sctp_output.c revision 331722 
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 331722 2018-03-29 02:50:57Z eadler $");
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	inp->next_addr_touse = starting_point;
2547	resettotop = 0;
2548once_again_too:
2549	if (inp->next_addr_touse == NULL) {
2550		inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2551		resettotop = 1;
2552	}
2553	/* ok, what about an acceptable address in the inp */
2554	for (laddr = inp->next_addr_touse; laddr;
2555	    laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2556		if (laddr->ifa == NULL) {
2557			/* address has been removed */
2558			continue;
2559		}
2560		if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2561			/* address is being deleted */
2562			continue;
2563		}
2564		sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2565		    dest_is_priv, fam);
2566		if (sifa == NULL)
2567			continue;
2568		atomic_add_int(&sifa->refcount, 1);
2569		return (sifa);
2570	}
2571	if (resettotop == 0) {
2572		inp->next_addr_touse = NULL;
2573		goto once_again_too;
2574	}
2575	/*
2576	 * no address bound can be a source for the destination we are in
2577	 * trouble
2578	 */
2579	return (NULL);
2580}
2581
2582
2583
2584static struct sctp_ifa *
2585sctp_choose_boundspecific_stcb(struct sctp_inpcb *inp,
2586    struct sctp_tcb *stcb,
2587    sctp_route_t *ro,
2588    uint32_t vrf_id,
2589    uint8_t dest_is_priv,
2590    uint8_t dest_is_loop,
2591    int non_asoc_addr_ok,
2592    sa_family_t fam)
2593{
2594	struct sctp_laddr *laddr, *starting_point;
2595	void *ifn;
2596	struct sctp_ifn *sctp_ifn;
2597	struct sctp_ifa *sctp_ifa, *sifa;
2598	uint8_t start_at_beginning = 0;
2599	struct sctp_vrf *vrf;
2600	uint32_t ifn_index;
2601
2602	/*
2603	 * first question, is the ifn we will emit on in our list, if so, we
2604	 * want that one.
2605	 */
2606	vrf = sctp_find_vrf(vrf_id);
2607	if (vrf == NULL)
2608		return (NULL);
2609
2610	ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2611	ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2612	sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2613
2614	/*
2615	 * first question, is the ifn we will emit on in our list?  If so,
2616	 * we want that one. First we look for a preferred. Second, we go
2617	 * for an acceptable.
2618	 */
2619	if (sctp_ifn) {
2620		/* first try for a preferred address on the ep */
2621		LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2622#ifdef INET
2623			if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2624			    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2625			    &sctp_ifa->address.sin.sin_addr) != 0)) {
2626				continue;
2627			}
2628#endif
2629#ifdef INET6
2630			if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2631			    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2632			    &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2633				continue;
2634			}
2635#endif
2636			if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2637				continue;
2638			if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2639				sifa = sctp_is_ifa_addr_preferred(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2640				if (sifa == NULL)
2641					continue;
2642				if (((non_asoc_addr_ok == 0) &&
2643				    (sctp_is_addr_restricted(stcb, sifa))) ||
2644				    (non_asoc_addr_ok &&
2645				    (sctp_is_addr_restricted(stcb, sifa)) &&
2646				    (!sctp_is_addr_pending(stcb, sifa)))) {
2647					/* on the no-no list */
2648					continue;
2649				}
2650				atomic_add_int(&sifa->refcount, 1);
2651				return (sifa);
2652			}
2653		}
2654		/* next try for an acceptable address on the ep */
2655		LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2656#ifdef INET
2657			if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2658			    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2659			    &sctp_ifa->address.sin.sin_addr) != 0)) {
2660				continue;
2661			}
2662#endif
2663#ifdef INET6
2664			if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2665			    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2666			    &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2667				continue;
2668			}
2669#endif
2670			if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2671				continue;
2672			if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2673				sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2674				if (sifa == NULL)
2675					continue;
2676				if (((non_asoc_addr_ok == 0) &&
2677				    (sctp_is_addr_restricted(stcb, sifa))) ||
2678				    (non_asoc_addr_ok &&
2679				    (sctp_is_addr_restricted(stcb, sifa)) &&
2680				    (!sctp_is_addr_pending(stcb, sifa)))) {
2681					/* on the no-no list */
2682					continue;
2683				}
2684				atomic_add_int(&sifa->refcount, 1);
2685				return (sifa);
2686			}
2687		}
2688
2689	}
2690	/*
2691	 * if we can't find one like that then we must look at all addresses
2692	 * bound to pick one at first preferable then secondly acceptable.
2693	 */
2694	starting_point = stcb->asoc.last_used_address;
2695sctp_from_the_top:
2696	if (stcb->asoc.last_used_address == NULL) {
2697		start_at_beginning = 1;
2698		stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2699	}
2700	/* search beginning with the last used address */
2701	for (laddr = stcb->asoc.last_used_address; laddr;
2702	    laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2703		if (laddr->ifa == NULL) {
2704			/* address has been removed */
2705			continue;
2706		}
2707		if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2708			/* address is being deleted */
2709			continue;
2710		}
2711		sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop, dest_is_priv, fam);
2712		if (sifa == NULL)
2713			continue;
2714		if (((non_asoc_addr_ok == 0) &&
2715		    (sctp_is_addr_restricted(stcb, sifa))) ||
2716		    (non_asoc_addr_ok &&
2717		    (sctp_is_addr_restricted(stcb, sifa)) &&
2718		    (!sctp_is_addr_pending(stcb, sifa)))) {
2719			/* on the no-no list */
2720			continue;
2721		}
2722		stcb->asoc.last_used_address = laddr;
2723		atomic_add_int(&sifa->refcount, 1);
2724		return (sifa);
2725	}
2726	if (start_at_beginning == 0) {
2727		stcb->asoc.last_used_address = NULL;
2728		goto sctp_from_the_top;
2729	}
2730	/* now try for any higher scope than the destination */
2731	stcb->asoc.last_used_address = starting_point;
2732	start_at_beginning = 0;
2733sctp_from_the_top2:
2734	if (stcb->asoc.last_used_address == NULL) {
2735		start_at_beginning = 1;
2736		stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2737	}
2738	/* search beginning with the last used address */
2739	for (laddr = stcb->asoc.last_used_address; laddr;
2740	    laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2741		if (laddr->ifa == NULL) {
2742			/* address has been removed */
2743			continue;
2744		}
2745		if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2746			/* address is being deleted */
2747			continue;
2748		}
2749		sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2750		    dest_is_priv, fam);
2751		if (sifa == NULL)
2752			continue;
2753		if (((non_asoc_addr_ok == 0) &&
2754		    (sctp_is_addr_restricted(stcb, sifa))) ||
2755		    (non_asoc_addr_ok &&
2756		    (sctp_is_addr_restricted(stcb, sifa)) &&
2757		    (!sctp_is_addr_pending(stcb, sifa)))) {
2758			/* on the no-no list */
2759			continue;
2760		}
2761		stcb->asoc.last_used_address = laddr;
2762		atomic_add_int(&sifa->refcount, 1);
2763		return (sifa);
2764	}
2765	if (start_at_beginning == 0) {
2766		stcb->asoc.last_used_address = NULL;
2767		goto sctp_from_the_top2;
2768	}
2769	return (NULL);
2770}
2771
2772static struct sctp_ifa *
2773sctp_select_nth_preferred_addr_from_ifn_boundall(struct sctp_ifn *ifn,
2774    struct sctp_inpcb *inp,
2775    struct sctp_tcb *stcb,
2776    int non_asoc_addr_ok,
2777    uint8_t dest_is_loop,
2778    uint8_t dest_is_priv,
2779    int addr_wanted,
2780    sa_family_t fam,
2781    sctp_route_t *ro
2782)
2783{
2784	struct sctp_ifa *ifa, *sifa;
2785	int num_eligible_addr = 0;
2786#ifdef INET6
2787	struct sockaddr_in6 sin6, lsa6;
2788
2789	if (fam == AF_INET6) {
2790		memcpy(&sin6, &ro->ro_dst, sizeof(struct sockaddr_in6));
2791		(void)sa6_recoverscope(&sin6);
2792	}
2793#endif				/* INET6 */
2794	LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2795#ifdef INET
2796		if ((ifa->address.sa.sa_family == AF_INET) &&
2797		    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2798		    &ifa->address.sin.sin_addr) != 0)) {
2799			continue;
2800		}
2801#endif
2802#ifdef INET6
2803		if ((ifa->address.sa.sa_family == AF_INET6) &&
2804		    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2805		    &ifa->address.sin6.sin6_addr) != 0)) {
2806			continue;
2807		}
2808#endif
2809		if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2810		    (non_asoc_addr_ok == 0))
2811			continue;
2812		sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2813		    dest_is_priv, fam);
2814		if (sifa == NULL)
2815			continue;
2816#ifdef INET6
2817		if (fam == AF_INET6 &&
2818		    dest_is_loop &&
2819		    sifa->src_is_loop && sifa->src_is_priv) {
2820			/*
2821			 * don't allow fe80::1 to be a src on loop ::1, we
2822			 * don't list it to the peer so we will get an
2823			 * abort.
2824			 */
2825			continue;
2826		}
2827		if (fam == AF_INET6 &&
2828		    IN6_IS_ADDR_LINKLOCAL(&sifa->address.sin6.sin6_addr) &&
2829		    IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr)) {
2830			/*
2831			 * link-local <-> link-local must belong to the same
2832			 * scope.
2833			 */
2834			memcpy(&lsa6, &sifa->address.sin6, sizeof(struct sockaddr_in6));
2835			(void)sa6_recoverscope(&lsa6);
2836			if (sin6.sin6_scope_id != lsa6.sin6_scope_id) {
2837				continue;
2838			}
2839		}
2840#endif				/* INET6 */
2841
2842		/*
2843		 * Check if the IPv6 address matches to next-hop. In the
2844		 * mobile case, old IPv6 address may be not deleted from the
2845		 * interface. Then, the interface has previous and new
2846		 * addresses.  We should use one corresponding to the
2847		 * next-hop.  (by micchie)
2848		 */
2849#ifdef INET6
2850		if (stcb && fam == AF_INET6 &&
2851		    sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2852			if (sctp_v6src_match_nexthop(&sifa->address.sin6, ro)
2853			    == 0) {
2854				continue;
2855			}
2856		}
2857#endif
2858#ifdef INET
2859		/* Avoid topologically incorrect IPv4 address */
2860		if (stcb && fam == AF_INET &&
2861		    sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2862			if (sctp_v4src_match_nexthop(sifa, ro) == 0) {
2863				continue;
2864			}
2865		}
2866#endif
2867		if (stcb) {
2868			if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
2869				continue;
2870			}
2871			if (((non_asoc_addr_ok == 0) &&
2872			    (sctp_is_addr_restricted(stcb, sifa))) ||
2873			    (non_asoc_addr_ok &&
2874			    (sctp_is_addr_restricted(stcb, sifa)) &&
2875			    (!sctp_is_addr_pending(stcb, sifa)))) {
2876				/*
2877				 * It is restricted for some reason..
2878				 * probably not yet added.
2879				 */
2880				continue;
2881			}
2882		}
2883		if (num_eligible_addr >= addr_wanted) {
2884			return (sifa);
2885		}
2886		num_eligible_addr++;
2887	}
2888	return (NULL);
2889}
2890
2891
2892static int
2893sctp_count_num_preferred_boundall(struct sctp_ifn *ifn,
2894    struct sctp_inpcb *inp,
2895    struct sctp_tcb *stcb,
2896    int non_asoc_addr_ok,
2897    uint8_t dest_is_loop,
2898    uint8_t dest_is_priv,
2899    sa_family_t fam)
2900{
2901	struct sctp_ifa *ifa, *sifa;
2902	int num_eligible_addr = 0;
2903
2904	LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2905#ifdef INET
2906		if ((ifa->address.sa.sa_family == AF_INET) &&
2907		    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2908		    &ifa->address.sin.sin_addr) != 0)) {
2909			continue;
2910		}
2911#endif
2912#ifdef INET6
2913		if ((ifa->address.sa.sa_family == AF_INET6) &&
2914		    (stcb != NULL) &&
2915		    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2916		    &ifa->address.sin6.sin6_addr) != 0)) {
2917			continue;
2918		}
2919#endif
2920		if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2921		    (non_asoc_addr_ok == 0)) {
2922			continue;
2923		}
2924		sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2925		    dest_is_priv, fam);
2926		if (sifa == NULL) {
2927			continue;
2928		}
2929		if (stcb) {
2930			if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
2931				continue;
2932			}
2933			if (((non_asoc_addr_ok == 0) &&
2934			    (sctp_is_addr_restricted(stcb, sifa))) ||
2935			    (non_asoc_addr_ok &&
2936			    (sctp_is_addr_restricted(stcb, sifa)) &&
2937			    (!sctp_is_addr_pending(stcb, sifa)))) {
2938				/*
2939				 * It is restricted for some reason..
2940				 * probably not yet added.
2941				 */
2942				continue;
2943			}
2944		}
2945		num_eligible_addr++;
2946	}
2947	return (num_eligible_addr);
2948}
2949
2950static struct sctp_ifa *
2951sctp_choose_boundall(struct sctp_inpcb *inp,
2952    struct sctp_tcb *stcb,
2953    struct sctp_nets *net,
2954    sctp_route_t *ro,
2955    uint32_t vrf_id,
2956    uint8_t dest_is_priv,
2957    uint8_t dest_is_loop,
2958    int non_asoc_addr_ok,
2959    sa_family_t fam)
2960{
2961	int cur_addr_num = 0, num_preferred = 0;
2962	void *ifn;
2963	struct sctp_ifn *sctp_ifn, *looked_at = NULL, *emit_ifn;
2964	struct sctp_ifa *sctp_ifa, *sifa;
2965	uint32_t ifn_index;
2966	struct sctp_vrf *vrf;
2967#ifdef INET
2968	int retried = 0;
2969#endif
2970
2971	/*-
2972	 * For boundall we can use any address in the association.
2973	 * If non_asoc_addr_ok is set we can use any address (at least in
2974	 * theory). So we look for preferred addresses first. If we find one,
2975	 * we use it. Otherwise we next try to get an address on the
2976	 * interface, which we should be able to do (unless non_asoc_addr_ok
2977	 * is false and we are routed out that way). In these cases where we
2978	 * can't use the address of the interface we go through all the
2979	 * ifn's looking for an address we can use and fill that in. Punting
2980	 * means we send back address 0, which will probably cause problems
2981	 * actually since then IP will fill in the address of the route ifn,
2982	 * which means we probably already rejected it.. i.e. here comes an
2983	 * abort :-<.
2984	 */
2985	vrf = sctp_find_vrf(vrf_id);
2986	if (vrf == NULL)
2987		return (NULL);
2988
2989	ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2990	ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2991	SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn from route:%p ifn_index:%d\n", ifn, ifn_index);
2992	emit_ifn = looked_at = sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2993	if (sctp_ifn == NULL) {
2994		/* ?? We don't have this guy ?? */
2995		SCTPDBG(SCTP_DEBUG_OUTPUT2, "No ifn emit interface?\n");
2996		goto bound_all_plan_b;
2997	}
2998	SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn_index:%d name:%s is emit interface\n",
2999	    ifn_index, sctp_ifn->ifn_name);
3000
3001	if (net) {
3002		cur_addr_num = net->indx_of_eligible_next_to_use;
3003	}
3004	num_preferred = sctp_count_num_preferred_boundall(sctp_ifn,
3005	    inp, stcb,
3006	    non_asoc_addr_ok,
3007	    dest_is_loop,
3008	    dest_is_priv, fam);
3009	SCTPDBG(SCTP_DEBUG_OUTPUT2, "Found %d preferred source addresses for intf:%s\n",
3010	    num_preferred, sctp_ifn->ifn_name);
3011	if (num_preferred == 0) {
3012		/*
3013		 * no eligible addresses, we must use some other interface
3014		 * address if we can find one.
3015		 */
3016		goto bound_all_plan_b;
3017	}
3018	/*
3019	 * Ok we have num_eligible_addr set with how many we can use, this
3020	 * may vary from call to call due to addresses being deprecated
3021	 * etc..
3022	 */
3023	if (cur_addr_num >= num_preferred) {
3024		cur_addr_num = 0;
3025	}
3026	/*
3027	 * select the nth address from the list (where cur_addr_num is the
3028	 * nth) and 0 is the first one, 1 is the second one etc...
3029	 */
3030	SCTPDBG(SCTP_DEBUG_OUTPUT2, "cur_addr_num:%d\n", cur_addr_num);
3031
3032	sctp_ifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok, dest_is_loop,
3033	    dest_is_priv, cur_addr_num, fam, ro);
3034
3035	/* if sctp_ifa is NULL something changed??, fall to plan b. */
3036	if (sctp_ifa) {
3037		atomic_add_int(&sctp_ifa->refcount, 1);
3038		if (net) {
3039			/* save off where the next one we will want */
3040			net->indx_of_eligible_next_to_use = cur_addr_num + 1;
3041		}
3042		return (sctp_ifa);
3043	}
3044	/*
3045	 * plan_b: Look at all interfaces and find a preferred address. If
3046	 * no preferred fall through to plan_c.
3047	 */
3048bound_all_plan_b:
3049	SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan B\n");
3050	LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3051		SCTPDBG(SCTP_DEBUG_OUTPUT2, "Examine interface %s\n",
3052		    sctp_ifn->ifn_name);
3053		if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3054			/* wrong base scope */
3055			SCTPDBG(SCTP_DEBUG_OUTPUT2, "skip\n");
3056			continue;
3057		}
3058		if ((sctp_ifn == looked_at) && looked_at) {
3059			/* already looked at this guy */
3060			SCTPDBG(SCTP_DEBUG_OUTPUT2, "already seen\n");
3061			continue;
3062		}
3063		num_preferred = sctp_count_num_preferred_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok,
3064		    dest_is_loop, dest_is_priv, fam);
3065		SCTPDBG(SCTP_DEBUG_OUTPUT2,
3066		    "Found ifn:%p %d preferred source addresses\n",
3067		    ifn, num_preferred);
3068		if (num_preferred == 0) {
3069			/* None on this interface. */
3070			SCTPDBG(SCTP_DEBUG_OUTPUT2, "No preferred -- skipping to next\n");
3071			continue;
3072		}
3073		SCTPDBG(SCTP_DEBUG_OUTPUT2,
3074		    "num preferred:%d on interface:%p cur_addr_num:%d\n",
3075		    num_preferred, (void *)sctp_ifn, cur_addr_num);
3076
3077		/*
3078		 * Ok we have num_eligible_addr set with how many we can
3079		 * use, this may vary from call to call due to addresses
3080		 * being deprecated etc..
3081		 */
3082		if (cur_addr_num >= num_preferred) {
3083			cur_addr_num = 0;
3084		}
3085		sifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok, dest_is_loop,
3086		    dest_is_priv, cur_addr_num, fam, ro);
3087		if (sifa == NULL)
3088			continue;
3089		if (net) {
3090			net->indx_of_eligible_next_to_use = cur_addr_num + 1;
3091			SCTPDBG(SCTP_DEBUG_OUTPUT2, "we selected %d\n",
3092			    cur_addr_num);
3093			SCTPDBG(SCTP_DEBUG_OUTPUT2, "Source:");
3094			SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
3095			SCTPDBG(SCTP_DEBUG_OUTPUT2, "Dest:");
3096			SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &net->ro._l_addr.sa);
3097		}
3098		atomic_add_int(&sifa->refcount, 1);
3099		return (sifa);
3100	}
3101#ifdef INET
3102again_with_private_addresses_allowed:
3103#endif
3104	/* plan_c: do we have an acceptable address on the emit interface */
3105	sifa = NULL;
3106	SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan C: find acceptable on interface\n");
3107	if (emit_ifn == NULL) {
3108		SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jump to Plan D - no emit_ifn\n");
3109		goto plan_d;
3110	}
3111	LIST_FOREACH(sctp_ifa, &emit_ifn->ifalist, next_ifa) {
3112		SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifa:%p\n", (void *)sctp_ifa);
3113#ifdef INET
3114		if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3115		    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3116		    &sctp_ifa->address.sin.sin_addr) != 0)) {
3117			SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jailed\n");
3118			continue;
3119		}
3120#endif
3121#ifdef INET6
3122		if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3123		    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3124		    &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3125			SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jailed\n");
3126			continue;
3127		}
3128#endif
3129		if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3130		    (non_asoc_addr_ok == 0)) {
3131			SCTPDBG(SCTP_DEBUG_OUTPUT2, "Defer\n");
3132			continue;
3133		}
3134		sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop,
3135		    dest_is_priv, fam);
3136		if (sifa == NULL) {
3137			SCTPDBG(SCTP_DEBUG_OUTPUT2, "IFA not acceptable\n");
3138			continue;
3139		}
3140		if (stcb) {
3141			if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
3142				SCTPDBG(SCTP_DEBUG_OUTPUT2, "NOT in scope\n");
3143				sifa = NULL;
3144				continue;
3145			}
3146			if (((non_asoc_addr_ok == 0) &&
3147			    (sctp_is_addr_restricted(stcb, sifa))) ||
3148			    (non_asoc_addr_ok &&
3149			    (sctp_is_addr_restricted(stcb, sifa)) &&
3150			    (!sctp_is_addr_pending(stcb, sifa)))) {
3151				/*
3152				 * It is restricted for some reason..
3153				 * probably not yet added.
3154				 */
3155				SCTPDBG(SCTP_DEBUG_OUTPUT2, "Its restricted\n");
3156				sifa = NULL;
3157				continue;
3158			}
3159		}
3160		atomic_add_int(&sifa->refcount, 1);
3161		goto out;
3162	}
3163plan_d:
3164	/*
3165	 * plan_d: We are in trouble. No preferred address on the emit
3166	 * interface. And not even a preferred address on all interfaces. Go
3167	 * out and see if we can find an acceptable address somewhere
3168	 * amongst all interfaces.
3169	 */
3170	SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan D looked_at is %p\n", (void *)looked_at);
3171	LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3172		if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3173			/* wrong base scope */
3174			continue;
3175		}
3176		LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3177#ifdef INET
3178			if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3179			    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3180			    &sctp_ifa->address.sin.sin_addr) != 0)) {
3181				continue;
3182			}
3183#endif
3184#ifdef INET6
3185			if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3186			    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3187			    &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3188				continue;
3189			}
3190#endif
3191			if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3192			    (non_asoc_addr_ok == 0))
3193				continue;
3194			sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3195			    dest_is_loop,
3196			    dest_is_priv, fam);
3197			if (sifa == NULL)
3198				continue;
3199			if (stcb) {
3200				if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
3201					sifa = NULL;
3202					continue;
3203				}
3204				if (((non_asoc_addr_ok == 0) &&
3205				    (sctp_is_addr_restricted(stcb, sifa))) ||
3206				    (non_asoc_addr_ok &&
3207				    (sctp_is_addr_restricted(stcb, sifa)) &&
3208				    (!sctp_is_addr_pending(stcb, sifa)))) {
3209					/*
3210					 * It is restricted for some
3211					 * reason.. probably not yet added.
3212					 */
3213					sifa = NULL;
3214					continue;
3215				}
3216			}
3217			goto out;
3218		}
3219	}
3220#ifdef INET
3221	if (stcb) {
3222		if ((retried == 0) && (stcb->asoc.scope.ipv4_local_scope == 0)) {
3223			stcb->asoc.scope.ipv4_local_scope = 1;
3224			retried = 1;
3225			goto again_with_private_addresses_allowed;
3226		} else if (retried == 1) {
3227			stcb->asoc.scope.ipv4_local_scope = 0;
3228		}
3229	}
3230#endif
3231out:
3232#ifdef INET
3233	if (sifa) {
3234		if (retried == 1) {
3235			LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3236				if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3237					/* wrong base scope */
3238					continue;
3239				}
3240				LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3241					struct sctp_ifa *tmp_sifa;
3242
3243#ifdef INET
3244					if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3245					    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3246					    &sctp_ifa->address.sin.sin_addr) != 0)) {
3247						continue;
3248					}
3249#endif
3250#ifdef INET6
3251					if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3252					    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3253					    &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3254						continue;
3255					}
3256#endif
3257					if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3258					    (non_asoc_addr_ok == 0))
3259						continue;
3260					tmp_sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3261					    dest_is_loop,
3262					    dest_is_priv, fam);
3263					if (tmp_sifa == NULL) {
3264						continue;
3265					}
3266					if (tmp_sifa == sifa) {
3267						continue;
3268					}
3269					if (stcb) {
3270						if (sctp_is_address_in_scope(tmp_sifa,
3271						    &stcb->asoc.scope, 0) == 0) {
3272							continue;
3273						}
3274						if (((non_asoc_addr_ok == 0) &&
3275						    (sctp_is_addr_restricted(stcb, tmp_sifa))) ||
3276						    (non_asoc_addr_ok &&
3277						    (sctp_is_addr_restricted(stcb, tmp_sifa)) &&
3278						    (!sctp_is_addr_pending(stcb, tmp_sifa)))) {
3279							/*
3280							 * It is restricted
3281							 * for some reason..
3282							 * probably not yet
3283							 * added.
3284							 */
3285							continue;
3286						}
3287					}
3288					if ((tmp_sifa->address.sin.sin_family == AF_INET) &&
3289					    (IN4_ISPRIVATE_ADDRESS(&(tmp_sifa->address.sin.sin_addr)))) {
3290						sctp_add_local_addr_restricted(stcb, tmp_sifa);
3291					}
3292				}
3293			}
3294		}
3295		atomic_add_int(&sifa->refcount, 1);
3296	}
3297#endif
3298	return (sifa);
3299}
3300
3301
3302
3303/* tcb may be NULL */
3304struct sctp_ifa *
3305sctp_source_address_selection(struct sctp_inpcb *inp,
3306    struct sctp_tcb *stcb,
3307    sctp_route_t *ro,
3308    struct sctp_nets *net,
3309    int non_asoc_addr_ok, uint32_t vrf_id)
3310{
3311	struct sctp_ifa *answer;
3312	uint8_t dest_is_priv, dest_is_loop;
3313	sa_family_t fam;
3314#ifdef INET
3315	struct sockaddr_in *to = (struct sockaddr_in *)&ro->ro_dst;
3316#endif
3317#ifdef INET6
3318	struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&ro->ro_dst;
3319#endif
3320
3321	/**
3322	 * Rules:
3323	 * - Find the route if needed, cache if I can.
3324	 * - Look at interface address in route, Is it in the bound list. If so we
3325	 *   have the best source.
3326	 * - If not we must rotate amongst the addresses.
3327	 *
3328	 * Cavets and issues
3329	 *
3330	 * Do we need to pay attention to scope. We can have a private address
3331	 * or a global address we are sourcing or sending to. So if we draw
3332	 * it out
3333	 * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3334	 * For V4
3335	 * ------------------------------------------
3336	 *      source     *      dest  *  result
3337	 * -----------------------------------------
3338	 * <a>  Private    *    Global  *  NAT
3339	 * -----------------------------------------
3340	 * <b>  Private    *    Private *  No problem
3341	 * -----------------------------------------
3342	 * <c>  Global     *    Private *  Huh, How will this work?
3343	 * -----------------------------------------
3344	 * <d>  Global     *    Global  *  No Problem
3345	 *------------------------------------------
3346	 * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3347	 * For V6
3348	 *------------------------------------------
3349	 *      source     *      dest  *  result
3350	 * -----------------------------------------
3351	 * <a>  Linklocal  *    Global  *
3352	 * -----------------------------------------
3353	 * <b>  Linklocal  * Linklocal  *  No problem
3354	 * -----------------------------------------
3355	 * <c>  Global     * Linklocal  *  Huh, How will this work?
3356	 * -----------------------------------------
3357	 * <d>  Global     *    Global  *  No Problem
3358	 *------------------------------------------
3359	 * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3360	 *
3361	 * And then we add to that what happens if there are multiple addresses
3362	 * assigned to an interface. Remember the ifa on a ifn is a linked
3363	 * list of addresses. So one interface can have more than one IP
3364	 * address. What happens if we have both a private and a global
3365	 * address? Do we then use context of destination to sort out which
3366	 * one is best? And what about NAT's sending P->G may get you a NAT
3367	 * translation, or should you select the G thats on the interface in
3368	 * preference.
3369	 *
3370	 * Decisions:
3371	 *
3372	 * - count the number of addresses on the interface.
3373	 * - if it is one, no problem except case <c>.
3374	 *   For <a> we will assume a NAT out there.
3375	 * - if there are more than one, then we need to worry about scope P
3376	 *   or G. We should prefer G -> G and P -> P if possible.
3377	 *   Then as a secondary fall back to mixed types G->P being a last
3378	 *   ditch one.
3379	 * - The above all works for bound all, but bound specific we need to
3380	 *   use the same concept but instead only consider the bound
3381	 *   addresses. If the bound set is NOT assigned to the interface then
3382	 *   we must use rotation amongst the bound addresses..
3383	 */
3384	if (ro->ro_rt == NULL) {
3385		/*
3386		 * Need a route to cache.
3387		 */
3388		SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
3389	}
3390	if (ro->ro_rt == NULL) {
3391		return (NULL);
3392	}
3393	fam = ro->ro_dst.sa_family;
3394	dest_is_priv = dest_is_loop = 0;
3395	/* Setup our scopes for the destination */
3396	switch (fam) {
3397#ifdef INET
3398	case AF_INET:
3399		/* Scope based on outbound address */
3400		if (IN4_ISLOOPBACK_ADDRESS(&to->sin_addr)) {
3401			dest_is_loop = 1;
3402			if (net != NULL) {
3403				/* mark it as local */
3404				net->addr_is_local = 1;
3405			}
3406		} else if ((IN4_ISPRIVATE_ADDRESS(&to->sin_addr))) {
3407			dest_is_priv = 1;
3408		}
3409		break;
3410#endif
3411#ifdef INET6
3412	case AF_INET6:
3413		/* Scope based on outbound address */
3414		if (IN6_IS_ADDR_LOOPBACK(&to6->sin6_addr) ||
3415		    SCTP_ROUTE_IS_REAL_LOOP(ro)) {
3416			/*
3417			 * If the address is a loopback address, which
3418			 * consists of "::1" OR "fe80::1%lo0", we are
3419			 * loopback scope. But we don't use dest_is_priv
3420			 * (link local addresses).
3421			 */
3422			dest_is_loop = 1;
3423			if (net != NULL) {
3424				/* mark it as local */
3425				net->addr_is_local = 1;
3426			}
3427		} else if (IN6_IS_ADDR_LINKLOCAL(&to6->sin6_addr)) {
3428			dest_is_priv = 1;
3429		}
3430		break;
3431#endif
3432	}
3433	SCTPDBG(SCTP_DEBUG_OUTPUT2, "Select source addr for:");
3434	SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&ro->ro_dst);
3435	SCTP_IPI_ADDR_RLOCK();
3436	if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
3437		/*
3438		 * Bound all case
3439		 */
3440		answer = sctp_choose_boundall(inp, stcb, net, ro, vrf_id,
3441		    dest_is_priv, dest_is_loop,
3442		    non_asoc_addr_ok, fam);
3443		SCTP_IPI_ADDR_RUNLOCK();
3444		return (answer);
3445	}
3446	/*
3447	 * Subset bound case
3448	 */
3449	if (stcb) {
3450		answer = sctp_choose_boundspecific_stcb(inp, stcb, ro,
3451		    vrf_id, dest_is_priv,
3452		    dest_is_loop,
3453		    non_asoc_addr_ok, fam);
3454	} else {
3455		answer = sctp_choose_boundspecific_inp(inp, ro, vrf_id,
3456		    non_asoc_addr_ok,
3457		    dest_is_priv,
3458		    dest_is_loop, fam);
3459	}
3460	SCTP_IPI_ADDR_RUNLOCK();
3461	return (answer);
3462}
3463
3464static int
3465sctp_find_cmsg(int c_type, void *data, struct mbuf *control, size_t cpsize)
3466{
3467	struct cmsghdr cmh;
3468	int tlen, at, found;
3469	struct sctp_sndinfo sndinfo;
3470	struct sctp_prinfo prinfo;
3471	struct sctp_authinfo authinfo;
3472
3473	tlen = SCTP_BUF_LEN(control);
3474	at = 0;
3475	found = 0;
3476	/*
3477	 * Independent of how many mbufs, find the c_type inside the control
3478	 * structure and copy out the data.
3479	 */
3480	while (at < tlen) {
3481		if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3482			/* There is not enough room for one more. */
3483			return (found);
3484		}
3485		m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3486		if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3487			/* We dont't have a complete CMSG header. */
3488			return (found);
3489		}
3490		if (((int)cmh.cmsg_len + at) > tlen) {
3491			/* We don't have the complete CMSG. */
3492			return (found);
3493		}
3494		if ((cmh.cmsg_level == IPPROTO_SCTP) &&
3495		    ((c_type == cmh.cmsg_type) ||
3496		    ((c_type == SCTP_SNDRCV) &&
3497		    ((cmh.cmsg_type == SCTP_SNDINFO) ||
3498		    (cmh.cmsg_type == SCTP_PRINFO) ||
3499		    (cmh.cmsg_type == SCTP_AUTHINFO))))) {
3500			if (c_type == cmh.cmsg_type) {
3501				if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < cpsize) {
3502					return (found);
3503				}
3504				/* It is exactly what we want. Copy it out. */
3505				m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), (int)cpsize, (caddr_t)data);
3506				return (1);
3507			} else {
3508				struct sctp_sndrcvinfo *sndrcvinfo;
3509
3510				sndrcvinfo = (struct sctp_sndrcvinfo *)data;
3511				if (found == 0) {
3512					if (cpsize < sizeof(struct sctp_sndrcvinfo)) {
3513						return (found);
3514					}
3515					memset(sndrcvinfo, 0, sizeof(struct sctp_sndrcvinfo));
3516				}
3517				switch (cmh.cmsg_type) {
3518				case SCTP_SNDINFO:
3519					if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_sndinfo)) {
3520						return (found);
3521					}
3522					m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_sndinfo), (caddr_t)&sndinfo);
3523					sndrcvinfo->sinfo_stream = sndinfo.snd_sid;
3524					sndrcvinfo->sinfo_flags = sndinfo.snd_flags;
3525					sndrcvinfo->sinfo_ppid = sndinfo.snd_ppid;
3526					sndrcvinfo->sinfo_context = sndinfo.snd_context;
3527					sndrcvinfo->sinfo_assoc_id = sndinfo.snd_assoc_id;
3528					break;
3529				case SCTP_PRINFO:
3530					if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_prinfo)) {
3531						return (found);
3532					}
3533					m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_prinfo), (caddr_t)&prinfo);
3534					if (prinfo.pr_policy != SCTP_PR_SCTP_NONE) {
3535						sndrcvinfo->sinfo_timetolive = prinfo.pr_value;
3536					} else {
3537						sndrcvinfo->sinfo_timetolive = 0;
3538					}
3539					sndrcvinfo->sinfo_flags |= prinfo.pr_policy;
3540					break;
3541				case SCTP_AUTHINFO:
3542					if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_authinfo)) {
3543						return (found);
3544					}
3545					m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_authinfo), (caddr_t)&authinfo);
3546					sndrcvinfo->sinfo_keynumber_valid = 1;
3547					sndrcvinfo->sinfo_keynumber = authinfo.auth_keynumber;
3548					break;
3549				default:
3550					return (found);
3551				}
3552				found = 1;
3553			}
3554		}
3555		at += CMSG_ALIGN(cmh.cmsg_len);
3556	}
3557	return (found);
3558}
3559
3560static int
3561sctp_process_cmsgs_for_init(struct sctp_tcb *stcb, struct mbuf *control, int *error)
3562{
3563	struct cmsghdr cmh;
3564	int tlen, at;
3565	struct sctp_initmsg initmsg;
3566#ifdef INET
3567	struct sockaddr_in sin;
3568#endif
3569#ifdef INET6
3570	struct sockaddr_in6 sin6;
3571#endif
3572
3573	tlen = SCTP_BUF_LEN(control);
3574	at = 0;
3575	while (at < tlen) {
3576		if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3577			/* There is not enough room for one more. */
3578			*error = EINVAL;
3579			return (1);
3580		}
3581		m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3582		if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3583			/* We dont't have a complete CMSG header. */
3584			*error = EINVAL;
3585			return (1);
3586		}
3587		if (((int)cmh.cmsg_len + at) > tlen) {
3588			/* We don't have the complete CMSG. */
3589			*error = EINVAL;
3590			return (1);
3591		}
3592		if (cmh.cmsg_level == IPPROTO_SCTP) {
3593			switch (cmh.cmsg_type) {
3594			case SCTP_INIT:
3595				if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_initmsg)) {
3596					*error = EINVAL;
3597					return (1);
3598				}
3599				m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_initmsg), (caddr_t)&initmsg);
3600				if (initmsg.sinit_max_attempts)
3601					stcb->asoc.max_init_times = initmsg.sinit_max_attempts;
3602				if (initmsg.sinit_num_ostreams)
3603					stcb->asoc.pre_open_streams = initmsg.sinit_num_ostreams;
3604				if (initmsg.sinit_max_instreams)
3605					stcb->asoc.max_inbound_streams = initmsg.sinit_max_instreams;
3606				if (initmsg.sinit_max_init_timeo)
3607					stcb->asoc.initial_init_rto_max = initmsg.sinit_max_init_timeo;
3608				if (stcb->asoc.streamoutcnt < stcb->asoc.pre_open_streams) {
3609					struct sctp_stream_out *tmp_str;
3610					unsigned int i;
3611#if defined(SCTP_DETAILED_STR_STATS)
3612					int j;
3613#endif
3614
3615					/* Default is NOT correct */
3616					SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, default:%d pre_open:%d\n",
3617					    stcb->asoc.streamoutcnt, stcb->asoc.pre_open_streams);
3618					SCTP_TCB_UNLOCK(stcb);
3619					SCTP_MALLOC(tmp_str,
3620					    struct sctp_stream_out *,
3621					    (stcb->asoc.pre_open_streams * sizeof(struct sctp_stream_out)),
3622					    SCTP_M_STRMO);
3623					SCTP_TCB_LOCK(stcb);
3624					if (tmp_str != NULL) {
3625						SCTP_FREE(stcb->asoc.strmout, SCTP_M_STRMO);
3626						stcb->asoc.strmout = tmp_str;
3627						stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt = stcb->asoc.pre_open_streams;
3628					} else {
3629						stcb->asoc.pre_open_streams = stcb->asoc.streamoutcnt;
3630					}
3631					for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3632						TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
3633						stcb->asoc.strmout[i].chunks_on_queues = 0;
3634						stcb->asoc.strmout[i].next_mid_ordered = 0;
3635						stcb->asoc.strmout[i].next_mid_unordered = 0;
3636#if defined(SCTP_DETAILED_STR_STATS)
3637						for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
3638							stcb->asoc.strmout[i].abandoned_sent[j] = 0;
3639							stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
3640						}
3641#else
3642						stcb->asoc.strmout[i].abandoned_sent[0] = 0;
3643						stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
3644#endif
3645						stcb->asoc.strmout[i].sid = i;
3646						stcb->asoc.strmout[i].last_msg_incomplete = 0;
3647						stcb->asoc.strmout[i].state = SCTP_STREAM_OPENING;
3648						stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], NULL);
3649					}
3650				}
3651				break;
3652#ifdef INET
3653			case SCTP_DSTADDRV4:
3654				if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in_addr)) {
3655					*error = EINVAL;
3656					return (1);
3657				}
3658				memset(&sin, 0, sizeof(struct sockaddr_in));
3659				sin.sin_family = AF_INET;
3660				sin.sin_len = sizeof(struct sockaddr_in);
3661				sin.sin_port = stcb->rport;
3662				m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3663				if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3664				    (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3665				    IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3666					*error = EINVAL;
3667					return (1);
3668				}
3669				if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL, stcb->asoc.port,
3670				    SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3671					*error = ENOBUFS;
3672					return (1);
3673				}
3674				break;
3675#endif
3676#ifdef INET6
3677			case SCTP_DSTADDRV6:
3678				if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in6_addr)) {
3679					*error = EINVAL;
3680					return (1);
3681				}
3682				memset(&sin6, 0, sizeof(struct sockaddr_in6));
3683				sin6.sin6_family = AF_INET6;
3684				sin6.sin6_len = sizeof(struct sockaddr_in6);
3685				sin6.sin6_port = stcb->rport;
3686				m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3687				if (IN6_IS_ADDR_UNSPECIFIED(&sin6.sin6_addr) ||
3688				    IN6_IS_ADDR_MULTICAST(&sin6.sin6_addr)) {
3689					*error = EINVAL;
3690					return (1);
3691				}
3692#ifdef INET
3693				if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3694					in6_sin6_2_sin(&sin, &sin6);
3695					if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3696					    (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3697					    IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3698						*error = EINVAL;
3699						return (1);
3700					}
3701					if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL, stcb->asoc.port,
3702					    SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3703						*error = ENOBUFS;
3704						return (1);
3705					}
3706				} else
3707#endif
3708					if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin6, NULL, stcb->asoc.port,
3709				    SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3710					*error = ENOBUFS;
3711					return (1);
3712				}
3713				break;
3714#endif
3715			default:
3716				break;
3717			}
3718		}
3719		at += CMSG_ALIGN(cmh.cmsg_len);
3720	}
3721	return (0);
3722}
3723
3724static struct sctp_tcb *
3725sctp_findassociation_cmsgs(struct sctp_inpcb **inp_p,
3726    uint16_t port,
3727    struct mbuf *control,
3728    struct sctp_nets **net_p,
3729    int *error)
3730{
3731	struct cmsghdr cmh;
3732	int tlen, at;
3733	struct sctp_tcb *stcb;
3734	struct sockaddr *addr;
3735#ifdef INET
3736	struct sockaddr_in sin;
3737#endif
3738#ifdef INET6
3739	struct sockaddr_in6 sin6;
3740#endif
3741
3742	tlen = SCTP_BUF_LEN(control);
3743	at = 0;
3744	while (at < tlen) {
3745		if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3746			/* There is not enough room for one more. */
3747			*error = EINVAL;
3748			return (NULL);
3749		}
3750		m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3751		if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3752			/* We dont't have a complete CMSG header. */
3753			*error = EINVAL;
3754			return (NULL);
3755		}
3756		if (((int)cmh.cmsg_len + at) > tlen) {
3757			/* We don't have the complete CMSG. */
3758			*error = EINVAL;
3759			return (NULL);
3760		}
3761		if (cmh.cmsg_level == IPPROTO_SCTP) {
3762			switch (cmh.cmsg_type) {
3763#ifdef INET
3764			case SCTP_DSTADDRV4:
3765				if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in_addr)) {
3766					*error = EINVAL;
3767					return (NULL);
3768				}
3769				memset(&sin, 0, sizeof(struct sockaddr_in));
3770				sin.sin_family = AF_INET;
3771				sin.sin_len = sizeof(struct sockaddr_in);
3772				sin.sin_port = port;
3773				m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3774				addr = (struct sockaddr *)&sin;
3775				break;
3776#endif
3777#ifdef INET6
3778			case SCTP_DSTADDRV6:
3779				if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in6_addr)) {
3780					*error = EINVAL;
3781					return (NULL);
3782				}
3783				memset(&sin6, 0, sizeof(struct sockaddr_in6));
3784				sin6.sin6_family = AF_INET6;
3785				sin6.sin6_len = sizeof(struct sockaddr_in6);
3786				sin6.sin6_port = port;
3787				m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3788#ifdef INET
3789				if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3790					in6_sin6_2_sin(&sin, &sin6);
3791					addr = (struct sockaddr *)&sin;
3792				} else
3793#endif
3794					addr = (struct sockaddr *)&sin6;
3795				break;
3796#endif
3797			default:
3798				addr = NULL;
3799				break;
3800			}
3801			if (addr) {
3802				stcb = sctp_findassociation_ep_addr(inp_p, addr, net_p, NULL, NULL);
3803				if (stcb != NULL) {
3804					return (stcb);
3805				}
3806			}
3807		}
3808		at += CMSG_ALIGN(cmh.cmsg_len);
3809	}
3810	return (NULL);
3811}
3812
3813static struct mbuf *
3814sctp_add_cookie(struct mbuf *init, int init_offset,
3815    struct mbuf *initack, int initack_offset, struct sctp_state_cookie *stc_in, uint8_t **signature)
3816{
3817	struct mbuf *copy_init, *copy_initack, *m_at, *sig, *mret;
3818	struct sctp_state_cookie *stc;
3819	struct sctp_paramhdr *ph;
3820	uint8_t *foo;
3821	int sig_offset;
3822	uint16_t cookie_sz;
3823
3824	mret = sctp_get_mbuf_for_msg((sizeof(struct sctp_state_cookie) +
3825	    sizeof(struct sctp_paramhdr)), 0,
3826	    M_NOWAIT, 1, MT_DATA);
3827	if (mret == NULL) {
3828		return (NULL);
3829	}
3830	copy_init = SCTP_M_COPYM(init, init_offset, M_COPYALL, M_NOWAIT);
3831	if (copy_init == NULL) {
3832		sctp_m_freem(mret);
3833		return (NULL);
3834	}
3835#ifdef SCTP_MBUF_LOGGING
3836	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3837		sctp_log_mbc(copy_init, SCTP_MBUF_ICOPY);
3838	}
3839#endif
3840	copy_initack = SCTP_M_COPYM(initack, initack_offset, M_COPYALL,
3841	    M_NOWAIT);
3842	if (copy_initack == NULL) {
3843		sctp_m_freem(mret);
3844		sctp_m_freem(copy_init);
3845		return (NULL);
3846	}
3847#ifdef SCTP_MBUF_LOGGING
3848	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3849		sctp_log_mbc(copy_initack, SCTP_MBUF_ICOPY);
3850	}
3851#endif
3852	/* easy side we just drop it on the end */
3853	ph = mtod(mret, struct sctp_paramhdr *);
3854	SCTP_BUF_LEN(mret) = sizeof(struct sctp_state_cookie) +
3855	    sizeof(struct sctp_paramhdr);
3856	stc = (struct sctp_state_cookie *)((caddr_t)ph +
3857	    sizeof(struct sctp_paramhdr));
3858	ph->param_type = htons(SCTP_STATE_COOKIE);
3859	ph->param_length = 0;	/* fill in at the end */
3860	/* Fill in the stc cookie data */
3861	memcpy(stc, stc_in, sizeof(struct sctp_state_cookie));
3862
3863	/* tack the INIT and then the INIT-ACK onto the chain */
3864	cookie_sz = 0;
3865	for (m_at = mret; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3866		cookie_sz += SCTP_BUF_LEN(m_at);
3867		if (SCTP_BUF_NEXT(m_at) == NULL) {
3868			SCTP_BUF_NEXT(m_at) = copy_init;
3869			break;
3870		}
3871	}
3872	for (m_at = copy_init; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3873		cookie_sz += SCTP_BUF_LEN(m_at);
3874		if (SCTP_BUF_NEXT(m_at) == NULL) {
3875			SCTP_BUF_NEXT(m_at) = copy_initack;
3876			break;
3877		}
3878	}
3879	for (m_at = copy_initack; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3880		cookie_sz += SCTP_BUF_LEN(m_at);
3881		if (SCTP_BUF_NEXT(m_at) == NULL) {
3882			break;
3883		}
3884	}
3885	sig = sctp_get_mbuf_for_msg(SCTP_SECRET_SIZE, 0, M_NOWAIT, 1, MT_DATA);
3886	if (sig == NULL) {
3887		/* no space, so free the entire chain */
3888		sctp_m_freem(mret);
3889		return (NULL);
3890	}
3891	SCTP_BUF_LEN(sig) = 0;
3892	SCTP_BUF_NEXT(m_at) = sig;
3893	sig_offset = 0;
3894	foo = (uint8_t *)(mtod(sig, caddr_t)+sig_offset);
3895	memset(foo, 0, SCTP_SIGNATURE_SIZE);
3896	*signature = foo;
3897	SCTP_BUF_LEN(sig) += SCTP_SIGNATURE_SIZE;
3898	cookie_sz += SCTP_SIGNATURE_SIZE;
3899	ph->param_length = htons(cookie_sz);
3900	return (mret);
3901}
3902
3903
3904static uint8_t
3905sctp_get_ect(struct sctp_tcb *stcb)
3906{
3907	if ((stcb != NULL) && (stcb->asoc.ecn_supported == 1)) {
3908		return (SCTP_ECT0_BIT);
3909	} else {
3910		return (0);
3911	}
3912}
3913
3914#if defined(INET) || defined(INET6)
3915static void
3916sctp_handle_no_route(struct sctp_tcb *stcb,
3917    struct sctp_nets *net,
3918    int so_locked)
3919{
3920	SCTPDBG(SCTP_DEBUG_OUTPUT1, "dropped packet - no valid source addr\n");
3921
3922	if (net) {
3923		SCTPDBG(SCTP_DEBUG_OUTPUT1, "Destination was ");
3924		SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT1, &net->ro._l_addr.sa);
3925		if (net->dest_state & SCTP_ADDR_CONFIRMED) {
3926			if ((net->dest_state & SCTP_ADDR_REACHABLE) && stcb) {
3927				SCTPDBG(SCTP_DEBUG_OUTPUT1, "no route takes interface %p down\n", (void *)net);
3928				sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
3929				    stcb, 0,
3930				    (void *)net,
3931				    so_locked);
3932				net->dest_state &= ~SCTP_ADDR_REACHABLE;
3933				net->dest_state &= ~SCTP_ADDR_PF;
3934			}
3935		}
3936		if (stcb) {
3937			if (net == stcb->asoc.primary_destination) {
3938				/* need a new primary */
3939				struct sctp_nets *alt;
3940
3941				alt = sctp_find_alternate_net(stcb, net, 0);
3942				if (alt != net) {
3943					if (stcb->asoc.alternate) {
3944						sctp_free_remote_addr(stcb->asoc.alternate);
3945					}
3946					stcb->asoc.alternate = alt;
3947					atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
3948					if (net->ro._s_addr) {
3949						sctp_free_ifa(net->ro._s_addr);
3950						net->ro._s_addr = NULL;
3951					}
3952					net->src_addr_selected = 0;
3953				}
3954			}
3955		}
3956	}
3957}
3958#endif
3959
3960static int
3961sctp_lowlevel_chunk_output(struct sctp_inpcb *inp,
3962    struct sctp_tcb *stcb,	/* may be NULL */
3963    struct sctp_nets *net,
3964    struct sockaddr *to,
3965    struct mbuf *m,
3966    uint32_t auth_offset,
3967    struct sctp_auth_chunk *auth,
3968    uint16_t auth_keyid,
3969    int nofragment_flag,
3970    int ecn_ok,
3971    int out_of_asoc_ok,
3972    uint16_t src_port,
3973    uint16_t dest_port,
3974    uint32_t v_tag,
3975    uint16_t port,
3976    union sctp_sockstore *over_addr,
3977    uint8_t mflowtype, uint32_t mflowid,
3978#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
3979    int so_locked SCTP_UNUSED
3980#else
3981    int so_locked
3982#endif
3983)
3984/* nofragment_flag to tell if IP_DF should be set (IPv4 only) */
3985{
3986	/**
3987	 * Given a mbuf chain (via SCTP_BUF_NEXT()) that holds a packet header
3988	 * WITH an SCTPHDR but no IP header, endpoint inp and sa structure:
3989	 * - fill in the HMAC digest of any AUTH chunk in the packet.
