1/*-
2 * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved.
3 * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
4 * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions are met:
8 *
9 * a) Redistributions of source code must retain the above copyright notice,
10 *    this list of conditions and the following disclaimer.
11 *
12 * b) Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in
14 *    the documentation and/or other materials provided with the distribution.
15 *
16 * c) Neither the name of Cisco Systems, Inc. nor the names of its
17 *    contributors may be used to endorse or promote products derived
18 *    from this software without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
22 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
24 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
30 * THE POSSIBILITY OF SUCH DAMAGE.
31 */
32
33#include <sys/cdefs.h>
34__FBSDID("$FreeBSD: stable/11/sys/netinet/sctp_output.c 364948 2020-08-29 06:55:10Z tuexen $");
35
36#include <netinet/sctp_os.h>
37#include <sys/proc.h>
38#include <netinet/sctp_var.h>
39#include <netinet/sctp_sysctl.h>
40#include <netinet/sctp_header.h>
41#include <netinet/sctp_pcb.h>
42#include <netinet/sctputil.h>
43#include <netinet/sctp_output.h>
44#include <netinet/sctp_uio.h>
45#include <netinet/sctputil.h>
46#include <netinet/sctp_auth.h>
47#include <netinet/sctp_timer.h>
48#include <netinet/sctp_asconf.h>
49#include <netinet/sctp_indata.h>
50#include <netinet/sctp_bsd_addr.h>
51#include <netinet/sctp_input.h>
52#include <netinet/sctp_crc32.h>
53#if defined(INET) || defined(INET6)
54#include <netinet/udp.h>
55#endif
56#include <netinet/udp_var.h>
57#include <machine/in_cksum.h>
58
59
60
61#define SCTP_MAX_GAPS_INARRAY 4
62struct sack_track {
63	uint8_t right_edge;	/* mergable on the right edge */
64	uint8_t left_edge;	/* mergable on the left edge */
65	uint8_t num_entries;
66	uint8_t spare;
67	struct sctp_gap_ack_block gaps[SCTP_MAX_GAPS_INARRAY];
68};
69
70const struct sack_track sack_array[256] = {
71	{0, 0, 0, 0,		/* 0x00 */
72		{{0, 0},
73		{0, 0},
74		{0, 0},
75		{0, 0}
76		}
77	},
78	{1, 0, 1, 0,		/* 0x01 */
79		{{0, 0},
80		{0, 0},
81		{0, 0},
82		{0, 0}
83		}
84	},
85	{0, 0, 1, 0,		/* 0x02 */
86		{{1, 1},
87		{0, 0},
88		{0, 0},
89		{0, 0}
90		}
91	},
92	{1, 0, 1, 0,		/* 0x03 */
93		{{0, 1},
94		{0, 0},
95		{0, 0},
96		{0, 0}
97		}
98	},
99	{0, 0, 1, 0,		/* 0x04 */
100		{{2, 2},
101		{0, 0},
102		{0, 0},
103		{0, 0}
104		}
105	},
106	{1, 0, 2, 0,		/* 0x05 */
107		{{0, 0},
108		{2, 2},
109		{0, 0},
110		{0, 0}
111		}
112	},
113	{0, 0, 1, 0,		/* 0x06 */
114		{{1, 2},
115		{0, 0},
116		{0, 0},
117		{0, 0}
118		}
119	},
120	{1, 0, 1, 0,		/* 0x07 */
121		{{0, 2},
122		{0, 0},
123		{0, 0},
124		{0, 0}
125		}
126	},
127	{0, 0, 1, 0,		/* 0x08 */
128		{{3, 3},
129		{0, 0},
130		{0, 0},
131		{0, 0}
132		}
133	},
134	{1, 0, 2, 0,		/* 0x09 */
135		{{0, 0},
136		{3, 3},
137		{0, 0},
138		{0, 0}
139		}
140	},
141	{0, 0, 2, 0,		/* 0x0a */
142		{{1, 1},
143		{3, 3},
144		{0, 0},
145		{0, 0}
146		}
147	},
148	{1, 0, 2, 0,		/* 0x0b */
149		{{0, 1},
150		{3, 3},
151		{0, 0},
152		{0, 0}
153		}
154	},
155	{0, 0, 1, 0,		/* 0x0c */
156		{{2, 3},
157		{0, 0},
158		{0, 0},
159		{0, 0}
160		}
161	},
162	{1, 0, 2, 0,		/* 0x0d */
163		{{0, 0},
164		{2, 3},
165		{0, 0},
166		{0, 0}
167		}
168	},
169	{0, 0, 1, 0,		/* 0x0e */
170		{{1, 3},
171		{0, 0},
172		{0, 0},
173		{0, 0}
174		}
175	},
176	{1, 0, 1, 0,		/* 0x0f */
177		{{0, 3},
178		{0, 0},
179		{0, 0},
180		{0, 0}
181		}
182	},
183	{0, 0, 1, 0,		/* 0x10 */
184		{{4, 4},
185		{0, 0},
186		{0, 0},
187		{0, 0}
188		}
189	},
190	{1, 0, 2, 0,		/* 0x11 */
191		{{0, 0},
192		{4, 4},
193		{0, 0},
194		{0, 0}
195		}
196	},
197	{0, 0, 2, 0,		/* 0x12 */
198		{{1, 1},
199		{4, 4},
200		{0, 0},
201		{0, 0}
202		}
203	},
204	{1, 0, 2, 0,		/* 0x13 */
205		{{0, 1},
206		{4, 4},
207		{0, 0},
208		{0, 0}
209		}
210	},
211	{0, 0, 2, 0,		/* 0x14 */
212		{{2, 2},
213		{4, 4},
214		{0, 0},
215		{0, 0}
216		}
217	},
218	{1, 0, 3, 0,		/* 0x15 */
219		{{0, 0},
220		{2, 2},
221		{4, 4},
222		{0, 0}
223		}
224	},
225	{0, 0, 2, 0,		/* 0x16 */
226		{{1, 2},
227		{4, 4},
228		{0, 0},
229		{0, 0}
230		}
231	},
232	{1, 0, 2, 0,		/* 0x17 */
233		{{0, 2},
234		{4, 4},
235		{0, 0},
236		{0, 0}
237		}
238	},
239	{0, 0, 1, 0,		/* 0x18 */
240		{{3, 4},
241		{0, 0},
242		{0, 0},
243		{0, 0}
244		}
245	},
246	{1, 0, 2, 0,		/* 0x19 */
247		{{0, 0},
248		{3, 4},
249		{0, 0},
250		{0, 0}
251		}
252	},
253	{0, 0, 2, 0,		/* 0x1a */
254		{{1, 1},
255		{3, 4},
256		{0, 0},
257		{0, 0}
258		}
259	},
260	{1, 0, 2, 0,		/* 0x1b */
261		{{0, 1},
262		{3, 4},
263		{0, 0},
264		{0, 0}
265		}
266	},
267	{0, 0, 1, 0,		/* 0x1c */
268		{{2, 4},
269		{0, 0},
270		{0, 0},
271		{0, 0}
272		}
273	},
274	{1, 0, 2, 0,		/* 0x1d */
275		{{0, 0},
276		{2, 4},
277		{0, 0},
278		{0, 0}
279		}
280	},
281	{0, 0, 1, 0,		/* 0x1e */
282		{{1, 4},
283		{0, 0},
284		{0, 0},
285		{0, 0}
286		}
287	},
288	{1, 0, 1, 0,		/* 0x1f */
289		{{0, 4},
290		{0, 0},
291		{0, 0},
292		{0, 0}
293		}
294	},
295	{0, 0, 1, 0,		/* 0x20 */
296		{{5, 5},
297		{0, 0},
298		{0, 0},
299		{0, 0}
300		}
301	},
302	{1, 0, 2, 0,		/* 0x21 */
303		{{0, 0},
304		{5, 5},
305		{0, 0},
306		{0, 0}
307		}
308	},
309	{0, 0, 2, 0,		/* 0x22 */
310		{{1, 1},
311		{5, 5},
312		{0, 0},
313		{0, 0}
314		}
315	},
316	{1, 0, 2, 0,		/* 0x23 */
317		{{0, 1},
318		{5, 5},
319		{0, 0},
320		{0, 0}
321		}
322	},
323	{0, 0, 2, 0,		/* 0x24 */
324		{{2, 2},
325		{5, 5},
326		{0, 0},
327		{0, 0}
328		}
329	},
330	{1, 0, 3, 0,		/* 0x25 */
331		{{0, 0},
332		{2, 2},
333		{5, 5},
334		{0, 0}
335		}
336	},
337	{0, 0, 2, 0,		/* 0x26 */
338		{{1, 2},
339		{5, 5},
340		{0, 0},
341		{0, 0}
342		}
343	},
344	{1, 0, 2, 0,		/* 0x27 */
345		{{0, 2},
346		{5, 5},
347		{0, 0},
348		{0, 0}
349		}
350	},
351	{0, 0, 2, 0,		/* 0x28 */
352		{{3, 3},
353		{5, 5},
354		{0, 0},
355		{0, 0}
356		}
357	},
358	{1, 0, 3, 0,		/* 0x29 */
359		{{0, 0},
360		{3, 3},
361		{5, 5},
362		{0, 0}
363		}
364	},
365	{0, 0, 3, 0,		/* 0x2a */
366		{{1, 1},
367		{3, 3},
368		{5, 5},
369		{0, 0}
370		}
371	},
372	{1, 0, 3, 0,		/* 0x2b */
373		{{0, 1},
374		{3, 3},
375		{5, 5},
376		{0, 0}
377		}
378	},
379	{0, 0, 2, 0,		/* 0x2c */
380		{{2, 3},
381		{5, 5},
382		{0, 0},
383		{0, 0}
384		}
385	},
386	{1, 0, 3, 0,		/* 0x2d */
387		{{0, 0},
388		{2, 3},
389		{5, 5},
390		{0, 0}
391		}
392	},
393	{0, 0, 2, 0,		/* 0x2e */
394		{{1, 3},
395		{5, 5},
396		{0, 0},
397		{0, 0}
398		}
399	},
400	{1, 0, 2, 0,		/* 0x2f */
401		{{0, 3},
402		{5, 5},
403		{0, 0},
404		{0, 0}
405		}
406	},
407	{0, 0, 1, 0,		/* 0x30 */
408		{{4, 5},
409		{0, 0},
410		{0, 0},
411		{0, 0}
412		}
413	},
414	{1, 0, 2, 0,		/* 0x31 */
415		{{0, 0},
416		{4, 5},
417		{0, 0},
418		{0, 0}
419		}
420	},
421	{0, 0, 2, 0,		/* 0x32 */
422		{{1, 1},
423		{4, 5},
424		{0, 0},
425		{0, 0}
426		}
427	},
428	{1, 0, 2, 0,		/* 0x33 */
429		{{0, 1},
430		{4, 5},
431		{0, 0},
432		{0, 0}
433		}
434	},
435	{0, 0, 2, 0,		/* 0x34 */
436		{{2, 2},
437		{4, 5},
438		{0, 0},
439		{0, 0}
440		}
441	},
442	{1, 0, 3, 0,		/* 0x35 */
443		{{0, 0},
444		{2, 2},
445		{4, 5},
446		{0, 0}
447		}
448	},
449	{0, 0, 2, 0,		/* 0x36 */
450		{{1, 2},
451		{4, 5},
452		{0, 0},
453		{0, 0}
454		}
455	},
456	{1, 0, 2, 0,		/* 0x37 */
457		{{0, 2},
458		{4, 5},
459		{0, 0},
460		{0, 0}
461		}
462	},
463	{0, 0, 1, 0,		/* 0x38 */
464		{{3, 5},
465		{0, 0},
466		{0, 0},
467		{0, 0}
468		}
469	},
470	{1, 0, 2, 0,		/* 0x39 */
471		{{0, 0},
472		{3, 5},
473		{0, 0},
474		{0, 0}
475		}
476	},
477	{0, 0, 2, 0,		/* 0x3a */
478		{{1, 1},
479		{3, 5},
480		{0, 0},
481		{0, 0}
482		}
483	},
484	{1, 0, 2, 0,		/* 0x3b */
485		{{0, 1},
486		{3, 5},
487		{0, 0},
488		{0, 0}
489		}
490	},
491	{0, 0, 1, 0,		/* 0x3c */
492		{{2, 5},
493		{0, 0},
494		{0, 0},
495		{0, 0}
496		}
497	},
498	{1, 0, 2, 0,		/* 0x3d */
499		{{0, 0},
500		{2, 5},
501		{0, 0},
502		{0, 0}
503		}
504	},
505	{0, 0, 1, 0,		/* 0x3e */
506		{{1, 5},
507		{0, 0},
508		{0, 0},
509		{0, 0}
510		}
511	},
512	{1, 0, 1, 0,		/* 0x3f */
513		{{0, 5},
514		{0, 0},
515		{0, 0},
516		{0, 0}
517		}
518	},
519	{0, 0, 1, 0,		/* 0x40 */
520		{{6, 6},
521		{0, 0},
522		{0, 0},
523		{0, 0}
524		}
525	},
526	{1, 0, 2, 0,		/* 0x41 */
527		{{0, 0},
528		{6, 6},
529		{0, 0},
530		{0, 0}
531		}
532	},
533	{0, 0, 2, 0,		/* 0x42 */
534		{{1, 1},
535		{6, 6},
536		{0, 0},
537		{0, 0}
538		}
539	},
540	{1, 0, 2, 0,		/* 0x43 */
541		{{0, 1},
542		{6, 6},
543		{0, 0},
544		{0, 0}
545		}
546	},
547	{0, 0, 2, 0,		/* 0x44 */
548		{{2, 2},
549		{6, 6},
550		{0, 0},
551		{0, 0}
552		}
553	},
554	{1, 0, 3, 0,		/* 0x45 */
555		{{0, 0},
556		{2, 2},
557		{6, 6},
558		{0, 0}
559		}
560	},
561	{0, 0, 2, 0,		/* 0x46 */
562		{{1, 2},
563		{6, 6},
564		{0, 0},
565		{0, 0}
566		}
567	},
568	{1, 0, 2, 0,		/* 0x47 */
569		{{0, 2},
570		{6, 6},
571		{0, 0},
572		{0, 0}
573		}
574	},
575	{0, 0, 2, 0,		/* 0x48 */
576		{{3, 3},
577		{6, 6},
578		{0, 0},
579		{0, 0}
580		}
581	},
582	{1, 0, 3, 0,		/* 0x49 */
583		{{0, 0},
584		{3, 3},
585		{6, 6},
586		{0, 0}
587		}
588	},
589	{0, 0, 3, 0,		/* 0x4a */
590		{{1, 1},
591		{3, 3},
592		{6, 6},
593		{0, 0}
594		}
595	},
596	{1, 0, 3, 0,		/* 0x4b */
597		{{0, 1},
598		{3, 3},
599		{6, 6},
600		{0, 0}
601		}
602	},
603	{0, 0, 2, 0,		/* 0x4c */
604		{{2, 3},
605		{6, 6},
606		{0, 0},
607		{0, 0}
608		}
609	},
610	{1, 0, 3, 0,		/* 0x4d */
611		{{0, 0},
612		{2, 3},
613		{6, 6},
614		{0, 0}
615		}
616	},
617	{0, 0, 2, 0,		/* 0x4e */
618		{{1, 3},
619		{6, 6},
620		{0, 0},
621		{0, 0}
622		}
623	},
624	{1, 0, 2, 0,		/* 0x4f */
625		{{0, 3},
626		{6, 6},
627		{0, 0},
628		{0, 0}
629		}
630	},
631	{0, 0, 2, 0,		/* 0x50 */
632		{{4, 4},
633		{6, 6},
634		{0, 0},
635		{0, 0}
636		}
637	},
638	{1, 0, 3, 0,		/* 0x51 */
639		{{0, 0},
640		{4, 4},
641		{6, 6},
642		{0, 0}
643		}
644	},
645	{0, 0, 3, 0,		/* 0x52 */
646		{{1, 1},
647		{4, 4},
648		{6, 6},
649		{0, 0}
650		}
651	},
652	{1, 0, 3, 0,		/* 0x53 */
653		{{0, 1},
654		{4, 4},
655		{6, 6},
656		{0, 0}
657		}
658	},
659	{0, 0, 3, 0,		/* 0x54 */
660		{{2, 2},
661		{4, 4},
662		{6, 6},
663		{0, 0}
664		}
665	},
666	{1, 0, 4, 0,		/* 0x55 */
667		{{0, 0},
668		{2, 2},
669		{4, 4},
670		{6, 6}
671		}
672	},
673	{0, 0, 3, 0,		/* 0x56 */
674		{{1, 2},
675		{4, 4},
676		{6, 6},
677		{0, 0}
678		}
679	},
680	{1, 0, 3, 0,		/* 0x57 */
681		{{0, 2},
682		{4, 4},
683		{6, 6},
684		{0, 0}
685		}
686	},
687	{0, 0, 2, 0,		/* 0x58 */
688		{{3, 4},
689		{6, 6},
690		{0, 0},
691		{0, 0}
692		}
693	},
694	{1, 0, 3, 0,		/* 0x59 */
695		{{0, 0},
696		{3, 4},
697		{6, 6},
698		{0, 0}
699		}
700	},
701	{0, 0, 3, 0,		/* 0x5a */
702		{{1, 1},
703		{3, 4},
704		{6, 6},
705		{0, 0}
706		}
707	},
708	{1, 0, 3, 0,		/* 0x5b */
709		{{0, 1},
710		{3, 4},
711		{6, 6},
712		{0, 0}
713		}
714	},
715	{0, 0, 2, 0,		/* 0x5c */
716		{{2, 4},
717		{6, 6},
718		{0, 0},
719		{0, 0}
720		}
721	},
722	{1, 0, 3, 0,		/* 0x5d */
723		{{0, 0},
724		{2, 4},
725		{6, 6},
726		{0, 0}
727		}
728	},
729	{0, 0, 2, 0,		/* 0x5e */
730		{{1, 4},
731		{6, 6},
732		{0, 0},
733		{0, 0}
734		}
735	},
736	{1, 0, 2, 0,		/* 0x5f */
737		{{0, 4},
738		{6, 6},
739		{0, 0},
740		{0, 0}
741		}
742	},
743	{0, 0, 1, 0,		/* 0x60 */
744		{{5, 6},
745		{0, 0},
746		{0, 0},
747		{0, 0}
748		}
749	},
750	{1, 0, 2, 0,		/* 0x61 */
751		{{0, 0},
752		{5, 6},
753		{0, 0},
754		{0, 0}
755		}
756	},
757	{0, 0, 2, 0,		/* 0x62 */
758		{{1, 1},
759		{5, 6},
760		{0, 0},
761		{0, 0}
762		}
763	},
764	{1, 0, 2, 0,		/* 0x63 */
765		{{0, 1},
766		{5, 6},
767		{0, 0},
768		{0, 0}
769		}
770	},
771	{0, 0, 2, 0,		/* 0x64 */
772		{{2, 2},
773		{5, 6},
774		{0, 0},
775		{0, 0}
776		}
777	},
778	{1, 0, 3, 0,		/* 0x65 */
779		{{0, 0},
780		{2, 2},
781		{5, 6},
782		{0, 0}
783		}
784	},
785	{0, 0, 2, 0,		/* 0x66 */
786		{{1, 2},
787		{5, 6},
788		{0, 0},
789		{0, 0}
790		}
791	},
792	{1, 0, 2, 0,		/* 0x67 */
793		{{0, 2},
794		{5, 6},
795		{0, 0},
796		{0, 0}
797		}
798	},
799	{0, 0, 2, 0,		/* 0x68 */
800		{{3, 3},
801		{5, 6},
802		{0, 0},
803		{0, 0}
804		}
805	},
806	{1, 0, 3, 0,		/* 0x69 */
807		{{0, 0},
808		{3, 3},
809		{5, 6},
810		{0, 0}
811		}
812	},
813	{0, 0, 3, 0,		/* 0x6a */
814		{{1, 1},
815		{3, 3},
816		{5, 6},
817		{0, 0}
818		}
819	},
820	{1, 0, 3, 0,		/* 0x6b */
821		{{0, 1},
822		{3, 3},
823		{5, 6},
824		{0, 0}
825		}
826	},
827	{0, 0, 2, 0,		/* 0x6c */
828		{{2, 3},
829		{5, 6},
830		{0, 0},
831		{0, 0}
832		}
833	},
834	{1, 0, 3, 0,		/* 0x6d */
835		{{0, 0},
836		{2, 3},
837		{5, 6},
838		{0, 0}
839		}
840	},
841	{0, 0, 2, 0,		/* 0x6e */
842		{{1, 3},
843		{5, 6},
844		{0, 0},
845		{0, 0}
846		}
847	},
848	{1, 0, 2, 0,		/* 0x6f */
849		{{0, 3},
850		{5, 6},
851		{0, 0},
852		{0, 0}
853		}
854	},
855	{0, 0, 1, 0,		/* 0x70 */
856		{{4, 6},
857		{0, 0},
858		{0, 0},
859		{0, 0}
860		}
861	},
862	{1, 0, 2, 0,		/* 0x71 */
863		{{0, 0},
864		{4, 6},
865		{0, 0},
866		{0, 0}
867		}
868	},
869	{0, 0, 2, 0,		/* 0x72 */
870		{{1, 1},
871		{4, 6},
872		{0, 0},
873		{0, 0}
874		}
875	},
876	{1, 0, 2, 0,		/* 0x73 */
877		{{0, 1},
878		{4, 6},
879		{0, 0},
880		{0, 0}
881		}
882	},
883	{0, 0, 2, 0,		/* 0x74 */
884		{{2, 2},
885		{4, 6},
886		{0, 0},
887		{0, 0}
888		}
889	},
890	{1, 0, 3, 0,		/* 0x75 */
891		{{0, 0},
892		{2, 2},
893		{4, 6},
894		{0, 0}
895		}
896	},
897	{0, 0, 2, 0,		/* 0x76 */
898		{{1, 2},
899		{4, 6},
900		{0, 0},
901		{0, 0}
902		}
903	},
904	{1, 0, 2, 0,		/* 0x77 */
905		{{0, 2},
906		{4, 6},
907		{0, 0},
908		{0, 0}
909		}
910	},
911	{0, 0, 1, 0,		/* 0x78 */
912		{{3, 6},
913		{0, 0},
914		{0, 0},
915		{0, 0}
916		}
917	},
918	{1, 0, 2, 0,		/* 0x79 */
919		{{0, 0},
920		{3, 6},
921		{0, 0},
922		{0, 0}
923		}
924	},
925	{0, 0, 2, 0,		/* 0x7a */
926		{{1, 1},
927		{3, 6},
928		{0, 0},
929		{0, 0}
930		}
931	},
932	{1, 0, 2, 0,		/* 0x7b */
933		{{0, 1},
934		{3, 6},
935		{0, 0},
936		{0, 0}
937		}
938	},
939	{0, 0, 1, 0,		/* 0x7c */
940		{{2, 6},
941		{0, 0},
942		{0, 0},
943		{0, 0}
944		}
945	},
946	{1, 0, 2, 0,		/* 0x7d */
947		{{0, 0},
948		{2, 6},
949		{0, 0},
950		{0, 0}
951		}
952	},
953	{0, 0, 1, 0,		/* 0x7e */
954		{{1, 6},
955		{0, 0},
956		{0, 0},
957		{0, 0}
958		}
959	},
960	{1, 0, 1, 0,		/* 0x7f */
961		{{0, 6},
962		{0, 0},
963		{0, 0},
964		{0, 0}
965		}
966	},
967	{0, 1, 1, 0,		/* 0x80 */
968		{{7, 7},
969		{0, 0},
970		{0, 0},
971		{0, 0}
972		}
973	},
974	{1, 1, 2, 0,		/* 0x81 */
975		{{0, 0},
976		{7, 7},
977		{0, 0},
978		{0, 0}
979		}
980	},
981	{0, 1, 2, 0,		/* 0x82 */
982		{{1, 1},
983		{7, 7},
984		{0, 0},
985		{0, 0}
986		}
987	},
988	{1, 1, 2, 0,		/* 0x83 */
989		{{0, 1},
990		{7, 7},
991		{0, 0},
992		{0, 0}
993		}
994	},
995	{0, 1, 2, 0,		/* 0x84 */
996		{{2, 2},
997		{7, 7},
998		{0, 0},
999		{0, 0}
1000		}
1001	},
1002	{1, 1, 3, 0,		/* 0x85 */
1003		{{0, 0},
1004		{2, 2},
1005		{7, 7},
1006		{0, 0}
1007		}
1008	},
1009	{0, 1, 2, 0,		/* 0x86 */
1010		{{1, 2},
1011		{7, 7},
1012		{0, 0},
1013		{0, 0}
1014		}
1015	},
1016	{1, 1, 2, 0,		/* 0x87 */
1017		{{0, 2},
1018		{7, 7},
1019		{0, 0},
1020		{0, 0}
1021		}
1022	},
1023	{0, 1, 2, 0,		/* 0x88 */
1024		{{3, 3},
1025		{7, 7},
1026		{0, 0},
1027		{0, 0}
1028		}
1029	},
1030	{1, 1, 3, 0,		/* 0x89 */
1031		{{0, 0},
1032		{3, 3},
1033		{7, 7},
1034		{0, 0}
1035		}
1036	},
1037	{0, 1, 3, 0,		/* 0x8a */
1038		{{1, 1},
1039		{3, 3},
1040		{7, 7},
1041		{0, 0}
1042		}
1043	},
1044	{1, 1, 3, 0,		/* 0x8b */
1045		{{0, 1},
1046		{3, 3},
1047		{7, 7},
1048		{0, 0}
1049		}
1050	},
1051	{0, 1, 2, 0,		/* 0x8c */
1052		{{2, 3},
1053		{7, 7},
1054		{0, 0},
1055		{0, 0}
1056		}
1057	},
1058	{1, 1, 3, 0,		/* 0x8d */
1059		{{0, 0},
1060		{2, 3},
1061		{7, 7},
1062		{0, 0}
1063		}
1064	},
1065	{0, 1, 2, 0,		/* 0x8e */
1066		{{1, 3},
1067		{7, 7},
1068		{0, 0},
1069		{0, 0}
1070		}
1071	},
1072	{1, 1, 2, 0,		/* 0x8f */
1073		{{0, 3},
1074		{7, 7},
1075		{0, 0},
1076		{0, 0}
1077		}
1078	},
1079	{0, 1, 2, 0,		/* 0x90 */
1080		{{4, 4},
1081		{7, 7},
1082		{0, 0},
1083		{0, 0}
1084		}
1085	},
1086	{1, 1, 3, 0,		/* 0x91 */
1087		{{0, 0},
1088		{4, 4},
1089		{7, 7},
1090		{0, 0}
1091		}
1092	},
1093	{0, 1, 3, 0,		/* 0x92 */
1094		{{1, 1},
1095		{4, 4},
1096		{7, 7},
1097		{0, 0}
1098		}
1099	},
1100	{1, 1, 3, 0,		/* 0x93 */
1101		{{0, 1},
1102		{4, 4},
1103		{7, 7},
1104		{0, 0}
1105		}
1106	},
1107	{0, 1, 3, 0,		/* 0x94 */
1108		{{2, 2},
1109		{4, 4},
1110		{7, 7},
1111		{0, 0}
1112		}
1113	},
1114	{1, 1, 4, 0,		/* 0x95 */
1115		{{0, 0},
1116		{2, 2},
1117		{4, 4},
1118		{7, 7}
1119		}
1120	},
1121	{0, 1, 3, 0,		/* 0x96 */
1122		{{1, 2},
1123		{4, 4},
1124		{7, 7},
1125		{0, 0}
1126		}
1127	},
1128	{1, 1, 3, 0,		/* 0x97 */
1129		{{0, 2},
1130		{4, 4},
1131		{7, 7},
1132		{0, 0}
1133		}
1134	},
1135	{0, 1, 2, 0,		/* 0x98 */
1136		{{3, 4},
1137		{7, 7},
1138		{0, 0},
1139		{0, 0}
1140		}
1141	},
1142	{1, 1, 3, 0,		/* 0x99 */
1143		{{0, 0},
1144		{3, 4},
1145		{7, 7},
1146		{0, 0}
1147		}
1148	},
1149	{0, 1, 3, 0,		/* 0x9a */
1150		{{1, 1},
1151		{3, 4},
1152		{7, 7},
1153		{0, 0}
1154		}
1155	},
1156	{1, 1, 3, 0,		/* 0x9b */
1157		{{0, 1},
1158		{3, 4},
1159		{7, 7},
1160		{0, 0}
1161		}
1162	},
1163	{0, 1, 2, 0,		/* 0x9c */
1164		{{2, 4},
1165		{7, 7},
1166		{0, 0},
1167		{0, 0}
1168		}
1169	},
1170	{1, 1, 3, 0,		/* 0x9d */
1171		{{0, 0},
1172		{2, 4},
1173		{7, 7},
1174		{0, 0}
1175		}
1176	},
1177	{0, 1, 2, 0,		/* 0x9e */
1178		{{1, 4},
1179		{7, 7},
1180		{0, 0},
1181		{0, 0}
1182		}
1183	},
1184	{1, 1, 2, 0,		/* 0x9f */
1185		{{0, 4},
1186		{7, 7},
1187		{0, 0},
1188		{0, 0}
1189		}
1190	},
1191	{0, 1, 2, 0,		/* 0xa0 */
1192		{{5, 5},
1193		{7, 7},
1194		{0, 0},
1195		{0, 0}
1196		}
1197	},
1198	{1, 1, 3, 0,		/* 0xa1 */
1199		{{0, 0},
1200		{5, 5},
1201		{7, 7},
1202		{0, 0}
1203		}
1204	},
1205	{0, 1, 3, 0,		/* 0xa2 */
1206		{{1, 1},
1207		{5, 5},
1208		{7, 7},
1209		{0, 0}
1210		}
1211	},
1212	{1, 1, 3, 0,		/* 0xa3 */
1213		{{0, 1},
1214		{5, 5},
1215		{7, 7},
1216		{0, 0}
1217		}
1218	},
1219	{0, 1, 3, 0,		/* 0xa4 */
1220		{{2, 2},
1221		{5, 5},
1222		{7, 7},
1223		{0, 0}
1224		}
1225	},
1226	{1, 1, 4, 0,		/* 0xa5 */
1227		{{0, 0},
1228		{2, 2},
1229		{5, 5},
1230		{7, 7}
1231		}
1232	},
1233	{0, 1, 3, 0,		/* 0xa6 */
1234		{{1, 2},
1235		{5, 5},
1236		{7, 7},
1237		{0, 0}
1238		}
1239	},
1240	{1, 1, 3, 0,		/* 0xa7 */
1241		{{0, 2},
1242		{5, 5},
1243		{7, 7},
1244		{0, 0}
1245		}
1246	},
1247	{0, 1, 3, 0,		/* 0xa8 */
1248		{{3, 3},
1249		{5, 5},
1250		{7, 7},
1251		{0, 0}
1252		}
1253	},
1254	{1, 1, 4, 0,		/* 0xa9 */
1255		{{0, 0},
1256		{3, 3},
1257		{5, 5},
1258		{7, 7}
1259		}
1260	},
1261	{0, 1, 4, 0,		/* 0xaa */
1262		{{1, 1},
1263		{3, 3},
1264		{5, 5},
1265		{7, 7}
1266		}
1267	},
1268	{1, 1, 4, 0,		/* 0xab */
1269		{{0, 1},
1270		{3, 3},
1271		{5, 5},
1272		{7, 7}
1273		}
1274	},
1275	{0, 1, 3, 0,		/* 0xac */
1276		{{2, 3},
1277		{5, 5},
1278		{7, 7},
1279		{0, 0}
1280		}
1281	},
1282	{1, 1, 4, 0,		/* 0xad */
1283		{{0, 0},
1284		{2, 3},
1285		{5, 5},
1286		{7, 7}
1287		}
1288	},
1289	{0, 1, 3, 0,		/* 0xae */
1290		{{1, 3},
1291		{5, 5},
1292		{7, 7},
1293		{0, 0}
1294		}
1295	},
1296	{1, 1, 3, 0,		/* 0xaf */
1297		{{0, 3},
1298		{5, 5},
1299		{7, 7},
1300		{0, 0}
1301		}
1302	},
1303	{0, 1, 2, 0,		/* 0xb0 */
1304		{{4, 5},
1305		{7, 7},
1306		{0, 0},
1307		{0, 0}
1308		}
1309	},
1310	{1, 1, 3, 0,		/* 0xb1 */
1311		{{0, 0},
1312		{4, 5},
1313		{7, 7},
1314		{0, 0}
1315		}
1316	},
1317	{0, 1, 3, 0,		/* 0xb2 */
1318		{{1, 1},
1319		{4, 5},
1320		{7, 7},
1321		{0, 0}
1322		}
1323	},
1324	{1, 1, 3, 0,		/* 0xb3 */
1325		{{0, 1},
1326		{4, 5},
1327		{7, 7},
1328		{0, 0}
1329		}
1330	},
1331	{0, 1, 3, 0,		/* 0xb4 */
1332		{{2, 2},
1333		{4, 5},
1334		{7, 7},
1335		{0, 0}
1336		}
1337	},
1338	{1, 1, 4, 0,		/* 0xb5 */
1339		{{0, 0},
1340		{2, 2},
1341		{4, 5},
1342		{7, 7}
1343		}
1344	},
1345	{0, 1, 3, 0,		/* 0xb6 */
1346		{{1, 2},
1347		{4, 5},
1348		{7, 7},
1349		{0, 0}
1350		}
1351	},
1352	{1, 1, 3, 0,		/* 0xb7 */
1353		{{0, 2},
1354		{4, 5},
1355		{7, 7},
1356		{0, 0}
1357		}
1358	},
1359	{0, 1, 2, 0,		/* 0xb8 */
1360		{{3, 5},
1361		{7, 7},
1362		{0, 0},
1363		{0, 0}
1364		}
1365	},
1366	{1, 1, 3, 0,		/* 0xb9 */
1367		{{0, 0},
1368		{3, 5},
1369		{7, 7},
1370		{0, 0}
1371		}
1372	},
1373	{0, 1, 3, 0,		/* 0xba */
1374		{{1, 1},
1375		{3, 5},
1376		{7, 7},
1377		{0, 0}
1378		}
1379	},
1380	{1, 1, 3, 0,		/* 0xbb */
1381		{{0, 1},
1382		{3, 5},
1383		{7, 7},
1384		{0, 0}
1385		}
1386	},
1387	{0, 1, 2, 0,		/* 0xbc */
1388		{{2, 5},
1389		{7, 7},
1390		{0, 0},
1391		{0, 0}
1392		}
1393	},
1394	{1, 1, 3, 0,		/* 0xbd */
1395		{{0, 0},
1396		{2, 5},
1397		{7, 7},
1398		{0, 0}
1399		}
1400	},
1401	{0, 1, 2, 0,		/* 0xbe */
1402		{{1, 5},
1403		{7, 7},
1404		{0, 0},
1405		{0, 0}
1406		}
1407	},
1408	{1, 1, 2, 0,		/* 0xbf */
1409		{{0, 5},
1410		{7, 7},
1411		{0, 0},
1412		{0, 0}
1413		}
1414	},
1415	{0, 1, 1, 0,		/* 0xc0 */
1416		{{6, 7},
1417		{0, 0},
1418		{0, 0},
1419		{0, 0}
1420		}
1421	},
1422	{1, 1, 2, 0,		/* 0xc1 */
1423		{{0, 0},
1424		{6, 7},
1425		{0, 0},
1426		{0, 0}
1427		}
1428	},
1429	{0, 1, 2, 0,		/* 0xc2 */
1430		{{1, 1},
1431		{6, 7},
1432		{0, 0},
1433		{0, 0}
1434		}
1435	},
1436	{1, 1, 2, 0,		/* 0xc3 */
1437		{{0, 1},
1438		{6, 7},
1439		{0, 0},
1440		{0, 0}
1441		}
1442	},
1443	{0, 1, 2, 0,		/* 0xc4 */
1444		{{2, 2},
1445		{6, 7},
1446		{0, 0},
1447		{0, 0}
1448		}
1449	},
1450	{1, 1, 3, 0,		/* 0xc5 */
1451		{{0, 0},
1452		{2, 2},
1453		{6, 7},
1454		{0, 0}
1455		}
1456	},
1457	{0, 1, 2, 0,		/* 0xc6 */
1458		{{1, 2},
1459		{6, 7},
1460		{0, 0},
1461		{0, 0}
1462		}
1463	},
1464	{1, 1, 2, 0,		/* 0xc7 */
1465		{{0, 2},
1466		{6, 7},
1467		{0, 0},
1468		{0, 0}
1469		}
1470	},
1471	{0, 1, 2, 0,		/* 0xc8 */
1472		{{3, 3},
1473		{6, 7},
1474		{0, 0},
1475		{0, 0}
1476		}
1477	},
1478	{1, 1, 3, 0,		/* 0xc9 */
1479		{{0, 0},
1480		{3, 3},
1481		{6, 7},
1482		{0, 0}
1483		}
1484	},
1485	{0, 1, 3, 0,		/* 0xca */
1486		{{1, 1},
1487		{3, 3},
1488		{6, 7},
1489		{0, 0}
1490		}
1491	},
1492	{1, 1, 3, 0,		/* 0xcb */
1493		{{0, 1},
1494		{3, 3},
1495		{6, 7},
1496		{0, 0}
1497		}
1498	},
1499	{0, 1, 2, 0,		/* 0xcc */
1500		{{2, 3},
1501		{6, 7},
1502		{0, 0},
1503		{0, 0}
1504		}
1505	},
1506	{1, 1, 3, 0,		/* 0xcd */
1507		{{0, 0},
1508		{2, 3},
1509		{6, 7},
1510		{0, 0}
1511		}
1512	},
1513	{0, 1, 2, 0,		/* 0xce */
1514		{{1, 3},
1515		{6, 7},
1516		{0, 0},
1517		{0, 0}
1518		}
1519	},
1520	{1, 1, 2, 0,		/* 0xcf */
1521		{{0, 3},
1522		{6, 7},
1523		{0, 0},
1524		{0, 0}
1525		}
1526	},
1527	{0, 1, 2, 0,		/* 0xd0 */
1528		{{4, 4},
1529		{6, 7},
1530		{0, 0},
1531		{0, 0}
1532		}
1533	},
1534	{1, 1, 3, 0,		/* 0xd1 */
1535		{{0, 0},
1536		{4, 4},
1537		{6, 7},
1538		{0, 0}
1539		}
1540	},
1541	{0, 1, 3, 0,		/* 0xd2 */
1542		{{1, 1},
1543		{4, 4},
1544		{6, 7},
1545		{0, 0}
1546		}
1547	},
1548	{1, 1, 3, 0,		/* 0xd3 */
1549		{{0, 1},
1550		{4, 4},
1551		{6, 7},
1552		{0, 0}
1553		}
1554	},
1555	{0, 1, 3, 0,		/* 0xd4 */
1556		{{2, 2},
1557		{4, 4},
1558		{6, 7},
1559		{0, 0}
1560		}
1561	},
1562	{1, 1, 4, 0,		/* 0xd5 */
1563		{{0, 0},
1564		{2, 2},
1565		{4, 4},
1566		{6, 7}
1567		}
1568	},
1569	{0, 1, 3, 0,		/* 0xd6 */
1570		{{1, 2},
1571		{4, 4},
1572		{6, 7},
1573		{0, 0}
1574		}
1575	},
1576	{1, 1, 3, 0,		/* 0xd7 */
1577		{{0, 2},
1578		{4, 4},
1579		{6, 7},
1580		{0, 0}
1581		}
1582	},
1583	{0, 1, 2, 0,		/* 0xd8 */
1584		{{3, 4},
1585		{6, 7},
1586		{0, 0},
1587		{0, 0}
1588		}
1589	},
1590	{1, 1, 3, 0,		/* 0xd9 */
1591		{{0, 0},
1592		{3, 4},
1593		{6, 7},
1594		{0, 0}
1595		}
1596	},
1597	{0, 1, 3, 0,		/* 0xda */
1598		{{1, 1},
1599		{3, 4},
1600		{6, 7},
1601		{0, 0}
1602		}
1603	},
1604	{1, 1, 3, 0,		/* 0xdb */
1605		{{0, 1},
1606		{3, 4},
1607		{6, 7},
1608		{0, 0}
1609		}
1610	},
1611	{0, 1, 2, 0,		/* 0xdc */
1612		{{2, 4},
1613		{6, 7},
1614		{0, 0},
1615		{0, 0}
1616		}
1617	},
1618	{1, 1, 3, 0,		/* 0xdd */
1619		{{0, 0},
1620		{2, 4},
1621		{6, 7},
1622		{0, 0}
1623		}
1624	},
1625	{0, 1, 2, 0,		/* 0xde */
1626		{{1, 4},
1627		{6, 7},
1628		{0, 0},
1629		{0, 0}
1630		}
1631	},
1632	{1, 1, 2, 0,		/* 0xdf */
1633		{{0, 4},
1634		{6, 7},
1635		{0, 0},
1636		{0, 0}
1637		}
1638	},
1639	{0, 1, 1, 0,		/* 0xe0 */
1640		{{5, 7},
1641		{0, 0},
1642		{0, 0},
1643		{0, 0}
1644		}
1645	},
1646	{1, 1, 2, 0,		/* 0xe1 */
1647		{{0, 0},
1648		{5, 7},
1649		{0, 0},
1650		{0, 0}
1651		}
1652	},
1653	{0, 1, 2, 0,		/* 0xe2 */
1654		{{1, 1},
1655		{5, 7},
1656		{0, 0},
1657		{0, 0}
1658		}
1659	},
1660	{1, 1, 2, 0,		/* 0xe3 */
1661		{{0, 1},
1662		{5, 7},
1663		{0, 0},
1664		{0, 0}
1665		}
1666	},
1667	{0, 1, 2, 0,		/* 0xe4 */
1668		{{2, 2},
1669		{5, 7},
1670		{0, 0},
1671		{0, 0}
1672		}
1673	},
1674	{1, 1, 3, 0,		/* 0xe5 */
1675		{{0, 0},
1676		{2, 2},
1677		{5, 7},
1678		{0, 0}
1679		}
1680	},
1681	{0, 1, 2, 0,		/* 0xe6 */
1682		{{1, 2},
1683		{5, 7},
1684		{0, 0},
1685		{0, 0}
1686		}
1687	},
1688	{1, 1, 2, 0,		/* 0xe7 */
1689		{{0, 2},
1690		{5, 7},
1691		{0, 0},
1692		{0, 0}
1693		}
1694	},
1695	{0, 1, 2, 0,		/* 0xe8 */
1696		{{3, 3},
1697		{5, 7},
1698		{0, 0},
1699		{0, 0}
1700		}
1701	},
1702	{1, 1, 3, 0,		/* 0xe9 */
1703		{{0, 0},
1704		{3, 3},
1705		{5, 7},
1706		{0, 0}
1707		}
1708	},
1709	{0, 1, 3, 0,		/* 0xea */
1710		{{1, 1},
1711		{3, 3},
1712		{5, 7},
1713		{0, 0}
1714		}
1715	},
1716	{1, 1, 3, 0,		/* 0xeb */
1717		{{0, 1},
1718		{3, 3},
1719		{5, 7},
1720		{0, 0}
1721		}
1722	},
1723	{0, 1, 2, 0,		/* 0xec */
1724		{{2, 3},
1725		{5, 7},
1726		{0, 0},
1727		{0, 0}
1728		}
1729	},
1730	{1, 1, 3, 0,		/* 0xed */
1731		{{0, 0},
1732		{2, 3},
1733		{5, 7},
1734		{0, 0}
1735		}
1736	},
1737	{0, 1, 2, 0,		/* 0xee */
1738		{{1, 3},
1739		{5, 7},
1740		{0, 0},
1741		{0, 0}
1742		}
1743	},
1744	{1, 1, 2, 0,		/* 0xef */
1745		{{0, 3},
1746		{5, 7},
1747		{0, 0},
1748		{0, 0}
1749		}
1750	},
1751	{0, 1, 1, 0,		/* 0xf0 */
1752		{{4, 7},
1753		{0, 0},
1754		{0, 0},
1755		{0, 0}
1756		}
1757	},
1758	{1, 1, 2, 0,		/* 0xf1 */
1759		{{0, 0},
1760		{4, 7},
1761		{0, 0},
1762		{0, 0}
1763		}
1764	},
1765	{0, 1, 2, 0,		/* 0xf2 */
1766		{{1, 1},
1767		{4, 7},
1768		{0, 0},
1769		{0, 0}
1770		}
1771	},
1772	{1, 1, 2, 0,		/* 0xf3 */
1773		{{0, 1},
1774		{4, 7},
1775		{0, 0},
1776		{0, 0}
1777		}
1778	},
1779	{0, 1, 2, 0,		/* 0xf4 */
1780		{{2, 2},
1781		{4, 7},
1782		{0, 0},
1783		{0, 0}
1784		}
1785	},
1786	{1, 1, 3, 0,		/* 0xf5 */
1787		{{0, 0},
1788		{2, 2},
1789		{4, 7},
1790		{0, 0}
1791		}
1792	},
1793	{0, 1, 2, 0,		/* 0xf6 */
1794		{{1, 2},
1795		{4, 7},
1796		{0, 0},
1797		{0, 0}
1798		}
1799	},
1800	{1, 1, 2, 0,		/* 0xf7 */
1801		{{0, 2},
1802		{4, 7},
1803		{0, 0},
1804		{0, 0}
1805		}
1806	},
1807	{0, 1, 1, 0,		/* 0xf8 */
1808		{{3, 7},
1809		{0, 0},
1810		{0, 0},
1811		{0, 0}
1812		}
1813	},
1814	{1, 1, 2, 0,		/* 0xf9 */
1815		{{0, 0},
1816		{3, 7},
1817		{0, 0},
1818		{0, 0}
1819		}
1820	},
1821	{0, 1, 2, 0,		/* 0xfa */
1822		{{1, 1},
1823		{3, 7},
1824		{0, 0},
1825		{0, 0}
1826		}
1827	},
1828	{1, 1, 2, 0,		/* 0xfb */
1829		{{0, 1},
1830		{3, 7},
1831		{0, 0},
1832		{0, 0}
1833		}
1834	},
1835	{0, 1, 1, 0,		/* 0xfc */
1836		{{2, 7},
1837		{0, 0},
1838		{0, 0},
1839		{0, 0}
1840		}
1841	},
1842	{1, 1, 2, 0,		/* 0xfd */
1843		{{0, 0},
1844		{2, 7},
1845		{0, 0},
1846		{0, 0}
1847		}
1848	},
1849	{0, 1, 1, 0,		/* 0xfe */
1850		{{1, 7},
1851		{0, 0},
1852		{0, 0},
1853		{0, 0}
1854		}
1855	},
1856	{1, 1, 1, 0,		/* 0xff */
1857		{{0, 7},
1858		{0, 0},
1859		{0, 0},
1860		{0, 0}
1861		}
1862	}
1863};
1864
1865
1866int
1867sctp_is_address_in_scope(struct sctp_ifa *ifa,
1868    struct sctp_scoping *scope,
1869    int do_update)
1870{
1871	if ((scope->loopback_scope == 0) &&
1872	    (ifa->ifn_p) && SCTP_IFN_IS_IFT_LOOP(ifa->ifn_p)) {
1873		/*
1874		 * skip loopback if not in scope *
1875		 */
1876		return (0);
1877	}
1878	switch (ifa->address.sa.sa_family) {
1879#ifdef INET
1880	case AF_INET:
1881		if (scope->ipv4_addr_legal) {
1882			struct sockaddr_in *sin;
1883
1884			sin = &ifa->address.sin;
1885			if (sin->sin_addr.s_addr == 0) {
1886				/* not in scope , unspecified */
1887				return (0);
1888			}
1889			if ((scope->ipv4_local_scope == 0) &&
1890			    (IN4_ISPRIVATE_ADDRESS(&sin->sin_addr))) {
1891				/* private address not in scope */
1892				return (0);
1893			}
1894		} else {
1895			return (0);
1896		}
1897		break;
1898#endif
1899#ifdef INET6
1900	case AF_INET6:
1901		if (scope->ipv6_addr_legal) {
1902			struct sockaddr_in6 *sin6;
1903
1904			/*
1905			 * Must update the flags,  bummer, which means any
1906			 * IFA locks must now be applied HERE <->
1907			 */
1908			if (do_update) {
1909				sctp_gather_internal_ifa_flags(ifa);
1910			}
1911			if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
1912				return (0);
1913			}
1914			/* ok to use deprecated addresses? */
1915			sin6 = &ifa->address.sin6;
1916			if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1917				/* skip unspecifed addresses */
1918				return (0);
1919			}
1920			if (	/* (local_scope == 0) && */
1921			    (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))) {
1922				return (0);
1923			}
1924			if ((scope->site_scope == 0) &&
1925			    (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr))) {
1926				return (0);
1927			}
1928		} else {
1929			return (0);
1930		}
1931		break;
1932#endif
1933	default:
1934		return (0);
1935	}
1936	return (1);
1937}
1938
1939static struct mbuf *
1940sctp_add_addr_to_mbuf(struct mbuf *m, struct sctp_ifa *ifa, uint16_t *len)
1941{
1942#if defined(INET) || defined(INET6)
1943	struct sctp_paramhdr *paramh;
1944	struct mbuf *mret;
1945	uint16_t plen;
1946#endif
1947
1948	switch (ifa->address.sa.sa_family) {
1949#ifdef INET
1950	case AF_INET:
1951		plen = (uint16_t)sizeof(struct sctp_ipv4addr_param);
1952		break;
1953#endif
1954#ifdef INET6
1955	case AF_INET6:
1956		plen = (uint16_t)sizeof(struct sctp_ipv6addr_param);
1957		break;
1958#endif
1959	default:
1960		return (m);
1961	}
1962#if defined(INET) || defined(INET6)
1963	if (M_TRAILINGSPACE(m) >= plen) {
1964		/* easy side we just drop it on the end */
1965		paramh = (struct sctp_paramhdr *)(SCTP_BUF_AT(m, SCTP_BUF_LEN(m)));
1966		mret = m;
1967	} else {
1968		/* Need more space */
1969		mret = m;
1970		while (SCTP_BUF_NEXT(mret) != NULL) {
1971			mret = SCTP_BUF_NEXT(mret);
1972		}
1973		SCTP_BUF_NEXT(mret) = sctp_get_mbuf_for_msg(plen, 0, M_NOWAIT, 1, MT_DATA);
1974		if (SCTP_BUF_NEXT(mret) == NULL) {
1975			/* We are hosed, can't add more addresses */
1976			return (m);
1977		}
1978		mret = SCTP_BUF_NEXT(mret);
1979		paramh = mtod(mret, struct sctp_paramhdr *);
1980	}
1981	/* now add the parameter */
1982	switch (ifa->address.sa.sa_family) {
1983#ifdef INET
1984	case AF_INET:
1985		{
1986			struct sctp_ipv4addr_param *ipv4p;
1987			struct sockaddr_in *sin;
1988
1989			sin = &ifa->address.sin;
1990			ipv4p = (struct sctp_ipv4addr_param *)paramh;
1991			paramh->param_type = htons(SCTP_IPV4_ADDRESS);
1992			paramh->param_length = htons(plen);
1993			ipv4p->addr = sin->sin_addr.s_addr;
1994			SCTP_BUF_LEN(mret) += plen;
1995			break;
1996		}
1997#endif
1998#ifdef INET6
1999	case AF_INET6:
2000		{
2001			struct sctp_ipv6addr_param *ipv6p;
2002			struct sockaddr_in6 *sin6;
2003
2004			sin6 = &ifa->address.sin6;
2005			ipv6p = (struct sctp_ipv6addr_param *)paramh;
2006			paramh->param_type = htons(SCTP_IPV6_ADDRESS);
2007			paramh->param_length = htons(plen);
2008			memcpy(ipv6p->addr, &sin6->sin6_addr,
2009			    sizeof(ipv6p->addr));
2010			/* clear embedded scope in the address */
2011			in6_clearscope((struct in6_addr *)ipv6p->addr);
2012			SCTP_BUF_LEN(mret) += plen;
2013			break;
2014		}
2015#endif
2016	default:
2017		return (m);
2018	}
2019	if (len != NULL) {
2020		*len += plen;
2021	}
2022	return (mret);
2023#endif
2024}
2025
2026
2027struct mbuf *
2028sctp_add_addresses_to_i_ia(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
2029    struct sctp_scoping *scope,
2030    struct mbuf *m_at, int cnt_inits_to,
2031    uint16_t *padding_len, uint16_t *chunk_len)
2032{
2033	struct sctp_vrf *vrf = NULL;
2034	int cnt, limit_out = 0, total_count;
2035	uint32_t vrf_id;
2036
2037	vrf_id = inp->def_vrf_id;
2038	SCTP_IPI_ADDR_RLOCK();
2039	vrf = sctp_find_vrf(vrf_id);
2040	if (vrf == NULL) {
2041		SCTP_IPI_ADDR_RUNLOCK();
2042		return (m_at);
2043	}
2044	if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
2045		struct sctp_ifa *sctp_ifap;
2046		struct sctp_ifn *sctp_ifnp;
2047
2048		cnt = cnt_inits_to;
2049		if (vrf->total_ifa_count > SCTP_COUNT_LIMIT) {
2050			limit_out = 1;
2051			cnt = SCTP_ADDRESS_LIMIT;
2052			goto skip_count;
2053		}
2054		LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2055			if ((scope->loopback_scope == 0) &&
2056			    SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2057				/*
2058				 * Skip loopback devices if loopback_scope
2059				 * not set
2060				 */
2061				continue;
2062			}
2063			LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2064#ifdef INET
2065				if ((sctp_ifap->address.sa.sa_family == AF_INET) &&
2066				    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2067				    &sctp_ifap->address.sin.sin_addr) != 0)) {
2068					continue;
2069				}
2070#endif
2071#ifdef INET6
2072				if ((sctp_ifap->address.sa.sa_family == AF_INET6) &&
2073				    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2074				    &sctp_ifap->address.sin6.sin6_addr) != 0)) {
2075					continue;
2076				}
2077#endif
2078				if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2079					continue;
2080				}
2081				if (sctp_is_address_in_scope(sctp_ifap, scope, 1) == 0) {
2082					continue;
2083				}
2084				cnt++;
2085				if (cnt > SCTP_ADDRESS_LIMIT) {
2086					break;
2087				}
2088			}
2089			if (cnt > SCTP_ADDRESS_LIMIT) {
2090				break;
2091			}
2092		}
2093skip_count:
2094		if (cnt > 1) {
2095			total_count = 0;
2096			LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2097				cnt = 0;
2098				if ((scope->loopback_scope == 0) &&
2099				    SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2100					/*
2101					 * Skip loopback devices if
2102					 * loopback_scope not set
2103					 */
2104					continue;
2105				}
2106				LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2107#ifdef INET
2108					if ((sctp_ifap->address.sa.sa_family == AF_INET) &&
2109					    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2110					    &sctp_ifap->address.sin.sin_addr) != 0)) {
2111						continue;
2112					}
2113#endif
2114#ifdef INET6
2115					if ((sctp_ifap->address.sa.sa_family == AF_INET6) &&
2116					    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2117					    &sctp_ifap->address.sin6.sin6_addr) != 0)) {
2118						continue;
2119					}
2120#endif
2121					if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2122						continue;
2123					}
2124					if (sctp_is_address_in_scope(sctp_ifap,
2125					    scope, 0) == 0) {
2126						continue;
2127					}
2128					if ((chunk_len != NULL) &&
2129					    (padding_len != NULL) &&
2130					    (*padding_len > 0)) {
2131						memset(mtod(m_at, caddr_t)+*chunk_len, 0, *padding_len);
2132						SCTP_BUF_LEN(m_at) += *padding_len;
2133						*chunk_len += *padding_len;
2134						*padding_len = 0;
2135					}
2136					m_at = sctp_add_addr_to_mbuf(m_at, sctp_ifap, chunk_len);
2137					if (limit_out) {
2138						cnt++;
2139						total_count++;
2140						if (cnt >= 2) {
2141							/*
2142							 * two from each
2143							 * address
2144							 */
2145							break;
2146						}
2147						if (total_count > SCTP_ADDRESS_LIMIT) {
2148							/* No more addresses */
2149							break;
2150						}
2151					}
2152				}
2153			}
2154		}
2155	} else {
2156		struct sctp_laddr *laddr;
2157
2158		cnt = cnt_inits_to;
2159		/* First, how many ? */
2160		LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2161			if (laddr->ifa == NULL) {
2162				continue;
2163			}
2164			if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED)
2165				/*
2166				 * Address being deleted by the system, dont
2167				 * list.
2168				 */
2169				continue;
2170			if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2171				/*
2172				 * Address being deleted on this ep don't
2173				 * list.
2174				 */
2175				continue;
2176			}
2177			if (sctp_is_address_in_scope(laddr->ifa,
2178			    scope, 1) == 0) {
2179				continue;
2180			}
2181			cnt++;
2182		}
2183		/*
2184		 * To get through a NAT we only list addresses if we have
2185		 * more than one. That way if you just bind a single address
2186		 * we let the source of the init dictate our address.
