sctp_output.c revision 270361 
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 270361 2014-08-22 20:16:26Z 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 = (struct sockaddr_in *)&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 = (struct sockaddr_in6 *)&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 = (struct sockaddr_in *)&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 = (struct sockaddr_in6 *)&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					/* Default is NOT correct */
3622					SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, default:%d pre_open:%d\n",
3623					    stcb->asoc.streamoutcnt, stcb->asoc.pre_open_streams);
3624					SCTP_TCB_UNLOCK(stcb);
3625					SCTP_MALLOC(tmp_str,
3626					    struct sctp_stream_out *,
3627					    (stcb->asoc.pre_open_streams * sizeof(struct sctp_stream_out)),
3628					    SCTP_M_STRMO);
3629					SCTP_TCB_LOCK(stcb);
3630					if (tmp_str != NULL) {
3631						SCTP_FREE(stcb->asoc.strmout, SCTP_M_STRMO);
3632						stcb->asoc.strmout = tmp_str;
3633						stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt = stcb->asoc.pre_open_streams;
3634					} else {
3635						stcb->asoc.pre_open_streams = stcb->asoc.streamoutcnt;
3636					}
3637					for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3638						TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
3639						stcb->asoc.strmout[i].chunks_on_queues = 0;
3640						stcb->asoc.strmout[i].next_sequence_send = 0;
3641						stcb->asoc.strmout[i].stream_no = i;
3642						stcb->asoc.strmout[i].last_msg_incomplete = 0;
3643						stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], NULL);
3644					}
3645				}
3646				break;
3647#ifdef INET
3648			case SCTP_DSTADDRV4:
3649				if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in_addr)) {
3650					*error = EINVAL;
3651					return (1);
3652				}
3653				memset(&sin, 0, sizeof(struct sockaddr_in));
3654				sin.sin_family = AF_INET;
3655				sin.sin_len = sizeof(struct sockaddr_in);
3656				sin.sin_port = stcb->rport;
3657				m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3658				if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3659				    (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3660				    IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3661					*error = EINVAL;
3662					return (1);
3663				}
3664				if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL,
3665				    SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3666					*error = ENOBUFS;
3667					return (1);
3668				}
3669				break;
3670#endif
3671#ifdef INET6
3672			case SCTP_DSTADDRV6:
3673				if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in6_addr)) {
3674					*error = EINVAL;
3675					return (1);
3676				}
3677				memset(&sin6, 0, sizeof(struct sockaddr_in6));
3678				sin6.sin6_family = AF_INET6;
3679				sin6.sin6_len = sizeof(struct sockaddr_in6);
3680				sin6.sin6_port = stcb->rport;
3681				m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3682				if (IN6_IS_ADDR_UNSPECIFIED(&sin6.sin6_addr) ||
3683				    IN6_IS_ADDR_MULTICAST(&sin6.sin6_addr)) {
3684					*error = EINVAL;
3685					return (1);
3686				}
3687#ifdef INET
3688				if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3689					in6_sin6_2_sin(&sin, &sin6);
3690					if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3691					    (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3692					    IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3693						*error = EINVAL;
3694						return (1);
3695					}
3696					if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL,
3697					    SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3698						*error = ENOBUFS;
3699						return (1);
3700					}
3701				} else
3702#endif
3703					if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin6, NULL,
3704				    SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3705					*error = ENOBUFS;
3706					return (1);
3707				}
3708				break;
3709#endif
3710			default:
3711				break;
3712			}
3713		}
3714		at += CMSG_ALIGN(cmh.cmsg_len);
3715	}
3716	return (0);
3717}
3718
3719static struct sctp_tcb *
3720sctp_findassociation_cmsgs(struct sctp_inpcb **inp_p,
3721    uint16_t port,
3722    struct mbuf *control,
3723    struct sctp_nets **net_p,
3724    int *error)
3725{
3726	struct cmsghdr cmh;
3727	int tlen, at;
3728	struct sctp_tcb *stcb;
3729	struct sockaddr *addr;
3730
3731#ifdef INET
3732	struct sockaddr_in sin;
3733
3734#endif
3735#ifdef INET6
3736	struct sockaddr_in6 sin6;
3737
3738#endif
3739
3740	tlen = SCTP_BUF_LEN(control);
3741	at = 0;
3742	while (at < tlen) {
3743		if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3744			/* There is not enough room for one more. */
3745			*error = EINVAL;
3746			return (NULL);
3747		}
3748		m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3749		if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3750			/* We dont't have a complete CMSG header. */
3751			*error = EINVAL;
3752			return (NULL);
3753		}
3754		if (((int)cmh.cmsg_len + at) > tlen) {
3755			/* We don't have the complete CMSG. */
3756			*error = EINVAL;
3757			return (NULL);
3758		}
3759		if (cmh.cmsg_level == IPPROTO_SCTP) {
3760			switch (cmh.cmsg_type) {
3761#ifdef INET
3762			case SCTP_DSTADDRV4:
3763				if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in_addr)) {
3764					*error = EINVAL;
3765					return (NULL);
3766				}
3767				memset(&sin, 0, sizeof(struct sockaddr_in));
3768				sin.sin_family = AF_INET;
3769				sin.sin_len = sizeof(struct sockaddr_in);
3770				sin.sin_port = port;
3771				m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3772				addr = (struct sockaddr *)&sin;
3773				break;
3774#endif
3775#ifdef INET6
3776			case SCTP_DSTADDRV6:
3777				if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in6_addr)) {
3778					*error = EINVAL;
3779					return (NULL);
3780				}
3781				memset(&sin6, 0, sizeof(struct sockaddr_in6));
3782				sin6.sin6_family = AF_INET6;
3783				sin6.sin6_len = sizeof(struct sockaddr_in6);
3784				sin6.sin6_port = port;
3785				m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3786#ifdef INET
3787				if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3788					in6_sin6_2_sin(&sin, &sin6);
3789					addr = (struct sockaddr *)&sin;
3790				} else
3791#endif
3792					addr = (struct sockaddr *)&sin6;
3793				break;
3794#endif
3795			default:
3796				addr = NULL;
3797				break;
3798			}
3799			if (addr) {
3800				stcb = sctp_findassociation_ep_addr(inp_p, addr, net_p, NULL, NULL);
3801				if (stcb != NULL) {
3802					return (stcb);
3803				}
3804			}
3805		}
3806		at += CMSG_ALIGN(cmh.cmsg_len);
3807	}
3808	return (NULL);
3809}
3810
3811static struct mbuf *
3812sctp_add_cookie(struct mbuf *init, int init_offset,
3813    struct mbuf *initack, int initack_offset, struct sctp_state_cookie *stc_in, uint8_t ** signature)
3814{
3815	struct mbuf *copy_init, *copy_initack, *m_at, *sig, *mret;
3816	struct sctp_state_cookie *stc;
3817	struct sctp_paramhdr *ph;
3818	uint8_t *foo;
3819	int sig_offset;
3820	uint16_t cookie_sz;
3821
3822	mret = sctp_get_mbuf_for_msg((sizeof(struct sctp_state_cookie) +
3823	    sizeof(struct sctp_paramhdr)), 0,
3824	    M_NOWAIT, 1, MT_DATA);
3825	if (mret == NULL) {
3826		return (NULL);
3827	}
3828	copy_init = SCTP_M_COPYM(init, init_offset, M_COPYALL, M_NOWAIT);
3829	if (copy_init == NULL) {
3830		sctp_m_freem(mret);
3831		return (NULL);
3832	}
3833#ifdef SCTP_MBUF_LOGGING
3834	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3835		struct mbuf *mat;
3836
3837		for (mat = copy_init; mat; mat = SCTP_BUF_NEXT(mat)) {
3838			if (SCTP_BUF_IS_EXTENDED(mat)) {
3839				sctp_log_mb(mat, SCTP_MBUF_ICOPY);
3840			}
3841		}
3842	}
3843#endif
3844	copy_initack = SCTP_M_COPYM(initack, initack_offset, M_COPYALL,
3845	    M_NOWAIT);
3846	if (copy_initack == NULL) {
3847		sctp_m_freem(mret);
3848		sctp_m_freem(copy_init);
3849		return (NULL);
3850	}
3851#ifdef SCTP_MBUF_LOGGING
3852	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3853		struct mbuf *mat;
3854
3855		for (mat = copy_initack; mat; mat = SCTP_BUF_NEXT(mat)) {
3856			if (SCTP_BUF_IS_EXTENDED(mat)) {
3857				sctp_log_mb(mat, SCTP_MBUF_ICOPY);
3858			}
3859		}
3860	}
3861#endif
3862	/* easy side we just drop it on the end */
3863	ph = mtod(mret, struct sctp_paramhdr *);
3864	SCTP_BUF_LEN(mret) = sizeof(struct sctp_state_cookie) +
3865	    sizeof(struct sctp_paramhdr);
3866	stc = (struct sctp_state_cookie *)((caddr_t)ph +
3867	    sizeof(struct sctp_paramhdr));
3868	ph->param_type = htons(SCTP_STATE_COOKIE);
3869	ph->param_length = 0;	/* fill in at the end */
3870	/* Fill in the stc cookie data */
3871	memcpy(stc, stc_in, sizeof(struct sctp_state_cookie));
3872
3873	/* tack the INIT and then the INIT-ACK onto the chain */
3874	cookie_sz = 0;
3875	for (m_at = mret; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3876		cookie_sz += SCTP_BUF_LEN(m_at);
3877		if (SCTP_BUF_NEXT(m_at) == NULL) {
3878			SCTP_BUF_NEXT(m_at) = copy_init;
3879			break;
3880		}
3881	}
3882	for (m_at = copy_init; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3883		cookie_sz += SCTP_BUF_LEN(m_at);
3884		if (SCTP_BUF_NEXT(m_at) == NULL) {
3885			SCTP_BUF_NEXT(m_at) = copy_initack;
3886			break;
3887		}
3888	}
3889	for (m_at = copy_initack; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3890		cookie_sz += SCTP_BUF_LEN(m_at);
3891		if (SCTP_BUF_NEXT(m_at) == NULL) {
3892			break;
3893		}
3894	}
3895	sig = sctp_get_mbuf_for_msg(SCTP_SECRET_SIZE, 0, M_NOWAIT, 1, MT_DATA);
3896	if (sig == NULL) {
3897		/* no space, so free the entire chain */
3898		sctp_m_freem(mret);
3899		return (NULL);
3900	}
3901	SCTP_BUF_LEN(sig) = 0;
3902	SCTP_BUF_NEXT(m_at) = sig;
3903	sig_offset = 0;
3904	foo = (uint8_t *) (mtod(sig, caddr_t)+sig_offset);
3905	memset(foo, 0, SCTP_SIGNATURE_SIZE);
3906	*signature = foo;
3907	SCTP_BUF_LEN(sig) += SCTP_SIGNATURE_SIZE;
3908	cookie_sz += SCTP_SIGNATURE_SIZE;
3909	ph->param_length = htons(cookie_sz);
3910	return (mret);
3911}
3912
3913
3914static uint8_t
3915sctp_get_ect(struct sctp_tcb *stcb)
3916{
3917	if ((stcb != NULL) && (stcb->asoc.ecn_supported == 1)) {
3918		return (SCTP_ECT0_BIT);
3919	} else {
3920		return (0);
3921	}
3922}
3923
3924#if defined(INET) || defined(INET6)
3925static void
3926sctp_handle_no_route(struct sctp_tcb *stcb,
3927    struct sctp_nets *net,
3928    int so_locked)
3929{
3930	SCTPDBG(SCTP_DEBUG_OUTPUT1, "dropped packet - no valid source addr\n");
3931
3932	if (net) {
3933		SCTPDBG(SCTP_DEBUG_OUTPUT1, "Destination was ");
3934		SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT1, &net->ro._l_addr.sa);
3935		if (net->dest_state & SCTP_ADDR_CONFIRMED) {
3936			if ((net->dest_state & SCTP_ADDR_REACHABLE) && stcb) {
3937				SCTPDBG(SCTP_DEBUG_OUTPUT1, "no route takes interface %p down\n", (void *)net);
3938				sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
3939				    stcb, 0,
3940				    (void *)net,
3941				    so_locked);
3942				net->dest_state &= ~SCTP_ADDR_REACHABLE;
3943				net->dest_state &= ~SCTP_ADDR_PF;
3944			}
3945		}
3946		if (stcb) {
3947			if (net == stcb->asoc.primary_destination) {
3948				/* need a new primary */
3949				struct sctp_nets *alt;
3950
3951				alt = sctp_find_alternate_net(stcb, net, 0);
3952				if (alt != net) {
3953					if (stcb->asoc.alternate) {
3954						sctp_free_remote_addr(stcb->asoc.alternate);
3955					}
3956					stcb->asoc.alternate = alt;
3957					atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
3958					if (net->ro._s_addr) {
3959						sctp_free_ifa(net->ro._s_addr);
3960						net->ro._s_addr = NULL;
3961					}
3962					net->src_addr_selected = 0;
3963				}
3964			}
3965		}
3966	}
3967}
3968
3969#endif
3970
3971static int
3972sctp_lowlevel_chunk_output(struct sctp_inpcb *inp,
3973    struct sctp_tcb *stcb,	/* may be NULL */
3974    struct sctp_nets *net,
3975    struct sockaddr *to,
3976    struct mbuf *m,
3977    uint32_t auth_offset,
3978    struct sctp_auth_chunk *auth,
3979    uint16_t auth_keyid,
3980    int nofragment_flag,
3981    int ecn_ok,
3982    int out_of_asoc_ok,
3983    uint16_t src_port,
3984    uint16_t dest_port,
3985    uint32_t v_tag,
3986    uint16_t port,
3987    union sctp_sockstore *over_addr,
3988    uint8_t use_mflowid, uint32_t mflowid,
3989#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
3990    int so_locked SCTP_UNUSED
3991#else
3992    int so_locked
3993#endif
3994)
3995/* nofragment_flag to tell if IP_DF should be set (IPv4 only) */
3996{
3997	/**
3998	 * Given a mbuf chain (via SCTP_BUF_NEXT()) that holds a packet header
3999	 * WITH an SCTPHDR but no IP header, endpoint inp and sa structure:
4000	 * - fill in the HMAC digest of any AUTH chunk in the packet.
4001	 * - calculate and fill in the SCTP checksum.
4002	 * - prepend an IP address header.
4003	 * - if boundall use INADDR_ANY.
4004	 * - if boundspecific do source address selection.
4005	 * - set fragmentation option for ipV4.
4006	 * - On return from IP output, check/adjust mtu size of output
4007	 *   interface and smallest_mtu size as well.
4008	 */
4009	/* Will need ifdefs around this */
4010	struct mbuf *newm;
4011	struct sctphdr *sctphdr;
4012	int packet_length;
4013	int ret;
4014
4015#if defined(INET) || defined(INET6)
4016	uint32_t vrf_id;
4017
4018#endif
4019#if defined(INET) || defined(INET6)
4020	struct mbuf *o_pak;
4021	sctp_route_t *ro = NULL;
4022	struct udphdr *udp = NULL;
4023
4024#endif
4025	uint8_t tos_value;
4026
4027#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4028	struct socket *so = NULL;
4029
4030#endif
4031
4032	if ((net) && (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)) {
4033		SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4034		sctp_m_freem(m);
4035		return (EFAULT);
4036	}
4037#if defined(INET) || defined(INET6)
4038	if (stcb) {
4039		vrf_id = stcb->asoc.vrf_id;
4040	} else {
4041		vrf_id = inp->def_vrf_id;
4042	}
4043#endif
4044	/* fill in the HMAC digest for any AUTH chunk in the packet */
4045	if ((auth != NULL) && (stcb != NULL)) {
4046		sctp_fill_hmac_digest_m(m, auth_offset, auth, stcb, auth_keyid);
4047	}
4048	if (net) {
4049		tos_value = net->dscp;
4050	} else if (stcb) {
4051		tos_value = stcb->asoc.default_dscp;
4052	} else {
4053		tos_value = inp->sctp_ep.default_dscp;
4054	}
4055
4056	switch (to->sa_family) {
4057#ifdef INET
4058	case AF_INET:
4059		{
4060			struct ip *ip = NULL;
4061			sctp_route_t iproute;
4062			int len;
4063
4064			len = sizeof(struct ip) + sizeof(struct sctphdr);
4065			if (port) {
4066				len += sizeof(struct udphdr);
4067			}
4068			newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4069			if (newm == NULL) {
4070				sctp_m_freem(m);
4071				SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4072				return (ENOMEM);
4073			}
4074			SCTP_ALIGN_TO_END(newm, len);
4075			SCTP_BUF_LEN(newm) = len;
4076			SCTP_BUF_NEXT(newm) = m;
4077			m = newm;
4078			if (net != NULL) {
4079#ifdef INVARIANTS
4080				if (net->flowidset == 0) {
4081					panic("Flow ID not set");
4082				}
4083#endif
4084				m->m_pkthdr.flowid = net->flowid;
4085				m->m_flags |= M_FLOWID;
4086			} else {
4087				if (use_mflowid != 0) {
4088					m->m_pkthdr.flowid = mflowid;
4089					m->m_flags |= M_FLOWID;
4090				}
4091			}
4092			packet_length = sctp_calculate_len(m);
4093			ip = mtod(m, struct ip *);
4094			ip->ip_v = IPVERSION;
4095			ip->ip_hl = (sizeof(struct ip) >> 2);
4096			if (tos_value == 0) {
4097				/*
4098				 * This means especially, that it is not set
4099				 * at the SCTP layer. So use the value from
4100				 * the IP layer.
4101				 */
4102				tos_value = inp->ip_inp.inp.inp_ip_tos;
4103			}
4104			tos_value &= 0xfc;
4105			if (ecn_ok) {
4106				tos_value |= sctp_get_ect(stcb);
4107			}
4108			if ((nofragment_flag) && (port == 0)) {
4109				ip->ip_off = htons(IP_DF);
4110			} else {
4111				ip->ip_off = htons(0);
4112			}
4113			/* FreeBSD has a function for ip_id's */
4114			ip->ip_id = ip_newid();
4115
4116			ip->ip_ttl = inp->ip_inp.inp.inp_ip_ttl;
4117			ip->ip_len = htons(packet_length);
4118			ip->ip_tos = tos_value;
4119			if (port) {
4120				ip->ip_p = IPPROTO_UDP;
4121			} else {
4122				ip->ip_p = IPPROTO_SCTP;
4123			}
4124			ip->ip_sum = 0;
4125			if (net == NULL) {
4126				ro = &iproute;
4127				memset(&iproute, 0, sizeof(iproute));
4128				memcpy(&ro->ro_dst, to, to->sa_len);
4129			} else {
4130				ro = (sctp_route_t *) & net->ro;
4131			}
4132			/* Now the address selection part */
4133			ip->ip_dst.s_addr = ((struct sockaddr_in *)to)->sin_addr.s_addr;
4134
4135			/* call the routine to select the src address */
4136			if (net && out_of_asoc_ok == 0) {
4137				if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4138					sctp_free_ifa(net->ro._s_addr);
4139					net->ro._s_addr = NULL;
4140					net->src_addr_selected = 0;
4141					if (ro->ro_rt) {
4142						RTFREE(ro->ro_rt);
4143						ro->ro_rt = NULL;
4144					}
4145				}
4146				if (net->src_addr_selected == 0) {
4147					/* Cache the source address */
4148					net->ro._s_addr = sctp_source_address_selection(inp, stcb,
4149					    ro, net, 0,
4150					    vrf_id);
4151					net->src_addr_selected = 1;
4152				}
4153				if (net->ro._s_addr == NULL) {
4154					/* No route to host */
4155					net->src_addr_selected = 0;
4156					sctp_handle_no_route(stcb, net, so_locked);
4157					SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4158					sctp_m_freem(m);
4159					return (EHOSTUNREACH);
4160				}
4161				ip->ip_src = net->ro._s_addr->address.sin.sin_addr;
4162			} else {
4163				if (over_addr == NULL) {
4164					struct sctp_ifa *_lsrc;
4165
4166					_lsrc = sctp_source_address_selection(inp, stcb, ro,
4167					    net,
4168					    out_of_asoc_ok,
4169					    vrf_id);
4170					if (_lsrc == NULL) {
4171						sctp_handle_no_route(stcb, net, so_locked);
4172						SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4173						sctp_m_freem(m);
4174						return (EHOSTUNREACH);
4175					}
4176					ip->ip_src = _lsrc->address.sin.sin_addr;
4177					sctp_free_ifa(_lsrc);
4178				} else {
4179					ip->ip_src = over_addr->sin.sin_addr;
4180					SCTP_RTALLOC(ro, vrf_id);
4181				}
4182			}
4183			if (port) {
4184				if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4185					sctp_handle_no_route(stcb, net, so_locked);
4186					SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4187					sctp_m_freem(m);
4188					return (EHOSTUNREACH);
4189				}
4190				udp = (struct udphdr *)((caddr_t)ip + sizeof(struct ip));
4191				udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4192				udp->uh_dport = port;
4193				udp->uh_ulen = htons(packet_length - sizeof(struct ip));
4194				if (V_udp_cksum) {
4195					udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
4196				} else {
4197					udp->uh_sum = 0;
4198				}
4199				sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4200			} else {
4201				sctphdr = (struct sctphdr *)((caddr_t)ip + sizeof(struct ip));
4202			}
4203
4204			sctphdr->src_port = src_port;
4205			sctphdr->dest_port = dest_port;
4206			sctphdr->v_tag = v_tag;
4207			sctphdr->checksum = 0;
4208
4209			/*
4210			 * If source address selection fails and we find no
4211			 * route then the ip_output should fail as well with
4212			 * a NO_ROUTE_TO_HOST type error. We probably should
4213			 * catch that somewhere and abort the association
4214			 * right away (assuming this is an INIT being sent).
4215			 */
4216			if (ro->ro_rt == NULL) {
4217				/*
4218				 * src addr selection failed to find a route
4219				 * (or valid source addr), so we can't get
4220				 * there from here (yet)!
4221				 */
4222				sctp_handle_no_route(stcb, net, so_locked);
4223				SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4224				sctp_m_freem(m);
4225				return (EHOSTUNREACH);
4226			}
4227			if (ro != &iproute) {
4228				memcpy(&iproute, ro, sizeof(*ro));
4229			}
4230			SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv4 output routine from low level src addr:%x\n",
4231			    (uint32_t) (ntohl(ip->ip_src.s_addr)));
4232			SCTPDBG(SCTP_DEBUG_OUTPUT3, "Destination is %x\n",
4233			    (uint32_t) (ntohl(ip->ip_dst.s_addr)));
4234			SCTPDBG(SCTP_DEBUG_OUTPUT3, "RTP route is %p through\n",
4235			    (void *)ro->ro_rt);
4236
4237			if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4238				/* failed to prepend data, give up */
4239				SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4240				sctp_m_freem(m);
4241				return (ENOMEM);
4242			}
4243			SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4244			if (port) {
4245#if defined(SCTP_WITH_NO_CSUM)
4246				SCTP_STAT_INCR(sctps_sendnocrc);
4247#else
4248				sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip) + sizeof(struct udphdr));
4249				SCTP_STAT_INCR(sctps_sendswcrc);
4250#endif
4251				if (V_udp_cksum) {
4252					SCTP_ENABLE_UDP_CSUM(o_pak);
4253				}
4254			} else {
4255#if defined(SCTP_WITH_NO_CSUM)
4256				SCTP_STAT_INCR(sctps_sendnocrc);
4257#else
4258				m->m_pkthdr.csum_flags = CSUM_SCTP;
4259				m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4260				SCTP_STAT_INCR(sctps_sendhwcrc);
4261#endif
4262			}
4263#ifdef SCTP_PACKET_LOGGING
4264			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4265				sctp_packet_log(o_pak);
4266#endif
4267			/* send it out.  table id is taken from stcb */
4268#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4269			if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4270				so = SCTP_INP_SO(inp);
4271				SCTP_SOCKET_UNLOCK(so, 0);
4272			}
4273#endif
4274			SCTP_IP_OUTPUT(ret, o_pak, ro, stcb, vrf_id);
4275#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4276			if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4277				atomic_add_int(&stcb->asoc.refcnt, 1);
4278				SCTP_TCB_UNLOCK(stcb);
4279				SCTP_SOCKET_LOCK(so, 0);
4280				SCTP_TCB_LOCK(stcb);
4281				atomic_subtract_int(&stcb->asoc.refcnt, 1);
4282			}
4283#endif
4284			SCTP_STAT_INCR(sctps_sendpackets);
4285			SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4286			if (ret)
4287				SCTP_STAT_INCR(sctps_senderrors);
4288
4289			SCTPDBG(SCTP_DEBUG_OUTPUT3, "IP output returns %d\n", ret);
4290			if (net == NULL) {
4291				/* free tempy routes */
4292				RO_RTFREE(ro);
4293			} else {
4294				/*
4295				 * PMTU check versus smallest asoc MTU goes
4296				 * here
4297				 */
4298				if ((ro->ro_rt != NULL) &&
4299				    (net->ro._s_addr)) {
4300					uint32_t mtu;
4301
4302					mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4303					if (net->port) {
4304						mtu -= sizeof(struct udphdr);
4305					}
4306					if (mtu && (stcb->asoc.smallest_mtu > mtu)) {
4307						sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4308						net->mtu = mtu;
4309					}
4310				} else if (ro->ro_rt == NULL) {
4311					/* route was freed */
4312					if (net->ro._s_addr &&
4313					    net->src_addr_selected) {
4314						sctp_free_ifa(net->ro._s_addr);
4315						net->ro._s_addr = NULL;
4316					}
4317					net->src_addr_selected = 0;
4318				}
4319			}
4320			return (ret);
4321		}
4322#endif
4323#ifdef INET6
4324	case AF_INET6:
4325		{
4326			uint32_t flowlabel, flowinfo;
4327			struct ip6_hdr *ip6h;
4328			struct route_in6 ip6route;
4329			struct ifnet *ifp;
4330			struct sockaddr_in6 *sin6, tmp, *lsa6, lsa6_tmp;
4331			int prev_scope = 0;
4332			struct sockaddr_in6 lsa6_storage;
4333			int error;
4334			u_short prev_port = 0;
4335			int len;
4336
4337			if (net) {
4338				flowlabel = net->flowlabel;
4339			} else if (stcb) {
4340				flowlabel = stcb->asoc.default_flowlabel;
4341			} else {
4342				flowlabel = inp->sctp_ep.default_flowlabel;
4343			}
4344			if (flowlabel == 0) {
4345				/*
4346				 * This means especially, that it is not set
4347				 * at the SCTP layer. So use the value from
4348				 * the IP layer.
4349				 */
4350				flowlabel = ntohl(((struct in6pcb *)inp)->in6p_flowinfo);
4351			}
4352			flowlabel &= 0x000fffff;
4353			len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr);
4354			if (port) {
4355				len += sizeof(struct udphdr);
4356			}
4357			newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4358			if (newm == NULL) {
4359				sctp_m_freem(m);
4360				SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4361				return (ENOMEM);
4362			}
4363			SCTP_ALIGN_TO_END(newm, len);
4364			SCTP_BUF_LEN(newm) = len;
4365			SCTP_BUF_NEXT(newm) = m;
4366			m = newm;
4367			if (net != NULL) {
4368#ifdef INVARIANTS
4369				if (net->flowidset == 0) {
4370					panic("Flow ID not set");
4371				}
4372#endif
4373				m->m_pkthdr.flowid = net->flowid;
4374				m->m_flags |= M_FLOWID;
4375			} else {
4376				if (use_mflowid != 0) {
4377					m->m_pkthdr.flowid = mflowid;
4378					m->m_flags |= M_FLOWID;
4379				}
4380			}
4381			packet_length = sctp_calculate_len(m);
4382
4383			ip6h = mtod(m, struct ip6_hdr *);
4384			/* protect *sin6 from overwrite */
4385			sin6 = (struct sockaddr_in6 *)to;
4386			tmp = *sin6;
4387			sin6 = &tmp;
4388
4389			/* KAME hack: embed scopeid */
4390			if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4391				SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4392				return (EINVAL);
4393			}
4394			if (net == NULL) {
4395				memset(&ip6route, 0, sizeof(ip6route));
4396				ro = (sctp_route_t *) & ip6route;
4397				memcpy(&ro->ro_dst, sin6, sin6->sin6_len);
4398			} else {
4399				ro = (sctp_route_t *) & net->ro;
4400			}
4401			/*
4402			 * We assume here that inp_flow is in host byte
4403			 * order within the TCB!
4404			 */
4405			if (tos_value == 0) {
4406				/*
4407				 * This means especially, that it is not set
4408				 * at the SCTP layer. So use the value from
4409				 * the IP layer.
4410				 */
4411				tos_value = (ntohl(((struct in6pcb *)inp)->in6p_flowinfo) >> 20) & 0xff;
4412			}
4413			tos_value &= 0xfc;
4414			if (ecn_ok) {
4415				tos_value |= sctp_get_ect(stcb);
4416			}
4417			flowinfo = 0x06;
4418			flowinfo <<= 8;
4419			flowinfo |= tos_value;
4420			flowinfo <<= 20;
4421			flowinfo |= flowlabel;
4422			ip6h->ip6_flow = htonl(flowinfo);
4423			if (port) {
4424				ip6h->ip6_nxt = IPPROTO_UDP;
4425			} else {
4426				ip6h->ip6_nxt = IPPROTO_SCTP;
4427			}
4428			ip6h->ip6_plen = (packet_length - sizeof(struct ip6_hdr));
4429			ip6h->ip6_dst = sin6->sin6_addr;
4430
4431			/*
4432			 * Add SRC address selection here: we can only reuse
4433			 * to a limited degree the kame src-addr-sel, since
4434			 * we can try their selection but it may not be
4435			 * bound.
4436			 */
4437			bzero(&lsa6_tmp, sizeof(lsa6_tmp));
4438			lsa6_tmp.sin6_family = AF_INET6;
4439			lsa6_tmp.sin6_len = sizeof(lsa6_tmp);
4440			lsa6 = &lsa6_tmp;
4441			if (net && out_of_asoc_ok == 0) {
4442				if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4443					sctp_free_ifa(net->ro._s_addr);
4444					net->ro._s_addr = NULL;
4445					net->src_addr_selected = 0;
4446					if (ro->ro_rt) {
4447						RTFREE(ro->ro_rt);
4448						ro->ro_rt = NULL;
4449					}
4450				}
4451				if (net->src_addr_selected == 0) {
4452					sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4453					/* KAME hack: embed scopeid */
4454					if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4455						SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4456						return (EINVAL);
4457					}
4458					/* Cache the source address */
4459					net->ro._s_addr = sctp_source_address_selection(inp,
4460					    stcb,
4461					    ro,
4462					    net,
4463					    0,
4464					    vrf_id);
4465					(void)sa6_recoverscope(sin6);
4466					net->src_addr_selected = 1;
4467				}
4468				if (net->ro._s_addr == NULL) {
4469					SCTPDBG(SCTP_DEBUG_OUTPUT3, "V6:No route to host\n");
4470					net->src_addr_selected = 0;
4471					sctp_handle_no_route(stcb, net, so_locked);
4472					SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4473					sctp_m_freem(m);
4474					return (EHOSTUNREACH);
4475				}
4476				lsa6->sin6_addr = net->ro._s_addr->address.sin6.sin6_addr;
4477			} else {
4478				sin6 = (struct sockaddr_in6 *)&ro->ro_dst;
4479				/* KAME hack: embed scopeid */
4480				if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4481					SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4482					return (EINVAL);
4483				}
4484				if (over_addr == NULL) {
4485					struct sctp_ifa *_lsrc;
4486
4487					_lsrc = sctp_source_address_selection(inp, stcb, ro,
4488					    net,
4489					    out_of_asoc_ok,
4490					    vrf_id);
4491					if (_lsrc == NULL) {
4492						sctp_handle_no_route(stcb, net, so_locked);
4493						SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4494						sctp_m_freem(m);
4495						return (EHOSTUNREACH);
4496					}
4497					lsa6->sin6_addr = _lsrc->address.sin6.sin6_addr;
4498					sctp_free_ifa(_lsrc);
4499				} else {
4500					lsa6->sin6_addr = over_addr->sin6.sin6_addr;
4501					SCTP_RTALLOC(ro, vrf_id);
4502				}
4503				(void)sa6_recoverscope(sin6);
4504			}
4505			lsa6->sin6_port = inp->sctp_lport;
4506
4507			if (ro->ro_rt == NULL) {
4508				/*
4509				 * src addr selection failed to find a route
4510				 * (or valid source addr), so we can't get
4511				 * there from here!
4512				 */
4513				sctp_handle_no_route(stcb, net, so_locked);
4514				SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4515				sctp_m_freem(m);
4516				return (EHOSTUNREACH);
4517			}
4518			/*
4519			 * XXX: sa6 may not have a valid sin6_scope_id in
4520			 * the non-SCOPEDROUTING case.
4521			 */
4522			bzero(&lsa6_storage, sizeof(lsa6_storage));
4523			lsa6_storage.sin6_family = AF_INET6;
4524			lsa6_storage.sin6_len = sizeof(lsa6_storage);
4525			lsa6_storage.sin6_addr = lsa6->sin6_addr;
4526			if ((error = sa6_recoverscope(&lsa6_storage)) != 0) {
4527				SCTPDBG(SCTP_DEBUG_OUTPUT3, "recover scope fails error %d\n", error);
4528				sctp_m_freem(m);
4529				return (error);
4530			}
4531			/* XXX */
4532			lsa6_storage.sin6_addr = lsa6->sin6_addr;
4533			lsa6_storage.sin6_port = inp->sctp_lport;
4534			lsa6 = &lsa6_storage;
4535			ip6h->ip6_src = lsa6->sin6_addr;
4536
4537			if (port) {
4538				if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4539					sctp_handle_no_route(stcb, net, so_locked);
4540					SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4541					sctp_m_freem(m);
4542					return (EHOSTUNREACH);
4543				}
4544				udp = (struct udphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4545				udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4546				udp->uh_dport = port;
4547				udp->uh_ulen = htons(packet_length - sizeof(struct ip6_hdr));
4548				udp->uh_sum = 0;
4549				sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4550			} else {
4551				sctphdr = (struct sctphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4552			}
4553
4554			sctphdr->src_port = src_port;
4555			sctphdr->dest_port = dest_port;
4556			sctphdr->v_tag = v_tag;
4557			sctphdr->checksum = 0;
4558
4559			/*
4560			 * We set the hop limit now since there is a good
4561			 * chance that our ro pointer is now filled
4562			 */
4563			ip6h->ip6_hlim = SCTP_GET_HLIM(inp, ro);
4564			ifp = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
4565
4566#ifdef SCTP_DEBUG
4567			/* Copy to be sure something bad is not happening */
4568			sin6->sin6_addr = ip6h->ip6_dst;
4569			lsa6->sin6_addr = ip6h->ip6_src;
4570#endif
4571
4572			SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv6 output routine from low level\n");
4573			SCTPDBG(SCTP_DEBUG_OUTPUT3, "src: ");
4574			SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)lsa6);
4575			SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst: ");
4576			SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)sin6);
4577			if (net) {
4578				sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4579				/*
4580				 * preserve the port and scope for link
4581				 * local send
4582				 */
4583				prev_scope = sin6->sin6_scope_id;
4584				prev_port = sin6->sin6_port;
4585			}
4586			if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4587				/* failed to prepend data, give up */
4588				sctp_m_freem(m);
4589				SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4590				return (ENOMEM);
4591			}
4592			SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4593			if (port) {
4594#if defined(SCTP_WITH_NO_CSUM)
4595				SCTP_STAT_INCR(sctps_sendnocrc);
4596#else
4597				sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
4598				SCTP_STAT_INCR(sctps_sendswcrc);
4599#endif
4600				if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), packet_length - sizeof(struct ip6_hdr))) == 0) {
4601					udp->uh_sum = 0xffff;
4602				}
4603			} else {
4604#if defined(SCTP_WITH_NO_CSUM)
4605				SCTP_STAT_INCR(sctps_sendnocrc);
4606#else
4607				m->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
4608				m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4609				SCTP_STAT_INCR(sctps_sendhwcrc);
4610#endif
4611			}
4612			/* send it out. table id is taken from stcb */
4613#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4614			if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4615				so = SCTP_INP_SO(inp);
4616				SCTP_SOCKET_UNLOCK(so, 0);
4617			}
4618#endif
4619#ifdef SCTP_PACKET_LOGGING
4620			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4621				sctp_packet_log(o_pak);
4622#endif
4623			SCTP_IP6_OUTPUT(ret, o_pak, (struct route_in6 *)ro, &ifp, stcb, vrf_id);
4624#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4625			if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4626				atomic_add_int(&stcb->asoc.refcnt, 1);
4627				SCTP_TCB_UNLOCK(stcb);
4628				SCTP_SOCKET_LOCK(so, 0);
4629				SCTP_TCB_LOCK(stcb);
4630				atomic_subtract_int(&stcb->asoc.refcnt, 1);
4631			}
4632#endif
4633			if (net) {
4634				/* for link local this must be done */
4635				sin6->sin6_scope_id = prev_scope;
4636				sin6->sin6_port = prev_port;
4637			}
4638			SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
4639			SCTP_STAT_INCR(sctps_sendpackets);
4640			SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4641			if (ret) {
4642				SCTP_STAT_INCR(sctps_senderrors);
4643			}
4644			if (net == NULL) {
4645				/* Now if we had a temp route free it */
4646				RO_RTFREE(ro);
4647			} else {
4648				/*
4649				 * PMTU check versus smallest asoc MTU goes
4650				 * here
4651				 */
4652				if (ro->ro_rt == NULL) {
4653					/* Route was freed */
4654					if (net->ro._s_addr &&
4655					    net->src_addr_selected) {
4656						sctp_free_ifa(net->ro._s_addr);
4657						net->ro._s_addr = NULL;
4658					}
4659					net->src_addr_selected = 0;
4660				}
4661				if ((ro->ro_rt != NULL) &&
4662				    (net->ro._s_addr)) {
4663					uint32_t mtu;
4664
4665					mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4666					if (mtu &&
4667					    (stcb->asoc.smallest_mtu > mtu)) {
4668						sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4669						net->mtu = mtu;
4670						if (net->port) {
4671							net->mtu -= sizeof(struct udphdr);
4672						}
4673					}
4674				} else if (ifp) {
4675					if (ND_IFINFO(ifp)->linkmtu &&
4676					    (stcb->asoc.smallest_mtu > ND_IFINFO(ifp)->linkmtu)) {
4677						sctp_mtu_size_reset(inp,
4678						    &stcb->asoc,
4679						    ND_IFINFO(ifp)->linkmtu);
4680					}
4681				}
4682			}
4683			return (ret);
4684		}
4685#endif
4686	default:
4687		SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
4688		    ((struct sockaddr *)to)->sa_family);
4689		sctp_m_freem(m);
4690		SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4691		return (EFAULT);
4692	}
4693}
4694
4695
4696void
4697sctp_send_initiate(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int so_locked
4698#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
4699    SCTP_UNUSED
4700#endif
4701)
4702{
4703	struct mbuf *m, *m_last;
4704	struct sctp_nets *net;
4705	struct sctp_init_chunk *init;
4706	struct sctp_supported_addr_param *sup_addr;
4707	struct sctp_adaptation_layer_indication *ali;
4708	struct sctp_supported_chunk_types_param *pr_supported;
4709	struct sctp_paramhdr *ph;
4710	int cnt_inits_to = 0;
4711	int ret;
4712	uint16_t num_ext, chunk_len, padding_len, parameter_len;
4713
4714	/* INIT's always go to the primary (and usually ONLY address) */
4715	net = stcb->asoc.primary_destination;
4716	if (net == NULL) {
4717		net = TAILQ_FIRST(&stcb->asoc.nets);
4718		if (net == NULL) {
4719			/* TSNH */
4720			return;
4721		}
4722		/* we confirm any address we send an INIT to */
4723		net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4724		(void)sctp_set_primary_addr(stcb, NULL, net);
4725	} else {
4726		/* we confirm any address we send an INIT to */
4727		net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4728	}
4729	SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
4730#ifdef INET6
4731	if (net->ro._l_addr.sa.sa_family == AF_INET6) {
4732		/*
4733		 * special hook, if we are sending to link local it will not
4734		 * show up in our private address count.
4735		 */
4736		if (IN6_IS_ADDR_LINKLOCAL(&net->ro._l_addr.sin6.sin6_addr))
4737			cnt_inits_to = 1;
4738	}
4739#endif
4740	if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4741		/* This case should not happen */
4742		SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
4743		return;
4744	}
4745	/* start the INIT timer */
4746	sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
4747
4748	m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_NOWAIT, 1, MT_DATA);
4749	if (m == NULL) {
4750		/* No memory, INIT timer will re-attempt. */
4751		SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
4752		return;
4753	}
4754	chunk_len = (uint16_t) sizeof(struct sctp_init_chunk);
4755	padding_len = 0;
4756	/*
4757	 * assume peer supports asconf in order to be able to queue local
4758	 * address changes while an INIT is in flight and before the assoc
4759	 * is established.