3990	 * - calculate and fill in the SCTP checksum.
3991	 * - prepend an IP address header.
3992	 * - if boundall use INADDR_ANY.
3993	 * - if boundspecific do source address selection.
3994	 * - set fragmentation option for ipV4.
3995	 * - On return from IP output, check/adjust mtu size of output
3996	 *   interface and smallest_mtu size as well.
3997	 */
3998	/* Will need ifdefs around this */
3999	struct mbuf *newm;
4000	struct sctphdr *sctphdr;
4001	int packet_length;
4002	int ret;
4003#if defined(INET) || defined(INET6)
4004	uint32_t vrf_id;
4005#endif
4006#if defined(INET) || defined(INET6)
4007	struct mbuf *o_pak;
4008	sctp_route_t *ro = NULL;
4009	struct udphdr *udp = NULL;
4010#endif
4011	uint8_t tos_value;
4012#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4013	struct socket *so = NULL;
4014#endif
4015
4016	if ((net) && (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)) {
4017		SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4018		sctp_m_freem(m);
4019		return (EFAULT);
4020	}
4021#if defined(INET) || defined(INET6)
4022	if (stcb) {
4023		vrf_id = stcb->asoc.vrf_id;
4024	} else {
4025		vrf_id = inp->def_vrf_id;
4026	}
4027#endif
4028	/* fill in the HMAC digest for any AUTH chunk in the packet */
4029	if ((auth != NULL) && (stcb != NULL)) {
4030		sctp_fill_hmac_digest_m(m, auth_offset, auth, stcb, auth_keyid);
4031	}
4032	if (net) {
4033		tos_value = net->dscp;
4034	} else if (stcb) {
4035		tos_value = stcb->asoc.default_dscp;
4036	} else {
4037		tos_value = inp->sctp_ep.default_dscp;
4038	}
4039
4040	switch (to->sa_family) {
4041#ifdef INET
4042	case AF_INET:
4043		{
4044			struct ip *ip = NULL;
4045			sctp_route_t iproute;
4046			int len;
4047
4048			len = SCTP_MIN_V4_OVERHEAD;
4049			if (port) {
4050				len += sizeof(struct udphdr);
4051			}
4052			newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4053			if (newm == NULL) {
4054				sctp_m_freem(m);
4055				SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4056				return (ENOMEM);
4057			}
4058			SCTP_ALIGN_TO_END(newm, len);
4059			SCTP_BUF_LEN(newm) = len;
4060			SCTP_BUF_NEXT(newm) = m;
4061			m = newm;
4062			if (net != NULL) {
4063				m->m_pkthdr.flowid = net->flowid;
4064				M_HASHTYPE_SET(m, net->flowtype);
4065			} else {
4066				m->m_pkthdr.flowid = mflowid;
4067				M_HASHTYPE_SET(m, mflowtype);
4068			}
4069			packet_length = sctp_calculate_len(m);
4070			ip = mtod(m, struct ip *);
4071			ip->ip_v = IPVERSION;
4072			ip->ip_hl = (sizeof(struct ip) >> 2);
4073			if (tos_value == 0) {
4074				/*
4075				 * This means especially, that it is not set
4076				 * at the SCTP layer. So use the value from
4077				 * the IP layer.
4078				 */
4079				tos_value = inp->ip_inp.inp.inp_ip_tos;
4080			}
4081			tos_value &= 0xfc;
4082			if (ecn_ok) {
4083				tos_value |= sctp_get_ect(stcb);
4084			}
4085			if ((nofragment_flag) && (port == 0)) {
4086				ip->ip_off = htons(IP_DF);
4087			} else {
4088				ip->ip_off = htons(0);
4089			}
4090			/* FreeBSD has a function for ip_id's */
4091			ip_fillid(ip);
4092
4093			ip->ip_ttl = inp->ip_inp.inp.inp_ip_ttl;
4094			ip->ip_len = htons(packet_length);
4095			ip->ip_tos = tos_value;
4096			if (port) {
4097				ip->ip_p = IPPROTO_UDP;
4098			} else {
4099				ip->ip_p = IPPROTO_SCTP;
4100			}
4101			ip->ip_sum = 0;
4102			if (net == NULL) {
4103				ro = &iproute;
4104				memset(&iproute, 0, sizeof(iproute));
4105				memcpy(&ro->ro_dst, to, to->sa_len);
4106			} else {
4107				ro = (sctp_route_t *)&net->ro;
4108			}
4109			/* Now the address selection part */
4110			ip->ip_dst.s_addr = ((struct sockaddr_in *)to)->sin_addr.s_addr;
4111
4112			/* call the routine to select the src address */
4113			if (net && out_of_asoc_ok == 0) {
4114				if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4115					sctp_free_ifa(net->ro._s_addr);
4116					net->ro._s_addr = NULL;
4117					net->src_addr_selected = 0;
4118					if (ro->ro_rt) {
4119						RTFREE(ro->ro_rt);
4120						ro->ro_rt = NULL;
4121					}
4122				}
4123				if (net->src_addr_selected == 0) {
4124					/* Cache the source address */
4125					net->ro._s_addr = sctp_source_address_selection(inp, stcb,
4126					    ro, net, 0,
4127					    vrf_id);
4128					net->src_addr_selected = 1;
4129				}
4130				if (net->ro._s_addr == NULL) {
4131					/* No route to host */
4132					net->src_addr_selected = 0;
4133					sctp_handle_no_route(stcb, net, so_locked);
4134					SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4135					sctp_m_freem(m);
4136					return (EHOSTUNREACH);
4137				}
4138				ip->ip_src = net->ro._s_addr->address.sin.sin_addr;
4139			} else {
4140				if (over_addr == NULL) {
4141					struct sctp_ifa *_lsrc;
4142
4143					_lsrc = sctp_source_address_selection(inp, stcb, ro,
4144					    net,
4145					    out_of_asoc_ok,
4146					    vrf_id);
4147					if (_lsrc == NULL) {
4148						sctp_handle_no_route(stcb, net, so_locked);
4149						SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4150						sctp_m_freem(m);
4151						return (EHOSTUNREACH);
4152					}
4153					ip->ip_src = _lsrc->address.sin.sin_addr;
4154					sctp_free_ifa(_lsrc);
4155				} else {
4156					ip->ip_src = over_addr->sin.sin_addr;
4157					SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
4158				}
4159			}
4160			if (port) {
4161				if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4162					sctp_handle_no_route(stcb, net, so_locked);
4163					SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4164					sctp_m_freem(m);
4165					return (EHOSTUNREACH);
4166				}
4167				udp = (struct udphdr *)((caddr_t)ip + sizeof(struct ip));
4168				udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4169				udp->uh_dport = port;
4170				udp->uh_ulen = htons((uint16_t)(packet_length - sizeof(struct ip)));
4171				if (V_udp_cksum) {
4172					udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
4173				} else {
4174					udp->uh_sum = 0;
4175				}
4176				sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4177			} else {
4178				sctphdr = (struct sctphdr *)((caddr_t)ip + sizeof(struct ip));
4179			}
4180
4181			sctphdr->src_port = src_port;
4182			sctphdr->dest_port = dest_port;
4183			sctphdr->v_tag = v_tag;
4184			sctphdr->checksum = 0;
4185
4186			/*
4187			 * If source address selection fails and we find no
4188			 * route then the ip_output should fail as well with
4189			 * a NO_ROUTE_TO_HOST type error. We probably should
4190			 * catch that somewhere and abort the association
4191			 * right away (assuming this is an INIT being sent).
4192			 */
4193			if (ro->ro_rt == NULL) {
4194				/*
4195				 * src addr selection failed to find a route
4196				 * (or valid source addr), so we can't get
4197				 * there from here (yet)!
4198				 */
4199				sctp_handle_no_route(stcb, net, so_locked);
4200				SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4201				sctp_m_freem(m);
4202				return (EHOSTUNREACH);
4203			}
4204			if (ro != &iproute) {
4205				memcpy(&iproute, ro, sizeof(*ro));
4206			}
4207			SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv4 output routine from low level src addr:%x\n",
4208			    (uint32_t)(ntohl(ip->ip_src.s_addr)));
4209			SCTPDBG(SCTP_DEBUG_OUTPUT3, "Destination is %x\n",
4210			    (uint32_t)(ntohl(ip->ip_dst.s_addr)));
4211			SCTPDBG(SCTP_DEBUG_OUTPUT3, "RTP route is %p through\n",
4212			    (void *)ro->ro_rt);
4213
4214			if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4215				/* failed to prepend data, give up */
4216				SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4217				sctp_m_freem(m);
4218				return (ENOMEM);
4219			}
4220			SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4221			if (port) {
4222#if defined(SCTP_WITH_NO_CSUM)
4223				SCTP_STAT_INCR(sctps_sendnocrc);
4224#else
4225				sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip) + sizeof(struct udphdr));
4226				SCTP_STAT_INCR(sctps_sendswcrc);
4227#endif
4228				if (V_udp_cksum) {
4229					SCTP_ENABLE_UDP_CSUM(o_pak);
4230				}
4231			} else {
4232#if defined(SCTP_WITH_NO_CSUM)
4233				SCTP_STAT_INCR(sctps_sendnocrc);
4234#else
4235				m->m_pkthdr.csum_flags = CSUM_SCTP;
4236				m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4237				SCTP_STAT_INCR(sctps_sendhwcrc);
4238#endif
4239			}
4240#ifdef SCTP_PACKET_LOGGING
4241			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4242				sctp_packet_log(o_pak);
4243#endif
4244			/* send it out.  table id is taken from stcb */
4245#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4246			if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4247				so = SCTP_INP_SO(inp);
4248				SCTP_SOCKET_UNLOCK(so, 0);
4249			}
4250#endif
4251			SCTP_IP_OUTPUT(ret, o_pak, ro, stcb, vrf_id);
4252#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4253			if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4254				atomic_add_int(&stcb->asoc.refcnt, 1);
4255				SCTP_TCB_UNLOCK(stcb);
4256				SCTP_SOCKET_LOCK(so, 0);
4257				SCTP_TCB_LOCK(stcb);
4258				atomic_subtract_int(&stcb->asoc.refcnt, 1);
4259			}
4260#endif
4261			SCTP_STAT_INCR(sctps_sendpackets);
4262			SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4263			if (ret)
4264				SCTP_STAT_INCR(sctps_senderrors);
4265
4266			SCTPDBG(SCTP_DEBUG_OUTPUT3, "IP output returns %d\n", ret);
4267			if (net == NULL) {
4268				/* free tempy routes */
4269				RO_RTFREE(ro);
4270			} else {
4271				/*
4272				 * PMTU check versus smallest asoc MTU goes
4273				 * here
4274				 */
4275				if ((ro->ro_rt != NULL) &&
4276				    (net->ro._s_addr)) {
4277					uint32_t mtu;
4278
4279					mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4280					if (net->port) {
4281						mtu -= sizeof(struct udphdr);
4282					}
4283					if (mtu && (stcb->asoc.smallest_mtu > mtu)) {
4284						sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4285						net->mtu = mtu;
4286					}
4287				} else if (ro->ro_rt == NULL) {
4288					/* route was freed */
4289					if (net->ro._s_addr &&
4290					    net->src_addr_selected) {
4291						sctp_free_ifa(net->ro._s_addr);
4292						net->ro._s_addr = NULL;
4293					}
4294					net->src_addr_selected = 0;
4295				}
4296			}
4297			return (ret);
4298		}
4299#endif
4300#ifdef INET6
4301	case AF_INET6:
4302		{
4303			uint32_t flowlabel, flowinfo;
4304			struct ip6_hdr *ip6h;
4305			struct route_in6 ip6route;
4306			struct ifnet *ifp;
4307			struct sockaddr_in6 *sin6, tmp, *lsa6, lsa6_tmp;
4308			int prev_scope = 0;
4309			struct sockaddr_in6 lsa6_storage;
4310			int error;
4311			u_short prev_port = 0;
4312			int len;
4313
4314			if (net) {
4315				flowlabel = net->flowlabel;
4316			} else if (stcb) {
4317				flowlabel = stcb->asoc.default_flowlabel;
4318			} else {
4319				flowlabel = inp->sctp_ep.default_flowlabel;
4320			}
4321			if (flowlabel == 0) {
4322				/*
4323				 * This means especially, that it is not set
4324				 * at the SCTP layer. So use the value from
4325				 * the IP layer.
4326				 */
4327				flowlabel = ntohl(((struct in6pcb *)inp)->in6p_flowinfo);
4328			}
4329			flowlabel &= 0x000fffff;
4330			len = SCTP_MIN_OVERHEAD;
4331			if (port) {
4332				len += sizeof(struct udphdr);
4333			}
4334			newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4335			if (newm == NULL) {
4336				sctp_m_freem(m);
4337				SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4338				return (ENOMEM);
4339			}
4340			SCTP_ALIGN_TO_END(newm, len);
4341			SCTP_BUF_LEN(newm) = len;
4342			SCTP_BUF_NEXT(newm) = m;
4343			m = newm;
4344			if (net != NULL) {
4345				m->m_pkthdr.flowid = net->flowid;
4346				M_HASHTYPE_SET(m, net->flowtype);
4347			} else {
4348				m->m_pkthdr.flowid = mflowid;
4349				M_HASHTYPE_SET(m, mflowtype);
4350			}
4351			packet_length = sctp_calculate_len(m);
4352
4353			ip6h = mtod(m, struct ip6_hdr *);
4354			/* protect *sin6 from overwrite */
4355			sin6 = (struct sockaddr_in6 *)to;
4356			tmp = *sin6;
4357			sin6 = &tmp;
4358
4359			/* KAME hack: embed scopeid */
4360			if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4361				SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4362				return (EINVAL);
4363			}
4364			if (net == NULL) {
4365				memset(&ip6route, 0, sizeof(ip6route));
4366				ro = (sctp_route_t *)&ip6route;
4367				memcpy(&ro->ro_dst, sin6, sin6->sin6_len);
4368			} else {
4369				ro = (sctp_route_t *)&net->ro;
4370			}
4371			/*
4372			 * We assume here that inp_flow is in host byte
4373			 * order within the TCB!
4374			 */
4375			if (tos_value == 0) {
4376				/*
4377				 * This means especially, that it is not set
4378				 * at the SCTP layer. So use the value from
4379				 * the IP layer.
4380				 */
4381				tos_value = (ntohl(((struct in6pcb *)inp)->in6p_flowinfo) >> 20) & 0xff;
4382			}
4383			tos_value &= 0xfc;
4384			if (ecn_ok) {
4385				tos_value |= sctp_get_ect(stcb);
4386			}
4387			flowinfo = 0x06;
4388			flowinfo <<= 8;
4389			flowinfo |= tos_value;
4390			flowinfo <<= 20;
4391			flowinfo |= flowlabel;
4392			ip6h->ip6_flow = htonl(flowinfo);
4393			if (port) {
4394				ip6h->ip6_nxt = IPPROTO_UDP;
4395			} else {
4396				ip6h->ip6_nxt = IPPROTO_SCTP;
4397			}
4398			ip6h->ip6_plen = (uint16_t)(packet_length - sizeof(struct ip6_hdr));
4399			ip6h->ip6_dst = sin6->sin6_addr;
4400
4401			/*
4402			 * Add SRC address selection here: we can only reuse
4403			 * to a limited degree the kame src-addr-sel, since
4404			 * we can try their selection but it may not be
4405			 * bound.
4406			 */
4407			bzero(&lsa6_tmp, sizeof(lsa6_tmp));
4408			lsa6_tmp.sin6_family = AF_INET6;
4409			lsa6_tmp.sin6_len = sizeof(lsa6_tmp);
4410			lsa6 = &lsa6_tmp;
4411			if (net && out_of_asoc_ok == 0) {
4412				if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4413					sctp_free_ifa(net->ro._s_addr);
4414					net->ro._s_addr = NULL;
4415					net->src_addr_selected = 0;
4416					if (ro->ro_rt) {
4417						RTFREE(ro->ro_rt);
4418						ro->ro_rt = NULL;
4419					}
4420				}
4421				if (net->src_addr_selected == 0) {
4422					sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4423					/* KAME hack: embed scopeid */
4424					if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4425						SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4426						return (EINVAL);
4427					}
4428					/* Cache the source address */
4429					net->ro._s_addr = sctp_source_address_selection(inp,
4430					    stcb,
4431					    ro,
4432					    net,
4433					    0,
4434					    vrf_id);
4435					(void)sa6_recoverscope(sin6);
4436					net->src_addr_selected = 1;
4437				}
4438				if (net->ro._s_addr == NULL) {
4439					SCTPDBG(SCTP_DEBUG_OUTPUT3, "V6:No route to host\n");
4440					net->src_addr_selected = 0;
4441					sctp_handle_no_route(stcb, net, so_locked);
4442					SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4443					sctp_m_freem(m);
4444					return (EHOSTUNREACH);
4445				}
4446				lsa6->sin6_addr = net->ro._s_addr->address.sin6.sin6_addr;
4447			} else {
4448				sin6 = (struct sockaddr_in6 *)&ro->ro_dst;
4449				/* KAME hack: embed scopeid */
4450				if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4451					SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4452					return (EINVAL);
4453				}
4454				if (over_addr == NULL) {
4455					struct sctp_ifa *_lsrc;
4456
4457					_lsrc = sctp_source_address_selection(inp, stcb, ro,
4458					    net,
4459					    out_of_asoc_ok,
4460					    vrf_id);
4461					if (_lsrc == NULL) {
4462						sctp_handle_no_route(stcb, net, so_locked);
4463						SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4464						sctp_m_freem(m);
4465						return (EHOSTUNREACH);
4466					}
4467					lsa6->sin6_addr = _lsrc->address.sin6.sin6_addr;
4468					sctp_free_ifa(_lsrc);
4469				} else {
4470					lsa6->sin6_addr = over_addr->sin6.sin6_addr;
4471					SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
4472				}
4473				(void)sa6_recoverscope(sin6);
4474			}
4475			lsa6->sin6_port = inp->sctp_lport;
4476
4477			if (ro->ro_rt == NULL) {
4478				/*
4479				 * src addr selection failed to find a route
4480				 * (or valid source addr), so we can't get
4481				 * there from here!
4482				 */
4483				sctp_handle_no_route(stcb, net, so_locked);
4484				SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4485				sctp_m_freem(m);
4486				return (EHOSTUNREACH);
4487			}
4488			/*
4489			 * XXX: sa6 may not have a valid sin6_scope_id in
4490			 * the non-SCOPEDROUTING case.
4491			 */
4492			bzero(&lsa6_storage, sizeof(lsa6_storage));
4493			lsa6_storage.sin6_family = AF_INET6;
4494			lsa6_storage.sin6_len = sizeof(lsa6_storage);
4495			lsa6_storage.sin6_addr = lsa6->sin6_addr;
4496			if ((error = sa6_recoverscope(&lsa6_storage)) != 0) {
4497				SCTPDBG(SCTP_DEBUG_OUTPUT3, "recover scope fails error %d\n", error);
4498				sctp_m_freem(m);
4499				return (error);
4500			}
4501			/* XXX */
4502			lsa6_storage.sin6_addr = lsa6->sin6_addr;
4503			lsa6_storage.sin6_port = inp->sctp_lport;
4504			lsa6 = &lsa6_storage;
4505			ip6h->ip6_src = lsa6->sin6_addr;
4506
4507			if (port) {
4508				if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4509					sctp_handle_no_route(stcb, net, so_locked);
4510					SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4511					sctp_m_freem(m);
4512					return (EHOSTUNREACH);
4513				}
4514				udp = (struct udphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4515				udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4516				udp->uh_dport = port;
4517				udp->uh_ulen = htons((uint16_t)(packet_length - sizeof(struct ip6_hdr)));
4518				udp->uh_sum = 0;
4519				sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4520			} else {
4521				sctphdr = (struct sctphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4522			}
4523
4524			sctphdr->src_port = src_port;
4525			sctphdr->dest_port = dest_port;
4526			sctphdr->v_tag = v_tag;
4527			sctphdr->checksum = 0;
4528
4529			/*
4530			 * We set the hop limit now since there is a good
4531			 * chance that our ro pointer is now filled
4532			 */
4533			ip6h->ip6_hlim = SCTP_GET_HLIM(inp, ro);
4534			ifp = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
4535
4536#ifdef SCTP_DEBUG
4537			/* Copy to be sure something bad is not happening */
4538			sin6->sin6_addr = ip6h->ip6_dst;
4539			lsa6->sin6_addr = ip6h->ip6_src;
4540#endif
4541
4542			SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv6 output routine from low level\n");
4543			SCTPDBG(SCTP_DEBUG_OUTPUT3, "src: ");
4544			SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)lsa6);
4545			SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst: ");
4546			SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)sin6);
4547			if (net) {
4548				sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4549				/*
4550				 * preserve the port and scope for link
4551				 * local send
4552				 */
4553				prev_scope = sin6->sin6_scope_id;
4554				prev_port = sin6->sin6_port;
4555			}
4556			if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4557				/* failed to prepend data, give up */
4558				sctp_m_freem(m);
4559				SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4560				return (ENOMEM);
4561			}
4562			SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4563			if (port) {
4564#if defined(SCTP_WITH_NO_CSUM)
4565				SCTP_STAT_INCR(sctps_sendnocrc);
4566#else
4567				sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
4568				SCTP_STAT_INCR(sctps_sendswcrc);
4569#endif
4570				if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), packet_length - sizeof(struct ip6_hdr))) == 0) {
4571					udp->uh_sum = 0xffff;
4572				}
4573			} else {
4574#if defined(SCTP_WITH_NO_CSUM)
4575				SCTP_STAT_INCR(sctps_sendnocrc);
4576#else
4577				m->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
4578				m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4579				SCTP_STAT_INCR(sctps_sendhwcrc);
4580#endif
4581			}
4582			/* send it out. table id is taken from stcb */
4583#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4584			if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4585				so = SCTP_INP_SO(inp);
4586				SCTP_SOCKET_UNLOCK(so, 0);
4587			}
4588#endif
4589#ifdef SCTP_PACKET_LOGGING
4590			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4591				sctp_packet_log(o_pak);
4592#endif
4593			SCTP_IP6_OUTPUT(ret, o_pak, (struct route_in6 *)ro, &ifp, stcb, vrf_id);
4594#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4595			if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4596				atomic_add_int(&stcb->asoc.refcnt, 1);
4597				SCTP_TCB_UNLOCK(stcb);
4598				SCTP_SOCKET_LOCK(so, 0);
4599				SCTP_TCB_LOCK(stcb);
4600				atomic_subtract_int(&stcb->asoc.refcnt, 1);
4601			}
4602#endif
4603			if (net) {
4604				/* for link local this must be done */
4605				sin6->sin6_scope_id = prev_scope;
4606				sin6->sin6_port = prev_port;
4607			}
4608			SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
4609			SCTP_STAT_INCR(sctps_sendpackets);
4610			SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4611			if (ret) {
4612				SCTP_STAT_INCR(sctps_senderrors);
4613			}
4614			if (net == NULL) {
4615				/* Now if we had a temp route free it */
4616				RO_RTFREE(ro);
4617			} else {
4618				/*
4619				 * PMTU check versus smallest asoc MTU goes
4620				 * here
4621				 */
4622				if (ro->ro_rt == NULL) {
4623					/* Route was freed */
4624					if (net->ro._s_addr &&
4625					    net->src_addr_selected) {
4626						sctp_free_ifa(net->ro._s_addr);
4627						net->ro._s_addr = NULL;
4628					}
4629					net->src_addr_selected = 0;
4630				}
4631				if ((ro->ro_rt != NULL) &&
4632				    (net->ro._s_addr)) {
4633					uint32_t mtu;
4634
4635					mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4636					if (mtu &&
4637					    (stcb->asoc.smallest_mtu > mtu)) {
4638						sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4639						net->mtu = mtu;
4640						if (net->port) {
4641							net->mtu -= sizeof(struct udphdr);
4642						}
4643					}
4644				} else if (ifp) {
4645					if (ND_IFINFO(ifp)->linkmtu &&
4646					    (stcb->asoc.smallest_mtu > ND_IFINFO(ifp)->linkmtu)) {
4647						sctp_mtu_size_reset(inp,
4648						    &stcb->asoc,
4649						    ND_IFINFO(ifp)->linkmtu);
4650					}
4651				}
4652			}
4653			return (ret);
4654		}
4655#endif
4656	default:
4657		SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
4658		    ((struct sockaddr *)to)->sa_family);
4659		sctp_m_freem(m);
4660		SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4661		return (EFAULT);
4662	}
4663}
4664
4665
4666void
4667sctp_send_initiate(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int so_locked
4668#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
4669    SCTP_UNUSED
4670#endif
4671)
4672{
4673	struct mbuf *m, *m_last;
4674	struct sctp_nets *net;
4675	struct sctp_init_chunk *init;
4676	struct sctp_supported_addr_param *sup_addr;
4677	struct sctp_adaptation_layer_indication *ali;
4678	struct sctp_supported_chunk_types_param *pr_supported;
4679	struct sctp_paramhdr *ph;
4680	int cnt_inits_to = 0;
4681	int error;
4682	uint16_t num_ext, chunk_len, padding_len, parameter_len;
4683
4684	/* INIT's always go to the primary (and usually ONLY address) */
4685	net = stcb->asoc.primary_destination;
4686	if (net == NULL) {
4687		net = TAILQ_FIRST(&stcb->asoc.nets);
4688		if (net == NULL) {
4689			/* TSNH */
4690			return;
4691		}
4692		/* we confirm any address we send an INIT to */
4693		net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4694		(void)sctp_set_primary_addr(stcb, NULL, net);
4695	} else {
4696		/* we confirm any address we send an INIT to */
4697		net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4698	}
4699	SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
4700#ifdef INET6
4701	if (net->ro._l_addr.sa.sa_family == AF_INET6) {
4702		/*
4703		 * special hook, if we are sending to link local it will not
4704		 * show up in our private address count.
4705		 */
4706		if (IN6_IS_ADDR_LINKLOCAL(&net->ro._l_addr.sin6.sin6_addr))
4707			cnt_inits_to = 1;
4708	}
4709#endif
4710	if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4711		/* This case should not happen */
4712		SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
4713		return;
4714	}
4715	/* start the INIT timer */
4716	sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
4717
4718	m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_NOWAIT, 1, MT_DATA);
4719	if (m == NULL) {
4720		/* No memory, INIT timer will re-attempt. */
4721		SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
4722		return;
4723	}
4724	chunk_len = (uint16_t)sizeof(struct sctp_init_chunk);
4725	padding_len = 0;
4726	/* Now lets put the chunk header in place */
4727	init = mtod(m, struct sctp_init_chunk *);
4728	/* now the chunk header */
4729	init->ch.chunk_type = SCTP_INITIATION;
4730	init->ch.chunk_flags = 0;
4731	/* fill in later from mbuf we build */
4732	init->ch.chunk_length = 0;
4733	/* place in my tag */
4734	init->init.initiate_tag = htonl(stcb->asoc.my_vtag);
4735	/* set up some of the credits. */
4736	init->init.a_rwnd = htonl(max(inp->sctp_socket ? SCTP_SB_LIMIT_RCV(inp->sctp_socket) : 0,
4737	    SCTP_MINIMAL_RWND));
4738	init->init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
4739	init->init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
4740	init->init.initial_tsn = htonl(stcb->asoc.init_seq_number);
4741
4742	/* Adaptation layer indication parameter */
4743	if (inp->sctp_ep.adaptation_layer_indicator_provided) {
4744		parameter_len = (uint16_t)sizeof(struct sctp_adaptation_layer_indication);
4745		ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
4746		ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
4747		ali->ph.param_length = htons(parameter_len);
4748		ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
4749		chunk_len += parameter_len;
4750	}
4751	/* ECN parameter */
4752	if (stcb->asoc.ecn_supported == 1) {
4753		parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4754		ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4755		ph->param_type = htons(SCTP_ECN_CAPABLE);
4756		ph->param_length = htons(parameter_len);
4757		chunk_len += parameter_len;
4758	}
4759	/* PR-SCTP supported parameter */
4760	if (stcb->asoc.prsctp_supported == 1) {
4761		parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4762		ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4763		ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
4764		ph->param_length = htons(parameter_len);
4765		chunk_len += parameter_len;
4766	}
4767	/* Add NAT friendly parameter. */
4768	if (SCTP_BASE_SYSCTL(sctp_inits_include_nat_friendly)) {
4769		parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4770		ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4771		ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
4772		ph->param_length = htons(parameter_len);
4773		chunk_len += parameter_len;
4774	}
4775	/* And now tell the peer which extensions we support */
4776	num_ext = 0;
4777	pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
4778	if (stcb->asoc.prsctp_supported == 1) {
4779		pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
4780		if (stcb->asoc.idata_supported) {
4781			pr_supported->chunk_types[num_ext++] = SCTP_IFORWARD_CUM_TSN;
4782		}
4783	}
4784	if (stcb->asoc.auth_supported == 1) {
4785		pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
4786	}
4787	if (stcb->asoc.asconf_supported == 1) {
4788		pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
4789		pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
4790	}
4791	if (stcb->asoc.reconfig_supported == 1) {
4792		pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
4793	}
4794	if (stcb->asoc.idata_supported) {
4795		pr_supported->chunk_types[num_ext++] = SCTP_IDATA;
4796	}
4797	if (stcb->asoc.nrsack_supported == 1) {
4798		pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
4799	}
4800	if (stcb->asoc.pktdrop_supported == 1) {
4801		pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
4802	}
4803	if (num_ext > 0) {
4804		parameter_len = (uint16_t)sizeof(struct sctp_supported_chunk_types_param) + num_ext;
4805		pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
4806		pr_supported->ph.param_length = htons(parameter_len);
4807		padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4808		chunk_len += parameter_len;
4809	}
4810	/* add authentication parameters */
4811	if (stcb->asoc.auth_supported) {
4812		/* attach RANDOM parameter, if available */
4813		if (stcb->asoc.authinfo.random != NULL) {
4814			struct sctp_auth_random *randp;
4815
4816			if (padding_len > 0) {
4817				memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4818				chunk_len += padding_len;
4819				padding_len = 0;
4820			}
4821			randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
4822			parameter_len = (uint16_t)sizeof(struct sctp_auth_random) + stcb->asoc.authinfo.random_len;
4823			/* random key already contains the header */
4824			memcpy(randp, stcb->asoc.authinfo.random->key, parameter_len);
4825			padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4826			chunk_len += parameter_len;
4827		}
4828		/* add HMAC_ALGO parameter */
4829		if (stcb->asoc.local_hmacs != NULL) {
4830			struct sctp_auth_hmac_algo *hmacs;
4831
4832			if (padding_len > 0) {
4833				memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4834				chunk_len += padding_len;
4835				padding_len = 0;
4836			}
4837			hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
4838			parameter_len = (uint16_t)(sizeof(struct sctp_auth_hmac_algo) +
4839			    stcb->asoc.local_hmacs->num_algo * sizeof(uint16_t));
4840			hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
4841			hmacs->ph.param_length = htons(parameter_len);
4842			sctp_serialize_hmaclist(stcb->asoc.local_hmacs, (uint8_t *)hmacs->hmac_ids);
4843			padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4844			chunk_len += parameter_len;
4845		}
4846		/* add CHUNKS parameter */
4847		if (stcb->asoc.local_auth_chunks != NULL) {
4848			struct sctp_auth_chunk_list *chunks;
4849
4850			if (padding_len > 0) {
4851				memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4852				chunk_len += padding_len;
4853				padding_len = 0;
4854			}
4855			chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
4856			parameter_len = (uint16_t)(sizeof(struct sctp_auth_chunk_list) +
4857			    sctp_auth_get_chklist_size(stcb->asoc.local_auth_chunks));
4858			chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
4859			chunks->ph.param_length = htons(parameter_len);
4860			sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks, chunks->chunk_types);
4861			padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4862			chunk_len += parameter_len;
4863		}
4864	}
4865	/* now any cookie time extensions */
4866	if (stcb->asoc.cookie_preserve_req) {
4867		struct sctp_cookie_perserve_param *cookie_preserve;
4868
4869		if (padding_len > 0) {
4870			memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4871			chunk_len += padding_len;
4872			padding_len = 0;
4873		}
4874		parameter_len = (uint16_t)sizeof(struct sctp_cookie_perserve_param);
4875		cookie_preserve = (struct sctp_cookie_perserve_param *)(mtod(m, caddr_t)+chunk_len);
4876		cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
4877		cookie_preserve->ph.param_length = htons(parameter_len);
4878		cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
4879		stcb->asoc.cookie_preserve_req = 0;
4880		chunk_len += parameter_len;
4881	}
4882	if (stcb->asoc.scope.ipv4_addr_legal || stcb->asoc.scope.ipv6_addr_legal) {
4883		uint8_t i;
4884
4885		if (padding_len > 0) {
4886			memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4887			chunk_len += padding_len;
4888			padding_len = 0;
4889		}
4890		parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4891		if (stcb->asoc.scope.ipv4_addr_legal) {
4892			parameter_len += (uint16_t)sizeof(uint16_t);
4893		}
4894		if (stcb->asoc.scope.ipv6_addr_legal) {
4895			parameter_len += (uint16_t)sizeof(uint16_t);
4896		}
4897		sup_addr = (struct sctp_supported_addr_param *)(mtod(m, caddr_t)+chunk_len);
4898		sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
4899		sup_addr->ph.param_length = htons(parameter_len);
4900		i = 0;
4901		if (stcb->asoc.scope.ipv4_addr_legal) {
4902			sup_addr->addr_type[i++] = htons(SCTP_IPV4_ADDRESS);
4903		}
4904		if (stcb->asoc.scope.ipv6_addr_legal) {
4905			sup_addr->addr_type[i++] = htons(SCTP_IPV6_ADDRESS);
4906		}
4907		padding_len = 4 - 2 * i;
4908		chunk_len += parameter_len;
4909	}
4910	SCTP_BUF_LEN(m) = chunk_len;
4911	/* now the addresses */
4912	/*
4913	 * To optimize this we could put the scoping stuff into a structure
4914	 * and remove the individual uint8's from the assoc structure. Then
4915	 * we could just sifa in the address within the stcb. But for now
4916	 * this is a quick hack to get the address stuff teased apart.
4917	 */
4918	m_last = sctp_add_addresses_to_i_ia(inp, stcb, &stcb->asoc.scope,
4919	    m, cnt_inits_to,
4920	    &padding_len, &chunk_len);
4921
4922	init->ch.chunk_length = htons(chunk_len);
4923	if (padding_len > 0) {
4924		if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
4925			sctp_m_freem(m);
4926			return;
4927		}
4928	}
4929	SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - calls lowlevel_output\n");
4930	if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
4931	    (struct sockaddr *)&net->ro._l_addr,
4932	    m, 0, NULL, 0, 0, 0, 0,
4933	    inp->sctp_lport, stcb->rport, htonl(0),
4934	    net->port, NULL,
4935	    0, 0,
4936	    so_locked))) {
4937		SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak send error %d\n", error);
4938		if (error == ENOBUFS) {
4939			stcb->asoc.ifp_had_enobuf = 1;
4940			SCTP_STAT_INCR(sctps_lowlevelerr);
4941		}
4942	} else {
4943		stcb->asoc.ifp_had_enobuf = 0;
4944	}
4945	SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
4946	(void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
4947}
4948
4949struct mbuf *
4950sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
4951    int param_offset, int *abort_processing, struct sctp_chunkhdr *cp, int *nat_friendly)
4952{
4953	/*
4954	 * Given a mbuf containing an INIT or INIT-ACK with the param_offset
4955	 * being equal to the beginning of the params i.e. (iphlen +
4956	 * sizeof(struct sctp_init_msg) parse through the parameters to the
4957	 * end of the mbuf verifying that all parameters are known.
4958	 *
4959	 * For unknown parameters build and return a mbuf with
4960	 * UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
4961	 * processing this chunk stop, and set *abort_processing to 1.
4962	 *
4963	 * By having param_offset be pre-set to where parameters begin it is
4964	 * hoped that this routine may be reused in the future by new
4965	 * features.
4966	 */
4967	struct sctp_paramhdr *phdr, params;
4968
4969	struct mbuf *mat, *op_err;
4970	char tempbuf[SCTP_PARAM_BUFFER_SIZE];
4971	int at, limit, pad_needed;
4972	uint16_t ptype, plen, padded_size;
4973	int err_at;
4974
4975	*abort_processing = 0;
4976	mat = in_initpkt;
4977	err_at = 0;
4978	limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
4979	at = param_offset;
4980	op_err = NULL;
4981	SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
4982	phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
4983	while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
4984		ptype = ntohs(phdr->param_type);
4985		plen = ntohs(phdr->param_length);
4986		if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
4987			/* wacked parameter */
4988			SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
4989			goto invalid_size;
4990		}
4991		limit -= SCTP_SIZE32(plen);
4992		/*-
4993		 * All parameters for all chunks that we know/understand are
4994		 * listed here. We process them other places and make
4995		 * appropriate stop actions per the upper bits. However this
4996		 * is the generic routine processor's can call to get back
4997		 * an operr.. to either incorporate (init-ack) or send.
4998		 */
4999		padded_size = SCTP_SIZE32(plen);
5000		switch (ptype) {
5001			/* Param's with variable size */
5002		case SCTP_HEARTBEAT_INFO:
5003		case SCTP_STATE_COOKIE:
5004		case SCTP_UNRECOG_PARAM:
5005		case SCTP_ERROR_CAUSE_IND:
5006			/* ok skip fwd */
5007			at += padded_size;
5008			break;
5009			/* Param's with variable size within a range */
5010		case SCTP_CHUNK_LIST:
5011		case SCTP_SUPPORTED_CHUNK_EXT:
5012			if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
5013				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
5014				goto invalid_size;
5015			}
5016			at += padded_size;
5017			break;
5018		case SCTP_SUPPORTED_ADDRTYPE:
5019			if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
5020				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
5021				goto invalid_size;
5022			}
5023			at += padded_size;
5024			break;
5025		case SCTP_RANDOM:
5026			if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
5027				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
5028				goto invalid_size;
5029			}
5030			at += padded_size;
5031			break;
5032		case SCTP_SET_PRIM_ADDR:
5033		case SCTP_DEL_IP_ADDRESS:
5034		case SCTP_ADD_IP_ADDRESS:
5035			if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
5036			    (padded_size != sizeof(struct sctp_asconf_addr_param))) {
5037				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
5038				goto invalid_size;
5039			}
5040			at += padded_size;
5041			break;
5042			/* Param's with a fixed size */
5043		case SCTP_IPV4_ADDRESS:
5044			if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
5045				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
5046				goto invalid_size;
5047			}
5048			at += padded_size;
5049			break;
5050		case SCTP_IPV6_ADDRESS:
5051			if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
5052				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
5053				goto invalid_size;
5054			}
5055			at += padded_size;
5056			break;
5057		case SCTP_COOKIE_PRESERVE:
5058			if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
5059				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
5060				goto invalid_size;
5061			}
5062			at += padded_size;
5063			break;
5064		case SCTP_HAS_NAT_SUPPORT:
5065			*nat_friendly = 1;
5066			/* fall through */
5067		case SCTP_PRSCTP_SUPPORTED:
5068			if (padded_size != sizeof(struct sctp_paramhdr)) {
5069				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error prsctp/nat support %d\n", plen);
5070				goto invalid_size;
5071			}
5072			at += padded_size;
5073			break;
5074		case SCTP_ECN_CAPABLE:
5075			if (padded_size != sizeof(struct sctp_paramhdr)) {
5076				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
5077				goto invalid_size;
5078			}
5079			at += padded_size;
5080			break;
5081		case SCTP_ULP_ADAPTATION:
5082			if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
5083				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
5084				goto invalid_size;
5085			}
5086			at += padded_size;
5087			break;
5088		case SCTP_SUCCESS_REPORT:
5089			if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
5090				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
5091				goto invalid_size;
5092			}
5093			at += padded_size;
5094			break;
5095		case SCTP_HOSTNAME_ADDRESS:
5096			{
5097				/* We can NOT handle HOST NAME addresses!! */
5098				int l_len;
5099
5100				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
5101				*abort_processing = 1;
5102				if (op_err == NULL) {
5103					/* Ok need to try to get a mbuf */
5104#ifdef INET6
5105					l_len = SCTP_MIN_OVERHEAD;
5106#else
5107					l_len = SCTP_MIN_V4_OVERHEAD;
5108#endif
5109					l_len += sizeof(struct sctp_chunkhdr);
5110					l_len += plen;
5111					l_len += sizeof(struct sctp_paramhdr);
5112					op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5113					if (op_err) {
5114						SCTP_BUF_LEN(op_err) = 0;
5115						/*
5116						 * pre-reserve space for ip
5117						 * and sctp header  and
5118						 * chunk hdr
5119						 */
5120#ifdef INET6
5121						SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5122#else
5123						SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5124#endif
5125						SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5126						SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5127					}
5128				}
5129				if (op_err) {
5130					/* If we have space */
5131					struct sctp_paramhdr s;
5132
5133					if (err_at % 4) {
5134						uint32_t cpthis = 0;
5135
5136						pad_needed = 4 - (err_at % 4);
5137						m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5138						err_at += pad_needed;
5139					}
5140					s.param_type = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
5141					s.param_length = htons(sizeof(s) + plen);
5142					m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5143					err_at += sizeof(s);
5144					if (plen > sizeof(tempbuf)) {
5145						plen = sizeof(tempbuf);
5146					}
5147					phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, plen);
5148					if (phdr == NULL) {
5149						sctp_m_freem(op_err);
5150						/*
5151						 * we are out of memory but
5152						 * we still need to have a
5153						 * look at what to do (the
5154						 * system is in trouble
5155						 * though).
5156						 */
5157						return (NULL);
5158					}
5159					m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5160				}
5161				return (op_err);
5162				break;
5163			}
5164		default:
5165			/*
5166			 * we do not recognize the parameter figure out what
5167			 * we do.
5168			 */
5169			SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
5170			if ((ptype & 0x4000) == 0x4000) {
5171				/* Report bit is set?? */
5172				SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
5173				if (op_err == NULL) {
5174					int l_len;
5175
5176					/* Ok need to try to get an mbuf */
5177#ifdef INET6
5178					l_len = SCTP_MIN_OVERHEAD;
5179#else
5180					l_len = SCTP_MIN_V4_OVERHEAD;
5181#endif
5182					l_len += sizeof(struct sctp_chunkhdr);
5183					l_len += plen;
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					}
5196				}
5197				if (op_err) {
5198					/* If we have space */
5199					struct sctp_paramhdr s;
5200
5201					if (err_at % 4) {
5202						uint32_t cpthis = 0;
5203
5204						pad_needed = 4 - (err_at % 4);
5205						m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5206						err_at += pad_needed;
5207					}
5208					s.param_type = htons(SCTP_UNRECOG_PARAM);
5209					s.param_length = htons(sizeof(s) + plen);
5210					m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5211					err_at += sizeof(s);
5212					if (plen > sizeof(tempbuf)) {
5213						plen = sizeof(tempbuf);
5214					}
5215					phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, plen);
5216					if (phdr == NULL) {
5217						sctp_m_freem(op_err);
5218						/*
5219						 * we are out of memory but
5220						 * we still need to have a
5221						 * look at what to do (the
5222						 * system is in trouble
5223						 * though).
