sctp_output.c revision 283822 
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/10/sys/netinet/sctp_output.c 283822 2015-05-31 12:46:40Z tuexen $");
35
36#include <netinet/sctp_os.h>
37#include <sys/proc.h>
38#include <netinet/sctp_var.h>
39#include <netinet/sctp_sysctl.h>
40#include <netinet/sctp_header.h>
41#include <netinet/sctp_pcb.h>
42#include <netinet/sctputil.h>
43#include <netinet/sctp_output.h>
44#include <netinet/sctp_uio.h>
45#include <netinet/sctputil.h>
46#include <netinet/sctp_auth.h>
47#include <netinet/sctp_timer.h>
48#include <netinet/sctp_asconf.h>
49#include <netinet/sctp_indata.h>
50#include <netinet/sctp_bsd_addr.h>
51#include <netinet/sctp_input.h>
52#include <netinet/sctp_crc32.h>
53#if defined(INET) || defined(INET6)
54#include <netinet/udp.h>
55#endif
56#include <netinet/udp_var.h>
57#include <machine/in_cksum.h>
58
59
60
61#define SCTP_MAX_GAPS_INARRAY 4
62struct sack_track {
63	uint8_t right_edge;	/* mergable on the right edge */
64	uint8_t left_edge;	/* mergable on the left edge */
65	uint8_t num_entries;
66	uint8_t spare;
67	struct sctp_gap_ack_block gaps[SCTP_MAX_GAPS_INARRAY];
68};
69
70struct 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 *parmh;
1944	struct mbuf *mret;
1945	uint16_t plen;
1946
1947#endif
1948
1949	switch (ifa->address.sa.sa_family) {
1950#ifdef INET
1951	case AF_INET:
1952		plen = (uint16_t) sizeof(struct sctp_ipv4addr_param);
1953		break;
1954#endif
1955#ifdef INET6
1956	case AF_INET6:
1957		plen = (uint16_t) sizeof(struct sctp_ipv6addr_param);
1958		break;
1959#endif
1960	default:
1961		return (m);
1962	}
1963#if defined(INET) || defined(INET6)
1964	if (M_TRAILINGSPACE(m) >= plen) {
1965		/* easy side we just drop it on the end */
1966		parmh = (struct sctp_paramhdr *)(SCTP_BUF_AT(m, SCTP_BUF_LEN(m)));
1967		mret = m;
1968	} else {
1969		/* Need more space */
1970		mret = m;
1971		while (SCTP_BUF_NEXT(mret) != NULL) {
1972			mret = SCTP_BUF_NEXT(mret);
1973		}
1974		SCTP_BUF_NEXT(mret) = sctp_get_mbuf_for_msg(plen, 0, M_NOWAIT, 1, MT_DATA);
1975		if (SCTP_BUF_NEXT(mret) == NULL) {
1976			/* We are hosed, can't add more addresses */
1977			return (m);
1978		}
1979		mret = SCTP_BUF_NEXT(mret);
1980		parmh = mtod(mret, struct sctp_paramhdr *);
1981	}
1982	/* now add the parameter */
1983	switch (ifa->address.sa.sa_family) {
1984#ifdef INET
1985	case AF_INET:
1986		{
1987			struct sctp_ipv4addr_param *ipv4p;
1988			struct sockaddr_in *sin;
1989
1990			sin = &ifa->address.sin;
1991			ipv4p = (struct sctp_ipv4addr_param *)parmh;
1992			parmh->param_type = htons(SCTP_IPV4_ADDRESS);
1993			parmh->param_length = htons(plen);
1994			ipv4p->addr = sin->sin_addr.s_addr;
1995			SCTP_BUF_LEN(mret) += plen;
1996			break;
1997		}
1998#endif
1999#ifdef INET6
2000	case AF_INET6:
2001		{
2002			struct sctp_ipv6addr_param *ipv6p;
2003			struct sockaddr_in6 *sin6;
2004
2005			sin6 = &ifa->address.sin6;
2006			ipv6p = (struct sctp_ipv6addr_param *)parmh;
2007			parmh->param_type = htons(SCTP_IPV6_ADDRESS);
2008			parmh->param_length = htons(plen);
2009			memcpy(ipv6p->addr, &sin6->sin6_addr,
2010			    sizeof(ipv6p->addr));
2011			/* clear embedded scope in the address */
2012			in6_clearscope((struct in6_addr *)ipv6p->addr);
2013			SCTP_BUF_LEN(mret) += plen;
2014			break;
2015		}
2016#endif
2017	default:
2018		return (m);
2019	}
2020	if (len != NULL) {
2021		*len += plen;
2022	}
2023	return (mret);
2024#endif
2025}
2026
2027
2028struct mbuf *
2029sctp_add_addresses_to_i_ia(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
2030    struct sctp_scoping *scope,
2031    struct mbuf *m_at, int cnt_inits_to,
2032    uint16_t * padding_len, uint16_t * chunk_len)
2033{
2034	struct sctp_vrf *vrf = NULL;
2035	int cnt, limit_out = 0, total_count;
2036	uint32_t vrf_id;
2037
2038	vrf_id = inp->def_vrf_id;
2039	SCTP_IPI_ADDR_RLOCK();
2040	vrf = sctp_find_vrf(vrf_id);
2041	if (vrf == NULL) {
2042		SCTP_IPI_ADDR_RUNLOCK();
2043		return (m_at);
2044	}
2045	if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
2046		struct sctp_ifa *sctp_ifap;
2047		struct sctp_ifn *sctp_ifnp;
2048
2049		cnt = cnt_inits_to;
2050		if (vrf->total_ifa_count > SCTP_COUNT_LIMIT) {
2051			limit_out = 1;
2052			cnt = SCTP_ADDRESS_LIMIT;
2053			goto skip_count;
2054		}
2055		LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2056			if ((scope->loopback_scope == 0) &&
2057			    SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2058				/*
2059				 * Skip loopback devices if loopback_scope
2060				 * not set
2061				 */
2062				continue;
2063			}
2064			LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2065#ifdef INET
2066				if ((sctp_ifap->address.sa.sa_family == AF_INET) &&
2067				    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2068				    &sctp_ifap->address.sin.sin_addr) != 0)) {
2069					continue;
2070				}
2071#endif
2072#ifdef INET6
2073				if ((sctp_ifap->address.sa.sa_family == AF_INET6) &&
2074				    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2075				    &sctp_ifap->address.sin6.sin6_addr) != 0)) {
2076					continue;
2077				}
2078#endif
2079				if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2080					continue;
2081				}
2082				if (sctp_is_address_in_scope(sctp_ifap, scope, 1) == 0) {
2083					continue;
2084				}
2085				cnt++;
2086				if (cnt > SCTP_ADDRESS_LIMIT) {
2087					break;
2088				}
2089			}
2090			if (cnt > SCTP_ADDRESS_LIMIT) {
2091				break;
2092			}
2093		}
2094skip_count:
2095		if (cnt > 1) {
2096			total_count = 0;
2097			LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2098				cnt = 0;
2099				if ((scope->loopback_scope == 0) &&
2100				    SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2101					/*
2102					 * Skip loopback devices if
2103					 * loopback_scope not set
2104					 */
2105					continue;
2106				}
2107				LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2108#ifdef INET
2109					if ((sctp_ifap->address.sa.sa_family == AF_INET) &&
2110					    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2111					    &sctp_ifap->address.sin.sin_addr) != 0)) {
2112						continue;
2113					}
2114#endif
2115#ifdef INET6
2116					if ((sctp_ifap->address.sa.sa_family == AF_INET6) &&
2117					    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2118					    &sctp_ifap->address.sin6.sin6_addr) != 0)) {
2119						continue;
2120					}
2121#endif
2122					if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2123						continue;
2124					}
2125					if (sctp_is_address_in_scope(sctp_ifap,
2126					    scope, 0) == 0) {
2127						continue;
2128					}
2129					if ((chunk_len != NULL) &&
2130					    (padding_len != NULL) &&
2131					    (*padding_len > 0)) {
2132						memset(mtod(m_at, caddr_t)+*chunk_len, 0, *padding_len);
2133						SCTP_BUF_LEN(m_at) += *padding_len;
2134						*chunk_len += *padding_len;
2135						*padding_len = 0;
2136					}
2137					m_at = sctp_add_addr_to_mbuf(m_at, sctp_ifap, chunk_len);
2138					if (limit_out) {
2139						cnt++;
2140						total_count++;
2141						if (cnt >= 2) {
2142							/*
2143							 * two from each
2144							 * address
2145							 */
2146							break;
2147						}
2148						if (total_count > SCTP_ADDRESS_LIMIT) {
2149							/* No more addresses */
2150							break;
2151						}
2152					}
2153				}
2154			}
2155		}
2156	} else {
2157		struct sctp_laddr *laddr;
2158
2159		cnt = cnt_inits_to;
2160		/* First, how many ? */
2161		LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2162			if (laddr->ifa == NULL) {
2163				continue;
2164			}
2165			if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED)
2166				/*
2167				 * Address being deleted by the system, dont
2168				 * list.
2169				 */
2170				continue;
2171			if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2172				/*
2173				 * Address being deleted on this ep don't
2174				 * list.
2175				 */
2176				continue;
2177			}
2178			if (sctp_is_address_in_scope(laddr->ifa,
2179			    scope, 1) == 0) {
2180				continue;
2181			}
2182			cnt++;
2183		}
2184		/*
2185		 * To get through a NAT we only list addresses if we have
2186		 * more than one. That way if you just bind a single address
2187		 * we let the source of the init dictate our address.
2188		 */
2189		if (cnt > 1) {
2190			cnt = cnt_inits_to;
2191			LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2192				if (laddr->ifa == NULL) {
2193					continue;
2194				}
2195				if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED) {
2196					continue;
2197				}
2198				if (sctp_is_address_in_scope(laddr->ifa,
2199				    scope, 0) == 0) {
2200					continue;
2201				}
2202				if ((chunk_len != NULL) &&
2203				    (padding_len != NULL) &&
2204				    (*padding_len > 0)) {
2205					memset(mtod(m_at, caddr_t)+*chunk_len, 0, *padding_len);
2206					SCTP_BUF_LEN(m_at) += *padding_len;
2207					*chunk_len += *padding_len;
2208					*padding_len = 0;
2209				}
2210				m_at = sctp_add_addr_to_mbuf(m_at, laddr->ifa, chunk_len);
2211				cnt++;
2212				if (cnt >= SCTP_ADDRESS_LIMIT) {
2213					break;
2214				}
2215			}
2216		}
2217	}
2218	SCTP_IPI_ADDR_RUNLOCK();
2219	return (m_at);
2220}
2221
2222static struct sctp_ifa *
2223sctp_is_ifa_addr_preferred(struct sctp_ifa *ifa,
2224    uint8_t dest_is_loop,
2225    uint8_t dest_is_priv,
2226    sa_family_t fam)
2227{
2228	uint8_t dest_is_global = 0;
2229
2230	/* dest_is_priv is true if destination is a private address */
2231	/* dest_is_loop is true if destination is a loopback addresses */
2232
2233	/**
2234	 * Here we determine if its a preferred address. A preferred address
2235	 * means it is the same scope or higher scope then the destination.
2236	 * L = loopback, P = private, G = global
2237	 * -----------------------------------------
2238	 *    src    |  dest | result
2239	 *  ----------------------------------------
2240	 *     L     |    L  |    yes
2241	 *  -----------------------------------------
2242	 *     P     |    L  |    yes-v4 no-v6
2243	 *  -----------------------------------------
2244	 *     G     |    L  |    yes-v4 no-v6
2245	 *  -----------------------------------------
2246	 *     L     |    P  |    no
2247	 *  -----------------------------------------
2248	 *     P     |    P  |    yes
2249	 *  -----------------------------------------
2250	 *     G     |    P  |    no
2251	 *   -----------------------------------------
2252	 *     L     |    G  |    no
2253	 *   -----------------------------------------
2254	 *     P     |    G  |    no
2255	 *    -----------------------------------------
2256	 *     G     |    G  |    yes
2257	 *    -----------------------------------------
2258	 */
2259
2260	if (ifa->address.sa.sa_family != fam) {
2261		/* forget mis-matched family */
2262		return (NULL);
2263	}
2264	if ((dest_is_priv == 0) && (dest_is_loop == 0)) {
2265		dest_is_global = 1;
2266	}
2267	SCTPDBG(SCTP_DEBUG_OUTPUT2, "Is destination preferred:");
2268	SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &ifa->address.sa);
2269	/* Ok the address may be ok */
2270#ifdef INET6
2271	if (fam == AF_INET6) {
2272		/* ok to use deprecated addresses? no lets not! */
2273		if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2274			SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:1\n");
2275			return (NULL);
2276		}
2277		if (ifa->src_is_priv && !ifa->src_is_loop) {
2278			if (dest_is_loop) {
2279				SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:2\n");
2280				return (NULL);
2281			}
2282		}
2283		if (ifa->src_is_glob) {
2284			if (dest_is_loop) {
2285				SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:3\n");
2286				return (NULL);
2287			}
2288		}
2289	}
2290#endif
2291	/*
2292	 * Now that we know what is what, implement or table this could in
2293	 * theory be done slicker (it used to be), but this is
2294	 * straightforward and easier to validate :-)
2295	 */
2296	SCTPDBG(SCTP_DEBUG_OUTPUT3, "src_loop:%d src_priv:%d src_glob:%d\n",
2297	    ifa->src_is_loop, ifa->src_is_priv, ifa->src_is_glob);
2298	SCTPDBG(SCTP_DEBUG_OUTPUT3, "dest_loop:%d dest_priv:%d dest_glob:%d\n",
2299	    dest_is_loop, dest_is_priv, dest_is_global);
2300
2301	if ((ifa->src_is_loop) && (dest_is_priv)) {
2302		SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:4\n");
2303		return (NULL);
2304	}
2305	if ((ifa->src_is_glob) && (dest_is_priv)) {
2306		SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:5\n");
2307		return (NULL);
2308	}
2309	if ((ifa->src_is_loop) && (dest_is_global)) {
2310		SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:6\n");
2311		return (NULL);
2312	}
2313	if ((ifa->src_is_priv) && (dest_is_global)) {
2314		SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:7\n");
2315		return (NULL);
2316	}
2317	SCTPDBG(SCTP_DEBUG_OUTPUT3, "YES\n");
2318	/* its a preferred address */
2319	return (ifa);
2320}
2321
2322static struct sctp_ifa *
2323sctp_is_ifa_addr_acceptable(struct sctp_ifa *ifa,
2324    uint8_t dest_is_loop,
2325    uint8_t dest_is_priv,
2326    sa_family_t fam)
2327{
2328	uint8_t dest_is_global = 0;
2329
2330	/**
2331	 * Here we determine if its a acceptable address. A acceptable
2332	 * address means it is the same scope or higher scope but we can
2333	 * allow for NAT which means its ok to have a global dest and a
2334	 * private src.
2335	 *
2336	 * L = loopback, P = private, G = global
2337	 * -----------------------------------------
2338	 *  src    |  dest | result
2339	 * -----------------------------------------
2340	 *   L     |   L   |    yes
2341	 *  -----------------------------------------
2342	 *   P     |   L   |    yes-v4 no-v6
2343	 *  -----------------------------------------
2344	 *   G     |   L   |    yes
2345	 * -----------------------------------------
2346	 *   L     |   P   |    no
2347	 * -----------------------------------------
2348	 *   P     |   P   |    yes
2349	 * -----------------------------------------
2350	 *   G     |   P   |    yes - May not work
2351	 * -----------------------------------------
2352	 *   L     |   G   |    no
2353	 * -----------------------------------------
2354	 *   P     |   G   |    yes - May not work
2355	 * -----------------------------------------
2356	 *   G     |   G   |    yes
2357	 * -----------------------------------------
2358	 */
2359
2360	if (ifa->address.sa.sa_family != fam) {
2361		/* forget non matching family */
2362		SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa_fam:%d fam:%d\n",
2363		    ifa->address.sa.sa_family, fam);
2364		return (NULL);
2365	}
2366	/* Ok the address may be ok */
2367	SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, &ifa->address.sa);
2368	SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst_is_loop:%d dest_is_priv:%d\n",
2369	    dest_is_loop, dest_is_priv);
2370	if ((dest_is_loop == 0) && (dest_is_priv == 0)) {
2371		dest_is_global = 1;
2372	}
2373#ifdef INET6
2374	if (fam == AF_INET6) {
2375		/* ok to use deprecated addresses? */
2376		if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2377			return (NULL);
2378		}
2379		if (ifa->src_is_priv) {
2380			/* Special case, linklocal to loop */
2381			if (dest_is_loop)
2382				return (NULL);
2383		}
2384	}
2385#endif
2386	/*
2387	 * Now that we know what is what, implement our table. This could in
2388	 * theory be done slicker (it used to be), but this is
2389	 * straightforward and easier to validate :-)
2390	 */
2391	SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_priv:%d\n",
2392	    ifa->src_is_loop,
2393	    dest_is_priv);
2394	if ((ifa->src_is_loop == 1) && (dest_is_priv)) {
2395		return (NULL);
2396	}
2397	SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_glob:%d\n",
2398	    ifa->src_is_loop,
2399	    dest_is_global);
2400	if ((ifa->src_is_loop == 1) && (dest_is_global)) {
2401		return (NULL);
2402	}
2403	SCTPDBG(SCTP_DEBUG_OUTPUT3, "address is acceptable\n");
2404	/* its an acceptable address */
2405	return (ifa);
2406}
2407
2408int
2409sctp_is_addr_restricted(struct sctp_tcb *stcb, struct sctp_ifa *ifa)
2410{
2411	struct sctp_laddr *laddr;
2412
2413	if (stcb == NULL) {
2414		/* There are no restrictions, no TCB :-) */
2415		return (0);
2416	}
2417	LIST_FOREACH(laddr, &stcb->asoc.sctp_restricted_addrs, sctp_nxt_addr) {
2418		if (laddr->ifa == NULL) {
2419			SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2420			    __FUNCTION__);
2421			continue;
2422		}
2423		if (laddr->ifa == ifa) {
2424			/* Yes it is on the list */
2425			return (1);
2426		}
2427	}
2428	return (0);
2429}
2430
2431
2432int
2433sctp_is_addr_in_ep(struct sctp_inpcb *inp, struct sctp_ifa *ifa)
2434{
2435	struct sctp_laddr *laddr;
2436
2437	if (ifa == NULL)
2438		return (0);
2439	LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2440		if (laddr->ifa == NULL) {
2441			SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2442			    __FUNCTION__);
2443			continue;
2444		}
2445		if ((laddr->ifa == ifa) && laddr->action == 0)
2446			/* same pointer */
2447			return (1);
2448	}
2449	return (0);
2450}
2451
2452
2453
2454static struct sctp_ifa *
2455sctp_choose_boundspecific_inp(struct sctp_inpcb *inp,
2456    sctp_route_t * ro,
2457    uint32_t vrf_id,
2458    int non_asoc_addr_ok,
2459    uint8_t dest_is_priv,
2460    uint8_t dest_is_loop,
2461    sa_family_t fam)
2462{
2463	struct sctp_laddr *laddr, *starting_point;
2464	void *ifn;
2465	int resettotop = 0;
2466	struct sctp_ifn *sctp_ifn;
2467	struct sctp_ifa *sctp_ifa, *sifa;
2468	struct sctp_vrf *vrf;
2469	uint32_t ifn_index;
2470
2471	vrf = sctp_find_vrf(vrf_id);
2472	if (vrf == NULL)
2473		return (NULL);
2474
2475	ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2476	ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2477	sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2478	/*
2479	 * first question, is the ifn we will emit on in our list, if so, we
2480	 * want such an address. Note that we first looked for a preferred
2481	 * address.
2482	 */
2483	if (sctp_ifn) {
2484		/* is a preferred one on the interface we route out? */
2485		LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2486#ifdef INET
2487			if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2488			    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2489			    &sctp_ifa->address.sin.sin_addr) != 0)) {
2490				continue;
2491			}
2492#endif
2493#ifdef INET6
2494			if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2495			    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2496			    &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2497				continue;
2498			}
2499#endif
2500			if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2501			    (non_asoc_addr_ok == 0))
2502				continue;
2503			sifa = sctp_is_ifa_addr_preferred(sctp_ifa,
2504			    dest_is_loop,
2505			    dest_is_priv, fam);
2506			if (sifa == NULL)
2507				continue;
2508			if (sctp_is_addr_in_ep(inp, sifa)) {
2509				atomic_add_int(&sifa->refcount, 1);
2510				return (sifa);
2511			}
2512		}
2513	}
2514	/*
2515	 * ok, now we now need to find one on the list of the addresses. We
2516	 * can't get one on the emitting interface so let's find first a
2517	 * preferred one. If not that an acceptable one otherwise... we
2518	 * return NULL.
2519	 */
2520	starting_point = inp->next_addr_touse;
2521once_again:
2522	if (inp->next_addr_touse == NULL) {
2523		inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2524		resettotop = 1;
2525	}
2526	for (laddr = inp->next_addr_touse; laddr;
2527	    laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2528		if (laddr->ifa == NULL) {
2529			/* address has been removed */
2530			continue;
2531		}
2532		if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2533			/* address is being deleted */
2534			continue;
2535		}
2536		sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop,
2537		    dest_is_priv, fam);
2538		if (sifa == NULL)
2539			continue;
2540		atomic_add_int(&sifa->refcount, 1);
2541		return (sifa);
2542	}
2543	if (resettotop == 0) {
2544		inp->next_addr_touse = NULL;
2545		goto once_again;
2546	}
2547	inp->next_addr_touse = starting_point;
2548	resettotop = 0;
2549once_again_too:
2550	if (inp->next_addr_touse == NULL) {
2551		inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2552		resettotop = 1;
2553	}
2554	/* ok, what about an acceptable address in the inp */
2555	for (laddr = inp->next_addr_touse; laddr;
2556	    laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2557		if (laddr->ifa == NULL) {
2558			/* address has been removed */
2559			continue;
2560		}
2561		if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2562			/* address is being deleted */
2563			continue;
2564		}
2565		sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2566		    dest_is_priv, fam);
2567		if (sifa == NULL)
2568			continue;
2569		atomic_add_int(&sifa->refcount, 1);
2570		return (sifa);
2571	}
2572	if (resettotop == 0) {
2573		inp->next_addr_touse = NULL;
2574		goto once_again_too;
2575	}
2576	/*
2577	 * no address bound can be a source for the destination we are in
2578	 * trouble
2579	 */
2580	return (NULL);
2581}
2582
2583
2584
2585static struct sctp_ifa *
2586sctp_choose_boundspecific_stcb(struct sctp_inpcb *inp,
2587    struct sctp_tcb *stcb,
2588    sctp_route_t * ro,
2589    uint32_t vrf_id,
2590    uint8_t dest_is_priv,
2591    uint8_t dest_is_loop,
2592    int non_asoc_addr_ok,
2593    sa_family_t fam)
2594{
2595	struct sctp_laddr *laddr, *starting_point;
2596	void *ifn;
2597	struct sctp_ifn *sctp_ifn;
2598	struct sctp_ifa *sctp_ifa, *sifa;
2599	uint8_t start_at_beginning = 0;
2600	struct sctp_vrf *vrf;
2601	uint32_t ifn_index;
2602
2603	/*
2604	 * first question, is the ifn we will emit on in our list, if so, we
2605	 * want that one.
2606	 */
2607	vrf = sctp_find_vrf(vrf_id);
2608	if (vrf == NULL)
2609		return (NULL);
2610
2611	ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2612	ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2613	sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2614
2615	/*
2616	 * first question, is the ifn we will emit on in our list?  If so,
2617	 * we want that one. First we look for a preferred. Second, we go
2618	 * for an acceptable.
2619	 */
2620	if (sctp_ifn) {
2621		/* first try for a preferred address on the ep */
2622		LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2623#ifdef INET
2624			if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2625			    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2626			    &sctp_ifa->address.sin.sin_addr) != 0)) {
2627				continue;
2628			}
2629#endif
2630#ifdef INET6
2631			if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2632			    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2633			    &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2634				continue;
2635			}
2636#endif
2637			if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2638				continue;
2639			if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2640				sifa = sctp_is_ifa_addr_preferred(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2641				if (sifa == NULL)
2642					continue;
2643				if (((non_asoc_addr_ok == 0) &&
2644				    (sctp_is_addr_restricted(stcb, sifa))) ||
2645				    (non_asoc_addr_ok &&
2646				    (sctp_is_addr_restricted(stcb, sifa)) &&
2647				    (!sctp_is_addr_pending(stcb, sifa)))) {
2648					/* on the no-no list */
2649					continue;
2650				}
2651				atomic_add_int(&sifa->refcount, 1);
2652				return (sifa);
2653			}
2654		}
2655		/* next try for an acceptable address on the ep */
2656		LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2657#ifdef INET
2658			if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2659			    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2660			    &sctp_ifa->address.sin.sin_addr) != 0)) {
2661				continue;
2662			}
2663#endif
2664#ifdef INET6
2665			if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2666			    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2667			    &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2668				continue;
2669			}
2670#endif
2671			if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2672				continue;
2673			if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2674				sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2675				if (sifa == NULL)
2676					continue;
2677				if (((non_asoc_addr_ok == 0) &&
2678				    (sctp_is_addr_restricted(stcb, sifa))) ||
2679				    (non_asoc_addr_ok &&
2680				    (sctp_is_addr_restricted(stcb, sifa)) &&
2681				    (!sctp_is_addr_pending(stcb, sifa)))) {
2682					/* on the no-no list */
2683					continue;
2684				}
2685				atomic_add_int(&sifa->refcount, 1);
2686				return (sifa);
2687			}
2688		}
2689
2690	}
2691	/*
2692	 * if we can't find one like that then we must look at all addresses
2693	 * bound to pick one at first preferable then secondly acceptable.
2694	 */
2695	starting_point = stcb->asoc.last_used_address;
2696sctp_from_the_top:
2697	if (stcb->asoc.last_used_address == NULL) {
2698		start_at_beginning = 1;
2699		stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2700	}
2701	/* search beginning with the last used address */
2702	for (laddr = stcb->asoc.last_used_address; laddr;
2703	    laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2704		if (laddr->ifa == NULL) {
2705			/* address has been removed */
2706			continue;
2707		}
2708		if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2709			/* address is being deleted */
2710			continue;
2711		}
2712		sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop, dest_is_priv, fam);
2713		if (sifa == NULL)
2714			continue;
2715		if (((non_asoc_addr_ok == 0) &&
2716		    (sctp_is_addr_restricted(stcb, sifa))) ||
2717		    (non_asoc_addr_ok &&
2718		    (sctp_is_addr_restricted(stcb, sifa)) &&
2719		    (!sctp_is_addr_pending(stcb, sifa)))) {
2720			/* on the no-no list */
2721			continue;
2722		}
2723		stcb->asoc.last_used_address = laddr;
2724		atomic_add_int(&sifa->refcount, 1);
2725		return (sifa);
2726	}
2727	if (start_at_beginning == 0) {
2728		stcb->asoc.last_used_address = NULL;
2729		goto sctp_from_the_top;
2730	}
2731	/* now try for any higher scope than the destination */
2732	stcb->asoc.last_used_address = starting_point;
2733	start_at_beginning = 0;
2734sctp_from_the_top2:
2735	if (stcb->asoc.last_used_address == NULL) {
2736		start_at_beginning = 1;
2737		stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2738	}
2739	/* search beginning with the last used address */
2740	for (laddr = stcb->asoc.last_used_address; laddr;
2741	    laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2742		if (laddr->ifa == NULL) {
2743			/* address has been removed */
2744			continue;
2745		}
2746		if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2747			/* address is being deleted */
2748			continue;
2749		}
2750		sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2751		    dest_is_priv, fam);
2752		if (sifa == NULL)
2753			continue;
2754		if (((non_asoc_addr_ok == 0) &&
2755		    (sctp_is_addr_restricted(stcb, sifa))) ||
2756		    (non_asoc_addr_ok &&
2757		    (sctp_is_addr_restricted(stcb, sifa)) &&
2758		    (!sctp_is_addr_pending(stcb, sifa)))) {
2759			/* on the no-no list */
2760			continue;
2761		}
2762		stcb->asoc.last_used_address = laddr;
2763		atomic_add_int(&sifa->refcount, 1);
2764		return (sifa);
2765	}
2766	if (start_at_beginning == 0) {
2767		stcb->asoc.last_used_address = NULL;
2768		goto sctp_from_the_top2;
2769	}
2770	return (NULL);
2771}
2772
2773static struct sctp_ifa *
2774sctp_select_nth_preferred_addr_from_ifn_boundall(struct sctp_ifn *ifn,
2775    struct sctp_inpcb *inp,
2776    struct sctp_tcb *stcb,
2777    int non_asoc_addr_ok,
2778    uint8_t dest_is_loop,
2779    uint8_t dest_is_priv,
2780    int addr_wanted,
2781    sa_family_t fam,
2782    sctp_route_t * ro
2783)
2784{
2785	struct sctp_ifa *ifa, *sifa;
2786	int num_eligible_addr = 0;
2787
2788#ifdef INET6
2789	struct sockaddr_in6 sin6, lsa6;
2790
2791	if (fam == AF_INET6) {
2792		memcpy(&sin6, &ro->ro_dst, sizeof(struct sockaddr_in6));
2793		(void)sa6_recoverscope(&sin6);
2794	}
2795#endif				/* INET6 */
2796	LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2797#ifdef INET
2798		if ((ifa->address.sa.sa_family == AF_INET) &&
2799		    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2800		    &ifa->address.sin.sin_addr) != 0)) {
2801			continue;
2802		}
2803#endif
2804#ifdef INET6
2805		if ((ifa->address.sa.sa_family == AF_INET6) &&
2806		    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2807		    &ifa->address.sin6.sin6_addr) != 0)) {
2808			continue;
2809		}
2810#endif
2811		if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2812		    (non_asoc_addr_ok == 0))
2813			continue;
2814		sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2815		    dest_is_priv, fam);
2816		if (sifa == NULL)
2817			continue;
2818#ifdef INET6
2819		if (fam == AF_INET6 &&
2820		    dest_is_loop &&
2821		    sifa->src_is_loop && sifa->src_is_priv) {
2822			/*
2823			 * don't allow fe80::1 to be a src on loop ::1, we
2824			 * don't list it to the peer so we will get an
2825			 * abort.
2826			 */
2827			continue;
2828		}
2829		if (fam == AF_INET6 &&
2830		    IN6_IS_ADDR_LINKLOCAL(&sifa->address.sin6.sin6_addr) &&
2831		    IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr)) {
2832			/*
2833			 * link-local <-> link-local must belong to the same
2834			 * scope.
2835			 */
2836			memcpy(&lsa6, &sifa->address.sin6, sizeof(struct sockaddr_in6));
2837			(void)sa6_recoverscope(&lsa6);
2838			if (sin6.sin6_scope_id != lsa6.sin6_scope_id) {
2839				continue;
2840			}
2841		}
2842#endif				/* INET6 */
2843
2844		/*
2845		 * Check if the IPv6 address matches to next-hop. In the
2846		 * mobile case, old IPv6 address may be not deleted from the
2847		 * interface. Then, the interface has previous and new
2848		 * addresses.  We should use one corresponding to the
2849		 * next-hop.  (by micchie)
2850		 */
2851#ifdef INET6
2852		if (stcb && fam == AF_INET6 &&
2853		    sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2854			if (sctp_v6src_match_nexthop(&sifa->address.sin6, ro)
2855			    == 0) {
2856				continue;
2857			}
2858		}
2859#endif
2860#ifdef INET
2861		/* Avoid topologically incorrect IPv4 address */
2862		if (stcb && fam == AF_INET &&
2863		    sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2864			if (sctp_v4src_match_nexthop(sifa, ro) == 0) {
2865				continue;
2866			}
2867		}
2868#endif
2869		if (stcb) {
2870			if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
2871				continue;
2872			}
2873			if (((non_asoc_addr_ok == 0) &&
2874			    (sctp_is_addr_restricted(stcb, sifa))) ||
2875			    (non_asoc_addr_ok &&
2876			    (sctp_is_addr_restricted(stcb, sifa)) &&
2877			    (!sctp_is_addr_pending(stcb, sifa)))) {
2878				/*
2879				 * It is restricted for some reason..
2880				 * probably not yet added.
2881				 */
2882				continue;
2883			}
2884		}
2885		if (num_eligible_addr >= addr_wanted) {
2886			return (sifa);
2887		}
2888		num_eligible_addr++;
2889	}
2890	return (NULL);
2891}
2892
2893
2894static int
2895sctp_count_num_preferred_boundall(struct sctp_ifn *ifn,
2896    struct sctp_inpcb *inp,
2897    struct sctp_tcb *stcb,
2898    int non_asoc_addr_ok,
2899    uint8_t dest_is_loop,
2900    uint8_t dest_is_priv,
2901    sa_family_t fam)
2902{
2903	struct sctp_ifa *ifa, *sifa;
2904	int num_eligible_addr = 0;
2905
2906	LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2907#ifdef INET
2908		if ((ifa->address.sa.sa_family == AF_INET) &&
2909		    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2910		    &ifa->address.sin.sin_addr) != 0)) {
2911			continue;
2912		}
2913#endif
2914#ifdef INET6
2915		if ((ifa->address.sa.sa_family == AF_INET6) &&
2916		    (stcb != NULL) &&
2917		    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2918		    &ifa->address.sin6.sin6_addr) != 0)) {
2919			continue;
2920		}
2921#endif
2922		if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2923		    (non_asoc_addr_ok == 0)) {
2924			continue;
2925		}
2926		sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2927		    dest_is_priv, fam);
2928		if (sifa == NULL) {
2929			continue;
2930		}
2931		if (stcb) {
2932			if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
2933				continue;
2934			}
2935			if (((non_asoc_addr_ok == 0) &&
2936			    (sctp_is_addr_restricted(stcb, sifa))) ||
2937			    (non_asoc_addr_ok &&
2938			    (sctp_is_addr_restricted(stcb, sifa)) &&
2939			    (!sctp_is_addr_pending(stcb, sifa)))) {
2940				/*
2941				 * It is restricted for some reason..
2942				 * probably not yet added.
2943				 */
2944				continue;
2945			}
2946		}
2947		num_eligible_addr++;
2948	}
2949	return (num_eligible_addr);
2950}
2951
2952static struct sctp_ifa *
2953sctp_choose_boundall(struct sctp_inpcb *inp,
2954    struct sctp_tcb *stcb,
2955    struct sctp_nets *net,
2956    sctp_route_t * ro,
2957    uint32_t vrf_id,
2958    uint8_t dest_is_priv,
2959    uint8_t dest_is_loop,
2960    int non_asoc_addr_ok,
2961    sa_family_t fam)
2962{
2963	int cur_addr_num = 0, num_preferred = 0;
2964	void *ifn;
2965	struct sctp_ifn *sctp_ifn, *looked_at = NULL, *emit_ifn;
2966	struct sctp_ifa *sctp_ifa, *sifa;
2967	uint32_t ifn_index;
2968	struct sctp_vrf *vrf;
2969
2970#ifdef INET
2971	int retried = 0;
2972
2973#endif
2974
2975	/*-
2976	 * For boundall we can use any address in the association.
2977	 * If non_asoc_addr_ok is set we can use any address (at least in
2978	 * theory). So we look for preferred addresses first. If we find one,
2979	 * we use it. Otherwise we next try to get an address on the
2980	 * interface, which we should be able to do (unless non_asoc_addr_ok
2981	 * is false and we are routed out that way). In these cases where we
2982	 * can't use the address of the interface we go through all the
2983	 * ifn's looking for an address we can use and fill that in. Punting
2984	 * means we send back address 0, which will probably cause problems
2985	 * actually since then IP will fill in the address of the route ifn,
2986	 * which means we probably already rejected it.. i.e. here comes an
2987	 * abort :-<.
2988	 */
2989	vrf = sctp_find_vrf(vrf_id);
2990	if (vrf == NULL)
2991		return (NULL);
2992
2993	ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2994	ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2995	SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn from route:%p ifn_index:%d\n", ifn, ifn_index);
2996	emit_ifn = looked_at = sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2997	if (sctp_ifn == NULL) {
2998		/* ?? We don't have this guy ?? */
2999		SCTPDBG(SCTP_DEBUG_OUTPUT2, "No ifn emit interface?\n");
3000		goto bound_all_plan_b;
3001	}
3002	SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn_index:%d name:%s is emit interface\n",
3003	    ifn_index, sctp_ifn->ifn_name);
3004
3005	if (net) {
3006		cur_addr_num = net->indx_of_eligible_next_to_use;
3007	}
3008	num_preferred = sctp_count_num_preferred_boundall(sctp_ifn,
3009	    inp, stcb,
3010	    non_asoc_addr_ok,
3011	    dest_is_loop,
3012	    dest_is_priv, fam);
3013	SCTPDBG(SCTP_DEBUG_OUTPUT2, "Found %d preferred source addresses for intf:%s\n",
3014	    num_preferred, sctp_ifn->ifn_name);
3015	if (num_preferred == 0) {
3016		/*
3017		 * no eligible addresses, we must use some other interface
3018		 * address if we can find one.
3019		 */
3020		goto bound_all_plan_b;
3021	}
3022	/*
3023	 * Ok we have num_eligible_addr set with how many we can use, this
3024	 * may vary from call to call due to addresses being deprecated
3025	 * etc..
3026	 */
3027	if (cur_addr_num >= num_preferred) {
3028		cur_addr_num = 0;
3029	}
3030	/*
3031	 * select the nth address from the list (where cur_addr_num is the
3032	 * nth) and 0 is the first one, 1 is the second one etc...
3033	 */
3034	SCTPDBG(SCTP_DEBUG_OUTPUT2, "cur_addr_num:%d\n", cur_addr_num);
3035
3036	sctp_ifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok, dest_is_loop,
3037	    dest_is_priv, cur_addr_num, fam, ro);
3038
3039	/* if sctp_ifa is NULL something changed??, fall to plan b. */
3040	if (sctp_ifa) {
3041		atomic_add_int(&sctp_ifa->refcount, 1);
3042		if (net) {
3043			/* save off where the next one we will want */
3044			net->indx_of_eligible_next_to_use = cur_addr_num + 1;
3045		}
3046		return (sctp_ifa);
3047	}
3048	/*
3049	 * plan_b: Look at all interfaces and find a preferred address. If
3050	 * no preferred fall through to plan_c.
3051	 */
3052bound_all_plan_b:
3053	SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan B\n");
3054	LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3055		SCTPDBG(SCTP_DEBUG_OUTPUT2, "Examine interface %s\n",
3056		    sctp_ifn->ifn_name);
3057		if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3058			/* wrong base scope */
3059			SCTPDBG(SCTP_DEBUG_OUTPUT2, "skip\n");
3060			continue;
3061		}
3062		if ((sctp_ifn == looked_at) && looked_at) {
3063			/* already looked at this guy */
3064			SCTPDBG(SCTP_DEBUG_OUTPUT2, "already seen\n");
3065			continue;
3066		}
3067		num_preferred = sctp_count_num_preferred_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok,
3068		    dest_is_loop, dest_is_priv, fam);
3069		SCTPDBG(SCTP_DEBUG_OUTPUT2,
3070		    "Found ifn:%p %d preferred source addresses\n",
3071		    ifn, num_preferred);
3072		if (num_preferred == 0) {
3073			/* None on this interface. */
3074			SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefered -- skipping to next\n");
3075			continue;
3076		}
3077		SCTPDBG(SCTP_DEBUG_OUTPUT2,
3078		    "num preferred:%d on interface:%p cur_addr_num:%d\n",
3079		    num_preferred, (void *)sctp_ifn, cur_addr_num);
3080
3081		/*
3082		 * Ok we have num_eligible_addr set with how many we can
3083		 * use, this may vary from call to call due to addresses
3084		 * being deprecated etc..
3085		 */
3086		if (cur_addr_num >= num_preferred) {
3087			cur_addr_num = 0;
3088		}
3089		sifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok, dest_is_loop,
3090		    dest_is_priv, cur_addr_num, fam, ro);
3091		if (sifa == NULL)
3092			continue;
3093		if (net) {
3094			net->indx_of_eligible_next_to_use = cur_addr_num + 1;
3095			SCTPDBG(SCTP_DEBUG_OUTPUT2, "we selected %d\n",
3096			    cur_addr_num);
3097			SCTPDBG(SCTP_DEBUG_OUTPUT2, "Source:");
3098			SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
3099			SCTPDBG(SCTP_DEBUG_OUTPUT2, "Dest:");
3100			SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &net->ro._l_addr.sa);
3101		}
3102		atomic_add_int(&sifa->refcount, 1);
3103		return (sifa);
3104	}
3105#ifdef INET
3106again_with_private_addresses_allowed:
3107#endif
3108	/* plan_c: do we have an acceptable address on the emit interface */
3109	sifa = NULL;
3110	SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan C: find acceptable on interface\n");
3111	if (emit_ifn == NULL) {
3112		SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jump to Plan D - no emit_ifn\n");
3113		goto plan_d;
3114	}
3115	LIST_FOREACH(sctp_ifa, &emit_ifn->ifalist, next_ifa) {
3116		SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifa:%p\n", (void *)sctp_ifa);
3117#ifdef INET
3118		if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3119		    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3120		    &sctp_ifa->address.sin.sin_addr) != 0)) {
3121			SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jailed\n");
3122			continue;
3123		}
3124#endif
3125#ifdef INET6
3126		if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3127		    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3128		    &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3129			SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jailed\n");
3130			continue;
3131		}
3132#endif
3133		if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3134		    (non_asoc_addr_ok == 0)) {
3135			SCTPDBG(SCTP_DEBUG_OUTPUT2, "Defer\n");
3136			continue;
3137		}
3138		sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop,
3139		    dest_is_priv, fam);
3140		if (sifa == NULL) {
3141			SCTPDBG(SCTP_DEBUG_OUTPUT2, "IFA not acceptable\n");
3142			continue;
3143		}
3144		if (stcb) {
3145			if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
3146				SCTPDBG(SCTP_DEBUG_OUTPUT2, "NOT in scope\n");
3147				sifa = NULL;
3148				continue;
3149			}
3150			if (((non_asoc_addr_ok == 0) &&
3151			    (sctp_is_addr_restricted(stcb, sifa))) ||
3152			    (non_asoc_addr_ok &&
3153			    (sctp_is_addr_restricted(stcb, sifa)) &&
3154			    (!sctp_is_addr_pending(stcb, sifa)))) {
3155				/*
3156				 * It is restricted for some reason..
3157				 * probably not yet added.
3158				 */
3159				SCTPDBG(SCTP_DEBUG_OUTPUT2, "Its resticted\n");
3160				sifa = NULL;
3161				continue;
3162			}
3163		} else {
3164			SCTP_PRINTF("Stcb is null - no print\n");
3165		}
3166		atomic_add_int(&sifa->refcount, 1);
3167		goto out;
3168	}
3169plan_d:
3170	/*
3171	 * plan_d: We are in trouble. No preferred address on the emit
3172	 * interface. And not even a preferred address on all interfaces. Go
3173	 * out and see if we can find an acceptable address somewhere
3174	 * amongst all interfaces.
3175	 */
3176	SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan D looked_at is %p\n", (void *)looked_at);
3177	LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3178		if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3179			/* wrong base scope */
3180			continue;
3181		}
3182		LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3183#ifdef INET
3184			if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3185			    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3186			    &sctp_ifa->address.sin.sin_addr) != 0)) {
3187				continue;
3188			}
3189#endif
3190#ifdef INET6
3191			if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3192			    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3193			    &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3194				continue;
3195			}
3196#endif
3197			if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3198			    (non_asoc_addr_ok == 0))
3199				continue;
3200			sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3201			    dest_is_loop,
3202			    dest_is_priv, fam);
3203			if (sifa == NULL)
3204				continue;
3205			if (stcb) {
3206				if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
3207					sifa = NULL;
3208					continue;
3209				}
3210				if (((non_asoc_addr_ok == 0) &&
3211				    (sctp_is_addr_restricted(stcb, sifa))) ||
3212				    (non_asoc_addr_ok &&
3213				    (sctp_is_addr_restricted(stcb, sifa)) &&
3214				    (!sctp_is_addr_pending(stcb, sifa)))) {
3215					/*
3216					 * It is restricted for some
3217					 * reason.. probably not yet added.
3218					 */
3219					sifa = NULL;
3220					continue;
3221				}
3222			}
3223			goto out;
3224		}
3225	}
3226#ifdef INET
3227	if ((retried == 0) && (stcb->asoc.scope.ipv4_local_scope == 0)) {
3228		stcb->asoc.scope.ipv4_local_scope = 1;
3229		retried = 1;
3230		goto again_with_private_addresses_allowed;
3231	} else if (retried == 1) {
3232		stcb->asoc.scope.ipv4_local_scope = 0;
3233	}
3234#endif
3235out:
3236#ifdef INET
3237	if (sifa) {
3238		if (retried == 1) {
3239			LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3240				if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3241					/* wrong base scope */
3242					continue;
3243				}
3244				LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3245					struct sctp_ifa *tmp_sifa;
3246
3247#ifdef INET
3248					if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3249					    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3250					    &sctp_ifa->address.sin.sin_addr) != 0)) {
3251						continue;
3252					}
3253#endif
3254#ifdef INET6
3255					if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3256					    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3257					    &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3258						continue;
3259					}
3260#endif
3261					if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3262					    (non_asoc_addr_ok == 0))
3263						continue;
3264					tmp_sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3265					    dest_is_loop,
3266					    dest_is_priv, fam);
3267					if (tmp_sifa == NULL) {
3268						continue;
3269					}
3270					if (tmp_sifa == sifa) {
3271						continue;
3272					}
3273					if (stcb) {
3274						if (sctp_is_address_in_scope(tmp_sifa,
3275						    &stcb->asoc.scope, 0) == 0) {
3276							continue;
3277						}
3278						if (((non_asoc_addr_ok == 0) &&
3279						    (sctp_is_addr_restricted(stcb, tmp_sifa))) ||
3280						    (non_asoc_addr_ok &&
3281						    (sctp_is_addr_restricted(stcb, tmp_sifa)) &&
3282						    (!sctp_is_addr_pending(stcb, tmp_sifa)))) {
3283							/*
3284							 * It is restricted
3285							 * for some reason..
3286							 * probably not yet
3287							 * added.
3288							 */
3289							continue;
3290						}
3291					}
3292					if ((tmp_sifa->address.sin.sin_family == AF_INET) &&
3293					    (IN4_ISPRIVATE_ADDRESS(&(tmp_sifa->address.sin.sin_addr)))) {
3294						sctp_add_local_addr_restricted(stcb, tmp_sifa);
3295					}
3296				}
3297			}
3298		}
3299		atomic_add_int(&sifa->refcount, 1);
3300	}
3301#endif
3302	return (sifa);
3303}
3304
3305
3306
3307/* tcb may be NULL */
3308struct sctp_ifa *
3309sctp_source_address_selection(struct sctp_inpcb *inp,
3310    struct sctp_tcb *stcb,
3311    sctp_route_t * ro,
3312    struct sctp_nets *net,
3313    int non_asoc_addr_ok, uint32_t vrf_id)
3314{
3315	struct sctp_ifa *answer;
3316	uint8_t dest_is_priv, dest_is_loop;
3317	sa_family_t fam;
3318
3319#ifdef INET
3320	struct sockaddr_in *to = (struct sockaddr_in *)&ro->ro_dst;
3321
3322#endif
3323#ifdef INET6
3324	struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&ro->ro_dst;
3325
3326#endif
3327
3328	/**
3329	 * Rules: - Find the route if needed, cache if I can. - Look at
3330	 * interface address in route, Is it in the bound list. If so we
3331	 * have the best source. - If not we must rotate amongst the
3332	 * addresses.
3333	 *
3334	 * Cavets and issues
3335	 *
3336	 * Do we need to pay attention to scope. We can have a private address
3337	 * or a global address we are sourcing or sending to. So if we draw
3338	 * it out
3339	 * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3340	 * For V4
3341	 * ------------------------------------------
3342	 *      source     *      dest  *  result
3343	 * -----------------------------------------
3344	 * <a>  Private    *    Global  *  NAT
3345	 * -----------------------------------------
3346	 * <b>  Private    *    Private *  No problem
3347	 * -----------------------------------------
3348	 * <c>  Global     *    Private *  Huh, How will this work?