4760	 */
4761	stcb->asoc.peer_supports_asconf = 1;
4762	/* Now lets put the chunk header in place */
4763	init = mtod(m, struct sctp_init_chunk *);
4764	/* now the chunk header */
4765	init->ch.chunk_type = SCTP_INITIATION;
4766	init->ch.chunk_flags = 0;
4767	/* fill in later from mbuf we build */
4768	init->ch.chunk_length = 0;
4769	/* place in my tag */
4770	init->init.initiate_tag = htonl(stcb->asoc.my_vtag);
4771	/* set up some of the credits. */
4772	init->init.a_rwnd = htonl(max(inp->sctp_socket ? SCTP_SB_LIMIT_RCV(inp->sctp_socket) : 0,
4773	    SCTP_MINIMAL_RWND));
4774	init->init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
4775	init->init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
4776	init->init.initial_tsn = htonl(stcb->asoc.init_seq_number);
4777
4778	/* Adaptation layer indication parameter */
4779	if (inp->sctp_ep.adaptation_layer_indicator_provided) {
4780		parameter_len = (uint16_t) sizeof(struct sctp_adaptation_layer_indication);
4781		ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
4782		ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
4783		ali->ph.param_length = htons(parameter_len);
4784		ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
4785		chunk_len += parameter_len;
4786	}
4787	/* ECN parameter */
4788	if (stcb->asoc.ecn_supported == 1) {
4789		parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4790		ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4791		ph->param_type = htons(SCTP_ECN_CAPABLE);
4792		ph->param_length = htons(parameter_len);
4793		chunk_len += parameter_len;
4794	}
4795	/* PR-SCTP supported parameter */
4796	if (stcb->asoc.prsctp_supported == 1) {
4797		parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4798		ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4799		ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
4800		ph->param_length = htons(parameter_len);
4801		chunk_len += parameter_len;
4802	}
4803	/* Add NAT friendly parameter. */
4804	if (SCTP_BASE_SYSCTL(sctp_inits_include_nat_friendly)) {
4805		parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4806		ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4807		ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
4808		ph->param_length = htons(parameter_len);
4809		chunk_len += parameter_len;
4810	}
4811	/* And now tell the peer which extensions we support */
4812	num_ext = 0;
4813	pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
4814	pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
4815	pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
4816	pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
4817	if (stcb->asoc.prsctp_supported == 1) {
4818		pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
4819	}
4820	if (stcb->asoc.pktdrop_supported == 1) {
4821		pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
4822	}
4823	if (stcb->asoc.reconfig_supported == 1) {
4824		pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
4825	}
4826	if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
4827		pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
4828	}
4829	if (stcb->asoc.nrsack_supported == 1) {
4830		pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
4831	}
4832	parameter_len = (uint16_t) sizeof(struct sctp_supported_chunk_types_param) + num_ext;
4833	pr_supported->ph.param_length = htons(parameter_len);
4834	padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4835	chunk_len += parameter_len;
4836
4837	/* add authentication parameters */
4838	if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
4839		/* attach RANDOM parameter, if available */
4840		if (stcb->asoc.authinfo.random != NULL) {
4841			struct sctp_auth_random *randp;
4842
4843			if (padding_len > 0) {
4844				memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4845				chunk_len += padding_len;
4846				padding_len = 0;
4847			}
4848			randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
4849			parameter_len = (uint16_t) sizeof(struct sctp_auth_random) + stcb->asoc.authinfo.random_len;
4850			/* random key already contains the header */
4851			memcpy(randp, stcb->asoc.authinfo.random->key, parameter_len);
4852			padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4853			chunk_len += parameter_len;
4854		}
4855		/* add HMAC_ALGO parameter */
4856		if ((stcb->asoc.local_hmacs != NULL) &&
4857		    (stcb->asoc.local_hmacs->num_algo > 0)) {
4858			struct sctp_auth_hmac_algo *hmacs;
4859
4860			if (padding_len > 0) {
4861				memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4862				chunk_len += padding_len;
4863				padding_len = 0;
4864			}
4865			hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
4866			parameter_len = (uint16_t) (sizeof(struct sctp_auth_hmac_algo) +
4867			    stcb->asoc.local_hmacs->num_algo * sizeof(uint16_t));
4868			hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
4869			hmacs->ph.param_length = htons(parameter_len);
4870			sctp_serialize_hmaclist(stcb->asoc.local_hmacs, (uint8_t *) hmacs->hmac_ids);
4871			padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4872			chunk_len += parameter_len;
4873		}
4874		/* add CHUNKS parameter */
4875		if (sctp_auth_get_chklist_size(stcb->asoc.local_auth_chunks) > 0) {
4876			struct sctp_auth_chunk_list *chunks;
4877
4878			if (padding_len > 0) {
4879				memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4880				chunk_len += padding_len;
4881				padding_len = 0;
4882			}
4883			chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
4884			parameter_len = (uint16_t) (sizeof(struct sctp_auth_chunk_list) +
4885			    sctp_auth_get_chklist_size(stcb->asoc.local_auth_chunks));
4886			chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
4887			chunks->ph.param_length = htons(parameter_len);
4888			sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks, chunks->chunk_types);
4889			padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4890			chunk_len += parameter_len;
4891		}
4892	}
4893	/* now any cookie time extensions */
4894	if (stcb->asoc.cookie_preserve_req) {
4895		struct sctp_cookie_perserve_param *cookie_preserve;
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_cookie_perserve_param);
4903		cookie_preserve = (struct sctp_cookie_perserve_param *)(mtod(m, caddr_t)+chunk_len);
4904		cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
4905		cookie_preserve->ph.param_length = htons(parameter_len);
4906		cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
4907		stcb->asoc.cookie_preserve_req = 0;
4908		chunk_len += parameter_len;
4909	}
4910	if (stcb->asoc.scope.ipv4_addr_legal || stcb->asoc.scope.ipv6_addr_legal) {
4911		uint8_t i;
4912
4913		if (padding_len > 0) {
4914			memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4915			chunk_len += padding_len;
4916			padding_len = 0;
4917		}
4918		parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4919		if (stcb->asoc.scope.ipv4_addr_legal) {
4920			parameter_len += (uint16_t) sizeof(uint16_t);
4921		}
4922		if (stcb->asoc.scope.ipv6_addr_legal) {
4923			parameter_len += (uint16_t) sizeof(uint16_t);
4924		}
4925		sup_addr = (struct sctp_supported_addr_param *)(mtod(m, caddr_t)+chunk_len);
4926		sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
4927		sup_addr->ph.param_length = htons(parameter_len);
4928		i = 0;
4929		if (stcb->asoc.scope.ipv4_addr_legal) {
4930			sup_addr->addr_type[i++] = htons(SCTP_IPV4_ADDRESS);
4931		}
4932		if (stcb->asoc.scope.ipv6_addr_legal) {
4933			sup_addr->addr_type[i++] = htons(SCTP_IPV6_ADDRESS);
4934		}
4935		padding_len = 4 - 2 * i;
4936		chunk_len += parameter_len;
4937	}
4938	SCTP_BUF_LEN(m) = chunk_len;
4939	/* now the addresses */
4940	/*
4941	 * To optimize this we could put the scoping stuff into a structure
4942	 * and remove the individual uint8's from the assoc structure. Then
4943	 * we could just sifa in the address within the stcb. But for now
4944	 * this is a quick hack to get the address stuff teased apart.
4945	 */
4946	m_last = sctp_add_addresses_to_i_ia(inp, stcb, &stcb->asoc.scope,
4947	    m, cnt_inits_to,
4948	    &padding_len, &chunk_len);
4949
4950	init->ch.chunk_length = htons(chunk_len);
4951	if (padding_len > 0) {
4952		if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
4953			sctp_m_freem(m);
4954			return;
4955		}
4956	}
4957	SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - calls lowlevel_output\n");
4958	ret = sctp_lowlevel_chunk_output(inp, stcb, net,
4959	    (struct sockaddr *)&net->ro._l_addr,
4960	    m, 0, NULL, 0, 0, 0, 0,
4961	    inp->sctp_lport, stcb->rport, htonl(0),
4962	    net->port, NULL,
4963	    0, 0,
4964	    so_locked);
4965	SCTPDBG(SCTP_DEBUG_OUTPUT4, "lowlevel_output - %d\n", ret);
4966	SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
4967	(void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
4968}
4969
4970struct mbuf *
4971sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
4972    int param_offset, int *abort_processing, struct sctp_chunkhdr *cp, int *nat_friendly)
4973{
4974	/*
4975	 * Given a mbuf containing an INIT or INIT-ACK with the param_offset
4976	 * being equal to the beginning of the params i.e. (iphlen +
4977	 * sizeof(struct sctp_init_msg) parse through the parameters to the
4978	 * end of the mbuf verifying that all parameters are known.
4979	 *
4980	 * For unknown parameters build and return a mbuf with
4981	 * UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
4982	 * processing this chunk stop, and set *abort_processing to 1.
4983	 *
4984	 * By having param_offset be pre-set to where parameters begin it is
4985	 * hoped that this routine may be reused in the future by new
4986	 * features.
4987	 */
4988	struct sctp_paramhdr *phdr, params;
4989
4990	struct mbuf *mat, *op_err;
4991	char tempbuf[SCTP_PARAM_BUFFER_SIZE];
4992	int at, limit, pad_needed;
4993	uint16_t ptype, plen, padded_size;
4994	int err_at;
4995
4996	*abort_processing = 0;
4997	mat = in_initpkt;
4998	err_at = 0;
4999	limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
5000	at = param_offset;
5001	op_err = NULL;
5002	SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
5003	phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
5004	while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
5005		ptype = ntohs(phdr->param_type);
5006		plen = ntohs(phdr->param_length);
5007		if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
5008			/* wacked parameter */
5009			SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
5010			goto invalid_size;
5011		}
5012		limit -= SCTP_SIZE32(plen);
5013		/*-
5014		 * All parameters for all chunks that we know/understand are
5015		 * listed here. We process them other places and make
5016		 * appropriate stop actions per the upper bits. However this
5017		 * is the generic routine processor's can call to get back
5018		 * an operr.. to either incorporate (init-ack) or send.
5019		 */
5020		padded_size = SCTP_SIZE32(plen);
5021		switch (ptype) {
5022			/* Param's with variable size */
5023		case SCTP_HEARTBEAT_INFO:
5024		case SCTP_STATE_COOKIE:
5025		case SCTP_UNRECOG_PARAM:
5026		case SCTP_ERROR_CAUSE_IND:
5027			/* ok skip fwd */
5028			at += padded_size;
5029			break;
5030			/* Param's with variable size within a range */
5031		case SCTP_CHUNK_LIST:
5032		case SCTP_SUPPORTED_CHUNK_EXT:
5033			if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
5034				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
5035				goto invalid_size;
5036			}
5037			at += padded_size;
5038			break;
5039		case SCTP_SUPPORTED_ADDRTYPE:
5040			if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
5041				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
5042				goto invalid_size;
5043			}
5044			at += padded_size;
5045			break;
5046		case SCTP_RANDOM:
5047			if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
5048				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
5049				goto invalid_size;
5050			}
5051			at += padded_size;
5052			break;
5053		case SCTP_SET_PRIM_ADDR:
5054		case SCTP_DEL_IP_ADDRESS:
5055		case SCTP_ADD_IP_ADDRESS:
5056			if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
5057			    (padded_size != sizeof(struct sctp_asconf_addr_param))) {
5058				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
5059				goto invalid_size;
5060			}
5061			at += padded_size;
5062			break;
5063			/* Param's with a fixed size */
5064		case SCTP_IPV4_ADDRESS:
5065			if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
5066				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
5067				goto invalid_size;
5068			}
5069			at += padded_size;
5070			break;
5071		case SCTP_IPV6_ADDRESS:
5072			if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
5073				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
5074				goto invalid_size;
5075			}
5076			at += padded_size;
5077			break;
5078		case SCTP_COOKIE_PRESERVE:
5079			if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
5080				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
5081				goto invalid_size;
5082			}
5083			at += padded_size;
5084			break;
5085		case SCTP_HAS_NAT_SUPPORT:
5086			*nat_friendly = 1;
5087			/* fall through */
5088		case SCTP_PRSCTP_SUPPORTED:
5089			if (padded_size != sizeof(struct sctp_paramhdr)) {
5090				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error prsctp/nat support %d\n", plen);
5091				goto invalid_size;
5092			}
5093			at += padded_size;
5094			break;
5095		case SCTP_ECN_CAPABLE:
5096			if (padded_size != sizeof(struct sctp_paramhdr)) {
5097				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
5098				goto invalid_size;
5099			}
5100			at += padded_size;
5101			break;
5102		case SCTP_ULP_ADAPTATION:
5103			if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
5104				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
5105				goto invalid_size;
5106			}
5107			at += padded_size;
5108			break;
5109		case SCTP_SUCCESS_REPORT:
5110			if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
5111				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
5112				goto invalid_size;
5113			}
5114			at += padded_size;
5115			break;
5116		case SCTP_HOSTNAME_ADDRESS:
5117			{
5118				/* We can NOT handle HOST NAME addresses!! */
5119				int l_len;
5120
5121				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
5122				*abort_processing = 1;
5123				if (op_err == NULL) {
5124					/* Ok need to try to get a mbuf */
5125#ifdef INET6
5126					l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5127#else
5128					l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5129#endif
5130					l_len += plen;
5131					l_len += sizeof(struct sctp_paramhdr);
5132					op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5133					if (op_err) {
5134						SCTP_BUF_LEN(op_err) = 0;
5135						/*
5136						 * pre-reserve space for ip
5137						 * and sctp header  and
5138						 * chunk hdr
5139						 */
5140#ifdef INET6
5141						SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5142#else
5143						SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5144#endif
5145						SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5146						SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5147					}
5148				}
5149				if (op_err) {
5150					/* If we have space */
5151					struct sctp_paramhdr s;
5152
5153					if (err_at % 4) {
5154						uint32_t cpthis = 0;
5155
5156						pad_needed = 4 - (err_at % 4);
5157						m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5158						err_at += pad_needed;
5159					}
5160					s.param_type = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
5161					s.param_length = htons(sizeof(s) + plen);
5162					m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5163					err_at += sizeof(s);
5164					phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
5165					if (phdr == NULL) {
5166						sctp_m_freem(op_err);
5167						/*
5168						 * we are out of memory but
5169						 * we still need to have a
5170						 * look at what to do (the
5171						 * system is in trouble
5172						 * though).
5173						 */
5174						return (NULL);
5175					}
5176					m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5177				}
5178				return (op_err);
5179				break;
5180			}
5181		default:
5182			/*
5183			 * we do not recognize the parameter figure out what
5184			 * we do.
5185			 */
5186			SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
5187			if ((ptype & 0x4000) == 0x4000) {
5188				/* Report bit is set?? */
5189				SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
5190				if (op_err == NULL) {
5191					int l_len;
5192
5193					/* Ok need to try to get an mbuf */
5194#ifdef INET6
5195					l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5196#else
5197					l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5198#endif
5199					l_len += plen;
5200					l_len += sizeof(struct sctp_paramhdr);
5201					op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5202					if (op_err) {
5203						SCTP_BUF_LEN(op_err) = 0;
5204#ifdef INET6
5205						SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5206#else
5207						SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5208#endif
5209						SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5210						SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5211					}
5212				}
5213				if (op_err) {
5214					/* If we have space */
5215					struct sctp_paramhdr s;
5216
5217					if (err_at % 4) {
5218						uint32_t cpthis = 0;
5219
5220						pad_needed = 4 - (err_at % 4);
5221						m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5222						err_at += pad_needed;
5223					}
5224					s.param_type = htons(SCTP_UNRECOG_PARAM);
5225					s.param_length = htons(sizeof(s) + plen);
5226					m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5227					err_at += sizeof(s);
5228					if (plen > sizeof(tempbuf)) {
5229						plen = sizeof(tempbuf);
5230					}
5231					phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
5232					if (phdr == NULL) {
5233						sctp_m_freem(op_err);
5234						/*
5235						 * we are out of memory but
5236						 * we still need to have a
5237						 * look at what to do (the
5238						 * system is in trouble
5239						 * though).
5240						 */
5241						op_err = NULL;
5242						goto more_processing;
5243					}
5244					m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5245					err_at += plen;
5246				}
5247			}
5248	more_processing:
5249			if ((ptype & 0x8000) == 0x0000) {
5250				SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
5251				return (op_err);
5252			} else {
5253				/* skip this chunk and continue processing */
5254				SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
5255				at += SCTP_SIZE32(plen);
5256			}
5257			break;
5258
5259		}
5260		phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
5261	}
5262	return (op_err);
5263invalid_size:
5264	SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
5265	*abort_processing = 1;
5266	if ((op_err == NULL) && phdr) {
5267		int l_len;
5268
5269#ifdef INET6
5270		l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5271#else
5272		l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5273#endif
5274		l_len += (2 * sizeof(struct sctp_paramhdr));
5275		op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5276		if (op_err) {
5277			SCTP_BUF_LEN(op_err) = 0;
5278#ifdef INET6
5279			SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5280#else
5281			SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5282#endif
5283			SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5284			SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5285		}
5286	}
5287	if ((op_err) && phdr) {
5288		struct sctp_paramhdr s;
5289
5290		if (err_at % 4) {
5291			uint32_t cpthis = 0;
5292
5293			pad_needed = 4 - (err_at % 4);
5294			m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5295			err_at += pad_needed;
5296		}
5297		s.param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
5298		s.param_length = htons(sizeof(s) + sizeof(struct sctp_paramhdr));
5299		m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5300		err_at += sizeof(s);
5301		/* Only copy back the p-hdr that caused the issue */
5302		m_copyback(op_err, err_at, sizeof(struct sctp_paramhdr), (caddr_t)phdr);
5303	}
5304	return (op_err);
5305}
5306
5307static int
5308sctp_are_there_new_addresses(struct sctp_association *asoc,
5309    struct mbuf *in_initpkt, int offset, struct sockaddr *src)
5310{
5311	/*
5312	 * Given a INIT packet, look through the packet to verify that there
5313	 * are NO new addresses. As we go through the parameters add reports
5314	 * of any un-understood parameters that require an error.  Also we
5315	 * must return (1) to drop the packet if we see a un-understood
5316	 * parameter that tells us to drop the chunk.
5317	 */
5318	struct sockaddr *sa_touse;
5319	struct sockaddr *sa;
5320	struct sctp_paramhdr *phdr, params;
5321	uint16_t ptype, plen;
5322	uint8_t fnd;
5323	struct sctp_nets *net;
5324
5325#ifdef INET
5326	struct sockaddr_in sin4, *sa4;
5327
5328#endif
5329#ifdef INET6
5330	struct sockaddr_in6 sin6, *sa6;
5331
5332#endif
5333
5334#ifdef INET
5335	memset(&sin4, 0, sizeof(sin4));
5336	sin4.sin_family = AF_INET;
5337	sin4.sin_len = sizeof(sin4);
5338#endif
5339#ifdef INET6
5340	memset(&sin6, 0, sizeof(sin6));
5341	sin6.sin6_family = AF_INET6;
5342	sin6.sin6_len = sizeof(sin6);
5343#endif
5344	/* First what about the src address of the pkt ? */
5345	fnd = 0;
5346	TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5347		sa = (struct sockaddr *)&net->ro._l_addr;
5348		if (sa->sa_family == src->sa_family) {
5349#ifdef INET
5350			if (sa->sa_family == AF_INET) {
5351				struct sockaddr_in *src4;
5352
5353				sa4 = (struct sockaddr_in *)sa;
5354				src4 = (struct sockaddr_in *)src;
5355				if (sa4->sin_addr.s_addr == src4->sin_addr.s_addr) {
5356					fnd = 1;
5357					break;
5358				}
5359			}
5360#endif
5361#ifdef INET6
5362			if (sa->sa_family == AF_INET6) {
5363				struct sockaddr_in6 *src6;
5364
5365				sa6 = (struct sockaddr_in6 *)sa;
5366				src6 = (struct sockaddr_in6 *)src;
5367				if (SCTP6_ARE_ADDR_EQUAL(sa6, src6)) {
5368					fnd = 1;
5369					break;
5370				}
5371			}
5372#endif
5373		}
5374	}
5375	if (fnd == 0) {
5376		/* New address added! no need to look futher. */
5377		return (1);
5378	}
5379	/* Ok so far lets munge through the rest of the packet */
5380	offset += sizeof(struct sctp_init_chunk);
5381	phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5382	while (phdr) {
5383		sa_touse = NULL;
5384		ptype = ntohs(phdr->param_type);
5385		plen = ntohs(phdr->param_length);
5386		switch (ptype) {
5387#ifdef INET
5388		case SCTP_IPV4_ADDRESS:
5389			{
5390				struct sctp_ipv4addr_param *p4, p4_buf;
5391
5392				phdr = sctp_get_next_param(in_initpkt, offset,
5393				    (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
5394				if (plen != sizeof(struct sctp_ipv4addr_param) ||
5395				    phdr == NULL) {
5396					return (1);
5397				}
5398				p4 = (struct sctp_ipv4addr_param *)phdr;
5399				sin4.sin_addr.s_addr = p4->addr;
5400				sa_touse = (struct sockaddr *)&sin4;
5401				break;
5402			}
5403#endif
5404#ifdef INET6
5405		case SCTP_IPV6_ADDRESS:
5406			{
5407				struct sctp_ipv6addr_param *p6, p6_buf;
5408
5409				phdr = sctp_get_next_param(in_initpkt, offset,
5410				    (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
5411				if (plen != sizeof(struct sctp_ipv6addr_param) ||
5412				    phdr == NULL) {
5413					return (1);
5414				}
5415				p6 = (struct sctp_ipv6addr_param *)phdr;
5416				memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
5417				    sizeof(p6->addr));
5418				sa_touse = (struct sockaddr *)&sin6;
5419				break;
5420			}
5421#endif
5422		default:
5423			sa_touse = NULL;
5424			break;
5425		}
5426		if (sa_touse) {
5427			/* ok, sa_touse points to one to check */
5428			fnd = 0;
5429			TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5430				sa = (struct sockaddr *)&net->ro._l_addr;
5431				if (sa->sa_family != sa_touse->sa_family) {
5432					continue;
5433				}
5434#ifdef INET
5435				if (sa->sa_family == AF_INET) {
5436					sa4 = (struct sockaddr_in *)sa;
5437					if (sa4->sin_addr.s_addr ==
5438					    sin4.sin_addr.s_addr) {
5439						fnd = 1;
5440						break;
5441					}
5442				}
5443#endif
5444#ifdef INET6
5445				if (sa->sa_family == AF_INET6) {
5446					sa6 = (struct sockaddr_in6 *)sa;
5447					if (SCTP6_ARE_ADDR_EQUAL(
5448					    sa6, &sin6)) {
5449						fnd = 1;
5450						break;
5451					}
5452				}
5453#endif
5454			}
5455			if (!fnd) {
5456				/* New addr added! no need to look further */
5457				return (1);
5458			}
5459		}
5460		offset += SCTP_SIZE32(plen);
5461		phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5462	}
5463	return (0);
5464}
5465
5466/*
5467 * Given a MBUF chain that was sent into us containing an INIT. Build a
5468 * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
5469 * a pullup to include IPv6/4header, SCTP header and initial part of INIT
5470 * message (i.e. the struct sctp_init_msg).
5471 */
5472void
5473sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
5474    struct mbuf *init_pkt, int iphlen, int offset,
5475    struct sockaddr *src, struct sockaddr *dst,
5476    struct sctphdr *sh, struct sctp_init_chunk *init_chk,
5477    uint8_t use_mflowid, uint32_t mflowid,
5478    uint32_t vrf_id, uint16_t port, int hold_inp_lock)
5479{
5480	struct sctp_association *asoc;
5481	struct mbuf *m, *m_tmp, *m_last, *m_cookie, *op_err;
5482	struct sctp_init_ack_chunk *initack;
5483	struct sctp_adaptation_layer_indication *ali;
5484	struct sctp_supported_chunk_types_param *pr_supported;
5485	struct sctp_paramhdr *ph;
5486	union sctp_sockstore *over_addr;
5487	struct sctp_scoping scp;
5488
5489#ifdef INET
5490	struct sockaddr_in *dst4 = (struct sockaddr_in *)dst;
5491	struct sockaddr_in *src4 = (struct sockaddr_in *)src;
5492	struct sockaddr_in *sin;
5493
5494#endif
5495#ifdef INET6
5496	struct sockaddr_in6 *dst6 = (struct sockaddr_in6 *)dst;
5497	struct sockaddr_in6 *src6 = (struct sockaddr_in6 *)src;
5498	struct sockaddr_in6 *sin6;
5499
5500#endif
5501	struct sockaddr *to;
5502	struct sctp_state_cookie stc;
5503	struct sctp_nets *net = NULL;
5504	uint8_t *signature = NULL;
5505	int cnt_inits_to = 0;
5506	uint16_t his_limit, i_want;
5507	int abort_flag;
5508	int nat_friendly = 0;
5509	struct socket *so;
5510	uint16_t num_ext, chunk_len, padding_len, parameter_len;
5511
5512	if (stcb) {
5513		asoc = &stcb->asoc;
5514	} else {
5515		asoc = NULL;
5516	}
5517	if ((asoc != NULL) &&
5518	    (SCTP_GET_STATE(asoc) != SCTP_STATE_COOKIE_WAIT) &&
5519	    (sctp_are_there_new_addresses(asoc, init_pkt, offset, src))) {
5520		/* new addresses, out of here in non-cookie-wait states */
5521		/*
5522		 * Send a ABORT, we don't add the new address error clause
5523		 * though we even set the T bit and copy in the 0 tag.. this
5524		 * looks no different than if no listener was present.
5525		 */
5526		op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5527		    "Address added");
5528		sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5529		    use_mflowid, mflowid,
5530		    vrf_id, port);
5531		return;
5532	}
5533	abort_flag = 0;
5534	op_err = sctp_arethere_unrecognized_parameters(init_pkt,
5535	    (offset + sizeof(struct sctp_init_chunk)),
5536	    &abort_flag, (struct sctp_chunkhdr *)init_chk, &nat_friendly);
5537	if (abort_flag) {
5538do_a_abort:
5539		if (op_err == NULL) {
5540			char msg[SCTP_DIAG_INFO_LEN];
5541
5542			snprintf(msg, sizeof(msg), "%s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__);
5543			op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5544			    msg);
5545		}
5546		sctp_send_abort(init_pkt, iphlen, src, dst, sh,
5547		    init_chk->init.initiate_tag, op_err,
5548		    use_mflowid, mflowid,
5549		    vrf_id, port);
5550		return;
5551	}
5552	m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
5553	if (m == NULL) {
5554		/* No memory, INIT timer will re-attempt. */
5555		if (op_err)
5556			sctp_m_freem(op_err);
5557		return;
5558	}
5559	chunk_len = (uint16_t) sizeof(struct sctp_init_ack_chunk);
5560	padding_len = 0;
5561
5562	/*
5563	 * We might not overwrite the identification[] completely and on
5564	 * some platforms time_entered will contain some padding. Therefore
5565	 * zero out the cookie to avoid putting uninitialized memory on the
5566	 * wire.
5567	 */
5568	memset(&stc, 0, sizeof(struct sctp_state_cookie));
5569
5570	/* the time I built cookie */
5571	(void)SCTP_GETTIME_TIMEVAL(&stc.time_entered);
5572
5573	/* populate any tie tags */
5574	if (asoc != NULL) {
5575		/* unlock before tag selections */
5576		stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
5577		stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
5578		stc.cookie_life = asoc->cookie_life;
5579		net = asoc->primary_destination;
5580	} else {
5581		stc.tie_tag_my_vtag = 0;
5582		stc.tie_tag_peer_vtag = 0;
5583		/* life I will award this cookie */
5584		stc.cookie_life = inp->sctp_ep.def_cookie_life;
5585	}
5586
5587	/* copy in the ports for later check */
5588	stc.myport = sh->dest_port;
5589	stc.peerport = sh->src_port;
5590
5591	/*
5592	 * If we wanted to honor cookie life extentions, we would add to
5593	 * stc.cookie_life. For now we should NOT honor any extension
5594	 */
5595	stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
5596	if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5597		stc.ipv6_addr_legal = 1;
5598		if (SCTP_IPV6_V6ONLY(inp)) {
5599			stc.ipv4_addr_legal = 0;
5600		} else {
5601			stc.ipv4_addr_legal = 1;
5602		}
5603	} else {
5604		stc.ipv6_addr_legal = 0;
5605		stc.ipv4_addr_legal = 1;
5606	}
5607#ifdef SCTP_DONT_DO_PRIVADDR_SCOPE
5608	stc.ipv4_scope = 1;
5609#else
5610	stc.ipv4_scope = 0;
5611#endif
5612	if (net == NULL) {
5613		to = src;
5614		switch (dst->sa_family) {
5615#ifdef INET
5616		case AF_INET:
5617			{
5618				/* lookup address */
5619				stc.address[0] = src4->sin_addr.s_addr;
5620				stc.address[1] = 0;
5621				stc.address[2] = 0;
5622				stc.address[3] = 0;
5623				stc.addr_type = SCTP_IPV4_ADDRESS;
5624				/* local from address */
5625				stc.laddress[0] = dst4->sin_addr.s_addr;
5626				stc.laddress[1] = 0;
5627				stc.laddress[2] = 0;
5628				stc.laddress[3] = 0;
5629				stc.laddr_type = SCTP_IPV4_ADDRESS;
5630				/* scope_id is only for v6 */
5631				stc.scope_id = 0;
5632#ifndef SCTP_DONT_DO_PRIVADDR_SCOPE
5633				if (IN4_ISPRIVATE_ADDRESS(&src4->sin_addr)) {
5634					stc.ipv4_scope = 1;
5635				}
5636#else
5637				stc.ipv4_scope = 1;
5638#endif				/* SCTP_DONT_DO_PRIVADDR_SCOPE */
5639				/* Must use the address in this case */
5640				if (sctp_is_address_on_local_host(src, vrf_id)) {
5641					stc.loopback_scope = 1;
5642					stc.ipv4_scope = 1;
5643					stc.site_scope = 1;
5644					stc.local_scope = 0;
5645				}
5646				break;
5647			}
5648#endif
5649#ifdef INET6
5650		case AF_INET6:
5651			{
5652				stc.addr_type = SCTP_IPV6_ADDRESS;
5653				memcpy(&stc.address, &src6->sin6_addr, sizeof(struct in6_addr));
5654				stc.scope_id = in6_getscope(&src6->sin6_addr);
5655				if (sctp_is_address_on_local_host(src, vrf_id)) {
5656					stc.loopback_scope = 1;
5657					stc.local_scope = 0;
5658					stc.site_scope = 1;
5659					stc.ipv4_scope = 1;
5660				} else if (IN6_IS_ADDR_LINKLOCAL(&src6->sin6_addr)) {
5661					/*
5662					 * If the new destination is a
5663					 * LINK_LOCAL we must have common
5664					 * both site and local scope. Don't
5665					 * set local scope though since we
5666					 * must depend on the source to be
5667					 * added implicitly. We cannot
5668					 * assure just because we share one
5669					 * link that all links are common.
5670					 */
5671					stc.local_scope = 0;
5672					stc.site_scope = 1;
5673					stc.ipv4_scope = 1;
5674					/*
5675					 * we start counting for the private
5676					 * address stuff at 1. since the
5677					 * link local we source from won't
5678					 * show up in our scoped count.
5679					 */
5680					cnt_inits_to = 1;
5681					/*
5682					 * pull out the scope_id from
5683					 * incoming pkt
5684					 */
5685				} else if (IN6_IS_ADDR_SITELOCAL(&src6->sin6_addr)) {
5686					/*
5687					 * If the new destination is
5688					 * SITE_LOCAL then we must have site
5689					 * scope in common.
5690					 */
5691					stc.site_scope = 1;
5692				}
5693				memcpy(&stc.laddress, &dst6->sin6_addr, sizeof(struct in6_addr));
5694				stc.laddr_type = SCTP_IPV6_ADDRESS;
5695				break;
5696			}
5697#endif
5698		default:
5699			/* TSNH */
5700			goto do_a_abort;
5701			break;
5702		}
5703	} else {
5704		/* set the scope per the existing tcb */
5705
5706#ifdef INET6
5707		struct sctp_nets *lnet;
5708
5709#endif
5710
5711		stc.loopback_scope = asoc->scope.loopback_scope;
5712		stc.ipv4_scope = asoc->scope.ipv4_local_scope;
5713		stc.site_scope = asoc->scope.site_scope;
5714		stc.local_scope = asoc->scope.local_scope;
5715#ifdef INET6
5716		/* Why do we not consider IPv4 LL addresses? */
5717		TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
5718			if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
5719				if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
5720					/*
5721					 * if we have a LL address, start
5722					 * counting at 1.
5723					 */
5724					cnt_inits_to = 1;
5725				}
5726			}
5727		}
5728#endif
5729		/* use the net pointer */
5730		to = (struct sockaddr *)&net->ro._l_addr;
5731		switch (to->sa_family) {
5732#ifdef INET
5733		case AF_INET:
5734			sin = (struct sockaddr_in *)to;
5735			stc.address[0] = sin->sin_addr.s_addr;
5736			stc.address[1] = 0;
5737			stc.address[2] = 0;
5738			stc.address[3] = 0;
5739			stc.addr_type = SCTP_IPV4_ADDRESS;
5740			if (net->src_addr_selected == 0) {
5741				/*
5742				 * strange case here, the INIT should have
5743				 * did the selection.
5744				 */
5745				net->ro._s_addr = sctp_source_address_selection(inp,
5746				    stcb, (sctp_route_t *) & net->ro,
5747				    net, 0, vrf_id);
5748				if (net->ro._s_addr == NULL)
5749					return;
5750
5751				net->src_addr_selected = 1;
5752
5753			}
5754			stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
5755			stc.laddress[1] = 0;
5756			stc.laddress[2] = 0;
5757			stc.laddress[3] = 0;
5758			stc.laddr_type = SCTP_IPV4_ADDRESS;
5759			/* scope_id is only for v6 */
5760			stc.scope_id = 0;
5761			break;
5762#endif
5763#ifdef INET6
5764		case AF_INET6:
5765			sin6 = (struct sockaddr_in6 *)to;
5766			memcpy(&stc.address, &sin6->sin6_addr,
5767			    sizeof(struct in6_addr));
5768			stc.addr_type = SCTP_IPV6_ADDRESS;
5769			stc.scope_id = sin6->sin6_scope_id;
5770			if (net->src_addr_selected == 0) {
5771				/*
5772				 * strange case here, the INIT should have
5773				 * done the selection.
5774				 */
5775				net->ro._s_addr = sctp_source_address_selection(inp,
5776				    stcb, (sctp_route_t *) & net->ro,
5777				    net, 0, vrf_id);
5778				if (net->ro._s_addr == NULL)
5779					return;
5780
5781				net->src_addr_selected = 1;
5782			}
5783			memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
5784			    sizeof(struct in6_addr));
5785			stc.laddr_type = SCTP_IPV6_ADDRESS;
5786			break;
5787#endif
5788		}
5789	}
5790	/* Now lets put the SCTP header in place */
5791	initack = mtod(m, struct sctp_init_ack_chunk *);
5792	/* Save it off for quick ref */
5793	stc.peers_vtag = init_chk->init.initiate_tag;
5794	/* who are we */
5795	memcpy(stc.identification, SCTP_VERSION_STRING,
5796	    min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
5797	memset(stc.reserved, 0, SCTP_RESERVE_SPACE);
5798	/* now the chunk header */
5799	initack->ch.chunk_type = SCTP_INITIATION_ACK;
5800	initack->ch.chunk_flags = 0;
5801	/* fill in later from mbuf we build */
5802	initack->ch.chunk_length = 0;
5803	/* place in my tag */
5804	if ((asoc != NULL) &&
5805	    ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
5806	    (SCTP_GET_STATE(asoc) == SCTP_STATE_INUSE) ||
5807	    (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED))) {
5808		/* re-use the v-tags and init-seq here */
5809		initack->init.initiate_tag = htonl(asoc->my_vtag);
5810		initack->init.initial_tsn = htonl(asoc->init_seq_number);
5811	} else {
5812		uint32_t vtag, itsn;
5813
5814		if (hold_inp_lock) {
5815			SCTP_INP_INCR_REF(inp);
5816			SCTP_INP_RUNLOCK(inp);
5817		}
5818		if (asoc) {
5819			atomic_add_int(&asoc->refcnt, 1);
5820			SCTP_TCB_UNLOCK(stcb);
5821	new_tag:
5822			vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5823			if ((asoc->peer_supports_nat) && (vtag == asoc->my_vtag)) {
5824				/*
5825				 * Got a duplicate vtag on some guy behind a
5826				 * nat make sure we don't use it.
5827				 */
5828				goto new_tag;
5829			}
5830			initack->init.initiate_tag = htonl(vtag);
5831			/* get a TSN to use too */
5832			itsn = sctp_select_initial_TSN(&inp->sctp_ep);
5833			initack->init.initial_tsn = htonl(itsn);
5834			SCTP_TCB_LOCK(stcb);
5835			atomic_add_int(&asoc->refcnt, -1);
5836		} else {
5837			vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5838			initack->init.initiate_tag = htonl(vtag);
5839			/* get a TSN to use too */
5840			initack->init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
5841		}
5842		if (hold_inp_lock) {
5843			SCTP_INP_RLOCK(inp);
5844			SCTP_INP_DECR_REF(inp);
5845		}
5846	}
5847	/* save away my tag to */
5848	stc.my_vtag = initack->init.initiate_tag;
5849
5850	/* set up some of the credits. */
5851	so = inp->sctp_socket;
5852	if (so == NULL) {
5853		/* memory problem */
5854		sctp_m_freem(m);
5855		return;
5856	} else {
5857		initack->init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
5858	}
5859	/* set what I want */
5860	his_limit = ntohs(init_chk->init.num_inbound_streams);
5861	/* choose what I want */
5862	if (asoc != NULL) {
5863		if (asoc->streamoutcnt > inp->sctp_ep.pre_open_stream_count) {
5864			i_want = asoc->streamoutcnt;
5865		} else {
5866			i_want = inp->sctp_ep.pre_open_stream_count;
5867		}
5868	} else {
5869		i_want = inp->sctp_ep.pre_open_stream_count;
5870	}
5871	if (his_limit < i_want) {
5872		/* I Want more :< */
5873		initack->init.num_outbound_streams = init_chk->init.num_inbound_streams;
5874	} else {
5875		/* I can have what I want :> */
5876		initack->init.num_outbound_streams = htons(i_want);
5877	}
5878	/* tell him his limit. */
5879	initack->init.num_inbound_streams =
5880	    htons(inp->sctp_ep.max_open_streams_intome);
5881
5882	/* adaptation layer indication parameter */
5883	if (inp->sctp_ep.adaptation_layer_indicator_provided) {
5884		parameter_len = (uint16_t) sizeof(struct sctp_adaptation_layer_indication);
5885		ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
5886		ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
5887		ali->ph.param_length = htons(parameter_len);
5888		ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
5889		chunk_len += parameter_len;
5890	}
5891	/* ECN parameter */
5892	if (((asoc != NULL) && (asoc->ecn_supported == 1)) ||
5893	    ((asoc == NULL) && (inp->ecn_supported == 1))) {
5894		parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
5895		ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5896		ph->param_type = htons(SCTP_ECN_CAPABLE);
5897		ph->param_length = htons(parameter_len);
5898		chunk_len += parameter_len;
5899	}
5900	/* PR-SCTP supported parameter */
5901	if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5902	    ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5903		parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
5904		ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5905		ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
5906		ph->param_length = htons(parameter_len);
5907		chunk_len += parameter_len;
5908	}
5909	/* Add NAT friendly parameter */
5910	if (nat_friendly) {
5911		parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
5912		ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5913		ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
5914		ph->param_length = htons(sizeof(struct sctp_paramhdr));
5915		chunk_len += sizeof(struct sctp_paramhdr);
5916	}
5917	/* And now tell the peer which extensions we support */
5918	num_ext = 0;
5919	pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
5920	pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
5921	pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
5922	pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
5923	if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5924	    ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5925		pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
5926	}
5927	if (((asoc != NULL) && (asoc->pktdrop_supported == 1)) ||
5928	    ((asoc == NULL) && (inp->pktdrop_supported == 1))) {
5929		pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
5930	}
5931	if (((asoc != NULL) && (asoc->reconfig_supported == 1)) ||
5932	    ((asoc == NULL) && (inp->reconfig_supported == 1))) {
5933		pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
5934	}
5935	if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
5936		pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
5937	}
5938	if (((asoc != NULL) && (asoc->nrsack_supported == 1)) ||
5939	    ((asoc == NULL) && (inp->nrsack_supported == 1))) {
5940		pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
5941	}
5942	parameter_len = (uint16_t) sizeof(struct sctp_supported_chunk_types_param) + num_ext;
5943	pr_supported->ph.param_length = htons(parameter_len);
5944	padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
5945	chunk_len += parameter_len;
5946
5947	/* add authentication parameters */
5948	if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
5949		struct sctp_auth_random *randp;
5950		struct sctp_auth_hmac_algo *hmacs;
5951		struct sctp_auth_chunk_list *chunks;
5952
5953		if (padding_len > 0) {
5954			memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
5955			chunk_len += padding_len;
5956			padding_len = 0;
5957		}
5958		/* generate and add RANDOM parameter */
5959		randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
5960		parameter_len = (uint16_t) sizeof(struct sctp_auth_random) +
5961		    SCTP_AUTH_RANDOM_SIZE_DEFAULT;
5962		randp->ph.param_type = htons(SCTP_RANDOM);
5963		randp->ph.param_length = htons(parameter_len);
5964		SCTP_READ_RANDOM(randp->random_data, SCTP_AUTH_RANDOM_SIZE_DEFAULT);
5965		padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
5966		chunk_len += parameter_len;
5967
5968		if (padding_len > 0) {
5969			memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
5970			chunk_len += padding_len;
5971			padding_len = 0;
5972		}
5973		/* add HMAC_ALGO parameter */
5974		hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
5975		parameter_len = (uint16_t) sizeof(struct sctp_auth_hmac_algo) +
5976		    sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
5977		    (uint8_t *) hmacs->hmac_ids);
5978		hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
5979		hmacs->ph.param_length = htons(parameter_len);
5980		padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
5981		chunk_len += parameter_len;
5982
5983		if (padding_len > 0) {
5984			memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
5985			chunk_len += padding_len;
5986			padding_len = 0;
5987		}
5988		/* add CHUNKS parameter */
5989		chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
5990		parameter_len = (uint16_t) sizeof(struct sctp_auth_chunk_list) +
5991		    sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
5992		    chunks->chunk_types);
5993		chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
5994		chunks->ph.param_length = htons(parameter_len);
5995		padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
5996		chunk_len += parameter_len;
5997	}
5998	SCTP_BUF_LEN(m) = chunk_len;
5999	m_last = m;
6000	/* now the addresses */
6001	/*
6002	 * To optimize this we could put the scoping stuff into a structure
6003	 * and remove the individual uint8's from the stc structure. Then we
6004	 * could just sifa in the address within the stc.. but for now this
6005	 * is a quick hack to get the address stuff teased apart.