2187		 */
2188		if (cnt > 1) {
2189			cnt = cnt_inits_to;
2190			LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2191				if (laddr->ifa == NULL) {
2192					continue;
2193				}
2194				if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED) {
2195					continue;
2196				}
2197				if (sctp_is_address_in_scope(laddr->ifa,
2198				    scope, 0) == 0) {
2199					continue;
2200				}
2201				if ((chunk_len != NULL) &&
2202				    (padding_len != NULL) &&
2203				    (*padding_len > 0)) {
2204					memset(mtod(m_at, caddr_t)+*chunk_len, 0, *padding_len);
2205					SCTP_BUF_LEN(m_at) += *padding_len;
2206					*chunk_len += *padding_len;
2207					*padding_len = 0;
2208				}
2209				m_at = sctp_add_addr_to_mbuf(m_at, laddr->ifa, chunk_len);
2210				cnt++;
2211				if (cnt >= SCTP_ADDRESS_LIMIT) {
2212					break;
2213				}
2214			}
2215		}
2216	}
2217	SCTP_IPI_ADDR_RUNLOCK();
2218	return (m_at);
2219}
2220
2221static struct sctp_ifa *
2222sctp_is_ifa_addr_preferred(struct sctp_ifa *ifa,
2223    uint8_t dest_is_loop,
2224    uint8_t dest_is_priv,
2225    sa_family_t fam)
2226{
2227	uint8_t dest_is_global = 0;
2228
2229	/* dest_is_priv is true if destination is a private address */
2230	/* dest_is_loop is true if destination is a loopback addresses */
2231
2232	/**
2233	 * Here we determine if its a preferred address. A preferred address
2234	 * means it is the same scope or higher scope then the destination.
2235	 * L = loopback, P = private, G = global
2236	 * -----------------------------------------
2237	 *    src    |  dest | result
2238	 *  ----------------------------------------
2239	 *     L     |    L  |    yes
2240	 *  -----------------------------------------
2241	 *     P     |    L  |    yes-v4 no-v6
2242	 *  -----------------------------------------
2243	 *     G     |    L  |    yes-v4 no-v6
2244	 *  -----------------------------------------
2245	 *     L     |    P  |    no
2246	 *  -----------------------------------------
2247	 *     P     |    P  |    yes
2248	 *  -----------------------------------------
2249	 *     G     |    P  |    no
2250	 *   -----------------------------------------
2251	 *     L     |    G  |    no
2252	 *   -----------------------------------------
2253	 *     P     |    G  |    no
2254	 *    -----------------------------------------
2255	 *     G     |    G  |    yes
2256	 *    -----------------------------------------
2257	 */
2258
2259	if (ifa->address.sa.sa_family != fam) {
2260		/* forget mis-matched family */
2261		return (NULL);
2262	}
2263	if ((dest_is_priv == 0) && (dest_is_loop == 0)) {
2264		dest_is_global = 1;
2265	}
2266	SCTPDBG(SCTP_DEBUG_OUTPUT2, "Is destination preferred:");
2267	SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &ifa->address.sa);
2268	/* Ok the address may be ok */
2269#ifdef INET6
2270	if (fam == AF_INET6) {
2271		/* ok to use deprecated addresses? no lets not! */
2272		if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2273			SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:1\n");
2274			return (NULL);
2275		}
2276		if (ifa->src_is_priv && !ifa->src_is_loop) {
2277			if (dest_is_loop) {
2278				SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:2\n");
2279				return (NULL);
2280			}
2281		}
2282		if (ifa->src_is_glob) {
2283			if (dest_is_loop) {
2284				SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:3\n");
2285				return (NULL);
2286			}
2287		}
2288	}
2289#endif
2290	/*
2291	 * Now that we know what is what, implement or table this could in
2292	 * theory be done slicker (it used to be), but this is
2293	 * straightforward and easier to validate :-)
2294	 */
2295	SCTPDBG(SCTP_DEBUG_OUTPUT3, "src_loop:%d src_priv:%d src_glob:%d\n",
2296	    ifa->src_is_loop, ifa->src_is_priv, ifa->src_is_glob);
2297	SCTPDBG(SCTP_DEBUG_OUTPUT3, "dest_loop:%d dest_priv:%d dest_glob:%d\n",
2298	    dest_is_loop, dest_is_priv, dest_is_global);
2299
2300	if ((ifa->src_is_loop) && (dest_is_priv)) {
2301		SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:4\n");
2302		return (NULL);
2303	}
2304	if ((ifa->src_is_glob) && (dest_is_priv)) {
2305		SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:5\n");
2306		return (NULL);
2307	}
2308	if ((ifa->src_is_loop) && (dest_is_global)) {
2309		SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:6\n");
2310		return (NULL);
2311	}
2312	if ((ifa->src_is_priv) && (dest_is_global)) {
2313		SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:7\n");
2314		return (NULL);
2315	}
2316	SCTPDBG(SCTP_DEBUG_OUTPUT3, "YES\n");
2317	/* its a preferred address */
2318	return (ifa);
2319}
2320
2321static struct sctp_ifa *
2322sctp_is_ifa_addr_acceptable(struct sctp_ifa *ifa,
2323    uint8_t dest_is_loop,
2324    uint8_t dest_is_priv,
2325    sa_family_t fam)
2326{
2327	uint8_t dest_is_global = 0;
2328
2329	/**
2330	 * Here we determine if its a acceptable address. A acceptable
2331	 * address means it is the same scope or higher scope but we can
2332	 * allow for NAT which means its ok to have a global dest and a
2333	 * private src.
2334	 *
2335	 * L = loopback, P = private, G = global
2336	 * -----------------------------------------
2337	 *  src    |  dest | result
2338	 * -----------------------------------------
2339	 *   L     |   L   |    yes
2340	 *  -----------------------------------------
2341	 *   P     |   L   |    yes-v4 no-v6
2342	 *  -----------------------------------------
2343	 *   G     |   L   |    yes
2344	 * -----------------------------------------
2345	 *   L     |   P   |    no
2346	 * -----------------------------------------
2347	 *   P     |   P   |    yes
2348	 * -----------------------------------------
2349	 *   G     |   P   |    yes - May not work
2350	 * -----------------------------------------
2351	 *   L     |   G   |    no
2352	 * -----------------------------------------
2353	 *   P     |   G   |    yes - May not work
2354	 * -----------------------------------------
2355	 *   G     |   G   |    yes
2356	 * -----------------------------------------
2357	 */
2358
2359	if (ifa->address.sa.sa_family != fam) {
2360		/* forget non matching family */
2361		SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa_fam:%d fam:%d\n",
2362		    ifa->address.sa.sa_family, fam);
2363		return (NULL);
2364	}
2365	/* Ok the address may be ok */
2366	SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, &ifa->address.sa);
2367	SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst_is_loop:%d dest_is_priv:%d\n",
2368	    dest_is_loop, dest_is_priv);
2369	if ((dest_is_loop == 0) && (dest_is_priv == 0)) {
2370		dest_is_global = 1;
2371	}
2372#ifdef INET6
2373	if (fam == AF_INET6) {
2374		/* ok to use deprecated addresses? */
2375		if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2376			return (NULL);
2377		}
2378		if (ifa->src_is_priv) {
2379			/* Special case, linklocal to loop */
2380			if (dest_is_loop)
2381				return (NULL);
2382		}
2383	}
2384#endif
2385	/*
2386	 * Now that we know what is what, implement our table. This could in
2387	 * theory be done slicker (it used to be), but this is
2388	 * straightforward and easier to validate :-)
2389	 */
2390	SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_priv:%d\n",
2391	    ifa->src_is_loop,
2392	    dest_is_priv);
2393	if ((ifa->src_is_loop == 1) && (dest_is_priv)) {
2394		return (NULL);
2395	}
2396	SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_glob:%d\n",
2397	    ifa->src_is_loop,
2398	    dest_is_global);
2399	if ((ifa->src_is_loop == 1) && (dest_is_global)) {
2400		return (NULL);
2401	}
2402	SCTPDBG(SCTP_DEBUG_OUTPUT3, "address is acceptable\n");
2403	/* its an acceptable address */
2404	return (ifa);
2405}
2406
2407int
2408sctp_is_addr_restricted(struct sctp_tcb *stcb, struct sctp_ifa *ifa)
2409{
2410	struct sctp_laddr *laddr;
2411
2412	if (stcb == NULL) {
2413		/* There are no restrictions, no TCB :-) */
2414		return (0);
2415	}
2416	LIST_FOREACH(laddr, &stcb->asoc.sctp_restricted_addrs, sctp_nxt_addr) {
2417		if (laddr->ifa == NULL) {
2418			SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2419			    __func__);
2420			continue;
2421		}
2422		if (laddr->ifa == ifa) {
2423			/* Yes it is on the list */
2424			return (1);
2425		}
2426	}
2427	return (0);
2428}
2429
2430
2431int
2432sctp_is_addr_in_ep(struct sctp_inpcb *inp, struct sctp_ifa *ifa)
2433{
2434	struct sctp_laddr *laddr;
2435
2436	if (ifa == NULL)
2437		return (0);
2438	LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2439		if (laddr->ifa == NULL) {
2440			SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2441			    __func__);
2442			continue;
2443		}
2444		if ((laddr->ifa == ifa) && laddr->action == 0)
2445			/* same pointer */
2446			return (1);
2447	}
2448	return (0);
2449}
2450
2451
2452
2453static struct sctp_ifa *
2454sctp_choose_boundspecific_inp(struct sctp_inpcb *inp,
2455    sctp_route_t *ro,
2456    uint32_t vrf_id,
2457    int non_asoc_addr_ok,
2458    uint8_t dest_is_priv,
2459    uint8_t dest_is_loop,
2460    sa_family_t fam)
2461{
2462	struct sctp_laddr *laddr, *starting_point;
2463	void *ifn;
2464	int resettotop = 0;
2465	struct sctp_ifn *sctp_ifn;
2466	struct sctp_ifa *sctp_ifa, *sifa;
2467	struct sctp_vrf *vrf;
2468	uint32_t ifn_index;
2469
2470	vrf = sctp_find_vrf(vrf_id);
2471	if (vrf == NULL)
2472		return (NULL);
2473
2474	ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2475	ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2476	sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2477	/*
2478	 * first question, is the ifn we will emit on in our list, if so, we
2479	 * want such an address. Note that we first looked for a preferred
2480	 * address.
2481	 */
2482	if (sctp_ifn) {
2483		/* is a preferred one on the interface we route out? */
2484		LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2485#ifdef INET
2486			if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2487			    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2488			    &sctp_ifa->address.sin.sin_addr) != 0)) {
2489				continue;
2490			}
2491#endif
2492#ifdef INET6
2493			if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2494			    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2495			    &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2496				continue;
2497			}
2498#endif
2499			if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2500			    (non_asoc_addr_ok == 0))
2501				continue;
2502			sifa = sctp_is_ifa_addr_preferred(sctp_ifa,
2503			    dest_is_loop,
2504			    dest_is_priv, fam);
2505			if (sifa == NULL)
2506				continue;
2507			if (sctp_is_addr_in_ep(inp, sifa)) {
2508				atomic_add_int(&sifa->refcount, 1);
2509				return (sifa);
2510			}
2511		}
2512	}
2513	/*
2514	 * ok, now we now need to find one on the list of the addresses. We
2515	 * can't get one on the emitting interface so let's find first a
2516	 * preferred one. If not that an acceptable one otherwise... we
2517	 * return NULL.
2518	 */
2519	starting_point = inp->next_addr_touse;
2520once_again:
2521	if (inp->next_addr_touse == NULL) {
2522		inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2523		resettotop = 1;
2524	}
2525	for (laddr = inp->next_addr_touse; laddr;
2526	    laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2527		if (laddr->ifa == NULL) {
2528			/* address has been removed */
2529			continue;
2530		}
2531		if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2532			/* address is being deleted */
2533			continue;
2534		}
2535		sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop,
2536		    dest_is_priv, fam);
2537		if (sifa == NULL)
2538			continue;
2539		atomic_add_int(&sifa->refcount, 1);
2540		return (sifa);
2541	}
2542	if (resettotop == 0) {
2543		inp->next_addr_touse = NULL;
2544		goto once_again;
2545	}
2546
2547	inp->next_addr_touse = starting_point;
2548	resettotop = 0;
2549once_again_too:
2550	if (inp->next_addr_touse == NULL) {
2551		inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2552		resettotop = 1;
2553	}
2554
2555	/* ok, what about an acceptable address in the inp */
2556	for (laddr = inp->next_addr_touse; laddr;
2557	    laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2558		if (laddr->ifa == NULL) {
2559			/* address has been removed */
2560			continue;
2561		}
2562		if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2563			/* address is being deleted */
2564			continue;
2565		}
2566		sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2567		    dest_is_priv, fam);
2568		if (sifa == NULL)
2569			continue;
2570		atomic_add_int(&sifa->refcount, 1);
2571		return (sifa);
2572	}
2573	if (resettotop == 0) {
2574		inp->next_addr_touse = NULL;
2575		goto once_again_too;
2576	}
2577
2578	/*
2579	 * no address bound can be a source for the destination we are in
2580	 * trouble
2581	 */
2582	return (NULL);
2583}
2584
2585
2586
2587static struct sctp_ifa *
2588sctp_choose_boundspecific_stcb(struct sctp_inpcb *inp,
2589    struct sctp_tcb *stcb,
2590    sctp_route_t *ro,
2591    uint32_t vrf_id,
2592    uint8_t dest_is_priv,
2593    uint8_t dest_is_loop,
2594    int non_asoc_addr_ok,
2595    sa_family_t fam)
2596{
2597	struct sctp_laddr *laddr, *starting_point;
2598	void *ifn;
2599	struct sctp_ifn *sctp_ifn;
2600	struct sctp_ifa *sctp_ifa, *sifa;
2601	uint8_t start_at_beginning = 0;
2602	struct sctp_vrf *vrf;
2603	uint32_t ifn_index;
2604
2605	/*
2606	 * first question, is the ifn we will emit on in our list, if so, we
2607	 * want that one.
2608	 */
2609	vrf = sctp_find_vrf(vrf_id);
2610	if (vrf == NULL)
2611		return (NULL);
2612
2613	ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2614	ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2615	sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2616
2617	/*
2618	 * first question, is the ifn we will emit on in our list?  If so,
2619	 * we want that one. First we look for a preferred. Second, we go
2620	 * for an acceptable.
2621	 */
2622	if (sctp_ifn) {
2623		/* first try for a preferred address on the ep */
2624		LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2625#ifdef INET
2626			if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2627			    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2628			    &sctp_ifa->address.sin.sin_addr) != 0)) {
2629				continue;
2630			}
2631#endif
2632#ifdef INET6
2633			if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2634			    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2635			    &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2636				continue;
2637			}
2638#endif
2639			if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2640				continue;
2641			if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2642				sifa = sctp_is_ifa_addr_preferred(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2643				if (sifa == NULL)
2644					continue;
2645				if (((non_asoc_addr_ok == 0) &&
2646				    (sctp_is_addr_restricted(stcb, sifa))) ||
2647				    (non_asoc_addr_ok &&
2648				    (sctp_is_addr_restricted(stcb, sifa)) &&
2649				    (!sctp_is_addr_pending(stcb, sifa)))) {
2650					/* on the no-no list */
2651					continue;
2652				}
2653				atomic_add_int(&sifa->refcount, 1);
2654				return (sifa);
2655			}
2656		}
2657		/* next try for an acceptable address on the ep */
2658		LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2659#ifdef INET
2660			if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2661			    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2662			    &sctp_ifa->address.sin.sin_addr) != 0)) {
2663				continue;
2664			}
2665#endif
2666#ifdef INET6
2667			if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2668			    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2669			    &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2670				continue;
2671			}
2672#endif
2673			if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2674				continue;
2675			if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2676				sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2677				if (sifa == NULL)
2678					continue;
2679				if (((non_asoc_addr_ok == 0) &&
2680				    (sctp_is_addr_restricted(stcb, sifa))) ||
2681				    (non_asoc_addr_ok &&
2682				    (sctp_is_addr_restricted(stcb, sifa)) &&
2683				    (!sctp_is_addr_pending(stcb, sifa)))) {
2684					/* on the no-no list */
2685					continue;
2686				}
2687				atomic_add_int(&sifa->refcount, 1);
2688				return (sifa);
2689			}
2690		}
2691
2692	}
2693	/*
2694	 * if we can't find one like that then we must look at all addresses
2695	 * bound to pick one at first preferable then secondly acceptable.
2696	 */
2697	starting_point = stcb->asoc.last_used_address;
2698sctp_from_the_top:
2699	if (stcb->asoc.last_used_address == NULL) {
2700		start_at_beginning = 1;
2701		stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2702	}
2703	/* search beginning with the last used address */
2704	for (laddr = stcb->asoc.last_used_address; laddr;
2705	    laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2706		if (laddr->ifa == NULL) {
2707			/* address has been removed */
2708			continue;
2709		}
2710		if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2711			/* address is being deleted */
2712			continue;
2713		}
2714		sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop, dest_is_priv, fam);
2715		if (sifa == NULL)
2716			continue;
2717		if (((non_asoc_addr_ok == 0) &&
2718		    (sctp_is_addr_restricted(stcb, sifa))) ||
2719		    (non_asoc_addr_ok &&
2720		    (sctp_is_addr_restricted(stcb, sifa)) &&
2721		    (!sctp_is_addr_pending(stcb, sifa)))) {
2722			/* on the no-no list */
2723			continue;
2724		}
2725		stcb->asoc.last_used_address = laddr;
2726		atomic_add_int(&sifa->refcount, 1);
2727		return (sifa);
2728	}
2729	if (start_at_beginning == 0) {
2730		stcb->asoc.last_used_address = NULL;
2731		goto sctp_from_the_top;
2732	}
2733	/* now try for any higher scope than the destination */
2734	stcb->asoc.last_used_address = starting_point;
2735	start_at_beginning = 0;
2736sctp_from_the_top2:
2737	if (stcb->asoc.last_used_address == NULL) {
2738		start_at_beginning = 1;
2739		stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2740	}
2741	/* search beginning with the last used address */
2742	for (laddr = stcb->asoc.last_used_address; laddr;
2743	    laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2744		if (laddr->ifa == NULL) {
2745			/* address has been removed */
2746			continue;
2747		}
2748		if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2749			/* address is being deleted */
2750			continue;
2751		}
2752		sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2753		    dest_is_priv, fam);
2754		if (sifa == NULL)
2755			continue;
2756		if (((non_asoc_addr_ok == 0) &&
2757		    (sctp_is_addr_restricted(stcb, sifa))) ||
2758		    (non_asoc_addr_ok &&
2759		    (sctp_is_addr_restricted(stcb, sifa)) &&
2760		    (!sctp_is_addr_pending(stcb, sifa)))) {
2761			/* on the no-no list */
2762			continue;
2763		}
2764		stcb->asoc.last_used_address = laddr;
2765		atomic_add_int(&sifa->refcount, 1);
2766		return (sifa);
2767	}
2768	if (start_at_beginning == 0) {
2769		stcb->asoc.last_used_address = NULL;
2770		goto sctp_from_the_top2;
2771	}
2772	return (NULL);
2773}
2774
2775static struct sctp_ifa *
2776sctp_select_nth_preferred_addr_from_ifn_boundall(struct sctp_ifn *ifn,
2777    struct sctp_inpcb *inp,
2778    struct sctp_tcb *stcb,
2779    int non_asoc_addr_ok,
2780    uint8_t dest_is_loop,
2781    uint8_t dest_is_priv,
2782    int addr_wanted,
2783    sa_family_t fam,
2784    sctp_route_t *ro
2785)
2786{
2787	struct sctp_ifa *ifa, *sifa;
2788	int num_eligible_addr = 0;
2789#ifdef INET6
2790	struct sockaddr_in6 sin6, lsa6;
2791
2792	if (fam == AF_INET6) {
2793		memcpy(&sin6, &ro->ro_dst, sizeof(struct sockaddr_in6));
2794		(void)sa6_recoverscope(&sin6);
2795	}
2796#endif				/* INET6 */
2797	LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2798#ifdef INET
2799		if ((ifa->address.sa.sa_family == AF_INET) &&
2800		    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2801		    &ifa->address.sin.sin_addr) != 0)) {
2802			continue;
2803		}
2804#endif
2805#ifdef INET6
2806		if ((ifa->address.sa.sa_family == AF_INET6) &&
2807		    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2808		    &ifa->address.sin6.sin6_addr) != 0)) {
2809			continue;
2810		}
2811#endif
2812		if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2813		    (non_asoc_addr_ok == 0))
2814			continue;
2815		sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2816		    dest_is_priv, fam);
2817		if (sifa == NULL)
2818			continue;
2819#ifdef INET6
2820		if (fam == AF_INET6 &&
2821		    dest_is_loop &&
2822		    sifa->src_is_loop && sifa->src_is_priv) {
2823			/*
2824			 * don't allow fe80::1 to be a src on loop ::1, we
2825			 * don't list it to the peer so we will get an
2826			 * abort.
2827			 */
2828			continue;
2829		}
2830		if (fam == AF_INET6 &&
2831		    IN6_IS_ADDR_LINKLOCAL(&sifa->address.sin6.sin6_addr) &&
2832		    IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr)) {
2833			/*
2834			 * link-local <-> link-local must belong to the same
2835			 * scope.
2836			 */
2837			memcpy(&lsa6, &sifa->address.sin6, sizeof(struct sockaddr_in6));
2838			(void)sa6_recoverscope(&lsa6);
2839			if (sin6.sin6_scope_id != lsa6.sin6_scope_id) {
2840				continue;
2841			}
2842		}
2843#endif				/* INET6 */
2844
2845		/*
2846		 * Check if the IPv6 address matches to next-hop. In the
2847		 * mobile case, old IPv6 address may be not deleted from the
2848		 * interface. Then, the interface has previous and new
2849		 * addresses.  We should use one corresponding to the
2850		 * next-hop.  (by micchie)
2851		 */
2852#ifdef INET6
2853		if (stcb && fam == AF_INET6 &&
2854		    sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2855			if (sctp_v6src_match_nexthop(&sifa->address.sin6, ro)
2856			    == 0) {
2857				continue;
2858			}
2859		}
2860#endif
2861#ifdef INET
2862		/* Avoid topologically incorrect IPv4 address */
2863		if (stcb && fam == AF_INET &&
2864		    sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2865			if (sctp_v4src_match_nexthop(sifa, ro) == 0) {
2866				continue;
2867			}
2868		}
2869#endif
2870		if (stcb) {
2871			if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
2872				continue;
2873			}
2874			if (((non_asoc_addr_ok == 0) &&
2875			    (sctp_is_addr_restricted(stcb, sifa))) ||
2876			    (non_asoc_addr_ok &&
2877			    (sctp_is_addr_restricted(stcb, sifa)) &&
2878			    (!sctp_is_addr_pending(stcb, sifa)))) {
2879				/*
2880				 * It is restricted for some reason..
2881				 * probably not yet added.
2882				 */
2883				continue;
2884			}
2885		}
2886		if (num_eligible_addr >= addr_wanted) {
2887			return (sifa);
2888		}
2889		num_eligible_addr++;
2890	}
2891	return (NULL);
2892}
2893
2894
2895static int
2896sctp_count_num_preferred_boundall(struct sctp_ifn *ifn,
2897    struct sctp_inpcb *inp,
2898    struct sctp_tcb *stcb,
2899    int non_asoc_addr_ok,
2900    uint8_t dest_is_loop,
2901    uint8_t dest_is_priv,
2902    sa_family_t fam)
2903{
2904	struct sctp_ifa *ifa, *sifa;
2905	int num_eligible_addr = 0;
2906
2907	LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2908#ifdef INET
2909		if ((ifa->address.sa.sa_family == AF_INET) &&
2910		    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2911		    &ifa->address.sin.sin_addr) != 0)) {
2912			continue;
2913		}
2914#endif
2915#ifdef INET6
2916		if ((ifa->address.sa.sa_family == AF_INET6) &&
2917		    (stcb != NULL) &&
2918		    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2919		    &ifa->address.sin6.sin6_addr) != 0)) {
2920			continue;
2921		}
2922#endif
2923		if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2924		    (non_asoc_addr_ok == 0)) {
2925			continue;
2926		}
2927		sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2928		    dest_is_priv, fam);
2929		if (sifa == NULL) {
2930			continue;
2931		}
2932		if (stcb) {
2933			if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
2934				continue;
2935			}
2936			if (((non_asoc_addr_ok == 0) &&
2937			    (sctp_is_addr_restricted(stcb, sifa))) ||
2938			    (non_asoc_addr_ok &&
2939			    (sctp_is_addr_restricted(stcb, sifa)) &&
2940			    (!sctp_is_addr_pending(stcb, sifa)))) {
2941				/*
2942				 * It is restricted for some reason..
2943				 * probably not yet added.
2944				 */
2945				continue;
2946			}
2947		}
2948		num_eligible_addr++;
2949	}
2950	return (num_eligible_addr);
2951}
2952
2953static struct sctp_ifa *
2954sctp_choose_boundall(struct sctp_inpcb *inp,
2955    struct sctp_tcb *stcb,
2956    struct sctp_nets *net,
2957    sctp_route_t *ro,
2958    uint32_t vrf_id,
2959    uint8_t dest_is_priv,
2960    uint8_t dest_is_loop,
2961    int non_asoc_addr_ok,
2962    sa_family_t fam)
2963{
2964	int cur_addr_num = 0, num_preferred = 0;
2965	void *ifn;
2966	struct sctp_ifn *sctp_ifn, *looked_at = NULL, *emit_ifn;
2967	struct sctp_ifa *sctp_ifa, *sifa;
2968	uint32_t ifn_index;
2969	struct sctp_vrf *vrf;
2970#ifdef INET
2971	int retried = 0;
2972#endif
2973
2974	/*-
2975	 * For boundall we can use any address in the association.
2976	 * If non_asoc_addr_ok is set we can use any address (at least in
2977	 * theory). So we look for preferred addresses first. If we find one,
2978	 * we use it. Otherwise we next try to get an address on the
2979	 * interface, which we should be able to do (unless non_asoc_addr_ok
2980	 * is false and we are routed out that way). In these cases where we
2981	 * can't use the address of the interface we go through all the
2982	 * ifn's looking for an address we can use and fill that in. Punting
2983	 * means we send back address 0, which will probably cause problems
2984	 * actually since then IP will fill in the address of the route ifn,
2985	 * which means we probably already rejected it.. i.e. here comes an
2986	 * abort :-<.
2987	 */
2988	vrf = sctp_find_vrf(vrf_id);
2989	if (vrf == NULL)
2990		return (NULL);
2991
2992	ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2993	ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2994	SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn from route:%p ifn_index:%d\n", ifn, ifn_index);
2995	emit_ifn = looked_at = sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2996	if (sctp_ifn == NULL) {
2997		/* ?? We don't have this guy ?? */
2998		SCTPDBG(SCTP_DEBUG_OUTPUT2, "No ifn emit interface?\n");
2999		goto bound_all_plan_b;
3000	}
3001	SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn_index:%d name:%s is emit interface\n",
3002	    ifn_index, sctp_ifn->ifn_name);
3003
3004	if (net) {
3005		cur_addr_num = net->indx_of_eligible_next_to_use;
3006	}
3007	num_preferred = sctp_count_num_preferred_boundall(sctp_ifn,
3008	    inp, stcb,
3009	    non_asoc_addr_ok,
3010	    dest_is_loop,
3011	    dest_is_priv, fam);
3012	SCTPDBG(SCTP_DEBUG_OUTPUT2, "Found %d preferred source addresses for intf:%s\n",
3013	    num_preferred, sctp_ifn->ifn_name);
3014	if (num_preferred == 0) {
3015		/*
3016		 * no eligible addresses, we must use some other interface
3017		 * address if we can find one.
3018		 */
3019		goto bound_all_plan_b;
3020	}
3021	/*
3022	 * Ok we have num_eligible_addr set with how many we can use, this
3023	 * may vary from call to call due to addresses being deprecated
3024	 * etc..
3025	 */
3026	if (cur_addr_num >= num_preferred) {
3027		cur_addr_num = 0;
3028	}
3029	/*
3030	 * select the nth address from the list (where cur_addr_num is the
3031	 * nth) and 0 is the first one, 1 is the second one etc...
3032	 */
3033	SCTPDBG(SCTP_DEBUG_OUTPUT2, "cur_addr_num:%d\n", cur_addr_num);
3034
3035	sctp_ifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok, dest_is_loop,
3036	    dest_is_priv, cur_addr_num, fam, ro);
3037
3038	/* if sctp_ifa is NULL something changed??, fall to plan b. */
3039	if (sctp_ifa) {
3040		atomic_add_int(&sctp_ifa->refcount, 1);
3041		if (net) {
3042			/* save off where the next one we will want */
3043			net->indx_of_eligible_next_to_use = cur_addr_num + 1;
3044		}
3045		return (sctp_ifa);
3046	}
3047	/*
3048	 * plan_b: Look at all interfaces and find a preferred address. If
3049	 * no preferred fall through to plan_c.
3050	 */
3051bound_all_plan_b:
3052	SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan B\n");
3053	LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3054		SCTPDBG(SCTP_DEBUG_OUTPUT2, "Examine interface %s\n",
3055		    sctp_ifn->ifn_name);
3056		if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3057			/* wrong base scope */
3058			SCTPDBG(SCTP_DEBUG_OUTPUT2, "skip\n");
3059			continue;
3060		}
3061		if ((sctp_ifn == looked_at) && looked_at) {
3062			/* already looked at this guy */
3063			SCTPDBG(SCTP_DEBUG_OUTPUT2, "already seen\n");
3064			continue;
3065		}
3066		num_preferred = sctp_count_num_preferred_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok,
3067		    dest_is_loop, dest_is_priv, fam);
3068		SCTPDBG(SCTP_DEBUG_OUTPUT2,
3069		    "Found ifn:%p %d preferred source addresses\n",
3070		    ifn, num_preferred);
3071		if (num_preferred == 0) {
3072			/* None on this interface. */
3073			SCTPDBG(SCTP_DEBUG_OUTPUT2, "No preferred -- skipping to next\n");
3074			continue;
3075		}
3076		SCTPDBG(SCTP_DEBUG_OUTPUT2,
3077		    "num preferred:%d on interface:%p cur_addr_num:%d\n",
3078		    num_preferred, (void *)sctp_ifn, cur_addr_num);
3079
3080		/*
3081		 * Ok we have num_eligible_addr set with how many we can
3082		 * use, this may vary from call to call due to addresses
3083		 * being deprecated etc..
3084		 */
3085		if (cur_addr_num >= num_preferred) {
3086			cur_addr_num = 0;
3087		}
3088		sifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok, dest_is_loop,
3089		    dest_is_priv, cur_addr_num, fam, ro);
3090		if (sifa == NULL)
3091			continue;
3092		if (net) {
3093			net->indx_of_eligible_next_to_use = cur_addr_num + 1;
3094			SCTPDBG(SCTP_DEBUG_OUTPUT2, "we selected %d\n",
3095			    cur_addr_num);
3096			SCTPDBG(SCTP_DEBUG_OUTPUT2, "Source:");
3097			SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
3098			SCTPDBG(SCTP_DEBUG_OUTPUT2, "Dest:");
3099			SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &net->ro._l_addr.sa);
3100		}
3101		atomic_add_int(&sifa->refcount, 1);
3102		return (sifa);
3103	}
3104#ifdef INET
3105again_with_private_addresses_allowed:
3106#endif
3107	/* plan_c: do we have an acceptable address on the emit interface */
3108	sifa = NULL;
3109	SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan C: find acceptable on interface\n");
3110	if (emit_ifn == NULL) {
3111		SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jump to Plan D - no emit_ifn\n");
3112		goto plan_d;
3113	}
3114	LIST_FOREACH(sctp_ifa, &emit_ifn->ifalist, next_ifa) {
3115		SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifa:%p\n", (void *)sctp_ifa);
3116#ifdef INET
3117		if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3118		    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3119		    &sctp_ifa->address.sin.sin_addr) != 0)) {
3120			SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jailed\n");
3121			continue;
3122		}
3123#endif
3124#ifdef INET6
3125		if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3126		    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3127		    &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3128			SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jailed\n");
3129			continue;
3130		}
3131#endif
3132		if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3133		    (non_asoc_addr_ok == 0)) {
3134			SCTPDBG(SCTP_DEBUG_OUTPUT2, "Defer\n");
3135			continue;
3136		}
3137		sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop,
3138		    dest_is_priv, fam);
3139		if (sifa == NULL) {
3140			SCTPDBG(SCTP_DEBUG_OUTPUT2, "IFA not acceptable\n");
3141			continue;
3142		}
3143		if (stcb) {
3144			if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
3145				SCTPDBG(SCTP_DEBUG_OUTPUT2, "NOT in scope\n");
3146				sifa = NULL;
3147				continue;
3148			}
3149			if (((non_asoc_addr_ok == 0) &&
3150			    (sctp_is_addr_restricted(stcb, sifa))) ||
3151			    (non_asoc_addr_ok &&
3152			    (sctp_is_addr_restricted(stcb, sifa)) &&
3153			    (!sctp_is_addr_pending(stcb, sifa)))) {
3154				/*
3155				 * It is restricted for some reason..
3156				 * probably not yet added.
3157				 */
3158				SCTPDBG(SCTP_DEBUG_OUTPUT2, "Its restricted\n");
3159				sifa = NULL;
3160				continue;
3161			}
3162		}
3163		atomic_add_int(&sifa->refcount, 1);
3164		goto out;
3165	}
3166plan_d:
3167	/*
3168	 * plan_d: We are in trouble. No preferred address on the emit
3169	 * interface. And not even a preferred address on all interfaces. Go
3170	 * out and see if we can find an acceptable address somewhere
3171	 * amongst all interfaces.
3172	 */
3173	SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan D looked_at is %p\n", (void *)looked_at);
3174	LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3175		if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3176			/* wrong base scope */
3177			continue;
3178		}
3179		LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3180#ifdef INET
3181			if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3182			    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3183			    &sctp_ifa->address.sin.sin_addr) != 0)) {
3184				continue;
3185			}
3186#endif
3187#ifdef INET6
3188			if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3189			    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3190			    &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3191				continue;
3192			}
3193#endif
3194			if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3195			    (non_asoc_addr_ok == 0))
3196				continue;
3197			sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3198			    dest_is_loop,
3199			    dest_is_priv, fam);
3200			if (sifa == NULL)
3201				continue;
3202			if (stcb) {
3203				if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
3204					sifa = NULL;
3205					continue;
3206				}
3207				if (((non_asoc_addr_ok == 0) &&
3208				    (sctp_is_addr_restricted(stcb, sifa))) ||
3209				    (non_asoc_addr_ok &&
3210				    (sctp_is_addr_restricted(stcb, sifa)) &&
3211				    (!sctp_is_addr_pending(stcb, sifa)))) {
3212					/*
3213					 * It is restricted for some
3214					 * reason.. probably not yet added.
3215					 */
3216					sifa = NULL;
3217					continue;
3218				}
3219			}
3220			goto out;
3221		}
3222	}
3223#ifdef INET
3224	if (stcb) {
3225		if ((retried == 0) && (stcb->asoc.scope.ipv4_local_scope == 0)) {
3226			stcb->asoc.scope.ipv4_local_scope = 1;
3227			retried = 1;
3228			goto again_with_private_addresses_allowed;
3229		} else if (retried == 1) {
3230			stcb->asoc.scope.ipv4_local_scope = 0;
3231		}
3232	}
3233#endif
3234out:
3235#ifdef INET
3236	if (sifa) {
3237		if (retried == 1) {
3238			LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3239				if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3240					/* wrong base scope */
3241					continue;
3242				}
3243				LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3244					struct sctp_ifa *tmp_sifa;
3245
3246#ifdef INET
3247					if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3248					    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3249					    &sctp_ifa->address.sin.sin_addr) != 0)) {
3250						continue;
3251					}
3252#endif
3253#ifdef INET6
3254					if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3255					    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3256					    &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3257						continue;
3258					}
3259#endif
3260					if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3261					    (non_asoc_addr_ok == 0))
3262						continue;
3263					tmp_sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3264					    dest_is_loop,
3265					    dest_is_priv, fam);
3266					if (tmp_sifa == NULL) {
3267						continue;
3268					}
3269					if (tmp_sifa == sifa) {
3270						continue;
3271					}
3272					if (stcb) {
3273						if (sctp_is_address_in_scope(tmp_sifa,
3274						    &stcb->asoc.scope, 0) == 0) {
3275							continue;
3276						}
3277						if (((non_asoc_addr_ok == 0) &&
3278						    (sctp_is_addr_restricted(stcb, tmp_sifa))) ||
3279						    (non_asoc_addr_ok &&
3280						    (sctp_is_addr_restricted(stcb, tmp_sifa)) &&
3281						    (!sctp_is_addr_pending(stcb, tmp_sifa)))) {
3282							/*
3283							 * It is restricted
3284							 * for some reason..
3285							 * probably not yet
3286							 * added.
3287							 */
3288							continue;
3289						}
3290					}
3291					if ((tmp_sifa->address.sin.sin_family == AF_INET) &&
3292					    (IN4_ISPRIVATE_ADDRESS(&(tmp_sifa->address.sin.sin_addr)))) {
3293						sctp_add_local_addr_restricted(stcb, tmp_sifa);
3294					}
3295				}
3296			}
3297		}
3298		atomic_add_int(&sifa->refcount, 1);
3299	}
3300#endif
3301	return (sifa);
3302}
3303
3304
3305
3306/* tcb may be NULL */
3307struct sctp_ifa *
3308sctp_source_address_selection(struct sctp_inpcb *inp,
3309    struct sctp_tcb *stcb,
3310    sctp_route_t *ro,
3311    struct sctp_nets *net,
3312    int non_asoc_addr_ok, uint32_t vrf_id)
3313{
3314	struct sctp_ifa *answer;
3315	uint8_t dest_is_priv, dest_is_loop;
3316	sa_family_t fam;
3317#ifdef INET
3318	struct sockaddr_in *to = (struct sockaddr_in *)&ro->ro_dst;
3319#endif
3320#ifdef INET6
3321	struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&ro->ro_dst;
3322#endif
3323
3324	/**
3325	 * Rules:
3326	 * - Find the route if needed, cache if I can.
3327	 * - Look at interface address in route, Is it in the bound list. If so we
3328	 *   have the best source.
3329	 * - If not we must rotate amongst the addresses.
3330	 *
3331	 * Cavets and issues
3332	 *
3333	 * Do we need to pay attention to scope. We can have a private address
3334	 * or a global address we are sourcing or sending to. So if we draw
3335	 * it out
3336	 * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3337	 * For V4
3338	 * ------------------------------------------
3339	 *      source     *      dest  *  result
3340	 * -----------------------------------------
3341	 * <a>  Private    *    Global  *  NAT
3342	 * -----------------------------------------
3343	 * <b>  Private    *    Private *  No problem
3344	 * -----------------------------------------
3345	 * <c>  Global     *    Private *  Huh, How will this work?
3346	 * -----------------------------------------
3347	 * <d>  Global     *    Global  *  No Problem
3348	 *------------------------------------------
3349	 * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3350	 * For V6
3351	 *------------------------------------------
3352	 *      source     *      dest  *  result
3353	 * -----------------------------------------
3354	 * <a>  Linklocal  *    Global  *
3355	 * -----------------------------------------
3356	 * <b>  Linklocal  * Linklocal  *  No problem
3357	 * -----------------------------------------
3358	 * <c>  Global     * Linklocal  *  Huh, How will this work?
3359	 * -----------------------------------------
3360	 * <d>  Global     *    Global  *  No Problem
3361	 *------------------------------------------
3362	 * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3363	 *
3364	 * And then we add to that what happens if there are multiple addresses
3365	 * assigned to an interface. Remember the ifa on a ifn is a linked
3366	 * list of addresses. So one interface can have more than one IP
3367	 * address. What happens if we have both a private and a global
3368	 * address? Do we then use context of destination to sort out which
3369	 * one is best? And what about NAT's sending P->G may get you a NAT
3370	 * translation, or should you select the G thats on the interface in
3371	 * preference.
3372	 *
3373	 * Decisions:
3374	 *
3375	 * - count the number of addresses on the interface.
3376	 * - if it is one, no problem except case <c>.
3377	 *   For <a> we will assume a NAT out there.
3378	 * - if there are more than one, then we need to worry about scope P
3379	 *   or G. We should prefer G -> G and P -> P if possible.
3380	 *   Then as a secondary fall back to mixed types G->P being a last
3381	 *   ditch one.
3382	 * - The above all works for bound all, but bound specific we need to
3383	 *   use the same concept but instead only consider the bound
3384	 *   addresses. If the bound set is NOT assigned to the interface then
3385	 *   we must use rotation amongst the bound addresses..
3386	 */
3387	if (ro->ro_rt == NULL) {
3388		/*
3389		 * Need a route to cache.
3390		 */
3391		SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
3392	}
3393	if (ro->ro_rt == NULL) {
3394		return (NULL);
3395	}
3396	fam = ro->ro_dst.sa_family;
3397	dest_is_priv = dest_is_loop = 0;
3398	/* Setup our scopes for the destination */
3399	switch (fam) {
3400#ifdef INET
3401	case AF_INET:
3402		/* Scope based on outbound address */
3403		if (IN4_ISLOOPBACK_ADDRESS(&to->sin_addr)) {
3404			dest_is_loop = 1;
3405			if (net != NULL) {
3406				/* mark it as local */
3407				net->addr_is_local = 1;
3408			}
3409		} else if ((IN4_ISPRIVATE_ADDRESS(&to->sin_addr))) {
3410			dest_is_priv = 1;
3411		}
3412		break;
3413#endif
3414#ifdef INET6
3415	case AF_INET6:
3416		/* Scope based on outbound address */
3417		if (IN6_IS_ADDR_LOOPBACK(&to6->sin6_addr) ||
3418		    SCTP_ROUTE_IS_REAL_LOOP(ro)) {
3419			/*
3420			 * If the address is a loopback address, which
3421			 * consists of "::1" OR "fe80::1%lo0", we are
3422			 * loopback scope. But we don't use dest_is_priv
3423			 * (link local addresses).
3424			 */
3425			dest_is_loop = 1;
3426			if (net != NULL) {
3427				/* mark it as local */
3428				net->addr_is_local = 1;
3429			}
3430		} else if (IN6_IS_ADDR_LINKLOCAL(&to6->sin6_addr)) {
3431			dest_is_priv = 1;
3432		}
3433		break;
3434#endif
3435	}
3436	SCTPDBG(SCTP_DEBUG_OUTPUT2, "Select source addr for:");
3437	SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&ro->ro_dst);
3438	SCTP_IPI_ADDR_RLOCK();
3439	if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
3440		/*
3441		 * Bound all case
3442		 */
3443		answer = sctp_choose_boundall(inp, stcb, net, ro, vrf_id,
3444		    dest_is_priv, dest_is_loop,
3445		    non_asoc_addr_ok, fam);
3446		SCTP_IPI_ADDR_RUNLOCK();
3447		return (answer);
3448	}
3449	/*
3450	 * Subset bound case
3451	 */
3452	if (stcb) {
3453		answer = sctp_choose_boundspecific_stcb(inp, stcb, ro,
3454		    vrf_id, dest_is_priv,
3455		    dest_is_loop,
3456		    non_asoc_addr_ok, fam);
3457	} else {
3458		answer = sctp_choose_boundspecific_inp(inp, ro, vrf_id,
3459		    non_asoc_addr_ok,
3460		    dest_is_priv,
3461		    dest_is_loop, fam);
3462	}
3463	SCTP_IPI_ADDR_RUNLOCK();
3464	return (answer);
3465}
3466
3467static int
3468sctp_find_cmsg(int c_type, void *data, struct mbuf *control, size_t cpsize)
3469{
3470	struct cmsghdr cmh;
3471	struct sctp_sndinfo sndinfo;
3472	struct sctp_prinfo prinfo;
3473	struct sctp_authinfo authinfo;
3474	int tot_len, rem_len, cmsg_data_len, cmsg_data_off, off;
3475	int found;
3476
3477	/*
3478	 * Independent of how many mbufs, find the c_type inside the control
3479	 * structure and copy out the data.
3480	 */
3481	found = 0;
3482	tot_len = SCTP_BUF_LEN(control);
3483	for (off = 0; off < tot_len; off += CMSG_ALIGN(cmh.cmsg_len)) {
3484		rem_len = tot_len - off;
3485		if (rem_len < (int)CMSG_ALIGN(sizeof(cmh))) {
3486			/* There is not enough room for one more. */
3487			return (found);
3488		}
3489		m_copydata(control, off, sizeof(cmh), (caddr_t)&cmh);
3490		if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3491			/* We dont't have a complete CMSG header. */
3492			return (found);
3493		}
3494		if ((cmh.cmsg_len > INT_MAX) || ((int)cmh.cmsg_len > rem_len)) {
3495			/* We don't have the complete CMSG. */
3496			return (found);
3497		}
3498		cmsg_data_len = (int)cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh));
3499		cmsg_data_off = off + CMSG_ALIGN(sizeof(cmh));
3500		if ((cmh.cmsg_level == IPPROTO_SCTP) &&
3501		    ((c_type == cmh.cmsg_type) ||
3502		    ((c_type == SCTP_SNDRCV) &&
3503		    ((cmh.cmsg_type == SCTP_SNDINFO) ||
3504		    (cmh.cmsg_type == SCTP_PRINFO) ||
3505		    (cmh.cmsg_type == SCTP_AUTHINFO))))) {
3506			if (c_type == cmh.cmsg_type) {
3507				if (cpsize > INT_MAX) {
3508					return (found);
3509				}
3510				if (cmsg_data_len < (int)cpsize) {
3511					return (found);
3512				}
3513				/* It is exactly what we want. Copy it out. */
3514				m_copydata(control, cmsg_data_off, (int)cpsize, (caddr_t)data);
3515				return (1);
3516			} else {
3517				struct sctp_sndrcvinfo *sndrcvinfo;
3518
3519				sndrcvinfo = (struct sctp_sndrcvinfo *)data;
3520				if (found == 0) {
3521					if (cpsize < sizeof(struct sctp_sndrcvinfo)) {
3522						return (found);
3523					}
3524					memset(sndrcvinfo, 0, sizeof(struct sctp_sndrcvinfo));
3525				}
3526				switch (cmh.cmsg_type) {
3527				case SCTP_SNDINFO:
3528					if (cmsg_data_len < (int)sizeof(struct sctp_sndinfo)) {
3529						return (found);
3530					}
3531					m_copydata(control, cmsg_data_off, sizeof(struct sctp_sndinfo), (caddr_t)&sndinfo);
3532					sndrcvinfo->sinfo_stream = sndinfo.snd_sid;
3533					sndrcvinfo->sinfo_flags = sndinfo.snd_flags;
3534					sndrcvinfo->sinfo_ppid = sndinfo.snd_ppid;
3535					sndrcvinfo->sinfo_context = sndinfo.snd_context;
3536					sndrcvinfo->sinfo_assoc_id = sndinfo.snd_assoc_id;
3537					break;
3538				case SCTP_PRINFO:
3539					if (cmsg_data_len < (int)sizeof(struct sctp_prinfo)) {
3540						return (found);
3541					}
3542					m_copydata(control, cmsg_data_off, sizeof(struct sctp_prinfo), (caddr_t)&prinfo);
3543					if (prinfo.pr_policy != SCTP_PR_SCTP_NONE) {
3544						sndrcvinfo->sinfo_timetolive = prinfo.pr_value;
3545					} else {
3546						sndrcvinfo->sinfo_timetolive = 0;
3547					}
3548					sndrcvinfo->sinfo_flags |= prinfo.pr_policy;
3549					break;
3550				case SCTP_AUTHINFO:
3551					if (cmsg_data_len < (int)sizeof(struct sctp_authinfo)) {
3552						return (found);
3553					}
3554					m_copydata(control, cmsg_data_off, sizeof(struct sctp_authinfo), (caddr_t)&authinfo);
3555					sndrcvinfo->sinfo_keynumber_valid = 1;
3556					sndrcvinfo->sinfo_keynumber = authinfo.auth_keynumber;
3557					break;
3558				default:
3559					return (found);
3560				}
3561				found = 1;
3562			}
3563		}
3564	}
3565	return (found);
3566}
3567
3568static int
3569sctp_process_cmsgs_for_init(struct sctp_tcb *stcb, struct mbuf *control, int *error)
3570{
3571	struct cmsghdr cmh;
3572	struct sctp_initmsg initmsg;
3573#ifdef INET
3574	struct sockaddr_in sin;
3575#endif
3576#ifdef INET6
3577	struct sockaddr_in6 sin6;
3578#endif
3579	int tot_len, rem_len, cmsg_data_len, cmsg_data_off, off;
3580
3581	tot_len = SCTP_BUF_LEN(control);
3582	for (off = 0; off < tot_len; off += CMSG_ALIGN(cmh.cmsg_len)) {
3583		rem_len = tot_len - off;
3584		if (rem_len < (int)CMSG_ALIGN(sizeof(cmh))) {
3585			/* There is not enough room for one more. */
3586			*error = EINVAL;
3587			return (1);
3588		}
3589		m_copydata(control, off, sizeof(cmh), (caddr_t)&cmh);
3590		if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3591			/* We dont't have a complete CMSG header. */
3592			*error = EINVAL;
3593			return (1);
3594		}
3595		if ((cmh.cmsg_len > INT_MAX) || ((int)cmh.cmsg_len > rem_len)) {
3596			/* We don't have the complete CMSG. */
3597			*error = EINVAL;
3598			return (1);
3599		}
3600		cmsg_data_len = (int)cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh));
3601		cmsg_data_off = off + CMSG_ALIGN(sizeof(cmh));
3602		if (cmh.cmsg_level == IPPROTO_SCTP) {
3603			switch (cmh.cmsg_type) {
3604			case SCTP_INIT:
3605				if (cmsg_data_len < (int)sizeof(struct sctp_initmsg)) {
3606					*error = EINVAL;
3607					return (1);
3608				}
3609				m_copydata(control, cmsg_data_off, sizeof(struct sctp_initmsg), (caddr_t)&initmsg);
3610				if (initmsg.sinit_max_attempts)
3611					stcb->asoc.max_init_times = initmsg.sinit_max_attempts;
3612				if (initmsg.sinit_num_ostreams)
3613					stcb->asoc.pre_open_streams = initmsg.sinit_num_ostreams;
3614				if (initmsg.sinit_max_instreams)
3615					stcb->asoc.max_inbound_streams = initmsg.sinit_max_instreams;
3616				if (initmsg.sinit_max_init_timeo)
3617					stcb->asoc.initial_init_rto_max = initmsg.sinit_max_init_timeo;
3618				if (stcb->asoc.streamoutcnt < stcb->asoc.pre_open_streams) {
3619					struct sctp_stream_out *tmp_str;
3620					unsigned int i;
3621#if defined(SCTP_DETAILED_STR_STATS)
3622					int j;
3623#endif
3624
3625					/* Default is NOT correct */
3626					SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, default:%d pre_open:%d\n",
3627					    stcb->asoc.streamoutcnt, stcb->asoc.pre_open_streams);
3628					SCTP_TCB_UNLOCK(stcb);
3629					SCTP_MALLOC(tmp_str,
3630					    struct sctp_stream_out *,
3631					    (stcb->asoc.pre_open_streams * sizeof(struct sctp_stream_out)),
3632					    SCTP_M_STRMO);
3633					SCTP_TCB_LOCK(stcb);
3634					if (tmp_str != NULL) {
3635						SCTP_FREE(stcb->asoc.strmout, SCTP_M_STRMO);
3636						stcb->asoc.strmout = tmp_str;
3637						stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt = stcb->asoc.pre_open_streams;
3638					} else {
3639						stcb->asoc.pre_open_streams = stcb->asoc.streamoutcnt;
3640					}
3641					for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3642						TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
3643						stcb->asoc.strmout[i].chunks_on_queues = 0;
3644						stcb->asoc.strmout[i].next_mid_ordered = 0;
3645						stcb->asoc.strmout[i].next_mid_unordered = 0;
3646#if defined(SCTP_DETAILED_STR_STATS)
3647						for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
3648							stcb->asoc.strmout[i].abandoned_sent[j] = 0;
3649							stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
3650						}
3651#else
3652						stcb->asoc.strmout[i].abandoned_sent[0] = 0;
3653						stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
3654#endif
3655						stcb->asoc.strmout[i].sid = i;
3656						stcb->asoc.strmout[i].last_msg_incomplete = 0;
3657						stcb->asoc.strmout[i].state = SCTP_STREAM_OPENING;
3658						stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], NULL);
3659					}
3660				}
3661				break;
3662#ifdef INET
3663			case SCTP_DSTADDRV4:
3664				if (cmsg_data_len < (int)sizeof(struct in_addr)) {
3665					*error = EINVAL;
3666					return (1);
3667				}
3668				memset(&sin, 0, sizeof(struct sockaddr_in));
3669				sin.sin_family = AF_INET;
3670				sin.sin_len = sizeof(struct sockaddr_in);
3671				sin.sin_port = stcb->rport;
3672				m_copydata(control, cmsg_data_off, sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3673				if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3674				    (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3675				    IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3676					*error = EINVAL;
3677					return (1);
3678				}
3679				if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL, stcb->asoc.port,
3680				    SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3681					*error = ENOBUFS;
3682					return (1);
3683				}
3684				break;
3685#endif
3686#ifdef INET6
3687			case SCTP_DSTADDRV6:
3688				if (cmsg_data_len < (int)sizeof(struct in6_addr)) {
3689					*error = EINVAL;
3690					return (1);
3691				}
3692				memset(&sin6, 0, sizeof(struct sockaddr_in6));
3693				sin6.sin6_family = AF_INET6;
3694				sin6.sin6_len = sizeof(struct sockaddr_in6);
3695				sin6.sin6_port = stcb->rport;
3696				m_copydata(control, cmsg_data_off, sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3697				if (IN6_IS_ADDR_UNSPECIFIED(&sin6.sin6_addr) ||
3698				    IN6_IS_ADDR_MULTICAST(&sin6.sin6_addr)) {
3699					*error = EINVAL;
3700					return (1);
3701				}
3702#ifdef INET
3703				if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3704					in6_sin6_2_sin(&sin, &sin6);
3705					if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3706					    (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3707					    IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3708						*error = EINVAL;
3709						return (1);
3710					}
3711					if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL, stcb->asoc.port,
3712					    SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3713						*error = ENOBUFS;
3714						return (1);
3715					}
3716				} else
3717#endif
3718					if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin6, NULL, stcb->asoc.port,
3719				    SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3720					*error = ENOBUFS;
3721					return (1);
3722				}
3723				break;
3724#endif
3725			default:
3726				break;
3727			}
3728		}
3729	}
3730	return (0);
3731}
3732
3733static struct sctp_tcb *
3734sctp_findassociation_cmsgs(struct sctp_inpcb **inp_p,
3735    uint16_t port,
3736    struct mbuf *control,
3737    struct sctp_nets **net_p,
3738    int *error)
3739{
3740	struct cmsghdr cmh;
3741	struct sctp_tcb *stcb;
3742	struct sockaddr *addr;
3743#ifdef INET
3744	struct sockaddr_in sin;
3745#endif
3746#ifdef INET6
3747	struct sockaddr_in6 sin6;
3748#endif
3749	int tot_len, rem_len, cmsg_data_len, cmsg_data_off, off;
3750
3751	tot_len = SCTP_BUF_LEN(control);
3752	for (off = 0; off < tot_len; off += CMSG_ALIGN(cmh.cmsg_len)) {
3753		rem_len = tot_len - off;
3754		if (rem_len < (int)CMSG_ALIGN(sizeof(cmh))) {
3755			/* There is not enough room for one more. */
3756			*error = EINVAL;
3757			return (NULL);
3758		}
3759		m_copydata(control, off, sizeof(cmh), (caddr_t)&cmh);
3760		if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3761			/* We dont't have a complete CMSG header. */
3762			*error = EINVAL;
3763			return (NULL);
3764		}
3765		if ((cmh.cmsg_len > INT_MAX) || ((int)cmh.cmsg_len > rem_len)) {
3766			/* We don't have the complete CMSG. */
3767			*error = EINVAL;
3768			return (NULL);
3769		}
3770		cmsg_data_len = (int)cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh));
3771		cmsg_data_off = off + CMSG_ALIGN(sizeof(cmh));
3772		if (cmh.cmsg_level == IPPROTO_SCTP) {
3773			switch (cmh.cmsg_type) {
3774#ifdef INET
3775			case SCTP_DSTADDRV4:
3776				if (cmsg_data_len < (int)sizeof(struct in_addr)) {
3777					*error = EINVAL;
3778					return (NULL);
3779				}
3780				memset(&sin, 0, sizeof(struct sockaddr_in));
3781				sin.sin_family = AF_INET;
3782				sin.sin_len = sizeof(struct sockaddr_in);
3783				sin.sin_port = port;
3784				m_copydata(control, cmsg_data_off, sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3785				addr = (struct sockaddr *)&sin;
3786				break;
3787#endif
3788#ifdef INET6
3789			case SCTP_DSTADDRV6:
3790				if (cmsg_data_len < (int)sizeof(struct in6_addr)) {
3791					*error = EINVAL;
3792					return (NULL);
3793				}
3794				memset(&sin6, 0, sizeof(struct sockaddr_in6));
3795				sin6.sin6_family = AF_INET6;
3796				sin6.sin6_len = sizeof(struct sockaddr_in6);
3797				sin6.sin6_port = port;
3798				m_copydata(control, cmsg_data_off, sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3799#ifdef INET
3800				if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3801					in6_sin6_2_sin(&sin, &sin6);
3802					addr = (struct sockaddr *)&sin;
3803				} else
3804#endif
3805					addr = (struct sockaddr *)&sin6;
3806				break;
3807#endif
3808			default:
3809				addr = NULL;
3810				break;
3811			}
3812			if (addr) {
3813				stcb = sctp_findassociation_ep_addr(inp_p, addr, net_p, NULL, NULL);
3814				if (stcb != NULL) {
3815					return (stcb);
3816				}
3817			}
3818		}
3819	}
3820	return (NULL);
3821}
3822
3823static struct mbuf *
3824sctp_add_cookie(struct mbuf *init, int init_offset,
3825    struct mbuf *initack, int initack_offset, struct sctp_state_cookie *stc_in, uint8_t **signature)
3826{
3827	struct mbuf *copy_init, *copy_initack, *m_at, *sig, *mret;
3828	struct sctp_state_cookie *stc;
3829	struct sctp_paramhdr *ph;
3830	uint8_t *foo;
3831	int sig_offset;
3832	uint16_t cookie_sz;
3833
3834	mret = sctp_get_mbuf_for_msg((sizeof(struct sctp_state_cookie) +
3835	    sizeof(struct sctp_paramhdr)), 0,
3836	    M_NOWAIT, 1, MT_DATA);
3837	if (mret == NULL) {
3838		return (NULL);
3839	}
3840	copy_init = SCTP_M_COPYM(init, init_offset, M_COPYALL, M_NOWAIT);
3841	if (copy_init == NULL) {
3842		sctp_m_freem(mret);
3843		return (NULL);
3844	}
3845#ifdef SCTP_MBUF_LOGGING
3846	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3847		sctp_log_mbc(copy_init, SCTP_MBUF_ICOPY);
3848	}
3849#endif
3850	copy_initack = SCTP_M_COPYM(initack, initack_offset, M_COPYALL,
3851	    M_NOWAIT);
3852	if (copy_initack == NULL) {
3853		sctp_m_freem(mret);
3854		sctp_m_freem(copy_init);
3855		return (NULL);
3856	}
3857#ifdef SCTP_MBUF_LOGGING
3858	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3859		sctp_log_mbc(copy_initack, SCTP_MBUF_ICOPY);
3860	}
3861#endif
3862	/* easy side we just drop it on the end */
3863	ph = mtod(mret, struct sctp_paramhdr *);
3864	SCTP_BUF_LEN(mret) = sizeof(struct sctp_state_cookie) +
3865	    sizeof(struct sctp_paramhdr);
3866	stc = (struct sctp_state_cookie *)((caddr_t)ph +
3867	    sizeof(struct sctp_paramhdr));
3868	ph->param_type = htons(SCTP_STATE_COOKIE);
3869	ph->param_length = 0;	/* fill in at the end */
3870	/* Fill in the stc cookie data */
3871	memcpy(stc, stc_in, sizeof(struct sctp_state_cookie));
3872
3873	/* tack the INIT and then the INIT-ACK onto the chain */
3874	cookie_sz = 0;
3875	for (m_at = mret; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3876		cookie_sz += SCTP_BUF_LEN(m_at);
3877		if (SCTP_BUF_NEXT(m_at) == NULL) {
3878			SCTP_BUF_NEXT(m_at) = copy_init;
3879			break;
3880		}
3881	}
3882	for (m_at = copy_init; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3883		cookie_sz += SCTP_BUF_LEN(m_at);
3884		if (SCTP_BUF_NEXT(m_at) == NULL) {
3885			SCTP_BUF_NEXT(m_at) = copy_initack;
3886			break;
3887		}
3888	}
3889	for (m_at = copy_initack; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3890		cookie_sz += SCTP_BUF_LEN(m_at);
3891		if (SCTP_BUF_NEXT(m_at) == NULL) {
3892			break;
3893		}
3894	}
3895	sig = sctp_get_mbuf_for_msg(SCTP_SECRET_SIZE, 0, M_NOWAIT, 1, MT_DATA);
3896	if (sig == NULL) {
3897		/* no space, so free the entire chain */
3898		sctp_m_freem(mret);
3899		return (NULL);
3900	}
3901	SCTP_BUF_LEN(sig) = 0;
3902	SCTP_BUF_NEXT(m_at) = sig;
3903	sig_offset = 0;
3904	foo = (uint8_t *)(mtod(sig, caddr_t)+sig_offset);
3905	memset(foo, 0, SCTP_SIGNATURE_SIZE);
3906	*signature = foo;
3907	SCTP_BUF_LEN(sig) += SCTP_SIGNATURE_SIZE;
3908	cookie_sz += SCTP_SIGNATURE_SIZE;
3909	ph->param_length = htons(cookie_sz);
3910	return (mret);
3911}
3912
3913
3914static uint8_t
3915sctp_get_ect(struct sctp_tcb *stcb)
3916{
3917	if ((stcb != NULL) && (stcb->asoc.ecn_supported == 1)) {
3918		return (SCTP_ECT0_BIT);
3919	} else {
3920		return (0);
3921	}
3922}
3923
3924#if defined(INET) || defined(INET6)
3925static void
3926sctp_handle_no_route(struct sctp_tcb *stcb,
3927    struct sctp_nets *net,
3928    int so_locked)
3929{
3930	SCTPDBG(SCTP_DEBUG_OUTPUT1, "dropped packet - no valid source addr\n");
3931
3932	if (net) {
3933		SCTPDBG(SCTP_DEBUG_OUTPUT1, "Destination was ");
3934		SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT1, &net->ro._l_addr.sa);
3935		if (net->dest_state & SCTP_ADDR_CONFIRMED) {
3936			if ((net->dest_state & SCTP_ADDR_REACHABLE) && stcb) {
3937				SCTPDBG(SCTP_DEBUG_OUTPUT1, "no route takes interface %p down\n", (void *)net);
3938				sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
3939				    stcb, 0,
3940				    (void *)net,
3941				    so_locked);
3942				net->dest_state &= ~SCTP_ADDR_REACHABLE;
3943				net->dest_state &= ~SCTP_ADDR_PF;
3944			}
3945		}
3946		if (stcb) {
3947			if (net == stcb->asoc.primary_destination) {
3948				/* need a new primary */
3949				struct sctp_nets *alt;
3950
3951				alt = sctp_find_alternate_net(stcb, net, 0);
3952				if (alt != net) {
3953					if (stcb->asoc.alternate) {
3954						sctp_free_remote_addr(stcb->asoc.alternate);
3955					}
3956					stcb->asoc.alternate = alt;
3957					atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
3958					if (net->ro._s_addr) {
3959						sctp_free_ifa(net->ro._s_addr);
3960						net->ro._s_addr = NULL;
3961					}
3962					net->src_addr_selected = 0;
3963				}
3964			}
3965		}
3966	}
3967}
3968#endif
3969
3970static int
3971sctp_lowlevel_chunk_output(struct sctp_inpcb *inp,
3972    struct sctp_tcb *stcb,	/* may be NULL */
3973    struct sctp_nets *net,
3974    struct sockaddr *to,
3975    struct mbuf *m,
3976    uint32_t auth_offset,
3977    struct sctp_auth_chunk *auth,
3978    uint16_t auth_keyid,
3979    int nofragment_flag,
3980    int ecn_ok,
3981    int out_of_asoc_ok,
3982    uint16_t src_port,
3983    uint16_t dest_port,
3984    uint32_t v_tag,
3985    uint16_t port,
3986    union sctp_sockstore *over_addr,
3987    uint8_t mflowtype, uint32_t mflowid,
3988#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
3989    int so_locked SCTP_UNUSED
3990#else
3991    int so_locked
3992#endif
3993)
3994{
3995/* nofragment_flag to tell if IP_DF should be set (IPv4 only) */
3996	/**
3997	 * Given a mbuf chain (via SCTP_BUF_NEXT()) that holds a packet header
3998	 * WITH an SCTPHDR but no IP header, endpoint inp and sa structure:
3999	 * - fill in the HMAC digest of any AUTH chunk in the packet.
