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more accurate window sizes
[cor.git] / net / sctp / stream.c
blobe83cdaa2ab765c1ce20392b5ba2d91573f39ff14
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* SCTP kernel implementation
3 * (C) Copyright IBM Corp. 2001, 2004
4 * Copyright (c) 1999-2000 Cisco, Inc.
5 * Copyright (c) 1999-2001 Motorola, Inc.
6 * Copyright (c) 2001 Intel Corp.
7 *
8 * This file is part of the SCTP kernel implementation
9 *
10 * This file contains sctp stream maniuplation primitives and helpers.
11 *
12 * Please send any bug reports or fixes you make to the
13 * email address(es):
14 * lksctp developers <linux-sctp@vger.kernel.org>
15 *
16 * Written or modified by:
17 * Xin Long <lucien.xin@gmail.com>
18 */
19
20 #include <linux/list.h>
21 #include <net/sctp/sctp.h>
22 #include <net/sctp/sm.h>
23 #include <net/sctp/stream_sched.h>
24
25 /* Migrates chunks from stream queues to new stream queues if needed,
26 * but not across associations. Also, removes those chunks to streams
27 * higher than the new max.
28 */
29 static void sctp_stream_outq_migrate(struct sctp_stream *stream,
30 struct sctp_stream *new, __u16 outcnt)
31 {
32 struct sctp_association *asoc;
33 struct sctp_chunk *ch, *temp;
34 struct sctp_outq *outq;
35 int i;
36
37 asoc = container_of(stream, struct sctp_association, stream);
38 outq = &asoc->outqueue;
39
40 list_for_each_entry_safe(ch, temp, &outq->out_chunk_list, list) {
41 __u16 sid = sctp_chunk_stream_no(ch);
42
43 if (sid < outcnt)
44 continue;
45
46 sctp_sched_dequeue_common(outq, ch);
47 /* No need to call dequeue_done here because
48 * the chunks are not scheduled by now.
49 */
50
51 /* Mark as failed send. */
52 sctp_chunk_fail(ch, (__force __u32)SCTP_ERROR_INV_STRM);
53 if (asoc->peer.prsctp_capable &&
54 SCTP_PR_PRIO_ENABLED(ch->sinfo.sinfo_flags))
55 asoc->sent_cnt_removable--;
56
57 sctp_chunk_free(ch);
58 }
59
60 if (new) {
61 /* Here we actually move the old ext stuff into the new
62 * buffer, because we want to keep it. Then
63 * sctp_stream_update will swap ->out pointers.
64 */
65 for (i = 0; i < outcnt; i++) {
66 kfree(SCTP_SO(new, i)->ext);
67 SCTP_SO(new, i)->ext = SCTP_SO(stream, i)->ext;
68 SCTP_SO(stream, i)->ext = NULL;
69 }
70 }
71
72 for (i = outcnt; i < stream->outcnt; i++) {
73 kfree(SCTP_SO(stream, i)->ext);
74 SCTP_SO(stream, i)->ext = NULL;
75 }
76 }
77
78 static int sctp_stream_alloc_out(struct sctp_stream *stream, __u16 outcnt,
79 gfp_t gfp)
80 {
81 int ret;
82
83 if (outcnt <= stream->outcnt)
84 return 0;
85
86 ret = genradix_prealloc(&stream->out, outcnt, gfp);
87 if (ret)
88 return ret;
89
90 stream->outcnt = outcnt;
91 return 0;
92 }
93
94 static int sctp_stream_alloc_in(struct sctp_stream *stream, __u16 incnt,
95 gfp_t gfp)
96 {
97 int ret;
98
99 if (incnt <= stream->incnt)
100 return 0;
101
102 ret = genradix_prealloc(&stream->in, incnt, gfp);
103 if (ret)
104 return ret;
105
106 stream->incnt = incnt;
107 return 0;
108 }
109
110 int sctp_stream_init(struct sctp_stream *stream, __u16 outcnt, __u16 incnt,
111 gfp_t gfp)
112 {
113 struct sctp_sched_ops *sched = sctp_sched_ops_from_stream(stream);
114 int i, ret = 0;
115
116 gfp |= __GFP_NOWARN;
117
118 /* Initial stream->out size may be very big, so free it and alloc
119 * a new one with new outcnt to save memory if needed.