6006	 */
6007	scp.ipv4_addr_legal = stc.ipv4_addr_legal;
6008	scp.ipv6_addr_legal = stc.ipv6_addr_legal;
6009	scp.loopback_scope = stc.loopback_scope;
6010	scp.ipv4_local_scope = stc.ipv4_scope;
6011	scp.local_scope = stc.local_scope;
6012	scp.site_scope = stc.site_scope;
6013	m_last = sctp_add_addresses_to_i_ia(inp, stcb, &scp, m_last,
6014	    cnt_inits_to,
6015	    &padding_len, &chunk_len);
6016	/* padding_len can only be positive, if no addresses have been added */
6017	if (padding_len > 0) {
6018		memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6019		chunk_len += padding_len;
6020		SCTP_BUF_LEN(m) += padding_len;
6021		padding_len = 0;
6022	}
6023	/* tack on the operational error if present */
6024	if (op_err) {
6025		parameter_len = 0;
6026		for (m_tmp = op_err; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6027			parameter_len += SCTP_BUF_LEN(m_tmp);
6028		}
6029		padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6030		SCTP_BUF_NEXT(m_last) = op_err;
6031		while (SCTP_BUF_NEXT(m_last) != NULL) {
6032			m_last = SCTP_BUF_NEXT(m_last);
6033		}
6034		chunk_len += parameter_len;
6035	}
6036	if (padding_len > 0) {
6037		m_last = sctp_add_pad_tombuf(m_last, padding_len);
6038		if (m_last == NULL) {
6039			/* Houston we have a problem, no space */
6040			sctp_m_freem(m);
6041			return;
6042		}
6043		chunk_len += padding_len;
6044		padding_len = 0;
6045	}
6046	/* Now we must build a cookie */
6047	m_cookie = sctp_add_cookie(init_pkt, offset, m, 0, &stc, &signature);
6048	if (m_cookie == NULL) {
6049		/* memory problem */
6050		sctp_m_freem(m);
6051		return;
6052	}
6053	/* Now append the cookie to the end and update the space/size */
6054	SCTP_BUF_NEXT(m_last) = m_cookie;
6055	parameter_len = 0;
6056	for (m_tmp = m_cookie; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6057		parameter_len += SCTP_BUF_LEN(m_tmp);
6058		if (SCTP_BUF_NEXT(m_tmp) == NULL) {
6059			m_last = m_tmp;
6060		}
6061	}
6062	padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6063	chunk_len += parameter_len;
6064
6065	/*
6066	 * Place in the size, but we don't include the last pad (if any) in
6067	 * the INIT-ACK.
6068	 */
6069	initack->ch.chunk_length = htons(chunk_len);
6070
6071	/*
6072	 * Time to sign the cookie, we don't sign over the cookie signature
6073	 * though thus we set trailer.
6074	 */
6075	(void)sctp_hmac_m(SCTP_HMAC,
6076	    (uint8_t *) inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
6077	    SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
6078	    (uint8_t *) signature, SCTP_SIGNATURE_SIZE);
6079	/*
6080	 * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
6081	 * here since the timer will drive a retranmission.
6082	 */
6083	if (padding_len > 0) {
6084		if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
6085			sctp_m_freem(m);
6086			return;
6087		}
6088	}
6089	if (stc.loopback_scope) {
6090		over_addr = (union sctp_sockstore *)dst;
6091	} else {
6092		over_addr = NULL;
6093	}
6094
6095	(void)sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
6096	    0, 0,
6097	    inp->sctp_lport, sh->src_port, init_chk->init.initiate_tag,
6098	    port, over_addr,
6099	    use_mflowid, mflowid,
6100	    SCTP_SO_NOT_LOCKED);
6101	SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
6102}
6103
6104
6105static void
6106sctp_prune_prsctp(struct sctp_tcb *stcb,
6107    struct sctp_association *asoc,
6108    struct sctp_sndrcvinfo *srcv,
6109    int dataout)
6110{
6111	int freed_spc = 0;
6112	struct sctp_tmit_chunk *chk, *nchk;
6113
6114	SCTP_TCB_LOCK_ASSERT(stcb);
6115	if ((asoc->prsctp_supported) &&
6116	    (asoc->sent_queue_cnt_removeable > 0)) {
6117		TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
6118			/*
6119			 * Look for chunks marked with the PR_SCTP flag AND
6120			 * the buffer space flag. If the one being sent is
6121			 * equal or greater priority then purge the old one
6122			 * and free some space.
6123			 */
6124			if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6125				/*
6126				 * This one is PR-SCTP AND buffer space
6127				 * limited type
6128				 */
6129				if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6130					/*
6131					 * Lower numbers equates to higher
6132					 * priority so if the one we are
6133					 * looking at has a larger or equal
6134					 * priority we want to drop the data
6135					 * and NOT retransmit it.
6136					 */
6137					if (chk->data) {
6138						/*
6139						 * We release the book_size
6140						 * if the mbuf is here
6141						 */
6142						int ret_spc;
6143						uint8_t sent;
6144
6145						if (chk->sent > SCTP_DATAGRAM_UNSENT)
6146							sent = 1;
6147						else
6148							sent = 0;
6149						ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6150						    sent,
6151						    SCTP_SO_LOCKED);
6152						freed_spc += ret_spc;
6153						if (freed_spc >= dataout) {
6154							return;
6155						}
6156					}	/* if chunk was present */
6157				}	/* if of sufficent priority */
6158			}	/* if chunk has enabled */
6159		}		/* tailqforeach */
6160
6161		TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
6162			/* Here we must move to the sent queue and mark */
6163			if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6164				if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6165					if (chk->data) {
6166						/*
6167						 * We release the book_size
6168						 * if the mbuf is here
6169						 */
6170						int ret_spc;
6171
6172						ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6173						    0, SCTP_SO_LOCKED);
6174
6175						freed_spc += ret_spc;
6176						if (freed_spc >= dataout) {
6177							return;
6178						}
6179					}	/* end if chk->data */
6180				}	/* end if right class */
6181			}	/* end if chk pr-sctp */
6182		}		/* tailqforeachsafe (chk) */
6183	}			/* if enabled in asoc */
6184}
6185
6186int
6187sctp_get_frag_point(struct sctp_tcb *stcb,
6188    struct sctp_association *asoc)
6189{
6190	int siz, ovh;
6191
6192	/*
6193	 * For endpoints that have both v6 and v4 addresses we must reserve
6194	 * room for the ipv6 header, for those that are only dealing with V4
6195	 * we use a larger frag point.
6196	 */
6197	if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
6198		ovh = SCTP_MED_OVERHEAD;
6199	} else {
6200		ovh = SCTP_MED_V4_OVERHEAD;
6201	}
6202
6203	if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
6204		siz = asoc->smallest_mtu - ovh;
6205	else
6206		siz = (stcb->asoc.sctp_frag_point - ovh);
6207	/*
6208	 * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
6209	 */
6210	/* A data chunk MUST fit in a cluster */
6211	/* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
6212	/* } */
6213
6214	/* adjust for an AUTH chunk if DATA requires auth */
6215	if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
6216		siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
6217
6218	if (siz % 4) {
6219		/* make it an even word boundary please */
6220		siz -= (siz % 4);
6221	}
6222	return (siz);
6223}
6224
6225static void
6226sctp_set_prsctp_policy(struct sctp_stream_queue_pending *sp)
6227{
6228	/*
6229	 * We assume that the user wants PR_SCTP_TTL if the user provides a
6230	 * positive lifetime but does not specify any PR_SCTP policy.
6231	 */
6232	if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
6233		sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6234	} else if (sp->timetolive > 0) {
6235		sp->sinfo_flags |= SCTP_PR_SCTP_TTL;
6236		sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6237	} else {
6238		return;
6239	}
6240	switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
6241	case CHUNK_FLAGS_PR_SCTP_BUF:
6242		/*
6243		 * Time to live is a priority stored in tv_sec when doing
6244		 * the buffer drop thing.
6245		 */
6246		sp->ts.tv_sec = sp->timetolive;
6247		sp->ts.tv_usec = 0;
6248		break;
6249	case CHUNK_FLAGS_PR_SCTP_TTL:
6250		{
6251			struct timeval tv;
6252
6253			(void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6254			tv.tv_sec = sp->timetolive / 1000;
6255			tv.tv_usec = (sp->timetolive * 1000) % 1000000;
6256			/*
6257			 * TODO sctp_constants.h needs alternative time
6258			 * macros when _KERNEL is undefined.
6259			 */
6260			timevaladd(&sp->ts, &tv);
6261		}
6262		break;
6263	case CHUNK_FLAGS_PR_SCTP_RTX:
6264		/*
6265		 * Time to live is a the number or retransmissions stored in
6266		 * tv_sec.
6267		 */
6268		sp->ts.tv_sec = sp->timetolive;
6269		sp->ts.tv_usec = 0;
6270		break;
6271	default:
6272		SCTPDBG(SCTP_DEBUG_USRREQ1,
6273		    "Unknown PR_SCTP policy %u.\n",
6274		    PR_SCTP_POLICY(sp->sinfo_flags));
6275		break;
6276	}
6277}
6278
6279static int
6280sctp_msg_append(struct sctp_tcb *stcb,
6281    struct sctp_nets *net,
6282    struct mbuf *m,
6283    struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
6284{
6285	int error = 0;
6286	struct mbuf *at;
6287	struct sctp_stream_queue_pending *sp = NULL;
6288	struct sctp_stream_out *strm;
6289
6290	/*
6291	 * Given an mbuf chain, put it into the association send queue and
6292	 * place it on the wheel
6293	 */
6294	if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
6295		/* Invalid stream number */
6296		SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6297		error = EINVAL;
6298		goto out_now;
6299	}
6300	if ((stcb->asoc.stream_locked) &&
6301	    (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
6302		SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6303		error = EINVAL;
6304		goto out_now;
6305	}
6306	strm = &stcb->asoc.strmout[srcv->sinfo_stream];
6307	/* Now can we send this? */
6308	if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
6309	    (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
6310	    (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
6311	    (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
6312		/* got data while shutting down */
6313		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
6314		error = ECONNRESET;
6315		goto out_now;
6316	}
6317	sctp_alloc_a_strmoq(stcb, sp);
6318	if (sp == NULL) {
6319		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6320		error = ENOMEM;
6321		goto out_now;
6322	}
6323	sp->sinfo_flags = srcv->sinfo_flags;
6324	sp->timetolive = srcv->sinfo_timetolive;
6325	sp->ppid = srcv->sinfo_ppid;
6326	sp->context = srcv->sinfo_context;
6327	if (sp->sinfo_flags & SCTP_ADDR_OVER) {
6328		sp->net = net;
6329		atomic_add_int(&sp->net->ref_count, 1);
6330	} else {
6331		sp->net = NULL;
6332	}
6333	(void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6334	sp->stream = srcv->sinfo_stream;
6335	sp->msg_is_complete = 1;
6336	sp->sender_all_done = 1;
6337	sp->some_taken = 0;
6338	sp->data = m;
6339	sp->tail_mbuf = NULL;
6340	sctp_set_prsctp_policy(sp);
6341	/*
6342	 * We could in theory (for sendall) sifa the length in, but we would
6343	 * still have to hunt through the chain since we need to setup the
6344	 * tail_mbuf
6345	 */
6346	sp->length = 0;
6347	for (at = m; at; at = SCTP_BUF_NEXT(at)) {
6348		if (SCTP_BUF_NEXT(at) == NULL)
6349			sp->tail_mbuf = at;
6350		sp->length += SCTP_BUF_LEN(at);
6351	}
6352	if (srcv->sinfo_keynumber_valid) {
6353		sp->auth_keyid = srcv->sinfo_keynumber;
6354	} else {
6355		sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
6356	}
6357	if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
6358		sctp_auth_key_acquire(stcb, sp->auth_keyid);
6359		sp->holds_key_ref = 1;
6360	}
6361	if (hold_stcb_lock == 0) {
6362		SCTP_TCB_SEND_LOCK(stcb);
6363	}
6364	sctp_snd_sb_alloc(stcb, sp->length);
6365	atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
6366	TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
6367	stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, &stcb->asoc, strm, sp, 1);
6368	m = NULL;
6369	if (hold_stcb_lock == 0) {
6370		SCTP_TCB_SEND_UNLOCK(stcb);
6371	}
6372out_now:
6373	if (m) {
6374		sctp_m_freem(m);
6375	}
6376	return (error);
6377}
6378
6379
6380static struct mbuf *
6381sctp_copy_mbufchain(struct mbuf *clonechain,
6382    struct mbuf *outchain,
6383    struct mbuf **endofchain,
6384    int can_take_mbuf,
6385    int sizeofcpy,
6386    uint8_t copy_by_ref)
6387{
6388	struct mbuf *m;
6389	struct mbuf *appendchain;
6390	caddr_t cp;
6391	int len;
6392
6393	if (endofchain == NULL) {
6394		/* error */
6395error_out:
6396		if (outchain)
6397			sctp_m_freem(outchain);
6398		return (NULL);
6399	}
6400	if (can_take_mbuf) {
6401		appendchain = clonechain;
6402	} else {
6403		if (!copy_by_ref &&
6404		    (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))
6405		    ) {
6406			/* Its not in a cluster */
6407			if (*endofchain == NULL) {
6408				/* lets get a mbuf cluster */
6409				if (outchain == NULL) {
6410					/* This is the general case */
6411			new_mbuf:
6412					outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6413					if (outchain == NULL) {
6414						goto error_out;
6415					}
6416					SCTP_BUF_LEN(outchain) = 0;
6417					*endofchain = outchain;
6418					/* get the prepend space */
6419					SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
6420				} else {
6421					/*
6422					 * We really should not get a NULL
6423					 * in endofchain
6424					 */
6425					/* find end */
6426					m = outchain;
6427					while (m) {
6428						if (SCTP_BUF_NEXT(m) == NULL) {
6429							*endofchain = m;
6430							break;
6431						}
6432						m = SCTP_BUF_NEXT(m);
6433					}
6434					/* sanity */
6435					if (*endofchain == NULL) {
6436						/*
6437						 * huh, TSNH XXX maybe we
6438						 * should panic
6439						 */
6440						sctp_m_freem(outchain);
6441						goto new_mbuf;
6442					}
6443				}
6444				/* get the new end of length */
6445				len = M_TRAILINGSPACE(*endofchain);
6446			} else {
6447				/* how much is left at the end? */
6448				len = M_TRAILINGSPACE(*endofchain);
6449			}
6450			/* Find the end of the data, for appending */
6451			cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
6452
6453			/* Now lets copy it out */
6454			if (len >= sizeofcpy) {
6455				/* It all fits, copy it in */
6456				m_copydata(clonechain, 0, sizeofcpy, cp);
6457				SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6458			} else {
6459				/* fill up the end of the chain */
6460				if (len > 0) {
6461					m_copydata(clonechain, 0, len, cp);
6462					SCTP_BUF_LEN((*endofchain)) += len;
6463					/* now we need another one */
6464					sizeofcpy -= len;
6465				}
6466				m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6467				if (m == NULL) {
6468					/* We failed */
6469					goto error_out;
6470				}
6471				SCTP_BUF_NEXT((*endofchain)) = m;
6472				*endofchain = m;
6473				cp = mtod((*endofchain), caddr_t);
6474				m_copydata(clonechain, len, sizeofcpy, cp);
6475				SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6476			}
6477			return (outchain);
6478		} else {
6479			/* copy the old fashion way */
6480			appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_NOWAIT);
6481#ifdef SCTP_MBUF_LOGGING
6482			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6483				struct mbuf *mat;
6484
6485				for (mat = appendchain; mat; mat = SCTP_BUF_NEXT(mat)) {
6486					if (SCTP_BUF_IS_EXTENDED(mat)) {
6487						sctp_log_mb(mat, SCTP_MBUF_ICOPY);
6488					}
6489				}
6490			}
6491#endif
6492		}
6493	}
6494	if (appendchain == NULL) {
6495		/* error */
6496		if (outchain)
6497			sctp_m_freem(outchain);
6498		return (NULL);
6499	}
6500	if (outchain) {
6501		/* tack on to the end */
6502		if (*endofchain != NULL) {
6503			SCTP_BUF_NEXT(((*endofchain))) = appendchain;
6504		} else {
6505			m = outchain;
6506			while (m) {
6507				if (SCTP_BUF_NEXT(m) == NULL) {
6508					SCTP_BUF_NEXT(m) = appendchain;
6509					break;
6510				}
6511				m = SCTP_BUF_NEXT(m);
6512			}
6513		}
6514		/*
6515		 * save off the end and update the end-chain postion
6516		 */
6517		m = appendchain;
6518		while (m) {
6519			if (SCTP_BUF_NEXT(m) == NULL) {
6520				*endofchain = m;
6521				break;
6522			}
6523			m = SCTP_BUF_NEXT(m);
6524		}
6525		return (outchain);
6526	} else {
6527		/* save off the end and update the end-chain postion */
6528		m = appendchain;
6529		while (m) {
6530			if (SCTP_BUF_NEXT(m) == NULL) {
6531				*endofchain = m;
6532				break;
6533			}
6534			m = SCTP_BUF_NEXT(m);
6535		}
6536		return (appendchain);
6537	}
6538}
6539
6540static int
6541sctp_med_chunk_output(struct sctp_inpcb *inp,
6542    struct sctp_tcb *stcb,
6543    struct sctp_association *asoc,
6544    int *num_out,
6545    int *reason_code,
6546    int control_only, int from_where,
6547    struct timeval *now, int *now_filled, int frag_point, int so_locked
6548#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6549    SCTP_UNUSED
6550#endif
6551);
6552
6553static void
6554sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
6555    uint32_t val SCTP_UNUSED)
6556{
6557	struct sctp_copy_all *ca;
6558	struct mbuf *m;
6559	int ret = 0;
6560	int added_control = 0;
6561	int un_sent, do_chunk_output = 1;
6562	struct sctp_association *asoc;
6563	struct sctp_nets *net;
6564
6565	ca = (struct sctp_copy_all *)ptr;
6566	if (ca->m == NULL) {
6567		return;
6568	}
6569	if (ca->inp != inp) {
6570		/* TSNH */
6571		return;
6572	}
6573	if (ca->sndlen > 0) {
6574		m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_NOWAIT);
6575		if (m == NULL) {
6576			/* can't copy so we are done */
6577			ca->cnt_failed++;
6578			return;
6579		}
6580#ifdef SCTP_MBUF_LOGGING
6581		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6582			struct mbuf *mat;
6583
6584			for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
6585				if (SCTP_BUF_IS_EXTENDED(mat)) {
6586					sctp_log_mb(mat, SCTP_MBUF_ICOPY);
6587				}
6588			}
6589		}
6590#endif
6591	} else {
6592		m = NULL;
6593	}
6594	SCTP_TCB_LOCK_ASSERT(stcb);
6595	if (stcb->asoc.alternate) {
6596		net = stcb->asoc.alternate;
6597	} else {
6598		net = stcb->asoc.primary_destination;
6599	}
6600	if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
6601		/* Abort this assoc with m as the user defined reason */
6602		if (m != NULL) {
6603			SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_NOWAIT);
6604		} else {
6605			m = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
6606			    0, M_NOWAIT, 1, MT_DATA);
6607			SCTP_BUF_LEN(m) = sizeof(struct sctp_paramhdr);
6608		}
6609		if (m != NULL) {
6610			struct sctp_paramhdr *ph;
6611
6612			ph = mtod(m, struct sctp_paramhdr *);
6613			ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
6614			ph->param_length = htons(sizeof(struct sctp_paramhdr) + ca->sndlen);
6615		}
6616		/*
6617		 * We add one here to keep the assoc from dis-appearing on
6618		 * us.
6619		 */
6620		atomic_add_int(&stcb->asoc.refcnt, 1);
6621		sctp_abort_an_association(inp, stcb, m, SCTP_SO_NOT_LOCKED);
6622		/*
6623		 * sctp_abort_an_association calls sctp_free_asoc() free
6624		 * association will NOT free it since we incremented the
6625		 * refcnt .. we do this to prevent it being freed and things
6626		 * getting tricky since we could end up (from free_asoc)
6627		 * calling inpcb_free which would get a recursive lock call
6628		 * to the iterator lock.. But as a consequence of that the
6629		 * stcb will return to us un-locked.. since free_asoc
6630		 * returns with either no TCB or the TCB unlocked, we must
6631		 * relock.. to unlock in the iterator timer :-0
6632		 */
6633		SCTP_TCB_LOCK(stcb);
6634		atomic_add_int(&stcb->asoc.refcnt, -1);
6635		goto no_chunk_output;
6636	} else {
6637		if (m) {
6638			ret = sctp_msg_append(stcb, net, m,
6639			    &ca->sndrcv, 1);
6640		}
6641		asoc = &stcb->asoc;
6642		if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
6643			/* shutdown this assoc */
6644			int cnt;
6645
6646			cnt = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED);
6647
6648			if (TAILQ_EMPTY(&asoc->send_queue) &&
6649			    TAILQ_EMPTY(&asoc->sent_queue) &&
6650			    (cnt == 0)) {
6651				if (asoc->locked_on_sending) {
6652					goto abort_anyway;
6653				}
6654				/*
6655				 * there is nothing queued to send, so I'm
6656				 * done...
6657				 */
6658				if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6659				    (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6660				    (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6661					/*
6662					 * only send SHUTDOWN the first time
6663					 * through
6664					 */
6665					if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
6666						SCTP_STAT_DECR_GAUGE32(sctps_currestab);
6667					}
6668					SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
6669					SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
6670					sctp_stop_timers_for_shutdown(stcb);
6671					sctp_send_shutdown(stcb, net);
6672					sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
6673					    net);
6674					sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6675					    asoc->primary_destination);
6676					added_control = 1;
6677					do_chunk_output = 0;
6678				}
6679			} else {
6680				/*
6681				 * we still got (or just got) data to send,
6682				 * so set SHUTDOWN_PENDING
6683				 */
6684				/*
6685				 * XXX sockets draft says that SCTP_EOF
6686				 * should be sent with no data.  currently,
6687				 * we will allow user data to be sent first
6688				 * and move to SHUTDOWN-PENDING
6689				 */
6690				if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6691				    (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6692				    (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6693					if (asoc->locked_on_sending) {
6694						/*
6695						 * Locked to send out the
6696						 * data
6697						 */
6698						struct sctp_stream_queue_pending *sp;
6699
6700						sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
6701						if (sp) {
6702							if ((sp->length == 0) && (sp->msg_is_complete == 0))
6703								asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
6704						}
6705					}
6706					asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
6707					if (TAILQ_EMPTY(&asoc->send_queue) &&
6708					    TAILQ_EMPTY(&asoc->sent_queue) &&
6709					    (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
6710				abort_anyway:
6711						atomic_add_int(&stcb->asoc.refcnt, 1);
6712						sctp_abort_an_association(stcb->sctp_ep, stcb,
6713						    NULL, SCTP_SO_NOT_LOCKED);
6714						atomic_add_int(&stcb->asoc.refcnt, -1);
6715						goto no_chunk_output;
6716					}
6717					sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6718					    asoc->primary_destination);
6719				}
6720			}
6721
6722		}
6723	}
6724	un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
6725	    (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
6726
6727	if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
6728	    (stcb->asoc.total_flight > 0) &&
6729	    (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
6730		do_chunk_output = 0;
6731	}
6732	if (do_chunk_output)
6733		sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
6734	else if (added_control) {
6735		int num_out = 0, reason = 0, now_filled = 0;
6736		struct timeval now;
6737		int frag_point;
6738
6739		frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
6740		(void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
6741		    &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
6742	}
6743no_chunk_output:
6744	if (ret) {
6745		ca->cnt_failed++;
6746	} else {
6747		ca->cnt_sent++;
6748	}
6749}
6750
6751static void
6752sctp_sendall_completes(void *ptr, uint32_t val SCTP_UNUSED)
6753{
6754	struct sctp_copy_all *ca;
6755
6756	ca = (struct sctp_copy_all *)ptr;
6757	/*
6758	 * Do a notify here? Kacheong suggests that the notify be done at
6759	 * the send time.. so you would push up a notification if any send
6760	 * failed. Don't know if this is feasable since the only failures we
6761	 * have is "memory" related and if you cannot get an mbuf to send
6762	 * the data you surely can't get an mbuf to send up to notify the
6763	 * user you can't send the data :->
6764	 */
6765
6766	/* now free everything */
6767	sctp_m_freem(ca->m);
6768	SCTP_FREE(ca, SCTP_M_COPYAL);
6769}
6770
6771
6772#define	MC_ALIGN(m, len) do {						\
6773	SCTP_BUF_RESV_UF(m, ((MCLBYTES - (len)) & ~(sizeof(long) - 1));	\
6774} while (0)
6775
6776
6777
6778static struct mbuf *
6779sctp_copy_out_all(struct uio *uio, int len)
6780{
6781	struct mbuf *ret, *at;
6782	int left, willcpy, cancpy, error;
6783
6784	ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAITOK, 1, MT_DATA);
6785	if (ret == NULL) {
6786		/* TSNH */
6787		return (NULL);
6788	}
6789	left = len;
6790	SCTP_BUF_LEN(ret) = 0;
6791	/* save space for the data chunk header */
6792	cancpy = M_TRAILINGSPACE(ret);
6793	willcpy = min(cancpy, left);
6794	at = ret;
6795	while (left > 0) {
6796		/* Align data to the end */
6797		error = uiomove(mtod(at, caddr_t), willcpy, uio);
6798		if (error) {
6799	err_out_now:
6800			sctp_m_freem(at);
6801			return (NULL);
6802		}
6803		SCTP_BUF_LEN(at) = willcpy;
6804		SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
6805		left -= willcpy;
6806		if (left > 0) {
6807			SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg(left, 0, M_WAITOK, 1, MT_DATA);
6808			if (SCTP_BUF_NEXT(at) == NULL) {
6809				goto err_out_now;
6810			}
6811			at = SCTP_BUF_NEXT(at);
6812			SCTP_BUF_LEN(at) = 0;
6813			cancpy = M_TRAILINGSPACE(at);
6814			willcpy = min(cancpy, left);
6815		}
6816	}
6817	return (ret);
6818}
6819
6820static int
6821sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
6822    struct sctp_sndrcvinfo *srcv)
6823{
6824	int ret;
6825	struct sctp_copy_all *ca;
6826
6827	SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
6828	    SCTP_M_COPYAL);
6829	if (ca == NULL) {
6830		sctp_m_freem(m);
6831		SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6832		return (ENOMEM);
6833	}
6834	memset(ca, 0, sizeof(struct sctp_copy_all));
6835
6836	ca->inp = inp;
6837	if (srcv) {
6838		memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
6839	}
6840	/*
6841	 * take off the sendall flag, it would be bad if we failed to do
6842	 * this :-0
6843	 */
6844	ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
6845	/* get length and mbuf chain */
6846	if (uio) {
6847		ca->sndlen = uio->uio_resid;
6848		ca->m = sctp_copy_out_all(uio, ca->sndlen);
6849		if (ca->m == NULL) {
6850			SCTP_FREE(ca, SCTP_M_COPYAL);
6851			SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6852			return (ENOMEM);
6853		}
6854	} else {
6855		/* Gather the length of the send */
6856		struct mbuf *mat;
6857
6858		ca->sndlen = 0;
6859		for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
6860			ca->sndlen += SCTP_BUF_LEN(mat);
6861		}
6862	}
6863	ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
6864	    SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
6865	    SCTP_ASOC_ANY_STATE,
6866	    (void *)ca, 0,
6867	    sctp_sendall_completes, inp, 1);
6868	if (ret) {
6869		SCTP_PRINTF("Failed to initiate iterator for sendall\n");
6870		SCTP_FREE(ca, SCTP_M_COPYAL);
6871		SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
6872		return (EFAULT);
6873	}
6874	return (0);
6875}
6876
6877
6878void
6879sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
6880{
6881	struct sctp_tmit_chunk *chk, *nchk;
6882
6883	TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6884		if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
6885			TAILQ_REMOVE(&asoc->control_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
6896void
6897sctp_toss_old_asconf(struct sctp_tcb *stcb)
6898{
6899	struct sctp_association *asoc;
6900	struct sctp_tmit_chunk *chk, *nchk;
6901	struct sctp_asconf_chunk *acp;
6902
6903	asoc = &stcb->asoc;
6904	TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
6905		/* find SCTP_ASCONF chunk in queue */
6906		if (chk->rec.chunk_id.id == SCTP_ASCONF) {
6907			if (chk->data) {
6908				acp = mtod(chk->data, struct sctp_asconf_chunk *);
6909				if (SCTP_TSN_GT(ntohl(acp->serial_number), asoc->asconf_seq_out_acked)) {
6910					/* Not Acked yet */
6911					break;
6912				}
6913			}
6914			TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
6915			if (chk->data) {
6916				sctp_m_freem(chk->data);
6917				chk->data = NULL;
6918			}
6919			asoc->ctrl_queue_cnt--;
6920			sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6921		}
6922	}
6923}
6924
6925
6926static void
6927sctp_clean_up_datalist(struct sctp_tcb *stcb,
6928    struct sctp_association *asoc,
6929    struct sctp_tmit_chunk **data_list,
6930    int bundle_at,
6931    struct sctp_nets *net)
6932{
6933	int i;
6934	struct sctp_tmit_chunk *tp1;
6935
6936	for (i = 0; i < bundle_at; i++) {
6937		/* off of the send queue */
6938		TAILQ_REMOVE(&asoc->send_queue, data_list[i], sctp_next);
6939		asoc->send_queue_cnt--;
6940		if (i > 0) {
6941			/*
6942			 * Any chunk NOT 0 you zap the time chunk 0 gets
6943			 * zapped or set based on if a RTO measurment is
6944			 * needed.
6945			 */
6946			data_list[i]->do_rtt = 0;
6947		}
6948		/* record time */
6949		data_list[i]->sent_rcv_time = net->last_sent_time;
6950		data_list[i]->rec.data.cwnd_at_send = net->cwnd;
6951		data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.TSN_seq;
6952		if (data_list[i]->whoTo == NULL) {
6953			data_list[i]->whoTo = net;
6954			atomic_add_int(&net->ref_count, 1);
6955		}
6956		/* on to the sent queue */
6957		tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
6958		if ((tp1) && SCTP_TSN_GT(tp1->rec.data.TSN_seq, data_list[i]->rec.data.TSN_seq)) {
6959			struct sctp_tmit_chunk *tpp;
6960
6961			/* need to move back */
6962	back_up_more:
6963			tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
6964			if (tpp == NULL) {
6965				TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
6966				goto all_done;
6967			}
6968			tp1 = tpp;
6969			if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, data_list[i]->rec.data.TSN_seq)) {
6970				goto back_up_more;
6971			}
6972			TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
6973		} else {
6974			TAILQ_INSERT_TAIL(&asoc->sent_queue,
6975			    data_list[i],
6976			    sctp_next);
6977		}
6978all_done:
6979		/* This does not lower until the cum-ack passes it */
6980		asoc->sent_queue_cnt++;
6981		if ((asoc->peers_rwnd <= 0) &&
6982		    (asoc->total_flight == 0) &&
6983		    (bundle_at == 1)) {
6984			/* Mark the chunk as being a window probe */
6985			SCTP_STAT_INCR(sctps_windowprobed);
6986		}
6987#ifdef SCTP_AUDITING_ENABLED
6988		sctp_audit_log(0xC2, 3);
6989#endif
6990		data_list[i]->sent = SCTP_DATAGRAM_SENT;
6991		data_list[i]->snd_count = 1;
6992		data_list[i]->rec.data.chunk_was_revoked = 0;
6993		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
6994			sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
6995			    data_list[i]->whoTo->flight_size,
6996			    data_list[i]->book_size,
6997			    (uintptr_t) data_list[i]->whoTo,
6998			    data_list[i]->rec.data.TSN_seq);
6999		}
7000		sctp_flight_size_increase(data_list[i]);
7001		sctp_total_flight_increase(stcb, data_list[i]);
7002		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
7003			sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
7004			    asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
7005		}
7006		asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
7007		    (uint32_t) (data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
7008		if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
7009			/* SWS sender side engages */
7010			asoc->peers_rwnd = 0;
7011		}
7012	}
7013	if (asoc->cc_functions.sctp_cwnd_update_packet_transmitted) {
7014		(*asoc->cc_functions.sctp_cwnd_update_packet_transmitted) (stcb, net);
7015	}
7016}
7017
7018static void
7019sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc, int so_locked
7020#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7021    SCTP_UNUSED
7022#endif
7023)
7024{
7025	struct sctp_tmit_chunk *chk, *nchk;
7026
7027	TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
7028		if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7029		    (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||	/* EY */
7030		    (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
7031		    (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
7032		    (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) ||
7033		    (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
7034		    (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
7035		    (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
7036		    (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
7037		    (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
7038		    (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
7039		    (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
7040			/* Stray chunks must be cleaned up */
7041	clean_up_anyway:
7042			TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
7043			if (chk->data) {
7044				sctp_m_freem(chk->data);
7045				chk->data = NULL;
7046			}
7047			asoc->ctrl_queue_cnt--;
7048			if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)
7049				asoc->fwd_tsn_cnt--;
7050			sctp_free_a_chunk(stcb, chk, so_locked);
7051		} else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
7052			/* special handling, we must look into the param */
7053			if (chk != asoc->str_reset) {
7054				goto clean_up_anyway;
7055			}
7056		}
7057	}
7058}
7059
7060
7061static int
7062sctp_can_we_split_this(struct sctp_tcb *stcb,
7063    uint32_t length,
7064    uint32_t goal_mtu, uint32_t frag_point, int eeor_on)
7065{
7066	/*
7067	 * Make a decision on if I should split a msg into multiple parts.
7068	 * This is only asked of incomplete messages.
7069	 */
7070	if (eeor_on) {
7071		/*
7072		 * If we are doing EEOR we need to always send it if its the
7073		 * entire thing, since it might be all the guy is putting in
7074		 * the hopper.
7075		 */
7076		if (goal_mtu >= length) {
7077			/*-
7078			 * If we have data outstanding,
7079			 * we get another chance when the sack
7080			 * arrives to transmit - wait for more data
7081			 */
7082			if (stcb->asoc.total_flight == 0) {
7083				/*
7084				 * If nothing is in flight, we zero the
7085				 * packet counter.
7086				 */
7087				return (length);
7088			}
7089			return (0);
7090
7091		} else {
7092			/* You can fill the rest */
7093			return (goal_mtu);
7094		}
7095	}
7096	/*-
7097	 * For those strange folk that make the send buffer
7098	 * smaller than our fragmentation point, we can't
7099	 * get a full msg in so we have to allow splitting.
7100	 */
7101	if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
7102		return (length);
7103	}
7104	if ((length <= goal_mtu) ||
7105	    ((length - goal_mtu) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
7106		/* Sub-optimial residual don't split in non-eeor mode. */
7107		return (0);
7108	}
7109	/*
7110	 * If we reach here length is larger than the goal_mtu. Do we wish
7111	 * to split it for the sake of packet putting together?
7112	 */
7113	if (goal_mtu >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
7114		/* Its ok to split it */
7115		return (min(goal_mtu, frag_point));
7116	}
7117	/* Nope, can't split */
7118	return (0);
7119
7120}
7121
7122static uint32_t
7123sctp_move_to_outqueue(struct sctp_tcb *stcb,
7124    struct sctp_stream_out *strq,
7125    uint32_t goal_mtu,
7126    uint32_t frag_point,
7127    int *locked,
7128    int *giveup,
7129    int eeor_mode,
7130    int *bail,
7131    int so_locked
7132#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7133    SCTP_UNUSED
7134#endif
7135)
7136{
7137	/* Move from the stream to the send_queue keeping track of the total */
7138	struct sctp_association *asoc;
7139	struct sctp_stream_queue_pending *sp;
7140	struct sctp_tmit_chunk *chk;
7141	struct sctp_data_chunk *dchkh;
7142	uint32_t to_move, length;
7143	uint8_t rcv_flags = 0;
7144	uint8_t some_taken;
7145	uint8_t send_lock_up = 0;
7146
7147	SCTP_TCB_LOCK_ASSERT(stcb);
7148	asoc = &stcb->asoc;
7149one_more_time:
7150	/* sa_ignore FREED_MEMORY */
7151	sp = TAILQ_FIRST(&strq->outqueue);
7152	if (sp == NULL) {
7153		*locked = 0;
7154		if (send_lock_up == 0) {
7155			SCTP_TCB_SEND_LOCK(stcb);
7156			send_lock_up = 1;
7157		}
7158		sp = TAILQ_FIRST(&strq->outqueue);
7159		if (sp) {
7160			goto one_more_time;
7161		}
7162		if (strq->last_msg_incomplete) {
7163			SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
7164			    strq->stream_no,
7165			    strq->last_msg_incomplete);
7166			strq->last_msg_incomplete = 0;
7167		}
7168		to_move = 0;
7169		if (send_lock_up) {
7170			SCTP_TCB_SEND_UNLOCK(stcb);
7171			send_lock_up = 0;
7172		}
7173		goto out_of;
7174	}
7175	if ((sp->msg_is_complete) && (sp->length == 0)) {
7176		if (sp->sender_all_done) {
7177			/*
7178			 * We are doing differed cleanup. Last time through
7179			 * when we took all the data the sender_all_done was
7180			 * not set.
7181			 */
7182			if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
7183				SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
7184				SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7185				    sp->sender_all_done,
7186				    sp->length,
7187				    sp->msg_is_complete,
7188				    sp->put_last_out,
7189				    send_lock_up);
7190			}
7191			if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
7192				SCTP_TCB_SEND_LOCK(stcb);
7193				send_lock_up = 1;
7194			}
7195			atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7196			TAILQ_REMOVE(&strq->outqueue, sp, next);
7197			stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7198			if (sp->net) {
7199				sctp_free_remote_addr(sp->net);
7200				sp->net = NULL;
7201			}
7202			if (sp->data) {
7203				sctp_m_freem(sp->data);
7204				sp->data = NULL;
7205			}
7206			sctp_free_a_strmoq(stcb, sp, so_locked);
7207			/* we can't be locked to it */
7208			*locked = 0;
7209			stcb->asoc.locked_on_sending = NULL;
7210			if (send_lock_up) {
7211				SCTP_TCB_SEND_UNLOCK(stcb);
7212				send_lock_up = 0;
7213			}
7214			/* back to get the next msg */
7215			goto one_more_time;
7216		} else {
7217			/*
7218			 * sender just finished this but still holds a
7219			 * reference
7220			 */
7221			*locked = 1;
7222			*giveup = 1;
7223			to_move = 0;
7224			goto out_of;
7225		}
7226	} else {
7227		/* is there some to get */
7228		if (sp->length == 0) {
7229			/* no */
7230			*locked = 1;
7231			*giveup = 1;
7232			to_move = 0;
7233			goto out_of;
7234		} else if (sp->discard_rest) {
7235			if (send_lock_up == 0) {
7236				SCTP_TCB_SEND_LOCK(stcb);
7237				send_lock_up = 1;
7238			}
7239			/* Whack down the size */
7240			atomic_subtract_int(&stcb->asoc.total_output_queue_size, sp->length);
7241			if ((stcb->sctp_socket != NULL) && \
7242			    ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
7243			    (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) {
7244				atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc, sp->length);
7245			}
7246			if (sp->data) {
7247				sctp_m_freem(sp->data);
7248				sp->data = NULL;
7249				sp->tail_mbuf = NULL;
7250			}
7251			sp->length = 0;
7252			sp->some_taken = 1;
7253			*locked = 1;
7254			*giveup = 1;
7255			to_move = 0;
7256			goto out_of;
7257		}
7258	}
7259	some_taken = sp->some_taken;
7260	if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
7261		sp->msg_is_complete = 1;
7262	}
7263re_look:
7264	length = sp->length;
7265	if (sp->msg_is_complete) {
7266		/* The message is complete */
7267		to_move = min(length, frag_point);
7268		if (to_move == length) {
7269			/* All of it fits in the MTU */
7270			if (sp->some_taken) {
7271				rcv_flags |= SCTP_DATA_LAST_FRAG;
7272				sp->put_last_out = 1;
7273			} else {
7274				rcv_flags |= SCTP_DATA_NOT_FRAG;
7275				sp->put_last_out = 1;
7276			}
7277		} else {
7278			/* Not all of it fits, we fragment */
7279			if (sp->some_taken == 0) {
7280				rcv_flags |= SCTP_DATA_FIRST_FRAG;
7281			}
7282			sp->some_taken = 1;
7283		}
7284	} else {
7285		to_move = sctp_can_we_split_this(stcb, length, goal_mtu, frag_point, eeor_mode);
7286		if (to_move) {
7287			/*-
7288			 * We use a snapshot of length in case it
7289			 * is expanding during the compare.