3349	 * -----------------------------------------
3350	 * <d>  Global     *    Global  *  No Problem
3351	 *------------------------------------------
3352	 * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3353	 * For V6
3354	 *------------------------------------------
3355	 *      source     *      dest  *  result
3356	 * -----------------------------------------
3357	 * <a>  Linklocal  *    Global  *
3358	 * -----------------------------------------
3359	 * <b>  Linklocal  * Linklocal  *  No problem
3360	 * -----------------------------------------
3361	 * <c>  Global     * Linklocal  *  Huh, How will this work?
3362	 * -----------------------------------------
3363	 * <d>  Global     *    Global  *  No Problem
3364	 *------------------------------------------
3365	 * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3366	 *
3367	 * And then we add to that what happens if there are multiple addresses
3368	 * assigned to an interface. Remember the ifa on a ifn is a linked
3369	 * list of addresses. So one interface can have more than one IP
3370	 * address. What happens if we have both a private and a global
3371	 * address? Do we then use context of destination to sort out which
3372	 * one is best? And what about NAT's sending P->G may get you a NAT
3373	 * translation, or should you select the G thats on the interface in
3374	 * preference.
3375	 *
3376	 * Decisions:
3377	 *
3378	 * - count the number of addresses on the interface.
3379	 * - if it is one, no problem except case <c>.
3380	 *   For <a> we will assume a NAT out there.
3381	 * - if there are more than one, then we need to worry about scope P
3382	 *   or G. We should prefer G -> G and P -> P if possible.
3383	 *   Then as a secondary fall back to mixed types G->P being a last
3384	 *   ditch one.
3385	 * - The above all works for bound all, but bound specific we need to
3386	 *   use the same concept but instead only consider the bound
3387	 *   addresses. If the bound set is NOT assigned to the interface then
3388	 *   we must use rotation amongst the bound addresses..
3389	 */
3390	if (ro->ro_rt == NULL) {
3391		/*
3392		 * Need a route to cache.
3393		 */
3394		SCTP_RTALLOC(ro, vrf_id);
3395	}
3396	if (ro->ro_rt == NULL) {
3397		return (NULL);
3398	}
3399	fam = ro->ro_dst.sa_family;
3400	dest_is_priv = dest_is_loop = 0;
3401	/* Setup our scopes for the destination */
3402	switch (fam) {
3403#ifdef INET
3404	case AF_INET:
3405		/* Scope based on outbound address */
3406		if (IN4_ISLOOPBACK_ADDRESS(&to->sin_addr)) {
3407			dest_is_loop = 1;
3408			if (net != NULL) {
3409				/* mark it as local */
3410				net->addr_is_local = 1;
3411			}
3412		} else if ((IN4_ISPRIVATE_ADDRESS(&to->sin_addr))) {
3413			dest_is_priv = 1;
3414		}
3415		break;
3416#endif
3417#ifdef INET6
3418	case AF_INET6:
3419		/* Scope based on outbound address */
3420		if (IN6_IS_ADDR_LOOPBACK(&to6->sin6_addr) ||
3421		    SCTP_ROUTE_IS_REAL_LOOP(ro)) {
3422			/*
3423			 * If the address is a loopback address, which
3424			 * consists of "::1" OR "fe80::1%lo0", we are
3425			 * loopback scope. But we don't use dest_is_priv
3426			 * (link local addresses).
3427			 */
3428			dest_is_loop = 1;
3429			if (net != NULL) {
3430				/* mark it as local */
3431				net->addr_is_local = 1;
3432			}
3433		} else if (IN6_IS_ADDR_LINKLOCAL(&to6->sin6_addr)) {
3434			dest_is_priv = 1;
3435		}
3436		break;
3437#endif
3438	}
3439	SCTPDBG(SCTP_DEBUG_OUTPUT2, "Select source addr for:");
3440	SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&ro->ro_dst);
3441	SCTP_IPI_ADDR_RLOCK();
3442	if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
3443		/*
3444		 * Bound all case
3445		 */
3446		answer = sctp_choose_boundall(inp, stcb, net, ro, vrf_id,
3447		    dest_is_priv, dest_is_loop,
3448		    non_asoc_addr_ok, fam);
3449		SCTP_IPI_ADDR_RUNLOCK();
3450		return (answer);
3451	}
3452	/*
3453	 * Subset bound case
3454	 */
3455	if (stcb) {
3456		answer = sctp_choose_boundspecific_stcb(inp, stcb, ro,
3457		    vrf_id, dest_is_priv,
3458		    dest_is_loop,
3459		    non_asoc_addr_ok, fam);
3460	} else {
3461		answer = sctp_choose_boundspecific_inp(inp, ro, vrf_id,
3462		    non_asoc_addr_ok,
3463		    dest_is_priv,
3464		    dest_is_loop, fam);
3465	}
3466	SCTP_IPI_ADDR_RUNLOCK();
3467	return (answer);
3468}
3469
3470static int
3471sctp_find_cmsg(int c_type, void *data, struct mbuf *control, size_t cpsize)
3472{
3473	struct cmsghdr cmh;
3474	int tlen, at, found;
3475	struct sctp_sndinfo sndinfo;
3476	struct sctp_prinfo prinfo;
3477	struct sctp_authinfo authinfo;
3478
3479	tlen = SCTP_BUF_LEN(control);
3480	at = 0;
3481	found = 0;
3482	/*
3483	 * Independent of how many mbufs, find the c_type inside the control
3484	 * structure and copy out the data.
3485	 */
3486	while (at < tlen) {
3487		if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3488			/* There is not enough room for one more. */
3489			return (found);
3490		}
3491		m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3492		if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3493			/* We dont't have a complete CMSG header. */
3494			return (found);
3495		}
3496		if (((int)cmh.cmsg_len + at) > tlen) {
3497			/* We don't have the complete CMSG. */
3498			return (found);
3499		}
3500		if ((cmh.cmsg_level == IPPROTO_SCTP) &&
3501		    ((c_type == cmh.cmsg_type) ||
3502		    ((c_type == SCTP_SNDRCV) &&
3503		    ((cmh.cmsg_type == SCTP_SNDINFO) ||
3504		    (cmh.cmsg_type == SCTP_PRINFO) ||
3505		    (cmh.cmsg_type == SCTP_AUTHINFO))))) {
3506			if (c_type == cmh.cmsg_type) {
3507				if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < cpsize) {
3508					return (found);
3509				}
3510				/* It is exactly what we want. Copy it out. */
3511				m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), cpsize, (caddr_t)data);
3512				return (1);
3513			} else {
3514				struct sctp_sndrcvinfo *sndrcvinfo;
3515
3516				sndrcvinfo = (struct sctp_sndrcvinfo *)data;
3517				if (found == 0) {
3518					if (cpsize < sizeof(struct sctp_sndrcvinfo)) {
3519						return (found);
3520					}
3521					memset(sndrcvinfo, 0, sizeof(struct sctp_sndrcvinfo));
3522				}
3523				switch (cmh.cmsg_type) {
3524				case SCTP_SNDINFO:
3525					if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_sndinfo)) {
3526						return (found);
3527					}
3528					m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_sndinfo), (caddr_t)&sndinfo);
3529					sndrcvinfo->sinfo_stream = sndinfo.snd_sid;
3530					sndrcvinfo->sinfo_flags = sndinfo.snd_flags;
3531					sndrcvinfo->sinfo_ppid = sndinfo.snd_ppid;
3532					sndrcvinfo->sinfo_context = sndinfo.snd_context;
3533					sndrcvinfo->sinfo_assoc_id = sndinfo.snd_assoc_id;
3534					break;
3535				case SCTP_PRINFO:
3536					if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_prinfo)) {
3537						return (found);
3538					}
3539					m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_prinfo), (caddr_t)&prinfo);
3540					if (prinfo.pr_policy != SCTP_PR_SCTP_NONE) {
3541						sndrcvinfo->sinfo_timetolive = prinfo.pr_value;
3542					} else {
3543						sndrcvinfo->sinfo_timetolive = 0;
3544					}
3545					sndrcvinfo->sinfo_flags |= prinfo.pr_policy;
3546					break;
3547				case SCTP_AUTHINFO:
3548					if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_authinfo)) {
3549						return (found);
3550					}
3551					m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_authinfo), (caddr_t)&authinfo);
3552					sndrcvinfo->sinfo_keynumber_valid = 1;
3553					sndrcvinfo->sinfo_keynumber = authinfo.auth_keynumber;
3554					break;
3555				default:
3556					return (found);
3557				}
3558				found = 1;
3559			}
3560		}
3561		at += CMSG_ALIGN(cmh.cmsg_len);
3562	}
3563	return (found);
3564}
3565
3566static int
3567sctp_process_cmsgs_for_init(struct sctp_tcb *stcb, struct mbuf *control, int *error)
3568{
3569	struct cmsghdr cmh;
3570	int tlen, at;
3571	struct sctp_initmsg initmsg;
3572
3573#ifdef INET
3574	struct sockaddr_in sin;
3575
3576#endif
3577#ifdef INET6
3578	struct sockaddr_in6 sin6;
3579
3580#endif
3581
3582	tlen = SCTP_BUF_LEN(control);
3583	at = 0;
3584	while (at < tlen) {
3585		if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3586			/* There is not enough room for one more. */
3587			*error = EINVAL;
3588			return (1);
3589		}
3590		m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3591		if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3592			/* We dont't have a complete CMSG header. */
3593			*error = EINVAL;
3594			return (1);
3595		}
3596		if (((int)cmh.cmsg_len + at) > tlen) {
3597			/* We don't have the complete CMSG. */
3598			*error = EINVAL;
3599			return (1);
3600		}
3601		if (cmh.cmsg_level == IPPROTO_SCTP) {
3602			switch (cmh.cmsg_type) {
3603			case SCTP_INIT:
3604				if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_initmsg)) {
3605					*error = EINVAL;
3606					return (1);
3607				}
3608				m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_initmsg), (caddr_t)&initmsg);
3609				if (initmsg.sinit_max_attempts)
3610					stcb->asoc.max_init_times = initmsg.sinit_max_attempts;
3611				if (initmsg.sinit_num_ostreams)
3612					stcb->asoc.pre_open_streams = initmsg.sinit_num_ostreams;
3613				if (initmsg.sinit_max_instreams)
3614					stcb->asoc.max_inbound_streams = initmsg.sinit_max_instreams;
3615				if (initmsg.sinit_max_init_timeo)
3616					stcb->asoc.initial_init_rto_max = initmsg.sinit_max_init_timeo;
3617				if (stcb->asoc.streamoutcnt < stcb->asoc.pre_open_streams) {
3618					struct sctp_stream_out *tmp_str;
3619					unsigned int i;
3620
3621#if defined(SCTP_DETAILED_STR_STATS)
3622					int j;
3623
3624#endif
3625
3626					/* Default is NOT correct */
3627					SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, default:%d pre_open:%d\n",
3628					    stcb->asoc.streamoutcnt, stcb->asoc.pre_open_streams);
3629					SCTP_TCB_UNLOCK(stcb);
3630					SCTP_MALLOC(tmp_str,
3631					    struct sctp_stream_out *,
3632					    (stcb->asoc.pre_open_streams * sizeof(struct sctp_stream_out)),
3633					    SCTP_M_STRMO);
3634					SCTP_TCB_LOCK(stcb);
3635					if (tmp_str != NULL) {
3636						SCTP_FREE(stcb->asoc.strmout, SCTP_M_STRMO);
3637						stcb->asoc.strmout = tmp_str;
3638						stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt = stcb->asoc.pre_open_streams;
3639					} else {
3640						stcb->asoc.pre_open_streams = stcb->asoc.streamoutcnt;
3641					}
3642					for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3643						TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
3644						stcb->asoc.strmout[i].chunks_on_queues = 0;
3645						stcb->asoc.strmout[i].next_sequence_send = 0;
3646#if defined(SCTP_DETAILED_STR_STATS)
3647						for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
3648							stcb->asoc.strmout[i].abandoned_sent[j] = 0;
3649							stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
3650						}
3651#else
3652						stcb->asoc.strmout[i].abandoned_sent[0] = 0;
3653						stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
3654#endif
3655						stcb->asoc.strmout[i].stream_no = i;
3656						stcb->asoc.strmout[i].last_msg_incomplete = 0;
3657						stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], NULL);
3658					}
3659				}
3660				break;
3661#ifdef INET
3662			case SCTP_DSTADDRV4:
3663				if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in_addr)) {
3664					*error = EINVAL;
3665					return (1);
3666				}
3667				memset(&sin, 0, sizeof(struct sockaddr_in));
3668				sin.sin_family = AF_INET;
3669				sin.sin_len = sizeof(struct sockaddr_in);
3670				sin.sin_port = stcb->rport;
3671				m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3672				if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3673				    (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3674				    IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3675					*error = EINVAL;
3676					return (1);
3677				}
3678				if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL,
3679				    SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3680					*error = ENOBUFS;
3681					return (1);
3682				}
3683				break;
3684#endif
3685#ifdef INET6
3686			case SCTP_DSTADDRV6:
3687				if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in6_addr)) {
3688					*error = EINVAL;
3689					return (1);
3690				}
3691				memset(&sin6, 0, sizeof(struct sockaddr_in6));
3692				sin6.sin6_family = AF_INET6;
3693				sin6.sin6_len = sizeof(struct sockaddr_in6);
3694				sin6.sin6_port = stcb->rport;
3695				m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3696				if (IN6_IS_ADDR_UNSPECIFIED(&sin6.sin6_addr) ||
3697				    IN6_IS_ADDR_MULTICAST(&sin6.sin6_addr)) {
3698					*error = EINVAL;
3699					return (1);
3700				}
3701#ifdef INET
3702				if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3703					in6_sin6_2_sin(&sin, &sin6);
3704					if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3705					    (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3706					    IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3707						*error = EINVAL;
3708						return (1);
3709					}
3710					if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL,
3711					    SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3712						*error = ENOBUFS;
3713						return (1);
3714					}
3715				} else
3716#endif
3717					if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin6, NULL,
3718				    SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3719					*error = ENOBUFS;
3720					return (1);
3721				}
3722				break;
3723#endif
3724			default:
3725				break;
3726			}
3727		}
3728		at += CMSG_ALIGN(cmh.cmsg_len);
3729	}
3730	return (0);
3731}
3732
3733static struct sctp_tcb *
3734sctp_findassociation_cmsgs(struct sctp_inpcb **inp_p,
3735    uint16_t port,
3736    struct mbuf *control,
3737    struct sctp_nets **net_p,
3738    int *error)
3739{
3740	struct cmsghdr cmh;
3741	int tlen, at;
3742	struct sctp_tcb *stcb;
3743	struct sockaddr *addr;
3744
3745#ifdef INET
3746	struct sockaddr_in sin;
3747
3748#endif
3749#ifdef INET6
3750	struct sockaddr_in6 sin6;
3751
3752#endif
3753
3754	tlen = SCTP_BUF_LEN(control);
3755	at = 0;
3756	while (at < tlen) {
3757		if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3758			/* There is not enough room for one more. */
3759			*error = EINVAL;
3760			return (NULL);
3761		}
3762		m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3763		if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3764			/* We dont't have a complete CMSG header. */
3765			*error = EINVAL;
3766			return (NULL);
3767		}
3768		if (((int)cmh.cmsg_len + at) > tlen) {
3769			/* We don't have the complete CMSG. */
3770			*error = EINVAL;
3771			return (NULL);
3772		}
3773		if (cmh.cmsg_level == IPPROTO_SCTP) {
3774			switch (cmh.cmsg_type) {
3775#ifdef INET
3776			case SCTP_DSTADDRV4:
3777				if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in_addr)) {
3778					*error = EINVAL;
3779					return (NULL);
3780				}
3781				memset(&sin, 0, sizeof(struct sockaddr_in));
3782				sin.sin_family = AF_INET;
3783				sin.sin_len = sizeof(struct sockaddr_in);
3784				sin.sin_port = port;
3785				m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3786				addr = (struct sockaddr *)&sin;
3787				break;
3788#endif
3789#ifdef INET6
3790			case SCTP_DSTADDRV6:
3791				if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in6_addr)) {
3792					*error = EINVAL;
3793					return (NULL);
3794				}
3795				memset(&sin6, 0, sizeof(struct sockaddr_in6));
3796				sin6.sin6_family = AF_INET6;
3797				sin6.sin6_len = sizeof(struct sockaddr_in6);
3798				sin6.sin6_port = port;
3799				m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3800#ifdef INET
3801				if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3802					in6_sin6_2_sin(&sin, &sin6);
3803					addr = (struct sockaddr *)&sin;
3804				} else
3805#endif
3806					addr = (struct sockaddr *)&sin6;
3807				break;
3808#endif
3809			default:
3810				addr = NULL;
3811				break;
3812			}
3813			if (addr) {
3814				stcb = sctp_findassociation_ep_addr(inp_p, addr, net_p, NULL, NULL);
3815				if (stcb != NULL) {
3816					return (stcb);
3817				}
3818			}
3819		}
3820		at += CMSG_ALIGN(cmh.cmsg_len);
3821	}
3822	return (NULL);
3823}
3824
3825static struct mbuf *
3826sctp_add_cookie(struct mbuf *init, int init_offset,
3827    struct mbuf *initack, int initack_offset, struct sctp_state_cookie *stc_in, uint8_t ** signature)
3828{
3829	struct mbuf *copy_init, *copy_initack, *m_at, *sig, *mret;
3830	struct sctp_state_cookie *stc;
3831	struct sctp_paramhdr *ph;
3832	uint8_t *foo;
3833	int sig_offset;
3834	uint16_t cookie_sz;
3835
3836	mret = sctp_get_mbuf_for_msg((sizeof(struct sctp_state_cookie) +
3837	    sizeof(struct sctp_paramhdr)), 0,
3838	    M_NOWAIT, 1, MT_DATA);
3839	if (mret == NULL) {
3840		return (NULL);
3841	}
3842	copy_init = SCTP_M_COPYM(init, init_offset, M_COPYALL, M_NOWAIT);
3843	if (copy_init == NULL) {
3844		sctp_m_freem(mret);
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_init, SCTP_MBUF_ICOPY);
3850	}
3851#endif
3852	copy_initack = SCTP_M_COPYM(initack, initack_offset, M_COPYALL,
3853	    M_NOWAIT);
3854	if (copy_initack == NULL) {
3855		sctp_m_freem(mret);
3856		sctp_m_freem(copy_init);
3857		return (NULL);
3858	}
3859#ifdef SCTP_MBUF_LOGGING
3860	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3861		sctp_log_mbc(copy_initack, SCTP_MBUF_ICOPY);
3862	}
3863#endif
3864	/* easy side we just drop it on the end */
3865	ph = mtod(mret, struct sctp_paramhdr *);
3866	SCTP_BUF_LEN(mret) = sizeof(struct sctp_state_cookie) +
3867	    sizeof(struct sctp_paramhdr);
3868	stc = (struct sctp_state_cookie *)((caddr_t)ph +
3869	    sizeof(struct sctp_paramhdr));
3870	ph->param_type = htons(SCTP_STATE_COOKIE);
3871	ph->param_length = 0;	/* fill in at the end */
3872	/* Fill in the stc cookie data */
3873	memcpy(stc, stc_in, sizeof(struct sctp_state_cookie));
3874
3875	/* tack the INIT and then the INIT-ACK onto the chain */
3876	cookie_sz = 0;
3877	for (m_at = mret; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3878		cookie_sz += SCTP_BUF_LEN(m_at);
3879		if (SCTP_BUF_NEXT(m_at) == NULL) {
3880			SCTP_BUF_NEXT(m_at) = copy_init;
3881			break;
3882		}
3883	}
3884	for (m_at = copy_init; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3885		cookie_sz += SCTP_BUF_LEN(m_at);
3886		if (SCTP_BUF_NEXT(m_at) == NULL) {
3887			SCTP_BUF_NEXT(m_at) = copy_initack;
3888			break;
3889		}
3890	}
3891	for (m_at = copy_initack; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3892		cookie_sz += SCTP_BUF_LEN(m_at);
3893		if (SCTP_BUF_NEXT(m_at) == NULL) {
3894			break;
3895		}
3896	}
3897	sig = sctp_get_mbuf_for_msg(SCTP_SECRET_SIZE, 0, M_NOWAIT, 1, MT_DATA);
3898	if (sig == NULL) {
3899		/* no space, so free the entire chain */
3900		sctp_m_freem(mret);
3901		return (NULL);
3902	}
3903	SCTP_BUF_LEN(sig) = 0;
3904	SCTP_BUF_NEXT(m_at) = sig;
3905	sig_offset = 0;
3906	foo = (uint8_t *) (mtod(sig, caddr_t)+sig_offset);
3907	memset(foo, 0, SCTP_SIGNATURE_SIZE);
3908	*signature = foo;
3909	SCTP_BUF_LEN(sig) += SCTP_SIGNATURE_SIZE;
3910	cookie_sz += SCTP_SIGNATURE_SIZE;
3911	ph->param_length = htons(cookie_sz);
3912	return (mret);
3913}
3914
3915
3916static uint8_t
3917sctp_get_ect(struct sctp_tcb *stcb)
3918{
3919	if ((stcb != NULL) && (stcb->asoc.ecn_supported == 1)) {
3920		return (SCTP_ECT0_BIT);
3921	} else {
3922		return (0);
3923	}
3924}
3925
3926#if defined(INET) || defined(INET6)
3927static void
3928sctp_handle_no_route(struct sctp_tcb *stcb,
3929    struct sctp_nets *net,
3930    int so_locked)
3931{
3932	SCTPDBG(SCTP_DEBUG_OUTPUT1, "dropped packet - no valid source addr\n");
3933
3934	if (net) {
3935		SCTPDBG(SCTP_DEBUG_OUTPUT1, "Destination was ");
3936		SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT1, &net->ro._l_addr.sa);
3937		if (net->dest_state & SCTP_ADDR_CONFIRMED) {
3938			if ((net->dest_state & SCTP_ADDR_REACHABLE) && stcb) {
3939				SCTPDBG(SCTP_DEBUG_OUTPUT1, "no route takes interface %p down\n", (void *)net);
3940				sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
3941				    stcb, 0,
3942				    (void *)net,
3943				    so_locked);
3944				net->dest_state &= ~SCTP_ADDR_REACHABLE;
3945				net->dest_state &= ~SCTP_ADDR_PF;
3946			}
3947		}
3948		if (stcb) {
3949			if (net == stcb->asoc.primary_destination) {
3950				/* need a new primary */
3951				struct sctp_nets *alt;
3952
3953				alt = sctp_find_alternate_net(stcb, net, 0);
3954				if (alt != net) {
3955					if (stcb->asoc.alternate) {
3956						sctp_free_remote_addr(stcb->asoc.alternate);
3957					}
3958					stcb->asoc.alternate = alt;
3959					atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
3960					if (net->ro._s_addr) {
3961						sctp_free_ifa(net->ro._s_addr);
3962						net->ro._s_addr = NULL;
3963					}
3964					net->src_addr_selected = 0;
3965				}
3966			}
3967		}
3968	}
3969}
3970
3971#endif
3972
3973static int
3974sctp_lowlevel_chunk_output(struct sctp_inpcb *inp,
3975    struct sctp_tcb *stcb,	/* may be NULL */
3976    struct sctp_nets *net,
3977    struct sockaddr *to,
3978    struct mbuf *m,
3979    uint32_t auth_offset,
3980    struct sctp_auth_chunk *auth,
3981    uint16_t auth_keyid,
3982    int nofragment_flag,
3983    int ecn_ok,
3984    int out_of_asoc_ok,
3985    uint16_t src_port,
3986    uint16_t dest_port,
3987    uint32_t v_tag,
3988    uint16_t port,
3989    union sctp_sockstore *over_addr,
3990    uint8_t mflowtype, uint32_t mflowid,
3991#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
3992    int so_locked SCTP_UNUSED
3993#else
3994    int so_locked
3995#endif
3996)
3997/* nofragment_flag to tell if IP_DF should be set (IPv4 only) */
3998{
3999	/**
4000	 * Given a mbuf chain (via SCTP_BUF_NEXT()) that holds a packet header
4001	 * WITH an SCTPHDR but no IP header, endpoint inp and sa structure:
4002	 * - fill in the HMAC digest of any AUTH chunk in the packet.
4003	 * - calculate and fill in the SCTP checksum.
4004	 * - prepend an IP address header.
4005	 * - if boundall use INADDR_ANY.
4006	 * - if boundspecific do source address selection.
4007	 * - set fragmentation option for ipV4.
4008	 * - On return from IP output, check/adjust mtu size of output
4009	 *   interface and smallest_mtu size as well.
4010	 */
4011	/* Will need ifdefs around this */
4012	struct mbuf *newm;
4013	struct sctphdr *sctphdr;
4014	int packet_length;
4015	int ret;
4016
4017#if defined(INET) || defined(INET6)
4018	uint32_t vrf_id;
4019
4020#endif
4021#if defined(INET) || defined(INET6)
4022	struct mbuf *o_pak;
4023	sctp_route_t *ro = NULL;
4024	struct udphdr *udp = NULL;
4025
4026#endif
4027	uint8_t tos_value;
4028
4029#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4030	struct socket *so = NULL;
4031
4032#endif
4033
4034	if ((net) && (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)) {
4035		SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4036		sctp_m_freem(m);
4037		return (EFAULT);
4038	}
4039#if defined(INET) || defined(INET6)
4040	if (stcb) {
4041		vrf_id = stcb->asoc.vrf_id;
4042	} else {
4043		vrf_id = inp->def_vrf_id;
4044	}
4045#endif
4046	/* fill in the HMAC digest for any AUTH chunk in the packet */
4047	if ((auth != NULL) && (stcb != NULL)) {
4048		sctp_fill_hmac_digest_m(m, auth_offset, auth, stcb, auth_keyid);
4049	}
4050	if (net) {
4051		tos_value = net->dscp;
4052	} else if (stcb) {
4053		tos_value = stcb->asoc.default_dscp;
4054	} else {
4055		tos_value = inp->sctp_ep.default_dscp;
4056	}
4057
4058	switch (to->sa_family) {
4059#ifdef INET
4060	case AF_INET:
4061		{
4062			struct ip *ip = NULL;
4063			sctp_route_t iproute;
4064			int len;
4065
4066			len = sizeof(struct ip) + sizeof(struct sctphdr);
4067			if (port) {
4068				len += sizeof(struct udphdr);
4069			}
4070			newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4071			if (newm == NULL) {
4072				sctp_m_freem(m);
4073				SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4074				return (ENOMEM);
4075			}
4076			SCTP_ALIGN_TO_END(newm, len);
4077			SCTP_BUF_LEN(newm) = len;
4078			SCTP_BUF_NEXT(newm) = m;
4079			m = newm;
4080			if (net != NULL) {
4081				m->m_pkthdr.flowid = net->flowid;
4082				M_HASHTYPE_SET(m, net->flowtype);
4083			} else {
4084				m->m_pkthdr.flowid = mflowid;
4085				M_HASHTYPE_SET(m, mflowtype);
4086			}
4087			packet_length = sctp_calculate_len(m);
4088			ip = mtod(m, struct ip *);
4089			ip->ip_v = IPVERSION;
4090			ip->ip_hl = (sizeof(struct ip) >> 2);
4091			if (tos_value == 0) {
4092				/*
4093				 * This means especially, that it is not set
4094				 * at the SCTP layer. So use the value from
4095				 * the IP layer.
4096				 */
4097				tos_value = inp->ip_inp.inp.inp_ip_tos;
4098			}
4099			tos_value &= 0xfc;
4100			if (ecn_ok) {
4101				tos_value |= sctp_get_ect(stcb);
4102			}
4103			if ((nofragment_flag) && (port == 0)) {
4104				ip->ip_off = htons(IP_DF);
4105			} else {
4106				ip->ip_off = htons(0);
4107			}
4108			/* FreeBSD has a function for ip_id's */
4109			ip->ip_id = ip_newid();
4110
4111			ip->ip_ttl = inp->ip_inp.inp.inp_ip_ttl;
4112			ip->ip_len = htons(packet_length);
4113			ip->ip_tos = tos_value;
4114			if (port) {
4115				ip->ip_p = IPPROTO_UDP;
4116			} else {
4117				ip->ip_p = IPPROTO_SCTP;
4118			}
4119			ip->ip_sum = 0;
4120			if (net == NULL) {
4121				ro = &iproute;
4122				memset(&iproute, 0, sizeof(iproute));
4123				memcpy(&ro->ro_dst, to, to->sa_len);
4124			} else {
4125				ro = (sctp_route_t *) & net->ro;
4126			}
4127			/* Now the address selection part */
4128			ip->ip_dst.s_addr = ((struct sockaddr_in *)to)->sin_addr.s_addr;
4129
4130			/* call the routine to select the src address */
4131			if (net && out_of_asoc_ok == 0) {
4132				if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4133					sctp_free_ifa(net->ro._s_addr);
4134					net->ro._s_addr = NULL;
4135					net->src_addr_selected = 0;
4136					if (ro->ro_rt) {
4137						RTFREE(ro->ro_rt);
4138						ro->ro_rt = NULL;
4139					}
4140				}
4141				if (net->src_addr_selected == 0) {
4142					/* Cache the source address */
4143					net->ro._s_addr = sctp_source_address_selection(inp, stcb,
4144					    ro, net, 0,
4145					    vrf_id);
4146					net->src_addr_selected = 1;
4147				}
4148				if (net->ro._s_addr == NULL) {
4149					/* No route to host */
4150					net->src_addr_selected = 0;
4151					sctp_handle_no_route(stcb, net, so_locked);
4152					SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4153					sctp_m_freem(m);
4154					return (EHOSTUNREACH);
4155				}
4156				ip->ip_src = net->ro._s_addr->address.sin.sin_addr;
4157			} else {
4158				if (over_addr == NULL) {
4159					struct sctp_ifa *_lsrc;
4160
4161					_lsrc = sctp_source_address_selection(inp, stcb, ro,
4162					    net,
4163					    out_of_asoc_ok,
4164					    vrf_id);
4165					if (_lsrc == NULL) {
4166						sctp_handle_no_route(stcb, net, so_locked);
4167						SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4168						sctp_m_freem(m);
4169						return (EHOSTUNREACH);
4170					}
4171					ip->ip_src = _lsrc->address.sin.sin_addr;
4172					sctp_free_ifa(_lsrc);
4173				} else {
4174					ip->ip_src = over_addr->sin.sin_addr;
4175					SCTP_RTALLOC(ro, vrf_id);
4176				}
4177			}
4178			if (port) {
4179				if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4180					sctp_handle_no_route(stcb, net, so_locked);
4181					SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4182					sctp_m_freem(m);
4183					return (EHOSTUNREACH);
4184				}
4185				udp = (struct udphdr *)((caddr_t)ip + sizeof(struct ip));
4186				udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4187				udp->uh_dport = port;
4188				udp->uh_ulen = htons(packet_length - sizeof(struct ip));
4189				if (V_udp_cksum) {
4190					udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
4191				} else {
4192					udp->uh_sum = 0;
4193				}
4194				sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4195			} else {
4196				sctphdr = (struct sctphdr *)((caddr_t)ip + sizeof(struct ip));
4197			}
4198
4199			sctphdr->src_port = src_port;
4200			sctphdr->dest_port = dest_port;
4201			sctphdr->v_tag = v_tag;
4202			sctphdr->checksum = 0;
4203
4204			/*
4205			 * If source address selection fails and we find no
4206			 * route then the ip_output should fail as well with
4207			 * a NO_ROUTE_TO_HOST type error. We probably should
4208			 * catch that somewhere and abort the association
4209			 * right away (assuming this is an INIT being sent).
4210			 */
4211			if (ro->ro_rt == NULL) {
4212				/*
4213				 * src addr selection failed to find a route
4214				 * (or valid source addr), so we can't get
4215				 * there from here (yet)!
4216				 */
4217				sctp_handle_no_route(stcb, net, so_locked);
4218				SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4219				sctp_m_freem(m);
4220				return (EHOSTUNREACH);
4221			}
4222			if (ro != &iproute) {
4223				memcpy(&iproute, ro, sizeof(*ro));
4224			}
4225			SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv4 output routine from low level src addr:%x\n",
4226			    (uint32_t) (ntohl(ip->ip_src.s_addr)));
4227			SCTPDBG(SCTP_DEBUG_OUTPUT3, "Destination is %x\n",
4228			    (uint32_t) (ntohl(ip->ip_dst.s_addr)));
4229			SCTPDBG(SCTP_DEBUG_OUTPUT3, "RTP route is %p through\n",
4230			    (void *)ro->ro_rt);
4231
4232			if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4233				/* failed to prepend data, give up */
4234				SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4235				sctp_m_freem(m);
4236				return (ENOMEM);
4237			}
4238			SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4239			if (port) {
4240#if defined(SCTP_WITH_NO_CSUM)
4241				SCTP_STAT_INCR(sctps_sendnocrc);
4242#else
4243				sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip) + sizeof(struct udphdr));
4244				SCTP_STAT_INCR(sctps_sendswcrc);
4245#endif
4246				if (V_udp_cksum) {
4247					SCTP_ENABLE_UDP_CSUM(o_pak);
4248				}
4249			} else {
4250#if defined(SCTP_WITH_NO_CSUM)
4251				SCTP_STAT_INCR(sctps_sendnocrc);
4252#else
4253				m->m_pkthdr.csum_flags = CSUM_SCTP;
4254				m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4255				SCTP_STAT_INCR(sctps_sendhwcrc);
4256#endif
4257			}
4258#ifdef SCTP_PACKET_LOGGING
4259			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4260				sctp_packet_log(o_pak);
4261#endif
4262			/* send it out.  table id is taken from stcb */
4263#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4264			if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4265				so = SCTP_INP_SO(inp);
4266				SCTP_SOCKET_UNLOCK(so, 0);
4267			}
4268#endif
4269			SCTP_IP_OUTPUT(ret, o_pak, ro, stcb, vrf_id);
4270#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4271			if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4272				atomic_add_int(&stcb->asoc.refcnt, 1);
4273				SCTP_TCB_UNLOCK(stcb);
4274				SCTP_SOCKET_LOCK(so, 0);
4275				SCTP_TCB_LOCK(stcb);
4276				atomic_subtract_int(&stcb->asoc.refcnt, 1);
4277			}
4278#endif
4279			SCTP_STAT_INCR(sctps_sendpackets);
4280			SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4281			if (ret)
4282				SCTP_STAT_INCR(sctps_senderrors);
4283
4284			SCTPDBG(SCTP_DEBUG_OUTPUT3, "IP output returns %d\n", ret);
4285			if (net == NULL) {
4286				/* free tempy routes */
4287				RO_RTFREE(ro);
4288			} else {
4289				/*
4290				 * PMTU check versus smallest asoc MTU goes
4291				 * here
4292				 */
4293				if ((ro->ro_rt != NULL) &&
4294				    (net->ro._s_addr)) {
4295					uint32_t mtu;
4296
4297					mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4298					if (net->port) {
4299						mtu -= sizeof(struct udphdr);
4300					}
4301					if (mtu && (stcb->asoc.smallest_mtu > mtu)) {
4302						sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4303						net->mtu = mtu;
4304					}
4305				} else if (ro->ro_rt == NULL) {
4306					/* route was freed */
4307					if (net->ro._s_addr &&
4308					    net->src_addr_selected) {
4309						sctp_free_ifa(net->ro._s_addr);
4310						net->ro._s_addr = NULL;
4311					}
4312					net->src_addr_selected = 0;
4313				}
4314			}
4315			return (ret);
4316		}
4317#endif
4318#ifdef INET6
4319	case AF_INET6:
4320		{
4321			uint32_t flowlabel, flowinfo;
4322			struct ip6_hdr *ip6h;
4323			struct route_in6 ip6route;
4324			struct ifnet *ifp;
4325			struct sockaddr_in6 *sin6, tmp, *lsa6, lsa6_tmp;
4326			int prev_scope = 0;
4327			struct sockaddr_in6 lsa6_storage;
4328			int error;
4329			u_short prev_port = 0;
4330			int len;
4331
4332			if (net) {
4333				flowlabel = net->flowlabel;
4334			} else if (stcb) {
4335				flowlabel = stcb->asoc.default_flowlabel;
4336			} else {
4337				flowlabel = inp->sctp_ep.default_flowlabel;
4338			}
4339			if (flowlabel == 0) {
4340				/*
4341				 * This means especially, that it is not set
4342				 * at the SCTP layer. So use the value from
4343				 * the IP layer.
4344				 */
4345				flowlabel = ntohl(((struct in6pcb *)inp)->in6p_flowinfo);
4346			}
4347			flowlabel &= 0x000fffff;
4348			len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr);
4349			if (port) {
4350				len += sizeof(struct udphdr);
4351			}
4352			newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4353			if (newm == NULL) {
4354				sctp_m_freem(m);
4355				SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4356				return (ENOMEM);
4357			}
4358			SCTP_ALIGN_TO_END(newm, len);
4359			SCTP_BUF_LEN(newm) = len;
4360			SCTP_BUF_NEXT(newm) = m;
4361			m = newm;
4362			if (net != NULL) {
4363				m->m_pkthdr.flowid = net->flowid;
4364				M_HASHTYPE_SET(m, net->flowtype);
4365			} else {
4366				m->m_pkthdr.flowid = mflowid;
4367				M_HASHTYPE_SET(m, mflowtype);
4368			}
4369			packet_length = sctp_calculate_len(m);
4370
4371			ip6h = mtod(m, struct ip6_hdr *);
4372			/* protect *sin6 from overwrite */
4373			sin6 = (struct sockaddr_in6 *)to;
4374			tmp = *sin6;
4375			sin6 = &tmp;
4376
4377			/* KAME hack: embed scopeid */
4378			if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4379				SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4380				return (EINVAL);
4381			}
4382			if (net == NULL) {
4383				memset(&ip6route, 0, sizeof(ip6route));
4384				ro = (sctp_route_t *) & ip6route;
4385				memcpy(&ro->ro_dst, sin6, sin6->sin6_len);
4386			} else {
4387				ro = (sctp_route_t *) & net->ro;
4388			}
4389			/*
4390			 * We assume here that inp_flow is in host byte
4391			 * order within the TCB!
4392			 */
4393			if (tos_value == 0) {
4394				/*
4395				 * This means especially, that it is not set
4396				 * at the SCTP layer. So use the value from
4397				 * the IP layer.
4398				 */
4399				tos_value = (ntohl(((struct in6pcb *)inp)->in6p_flowinfo) >> 20) & 0xff;
4400			}
4401			tos_value &= 0xfc;
4402			if (ecn_ok) {
4403				tos_value |= sctp_get_ect(stcb);
4404			}
4405			flowinfo = 0x06;
4406			flowinfo <<= 8;
4407			flowinfo |= tos_value;
4408			flowinfo <<= 20;
4409			flowinfo |= flowlabel;
4410			ip6h->ip6_flow = htonl(flowinfo);
4411			if (port) {
4412				ip6h->ip6_nxt = IPPROTO_UDP;
4413			} else {
4414				ip6h->ip6_nxt = IPPROTO_SCTP;
4415			}
4416			ip6h->ip6_plen = (packet_length - sizeof(struct ip6_hdr));
4417			ip6h->ip6_dst = sin6->sin6_addr;
4418
4419			/*
4420			 * Add SRC address selection here: we can only reuse
4421			 * to a limited degree the kame src-addr-sel, since
4422			 * we can try their selection but it may not be
4423			 * bound.
4424			 */
4425			bzero(&lsa6_tmp, sizeof(lsa6_tmp));
4426			lsa6_tmp.sin6_family = AF_INET6;
4427			lsa6_tmp.sin6_len = sizeof(lsa6_tmp);
4428			lsa6 = &lsa6_tmp;
4429			if (net && out_of_asoc_ok == 0) {
4430				if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4431					sctp_free_ifa(net->ro._s_addr);
4432					net->ro._s_addr = NULL;
4433					net->src_addr_selected = 0;
4434					if (ro->ro_rt) {
4435						RTFREE(ro->ro_rt);
4436						ro->ro_rt = NULL;
4437					}
4438				}
4439				if (net->src_addr_selected == 0) {
4440					sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4441					/* KAME hack: embed scopeid */
4442					if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4443						SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4444						return (EINVAL);
4445					}
4446					/* Cache the source address */
4447					net->ro._s_addr = sctp_source_address_selection(inp,
4448					    stcb,
4449					    ro,
4450					    net,
4451					    0,
4452					    vrf_id);
4453					(void)sa6_recoverscope(sin6);
4454					net->src_addr_selected = 1;
4455				}
4456				if (net->ro._s_addr == NULL) {
4457					SCTPDBG(SCTP_DEBUG_OUTPUT3, "V6:No route to host\n");
4458					net->src_addr_selected = 0;
4459					sctp_handle_no_route(stcb, net, so_locked);
4460					SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4461					sctp_m_freem(m);
4462					return (EHOSTUNREACH);
4463				}
4464				lsa6->sin6_addr = net->ro._s_addr->address.sin6.sin6_addr;
4465			} else {
4466				sin6 = (struct sockaddr_in6 *)&ro->ro_dst;
4467				/* KAME hack: embed scopeid */
4468				if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4469					SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4470					return (EINVAL);
4471				}
4472				if (over_addr == NULL) {
4473					struct sctp_ifa *_lsrc;
4474
4475					_lsrc = sctp_source_address_selection(inp, stcb, ro,
4476					    net,
4477					    out_of_asoc_ok,
4478					    vrf_id);
4479					if (_lsrc == NULL) {
4480						sctp_handle_no_route(stcb, net, so_locked);
4481						SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4482						sctp_m_freem(m);
4483						return (EHOSTUNREACH);
4484					}
4485					lsa6->sin6_addr = _lsrc->address.sin6.sin6_addr;
4486					sctp_free_ifa(_lsrc);
4487				} else {
4488					lsa6->sin6_addr = over_addr->sin6.sin6_addr;
4489					SCTP_RTALLOC(ro, vrf_id);
4490				}
4491				(void)sa6_recoverscope(sin6);
4492			}
4493			lsa6->sin6_port = inp->sctp_lport;
4494
4495			if (ro->ro_rt == NULL) {
4496				/*
4497				 * src addr selection failed to find a route
4498				 * (or valid source addr), so we can't get
4499				 * there from here!
4500				 */
4501				sctp_handle_no_route(stcb, net, so_locked);
4502				SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4503				sctp_m_freem(m);
4504				return (EHOSTUNREACH);
4505			}
4506			/*
4507			 * XXX: sa6 may not have a valid sin6_scope_id in
4508			 * the non-SCOPEDROUTING case.
4509			 */
4510			bzero(&lsa6_storage, sizeof(lsa6_storage));
4511			lsa6_storage.sin6_family = AF_INET6;
4512			lsa6_storage.sin6_len = sizeof(lsa6_storage);
4513			lsa6_storage.sin6_addr = lsa6->sin6_addr;
4514			if ((error = sa6_recoverscope(&lsa6_storage)) != 0) {
4515				SCTPDBG(SCTP_DEBUG_OUTPUT3, "recover scope fails error %d\n", error);
4516				sctp_m_freem(m);
4517				return (error);
4518			}
4519			/* XXX */
4520			lsa6_storage.sin6_addr = lsa6->sin6_addr;
4521			lsa6_storage.sin6_port = inp->sctp_lport;
4522			lsa6 = &lsa6_storage;
4523			ip6h->ip6_src = lsa6->sin6_addr;
4524
4525			if (port) {
4526				if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4527					sctp_handle_no_route(stcb, net, so_locked);
4528					SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4529					sctp_m_freem(m);
4530					return (EHOSTUNREACH);
4531				}
4532				udp = (struct udphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4533				udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4534				udp->uh_dport = port;
4535				udp->uh_ulen = htons(packet_length - sizeof(struct ip6_hdr));
4536				udp->uh_sum = 0;
4537				sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4538			} else {
4539				sctphdr = (struct sctphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4540			}
4541
4542			sctphdr->src_port = src_port;
4543			sctphdr->dest_port = dest_port;
4544			sctphdr->v_tag = v_tag;
4545			sctphdr->checksum = 0;
4546
4547			/*
4548			 * We set the hop limit now since there is a good
4549			 * chance that our ro pointer is now filled
4550			 */
4551			ip6h->ip6_hlim = SCTP_GET_HLIM(inp, ro);
4552			ifp = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
4553
4554#ifdef SCTP_DEBUG
4555			/* Copy to be sure something bad is not happening */
4556			sin6->sin6_addr = ip6h->ip6_dst;
4557			lsa6->sin6_addr = ip6h->ip6_src;
4558#endif
4559
4560			SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv6 output routine from low level\n");
4561			SCTPDBG(SCTP_DEBUG_OUTPUT3, "src: ");
4562			SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)lsa6);
4563			SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst: ");
4564			SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)sin6);
4565			if (net) {
4566				sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4567				/*
4568				 * preserve the port and scope for link
4569				 * local send
4570				 */
4571				prev_scope = sin6->sin6_scope_id;
4572				prev_port = sin6->sin6_port;
4573			}
4574			if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4575				/* failed to prepend data, give up */
4576				sctp_m_freem(m);
4577				SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4578				return (ENOMEM);
4579			}
4580			SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4581			if (port) {
4582#if defined(SCTP_WITH_NO_CSUM)
4583				SCTP_STAT_INCR(sctps_sendnocrc);
4584#else
4585				sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
4586				SCTP_STAT_INCR(sctps_sendswcrc);
4587#endif
4588				if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), packet_length - sizeof(struct ip6_hdr))) == 0) {
4589					udp->uh_sum = 0xffff;
4590				}
4591			} else {
4592#if defined(SCTP_WITH_NO_CSUM)
4593				SCTP_STAT_INCR(sctps_sendnocrc);
4594#else
4595				m->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
4596				m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4597				SCTP_STAT_INCR(sctps_sendhwcrc);
4598#endif
4599			}
4600			/* send it out. table id is taken from stcb */
4601#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4602			if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4603				so = SCTP_INP_SO(inp);
4604				SCTP_SOCKET_UNLOCK(so, 0);
4605			}
4606#endif
4607#ifdef SCTP_PACKET_LOGGING
4608			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4609				sctp_packet_log(o_pak);
4610#endif
4611			SCTP_IP6_OUTPUT(ret, o_pak, (struct route_in6 *)ro, &ifp, stcb, vrf_id);
4612#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4613			if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4614				atomic_add_int(&stcb->asoc.refcnt, 1);
4615				SCTP_TCB_UNLOCK(stcb);
4616				SCTP_SOCKET_LOCK(so, 0);
4617				SCTP_TCB_LOCK(stcb);
4618				atomic_subtract_int(&stcb->asoc.refcnt, 1);
4619			}
4620#endif
4621			if (net) {
4622				/* for link local this must be done */
4623				sin6->sin6_scope_id = prev_scope;
4624				sin6->sin6_port = prev_port;
4625			}
4626			SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
4627			SCTP_STAT_INCR(sctps_sendpackets);
4628			SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4629			if (ret) {
4630				SCTP_STAT_INCR(sctps_senderrors);
4631			}
4632			if (net == NULL) {
4633				/* Now if we had a temp route free it */
4634				RO_RTFREE(ro);
4635			} else {
4636				/*
4637				 * PMTU check versus smallest asoc MTU goes
4638				 * here
4639				 */
4640				if (ro->ro_rt == NULL) {
4641					/* Route was freed */
4642					if (net->ro._s_addr &&
4643					    net->src_addr_selected) {
4644						sctp_free_ifa(net->ro._s_addr);
4645						net->ro._s_addr = NULL;
4646					}
4647					net->src_addr_selected = 0;
4648				}
4649				if ((ro->ro_rt != NULL) &&
4650				    (net->ro._s_addr)) {
4651					uint32_t mtu;
4652
4653					mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4654					if (mtu &&
4655					    (stcb->asoc.smallest_mtu > mtu)) {
4656						sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4657						net->mtu = mtu;
4658						if (net->port) {
4659							net->mtu -= sizeof(struct udphdr);
4660						}
4661					}
4662				} else if (ifp) {
4663					if (ND_IFINFO(ifp)->linkmtu &&
4664					    (stcb->asoc.smallest_mtu > ND_IFINFO(ifp)->linkmtu)) {
4665						sctp_mtu_size_reset(inp,
4666						    &stcb->asoc,
4667						    ND_IFINFO(ifp)->linkmtu);
4668					}
4669				}
4670			}
4671			return (ret);
4672		}
4673#endif
4674	default:
4675		SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
4676		    ((struct sockaddr *)to)->sa_family);
4677		sctp_m_freem(m);
4678		SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4679		return (EFAULT);
4680	}
4681}
4682
4683
4684void
4685sctp_send_initiate(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int so_locked
4686#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
4687    SCTP_UNUSED
4688#endif
4689)
4690{
4691	struct mbuf *m, *m_last;
4692	struct sctp_nets *net;
4693	struct sctp_init_chunk *init;
4694	struct sctp_supported_addr_param *sup_addr;
4695	struct sctp_adaptation_layer_indication *ali;
4696	struct sctp_supported_chunk_types_param *pr_supported;
4697	struct sctp_paramhdr *ph;
4698	int cnt_inits_to = 0;
4699	int ret;
4700	uint16_t num_ext, chunk_len, padding_len, parameter_len;
4701
4702	/* INIT's always go to the primary (and usually ONLY address) */
4703	net = stcb->asoc.primary_destination;
4704	if (net == NULL) {
4705		net = TAILQ_FIRST(&stcb->asoc.nets);
4706		if (net == NULL) {
4707			/* TSNH */
4708			return;
4709		}
4710		/* we confirm any address we send an INIT to */
4711		net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4712		(void)sctp_set_primary_addr(stcb, NULL, net);
4713	} else {
4714		/* we confirm any address we send an INIT to */
4715		net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4716	}
4717	SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
4718#ifdef INET6
4719	if (net->ro._l_addr.sa.sa_family == AF_INET6) {
4720		/*
4721		 * special hook, if we are sending to link local it will not
4722		 * show up in our private address count.