5224						 */
5225						op_err = NULL;
5226						goto more_processing;
5227					}
5228					m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5229					err_at += plen;
5230				}
5231			}
5232	more_processing:
5233			if ((ptype & 0x8000) == 0x0000) {
5234				SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
5235				return (op_err);
5236			} else {
5237				/* skip this chunk and continue processing */
5238				SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
5239				at += SCTP_SIZE32(plen);
5240			}
5241			break;
5242
5243		}
5244		phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
5245	}
5246	return (op_err);
5247invalid_size:
5248	SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
5249	*abort_processing = 1;
5250	if ((op_err == NULL) && phdr) {
5251		int l_len;
5252#ifdef INET6
5253		l_len = SCTP_MIN_OVERHEAD;
5254#else
5255		l_len = SCTP_MIN_V4_OVERHEAD;
5256#endif
5257		l_len += sizeof(struct sctp_chunkhdr);
5258		l_len += (2 * sizeof(struct sctp_paramhdr));
5259		op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5260		if (op_err) {
5261			SCTP_BUF_LEN(op_err) = 0;
5262#ifdef INET6
5263			SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5264#else
5265			SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5266#endif
5267			SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5268			SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5269		}
5270	}
5271	if ((op_err) && phdr) {
5272		struct sctp_paramhdr s;
5273
5274		if (err_at % 4) {
5275			uint32_t cpthis = 0;
5276
5277			pad_needed = 4 - (err_at % 4);
5278			m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5279			err_at += pad_needed;
5280		}
5281		s.param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
5282		s.param_length = htons(sizeof(s) + sizeof(struct sctp_paramhdr));
5283		m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5284		err_at += sizeof(s);
5285		/* Only copy back the p-hdr that caused the issue */
5286		m_copyback(op_err, err_at, sizeof(struct sctp_paramhdr), (caddr_t)phdr);
5287	}
5288	return (op_err);
5289}
5290
5291static int
5292sctp_are_there_new_addresses(struct sctp_association *asoc,
5293    struct mbuf *in_initpkt, int offset, struct sockaddr *src)
5294{
5295	/*
5296	 * Given a INIT packet, look through the packet to verify that there
5297	 * are NO new addresses. As we go through the parameters add reports
5298	 * of any un-understood parameters that require an error.  Also we
5299	 * must return (1) to drop the packet if we see a un-understood
5300	 * parameter that tells us to drop the chunk.
5301	 */
5302	struct sockaddr *sa_touse;
5303	struct sockaddr *sa;
5304	struct sctp_paramhdr *phdr, params;
5305	uint16_t ptype, plen;
5306	uint8_t fnd;
5307	struct sctp_nets *net;
5308	int check_src;
5309#ifdef INET
5310	struct sockaddr_in sin4, *sa4;
5311#endif
5312#ifdef INET6
5313	struct sockaddr_in6 sin6, *sa6;
5314#endif
5315
5316#ifdef INET
5317	memset(&sin4, 0, sizeof(sin4));
5318	sin4.sin_family = AF_INET;
5319	sin4.sin_len = sizeof(sin4);
5320#endif
5321#ifdef INET6
5322	memset(&sin6, 0, sizeof(sin6));
5323	sin6.sin6_family = AF_INET6;
5324	sin6.sin6_len = sizeof(sin6);
5325#endif
5326	/* First what about the src address of the pkt ? */
5327	check_src = 0;
5328	switch (src->sa_family) {
5329#ifdef INET
5330	case AF_INET:
5331		if (asoc->scope.ipv4_addr_legal) {
5332			check_src = 1;
5333		}
5334		break;
5335#endif
5336#ifdef INET6
5337	case AF_INET6:
5338		if (asoc->scope.ipv6_addr_legal) {
5339			check_src = 1;
5340		}
5341		break;
5342#endif
5343	default:
5344		/* TSNH */
5345		break;
5346	}
5347	if (check_src) {
5348		fnd = 0;
5349		TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5350			sa = (struct sockaddr *)&net->ro._l_addr;
5351			if (sa->sa_family == src->sa_family) {
5352#ifdef INET
5353				if (sa->sa_family == AF_INET) {
5354					struct sockaddr_in *src4;
5355
5356					sa4 = (struct sockaddr_in *)sa;
5357					src4 = (struct sockaddr_in *)src;
5358					if (sa4->sin_addr.s_addr == src4->sin_addr.s_addr) {
5359						fnd = 1;
5360						break;
5361					}
5362				}
5363#endif
5364#ifdef INET6
5365				if (sa->sa_family == AF_INET6) {
5366					struct sockaddr_in6 *src6;
5367
5368					sa6 = (struct sockaddr_in6 *)sa;
5369					src6 = (struct sockaddr_in6 *)src;
5370					if (SCTP6_ARE_ADDR_EQUAL(sa6, src6)) {
5371						fnd = 1;
5372						break;
5373					}
5374				}
5375#endif
5376			}
5377		}
5378		if (fnd == 0) {
5379			/* New address added! no need to look further. */
5380			return (1);
5381		}
5382	}
5383	/* Ok so far lets munge through the rest of the packet */
5384	offset += sizeof(struct sctp_init_chunk);
5385	phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5386	while (phdr) {
5387		sa_touse = NULL;
5388		ptype = ntohs(phdr->param_type);
5389		plen = ntohs(phdr->param_length);
5390		switch (ptype) {
5391#ifdef INET
5392		case SCTP_IPV4_ADDRESS:
5393			{
5394				struct sctp_ipv4addr_param *p4, p4_buf;
5395
5396				if (plen != sizeof(struct sctp_ipv4addr_param)) {
5397					return (1);
5398				}
5399				phdr = sctp_get_next_param(in_initpkt, offset,
5400				    (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
5401				if (phdr == NULL) {
5402					return (1);
5403				}
5404				if (asoc->scope.ipv4_addr_legal) {
5405					p4 = (struct sctp_ipv4addr_param *)phdr;
5406					sin4.sin_addr.s_addr = p4->addr;
5407					sa_touse = (struct sockaddr *)&sin4;
5408				}
5409				break;
5410			}
5411#endif
5412#ifdef INET6
5413		case SCTP_IPV6_ADDRESS:
5414			{
5415				struct sctp_ipv6addr_param *p6, p6_buf;
5416
5417				if (plen != sizeof(struct sctp_ipv6addr_param)) {
5418					return (1);
5419				}
5420				phdr = sctp_get_next_param(in_initpkt, offset,
5421				    (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
5422				if (phdr == NULL) {
5423					return (1);
5424				}
5425				if (asoc->scope.ipv6_addr_legal) {
5426					p6 = (struct sctp_ipv6addr_param *)phdr;
5427					memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
5428					    sizeof(p6->addr));
5429					sa_touse = (struct sockaddr *)&sin6;
5430				}
5431				break;
5432			}
5433#endif
5434		default:
5435			sa_touse = NULL;
5436			break;
5437		}
5438		if (sa_touse) {
5439			/* ok, sa_touse points to one to check */
5440			fnd = 0;
5441			TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5442				sa = (struct sockaddr *)&net->ro._l_addr;
5443				if (sa->sa_family != sa_touse->sa_family) {
5444					continue;
5445				}
5446#ifdef INET
5447				if (sa->sa_family == AF_INET) {
5448					sa4 = (struct sockaddr_in *)sa;
5449					if (sa4->sin_addr.s_addr ==
5450					    sin4.sin_addr.s_addr) {
5451						fnd = 1;
5452						break;
5453					}
5454				}
5455#endif
5456#ifdef INET6
5457				if (sa->sa_family == AF_INET6) {
5458					sa6 = (struct sockaddr_in6 *)sa;
5459					if (SCTP6_ARE_ADDR_EQUAL(
5460					    sa6, &sin6)) {
5461						fnd = 1;
5462						break;
5463					}
5464				}
5465#endif
5466			}
5467			if (!fnd) {
5468				/* New addr added! no need to look further */
5469				return (1);
5470			}
5471		}
5472		offset += SCTP_SIZE32(plen);
5473		phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5474	}
5475	return (0);
5476}
5477
5478/*
5479 * Given a MBUF chain that was sent into us containing an INIT. Build a
5480 * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
5481 * a pullup to include IPv6/4header, SCTP header and initial part of INIT
5482 * message (i.e. the struct sctp_init_msg).
5483 */
5484void
5485sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
5486    struct sctp_nets *src_net, struct mbuf *init_pkt,
5487    int iphlen, int offset,
5488    struct sockaddr *src, struct sockaddr *dst,
5489    struct sctphdr *sh, struct sctp_init_chunk *init_chk,
5490    uint8_t mflowtype, uint32_t mflowid,
5491    uint32_t vrf_id, uint16_t port, int hold_inp_lock)
5492{
5493	struct sctp_association *asoc;
5494	struct mbuf *m, *m_tmp, *m_last, *m_cookie, *op_err;
5495	struct sctp_init_ack_chunk *initack;
5496	struct sctp_adaptation_layer_indication *ali;
5497	struct sctp_supported_chunk_types_param *pr_supported;
5498	struct sctp_paramhdr *ph;
5499	union sctp_sockstore *over_addr;
5500	struct sctp_scoping scp;
5501#ifdef INET
5502	struct sockaddr_in *dst4 = (struct sockaddr_in *)dst;
5503	struct sockaddr_in *src4 = (struct sockaddr_in *)src;
5504	struct sockaddr_in *sin;
5505#endif
5506#ifdef INET6
5507	struct sockaddr_in6 *dst6 = (struct sockaddr_in6 *)dst;
5508	struct sockaddr_in6 *src6 = (struct sockaddr_in6 *)src;
5509	struct sockaddr_in6 *sin6;
5510#endif
5511	struct sockaddr *to;
5512	struct sctp_state_cookie stc;
5513	struct sctp_nets *net = NULL;
5514	uint8_t *signature = NULL;
5515	int cnt_inits_to = 0;
5516	uint16_t his_limit, i_want;
5517	int abort_flag;
5518	int nat_friendly = 0;
5519	int error;
5520	struct socket *so;
5521	uint16_t num_ext, chunk_len, padding_len, parameter_len;
5522
5523	if (stcb) {
5524		asoc = &stcb->asoc;
5525	} else {
5526		asoc = NULL;
5527	}
5528	if ((asoc != NULL) &&
5529	    (SCTP_GET_STATE(asoc) != SCTP_STATE_COOKIE_WAIT)) {
5530		if (sctp_are_there_new_addresses(asoc, init_pkt, offset, src)) {
5531			/*
5532			 * new addresses, out of here in non-cookie-wait
5533			 * states
5534			 *
5535			 * Send an ABORT, without the new address error
5536			 * cause. This looks no different than if no
5537			 * listener was present.
5538			 */
5539			op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5540			    "Address added");
5541			sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5542			    mflowtype, mflowid, inp->fibnum,
5543			    vrf_id, port);
5544			return;
5545		}
5546		if (src_net != NULL && (src_net->port != port)) {
5547			/*
5548			 * change of remote encapsulation port, out of here
5549			 * in non-cookie-wait states
5550			 *
5551			 * Send an ABORT, without an specific error cause.
5552			 * This looks no different than if no listener was
5553			 * present.
5554			 */
5555			op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5556			    "Remote encapsulation port changed");
5557			sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5558			    mflowtype, mflowid, inp->fibnum,
5559			    vrf_id, port);
5560			return;
5561		}
5562	}
5563	abort_flag = 0;
5564	op_err = sctp_arethere_unrecognized_parameters(init_pkt,
5565	    (offset + sizeof(struct sctp_init_chunk)),
5566	    &abort_flag, (struct sctp_chunkhdr *)init_chk, &nat_friendly);
5567	if (abort_flag) {
5568do_a_abort:
5569		if (op_err == NULL) {
5570			char msg[SCTP_DIAG_INFO_LEN];
5571
5572			snprintf(msg, sizeof(msg), "%s:%d at %s", __FILE__, __LINE__, __func__);
5573			op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5574			    msg);
5575		}
5576		sctp_send_abort(init_pkt, iphlen, src, dst, sh,
5577		    init_chk->init.initiate_tag, op_err,
5578		    mflowtype, mflowid, inp->fibnum,
5579		    vrf_id, port);
5580		return;
5581	}
5582	m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
5583	if (m == NULL) {
5584		/* No memory, INIT timer will re-attempt. */
5585		if (op_err)
5586			sctp_m_freem(op_err);
5587		return;
5588	}
5589	chunk_len = (uint16_t)sizeof(struct sctp_init_ack_chunk);
5590	padding_len = 0;
5591
5592	/*
5593	 * We might not overwrite the identification[] completely and on
5594	 * some platforms time_entered will contain some padding. Therefore
5595	 * zero out the cookie to avoid putting uninitialized memory on the
5596	 * wire.
5597	 */
5598	memset(&stc, 0, sizeof(struct sctp_state_cookie));
5599
5600	/* the time I built cookie */
5601	(void)SCTP_GETTIME_TIMEVAL(&stc.time_entered);
5602
5603	/* populate any tie tags */
5604	if (asoc != NULL) {
5605		/* unlock before tag selections */
5606		stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
5607		stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
5608		stc.cookie_life = asoc->cookie_life;
5609		net = asoc->primary_destination;
5610	} else {
5611		stc.tie_tag_my_vtag = 0;
5612		stc.tie_tag_peer_vtag = 0;
5613		/* life I will award this cookie */
5614		stc.cookie_life = inp->sctp_ep.def_cookie_life;
5615	}
5616
5617	/* copy in the ports for later check */
5618	stc.myport = sh->dest_port;
5619	stc.peerport = sh->src_port;
5620
5621	/*
5622	 * If we wanted to honor cookie life extensions, we would add to
5623	 * stc.cookie_life. For now we should NOT honor any extension
5624	 */
5625	stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
5626	if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5627		stc.ipv6_addr_legal = 1;
5628		if (SCTP_IPV6_V6ONLY(inp)) {
5629			stc.ipv4_addr_legal = 0;
5630		} else {
5631			stc.ipv4_addr_legal = 1;
5632		}
5633	} else {
5634		stc.ipv6_addr_legal = 0;
5635		stc.ipv4_addr_legal = 1;
5636	}
5637	stc.ipv4_scope = 0;
5638	if (net == NULL) {
5639		to = src;
5640		switch (dst->sa_family) {
5641#ifdef INET
5642		case AF_INET:
5643			{
5644				/* lookup address */
5645				stc.address[0] = src4->sin_addr.s_addr;
5646				stc.address[1] = 0;
5647				stc.address[2] = 0;
5648				stc.address[3] = 0;
5649				stc.addr_type = SCTP_IPV4_ADDRESS;
5650				/* local from address */
5651				stc.laddress[0] = dst4->sin_addr.s_addr;
5652				stc.laddress[1] = 0;
5653				stc.laddress[2] = 0;
5654				stc.laddress[3] = 0;
5655				stc.laddr_type = SCTP_IPV4_ADDRESS;
5656				/* scope_id is only for v6 */
5657				stc.scope_id = 0;
5658				if ((IN4_ISPRIVATE_ADDRESS(&src4->sin_addr)) ||
5659				    (IN4_ISPRIVATE_ADDRESS(&dst4->sin_addr))) {
5660					stc.ipv4_scope = 1;
5661				}
5662				/* Must use the address in this case */
5663				if (sctp_is_address_on_local_host(src, vrf_id)) {
5664					stc.loopback_scope = 1;
5665					stc.ipv4_scope = 1;
5666					stc.site_scope = 1;
5667					stc.local_scope = 0;
5668				}
5669				break;
5670			}
5671#endif
5672#ifdef INET6
5673		case AF_INET6:
5674			{
5675				stc.addr_type = SCTP_IPV6_ADDRESS;
5676				memcpy(&stc.address, &src6->sin6_addr, sizeof(struct in6_addr));
5677				stc.scope_id = ntohs(in6_getscope(&src6->sin6_addr));
5678				if (sctp_is_address_on_local_host(src, vrf_id)) {
5679					stc.loopback_scope = 1;
5680					stc.local_scope = 0;
5681					stc.site_scope = 1;
5682					stc.ipv4_scope = 1;
5683				} else if (IN6_IS_ADDR_LINKLOCAL(&src6->sin6_addr) ||
5684				    IN6_IS_ADDR_LINKLOCAL(&dst6->sin6_addr)) {
5685					/*
5686					 * If the new destination or source
5687					 * is a LINK_LOCAL we must have
5688					 * common both site and local scope.
5689					 * Don't set local scope though
5690					 * since we must depend on the
5691					 * source to be added implicitly. We
5692					 * cannot assure just because we
5693					 * share one link that all links are
5694					 * common.
5695					 */
5696					stc.local_scope = 0;
5697					stc.site_scope = 1;
5698					stc.ipv4_scope = 1;
5699					/*
5700					 * we start counting for the private
5701					 * address stuff at 1. since the
5702					 * link local we source from won't
5703					 * show up in our scoped count.
5704					 */
5705					cnt_inits_to = 1;
5706					/*
5707					 * pull out the scope_id from
5708					 * incoming pkt
5709					 */
5710				} else if (IN6_IS_ADDR_SITELOCAL(&src6->sin6_addr) ||
5711				    IN6_IS_ADDR_SITELOCAL(&dst6->sin6_addr)) {
5712					/*
5713					 * If the new destination or source
5714					 * is SITE_LOCAL then we must have
5715					 * site scope in common.
5716					 */
5717					stc.site_scope = 1;
5718				}
5719				memcpy(&stc.laddress, &dst6->sin6_addr, sizeof(struct in6_addr));
5720				stc.laddr_type = SCTP_IPV6_ADDRESS;
5721				break;
5722			}
5723#endif
5724		default:
5725			/* TSNH */
5726			goto do_a_abort;
5727			break;
5728		}
5729	} else {
5730		/* set the scope per the existing tcb */
5731
5732#ifdef INET6
5733		struct sctp_nets *lnet;
5734#endif
5735
5736		stc.loopback_scope = asoc->scope.loopback_scope;
5737		stc.ipv4_scope = asoc->scope.ipv4_local_scope;
5738		stc.site_scope = asoc->scope.site_scope;
5739		stc.local_scope = asoc->scope.local_scope;
5740#ifdef INET6
5741		/* Why do we not consider IPv4 LL addresses? */
5742		TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
5743			if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
5744				if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
5745					/*
5746					 * if we have a LL address, start
5747					 * counting at 1.
5748					 */
5749					cnt_inits_to = 1;
5750				}
5751			}
5752		}
5753#endif
5754		/* use the net pointer */
5755		to = (struct sockaddr *)&net->ro._l_addr;
5756		switch (to->sa_family) {
5757#ifdef INET
5758		case AF_INET:
5759			sin = (struct sockaddr_in *)to;
5760			stc.address[0] = sin->sin_addr.s_addr;
5761			stc.address[1] = 0;
5762			stc.address[2] = 0;
5763			stc.address[3] = 0;
5764			stc.addr_type = SCTP_IPV4_ADDRESS;
5765			if (net->src_addr_selected == 0) {
5766				/*
5767				 * strange case here, the INIT should have
5768				 * did the selection.
5769				 */
5770				net->ro._s_addr = sctp_source_address_selection(inp,
5771				    stcb, (sctp_route_t *)&net->ro,
5772				    net, 0, vrf_id);
5773				if (net->ro._s_addr == NULL)
5774					return;
5775
5776				net->src_addr_selected = 1;
5777
5778			}
5779			stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
5780			stc.laddress[1] = 0;
5781			stc.laddress[2] = 0;
5782			stc.laddress[3] = 0;
5783			stc.laddr_type = SCTP_IPV4_ADDRESS;
5784			/* scope_id is only for v6 */
5785			stc.scope_id = 0;
5786			break;
5787#endif
5788#ifdef INET6
5789		case AF_INET6:
5790			sin6 = (struct sockaddr_in6 *)to;
5791			memcpy(&stc.address, &sin6->sin6_addr,
5792			    sizeof(struct in6_addr));
5793			stc.addr_type = SCTP_IPV6_ADDRESS;
5794			stc.scope_id = sin6->sin6_scope_id;
5795			if (net->src_addr_selected == 0) {
5796				/*
5797				 * strange case here, the INIT should have
5798				 * done the selection.
5799				 */
5800				net->ro._s_addr = sctp_source_address_selection(inp,
5801				    stcb, (sctp_route_t *)&net->ro,
5802				    net, 0, vrf_id);
5803				if (net->ro._s_addr == NULL)
5804					return;
5805
5806				net->src_addr_selected = 1;
5807			}
5808			memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
5809			    sizeof(struct in6_addr));
5810			stc.laddr_type = SCTP_IPV6_ADDRESS;
5811			break;
5812#endif
5813		}
5814	}
5815	/* Now lets put the SCTP header in place */
5816	initack = mtod(m, struct sctp_init_ack_chunk *);
5817	/* Save it off for quick ref */
5818	stc.peers_vtag = ntohl(init_chk->init.initiate_tag);
5819	/* who are we */
5820	memcpy(stc.identification, SCTP_VERSION_STRING,
5821	    min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
5822	memset(stc.reserved, 0, SCTP_RESERVE_SPACE);
5823	/* now the chunk header */
5824	initack->ch.chunk_type = SCTP_INITIATION_ACK;
5825	initack->ch.chunk_flags = 0;
5826	/* fill in later from mbuf we build */
5827	initack->ch.chunk_length = 0;
5828	/* place in my tag */
5829	if ((asoc != NULL) &&
5830	    ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
5831	    (SCTP_GET_STATE(asoc) == SCTP_STATE_INUSE) ||
5832	    (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED))) {
5833		/* re-use the v-tags and init-seq here */
5834		initack->init.initiate_tag = htonl(asoc->my_vtag);
5835		initack->init.initial_tsn = htonl(asoc->init_seq_number);
5836	} else {
5837		uint32_t vtag, itsn;
5838
5839		if (hold_inp_lock) {
5840			SCTP_INP_INCR_REF(inp);
5841			SCTP_INP_RUNLOCK(inp);
5842		}
5843		if (asoc) {
5844			atomic_add_int(&asoc->refcnt, 1);
5845			SCTP_TCB_UNLOCK(stcb);
5846	new_tag:
5847			vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5848			if ((asoc->peer_supports_nat) && (vtag == asoc->my_vtag)) {
5849				/*
5850				 * Got a duplicate vtag on some guy behind a
5851				 * nat make sure we don't use it.
5852				 */
5853				goto new_tag;
5854			}
5855			initack->init.initiate_tag = htonl(vtag);
5856			/* get a TSN to use too */
5857			itsn = sctp_select_initial_TSN(&inp->sctp_ep);
5858			initack->init.initial_tsn = htonl(itsn);
5859			SCTP_TCB_LOCK(stcb);
5860			atomic_add_int(&asoc->refcnt, -1);
5861		} else {
5862			vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5863			initack->init.initiate_tag = htonl(vtag);
5864			/* get a TSN to use too */
5865			initack->init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
5866		}
5867		if (hold_inp_lock) {
5868			SCTP_INP_RLOCK(inp);
5869			SCTP_INP_DECR_REF(inp);
5870		}
5871	}
5872	/* save away my tag to */
5873	stc.my_vtag = initack->init.initiate_tag;
5874
5875	/* set up some of the credits. */
5876	so = inp->sctp_socket;
5877	if (so == NULL) {
5878		/* memory problem */
5879		sctp_m_freem(m);
5880		return;
5881	} else {
5882		initack->init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
5883	}
5884	/* set what I want */
5885	his_limit = ntohs(init_chk->init.num_inbound_streams);
5886	/* choose what I want */
5887	if (asoc != NULL) {
5888		if (asoc->streamoutcnt > asoc->pre_open_streams) {
5889			i_want = asoc->streamoutcnt;
5890		} else {
5891			i_want = asoc->pre_open_streams;
5892		}
5893	} else {
5894		i_want = inp->sctp_ep.pre_open_stream_count;
5895	}
5896	if (his_limit < i_want) {
5897		/* I Want more :< */
5898		initack->init.num_outbound_streams = init_chk->init.num_inbound_streams;
5899	} else {
5900		/* I can have what I want :> */
5901		initack->init.num_outbound_streams = htons(i_want);
5902	}
5903	/* tell him his limit. */
5904	initack->init.num_inbound_streams =
5905	    htons(inp->sctp_ep.max_open_streams_intome);
5906
5907	/* adaptation layer indication parameter */
5908	if (inp->sctp_ep.adaptation_layer_indicator_provided) {
5909		parameter_len = (uint16_t)sizeof(struct sctp_adaptation_layer_indication);
5910		ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
5911		ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
5912		ali->ph.param_length = htons(parameter_len);
5913		ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
5914		chunk_len += parameter_len;
5915	}
5916	/* ECN parameter */
5917	if (((asoc != NULL) && (asoc->ecn_supported == 1)) ||
5918	    ((asoc == NULL) && (inp->ecn_supported == 1))) {
5919		parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5920		ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5921		ph->param_type = htons(SCTP_ECN_CAPABLE);
5922		ph->param_length = htons(parameter_len);
5923		chunk_len += parameter_len;
5924	}
5925	/* PR-SCTP supported parameter */
5926	if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5927	    ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5928		parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5929		ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5930		ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
5931		ph->param_length = htons(parameter_len);
5932		chunk_len += parameter_len;
5933	}
5934	/* Add NAT friendly parameter */
5935	if (nat_friendly) {
5936		parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5937		ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5938		ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
5939		ph->param_length = htons(parameter_len);
5940		chunk_len += parameter_len;
5941	}
5942	/* And now tell the peer which extensions we support */
5943	num_ext = 0;
5944	pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
5945	if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5946	    ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5947		pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
5948		if (((asoc != NULL) && (asoc->idata_supported == 1)) ||
5949		    ((asoc == NULL) && (inp->idata_supported == 1))) {
5950			pr_supported->chunk_types[num_ext++] = SCTP_IFORWARD_CUM_TSN;
5951		}
5952	}
5953	if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
5954	    ((asoc == NULL) && (inp->auth_supported == 1))) {
5955		pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
5956	}
5957	if (((asoc != NULL) && (asoc->asconf_supported == 1)) ||
5958	    ((asoc == NULL) && (inp->asconf_supported == 1))) {
5959		pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
5960		pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
5961	}
5962	if (((asoc != NULL) && (asoc->reconfig_supported == 1)) ||
5963	    ((asoc == NULL) && (inp->reconfig_supported == 1))) {
5964		pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
5965	}
5966	if (((asoc != NULL) && (asoc->idata_supported == 1)) ||
5967	    ((asoc == NULL) && (inp->idata_supported == 1))) {
5968		pr_supported->chunk_types[num_ext++] = SCTP_IDATA;
5969	}
5970	if (((asoc != NULL) && (asoc->nrsack_supported == 1)) ||
5971	    ((asoc == NULL) && (inp->nrsack_supported == 1))) {
5972		pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
5973	}
5974	if (((asoc != NULL) && (asoc->pktdrop_supported == 1)) ||
5975	    ((asoc == NULL) && (inp->pktdrop_supported == 1))) {
5976		pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
5977	}
5978	if (num_ext > 0) {
5979		parameter_len = (uint16_t)sizeof(struct sctp_supported_chunk_types_param) + num_ext;
5980		pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
5981		pr_supported->ph.param_length = htons(parameter_len);
5982		padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
5983		chunk_len += parameter_len;
5984	}
5985	/* add authentication parameters */
5986	if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
5987	    ((asoc == NULL) && (inp->auth_supported == 1))) {
5988		struct sctp_auth_random *randp;
5989		struct sctp_auth_hmac_algo *hmacs;
5990		struct sctp_auth_chunk_list *chunks;
5991
5992		if (padding_len > 0) {
5993			memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
5994			chunk_len += padding_len;
5995			padding_len = 0;
5996		}
5997		/* generate and add RANDOM parameter */
5998		randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
5999		parameter_len = (uint16_t)sizeof(struct sctp_auth_random) +
6000		    SCTP_AUTH_RANDOM_SIZE_DEFAULT;
6001		randp->ph.param_type = htons(SCTP_RANDOM);
6002		randp->ph.param_length = htons(parameter_len);
6003		SCTP_READ_RANDOM(randp->random_data, SCTP_AUTH_RANDOM_SIZE_DEFAULT);
6004		padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6005		chunk_len += parameter_len;
6006
6007		if (padding_len > 0) {
6008			memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6009			chunk_len += padding_len;
6010			padding_len = 0;
6011		}
6012		/* add HMAC_ALGO parameter */
6013		hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
6014		parameter_len = (uint16_t)sizeof(struct sctp_auth_hmac_algo) +
6015		    sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
6016		    (uint8_t *)hmacs->hmac_ids);
6017		hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
6018		hmacs->ph.param_length = htons(parameter_len);
6019		padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6020		chunk_len += parameter_len;
6021
6022		if (padding_len > 0) {
6023			memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6024			chunk_len += padding_len;
6025			padding_len = 0;
6026		}
6027		/* add CHUNKS parameter */
6028		chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
6029		parameter_len = (uint16_t)sizeof(struct sctp_auth_chunk_list) +
6030		    sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
6031		    chunks->chunk_types);
6032		chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
6033		chunks->ph.param_length = htons(parameter_len);
6034		padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6035		chunk_len += parameter_len;
6036	}
6037	SCTP_BUF_LEN(m) = chunk_len;
6038	m_last = m;
6039	/* now the addresses */
6040	/*
6041	 * To optimize this we could put the scoping stuff into a structure
6042	 * and remove the individual uint8's from the stc structure. Then we
6043	 * could just sifa in the address within the stc.. but for now this
6044	 * is a quick hack to get the address stuff teased apart.
6045	 */
6046	scp.ipv4_addr_legal = stc.ipv4_addr_legal;
6047	scp.ipv6_addr_legal = stc.ipv6_addr_legal;
6048	scp.loopback_scope = stc.loopback_scope;
6049	scp.ipv4_local_scope = stc.ipv4_scope;
6050	scp.local_scope = stc.local_scope;
6051	scp.site_scope = stc.site_scope;
6052	m_last = sctp_add_addresses_to_i_ia(inp, stcb, &scp, m_last,
6053	    cnt_inits_to,
6054	    &padding_len, &chunk_len);
6055	/* padding_len can only be positive, if no addresses have been added */
6056	if (padding_len > 0) {
6057		memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6058		chunk_len += padding_len;
6059		SCTP_BUF_LEN(m) += padding_len;
6060		padding_len = 0;
6061	}
6062	/* tack on the operational error if present */
6063	if (op_err) {
6064		parameter_len = 0;
6065		for (m_tmp = op_err; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6066			parameter_len += SCTP_BUF_LEN(m_tmp);
6067		}
6068		padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6069		SCTP_BUF_NEXT(m_last) = op_err;
6070		while (SCTP_BUF_NEXT(m_last) != NULL) {
6071			m_last = SCTP_BUF_NEXT(m_last);
6072		}
6073		chunk_len += parameter_len;
6074	}
6075	if (padding_len > 0) {
6076		m_last = sctp_add_pad_tombuf(m_last, padding_len);
6077		if (m_last == NULL) {
6078			/* Houston we have a problem, no space */
6079			sctp_m_freem(m);
6080			return;
6081		}
6082		chunk_len += padding_len;
6083		padding_len = 0;
6084	}
6085	/* Now we must build a cookie */
6086	m_cookie = sctp_add_cookie(init_pkt, offset, m, 0, &stc, &signature);
6087	if (m_cookie == NULL) {
6088		/* memory problem */
6089		sctp_m_freem(m);
6090		return;
6091	}
6092	/* Now append the cookie to the end and update the space/size */
6093	SCTP_BUF_NEXT(m_last) = m_cookie;
6094	parameter_len = 0;
6095	for (m_tmp = m_cookie; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6096		parameter_len += SCTP_BUF_LEN(m_tmp);
6097		if (SCTP_BUF_NEXT(m_tmp) == NULL) {
6098			m_last = m_tmp;
6099		}
6100	}
6101	padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6102	chunk_len += parameter_len;
6103
6104	/*
6105	 * Place in the size, but we don't include the last pad (if any) in
6106	 * the INIT-ACK.
6107	 */
6108	initack->ch.chunk_length = htons(chunk_len);
6109
6110	/*
6111	 * Time to sign the cookie, we don't sign over the cookie signature
6112	 * though thus we set trailer.
6113	 */
6114	(void)sctp_hmac_m(SCTP_HMAC,
6115	    (uint8_t *)inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
6116	    SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
6117	    (uint8_t *)signature, SCTP_SIGNATURE_SIZE);
6118	/*
6119	 * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
6120	 * here since the timer will drive a retranmission.
6121	 */
6122	if (padding_len > 0) {
6123		if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
6124			sctp_m_freem(m);
6125			return;
6126		}
6127	}
6128	if (stc.loopback_scope) {
6129		over_addr = (union sctp_sockstore *)dst;
6130	} else {
6131		over_addr = NULL;
6132	}
6133
6134	if ((error = sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
6135	    0, 0,
6136	    inp->sctp_lport, sh->src_port, init_chk->init.initiate_tag,
6137	    port, over_addr,
6138	    mflowtype, mflowid,
6139	    SCTP_SO_NOT_LOCKED))) {
6140		SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak send error %d\n", error);
6141		if (error == ENOBUFS) {
6142			if (asoc != NULL) {
6143				asoc->ifp_had_enobuf = 1;
6144			}
6145			SCTP_STAT_INCR(sctps_lowlevelerr);
6146		}
6147	} else {
6148		if (asoc != NULL) {
6149			asoc->ifp_had_enobuf = 0;
6150		}
6151	}
6152	SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
6153}
6154
6155
6156static void
6157sctp_prune_prsctp(struct sctp_tcb *stcb,
6158    struct sctp_association *asoc,
6159    struct sctp_sndrcvinfo *srcv,
6160    int dataout)
6161{
6162	int freed_spc = 0;
6163	struct sctp_tmit_chunk *chk, *nchk;
6164
6165	SCTP_TCB_LOCK_ASSERT(stcb);
6166	if ((asoc->prsctp_supported) &&
6167	    (asoc->sent_queue_cnt_removeable > 0)) {
6168		TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
6169			/*
6170			 * Look for chunks marked with the PR_SCTP flag AND
6171			 * the buffer space flag. If the one being sent is
6172			 * equal or greater priority then purge the old one
6173			 * and free some space.
6174			 */
6175			if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6176				/*
6177				 * This one is PR-SCTP AND buffer space
6178				 * limited type
6179				 */
6180				if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6181					/*
6182					 * Lower numbers equates to higher
6183					 * priority so if the one we are
6184					 * looking at has a larger or equal
6185					 * priority we want to drop the data
6186					 * and NOT retransmit it.
6187					 */
6188					if (chk->data) {
6189						/*
6190						 * We release the book_size
6191						 * if the mbuf is here
6192						 */
6193						int ret_spc;
6194						uint8_t sent;
6195
6196						if (chk->sent > SCTP_DATAGRAM_UNSENT)
6197							sent = 1;
6198						else
6199							sent = 0;
6200						ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6201						    sent,
6202						    SCTP_SO_LOCKED);
6203						freed_spc += ret_spc;
6204						if (freed_spc >= dataout) {
6205							return;
6206						}
6207					}	/* if chunk was present */
6208				}	/* if of sufficient priority */
6209			}	/* if chunk has enabled */
6210		}		/* tailqforeach */
6211
6212		TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
6213			/* Here we must move to the sent queue and mark */
6214			if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6215				if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6216					if (chk->data) {
6217						/*
6218						 * We release the book_size
6219						 * if the mbuf is here
6220						 */
6221						int ret_spc;
6222
6223						ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6224						    0, SCTP_SO_LOCKED);
6225
6226						freed_spc += ret_spc;
6227						if (freed_spc >= dataout) {
6228							return;
6229						}
6230					}	/* end if chk->data */
6231				}	/* end if right class */
6232			}	/* end if chk pr-sctp */
6233		}		/* tailqforeachsafe (chk) */
6234	}			/* if enabled in asoc */
6235}
6236
6237int
6238sctp_get_frag_point(struct sctp_tcb *stcb,
6239    struct sctp_association *asoc)
6240{
6241	int siz, ovh;
6242
6243	/*
6244	 * For endpoints that have both v6 and v4 addresses we must reserve
6245	 * room for the ipv6 header, for those that are only dealing with V4
6246	 * we use a larger frag point.
6247	 */
6248	if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
6249		ovh = SCTP_MIN_OVERHEAD;
6250	} else {
6251		ovh = SCTP_MIN_V4_OVERHEAD;
6252	}
6253	if (stcb->asoc.idata_supported) {
6254		ovh += sizeof(struct sctp_idata_chunk);
6255	} else {
6256		ovh += sizeof(struct sctp_data_chunk);
6257	}
6258	if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
6259		siz = asoc->smallest_mtu - ovh;
6260	else
6261		siz = (stcb->asoc.sctp_frag_point - ovh);
6262	/*
6263	 * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
6264	 */
6265	/* A data chunk MUST fit in a cluster */
6266	/* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
6267	/* } */
6268
6269	/* adjust for an AUTH chunk if DATA requires auth */
6270	if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
6271		siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
6272
6273	if (siz % 4) {
6274		/* make it an even word boundary please */
6275		siz -= (siz % 4);
6276	}
6277	return (siz);
6278}
6279
6280static void
6281sctp_set_prsctp_policy(struct sctp_stream_queue_pending *sp)
6282{
6283	/*
6284	 * We assume that the user wants PR_SCTP_TTL if the user provides a
6285	 * positive lifetime but does not specify any PR_SCTP policy.
6286	 */
6287	if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
6288		sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6289	} else if (sp->timetolive > 0) {
6290		sp->sinfo_flags |= SCTP_PR_SCTP_TTL;
6291		sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6292	} else {
6293		return;
6294	}
6295	switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
6296	case CHUNK_FLAGS_PR_SCTP_BUF:
6297		/*
6298		 * Time to live is a priority stored in tv_sec when doing
6299		 * the buffer drop thing.
6300		 */
6301		sp->ts.tv_sec = sp->timetolive;
6302		sp->ts.tv_usec = 0;
6303		break;
6304	case CHUNK_FLAGS_PR_SCTP_TTL:
6305		{
6306			struct timeval tv;
6307
6308			(void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6309			tv.tv_sec = sp->timetolive / 1000;
6310			tv.tv_usec = (sp->timetolive * 1000) % 1000000;
6311			/*
6312			 * TODO sctp_constants.h needs alternative time
6313			 * macros when _KERNEL is undefined.
6314			 */
6315			timevaladd(&sp->ts, &tv);
6316		}
6317		break;
6318	case CHUNK_FLAGS_PR_SCTP_RTX:
6319		/*
6320		 * Time to live is a the number or retransmissions stored in
6321		 * tv_sec.
6322		 */
6323		sp->ts.tv_sec = sp->timetolive;
6324		sp->ts.tv_usec = 0;
6325		break;
6326	default:
6327		SCTPDBG(SCTP_DEBUG_USRREQ1,
6328		    "Unknown PR_SCTP policy %u.\n",
6329		    PR_SCTP_POLICY(sp->sinfo_flags));
6330		break;
6331	}
6332}
6333
6334static int
6335sctp_msg_append(struct sctp_tcb *stcb,
6336    struct sctp_nets *net,
6337    struct mbuf *m,
6338    struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
6339{
6340	int error = 0;
6341	struct mbuf *at;
6342	struct sctp_stream_queue_pending *sp = NULL;
6343	struct sctp_stream_out *strm;
6344
6345	/*
6346	 * Given an mbuf chain, put it into the association send queue and
6347	 * place it on the wheel
6348	 */
6349	if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
6350		/* Invalid stream number */
6351		SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6352		error = EINVAL;
6353		goto out_now;
6354	}
6355	if ((stcb->asoc.stream_locked) &&
6356	    (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
6357		SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6358		error = EINVAL;
6359		goto out_now;
6360	}
6361	strm = &stcb->asoc.strmout[srcv->sinfo_stream];
6362	/* Now can we send this? */
6363	if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
6364	    (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
6365	    (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
6366	    (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
6367		/* got data while shutting down */
6368		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
6369		error = ECONNRESET;
6370		goto out_now;
6371	}
6372	sctp_alloc_a_strmoq(stcb, sp);
6373	if (sp == NULL) {
6374		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6375		error = ENOMEM;
6376		goto out_now;
6377	}
6378	sp->sinfo_flags = srcv->sinfo_flags;
6379	sp->timetolive = srcv->sinfo_timetolive;
6380	sp->ppid = srcv->sinfo_ppid;
6381	sp->context = srcv->sinfo_context;
6382	sp->fsn = 0;
6383	if (sp->sinfo_flags & SCTP_ADDR_OVER) {
6384		sp->net = net;
6385		atomic_add_int(&sp->net->ref_count, 1);
6386	} else {
6387		sp->net = NULL;
6388	}
6389	(void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6390	sp->sid = srcv->sinfo_stream;
6391	sp->msg_is_complete = 1;
6392	sp->sender_all_done = 1;
6393	sp->some_taken = 0;
6394	sp->data = m;
6395	sp->tail_mbuf = NULL;
6396	sctp_set_prsctp_policy(sp);
6397	/*
6398	 * We could in theory (for sendall) sifa the length in, but we would
6399	 * still have to hunt through the chain since we need to setup the
6400	 * tail_mbuf
6401	 */
6402	sp->length = 0;
6403	for (at = m; at; at = SCTP_BUF_NEXT(at)) {
6404		if (SCTP_BUF_NEXT(at) == NULL)
6405			sp->tail_mbuf = at;
6406		sp->length += SCTP_BUF_LEN(at);
6407	}
6408	if (srcv->sinfo_keynumber_valid) {
6409		sp->auth_keyid = srcv->sinfo_keynumber;
6410	} else {
6411		sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
6412	}
6413	if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
6414		sctp_auth_key_acquire(stcb, sp->auth_keyid);
6415		sp->holds_key_ref = 1;
6416	}
6417	if (hold_stcb_lock == 0) {
6418		SCTP_TCB_SEND_LOCK(stcb);
6419	}
6420	sctp_snd_sb_alloc(stcb, sp->length);
6421	atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
6422	TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
6423	stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, &stcb->asoc, strm, sp, 1);
6424	m = NULL;
6425	if (hold_stcb_lock == 0) {
6426		SCTP_TCB_SEND_UNLOCK(stcb);
6427	}
6428out_now:
6429	if (m) {
6430		sctp_m_freem(m);
6431	}
6432	return (error);
6433}
6434
6435
6436static struct mbuf *
6437sctp_copy_mbufchain(struct mbuf *clonechain,
6438    struct mbuf *outchain,
6439    struct mbuf **endofchain,
6440    int can_take_mbuf,
6441    int sizeofcpy,
6442    uint8_t copy_by_ref)
6443{
6444	struct mbuf *m;
6445	struct mbuf *appendchain;
6446	caddr_t cp;
6447	int len;
6448
6449	if (endofchain == NULL) {
6450		/* error */
6451error_out:
6452		if (outchain)
6453			sctp_m_freem(outchain);
6454		return (NULL);
6455	}
6456	if (can_take_mbuf) {
6457		appendchain = clonechain;
6458	} else {
6459		if (!copy_by_ref &&
6460		    (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))
6461		    ) {
6462			/* Its not in a cluster */
6463			if (*endofchain == NULL) {
6464				/* lets get a mbuf cluster */
6465				if (outchain == NULL) {
6466					/* This is the general case */
6467			new_mbuf:
6468					outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6469					if (outchain == NULL) {
6470						goto error_out;
6471					}
6472					SCTP_BUF_LEN(outchain) = 0;
6473					*endofchain = outchain;
6474					/* get the prepend space */
6475					SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
6476				} else {
6477					/*
6478					 * We really should not get a NULL
6479					 * in endofchain
6480					 */
6481					/* find end */
6482					m = outchain;
6483					while (m) {
6484						if (SCTP_BUF_NEXT(m) == NULL) {
6485							*endofchain = m;
6486							break;
6487						}
6488						m = SCTP_BUF_NEXT(m);
6489					}
6490					/* sanity */
6491					if (*endofchain == NULL) {
6492						/*
6493						 * huh, TSNH XXX maybe we
6494						 * should panic
6495						 */
6496						sctp_m_freem(outchain);
6497						goto new_mbuf;
6498					}
6499				}
6500				/* get the new end of length */
6501				len = (int)M_TRAILINGSPACE(*endofchain);
6502			} else {
6503				/* how much is left at the end? */
6504				len = (int)M_TRAILINGSPACE(*endofchain);
6505			}
6506			/* Find the end of the data, for appending */
6507			cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
6508
6509			/* Now lets copy it out */
6510			if (len >= sizeofcpy) {
6511				/* It all fits, copy it in */
6512				m_copydata(clonechain, 0, sizeofcpy, cp);
6513				SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6514			} else {
6515				/* fill up the end of the chain */
6516				if (len > 0) {
6517					m_copydata(clonechain, 0, len, cp);
6518					SCTP_BUF_LEN((*endofchain)) += len;
6519					/* now we need another one */
6520					sizeofcpy -= len;
6521				}
6522				m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6523				if (m == NULL) {
6524					/* We failed */
6525					goto error_out;
6526				}
6527				SCTP_BUF_NEXT((*endofchain)) = m;
6528				*endofchain = m;
6529				cp = mtod((*endofchain), caddr_t);
6530				m_copydata(clonechain, len, sizeofcpy, cp);
6531				SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6532			}
6533			return (outchain);
6534		} else {
6535			/* copy the old fashion way */
6536			appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_NOWAIT);
6537#ifdef SCTP_MBUF_LOGGING
6538			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6539				sctp_log_mbc(appendchain, SCTP_MBUF_ICOPY);
6540			}
6541#endif
6542		}
6543	}
6544	if (appendchain == NULL) {
6545		/* error */
6546		if (outchain)
6547			sctp_m_freem(outchain);
6548		return (NULL);
6549	}
6550	if (outchain) {
6551		/* tack on to the end */
6552		if (*endofchain != NULL) {
6553			SCTP_BUF_NEXT(((*endofchain))) = appendchain;
6554		} else {
6555			m = outchain;
6556			while (m) {
6557				if (SCTP_BUF_NEXT(m) == NULL) {
6558					SCTP_BUF_NEXT(m) = appendchain;
6559					break;
6560				}
6561				m = SCTP_BUF_NEXT(m);
6562			}
6563		}
6564		/*
6565		 * save off the end and update the end-chain position
6566		 */
6567		m = appendchain;
6568		while (m) {
6569			if (SCTP_BUF_NEXT(m) == NULL) {
6570				*endofchain = m;
6571				break;
6572			}
6573			m = SCTP_BUF_NEXT(m);
6574		}
6575		return (outchain);
6576	} else {
6577		/* save off the end and update the end-chain position */
6578		m = appendchain;
6579		while (m) {
6580			if (SCTP_BUF_NEXT(m) == NULL) {
6581				*endofchain = m;
6582				break;
6583			}
6584			m = SCTP_BUF_NEXT(m);
6585		}
6586		return (appendchain);
6587	}
6588}
6589
6590static int
6591sctp_med_chunk_output(struct sctp_inpcb *inp,
6592    struct sctp_tcb *stcb,
6593    struct sctp_association *asoc,
6594    int *num_out,
6595    int *reason_code,
6596    int control_only, int from_where,
6597    struct timeval *now, int *now_filled, int frag_point, int so_locked
6598#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6599    SCTP_UNUSED
6600#endif
6601);
6602
6603static void
6604sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
6605    uint32_t val SCTP_UNUSED)
6606{
6607	struct sctp_copy_all *ca;
6608	struct mbuf *m;
6609	int ret = 0;
6610	int added_control = 0;
6611	int un_sent, do_chunk_output = 1;
6612	struct sctp_association *asoc;
6613	struct sctp_nets *net;
6614
6615	ca = (struct sctp_copy_all *)ptr;
6616	if (ca->m == NULL) {
6617		return;
6618	}
6619	if (ca->inp != inp) {
6620		/* TSNH */
6621		return;
6622	}
6623	if (ca->sndlen > 0) {
6624		m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_NOWAIT);
6625		if (m == NULL) {
6626			/* can't copy so we are done */
6627			ca->cnt_failed++;
6628			return;
6629		}
6630#ifdef SCTP_MBUF_LOGGING
6631		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6632			sctp_log_mbc(m, SCTP_MBUF_ICOPY);
6633		}
6634#endif
6635	} else {
6636		m = NULL;
6637	}
6638	SCTP_TCB_LOCK_ASSERT(stcb);
6639	if (stcb->asoc.alternate) {
6640		net = stcb->asoc.alternate;
6641	} else {
6642		net = stcb->asoc.primary_destination;
6643	}
6644	if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
6645		/* Abort this assoc with m as the user defined reason */
6646		if (m != NULL) {
6647			SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_NOWAIT);
6648		} else {
6649			m = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
6650			    0, M_NOWAIT, 1, MT_DATA);
6651			SCTP_BUF_LEN(m) = sizeof(struct sctp_paramhdr);
6652		}
6653		if (m != NULL) {
6654			struct sctp_paramhdr *ph;
6655
6656			ph = mtod(m, struct sctp_paramhdr *);
6657			ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
6658			ph->param_length = htons((uint16_t)(sizeof(struct sctp_paramhdr) + ca->sndlen));
6659		}
6660		/*
6661		 * We add one here to keep the assoc from dis-appearing on
6662		 * us.