7290			 */
7291			uint32_t llen;
7292
7293			llen = length;
7294			if (to_move >= llen) {
7295				to_move = llen;
7296				if (send_lock_up == 0) {
7297					/*-
7298					 * We are taking all of an incomplete msg
7299					 * thus we need a send lock.
7300					 */
7301					SCTP_TCB_SEND_LOCK(stcb);
7302					send_lock_up = 1;
7303					if (sp->msg_is_complete) {
7304						/*
7305						 * the sender finished the
7306						 * msg
7307						 */
7308						goto re_look;
7309					}
7310				}
7311			}
7312			if (sp->some_taken == 0) {
7313				rcv_flags |= SCTP_DATA_FIRST_FRAG;
7314				sp->some_taken = 1;
7315			}
7316		} else {
7317			/* Nothing to take. */
7318			if (sp->some_taken) {
7319				*locked = 1;
7320			}
7321			*giveup = 1;
7322			to_move = 0;
7323			goto out_of;
7324		}
7325	}
7326
7327	/* If we reach here, we can copy out a chunk */
7328	sctp_alloc_a_chunk(stcb, chk);
7329	if (chk == NULL) {
7330		/* No chunk memory */
7331		*giveup = 1;
7332		to_move = 0;
7333		goto out_of;
7334	}
7335	/*
7336	 * Setup for unordered if needed by looking at the user sent info
7337	 * flags.
7338	 */
7339	if (sp->sinfo_flags & SCTP_UNORDERED) {
7340		rcv_flags |= SCTP_DATA_UNORDERED;
7341	}
7342	if ((SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) && ((sp->sinfo_flags & SCTP_EOF) == SCTP_EOF)) ||
7343	    ((sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) == SCTP_SACK_IMMEDIATELY)) {
7344		rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7345	}
7346	/* clear out the chunk before setting up */
7347	memset(chk, 0, sizeof(*chk));
7348	chk->rec.data.rcv_flags = rcv_flags;
7349
7350	if (to_move >= length) {
7351		/* we think we can steal the whole thing */
7352		if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
7353			SCTP_TCB_SEND_LOCK(stcb);
7354			send_lock_up = 1;
7355		}
7356		if (to_move < sp->length) {
7357			/* bail, it changed */
7358			goto dont_do_it;
7359		}
7360		chk->data = sp->data;
7361		chk->last_mbuf = sp->tail_mbuf;
7362		/* register the stealing */
7363		sp->data = sp->tail_mbuf = NULL;
7364	} else {
7365		struct mbuf *m;
7366
7367dont_do_it:
7368		chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_NOWAIT);
7369		chk->last_mbuf = NULL;
7370		if (chk->data == NULL) {
7371			sp->some_taken = some_taken;
7372			sctp_free_a_chunk(stcb, chk, so_locked);
7373			*bail = 1;
7374			to_move = 0;
7375			goto out_of;
7376		}
7377#ifdef SCTP_MBUF_LOGGING
7378		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
7379			struct mbuf *mat;
7380
7381			for (mat = chk->data; mat; mat = SCTP_BUF_NEXT(mat)) {
7382				if (SCTP_BUF_IS_EXTENDED(mat)) {
7383					sctp_log_mb(mat, SCTP_MBUF_ICOPY);
7384				}
7385			}
7386		}
7387#endif
7388		/* Pull off the data */
7389		m_adj(sp->data, to_move);
7390		/* Now lets work our way down and compact it */
7391		m = sp->data;
7392		while (m && (SCTP_BUF_LEN(m) == 0)) {
7393			sp->data = SCTP_BUF_NEXT(m);
7394			SCTP_BUF_NEXT(m) = NULL;
7395			if (sp->tail_mbuf == m) {
7396				/*-
7397				 * Freeing tail? TSNH since
7398				 * we supposedly were taking less
7399				 * than the sp->length.
7400				 */
7401#ifdef INVARIANTS
7402				panic("Huh, freing tail? - TSNH");
7403#else
7404				SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
7405				sp->tail_mbuf = sp->data = NULL;
7406				sp->length = 0;
7407#endif
7408
7409			}
7410			sctp_m_free(m);
7411			m = sp->data;
7412		}
7413	}
7414	if (SCTP_BUF_IS_EXTENDED(chk->data)) {
7415		chk->copy_by_ref = 1;
7416	} else {
7417		chk->copy_by_ref = 0;
7418	}
7419	/*
7420	 * get last_mbuf and counts of mb useage This is ugly but hopefully
7421	 * its only one mbuf.
7422	 */
7423	if (chk->last_mbuf == NULL) {
7424		chk->last_mbuf = chk->data;
7425		while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
7426			chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
7427		}
7428	}
7429	if (to_move > length) {
7430		/*- This should not happen either
7431		 * since we always lower to_move to the size
7432		 * of sp->length if its larger.
7433		 */
7434#ifdef INVARIANTS
7435		panic("Huh, how can to_move be larger?");
7436#else
7437		SCTP_PRINTF("Huh, how can to_move be larger?\n");
7438		sp->length = 0;
7439#endif
7440	} else {
7441		atomic_subtract_int(&sp->length, to_move);
7442	}
7443	if (M_LEADINGSPACE(chk->data) < (int)sizeof(struct sctp_data_chunk)) {
7444		/* Not enough room for a chunk header, get some */
7445		struct mbuf *m;
7446
7447		m = sctp_get_mbuf_for_msg(1, 0, M_NOWAIT, 0, MT_DATA);
7448		if (m == NULL) {
7449			/*
7450			 * we're in trouble here. _PREPEND below will free
7451			 * all the data if there is no leading space, so we
7452			 * must put the data back and restore.
7453			 */
7454			if (send_lock_up == 0) {
7455				SCTP_TCB_SEND_LOCK(stcb);
7456				send_lock_up = 1;
7457			}
7458			if (chk->data == NULL) {
7459				/* unsteal the data */
7460				sp->data = chk->data;
7461				sp->tail_mbuf = chk->last_mbuf;
7462			} else {
7463				struct mbuf *m_tmp;
7464
7465				/* reassemble the data */
7466				m_tmp = sp->data;
7467				sp->data = chk->data;
7468				SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
7469			}
7470			sp->some_taken = some_taken;
7471			atomic_add_int(&sp->length, to_move);
7472			chk->data = NULL;
7473			*bail = 1;
7474			sctp_free_a_chunk(stcb, chk, so_locked);
7475			to_move = 0;
7476			goto out_of;
7477		} else {
7478			SCTP_BUF_LEN(m) = 0;
7479			SCTP_BUF_NEXT(m) = chk->data;
7480			chk->data = m;
7481			M_ALIGN(chk->data, 4);
7482		}
7483	}
7484	SCTP_BUF_PREPEND(chk->data, sizeof(struct sctp_data_chunk), M_NOWAIT);
7485	if (chk->data == NULL) {
7486		/* HELP, TSNH since we assured it would not above? */
7487#ifdef INVARIANTS
7488		panic("prepend failes HELP?");
7489#else
7490		SCTP_PRINTF("prepend fails HELP?\n");
7491		sctp_free_a_chunk(stcb, chk, so_locked);
7492#endif
7493		*bail = 1;
7494		to_move = 0;
7495		goto out_of;
7496	}
7497	sctp_snd_sb_alloc(stcb, sizeof(struct sctp_data_chunk));
7498	chk->book_size = chk->send_size = (to_move + sizeof(struct sctp_data_chunk));
7499	chk->book_size_scale = 0;
7500	chk->sent = SCTP_DATAGRAM_UNSENT;
7501
7502	chk->flags = 0;
7503	chk->asoc = &stcb->asoc;
7504	chk->pad_inplace = 0;
7505	chk->no_fr_allowed = 0;
7506	chk->rec.data.stream_seq = strq->next_sequence_send;
7507	if ((rcv_flags & SCTP_DATA_LAST_FRAG) &&
7508	    !(rcv_flags & SCTP_DATA_UNORDERED)) {
7509		strq->next_sequence_send++;
7510	}
7511	chk->rec.data.stream_number = sp->stream;
7512	chk->rec.data.payloadtype = sp->ppid;
7513	chk->rec.data.context = sp->context;
7514	chk->rec.data.doing_fast_retransmit = 0;
7515
7516	chk->rec.data.timetodrop = sp->ts;
7517	chk->flags = sp->act_flags;
7518
7519	if (sp->net) {
7520		chk->whoTo = sp->net;
7521		atomic_add_int(&chk->whoTo->ref_count, 1);
7522	} else
7523		chk->whoTo = NULL;
7524
7525	if (sp->holds_key_ref) {
7526		chk->auth_keyid = sp->auth_keyid;
7527		sctp_auth_key_acquire(stcb, chk->auth_keyid);
7528		chk->holds_key_ref = 1;
7529	}
7530	chk->rec.data.TSN_seq = atomic_fetchadd_int(&asoc->sending_seq, 1);
7531	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
7532		sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
7533		    (uintptr_t) stcb, sp->length,
7534		    (uint32_t) ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq),
7535		    chk->rec.data.TSN_seq);
7536	}
7537	dchkh = mtod(chk->data, struct sctp_data_chunk *);
7538	/*
7539	 * Put the rest of the things in place now. Size was done earlier in
7540	 * previous loop prior to padding.
7541	 */
7542
7543#ifdef SCTP_ASOCLOG_OF_TSNS
7544	SCTP_TCB_LOCK_ASSERT(stcb);
7545	if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
7546		asoc->tsn_out_at = 0;
7547		asoc->tsn_out_wrapped = 1;
7548	}
7549	asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.TSN_seq;
7550	asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.stream_number;
7551	asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.stream_seq;
7552	asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
7553	asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
7554	asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
7555	asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
7556	asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
7557	asoc->tsn_out_at++;
7558#endif
7559
7560	dchkh->ch.chunk_type = SCTP_DATA;
7561	dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7562	dchkh->dp.tsn = htonl(chk->rec.data.TSN_seq);
7563	dchkh->dp.stream_id = htons(strq->stream_no);
7564	dchkh->dp.stream_sequence = htons(chk->rec.data.stream_seq);
7565	dchkh->dp.protocol_id = chk->rec.data.payloadtype;
7566	dchkh->ch.chunk_length = htons(chk->send_size);
7567	/* Now advance the chk->send_size by the actual pad needed. */
7568	if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
7569		/* need a pad */
7570		struct mbuf *lm;
7571		int pads;
7572
7573		pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
7574		lm = sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf);
7575		if (lm != NULL) {
7576			chk->last_mbuf = lm;
7577			chk->pad_inplace = 1;
7578		}
7579		chk->send_size += pads;
7580	}
7581	if (PR_SCTP_ENABLED(chk->flags)) {
7582		asoc->pr_sctp_cnt++;
7583	}
7584	if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
7585		/* All done pull and kill the message */
7586		atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7587		if (sp->put_last_out == 0) {
7588			SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
7589			SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7590			    sp->sender_all_done,
7591			    sp->length,
7592			    sp->msg_is_complete,
7593			    sp->put_last_out,
7594			    send_lock_up);
7595		}
7596		if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
7597			SCTP_TCB_SEND_LOCK(stcb);
7598			send_lock_up = 1;
7599		}
7600		TAILQ_REMOVE(&strq->outqueue, sp, next);
7601		stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7602		if (sp->net) {
7603			sctp_free_remote_addr(sp->net);
7604			sp->net = NULL;
7605		}
7606		if (sp->data) {
7607			sctp_m_freem(sp->data);
7608			sp->data = NULL;
7609		}
7610		sctp_free_a_strmoq(stcb, sp, so_locked);
7611
7612		/* we can't be locked to it */
7613		*locked = 0;
7614		stcb->asoc.locked_on_sending = NULL;
7615	} else {
7616		/* more to go, we are locked */
7617		*locked = 1;
7618	}
7619	asoc->chunks_on_out_queue++;
7620	strq->chunks_on_queues++;
7621	TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
7622	asoc->send_queue_cnt++;
7623out_of:
7624	if (send_lock_up) {
7625		SCTP_TCB_SEND_UNLOCK(stcb);
7626	}
7627	return (to_move);
7628}
7629
7630
7631static void
7632sctp_fill_outqueue(struct sctp_tcb *stcb,
7633    struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now, int so_locked
7634#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7635    SCTP_UNUSED
7636#endif
7637)
7638{
7639	struct sctp_association *asoc;
7640	struct sctp_stream_out *strq;
7641	int goal_mtu, moved_how_much, total_moved = 0, bail = 0;
7642	int locked, giveup;
7643
7644	SCTP_TCB_LOCK_ASSERT(stcb);
7645	asoc = &stcb->asoc;
7646	switch (net->ro._l_addr.sa.sa_family) {
7647#ifdef INET
7648	case AF_INET:
7649		goal_mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
7650		break;
7651#endif
7652#ifdef INET6
7653	case AF_INET6:
7654		goal_mtu = net->mtu - SCTP_MIN_OVERHEAD;
7655		break;
7656#endif
7657	default:
7658		/* TSNH */
7659		goal_mtu = net->mtu;
7660		break;
7661	}
7662	/* Need an allowance for the data chunk header too */
7663	goal_mtu -= sizeof(struct sctp_data_chunk);
7664
7665	/* must make even word boundary */
7666	goal_mtu &= 0xfffffffc;
7667	if (asoc->locked_on_sending) {
7668		/* We are stuck on one stream until the message completes. */
7669		strq = asoc->locked_on_sending;
7670		locked = 1;
7671	} else {
7672		strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7673		locked = 0;
7674	}
7675	while ((goal_mtu > 0) && strq) {
7676		giveup = 0;
7677		bail = 0;
7678		moved_how_much = sctp_move_to_outqueue(stcb, strq, goal_mtu, frag_point, &locked,
7679		    &giveup, eeor_mode, &bail, so_locked);
7680		if (moved_how_much)
7681			stcb->asoc.ss_functions.sctp_ss_scheduled(stcb, net, asoc, strq, moved_how_much);
7682
7683		if (locked) {
7684			asoc->locked_on_sending = strq;
7685			if ((moved_how_much == 0) || (giveup) || bail)
7686				/* no more to move for now */
7687				break;
7688		} else {
7689			asoc->locked_on_sending = NULL;
7690			if ((giveup) || bail) {
7691				break;
7692			}
7693			strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7694			if (strq == NULL) {
7695				break;
7696			}
7697		}
7698		total_moved += moved_how_much;
7699		goal_mtu -= (moved_how_much + sizeof(struct sctp_data_chunk));
7700		goal_mtu &= 0xfffffffc;
7701	}
7702	if (bail)
7703		*quit_now = 1;
7704
7705	stcb->asoc.ss_functions.sctp_ss_packet_done(stcb, net, asoc);
7706
7707	if (total_moved == 0) {
7708		if ((stcb->asoc.sctp_cmt_on_off == 0) &&
7709		    (net == stcb->asoc.primary_destination)) {
7710			/* ran dry for primary network net */
7711			SCTP_STAT_INCR(sctps_primary_randry);
7712		} else if (stcb->asoc.sctp_cmt_on_off > 0) {
7713			/* ran dry with CMT on */
7714			SCTP_STAT_INCR(sctps_cmt_randry);
7715		}
7716	}
7717}
7718
7719void
7720sctp_fix_ecn_echo(struct sctp_association *asoc)
7721{
7722	struct sctp_tmit_chunk *chk;
7723
7724	TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7725		if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7726			chk->sent = SCTP_DATAGRAM_UNSENT;
7727		}
7728	}
7729}
7730
7731void
7732sctp_move_chunks_from_net(struct sctp_tcb *stcb, struct sctp_nets *net)
7733{
7734	struct sctp_association *asoc;
7735	struct sctp_tmit_chunk *chk;
7736	struct sctp_stream_queue_pending *sp;
7737	unsigned int i;
7738
7739	if (net == NULL) {
7740		return;
7741	}
7742	asoc = &stcb->asoc;
7743	for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
7744		TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
7745			if (sp->net == net) {
7746				sctp_free_remote_addr(sp->net);
7747				sp->net = NULL;
7748			}
7749		}
7750	}
7751	TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7752		if (chk->whoTo == net) {
7753			sctp_free_remote_addr(chk->whoTo);
7754			chk->whoTo = NULL;
7755		}
7756	}
7757}
7758
7759int
7760sctp_med_chunk_output(struct sctp_inpcb *inp,
7761    struct sctp_tcb *stcb,
7762    struct sctp_association *asoc,
7763    int *num_out,
7764    int *reason_code,
7765    int control_only, int from_where,
7766    struct timeval *now, int *now_filled, int frag_point, int so_locked
7767#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7768    SCTP_UNUSED
7769#endif
7770)
7771{
7772	/**
7773	 * Ok this is the generic chunk service queue. we must do the
7774	 * following: - Service the stream queue that is next, moving any
7775	 * message (note I must get a complete message i.e. FIRST/MIDDLE and
7776	 * LAST to the out queue in one pass) and assigning TSN's - Check to
7777	 * see if the cwnd/rwnd allows any output, if so we go ahead and
7778	 * fomulate and send the low level chunks. Making sure to combine
7779	 * any control in the control chunk queue also.
7780	 */
7781	struct sctp_nets *net, *start_at, *sack_goes_to = NULL, *old_start_at = NULL;
7782	struct mbuf *outchain, *endoutchain;
7783	struct sctp_tmit_chunk *chk, *nchk;
7784
7785	/* temp arrays for unlinking */
7786	struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
7787	int no_fragmentflg, error;
7788	unsigned int max_rwnd_per_dest, max_send_per_dest;
7789	int one_chunk, hbflag, skip_data_for_this_net;
7790	int asconf, cookie, no_out_cnt;
7791	int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
7792	unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
7793	int tsns_sent = 0;
7794	uint32_t auth_offset = 0;
7795	struct sctp_auth_chunk *auth = NULL;
7796	uint16_t auth_keyid;
7797	int override_ok = 1;
7798	int skip_fill_up = 0;
7799	int data_auth_reqd = 0;
7800
7801	/*
7802	 * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
7803	 * destination.
7804	 */
7805	int quit_now = 0;
7806
7807	*num_out = 0;
7808	auth_keyid = stcb->asoc.authinfo.active_keyid;
7809
7810	if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
7811	    (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED) ||
7812	    (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
7813		eeor_mode = 1;
7814	} else {
7815		eeor_mode = 0;
7816	}
7817	ctl_cnt = no_out_cnt = asconf = cookie = 0;
7818	/*
7819	 * First lets prime the pump. For each destination, if there is room
7820	 * in the flight size, attempt to pull an MTU's worth out of the
7821	 * stream queues into the general send_queue
7822	 */
7823#ifdef SCTP_AUDITING_ENABLED
7824	sctp_audit_log(0xC2, 2);
7825#endif
7826	SCTP_TCB_LOCK_ASSERT(stcb);
7827	hbflag = 0;
7828	if ((control_only) || (asoc->stream_reset_outstanding))
7829		no_data_chunks = 1;
7830	else
7831		no_data_chunks = 0;
7832
7833	/* Nothing to possible to send? */
7834	if ((TAILQ_EMPTY(&asoc->control_send_queue) ||
7835	    (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) &&
7836	    TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7837	    TAILQ_EMPTY(&asoc->send_queue) &&
7838	    stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
7839nothing_to_send:
7840		*reason_code = 9;
7841		return (0);
7842	}
7843	if (asoc->peers_rwnd == 0) {
7844		/* No room in peers rwnd */
7845		*reason_code = 1;
7846		if (asoc->total_flight > 0) {
7847			/* we are allowed one chunk in flight */
7848			no_data_chunks = 1;
7849		}
7850	}
7851	if (stcb->asoc.ecn_echo_cnt_onq) {
7852		/* Record where a sack goes, if any */
7853		if (no_data_chunks &&
7854		    (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) {
7855			/* Nothing but ECNe to send - we don't do that */
7856			goto nothing_to_send;
7857		}
7858		TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7859			if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7860			    (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
7861				sack_goes_to = chk->whoTo;
7862				break;
7863			}
7864		}
7865	}
7866	max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
7867	if (stcb->sctp_socket)
7868		max_send_per_dest = SCTP_SB_LIMIT_SND(stcb->sctp_socket) / asoc->numnets;
7869	else
7870		max_send_per_dest = 0;
7871	if (no_data_chunks == 0) {
7872		/* How many non-directed chunks are there? */
7873		TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7874			if (chk->whoTo == NULL) {
7875				/*
7876				 * We already have non-directed chunks on
7877				 * the queue, no need to do a fill-up.
7878				 */
7879				skip_fill_up = 1;
7880				break;
7881			}
7882		}
7883
7884	}
7885	if ((no_data_chunks == 0) &&
7886	    (skip_fill_up == 0) &&
7887	    (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc))) {
7888		TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
7889			/*
7890			 * This for loop we are in takes in each net, if
7891			 * its's got space in cwnd and has data sent to it
7892			 * (when CMT is off) then it calls
7893			 * sctp_fill_outqueue for the net. This gets data on
7894			 * the send queue for that network.
7895			 *
7896			 * In sctp_fill_outqueue TSN's are assigned and data is
7897			 * copied out of the stream buffers. Note mostly
7898			 * copy by reference (we hope).
7899			 */
7900			net->window_probe = 0;
7901			if ((net != stcb->asoc.alternate) &&
7902			    ((net->dest_state & SCTP_ADDR_PF) ||
7903			    (!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
7904			    (net->dest_state & SCTP_ADDR_UNCONFIRMED))) {
7905				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7906					sctp_log_cwnd(stcb, net, 1,
7907					    SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7908				}
7909				continue;
7910			}
7911			if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
7912			    (net->flight_size == 0)) {
7913				(*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
7914			}
7915			if (net->flight_size >= net->cwnd) {
7916				/* skip this network, no room - can't fill */
7917				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7918					sctp_log_cwnd(stcb, net, 3,
7919					    SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7920				}
7921				continue;
7922			}
7923			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7924				sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7925			}
7926			sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now, so_locked);
7927			if (quit_now) {
7928				/* memory alloc failure */
7929				no_data_chunks = 1;
7930				break;
7931			}
7932		}
7933	}
7934	/* now service each destination and send out what we can for it */
7935	/* Nothing to send? */
7936	if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7937	    TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7938	    TAILQ_EMPTY(&asoc->send_queue)) {
7939		*reason_code = 8;
7940		return (0);
7941	}
7942	if (asoc->sctp_cmt_on_off > 0) {
7943		/* get the last start point */
7944		start_at = asoc->last_net_cmt_send_started;
7945		if (start_at == NULL) {
7946			/* null so to beginning */
7947			start_at = TAILQ_FIRST(&asoc->nets);
7948		} else {
7949			start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
7950			if (start_at == NULL) {
7951				start_at = TAILQ_FIRST(&asoc->nets);
7952			}
7953		}
7954		asoc->last_net_cmt_send_started = start_at;
7955	} else {
7956		start_at = TAILQ_FIRST(&asoc->nets);
7957	}
7958	TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7959		if (chk->whoTo == NULL) {
7960			if (asoc->alternate) {
7961				chk->whoTo = asoc->alternate;
7962			} else {
7963				chk->whoTo = asoc->primary_destination;
7964			}
7965			atomic_add_int(&chk->whoTo->ref_count, 1);
7966		}
7967	}
7968	old_start_at = NULL;
7969again_one_more_time:
7970	for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
7971		/* how much can we send? */
7972		/* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
7973		if (old_start_at && (old_start_at == net)) {
7974			/* through list ocmpletely. */
7975			break;
7976		}
7977		tsns_sent = 0xa;
7978		if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7979		    TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7980		    (net->flight_size >= net->cwnd)) {
7981			/*
7982			 * Nothing on control or asconf and flight is full,
7983			 * we can skip even in the CMT case.
7984			 */
7985			continue;
7986		}
7987		bundle_at = 0;
7988		endoutchain = outchain = NULL;
7989		no_fragmentflg = 1;
7990		one_chunk = 0;
7991		if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
7992			skip_data_for_this_net = 1;
7993		} else {
7994			skip_data_for_this_net = 0;
7995		}
7996		if ((net->ro.ro_rt) && (net->ro.ro_rt->rt_ifp)) {
7997			/*
7998			 * if we have a route and an ifp check to see if we
7999			 * have room to send to this guy
8000			 */
8001			struct ifnet *ifp;
8002
8003			ifp = net->ro.ro_rt->rt_ifp;
8004			if ((ifp->if_snd.ifq_len + 2) >= ifp->if_snd.ifq_maxlen) {
8005				SCTP_STAT_INCR(sctps_ifnomemqueued);
8006				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
8007					sctp_log_maxburst(stcb, net, ifp->if_snd.ifq_len, ifp->if_snd.ifq_maxlen, SCTP_MAX_IFP_APPLIED);
8008				}
8009				continue;
8010			}
8011		}
8012		switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8013#ifdef INET
8014		case AF_INET:
8015			mtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
8016			break;
8017#endif
8018#ifdef INET6
8019		case AF_INET6:
8020			mtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
8021			break;
8022#endif
8023		default:
8024			/* TSNH */
8025			mtu = net->mtu;
8026			break;
8027		}
8028		mx_mtu = mtu;
8029		to_out = 0;
8030		if (mtu > asoc->peers_rwnd) {
8031			if (asoc->total_flight > 0) {
8032				/* We have a packet in flight somewhere */
8033				r_mtu = asoc->peers_rwnd;
8034			} else {
8035				/* We are always allowed to send one MTU out */
8036				one_chunk = 1;
8037				r_mtu = mtu;
8038			}
8039		} else {
8040			r_mtu = mtu;
8041		}
8042		/************************/
8043		/* ASCONF transmission */
8044		/************************/
8045		/* Now first lets go through the asconf queue */
8046		TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
8047			if (chk->rec.chunk_id.id != SCTP_ASCONF) {
8048				continue;
8049			}
8050			if (chk->whoTo == NULL) {
8051				if (asoc->alternate == NULL) {
8052					if (asoc->primary_destination != net) {
8053						break;
8054					}
8055				} else {
8056					if (asoc->alternate != net) {
8057						break;
8058					}
8059				}
8060			} else {
8061				if (chk->whoTo != net) {
8062					break;
8063				}
8064			}
8065			if (chk->data == NULL) {
8066				break;
8067			}
8068			if (chk->sent != SCTP_DATAGRAM_UNSENT &&
8069			    chk->sent != SCTP_DATAGRAM_RESEND) {
8070				break;
8071			}
8072			/*
8073			 * if no AUTH is yet included and this chunk
8074			 * requires it, make sure to account for it.  We
8075			 * don't apply the size until the AUTH chunk is
8076			 * actually added below in case there is no room for
8077			 * this chunk. NOTE: we overload the use of "omtu"
8078			 * here
8079			 */
8080			if ((auth == NULL) &&
8081			    sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8082			    stcb->asoc.peer_auth_chunks)) {
8083				omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8084			} else
8085				omtu = 0;
8086			/* Here we do NOT factor the r_mtu */
8087			if ((chk->send_size < (int)(mtu - omtu)) ||
8088			    (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8089				/*
8090				 * We probably should glom the mbuf chain
8091				 * from the chk->data for control but the
8092				 * problem is it becomes yet one more level
8093				 * of tracking to do if for some reason
8094				 * output fails. Then I have got to
8095				 * reconstruct the merged control chain.. el
8096				 * yucko.. for now we take the easy way and
8097				 * do the copy
8098				 */
8099				/*
8100				 * Add an AUTH chunk, if chunk requires it
8101				 * save the offset into the chain for AUTH
8102				 */
8103				if ((auth == NULL) &&
8104				    (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8105				    stcb->asoc.peer_auth_chunks))) {
8106					outchain = sctp_add_auth_chunk(outchain,
8107					    &endoutchain,
8108					    &auth,
8109					    &auth_offset,
8110					    stcb,
8111					    chk->rec.chunk_id.id);
8112					SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8113				}
8114				outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8115				    (int)chk->rec.chunk_id.can_take_data,
8116				    chk->send_size, chk->copy_by_ref);
8117				if (outchain == NULL) {
8118					*reason_code = 8;
8119					SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8120					return (ENOMEM);
8121				}
8122				SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8123				/* update our MTU size */
8124				if (mtu > (chk->send_size + omtu))
8125					mtu -= (chk->send_size + omtu);
8126				else
8127					mtu = 0;
8128				to_out += (chk->send_size + omtu);
8129				/* Do clear IP_DF ? */
8130				if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8131					no_fragmentflg = 0;
8132				}
8133				if (chk->rec.chunk_id.can_take_data)
8134					chk->data = NULL;
8135				/*
8136				 * set hb flag since we can use these for
8137				 * RTO
8138				 */
8139				hbflag = 1;
8140				asconf = 1;
8141				/*
8142				 * should sysctl this: don't bundle data
8143				 * with ASCONF since it requires AUTH
8144				 */
8145				no_data_chunks = 1;
8146				chk->sent = SCTP_DATAGRAM_SENT;
8147				if (chk->whoTo == NULL) {
8148					chk->whoTo = net;
8149					atomic_add_int(&net->ref_count, 1);
8150				}
8151				chk->snd_count++;
8152				if (mtu == 0) {
8153					/*
8154					 * Ok we are out of room but we can
8155					 * output without effecting the
8156					 * flight size since this little guy
8157					 * is a control only packet.
8158					 */
8159					sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8160					/*
8161					 * do NOT clear the asconf flag as
8162					 * it is used to do appropriate
8163					 * source address selection.
8164					 */
8165					if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8166					    (struct sockaddr *)&net->ro._l_addr,
8167					    outchain, auth_offset, auth,
8168					    stcb->asoc.authinfo.active_keyid,
8169					    no_fragmentflg, 0, asconf,
8170					    inp->sctp_lport, stcb->rport,
8171					    htonl(stcb->asoc.peer_vtag),
8172					    net->port, NULL,
8173					    0, 0,
8174					    so_locked))) {
8175						if (error == ENOBUFS) {
8176							asoc->ifp_had_enobuf = 1;
8177							SCTP_STAT_INCR(sctps_lowlevelerr);
8178						}
8179						if (from_where == 0) {
8180							SCTP_STAT_INCR(sctps_lowlevelerrusr);
8181						}
8182						if (*now_filled == 0) {
8183							(void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8184							*now_filled = 1;
8185							*now = net->last_sent_time;
8186						} else {
8187							net->last_sent_time = *now;
8188						}
8189						hbflag = 0;
8190						/* error, could not output */
8191						if (error == EHOSTUNREACH) {
8192							/*
8193							 * Destination went
8194							 * unreachable
8195							 * during this send
8196							 */
8197							sctp_move_chunks_from_net(stcb, net);
8198						}
8199						*reason_code = 7;
8200						continue;
8201					} else
8202						asoc->ifp_had_enobuf = 0;
8203					if (*now_filled == 0) {
8204						(void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8205						*now_filled = 1;
8206						*now = net->last_sent_time;
8207					} else {
8208						net->last_sent_time = *now;
8209					}
8210					hbflag = 0;
8211					/*
8212					 * increase the number we sent, if a
8213					 * cookie is sent we don't tell them
8214					 * any was sent out.
8215					 */
8216					outchain = endoutchain = NULL;
8217					auth = NULL;
8218					auth_offset = 0;
8219					if (!no_out_cnt)
8220						*num_out += ctl_cnt;
8221					/* recalc a clean slate and setup */
8222					switch (net->ro._l_addr.sa.sa_family) {
8223#ifdef INET
8224					case AF_INET:
8225						mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8226						break;
8227#endif
8228#ifdef INET6
8229					case AF_INET6:
8230						mtu = net->mtu - SCTP_MIN_OVERHEAD;
8231						break;
8232#endif
8233					default:
8234						/* TSNH */
8235						mtu = net->mtu;
8236						break;
8237					}
8238					to_out = 0;
8239					no_fragmentflg = 1;
8240				}
8241			}
8242		}
8243		/************************/
8244		/* Control transmission */
8245		/************************/
8246		/* Now first lets go through the control queue */
8247		TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
8248			if ((sack_goes_to) &&
8249			    (chk->rec.chunk_id.id == SCTP_ECN_ECHO) &&
8250			    (chk->whoTo != sack_goes_to)) {
8251				/*
8252				 * if we have a sack in queue, and we are
8253				 * looking at an ecn echo that is NOT queued
8254				 * to where the sack is going..
8255				 */
8256				if (chk->whoTo == net) {
8257					/*
8258					 * Don't transmit it to where its
8259					 * going (current net)
8260					 */
8261					continue;
8262				} else if (sack_goes_to == net) {
8263					/*
8264					 * But do transmit it to this
8265					 * address
8266					 */
8267					goto skip_net_check;
8268				}
8269			}
8270			if (chk->whoTo == NULL) {
8271				if (asoc->alternate == NULL) {
8272					if (asoc->primary_destination != net) {
8273						continue;
8274					}
8275				} else {
8276					if (asoc->alternate != net) {
8277						continue;
8278					}
8279				}
8280			} else {
8281				if (chk->whoTo != net) {
8282					continue;
8283				}
8284			}
8285	skip_net_check:
8286			if (chk->data == NULL) {
8287				continue;
8288			}
8289			if (chk->sent != SCTP_DATAGRAM_UNSENT) {
8290				/*
8291				 * It must be unsent. Cookies and ASCONF's
8292				 * hang around but there timers will force
8293				 * when marked for resend.
8294				 */
8295				continue;
8296			}
8297			/*
8298			 * if no AUTH is yet included and this chunk
8299			 * requires it, make sure to account for it.  We
8300			 * don't apply the size until the AUTH chunk is
8301			 * actually added below in case there is no room for
8302			 * this chunk. NOTE: we overload the use of "omtu"
8303			 * here
8304			 */
8305			if ((auth == NULL) &&
8306			    sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8307			    stcb->asoc.peer_auth_chunks)) {
8308				omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8309			} else
8310				omtu = 0;
8311			/* Here we do NOT factor the r_mtu */
8312			if ((chk->send_size <= (int)(mtu - omtu)) ||
8313			    (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8314				/*
8315				 * We probably should glom the mbuf chain
8316				 * from the chk->data for control but the
8317				 * problem is it becomes yet one more level
8318				 * of tracking to do if for some reason
8319				 * output fails. Then I have got to
8320				 * reconstruct the merged control chain.. el
8321				 * yucko.. for now we take the easy way and
8322				 * do the copy
8323				 */
8324				/*
8325				 * Add an AUTH chunk, if chunk requires it
8326				 * save the offset into the chain for AUTH
8327				 */
8328				if ((auth == NULL) &&
8329				    (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8330				    stcb->asoc.peer_auth_chunks))) {
8331					outchain = sctp_add_auth_chunk(outchain,
8332					    &endoutchain,
8333					    &auth,
8334					    &auth_offset,
8335					    stcb,
8336					    chk->rec.chunk_id.id);
8337					SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8338				}
8339				outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8340				    (int)chk->rec.chunk_id.can_take_data,
8341				    chk->send_size, chk->copy_by_ref);
8342				if (outchain == NULL) {
8343					*reason_code = 8;
8344					SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8345					return (ENOMEM);
8346				}
8347				SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8348				/* update our MTU size */
8349				if (mtu > (chk->send_size + omtu))
8350					mtu -= (chk->send_size + omtu);
8351				else
8352					mtu = 0;
8353				to_out += (chk->send_size + omtu);
8354				/* Do clear IP_DF ? */
8355				if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8356					no_fragmentflg = 0;
8357				}
8358				if (chk->rec.chunk_id.can_take_data)
8359					chk->data = NULL;
8360				/* Mark things to be removed, if needed */
8361				if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8362				    (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||	/* EY */
8363				    (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
8364				    (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
8365				    (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
8366				    (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
8367				    (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
8368				    (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
8369				    (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
8370				    (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
8371				    (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
8372					if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
8373						hbflag = 1;
8374					}
8375					/* remove these chunks at the end */
8376					if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8377					    (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
8378						/* turn off the timer */
8379						if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
8380							sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
8381							    inp, stcb, net, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
8382						}
8383					}
8384					ctl_cnt++;
8385				} else {
8386					/*
8387					 * Other chunks, since they have
8388					 * timers running (i.e. COOKIE) we
8389					 * just "trust" that it gets sent or
8390					 * retransmitted.
8391					 */
8392					ctl_cnt++;
8393					if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
8394						cookie = 1;
8395						no_out_cnt = 1;
8396					} else if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
8397						/*
8398						 * Increment ecne send count
8399						 * here this means we may be
8400						 * over-zealous in our
8401						 * counting if the send
8402						 * fails, but its the best
8403						 * place to do it (we used
8404						 * to do it in the queue of
8405						 * the chunk, but that did
8406						 * not tell how many times
8407						 * it was sent.
8408						 */
8409						SCTP_STAT_INCR(sctps_sendecne);
8410					}
8411					chk->sent = SCTP_DATAGRAM_SENT;
8412					if (chk->whoTo == NULL) {
8413						chk->whoTo = net;
8414						atomic_add_int(&net->ref_count, 1);
8415					}
8416					chk->snd_count++;
8417				}
8418				if (mtu == 0) {
8419					/*
8420					 * Ok we are out of room but we can
8421					 * output without effecting the
8422					 * flight size since this little guy
8423					 * is a control only packet.
8424					 */
8425					if (asconf) {
8426						sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8427						/*
8428						 * do NOT clear the asconf
8429						 * flag as it is used to do
8430						 * appropriate source
8431						 * address selection.
8432						 */
8433					}
8434					if (cookie) {
8435						sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8436						cookie = 0;
8437					}
8438					if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8439					    (struct sockaddr *)&net->ro._l_addr,
8440					    outchain,
8441					    auth_offset, auth,
8442					    stcb->asoc.authinfo.active_keyid,
8443					    no_fragmentflg, 0, asconf,
8444					    inp->sctp_lport, stcb->rport,
8445					    htonl(stcb->asoc.peer_vtag),
8446					    net->port, NULL,
8447					    0, 0,
8448					    so_locked))) {
8449						if (error == ENOBUFS) {
8450							asoc->ifp_had_enobuf = 1;
8451							SCTP_STAT_INCR(sctps_lowlevelerr);
8452						}
8453						if (from_where == 0) {
8454							SCTP_STAT_INCR(sctps_lowlevelerrusr);
8455						}
8456						/* error, could not output */
8457						if (hbflag) {
8458							if (*now_filled == 0) {
8459								(void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8460								*now_filled = 1;
8461								*now = net->last_sent_time;
8462							} else {
8463								net->last_sent_time = *now;
8464							}
8465							hbflag = 0;
8466						}
8467						if (error == EHOSTUNREACH) {
8468							/*
8469							 * Destination went
8470							 * unreachable
8471							 * during this send
8472							 */
8473							sctp_move_chunks_from_net(stcb, net);
8474						}
8475						*reason_code = 7;
8476						continue;
8477					} else
8478						asoc->ifp_had_enobuf = 0;
8479					/* Only HB or ASCONF advances time */
8480					if (hbflag) {
8481						if (*now_filled == 0) {
8482							(void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8483							*now_filled = 1;
8484							*now = net->last_sent_time;
8485						} else {
8486							net->last_sent_time = *now;
8487						}
8488						hbflag = 0;
8489					}
8490					/*
8491					 * increase the number we sent, if a
8492					 * cookie is sent we don't tell them
8493					 * any was sent out.
8494					 */
8495					outchain = endoutchain = NULL;
8496					auth = NULL;
8497					auth_offset = 0;
8498					if (!no_out_cnt)
8499						*num_out += ctl_cnt;
8500					/* recalc a clean slate and setup */
8501					switch (net->ro._l_addr.sa.sa_family) {
8502#ifdef INET
8503					case AF_INET:
8504						mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8505						break;
8506#endif
8507#ifdef INET6
8508					case AF_INET6:
8509						mtu = net->mtu - SCTP_MIN_OVERHEAD;
8510						break;
8511#endif
8512					default:
8513						/* TSNH */
8514						mtu = net->mtu;
8515						break;
8516					}
8517					to_out = 0;
8518					no_fragmentflg = 1;
8519				}
8520			}
8521		}
8522		/* JRI: if dest is in PF state, do not send data to it */
8523		if ((asoc->sctp_cmt_on_off > 0) &&
8524		    (net != stcb->asoc.alternate) &&
8525		    (net->dest_state & SCTP_ADDR_PF)) {
8526			goto no_data_fill;
8527		}
8528		if (net->flight_size >= net->cwnd) {
8529			goto no_data_fill;
8530		}
8531		if ((asoc->sctp_cmt_on_off > 0) &&
8532		    (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_RECV_BUFFER_SPLITTING) &&
8533		    (net->flight_size > max_rwnd_per_dest)) {
8534			goto no_data_fill;
8535		}
8536		/*
8537		 * We need a specific accounting for the usage of the send
8538		 * buffer. We also need to check the number of messages per
8539		 * net. For now, this is better than nothing and it disabled
8540		 * by default...