4723		 */
4724		if (IN6_IS_ADDR_LINKLOCAL(&net->ro._l_addr.sin6.sin6_addr))
4725			cnt_inits_to = 1;
4726	}
4727#endif
4728	if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4729		/* This case should not happen */
4730		SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
4731		return;
4732	}
4733	/* start the INIT timer */
4734	sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
4735
4736	m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_NOWAIT, 1, MT_DATA);
4737	if (m == NULL) {
4738		/* No memory, INIT timer will re-attempt. */
4739		SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
4740		return;
4741	}
4742	chunk_len = (uint16_t) sizeof(struct sctp_init_chunk);
4743	padding_len = 0;
4744	/* Now lets put the chunk header in place */
4745	init = mtod(m, struct sctp_init_chunk *);
4746	/* now the chunk header */
4747	init->ch.chunk_type = SCTP_INITIATION;
4748	init->ch.chunk_flags = 0;
4749	/* fill in later from mbuf we build */
4750	init->ch.chunk_length = 0;
4751	/* place in my tag */
4752	init->init.initiate_tag = htonl(stcb->asoc.my_vtag);
4753	/* set up some of the credits. */
4754	init->init.a_rwnd = htonl(max(inp->sctp_socket ? SCTP_SB_LIMIT_RCV(inp->sctp_socket) : 0,
4755	    SCTP_MINIMAL_RWND));
4756	init->init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
4757	init->init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
4758	init->init.initial_tsn = htonl(stcb->asoc.init_seq_number);
4759
4760	/* Adaptation layer indication parameter */
4761	if (inp->sctp_ep.adaptation_layer_indicator_provided) {
4762		parameter_len = (uint16_t) sizeof(struct sctp_adaptation_layer_indication);
4763		ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
4764		ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
4765		ali->ph.param_length = htons(parameter_len);
4766		ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
4767		chunk_len += parameter_len;
4768	}
4769	/* ECN parameter */
4770	if (stcb->asoc.ecn_supported == 1) {
4771		parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4772		ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4773		ph->param_type = htons(SCTP_ECN_CAPABLE);
4774		ph->param_length = htons(parameter_len);
4775		chunk_len += parameter_len;
4776	}
4777	/* PR-SCTP supported parameter */
4778	if (stcb->asoc.prsctp_supported == 1) {
4779		parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4780		ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4781		ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
4782		ph->param_length = htons(parameter_len);
4783		chunk_len += parameter_len;
4784	}
4785	/* Add NAT friendly parameter. */
4786	if (SCTP_BASE_SYSCTL(sctp_inits_include_nat_friendly)) {
4787		parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4788		ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4789		ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
4790		ph->param_length = htons(parameter_len);
4791		chunk_len += parameter_len;
4792	}
4793	/* And now tell the peer which extensions we support */
4794	num_ext = 0;
4795	pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
4796	if (stcb->asoc.prsctp_supported == 1) {
4797		pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
4798	}
4799	if (stcb->asoc.auth_supported == 1) {
4800		pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
4801	}
4802	if (stcb->asoc.asconf_supported == 1) {
4803		pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
4804		pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
4805	}
4806	if (stcb->asoc.reconfig_supported == 1) {
4807		pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
4808	}
4809	if (stcb->asoc.nrsack_supported == 1) {
4810		pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
4811	}
4812	if (stcb->asoc.pktdrop_supported == 1) {
4813		pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
4814	}
4815	if (num_ext > 0) {
4816		parameter_len = (uint16_t) sizeof(struct sctp_supported_chunk_types_param) + num_ext;
4817		pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
4818		pr_supported->ph.param_length = htons(parameter_len);
4819		padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4820		chunk_len += parameter_len;
4821	}
4822	/* add authentication parameters */
4823	if (stcb->asoc.auth_supported) {
4824		/* attach RANDOM parameter, if available */
4825		if (stcb->asoc.authinfo.random != NULL) {
4826			struct sctp_auth_random *randp;
4827
4828			if (padding_len > 0) {
4829				memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4830				chunk_len += padding_len;
4831				padding_len = 0;
4832			}
4833			randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
4834			parameter_len = (uint16_t) sizeof(struct sctp_auth_random) + stcb->asoc.authinfo.random_len;
4835			/* random key already contains the header */
4836			memcpy(randp, stcb->asoc.authinfo.random->key, parameter_len);
4837			padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4838			chunk_len += parameter_len;
4839		}
4840		/* add HMAC_ALGO parameter */
4841		if (stcb->asoc.local_hmacs != NULL) {
4842			struct sctp_auth_hmac_algo *hmacs;
4843
4844			if (padding_len > 0) {
4845				memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4846				chunk_len += padding_len;
4847				padding_len = 0;
4848			}
4849			hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
4850			parameter_len = (uint16_t) (sizeof(struct sctp_auth_hmac_algo) +
4851			    stcb->asoc.local_hmacs->num_algo * sizeof(uint16_t));
4852			hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
4853			hmacs->ph.param_length = htons(parameter_len);
4854			sctp_serialize_hmaclist(stcb->asoc.local_hmacs, (uint8_t *) hmacs->hmac_ids);
4855			padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4856			chunk_len += parameter_len;
4857		}
4858		/* add CHUNKS parameter */
4859		if (stcb->asoc.local_auth_chunks != NULL) {
4860			struct sctp_auth_chunk_list *chunks;
4861
4862			if (padding_len > 0) {
4863				memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4864				chunk_len += padding_len;
4865				padding_len = 0;
4866			}
4867			chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
4868			parameter_len = (uint16_t) (sizeof(struct sctp_auth_chunk_list) +
4869			    sctp_auth_get_chklist_size(stcb->asoc.local_auth_chunks));
4870			chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
4871			chunks->ph.param_length = htons(parameter_len);
4872			sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks, chunks->chunk_types);
4873			padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4874			chunk_len += parameter_len;
4875		}
4876	}
4877	/* now any cookie time extensions */
4878	if (stcb->asoc.cookie_preserve_req) {
4879		struct sctp_cookie_perserve_param *cookie_preserve;
4880
4881		if (padding_len > 0) {
4882			memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4883			chunk_len += padding_len;
4884			padding_len = 0;
4885		}
4886		parameter_len = (uint16_t) sizeof(struct sctp_cookie_perserve_param);
4887		cookie_preserve = (struct sctp_cookie_perserve_param *)(mtod(m, caddr_t)+chunk_len);
4888		cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
4889		cookie_preserve->ph.param_length = htons(parameter_len);
4890		cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
4891		stcb->asoc.cookie_preserve_req = 0;
4892		chunk_len += parameter_len;
4893	}
4894	if (stcb->asoc.scope.ipv4_addr_legal || stcb->asoc.scope.ipv6_addr_legal) {
4895		uint8_t i;
4896
4897		if (padding_len > 0) {
4898			memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4899			chunk_len += padding_len;
4900			padding_len = 0;
4901		}
4902		parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4903		if (stcb->asoc.scope.ipv4_addr_legal) {
4904			parameter_len += (uint16_t) sizeof(uint16_t);
4905		}
4906		if (stcb->asoc.scope.ipv6_addr_legal) {
4907			parameter_len += (uint16_t) sizeof(uint16_t);
4908		}
4909		sup_addr = (struct sctp_supported_addr_param *)(mtod(m, caddr_t)+chunk_len);
4910		sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
4911		sup_addr->ph.param_length = htons(parameter_len);
4912		i = 0;
4913		if (stcb->asoc.scope.ipv4_addr_legal) {
4914			sup_addr->addr_type[i++] = htons(SCTP_IPV4_ADDRESS);
4915		}
4916		if (stcb->asoc.scope.ipv6_addr_legal) {
4917			sup_addr->addr_type[i++] = htons(SCTP_IPV6_ADDRESS);
4918		}
4919		padding_len = 4 - 2 * i;
4920		chunk_len += parameter_len;
4921	}
4922	SCTP_BUF_LEN(m) = chunk_len;
4923	/* now the addresses */
4924	/*
4925	 * To optimize this we could put the scoping stuff into a structure
4926	 * and remove the individual uint8's from the assoc structure. Then
4927	 * we could just sifa in the address within the stcb. But for now
4928	 * this is a quick hack to get the address stuff teased apart.
4929	 */
4930	m_last = sctp_add_addresses_to_i_ia(inp, stcb, &stcb->asoc.scope,
4931	    m, cnt_inits_to,
4932	    &padding_len, &chunk_len);
4933
4934	init->ch.chunk_length = htons(chunk_len);
4935	if (padding_len > 0) {
4936		if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
4937			sctp_m_freem(m);
4938			return;
4939		}
4940	}
4941	SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - calls lowlevel_output\n");
4942	ret = sctp_lowlevel_chunk_output(inp, stcb, net,
4943	    (struct sockaddr *)&net->ro._l_addr,
4944	    m, 0, NULL, 0, 0, 0, 0,
4945	    inp->sctp_lport, stcb->rport, htonl(0),
4946	    net->port, NULL,
4947	    0, 0,
4948	    so_locked);
4949	SCTPDBG(SCTP_DEBUG_OUTPUT4, "lowlevel_output - %d\n", ret);
4950	SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
4951	(void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
4952}
4953
4954struct mbuf *
4955sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
4956    int param_offset, int *abort_processing, struct sctp_chunkhdr *cp, int *nat_friendly)
4957{
4958	/*
4959	 * Given a mbuf containing an INIT or INIT-ACK with the param_offset
4960	 * being equal to the beginning of the params i.e. (iphlen +
4961	 * sizeof(struct sctp_init_msg) parse through the parameters to the
4962	 * end of the mbuf verifying that all parameters are known.
4963	 *
4964	 * For unknown parameters build and return a mbuf with
4965	 * UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
4966	 * processing this chunk stop, and set *abort_processing to 1.
4967	 *
4968	 * By having param_offset be pre-set to where parameters begin it is
4969	 * hoped that this routine may be reused in the future by new
4970	 * features.
4971	 */
4972	struct sctp_paramhdr *phdr, params;
4973
4974	struct mbuf *mat, *op_err;
4975	char tempbuf[SCTP_PARAM_BUFFER_SIZE];
4976	int at, limit, pad_needed;
4977	uint16_t ptype, plen, padded_size;
4978	int err_at;
4979
4980	*abort_processing = 0;
4981	mat = in_initpkt;
4982	err_at = 0;
4983	limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
4984	at = param_offset;
4985	op_err = NULL;
4986	SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
4987	phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
4988	while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
4989		ptype = ntohs(phdr->param_type);
4990		plen = ntohs(phdr->param_length);
4991		if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
4992			/* wacked parameter */
4993			SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
4994			goto invalid_size;
4995		}
4996		limit -= SCTP_SIZE32(plen);
4997		/*-
4998		 * All parameters for all chunks that we know/understand are
4999		 * listed here. We process them other places and make
5000		 * appropriate stop actions per the upper bits. However this
5001		 * is the generic routine processor's can call to get back
5002		 * an operr.. to either incorporate (init-ack) or send.
5003		 */
5004		padded_size = SCTP_SIZE32(plen);
5005		switch (ptype) {
5006			/* Param's with variable size */
5007		case SCTP_HEARTBEAT_INFO:
5008		case SCTP_STATE_COOKIE:
5009		case SCTP_UNRECOG_PARAM:
5010		case SCTP_ERROR_CAUSE_IND:
5011			/* ok skip fwd */
5012			at += padded_size;
5013			break;
5014			/* Param's with variable size within a range */
5015		case SCTP_CHUNK_LIST:
5016		case SCTP_SUPPORTED_CHUNK_EXT:
5017			if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
5018				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
5019				goto invalid_size;
5020			}
5021			at += padded_size;
5022			break;
5023		case SCTP_SUPPORTED_ADDRTYPE:
5024			if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
5025				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
5026				goto invalid_size;
5027			}
5028			at += padded_size;
5029			break;
5030		case SCTP_RANDOM:
5031			if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
5032				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
5033				goto invalid_size;
5034			}
5035			at += padded_size;
5036			break;
5037		case SCTP_SET_PRIM_ADDR:
5038		case SCTP_DEL_IP_ADDRESS:
5039		case SCTP_ADD_IP_ADDRESS:
5040			if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
5041			    (padded_size != sizeof(struct sctp_asconf_addr_param))) {
5042				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
5043				goto invalid_size;
5044			}
5045			at += padded_size;
5046			break;
5047			/* Param's with a fixed size */
5048		case SCTP_IPV4_ADDRESS:
5049			if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
5050				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
5051				goto invalid_size;
5052			}
5053			at += padded_size;
5054			break;
5055		case SCTP_IPV6_ADDRESS:
5056			if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
5057				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
5058				goto invalid_size;
5059			}
5060			at += padded_size;
5061			break;
5062		case SCTP_COOKIE_PRESERVE:
5063			if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
5064				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
5065				goto invalid_size;
5066			}
5067			at += padded_size;
5068			break;
5069		case SCTP_HAS_NAT_SUPPORT:
5070			*nat_friendly = 1;
5071			/* fall through */
5072		case SCTP_PRSCTP_SUPPORTED:
5073			if (padded_size != sizeof(struct sctp_paramhdr)) {
5074				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error prsctp/nat support %d\n", plen);
5075				goto invalid_size;
5076			}
5077			at += padded_size;
5078			break;
5079		case SCTP_ECN_CAPABLE:
5080			if (padded_size != sizeof(struct sctp_paramhdr)) {
5081				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
5082				goto invalid_size;
5083			}
5084			at += padded_size;
5085			break;
5086		case SCTP_ULP_ADAPTATION:
5087			if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
5088				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
5089				goto invalid_size;
5090			}
5091			at += padded_size;
5092			break;
5093		case SCTP_SUCCESS_REPORT:
5094			if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
5095				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
5096				goto invalid_size;
5097			}
5098			at += padded_size;
5099			break;
5100		case SCTP_HOSTNAME_ADDRESS:
5101			{
5102				/* We can NOT handle HOST NAME addresses!! */
5103				int l_len;
5104
5105				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
5106				*abort_processing = 1;
5107				if (op_err == NULL) {
5108					/* Ok need to try to get a mbuf */
5109#ifdef INET6
5110					l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5111#else
5112					l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5113#endif
5114					l_len += plen;
5115					l_len += sizeof(struct sctp_paramhdr);
5116					op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5117					if (op_err) {
5118						SCTP_BUF_LEN(op_err) = 0;
5119						/*
5120						 * pre-reserve space for ip
5121						 * and sctp header  and
5122						 * chunk hdr
5123						 */
5124#ifdef INET6
5125						SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5126#else
5127						SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5128#endif
5129						SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5130						SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5131					}
5132				}
5133				if (op_err) {
5134					/* If we have space */
5135					struct sctp_paramhdr s;
5136
5137					if (err_at % 4) {
5138						uint32_t cpthis = 0;
5139
5140						pad_needed = 4 - (err_at % 4);
5141						m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5142						err_at += pad_needed;
5143					}
5144					s.param_type = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
5145					s.param_length = htons(sizeof(s) + plen);
5146					m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5147					err_at += sizeof(s);
5148					phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
5149					if (phdr == NULL) {
5150						sctp_m_freem(op_err);
5151						/*
5152						 * we are out of memory but
5153						 * we still need to have a
5154						 * look at what to do (the
5155						 * system is in trouble
5156						 * though).
5157						 */
5158						return (NULL);
5159					}
5160					m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5161				}
5162				return (op_err);
5163				break;
5164			}
5165		default:
5166			/*
5167			 * we do not recognize the parameter figure out what
5168			 * we do.
5169			 */
5170			SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
5171			if ((ptype & 0x4000) == 0x4000) {
5172				/* Report bit is set?? */
5173				SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
5174				if (op_err == NULL) {
5175					int l_len;
5176
5177					/* Ok need to try to get an mbuf */
5178#ifdef INET6
5179					l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5180#else
5181					l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5182#endif
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, min(sizeof(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
5253#ifdef INET6
5254		l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5255#else
5256		l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5257#endif
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
5309#ifdef INET
5310	struct sockaddr_in sin4, *sa4;
5311
5312#endif
5313#ifdef INET6
5314	struct sockaddr_in6 sin6, *sa6;
5315
5316#endif
5317
5318#ifdef INET
5319	memset(&sin4, 0, sizeof(sin4));
5320	sin4.sin_family = AF_INET;
5321	sin4.sin_len = sizeof(sin4);
5322#endif
5323#ifdef INET6
5324	memset(&sin6, 0, sizeof(sin6));
5325	sin6.sin6_family = AF_INET6;
5326	sin6.sin6_len = sizeof(sin6);
5327#endif
5328	/* First what about the src address of the pkt ? */
5329	fnd = 0;
5330	TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5331		sa = (struct sockaddr *)&net->ro._l_addr;
5332		if (sa->sa_family == src->sa_family) {
5333#ifdef INET
5334			if (sa->sa_family == AF_INET) {
5335				struct sockaddr_in *src4;
5336
5337				sa4 = (struct sockaddr_in *)sa;
5338				src4 = (struct sockaddr_in *)src;
5339				if (sa4->sin_addr.s_addr == src4->sin_addr.s_addr) {
5340					fnd = 1;
5341					break;
5342				}
5343			}
5344#endif
5345#ifdef INET6
5346			if (sa->sa_family == AF_INET6) {
5347				struct sockaddr_in6 *src6;
5348
5349				sa6 = (struct sockaddr_in6 *)sa;
5350				src6 = (struct sockaddr_in6 *)src;
5351				if (SCTP6_ARE_ADDR_EQUAL(sa6, src6)) {
5352					fnd = 1;
5353					break;
5354				}
5355			}
5356#endif
5357		}
5358	}
5359	if (fnd == 0) {
5360		/* New address added! no need to look futher. */
5361		return (1);
5362	}
5363	/* Ok so far lets munge through the rest of the packet */
5364	offset += sizeof(struct sctp_init_chunk);
5365	phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5366	while (phdr) {
5367		sa_touse = NULL;
5368		ptype = ntohs(phdr->param_type);
5369		plen = ntohs(phdr->param_length);
5370		switch (ptype) {
5371#ifdef INET
5372		case SCTP_IPV4_ADDRESS:
5373			{
5374				struct sctp_ipv4addr_param *p4, p4_buf;
5375
5376				phdr = sctp_get_next_param(in_initpkt, offset,
5377				    (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
5378				if (plen != sizeof(struct sctp_ipv4addr_param) ||
5379				    phdr == NULL) {
5380					return (1);
5381				}
5382				p4 = (struct sctp_ipv4addr_param *)phdr;
5383				sin4.sin_addr.s_addr = p4->addr;
5384				sa_touse = (struct sockaddr *)&sin4;
5385				break;
5386			}
5387#endif
5388#ifdef INET6
5389		case SCTP_IPV6_ADDRESS:
5390			{
5391				struct sctp_ipv6addr_param *p6, p6_buf;
5392
5393				phdr = sctp_get_next_param(in_initpkt, offset,
5394				    (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
5395				if (plen != sizeof(struct sctp_ipv6addr_param) ||
5396				    phdr == NULL) {
5397					return (1);
5398				}
5399				p6 = (struct sctp_ipv6addr_param *)phdr;
5400				memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
5401				    sizeof(p6->addr));
5402				sa_touse = (struct sockaddr *)&sin6;
5403				break;
5404			}
5405#endif
5406		default:
5407			sa_touse = NULL;
5408			break;
5409		}
5410		if (sa_touse) {
5411			/* ok, sa_touse points to one to check */
5412			fnd = 0;
5413			TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5414				sa = (struct sockaddr *)&net->ro._l_addr;
5415				if (sa->sa_family != sa_touse->sa_family) {
5416					continue;
5417				}
5418#ifdef INET
5419				if (sa->sa_family == AF_INET) {
5420					sa4 = (struct sockaddr_in *)sa;
5421					if (sa4->sin_addr.s_addr ==
5422					    sin4.sin_addr.s_addr) {
5423						fnd = 1;
5424						break;
5425					}
5426				}
5427#endif
5428#ifdef INET6
5429				if (sa->sa_family == AF_INET6) {
5430					sa6 = (struct sockaddr_in6 *)sa;
5431					if (SCTP6_ARE_ADDR_EQUAL(
5432					    sa6, &sin6)) {
5433						fnd = 1;
5434						break;
5435					}
5436				}
5437#endif
5438			}
5439			if (!fnd) {
5440				/* New addr added! no need to look further */
5441				return (1);
5442			}
5443		}
5444		offset += SCTP_SIZE32(plen);
5445		phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5446	}
5447	return (0);
5448}
5449
5450/*
5451 * Given a MBUF chain that was sent into us containing an INIT. Build a
5452 * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
5453 * a pullup to include IPv6/4header, SCTP header and initial part of INIT
5454 * message (i.e. the struct sctp_init_msg).
5455 */
5456void
5457sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
5458    struct mbuf *init_pkt, int iphlen, int offset,
5459    struct sockaddr *src, struct sockaddr *dst,
5460    struct sctphdr *sh, struct sctp_init_chunk *init_chk,
5461    uint8_t mflowtype, uint32_t mflowid,
5462    uint32_t vrf_id, uint16_t port, int hold_inp_lock)
5463{
5464	struct sctp_association *asoc;
5465	struct mbuf *m, *m_tmp, *m_last, *m_cookie, *op_err;
5466	struct sctp_init_ack_chunk *initack;
5467	struct sctp_adaptation_layer_indication *ali;
5468	struct sctp_supported_chunk_types_param *pr_supported;
5469	struct sctp_paramhdr *ph;
5470	union sctp_sockstore *over_addr;
5471	struct sctp_scoping scp;
5472
5473#ifdef INET
5474	struct sockaddr_in *dst4 = (struct sockaddr_in *)dst;
5475	struct sockaddr_in *src4 = (struct sockaddr_in *)src;
5476	struct sockaddr_in *sin;
5477
5478#endif
5479#ifdef INET6
5480	struct sockaddr_in6 *dst6 = (struct sockaddr_in6 *)dst;
5481	struct sockaddr_in6 *src6 = (struct sockaddr_in6 *)src;
5482	struct sockaddr_in6 *sin6;
5483
5484#endif
5485	struct sockaddr *to;
5486	struct sctp_state_cookie stc;
5487	struct sctp_nets *net = NULL;
5488	uint8_t *signature = NULL;
5489	int cnt_inits_to = 0;
5490	uint16_t his_limit, i_want;
5491	int abort_flag;
5492	int nat_friendly = 0;
5493	struct socket *so;
5494	uint16_t num_ext, chunk_len, padding_len, parameter_len;
5495
5496	if (stcb) {
5497		asoc = &stcb->asoc;
5498	} else {
5499		asoc = NULL;
5500	}
5501	if ((asoc != NULL) &&
5502	    (SCTP_GET_STATE(asoc) != SCTP_STATE_COOKIE_WAIT) &&
5503	    (sctp_are_there_new_addresses(asoc, init_pkt, offset, src))) {
5504		/* new addresses, out of here in non-cookie-wait states */
5505		/*
5506		 * Send a ABORT, we don't add the new address error clause
5507		 * though we even set the T bit and copy in the 0 tag.. this
5508		 * looks no different than if no listener was present.
5509		 */
5510		op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5511		    "Address added");
5512		sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5513		    mflowtype, mflowid,
5514		    vrf_id, port);
5515		return;
5516	}
5517	abort_flag = 0;
5518	op_err = sctp_arethere_unrecognized_parameters(init_pkt,
5519	    (offset + sizeof(struct sctp_init_chunk)),
5520	    &abort_flag, (struct sctp_chunkhdr *)init_chk, &nat_friendly);
5521	if (abort_flag) {
5522do_a_abort:
5523		if (op_err == NULL) {
5524			char msg[SCTP_DIAG_INFO_LEN];
5525
5526			snprintf(msg, sizeof(msg), "%s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__);
5527			op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5528			    msg);
5529		}
5530		sctp_send_abort(init_pkt, iphlen, src, dst, sh,
5531		    init_chk->init.initiate_tag, op_err,
5532		    mflowtype, mflowid,
5533		    vrf_id, port);
5534		return;
5535	}
5536	m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
5537	if (m == NULL) {
5538		/* No memory, INIT timer will re-attempt. */
5539		if (op_err)
5540			sctp_m_freem(op_err);
5541		return;
5542	}
5543	chunk_len = (uint16_t) sizeof(struct sctp_init_ack_chunk);
5544	padding_len = 0;
5545
5546	/*
5547	 * We might not overwrite the identification[] completely and on
5548	 * some platforms time_entered will contain some padding. Therefore
5549	 * zero out the cookie to avoid putting uninitialized memory on the
5550	 * wire.
5551	 */
5552	memset(&stc, 0, sizeof(struct sctp_state_cookie));
5553
5554	/* the time I built cookie */
5555	(void)SCTP_GETTIME_TIMEVAL(&stc.time_entered);
5556
5557	/* populate any tie tags */
5558	if (asoc != NULL) {
5559		/* unlock before tag selections */
5560		stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
5561		stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
5562		stc.cookie_life = asoc->cookie_life;
5563		net = asoc->primary_destination;
5564	} else {
5565		stc.tie_tag_my_vtag = 0;
5566		stc.tie_tag_peer_vtag = 0;
5567		/* life I will award this cookie */
5568		stc.cookie_life = inp->sctp_ep.def_cookie_life;
5569	}
5570
5571	/* copy in the ports for later check */
5572	stc.myport = sh->dest_port;
5573	stc.peerport = sh->src_port;
5574
5575	/*
5576	 * If we wanted to honor cookie life extentions, we would add to
5577	 * stc.cookie_life. For now we should NOT honor any extension
5578	 */
5579	stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
5580	if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5581		stc.ipv6_addr_legal = 1;
5582		if (SCTP_IPV6_V6ONLY(inp)) {
5583			stc.ipv4_addr_legal = 0;
5584		} else {
5585			stc.ipv4_addr_legal = 1;
5586		}
5587	} else {
5588		stc.ipv6_addr_legal = 0;
5589		stc.ipv4_addr_legal = 1;
5590	}
5591#ifdef SCTP_DONT_DO_PRIVADDR_SCOPE
5592	stc.ipv4_scope = 1;
5593#else
5594	stc.ipv4_scope = 0;
5595#endif
5596	if (net == NULL) {
5597		to = src;
5598		switch (dst->sa_family) {
5599#ifdef INET
5600		case AF_INET:
5601			{
5602				/* lookup address */
5603				stc.address[0] = src4->sin_addr.s_addr;
5604				stc.address[1] = 0;
5605				stc.address[2] = 0;
5606				stc.address[3] = 0;
5607				stc.addr_type = SCTP_IPV4_ADDRESS;
5608				/* local from address */
5609				stc.laddress[0] = dst4->sin_addr.s_addr;
5610				stc.laddress[1] = 0;
5611				stc.laddress[2] = 0;
5612				stc.laddress[3] = 0;
5613				stc.laddr_type = SCTP_IPV4_ADDRESS;
5614				/* scope_id is only for v6 */
5615				stc.scope_id = 0;
5616#ifndef SCTP_DONT_DO_PRIVADDR_SCOPE
5617				if (IN4_ISPRIVATE_ADDRESS(&src4->sin_addr)) {
5618					stc.ipv4_scope = 1;
5619				}
5620#else
5621				stc.ipv4_scope = 1;
5622#endif				/* SCTP_DONT_DO_PRIVADDR_SCOPE */
5623				/* Must use the address in this case */
5624				if (sctp_is_address_on_local_host(src, vrf_id)) {
5625					stc.loopback_scope = 1;
5626					stc.ipv4_scope = 1;
5627					stc.site_scope = 1;
5628					stc.local_scope = 0;
5629				}
5630				break;
5631			}
5632#endif
5633#ifdef INET6
5634		case AF_INET6:
5635			{
5636				stc.addr_type = SCTP_IPV6_ADDRESS;
5637				memcpy(&stc.address, &src6->sin6_addr, sizeof(struct in6_addr));
5638				stc.scope_id = in6_getscope(&src6->sin6_addr);
5639				if (sctp_is_address_on_local_host(src, vrf_id)) {
5640					stc.loopback_scope = 1;
5641					stc.local_scope = 0;
5642					stc.site_scope = 1;
5643					stc.ipv4_scope = 1;
5644				} else if (IN6_IS_ADDR_LINKLOCAL(&src6->sin6_addr)) {
5645					/*
5646					 * If the new destination is a
5647					 * LINK_LOCAL we must have common
5648					 * both site and local scope. Don't
5649					 * set local scope though since we
5650					 * must depend on the source to be
5651					 * added implicitly. We cannot
5652					 * assure just because we share one
5653					 * link that all links are common.
5654					 */
5655					stc.local_scope = 0;
5656					stc.site_scope = 1;
5657					stc.ipv4_scope = 1;
5658					/*
5659					 * we start counting for the private
5660					 * address stuff at 1. since the
5661					 * link local we source from won't
5662					 * show up in our scoped count.
5663					 */
5664					cnt_inits_to = 1;
5665					/*
5666					 * pull out the scope_id from
5667					 * incoming pkt
5668					 */
5669				} else if (IN6_IS_ADDR_SITELOCAL(&src6->sin6_addr)) {
5670					/*
5671					 * If the new destination is
5672					 * SITE_LOCAL then we must have site
5673					 * scope in common.
5674					 */
5675					stc.site_scope = 1;
5676				}
5677				memcpy(&stc.laddress, &dst6->sin6_addr, sizeof(struct in6_addr));
5678				stc.laddr_type = SCTP_IPV6_ADDRESS;
5679				break;
5680			}
5681#endif
5682		default:
5683			/* TSNH */
5684			goto do_a_abort;
5685			break;
5686		}
5687	} else {
5688		/* set the scope per the existing tcb */
5689
5690#ifdef INET6
5691		struct sctp_nets *lnet;
5692
5693#endif
5694
5695		stc.loopback_scope = asoc->scope.loopback_scope;
5696		stc.ipv4_scope = asoc->scope.ipv4_local_scope;
5697		stc.site_scope = asoc->scope.site_scope;
5698		stc.local_scope = asoc->scope.local_scope;
5699#ifdef INET6
5700		/* Why do we not consider IPv4 LL addresses? */
5701		TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
5702			if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
5703				if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
5704					/*
5705					 * if we have a LL address, start
5706					 * counting at 1.
5707					 */
5708					cnt_inits_to = 1;
5709				}
5710			}
5711		}
5712#endif
5713		/* use the net pointer */
5714		to = (struct sockaddr *)&net->ro._l_addr;
5715		switch (to->sa_family) {
5716#ifdef INET
5717		case AF_INET:
5718			sin = (struct sockaddr_in *)to;
5719			stc.address[0] = sin->sin_addr.s_addr;
5720			stc.address[1] = 0;
5721			stc.address[2] = 0;
5722			stc.address[3] = 0;
5723			stc.addr_type = SCTP_IPV4_ADDRESS;
5724			if (net->src_addr_selected == 0) {
5725				/*
5726				 * strange case here, the INIT should have
5727				 * did the selection.
5728				 */
5729				net->ro._s_addr = sctp_source_address_selection(inp,
5730				    stcb, (sctp_route_t *) & net->ro,
5731				    net, 0, vrf_id);
5732				if (net->ro._s_addr == NULL)
5733					return;
5734
5735				net->src_addr_selected = 1;
5736
5737			}
5738			stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
5739			stc.laddress[1] = 0;
5740			stc.laddress[2] = 0;
5741			stc.laddress[3] = 0;
5742			stc.laddr_type = SCTP_IPV4_ADDRESS;
5743			/* scope_id is only for v6 */
5744			stc.scope_id = 0;
5745			break;
5746#endif
5747#ifdef INET6
5748		case AF_INET6:
5749			sin6 = (struct sockaddr_in6 *)to;
5750			memcpy(&stc.address, &sin6->sin6_addr,
5751			    sizeof(struct in6_addr));
5752			stc.addr_type = SCTP_IPV6_ADDRESS;
5753			stc.scope_id = sin6->sin6_scope_id;
5754			if (net->src_addr_selected == 0) {
5755				/*
5756				 * strange case here, the INIT should have
5757				 * done the selection.
5758				 */
5759				net->ro._s_addr = sctp_source_address_selection(inp,
5760				    stcb, (sctp_route_t *) & net->ro,
5761				    net, 0, vrf_id);
5762				if (net->ro._s_addr == NULL)
5763					return;
5764
5765				net->src_addr_selected = 1;
5766			}
5767			memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
5768			    sizeof(struct in6_addr));
5769			stc.laddr_type = SCTP_IPV6_ADDRESS;
5770			break;
5771#endif
5772		}
5773	}
5774	/* Now lets put the SCTP header in place */
5775	initack = mtod(m, struct sctp_init_ack_chunk *);
5776	/* Save it off for quick ref */
5777	stc.peers_vtag = init_chk->init.initiate_tag;
5778	/* who are we */
5779	memcpy(stc.identification, SCTP_VERSION_STRING,
5780	    min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
5781	memset(stc.reserved, 0, SCTP_RESERVE_SPACE);
5782	/* now the chunk header */
5783	initack->ch.chunk_type = SCTP_INITIATION_ACK;
5784	initack->ch.chunk_flags = 0;
5785	/* fill in later from mbuf we build */
5786	initack->ch.chunk_length = 0;
5787	/* place in my tag */
5788	if ((asoc != NULL) &&
5789	    ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
5790	    (SCTP_GET_STATE(asoc) == SCTP_STATE_INUSE) ||
5791	    (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED))) {
5792		/* re-use the v-tags and init-seq here */
5793		initack->init.initiate_tag = htonl(asoc->my_vtag);
5794		initack->init.initial_tsn = htonl(asoc->init_seq_number);
5795	} else {
5796		uint32_t vtag, itsn;
5797
5798		if (hold_inp_lock) {
5799			SCTP_INP_INCR_REF(inp);
5800			SCTP_INP_RUNLOCK(inp);
5801		}
5802		if (asoc) {
5803			atomic_add_int(&asoc->refcnt, 1);
5804			SCTP_TCB_UNLOCK(stcb);
5805	new_tag:
5806			vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5807			if ((asoc->peer_supports_nat) && (vtag == asoc->my_vtag)) {
5808				/*
5809				 * Got a duplicate vtag on some guy behind a
5810				 * nat make sure we don't use it.
5811				 */
5812				goto new_tag;
5813			}
5814			initack->init.initiate_tag = htonl(vtag);
5815			/* get a TSN to use too */
5816			itsn = sctp_select_initial_TSN(&inp->sctp_ep);
5817			initack->init.initial_tsn = htonl(itsn);
5818			SCTP_TCB_LOCK(stcb);
5819			atomic_add_int(&asoc->refcnt, -1);
5820		} else {
5821			vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5822			initack->init.initiate_tag = htonl(vtag);
5823			/* get a TSN to use too */
5824			initack->init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
5825		}
5826		if (hold_inp_lock) {
5827			SCTP_INP_RLOCK(inp);
5828			SCTP_INP_DECR_REF(inp);
5829		}
5830	}
5831	/* save away my tag to */
5832	stc.my_vtag = initack->init.initiate_tag;
5833
5834	/* set up some of the credits. */
5835	so = inp->sctp_socket;
5836	if (so == NULL) {
5837		/* memory problem */
5838		sctp_m_freem(m);
5839		return;
5840	} else {
5841		initack->init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
5842	}
5843	/* set what I want */
5844	his_limit = ntohs(init_chk->init.num_inbound_streams);
5845	/* choose what I want */
5846	if (asoc != NULL) {
5847		if (asoc->streamoutcnt > inp->sctp_ep.pre_open_stream_count) {
5848			i_want = asoc->streamoutcnt;
5849		} else {
5850			i_want = inp->sctp_ep.pre_open_stream_count;
5851		}
5852	} else {
5853		i_want = inp->sctp_ep.pre_open_stream_count;
5854	}
5855	if (his_limit < i_want) {
5856		/* I Want more :< */
5857		initack->init.num_outbound_streams = init_chk->init.num_inbound_streams;
5858	} else {
5859		/* I can have what I want :> */
5860		initack->init.num_outbound_streams = htons(i_want);
5861	}
5862	/* tell him his limit. */
5863	initack->init.num_inbound_streams =
5864	    htons(inp->sctp_ep.max_open_streams_intome);
5865
5866	/* adaptation layer indication parameter */
5867	if (inp->sctp_ep.adaptation_layer_indicator_provided) {
5868		parameter_len = (uint16_t) sizeof(struct sctp_adaptation_layer_indication);
5869		ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
5870		ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
5871		ali->ph.param_length = htons(parameter_len);
5872		ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
5873		chunk_len += parameter_len;
5874	}
5875	/* ECN parameter */
5876	if (((asoc != NULL) && (asoc->ecn_supported == 1)) ||
5877	    ((asoc == NULL) && (inp->ecn_supported == 1))) {
5878		parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
5879		ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5880		ph->param_type = htons(SCTP_ECN_CAPABLE);
5881		ph->param_length = htons(parameter_len);
5882		chunk_len += parameter_len;
5883	}
5884	/* PR-SCTP supported parameter */
5885	if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5886	    ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5887		parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
5888		ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5889		ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
5890		ph->param_length = htons(parameter_len);
5891		chunk_len += parameter_len;
5892	}
5893	/* Add NAT friendly parameter */
5894	if (nat_friendly) {
5895		parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
5896		ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5897		ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
5898		ph->param_length = htons(parameter_len);
5899		chunk_len += parameter_len;
5900	}
5901	/* And now tell the peer which extensions we support */
5902	num_ext = 0;
5903	pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
5904	if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5905	    ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5906		pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
5907	}
5908	if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
5909	    ((asoc == NULL) && (inp->auth_supported == 1))) {
5910		pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
5911	}
5912	if (((asoc != NULL) && (asoc->asconf_supported == 1)) ||
5913	    ((asoc == NULL) && (inp->asconf_supported == 1))) {
5914		pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
5915		pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
5916	}
5917	if (((asoc != NULL) && (asoc->reconfig_supported == 1)) ||
5918	    ((asoc == NULL) && (inp->reconfig_supported == 1))) {
5919		pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
5920	}
5921	if (((asoc != NULL) && (asoc->nrsack_supported == 1)) ||
5922	    ((asoc == NULL) && (inp->nrsack_supported == 1))) {
5923		pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
5924	}
5925	if (((asoc != NULL) && (asoc->pktdrop_supported == 1)) ||
5926	    ((asoc == NULL) && (inp->pktdrop_supported == 1))) {
5927		pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
5928	}
5929	if (num_ext > 0) {
5930		parameter_len = (uint16_t) sizeof(struct sctp_supported_chunk_types_param) + num_ext;
5931		pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
5932		pr_supported->ph.param_length = htons(parameter_len);
5933		padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
5934		chunk_len += parameter_len;
5935	}
5936	/* add authentication parameters */
5937	if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
5938	    ((asoc == NULL) && (inp->auth_supported == 1))) {
5939		struct sctp_auth_random *randp;
5940		struct sctp_auth_hmac_algo *hmacs;
5941		struct sctp_auth_chunk_list *chunks;
5942
5943		if (padding_len > 0) {
5944			memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
5945			chunk_len += padding_len;
5946			padding_len = 0;
5947		}
5948		/* generate and add RANDOM parameter */
5949		randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
5950		parameter_len = (uint16_t) sizeof(struct sctp_auth_random) +
5951		    SCTP_AUTH_RANDOM_SIZE_DEFAULT;
5952		randp->ph.param_type = htons(SCTP_RANDOM);
5953		randp->ph.param_length = htons(parameter_len);
5954		SCTP_READ_RANDOM(randp->random_data, SCTP_AUTH_RANDOM_SIZE_DEFAULT);
5955		padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
5956		chunk_len += parameter_len;
5957
5958		if (padding_len > 0) {
5959			memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
5960			chunk_len += padding_len;
5961			padding_len = 0;
5962		}
5963		/* add HMAC_ALGO parameter */
5964		hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
5965		parameter_len = (uint16_t) sizeof(struct sctp_auth_hmac_algo) +
5966		    sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
5967		    (uint8_t *) hmacs->hmac_ids);
5968		hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
5969		hmacs->ph.param_length = htons(parameter_len);
5970		padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
5971		chunk_len += parameter_len;
5972
5973		if (padding_len > 0) {
5974			memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
5975			chunk_len += padding_len;
5976			padding_len = 0;
5977		}
5978		/* add CHUNKS parameter */
5979		chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
5980		parameter_len = (uint16_t) sizeof(struct sctp_auth_chunk_list) +
5981		    sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
5982		    chunks->chunk_types);
5983		chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
5984		chunks->ph.param_length = htons(parameter_len);
5985		padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
5986		chunk_len += parameter_len;
5987	}
5988	SCTP_BUF_LEN(m) = chunk_len;
5989	m_last = m;
5990	/* now the addresses */
5991	/*
5992	 * To optimize this we could put the scoping stuff into a structure
5993	 * and remove the individual uint8's from the stc structure. Then we
5994	 * could just sifa in the address within the stc.. but for now this
5995	 * is a quick hack to get the address stuff teased apart.
5996	 */
5997	scp.ipv4_addr_legal = stc.ipv4_addr_legal;
5998	scp.ipv6_addr_legal = stc.ipv6_addr_legal;
5999	scp.loopback_scope = stc.loopback_scope;
6000	scp.ipv4_local_scope = stc.ipv4_scope;
6001	scp.local_scope = stc.local_scope;
6002	scp.site_scope = stc.site_scope;
6003	m_last = sctp_add_addresses_to_i_ia(inp, stcb, &scp, m_last,
6004	    cnt_inits_to,
6005	    &padding_len, &chunk_len);
6006	/* padding_len can only be positive, if no addresses have been added */
6007	if (padding_len > 0) {
6008		memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6009		chunk_len += padding_len;
6010		SCTP_BUF_LEN(m) += padding_len;
6011		padding_len = 0;
6012	}
6013	/* tack on the operational error if present */
6014	if (op_err) {
6015		parameter_len = 0;
6016		for (m_tmp = op_err; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6017			parameter_len += SCTP_BUF_LEN(m_tmp);
6018		}
6019		padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6020		SCTP_BUF_NEXT(m_last) = op_err;
6021		while (SCTP_BUF_NEXT(m_last) != NULL) {
6022			m_last = SCTP_BUF_NEXT(m_last);
6023		}
6024		chunk_len += parameter_len;
6025	}
6026	if (padding_len > 0) {
6027		m_last = sctp_add_pad_tombuf(m_last, padding_len);
6028		if (m_last == NULL) {
6029			/* Houston we have a problem, no space */
6030			sctp_m_freem(m);
6031			return;
6032		}
6033		chunk_len += padding_len;
6034		padding_len = 0;
6035	}
6036	/* Now we must build a cookie */
6037	m_cookie = sctp_add_cookie(init_pkt, offset, m, 0, &stc, &signature);
6038	if (m_cookie == NULL) {
6039		/* memory problem */
6040		sctp_m_freem(m);
6041		return;
6042	}
6043	/* Now append the cookie to the end and update the space/size */
6044	SCTP_BUF_NEXT(m_last) = m_cookie;
6045	parameter_len = 0;
6046	for (m_tmp = m_cookie; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6047		parameter_len += SCTP_BUF_LEN(m_tmp);
6048		if (SCTP_BUF_NEXT(m_tmp) == NULL) {
6049			m_last = m_tmp;
6050		}
6051	}
6052	padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6053	chunk_len += parameter_len;
6054
6055	/*
6056	 * Place in the size, but we don't include the last pad (if any) in
6057	 * the INIT-ACK.
6058	 */
6059	initack->ch.chunk_length = htons(chunk_len);
6060
6061	/*
6062	 * Time to sign the cookie, we don't sign over the cookie signature
6063	 * though thus we set trailer.
6064	 */
6065	(void)sctp_hmac_m(SCTP_HMAC,
6066	    (uint8_t *) inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
6067	    SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
6068	    (uint8_t *) signature, SCTP_SIGNATURE_SIZE);
6069	/*
6070	 * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
6071	 * here since the timer will drive a retranmission.
6072	 */
6073	if (padding_len > 0) {
6074		if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
6075			sctp_m_freem(m);
6076			return;
6077		}
6078	}
6079	if (stc.loopback_scope) {
6080		over_addr = (union sctp_sockstore *)dst;
6081	} else {
6082		over_addr = NULL;
6083	}
6084
6085	(void)sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
6086	    0, 0,
6087	    inp->sctp_lport, sh->src_port, init_chk->init.initiate_tag,
6088	    port, over_addr,
6089	    mflowtype, mflowid,
6090	    SCTP_SO_NOT_LOCKED);
6091	SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
6092}
6093
6094
6095static void
6096sctp_prune_prsctp(struct sctp_tcb *stcb,
6097    struct sctp_association *asoc,
6098    struct sctp_sndrcvinfo *srcv,
6099    int dataout)
6100{
6101	int freed_spc = 0;
6102	struct sctp_tmit_chunk *chk, *nchk;
6103
6104	SCTP_TCB_LOCK_ASSERT(stcb);
6105	if ((asoc->prsctp_supported) &&
6106	    (asoc->sent_queue_cnt_removeable > 0)) {
6107		TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
6108			/*
6109			 * Look for chunks marked with the PR_SCTP flag AND
6110			 * the buffer space flag. If the one being sent is
6111			 * equal or greater priority then purge the old one
6112			 * and free some space.
6113			 */
6114			if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6115				/*
6116				 * This one is PR-SCTP AND buffer space
6117				 * limited type
6118				 */
6119				if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6120					/*
6121					 * Lower numbers equates to higher
6122					 * priority so if the one we are
6123					 * looking at has a larger or equal
6124					 * priority we want to drop the data
6125					 * and NOT retransmit it.