120 */
121 if (outcnt == stream->outcnt)
122 goto in;
123
124 /* Filter out chunks queued on streams that won't exist anymore */
125 sched->unsched_all(stream);
126 sctp_stream_outq_migrate(stream, NULL, outcnt);
127 sched->sched_all(stream);
128
129 ret = sctp_stream_alloc_out(stream, outcnt, gfp);
130 if (ret)
131 goto out;
132
133 for (i = 0; i < stream->outcnt; i++)
134 SCTP_SO(stream, i)->state = SCTP_STREAM_OPEN;
135
136 in:
137 sctp_stream_interleave_init(stream);
138 if (!incnt)
139 goto out;
140
141 ret = sctp_stream_alloc_in(stream, incnt, gfp);
142 if (ret) {
143 sched->free(stream);
144 genradix_free(&stream->out);
145 stream->outcnt = 0;
146 goto out;
147 }
148
149 out:
150 return ret;
151 }
152
153 int sctp_stream_init_ext(struct sctp_stream *stream, __u16 sid)
154 {
155 struct sctp_stream_out_ext *soute;
156 int ret;
157
158 soute = kzalloc(sizeof(*soute), GFP_KERNEL);
159 if (!soute)
160 return -ENOMEM;
161 SCTP_SO(stream, sid)->ext = soute;
162
163 ret = sctp_sched_init_sid(stream, sid, GFP_KERNEL);
164 if (ret) {
165 kfree(SCTP_SO(stream, sid)->ext);
166 SCTP_SO(stream, sid)->ext = NULL;
167 }
168
169 return ret;
170 }
171
172 void sctp_stream_free(struct sctp_stream *stream)
173 {
174 struct sctp_sched_ops *sched = sctp_sched_ops_from_stream(stream);
175 int i;
176
177 sched->free(stream);
178 for (i = 0; i < stream->outcnt; i++)
179 kfree(SCTP_SO(stream, i)->ext);
180 genradix_free(&stream->out);
181 genradix_free(&stream->in);
182 }
183
184 void sctp_stream_clear(struct sctp_stream *stream)
185 {
186 int i;
187
188 for (i = 0; i < stream->outcnt; i++) {
189 SCTP_SO(stream, i)->mid = 0;
190 SCTP_SO(stream, i)->mid_uo = 0;
191 }
192
193 for (i = 0; i < stream->incnt; i++)
194 SCTP_SI(stream, i)->mid = 0;
195 }
196
197 void sctp_stream_update(struct sctp_stream *stream, struct sctp_stream *new)
198 {
199 struct sctp_sched_ops *sched = sctp_sched_ops_from_stream(stream);
200
201 sched->unsched_all(stream);
202 sctp_stream_outq_migrate(stream, new, new->outcnt);
203 sctp_stream_free(stream);
204
205 stream->out = new->out;
206 stream->in = new->in;
207 stream->outcnt = new->outcnt;
208 stream->incnt = new->incnt;
209
210 sched->sched_all(stream);
211
212 new->out.tree.root = NULL;
213 new->in.tree.root = NULL;
214 new->outcnt = 0;
215 new->incnt = 0;
216 }
217
218 static int sctp_send_reconf(struct sctp_association *asoc,
219 struct sctp_chunk *chunk)
220 {
221 struct net *net = sock_net(asoc->base.sk);
222 int retval = 0;
223
224 retval = sctp_primitive_RECONF(net, asoc, chunk);
225 if (retval)
226 sctp_chunk_free(chunk);
227
228 return retval;
229 }
230
231 static bool sctp_stream_outq_is_empty(struct sctp_stream *stream,
232 __u16 str_nums, __be16 *str_list)
233 {
234 struct sctp_association *asoc;
235 __u16 i;
236
237 asoc = container_of(stream, struct sctp_association, stream);
238 if (!asoc->outqueue.out_qlen)
239 return true;
240
241 if (!str_nums)
242 return false;
243
244 for (i = 0; i < str_nums; i++) {
245 __u16 sid = ntohs(str_list[i]);
246
247 if (SCTP_SO(stream, sid)->ext &&
248 !list_empty(&SCTP_SO(stream, sid)->ext->outq))
249 return false;
250 }
251
252 return true;
253 }
254
255 int sctp_send_reset_streams(struct sctp_association *asoc,
256 struct sctp_reset_streams *params)
257 {
258 struct sctp_stream *stream = &asoc->stream;
259 __u16 i, str_nums, *str_list;
260 struct sctp_chunk *chunk;
261 int retval = -EINVAL;
262 __be16 *nstr_list;
263 bool out, in;
264
265 if (!asoc->peer.reconf_capable ||
266 !(asoc->strreset_enable & SCTP_ENABLE_RESET_STREAM_REQ)) {
267 retval = -ENOPROTOOPT;
268 goto out;
269 }
270
271 if (asoc->strreset_outstanding) {
272 retval = -EINPROGRESS;
273 goto out;
274 }
275
276 out = params->srs_flags & SCTP_STREAM_RESET_OUTGOING;
277 in = params->srs_flags & SCTP_STREAM_RESET_INCOMING;
278 if (!out && !in)
279 goto out;
280