8541		 */
8542		if ((asoc->sctp_cmt_on_off > 0) &&
8543		    (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_SEND_BUFFER_SPLITTING) &&
8544		    (max_send_per_dest > 0) &&
8545		    (net->flight_size > max_send_per_dest)) {
8546			goto no_data_fill;
8547		}
8548		/*********************/
8549		/* Data transmission */
8550		/*********************/
8551		/*
8552		 * if AUTH for DATA is required and no AUTH has been added
8553		 * yet, account for this in the mtu now... if no data can be
8554		 * bundled, this adjustment won't matter anyways since the
8555		 * packet will be going out...
8556		 */
8557		data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
8558		    stcb->asoc.peer_auth_chunks);
8559		if (data_auth_reqd && (auth == NULL)) {
8560			mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8561		}
8562		/* now lets add any data within the MTU constraints */
8563		switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8564#ifdef INET
8565		case AF_INET:
8566			if (net->mtu > (sizeof(struct ip) + sizeof(struct sctphdr)))
8567				omtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
8568			else
8569				omtu = 0;
8570			break;
8571#endif
8572#ifdef INET6
8573		case AF_INET6:
8574			if (net->mtu > (sizeof(struct ip6_hdr) + sizeof(struct sctphdr)))
8575				omtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
8576			else
8577				omtu = 0;
8578			break;
8579#endif
8580		default:
8581			/* TSNH */
8582			omtu = 0;
8583			break;
8584		}
8585		if ((((asoc->state & SCTP_STATE_OPEN) == SCTP_STATE_OPEN) &&
8586		    (skip_data_for_this_net == 0)) ||
8587		    (cookie)) {
8588			TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
8589				if (no_data_chunks) {
8590					/* let only control go out */
8591					*reason_code = 1;
8592					break;
8593				}
8594				if (net->flight_size >= net->cwnd) {
8595					/* skip this net, no room for data */
8596					*reason_code = 2;
8597					break;
8598				}
8599				if ((chk->whoTo != NULL) &&
8600				    (chk->whoTo != net)) {
8601					/* Don't send the chunk on this net */
8602					continue;
8603				}
8604				if (asoc->sctp_cmt_on_off == 0) {
8605					if ((asoc->alternate) &&
8606					    (asoc->alternate != net) &&
8607					    (chk->whoTo == NULL)) {
8608						continue;
8609					} else if ((net != asoc->primary_destination) &&
8610						    (asoc->alternate == NULL) &&
8611					    (chk->whoTo == NULL)) {
8612						continue;
8613					}
8614				}
8615				if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
8616					/*-
8617					 * strange, we have a chunk that is
8618					 * to big for its destination and
8619					 * yet no fragment ok flag.
8620					 * Something went wrong when the
8621					 * PMTU changed...we did not mark
8622					 * this chunk for some reason?? I
8623					 * will fix it here by letting IP
8624					 * fragment it for now and printing
8625					 * a warning. This really should not
8626					 * happen ...
8627					 */
8628					SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
8629					    chk->send_size, mtu);
8630					chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
8631				}
8632				if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
8633				    ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) == SCTP_STATE_SHUTDOWN_PENDING)) {
8634					struct sctp_data_chunk *dchkh;
8635
8636					dchkh = mtod(chk->data, struct sctp_data_chunk *);
8637					dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
8638				}
8639				if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
8640				    ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
8641					/* ok we will add this one */
8642
8643					/*
8644					 * Add an AUTH chunk, if chunk
8645					 * requires it, save the offset into
8646					 * the chain for AUTH
8647					 */
8648					if (data_auth_reqd) {
8649						if (auth == NULL) {
8650							outchain = sctp_add_auth_chunk(outchain,
8651							    &endoutchain,
8652							    &auth,
8653							    &auth_offset,
8654							    stcb,
8655							    SCTP_DATA);
8656							auth_keyid = chk->auth_keyid;
8657							override_ok = 0;
8658							SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8659						} else if (override_ok) {
8660							/*
8661							 * use this data's
8662							 * keyid
8663							 */
8664							auth_keyid = chk->auth_keyid;
8665							override_ok = 0;
8666						} else if (auth_keyid != chk->auth_keyid) {
8667							/*
8668							 * different keyid,
8669							 * so done bundling
8670							 */
8671							break;
8672						}
8673					}
8674					outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
8675					    chk->send_size, chk->copy_by_ref);
8676					if (outchain == NULL) {
8677						SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
8678						if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8679							sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8680						}
8681						*reason_code = 3;
8682						SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8683						return (ENOMEM);
8684					}
8685					/* upate our MTU size */
8686					/* Do clear IP_DF ? */
8687					if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8688						no_fragmentflg = 0;
8689					}
8690					/* unsigned subtraction of mtu */
8691					if (mtu > chk->send_size)
8692						mtu -= chk->send_size;
8693					else
8694						mtu = 0;
8695					/* unsigned subtraction of r_mtu */
8696					if (r_mtu > chk->send_size)
8697						r_mtu -= chk->send_size;
8698					else
8699						r_mtu = 0;
8700
8701					to_out += chk->send_size;
8702					if ((to_out > mx_mtu) && no_fragmentflg) {
8703#ifdef INVARIANTS
8704						panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
8705#else
8706						SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
8707						    mx_mtu, to_out);
8708#endif
8709					}
8710					chk->window_probe = 0;
8711					data_list[bundle_at++] = chk;
8712					if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8713						break;
8714					}
8715					if (chk->sent == SCTP_DATAGRAM_UNSENT) {
8716						if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
8717							SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
8718						} else {
8719							SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
8720						}
8721						if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
8722						    ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
8723							/*
8724							 * Count number of
8725							 * user msg's that
8726							 * were fragmented
8727							 * we do this by
8728							 * counting when we
8729							 * see a LAST
8730							 * fragment only.
8731							 */
8732							SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
8733					}
8734					if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
8735						if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
8736							data_list[0]->window_probe = 1;
8737							net->window_probe = 1;
8738						}
8739						break;
8740					}
8741				} else {
8742					/*
8743					 * Must be sent in order of the
8744					 * TSN's (on a network)
8745					 */
8746					break;
8747				}
8748			}	/* for (chunk gather loop for this net) */
8749		}		/* if asoc.state OPEN */
8750no_data_fill:
8751		/* Is there something to send for this destination? */
8752		if (outchain) {
8753			/* We may need to start a control timer or two */
8754			if (asconf) {
8755				sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
8756				    stcb, net);
8757				/*
8758				 * do NOT clear the asconf flag as it is
8759				 * used to do appropriate source address
8760				 * selection.
8761				 */
8762			}
8763			if (cookie) {
8764				sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8765				cookie = 0;
8766			}
8767			/* must start a send timer if data is being sent */
8768			if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8769				/*
8770				 * no timer running on this destination
8771				 * restart it.
8772				 */
8773				sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8774			}
8775			/* Now send it, if there is anything to send :> */
8776			if ((error = sctp_lowlevel_chunk_output(inp,
8777			    stcb,
8778			    net,
8779			    (struct sockaddr *)&net->ro._l_addr,
8780			    outchain,
8781			    auth_offset,
8782			    auth,
8783			    auth_keyid,
8784			    no_fragmentflg,
8785			    bundle_at,
8786			    asconf,
8787			    inp->sctp_lport, stcb->rport,
8788			    htonl(stcb->asoc.peer_vtag),
8789			    net->port, NULL,
8790			    0, 0,
8791			    so_locked))) {
8792				/* error, we could not output */
8793				if (error == ENOBUFS) {
8794					SCTP_STAT_INCR(sctps_lowlevelerr);
8795					asoc->ifp_had_enobuf = 1;
8796				}
8797				if (from_where == 0) {
8798					SCTP_STAT_INCR(sctps_lowlevelerrusr);
8799				}
8800				SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8801				if (hbflag) {
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					hbflag = 0;
8810				}
8811				if (error == EHOSTUNREACH) {
8812					/*
8813					 * Destination went unreachable
8814					 * during this send
8815					 */
8816					sctp_move_chunks_from_net(stcb, net);
8817				}
8818				*reason_code = 6;
8819				/*-
8820				 * I add this line to be paranoid. As far as
8821				 * I can tell the continue, takes us back to
8822				 * the top of the for, but just to make sure
8823				 * I will reset these again here.
8824				 */
8825				ctl_cnt = bundle_at = 0;
8826				continue;	/* This takes us back to the
8827						 * for() for the nets. */
8828			} else {
8829				asoc->ifp_had_enobuf = 0;
8830			}
8831			endoutchain = NULL;
8832			auth = NULL;
8833			auth_offset = 0;
8834			if (bundle_at || hbflag) {
8835				/* For data/asconf and hb set time */
8836				if (*now_filled == 0) {
8837					(void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8838					*now_filled = 1;
8839					*now = net->last_sent_time;
8840				} else {
8841					net->last_sent_time = *now;
8842				}
8843			}
8844			if (!no_out_cnt) {
8845				*num_out += (ctl_cnt + bundle_at);
8846			}
8847			if (bundle_at) {
8848				/* setup for a RTO measurement */
8849				tsns_sent = data_list[0]->rec.data.TSN_seq;
8850				/* fill time if not already filled */
8851				if (*now_filled == 0) {
8852					(void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8853					*now_filled = 1;
8854					*now = asoc->time_last_sent;
8855				} else {
8856					asoc->time_last_sent = *now;
8857				}
8858				if (net->rto_needed) {
8859					data_list[0]->do_rtt = 1;
8860					net->rto_needed = 0;
8861				}
8862				SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
8863				sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
8864			}
8865			if (one_chunk) {
8866				break;
8867			}
8868		}
8869		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8870			sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
8871		}
8872	}
8873	if (old_start_at == NULL) {
8874		old_start_at = start_at;
8875		start_at = TAILQ_FIRST(&asoc->nets);
8876		if (old_start_at)
8877			goto again_one_more_time;
8878	}
8879	/*
8880	 * At the end there should be no NON timed chunks hanging on this
8881	 * queue.
8882	 */
8883	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8884		sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
8885	}
8886	if ((*num_out == 0) && (*reason_code == 0)) {
8887		*reason_code = 4;
8888	} else {
8889		*reason_code = 5;
8890	}
8891	sctp_clean_up_ctl(stcb, asoc, so_locked);
8892	return (0);
8893}
8894
8895void
8896sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
8897{
8898	/*-
8899	 * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
8900	 * the control chunk queue.
8901	 */
8902	struct sctp_chunkhdr *hdr;
8903	struct sctp_tmit_chunk *chk;
8904	struct mbuf *mat;
8905
8906	SCTP_TCB_LOCK_ASSERT(stcb);
8907	sctp_alloc_a_chunk(stcb, chk);
8908	if (chk == NULL) {
8909		/* no memory */
8910		sctp_m_freem(op_err);
8911		return;
8912	}
8913	chk->copy_by_ref = 0;
8914	SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_NOWAIT);
8915	if (op_err == NULL) {
8916		sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
8917		return;
8918	}
8919	chk->send_size = 0;
8920	mat = op_err;
8921	while (mat != NULL) {
8922		chk->send_size += SCTP_BUF_LEN(mat);
8923		mat = SCTP_BUF_NEXT(mat);
8924	}
8925	chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
8926	chk->rec.chunk_id.can_take_data = 1;
8927	chk->sent = SCTP_DATAGRAM_UNSENT;
8928	chk->snd_count = 0;
8929	chk->flags = 0;
8930	chk->asoc = &stcb->asoc;
8931	chk->data = op_err;
8932	chk->whoTo = NULL;
8933	hdr = mtod(op_err, struct sctp_chunkhdr *);
8934	hdr->chunk_type = SCTP_OPERATION_ERROR;
8935	hdr->chunk_flags = 0;
8936	hdr->chunk_length = htons(chk->send_size);
8937	TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue,
8938	    chk,
8939	    sctp_next);
8940	chk->asoc->ctrl_queue_cnt++;
8941}
8942
8943int
8944sctp_send_cookie_echo(struct mbuf *m,
8945    int offset,
8946    struct sctp_tcb *stcb,
8947    struct sctp_nets *net)
8948{
8949	/*-
8950	 * pull out the cookie and put it at the front of the control chunk
8951	 * queue.
8952	 */
8953	int at;
8954	struct mbuf *cookie;
8955	struct sctp_paramhdr parm, *phdr;
8956	struct sctp_chunkhdr *hdr;
8957	struct sctp_tmit_chunk *chk;
8958	uint16_t ptype, plen;
8959
8960	/* First find the cookie in the param area */
8961	cookie = NULL;
8962	at = offset + sizeof(struct sctp_init_chunk);
8963
8964	SCTP_TCB_LOCK_ASSERT(stcb);
8965	do {
8966		phdr = sctp_get_next_param(m, at, &parm, sizeof(parm));
8967		if (phdr == NULL) {
8968			return (-3);
8969		}
8970		ptype = ntohs(phdr->param_type);
8971		plen = ntohs(phdr->param_length);
8972		if (ptype == SCTP_STATE_COOKIE) {
8973			int pad;
8974
8975			/* found the cookie */
8976			if ((pad = (plen % 4))) {
8977				plen += 4 - pad;
8978			}
8979			cookie = SCTP_M_COPYM(m, at, plen, M_NOWAIT);
8980			if (cookie == NULL) {
8981				/* No memory */
8982				return (-2);
8983			}
8984#ifdef SCTP_MBUF_LOGGING
8985			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8986				struct mbuf *mat;
8987
8988				for (mat = cookie; mat; mat = SCTP_BUF_NEXT(mat)) {
8989					if (SCTP_BUF_IS_EXTENDED(mat)) {
8990						sctp_log_mb(mat, SCTP_MBUF_ICOPY);
8991					}
8992				}
8993			}
8994#endif
8995			break;
8996		}
8997		at += SCTP_SIZE32(plen);
8998	} while (phdr);
8999	if (cookie == NULL) {
9000		/* Did not find the cookie */
9001		return (-3);
9002	}
9003	/* ok, we got the cookie lets change it into a cookie echo chunk */
9004
9005	/* first the change from param to cookie */
9006	hdr = mtod(cookie, struct sctp_chunkhdr *);
9007	hdr->chunk_type = SCTP_COOKIE_ECHO;
9008	hdr->chunk_flags = 0;
9009	/* get the chunk stuff now and place it in the FRONT of the queue */
9010	sctp_alloc_a_chunk(stcb, chk);
9011	if (chk == NULL) {
9012		/* no memory */
9013		sctp_m_freem(cookie);
9014		return (-5);
9015	}
9016	chk->copy_by_ref = 0;
9017	chk->send_size = plen;
9018	chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
9019	chk->rec.chunk_id.can_take_data = 0;
9020	chk->sent = SCTP_DATAGRAM_UNSENT;
9021	chk->snd_count = 0;
9022	chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9023	chk->asoc = &stcb->asoc;
9024	chk->data = cookie;
9025	chk->whoTo = net;
9026	atomic_add_int(&chk->whoTo->ref_count, 1);
9027	TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
9028	chk->asoc->ctrl_queue_cnt++;
9029	return (0);
9030}
9031
9032void
9033sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
9034    struct mbuf *m,
9035    int offset,
9036    int chk_length,
9037    struct sctp_nets *net)
9038{
9039	/*
9040	 * take a HB request and make it into a HB ack and send it.
9041	 */
9042	struct mbuf *outchain;
9043	struct sctp_chunkhdr *chdr;
9044	struct sctp_tmit_chunk *chk;
9045
9046
9047	if (net == NULL)
9048		/* must have a net pointer */
9049		return;
9050
9051	outchain = SCTP_M_COPYM(m, offset, chk_length, M_NOWAIT);
9052	if (outchain == NULL) {
9053		/* gak out of memory */
9054		return;
9055	}
9056#ifdef SCTP_MBUF_LOGGING
9057	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9058		struct mbuf *mat;
9059
9060		for (mat = outchain; mat; mat = SCTP_BUF_NEXT(mat)) {
9061			if (SCTP_BUF_IS_EXTENDED(mat)) {
9062				sctp_log_mb(mat, SCTP_MBUF_ICOPY);
9063			}
9064		}
9065	}
9066#endif
9067	chdr = mtod(outchain, struct sctp_chunkhdr *);
9068	chdr->chunk_type = SCTP_HEARTBEAT_ACK;
9069	chdr->chunk_flags = 0;
9070	if (chk_length % 4) {
9071		/* need pad */
9072		uint32_t cpthis = 0;
9073		int padlen;
9074
9075		padlen = 4 - (chk_length % 4);
9076		m_copyback(outchain, chk_length, padlen, (caddr_t)&cpthis);
9077	}
9078	sctp_alloc_a_chunk(stcb, chk);
9079	if (chk == NULL) {
9080		/* no memory */
9081		sctp_m_freem(outchain);
9082		return;
9083	}
9084	chk->copy_by_ref = 0;
9085	chk->send_size = chk_length;
9086	chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
9087	chk->rec.chunk_id.can_take_data = 1;
9088	chk->sent = SCTP_DATAGRAM_UNSENT;
9089	chk->snd_count = 0;
9090	chk->flags = 0;
9091	chk->asoc = &stcb->asoc;
9092	chk->data = outchain;
9093	chk->whoTo = net;
9094	atomic_add_int(&chk->whoTo->ref_count, 1);
9095	TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9096	chk->asoc->ctrl_queue_cnt++;
9097}
9098
9099void
9100sctp_send_cookie_ack(struct sctp_tcb *stcb)
9101{
9102	/* formulate and queue a cookie-ack back to sender */
9103	struct mbuf *cookie_ack;
9104	struct sctp_chunkhdr *hdr;
9105	struct sctp_tmit_chunk *chk;
9106
9107	SCTP_TCB_LOCK_ASSERT(stcb);
9108
9109	cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
9110	if (cookie_ack == NULL) {
9111		/* no mbuf's */
9112		return;
9113	}
9114	SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
9115	sctp_alloc_a_chunk(stcb, chk);
9116	if (chk == NULL) {
9117		/* no memory */
9118		sctp_m_freem(cookie_ack);
9119		return;
9120	}
9121	chk->copy_by_ref = 0;
9122	chk->send_size = sizeof(struct sctp_chunkhdr);
9123	chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
9124	chk->rec.chunk_id.can_take_data = 1;
9125	chk->sent = SCTP_DATAGRAM_UNSENT;
9126	chk->snd_count = 0;
9127	chk->flags = 0;
9128	chk->asoc = &stcb->asoc;
9129	chk->data = cookie_ack;
9130	if (chk->asoc->last_control_chunk_from != NULL) {
9131		chk->whoTo = chk->asoc->last_control_chunk_from;
9132		atomic_add_int(&chk->whoTo->ref_count, 1);
9133	} else {
9134		chk->whoTo = NULL;
9135	}
9136	hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
9137	hdr->chunk_type = SCTP_COOKIE_ACK;
9138	hdr->chunk_flags = 0;
9139	hdr->chunk_length = htons(chk->send_size);
9140	SCTP_BUF_LEN(cookie_ack) = chk->send_size;
9141	TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9142	chk->asoc->ctrl_queue_cnt++;
9143	return;
9144}
9145
9146
9147void
9148sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
9149{
9150	/* formulate and queue a SHUTDOWN-ACK back to the sender */
9151	struct mbuf *m_shutdown_ack;
9152	struct sctp_shutdown_ack_chunk *ack_cp;
9153	struct sctp_tmit_chunk *chk;
9154
9155	m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9156	if (m_shutdown_ack == NULL) {
9157		/* no mbuf's */
9158		return;
9159	}
9160	SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
9161	sctp_alloc_a_chunk(stcb, chk);
9162	if (chk == NULL) {
9163		/* no memory */
9164		sctp_m_freem(m_shutdown_ack);
9165		return;
9166	}
9167	chk->copy_by_ref = 0;
9168	chk->send_size = sizeof(struct sctp_chunkhdr);
9169	chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
9170	chk->rec.chunk_id.can_take_data = 1;
9171	chk->sent = SCTP_DATAGRAM_UNSENT;
9172	chk->snd_count = 0;
9173	chk->flags = 0;
9174	chk->asoc = &stcb->asoc;
9175	chk->data = m_shutdown_ack;
9176	chk->whoTo = net;
9177	if (chk->whoTo) {
9178		atomic_add_int(&chk->whoTo->ref_count, 1);
9179	}
9180	ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
9181	ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
9182	ack_cp->ch.chunk_flags = 0;
9183	ack_cp->ch.chunk_length = htons(chk->send_size);
9184	SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
9185	TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9186	chk->asoc->ctrl_queue_cnt++;
9187	return;
9188}
9189
9190void
9191sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
9192{
9193	/* formulate and queue a SHUTDOWN to the sender */
9194	struct mbuf *m_shutdown;
9195	struct sctp_shutdown_chunk *shutdown_cp;
9196	struct sctp_tmit_chunk *chk;
9197
9198	m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9199	if (m_shutdown == NULL) {
9200		/* no mbuf's */
9201		return;
9202	}
9203	SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
9204	sctp_alloc_a_chunk(stcb, chk);
9205	if (chk == NULL) {
9206		/* no memory */
9207		sctp_m_freem(m_shutdown);
9208		return;
9209	}
9210	chk->copy_by_ref = 0;
9211	chk->send_size = sizeof(struct sctp_shutdown_chunk);
9212	chk->rec.chunk_id.id = SCTP_SHUTDOWN;
9213	chk->rec.chunk_id.can_take_data = 1;
9214	chk->sent = SCTP_DATAGRAM_UNSENT;
9215	chk->snd_count = 0;
9216	chk->flags = 0;
9217	chk->asoc = &stcb->asoc;
9218	chk->data = m_shutdown;
9219	chk->whoTo = net;
9220	if (chk->whoTo) {
9221		atomic_add_int(&chk->whoTo->ref_count, 1);
9222	}
9223	shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
9224	shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
9225	shutdown_cp->ch.chunk_flags = 0;
9226	shutdown_cp->ch.chunk_length = htons(chk->send_size);
9227	shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9228	SCTP_BUF_LEN(m_shutdown) = chk->send_size;
9229	TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9230	chk->asoc->ctrl_queue_cnt++;
9231	return;
9232}
9233
9234void
9235sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
9236{
9237	/*
9238	 * formulate and queue an ASCONF to the peer. ASCONF parameters
9239	 * should be queued on the assoc queue.
9240	 */
9241	struct sctp_tmit_chunk *chk;
9242	struct mbuf *m_asconf;
9243	int len;
9244
9245	SCTP_TCB_LOCK_ASSERT(stcb);
9246
9247	if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
9248	    (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
9249		/* can't send a new one if there is one in flight already */
9250		return;
9251	}
9252	/* compose an ASCONF chunk, maximum length is PMTU */
9253	m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
9254	if (m_asconf == NULL) {
9255		return;
9256	}
9257	sctp_alloc_a_chunk(stcb, chk);
9258	if (chk == NULL) {
9259		/* no memory */
9260		sctp_m_freem(m_asconf);
9261		return;
9262	}
9263	chk->copy_by_ref = 0;
9264	chk->data = m_asconf;
9265	chk->send_size = len;
9266	chk->rec.chunk_id.id = SCTP_ASCONF;
9267	chk->rec.chunk_id.can_take_data = 0;
9268	chk->sent = SCTP_DATAGRAM_UNSENT;
9269	chk->snd_count = 0;
9270	chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9271	chk->asoc = &stcb->asoc;
9272	chk->whoTo = net;
9273	if (chk->whoTo) {
9274		atomic_add_int(&chk->whoTo->ref_count, 1);
9275	}
9276	TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
9277	chk->asoc->ctrl_queue_cnt++;
9278	return;
9279}
9280
9281void
9282sctp_send_asconf_ack(struct sctp_tcb *stcb)
9283{
9284	/*
9285	 * formulate and queue a asconf-ack back to sender. the asconf-ack
9286	 * must be stored in the tcb.
9287	 */
9288	struct sctp_tmit_chunk *chk;
9289	struct sctp_asconf_ack *ack, *latest_ack;
9290	struct mbuf *m_ack;
9291	struct sctp_nets *net = NULL;
9292
9293	SCTP_TCB_LOCK_ASSERT(stcb);
9294	/* Get the latest ASCONF-ACK */
9295	latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
9296	if (latest_ack == NULL) {
9297		return;
9298	}
9299	if (latest_ack->last_sent_to != NULL &&
9300	    latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
9301		/* we're doing a retransmission */
9302		net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
9303		if (net == NULL) {
9304			/* no alternate */
9305			if (stcb->asoc.last_control_chunk_from == NULL) {
9306				if (stcb->asoc.alternate) {
9307					net = stcb->asoc.alternate;
9308				} else {
9309					net = stcb->asoc.primary_destination;
9310				}
9311			} else {
9312				net = stcb->asoc.last_control_chunk_from;
9313			}
9314		}
9315	} else {
9316		/* normal case */
9317		if (stcb->asoc.last_control_chunk_from == NULL) {
9318			if (stcb->asoc.alternate) {
9319				net = stcb->asoc.alternate;
9320			} else {
9321				net = stcb->asoc.primary_destination;
9322			}
9323		} else {
9324			net = stcb->asoc.last_control_chunk_from;
9325		}
9326	}
9327	latest_ack->last_sent_to = net;
9328
9329	TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
9330		if (ack->data == NULL) {
9331			continue;
9332		}
9333		/* copy the asconf_ack */
9334		m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_NOWAIT);
9335		if (m_ack == NULL) {
9336			/* couldn't copy it */
9337			return;
9338		}
9339#ifdef SCTP_MBUF_LOGGING
9340		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9341			struct mbuf *mat;
9342
9343			for (mat = m_ack; mat; mat = SCTP_BUF_NEXT(mat)) {
9344				if (SCTP_BUF_IS_EXTENDED(mat)) {
9345					sctp_log_mb(mat, SCTP_MBUF_ICOPY);
9346				}
9347			}
9348		}
9349#endif
9350
9351		sctp_alloc_a_chunk(stcb, chk);
9352		if (chk == NULL) {
9353			/* no memory */
9354			if (m_ack)
9355				sctp_m_freem(m_ack);
9356			return;
9357		}
9358		chk->copy_by_ref = 0;
9359
9360		chk->whoTo = net;
9361		if (chk->whoTo) {
9362			atomic_add_int(&chk->whoTo->ref_count, 1);
9363		}
9364		chk->data = m_ack;
9365		chk->send_size = 0;
9366		/* Get size */
9367		chk->send_size = ack->len;
9368		chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
9369		chk->rec.chunk_id.can_take_data = 1;
9370		chk->sent = SCTP_DATAGRAM_UNSENT;
9371		chk->snd_count = 0;
9372		chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;	/* XXX */
9373		chk->asoc = &stcb->asoc;
9374
9375		TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9376		chk->asoc->ctrl_queue_cnt++;
9377	}
9378	return;
9379}
9380
9381
9382static int
9383sctp_chunk_retransmission(struct sctp_inpcb *inp,
9384    struct sctp_tcb *stcb,
9385    struct sctp_association *asoc,
9386    int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked
9387#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9388    SCTP_UNUSED
9389#endif
9390)
9391{
9392	/*-
9393	 * send out one MTU of retransmission. If fast_retransmit is
9394	 * happening we ignore the cwnd. Otherwise we obey the cwnd and
9395	 * rwnd. For a Cookie or Asconf in the control chunk queue we
9396	 * retransmit them by themselves.
9397	 *
9398	 * For data chunks we will pick out the lowest TSN's in the sent_queue
9399	 * marked for resend and bundle them all together (up to a MTU of
9400	 * destination). The address to send to should have been
9401	 * selected/changed where the retransmission was marked (i.e. in FR
9402	 * or t3-timeout routines).
9403	 */
9404	struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
9405	struct sctp_tmit_chunk *chk, *fwd;
9406	struct mbuf *m, *endofchain;
9407	struct sctp_nets *net = NULL;
9408	uint32_t tsns_sent = 0;
9409	int no_fragmentflg, bundle_at, cnt_thru;
9410	unsigned int mtu;
9411	int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
9412	struct sctp_auth_chunk *auth = NULL;
9413	uint32_t auth_offset = 0;
9414	uint16_t auth_keyid;
9415	int override_ok = 1;
9416	int data_auth_reqd = 0;
9417	uint32_t dmtu = 0;
9418
9419	SCTP_TCB_LOCK_ASSERT(stcb);
9420	tmr_started = ctl_cnt = bundle_at = error = 0;
9421	no_fragmentflg = 1;
9422	fwd_tsn = 0;
9423	*cnt_out = 0;
9424	fwd = NULL;
9425	endofchain = m = NULL;
9426	auth_keyid = stcb->asoc.authinfo.active_keyid;
9427#ifdef SCTP_AUDITING_ENABLED
9428	sctp_audit_log(0xC3, 1);
9429#endif
9430	if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
9431	    (TAILQ_EMPTY(&asoc->control_send_queue))) {
9432		SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
9433		    asoc->sent_queue_retran_cnt);
9434		asoc->sent_queue_cnt = 0;
9435		asoc->sent_queue_cnt_removeable = 0;
9436		/* send back 0/0 so we enter normal transmission */
9437		*cnt_out = 0;
9438		return (0);
9439	}
9440	TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9441		if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
9442		    (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
9443		    (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
9444			if (chk->sent != SCTP_DATAGRAM_RESEND) {
9445				continue;
9446			}
9447			if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
9448				if (chk != asoc->str_reset) {
9449					/*
9450					 * not eligible for retran if its
9451					 * not ours
9452					 */
9453					continue;
9454				}
9455			}
9456			ctl_cnt++;
9457			if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9458				fwd_tsn = 1;
9459			}
9460			/*
9461			 * Add an AUTH chunk, if chunk requires it save the
9462			 * offset into the chain for AUTH
9463			 */
9464			if ((auth == NULL) &&
9465			    (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
9466			    stcb->asoc.peer_auth_chunks))) {
9467				m = sctp_add_auth_chunk(m, &endofchain,
9468				    &auth, &auth_offset,
9469				    stcb,
9470				    chk->rec.chunk_id.id);
9471				SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9472			}
9473			m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9474			break;
9475		}
9476	}
9477	one_chunk = 0;
9478	cnt_thru = 0;
9479	/* do we have control chunks to retransmit? */
9480	if (m != NULL) {
9481		/* Start a timer no matter if we suceed or fail */
9482		if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
9483			sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
9484		} else if (chk->rec.chunk_id.id == SCTP_ASCONF)
9485			sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
9486		chk->snd_count++;	/* update our count */
9487		if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
9488		    (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
9489		    auth_offset, auth, stcb->asoc.authinfo.active_keyid,
9490		    no_fragmentflg, 0, 0,
9491		    inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9492		    chk->whoTo->port, NULL,
9493		    0, 0,
9494		    so_locked))) {
9495			SCTP_STAT_INCR(sctps_lowlevelerr);
9496			return (error);
9497		}
9498		endofchain = NULL;
9499		auth = NULL;
9500		auth_offset = 0;
9501		/*
9502		 * We don't want to mark the net->sent time here since this
9503		 * we use this for HB and retrans cannot measure RTT
9504		 */
9505		/* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
9506		*cnt_out += 1;
9507		chk->sent = SCTP_DATAGRAM_SENT;
9508		sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
9509		if (fwd_tsn == 0) {
9510			return (0);
9511		} else {
9512			/* Clean up the fwd-tsn list */
9513			sctp_clean_up_ctl(stcb, asoc, so_locked);
9514			return (0);
9515		}
9516	}
9517	/*
9518	 * Ok, it is just data retransmission we need to do or that and a
9519	 * fwd-tsn with it all.
9520	 */
9521	if (TAILQ_EMPTY(&asoc->sent_queue)) {
9522		return (SCTP_RETRAN_DONE);
9523	}
9524	if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) ||
9525	    (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT)) {
9526		/* not yet open, resend the cookie and that is it */
9527		return (1);
9528	}
9529#ifdef SCTP_AUDITING_ENABLED
9530	sctp_auditing(20, inp, stcb, NULL);
9531#endif
9532	data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
9533	TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
9534		if (chk->sent != SCTP_DATAGRAM_RESEND) {
9535			/* No, not sent to this net or not ready for rtx */
9536			continue;
9537		}
9538		if (chk->data == NULL) {
9539			SCTP_PRINTF("TSN:%x chk->snd_count:%d chk->sent:%d can't retran - no data\n",
9540			    chk->rec.data.TSN_seq, chk->snd_count, chk->sent);
9541			continue;
9542		}
9543		if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
9544		    (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
9545			/* Gak, we have exceeded max unlucky retran, abort! */
9546			SCTP_PRINTF("Gak, chk->snd_count:%d >= max:%d - send abort\n",
9547			    chk->snd_count,
9548			    SCTP_BASE_SYSCTL(sctp_max_retran_chunk));
9549			atomic_add_int(&stcb->asoc.refcnt, 1);
9550			sctp_abort_an_association(stcb->sctp_ep, stcb, NULL, so_locked);
9551			SCTP_TCB_LOCK(stcb);
9552			atomic_subtract_int(&stcb->asoc.refcnt, 1);
9553			return (SCTP_RETRAN_EXIT);
9554		}
9555		/* pick up the net */
9556		net = chk->whoTo;
9557		switch (net->ro._l_addr.sa.sa_family) {
9558#ifdef INET
9559		case AF_INET:
9560			mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
9561			break;
9562#endif
9563#ifdef INET6
9564		case AF_INET6:
9565			mtu = net->mtu - SCTP_MIN_OVERHEAD;
9566			break;
9567#endif
9568		default:
9569			/* TSNH */
9570			mtu = net->mtu;
9571			break;
9572		}
9573
9574		if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
9575			/* No room in peers rwnd */
9576			uint32_t tsn;
9577
9578			tsn = asoc->last_acked_seq + 1;
9579			if (tsn == chk->rec.data.TSN_seq) {
9580				/*
9581				 * we make a special exception for this
9582				 * case. The peer has no rwnd but is missing
9583				 * the lowest chunk.. which is probably what
9584				 * is holding up the rwnd.
9585				 */
9586				goto one_chunk_around;
9587			}
9588			return (1);
9589		}
9590one_chunk_around:
9591		if (asoc->peers_rwnd < mtu) {
9592			one_chunk = 1;
9593			if ((asoc->peers_rwnd == 0) &&
9594			    (asoc->total_flight == 0)) {
9595				chk->window_probe = 1;
9596				chk->whoTo->window_probe = 1;
9597			}
9598		}
9599#ifdef SCTP_AUDITING_ENABLED
9600		sctp_audit_log(0xC3, 2);
9601#endif
9602		bundle_at = 0;
9603		m = NULL;
9604		net->fast_retran_ip = 0;
9605		if (chk->rec.data.doing_fast_retransmit == 0) {
9606			/*
9607			 * if no FR in progress skip destination that have
9608			 * flight_size > cwnd.
9609			 */
9610			if (net->flight_size >= net->cwnd) {
9611				continue;
9612			}
9613		} else {
9614			/*
9615			 * Mark the destination net to have FR recovery
9616			 * limits put on it.
9617			 */
9618			*fr_done = 1;
9619			net->fast_retran_ip = 1;
9620		}
9621
9622		/*
9623		 * if no AUTH is yet included and this chunk requires it,
9624		 * make sure to account for it.  We don't apply the size
9625		 * until the AUTH chunk is actually added below in case
9626		 * there is no room for this chunk.
9627		 */
9628		if (data_auth_reqd && (auth == NULL)) {
9629			dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9630		} else
9631			dmtu = 0;
9632
9633		if ((chk->send_size <= (mtu - dmtu)) ||
9634		    (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
9635			/* ok we will add this one */
9636			if (data_auth_reqd) {
9637				if (auth == NULL) {
9638					m = sctp_add_auth_chunk(m,
9639					    &endofchain,
9640					    &auth,
9641					    &auth_offset,
9642					    stcb,
9643					    SCTP_DATA);
9644					auth_keyid = chk->auth_keyid;
9645					override_ok = 0;
9646					SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9647				} else if (override_ok) {
9648					auth_keyid = chk->auth_keyid;
9649					override_ok = 0;
9650				} else if (chk->auth_keyid != auth_keyid) {
9651					/* different keyid, so done bundling */
9652					break;
9653				}
9654			}
9655			m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9656			if (m == NULL) {
9657				SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9658				return (ENOMEM);
9659			}
9660			/* Do clear IP_DF ? */
9661			if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9662				no_fragmentflg = 0;
9663			}
9664			/* upate our MTU size */
9665			if (mtu > (chk->send_size + dmtu))
9666				mtu -= (chk->send_size + dmtu);
9667			else
9668				mtu = 0;
9669			data_list[bundle_at++] = chk;
9670			if (one_chunk && (asoc->total_flight <= 0)) {
9671				SCTP_STAT_INCR(sctps_windowprobed);
9672			}
9673		}
9674		if (one_chunk == 0) {
9675			/*
9676			 * now are there anymore forward from chk to pick
9677			 * up?
9678			 */
9679			for (fwd = TAILQ_NEXT(chk, sctp_next); fwd != NULL; fwd = TAILQ_NEXT(fwd, sctp_next)) {
9680				if (fwd->sent != SCTP_DATAGRAM_RESEND) {
9681					/* Nope, not for retran */
9682					continue;
9683				}
9684				if (fwd->whoTo != net) {
9685					/* Nope, not the net in question */
9686					continue;
9687				}
9688				if (data_auth_reqd && (auth == NULL)) {
9689					dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9690				} else
9691					dmtu = 0;
9692				if (fwd->send_size <= (mtu - dmtu)) {
9693					if (data_auth_reqd) {
9694						if (auth == NULL) {
9695							m = sctp_add_auth_chunk(m,
9696							    &endofchain,
9697							    &auth,
9698							    &auth_offset,
9699							    stcb,
9700							    SCTP_DATA);
9701							auth_keyid = fwd->auth_keyid;
9702							override_ok = 0;
9703							SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9704						} else if (override_ok) {
9705							auth_keyid = fwd->auth_keyid;
9706							override_ok = 0;
9707						} else if (fwd->auth_keyid != auth_keyid) {
9708							/*
9709							 * different keyid,
9710							 * so done bundling
9711							 */
9712							break;
9713						}
9714					}
9715					m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
9716					if (m == NULL) {
9717						SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9718						return (ENOMEM);
9719					}
9720					/* Do clear IP_DF ? */
9721					if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9722						no_fragmentflg = 0;
9723					}
9724					/* upate our MTU size */
9725					if (mtu > (fwd->send_size + dmtu))
9726						mtu -= (fwd->send_size + dmtu);
9727					else
9728						mtu = 0;
9729					data_list[bundle_at++] = fwd;
9730					if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
9731						break;
9732					}
9733				} else {
9734					/* can't fit so we are done */
9735					break;
9736				}
9737			}
9738		}
9739		/* Is there something to send for this destination? */
9740		if (m) {
9741			/*
9742			 * No matter if we fail/or suceed we should start a
9743			 * timer. A failure is like a lost IP packet :-)
9744			 */
9745			if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9746				/*
9747				 * no timer running on this destination
9748				 * restart it.
9749				 */
9750				sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9751				tmr_started = 1;
9752			}
9753			/* Now lets send it, if there is anything to send :> */
9754			if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
9755			    (struct sockaddr *)&net->ro._l_addr, m,
9756			    auth_offset, auth, auth_keyid,
9757			    no_fragmentflg, 0, 0,
9758			    inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9759			    net->port, NULL,
9760			    0, 0,
9761			    so_locked))) {
9762				/* error, we could not output */
9763				SCTP_STAT_INCR(sctps_lowlevelerr);
9764				return (error);
9765			}
9766			endofchain = NULL;
9767			auth = NULL;
9768			auth_offset = 0;
9769			/* For HB's */
9770			/*
9771			 * We don't want to mark the net->sent time here
9772			 * since this we use this for HB and retrans cannot
9773			 * measure RTT
9774			 */
9775			/* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
9776
9777			/* For auto-close */
9778			cnt_thru++;
9779			if (*now_filled == 0) {
9780				(void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
9781				*now = asoc->time_last_sent;
9782				*now_filled = 1;
9783			} else {
9784				asoc->time_last_sent = *now;
9785			}
9786			*cnt_out += bundle_at;
9787#ifdef SCTP_AUDITING_ENABLED
9788			sctp_audit_log(0xC4, bundle_at);
9789#endif
9790			if (bundle_at) {
9791				tsns_sent = data_list[0]->rec.data.TSN_seq;
9792			}
9793			for (i = 0; i < bundle_at; i++) {
9794				SCTP_STAT_INCR(sctps_sendretransdata);
9795				data_list[i]->sent = SCTP_DATAGRAM_SENT;
9796				/*
9797				 * When we have a revoked data, and we
9798				 * retransmit it, then we clear the revoked
9799				 * flag since this flag dictates if we
9800				 * subtracted from the fs
9801				 */
9802				if (data_list[i]->rec.data.chunk_was_revoked) {
9803					/* Deflate the cwnd */
9804					data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
9805					data_list[i]->rec.data.chunk_was_revoked = 0;
9806				}
9807				data_list[i]->snd_count++;
9808				sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9809				/* record the time */
9810				data_list[i]->sent_rcv_time = asoc->time_last_sent;
9811				if (data_list[i]->book_size_scale) {
9812					/*
9813					 * need to double the book size on
9814					 * this one
9815					 */
9816					data_list[i]->book_size_scale = 0;
9817					/*
9818					 * Since we double the booksize, we
9819					 * must also double the output queue
9820					 * size, since this get shrunk when
9821					 * we free by this amount.