6126					 */
6127					if (chk->data) {
6128						/*
6129						 * We release the book_size
6130						 * if the mbuf is here
6131						 */
6132						int ret_spc;
6133						uint8_t sent;
6134
6135						if (chk->sent > SCTP_DATAGRAM_UNSENT)
6136							sent = 1;
6137						else
6138							sent = 0;
6139						ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6140						    sent,
6141						    SCTP_SO_LOCKED);
6142						freed_spc += ret_spc;
6143						if (freed_spc >= dataout) {
6144							return;
6145						}
6146					}	/* if chunk was present */
6147				}	/* if of sufficent priority */
6148			}	/* if chunk has enabled */
6149		}		/* tailqforeach */
6150
6151		TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
6152			/* Here we must move to the sent queue and mark */
6153			if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6154				if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6155					if (chk->data) {
6156						/*
6157						 * We release the book_size
6158						 * if the mbuf is here
6159						 */
6160						int ret_spc;
6161
6162						ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6163						    0, SCTP_SO_LOCKED);
6164
6165						freed_spc += ret_spc;
6166						if (freed_spc >= dataout) {
6167							return;
6168						}
6169					}	/* end if chk->data */
6170				}	/* end if right class */
6171			}	/* end if chk pr-sctp */
6172		}		/* tailqforeachsafe (chk) */
6173	}			/* if enabled in asoc */
6174}
6175
6176int
6177sctp_get_frag_point(struct sctp_tcb *stcb,
6178    struct sctp_association *asoc)
6179{
6180	int siz, ovh;
6181
6182	/*
6183	 * For endpoints that have both v6 and v4 addresses we must reserve
6184	 * room for the ipv6 header, for those that are only dealing with V4
6185	 * we use a larger frag point.
6186	 */
6187	if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
6188		ovh = SCTP_MED_OVERHEAD;
6189	} else {
6190		ovh = SCTP_MED_V4_OVERHEAD;
6191	}
6192
6193	if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
6194		siz = asoc->smallest_mtu - ovh;
6195	else
6196		siz = (stcb->asoc.sctp_frag_point - ovh);
6197	/*
6198	 * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
6199	 */
6200	/* A data chunk MUST fit in a cluster */
6201	/* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
6202	/* } */
6203
6204	/* adjust for an AUTH chunk if DATA requires auth */
6205	if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
6206		siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
6207
6208	if (siz % 4) {
6209		/* make it an even word boundary please */
6210		siz -= (siz % 4);
6211	}
6212	return (siz);
6213}
6214
6215static void
6216sctp_set_prsctp_policy(struct sctp_stream_queue_pending *sp)
6217{
6218	/*
6219	 * We assume that the user wants PR_SCTP_TTL if the user provides a
6220	 * positive lifetime but does not specify any PR_SCTP policy.
6221	 */
6222	if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
6223		sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6224	} else if (sp->timetolive > 0) {
6225		sp->sinfo_flags |= SCTP_PR_SCTP_TTL;
6226		sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6227	} else {
6228		return;
6229	}
6230	switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
6231	case CHUNK_FLAGS_PR_SCTP_BUF:
6232		/*
6233		 * Time to live is a priority stored in tv_sec when doing
6234		 * the buffer drop thing.
6235		 */
6236		sp->ts.tv_sec = sp->timetolive;
6237		sp->ts.tv_usec = 0;
6238		break;
6239	case CHUNK_FLAGS_PR_SCTP_TTL:
6240		{
6241			struct timeval tv;
6242
6243			(void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6244			tv.tv_sec = sp->timetolive / 1000;
6245			tv.tv_usec = (sp->timetolive * 1000) % 1000000;
6246			/*
6247			 * TODO sctp_constants.h needs alternative time
6248			 * macros when _KERNEL is undefined.
6249			 */
6250			timevaladd(&sp->ts, &tv);
6251		}
6252		break;
6253	case CHUNK_FLAGS_PR_SCTP_RTX:
6254		/*
6255		 * Time to live is a the number or retransmissions stored in
6256		 * tv_sec.
6257		 */
6258		sp->ts.tv_sec = sp->timetolive;
6259		sp->ts.tv_usec = 0;
6260		break;
6261	default:
6262		SCTPDBG(SCTP_DEBUG_USRREQ1,
6263		    "Unknown PR_SCTP policy %u.\n",
6264		    PR_SCTP_POLICY(sp->sinfo_flags));
6265		break;
6266	}
6267}
6268
6269static int
6270sctp_msg_append(struct sctp_tcb *stcb,
6271    struct sctp_nets *net,
6272    struct mbuf *m,
6273    struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
6274{
6275	int error = 0;
6276	struct mbuf *at;
6277	struct sctp_stream_queue_pending *sp = NULL;
6278	struct sctp_stream_out *strm;
6279
6280	/*
6281	 * Given an mbuf chain, put it into the association send queue and
6282	 * place it on the wheel
6283	 */
6284	if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
6285		/* Invalid stream number */
6286		SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6287		error = EINVAL;
6288		goto out_now;
6289	}
6290	if ((stcb->asoc.stream_locked) &&
6291	    (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
6292		SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6293		error = EINVAL;
6294		goto out_now;
6295	}
6296	strm = &stcb->asoc.strmout[srcv->sinfo_stream];
6297	/* Now can we send this? */
6298	if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
6299	    (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
6300	    (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
6301	    (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
6302		/* got data while shutting down */
6303		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
6304		error = ECONNRESET;
6305		goto out_now;
6306	}
6307	sctp_alloc_a_strmoq(stcb, sp);
6308	if (sp == NULL) {
6309		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6310		error = ENOMEM;
6311		goto out_now;
6312	}
6313	sp->sinfo_flags = srcv->sinfo_flags;
6314	sp->timetolive = srcv->sinfo_timetolive;
6315	sp->ppid = srcv->sinfo_ppid;
6316	sp->context = srcv->sinfo_context;
6317	if (sp->sinfo_flags & SCTP_ADDR_OVER) {
6318		sp->net = net;
6319		atomic_add_int(&sp->net->ref_count, 1);
6320	} else {
6321		sp->net = NULL;
6322	}
6323	(void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6324	sp->stream = srcv->sinfo_stream;
6325	sp->msg_is_complete = 1;
6326	sp->sender_all_done = 1;
6327	sp->some_taken = 0;
6328	sp->data = m;
6329	sp->tail_mbuf = NULL;
6330	sctp_set_prsctp_policy(sp);
6331	/*
6332	 * We could in theory (for sendall) sifa the length in, but we would
6333	 * still have to hunt through the chain since we need to setup the
6334	 * tail_mbuf
6335	 */
6336	sp->length = 0;
6337	for (at = m; at; at = SCTP_BUF_NEXT(at)) {
6338		if (SCTP_BUF_NEXT(at) == NULL)
6339			sp->tail_mbuf = at;
6340		sp->length += SCTP_BUF_LEN(at);
6341	}
6342	if (srcv->sinfo_keynumber_valid) {
6343		sp->auth_keyid = srcv->sinfo_keynumber;
6344	} else {
6345		sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
6346	}
6347	if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
6348		sctp_auth_key_acquire(stcb, sp->auth_keyid);
6349		sp->holds_key_ref = 1;
6350	}
6351	if (hold_stcb_lock == 0) {
6352		SCTP_TCB_SEND_LOCK(stcb);
6353	}
6354	sctp_snd_sb_alloc(stcb, sp->length);
6355	atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
6356	TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
6357	stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, &stcb->asoc, strm, sp, 1);
6358	m = NULL;
6359	if (hold_stcb_lock == 0) {
6360		SCTP_TCB_SEND_UNLOCK(stcb);
6361	}
6362out_now:
6363	if (m) {
6364		sctp_m_freem(m);
6365	}
6366	return (error);
6367}
6368
6369
6370static struct mbuf *
6371sctp_copy_mbufchain(struct mbuf *clonechain,
6372    struct mbuf *outchain,
6373    struct mbuf **endofchain,
6374    int can_take_mbuf,
6375    int sizeofcpy,
6376    uint8_t copy_by_ref)
6377{
6378	struct mbuf *m;
6379	struct mbuf *appendchain;
6380	caddr_t cp;
6381	int len;
6382
6383	if (endofchain == NULL) {
6384		/* error */
6385error_out:
6386		if (outchain)
6387			sctp_m_freem(outchain);
6388		return (NULL);
6389	}
6390	if (can_take_mbuf) {
6391		appendchain = clonechain;
6392	} else {
6393		if (!copy_by_ref &&
6394		    (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))
6395		    ) {
6396			/* Its not in a cluster */
6397			if (*endofchain == NULL) {
6398				/* lets get a mbuf cluster */
6399				if (outchain == NULL) {
6400					/* This is the general case */
6401			new_mbuf:
6402					outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6403					if (outchain == NULL) {
6404						goto error_out;
6405					}
6406					SCTP_BUF_LEN(outchain) = 0;
6407					*endofchain = outchain;
6408					/* get the prepend space */
6409					SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
6410				} else {
6411					/*
6412					 * We really should not get a NULL
6413					 * in endofchain
6414					 */
6415					/* find end */
6416					m = outchain;
6417					while (m) {
6418						if (SCTP_BUF_NEXT(m) == NULL) {
6419							*endofchain = m;
6420							break;
6421						}
6422						m = SCTP_BUF_NEXT(m);
6423					}
6424					/* sanity */
6425					if (*endofchain == NULL) {
6426						/*
6427						 * huh, TSNH XXX maybe we
6428						 * should panic
6429						 */
6430						sctp_m_freem(outchain);
6431						goto new_mbuf;
6432					}
6433				}
6434				/* get the new end of length */
6435				len = M_TRAILINGSPACE(*endofchain);
6436			} else {
6437				/* how much is left at the end? */
6438				len = M_TRAILINGSPACE(*endofchain);
6439			}
6440			/* Find the end of the data, for appending */
6441			cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
6442
6443			/* Now lets copy it out */
6444			if (len >= sizeofcpy) {
6445				/* It all fits, copy it in */
6446				m_copydata(clonechain, 0, sizeofcpy, cp);
6447				SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6448			} else {
6449				/* fill up the end of the chain */
6450				if (len > 0) {
6451					m_copydata(clonechain, 0, len, cp);
6452					SCTP_BUF_LEN((*endofchain)) += len;
6453					/* now we need another one */
6454					sizeofcpy -= len;
6455				}
6456				m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6457				if (m == NULL) {
6458					/* We failed */
6459					goto error_out;
6460				}
6461				SCTP_BUF_NEXT((*endofchain)) = m;
6462				*endofchain = m;
6463				cp = mtod((*endofchain), caddr_t);
6464				m_copydata(clonechain, len, sizeofcpy, cp);
6465				SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6466			}
6467			return (outchain);
6468		} else {
6469			/* copy the old fashion way */
6470			appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_NOWAIT);
6471#ifdef SCTP_MBUF_LOGGING
6472			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6473				sctp_log_mbc(appendchain, SCTP_MBUF_ICOPY);
6474			}
6475#endif
6476		}
6477	}
6478	if (appendchain == NULL) {
6479		/* error */
6480		if (outchain)
6481			sctp_m_freem(outchain);
6482		return (NULL);
6483	}
6484	if (outchain) {
6485		/* tack on to the end */
6486		if (*endofchain != NULL) {
6487			SCTP_BUF_NEXT(((*endofchain))) = appendchain;
6488		} else {
6489			m = outchain;
6490			while (m) {
6491				if (SCTP_BUF_NEXT(m) == NULL) {
6492					SCTP_BUF_NEXT(m) = appendchain;
6493					break;
6494				}
6495				m = SCTP_BUF_NEXT(m);
6496			}
6497		}
6498		/*
6499		 * save off the end and update the end-chain postion
6500		 */
6501		m = appendchain;
6502		while (m) {
6503			if (SCTP_BUF_NEXT(m) == NULL) {
6504				*endofchain = m;
6505				break;
6506			}
6507			m = SCTP_BUF_NEXT(m);
6508		}
6509		return (outchain);
6510	} else {
6511		/* save off the end and update the end-chain postion */
6512		m = appendchain;
6513		while (m) {
6514			if (SCTP_BUF_NEXT(m) == NULL) {
6515				*endofchain = m;
6516				break;
6517			}
6518			m = SCTP_BUF_NEXT(m);
6519		}
6520		return (appendchain);
6521	}
6522}
6523
6524static int
6525sctp_med_chunk_output(struct sctp_inpcb *inp,
6526    struct sctp_tcb *stcb,
6527    struct sctp_association *asoc,
6528    int *num_out,
6529    int *reason_code,
6530    int control_only, int from_where,
6531    struct timeval *now, int *now_filled, int frag_point, int so_locked
6532#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6533    SCTP_UNUSED
6534#endif
6535);
6536
6537static void
6538sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
6539    uint32_t val SCTP_UNUSED)
6540{
6541	struct sctp_copy_all *ca;
6542	struct mbuf *m;
6543	int ret = 0;
6544	int added_control = 0;
6545	int un_sent, do_chunk_output = 1;
6546	struct sctp_association *asoc;
6547	struct sctp_nets *net;
6548
6549	ca = (struct sctp_copy_all *)ptr;
6550	if (ca->m == NULL) {
6551		return;
6552	}
6553	if (ca->inp != inp) {
6554		/* TSNH */
6555		return;
6556	}
6557	if (ca->sndlen > 0) {
6558		m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_NOWAIT);
6559		if (m == NULL) {
6560			/* can't copy so we are done */
6561			ca->cnt_failed++;
6562			return;
6563		}
6564#ifdef SCTP_MBUF_LOGGING
6565		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6566			sctp_log_mbc(m, SCTP_MBUF_ICOPY);
6567		}
6568#endif
6569	} else {
6570		m = NULL;
6571	}
6572	SCTP_TCB_LOCK_ASSERT(stcb);
6573	if (stcb->asoc.alternate) {
6574		net = stcb->asoc.alternate;
6575	} else {
6576		net = stcb->asoc.primary_destination;
6577	}
6578	if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
6579		/* Abort this assoc with m as the user defined reason */
6580		if (m != NULL) {
6581			SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_NOWAIT);
6582		} else {
6583			m = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
6584			    0, M_NOWAIT, 1, MT_DATA);
6585			SCTP_BUF_LEN(m) = sizeof(struct sctp_paramhdr);
6586		}
6587		if (m != NULL) {
6588			struct sctp_paramhdr *ph;
6589
6590			ph = mtod(m, struct sctp_paramhdr *);
6591			ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
6592			ph->param_length = htons(sizeof(struct sctp_paramhdr) + ca->sndlen);
6593		}
6594		/*
6595		 * We add one here to keep the assoc from dis-appearing on
6596		 * us.
6597		 */
6598		atomic_add_int(&stcb->asoc.refcnt, 1);
6599		sctp_abort_an_association(inp, stcb, m, SCTP_SO_NOT_LOCKED);
6600		/*
6601		 * sctp_abort_an_association calls sctp_free_asoc() free
6602		 * association will NOT free it since we incremented the
6603		 * refcnt .. we do this to prevent it being freed and things
6604		 * getting tricky since we could end up (from free_asoc)
6605		 * calling inpcb_free which would get a recursive lock call
6606		 * to the iterator lock.. But as a consequence of that the
6607		 * stcb will return to us un-locked.. since free_asoc
6608		 * returns with either no TCB or the TCB unlocked, we must
6609		 * relock.. to unlock in the iterator timer :-0
6610		 */
6611		SCTP_TCB_LOCK(stcb);
6612		atomic_add_int(&stcb->asoc.refcnt, -1);
6613		goto no_chunk_output;
6614	} else {
6615		if (m) {
6616			ret = sctp_msg_append(stcb, net, m,
6617			    &ca->sndrcv, 1);
6618		}
6619		asoc = &stcb->asoc;
6620		if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
6621			/* shutdown this assoc */
6622			int cnt;
6623
6624			cnt = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED);
6625
6626			if (TAILQ_EMPTY(&asoc->send_queue) &&
6627			    TAILQ_EMPTY(&asoc->sent_queue) &&
6628			    (cnt == 0)) {
6629				if (asoc->locked_on_sending) {
6630					goto abort_anyway;
6631				}
6632				/*
6633				 * there is nothing queued to send, so I'm
6634				 * done...
6635				 */
6636				if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6637				    (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6638				    (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6639					/*
6640					 * only send SHUTDOWN the first time
6641					 * through
6642					 */
6643					if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
6644						SCTP_STAT_DECR_GAUGE32(sctps_currestab);
6645					}
6646					SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
6647					SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
6648					sctp_stop_timers_for_shutdown(stcb);
6649					sctp_send_shutdown(stcb, net);
6650					sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
6651					    net);
6652					sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6653					    asoc->primary_destination);
6654					added_control = 1;
6655					do_chunk_output = 0;
6656				}
6657			} else {
6658				/*
6659				 * we still got (or just got) data to send,
6660				 * so set SHUTDOWN_PENDING
6661				 */
6662				/*
6663				 * XXX sockets draft says that SCTP_EOF
6664				 * should be sent with no data.  currently,
6665				 * we will allow user data to be sent first
6666				 * and move to SHUTDOWN-PENDING
6667				 */
6668				if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6669				    (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6670				    (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6671					if (asoc->locked_on_sending) {
6672						/*
6673						 * Locked to send out the
6674						 * data
6675						 */
6676						struct sctp_stream_queue_pending *sp;
6677
6678						sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
6679						if (sp) {
6680							if ((sp->length == 0) && (sp->msg_is_complete == 0))
6681								asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
6682						}
6683					}
6684					asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
6685					if (TAILQ_EMPTY(&asoc->send_queue) &&
6686					    TAILQ_EMPTY(&asoc->sent_queue) &&
6687					    (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
6688				abort_anyway:
6689						atomic_add_int(&stcb->asoc.refcnt, 1);
6690						sctp_abort_an_association(stcb->sctp_ep, stcb,
6691						    NULL, SCTP_SO_NOT_LOCKED);
6692						atomic_add_int(&stcb->asoc.refcnt, -1);
6693						goto no_chunk_output;
6694					}
6695					sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6696					    asoc->primary_destination);
6697				}
6698			}
6699
6700		}
6701	}
6702	un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
6703	    (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
6704
6705	if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
6706	    (stcb->asoc.total_flight > 0) &&
6707	    (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
6708		do_chunk_output = 0;
6709	}
6710	if (do_chunk_output)
6711		sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
6712	else if (added_control) {
6713		int num_out, reason, now_filled = 0;
6714		struct timeval now;
6715		int frag_point;
6716
6717		frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
6718		(void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
6719		    &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
6720	}
6721no_chunk_output:
6722	if (ret) {
6723		ca->cnt_failed++;
6724	} else {
6725		ca->cnt_sent++;
6726	}
6727}
6728
6729static void
6730sctp_sendall_completes(void *ptr, uint32_t val SCTP_UNUSED)
6731{
6732	struct sctp_copy_all *ca;
6733
6734	ca = (struct sctp_copy_all *)ptr;
6735	/*
6736	 * Do a notify here? Kacheong suggests that the notify be done at
6737	 * the send time.. so you would push up a notification if any send
6738	 * failed. Don't know if this is feasable since the only failures we
6739	 * have is "memory" related and if you cannot get an mbuf to send
6740	 * the data you surely can't get an mbuf to send up to notify the
6741	 * user you can't send the data :->
6742	 */
6743
6744	/* now free everything */
6745	sctp_m_freem(ca->m);
6746	SCTP_FREE(ca, SCTP_M_COPYAL);
6747}
6748
6749static struct mbuf *
6750sctp_copy_out_all(struct uio *uio, int len)
6751{
6752	struct mbuf *ret, *at;
6753	int left, willcpy, cancpy, error;
6754
6755	ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAITOK, 1, MT_DATA);
6756	if (ret == NULL) {
6757		/* TSNH */
6758		return (NULL);
6759	}
6760	left = len;
6761	SCTP_BUF_LEN(ret) = 0;
6762	/* save space for the data chunk header */
6763	cancpy = M_TRAILINGSPACE(ret);
6764	willcpy = min(cancpy, left);
6765	at = ret;
6766	while (left > 0) {
6767		/* Align data to the end */
6768		error = uiomove(mtod(at, caddr_t), willcpy, uio);
6769		if (error) {
6770	err_out_now:
6771			sctp_m_freem(at);
6772			return (NULL);
6773		}
6774		SCTP_BUF_LEN(at) = willcpy;
6775		SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
6776		left -= willcpy;
6777		if (left > 0) {
6778			SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg(left, 0, M_WAITOK, 1, MT_DATA);
6779			if (SCTP_BUF_NEXT(at) == NULL) {
6780				goto err_out_now;
6781			}
6782			at = SCTP_BUF_NEXT(at);
6783			SCTP_BUF_LEN(at) = 0;
6784			cancpy = M_TRAILINGSPACE(at);
6785			willcpy = min(cancpy, left);
6786		}
6787	}
6788	return (ret);
6789}
6790
6791static int
6792sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
6793    struct sctp_sndrcvinfo *srcv)
6794{
6795	int ret;
6796	struct sctp_copy_all *ca;
6797
6798	SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
6799	    SCTP_M_COPYAL);
6800	if (ca == NULL) {
6801		sctp_m_freem(m);
6802		SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6803		return (ENOMEM);
6804	}
6805	memset(ca, 0, sizeof(struct sctp_copy_all));
6806
6807	ca->inp = inp;
6808	if (srcv) {
6809		memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
6810	}
6811	/*
6812	 * take off the sendall flag, it would be bad if we failed to do
6813	 * this :-0
6814	 */
6815	ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
6816	/* get length and mbuf chain */
6817	if (uio) {
6818		ca->sndlen = uio->uio_resid;
6819		ca->m = sctp_copy_out_all(uio, ca->sndlen);
6820		if (ca->m == NULL) {
6821			SCTP_FREE(ca, SCTP_M_COPYAL);
6822			SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6823			return (ENOMEM);
6824		}
6825	} else {
6826		/* Gather the length of the send */
6827		struct mbuf *mat;
6828
6829		ca->sndlen = 0;
6830		for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
6831			ca->sndlen += SCTP_BUF_LEN(mat);
6832		}
6833	}
6834	ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
6835	    SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
6836	    SCTP_ASOC_ANY_STATE,
6837	    (void *)ca, 0,
6838	    sctp_sendall_completes, inp, 1);
6839	if (ret) {
6840		SCTP_PRINTF("Failed to initiate iterator for sendall\n");
6841		SCTP_FREE(ca, SCTP_M_COPYAL);
6842		SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
6843		return (EFAULT);
6844	}
6845	return (0);
6846}
6847
6848
6849void
6850sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
6851{
6852	struct sctp_tmit_chunk *chk, *nchk;
6853
6854	TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6855		if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
6856			TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6857			if (chk->data) {
6858				sctp_m_freem(chk->data);
6859				chk->data = NULL;
6860			}
6861			asoc->ctrl_queue_cnt--;
6862			sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6863		}
6864	}
6865}
6866
6867void
6868sctp_toss_old_asconf(struct sctp_tcb *stcb)
6869{
6870	struct sctp_association *asoc;
6871	struct sctp_tmit_chunk *chk, *nchk;
6872	struct sctp_asconf_chunk *acp;
6873
6874	asoc = &stcb->asoc;
6875	TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
6876		/* find SCTP_ASCONF chunk in queue */
6877		if (chk->rec.chunk_id.id == SCTP_ASCONF) {
6878			if (chk->data) {
6879				acp = mtod(chk->data, struct sctp_asconf_chunk *);
6880				if (SCTP_TSN_GT(ntohl(acp->serial_number), asoc->asconf_seq_out_acked)) {
6881					/* Not Acked yet */
6882					break;
6883				}
6884			}
6885			TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
6886			if (chk->data) {
6887				sctp_m_freem(chk->data);
6888				chk->data = NULL;
6889			}
6890			asoc->ctrl_queue_cnt--;
6891			sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6892		}
6893	}
6894}
6895
6896
6897static void
6898sctp_clean_up_datalist(struct sctp_tcb *stcb,
6899    struct sctp_association *asoc,
6900    struct sctp_tmit_chunk **data_list,
6901    int bundle_at,
6902    struct sctp_nets *net)
6903{
6904	int i;
6905	struct sctp_tmit_chunk *tp1;
6906
6907	for (i = 0; i < bundle_at; i++) {
6908		/* off of the send queue */
6909		TAILQ_REMOVE(&asoc->send_queue, data_list[i], sctp_next);
6910		asoc->send_queue_cnt--;
6911		if (i > 0) {
6912			/*
6913			 * Any chunk NOT 0 you zap the time chunk 0 gets
6914			 * zapped or set based on if a RTO measurment is
6915			 * needed.
6916			 */
6917			data_list[i]->do_rtt = 0;
6918		}
6919		/* record time */
6920		data_list[i]->sent_rcv_time = net->last_sent_time;
6921		data_list[i]->rec.data.cwnd_at_send = net->cwnd;
6922		data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.TSN_seq;
6923		if (data_list[i]->whoTo == NULL) {
6924			data_list[i]->whoTo = net;
6925			atomic_add_int(&net->ref_count, 1);
6926		}
6927		/* on to the sent queue */
6928		tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
6929		if ((tp1) && SCTP_TSN_GT(tp1->rec.data.TSN_seq, data_list[i]->rec.data.TSN_seq)) {
6930			struct sctp_tmit_chunk *tpp;
6931
6932			/* need to move back */
6933	back_up_more:
6934			tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
6935			if (tpp == NULL) {
6936				TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
6937				goto all_done;
6938			}
6939			tp1 = tpp;
6940			if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, data_list[i]->rec.data.TSN_seq)) {
6941				goto back_up_more;
6942			}
6943			TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
6944		} else {
6945			TAILQ_INSERT_TAIL(&asoc->sent_queue,
6946			    data_list[i],
6947			    sctp_next);
6948		}
6949all_done:
6950		/* This does not lower until the cum-ack passes it */
6951		asoc->sent_queue_cnt++;
6952		if ((asoc->peers_rwnd <= 0) &&
6953		    (asoc->total_flight == 0) &&
6954		    (bundle_at == 1)) {
6955			/* Mark the chunk as being a window probe */
6956			SCTP_STAT_INCR(sctps_windowprobed);
6957		}
6958#ifdef SCTP_AUDITING_ENABLED
6959		sctp_audit_log(0xC2, 3);
6960#endif
6961		data_list[i]->sent = SCTP_DATAGRAM_SENT;
6962		data_list[i]->snd_count = 1;
6963		data_list[i]->rec.data.chunk_was_revoked = 0;
6964		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
6965			sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
6966			    data_list[i]->whoTo->flight_size,
6967			    data_list[i]->book_size,
6968			    (uintptr_t) data_list[i]->whoTo,
6969			    data_list[i]->rec.data.TSN_seq);
6970		}
6971		sctp_flight_size_increase(data_list[i]);
6972		sctp_total_flight_increase(stcb, data_list[i]);
6973		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
6974			sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
6975			    asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
6976		}
6977		asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
6978		    (uint32_t) (data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
6979		if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
6980			/* SWS sender side engages */
6981			asoc->peers_rwnd = 0;
6982		}
6983	}
6984	if (asoc->cc_functions.sctp_cwnd_update_packet_transmitted) {
6985		(*asoc->cc_functions.sctp_cwnd_update_packet_transmitted) (stcb, net);
6986	}
6987}
6988
6989static void
6990sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc, int so_locked
6991#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6992    SCTP_UNUSED
6993#endif
6994)
6995{
6996	struct sctp_tmit_chunk *chk, *nchk;
6997
6998	TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6999		if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7000		    (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||	/* EY */
7001		    (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
7002		    (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
7003		    (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) ||
7004		    (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
7005		    (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
7006		    (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
7007		    (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
7008		    (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
7009		    (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
7010		    (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
7011			/* Stray chunks must be cleaned up */
7012	clean_up_anyway:
7013			TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
7014			if (chk->data) {
7015				sctp_m_freem(chk->data);
7016				chk->data = NULL;
7017			}
7018			asoc->ctrl_queue_cnt--;
7019			if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)
7020				asoc->fwd_tsn_cnt--;
7021			sctp_free_a_chunk(stcb, chk, so_locked);
7022		} else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
7023			/* special handling, we must look into the param */
7024			if (chk != asoc->str_reset) {
7025				goto clean_up_anyway;
7026			}
7027		}
7028	}
7029}
7030
7031
7032static int
7033sctp_can_we_split_this(struct sctp_tcb *stcb,
7034    uint32_t length,
7035    uint32_t goal_mtu, uint32_t frag_point, int eeor_on)
7036{
7037	/*
7038	 * Make a decision on if I should split a msg into multiple parts.
7039	 * This is only asked of incomplete messages.
7040	 */
7041	if (eeor_on) {
7042		/*
7043		 * If we are doing EEOR we need to always send it if its the
7044		 * entire thing, since it might be all the guy is putting in
7045		 * the hopper.
7046		 */
7047		if (goal_mtu >= length) {
7048			/*-
7049			 * If we have data outstanding,
7050			 * we get another chance when the sack
7051			 * arrives to transmit - wait for more data
7052			 */
7053			if (stcb->asoc.total_flight == 0) {
7054				/*
7055				 * If nothing is in flight, we zero the
7056				 * packet counter.
7057				 */
7058				return (length);
7059			}
7060			return (0);
7061
7062		} else {
7063			/* You can fill the rest */
7064			return (goal_mtu);
7065		}
7066	}
7067	/*-
7068	 * For those strange folk that make the send buffer
7069	 * smaller than our fragmentation point, we can't
7070	 * get a full msg in so we have to allow splitting.
7071	 */
7072	if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
7073		return (length);
7074	}
7075	if ((length <= goal_mtu) ||
7076	    ((length - goal_mtu) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
7077		/* Sub-optimial residual don't split in non-eeor mode. */
7078		return (0);
7079	}
7080	/*
7081	 * If we reach here length is larger than the goal_mtu. Do we wish
7082	 * to split it for the sake of packet putting together?
7083	 */
7084	if (goal_mtu >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
7085		/* Its ok to split it */
7086		return (min(goal_mtu, frag_point));
7087	}
7088	/* Nope, can't split */
7089	return (0);
7090
7091}
7092
7093static uint32_t
7094sctp_move_to_outqueue(struct sctp_tcb *stcb,
7095    struct sctp_stream_out *strq,
7096    uint32_t goal_mtu,
7097    uint32_t frag_point,
7098    int *locked,
7099    int *giveup,
7100    int eeor_mode,
7101    int *bail,
7102    int so_locked
7103#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7104    SCTP_UNUSED
7105#endif
7106)
7107{
7108	/* Move from the stream to the send_queue keeping track of the total */
7109	struct sctp_association *asoc;
7110	struct sctp_stream_queue_pending *sp;
7111	struct sctp_tmit_chunk *chk;
7112	struct sctp_data_chunk *dchkh;
7113	uint32_t to_move, length;
7114	uint8_t rcv_flags = 0;
7115	uint8_t some_taken;
7116	uint8_t send_lock_up = 0;
7117
7118	SCTP_TCB_LOCK_ASSERT(stcb);
7119	asoc = &stcb->asoc;
7120one_more_time:
7121	/* sa_ignore FREED_MEMORY */
7122	sp = TAILQ_FIRST(&strq->outqueue);
7123	if (sp == NULL) {
7124		*locked = 0;
7125		if (send_lock_up == 0) {
7126			SCTP_TCB_SEND_LOCK(stcb);
7127			send_lock_up = 1;
7128		}
7129		sp = TAILQ_FIRST(&strq->outqueue);
7130		if (sp) {
7131			goto one_more_time;
7132		}
7133		if (strq->last_msg_incomplete) {
7134			SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
7135			    strq->stream_no,
7136			    strq->last_msg_incomplete);
7137			strq->last_msg_incomplete = 0;
7138		}
7139		to_move = 0;
7140		if (send_lock_up) {
7141			SCTP_TCB_SEND_UNLOCK(stcb);
7142			send_lock_up = 0;
7143		}
7144		goto out_of;
7145	}
7146	if ((sp->msg_is_complete) && (sp->length == 0)) {
7147		if (sp->sender_all_done) {
7148			/*
7149			 * We are doing differed cleanup. Last time through
7150			 * when we took all the data the sender_all_done was
7151			 * not set.
7152			 */
7153			if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
7154				SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
7155				SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7156				    sp->sender_all_done,
7157				    sp->length,
7158				    sp->msg_is_complete,
7159				    sp->put_last_out,
7160				    send_lock_up);
7161			}
7162			if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
7163				SCTP_TCB_SEND_LOCK(stcb);
7164				send_lock_up = 1;
7165			}
7166			atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7167			TAILQ_REMOVE(&strq->outqueue, sp, next);
7168			stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7169			if (sp->net) {
7170				sctp_free_remote_addr(sp->net);
7171				sp->net = NULL;
7172			}
7173			if (sp->data) {
7174				sctp_m_freem(sp->data);
7175				sp->data = NULL;
7176			}
7177			sctp_free_a_strmoq(stcb, sp, so_locked);
7178			/* we can't be locked to it */
7179			*locked = 0;
7180			stcb->asoc.locked_on_sending = NULL;
7181			if (send_lock_up) {
7182				SCTP_TCB_SEND_UNLOCK(stcb);
7183				send_lock_up = 0;
7184			}
7185			/* back to get the next msg */
7186			goto one_more_time;
7187		} else {
7188			/*
7189			 * sender just finished this but still holds a
7190			 * reference
7191			 */
7192			*locked = 1;
7193			*giveup = 1;
7194			to_move = 0;
7195			goto out_of;
7196		}
7197	} else {
7198		/* is there some to get */
7199		if (sp->length == 0) {
7200			/* no */
7201			*locked = 1;
7202			*giveup = 1;
7203			to_move = 0;
7204			goto out_of;
7205		} else if (sp->discard_rest) {
7206			if (send_lock_up == 0) {
7207				SCTP_TCB_SEND_LOCK(stcb);
7208				send_lock_up = 1;
7209			}
7210			/* Whack down the size */
7211			atomic_subtract_int(&stcb->asoc.total_output_queue_size, sp->length);
7212			if ((stcb->sctp_socket != NULL) && \
7213			    ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
7214			    (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) {
7215				atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc, sp->length);
7216			}
7217			if (sp->data) {
7218				sctp_m_freem(sp->data);
7219				sp->data = NULL;
7220				sp->tail_mbuf = NULL;
7221			}
7222			sp->length = 0;
7223			sp->some_taken = 1;
7224			*locked = 1;
7225			*giveup = 1;
7226			to_move = 0;
7227			goto out_of;
7228		}
7229	}
7230	some_taken = sp->some_taken;
7231	if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
7232		sp->msg_is_complete = 1;
7233	}
7234re_look:
7235	length = sp->length;
7236	if (sp->msg_is_complete) {
7237		/* The message is complete */
7238		to_move = min(length, frag_point);
7239		if (to_move == length) {
7240			/* All of it fits in the MTU */
7241			if (sp->some_taken) {
7242				rcv_flags |= SCTP_DATA_LAST_FRAG;
7243				sp->put_last_out = 1;
7244			} else {
7245				rcv_flags |= SCTP_DATA_NOT_FRAG;
7246				sp->put_last_out = 1;
7247			}
7248		} else {
7249			/* Not all of it fits, we fragment */
7250			if (sp->some_taken == 0) {
7251				rcv_flags |= SCTP_DATA_FIRST_FRAG;
7252			}
7253			sp->some_taken = 1;
7254		}
7255	} else {
7256		to_move = sctp_can_we_split_this(stcb, length, goal_mtu, frag_point, eeor_mode);
7257		if (to_move) {
7258			/*-
7259			 * We use a snapshot of length in case it
7260			 * is expanding during the compare.
7261			 */
7262			uint32_t llen;
7263
7264			llen = length;
7265			if (to_move >= llen) {
7266				to_move = llen;
7267				if (send_lock_up == 0) {
7268					/*-
7269					 * We are taking all of an incomplete msg
7270					 * thus we need a send lock.
7271					 */
7272					SCTP_TCB_SEND_LOCK(stcb);
7273					send_lock_up = 1;
7274					if (sp->msg_is_complete) {
7275						/*
7276						 * the sender finished the
7277						 * msg
7278						 */
7279						goto re_look;
7280					}
7281				}
7282			}
7283			if (sp->some_taken == 0) {
7284				rcv_flags |= SCTP_DATA_FIRST_FRAG;
7285				sp->some_taken = 1;
7286			}
7287		} else {
7288			/* Nothing to take. */
7289			if (sp->some_taken) {
7290				*locked = 1;
7291			}
7292			*giveup = 1;
7293			to_move = 0;
7294			goto out_of;
7295		}
7296	}
7297
7298	/* If we reach here, we can copy out a chunk */
7299	sctp_alloc_a_chunk(stcb, chk);
7300	if (chk == NULL) {
7301		/* No chunk memory */
7302		*giveup = 1;
7303		to_move = 0;
7304		goto out_of;
7305	}
7306	/*
7307	 * Setup for unordered if needed by looking at the user sent info
7308	 * flags.
7309	 */
7310	if (sp->sinfo_flags & SCTP_UNORDERED) {
7311		rcv_flags |= SCTP_DATA_UNORDERED;
7312	}
7313	if ((SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) && ((sp->sinfo_flags & SCTP_EOF) == SCTP_EOF)) ||
7314	    ((sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) == SCTP_SACK_IMMEDIATELY)) {
7315		rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7316	}
7317	/* clear out the chunk before setting up */
7318	memset(chk, 0, sizeof(*chk));
7319	chk->rec.data.rcv_flags = rcv_flags;
7320
7321	if (to_move >= length) {
7322		/* we think we can steal the whole thing */
7323		if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
7324			SCTP_TCB_SEND_LOCK(stcb);
7325			send_lock_up = 1;
7326		}
7327		if (to_move < sp->length) {
7328			/* bail, it changed */
7329			goto dont_do_it;
7330		}
7331		chk->data = sp->data;
7332		chk->last_mbuf = sp->tail_mbuf;
7333		/* register the stealing */
7334		sp->data = sp->tail_mbuf = NULL;
7335	} else {
7336		struct mbuf *m;
7337
7338dont_do_it:
7339		chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_NOWAIT);
7340		chk->last_mbuf = NULL;
7341		if (chk->data == NULL) {
7342			sp->some_taken = some_taken;
7343			sctp_free_a_chunk(stcb, chk, so_locked);
7344			*bail = 1;
7345			to_move = 0;
7346			goto out_of;
7347		}
7348#ifdef SCTP_MBUF_LOGGING
7349		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
7350			sctp_log_mbc(chk->data, SCTP_MBUF_ICOPY);
7351		}
7352#endif
7353		/* Pull off the data */
7354		m_adj(sp->data, to_move);
7355		/* Now lets work our way down and compact it */
7356		m = sp->data;
7357		while (m && (SCTP_BUF_LEN(m) == 0)) {
7358			sp->data = SCTP_BUF_NEXT(m);
7359			SCTP_BUF_NEXT(m) = NULL;
7360			if (sp->tail_mbuf == m) {
7361				/*-
7362				 * Freeing tail? TSNH since
7363				 * we supposedly were taking less
7364				 * than the sp->length.
7365				 */
7366#ifdef INVARIANTS
7367				panic("Huh, freing tail? - TSNH");
7368#else
7369				SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
7370				sp->tail_mbuf = sp->data = NULL;
7371				sp->length = 0;
7372#endif
7373
7374			}
7375			sctp_m_free(m);
7376			m = sp->data;
7377		}
7378	}
7379	if (SCTP_BUF_IS_EXTENDED(chk->data)) {
7380		chk->copy_by_ref = 1;
7381	} else {
7382		chk->copy_by_ref = 0;
7383	}
7384	/*
7385	 * get last_mbuf and counts of mb useage This is ugly but hopefully
7386	 * its only one mbuf.
7387	 */
7388	if (chk->last_mbuf == NULL) {
7389		chk->last_mbuf = chk->data;
7390		while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
7391			chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
7392		}
7393	}
7394	if (to_move > length) {
7395		/*- This should not happen either
7396		 * since we always lower to_move to the size
7397		 * of sp->length if its larger.
7398		 */
7399#ifdef INVARIANTS
7400		panic("Huh, how can to_move be larger?");
7401#else
7402		SCTP_PRINTF("Huh, how can to_move be larger?\n");
7403		sp->length = 0;
7404#endif
7405	} else {
7406		atomic_subtract_int(&sp->length, to_move);
7407	}
7408	if (M_LEADINGSPACE(chk->data) < (int)sizeof(struct sctp_data_chunk)) {
7409		/* Not enough room for a chunk header, get some */
7410		struct mbuf *m;
7411
7412		m = sctp_get_mbuf_for_msg(1, 0, M_NOWAIT, 0, MT_DATA);
7413		if (m == NULL) {
7414			/*
7415			 * we're in trouble here. _PREPEND below will free
7416			 * all the data if there is no leading space, so we
7417			 * must put the data back and restore.
7418			 */
7419			if (send_lock_up == 0) {
7420				SCTP_TCB_SEND_LOCK(stcb);
7421				send_lock_up = 1;
7422			}
7423			if (sp->data == NULL) {
7424				/* unsteal the data */
7425				sp->data = chk->data;
7426				sp->tail_mbuf = chk->last_mbuf;
7427			} else {
7428				struct mbuf *m_tmp;
7429
7430				/* reassemble the data */
7431				m_tmp = sp->data;
7432				sp->data = chk->data;
7433				SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
7434			}
7435			sp->some_taken = some_taken;
7436			atomic_add_int(&sp->length, to_move);
7437			chk->data = NULL;
7438			*bail = 1;
7439			sctp_free_a_chunk(stcb, chk, so_locked);
7440			to_move = 0;
7441			goto out_of;
7442		} else {
7443			SCTP_BUF_LEN(m) = 0;
7444			SCTP_BUF_NEXT(m) = chk->data;
7445			chk->data = m;
7446			M_ALIGN(chk->data, 4);
7447		}
7448	}
7449	SCTP_BUF_PREPEND(chk->data, sizeof(struct sctp_data_chunk), M_NOWAIT);
7450	if (chk->data == NULL) {
7451		/* HELP, TSNH since we assured it would not above? */
7452#ifdef INVARIANTS
7453		panic("prepend failes HELP?");
7454#else
7455		SCTP_PRINTF("prepend fails HELP?\n");
7456		sctp_free_a_chunk(stcb, chk, so_locked);
7457#endif
7458		*bail = 1;
7459		to_move = 0;
7460		goto out_of;
7461	}
7462	sctp_snd_sb_alloc(stcb, sizeof(struct sctp_data_chunk));
7463	chk->book_size = chk->send_size = (to_move + sizeof(struct sctp_data_chunk));
7464	chk->book_size_scale = 0;
7465	chk->sent = SCTP_DATAGRAM_UNSENT;
7466
7467	chk->flags = 0;
7468	chk->asoc = &stcb->asoc;
7469	chk->pad_inplace = 0;
7470	chk->no_fr_allowed = 0;
7471	chk->rec.data.stream_seq = strq->next_sequence_send;
7472	if ((rcv_flags & SCTP_DATA_LAST_FRAG) &&
7473	    !(rcv_flags & SCTP_DATA_UNORDERED)) {
7474		strq->next_sequence_send++;
7475	}
7476	chk->rec.data.stream_number = sp->stream;
7477	chk->rec.data.payloadtype = sp->ppid;
7478	chk->rec.data.context = sp->context;
7479	chk->rec.data.doing_fast_retransmit = 0;
7480
7481	chk->rec.data.timetodrop = sp->ts;
7482	chk->flags = sp->act_flags;
7483
7484	if (sp->net) {
7485		chk->whoTo = sp->net;
7486		atomic_add_int(&chk->whoTo->ref_count, 1);
7487	} else
7488		chk->whoTo = NULL;
7489
7490	if (sp->holds_key_ref) {
7491		chk->auth_keyid = sp->auth_keyid;
7492		sctp_auth_key_acquire(stcb, chk->auth_keyid);
7493		chk->holds_key_ref = 1;
7494	}
7495	chk->rec.data.TSN_seq = atomic_fetchadd_int(&asoc->sending_seq, 1);
7496	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
7497		sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
7498		    (uintptr_t) stcb, sp->length,
7499		    (uint32_t) ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq),
7500		    chk->rec.data.TSN_seq);
7501	}
7502	dchkh = mtod(chk->data, struct sctp_data_chunk *);
7503	/*
7504	 * Put the rest of the things in place now. Size was done earlier in
7505	 * previous loop prior to padding.
7506	 */
7507
7508#ifdef SCTP_ASOCLOG_OF_TSNS
7509	SCTP_TCB_LOCK_ASSERT(stcb);
7510	if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
7511		asoc->tsn_out_at = 0;
7512		asoc->tsn_out_wrapped = 1;
7513	}
7514	asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.TSN_seq;
7515	asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.stream_number;
7516	asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.stream_seq;
7517	asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
7518	asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
7519	asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
7520	asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
7521	asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
7522	asoc->tsn_out_at++;
7523#endif
7524
7525	dchkh->ch.chunk_type = SCTP_DATA;
7526	dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7527	dchkh->dp.tsn = htonl(chk->rec.data.TSN_seq);
7528	dchkh->dp.stream_id = htons(strq->stream_no);
7529	dchkh->dp.stream_sequence = htons(chk->rec.data.stream_seq);
7530	dchkh->dp.protocol_id = chk->rec.data.payloadtype;
7531	dchkh->ch.chunk_length = htons(chk->send_size);
7532	/* Now advance the chk->send_size by the actual pad needed. */
7533	if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
7534		/* need a pad */
7535		struct mbuf *lm;
7536		int pads;
7537
7538		pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
7539		lm = sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf);
7540		if (lm != NULL) {
7541			chk->last_mbuf = lm;
7542			chk->pad_inplace = 1;
7543		}
7544		chk->send_size += pads;
7545	}
7546	if (PR_SCTP_ENABLED(chk->flags)) {
7547		asoc->pr_sctp_cnt++;
7548	}
7549	if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
7550		/* All done pull and kill the message */
7551		atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7552		if (sp->put_last_out == 0) {
7553			SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
7554			SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7555			    sp->sender_all_done,
7556			    sp->length,
7557			    sp->msg_is_complete,
7558			    sp->put_last_out,
7559			    send_lock_up);
7560		}
7561		if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
7562			SCTP_TCB_SEND_LOCK(stcb);
7563			send_lock_up = 1;
7564		}
7565		TAILQ_REMOVE(&strq->outqueue, sp, next);
7566		stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7567		if (sp->net) {
7568			sctp_free_remote_addr(sp->net);
7569			sp->net = NULL;
7570		}
7571		if (sp->data) {
7572			sctp_m_freem(sp->data);
7573			sp->data = NULL;
7574		}
7575		sctp_free_a_strmoq(stcb, sp, so_locked);
7576
7577		/* we can't be locked to it */
7578		*locked = 0;
7579		stcb->asoc.locked_on_sending = NULL;
7580	} else {
7581		/* more to go, we are locked */
7582		*locked = 1;
7583	}
7584	asoc->chunks_on_out_queue++;
7585	strq->chunks_on_queues++;
7586	TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
7587	asoc->send_queue_cnt++;
7588out_of:
7589	if (send_lock_up) {
7590		SCTP_TCB_SEND_UNLOCK(stcb);
7591	}
7592	return (to_move);
7593}
7594
7595
7596static void
7597sctp_fill_outqueue(struct sctp_tcb *stcb,
7598    struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now, int so_locked
7599#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7600    SCTP_UNUSED
7601#endif
7602)
7603{
7604	struct sctp_association *asoc;
7605	struct sctp_stream_out *strq;
7606	int goal_mtu, moved_how_much, total_moved = 0, bail = 0;
7607	int locked, giveup;
7608
7609	SCTP_TCB_LOCK_ASSERT(stcb);
7610	asoc = &stcb->asoc;
7611	switch (net->ro._l_addr.sa.sa_family) {
7612#ifdef INET
7613	case AF_INET:
7614		goal_mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
7615		break;
7616#endif
7617#ifdef INET6
7618	case AF_INET6:
7619		goal_mtu = net->mtu - SCTP_MIN_OVERHEAD;
7620		break;
7621#endif
7622	default:
7623		/* TSNH */
7624		goal_mtu = net->mtu;
7625		break;
7626	}
7627	/* Need an allowance for the data chunk header too */
7628	goal_mtu -= sizeof(struct sctp_data_chunk);
7629
7630	/* must make even word boundary */
7631	goal_mtu &= 0xfffffffc;
7632	if (asoc->locked_on_sending) {
7633		/* We are stuck on one stream until the message completes. */
7634		strq = asoc->locked_on_sending;
7635		locked = 1;
7636	} else {
7637		strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7638		locked = 0;
7639	}
7640	while ((goal_mtu > 0) && strq) {
7641		giveup = 0;
7642		bail = 0;
7643		moved_how_much = sctp_move_to_outqueue(stcb, strq, goal_mtu, frag_point, &locked,
7644		    &giveup, eeor_mode, &bail, so_locked);
7645		if (moved_how_much)
7646			stcb->asoc.ss_functions.sctp_ss_scheduled(stcb, net, asoc, strq, moved_how_much);
7647
7648		if (locked) {
7649			asoc->locked_on_sending = strq;
7650			if ((moved_how_much == 0) || (giveup) || bail)
7651				/* no more to move for now */
7652				break;
7653		} else {
7654			asoc->locked_on_sending = NULL;
7655			if ((giveup) || bail) {
7656				break;
7657			}
7658			strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7659			if (strq == NULL) {
7660				break;
7661			}
7662		}
7663		total_moved += moved_how_much;
7664		goal_mtu -= (moved_how_much + sizeof(struct sctp_data_chunk));
7665		goal_mtu &= 0xfffffffc;
7666	}
7667	if (bail)
7668		*quit_now = 1;
7669
7670	stcb->asoc.ss_functions.sctp_ss_packet_done(stcb, net, asoc);
7671
7672	if (total_moved == 0) {
7673		if ((stcb->asoc.sctp_cmt_on_off == 0) &&
7674		    (net == stcb->asoc.primary_destination)) {
7675			/* ran dry for primary network net */
7676			SCTP_STAT_INCR(sctps_primary_randry);
7677		} else if (stcb->asoc.sctp_cmt_on_off > 0) {
7678			/* ran dry with CMT on */
7679			SCTP_STAT_INCR(sctps_cmt_randry);
7680		}
7681	}
7682}
7683
7684void
7685sctp_fix_ecn_echo(struct sctp_association *asoc)
7686{
7687	struct sctp_tmit_chunk *chk;
7688
7689	TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7690		if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7691			chk->sent = SCTP_DATAGRAM_UNSENT;
7692		}
7693	}
7694}
7695
7696void
7697sctp_move_chunks_from_net(struct sctp_tcb *stcb, struct sctp_nets *net)
7698{
7699	struct sctp_association *asoc;
7700	struct sctp_tmit_chunk *chk;
7701	struct sctp_stream_queue_pending *sp;
7702	unsigned int i;
7703
7704	if (net == NULL) {
7705		return;
7706	}
7707	asoc = &stcb->asoc;
7708	for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
7709		TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
7710			if (sp->net == net) {
7711				sctp_free_remote_addr(sp->net);
7712				sp->net = NULL;
7713			}
7714		}
7715	}
7716	TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7717		if (chk->whoTo == net) {
7718			sctp_free_remote_addr(chk->whoTo);
7719			chk->whoTo = NULL;
7720		}
7721	}
7722}
7723
7724int
7725sctp_med_chunk_output(struct sctp_inpcb *inp,
7726    struct sctp_tcb *stcb,
7727    struct sctp_association *asoc,
7728    int *num_out,
7729    int *reason_code,
7730    int control_only, int from_where,
7731    struct timeval *now, int *now_filled, int frag_point, int so_locked
7732#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7733    SCTP_UNUSED
7734#endif
7735)
7736{
7737	/**
7738	 * Ok this is the generic chunk service queue. we must do the
7739	 * following: - Service the stream queue that is next, moving any
7740	 * message (note I must get a complete message i.e. FIRST/MIDDLE and
7741	 * LAST to the out queue in one pass) and assigning TSN's - Check to
7742	 * see if the cwnd/rwnd allows any output, if so we go ahead and
7743	 * fomulate and send the low level chunks. Making sure to combine
7744	 * any control in the control chunk queue also.