4000	 * - calculate and fill in the SCTP checksum.
4001	 * - prepend an IP address header.
4002	 * - if boundall use INADDR_ANY.
4003	 * - if boundspecific do source address selection.
4004	 * - set fragmentation option for ipV4.
4005	 * - On return from IP output, check/adjust mtu size of output
4006	 *   interface and smallest_mtu size as well.
4007	 */
4008	/* Will need ifdefs around this */
4009	struct mbuf *newm;
4010	struct sctphdr *sctphdr;
4011	int packet_length;
4012	int ret;
4013#if defined(INET) || defined(INET6)
4014	uint32_t vrf_id;
4015#endif
4016#if defined(INET) || defined(INET6)
4017	struct mbuf *o_pak;
4018	sctp_route_t *ro = NULL;
4019	struct udphdr *udp = NULL;
4020#endif
4021	uint8_t tos_value;
4022#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4023	struct socket *so = NULL;
4024#endif
4025
4026	if ((net) && (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)) {
4027		SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4028		sctp_m_freem(m);
4029		return (EFAULT);
4030	}
4031#if defined(INET) || defined(INET6)
4032	if (stcb) {
4033		vrf_id = stcb->asoc.vrf_id;
4034	} else {
4035		vrf_id = inp->def_vrf_id;
4036	}
4037#endif
4038	/* fill in the HMAC digest for any AUTH chunk in the packet */
4039	if ((auth != NULL) && (stcb != NULL)) {
4040		sctp_fill_hmac_digest_m(m, auth_offset, auth, stcb, auth_keyid);
4041	}
4042
4043	if (net) {
4044		tos_value = net->dscp;
4045	} else if (stcb) {
4046		tos_value = stcb->asoc.default_dscp;
4047	} else {
4048		tos_value = inp->sctp_ep.default_dscp;
4049	}
4050
4051	switch (to->sa_family) {
4052#ifdef INET
4053	case AF_INET:
4054		{
4055			struct ip *ip = NULL;
4056			sctp_route_t iproute;
4057			int len;
4058
4059			len = SCTP_MIN_V4_OVERHEAD;
4060			if (port) {
4061				len += sizeof(struct udphdr);
4062			}
4063			newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4064			if (newm == NULL) {
4065				sctp_m_freem(m);
4066				SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4067				return (ENOMEM);
4068			}
4069			SCTP_ALIGN_TO_END(newm, len);
4070			SCTP_BUF_LEN(newm) = len;
4071			SCTP_BUF_NEXT(newm) = m;
4072			m = newm;
4073			if (net != NULL) {
4074				m->m_pkthdr.flowid = net->flowid;
4075				M_HASHTYPE_SET(m, net->flowtype);
4076			} else {
4077				m->m_pkthdr.flowid = mflowid;
4078				M_HASHTYPE_SET(m, mflowtype);
4079			}
4080			packet_length = sctp_calculate_len(m);
4081			ip = mtod(m, struct ip *);
4082			ip->ip_v = IPVERSION;
4083			ip->ip_hl = (sizeof(struct ip) >> 2);
4084			if (tos_value == 0) {
4085				/*
4086				 * This means especially, that it is not set
4087				 * at the SCTP layer. So use the value from
4088				 * the IP layer.
4089				 */
4090				tos_value = inp->ip_inp.inp.inp_ip_tos;
4091			}
4092			tos_value &= 0xfc;
4093			if (ecn_ok) {
4094				tos_value |= sctp_get_ect(stcb);
4095			}
4096			if ((nofragment_flag) && (port == 0)) {
4097				ip->ip_off = htons(IP_DF);
4098			} else {
4099				ip->ip_off = htons(0);
4100			}
4101			/* FreeBSD has a function for ip_id's */
4102			ip_fillid(ip);
4103
4104			ip->ip_ttl = inp->ip_inp.inp.inp_ip_ttl;
4105			ip->ip_len = htons(packet_length);
4106			ip->ip_tos = tos_value;
4107			if (port) {
4108				ip->ip_p = IPPROTO_UDP;
4109			} else {
4110				ip->ip_p = IPPROTO_SCTP;
4111			}
4112			ip->ip_sum = 0;
4113			if (net == NULL) {
4114				ro = &iproute;
4115				memset(&iproute, 0, sizeof(iproute));
4116				memcpy(&ro->ro_dst, to, to->sa_len);
4117			} else {
4118				ro = (sctp_route_t *)&net->ro;
4119			}
4120			/* Now the address selection part */
4121			ip->ip_dst.s_addr = ((struct sockaddr_in *)to)->sin_addr.s_addr;
4122
4123			/* call the routine to select the src address */
4124			if (net && out_of_asoc_ok == 0) {
4125				if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4126					sctp_free_ifa(net->ro._s_addr);
4127					net->ro._s_addr = NULL;
4128					net->src_addr_selected = 0;
4129					if (ro->ro_rt) {
4130						RTFREE(ro->ro_rt);
4131						ro->ro_rt = NULL;
4132					}
4133				}
4134				if (net->src_addr_selected == 0) {
4135					/* Cache the source address */
4136					net->ro._s_addr = sctp_source_address_selection(inp, stcb,
4137					    ro, net, 0,
4138					    vrf_id);
4139					net->src_addr_selected = 1;
4140				}
4141				if (net->ro._s_addr == NULL) {
4142					/* No route to host */
4143					net->src_addr_selected = 0;
4144					sctp_handle_no_route(stcb, net, so_locked);
4145					SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4146					sctp_m_freem(m);
4147					return (EHOSTUNREACH);
4148				}
4149				ip->ip_src = net->ro._s_addr->address.sin.sin_addr;
4150			} else {
4151				if (over_addr == NULL) {
4152					struct sctp_ifa *_lsrc;
4153
4154					_lsrc = sctp_source_address_selection(inp, stcb, ro,
4155					    net,
4156					    out_of_asoc_ok,
4157					    vrf_id);
4158					if (_lsrc == NULL) {
4159						sctp_handle_no_route(stcb, net, so_locked);
4160						SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4161						sctp_m_freem(m);
4162						return (EHOSTUNREACH);
4163					}
4164					ip->ip_src = _lsrc->address.sin.sin_addr;
4165					sctp_free_ifa(_lsrc);
4166				} else {
4167					ip->ip_src = over_addr->sin.sin_addr;
4168					SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
4169				}
4170			}
4171			if (port) {
4172				if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4173					sctp_handle_no_route(stcb, net, so_locked);
4174					SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4175					sctp_m_freem(m);
4176					return (EHOSTUNREACH);
4177				}
4178				udp = (struct udphdr *)((caddr_t)ip + sizeof(struct ip));
4179				udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4180				udp->uh_dport = port;
4181				udp->uh_ulen = htons((uint16_t)(packet_length - sizeof(struct ip)));
4182				if (V_udp_cksum) {
4183					udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
4184				} else {
4185					udp->uh_sum = 0;
4186				}
4187				sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4188			} else {
4189				sctphdr = (struct sctphdr *)((caddr_t)ip + sizeof(struct ip));
4190			}
4191
4192			sctphdr->src_port = src_port;
4193			sctphdr->dest_port = dest_port;
4194			sctphdr->v_tag = v_tag;
4195			sctphdr->checksum = 0;
4196
4197			/*
4198			 * If source address selection fails and we find no
4199			 * route then the ip_output should fail as well with
4200			 * a NO_ROUTE_TO_HOST type error. We probably should
4201			 * catch that somewhere and abort the association
4202			 * right away (assuming this is an INIT being sent).
4203			 */
4204			if (ro->ro_rt == NULL) {
4205				/*
4206				 * src addr selection failed to find a route
4207				 * (or valid source addr), so we can't get
4208				 * there from here (yet)!
4209				 */
4210				sctp_handle_no_route(stcb, net, so_locked);
4211				SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4212				sctp_m_freem(m);
4213				return (EHOSTUNREACH);
4214			}
4215			if (ro != &iproute) {
4216				memcpy(&iproute, ro, sizeof(*ro));
4217			}
4218			SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv4 output routine from low level src addr:%x\n",
4219			    (uint32_t)(ntohl(ip->ip_src.s_addr)));
4220			SCTPDBG(SCTP_DEBUG_OUTPUT3, "Destination is %x\n",
4221			    (uint32_t)(ntohl(ip->ip_dst.s_addr)));
4222			SCTPDBG(SCTP_DEBUG_OUTPUT3, "RTP route is %p through\n",
4223			    (void *)ro->ro_rt);
4224
4225			if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4226				/* failed to prepend data, give up */
4227				SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4228				sctp_m_freem(m);
4229				return (ENOMEM);
4230			}
4231			SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4232			if (port) {
4233				sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip) + sizeof(struct udphdr));
4234				SCTP_STAT_INCR(sctps_sendswcrc);
4235				if (V_udp_cksum) {
4236					SCTP_ENABLE_UDP_CSUM(o_pak);
4237				}
4238			} else {
4239				m->m_pkthdr.csum_flags = CSUM_SCTP;
4240				m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4241				SCTP_STAT_INCR(sctps_sendhwcrc);
4242			}
4243#ifdef SCTP_PACKET_LOGGING
4244			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4245				sctp_packet_log(o_pak);
4246#endif
4247			/* send it out.  table id is taken from stcb */
4248#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4249			if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4250				so = SCTP_INP_SO(inp);
4251				SCTP_SOCKET_UNLOCK(so, 0);
4252			}
4253#endif
4254			SCTP_IP_OUTPUT(ret, o_pak, ro, stcb, vrf_id);
4255#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4256			if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4257				atomic_add_int(&stcb->asoc.refcnt, 1);
4258				SCTP_TCB_UNLOCK(stcb);
4259				SCTP_SOCKET_LOCK(so, 0);
4260				SCTP_TCB_LOCK(stcb);
4261				atomic_subtract_int(&stcb->asoc.refcnt, 1);
4262			}
4263#endif
4264			if (port) {
4265				UDPSTAT_INC(udps_opackets);
4266			}
4267			SCTP_STAT_INCR(sctps_sendpackets);
4268			SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4269			if (ret)
4270				SCTP_STAT_INCR(sctps_senderrors);
4271
4272			SCTPDBG(SCTP_DEBUG_OUTPUT3, "IP output returns %d\n", ret);
4273			if (net == NULL) {
4274				/* free tempy routes */
4275				RO_RTFREE(ro);
4276			} else {
4277				if ((ro->ro_rt != NULL) && (net->ro._s_addr) &&
4278				    ((net->dest_state & SCTP_ADDR_NO_PMTUD) == 0)) {
4279					uint32_t mtu;
4280
4281					mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4282					if (mtu > 0) {
4283						if (net->port) {
4284							mtu -= sizeof(struct udphdr);
4285						}
4286						if (mtu < net->mtu) {
4287							if ((stcb != NULL) && (stcb->asoc.smallest_mtu > mtu)) {
4288								sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4289							}
4290							net->mtu = mtu;
4291						}
4292					}
4293				} else if (ro->ro_rt == NULL) {
4294					/* route was freed */
4295					if (net->ro._s_addr &&
4296					    net->src_addr_selected) {
4297						sctp_free_ifa(net->ro._s_addr);
4298						net->ro._s_addr = NULL;
4299					}
4300					net->src_addr_selected = 0;
4301				}
4302			}
4303			return (ret);
4304		}
4305#endif
4306#ifdef INET6
4307	case AF_INET6:
4308		{
4309			uint32_t flowlabel, flowinfo;
4310			struct ip6_hdr *ip6h;
4311			struct route_in6 ip6route;
4312			struct ifnet *ifp;
4313			struct sockaddr_in6 *sin6, tmp, *lsa6, lsa6_tmp;
4314			int prev_scope = 0;
4315			struct sockaddr_in6 lsa6_storage;
4316			int error;
4317			u_short prev_port = 0;
4318			int len;
4319
4320			if (net) {
4321				flowlabel = net->flowlabel;
4322			} else if (stcb) {
4323				flowlabel = stcb->asoc.default_flowlabel;
4324			} else {
4325				flowlabel = inp->sctp_ep.default_flowlabel;
4326			}
4327			if (flowlabel == 0) {
4328				/*
4329				 * This means especially, that it is not set
4330				 * at the SCTP layer. So use the value from
4331				 * the IP layer.
4332				 */
4333				flowlabel = ntohl(((struct in6pcb *)inp)->in6p_flowinfo);
4334			}
4335			flowlabel &= 0x000fffff;
4336			len = SCTP_MIN_OVERHEAD;
4337			if (port) {
4338				len += sizeof(struct udphdr);
4339			}
4340			newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4341			if (newm == NULL) {
4342				sctp_m_freem(m);
4343				SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4344				return (ENOMEM);
4345			}
4346			SCTP_ALIGN_TO_END(newm, len);
4347			SCTP_BUF_LEN(newm) = len;
4348			SCTP_BUF_NEXT(newm) = m;
4349			m = newm;
4350			if (net != NULL) {
4351				m->m_pkthdr.flowid = net->flowid;
4352				M_HASHTYPE_SET(m, net->flowtype);
4353			} else {
4354				m->m_pkthdr.flowid = mflowid;
4355				M_HASHTYPE_SET(m, mflowtype);
4356			}
4357			packet_length = sctp_calculate_len(m);
4358
4359			ip6h = mtod(m, struct ip6_hdr *);
4360			/* protect *sin6 from overwrite */
4361			sin6 = (struct sockaddr_in6 *)to;
4362			tmp = *sin6;
4363			sin6 = &tmp;
4364
4365			/* KAME hack: embed scopeid */
4366			if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4367				SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4368				sctp_m_freem(m);
4369				return (EINVAL);
4370			}
4371			if (net == NULL) {
4372				memset(&ip6route, 0, sizeof(ip6route));
4373				ro = (sctp_route_t *)&ip6route;
4374				memcpy(&ro->ro_dst, sin6, sin6->sin6_len);
4375			} else {
4376				ro = (sctp_route_t *)&net->ro;
4377			}
4378			/*
4379			 * We assume here that inp_flow is in host byte
4380			 * order within the TCB!
4381			 */
4382			if (tos_value == 0) {
4383				/*
4384				 * This means especially, that it is not set
4385				 * at the SCTP layer. So use the value from
4386				 * the IP layer.
4387				 */
4388				tos_value = (ntohl(((struct in6pcb *)inp)->in6p_flowinfo) >> 20) & 0xff;
4389			}
4390			tos_value &= 0xfc;
4391			if (ecn_ok) {
4392				tos_value |= sctp_get_ect(stcb);
4393			}
4394			flowinfo = 0x06;
4395			flowinfo <<= 8;
4396			flowinfo |= tos_value;
4397			flowinfo <<= 20;
4398			flowinfo |= flowlabel;
4399			ip6h->ip6_flow = htonl(flowinfo);
4400			if (port) {
4401				ip6h->ip6_nxt = IPPROTO_UDP;
4402			} else {
4403				ip6h->ip6_nxt = IPPROTO_SCTP;
4404			}
4405			ip6h->ip6_plen = htons((uint16_t)(packet_length - sizeof(struct ip6_hdr)));
4406			ip6h->ip6_dst = sin6->sin6_addr;
4407
4408			/*
4409			 * Add SRC address selection here: we can only reuse
4410			 * to a limited degree the kame src-addr-sel, since
4411			 * we can try their selection but it may not be
4412			 * bound.
4413			 */
4414			memset(&lsa6_tmp, 0, sizeof(lsa6_tmp));
4415			lsa6_tmp.sin6_family = AF_INET6;
4416			lsa6_tmp.sin6_len = sizeof(lsa6_tmp);
4417			lsa6 = &lsa6_tmp;
4418			if (net && out_of_asoc_ok == 0) {
4419				if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4420					sctp_free_ifa(net->ro._s_addr);
4421					net->ro._s_addr = NULL;
4422					net->src_addr_selected = 0;
4423					if (ro->ro_rt) {
4424						RTFREE(ro->ro_rt);
4425						ro->ro_rt = NULL;
4426					}
4427				}
4428				if (net->src_addr_selected == 0) {
4429					sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4430					/* KAME hack: embed scopeid */
4431					if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4432						SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4433						sctp_m_freem(m);
4434						return (EINVAL);
4435					}
4436					/* Cache the source address */
4437					net->ro._s_addr = sctp_source_address_selection(inp,
4438					    stcb,
4439					    ro,
4440					    net,
4441					    0,
4442					    vrf_id);
4443					(void)sa6_recoverscope(sin6);
4444					net->src_addr_selected = 1;
4445				}
4446				if (net->ro._s_addr == NULL) {
4447					SCTPDBG(SCTP_DEBUG_OUTPUT3, "V6:No route to host\n");
4448					net->src_addr_selected = 0;
4449					sctp_handle_no_route(stcb, net, so_locked);
4450					SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4451					sctp_m_freem(m);
4452					return (EHOSTUNREACH);
4453				}
4454				lsa6->sin6_addr = net->ro._s_addr->address.sin6.sin6_addr;
4455			} else {
4456				sin6 = (struct sockaddr_in6 *)&ro->ro_dst;
4457				/* KAME hack: embed scopeid */
4458				if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4459					SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4460					sctp_m_freem(m);
4461					return (EINVAL);
4462				}
4463				if (over_addr == NULL) {
4464					struct sctp_ifa *_lsrc;
4465
4466					_lsrc = sctp_source_address_selection(inp, stcb, ro,
4467					    net,
4468					    out_of_asoc_ok,
4469					    vrf_id);
4470					if (_lsrc == NULL) {
4471						sctp_handle_no_route(stcb, net, so_locked);
4472						SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4473						sctp_m_freem(m);
4474						return (EHOSTUNREACH);
4475					}
4476					lsa6->sin6_addr = _lsrc->address.sin6.sin6_addr;
4477					sctp_free_ifa(_lsrc);
4478				} else {
4479					lsa6->sin6_addr = over_addr->sin6.sin6_addr;
4480					SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
4481				}
4482				(void)sa6_recoverscope(sin6);
4483			}
4484			lsa6->sin6_port = inp->sctp_lport;
4485
4486			if (ro->ro_rt == NULL) {
4487				/*
4488				 * src addr selection failed to find a route
4489				 * (or valid source addr), so we can't get
4490				 * there from here!
4491				 */
4492				sctp_handle_no_route(stcb, net, so_locked);
4493				SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4494				sctp_m_freem(m);
4495				return (EHOSTUNREACH);
4496			}
4497			/*
4498			 * XXX: sa6 may not have a valid sin6_scope_id in
4499			 * the non-SCOPEDROUTING case.
4500			 */
4501			memset(&lsa6_storage, 0, sizeof(lsa6_storage));
4502			lsa6_storage.sin6_family = AF_INET6;
4503			lsa6_storage.sin6_len = sizeof(lsa6_storage);
4504			lsa6_storage.sin6_addr = lsa6->sin6_addr;
4505			if ((error = sa6_recoverscope(&lsa6_storage)) != 0) {
4506				SCTPDBG(SCTP_DEBUG_OUTPUT3, "recover scope fails error %d\n", error);
4507				sctp_m_freem(m);
4508				return (error);
4509			}
4510			/* XXX */
4511			lsa6_storage.sin6_addr = lsa6->sin6_addr;
4512			lsa6_storage.sin6_port = inp->sctp_lport;
4513			lsa6 = &lsa6_storage;
4514			ip6h->ip6_src = lsa6->sin6_addr;
4515
4516			if (port) {
4517				if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4518					sctp_handle_no_route(stcb, net, so_locked);
4519					SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4520					sctp_m_freem(m);
4521					return (EHOSTUNREACH);
4522				}
4523				udp = (struct udphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4524				udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4525				udp->uh_dport = port;
4526				udp->uh_ulen = htons((uint16_t)(packet_length - sizeof(struct ip6_hdr)));
4527				udp->uh_sum = 0;
4528				sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4529			} else {
4530				sctphdr = (struct sctphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4531			}
4532
4533			sctphdr->src_port = src_port;
4534			sctphdr->dest_port = dest_port;
4535			sctphdr->v_tag = v_tag;
4536			sctphdr->checksum = 0;
4537
4538			/*
4539			 * We set the hop limit now since there is a good
4540			 * chance that our ro pointer is now filled
4541			 */
4542			ip6h->ip6_hlim = SCTP_GET_HLIM(inp, ro);
4543			ifp = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
4544
4545#ifdef SCTP_DEBUG
4546			/* Copy to be sure something bad is not happening */
4547			sin6->sin6_addr = ip6h->ip6_dst;
4548			lsa6->sin6_addr = ip6h->ip6_src;
4549#endif
4550
4551			SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv6 output routine from low level\n");
4552			SCTPDBG(SCTP_DEBUG_OUTPUT3, "src: ");
4553			SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)lsa6);
4554			SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst: ");
4555			SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)sin6);
4556			if (net) {
4557				sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4558				/*
4559				 * preserve the port and scope for link
4560				 * local send
4561				 */
4562				prev_scope = sin6->sin6_scope_id;
4563				prev_port = sin6->sin6_port;
4564			}
4565
4566			if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4567				/* failed to prepend data, give up */
4568				sctp_m_freem(m);
4569				SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4570				return (ENOMEM);
4571			}
4572			SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4573			if (port) {
4574				sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
4575				SCTP_STAT_INCR(sctps_sendswcrc);
4576				if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), packet_length - sizeof(struct ip6_hdr))) == 0) {
4577					udp->uh_sum = 0xffff;
4578				}
4579			} else {
4580				m->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
4581				m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4582				SCTP_STAT_INCR(sctps_sendhwcrc);
4583			}
4584			/* send it out. table id is taken from stcb */
4585#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4586			if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4587				so = SCTP_INP_SO(inp);
4588				SCTP_SOCKET_UNLOCK(so, 0);
4589			}
4590#endif
4591#ifdef SCTP_PACKET_LOGGING
4592			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4593				sctp_packet_log(o_pak);
4594#endif
4595			SCTP_IP6_OUTPUT(ret, o_pak, (struct route_in6 *)ro, &ifp, stcb, vrf_id);
4596#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4597			if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4598				atomic_add_int(&stcb->asoc.refcnt, 1);
4599				SCTP_TCB_UNLOCK(stcb);
4600				SCTP_SOCKET_LOCK(so, 0);
4601				SCTP_TCB_LOCK(stcb);
4602				atomic_subtract_int(&stcb->asoc.refcnt, 1);
4603			}
4604#endif
4605			if (net) {
4606				/* for link local this must be done */
4607				sin6->sin6_scope_id = prev_scope;
4608				sin6->sin6_port = prev_port;
4609			}
4610			SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
4611			if (port) {
4612				UDPSTAT_INC(udps_opackets);
4613			}
4614			SCTP_STAT_INCR(sctps_sendpackets);
4615			SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4616			if (ret) {
4617				SCTP_STAT_INCR(sctps_senderrors);
4618			}
4619			if (net == NULL) {
4620				/* Now if we had a temp route free it */
4621				RO_RTFREE(ro);
4622			} else {
4623				/*
4624				 * PMTU check versus smallest asoc MTU goes
4625				 * here
4626				 */
4627				if (ro->ro_rt == NULL) {
4628					/* Route was freed */
4629					if (net->ro._s_addr &&
4630					    net->src_addr_selected) {
4631						sctp_free_ifa(net->ro._s_addr);
4632						net->ro._s_addr = NULL;
4633					}
4634					net->src_addr_selected = 0;
4635				}
4636				if ((ro->ro_rt != NULL) && (net->ro._s_addr) &&
4637				    ((net->dest_state & SCTP_ADDR_NO_PMTUD) == 0)) {
4638					uint32_t mtu;
4639
4640					mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4641					if (mtu > 0) {
4642						if (net->port) {
4643							mtu -= sizeof(struct udphdr);
4644						}
4645						if (mtu < net->mtu) {
4646							if ((stcb != NULL) && (stcb->asoc.smallest_mtu > mtu)) {
4647								sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4648							}
4649							net->mtu = mtu;
4650						}
4651					}
4652				} else if (ifp) {
4653					if (ND_IFINFO(ifp)->linkmtu &&
4654					    (stcb->asoc.smallest_mtu > ND_IFINFO(ifp)->linkmtu)) {
4655						sctp_mtu_size_reset(inp,
4656						    &stcb->asoc,
4657						    ND_IFINFO(ifp)->linkmtu);
4658					}
4659				}
4660			}
4661			return (ret);
4662		}
4663#endif
4664	default:
4665		SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
4666		    ((struct sockaddr *)to)->sa_family);
4667		sctp_m_freem(m);
4668		SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4669		return (EFAULT);
4670	}
4671}
4672
4673
4674void
4675sctp_send_initiate(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int so_locked
4676#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
4677    SCTP_UNUSED
4678#endif
4679)
4680{
4681	struct mbuf *m, *m_last;
4682	struct sctp_nets *net;
4683	struct sctp_init_chunk *init;
4684	struct sctp_supported_addr_param *sup_addr;
4685	struct sctp_adaptation_layer_indication *ali;
4686	struct sctp_supported_chunk_types_param *pr_supported;
4687	struct sctp_paramhdr *ph;
4688	int cnt_inits_to = 0;
4689	int error;
4690	uint16_t num_ext, chunk_len, padding_len, parameter_len;
4691
4692	/* INIT's always go to the primary (and usually ONLY address) */
4693	net = stcb->asoc.primary_destination;
4694	if (net == NULL) {
4695		net = TAILQ_FIRST(&stcb->asoc.nets);
4696		if (net == NULL) {
4697			/* TSNH */
4698			return;
4699		}
4700		/* we confirm any address we send an INIT to */
4701		net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4702		(void)sctp_set_primary_addr(stcb, NULL, net);
4703	} else {
4704		/* we confirm any address we send an INIT to */
4705		net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4706	}
4707	SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
4708#ifdef INET6
4709	if (net->ro._l_addr.sa.sa_family == AF_INET6) {
4710		/*
4711		 * special hook, if we are sending to link local it will not
4712		 * show up in our private address count.
4713		 */
4714		if (IN6_IS_ADDR_LINKLOCAL(&net->ro._l_addr.sin6.sin6_addr))
4715			cnt_inits_to = 1;
4716	}
4717#endif
4718	if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4719		/* This case should not happen */
4720		SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
4721		return;
4722	}
4723	/* start the INIT timer */
4724	sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
4725
4726	m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_NOWAIT, 1, MT_DATA);
4727	if (m == NULL) {
4728		/* No memory, INIT timer will re-attempt. */
4729		SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
4730		return;
4731	}
4732	chunk_len = (uint16_t)sizeof(struct sctp_init_chunk);
4733	padding_len = 0;
4734	/* Now lets put the chunk header in place */
4735	init = mtod(m, struct sctp_init_chunk *);
4736	/* now the chunk header */
4737	init->ch.chunk_type = SCTP_INITIATION;
4738	init->ch.chunk_flags = 0;
4739	/* fill in later from mbuf we build */
4740	init->ch.chunk_length = 0;
4741	/* place in my tag */
4742	init->init.initiate_tag = htonl(stcb->asoc.my_vtag);
4743	/* set up some of the credits. */
4744	init->init.a_rwnd = htonl(max(inp->sctp_socket ? SCTP_SB_LIMIT_RCV(inp->sctp_socket) : 0,
4745	    SCTP_MINIMAL_RWND));
4746	init->init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
4747	init->init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
4748	init->init.initial_tsn = htonl(stcb->asoc.init_seq_number);
4749
4750	/* Adaptation layer indication parameter */
4751	if (inp->sctp_ep.adaptation_layer_indicator_provided) {
4752		parameter_len = (uint16_t)sizeof(struct sctp_adaptation_layer_indication);
4753		ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
4754		ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
4755		ali->ph.param_length = htons(parameter_len);
4756		ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
4757		chunk_len += parameter_len;
4758	}
4759
4760	/* ECN parameter */
4761	if (stcb->asoc.ecn_supported == 1) {
4762		parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4763		ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4764		ph->param_type = htons(SCTP_ECN_CAPABLE);
4765		ph->param_length = htons(parameter_len);
4766		chunk_len += parameter_len;
4767	}
4768
4769	/* PR-SCTP supported parameter */
4770	if (stcb->asoc.prsctp_supported == 1) {
4771		parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4772		ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4773		ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
4774		ph->param_length = htons(parameter_len);
4775		chunk_len += parameter_len;
4776	}
4777
4778	/* Add NAT friendly parameter. */
4779	if (SCTP_BASE_SYSCTL(sctp_inits_include_nat_friendly)) {
4780		parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4781		ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4782		ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
4783		ph->param_length = htons(parameter_len);
4784		chunk_len += parameter_len;
4785	}
4786
4787	/* And now tell the peer which extensions we support */
4788	num_ext = 0;
4789	pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
4790	if (stcb->asoc.prsctp_supported == 1) {
4791		pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
4792		if (stcb->asoc.idata_supported) {
4793			pr_supported->chunk_types[num_ext++] = SCTP_IFORWARD_CUM_TSN;
4794		}
4795	}
4796	if (stcb->asoc.auth_supported == 1) {
4797		pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
4798	}
4799	if (stcb->asoc.asconf_supported == 1) {
4800		pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
4801		pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
4802	}
4803	if (stcb->asoc.reconfig_supported == 1) {
4804		pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
4805	}
4806	if (stcb->asoc.idata_supported) {
4807		pr_supported->chunk_types[num_ext++] = SCTP_IDATA;
4808	}
4809	if (stcb->asoc.nrsack_supported == 1) {
4810		pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
4811	}
4812	if (stcb->asoc.pktdrop_supported == 1) {
4813		pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
4814	}
4815	if (num_ext > 0) {
4816		parameter_len = (uint16_t)sizeof(struct sctp_supported_chunk_types_param) + num_ext;
4817		pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
4818		pr_supported->ph.param_length = htons(parameter_len);
4819		padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4820		chunk_len += parameter_len;
4821	}
4822	/* add authentication parameters */
4823	if (stcb->asoc.auth_supported) {
4824		/* attach RANDOM parameter, if available */
4825		if (stcb->asoc.authinfo.random != NULL) {
4826			struct sctp_auth_random *randp;
4827
4828			if (padding_len > 0) {
4829				memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4830				chunk_len += padding_len;
4831				padding_len = 0;
4832			}
4833			randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
4834			parameter_len = (uint16_t)sizeof(struct sctp_auth_random) + stcb->asoc.authinfo.random_len;
4835			/* random key already contains the header */
4836			memcpy(randp, stcb->asoc.authinfo.random->key, parameter_len);
4837			padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4838			chunk_len += parameter_len;
4839		}
4840		/* add HMAC_ALGO parameter */
4841		if (stcb->asoc.local_hmacs != NULL) {
4842			struct sctp_auth_hmac_algo *hmacs;
4843
4844			if (padding_len > 0) {
4845				memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4846				chunk_len += padding_len;
4847				padding_len = 0;
4848			}
4849			hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
4850			parameter_len = (uint16_t)(sizeof(struct sctp_auth_hmac_algo) +
4851			    stcb->asoc.local_hmacs->num_algo * sizeof(uint16_t));
4852			hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
4853			hmacs->ph.param_length = htons(parameter_len);
4854			sctp_serialize_hmaclist(stcb->asoc.local_hmacs, (uint8_t *)hmacs->hmac_ids);
4855			padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4856			chunk_len += parameter_len;
4857		}
4858		/* add CHUNKS parameter */
4859		if (stcb->asoc.local_auth_chunks != NULL) {
4860			struct sctp_auth_chunk_list *chunks;
4861
4862			if (padding_len > 0) {
4863				memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4864				chunk_len += padding_len;
4865				padding_len = 0;
4866			}
4867			chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
4868			parameter_len = (uint16_t)(sizeof(struct sctp_auth_chunk_list) +
4869			    sctp_auth_get_chklist_size(stcb->asoc.local_auth_chunks));
4870			chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
4871			chunks->ph.param_length = htons(parameter_len);
4872			sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks, chunks->chunk_types);
4873			padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4874			chunk_len += parameter_len;
4875		}
4876	}
4877
4878	/* now any cookie time extensions */
4879	if (stcb->asoc.cookie_preserve_req) {
4880		struct sctp_cookie_perserve_param *cookie_preserve;
4881
4882		if (padding_len > 0) {
4883			memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4884			chunk_len += padding_len;
4885			padding_len = 0;
4886		}
4887		parameter_len = (uint16_t)sizeof(struct sctp_cookie_perserve_param);
4888		cookie_preserve = (struct sctp_cookie_perserve_param *)(mtod(m, caddr_t)+chunk_len);
4889		cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
4890		cookie_preserve->ph.param_length = htons(parameter_len);
4891		cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
4892		stcb->asoc.cookie_preserve_req = 0;
4893		chunk_len += parameter_len;
4894	}
4895
4896	if (stcb->asoc.scope.ipv4_addr_legal || stcb->asoc.scope.ipv6_addr_legal) {
4897		uint8_t i;
4898
4899		if (padding_len > 0) {
4900			memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4901			chunk_len += padding_len;
4902			padding_len = 0;
4903		}
4904		parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4905		if (stcb->asoc.scope.ipv4_addr_legal) {
4906			parameter_len += (uint16_t)sizeof(uint16_t);
4907		}
4908		if (stcb->asoc.scope.ipv6_addr_legal) {
4909			parameter_len += (uint16_t)sizeof(uint16_t);
4910		}
4911		sup_addr = (struct sctp_supported_addr_param *)(mtod(m, caddr_t)+chunk_len);
4912		sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
4913		sup_addr->ph.param_length = htons(parameter_len);
4914		i = 0;
4915		if (stcb->asoc.scope.ipv4_addr_legal) {
4916			sup_addr->addr_type[i++] = htons(SCTP_IPV4_ADDRESS);
4917		}
4918		if (stcb->asoc.scope.ipv6_addr_legal) {
4919			sup_addr->addr_type[i++] = htons(SCTP_IPV6_ADDRESS);
4920		}
4921		padding_len = 4 - 2 * i;
4922		chunk_len += parameter_len;
4923	}
4924
4925	SCTP_BUF_LEN(m) = chunk_len;
4926	/* now the addresses */
4927	/*
4928	 * To optimize this we could put the scoping stuff into a structure
4929	 * and remove the individual uint8's from the assoc structure. Then
4930	 * we could just sifa in the address within the stcb. But for now
4931	 * this is a quick hack to get the address stuff teased apart.
4932	 */
4933	m_last = sctp_add_addresses_to_i_ia(inp, stcb, &stcb->asoc.scope,
4934	    m, cnt_inits_to,
4935	    &padding_len, &chunk_len);
4936
4937	init->ch.chunk_length = htons(chunk_len);
4938	if (padding_len > 0) {
4939		if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
4940			sctp_m_freem(m);
4941			return;
4942		}
4943	}
4944	SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - calls lowlevel_output\n");
4945	if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
4946	    (struct sockaddr *)&net->ro._l_addr,
4947	    m, 0, NULL, 0, 0, 0, 0,
4948	    inp->sctp_lport, stcb->rport, htonl(0),
4949	    net->port, NULL,
4950	    0, 0,
4951	    so_locked))) {
4952		SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak send error %d\n", error);
4953		if (error == ENOBUFS) {
4954			stcb->asoc.ifp_had_enobuf = 1;
4955			SCTP_STAT_INCR(sctps_lowlevelerr);
4956		}
4957	} else {
4958		stcb->asoc.ifp_had_enobuf = 0;
4959	}
4960	SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
4961	(void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
4962}
4963
4964struct mbuf *
4965sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
4966    int param_offset, int *abort_processing,
4967    struct sctp_chunkhdr *cp,
4968    int *nat_friendly,
4969    int *cookie_found)
4970{
4971	/*
4972	 * Given a mbuf containing an INIT or INIT-ACK with the param_offset
4973	 * being equal to the beginning of the params i.e. (iphlen +
4974	 * sizeof(struct sctp_init_msg) parse through the parameters to the
4975	 * end of the mbuf verifying that all parameters are known.
4976	 *
4977	 * For unknown parameters build and return a mbuf with
4978	 * UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
4979	 * processing this chunk stop, and set *abort_processing to 1.
4980	 *
4981	 * By having param_offset be pre-set to where parameters begin it is
4982	 * hoped that this routine may be reused in the future by new
4983	 * features.
4984	 */
4985	struct sctp_paramhdr *phdr, params;
4986
4987	struct mbuf *mat, *m_tmp, *op_err, *op_err_last;
4988	int at, limit, pad_needed;
4989	uint16_t ptype, plen, padded_size;
4990
4991	*abort_processing = 0;
4992	if (cookie_found != NULL) {
4993		*cookie_found = 0;
4994	}
4995	mat = in_initpkt;
4996	limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
4997	at = param_offset;
4998	op_err = NULL;
4999	op_err_last = NULL;
5000	pad_needed = 0;
5001	SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
5002	phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
5003	while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
5004		ptype = ntohs(phdr->param_type);
5005		plen = ntohs(phdr->param_length);
5006		if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
5007			/* wacked parameter */
5008			SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
5009			goto invalid_size;
5010		}
5011		limit -= SCTP_SIZE32(plen);
5012		/*-
5013		 * All parameters for all chunks that we know/understand are
5014		 * listed here. We process them other places and make
5015		 * appropriate stop actions per the upper bits. However this
5016		 * is the generic routine processor's can call to get back
5017		 * an operr.. to either incorporate (init-ack) or send.
5018		 */
5019		padded_size = SCTP_SIZE32(plen);
5020		switch (ptype) {
5021			/* Param's with variable size */
5022		case SCTP_HEARTBEAT_INFO:
5023		case SCTP_UNRECOG_PARAM:
5024		case SCTP_ERROR_CAUSE_IND:
5025			/* ok skip fwd */
5026			at += padded_size;
5027			break;
5028		case SCTP_STATE_COOKIE:
5029			if (cookie_found != NULL) {
5030				*cookie_found = 1;
5031			}
5032			at += padded_size;
5033			break;
5034			/* Param's with variable size within a range */
5035		case SCTP_CHUNK_LIST:
5036		case SCTP_SUPPORTED_CHUNK_EXT:
5037			if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
5038				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
5039				goto invalid_size;
5040			}
5041			at += padded_size;
5042			break;
5043		case SCTP_SUPPORTED_ADDRTYPE:
5044			if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
5045				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
5046				goto invalid_size;
5047			}
5048			at += padded_size;
5049			break;
5050		case SCTP_RANDOM:
5051			if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
5052				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
5053				goto invalid_size;
5054			}
5055			at += padded_size;
5056			break;
5057		case SCTP_SET_PRIM_ADDR:
5058		case SCTP_DEL_IP_ADDRESS:
5059		case SCTP_ADD_IP_ADDRESS:
5060			if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
5061			    (padded_size != sizeof(struct sctp_asconf_addr_param))) {
5062				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
5063				goto invalid_size;
5064			}
5065			at += padded_size;
5066			break;
5067			/* Param's with a fixed size */
5068		case SCTP_IPV4_ADDRESS:
5069			if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
5070				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
5071				goto invalid_size;
5072			}
5073			at += padded_size;
5074			break;
5075		case SCTP_IPV6_ADDRESS:
5076			if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
5077				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
5078				goto invalid_size;
5079			}
5080			at += padded_size;
5081			break;
5082		case SCTP_COOKIE_PRESERVE:
5083			if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
5084				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
5085				goto invalid_size;
5086			}
5087			at += padded_size;
5088			break;
5089		case SCTP_HAS_NAT_SUPPORT:
5090			*nat_friendly = 1;
5091			/* fall through */
5092		case SCTP_PRSCTP_SUPPORTED:
5093			if (padded_size != sizeof(struct sctp_paramhdr)) {
5094				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error prsctp/nat support %d\n", plen);
5095				goto invalid_size;
5096			}
5097			at += padded_size;
5098			break;
5099		case SCTP_ECN_CAPABLE:
5100			if (padded_size != sizeof(struct sctp_paramhdr)) {
5101				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
5102				goto invalid_size;
5103			}
5104			at += padded_size;
5105			break;
5106		case SCTP_ULP_ADAPTATION:
5107			if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
5108				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
5109				goto invalid_size;
5110			}
5111			at += padded_size;
5112			break;
5113		case SCTP_SUCCESS_REPORT:
5114			if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
5115				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
5116				goto invalid_size;
5117			}
5118			at += padded_size;
5119			break;
5120		case SCTP_HOSTNAME_ADDRESS:
5121			{
5122				/* Hostname parameters are deprecated. */
5123				struct sctp_gen_error_cause *cause;
5124				int l_len;
5125
5126				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
5127				*abort_processing = 1;
5128				sctp_m_freem(op_err);
5129				op_err = NULL;
5130				op_err_last = NULL;
5131#ifdef INET6
5132				l_len = SCTP_MIN_OVERHEAD;
5133#else
5134				l_len = SCTP_MIN_V4_OVERHEAD;
5135#endif
5136				l_len += sizeof(struct sctp_chunkhdr);
5137				l_len += sizeof(struct sctp_gen_error_cause);
5138				op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5139				if (op_err != NULL) {
5140					/*
5141					 * Pre-reserve space for IP, SCTP,
5142					 * and chunk header.
5143					 */
5144#ifdef INET6
5145					SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5146#else
5147					SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5148#endif
5149					SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5150					SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5151					SCTP_BUF_LEN(op_err) = sizeof(struct sctp_gen_error_cause);
5152					cause = mtod(op_err, struct sctp_gen_error_cause *);
5153					cause->code = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
5154					cause->length = htons((uint16_t)(sizeof(struct sctp_gen_error_cause) + plen));
5155					SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(mat, at, plen, M_NOWAIT);
5156					if (SCTP_BUF_NEXT(op_err) == NULL) {
5157						sctp_m_freem(op_err);
5158						op_err = NULL;
5159						op_err_last = NULL;
5160					}
5161				}
5162				return (op_err);
5163				break;
5164			}
5165		default:
5166			/*
5167			 * we do not recognize the parameter figure out what
5168			 * we do.
5169			 */
5170			SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
5171			if ((ptype & 0x4000) == 0x4000) {
5172				/* Report bit is set?? */
5173				SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
5174				if (op_err == NULL) {
5175					int l_len;
5176
5177					/* Ok need to try to get an mbuf */
5178#ifdef INET6
5179					l_len = SCTP_MIN_OVERHEAD;
5180#else
5181					l_len = SCTP_MIN_V4_OVERHEAD;
5182#endif
5183					l_len += sizeof(struct sctp_chunkhdr);
5184					l_len += sizeof(struct sctp_paramhdr);
5185					op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5186					if (op_err) {
5187						SCTP_BUF_LEN(op_err) = 0;
5188#ifdef INET6
5189						SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5190#else
5191						SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5192#endif
5193						SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5194						SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5195						op_err_last = op_err;
5196					}
5197				}
5198				if (op_err != NULL) {
5199					/* If we have space */
5200					struct sctp_paramhdr *param;
5201
5202					if (pad_needed > 0) {
5203						op_err_last = sctp_add_pad_tombuf(op_err_last, pad_needed);
5204					}
5205					if (op_err_last == NULL) {
5206						sctp_m_freem(op_err);
5207						op_err = NULL;
5208						op_err_last = NULL;
5209						goto more_processing;
5210					}
5211					if (M_TRAILINGSPACE(op_err_last) < (int)sizeof(struct sctp_paramhdr)) {
5212						m_tmp = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_NOWAIT, 1, MT_DATA);
5213						if (m_tmp == NULL) {
5214							sctp_m_freem(op_err);
5215							op_err = NULL;
5216							op_err_last = NULL;
5217							goto more_processing;
5218						}
5219						SCTP_BUF_LEN(m_tmp) = 0;
5220						SCTP_BUF_NEXT(m_tmp) = NULL;
5221						SCTP_BUF_NEXT(op_err_last) = m_tmp;
5222						op_err_last = m_tmp;
5223					}
5224					param = (struct sctp_paramhdr *)(mtod(op_err_last, caddr_t)+SCTP_BUF_LEN(op_err_last));
5225					param->param_type = htons(SCTP_UNRECOG_PARAM);
5226					param->param_length = htons((uint16_t)sizeof(struct sctp_paramhdr) + plen);
5227					SCTP_BUF_LEN(op_err_last) += sizeof(struct sctp_paramhdr);
5228					SCTP_BUF_NEXT(op_err_last) = SCTP_M_COPYM(mat, at, plen, M_NOWAIT);
5229					if (SCTP_BUF_NEXT(op_err_last) == NULL) {
5230						sctp_m_freem(op_err);
5231						op_err = NULL;
5232						op_err_last = NULL;
5233						goto more_processing;
5234					} else {
5235						while (SCTP_BUF_NEXT(op_err_last) != NULL) {
5236							op_err_last = SCTP_BUF_NEXT(op_err_last);
5237						}
5238					}
5239					if (plen % 4 != 0) {
5240						pad_needed = 4 - (plen % 4);
5241					} else {
5242						pad_needed = 0;
5243					}
5244				}
5245			}
5246	more_processing:
5247			if ((ptype & 0x8000) == 0x0000) {
5248				SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
5249				return (op_err);
5250			} else {
5251				/* skip this chunk and continue processing */
5252				SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
5253				at += SCTP_SIZE32(plen);
5254			}
5255			break;
5256
5257		}
5258		phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
5259	}
5260	return (op_err);
5261invalid_size:
5262	SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
5263	*abort_processing = 1;
5264	sctp_m_freem(op_err);
5265	op_err = NULL;
5266	op_err_last = NULL;
5267	if (phdr != NULL) {
5268		struct sctp_paramhdr *param;
5269		int l_len;
5270#ifdef INET6
5271		l_len = SCTP_MIN_OVERHEAD;
5272#else
5273		l_len = SCTP_MIN_V4_OVERHEAD;
5274#endif
5275		l_len += sizeof(struct sctp_chunkhdr);
5276		l_len += (2 * sizeof(struct sctp_paramhdr));
5277		op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5278		if (op_err) {
5279			SCTP_BUF_LEN(op_err) = 0;
5280#ifdef INET6
5281			SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5282#else
5283			SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5284#endif
5285			SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5286			SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5287			SCTP_BUF_LEN(op_err) = 2 * sizeof(struct sctp_paramhdr);
5288			param = mtod(op_err, struct sctp_paramhdr *);
5289			param->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
5290			param->param_length = htons(2 * sizeof(struct sctp_paramhdr));
5291			param++;
5292			param->param_type = htons(ptype);
5293			param->param_length = htons(plen);
5294		}
5295	}
5296	return (op_err);
5297}
5298
5299static int
5300sctp_are_there_new_addresses(struct sctp_association *asoc,
5301    struct mbuf *in_initpkt, int offset, struct sockaddr *src)
5302{
5303	/*
5304	 * Given a INIT packet, look through the packet to verify that there
5305	 * are NO new addresses. As we go through the parameters add reports
5306	 * of any un-understood parameters that require an error.  Also we
5307	 * must return (1) to drop the packet if we see a un-understood
5308	 * parameter that tells us to drop the chunk.