9822					 */
9823					atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
9824					data_list[i]->book_size *= 2;
9825
9826
9827				} else {
9828					if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
9829						sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
9830						    asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
9831					}
9832					asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
9833					    (uint32_t) (data_list[i]->send_size +
9834					    SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
9835				}
9836				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
9837					sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
9838					    data_list[i]->whoTo->flight_size,
9839					    data_list[i]->book_size,
9840					    (uintptr_t) data_list[i]->whoTo,
9841					    data_list[i]->rec.data.TSN_seq);
9842				}
9843				sctp_flight_size_increase(data_list[i]);
9844				sctp_total_flight_increase(stcb, data_list[i]);
9845				if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
9846					/* SWS sender side engages */
9847					asoc->peers_rwnd = 0;
9848				}
9849				if ((i == 0) &&
9850				    (data_list[i]->rec.data.doing_fast_retransmit)) {
9851					SCTP_STAT_INCR(sctps_sendfastretrans);
9852					if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
9853					    (tmr_started == 0)) {
9854						/*-
9855						 * ok we just fast-retrans'd
9856						 * the lowest TSN, i.e the
9857						 * first on the list. In
9858						 * this case we want to give
9859						 * some more time to get a
9860						 * SACK back without a
9861						 * t3-expiring.
9862						 */
9863						sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
9864						    SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
9865						sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9866					}
9867				}
9868			}
9869			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9870				sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
9871			}
9872#ifdef SCTP_AUDITING_ENABLED
9873			sctp_auditing(21, inp, stcb, NULL);
9874#endif
9875		} else {
9876			/* None will fit */
9877			return (1);
9878		}
9879		if (asoc->sent_queue_retran_cnt <= 0) {
9880			/* all done we have no more to retran */
9881			asoc->sent_queue_retran_cnt = 0;
9882			break;
9883		}
9884		if (one_chunk) {
9885			/* No more room in rwnd */
9886			return (1);
9887		}
9888		/* stop the for loop here. we sent out a packet */
9889		break;
9890	}
9891	return (0);
9892}
9893
9894static void
9895sctp_timer_validation(struct sctp_inpcb *inp,
9896    struct sctp_tcb *stcb,
9897    struct sctp_association *asoc)
9898{
9899	struct sctp_nets *net;
9900
9901	/* Validate that a timer is running somewhere */
9902	TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9903		if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9904			/* Here is a timer */
9905			return;
9906		}
9907	}
9908	SCTP_TCB_LOCK_ASSERT(stcb);
9909	/* Gak, we did not have a timer somewhere */
9910	SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
9911	if (asoc->alternate) {
9912		sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->alternate);
9913	} else {
9914		sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
9915	}
9916	return;
9917}
9918
9919void
9920sctp_chunk_output(struct sctp_inpcb *inp,
9921    struct sctp_tcb *stcb,
9922    int from_where,
9923    int so_locked
9924#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9925    SCTP_UNUSED
9926#endif
9927)
9928{
9929	/*-
9930	 * Ok this is the generic chunk service queue. we must do the
9931	 * following:
9932	 * - See if there are retransmits pending, if so we must
9933	 *   do these first.
9934	 * - Service the stream queue that is next, moving any
9935	 *   message (note I must get a complete message i.e.
9936	 *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
9937	 *   TSN's
9938	 * - Check to see if the cwnd/rwnd allows any output, if so we
9939	 *   go ahead and fomulate and send the low level chunks. Making sure
9940	 *   to combine any control in the control chunk queue also.
9941	 */
9942	struct sctp_association *asoc;
9943	struct sctp_nets *net;
9944	int error = 0, num_out = 0, tot_out = 0, ret = 0, reason_code = 0;
9945	unsigned int burst_cnt = 0;
9946	struct timeval now;
9947	int now_filled = 0;
9948	int nagle_on;
9949	int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
9950	int un_sent = 0;
9951	int fr_done;
9952	unsigned int tot_frs = 0;
9953
9954	asoc = &stcb->asoc;
9955	/* The Nagle algorithm is only applied when handling a send call. */
9956	if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
9957		if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
9958			nagle_on = 0;
9959		} else {
9960			nagle_on = 1;
9961		}
9962	} else {
9963		nagle_on = 0;
9964	}
9965	SCTP_TCB_LOCK_ASSERT(stcb);
9966
9967	un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
9968
9969	if ((un_sent <= 0) &&
9970	    (TAILQ_EMPTY(&asoc->control_send_queue)) &&
9971	    (TAILQ_EMPTY(&asoc->asconf_send_queue)) &&
9972	    (asoc->sent_queue_retran_cnt == 0)) {
9973		/* Nothing to do unless there is something to be sent left */
9974		return;
9975	}
9976	/*
9977	 * Do we have something to send, data or control AND a sack timer
9978	 * running, if so piggy-back the sack.
9979	 */
9980	if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
9981		sctp_send_sack(stcb, so_locked);
9982		(void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
9983	}
9984	while (asoc->sent_queue_retran_cnt) {
9985		/*-
9986		 * Ok, it is retransmission time only, we send out only ONE
9987		 * packet with a single call off to the retran code.
9988		 */
9989		if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
9990			/*-
9991			 * Special hook for handling cookiess discarded
9992			 * by peer that carried data. Send cookie-ack only
9993			 * and then the next call with get the retran's.
9994			 */
9995			(void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9996			    from_where,
9997			    &now, &now_filled, frag_point, so_locked);
9998			return;
9999		} else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
10000			/* if its not from a HB then do it */
10001			fr_done = 0;
10002			ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
10003			if (fr_done) {
10004				tot_frs++;
10005			}
10006		} else {
10007			/*
10008			 * its from any other place, we don't allow retran
10009			 * output (only control)
10010			 */
10011			ret = 1;
10012		}
10013		if (ret > 0) {
10014			/* Can't send anymore */
10015			/*-
10016			 * now lets push out control by calling med-level
10017			 * output once. this assures that we WILL send HB's
10018			 * if queued too.
10019			 */
10020			(void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10021			    from_where,
10022			    &now, &now_filled, frag_point, so_locked);
10023#ifdef SCTP_AUDITING_ENABLED
10024			sctp_auditing(8, inp, stcb, NULL);
10025#endif
10026			sctp_timer_validation(inp, stcb, asoc);
10027			return;
10028		}
10029		if (ret < 0) {
10030			/*-
10031			 * The count was off.. retran is not happening so do
10032			 * the normal retransmission.
10033			 */
10034#ifdef SCTP_AUDITING_ENABLED
10035			sctp_auditing(9, inp, stcb, NULL);
10036#endif
10037			if (ret == SCTP_RETRAN_EXIT) {
10038				return;
10039			}
10040			break;
10041		}
10042		if (from_where == SCTP_OUTPUT_FROM_T3) {
10043			/* Only one transmission allowed out of a timeout */
10044#ifdef SCTP_AUDITING_ENABLED
10045			sctp_auditing(10, inp, stcb, NULL);
10046#endif
10047			/* Push out any control */
10048			(void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
10049			    &now, &now_filled, frag_point, so_locked);
10050			return;
10051		}
10052		if ((asoc->fr_max_burst > 0) && (tot_frs >= asoc->fr_max_burst)) {
10053			/* Hit FR burst limit */
10054			return;
10055		}
10056		if ((num_out == 0) && (ret == 0)) {
10057			/* No more retrans to send */
10058			break;
10059		}
10060	}
10061#ifdef SCTP_AUDITING_ENABLED
10062	sctp_auditing(12, inp, stcb, NULL);
10063#endif
10064	/* Check for bad destinations, if they exist move chunks around. */
10065	TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
10066		if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
10067			/*-
10068			 * if possible move things off of this address we
10069			 * still may send below due to the dormant state but
10070			 * we try to find an alternate address to send to
10071			 * and if we have one we move all queued data on the
10072			 * out wheel to this alternate address.
10073			 */
10074			if (net->ref_count > 1)
10075				sctp_move_chunks_from_net(stcb, net);
10076		} else {
10077			/*-
10078			 * if ((asoc->sat_network) || (net->addr_is_local))
10079			 * { burst_limit = asoc->max_burst *
10080			 * SCTP_SAT_NETWORK_BURST_INCR; }
10081			 */
10082			if (asoc->max_burst > 0) {
10083				if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
10084					if ((net->flight_size + (asoc->max_burst * net->mtu)) < net->cwnd) {
10085						/*
10086						 * JRS - Use the congestion
10087						 * control given in the
10088						 * congestion control module
10089						 */
10090						asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, asoc->max_burst);
10091						if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10092							sctp_log_maxburst(stcb, net, 0, asoc->max_burst, SCTP_MAX_BURST_APPLIED);
10093						}
10094						SCTP_STAT_INCR(sctps_maxburstqueued);
10095					}
10096					net->fast_retran_ip = 0;
10097				} else {
10098					if (net->flight_size == 0) {
10099						/*
10100						 * Should be decaying the
10101						 * cwnd here
10102						 */
10103						;
10104					}
10105				}
10106			}
10107		}
10108
10109	}
10110	burst_cnt = 0;
10111	do {
10112		error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
10113		    &reason_code, 0, from_where,
10114		    &now, &now_filled, frag_point, so_locked);
10115		if (error) {
10116			SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
10117			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10118				sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
10119			}
10120			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10121				sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
10122				sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
10123			}
10124			break;
10125		}
10126		SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
10127
10128		tot_out += num_out;
10129		burst_cnt++;
10130		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10131			sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
10132			if (num_out == 0) {
10133				sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
10134			}
10135		}
10136		if (nagle_on) {
10137			/*
10138			 * When the Nagle algorithm is used, look at how
10139			 * much is unsent, then if its smaller than an MTU
10140			 * and we have data in flight we stop, except if we
10141			 * are handling a fragmented user message.
10142			 */
10143			un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
10144			    (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
10145			if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
10146			    (stcb->asoc.total_flight > 0) &&
10147			    ((stcb->asoc.locked_on_sending == NULL) ||
10148			    sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
10149				break;
10150			}
10151		}
10152		if (TAILQ_EMPTY(&asoc->control_send_queue) &&
10153		    TAILQ_EMPTY(&asoc->send_queue) &&
10154		    stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
10155			/* Nothing left to send */
10156			break;
10157		}
10158		if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
10159			/* Nothing left to send */
10160			break;
10161		}
10162	} while (num_out &&
10163	    ((asoc->max_burst == 0) ||
10164	    SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
10165	    (burst_cnt < asoc->max_burst)));
10166
10167	if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
10168		if ((asoc->max_burst > 0) && (burst_cnt >= asoc->max_burst)) {
10169			SCTP_STAT_INCR(sctps_maxburstqueued);
10170			asoc->burst_limit_applied = 1;
10171			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10172				sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
10173			}
10174		} else {
10175			asoc->burst_limit_applied = 0;
10176		}
10177	}
10178	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10179		sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
10180	}
10181	SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
10182	    tot_out);
10183
10184	/*-
10185	 * Now we need to clean up the control chunk chain if a ECNE is on
10186	 * it. It must be marked as UNSENT again so next call will continue
10187	 * to send it until such time that we get a CWR, to remove it.
10188	 */
10189	if (stcb->asoc.ecn_echo_cnt_onq)
10190		sctp_fix_ecn_echo(asoc);
10191	return;
10192}
10193
10194
10195int
10196sctp_output(
10197    struct sctp_inpcb *inp,
10198    struct mbuf *m,
10199    struct sockaddr *addr,
10200    struct mbuf *control,
10201    struct thread *p,
10202    int flags)
10203{
10204	if (inp == NULL) {
10205		SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10206		return (EINVAL);
10207	}
10208	if (inp->sctp_socket == NULL) {
10209		SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10210		return (EINVAL);
10211	}
10212	return (sctp_sosend(inp->sctp_socket,
10213	    addr,
10214	    (struct uio *)NULL,
10215	    m,
10216	    control,
10217	    flags, p
10218	    ));
10219}
10220
10221void
10222send_forward_tsn(struct sctp_tcb *stcb,
10223    struct sctp_association *asoc)
10224{
10225	struct sctp_tmit_chunk *chk;
10226	struct sctp_forward_tsn_chunk *fwdtsn;
10227	uint32_t advance_peer_ack_point;
10228
10229	SCTP_TCB_LOCK_ASSERT(stcb);
10230	TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10231		if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
10232			/* mark it to unsent */
10233			chk->sent = SCTP_DATAGRAM_UNSENT;
10234			chk->snd_count = 0;
10235			/* Do we correct its output location? */
10236			if (chk->whoTo) {
10237				sctp_free_remote_addr(chk->whoTo);
10238				chk->whoTo = NULL;
10239			}
10240			goto sctp_fill_in_rest;
10241		}
10242	}
10243	/* Ok if we reach here we must build one */
10244	sctp_alloc_a_chunk(stcb, chk);
10245	if (chk == NULL) {
10246		return;
10247	}
10248	asoc->fwd_tsn_cnt++;
10249	chk->copy_by_ref = 0;
10250	chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
10251	chk->rec.chunk_id.can_take_data = 0;
10252	chk->asoc = asoc;
10253	chk->whoTo = NULL;
10254	chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
10255	if (chk->data == NULL) {
10256		sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
10257		return;
10258	}
10259	SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10260	chk->sent = SCTP_DATAGRAM_UNSENT;
10261	chk->snd_count = 0;
10262	TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
10263	asoc->ctrl_queue_cnt++;
10264sctp_fill_in_rest:
10265	/*-
10266	 * Here we go through and fill out the part that deals with
10267	 * stream/seq of the ones we skip.
10268	 */
10269	SCTP_BUF_LEN(chk->data) = 0;
10270	{
10271		struct sctp_tmit_chunk *at, *tp1, *last;
10272		struct sctp_strseq *strseq;
10273		unsigned int cnt_of_space, i, ovh;
10274		unsigned int space_needed;
10275		unsigned int cnt_of_skipped = 0;
10276
10277		TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10278			if ((at->sent != SCTP_FORWARD_TSN_SKIP) &&
10279			    (at->sent != SCTP_DATAGRAM_NR_ACKED)) {
10280				/* no more to look at */
10281				break;
10282			}
10283			if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10284				/* We don't report these */
10285				continue;
10286			}
10287			cnt_of_skipped++;
10288		}
10289		space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10290		    (cnt_of_skipped * sizeof(struct sctp_strseq)));
10291
10292		cnt_of_space = M_TRAILINGSPACE(chk->data);
10293
10294		if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
10295			ovh = SCTP_MIN_OVERHEAD;
10296		} else {
10297			ovh = SCTP_MIN_V4_OVERHEAD;
10298		}
10299		if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
10300			/* trim to a mtu size */
10301			cnt_of_space = asoc->smallest_mtu - ovh;
10302		}
10303		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10304			sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10305			    0xff, 0, cnt_of_skipped,
10306			    asoc->advanced_peer_ack_point);
10307
10308		}
10309		advance_peer_ack_point = asoc->advanced_peer_ack_point;
10310		if (cnt_of_space < space_needed) {
10311			/*-
10312			 * ok we must trim down the chunk by lowering the
10313			 * advance peer ack point.
10314			 */
10315			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10316				sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10317				    0xff, 0xff, cnt_of_space,
10318				    space_needed);
10319			}
10320			cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
10321			cnt_of_skipped /= sizeof(struct sctp_strseq);
10322			/*-
10323			 * Go through and find the TSN that will be the one
10324			 * we report.
10325			 */
10326			at = TAILQ_FIRST(&asoc->sent_queue);
10327			if (at != NULL) {
10328				for (i = 0; i < cnt_of_skipped; i++) {
10329					tp1 = TAILQ_NEXT(at, sctp_next);
10330					if (tp1 == NULL) {
10331						break;
10332					}
10333					at = tp1;
10334				}
10335			}
10336			if (at && SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10337				sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10338				    0xff, cnt_of_skipped, at->rec.data.TSN_seq,
10339				    asoc->advanced_peer_ack_point);
10340			}
10341			last = at;
10342			/*-
10343			 * last now points to last one I can report, update
10344			 * peer ack point
10345			 */
10346			if (last)
10347				advance_peer_ack_point = last->rec.data.TSN_seq;
10348			space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10349			    cnt_of_skipped * sizeof(struct sctp_strseq);
10350		}
10351		chk->send_size = space_needed;
10352		/* Setup the chunk */
10353		fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
10354		fwdtsn->ch.chunk_length = htons(chk->send_size);
10355		fwdtsn->ch.chunk_flags = 0;
10356		fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
10357		fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
10358		SCTP_BUF_LEN(chk->data) = chk->send_size;
10359		fwdtsn++;
10360		/*-
10361		 * Move pointer to after the fwdtsn and transfer to the
10362		 * strseq pointer.
10363		 */
10364		strseq = (struct sctp_strseq *)fwdtsn;
10365		/*-
10366		 * Now populate the strseq list. This is done blindly
10367		 * without pulling out duplicate stream info. This is
10368		 * inefficent but won't harm the process since the peer will
10369		 * look at these in sequence and will thus release anything.
10370		 * It could mean we exceed the PMTU and chop off some that
10371		 * we could have included.. but this is unlikely (aka 1432/4
10372		 * would mean 300+ stream seq's would have to be reported in
10373		 * one FWD-TSN. With a bit of work we can later FIX this to
10374		 * optimize and pull out duplcates.. but it does add more
10375		 * overhead. So for now... not!
10376		 */
10377		at = TAILQ_FIRST(&asoc->sent_queue);
10378		for (i = 0; i < cnt_of_skipped; i++) {
10379			tp1 = TAILQ_NEXT(at, sctp_next);
10380			if (tp1 == NULL)
10381				break;
10382			if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10383				/* We don't report these */
10384				i--;
10385				at = tp1;
10386				continue;
10387			}
10388			if (at->rec.data.TSN_seq == advance_peer_ack_point) {
10389				at->rec.data.fwd_tsn_cnt = 0;
10390			}
10391			strseq->stream = ntohs(at->rec.data.stream_number);
10392			strseq->sequence = ntohs(at->rec.data.stream_seq);
10393			strseq++;
10394			at = tp1;
10395		}
10396	}
10397	return;
10398}
10399
10400void
10401sctp_send_sack(struct sctp_tcb *stcb, int so_locked
10402#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10403    SCTP_UNUSED
10404#endif
10405)
10406{
10407	/*-
10408	 * Queue up a SACK or NR-SACK in the control queue.
10409	 * We must first check to see if a SACK or NR-SACK is
10410	 * somehow on the control queue.
10411	 * If so, we will take and and remove the old one.
10412	 */
10413	struct sctp_association *asoc;
10414	struct sctp_tmit_chunk *chk, *a_chk;
10415	struct sctp_sack_chunk *sack;
10416	struct sctp_nr_sack_chunk *nr_sack;
10417	struct sctp_gap_ack_block *gap_descriptor;
10418	struct sack_track *selector;
10419	int mergeable = 0;
10420	int offset;
10421	caddr_t limit;
10422	uint32_t *dup;
10423	int limit_reached = 0;
10424	unsigned int i, siz, j;
10425	unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
10426	int num_dups = 0;
10427	int space_req;
10428	uint32_t highest_tsn;
10429	uint8_t flags;
10430	uint8_t type;
10431	uint8_t tsn_map;
10432
10433	if (stcb->asoc.nrsack_supported == 1) {
10434		type = SCTP_NR_SELECTIVE_ACK;
10435	} else {
10436		type = SCTP_SELECTIVE_ACK;
10437	}
10438	a_chk = NULL;
10439	asoc = &stcb->asoc;
10440	SCTP_TCB_LOCK_ASSERT(stcb);
10441	if (asoc->last_data_chunk_from == NULL) {
10442		/* Hmm we never received anything */
10443		return;
10444	}
10445	sctp_slide_mapping_arrays(stcb);
10446	sctp_set_rwnd(stcb, asoc);
10447	TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10448		if (chk->rec.chunk_id.id == type) {
10449			/* Hmm, found a sack already on queue, remove it */
10450			TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
10451			asoc->ctrl_queue_cnt--;
10452			a_chk = chk;
10453			if (a_chk->data) {
10454				sctp_m_freem(a_chk->data);
10455				a_chk->data = NULL;
10456			}
10457			if (a_chk->whoTo) {
10458				sctp_free_remote_addr(a_chk->whoTo);
10459				a_chk->whoTo = NULL;
10460			}
10461			break;
10462		}
10463	}
10464	if (a_chk == NULL) {
10465		sctp_alloc_a_chunk(stcb, a_chk);
10466		if (a_chk == NULL) {
10467			/* No memory so we drop the idea, and set a timer */
10468			if (stcb->asoc.delayed_ack) {
10469				sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10470				    stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
10471				sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10472				    stcb->sctp_ep, stcb, NULL);
10473			} else {
10474				stcb->asoc.send_sack = 1;
10475			}
10476			return;
10477		}
10478		a_chk->copy_by_ref = 0;
10479		a_chk->rec.chunk_id.id = type;
10480		a_chk->rec.chunk_id.can_take_data = 1;
10481	}
10482	/* Clear our pkt counts */
10483	asoc->data_pkts_seen = 0;
10484
10485	a_chk->asoc = asoc;
10486	a_chk->snd_count = 0;
10487	a_chk->send_size = 0;	/* fill in later */
10488	a_chk->sent = SCTP_DATAGRAM_UNSENT;
10489	a_chk->whoTo = NULL;
10490
10491	if ((asoc->numduptsns) ||
10492	    (!(asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE))) {
10493		/*-
10494		 * Ok, we have some duplicates or the destination for the
10495		 * sack is unreachable, lets see if we can select an
10496		 * alternate than asoc->last_data_chunk_from
10497		 */
10498		if ((asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE) &&
10499		    (asoc->used_alt_onsack > asoc->numnets)) {
10500			/* We used an alt last time, don't this time */
10501			a_chk->whoTo = NULL;
10502		} else {
10503			asoc->used_alt_onsack++;
10504			a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
10505		}
10506		if (a_chk->whoTo == NULL) {
10507			/* Nope, no alternate */
10508			a_chk->whoTo = asoc->last_data_chunk_from;
10509			asoc->used_alt_onsack = 0;
10510		}
10511	} else {
10512		/*
10513		 * No duplicates so we use the last place we received data
10514		 * from.
10515		 */
10516		asoc->used_alt_onsack = 0;
10517		a_chk->whoTo = asoc->last_data_chunk_from;
10518	}
10519	if (a_chk->whoTo) {
10520		atomic_add_int(&a_chk->whoTo->ref_count, 1);
10521	}
10522	if (SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->highest_tsn_inside_nr_map)) {
10523		highest_tsn = asoc->highest_tsn_inside_map;
10524	} else {
10525		highest_tsn = asoc->highest_tsn_inside_nr_map;
10526	}
10527	if (highest_tsn == asoc->cumulative_tsn) {
10528		/* no gaps */
10529		if (type == SCTP_SELECTIVE_ACK) {
10530			space_req = sizeof(struct sctp_sack_chunk);
10531		} else {
10532			space_req = sizeof(struct sctp_nr_sack_chunk);
10533		}
10534	} else {
10535		/* gaps get a cluster */
10536		space_req = MCLBYTES;
10537	}
10538	/* Ok now lets formulate a MBUF with our sack */
10539	a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_NOWAIT, 1, MT_DATA);
10540	if ((a_chk->data == NULL) ||
10541	    (a_chk->whoTo == NULL)) {
10542		/* rats, no mbuf memory */
10543		if (a_chk->data) {
10544			/* was a problem with the destination */
10545			sctp_m_freem(a_chk->data);
10546			a_chk->data = NULL;
10547		}
10548		sctp_free_a_chunk(stcb, a_chk, so_locked);
10549		/* sa_ignore NO_NULL_CHK */
10550		if (stcb->asoc.delayed_ack) {
10551			sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10552			    stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_6);
10553			sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10554			    stcb->sctp_ep, stcb, NULL);
10555		} else {
10556			stcb->asoc.send_sack = 1;
10557		}
10558		return;
10559	}
10560	/* ok, lets go through and fill it in */
10561	SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10562	space = M_TRAILINGSPACE(a_chk->data);
10563	if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10564		space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10565	}
10566	limit = mtod(a_chk->data, caddr_t);
10567	limit += space;
10568
10569	flags = 0;
10570
10571	if ((asoc->sctp_cmt_on_off > 0) &&
10572	    SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10573		/*-
10574		 * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10575		 * received, then set high bit to 1, else 0. Reset
10576		 * pkts_rcvd.
10577		 */
10578		flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10579		asoc->cmt_dac_pkts_rcvd = 0;
10580	}
10581#ifdef SCTP_ASOCLOG_OF_TSNS
10582	stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10583	stcb->asoc.cumack_log_atsnt++;
10584	if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10585		stcb->asoc.cumack_log_atsnt = 0;
10586	}
10587#endif
10588	/* reset the readers interpretation */
10589	stcb->freed_by_sorcv_sincelast = 0;
10590
10591	if (type == SCTP_SELECTIVE_ACK) {
10592		sack = mtod(a_chk->data, struct sctp_sack_chunk *);
10593		nr_sack = NULL;
10594		gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
10595		if (highest_tsn > asoc->mapping_array_base_tsn) {
10596			siz = (((highest_tsn - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10597		} else {
10598			siz = (((MAX_TSN - highest_tsn) + 1) + highest_tsn + 7) / 8;
10599		}
10600	} else {
10601		sack = NULL;
10602		nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
10603		gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
10604		if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn) {
10605			siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10606		} else {
10607			siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10608		}
10609	}
10610
10611	if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10612		offset = 1;
10613	} else {
10614		offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10615	}
10616	if (((type == SCTP_SELECTIVE_ACK) &&
10617	    SCTP_TSN_GT(highest_tsn, asoc->cumulative_tsn)) ||
10618	    ((type == SCTP_NR_SELECTIVE_ACK) &&
10619	    SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->cumulative_tsn))) {
10620		/* we have a gap .. maybe */
10621		for (i = 0; i < siz; i++) {
10622			tsn_map = asoc->mapping_array[i];
10623			if (type == SCTP_SELECTIVE_ACK) {
10624				tsn_map |= asoc->nr_mapping_array[i];
10625			}
10626			if (i == 0) {
10627				/*
10628				 * Clear all bits corresponding to TSNs
10629				 * smaller or equal to the 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 ok to
10637				 * merge.
10638				 */
10639				num_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 setting
10649						 * the left side
10650						 */
10651						mergeable = 0;
10652					} else {
10653						/*
10654						 * no merge, set the left
10655						 * side
10656						 */
10657						mergeable = 0;
10658						gap_descriptor->start = htons((selector->gaps[j].start + offset));
10659					}
10660					gap_descriptor->end = htons((selector->gaps[j].end + offset));
10661					num_gap_blocks++;
10662					gap_descriptor++;
10663					if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10664						/* no more room */
10665						limit_reached = 1;
10666						break;
10667					}
10668				}
10669				if (selector->left_edge) {
10670					mergeable = 1;
10671				}
10672			}
10673			if (limit_reached) {
10674				/* Reached the limit stop */
10675				break;
10676			}
10677			offset += 8;
10678		}
10679	}
10680	if ((type == SCTP_NR_SELECTIVE_ACK) &&
10681	    (limit_reached == 0)) {
10682
10683		mergeable = 0;
10684
10685		if (asoc->highest_tsn_inside_nr_map > asoc->mapping_array_base_tsn) {
10686			siz = (((asoc->highest_tsn_inside_nr_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10687		} else {
10688			siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10689		}
10690
10691		if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10692			offset = 1;
10693		} else {
10694			offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10695		}
10696		if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn)) {
10697			/* we have a gap .. maybe */
10698			for (i = 0; i < siz; i++) {
10699				tsn_map = asoc->nr_mapping_array[i];
10700				if (i == 0) {
10701					/*
10702					 * Clear all bits corresponding to
10703					 * TSNs smaller or equal to the
10704					 * cumulative TSN.
10705					 */
10706					tsn_map &= (~0 << (1 - offset));
10707				}
10708				selector = &sack_array[tsn_map];
10709				if (mergeable && selector->right_edge) {
10710					/*
10711					 * Backup, left and right edges were
10712					 * ok to merge.
10713					 */
10714					num_nr_gap_blocks--;
10715					gap_descriptor--;
10716				}
10717				if (selector->num_entries == 0)
10718					mergeable = 0;
10719				else {
10720					for (j = 0; j < selector->num_entries; j++) {
10721						if (mergeable && selector->right_edge) {
10722							/*
10723							 * do a merge by NOT
10724							 * setting the left
10725							 * side
10726							 */
10727							mergeable = 0;
10728						} else {
10729							/*
10730							 * no merge, set the
10731							 * left side
10732							 */
10733							mergeable = 0;
10734							gap_descriptor->start = htons((selector->gaps[j].start + offset));
10735						}
10736						gap_descriptor->end = htons((selector->gaps[j].end + offset));
10737						num_nr_gap_blocks++;
10738						gap_descriptor++;
10739						if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10740							/* no more room */
10741							limit_reached = 1;
10742							break;
10743						}
10744					}
10745					if (selector->left_edge) {
10746						mergeable = 1;
10747					}
10748				}
10749				if (limit_reached) {
10750					/* Reached the limit stop */
10751					break;
10752				}
10753				offset += 8;
10754			}
10755		}
10756	}
10757	/* now we must add any dups we are going to report. */
10758	if ((limit_reached == 0) && (asoc->numduptsns)) {
10759		dup = (uint32_t *) gap_descriptor;
10760		for (i = 0; i < asoc->numduptsns; i++) {
10761			*dup = htonl(asoc->dup_tsns[i]);
10762			dup++;
10763			num_dups++;
10764			if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10765				/* no more room */
10766				break;
10767			}
10768		}
10769		asoc->numduptsns = 0;
10770	}
10771	/*
10772	 * now that the chunk is prepared queue it to the control chunk
10773	 * queue.
10774	 */
10775	if (type == SCTP_SELECTIVE_ACK) {
10776		a_chk->send_size = sizeof(struct sctp_sack_chunk) +
10777		    (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10778		    num_dups * sizeof(int32_t);
10779		SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10780		sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10781		sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10782		sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10783		sack->sack.num_dup_tsns = htons(num_dups);
10784		sack->ch.chunk_type = type;
10785		sack->ch.chunk_flags = flags;
10786		sack->ch.chunk_length = htons(a_chk->send_size);
10787	} else {
10788		a_chk->send_size = sizeof(struct sctp_nr_sack_chunk) +
10789		    (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10790		    num_dups * sizeof(int32_t);
10791		SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10792		nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10793		nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10794		nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10795		nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10796		nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10797		nr_sack->nr_sack.reserved = 0;
10798		nr_sack->ch.chunk_type = type;
10799		nr_sack->ch.chunk_flags = flags;
10800		nr_sack->ch.chunk_length = htons(a_chk->send_size);
10801	}
10802	TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10803	asoc->my_last_reported_rwnd = asoc->my_rwnd;
10804	asoc->ctrl_queue_cnt++;
10805	asoc->send_sack = 0;
10806	SCTP_STAT_INCR(sctps_sendsacks);
10807	return;
10808}
10809
10810void
10811sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked
10812#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10813    SCTP_UNUSED
10814#endif
10815)
10816{
10817	struct mbuf *m_abort, *m, *m_last;
10818	struct mbuf *m_out, *m_end = NULL;
10819	struct sctp_abort_chunk *abort;
10820	struct sctp_auth_chunk *auth = NULL;
10821	struct sctp_nets *net;
10822	uint32_t vtag;
10823	uint32_t auth_offset = 0;
10824	uint16_t cause_len, chunk_len, padding_len;
10825
10826	SCTP_TCB_LOCK_ASSERT(stcb);
10827	/*-
10828	 * Add an AUTH chunk, if chunk requires it and save the offset into
10829	 * the chain for AUTH
10830	 */
10831	if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10832	    stcb->asoc.peer_auth_chunks)) {
10833		m_out = sctp_add_auth_chunk(NULL, &m_end, &auth, &auth_offset,
10834		    stcb, SCTP_ABORT_ASSOCIATION);
10835		SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10836	} else {
10837		m_out = NULL;
10838	}
10839	m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_NOWAIT, 1, MT_HEADER);
10840	if (m_abort == NULL) {
10841		if (m_out) {
10842			sctp_m_freem(m_out);
10843		}
10844		if (operr) {
10845			sctp_m_freem(operr);
10846		}
10847		return;
10848	}
10849	/* link in any error */
10850	SCTP_BUF_NEXT(m_abort) = operr;
10851	cause_len = 0;
10852	m_last = NULL;
10853	for (m = operr; m; m = SCTP_BUF_NEXT(m)) {
10854		cause_len += (uint16_t) SCTP_BUF_LEN(m);
10855		if (SCTP_BUF_NEXT(m) == NULL) {
10856			m_last = m;
10857		}
10858	}
10859	SCTP_BUF_LEN(m_abort) = sizeof(struct sctp_abort_chunk);
10860	chunk_len = (uint16_t) sizeof(struct sctp_abort_chunk) + cause_len;
10861	padding_len = SCTP_SIZE32(chunk_len) - chunk_len;
10862	if (m_out == NULL) {
10863		/* NO Auth chunk prepended, so reserve space in front */
10864		SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10865		m_out = m_abort;
10866	} else {
10867		/* Put AUTH chunk at the front of the chain */
10868		SCTP_BUF_NEXT(m_end) = m_abort;
10869	}
10870	if (stcb->asoc.alternate) {
10871		net = stcb->asoc.alternate;
10872	} else {
10873		net = stcb->asoc.primary_destination;
10874	}
10875	/* Fill in the ABORT chunk header. */
10876	abort = mtod(m_abort, struct sctp_abort_chunk *);
10877	abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10878	if (stcb->asoc.peer_vtag == 0) {
10879		/* This happens iff the assoc is in COOKIE-WAIT state. */
10880		vtag = stcb->asoc.my_vtag;
10881		abort->ch.chunk_flags = SCTP_HAD_NO_TCB;
10882	} else {
10883		vtag = stcb->asoc.peer_vtag;
10884		abort->ch.chunk_flags = 0;
10885	}
10886	abort->ch.chunk_length = htons(chunk_len);
10887	/* Add padding, if necessary. */
10888	if (padding_len > 0) {
10889		if ((m_last == NULL) ||
10890		    (sctp_add_pad_tombuf(m_last, padding_len) == NULL)) {
10891			sctp_m_freem(m_out);
10892			return;
10893		}
10894	}
10895	(void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10896	    (struct sockaddr *)&net->ro._l_addr,
10897	    m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, 0,
10898	    stcb->sctp_ep->sctp_lport, stcb->rport, htonl(vtag),
10899	    stcb->asoc.primary_destination->port, NULL,
10900	    0, 0,
10901	    so_locked);
10902	SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10903}
10904
10905void
10906sctp_send_shutdown_complete(struct sctp_tcb *stcb,
10907    struct sctp_nets *net,
10908    int reflect_vtag)
10909{
10910	/* formulate and SEND a SHUTDOWN-COMPLETE */
10911	struct mbuf *m_shutdown_comp;
10912	struct sctp_shutdown_complete_chunk *shutdown_complete;
10913	uint32_t vtag;
10914	uint8_t flags;
10915
10916	m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
10917	if (m_shutdown_comp == NULL) {
10918		/* no mbuf's */
10919		return;
10920	}
10921	if (reflect_vtag) {
10922		flags = SCTP_HAD_NO_TCB;
10923		vtag = stcb->asoc.my_vtag;
10924	} else {
10925		flags = 0;
10926		vtag = stcb->asoc.peer_vtag;
10927	}
10928	shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
10929	shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
10930	shutdown_complete->ch.chunk_flags = flags;
10931	shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
10932	SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
10933	(void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10934	    (struct sockaddr *)&net->ro._l_addr,
10935	    m_shutdown_comp, 0, NULL, 0, 1, 0, 0,
10936	    stcb->sctp_ep->sctp_lport, stcb->rport,
10937	    htonl(vtag),
10938	    net->port, NULL,
10939	    0, 0,
10940	    SCTP_SO_NOT_LOCKED);
10941	SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10942	return;
10943}
10944
10945static void
10946sctp_send_resp_msg(struct sockaddr *src, struct sockaddr *dst,
10947    struct sctphdr *sh, uint32_t vtag,
10948    uint8_t type, struct mbuf *cause,
10949    uint8_t use_mflowid, uint32_t mflowid,
10950    uint32_t vrf_id, uint16_t port)
10951{
10952	struct mbuf *o_pak;
10953	struct mbuf *mout;
10954	struct sctphdr *shout;
10955	struct sctp_chunkhdr *ch;
10956
10957#if defined(INET) || defined(INET6)
10958	struct udphdr *udp;
10959	int ret;
10960
10961#endif
10962	int len, cause_len, padding_len;
10963
10964#ifdef INET
10965	struct sockaddr_in *src_sin, *dst_sin;
10966	struct ip *ip;
10967
10968#endif
10969#ifdef INET6
10970	struct sockaddr_in6 *src_sin6, *dst_sin6;
10971	struct ip6_hdr *ip6;
10972
10973#endif
10974
10975	/* Compute the length of the cause and add final padding. */
10976	cause_len = 0;
10977	if (cause != NULL) {
10978		struct mbuf *m_at, *m_last = NULL;
10979
10980		for (m_at = cause; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
10981			if (SCTP_BUF_NEXT(m_at) == NULL)
10982				m_last = m_at;
10983			cause_len += SCTP_BUF_LEN(m_at);
10984		}
10985		padding_len = cause_len % 4;
10986		if (padding_len != 0) {
10987			padding_len = 4 - padding_len;
10988		}
10989		if (padding_len != 0) {
10990			if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
10991				sctp_m_freem(cause);
10992				return;
10993			}
10994		}
10995	} else {
10996		padding_len = 0;
10997	}
10998	/* Get an mbuf for the header. */
10999	len = sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
11000	switch (dst->sa_family) {
11001#ifdef INET
11002	case AF_INET:
11003		len += sizeof(struct ip);
11004		break;
11005#endif
11006#ifdef INET6
11007	case AF_INET6:
11008		len += sizeof(struct ip6_hdr);
11009		break;
11010#endif
11011	default:
11012		break;
11013	}
11014#if defined(INET) || defined(INET6)
11015	if (port) {
11016		len += sizeof(struct udphdr);
11017	}
11018#endif
11019	mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_NOWAIT, 1, MT_DATA);
11020	if (mout == NULL) {
11021		if (cause) {
11022			sctp_m_freem(cause);
11023		}
11024		return;
11025	}
11026	SCTP_BUF_RESV_UF(mout, max_linkhdr);
11027	SCTP_BUF_LEN(mout) = len;
11028	SCTP_BUF_NEXT(mout) = cause;
11029	if (use_mflowid != 0) {
11030		mout->m_pkthdr.flowid = mflowid;
11031		mout->m_flags |= M_FLOWID;
11032	}
11033#ifdef INET
11034	ip = NULL;
11035#endif
11036#ifdef INET6
11037	ip6 = NULL;
11038#endif
11039	switch (dst->sa_family) {
11040#ifdef INET
11041	case AF_INET:
11042		src_sin = (struct sockaddr_in *)src;
11043		dst_sin = (struct sockaddr_in *)dst;
11044		ip = mtod(mout, struct ip *);
11045		ip->ip_v = IPVERSION;
11046		ip->ip_hl = (sizeof(struct ip) >> 2);
11047		ip->ip_tos = 0;
11048		ip->ip_id = ip_newid();
11049		ip->ip_off = 0;
11050		ip->ip_ttl = MODULE_GLOBAL(ip_defttl);
11051		if (port) {
11052			ip->ip_p = IPPROTO_UDP;
11053		} else {
11054			ip->ip_p = IPPROTO_SCTP;
11055		}
11056		ip->ip_src.s_addr = dst_sin->sin_addr.s_addr;
11057		ip->ip_dst.s_addr = src_sin->sin_addr.s_addr;
11058		ip->ip_sum = 0;
11059		len = sizeof(struct ip);
11060		shout = (struct sctphdr *)((caddr_t)ip + len);
11061		break;
11062#endif
11063#ifdef INET6
11064	case AF_INET6:
11065		src_sin6 = (struct sockaddr_in6 *)src;
11066		dst_sin6 = (struct sockaddr_in6 *)dst;
11067		ip6 = mtod(mout, struct ip6_hdr *);
11068		ip6->ip6_flow = htonl(0x60000000);
11069		if (V_ip6_auto_flowlabel) {
11070			ip6->ip6_flow |= (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
11071		}
11072		ip6->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
11073		if (port) {
11074			ip6->ip6_nxt = IPPROTO_UDP;
11075		} else {
11076			ip6->ip6_nxt = IPPROTO_SCTP;
11077		}
11078		ip6->ip6_src = dst_sin6->sin6_addr;
11079		ip6->ip6_dst = src_sin6->sin6_addr;
11080		len = sizeof(struct ip6_hdr);
11081		shout = (struct sctphdr *)((caddr_t)ip6 + len);
11082		break;
11083#endif
11084	default:
11085		len = 0;
11086		shout = mtod(mout, struct sctphdr *);
11087		break;
11088	}
11089#if defined(INET) || defined(INET6)
11090	if (port) {
11091		if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
11092			sctp_m_freem(mout);
11093			return;
11094		}
11095		udp = (struct udphdr *)shout;
11096		udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
11097		udp->uh_dport = port;
11098		udp->uh_sum = 0;
11099		udp->uh_ulen = htons(sizeof(struct udphdr) +
11100		    sizeof(struct sctphdr) +
11101		    sizeof(struct sctp_chunkhdr) +
11102		    cause_len + padding_len);
11103		len += sizeof(struct udphdr);
11104		shout = (struct sctphdr *)((caddr_t)shout + sizeof(struct udphdr));
11105	} else {
11106		udp = NULL;
11107	}
11108#endif
11109	shout->src_port = sh->dest_port;
11110	shout->dest_port = sh->src_port;
11111	shout->checksum = 0;
11112	if (vtag) {
11113		shout->v_tag = htonl(vtag);
11114	} else {
11115		shout->v_tag = sh->v_tag;
11116	}
11117	len += sizeof(struct sctphdr);
11118	ch = (struct sctp_chunkhdr *)((caddr_t)shout + sizeof(struct sctphdr));
11119	ch->chunk_type = type;
11120	if (vtag) {
11121		ch->chunk_flags = 0;
11122	} else {
11123		ch->chunk_flags = SCTP_HAD_NO_TCB;
11124	}
11125	ch->chunk_length = htons(sizeof(struct sctp_chunkhdr) + cause_len);
11126	len += sizeof(struct sctp_chunkhdr);
11127	len += cause_len + padding_len;
11128
11129	if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
11130		sctp_m_freem(mout);
11131		return;
11132	}
11133	SCTP_ATTACH_CHAIN(o_pak, mout, len);
11134	switch (dst->sa_family) {
11135#ifdef INET
11136	case AF_INET:
11137		if (port) {
11138			if (V_udp_cksum) {
11139				udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
11140			} else {
11141				udp->uh_sum = 0;
11142			}
11143		}
11144		ip->ip_len = htons(len);
11145		if (port) {
11146#if defined(SCTP_WITH_NO_CSUM)
11147			SCTP_STAT_INCR(sctps_sendnocrc);
11148#else
11149			shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip) + sizeof(struct udphdr));
11150			SCTP_STAT_INCR(sctps_sendswcrc);
11151#endif
11152			if (V_udp_cksum) {
11153				SCTP_ENABLE_UDP_CSUM(o_pak);
11154			}
11155		} else {
11156#if defined(SCTP_WITH_NO_CSUM)
11157			SCTP_STAT_INCR(sctps_sendnocrc);
11158#else
11159			mout->m_pkthdr.csum_flags = CSUM_SCTP;
11160			mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11161			SCTP_STAT_INCR(sctps_sendhwcrc);
11162#endif
11163		}
11164#ifdef SCTP_PACKET_LOGGING
11165		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11166			sctp_packet_log(o_pak);
11167		}
11168#endif
11169		SCTP_IP_OUTPUT(ret, o_pak, NULL, NULL, vrf_id);
11170		break;
11171#endif
11172#ifdef INET6
11173	case AF_INET6:
11174		ip6->ip6_plen = len - sizeof(struct ip6_hdr);
11175		if (port) {
11176#if defined(SCTP_WITH_NO_CSUM)
11177			SCTP_STAT_INCR(sctps_sendnocrc);
11178#else
11179			shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11180			SCTP_STAT_INCR(sctps_sendswcrc);
11181#endif
11182			if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11183				udp->uh_sum = 0xffff;
11184			}
11185		} else {
11186#if defined(SCTP_WITH_NO_CSUM)
11187			SCTP_STAT_INCR(sctps_sendnocrc);
11188#else
11189			mout->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
11190			mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11191			SCTP_STAT_INCR(sctps_sendhwcrc);
11192#endif
11193		}
11194#ifdef SCTP_PACKET_LOGGING
11195		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11196			sctp_packet_log(o_pak);
11197		}
11198#endif
11199		SCTP_IP6_OUTPUT(ret, o_pak, NULL, NULL, NULL, vrf_id);
11200		break;
11201#endif
11202	default:
11203		SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
11204		    dst->sa_family);
11205		sctp_m_freem(mout);
11206		SCTP_LTRACE_ERR_RET_PKT(mout, NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11207		return;
11208	}
11209	SCTP_STAT_INCR(sctps_sendpackets);
11210	SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11211	SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11212	return;
11213}
11214
11215void
11216sctp_send_shutdown_complete2(struct sockaddr *src, struct sockaddr *dst,
11217    struct sctphdr *sh,
11218    uint8_t use_mflowid, uint32_t mflowid,
11219    uint32_t vrf_id, uint16_t port)
11220{
11221	sctp_send_resp_msg(src, dst, sh, 0, SCTP_SHUTDOWN_COMPLETE, NULL,
11222	    use_mflowid, mflowid,
11223	    vrf_id, port);
11224}
11225
11226void
11227sctp_send_hb(struct sctp_tcb *stcb, struct sctp_nets *net, int so_locked
11228#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
11229    SCTP_UNUSED
11230#endif
11231)
11232{
11233	struct sctp_tmit_chunk *chk;
11234	struct sctp_heartbeat_chunk *hb;
11235	struct timeval now;
11236
11237	SCTP_TCB_LOCK_ASSERT(stcb);
11238	if (net == NULL) {
11239		return;
11240	}
11241	(void)SCTP_GETTIME_TIMEVAL(&now);
11242	switch (net->ro._l_addr.sa.sa_family) {
11243#ifdef INET
11244	case AF_INET:
11245		break;
11246#endif
11247#ifdef INET6
11248	case AF_INET6:
11249		break;
11250#endif
11251	default:
11252		return;
11253	}
11254	sctp_alloc_a_chunk(stcb, chk);
11255	if (chk == NULL) {
11256		SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
11257		return;
11258	}
11259	chk->copy_by_ref = 0;
11260	chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
11261	chk->rec.chunk_id.can_take_data = 1;
11262	chk->asoc = &stcb->asoc;
11263	chk->send_size = sizeof(struct sctp_heartbeat_chunk);
11264
11265	chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11266	if (chk->data == NULL) {
11267		sctp_free_a_chunk(stcb, chk, so_locked);
11268		return;
11269	}
11270	SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11271	SCTP_BUF_LEN(chk->data) = chk->send_size;
11272	chk->sent = SCTP_DATAGRAM_UNSENT;
11273	chk->snd_count = 0;
11274	chk->whoTo = net;
11275	atomic_add_int(&chk->whoTo->ref_count, 1);
11276	/* Now we have a mbuf that we can fill in with the details */
11277	hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
11278	memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
11279	/* fill out chunk header */
11280	hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
11281	hb->ch.chunk_flags = 0;
11282	hb->ch.chunk_length = htons(chk->send_size);
11283	/* Fill out hb parameter */
11284	hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
11285	hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
11286	hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
11287	hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
11288	/* Did our user request this one, put it in */
11289	hb->heartbeat.hb_info.addr_family = net->ro._l_addr.sa.sa_family;
11290	hb->heartbeat.hb_info.addr_len = net->ro._l_addr.sa.sa_len;
11291	if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
11292		/*
11293		 * we only take from the entropy pool if the address is not
11294		 * confirmed.