7745	 */
7746	struct sctp_nets *net, *start_at, *sack_goes_to = NULL, *old_start_at = NULL;
7747	struct mbuf *outchain, *endoutchain;
7748	struct sctp_tmit_chunk *chk, *nchk;
7749
7750	/* temp arrays for unlinking */
7751	struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
7752	int no_fragmentflg, error;
7753	unsigned int max_rwnd_per_dest, max_send_per_dest;
7754	int one_chunk, hbflag, skip_data_for_this_net;
7755	int asconf, cookie, no_out_cnt;
7756	int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
7757	unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
7758	int tsns_sent = 0;
7759	uint32_t auth_offset = 0;
7760	struct sctp_auth_chunk *auth = NULL;
7761	uint16_t auth_keyid;
7762	int override_ok = 1;
7763	int skip_fill_up = 0;
7764	int data_auth_reqd = 0;
7765
7766	/*
7767	 * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
7768	 * destination.
7769	 */
7770	int quit_now = 0;
7771
7772	*num_out = 0;
7773	*reason_code = 0;
7774	auth_keyid = stcb->asoc.authinfo.active_keyid;
7775	if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
7776	    (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED) ||
7777	    (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
7778		eeor_mode = 1;
7779	} else {
7780		eeor_mode = 0;
7781	}
7782	ctl_cnt = no_out_cnt = asconf = cookie = 0;
7783	/*
7784	 * First lets prime the pump. For each destination, if there is room
7785	 * in the flight size, attempt to pull an MTU's worth out of the
7786	 * stream queues into the general send_queue
7787	 */
7788#ifdef SCTP_AUDITING_ENABLED
7789	sctp_audit_log(0xC2, 2);
7790#endif
7791	SCTP_TCB_LOCK_ASSERT(stcb);
7792	hbflag = 0;
7793	if ((control_only) || (asoc->stream_reset_outstanding))
7794		no_data_chunks = 1;
7795	else
7796		no_data_chunks = 0;
7797
7798	/* Nothing to possible to send? */
7799	if ((TAILQ_EMPTY(&asoc->control_send_queue) ||
7800	    (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) &&
7801	    TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7802	    TAILQ_EMPTY(&asoc->send_queue) &&
7803	    stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
7804nothing_to_send:
7805		*reason_code = 9;
7806		return (0);
7807	}
7808	if (asoc->peers_rwnd == 0) {
7809		/* No room in peers rwnd */
7810		*reason_code = 1;
7811		if (asoc->total_flight > 0) {
7812			/* we are allowed one chunk in flight */
7813			no_data_chunks = 1;
7814		}
7815	}
7816	if (stcb->asoc.ecn_echo_cnt_onq) {
7817		/* Record where a sack goes, if any */
7818		if (no_data_chunks &&
7819		    (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) {
7820			/* Nothing but ECNe to send - we don't do that */
7821			goto nothing_to_send;
7822		}
7823		TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7824			if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7825			    (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
7826				sack_goes_to = chk->whoTo;
7827				break;
7828			}
7829		}
7830	}
7831	max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
7832	if (stcb->sctp_socket)
7833		max_send_per_dest = SCTP_SB_LIMIT_SND(stcb->sctp_socket) / asoc->numnets;
7834	else
7835		max_send_per_dest = 0;
7836	if (no_data_chunks == 0) {
7837		/* How many non-directed chunks are there? */
7838		TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7839			if (chk->whoTo == NULL) {
7840				/*
7841				 * We already have non-directed chunks on
7842				 * the queue, no need to do a fill-up.
7843				 */
7844				skip_fill_up = 1;
7845				break;
7846			}
7847		}
7848
7849	}
7850	if ((no_data_chunks == 0) &&
7851	    (skip_fill_up == 0) &&
7852	    (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc))) {
7853		TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
7854			/*
7855			 * This for loop we are in takes in each net, if
7856			 * its's got space in cwnd and has data sent to it
7857			 * (when CMT is off) then it calls
7858			 * sctp_fill_outqueue for the net. This gets data on
7859			 * the send queue for that network.
7860			 *
7861			 * In sctp_fill_outqueue TSN's are assigned and data is
7862			 * copied out of the stream buffers. Note mostly
7863			 * copy by reference (we hope).
7864			 */
7865			net->window_probe = 0;
7866			if ((net != stcb->asoc.alternate) &&
7867			    ((net->dest_state & SCTP_ADDR_PF) ||
7868			    (!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
7869			    (net->dest_state & SCTP_ADDR_UNCONFIRMED))) {
7870				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7871					sctp_log_cwnd(stcb, net, 1,
7872					    SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7873				}
7874				continue;
7875			}
7876			if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
7877			    (net->flight_size == 0)) {
7878				(*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
7879			}
7880			if (net->flight_size >= net->cwnd) {
7881				/* skip this network, no room - can't fill */
7882				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7883					sctp_log_cwnd(stcb, net, 3,
7884					    SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7885				}
7886				continue;
7887			}
7888			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7889				sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7890			}
7891			sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now, so_locked);
7892			if (quit_now) {
7893				/* memory alloc failure */
7894				no_data_chunks = 1;
7895				break;
7896			}
7897		}
7898	}
7899	/* now service each destination and send out what we can for it */
7900	/* Nothing to send? */
7901	if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7902	    TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7903	    TAILQ_EMPTY(&asoc->send_queue)) {
7904		*reason_code = 8;
7905		return (0);
7906	}
7907	if (asoc->sctp_cmt_on_off > 0) {
7908		/* get the last start point */
7909		start_at = asoc->last_net_cmt_send_started;
7910		if (start_at == NULL) {
7911			/* null so to beginning */
7912			start_at = TAILQ_FIRST(&asoc->nets);
7913		} else {
7914			start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
7915			if (start_at == NULL) {
7916				start_at = TAILQ_FIRST(&asoc->nets);
7917			}
7918		}
7919		asoc->last_net_cmt_send_started = start_at;
7920	} else {
7921		start_at = TAILQ_FIRST(&asoc->nets);
7922	}
7923	TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7924		if (chk->whoTo == NULL) {
7925			if (asoc->alternate) {
7926				chk->whoTo = asoc->alternate;
7927			} else {
7928				chk->whoTo = asoc->primary_destination;
7929			}
7930			atomic_add_int(&chk->whoTo->ref_count, 1);
7931		}
7932	}
7933	old_start_at = NULL;
7934again_one_more_time:
7935	for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
7936		/* how much can we send? */
7937		/* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
7938		if (old_start_at && (old_start_at == net)) {
7939			/* through list ocmpletely. */
7940			break;
7941		}
7942		tsns_sent = 0xa;
7943		if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7944		    TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7945		    (net->flight_size >= net->cwnd)) {
7946			/*
7947			 * Nothing on control or asconf and flight is full,
7948			 * we can skip even in the CMT case.
7949			 */
7950			continue;
7951		}
7952		bundle_at = 0;
7953		endoutchain = outchain = NULL;
7954		no_fragmentflg = 1;
7955		one_chunk = 0;
7956		if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
7957			skip_data_for_this_net = 1;
7958		} else {
7959			skip_data_for_this_net = 0;
7960		}
7961		if ((net->ro.ro_rt) && (net->ro.ro_rt->rt_ifp)) {
7962			/*
7963			 * if we have a route and an ifp check to see if we
7964			 * have room to send to this guy
7965			 */
7966			struct ifnet *ifp;
7967
7968			ifp = net->ro.ro_rt->rt_ifp;
7969			if ((ifp->if_snd.ifq_len + 2) >= ifp->if_snd.ifq_maxlen) {
7970				SCTP_STAT_INCR(sctps_ifnomemqueued);
7971				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
7972					sctp_log_maxburst(stcb, net, ifp->if_snd.ifq_len, ifp->if_snd.ifq_maxlen, SCTP_MAX_IFP_APPLIED);
7973				}
7974				continue;
7975			}
7976		}
7977		switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
7978#ifdef INET
7979		case AF_INET:
7980			mtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
7981			break;
7982#endif
7983#ifdef INET6
7984		case AF_INET6:
7985			mtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
7986			break;
7987#endif
7988		default:
7989			/* TSNH */
7990			mtu = net->mtu;
7991			break;
7992		}
7993		mx_mtu = mtu;
7994		to_out = 0;
7995		if (mtu > asoc->peers_rwnd) {
7996			if (asoc->total_flight > 0) {
7997				/* We have a packet in flight somewhere */
7998				r_mtu = asoc->peers_rwnd;
7999			} else {
8000				/* We are always allowed to send one MTU out */
8001				one_chunk = 1;
8002				r_mtu = mtu;
8003			}
8004		} else {
8005			r_mtu = mtu;
8006		}
8007		/************************/
8008		/* ASCONF transmission */
8009		/************************/
8010		/* Now first lets go through the asconf queue */
8011		TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
8012			if (chk->rec.chunk_id.id != SCTP_ASCONF) {
8013				continue;
8014			}
8015			if (chk->whoTo == NULL) {
8016				if (asoc->alternate == NULL) {
8017					if (asoc->primary_destination != net) {
8018						break;
8019					}
8020				} else {
8021					if (asoc->alternate != net) {
8022						break;
8023					}
8024				}
8025			} else {
8026				if (chk->whoTo != net) {
8027					break;
8028				}
8029			}
8030			if (chk->data == NULL) {
8031				break;
8032			}
8033			if (chk->sent != SCTP_DATAGRAM_UNSENT &&
8034			    chk->sent != SCTP_DATAGRAM_RESEND) {
8035				break;
8036			}
8037			/*
8038			 * if no AUTH is yet included and this chunk
8039			 * requires it, make sure to account for it.  We
8040			 * don't apply the size until the AUTH chunk is
8041			 * actually added below in case there is no room for
8042			 * this chunk. NOTE: we overload the use of "omtu"
8043			 * here
8044			 */
8045			if ((auth == NULL) &&
8046			    sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8047			    stcb->asoc.peer_auth_chunks)) {
8048				omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8049			} else
8050				omtu = 0;
8051			/* Here we do NOT factor the r_mtu */
8052			if ((chk->send_size < (int)(mtu - omtu)) ||
8053			    (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8054				/*
8055				 * We probably should glom the mbuf chain
8056				 * from the chk->data for control but the
8057				 * problem is it becomes yet one more level
8058				 * of tracking to do if for some reason
8059				 * output fails. Then I have got to
8060				 * reconstruct the merged control chain.. el
8061				 * yucko.. for now we take the easy way and
8062				 * do the copy
8063				 */
8064				/*
8065				 * Add an AUTH chunk, if chunk requires it
8066				 * save the offset into the chain for AUTH
8067				 */
8068				if ((auth == NULL) &&
8069				    (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8070				    stcb->asoc.peer_auth_chunks))) {
8071					outchain = sctp_add_auth_chunk(outchain,
8072					    &endoutchain,
8073					    &auth,
8074					    &auth_offset,
8075					    stcb,
8076					    chk->rec.chunk_id.id);
8077					SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8078				}
8079				outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8080				    (int)chk->rec.chunk_id.can_take_data,
8081				    chk->send_size, chk->copy_by_ref);
8082				if (outchain == NULL) {
8083					*reason_code = 8;
8084					SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8085					return (ENOMEM);
8086				}
8087				SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8088				/* update our MTU size */
8089				if (mtu > (chk->send_size + omtu))
8090					mtu -= (chk->send_size + omtu);
8091				else
8092					mtu = 0;
8093				to_out += (chk->send_size + omtu);
8094				/* Do clear IP_DF ? */
8095				if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8096					no_fragmentflg = 0;
8097				}
8098				if (chk->rec.chunk_id.can_take_data)
8099					chk->data = NULL;
8100				/*
8101				 * set hb flag since we can use these for
8102				 * RTO
8103				 */
8104				hbflag = 1;
8105				asconf = 1;
8106				/*
8107				 * should sysctl this: don't bundle data
8108				 * with ASCONF since it requires AUTH
8109				 */
8110				no_data_chunks = 1;
8111				chk->sent = SCTP_DATAGRAM_SENT;
8112				if (chk->whoTo == NULL) {
8113					chk->whoTo = net;
8114					atomic_add_int(&net->ref_count, 1);
8115				}
8116				chk->snd_count++;
8117				if (mtu == 0) {
8118					/*
8119					 * Ok we are out of room but we can
8120					 * output without effecting the
8121					 * flight size since this little guy
8122					 * is a control only packet.
8123					 */
8124					sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8125					/*
8126					 * do NOT clear the asconf flag as
8127					 * it is used to do appropriate
8128					 * source address selection.
8129					 */
8130					if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8131					    (struct sockaddr *)&net->ro._l_addr,
8132					    outchain, auth_offset, auth,
8133					    stcb->asoc.authinfo.active_keyid,
8134					    no_fragmentflg, 0, asconf,
8135					    inp->sctp_lport, stcb->rport,
8136					    htonl(stcb->asoc.peer_vtag),
8137					    net->port, NULL,
8138					    0, 0,
8139					    so_locked))) {
8140						if (error == ENOBUFS) {
8141							asoc->ifp_had_enobuf = 1;
8142							SCTP_STAT_INCR(sctps_lowlevelerr);
8143						}
8144						if (from_where == 0) {
8145							SCTP_STAT_INCR(sctps_lowlevelerrusr);
8146						}
8147						if (*now_filled == 0) {
8148							(void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8149							*now_filled = 1;
8150							*now = net->last_sent_time;
8151						} else {
8152							net->last_sent_time = *now;
8153						}
8154						hbflag = 0;
8155						/* error, could not output */
8156						if (error == EHOSTUNREACH) {
8157							/*
8158							 * Destination went
8159							 * unreachable
8160							 * during this send
8161							 */
8162							sctp_move_chunks_from_net(stcb, net);
8163						}
8164						*reason_code = 7;
8165						continue;
8166					} else
8167						asoc->ifp_had_enobuf = 0;
8168					if (*now_filled == 0) {
8169						(void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8170						*now_filled = 1;
8171						*now = net->last_sent_time;
8172					} else {
8173						net->last_sent_time = *now;
8174					}
8175					hbflag = 0;
8176					/*
8177					 * increase the number we sent, if a
8178					 * cookie is sent we don't tell them
8179					 * any was sent out.
8180					 */
8181					outchain = endoutchain = NULL;
8182					auth = NULL;
8183					auth_offset = 0;
8184					if (!no_out_cnt)
8185						*num_out += ctl_cnt;
8186					/* recalc a clean slate and setup */
8187					switch (net->ro._l_addr.sa.sa_family) {
8188#ifdef INET
8189					case AF_INET:
8190						mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8191						break;
8192#endif
8193#ifdef INET6
8194					case AF_INET6:
8195						mtu = net->mtu - SCTP_MIN_OVERHEAD;
8196						break;
8197#endif
8198					default:
8199						/* TSNH */
8200						mtu = net->mtu;
8201						break;
8202					}
8203					to_out = 0;
8204					no_fragmentflg = 1;
8205				}
8206			}
8207		}
8208		/************************/
8209		/* Control transmission */
8210		/************************/
8211		/* Now first lets go through the control queue */
8212		TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
8213			if ((sack_goes_to) &&
8214			    (chk->rec.chunk_id.id == SCTP_ECN_ECHO) &&
8215			    (chk->whoTo != sack_goes_to)) {
8216				/*
8217				 * if we have a sack in queue, and we are
8218				 * looking at an ecn echo that is NOT queued
8219				 * to where the sack is going..
8220				 */
8221				if (chk->whoTo == net) {
8222					/*
8223					 * Don't transmit it to where its
8224					 * going (current net)
8225					 */
8226					continue;
8227				} else if (sack_goes_to == net) {
8228					/*
8229					 * But do transmit it to this
8230					 * address
8231					 */
8232					goto skip_net_check;
8233				}
8234			}
8235			if (chk->whoTo == NULL) {
8236				if (asoc->alternate == NULL) {
8237					if (asoc->primary_destination != net) {
8238						continue;
8239					}
8240				} else {
8241					if (asoc->alternate != net) {
8242						continue;
8243					}
8244				}
8245			} else {
8246				if (chk->whoTo != net) {
8247					continue;
8248				}
8249			}
8250	skip_net_check:
8251			if (chk->data == NULL) {
8252				continue;
8253			}
8254			if (chk->sent != SCTP_DATAGRAM_UNSENT) {
8255				/*
8256				 * It must be unsent. Cookies and ASCONF's
8257				 * hang around but there timers will force
8258				 * when marked for resend.
8259				 */
8260				continue;
8261			}
8262			/*
8263			 * if no AUTH is yet included and this chunk
8264			 * requires it, make sure to account for it.  We
8265			 * don't apply the size until the AUTH chunk is
8266			 * actually added below in case there is no room for
8267			 * this chunk. NOTE: we overload the use of "omtu"
8268			 * here
8269			 */
8270			if ((auth == NULL) &&
8271			    sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8272			    stcb->asoc.peer_auth_chunks)) {
8273				omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8274			} else
8275				omtu = 0;
8276			/* Here we do NOT factor the r_mtu */
8277			if ((chk->send_size <= (int)(mtu - omtu)) ||
8278			    (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8279				/*
8280				 * We probably should glom the mbuf chain
8281				 * from the chk->data for control but the
8282				 * problem is it becomes yet one more level
8283				 * of tracking to do if for some reason
8284				 * output fails. Then I have got to
8285				 * reconstruct the merged control chain.. el
8286				 * yucko.. for now we take the easy way and
8287				 * do the copy
8288				 */
8289				/*
8290				 * Add an AUTH chunk, if chunk requires it
8291				 * save the offset into the chain for AUTH
8292				 */
8293				if ((auth == NULL) &&
8294				    (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8295				    stcb->asoc.peer_auth_chunks))) {
8296					outchain = sctp_add_auth_chunk(outchain,
8297					    &endoutchain,
8298					    &auth,
8299					    &auth_offset,
8300					    stcb,
8301					    chk->rec.chunk_id.id);
8302					SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8303				}
8304				outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8305				    (int)chk->rec.chunk_id.can_take_data,
8306				    chk->send_size, chk->copy_by_ref);
8307				if (outchain == NULL) {
8308					*reason_code = 8;
8309					SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8310					return (ENOMEM);
8311				}
8312				SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8313				/* update our MTU size */
8314				if (mtu > (chk->send_size + omtu))
8315					mtu -= (chk->send_size + omtu);
8316				else
8317					mtu = 0;
8318				to_out += (chk->send_size + omtu);
8319				/* Do clear IP_DF ? */
8320				if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8321					no_fragmentflg = 0;
8322				}
8323				if (chk->rec.chunk_id.can_take_data)
8324					chk->data = NULL;
8325				/* Mark things to be removed, if needed */
8326				if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8327				    (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||	/* EY */
8328				    (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
8329				    (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
8330				    (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
8331				    (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
8332				    (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
8333				    (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
8334				    (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
8335				    (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
8336				    (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
8337					if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
8338						hbflag = 1;
8339					}
8340					/* remove these chunks at the end */
8341					if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8342					    (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
8343						/* turn off the timer */
8344						if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
8345							sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
8346							    inp, stcb, net,
8347							    SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
8348						}
8349					}
8350					ctl_cnt++;
8351				} else {
8352					/*
8353					 * Other chunks, since they have
8354					 * timers running (i.e. COOKIE) we
8355					 * just "trust" that it gets sent or
8356					 * retransmitted.
8357					 */
8358					ctl_cnt++;
8359					if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
8360						cookie = 1;
8361						no_out_cnt = 1;
8362					} else if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
8363						/*
8364						 * Increment ecne send count
8365						 * here this means we may be
8366						 * over-zealous in our
8367						 * counting if the send
8368						 * fails, but its the best
8369						 * place to do it (we used
8370						 * to do it in the queue of
8371						 * the chunk, but that did
8372						 * not tell how many times
8373						 * it was sent.
8374						 */
8375						SCTP_STAT_INCR(sctps_sendecne);
8376					}
8377					chk->sent = SCTP_DATAGRAM_SENT;
8378					if (chk->whoTo == NULL) {
8379						chk->whoTo = net;
8380						atomic_add_int(&net->ref_count, 1);
8381					}
8382					chk->snd_count++;
8383				}
8384				if (mtu == 0) {
8385					/*
8386					 * Ok we are out of room but we can
8387					 * output without effecting the
8388					 * flight size since this little guy
8389					 * is a control only packet.
8390					 */
8391					if (asconf) {
8392						sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8393						/*
8394						 * do NOT clear the asconf
8395						 * flag as it is used to do
8396						 * appropriate source
8397						 * address selection.
8398						 */
8399					}
8400					if (cookie) {
8401						sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8402						cookie = 0;
8403					}
8404					if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8405					    (struct sockaddr *)&net->ro._l_addr,
8406					    outchain,
8407					    auth_offset, auth,
8408					    stcb->asoc.authinfo.active_keyid,
8409					    no_fragmentflg, 0, asconf,
8410					    inp->sctp_lport, stcb->rport,
8411					    htonl(stcb->asoc.peer_vtag),
8412					    net->port, NULL,
8413					    0, 0,
8414					    so_locked))) {
8415						if (error == ENOBUFS) {
8416							asoc->ifp_had_enobuf = 1;
8417							SCTP_STAT_INCR(sctps_lowlevelerr);
8418						}
8419						if (from_where == 0) {
8420							SCTP_STAT_INCR(sctps_lowlevelerrusr);
8421						}
8422						/* error, could not output */
8423						if (hbflag) {
8424							if (*now_filled == 0) {
8425								(void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8426								*now_filled = 1;
8427								*now = net->last_sent_time;
8428							} else {
8429								net->last_sent_time = *now;
8430							}
8431							hbflag = 0;
8432						}
8433						if (error == EHOSTUNREACH) {
8434							/*
8435							 * Destination went
8436							 * unreachable
8437							 * during this send
8438							 */
8439							sctp_move_chunks_from_net(stcb, net);
8440						}
8441						*reason_code = 7;
8442						continue;
8443					} else
8444						asoc->ifp_had_enobuf = 0;
8445					/* Only HB or ASCONF advances time */
8446					if (hbflag) {
8447						if (*now_filled == 0) {
8448							(void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8449							*now_filled = 1;
8450							*now = net->last_sent_time;
8451						} else {
8452							net->last_sent_time = *now;
8453						}
8454						hbflag = 0;
8455					}
8456					/*
8457					 * increase the number we sent, if a
8458					 * cookie is sent we don't tell them
8459					 * any was sent out.
8460					 */
8461					outchain = endoutchain = NULL;
8462					auth = NULL;
8463					auth_offset = 0;
8464					if (!no_out_cnt)
8465						*num_out += ctl_cnt;
8466					/* recalc a clean slate and setup */
8467					switch (net->ro._l_addr.sa.sa_family) {
8468#ifdef INET
8469					case AF_INET:
8470						mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8471						break;
8472#endif
8473#ifdef INET6
8474					case AF_INET6:
8475						mtu = net->mtu - SCTP_MIN_OVERHEAD;
8476						break;
8477#endif
8478					default:
8479						/* TSNH */
8480						mtu = net->mtu;
8481						break;
8482					}
8483					to_out = 0;
8484					no_fragmentflg = 1;
8485				}
8486			}
8487		}
8488		/* JRI: if dest is in PF state, do not send data to it */
8489		if ((asoc->sctp_cmt_on_off > 0) &&
8490		    (net != stcb->asoc.alternate) &&
8491		    (net->dest_state & SCTP_ADDR_PF)) {
8492			goto no_data_fill;
8493		}
8494		if (net->flight_size >= net->cwnd) {
8495			goto no_data_fill;
8496		}
8497		if ((asoc->sctp_cmt_on_off > 0) &&
8498		    (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_RECV_BUFFER_SPLITTING) &&
8499		    (net->flight_size > max_rwnd_per_dest)) {
8500			goto no_data_fill;
8501		}
8502		/*
8503		 * We need a specific accounting for the usage of the send
8504		 * buffer. We also need to check the number of messages per
8505		 * net. For now, this is better than nothing and it disabled
8506		 * by default...
8507		 */
8508		if ((asoc->sctp_cmt_on_off > 0) &&
8509		    (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_SEND_BUFFER_SPLITTING) &&
8510		    (max_send_per_dest > 0) &&
8511		    (net->flight_size > max_send_per_dest)) {
8512			goto no_data_fill;
8513		}
8514		/*********************/
8515		/* Data transmission */
8516		/*********************/
8517		/*
8518		 * if AUTH for DATA is required and no AUTH has been added
8519		 * yet, account for this in the mtu now... if no data can be
8520		 * bundled, this adjustment won't matter anyways since the
8521		 * packet will be going out...
8522		 */
8523		data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
8524		    stcb->asoc.peer_auth_chunks);
8525		if (data_auth_reqd && (auth == NULL)) {
8526			mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8527		}
8528		/* now lets add any data within the MTU constraints */
8529		switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8530#ifdef INET
8531		case AF_INET:
8532			if (net->mtu > (sizeof(struct ip) + sizeof(struct sctphdr)))
8533				omtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
8534			else
8535				omtu = 0;
8536			break;
8537#endif
8538#ifdef INET6
8539		case AF_INET6:
8540			if (net->mtu > (sizeof(struct ip6_hdr) + sizeof(struct sctphdr)))
8541				omtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
8542			else
8543				omtu = 0;
8544			break;
8545#endif
8546		default:
8547			/* TSNH */
8548			omtu = 0;
8549			break;
8550		}
8551		if ((((asoc->state & SCTP_STATE_OPEN) == SCTP_STATE_OPEN) &&
8552		    (skip_data_for_this_net == 0)) ||
8553		    (cookie)) {
8554			TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
8555				if (no_data_chunks) {
8556					/* let only control go out */
8557					*reason_code = 1;
8558					break;
8559				}
8560				if (net->flight_size >= net->cwnd) {
8561					/* skip this net, no room for data */
8562					*reason_code = 2;
8563					break;
8564				}
8565				if ((chk->whoTo != NULL) &&
8566				    (chk->whoTo != net)) {
8567					/* Don't send the chunk on this net */
8568					continue;
8569				}
8570				if (asoc->sctp_cmt_on_off == 0) {
8571					if ((asoc->alternate) &&
8572					    (asoc->alternate != net) &&
8573					    (chk->whoTo == NULL)) {
8574						continue;
8575					} else if ((net != asoc->primary_destination) &&
8576						    (asoc->alternate == NULL) &&
8577					    (chk->whoTo == NULL)) {
8578						continue;
8579					}
8580				}
8581				if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
8582					/*-
8583					 * strange, we have a chunk that is
8584					 * to big for its destination and
8585					 * yet no fragment ok flag.
8586					 * Something went wrong when the
8587					 * PMTU changed...we did not mark
8588					 * this chunk for some reason?? I
8589					 * will fix it here by letting IP
8590					 * fragment it for now and printing
8591					 * a warning. This really should not
8592					 * happen ...
8593					 */
8594					SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
8595					    chk->send_size, mtu);
8596					chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
8597				}
8598				if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
8599				    ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) == SCTP_STATE_SHUTDOWN_PENDING)) {
8600					struct sctp_data_chunk *dchkh;
8601
8602					dchkh = mtod(chk->data, struct sctp_data_chunk *);
8603					dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
8604				}
8605				if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
8606				    ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
8607					/* ok we will add this one */
8608
8609					/*
8610					 * Add an AUTH chunk, if chunk
8611					 * requires it, save the offset into
8612					 * the chain for AUTH
8613					 */
8614					if (data_auth_reqd) {
8615						if (auth == NULL) {
8616							outchain = sctp_add_auth_chunk(outchain,
8617							    &endoutchain,
8618							    &auth,
8619							    &auth_offset,
8620							    stcb,
8621							    SCTP_DATA);
8622							auth_keyid = chk->auth_keyid;
8623							override_ok = 0;
8624							SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8625						} else if (override_ok) {
8626							/*
8627							 * use this data's
8628							 * keyid
8629							 */
8630							auth_keyid = chk->auth_keyid;
8631							override_ok = 0;
8632						} else if (auth_keyid != chk->auth_keyid) {
8633							/*
8634							 * different keyid,
8635							 * so done bundling
8636							 */
8637							break;
8638						}
8639					}
8640					outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
8641					    chk->send_size, chk->copy_by_ref);
8642					if (outchain == NULL) {
8643						SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
8644						if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8645							sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8646						}
8647						*reason_code = 3;
8648						SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8649						return (ENOMEM);
8650					}
8651					/* upate our MTU size */
8652					/* Do clear IP_DF ? */
8653					if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8654						no_fragmentflg = 0;
8655					}
8656					/* unsigned subtraction of mtu */
8657					if (mtu > chk->send_size)
8658						mtu -= chk->send_size;
8659					else
8660						mtu = 0;
8661					/* unsigned subtraction of r_mtu */
8662					if (r_mtu > chk->send_size)
8663						r_mtu -= chk->send_size;
8664					else
8665						r_mtu = 0;
8666
8667					to_out += chk->send_size;
8668					if ((to_out > mx_mtu) && no_fragmentflg) {
8669#ifdef INVARIANTS
8670						panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
8671#else
8672						SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
8673						    mx_mtu, to_out);
8674#endif
8675					}
8676					chk->window_probe = 0;
8677					data_list[bundle_at++] = chk;
8678					if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8679						break;
8680					}
8681					if (chk->sent == SCTP_DATAGRAM_UNSENT) {
8682						if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
8683							SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
8684						} else {
8685							SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
8686						}
8687						if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
8688						    ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
8689							/*
8690							 * Count number of
8691							 * user msg's that
8692							 * were fragmented
8693							 * we do this by
8694							 * counting when we
8695							 * see a LAST
8696							 * fragment only.
8697							 */
8698							SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
8699					}
8700					if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
8701						if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
8702							data_list[0]->window_probe = 1;
8703							net->window_probe = 1;
8704						}
8705						break;
8706					}
8707				} else {
8708					/*
8709					 * Must be sent in order of the
8710					 * TSN's (on a network)
8711					 */
8712					break;
8713				}
8714			}	/* for (chunk gather loop for this net) */
8715		}		/* if asoc.state OPEN */
8716no_data_fill:
8717		/* Is there something to send for this destination? */
8718		if (outchain) {
8719			/* We may need to start a control timer or two */
8720			if (asconf) {
8721				sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
8722				    stcb, net);
8723				/*
8724				 * do NOT clear the asconf flag as it is
8725				 * used to do appropriate source address
8726				 * selection.
8727				 */
8728			}
8729			if (cookie) {
8730				sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8731				cookie = 0;
8732			}
8733			/* must start a send timer if data is being sent */
8734			if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8735				/*
8736				 * no timer running on this destination
8737				 * restart it.
8738				 */
8739				sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8740			}
8741			/* Now send it, if there is anything to send :> */
8742			if ((error = sctp_lowlevel_chunk_output(inp,
8743			    stcb,
8744			    net,
8745			    (struct sockaddr *)&net->ro._l_addr,
8746			    outchain,
8747			    auth_offset,
8748			    auth,
8749			    auth_keyid,
8750			    no_fragmentflg,
8751			    bundle_at,
8752			    asconf,
8753			    inp->sctp_lport, stcb->rport,
8754			    htonl(stcb->asoc.peer_vtag),
8755			    net->port, NULL,
8756			    0, 0,
8757			    so_locked))) {
8758				/* error, we could not output */
8759				if (error == ENOBUFS) {
8760					SCTP_STAT_INCR(sctps_lowlevelerr);
8761					asoc->ifp_had_enobuf = 1;
8762				}
8763				if (from_where == 0) {
8764					SCTP_STAT_INCR(sctps_lowlevelerrusr);
8765				}
8766				SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8767				if (hbflag) {
8768					if (*now_filled == 0) {
8769						(void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8770						*now_filled = 1;
8771						*now = net->last_sent_time;
8772					} else {
8773						net->last_sent_time = *now;
8774					}
8775					hbflag = 0;
8776				}
8777				if (error == EHOSTUNREACH) {
8778					/*
8779					 * Destination went unreachable
8780					 * during this send
8781					 */
8782					sctp_move_chunks_from_net(stcb, net);
8783				}
8784				*reason_code = 6;
8785				/*-
8786				 * I add this line to be paranoid. As far as
8787				 * I can tell the continue, takes us back to
8788				 * the top of the for, but just to make sure
8789				 * I will reset these again here.
8790				 */
8791				ctl_cnt = bundle_at = 0;
8792				continue;	/* This takes us back to the
8793						 * for() for the nets. */
8794			} else {
8795				asoc->ifp_had_enobuf = 0;
8796			}
8797			endoutchain = NULL;
8798			auth = NULL;
8799			auth_offset = 0;
8800			if (bundle_at || hbflag) {
8801				/* For data/asconf and hb set time */
8802				if (*now_filled == 0) {
8803					(void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8804					*now_filled = 1;
8805					*now = net->last_sent_time;
8806				} else {
8807					net->last_sent_time = *now;
8808				}
8809			}
8810			if (!no_out_cnt) {
8811				*num_out += (ctl_cnt + bundle_at);
8812			}
8813			if (bundle_at) {
8814				/* setup for a RTO measurement */
8815				tsns_sent = data_list[0]->rec.data.TSN_seq;
8816				/* fill time if not already filled */
8817				if (*now_filled == 0) {
8818					(void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8819					*now_filled = 1;
8820					*now = asoc->time_last_sent;
8821				} else {
8822					asoc->time_last_sent = *now;
8823				}
8824				if (net->rto_needed) {
8825					data_list[0]->do_rtt = 1;
8826					net->rto_needed = 0;
8827				}
8828				SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
8829				sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
8830			}
8831			if (one_chunk) {
8832				break;
8833			}
8834		}
8835		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8836			sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
8837		}
8838	}
8839	if (old_start_at == NULL) {
8840		old_start_at = start_at;
8841		start_at = TAILQ_FIRST(&asoc->nets);
8842		if (old_start_at)
8843			goto again_one_more_time;
8844	}
8845	/*
8846	 * At the end there should be no NON timed chunks hanging on this
8847	 * queue.
8848	 */
8849	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8850		sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
8851	}
8852	if ((*num_out == 0) && (*reason_code == 0)) {
8853		*reason_code = 4;
8854	} else {
8855		*reason_code = 5;
8856	}
8857	sctp_clean_up_ctl(stcb, asoc, so_locked);
8858	return (0);
8859}
8860
8861void
8862sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
8863{
8864	/*-
8865	 * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
8866	 * the control chunk queue.
8867	 */
8868	struct sctp_chunkhdr *hdr;
8869	struct sctp_tmit_chunk *chk;
8870	struct mbuf *mat;
8871
8872	SCTP_TCB_LOCK_ASSERT(stcb);
8873	sctp_alloc_a_chunk(stcb, chk);
8874	if (chk == NULL) {
8875		/* no memory */
8876		sctp_m_freem(op_err);
8877		return;
8878	}
8879	chk->copy_by_ref = 0;
8880	SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_NOWAIT);
8881	if (op_err == NULL) {
8882		sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
8883		return;
8884	}
8885	chk->send_size = 0;
8886	for (mat = op_err; mat != NULL; mat = SCTP_BUF_NEXT(mat)) {
8887		chk->send_size += SCTP_BUF_LEN(mat);
8888	}
8889	chk->sent = SCTP_DATAGRAM_UNSENT;
8890	chk->snd_count = 0;
8891	chk->asoc = &stcb->asoc;
8892	chk->data = op_err;
8893	chk->whoTo = NULL;
8894	hdr = mtod(op_err, struct sctp_chunkhdr *);
8895	hdr->chunk_type = SCTP_OPERATION_ERROR;
8896	hdr->chunk_flags = 0;
8897	hdr->chunk_length = htons(chk->send_size);
8898	TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue,
8899	    chk,
8900	    sctp_next);
8901	chk->asoc->ctrl_queue_cnt++;
8902}
8903
8904int
8905sctp_send_cookie_echo(struct mbuf *m,
8906    int offset,
8907    struct sctp_tcb *stcb,
8908    struct sctp_nets *net)
8909{
8910	/*-
8911	 * pull out the cookie and put it at the front of the control chunk
8912	 * queue.
8913	 */
8914	int at;
8915	struct mbuf *cookie;
8916	struct sctp_paramhdr parm, *phdr;
8917	struct sctp_chunkhdr *hdr;
8918	struct sctp_tmit_chunk *chk;
8919	uint16_t ptype, plen;
8920
8921	SCTP_TCB_LOCK_ASSERT(stcb);
8922	/* First find the cookie in the param area */
8923	cookie = NULL;
8924	at = offset + sizeof(struct sctp_init_chunk);
8925	for (;;) {
8926		phdr = sctp_get_next_param(m, at, &parm, sizeof(parm));
8927		if (phdr == NULL) {
8928			return (-3);
8929		}
8930		ptype = ntohs(phdr->param_type);
8931		plen = ntohs(phdr->param_length);
8932		if (ptype == SCTP_STATE_COOKIE) {
8933			int pad;
8934
8935			/* found the cookie */
8936			if ((pad = (plen % 4))) {
8937				plen += 4 - pad;
8938			}
8939			cookie = SCTP_M_COPYM(m, at, plen, M_NOWAIT);
8940			if (cookie == NULL) {
8941				/* No memory */
8942				return (-2);
8943			}
8944#ifdef SCTP_MBUF_LOGGING
8945			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8946				sctp_log_mbc(cookie, SCTP_MBUF_ICOPY);
8947			}
8948#endif
8949			break;
8950		}
8951		at += SCTP_SIZE32(plen);
8952	}
8953	/* ok, we got the cookie lets change it into a cookie echo chunk */
8954	/* first the change from param to cookie */
8955	hdr = mtod(cookie, struct sctp_chunkhdr *);
8956	hdr->chunk_type = SCTP_COOKIE_ECHO;
8957	hdr->chunk_flags = 0;
8958	/* get the chunk stuff now and place it in the FRONT of the queue */
8959	sctp_alloc_a_chunk(stcb, chk);
8960	if (chk == NULL) {
8961		/* no memory */
8962		sctp_m_freem(cookie);
8963		return (-5);
8964	}
8965	chk->copy_by_ref = 0;
8966	chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
8967	chk->rec.chunk_id.can_take_data = 0;
8968	chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
8969	chk->send_size = plen;
8970	chk->sent = SCTP_DATAGRAM_UNSENT;
8971	chk->snd_count = 0;
8972	chk->asoc = &stcb->asoc;
8973	chk->data = cookie;
8974	chk->whoTo = net;
8975	atomic_add_int(&chk->whoTo->ref_count, 1);
8976	TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
8977	chk->asoc->ctrl_queue_cnt++;
8978	return (0);
8979}
8980
8981void
8982sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
8983    struct mbuf *m,
8984    int offset,
8985    int chk_length,
8986    struct sctp_nets *net)
8987{
8988	/*
8989	 * take a HB request and make it into a HB ack and send it.
8990	 */
8991	struct mbuf *outchain;
8992	struct sctp_chunkhdr *chdr;
8993	struct sctp_tmit_chunk *chk;
8994
8995
8996	if (net == NULL)
8997		/* must have a net pointer */
8998		return;
8999
9000	outchain = SCTP_M_COPYM(m, offset, chk_length, M_NOWAIT);
9001	if (outchain == NULL) {
9002		/* gak out of memory */
9003		return;
9004	}
9005#ifdef SCTP_MBUF_LOGGING
9006	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9007		sctp_log_mbc(outchain, SCTP_MBUF_ICOPY);
9008	}
9009#endif
9010	chdr = mtod(outchain, struct sctp_chunkhdr *);
9011	chdr->chunk_type = SCTP_HEARTBEAT_ACK;
9012	chdr->chunk_flags = 0;
9013	if (chk_length % 4) {
9014		/* need pad */
9015		uint32_t cpthis = 0;
9016		int padlen;
9017
9018		padlen = 4 - (chk_length % 4);
9019		m_copyback(outchain, chk_length, padlen, (caddr_t)&cpthis);
9020	}
9021	sctp_alloc_a_chunk(stcb, chk);
9022	if (chk == NULL) {
9023		/* no memory */
9024		sctp_m_freem(outchain);
9025		return;
9026	}
9027	chk->copy_by_ref = 0;
9028	chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
9029	chk->rec.chunk_id.can_take_data = 1;
9030	chk->flags = 0;
9031	chk->send_size = chk_length;
9032	chk->sent = SCTP_DATAGRAM_UNSENT;
9033	chk->snd_count = 0;
9034	chk->asoc = &stcb->asoc;
9035	chk->data = outchain;
9036	chk->whoTo = net;
9037	atomic_add_int(&chk->whoTo->ref_count, 1);
9038	TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9039	chk->asoc->ctrl_queue_cnt++;
9040}
9041
9042void
9043sctp_send_cookie_ack(struct sctp_tcb *stcb)
9044{
9045	/* formulate and queue a cookie-ack back to sender */
9046	struct mbuf *cookie_ack;
9047	struct sctp_chunkhdr *hdr;
9048	struct sctp_tmit_chunk *chk;
9049
9050	SCTP_TCB_LOCK_ASSERT(stcb);
9051
9052	cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
9053	if (cookie_ack == NULL) {
9054		/* no mbuf's */
9055		return;
9056	}
9057	SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
9058	sctp_alloc_a_chunk(stcb, chk);
9059	if (chk == NULL) {
9060		/* no memory */
9061		sctp_m_freem(cookie_ack);
9062		return;
9063	}
9064	chk->copy_by_ref = 0;
9065	chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
9066	chk->rec.chunk_id.can_take_data = 1;
9067	chk->flags = 0;
9068	chk->send_size = sizeof(struct sctp_chunkhdr);
9069	chk->sent = SCTP_DATAGRAM_UNSENT;
9070	chk->snd_count = 0;
9071	chk->asoc = &stcb->asoc;
9072	chk->data = cookie_ack;
9073	if (chk->asoc->last_control_chunk_from != NULL) {
9074		chk->whoTo = chk->asoc->last_control_chunk_from;
9075		atomic_add_int(&chk->whoTo->ref_count, 1);
9076	} else {
9077		chk->whoTo = NULL;
9078	}
9079	hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
9080	hdr->chunk_type = SCTP_COOKIE_ACK;
9081	hdr->chunk_flags = 0;
9082	hdr->chunk_length = htons(chk->send_size);
9083	SCTP_BUF_LEN(cookie_ack) = chk->send_size;
9084	TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9085	chk->asoc->ctrl_queue_cnt++;
9086	return;
9087}
9088
9089
9090void
9091sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
9092{
9093	/* formulate and queue a SHUTDOWN-ACK back to the sender */
9094	struct mbuf *m_shutdown_ack;
9095	struct sctp_shutdown_ack_chunk *ack_cp;
9096	struct sctp_tmit_chunk *chk;
9097
9098	m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9099	if (m_shutdown_ack == NULL) {
9100		/* no mbuf's */
9101		return;
9102	}
9103	SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
9104	sctp_alloc_a_chunk(stcb, chk);
9105	if (chk == NULL) {
9106		/* no memory */
9107		sctp_m_freem(m_shutdown_ack);
9108		return;
9109	}
9110	chk->copy_by_ref = 0;
9111	chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
9112	chk->rec.chunk_id.can_take_data = 1;
9113	chk->flags = 0;
9114	chk->send_size = sizeof(struct sctp_chunkhdr);
9115	chk->sent = SCTP_DATAGRAM_UNSENT;
9116	chk->snd_count = 0;
9117	chk->flags = 0;
9118	chk->asoc = &stcb->asoc;
9119	chk->data = m_shutdown_ack;
9120	chk->whoTo = net;
9121	if (chk->whoTo) {
9122		atomic_add_int(&chk->whoTo->ref_count, 1);
9123	}
9124	ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
9125	ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
9126	ack_cp->ch.chunk_flags = 0;
9127	ack_cp->ch.chunk_length = htons(chk->send_size);
9128	SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
9129	TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9130	chk->asoc->ctrl_queue_cnt++;
9131	return;
9132}
9133
9134void
9135sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
9136{
9137	/* formulate and queue a SHUTDOWN to the sender */
9138	struct mbuf *m_shutdown;
9139	struct sctp_shutdown_chunk *shutdown_cp;
9140	struct sctp_tmit_chunk *chk;
9141
9142	m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9143	if (m_shutdown == NULL) {
9144		/* no mbuf's */
9145		return;
9146	}
9147	SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
9148	sctp_alloc_a_chunk(stcb, chk);
9149	if (chk == NULL) {
9150		/* no memory */
9151		sctp_m_freem(m_shutdown);
9152		return;
9153	}
9154	chk->copy_by_ref = 0;
9155	chk->rec.chunk_id.id = SCTP_SHUTDOWN;
9156	chk->rec.chunk_id.can_take_data = 1;
9157	chk->flags = 0;
9158	chk->send_size = sizeof(struct sctp_shutdown_chunk);
9159	chk->sent = SCTP_DATAGRAM_UNSENT;
9160	chk->snd_count = 0;
9161	chk->flags = 0;
9162	chk->asoc = &stcb->asoc;
9163	chk->data = m_shutdown;
9164	chk->whoTo = net;
9165	if (chk->whoTo) {
9166		atomic_add_int(&chk->whoTo->ref_count, 1);
9167	}
9168	shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
9169	shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
9170	shutdown_cp->ch.chunk_flags = 0;
9171	shutdown_cp->ch.chunk_length = htons(chk->send_size);
9172	shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9173	SCTP_BUF_LEN(m_shutdown) = chk->send_size;
9174	TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9175	chk->asoc->ctrl_queue_cnt++;
9176	return;
9177}
9178
9179void
9180sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
9181{
9182	/*
9183	 * formulate and queue an ASCONF to the peer. ASCONF parameters
9184	 * should be queued on the assoc queue.