6663		 */
6664		atomic_add_int(&stcb->asoc.refcnt, 1);
6665		sctp_abort_an_association(inp, stcb, m, SCTP_SO_NOT_LOCKED);
6666		/*
6667		 * sctp_abort_an_association calls sctp_free_asoc() free
6668		 * association will NOT free it since we incremented the
6669		 * refcnt .. we do this to prevent it being freed and things
6670		 * getting tricky since we could end up (from free_asoc)
6671		 * calling inpcb_free which would get a recursive lock call
6672		 * to the iterator lock.. But as a consequence of that the
6673		 * stcb will return to us un-locked.. since free_asoc
6674		 * returns with either no TCB or the TCB unlocked, we must
6675		 * relock.. to unlock in the iterator timer :-0
6676		 */
6677		SCTP_TCB_LOCK(stcb);
6678		atomic_add_int(&stcb->asoc.refcnt, -1);
6679		goto no_chunk_output;
6680	} else {
6681		if (m) {
6682			ret = sctp_msg_append(stcb, net, m,
6683			    &ca->sndrcv, 1);
6684		}
6685		asoc = &stcb->asoc;
6686		if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
6687			/* shutdown this assoc */
6688			if (TAILQ_EMPTY(&asoc->send_queue) &&
6689			    TAILQ_EMPTY(&asoc->sent_queue) &&
6690			    sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED) == 0) {
6691				if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
6692					goto abort_anyway;
6693				}
6694				/*
6695				 * there is nothing queued to send, so I'm
6696				 * done...
6697				 */
6698				if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6699				    (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6700				    (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6701					/*
6702					 * only send SHUTDOWN the first time
6703					 * through
6704					 */
6705					if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
6706						SCTP_STAT_DECR_GAUGE32(sctps_currestab);
6707					}
6708					SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
6709					SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
6710					sctp_stop_timers_for_shutdown(stcb);
6711					sctp_send_shutdown(stcb, net);
6712					sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
6713					    net);
6714					sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6715					    asoc->primary_destination);
6716					added_control = 1;
6717					do_chunk_output = 0;
6718				}
6719			} else {
6720				/*
6721				 * we still got (or just got) data to send,
6722				 * so set SHUTDOWN_PENDING
6723				 */
6724				/*
6725				 * XXX sockets draft says that SCTP_EOF
6726				 * should be sent with no data.  currently,
6727				 * we will allow user data to be sent first
6728				 * and move to SHUTDOWN-PENDING
6729				 */
6730				if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6731				    (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6732				    (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6733					if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
6734						asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
6735					}
6736					asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
6737					if (TAILQ_EMPTY(&asoc->send_queue) &&
6738					    TAILQ_EMPTY(&asoc->sent_queue) &&
6739					    (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
6740						struct mbuf *op_err;
6741						char msg[SCTP_DIAG_INFO_LEN];
6742
6743				abort_anyway:
6744						snprintf(msg, sizeof(msg),
6745						    "%s:%d at %s", __FILE__, __LINE__, __func__);
6746						op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
6747						    msg);
6748						atomic_add_int(&stcb->asoc.refcnt, 1);
6749						sctp_abort_an_association(stcb->sctp_ep, stcb,
6750						    op_err, SCTP_SO_NOT_LOCKED);
6751						atomic_add_int(&stcb->asoc.refcnt, -1);
6752						goto no_chunk_output;
6753					}
6754					sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6755					    asoc->primary_destination);
6756				}
6757			}
6758
6759		}
6760	}
6761	un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
6762	    (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
6763
6764	if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
6765	    (stcb->asoc.total_flight > 0) &&
6766	    (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
6767		do_chunk_output = 0;
6768	}
6769	if (do_chunk_output)
6770		sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
6771	else if (added_control) {
6772		int num_out, reason, now_filled = 0;
6773		struct timeval now;
6774		int frag_point;
6775
6776		frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
6777		(void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
6778		    &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
6779	}
6780no_chunk_output:
6781	if (ret) {
6782		ca->cnt_failed++;
6783	} else {
6784		ca->cnt_sent++;
6785	}
6786}
6787
6788static void
6789sctp_sendall_completes(void *ptr, uint32_t val SCTP_UNUSED)
6790{
6791	struct sctp_copy_all *ca;
6792
6793	ca = (struct sctp_copy_all *)ptr;
6794	/*
6795	 * Do a notify here? Kacheong suggests that the notify be done at
6796	 * the send time.. so you would push up a notification if any send
6797	 * failed. Don't know if this is feasible since the only failures we
6798	 * have is "memory" related and if you cannot get an mbuf to send
6799	 * the data you surely can't get an mbuf to send up to notify the
6800	 * user you can't send the data :->
6801	 */
6802
6803	/* now free everything */
6804	sctp_m_freem(ca->m);
6805	SCTP_FREE(ca, SCTP_M_COPYAL);
6806}
6807
6808static struct mbuf *
6809sctp_copy_out_all(struct uio *uio, int len)
6810{
6811	struct mbuf *ret, *at;
6812	int left, willcpy, cancpy, error;
6813
6814	ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAITOK, 1, MT_DATA);
6815	if (ret == NULL) {
6816		/* TSNH */
6817		return (NULL);
6818	}
6819	left = len;
6820	SCTP_BUF_LEN(ret) = 0;
6821	/* save space for the data chunk header */
6822	cancpy = (int)M_TRAILINGSPACE(ret);
6823	willcpy = min(cancpy, left);
6824	at = ret;
6825	while (left > 0) {
6826		/* Align data to the end */
6827		error = uiomove(mtod(at, caddr_t), willcpy, uio);
6828		if (error) {
6829	err_out_now:
6830			sctp_m_freem(at);
6831			return (NULL);
6832		}
6833		SCTP_BUF_LEN(at) = willcpy;
6834		SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
6835		left -= willcpy;
6836		if (left > 0) {
6837			SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg(left, 0, M_WAITOK, 1, MT_DATA);
6838			if (SCTP_BUF_NEXT(at) == NULL) {
6839				goto err_out_now;
6840			}
6841			at = SCTP_BUF_NEXT(at);
6842			SCTP_BUF_LEN(at) = 0;
6843			cancpy = (int)M_TRAILINGSPACE(at);
6844			willcpy = min(cancpy, left);
6845		}
6846	}
6847	return (ret);
6848}
6849
6850static int
6851sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
6852    struct sctp_sndrcvinfo *srcv)
6853{
6854	int ret;
6855	struct sctp_copy_all *ca;
6856
6857	SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
6858	    SCTP_M_COPYAL);
6859	if (ca == NULL) {
6860		sctp_m_freem(m);
6861		SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6862		return (ENOMEM);
6863	}
6864	memset(ca, 0, sizeof(struct sctp_copy_all));
6865
6866	ca->inp = inp;
6867	if (srcv) {
6868		memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
6869	}
6870	/*
6871	 * take off the sendall flag, it would be bad if we failed to do
6872	 * this :-0
6873	 */
6874	ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
6875	/* get length and mbuf chain */
6876	if (uio) {
6877		ca->sndlen = (int)uio->uio_resid;
6878		ca->m = sctp_copy_out_all(uio, ca->sndlen);
6879		if (ca->m == NULL) {
6880			SCTP_FREE(ca, SCTP_M_COPYAL);
6881			SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6882			return (ENOMEM);
6883		}
6884	} else {
6885		/* Gather the length of the send */
6886		struct mbuf *mat;
6887
6888		ca->sndlen = 0;
6889		for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
6890			ca->sndlen += SCTP_BUF_LEN(mat);
6891		}
6892	}
6893	ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
6894	    SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
6895	    SCTP_ASOC_ANY_STATE,
6896	    (void *)ca, 0,
6897	    sctp_sendall_completes, inp, 1);
6898	if (ret) {
6899		SCTP_PRINTF("Failed to initiate iterator for sendall\n");
6900		SCTP_FREE(ca, SCTP_M_COPYAL);
6901		SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
6902		return (EFAULT);
6903	}
6904	return (0);
6905}
6906
6907
6908void
6909sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
6910{
6911	struct sctp_tmit_chunk *chk, *nchk;
6912
6913	TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6914		if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
6915			TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6916			if (chk->data) {
6917				sctp_m_freem(chk->data);
6918				chk->data = NULL;
6919			}
6920			asoc->ctrl_queue_cnt--;
6921			sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6922		}
6923	}
6924}
6925
6926void
6927sctp_toss_old_asconf(struct sctp_tcb *stcb)
6928{
6929	struct sctp_association *asoc;
6930	struct sctp_tmit_chunk *chk, *nchk;
6931	struct sctp_asconf_chunk *acp;
6932
6933	asoc = &stcb->asoc;
6934	TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
6935		/* find SCTP_ASCONF chunk in queue */
6936		if (chk->rec.chunk_id.id == SCTP_ASCONF) {
6937			if (chk->data) {
6938				acp = mtod(chk->data, struct sctp_asconf_chunk *);
6939				if (SCTP_TSN_GT(ntohl(acp->serial_number), asoc->asconf_seq_out_acked)) {
6940					/* Not Acked yet */
6941					break;
6942				}
6943			}
6944			TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
6945			if (chk->data) {
6946				sctp_m_freem(chk->data);
6947				chk->data = NULL;
6948			}
6949			asoc->ctrl_queue_cnt--;
6950			sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6951		}
6952	}
6953}
6954
6955
6956static void
6957sctp_clean_up_datalist(struct sctp_tcb *stcb,
6958    struct sctp_association *asoc,
6959    struct sctp_tmit_chunk **data_list,
6960    int bundle_at,
6961    struct sctp_nets *net)
6962{
6963	int i;
6964	struct sctp_tmit_chunk *tp1;
6965
6966	for (i = 0; i < bundle_at; i++) {
6967		/* off of the send queue */
6968		TAILQ_REMOVE(&asoc->send_queue, data_list[i], sctp_next);
6969		asoc->send_queue_cnt--;
6970		if (i > 0) {
6971			/*
6972			 * Any chunk NOT 0 you zap the time chunk 0 gets
6973			 * zapped or set based on if a RTO measurment is
6974			 * needed.
6975			 */
6976			data_list[i]->do_rtt = 0;
6977		}
6978		/* record time */
6979		data_list[i]->sent_rcv_time = net->last_sent_time;
6980		data_list[i]->rec.data.cwnd_at_send = net->cwnd;
6981		data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.tsn;
6982		if (data_list[i]->whoTo == NULL) {
6983			data_list[i]->whoTo = net;
6984			atomic_add_int(&net->ref_count, 1);
6985		}
6986		/* on to the sent queue */
6987		tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
6988		if ((tp1) && SCTP_TSN_GT(tp1->rec.data.tsn, data_list[i]->rec.data.tsn)) {
6989			struct sctp_tmit_chunk *tpp;
6990
6991			/* need to move back */
6992	back_up_more:
6993			tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
6994			if (tpp == NULL) {
6995				TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
6996				goto all_done;
6997			}
6998			tp1 = tpp;
6999			if (SCTP_TSN_GT(tp1->rec.data.tsn, data_list[i]->rec.data.tsn)) {
7000				goto back_up_more;
7001			}
7002			TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
7003		} else {
7004			TAILQ_INSERT_TAIL(&asoc->sent_queue,
7005			    data_list[i],
7006			    sctp_next);
7007		}
7008all_done:
7009		/* This does not lower until the cum-ack passes it */
7010		asoc->sent_queue_cnt++;
7011		if ((asoc->peers_rwnd <= 0) &&
7012		    (asoc->total_flight == 0) &&
7013		    (bundle_at == 1)) {
7014			/* Mark the chunk as being a window probe */
7015			SCTP_STAT_INCR(sctps_windowprobed);
7016		}
7017#ifdef SCTP_AUDITING_ENABLED
7018		sctp_audit_log(0xC2, 3);
7019#endif
7020		data_list[i]->sent = SCTP_DATAGRAM_SENT;
7021		data_list[i]->snd_count = 1;
7022		data_list[i]->rec.data.chunk_was_revoked = 0;
7023		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
7024			sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
7025			    data_list[i]->whoTo->flight_size,
7026			    data_list[i]->book_size,
7027			    (uint32_t)(uintptr_t)data_list[i]->whoTo,
7028			    data_list[i]->rec.data.tsn);
7029		}
7030		sctp_flight_size_increase(data_list[i]);
7031		sctp_total_flight_increase(stcb, data_list[i]);
7032		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
7033			sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
7034			    asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
7035		}
7036		asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
7037		    (uint32_t)(data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
7038		if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
7039			/* SWS sender side engages */
7040			asoc->peers_rwnd = 0;
7041		}
7042	}
7043	if (asoc->cc_functions.sctp_cwnd_update_packet_transmitted) {
7044		(*asoc->cc_functions.sctp_cwnd_update_packet_transmitted) (stcb, net);
7045	}
7046}
7047
7048static void
7049sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc, int so_locked
7050#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7051    SCTP_UNUSED
7052#endif
7053)
7054{
7055	struct sctp_tmit_chunk *chk, *nchk;
7056
7057	TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
7058		if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7059		    (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||	/* EY */
7060		    (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
7061		    (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
7062		    (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) ||
7063		    (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
7064		    (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
7065		    (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
7066		    (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
7067		    (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
7068		    (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
7069		    (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
7070			/* Stray chunks must be cleaned up */
7071	clean_up_anyway:
7072			TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
7073			if (chk->data) {
7074				sctp_m_freem(chk->data);
7075				chk->data = NULL;
7076			}
7077			asoc->ctrl_queue_cnt--;
7078			if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)
7079				asoc->fwd_tsn_cnt--;
7080			sctp_free_a_chunk(stcb, chk, so_locked);
7081		} else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
7082			/* special handling, we must look into the param */
7083			if (chk != asoc->str_reset) {
7084				goto clean_up_anyway;
7085			}
7086		}
7087	}
7088}
7089
7090static uint32_t
7091sctp_can_we_split_this(struct sctp_tcb *stcb, uint32_t length,
7092    uint32_t space_left, uint32_t frag_point, int eeor_on)
7093{
7094	/*
7095	 * Make a decision on if I should split a msg into multiple parts.
7096	 * This is only asked of incomplete messages.
7097	 */
7098	if (eeor_on) {
7099		/*
7100		 * If we are doing EEOR we need to always send it if its the
7101		 * entire thing, since it might be all the guy is putting in
7102		 * the hopper.
7103		 */
7104		if (space_left >= length) {
7105			/*-
7106			 * If we have data outstanding,
7107			 * we get another chance when the sack
7108			 * arrives to transmit - wait for more data
7109			 */
7110			if (stcb->asoc.total_flight == 0) {
7111				/*
7112				 * If nothing is in flight, we zero the
7113				 * packet counter.
7114				 */
7115				return (length);
7116			}
7117			return (0);
7118
7119		} else {
7120			/* You can fill the rest */
7121			return (space_left);
7122		}
7123	}
7124	/*-
7125	 * For those strange folk that make the send buffer
7126	 * smaller than our fragmentation point, we can't
7127	 * get a full msg in so we have to allow splitting.
7128	 */
7129	if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
7130		return (length);
7131	}
7132	if ((length <= space_left) ||
7133	    ((length - space_left) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
7134		/* Sub-optimial residual don't split in non-eeor mode. */
7135		return (0);
7136	}
7137	/*
7138	 * If we reach here length is larger than the space_left. Do we wish
7139	 * to split it for the sake of packet putting together?
7140	 */
7141	if (space_left >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
7142		/* Its ok to split it */
7143		return (min(space_left, frag_point));
7144	}
7145	/* Nope, can't split */
7146	return (0);
7147}
7148
7149static uint32_t
7150sctp_move_to_outqueue(struct sctp_tcb *stcb,
7151    struct sctp_stream_out *strq,
7152    uint32_t space_left,
7153    uint32_t frag_point,
7154    int *giveup,
7155    int eeor_mode,
7156    int *bail,
7157    int so_locked
7158#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7159    SCTP_UNUSED
7160#endif
7161)
7162{
7163	/* Move from the stream to the send_queue keeping track of the total */
7164	struct sctp_association *asoc;
7165	struct sctp_stream_queue_pending *sp;
7166	struct sctp_tmit_chunk *chk;
7167	struct sctp_data_chunk *dchkh = NULL;
7168	struct sctp_idata_chunk *ndchkh = NULL;
7169	uint32_t to_move, length;
7170	int leading;
7171	uint8_t rcv_flags = 0;
7172	uint8_t some_taken;
7173	uint8_t send_lock_up = 0;
7174
7175	SCTP_TCB_LOCK_ASSERT(stcb);
7176	asoc = &stcb->asoc;
7177one_more_time:
7178	/* sa_ignore FREED_MEMORY */
7179	sp = TAILQ_FIRST(&strq->outqueue);
7180	if (sp == NULL) {
7181		if (send_lock_up == 0) {
7182			SCTP_TCB_SEND_LOCK(stcb);
7183			send_lock_up = 1;
7184		}
7185		sp = TAILQ_FIRST(&strq->outqueue);
7186		if (sp) {
7187			goto one_more_time;
7188		}
7189		if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_EXPLICIT_EOR) == 0) &&
7190		    (stcb->asoc.idata_supported == 0) &&
7191		    (strq->last_msg_incomplete)) {
7192			SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
7193			    strq->sid,
7194			    strq->last_msg_incomplete);
7195			strq->last_msg_incomplete = 0;
7196		}
7197		to_move = 0;
7198		if (send_lock_up) {
7199			SCTP_TCB_SEND_UNLOCK(stcb);
7200			send_lock_up = 0;
7201		}
7202		goto out_of;
7203	}
7204	if ((sp->msg_is_complete) && (sp->length == 0)) {
7205		if (sp->sender_all_done) {
7206			/*
7207			 * We are doing differed cleanup. Last time through
7208			 * when we took all the data the sender_all_done was
7209			 * not set.
7210			 */
7211			if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
7212				SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
7213				SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7214				    sp->sender_all_done,
7215				    sp->length,
7216				    sp->msg_is_complete,
7217				    sp->put_last_out,
7218				    send_lock_up);
7219			}
7220			if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
7221				SCTP_TCB_SEND_LOCK(stcb);
7222				send_lock_up = 1;
7223			}
7224			atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7225			TAILQ_REMOVE(&strq->outqueue, sp, next);
7226			stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7227			if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
7228			    (strq->chunks_on_queues == 0) &&
7229			    TAILQ_EMPTY(&strq->outqueue)) {
7230				stcb->asoc.trigger_reset = 1;
7231			}
7232			if (sp->net) {
7233				sctp_free_remote_addr(sp->net);
7234				sp->net = NULL;
7235			}
7236			if (sp->data) {
7237				sctp_m_freem(sp->data);
7238				sp->data = NULL;
7239			}
7240			sctp_free_a_strmoq(stcb, sp, so_locked);
7241			/* we can't be locked to it */
7242			if (send_lock_up) {
7243				SCTP_TCB_SEND_UNLOCK(stcb);
7244				send_lock_up = 0;
7245			}
7246			/* back to get the next msg */
7247			goto one_more_time;
7248		} else {
7249			/*
7250			 * sender just finished this but still holds a
7251			 * reference
7252			 */
7253			*giveup = 1;
7254			to_move = 0;
7255			goto out_of;
7256		}
7257	} else {
7258		/* is there some to get */
7259		if (sp->length == 0) {
7260			/* no */
7261			*giveup = 1;
7262			to_move = 0;
7263			goto out_of;
7264		} else if (sp->discard_rest) {
7265			if (send_lock_up == 0) {
7266				SCTP_TCB_SEND_LOCK(stcb);
7267				send_lock_up = 1;
7268			}
7269			/* Whack down the size */
7270			atomic_subtract_int(&stcb->asoc.total_output_queue_size, sp->length);
7271			if ((stcb->sctp_socket != NULL) &&
7272			    ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
7273			    (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) {
7274				atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc, sp->length);
7275			}
7276			if (sp->data) {
7277				sctp_m_freem(sp->data);
7278				sp->data = NULL;
7279				sp->tail_mbuf = NULL;
7280			}
7281			sp->length = 0;
7282			sp->some_taken = 1;
7283			*giveup = 1;
7284			to_move = 0;
7285			goto out_of;
7286		}
7287	}
7288	some_taken = sp->some_taken;
7289re_look:
7290	length = sp->length;
7291	if (sp->msg_is_complete) {
7292		/* The message is complete */
7293		to_move = min(length, frag_point);
7294		if (to_move == length) {
7295			/* All of it fits in the MTU */
7296			if (sp->some_taken) {
7297				rcv_flags |= SCTP_DATA_LAST_FRAG;
7298			} else {
7299				rcv_flags |= SCTP_DATA_NOT_FRAG;
7300			}
7301			sp->put_last_out = 1;
7302			if (sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) {
7303				rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7304			}
7305		} else {
7306			/* Not all of it fits, we fragment */
7307			if (sp->some_taken == 0) {
7308				rcv_flags |= SCTP_DATA_FIRST_FRAG;
7309			}
7310			sp->some_taken = 1;
7311		}
7312	} else {
7313		to_move = sctp_can_we_split_this(stcb, length, space_left, frag_point, eeor_mode);
7314		if (to_move) {
7315			/*-
7316			 * We use a snapshot of length in case it
7317			 * is expanding during the compare.
7318			 */
7319			uint32_t llen;
7320
7321			llen = length;
7322			if (to_move >= llen) {
7323				to_move = llen;
7324				if (send_lock_up == 0) {
7325					/*-
7326					 * We are taking all of an incomplete msg
7327					 * thus we need a send lock.
7328					 */
7329					SCTP_TCB_SEND_LOCK(stcb);
7330					send_lock_up = 1;
7331					if (sp->msg_is_complete) {
7332						/*
7333						 * the sender finished the
7334						 * msg
7335						 */
7336						goto re_look;
7337					}
7338				}
7339			}
7340			if (sp->some_taken == 0) {
7341				rcv_flags |= SCTP_DATA_FIRST_FRAG;
7342				sp->some_taken = 1;
7343			}
7344		} else {
7345			/* Nothing to take. */
7346			*giveup = 1;
7347			to_move = 0;
7348			goto out_of;
7349		}
7350	}
7351
7352	/* If we reach here, we can copy out a chunk */
7353	sctp_alloc_a_chunk(stcb, chk);
7354	if (chk == NULL) {
7355		/* No chunk memory */
7356		*giveup = 1;
7357		to_move = 0;
7358		goto out_of;
7359	}
7360	/*
7361	 * Setup for unordered if needed by looking at the user sent info
7362	 * flags.
7363	 */
7364	if (sp->sinfo_flags & SCTP_UNORDERED) {
7365		rcv_flags |= SCTP_DATA_UNORDERED;
7366	}
7367	if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
7368	    (sp->sinfo_flags & SCTP_EOF) == SCTP_EOF) {
7369		rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7370	}
7371	/* clear out the chunk before setting up */
7372	memset(chk, 0, sizeof(*chk));
7373	chk->rec.data.rcv_flags = rcv_flags;
7374
7375	if (to_move >= length) {
7376		/* we think we can steal the whole thing */
7377		if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
7378			SCTP_TCB_SEND_LOCK(stcb);
7379			send_lock_up = 1;
7380		}
7381		if (to_move < sp->length) {
7382			/* bail, it changed */
7383			goto dont_do_it;
7384		}
7385		chk->data = sp->data;
7386		chk->last_mbuf = sp->tail_mbuf;
7387		/* register the stealing */
7388		sp->data = sp->tail_mbuf = NULL;
7389	} else {
7390		struct mbuf *m;
7391
7392dont_do_it:
7393		chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_NOWAIT);
7394		chk->last_mbuf = NULL;
7395		if (chk->data == NULL) {
7396			sp->some_taken = some_taken;
7397			sctp_free_a_chunk(stcb, chk, so_locked);
7398			*bail = 1;
7399			to_move = 0;
7400			goto out_of;
7401		}
7402#ifdef SCTP_MBUF_LOGGING
7403		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
7404			sctp_log_mbc(chk->data, SCTP_MBUF_ICOPY);
7405		}
7406#endif
7407		/* Pull off the data */
7408		m_adj(sp->data, to_move);
7409		/* Now lets work our way down and compact it */
7410		m = sp->data;
7411		while (m && (SCTP_BUF_LEN(m) == 0)) {
7412			sp->data = SCTP_BUF_NEXT(m);
7413			SCTP_BUF_NEXT(m) = NULL;
7414			if (sp->tail_mbuf == m) {
7415				/*-
7416				 * Freeing tail? TSNH since
7417				 * we supposedly were taking less
7418				 * than the sp->length.
7419				 */
7420#ifdef INVARIANTS
7421				panic("Huh, freing tail? - TSNH");
7422#else
7423				SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
7424				sp->tail_mbuf = sp->data = NULL;
7425				sp->length = 0;
7426#endif
7427
7428			}
7429			sctp_m_free(m);
7430			m = sp->data;
7431		}
7432	}
7433	if (SCTP_BUF_IS_EXTENDED(chk->data)) {
7434		chk->copy_by_ref = 1;
7435	} else {
7436		chk->copy_by_ref = 0;
7437	}
7438	/*
7439	 * get last_mbuf and counts of mb usage This is ugly but hopefully
7440	 * its only one mbuf.
7441	 */
7442	if (chk->last_mbuf == NULL) {
7443		chk->last_mbuf = chk->data;
7444		while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
7445			chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
7446		}
7447	}
7448	if (to_move > length) {
7449		/*- This should not happen either
7450		 * since we always lower to_move to the size
7451		 * of sp->length if its larger.
7452		 */
7453#ifdef INVARIANTS
7454		panic("Huh, how can to_move be larger?");
7455#else
7456		SCTP_PRINTF("Huh, how can to_move be larger?\n");
7457		sp->length = 0;
7458#endif
7459	} else {
7460		atomic_subtract_int(&sp->length, to_move);
7461	}
7462	if (stcb->asoc.idata_supported == 0) {
7463		leading = sizeof(struct sctp_data_chunk);
7464	} else {
7465		leading = sizeof(struct sctp_idata_chunk);
7466	}
7467	if (M_LEADINGSPACE(chk->data) < leading) {
7468		/* Not enough room for a chunk header, get some */
7469		struct mbuf *m;
7470
7471		m = sctp_get_mbuf_for_msg(1, 0, M_NOWAIT, 0, MT_DATA);
7472		if (m == NULL) {
7473			/*
7474			 * we're in trouble here. _PREPEND below will free
7475			 * all the data if there is no leading space, so we
7476			 * must put the data back and restore.
7477			 */
7478			if (send_lock_up == 0) {
7479				SCTP_TCB_SEND_LOCK(stcb);
7480				send_lock_up = 1;
7481			}
7482			if (sp->data == NULL) {
7483				/* unsteal the data */
7484				sp->data = chk->data;
7485				sp->tail_mbuf = chk->last_mbuf;
7486			} else {
7487				struct mbuf *m_tmp;
7488
7489				/* reassemble the data */
7490				m_tmp = sp->data;
7491				sp->data = chk->data;
7492				SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
7493			}
7494			sp->some_taken = some_taken;
7495			atomic_add_int(&sp->length, to_move);
7496			chk->data = NULL;
7497			*bail = 1;
7498			sctp_free_a_chunk(stcb, chk, so_locked);
7499			to_move = 0;
7500			goto out_of;
7501		} else {
7502			SCTP_BUF_LEN(m) = 0;
7503			SCTP_BUF_NEXT(m) = chk->data;
7504			chk->data = m;
7505			M_ALIGN(chk->data, 4);
7506		}
7507	}
7508	if (stcb->asoc.idata_supported == 0) {
7509		SCTP_BUF_PREPEND(chk->data, sizeof(struct sctp_data_chunk), M_NOWAIT);
7510	} else {
7511		SCTP_BUF_PREPEND(chk->data, sizeof(struct sctp_idata_chunk), M_NOWAIT);
7512	}
7513	if (chk->data == NULL) {
7514		/* HELP, TSNH since we assured it would not above? */
7515#ifdef INVARIANTS
7516		panic("prepend failes HELP?");
7517#else
7518		SCTP_PRINTF("prepend fails HELP?\n");
7519		sctp_free_a_chunk(stcb, chk, so_locked);
7520#endif
7521		*bail = 1;
7522		to_move = 0;
7523		goto out_of;
7524	}
7525	if (stcb->asoc.idata_supported == 0) {
7526		sctp_snd_sb_alloc(stcb, sizeof(struct sctp_data_chunk));
7527		chk->book_size = chk->send_size = (uint16_t)(to_move + sizeof(struct sctp_data_chunk));
7528	} else {
7529		sctp_snd_sb_alloc(stcb, sizeof(struct sctp_idata_chunk));
7530		chk->book_size = chk->send_size = (uint16_t)(to_move + sizeof(struct sctp_idata_chunk));
7531	}
7532	chk->book_size_scale = 0;
7533	chk->sent = SCTP_DATAGRAM_UNSENT;
7534
7535	chk->flags = 0;
7536	chk->asoc = &stcb->asoc;
7537	chk->pad_inplace = 0;
7538	chk->no_fr_allowed = 0;
7539	if (stcb->asoc.idata_supported == 0) {
7540		if (rcv_flags & SCTP_DATA_UNORDERED) {
7541			/* Just use 0. The receiver ignores the values. */
7542			chk->rec.data.mid = 0;
7543		} else {
7544			chk->rec.data.mid = strq->next_mid_ordered;
7545			if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7546				strq->next_mid_ordered++;
7547			}
7548		}
7549	} else {
7550		if (rcv_flags & SCTP_DATA_UNORDERED) {
7551			chk->rec.data.mid = strq->next_mid_unordered;
7552			if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7553				strq->next_mid_unordered++;
7554			}
7555		} else {
7556			chk->rec.data.mid = strq->next_mid_ordered;
7557			if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7558				strq->next_mid_ordered++;
7559			}
7560		}
7561	}
7562	chk->rec.data.sid = sp->sid;
7563	chk->rec.data.ppid = sp->ppid;
7564	chk->rec.data.context = sp->context;
7565	chk->rec.data.doing_fast_retransmit = 0;
7566
7567	chk->rec.data.timetodrop = sp->ts;
7568	chk->flags = sp->act_flags;
7569
7570	if (sp->net) {
7571		chk->whoTo = sp->net;
7572		atomic_add_int(&chk->whoTo->ref_count, 1);
7573	} else
7574		chk->whoTo = NULL;
7575
7576	if (sp->holds_key_ref) {
7577		chk->auth_keyid = sp->auth_keyid;
7578		sctp_auth_key_acquire(stcb, chk->auth_keyid);
7579		chk->holds_key_ref = 1;
7580	}
7581	chk->rec.data.tsn = atomic_fetchadd_int(&asoc->sending_seq, 1);
7582	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
7583		sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
7584		    (uint32_t)(uintptr_t)stcb, sp->length,
7585		    (uint32_t)((chk->rec.data.sid << 16) | (0x0000ffff & chk->rec.data.mid)),
7586		    chk->rec.data.tsn);
7587	}
7588	if (stcb->asoc.idata_supported == 0) {
7589		dchkh = mtod(chk->data, struct sctp_data_chunk *);
7590	} else {
7591		ndchkh = mtod(chk->data, struct sctp_idata_chunk *);
7592	}
7593	/*
7594	 * Put the rest of the things in place now. Size was done earlier in
7595	 * previous loop prior to padding.
7596	 */
7597
7598#ifdef SCTP_ASOCLOG_OF_TSNS
7599	SCTP_TCB_LOCK_ASSERT(stcb);
7600	if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
7601		asoc->tsn_out_at = 0;
7602		asoc->tsn_out_wrapped = 1;
7603	}
7604	asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.tsn;
7605	asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.sid;
7606	asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.mid;
7607	asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
7608	asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
7609	asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
7610	asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
7611	asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
7612	asoc->tsn_out_at++;
7613#endif
7614	if (stcb->asoc.idata_supported == 0) {
7615		dchkh->ch.chunk_type = SCTP_DATA;
7616		dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7617		dchkh->dp.tsn = htonl(chk->rec.data.tsn);
7618		dchkh->dp.sid = htons(strq->sid);
7619		dchkh->dp.ssn = htons((uint16_t)chk->rec.data.mid);
7620		dchkh->dp.ppid = chk->rec.data.ppid;
7621		dchkh->ch.chunk_length = htons(chk->send_size);
7622	} else {
7623		ndchkh->ch.chunk_type = SCTP_IDATA;
7624		ndchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7625		ndchkh->dp.tsn = htonl(chk->rec.data.tsn);
7626		ndchkh->dp.sid = htons(strq->sid);
7627		ndchkh->dp.reserved = htons(0);
7628		ndchkh->dp.mid = htonl(chk->rec.data.mid);
7629		if (sp->fsn == 0)
7630			ndchkh->dp.ppid_fsn.ppid = chk->rec.data.ppid;
7631		else
7632			ndchkh->dp.ppid_fsn.fsn = htonl(sp->fsn);
7633		sp->fsn++;
7634		ndchkh->ch.chunk_length = htons(chk->send_size);
7635	}
7636	/* Now advance the chk->send_size by the actual pad needed. */
7637	if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
7638		/* need a pad */
7639		struct mbuf *lm;
7640		int pads;
7641
7642		pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
7643		lm = sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf);
7644		if (lm != NULL) {
7645			chk->last_mbuf = lm;
7646			chk->pad_inplace = 1;
7647		}
7648		chk->send_size += pads;
7649	}
7650	if (PR_SCTP_ENABLED(chk->flags)) {
7651		asoc->pr_sctp_cnt++;
7652	}
7653	if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
7654		/* All done pull and kill the message */
7655		if (sp->put_last_out == 0) {
7656			SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
7657			SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7658			    sp->sender_all_done,
7659			    sp->length,
7660			    sp->msg_is_complete,
7661			    sp->put_last_out,
7662			    send_lock_up);
7663		}
7664		if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
7665			SCTP_TCB_SEND_LOCK(stcb);
7666			send_lock_up = 1;
7667		}
7668		atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7669		TAILQ_REMOVE(&strq->outqueue, sp, next);
7670		stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7671		if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
7672		    (strq->chunks_on_queues == 0) &&
7673		    TAILQ_EMPTY(&strq->outqueue)) {
7674			stcb->asoc.trigger_reset = 1;
7675		}
7676		if (sp->net) {
7677			sctp_free_remote_addr(sp->net);
7678			sp->net = NULL;
7679		}
7680		if (sp->data) {
7681			sctp_m_freem(sp->data);
7682			sp->data = NULL;
7683		}
7684		sctp_free_a_strmoq(stcb, sp, so_locked);
7685	}
7686	asoc->chunks_on_out_queue++;
7687	strq->chunks_on_queues++;
7688	TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
7689	asoc->send_queue_cnt++;
7690out_of:
7691	if (send_lock_up) {
7692		SCTP_TCB_SEND_UNLOCK(stcb);
7693	}
7694	return (to_move);
7695}
7696
7697
7698static void
7699sctp_fill_outqueue(struct sctp_tcb *stcb,
7700    struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now, int so_locked
7701#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7702    SCTP_UNUSED
7703#endif
7704)
7705{
7706	struct sctp_association *asoc;
7707	struct sctp_stream_out *strq;
7708	uint32_t space_left, moved, total_moved;
7709	int bail, giveup;
7710
7711	SCTP_TCB_LOCK_ASSERT(stcb);
7712	asoc = &stcb->asoc;
7713	total_moved = 0;
7714	switch (net->ro._l_addr.sa.sa_family) {
7715#ifdef INET
7716	case AF_INET:
7717		space_left = net->mtu - SCTP_MIN_V4_OVERHEAD;
7718		break;
7719#endif
7720#ifdef INET6
7721	case AF_INET6:
7722		space_left = net->mtu - SCTP_MIN_OVERHEAD;
7723		break;
7724#endif
7725	default:
7726		/* TSNH */
7727		space_left = net->mtu;
7728		break;
7729	}
7730	/* Need an allowance for the data chunk header too */
7731	if (stcb->asoc.idata_supported == 0) {
7732		space_left -= sizeof(struct sctp_data_chunk);
7733	} else {
7734		space_left -= sizeof(struct sctp_idata_chunk);
7735	}
7736
7737	/* must make even word boundary */
7738	space_left &= 0xfffffffc;
7739	strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7740	giveup = 0;
7741	bail = 0;
7742	while ((space_left > 0) && (strq != NULL)) {
7743		moved = sctp_move_to_outqueue(stcb, strq, space_left, frag_point,
7744		    &giveup, eeor_mode, &bail, so_locked);
7745		stcb->asoc.ss_functions.sctp_ss_scheduled(stcb, net, asoc, strq, moved);
7746		if ((giveup != 0) || (bail != 0)) {
7747			break;
7748		}
7749		strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7750		total_moved += moved;
7751		space_left -= moved;
7752		if (stcb->asoc.idata_supported == 0) {
7753			if (space_left >= sizeof(struct sctp_data_chunk)) {
7754				space_left -= sizeof(struct sctp_data_chunk);
7755			} else {
7756				space_left = 0;
7757			}
7758		} else {
7759			if (space_left >= sizeof(struct sctp_idata_chunk)) {
7760				space_left -= sizeof(struct sctp_idata_chunk);
7761			} else {
7762				space_left = 0;
7763			}
7764		}
7765		space_left &= 0xfffffffc;
7766	}
7767	if (bail != 0)
7768		*quit_now = 1;
7769
7770	stcb->asoc.ss_functions.sctp_ss_packet_done(stcb, net, asoc);
7771
7772	if (total_moved == 0) {
7773		if ((stcb->asoc.sctp_cmt_on_off == 0) &&
7774		    (net == stcb->asoc.primary_destination)) {
7775			/* ran dry for primary network net */
7776			SCTP_STAT_INCR(sctps_primary_randry);
7777		} else if (stcb->asoc.sctp_cmt_on_off > 0) {
7778			/* ran dry with CMT on */
7779			SCTP_STAT_INCR(sctps_cmt_randry);
7780		}
7781	}
7782}
7783
7784void
7785sctp_fix_ecn_echo(struct sctp_association *asoc)
7786{
7787	struct sctp_tmit_chunk *chk;
7788
7789	TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7790		if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7791			chk->sent = SCTP_DATAGRAM_UNSENT;
7792		}
7793	}
7794}
7795
7796void
7797sctp_move_chunks_from_net(struct sctp_tcb *stcb, struct sctp_nets *net)
7798{
7799	struct sctp_association *asoc;
7800	struct sctp_tmit_chunk *chk;
7801	struct sctp_stream_queue_pending *sp;
7802	unsigned int i;
7803
7804	if (net == NULL) {
7805		return;
7806	}
7807	asoc = &stcb->asoc;
7808	for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
7809		TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
7810			if (sp->net == net) {
7811				sctp_free_remote_addr(sp->net);
7812				sp->net = NULL;
7813			}
7814		}
7815	}
7816	TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7817		if (chk->whoTo == net) {
7818			sctp_free_remote_addr(chk->whoTo);
7819			chk->whoTo = NULL;
7820		}
7821	}
7822}
7823
7824int
7825sctp_med_chunk_output(struct sctp_inpcb *inp,
7826    struct sctp_tcb *stcb,
7827    struct sctp_association *asoc,
7828    int *num_out,
7829    int *reason_code,
7830    int control_only, int from_where,
7831    struct timeval *now, int *now_filled, int frag_point, int so_locked
7832#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7833    SCTP_UNUSED
7834#endif
7835)
7836{
7837	/**
7838	 * Ok this is the generic chunk service queue. we must do the
7839	 * following:
7840	 * - Service the stream queue that is next, moving any
7841	 *   message (note I must get a complete message i.e. FIRST/MIDDLE and
7842	 *   LAST to the out queue in one pass) and assigning TSN's. This
7843	 *   only applys though if the peer does not support NDATA. For NDATA
7844	 *   chunks its ok to not send the entire message ;-)
7845	 * - Check to see if the cwnd/rwnd allows any output, if so we go ahead and
7846	 *   fomulate and send the low level chunks. Making sure to combine
7847	 *   any control in the control chunk queue also.
7848	 */
7849	struct sctp_nets *net, *start_at, *sack_goes_to = NULL, *old_start_at = NULL;
7850	struct mbuf *outchain, *endoutchain;
7851	struct sctp_tmit_chunk *chk, *nchk;
7852
7853	/* temp arrays for unlinking */
7854	struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
7855	int no_fragmentflg, error;
7856	unsigned int max_rwnd_per_dest, max_send_per_dest;
7857	int one_chunk, hbflag, skip_data_for_this_net;
7858	int asconf, cookie, no_out_cnt;
7859	int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
7860	unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
7861	int tsns_sent = 0;
7862	uint32_t auth_offset = 0;
7863	struct sctp_auth_chunk *auth = NULL;
7864	uint16_t auth_keyid;
7865	int override_ok = 1;
7866	int skip_fill_up = 0;
7867	int data_auth_reqd = 0;
7868
7869	/*
7870	 * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
7871	 * destination.
7872	 */
7873	int quit_now = 0;
7874
7875	*num_out = 0;
7876	*reason_code = 0;
7877	auth_keyid = stcb->asoc.authinfo.active_keyid;
7878	if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
7879	    (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED) ||
7880	    (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
7881		eeor_mode = 1;
7882	} else {
7883		eeor_mode = 0;
7884	}
7885	ctl_cnt = no_out_cnt = asconf = cookie = 0;
7886	/*
7887	 * First lets prime the pump. For each destination, if there is room
7888	 * in the flight size, attempt to pull an MTU's worth out of the
7889	 * stream queues into the general send_queue
7890	 */
7891#ifdef SCTP_AUDITING_ENABLED
7892	sctp_audit_log(0xC2, 2);
7893#endif
7894	SCTP_TCB_LOCK_ASSERT(stcb);
7895	hbflag = 0;
7896	if (control_only)
7897		no_data_chunks = 1;
7898	else
7899		no_data_chunks = 0;
7900
7901	/* Nothing to possible to send? */
7902	if ((TAILQ_EMPTY(&asoc->control_send_queue) ||
7903	    (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) &&
7904	    TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7905	    TAILQ_EMPTY(&asoc->send_queue) &&
7906	    sctp_is_there_unsent_data(stcb, so_locked) == 0) {
7907nothing_to_send:
7908		*reason_code = 9;
7909		return (0);
7910	}
7911	if (asoc->peers_rwnd == 0) {
7912		/* No room in peers rwnd */
7913		*reason_code = 1;
7914		if (asoc->total_flight > 0) {
7915			/* we are allowed one chunk in flight */
7916			no_data_chunks = 1;
7917		}
7918	}
7919	if (stcb->asoc.ecn_echo_cnt_onq) {
7920		/* Record where a sack goes, if any */
7921		if (no_data_chunks &&
7922		    (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) {
7923			/* Nothing but ECNe to send - we don't do that */
7924			goto nothing_to_send;
7925		}
7926		TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7927			if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7928			    (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
7929				sack_goes_to = chk->whoTo;
7930				break;
7931			}
7932		}
7933	}
7934	max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
7935	if (stcb->sctp_socket)
7936		max_send_per_dest = SCTP_SB_LIMIT_SND(stcb->sctp_socket) / asoc->numnets;
7937	else
7938		max_send_per_dest = 0;
7939	if (no_data_chunks == 0) {
7940		/* How many non-directed chunks are there? */
7941		TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7942			if (chk->whoTo == NULL) {
7943				/*
7944				 * We already have non-directed chunks on
7945				 * the queue, no need to do a fill-up.
7946				 */
7947				skip_fill_up = 1;
7948				break;
7949			}
7950		}
7951
7952	}
7953	if ((no_data_chunks == 0) &&
7954	    (skip_fill_up == 0) &&
7955	    (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc))) {
7956		TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
7957			/*
7958			 * This for loop we are in takes in each net, if
7959			 * its's got space in cwnd and has data sent to it
7960			 * (when CMT is off) then it calls
7961			 * sctp_fill_outqueue for the net. This gets data on
7962			 * the send queue for that network.
7963			 *
7964			 * In sctp_fill_outqueue TSN's are assigned and data
7965			 * is copied out of the stream buffers. Note mostly
7966			 * copy by reference (we hope).
7967			 */
7968			net->window_probe = 0;
7969			if ((net != stcb->asoc.alternate) &&
7970			    ((net->dest_state & SCTP_ADDR_PF) ||
7971			    (!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
7972			    (net->dest_state & SCTP_ADDR_UNCONFIRMED))) {
7973				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7974					sctp_log_cwnd(stcb, net, 1,
7975					    SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7976				}
7977				continue;
7978			}
7979			if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
7980			    (net->flight_size == 0)) {
7981				(*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
7982			}
7983			if (net->flight_size >= net->cwnd) {
7984				/* skip this network, no room - can't fill */
7985				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7986					sctp_log_cwnd(stcb, net, 3,
7987					    SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7988				}
7989				continue;
7990			}
7991			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7992				sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7993			}
7994			sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now, so_locked);
7995			if (quit_now) {
7996				/* memory alloc failure */
7997				no_data_chunks = 1;
7998				break;
7999			}
8000		}
8001	}
8002	/* now service each destination and send out what we can for it */
8003	/* Nothing to send? */
8004	if (TAILQ_EMPTY(&asoc->control_send_queue) &&
8005	    TAILQ_EMPTY(&asoc->asconf_send_queue) &&
8006	    TAILQ_EMPTY(&asoc->send_queue)) {
8007		*reason_code = 8;
8008		return (0);
8009	}
8010	if (asoc->sctp_cmt_on_off > 0) {
8011		/* get the last start point */
8012		start_at = asoc->last_net_cmt_send_started;
8013		if (start_at == NULL) {
8014			/* null so to beginning */
8015			start_at = TAILQ_FIRST(&asoc->nets);
8016		} else {
8017			start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
8018			if (start_at == NULL) {
8019				start_at = TAILQ_FIRST(&asoc->nets);
8020			}
8021		}
8022		asoc->last_net_cmt_send_started = start_at;
8023	} else {
8024		start_at = TAILQ_FIRST(&asoc->nets);
8025	}
8026	TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
8027		if (chk->whoTo == NULL) {
8028			if (asoc->alternate) {
8029				chk->whoTo = asoc->alternate;
8030			} else {
8031				chk->whoTo = asoc->primary_destination;
8032			}
8033			atomic_add_int(&chk->whoTo->ref_count, 1);
8034		}
8035	}
8036	old_start_at = NULL;
8037again_one_more_time:
8038	for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
8039		/* how much can we send? */
8040		/* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
8041		if (old_start_at && (old_start_at == net)) {
8042			/* through list ocmpletely. */
8043			break;
8044		}
8045		tsns_sent = 0xa;
8046		if (TAILQ_EMPTY(&asoc->control_send_queue) &&
8047		    TAILQ_EMPTY(&asoc->asconf_send_queue) &&
8048		    (net->flight_size >= net->cwnd)) {
8049			/*
8050			 * Nothing on control or asconf and flight is full,
8051			 * we can skip even in the CMT case.