5309	 */
5310	struct sockaddr *sa_touse;
5311	struct sockaddr *sa;
5312	struct sctp_paramhdr *phdr, params;
5313	uint16_t ptype, plen;
5314	uint8_t fnd;
5315	struct sctp_nets *net;
5316	int check_src;
5317#ifdef INET
5318	struct sockaddr_in sin4, *sa4;
5319#endif
5320#ifdef INET6
5321	struct sockaddr_in6 sin6, *sa6;
5322#endif
5323
5324#ifdef INET
5325	memset(&sin4, 0, sizeof(sin4));
5326	sin4.sin_family = AF_INET;
5327	sin4.sin_len = sizeof(sin4);
5328#endif
5329#ifdef INET6
5330	memset(&sin6, 0, sizeof(sin6));
5331	sin6.sin6_family = AF_INET6;
5332	sin6.sin6_len = sizeof(sin6);
5333#endif
5334	/* First what about the src address of the pkt ? */
5335	check_src = 0;
5336	switch (src->sa_family) {
5337#ifdef INET
5338	case AF_INET:
5339		if (asoc->scope.ipv4_addr_legal) {
5340			check_src = 1;
5341		}
5342		break;
5343#endif
5344#ifdef INET6
5345	case AF_INET6:
5346		if (asoc->scope.ipv6_addr_legal) {
5347			check_src = 1;
5348		}
5349		break;
5350#endif
5351	default:
5352		/* TSNH */
5353		break;
5354	}
5355	if (check_src) {
5356		fnd = 0;
5357		TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5358			sa = (struct sockaddr *)&net->ro._l_addr;
5359			if (sa->sa_family == src->sa_family) {
5360#ifdef INET
5361				if (sa->sa_family == AF_INET) {
5362					struct sockaddr_in *src4;
5363
5364					sa4 = (struct sockaddr_in *)sa;
5365					src4 = (struct sockaddr_in *)src;
5366					if (sa4->sin_addr.s_addr == src4->sin_addr.s_addr) {
5367						fnd = 1;
5368						break;
5369					}
5370				}
5371#endif
5372#ifdef INET6
5373				if (sa->sa_family == AF_INET6) {
5374					struct sockaddr_in6 *src6;
5375
5376					sa6 = (struct sockaddr_in6 *)sa;
5377					src6 = (struct sockaddr_in6 *)src;
5378					if (SCTP6_ARE_ADDR_EQUAL(sa6, src6)) {
5379						fnd = 1;
5380						break;
5381					}
5382				}
5383#endif
5384			}
5385		}
5386		if (fnd == 0) {
5387			/* New address added! no need to look further. */
5388			return (1);
5389		}
5390	}
5391	/* Ok so far lets munge through the rest of the packet */
5392	offset += sizeof(struct sctp_init_chunk);
5393	phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5394	while (phdr) {
5395		sa_touse = NULL;
5396		ptype = ntohs(phdr->param_type);
5397		plen = ntohs(phdr->param_length);
5398		switch (ptype) {
5399#ifdef INET
5400		case SCTP_IPV4_ADDRESS:
5401			{
5402				struct sctp_ipv4addr_param *p4, p4_buf;
5403
5404				if (plen != sizeof(struct sctp_ipv4addr_param)) {
5405					return (1);
5406				}
5407				phdr = sctp_get_next_param(in_initpkt, offset,
5408				    (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
5409				if (phdr == NULL) {
5410					return (1);
5411				}
5412				if (asoc->scope.ipv4_addr_legal) {
5413					p4 = (struct sctp_ipv4addr_param *)phdr;
5414					sin4.sin_addr.s_addr = p4->addr;
5415					sa_touse = (struct sockaddr *)&sin4;
5416				}
5417				break;
5418			}
5419#endif
5420#ifdef INET6
5421		case SCTP_IPV6_ADDRESS:
5422			{
5423				struct sctp_ipv6addr_param *p6, p6_buf;
5424
5425				if (plen != sizeof(struct sctp_ipv6addr_param)) {
5426					return (1);
5427				}
5428				phdr = sctp_get_next_param(in_initpkt, offset,
5429				    (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
5430				if (phdr == NULL) {
5431					return (1);
5432				}
5433				if (asoc->scope.ipv6_addr_legal) {
5434					p6 = (struct sctp_ipv6addr_param *)phdr;
5435					memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
5436					    sizeof(p6->addr));
5437					sa_touse = (struct sockaddr *)&sin6;
5438				}
5439				break;
5440			}
5441#endif
5442		default:
5443			sa_touse = NULL;
5444			break;
5445		}
5446		if (sa_touse) {
5447			/* ok, sa_touse points to one to check */
5448			fnd = 0;
5449			TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5450				sa = (struct sockaddr *)&net->ro._l_addr;
5451				if (sa->sa_family != sa_touse->sa_family) {
5452					continue;
5453				}
5454#ifdef INET
5455				if (sa->sa_family == AF_INET) {
5456					sa4 = (struct sockaddr_in *)sa;
5457					if (sa4->sin_addr.s_addr ==
5458					    sin4.sin_addr.s_addr) {
5459						fnd = 1;
5460						break;
5461					}
5462				}
5463#endif
5464#ifdef INET6
5465				if (sa->sa_family == AF_INET6) {
5466					sa6 = (struct sockaddr_in6 *)sa;
5467					if (SCTP6_ARE_ADDR_EQUAL(
5468					    sa6, &sin6)) {
5469						fnd = 1;
5470						break;
5471					}
5472				}
5473#endif
5474			}
5475			if (!fnd) {
5476				/* New addr added! no need to look further */
5477				return (1);
5478			}
5479		}
5480		offset += SCTP_SIZE32(plen);
5481		phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5482	}
5483	return (0);
5484}
5485
5486/*
5487 * Given a MBUF chain that was sent into us containing an INIT. Build a
5488 * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
5489 * a pullup to include IPv6/4header, SCTP header and initial part of INIT
5490 * message (i.e. the struct sctp_init_msg).
5491 */
5492void
5493sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
5494    struct sctp_nets *src_net, struct mbuf *init_pkt,
5495    int iphlen, int offset,
5496    struct sockaddr *src, struct sockaddr *dst,
5497    struct sctphdr *sh, struct sctp_init_chunk *init_chk,
5498    uint8_t mflowtype, uint32_t mflowid,
5499    uint32_t vrf_id, uint16_t port)
5500{
5501	struct sctp_association *asoc;
5502	struct mbuf *m, *m_tmp, *m_last, *m_cookie, *op_err;
5503	struct sctp_init_ack_chunk *initack;
5504	struct sctp_adaptation_layer_indication *ali;
5505	struct sctp_supported_chunk_types_param *pr_supported;
5506	struct sctp_paramhdr *ph;
5507	union sctp_sockstore *over_addr;
5508	struct sctp_scoping scp;
5509	struct timeval now;
5510#ifdef INET
5511	struct sockaddr_in *dst4 = (struct sockaddr_in *)dst;
5512	struct sockaddr_in *src4 = (struct sockaddr_in *)src;
5513	struct sockaddr_in *sin;
5514#endif
5515#ifdef INET6
5516	struct sockaddr_in6 *dst6 = (struct sockaddr_in6 *)dst;
5517	struct sockaddr_in6 *src6 = (struct sockaddr_in6 *)src;
5518	struct sockaddr_in6 *sin6;
5519#endif
5520	struct sockaddr *to;
5521	struct sctp_state_cookie stc;
5522	struct sctp_nets *net = NULL;
5523	uint8_t *signature = NULL;
5524	int cnt_inits_to = 0;
5525	uint16_t his_limit, i_want;
5526	int abort_flag;
5527	int nat_friendly = 0;
5528	int error;
5529	struct socket *so;
5530	uint16_t num_ext, chunk_len, padding_len, parameter_len;
5531
5532	if (stcb) {
5533		asoc = &stcb->asoc;
5534	} else {
5535		asoc = NULL;
5536	}
5537	if ((asoc != NULL) &&
5538	    (SCTP_GET_STATE(stcb) != SCTP_STATE_COOKIE_WAIT)) {
5539		if (sctp_are_there_new_addresses(asoc, init_pkt, offset, src)) {
5540			/*
5541			 * new addresses, out of here in non-cookie-wait
5542			 * states
5543			 *
5544			 * Send an ABORT, without the new address error
5545			 * cause. This looks no different than if no
5546			 * listener was present.
5547			 */
5548			op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5549			    "Address added");
5550			sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5551			    mflowtype, mflowid, inp->fibnum,
5552			    vrf_id, port);
5553			return;
5554		}
5555		if (src_net != NULL && (src_net->port != port)) {
5556			/*
5557			 * change of remote encapsulation port, out of here
5558			 * in non-cookie-wait states
5559			 *
5560			 * Send an ABORT, without an specific error cause.
5561			 * This looks no different than if no listener was
5562			 * present.
5563			 */
5564			op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5565			    "Remote encapsulation port changed");
5566			sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5567			    mflowtype, mflowid, inp->fibnum,
5568			    vrf_id, port);
5569			return;
5570		}
5571	}
5572	abort_flag = 0;
5573	op_err = sctp_arethere_unrecognized_parameters(init_pkt,
5574	    (offset + sizeof(struct sctp_init_chunk)),
5575	    &abort_flag,
5576	    (struct sctp_chunkhdr *)init_chk,
5577	    &nat_friendly, NULL);
5578	if (abort_flag) {
5579do_a_abort:
5580		if (op_err == NULL) {
5581			char msg[SCTP_DIAG_INFO_LEN];
5582
5583			snprintf(msg, sizeof(msg), "%s:%d at %s", __FILE__, __LINE__, __func__);
5584			op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5585			    msg);
5586		}
5587		sctp_send_abort(init_pkt, iphlen, src, dst, sh,
5588		    init_chk->init.initiate_tag, op_err,
5589		    mflowtype, mflowid, inp->fibnum,
5590		    vrf_id, port);
5591		return;
5592	}
5593	m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
5594	if (m == NULL) {
5595		/* No memory, INIT timer will re-attempt. */
5596		sctp_m_freem(op_err);
5597		return;
5598	}
5599	chunk_len = (uint16_t)sizeof(struct sctp_init_ack_chunk);
5600	padding_len = 0;
5601
5602	/*
5603	 * We might not overwrite the identification[] completely and on
5604	 * some platforms time_entered will contain some padding. Therefore
5605	 * zero out the cookie to avoid putting uninitialized memory on the
5606	 * wire.
5607	 */
5608	memset(&stc, 0, sizeof(struct sctp_state_cookie));
5609
5610	/* the time I built cookie */
5611	(void)SCTP_GETTIME_TIMEVAL(&now);
5612	stc.time_entered.tv_sec = now.tv_sec;
5613	stc.time_entered.tv_usec = now.tv_usec;
5614
5615	/* populate any tie tags */
5616	if (asoc != NULL) {
5617		/* unlock before tag selections */
5618		stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
5619		stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
5620		stc.cookie_life = asoc->cookie_life;
5621		net = asoc->primary_destination;
5622	} else {
5623		stc.tie_tag_my_vtag = 0;
5624		stc.tie_tag_peer_vtag = 0;
5625		/* life I will award this cookie */
5626		stc.cookie_life = inp->sctp_ep.def_cookie_life;
5627	}
5628
5629	/* copy in the ports for later check */
5630	stc.myport = sh->dest_port;
5631	stc.peerport = sh->src_port;
5632
5633	/*
5634	 * If we wanted to honor cookie life extensions, we would add to
5635	 * stc.cookie_life. For now we should NOT honor any extension
5636	 */
5637	stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
5638	if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5639		stc.ipv6_addr_legal = 1;
5640		if (SCTP_IPV6_V6ONLY(inp)) {
5641			stc.ipv4_addr_legal = 0;
5642		} else {
5643			stc.ipv4_addr_legal = 1;
5644		}
5645	} else {
5646		stc.ipv6_addr_legal = 0;
5647		stc.ipv4_addr_legal = 1;
5648	}
5649	stc.ipv4_scope = 0;
5650	if (net == NULL) {
5651		to = src;
5652		switch (dst->sa_family) {
5653#ifdef INET
5654		case AF_INET:
5655			{
5656				/* lookup address */
5657				stc.address[0] = src4->sin_addr.s_addr;
5658				stc.address[1] = 0;
5659				stc.address[2] = 0;
5660				stc.address[3] = 0;
5661				stc.addr_type = SCTP_IPV4_ADDRESS;
5662				/* local from address */
5663				stc.laddress[0] = dst4->sin_addr.s_addr;
5664				stc.laddress[1] = 0;
5665				stc.laddress[2] = 0;
5666				stc.laddress[3] = 0;
5667				stc.laddr_type = SCTP_IPV4_ADDRESS;
5668				/* scope_id is only for v6 */
5669				stc.scope_id = 0;
5670				if ((IN4_ISPRIVATE_ADDRESS(&src4->sin_addr)) ||
5671				    (IN4_ISPRIVATE_ADDRESS(&dst4->sin_addr))) {
5672					stc.ipv4_scope = 1;
5673				}
5674				/* Must use the address in this case */
5675				if (sctp_is_address_on_local_host(src, vrf_id)) {
5676					stc.loopback_scope = 1;
5677					stc.ipv4_scope = 1;
5678					stc.site_scope = 1;
5679					stc.local_scope = 0;
5680				}
5681				break;
5682			}
5683#endif
5684#ifdef INET6
5685		case AF_INET6:
5686			{
5687				stc.addr_type = SCTP_IPV6_ADDRESS;
5688				memcpy(&stc.address, &src6->sin6_addr, sizeof(struct in6_addr));
5689				stc.scope_id = ntohs(in6_getscope(&src6->sin6_addr));
5690				if (sctp_is_address_on_local_host(src, vrf_id)) {
5691					stc.loopback_scope = 1;
5692					stc.local_scope = 0;
5693					stc.site_scope = 1;
5694					stc.ipv4_scope = 1;
5695				} else if (IN6_IS_ADDR_LINKLOCAL(&src6->sin6_addr) ||
5696				    IN6_IS_ADDR_LINKLOCAL(&dst6->sin6_addr)) {
5697					/*
5698					 * If the new destination or source
5699					 * is a LINK_LOCAL we must have
5700					 * common both site and local scope.
5701					 * Don't set local scope though
5702					 * since we must depend on the
5703					 * source to be added implicitly. We
5704					 * cannot assure just because we
5705					 * share one link that all links are
5706					 * common.
5707					 */
5708					stc.local_scope = 0;
5709					stc.site_scope = 1;
5710					stc.ipv4_scope = 1;
5711					/*
5712					 * we start counting for the private
5713					 * address stuff at 1. since the
5714					 * link local we source from won't
5715					 * show up in our scoped count.
5716					 */
5717					cnt_inits_to = 1;
5718					/*
5719					 * pull out the scope_id from
5720					 * incoming pkt
5721					 */
5722				} else if (IN6_IS_ADDR_SITELOCAL(&src6->sin6_addr) ||
5723				    IN6_IS_ADDR_SITELOCAL(&dst6->sin6_addr)) {
5724					/*
5725					 * If the new destination or source
5726					 * is SITE_LOCAL then we must have
5727					 * site scope in common.
5728					 */
5729					stc.site_scope = 1;
5730				}
5731				memcpy(&stc.laddress, &dst6->sin6_addr, sizeof(struct in6_addr));
5732				stc.laddr_type = SCTP_IPV6_ADDRESS;
5733				break;
5734			}
5735#endif
5736		default:
5737			/* TSNH */
5738			goto do_a_abort;
5739			break;
5740		}
5741	} else {
5742		/* set the scope per the existing tcb */
5743
5744#ifdef INET6
5745		struct sctp_nets *lnet;
5746#endif
5747
5748		stc.loopback_scope = asoc->scope.loopback_scope;
5749		stc.ipv4_scope = asoc->scope.ipv4_local_scope;
5750		stc.site_scope = asoc->scope.site_scope;
5751		stc.local_scope = asoc->scope.local_scope;
5752#ifdef INET6
5753		/* Why do we not consider IPv4 LL addresses? */
5754		TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
5755			if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
5756				if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
5757					/*
5758					 * if we have a LL address, start
5759					 * counting at 1.
5760					 */
5761					cnt_inits_to = 1;
5762				}
5763			}
5764		}
5765#endif
5766		/* use the net pointer */
5767		to = (struct sockaddr *)&net->ro._l_addr;
5768		switch (to->sa_family) {
5769#ifdef INET
5770		case AF_INET:
5771			sin = (struct sockaddr_in *)to;
5772			stc.address[0] = sin->sin_addr.s_addr;
5773			stc.address[1] = 0;
5774			stc.address[2] = 0;
5775			stc.address[3] = 0;
5776			stc.addr_type = SCTP_IPV4_ADDRESS;
5777			if (net->src_addr_selected == 0) {
5778				/*
5779				 * strange case here, the INIT should have
5780				 * did the selection.
5781				 */
5782				net->ro._s_addr = sctp_source_address_selection(inp,
5783				    stcb, (sctp_route_t *)&net->ro,
5784				    net, 0, vrf_id);
5785				if (net->ro._s_addr == NULL) {
5786					sctp_m_freem(op_err);
5787					sctp_m_freem(m);
5788					return;
5789				}
5790
5791				net->src_addr_selected = 1;
5792
5793			}
5794			stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
5795			stc.laddress[1] = 0;
5796			stc.laddress[2] = 0;
5797			stc.laddress[3] = 0;
5798			stc.laddr_type = SCTP_IPV4_ADDRESS;
5799			/* scope_id is only for v6 */
5800			stc.scope_id = 0;
5801			break;
5802#endif
5803#ifdef INET6
5804		case AF_INET6:
5805			sin6 = (struct sockaddr_in6 *)to;
5806			memcpy(&stc.address, &sin6->sin6_addr,
5807			    sizeof(struct in6_addr));
5808			stc.addr_type = SCTP_IPV6_ADDRESS;
5809			stc.scope_id = sin6->sin6_scope_id;
5810			if (net->src_addr_selected == 0) {
5811				/*
5812				 * strange case here, the INIT should have
5813				 * done the selection.
5814				 */
5815				net->ro._s_addr = sctp_source_address_selection(inp,
5816				    stcb, (sctp_route_t *)&net->ro,
5817				    net, 0, vrf_id);
5818				if (net->ro._s_addr == NULL) {
5819					sctp_m_freem(op_err);
5820					sctp_m_freem(m);
5821					return;
5822				}
5823
5824				net->src_addr_selected = 1;
5825			}
5826			memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
5827			    sizeof(struct in6_addr));
5828			stc.laddr_type = SCTP_IPV6_ADDRESS;
5829			break;
5830#endif
5831		}
5832	}
5833	/* Now lets put the SCTP header in place */
5834	initack = mtod(m, struct sctp_init_ack_chunk *);
5835	/* Save it off for quick ref */
5836	stc.peers_vtag = ntohl(init_chk->init.initiate_tag);
5837	/* who are we */
5838	memcpy(stc.identification, SCTP_VERSION_STRING,
5839	    min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
5840	memset(stc.reserved, 0, SCTP_RESERVE_SPACE);
5841	/* now the chunk header */
5842	initack->ch.chunk_type = SCTP_INITIATION_ACK;
5843	initack->ch.chunk_flags = 0;
5844	/* fill in later from mbuf we build */
5845	initack->ch.chunk_length = 0;
5846	/* place in my tag */
5847	if ((asoc != NULL) &&
5848	    ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
5849	    (SCTP_GET_STATE(stcb) == SCTP_STATE_INUSE) ||
5850	    (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED))) {
5851		/* re-use the v-tags and init-seq here */
5852		initack->init.initiate_tag = htonl(asoc->my_vtag);
5853		initack->init.initial_tsn = htonl(asoc->init_seq_number);
5854	} else {
5855		uint32_t vtag, itsn;
5856
5857		if (asoc) {
5858			atomic_add_int(&asoc->refcnt, 1);
5859			SCTP_TCB_UNLOCK(stcb);
5860	new_tag:
5861			vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5862			if ((asoc->peer_supports_nat) && (vtag == asoc->my_vtag)) {
5863				/*
5864				 * Got a duplicate vtag on some guy behind a
5865				 * nat make sure we don't use it.
5866				 */
5867				goto new_tag;
5868			}
5869			initack->init.initiate_tag = htonl(vtag);
5870			/* get a TSN to use too */
5871			itsn = sctp_select_initial_TSN(&inp->sctp_ep);
5872			initack->init.initial_tsn = htonl(itsn);
5873			SCTP_TCB_LOCK(stcb);
5874			atomic_add_int(&asoc->refcnt, -1);
5875		} else {
5876			SCTP_INP_INCR_REF(inp);
5877			SCTP_INP_RUNLOCK(inp);
5878			vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5879			initack->init.initiate_tag = htonl(vtag);
5880			/* get a TSN to use too */
5881			initack->init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
5882			SCTP_INP_RLOCK(inp);
5883			SCTP_INP_DECR_REF(inp);
5884		}
5885	}
5886	/* save away my tag to */
5887	stc.my_vtag = initack->init.initiate_tag;
5888
5889	/* set up some of the credits. */
5890	so = inp->sctp_socket;
5891	if (so == NULL) {
5892		/* memory problem */
5893		sctp_m_freem(op_err);
5894		sctp_m_freem(m);
5895		return;
5896	} else {
5897		initack->init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
5898	}
5899	/* set what I want */
5900	his_limit = ntohs(init_chk->init.num_inbound_streams);
5901	/* choose what I want */
5902	if (asoc != NULL) {
5903		if (asoc->streamoutcnt > asoc->pre_open_streams) {
5904			i_want = asoc->streamoutcnt;
5905		} else {
5906			i_want = asoc->pre_open_streams;
5907		}
5908	} else {
5909		i_want = inp->sctp_ep.pre_open_stream_count;
5910	}
5911	if (his_limit < i_want) {
5912		/* I Want more :< */
5913		initack->init.num_outbound_streams = init_chk->init.num_inbound_streams;
5914	} else {
5915		/* I can have what I want :> */
5916		initack->init.num_outbound_streams = htons(i_want);
5917	}
5918	/* tell him his limit. */
5919	initack->init.num_inbound_streams =
5920	    htons(inp->sctp_ep.max_open_streams_intome);
5921
5922	/* adaptation layer indication parameter */
5923	if (inp->sctp_ep.adaptation_layer_indicator_provided) {
5924		parameter_len = (uint16_t)sizeof(struct sctp_adaptation_layer_indication);
5925		ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
5926		ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
5927		ali->ph.param_length = htons(parameter_len);
5928		ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
5929		chunk_len += parameter_len;
5930	}
5931
5932	/* ECN parameter */
5933	if (((asoc != NULL) && (asoc->ecn_supported == 1)) ||
5934	    ((asoc == NULL) && (inp->ecn_supported == 1))) {
5935		parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5936		ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5937		ph->param_type = htons(SCTP_ECN_CAPABLE);
5938		ph->param_length = htons(parameter_len);
5939		chunk_len += parameter_len;
5940	}
5941
5942	/* PR-SCTP supported parameter */
5943	if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5944	    ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5945		parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5946		ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5947		ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
5948		ph->param_length = htons(parameter_len);
5949		chunk_len += parameter_len;
5950	}
5951
5952	/* Add NAT friendly parameter */
5953	if (nat_friendly) {
5954		parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5955		ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5956		ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
5957		ph->param_length = htons(parameter_len);
5958		chunk_len += parameter_len;
5959	}
5960
5961	/* And now tell the peer which extensions we support */
5962	num_ext = 0;
5963	pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
5964	if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5965	    ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5966		pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
5967		if (((asoc != NULL) && (asoc->idata_supported == 1)) ||
5968		    ((asoc == NULL) && (inp->idata_supported == 1))) {
5969			pr_supported->chunk_types[num_ext++] = SCTP_IFORWARD_CUM_TSN;
5970		}
5971	}
5972	if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
5973	    ((asoc == NULL) && (inp->auth_supported == 1))) {
5974		pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
5975	}
5976	if (((asoc != NULL) && (asoc->asconf_supported == 1)) ||
5977	    ((asoc == NULL) && (inp->asconf_supported == 1))) {
5978		pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
5979		pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
5980	}
5981	if (((asoc != NULL) && (asoc->reconfig_supported == 1)) ||
5982	    ((asoc == NULL) && (inp->reconfig_supported == 1))) {
5983		pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
5984	}
5985	if (((asoc != NULL) && (asoc->idata_supported == 1)) ||
5986	    ((asoc == NULL) && (inp->idata_supported == 1))) {
5987		pr_supported->chunk_types[num_ext++] = SCTP_IDATA;
5988	}
5989	if (((asoc != NULL) && (asoc->nrsack_supported == 1)) ||
5990	    ((asoc == NULL) && (inp->nrsack_supported == 1))) {
5991		pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
5992	}
5993	if (((asoc != NULL) && (asoc->pktdrop_supported == 1)) ||
5994	    ((asoc == NULL) && (inp->pktdrop_supported == 1))) {
5995		pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
5996	}
5997	if (num_ext > 0) {
5998		parameter_len = (uint16_t)sizeof(struct sctp_supported_chunk_types_param) + num_ext;
5999		pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
6000		pr_supported->ph.param_length = htons(parameter_len);
6001		padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6002		chunk_len += parameter_len;
6003	}
6004
6005	/* add authentication parameters */
6006	if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
6007	    ((asoc == NULL) && (inp->auth_supported == 1))) {
6008		struct sctp_auth_random *randp;
6009		struct sctp_auth_hmac_algo *hmacs;
6010		struct sctp_auth_chunk_list *chunks;
6011
6012		if (padding_len > 0) {
6013			memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6014			chunk_len += padding_len;
6015			padding_len = 0;
6016		}
6017		/* generate and add RANDOM parameter */
6018		randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
6019		parameter_len = (uint16_t)sizeof(struct sctp_auth_random) +
6020		    SCTP_AUTH_RANDOM_SIZE_DEFAULT;
6021		randp->ph.param_type = htons(SCTP_RANDOM);
6022		randp->ph.param_length = htons(parameter_len);
6023		SCTP_READ_RANDOM(randp->random_data, SCTP_AUTH_RANDOM_SIZE_DEFAULT);
6024		padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6025		chunk_len += parameter_len;
6026
6027		if (padding_len > 0) {
6028			memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6029			chunk_len += padding_len;
6030			padding_len = 0;
6031		}
6032		/* add HMAC_ALGO parameter */
6033		hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
6034		parameter_len = (uint16_t)sizeof(struct sctp_auth_hmac_algo) +
6035		    sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
6036		    (uint8_t *)hmacs->hmac_ids);
6037		hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
6038		hmacs->ph.param_length = htons(parameter_len);
6039		padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6040		chunk_len += parameter_len;
6041
6042		if (padding_len > 0) {
6043			memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6044			chunk_len += padding_len;
6045			padding_len = 0;
6046		}
6047		/* add CHUNKS parameter */
6048		chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
6049		parameter_len = (uint16_t)sizeof(struct sctp_auth_chunk_list) +
6050		    sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
6051		    chunks->chunk_types);
6052		chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
6053		chunks->ph.param_length = htons(parameter_len);
6054		padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6055		chunk_len += parameter_len;
6056	}
6057	SCTP_BUF_LEN(m) = chunk_len;
6058	m_last = m;
6059	/* now the addresses */
6060	/*
6061	 * To optimize this we could put the scoping stuff into a structure
6062	 * and remove the individual uint8's from the stc structure. Then we
6063	 * could just sifa in the address within the stc.. but for now this
6064	 * is a quick hack to get the address stuff teased apart.
6065	 */
6066	scp.ipv4_addr_legal = stc.ipv4_addr_legal;
6067	scp.ipv6_addr_legal = stc.ipv6_addr_legal;
6068	scp.loopback_scope = stc.loopback_scope;
6069	scp.ipv4_local_scope = stc.ipv4_scope;
6070	scp.local_scope = stc.local_scope;
6071	scp.site_scope = stc.site_scope;
6072	m_last = sctp_add_addresses_to_i_ia(inp, stcb, &scp, m_last,
6073	    cnt_inits_to,
6074	    &padding_len, &chunk_len);
6075	/* padding_len can only be positive, if no addresses have been added */
6076	if (padding_len > 0) {
6077		memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6078		chunk_len += padding_len;
6079		SCTP_BUF_LEN(m) += padding_len;
6080		padding_len = 0;
6081	}
6082
6083	/* tack on the operational error if present */
6084	if (op_err) {
6085		parameter_len = 0;
6086		for (m_tmp = op_err; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6087			parameter_len += SCTP_BUF_LEN(m_tmp);
6088		}
6089		padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6090		SCTP_BUF_NEXT(m_last) = op_err;
6091		while (SCTP_BUF_NEXT(m_last) != NULL) {
6092			m_last = SCTP_BUF_NEXT(m_last);
6093		}
6094		chunk_len += parameter_len;
6095	}
6096	if (padding_len > 0) {
6097		m_last = sctp_add_pad_tombuf(m_last, padding_len);
6098		if (m_last == NULL) {
6099			/* Houston we have a problem, no space */
6100			sctp_m_freem(m);
6101			return;
6102		}
6103		chunk_len += padding_len;
6104		padding_len = 0;
6105	}
6106	/* Now we must build a cookie */
6107	m_cookie = sctp_add_cookie(init_pkt, offset, m, 0, &stc, &signature);
6108	if (m_cookie == NULL) {
6109		/* memory problem */
6110		sctp_m_freem(m);
6111		return;
6112	}
6113	/* Now append the cookie to the end and update the space/size */
6114	SCTP_BUF_NEXT(m_last) = m_cookie;
6115	parameter_len = 0;
6116	for (m_tmp = m_cookie; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6117		parameter_len += SCTP_BUF_LEN(m_tmp);
6118		if (SCTP_BUF_NEXT(m_tmp) == NULL) {
6119			m_last = m_tmp;
6120		}
6121	}
6122	padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6123	chunk_len += parameter_len;
6124
6125	/*
6126	 * Place in the size, but we don't include the last pad (if any) in
6127	 * the INIT-ACK.
6128	 */
6129	initack->ch.chunk_length = htons(chunk_len);
6130
6131	/*
6132	 * Time to sign the cookie, we don't sign over the cookie signature
6133	 * though thus we set trailer.
6134	 */
6135	(void)sctp_hmac_m(SCTP_HMAC,
6136	    (uint8_t *)inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
6137	    SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
6138	    (uint8_t *)signature, SCTP_SIGNATURE_SIZE);
6139	/*
6140	 * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
6141	 * here since the timer will drive a retranmission.
6142	 */
6143	if (padding_len > 0) {
6144		if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
6145			sctp_m_freem(m);
6146			return;
6147		}
6148	}
6149	if (stc.loopback_scope) {
6150		over_addr = (union sctp_sockstore *)dst;
6151	} else {
6152		over_addr = NULL;
6153	}
6154
6155	if ((error = sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
6156	    0, 0,
6157	    inp->sctp_lport, sh->src_port, init_chk->init.initiate_tag,
6158	    port, over_addr,
6159	    mflowtype, mflowid,
6160	    SCTP_SO_NOT_LOCKED))) {
6161		SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak send error %d\n", error);
6162		if (error == ENOBUFS) {
6163			if (asoc != NULL) {
6164				asoc->ifp_had_enobuf = 1;
6165			}
6166			SCTP_STAT_INCR(sctps_lowlevelerr);
6167		}
6168	} else {
6169		if (asoc != NULL) {
6170			asoc->ifp_had_enobuf = 0;
6171		}
6172	}
6173	SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
6174}
6175
6176
6177static void
6178sctp_prune_prsctp(struct sctp_tcb *stcb,
6179    struct sctp_association *asoc,
6180    struct sctp_sndrcvinfo *srcv,
6181    int dataout)
6182{
6183	int freed_spc = 0;
6184	struct sctp_tmit_chunk *chk, *nchk;
6185
6186	SCTP_TCB_LOCK_ASSERT(stcb);
6187	if ((asoc->prsctp_supported) &&
6188	    (asoc->sent_queue_cnt_removeable > 0)) {
6189		TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
6190			/*
6191			 * Look for chunks marked with the PR_SCTP flag AND
6192			 * the buffer space flag. If the one being sent is
6193			 * equal or greater priority then purge the old one
6194			 * and free some space.
6195			 */
6196			if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6197				/*
6198				 * This one is PR-SCTP AND buffer space
6199				 * limited type
6200				 */
6201				if (chk->rec.data.timetodrop.tv_sec > (long)srcv->sinfo_timetolive) {
6202					/*
6203					 * Lower numbers equates to higher
6204					 * priority so if the one we are
6205					 * looking at has a larger
6206					 * priority we want to drop the data
6207					 * and NOT retransmit it.
6208					 */
6209					if (chk->data) {
6210						/*
6211						 * We release the book_size
6212						 * if the mbuf is here
6213						 */
6214						int ret_spc;
6215						uint8_t sent;
6216
6217						if (chk->sent > SCTP_DATAGRAM_UNSENT)
6218							sent = 1;
6219						else
6220							sent = 0;
6221						ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6222						    sent,
6223						    SCTP_SO_LOCKED);
6224						freed_spc += ret_spc;
6225						if (freed_spc >= dataout) {
6226							return;
6227						}
6228					}	/* if chunk was present */
6229				}	/* if of sufficient priority */
6230			}	/* if chunk has enabled */
6231		}		/* tailqforeach */
6232
6233		TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
6234			/* Here we must move to the sent queue and mark */
6235			if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6236				if (chk->rec.data.timetodrop.tv_sec > (long)srcv->sinfo_timetolive) {
6237					if (chk->data) {
6238						/*
6239						 * We release the book_size
6240						 * if the mbuf is here
6241						 */
6242						int ret_spc;
6243
6244						ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6245						    0, SCTP_SO_LOCKED);
6246
6247						freed_spc += ret_spc;
6248						if (freed_spc >= dataout) {
6249							return;
6250						}
6251					}	/* end if chk->data */
6252				}	/* end if right class */
6253			}	/* end if chk pr-sctp */
6254		}		/* tailqforeachsafe (chk) */
6255	}			/* if enabled in asoc */
6256}
6257
6258int
6259sctp_get_frag_point(struct sctp_tcb *stcb,
6260    struct sctp_association *asoc)
6261{
6262	int siz, ovh;
6263
6264	/*
6265	 * For endpoints that have both v6 and v4 addresses we must reserve
6266	 * room for the ipv6 header, for those that are only dealing with V4
6267	 * we use a larger frag point.
6268	 */
6269	if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
6270		ovh = SCTP_MIN_OVERHEAD;
6271	} else {
6272		ovh = SCTP_MIN_V4_OVERHEAD;
6273	}
6274	ovh += SCTP_DATA_CHUNK_OVERHEAD(stcb);
6275	if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
6276		siz = asoc->smallest_mtu - ovh;
6277	else
6278		siz = (stcb->asoc.sctp_frag_point - ovh);
6279	/*
6280	 * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
6281	 */
6282	/* A data chunk MUST fit in a cluster */
6283	/* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
6284	/* } */
6285
6286	/* adjust for an AUTH chunk if DATA requires auth */
6287	if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
6288		siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
6289
6290	if (siz % 4) {
6291		/* make it an even word boundary please */
6292		siz -= (siz % 4);
6293	}
6294	return (siz);
6295}
6296
6297static void
6298sctp_set_prsctp_policy(struct sctp_stream_queue_pending *sp)
6299{
6300	/*
6301	 * We assume that the user wants PR_SCTP_TTL if the user provides a
6302	 * positive lifetime but does not specify any PR_SCTP policy.
6303	 */
6304	if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
6305		sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6306	} else if (sp->timetolive > 0) {
6307		sp->sinfo_flags |= SCTP_PR_SCTP_TTL;
6308		sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6309	} else {
6310		return;
6311	}
6312	switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
6313	case CHUNK_FLAGS_PR_SCTP_BUF:
6314		/*
6315		 * Time to live is a priority stored in tv_sec when doing
6316		 * the buffer drop thing.
6317		 */
6318		sp->ts.tv_sec = sp->timetolive;
6319		sp->ts.tv_usec = 0;
6320		break;
6321	case CHUNK_FLAGS_PR_SCTP_TTL:
6322		{
6323			struct timeval tv;
6324
6325			(void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6326			tv.tv_sec = sp->timetolive / 1000;
6327			tv.tv_usec = (sp->timetolive * 1000) % 1000000;
6328			/*
6329			 * TODO sctp_constants.h needs alternative time
6330			 * macros when _KERNEL is undefined.
6331			 */
6332			timevaladd(&sp->ts, &tv);
6333		}
6334		break;
6335	case CHUNK_FLAGS_PR_SCTP_RTX:
6336		/*
6337		 * Time to live is a the number or retransmissions stored in
6338		 * tv_sec.
6339		 */
6340		sp->ts.tv_sec = sp->timetolive;
6341		sp->ts.tv_usec = 0;
6342		break;
6343	default:
6344		SCTPDBG(SCTP_DEBUG_USRREQ1,
6345		    "Unknown PR_SCTP policy %u.\n",
6346		    PR_SCTP_POLICY(sp->sinfo_flags));
6347		break;
6348	}
6349}
6350
6351static int
6352sctp_msg_append(struct sctp_tcb *stcb,
6353    struct sctp_nets *net,
6354    struct mbuf *m,
6355    struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
6356{
6357	int error = 0;
6358	struct mbuf *at;
6359	struct sctp_stream_queue_pending *sp = NULL;
6360	struct sctp_stream_out *strm;
6361
6362	/*
6363	 * Given an mbuf chain, put it into the association send queue and
6364	 * place it on the wheel
6365	 */
6366	if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
6367		/* Invalid stream number */
6368		SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6369		error = EINVAL;
6370		goto out_now;
6371	}
6372	if ((stcb->asoc.stream_locked) &&
6373	    (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
6374		SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6375		error = EINVAL;
6376		goto out_now;
6377	}
6378	strm = &stcb->asoc.strmout[srcv->sinfo_stream];
6379	/* Now can we send this? */
6380	if ((SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) ||
6381	    (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
6382	    (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
6383	    (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
6384		/* got data while shutting down */
6385		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
6386		error = ECONNRESET;
6387		goto out_now;
6388	}
6389	sctp_alloc_a_strmoq(stcb, sp);
6390	if (sp == NULL) {
6391		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6392		error = ENOMEM;
6393		goto out_now;
6394	}
6395	sp->sinfo_flags = srcv->sinfo_flags;
6396	sp->timetolive = srcv->sinfo_timetolive;
6397	sp->ppid = srcv->sinfo_ppid;
6398	sp->context = srcv->sinfo_context;
6399	sp->fsn = 0;
6400	if (sp->sinfo_flags & SCTP_ADDR_OVER) {
6401		sp->net = net;
6402		atomic_add_int(&sp->net->ref_count, 1);
6403	} else {
6404		sp->net = NULL;
6405	}
6406	(void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6407	sp->sid = srcv->sinfo_stream;
6408	sp->msg_is_complete = 1;
6409	sp->sender_all_done = 1;
6410	sp->some_taken = 0;
6411	sp->data = m;
6412	sp->tail_mbuf = NULL;
6413	sctp_set_prsctp_policy(sp);
6414	/*
6415	 * We could in theory (for sendall) sifa the length in, but we would
6416	 * still have to hunt through the chain since we need to setup the
6417	 * tail_mbuf
6418	 */
6419	sp->length = 0;
6420	for (at = m; at; at = SCTP_BUF_NEXT(at)) {
6421		if (SCTP_BUF_NEXT(at) == NULL)
6422			sp->tail_mbuf = at;
6423		sp->length += SCTP_BUF_LEN(at);
6424	}
6425	if (srcv->sinfo_keynumber_valid) {
6426		sp->auth_keyid = srcv->sinfo_keynumber;
6427	} else {
6428		sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
6429	}
6430	if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
6431		sctp_auth_key_acquire(stcb, sp->auth_keyid);
6432		sp->holds_key_ref = 1;
6433	}
6434	if (hold_stcb_lock == 0) {
6435		SCTP_TCB_SEND_LOCK(stcb);
6436	}
6437	sctp_snd_sb_alloc(stcb, sp->length);
6438	atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
6439	TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
6440	stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, &stcb->asoc, strm, sp, 1);
6441	m = NULL;
6442	if (hold_stcb_lock == 0) {
6443		SCTP_TCB_SEND_UNLOCK(stcb);
6444	}
6445out_now:
6446	if (m) {
6447		sctp_m_freem(m);
6448	}
6449	return (error);
6450}
6451
6452
6453static struct mbuf *
6454sctp_copy_mbufchain(struct mbuf *clonechain,
6455    struct mbuf *outchain,
6456    struct mbuf **endofchain,
6457    int can_take_mbuf,
6458    int sizeofcpy,
6459    uint8_t copy_by_ref)
6460{
6461	struct mbuf *m;
6462	struct mbuf *appendchain;
6463	caddr_t cp;
6464	int len;
6465
6466	if (endofchain == NULL) {
6467		/* error */
6468error_out:
6469		if (outchain)
6470			sctp_m_freem(outchain);
6471		return (NULL);
6472	}
6473	if (can_take_mbuf) {
6474		appendchain = clonechain;
6475	} else {
6476		if (!copy_by_ref &&
6477		    (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))
6478		    ) {
6479			/* Its not in a cluster */
6480			if (*endofchain == NULL) {
6481				/* lets get a mbuf cluster */
6482				if (outchain == NULL) {
6483					/* This is the general case */
6484			new_mbuf:
6485					outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6486					if (outchain == NULL) {
6487						goto error_out;
6488					}
6489					SCTP_BUF_LEN(outchain) = 0;
6490					*endofchain = outchain;
6491					/* get the prepend space */
6492					SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
6493				} else {
6494					/*
6495					 * We really should not get a NULL
6496					 * in endofchain
6497					 */
6498					/* find end */
6499					m = outchain;
6500					while (m) {
6501						if (SCTP_BUF_NEXT(m) == NULL) {
6502							*endofchain = m;
6503							break;
6504						}
6505						m = SCTP_BUF_NEXT(m);
6506					}
6507					/* sanity */
6508					if (*endofchain == NULL) {
6509						/*
6510						 * huh, TSNH XXX maybe we
6511						 * should panic
6512						 */
6513						sctp_m_freem(outchain);
6514						goto new_mbuf;
6515					}
6516				}
6517				/* get the new end of length */
6518				len = (int)M_TRAILINGSPACE(*endofchain);
6519			} else {
6520				/* how much is left at the end? */
6521				len = (int)M_TRAILINGSPACE(*endofchain);
6522			}
6523			/* Find the end of the data, for appending */
6524			cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
6525
6526			/* Now lets copy it out */
6527			if (len >= sizeofcpy) {
6528				/* It all fits, copy it in */
6529				m_copydata(clonechain, 0, sizeofcpy, cp);
6530				SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6531			} else {
6532				/* fill up the end of the chain */
6533				if (len > 0) {
6534					m_copydata(clonechain, 0, len, cp);
6535					SCTP_BUF_LEN((*endofchain)) += len;
6536					/* now we need another one */
6537					sizeofcpy -= len;
6538				}
6539				m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6540				if (m == NULL) {
6541					/* We failed */
6542					goto error_out;
6543				}
6544				SCTP_BUF_NEXT((*endofchain)) = m;
6545				*endofchain = m;
6546				cp = mtod((*endofchain), caddr_t);
6547				m_copydata(clonechain, len, sizeofcpy, cp);
6548				SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6549			}
6550			return (outchain);
6551		} else {
6552			/* copy the old fashion way */
6553			appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_NOWAIT);
6554#ifdef SCTP_MBUF_LOGGING
6555			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6556				sctp_log_mbc(appendchain, SCTP_MBUF_ICOPY);
6557			}
6558#endif
6559		}
6560	}
6561	if (appendchain == NULL) {
6562		/* error */
6563		if (outchain)
6564			sctp_m_freem(outchain);
6565		return (NULL);
6566	}
6567	if (outchain) {
6568		/* tack on to the end */
6569		if (*endofchain != NULL) {
6570			SCTP_BUF_NEXT(((*endofchain))) = appendchain;
6571		} else {
6572			m = outchain;
6573			while (m) {
6574				if (SCTP_BUF_NEXT(m) == NULL) {
6575					SCTP_BUF_NEXT(m) = appendchain;
6576					break;
6577				}
6578				m = SCTP_BUF_NEXT(m);
6579			}
6580		}
6581		/*
6582		 * save off the end and update the end-chain position
6583		 */
6584		m = appendchain;
6585		while (m) {
6586			if (SCTP_BUF_NEXT(m) == NULL) {
6587				*endofchain = m;
6588				break;
6589			}
6590			m = SCTP_BUF_NEXT(m);
6591		}
6592		return (outchain);
6593	} else {
6594		/* save off the end and update the end-chain position */
6595		m = appendchain;
6596		while (m) {
6597			if (SCTP_BUF_NEXT(m) == NULL) {
6598				*endofchain = m;
6599				break;
6600			}
6601			m = SCTP_BUF_NEXT(m);
6602		}
6603		return (appendchain);
6604	}
6605}
6606
6607static int
6608sctp_med_chunk_output(struct sctp_inpcb *inp,
6609    struct sctp_tcb *stcb,
6610    struct sctp_association *asoc,
6611    int *num_out,
6612    int *reason_code,
6613    int control_only, int from_where,
6614    struct timeval *now, int *now_filled, int frag_point, int so_locked
6615#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6616    SCTP_UNUSED
6617#endif
6618);
6619
6620static void
6621sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
6622    uint32_t val SCTP_UNUSED)
6623{
6624	struct sctp_copy_all *ca;
6625	struct mbuf *m;
6626	int ret = 0;
6627	int added_control = 0;
6628	int un_sent, do_chunk_output = 1;
6629	struct sctp_association *asoc;
6630	struct sctp_nets *net;
6631
6632	ca = (struct sctp_copy_all *)ptr;
6633	if (ca->m == NULL) {
6634		return;
6635	}
6636	if (ca->inp != inp) {
6637		/* TSNH */
6638		return;
6639	}
6640	if (ca->sndlen > 0) {
6641		m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_NOWAIT);
6642		if (m == NULL) {
6643			/* can't copy so we are done */
6644			ca->cnt_failed++;
6645			return;
6646		}
6647#ifdef SCTP_MBUF_LOGGING
6648		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6649			sctp_log_mbc(m, SCTP_MBUF_ICOPY);
6650		}
6651#endif
6652	} else {
6653		m = NULL;
6654	}
6655	SCTP_TCB_LOCK_ASSERT(stcb);
6656	if (stcb->asoc.alternate) {
6657		net = stcb->asoc.alternate;
6658	} else {
6659		net = stcb->asoc.primary_destination;
6660	}
6661	if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
6662		/* Abort this assoc with m as the user defined reason */
6663		if (m != NULL) {
6664			SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_NOWAIT);
6665		} else {
6666			m = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
6667			    0, M_NOWAIT, 1, MT_DATA);
6668			SCTP_BUF_LEN(m) = sizeof(struct sctp_paramhdr);
6669		}
6670		if (m != NULL) {
6671			struct sctp_paramhdr *ph;
6672
6673			ph = mtod(m, struct sctp_paramhdr *);
6674			ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
6675			ph->param_length = htons((uint16_t)(sizeof(struct sctp_paramhdr) + ca->sndlen));
6676		}
6677		/*
6678		 * We add one here to keep the assoc from dis-appearing on
6679		 * us.
6680		 */
6681		atomic_add_int(&stcb->asoc.refcnt, 1);
6682		sctp_abort_an_association(inp, stcb, m, SCTP_SO_NOT_LOCKED);
6683		/*
6684		 * sctp_abort_an_association calls sctp_free_asoc() free
6685		 * association will NOT free it since we incremented the
6686		 * refcnt .. we do this to prevent it being freed and things
6687		 * getting tricky since we could end up (from free_asoc)
6688		 * calling inpcb_free which would get a recursive lock call
6689		 * to the iterator lock.. But as a consequence of that the
6690		 * stcb will return to us un-locked.. since free_asoc
6691		 * returns with either no TCB or the TCB unlocked, we must
6692		 * relock.. to unlock in the iterator timer :-0
6693		 */
6694		SCTP_TCB_LOCK(stcb);
6695		atomic_add_int(&stcb->asoc.refcnt, -1);
6696		goto no_chunk_output;
6697	} else {
6698		if (m) {
6699			ret = sctp_msg_append(stcb, net, m,
6700			    &ca->sndrcv, 1);
6701		}
6702		asoc = &stcb->asoc;
6703		if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
6704			/* shutdown this assoc */
6705			if (TAILQ_EMPTY(&asoc->send_queue) &&
6706			    TAILQ_EMPTY(&asoc->sent_queue) &&
6707			    sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED) == 0) {
6708				if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
6709					goto abort_anyway;
6710				}
6711				/*
6712				 * there is nothing queued to send, so I'm
6713				 * done...
6714				 */
6715				if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
6716				    (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6717				    (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6718					/*
6719					 * only send SHUTDOWN the first time
6720					 * through
6721					 */
6722					if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
6723						SCTP_STAT_DECR_GAUGE32(sctps_currestab);
6724					}
6725					SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_SENT);
6726					SCTP_CLEAR_SUBSTATE(stcb, SCTP_STATE_SHUTDOWN_PENDING);
6727					sctp_stop_timers_for_shutdown(stcb);
6728					sctp_send_shutdown(stcb, net);
6729					sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
6730					    net);
6731					sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6732					    asoc->primary_destination);
6733					added_control = 1;
6734					do_chunk_output = 0;
6735				}
6736			} else {
6737				/*
6738				 * we still got (or just got) data to send,
6739				 * so set SHUTDOWN_PENDING
6740				 */
6741				/*
6742				 * XXX sockets draft says that SCTP_EOF
6743				 * should be sent with no data.  currently,
6744				 * we will allow user data to be sent first
6745				 * and move to SHUTDOWN-PENDING
6746				 */
6747				if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
6748				    (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6749				    (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6750					if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
6751						SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_PARTIAL_MSG_LEFT);
6752					}
6753					SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_SHUTDOWN_PENDING);
6754					if (TAILQ_EMPTY(&asoc->send_queue) &&
6755					    TAILQ_EMPTY(&asoc->sent_queue) &&
6756					    (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
6757						struct mbuf *op_err;
6758						char msg[SCTP_DIAG_INFO_LEN];
6759
6760				abort_anyway:
6761						snprintf(msg, sizeof(msg),
6762						    "%s:%d at %s", __FILE__, __LINE__, __func__);
6763						op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
6764						    msg);
6765						atomic_add_int(&stcb->asoc.refcnt, 1);
6766						sctp_abort_an_association(stcb->sctp_ep, stcb,
6767						    op_err, SCTP_SO_NOT_LOCKED);
6768						atomic_add_int(&stcb->asoc.refcnt, -1);
6769						goto no_chunk_output;
6770					}
6771					sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6772					    asoc->primary_destination);
6773				}
6774			}
6775
6776		}
6777	}
6778	un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
6779	    (stcb->asoc.stream_queue_cnt * SCTP_DATA_CHUNK_OVERHEAD(stcb)));
6780
6781	if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
6782	    (stcb->asoc.total_flight > 0) &&
6783	    (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
6784		do_chunk_output = 0;
6785	}
6786	if (do_chunk_output)
6787		sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
6788	else if (added_control) {
6789		int num_out, reason, now_filled = 0;
6790		struct timeval now;
6791		int frag_point;
6792
6793		frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
6794		(void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
6795		    &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
6796	}
6797no_chunk_output:
6798	if (ret) {
6799		ca->cnt_failed++;
6800	} else {
6801		ca->cnt_sent++;
6802	}
6803}
6804
6805static void
6806sctp_sendall_completes(void *ptr, uint32_t val SCTP_UNUSED)
6807{
6808	struct sctp_copy_all *ca;
6809
6810	ca = (struct sctp_copy_all *)ptr;
6811	/*
6812	 * Do a notify here? Kacheong suggests that the notify be done at
6813	 * the send time.. so you would push up a notification if any send
6814	 * failed. Don't know if this is feasible since the only failures we
6815	 * have is "memory" related and if you cannot get an mbuf to send
6816	 * the data you surely can't get an mbuf to send up to notify the
6817	 * user you can't send the data :->
6818	 */
6819
6820	/* now free everything */
6821	if (ca->inp) {
6822		/* Lets clear the flag to allow others to run. */
6823		ca->inp->sctp_flags &= ~SCTP_PCB_FLAGS_SND_ITERATOR_UP;
6824	}
6825	sctp_m_freem(ca->m);
6826	SCTP_FREE(ca, SCTP_M_COPYAL);
6827}
6828
6829static struct mbuf *
6830sctp_copy_out_all(struct uio *uio, ssize_t len)
6831{
6832	struct mbuf *ret, *at;
6833	ssize_t left, willcpy, cancpy, error;
6834
6835	ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAITOK, 1, MT_DATA);
6836	if (ret == NULL) {
6837		/* TSNH */
6838		return (NULL);
6839	}
6840	left = len;
6841	SCTP_BUF_LEN(ret) = 0;
6842	/* save space for the data chunk header */
6843	cancpy = (int)M_TRAILINGSPACE(ret);
6844	willcpy = min(cancpy, left);
6845	at = ret;
6846	while (left > 0) {
6847		/* Align data to the end */
6848		error = uiomove(mtod(at, caddr_t), (int)willcpy, uio);
6849		if (error) {
6850	err_out_now:
6851			sctp_m_freem(at);
6852			return (NULL);
6853		}
6854		SCTP_BUF_LEN(at) = (int)willcpy;
6855		SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
6856		left -= willcpy;
6857		if (left > 0) {
6858			SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg((unsigned int)left, 0, M_WAITOK, 1, MT_DATA);
6859			if (SCTP_BUF_NEXT(at) == NULL) {
6860				goto err_out_now;
6861			}
6862			at = SCTP_BUF_NEXT(at);
6863			SCTP_BUF_LEN(at) = 0;
6864			cancpy = (int)M_TRAILINGSPACE(at);
6865			willcpy = min(cancpy, left);
6866		}
6867	}
6868	return (ret);
6869}
6870
6871static int
6872sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
6873    struct sctp_sndrcvinfo *srcv)
6874{
6875	int ret;
6876	struct sctp_copy_all *ca;
6877
6878	if (inp->sctp_flags & SCTP_PCB_FLAGS_SND_ITERATOR_UP) {
6879		/* There is another. */
6880		return (EBUSY);
6881	}
6882	if (uio->uio_resid > SCTP_MAX_SENDALL_LIMIT) {
6883		/* You must be less than the max! */
6884		return (EMSGSIZE);
6885	}
6886	SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
6887	    SCTP_M_COPYAL);
6888	if (ca == NULL) {
6889		sctp_m_freem(m);
6890		SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6891		return (ENOMEM);
6892	}
6893	memset(ca, 0, sizeof(struct sctp_copy_all));
6894
6895	ca->inp = inp;
6896	if (srcv) {
6897		memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
6898	}
6899	/*
6900	 * take off the sendall flag, it would be bad if we failed to do
6901	 * this :-0
6902	 */
6903	ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
6904	/* get length and mbuf chain */
6905	if (uio) {
6906		ca->sndlen = uio->uio_resid;
6907		ca->m = sctp_copy_out_all(uio, ca->sndlen);
6908		if (ca->m == NULL) {
6909			SCTP_FREE(ca, SCTP_M_COPYAL);
6910			SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6911			return (ENOMEM);
6912		}
6913	} else {
6914		/* Gather the length of the send */
6915		struct mbuf *mat;
6916
6917		ca->sndlen = 0;
6918		for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
6919			ca->sndlen += SCTP_BUF_LEN(mat);
6920		}
6921	}
6922	inp->sctp_flags |= SCTP_PCB_FLAGS_SND_ITERATOR_UP;
6923	ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
6924	    SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
6925	    SCTP_ASOC_ANY_STATE,
6926	    (void *)ca, 0,
6927	    sctp_sendall_completes, inp, 1);
6928	if (ret) {
6929		inp->sctp_flags &= ~SCTP_PCB_FLAGS_SND_ITERATOR_UP;
6930		SCTP_FREE(ca, SCTP_M_COPYAL);
6931		SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
6932		return (EFAULT);
6933	}
6934	return (0);
6935}
6936
6937
6938void
6939sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
6940{
6941	struct sctp_tmit_chunk *chk, *nchk;
6942
6943	TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6944		if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
6945			TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6946			asoc->ctrl_queue_cnt--;
6947			if (chk->data) {
6948				sctp_m_freem(chk->data);
6949				chk->data = NULL;
6950			}
6951			sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6952		}
6953	}
6954}
6955
6956void
6957sctp_toss_old_asconf(struct sctp_tcb *stcb)
6958{
6959	struct sctp_association *asoc;
6960	struct sctp_tmit_chunk *chk, *nchk;
6961	struct sctp_asconf_chunk *acp;
6962
6963	asoc = &stcb->asoc;
6964	TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
6965		/* find SCTP_ASCONF chunk in queue */
6966		if (chk->rec.chunk_id.id == SCTP_ASCONF) {
6967			if (chk->data) {
6968				acp = mtod(chk->data, struct sctp_asconf_chunk *);
6969				if (SCTP_TSN_GT(ntohl(acp->serial_number), asoc->asconf_seq_out_acked)) {
6970					/* Not Acked yet */
6971					break;
6972				}
6973			}
6974			TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
6975			asoc->ctrl_queue_cnt--;
6976			if (chk->data) {
6977				sctp_m_freem(chk->data);
6978				chk->data = NULL;
6979			}
6980			sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6981		}
6982	}
6983}
6984
6985
6986static void
6987sctp_clean_up_datalist(struct sctp_tcb *stcb,
6988    struct sctp_association *asoc,
6989    struct sctp_tmit_chunk **data_list,
6990    int bundle_at,
6991    struct sctp_nets *net)
6992{
6993	int i;
6994	struct sctp_tmit_chunk *tp1;
6995
6996	for (i = 0; i < bundle_at; i++) {
6997		/* off of the send queue */
6998		TAILQ_REMOVE(&asoc->send_queue, data_list[i], sctp_next);
6999		asoc->send_queue_cnt--;
7000		if (i > 0) {
7001			/*
7002			 * Any chunk NOT 0 you zap the time chunk 0 gets
7003			 * zapped or set based on if a RTO measurment is
7004			 * needed.