9185	 */
9186	struct sctp_tmit_chunk *chk;
9187	struct mbuf *m_asconf;
9188	int len;
9189
9190	SCTP_TCB_LOCK_ASSERT(stcb);
9191
9192	if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
9193	    (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
9194		/* can't send a new one if there is one in flight already */
9195		return;
9196	}
9197	/* compose an ASCONF chunk, maximum length is PMTU */
9198	m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
9199	if (m_asconf == NULL) {
9200		return;
9201	}
9202	sctp_alloc_a_chunk(stcb, chk);
9203	if (chk == NULL) {
9204		/* no memory */
9205		sctp_m_freem(m_asconf);
9206		return;
9207	}
9208	chk->copy_by_ref = 0;
9209	chk->rec.chunk_id.id = SCTP_ASCONF;
9210	chk->rec.chunk_id.can_take_data = 0;
9211	chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9212	chk->data = m_asconf;
9213	chk->send_size = len;
9214	chk->sent = SCTP_DATAGRAM_UNSENT;
9215	chk->snd_count = 0;
9216	chk->asoc = &stcb->asoc;
9217	chk->whoTo = net;
9218	if (chk->whoTo) {
9219		atomic_add_int(&chk->whoTo->ref_count, 1);
9220	}
9221	TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
9222	chk->asoc->ctrl_queue_cnt++;
9223	return;
9224}
9225
9226void
9227sctp_send_asconf_ack(struct sctp_tcb *stcb)
9228{
9229	/*
9230	 * formulate and queue a asconf-ack back to sender. the asconf-ack
9231	 * must be stored in the tcb.
9232	 */
9233	struct sctp_tmit_chunk *chk;
9234	struct sctp_asconf_ack *ack, *latest_ack;
9235	struct mbuf *m_ack;
9236	struct sctp_nets *net = NULL;
9237
9238	SCTP_TCB_LOCK_ASSERT(stcb);
9239	/* Get the latest ASCONF-ACK */
9240	latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
9241	if (latest_ack == NULL) {
9242		return;
9243	}
9244	if (latest_ack->last_sent_to != NULL &&
9245	    latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
9246		/* we're doing a retransmission */
9247		net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
9248		if (net == NULL) {
9249			/* no alternate */
9250			if (stcb->asoc.last_control_chunk_from == NULL) {
9251				if (stcb->asoc.alternate) {
9252					net = stcb->asoc.alternate;
9253				} else {
9254					net = stcb->asoc.primary_destination;
9255				}
9256			} else {
9257				net = stcb->asoc.last_control_chunk_from;
9258			}
9259		}
9260	} else {
9261		/* normal case */
9262		if (stcb->asoc.last_control_chunk_from == NULL) {
9263			if (stcb->asoc.alternate) {
9264				net = stcb->asoc.alternate;
9265			} else {
9266				net = stcb->asoc.primary_destination;
9267			}
9268		} else {
9269			net = stcb->asoc.last_control_chunk_from;
9270		}
9271	}
9272	latest_ack->last_sent_to = net;
9273
9274	TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
9275		if (ack->data == NULL) {
9276			continue;
9277		}
9278		/* copy the asconf_ack */
9279		m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_NOWAIT);
9280		if (m_ack == NULL) {
9281			/* couldn't copy it */
9282			return;
9283		}
9284#ifdef SCTP_MBUF_LOGGING
9285		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9286			sctp_log_mbc(m_ack, SCTP_MBUF_ICOPY);
9287		}
9288#endif
9289
9290		sctp_alloc_a_chunk(stcb, chk);
9291		if (chk == NULL) {
9292			/* no memory */
9293			if (m_ack)
9294				sctp_m_freem(m_ack);
9295			return;
9296		}
9297		chk->copy_by_ref = 0;
9298		chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
9299		chk->rec.chunk_id.can_take_data = 1;
9300		chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9301		chk->whoTo = net;
9302		if (chk->whoTo) {
9303			atomic_add_int(&chk->whoTo->ref_count, 1);
9304		}
9305		chk->data = m_ack;
9306		chk->send_size = ack->len;
9307		chk->sent = SCTP_DATAGRAM_UNSENT;
9308		chk->snd_count = 0;
9309		chk->asoc = &stcb->asoc;
9310
9311		TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9312		chk->asoc->ctrl_queue_cnt++;
9313	}
9314	return;
9315}
9316
9317
9318static int
9319sctp_chunk_retransmission(struct sctp_inpcb *inp,
9320    struct sctp_tcb *stcb,
9321    struct sctp_association *asoc,
9322    int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked
9323#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9324    SCTP_UNUSED
9325#endif
9326)
9327{
9328	/*-
9329	 * send out one MTU of retransmission. If fast_retransmit is
9330	 * happening we ignore the cwnd. Otherwise we obey the cwnd and
9331	 * rwnd. For a Cookie or Asconf in the control chunk queue we
9332	 * retransmit them by themselves.
9333	 *
9334	 * For data chunks we will pick out the lowest TSN's in the sent_queue
9335	 * marked for resend and bundle them all together (up to a MTU of
9336	 * destination). The address to send to should have been
9337	 * selected/changed where the retransmission was marked (i.e. in FR
9338	 * or t3-timeout routines).
9339	 */
9340	struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
9341	struct sctp_tmit_chunk *chk, *fwd;
9342	struct mbuf *m, *endofchain;
9343	struct sctp_nets *net = NULL;
9344	uint32_t tsns_sent = 0;
9345	int no_fragmentflg, bundle_at, cnt_thru;
9346	unsigned int mtu;
9347	int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
9348	struct sctp_auth_chunk *auth = NULL;
9349	uint32_t auth_offset = 0;
9350	uint16_t auth_keyid;
9351	int override_ok = 1;
9352	int data_auth_reqd = 0;
9353	uint32_t dmtu = 0;
9354
9355	SCTP_TCB_LOCK_ASSERT(stcb);
9356	tmr_started = ctl_cnt = bundle_at = error = 0;
9357	no_fragmentflg = 1;
9358	fwd_tsn = 0;
9359	*cnt_out = 0;
9360	fwd = NULL;
9361	endofchain = m = NULL;
9362	auth_keyid = stcb->asoc.authinfo.active_keyid;
9363#ifdef SCTP_AUDITING_ENABLED
9364	sctp_audit_log(0xC3, 1);
9365#endif
9366	if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
9367	    (TAILQ_EMPTY(&asoc->control_send_queue))) {
9368		SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
9369		    asoc->sent_queue_retran_cnt);
9370		asoc->sent_queue_cnt = 0;
9371		asoc->sent_queue_cnt_removeable = 0;
9372		/* send back 0/0 so we enter normal transmission */
9373		*cnt_out = 0;
9374		return (0);
9375	}
9376	TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9377		if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
9378		    (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
9379		    (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
9380			if (chk->sent != SCTP_DATAGRAM_RESEND) {
9381				continue;
9382			}
9383			if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
9384				if (chk != asoc->str_reset) {
9385					/*
9386					 * not eligible for retran if its
9387					 * not ours
9388					 */
9389					continue;
9390				}
9391			}
9392			ctl_cnt++;
9393			if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9394				fwd_tsn = 1;
9395			}
9396			/*
9397			 * Add an AUTH chunk, if chunk requires it save the
9398			 * offset into the chain for AUTH
9399			 */
9400			if ((auth == NULL) &&
9401			    (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
9402			    stcb->asoc.peer_auth_chunks))) {
9403				m = sctp_add_auth_chunk(m, &endofchain,
9404				    &auth, &auth_offset,
9405				    stcb,
9406				    chk->rec.chunk_id.id);
9407				SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9408			}
9409			m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9410			break;
9411		}
9412	}
9413	one_chunk = 0;
9414	cnt_thru = 0;
9415	/* do we have control chunks to retransmit? */
9416	if (m != NULL) {
9417		/* Start a timer no matter if we suceed or fail */
9418		if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
9419			sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
9420		} else if (chk->rec.chunk_id.id == SCTP_ASCONF)
9421			sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
9422		chk->snd_count++;	/* update our count */
9423		if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
9424		    (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
9425		    auth_offset, auth, stcb->asoc.authinfo.active_keyid,
9426		    no_fragmentflg, 0, 0,
9427		    inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9428		    chk->whoTo->port, NULL,
9429		    0, 0,
9430		    so_locked))) {
9431			SCTP_STAT_INCR(sctps_lowlevelerr);
9432			return (error);
9433		}
9434		endofchain = NULL;
9435		auth = NULL;
9436		auth_offset = 0;
9437		/*
9438		 * We don't want to mark the net->sent time here since this
9439		 * we use this for HB and retrans cannot measure RTT
9440		 */
9441		/* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
9442		*cnt_out += 1;
9443		chk->sent = SCTP_DATAGRAM_SENT;
9444		sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
9445		if (fwd_tsn == 0) {
9446			return (0);
9447		} else {
9448			/* Clean up the fwd-tsn list */
9449			sctp_clean_up_ctl(stcb, asoc, so_locked);
9450			return (0);
9451		}
9452	}
9453	/*
9454	 * Ok, it is just data retransmission we need to do or that and a
9455	 * fwd-tsn with it all.
9456	 */
9457	if (TAILQ_EMPTY(&asoc->sent_queue)) {
9458		return (SCTP_RETRAN_DONE);
9459	}
9460	if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) ||
9461	    (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT)) {
9462		/* not yet open, resend the cookie and that is it */
9463		return (1);
9464	}
9465#ifdef SCTP_AUDITING_ENABLED
9466	sctp_auditing(20, inp, stcb, NULL);
9467#endif
9468	data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
9469	TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
9470		if (chk->sent != SCTP_DATAGRAM_RESEND) {
9471			/* No, not sent to this net or not ready for rtx */
9472			continue;
9473		}
9474		if (chk->data == NULL) {
9475			SCTP_PRINTF("TSN:%x chk->snd_count:%d chk->sent:%d can't retran - no data\n",
9476			    chk->rec.data.TSN_seq, chk->snd_count, chk->sent);
9477			continue;
9478		}
9479		if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
9480		    (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
9481			/* Gak, we have exceeded max unlucky retran, abort! */
9482			SCTP_PRINTF("Gak, chk->snd_count:%d >= max:%d - send abort\n",
9483			    chk->snd_count,
9484			    SCTP_BASE_SYSCTL(sctp_max_retran_chunk));
9485			atomic_add_int(&stcb->asoc.refcnt, 1);
9486			sctp_abort_an_association(stcb->sctp_ep, stcb, NULL, so_locked);
9487			SCTP_TCB_LOCK(stcb);
9488			atomic_subtract_int(&stcb->asoc.refcnt, 1);
9489			return (SCTP_RETRAN_EXIT);
9490		}
9491		/* pick up the net */
9492		net = chk->whoTo;
9493		switch (net->ro._l_addr.sa.sa_family) {
9494#ifdef INET
9495		case AF_INET:
9496			mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
9497			break;
9498#endif
9499#ifdef INET6
9500		case AF_INET6:
9501			mtu = net->mtu - SCTP_MIN_OVERHEAD;
9502			break;
9503#endif
9504		default:
9505			/* TSNH */
9506			mtu = net->mtu;
9507			break;
9508		}
9509
9510		if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
9511			/* No room in peers rwnd */
9512			uint32_t tsn;
9513
9514			tsn = asoc->last_acked_seq + 1;
9515			if (tsn == chk->rec.data.TSN_seq) {
9516				/*
9517				 * we make a special exception for this
9518				 * case. The peer has no rwnd but is missing
9519				 * the lowest chunk.. which is probably what
9520				 * is holding up the rwnd.
9521				 */
9522				goto one_chunk_around;
9523			}
9524			return (1);
9525		}
9526one_chunk_around:
9527		if (asoc->peers_rwnd < mtu) {
9528			one_chunk = 1;
9529			if ((asoc->peers_rwnd == 0) &&
9530			    (asoc->total_flight == 0)) {
9531				chk->window_probe = 1;
9532				chk->whoTo->window_probe = 1;
9533			}
9534		}
9535#ifdef SCTP_AUDITING_ENABLED
9536		sctp_audit_log(0xC3, 2);
9537#endif
9538		bundle_at = 0;
9539		m = NULL;
9540		net->fast_retran_ip = 0;
9541		if (chk->rec.data.doing_fast_retransmit == 0) {
9542			/*
9543			 * if no FR in progress skip destination that have
9544			 * flight_size > cwnd.
9545			 */
9546			if (net->flight_size >= net->cwnd) {
9547				continue;
9548			}
9549		} else {
9550			/*
9551			 * Mark the destination net to have FR recovery
9552			 * limits put on it.
9553			 */
9554			*fr_done = 1;
9555			net->fast_retran_ip = 1;
9556		}
9557
9558		/*
9559		 * if no AUTH is yet included and this chunk requires it,
9560		 * make sure to account for it.  We don't apply the size
9561		 * until the AUTH chunk is actually added below in case
9562		 * there is no room for this chunk.
9563		 */
9564		if (data_auth_reqd && (auth == NULL)) {
9565			dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9566		} else
9567			dmtu = 0;
9568
9569		if ((chk->send_size <= (mtu - dmtu)) ||
9570		    (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
9571			/* ok we will add this one */
9572			if (data_auth_reqd) {
9573				if (auth == NULL) {
9574					m = sctp_add_auth_chunk(m,
9575					    &endofchain,
9576					    &auth,
9577					    &auth_offset,
9578					    stcb,
9579					    SCTP_DATA);
9580					auth_keyid = chk->auth_keyid;
9581					override_ok = 0;
9582					SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9583				} else if (override_ok) {
9584					auth_keyid = chk->auth_keyid;
9585					override_ok = 0;
9586				} else if (chk->auth_keyid != auth_keyid) {
9587					/* different keyid, so done bundling */
9588					break;
9589				}
9590			}
9591			m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9592			if (m == NULL) {
9593				SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9594				return (ENOMEM);
9595			}
9596			/* Do clear IP_DF ? */
9597			if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9598				no_fragmentflg = 0;
9599			}
9600			/* upate our MTU size */
9601			if (mtu > (chk->send_size + dmtu))
9602				mtu -= (chk->send_size + dmtu);
9603			else
9604				mtu = 0;
9605			data_list[bundle_at++] = chk;
9606			if (one_chunk && (asoc->total_flight <= 0)) {
9607				SCTP_STAT_INCR(sctps_windowprobed);
9608			}
9609		}
9610		if (one_chunk == 0) {
9611			/*
9612			 * now are there anymore forward from chk to pick
9613			 * up?
9614			 */
9615			for (fwd = TAILQ_NEXT(chk, sctp_next); fwd != NULL; fwd = TAILQ_NEXT(fwd, sctp_next)) {
9616				if (fwd->sent != SCTP_DATAGRAM_RESEND) {
9617					/* Nope, not for retran */
9618					continue;
9619				}
9620				if (fwd->whoTo != net) {
9621					/* Nope, not the net in question */
9622					continue;
9623				}
9624				if (data_auth_reqd && (auth == NULL)) {
9625					dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9626				} else
9627					dmtu = 0;
9628				if (fwd->send_size <= (mtu - dmtu)) {
9629					if (data_auth_reqd) {
9630						if (auth == NULL) {
9631							m = sctp_add_auth_chunk(m,
9632							    &endofchain,
9633							    &auth,
9634							    &auth_offset,
9635							    stcb,
9636							    SCTP_DATA);
9637							auth_keyid = fwd->auth_keyid;
9638							override_ok = 0;
9639							SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9640						} else if (override_ok) {
9641							auth_keyid = fwd->auth_keyid;
9642							override_ok = 0;
9643						} else if (fwd->auth_keyid != auth_keyid) {
9644							/*
9645							 * different keyid,
9646							 * so done bundling
9647							 */
9648							break;
9649						}
9650					}
9651					m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
9652					if (m == NULL) {
9653						SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9654						return (ENOMEM);
9655					}
9656					/* Do clear IP_DF ? */
9657					if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9658						no_fragmentflg = 0;
9659					}
9660					/* upate our MTU size */
9661					if (mtu > (fwd->send_size + dmtu))
9662						mtu -= (fwd->send_size + dmtu);
9663					else
9664						mtu = 0;
9665					data_list[bundle_at++] = fwd;
9666					if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
9667						break;
9668					}
9669				} else {
9670					/* can't fit so we are done */
9671					break;
9672				}
9673			}
9674		}
9675		/* Is there something to send for this destination? */
9676		if (m) {
9677			/*
9678			 * No matter if we fail/or suceed we should start a
9679			 * timer. A failure is like a lost IP packet :-)
9680			 */
9681			if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9682				/*
9683				 * no timer running on this destination
9684				 * restart it.
9685				 */
9686				sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9687				tmr_started = 1;
9688			}
9689			/* Now lets send it, if there is anything to send :> */
9690			if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
9691			    (struct sockaddr *)&net->ro._l_addr, m,
9692			    auth_offset, auth, auth_keyid,
9693			    no_fragmentflg, 0, 0,
9694			    inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9695			    net->port, NULL,
9696			    0, 0,
9697			    so_locked))) {
9698				/* error, we could not output */
9699				SCTP_STAT_INCR(sctps_lowlevelerr);
9700				return (error);
9701			}
9702			endofchain = NULL;
9703			auth = NULL;
9704			auth_offset = 0;
9705			/* For HB's */
9706			/*
9707			 * We don't want to mark the net->sent time here
9708			 * since this we use this for HB and retrans cannot
9709			 * measure RTT
9710			 */
9711			/* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
9712
9713			/* For auto-close */
9714			cnt_thru++;
9715			if (*now_filled == 0) {
9716				(void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
9717				*now = asoc->time_last_sent;
9718				*now_filled = 1;
9719			} else {
9720				asoc->time_last_sent = *now;
9721			}
9722			*cnt_out += bundle_at;
9723#ifdef SCTP_AUDITING_ENABLED
9724			sctp_audit_log(0xC4, bundle_at);
9725#endif
9726			if (bundle_at) {
9727				tsns_sent = data_list[0]->rec.data.TSN_seq;
9728			}
9729			for (i = 0; i < bundle_at; i++) {
9730				SCTP_STAT_INCR(sctps_sendretransdata);
9731				data_list[i]->sent = SCTP_DATAGRAM_SENT;
9732				/*
9733				 * When we have a revoked data, and we
9734				 * retransmit it, then we clear the revoked
9735				 * flag since this flag dictates if we
9736				 * subtracted from the fs
9737				 */
9738				if (data_list[i]->rec.data.chunk_was_revoked) {
9739					/* Deflate the cwnd */
9740					data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
9741					data_list[i]->rec.data.chunk_was_revoked = 0;
9742				}
9743				data_list[i]->snd_count++;
9744				sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9745				/* record the time */
9746				data_list[i]->sent_rcv_time = asoc->time_last_sent;
9747				if (data_list[i]->book_size_scale) {
9748					/*
9749					 * need to double the book size on
9750					 * this one
9751					 */
9752					data_list[i]->book_size_scale = 0;
9753					/*
9754					 * Since we double the booksize, we
9755					 * must also double the output queue
9756					 * size, since this get shrunk when
9757					 * we free by this amount.
9758					 */
9759					atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
9760					data_list[i]->book_size *= 2;
9761
9762
9763				} else {
9764					if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
9765						sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
9766						    asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
9767					}
9768					asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
9769					    (uint32_t) (data_list[i]->send_size +
9770					    SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
9771				}
9772				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
9773					sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
9774					    data_list[i]->whoTo->flight_size,
9775					    data_list[i]->book_size,
9776					    (uintptr_t) data_list[i]->whoTo,
9777					    data_list[i]->rec.data.TSN_seq);
9778				}
9779				sctp_flight_size_increase(data_list[i]);
9780				sctp_total_flight_increase(stcb, data_list[i]);
9781				if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
9782					/* SWS sender side engages */
9783					asoc->peers_rwnd = 0;
9784				}
9785				if ((i == 0) &&
9786				    (data_list[i]->rec.data.doing_fast_retransmit)) {
9787					SCTP_STAT_INCR(sctps_sendfastretrans);
9788					if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
9789					    (tmr_started == 0)) {
9790						/*-
9791						 * ok we just fast-retrans'd
9792						 * the lowest TSN, i.e the
9793						 * first on the list. In
9794						 * this case we want to give
9795						 * some more time to get a
9796						 * SACK back without a
9797						 * t3-expiring.
9798						 */
9799						sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
9800						    SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_2);
9801						sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9802					}
9803				}
9804			}
9805			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9806				sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
9807			}
9808#ifdef SCTP_AUDITING_ENABLED
9809			sctp_auditing(21, inp, stcb, NULL);
9810#endif
9811		} else {
9812			/* None will fit */
9813			return (1);
9814		}
9815		if (asoc->sent_queue_retran_cnt <= 0) {
9816			/* all done we have no more to retran */
9817			asoc->sent_queue_retran_cnt = 0;
9818			break;
9819		}
9820		if (one_chunk) {
9821			/* No more room in rwnd */
9822			return (1);
9823		}
9824		/* stop the for loop here. we sent out a packet */
9825		break;
9826	}
9827	return (0);
9828}
9829
9830static void
9831sctp_timer_validation(struct sctp_inpcb *inp,
9832    struct sctp_tcb *stcb,
9833    struct sctp_association *asoc)
9834{
9835	struct sctp_nets *net;
9836
9837	/* Validate that a timer is running somewhere */
9838	TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9839		if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9840			/* Here is a timer */
9841			return;
9842		}
9843	}
9844	SCTP_TCB_LOCK_ASSERT(stcb);
9845	/* Gak, we did not have a timer somewhere */
9846	SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
9847	if (asoc->alternate) {
9848		sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->alternate);
9849	} else {
9850		sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
9851	}
9852	return;
9853}
9854
9855void
9856sctp_chunk_output(struct sctp_inpcb *inp,
9857    struct sctp_tcb *stcb,
9858    int from_where,
9859    int so_locked
9860#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9861    SCTP_UNUSED
9862#endif
9863)
9864{
9865	/*-
9866	 * Ok this is the generic chunk service queue. we must do the
9867	 * following:
9868	 * - See if there are retransmits pending, if so we must
9869	 *   do these first.
9870	 * - Service the stream queue that is next, moving any
9871	 *   message (note I must get a complete message i.e.
9872	 *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
9873	 *   TSN's
9874	 * - Check to see if the cwnd/rwnd allows any output, if so we
9875	 *   go ahead and fomulate and send the low level chunks. Making sure
9876	 *   to combine any control in the control chunk queue also.
9877	 */
9878	struct sctp_association *asoc;
9879	struct sctp_nets *net;
9880	int error = 0, num_out, tot_out = 0, ret = 0, reason_code;
9881	unsigned int burst_cnt = 0;
9882	struct timeval now;
9883	int now_filled = 0;
9884	int nagle_on;
9885	int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
9886	int un_sent = 0;
9887	int fr_done;
9888	unsigned int tot_frs = 0;
9889
9890	asoc = &stcb->asoc;
9891	/* The Nagle algorithm is only applied when handling a send call. */
9892	if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
9893		if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
9894			nagle_on = 0;
9895		} else {
9896			nagle_on = 1;
9897		}
9898	} else {
9899		nagle_on = 0;
9900	}
9901	SCTP_TCB_LOCK_ASSERT(stcb);
9902
9903	un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
9904
9905	if ((un_sent <= 0) &&
9906	    (TAILQ_EMPTY(&asoc->control_send_queue)) &&
9907	    (TAILQ_EMPTY(&asoc->asconf_send_queue)) &&
9908	    (asoc->sent_queue_retran_cnt == 0)) {
9909		/* Nothing to do unless there is something to be sent left */
9910		return;
9911	}
9912	/*
9913	 * Do we have something to send, data or control AND a sack timer
9914	 * running, if so piggy-back the sack.
9915	 */
9916	if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
9917		sctp_send_sack(stcb, so_locked);
9918		(void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
9919	}
9920	while (asoc->sent_queue_retran_cnt) {
9921		/*-
9922		 * Ok, it is retransmission time only, we send out only ONE
9923		 * packet with a single call off to the retran code.
9924		 */
9925		if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
9926			/*-
9927			 * Special hook for handling cookiess discarded
9928			 * by peer that carried data. Send cookie-ack only
9929			 * and then the next call with get the retran's.
9930			 */
9931			(void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9932			    from_where,
9933			    &now, &now_filled, frag_point, so_locked);
9934			return;
9935		} else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
9936			/* if its not from a HB then do it */
9937			fr_done = 0;
9938			ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
9939			if (fr_done) {
9940				tot_frs++;
9941			}
9942		} else {
9943			/*
9944			 * its from any other place, we don't allow retran
9945			 * output (only control)
9946			 */
9947			ret = 1;
9948		}
9949		if (ret > 0) {
9950			/* Can't send anymore */
9951			/*-
9952			 * now lets push out control by calling med-level
9953			 * output once. this assures that we WILL send HB's
9954			 * if queued too.
9955			 */
9956			(void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9957			    from_where,
9958			    &now, &now_filled, frag_point, so_locked);
9959#ifdef SCTP_AUDITING_ENABLED
9960			sctp_auditing(8, inp, stcb, NULL);
9961#endif
9962			sctp_timer_validation(inp, stcb, asoc);
9963			return;
9964		}
9965		if (ret < 0) {
9966			/*-
9967			 * The count was off.. retran is not happening so do
9968			 * the normal retransmission.
9969			 */
9970#ifdef SCTP_AUDITING_ENABLED
9971			sctp_auditing(9, inp, stcb, NULL);
9972#endif
9973			if (ret == SCTP_RETRAN_EXIT) {
9974				return;
9975			}
9976			break;
9977		}
9978		if (from_where == SCTP_OUTPUT_FROM_T3) {
9979			/* Only one transmission allowed out of a timeout */
9980#ifdef SCTP_AUDITING_ENABLED
9981			sctp_auditing(10, inp, stcb, NULL);
9982#endif
9983			/* Push out any control */
9984			(void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
9985			    &now, &now_filled, frag_point, so_locked);
9986			return;
9987		}
9988		if ((asoc->fr_max_burst > 0) && (tot_frs >= asoc->fr_max_burst)) {
9989			/* Hit FR burst limit */
9990			return;
9991		}
9992		if ((num_out == 0) && (ret == 0)) {
9993			/* No more retrans to send */
9994			break;
9995		}
9996	}
9997#ifdef SCTP_AUDITING_ENABLED
9998	sctp_auditing(12, inp, stcb, NULL);
9999#endif
10000	/* Check for bad destinations, if they exist move chunks around. */
10001	TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
10002		if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
10003			/*-
10004			 * if possible move things off of this address we
10005			 * still may send below due to the dormant state but
10006			 * we try to find an alternate address to send to
10007			 * and if we have one we move all queued data on the
10008			 * out wheel to this alternate address.
10009			 */
10010			if (net->ref_count > 1)
10011				sctp_move_chunks_from_net(stcb, net);
10012		} else {
10013			/*-
10014			 * if ((asoc->sat_network) || (net->addr_is_local))
10015			 * { burst_limit = asoc->max_burst *
10016			 * SCTP_SAT_NETWORK_BURST_INCR; }
10017			 */
10018			if (asoc->max_burst > 0) {
10019				if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
10020					if ((net->flight_size + (asoc->max_burst * net->mtu)) < net->cwnd) {
10021						/*
10022						 * JRS - Use the congestion
10023						 * control given in the
10024						 * congestion control module
10025						 */
10026						asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, asoc->max_burst);
10027						if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10028							sctp_log_maxburst(stcb, net, 0, asoc->max_burst, SCTP_MAX_BURST_APPLIED);
10029						}
10030						SCTP_STAT_INCR(sctps_maxburstqueued);
10031					}
10032					net->fast_retran_ip = 0;
10033				} else {
10034					if (net->flight_size == 0) {
10035						/*
10036						 * Should be decaying the
10037						 * cwnd here
10038						 */
10039						;
10040					}
10041				}
10042			}
10043		}
10044
10045	}
10046	burst_cnt = 0;
10047	do {
10048		error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
10049		    &reason_code, 0, from_where,
10050		    &now, &now_filled, frag_point, so_locked);
10051		if (error) {
10052			SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
10053			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10054				sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
10055			}
10056			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10057				sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
10058				sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
10059			}
10060			break;
10061		}
10062		SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
10063
10064		tot_out += num_out;
10065		burst_cnt++;
10066		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10067			sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
10068			if (num_out == 0) {
10069				sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
10070			}
10071		}
10072		if (nagle_on) {
10073			/*
10074			 * When the Nagle algorithm is used, look at how
10075			 * much is unsent, then if its smaller than an MTU
10076			 * and we have data in flight we stop, except if we
10077			 * are handling a fragmented user message.
10078			 */
10079			un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
10080			    (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
10081			if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
10082			    (stcb->asoc.total_flight > 0) &&
10083			    ((stcb->asoc.locked_on_sending == NULL) ||
10084			    sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
10085				break;
10086			}
10087		}
10088		if (TAILQ_EMPTY(&asoc->control_send_queue) &&
10089		    TAILQ_EMPTY(&asoc->send_queue) &&
10090		    stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
10091			/* Nothing left to send */
10092			break;
10093		}
10094		if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
10095			/* Nothing left to send */
10096			break;
10097		}
10098	} while (num_out &&
10099	    ((asoc->max_burst == 0) ||
10100	    SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
10101	    (burst_cnt < asoc->max_burst)));
10102
10103	if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
10104		if ((asoc->max_burst > 0) && (burst_cnt >= asoc->max_burst)) {
10105			SCTP_STAT_INCR(sctps_maxburstqueued);
10106			asoc->burst_limit_applied = 1;
10107			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10108				sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
10109			}
10110		} else {
10111			asoc->burst_limit_applied = 0;
10112		}
10113	}
10114	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10115		sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
10116	}
10117	SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
10118	    tot_out);
10119
10120	/*-
10121	 * Now we need to clean up the control chunk chain if a ECNE is on
10122	 * it. It must be marked as UNSENT again so next call will continue
10123	 * to send it until such time that we get a CWR, to remove it.
10124	 */
10125	if (stcb->asoc.ecn_echo_cnt_onq)
10126		sctp_fix_ecn_echo(asoc);
10127	return;
10128}
10129
10130
10131int
10132sctp_output(
10133    struct sctp_inpcb *inp,
10134    struct mbuf *m,
10135    struct sockaddr *addr,
10136    struct mbuf *control,
10137    struct thread *p,
10138    int flags)
10139{
10140	if (inp == NULL) {
10141		SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10142		return (EINVAL);
10143	}
10144	if (inp->sctp_socket == NULL) {
10145		SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10146		return (EINVAL);
10147	}
10148	return (sctp_sosend(inp->sctp_socket,
10149	    addr,
10150	    (struct uio *)NULL,
10151	    m,
10152	    control,
10153	    flags, p
10154	    ));
10155}
10156
10157void
10158send_forward_tsn(struct sctp_tcb *stcb,
10159    struct sctp_association *asoc)
10160{
10161	struct sctp_tmit_chunk *chk;
10162	struct sctp_forward_tsn_chunk *fwdtsn;
10163	uint32_t advance_peer_ack_point;
10164
10165	SCTP_TCB_LOCK_ASSERT(stcb);
10166	TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10167		if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
10168			/* mark it to unsent */
10169			chk->sent = SCTP_DATAGRAM_UNSENT;
10170			chk->snd_count = 0;
10171			/* Do we correct its output location? */
10172			if (chk->whoTo) {
10173				sctp_free_remote_addr(chk->whoTo);
10174				chk->whoTo = NULL;
10175			}
10176			goto sctp_fill_in_rest;
10177		}
10178	}
10179	/* Ok if we reach here we must build one */
10180	sctp_alloc_a_chunk(stcb, chk);
10181	if (chk == NULL) {
10182		return;
10183	}
10184	asoc->fwd_tsn_cnt++;
10185	chk->copy_by_ref = 0;
10186	chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
10187	chk->rec.chunk_id.can_take_data = 0;
10188	chk->flags = 0;
10189	chk->asoc = asoc;
10190	chk->whoTo = NULL;
10191	chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
10192	if (chk->data == NULL) {
10193		sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
10194		return;
10195	}
10196	SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10197	chk->sent = SCTP_DATAGRAM_UNSENT;
10198	chk->snd_count = 0;
10199	TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
10200	asoc->ctrl_queue_cnt++;
10201sctp_fill_in_rest:
10202	/*-
10203	 * Here we go through and fill out the part that deals with
10204	 * stream/seq of the ones we skip.
10205	 */
10206	SCTP_BUF_LEN(chk->data) = 0;
10207	{
10208		struct sctp_tmit_chunk *at, *tp1, *last;
10209		struct sctp_strseq *strseq;
10210		unsigned int cnt_of_space, i, ovh;
10211		unsigned int space_needed;
10212		unsigned int cnt_of_skipped = 0;
10213
10214		TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10215			if ((at->sent != SCTP_FORWARD_TSN_SKIP) &&
10216			    (at->sent != SCTP_DATAGRAM_NR_ACKED)) {
10217				/* no more to look at */
10218				break;
10219			}
10220			if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10221				/* We don't report these */
10222				continue;
10223			}
10224			cnt_of_skipped++;
10225		}
10226		space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10227		    (cnt_of_skipped * sizeof(struct sctp_strseq)));
10228
10229		cnt_of_space = M_TRAILINGSPACE(chk->data);
10230
10231		if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
10232			ovh = SCTP_MIN_OVERHEAD;
10233		} else {
10234			ovh = SCTP_MIN_V4_OVERHEAD;
10235		}
10236		if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
10237			/* trim to a mtu size */
10238			cnt_of_space = asoc->smallest_mtu - ovh;
10239		}
10240		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10241			sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10242			    0xff, 0, cnt_of_skipped,
10243			    asoc->advanced_peer_ack_point);
10244
10245		}
10246		advance_peer_ack_point = asoc->advanced_peer_ack_point;
10247		if (cnt_of_space < space_needed) {
10248			/*-
10249			 * ok we must trim down the chunk by lowering the
10250			 * advance peer ack point.
10251			 */
10252			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10253				sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10254				    0xff, 0xff, cnt_of_space,
10255				    space_needed);
10256			}
10257			cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
10258			cnt_of_skipped /= sizeof(struct sctp_strseq);
10259			/*-
10260			 * Go through and find the TSN that will be the one
10261			 * we report.
10262			 */
10263			at = TAILQ_FIRST(&asoc->sent_queue);
10264			if (at != NULL) {
10265				for (i = 0; i < cnt_of_skipped; i++) {
10266					tp1 = TAILQ_NEXT(at, sctp_next);
10267					if (tp1 == NULL) {
10268						break;
10269					}
10270					at = tp1;
10271				}
10272			}
10273			if (at && SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10274				sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10275				    0xff, cnt_of_skipped, at->rec.data.TSN_seq,
10276				    asoc->advanced_peer_ack_point);
10277			}
10278			last = at;
10279			/*-
10280			 * last now points to last one I can report, update
10281			 * peer ack point
10282			 */
10283			if (last)
10284				advance_peer_ack_point = last->rec.data.TSN_seq;
10285			space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10286			    cnt_of_skipped * sizeof(struct sctp_strseq);
10287		}
10288		chk->send_size = space_needed;
10289		/* Setup the chunk */
10290		fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
10291		fwdtsn->ch.chunk_length = htons(chk->send_size);
10292		fwdtsn->ch.chunk_flags = 0;
10293		fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
10294		fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
10295		SCTP_BUF_LEN(chk->data) = chk->send_size;
10296		fwdtsn++;
10297		/*-
10298		 * Move pointer to after the fwdtsn and transfer to the
10299		 * strseq pointer.
10300		 */
10301		strseq = (struct sctp_strseq *)fwdtsn;
10302		/*-
10303		 * Now populate the strseq list. This is done blindly
10304		 * without pulling out duplicate stream info. This is
10305		 * inefficent but won't harm the process since the peer will
10306		 * look at these in sequence and will thus release anything.
10307		 * It could mean we exceed the PMTU and chop off some that
10308		 * we could have included.. but this is unlikely (aka 1432/4
10309		 * would mean 300+ stream seq's would have to be reported in
10310		 * one FWD-TSN. With a bit of work we can later FIX this to
10311		 * optimize and pull out duplcates.. but it does add more
10312		 * overhead. So for now... not!
10313		 */
10314		at = TAILQ_FIRST(&asoc->sent_queue);
10315		for (i = 0; i < cnt_of_skipped; i++) {
10316			tp1 = TAILQ_NEXT(at, sctp_next);
10317			if (tp1 == NULL)
10318				break;
10319			if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10320				/* We don't report these */
10321				i--;
10322				at = tp1;
10323				continue;
10324			}
10325			if (at->rec.data.TSN_seq == advance_peer_ack_point) {
10326				at->rec.data.fwd_tsn_cnt = 0;
10327			}
10328			strseq->stream = ntohs(at->rec.data.stream_number);
10329			strseq->sequence = ntohs(at->rec.data.stream_seq);
10330			strseq++;
10331			at = tp1;
10332		}
10333	}
10334	return;
10335}
10336
10337void
10338sctp_send_sack(struct sctp_tcb *stcb, int so_locked
10339#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10340    SCTP_UNUSED
10341#endif
10342)
10343{
10344	/*-
10345	 * Queue up a SACK or NR-SACK in the control queue.
10346	 * We must first check to see if a SACK or NR-SACK is
10347	 * somehow on the control queue.
10348	 * If so, we will take and and remove the old one.
10349	 */
10350	struct sctp_association *asoc;
10351	struct sctp_tmit_chunk *chk, *a_chk;
10352	struct sctp_sack_chunk *sack;
10353	struct sctp_nr_sack_chunk *nr_sack;
10354	struct sctp_gap_ack_block *gap_descriptor;
10355	struct sack_track *selector;
10356	int mergeable = 0;
10357	int offset;
10358	caddr_t limit;
10359	uint32_t *dup;
10360	int limit_reached = 0;
10361	unsigned int i, siz, j;
10362	unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
10363	int num_dups = 0;
10364	int space_req;
10365	uint32_t highest_tsn;
10366	uint8_t flags;
10367	uint8_t type;
10368	uint8_t tsn_map;
10369
10370	if (stcb->asoc.nrsack_supported == 1) {
10371		type = SCTP_NR_SELECTIVE_ACK;
10372	} else {
10373		type = SCTP_SELECTIVE_ACK;
10374	}
10375	a_chk = NULL;
10376	asoc = &stcb->asoc;
10377	SCTP_TCB_LOCK_ASSERT(stcb);
10378	if (asoc->last_data_chunk_from == NULL) {
10379		/* Hmm we never received anything */
10380		return;
10381	}
10382	sctp_slide_mapping_arrays(stcb);
10383	sctp_set_rwnd(stcb, asoc);
10384	TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10385		if (chk->rec.chunk_id.id == type) {
10386			/* Hmm, found a sack already on queue, remove it */
10387			TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
10388			asoc->ctrl_queue_cnt--;
10389			a_chk = chk;
10390			if (a_chk->data) {
10391				sctp_m_freem(a_chk->data);
10392				a_chk->data = NULL;
10393			}
10394			if (a_chk->whoTo) {
10395				sctp_free_remote_addr(a_chk->whoTo);
10396				a_chk->whoTo = NULL;
10397			}
10398			break;
10399		}
10400	}
10401	if (a_chk == NULL) {
10402		sctp_alloc_a_chunk(stcb, a_chk);
10403		if (a_chk == NULL) {
10404			/* No memory so we drop the idea, and set a timer */
10405			if (stcb->asoc.delayed_ack) {
10406				sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10407				    stcb->sctp_ep, stcb, NULL,
10408				    SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_3);
10409				sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10410				    stcb->sctp_ep, stcb, NULL);
10411			} else {
10412				stcb->asoc.send_sack = 1;
10413			}
10414			return;
10415		}
10416		a_chk->copy_by_ref = 0;
10417		a_chk->rec.chunk_id.id = type;
10418		a_chk->rec.chunk_id.can_take_data = 1;
10419	}
10420	/* Clear our pkt counts */
10421	asoc->data_pkts_seen = 0;
10422
10423	a_chk->flags = 0;
10424	a_chk->asoc = asoc;
10425	a_chk->snd_count = 0;
10426	a_chk->send_size = 0;	/* fill in later */
10427	a_chk->sent = SCTP_DATAGRAM_UNSENT;
10428	a_chk->whoTo = NULL;
10429
10430	if (!(asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE)) {
10431		/*-
10432		 * Ok, the destination for the SACK is unreachable, lets see if
10433		 * we can select an alternate to asoc->last_data_chunk_from
10434		 */
10435		a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
10436		if (a_chk->whoTo == NULL) {
10437			/* Nope, no alternate */
10438			a_chk->whoTo = asoc->last_data_chunk_from;
10439		}
10440	} else {
10441		a_chk->whoTo = asoc->last_data_chunk_from;
10442	}
10443	if (a_chk->whoTo) {
10444		atomic_add_int(&a_chk->whoTo->ref_count, 1);
10445	}
10446	if (SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->highest_tsn_inside_nr_map)) {
10447		highest_tsn = asoc->highest_tsn_inside_map;
10448	} else {
10449		highest_tsn = asoc->highest_tsn_inside_nr_map;
10450	}
10451	if (highest_tsn == asoc->cumulative_tsn) {
10452		/* no gaps */
10453		if (type == SCTP_SELECTIVE_ACK) {
10454			space_req = sizeof(struct sctp_sack_chunk);
10455		} else {
10456			space_req = sizeof(struct sctp_nr_sack_chunk);
10457		}
10458	} else {
10459		/* gaps get a cluster */
10460		space_req = MCLBYTES;
10461	}
10462	/* Ok now lets formulate a MBUF with our sack */
10463	a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_NOWAIT, 1, MT_DATA);
10464	if ((a_chk->data == NULL) ||
10465	    (a_chk->whoTo == NULL)) {
10466		/* rats, no mbuf memory */
10467		if (a_chk->data) {
10468			/* was a problem with the destination */
10469			sctp_m_freem(a_chk->data);
10470			a_chk->data = NULL;
10471		}
10472		sctp_free_a_chunk(stcb, a_chk, so_locked);
10473		/* sa_ignore NO_NULL_CHK */
10474		if (stcb->asoc.delayed_ack) {
10475			sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10476			    stcb->sctp_ep, stcb, NULL,
10477			    SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
10478			sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10479			    stcb->sctp_ep, stcb, NULL);
10480		} else {
10481			stcb->asoc.send_sack = 1;
10482		}
10483		return;
10484	}
10485	/* ok, lets go through and fill it in */
10486	SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10487	space = M_TRAILINGSPACE(a_chk->data);
10488	if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10489		space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10490	}
10491	limit = mtod(a_chk->data, caddr_t);
10492	limit += space;
10493
10494	flags = 0;
10495
10496	if ((asoc->sctp_cmt_on_off > 0) &&
10497	    SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10498		/*-
10499		 * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10500		 * received, then set high bit to 1, else 0. Reset
10501		 * pkts_rcvd.
10502		 */
10503		flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10504		asoc->cmt_dac_pkts_rcvd = 0;
10505	}
10506#ifdef SCTP_ASOCLOG_OF_TSNS
10507	stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10508	stcb->asoc.cumack_log_atsnt++;
10509	if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10510		stcb->asoc.cumack_log_atsnt = 0;
10511	}
10512#endif
10513	/* reset the readers interpretation */
10514	stcb->freed_by_sorcv_sincelast = 0;
10515
10516	if (type == SCTP_SELECTIVE_ACK) {
10517		sack = mtod(a_chk->data, struct sctp_sack_chunk *);
10518		nr_sack = NULL;
10519		gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
10520		if (highest_tsn > asoc->mapping_array_base_tsn) {
10521			siz = (((highest_tsn - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10522		} else {
10523			siz = (((MAX_TSN - highest_tsn) + 1) + highest_tsn + 7) / 8;
10524		}
10525	} else {
10526		sack = NULL;
10527		nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
10528		gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
10529		if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn) {
10530			siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10531		} else {
10532			siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10533		}
10534	}
10535
10536	if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10537		offset = 1;
10538	} else {
10539		offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10540	}
10541	if (((type == SCTP_SELECTIVE_ACK) &&
10542	    SCTP_TSN_GT(highest_tsn, asoc->cumulative_tsn)) ||
10543	    ((type == SCTP_NR_SELECTIVE_ACK) &&
10544	    SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->cumulative_tsn))) {
10545		/* we have a gap .. maybe */
10546		for (i = 0; i < siz; i++) {
10547			tsn_map = asoc->mapping_array[i];
10548			if (type == SCTP_SELECTIVE_ACK) {
10549				tsn_map |= asoc->nr_mapping_array[i];
10550			}
10551			if (i == 0) {
10552				/*
10553				 * Clear all bits corresponding to TSNs
10554				 * smaller or equal to the cumulative TSN.
10555				 */
10556				tsn_map &= (~0 << (1 - offset));
10557			}
10558			selector = &sack_array[tsn_map];
10559			if (mergeable && selector->right_edge) {
10560				/*
10561				 * Backup, left and right edges were ok to
10562				 * merge.
10563				 */
10564				num_gap_blocks--;
10565				gap_descriptor--;
10566			}
10567			if (selector->num_entries == 0)
10568				mergeable = 0;
10569			else {
10570				for (j = 0; j < selector->num_entries; j++) {
10571					if (mergeable && selector->right_edge) {
10572						/*
10573						 * do a merge by NOT setting
10574						 * the left side
10575						 */
10576						mergeable = 0;
10577					} else {
10578						/*
10579						 * no merge, set the left
10580						 * side
10581						 */
10582						mergeable = 0;
10583						gap_descriptor->start = htons((selector->gaps[j].start + offset));
10584					}
10585					gap_descriptor->end = htons((selector->gaps[j].end + offset));
10586					num_gap_blocks++;
10587					gap_descriptor++;
10588					if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10589						/* no more room */
10590						limit_reached = 1;
10591						break;
10592					}
10593				}
10594				if (selector->left_edge) {
10595					mergeable = 1;
10596				}
10597			}
10598			if (limit_reached) {
10599				/* Reached the limit stop */
10600				break;
10601			}
10602			offset += 8;
10603		}
10604	}
10605	if ((type == SCTP_NR_SELECTIVE_ACK) &&
10606	    (limit_reached == 0)) {
10607
10608		mergeable = 0;
10609
10610		if (asoc->highest_tsn_inside_nr_map > asoc->mapping_array_base_tsn) {
10611			siz = (((asoc->highest_tsn_inside_nr_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10612		} else {
10613			siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10614		}
10615
10616		if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10617			offset = 1;
10618		} else {
10619			offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10620		}
10621		if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn)) {
10622			/* we have a gap .. maybe */
10623			for (i = 0; i < siz; i++) {
10624				tsn_map = asoc->nr_mapping_array[i];
10625				if (i == 0) {
10626					/*
10627					 * Clear all bits corresponding to
10628					 * TSNs smaller or equal to the
10629					 * cumulative TSN.
10630					 */
10631					tsn_map &= (~0 << (1 - offset));
10632				}
10633				selector = &sack_array[tsn_map];
10634				if (mergeable && selector->right_edge) {
10635					/*
10636					 * Backup, left and right edges were
10637					 * ok to merge.