8052			 */
8053			continue;
8054		}
8055		bundle_at = 0;
8056		endoutchain = outchain = NULL;
8057		no_fragmentflg = 1;
8058		one_chunk = 0;
8059		if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
8060			skip_data_for_this_net = 1;
8061		} else {
8062			skip_data_for_this_net = 0;
8063		}
8064		switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8065#ifdef INET
8066		case AF_INET:
8067			mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8068			break;
8069#endif
8070#ifdef INET6
8071		case AF_INET6:
8072			mtu = net->mtu - SCTP_MIN_OVERHEAD;
8073			break;
8074#endif
8075		default:
8076			/* TSNH */
8077			mtu = net->mtu;
8078			break;
8079		}
8080		mx_mtu = mtu;
8081		to_out = 0;
8082		if (mtu > asoc->peers_rwnd) {
8083			if (asoc->total_flight > 0) {
8084				/* We have a packet in flight somewhere */
8085				r_mtu = asoc->peers_rwnd;
8086			} else {
8087				/* We are always allowed to send one MTU out */
8088				one_chunk = 1;
8089				r_mtu = mtu;
8090			}
8091		} else {
8092			r_mtu = mtu;
8093		}
8094		error = 0;
8095		/************************/
8096		/* ASCONF transmission */
8097		/************************/
8098		/* Now first lets go through the asconf queue */
8099		TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
8100			if (chk->rec.chunk_id.id != SCTP_ASCONF) {
8101				continue;
8102			}
8103			if (chk->whoTo == NULL) {
8104				if (asoc->alternate == NULL) {
8105					if (asoc->primary_destination != net) {
8106						break;
8107					}
8108				} else {
8109					if (asoc->alternate != net) {
8110						break;
8111					}
8112				}
8113			} else {
8114				if (chk->whoTo != net) {
8115					break;
8116				}
8117			}
8118			if (chk->data == NULL) {
8119				break;
8120			}
8121			if (chk->sent != SCTP_DATAGRAM_UNSENT &&
8122			    chk->sent != SCTP_DATAGRAM_RESEND) {
8123				break;
8124			}
8125			/*
8126			 * if no AUTH is yet included and this chunk
8127			 * requires it, make sure to account for it.  We
8128			 * don't apply the size until the AUTH chunk is
8129			 * actually added below in case there is no room for
8130			 * this chunk. NOTE: we overload the use of "omtu"
8131			 * here
8132			 */
8133			if ((auth == NULL) &&
8134			    sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8135			    stcb->asoc.peer_auth_chunks)) {
8136				omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8137			} else
8138				omtu = 0;
8139			/* Here we do NOT factor the r_mtu */
8140			if ((chk->send_size < (int)(mtu - omtu)) ||
8141			    (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8142				/*
8143				 * We probably should glom the mbuf chain
8144				 * from the chk->data for control but the
8145				 * problem is it becomes yet one more level
8146				 * of tracking to do if for some reason
8147				 * output fails. Then I have got to
8148				 * reconstruct the merged control chain.. el
8149				 * yucko.. for now we take the easy way and
8150				 * do the copy
8151				 */
8152				/*
8153				 * Add an AUTH chunk, if chunk requires it
8154				 * save the offset into the chain for AUTH
8155				 */
8156				if ((auth == NULL) &&
8157				    (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8158				    stcb->asoc.peer_auth_chunks))) {
8159					outchain = sctp_add_auth_chunk(outchain,
8160					    &endoutchain,
8161					    &auth,
8162					    &auth_offset,
8163					    stcb,
8164					    chk->rec.chunk_id.id);
8165					SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8166				}
8167				outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8168				    (int)chk->rec.chunk_id.can_take_data,
8169				    chk->send_size, chk->copy_by_ref);
8170				if (outchain == NULL) {
8171					*reason_code = 8;
8172					SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8173					return (ENOMEM);
8174				}
8175				SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8176				/* update our MTU size */
8177				if (mtu > (chk->send_size + omtu))
8178					mtu -= (chk->send_size + omtu);
8179				else
8180					mtu = 0;
8181				to_out += (chk->send_size + omtu);
8182				/* Do clear IP_DF ? */
8183				if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8184					no_fragmentflg = 0;
8185				}
8186				if (chk->rec.chunk_id.can_take_data)
8187					chk->data = NULL;
8188				/*
8189				 * set hb flag since we can use these for
8190				 * RTO
8191				 */
8192				hbflag = 1;
8193				asconf = 1;
8194				/*
8195				 * should sysctl this: don't bundle data
8196				 * with ASCONF since it requires AUTH
8197				 */
8198				no_data_chunks = 1;
8199				chk->sent = SCTP_DATAGRAM_SENT;
8200				if (chk->whoTo == NULL) {
8201					chk->whoTo = net;
8202					atomic_add_int(&net->ref_count, 1);
8203				}
8204				chk->snd_count++;
8205				if (mtu == 0) {
8206					/*
8207					 * Ok we are out of room but we can
8208					 * output without effecting the
8209					 * flight size since this little guy
8210					 * is a control only packet.
8211					 */
8212					sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8213					/*
8214					 * do NOT clear the asconf flag as
8215					 * it is used to do appropriate
8216					 * source address selection.
8217					 */
8218					if (*now_filled == 0) {
8219						(void)SCTP_GETTIME_TIMEVAL(now);
8220						*now_filled = 1;
8221					}
8222					net->last_sent_time = *now;
8223					hbflag = 0;
8224					if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8225					    (struct sockaddr *)&net->ro._l_addr,
8226					    outchain, auth_offset, auth,
8227					    stcb->asoc.authinfo.active_keyid,
8228					    no_fragmentflg, 0, asconf,
8229					    inp->sctp_lport, stcb->rport,
8230					    htonl(stcb->asoc.peer_vtag),
8231					    net->port, NULL,
8232					    0, 0,
8233					    so_locked))) {
8234						/*
8235						 * error, we could not
8236						 * output
8237						 */
8238						SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8239						if (from_where == 0) {
8240							SCTP_STAT_INCR(sctps_lowlevelerrusr);
8241						}
8242						if (error == ENOBUFS) {
8243							asoc->ifp_had_enobuf = 1;
8244							SCTP_STAT_INCR(sctps_lowlevelerr);
8245						}
8246						/* error, could not output */
8247						if (error == EHOSTUNREACH) {
8248							/*
8249							 * Destination went
8250							 * unreachable
8251							 * during this send
8252							 */
8253							sctp_move_chunks_from_net(stcb, net);
8254						}
8255						*reason_code = 7;
8256						break;
8257					} else {
8258						asoc->ifp_had_enobuf = 0;
8259					}
8260					/*
8261					 * increase the number we sent, if a
8262					 * cookie is sent we don't tell them
8263					 * any was sent out.
8264					 */
8265					outchain = endoutchain = NULL;
8266					auth = NULL;
8267					auth_offset = 0;
8268					if (!no_out_cnt)
8269						*num_out += ctl_cnt;
8270					/* recalc a clean slate and setup */
8271					switch (net->ro._l_addr.sa.sa_family) {
8272#ifdef INET
8273					case AF_INET:
8274						mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8275						break;
8276#endif
8277#ifdef INET6
8278					case AF_INET6:
8279						mtu = net->mtu - SCTP_MIN_OVERHEAD;
8280						break;
8281#endif
8282					default:
8283						/* TSNH */
8284						mtu = net->mtu;
8285						break;
8286					}
8287					to_out = 0;
8288					no_fragmentflg = 1;
8289				}
8290			}
8291		}
8292		if (error != 0) {
8293			/* try next net */
8294			continue;
8295		}
8296		/************************/
8297		/* Control transmission */
8298		/************************/
8299		/* Now first lets go through the control queue */
8300		TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
8301			if ((sack_goes_to) &&
8302			    (chk->rec.chunk_id.id == SCTP_ECN_ECHO) &&
8303			    (chk->whoTo != sack_goes_to)) {
8304				/*
8305				 * if we have a sack in queue, and we are
8306				 * looking at an ecn echo that is NOT queued
8307				 * to where the sack is going..
8308				 */
8309				if (chk->whoTo == net) {
8310					/*
8311					 * Don't transmit it to where its
8312					 * going (current net)
8313					 */
8314					continue;
8315				} else if (sack_goes_to == net) {
8316					/*
8317					 * But do transmit it to this
8318					 * address
8319					 */
8320					goto skip_net_check;
8321				}
8322			}
8323			if (chk->whoTo == NULL) {
8324				if (asoc->alternate == NULL) {
8325					if (asoc->primary_destination != net) {
8326						continue;
8327					}
8328				} else {
8329					if (asoc->alternate != net) {
8330						continue;
8331					}
8332				}
8333			} else {
8334				if (chk->whoTo != net) {
8335					continue;
8336				}
8337			}
8338	skip_net_check:
8339			if (chk->data == NULL) {
8340				continue;
8341			}
8342			if (chk->sent != SCTP_DATAGRAM_UNSENT) {
8343				/*
8344				 * It must be unsent. Cookies and ASCONF's
8345				 * hang around but there timers will force
8346				 * when marked for resend.
8347				 */
8348				continue;
8349			}
8350			/*
8351			 * if no AUTH is yet included and this chunk
8352			 * requires it, make sure to account for it.  We
8353			 * don't apply the size until the AUTH chunk is
8354			 * actually added below in case there is no room for
8355			 * this chunk. NOTE: we overload the use of "omtu"
8356			 * here
8357			 */
8358			if ((auth == NULL) &&
8359			    sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8360			    stcb->asoc.peer_auth_chunks)) {
8361				omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8362			} else
8363				omtu = 0;
8364			/* Here we do NOT factor the r_mtu */
8365			if ((chk->send_size <= (int)(mtu - omtu)) ||
8366			    (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8367				/*
8368				 * We probably should glom the mbuf chain
8369				 * from the chk->data for control but the
8370				 * problem is it becomes yet one more level
8371				 * of tracking to do if for some reason
8372				 * output fails. Then I have got to
8373				 * reconstruct the merged control chain.. el
8374				 * yucko.. for now we take the easy way and
8375				 * do the copy
8376				 */
8377				/*
8378				 * Add an AUTH chunk, if chunk requires it
8379				 * save the offset into the chain for AUTH
8380				 */
8381				if ((auth == NULL) &&
8382				    (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8383				    stcb->asoc.peer_auth_chunks))) {
8384					outchain = sctp_add_auth_chunk(outchain,
8385					    &endoutchain,
8386					    &auth,
8387					    &auth_offset,
8388					    stcb,
8389					    chk->rec.chunk_id.id);
8390					SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8391				}
8392				outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8393				    (int)chk->rec.chunk_id.can_take_data,
8394				    chk->send_size, chk->copy_by_ref);
8395				if (outchain == NULL) {
8396					*reason_code = 8;
8397					SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8398					return (ENOMEM);
8399				}
8400				SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8401				/* update our MTU size */
8402				if (mtu > (chk->send_size + omtu))
8403					mtu -= (chk->send_size + omtu);
8404				else
8405					mtu = 0;
8406				to_out += (chk->send_size + omtu);
8407				/* Do clear IP_DF ? */
8408				if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8409					no_fragmentflg = 0;
8410				}
8411				if (chk->rec.chunk_id.can_take_data)
8412					chk->data = NULL;
8413				/* Mark things to be removed, if needed */
8414				if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8415				    (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||	/* EY */
8416				    (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
8417				    (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
8418				    (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
8419				    (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
8420				    (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
8421				    (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
8422				    (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
8423				    (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
8424				    (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
8425					if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
8426						hbflag = 1;
8427					}
8428					/* remove these chunks at the end */
8429					if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8430					    (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
8431						/* turn off the timer */
8432						if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
8433							sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
8434							    inp, stcb, net,
8435							    SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
8436						}
8437					}
8438					ctl_cnt++;
8439				} else {
8440					/*
8441					 * Other chunks, since they have
8442					 * timers running (i.e. COOKIE) we
8443					 * just "trust" that it gets sent or
8444					 * retransmitted.
8445					 */
8446					ctl_cnt++;
8447					if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
8448						cookie = 1;
8449						no_out_cnt = 1;
8450					} else if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
8451						/*
8452						 * Increment ecne send count
8453						 * here this means we may be
8454						 * over-zealous in our
8455						 * counting if the send
8456						 * fails, but its the best
8457						 * place to do it (we used
8458						 * to do it in the queue of
8459						 * the chunk, but that did
8460						 * not tell how many times
8461						 * it was sent.
8462						 */
8463						SCTP_STAT_INCR(sctps_sendecne);
8464					}
8465					chk->sent = SCTP_DATAGRAM_SENT;
8466					if (chk->whoTo == NULL) {
8467						chk->whoTo = net;
8468						atomic_add_int(&net->ref_count, 1);
8469					}
8470					chk->snd_count++;
8471				}
8472				if (mtu == 0) {
8473					/*
8474					 * Ok we are out of room but we can
8475					 * output without effecting the
8476					 * flight size since this little guy
8477					 * is a control only packet.
8478					 */
8479					if (asconf) {
8480						sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8481						/*
8482						 * do NOT clear the asconf
8483						 * flag as it is used to do
8484						 * appropriate source
8485						 * address selection.
8486						 */
8487					}
8488					if (cookie) {
8489						sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8490						cookie = 0;
8491					}
8492					/* Only HB or ASCONF advances time */
8493					if (hbflag) {
8494						if (*now_filled == 0) {
8495							(void)SCTP_GETTIME_TIMEVAL(now);
8496							*now_filled = 1;
8497						}
8498						net->last_sent_time = *now;
8499						hbflag = 0;
8500					}
8501					if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8502					    (struct sockaddr *)&net->ro._l_addr,
8503					    outchain,
8504					    auth_offset, auth,
8505					    stcb->asoc.authinfo.active_keyid,
8506					    no_fragmentflg, 0, asconf,
8507					    inp->sctp_lport, stcb->rport,
8508					    htonl(stcb->asoc.peer_vtag),
8509					    net->port, NULL,
8510					    0, 0,
8511					    so_locked))) {
8512						/*
8513						 * error, we could not
8514						 * output
8515						 */
8516						SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8517						if (from_where == 0) {
8518							SCTP_STAT_INCR(sctps_lowlevelerrusr);
8519						}
8520						if (error == ENOBUFS) {
8521							asoc->ifp_had_enobuf = 1;
8522							SCTP_STAT_INCR(sctps_lowlevelerr);
8523						}
8524						if (error == EHOSTUNREACH) {
8525							/*
8526							 * Destination went
8527							 * unreachable
8528							 * during this send
8529							 */
8530							sctp_move_chunks_from_net(stcb, net);
8531						}
8532						*reason_code = 7;
8533						break;
8534					} else {
8535						asoc->ifp_had_enobuf = 0;
8536					}
8537					/*
8538					 * increase the number we sent, if a
8539					 * cookie is sent we don't tell them
8540					 * any was sent out.
8541					 */
8542					outchain = endoutchain = NULL;
8543					auth = NULL;
8544					auth_offset = 0;
8545					if (!no_out_cnt)
8546						*num_out += ctl_cnt;
8547					/* recalc a clean slate and setup */
8548					switch (net->ro._l_addr.sa.sa_family) {
8549#ifdef INET
8550					case AF_INET:
8551						mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8552						break;
8553#endif
8554#ifdef INET6
8555					case AF_INET6:
8556						mtu = net->mtu - SCTP_MIN_OVERHEAD;
8557						break;
8558#endif
8559					default:
8560						/* TSNH */
8561						mtu = net->mtu;
8562						break;
8563					}
8564					to_out = 0;
8565					no_fragmentflg = 1;
8566				}
8567			}
8568		}
8569		if (error != 0) {
8570			/* try next net */
8571			continue;
8572		}
8573		/* JRI: if dest is in PF state, do not send data to it */
8574		if ((asoc->sctp_cmt_on_off > 0) &&
8575		    (net != stcb->asoc.alternate) &&
8576		    (net->dest_state & SCTP_ADDR_PF)) {
8577			goto no_data_fill;
8578		}
8579		if (net->flight_size >= net->cwnd) {
8580			goto no_data_fill;
8581		}
8582		if ((asoc->sctp_cmt_on_off > 0) &&
8583		    (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_RECV_BUFFER_SPLITTING) &&
8584		    (net->flight_size > max_rwnd_per_dest)) {
8585			goto no_data_fill;
8586		}
8587		/*
8588		 * We need a specific accounting for the usage of the send
8589		 * buffer. We also need to check the number of messages per
8590		 * net. For now, this is better than nothing and it disabled
8591		 * by default...
8592		 */
8593		if ((asoc->sctp_cmt_on_off > 0) &&
8594		    (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_SEND_BUFFER_SPLITTING) &&
8595		    (max_send_per_dest > 0) &&
8596		    (net->flight_size > max_send_per_dest)) {
8597			goto no_data_fill;
8598		}
8599		/*********************/
8600		/* Data transmission */
8601		/*********************/
8602		/*
8603		 * if AUTH for DATA is required and no AUTH has been added
8604		 * yet, account for this in the mtu now... if no data can be
8605		 * bundled, this adjustment won't matter anyways since the
8606		 * packet will be going out...
8607		 */
8608		data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
8609		    stcb->asoc.peer_auth_chunks);
8610		if (data_auth_reqd && (auth == NULL)) {
8611			mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8612		}
8613		/* now lets add any data within the MTU constraints */
8614		switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8615#ifdef INET
8616		case AF_INET:
8617			if (net->mtu > SCTP_MIN_V4_OVERHEAD)
8618				omtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8619			else
8620				omtu = 0;
8621			break;
8622#endif
8623#ifdef INET6
8624		case AF_INET6:
8625			if (net->mtu > SCTP_MIN_OVERHEAD)
8626				omtu = net->mtu - SCTP_MIN_OVERHEAD;
8627			else
8628				omtu = 0;
8629			break;
8630#endif
8631		default:
8632			/* TSNH */
8633			omtu = 0;
8634			break;
8635		}
8636		if ((((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
8637		    (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) &&
8638		    (skip_data_for_this_net == 0)) ||
8639		    (cookie)) {
8640			TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
8641				if (no_data_chunks) {
8642					/* let only control go out */
8643					*reason_code = 1;
8644					break;
8645				}
8646				if (net->flight_size >= net->cwnd) {
8647					/* skip this net, no room for data */
8648					*reason_code = 2;
8649					break;
8650				}
8651				if ((chk->whoTo != NULL) &&
8652				    (chk->whoTo != net)) {
8653					/* Don't send the chunk on this net */
8654					continue;
8655				}
8656				if (asoc->sctp_cmt_on_off == 0) {
8657					if ((asoc->alternate) &&
8658					    (asoc->alternate != net) &&
8659					    (chk->whoTo == NULL)) {
8660						continue;
8661					} else if ((net != asoc->primary_destination) &&
8662						    (asoc->alternate == NULL) &&
8663					    (chk->whoTo == NULL)) {
8664						continue;
8665					}
8666				}
8667				if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
8668					/*-
8669					 * strange, we have a chunk that is
8670					 * to big for its destination and
8671					 * yet no fragment ok flag.
8672					 * Something went wrong when the
8673					 * PMTU changed...we did not mark
8674					 * this chunk for some reason?? I
8675					 * will fix it here by letting IP
8676					 * fragment it for now and printing
8677					 * a warning. This really should not
8678					 * happen ...
8679					 */
8680					SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
8681					    chk->send_size, mtu);
8682					chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
8683				}
8684				if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
8685				    ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) == SCTP_STATE_SHUTDOWN_PENDING)) {
8686					struct sctp_data_chunk *dchkh;
8687
8688					dchkh = mtod(chk->data, struct sctp_data_chunk *);
8689					dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
8690				}
8691				if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
8692				    ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
8693					/* ok we will add this one */
8694
8695					/*
8696					 * Add an AUTH chunk, if chunk
8697					 * requires it, save the offset into
8698					 * the chain for AUTH
8699					 */
8700					if (data_auth_reqd) {
8701						if (auth == NULL) {
8702							outchain = sctp_add_auth_chunk(outchain,
8703							    &endoutchain,
8704							    &auth,
8705							    &auth_offset,
8706							    stcb,
8707							    SCTP_DATA);
8708							auth_keyid = chk->auth_keyid;
8709							override_ok = 0;
8710							SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8711						} else if (override_ok) {
8712							/*
8713							 * use this data's
8714							 * keyid
8715							 */
8716							auth_keyid = chk->auth_keyid;
8717							override_ok = 0;
8718						} else if (auth_keyid != chk->auth_keyid) {
8719							/*
8720							 * different keyid,
8721							 * so done bundling
8722							 */
8723							break;
8724						}
8725					}
8726					outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
8727					    chk->send_size, chk->copy_by_ref);
8728					if (outchain == NULL) {
8729						SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
8730						if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8731							sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8732						}
8733						*reason_code = 3;
8734						SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8735						return (ENOMEM);
8736					}
8737					/* upate our MTU size */
8738					/* Do clear IP_DF ? */
8739					if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8740						no_fragmentflg = 0;
8741					}
8742					/* unsigned subtraction of mtu */
8743					if (mtu > chk->send_size)
8744						mtu -= chk->send_size;
8745					else
8746						mtu = 0;
8747					/* unsigned subtraction of r_mtu */
8748					if (r_mtu > chk->send_size)
8749						r_mtu -= chk->send_size;
8750					else
8751						r_mtu = 0;
8752
8753					to_out += chk->send_size;
8754					if ((to_out > mx_mtu) && no_fragmentflg) {
8755#ifdef INVARIANTS
8756						panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
8757#else
8758						SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
8759						    mx_mtu, to_out);
8760#endif
8761					}
8762					chk->window_probe = 0;
8763					data_list[bundle_at++] = chk;
8764					if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8765						break;
8766					}
8767					if (chk->sent == SCTP_DATAGRAM_UNSENT) {
8768						if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
8769							SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
8770						} else {
8771							SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
8772						}
8773						if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
8774						    ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
8775							/*
8776							 * Count number of
8777							 * user msg's that
8778							 * were fragmented
8779							 * we do this by
8780							 * counting when we
8781							 * see a LAST
8782							 * fragment only.
8783							 */
8784							SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
8785					}
8786					if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
8787						if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
8788							data_list[0]->window_probe = 1;
8789							net->window_probe = 1;
8790						}
8791						break;
8792					}
8793				} else {
8794					/*
8795					 * Must be sent in order of the
8796					 * TSN's (on a network)
8797					 */
8798					break;
8799				}
8800			}	/* for (chunk gather loop for this net) */
8801		}		/* if asoc.state OPEN */
8802no_data_fill:
8803		/* Is there something to send for this destination? */
8804		if (outchain) {
8805			/* We may need to start a control timer or two */
8806			if (asconf) {
8807				sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
8808				    stcb, net);
8809				/*
8810				 * do NOT clear the asconf flag as it is
8811				 * used to do appropriate source address
8812				 * selection.
8813				 */
8814			}
8815			if (cookie) {
8816				sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8817				cookie = 0;
8818			}
8819			/* must start a send timer if data is being sent */
8820			if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8821				/*
8822				 * no timer running on this destination
8823				 * restart it.
8824				 */
8825				sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8826			}
8827			if (bundle_at || hbflag) {
8828				/* For data/asconf and hb set time */
8829				if (*now_filled == 0) {
8830					(void)SCTP_GETTIME_TIMEVAL(now);
8831					*now_filled = 1;
8832				}
8833				net->last_sent_time = *now;
8834			}
8835			/* Now send it, if there is anything to send :> */
8836			if ((error = sctp_lowlevel_chunk_output(inp,
8837			    stcb,
8838			    net,
8839			    (struct sockaddr *)&net->ro._l_addr,
8840			    outchain,
8841			    auth_offset,
8842			    auth,
8843			    auth_keyid,
8844			    no_fragmentflg,
8845			    bundle_at,
8846			    asconf,
8847			    inp->sctp_lport, stcb->rport,
8848			    htonl(stcb->asoc.peer_vtag),
8849			    net->port, NULL,
8850			    0, 0,
8851			    so_locked))) {
8852				/* error, we could not output */
8853				SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8854				if (from_where == 0) {
8855					SCTP_STAT_INCR(sctps_lowlevelerrusr);
8856				}
8857				if (error == ENOBUFS) {
8858					asoc->ifp_had_enobuf = 1;
8859					SCTP_STAT_INCR(sctps_lowlevelerr);
8860				}
8861				if (error == EHOSTUNREACH) {
8862					/*
8863					 * Destination went unreachable
8864					 * during this send
8865					 */
8866					sctp_move_chunks_from_net(stcb, net);
8867				}
8868				*reason_code = 6;
8869				/*-
8870				 * I add this line to be paranoid. As far as
8871				 * I can tell the continue, takes us back to
8872				 * the top of the for, but just to make sure
8873				 * I will reset these again here.
8874				 */
8875				ctl_cnt = bundle_at = 0;
8876				continue;	/* This takes us back to the
8877						 * for() for the nets. */
8878			} else {
8879				asoc->ifp_had_enobuf = 0;
8880			}
8881			endoutchain = NULL;
8882			auth = NULL;
8883			auth_offset = 0;
8884			if (!no_out_cnt) {
8885				*num_out += (ctl_cnt + bundle_at);
8886			}
8887			if (bundle_at) {
8888				/* setup for a RTO measurement */
8889				tsns_sent = data_list[0]->rec.data.tsn;
8890				/* fill time if not already filled */
8891				if (*now_filled == 0) {
8892					(void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8893					*now_filled = 1;
8894					*now = asoc->time_last_sent;
8895				} else {
8896					asoc->time_last_sent = *now;
8897				}
8898				if (net->rto_needed) {
8899					data_list[0]->do_rtt = 1;
8900					net->rto_needed = 0;
8901				}
8902				SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
8903				sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
8904			}
8905			if (one_chunk) {
8906				break;
8907			}
8908		}
8909		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8910			sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
8911		}
8912	}
8913	if (old_start_at == NULL) {
8914		old_start_at = start_at;
8915		start_at = TAILQ_FIRST(&asoc->nets);
8916		if (old_start_at)
8917			goto again_one_more_time;
8918	}
8919	/*
8920	 * At the end there should be no NON timed chunks hanging on this
8921	 * queue.
8922	 */
8923	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8924		sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
8925	}
8926	if ((*num_out == 0) && (*reason_code == 0)) {
8927		*reason_code = 4;
8928	} else {
8929		*reason_code = 5;
8930	}
8931	sctp_clean_up_ctl(stcb, asoc, so_locked);
8932	return (0);
8933}
8934
8935void
8936sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
8937{
8938	/*-
8939	 * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
8940	 * the control chunk queue.
8941	 */
8942	struct sctp_chunkhdr *hdr;
8943	struct sctp_tmit_chunk *chk;
8944	struct mbuf *mat, *last_mbuf;
8945	uint32_t chunk_length;
8946	uint16_t padding_length;
8947
8948	SCTP_TCB_LOCK_ASSERT(stcb);
8949	SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_NOWAIT);
8950	if (op_err == NULL) {
8951		return;
8952	}
8953	last_mbuf = NULL;
8954	chunk_length = 0;
8955	for (mat = op_err; mat != NULL; mat = SCTP_BUF_NEXT(mat)) {
8956		chunk_length += SCTP_BUF_LEN(mat);
8957		if (SCTP_BUF_NEXT(mat) == NULL) {
8958			last_mbuf = mat;
8959		}
8960	}
8961	if (chunk_length > SCTP_MAX_CHUNK_LENGTH) {
8962		sctp_m_freem(op_err);
8963		return;
8964	}
8965	padding_length = chunk_length % 4;
8966	if (padding_length != 0) {
8967		padding_length = 4 - padding_length;
8968	}
8969	if (padding_length != 0) {
8970		if (sctp_add_pad_tombuf(last_mbuf, padding_length) == NULL) {
8971			sctp_m_freem(op_err);
8972			return;
8973		}
8974	}
8975	sctp_alloc_a_chunk(stcb, chk);
8976	if (chk == NULL) {
8977		/* no memory */
8978		sctp_m_freem(op_err);
8979		return;
8980	}
8981	chk->copy_by_ref = 0;
8982	chk->send_size = (uint16_t)chunk_length;
8983	chk->sent = SCTP_DATAGRAM_UNSENT;
8984	chk->snd_count = 0;
8985	chk->asoc = &stcb->asoc;
8986	chk->data = op_err;
8987	chk->whoTo = NULL;
8988	chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
8989	chk->rec.chunk_id.can_take_data = 0;
8990	hdr = mtod(op_err, struct sctp_chunkhdr *);
8991	hdr->chunk_type = SCTP_OPERATION_ERROR;
8992	hdr->chunk_flags = 0;
8993	hdr->chunk_length = htons(chk->send_size);
8994	TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8995	chk->asoc->ctrl_queue_cnt++;
8996}
8997
8998int
8999sctp_send_cookie_echo(struct mbuf *m,
9000    int offset,
9001    struct sctp_tcb *stcb,
9002    struct sctp_nets *net)
9003{
9004	/*-
9005	 * pull out the cookie and put it at the front of the control chunk
9006	 * queue.
9007	 */
9008	int at;
9009	struct mbuf *cookie;
9010	struct sctp_paramhdr param, *phdr;
9011	struct sctp_chunkhdr *hdr;
9012	struct sctp_tmit_chunk *chk;
9013	uint16_t ptype, plen;
9014
9015	SCTP_TCB_LOCK_ASSERT(stcb);
9016	/* First find the cookie in the param area */
9017	cookie = NULL;
9018	at = offset + sizeof(struct sctp_init_chunk);
9019	for (;;) {
9020		phdr = sctp_get_next_param(m, at, &param, sizeof(param));
9021		if (phdr == NULL) {
9022			return (-3);
9023		}
9024		ptype = ntohs(phdr->param_type);
9025		plen = ntohs(phdr->param_length);
9026		if (ptype == SCTP_STATE_COOKIE) {
9027			int pad;
9028
9029			/* found the cookie */
9030			if ((pad = (plen % 4))) {
9031				plen += 4 - pad;
9032			}
9033			cookie = SCTP_M_COPYM(m, at, plen, M_NOWAIT);
9034			if (cookie == NULL) {
9035				/* No memory */
9036				return (-2);
9037			}
9038#ifdef SCTP_MBUF_LOGGING
9039			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9040				sctp_log_mbc(cookie, SCTP_MBUF_ICOPY);
9041			}
9042#endif
9043			break;
9044		}
9045		at += SCTP_SIZE32(plen);
9046	}
9047	/* ok, we got the cookie lets change it into a cookie echo chunk */
9048	/* first the change from param to cookie */
9049	hdr = mtod(cookie, struct sctp_chunkhdr *);
9050	hdr->chunk_type = SCTP_COOKIE_ECHO;
9051	hdr->chunk_flags = 0;
9052	/* get the chunk stuff now and place it in the FRONT of the queue */
9053	sctp_alloc_a_chunk(stcb, chk);
9054	if (chk == NULL) {
9055		/* no memory */
9056		sctp_m_freem(cookie);
9057		return (-5);
9058	}
9059	chk->copy_by_ref = 0;
9060	chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
9061	chk->rec.chunk_id.can_take_data = 0;
9062	chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9063	chk->send_size = plen;
9064	chk->sent = SCTP_DATAGRAM_UNSENT;
9065	chk->snd_count = 0;
9066	chk->asoc = &stcb->asoc;
9067	chk->data = cookie;
9068	chk->whoTo = net;
9069	atomic_add_int(&chk->whoTo->ref_count, 1);
9070	TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
9071	chk->asoc->ctrl_queue_cnt++;
9072	return (0);
9073}
9074
9075void
9076sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
9077    struct mbuf *m,
9078    int offset,
9079    int chk_length,
9080    struct sctp_nets *net)
9081{
9082	/*
9083	 * take a HB request and make it into a HB ack and send it.
9084	 */
9085	struct mbuf *outchain;
9086	struct sctp_chunkhdr *chdr;
9087	struct sctp_tmit_chunk *chk;
9088
9089
9090	if (net == NULL)
9091		/* must have a net pointer */
9092		return;
9093
9094	outchain = SCTP_M_COPYM(m, offset, chk_length, M_NOWAIT);
9095	if (outchain == NULL) {
9096		/* gak out of memory */
9097		return;
9098	}
9099#ifdef SCTP_MBUF_LOGGING
9100	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9101		sctp_log_mbc(outchain, SCTP_MBUF_ICOPY);
9102	}
9103#endif
9104	chdr = mtod(outchain, struct sctp_chunkhdr *);
9105	chdr->chunk_type = SCTP_HEARTBEAT_ACK;
9106	chdr->chunk_flags = 0;
9107	if (chk_length % 4) {
9108		/* need pad */
9109		uint32_t cpthis = 0;
9110		int padlen;
9111
9112		padlen = 4 - (chk_length % 4);
9113		m_copyback(outchain, chk_length, padlen, (caddr_t)&cpthis);
9114	}
9115	sctp_alloc_a_chunk(stcb, chk);
9116	if (chk == NULL) {
9117		/* no memory */
9118		sctp_m_freem(outchain);
9119		return;
9120	}
9121	chk->copy_by_ref = 0;
9122	chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
9123	chk->rec.chunk_id.can_take_data = 1;
9124	chk->flags = 0;
9125	chk->send_size = chk_length;
9126	chk->sent = SCTP_DATAGRAM_UNSENT;
9127	chk->snd_count = 0;
9128	chk->asoc = &stcb->asoc;
9129	chk->data = outchain;
9130	chk->whoTo = net;
9131	atomic_add_int(&chk->whoTo->ref_count, 1);
9132	TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9133	chk->asoc->ctrl_queue_cnt++;
9134}
9135
9136void
9137sctp_send_cookie_ack(struct sctp_tcb *stcb)
9138{
9139	/* formulate and queue a cookie-ack back to sender */
9140	struct mbuf *cookie_ack;
9141	struct sctp_chunkhdr *hdr;
9142	struct sctp_tmit_chunk *chk;
9143
9144	SCTP_TCB_LOCK_ASSERT(stcb);
9145
9146	cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
9147	if (cookie_ack == NULL) {
9148		/* no mbuf's */
9149		return;
9150	}
9151	SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
9152	sctp_alloc_a_chunk(stcb, chk);
9153	if (chk == NULL) {
9154		/* no memory */
9155		sctp_m_freem(cookie_ack);
9156		return;
9157	}
9158	chk->copy_by_ref = 0;
9159	chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
9160	chk->rec.chunk_id.can_take_data = 1;
9161	chk->flags = 0;
9162	chk->send_size = sizeof(struct sctp_chunkhdr);
9163	chk->sent = SCTP_DATAGRAM_UNSENT;
9164	chk->snd_count = 0;
9165	chk->asoc = &stcb->asoc;
9166	chk->data = cookie_ack;
9167	if (chk->asoc->last_control_chunk_from != NULL) {
9168		chk->whoTo = chk->asoc->last_control_chunk_from;
9169		atomic_add_int(&chk->whoTo->ref_count, 1);
9170	} else {
9171		chk->whoTo = NULL;
9172	}
9173	hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
9174	hdr->chunk_type = SCTP_COOKIE_ACK;
9175	hdr->chunk_flags = 0;
9176	hdr->chunk_length = htons(chk->send_size);
9177	SCTP_BUF_LEN(cookie_ack) = chk->send_size;
9178	TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9179	chk->asoc->ctrl_queue_cnt++;
9180	return;
9181}
9182
9183
9184void
9185sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
9186{
9187	/* formulate and queue a SHUTDOWN-ACK back to the sender */
9188	struct mbuf *m_shutdown_ack;
9189	struct sctp_shutdown_ack_chunk *ack_cp;
9190	struct sctp_tmit_chunk *chk;
9191
9192	m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9193	if (m_shutdown_ack == NULL) {
9194		/* no mbuf's */
9195		return;
9196	}
9197	SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
9198	sctp_alloc_a_chunk(stcb, chk);
9199	if (chk == NULL) {
9200		/* no memory */
9201		sctp_m_freem(m_shutdown_ack);
9202		return;
9203	}
9204	chk->copy_by_ref = 0;
9205	chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
9206	chk->rec.chunk_id.can_take_data = 1;
9207	chk->flags = 0;
9208	chk->send_size = sizeof(struct sctp_chunkhdr);
9209	chk->sent = SCTP_DATAGRAM_UNSENT;
9210	chk->snd_count = 0;
9211	chk->flags = 0;
9212	chk->asoc = &stcb->asoc;
9213	chk->data = m_shutdown_ack;
9214	chk->whoTo = net;
9215	if (chk->whoTo) {
9216		atomic_add_int(&chk->whoTo->ref_count, 1);
9217	}
9218	ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
9219	ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
9220	ack_cp->ch.chunk_flags = 0;
9221	ack_cp->ch.chunk_length = htons(chk->send_size);
9222	SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
9223	TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9224	chk->asoc->ctrl_queue_cnt++;
9225	return;
9226}
9227
9228void
9229sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
9230{
9231	/* formulate and queue a SHUTDOWN to the sender */
9232	struct mbuf *m_shutdown;
9233	struct sctp_shutdown_chunk *shutdown_cp;
9234	struct sctp_tmit_chunk *chk;
9235
9236	TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
9237		if (chk->rec.chunk_id.id == SCTP_SHUTDOWN) {
9238			/* We already have a SHUTDOWN queued. Reuse it. */
9239			if (chk->whoTo) {
9240				sctp_free_remote_addr(chk->whoTo);
9241				chk->whoTo = NULL;
9242			}
9243			break;
9244		}
9245	}
9246	if (chk == NULL) {
9247		m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9248		if (m_shutdown == NULL) {
9249			/* no mbuf's */
9250			return;
9251		}
9252		SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
9253		sctp_alloc_a_chunk(stcb, chk);
9254		if (chk == NULL) {
9255			/* no memory */
9256			sctp_m_freem(m_shutdown);
9257			return;
9258		}
9259		chk->copy_by_ref = 0;
9260		chk->rec.chunk_id.id = SCTP_SHUTDOWN;
9261		chk->rec.chunk_id.can_take_data = 1;
9262		chk->flags = 0;
9263		chk->send_size = sizeof(struct sctp_shutdown_chunk);
9264		chk->sent = SCTP_DATAGRAM_UNSENT;
9265		chk->snd_count = 0;
9266		chk->flags = 0;
9267		chk->asoc = &stcb->asoc;
9268		chk->data = m_shutdown;
9269		chk->whoTo = net;
9270		if (chk->whoTo) {
9271			atomic_add_int(&chk->whoTo->ref_count, 1);
9272		}
9273		shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
9274		shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
9275		shutdown_cp->ch.chunk_flags = 0;
9276		shutdown_cp->ch.chunk_length = htons(chk->send_size);
9277		shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9278		SCTP_BUF_LEN(m_shutdown) = chk->send_size;
9279		TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9280		chk->asoc->ctrl_queue_cnt++;
9281	} else {
9282		TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, sctp_next);
9283		chk->whoTo = net;
9284		if (chk->whoTo) {
9285			atomic_add_int(&chk->whoTo->ref_count, 1);
9286		}
9287		shutdown_cp = mtod(chk->data, struct sctp_shutdown_chunk *);
9288		shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9289		TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
9290	}
9291	return;
9292}
9293
9294void
9295sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
9296{
9297	/*
9298	 * formulate and queue an ASCONF to the peer. ASCONF parameters
9299	 * should be queued on the assoc queue.
9300	 */
9301	struct sctp_tmit_chunk *chk;
9302	struct mbuf *m_asconf;
9303	int len;
9304
9305	SCTP_TCB_LOCK_ASSERT(stcb);
9306
9307	if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
9308	    (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
9309		/* can't send a new one if there is one in flight already */
9310		return;
9311	}
9312	/* compose an ASCONF chunk, maximum length is PMTU */
9313	m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
9314	if (m_asconf == NULL) {
9315		return;
9316	}
9317	sctp_alloc_a_chunk(stcb, chk);
9318	if (chk == NULL) {
9319		/* no memory */
9320		sctp_m_freem(m_asconf);
9321		return;
9322	}
9323	chk->copy_by_ref = 0;
9324	chk->rec.chunk_id.id = SCTP_ASCONF;
9325	chk->rec.chunk_id.can_take_data = 0;
9326	chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9327	chk->data = m_asconf;
9328	chk->send_size = len;
9329	chk->sent = SCTP_DATAGRAM_UNSENT;
9330	chk->snd_count = 0;
9331	chk->asoc = &stcb->asoc;
9332	chk->whoTo = net;
9333	if (chk->whoTo) {
9334		atomic_add_int(&chk->whoTo->ref_count, 1);
9335	}
9336	TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
9337	chk->asoc->ctrl_queue_cnt++;
9338	return;
9339}
9340
9341void
9342sctp_send_asconf_ack(struct sctp_tcb *stcb)
9343{
9344	/*
9345	 * formulate and queue a asconf-ack back to sender. the asconf-ack
9346	 * must be stored in the tcb.
9347	 */
9348	struct sctp_tmit_chunk *chk;
9349	struct sctp_asconf_ack *ack, *latest_ack;
9350	struct mbuf *m_ack;
9351	struct sctp_nets *net = NULL;
9352
9353	SCTP_TCB_LOCK_ASSERT(stcb);
9354	/* Get the latest ASCONF-ACK */
9355	latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
9356	if (latest_ack == NULL) {
9357		return;
9358	}
9359	if (latest_ack->last_sent_to != NULL &&
9360	    latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
9361		/* we're doing a retransmission */
9362		net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
9363		if (net == NULL) {
9364			/* no alternate */
9365			if (stcb->asoc.last_control_chunk_from == NULL) {
9366				if (stcb->asoc.alternate) {
9367					net = stcb->asoc.alternate;
9368				} else {
9369					net = stcb->asoc.primary_destination;
9370				}
9371			} else {
9372				net = stcb->asoc.last_control_chunk_from;
9373			}
9374		}
9375	} else {
9376		/* normal case */
9377		if (stcb->asoc.last_control_chunk_from == NULL) {
9378			if (stcb->asoc.alternate) {
9379				net = stcb->asoc.alternate;
9380			} else {
9381				net = stcb->asoc.primary_destination;
9382			}
9383		} else {
9384			net = stcb->asoc.last_control_chunk_from;
9385		}
9386	}
9387	latest_ack->last_sent_to = net;
9388
9389	TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
9390		if (ack->data == NULL) {
9391			continue;
9392		}
9393		/* copy the asconf_ack */
9394		m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_NOWAIT);
9395		if (m_ack == NULL) {
9396			/* couldn't copy it */
9397			return;
9398		}
9399#ifdef SCTP_MBUF_LOGGING
9400		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9401			sctp_log_mbc(m_ack, SCTP_MBUF_ICOPY);
9402		}
9403#endif
9404
9405		sctp_alloc_a_chunk(stcb, chk);
9406		if (chk == NULL) {
9407			/* no memory */
9408			if (m_ack)
9409				sctp_m_freem(m_ack);
9410			return;
9411		}
9412		chk->copy_by_ref = 0;
9413		chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
9414		chk->rec.chunk_id.can_take_data = 1;
9415		chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9416		chk->whoTo = net;
9417		if (chk->whoTo) {
9418			atomic_add_int(&chk->whoTo->ref_count, 1);
9419		}
9420		chk->data = m_ack;
9421		chk->send_size = ack->len;
9422		chk->sent = SCTP_DATAGRAM_UNSENT;
9423		chk->snd_count = 0;
9424		chk->asoc = &stcb->asoc;
9425
9426		TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9427		chk->asoc->ctrl_queue_cnt++;
9428	}
9429	return;
9430}
9431
9432
9433static int
9434sctp_chunk_retransmission(struct sctp_inpcb *inp,
9435    struct sctp_tcb *stcb,
9436    struct sctp_association *asoc,
9437    int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked
9438#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9439    SCTP_UNUSED
9440#endif
9441)
9442{
9443	/*-
9444	 * send out one MTU of retransmission. If fast_retransmit is
9445	 * happening we ignore the cwnd. Otherwise we obey the cwnd and
9446	 * rwnd. For a Cookie or Asconf in the control chunk queue we
9447	 * retransmit them by themselves.
9448	 *
9449	 * For data chunks we will pick out the lowest TSN's in the sent_queue
9450	 * marked for resend and bundle them all together (up to a MTU of
9451	 * destination). The address to send to should have been
9452	 * selected/changed where the retransmission was marked (i.e. in FR
9453	 * or t3-timeout routines).
9454	 */
9455	struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
9456	struct sctp_tmit_chunk *chk, *fwd;
9457	struct mbuf *m, *endofchain;
9458	struct sctp_nets *net = NULL;
9459	uint32_t tsns_sent = 0;
9460	int no_fragmentflg, bundle_at, cnt_thru;
9461	unsigned int mtu;
9462	int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
9463	struct sctp_auth_chunk *auth = NULL;
9464	uint32_t auth_offset = 0;
9465	uint16_t auth_keyid;
9466	int override_ok = 1;
9467	int data_auth_reqd = 0;
9468	uint32_t dmtu = 0;
9469
9470	SCTP_TCB_LOCK_ASSERT(stcb);
9471	tmr_started = ctl_cnt = bundle_at = error = 0;
9472	no_fragmentflg = 1;
9473	fwd_tsn = 0;
9474	*cnt_out = 0;
9475	fwd = NULL;
9476	endofchain = m = NULL;
9477	auth_keyid = stcb->asoc.authinfo.active_keyid;
9478#ifdef SCTP_AUDITING_ENABLED
9479	sctp_audit_log(0xC3, 1);
9480#endif
9481	if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
9482	    (TAILQ_EMPTY(&asoc->control_send_queue))) {
9483		SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
9484		    asoc->sent_queue_retran_cnt);
9485		asoc->sent_queue_cnt = 0;
9486		asoc->sent_queue_cnt_removeable = 0;
9487		/* send back 0/0 so we enter normal transmission */
9488		*cnt_out = 0;
9489		return (0);
9490	}
9491	TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9492		if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
9493		    (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
9494		    (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
9495			if (chk->sent != SCTP_DATAGRAM_RESEND) {
9496				continue;
9497			}
9498			if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
9499				if (chk != asoc->str_reset) {
9500					/*
9501					 * not eligible for retran if its
9502					 * not ours
9503					 */
9504					continue;
9505				}
9506			}
9507			ctl_cnt++;
9508			if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9509				fwd_tsn = 1;
9510			}
9511			/*
9512			 * Add an AUTH chunk, if chunk requires it save the
9513			 * offset into the chain for AUTH
9514			 */
9515			if ((auth == NULL) &&
9516			    (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
9517			    stcb->asoc.peer_auth_chunks))) {
9518				m = sctp_add_auth_chunk(m, &endofchain,
9519				    &auth, &auth_offset,
9520				    stcb,
9521				    chk->rec.chunk_id.id);
9522				SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9523			}
9524			m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9525			break;
9526		}
9527	}
9528	one_chunk = 0;
9529	cnt_thru = 0;
9530	/* do we have control chunks to retransmit? */
9531	if (m != NULL) {
9532		/* Start a timer no matter if we succeed or fail */
9533		if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
9534			sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
9535		} else if (chk->rec.chunk_id.id == SCTP_ASCONF)
9536			sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
9537		chk->snd_count++;	/* update our count */
9538		if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
9539		    (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
9540		    auth_offset, auth, stcb->asoc.authinfo.active_keyid,
9541		    no_fragmentflg, 0, 0,
9542		    inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9543		    chk->whoTo->port, NULL,
9544		    0, 0,
9545		    so_locked))) {
9546			SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
9547			if (error == ENOBUFS) {
9548				asoc->ifp_had_enobuf = 1;
9549				SCTP_STAT_INCR(sctps_lowlevelerr);
9550			}
9551			return (error);
9552		} else {
9553			asoc->ifp_had_enobuf = 0;
9554		}
9555		endofchain = NULL;
9556		auth = NULL;
9557		auth_offset = 0;
9558		/*
9559		 * We don't want to mark the net->sent time here since this
9560		 * we use this for HB and retrans cannot measure RTT
9561		 */
9562		/* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
9563		*cnt_out += 1;
9564		chk->sent = SCTP_DATAGRAM_SENT;
9565		sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
9566		if (fwd_tsn == 0) {
9567			return (0);
9568		} else {
9569			/* Clean up the fwd-tsn list */
9570			sctp_clean_up_ctl(stcb, asoc, so_locked);
9571			return (0);
9572		}
9573	}
9574	/*
9575	 * Ok, it is just data retransmission we need to do or that and a
9576	 * fwd-tsn with it all.