281 str_nums = params->srs_number_streams;
282 str_list = params->srs_stream_list;
283 if (str_nums) {
284 int param_len = 0;
285
286 if (out) {
287 for (i = 0; i < str_nums; i++)
288 if (str_list[i] >= stream->outcnt)
289 goto out;
290
291 param_len = str_nums * sizeof(__u16) +
292 sizeof(struct sctp_strreset_outreq);
293 }
294
295 if (in) {
296 for (i = 0; i < str_nums; i++)
297 if (str_list[i] >= stream->incnt)
298 goto out;
299
300 param_len += str_nums * sizeof(__u16) +
301 sizeof(struct sctp_strreset_inreq);
302 }
303
304 if (param_len > SCTP_MAX_CHUNK_LEN -
305 sizeof(struct sctp_reconf_chunk))
306 goto out;
307 }
308
309 nstr_list = kcalloc(str_nums, sizeof(__be16), GFP_KERNEL);
310 if (!nstr_list) {
311 retval = -ENOMEM;
312 goto out;
313 }
314
315 for (i = 0; i < str_nums; i++)
316 nstr_list[i] = htons(str_list[i]);
317
318 if (out && !sctp_stream_outq_is_empty(stream, str_nums, nstr_list)) {
319 kfree(nstr_list);
320 retval = -EAGAIN;
321 goto out;
322 }
323
324 chunk = sctp_make_strreset_req(asoc, str_nums, nstr_list, out, in);
325
326 kfree(nstr_list);
327
328 if (!chunk) {
329 retval = -ENOMEM;
330 goto out;
331 }
332
333 if (out) {
334 if (str_nums)
335 for (i = 0; i < str_nums; i++)
336 SCTP_SO(stream, str_list[i])->state =
337 SCTP_STREAM_CLOSED;
338 else
339 for (i = 0; i < stream->outcnt; i++)
340 SCTP_SO(stream, i)->state = SCTP_STREAM_CLOSED;
341 }
342
343 asoc->strreset_chunk = chunk;
344 sctp_chunk_hold(asoc->strreset_chunk);
345
346 retval = sctp_send_reconf(asoc, chunk);
347 if (retval) {
348 sctp_chunk_put(asoc->strreset_chunk);
349 asoc->strreset_chunk = NULL;
350 if (!out)
351 goto out;
352
353 if (str_nums)
354 for (i = 0; i < str_nums; i++)
355 SCTP_SO(stream, str_list[i])->state =
356 SCTP_STREAM_OPEN;
357 else
358 for (i = 0; i < stream->outcnt; i++)
359 SCTP_SO(stream, i)->state = SCTP_STREAM_OPEN;
360
361 goto out;
362 }
363
364 asoc->strreset_outstanding = out + in;
365
366 out:
367 return retval;
368 }
369
370 int sctp_send_reset_assoc(struct sctp_association *asoc)
371 {
372 struct sctp_stream *stream = &asoc->stream;
373 struct sctp_chunk *chunk = NULL;
374 int retval;
375 __u16 i;
376
377 if (!asoc->peer.reconf_capable ||
378 !(asoc->strreset_enable & SCTP_ENABLE_RESET_ASSOC_REQ))
379 return -ENOPROTOOPT;
380
381 if (asoc->strreset_outstanding)
382 return -EINPROGRESS;
383
384 if (!sctp_outq_is_empty(&asoc->outqueue))
385 return -EAGAIN;
386
387 chunk = sctp_make_strreset_tsnreq(asoc);
388 if (!chunk)
389 return -ENOMEM;
390
391 /* Block further xmit of data until this request is completed */
392 for (i = 0; i < stream->outcnt; i++)
393 SCTP_SO(stream, i)->state = SCTP_STREAM_CLOSED;
394
395 asoc->strreset_chunk = chunk;
396 sctp_chunk_hold(asoc->strreset_chunk);
397
398 retval = sctp_send_reconf(asoc, chunk);
399 if (retval) {
400 sctp_chunk_put(asoc->strreset_chunk);
401 asoc->strreset_chunk = NULL;
402
403 for (i = 0; i < stream->outcnt; i++)
404 SCTP_SO(stream, i)->state = SCTP_STREAM_OPEN;
405
406 return retval;
407 }
408
409 asoc->strreset_outstanding = 1;
410
411 return 0;
412 }
413
414 int sctp_send_add_streams(struct sctp_association *asoc,
415 struct sctp_add_streams *params)
416 {
417 struct sctp_stream *stream = &asoc->stream;
418 struct sctp_chunk *chunk = NULL;
419 int retval;
420 __u32 outcnt, incnt;
421 __u16 out, in;
422
423 if (!asoc->peer.reconf_capable ||
424 !(asoc->strreset_enable & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
425 retval = -ENOPROTOOPT;
426 goto out;
427 }
428
429 if (asoc->strreset_outstanding) {
430 retval = -EINPROGRESS;
431 goto out;
432 }
433
434 out = params->sas_outstrms;
435 in = params->sas_instrms;
436 outcnt = stream->outcnt + out;
437 incnt = stream->incnt + in;
438 if (outcnt > SCTP_MAX_STREAM || incnt > SCTP_MAX_STREAM ||
439 (!out && !in)) {
440 retval = -EINVAL;
441 goto out;
442 }
443