11295		 */
11296		net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11297		net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11298	} else {
11299		net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
11300		net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
11301	}
11302	switch (net->ro._l_addr.sa.sa_family) {
11303#ifdef INET
11304	case AF_INET:
11305		memcpy(hb->heartbeat.hb_info.address,
11306		    &net->ro._l_addr.sin.sin_addr,
11307		    sizeof(net->ro._l_addr.sin.sin_addr));
11308		break;
11309#endif
11310#ifdef INET6
11311	case AF_INET6:
11312		memcpy(hb->heartbeat.hb_info.address,
11313		    &net->ro._l_addr.sin6.sin6_addr,
11314		    sizeof(net->ro._l_addr.sin6.sin6_addr));
11315		break;
11316#endif
11317	default:
11318		return;
11319		break;
11320	}
11321	net->hb_responded = 0;
11322	TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11323	stcb->asoc.ctrl_queue_cnt++;
11324	SCTP_STAT_INCR(sctps_sendheartbeat);
11325	return;
11326}
11327
11328void
11329sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
11330    uint32_t high_tsn)
11331{
11332	struct sctp_association *asoc;
11333	struct sctp_ecne_chunk *ecne;
11334	struct sctp_tmit_chunk *chk;
11335
11336	if (net == NULL) {
11337		return;
11338	}
11339	asoc = &stcb->asoc;
11340	SCTP_TCB_LOCK_ASSERT(stcb);
11341	TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11342		if ((chk->rec.chunk_id.id == SCTP_ECN_ECHO) && (net == chk->whoTo)) {
11343			/* found a previous ECN_ECHO update it if needed */
11344			uint32_t cnt, ctsn;
11345
11346			ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11347			ctsn = ntohl(ecne->tsn);
11348			if (SCTP_TSN_GT(high_tsn, ctsn)) {
11349				ecne->tsn = htonl(high_tsn);
11350				SCTP_STAT_INCR(sctps_queue_upd_ecne);
11351			}
11352			cnt = ntohl(ecne->num_pkts_since_cwr);
11353			cnt++;
11354			ecne->num_pkts_since_cwr = htonl(cnt);
11355			return;
11356		}
11357	}
11358	/* nope could not find one to update so we must build one */
11359	sctp_alloc_a_chunk(stcb, chk);
11360	if (chk == NULL) {
11361		return;
11362	}
11363	chk->copy_by_ref = 0;
11364	SCTP_STAT_INCR(sctps_queue_upd_ecne);
11365	chk->rec.chunk_id.id = SCTP_ECN_ECHO;
11366	chk->rec.chunk_id.can_take_data = 0;
11367	chk->asoc = &stcb->asoc;
11368	chk->send_size = sizeof(struct sctp_ecne_chunk);
11369	chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11370	if (chk->data == NULL) {
11371		sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11372		return;
11373	}
11374	SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11375	SCTP_BUF_LEN(chk->data) = chk->send_size;
11376	chk->sent = SCTP_DATAGRAM_UNSENT;
11377	chk->snd_count = 0;
11378	chk->whoTo = net;
11379	atomic_add_int(&chk->whoTo->ref_count, 1);
11380
11381	stcb->asoc.ecn_echo_cnt_onq++;
11382	ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11383	ecne->ch.chunk_type = SCTP_ECN_ECHO;
11384	ecne->ch.chunk_flags = 0;
11385	ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
11386	ecne->tsn = htonl(high_tsn);
11387	ecne->num_pkts_since_cwr = htonl(1);
11388	TAILQ_INSERT_HEAD(&stcb->asoc.control_send_queue, chk, sctp_next);
11389	asoc->ctrl_queue_cnt++;
11390}
11391
11392void
11393sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
11394    struct mbuf *m, int len, int iphlen, int bad_crc)
11395{
11396	struct sctp_association *asoc;
11397	struct sctp_pktdrop_chunk *drp;
11398	struct sctp_tmit_chunk *chk;
11399	uint8_t *datap;
11400	int was_trunc = 0;
11401	int fullsz = 0;
11402	long spc;
11403	int offset;
11404	struct sctp_chunkhdr *ch, chunk_buf;
11405	unsigned int chk_length;
11406
11407	if (!stcb) {
11408		return;
11409	}
11410	asoc = &stcb->asoc;
11411	SCTP_TCB_LOCK_ASSERT(stcb);
11412	if (asoc->pktdrop_supported == 0) {
11413		/*-
11414		 * peer must declare support before I send one.
11415		 */
11416		return;
11417	}
11418	if (stcb->sctp_socket == NULL) {
11419		return;
11420	}
11421	sctp_alloc_a_chunk(stcb, chk);
11422	if (chk == NULL) {
11423		return;
11424	}
11425	chk->copy_by_ref = 0;
11426	len -= iphlen;
11427	chk->send_size = len;
11428	/* Validate that we do not have an ABORT in here. */
11429	offset = iphlen + sizeof(struct sctphdr);
11430	ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11431	    sizeof(*ch), (uint8_t *) & chunk_buf);
11432	while (ch != NULL) {
11433		chk_length = ntohs(ch->chunk_length);
11434		if (chk_length < sizeof(*ch)) {
11435			/* break to abort land */
11436			break;
11437		}
11438		switch (ch->chunk_type) {
11439		case SCTP_PACKET_DROPPED:
11440		case SCTP_ABORT_ASSOCIATION:
11441		case SCTP_INITIATION_ACK:
11442			/**
11443			 * We don't respond with an PKT-DROP to an ABORT
11444			 * or PKT-DROP. We also do not respond to an
11445			 * INIT-ACK, because we can't know if the initiation
11446			 * tag is correct or not.
11447			 */
11448			sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11449			return;
11450		default:
11451			break;
11452		}
11453		offset += SCTP_SIZE32(chk_length);
11454		ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11455		    sizeof(*ch), (uint8_t *) & chunk_buf);
11456	}
11457
11458	if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
11459	    min(stcb->asoc.smallest_mtu, MCLBYTES)) {
11460		/*
11461		 * only send 1 mtu worth, trim off the excess on the end.
11462		 */
11463		fullsz = len;
11464		len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
11465		was_trunc = 1;
11466	}
11467	chk->asoc = &stcb->asoc;
11468	chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11469	if (chk->data == NULL) {
11470jump_out:
11471		sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11472		return;
11473	}
11474	SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11475	drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
11476	if (drp == NULL) {
11477		sctp_m_freem(chk->data);
11478		chk->data = NULL;
11479		goto jump_out;
11480	}
11481	chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
11482	    sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
11483	chk->book_size_scale = 0;
11484	if (was_trunc) {
11485		drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
11486		drp->trunc_len = htons(fullsz);
11487		/*
11488		 * Len is already adjusted to size minus overhead above take
11489		 * out the pkt_drop chunk itself from it.
11490		 */
11491		chk->send_size = len - sizeof(struct sctp_pktdrop_chunk);
11492		len = chk->send_size;
11493	} else {
11494		/* no truncation needed */
11495		drp->ch.chunk_flags = 0;
11496		drp->trunc_len = htons(0);
11497	}
11498	if (bad_crc) {
11499		drp->ch.chunk_flags |= SCTP_BADCRC;
11500	}
11501	chk->send_size += sizeof(struct sctp_pktdrop_chunk);
11502	SCTP_BUF_LEN(chk->data) = chk->send_size;
11503	chk->sent = SCTP_DATAGRAM_UNSENT;
11504	chk->snd_count = 0;
11505	if (net) {
11506		/* we should hit here */
11507		chk->whoTo = net;
11508		atomic_add_int(&chk->whoTo->ref_count, 1);
11509	} else {
11510		chk->whoTo = NULL;
11511	}
11512	chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
11513	chk->rec.chunk_id.can_take_data = 1;
11514	drp->ch.chunk_type = SCTP_PACKET_DROPPED;
11515	drp->ch.chunk_length = htons(chk->send_size);
11516	spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
11517	if (spc < 0) {
11518		spc = 0;
11519	}
11520	drp->bottle_bw = htonl(spc);
11521	if (asoc->my_rwnd) {
11522		drp->current_onq = htonl(asoc->size_on_reasm_queue +
11523		    asoc->size_on_all_streams +
11524		    asoc->my_rwnd_control_len +
11525		    stcb->sctp_socket->so_rcv.sb_cc);
11526	} else {
11527		/*-
11528		 * If my rwnd is 0, possibly from mbuf depletion as well as
11529		 * space used, tell the peer there is NO space aka onq == bw
11530		 */
11531		drp->current_onq = htonl(spc);
11532	}
11533	drp->reserved = 0;
11534	datap = drp->data;
11535	m_copydata(m, iphlen, len, (caddr_t)datap);
11536	TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11537	asoc->ctrl_queue_cnt++;
11538}
11539
11540void
11541sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn, uint8_t override)
11542{
11543	struct sctp_association *asoc;
11544	struct sctp_cwr_chunk *cwr;
11545	struct sctp_tmit_chunk *chk;
11546
11547	SCTP_TCB_LOCK_ASSERT(stcb);
11548	if (net == NULL) {
11549		return;
11550	}
11551	asoc = &stcb->asoc;
11552	TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11553		if ((chk->rec.chunk_id.id == SCTP_ECN_CWR) && (net == chk->whoTo)) {
11554			/*
11555			 * found a previous CWR queued to same destination
11556			 * update it if needed
11557			 */
11558			uint32_t ctsn;
11559
11560			cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11561			ctsn = ntohl(cwr->tsn);
11562			if (SCTP_TSN_GT(high_tsn, ctsn)) {
11563				cwr->tsn = htonl(high_tsn);
11564			}
11565			if (override & SCTP_CWR_REDUCE_OVERRIDE) {
11566				/* Make sure override is carried */
11567				cwr->ch.chunk_flags |= SCTP_CWR_REDUCE_OVERRIDE;
11568			}
11569			return;
11570		}
11571	}
11572	sctp_alloc_a_chunk(stcb, chk);
11573	if (chk == NULL) {
11574		return;
11575	}
11576	chk->copy_by_ref = 0;
11577	chk->rec.chunk_id.id = SCTP_ECN_CWR;
11578	chk->rec.chunk_id.can_take_data = 1;
11579	chk->asoc = &stcb->asoc;
11580	chk->send_size = sizeof(struct sctp_cwr_chunk);
11581	chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11582	if (chk->data == NULL) {
11583		sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11584		return;
11585	}
11586	SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11587	SCTP_BUF_LEN(chk->data) = chk->send_size;
11588	chk->sent = SCTP_DATAGRAM_UNSENT;
11589	chk->snd_count = 0;
11590	chk->whoTo = net;
11591	atomic_add_int(&chk->whoTo->ref_count, 1);
11592	cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11593	cwr->ch.chunk_type = SCTP_ECN_CWR;
11594	cwr->ch.chunk_flags = override;
11595	cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
11596	cwr->tsn = htonl(high_tsn);
11597	TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11598	asoc->ctrl_queue_cnt++;
11599}
11600
11601void
11602sctp_add_stream_reset_out(struct sctp_tmit_chunk *chk,
11603    int number_entries, uint16_t * list,
11604    uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
11605{
11606	uint16_t len, old_len, i;
11607	struct sctp_stream_reset_out_request *req_out;
11608	struct sctp_chunkhdr *ch;
11609
11610	ch = mtod(chk->data, struct sctp_chunkhdr *);
11611	old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11612
11613	/* get to new offset for the param. */
11614	req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
11615	/* now how long will this param be? */
11616	len = (sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
11617	req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
11618	req_out->ph.param_length = htons(len);
11619	req_out->request_seq = htonl(seq);
11620	req_out->response_seq = htonl(resp_seq);
11621	req_out->send_reset_at_tsn = htonl(last_sent);
11622	if (number_entries) {
11623		for (i = 0; i < number_entries; i++) {
11624			req_out->list_of_streams[i] = htons(list[i]);
11625		}
11626	}
11627	if (SCTP_SIZE32(len) > len) {
11628		/*-
11629		 * Need to worry about the pad we may end up adding to the
11630		 * end. This is easy since the struct is either aligned to 4
11631		 * bytes or 2 bytes off.
11632		 */
11633		req_out->list_of_streams[number_entries] = 0;
11634	}
11635	/* now fix the chunk length */
11636	ch->chunk_length = htons(len + old_len);
11637	chk->book_size = len + old_len;
11638	chk->book_size_scale = 0;
11639	chk->send_size = SCTP_SIZE32(chk->book_size);
11640	SCTP_BUF_LEN(chk->data) = chk->send_size;
11641	return;
11642}
11643
11644static void
11645sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
11646    int number_entries, uint16_t * list,
11647    uint32_t seq)
11648{
11649	uint16_t len, old_len, i;
11650	struct sctp_stream_reset_in_request *req_in;
11651	struct sctp_chunkhdr *ch;
11652
11653	ch = mtod(chk->data, struct sctp_chunkhdr *);
11654	old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11655
11656	/* get to new offset for the param. */
11657	req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
11658	/* now how long will this param be? */
11659	len = (sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
11660	req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
11661	req_in->ph.param_length = htons(len);
11662	req_in->request_seq = htonl(seq);
11663	if (number_entries) {
11664		for (i = 0; i < number_entries; i++) {
11665			req_in->list_of_streams[i] = htons(list[i]);
11666		}
11667	}
11668	if (SCTP_SIZE32(len) > len) {
11669		/*-
11670		 * Need to worry about the pad we may end up adding to the
11671		 * end. This is easy since the struct is either aligned to 4
11672		 * bytes or 2 bytes off.
11673		 */
11674		req_in->list_of_streams[number_entries] = 0;
11675	}
11676	/* now fix the chunk length */
11677	ch->chunk_length = htons(len + old_len);
11678	chk->book_size = len + old_len;
11679	chk->book_size_scale = 0;
11680	chk->send_size = SCTP_SIZE32(chk->book_size);
11681	SCTP_BUF_LEN(chk->data) = chk->send_size;
11682	return;
11683}
11684
11685static void
11686sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
11687    uint32_t seq)
11688{
11689	uint16_t len, old_len;
11690	struct sctp_stream_reset_tsn_request *req_tsn;
11691	struct sctp_chunkhdr *ch;
11692
11693	ch = mtod(chk->data, struct sctp_chunkhdr *);
11694	old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11695
11696	/* get to new offset for the param. */
11697	req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
11698	/* now how long will this param be? */
11699	len = sizeof(struct sctp_stream_reset_tsn_request);
11700	req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
11701	req_tsn->ph.param_length = htons(len);
11702	req_tsn->request_seq = htonl(seq);
11703
11704	/* now fix the chunk length */
11705	ch->chunk_length = htons(len + old_len);
11706	chk->send_size = len + old_len;
11707	chk->book_size = SCTP_SIZE32(chk->send_size);
11708	chk->book_size_scale = 0;
11709	SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11710	return;
11711}
11712
11713void
11714sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
11715    uint32_t resp_seq, uint32_t result)
11716{
11717	uint16_t len, old_len;
11718	struct sctp_stream_reset_response *resp;
11719	struct sctp_chunkhdr *ch;
11720
11721	ch = mtod(chk->data, struct sctp_chunkhdr *);
11722	old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11723
11724	/* get to new offset for the param. */
11725	resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11726	/* now how long will this param be? */
11727	len = sizeof(struct sctp_stream_reset_response);
11728	resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11729	resp->ph.param_length = htons(len);
11730	resp->response_seq = htonl(resp_seq);
11731	resp->result = ntohl(result);
11732
11733	/* now fix the chunk length */
11734	ch->chunk_length = htons(len + old_len);
11735	chk->book_size = len + old_len;
11736	chk->book_size_scale = 0;
11737	chk->send_size = SCTP_SIZE32(chk->book_size);
11738	SCTP_BUF_LEN(chk->data) = chk->send_size;
11739	return;
11740}
11741
11742void
11743sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11744    uint32_t resp_seq, uint32_t result,
11745    uint32_t send_una, uint32_t recv_next)
11746{
11747	uint16_t len, old_len;
11748	struct sctp_stream_reset_response_tsn *resp;
11749	struct sctp_chunkhdr *ch;
11750
11751	ch = mtod(chk->data, struct sctp_chunkhdr *);
11752	old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11753
11754	/* get to new offset for the param. */
11755	resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11756	/* now how long will this param be? */
11757	len = sizeof(struct sctp_stream_reset_response_tsn);
11758	resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11759	resp->ph.param_length = htons(len);
11760	resp->response_seq = htonl(resp_seq);
11761	resp->result = htonl(result);
11762	resp->senders_next_tsn = htonl(send_una);
11763	resp->receivers_next_tsn = htonl(recv_next);
11764
11765	/* now fix the chunk length */
11766	ch->chunk_length = htons(len + old_len);
11767	chk->book_size = len + old_len;
11768	chk->send_size = SCTP_SIZE32(chk->book_size);
11769	chk->book_size_scale = 0;
11770	SCTP_BUF_LEN(chk->data) = chk->send_size;
11771	return;
11772}
11773
11774static void
11775sctp_add_an_out_stream(struct sctp_tmit_chunk *chk,
11776    uint32_t seq,
11777    uint16_t adding)
11778{
11779	uint16_t len, old_len;
11780	struct sctp_chunkhdr *ch;
11781	struct sctp_stream_reset_add_strm *addstr;
11782
11783	ch = mtod(chk->data, struct sctp_chunkhdr *);
11784	old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11785
11786	/* get to new offset for the param. */
11787	addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11788	/* now how long will this param be? */
11789	len = sizeof(struct sctp_stream_reset_add_strm);
11790
11791	/* Fill it out. */
11792	addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_OUT_STREAMS);
11793	addstr->ph.param_length = htons(len);
11794	addstr->request_seq = htonl(seq);
11795	addstr->number_of_streams = htons(adding);
11796	addstr->reserved = 0;
11797
11798	/* now fix the chunk length */
11799	ch->chunk_length = htons(len + old_len);
11800	chk->send_size = len + old_len;
11801	chk->book_size = SCTP_SIZE32(chk->send_size);
11802	chk->book_size_scale = 0;
11803	SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11804	return;
11805}
11806
11807static void
11808sctp_add_an_in_stream(struct sctp_tmit_chunk *chk,
11809    uint32_t seq,
11810    uint16_t adding)
11811{
11812	uint16_t len, old_len;
11813	struct sctp_chunkhdr *ch;
11814	struct sctp_stream_reset_add_strm *addstr;
11815
11816	ch = mtod(chk->data, struct sctp_chunkhdr *);
11817	old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11818
11819	/* get to new offset for the param. */
11820	addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11821	/* now how long will this param be? */
11822	len = sizeof(struct sctp_stream_reset_add_strm);
11823	/* Fill it out. */
11824	addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_IN_STREAMS);
11825	addstr->ph.param_length = htons(len);
11826	addstr->request_seq = htonl(seq);
11827	addstr->number_of_streams = htons(adding);
11828	addstr->reserved = 0;
11829
11830	/* now fix the chunk length */
11831	ch->chunk_length = htons(len + old_len);
11832	chk->send_size = len + old_len;
11833	chk->book_size = SCTP_SIZE32(chk->send_size);
11834	chk->book_size_scale = 0;
11835	SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11836	return;
11837}
11838
11839int
11840sctp_send_str_reset_req(struct sctp_tcb *stcb,
11841    int number_entries, uint16_t * list,
11842    uint8_t send_out_req,
11843    uint8_t send_in_req,
11844    uint8_t send_tsn_req,
11845    uint8_t add_stream,
11846    uint16_t adding_o,
11847    uint16_t adding_i, uint8_t peer_asked)
11848{
11849
11850	struct sctp_association *asoc;
11851	struct sctp_tmit_chunk *chk;
11852	struct sctp_chunkhdr *ch;
11853	uint32_t seq;
11854
11855	asoc = &stcb->asoc;
11856	if (asoc->stream_reset_outstanding) {
11857		/*-
11858		 * Already one pending, must get ACK back to clear the flag.
11859		 */
11860		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
11861		return (EBUSY);
11862	}
11863	if ((send_out_req == 0) && (send_in_req == 0) && (send_tsn_req == 0) &&
11864	    (add_stream == 0)) {
11865		/* nothing to do */
11866		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11867		return (EINVAL);
11868	}
11869	if (send_tsn_req && (send_out_req || send_in_req)) {
11870		/* error, can't do that */
11871		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11872		return (EINVAL);
11873	}
11874	sctp_alloc_a_chunk(stcb, chk);
11875	if (chk == NULL) {
11876		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11877		return (ENOMEM);
11878	}
11879	chk->copy_by_ref = 0;
11880	chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11881	chk->rec.chunk_id.can_take_data = 0;
11882	chk->asoc = &stcb->asoc;
11883	chk->book_size = sizeof(struct sctp_chunkhdr);
11884	chk->send_size = SCTP_SIZE32(chk->book_size);
11885	chk->book_size_scale = 0;
11886
11887	chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11888	if (chk->data == NULL) {
11889		sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
11890		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11891		return (ENOMEM);
11892	}
11893	SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11894
11895	/* setup chunk parameters */
11896	chk->sent = SCTP_DATAGRAM_UNSENT;
11897	chk->snd_count = 0;
11898	if (stcb->asoc.alternate) {
11899		chk->whoTo = stcb->asoc.alternate;
11900	} else {
11901		chk->whoTo = stcb->asoc.primary_destination;
11902	}
11903	atomic_add_int(&chk->whoTo->ref_count, 1);
11904	ch = mtod(chk->data, struct sctp_chunkhdr *);
11905	ch->chunk_type = SCTP_STREAM_RESET;
11906	ch->chunk_flags = 0;
11907	ch->chunk_length = htons(chk->book_size);
11908	SCTP_BUF_LEN(chk->data) = chk->send_size;
11909
11910	seq = stcb->asoc.str_reset_seq_out;
11911	if (send_out_req) {
11912		sctp_add_stream_reset_out(chk, number_entries, list,
11913		    seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1));
11914		asoc->stream_reset_out_is_outstanding = 1;
11915		seq++;
11916		asoc->stream_reset_outstanding++;
11917	}
11918	if ((add_stream & 1) &&
11919	    ((stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt) < adding_o)) {
11920		/* Need to allocate more */
11921		struct sctp_stream_out *oldstream;
11922		struct sctp_stream_queue_pending *sp, *nsp;
11923		int i;
11924
11925		oldstream = stcb->asoc.strmout;
11926		/* get some more */
11927		SCTP_MALLOC(stcb->asoc.strmout, struct sctp_stream_out *,
11928		    ((stcb->asoc.streamoutcnt + adding_o) * sizeof(struct sctp_stream_out)),
11929		    SCTP_M_STRMO);
11930		if (stcb->asoc.strmout == NULL) {
11931			uint8_t x;
11932
11933			stcb->asoc.strmout = oldstream;
11934			/* Turn off the bit */
11935			x = add_stream & 0xfe;
11936			add_stream = x;
11937			goto skip_stuff;
11938		}
11939		/*
11940		 * Ok now we proceed with copying the old out stuff and
11941		 * initializing the new stuff.
11942		 */
11943		SCTP_TCB_SEND_LOCK(stcb);
11944		stcb->asoc.ss_functions.sctp_ss_clear(stcb, &stcb->asoc, 0, 1);
11945		for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11946			TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
11947			stcb->asoc.strmout[i].chunks_on_queues = oldstream[i].chunks_on_queues;
11948			stcb->asoc.strmout[i].next_sequence_send = oldstream[i].next_sequence_send;
11949			stcb->asoc.strmout[i].last_msg_incomplete = oldstream[i].last_msg_incomplete;
11950			stcb->asoc.strmout[i].stream_no = i;
11951			stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], &oldstream[i]);
11952			/* now anything on those queues? */
11953			TAILQ_FOREACH_SAFE(sp, &oldstream[i].outqueue, next, nsp) {
11954				TAILQ_REMOVE(&oldstream[i].outqueue, sp, next);
11955				TAILQ_INSERT_TAIL(&stcb->asoc.strmout[i].outqueue, sp, next);
11956			}
11957			/* Now move assoc pointers too */
11958			if (stcb->asoc.last_out_stream == &oldstream[i]) {
11959				stcb->asoc.last_out_stream = &stcb->asoc.strmout[i];
11960			}
11961			if (stcb->asoc.locked_on_sending == &oldstream[i]) {
11962				stcb->asoc.locked_on_sending = &stcb->asoc.strmout[i];
11963			}
11964		}
11965		/* now the new streams */
11966		stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 1);
11967		for (i = stcb->asoc.streamoutcnt; i < (stcb->asoc.streamoutcnt + adding_o); i++) {
11968			TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
11969			stcb->asoc.strmout[i].chunks_on_queues = 0;
11970			stcb->asoc.strmout[i].next_sequence_send = 0x0;
11971			stcb->asoc.strmout[i].stream_no = i;
11972			stcb->asoc.strmout[i].last_msg_incomplete = 0;
11973			stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], NULL);
11974		}
11975		stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt + adding_o;
11976		SCTP_FREE(oldstream, SCTP_M_STRMO);
11977		SCTP_TCB_SEND_UNLOCK(stcb);
11978	}
11979skip_stuff:
11980	if ((add_stream & 1) && (adding_o > 0)) {
11981		asoc->strm_pending_add_size = adding_o;
11982		asoc->peer_req_out = peer_asked;
11983		sctp_add_an_out_stream(chk, seq, adding_o);
11984		seq++;
11985		asoc->stream_reset_outstanding++;
11986	}
11987	if ((add_stream & 2) && (adding_i > 0)) {
11988		sctp_add_an_in_stream(chk, seq, adding_i);
11989		seq++;
11990		asoc->stream_reset_outstanding++;
11991	}
11992	if (send_in_req) {
11993		sctp_add_stream_reset_in(chk, number_entries, list, seq);
11994		seq++;
11995		asoc->stream_reset_outstanding++;
11996	}
11997	if (send_tsn_req) {
11998		sctp_add_stream_reset_tsn(chk, seq);
11999		asoc->stream_reset_outstanding++;
12000	}
12001	asoc->str_reset = chk;
12002	/* insert the chunk for sending */
12003	TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12004	    chk,
12005	    sctp_next);
12006	asoc->ctrl_queue_cnt++;
12007	sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12008	return (0);
12009}
12010
12011void
12012sctp_send_abort(struct mbuf *m, int iphlen, struct sockaddr *src, struct sockaddr *dst,
12013    struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12014    uint8_t use_mflowid, uint32_t mflowid,
12015    uint32_t vrf_id, uint16_t port)
12016{
12017	/* Don't respond to an ABORT with an ABORT. */
12018	if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
12019		if (cause)
12020			sctp_m_freem(cause);
12021		return;
12022	}
12023	sctp_send_resp_msg(src, dst, sh, vtag, SCTP_ABORT_ASSOCIATION, cause,
12024	    use_mflowid, mflowid,
12025	    vrf_id, port);
12026	return;
12027}
12028
12029void
12030sctp_send_operr_to(struct sockaddr *src, struct sockaddr *dst,
12031    struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12032    uint8_t use_mflowid, uint32_t mflowid,
12033    uint32_t vrf_id, uint16_t port)
12034{
12035	sctp_send_resp_msg(src, dst, sh, vtag, SCTP_OPERATION_ERROR, cause,
12036	    use_mflowid, mflowid,
12037	    vrf_id, port);
12038	return;
12039}
12040
12041static struct mbuf *
12042sctp_copy_resume(struct uio *uio,
12043    int max_send_len,
12044    int user_marks_eor,
12045    int *error,
12046    uint32_t * sndout,
12047    struct mbuf **new_tail)
12048{
12049	struct mbuf *m;
12050
12051	m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
12052	    (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
12053	if (m == NULL) {
12054		SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12055		*error = ENOBUFS;
12056	} else {
12057		*sndout = m_length(m, NULL);
12058		*new_tail = m_last(m);
12059	}
12060	return (m);
12061}
12062
12063static int
12064sctp_copy_one(struct sctp_stream_queue_pending *sp,
12065    struct uio *uio,
12066    int resv_upfront)
12067{
12068	int left;
12069
12070	left = sp->length;
12071	sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
12072	    resv_upfront, 0);
12073	if (sp->data == NULL) {
12074		SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12075		return (ENOBUFS);
12076	}
12077	sp->tail_mbuf = m_last(sp->data);
12078	return (0);
12079}
12080
12081
12082
12083static struct sctp_stream_queue_pending *
12084sctp_copy_it_in(struct sctp_tcb *stcb,
12085    struct sctp_association *asoc,
12086    struct sctp_sndrcvinfo *srcv,
12087    struct uio *uio,
12088    struct sctp_nets *net,
12089    int max_send_len,
12090    int user_marks_eor,
12091    int *error)
12092{
12093	/*-
12094	 * This routine must be very careful in its work. Protocol
12095	 * processing is up and running so care must be taken to spl...()
12096	 * when you need to do something that may effect the stcb/asoc. The
12097	 * sb is locked however. When data is copied the protocol processing
12098	 * should be enabled since this is a slower operation...
12099	 */
12100	struct sctp_stream_queue_pending *sp = NULL;
12101	int resv_in_first;
12102
12103	*error = 0;
12104	/* Now can we send this? */
12105	if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12106	    (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12107	    (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12108	    (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12109		/* got data while shutting down */
12110		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12111		*error = ECONNRESET;
12112		goto out_now;
12113	}
12114	sctp_alloc_a_strmoq(stcb, sp);
12115	if (sp == NULL) {
12116		SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12117		*error = ENOMEM;
12118		goto out_now;
12119	}
12120	sp->act_flags = 0;
12121	sp->sender_all_done = 0;
12122	sp->sinfo_flags = srcv->sinfo_flags;
12123	sp->timetolive = srcv->sinfo_timetolive;
12124	sp->ppid = srcv->sinfo_ppid;
12125	sp->context = srcv->sinfo_context;
12126	(void)SCTP_GETTIME_TIMEVAL(&sp->ts);
12127
12128	sp->stream = srcv->sinfo_stream;
12129	sp->length = min(uio->uio_resid, max_send_len);
12130	if ((sp->length == (uint32_t) uio->uio_resid) &&
12131	    ((user_marks_eor == 0) ||
12132	    (srcv->sinfo_flags & SCTP_EOF) ||
12133	    (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12134		sp->msg_is_complete = 1;
12135	} else {
12136		sp->msg_is_complete = 0;
12137	}
12138	sp->sender_all_done = 0;
12139	sp->some_taken = 0;
12140	sp->put_last_out = 0;
12141	resv_in_first = sizeof(struct sctp_data_chunk);
12142	sp->data = sp->tail_mbuf = NULL;
12143	if (sp->length == 0) {
12144		*error = 0;
12145		goto skip_copy;
12146	}
12147	if (srcv->sinfo_keynumber_valid) {
12148		sp->auth_keyid = srcv->sinfo_keynumber;
12149	} else {
12150		sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
12151	}
12152	if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
12153		sctp_auth_key_acquire(stcb, sp->auth_keyid);
12154		sp->holds_key_ref = 1;
12155	}
12156	*error = sctp_copy_one(sp, uio, resv_in_first);
12157skip_copy:
12158	if (*error) {
12159		sctp_free_a_strmoq(stcb, sp, SCTP_SO_LOCKED);
12160		sp = NULL;
12161	} else {
12162		if (sp->sinfo_flags & SCTP_ADDR_OVER) {
12163			sp->net = net;
12164			atomic_add_int(&sp->net->ref_count, 1);
12165		} else {
12166			sp->net = NULL;
12167		}
12168		sctp_set_prsctp_policy(sp);
12169	}
12170out_now:
12171	return (sp);
12172}
12173
12174
12175int
12176sctp_sosend(struct socket *so,
12177    struct sockaddr *addr,
12178    struct uio *uio,
12179    struct mbuf *top,
12180    struct mbuf *control,
12181    int flags,
12182    struct thread *p
12183)
12184{
12185	int error, use_sndinfo = 0;
12186	struct sctp_sndrcvinfo sndrcvninfo;
12187	struct sockaddr *addr_to_use;
12188
12189#if defined(INET) && defined(INET6)
12190	struct sockaddr_in sin;
12191
12192#endif
12193
12194	if (control) {
12195		/* process cmsg snd/rcv info (maybe a assoc-id) */
12196		if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&sndrcvninfo, control,
12197		    sizeof(sndrcvninfo))) {
12198			/* got one */
12199			use_sndinfo = 1;
12200		}
12201	}
12202	addr_to_use = addr;
12203#if defined(INET) && defined(INET6)
12204	if ((addr) && (addr->sa_family == AF_INET6)) {
12205		struct sockaddr_in6 *sin6;
12206
12207		sin6 = (struct sockaddr_in6 *)addr;
12208		if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
12209			in6_sin6_2_sin(&sin, sin6);
12210			addr_to_use = (struct sockaddr *)&sin;
12211		}
12212	}
12213#endif
12214	error = sctp_lower_sosend(so, addr_to_use, uio, top,
12215	    control,
12216	    flags,
12217	    use_sndinfo ? &sndrcvninfo : NULL
12218	    ,p
12219	    );
12220	return (error);
12221}
12222
12223
12224int
12225sctp_lower_sosend(struct socket *so,
12226    struct sockaddr *addr,
12227    struct uio *uio,
12228    struct mbuf *i_pak,
12229    struct mbuf *control,
12230    int flags,
12231    struct sctp_sndrcvinfo *srcv
12232    ,
12233    struct thread *p
12234)
12235{
12236	unsigned int sndlen = 0, max_len;
12237	int error, len;
12238	struct mbuf *top = NULL;
12239	int queue_only = 0, queue_only_for_init = 0;
12240	int free_cnt_applied = 0;
12241	int un_sent;
12242	int now_filled = 0;
12243	unsigned int inqueue_bytes = 0;
12244	struct sctp_block_entry be;
12245	struct sctp_inpcb *inp;
12246	struct sctp_tcb *stcb = NULL;
12247	struct timeval now;
12248	struct sctp_nets *net;
12249	struct sctp_association *asoc;
12250	struct sctp_inpcb *t_inp;
12251	int user_marks_eor;
12252	int create_lock_applied = 0;
12253	int nagle_applies = 0;
12254	int some_on_control = 0;
12255	int got_all_of_the_send = 0;
12256	int hold_tcblock = 0;
12257	int non_blocking = 0;
12258	uint32_t local_add_more, local_soresv = 0;
12259	uint16_t port;
12260	uint16_t sinfo_flags;
12261	sctp_assoc_t sinfo_assoc_id;
12262
12263	error = 0;
12264	net = NULL;
12265	stcb = NULL;
12266	asoc = NULL;
12267
12268	t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
12269	if (inp == NULL) {
12270		SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12271		error = EINVAL;
12272		if (i_pak) {
12273			SCTP_RELEASE_PKT(i_pak);
12274		}
12275		return (error);
12276	}
12277	if ((uio == NULL) && (i_pak == NULL)) {
12278		SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12279		return (EINVAL);
12280	}
12281	user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
12282	atomic_add_int(&inp->total_sends, 1);
12283	if (uio) {
12284		if (uio->uio_resid < 0) {
12285			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12286			return (EINVAL);
12287		}
12288		sndlen = uio->uio_resid;
12289	} else {
12290		top = SCTP_HEADER_TO_CHAIN(i_pak);
12291		sndlen = SCTP_HEADER_LEN(i_pak);
12292	}
12293	SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %d\n",
12294	    (void *)addr,
12295	    sndlen);
12296	if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
12297	    (inp->sctp_socket->so_qlimit)) {
12298		/* The listener can NOT send */
12299		SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12300		error = ENOTCONN;
12301		goto out_unlocked;
12302	}
12303	/**
12304	 * Pre-screen address, if one is given the sin-len
12305	 * must be set correctly!