7005			 */
7006			data_list[i]->do_rtt = 0;
7007		}
7008		/* record time */
7009		data_list[i]->sent_rcv_time = net->last_sent_time;
7010		data_list[i]->rec.data.cwnd_at_send = net->cwnd;
7011		data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.tsn;
7012		if (data_list[i]->whoTo == NULL) {
7013			data_list[i]->whoTo = net;
7014			atomic_add_int(&net->ref_count, 1);
7015		}
7016		/* on to the sent queue */
7017		tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
7018		if ((tp1) && SCTP_TSN_GT(tp1->rec.data.tsn, data_list[i]->rec.data.tsn)) {
7019			struct sctp_tmit_chunk *tpp;
7020
7021			/* need to move back */
7022	back_up_more:
7023			tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
7024			if (tpp == NULL) {
7025				TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
7026				goto all_done;
7027			}
7028			tp1 = tpp;
7029			if (SCTP_TSN_GT(tp1->rec.data.tsn, data_list[i]->rec.data.tsn)) {
7030				goto back_up_more;
7031			}
7032			TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
7033		} else {
7034			TAILQ_INSERT_TAIL(&asoc->sent_queue,
7035			    data_list[i],
7036			    sctp_next);
7037		}
7038all_done:
7039		/* This does not lower until the cum-ack passes it */
7040		asoc->sent_queue_cnt++;
7041		if ((asoc->peers_rwnd <= 0) &&
7042		    (asoc->total_flight == 0) &&
7043		    (bundle_at == 1)) {
7044			/* Mark the chunk as being a window probe */
7045			SCTP_STAT_INCR(sctps_windowprobed);
7046		}
7047#ifdef SCTP_AUDITING_ENABLED
7048		sctp_audit_log(0xC2, 3);
7049#endif
7050		data_list[i]->sent = SCTP_DATAGRAM_SENT;
7051		data_list[i]->snd_count = 1;
7052		data_list[i]->rec.data.chunk_was_revoked = 0;
7053		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
7054			sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
7055			    data_list[i]->whoTo->flight_size,
7056			    data_list[i]->book_size,
7057			    (uint32_t)(uintptr_t)data_list[i]->whoTo,
7058			    data_list[i]->rec.data.tsn);
7059		}
7060		sctp_flight_size_increase(data_list[i]);
7061		sctp_total_flight_increase(stcb, data_list[i]);
7062		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
7063			sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
7064			    asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
7065		}
7066		asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
7067		    (uint32_t)(data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
7068		if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
7069			/* SWS sender side engages */
7070			asoc->peers_rwnd = 0;
7071		}
7072	}
7073	if (asoc->cc_functions.sctp_cwnd_update_packet_transmitted) {
7074		(*asoc->cc_functions.sctp_cwnd_update_packet_transmitted) (stcb, net);
7075	}
7076}
7077
7078static void
7079sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc, int so_locked
7080#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7081    SCTP_UNUSED
7082#endif
7083)
7084{
7085	struct sctp_tmit_chunk *chk, *nchk;
7086
7087	TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
7088		if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7089		    (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||	/* EY */
7090		    (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
7091		    (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
7092		    (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) ||
7093		    (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
7094		    (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
7095		    (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
7096		    (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
7097		    (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
7098		    (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
7099		    (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
7100			/* Stray chunks must be cleaned up */
7101	clean_up_anyway:
7102			TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
7103			asoc->ctrl_queue_cnt--;
7104			if (chk->data) {
7105				sctp_m_freem(chk->data);
7106				chk->data = NULL;
7107			}
7108			if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
7109				asoc->fwd_tsn_cnt--;
7110			}
7111			sctp_free_a_chunk(stcb, chk, so_locked);
7112		} else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
7113			/* special handling, we must look into the param */
7114			if (chk != asoc->str_reset) {
7115				goto clean_up_anyway;
7116			}
7117		}
7118	}
7119}
7120
7121static uint32_t
7122sctp_can_we_split_this(struct sctp_tcb *stcb, uint32_t length,
7123    uint32_t space_left, uint32_t frag_point, int eeor_on)
7124{
7125	/*
7126	 * Make a decision on if I should split a msg into multiple parts.
7127	 * This is only asked of incomplete messages.
7128	 */
7129	if (eeor_on) {
7130		/*
7131		 * If we are doing EEOR we need to always send it if its the
7132		 * entire thing, since it might be all the guy is putting in
7133		 * the hopper.
7134		 */
7135		if (space_left >= length) {
7136			/*-
7137			 * If we have data outstanding,
7138			 * we get another chance when the sack
7139			 * arrives to transmit - wait for more data
7140			 */
7141			if (stcb->asoc.total_flight == 0) {
7142				/*
7143				 * If nothing is in flight, we zero the
7144				 * packet counter.
7145				 */
7146				return (length);
7147			}
7148			return (0);
7149
7150		} else {
7151			/* You can fill the rest */
7152			return (space_left);
7153		}
7154	}
7155	/*-
7156	 * For those strange folk that make the send buffer
7157	 * smaller than our fragmentation point, we can't
7158	 * get a full msg in so we have to allow splitting.
7159	 */
7160	if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
7161		return (length);
7162	}
7163	if ((length <= space_left) ||
7164	    ((length - space_left) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
7165		/* Sub-optimial residual don't split in non-eeor mode. */
7166		return (0);
7167	}
7168	/*
7169	 * If we reach here length is larger than the space_left. Do we wish
7170	 * to split it for the sake of packet putting together?
7171	 */
7172	if (space_left >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
7173		/* Its ok to split it */
7174		return (min(space_left, frag_point));
7175	}
7176	/* Nope, can't split */
7177	return (0);
7178}
7179
7180static uint32_t
7181sctp_move_to_outqueue(struct sctp_tcb *stcb,
7182    struct sctp_stream_out *strq,
7183    uint32_t space_left,
7184    uint32_t frag_point,
7185    int *giveup,
7186    int eeor_mode,
7187    int *bail,
7188    int so_locked
7189#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7190    SCTP_UNUSED
7191#endif
7192)
7193{
7194	/* Move from the stream to the send_queue keeping track of the total */
7195	struct sctp_association *asoc;
7196	struct sctp_stream_queue_pending *sp;
7197	struct sctp_tmit_chunk *chk;
7198	struct sctp_data_chunk *dchkh = NULL;
7199	struct sctp_idata_chunk *ndchkh = NULL;
7200	uint32_t to_move, length;
7201	int leading;
7202	uint8_t rcv_flags = 0;
7203	uint8_t some_taken;
7204	uint8_t send_lock_up = 0;
7205
7206	SCTP_TCB_LOCK_ASSERT(stcb);
7207	asoc = &stcb->asoc;
7208one_more_time:
7209	/* sa_ignore FREED_MEMORY */
7210	sp = TAILQ_FIRST(&strq->outqueue);
7211	if (sp == NULL) {
7212		if (send_lock_up == 0) {
7213			SCTP_TCB_SEND_LOCK(stcb);
7214			send_lock_up = 1;
7215		}
7216		sp = TAILQ_FIRST(&strq->outqueue);
7217		if (sp) {
7218			goto one_more_time;
7219		}
7220		if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_EXPLICIT_EOR) == 0) &&
7221		    (stcb->asoc.idata_supported == 0) &&
7222		    (strq->last_msg_incomplete)) {
7223			SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
7224			    strq->sid,
7225			    strq->last_msg_incomplete);
7226			strq->last_msg_incomplete = 0;
7227		}
7228		to_move = 0;
7229		if (send_lock_up) {
7230			SCTP_TCB_SEND_UNLOCK(stcb);
7231			send_lock_up = 0;
7232		}
7233		goto out_of;
7234	}
7235	if ((sp->msg_is_complete) && (sp->length == 0)) {
7236		if (sp->sender_all_done) {
7237			/*
7238			 * We are doing differed cleanup. Last time through
7239			 * when we took all the data the sender_all_done was
7240			 * not set.
7241			 */
7242			if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
7243				SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
7244				SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7245				    sp->sender_all_done,
7246				    sp->length,
7247				    sp->msg_is_complete,
7248				    sp->put_last_out,
7249				    send_lock_up);
7250			}
7251			if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
7252				SCTP_TCB_SEND_LOCK(stcb);
7253				send_lock_up = 1;
7254			}
7255			atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7256			TAILQ_REMOVE(&strq->outqueue, sp, next);
7257			stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7258			if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
7259			    (strq->chunks_on_queues == 0) &&
7260			    TAILQ_EMPTY(&strq->outqueue)) {
7261				stcb->asoc.trigger_reset = 1;
7262			}
7263			if (sp->net) {
7264				sctp_free_remote_addr(sp->net);
7265				sp->net = NULL;
7266			}
7267			if (sp->data) {
7268				sctp_m_freem(sp->data);
7269				sp->data = NULL;
7270			}
7271			sctp_free_a_strmoq(stcb, sp, so_locked);
7272			/* we can't be locked to it */
7273			if (send_lock_up) {
7274				SCTP_TCB_SEND_UNLOCK(stcb);
7275				send_lock_up = 0;
7276			}
7277			/* back to get the next msg */
7278			goto one_more_time;
7279		} else {
7280			/*
7281			 * sender just finished this but still holds a
7282			 * reference
7283			 */
7284			*giveup = 1;
7285			to_move = 0;
7286			goto out_of;
7287		}
7288	} else {
7289		/* is there some to get */
7290		if (sp->length == 0) {
7291			/* no */
7292			*giveup = 1;
7293			to_move = 0;
7294			goto out_of;
7295		} else if (sp->discard_rest) {
7296			if (send_lock_up == 0) {
7297				SCTP_TCB_SEND_LOCK(stcb);
7298				send_lock_up = 1;
7299			}
7300			/* Whack down the size */
7301			atomic_subtract_int(&stcb->asoc.total_output_queue_size, sp->length);
7302			if ((stcb->sctp_socket != NULL) &&
7303			    ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
7304			    (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) {
7305				atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc, sp->length);
7306			}
7307			if (sp->data) {
7308				sctp_m_freem(sp->data);
7309				sp->data = NULL;
7310				sp->tail_mbuf = NULL;
7311			}
7312			sp->length = 0;
7313			sp->some_taken = 1;
7314			*giveup = 1;
7315			to_move = 0;
7316			goto out_of;
7317		}
7318	}
7319	some_taken = sp->some_taken;
7320re_look:
7321	length = sp->length;
7322	if (sp->msg_is_complete) {
7323		/* The message is complete */
7324		to_move = min(length, frag_point);
7325		if (to_move == length) {
7326			/* All of it fits in the MTU */
7327			if (sp->some_taken) {
7328				rcv_flags |= SCTP_DATA_LAST_FRAG;
7329			} else {
7330				rcv_flags |= SCTP_DATA_NOT_FRAG;
7331			}
7332			sp->put_last_out = 1;
7333			if (sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) {
7334				rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7335			}
7336		} else {
7337			/* Not all of it fits, we fragment */
7338			if (sp->some_taken == 0) {
7339				rcv_flags |= SCTP_DATA_FIRST_FRAG;
7340			}
7341			sp->some_taken = 1;
7342		}
7343	} else {
7344		to_move = sctp_can_we_split_this(stcb, length, space_left, frag_point, eeor_mode);
7345		if (to_move) {
7346			/*-
7347			 * We use a snapshot of length in case it
7348			 * is expanding during the compare.
7349			 */
7350			uint32_t llen;
7351
7352			llen = length;
7353			if (to_move >= llen) {
7354				to_move = llen;
7355				if (send_lock_up == 0) {
7356					/*-
7357					 * We are taking all of an incomplete msg
7358					 * thus we need a send lock.
7359					 */
7360					SCTP_TCB_SEND_LOCK(stcb);
7361					send_lock_up = 1;
7362					if (sp->msg_is_complete) {
7363						/*
7364						 * the sender finished the
7365						 * msg
7366						 */
7367						goto re_look;
7368					}
7369				}
7370			}
7371			if (sp->some_taken == 0) {
7372				rcv_flags |= SCTP_DATA_FIRST_FRAG;
7373				sp->some_taken = 1;
7374			}
7375		} else {
7376			/* Nothing to take. */
7377			*giveup = 1;
7378			to_move = 0;
7379			goto out_of;
7380		}
7381	}
7382
7383	/* If we reach here, we can copy out a chunk */
7384	sctp_alloc_a_chunk(stcb, chk);
7385	if (chk == NULL) {
7386		/* No chunk memory */
7387		*giveup = 1;
7388		to_move = 0;
7389		goto out_of;
7390	}
7391	/*
7392	 * Setup for unordered if needed by looking at the user sent info
7393	 * flags.
7394	 */
7395	if (sp->sinfo_flags & SCTP_UNORDERED) {
7396		rcv_flags |= SCTP_DATA_UNORDERED;
7397	}
7398	if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
7399	    (sp->sinfo_flags & SCTP_EOF) == SCTP_EOF) {
7400		rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7401	}
7402	/* clear out the chunk before setting up */
7403	memset(chk, 0, sizeof(*chk));
7404	chk->rec.data.rcv_flags = rcv_flags;
7405
7406	if (to_move >= length) {
7407		/* we think we can steal the whole thing */
7408		if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
7409			SCTP_TCB_SEND_LOCK(stcb);
7410			send_lock_up = 1;
7411		}
7412		if (to_move < sp->length) {
7413			/* bail, it changed */
7414			goto dont_do_it;
7415		}
7416		chk->data = sp->data;
7417		chk->last_mbuf = sp->tail_mbuf;
7418		/* register the stealing */
7419		sp->data = sp->tail_mbuf = NULL;
7420	} else {
7421		struct mbuf *m;
7422
7423dont_do_it:
7424		chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_NOWAIT);
7425		chk->last_mbuf = NULL;
7426		if (chk->data == NULL) {
7427			sp->some_taken = some_taken;
7428			sctp_free_a_chunk(stcb, chk, so_locked);
7429			*bail = 1;
7430			to_move = 0;
7431			goto out_of;
7432		}
7433#ifdef SCTP_MBUF_LOGGING
7434		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
7435			sctp_log_mbc(chk->data, SCTP_MBUF_ICOPY);
7436		}
7437#endif
7438		/* Pull off the data */
7439		m_adj(sp->data, to_move);
7440		/* Now lets work our way down and compact it */
7441		m = sp->data;
7442		while (m && (SCTP_BUF_LEN(m) == 0)) {
7443			sp->data = SCTP_BUF_NEXT(m);
7444			SCTP_BUF_NEXT(m) = NULL;
7445			if (sp->tail_mbuf == m) {
7446				/*-
7447				 * Freeing tail? TSNH since
7448				 * we supposedly were taking less
7449				 * than the sp->length.
7450				 */
7451#ifdef INVARIANTS
7452				panic("Huh, freing tail? - TSNH");
7453#else
7454				SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
7455				sp->tail_mbuf = sp->data = NULL;
7456				sp->length = 0;
7457#endif
7458
7459			}
7460			sctp_m_free(m);
7461			m = sp->data;
7462		}
7463	}
7464	if (SCTP_BUF_IS_EXTENDED(chk->data)) {
7465		chk->copy_by_ref = 1;
7466	} else {
7467		chk->copy_by_ref = 0;
7468	}
7469	/*
7470	 * get last_mbuf and counts of mb usage This is ugly but hopefully
7471	 * its only one mbuf.
7472	 */
7473	if (chk->last_mbuf == NULL) {
7474		chk->last_mbuf = chk->data;
7475		while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
7476			chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
7477		}
7478	}
7479
7480	if (to_move > length) {
7481		/*- This should not happen either
7482		 * since we always lower to_move to the size
7483		 * of sp->length if its larger.
7484		 */
7485#ifdef INVARIANTS
7486		panic("Huh, how can to_move be larger?");
7487#else
7488		SCTP_PRINTF("Huh, how can to_move be larger?\n");
7489		sp->length = 0;
7490#endif
7491	} else {
7492		atomic_subtract_int(&sp->length, to_move);
7493	}
7494	leading = SCTP_DATA_CHUNK_OVERHEAD(stcb);
7495	if (M_LEADINGSPACE(chk->data) < leading) {
7496		/* Not enough room for a chunk header, get some */
7497		struct mbuf *m;
7498
7499		m = sctp_get_mbuf_for_msg(1, 0, M_NOWAIT, 1, MT_DATA);
7500		if (m == NULL) {
7501			/*
7502			 * we're in trouble here. _PREPEND below will free
7503			 * all the data if there is no leading space, so we
7504			 * must put the data back and restore.
7505			 */
7506			if (send_lock_up == 0) {
7507				SCTP_TCB_SEND_LOCK(stcb);
7508				send_lock_up = 1;
7509			}
7510			if (sp->data == NULL) {
7511				/* unsteal the data */
7512				sp->data = chk->data;
7513				sp->tail_mbuf = chk->last_mbuf;
7514			} else {
7515				struct mbuf *m_tmp;
7516
7517				/* reassemble the data */
7518				m_tmp = sp->data;
7519				sp->data = chk->data;
7520				SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
7521			}
7522			sp->some_taken = some_taken;
7523			atomic_add_int(&sp->length, to_move);
7524			chk->data = NULL;
7525			*bail = 1;
7526			sctp_free_a_chunk(stcb, chk, so_locked);
7527			to_move = 0;
7528			goto out_of;
7529		} else {
7530			SCTP_BUF_LEN(m) = 0;
7531			SCTP_BUF_NEXT(m) = chk->data;
7532			chk->data = m;
7533			M_ALIGN(chk->data, 4);
7534		}
7535	}
7536	SCTP_BUF_PREPEND(chk->data, SCTP_DATA_CHUNK_OVERHEAD(stcb), M_NOWAIT);
7537	if (chk->data == NULL) {
7538		/* HELP, TSNH since we assured it would not above? */
7539#ifdef INVARIANTS
7540		panic("prepend failes HELP?");
7541#else
7542		SCTP_PRINTF("prepend fails HELP?\n");
7543		sctp_free_a_chunk(stcb, chk, so_locked);
7544#endif
7545		*bail = 1;
7546		to_move = 0;
7547		goto out_of;
7548	}
7549	sctp_snd_sb_alloc(stcb, SCTP_DATA_CHUNK_OVERHEAD(stcb));
7550	chk->book_size = chk->send_size = (uint16_t)(to_move + SCTP_DATA_CHUNK_OVERHEAD(stcb));
7551	chk->book_size_scale = 0;
7552	chk->sent = SCTP_DATAGRAM_UNSENT;
7553
7554	chk->flags = 0;
7555	chk->asoc = &stcb->asoc;
7556	chk->pad_inplace = 0;
7557	chk->no_fr_allowed = 0;
7558	if (stcb->asoc.idata_supported == 0) {
7559		if (rcv_flags & SCTP_DATA_UNORDERED) {
7560			/* Just use 0. The receiver ignores the values. */
7561			chk->rec.data.mid = 0;
7562		} else {
7563			chk->rec.data.mid = strq->next_mid_ordered;
7564			if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7565				strq->next_mid_ordered++;
7566			}
7567		}
7568	} else {
7569		if (rcv_flags & SCTP_DATA_UNORDERED) {
7570			chk->rec.data.mid = strq->next_mid_unordered;
7571			if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7572				strq->next_mid_unordered++;
7573			}
7574		} else {
7575			chk->rec.data.mid = strq->next_mid_ordered;
7576			if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7577				strq->next_mid_ordered++;
7578			}
7579		}
7580	}
7581	chk->rec.data.sid = sp->sid;
7582	chk->rec.data.ppid = sp->ppid;
7583	chk->rec.data.context = sp->context;
7584	chk->rec.data.doing_fast_retransmit = 0;
7585
7586	chk->rec.data.timetodrop = sp->ts;
7587	chk->flags = sp->act_flags;
7588
7589	if (sp->net) {
7590		chk->whoTo = sp->net;
7591		atomic_add_int(&chk->whoTo->ref_count, 1);
7592	} else
7593		chk->whoTo = NULL;
7594
7595	if (sp->holds_key_ref) {
7596		chk->auth_keyid = sp->auth_keyid;
7597		sctp_auth_key_acquire(stcb, chk->auth_keyid);
7598		chk->holds_key_ref = 1;
7599	}
7600	chk->rec.data.tsn = atomic_fetchadd_int(&asoc->sending_seq, 1);
7601	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
7602		sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
7603		    (uint32_t)(uintptr_t)stcb, sp->length,
7604		    (uint32_t)((chk->rec.data.sid << 16) | (0x0000ffff & chk->rec.data.mid)),
7605		    chk->rec.data.tsn);
7606	}
7607	if (stcb->asoc.idata_supported == 0) {
7608		dchkh = mtod(chk->data, struct sctp_data_chunk *);
7609	} else {
7610		ndchkh = mtod(chk->data, struct sctp_idata_chunk *);
7611	}
7612	/*
7613	 * Put the rest of the things in place now. Size was done earlier in
7614	 * previous loop prior to padding.
7615	 */
7616
7617#ifdef SCTP_ASOCLOG_OF_TSNS
7618	SCTP_TCB_LOCK_ASSERT(stcb);
7619	if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
7620		asoc->tsn_out_at = 0;
7621		asoc->tsn_out_wrapped = 1;
7622	}
7623	asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.tsn;
7624	asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.sid;
7625	asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.mid;
7626	asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
7627	asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
7628	asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
7629	asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
7630	asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
7631	asoc->tsn_out_at++;
7632#endif
7633	if (stcb->asoc.idata_supported == 0) {
7634		dchkh->ch.chunk_type = SCTP_DATA;
7635		dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7636		dchkh->dp.tsn = htonl(chk->rec.data.tsn);
7637		dchkh->dp.sid = htons(strq->sid);
7638		dchkh->dp.ssn = htons((uint16_t)chk->rec.data.mid);
7639		dchkh->dp.ppid = chk->rec.data.ppid;
7640		dchkh->ch.chunk_length = htons(chk->send_size);
7641	} else {
7642		ndchkh->ch.chunk_type = SCTP_IDATA;
7643		ndchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7644		ndchkh->dp.tsn = htonl(chk->rec.data.tsn);
7645		ndchkh->dp.sid = htons(strq->sid);
7646		ndchkh->dp.reserved = htons(0);
7647		ndchkh->dp.mid = htonl(chk->rec.data.mid);
7648		if (sp->fsn == 0)
7649			ndchkh->dp.ppid_fsn.ppid = chk->rec.data.ppid;
7650		else
7651			ndchkh->dp.ppid_fsn.fsn = htonl(sp->fsn);
7652		sp->fsn++;
7653		ndchkh->ch.chunk_length = htons(chk->send_size);
7654	}
7655	/* Now advance the chk->send_size by the actual pad needed. */
7656	if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
7657		/* need a pad */
7658		struct mbuf *lm;
7659		int pads;
7660
7661		pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
7662		lm = sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf);
7663		if (lm != NULL) {
7664			chk->last_mbuf = lm;
7665			chk->pad_inplace = 1;
7666		}
7667		chk->send_size += pads;
7668	}
7669	if (PR_SCTP_ENABLED(chk->flags)) {
7670		asoc->pr_sctp_cnt++;
7671	}
7672	if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
7673		/* All done pull and kill the message */
7674		if (sp->put_last_out == 0) {
7675			SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
7676			SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7677			    sp->sender_all_done,
7678			    sp->length,
7679			    sp->msg_is_complete,
7680			    sp->put_last_out,
7681			    send_lock_up);
7682		}
7683		if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
7684			SCTP_TCB_SEND_LOCK(stcb);
7685			send_lock_up = 1;
7686		}
7687		atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7688		TAILQ_REMOVE(&strq->outqueue, sp, next);
7689		stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7690		if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
7691		    (strq->chunks_on_queues == 0) &&
7692		    TAILQ_EMPTY(&strq->outqueue)) {
7693			stcb->asoc.trigger_reset = 1;
7694		}
7695		if (sp->net) {
7696			sctp_free_remote_addr(sp->net);
7697			sp->net = NULL;
7698		}
7699		if (sp->data) {
7700			sctp_m_freem(sp->data);
7701			sp->data = NULL;
7702		}
7703		sctp_free_a_strmoq(stcb, sp, so_locked);
7704	}
7705	asoc->chunks_on_out_queue++;
7706	strq->chunks_on_queues++;
7707	TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
7708	asoc->send_queue_cnt++;
7709out_of:
7710	if (send_lock_up) {
7711		SCTP_TCB_SEND_UNLOCK(stcb);
7712	}
7713	return (to_move);
7714}
7715
7716
7717static void
7718sctp_fill_outqueue(struct sctp_tcb *stcb,
7719    struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now, int so_locked
7720#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7721    SCTP_UNUSED
7722#endif
7723)
7724{
7725	struct sctp_association *asoc;
7726	struct sctp_stream_out *strq;
7727	uint32_t space_left, moved, total_moved;
7728	int bail, giveup;
7729
7730	SCTP_TCB_LOCK_ASSERT(stcb);
7731	asoc = &stcb->asoc;
7732	total_moved = 0;
7733	switch (net->ro._l_addr.sa.sa_family) {
7734#ifdef INET
7735	case AF_INET:
7736		space_left = net->mtu - SCTP_MIN_V4_OVERHEAD;
7737		break;
7738#endif
7739#ifdef INET6
7740	case AF_INET6:
7741		space_left = net->mtu - SCTP_MIN_OVERHEAD;
7742		break;
7743#endif
7744	default:
7745		/* TSNH */
7746		space_left = net->mtu;
7747		break;
7748	}
7749	/* Need an allowance for the data chunk header too */
7750	space_left -= SCTP_DATA_CHUNK_OVERHEAD(stcb);
7751
7752	/* must make even word boundary */
7753	space_left &= 0xfffffffc;
7754	strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7755	giveup = 0;
7756	bail = 0;
7757	while ((space_left > 0) && (strq != NULL)) {
7758		moved = sctp_move_to_outqueue(stcb, strq, space_left, frag_point,
7759		    &giveup, eeor_mode, &bail, so_locked);
7760		stcb->asoc.ss_functions.sctp_ss_scheduled(stcb, net, asoc, strq, moved);
7761		if ((giveup != 0) || (bail != 0)) {
7762			break;
7763		}
7764		strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7765		total_moved += moved;
7766		if (space_left >= moved) {
7767			space_left -= moved;
7768		} else {
7769			space_left = 0;
7770		}
7771		if (space_left >= SCTP_DATA_CHUNK_OVERHEAD(stcb)) {
7772			space_left -= SCTP_DATA_CHUNK_OVERHEAD(stcb);
7773		} else {
7774			space_left = 0;
7775		}
7776		space_left &= 0xfffffffc;
7777	}
7778	if (bail != 0)
7779		*quit_now = 1;
7780
7781	stcb->asoc.ss_functions.sctp_ss_packet_done(stcb, net, asoc);
7782
7783	if (total_moved == 0) {
7784		if ((stcb->asoc.sctp_cmt_on_off == 0) &&
7785		    (net == stcb->asoc.primary_destination)) {
7786			/* ran dry for primary network net */
7787			SCTP_STAT_INCR(sctps_primary_randry);
7788		} else if (stcb->asoc.sctp_cmt_on_off > 0) {
7789			/* ran dry with CMT on */
7790			SCTP_STAT_INCR(sctps_cmt_randry);
7791		}
7792	}
7793}
7794
7795void
7796sctp_fix_ecn_echo(struct sctp_association *asoc)
7797{
7798	struct sctp_tmit_chunk *chk;
7799
7800	TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7801		if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7802			chk->sent = SCTP_DATAGRAM_UNSENT;
7803		}
7804	}
7805}
7806
7807void
7808sctp_move_chunks_from_net(struct sctp_tcb *stcb, struct sctp_nets *net)
7809{
7810	struct sctp_association *asoc;
7811	struct sctp_tmit_chunk *chk;
7812	struct sctp_stream_queue_pending *sp;
7813	unsigned int i;
7814
7815	if (net == NULL) {
7816		return;
7817	}
7818	asoc = &stcb->asoc;
7819	for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
7820		TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
7821			if (sp->net == net) {
7822				sctp_free_remote_addr(sp->net);
7823				sp->net = NULL;
7824			}
7825		}
7826	}
7827	TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7828		if (chk->whoTo == net) {
7829			sctp_free_remote_addr(chk->whoTo);
7830			chk->whoTo = NULL;
7831		}
7832	}
7833}
7834
7835int
7836sctp_med_chunk_output(struct sctp_inpcb *inp,
7837    struct sctp_tcb *stcb,
7838    struct sctp_association *asoc,
7839    int *num_out,
7840    int *reason_code,
7841    int control_only, int from_where,
7842    struct timeval *now, int *now_filled, int frag_point, int so_locked
7843#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7844    SCTP_UNUSED
7845#endif
7846)
7847{
7848	/**
7849	 * Ok this is the generic chunk service queue. we must do the
7850	 * following:
7851	 * - Service the stream queue that is next, moving any
7852	 *   message (note I must get a complete message i.e. FIRST/MIDDLE and
7853	 *   LAST to the out queue in one pass) and assigning TSN's. This
7854	 *   only applys though if the peer does not support NDATA. For NDATA
7855	 *   chunks its ok to not send the entire message ;-)
7856	 * - Check to see if the cwnd/rwnd allows any output, if so we go ahead and
7857	 *   fomulate and send the low level chunks. Making sure to combine
7858	 *   any control in the control chunk queue also.
7859	 */
7860	struct sctp_nets *net, *start_at, *sack_goes_to = NULL, *old_start_at = NULL;
7861	struct mbuf *outchain, *endoutchain;
7862	struct sctp_tmit_chunk *chk, *nchk;
7863
7864	/* temp arrays for unlinking */
7865	struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
7866	int no_fragmentflg, error;
7867	unsigned int max_rwnd_per_dest, max_send_per_dest;
7868	int one_chunk, hbflag, skip_data_for_this_net;
7869	int asconf, cookie, no_out_cnt;
7870	int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
7871	unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
7872	int tsns_sent = 0;
7873	uint32_t auth_offset;
7874	struct sctp_auth_chunk *auth;
7875	uint16_t auth_keyid;
7876	int override_ok = 1;
7877	int skip_fill_up = 0;
7878	int data_auth_reqd = 0;
7879
7880	/*
7881	 * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
7882	 * destination.
7883	 */
7884	int quit_now = 0;
7885
7886	*num_out = 0;
7887	*reason_code = 0;
7888	auth_keyid = stcb->asoc.authinfo.active_keyid;
7889	if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
7890	    (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
7891	    (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
7892		eeor_mode = 1;
7893	} else {
7894		eeor_mode = 0;
7895	}
7896	ctl_cnt = no_out_cnt = asconf = cookie = 0;
7897	/*
7898	 * First lets prime the pump. For each destination, if there is room
7899	 * in the flight size, attempt to pull an MTU's worth out of the
7900	 * stream queues into the general send_queue
7901	 */
7902#ifdef SCTP_AUDITING_ENABLED
7903	sctp_audit_log(0xC2, 2);
7904#endif
7905	SCTP_TCB_LOCK_ASSERT(stcb);
7906	hbflag = 0;
7907	if (control_only)
7908		no_data_chunks = 1;
7909	else
7910		no_data_chunks = 0;
7911
7912	/* Nothing to possible to send? */
7913	if ((TAILQ_EMPTY(&asoc->control_send_queue) ||
7914	    (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) &&
7915	    TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7916	    TAILQ_EMPTY(&asoc->send_queue) &&
7917	    sctp_is_there_unsent_data(stcb, so_locked) == 0) {
7918nothing_to_send:
7919		*reason_code = 9;
7920		return (0);
7921	}
7922	if (asoc->peers_rwnd == 0) {
7923		/* No room in peers rwnd */
7924		*reason_code = 1;
7925		if (asoc->total_flight > 0) {
7926			/* we are allowed one chunk in flight */
7927			no_data_chunks = 1;
7928		}
7929	}
7930	if (stcb->asoc.ecn_echo_cnt_onq) {
7931		/* Record where a sack goes, if any */
7932		if (no_data_chunks &&
7933		    (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) {
7934			/* Nothing but ECNe to send - we don't do that */
7935			goto nothing_to_send;
7936		}
7937		TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7938			if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7939			    (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
7940				sack_goes_to = chk->whoTo;
7941				break;
7942			}
7943		}
7944	}
7945	max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
7946	if (stcb->sctp_socket)
7947		max_send_per_dest = SCTP_SB_LIMIT_SND(stcb->sctp_socket) / asoc->numnets;
7948	else
7949		max_send_per_dest = 0;
7950	if (no_data_chunks == 0) {
7951		/* How many non-directed chunks are there? */
7952		TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7953			if (chk->whoTo == NULL) {
7954				/*
7955				 * We already have non-directed chunks on
7956				 * the queue, no need to do a fill-up.
7957				 */
7958				skip_fill_up = 1;
7959				break;
7960			}
7961		}
7962
7963	}
7964	if ((no_data_chunks == 0) &&
7965	    (skip_fill_up == 0) &&
7966	    (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc))) {
7967		TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
7968			/*
7969			 * This for loop we are in takes in each net, if
7970			 * its's got space in cwnd and has data sent to it
7971			 * (when CMT is off) then it calls
7972			 * sctp_fill_outqueue for the net. This gets data on
7973			 * the send queue for that network.
7974			 *
7975			 * In sctp_fill_outqueue TSN's are assigned and data
7976			 * is copied out of the stream buffers. Note mostly
7977			 * copy by reference (we hope).
7978			 */
7979			net->window_probe = 0;
7980			if ((net != stcb->asoc.alternate) &&
7981			    ((net->dest_state & SCTP_ADDR_PF) ||
7982			    (!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
7983			    (net->dest_state & SCTP_ADDR_UNCONFIRMED))) {
7984				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7985					sctp_log_cwnd(stcb, net, 1,
7986					    SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7987				}
7988				continue;
7989			}
7990			if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
7991			    (net->flight_size == 0)) {
7992				(*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
7993			}
7994			if (net->flight_size >= net->cwnd) {
7995				/* skip this network, no room - can't fill */
7996				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7997					sctp_log_cwnd(stcb, net, 3,
7998					    SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7999				}
8000				continue;
8001			}
8002			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8003				sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
8004			}
8005			sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now, so_locked);
8006			if (quit_now) {
8007				/* memory alloc failure */
8008				no_data_chunks = 1;
8009				break;
8010			}
8011		}
8012	}
8013	/* now service each destination and send out what we can for it */
8014	/* Nothing to send? */
8015	if (TAILQ_EMPTY(&asoc->control_send_queue) &&
8016	    TAILQ_EMPTY(&asoc->asconf_send_queue) &&
8017	    TAILQ_EMPTY(&asoc->send_queue)) {
8018		*reason_code = 8;
8019		return (0);
8020	}
8021
8022	if (asoc->sctp_cmt_on_off > 0) {
8023		/* get the last start point */
8024		start_at = asoc->last_net_cmt_send_started;
8025		if (start_at == NULL) {
8026			/* null so to beginning */
8027			start_at = TAILQ_FIRST(&asoc->nets);
8028		} else {
8029			start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
8030			if (start_at == NULL) {
8031				start_at = TAILQ_FIRST(&asoc->nets);
8032			}
8033		}
8034		asoc->last_net_cmt_send_started = start_at;
8035	} else {
8036		start_at = TAILQ_FIRST(&asoc->nets);
8037	}
8038	TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
8039		if (chk->whoTo == NULL) {
8040			if (asoc->alternate) {
8041				chk->whoTo = asoc->alternate;
8042			} else {
8043				chk->whoTo = asoc->primary_destination;
8044			}
8045			atomic_add_int(&chk->whoTo->ref_count, 1);
8046		}
8047	}
8048	old_start_at = NULL;
8049again_one_more_time:
8050	for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
8051		/* how much can we send? */
8052		/* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
8053		if (old_start_at && (old_start_at == net)) {
8054			/* through list ocmpletely. */
8055			break;
8056		}
8057		tsns_sent = 0xa;
8058		if (TAILQ_EMPTY(&asoc->control_send_queue) &&
8059		    TAILQ_EMPTY(&asoc->asconf_send_queue) &&
8060		    (net->flight_size >= net->cwnd)) {
8061			/*
8062			 * Nothing on control or asconf and flight is full,
8063			 * we can skip even in the CMT case.
8064			 */
8065			continue;
8066		}
8067		bundle_at = 0;
8068		endoutchain = outchain = NULL;
8069		auth = NULL;
8070		auth_offset = 0;
8071		no_fragmentflg = 1;
8072		one_chunk = 0;
8073		if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
8074			skip_data_for_this_net = 1;
8075		} else {
8076			skip_data_for_this_net = 0;
8077		}
8078		switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8079#ifdef INET
8080		case AF_INET:
8081			mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8082			break;
8083#endif
8084#ifdef INET6
8085		case AF_INET6:
8086			mtu = net->mtu - SCTP_MIN_OVERHEAD;
8087			break;
8088#endif
8089		default:
8090			/* TSNH */
8091			mtu = net->mtu;
8092			break;
8093		}
8094		mx_mtu = mtu;
8095		to_out = 0;
8096		if (mtu > asoc->peers_rwnd) {
8097			if (asoc->total_flight > 0) {
8098				/* We have a packet in flight somewhere */
8099				r_mtu = asoc->peers_rwnd;
8100			} else {
8101				/* We are always allowed to send one MTU out */
8102				one_chunk = 1;
8103				r_mtu = mtu;
8104			}
8105		} else {
8106			r_mtu = mtu;
8107		}
8108		error = 0;
8109		/************************/
8110		/* ASCONF transmission */
8111		/************************/
8112		/* Now first lets go through the asconf queue */
8113		TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
8114			if (chk->rec.chunk_id.id != SCTP_ASCONF) {
8115				continue;
8116			}
8117			if (chk->whoTo == NULL) {
8118				if (asoc->alternate == NULL) {
8119					if (asoc->primary_destination != net) {
8120						break;
8121					}
8122				} else {
8123					if (asoc->alternate != net) {
8124						break;
8125					}
8126				}
8127			} else {
8128				if (chk->whoTo != net) {
8129					break;
8130				}
8131			}
8132			if (chk->data == NULL) {
8133				break;
8134			}
8135			if (chk->sent != SCTP_DATAGRAM_UNSENT &&
8136			    chk->sent != SCTP_DATAGRAM_RESEND) {
8137				break;
8138			}
8139			/*
8140			 * if no AUTH is yet included and this chunk
8141			 * requires it, make sure to account for it.  We
8142			 * don't apply the size until the AUTH chunk is
8143			 * actually added below in case there is no room for
8144			 * this chunk. NOTE: we overload the use of "omtu"
8145			 * here
8146			 */
8147			if ((auth == NULL) &&
8148			    sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8149			    stcb->asoc.peer_auth_chunks)) {
8150				omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8151			} else
8152				omtu = 0;
8153			/* Here we do NOT factor the r_mtu */
8154			if ((chk->send_size < (int)(mtu - omtu)) ||
8155			    (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8156				/*
8157				 * We probably should glom the mbuf chain
8158				 * from the chk->data for control but the
8159				 * problem is it becomes yet one more level
8160				 * of tracking to do if for some reason
8161				 * output fails. Then I have got to
8162				 * reconstruct the merged control chain.. el
8163				 * yucko.. for now we take the easy way and
8164				 * do the copy
8165				 */
8166				/*
8167				 * Add an AUTH chunk, if chunk requires it
8168				 * save the offset into the chain for AUTH
8169				 */
8170				if ((auth == NULL) &&
8171				    (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8172				    stcb->asoc.peer_auth_chunks))) {
8173					outchain = sctp_add_auth_chunk(outchain,
8174					    &endoutchain,
8175					    &auth,
8176					    &auth_offset,
8177					    stcb,
8178					    chk->rec.chunk_id.id);
8179					SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8180				}
8181				outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8182				    (int)chk->rec.chunk_id.can_take_data,
8183				    chk->send_size, chk->copy_by_ref);
8184				if (outchain == NULL) {
8185					*reason_code = 8;
8186					SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8187					return (ENOMEM);
8188				}
8189				SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8190				/* update our MTU size */
8191				if (mtu > (chk->send_size + omtu))
8192					mtu -= (chk->send_size + omtu);
8193				else
8194					mtu = 0;
8195				to_out += (chk->send_size + omtu);
8196				/* Do clear IP_DF ? */
8197				if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8198					no_fragmentflg = 0;
8199				}
8200				if (chk->rec.chunk_id.can_take_data)
8201					chk->data = NULL;
8202				/*
8203				 * set hb flag since we can use these for
8204				 * RTO
8205				 */
8206				hbflag = 1;
8207				asconf = 1;
8208				/*
8209				 * should sysctl this: don't bundle data
8210				 * with ASCONF since it requires AUTH
8211				 */
8212				no_data_chunks = 1;
8213				chk->sent = SCTP_DATAGRAM_SENT;
8214				if (chk->whoTo == NULL) {
8215					chk->whoTo = net;
8216					atomic_add_int(&net->ref_count, 1);
8217				}
8218				chk->snd_count++;
8219				if (mtu == 0) {
8220					/*
8221					 * Ok we are out of room but we can
8222					 * output without effecting the
8223					 * flight size since this little guy
8224					 * is a control only packet.
8225					 */
8226					sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8227					/*
8228					 * do NOT clear the asconf flag as
8229					 * it is used to do appropriate
8230					 * source address selection.
8231					 */
8232					if (*now_filled == 0) {
8233						(void)SCTP_GETTIME_TIMEVAL(now);
8234						*now_filled = 1;
8235					}
8236					net->last_sent_time = *now;
8237					hbflag = 0;
8238					if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8239					    (struct sockaddr *)&net->ro._l_addr,
8240					    outchain, auth_offset, auth,
8241					    stcb->asoc.authinfo.active_keyid,
8242					    no_fragmentflg, 0, asconf,
8243					    inp->sctp_lport, stcb->rport,
8244					    htonl(stcb->asoc.peer_vtag),
8245					    net->port, NULL,
8246					    0, 0,
8247					    so_locked))) {
8248						/*
8249						 * error, we could not
8250						 * output
8251						 */
8252						SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8253						if (from_where == 0) {
8254							SCTP_STAT_INCR(sctps_lowlevelerrusr);
8255						}
8256						if (error == ENOBUFS) {
8257							asoc->ifp_had_enobuf = 1;
8258							SCTP_STAT_INCR(sctps_lowlevelerr);
8259						}
8260						/* error, could not output */
8261						if (error == EHOSTUNREACH) {
8262							/*
8263							 * Destination went
8264							 * unreachable
8265							 * during this send
8266							 */
8267							sctp_move_chunks_from_net(stcb, net);
8268						}
8269						*reason_code = 7;
8270						break;
8271					} else {
8272						asoc->ifp_had_enobuf = 0;
8273					}
8274					/*
8275					 * increase the number we sent, if a
8276					 * cookie is sent we don't tell them
8277					 * any was sent out.
8278					 */
8279					outchain = endoutchain = NULL;
8280					auth = NULL;
8281					auth_offset = 0;
8282					if (!no_out_cnt)
8283						*num_out += ctl_cnt;
8284					/* recalc a clean slate and setup */
8285					switch (net->ro._l_addr.sa.sa_family) {
8286#ifdef INET
8287					case AF_INET:
8288						mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8289						break;
8290#endif
8291#ifdef INET6
8292					case AF_INET6:
8293						mtu = net->mtu - SCTP_MIN_OVERHEAD;
8294						break;
8295#endif
8296					default:
8297						/* TSNH */
8298						mtu = net->mtu;
8299						break;
8300					}
8301					to_out = 0;
8302					no_fragmentflg = 1;
8303				}
8304			}
8305		}
8306		if (error != 0) {
8307			/* try next net */
8308			continue;
8309		}
8310		/************************/
8311		/* Control transmission */
8312		/************************/
8313		/* Now first lets go through the control queue */
8314		TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
8315			if ((sack_goes_to) &&
8316			    (chk->rec.chunk_id.id == SCTP_ECN_ECHO) &&
8317			    (chk->whoTo != sack_goes_to)) {
8318				/*
8319				 * if we have a sack in queue, and we are
8320				 * looking at an ecn echo that is NOT queued
8321				 * to where the sack is going..
8322				 */
8323				if (chk->whoTo == net) {
8324					/*
8325					 * Don't transmit it to where its
8326					 * going (current net)
8327					 */
8328					continue;
8329				} else if (sack_goes_to == net) {
8330					/*
8331					 * But do transmit it to this
8332					 * address
8333					 */
8334					goto skip_net_check;
8335				}
8336			}
8337			if (chk->whoTo == NULL) {
8338				if (asoc->alternate == NULL) {
8339					if (asoc->primary_destination != net) {
8340						continue;
8341					}
8342				} else {
8343					if (asoc->alternate != net) {
8344						continue;
8345					}
8346				}
8347			} else {
8348				if (chk->whoTo != net) {
8349					continue;
8350				}
8351			}
8352	skip_net_check:
8353			if (chk->data == NULL) {
8354				continue;
8355			}
8356			if (chk->sent != SCTP_DATAGRAM_UNSENT) {
8357				/*
8358				 * It must be unsent. Cookies and ASCONF's
8359				 * hang around but there timers will force
8360				 * when marked for resend.
8361				 */
8362				continue;
8363			}
8364			/*
8365			 * if no AUTH is yet included and this chunk
8366			 * requires it, make sure to account for it.  We
8367			 * don't apply the size until the AUTH chunk is
8368			 * actually added below in case there is no room for
8369			 * this chunk. NOTE: we overload the use of "omtu"
8370			 * here
8371			 */
8372			if ((auth == NULL) &&
8373			    sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8374			    stcb->asoc.peer_auth_chunks)) {
8375				omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8376			} else
8377				omtu = 0;
8378			/* Here we do NOT factor the r_mtu */
8379			if ((chk->send_size <= (int)(mtu - omtu)) ||
8380			    (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8381				/*
8382				 * We probably should glom the mbuf chain
8383				 * from the chk->data for control but the
8384				 * problem is it becomes yet one more level
8385				 * of tracking to do if for some reason
8386				 * output fails. Then I have got to
8387				 * reconstruct the merged control chain.. el
8388				 * yucko.. for now we take the easy way and
8389				 * do the copy
8390				 */
8391				/*
8392				 * Add an AUTH chunk, if chunk requires it
8393				 * save the offset into the chain for AUTH
8394				 */
8395				if ((auth == NULL) &&
8396				    (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8397				    stcb->asoc.peer_auth_chunks))) {
8398					outchain = sctp_add_auth_chunk(outchain,
8399					    &endoutchain,
8400					    &auth,
8401					    &auth_offset,
8402					    stcb,
8403					    chk->rec.chunk_id.id);
8404					SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8405				}
8406				outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8407				    (int)chk->rec.chunk_id.can_take_data,
8408				    chk->send_size, chk->copy_by_ref);
8409				if (outchain == NULL) {
8410					*reason_code = 8;
8411					SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8412					return (ENOMEM);
8413				}
8414				SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8415				/* update our MTU size */
8416				if (mtu > (chk->send_size + omtu))
8417					mtu -= (chk->send_size + omtu);
8418				else
8419					mtu = 0;
8420				to_out += (chk->send_size + omtu);
8421				/* Do clear IP_DF ? */
8422				if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8423					no_fragmentflg = 0;
8424				}
8425				if (chk->rec.chunk_id.can_take_data)
8426					chk->data = NULL;
8427				/* Mark things to be removed, if needed */
8428				if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8429				    (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||	/* EY */
8430				    (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
8431				    (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
8432				    (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
8433				    (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
8434				    (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
8435				    (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
8436				    (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
8437				    (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
8438				    (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
8439					if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
8440						hbflag = 1;
8441					}
8442					/* remove these chunks at the end */
8443					if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8444					    (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
8445						/* turn off the timer */
8446						if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
8447							sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
8448							    inp, stcb, net,
8449							    SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
8450						}
8451					}
8452					ctl_cnt++;
8453				} else {
8454					/*
8455					 * Other chunks, since they have
8456					 * timers running (i.e. COOKIE) we
8457					 * just "trust" that it gets sent or
8458					 * retransmitted.
8459					 */
8460					ctl_cnt++;
8461					if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
8462						cookie = 1;
8463						no_out_cnt = 1;
8464					} else if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
8465						/*
8466						 * Increment ecne send count
8467						 * here this means we may be
8468						 * over-zealous in our
8469						 * counting if the send
8470						 * fails, but its the best
8471						 * place to do it (we used
8472						 * to do it in the queue of
8473						 * the chunk, but that did
8474						 * not tell how many times
8475						 * it was sent.
8476						 */
8477						SCTP_STAT_INCR(sctps_sendecne);
8478					}
8479					chk->sent = SCTP_DATAGRAM_SENT;
8480					if (chk->whoTo == NULL) {
8481						chk->whoTo = net;
8482						atomic_add_int(&net->ref_count, 1);
8483					}
8484					chk->snd_count++;
8485				}
8486				if (mtu == 0) {
8487					/*
8488					 * Ok we are out of room but we can
8489					 * output without effecting the
8490					 * flight size since this little guy
8491					 * is a control only packet.
8492					 */
8493					if (asconf) {
8494						sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8495						/*
8496						 * do NOT clear the asconf
8497						 * flag as it is used to do
8498						 * appropriate source
8499						 * address selection.
8500						 */
8501					}
8502					if (cookie) {
8503						sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8504						cookie = 0;
8505					}
8506					/* Only HB or ASCONF advances time */
8507					if (hbflag) {
8508						if (*now_filled == 0) {
8509							(void)SCTP_GETTIME_TIMEVAL(now);
8510							*now_filled = 1;
8511						}
8512						net->last_sent_time = *now;
8513						hbflag = 0;
8514					}
8515					if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8516					    (struct sockaddr *)&net->ro._l_addr,
8517					    outchain,
8518					    auth_offset, auth,
8519					    stcb->asoc.authinfo.active_keyid,
8520					    no_fragmentflg, 0, asconf,
8521					    inp->sctp_lport, stcb->rport,
8522					    htonl(stcb->asoc.peer_vtag),
8523					    net->port, NULL,
8524					    0, 0,
8525					    so_locked))) {
8526						/*
8527						 * error, we could not
8528						 * output
8529						 */
8530						SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8531						if (from_where == 0) {
8532							SCTP_STAT_INCR(sctps_lowlevelerrusr);
8533						}
8534						if (error == ENOBUFS) {
8535							asoc->ifp_had_enobuf = 1;
8536							SCTP_STAT_INCR(sctps_lowlevelerr);
8537						}
8538						if (error == EHOSTUNREACH) {
8539							/*
8540							 * Destination went
8541							 * unreachable
8542							 * during this send
8543							 */
8544							sctp_move_chunks_from_net(stcb, net);
8545						}
8546						*reason_code = 7;
8547						break;
8548					} else {
8549						asoc->ifp_had_enobuf = 0;
8550					}
8551					/*
8552					 * increase the number we sent, if a
8553					 * cookie is sent we don't tell them
8554					 * any was sent out.
8555					 */
8556					outchain = endoutchain = NULL;
8557					auth = NULL;
8558					auth_offset = 0;
8559					if (!no_out_cnt)
8560						*num_out += ctl_cnt;
8561					/* recalc a clean slate and setup */
8562					switch (net->ro._l_addr.sa.sa_family) {
8563#ifdef INET
8564					case AF_INET:
8565						mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8566						break;
8567#endif
8568#ifdef INET6
8569					case AF_INET6:
8570						mtu = net->mtu - SCTP_MIN_OVERHEAD;
8571						break;
8572#endif
8573					default:
8574						/* TSNH */
8575						mtu = net->mtu;
8576						break;
8577					}
8578					to_out = 0;
8579					no_fragmentflg = 1;
8580				}
8581			}
8582		}
8583		if (error != 0) {
8584			/* try next net */
8585			continue;
8586		}
8587		/* JRI: if dest is in PF state, do not send data to it */
8588		if ((asoc->sctp_cmt_on_off > 0) &&
8589		    (net != stcb->asoc.alternate) &&
8590		    (net->dest_state & SCTP_ADDR_PF)) {
8591			goto no_data_fill;
8592		}
8593		if (net->flight_size >= net->cwnd) {
8594			goto no_data_fill;
8595		}
8596		if ((asoc->sctp_cmt_on_off > 0) &&
8597		    (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_RECV_BUFFER_SPLITTING) &&
8598		    (net->flight_size > max_rwnd_per_dest)) {
8599			goto no_data_fill;
8600		}
8601		/*
8602		 * We need a specific accounting for the usage of the send
8603		 * buffer. We also need to check the number of messages per
8604		 * net. For now, this is better than nothing and it disabled
8605		 * by default...
8606		 */
8607		if ((asoc->sctp_cmt_on_off > 0) &&
8608		    (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_SEND_BUFFER_SPLITTING) &&
8609		    (max_send_per_dest > 0) &&
8610		    (net->flight_size > max_send_per_dest)) {
8611			goto no_data_fill;
8612		}
8613		/*********************/
8614		/* Data transmission */
8615		/*********************/
8616		/*
8617		 * if AUTH for DATA is required and no AUTH has been added
8618		 * yet, account for this in the mtu now... if no data can be
8619		 * bundled, this adjustment won't matter anyways since the
8620		 * packet will be going out...
8621		 */
8622		data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
8623		    stcb->asoc.peer_auth_chunks);
8624		if (data_auth_reqd && (auth == NULL)) {
8625			mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8626		}
8627		/* now lets add any data within the MTU constraints */
8628		switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8629#ifdef INET
8630		case AF_INET:
8631			if (net->mtu > SCTP_MIN_V4_OVERHEAD)
8632				omtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8633			else
8634				omtu = 0;
8635			break;
8636#endif
8637#ifdef INET6
8638		case AF_INET6:
8639			if (net->mtu > SCTP_MIN_OVERHEAD)
8640				omtu = net->mtu - SCTP_MIN_OVERHEAD;
8641			else
8642				omtu = 0;
8643			break;
8644#endif
8645		default:
8646			/* TSNH */
8647			omtu = 0;
8648			break;
8649		}
8650		if ((((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) ||
8651		    (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) &&
8652		    (skip_data_for_this_net == 0)) ||
8653		    (cookie)) {
8654			TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
8655				if (no_data_chunks) {
8656					/* let only control go out */
8657					*reason_code = 1;
8658					break;
8659				}
8660				if (net->flight_size >= net->cwnd) {
8661					/* skip this net, no room for data */
8662					*reason_code = 2;
8663					break;
8664				}
8665				if ((chk->whoTo != NULL) &&
8666				    (chk->whoTo != net)) {
8667					/* Don't send the chunk on this net */
8668					continue;
8669				}
8670
8671				if (asoc->sctp_cmt_on_off == 0) {
8672					if ((asoc->alternate) &&
8673					    (asoc->alternate != net) &&
8674					    (chk->whoTo == NULL)) {
8675						continue;
8676					} else if ((net != asoc->primary_destination) &&
8677						    (asoc->alternate == NULL) &&
8678					    (chk->whoTo == NULL)) {
8679						continue;
8680					}
8681				}
8682				if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
8683					/*-
8684					 * strange, we have a chunk that is
8685					 * to big for its destination and
8686					 * yet no fragment ok flag.
8687					 * Something went wrong when the
8688					 * PMTU changed...we did not mark
8689					 * this chunk for some reason?? I
8690					 * will fix it here by letting IP
8691					 * fragment it for now and printing
8692					 * a warning. This really should not
8693					 * happen ...
8694					 */
8695					SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
8696					    chk->send_size, mtu);
8697					chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
8698				}
8699				if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
8700				    (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
8701					struct sctp_data_chunk *dchkh;
8702
8703					dchkh = mtod(chk->data, struct sctp_data_chunk *);
8704					dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
8705				}
8706				if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
8707				    ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
8708					/* ok we will add this one */
8709
8710					/*
8711					 * Add an AUTH chunk, if chunk
8712					 * requires it, save the offset into
8713					 * the chain for AUTH
8714					 */
8715					if (data_auth_reqd) {
8716						if (auth == NULL) {
8717							outchain = sctp_add_auth_chunk(outchain,
8718							    &endoutchain,
8719							    &auth,
8720							    &auth_offset,
8721							    stcb,
8722							    SCTP_DATA);
8723							auth_keyid = chk->auth_keyid;
8724							override_ok = 0;
8725							SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8726						} else if (override_ok) {
8727							/*
8728							 * use this data's
8729							 * keyid
8730							 */
8731							auth_keyid = chk->auth_keyid;
8732							override_ok = 0;
8733						} else if (auth_keyid != chk->auth_keyid) {
8734							/*
8735							 * different keyid,
8736							 * so done bundling
8737							 */
8738							break;
8739						}
8740					}
8741					outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
8742					    chk->send_size, chk->copy_by_ref);
8743					if (outchain == NULL) {
8744						SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
8745						if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8746							sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8747						}
8748						*reason_code = 3;
8749						SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8750						return (ENOMEM);
8751					}
8752					/* upate our MTU size */
8753					/* Do clear IP_DF ? */
8754					if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8755						no_fragmentflg = 0;
8756					}
8757					/* unsigned subtraction of mtu */
8758					if (mtu > chk->send_size)
8759						mtu -= chk->send_size;
8760					else
8761						mtu = 0;
8762					/* unsigned subtraction of r_mtu */
8763					if (r_mtu > chk->send_size)
8764						r_mtu -= chk->send_size;
8765					else
8766						r_mtu = 0;
8767
8768					to_out += chk->send_size;
8769					if ((to_out > mx_mtu) && no_fragmentflg) {
8770#ifdef INVARIANTS
8771						panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
8772#else
8773						SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
8774						    mx_mtu, to_out);
8775#endif
8776					}
8777					chk->window_probe = 0;
8778					data_list[bundle_at++] = chk;
8779					if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8780						break;
8781					}
8782					if (chk->sent == SCTP_DATAGRAM_UNSENT) {
8783						if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
8784							SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
8785						} else {
8786							SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
8787						}
8788						if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
8789						    ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
8790							/*
8791							 * Count number of
8792							 * user msg's that
8793							 * were fragmented
8794							 * we do this by
8795							 * counting when we
8796							 * see a LAST
8797							 * fragment only.