9577	 */
9578	if (TAILQ_EMPTY(&asoc->sent_queue)) {
9579		return (SCTP_RETRAN_DONE);
9580	}
9581	if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) ||
9582	    (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT)) {
9583		/* not yet open, resend the cookie and that is it */
9584		return (1);
9585	}
9586#ifdef SCTP_AUDITING_ENABLED
9587	sctp_auditing(20, inp, stcb, NULL);
9588#endif
9589	data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
9590	TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
9591		if (chk->sent != SCTP_DATAGRAM_RESEND) {
9592			/* No, not sent to this net or not ready for rtx */
9593			continue;
9594		}
9595		if (chk->data == NULL) {
9596			SCTP_PRINTF("TSN:%x chk->snd_count:%d chk->sent:%d can't retran - no data\n",
9597			    chk->rec.data.tsn, chk->snd_count, chk->sent);
9598			continue;
9599		}
9600		if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
9601		    (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
9602			struct mbuf *op_err;
9603			char msg[SCTP_DIAG_INFO_LEN];
9604
9605			snprintf(msg, sizeof(msg), "TSN %8.8x retransmitted %d times, giving up",
9606			    chk->rec.data.tsn, chk->snd_count);
9607			op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
9608			    msg);
9609			atomic_add_int(&stcb->asoc.refcnt, 1);
9610			sctp_abort_an_association(stcb->sctp_ep, stcb, op_err,
9611			    so_locked);
9612			SCTP_TCB_LOCK(stcb);
9613			atomic_subtract_int(&stcb->asoc.refcnt, 1);
9614			return (SCTP_RETRAN_EXIT);
9615		}
9616		/* pick up the net */
9617		net = chk->whoTo;
9618		switch (net->ro._l_addr.sa.sa_family) {
9619#ifdef INET
9620		case AF_INET:
9621			mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
9622			break;
9623#endif
9624#ifdef INET6
9625		case AF_INET6:
9626			mtu = net->mtu - SCTP_MIN_OVERHEAD;
9627			break;
9628#endif
9629		default:
9630			/* TSNH */
9631			mtu = net->mtu;
9632			break;
9633		}
9634
9635		if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
9636			/* No room in peers rwnd */
9637			uint32_t tsn;
9638
9639			tsn = asoc->last_acked_seq + 1;
9640			if (tsn == chk->rec.data.tsn) {
9641				/*
9642				 * we make a special exception for this
9643				 * case. The peer has no rwnd but is missing
9644				 * the lowest chunk.. which is probably what
9645				 * is holding up the rwnd.
9646				 */
9647				goto one_chunk_around;
9648			}
9649			return (1);
9650		}
9651one_chunk_around:
9652		if (asoc->peers_rwnd < mtu) {
9653			one_chunk = 1;
9654			if ((asoc->peers_rwnd == 0) &&
9655			    (asoc->total_flight == 0)) {
9656				chk->window_probe = 1;
9657				chk->whoTo->window_probe = 1;
9658			}
9659		}
9660#ifdef SCTP_AUDITING_ENABLED
9661		sctp_audit_log(0xC3, 2);
9662#endif
9663		bundle_at = 0;
9664		m = NULL;
9665		net->fast_retran_ip = 0;
9666		if (chk->rec.data.doing_fast_retransmit == 0) {
9667			/*
9668			 * if no FR in progress skip destination that have
9669			 * flight_size > cwnd.
9670			 */
9671			if (net->flight_size >= net->cwnd) {
9672				continue;
9673			}
9674		} else {
9675			/*
9676			 * Mark the destination net to have FR recovery
9677			 * limits put on it.
9678			 */
9679			*fr_done = 1;
9680			net->fast_retran_ip = 1;
9681		}
9682
9683		/*
9684		 * if no AUTH is yet included and this chunk requires it,
9685		 * make sure to account for it.  We don't apply the size
9686		 * until the AUTH chunk is actually added below in case
9687		 * there is no room for this chunk.
9688		 */
9689		if (data_auth_reqd && (auth == NULL)) {
9690			dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9691		} else
9692			dmtu = 0;
9693
9694		if ((chk->send_size <= (mtu - dmtu)) ||
9695		    (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
9696			/* ok we will add this one */
9697			if (data_auth_reqd) {
9698				if (auth == NULL) {
9699					m = sctp_add_auth_chunk(m,
9700					    &endofchain,
9701					    &auth,
9702					    &auth_offset,
9703					    stcb,
9704					    SCTP_DATA);
9705					auth_keyid = chk->auth_keyid;
9706					override_ok = 0;
9707					SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9708				} else if (override_ok) {
9709					auth_keyid = chk->auth_keyid;
9710					override_ok = 0;
9711				} else if (chk->auth_keyid != auth_keyid) {
9712					/* different keyid, so done bundling */
9713					break;
9714				}
9715			}
9716			m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9717			if (m == NULL) {
9718				SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9719				return (ENOMEM);
9720			}
9721			/* Do clear IP_DF ? */
9722			if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9723				no_fragmentflg = 0;
9724			}
9725			/* upate our MTU size */
9726			if (mtu > (chk->send_size + dmtu))
9727				mtu -= (chk->send_size + dmtu);
9728			else
9729				mtu = 0;
9730			data_list[bundle_at++] = chk;
9731			if (one_chunk && (asoc->total_flight <= 0)) {
9732				SCTP_STAT_INCR(sctps_windowprobed);
9733			}
9734		}
9735		if (one_chunk == 0) {
9736			/*
9737			 * now are there anymore forward from chk to pick
9738			 * up?
9739			 */
9740			for (fwd = TAILQ_NEXT(chk, sctp_next); fwd != NULL; fwd = TAILQ_NEXT(fwd, sctp_next)) {
9741				if (fwd->sent != SCTP_DATAGRAM_RESEND) {
9742					/* Nope, not for retran */
9743					continue;
9744				}
9745				if (fwd->whoTo != net) {
9746					/* Nope, not the net in question */
9747					continue;
9748				}
9749				if (data_auth_reqd && (auth == NULL)) {
9750					dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9751				} else
9752					dmtu = 0;
9753				if (fwd->send_size <= (mtu - dmtu)) {
9754					if (data_auth_reqd) {
9755						if (auth == NULL) {
9756							m = sctp_add_auth_chunk(m,
9757							    &endofchain,
9758							    &auth,
9759							    &auth_offset,
9760							    stcb,
9761							    SCTP_DATA);
9762							auth_keyid = fwd->auth_keyid;
9763							override_ok = 0;
9764							SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9765						} else if (override_ok) {
9766							auth_keyid = fwd->auth_keyid;
9767							override_ok = 0;
9768						} else if (fwd->auth_keyid != auth_keyid) {
9769							/*
9770							 * different keyid,
9771							 * so done bundling
9772							 */
9773							break;
9774						}
9775					}
9776					m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
9777					if (m == NULL) {
9778						SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9779						return (ENOMEM);
9780					}
9781					/* Do clear IP_DF ? */
9782					if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9783						no_fragmentflg = 0;
9784					}
9785					/* upate our MTU size */
9786					if (mtu > (fwd->send_size + dmtu))
9787						mtu -= (fwd->send_size + dmtu);
9788					else
9789						mtu = 0;
9790					data_list[bundle_at++] = fwd;
9791					if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
9792						break;
9793					}
9794				} else {
9795					/* can't fit so we are done */
9796					break;
9797				}
9798			}
9799		}
9800		/* Is there something to send for this destination? */
9801		if (m) {
9802			/*
9803			 * No matter if we fail/or succeed we should start a
9804			 * timer. A failure is like a lost IP packet :-)
9805			 */
9806			if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9807				/*
9808				 * no timer running on this destination
9809				 * restart it.
9810				 */
9811				sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9812				tmr_started = 1;
9813			}
9814			/* Now lets send it, if there is anything to send :> */
9815			if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
9816			    (struct sockaddr *)&net->ro._l_addr, m,
9817			    auth_offset, auth, auth_keyid,
9818			    no_fragmentflg, 0, 0,
9819			    inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9820			    net->port, NULL,
9821			    0, 0,
9822			    so_locked))) {
9823				/* error, we could not output */
9824				SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
9825				if (error == ENOBUFS) {
9826					asoc->ifp_had_enobuf = 1;
9827					SCTP_STAT_INCR(sctps_lowlevelerr);
9828				}
9829				return (error);
9830			} else {
9831				asoc->ifp_had_enobuf = 0;
9832			}
9833			endofchain = NULL;
9834			auth = NULL;
9835			auth_offset = 0;
9836			/* For HB's */
9837			/*
9838			 * We don't want to mark the net->sent time here
9839			 * since this we use this for HB and retrans cannot
9840			 * measure RTT
9841			 */
9842			/* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
9843
9844			/* For auto-close */
9845			cnt_thru++;
9846			if (*now_filled == 0) {
9847				(void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
9848				*now = asoc->time_last_sent;
9849				*now_filled = 1;
9850			} else {
9851				asoc->time_last_sent = *now;
9852			}
9853			*cnt_out += bundle_at;
9854#ifdef SCTP_AUDITING_ENABLED
9855			sctp_audit_log(0xC4, bundle_at);
9856#endif
9857			if (bundle_at) {
9858				tsns_sent = data_list[0]->rec.data.tsn;
9859			}
9860			for (i = 0; i < bundle_at; i++) {
9861				SCTP_STAT_INCR(sctps_sendretransdata);
9862				data_list[i]->sent = SCTP_DATAGRAM_SENT;
9863				/*
9864				 * When we have a revoked data, and we
9865				 * retransmit it, then we clear the revoked
9866				 * flag since this flag dictates if we
9867				 * subtracted from the fs
9868				 */
9869				if (data_list[i]->rec.data.chunk_was_revoked) {
9870					/* Deflate the cwnd */
9871					data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
9872					data_list[i]->rec.data.chunk_was_revoked = 0;
9873				}
9874				data_list[i]->snd_count++;
9875				sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9876				/* record the time */
9877				data_list[i]->sent_rcv_time = asoc->time_last_sent;
9878				if (data_list[i]->book_size_scale) {
9879					/*
9880					 * need to double the book size on
9881					 * this one
9882					 */
9883					data_list[i]->book_size_scale = 0;
9884					/*
9885					 * Since we double the booksize, we
9886					 * must also double the output queue
9887					 * size, since this get shrunk when
9888					 * we free by this amount.
9889					 */
9890					atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
9891					data_list[i]->book_size *= 2;
9892
9893
9894				} else {
9895					if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
9896						sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
9897						    asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
9898					}
9899					asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
9900					    (uint32_t)(data_list[i]->send_size +
9901					    SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
9902				}
9903				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
9904					sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
9905					    data_list[i]->whoTo->flight_size,
9906					    data_list[i]->book_size,
9907					    (uint32_t)(uintptr_t)data_list[i]->whoTo,
9908					    data_list[i]->rec.data.tsn);
9909				}
9910				sctp_flight_size_increase(data_list[i]);
9911				sctp_total_flight_increase(stcb, data_list[i]);
9912				if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
9913					/* SWS sender side engages */
9914					asoc->peers_rwnd = 0;
9915				}
9916				if ((i == 0) &&
9917				    (data_list[i]->rec.data.doing_fast_retransmit)) {
9918					SCTP_STAT_INCR(sctps_sendfastretrans);
9919					if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
9920					    (tmr_started == 0)) {
9921						/*-
9922						 * ok we just fast-retrans'd
9923						 * the lowest TSN, i.e the
9924						 * first on the list. In
9925						 * this case we want to give
9926						 * some more time to get a
9927						 * SACK back without a
9928						 * t3-expiring.
9929						 */
9930						sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
9931						    SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_2);
9932						sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9933					}
9934				}
9935			}
9936			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9937				sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
9938			}
9939#ifdef SCTP_AUDITING_ENABLED
9940			sctp_auditing(21, inp, stcb, NULL);
9941#endif
9942		} else {
9943			/* None will fit */
9944			return (1);
9945		}
9946		if (asoc->sent_queue_retran_cnt <= 0) {
9947			/* all done we have no more to retran */
9948			asoc->sent_queue_retran_cnt = 0;
9949			break;
9950		}
9951		if (one_chunk) {
9952			/* No more room in rwnd */
9953			return (1);
9954		}
9955		/* stop the for loop here. we sent out a packet */
9956		break;
9957	}
9958	return (0);
9959}
9960
9961static void
9962sctp_timer_validation(struct sctp_inpcb *inp,
9963    struct sctp_tcb *stcb,
9964    struct sctp_association *asoc)
9965{
9966	struct sctp_nets *net;
9967
9968	/* Validate that a timer is running somewhere */
9969	TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9970		if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9971			/* Here is a timer */
9972			return;
9973		}
9974	}
9975	SCTP_TCB_LOCK_ASSERT(stcb);
9976	/* Gak, we did not have a timer somewhere */
9977	SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
9978	if (asoc->alternate) {
9979		sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->alternate);
9980	} else {
9981		sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
9982	}
9983	return;
9984}
9985
9986void
9987sctp_chunk_output(struct sctp_inpcb *inp,
9988    struct sctp_tcb *stcb,
9989    int from_where,
9990    int so_locked
9991#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9992    SCTP_UNUSED
9993#endif
9994)
9995{
9996	/*-
9997	 * Ok this is the generic chunk service queue. we must do the
9998	 * following:
9999	 * - See if there are retransmits pending, if so we must
10000	 *   do these first.
10001	 * - Service the stream queue that is next, moving any
10002	 *   message (note I must get a complete message i.e.
10003	 *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
10004	 *   TSN's
10005	 * - Check to see if the cwnd/rwnd allows any output, if so we
10006	 *   go ahead and fomulate and send the low level chunks. Making sure
10007	 *   to combine any control in the control chunk queue also.
10008	 */
10009	struct sctp_association *asoc;
10010	struct sctp_nets *net;
10011	int error = 0, num_out, tot_out = 0, ret = 0, reason_code;
10012	unsigned int burst_cnt = 0;
10013	struct timeval now;
10014	int now_filled = 0;
10015	int nagle_on;
10016	int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
10017	int un_sent = 0;
10018	int fr_done;
10019	unsigned int tot_frs = 0;
10020
10021	asoc = &stcb->asoc;
10022do_it_again:
10023	/* The Nagle algorithm is only applied when handling a send call. */
10024	if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
10025		if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
10026			nagle_on = 0;
10027		} else {
10028			nagle_on = 1;
10029		}
10030	} else {
10031		nagle_on = 0;
10032	}
10033	SCTP_TCB_LOCK_ASSERT(stcb);
10034
10035	un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
10036
10037	if ((un_sent <= 0) &&
10038	    (TAILQ_EMPTY(&asoc->control_send_queue)) &&
10039	    (TAILQ_EMPTY(&asoc->asconf_send_queue)) &&
10040	    (asoc->sent_queue_retran_cnt == 0) &&
10041	    (asoc->trigger_reset == 0)) {
10042		/* Nothing to do unless there is something to be sent left */
10043		return;
10044	}
10045	/*
10046	 * Do we have something to send, data or control AND a sack timer
10047	 * running, if so piggy-back the sack.
10048	 */
10049	if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
10050		sctp_send_sack(stcb, so_locked);
10051		(void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
10052	}
10053	while (asoc->sent_queue_retran_cnt) {
10054		/*-
10055		 * Ok, it is retransmission time only, we send out only ONE
10056		 * packet with a single call off to the retran code.
10057		 */
10058		if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
10059			/*-
10060			 * Special hook for handling cookiess discarded
10061			 * by peer that carried data. Send cookie-ack only
10062			 * and then the next call with get the retran's.
10063			 */
10064			(void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10065			    from_where,
10066			    &now, &now_filled, frag_point, so_locked);
10067			return;
10068		} else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
10069			/* if its not from a HB then do it */
10070			fr_done = 0;
10071			ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
10072			if (fr_done) {
10073				tot_frs++;
10074			}
10075		} else {
10076			/*
10077			 * its from any other place, we don't allow retran
10078			 * output (only control)
10079			 */
10080			ret = 1;
10081		}
10082		if (ret > 0) {
10083			/* Can't send anymore */
10084			/*-
10085			 * now lets push out control by calling med-level
10086			 * output once. this assures that we WILL send HB's
10087			 * if queued too.
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#ifdef SCTP_AUDITING_ENABLED
10093			sctp_auditing(8, inp, stcb, NULL);
10094#endif
10095			sctp_timer_validation(inp, stcb, asoc);
10096			return;
10097		}
10098		if (ret < 0) {
10099			/*-
10100			 * The count was off.. retran is not happening so do
10101			 * the normal retransmission.
10102			 */
10103#ifdef SCTP_AUDITING_ENABLED
10104			sctp_auditing(9, inp, stcb, NULL);
10105#endif
10106			if (ret == SCTP_RETRAN_EXIT) {
10107				return;
10108			}
10109			break;
10110		}
10111		if (from_where == SCTP_OUTPUT_FROM_T3) {
10112			/* Only one transmission allowed out of a timeout */
10113#ifdef SCTP_AUDITING_ENABLED
10114			sctp_auditing(10, inp, stcb, NULL);
10115#endif
10116			/* Push out any control */
10117			(void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
10118			    &now, &now_filled, frag_point, so_locked);
10119			return;
10120		}
10121		if ((asoc->fr_max_burst > 0) && (tot_frs >= asoc->fr_max_burst)) {
10122			/* Hit FR burst limit */
10123			return;
10124		}
10125		if ((num_out == 0) && (ret == 0)) {
10126			/* No more retrans to send */
10127			break;
10128		}
10129	}
10130#ifdef SCTP_AUDITING_ENABLED
10131	sctp_auditing(12, inp, stcb, NULL);
10132#endif
10133	/* Check for bad destinations, if they exist move chunks around. */
10134	TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
10135		if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
10136			/*-
10137			 * if possible move things off of this address we
10138			 * still may send below due to the dormant state but
10139			 * we try to find an alternate address to send to
10140			 * and if we have one we move all queued data on the
10141			 * out wheel to this alternate address.
10142			 */
10143			if (net->ref_count > 1)
10144				sctp_move_chunks_from_net(stcb, net);
10145		} else {
10146			/*-
10147			 * if ((asoc->sat_network) || (net->addr_is_local))
10148			 * { burst_limit = asoc->max_burst *
10149			 * SCTP_SAT_NETWORK_BURST_INCR; }
10150			 */
10151			if (asoc->max_burst > 0) {
10152				if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
10153					if ((net->flight_size + (asoc->max_burst * net->mtu)) < net->cwnd) {
10154						/*
10155						 * JRS - Use the congestion
10156						 * control given in the
10157						 * congestion control module
10158						 */
10159						asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, asoc->max_burst);
10160						if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10161							sctp_log_maxburst(stcb, net, 0, asoc->max_burst, SCTP_MAX_BURST_APPLIED);
10162						}
10163						SCTP_STAT_INCR(sctps_maxburstqueued);
10164					}
10165					net->fast_retran_ip = 0;
10166				} else {
10167					if (net->flight_size == 0) {
10168						/*
10169						 * Should be decaying the
10170						 * cwnd here
10171						 */
10172						;
10173					}
10174				}
10175			}
10176		}
10177
10178	}
10179	burst_cnt = 0;
10180	do {
10181		error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
10182		    &reason_code, 0, from_where,
10183		    &now, &now_filled, frag_point, so_locked);
10184		if (error) {
10185			SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
10186			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10187				sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
10188			}
10189			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10190				sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
10191				sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
10192			}
10193			break;
10194		}
10195		SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
10196
10197		tot_out += num_out;
10198		burst_cnt++;
10199		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10200			sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
10201			if (num_out == 0) {
10202				sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
10203			}
10204		}
10205		if (nagle_on) {
10206			/*
10207			 * When the Nagle algorithm is used, look at how
10208			 * much is unsent, then if its smaller than an MTU
10209			 * and we have data in flight we stop, except if we
10210			 * are handling a fragmented user message.
10211			 */
10212			un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
10213			    (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
10214			if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
10215			    (stcb->asoc.total_flight > 0)) {
10216/*	&&		     sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {*/
10217				break;
10218			}
10219		}
10220		if (TAILQ_EMPTY(&asoc->control_send_queue) &&
10221		    TAILQ_EMPTY(&asoc->send_queue) &&
10222		    sctp_is_there_unsent_data(stcb, so_locked) == 0) {
10223			/* Nothing left to send */
10224			break;
10225		}
10226		if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
10227			/* Nothing left to send */
10228			break;
10229		}
10230	} while (num_out &&
10231	    ((asoc->max_burst == 0) ||
10232	    SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
10233	    (burst_cnt < asoc->max_burst)));
10234
10235	if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
10236		if ((asoc->max_burst > 0) && (burst_cnt >= asoc->max_burst)) {
10237			SCTP_STAT_INCR(sctps_maxburstqueued);
10238			asoc->burst_limit_applied = 1;
10239			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10240				sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
10241			}
10242		} else {
10243			asoc->burst_limit_applied = 0;
10244		}
10245	}
10246	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10247		sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
10248	}
10249	SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
10250	    tot_out);
10251
10252	/*-
10253	 * Now we need to clean up the control chunk chain if a ECNE is on
10254	 * it. It must be marked as UNSENT again so next call will continue
10255	 * to send it until such time that we get a CWR, to remove it.
10256	 */
10257	if (stcb->asoc.ecn_echo_cnt_onq)
10258		sctp_fix_ecn_echo(asoc);
10259
10260	if (stcb->asoc.trigger_reset) {
10261		if (sctp_send_stream_reset_out_if_possible(stcb, so_locked) == 0) {
10262			goto do_it_again;
10263		}
10264	}
10265	return;
10266}
10267
10268
10269int
10270sctp_output(
10271    struct sctp_inpcb *inp,
10272    struct mbuf *m,
10273    struct sockaddr *addr,
10274    struct mbuf *control,
10275    struct thread *p,
10276    int flags)
10277{
10278	if (inp == NULL) {
10279		SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10280		return (EINVAL);
10281	}
10282	if (inp->sctp_socket == NULL) {
10283		SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10284		return (EINVAL);
10285	}
10286	return (sctp_sosend(inp->sctp_socket,
10287	    addr,
10288	    (struct uio *)NULL,
10289	    m,
10290	    control,
10291	    flags, p
10292	    ));
10293}
10294
10295void
10296send_forward_tsn(struct sctp_tcb *stcb,
10297    struct sctp_association *asoc)
10298{
10299	struct sctp_tmit_chunk *chk, *at, *tp1, *last;
10300	struct sctp_forward_tsn_chunk *fwdtsn;
10301	struct sctp_strseq *strseq;
10302	struct sctp_strseq_mid *strseq_m;
10303	uint32_t advance_peer_ack_point;
10304	unsigned int cnt_of_space, i, ovh;
10305	unsigned int space_needed;
10306	unsigned int cnt_of_skipped = 0;
10307
10308	SCTP_TCB_LOCK_ASSERT(stcb);
10309	TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10310		if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
10311			/* mark it to unsent */
10312			chk->sent = SCTP_DATAGRAM_UNSENT;
10313			chk->snd_count = 0;
10314			/* Do we correct its output location? */
10315			if (chk->whoTo) {
10316				sctp_free_remote_addr(chk->whoTo);
10317				chk->whoTo = NULL;
10318			}
10319			goto sctp_fill_in_rest;
10320		}
10321	}
10322	/* Ok if we reach here we must build one */
10323	sctp_alloc_a_chunk(stcb, chk);
10324	if (chk == NULL) {
10325		return;
10326	}
10327	asoc->fwd_tsn_cnt++;
10328	chk->copy_by_ref = 0;
10329	/*
10330	 * We don't do the old thing here since this is used not for on-wire
10331	 * but to tell if we are sending a fwd-tsn by the stack during
10332	 * output. And if its a IFORWARD or a FORWARD it is a fwd-tsn.
10333	 */
10334	chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
10335	chk->rec.chunk_id.can_take_data = 0;
10336	chk->flags = 0;
10337	chk->asoc = asoc;
10338	chk->whoTo = NULL;
10339	chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
10340	if (chk->data == NULL) {
10341		sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
10342		return;
10343	}
10344	SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10345	chk->sent = SCTP_DATAGRAM_UNSENT;
10346	chk->snd_count = 0;
10347	TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
10348	asoc->ctrl_queue_cnt++;
10349sctp_fill_in_rest:
10350	/*-
10351	 * Here we go through and fill out the part that deals with
10352	 * stream/seq of the ones we skip.
10353	 */
10354	SCTP_BUF_LEN(chk->data) = 0;
10355	TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10356		if ((at->sent != SCTP_FORWARD_TSN_SKIP) &&
10357		    (at->sent != SCTP_DATAGRAM_NR_ACKED)) {
10358			/* no more to look at */
10359			break;
10360		}
10361		if (!asoc->idata_supported && (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
10362			/* We don't report these */
10363			continue;
10364		}
10365		cnt_of_skipped++;
10366	}
10367	if (asoc->idata_supported) {
10368		space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10369		    (cnt_of_skipped * sizeof(struct sctp_strseq_mid)));
10370	} else {
10371		space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10372		    (cnt_of_skipped * sizeof(struct sctp_strseq)));
10373	}
10374	cnt_of_space = (unsigned int)M_TRAILINGSPACE(chk->data);
10375
10376	if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
10377		ovh = SCTP_MIN_OVERHEAD;
10378	} else {
10379		ovh = SCTP_MIN_V4_OVERHEAD;
10380	}
10381	if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
10382		/* trim to a mtu size */
10383		cnt_of_space = asoc->smallest_mtu - ovh;
10384	}
10385	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10386		sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10387		    0xff, 0, cnt_of_skipped,
10388		    asoc->advanced_peer_ack_point);
10389	}
10390	advance_peer_ack_point = asoc->advanced_peer_ack_point;
10391	if (cnt_of_space < space_needed) {
10392		/*-
10393		 * ok we must trim down the chunk by lowering the
10394		 * advance peer ack point.
10395		 */
10396		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10397			sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10398			    0xff, 0xff, cnt_of_space,
10399			    space_needed);
10400		}
10401		cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
10402		if (asoc->idata_supported) {
10403			cnt_of_skipped /= sizeof(struct sctp_strseq_mid);
10404		} else {
10405			cnt_of_skipped /= sizeof(struct sctp_strseq);
10406		}
10407		/*-
10408		 * Go through and find the TSN that will be the one
10409		 * we report.
10410		 */
10411		at = TAILQ_FIRST(&asoc->sent_queue);
10412		if (at != NULL) {
10413			for (i = 0; i < cnt_of_skipped; i++) {
10414				tp1 = TAILQ_NEXT(at, sctp_next);
10415				if (tp1 == NULL) {
10416					break;
10417				}
10418				at = tp1;
10419			}
10420		}
10421		if (at && SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10422			sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10423			    0xff, cnt_of_skipped, at->rec.data.tsn,
10424			    asoc->advanced_peer_ack_point);
10425		}
10426		last = at;
10427		/*-
10428		 * last now points to last one I can report, update
10429		 * peer ack point
10430		 */
10431		if (last) {
10432			advance_peer_ack_point = last->rec.data.tsn;
10433		}
10434		if (asoc->idata_supported) {
10435			space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10436			    cnt_of_skipped * sizeof(struct sctp_strseq_mid);
10437		} else {
10438			space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10439			    cnt_of_skipped * sizeof(struct sctp_strseq);
10440		}
10441	}
10442	chk->send_size = space_needed;
10443	/* Setup the chunk */
10444	fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
10445	fwdtsn->ch.chunk_length = htons(chk->send_size);
10446	fwdtsn->ch.chunk_flags = 0;
10447	if (asoc->idata_supported) {
10448		fwdtsn->ch.chunk_type = SCTP_IFORWARD_CUM_TSN;
10449	} else {
10450		fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
10451	}
10452	fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
10453	SCTP_BUF_LEN(chk->data) = chk->send_size;
10454	fwdtsn++;
10455	/*-
10456	 * Move pointer to after the fwdtsn and transfer to the
10457	 * strseq pointer.
10458	 */
10459	if (asoc->idata_supported) {
10460		strseq_m = (struct sctp_strseq_mid *)fwdtsn;
10461		strseq = NULL;
10462	} else {
10463		strseq = (struct sctp_strseq *)fwdtsn;
10464		strseq_m = NULL;
10465	}
10466	/*-
10467	 * Now populate the strseq list. This is done blindly
10468	 * without pulling out duplicate stream info. This is
10469	 * inefficent but won't harm the process since the peer will
10470	 * look at these in sequence and will thus release anything.
10471	 * It could mean we exceed the PMTU and chop off some that
10472	 * we could have included.. but this is unlikely (aka 1432/4
10473	 * would mean 300+ stream seq's would have to be reported in
10474	 * one FWD-TSN. With a bit of work we can later FIX this to
10475	 * optimize and pull out duplicates.. but it does add more
10476	 * overhead. So for now... not!
10477	 */
10478	i = 0;
10479	TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10480		if (i >= cnt_of_skipped) {
10481			break;
10482		}
10483		if (!asoc->idata_supported && (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
10484			/* We don't report these */
10485			continue;
10486		}
10487		if (at->rec.data.tsn == advance_peer_ack_point) {
10488			at->rec.data.fwd_tsn_cnt = 0;
10489		}
10490		if (asoc->idata_supported) {
10491			strseq_m->sid = htons(at->rec.data.sid);
10492			if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10493				strseq_m->flags = htons(PR_SCTP_UNORDERED_FLAG);
10494			} else {
10495				strseq_m->flags = 0;
10496			}
10497			strseq_m->mid = htonl(at->rec.data.mid);
10498			strseq_m++;
10499		} else {
10500			strseq->sid = htons(at->rec.data.sid);
10501			strseq->ssn = htons((uint16_t)at->rec.data.mid);
10502			strseq++;
10503		}
10504		i++;
10505	}
10506	return;
10507}
10508
10509void
10510sctp_send_sack(struct sctp_tcb *stcb, int so_locked
10511#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10512    SCTP_UNUSED
10513#endif
10514)
10515{
10516	/*-
10517	 * Queue up a SACK or NR-SACK in the control queue.
10518	 * We must first check to see if a SACK or NR-SACK is
10519	 * somehow on the control queue.
10520	 * If so, we will take and and remove the old one.
10521	 */
10522	struct sctp_association *asoc;
10523	struct sctp_tmit_chunk *chk, *a_chk;
10524	struct sctp_sack_chunk *sack;
10525	struct sctp_nr_sack_chunk *nr_sack;
10526	struct sctp_gap_ack_block *gap_descriptor;
10527	const struct sack_track *selector;
10528	int mergeable = 0;
10529	int offset;
10530	caddr_t limit;
10531	uint32_t *dup;
10532	int limit_reached = 0;
10533	unsigned int i, siz, j;
10534	unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
10535	int num_dups = 0;
10536	int space_req;
10537	uint32_t highest_tsn;
10538	uint8_t flags;
10539	uint8_t type;
10540	uint8_t tsn_map;
10541
10542	if (stcb->asoc.nrsack_supported == 1) {
10543		type = SCTP_NR_SELECTIVE_ACK;
10544	} else {
10545		type = SCTP_SELECTIVE_ACK;
10546	}
10547	a_chk = NULL;
10548	asoc = &stcb->asoc;
10549	SCTP_TCB_LOCK_ASSERT(stcb);
10550	if (asoc->last_data_chunk_from == NULL) {
10551		/* Hmm we never received anything */
10552		return;
10553	}
10554	sctp_slide_mapping_arrays(stcb);
10555	sctp_set_rwnd(stcb, asoc);
10556	TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10557		if (chk->rec.chunk_id.id == type) {
10558			/* Hmm, found a sack already on queue, remove it */
10559			TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
10560			asoc->ctrl_queue_cnt--;
10561			a_chk = chk;
10562			if (a_chk->data) {
10563				sctp_m_freem(a_chk->data);
10564				a_chk->data = NULL;
10565			}
10566			if (a_chk->whoTo) {
10567				sctp_free_remote_addr(a_chk->whoTo);
10568				a_chk->whoTo = NULL;
10569			}
10570			break;
10571		}
10572	}
10573	if (a_chk == NULL) {
10574		sctp_alloc_a_chunk(stcb, a_chk);
10575		if (a_chk == NULL) {
10576			/* No memory so we drop the idea, and set a timer */
10577			if (stcb->asoc.delayed_ack) {
10578				sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10579				    stcb->sctp_ep, stcb, NULL,
10580				    SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_3);
10581				sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10582				    stcb->sctp_ep, stcb, NULL);
10583			} else {
10584				stcb->asoc.send_sack = 1;
10585			}
10586			return;
10587		}
10588		a_chk->copy_by_ref = 0;
10589		a_chk->rec.chunk_id.id = type;
10590		a_chk->rec.chunk_id.can_take_data = 1;
10591	}
10592	/* Clear our pkt counts */
10593	asoc->data_pkts_seen = 0;
10594
10595	a_chk->flags = 0;
10596	a_chk->asoc = asoc;
10597	a_chk->snd_count = 0;
10598	a_chk->send_size = 0;	/* fill in later */
10599	a_chk->sent = SCTP_DATAGRAM_UNSENT;
10600	a_chk->whoTo = NULL;
10601
10602	if (!(asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE)) {
10603		/*-
10604		 * Ok, the destination for the SACK is unreachable, lets see if
10605		 * we can select an alternate to asoc->last_data_chunk_from
10606		 */
10607		a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
10608		if (a_chk->whoTo == NULL) {
10609			/* Nope, no alternate */
10610			a_chk->whoTo = asoc->last_data_chunk_from;
10611		}
10612	} else {
10613		a_chk->whoTo = asoc->last_data_chunk_from;
10614	}
10615	if (a_chk->whoTo) {
10616		atomic_add_int(&a_chk->whoTo->ref_count, 1);
10617	}
10618	if (SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->highest_tsn_inside_nr_map)) {
10619		highest_tsn = asoc->highest_tsn_inside_map;
10620	} else {
10621		highest_tsn = asoc->highest_tsn_inside_nr_map;
10622	}
10623	if (highest_tsn == asoc->cumulative_tsn) {
10624		/* no gaps */
10625		if (type == SCTP_SELECTIVE_ACK) {
10626			space_req = sizeof(struct sctp_sack_chunk);
10627		} else {
10628			space_req = sizeof(struct sctp_nr_sack_chunk);
10629		}
10630	} else {
10631		/* gaps get a cluster */
10632		space_req = MCLBYTES;
10633	}
10634	/* Ok now lets formulate a MBUF with our sack */
10635	a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_NOWAIT, 1, MT_DATA);
10636	if ((a_chk->data == NULL) ||
10637	    (a_chk->whoTo == NULL)) {
10638		/* rats, no mbuf memory */
10639		if (a_chk->data) {
10640			/* was a problem with the destination */
10641			sctp_m_freem(a_chk->data);
10642			a_chk->data = NULL;
10643		}
10644		sctp_free_a_chunk(stcb, a_chk, so_locked);
10645		/* sa_ignore NO_NULL_CHK */
10646		if (stcb->asoc.delayed_ack) {
10647			sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10648			    stcb->sctp_ep, stcb, NULL,
10649			    SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
10650			sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10651			    stcb->sctp_ep, stcb, NULL);
10652		} else {
10653			stcb->asoc.send_sack = 1;
10654		}
10655		return;
10656	}
10657	/* ok, lets go through and fill it in */
10658	SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10659	space = (unsigned int)M_TRAILINGSPACE(a_chk->data);
10660	if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10661		space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10662	}
10663	limit = mtod(a_chk->data, caddr_t);
10664	limit += space;
10665
10666	flags = 0;
10667
10668	if ((asoc->sctp_cmt_on_off > 0) &&
10669	    SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10670		/*-
10671		 * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10672		 * received, then set high bit to 1, else 0. Reset
10673		 * pkts_rcvd.
10674		 */
10675		flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10676		asoc->cmt_dac_pkts_rcvd = 0;
10677	}
10678#ifdef SCTP_ASOCLOG_OF_TSNS
10679	stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10680	stcb->asoc.cumack_log_atsnt++;
10681	if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10682		stcb->asoc.cumack_log_atsnt = 0;
10683	}
10684#endif
10685	/* reset the readers interpretation */
10686	stcb->freed_by_sorcv_sincelast = 0;
10687
10688	if (type == SCTP_SELECTIVE_ACK) {
10689		sack = mtod(a_chk->data, struct sctp_sack_chunk *);
10690		nr_sack = NULL;
10691		gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
10692		if (highest_tsn > asoc->mapping_array_base_tsn) {
10693			siz = (((highest_tsn - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10694		} else {
10695			siz = (((MAX_TSN - highest_tsn) + 1) + highest_tsn + 7) / 8;
10696		}
10697	} else {
10698		sack = NULL;
10699		nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
10700		gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
10701		if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn) {
10702			siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10703		} else {
10704			siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10705		}
10706	}
10707
10708	if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10709		offset = 1;
10710	} else {
10711		offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10712	}
10713	if (((type == SCTP_SELECTIVE_ACK) &&
10714	    SCTP_TSN_GT(highest_tsn, asoc->cumulative_tsn)) ||
10715	    ((type == SCTP_NR_SELECTIVE_ACK) &&
10716	    SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->cumulative_tsn))) {
10717		/* we have a gap .. maybe */
10718		for (i = 0; i < siz; i++) {
10719			tsn_map = asoc->mapping_array[i];
10720			if (type == SCTP_SELECTIVE_ACK) {
10721				tsn_map |= asoc->nr_mapping_array[i];
10722			}
10723			if (i == 0) {
10724				/*
10725				 * Clear all bits corresponding to TSNs
10726				 * smaller or equal to the cumulative TSN.
10727				 */
10728				tsn_map &= (~0U << (1 - offset));
10729			}
10730			selector = &sack_array[tsn_map];
10731			if (mergeable && selector->right_edge) {
10732				/*
10733				 * Backup, left and right edges were ok to
10734				 * merge.
10735				 */
10736				num_gap_blocks--;
10737				gap_descriptor--;
10738			}
10739			if (selector->num_entries == 0)
10740				mergeable = 0;
10741			else {
10742				for (j = 0; j < selector->num_entries; j++) {
10743					if (mergeable && selector->right_edge) {
10744						/*
10745						 * do a merge by NOT setting
10746						 * the left side
10747						 */
10748						mergeable = 0;
10749					} else {
10750						/*
10751						 * no merge, set the left
10752						 * side
10753						 */
10754						mergeable = 0;
10755						gap_descriptor->start = htons((selector->gaps[j].start + offset));
10756					}
10757					gap_descriptor->end = htons((selector->gaps[j].end + offset));
10758					num_gap_blocks++;
10759					gap_descriptor++;
10760					if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10761						/* no more room */
10762						limit_reached = 1;
10763						break;
10764					}
10765				}
10766				if (selector->left_edge) {
10767					mergeable = 1;
10768				}
10769			}
10770			if (limit_reached) {
10771				/* Reached the limit stop */
10772				break;
10773			}
10774			offset += 8;
10775		}
10776	}
10777	if ((type == SCTP_NR_SELECTIVE_ACK) &&
10778	    (limit_reached == 0)) {
10779
10780		mergeable = 0;
10781
10782		if (asoc->highest_tsn_inside_nr_map > asoc->mapping_array_base_tsn) {
10783			siz = (((asoc->highest_tsn_inside_nr_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10784		} else {
10785			siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10786		}
10787
10788		if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10789			offset = 1;
10790		} else {
10791			offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10792		}
10793		if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn)) {
10794			/* we have a gap .. maybe */
10795			for (i = 0; i < siz; i++) {
10796				tsn_map = asoc->nr_mapping_array[i];
10797				if (i == 0) {
10798					/*
10799					 * Clear all bits corresponding to
10800					 * TSNs smaller or equal to the
10801					 * cumulative TSN.
10802					 */
10803					tsn_map &= (~0U << (1 - offset));
10804				}
10805				selector = &sack_array[tsn_map];
10806				if (mergeable && selector->right_edge) {
10807					/*
10808					 * Backup, left and right edges were
10809					 * ok to merge.
10810					 */
10811					num_nr_gap_blocks--;
10812					gap_descriptor--;
10813				}
10814				if (selector->num_entries == 0)
10815					mergeable = 0;
10816				else {
10817					for (j = 0; j < selector->num_entries; j++) {
10818						if (mergeable && selector->right_edge) {
10819							/*
10820							 * do a merge by NOT
10821							 * setting the left
10822							 * side
10823							 */
10824							mergeable = 0;
10825						} else {
10826							/*
10827							 * no merge, set the
10828							 * left side
10829							 */
10830							mergeable = 0;
10831							gap_descriptor->start = htons((selector->gaps[j].start + offset));
10832						}
10833						gap_descriptor->end = htons((selector->gaps[j].end + offset));
10834						num_nr_gap_blocks++;
10835						gap_descriptor++;
10836						if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10837							/* no more room */
10838							limit_reached = 1;
10839							break;
10840						}
10841					}
10842					if (selector->left_edge) {
10843						mergeable = 1;
10844					}
10845				}
10846				if (limit_reached) {
10847					/* Reached the limit stop */
10848					break;
10849				}
10850				offset += 8;
10851			}
10852		}
10853	}
10854	/* now we must add any dups we are going to report. */
10855	if ((limit_reached == 0) && (asoc->numduptsns)) {
10856		dup = (uint32_t *)gap_descriptor;
10857		for (i = 0; i < asoc->numduptsns; i++) {
10858			*dup = htonl(asoc->dup_tsns[i]);
10859			dup++;
10860			num_dups++;
10861			if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10862				/* no more room */
10863				break;
10864			}
10865		}
10866		asoc->numduptsns = 0;
10867	}
10868	/*
10869	 * now that the chunk is prepared queue it to the control chunk
10870	 * queue.