12306	 */
12307	if (addr) {
12308		union sctp_sockstore *raddr = (union sctp_sockstore *)addr;
12309
12310		switch (raddr->sa.sa_family) {
12311#ifdef INET
12312		case AF_INET:
12313			if (raddr->sin.sin_len != sizeof(struct sockaddr_in)) {
12314				SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12315				error = EINVAL;
12316				goto out_unlocked;
12317			}
12318			port = raddr->sin.sin_port;
12319			break;
12320#endif
12321#ifdef INET6
12322		case AF_INET6:
12323			if (raddr->sin6.sin6_len != sizeof(struct sockaddr_in6)) {
12324				SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12325				error = EINVAL;
12326				goto out_unlocked;
12327			}
12328			port = raddr->sin6.sin6_port;
12329			break;
12330#endif
12331		default:
12332			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAFNOSUPPORT);
12333			error = EAFNOSUPPORT;
12334			goto out_unlocked;
12335		}
12336	} else
12337		port = 0;
12338
12339	if (srcv) {
12340		sinfo_flags = srcv->sinfo_flags;
12341		sinfo_assoc_id = srcv->sinfo_assoc_id;
12342		if (INVALID_SINFO_FLAG(sinfo_flags) ||
12343		    PR_SCTP_INVALID_POLICY(sinfo_flags)) {
12344			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12345			error = EINVAL;
12346			goto out_unlocked;
12347		}
12348		if (srcv->sinfo_flags)
12349			SCTP_STAT_INCR(sctps_sends_with_flags);
12350	} else {
12351		sinfo_flags = inp->def_send.sinfo_flags;
12352		sinfo_assoc_id = inp->def_send.sinfo_assoc_id;
12353	}
12354	if (sinfo_flags & SCTP_SENDALL) {
12355		/* its a sendall */
12356		error = sctp_sendall(inp, uio, top, srcv);
12357		top = NULL;
12358		goto out_unlocked;
12359	}
12360	if ((sinfo_flags & SCTP_ADDR_OVER) && (addr == NULL)) {
12361		SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12362		error = EINVAL;
12363		goto out_unlocked;
12364	}
12365	/* now we must find the assoc */
12366	if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12367	    (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12368		SCTP_INP_RLOCK(inp);
12369		stcb = LIST_FIRST(&inp->sctp_asoc_list);
12370		if (stcb) {
12371			SCTP_TCB_LOCK(stcb);
12372			hold_tcblock = 1;
12373		}
12374		SCTP_INP_RUNLOCK(inp);
12375	} else if (sinfo_assoc_id) {
12376		stcb = sctp_findassociation_ep_asocid(inp, sinfo_assoc_id, 0);
12377	} else if (addr) {
12378		/*-
12379		 * Since we did not use findep we must
12380		 * increment it, and if we don't find a tcb
12381		 * decrement it.
12382		 */
12383		SCTP_INP_WLOCK(inp);
12384		SCTP_INP_INCR_REF(inp);
12385		SCTP_INP_WUNLOCK(inp);
12386		stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12387		if (stcb == NULL) {
12388			SCTP_INP_WLOCK(inp);
12389			SCTP_INP_DECR_REF(inp);
12390			SCTP_INP_WUNLOCK(inp);
12391		} else {
12392			hold_tcblock = 1;
12393		}
12394	}
12395	if ((stcb == NULL) && (addr)) {
12396		/* Possible implicit send? */
12397		SCTP_ASOC_CREATE_LOCK(inp);
12398		create_lock_applied = 1;
12399		if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12400		    (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12401			/* Should I really unlock ? */
12402			SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12403			error = EINVAL;
12404			goto out_unlocked;
12405
12406		}
12407		if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12408		    (addr->sa_family == AF_INET6)) {
12409			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12410			error = EINVAL;
12411			goto out_unlocked;
12412		}
12413		SCTP_INP_WLOCK(inp);
12414		SCTP_INP_INCR_REF(inp);
12415		SCTP_INP_WUNLOCK(inp);
12416		/* With the lock applied look again */
12417		stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12418		if ((stcb == NULL) && (control != NULL) && (port > 0)) {
12419			stcb = sctp_findassociation_cmsgs(&t_inp, port, control, &net, &error);
12420		}
12421		if (stcb == NULL) {
12422			SCTP_INP_WLOCK(inp);
12423			SCTP_INP_DECR_REF(inp);
12424			SCTP_INP_WUNLOCK(inp);
12425		} else {
12426			hold_tcblock = 1;
12427		}
12428		if (error) {
12429			goto out_unlocked;
12430		}
12431		if (t_inp != inp) {
12432			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12433			error = ENOTCONN;
12434			goto out_unlocked;
12435		}
12436	}
12437	if (stcb == NULL) {
12438		if (addr == NULL) {
12439			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12440			error = ENOENT;
12441			goto out_unlocked;
12442		} else {
12443			/* We must go ahead and start the INIT process */
12444			uint32_t vrf_id;
12445
12446			if ((sinfo_flags & SCTP_ABORT) ||
12447			    ((sinfo_flags & SCTP_EOF) && (sndlen == 0))) {
12448				/*-
12449				 * User asks to abort a non-existant assoc,
12450				 * or EOF a non-existant assoc with no data
12451				 */
12452				SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12453				error = ENOENT;
12454				goto out_unlocked;
12455			}
12456			/* get an asoc/stcb struct */
12457			vrf_id = inp->def_vrf_id;
12458#ifdef INVARIANTS
12459			if (create_lock_applied == 0) {
12460				panic("Error, should hold create lock and I don't?");
12461			}
12462#endif
12463			stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
12464			    p
12465			    );
12466			if (stcb == NULL) {
12467				/* Error is setup for us in the call */
12468				goto out_unlocked;
12469			}
12470			if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
12471				stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
12472				/*
12473				 * Set the connected flag so we can queue
12474				 * data
12475				 */
12476				soisconnecting(so);
12477			}
12478			hold_tcblock = 1;
12479			if (create_lock_applied) {
12480				SCTP_ASOC_CREATE_UNLOCK(inp);
12481				create_lock_applied = 0;
12482			} else {
12483				SCTP_PRINTF("Huh-3? create lock should have been on??\n");
12484			}
12485			/*
12486			 * Turn on queue only flag to prevent data from
12487			 * being sent
12488			 */
12489			queue_only = 1;
12490			asoc = &stcb->asoc;
12491			SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12492			(void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
12493
12494			/* initialize authentication params for the assoc */
12495			sctp_initialize_auth_params(inp, stcb);
12496
12497			if (control) {
12498				if (sctp_process_cmsgs_for_init(stcb, control, &error)) {
12499					sctp_free_assoc(inp, stcb, SCTP_PCBFREE_FORCE, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_7);
12500					hold_tcblock = 0;
12501					stcb = NULL;
12502					goto out_unlocked;
12503				}
12504			}
12505			/* out with the INIT */
12506			queue_only_for_init = 1;
12507			/*-
12508			 * we may want to dig in after this call and adjust the MTU
12509			 * value. It defaulted to 1500 (constant) but the ro
12510			 * structure may now have an update and thus we may need to
12511			 * change it BEFORE we append the message.
12512			 */
12513		}
12514	} else
12515		asoc = &stcb->asoc;
12516	if (srcv == NULL)
12517		srcv = (struct sctp_sndrcvinfo *)&asoc->def_send;
12518	if (srcv->sinfo_flags & SCTP_ADDR_OVER) {
12519		if (addr)
12520			net = sctp_findnet(stcb, addr);
12521		else
12522			net = NULL;
12523		if ((net == NULL) ||
12524		    ((port != 0) && (port != stcb->rport))) {
12525			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12526			error = EINVAL;
12527			goto out_unlocked;
12528		}
12529	} else {
12530		if (stcb->asoc.alternate) {
12531			net = stcb->asoc.alternate;
12532		} else {
12533			net = stcb->asoc.primary_destination;
12534		}
12535	}
12536	atomic_add_int(&stcb->total_sends, 1);
12537	/* Keep the stcb from being freed under our feet */
12538	atomic_add_int(&asoc->refcnt, 1);
12539	free_cnt_applied = 1;
12540
12541	if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12542		if (sndlen > asoc->smallest_mtu) {
12543			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12544			error = EMSGSIZE;
12545			goto out_unlocked;
12546		}
12547	}
12548	if (SCTP_SO_IS_NBIO(so)
12549	    || (flags & MSG_NBIO)
12550	    ) {
12551		non_blocking = 1;
12552	}
12553	/* would we block? */
12554	if (non_blocking) {
12555		if (hold_tcblock == 0) {
12556			SCTP_TCB_LOCK(stcb);
12557			hold_tcblock = 1;
12558		}
12559		inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12560		if ((SCTP_SB_LIMIT_SND(so) < (sndlen + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
12561		    (stcb->asoc.chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12562			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
12563			if (sndlen > SCTP_SB_LIMIT_SND(so))
12564				error = EMSGSIZE;
12565			else
12566				error = EWOULDBLOCK;
12567			goto out_unlocked;
12568		}
12569		stcb->asoc.sb_send_resv += sndlen;
12570		SCTP_TCB_UNLOCK(stcb);
12571		hold_tcblock = 0;
12572	} else {
12573		atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
12574	}
12575	local_soresv = sndlen;
12576	if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12577		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12578		error = ECONNRESET;
12579		goto out_unlocked;
12580	}
12581	if (create_lock_applied) {
12582		SCTP_ASOC_CREATE_UNLOCK(inp);
12583		create_lock_applied = 0;
12584	}
12585	if (asoc->stream_reset_outstanding) {
12586		/*
12587		 * Can't queue any data while stream reset is underway.
12588		 */
12589		SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAGAIN);
12590		error = EAGAIN;
12591		goto out_unlocked;
12592	}
12593	if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12594	    (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12595		queue_only = 1;
12596	}
12597	/* we are now done with all control */
12598	if (control) {
12599		sctp_m_freem(control);
12600		control = NULL;
12601	}
12602	if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12603	    (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12604	    (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12605	    (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12606		if (srcv->sinfo_flags & SCTP_ABORT) {
12607			;
12608		} else {
12609			SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12610			error = ECONNRESET;
12611			goto out_unlocked;
12612		}
12613	}
12614	/* Ok, we will attempt a msgsnd :> */
12615	if (p) {
12616		p->td_ru.ru_msgsnd++;
12617	}
12618	/* Are we aborting? */
12619	if (srcv->sinfo_flags & SCTP_ABORT) {
12620		struct mbuf *mm;
12621		int tot_demand, tot_out = 0, max_out;
12622
12623		SCTP_STAT_INCR(sctps_sends_with_abort);
12624		if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12625		    (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12626			/* It has to be up before we abort */
12627			/* how big is the user initiated abort? */
12628			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12629			error = EINVAL;
12630			goto out;
12631		}
12632		if (hold_tcblock) {
12633			SCTP_TCB_UNLOCK(stcb);
12634			hold_tcblock = 0;
12635		}
12636		if (top) {
12637			struct mbuf *cntm = NULL;
12638
12639			mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_WAITOK, 1, MT_DATA);
12640			if (sndlen != 0) {
12641				for (cntm = top; cntm; cntm = SCTP_BUF_NEXT(cntm)) {
12642					tot_out += SCTP_BUF_LEN(cntm);
12643				}
12644			}
12645		} else {
12646			/* Must fit in a MTU */
12647			tot_out = sndlen;
12648			tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12649			if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
12650				/* To big */
12651				SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12652				error = EMSGSIZE;
12653				goto out;
12654			}
12655			mm = sctp_get_mbuf_for_msg(tot_demand, 0, M_WAITOK, 1, MT_DATA);
12656		}
12657		if (mm == NULL) {
12658			SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12659			error = ENOMEM;
12660			goto out;
12661		}
12662		max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
12663		max_out -= sizeof(struct sctp_abort_msg);
12664		if (tot_out > max_out) {
12665			tot_out = max_out;
12666		}
12667		if (mm) {
12668			struct sctp_paramhdr *ph;
12669
12670			/* now move forward the data pointer */
12671			ph = mtod(mm, struct sctp_paramhdr *);
12672			ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
12673			ph->param_length = htons(sizeof(struct sctp_paramhdr) + tot_out);
12674			ph++;
12675			SCTP_BUF_LEN(mm) = tot_out + sizeof(struct sctp_paramhdr);
12676			if (top == NULL) {
12677				error = uiomove((caddr_t)ph, (int)tot_out, uio);
12678				if (error) {
12679					/*-
12680					 * Here if we can't get his data we
12681					 * still abort we just don't get to
12682					 * send the users note :-0
12683					 */
12684					sctp_m_freem(mm);
12685					mm = NULL;
12686				}
12687			} else {
12688				if (sndlen != 0) {
12689					SCTP_BUF_NEXT(mm) = top;
12690				}
12691			}
12692		}
12693		if (hold_tcblock == 0) {
12694			SCTP_TCB_LOCK(stcb);
12695		}
12696		atomic_add_int(&stcb->asoc.refcnt, -1);
12697		free_cnt_applied = 0;
12698		/* release this lock, otherwise we hang on ourselves */
12699		sctp_abort_an_association(stcb->sctp_ep, stcb, mm, SCTP_SO_LOCKED);
12700		/* now relock the stcb so everything is sane */
12701		hold_tcblock = 0;
12702		stcb = NULL;
12703		/*
12704		 * In this case top is already chained to mm avoid double
12705		 * free, since we free it below if top != NULL and driver
12706		 * would free it after sending the packet out
12707		 */
12708		if (sndlen != 0) {
12709			top = NULL;
12710		}
12711		goto out_unlocked;
12712	}
12713	/* Calculate the maximum we can send */
12714	inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12715	if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
12716		if (non_blocking) {
12717			/* we already checked for non-blocking above. */
12718			max_len = sndlen;
12719		} else {
12720			max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12721		}
12722	} else {
12723		max_len = 0;
12724	}
12725	if (hold_tcblock) {
12726		SCTP_TCB_UNLOCK(stcb);
12727		hold_tcblock = 0;
12728	}
12729	/* Is the stream no. valid? */
12730	if (srcv->sinfo_stream >= asoc->streamoutcnt) {
12731		/* Invalid stream number */
12732		SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12733		error = EINVAL;
12734		goto out_unlocked;
12735	}
12736	if (asoc->strmout == NULL) {
12737		/* huh? software error */
12738		SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
12739		error = EFAULT;
12740		goto out_unlocked;
12741	}
12742	/* Unless E_EOR mode is on, we must make a send FIT in one call. */
12743	if ((user_marks_eor == 0) &&
12744	    (sndlen > SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
12745		/* It will NEVER fit */
12746		SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12747		error = EMSGSIZE;
12748		goto out_unlocked;
12749	}
12750	if ((uio == NULL) && user_marks_eor) {
12751		/*-
12752		 * We do not support eeor mode for
12753		 * sending with mbuf chains (like sendfile).
12754		 */
12755		SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12756		error = EINVAL;
12757		goto out_unlocked;
12758	}
12759	if (user_marks_eor) {
12760		local_add_more = min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
12761	} else {
12762		/*-
12763		 * For non-eeor the whole message must fit in
12764		 * the socket send buffer.
12765		 */
12766		local_add_more = sndlen;
12767	}
12768	len = 0;
12769	if (non_blocking) {
12770		goto skip_preblock;
12771	}
12772	if (((max_len <= local_add_more) &&
12773	    (SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
12774	    (max_len == 0) ||
12775	    ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12776		/* No room right now ! */
12777		SOCKBUF_LOCK(&so->so_snd);
12778		inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12779		while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
12780		    ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12781			SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %d) || (%d+%d > %d)\n",
12782			    (unsigned int)SCTP_SB_LIMIT_SND(so),
12783			    inqueue_bytes,
12784			    local_add_more,
12785			    stcb->asoc.stream_queue_cnt,
12786			    stcb->asoc.chunks_on_out_queue,
12787			    SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
12788			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12789				sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, asoc, sndlen);
12790			}
12791			be.error = 0;
12792			stcb->block_entry = &be;
12793			error = sbwait(&so->so_snd);
12794			stcb->block_entry = NULL;
12795			if (error || so->so_error || be.error) {
12796				if (error == 0) {
12797					if (so->so_error)
12798						error = so->so_error;
12799					if (be.error) {
12800						error = be.error;
12801					}
12802				}
12803				SOCKBUF_UNLOCK(&so->so_snd);
12804				goto out_unlocked;
12805			}
12806			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12807				sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
12808				    asoc, stcb->asoc.total_output_queue_size);
12809			}
12810			if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12811				goto out_unlocked;
12812			}
12813			inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12814		}
12815		if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
12816			max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12817		} else {
12818			max_len = 0;
12819		}
12820		SOCKBUF_UNLOCK(&so->so_snd);
12821	}
12822skip_preblock:
12823	if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12824		goto out_unlocked;
12825	}
12826	/*
12827	 * sndlen covers for mbuf case uio_resid covers for the non-mbuf
12828	 * case NOTE: uio will be null when top/mbuf is passed
12829	 */
12830	if (sndlen == 0) {
12831		if (srcv->sinfo_flags & SCTP_EOF) {
12832			got_all_of_the_send = 1;
12833			goto dataless_eof;
12834		} else {
12835			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12836			error = EINVAL;
12837			goto out;
12838		}
12839	}
12840	if (top == NULL) {
12841		struct sctp_stream_queue_pending *sp;
12842		struct sctp_stream_out *strm;
12843		uint32_t sndout;
12844
12845		SCTP_TCB_SEND_LOCK(stcb);
12846		if ((asoc->stream_locked) &&
12847		    (asoc->stream_locked_on != srcv->sinfo_stream)) {
12848			SCTP_TCB_SEND_UNLOCK(stcb);
12849			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12850			error = EINVAL;
12851			goto out;
12852		}
12853		SCTP_TCB_SEND_UNLOCK(stcb);
12854
12855		strm = &stcb->asoc.strmout[srcv->sinfo_stream];
12856		if (strm->last_msg_incomplete == 0) {
12857	do_a_copy_in:
12858			sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error);
12859			if ((sp == NULL) || (error)) {
12860				goto out;
12861			}
12862			SCTP_TCB_SEND_LOCK(stcb);
12863			if (sp->msg_is_complete) {
12864				strm->last_msg_incomplete = 0;
12865				asoc->stream_locked = 0;
12866			} else {
12867				/*
12868				 * Just got locked to this guy in case of an
12869				 * interrupt.
12870				 */
12871				strm->last_msg_incomplete = 1;
12872				asoc->stream_locked = 1;
12873				asoc->stream_locked_on = srcv->sinfo_stream;
12874				sp->sender_all_done = 0;
12875			}
12876			sctp_snd_sb_alloc(stcb, sp->length);
12877			atomic_add_int(&asoc->stream_queue_cnt, 1);
12878			if (srcv->sinfo_flags & SCTP_UNORDERED) {
12879				SCTP_STAT_INCR(sctps_sends_with_unord);
12880			}
12881			TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
12882			stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, asoc, strm, sp, 1);
12883			SCTP_TCB_SEND_UNLOCK(stcb);
12884		} else {
12885			SCTP_TCB_SEND_LOCK(stcb);
12886			sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
12887			SCTP_TCB_SEND_UNLOCK(stcb);
12888			if (sp == NULL) {
12889				/* ???? Huh ??? last msg is gone */
12890#ifdef INVARIANTS
12891				panic("Warning: Last msg marked incomplete, yet nothing left?");
12892#else
12893				SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
12894				strm->last_msg_incomplete = 0;
12895#endif
12896				goto do_a_copy_in;
12897
12898			}
12899		}
12900		while (uio->uio_resid > 0) {
12901			/* How much room do we have? */
12902			struct mbuf *new_tail, *mm;
12903
12904			if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
12905				max_len = SCTP_SB_LIMIT_SND(so) - stcb->asoc.total_output_queue_size;
12906			else
12907				max_len = 0;
12908
12909			if ((max_len > SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
12910			    (max_len && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
12911			    (uio->uio_resid && (uio->uio_resid <= (int)max_len))) {
12912				sndout = 0;
12913				new_tail = NULL;
12914				if (hold_tcblock) {
12915					SCTP_TCB_UNLOCK(stcb);
12916					hold_tcblock = 0;
12917				}
12918				mm = sctp_copy_resume(uio, max_len, user_marks_eor, &error, &sndout, &new_tail);
12919				if ((mm == NULL) || error) {
12920					if (mm) {
12921						sctp_m_freem(mm);
12922					}
12923					goto out;
12924				}
12925				/* Update the mbuf and count */
12926				SCTP_TCB_SEND_LOCK(stcb);
12927				if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12928					/*
12929					 * we need to get out. Peer probably
12930					 * aborted.
12931					 */
12932					sctp_m_freem(mm);
12933					if (stcb->asoc.state & SCTP_PCB_FLAGS_WAS_ABORTED) {
12934						SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12935						error = ECONNRESET;
12936					}
12937					SCTP_TCB_SEND_UNLOCK(stcb);
12938					goto out;
12939				}
12940				if (sp->tail_mbuf) {
12941					/* tack it to the end */
12942					SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
12943					sp->tail_mbuf = new_tail;
12944				} else {
12945					/* A stolen mbuf */
12946					sp->data = mm;
12947					sp->tail_mbuf = new_tail;
12948				}
12949				sctp_snd_sb_alloc(stcb, sndout);
12950				atomic_add_int(&sp->length, sndout);
12951				len += sndout;
12952
12953				/* Did we reach EOR? */
12954				if ((uio->uio_resid == 0) &&
12955				    ((user_marks_eor == 0) ||
12956				    (srcv->sinfo_flags & SCTP_EOF) ||
12957				    (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12958					sp->msg_is_complete = 1;
12959				} else {
12960					sp->msg_is_complete = 0;
12961				}
12962				SCTP_TCB_SEND_UNLOCK(stcb);
12963			}
12964			if (uio->uio_resid == 0) {
12965				/* got it all? */
12966				continue;
12967			}
12968			/* PR-SCTP? */
12969			if ((asoc->prsctp_supported) && (asoc->sent_queue_cnt_removeable > 0)) {
12970				/*
12971				 * This is ugly but we must assure locking
12972				 * order
12973				 */
12974				if (hold_tcblock == 0) {
12975					SCTP_TCB_LOCK(stcb);
12976					hold_tcblock = 1;
12977				}
12978				sctp_prune_prsctp(stcb, asoc, srcv, sndlen);
12979				inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12980				if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
12981					max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12982				else
12983					max_len = 0;
12984				if (max_len > 0) {
12985					continue;
12986				}
12987				SCTP_TCB_UNLOCK(stcb);
12988				hold_tcblock = 0;
12989			}
12990			/* wait for space now */
12991			if (non_blocking) {
12992				/* Non-blocking io in place out */
12993				goto skip_out_eof;
12994			}
12995			/* What about the INIT, send it maybe */
12996			if (queue_only_for_init) {
12997				if (hold_tcblock == 0) {
12998					SCTP_TCB_LOCK(stcb);
12999					hold_tcblock = 1;
13000				}
13001				if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13002					/* a collision took us forward? */
13003					queue_only = 0;
13004				} else {
13005					sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13006					SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
13007					queue_only = 1;
13008				}
13009			}
13010			if ((net->flight_size > net->cwnd) &&
13011			    (asoc->sctp_cmt_on_off == 0)) {
13012				SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13013				queue_only = 1;
13014			} else if (asoc->ifp_had_enobuf) {
13015				SCTP_STAT_INCR(sctps_ifnomemqueued);
13016				if (net->flight_size > (2 * net->mtu)) {
13017					queue_only = 1;
13018				}
13019				asoc->ifp_had_enobuf = 0;
13020			}
13021			un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13022			    (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13023			if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13024			    (stcb->asoc.total_flight > 0) &&
13025			    (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13026			    (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13027
13028				/*-
13029				 * Ok, Nagle is set on and we have data outstanding.
13030				 * Don't send anything and let SACKs drive out the
13031				 * data unless wen have a "full" segment to send.
13032				 */
13033				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13034					sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13035				}
13036				SCTP_STAT_INCR(sctps_naglequeued);
13037				nagle_applies = 1;
13038			} else {
13039				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13040					if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13041						sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13042				}
13043				SCTP_STAT_INCR(sctps_naglesent);
13044				nagle_applies = 0;
13045			}
13046			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13047
13048				sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13049				    nagle_applies, un_sent);
13050				sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13051				    stcb->asoc.total_flight,
13052				    stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13053			}
13054			if (queue_only_for_init)
13055				queue_only_for_init = 0;
13056			if ((queue_only == 0) && (nagle_applies == 0)) {
13057				/*-
13058				 * need to start chunk output
13059				 * before blocking.. note that if
13060				 * a lock is already applied, then
13061				 * the input via the net is happening
13062				 * and I don't need to start output :-D
13063				 */
13064				if (hold_tcblock == 0) {
13065					if (SCTP_TCB_TRYLOCK(stcb)) {
13066						hold_tcblock = 1;
13067						sctp_chunk_output(inp,
13068						    stcb,
13069						    SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13070					}
13071				} else {
13072					sctp_chunk_output(inp,
13073					    stcb,
13074					    SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13075				}
13076				if (hold_tcblock == 1) {
13077					SCTP_TCB_UNLOCK(stcb);
13078					hold_tcblock = 0;
13079				}
13080			}
13081			SOCKBUF_LOCK(&so->so_snd);
13082			/*-
13083			 * This is a bit strange, but I think it will
13084			 * work. The total_output_queue_size is locked and
13085			 * protected by the TCB_LOCK, which we just released.
13086			 * There is a race that can occur between releasing it
13087			 * above, and me getting the socket lock, where sacks
13088			 * come in but we have not put the SB_WAIT on the
13089			 * so_snd buffer to get the wakeup. After the LOCK
13090			 * is applied the sack_processing will also need to
13091			 * LOCK the so->so_snd to do the actual sowwakeup(). So
13092			 * once we have the socket buffer lock if we recheck the
13093			 * size we KNOW we will get to sleep safely with the
13094			 * wakeup flag in place.
13095			 */
13096			if (SCTP_SB_LIMIT_SND(so) <= (stcb->asoc.total_output_queue_size +
13097			    min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
13098				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13099					sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
13100					    asoc, uio->uio_resid);
13101				}
13102				be.error = 0;
13103				stcb->block_entry = &be;
13104				error = sbwait(&so->so_snd);
13105				stcb->block_entry = NULL;
13106
13107				if (error || so->so_error || be.error) {
13108					if (error == 0) {
13109						if (so->so_error)
13110							error = so->so_error;
13111						if (be.error) {
13112							error = be.error;
13113						}
13114					}
13115					SOCKBUF_UNLOCK(&so->so_snd);
13116					goto out_unlocked;
13117				}
13118				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13119					sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13120					    asoc, stcb->asoc.total_output_queue_size);
13121				}
13122			}
13123			SOCKBUF_UNLOCK(&so->so_snd);
13124			if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13125				goto out_unlocked;
13126			}
13127		}
13128		SCTP_TCB_SEND_LOCK(stcb);
13129		if (sp) {
13130			if (sp->msg_is_complete == 0) {
13131				strm->last_msg_incomplete = 1;
13132				asoc->stream_locked = 1;
13133				asoc->stream_locked_on = srcv->sinfo_stream;
13134			} else {
13135				sp->sender_all_done = 1;
13136				strm->last_msg_incomplete = 0;
13137				asoc->stream_locked = 0;
13138			}
13139		} else {
13140			SCTP_PRINTF("Huh no sp TSNH?\n");
13141			strm->last_msg_incomplete = 0;
13142			asoc->stream_locked = 0;
13143		}
13144		SCTP_TCB_SEND_UNLOCK(stcb);
13145		if (uio->uio_resid == 0) {
13146			got_all_of_the_send = 1;
13147		}
13148	} else {
13149		/* We send in a 0, since we do NOT have any locks */
13150		error = sctp_msg_append(stcb, net, top, srcv, 0);
13151		top = NULL;
13152		if (srcv->sinfo_flags & SCTP_EOF) {
13153			/*
13154			 * This should only happen for Panda for the mbuf
13155			 * send case, which does NOT yet support EEOR mode.
13156			 * Thus, we can just set this flag to do the proper
13157			 * EOF handling.
13158			 */
13159			got_all_of_the_send = 1;
13160		}
13161	}
13162	if (error) {
13163		goto out;
13164	}
13165dataless_eof:
13166	/* EOF thing ? */
13167	if ((srcv->sinfo_flags & SCTP_EOF) &&
13168	    (got_all_of_the_send == 1)) {
13169		int cnt;
13170
13171		SCTP_STAT_INCR(sctps_sends_with_eof);
13172		error = 0;
13173		if (hold_tcblock == 0) {
13174			SCTP_TCB_LOCK(stcb);
13175			hold_tcblock = 1;
13176		}
13177		cnt = sctp_is_there_unsent_data(stcb, SCTP_SO_LOCKED);
13178		if (TAILQ_EMPTY(&asoc->send_queue) &&
13179		    TAILQ_EMPTY(&asoc->sent_queue) &&
13180		    (cnt == 0)) {
13181			if (asoc->locked_on_sending) {
13182				goto abort_anyway;
13183			}
13184			/* there is nothing queued to send, so I'm done... */
13185			if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13186			    (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13187			    (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13188				struct sctp_nets *netp;
13189
13190				/* only send SHUTDOWN the first time through */
13191				if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
13192					SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13193				}
13194				SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
13195				SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
13196				sctp_stop_timers_for_shutdown(stcb);
13197				if (stcb->asoc.alternate) {
13198					netp = stcb->asoc.alternate;
13199				} else {
13200					netp = stcb->asoc.primary_destination;
13201				}
13202				sctp_send_shutdown(stcb, netp);
13203				sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13204				    netp);
13205				sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13206				    asoc->primary_destination);
13207			}
13208		} else {
13209			/*-
13210			 * we still got (or just got) data to send, so set
13211			 * SHUTDOWN_PENDING
13212			 */
13213			/*-
13214			 * XXX sockets draft says that SCTP_EOF should be
13215			 * sent with no data.  currently, we will allow user
13216			 * data to be sent first and move to
13217			 * SHUTDOWN-PENDING
13218			 */
13219			if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13220			    (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13221			    (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13222				if (hold_tcblock == 0) {
13223					SCTP_TCB_LOCK(stcb);
13224					hold_tcblock = 1;
13225				}
13226				if (asoc->locked_on_sending) {
13227					/* Locked to send out the data */
13228					struct sctp_stream_queue_pending *sp;
13229
13230					sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
13231					if (sp) {
13232						if ((sp->length == 0) && (sp->msg_is_complete == 0))
13233							asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
13234					}
13235				}
13236				asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
13237				if (TAILQ_EMPTY(&asoc->send_queue) &&
13238				    TAILQ_EMPTY(&asoc->sent_queue) &&
13239				    (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13240			abort_anyway:
13241					if (free_cnt_applied) {
13242						atomic_add_int(&stcb->asoc.refcnt, -1);
13243						free_cnt_applied = 0;
13244					}
13245					sctp_abort_an_association(stcb->sctp_ep, stcb,
13246					    NULL, SCTP_SO_LOCKED);
13247					/*
13248					 * now relock the stcb so everything
13249					 * is sane
13250					 */
13251					hold_tcblock = 0;
13252					stcb = NULL;
13253					goto out;
13254				}
13255				sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13256				    asoc->primary_destination);
13257				sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
13258			}
13259		}
13260	}
13261skip_out_eof:
13262	if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
13263		some_on_control = 1;
13264	}
13265	if (queue_only_for_init) {
13266		if (hold_tcblock == 0) {
13267			SCTP_TCB_LOCK(stcb);
13268			hold_tcblock = 1;
13269		}
13270		if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13271			/* a collision took us forward? */
13272			queue_only = 0;
13273		} else {
13274			sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13275			SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_WAIT);
13276			queue_only = 1;
13277		}
13278	}
13279	if ((net->flight_size > net->cwnd) &&
13280	    (stcb->asoc.sctp_cmt_on_off == 0)) {
13281		SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13282		queue_only = 1;
13283	} else if (asoc->ifp_had_enobuf) {
13284		SCTP_STAT_INCR(sctps_ifnomemqueued);
13285		if (net->flight_size > (2 * net->mtu)) {
13286			queue_only = 1;
13287		}
13288		asoc->ifp_had_enobuf = 0;
13289	}
13290	un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13291	    (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13292	if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13293	    (stcb->asoc.total_flight > 0) &&
13294	    (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13295	    (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13296		/*-
13297		 * Ok, Nagle is set on and we have data outstanding.
13298		 * Don't send anything and let SACKs drive out the
13299		 * data unless wen have a "full" segment to send.
13300		 */
13301		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13302			sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13303		}
13304		SCTP_STAT_INCR(sctps_naglequeued);
13305		nagle_applies = 1;
13306	} else {
13307		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13308			if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13309				sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13310		}
13311		SCTP_STAT_INCR(sctps_naglesent);
13312		nagle_applies = 0;
13313	}
13314	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13315		sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13316		    nagle_applies, un_sent);
13317		sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13318		    stcb->asoc.total_flight,
13319		    stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13320	}
13321	if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
13322		/* we can attempt to send too. */
13323		if (hold_tcblock == 0) {
13324			/*
13325			 * If there is activity recv'ing sacks no need to
13326			 * send
13327			 */
13328			if (SCTP_TCB_TRYLOCK(stcb)) {
13329				sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13330				hold_tcblock = 1;
13331			}
13332		} else {
13333			sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13334		}
13335	} else if ((queue_only == 0) &&
13336		    (stcb->asoc.peers_rwnd == 0) &&
13337	    (stcb->asoc.total_flight == 0)) {
13338		/* We get to have a probe outstanding */
13339		if (hold_tcblock == 0) {
13340			hold_tcblock = 1;
13341			SCTP_TCB_LOCK(stcb);
13342		}
13343		sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13344	} else if (some_on_control) {
13345		int num_out, reason, frag_point;
13346
13347		/* Here we do control only */
13348		if (hold_tcblock == 0) {
13349			hold_tcblock = 1;
13350			SCTP_TCB_LOCK(stcb);
13351		}
13352		frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
13353		(void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
13354		    &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
13355	}
13356	SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13357	    queue_only, stcb->asoc.peers_rwnd, un_sent,
13358	    stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
13359	    stcb->asoc.total_output_queue_size, error);
13360
13361out:
13362out_unlocked:
13363
13364	if (local_soresv && stcb) {
13365		atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
13366	}
13367	if (create_lock_applied) {
13368		SCTP_ASOC_CREATE_UNLOCK(inp);
13369	}
13370	if ((stcb) && hold_tcblock) {
13371		SCTP_TCB_UNLOCK(stcb);
13372	}
13373	if (stcb && free_cnt_applied) {
13374		atomic_add_int(&stcb->asoc.refcnt, -1);
13375	}
13376#ifdef INVARIANTS
13377	if (stcb) {
13378		if (mtx_owned(&stcb->tcb_mtx)) {
13379			panic("Leaving with tcb mtx owned?");
13380		}
13381		if (mtx_owned(&stcb->tcb_send_mtx)) {
13382			panic("Leaving with tcb send mtx owned?");
13383		}
13384	}
13385#endif
13386#ifdef INVARIANTS
13387	if (inp) {
13388		sctp_validate_no_locks(inp);
13389	} else {
13390		SCTP_PRINTF("Warning - inp is NULL so cant validate locks\n");
13391	}
13392#endif
13393	if (top) {
13394		sctp_m_freem(top);
13395	}
13396	if (control) {
13397		sctp_m_freem(control);
13398	}
13399	return (error);
13400}
13401
13402
13403/*
13404 * generate an AUTHentication chunk, if required
13405 */
13406struct mbuf *
13407sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13408    struct sctp_auth_chunk **auth_ret, uint32_t * offset,
13409    struct sctp_tcb *stcb, uint8_t chunk)
13410{
13411	struct mbuf *m_auth;
13412	struct sctp_auth_chunk *auth;
13413	int chunk_len;
13414	struct mbuf *cn;
13415
13416	if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13417	    (stcb == NULL))
13418		return (m);
13419
13420	/* sysctl disabled auth? */
13421	if (SCTP_BASE_SYSCTL(sctp_auth_disable))
13422		return (m);
13423
13424	/* peer doesn't do auth... */
13425	if (!stcb->asoc.peer_supports_auth) {
13426		return (m);
13427	}
13428	/* does the requested chunk require auth? */
13429	if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13430		return (m);
13431	}
13432	m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_NOWAIT, 1, MT_HEADER);
13433	if (m_auth == NULL) {
13434		/* no mbuf's */
13435		return (m);
13436	}
13437	/* reserve some space if this will be the first mbuf */
13438	if (m == NULL)
13439		SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13440	/* fill in the AUTH chunk details */
13441	auth = mtod(m_auth, struct sctp_auth_chunk *);
13442	bzero(auth, sizeof(*auth));
13443	auth->ch.chunk_type = SCTP_AUTHENTICATION;
13444	auth->ch.chunk_flags = 0;
13445	chunk_len = sizeof(*auth) +
13446	    sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13447	auth->ch.chunk_length = htons(chunk_len);
13448	auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13449	/* key id and hmac digest will be computed and filled in upon send */
13450
13451	/* save the offset where the auth was inserted into the chain */
13452	*offset = 0;
13453	for (cn = m; cn; cn = SCTP_BUF_NEXT(cn)) {
13454		*offset += SCTP_BUF_LEN(cn);
13455	}
13456
13457	/* update length and return pointer to the auth chunk */
13458	SCTP_BUF_LEN(m_auth) = chunk_len;
13459	m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13460	if (auth_ret != NULL)
13461		*auth_ret = auth;
13462
13463	return (m);
13464}
13465
13466#ifdef INET6
13467int
13468sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t * ro)
13469{
13470	struct nd_prefix *pfx = NULL;
13471	struct nd_pfxrouter *pfxrtr = NULL;
13472	struct sockaddr_in6 gw6;
13473
13474	if (ro == NULL || ro->ro_rt == NULL || src6->sin6_family != AF_INET6)
13475		return (0);
13476
13477	/* get prefix entry of address */
13478	LIST_FOREACH(pfx, &MODULE_GLOBAL(nd_prefix), ndpr_entry) {
13479		if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13480			continue;
13481		if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13482		    &src6->sin6_addr, &pfx->ndpr_mask))
13483			break;
13484	}
13485	/* no prefix entry in the prefix list */
13486	if (pfx == NULL) {
13487		SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13488		SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13489		return (0);
13490	}
13491	SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13492	SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13493
13494	/* search installed gateway from prefix entry */
13495	LIST_FOREACH(pfxrtr, &pfx->ndpr_advrtrs, pfr_entry) {
13496		memset(&gw6, 0, sizeof(struct sockaddr_in6));
13497		gw6.sin6_family = AF_INET6;
13498		gw6.sin6_len = sizeof(struct sockaddr_in6);
13499		memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13500		    sizeof(struct in6_addr));
13501		SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13502		SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13503		SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13504		SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13505		if (sctp_cmpaddr((struct sockaddr *)&gw6,
13506		    ro->ro_rt->rt_gateway)) {
13507			SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13508			return (1);
13509		}
13510	}
13511	SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13512	return (0);
13513}
13514
13515#endif
13516
13517int
13518sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t * ro)
13519{
13520#ifdef INET
13521	struct sockaddr_in *sin, *mask;
13522	struct ifaddr *ifa;
13523	struct in_addr srcnetaddr, gwnetaddr;
13524
13525	if (ro == NULL || ro->ro_rt == NULL ||
13526	    sifa->address.sa.sa_family != AF_INET) {
13527		return (0);
13528	}
13529	ifa = (struct ifaddr *)sifa->ifa;
13530	mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13531	sin = (struct sockaddr_in *)&sifa->address.sin;
13532	srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13533	SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13534	SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13535	SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13536
13537	sin = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
13538	gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13539	SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13540	SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13541	SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13542	if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13543		return (1);
13544	}
13545#endif
13546	return (0);
13547}
13548