444 if (out) {
445 retval = sctp_stream_alloc_out(stream, outcnt, GFP_KERNEL);
446 if (retval)
447 goto out;
448 }
449
450 chunk = sctp_make_strreset_addstrm(asoc, out, in);
451 if (!chunk) {
452 retval = -ENOMEM;
453 goto out;
454 }
455
456 asoc->strreset_chunk = chunk;
457 sctp_chunk_hold(asoc->strreset_chunk);
458
459 retval = sctp_send_reconf(asoc, chunk);
460 if (retval) {
461 sctp_chunk_put(asoc->strreset_chunk);
462 asoc->strreset_chunk = NULL;
463 goto out;
464 }
465
466 asoc->strreset_outstanding = !!out + !!in;
467
468 out:
469 return retval;
470 }
471
472 static struct sctp_paramhdr *sctp_chunk_lookup_strreset_param(
473 struct sctp_association *asoc, __be32 resp_seq,
474 __be16 type)
475 {
476 struct sctp_chunk *chunk = asoc->strreset_chunk;
477 struct sctp_reconf_chunk *hdr;
478 union sctp_params param;
479
480 if (!chunk)
481 return NULL;
482
483 hdr = (struct sctp_reconf_chunk *)chunk->chunk_hdr;
484 sctp_walk_params(param, hdr, params) {
485 /* sctp_strreset_tsnreq is actually the basic structure
486 * of all stream reconf params, so it's safe to use it
487 * to access request_seq.
488 */
489 struct sctp_strreset_tsnreq *req = param.v;
490
491 if ((!resp_seq || req->request_seq == resp_seq) &&
492 (!type || type == req->param_hdr.type))
493 return param.v;
494 }
495
496 return NULL;
497 }
498
499 static void sctp_update_strreset_result(struct sctp_association *asoc,
500 __u32 result)
501 {
502 asoc->strreset_result[1] = asoc->strreset_result[0];
503 asoc->strreset_result[0] = result;
504 }
505
506 struct sctp_chunk *sctp_process_strreset_outreq(
507 struct sctp_association *asoc,
508 union sctp_params param,
509 struct sctp_ulpevent **evp)
510 {
511 struct sctp_strreset_outreq *outreq = param.v;
512 struct sctp_stream *stream = &asoc->stream;
513 __u32 result = SCTP_STRRESET_DENIED;
514 __be16 *str_p = NULL;
515 __u32 request_seq;
516 __u16 i, nums;
517
518 request_seq = ntohl(outreq->request_seq);
519
520 if (ntohl(outreq->send_reset_at_tsn) >
521 sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map)) {
522 result = SCTP_STRRESET_IN_PROGRESS;
523 goto err;
524 }
525
526 if (TSN_lt(asoc->strreset_inseq, request_seq) ||
527 TSN_lt(request_seq, asoc->strreset_inseq - 2)) {
528 result = SCTP_STRRESET_ERR_BAD_SEQNO;
529 goto err;
530 } else if (TSN_lt(request_seq, asoc->strreset_inseq)) {
531 i = asoc->strreset_inseq - request_seq - 1;
532 result = asoc->strreset_result[i];
533 goto err;
534 }
535 asoc->strreset_inseq++;
536
537 /* Check strreset_enable after inseq inc, as sender cannot tell
538 * the peer doesn't enable strreset after receiving response with
539 * result denied, as well as to keep consistent with bsd.
540 */
541 if (!(asoc->strreset_enable & SCTP_ENABLE_RESET_STREAM_REQ))
542 goto out;
543
544 nums = (ntohs(param.p->length) - sizeof(*outreq)) / sizeof(__u16);
545 str_p = outreq->list_of_streams;
546 for (i = 0; i < nums; i++) {
547 if (ntohs(str_p[i]) >= stream->incnt) {
548 result = SCTP_STRRESET_ERR_WRONG_SSN;
549 goto out;
550 }
551 }
552
553 if (asoc->strreset_chunk) {
554 if (!sctp_chunk_lookup_strreset_param(
555 asoc, outreq->response_seq,
556 SCTP_PARAM_RESET_IN_REQUEST)) {
557 /* same process with outstanding isn't 0 */
558 result = SCTP_STRRESET_ERR_IN_PROGRESS;
559 goto out;
560 }
561
562 asoc->strreset_outstanding--;
563 asoc->strreset_outseq++;
564
565 if (!asoc->strreset_outstanding) {
566 struct sctp_transport *t;
567
568 t = asoc->strreset_chunk->transport;
569 if (del_timer(&t->reconf_timer))
570 sctp_transport_put(t);
571
572 sctp_chunk_put(asoc->strreset_chunk);
573 asoc->strreset_chunk = NULL;
574 }
575 }
576
577 if (nums)
578 for (i = 0; i < nums; i++)
579 SCTP_SI(stream, ntohs(str_p[i]))->mid = 0;
580 else
581 for (i = 0; i < stream->incnt; i++)
582 SCTP_SI(stream, i)->mid = 0;
583
584 result = SCTP_STRRESET_PERFORMED;
585