10871	 */
10872	if (type == SCTP_SELECTIVE_ACK) {
10873		a_chk->send_size = (uint16_t)(sizeof(struct sctp_sack_chunk) +
10874		    (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10875		    num_dups * sizeof(int32_t));
10876		SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10877		sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10878		sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10879		sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10880		sack->sack.num_dup_tsns = htons(num_dups);
10881		sack->ch.chunk_type = type;
10882		sack->ch.chunk_flags = flags;
10883		sack->ch.chunk_length = htons(a_chk->send_size);
10884	} else {
10885		a_chk->send_size = (uint16_t)(sizeof(struct sctp_nr_sack_chunk) +
10886		    (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10887		    num_dups * sizeof(int32_t));
10888		SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10889		nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10890		nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10891		nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10892		nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10893		nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10894		nr_sack->nr_sack.reserved = 0;
10895		nr_sack->ch.chunk_type = type;
10896		nr_sack->ch.chunk_flags = flags;
10897		nr_sack->ch.chunk_length = htons(a_chk->send_size);
10898	}
10899	TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10900	asoc->my_last_reported_rwnd = asoc->my_rwnd;
10901	asoc->ctrl_queue_cnt++;
10902	asoc->send_sack = 0;
10903	SCTP_STAT_INCR(sctps_sendsacks);
10904	return;
10905}
10906
10907void
10908sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked
10909#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10910    SCTP_UNUSED
10911#endif
10912)
10913{
10914	struct mbuf *m_abort, *m, *m_last;
10915	struct mbuf *m_out, *m_end = NULL;
10916	struct sctp_abort_chunk *abort;
10917	struct sctp_auth_chunk *auth = NULL;
10918	struct sctp_nets *net;
10919	uint32_t vtag;
10920	uint32_t auth_offset = 0;
10921	int error;
10922	uint16_t cause_len, chunk_len, padding_len;
10923
10924	SCTP_TCB_LOCK_ASSERT(stcb);
10925	/*-
10926	 * Add an AUTH chunk, if chunk requires it and save the offset into
10927	 * the chain for AUTH
10928	 */
10929	if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10930	    stcb->asoc.peer_auth_chunks)) {
10931		m_out = sctp_add_auth_chunk(NULL, &m_end, &auth, &auth_offset,
10932		    stcb, SCTP_ABORT_ASSOCIATION);
10933		SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10934	} else {
10935		m_out = NULL;
10936	}
10937	m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_NOWAIT, 1, MT_HEADER);
10938	if (m_abort == NULL) {
10939		if (m_out) {
10940			sctp_m_freem(m_out);
10941		}
10942		if (operr) {
10943			sctp_m_freem(operr);
10944		}
10945		return;
10946	}
10947	/* link in any error */
10948	SCTP_BUF_NEXT(m_abort) = operr;
10949	cause_len = 0;
10950	m_last = NULL;
10951	for (m = operr; m; m = SCTP_BUF_NEXT(m)) {
10952		cause_len += (uint16_t)SCTP_BUF_LEN(m);
10953		if (SCTP_BUF_NEXT(m) == NULL) {
10954			m_last = m;
10955		}
10956	}
10957	SCTP_BUF_LEN(m_abort) = sizeof(struct sctp_abort_chunk);
10958	chunk_len = (uint16_t)sizeof(struct sctp_abort_chunk) + cause_len;
10959	padding_len = SCTP_SIZE32(chunk_len) - chunk_len;
10960	if (m_out == NULL) {
10961		/* NO Auth chunk prepended, so reserve space in front */
10962		SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10963		m_out = m_abort;
10964	} else {
10965		/* Put AUTH chunk at the front of the chain */
10966		SCTP_BUF_NEXT(m_end) = m_abort;
10967	}
10968	if (stcb->asoc.alternate) {
10969		net = stcb->asoc.alternate;
10970	} else {
10971		net = stcb->asoc.primary_destination;
10972	}
10973	/* Fill in the ABORT chunk header. */
10974	abort = mtod(m_abort, struct sctp_abort_chunk *);
10975	abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10976	if (stcb->asoc.peer_vtag == 0) {
10977		/* This happens iff the assoc is in COOKIE-WAIT state. */
10978		vtag = stcb->asoc.my_vtag;
10979		abort->ch.chunk_flags = SCTP_HAD_NO_TCB;
10980	} else {
10981		vtag = stcb->asoc.peer_vtag;
10982		abort->ch.chunk_flags = 0;
10983	}
10984	abort->ch.chunk_length = htons(chunk_len);
10985	/* Add padding, if necessary. */
10986	if (padding_len > 0) {
10987		if ((m_last == NULL) ||
10988		    (sctp_add_pad_tombuf(m_last, padding_len) == NULL)) {
10989			sctp_m_freem(m_out);
10990			return;
10991		}
10992	}
10993	if ((error = sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10994	    (struct sockaddr *)&net->ro._l_addr,
10995	    m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, 0,
10996	    stcb->sctp_ep->sctp_lport, stcb->rport, htonl(vtag),
10997	    stcb->asoc.primary_destination->port, NULL,
10998	    0, 0,
10999	    so_locked))) {
11000		SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
11001		if (error == ENOBUFS) {
11002			stcb->asoc.ifp_had_enobuf = 1;
11003			SCTP_STAT_INCR(sctps_lowlevelerr);
11004		}
11005	} else {
11006		stcb->asoc.ifp_had_enobuf = 0;
11007	}
11008	SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11009}
11010
11011void
11012sctp_send_shutdown_complete(struct sctp_tcb *stcb,
11013    struct sctp_nets *net,
11014    int reflect_vtag)
11015{
11016	/* formulate and SEND a SHUTDOWN-COMPLETE */
11017	struct mbuf *m_shutdown_comp;
11018	struct sctp_shutdown_complete_chunk *shutdown_complete;
11019	uint32_t vtag;
11020	int error;
11021	uint8_t flags;
11022
11023	m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
11024	if (m_shutdown_comp == NULL) {
11025		/* no mbuf's */
11026		return;
11027	}
11028	if (reflect_vtag) {
11029		flags = SCTP_HAD_NO_TCB;
11030		vtag = stcb->asoc.my_vtag;
11031	} else {
11032		flags = 0;
11033		vtag = stcb->asoc.peer_vtag;
11034	}
11035	shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
11036	shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
11037	shutdown_complete->ch.chunk_flags = flags;
11038	shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
11039	SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
11040	if ((error = sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
11041	    (struct sockaddr *)&net->ro._l_addr,
11042	    m_shutdown_comp, 0, NULL, 0, 1, 0, 0,
11043	    stcb->sctp_ep->sctp_lport, stcb->rport,
11044	    htonl(vtag),
11045	    net->port, NULL,
11046	    0, 0,
11047	    SCTP_SO_NOT_LOCKED))) {
11048		SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
11049		if (error == ENOBUFS) {
11050			stcb->asoc.ifp_had_enobuf = 1;
11051			SCTP_STAT_INCR(sctps_lowlevelerr);
11052		}
11053	} else {
11054		stcb->asoc.ifp_had_enobuf = 0;
11055	}
11056	SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11057	return;
11058}
11059
11060static void
11061sctp_send_resp_msg(struct sockaddr *src, struct sockaddr *dst,
11062    struct sctphdr *sh, uint32_t vtag,
11063    uint8_t type, struct mbuf *cause,
11064    uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
11065    uint32_t vrf_id, uint16_t port)
11066{
11067	struct mbuf *o_pak;
11068	struct mbuf *mout;
11069	struct sctphdr *shout;
11070	struct sctp_chunkhdr *ch;
11071#if defined(INET) || defined(INET6)
11072	struct udphdr *udp;
11073	int ret;
11074#endif
11075	int len, cause_len, padding_len;
11076#ifdef INET
11077	struct sockaddr_in *src_sin, *dst_sin;
11078	struct ip *ip;
11079#endif
11080#ifdef INET6
11081	struct sockaddr_in6 *src_sin6, *dst_sin6;
11082	struct ip6_hdr *ip6;
11083#endif
11084
11085	/* Compute the length of the cause and add final padding. */
11086	cause_len = 0;
11087	if (cause != NULL) {
11088		struct mbuf *m_at, *m_last = NULL;
11089
11090		for (m_at = cause; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
11091			if (SCTP_BUF_NEXT(m_at) == NULL)
11092				m_last = m_at;
11093			cause_len += SCTP_BUF_LEN(m_at);
11094		}
11095		padding_len = cause_len % 4;
11096		if (padding_len != 0) {
11097			padding_len = 4 - padding_len;
11098		}
11099		if (padding_len != 0) {
11100			if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
11101				sctp_m_freem(cause);
11102				return;
11103			}
11104		}
11105	} else {
11106		padding_len = 0;
11107	}
11108	/* Get an mbuf for the header. */
11109	len = sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
11110	switch (dst->sa_family) {
11111#ifdef INET
11112	case AF_INET:
11113		len += sizeof(struct ip);
11114		break;
11115#endif
11116#ifdef INET6
11117	case AF_INET6:
11118		len += sizeof(struct ip6_hdr);
11119		break;
11120#endif
11121	default:
11122		break;
11123	}
11124#if defined(INET) || defined(INET6)
11125	if (port) {
11126		len += sizeof(struct udphdr);
11127	}
11128#endif
11129	mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_NOWAIT, 1, MT_DATA);
11130	if (mout == NULL) {
11131		if (cause) {
11132			sctp_m_freem(cause);
11133		}
11134		return;
11135	}
11136	SCTP_BUF_RESV_UF(mout, max_linkhdr);
11137	SCTP_BUF_LEN(mout) = len;
11138	SCTP_BUF_NEXT(mout) = cause;
11139	M_SETFIB(mout, fibnum);
11140	mout->m_pkthdr.flowid = mflowid;
11141	M_HASHTYPE_SET(mout, mflowtype);
11142#ifdef INET
11143	ip = NULL;
11144#endif
11145#ifdef INET6
11146	ip6 = NULL;
11147#endif
11148	switch (dst->sa_family) {
11149#ifdef INET
11150	case AF_INET:
11151		src_sin = (struct sockaddr_in *)src;
11152		dst_sin = (struct sockaddr_in *)dst;
11153		ip = mtod(mout, struct ip *);
11154		ip->ip_v = IPVERSION;
11155		ip->ip_hl = (sizeof(struct ip) >> 2);
11156		ip->ip_tos = 0;
11157		ip->ip_off = htons(IP_DF);
11158		ip_fillid(ip);
11159		ip->ip_ttl = MODULE_GLOBAL(ip_defttl);
11160		if (port) {
11161			ip->ip_p = IPPROTO_UDP;
11162		} else {
11163			ip->ip_p = IPPROTO_SCTP;
11164		}
11165		ip->ip_src.s_addr = dst_sin->sin_addr.s_addr;
11166		ip->ip_dst.s_addr = src_sin->sin_addr.s_addr;
11167		ip->ip_sum = 0;
11168		len = sizeof(struct ip);
11169		shout = (struct sctphdr *)((caddr_t)ip + len);
11170		break;
11171#endif
11172#ifdef INET6
11173	case AF_INET6:
11174		src_sin6 = (struct sockaddr_in6 *)src;
11175		dst_sin6 = (struct sockaddr_in6 *)dst;
11176		ip6 = mtod(mout, struct ip6_hdr *);
11177		ip6->ip6_flow = htonl(0x60000000);
11178		if (V_ip6_auto_flowlabel) {
11179			ip6->ip6_flow |= (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
11180		}
11181		ip6->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
11182		if (port) {
11183			ip6->ip6_nxt = IPPROTO_UDP;
11184		} else {
11185			ip6->ip6_nxt = IPPROTO_SCTP;
11186		}
11187		ip6->ip6_src = dst_sin6->sin6_addr;
11188		ip6->ip6_dst = src_sin6->sin6_addr;
11189		len = sizeof(struct ip6_hdr);
11190		shout = (struct sctphdr *)((caddr_t)ip6 + len);
11191		break;
11192#endif
11193	default:
11194		len = 0;
11195		shout = mtod(mout, struct sctphdr *);
11196		break;
11197	}
11198#if defined(INET) || defined(INET6)
11199	if (port) {
11200		if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
11201			sctp_m_freem(mout);
11202			return;
11203		}
11204		udp = (struct udphdr *)shout;
11205		udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
11206		udp->uh_dport = port;
11207		udp->uh_sum = 0;
11208		udp->uh_ulen = htons((uint16_t)(sizeof(struct udphdr) +
11209		    sizeof(struct sctphdr) +
11210		    sizeof(struct sctp_chunkhdr) +
11211		    cause_len + padding_len));
11212		len += sizeof(struct udphdr);
11213		shout = (struct sctphdr *)((caddr_t)shout + sizeof(struct udphdr));
11214	} else {
11215		udp = NULL;
11216	}
11217#endif
11218	shout->src_port = sh->dest_port;
11219	shout->dest_port = sh->src_port;
11220	shout->checksum = 0;
11221	if (vtag) {
11222		shout->v_tag = htonl(vtag);
11223	} else {
11224		shout->v_tag = sh->v_tag;
11225	}
11226	len += sizeof(struct sctphdr);
11227	ch = (struct sctp_chunkhdr *)((caddr_t)shout + sizeof(struct sctphdr));
11228	ch->chunk_type = type;
11229	if (vtag) {
11230		ch->chunk_flags = 0;
11231	} else {
11232		ch->chunk_flags = SCTP_HAD_NO_TCB;
11233	}
11234	ch->chunk_length = htons((uint16_t)(sizeof(struct sctp_chunkhdr) + cause_len));
11235	len += sizeof(struct sctp_chunkhdr);
11236	len += cause_len + padding_len;
11237
11238	if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
11239		sctp_m_freem(mout);
11240		return;
11241	}
11242	SCTP_ATTACH_CHAIN(o_pak, mout, len);
11243	switch (dst->sa_family) {
11244#ifdef INET
11245	case AF_INET:
11246		if (port) {
11247			if (V_udp_cksum) {
11248				udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
11249			} else {
11250				udp->uh_sum = 0;
11251			}
11252		}
11253		ip->ip_len = htons(len);
11254		if (port) {
11255#if defined(SCTP_WITH_NO_CSUM)
11256			SCTP_STAT_INCR(sctps_sendnocrc);
11257#else
11258			shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip) + sizeof(struct udphdr));
11259			SCTP_STAT_INCR(sctps_sendswcrc);
11260#endif
11261			if (V_udp_cksum) {
11262				SCTP_ENABLE_UDP_CSUM(o_pak);
11263			}
11264		} else {
11265#if defined(SCTP_WITH_NO_CSUM)
11266			SCTP_STAT_INCR(sctps_sendnocrc);
11267#else
11268			mout->m_pkthdr.csum_flags = CSUM_SCTP;
11269			mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11270			SCTP_STAT_INCR(sctps_sendhwcrc);
11271#endif
11272		}
11273#ifdef SCTP_PACKET_LOGGING
11274		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11275			sctp_packet_log(o_pak);
11276		}
11277#endif
11278		SCTP_IP_OUTPUT(ret, o_pak, NULL, NULL, vrf_id);
11279		break;
11280#endif
11281#ifdef INET6
11282	case AF_INET6:
11283		ip6->ip6_plen = (uint16_t)(len - sizeof(struct ip6_hdr));
11284		if (port) {
11285#if defined(SCTP_WITH_NO_CSUM)
11286			SCTP_STAT_INCR(sctps_sendnocrc);
11287#else
11288			shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11289			SCTP_STAT_INCR(sctps_sendswcrc);
11290#endif
11291			if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11292				udp->uh_sum = 0xffff;
11293			}
11294		} else {
11295#if defined(SCTP_WITH_NO_CSUM)
11296			SCTP_STAT_INCR(sctps_sendnocrc);
11297#else
11298			mout->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
11299			mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11300			SCTP_STAT_INCR(sctps_sendhwcrc);
11301#endif
11302		}
11303#ifdef SCTP_PACKET_LOGGING
11304		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11305			sctp_packet_log(o_pak);
11306		}
11307#endif
11308		SCTP_IP6_OUTPUT(ret, o_pak, NULL, NULL, NULL, vrf_id);
11309		break;
11310#endif
11311	default:
11312		SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
11313		    dst->sa_family);
11314		sctp_m_freem(mout);
11315		SCTP_LTRACE_ERR_RET_PKT(mout, NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11316		return;
11317	}
11318	SCTP_STAT_INCR(sctps_sendpackets);
11319	SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11320	SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11321	return;
11322}
11323
11324void
11325sctp_send_shutdown_complete2(struct sockaddr *src, struct sockaddr *dst,
11326    struct sctphdr *sh,
11327    uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
11328    uint32_t vrf_id, uint16_t port)
11329{
11330	sctp_send_resp_msg(src, dst, sh, 0, SCTP_SHUTDOWN_COMPLETE, NULL,
11331	    mflowtype, mflowid, fibnum,
11332	    vrf_id, port);
11333}
11334
11335void
11336sctp_send_hb(struct sctp_tcb *stcb, struct sctp_nets *net, int so_locked
11337#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
11338    SCTP_UNUSED
11339#endif
11340)
11341{
11342	struct sctp_tmit_chunk *chk;
11343	struct sctp_heartbeat_chunk *hb;
11344	struct timeval now;
11345
11346	SCTP_TCB_LOCK_ASSERT(stcb);
11347	if (net == NULL) {
11348		return;
11349	}
11350	(void)SCTP_GETTIME_TIMEVAL(&now);
11351	switch (net->ro._l_addr.sa.sa_family) {
11352#ifdef INET
11353	case AF_INET:
11354		break;
11355#endif
11356#ifdef INET6
11357	case AF_INET6:
11358		break;
11359#endif
11360	default:
11361		return;
11362	}
11363	sctp_alloc_a_chunk(stcb, chk);
11364	if (chk == NULL) {
11365		SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
11366		return;
11367	}
11368	chk->copy_by_ref = 0;
11369	chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
11370	chk->rec.chunk_id.can_take_data = 1;
11371	chk->flags = 0;
11372	chk->asoc = &stcb->asoc;
11373	chk->send_size = sizeof(struct sctp_heartbeat_chunk);
11374
11375	chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11376	if (chk->data == NULL) {
11377		sctp_free_a_chunk(stcb, chk, so_locked);
11378		return;
11379	}
11380	SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11381	SCTP_BUF_LEN(chk->data) = chk->send_size;
11382	chk->sent = SCTP_DATAGRAM_UNSENT;
11383	chk->snd_count = 0;
11384	chk->whoTo = net;
11385	atomic_add_int(&chk->whoTo->ref_count, 1);
11386	/* Now we have a mbuf that we can fill in with the details */
11387	hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
11388	memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
11389	/* fill out chunk header */
11390	hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
11391	hb->ch.chunk_flags = 0;
11392	hb->ch.chunk_length = htons(chk->send_size);
11393	/* Fill out hb parameter */
11394	hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
11395	hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
11396	hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
11397	hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
11398	/* Did our user request this one, put it in */
11399	hb->heartbeat.hb_info.addr_family = (uint8_t)net->ro._l_addr.sa.sa_family;
11400	hb->heartbeat.hb_info.addr_len = net->ro._l_addr.sa.sa_len;
11401	if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
11402		/*
11403		 * we only take from the entropy pool if the address is not
11404		 * confirmed.
11405		 */
11406		net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11407		net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11408	} else {
11409		net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
11410		net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
11411	}
11412	switch (net->ro._l_addr.sa.sa_family) {
11413#ifdef INET
11414	case AF_INET:
11415		memcpy(hb->heartbeat.hb_info.address,
11416		    &net->ro._l_addr.sin.sin_addr,
11417		    sizeof(net->ro._l_addr.sin.sin_addr));
11418		break;
11419#endif
11420#ifdef INET6
11421	case AF_INET6:
11422		memcpy(hb->heartbeat.hb_info.address,
11423		    &net->ro._l_addr.sin6.sin6_addr,
11424		    sizeof(net->ro._l_addr.sin6.sin6_addr));
11425		break;
11426#endif
11427	default:
11428		if (chk->data) {
11429			sctp_m_freem(chk->data);
11430			chk->data = NULL;
11431		}
11432		sctp_free_a_chunk(stcb, chk, so_locked);
11433		return;
11434		break;
11435	}
11436	net->hb_responded = 0;
11437	TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11438	stcb->asoc.ctrl_queue_cnt++;
11439	SCTP_STAT_INCR(sctps_sendheartbeat);
11440	return;
11441}
11442
11443void
11444sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
11445    uint32_t high_tsn)
11446{
11447	struct sctp_association *asoc;
11448	struct sctp_ecne_chunk *ecne;
11449	struct sctp_tmit_chunk *chk;
11450
11451	if (net == NULL) {
11452		return;
11453	}
11454	asoc = &stcb->asoc;
11455	SCTP_TCB_LOCK_ASSERT(stcb);
11456	TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11457		if ((chk->rec.chunk_id.id == SCTP_ECN_ECHO) && (net == chk->whoTo)) {
11458			/* found a previous ECN_ECHO update it if needed */
11459			uint32_t cnt, ctsn;
11460
11461			ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11462			ctsn = ntohl(ecne->tsn);
11463			if (SCTP_TSN_GT(high_tsn, ctsn)) {
11464				ecne->tsn = htonl(high_tsn);
11465				SCTP_STAT_INCR(sctps_queue_upd_ecne);
11466			}
11467			cnt = ntohl(ecne->num_pkts_since_cwr);
11468			cnt++;
11469			ecne->num_pkts_since_cwr = htonl(cnt);
11470			return;
11471		}
11472	}
11473	/* nope could not find one to update so we must build one */
11474	sctp_alloc_a_chunk(stcb, chk);
11475	if (chk == NULL) {
11476		return;
11477	}
11478	SCTP_STAT_INCR(sctps_queue_upd_ecne);
11479	chk->copy_by_ref = 0;
11480	chk->rec.chunk_id.id = SCTP_ECN_ECHO;
11481	chk->rec.chunk_id.can_take_data = 0;
11482	chk->flags = 0;
11483	chk->asoc = &stcb->asoc;
11484	chk->send_size = sizeof(struct sctp_ecne_chunk);
11485	chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11486	if (chk->data == NULL) {
11487		sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11488		return;
11489	}
11490	SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11491	SCTP_BUF_LEN(chk->data) = chk->send_size;
11492	chk->sent = SCTP_DATAGRAM_UNSENT;
11493	chk->snd_count = 0;
11494	chk->whoTo = net;
11495	atomic_add_int(&chk->whoTo->ref_count, 1);
11496
11497	stcb->asoc.ecn_echo_cnt_onq++;
11498	ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11499	ecne->ch.chunk_type = SCTP_ECN_ECHO;
11500	ecne->ch.chunk_flags = 0;
11501	ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
11502	ecne->tsn = htonl(high_tsn);
11503	ecne->num_pkts_since_cwr = htonl(1);
11504	TAILQ_INSERT_HEAD(&stcb->asoc.control_send_queue, chk, sctp_next);
11505	asoc->ctrl_queue_cnt++;
11506}
11507
11508void
11509sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
11510    struct mbuf *m, int len, int iphlen, int bad_crc)
11511{
11512	struct sctp_association *asoc;
11513	struct sctp_pktdrop_chunk *drp;
11514	struct sctp_tmit_chunk *chk;
11515	uint8_t *datap;
11516	int was_trunc = 0;
11517	int fullsz = 0;
11518	long spc;
11519	int offset;
11520	struct sctp_chunkhdr *ch, chunk_buf;
11521	unsigned int chk_length;
11522
11523	if (!stcb) {
11524		return;
11525	}
11526	asoc = &stcb->asoc;
11527	SCTP_TCB_LOCK_ASSERT(stcb);
11528	if (asoc->pktdrop_supported == 0) {
11529		/*-
11530		 * peer must declare support before I send one.
11531		 */
11532		return;
11533	}
11534	if (stcb->sctp_socket == NULL) {
11535		return;
11536	}
11537	sctp_alloc_a_chunk(stcb, chk);
11538	if (chk == NULL) {
11539		return;
11540	}
11541	chk->copy_by_ref = 0;
11542	chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
11543	chk->rec.chunk_id.can_take_data = 1;
11544	chk->flags = 0;
11545	len -= iphlen;
11546	chk->send_size = len;
11547	/* Validate that we do not have an ABORT in here. */
11548	offset = iphlen + sizeof(struct sctphdr);
11549	ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11550	    sizeof(*ch), (uint8_t *)&chunk_buf);
11551	while (ch != NULL) {
11552		chk_length = ntohs(ch->chunk_length);
11553		if (chk_length < sizeof(*ch)) {
11554			/* break to abort land */
11555			break;
11556		}
11557		switch (ch->chunk_type) {
11558		case SCTP_PACKET_DROPPED:
11559		case SCTP_ABORT_ASSOCIATION:
11560		case SCTP_INITIATION_ACK:
11561			/**
11562			 * We don't respond with an PKT-DROP to an ABORT
11563			 * or PKT-DROP. We also do not respond to an
11564			 * INIT-ACK, because we can't know if the initiation
11565			 * tag is correct or not.
11566			 */
11567			sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11568			return;
11569		default:
11570			break;
11571		}
11572		offset += SCTP_SIZE32(chk_length);
11573		ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11574		    sizeof(*ch), (uint8_t *)&chunk_buf);
11575	}
11576
11577	if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
11578	    min(stcb->asoc.smallest_mtu, MCLBYTES)) {
11579		/*
11580		 * only send 1 mtu worth, trim off the excess on the end.
11581		 */
11582		fullsz = len;
11583		len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
11584		was_trunc = 1;
11585	}
11586	chk->asoc = &stcb->asoc;
11587	chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11588	if (chk->data == NULL) {
11589jump_out:
11590		sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11591		return;
11592	}
11593	SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11594	drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
11595	if (drp == NULL) {
11596		sctp_m_freem(chk->data);
11597		chk->data = NULL;
11598		goto jump_out;
11599	}
11600	chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
11601	    sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
11602	chk->book_size_scale = 0;
11603	if (was_trunc) {
11604		drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
11605		drp->trunc_len = htons(fullsz);
11606		/*
11607		 * Len is already adjusted to size minus overhead above take
11608		 * out the pkt_drop chunk itself from it.
11609		 */
11610		chk->send_size = (uint16_t)(len - sizeof(struct sctp_pktdrop_chunk));
11611		len = chk->send_size;
11612	} else {
11613		/* no truncation needed */
11614		drp->ch.chunk_flags = 0;
11615		drp->trunc_len = htons(0);
11616	}
11617	if (bad_crc) {
11618		drp->ch.chunk_flags |= SCTP_BADCRC;
11619	}
11620	chk->send_size += sizeof(struct sctp_pktdrop_chunk);
11621	SCTP_BUF_LEN(chk->data) = chk->send_size;
11622	chk->sent = SCTP_DATAGRAM_UNSENT;
11623	chk->snd_count = 0;
11624	if (net) {
11625		/* we should hit here */
11626		chk->whoTo = net;
11627		atomic_add_int(&chk->whoTo->ref_count, 1);
11628	} else {
11629		chk->whoTo = NULL;
11630	}
11631	drp->ch.chunk_type = SCTP_PACKET_DROPPED;
11632	drp->ch.chunk_length = htons(chk->send_size);
11633	spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
11634	if (spc < 0) {
11635		spc = 0;
11636	}
11637	drp->bottle_bw = htonl(spc);
11638	if (asoc->my_rwnd) {
11639		drp->current_onq = htonl(asoc->size_on_reasm_queue +
11640		    asoc->size_on_all_streams +
11641		    asoc->my_rwnd_control_len +
11642		    stcb->sctp_socket->so_rcv.sb_cc);
11643	} else {
11644		/*-
11645		 * If my rwnd is 0, possibly from mbuf depletion as well as
11646		 * space used, tell the peer there is NO space aka onq == bw
11647		 */
11648		drp->current_onq = htonl(spc);
11649	}
11650	drp->reserved = 0;
11651	datap = drp->data;
11652	m_copydata(m, iphlen, len, (caddr_t)datap);
11653	TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11654	asoc->ctrl_queue_cnt++;
11655}
11656
11657void
11658sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn, uint8_t override)
11659{
11660	struct sctp_association *asoc;
11661	struct sctp_cwr_chunk *cwr;
11662	struct sctp_tmit_chunk *chk;
11663
11664	SCTP_TCB_LOCK_ASSERT(stcb);
11665	if (net == NULL) {
11666		return;
11667	}
11668	asoc = &stcb->asoc;
11669	TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11670		if ((chk->rec.chunk_id.id == SCTP_ECN_CWR) && (net == chk->whoTo)) {
11671			/*
11672			 * found a previous CWR queued to same destination
11673			 * update it if needed
11674			 */
11675			uint32_t ctsn;
11676
11677			cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11678			ctsn = ntohl(cwr->tsn);
11679			if (SCTP_TSN_GT(high_tsn, ctsn)) {
11680				cwr->tsn = htonl(high_tsn);
11681			}
11682			if (override & SCTP_CWR_REDUCE_OVERRIDE) {
11683				/* Make sure override is carried */
11684				cwr->ch.chunk_flags |= SCTP_CWR_REDUCE_OVERRIDE;
11685			}
11686			return;
11687		}
11688	}
11689	sctp_alloc_a_chunk(stcb, chk);
11690	if (chk == NULL) {
11691		return;
11692	}
11693	chk->copy_by_ref = 0;
11694	chk->rec.chunk_id.id = SCTP_ECN_CWR;
11695	chk->rec.chunk_id.can_take_data = 1;
11696	chk->flags = 0;
11697	chk->asoc = &stcb->asoc;
11698	chk->send_size = sizeof(struct sctp_cwr_chunk);
11699	chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11700	if (chk->data == NULL) {
11701		sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11702		return;
11703	}
11704	SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11705	SCTP_BUF_LEN(chk->data) = chk->send_size;
11706	chk->sent = SCTP_DATAGRAM_UNSENT;
11707	chk->snd_count = 0;
11708	chk->whoTo = net;
11709	atomic_add_int(&chk->whoTo->ref_count, 1);
11710	cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11711	cwr->ch.chunk_type = SCTP_ECN_CWR;
11712	cwr->ch.chunk_flags = override;
11713	cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
11714	cwr->tsn = htonl(high_tsn);
11715	TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11716	asoc->ctrl_queue_cnt++;
11717}
11718
11719static int
11720sctp_add_stream_reset_out(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
11721    uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
11722{
11723	uint16_t len, old_len, i;
11724	struct sctp_stream_reset_out_request *req_out;
11725	struct sctp_chunkhdr *ch;
11726	int at;
11727	int number_entries = 0;
11728
11729	ch = mtod(chk->data, struct sctp_chunkhdr *);
11730	old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11731	/* get to new offset for the param. */
11732	req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
11733	/* now how long will this param be? */
11734	for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11735		if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11736		    (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11737		    TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11738			number_entries++;
11739		}
11740	}
11741	if (number_entries == 0) {
11742		return (0);
11743	}
11744	if (number_entries == stcb->asoc.streamoutcnt) {
11745		number_entries = 0;
11746	}
11747	if (number_entries > SCTP_MAX_STREAMS_AT_ONCE_RESET) {
11748		number_entries = SCTP_MAX_STREAMS_AT_ONCE_RESET;
11749	}
11750	len = (uint16_t)(sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
11751	req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
11752	req_out->ph.param_length = htons(len);
11753	req_out->request_seq = htonl(seq);
11754	req_out->response_seq = htonl(resp_seq);
11755	req_out->send_reset_at_tsn = htonl(last_sent);
11756	at = 0;
11757	if (number_entries) {
11758		for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11759			if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11760			    (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11761			    TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11762				req_out->list_of_streams[at] = htons(i);
11763				at++;
11764				stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11765				if (at >= number_entries) {
11766					break;
11767				}
11768			}
11769		}
11770	} else {
11771		for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11772			stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11773		}
11774	}
11775	if (SCTP_SIZE32(len) > len) {
11776		/*-
11777		 * Need to worry about the pad we may end up adding to the
11778		 * end. This is easy since the struct is either aligned to 4
11779		 * bytes or 2 bytes off.
11780		 */
11781		req_out->list_of_streams[number_entries] = 0;
11782	}
11783	/* now fix the chunk length */
11784	ch->chunk_length = htons(len + old_len);
11785	chk->book_size = len + old_len;
11786	chk->book_size_scale = 0;
11787	chk->send_size = SCTP_SIZE32(chk->book_size);
11788	SCTP_BUF_LEN(chk->data) = chk->send_size;
11789	return (1);
11790}
11791
11792static void
11793sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
11794    int number_entries, uint16_t *list,
11795    uint32_t seq)
11796{
11797	uint16_t len, old_len, i;
11798	struct sctp_stream_reset_in_request *req_in;
11799	struct sctp_chunkhdr *ch;
11800
11801	ch = mtod(chk->data, struct sctp_chunkhdr *);
11802	old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11803
11804	/* get to new offset for the param. */
11805	req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
11806	/* now how long will this param be? */
11807	len = (uint16_t)(sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
11808	req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
11809	req_in->ph.param_length = htons(len);
11810	req_in->request_seq = htonl(seq);
11811	if (number_entries) {
11812		for (i = 0; i < number_entries; i++) {
11813			req_in->list_of_streams[i] = htons(list[i]);
11814		}
11815	}
11816	if (SCTP_SIZE32(len) > len) {
11817		/*-
11818		 * Need to worry about the pad we may end up adding to the
11819		 * end. This is easy since the struct is either aligned to 4
11820		 * bytes or 2 bytes off.
11821		 */
11822		req_in->list_of_streams[number_entries] = 0;
11823	}
11824	/* now fix the chunk length */
11825	ch->chunk_length = htons(len + old_len);
11826	chk->book_size = len + old_len;
11827	chk->book_size_scale = 0;
11828	chk->send_size = SCTP_SIZE32(chk->book_size);
11829	SCTP_BUF_LEN(chk->data) = chk->send_size;
11830	return;
11831}
11832
11833static void
11834sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
11835    uint32_t seq)
11836{
11837	uint16_t len, old_len;
11838	struct sctp_stream_reset_tsn_request *req_tsn;
11839	struct sctp_chunkhdr *ch;
11840
11841	ch = mtod(chk->data, struct sctp_chunkhdr *);
11842	old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11843
11844	/* get to new offset for the param. */
11845	req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
11846	/* now how long will this param be? */
11847	len = sizeof(struct sctp_stream_reset_tsn_request);
11848	req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
11849	req_tsn->ph.param_length = htons(len);
11850	req_tsn->request_seq = htonl(seq);
11851
11852	/* now fix the chunk length */
11853	ch->chunk_length = htons(len + old_len);
11854	chk->send_size = len + old_len;
11855	chk->book_size = SCTP_SIZE32(chk->send_size);
11856	chk->book_size_scale = 0;
11857	SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11858	return;
11859}
11860
11861void
11862sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
11863    uint32_t resp_seq, uint32_t result)
11864{
11865	uint16_t len, old_len;
11866	struct sctp_stream_reset_response *resp;
11867	struct sctp_chunkhdr *ch;
11868
11869	ch = mtod(chk->data, struct sctp_chunkhdr *);
11870	old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11871
11872	/* get to new offset for the param. */
11873	resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11874	/* now how long will this param be? */
11875	len = sizeof(struct sctp_stream_reset_response);
11876	resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11877	resp->ph.param_length = htons(len);
11878	resp->response_seq = htonl(resp_seq);
11879	resp->result = ntohl(result);
11880
11881	/* now fix the chunk length */
11882	ch->chunk_length = htons(len + old_len);
11883	chk->book_size = len + old_len;
11884	chk->book_size_scale = 0;
11885	chk->send_size = SCTP_SIZE32(chk->book_size);
11886	SCTP_BUF_LEN(chk->data) = chk->send_size;
11887	return;
11888}
11889
11890void
11891sctp_send_deferred_reset_response(struct sctp_tcb *stcb,
11892    struct sctp_stream_reset_list *ent,
11893    int response)
11894{
11895	struct sctp_association *asoc;
11896	struct sctp_tmit_chunk *chk;
11897	struct sctp_chunkhdr *ch;
11898
11899	asoc = &stcb->asoc;
11900
11901	/*
11902	 * Reset our last reset action to the new one IP -> response
11903	 * (PERFORMED probably). This assures that if we fail to send, a
11904	 * retran from the peer will get the new response.
11905	 */
11906	asoc->last_reset_action[0] = response;
11907	if (asoc->stream_reset_outstanding) {
11908		return;
11909	}
11910	sctp_alloc_a_chunk(stcb, chk);
11911	if (chk == NULL) {
11912		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11913		return;
11914	}
11915	chk->copy_by_ref = 0;
11916	chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11917	chk->rec.chunk_id.can_take_data = 0;
11918	chk->flags = 0;
11919	chk->asoc = &stcb->asoc;
11920	chk->book_size = sizeof(struct sctp_chunkhdr);
11921	chk->send_size = SCTP_SIZE32(chk->book_size);
11922	chk->book_size_scale = 0;
11923	chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11924	if (chk->data == NULL) {
11925		sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
11926		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11927		return;
11928	}
11929	SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11930	/* setup chunk parameters */
11931	chk->sent = SCTP_DATAGRAM_UNSENT;
11932	chk->snd_count = 0;
11933	if (stcb->asoc.alternate) {
11934		chk->whoTo = stcb->asoc.alternate;
11935	} else {
11936		chk->whoTo = stcb->asoc.primary_destination;
11937	}
11938	ch = mtod(chk->data, struct sctp_chunkhdr *);
11939	ch->chunk_type = SCTP_STREAM_RESET;
11940	ch->chunk_flags = 0;
11941	ch->chunk_length = htons(chk->book_size);
11942	atomic_add_int(&chk->whoTo->ref_count, 1);
11943	SCTP_BUF_LEN(chk->data) = chk->send_size;
11944	sctp_add_stream_reset_result(chk, ent->seq, response);
11945	/* insert the chunk for sending */
11946	TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11947	    chk,
11948	    sctp_next);
11949	asoc->ctrl_queue_cnt++;
11950}
11951
11952void
11953sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11954    uint32_t resp_seq, uint32_t result,
11955    uint32_t send_una, uint32_t recv_next)
11956{
11957	uint16_t len, old_len;
11958	struct sctp_stream_reset_response_tsn *resp;
11959	struct sctp_chunkhdr *ch;
11960
11961	ch = mtod(chk->data, struct sctp_chunkhdr *);
11962	old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11963
11964	/* get to new offset for the param. */
11965	resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11966	/* now how long will this param be? */
11967	len = sizeof(struct sctp_stream_reset_response_tsn);
11968	resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11969	resp->ph.param_length = htons(len);
11970	resp->response_seq = htonl(resp_seq);
11971	resp->result = htonl(result);
11972	resp->senders_next_tsn = htonl(send_una);
11973	resp->receivers_next_tsn = htonl(recv_next);
11974
11975	/* now fix the chunk length */
11976	ch->chunk_length = htons(len + old_len);
11977	chk->book_size = len + old_len;
11978	chk->send_size = SCTP_SIZE32(chk->book_size);
11979	chk->book_size_scale = 0;
11980	SCTP_BUF_LEN(chk->data) = chk->send_size;
11981	return;
11982}
11983
11984static void
11985sctp_add_an_out_stream(struct sctp_tmit_chunk *chk,
11986    uint32_t seq,
11987    uint16_t adding)
11988{
11989	uint16_t len, old_len;
11990	struct sctp_chunkhdr *ch;
11991	struct sctp_stream_reset_add_strm *addstr;
11992
11993	ch = mtod(chk->data, struct sctp_chunkhdr *);
11994	old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11995
11996	/* get to new offset for the param. */
11997	addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11998	/* now how long will this param be? */
11999	len = sizeof(struct sctp_stream_reset_add_strm);
12000
12001	/* Fill it out. */
12002	addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_OUT_STREAMS);
12003	addstr->ph.param_length = htons(len);
12004	addstr->request_seq = htonl(seq);
12005	addstr->number_of_streams = htons(adding);
12006	addstr->reserved = 0;
12007
12008	/* now fix the chunk length */
12009	ch->chunk_length = htons(len + old_len);
12010	chk->send_size = len + old_len;
12011	chk->book_size = SCTP_SIZE32(chk->send_size);
12012	chk->book_size_scale = 0;
12013	SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
12014	return;
12015}
12016
12017static void
12018sctp_add_an_in_stream(struct sctp_tmit_chunk *chk,
12019    uint32_t seq,
12020    uint16_t adding)
12021{
12022	uint16_t len, old_len;
12023	struct sctp_chunkhdr *ch;
12024	struct sctp_stream_reset_add_strm *addstr;
12025
12026	ch = mtod(chk->data, struct sctp_chunkhdr *);
12027	old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
12028
12029	/* get to new offset for the param. */
12030	addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
12031	/* now how long will this param be? */
12032	len = sizeof(struct sctp_stream_reset_add_strm);
12033	/* Fill it out. */
12034	addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_IN_STREAMS);
12035	addstr->ph.param_length = htons(len);
12036	addstr->request_seq = htonl(seq);
12037	addstr->number_of_streams = htons(adding);
12038	addstr->reserved = 0;
12039
12040	/* now fix the chunk length */
12041	ch->chunk_length = htons(len + old_len);
12042	chk->send_size = len + old_len;
12043	chk->book_size = SCTP_SIZE32(chk->send_size);
12044	chk->book_size_scale = 0;
12045	SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
12046	return;
12047}
12048
12049int
12050sctp_send_stream_reset_out_if_possible(struct sctp_tcb *stcb, int so_locked)
12051{
12052	struct sctp_association *asoc;
12053	struct sctp_tmit_chunk *chk;
12054	struct sctp_chunkhdr *ch;
12055	uint32_t seq;
12056
12057	asoc = &stcb->asoc;
12058	asoc->trigger_reset = 0;
12059	if (asoc->stream_reset_outstanding) {
12060		return (EALREADY);
12061	}
12062	sctp_alloc_a_chunk(stcb, chk);
12063	if (chk == NULL) {
12064		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12065		return (ENOMEM);
12066	}
12067	chk->copy_by_ref = 0;
12068	chk->rec.chunk_id.id = SCTP_STREAM_RESET;
12069	chk->rec.chunk_id.can_take_data = 0;
12070	chk->flags = 0;
12071	chk->asoc = &stcb->asoc;
12072	chk->book_size = sizeof(struct sctp_chunkhdr);
12073	chk->send_size = SCTP_SIZE32(chk->book_size);
12074	chk->book_size_scale = 0;
12075	chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
12076	if (chk->data == NULL) {
12077		sctp_free_a_chunk(stcb, chk, so_locked);
12078		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12079		return (ENOMEM);
12080	}
12081	SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
12082
12083	/* setup chunk parameters */
12084	chk->sent = SCTP_DATAGRAM_UNSENT;
12085	chk->snd_count = 0;
12086	if (stcb->asoc.alternate) {
12087		chk->whoTo = stcb->asoc.alternate;
12088	} else {
12089		chk->whoTo = stcb->asoc.primary_destination;
12090	}
12091	ch = mtod(chk->data, struct sctp_chunkhdr *);
12092	ch->chunk_type = SCTP_STREAM_RESET;
12093	ch->chunk_flags = 0;
12094	ch->chunk_length = htons(chk->book_size);
12095	atomic_add_int(&chk->whoTo->ref_count, 1);
12096	SCTP_BUF_LEN(chk->data) = chk->send_size;
12097	seq = stcb->asoc.str_reset_seq_out;
12098	if (sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1))) {
12099		seq++;
12100		asoc->stream_reset_outstanding++;
12101	} else {
12102		m_freem(chk->data);
12103		chk->data = NULL;
12104		sctp_free_a_chunk(stcb, chk, so_locked);
12105		return (ENOENT);
12106	}
12107	asoc->str_reset = chk;
12108	/* insert the chunk for sending */
12109	TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12110	    chk,
12111	    sctp_next);
12112	asoc->ctrl_queue_cnt++;
12113
12114	if (stcb->asoc.send_sack) {
12115		sctp_send_sack(stcb, so_locked);
12116	}
12117	sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12118	return (0);
12119}
12120
12121int
12122sctp_send_str_reset_req(struct sctp_tcb *stcb,
12123    uint16_t number_entries, uint16_t *list,
12124    uint8_t send_in_req,
12125    uint8_t send_tsn_req,
12126    uint8_t add_stream,
12127    uint16_t adding_o,
12128    uint16_t adding_i, uint8_t peer_asked)
12129{
12130	struct sctp_association *asoc;
12131	struct sctp_tmit_chunk *chk;
12132	struct sctp_chunkhdr *ch;
12133	int can_send_out_req = 0;
12134	uint32_t seq;
12135
12136	asoc = &stcb->asoc;
12137	if (asoc->stream_reset_outstanding) {
12138		/*-
12139		 * Already one pending, must get ACK back to clear the flag.
12140		 */
12141		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
12142		return (EBUSY);
12143	}
12144	if ((send_in_req == 0) && (send_tsn_req == 0) &&
12145	    (add_stream == 0)) {
12146		/* nothing to do */
12147		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12148		return (EINVAL);
12149	}
12150	if (send_tsn_req && send_in_req) {
12151		/* error, can't do that */
12152		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12153		return (EINVAL);
12154	} else if (send_in_req) {
12155		can_send_out_req = 1;
12156	}
12157	if (number_entries > (MCLBYTES -
12158	    SCTP_MIN_OVERHEAD -
12159	    sizeof(struct sctp_chunkhdr) -
12160	    sizeof(struct sctp_stream_reset_out_request)) /
12161	    sizeof(uint16_t)) {
12162		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12163		return (ENOMEM);
12164	}
12165	sctp_alloc_a_chunk(stcb, chk);
12166	if (chk == NULL) {
12167		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12168		return (ENOMEM);
12169	}
12170	chk->copy_by_ref = 0;
12171	chk->rec.chunk_id.id = SCTP_STREAM_RESET;
12172	chk->rec.chunk_id.can_take_data = 0;
12173	chk->flags = 0;
12174	chk->asoc = &stcb->asoc;
12175	chk->book_size = sizeof(struct sctp_chunkhdr);
12176	chk->send_size = SCTP_SIZE32(chk->book_size);
12177	chk->book_size_scale = 0;
12178
12179	chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
12180	if (chk->data == NULL) {
12181		sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
12182		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12183		return (ENOMEM);
12184	}
12185	SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
12186
12187	/* setup chunk parameters */
12188	chk->sent = SCTP_DATAGRAM_UNSENT;
12189	chk->snd_count = 0;
12190	if (stcb->asoc.alternate) {
12191		chk->whoTo = stcb->asoc.alternate;
12192	} else {
12193		chk->whoTo = stcb->asoc.primary_destination;
12194	}
12195	atomic_add_int(&chk->whoTo->ref_count, 1);
12196	ch = mtod(chk->data, struct sctp_chunkhdr *);
12197	ch->chunk_type = SCTP_STREAM_RESET;
12198	ch->chunk_flags = 0;
12199	ch->chunk_length = htons(chk->book_size);
12200	SCTP_BUF_LEN(chk->data) = chk->send_size;
12201
12202	seq = stcb->asoc.str_reset_seq_out;
12203	if (can_send_out_req) {
12204		int ret;
12205
12206		ret = sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1));
12207		if (ret) {
12208			seq++;
12209			asoc->stream_reset_outstanding++;
12210		}
12211	}
12212	if ((add_stream & 1) &&
12213	    ((stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt) < adding_o)) {
12214		/* Need to allocate more */
12215		struct sctp_stream_out *oldstream;
12216		struct sctp_stream_queue_pending *sp, *nsp;
12217		int i;
12218#if defined(SCTP_DETAILED_STR_STATS)
12219		int j;
12220#endif
12221
12222		oldstream = stcb->asoc.strmout;
12223		/* get some more */
12224		SCTP_MALLOC(stcb->asoc.strmout, struct sctp_stream_out *,
12225		    (stcb->asoc.streamoutcnt + adding_o) * sizeof(struct sctp_stream_out),
12226		    SCTP_M_STRMO);
12227		if (stcb->asoc.strmout == NULL) {
12228			uint8_t x;
12229
12230			stcb->asoc.strmout = oldstream;
12231			/* Turn off the bit */
12232			x = add_stream & 0xfe;
12233			add_stream = x;
12234			goto skip_stuff;
12235		}
12236		/*
12237		 * Ok now we proceed with copying the old out stuff and
12238		 * initializing the new stuff.
12239		 */
12240		SCTP_TCB_SEND_LOCK(stcb);
12241		stcb->asoc.ss_functions.sctp_ss_clear(stcb, &stcb->asoc, 0, 1);
12242		for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
12243			TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12244			stcb->asoc.strmout[i].chunks_on_queues = oldstream[i].chunks_on_queues;
12245			stcb->asoc.strmout[i].next_mid_ordered = oldstream[i].next_mid_ordered;
12246			stcb->asoc.strmout[i].next_mid_unordered = oldstream[i].next_mid_unordered;
12247			stcb->asoc.strmout[i].last_msg_incomplete = oldstream[i].last_msg_incomplete;
12248			stcb->asoc.strmout[i].sid = i;
12249			stcb->asoc.strmout[i].state = oldstream[i].state;
12250			/* FIX ME FIX ME */
12251			/*
12252			 * This should be a SS_COPY operation FIX ME STREAM
12253			 * SCHEDULER EXPERT
12254			 */
12255			stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], &oldstream[i]);
12256			/* now anything on those queues? */
12257			TAILQ_FOREACH_SAFE(sp, &oldstream[i].outqueue, next, nsp) {
12258				TAILQ_REMOVE(&oldstream[i].outqueue, sp, next);
12259				TAILQ_INSERT_TAIL(&stcb->asoc.strmout[i].outqueue, sp, next);
12260			}
12261
12262		}
12263		/* now the new streams */
12264		stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 1);
12265		for (i = stcb->asoc.streamoutcnt; i < (stcb->asoc.streamoutcnt + adding_o); i++) {
12266			TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12267			stcb->asoc.strmout[i].chunks_on_queues = 0;
12268#if defined(SCTP_DETAILED_STR_STATS)
12269			for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
12270				stcb->asoc.strmout[i].abandoned_sent[j] = 0;
12271				stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
12272			}
12273#else
12274			stcb->asoc.strmout[i].abandoned_sent[0] = 0;
12275			stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
12276#endif
12277			stcb->asoc.strmout[i].next_mid_ordered = 0;
12278			stcb->asoc.strmout[i].next_mid_unordered = 0;
12279			stcb->asoc.strmout[i].sid = i;
12280			stcb->asoc.strmout[i].last_msg_incomplete = 0;
12281			stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], NULL);
12282			stcb->asoc.strmout[i].state = SCTP_STREAM_CLOSED;
12283		}
12284		stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt + adding_o;
12285		SCTP_FREE(oldstream, SCTP_M_STRMO);
12286		SCTP_TCB_SEND_UNLOCK(stcb);
12287	}
12288skip_stuff:
12289	if ((add_stream & 1) && (adding_o > 0)) {
12290		asoc->strm_pending_add_size = adding_o;
12291		asoc->peer_req_out = peer_asked;
12292		sctp_add_an_out_stream(chk, seq, adding_o);
12293		seq++;
12294		asoc->stream_reset_outstanding++;
12295	}
12296	if ((add_stream & 2) && (adding_i > 0)) {
12297		sctp_add_an_in_stream(chk, seq, adding_i);
12298		seq++;
12299		asoc->stream_reset_outstanding++;
12300	}
12301	if (send_in_req) {
12302		sctp_add_stream_reset_in(chk, number_entries, list, seq);
12303		seq++;
12304		asoc->stream_reset_outstanding++;
12305	}
12306	if (send_tsn_req) {
12307		sctp_add_stream_reset_tsn(chk, seq);
12308		asoc->stream_reset_outstanding++;
12309	}
12310	asoc->str_reset = chk;
12311	/* insert the chunk for sending */
12312	TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12313	    chk,
12314	    sctp_next);
12315	asoc->ctrl_queue_cnt++;
12316	if (stcb->asoc.send_sack) {
12317		sctp_send_sack(stcb, SCTP_SO_LOCKED);
12318	}
12319	sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12320	return (0);
12321}
12322
12323void
12324sctp_send_abort(struct mbuf *m, int iphlen, struct sockaddr *src, struct sockaddr *dst,
12325    struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12326    uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12327    uint32_t vrf_id, uint16_t port)
12328{
12329	/* Don't respond to an ABORT with an ABORT. */
12330	if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
12331		if (cause)
12332			sctp_m_freem(cause);
12333		return;
12334	}
12335	sctp_send_resp_msg(src, dst, sh, vtag, SCTP_ABORT_ASSOCIATION, cause,
12336	    mflowtype, mflowid, fibnum,
12337	    vrf_id, port);
12338	return;
12339}
12340
12341void
12342sctp_send_operr_to(struct sockaddr *src, struct sockaddr *dst,
12343    struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12344    uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12345    uint32_t vrf_id, uint16_t port)
12346{
12347	sctp_send_resp_msg(src, dst, sh, vtag, SCTP_OPERATION_ERROR, cause,
12348	    mflowtype, mflowid, fibnum,
12349	    vrf_id, port);
12350	return;
12351}
12352
12353static struct mbuf *
12354sctp_copy_resume(struct uio *uio,
12355    int max_send_len,
12356    int user_marks_eor,
12357    int *error,
12358    uint32_t *sndout,
12359    struct mbuf **new_tail)
12360{
12361	struct mbuf *m;
12362
12363	m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
12364	    (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
12365	if (m == NULL) {
12366		SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12367		*error = ENOBUFS;
12368	} else {
12369		*sndout = m_length(m, NULL);
12370		*new_tail = m_last(m);
12371	}
12372	return (m);
12373}
12374
12375static int
12376sctp_copy_one(struct sctp_stream_queue_pending *sp,
12377    struct uio *uio,
12378    int resv_upfront)
12379{
12380	sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
12381	    resv_upfront, 0);
12382	if (sp->data == NULL) {
12383		SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12384		return (ENOBUFS);
12385	}
12386	sp->tail_mbuf = m_last(sp->data);
12387	return (0);
12388}
12389
12390
12391
12392static struct sctp_stream_queue_pending *
12393sctp_copy_it_in(struct sctp_tcb *stcb,
12394    struct sctp_association *asoc,
12395    struct sctp_sndrcvinfo *srcv,
12396    struct uio *uio,
12397    struct sctp_nets *net,
12398    int max_send_len,
12399    int user_marks_eor,
12400    int *error)
12401{
12402	/*-
12403	 * This routine must be very careful in its work. Protocol
12404	 * processing is up and running so care must be taken to spl...()
12405	 * when you need to do something that may effect the stcb/asoc. The
12406	 * sb is locked however. When data is copied the protocol processing
12407	 * should be enabled since this is a slower operation...