10638					 */
10639					num_nr_gap_blocks--;
10640					gap_descriptor--;
10641				}
10642				if (selector->num_entries == 0)
10643					mergeable = 0;
10644				else {
10645					for (j = 0; j < selector->num_entries; j++) {
10646						if (mergeable && selector->right_edge) {
10647							/*
10648							 * do a merge by NOT
10649							 * setting the left
10650							 * side
10651							 */
10652							mergeable = 0;
10653						} else {
10654							/*
10655							 * no merge, set the
10656							 * left side
10657							 */
10658							mergeable = 0;
10659							gap_descriptor->start = htons((selector->gaps[j].start + offset));
10660						}
10661						gap_descriptor->end = htons((selector->gaps[j].end + offset));
10662						num_nr_gap_blocks++;
10663						gap_descriptor++;
10664						if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10665							/* no more room */
10666							limit_reached = 1;
10667							break;
10668						}
10669					}
10670					if (selector->left_edge) {
10671						mergeable = 1;
10672					}
10673				}
10674				if (limit_reached) {
10675					/* Reached the limit stop */
10676					break;
10677				}
10678				offset += 8;
10679			}
10680		}
10681	}
10682	/* now we must add any dups we are going to report. */
10683	if ((limit_reached == 0) && (asoc->numduptsns)) {
10684		dup = (uint32_t *) gap_descriptor;
10685		for (i = 0; i < asoc->numduptsns; i++) {
10686			*dup = htonl(asoc->dup_tsns[i]);
10687			dup++;
10688			num_dups++;
10689			if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10690				/* no more room */
10691				break;
10692			}
10693		}
10694		asoc->numduptsns = 0;
10695	}
10696	/*
10697	 * now that the chunk is prepared queue it to the control chunk
10698	 * queue.
10699	 */
10700	if (type == SCTP_SELECTIVE_ACK) {
10701		a_chk->send_size = sizeof(struct sctp_sack_chunk) +
10702		    (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10703		    num_dups * sizeof(int32_t);
10704		SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10705		sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10706		sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10707		sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10708		sack->sack.num_dup_tsns = htons(num_dups);
10709		sack->ch.chunk_type = type;
10710		sack->ch.chunk_flags = flags;
10711		sack->ch.chunk_length = htons(a_chk->send_size);
10712	} else {
10713		a_chk->send_size = sizeof(struct sctp_nr_sack_chunk) +
10714		    (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10715		    num_dups * sizeof(int32_t);
10716		SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10717		nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10718		nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10719		nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10720		nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10721		nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10722		nr_sack->nr_sack.reserved = 0;
10723		nr_sack->ch.chunk_type = type;
10724		nr_sack->ch.chunk_flags = flags;
10725		nr_sack->ch.chunk_length = htons(a_chk->send_size);
10726	}
10727	TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10728	asoc->my_last_reported_rwnd = asoc->my_rwnd;
10729	asoc->ctrl_queue_cnt++;
10730	asoc->send_sack = 0;
10731	SCTP_STAT_INCR(sctps_sendsacks);
10732	return;
10733}
10734
10735void
10736sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked
10737#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10738    SCTP_UNUSED
10739#endif
10740)
10741{
10742	struct mbuf *m_abort, *m, *m_last;
10743	struct mbuf *m_out, *m_end = NULL;
10744	struct sctp_abort_chunk *abort;
10745	struct sctp_auth_chunk *auth = NULL;
10746	struct sctp_nets *net;
10747	uint32_t vtag;
10748	uint32_t auth_offset = 0;
10749	uint16_t cause_len, chunk_len, padding_len;
10750
10751	SCTP_TCB_LOCK_ASSERT(stcb);
10752	/*-
10753	 * Add an AUTH chunk, if chunk requires it and save the offset into
10754	 * the chain for AUTH
10755	 */
10756	if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10757	    stcb->asoc.peer_auth_chunks)) {
10758		m_out = sctp_add_auth_chunk(NULL, &m_end, &auth, &auth_offset,
10759		    stcb, SCTP_ABORT_ASSOCIATION);
10760		SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10761	} else {
10762		m_out = NULL;
10763	}
10764	m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_NOWAIT, 1, MT_HEADER);
10765	if (m_abort == NULL) {
10766		if (m_out) {
10767			sctp_m_freem(m_out);
10768		}
10769		if (operr) {
10770			sctp_m_freem(operr);
10771		}
10772		return;
10773	}
10774	/* link in any error */
10775	SCTP_BUF_NEXT(m_abort) = operr;
10776	cause_len = 0;
10777	m_last = NULL;
10778	for (m = operr; m; m = SCTP_BUF_NEXT(m)) {
10779		cause_len += (uint16_t) SCTP_BUF_LEN(m);
10780		if (SCTP_BUF_NEXT(m) == NULL) {
10781			m_last = m;
10782		}
10783	}
10784	SCTP_BUF_LEN(m_abort) = sizeof(struct sctp_abort_chunk);
10785	chunk_len = (uint16_t) sizeof(struct sctp_abort_chunk) + cause_len;
10786	padding_len = SCTP_SIZE32(chunk_len) - chunk_len;
10787	if (m_out == NULL) {
10788		/* NO Auth chunk prepended, so reserve space in front */
10789		SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10790		m_out = m_abort;
10791	} else {
10792		/* Put AUTH chunk at the front of the chain */
10793		SCTP_BUF_NEXT(m_end) = m_abort;
10794	}
10795	if (stcb->asoc.alternate) {
10796		net = stcb->asoc.alternate;
10797	} else {
10798		net = stcb->asoc.primary_destination;
10799	}
10800	/* Fill in the ABORT chunk header. */
10801	abort = mtod(m_abort, struct sctp_abort_chunk *);
10802	abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10803	if (stcb->asoc.peer_vtag == 0) {
10804		/* This happens iff the assoc is in COOKIE-WAIT state. */
10805		vtag = stcb->asoc.my_vtag;
10806		abort->ch.chunk_flags = SCTP_HAD_NO_TCB;
10807	} else {
10808		vtag = stcb->asoc.peer_vtag;
10809		abort->ch.chunk_flags = 0;
10810	}
10811	abort->ch.chunk_length = htons(chunk_len);
10812	/* Add padding, if necessary. */
10813	if (padding_len > 0) {
10814		if ((m_last == NULL) ||
10815		    (sctp_add_pad_tombuf(m_last, padding_len) == NULL)) {
10816			sctp_m_freem(m_out);
10817			return;
10818		}
10819	}
10820	(void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10821	    (struct sockaddr *)&net->ro._l_addr,
10822	    m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, 0,
10823	    stcb->sctp_ep->sctp_lport, stcb->rport, htonl(vtag),
10824	    stcb->asoc.primary_destination->port, NULL,
10825	    0, 0,
10826	    so_locked);
10827	SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10828}
10829
10830void
10831sctp_send_shutdown_complete(struct sctp_tcb *stcb,
10832    struct sctp_nets *net,
10833    int reflect_vtag)
10834{
10835	/* formulate and SEND a SHUTDOWN-COMPLETE */
10836	struct mbuf *m_shutdown_comp;
10837	struct sctp_shutdown_complete_chunk *shutdown_complete;
10838	uint32_t vtag;
10839	uint8_t flags;
10840
10841	m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
10842	if (m_shutdown_comp == NULL) {
10843		/* no mbuf's */
10844		return;
10845	}
10846	if (reflect_vtag) {
10847		flags = SCTP_HAD_NO_TCB;
10848		vtag = stcb->asoc.my_vtag;
10849	} else {
10850		flags = 0;
10851		vtag = stcb->asoc.peer_vtag;
10852	}
10853	shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
10854	shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
10855	shutdown_complete->ch.chunk_flags = flags;
10856	shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
10857	SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
10858	(void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10859	    (struct sockaddr *)&net->ro._l_addr,
10860	    m_shutdown_comp, 0, NULL, 0, 1, 0, 0,
10861	    stcb->sctp_ep->sctp_lport, stcb->rport,
10862	    htonl(vtag),
10863	    net->port, NULL,
10864	    0, 0,
10865	    SCTP_SO_NOT_LOCKED);
10866	SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10867	return;
10868}
10869
10870static void
10871sctp_send_resp_msg(struct sockaddr *src, struct sockaddr *dst,
10872    struct sctphdr *sh, uint32_t vtag,
10873    uint8_t type, struct mbuf *cause,
10874    uint8_t mflowtype, uint32_t mflowid,
10875    uint32_t vrf_id, uint16_t port)
10876{
10877	struct mbuf *o_pak;
10878	struct mbuf *mout;
10879	struct sctphdr *shout;
10880	struct sctp_chunkhdr *ch;
10881
10882#if defined(INET) || defined(INET6)
10883	struct udphdr *udp;
10884	int ret;
10885
10886#endif
10887	int len, cause_len, padding_len;
10888
10889#ifdef INET
10890	struct sockaddr_in *src_sin, *dst_sin;
10891	struct ip *ip;
10892
10893#endif
10894#ifdef INET6
10895	struct sockaddr_in6 *src_sin6, *dst_sin6;
10896	struct ip6_hdr *ip6;
10897
10898#endif
10899
10900	/* Compute the length of the cause and add final padding. */
10901	cause_len = 0;
10902	if (cause != NULL) {
10903		struct mbuf *m_at, *m_last = NULL;
10904
10905		for (m_at = cause; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
10906			if (SCTP_BUF_NEXT(m_at) == NULL)
10907				m_last = m_at;
10908			cause_len += SCTP_BUF_LEN(m_at);
10909		}
10910		padding_len = cause_len % 4;
10911		if (padding_len != 0) {
10912			padding_len = 4 - padding_len;
10913		}
10914		if (padding_len != 0) {
10915			if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
10916				sctp_m_freem(cause);
10917				return;
10918			}
10919		}
10920	} else {
10921		padding_len = 0;
10922	}
10923	/* Get an mbuf for the header. */
10924	len = sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
10925	switch (dst->sa_family) {
10926#ifdef INET
10927	case AF_INET:
10928		len += sizeof(struct ip);
10929		break;
10930#endif
10931#ifdef INET6
10932	case AF_INET6:
10933		len += sizeof(struct ip6_hdr);
10934		break;
10935#endif
10936	default:
10937		break;
10938	}
10939#if defined(INET) || defined(INET6)
10940	if (port) {
10941		len += sizeof(struct udphdr);
10942	}
10943#endif
10944	mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_NOWAIT, 1, MT_DATA);
10945	if (mout == NULL) {
10946		if (cause) {
10947			sctp_m_freem(cause);
10948		}
10949		return;
10950	}
10951	SCTP_BUF_RESV_UF(mout, max_linkhdr);
10952	SCTP_BUF_LEN(mout) = len;
10953	SCTP_BUF_NEXT(mout) = cause;
10954	mout->m_pkthdr.flowid = mflowid;
10955	M_HASHTYPE_SET(mout, mflowtype);
10956#ifdef INET
10957	ip = NULL;
10958#endif
10959#ifdef INET6
10960	ip6 = NULL;
10961#endif
10962	switch (dst->sa_family) {
10963#ifdef INET
10964	case AF_INET:
10965		src_sin = (struct sockaddr_in *)src;
10966		dst_sin = (struct sockaddr_in *)dst;
10967		ip = mtod(mout, struct ip *);
10968		ip->ip_v = IPVERSION;
10969		ip->ip_hl = (sizeof(struct ip) >> 2);
10970		ip->ip_tos = 0;
10971		ip->ip_id = ip_newid();
10972		ip->ip_off = 0;
10973		ip->ip_ttl = MODULE_GLOBAL(ip_defttl);
10974		if (port) {
10975			ip->ip_p = IPPROTO_UDP;
10976		} else {
10977			ip->ip_p = IPPROTO_SCTP;
10978		}
10979		ip->ip_src.s_addr = dst_sin->sin_addr.s_addr;
10980		ip->ip_dst.s_addr = src_sin->sin_addr.s_addr;
10981		ip->ip_sum = 0;
10982		len = sizeof(struct ip);
10983		shout = (struct sctphdr *)((caddr_t)ip + len);
10984		break;
10985#endif
10986#ifdef INET6
10987	case AF_INET6:
10988		src_sin6 = (struct sockaddr_in6 *)src;
10989		dst_sin6 = (struct sockaddr_in6 *)dst;
10990		ip6 = mtod(mout, struct ip6_hdr *);
10991		ip6->ip6_flow = htonl(0x60000000);
10992		if (V_ip6_auto_flowlabel) {
10993			ip6->ip6_flow |= (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
10994		}
10995		ip6->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
10996		if (port) {
10997			ip6->ip6_nxt = IPPROTO_UDP;
10998		} else {
10999			ip6->ip6_nxt = IPPROTO_SCTP;
11000		}
11001		ip6->ip6_src = dst_sin6->sin6_addr;
11002		ip6->ip6_dst = src_sin6->sin6_addr;
11003		len = sizeof(struct ip6_hdr);
11004		shout = (struct sctphdr *)((caddr_t)ip6 + len);
11005		break;
11006#endif
11007	default:
11008		len = 0;
11009		shout = mtod(mout, struct sctphdr *);
11010		break;
11011	}
11012#if defined(INET) || defined(INET6)
11013	if (port) {
11014		if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
11015			sctp_m_freem(mout);
11016			return;
11017		}
11018		udp = (struct udphdr *)shout;
11019		udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
11020		udp->uh_dport = port;
11021		udp->uh_sum = 0;
11022		udp->uh_ulen = htons(sizeof(struct udphdr) +
11023		    sizeof(struct sctphdr) +
11024		    sizeof(struct sctp_chunkhdr) +
11025		    cause_len + padding_len);
11026		len += sizeof(struct udphdr);
11027		shout = (struct sctphdr *)((caddr_t)shout + sizeof(struct udphdr));
11028	} else {
11029		udp = NULL;
11030	}
11031#endif
11032	shout->src_port = sh->dest_port;
11033	shout->dest_port = sh->src_port;
11034	shout->checksum = 0;
11035	if (vtag) {
11036		shout->v_tag = htonl(vtag);
11037	} else {
11038		shout->v_tag = sh->v_tag;
11039	}
11040	len += sizeof(struct sctphdr);
11041	ch = (struct sctp_chunkhdr *)((caddr_t)shout + sizeof(struct sctphdr));
11042	ch->chunk_type = type;
11043	if (vtag) {
11044		ch->chunk_flags = 0;
11045	} else {
11046		ch->chunk_flags = SCTP_HAD_NO_TCB;
11047	}
11048	ch->chunk_length = htons(sizeof(struct sctp_chunkhdr) + cause_len);
11049	len += sizeof(struct sctp_chunkhdr);
11050	len += cause_len + padding_len;
11051
11052	if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
11053		sctp_m_freem(mout);
11054		return;
11055	}
11056	SCTP_ATTACH_CHAIN(o_pak, mout, len);
11057	switch (dst->sa_family) {
11058#ifdef INET
11059	case AF_INET:
11060		if (port) {
11061			if (V_udp_cksum) {
11062				udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
11063			} else {
11064				udp->uh_sum = 0;
11065			}
11066		}
11067		ip->ip_len = htons(len);
11068		if (port) {
11069#if defined(SCTP_WITH_NO_CSUM)
11070			SCTP_STAT_INCR(sctps_sendnocrc);
11071#else
11072			shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip) + sizeof(struct udphdr));
11073			SCTP_STAT_INCR(sctps_sendswcrc);
11074#endif
11075			if (V_udp_cksum) {
11076				SCTP_ENABLE_UDP_CSUM(o_pak);
11077			}
11078		} else {
11079#if defined(SCTP_WITH_NO_CSUM)
11080			SCTP_STAT_INCR(sctps_sendnocrc);
11081#else
11082			mout->m_pkthdr.csum_flags = CSUM_SCTP;
11083			mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11084			SCTP_STAT_INCR(sctps_sendhwcrc);
11085#endif
11086		}
11087#ifdef SCTP_PACKET_LOGGING
11088		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11089			sctp_packet_log(o_pak);
11090		}
11091#endif
11092		SCTP_IP_OUTPUT(ret, o_pak, NULL, NULL, vrf_id);
11093		break;
11094#endif
11095#ifdef INET6
11096	case AF_INET6:
11097		ip6->ip6_plen = len - sizeof(struct ip6_hdr);
11098		if (port) {
11099#if defined(SCTP_WITH_NO_CSUM)
11100			SCTP_STAT_INCR(sctps_sendnocrc);
11101#else
11102			shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11103			SCTP_STAT_INCR(sctps_sendswcrc);
11104#endif
11105			if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11106				udp->uh_sum = 0xffff;
11107			}
11108		} else {
11109#if defined(SCTP_WITH_NO_CSUM)
11110			SCTP_STAT_INCR(sctps_sendnocrc);
11111#else
11112			mout->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
11113			mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11114			SCTP_STAT_INCR(sctps_sendhwcrc);
11115#endif
11116		}
11117#ifdef SCTP_PACKET_LOGGING
11118		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11119			sctp_packet_log(o_pak);
11120		}
11121#endif
11122		SCTP_IP6_OUTPUT(ret, o_pak, NULL, NULL, NULL, vrf_id);
11123		break;
11124#endif
11125	default:
11126		SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
11127		    dst->sa_family);
11128		sctp_m_freem(mout);
11129		SCTP_LTRACE_ERR_RET_PKT(mout, NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11130		return;
11131	}
11132	SCTP_STAT_INCR(sctps_sendpackets);
11133	SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11134	SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11135	return;
11136}
11137
11138void
11139sctp_send_shutdown_complete2(struct sockaddr *src, struct sockaddr *dst,
11140    struct sctphdr *sh,
11141    uint8_t mflowtype, uint32_t mflowid,
11142    uint32_t vrf_id, uint16_t port)
11143{
11144	sctp_send_resp_msg(src, dst, sh, 0, SCTP_SHUTDOWN_COMPLETE, NULL,
11145	    mflowtype, mflowid,
11146	    vrf_id, port);
11147}
11148
11149void
11150sctp_send_hb(struct sctp_tcb *stcb, struct sctp_nets *net, int so_locked
11151#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
11152    SCTP_UNUSED
11153#endif
11154)
11155{
11156	struct sctp_tmit_chunk *chk;
11157	struct sctp_heartbeat_chunk *hb;
11158	struct timeval now;
11159
11160	SCTP_TCB_LOCK_ASSERT(stcb);
11161	if (net == NULL) {
11162		return;
11163	}
11164	(void)SCTP_GETTIME_TIMEVAL(&now);
11165	switch (net->ro._l_addr.sa.sa_family) {
11166#ifdef INET
11167	case AF_INET:
11168		break;
11169#endif
11170#ifdef INET6
11171	case AF_INET6:
11172		break;
11173#endif
11174	default:
11175		return;
11176	}
11177	sctp_alloc_a_chunk(stcb, chk);
11178	if (chk == NULL) {
11179		SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
11180		return;
11181	}
11182	chk->copy_by_ref = 0;
11183	chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
11184	chk->rec.chunk_id.can_take_data = 1;
11185	chk->flags = 0;
11186	chk->asoc = &stcb->asoc;
11187	chk->send_size = sizeof(struct sctp_heartbeat_chunk);
11188
11189	chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11190	if (chk->data == NULL) {
11191		sctp_free_a_chunk(stcb, chk, so_locked);
11192		return;
11193	}
11194	SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11195	SCTP_BUF_LEN(chk->data) = chk->send_size;
11196	chk->sent = SCTP_DATAGRAM_UNSENT;
11197	chk->snd_count = 0;
11198	chk->whoTo = net;
11199	atomic_add_int(&chk->whoTo->ref_count, 1);
11200	/* Now we have a mbuf that we can fill in with the details */
11201	hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
11202	memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
11203	/* fill out chunk header */
11204	hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
11205	hb->ch.chunk_flags = 0;
11206	hb->ch.chunk_length = htons(chk->send_size);
11207	/* Fill out hb parameter */
11208	hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
11209	hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
11210	hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
11211	hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
11212	/* Did our user request this one, put it in */
11213	hb->heartbeat.hb_info.addr_family = (uint8_t) net->ro._l_addr.sa.sa_family;
11214	hb->heartbeat.hb_info.addr_len = net->ro._l_addr.sa.sa_len;
11215	if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
11216		/*
11217		 * we only take from the entropy pool if the address is not
11218		 * confirmed.
11219		 */
11220		net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11221		net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11222	} else {
11223		net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
11224		net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
11225	}
11226	switch (net->ro._l_addr.sa.sa_family) {
11227#ifdef INET
11228	case AF_INET:
11229		memcpy(hb->heartbeat.hb_info.address,
11230		    &net->ro._l_addr.sin.sin_addr,
11231		    sizeof(net->ro._l_addr.sin.sin_addr));
11232		break;
11233#endif
11234#ifdef INET6
11235	case AF_INET6:
11236		memcpy(hb->heartbeat.hb_info.address,
11237		    &net->ro._l_addr.sin6.sin6_addr,
11238		    sizeof(net->ro._l_addr.sin6.sin6_addr));
11239		break;
11240#endif
11241	default:
11242		return;
11243		break;
11244	}
11245	net->hb_responded = 0;
11246	TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11247	stcb->asoc.ctrl_queue_cnt++;
11248	SCTP_STAT_INCR(sctps_sendheartbeat);
11249	return;
11250}
11251
11252void
11253sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
11254    uint32_t high_tsn)
11255{
11256	struct sctp_association *asoc;
11257	struct sctp_ecne_chunk *ecne;
11258	struct sctp_tmit_chunk *chk;
11259
11260	if (net == NULL) {
11261		return;
11262	}
11263	asoc = &stcb->asoc;
11264	SCTP_TCB_LOCK_ASSERT(stcb);
11265	TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11266		if ((chk->rec.chunk_id.id == SCTP_ECN_ECHO) && (net == chk->whoTo)) {
11267			/* found a previous ECN_ECHO update it if needed */
11268			uint32_t cnt, ctsn;
11269
11270			ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11271			ctsn = ntohl(ecne->tsn);
11272			if (SCTP_TSN_GT(high_tsn, ctsn)) {
11273				ecne->tsn = htonl(high_tsn);
11274				SCTP_STAT_INCR(sctps_queue_upd_ecne);
11275			}
11276			cnt = ntohl(ecne->num_pkts_since_cwr);
11277			cnt++;
11278			ecne->num_pkts_since_cwr = htonl(cnt);
11279			return;
11280		}
11281	}
11282	/* nope could not find one to update so we must build one */
11283	sctp_alloc_a_chunk(stcb, chk);
11284	if (chk == NULL) {
11285		return;
11286	}
11287	SCTP_STAT_INCR(sctps_queue_upd_ecne);
11288	chk->copy_by_ref = 0;
11289	chk->rec.chunk_id.id = SCTP_ECN_ECHO;
11290	chk->rec.chunk_id.can_take_data = 0;
11291	chk->flags = 0;
11292	chk->asoc = &stcb->asoc;
11293	chk->send_size = sizeof(struct sctp_ecne_chunk);
11294	chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11295	if (chk->data == NULL) {
11296		sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11297		return;
11298	}
11299	SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11300	SCTP_BUF_LEN(chk->data) = chk->send_size;
11301	chk->sent = SCTP_DATAGRAM_UNSENT;
11302	chk->snd_count = 0;
11303	chk->whoTo = net;
11304	atomic_add_int(&chk->whoTo->ref_count, 1);
11305
11306	stcb->asoc.ecn_echo_cnt_onq++;
11307	ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11308	ecne->ch.chunk_type = SCTP_ECN_ECHO;
11309	ecne->ch.chunk_flags = 0;
11310	ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
11311	ecne->tsn = htonl(high_tsn);
11312	ecne->num_pkts_since_cwr = htonl(1);
11313	TAILQ_INSERT_HEAD(&stcb->asoc.control_send_queue, chk, sctp_next);
11314	asoc->ctrl_queue_cnt++;
11315}
11316
11317void
11318sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
11319    struct mbuf *m, int len, int iphlen, int bad_crc)
11320{
11321	struct sctp_association *asoc;
11322	struct sctp_pktdrop_chunk *drp;
11323	struct sctp_tmit_chunk *chk;
11324	uint8_t *datap;
11325	int was_trunc = 0;
11326	int fullsz = 0;
11327	long spc;
11328	int offset;
11329	struct sctp_chunkhdr *ch, chunk_buf;
11330	unsigned int chk_length;
11331
11332	if (!stcb) {
11333		return;
11334	}
11335	asoc = &stcb->asoc;
11336	SCTP_TCB_LOCK_ASSERT(stcb);
11337	if (asoc->pktdrop_supported == 0) {
11338		/*-
11339		 * peer must declare support before I send one.
11340		 */
11341		return;
11342	}
11343	if (stcb->sctp_socket == NULL) {
11344		return;
11345	}
11346	sctp_alloc_a_chunk(stcb, chk);
11347	if (chk == NULL) {
11348		return;
11349	}
11350	chk->copy_by_ref = 0;
11351	chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
11352	chk->rec.chunk_id.can_take_data = 1;
11353	chk->flags = 0;
11354	len -= iphlen;
11355	chk->send_size = len;
11356	/* Validate that we do not have an ABORT in here. */
11357	offset = iphlen + sizeof(struct sctphdr);
11358	ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11359	    sizeof(*ch), (uint8_t *) & chunk_buf);
11360	while (ch != NULL) {
11361		chk_length = ntohs(ch->chunk_length);
11362		if (chk_length < sizeof(*ch)) {
11363			/* break to abort land */
11364			break;
11365		}
11366		switch (ch->chunk_type) {
11367		case SCTP_PACKET_DROPPED:
11368		case SCTP_ABORT_ASSOCIATION:
11369		case SCTP_INITIATION_ACK:
11370			/**
11371			 * We don't respond with an PKT-DROP to an ABORT
11372			 * or PKT-DROP. We also do not respond to an
11373			 * INIT-ACK, because we can't know if the initiation
11374			 * tag is correct or not.
11375			 */
11376			sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11377			return;
11378		default:
11379			break;
11380		}
11381		offset += SCTP_SIZE32(chk_length);
11382		ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11383		    sizeof(*ch), (uint8_t *) & chunk_buf);
11384	}
11385
11386	if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
11387	    min(stcb->asoc.smallest_mtu, MCLBYTES)) {
11388		/*
11389		 * only send 1 mtu worth, trim off the excess on the end.
11390		 */
11391		fullsz = len;
11392		len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
11393		was_trunc = 1;
11394	}
11395	chk->asoc = &stcb->asoc;
11396	chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11397	if (chk->data == NULL) {
11398jump_out:
11399		sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11400		return;
11401	}
11402	SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11403	drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
11404	if (drp == NULL) {
11405		sctp_m_freem(chk->data);
11406		chk->data = NULL;
11407		goto jump_out;
11408	}
11409	chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
11410	    sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
11411	chk->book_size_scale = 0;
11412	if (was_trunc) {
11413		drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
11414		drp->trunc_len = htons(fullsz);
11415		/*
11416		 * Len is already adjusted to size minus overhead above take
11417		 * out the pkt_drop chunk itself from it.
11418		 */
11419		chk->send_size = len - sizeof(struct sctp_pktdrop_chunk);
11420		len = chk->send_size;
11421	} else {
11422		/* no truncation needed */
11423		drp->ch.chunk_flags = 0;
11424		drp->trunc_len = htons(0);
11425	}
11426	if (bad_crc) {
11427		drp->ch.chunk_flags |= SCTP_BADCRC;
11428	}
11429	chk->send_size += sizeof(struct sctp_pktdrop_chunk);
11430	SCTP_BUF_LEN(chk->data) = chk->send_size;
11431	chk->sent = SCTP_DATAGRAM_UNSENT;
11432	chk->snd_count = 0;
11433	if (net) {
11434		/* we should hit here */
11435		chk->whoTo = net;
11436		atomic_add_int(&chk->whoTo->ref_count, 1);
11437	} else {
11438		chk->whoTo = NULL;
11439	}
11440	drp->ch.chunk_type = SCTP_PACKET_DROPPED;
11441	drp->ch.chunk_length = htons(chk->send_size);
11442	spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
11443	if (spc < 0) {
11444		spc = 0;
11445	}
11446	drp->bottle_bw = htonl(spc);
11447	if (asoc->my_rwnd) {
11448		drp->current_onq = htonl(asoc->size_on_reasm_queue +
11449		    asoc->size_on_all_streams +
11450		    asoc->my_rwnd_control_len +
11451		    stcb->sctp_socket->so_rcv.sb_cc);
11452	} else {
11453		/*-
11454		 * If my rwnd is 0, possibly from mbuf depletion as well as
11455		 * space used, tell the peer there is NO space aka onq == bw
11456		 */
11457		drp->current_onq = htonl(spc);
11458	}
11459	drp->reserved = 0;
11460	datap = drp->data;
11461	m_copydata(m, iphlen, len, (caddr_t)datap);
11462	TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11463	asoc->ctrl_queue_cnt++;
11464}
11465
11466void
11467sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn, uint8_t override)
11468{
11469	struct sctp_association *asoc;
11470	struct sctp_cwr_chunk *cwr;
11471	struct sctp_tmit_chunk *chk;
11472
11473	SCTP_TCB_LOCK_ASSERT(stcb);
11474	if (net == NULL) {
11475		return;
11476	}
11477	asoc = &stcb->asoc;
11478	TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11479		if ((chk->rec.chunk_id.id == SCTP_ECN_CWR) && (net == chk->whoTo)) {
11480			/*
11481			 * found a previous CWR queued to same destination
11482			 * update it if needed
11483			 */
11484			uint32_t ctsn;
11485
11486			cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11487			ctsn = ntohl(cwr->tsn);
11488			if (SCTP_TSN_GT(high_tsn, ctsn)) {
11489				cwr->tsn = htonl(high_tsn);
11490			}
11491			if (override & SCTP_CWR_REDUCE_OVERRIDE) {
11492				/* Make sure override is carried */
11493				cwr->ch.chunk_flags |= SCTP_CWR_REDUCE_OVERRIDE;
11494			}
11495			return;
11496		}
11497	}
11498	sctp_alloc_a_chunk(stcb, chk);
11499	if (chk == NULL) {
11500		return;
11501	}
11502	chk->copy_by_ref = 0;
11503	chk->rec.chunk_id.id = SCTP_ECN_CWR;
11504	chk->rec.chunk_id.can_take_data = 1;
11505	chk->flags = 0;
11506	chk->asoc = &stcb->asoc;
11507	chk->send_size = sizeof(struct sctp_cwr_chunk);
11508	chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11509	if (chk->data == NULL) {
11510		sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11511		return;
11512	}
11513	SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11514	SCTP_BUF_LEN(chk->data) = chk->send_size;
11515	chk->sent = SCTP_DATAGRAM_UNSENT;
11516	chk->snd_count = 0;
11517	chk->whoTo = net;
11518	atomic_add_int(&chk->whoTo->ref_count, 1);
11519	cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11520	cwr->ch.chunk_type = SCTP_ECN_CWR;
11521	cwr->ch.chunk_flags = override;
11522	cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
11523	cwr->tsn = htonl(high_tsn);
11524	TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11525	asoc->ctrl_queue_cnt++;
11526}
11527
11528void
11529sctp_add_stream_reset_out(struct sctp_tmit_chunk *chk,
11530    int number_entries, uint16_t * list,
11531    uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
11532{
11533	uint16_t len, old_len, i;
11534	struct sctp_stream_reset_out_request *req_out;
11535	struct sctp_chunkhdr *ch;
11536
11537	ch = mtod(chk->data, struct sctp_chunkhdr *);
11538	old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11539
11540	/* get to new offset for the param. */
11541	req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
11542	/* now how long will this param be? */
11543	len = (sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
11544	req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
11545	req_out->ph.param_length = htons(len);
11546	req_out->request_seq = htonl(seq);
11547	req_out->response_seq = htonl(resp_seq);
11548	req_out->send_reset_at_tsn = htonl(last_sent);
11549	if (number_entries) {
11550		for (i = 0; i < number_entries; i++) {
11551			req_out->list_of_streams[i] = htons(list[i]);
11552		}
11553	}
11554	if (SCTP_SIZE32(len) > len) {
11555		/*-
11556		 * Need to worry about the pad we may end up adding to the
11557		 * end. This is easy since the struct is either aligned to 4
11558		 * bytes or 2 bytes off.
11559		 */
11560		req_out->list_of_streams[number_entries] = 0;
11561	}
11562	/* now fix the chunk length */
11563	ch->chunk_length = htons(len + old_len);
11564	chk->book_size = len + old_len;
11565	chk->book_size_scale = 0;
11566	chk->send_size = SCTP_SIZE32(chk->book_size);
11567	SCTP_BUF_LEN(chk->data) = chk->send_size;
11568	return;
11569}
11570
11571static void
11572sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
11573    int number_entries, uint16_t * list,
11574    uint32_t seq)
11575{
11576	uint16_t len, old_len, i;
11577	struct sctp_stream_reset_in_request *req_in;
11578	struct sctp_chunkhdr *ch;
11579
11580	ch = mtod(chk->data, struct sctp_chunkhdr *);
11581	old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11582
11583	/* get to new offset for the param. */
11584	req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
11585	/* now how long will this param be? */
11586	len = (sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
11587	req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
11588	req_in->ph.param_length = htons(len);
11589	req_in->request_seq = htonl(seq);
11590	if (number_entries) {
11591		for (i = 0; i < number_entries; i++) {
11592			req_in->list_of_streams[i] = htons(list[i]);
11593		}
11594	}
11595	if (SCTP_SIZE32(len) > len) {
11596		/*-
11597		 * Need to worry about the pad we may end up adding to the
11598		 * end. This is easy since the struct is either aligned to 4
11599		 * bytes or 2 bytes off.
11600		 */
11601		req_in->list_of_streams[number_entries] = 0;
11602	}
11603	/* now fix the chunk length */
11604	ch->chunk_length = htons(len + old_len);
11605	chk->book_size = len + old_len;
11606	chk->book_size_scale = 0;
11607	chk->send_size = SCTP_SIZE32(chk->book_size);
11608	SCTP_BUF_LEN(chk->data) = chk->send_size;
11609	return;
11610}
11611
11612static void
11613sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
11614    uint32_t seq)
11615{
11616	uint16_t len, old_len;
11617	struct sctp_stream_reset_tsn_request *req_tsn;
11618	struct sctp_chunkhdr *ch;
11619
11620	ch = mtod(chk->data, struct sctp_chunkhdr *);
11621	old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11622
11623	/* get to new offset for the param. */
11624	req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
11625	/* now how long will this param be? */
11626	len = sizeof(struct sctp_stream_reset_tsn_request);
11627	req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
11628	req_tsn->ph.param_length = htons(len);
11629	req_tsn->request_seq = htonl(seq);
11630
11631	/* now fix the chunk length */
11632	ch->chunk_length = htons(len + old_len);
11633	chk->send_size = len + old_len;
11634	chk->book_size = SCTP_SIZE32(chk->send_size);
11635	chk->book_size_scale = 0;
11636	SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11637	return;
11638}
11639
11640void
11641sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
11642    uint32_t resp_seq, uint32_t result)
11643{
11644	uint16_t len, old_len;
11645	struct sctp_stream_reset_response *resp;
11646	struct sctp_chunkhdr *ch;
11647
11648	ch = mtod(chk->data, struct sctp_chunkhdr *);
11649	old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11650
11651	/* get to new offset for the param. */
11652	resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11653	/* now how long will this param be? */
11654	len = sizeof(struct sctp_stream_reset_response);
11655	resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11656	resp->ph.param_length = htons(len);
11657	resp->response_seq = htonl(resp_seq);
11658	resp->result = ntohl(result);
11659
11660	/* now fix the chunk length */
11661	ch->chunk_length = htons(len + old_len);
11662	chk->book_size = len + old_len;
11663	chk->book_size_scale = 0;
11664	chk->send_size = SCTP_SIZE32(chk->book_size);
11665	SCTP_BUF_LEN(chk->data) = chk->send_size;
11666	return;
11667}
11668
11669void
11670sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11671    uint32_t resp_seq, uint32_t result,
11672    uint32_t send_una, uint32_t recv_next)
11673{
11674	uint16_t len, old_len;
11675	struct sctp_stream_reset_response_tsn *resp;
11676	struct sctp_chunkhdr *ch;
11677
11678	ch = mtod(chk->data, struct sctp_chunkhdr *);
11679	old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11680
11681	/* get to new offset for the param. */
11682	resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11683	/* now how long will this param be? */
11684	len = sizeof(struct sctp_stream_reset_response_tsn);
11685	resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11686	resp->ph.param_length = htons(len);
11687	resp->response_seq = htonl(resp_seq);
11688	resp->result = htonl(result);
11689	resp->senders_next_tsn = htonl(send_una);
11690	resp->receivers_next_tsn = htonl(recv_next);
11691
11692	/* now fix the chunk length */
11693	ch->chunk_length = htons(len + old_len);
11694	chk->book_size = len + old_len;
11695	chk->send_size = SCTP_SIZE32(chk->book_size);
11696	chk->book_size_scale = 0;
11697	SCTP_BUF_LEN(chk->data) = chk->send_size;
11698	return;
11699}
11700
11701static void
11702sctp_add_an_out_stream(struct sctp_tmit_chunk *chk,
11703    uint32_t seq,
11704    uint16_t adding)
11705{
11706	uint16_t len, old_len;
11707	struct sctp_chunkhdr *ch;
11708	struct sctp_stream_reset_add_strm *addstr;
11709
11710	ch = mtod(chk->data, struct sctp_chunkhdr *);
11711	old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11712
11713	/* get to new offset for the param. */
11714	addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11715	/* now how long will this param be? */
11716	len = sizeof(struct sctp_stream_reset_add_strm);
11717
11718	/* Fill it out. */
11719	addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_OUT_STREAMS);
11720	addstr->ph.param_length = htons(len);
11721	addstr->request_seq = htonl(seq);
11722	addstr->number_of_streams = htons(adding);
11723	addstr->reserved = 0;
11724
11725	/* now fix the chunk length */
11726	ch->chunk_length = htons(len + old_len);
11727	chk->send_size = len + old_len;
11728	chk->book_size = SCTP_SIZE32(chk->send_size);
11729	chk->book_size_scale = 0;
11730	SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11731	return;
11732}
11733
11734static void
11735sctp_add_an_in_stream(struct sctp_tmit_chunk *chk,
11736    uint32_t seq,
11737    uint16_t adding)
11738{
11739	uint16_t len, old_len;
11740	struct sctp_chunkhdr *ch;
11741	struct sctp_stream_reset_add_strm *addstr;
11742
11743	ch = mtod(chk->data, struct sctp_chunkhdr *);
11744	old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11745
11746	/* get to new offset for the param. */
11747	addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11748	/* now how long will this param be? */
11749	len = sizeof(struct sctp_stream_reset_add_strm);
11750	/* Fill it out. */
11751	addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_IN_STREAMS);
11752	addstr->ph.param_length = htons(len);
11753	addstr->request_seq = htonl(seq);
11754	addstr->number_of_streams = htons(adding);
11755	addstr->reserved = 0;
11756
11757	/* now fix the chunk length */
11758	ch->chunk_length = htons(len + old_len);
11759	chk->send_size = len + old_len;
11760	chk->book_size = SCTP_SIZE32(chk->send_size);
11761	chk->book_size_scale = 0;
11762	SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11763	return;
11764}
11765
11766int
11767sctp_send_str_reset_req(struct sctp_tcb *stcb,
11768    uint16_t number_entries, uint16_t * list,
11769    uint8_t send_out_req,
11770    uint8_t send_in_req,
11771    uint8_t send_tsn_req,
11772    uint8_t add_stream,
11773    uint16_t adding_o,
11774    uint16_t adding_i, uint8_t peer_asked)
11775{
11776
11777	struct sctp_association *asoc;
11778	struct sctp_tmit_chunk *chk;
11779	struct sctp_chunkhdr *ch;
11780	uint32_t seq;
11781
11782	asoc = &stcb->asoc;
11783	if (asoc->stream_reset_outstanding) {
11784		/*-
11785		 * Already one pending, must get ACK back to clear the flag.
11786		 */
11787		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
11788		return (EBUSY);
11789	}
11790	if ((send_out_req == 0) && (send_in_req == 0) && (send_tsn_req == 0) &&
11791	    (add_stream == 0)) {
11792		/* nothing to do */
11793		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11794		return (EINVAL);
11795	}
11796	if (send_tsn_req && (send_out_req || send_in_req)) {
11797		/* error, can't do that */
11798		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11799		return (EINVAL);
11800	}
11801	if (number_entries > (MCLBYTES -
11802	    SCTP_MIN_OVERHEAD -
11803	    sizeof(struct sctp_chunkhdr) -
11804	    sizeof(struct sctp_stream_reset_out_request)) /
11805	    sizeof(uint16_t)) {
11806		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11807		return (ENOMEM);
11808	}
11809	sctp_alloc_a_chunk(stcb, chk);
11810	if (chk == NULL) {
11811		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11812		return (ENOMEM);
11813	}
11814	chk->copy_by_ref = 0;
11815	chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11816	chk->rec.chunk_id.can_take_data = 0;
11817	chk->flags = 0;
11818	chk->asoc = &stcb->asoc;
11819	chk->book_size = sizeof(struct sctp_chunkhdr);
11820	chk->send_size = SCTP_SIZE32(chk->book_size);
11821	chk->book_size_scale = 0;
11822
11823	chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11824	if (chk->data == NULL) {
11825		sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
11826		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11827		return (ENOMEM);
11828	}
11829	SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11830
11831	/* setup chunk parameters */
11832	chk->sent = SCTP_DATAGRAM_UNSENT;
11833	chk->snd_count = 0;
11834	if (stcb->asoc.alternate) {
11835		chk->whoTo = stcb->asoc.alternate;
11836	} else {
11837		chk->whoTo = stcb->asoc.primary_destination;
11838	}
11839	atomic_add_int(&chk->whoTo->ref_count, 1);
11840	ch = mtod(chk->data, struct sctp_chunkhdr *);
11841	ch->chunk_type = SCTP_STREAM_RESET;
11842	ch->chunk_flags = 0;
11843	ch->chunk_length = htons(chk->book_size);
11844	SCTP_BUF_LEN(chk->data) = chk->send_size;
11845
11846	seq = stcb->asoc.str_reset_seq_out;
11847	if (send_out_req) {
11848		sctp_add_stream_reset_out(chk, number_entries, list,
11849		    seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1));
11850		asoc->stream_reset_out_is_outstanding = 1;
11851		seq++;
11852		asoc->stream_reset_outstanding++;
11853	}
11854	if ((add_stream & 1) &&
11855	    ((stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt) < adding_o)) {
11856		/* Need to allocate more */
11857		struct sctp_stream_out *oldstream;
11858		struct sctp_stream_queue_pending *sp, *nsp;
11859		int i;
11860
11861#if defined(SCTP_DETAILED_STR_STATS)
11862		int j;
11863
11864#endif
11865
11866		oldstream = stcb->asoc.strmout;
11867		/* get some more */
11868		SCTP_MALLOC(stcb->asoc.strmout, struct sctp_stream_out *,
11869		    ((stcb->asoc.streamoutcnt + adding_o) * sizeof(struct sctp_stream_out)),
11870		    SCTP_M_STRMO);
11871		if (stcb->asoc.strmout == NULL) {
11872			uint8_t x;
11873
11874			stcb->asoc.strmout = oldstream;
11875			/* Turn off the bit */
11876			x = add_stream & 0xfe;
11877			add_stream = x;
11878			goto skip_stuff;
11879		}
11880		/*
11881		 * Ok now we proceed with copying the old out stuff and
11882		 * initializing the new stuff.
11883		 */
11884		SCTP_TCB_SEND_LOCK(stcb);
11885		stcb->asoc.ss_functions.sctp_ss_clear(stcb, &stcb->asoc, 0, 1);
11886		for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11887			TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
11888			stcb->asoc.strmout[i].chunks_on_queues = oldstream[i].chunks_on_queues;
11889			stcb->asoc.strmout[i].next_sequence_send = oldstream[i].next_sequence_send;
11890			stcb->asoc.strmout[i].last_msg_incomplete = oldstream[i].last_msg_incomplete;
11891			stcb->asoc.strmout[i].stream_no = i;
11892			stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], &oldstream[i]);
11893			/* now anything on those queues? */
11894			TAILQ_FOREACH_SAFE(sp, &oldstream[i].outqueue, next, nsp) {
11895				TAILQ_REMOVE(&oldstream[i].outqueue, sp, next);
11896				TAILQ_INSERT_TAIL(&stcb->asoc.strmout[i].outqueue, sp, next);
11897			}
11898			/* Now move assoc pointers too */
11899			if (stcb->asoc.last_out_stream == &oldstream[i]) {
11900				stcb->asoc.last_out_stream = &stcb->asoc.strmout[i];
11901			}
11902			if (stcb->asoc.locked_on_sending == &oldstream[i]) {
11903				stcb->asoc.locked_on_sending = &stcb->asoc.strmout[i];
11904			}
11905		}
11906		/* now the new streams */
11907		stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 1);
11908		for (i = stcb->asoc.streamoutcnt; i < (stcb->asoc.streamoutcnt + adding_o); i++) {
11909			TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
11910			stcb->asoc.strmout[i].chunks_on_queues = 0;
11911#if defined(SCTP_DETAILED_STR_STATS)
11912			for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
11913				stcb->asoc.strmout[i].abandoned_sent[j] = 0;
11914				stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
11915			}
11916#else
11917			stcb->asoc.strmout[i].abandoned_sent[0] = 0;
11918			stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
11919#endif
11920			stcb->asoc.strmout[i].next_sequence_send = 0x0;
11921			stcb->asoc.strmout[i].stream_no = i;
11922			stcb->asoc.strmout[i].last_msg_incomplete = 0;
11923			stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], NULL);
11924		}
11925		stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt + adding_o;
11926		SCTP_FREE(oldstream, SCTP_M_STRMO);
11927		SCTP_TCB_SEND_UNLOCK(stcb);
11928	}
11929skip_stuff:
11930	if ((add_stream & 1) && (adding_o > 0)) {
11931		asoc->strm_pending_add_size = adding_o;
11932		asoc->peer_req_out = peer_asked;
11933		sctp_add_an_out_stream(chk, seq, adding_o);
11934		seq++;
11935		asoc->stream_reset_outstanding++;
11936	}
11937	if ((add_stream & 2) && (adding_i > 0)) {
11938		sctp_add_an_in_stream(chk, seq, adding_i);
11939		seq++;
11940		asoc->stream_reset_outstanding++;
11941	}
11942	if (send_in_req) {
11943		sctp_add_stream_reset_in(chk, number_entries, list, seq);
11944		seq++;
11945		asoc->stream_reset_outstanding++;
11946	}
11947	if (send_tsn_req) {
11948		sctp_add_stream_reset_tsn(chk, seq);
11949		asoc->stream_reset_outstanding++;
11950	}
11951	asoc->str_reset = chk;
11952	/* insert the chunk for sending */
11953	TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11954	    chk,
11955	    sctp_next);
11956	asoc->ctrl_queue_cnt++;
11957	sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
11958	return (0);
11959}
11960
11961void
11962sctp_send_abort(struct mbuf *m, int iphlen, struct sockaddr *src, struct sockaddr *dst,
11963    struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
11964    uint8_t mflowtype, uint32_t mflowid,
11965    uint32_t vrf_id, uint16_t port)
11966{
11967	/* Don't respond to an ABORT with an ABORT. */
11968	if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
11969		if (cause)
11970			sctp_m_freem(cause);
11971		return;
11972	}
11973	sctp_send_resp_msg(src, dst, sh, vtag, SCTP_ABORT_ASSOCIATION, cause,
11974	    mflowtype, mflowid,
11975	    vrf_id, port);
11976	return;
11977}
11978
11979void
11980sctp_send_operr_to(struct sockaddr *src, struct sockaddr *dst,
11981    struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
11982    uint8_t mflowtype, uint32_t mflowid,
11983    uint32_t vrf_id, uint16_t port)
11984{
11985	sctp_send_resp_msg(src, dst, sh, vtag, SCTP_OPERATION_ERROR, cause,
11986	    mflowtype, mflowid,
11987	    vrf_id, port);
11988	return;
11989}
11990
11991static struct mbuf *
11992sctp_copy_resume(struct uio *uio,
11993    int max_send_len,
11994    int user_marks_eor,
11995    int *error,
11996    uint32_t * sndout,
11997    struct mbuf **new_tail)
11998{
11999	struct mbuf *m;
12000
12001	m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
12002	    (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
12003	if (m == NULL) {
12004		SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12005		*error = ENOBUFS;
12006	} else {
12007		*sndout = m_length(m, NULL);
12008		*new_tail = m_last(m);
12009	}
12010	return (m);
12011}
12012
12013static int
12014sctp_copy_one(struct sctp_stream_queue_pending *sp,
12015    struct uio *uio,
12016    int resv_upfront)
12017{
12018	sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
12019	    resv_upfront, 0);
12020	if (sp->data == NULL) {
12021		SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12022		return (ENOBUFS);
12023	}
12024	sp->tail_mbuf = m_last(sp->data);
12025	return (0);
12026}
12027
12028
12029
12030static struct sctp_stream_queue_pending *
12031sctp_copy_it_in(struct sctp_tcb *stcb,
12032    struct sctp_association *asoc,
12033    struct sctp_sndrcvinfo *srcv,
12034    struct uio *uio,
12035    struct sctp_nets *net,
12036    int max_send_len,
12037    int user_marks_eor,
12038    int *error)
12039{
12040	/*-
12041	 * This routine must be very careful in its work. Protocol
12042	 * processing is up and running so care must be taken to spl...()
12043	 * when you need to do something that may effect the stcb/asoc. The
12044	 * sb is locked however. When data is copied the protocol processing
12045	 * should be enabled since this is a slower operation...