586 *evp = sctp_ulpevent_make_stream_reset_event(asoc,
587 SCTP_STREAM_RESET_INCOMING_SSN, nums, str_p, GFP_ATOMIC);
588
589 out:
590 sctp_update_strreset_result(asoc, result);
591 err:
592 return sctp_make_strreset_resp(asoc, result, request_seq);
593 }
594
595 struct sctp_chunk *sctp_process_strreset_inreq(
596 struct sctp_association *asoc,
597 union sctp_params param,
598 struct sctp_ulpevent **evp)
599 {
600 struct sctp_strreset_inreq *inreq = param.v;
601 struct sctp_stream *stream = &asoc->stream;
602 __u32 result = SCTP_STRRESET_DENIED;
603 struct sctp_chunk *chunk = NULL;
604 __u32 request_seq;
605 __u16 i, nums;
606 __be16 *str_p;
607
608 request_seq = ntohl(inreq->request_seq);
609 if (TSN_lt(asoc->strreset_inseq, request_seq) ||
610 TSN_lt(request_seq, asoc->strreset_inseq - 2)) {
611 result = SCTP_STRRESET_ERR_BAD_SEQNO;
612 goto err;
613 } else if (TSN_lt(request_seq, asoc->strreset_inseq)) {
614 i = asoc->strreset_inseq - request_seq - 1;
615 result = asoc->strreset_result[i];
616 if (result == SCTP_STRRESET_PERFORMED)
617 return NULL;
618 goto err;
619 }
620 asoc->strreset_inseq++;
621
622 if (!(asoc->strreset_enable & SCTP_ENABLE_RESET_STREAM_REQ))
623 goto out;
624
625 if (asoc->strreset_outstanding) {
626 result = SCTP_STRRESET_ERR_IN_PROGRESS;
627 goto out;
628 }
629
630 nums = (ntohs(param.p->length) - sizeof(*inreq)) / sizeof(__u16);
631 str_p = inreq->list_of_streams;
632 for (i = 0; i < nums; i++) {
633 if (ntohs(str_p[i]) >= stream->outcnt) {
634 result = SCTP_STRRESET_ERR_WRONG_SSN;
635 goto out;
636 }
637 }
638
639 if (!sctp_stream_outq_is_empty(stream, nums, str_p)) {
640 result = SCTP_STRRESET_IN_PROGRESS;
641 asoc->strreset_inseq--;
642 goto err;
643 }
644
645 chunk = sctp_make_strreset_req(asoc, nums, str_p, 1, 0);
646 if (!chunk)
647 goto out;
648
649 if (nums)
650 for (i = 0; i < nums; i++)
651 SCTP_SO(stream, ntohs(str_p[i]))->state =
652 SCTP_STREAM_CLOSED;
653 else
654 for (i = 0; i < stream->outcnt; i++)
655 SCTP_SO(stream, i)->state = SCTP_STREAM_CLOSED;
656
657 asoc->strreset_chunk = chunk;
658 asoc->strreset_outstanding = 1;
659 sctp_chunk_hold(asoc->strreset_chunk);
660
661 result = SCTP_STRRESET_PERFORMED;
662
663 out:
664 sctp_update_strreset_result(asoc, result);
665 err:
666 if (!chunk)
667 chunk = sctp_make_strreset_resp(asoc, result, request_seq);
668
669 return chunk;
670 }
671
672 struct sctp_chunk *sctp_process_strreset_tsnreq(
673 struct sctp_association *asoc,
674 union sctp_params param,
675 struct sctp_ulpevent **evp)
676 {
677 __u32 init_tsn = 0, next_tsn = 0, max_tsn_seen;
678 struct sctp_strreset_tsnreq *tsnreq = param.v;
679 struct sctp_stream *stream = &asoc->stream;
680 __u32 result = SCTP_STRRESET_DENIED;
681 __u32 request_seq;
682 __u16 i;
683
684 request_seq = ntohl(tsnreq->request_seq);
685 if (TSN_lt(asoc->strreset_inseq, request_seq) ||
686 TSN_lt(request_seq, asoc->strreset_inseq - 2)) {
687 result = SCTP_STRRESET_ERR_BAD_SEQNO;
688 goto err;
689 } else if (TSN_lt(request_seq, asoc->strreset_inseq)) {
690 i = asoc->strreset_inseq - request_seq - 1;
691 result = asoc->strreset_result[i];
692 if (result == SCTP_STRRESET_PERFORMED) {
693 next_tsn = asoc->ctsn_ack_point + 1;
694 init_tsn =
695 sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map) + 1;
696 }
697 goto err;
698 }
699
700 if (!sctp_outq_is_empty(&asoc->outqueue)) {
701 result = SCTP_STRRESET_IN_PROGRESS;
702 goto err;
703 }
704
705 asoc->strreset_inseq++;
706
707 if (!(asoc->strreset_enable & SCTP_ENABLE_RESET_ASSOC_REQ))
708 goto out;
709
710 if (asoc->strreset_outstanding) {
711 result = SCTP_STRRESET_ERR_IN_PROGRESS;
712 goto out;
713 }
714
715 /* G4: The same processing as though a FWD-TSN chunk (as defined in
716 * [RFC3758]) with all streams affected and a new cumulative TSN
717 * ACK of the Receiver's Next TSN minus 1 were received MUST be
718 * performed.