12408	 */
12409	struct sctp_stream_queue_pending *sp = NULL;
12410	int resv_in_first;
12411
12412	*error = 0;
12413	/* Now can we send this? */
12414	if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12415	    (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12416	    (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12417	    (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12418		/* got data while shutting down */
12419		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12420		*error = ECONNRESET;
12421		goto out_now;
12422	}
12423	sctp_alloc_a_strmoq(stcb, sp);
12424	if (sp == NULL) {
12425		SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12426		*error = ENOMEM;
12427		goto out_now;
12428	}
12429	sp->act_flags = 0;
12430	sp->sender_all_done = 0;
12431	sp->sinfo_flags = srcv->sinfo_flags;
12432	sp->timetolive = srcv->sinfo_timetolive;
12433	sp->ppid = srcv->sinfo_ppid;
12434	sp->context = srcv->sinfo_context;
12435	sp->fsn = 0;
12436	(void)SCTP_GETTIME_TIMEVAL(&sp->ts);
12437
12438	sp->sid = srcv->sinfo_stream;
12439	sp->length = (uint32_t)min(uio->uio_resid, max_send_len);
12440	if ((sp->length == (uint32_t)uio->uio_resid) &&
12441	    ((user_marks_eor == 0) ||
12442	    (srcv->sinfo_flags & SCTP_EOF) ||
12443	    (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12444		sp->msg_is_complete = 1;
12445	} else {
12446		sp->msg_is_complete = 0;
12447	}
12448	sp->sender_all_done = 0;
12449	sp->some_taken = 0;
12450	sp->put_last_out = 0;
12451	resv_in_first = sizeof(struct sctp_data_chunk);
12452	sp->data = sp->tail_mbuf = NULL;
12453	if (sp->length == 0) {
12454		*error = 0;
12455		goto skip_copy;
12456	}
12457	if (srcv->sinfo_keynumber_valid) {
12458		sp->auth_keyid = srcv->sinfo_keynumber;
12459	} else {
12460		sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
12461	}
12462	if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
12463		sctp_auth_key_acquire(stcb, sp->auth_keyid);
12464		sp->holds_key_ref = 1;
12465	}
12466	*error = sctp_copy_one(sp, uio, resv_in_first);
12467skip_copy:
12468	if (*error) {
12469		sctp_free_a_strmoq(stcb, sp, SCTP_SO_LOCKED);
12470		sp = NULL;
12471	} else {
12472		if (sp->sinfo_flags & SCTP_ADDR_OVER) {
12473			sp->net = net;
12474			atomic_add_int(&sp->net->ref_count, 1);
12475		} else {
12476			sp->net = NULL;
12477		}
12478		sctp_set_prsctp_policy(sp);
12479	}
12480out_now:
12481	return (sp);
12482}
12483
12484
12485int
12486sctp_sosend(struct socket *so,
12487    struct sockaddr *addr,
12488    struct uio *uio,
12489    struct mbuf *top,
12490    struct mbuf *control,
12491    int flags,
12492    struct thread *p
12493)
12494{
12495	int error, use_sndinfo = 0;
12496	struct sctp_sndrcvinfo sndrcvninfo;
12497	struct sockaddr *addr_to_use;
12498#if defined(INET) && defined(INET6)
12499	struct sockaddr_in sin;
12500#endif
12501
12502	if (control) {
12503		/* process cmsg snd/rcv info (maybe a assoc-id) */
12504		if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&sndrcvninfo, control,
12505		    sizeof(sndrcvninfo))) {
12506			/* got one */
12507			use_sndinfo = 1;
12508		}
12509	}
12510	addr_to_use = addr;
12511#if defined(INET) && defined(INET6)
12512	if ((addr) && (addr->sa_family == AF_INET6)) {
12513		struct sockaddr_in6 *sin6;
12514
12515		sin6 = (struct sockaddr_in6 *)addr;
12516		if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
12517			in6_sin6_2_sin(&sin, sin6);
12518			addr_to_use = (struct sockaddr *)&sin;
12519		}
12520	}
12521#endif
12522	error = sctp_lower_sosend(so, addr_to_use, uio, top,
12523	    control,
12524	    flags,
12525	    use_sndinfo ? &sndrcvninfo : NULL
12526	    ,p
12527	    );
12528	return (error);
12529}
12530
12531
12532int
12533sctp_lower_sosend(struct socket *so,
12534    struct sockaddr *addr,
12535    struct uio *uio,
12536    struct mbuf *i_pak,
12537    struct mbuf *control,
12538    int flags,
12539    struct sctp_sndrcvinfo *srcv
12540    ,
12541    struct thread *p
12542)
12543{
12544	unsigned int sndlen = 0, max_len;
12545	int error, len;
12546	struct mbuf *top = NULL;
12547	int queue_only = 0, queue_only_for_init = 0;
12548	int free_cnt_applied = 0;
12549	int un_sent;
12550	int now_filled = 0;
12551	unsigned int inqueue_bytes = 0;
12552	struct sctp_block_entry be;
12553	struct sctp_inpcb *inp;
12554	struct sctp_tcb *stcb = NULL;
12555	struct timeval now;
12556	struct sctp_nets *net;
12557	struct sctp_association *asoc;
12558	struct sctp_inpcb *t_inp;
12559	int user_marks_eor;
12560	int create_lock_applied = 0;
12561	int nagle_applies = 0;
12562	int some_on_control = 0;
12563	int got_all_of_the_send = 0;
12564	int hold_tcblock = 0;
12565	int non_blocking = 0;
12566	uint32_t local_add_more, local_soresv = 0;
12567	uint16_t port;
12568	uint16_t sinfo_flags;
12569	sctp_assoc_t sinfo_assoc_id;
12570
12571	error = 0;
12572	net = NULL;
12573	stcb = NULL;
12574	asoc = NULL;
12575
12576	t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
12577	if (inp == NULL) {
12578		SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12579		error = EINVAL;
12580		if (i_pak) {
12581			SCTP_RELEASE_PKT(i_pak);
12582		}
12583		return (error);
12584	}
12585	if ((uio == NULL) && (i_pak == NULL)) {
12586		SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12587		return (EINVAL);
12588	}
12589	user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
12590	atomic_add_int(&inp->total_sends, 1);
12591	if (uio) {
12592		if (uio->uio_resid < 0) {
12593			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12594			return (EINVAL);
12595		}
12596		sndlen = (unsigned int)uio->uio_resid;
12597	} else {
12598		top = SCTP_HEADER_TO_CHAIN(i_pak);
12599		sndlen = SCTP_HEADER_LEN(i_pak);
12600	}
12601	SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %d\n",
12602	    (void *)addr,
12603	    sndlen);
12604	if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
12605	    (inp->sctp_socket->so_qlimit)) {
12606		/* The listener can NOT send */
12607		SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12608		error = ENOTCONN;
12609		goto out_unlocked;
12610	}
12611	/**
12612	 * Pre-screen address, if one is given the sin-len
12613	 * must be set correctly!
12614	 */
12615	if (addr) {
12616		union sctp_sockstore *raddr = (union sctp_sockstore *)addr;
12617
12618		switch (raddr->sa.sa_family) {
12619#ifdef INET
12620		case AF_INET:
12621			if (raddr->sin.sin_len != sizeof(struct sockaddr_in)) {
12622				SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12623				error = EINVAL;
12624				goto out_unlocked;
12625			}
12626			port = raddr->sin.sin_port;
12627			break;
12628#endif
12629#ifdef INET6
12630		case AF_INET6:
12631			if (raddr->sin6.sin6_len != sizeof(struct sockaddr_in6)) {
12632				SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12633				error = EINVAL;
12634				goto out_unlocked;
12635			}
12636			port = raddr->sin6.sin6_port;
12637			break;
12638#endif
12639		default:
12640			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAFNOSUPPORT);
12641			error = EAFNOSUPPORT;
12642			goto out_unlocked;
12643		}
12644	} else
12645		port = 0;
12646
12647	if (srcv) {
12648		sinfo_flags = srcv->sinfo_flags;
12649		sinfo_assoc_id = srcv->sinfo_assoc_id;
12650		if (INVALID_SINFO_FLAG(sinfo_flags) ||
12651		    PR_SCTP_INVALID_POLICY(sinfo_flags)) {
12652			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12653			error = EINVAL;
12654			goto out_unlocked;
12655		}
12656		if (srcv->sinfo_flags)
12657			SCTP_STAT_INCR(sctps_sends_with_flags);
12658	} else {
12659		sinfo_flags = inp->def_send.sinfo_flags;
12660		sinfo_assoc_id = inp->def_send.sinfo_assoc_id;
12661	}
12662	if (sinfo_flags & SCTP_SENDALL) {
12663		/* its a sendall */
12664		error = sctp_sendall(inp, uio, top, srcv);
12665		top = NULL;
12666		goto out_unlocked;
12667	}
12668	if ((sinfo_flags & SCTP_ADDR_OVER) && (addr == NULL)) {
12669		SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12670		error = EINVAL;
12671		goto out_unlocked;
12672	}
12673	/* now we must find the assoc */
12674	if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12675	    (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12676		SCTP_INP_RLOCK(inp);
12677		stcb = LIST_FIRST(&inp->sctp_asoc_list);
12678		if (stcb) {
12679			SCTP_TCB_LOCK(stcb);
12680			hold_tcblock = 1;
12681		}
12682		SCTP_INP_RUNLOCK(inp);
12683	} else if (sinfo_assoc_id) {
12684		stcb = sctp_findassociation_ep_asocid(inp, sinfo_assoc_id, 1);
12685		if (stcb != NULL) {
12686			hold_tcblock = 1;
12687		}
12688	} else if (addr) {
12689		/*-
12690		 * Since we did not use findep we must
12691		 * increment it, and if we don't find a tcb
12692		 * decrement it.
12693		 */
12694		SCTP_INP_WLOCK(inp);
12695		SCTP_INP_INCR_REF(inp);
12696		SCTP_INP_WUNLOCK(inp);
12697		stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12698		if (stcb == NULL) {
12699			SCTP_INP_WLOCK(inp);
12700			SCTP_INP_DECR_REF(inp);
12701			SCTP_INP_WUNLOCK(inp);
12702		} else {
12703			hold_tcblock = 1;
12704		}
12705	}
12706	if ((stcb == NULL) && (addr)) {
12707		/* Possible implicit send? */
12708		SCTP_ASOC_CREATE_LOCK(inp);
12709		create_lock_applied = 1;
12710		if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12711		    (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12712			/* Should I really unlock ? */
12713			SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12714			error = EINVAL;
12715			goto out_unlocked;
12716
12717		}
12718		if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12719		    (addr->sa_family == AF_INET6)) {
12720			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12721			error = EINVAL;
12722			goto out_unlocked;
12723		}
12724		SCTP_INP_WLOCK(inp);
12725		SCTP_INP_INCR_REF(inp);
12726		SCTP_INP_WUNLOCK(inp);
12727		/* With the lock applied look again */
12728		stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12729		if ((stcb == NULL) && (control != NULL) && (port > 0)) {
12730			stcb = sctp_findassociation_cmsgs(&t_inp, port, control, &net, &error);
12731		}
12732		if (stcb == NULL) {
12733			SCTP_INP_WLOCK(inp);
12734			SCTP_INP_DECR_REF(inp);
12735			SCTP_INP_WUNLOCK(inp);
12736		} else {
12737			hold_tcblock = 1;
12738		}
12739		if (error) {
12740			goto out_unlocked;
12741		}
12742		if (t_inp != inp) {
12743			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12744			error = ENOTCONN;
12745			goto out_unlocked;
12746		}
12747	}
12748	if (stcb == NULL) {
12749		if (addr == NULL) {
12750			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12751			error = ENOENT;
12752			goto out_unlocked;
12753		} else {
12754			/* We must go ahead and start the INIT process */
12755			uint32_t vrf_id;
12756
12757			if ((sinfo_flags & SCTP_ABORT) ||
12758			    ((sinfo_flags & SCTP_EOF) && (sndlen == 0))) {
12759				/*-
12760				 * User asks to abort a non-existant assoc,
12761				 * or EOF a non-existant assoc with no data
12762				 */
12763				SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12764				error = ENOENT;
12765				goto out_unlocked;
12766			}
12767			/* get an asoc/stcb struct */
12768			vrf_id = inp->def_vrf_id;
12769#ifdef INVARIANTS
12770			if (create_lock_applied == 0) {
12771				panic("Error, should hold create lock and I don't?");
12772			}
12773#endif
12774			stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
12775			    inp->sctp_ep.pre_open_stream_count,
12776			    inp->sctp_ep.port,
12777			    p);
12778			if (stcb == NULL) {
12779				/* Error is setup for us in the call */
12780				goto out_unlocked;
12781			}
12782			if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
12783				stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
12784				/*
12785				 * Set the connected flag so we can queue
12786				 * data
12787				 */
12788				soisconnecting(so);
12789			}
12790			hold_tcblock = 1;
12791			if (create_lock_applied) {
12792				SCTP_ASOC_CREATE_UNLOCK(inp);
12793				create_lock_applied = 0;
12794			} else {
12795				SCTP_PRINTF("Huh-3? create lock should have been on??\n");
12796			}
12797			/*
12798			 * Turn on queue only flag to prevent data from
12799			 * being sent
12800			 */
12801			queue_only = 1;
12802			asoc = &stcb->asoc;
12803			SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12804			(void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
12805
12806			/* initialize authentication params for the assoc */
12807			sctp_initialize_auth_params(inp, stcb);
12808
12809			if (control) {
12810				if (sctp_process_cmsgs_for_init(stcb, control, &error)) {
12811					sctp_free_assoc(inp, stcb, SCTP_PCBFREE_FORCE,
12812					    SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
12813					hold_tcblock = 0;
12814					stcb = NULL;
12815					goto out_unlocked;
12816				}
12817			}
12818			/* out with the INIT */
12819			queue_only_for_init = 1;
12820			/*-
12821			 * we may want to dig in after this call and adjust the MTU
12822			 * value. It defaulted to 1500 (constant) but the ro
12823			 * structure may now have an update and thus we may need to
12824			 * change it BEFORE we append the message.
12825			 */
12826		}
12827	} else
12828		asoc = &stcb->asoc;
12829	if (srcv == NULL)
12830		srcv = (struct sctp_sndrcvinfo *)&asoc->def_send;
12831	if (srcv->sinfo_flags & SCTP_ADDR_OVER) {
12832		if (addr)
12833			net = sctp_findnet(stcb, addr);
12834		else
12835			net = NULL;
12836		if ((net == NULL) ||
12837		    ((port != 0) && (port != stcb->rport))) {
12838			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12839			error = EINVAL;
12840			goto out_unlocked;
12841		}
12842	} else {
12843		if (stcb->asoc.alternate) {
12844			net = stcb->asoc.alternate;
12845		} else {
12846			net = stcb->asoc.primary_destination;
12847		}
12848	}
12849	atomic_add_int(&stcb->total_sends, 1);
12850	/* Keep the stcb from being freed under our feet */
12851	atomic_add_int(&asoc->refcnt, 1);
12852	free_cnt_applied = 1;
12853
12854	if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12855		if (sndlen > asoc->smallest_mtu) {
12856			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12857			error = EMSGSIZE;
12858			goto out_unlocked;
12859		}
12860	}
12861	if (SCTP_SO_IS_NBIO(so)
12862	    || (flags & MSG_NBIO)
12863	    ) {
12864		non_blocking = 1;
12865	}
12866	/* would we block? */
12867	if (non_blocking) {
12868		if (hold_tcblock == 0) {
12869			SCTP_TCB_LOCK(stcb);
12870			hold_tcblock = 1;
12871		}
12872		inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12873		if ((SCTP_SB_LIMIT_SND(so) < (sndlen + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
12874		    (stcb->asoc.chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12875			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
12876			if (sndlen > SCTP_SB_LIMIT_SND(so))
12877				error = EMSGSIZE;
12878			else
12879				error = EWOULDBLOCK;
12880			goto out_unlocked;
12881		}
12882		stcb->asoc.sb_send_resv += sndlen;
12883		SCTP_TCB_UNLOCK(stcb);
12884		hold_tcblock = 0;
12885	} else {
12886		atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
12887	}
12888	local_soresv = sndlen;
12889	if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12890		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12891		error = ECONNRESET;
12892		goto out_unlocked;
12893	}
12894	if (create_lock_applied) {
12895		SCTP_ASOC_CREATE_UNLOCK(inp);
12896		create_lock_applied = 0;
12897	}
12898	/* Is the stream no. valid? */
12899	if (srcv->sinfo_stream >= asoc->streamoutcnt) {
12900		/* Invalid stream number */
12901		SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12902		error = EINVAL;
12903		goto out_unlocked;
12904	}
12905	if ((asoc->strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPEN) &&
12906	    (asoc->strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPENING)) {
12907		/*
12908		 * Can't queue any data while stream reset is underway.
12909		 */
12910		if (asoc->strmout[srcv->sinfo_stream].state > SCTP_STREAM_OPEN) {
12911			error = EAGAIN;
12912		} else {
12913			error = EINVAL;
12914		}
12915		SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, error);
12916		goto out_unlocked;
12917	}
12918	if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12919	    (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12920		queue_only = 1;
12921	}
12922	/* we are now done with all control */
12923	if (control) {
12924		sctp_m_freem(control);
12925		control = NULL;
12926	}
12927	if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12928	    (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12929	    (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12930	    (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12931		if (srcv->sinfo_flags & SCTP_ABORT) {
12932			;
12933		} else {
12934			SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12935			error = ECONNRESET;
12936			goto out_unlocked;
12937		}
12938	}
12939	/* Ok, we will attempt a msgsnd :> */
12940	if (p) {
12941		p->td_ru.ru_msgsnd++;
12942	}
12943	/* Are we aborting? */
12944	if (srcv->sinfo_flags & SCTP_ABORT) {
12945		struct mbuf *mm;
12946		int tot_demand, tot_out = 0, max_out;
12947
12948		SCTP_STAT_INCR(sctps_sends_with_abort);
12949		if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12950		    (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12951			/* It has to be up before we abort */
12952			/* how big is the user initiated abort? */
12953			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12954			error = EINVAL;
12955			goto out;
12956		}
12957		if (hold_tcblock) {
12958			SCTP_TCB_UNLOCK(stcb);
12959			hold_tcblock = 0;
12960		}
12961		if (top) {
12962			struct mbuf *cntm = NULL;
12963
12964			mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_WAITOK, 1, MT_DATA);
12965			if (sndlen != 0) {
12966				for (cntm = top; cntm; cntm = SCTP_BUF_NEXT(cntm)) {
12967					tot_out += SCTP_BUF_LEN(cntm);
12968				}
12969			}
12970		} else {
12971			/* Must fit in a MTU */
12972			tot_out = sndlen;
12973			tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12974			if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
12975				/* To big */
12976				SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12977				error = EMSGSIZE;
12978				goto out;
12979			}
12980			mm = sctp_get_mbuf_for_msg(tot_demand, 0, M_WAITOK, 1, MT_DATA);
12981		}
12982		if (mm == NULL) {
12983			SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12984			error = ENOMEM;
12985			goto out;
12986		}
12987		max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
12988		max_out -= sizeof(struct sctp_abort_msg);
12989		if (tot_out > max_out) {
12990			tot_out = max_out;
12991		}
12992		if (mm) {
12993			struct sctp_paramhdr *ph;
12994
12995			/* now move forward the data pointer */
12996			ph = mtod(mm, struct sctp_paramhdr *);
12997			ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
12998			ph->param_length = htons((uint16_t)(sizeof(struct sctp_paramhdr) + tot_out));
12999			ph++;
13000			SCTP_BUF_LEN(mm) = tot_out + sizeof(struct sctp_paramhdr);
13001			if (top == NULL) {
13002				error = uiomove((caddr_t)ph, (int)tot_out, uio);
13003				if (error) {
13004					/*-
13005					 * Here if we can't get his data we
13006					 * still abort we just don't get to
13007					 * send the users note :-0
13008					 */
13009					sctp_m_freem(mm);
13010					mm = NULL;
13011				}
13012			} else {
13013				if (sndlen != 0) {
13014					SCTP_BUF_NEXT(mm) = top;
13015				}
13016			}
13017		}
13018		if (hold_tcblock == 0) {
13019			SCTP_TCB_LOCK(stcb);
13020		}
13021		atomic_add_int(&stcb->asoc.refcnt, -1);
13022		free_cnt_applied = 0;
13023		/* release this lock, otherwise we hang on ourselves */
13024		sctp_abort_an_association(stcb->sctp_ep, stcb, mm, SCTP_SO_LOCKED);
13025		/* now relock the stcb so everything is sane */
13026		hold_tcblock = 0;
13027		stcb = NULL;
13028		/*
13029		 * In this case top is already chained to mm avoid double
13030		 * free, since we free it below if top != NULL and driver
13031		 * would free it after sending the packet out
13032		 */
13033		if (sndlen != 0) {
13034			top = NULL;
13035		}
13036		goto out_unlocked;
13037	}
13038	/* Calculate the maximum we can send */
13039	inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13040	if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13041		if (non_blocking) {
13042			/* we already checked for non-blocking above. */
13043			max_len = sndlen;
13044		} else {
13045			max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13046		}
13047	} else {
13048		max_len = 0;
13049	}
13050	if (hold_tcblock) {
13051		SCTP_TCB_UNLOCK(stcb);
13052		hold_tcblock = 0;
13053	}
13054	if (asoc->strmout == NULL) {
13055		/* huh? software error */
13056		SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
13057		error = EFAULT;
13058		goto out_unlocked;
13059	}
13060	/* Unless E_EOR mode is on, we must make a send FIT in one call. */
13061	if ((user_marks_eor == 0) &&
13062	    (sndlen > SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
13063		/* It will NEVER fit */
13064		SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
13065		error = EMSGSIZE;
13066		goto out_unlocked;
13067	}
13068	if ((uio == NULL) && user_marks_eor) {
13069		/*-
13070		 * We do not support eeor mode for
13071		 * sending with mbuf chains (like sendfile).
13072		 */
13073		SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13074		error = EINVAL;
13075		goto out_unlocked;
13076	}
13077	if (user_marks_eor) {
13078		local_add_more = min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
13079	} else {
13080		/*-
13081		 * For non-eeor the whole message must fit in
13082		 * the socket send buffer.
13083		 */
13084		local_add_more = sndlen;
13085	}
13086	len = 0;
13087	if (non_blocking) {
13088		goto skip_preblock;
13089	}
13090	if (((max_len <= local_add_more) &&
13091	    (SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
13092	    (max_len == 0) ||
13093	    ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13094		/* No room right now ! */
13095		SOCKBUF_LOCK(&so->so_snd);
13096		inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13097		while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
13098		    ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13099			SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %d) || (%d+%d > %d)\n",
13100			    (unsigned int)SCTP_SB_LIMIT_SND(so),
13101			    inqueue_bytes,
13102			    local_add_more,
13103			    stcb->asoc.stream_queue_cnt,
13104			    stcb->asoc.chunks_on_out_queue,
13105			    SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
13106			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13107				sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, asoc, sndlen);
13108			}
13109			be.error = 0;
13110			stcb->block_entry = &be;
13111			error = sbwait(&so->so_snd);
13112			stcb->block_entry = NULL;
13113			if (error || so->so_error || be.error) {
13114				if (error == 0) {
13115					if (so->so_error)
13116						error = so->so_error;
13117					if (be.error) {
13118						error = be.error;
13119					}
13120				}
13121				SOCKBUF_UNLOCK(&so->so_snd);
13122				goto out_unlocked;
13123			}
13124			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13125				sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13126				    asoc, stcb->asoc.total_output_queue_size);
13127			}
13128			if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13129				SOCKBUF_UNLOCK(&so->so_snd);
13130				goto out_unlocked;
13131			}
13132			inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13133		}
13134		if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13135			max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13136		} else {
13137			max_len = 0;
13138		}
13139		SOCKBUF_UNLOCK(&so->so_snd);
13140	}
13141skip_preblock:
13142	if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13143		goto out_unlocked;
13144	}
13145	/*
13146	 * sndlen covers for mbuf case uio_resid covers for the non-mbuf
13147	 * case NOTE: uio will be null when top/mbuf is passed
13148	 */
13149	if (sndlen == 0) {
13150		if (srcv->sinfo_flags & SCTP_EOF) {
13151			got_all_of_the_send = 1;
13152			goto dataless_eof;
13153		} else {
13154			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13155			error = EINVAL;
13156			goto out;
13157		}
13158	}
13159	if (top == NULL) {
13160		struct sctp_stream_queue_pending *sp;
13161		struct sctp_stream_out *strm;
13162		uint32_t sndout;
13163
13164		SCTP_TCB_SEND_LOCK(stcb);
13165		if ((asoc->stream_locked) &&
13166		    (asoc->stream_locked_on != srcv->sinfo_stream)) {
13167			SCTP_TCB_SEND_UNLOCK(stcb);
13168			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13169			error = EINVAL;
13170			goto out;
13171		}
13172		SCTP_TCB_SEND_UNLOCK(stcb);
13173
13174		strm = &stcb->asoc.strmout[srcv->sinfo_stream];
13175		if (strm->last_msg_incomplete == 0) {
13176	do_a_copy_in:
13177			sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error);
13178			if ((sp == NULL) || (error)) {
13179				goto out;
13180			}
13181			SCTP_TCB_SEND_LOCK(stcb);
13182			if (sp->msg_is_complete) {
13183				strm->last_msg_incomplete = 0;
13184				asoc->stream_locked = 0;
13185			} else {
13186				/*
13187				 * Just got locked to this guy in case of an
13188				 * interrupt.
13189				 */
13190				strm->last_msg_incomplete = 1;
13191				if (stcb->asoc.idata_supported == 0) {
13192					asoc->stream_locked = 1;
13193					asoc->stream_locked_on = srcv->sinfo_stream;
13194				}
13195				sp->sender_all_done = 0;
13196			}
13197			sctp_snd_sb_alloc(stcb, sp->length);
13198			atomic_add_int(&asoc->stream_queue_cnt, 1);
13199			if (srcv->sinfo_flags & SCTP_UNORDERED) {
13200				SCTP_STAT_INCR(sctps_sends_with_unord);
13201			}
13202			TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
13203			stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, asoc, strm, sp, 1);
13204			SCTP_TCB_SEND_UNLOCK(stcb);
13205		} else {
13206			SCTP_TCB_SEND_LOCK(stcb);
13207			sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
13208			SCTP_TCB_SEND_UNLOCK(stcb);
13209			if (sp == NULL) {
13210				/* ???? Huh ??? last msg is gone */
13211#ifdef INVARIANTS
13212				panic("Warning: Last msg marked incomplete, yet nothing left?");
13213#else
13214				SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
13215				strm->last_msg_incomplete = 0;
13216#endif
13217				goto do_a_copy_in;
13218
13219			}
13220		}
13221		while (uio->uio_resid > 0) {
13222			/* How much room do we have? */
13223			struct mbuf *new_tail, *mm;
13224
13225			if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
13226				max_len = SCTP_SB_LIMIT_SND(so) - stcb->asoc.total_output_queue_size;
13227			else
13228				max_len = 0;
13229
13230			if ((max_len > SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
13231			    (max_len && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
13232			    (uio->uio_resid && (uio->uio_resid <= (int)max_len))) {
13233				sndout = 0;
13234				new_tail = NULL;
13235				if (hold_tcblock) {
13236					SCTP_TCB_UNLOCK(stcb);
13237					hold_tcblock = 0;
13238				}
13239				mm = sctp_copy_resume(uio, max_len, user_marks_eor, &error, &sndout, &new_tail);
13240				if ((mm == NULL) || error) {
13241					if (mm) {
13242						sctp_m_freem(mm);
13243					}
13244					goto out;
13245				}
13246				/* Update the mbuf and count */
13247				SCTP_TCB_SEND_LOCK(stcb);
13248				if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13249					/*
13250					 * we need to get out. Peer probably
13251					 * aborted.
13252					 */
13253					sctp_m_freem(mm);
13254					if (stcb->asoc.state & SCTP_PCB_FLAGS_WAS_ABORTED) {
13255						SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
13256						error = ECONNRESET;
13257					}
13258					SCTP_TCB_SEND_UNLOCK(stcb);
13259					goto out;
13260				}
13261				if (sp->tail_mbuf) {
13262					/* tack it to the end */
13263					SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
13264					sp->tail_mbuf = new_tail;
13265				} else {
13266					/* A stolen mbuf */
13267					sp->data = mm;
13268					sp->tail_mbuf = new_tail;
13269				}
13270				sctp_snd_sb_alloc(stcb, sndout);
13271				atomic_add_int(&sp->length, sndout);
13272				len += sndout;
13273				if (srcv->sinfo_flags & SCTP_SACK_IMMEDIATELY) {
13274					sp->sinfo_flags |= SCTP_SACK_IMMEDIATELY;
13275				}
13276				/* Did we reach EOR? */
13277				if ((uio->uio_resid == 0) &&
13278				    ((user_marks_eor == 0) ||
13279				    (srcv->sinfo_flags & SCTP_EOF) ||
13280				    (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
13281					sp->msg_is_complete = 1;
13282				} else {
13283					sp->msg_is_complete = 0;
13284				}
13285				SCTP_TCB_SEND_UNLOCK(stcb);
13286			}
13287			if (uio->uio_resid == 0) {
13288				/* got it all? */
13289				continue;
13290			}
13291			/* PR-SCTP? */
13292			if ((asoc->prsctp_supported) && (asoc->sent_queue_cnt_removeable > 0)) {
13293				/*
13294				 * This is ugly but we must assure locking
13295				 * order
13296				 */
13297				if (hold_tcblock == 0) {
13298					SCTP_TCB_LOCK(stcb);
13299					hold_tcblock = 1;
13300				}
13301				sctp_prune_prsctp(stcb, asoc, srcv, sndlen);
13302				inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13303				if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
13304					max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13305				else
13306					max_len = 0;
13307				if (max_len > 0) {
13308					continue;
13309				}
13310				SCTP_TCB_UNLOCK(stcb);
13311				hold_tcblock = 0;
13312			}
13313			/* wait for space now */
13314			if (non_blocking) {
13315				/* Non-blocking io in place out */
13316				goto skip_out_eof;
13317			}
13318			/* What about the INIT, send it maybe */
13319			if (queue_only_for_init) {
13320				if (hold_tcblock == 0) {
13321					SCTP_TCB_LOCK(stcb);
13322					hold_tcblock = 1;
13323				}
13324				if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13325					/* a collision took us forward? */
13326					queue_only = 0;
13327				} else {
13328					sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13329					SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
13330					queue_only = 1;
13331				}
13332			}
13333			if ((net->flight_size > net->cwnd) &&
13334			    (asoc->sctp_cmt_on_off == 0)) {
13335				SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13336				queue_only = 1;
13337			} else if (asoc->ifp_had_enobuf) {
13338				SCTP_STAT_INCR(sctps_ifnomemqueued);
13339				if (net->flight_size > (2 * net->mtu)) {
13340					queue_only = 1;
13341				}
13342				asoc->ifp_had_enobuf = 0;
13343			}
13344			un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13345			    (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13346			if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13347			    (stcb->asoc.total_flight > 0) &&
13348			    (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13349			    (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13350
13351				/*-
13352				 * Ok, Nagle is set on and we have data outstanding.
13353				 * Don't send anything and let SACKs drive out the
13354				 * data unless we have a "full" segment to send.
13355				 */
13356				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13357					sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13358				}
13359				SCTP_STAT_INCR(sctps_naglequeued);
13360				nagle_applies = 1;
13361			} else {
13362				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13363					if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13364						sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13365				}
13366				SCTP_STAT_INCR(sctps_naglesent);
13367				nagle_applies = 0;
13368			}
13369			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13370
13371				sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13372				    nagle_applies, un_sent);
13373				sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13374				    stcb->asoc.total_flight,
13375				    stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13376			}
13377			if (queue_only_for_init)
13378				queue_only_for_init = 0;
13379			if ((queue_only == 0) && (nagle_applies == 0)) {
13380				/*-
13381				 * need to start chunk output
13382				 * before blocking.. note that if
13383				 * a lock is already applied, then
13384				 * the input via the net is happening
13385				 * and I don't need to start output :-D
13386				 */
13387				if (hold_tcblock == 0) {
13388					if (SCTP_TCB_TRYLOCK(stcb)) {
13389						hold_tcblock = 1;
13390						sctp_chunk_output(inp,
13391						    stcb,
13392						    SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13393					}
13394				} else {
13395					sctp_chunk_output(inp,
13396					    stcb,
13397					    SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13398				}
13399				if (hold_tcblock == 1) {
13400					SCTP_TCB_UNLOCK(stcb);
13401					hold_tcblock = 0;
13402				}
13403			}
13404			SOCKBUF_LOCK(&so->so_snd);
13405			/*-
13406			 * This is a bit strange, but I think it will
13407			 * work. The total_output_queue_size is locked and
13408			 * protected by the TCB_LOCK, which we just released.
13409			 * There is a race that can occur between releasing it
13410			 * above, and me getting the socket lock, where sacks
13411			 * come in but we have not put the SB_WAIT on the
13412			 * so_snd buffer to get the wakeup. After the LOCK
13413			 * is applied the sack_processing will also need to
13414			 * LOCK the so->so_snd to do the actual sowwakeup(). So
13415			 * once we have the socket buffer lock if we recheck the
13416			 * size we KNOW we will get to sleep safely with the
13417			 * wakeup flag in place.
13418			 */
13419			if (SCTP_SB_LIMIT_SND(so) <= (stcb->asoc.total_output_queue_size +
13420			    min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
13421				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13422					sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
13423					    asoc, (size_t)uio->uio_resid);
13424				}
13425				be.error = 0;
13426				stcb->block_entry = &be;
13427				error = sbwait(&so->so_snd);
13428				stcb->block_entry = NULL;
13429
13430				if (error || so->so_error || be.error) {
13431					if (error == 0) {
13432						if (so->so_error)
13433							error = so->so_error;
13434						if (be.error) {
13435							error = be.error;
13436						}
13437					}
13438					SOCKBUF_UNLOCK(&so->so_snd);
13439					goto out_unlocked;
13440				}
13441				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13442					sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13443					    asoc, stcb->asoc.total_output_queue_size);
13444				}
13445			}
13446			SOCKBUF_UNLOCK(&so->so_snd);
13447			if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13448				goto out_unlocked;
13449			}
13450		}
13451		SCTP_TCB_SEND_LOCK(stcb);
13452		if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13453			SCTP_TCB_SEND_UNLOCK(stcb);
13454			goto out_unlocked;
13455		}
13456		if (sp) {
13457			if (sp->msg_is_complete == 0) {
13458				strm->last_msg_incomplete = 1;
13459				if (stcb->asoc.idata_supported == 0) {
13460					asoc->stream_locked = 1;
13461					asoc->stream_locked_on = srcv->sinfo_stream;
13462				}
13463			} else {
13464				sp->sender_all_done = 1;
13465				strm->last_msg_incomplete = 0;
13466				asoc->stream_locked = 0;
13467			}
13468		} else {
13469			SCTP_PRINTF("Huh no sp TSNH?\n");
13470			strm->last_msg_incomplete = 0;
13471			asoc->stream_locked = 0;
13472		}
13473		SCTP_TCB_SEND_UNLOCK(stcb);
13474		if (uio->uio_resid == 0) {
13475			got_all_of_the_send = 1;
13476		}
13477	} else {
13478		/* We send in a 0, since we do NOT have any locks */
13479		error = sctp_msg_append(stcb, net, top, srcv, 0);
13480		top = NULL;
13481		if (srcv->sinfo_flags & SCTP_EOF) {
13482			/*
13483			 * This should only happen for Panda for the mbuf
13484			 * send case, which does NOT yet support EEOR mode.
13485			 * Thus, we can just set this flag to do the proper
13486			 * EOF handling.
13487			 */
13488			got_all_of_the_send = 1;
13489		}
13490	}
13491	if (error) {
13492		goto out;
13493	}
13494dataless_eof:
13495	/* EOF thing ? */
13496	if ((srcv->sinfo_flags & SCTP_EOF) &&
13497	    (got_all_of_the_send == 1)) {
13498		SCTP_STAT_INCR(sctps_sends_with_eof);
13499		error = 0;
13500		if (hold_tcblock == 0) {
13501			SCTP_TCB_LOCK(stcb);
13502			hold_tcblock = 1;
13503		}
13504		if (TAILQ_EMPTY(&asoc->send_queue) &&
13505		    TAILQ_EMPTY(&asoc->sent_queue) &&
13506		    sctp_is_there_unsent_data(stcb, SCTP_SO_LOCKED) == 0) {
13507			if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
13508				goto abort_anyway;
13509			}
13510			/* there is nothing queued to send, so I'm done... */
13511			if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13512			    (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13513			    (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13514				struct sctp_nets *netp;
13515
13516				/* only send SHUTDOWN the first time through */
13517				if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
13518					SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13519				}
13520				SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
13521				SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
13522				sctp_stop_timers_for_shutdown(stcb);
13523				if (stcb->asoc.alternate) {
13524					netp = stcb->asoc.alternate;
13525				} else {
13526					netp = stcb->asoc.primary_destination;
13527				}
13528				sctp_send_shutdown(stcb, netp);
13529				sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13530				    netp);
13531				sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13532				    asoc->primary_destination);
13533			}
13534		} else {
13535			/*-
13536			 * we still got (or just got) data to send, so set
13537			 * SHUTDOWN_PENDING
13538			 */
13539			/*-
13540			 * XXX sockets draft says that SCTP_EOF should be
13541			 * sent with no data.  currently, we will allow user
13542			 * data to be sent first and move to
13543			 * SHUTDOWN-PENDING
13544			 */
13545			if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13546			    (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13547			    (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13548				if (hold_tcblock == 0) {
13549					SCTP_TCB_LOCK(stcb);
13550					hold_tcblock = 1;
13551				}
13552				if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
13553					asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
13554				}
13555				asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
13556				if (TAILQ_EMPTY(&asoc->send_queue) &&
13557				    TAILQ_EMPTY(&asoc->sent_queue) &&
13558				    (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13559					struct mbuf *op_err;
13560					char msg[SCTP_DIAG_INFO_LEN];
13561
13562			abort_anyway:
13563					if (free_cnt_applied) {
13564						atomic_add_int(&stcb->asoc.refcnt, -1);
13565						free_cnt_applied = 0;
13566					}
13567					snprintf(msg, sizeof(msg),
13568					    "%s:%d at %s", __FILE__, __LINE__, __func__);
13569					op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
13570					    msg);
13571					sctp_abort_an_association(stcb->sctp_ep, stcb,
13572					    op_err, SCTP_SO_LOCKED);
13573					/*
13574					 * now relock the stcb so everything
13575					 * is sane
13576					 */
13577					hold_tcblock = 0;
13578					stcb = NULL;
13579					goto out;
13580				}
13581				sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13582				    asoc->primary_destination);
13583				sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
13584			}
13585		}
13586	}
13587skip_out_eof:
13588	if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
13589		some_on_control = 1;
13590	}
13591	if (queue_only_for_init) {
13592		if (hold_tcblock == 0) {
13593			SCTP_TCB_LOCK(stcb);
13594			hold_tcblock = 1;
13595		}
13596		if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13597			/* a collision took us forward? */
13598			queue_only = 0;
13599		} else {
13600			sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13601			SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_WAIT);
13602			queue_only = 1;
13603		}
13604	}
13605	if ((net->flight_size > net->cwnd) &&
13606	    (stcb->asoc.sctp_cmt_on_off == 0)) {
13607		SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13608		queue_only = 1;
13609	} else if (asoc->ifp_had_enobuf) {
13610		SCTP_STAT_INCR(sctps_ifnomemqueued);
13611		if (net->flight_size > (2 * net->mtu)) {
13612			queue_only = 1;
13613		}
13614		asoc->ifp_had_enobuf = 0;
13615	}
13616	un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13617	    (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13618	if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13619	    (stcb->asoc.total_flight > 0) &&
13620	    (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13621	    (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13622		/*-
13623		 * Ok, Nagle is set on and we have data outstanding.
13624		 * Don't send anything and let SACKs drive out the
13625		 * data unless wen have a "full" segment to send.
13626		 */
13627		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13628			sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13629		}
13630		SCTP_STAT_INCR(sctps_naglequeued);
13631		nagle_applies = 1;
13632	} else {
13633		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13634			if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13635				sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13636		}
13637		SCTP_STAT_INCR(sctps_naglesent);
13638		nagle_applies = 0;
13639	}
13640	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13641		sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13642		    nagle_applies, un_sent);
13643		sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13644		    stcb->asoc.total_flight,
13645		    stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13646	}
13647	if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
13648		/* we can attempt to send too. */
13649		if (hold_tcblock == 0) {
13650			/*
13651			 * If there is activity recv'ing sacks no need to
13652			 * send
13653			 */
13654			if (SCTP_TCB_TRYLOCK(stcb)) {
13655				sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13656				hold_tcblock = 1;
13657			}
13658		} else {
13659			sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13660		}
13661	} else if ((queue_only == 0) &&
13662		    (stcb->asoc.peers_rwnd == 0) &&
13663	    (stcb->asoc.total_flight == 0)) {
13664		/* We get to have a probe outstanding */
13665		if (hold_tcblock == 0) {
13666			hold_tcblock = 1;
13667			SCTP_TCB_LOCK(stcb);
13668		}
13669		sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13670	} else if (some_on_control) {
13671		int num_out, reason, frag_point;
13672
13673		/* Here we do control only */
13674		if (hold_tcblock == 0) {
13675			hold_tcblock = 1;
13676			SCTP_TCB_LOCK(stcb);
13677		}
13678		frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
13679		(void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
13680		    &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
13681	}
13682	SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13683	    queue_only, stcb->asoc.peers_rwnd, un_sent,
13684	    stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
13685	    stcb->asoc.total_output_queue_size, error);
13686
13687out:
13688out_unlocked:
13689
13690	if (local_soresv && stcb) {
13691		atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
13692	}
13693	if (create_lock_applied) {
13694		SCTP_ASOC_CREATE_UNLOCK(inp);
13695	}
13696	if ((stcb) && hold_tcblock) {
13697		SCTP_TCB_UNLOCK(stcb);
13698	}
13699	if (stcb && free_cnt_applied) {
13700		atomic_add_int(&stcb->asoc.refcnt, -1);
13701	}
13702#ifdef INVARIANTS
13703	if (stcb) {
13704		if (mtx_owned(&stcb->tcb_mtx)) {
13705			panic("Leaving with tcb mtx owned?");
13706		}
13707		if (mtx_owned(&stcb->tcb_send_mtx)) {
13708			panic("Leaving with tcb send mtx owned?");
13709		}
13710	}
13711#endif
13712	if (top) {
13713		sctp_m_freem(top);
13714	}
13715	if (control) {
13716		sctp_m_freem(control);
13717	}
13718	return (error);
13719}
13720
13721
13722/*
13723 * generate an AUTHentication chunk, if required
13724 */
13725struct mbuf *
13726sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13727    struct sctp_auth_chunk **auth_ret, uint32_t *offset,
13728    struct sctp_tcb *stcb, uint8_t chunk)
13729{
13730	struct mbuf *m_auth;
13731	struct sctp_auth_chunk *auth;
13732	int chunk_len;
13733	struct mbuf *cn;
13734
13735	if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13736	    (stcb == NULL))
13737		return (m);
13738
13739	if (stcb->asoc.auth_supported == 0) {
13740		return (m);
13741	}
13742	/* does the requested chunk require auth? */
13743	if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13744		return (m);
13745	}
13746	m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_NOWAIT, 1, MT_HEADER);
13747	if (m_auth == NULL) {
13748		/* no mbuf's */
13749		return (m);
13750	}
13751	/* reserve some space if this will be the first mbuf */
13752	if (m == NULL)
13753		SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13754	/* fill in the AUTH chunk details */
13755	auth = mtod(m_auth, struct sctp_auth_chunk *);
13756	bzero(auth, sizeof(*auth));
13757	auth->ch.chunk_type = SCTP_AUTHENTICATION;
13758	auth->ch.chunk_flags = 0;
13759	chunk_len = sizeof(*auth) +
13760	    sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13761	auth->ch.chunk_length = htons(chunk_len);
13762	auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13763	/* key id and hmac digest will be computed and filled in upon send */
13764
13765	/* save the offset where the auth was inserted into the chain */
13766	*offset = 0;
13767	for (cn = m; cn; cn = SCTP_BUF_NEXT(cn)) {
13768		*offset += SCTP_BUF_LEN(cn);
13769	}
13770
13771	/* update length and return pointer to the auth chunk */
13772	SCTP_BUF_LEN(m_auth) = chunk_len;
13773	m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13774	if (auth_ret != NULL)
13775		*auth_ret = auth;
13776
13777	return (m);
13778}
13779
13780#ifdef INET6
13781int
13782sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t *ro)
13783{
13784	struct nd_prefix *pfx = NULL;
13785	struct nd_pfxrouter *pfxrtr = NULL;
13786	struct sockaddr_in6 gw6;
13787
13788	if (ro == NULL || ro->ro_rt == NULL || src6->sin6_family != AF_INET6)
13789		return (0);
13790
13791	/* get prefix entry of address */
13792	ND6_RLOCK();
13793	LIST_FOREACH(pfx, &MODULE_GLOBAL(nd_prefix), ndpr_entry) {
13794		if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13795			continue;
13796		if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13797		    &src6->sin6_addr, &pfx->ndpr_mask))
13798			break;
13799	}
13800	/* no prefix entry in the prefix list */
13801	if (pfx == NULL) {
13802		ND6_RUNLOCK();
13803		SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13804		SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13805		return (0);
13806	}
13807	SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13808	SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13809
13810	/* search installed gateway from prefix entry */
13811	LIST_FOREACH(pfxrtr, &pfx->ndpr_advrtrs, pfr_entry) {
13812		memset(&gw6, 0, sizeof(struct sockaddr_in6));
13813		gw6.sin6_family = AF_INET6;
13814		gw6.sin6_len = sizeof(struct sockaddr_in6);
13815		memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13816		    sizeof(struct in6_addr));
13817		SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13818		SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13819		SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13820		SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13821		if (sctp_cmpaddr((struct sockaddr *)&gw6, ro->ro_rt->rt_gateway)) {
13822			ND6_RUNLOCK();
13823			SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13824			ND6_RUNLOCK();
13825			return (1);
13826		}
13827	}
13828	ND6_RUNLOCK();
13829	SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13830	return (0);
13831}
13832#endif
13833
13834int
13835sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t *ro)
13836{
13837#ifdef INET
13838	struct sockaddr_in *sin, *mask;
13839	struct ifaddr *ifa;
13840	struct in_addr srcnetaddr, gwnetaddr;
13841
13842	if (ro == NULL || ro->ro_rt == NULL ||
13843	    sifa->address.sa.sa_family != AF_INET) {
13844		return (0);
13845	}
13846	ifa = (struct ifaddr *)sifa->ifa;
13847	mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13848	sin = &sifa->address.sin;
13849	srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13850	SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13851	SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13852	SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13853
13854	sin = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
13855	gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13856	SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13857	SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13858	SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13859	if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13860		return (1);
13861	}
13862#endif
13863	return (0);
13864}
13865