8798							 */
8799							SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
8800					}
8801					if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
8802						if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
8803							data_list[0]->window_probe = 1;
8804							net->window_probe = 1;
8805						}
8806						break;
8807					}
8808				} else {
8809					/*
8810					 * Must be sent in order of the
8811					 * TSN's (on a network)
8812					 */
8813					break;
8814				}
8815			}	/* for (chunk gather loop for this net) */
8816		}		/* if asoc.state OPEN */
8817no_data_fill:
8818		/* Is there something to send for this destination? */
8819		if (outchain) {
8820			/* We may need to start a control timer or two */
8821			if (asconf) {
8822				sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
8823				    stcb, net);
8824				/*
8825				 * do NOT clear the asconf flag as it is
8826				 * used to do appropriate source address
8827				 * selection.
8828				 */
8829			}
8830			if (cookie) {
8831				sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8832				cookie = 0;
8833			}
8834			/* must start a send timer if data is being sent */
8835			if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8836				/*
8837				 * no timer running on this destination
8838				 * restart it.
8839				 */
8840				sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8841			}
8842			if (bundle_at || hbflag) {
8843				/* For data/asconf and hb set time */
8844				if (*now_filled == 0) {
8845					(void)SCTP_GETTIME_TIMEVAL(now);
8846					*now_filled = 1;
8847				}
8848				net->last_sent_time = *now;
8849			}
8850			/* Now send it, if there is anything to send :> */
8851			if ((error = sctp_lowlevel_chunk_output(inp,
8852			    stcb,
8853			    net,
8854			    (struct sockaddr *)&net->ro._l_addr,
8855			    outchain,
8856			    auth_offset,
8857			    auth,
8858			    auth_keyid,
8859			    no_fragmentflg,
8860			    bundle_at,
8861			    asconf,
8862			    inp->sctp_lport, stcb->rport,
8863			    htonl(stcb->asoc.peer_vtag),
8864			    net->port, NULL,
8865			    0, 0,
8866			    so_locked))) {
8867				/* error, we could not output */
8868				SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8869				if (from_where == 0) {
8870					SCTP_STAT_INCR(sctps_lowlevelerrusr);
8871				}
8872				if (error == ENOBUFS) {
8873					asoc->ifp_had_enobuf = 1;
8874					SCTP_STAT_INCR(sctps_lowlevelerr);
8875				}
8876				if (error == EHOSTUNREACH) {
8877					/*
8878					 * Destination went unreachable
8879					 * during this send
8880					 */
8881					sctp_move_chunks_from_net(stcb, net);
8882				}
8883				*reason_code = 6;
8884				/*-
8885				 * I add this line to be paranoid. As far as
8886				 * I can tell the continue, takes us back to
8887				 * the top of the for, but just to make sure
8888				 * I will reset these again here.
8889				 */
8890				ctl_cnt = bundle_at = 0;
8891				continue;	/* This takes us back to the
8892						 * for() for the nets. */
8893			} else {
8894				asoc->ifp_had_enobuf = 0;
8895			}
8896			endoutchain = NULL;
8897			auth = NULL;
8898			auth_offset = 0;
8899			if (!no_out_cnt) {
8900				*num_out += (ctl_cnt + bundle_at);
8901			}
8902			if (bundle_at) {
8903				/* setup for a RTO measurement */
8904				tsns_sent = data_list[0]->rec.data.tsn;
8905				/* fill time if not already filled */
8906				if (*now_filled == 0) {
8907					(void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8908					*now_filled = 1;
8909					*now = asoc->time_last_sent;
8910				} else {
8911					asoc->time_last_sent = *now;
8912				}
8913				if (net->rto_needed) {
8914					data_list[0]->do_rtt = 1;
8915					net->rto_needed = 0;
8916				}
8917				SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
8918				sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
8919			}
8920			if (one_chunk) {
8921				break;
8922			}
8923		}
8924		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8925			sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
8926		}
8927	}
8928	if (old_start_at == NULL) {
8929		old_start_at = start_at;
8930		start_at = TAILQ_FIRST(&asoc->nets);
8931		if (old_start_at)
8932			goto again_one_more_time;
8933	}
8934
8935	/*
8936	 * At the end there should be no NON timed chunks hanging on this
8937	 * queue.
8938	 */
8939	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8940		sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
8941	}
8942	if ((*num_out == 0) && (*reason_code == 0)) {
8943		*reason_code = 4;
8944	} else {
8945		*reason_code = 5;
8946	}
8947	sctp_clean_up_ctl(stcb, asoc, so_locked);
8948	return (0);
8949}
8950
8951void
8952sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
8953{
8954	/*-
8955	 * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
8956	 * the control chunk queue.
8957	 */
8958	struct sctp_chunkhdr *hdr;
8959	struct sctp_tmit_chunk *chk;
8960	struct mbuf *mat, *last_mbuf;
8961	uint32_t chunk_length;
8962	uint16_t padding_length;
8963
8964	SCTP_TCB_LOCK_ASSERT(stcb);
8965	SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_NOWAIT);
8966	if (op_err == NULL) {
8967		return;
8968	}
8969	last_mbuf = NULL;
8970	chunk_length = 0;
8971	for (mat = op_err; mat != NULL; mat = SCTP_BUF_NEXT(mat)) {
8972		chunk_length += SCTP_BUF_LEN(mat);
8973		if (SCTP_BUF_NEXT(mat) == NULL) {
8974			last_mbuf = mat;
8975		}
8976	}
8977	if (chunk_length > SCTP_MAX_CHUNK_LENGTH) {
8978		sctp_m_freem(op_err);
8979		return;
8980	}
8981	padding_length = chunk_length % 4;
8982	if (padding_length != 0) {
8983		padding_length = 4 - padding_length;
8984	}
8985	if (padding_length != 0) {
8986		if (sctp_add_pad_tombuf(last_mbuf, padding_length) == NULL) {
8987			sctp_m_freem(op_err);
8988			return;
8989		}
8990	}
8991	sctp_alloc_a_chunk(stcb, chk);
8992	if (chk == NULL) {
8993		/* no memory */
8994		sctp_m_freem(op_err);
8995		return;
8996	}
8997	chk->copy_by_ref = 0;
8998	chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
8999	chk->rec.chunk_id.can_take_data = 0;
9000	chk->flags = 0;
9001	chk->send_size = (uint16_t)chunk_length;
9002	chk->sent = SCTP_DATAGRAM_UNSENT;
9003	chk->snd_count = 0;
9004	chk->asoc = &stcb->asoc;
9005	chk->data = op_err;
9006	chk->whoTo = NULL;
9007	hdr = mtod(op_err, struct sctp_chunkhdr *);
9008	hdr->chunk_type = SCTP_OPERATION_ERROR;
9009	hdr->chunk_flags = 0;
9010	hdr->chunk_length = htons(chk->send_size);
9011	TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9012	chk->asoc->ctrl_queue_cnt++;
9013}
9014
9015int
9016sctp_send_cookie_echo(struct mbuf *m,
9017    int offset, int limit,
9018    struct sctp_tcb *stcb,
9019    struct sctp_nets *net)
9020{
9021	/*-
9022	 * pull out the cookie and put it at the front of the control chunk
9023	 * queue.
9024	 */
9025	int at;
9026	struct mbuf *cookie;
9027	struct sctp_paramhdr param, *phdr;
9028	struct sctp_chunkhdr *hdr;
9029	struct sctp_tmit_chunk *chk;
9030	uint16_t ptype, plen;
9031
9032	SCTP_TCB_LOCK_ASSERT(stcb);
9033	/* First find the cookie in the param area */
9034	cookie = NULL;
9035	at = offset + sizeof(struct sctp_init_chunk);
9036	for (;;) {
9037		phdr = sctp_get_next_param(m, at, &param, sizeof(param));
9038		if (phdr == NULL) {
9039			return (-3);
9040		}
9041		ptype = ntohs(phdr->param_type);
9042		plen = ntohs(phdr->param_length);
9043		if (plen < sizeof(struct sctp_paramhdr)) {
9044			return (-6);
9045		}
9046		if (ptype == SCTP_STATE_COOKIE) {
9047			int pad;
9048
9049			/* found the cookie */
9050			if (at + plen > limit) {
9051				return (-7);
9052			}
9053			cookie = SCTP_M_COPYM(m, at, plen, M_NOWAIT);
9054			if (cookie == NULL) {
9055				/* No memory */
9056				return (-2);
9057			}
9058			if ((pad = (plen % 4)) > 0) {
9059				pad = 4 - pad;
9060			}
9061			if (pad > 0) {
9062				if (sctp_pad_lastmbuf(cookie, pad, NULL) == NULL) {
9063					return (-8);
9064				}
9065			}
9066#ifdef SCTP_MBUF_LOGGING
9067			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9068				sctp_log_mbc(cookie, SCTP_MBUF_ICOPY);
9069			}
9070#endif
9071			break;
9072		}
9073		at += SCTP_SIZE32(plen);
9074	}
9075	/* ok, we got the cookie lets change it into a cookie echo chunk */
9076	/* first the change from param to cookie */
9077	hdr = mtod(cookie, struct sctp_chunkhdr *);
9078	hdr->chunk_type = SCTP_COOKIE_ECHO;
9079	hdr->chunk_flags = 0;
9080	/* get the chunk stuff now and place it in the FRONT of the queue */
9081	sctp_alloc_a_chunk(stcb, chk);
9082	if (chk == NULL) {
9083		/* no memory */
9084		sctp_m_freem(cookie);
9085		return (-5);
9086	}
9087	chk->copy_by_ref = 0;
9088	chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
9089	chk->rec.chunk_id.can_take_data = 0;
9090	chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9091	chk->send_size = SCTP_SIZE32(plen);
9092	chk->sent = SCTP_DATAGRAM_UNSENT;
9093	chk->snd_count = 0;
9094	chk->asoc = &stcb->asoc;
9095	chk->data = cookie;
9096	chk->whoTo = net;
9097	atomic_add_int(&chk->whoTo->ref_count, 1);
9098	TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
9099	chk->asoc->ctrl_queue_cnt++;
9100	return (0);
9101}
9102
9103void
9104sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
9105    struct mbuf *m,
9106    int offset,
9107    int chk_length,
9108    struct sctp_nets *net)
9109{
9110	/*
9111	 * take a HB request and make it into a HB ack and send it.
9112	 */
9113	struct mbuf *outchain;
9114	struct sctp_chunkhdr *chdr;
9115	struct sctp_tmit_chunk *chk;
9116
9117	if (net == NULL)
9118		/* must have a net pointer */
9119		return;
9120
9121	outchain = SCTP_M_COPYM(m, offset, chk_length, M_NOWAIT);
9122	if (outchain == NULL) {
9123		/* gak out of memory */
9124		return;
9125	}
9126#ifdef SCTP_MBUF_LOGGING
9127	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9128		sctp_log_mbc(outchain, SCTP_MBUF_ICOPY);
9129	}
9130#endif
9131	chdr = mtod(outchain, struct sctp_chunkhdr *);
9132	chdr->chunk_type = SCTP_HEARTBEAT_ACK;
9133	chdr->chunk_flags = 0;
9134	if (chk_length % 4 != 0) {
9135		sctp_pad_lastmbuf(outchain, 4 - (chk_length % 4), NULL);
9136	}
9137	sctp_alloc_a_chunk(stcb, chk);
9138	if (chk == NULL) {
9139		/* no memory */
9140		sctp_m_freem(outchain);
9141		return;
9142	}
9143	chk->copy_by_ref = 0;
9144	chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
9145	chk->rec.chunk_id.can_take_data = 1;
9146	chk->flags = 0;
9147	chk->send_size = chk_length;
9148	chk->sent = SCTP_DATAGRAM_UNSENT;
9149	chk->snd_count = 0;
9150	chk->asoc = &stcb->asoc;
9151	chk->data = outchain;
9152	chk->whoTo = net;
9153	atomic_add_int(&chk->whoTo->ref_count, 1);
9154	TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9155	chk->asoc->ctrl_queue_cnt++;
9156}
9157
9158void
9159sctp_send_cookie_ack(struct sctp_tcb *stcb)
9160{
9161	/* formulate and queue a cookie-ack back to sender */
9162	struct mbuf *cookie_ack;
9163	struct sctp_chunkhdr *hdr;
9164	struct sctp_tmit_chunk *chk;
9165
9166	SCTP_TCB_LOCK_ASSERT(stcb);
9167
9168	cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
9169	if (cookie_ack == NULL) {
9170		/* no mbuf's */
9171		return;
9172	}
9173	SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
9174	sctp_alloc_a_chunk(stcb, chk);
9175	if (chk == NULL) {
9176		/* no memory */
9177		sctp_m_freem(cookie_ack);
9178		return;
9179	}
9180	chk->copy_by_ref = 0;
9181	chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
9182	chk->rec.chunk_id.can_take_data = 1;
9183	chk->flags = 0;
9184	chk->send_size = sizeof(struct sctp_chunkhdr);
9185	chk->sent = SCTP_DATAGRAM_UNSENT;
9186	chk->snd_count = 0;
9187	chk->asoc = &stcb->asoc;
9188	chk->data = cookie_ack;
9189	if (chk->asoc->last_control_chunk_from != NULL) {
9190		chk->whoTo = chk->asoc->last_control_chunk_from;
9191		atomic_add_int(&chk->whoTo->ref_count, 1);
9192	} else {
9193		chk->whoTo = NULL;
9194	}
9195	hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
9196	hdr->chunk_type = SCTP_COOKIE_ACK;
9197	hdr->chunk_flags = 0;
9198	hdr->chunk_length = htons(chk->send_size);
9199	SCTP_BUF_LEN(cookie_ack) = chk->send_size;
9200	TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9201	chk->asoc->ctrl_queue_cnt++;
9202	return;
9203}
9204
9205
9206void
9207sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
9208{
9209	/* formulate and queue a SHUTDOWN-ACK back to the sender */
9210	struct mbuf *m_shutdown_ack;
9211	struct sctp_shutdown_ack_chunk *ack_cp;
9212	struct sctp_tmit_chunk *chk;
9213
9214	m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9215	if (m_shutdown_ack == NULL) {
9216		/* no mbuf's */
9217		return;
9218	}
9219	SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
9220	sctp_alloc_a_chunk(stcb, chk);
9221	if (chk == NULL) {
9222		/* no memory */
9223		sctp_m_freem(m_shutdown_ack);
9224		return;
9225	}
9226	chk->copy_by_ref = 0;
9227	chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
9228	chk->rec.chunk_id.can_take_data = 1;
9229	chk->flags = 0;
9230	chk->send_size = sizeof(struct sctp_chunkhdr);
9231	chk->sent = SCTP_DATAGRAM_UNSENT;
9232	chk->snd_count = 0;
9233	chk->asoc = &stcb->asoc;
9234	chk->data = m_shutdown_ack;
9235	chk->whoTo = net;
9236	if (chk->whoTo) {
9237		atomic_add_int(&chk->whoTo->ref_count, 1);
9238	}
9239	ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
9240	ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
9241	ack_cp->ch.chunk_flags = 0;
9242	ack_cp->ch.chunk_length = htons(chk->send_size);
9243	SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
9244	TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9245	chk->asoc->ctrl_queue_cnt++;
9246	return;
9247}
9248
9249void
9250sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
9251{
9252	/* formulate and queue a SHUTDOWN to the sender */
9253	struct mbuf *m_shutdown;
9254	struct sctp_shutdown_chunk *shutdown_cp;
9255	struct sctp_tmit_chunk *chk;
9256
9257	TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
9258		if (chk->rec.chunk_id.id == SCTP_SHUTDOWN) {
9259			/* We already have a SHUTDOWN queued. Reuse it. */
9260			if (chk->whoTo) {
9261				sctp_free_remote_addr(chk->whoTo);
9262				chk->whoTo = NULL;
9263			}
9264			break;
9265		}
9266	}
9267	if (chk == NULL) {
9268		m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9269		if (m_shutdown == NULL) {
9270			/* no mbuf's */
9271			return;
9272		}
9273		SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
9274		sctp_alloc_a_chunk(stcb, chk);
9275		if (chk == NULL) {
9276			/* no memory */
9277			sctp_m_freem(m_shutdown);
9278			return;
9279		}
9280		chk->copy_by_ref = 0;
9281		chk->rec.chunk_id.id = SCTP_SHUTDOWN;
9282		chk->rec.chunk_id.can_take_data = 1;
9283		chk->flags = 0;
9284		chk->send_size = sizeof(struct sctp_shutdown_chunk);
9285		chk->sent = SCTP_DATAGRAM_UNSENT;
9286		chk->snd_count = 0;
9287		chk->asoc = &stcb->asoc;
9288		chk->data = m_shutdown;
9289		chk->whoTo = net;
9290		if (chk->whoTo) {
9291			atomic_add_int(&chk->whoTo->ref_count, 1);
9292		}
9293		shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
9294		shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
9295		shutdown_cp->ch.chunk_flags = 0;
9296		shutdown_cp->ch.chunk_length = htons(chk->send_size);
9297		shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9298		SCTP_BUF_LEN(m_shutdown) = chk->send_size;
9299		TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9300		chk->asoc->ctrl_queue_cnt++;
9301	} else {
9302		TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, sctp_next);
9303		chk->whoTo = net;
9304		if (chk->whoTo) {
9305			atomic_add_int(&chk->whoTo->ref_count, 1);
9306		}
9307		shutdown_cp = mtod(chk->data, struct sctp_shutdown_chunk *);
9308		shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9309		TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
9310	}
9311	return;
9312}
9313
9314void
9315sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
9316{
9317	/*
9318	 * formulate and queue an ASCONF to the peer. ASCONF parameters
9319	 * should be queued on the assoc queue.
9320	 */
9321	struct sctp_tmit_chunk *chk;
9322	struct mbuf *m_asconf;
9323	int len;
9324
9325	SCTP_TCB_LOCK_ASSERT(stcb);
9326
9327	if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
9328	    (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
9329		/* can't send a new one if there is one in flight already */
9330		return;
9331	}
9332
9333	/* compose an ASCONF chunk, maximum length is PMTU */
9334	m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
9335	if (m_asconf == NULL) {
9336		return;
9337	}
9338
9339	sctp_alloc_a_chunk(stcb, chk);
9340	if (chk == NULL) {
9341		/* no memory */
9342		sctp_m_freem(m_asconf);
9343		return;
9344	}
9345
9346	chk->copy_by_ref = 0;
9347	chk->rec.chunk_id.id = SCTP_ASCONF;
9348	chk->rec.chunk_id.can_take_data = 0;
9349	chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9350	chk->data = m_asconf;
9351	chk->send_size = len;
9352	chk->sent = SCTP_DATAGRAM_UNSENT;
9353	chk->snd_count = 0;
9354	chk->asoc = &stcb->asoc;
9355	chk->whoTo = net;
9356	if (chk->whoTo) {
9357		atomic_add_int(&chk->whoTo->ref_count, 1);
9358	}
9359	TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
9360	chk->asoc->ctrl_queue_cnt++;
9361	return;
9362}
9363
9364void
9365sctp_send_asconf_ack(struct sctp_tcb *stcb)
9366{
9367	/*
9368	 * formulate and queue a asconf-ack back to sender. the asconf-ack
9369	 * must be stored in the tcb.
9370	 */
9371	struct sctp_tmit_chunk *chk;
9372	struct sctp_asconf_ack *ack, *latest_ack;
9373	struct mbuf *m_ack;
9374	struct sctp_nets *net = NULL;
9375
9376	SCTP_TCB_LOCK_ASSERT(stcb);
9377	/* Get the latest ASCONF-ACK */
9378	latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
9379	if (latest_ack == NULL) {
9380		return;
9381	}
9382	if (latest_ack->last_sent_to != NULL &&
9383	    latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
9384		/* we're doing a retransmission */
9385		net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
9386		if (net == NULL) {
9387			/* no alternate */
9388			if (stcb->asoc.last_control_chunk_from == NULL) {
9389				if (stcb->asoc.alternate) {
9390					net = stcb->asoc.alternate;
9391				} else {
9392					net = stcb->asoc.primary_destination;
9393				}
9394			} else {
9395				net = stcb->asoc.last_control_chunk_from;
9396			}
9397		}
9398	} else {
9399		/* normal case */
9400		if (stcb->asoc.last_control_chunk_from == NULL) {
9401			if (stcb->asoc.alternate) {
9402				net = stcb->asoc.alternate;
9403			} else {
9404				net = stcb->asoc.primary_destination;
9405			}
9406		} else {
9407			net = stcb->asoc.last_control_chunk_from;
9408		}
9409	}
9410	latest_ack->last_sent_to = net;
9411
9412	TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
9413		if (ack->data == NULL) {
9414			continue;
9415		}
9416
9417		/* copy the asconf_ack */
9418		m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_NOWAIT);
9419		if (m_ack == NULL) {
9420			/* couldn't copy it */
9421			return;
9422		}
9423#ifdef SCTP_MBUF_LOGGING
9424		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9425			sctp_log_mbc(m_ack, SCTP_MBUF_ICOPY);
9426		}
9427#endif
9428
9429		sctp_alloc_a_chunk(stcb, chk);
9430		if (chk == NULL) {
9431			/* no memory */
9432			if (m_ack)
9433				sctp_m_freem(m_ack);
9434			return;
9435		}
9436		chk->copy_by_ref = 0;
9437		chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
9438		chk->rec.chunk_id.can_take_data = 1;
9439		chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9440		chk->whoTo = net;
9441		if (chk->whoTo) {
9442			atomic_add_int(&chk->whoTo->ref_count, 1);
9443		}
9444		chk->data = m_ack;
9445		chk->send_size = ack->len;
9446		chk->sent = SCTP_DATAGRAM_UNSENT;
9447		chk->snd_count = 0;
9448		chk->asoc = &stcb->asoc;
9449
9450		TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9451		chk->asoc->ctrl_queue_cnt++;
9452	}
9453	return;
9454}
9455
9456
9457static int
9458sctp_chunk_retransmission(struct sctp_inpcb *inp,
9459    struct sctp_tcb *stcb,
9460    struct sctp_association *asoc,
9461    int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked
9462#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9463    SCTP_UNUSED
9464#endif
9465)
9466{
9467	/*-
9468	 * send out one MTU of retransmission. If fast_retransmit is
9469	 * happening we ignore the cwnd. Otherwise we obey the cwnd and
9470	 * rwnd. For a Cookie or Asconf in the control chunk queue we
9471	 * retransmit them by themselves.
9472	 *
9473	 * For data chunks we will pick out the lowest TSN's in the sent_queue
9474	 * marked for resend and bundle them all together (up to a MTU of
9475	 * destination). The address to send to should have been
9476	 * selected/changed where the retransmission was marked (i.e. in FR
9477	 * or t3-timeout routines).
9478	 */
9479	struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
9480	struct sctp_tmit_chunk *chk, *fwd;
9481	struct mbuf *m, *endofchain;
9482	struct sctp_nets *net = NULL;
9483	uint32_t tsns_sent = 0;
9484	int no_fragmentflg, bundle_at, cnt_thru;
9485	unsigned int mtu;
9486	int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
9487	struct sctp_auth_chunk *auth = NULL;
9488	uint32_t auth_offset = 0;
9489	uint16_t auth_keyid;
9490	int override_ok = 1;
9491	int data_auth_reqd = 0;
9492	uint32_t dmtu = 0;
9493
9494	SCTP_TCB_LOCK_ASSERT(stcb);
9495	tmr_started = ctl_cnt = bundle_at = error = 0;
9496	no_fragmentflg = 1;
9497	fwd_tsn = 0;
9498	*cnt_out = 0;
9499	fwd = NULL;
9500	endofchain = m = NULL;
9501	auth_keyid = stcb->asoc.authinfo.active_keyid;
9502#ifdef SCTP_AUDITING_ENABLED
9503	sctp_audit_log(0xC3, 1);
9504#endif
9505	if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
9506	    (TAILQ_EMPTY(&asoc->control_send_queue))) {
9507		SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
9508		    asoc->sent_queue_retran_cnt);
9509		asoc->sent_queue_cnt = 0;
9510		asoc->sent_queue_cnt_removeable = 0;
9511		/* send back 0/0 so we enter normal transmission */
9512		*cnt_out = 0;
9513		return (0);
9514	}
9515	TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9516		if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
9517		    (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
9518		    (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
9519			if (chk->sent != SCTP_DATAGRAM_RESEND) {
9520				continue;
9521			}
9522			if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
9523				if (chk != asoc->str_reset) {
9524					/*
9525					 * not eligible for retran if its
9526					 * not ours
9527					 */
9528					continue;
9529				}
9530			}
9531			ctl_cnt++;
9532			if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9533				fwd_tsn = 1;
9534			}
9535			/*
9536			 * Add an AUTH chunk, if chunk requires it save the
9537			 * offset into the chain for AUTH
9538			 */
9539			if ((auth == NULL) &&
9540			    (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
9541			    stcb->asoc.peer_auth_chunks))) {
9542				m = sctp_add_auth_chunk(m, &endofchain,
9543				    &auth, &auth_offset,
9544				    stcb,
9545				    chk->rec.chunk_id.id);
9546				SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9547			}
9548			m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9549			break;
9550		}
9551	}
9552	one_chunk = 0;
9553	cnt_thru = 0;
9554	/* do we have control chunks to retransmit? */
9555	if (m != NULL) {
9556		/* Start a timer no matter if we succeed or fail */
9557		if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
9558			sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
9559		} else if (chk->rec.chunk_id.id == SCTP_ASCONF)
9560			sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
9561		chk->snd_count++;	/* update our count */
9562		if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
9563		    (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
9564		    auth_offset, auth, stcb->asoc.authinfo.active_keyid,
9565		    no_fragmentflg, 0, 0,
9566		    inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9567		    chk->whoTo->port, NULL,
9568		    0, 0,
9569		    so_locked))) {
9570			SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
9571			if (error == ENOBUFS) {
9572				asoc->ifp_had_enobuf = 1;
9573				SCTP_STAT_INCR(sctps_lowlevelerr);
9574			}
9575			return (error);
9576		} else {
9577			asoc->ifp_had_enobuf = 0;
9578		}
9579		endofchain = NULL;
9580		auth = NULL;
9581		auth_offset = 0;
9582		/*
9583		 * We don't want to mark the net->sent time here since this
9584		 * we use this for HB and retrans cannot measure RTT
9585		 */
9586		/* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
9587		*cnt_out += 1;
9588		chk->sent = SCTP_DATAGRAM_SENT;
9589		sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
9590		if (fwd_tsn == 0) {
9591			return (0);
9592		} else {
9593			/* Clean up the fwd-tsn list */
9594			sctp_clean_up_ctl(stcb, asoc, so_locked);
9595			return (0);
9596		}
9597	}
9598	/*
9599	 * Ok, it is just data retransmission we need to do or that and a
9600	 * fwd-tsn with it all.
9601	 */
9602	if (TAILQ_EMPTY(&asoc->sent_queue)) {
9603		return (SCTP_RETRAN_DONE);
9604	}
9605	if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) ||
9606	    (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT)) {
9607		/* not yet open, resend the cookie and that is it */
9608		return (1);
9609	}
9610#ifdef SCTP_AUDITING_ENABLED
9611	sctp_auditing(20, inp, stcb, NULL);
9612#endif
9613	data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
9614	TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
9615		if (chk->sent != SCTP_DATAGRAM_RESEND) {
9616			/* No, not sent to this net or not ready for rtx */
9617			continue;
9618		}
9619		if (chk->data == NULL) {
9620			SCTP_PRINTF("TSN:%x chk->snd_count:%d chk->sent:%d can't retran - no data\n",
9621			    chk->rec.data.tsn, chk->snd_count, chk->sent);
9622			continue;
9623		}
9624		if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
9625		    (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
9626			struct mbuf *op_err;
9627			char msg[SCTP_DIAG_INFO_LEN];
9628
9629			snprintf(msg, sizeof(msg), "TSN %8.8x retransmitted %d times, giving up",
9630			    chk->rec.data.tsn, chk->snd_count);
9631			op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
9632			    msg);
9633			atomic_add_int(&stcb->asoc.refcnt, 1);
9634			sctp_abort_an_association(stcb->sctp_ep, stcb, op_err,
9635			    so_locked);
9636			SCTP_TCB_LOCK(stcb);
9637			atomic_subtract_int(&stcb->asoc.refcnt, 1);
9638			return (SCTP_RETRAN_EXIT);
9639		}
9640		/* pick up the net */
9641		net = chk->whoTo;
9642		switch (net->ro._l_addr.sa.sa_family) {
9643#ifdef INET
9644		case AF_INET:
9645			mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
9646			break;
9647#endif
9648#ifdef INET6
9649		case AF_INET6:
9650			mtu = net->mtu - SCTP_MIN_OVERHEAD;
9651			break;
9652#endif
9653		default:
9654			/* TSNH */
9655			mtu = net->mtu;
9656			break;
9657		}
9658
9659		if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
9660			/* No room in peers rwnd */
9661			uint32_t tsn;
9662
9663			tsn = asoc->last_acked_seq + 1;
9664			if (tsn == chk->rec.data.tsn) {
9665				/*
9666				 * we make a special exception for this
9667				 * case. The peer has no rwnd but is missing
9668				 * the lowest chunk.. which is probably what
9669				 * is holding up the rwnd.
9670				 */
9671				goto one_chunk_around;
9672			}
9673			return (1);
9674		}
9675one_chunk_around:
9676		if (asoc->peers_rwnd < mtu) {
9677			one_chunk = 1;
9678			if ((asoc->peers_rwnd == 0) &&
9679			    (asoc->total_flight == 0)) {
9680				chk->window_probe = 1;
9681				chk->whoTo->window_probe = 1;
9682			}
9683		}
9684#ifdef SCTP_AUDITING_ENABLED
9685		sctp_audit_log(0xC3, 2);
9686#endif
9687		bundle_at = 0;
9688		m = NULL;
9689		net->fast_retran_ip = 0;
9690		if (chk->rec.data.doing_fast_retransmit == 0) {
9691			/*
9692			 * if no FR in progress skip destination that have
9693			 * flight_size > cwnd.
9694			 */
9695			if (net->flight_size >= net->cwnd) {
9696				continue;
9697			}
9698		} else {
9699			/*
9700			 * Mark the destination net to have FR recovery
9701			 * limits put on it.
9702			 */
9703			*fr_done = 1;
9704			net->fast_retran_ip = 1;
9705		}
9706
9707		/*
9708		 * if no AUTH is yet included and this chunk requires it,
9709		 * make sure to account for it.  We don't apply the size
9710		 * until the AUTH chunk is actually added below in case
9711		 * there is no room for this chunk.
9712		 */
9713		if (data_auth_reqd && (auth == NULL)) {
9714			dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9715		} else
9716			dmtu = 0;
9717
9718		if ((chk->send_size <= (mtu - dmtu)) ||
9719		    (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
9720			/* ok we will add this one */
9721			if (data_auth_reqd) {
9722				if (auth == NULL) {
9723					m = sctp_add_auth_chunk(m,
9724					    &endofchain,
9725					    &auth,
9726					    &auth_offset,
9727					    stcb,
9728					    SCTP_DATA);
9729					auth_keyid = chk->auth_keyid;
9730					override_ok = 0;
9731					SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9732				} else if (override_ok) {
9733					auth_keyid = chk->auth_keyid;
9734					override_ok = 0;
9735				} else if (chk->auth_keyid != auth_keyid) {
9736					/* different keyid, so done bundling */
9737					break;
9738				}
9739			}
9740			m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9741			if (m == NULL) {
9742				SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9743				return (ENOMEM);
9744			}
9745			/* Do clear IP_DF ? */
9746			if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9747				no_fragmentflg = 0;
9748			}
9749			/* upate our MTU size */
9750			if (mtu > (chk->send_size + dmtu))
9751				mtu -= (chk->send_size + dmtu);
9752			else
9753				mtu = 0;
9754			data_list[bundle_at++] = chk;
9755			if (one_chunk && (asoc->total_flight <= 0)) {
9756				SCTP_STAT_INCR(sctps_windowprobed);
9757			}
9758		}
9759		if (one_chunk == 0) {
9760			/*
9761			 * now are there anymore forward from chk to pick
9762			 * up?
9763			 */
9764			for (fwd = TAILQ_NEXT(chk, sctp_next); fwd != NULL; fwd = TAILQ_NEXT(fwd, sctp_next)) {
9765				if (fwd->sent != SCTP_DATAGRAM_RESEND) {
9766					/* Nope, not for retran */
9767					continue;
9768				}
9769				if (fwd->whoTo != net) {
9770					/* Nope, not the net in question */
9771					continue;
9772				}
9773				if (data_auth_reqd && (auth == NULL)) {
9774					dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9775				} else
9776					dmtu = 0;
9777				if (fwd->send_size <= (mtu - dmtu)) {
9778					if (data_auth_reqd) {
9779						if (auth == NULL) {
9780							m = sctp_add_auth_chunk(m,
9781							    &endofchain,
9782							    &auth,
9783							    &auth_offset,
9784							    stcb,
9785							    SCTP_DATA);
9786							auth_keyid = fwd->auth_keyid;
9787							override_ok = 0;
9788							SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9789						} else if (override_ok) {
9790							auth_keyid = fwd->auth_keyid;
9791							override_ok = 0;
9792						} else if (fwd->auth_keyid != auth_keyid) {
9793							/*
9794							 * different keyid,
9795							 * so done bundling
9796							 */
9797							break;
9798						}
9799					}
9800					m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
9801					if (m == NULL) {
9802						SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9803						return (ENOMEM);
9804					}
9805					/* Do clear IP_DF ? */
9806					if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9807						no_fragmentflg = 0;
9808					}
9809					/* upate our MTU size */
9810					if (mtu > (fwd->send_size + dmtu))
9811						mtu -= (fwd->send_size + dmtu);
9812					else
9813						mtu = 0;
9814					data_list[bundle_at++] = fwd;
9815					if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
9816						break;
9817					}
9818				} else {
9819					/* can't fit so we are done */
9820					break;
9821				}
9822			}
9823		}
9824		/* Is there something to send for this destination? */
9825		if (m) {
9826			/*
9827			 * No matter if we fail/or succeed we should start a
9828			 * timer. A failure is like a lost IP packet :-)
9829			 */
9830			if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9831				/*
9832				 * no timer running on this destination
9833				 * restart it.
9834				 */
9835				sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9836				tmr_started = 1;
9837			}
9838			/* Now lets send it, if there is anything to send :> */
9839			if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
9840			    (struct sockaddr *)&net->ro._l_addr, m,
9841			    auth_offset, auth, auth_keyid,
9842			    no_fragmentflg, 0, 0,
9843			    inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9844			    net->port, NULL,
9845			    0, 0,
9846			    so_locked))) {
9847				/* error, we could not output */
9848				SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
9849				if (error == ENOBUFS) {
9850					asoc->ifp_had_enobuf = 1;
9851					SCTP_STAT_INCR(sctps_lowlevelerr);
9852				}
9853				return (error);
9854			} else {
9855				asoc->ifp_had_enobuf = 0;
9856			}
9857			endofchain = NULL;
9858			auth = NULL;
9859			auth_offset = 0;
9860			/* For HB's */
9861			/*
9862			 * We don't want to mark the net->sent time here
9863			 * since this we use this for HB and retrans cannot
9864			 * measure RTT
9865			 */
9866			/* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
9867
9868			/* For auto-close */
9869			cnt_thru++;
9870			if (*now_filled == 0) {
9871				(void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
9872				*now = asoc->time_last_sent;
9873				*now_filled = 1;
9874			} else {
9875				asoc->time_last_sent = *now;
9876			}
9877			*cnt_out += bundle_at;
9878#ifdef SCTP_AUDITING_ENABLED
9879			sctp_audit_log(0xC4, bundle_at);
9880#endif
9881			if (bundle_at) {
9882				tsns_sent = data_list[0]->rec.data.tsn;
9883			}
9884			for (i = 0; i < bundle_at; i++) {
9885				SCTP_STAT_INCR(sctps_sendretransdata);
9886				data_list[i]->sent = SCTP_DATAGRAM_SENT;
9887				/*
9888				 * When we have a revoked data, and we
9889				 * retransmit it, then we clear the revoked
9890				 * flag since this flag dictates if we
9891				 * subtracted from the fs
9892				 */
9893				if (data_list[i]->rec.data.chunk_was_revoked) {
9894					/* Deflate the cwnd */
9895					data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
9896					data_list[i]->rec.data.chunk_was_revoked = 0;
9897				}
9898				data_list[i]->snd_count++;
9899				sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9900				/* record the time */
9901				data_list[i]->sent_rcv_time = asoc->time_last_sent;
9902				if (data_list[i]->book_size_scale) {
9903					/*
9904					 * need to double the book size on
9905					 * this one
9906					 */
9907					data_list[i]->book_size_scale = 0;
9908					/*
9909					 * Since we double the booksize, we
9910					 * must also double the output queue
9911					 * size, since this get shrunk when
9912					 * we free by this amount.
9913					 */
9914					atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
9915					data_list[i]->book_size *= 2;
9916
9917
9918				} else {
9919					if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
9920						sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
9921						    asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
9922					}
9923					asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
9924					    (uint32_t)(data_list[i]->send_size +
9925					    SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
9926				}
9927				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
9928					sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
9929					    data_list[i]->whoTo->flight_size,
9930					    data_list[i]->book_size,
9931					    (uint32_t)(uintptr_t)data_list[i]->whoTo,
9932					    data_list[i]->rec.data.tsn);
9933				}
9934				sctp_flight_size_increase(data_list[i]);
9935				sctp_total_flight_increase(stcb, data_list[i]);
9936				if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
9937					/* SWS sender side engages */
9938					asoc->peers_rwnd = 0;
9939				}
9940				if ((i == 0) &&
9941				    (data_list[i]->rec.data.doing_fast_retransmit)) {
9942					SCTP_STAT_INCR(sctps_sendfastretrans);
9943					if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
9944					    (tmr_started == 0)) {
9945						/*-
9946						 * ok we just fast-retrans'd
9947						 * the lowest TSN, i.e the
9948						 * first on the list. In
9949						 * this case we want to give
9950						 * some more time to get a
9951						 * SACK back without a
9952						 * t3-expiring.
9953						 */
9954						sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
9955						    SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_2);
9956						sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9957					}
9958				}
9959			}
9960			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9961				sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
9962			}
9963#ifdef SCTP_AUDITING_ENABLED
9964			sctp_auditing(21, inp, stcb, NULL);
9965#endif
9966		} else {
9967			/* None will fit */
9968			return (1);
9969		}
9970		if (asoc->sent_queue_retran_cnt <= 0) {
9971			/* all done we have no more to retran */
9972			asoc->sent_queue_retran_cnt = 0;
9973			break;
9974		}
9975		if (one_chunk) {
9976			/* No more room in rwnd */
9977			return (1);
9978		}
9979		/* stop the for loop here. we sent out a packet */
9980		break;
9981	}
9982	return (0);
9983}
9984
9985static void
9986sctp_timer_validation(struct sctp_inpcb *inp,
9987    struct sctp_tcb *stcb,
9988    struct sctp_association *asoc)
9989{
9990	struct sctp_nets *net;
9991
9992	/* Validate that a timer is running somewhere */
9993	TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9994		if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9995			/* Here is a timer */
9996			return;
9997		}
9998	}
9999	SCTP_TCB_LOCK_ASSERT(stcb);
10000	/* Gak, we did not have a timer somewhere */
10001	SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
10002	if (asoc->alternate) {
10003		sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->alternate);
10004	} else {
10005		sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
10006	}
10007	return;
10008}
10009
10010void
10011sctp_chunk_output(struct sctp_inpcb *inp,
10012    struct sctp_tcb *stcb,
10013    int from_where,
10014    int so_locked
10015#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10016    SCTP_UNUSED
10017#endif
10018)
10019{
10020	/*-
10021	 * Ok this is the generic chunk service queue. we must do the
10022	 * following:
10023	 * - See if there are retransmits pending, if so we must
10024	 *   do these first.
10025	 * - Service the stream queue that is next, moving any
10026	 *   message (note I must get a complete message i.e.
10027	 *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
10028	 *   TSN's
10029	 * - Check to see if the cwnd/rwnd allows any output, if so we
10030	 *   go ahead and fomulate and send the low level chunks. Making sure
10031	 *   to combine any control in the control chunk queue also.
10032	 */
10033	struct sctp_association *asoc;
10034	struct sctp_nets *net;
10035	int error = 0, num_out, tot_out = 0, ret = 0, reason_code;
10036	unsigned int burst_cnt = 0;
10037	struct timeval now;
10038	int now_filled = 0;
10039	int nagle_on;
10040	int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
10041	int un_sent = 0;
10042	int fr_done;
10043	unsigned int tot_frs = 0;
10044
10045	asoc = &stcb->asoc;
10046do_it_again:
10047	/* The Nagle algorithm is only applied when handling a send call. */
10048	if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
10049		if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
10050			nagle_on = 0;
10051		} else {
10052			nagle_on = 1;
10053		}
10054	} else {
10055		nagle_on = 0;
10056	}
10057	SCTP_TCB_LOCK_ASSERT(stcb);
10058
10059	un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
10060
10061	if ((un_sent <= 0) &&
10062	    (TAILQ_EMPTY(&asoc->control_send_queue)) &&
10063	    (TAILQ_EMPTY(&asoc->asconf_send_queue)) &&
10064	    (asoc->sent_queue_retran_cnt == 0) &&
10065	    (asoc->trigger_reset == 0)) {
10066		/* Nothing to do unless there is something to be sent left */
10067		return;
10068	}
10069	/*
10070	 * Do we have something to send, data or control AND a sack timer
10071	 * running, if so piggy-back the sack.
10072	 */
10073	if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
10074		sctp_send_sack(stcb, so_locked);
10075		sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, NULL,
10076		    SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_3);
10077	}
10078	while (asoc->sent_queue_retran_cnt) {
10079		/*-
10080		 * Ok, it is retransmission time only, we send out only ONE
10081		 * packet with a single call off to the retran code.
10082		 */
10083		if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
10084			/*-
10085			 * Special hook for handling cookiess discarded
10086			 * by peer that carried data. Send cookie-ack only
10087			 * and then the next call with get the retran's.
10088			 */
10089			(void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10090			    from_where,
10091			    &now, &now_filled, frag_point, so_locked);
10092			return;
10093		} else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
10094			/* if its not from a HB then do it */
10095			fr_done = 0;
10096			ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
10097			if (fr_done) {
10098				tot_frs++;
10099			}
10100		} else {
10101			/*
10102			 * its from any other place, we don't allow retran
10103			 * output (only control)
10104			 */
10105			ret = 1;
10106		}
10107		if (ret > 0) {
10108			/* Can't send anymore */
10109			/*-
10110			 * now lets push out control by calling med-level
10111			 * output once. this assures that we WILL send HB's
10112			 * if queued too.
10113			 */
10114			(void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10115			    from_where,
10116			    &now, &now_filled, frag_point, so_locked);
10117#ifdef SCTP_AUDITING_ENABLED
10118			sctp_auditing(8, inp, stcb, NULL);
10119#endif
10120			sctp_timer_validation(inp, stcb, asoc);
10121			return;
10122		}
10123		if (ret < 0) {
10124			/*-
10125			 * The count was off.. retran is not happening so do
10126			 * the normal retransmission.
10127			 */
10128#ifdef SCTP_AUDITING_ENABLED
10129			sctp_auditing(9, inp, stcb, NULL);
10130#endif
10131			if (ret == SCTP_RETRAN_EXIT) {
10132				return;
10133			}
10134			break;
10135		}
10136		if (from_where == SCTP_OUTPUT_FROM_T3) {
10137			/* Only one transmission allowed out of a timeout */
10138#ifdef SCTP_AUDITING_ENABLED
10139			sctp_auditing(10, inp, stcb, NULL);
10140#endif
10141			/* Push out any control */
10142			(void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
10143			    &now, &now_filled, frag_point, so_locked);
10144			return;
10145		}
10146		if ((asoc->fr_max_burst > 0) && (tot_frs >= asoc->fr_max_burst)) {
10147			/* Hit FR burst limit */
10148			return;
10149		}
10150		if ((num_out == 0) && (ret == 0)) {
10151			/* No more retrans to send */
10152			break;
10153		}
10154	}
10155#ifdef SCTP_AUDITING_ENABLED
10156	sctp_auditing(12, inp, stcb, NULL);
10157#endif
10158	/* Check for bad destinations, if they exist move chunks around. */
10159	TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
10160		if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
10161			/*-
10162			 * if possible move things off of this address we
10163			 * still may send below due to the dormant state but
10164			 * we try to find an alternate address to send to
10165			 * and if we have one we move all queued data on the
10166			 * out wheel to this alternate address.
10167			 */
10168			if (net->ref_count > 1)
10169				sctp_move_chunks_from_net(stcb, net);
10170		} else {
10171			/*-
10172			 * if ((asoc->sat_network) || (net->addr_is_local))
10173			 * { burst_limit = asoc->max_burst *
10174			 * SCTP_SAT_NETWORK_BURST_INCR; }
10175			 */
10176			if (asoc->max_burst > 0) {
10177				if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
10178					if ((net->flight_size + (asoc->max_burst * net->mtu)) < net->cwnd) {
10179						/*
10180						 * JRS - Use the congestion
10181						 * control given in the
10182						 * congestion control module
10183						 */
10184						asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, asoc->max_burst);
10185						if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10186							sctp_log_maxburst(stcb, net, 0, asoc->max_burst, SCTP_MAX_BURST_APPLIED);
10187						}
10188						SCTP_STAT_INCR(sctps_maxburstqueued);
10189					}
10190					net->fast_retran_ip = 0;
10191				} else {
10192					if (net->flight_size == 0) {
10193						/*
10194						 * Should be decaying the
10195						 * cwnd here
10196						 */
10197						;
10198					}
10199				}
10200			}
10201		}
10202
10203	}
10204	burst_cnt = 0;
10205	do {
10206		error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
10207		    &reason_code, 0, from_where,
10208		    &now, &now_filled, frag_point, so_locked);
10209		if (error) {
10210			SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
10211			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10212				sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
10213			}
10214			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10215				sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
10216				sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
10217			}
10218			break;
10219		}
10220		SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
10221
10222		tot_out += num_out;
10223		burst_cnt++;
10224		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10225			sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
10226			if (num_out == 0) {
10227				sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
10228			}
10229		}
10230		if (nagle_on) {
10231			/*
10232			 * When the Nagle algorithm is used, look at how
10233			 * much is unsent, then if its smaller than an MTU
10234			 * and we have data in flight we stop, except if we
10235			 * are handling a fragmented user message.
10236			 */
10237			un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
10238			if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
10239			    (stcb->asoc.total_flight > 0)) {
10240/*	&&		     sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {*/
10241				break;
10242			}
10243		}
10244		if (TAILQ_EMPTY(&asoc->control_send_queue) &&
10245		    TAILQ_EMPTY(&asoc->send_queue) &&
10246		    sctp_is_there_unsent_data(stcb, so_locked) == 0) {
10247			/* Nothing left to send */
10248			break;
10249		}
10250		if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
10251			/* Nothing left to send */
10252			break;
10253		}
10254	} while (num_out &&
10255	    ((asoc->max_burst == 0) ||
10256	    SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
10257	    (burst_cnt < asoc->max_burst)));
10258
10259	if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
10260		if ((asoc->max_burst > 0) && (burst_cnt >= asoc->max_burst)) {
10261			SCTP_STAT_INCR(sctps_maxburstqueued);
10262			asoc->burst_limit_applied = 1;
10263			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10264				sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
10265			}
10266		} else {
10267			asoc->burst_limit_applied = 0;
10268		}
10269	}
10270	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10271		sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
10272	}
10273	SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
10274	    tot_out);
10275
10276	/*-
10277	 * Now we need to clean up the control chunk chain if a ECNE is on
10278	 * it. It must be marked as UNSENT again so next call will continue
10279	 * to send it until such time that we get a CWR, to remove it.
10280	 */
10281	if (stcb->asoc.ecn_echo_cnt_onq)
10282		sctp_fix_ecn_echo(asoc);
10283
10284	if (stcb->asoc.trigger_reset) {
10285		if (sctp_send_stream_reset_out_if_possible(stcb, so_locked) == 0) {
10286			goto do_it_again;
10287		}
10288	}
10289	return;
10290}
10291
10292
10293int
10294sctp_output(
10295    struct sctp_inpcb *inp,
10296    struct mbuf *m,
10297    struct sockaddr *addr,
10298    struct mbuf *control,
10299    struct thread *p,
10300    int flags)
10301{
10302	if (inp == NULL) {
10303		SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10304		return (EINVAL);
10305	}
10306
10307	if (inp->sctp_socket == NULL) {
10308		SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10309		return (EINVAL);
10310	}
10311	return (sctp_sosend(inp->sctp_socket,
10312	    addr,
10313	    (struct uio *)NULL,
10314	    m,
10315	    control,
10316	    flags, p
10317	    ));
10318}
10319
10320void
10321send_forward_tsn(struct sctp_tcb *stcb,
10322    struct sctp_association *asoc)
10323{
10324	struct sctp_tmit_chunk *chk, *at, *tp1, *last;
10325	struct sctp_forward_tsn_chunk *fwdtsn;
10326	struct sctp_strseq *strseq;
10327	struct sctp_strseq_mid *strseq_m;
10328	uint32_t advance_peer_ack_point;
10329	unsigned int cnt_of_space, i, ovh;
10330	unsigned int space_needed;
10331	unsigned int cnt_of_skipped = 0;
10332
10333	SCTP_TCB_LOCK_ASSERT(stcb);
10334	TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10335		if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
10336			/* mark it to unsent */
10337			chk->sent = SCTP_DATAGRAM_UNSENT;
10338			chk->snd_count = 0;
10339			/* Do we correct its output location? */
10340			if (chk->whoTo) {
10341				sctp_free_remote_addr(chk->whoTo);
10342				chk->whoTo = NULL;
10343			}
10344			goto sctp_fill_in_rest;
10345		}
10346	}
10347	/* Ok if we reach here we must build one */
10348	sctp_alloc_a_chunk(stcb, chk);
10349	if (chk == NULL) {
10350		return;
10351	}
10352	asoc->fwd_tsn_cnt++;
10353	chk->copy_by_ref = 0;
10354	/*
10355	 * We don't do the old thing here since this is used not for on-wire
10356	 * but to tell if we are sending a fwd-tsn by the stack during
10357	 * output. And if its a IFORWARD or a FORWARD it is a fwd-tsn.
10358	 */
10359	chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
10360	chk->rec.chunk_id.can_take_data = 0;
10361	chk->flags = 0;
10362	chk->asoc = asoc;
10363	chk->whoTo = NULL;
10364	chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
10365	if (chk->data == NULL) {
10366		sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
10367		return;
10368	}
10369	SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10370	chk->sent = SCTP_DATAGRAM_UNSENT;
10371	chk->snd_count = 0;
10372	TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
10373	asoc->ctrl_queue_cnt++;
10374sctp_fill_in_rest:
10375	/*-
10376	 * Here we go through and fill out the part that deals with
10377	 * stream/seq of the ones we skip.
10378	 */
10379	SCTP_BUF_LEN(chk->data) = 0;
10380	TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10381		if ((at->sent != SCTP_FORWARD_TSN_SKIP) &&
10382		    (at->sent != SCTP_DATAGRAM_NR_ACKED)) {
10383			/* no more to look at */
10384			break;
10385		}
10386		if (!asoc->idata_supported && (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
10387			/* We don't report these */
10388			continue;
10389		}
10390		cnt_of_skipped++;
10391	}
10392	if (asoc->idata_supported) {
10393		space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10394		    (cnt_of_skipped * sizeof(struct sctp_strseq_mid)));
10395	} else {
10396		space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10397		    (cnt_of_skipped * sizeof(struct sctp_strseq)));
10398	}
10399	cnt_of_space = (unsigned int)M_TRAILINGSPACE(chk->data);
10400
10401	if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
10402		ovh = SCTP_MIN_OVERHEAD;
10403	} else {
10404		ovh = SCTP_MIN_V4_OVERHEAD;
10405	}
10406	if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
10407		/* trim to a mtu size */
10408		cnt_of_space = asoc->smallest_mtu - ovh;
10409	}
10410	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10411		sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10412		    0xff, 0, cnt_of_skipped,
10413		    asoc->advanced_peer_ack_point);
10414	}
10415	advance_peer_ack_point = asoc->advanced_peer_ack_point;
10416	if (cnt_of_space < space_needed) {
10417		/*-
10418		 * ok we must trim down the chunk by lowering the
10419		 * advance peer ack point.
10420		 */
10421		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10422			sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10423			    0xff, 0xff, cnt_of_space,
10424			    space_needed);
10425		}
10426		cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
10427		if (asoc->idata_supported) {
10428			cnt_of_skipped /= sizeof(struct sctp_strseq_mid);
10429		} else {
10430			cnt_of_skipped /= sizeof(struct sctp_strseq);
10431		}
10432		/*-
10433		 * Go through and find the TSN that will be the one
10434		 * we report.
10435		 */
10436		at = TAILQ_FIRST(&asoc->sent_queue);
10437		if (at != NULL) {
10438			for (i = 0; i < cnt_of_skipped; i++) {
10439				tp1 = TAILQ_NEXT(at, sctp_next);
10440				if (tp1 == NULL) {
10441					break;
10442				}
10443				at = tp1;
10444			}
10445		}
10446		if (at && SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10447			sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10448			    0xff, cnt_of_skipped, at->rec.data.tsn,
10449			    asoc->advanced_peer_ack_point);
10450		}
10451		last = at;
10452		/*-
10453		 * last now points to last one I can report, update
10454		 * peer ack point
10455		 */
10456		if (last) {
10457			advance_peer_ack_point = last->rec.data.tsn;
10458		}
10459		if (asoc->idata_supported) {
10460			space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10461			    cnt_of_skipped * sizeof(struct sctp_strseq_mid);
10462		} else {
10463			space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10464			    cnt_of_skipped * sizeof(struct sctp_strseq);
10465		}
10466	}
10467	chk->send_size = space_needed;
10468	/* Setup the chunk */
10469	fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
10470	fwdtsn->ch.chunk_length = htons(chk->send_size);
10471	fwdtsn->ch.chunk_flags = 0;
10472	if (asoc->idata_supported) {
10473		fwdtsn->ch.chunk_type = SCTP_IFORWARD_CUM_TSN;
10474	} else {
10475		fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
10476	}
10477	fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
10478	SCTP_BUF_LEN(chk->data) = chk->send_size;
10479	fwdtsn++;
10480	/*-
10481	 * Move pointer to after the fwdtsn and transfer to the
10482	 * strseq pointer.
10483	 */
10484	if (asoc->idata_supported) {
10485		strseq_m = (struct sctp_strseq_mid *)fwdtsn;
10486		strseq = NULL;
10487	} else {
10488		strseq = (struct sctp_strseq *)fwdtsn;
10489		strseq_m = NULL;
10490	}
10491	/*-
10492	 * Now populate the strseq list. This is done blindly
10493	 * without pulling out duplicate stream info. This is
10494	 * inefficent but won't harm the process since the peer will
10495	 * look at these in sequence and will thus release anything.
10496	 * It could mean we exceed the PMTU and chop off some that
10497	 * we could have included.. but this is unlikely (aka 1432/4
10498	 * would mean 300+ stream seq's would have to be reported in
10499	 * one FWD-TSN. With a bit of work we can later FIX this to
10500	 * optimize and pull out duplicates.. but it does add more
10501	 * overhead. So for now... not!
10502	 */
10503	i = 0;
10504	TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10505		if (i >= cnt_of_skipped) {
10506			break;
10507		}
10508		if (!asoc->idata_supported && (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
10509			/* We don't report these */
10510			continue;
10511		}
10512		if (at->rec.data.tsn == advance_peer_ack_point) {
10513			at->rec.data.fwd_tsn_cnt = 0;
10514		}
10515		if (asoc->idata_supported) {
10516			strseq_m->sid = htons(at->rec.data.sid);
10517			if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10518				strseq_m->flags = htons(PR_SCTP_UNORDERED_FLAG);
10519			} else {
10520				strseq_m->flags = 0;
10521			}
10522			strseq_m->mid = htonl(at->rec.data.mid);
10523			strseq_m++;
10524		} else {
10525			strseq->sid = htons(at->rec.data.sid);
10526			strseq->ssn = htons((uint16_t)at->rec.data.mid);
10527			strseq++;
10528		}
10529		i++;
10530	}
10531	return;
10532}
10533
10534void
10535sctp_send_sack(struct sctp_tcb *stcb, int so_locked
10536#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10537    SCTP_UNUSED
10538#endif
10539)
10540{
10541	/*-
10542	 * Queue up a SACK or NR-SACK in the control queue.
10543	 * We must first check to see if a SACK or NR-SACK is
10544	 * somehow on the control queue.
10545	 * If so, we will take and and remove the old one.