719 */
720 max_tsn_seen = sctp_tsnmap_get_max_tsn_seen(&asoc->peer.tsn_map);
721 asoc->stream.si->report_ftsn(&asoc->ulpq, max_tsn_seen);
722
723 /* G1: Compute an appropriate value for the Receiver's Next TSN -- the
724 * TSN that the peer should use to send the next DATA chunk. The
725 * value SHOULD be the smallest TSN not acknowledged by the
726 * receiver of the request plus 2^31.
727 */
728 init_tsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map) + (1 << 31);
729 sctp_tsnmap_init(&asoc->peer.tsn_map, SCTP_TSN_MAP_INITIAL,
730 init_tsn, GFP_ATOMIC);
731
732 /* G3: The same processing as though a SACK chunk with no gap report
733 * and a cumulative TSN ACK of the Sender's Next TSN minus 1 were
734 * received MUST be performed.
735 */
736 sctp_outq_free(&asoc->outqueue);
737
738 /* G2: Compute an appropriate value for the local endpoint's next TSN,
739 * i.e., the next TSN assigned by the receiver of the SSN/TSN reset
740 * chunk. The value SHOULD be the highest TSN sent by the receiver
741 * of the request plus 1.
742 */
743 next_tsn = asoc->next_tsn;
744 asoc->ctsn_ack_point = next_tsn - 1;
745 asoc->adv_peer_ack_point = asoc->ctsn_ack_point;
746
747 /* G5: The next expected and outgoing SSNs MUST be reset to 0 for all
748 * incoming and outgoing streams.
749 */
750 for (i = 0; i < stream->outcnt; i++) {
751 SCTP_SO(stream, i)->mid = 0;
752 SCTP_SO(stream, i)->mid_uo = 0;
753 }
754 for (i = 0; i < stream->incnt; i++)
755 SCTP_SI(stream, i)->mid = 0;
756
757 result = SCTP_STRRESET_PERFORMED;
758
759 *evp = sctp_ulpevent_make_assoc_reset_event(asoc, 0, init_tsn,
760 next_tsn, GFP_ATOMIC);
761
762 out:
763 sctp_update_strreset_result(asoc, result);
764 err:
765 return sctp_make_strreset_tsnresp(asoc, result, request_seq,
766 next_tsn, init_tsn);
767 }
768
769 struct sctp_chunk *sctp_process_strreset_addstrm_out(
770 struct sctp_association *asoc,
771 union sctp_params param,
772 struct sctp_ulpevent **evp)
773 {
774 struct sctp_strreset_addstrm *addstrm = param.v;
775 struct sctp_stream *stream = &asoc->stream;
776 __u32 result = SCTP_STRRESET_DENIED;
777 __u32 request_seq, incnt;
778 __u16 in, i;
779
780 request_seq = ntohl(addstrm->request_seq);
781 if (TSN_lt(asoc->strreset_inseq, request_seq) ||
782 TSN_lt(request_seq, asoc->strreset_inseq - 2)) {
783 result = SCTP_STRRESET_ERR_BAD_SEQNO;
784 goto err;
785 } else if (TSN_lt(request_seq, asoc->strreset_inseq)) {
786 i = asoc->strreset_inseq - request_seq - 1;
787 result = asoc->strreset_result[i];
788 goto err;
789 }
790 asoc->strreset_inseq++;
791
792 if (!(asoc->strreset_enable & SCTP_ENABLE_CHANGE_ASSOC_REQ))
793 goto out;
794
795 in = ntohs(addstrm->number_of_streams);
796 incnt = stream->incnt + in;
797 if (!in || incnt > SCTP_MAX_STREAM)
798 goto out;
799
800 if (sctp_stream_alloc_in(stream, incnt, GFP_ATOMIC))
801 goto out;
802
803 if (asoc->strreset_chunk) {
804 if (!sctp_chunk_lookup_strreset_param(
805 asoc, 0, SCTP_PARAM_RESET_ADD_IN_STREAMS)) {
806 /* same process with outstanding isn't 0 */
807 result = SCTP_STRRESET_ERR_IN_PROGRESS;
808 goto out;
809 }
810
811 asoc->strreset_outstanding--;
812 asoc->strreset_outseq++;
813
814 if (!asoc->strreset_outstanding) {
815 struct sctp_transport *t;
816
817 t = asoc->strreset_chunk->transport;
818 if (del_timer(&t->reconf_timer))
819 sctp_transport_put(t);
820
821 sctp_chunk_put(asoc->strreset_chunk);