12046	 */
12047	struct sctp_stream_queue_pending *sp = NULL;
12048	int resv_in_first;
12049
12050	*error = 0;
12051	/* Now can we send this? */
12052	if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12053	    (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12054	    (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12055	    (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12056		/* got data while shutting down */
12057		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12058		*error = ECONNRESET;
12059		goto out_now;
12060	}
12061	sctp_alloc_a_strmoq(stcb, sp);
12062	if (sp == NULL) {
12063		SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12064		*error = ENOMEM;
12065		goto out_now;
12066	}
12067	sp->act_flags = 0;
12068	sp->sender_all_done = 0;
12069	sp->sinfo_flags = srcv->sinfo_flags;
12070	sp->timetolive = srcv->sinfo_timetolive;
12071	sp->ppid = srcv->sinfo_ppid;
12072	sp->context = srcv->sinfo_context;
12073	(void)SCTP_GETTIME_TIMEVAL(&sp->ts);
12074
12075	sp->stream = srcv->sinfo_stream;
12076	sp->length = min(uio->uio_resid, max_send_len);
12077	if ((sp->length == (uint32_t) uio->uio_resid) &&
12078	    ((user_marks_eor == 0) ||
12079	    (srcv->sinfo_flags & SCTP_EOF) ||
12080	    (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12081		sp->msg_is_complete = 1;
12082	} else {
12083		sp->msg_is_complete = 0;
12084	}
12085	sp->sender_all_done = 0;
12086	sp->some_taken = 0;
12087	sp->put_last_out = 0;
12088	resv_in_first = sizeof(struct sctp_data_chunk);
12089	sp->data = sp->tail_mbuf = NULL;
12090	if (sp->length == 0) {
12091		*error = 0;
12092		goto skip_copy;
12093	}
12094	if (srcv->sinfo_keynumber_valid) {
12095		sp->auth_keyid = srcv->sinfo_keynumber;
12096	} else {
12097		sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
12098	}
12099	if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
12100		sctp_auth_key_acquire(stcb, sp->auth_keyid);
12101		sp->holds_key_ref = 1;
12102	}
12103	*error = sctp_copy_one(sp, uio, resv_in_first);
12104skip_copy:
12105	if (*error) {
12106		sctp_free_a_strmoq(stcb, sp, SCTP_SO_LOCKED);
12107		sp = NULL;
12108	} else {
12109		if (sp->sinfo_flags & SCTP_ADDR_OVER) {
12110			sp->net = net;
12111			atomic_add_int(&sp->net->ref_count, 1);
12112		} else {
12113			sp->net = NULL;
12114		}
12115		sctp_set_prsctp_policy(sp);
12116	}
12117out_now:
12118	return (sp);
12119}
12120
12121
12122int
12123sctp_sosend(struct socket *so,
12124    struct sockaddr *addr,
12125    struct uio *uio,
12126    struct mbuf *top,
12127    struct mbuf *control,
12128    int flags,
12129    struct thread *p
12130)
12131{
12132	int error, use_sndinfo = 0;
12133	struct sctp_sndrcvinfo sndrcvninfo;
12134	struct sockaddr *addr_to_use;
12135
12136#if defined(INET) && defined(INET6)
12137	struct sockaddr_in sin;
12138
12139#endif
12140
12141	if (control) {
12142		/* process cmsg snd/rcv info (maybe a assoc-id) */
12143		if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&sndrcvninfo, control,
12144		    sizeof(sndrcvninfo))) {
12145			/* got one */
12146			use_sndinfo = 1;
12147		}
12148	}
12149	addr_to_use = addr;
12150#if defined(INET) && defined(INET6)
12151	if ((addr) && (addr->sa_family == AF_INET6)) {
12152		struct sockaddr_in6 *sin6;
12153
12154		sin6 = (struct sockaddr_in6 *)addr;
12155		if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
12156			in6_sin6_2_sin(&sin, sin6);
12157			addr_to_use = (struct sockaddr *)&sin;
12158		}
12159	}
12160#endif
12161	error = sctp_lower_sosend(so, addr_to_use, uio, top,
12162	    control,
12163	    flags,
12164	    use_sndinfo ? &sndrcvninfo : NULL
12165	    ,p
12166	    );
12167	return (error);
12168}
12169
12170
12171int
12172sctp_lower_sosend(struct socket *so,
12173    struct sockaddr *addr,
12174    struct uio *uio,
12175    struct mbuf *i_pak,
12176    struct mbuf *control,
12177    int flags,
12178    struct sctp_sndrcvinfo *srcv
12179    ,
12180    struct thread *p
12181)
12182{
12183	unsigned int sndlen = 0, max_len;
12184	int error, len;
12185	struct mbuf *top = NULL;
12186	int queue_only = 0, queue_only_for_init = 0;
12187	int free_cnt_applied = 0;
12188	int un_sent;
12189	int now_filled = 0;
12190	unsigned int inqueue_bytes = 0;
12191	struct sctp_block_entry be;
12192	struct sctp_inpcb *inp;
12193	struct sctp_tcb *stcb = NULL;
12194	struct timeval now;
12195	struct sctp_nets *net;
12196	struct sctp_association *asoc;
12197	struct sctp_inpcb *t_inp;
12198	int user_marks_eor;
12199	int create_lock_applied = 0;
12200	int nagle_applies = 0;
12201	int some_on_control = 0;
12202	int got_all_of_the_send = 0;
12203	int hold_tcblock = 0;
12204	int non_blocking = 0;
12205	uint32_t local_add_more, local_soresv = 0;
12206	uint16_t port;
12207	uint16_t sinfo_flags;
12208	sctp_assoc_t sinfo_assoc_id;
12209
12210	error = 0;
12211	net = NULL;
12212	stcb = NULL;
12213	asoc = NULL;
12214
12215	t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
12216	if (inp == NULL) {
12217		SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12218		error = EINVAL;
12219		if (i_pak) {
12220			SCTP_RELEASE_PKT(i_pak);
12221		}
12222		return (error);
12223	}
12224	if ((uio == NULL) && (i_pak == NULL)) {
12225		SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12226		return (EINVAL);
12227	}
12228	user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
12229	atomic_add_int(&inp->total_sends, 1);
12230	if (uio) {
12231		if (uio->uio_resid < 0) {
12232			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12233			return (EINVAL);
12234		}
12235		sndlen = uio->uio_resid;
12236	} else {
12237		top = SCTP_HEADER_TO_CHAIN(i_pak);
12238		sndlen = SCTP_HEADER_LEN(i_pak);
12239	}
12240	SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %d\n",
12241	    (void *)addr,
12242	    sndlen);
12243	if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
12244	    (inp->sctp_socket->so_qlimit)) {
12245		/* The listener can NOT send */
12246		SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12247		error = ENOTCONN;
12248		goto out_unlocked;
12249	}
12250	/**
12251	 * Pre-screen address, if one is given the sin-len
12252	 * must be set correctly!
12253	 */
12254	if (addr) {
12255		union sctp_sockstore *raddr = (union sctp_sockstore *)addr;
12256
12257		switch (raddr->sa.sa_family) {
12258#ifdef INET
12259		case AF_INET:
12260			if (raddr->sin.sin_len != sizeof(struct sockaddr_in)) {
12261				SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12262				error = EINVAL;
12263				goto out_unlocked;
12264			}
12265			port = raddr->sin.sin_port;
12266			break;
12267#endif
12268#ifdef INET6
12269		case AF_INET6:
12270			if (raddr->sin6.sin6_len != sizeof(struct sockaddr_in6)) {
12271				SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12272				error = EINVAL;
12273				goto out_unlocked;
12274			}
12275			port = raddr->sin6.sin6_port;
12276			break;
12277#endif
12278		default:
12279			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAFNOSUPPORT);
12280			error = EAFNOSUPPORT;
12281			goto out_unlocked;
12282		}
12283	} else
12284		port = 0;
12285
12286	if (srcv) {
12287		sinfo_flags = srcv->sinfo_flags;
12288		sinfo_assoc_id = srcv->sinfo_assoc_id;
12289		if (INVALID_SINFO_FLAG(sinfo_flags) ||
12290		    PR_SCTP_INVALID_POLICY(sinfo_flags)) {
12291			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12292			error = EINVAL;
12293			goto out_unlocked;
12294		}
12295		if (srcv->sinfo_flags)
12296			SCTP_STAT_INCR(sctps_sends_with_flags);
12297	} else {
12298		sinfo_flags = inp->def_send.sinfo_flags;
12299		sinfo_assoc_id = inp->def_send.sinfo_assoc_id;
12300	}
12301	if (sinfo_flags & SCTP_SENDALL) {
12302		/* its a sendall */
12303		error = sctp_sendall(inp, uio, top, srcv);
12304		top = NULL;
12305		goto out_unlocked;
12306	}
12307	if ((sinfo_flags & SCTP_ADDR_OVER) && (addr == NULL)) {
12308		SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12309		error = EINVAL;
12310		goto out_unlocked;
12311	}
12312	/* now we must find the assoc */
12313	if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12314	    (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12315		SCTP_INP_RLOCK(inp);
12316		stcb = LIST_FIRST(&inp->sctp_asoc_list);
12317		if (stcb) {
12318			SCTP_TCB_LOCK(stcb);
12319			hold_tcblock = 1;
12320		}
12321		SCTP_INP_RUNLOCK(inp);
12322	} else if (sinfo_assoc_id) {
12323		stcb = sctp_findassociation_ep_asocid(inp, sinfo_assoc_id, 0);
12324	} else if (addr) {
12325		/*-
12326		 * Since we did not use findep we must
12327		 * increment it, and if we don't find a tcb
12328		 * decrement it.
12329		 */
12330		SCTP_INP_WLOCK(inp);
12331		SCTP_INP_INCR_REF(inp);
12332		SCTP_INP_WUNLOCK(inp);
12333		stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12334		if (stcb == NULL) {
12335			SCTP_INP_WLOCK(inp);
12336			SCTP_INP_DECR_REF(inp);
12337			SCTP_INP_WUNLOCK(inp);
12338		} else {
12339			hold_tcblock = 1;
12340		}
12341	}
12342	if ((stcb == NULL) && (addr)) {
12343		/* Possible implicit send? */
12344		SCTP_ASOC_CREATE_LOCK(inp);
12345		create_lock_applied = 1;
12346		if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12347		    (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12348			/* Should I really unlock ? */
12349			SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12350			error = EINVAL;
12351			goto out_unlocked;
12352
12353		}
12354		if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12355		    (addr->sa_family == AF_INET6)) {
12356			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12357			error = EINVAL;
12358			goto out_unlocked;
12359		}
12360		SCTP_INP_WLOCK(inp);
12361		SCTP_INP_INCR_REF(inp);
12362		SCTP_INP_WUNLOCK(inp);
12363		/* With the lock applied look again */
12364		stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12365		if ((stcb == NULL) && (control != NULL) && (port > 0)) {
12366			stcb = sctp_findassociation_cmsgs(&t_inp, port, control, &net, &error);
12367		}
12368		if (stcb == NULL) {
12369			SCTP_INP_WLOCK(inp);
12370			SCTP_INP_DECR_REF(inp);
12371			SCTP_INP_WUNLOCK(inp);
12372		} else {
12373			hold_tcblock = 1;
12374		}
12375		if (error) {
12376			goto out_unlocked;
12377		}
12378		if (t_inp != inp) {
12379			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12380			error = ENOTCONN;
12381			goto out_unlocked;
12382		}
12383	}
12384	if (stcb == NULL) {
12385		if (addr == NULL) {
12386			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12387			error = ENOENT;
12388			goto out_unlocked;
12389		} else {
12390			/* We must go ahead and start the INIT process */
12391			uint32_t vrf_id;
12392
12393			if ((sinfo_flags & SCTP_ABORT) ||
12394			    ((sinfo_flags & SCTP_EOF) && (sndlen == 0))) {
12395				/*-
12396				 * User asks to abort a non-existant assoc,
12397				 * or EOF a non-existant assoc with no data
12398				 */
12399				SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12400				error = ENOENT;
12401				goto out_unlocked;
12402			}
12403			/* get an asoc/stcb struct */
12404			vrf_id = inp->def_vrf_id;
12405#ifdef INVARIANTS
12406			if (create_lock_applied == 0) {
12407				panic("Error, should hold create lock and I don't?");
12408			}
12409#endif
12410			stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
12411			    p
12412			    );
12413			if (stcb == NULL) {
12414				/* Error is setup for us in the call */
12415				goto out_unlocked;
12416			}
12417			if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
12418				stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
12419				/*
12420				 * Set the connected flag so we can queue
12421				 * data
12422				 */
12423				soisconnecting(so);
12424			}
12425			hold_tcblock = 1;
12426			if (create_lock_applied) {
12427				SCTP_ASOC_CREATE_UNLOCK(inp);
12428				create_lock_applied = 0;
12429			} else {
12430				SCTP_PRINTF("Huh-3? create lock should have been on??\n");
12431			}
12432			/*
12433			 * Turn on queue only flag to prevent data from
12434			 * being sent
12435			 */
12436			queue_only = 1;
12437			asoc = &stcb->asoc;
12438			SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12439			(void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
12440
12441			/* initialize authentication params for the assoc */
12442			sctp_initialize_auth_params(inp, stcb);
12443
12444			if (control) {
12445				if (sctp_process_cmsgs_for_init(stcb, control, &error)) {
12446					sctp_free_assoc(inp, stcb, SCTP_PCBFREE_FORCE,
12447					    SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
12448					hold_tcblock = 0;
12449					stcb = NULL;
12450					goto out_unlocked;
12451				}
12452			}
12453			/* out with the INIT */
12454			queue_only_for_init = 1;
12455			/*-
12456			 * we may want to dig in after this call and adjust the MTU
12457			 * value. It defaulted to 1500 (constant) but the ro
12458			 * structure may now have an update and thus we may need to
12459			 * change it BEFORE we append the message.
12460			 */
12461		}
12462	} else
12463		asoc = &stcb->asoc;
12464	if (srcv == NULL)
12465		srcv = (struct sctp_sndrcvinfo *)&asoc->def_send;
12466	if (srcv->sinfo_flags & SCTP_ADDR_OVER) {
12467		if (addr)
12468			net = sctp_findnet(stcb, addr);
12469		else
12470			net = NULL;
12471		if ((net == NULL) ||
12472		    ((port != 0) && (port != stcb->rport))) {
12473			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12474			error = EINVAL;
12475			goto out_unlocked;
12476		}
12477	} else {
12478		if (stcb->asoc.alternate) {
12479			net = stcb->asoc.alternate;
12480		} else {
12481			net = stcb->asoc.primary_destination;
12482		}
12483	}
12484	atomic_add_int(&stcb->total_sends, 1);
12485	/* Keep the stcb from being freed under our feet */
12486	atomic_add_int(&asoc->refcnt, 1);
12487	free_cnt_applied = 1;
12488
12489	if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12490		if (sndlen > asoc->smallest_mtu) {
12491			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12492			error = EMSGSIZE;
12493			goto out_unlocked;
12494		}
12495	}
12496	if (SCTP_SO_IS_NBIO(so)
12497	    || (flags & MSG_NBIO)
12498	    ) {
12499		non_blocking = 1;
12500	}
12501	/* would we block? */
12502	if (non_blocking) {
12503		if (hold_tcblock == 0) {
12504			SCTP_TCB_LOCK(stcb);
12505			hold_tcblock = 1;
12506		}
12507		inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12508		if ((SCTP_SB_LIMIT_SND(so) < (sndlen + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
12509		    (stcb->asoc.chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12510			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
12511			if (sndlen > SCTP_SB_LIMIT_SND(so))
12512				error = EMSGSIZE;
12513			else
12514				error = EWOULDBLOCK;
12515			goto out_unlocked;
12516		}
12517		stcb->asoc.sb_send_resv += sndlen;
12518		SCTP_TCB_UNLOCK(stcb);
12519		hold_tcblock = 0;
12520	} else {
12521		atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
12522	}
12523	local_soresv = sndlen;
12524	if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12525		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12526		error = ECONNRESET;
12527		goto out_unlocked;
12528	}
12529	if (create_lock_applied) {
12530		SCTP_ASOC_CREATE_UNLOCK(inp);
12531		create_lock_applied = 0;
12532	}
12533	if (asoc->stream_reset_outstanding) {
12534		/*
12535		 * Can't queue any data while stream reset is underway.
12536		 */
12537		SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAGAIN);
12538		error = EAGAIN;
12539		goto out_unlocked;
12540	}
12541	if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12542	    (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12543		queue_only = 1;
12544	}
12545	/* we are now done with all control */
12546	if (control) {
12547		sctp_m_freem(control);
12548		control = NULL;
12549	}
12550	if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12551	    (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12552	    (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12553	    (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12554		if (srcv->sinfo_flags & SCTP_ABORT) {
12555			;
12556		} else {
12557			SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12558			error = ECONNRESET;
12559			goto out_unlocked;
12560		}
12561	}
12562	/* Ok, we will attempt a msgsnd :> */
12563	if (p) {
12564		p->td_ru.ru_msgsnd++;
12565	}
12566	/* Are we aborting? */
12567	if (srcv->sinfo_flags & SCTP_ABORT) {
12568		struct mbuf *mm;
12569		int tot_demand, tot_out = 0, max_out;
12570
12571		SCTP_STAT_INCR(sctps_sends_with_abort);
12572		if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12573		    (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12574			/* It has to be up before we abort */
12575			/* how big is the user initiated abort? */
12576			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12577			error = EINVAL;
12578			goto out;
12579		}
12580		if (hold_tcblock) {
12581			SCTP_TCB_UNLOCK(stcb);
12582			hold_tcblock = 0;
12583		}
12584		if (top) {
12585			struct mbuf *cntm = NULL;
12586
12587			mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_WAITOK, 1, MT_DATA);
12588			if (sndlen != 0) {
12589				for (cntm = top; cntm; cntm = SCTP_BUF_NEXT(cntm)) {
12590					tot_out += SCTP_BUF_LEN(cntm);
12591				}
12592			}
12593		} else {
12594			/* Must fit in a MTU */
12595			tot_out = sndlen;
12596			tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12597			if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
12598				/* To big */
12599				SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12600				error = EMSGSIZE;
12601				goto out;
12602			}
12603			mm = sctp_get_mbuf_for_msg(tot_demand, 0, M_WAITOK, 1, MT_DATA);
12604		}
12605		if (mm == NULL) {
12606			SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12607			error = ENOMEM;
12608			goto out;
12609		}
12610		max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
12611		max_out -= sizeof(struct sctp_abort_msg);
12612		if (tot_out > max_out) {
12613			tot_out = max_out;
12614		}
12615		if (mm) {
12616			struct sctp_paramhdr *ph;
12617
12618			/* now move forward the data pointer */
12619			ph = mtod(mm, struct sctp_paramhdr *);
12620			ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
12621			ph->param_length = htons(sizeof(struct sctp_paramhdr) + tot_out);
12622			ph++;
12623			SCTP_BUF_LEN(mm) = tot_out + sizeof(struct sctp_paramhdr);
12624			if (top == NULL) {
12625				error = uiomove((caddr_t)ph, (int)tot_out, uio);
12626				if (error) {
12627					/*-
12628					 * Here if we can't get his data we
12629					 * still abort we just don't get to
12630					 * send the users note :-0
12631					 */
12632					sctp_m_freem(mm);
12633					mm = NULL;
12634				}
12635			} else {
12636				if (sndlen != 0) {
12637					SCTP_BUF_NEXT(mm) = top;
12638				}
12639			}
12640		}
12641		if (hold_tcblock == 0) {
12642			SCTP_TCB_LOCK(stcb);
12643		}
12644		atomic_add_int(&stcb->asoc.refcnt, -1);
12645		free_cnt_applied = 0;
12646		/* release this lock, otherwise we hang on ourselves */
12647		sctp_abort_an_association(stcb->sctp_ep, stcb, mm, SCTP_SO_LOCKED);
12648		/* now relock the stcb so everything is sane */
12649		hold_tcblock = 0;
12650		stcb = NULL;
12651		/*
12652		 * In this case top is already chained to mm avoid double
12653		 * free, since we free it below if top != NULL and driver
12654		 * would free it after sending the packet out
12655		 */
12656		if (sndlen != 0) {
12657			top = NULL;
12658		}
12659		goto out_unlocked;
12660	}
12661	/* Calculate the maximum we can send */
12662	inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12663	if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
12664		if (non_blocking) {
12665			/* we already checked for non-blocking above. */
12666			max_len = sndlen;
12667		} else {
12668			max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12669		}
12670	} else {
12671		max_len = 0;
12672	}
12673	if (hold_tcblock) {
12674		SCTP_TCB_UNLOCK(stcb);
12675		hold_tcblock = 0;
12676	}
12677	/* Is the stream no. valid? */
12678	if (srcv->sinfo_stream >= asoc->streamoutcnt) {
12679		/* Invalid stream number */
12680		SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12681		error = EINVAL;
12682		goto out_unlocked;
12683	}
12684	if (asoc->strmout == NULL) {
12685		/* huh? software error */
12686		SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
12687		error = EFAULT;
12688		goto out_unlocked;
12689	}
12690	/* Unless E_EOR mode is on, we must make a send FIT in one call. */
12691	if ((user_marks_eor == 0) &&
12692	    (sndlen > SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
12693		/* It will NEVER fit */
12694		SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12695		error = EMSGSIZE;
12696		goto out_unlocked;
12697	}
12698	if ((uio == NULL) && user_marks_eor) {
12699		/*-
12700		 * We do not support eeor mode for
12701		 * sending with mbuf chains (like sendfile).
12702		 */
12703		SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12704		error = EINVAL;
12705		goto out_unlocked;
12706	}
12707	if (user_marks_eor) {
12708		local_add_more = min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
12709	} else {
12710		/*-
12711		 * For non-eeor the whole message must fit in
12712		 * the socket send buffer.
12713		 */
12714		local_add_more = sndlen;
12715	}
12716	len = 0;
12717	if (non_blocking) {
12718		goto skip_preblock;
12719	}
12720	if (((max_len <= local_add_more) &&
12721	    (SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
12722	    (max_len == 0) ||
12723	    ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12724		/* No room right now ! */
12725		SOCKBUF_LOCK(&so->so_snd);
12726		inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12727		while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
12728		    ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12729			SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %d) || (%d+%d > %d)\n",
12730			    (unsigned int)SCTP_SB_LIMIT_SND(so),
12731			    inqueue_bytes,
12732			    local_add_more,
12733			    stcb->asoc.stream_queue_cnt,
12734			    stcb->asoc.chunks_on_out_queue,
12735			    SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
12736			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12737				sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, asoc, sndlen);
12738			}
12739			be.error = 0;
12740			stcb->block_entry = &be;
12741			error = sbwait(&so->so_snd);
12742			stcb->block_entry = NULL;
12743			if (error || so->so_error || be.error) {
12744				if (error == 0) {
12745					if (so->so_error)
12746						error = so->so_error;
12747					if (be.error) {
12748						error = be.error;
12749					}
12750				}
12751				SOCKBUF_UNLOCK(&so->so_snd);
12752				goto out_unlocked;
12753			}
12754			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12755				sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
12756				    asoc, stcb->asoc.total_output_queue_size);
12757			}
12758			if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12759				goto out_unlocked;
12760			}
12761			inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12762		}
12763		if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
12764			max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12765		} else {
12766			max_len = 0;
12767		}
12768		SOCKBUF_UNLOCK(&so->so_snd);
12769	}
12770skip_preblock:
12771	if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12772		goto out_unlocked;
12773	}
12774	/*
12775	 * sndlen covers for mbuf case uio_resid covers for the non-mbuf
12776	 * case NOTE: uio will be null when top/mbuf is passed
12777	 */
12778	if (sndlen == 0) {
12779		if (srcv->sinfo_flags & SCTP_EOF) {
12780			got_all_of_the_send = 1;
12781			goto dataless_eof;
12782		} else {
12783			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12784			error = EINVAL;
12785			goto out;
12786		}
12787	}
12788	if (top == NULL) {
12789		struct sctp_stream_queue_pending *sp;
12790		struct sctp_stream_out *strm;
12791		uint32_t sndout;
12792
12793		SCTP_TCB_SEND_LOCK(stcb);
12794		if ((asoc->stream_locked) &&
12795		    (asoc->stream_locked_on != srcv->sinfo_stream)) {
12796			SCTP_TCB_SEND_UNLOCK(stcb);
12797			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12798			error = EINVAL;
12799			goto out;
12800		}
12801		SCTP_TCB_SEND_UNLOCK(stcb);
12802
12803		strm = &stcb->asoc.strmout[srcv->sinfo_stream];
12804		if (strm->last_msg_incomplete == 0) {
12805	do_a_copy_in:
12806			sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error);
12807			if ((sp == NULL) || (error)) {
12808				goto out;
12809			}
12810			SCTP_TCB_SEND_LOCK(stcb);
12811			if (sp->msg_is_complete) {
12812				strm->last_msg_incomplete = 0;
12813				asoc->stream_locked = 0;
12814			} else {
12815				/*
12816				 * Just got locked to this guy in case of an
12817				 * interrupt.
12818				 */
12819				strm->last_msg_incomplete = 1;
12820				asoc->stream_locked = 1;
12821				asoc->stream_locked_on = srcv->sinfo_stream;
12822				sp->sender_all_done = 0;
12823			}
12824			sctp_snd_sb_alloc(stcb, sp->length);
12825			atomic_add_int(&asoc->stream_queue_cnt, 1);
12826			if (srcv->sinfo_flags & SCTP_UNORDERED) {
12827				SCTP_STAT_INCR(sctps_sends_with_unord);
12828			}
12829			TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
12830			stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, asoc, strm, sp, 1);
12831			SCTP_TCB_SEND_UNLOCK(stcb);
12832		} else {
12833			SCTP_TCB_SEND_LOCK(stcb);
12834			sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
12835			SCTP_TCB_SEND_UNLOCK(stcb);
12836			if (sp == NULL) {
12837				/* ???? Huh ??? last msg is gone */
12838#ifdef INVARIANTS
12839				panic("Warning: Last msg marked incomplete, yet nothing left?");
12840#else
12841				SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
12842				strm->last_msg_incomplete = 0;
12843#endif
12844				goto do_a_copy_in;
12845
12846			}
12847		}
12848		while (uio->uio_resid > 0) {
12849			/* How much room do we have? */
12850			struct mbuf *new_tail, *mm;
12851
12852			if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
12853				max_len = SCTP_SB_LIMIT_SND(so) - stcb->asoc.total_output_queue_size;
12854			else
12855				max_len = 0;
12856
12857			if ((max_len > SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
12858			    (max_len && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
12859			    (uio->uio_resid && (uio->uio_resid <= (int)max_len))) {
12860				sndout = 0;
12861				new_tail = NULL;
12862				if (hold_tcblock) {
12863					SCTP_TCB_UNLOCK(stcb);
12864					hold_tcblock = 0;
12865				}
12866				mm = sctp_copy_resume(uio, max_len, user_marks_eor, &error, &sndout, &new_tail);
12867				if ((mm == NULL) || error) {
12868					if (mm) {
12869						sctp_m_freem(mm);
12870					}
12871					goto out;
12872				}
12873				/* Update the mbuf and count */
12874				SCTP_TCB_SEND_LOCK(stcb);
12875				if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12876					/*
12877					 * we need to get out. Peer probably
12878					 * aborted.
12879					 */
12880					sctp_m_freem(mm);
12881					if (stcb->asoc.state & SCTP_PCB_FLAGS_WAS_ABORTED) {
12882						SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12883						error = ECONNRESET;
12884					}
12885					SCTP_TCB_SEND_UNLOCK(stcb);
12886					goto out;
12887				}
12888				if (sp->tail_mbuf) {
12889					/* tack it to the end */
12890					SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
12891					sp->tail_mbuf = new_tail;
12892				} else {
12893					/* A stolen mbuf */
12894					sp->data = mm;
12895					sp->tail_mbuf = new_tail;
12896				}
12897				sctp_snd_sb_alloc(stcb, sndout);
12898				atomic_add_int(&sp->length, sndout);
12899				len += sndout;
12900
12901				/* Did we reach EOR? */
12902				if ((uio->uio_resid == 0) &&
12903				    ((user_marks_eor == 0) ||
12904				    (srcv->sinfo_flags & SCTP_EOF) ||
12905				    (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12906					sp->msg_is_complete = 1;
12907				} else {
12908					sp->msg_is_complete = 0;
12909				}
12910				SCTP_TCB_SEND_UNLOCK(stcb);
12911			}
12912			if (uio->uio_resid == 0) {
12913				/* got it all? */
12914				continue;
12915			}
12916			/* PR-SCTP? */
12917			if ((asoc->prsctp_supported) && (asoc->sent_queue_cnt_removeable > 0)) {
12918				/*
12919				 * This is ugly but we must assure locking
12920				 * order
12921				 */
12922				if (hold_tcblock == 0) {
12923					SCTP_TCB_LOCK(stcb);
12924					hold_tcblock = 1;
12925				}
12926				sctp_prune_prsctp(stcb, asoc, srcv, sndlen);
12927				inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12928				if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
12929					max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12930				else
12931					max_len = 0;
12932				if (max_len > 0) {
12933					continue;
12934				}
12935				SCTP_TCB_UNLOCK(stcb);
12936				hold_tcblock = 0;
12937			}
12938			/* wait for space now */
12939			if (non_blocking) {
12940				/* Non-blocking io in place out */
12941				goto skip_out_eof;
12942			}
12943			/* What about the INIT, send it maybe */
12944			if (queue_only_for_init) {
12945				if (hold_tcblock == 0) {
12946					SCTP_TCB_LOCK(stcb);
12947					hold_tcblock = 1;
12948				}
12949				if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
12950					/* a collision took us forward? */
12951					queue_only = 0;
12952				} else {
12953					sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
12954					SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12955					queue_only = 1;
12956				}
12957			}
12958			if ((net->flight_size > net->cwnd) &&
12959			    (asoc->sctp_cmt_on_off == 0)) {
12960				SCTP_STAT_INCR(sctps_send_cwnd_avoid);
12961				queue_only = 1;
12962			} else if (asoc->ifp_had_enobuf) {
12963				SCTP_STAT_INCR(sctps_ifnomemqueued);
12964				if (net->flight_size > (2 * net->mtu)) {
12965					queue_only = 1;
12966				}
12967				asoc->ifp_had_enobuf = 0;
12968			}
12969			un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
12970			    (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
12971			if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
12972			    (stcb->asoc.total_flight > 0) &&
12973			    (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
12974			    (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
12975
12976				/*-
12977				 * Ok, Nagle is set on and we have data outstanding.
12978				 * Don't send anything and let SACKs drive out the
12979				 * data unless wen have a "full" segment to send.
12980				 */
12981				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
12982					sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
12983				}
12984				SCTP_STAT_INCR(sctps_naglequeued);
12985				nagle_applies = 1;
12986			} else {
12987				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
12988					if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
12989						sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
12990				}
12991				SCTP_STAT_INCR(sctps_naglesent);
12992				nagle_applies = 0;
12993			}
12994			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12995
12996				sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
12997				    nagle_applies, un_sent);
12998				sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
12999				    stcb->asoc.total_flight,
13000				    stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13001			}
13002			if (queue_only_for_init)
13003				queue_only_for_init = 0;
13004			if ((queue_only == 0) && (nagle_applies == 0)) {
13005				/*-
13006				 * need to start chunk output
13007				 * before blocking.. note that if
13008				 * a lock is already applied, then
13009				 * the input via the net is happening
13010				 * and I don't need to start output :-D
13011				 */
13012				if (hold_tcblock == 0) {
13013					if (SCTP_TCB_TRYLOCK(stcb)) {
13014						hold_tcblock = 1;
13015						sctp_chunk_output(inp,
13016						    stcb,
13017						    SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13018					}
13019				} else {
13020					sctp_chunk_output(inp,
13021					    stcb,
13022					    SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13023				}
13024				if (hold_tcblock == 1) {
13025					SCTP_TCB_UNLOCK(stcb);
13026					hold_tcblock = 0;
13027				}
13028			}
13029			SOCKBUF_LOCK(&so->so_snd);
13030			/*-
13031			 * This is a bit strange, but I think it will
13032			 * work. The total_output_queue_size is locked and
13033			 * protected by the TCB_LOCK, which we just released.
13034			 * There is a race that can occur between releasing it
13035			 * above, and me getting the socket lock, where sacks
13036			 * come in but we have not put the SB_WAIT on the
13037			 * so_snd buffer to get the wakeup. After the LOCK
13038			 * is applied the sack_processing will also need to
13039			 * LOCK the so->so_snd to do the actual sowwakeup(). So
13040			 * once we have the socket buffer lock if we recheck the
13041			 * size we KNOW we will get to sleep safely with the
13042			 * wakeup flag in place.
13043			 */
13044			if (SCTP_SB_LIMIT_SND(so) <= (stcb->asoc.total_output_queue_size +
13045			    min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
13046				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13047					sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
13048					    asoc, uio->uio_resid);
13049				}
13050				be.error = 0;
13051				stcb->block_entry = &be;
13052				error = sbwait(&so->so_snd);
13053				stcb->block_entry = NULL;
13054
13055				if (error || so->so_error || be.error) {
13056					if (error == 0) {
13057						if (so->so_error)
13058							error = so->so_error;
13059						if (be.error) {
13060							error = be.error;
13061						}
13062					}
13063					SOCKBUF_UNLOCK(&so->so_snd);
13064					goto out_unlocked;
13065				}
13066				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13067					sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13068					    asoc, stcb->asoc.total_output_queue_size);
13069				}
13070			}
13071			SOCKBUF_UNLOCK(&so->so_snd);
13072			if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13073				goto out_unlocked;
13074			}
13075		}
13076		SCTP_TCB_SEND_LOCK(stcb);
13077		if (sp) {
13078			if (sp->msg_is_complete == 0) {
13079				strm->last_msg_incomplete = 1;
13080				asoc->stream_locked = 1;
13081				asoc->stream_locked_on = srcv->sinfo_stream;
13082			} else {
13083				sp->sender_all_done = 1;
13084				strm->last_msg_incomplete = 0;
13085				asoc->stream_locked = 0;
13086			}
13087		} else {
13088			SCTP_PRINTF("Huh no sp TSNH?\n");
13089			strm->last_msg_incomplete = 0;
13090			asoc->stream_locked = 0;
13091		}
13092		SCTP_TCB_SEND_UNLOCK(stcb);
13093		if (uio->uio_resid == 0) {
13094			got_all_of_the_send = 1;
13095		}
13096	} else {
13097		/* We send in a 0, since we do NOT have any locks */
13098		error = sctp_msg_append(stcb, net, top, srcv, 0);
13099		top = NULL;
13100		if (srcv->sinfo_flags & SCTP_EOF) {
13101			/*
13102			 * This should only happen for Panda for the mbuf
13103			 * send case, which does NOT yet support EEOR mode.
13104			 * Thus, we can just set this flag to do the proper
13105			 * EOF handling.
13106			 */
13107			got_all_of_the_send = 1;
13108		}
13109	}
13110	if (error) {
13111		goto out;
13112	}
13113dataless_eof:
13114	/* EOF thing ? */
13115	if ((srcv->sinfo_flags & SCTP_EOF) &&
13116	    (got_all_of_the_send == 1)) {
13117		int cnt;
13118
13119		SCTP_STAT_INCR(sctps_sends_with_eof);
13120		error = 0;
13121		if (hold_tcblock == 0) {
13122			SCTP_TCB_LOCK(stcb);
13123			hold_tcblock = 1;
13124		}
13125		cnt = sctp_is_there_unsent_data(stcb, SCTP_SO_LOCKED);
13126		if (TAILQ_EMPTY(&asoc->send_queue) &&
13127		    TAILQ_EMPTY(&asoc->sent_queue) &&
13128		    (cnt == 0)) {
13129			if (asoc->locked_on_sending) {
13130				goto abort_anyway;
13131			}
13132			/* there is nothing queued to send, so I'm done... */
13133			if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13134			    (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13135			    (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13136				struct sctp_nets *netp;
13137
13138				/* only send SHUTDOWN the first time through */
13139				if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
13140					SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13141				}
13142				SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
13143				SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
13144				sctp_stop_timers_for_shutdown(stcb);
13145				if (stcb->asoc.alternate) {
13146					netp = stcb->asoc.alternate;
13147				} else {
13148					netp = stcb->asoc.primary_destination;
13149				}
13150				sctp_send_shutdown(stcb, netp);
13151				sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13152				    netp);
13153				sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13154				    asoc->primary_destination);
13155			}
13156		} else {
13157			/*-
13158			 * we still got (or just got) data to send, so set
13159			 * SHUTDOWN_PENDING
13160			 */
13161			/*-
13162			 * XXX sockets draft says that SCTP_EOF should be
13163			 * sent with no data.  currently, we will allow user
13164			 * data to be sent first and move to
13165			 * SHUTDOWN-PENDING
13166			 */
13167			if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13168			    (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13169			    (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13170				if (hold_tcblock == 0) {
13171					SCTP_TCB_LOCK(stcb);
13172					hold_tcblock = 1;
13173				}
13174				if (asoc->locked_on_sending) {
13175					/* Locked to send out the data */
13176					struct sctp_stream_queue_pending *sp;
13177
13178					sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
13179					if (sp) {
13180						if ((sp->length == 0) && (sp->msg_is_complete == 0))
13181							asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
13182					}
13183				}
13184				asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
13185				if (TAILQ_EMPTY(&asoc->send_queue) &&
13186				    TAILQ_EMPTY(&asoc->sent_queue) &&
13187				    (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13188			abort_anyway:
13189					if (free_cnt_applied) {
13190						atomic_add_int(&stcb->asoc.refcnt, -1);
13191						free_cnt_applied = 0;
13192					}
13193					sctp_abort_an_association(stcb->sctp_ep, stcb,
13194					    NULL, SCTP_SO_LOCKED);
13195					/*
13196					 * now relock the stcb so everything
13197					 * is sane
13198					 */
13199					hold_tcblock = 0;
13200					stcb = NULL;
13201					goto out;
13202				}
13203				sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13204				    asoc->primary_destination);
13205				sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
13206			}
13207		}
13208	}
13209skip_out_eof:
13210	if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
13211		some_on_control = 1;
13212	}
13213	if (queue_only_for_init) {
13214		if (hold_tcblock == 0) {
13215			SCTP_TCB_LOCK(stcb);
13216			hold_tcblock = 1;
13217		}
13218		if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13219			/* a collision took us forward? */
13220			queue_only = 0;
13221		} else {
13222			sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13223			SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_WAIT);
13224			queue_only = 1;
13225		}
13226	}
13227	if ((net->flight_size > net->cwnd) &&
13228	    (stcb->asoc.sctp_cmt_on_off == 0)) {
13229		SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13230		queue_only = 1;
13231	} else if (asoc->ifp_had_enobuf) {
13232		SCTP_STAT_INCR(sctps_ifnomemqueued);
13233		if (net->flight_size > (2 * net->mtu)) {
13234			queue_only = 1;
13235		}
13236		asoc->ifp_had_enobuf = 0;
13237	}
13238	un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13239	    (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13240	if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13241	    (stcb->asoc.total_flight > 0) &&
13242	    (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13243	    (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13244		/*-
13245		 * Ok, Nagle is set on and we have data outstanding.
13246		 * Don't send anything and let SACKs drive out the
13247		 * data unless wen have a "full" segment to send.
13248		 */
13249		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13250			sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13251		}
13252		SCTP_STAT_INCR(sctps_naglequeued);
13253		nagle_applies = 1;
13254	} else {
13255		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13256			if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13257				sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13258		}
13259		SCTP_STAT_INCR(sctps_naglesent);
13260		nagle_applies = 0;
13261	}
13262	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13263		sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13264		    nagle_applies, un_sent);
13265		sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13266		    stcb->asoc.total_flight,
13267		    stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13268	}
13269	if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
13270		/* we can attempt to send too. */
13271		if (hold_tcblock == 0) {
13272			/*
13273			 * If there is activity recv'ing sacks no need to
13274			 * send
13275			 */
13276			if (SCTP_TCB_TRYLOCK(stcb)) {
13277				sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13278				hold_tcblock = 1;
13279			}
13280		} else {
13281			sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13282		}
13283	} else if ((queue_only == 0) &&
13284		    (stcb->asoc.peers_rwnd == 0) &&
13285	    (stcb->asoc.total_flight == 0)) {
13286		/* We get to have a probe outstanding */
13287		if (hold_tcblock == 0) {
13288			hold_tcblock = 1;
13289			SCTP_TCB_LOCK(stcb);
13290		}
13291		sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13292	} else if (some_on_control) {
13293		int num_out, reason, frag_point;
13294
13295		/* Here we do control only */
13296		if (hold_tcblock == 0) {
13297			hold_tcblock = 1;
13298			SCTP_TCB_LOCK(stcb);
13299		}
13300		frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
13301		(void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
13302		    &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
13303	}
13304	SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13305	    queue_only, stcb->asoc.peers_rwnd, un_sent,
13306	    stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
13307	    stcb->asoc.total_output_queue_size, error);
13308
13309out:
13310out_unlocked:
13311
13312	if (local_soresv && stcb) {
13313		atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
13314	}
13315	if (create_lock_applied) {
13316		SCTP_ASOC_CREATE_UNLOCK(inp);
13317	}
13318	if ((stcb) && hold_tcblock) {
13319		SCTP_TCB_UNLOCK(stcb);
13320	}
13321	if (stcb && free_cnt_applied) {
13322		atomic_add_int(&stcb->asoc.refcnt, -1);
13323	}
13324#ifdef INVARIANTS
13325	if (stcb) {
13326		if (mtx_owned(&stcb->tcb_mtx)) {
13327			panic("Leaving with tcb mtx owned?");
13328		}
13329		if (mtx_owned(&stcb->tcb_send_mtx)) {
13330			panic("Leaving with tcb send mtx owned?");
13331		}
13332	}
13333#endif
13334#ifdef INVARIANTS
13335	if (inp) {
13336		sctp_validate_no_locks(inp);
13337	} else {
13338		SCTP_PRINTF("Warning - inp is NULL so cant validate locks\n");
13339	}
13340#endif
13341	if (top) {
13342		sctp_m_freem(top);
13343	}
13344	if (control) {
13345		sctp_m_freem(control);
13346	}
13347	return (error);
13348}
13349
13350
13351/*
13352 * generate an AUTHentication chunk, if required
13353 */
13354struct mbuf *
13355sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13356    struct sctp_auth_chunk **auth_ret, uint32_t * offset,
13357    struct sctp_tcb *stcb, uint8_t chunk)
13358{
13359	struct mbuf *m_auth;
13360	struct sctp_auth_chunk *auth;
13361	int chunk_len;
13362	struct mbuf *cn;
13363
13364	if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13365	    (stcb == NULL))
13366		return (m);
13367
13368	if (stcb->asoc.auth_supported == 0) {
13369		return (m);
13370	}
13371	/* does the requested chunk require auth? */
13372	if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13373		return (m);
13374	}
13375	m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_NOWAIT, 1, MT_HEADER);
13376	if (m_auth == NULL) {
13377		/* no mbuf's */
13378		return (m);
13379	}
13380	/* reserve some space if this will be the first mbuf */
13381	if (m == NULL)
13382		SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13383	/* fill in the AUTH chunk details */
13384	auth = mtod(m_auth, struct sctp_auth_chunk *);
13385	bzero(auth, sizeof(*auth));
13386	auth->ch.chunk_type = SCTP_AUTHENTICATION;
13387	auth->ch.chunk_flags = 0;
13388	chunk_len = sizeof(*auth) +
13389	    sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13390	auth->ch.chunk_length = htons(chunk_len);
13391	auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13392	/* key id and hmac digest will be computed and filled in upon send */
13393
13394	/* save the offset where the auth was inserted into the chain */
13395	*offset = 0;
13396	for (cn = m; cn; cn = SCTP_BUF_NEXT(cn)) {
13397		*offset += SCTP_BUF_LEN(cn);
13398	}
13399
13400	/* update length and return pointer to the auth chunk */
13401	SCTP_BUF_LEN(m_auth) = chunk_len;
13402	m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13403	if (auth_ret != NULL)
13404		*auth_ret = auth;
13405
13406	return (m);
13407}
13408
13409#ifdef INET6
13410int
13411sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t * ro)
13412{
13413	struct nd_prefix *pfx = NULL;
13414	struct nd_pfxrouter *pfxrtr = NULL;
13415	struct sockaddr_in6 gw6;
13416
13417	if (ro == NULL || ro->ro_rt == NULL || src6->sin6_family != AF_INET6)
13418		return (0);
13419
13420	/* get prefix entry of address */
13421	LIST_FOREACH(pfx, &MODULE_GLOBAL(nd_prefix), ndpr_entry) {
13422		if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13423			continue;
13424		if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13425		    &src6->sin6_addr, &pfx->ndpr_mask))
13426			break;
13427	}
13428	/* no prefix entry in the prefix list */
13429	if (pfx == NULL) {
13430		SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13431		SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13432		return (0);
13433	}
13434	SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13435	SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13436
13437	/* search installed gateway from prefix entry */
13438	LIST_FOREACH(pfxrtr, &pfx->ndpr_advrtrs, pfr_entry) {
13439		memset(&gw6, 0, sizeof(struct sockaddr_in6));
13440		gw6.sin6_family = AF_INET6;
13441		gw6.sin6_len = sizeof(struct sockaddr_in6);
13442		memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13443		    sizeof(struct in6_addr));
13444		SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13445		SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13446		SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13447		SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13448		if (sctp_cmpaddr((struct sockaddr *)&gw6,
13449		    ro->ro_rt->rt_gateway)) {
13450			SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13451			return (1);
13452		}
13453	}
13454	SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13455	return (0);
13456}
13457
13458#endif
13459
13460int
13461sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t * ro)
13462{
13463#ifdef INET
13464	struct sockaddr_in *sin, *mask;
13465	struct ifaddr *ifa;
13466	struct in_addr srcnetaddr, gwnetaddr;
13467
13468	if (ro == NULL || ro->ro_rt == NULL ||
13469	    sifa->address.sa.sa_family != AF_INET) {
13470		return (0);
13471	}
13472	ifa = (struct ifaddr *)sifa->ifa;
13473	mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13474	sin = &sifa->address.sin;
13475	srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13476	SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13477	SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13478	SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13479
13480	sin = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
13481	gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13482	SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13483	SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13484	SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13485	if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13486		return (1);
13487	}
13488#endif
13489	return (0);
13490}
13491