10546	 */
10547	struct sctp_association *asoc;
10548	struct sctp_tmit_chunk *chk, *a_chk;
10549	struct sctp_sack_chunk *sack;
10550	struct sctp_nr_sack_chunk *nr_sack;
10551	struct sctp_gap_ack_block *gap_descriptor;
10552	const struct sack_track *selector;
10553	int mergeable = 0;
10554	int offset;
10555	caddr_t limit;
10556	uint32_t *dup;
10557	int limit_reached = 0;
10558	unsigned int i, siz, j;
10559	unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
10560	int num_dups = 0;
10561	int space_req;
10562	uint32_t highest_tsn;
10563	uint8_t flags;
10564	uint8_t type;
10565	uint8_t tsn_map;
10566
10567	if (stcb->asoc.nrsack_supported == 1) {
10568		type = SCTP_NR_SELECTIVE_ACK;
10569	} else {
10570		type = SCTP_SELECTIVE_ACK;
10571	}
10572	a_chk = NULL;
10573	asoc = &stcb->asoc;
10574	SCTP_TCB_LOCK_ASSERT(stcb);
10575	if (asoc->last_data_chunk_from == NULL) {
10576		/* Hmm we never received anything */
10577		return;
10578	}
10579	sctp_slide_mapping_arrays(stcb);
10580	sctp_set_rwnd(stcb, asoc);
10581	TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10582		if (chk->rec.chunk_id.id == type) {
10583			/* Hmm, found a sack already on queue, remove it */
10584			TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
10585			asoc->ctrl_queue_cnt--;
10586			a_chk = chk;
10587			if (a_chk->data) {
10588				sctp_m_freem(a_chk->data);
10589				a_chk->data = NULL;
10590			}
10591			if (a_chk->whoTo) {
10592				sctp_free_remote_addr(a_chk->whoTo);
10593				a_chk->whoTo = NULL;
10594			}
10595			break;
10596		}
10597	}
10598	if (a_chk == NULL) {
10599		sctp_alloc_a_chunk(stcb, a_chk);
10600		if (a_chk == NULL) {
10601			/* No memory so we drop the idea, and set a timer */
10602			if (stcb->asoc.delayed_ack) {
10603				sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10604				    stcb->sctp_ep, stcb, NULL,
10605				    SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
10606				sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10607				    stcb->sctp_ep, stcb, NULL);
10608			} else {
10609				stcb->asoc.send_sack = 1;
10610			}
10611			return;
10612		}
10613		a_chk->copy_by_ref = 0;
10614		a_chk->rec.chunk_id.id = type;
10615		a_chk->rec.chunk_id.can_take_data = 1;
10616	}
10617	/* Clear our pkt counts */
10618	asoc->data_pkts_seen = 0;
10619
10620	a_chk->flags = 0;
10621	a_chk->asoc = asoc;
10622	a_chk->snd_count = 0;
10623	a_chk->send_size = 0;	/* fill in later */
10624	a_chk->sent = SCTP_DATAGRAM_UNSENT;
10625	a_chk->whoTo = NULL;
10626
10627	if (!(asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE)) {
10628		/*-
10629		 * Ok, the destination for the SACK is unreachable, lets see if
10630		 * we can select an alternate to asoc->last_data_chunk_from
10631		 */
10632		a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
10633		if (a_chk->whoTo == NULL) {
10634			/* Nope, no alternate */
10635			a_chk->whoTo = asoc->last_data_chunk_from;
10636		}
10637	} else {
10638		a_chk->whoTo = asoc->last_data_chunk_from;
10639	}
10640	if (a_chk->whoTo) {
10641		atomic_add_int(&a_chk->whoTo->ref_count, 1);
10642	}
10643	if (SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->highest_tsn_inside_nr_map)) {
10644		highest_tsn = asoc->highest_tsn_inside_map;
10645	} else {
10646		highest_tsn = asoc->highest_tsn_inside_nr_map;
10647	}
10648	if (highest_tsn == asoc->cumulative_tsn) {
10649		/* no gaps */
10650		if (type == SCTP_SELECTIVE_ACK) {
10651			space_req = sizeof(struct sctp_sack_chunk);
10652		} else {
10653			space_req = sizeof(struct sctp_nr_sack_chunk);
10654		}
10655	} else {
10656		/* gaps get a cluster */
10657		space_req = MCLBYTES;
10658	}
10659	/* Ok now lets formulate a MBUF with our sack */
10660	a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_NOWAIT, 1, MT_DATA);
10661	if ((a_chk->data == NULL) ||
10662	    (a_chk->whoTo == NULL)) {
10663		/* rats, no mbuf memory */
10664		if (a_chk->data) {
10665			/* was a problem with the destination */
10666			sctp_m_freem(a_chk->data);
10667			a_chk->data = NULL;
10668		}
10669		sctp_free_a_chunk(stcb, a_chk, so_locked);
10670		/* sa_ignore NO_NULL_CHK */
10671		if (stcb->asoc.delayed_ack) {
10672			sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10673			    stcb->sctp_ep, stcb, NULL,
10674			    SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
10675			sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10676			    stcb->sctp_ep, stcb, NULL);
10677		} else {
10678			stcb->asoc.send_sack = 1;
10679		}
10680		return;
10681	}
10682	/* ok, lets go through and fill it in */
10683	SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10684	space = (unsigned int)M_TRAILINGSPACE(a_chk->data);
10685	if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10686		space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10687	}
10688	limit = mtod(a_chk->data, caddr_t);
10689	limit += space;
10690
10691	flags = 0;
10692
10693	if ((asoc->sctp_cmt_on_off > 0) &&
10694	    SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10695		/*-
10696		 * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10697		 * received, then set high bit to 1, else 0. Reset
10698		 * pkts_rcvd.
10699		 */
10700		flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10701		asoc->cmt_dac_pkts_rcvd = 0;
10702	}
10703#ifdef SCTP_ASOCLOG_OF_TSNS
10704	stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10705	stcb->asoc.cumack_log_atsnt++;
10706	if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10707		stcb->asoc.cumack_log_atsnt = 0;
10708	}
10709#endif
10710	/* reset the readers interpretation */
10711	stcb->freed_by_sorcv_sincelast = 0;
10712
10713	if (type == SCTP_SELECTIVE_ACK) {
10714		sack = mtod(a_chk->data, struct sctp_sack_chunk *);
10715		nr_sack = NULL;
10716		gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
10717		if (highest_tsn > asoc->mapping_array_base_tsn) {
10718			siz = (((highest_tsn - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10719		} else {
10720			siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + highest_tsn + 7) / 8;
10721		}
10722	} else {
10723		sack = NULL;
10724		nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
10725		gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
10726		if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn) {
10727			siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10728		} else {
10729			siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10730		}
10731	}
10732
10733	if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10734		offset = 1;
10735	} else {
10736		offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10737	}
10738	if (((type == SCTP_SELECTIVE_ACK) &&
10739	    SCTP_TSN_GT(highest_tsn, asoc->cumulative_tsn)) ||
10740	    ((type == SCTP_NR_SELECTIVE_ACK) &&
10741	    SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->cumulative_tsn))) {
10742		/* we have a gap .. maybe */
10743		for (i = 0; i < siz; i++) {
10744			tsn_map = asoc->mapping_array[i];
10745			if (type == SCTP_SELECTIVE_ACK) {
10746				tsn_map |= asoc->nr_mapping_array[i];
10747			}
10748			if (i == 0) {
10749				/*
10750				 * Clear all bits corresponding to TSNs
10751				 * smaller or equal to the cumulative TSN.
10752				 */
10753				tsn_map &= (~0U << (1 - offset));
10754			}
10755			selector = &sack_array[tsn_map];
10756			if (mergeable && selector->right_edge) {
10757				/*
10758				 * Backup, left and right edges were ok to
10759				 * merge.
10760				 */
10761				num_gap_blocks--;
10762				gap_descriptor--;
10763			}
10764			if (selector->num_entries == 0)
10765				mergeable = 0;
10766			else {
10767				for (j = 0; j < selector->num_entries; j++) {
10768					if (mergeable && selector->right_edge) {
10769						/*
10770						 * do a merge by NOT setting
10771						 * the left side
10772						 */
10773						mergeable = 0;
10774					} else {
10775						/*
10776						 * no merge, set the left
10777						 * side
10778						 */
10779						mergeable = 0;
10780						gap_descriptor->start = htons((selector->gaps[j].start + offset));
10781					}
10782					gap_descriptor->end = htons((selector->gaps[j].end + offset));
10783					num_gap_blocks++;
10784					gap_descriptor++;
10785					if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10786						/* no more room */
10787						limit_reached = 1;
10788						break;
10789					}
10790				}
10791				if (selector->left_edge) {
10792					mergeable = 1;
10793				}
10794			}
10795			if (limit_reached) {
10796				/* Reached the limit stop */
10797				break;
10798			}
10799			offset += 8;
10800		}
10801	}
10802	if ((type == SCTP_NR_SELECTIVE_ACK) &&
10803	    (limit_reached == 0)) {
10804
10805		mergeable = 0;
10806
10807		if (asoc->highest_tsn_inside_nr_map > asoc->mapping_array_base_tsn) {
10808			siz = (((asoc->highest_tsn_inside_nr_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10809		} else {
10810			siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10811		}
10812
10813		if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10814			offset = 1;
10815		} else {
10816			offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10817		}
10818		if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn)) {
10819			/* we have a gap .. maybe */
10820			for (i = 0; i < siz; i++) {
10821				tsn_map = asoc->nr_mapping_array[i];
10822				if (i == 0) {
10823					/*
10824					 * Clear all bits corresponding to
10825					 * TSNs smaller or equal to the
10826					 * cumulative TSN.
10827					 */
10828					tsn_map &= (~0U << (1 - offset));
10829				}
10830				selector = &sack_array[tsn_map];
10831				if (mergeable && selector->right_edge) {
10832					/*
10833					 * Backup, left and right edges were
10834					 * ok to merge.
10835					 */
10836					num_nr_gap_blocks--;
10837					gap_descriptor--;
10838				}
10839				if (selector->num_entries == 0)
10840					mergeable = 0;
10841				else {
10842					for (j = 0; j < selector->num_entries; j++) {
10843						if (mergeable && selector->right_edge) {
10844							/*
10845							 * do a merge by NOT
10846							 * setting the left
10847							 * side
10848							 */
10849							mergeable = 0;
10850						} else {
10851							/*
10852							 * no merge, set the
10853							 * left side
10854							 */
10855							mergeable = 0;
10856							gap_descriptor->start = htons((selector->gaps[j].start + offset));
10857						}
10858						gap_descriptor->end = htons((selector->gaps[j].end + offset));
10859						num_nr_gap_blocks++;
10860						gap_descriptor++;
10861						if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10862							/* no more room */
10863							limit_reached = 1;
10864							break;
10865						}
10866					}
10867					if (selector->left_edge) {
10868						mergeable = 1;
10869					}
10870				}
10871				if (limit_reached) {
10872					/* Reached the limit stop */
10873					break;
10874				}
10875				offset += 8;
10876			}
10877		}
10878	}
10879	/* now we must add any dups we are going to report. */
10880	if ((limit_reached == 0) && (asoc->numduptsns)) {
10881		dup = (uint32_t *)gap_descriptor;
10882		for (i = 0; i < asoc->numduptsns; i++) {
10883			*dup = htonl(asoc->dup_tsns[i]);
10884			dup++;
10885			num_dups++;
10886			if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10887				/* no more room */
10888				break;
10889			}
10890		}
10891		asoc->numduptsns = 0;
10892	}
10893	/*
10894	 * now that the chunk is prepared queue it to the control chunk
10895	 * queue.
10896	 */
10897	if (type == SCTP_SELECTIVE_ACK) {
10898		a_chk->send_size = (uint16_t)(sizeof(struct sctp_sack_chunk) +
10899		    (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10900		    num_dups * sizeof(int32_t));
10901		SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10902		sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10903		sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10904		sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10905		sack->sack.num_dup_tsns = htons(num_dups);
10906		sack->ch.chunk_type = type;
10907		sack->ch.chunk_flags = flags;
10908		sack->ch.chunk_length = htons(a_chk->send_size);
10909	} else {
10910		a_chk->send_size = (uint16_t)(sizeof(struct sctp_nr_sack_chunk) +
10911		    (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10912		    num_dups * sizeof(int32_t));
10913		SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10914		nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10915		nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10916		nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10917		nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10918		nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10919		nr_sack->nr_sack.reserved = 0;
10920		nr_sack->ch.chunk_type = type;
10921		nr_sack->ch.chunk_flags = flags;
10922		nr_sack->ch.chunk_length = htons(a_chk->send_size);
10923	}
10924	TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10925	asoc->my_last_reported_rwnd = asoc->my_rwnd;
10926	asoc->ctrl_queue_cnt++;
10927	asoc->send_sack = 0;
10928	SCTP_STAT_INCR(sctps_sendsacks);
10929	return;
10930}
10931
10932void
10933sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked
10934#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10935    SCTP_UNUSED
10936#endif
10937)
10938{
10939	struct mbuf *m_abort, *m, *m_last;
10940	struct mbuf *m_out, *m_end = NULL;
10941	struct sctp_abort_chunk *abort;
10942	struct sctp_auth_chunk *auth = NULL;
10943	struct sctp_nets *net;
10944	uint32_t vtag;
10945	uint32_t auth_offset = 0;
10946	int error;
10947	uint16_t cause_len, chunk_len, padding_len;
10948
10949	SCTP_TCB_LOCK_ASSERT(stcb);
10950	/*-
10951	 * Add an AUTH chunk, if chunk requires it and save the offset into
10952	 * the chain for AUTH
10953	 */
10954	if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10955	    stcb->asoc.peer_auth_chunks)) {
10956		m_out = sctp_add_auth_chunk(NULL, &m_end, &auth, &auth_offset,
10957		    stcb, SCTP_ABORT_ASSOCIATION);
10958		SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10959	} else {
10960		m_out = NULL;
10961	}
10962	m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_NOWAIT, 1, MT_HEADER);
10963	if (m_abort == NULL) {
10964		if (m_out) {
10965			sctp_m_freem(m_out);
10966		}
10967		if (operr) {
10968			sctp_m_freem(operr);
10969		}
10970		return;
10971	}
10972	/* link in any error */
10973	SCTP_BUF_NEXT(m_abort) = operr;
10974	cause_len = 0;
10975	m_last = NULL;
10976	for (m = operr; m; m = SCTP_BUF_NEXT(m)) {
10977		cause_len += (uint16_t)SCTP_BUF_LEN(m);
10978		if (SCTP_BUF_NEXT(m) == NULL) {
10979			m_last = m;
10980		}
10981	}
10982	SCTP_BUF_LEN(m_abort) = sizeof(struct sctp_abort_chunk);
10983	chunk_len = (uint16_t)sizeof(struct sctp_abort_chunk) + cause_len;
10984	padding_len = SCTP_SIZE32(chunk_len) - chunk_len;
10985	if (m_out == NULL) {
10986		/* NO Auth chunk prepended, so reserve space in front */
10987		SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10988		m_out = m_abort;
10989	} else {
10990		/* Put AUTH chunk at the front of the chain */
10991		SCTP_BUF_NEXT(m_end) = m_abort;
10992	}
10993	if (stcb->asoc.alternate) {
10994		net = stcb->asoc.alternate;
10995	} else {
10996		net = stcb->asoc.primary_destination;
10997	}
10998	/* Fill in the ABORT chunk header. */
10999	abort = mtod(m_abort, struct sctp_abort_chunk *);
11000	abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
11001	if (stcb->asoc.peer_vtag == 0) {
11002		/* This happens iff the assoc is in COOKIE-WAIT state. */
11003		vtag = stcb->asoc.my_vtag;
11004		abort->ch.chunk_flags = SCTP_HAD_NO_TCB;
11005	} else {
11006		vtag = stcb->asoc.peer_vtag;
11007		abort->ch.chunk_flags = 0;
11008	}
11009	abort->ch.chunk_length = htons(chunk_len);
11010	/* Add padding, if necessary. */
11011	if (padding_len > 0) {
11012		if ((m_last == NULL) ||
11013		    (sctp_add_pad_tombuf(m_last, padding_len) == NULL)) {
11014			sctp_m_freem(m_out);
11015			return;
11016		}
11017	}
11018	if ((error = sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
11019	    (struct sockaddr *)&net->ro._l_addr,
11020	    m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, 0,
11021	    stcb->sctp_ep->sctp_lport, stcb->rport, htonl(vtag),
11022	    stcb->asoc.primary_destination->port, NULL,
11023	    0, 0,
11024	    so_locked))) {
11025		SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
11026		if (error == ENOBUFS) {
11027			stcb->asoc.ifp_had_enobuf = 1;
11028			SCTP_STAT_INCR(sctps_lowlevelerr);
11029		}
11030	} else {
11031		stcb->asoc.ifp_had_enobuf = 0;
11032	}
11033	SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11034}
11035
11036void
11037sctp_send_shutdown_complete(struct sctp_tcb *stcb,
11038    struct sctp_nets *net,
11039    int reflect_vtag)
11040{
11041	/* formulate and SEND a SHUTDOWN-COMPLETE */
11042	struct mbuf *m_shutdown_comp;
11043	struct sctp_shutdown_complete_chunk *shutdown_complete;
11044	uint32_t vtag;
11045	int error;
11046	uint8_t flags;
11047
11048	m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
11049	if (m_shutdown_comp == NULL) {
11050		/* no mbuf's */
11051		return;
11052	}
11053	if (reflect_vtag) {
11054		flags = SCTP_HAD_NO_TCB;
11055		vtag = stcb->asoc.my_vtag;
11056	} else {
11057		flags = 0;
11058		vtag = stcb->asoc.peer_vtag;
11059	}
11060	shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
11061	shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
11062	shutdown_complete->ch.chunk_flags = flags;
11063	shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
11064	SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
11065	if ((error = sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
11066	    (struct sockaddr *)&net->ro._l_addr,
11067	    m_shutdown_comp, 0, NULL, 0, 1, 0, 0,
11068	    stcb->sctp_ep->sctp_lport, stcb->rport,
11069	    htonl(vtag),
11070	    net->port, NULL,
11071	    0, 0,
11072	    SCTP_SO_NOT_LOCKED))) {
11073		SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
11074		if (error == ENOBUFS) {
11075			stcb->asoc.ifp_had_enobuf = 1;
11076			SCTP_STAT_INCR(sctps_lowlevelerr);
11077		}
11078	} else {
11079		stcb->asoc.ifp_had_enobuf = 0;
11080	}
11081	SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11082	return;
11083}
11084
11085static void
11086sctp_send_resp_msg(struct sockaddr *src, struct sockaddr *dst,
11087    struct sctphdr *sh, uint32_t vtag,
11088    uint8_t type, struct mbuf *cause,
11089    uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
11090    uint32_t vrf_id, uint16_t port)
11091{
11092	struct mbuf *o_pak;
11093	struct mbuf *mout;
11094	struct sctphdr *shout;
11095	struct sctp_chunkhdr *ch;
11096#if defined(INET) || defined(INET6)
11097	struct udphdr *udp;
11098#endif
11099	int ret, len, cause_len, padding_len;
11100#ifdef INET
11101	struct sockaddr_in *src_sin, *dst_sin;
11102	struct ip *ip;
11103#endif
11104#ifdef INET6
11105	struct sockaddr_in6 *src_sin6, *dst_sin6;
11106	struct ip6_hdr *ip6;
11107#endif
11108
11109	/* Compute the length of the cause and add final padding. */
11110	cause_len = 0;
11111	if (cause != NULL) {
11112		struct mbuf *m_at, *m_last = NULL;
11113
11114		for (m_at = cause; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
11115			if (SCTP_BUF_NEXT(m_at) == NULL)
11116				m_last = m_at;
11117			cause_len += SCTP_BUF_LEN(m_at);
11118		}
11119		padding_len = cause_len % 4;
11120		if (padding_len != 0) {
11121			padding_len = 4 - padding_len;
11122		}
11123		if (padding_len != 0) {
11124			if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
11125				sctp_m_freem(cause);
11126				return;
11127			}
11128		}
11129	} else {
11130		padding_len = 0;
11131	}
11132	/* Get an mbuf for the header. */
11133	len = sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
11134	switch (dst->sa_family) {
11135#ifdef INET
11136	case AF_INET:
11137		len += sizeof(struct ip);
11138		break;
11139#endif
11140#ifdef INET6
11141	case AF_INET6:
11142		len += sizeof(struct ip6_hdr);
11143		break;
11144#endif
11145	default:
11146		break;
11147	}
11148#if defined(INET) || defined(INET6)
11149	if (port) {
11150		len += sizeof(struct udphdr);
11151	}
11152#endif
11153	mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_NOWAIT, 1, MT_DATA);
11154	if (mout == NULL) {
11155		if (cause) {
11156			sctp_m_freem(cause);
11157		}
11158		return;
11159	}
11160	SCTP_BUF_RESV_UF(mout, max_linkhdr);
11161	SCTP_BUF_LEN(mout) = len;
11162	SCTP_BUF_NEXT(mout) = cause;
11163	M_SETFIB(mout, fibnum);
11164	mout->m_pkthdr.flowid = mflowid;
11165	M_HASHTYPE_SET(mout, mflowtype);
11166#ifdef INET
11167	ip = NULL;
11168#endif
11169#ifdef INET6
11170	ip6 = NULL;
11171#endif
11172	switch (dst->sa_family) {
11173#ifdef INET
11174	case AF_INET:
11175		src_sin = (struct sockaddr_in *)src;
11176		dst_sin = (struct sockaddr_in *)dst;
11177		ip = mtod(mout, struct ip *);
11178		ip->ip_v = IPVERSION;
11179		ip->ip_hl = (sizeof(struct ip) >> 2);
11180		ip->ip_tos = 0;
11181		ip->ip_off = htons(IP_DF);
11182		ip_fillid(ip);
11183		ip->ip_ttl = MODULE_GLOBAL(ip_defttl);
11184		if (port) {
11185			ip->ip_p = IPPROTO_UDP;
11186		} else {
11187			ip->ip_p = IPPROTO_SCTP;
11188		}
11189		ip->ip_src.s_addr = dst_sin->sin_addr.s_addr;
11190		ip->ip_dst.s_addr = src_sin->sin_addr.s_addr;
11191		ip->ip_sum = 0;
11192		len = sizeof(struct ip);
11193		shout = (struct sctphdr *)((caddr_t)ip + len);
11194		break;
11195#endif
11196#ifdef INET6
11197	case AF_INET6:
11198		src_sin6 = (struct sockaddr_in6 *)src;
11199		dst_sin6 = (struct sockaddr_in6 *)dst;
11200		ip6 = mtod(mout, struct ip6_hdr *);
11201		ip6->ip6_flow = htonl(0x60000000);
11202		if (V_ip6_auto_flowlabel) {
11203			ip6->ip6_flow |= (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
11204		}
11205		ip6->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
11206		if (port) {
11207			ip6->ip6_nxt = IPPROTO_UDP;
11208		} else {
11209			ip6->ip6_nxt = IPPROTO_SCTP;
11210		}
11211		ip6->ip6_src = dst_sin6->sin6_addr;
11212		ip6->ip6_dst = src_sin6->sin6_addr;
11213		len = sizeof(struct ip6_hdr);
11214		shout = (struct sctphdr *)((caddr_t)ip6 + len);
11215		break;
11216#endif
11217	default:
11218		len = 0;
11219		shout = mtod(mout, struct sctphdr *);
11220		break;
11221	}
11222#if defined(INET) || defined(INET6)
11223	if (port) {
11224		if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
11225			sctp_m_freem(mout);
11226			return;
11227		}
11228		udp = (struct udphdr *)shout;
11229		udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
11230		udp->uh_dport = port;
11231		udp->uh_sum = 0;
11232		udp->uh_ulen = htons((uint16_t)(sizeof(struct udphdr) +
11233		    sizeof(struct sctphdr) +
11234		    sizeof(struct sctp_chunkhdr) +
11235		    cause_len + padding_len));
11236		len += sizeof(struct udphdr);
11237		shout = (struct sctphdr *)((caddr_t)shout + sizeof(struct udphdr));
11238	} else {
11239		udp = NULL;
11240	}
11241#endif
11242	shout->src_port = sh->dest_port;
11243	shout->dest_port = sh->src_port;
11244	shout->checksum = 0;
11245	if (vtag) {
11246		shout->v_tag = htonl(vtag);
11247	} else {
11248		shout->v_tag = sh->v_tag;
11249	}
11250	len += sizeof(struct sctphdr);
11251	ch = (struct sctp_chunkhdr *)((caddr_t)shout + sizeof(struct sctphdr));
11252	ch->chunk_type = type;
11253	if (vtag) {
11254		ch->chunk_flags = 0;
11255	} else {
11256		ch->chunk_flags = SCTP_HAD_NO_TCB;
11257	}
11258	ch->chunk_length = htons((uint16_t)(sizeof(struct sctp_chunkhdr) + cause_len));
11259	len += sizeof(struct sctp_chunkhdr);
11260	len += cause_len + padding_len;
11261
11262	if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
11263		sctp_m_freem(mout);
11264		return;
11265	}
11266	SCTP_ATTACH_CHAIN(o_pak, mout, len);
11267	switch (dst->sa_family) {
11268#ifdef INET
11269	case AF_INET:
11270		if (port) {
11271			if (V_udp_cksum) {
11272				udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
11273			} else {
11274				udp->uh_sum = 0;
11275			}
11276		}
11277		ip->ip_len = htons(len);
11278		if (port) {
11279			shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip) + sizeof(struct udphdr));
11280			SCTP_STAT_INCR(sctps_sendswcrc);
11281			if (V_udp_cksum) {
11282				SCTP_ENABLE_UDP_CSUM(o_pak);
11283			}
11284		} else {
11285			mout->m_pkthdr.csum_flags = CSUM_SCTP;
11286			mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11287			SCTP_STAT_INCR(sctps_sendhwcrc);
11288		}
11289#ifdef SCTP_PACKET_LOGGING
11290		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11291			sctp_packet_log(o_pak);
11292		}
11293#endif
11294		SCTP_IP_OUTPUT(ret, o_pak, NULL, NULL, vrf_id);
11295		break;
11296#endif
11297#ifdef INET6
11298	case AF_INET6:
11299		ip6->ip6_plen = htons((uint16_t)(len - sizeof(struct ip6_hdr)));
11300		if (port) {
11301			shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11302			SCTP_STAT_INCR(sctps_sendswcrc);
11303			if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11304				udp->uh_sum = 0xffff;
11305			}
11306		} else {
11307			mout->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
11308			mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11309			SCTP_STAT_INCR(sctps_sendhwcrc);
11310		}
11311#ifdef SCTP_PACKET_LOGGING
11312		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11313			sctp_packet_log(o_pak);
11314		}
11315#endif
11316		SCTP_IP6_OUTPUT(ret, o_pak, NULL, NULL, NULL, vrf_id);
11317		break;
11318#endif
11319	default:
11320		SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
11321		    dst->sa_family);
11322		sctp_m_freem(mout);
11323		SCTP_LTRACE_ERR_RET_PKT(mout, NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11324		return;
11325	}
11326	SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
11327	if (port) {
11328		UDPSTAT_INC(udps_opackets);
11329	}
11330	SCTP_STAT_INCR(sctps_sendpackets);
11331	SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11332	SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11333	if (ret) {
11334		SCTP_STAT_INCR(sctps_senderrors);
11335	}
11336	return;
11337}
11338
11339void
11340sctp_send_shutdown_complete2(struct sockaddr *src, struct sockaddr *dst,
11341    struct sctphdr *sh,
11342    uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
11343    uint32_t vrf_id, uint16_t port)
11344{
11345	sctp_send_resp_msg(src, dst, sh, 0, SCTP_SHUTDOWN_COMPLETE, NULL,
11346	    mflowtype, mflowid, fibnum,
11347	    vrf_id, port);
11348}
11349
11350void
11351sctp_send_hb(struct sctp_tcb *stcb, struct sctp_nets *net, int so_locked
11352#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
11353    SCTP_UNUSED
11354#endif
11355)
11356{
11357	struct sctp_tmit_chunk *chk;
11358	struct sctp_heartbeat_chunk *hb;
11359	struct timeval now;
11360
11361	SCTP_TCB_LOCK_ASSERT(stcb);
11362	if (net == NULL) {
11363		return;
11364	}
11365	(void)SCTP_GETTIME_TIMEVAL(&now);
11366	switch (net->ro._l_addr.sa.sa_family) {
11367#ifdef INET
11368	case AF_INET:
11369		break;
11370#endif
11371#ifdef INET6
11372	case AF_INET6:
11373		break;
11374#endif
11375	default:
11376		return;
11377	}
11378	sctp_alloc_a_chunk(stcb, chk);
11379	if (chk == NULL) {
11380		SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
11381		return;
11382	}
11383
11384	chk->copy_by_ref = 0;
11385	chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
11386	chk->rec.chunk_id.can_take_data = 1;
11387	chk->flags = 0;
11388	chk->asoc = &stcb->asoc;
11389	chk->send_size = sizeof(struct sctp_heartbeat_chunk);
11390
11391	chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11392	if (chk->data == NULL) {
11393		sctp_free_a_chunk(stcb, chk, so_locked);
11394		return;
11395	}
11396	SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11397	SCTP_BUF_LEN(chk->data) = chk->send_size;
11398	chk->sent = SCTP_DATAGRAM_UNSENT;
11399	chk->snd_count = 0;
11400	chk->whoTo = net;
11401	atomic_add_int(&chk->whoTo->ref_count, 1);
11402	/* Now we have a mbuf that we can fill in with the details */
11403	hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
11404	memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
11405	/* fill out chunk header */
11406	hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
11407	hb->ch.chunk_flags = 0;
11408	hb->ch.chunk_length = htons(chk->send_size);
11409	/* Fill out hb parameter */
11410	hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
11411	hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
11412	hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
11413	hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
11414	/* Did our user request this one, put it in */
11415	hb->heartbeat.hb_info.addr_family = (uint8_t)net->ro._l_addr.sa.sa_family;
11416	hb->heartbeat.hb_info.addr_len = net->ro._l_addr.sa.sa_len;
11417	if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
11418		/*
11419		 * we only take from the entropy pool if the address is not
11420		 * confirmed.
11421		 */
11422		net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11423		net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11424	} else {
11425		net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
11426		net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
11427	}
11428	switch (net->ro._l_addr.sa.sa_family) {
11429#ifdef INET
11430	case AF_INET:
11431		memcpy(hb->heartbeat.hb_info.address,
11432		    &net->ro._l_addr.sin.sin_addr,
11433		    sizeof(net->ro._l_addr.sin.sin_addr));
11434		break;
11435#endif
11436#ifdef INET6
11437	case AF_INET6:
11438		memcpy(hb->heartbeat.hb_info.address,
11439		    &net->ro._l_addr.sin6.sin6_addr,
11440		    sizeof(net->ro._l_addr.sin6.sin6_addr));
11441		break;
11442#endif
11443	default:
11444		if (chk->data) {
11445			sctp_m_freem(chk->data);
11446			chk->data = NULL;
11447		}
11448		sctp_free_a_chunk(stcb, chk, so_locked);
11449		return;
11450		break;
11451	}
11452	net->hb_responded = 0;
11453	TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11454	stcb->asoc.ctrl_queue_cnt++;
11455	SCTP_STAT_INCR(sctps_sendheartbeat);
11456	return;
11457}
11458
11459void
11460sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
11461    uint32_t high_tsn)
11462{
11463	struct sctp_association *asoc;
11464	struct sctp_ecne_chunk *ecne;
11465	struct sctp_tmit_chunk *chk;
11466
11467	if (net == NULL) {
11468		return;
11469	}
11470	asoc = &stcb->asoc;
11471	SCTP_TCB_LOCK_ASSERT(stcb);
11472	TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11473		if ((chk->rec.chunk_id.id == SCTP_ECN_ECHO) && (net == chk->whoTo)) {
11474			/* found a previous ECN_ECHO update it if needed */
11475			uint32_t cnt, ctsn;
11476
11477			ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11478			ctsn = ntohl(ecne->tsn);
11479			if (SCTP_TSN_GT(high_tsn, ctsn)) {
11480				ecne->tsn = htonl(high_tsn);
11481				SCTP_STAT_INCR(sctps_queue_upd_ecne);
11482			}
11483			cnt = ntohl(ecne->num_pkts_since_cwr);
11484			cnt++;
11485			ecne->num_pkts_since_cwr = htonl(cnt);
11486			return;
11487		}
11488	}
11489	/* nope could not find one to update so we must build one */
11490	sctp_alloc_a_chunk(stcb, chk);
11491	if (chk == NULL) {
11492		return;
11493	}
11494	SCTP_STAT_INCR(sctps_queue_upd_ecne);
11495	chk->copy_by_ref = 0;
11496	chk->rec.chunk_id.id = SCTP_ECN_ECHO;
11497	chk->rec.chunk_id.can_take_data = 0;
11498	chk->flags = 0;
11499	chk->asoc = &stcb->asoc;
11500	chk->send_size = sizeof(struct sctp_ecne_chunk);
11501	chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11502	if (chk->data == NULL) {
11503		sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11504		return;
11505	}
11506	SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11507	SCTP_BUF_LEN(chk->data) = chk->send_size;
11508	chk->sent = SCTP_DATAGRAM_UNSENT;
11509	chk->snd_count = 0;
11510	chk->whoTo = net;
11511	atomic_add_int(&chk->whoTo->ref_count, 1);
11512
11513	stcb->asoc.ecn_echo_cnt_onq++;
11514	ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11515	ecne->ch.chunk_type = SCTP_ECN_ECHO;
11516	ecne->ch.chunk_flags = 0;
11517	ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
11518	ecne->tsn = htonl(high_tsn);
11519	ecne->num_pkts_since_cwr = htonl(1);
11520	TAILQ_INSERT_HEAD(&stcb->asoc.control_send_queue, chk, sctp_next);
11521	asoc->ctrl_queue_cnt++;
11522}
11523
11524void
11525sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
11526    struct mbuf *m, int len, int iphlen, int bad_crc)
11527{
11528	struct sctp_association *asoc;
11529	struct sctp_pktdrop_chunk *drp;
11530	struct sctp_tmit_chunk *chk;
11531	uint8_t *datap;
11532	int was_trunc = 0;
11533	int fullsz = 0;
11534	long spc;
11535	int offset;
11536	struct sctp_chunkhdr *ch, chunk_buf;
11537	unsigned int chk_length;
11538
11539	if (!stcb) {
11540		return;
11541	}
11542	asoc = &stcb->asoc;
11543	SCTP_TCB_LOCK_ASSERT(stcb);
11544	if (asoc->pktdrop_supported == 0) {
11545		/*-
11546		 * peer must declare support before I send one.
11547		 */
11548		return;
11549	}
11550	if (stcb->sctp_socket == NULL) {
11551		return;
11552	}
11553	sctp_alloc_a_chunk(stcb, chk);
11554	if (chk == NULL) {
11555		return;
11556	}
11557	chk->copy_by_ref = 0;
11558	chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
11559	chk->rec.chunk_id.can_take_data = 1;
11560	chk->flags = 0;
11561	len -= iphlen;
11562	chk->send_size = len;
11563	/* Validate that we do not have an ABORT in here. */
11564	offset = iphlen + sizeof(struct sctphdr);
11565	ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11566	    sizeof(*ch), (uint8_t *)&chunk_buf);
11567	while (ch != NULL) {
11568		chk_length = ntohs(ch->chunk_length);
11569		if (chk_length < sizeof(*ch)) {
11570			/* break to abort land */
11571			break;
11572		}
11573		switch (ch->chunk_type) {
11574		case SCTP_PACKET_DROPPED:
11575		case SCTP_ABORT_ASSOCIATION:
11576		case SCTP_INITIATION_ACK:
11577			/**
11578			 * We don't respond with an PKT-DROP to an ABORT
11579			 * or PKT-DROP. We also do not respond to an
11580			 * INIT-ACK, because we can't know if the initiation
11581			 * tag is correct or not.
11582			 */
11583			sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11584			return;
11585		default:
11586			break;
11587		}
11588		offset += SCTP_SIZE32(chk_length);
11589		ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11590		    sizeof(*ch), (uint8_t *)&chunk_buf);
11591	}
11592
11593	if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
11594	    min(stcb->asoc.smallest_mtu, MCLBYTES)) {
11595		/*
11596		 * only send 1 mtu worth, trim off the excess on the end.
11597		 */
11598		fullsz = len;
11599		len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
11600		was_trunc = 1;
11601	}
11602	chk->asoc = &stcb->asoc;
11603	chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11604	if (chk->data == NULL) {
11605jump_out:
11606		sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11607		return;
11608	}
11609	SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11610	drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
11611	if (drp == NULL) {
11612		sctp_m_freem(chk->data);
11613		chk->data = NULL;
11614		goto jump_out;
11615	}
11616	chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
11617	    sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
11618	chk->book_size_scale = 0;
11619	if (was_trunc) {
11620		drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
11621		drp->trunc_len = htons(fullsz);
11622		/*
11623		 * Len is already adjusted to size minus overhead above take
11624		 * out the pkt_drop chunk itself from it.
11625		 */
11626		chk->send_size = (uint16_t)(len - sizeof(struct sctp_pktdrop_chunk));
11627		len = chk->send_size;
11628	} else {
11629		/* no truncation needed */
11630		drp->ch.chunk_flags = 0;
11631		drp->trunc_len = htons(0);
11632	}
11633	if (bad_crc) {
11634		drp->ch.chunk_flags |= SCTP_BADCRC;
11635	}
11636	chk->send_size += sizeof(struct sctp_pktdrop_chunk);
11637	SCTP_BUF_LEN(chk->data) = chk->send_size;
11638	chk->sent = SCTP_DATAGRAM_UNSENT;
11639	chk->snd_count = 0;
11640	if (net) {
11641		/* we should hit here */
11642		chk->whoTo = net;
11643		atomic_add_int(&chk->whoTo->ref_count, 1);
11644	} else {
11645		chk->whoTo = NULL;
11646	}
11647	drp->ch.chunk_type = SCTP_PACKET_DROPPED;
11648	drp->ch.chunk_length = htons(chk->send_size);
11649	spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
11650	if (spc < 0) {
11651		spc = 0;
11652	}
11653	drp->bottle_bw = htonl(spc);
11654	if (asoc->my_rwnd) {
11655		drp->current_onq = htonl(asoc->size_on_reasm_queue +
11656		    asoc->size_on_all_streams +
11657		    asoc->my_rwnd_control_len +
11658		    stcb->sctp_socket->so_rcv.sb_cc);
11659	} else {
11660		/*-
11661		 * If my rwnd is 0, possibly from mbuf depletion as well as
11662		 * space used, tell the peer there is NO space aka onq == bw
11663		 */
11664		drp->current_onq = htonl(spc);
11665	}
11666	drp->reserved = 0;
11667	datap = drp->data;
11668	m_copydata(m, iphlen, len, (caddr_t)datap);
11669	TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11670	asoc->ctrl_queue_cnt++;
11671}
11672
11673void
11674sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn, uint8_t override)
11675{
11676	struct sctp_association *asoc;
11677	struct sctp_cwr_chunk *cwr;
11678	struct sctp_tmit_chunk *chk;
11679
11680	SCTP_TCB_LOCK_ASSERT(stcb);
11681	if (net == NULL) {
11682		return;
11683	}
11684	asoc = &stcb->asoc;
11685	TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11686		if ((chk->rec.chunk_id.id == SCTP_ECN_CWR) && (net == chk->whoTo)) {
11687			/*
11688			 * found a previous CWR queued to same destination
11689			 * update it if needed
11690			 */
11691			uint32_t ctsn;
11692
11693			cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11694			ctsn = ntohl(cwr->tsn);
11695			if (SCTP_TSN_GT(high_tsn, ctsn)) {
11696				cwr->tsn = htonl(high_tsn);
11697			}
11698			if (override & SCTP_CWR_REDUCE_OVERRIDE) {
11699				/* Make sure override is carried */
11700				cwr->ch.chunk_flags |= SCTP_CWR_REDUCE_OVERRIDE;
11701			}
11702			return;
11703		}
11704	}
11705	sctp_alloc_a_chunk(stcb, chk);
11706	if (chk == NULL) {
11707		return;
11708	}
11709	chk->copy_by_ref = 0;
11710	chk->rec.chunk_id.id = SCTP_ECN_CWR;
11711	chk->rec.chunk_id.can_take_data = 1;
11712	chk->flags = 0;
11713	chk->asoc = &stcb->asoc;
11714	chk->send_size = sizeof(struct sctp_cwr_chunk);
11715	chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11716	if (chk->data == NULL) {
11717		sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11718		return;
11719	}
11720	SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11721	SCTP_BUF_LEN(chk->data) = chk->send_size;
11722	chk->sent = SCTP_DATAGRAM_UNSENT;
11723	chk->snd_count = 0;
11724	chk->whoTo = net;
11725	atomic_add_int(&chk->whoTo->ref_count, 1);
11726	cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11727	cwr->ch.chunk_type = SCTP_ECN_CWR;
11728	cwr->ch.chunk_flags = override;
11729	cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
11730	cwr->tsn = htonl(high_tsn);
11731	TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11732	asoc->ctrl_queue_cnt++;
11733}
11734
11735static int
11736sctp_add_stream_reset_out(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
11737    uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
11738{
11739	uint16_t len, old_len, i;
11740	struct sctp_stream_reset_out_request *req_out;
11741	struct sctp_chunkhdr *ch;
11742	int at;
11743	int number_entries = 0;
11744
11745	ch = mtod(chk->data, struct sctp_chunkhdr *);
11746	old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11747	/* get to new offset for the param. */
11748	req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
11749	/* now how long will this param be? */
11750	for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11751		if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11752		    (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11753		    TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11754			number_entries++;
11755		}
11756	}
11757	if (number_entries == 0) {
11758		return (0);
11759	}
11760	if (number_entries == stcb->asoc.streamoutcnt) {
11761		number_entries = 0;
11762	}
11763	if (number_entries > SCTP_MAX_STREAMS_AT_ONCE_RESET) {
11764		number_entries = SCTP_MAX_STREAMS_AT_ONCE_RESET;
11765	}
11766	len = (uint16_t)(sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
11767	req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
11768	req_out->ph.param_length = htons(len);
11769	req_out->request_seq = htonl(seq);
11770	req_out->response_seq = htonl(resp_seq);
11771	req_out->send_reset_at_tsn = htonl(last_sent);
11772	at = 0;
11773	if (number_entries) {
11774		for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11775			if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11776			    (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11777			    TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11778				req_out->list_of_streams[at] = htons(i);
11779				at++;
11780				stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11781				if (at >= number_entries) {
11782					break;
11783				}
11784			}
11785		}
11786	} else {
11787		for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11788			stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11789		}
11790	}
11791	if (SCTP_SIZE32(len) > len) {
11792		/*-
11793		 * Need to worry about the pad we may end up adding to the
11794		 * end. This is easy since the struct is either aligned to 4
11795		 * bytes or 2 bytes off.
11796		 */
11797		req_out->list_of_streams[number_entries] = 0;
11798	}
11799	/* now fix the chunk length */
11800	ch->chunk_length = htons(len + old_len);
11801	chk->book_size = len + old_len;
11802	chk->book_size_scale = 0;
11803	chk->send_size = SCTP_SIZE32(chk->book_size);
11804	SCTP_BUF_LEN(chk->data) = chk->send_size;
11805	return (1);
11806}
11807
11808static void
11809sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
11810    int number_entries, uint16_t *list,
11811    uint32_t seq)
11812{
11813	uint16_t len, old_len, i;
11814	struct sctp_stream_reset_in_request *req_in;
11815	struct sctp_chunkhdr *ch;
11816
11817	ch = mtod(chk->data, struct sctp_chunkhdr *);
11818	old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11819
11820	/* get to new offset for the param. */
11821	req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
11822	/* now how long will this param be? */
11823	len = (uint16_t)(sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
11824	req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
11825	req_in->ph.param_length = htons(len);
11826	req_in->request_seq = htonl(seq);
11827	if (number_entries) {
11828		for (i = 0; i < number_entries; i++) {
11829			req_in->list_of_streams[i] = htons(list[i]);
11830		}
11831	}
11832	if (SCTP_SIZE32(len) > len) {
11833		/*-
11834		 * Need to worry about the pad we may end up adding to the
11835		 * end. This is easy since the struct is either aligned to 4
11836		 * bytes or 2 bytes off.
11837		 */
11838		req_in->list_of_streams[number_entries] = 0;
11839	}
11840	/* now fix the chunk length */
11841	ch->chunk_length = htons(len + old_len);
11842	chk->book_size = len + old_len;
11843	chk->book_size_scale = 0;
11844	chk->send_size = SCTP_SIZE32(chk->book_size);
11845	SCTP_BUF_LEN(chk->data) = chk->send_size;
11846	return;
11847}
11848
11849static void
11850sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
11851    uint32_t seq)
11852{
11853	uint16_t len, old_len;
11854	struct sctp_stream_reset_tsn_request *req_tsn;
11855	struct sctp_chunkhdr *ch;
11856
11857	ch = mtod(chk->data, struct sctp_chunkhdr *);
11858	old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11859
11860	/* get to new offset for the param. */
11861	req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
11862	/* now how long will this param be? */
11863	len = sizeof(struct sctp_stream_reset_tsn_request);
11864	req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
11865	req_tsn->ph.param_length = htons(len);
11866	req_tsn->request_seq = htonl(seq);
11867
11868	/* now fix the chunk length */
11869	ch->chunk_length = htons(len + old_len);
11870	chk->send_size = len + old_len;
11871	chk->book_size = SCTP_SIZE32(chk->send_size);
11872	chk->book_size_scale = 0;
11873	SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11874	return;
11875}
11876
11877void
11878sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
11879    uint32_t resp_seq, uint32_t result)
11880{
11881	uint16_t len, old_len;
11882	struct sctp_stream_reset_response *resp;
11883	struct sctp_chunkhdr *ch;
11884
11885	ch = mtod(chk->data, struct sctp_chunkhdr *);
11886	old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11887
11888	/* get to new offset for the param. */
11889	resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11890	/* now how long will this param be? */
11891	len = sizeof(struct sctp_stream_reset_response);
11892	resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11893	resp->ph.param_length = htons(len);
11894	resp->response_seq = htonl(resp_seq);
11895	resp->result = ntohl(result);
11896
11897	/* now fix the chunk length */
11898	ch->chunk_length = htons(len + old_len);
11899	chk->book_size = len + old_len;
11900	chk->book_size_scale = 0;
11901	chk->send_size = SCTP_SIZE32(chk->book_size);
11902	SCTP_BUF_LEN(chk->data) = chk->send_size;
11903	return;
11904}
11905
11906void
11907sctp_send_deferred_reset_response(struct sctp_tcb *stcb,
11908    struct sctp_stream_reset_list *ent,
11909    int response)
11910{
11911	struct sctp_association *asoc;
11912	struct sctp_tmit_chunk *chk;
11913	struct sctp_chunkhdr *ch;
11914
11915	asoc = &stcb->asoc;
11916
11917	/*
11918	 * Reset our last reset action to the new one IP -> response
11919	 * (PERFORMED probably). This assures that if we fail to send, a
11920	 * retran from the peer will get the new response.
11921	 */
11922	asoc->last_reset_action[0] = response;
11923	if (asoc->stream_reset_outstanding) {
11924		return;
11925	}
11926	sctp_alloc_a_chunk(stcb, chk);
11927	if (chk == NULL) {
11928		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11929		return;
11930	}
11931	chk->copy_by_ref = 0;
11932	chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11933	chk->rec.chunk_id.can_take_data = 0;
11934	chk->flags = 0;
11935	chk->asoc = &stcb->asoc;
11936	chk->book_size = sizeof(struct sctp_chunkhdr);
11937	chk->send_size = SCTP_SIZE32(chk->book_size);
11938	chk->book_size_scale = 0;
11939	chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11940	if (chk->data == NULL) {
11941		sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
11942		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11943		return;
11944	}
11945	SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11946	/* setup chunk parameters */
11947	chk->sent = SCTP_DATAGRAM_UNSENT;
11948	chk->snd_count = 0;
11949	if (stcb->asoc.alternate) {
11950		chk->whoTo = stcb->asoc.alternate;
11951	} else {
11952		chk->whoTo = stcb->asoc.primary_destination;
11953	}
11954	ch = mtod(chk->data, struct sctp_chunkhdr *);
11955	ch->chunk_type = SCTP_STREAM_RESET;
11956	ch->chunk_flags = 0;
11957	ch->chunk_length = htons(chk->book_size);
11958	atomic_add_int(&chk->whoTo->ref_count, 1);
11959	SCTP_BUF_LEN(chk->data) = chk->send_size;
11960	sctp_add_stream_reset_result(chk, ent->seq, response);
11961	/* insert the chunk for sending */
11962	TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11963	    chk,
11964	    sctp_next);
11965	asoc->ctrl_queue_cnt++;
11966}
11967
11968void
11969sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11970    uint32_t resp_seq, uint32_t result,
11971    uint32_t send_una, uint32_t recv_next)
11972{
11973	uint16_t len, old_len;
11974	struct sctp_stream_reset_response_tsn *resp;
11975	struct sctp_chunkhdr *ch;
11976
11977	ch = mtod(chk->data, struct sctp_chunkhdr *);
11978	old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11979
11980	/* get to new offset for the param. */
11981	resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11982	/* now how long will this param be? */
11983	len = sizeof(struct sctp_stream_reset_response_tsn);
11984	resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11985	resp->ph.param_length = htons(len);
11986	resp->response_seq = htonl(resp_seq);
11987	resp->result = htonl(result);
11988	resp->senders_next_tsn = htonl(send_una);
11989	resp->receivers_next_tsn = htonl(recv_next);
11990
11991	/* now fix the chunk length */
11992	ch->chunk_length = htons(len + old_len);
11993	chk->book_size = len + old_len;
11994	chk->send_size = SCTP_SIZE32(chk->book_size);
11995	chk->book_size_scale = 0;
11996	SCTP_BUF_LEN(chk->data) = chk->send_size;
11997	return;
11998}
11999
12000static void
12001sctp_add_an_out_stream(struct sctp_tmit_chunk *chk,
12002    uint32_t seq,
12003    uint16_t adding)
12004{
12005	uint16_t len, old_len;
12006	struct sctp_chunkhdr *ch;
12007	struct sctp_stream_reset_add_strm *addstr;
12008
12009	ch = mtod(chk->data, struct sctp_chunkhdr *);
12010	old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
12011
12012	/* get to new offset for the param. */
12013	addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
12014	/* now how long will this param be? */
12015	len = sizeof(struct sctp_stream_reset_add_strm);
12016
12017	/* Fill it out. */
12018	addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_OUT_STREAMS);
12019	addstr->ph.param_length = htons(len);
12020	addstr->request_seq = htonl(seq);
12021	addstr->number_of_streams = htons(adding);
12022	addstr->reserved = 0;
12023
12024	/* now fix the chunk length */
12025	ch->chunk_length = htons(len + old_len);
12026	chk->send_size = len + old_len;
12027	chk->book_size = SCTP_SIZE32(chk->send_size);
12028	chk->book_size_scale = 0;
12029	SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
12030	return;
12031}
12032
12033static void
12034sctp_add_an_in_stream(struct sctp_tmit_chunk *chk,
12035    uint32_t seq,
12036    uint16_t adding)
12037{
12038	uint16_t len, old_len;
12039	struct sctp_chunkhdr *ch;
12040	struct sctp_stream_reset_add_strm *addstr;
12041
12042	ch = mtod(chk->data, struct sctp_chunkhdr *);
12043	old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
12044
12045	/* get to new offset for the param. */
12046	addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
12047	/* now how long will this param be? */
12048	len = sizeof(struct sctp_stream_reset_add_strm);
12049	/* Fill it out. */
12050	addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_IN_STREAMS);
12051	addstr->ph.param_length = htons(len);
12052	addstr->request_seq = htonl(seq);
12053	addstr->number_of_streams = htons(adding);
12054	addstr->reserved = 0;
12055
12056	/* now fix the chunk length */
12057	ch->chunk_length = htons(len + old_len);
12058	chk->send_size = len + old_len;
12059	chk->book_size = SCTP_SIZE32(chk->send_size);
12060	chk->book_size_scale = 0;
12061	SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
12062	return;
12063}
12064
12065int
12066sctp_send_stream_reset_out_if_possible(struct sctp_tcb *stcb, int so_locked)
12067{
12068	struct sctp_association *asoc;
12069	struct sctp_tmit_chunk *chk;
12070	struct sctp_chunkhdr *ch;
12071	uint32_t seq;
12072
12073	asoc = &stcb->asoc;
12074	asoc->trigger_reset = 0;
12075	if (asoc->stream_reset_outstanding) {
12076		return (EALREADY);
12077	}
12078	sctp_alloc_a_chunk(stcb, chk);
12079	if (chk == NULL) {
12080		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12081		return (ENOMEM);
12082	}
12083	chk->copy_by_ref = 0;
12084	chk->rec.chunk_id.id = SCTP_STREAM_RESET;
12085	chk->rec.chunk_id.can_take_data = 0;
12086	chk->flags = 0;
12087	chk->asoc = &stcb->asoc;
12088	chk->book_size = sizeof(struct sctp_chunkhdr);
12089	chk->send_size = SCTP_SIZE32(chk->book_size);
12090	chk->book_size_scale = 0;
12091	chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
12092	if (chk->data == NULL) {
12093		sctp_free_a_chunk(stcb, chk, so_locked);
12094		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12095		return (ENOMEM);
12096	}
12097	SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
12098
12099	/* setup chunk parameters */
12100	chk->sent = SCTP_DATAGRAM_UNSENT;
12101	chk->snd_count = 0;
12102	if (stcb->asoc.alternate) {
12103		chk->whoTo = stcb->asoc.alternate;
12104	} else {
12105		chk->whoTo = stcb->asoc.primary_destination;
12106	}
12107	ch = mtod(chk->data, struct sctp_chunkhdr *);
12108	ch->chunk_type = SCTP_STREAM_RESET;
12109	ch->chunk_flags = 0;
12110	ch->chunk_length = htons(chk->book_size);
12111	atomic_add_int(&chk->whoTo->ref_count, 1);
12112	SCTP_BUF_LEN(chk->data) = chk->send_size;
12113	seq = stcb->asoc.str_reset_seq_out;
12114	if (sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1))) {
12115		seq++;
12116		asoc->stream_reset_outstanding++;
12117	} else {
12118		m_freem(chk->data);
12119		chk->data = NULL;
12120		sctp_free_a_chunk(stcb, chk, so_locked);
12121		return (ENOENT);
12122	}
12123	asoc->str_reset = chk;
12124	/* insert the chunk for sending */
12125	TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12126	    chk,
12127	    sctp_next);
12128	asoc->ctrl_queue_cnt++;
12129
12130	if (stcb->asoc.send_sack) {
12131		sctp_send_sack(stcb, so_locked);
12132	}
12133	sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12134	return (0);
12135}
12136
12137int
12138sctp_send_str_reset_req(struct sctp_tcb *stcb,
12139    uint16_t number_entries, uint16_t *list,
12140    uint8_t send_in_req,
12141    uint8_t send_tsn_req,
12142    uint8_t add_stream,
12143    uint16_t adding_o,
12144    uint16_t adding_i, uint8_t peer_asked)
12145{
12146	struct sctp_association *asoc;
12147	struct sctp_tmit_chunk *chk;
12148	struct sctp_chunkhdr *ch;
12149	int can_send_out_req = 0;
12150	uint32_t seq;
12151
12152	asoc = &stcb->asoc;
12153	if (asoc->stream_reset_outstanding) {
12154		/*-
12155		 * Already one pending, must get ACK back to clear the flag.
12156		 */
12157		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
12158		return (EBUSY);
12159	}
12160	if ((send_in_req == 0) && (send_tsn_req == 0) &&
12161	    (add_stream == 0)) {
12162		/* nothing to do */
12163		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12164		return (EINVAL);
12165	}
12166	if (send_tsn_req && send_in_req) {
12167		/* error, can't do that */
12168		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12169		return (EINVAL);
12170	} else if (send_in_req) {
12171		can_send_out_req = 1;
12172	}
12173	if (number_entries > (MCLBYTES -
12174	    SCTP_MIN_OVERHEAD -
12175	    sizeof(struct sctp_chunkhdr) -
12176	    sizeof(struct sctp_stream_reset_out_request)) /
12177	    sizeof(uint16_t)) {
12178		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12179		return (ENOMEM);
12180	}
12181	sctp_alloc_a_chunk(stcb, chk);
12182	if (chk == NULL) {
12183		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12184		return (ENOMEM);
12185	}
12186	chk->copy_by_ref = 0;
12187	chk->rec.chunk_id.id = SCTP_STREAM_RESET;
12188	chk->rec.chunk_id.can_take_data = 0;
12189	chk->flags = 0;
12190	chk->asoc = &stcb->asoc;
12191	chk->book_size = sizeof(struct sctp_chunkhdr);
12192	chk->send_size = SCTP_SIZE32(chk->book_size);
12193	chk->book_size_scale = 0;
12194	chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
12195	if (chk->data == NULL) {
12196		sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
12197		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12198		return (ENOMEM);
12199	}
12200	SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
12201
12202	/* setup chunk parameters */
12203	chk->sent = SCTP_DATAGRAM_UNSENT;
12204	chk->snd_count = 0;
12205	if (stcb->asoc.alternate) {
12206		chk->whoTo = stcb->asoc.alternate;
12207	} else {
12208		chk->whoTo = stcb->asoc.primary_destination;
12209	}
12210	atomic_add_int(&chk->whoTo->ref_count, 1);
12211	ch = mtod(chk->data, struct sctp_chunkhdr *);
12212	ch->chunk_type = SCTP_STREAM_RESET;
12213	ch->chunk_flags = 0;
12214	ch->chunk_length = htons(chk->book_size);
12215	SCTP_BUF_LEN(chk->data) = chk->send_size;
12216
12217	seq = stcb->asoc.str_reset_seq_out;
12218	if (can_send_out_req) {
12219		int ret;
12220
12221		ret = sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1));
12222		if (ret) {
12223			seq++;
12224			asoc->stream_reset_outstanding++;
12225		}
12226	}
12227	if ((add_stream & 1) &&
12228	    ((stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt) < adding_o)) {
12229		/* Need to allocate more */
12230		struct sctp_stream_out *oldstream;
12231		struct sctp_stream_queue_pending *sp, *nsp;
12232		int i;
12233#if defined(SCTP_DETAILED_STR_STATS)
12234		int j;
12235#endif
12236
12237		oldstream = stcb->asoc.strmout;
12238		/* get some more */
12239		SCTP_MALLOC(stcb->asoc.strmout, struct sctp_stream_out *,
12240		    (stcb->asoc.streamoutcnt + adding_o) * sizeof(struct sctp_stream_out),
12241		    SCTP_M_STRMO);
12242		if (stcb->asoc.strmout == NULL) {
12243			uint8_t x;
12244
12245			stcb->asoc.strmout = oldstream;
12246			/* Turn off the bit */
12247			x = add_stream & 0xfe;
12248			add_stream = x;
12249			goto skip_stuff;
12250		}
12251		/*
12252		 * Ok now we proceed with copying the old out stuff and
12253		 * initializing the new stuff.