822 asoc->strreset_chunk = NULL;
823 }
824 }
825
826 stream->incnt = incnt;
827
828 result = SCTP_STRRESET_PERFORMED;
829
830 *evp = sctp_ulpevent_make_stream_change_event(asoc,
831 0, ntohs(addstrm->number_of_streams), 0, GFP_ATOMIC);
832
833 out:
834 sctp_update_strreset_result(asoc, result);
835 err:
836 return sctp_make_strreset_resp(asoc, result, request_seq);
837 }
838
839 struct sctp_chunk *sctp_process_strreset_addstrm_in(
840 struct sctp_association *asoc,
841 union sctp_params param,
842 struct sctp_ulpevent **evp)
843 {
844 struct sctp_strreset_addstrm *addstrm = param.v;
845 struct sctp_stream *stream = &asoc->stream;
846 __u32 result = SCTP_STRRESET_DENIED;
847 struct sctp_chunk *chunk = NULL;
848 __u32 request_seq, outcnt;
849 __u16 out, i;
850 int ret;
851
852 request_seq = ntohl(addstrm->request_seq);
853 if (TSN_lt(asoc->strreset_inseq, request_seq) ||
854 TSN_lt(request_seq, asoc->strreset_inseq - 2)) {
855 result = SCTP_STRRESET_ERR_BAD_SEQNO;
856 goto err;
857 } else if (TSN_lt(request_seq, asoc->strreset_inseq)) {
858 i = asoc->strreset_inseq - request_seq - 1;
859 result = asoc->strreset_result[i];
860 if (result == SCTP_STRRESET_PERFORMED)
861 return NULL;
862 goto err;
863 }
864 asoc->strreset_inseq++;
865
866 if (!(asoc->strreset_enable & SCTP_ENABLE_CHANGE_ASSOC_REQ))
867 goto out;
868
869 if (asoc->strreset_outstanding) {
870 result = SCTP_STRRESET_ERR_IN_PROGRESS;
871 goto out;
872 }
873
874 out = ntohs(addstrm->number_of_streams);
875 outcnt = stream->outcnt + out;
876 if (!out || outcnt > SCTP_MAX_STREAM)
877 goto out;
878
879 ret = sctp_stream_alloc_out(stream, outcnt, GFP_ATOMIC);
880 if (ret)
881 goto out;
882
883 chunk = sctp_make_strreset_addstrm(asoc, out, 0);
884 if (!chunk)
885 goto out;
886
887 asoc->strreset_chunk = chunk;
888 asoc->strreset_outstanding = 1;
889 sctp_chunk_hold(asoc->strreset_chunk);
890
891 stream->outcnt = outcnt;
892
893 result = SCTP_STRRESET_PERFORMED;
894
895 out:
896 sctp_update_strreset_result(asoc, result);
897 err:
898 if (!chunk)
899 chunk = sctp_make_strreset_resp(asoc, result, request_seq);
900
901 return chunk;
902 }
903
904 struct sctp_chunk *sctp_process_strreset_resp(
905 struct sctp_association *asoc,
906 union sctp_params param,
907 struct sctp_ulpevent **evp)
908 {
909 struct sctp_stream *stream = &asoc->stream;
910 struct sctp_strreset_resp *resp = param.v;
911 struct sctp_transport *t;
912 __u16 i, nums, flags = 0;
913 struct sctp_paramhdr *req;
914 __u32 result;
915
916 req = sctp_chunk_lookup_strreset_param(asoc, resp->response_seq, 0);
917 if (!req)
918 return NULL;
919
920 result = ntohl(resp->result);
921 if (result != SCTP_STRRESET_PERFORMED) {
922 /* if in progress, do nothing but retransmit */
923 if (result == SCTP_STRRESET_IN_PROGRESS)
924 return NULL;
925 else if (result == SCTP_STRRESET_DENIED)
926 flags = SCTP_STREAM_RESET_DENIED;
927 else
928 flags = SCTP_STREAM_RESET_FAILED;
929 }
930
931 if (req->type == SCTP_PARAM_RESET_OUT_REQUEST) {
932 struct sctp_strreset_outreq *outreq;
933 __be16 *str_p;
934
935 outreq = (struct sctp_strreset_outreq *)req;
936 str_p = outreq->list_of_streams;
937 nums = (ntohs(outreq->param_hdr.length) - sizeof(*outreq)) /
938 sizeof(__u16);
939
940 if (result == SCTP_STRRESET_PERFORMED) {
941 struct sctp_stream_out *sout;
942 if (nums) {
943 for (i = 0; i < nums; i++) {
944 sout = SCTP_SO(stream, ntohs(str_p[i]));
945 sout->mid = 0;