12254		 */
12255		SCTP_TCB_SEND_LOCK(stcb);
12256		stcb->asoc.ss_functions.sctp_ss_clear(stcb, &stcb->asoc, 0, 1);
12257		for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
12258			TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12259			stcb->asoc.strmout[i].chunks_on_queues = oldstream[i].chunks_on_queues;
12260			stcb->asoc.strmout[i].next_mid_ordered = oldstream[i].next_mid_ordered;
12261			stcb->asoc.strmout[i].next_mid_unordered = oldstream[i].next_mid_unordered;
12262			stcb->asoc.strmout[i].last_msg_incomplete = oldstream[i].last_msg_incomplete;
12263			stcb->asoc.strmout[i].sid = i;
12264			stcb->asoc.strmout[i].state = oldstream[i].state;
12265			/* FIX ME FIX ME */
12266			/*
12267			 * This should be a SS_COPY operation FIX ME STREAM
12268			 * SCHEDULER EXPERT
12269			 */
12270			stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], &oldstream[i]);
12271			/* now anything on those queues? */
12272			TAILQ_FOREACH_SAFE(sp, &oldstream[i].outqueue, next, nsp) {
12273				TAILQ_REMOVE(&oldstream[i].outqueue, sp, next);
12274				TAILQ_INSERT_TAIL(&stcb->asoc.strmout[i].outqueue, sp, next);
12275			}
12276
12277		}
12278		/* now the new streams */
12279		stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 1);
12280		for (i = stcb->asoc.streamoutcnt; i < (stcb->asoc.streamoutcnt + adding_o); i++) {
12281			TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12282			stcb->asoc.strmout[i].chunks_on_queues = 0;
12283#if defined(SCTP_DETAILED_STR_STATS)
12284			for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
12285				stcb->asoc.strmout[i].abandoned_sent[j] = 0;
12286				stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
12287			}
12288#else
12289			stcb->asoc.strmout[i].abandoned_sent[0] = 0;
12290			stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
12291#endif
12292			stcb->asoc.strmout[i].next_mid_ordered = 0;
12293			stcb->asoc.strmout[i].next_mid_unordered = 0;
12294			stcb->asoc.strmout[i].sid = i;
12295			stcb->asoc.strmout[i].last_msg_incomplete = 0;
12296			stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], NULL);
12297			stcb->asoc.strmout[i].state = SCTP_STREAM_CLOSED;
12298		}
12299		stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt + adding_o;
12300		SCTP_FREE(oldstream, SCTP_M_STRMO);
12301		SCTP_TCB_SEND_UNLOCK(stcb);
12302	}
12303skip_stuff:
12304	if ((add_stream & 1) && (adding_o > 0)) {
12305		asoc->strm_pending_add_size = adding_o;
12306		asoc->peer_req_out = peer_asked;
12307		sctp_add_an_out_stream(chk, seq, adding_o);
12308		seq++;
12309		asoc->stream_reset_outstanding++;
12310	}
12311	if ((add_stream & 2) && (adding_i > 0)) {
12312		sctp_add_an_in_stream(chk, seq, adding_i);
12313		seq++;
12314		asoc->stream_reset_outstanding++;
12315	}
12316	if (send_in_req) {
12317		sctp_add_stream_reset_in(chk, number_entries, list, seq);
12318		seq++;
12319		asoc->stream_reset_outstanding++;
12320	}
12321	if (send_tsn_req) {
12322		sctp_add_stream_reset_tsn(chk, seq);
12323		asoc->stream_reset_outstanding++;
12324	}
12325	asoc->str_reset = chk;
12326	/* insert the chunk for sending */
12327	TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12328	    chk,
12329	    sctp_next);
12330	asoc->ctrl_queue_cnt++;
12331	if (stcb->asoc.send_sack) {
12332		sctp_send_sack(stcb, SCTP_SO_LOCKED);
12333	}
12334	sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12335	return (0);
12336}
12337
12338void
12339sctp_send_abort(struct mbuf *m, int iphlen, struct sockaddr *src, struct sockaddr *dst,
12340    struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12341    uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12342    uint32_t vrf_id, uint16_t port)
12343{
12344	/* Don't respond to an ABORT with an ABORT. */
12345	if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
12346		if (cause)
12347			sctp_m_freem(cause);
12348		return;
12349	}
12350	sctp_send_resp_msg(src, dst, sh, vtag, SCTP_ABORT_ASSOCIATION, cause,
12351	    mflowtype, mflowid, fibnum,
12352	    vrf_id, port);
12353	return;
12354}
12355
12356void
12357sctp_send_operr_to(struct sockaddr *src, struct sockaddr *dst,
12358    struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12359    uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12360    uint32_t vrf_id, uint16_t port)
12361{
12362	sctp_send_resp_msg(src, dst, sh, vtag, SCTP_OPERATION_ERROR, cause,
12363	    mflowtype, mflowid, fibnum,
12364	    vrf_id, port);
12365	return;
12366}
12367
12368static struct mbuf *
12369sctp_copy_resume(struct uio *uio,
12370    int max_send_len,
12371    int user_marks_eor,
12372    int *error,
12373    uint32_t *sndout,
12374    struct mbuf **new_tail)
12375{
12376	struct mbuf *m;
12377
12378	m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
12379	    (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
12380	if (m == NULL) {
12381		SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12382		*error = ENOBUFS;
12383	} else {
12384		*sndout = m_length(m, NULL);
12385		*new_tail = m_last(m);
12386	}
12387	return (m);
12388}
12389
12390static int
12391sctp_copy_one(struct sctp_stream_queue_pending *sp,
12392    struct uio *uio,
12393    int resv_upfront)
12394{
12395	sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
12396	    resv_upfront, 0);
12397	if (sp->data == NULL) {
12398		SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12399		return (ENOBUFS);
12400	}
12401
12402	sp->tail_mbuf = m_last(sp->data);
12403	return (0);
12404}
12405
12406
12407
12408static struct sctp_stream_queue_pending *
12409sctp_copy_it_in(struct sctp_tcb *stcb,
12410    struct sctp_association *asoc,
12411    struct sctp_sndrcvinfo *srcv,
12412    struct uio *uio,
12413    struct sctp_nets *net,
12414    ssize_t max_send_len,
12415    int user_marks_eor,
12416    int *error)
12417{
12418
12419	/*-
12420	 * This routine must be very careful in its work. Protocol
12421	 * processing is up and running so care must be taken to spl...()
12422	 * when you need to do something that may effect the stcb/asoc. The
12423	 * sb is locked however. When data is copied the protocol processing
12424	 * should be enabled since this is a slower operation...
12425	 */
12426	struct sctp_stream_queue_pending *sp = NULL;
12427	int resv_in_first;
12428
12429	*error = 0;
12430	/* Now can we send this? */
12431	if ((SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) ||
12432	    (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12433	    (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12434	    (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12435		/* got data while shutting down */
12436		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12437		*error = ECONNRESET;
12438		goto out_now;
12439	}
12440	sctp_alloc_a_strmoq(stcb, sp);
12441	if (sp == NULL) {
12442		SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12443		*error = ENOMEM;
12444		goto out_now;
12445	}
12446	sp->act_flags = 0;
12447	sp->sender_all_done = 0;
12448	sp->sinfo_flags = srcv->sinfo_flags;
12449	sp->timetolive = srcv->sinfo_timetolive;
12450	sp->ppid = srcv->sinfo_ppid;
12451	sp->context = srcv->sinfo_context;
12452	sp->fsn = 0;
12453	(void)SCTP_GETTIME_TIMEVAL(&sp->ts);
12454
12455	sp->sid = srcv->sinfo_stream;
12456	sp->length = (uint32_t)min(uio->uio_resid, max_send_len);
12457	if ((sp->length == (uint32_t)uio->uio_resid) &&
12458	    ((user_marks_eor == 0) ||
12459	    (srcv->sinfo_flags & SCTP_EOF) ||
12460	    (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12461		sp->msg_is_complete = 1;
12462	} else {
12463		sp->msg_is_complete = 0;
12464	}
12465	sp->sender_all_done = 0;
12466	sp->some_taken = 0;
12467	sp->put_last_out = 0;
12468	resv_in_first = SCTP_DATA_CHUNK_OVERHEAD(stcb);
12469	sp->data = sp->tail_mbuf = NULL;
12470	if (sp->length == 0) {
12471		goto skip_copy;
12472	}
12473	if (srcv->sinfo_keynumber_valid) {
12474		sp->auth_keyid = srcv->sinfo_keynumber;
12475	} else {
12476		sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
12477	}
12478	if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
12479		sctp_auth_key_acquire(stcb, sp->auth_keyid);
12480		sp->holds_key_ref = 1;
12481	}
12482	*error = sctp_copy_one(sp, uio, resv_in_first);
12483skip_copy:
12484	if (*error) {
12485		sctp_free_a_strmoq(stcb, sp, SCTP_SO_LOCKED);
12486		sp = NULL;
12487	} else {
12488		if (sp->sinfo_flags & SCTP_ADDR_OVER) {
12489			sp->net = net;
12490			atomic_add_int(&sp->net->ref_count, 1);
12491		} else {
12492			sp->net = NULL;
12493		}
12494		sctp_set_prsctp_policy(sp);
12495	}
12496out_now:
12497	return (sp);
12498}
12499
12500
12501int
12502sctp_sosend(struct socket *so,
12503    struct sockaddr *addr,
12504    struct uio *uio,
12505    struct mbuf *top,
12506    struct mbuf *control,
12507    int flags,
12508    struct thread *p
12509)
12510{
12511	int error, use_sndinfo = 0;
12512	struct sctp_sndrcvinfo sndrcvninfo;
12513	struct sockaddr *addr_to_use;
12514#if defined(INET) && defined(INET6)
12515	struct sockaddr_in sin;
12516#endif
12517
12518	if (control) {
12519		/* process cmsg snd/rcv info (maybe a assoc-id) */
12520		if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&sndrcvninfo, control,
12521		    sizeof(sndrcvninfo))) {
12522			/* got one */
12523			use_sndinfo = 1;
12524		}
12525	}
12526	addr_to_use = addr;
12527#if defined(INET) && defined(INET6)
12528	if ((addr) && (addr->sa_family == AF_INET6)) {
12529		struct sockaddr_in6 *sin6;
12530
12531		sin6 = (struct sockaddr_in6 *)addr;
12532		if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
12533			in6_sin6_2_sin(&sin, sin6);
12534			addr_to_use = (struct sockaddr *)&sin;
12535		}
12536	}
12537#endif
12538	error = sctp_lower_sosend(so, addr_to_use, uio, top,
12539	    control,
12540	    flags,
12541	    use_sndinfo ? &sndrcvninfo : NULL
12542	    ,p
12543	    );
12544	return (error);
12545}
12546
12547
12548int
12549sctp_lower_sosend(struct socket *so,
12550    struct sockaddr *addr,
12551    struct uio *uio,
12552    struct mbuf *i_pak,
12553    struct mbuf *control,
12554    int flags,
12555    struct sctp_sndrcvinfo *srcv
12556    ,
12557    struct thread *p
12558)
12559{
12560	ssize_t sndlen = 0, max_len, local_add_more;
12561	int error, len;
12562	struct mbuf *top = NULL;
12563	int queue_only = 0, queue_only_for_init = 0;
12564	int free_cnt_applied = 0;
12565	int un_sent;
12566	int now_filled = 0;
12567	unsigned int inqueue_bytes = 0;
12568	struct sctp_block_entry be;
12569	struct sctp_inpcb *inp;
12570	struct sctp_tcb *stcb = NULL;
12571	struct timeval now;
12572	struct sctp_nets *net;
12573	struct sctp_association *asoc;
12574	struct sctp_inpcb *t_inp;
12575	int user_marks_eor;
12576	int create_lock_applied = 0;
12577	int nagle_applies = 0;
12578	int some_on_control = 0;
12579	int got_all_of_the_send = 0;
12580	int hold_tcblock = 0;
12581	int non_blocking = 0;
12582	ssize_t local_soresv = 0;
12583	uint16_t port;
12584	uint16_t sinfo_flags;
12585	sctp_assoc_t sinfo_assoc_id;
12586
12587	error = 0;
12588	net = NULL;
12589	stcb = NULL;
12590	asoc = NULL;
12591
12592	t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
12593	if (inp == NULL) {
12594		SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12595		error = EINVAL;
12596		if (i_pak) {
12597			SCTP_RELEASE_PKT(i_pak);
12598		}
12599		return (error);
12600	}
12601	if ((uio == NULL) && (i_pak == NULL)) {
12602		SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12603		return (EINVAL);
12604	}
12605	user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
12606	atomic_add_int(&inp->total_sends, 1);
12607	if (uio) {
12608		if (uio->uio_resid < 0) {
12609			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12610			return (EINVAL);
12611		}
12612		sndlen = uio->uio_resid;
12613	} else {
12614		top = SCTP_HEADER_TO_CHAIN(i_pak);
12615		sndlen = SCTP_HEADER_LEN(i_pak);
12616	}
12617	SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %zd\n",
12618	    (void *)addr,
12619	    sndlen);
12620	if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
12621	    (inp->sctp_socket->so_qlimit)) {
12622		/* The listener can NOT send */
12623		SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12624		error = ENOTCONN;
12625		goto out_unlocked;
12626	}
12627	/**
12628	 * Pre-screen address, if one is given the sin-len
12629	 * must be set correctly!
12630	 */
12631	if (addr) {
12632		union sctp_sockstore *raddr = (union sctp_sockstore *)addr;
12633
12634		switch (raddr->sa.sa_family) {
12635#ifdef INET
12636		case AF_INET:
12637			if (raddr->sin.sin_len != sizeof(struct sockaddr_in)) {
12638				SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12639				error = EINVAL;
12640				goto out_unlocked;
12641			}
12642			port = raddr->sin.sin_port;
12643			break;
12644#endif
12645#ifdef INET6
12646		case AF_INET6:
12647			if (raddr->sin6.sin6_len != sizeof(struct sockaddr_in6)) {
12648				SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12649				error = EINVAL;
12650				goto out_unlocked;
12651			}
12652			port = raddr->sin6.sin6_port;
12653			break;
12654#endif
12655		default:
12656			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAFNOSUPPORT);
12657			error = EAFNOSUPPORT;
12658			goto out_unlocked;
12659		}
12660	} else
12661		port = 0;
12662
12663	if (srcv) {
12664		sinfo_flags = srcv->sinfo_flags;
12665		sinfo_assoc_id = srcv->sinfo_assoc_id;
12666		if (INVALID_SINFO_FLAG(sinfo_flags) ||
12667		    PR_SCTP_INVALID_POLICY(sinfo_flags)) {
12668			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12669			error = EINVAL;
12670			goto out_unlocked;
12671		}
12672		if (srcv->sinfo_flags)
12673			SCTP_STAT_INCR(sctps_sends_with_flags);
12674	} else {
12675		sinfo_flags = inp->def_send.sinfo_flags;
12676		sinfo_assoc_id = inp->def_send.sinfo_assoc_id;
12677	}
12678	if (flags & MSG_EOR) {
12679		sinfo_flags |= SCTP_EOR;
12680	}
12681	if (flags & MSG_EOF) {
12682		sinfo_flags |= SCTP_EOF;
12683	}
12684	if (sinfo_flags & SCTP_SENDALL) {
12685		/* its a sendall */
12686		error = sctp_sendall(inp, uio, top, srcv);
12687		top = NULL;
12688		goto out_unlocked;
12689	}
12690	if ((sinfo_flags & SCTP_ADDR_OVER) && (addr == NULL)) {
12691		SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12692		error = EINVAL;
12693		goto out_unlocked;
12694	}
12695	/* now we must find the assoc */
12696	if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12697	    (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12698		SCTP_INP_RLOCK(inp);
12699		stcb = LIST_FIRST(&inp->sctp_asoc_list);
12700		if (stcb) {
12701			SCTP_TCB_LOCK(stcb);
12702			hold_tcblock = 1;
12703		}
12704		SCTP_INP_RUNLOCK(inp);
12705	} else if (sinfo_assoc_id) {
12706		stcb = sctp_findassociation_ep_asocid(inp, sinfo_assoc_id, 1);
12707		if (stcb != NULL) {
12708			hold_tcblock = 1;
12709		}
12710	} else if (addr) {
12711		/*-
12712		 * Since we did not use findep we must
12713		 * increment it, and if we don't find a tcb
12714		 * decrement it.
12715		 */
12716		SCTP_INP_WLOCK(inp);
12717		SCTP_INP_INCR_REF(inp);
12718		SCTP_INP_WUNLOCK(inp);
12719		stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12720		if (stcb == NULL) {
12721			SCTP_INP_WLOCK(inp);
12722			SCTP_INP_DECR_REF(inp);
12723			SCTP_INP_WUNLOCK(inp);
12724		} else {
12725			hold_tcblock = 1;
12726		}
12727	}
12728	if ((stcb == NULL) && (addr)) {
12729		/* Possible implicit send? */
12730		SCTP_ASOC_CREATE_LOCK(inp);
12731		create_lock_applied = 1;
12732		if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12733		    (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12734			/* Should I really unlock ? */
12735			SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12736			error = EINVAL;
12737			goto out_unlocked;
12738
12739		}
12740		if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12741		    (addr->sa_family == AF_INET6)) {
12742			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12743			error = EINVAL;
12744			goto out_unlocked;
12745		}
12746		SCTP_INP_WLOCK(inp);
12747		SCTP_INP_INCR_REF(inp);
12748		SCTP_INP_WUNLOCK(inp);
12749		/* With the lock applied look again */
12750		stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12751		if ((stcb == NULL) && (control != NULL) && (port > 0)) {
12752			stcb = sctp_findassociation_cmsgs(&t_inp, port, control, &net, &error);
12753		}
12754		if (stcb == NULL) {
12755			SCTP_INP_WLOCK(inp);
12756			SCTP_INP_DECR_REF(inp);
12757			SCTP_INP_WUNLOCK(inp);
12758		} else {
12759			hold_tcblock = 1;
12760		}
12761		if (error) {
12762			goto out_unlocked;
12763		}
12764		if (t_inp != inp) {
12765			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12766			error = ENOTCONN;
12767			goto out_unlocked;
12768		}
12769	}
12770	if (stcb == NULL) {
12771		if (addr == NULL) {
12772			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12773			error = ENOENT;
12774			goto out_unlocked;
12775		} else {
12776			/* We must go ahead and start the INIT process */
12777			uint32_t vrf_id;
12778
12779			if ((sinfo_flags & SCTP_ABORT) ||
12780			    ((sinfo_flags & SCTP_EOF) && (sndlen == 0))) {
12781				/*-
12782				 * User asks to abort a non-existant assoc,
12783				 * or EOF a non-existant assoc with no data
12784				 */
12785				SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12786				error = ENOENT;
12787				goto out_unlocked;
12788			}
12789			/* get an asoc/stcb struct */
12790			vrf_id = inp->def_vrf_id;
12791#ifdef INVARIANTS
12792			if (create_lock_applied == 0) {
12793				panic("Error, should hold create lock and I don't?");
12794			}
12795#endif
12796			stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
12797			    inp->sctp_ep.pre_open_stream_count,
12798			    inp->sctp_ep.port,
12799			    p,
12800			    SCTP_INITIALIZE_AUTH_PARAMS);
12801			if (stcb == NULL) {
12802				/* Error is setup for us in the call */
12803				goto out_unlocked;
12804			}
12805			if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
12806				stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
12807				/*
12808				 * Set the connected flag so we can queue
12809				 * data
12810				 */
12811				soisconnecting(so);
12812			}
12813			hold_tcblock = 1;
12814			if (create_lock_applied) {
12815				SCTP_ASOC_CREATE_UNLOCK(inp);
12816				create_lock_applied = 0;
12817			} else {
12818				SCTP_PRINTF("Huh-3? create lock should have been on??\n");
12819			}
12820			/*
12821			 * Turn on queue only flag to prevent data from
12822			 * being sent
12823			 */
12824			queue_only = 1;
12825			asoc = &stcb->asoc;
12826			SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
12827			(void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
12828
12829			if (control) {
12830				if (sctp_process_cmsgs_for_init(stcb, control, &error)) {
12831					sctp_free_assoc(inp, stcb, SCTP_PCBFREE_FORCE,
12832					    SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_6);
12833					hold_tcblock = 0;
12834					stcb = NULL;
12835					goto out_unlocked;
12836				}
12837			}
12838			/* out with the INIT */
12839			queue_only_for_init = 1;
12840			/*-
12841			 * we may want to dig in after this call and adjust the MTU
12842			 * value. It defaulted to 1500 (constant) but the ro
12843			 * structure may now have an update and thus we may need to
12844			 * change it BEFORE we append the message.
12845			 */
12846		}
12847	} else
12848		asoc = &stcb->asoc;
12849	if (srcv == NULL) {
12850		srcv = (struct sctp_sndrcvinfo *)&asoc->def_send;
12851		sinfo_flags = srcv->sinfo_flags;
12852		if (flags & MSG_EOR) {
12853			sinfo_flags |= SCTP_EOR;
12854		}
12855		if (flags & MSG_EOF) {
12856			sinfo_flags |= SCTP_EOF;
12857		}
12858	}
12859	if (sinfo_flags & SCTP_ADDR_OVER) {
12860		if (addr)
12861			net = sctp_findnet(stcb, addr);
12862		else
12863			net = NULL;
12864		if ((net == NULL) ||
12865		    ((port != 0) && (port != stcb->rport))) {
12866			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12867			error = EINVAL;
12868			goto out_unlocked;
12869		}
12870	} else {
12871		if (stcb->asoc.alternate) {
12872			net = stcb->asoc.alternate;
12873		} else {
12874			net = stcb->asoc.primary_destination;
12875		}
12876	}
12877	atomic_add_int(&stcb->total_sends, 1);
12878	/* Keep the stcb from being freed under our feet */
12879	atomic_add_int(&asoc->refcnt, 1);
12880	free_cnt_applied = 1;
12881
12882	if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12883		if (sndlen > (ssize_t)asoc->smallest_mtu) {
12884			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12885			error = EMSGSIZE;
12886			goto out_unlocked;
12887		}
12888	}
12889	if (SCTP_SO_IS_NBIO(so)
12890	    || (flags & MSG_NBIO)
12891	    ) {
12892		non_blocking = 1;
12893	}
12894	/* would we block? */
12895	if (non_blocking) {
12896		ssize_t amount;
12897
12898		if (hold_tcblock == 0) {
12899			SCTP_TCB_LOCK(stcb);
12900			hold_tcblock = 1;
12901		}
12902		inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
12903		if (user_marks_eor == 0) {
12904			amount = sndlen;
12905		} else {
12906			amount = 1;
12907		}
12908		if ((SCTP_SB_LIMIT_SND(so) < (amount + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
12909		    (stcb->asoc.chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12910			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
12911			if (sndlen > (ssize_t)SCTP_SB_LIMIT_SND(so))
12912				error = EMSGSIZE;
12913			else
12914				error = EWOULDBLOCK;
12915			goto out_unlocked;
12916		}
12917		stcb->asoc.sb_send_resv += (uint32_t)sndlen;
12918		SCTP_TCB_UNLOCK(stcb);
12919		hold_tcblock = 0;
12920	} else {
12921		atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
12922	}
12923	local_soresv = sndlen;
12924	if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12925		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12926		error = ECONNRESET;
12927		goto out_unlocked;
12928	}
12929	if (create_lock_applied) {
12930		SCTP_ASOC_CREATE_UNLOCK(inp);
12931		create_lock_applied = 0;
12932	}
12933	/* Is the stream no. valid? */
12934	if (srcv->sinfo_stream >= asoc->streamoutcnt) {
12935		/* Invalid stream number */
12936		SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12937		error = EINVAL;
12938		goto out_unlocked;
12939	}
12940	if ((asoc->strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPEN) &&
12941	    (asoc->strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPENING)) {
12942		/*
12943		 * Can't queue any data while stream reset is underway.
12944		 */
12945		if (asoc->strmout[srcv->sinfo_stream].state > SCTP_STREAM_OPEN) {
12946			error = EAGAIN;
12947		} else {
12948			error = EINVAL;
12949		}
12950		SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, error);
12951		goto out_unlocked;
12952	}
12953	if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
12954	    (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
12955		queue_only = 1;
12956	}
12957	/* we are now done with all control */
12958	if (control) {
12959		sctp_m_freem(control);
12960		control = NULL;
12961	}
12962	if ((SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) ||
12963	    (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12964	    (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12965	    (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12966		if (sinfo_flags & SCTP_ABORT) {
12967			;
12968		} else {
12969			SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12970			error = ECONNRESET;
12971			goto out_unlocked;
12972		}
12973	}
12974	/* Ok, we will attempt a msgsnd :> */
12975	if (p) {
12976		p->td_ru.ru_msgsnd++;
12977	}
12978	/* Are we aborting? */
12979	if (sinfo_flags & SCTP_ABORT) {
12980		struct mbuf *mm;
12981		ssize_t tot_demand, tot_out = 0, max_out;
12982
12983		SCTP_STAT_INCR(sctps_sends_with_abort);
12984		if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
12985		    (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
12986			/* It has to be up before we abort */
12987			/* how big is the user initiated abort? */
12988			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12989			error = EINVAL;
12990			goto out;
12991		}
12992		if (hold_tcblock) {
12993			SCTP_TCB_UNLOCK(stcb);
12994			hold_tcblock = 0;
12995		}
12996		if (top) {
12997			struct mbuf *cntm = NULL;
12998
12999			mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_WAITOK, 1, MT_DATA);
13000			if (sndlen != 0) {
13001				for (cntm = top; cntm; cntm = SCTP_BUF_NEXT(cntm)) {
13002					tot_out += SCTP_BUF_LEN(cntm);
13003				}
13004			}
13005		} else {
13006			/* Must fit in a MTU */
13007			tot_out = sndlen;
13008			tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
13009			if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
13010				/* To big */
13011				SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
13012				error = EMSGSIZE;
13013				goto out;
13014			}
13015			mm = sctp_get_mbuf_for_msg((unsigned int)tot_demand, 0, M_WAITOK, 1, MT_DATA);
13016		}
13017		if (mm == NULL) {
13018			SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
13019			error = ENOMEM;
13020			goto out;
13021		}
13022		max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
13023		max_out -= sizeof(struct sctp_abort_msg);
13024		if (tot_out > max_out) {
13025			tot_out = max_out;
13026		}
13027		if (mm) {
13028			struct sctp_paramhdr *ph;
13029
13030			/* now move forward the data pointer */
13031			ph = mtod(mm, struct sctp_paramhdr *);
13032			ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
13033			ph->param_length = htons((uint16_t)(sizeof(struct sctp_paramhdr) + tot_out));
13034			ph++;
13035			SCTP_BUF_LEN(mm) = (int)(tot_out + sizeof(struct sctp_paramhdr));
13036			if (top == NULL) {
13037				error = uiomove((caddr_t)ph, (int)tot_out, uio);
13038				if (error) {
13039					/*-
13040					 * Here if we can't get his data we
13041					 * still abort we just don't get to
13042					 * send the users note :-0
13043					 */
13044					sctp_m_freem(mm);
13045					mm = NULL;
13046				}
13047			} else {
13048				if (sndlen != 0) {
13049					SCTP_BUF_NEXT(mm) = top;
13050				}
13051			}
13052		}
13053		if (hold_tcblock == 0) {
13054			SCTP_TCB_LOCK(stcb);
13055		}
13056		atomic_add_int(&stcb->asoc.refcnt, -1);
13057		free_cnt_applied = 0;
13058		/* release this lock, otherwise we hang on ourselves */
13059		sctp_abort_an_association(stcb->sctp_ep, stcb, mm, SCTP_SO_LOCKED);
13060		/* now relock the stcb so everything is sane */
13061		hold_tcblock = 0;
13062		stcb = NULL;
13063		/*
13064		 * In this case top is already chained to mm avoid double
13065		 * free, since we free it below if top != NULL and driver
13066		 * would free it after sending the packet out
13067		 */
13068		if (sndlen != 0) {
13069			top = NULL;
13070		}
13071		goto out_unlocked;
13072	}
13073	/* Calculate the maximum we can send */
13074	inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13075	if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13076		max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13077	} else {
13078		max_len = 0;
13079	}
13080	if (hold_tcblock) {
13081		SCTP_TCB_UNLOCK(stcb);
13082		hold_tcblock = 0;
13083	}
13084	if (asoc->strmout == NULL) {
13085		/* huh? software error */
13086		SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
13087		error = EFAULT;
13088		goto out_unlocked;
13089	}
13090
13091	/* Unless E_EOR mode is on, we must make a send FIT in one call. */
13092	if ((user_marks_eor == 0) &&
13093	    (sndlen > (ssize_t)SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
13094		/* It will NEVER fit */
13095		SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
13096		error = EMSGSIZE;
13097		goto out_unlocked;
13098	}
13099	if ((uio == NULL) && user_marks_eor) {
13100		/*-
13101		 * We do not support eeor mode for
13102		 * sending with mbuf chains (like sendfile).
13103		 */
13104		SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13105		error = EINVAL;
13106		goto out_unlocked;
13107	}
13108
13109	if (user_marks_eor) {
13110		local_add_more = (ssize_t)min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
13111	} else {
13112		/*-
13113		 * For non-eeor the whole message must fit in
13114		 * the socket send buffer.
13115		 */
13116		local_add_more = sndlen;
13117	}
13118	len = 0;
13119	if (non_blocking) {
13120		goto skip_preblock;
13121	}
13122	if (((max_len <= local_add_more) &&
13123	    ((ssize_t)SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
13124	    (max_len == 0) ||
13125	    ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13126		/* No room right now ! */
13127		SOCKBUF_LOCK(&so->so_snd);
13128		inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13129		while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
13130		    ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13131			SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %zd) || (%d+%d > %d)\n",
13132			    (unsigned int)SCTP_SB_LIMIT_SND(so),
13133			    inqueue_bytes,
13134			    local_add_more,
13135			    stcb->asoc.stream_queue_cnt,
13136			    stcb->asoc.chunks_on_out_queue,
13137			    SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
13138			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13139				sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, asoc, sndlen);
13140			}
13141			be.error = 0;
13142			stcb->block_entry = &be;
13143			error = sbwait(&so->so_snd);
13144			stcb->block_entry = NULL;
13145			if (error || so->so_error || be.error) {
13146				if (error == 0) {
13147					if (so->so_error)
13148						error = so->so_error;
13149					if (be.error) {
13150						error = be.error;
13151					}
13152				}
13153				SOCKBUF_UNLOCK(&so->so_snd);
13154				goto out_unlocked;
13155			}
13156			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13157				sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13158				    asoc, stcb->asoc.total_output_queue_size);
13159			}
13160			if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13161				SOCKBUF_UNLOCK(&so->so_snd);
13162				goto out_unlocked;
13163			}
13164			inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13165		}
13166		if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13167			max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13168		} else {
13169			max_len = 0;
13170		}
13171		SOCKBUF_UNLOCK(&so->so_snd);
13172	}
13173
13174skip_preblock:
13175	if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13176		goto out_unlocked;
13177	}
13178	/*
13179	 * sndlen covers for mbuf case uio_resid covers for the non-mbuf
13180	 * case NOTE: uio will be null when top/mbuf is passed
13181	 */
13182	if (sndlen == 0) {
13183		if (sinfo_flags & SCTP_EOF) {
13184			got_all_of_the_send = 1;
13185			goto dataless_eof;
13186		} else {
13187			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13188			error = EINVAL;
13189			goto out;
13190		}
13191	}
13192	if (top == NULL) {
13193		struct sctp_stream_queue_pending *sp;
13194		struct sctp_stream_out *strm;
13195		uint32_t sndout;
13196
13197		SCTP_TCB_SEND_LOCK(stcb);
13198		if ((asoc->stream_locked) &&
13199		    (asoc->stream_locked_on != srcv->sinfo_stream)) {
13200			SCTP_TCB_SEND_UNLOCK(stcb);
13201			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13202			error = EINVAL;
13203			goto out;
13204		}
13205		strm = &stcb->asoc.strmout[srcv->sinfo_stream];
13206		if (strm->last_msg_incomplete == 0) {
13207	do_a_copy_in:
13208			SCTP_TCB_SEND_UNLOCK(stcb);
13209			sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error);
13210			if (error) {
13211				goto out;
13212			}
13213			SCTP_TCB_SEND_LOCK(stcb);
13214			if (sp->msg_is_complete) {
13215				strm->last_msg_incomplete = 0;
13216				asoc->stream_locked = 0;
13217			} else {
13218				/*
13219				 * Just got locked to this guy in case of an
13220				 * interrupt.
13221				 */
13222				strm->last_msg_incomplete = 1;
13223				if (stcb->asoc.idata_supported == 0) {
13224					asoc->stream_locked = 1;
13225					asoc->stream_locked_on = srcv->sinfo_stream;
13226				}
13227				sp->sender_all_done = 0;
13228			}
13229			sctp_snd_sb_alloc(stcb, sp->length);
13230			atomic_add_int(&asoc->stream_queue_cnt, 1);
13231			if (sinfo_flags & SCTP_UNORDERED) {
13232				SCTP_STAT_INCR(sctps_sends_with_unord);
13233			}
13234			sp->processing = 1;
13235			TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
13236			stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, asoc, strm, sp, 1);
13237		} else {
13238			sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
13239			if (sp == NULL) {
13240				/* ???? Huh ??? last msg is gone */
13241#ifdef INVARIANTS
13242				panic("Warning: Last msg marked incomplete, yet nothing left?");
13243#else
13244				SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
13245				strm->last_msg_incomplete = 0;
13246#endif
13247				goto do_a_copy_in;
13248
13249			}
13250			if (sp->processing) {
13251				SCTP_TCB_SEND_UNLOCK(stcb);
13252				SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13253				error = EINVAL;
13254				goto out;
13255			} else {
13256				sp->processing = 1;
13257			}
13258		}
13259		SCTP_TCB_SEND_UNLOCK(stcb);
13260		while (uio->uio_resid > 0) {
13261			/* How much room do we have? */
13262			struct mbuf *new_tail, *mm;
13263
13264			inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13265			if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes)
13266				max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13267			else
13268				max_len = 0;
13269
13270			if ((max_len > (ssize_t)SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
13271			    (max_len && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
13272			    (uio->uio_resid && (uio->uio_resid <= max_len))) {
13273				sndout = 0;
13274				new_tail = NULL;
13275				if (hold_tcblock) {
13276					SCTP_TCB_UNLOCK(stcb);
13277					hold_tcblock = 0;
13278				}
13279				mm = sctp_copy_resume(uio, (int)max_len, user_marks_eor, &error, &sndout, &new_tail);
13280				if ((mm == NULL) || error) {
13281					if (mm) {
13282						sctp_m_freem(mm);
13283					}
13284					SCTP_TCB_SEND_LOCK(stcb);
13285					if (sp != NULL) {
13286						sp->processing = 0;
13287					}
13288					SCTP_TCB_SEND_UNLOCK(stcb);
13289					goto out;
13290				}
13291				/* Update the mbuf and count */
13292				SCTP_TCB_SEND_LOCK(stcb);
13293				if ((stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) ||
13294				    (stcb->asoc.state & SCTP_STATE_WAS_ABORTED)) {
13295					/*
13296					 * we need to get out. Peer probably
13297					 * aborted.
13298					 */
13299					sctp_m_freem(mm);
13300					if (stcb->asoc.state & SCTP_STATE_WAS_ABORTED) {
13301						SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
13302						error = ECONNRESET;
13303					}
13304					if (sp != NULL) {
13305						sp->processing = 0;
13306					}
13307					SCTP_TCB_SEND_UNLOCK(stcb);
13308					goto out;
13309				}
13310				if (sp->tail_mbuf) {
13311					/* tack it to the end */
13312					SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
13313					sp->tail_mbuf = new_tail;
13314				} else {
13315					/* A stolen mbuf */
13316					sp->data = mm;
13317					sp->tail_mbuf = new_tail;
13318				}
13319				sctp_snd_sb_alloc(stcb, sndout);
13320				atomic_add_int(&sp->length, sndout);
13321				len += sndout;
13322				if (sinfo_flags & SCTP_SACK_IMMEDIATELY) {
13323					sp->sinfo_flags |= SCTP_SACK_IMMEDIATELY;
13324				}
13325
13326				/* Did we reach EOR? */
13327				if ((uio->uio_resid == 0) &&
13328				    ((user_marks_eor == 0) ||
13329				    (sinfo_flags & SCTP_EOF) ||
13330				    (user_marks_eor && (sinfo_flags & SCTP_EOR)))) {
13331					sp->msg_is_complete = 1;
13332				} else {
13333					sp->msg_is_complete = 0;
13334				}
13335				SCTP_TCB_SEND_UNLOCK(stcb);
13336			}
13337			if (uio->uio_resid == 0) {
13338				/* got it all? */
13339				continue;
13340			}
13341			/* PR-SCTP? */
13342			if ((asoc->prsctp_supported) && (asoc->sent_queue_cnt_removeable > 0)) {
13343				/*
13344				 * This is ugly but we must assure locking
13345				 * order
13346				 */
13347				if (hold_tcblock == 0) {
13348					SCTP_TCB_LOCK(stcb);
13349					hold_tcblock = 1;
13350				}
13351				sctp_prune_prsctp(stcb, asoc, srcv, (int)sndlen);
13352				inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13353				if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes)
13354					max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13355				else
13356					max_len = 0;
13357				if (max_len > 0) {
13358					continue;
13359				}
13360				SCTP_TCB_UNLOCK(stcb);
13361				hold_tcblock = 0;
13362			}
13363			/* wait for space now */
13364			if (non_blocking) {
13365				/* Non-blocking io in place out */
13366				SCTP_TCB_SEND_LOCK(stcb);
13367				if (sp != NULL) {
13368					sp->processing = 0;
13369				}
13370				SCTP_TCB_SEND_UNLOCK(stcb);
13371				goto skip_out_eof;
13372			}
13373			/* What about the INIT, send it maybe */
13374			if (queue_only_for_init) {
13375				if (hold_tcblock == 0) {
13376					SCTP_TCB_LOCK(stcb);
13377					hold_tcblock = 1;
13378				}
13379				if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
13380					/* a collision took us forward? */
13381					queue_only = 0;
13382				} else {
13383					sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13384					SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
13385					queue_only = 1;
13386				}
13387			}
13388			if ((net->flight_size > net->cwnd) &&
13389			    (asoc->sctp_cmt_on_off == 0)) {
13390				SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13391				queue_only = 1;
13392			} else if (asoc->ifp_had_enobuf) {
13393				SCTP_STAT_INCR(sctps_ifnomemqueued);
13394				if (net->flight_size > (2 * net->mtu)) {
13395					queue_only = 1;
13396				}
13397				asoc->ifp_had_enobuf = 0;
13398			}
13399			un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
13400			if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13401			    (stcb->asoc.total_flight > 0) &&
13402			    (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13403			    (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13404
13405				/*-
13406				 * Ok, Nagle is set on and we have data outstanding.
13407				 * Don't send anything and let SACKs drive out the
13408				 * data unless we have a "full" segment to send.
13409				 */
13410				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13411					sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13412				}
13413				SCTP_STAT_INCR(sctps_naglequeued);
13414				nagle_applies = 1;
13415			} else {
13416				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13417					if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13418						sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13419				}
13420				SCTP_STAT_INCR(sctps_naglesent);
13421				nagle_applies = 0;
13422			}
13423			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13424
13425				sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13426				    nagle_applies, un_sent);
13427				sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13428				    stcb->asoc.total_flight,
13429				    stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13430			}
13431			if (queue_only_for_init)
13432				queue_only_for_init = 0;
13433			if ((queue_only == 0) && (nagle_applies == 0)) {
13434				/*-
13435				 * need to start chunk output
13436				 * before blocking.. note that if
13437				 * a lock is already applied, then
13438				 * the input via the net is happening
13439				 * and I don't need to start output :-D
13440				 */
13441				if (hold_tcblock == 0) {
13442					if (SCTP_TCB_TRYLOCK(stcb)) {
13443						hold_tcblock = 1;
13444						sctp_chunk_output(inp,
13445						    stcb,
13446						    SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13447					}
13448				} else {
13449					sctp_chunk_output(inp,
13450					    stcb,
13451					    SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13452				}
13453			}
13454			if (hold_tcblock == 1) {
13455				SCTP_TCB_UNLOCK(stcb);
13456				hold_tcblock = 0;
13457			}
13458			SOCKBUF_LOCK(&so->so_snd);
13459			/*-
13460			 * This is a bit strange, but I think it will
13461			 * work. The total_output_queue_size is locked and
13462			 * protected by the TCB_LOCK, which we just released.
13463			 * There is a race that can occur between releasing it
13464			 * above, and me getting the socket lock, where sacks
13465			 * come in but we have not put the SB_WAIT on the
13466			 * so_snd buffer to get the wakeup. After the LOCK
13467			 * is applied the sack_processing will also need to
13468			 * LOCK the so->so_snd to do the actual sowwakeup(). So
13469			 * once we have the socket buffer lock if we recheck the
13470			 * size we KNOW we will get to sleep safely with the
13471			 * wakeup flag in place.
13472			 */
13473			inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13474			if (SCTP_SB_LIMIT_SND(so) <= (inqueue_bytes +
13475			    min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
13476				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13477					sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
13478					    asoc, uio->uio_resid);
13479				}
13480				be.error = 0;
13481				stcb->block_entry = &be;
13482				error = sbwait(&so->so_snd);
13483				stcb->block_entry = NULL;
13484
13485				if (error || so->so_error || be.error) {
13486					if (error == 0) {
13487						if (so->so_error)
13488							error = so->so_error;
13489						if (be.error) {
13490							error = be.error;
13491						}
13492					}
13493					SOCKBUF_UNLOCK(&so->so_snd);
13494					SCTP_TCB_SEND_LOCK(stcb);
13495					if (sp != NULL) {
13496						sp->processing = 0;
13497					}
13498					SCTP_TCB_SEND_UNLOCK(stcb);
13499					goto out_unlocked;
13500				}
13501
13502				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13503					sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13504					    asoc, stcb->asoc.total_output_queue_size);
13505				}
13506			}
13507			SOCKBUF_UNLOCK(&so->so_snd);
13508			SCTP_TCB_SEND_LOCK(stcb);
13509			if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13510				if (sp != NULL) {
13511					sp->processing = 0;
13512				}
13513				SCTP_TCB_SEND_UNLOCK(stcb);
13514				goto out_unlocked;
13515			}
13516			SCTP_TCB_SEND_UNLOCK(stcb);
13517		}
13518		SCTP_TCB_SEND_LOCK(stcb);
13519		if ((stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) ||
13520		    (stcb->asoc.state & SCTP_STATE_WAS_ABORTED)) {
13521			SCTP_TCB_SEND_UNLOCK(stcb);
13522			goto out_unlocked;
13523		}
13524		if (sp) {
13525			if (sp->msg_is_complete == 0) {
13526				strm->last_msg_incomplete = 1;
13527				if (stcb->asoc.idata_supported == 0) {
13528					asoc->stream_locked = 1;
13529					asoc->stream_locked_on = srcv->sinfo_stream;
13530				}
13531			} else {
13532				sp->sender_all_done = 1;
13533				strm->last_msg_incomplete = 0;
13534				asoc->stream_locked = 0;
13535			}
13536			sp->processing = 0;
13537		} else {
13538			SCTP_PRINTF("Huh no sp TSNH?\n");
13539			strm->last_msg_incomplete = 0;
13540			asoc->stream_locked = 0;
13541		}
13542		SCTP_TCB_SEND_UNLOCK(stcb);
13543		if (uio->uio_resid == 0) {
13544			got_all_of_the_send = 1;
13545		}
13546	} else {
13547		/* We send in a 0, since we do NOT have any locks */
13548		error = sctp_msg_append(stcb, net, top, srcv, 0);
13549		top = NULL;
13550		if (sinfo_flags & SCTP_EOF) {
13551			/*
13552			 * This should only happen for Panda for the mbuf
13553			 * send case, which does NOT yet support EEOR mode.
13554			 * Thus, we can just set this flag to do the proper
13555			 * EOF handling.
13556			 */
13557			got_all_of_the_send = 1;
13558		}
13559	}
13560	if (error) {
13561		goto out;
13562	}
13563dataless_eof:
13564	/* EOF thing ? */
13565	if ((sinfo_flags & SCTP_EOF) &&
13566	    (got_all_of_the_send == 1)) {
13567		SCTP_STAT_INCR(sctps_sends_with_eof);
13568		error = 0;
13569		if (hold_tcblock == 0) {
13570			SCTP_TCB_LOCK(stcb);
13571			hold_tcblock = 1;
13572		}
13573		if (TAILQ_EMPTY(&asoc->send_queue) &&
13574		    TAILQ_EMPTY(&asoc->sent_queue) &&
13575		    sctp_is_there_unsent_data(stcb, SCTP_SO_LOCKED) == 0) {
13576			if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
13577				goto abort_anyway;
13578			}
13579			/* there is nothing queued to send, so I'm done... */
13580			if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
13581			    (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13582			    (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13583				struct sctp_nets *netp;
13584
13585				/* only send SHUTDOWN the first time through */
13586				if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
13587					SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13588				}
13589				SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_SENT);
13590				SCTP_CLEAR_SUBSTATE(stcb, SCTP_STATE_SHUTDOWN_PENDING);
13591				sctp_stop_timers_for_shutdown(stcb);
13592				if (stcb->asoc.alternate) {
13593					netp = stcb->asoc.alternate;
13594				} else {
13595					netp = stcb->asoc.primary_destination;
13596				}
13597				sctp_send_shutdown(stcb, netp);
13598				sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13599				    netp);
13600				sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13601				    asoc->primary_destination);
13602			}
13603		} else {
13604			/*-
13605			 * we still got (or just got) data to send, so set
13606			 * SHUTDOWN_PENDING
13607			 */
13608			/*-
13609			 * XXX sockets draft says that SCTP_EOF should be
13610			 * sent with no data.  currently, we will allow user
13611			 * data to be sent first and move to
13612			 * SHUTDOWN-PENDING
13613			 */
13614			if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
13615			    (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13616			    (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13617				if (hold_tcblock == 0) {
13618					SCTP_TCB_LOCK(stcb);
13619					hold_tcblock = 1;
13620				}
13621				if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
13622					SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_PARTIAL_MSG_LEFT);
13623				}
13624				SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_SHUTDOWN_PENDING);
13625				if (TAILQ_EMPTY(&asoc->send_queue) &&
13626				    TAILQ_EMPTY(&asoc->sent_queue) &&
13627				    (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13628					struct mbuf *op_err;
13629					char msg[SCTP_DIAG_INFO_LEN];
13630
13631			abort_anyway:
13632					if (free_cnt_applied) {
13633						atomic_add_int(&stcb->asoc.refcnt, -1);
13634						free_cnt_applied = 0;
13635					}
13636					snprintf(msg, sizeof(msg),
13637					    "%s:%d at %s", __FILE__, __LINE__, __func__);
13638					op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
13639					    msg);
13640					sctp_abort_an_association(stcb->sctp_ep, stcb,
13641					    op_err, SCTP_SO_LOCKED);
13642					/*
13643					 * now relock the stcb so everything
13644					 * is sane
13645					 */
13646					hold_tcblock = 0;
13647					stcb = NULL;
13648					goto out;
13649				}
13650				sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13651				    asoc->primary_destination);
13652				sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
13653			}
13654		}
13655	}
13656skip_out_eof:
13657	if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
13658		some_on_control = 1;
13659	}
13660	if (queue_only_for_init) {
13661		if (hold_tcblock == 0) {
13662			SCTP_TCB_LOCK(stcb);
13663			hold_tcblock = 1;
13664		}
13665		if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
13666			/* a collision took us forward? */
13667			queue_only = 0;
13668		} else {
13669			sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13670			SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
13671			queue_only = 1;
13672		}
13673	}
13674	if ((net->flight_size > net->cwnd) &&
13675	    (stcb->asoc.sctp_cmt_on_off == 0)) {
13676		SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13677		queue_only = 1;
13678	} else if (asoc->ifp_had_enobuf) {
13679		SCTP_STAT_INCR(sctps_ifnomemqueued);
13680		if (net->flight_size > (2 * net->mtu)) {
13681			queue_only = 1;
13682		}
13683		asoc->ifp_had_enobuf = 0;
13684	}
13685	un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
13686	if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13687	    (stcb->asoc.total_flight > 0) &&
13688	    (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13689	    (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13690		/*-
13691		 * Ok, Nagle is set on and we have data outstanding.
13692		 * Don't send anything and let SACKs drive out the
13693		 * data unless wen have a "full" segment to send.
13694		 */
13695		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13696			sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13697		}
13698		SCTP_STAT_INCR(sctps_naglequeued);
13699		nagle_applies = 1;
13700	} else {
13701		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13702			if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13703				sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13704		}
13705		SCTP_STAT_INCR(sctps_naglesent);
13706		nagle_applies = 0;
13707	}
13708	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13709		sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13710		    nagle_applies, un_sent);
13711		sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13712		    stcb->asoc.total_flight,
13713		    stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13714	}
13715	if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
13716		/* we can attempt to send too. */
13717		if (hold_tcblock == 0) {
13718			/*
13719			 * If there is activity recv'ing sacks no need to
13720			 * send
13721			 */
13722			if (SCTP_TCB_TRYLOCK(stcb)) {
13723				sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13724				hold_tcblock = 1;
13725			}
13726		} else {
13727			sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13728		}
13729	} else if ((queue_only == 0) &&
13730		    (stcb->asoc.peers_rwnd == 0) &&
13731	    (stcb->asoc.total_flight == 0)) {
13732		/* We get to have a probe outstanding */
13733		if (hold_tcblock == 0) {
13734			hold_tcblock = 1;
13735			SCTP_TCB_LOCK(stcb);
13736		}
13737		sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13738	} else if (some_on_control) {
13739		int num_out, reason, frag_point;
13740
13741		/* Here we do control only */
13742		if (hold_tcblock == 0) {
13743			hold_tcblock = 1;
13744			SCTP_TCB_LOCK(stcb);
13745		}
13746		frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
13747		(void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
13748		    &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
13749	}
13750	SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13751	    queue_only, stcb->asoc.peers_rwnd, un_sent,
13752	    stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
13753	    stcb->asoc.total_output_queue_size, error);
13754
13755out:
13756out_unlocked:
13757
13758	if (local_soresv && stcb) {
13759		atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
13760	}
13761	if (create_lock_applied) {
13762		SCTP_ASOC_CREATE_UNLOCK(inp);
13763	}
13764	if ((stcb) && hold_tcblock) {
13765		SCTP_TCB_UNLOCK(stcb);
13766	}
13767	if (stcb && free_cnt_applied) {
13768		atomic_add_int(&stcb->asoc.refcnt, -1);
13769	}
13770#ifdef INVARIANTS
13771	if (stcb) {
13772		if (mtx_owned(&stcb->tcb_mtx)) {
13773			panic("Leaving with tcb mtx owned?");
13774		}
13775		if (mtx_owned(&stcb->tcb_send_mtx)) {
13776			panic("Leaving with tcb send mtx owned?");
13777		}
13778	}
13779#endif
13780	if (top) {
13781		sctp_m_freem(top);
13782	}
13783	if (control) {
13784		sctp_m_freem(control);
13785	}
13786	return (error);
13787}
13788
13789
13790/*
13791 * generate an AUTHentication chunk, if required
13792 */
13793struct mbuf *
13794sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13795    struct sctp_auth_chunk **auth_ret, uint32_t *offset,
13796    struct sctp_tcb *stcb, uint8_t chunk)
13797{
13798	struct mbuf *m_auth;
13799	struct sctp_auth_chunk *auth;
13800	int chunk_len;
13801	struct mbuf *cn;
13802
13803	if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13804	    (stcb == NULL))
13805		return (m);
13806
13807	if (stcb->asoc.auth_supported == 0) {
13808		return (m);
13809	}
13810	/* does the requested chunk require auth? */
13811	if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13812		return (m);
13813	}
13814	m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_NOWAIT, 1, MT_HEADER);
13815	if (m_auth == NULL) {
13816		/* no mbuf's */
13817		return (m);
13818	}
13819	/* reserve some space if this will be the first mbuf */
13820	if (m == NULL)
13821		SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13822	/* fill in the AUTH chunk details */
13823	auth = mtod(m_auth, struct sctp_auth_chunk *);
13824	memset(auth, 0, sizeof(*auth));
13825	auth->ch.chunk_type = SCTP_AUTHENTICATION;
13826	auth->ch.chunk_flags = 0;
13827	chunk_len = sizeof(*auth) +
13828	    sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13829	auth->ch.chunk_length = htons(chunk_len);
13830	auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13831	/* key id and hmac digest will be computed and filled in upon send */
13832
13833	/* save the offset where the auth was inserted into the chain */
13834	*offset = 0;
13835	for (cn = m; cn; cn = SCTP_BUF_NEXT(cn)) {
13836		*offset += SCTP_BUF_LEN(cn);
13837	}
13838
13839	/* update length and return pointer to the auth chunk */
13840	SCTP_BUF_LEN(m_auth) = chunk_len;
13841	m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13842	if (auth_ret != NULL)
13843		*auth_ret = auth;
13844
13845	return (m);
13846}
13847
13848#ifdef INET6
13849int
13850sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t *ro)
13851{
13852	struct nd_prefix *pfx = NULL;
13853	struct nd_pfxrouter *pfxrtr = NULL;
13854	struct sockaddr_in6 gw6;
13855
13856	if (ro == NULL || ro->ro_rt == NULL || src6->sin6_family != AF_INET6)
13857		return (0);
13858
13859	/* get prefix entry of address */
13860	ND6_RLOCK();
13861	LIST_FOREACH(pfx, &MODULE_GLOBAL(nd_prefix), ndpr_entry) {
13862		if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13863			continue;
13864		if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13865		    &src6->sin6_addr, &pfx->ndpr_mask))
13866			break;
13867	}
13868	/* no prefix entry in the prefix list */
13869	if (pfx == NULL) {
13870		ND6_RUNLOCK();
13871		SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13872		SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13873		return (0);
13874	}
13875
13876	SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13877	SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13878
13879	/* search installed gateway from prefix entry */
13880	LIST_FOREACH(pfxrtr, &pfx->ndpr_advrtrs, pfr_entry) {
13881		memset(&gw6, 0, sizeof(struct sockaddr_in6));
13882		gw6.sin6_family = AF_INET6;
13883		gw6.sin6_len = sizeof(struct sockaddr_in6);
13884		memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13885		    sizeof(struct in6_addr));
13886		SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13887		SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13888		SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13889		SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13890		if (sctp_cmpaddr((struct sockaddr *)&gw6, ro->ro_rt->rt_gateway)) {
13891			ND6_RUNLOCK();
13892			SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13893			ND6_RUNLOCK();
13894			return (1);
13895		}
13896	}
13897	ND6_RUNLOCK();
13898	SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13899	return (0);
13900}
13901#endif
13902
13903int
13904sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t *ro)
13905{
13906#ifdef INET
13907	struct sockaddr_in *sin, *mask;
13908	struct ifaddr *ifa;
13909	struct in_addr srcnetaddr, gwnetaddr;
13910
13911	if (ro == NULL || ro->ro_rt == NULL ||
13912	    sifa->address.sa.sa_family != AF_INET) {
13913		return (0);
13914	}
13915	ifa = (struct ifaddr *)sifa->ifa;
13916	mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13917	sin = &sifa->address.sin;
13918	srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13919	SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13920	SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13921	SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13922
13923	sin = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
13924	gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13925	SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13926	SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13927	SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13928	if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13929		return (1);
13930	}
13931#endif
13932	return (0);
13933}
13934