946 sout->mid_uo = 0;
947 }
948 } else {
949 for (i = 0; i < stream->outcnt; i++) {
950 sout = SCTP_SO(stream, i);
951 sout->mid = 0;
952 sout->mid_uo = 0;
953 }
954 }
955 }
956
957 flags |= SCTP_STREAM_RESET_OUTGOING_SSN;
958
959 for (i = 0; i < stream->outcnt; i++)
960 SCTP_SO(stream, i)->state = SCTP_STREAM_OPEN;
961
962 *evp = sctp_ulpevent_make_stream_reset_event(asoc, flags,
963 nums, str_p, GFP_ATOMIC);
964 } else if (req->type == SCTP_PARAM_RESET_IN_REQUEST) {
965 struct sctp_strreset_inreq *inreq;
966 __be16 *str_p;
967
968 /* if the result is performed, it's impossible for inreq */
969 if (result == SCTP_STRRESET_PERFORMED)
970 return NULL;
971
972 inreq = (struct sctp_strreset_inreq *)req;
973 str_p = inreq->list_of_streams;
974 nums = (ntohs(inreq->param_hdr.length) - sizeof(*inreq)) /
975 sizeof(__u16);
976
977 flags |= SCTP_STREAM_RESET_INCOMING_SSN;
978
979 *evp = sctp_ulpevent_make_stream_reset_event(asoc, flags,
980 nums, str_p, GFP_ATOMIC);
981 } else if (req->type == SCTP_PARAM_RESET_TSN_REQUEST) {
982 struct sctp_strreset_resptsn *resptsn;
983 __u32 stsn, rtsn;
984
985 /* check for resptsn, as sctp_verify_reconf didn't do it*/
986 if (ntohs(param.p->length) != sizeof(*resptsn))
987 return NULL;
988
989 resptsn = (struct sctp_strreset_resptsn *)resp;
990 stsn = ntohl(resptsn->senders_next_tsn);
991 rtsn = ntohl(resptsn->receivers_next_tsn);
992
993 if (result == SCTP_STRRESET_PERFORMED) {
994 __u32 mtsn = sctp_tsnmap_get_max_tsn_seen(
995 &asoc->peer.tsn_map);
996 LIST_HEAD(temp);
997
998 asoc->stream.si->report_ftsn(&asoc->ulpq, mtsn);
999
1000 sctp_tsnmap_init(&asoc->peer.tsn_map,
1001 SCTP_TSN_MAP_INITIAL,
1002 stsn, GFP_ATOMIC);
1003
1004 /* Clean up sacked and abandoned queues only. As the
1005 * out_chunk_list may not be empty, splice it to temp,
1006 * then get it back after sctp_outq_free is done.
1007 */
1008 list_splice_init(&asoc->outqueue.out_chunk_list, &temp);
1009 sctp_outq_free(&asoc->outqueue);
1010 list_splice_init(&temp, &asoc->outqueue.out_chunk_list);
1011
1012 asoc->next_tsn = rtsn;
1013 asoc->ctsn_ack_point = asoc->next_tsn - 1;
1014 asoc->adv_peer_ack_point = asoc->ctsn_ack_point;
1015
1016 for (i = 0; i < stream->outcnt; i++) {
1017 SCTP_SO(stream, i)->mid = 0;
1018 SCTP_SO(stream, i)->mid_uo = 0;
1019 }
1020 for (i = 0; i < stream->incnt; i++)
1021 SCTP_SI(stream, i)->mid = 0;
1022 }
1023
1024 for (i = 0; i < stream->outcnt; i++)
1025 SCTP_SO(stream, i)->state = SCTP_STREAM_OPEN;
1026
1027 *evp = sctp_ulpevent_make_assoc_reset_event(asoc, flags,
1028 stsn, rtsn, GFP_ATOMIC);
1029 } else if (req->type == SCTP_PARAM_RESET_ADD_OUT_STREAMS) {
1030 struct sctp_strreset_addstrm *addstrm;
1031 __u16 number;
1032
1033 addstrm = (struct sctp_strreset_addstrm *)req;
1034 nums = ntohs(addstrm->number_of_streams);
1035 number = stream->outcnt - nums;
1036
1037 if (result == SCTP_STRRESET_PERFORMED)
1038 for (i = number; i < stream->outcnt; i++)
1039 SCTP_SO(stream, i)->state = SCTP_STREAM_OPEN;
1040 else
1041 stream->outcnt = number;
1042
1043 *evp = sctp_ulpevent_make_stream_change_event(asoc, flags,
1044 0, nums, GFP_ATOMIC);
1045 } else if (req->type == SCTP_PARAM_RESET_ADD_IN_STREAMS) {
1046 struct sctp_strreset_addstrm *addstrm;
1047
1048 /* if the result is performed, it's impossible for addstrm in
1049 * request.
1050 */
1051 if (result == SCTP_STRRESET_PERFORMED)
1052 return NULL;
1053
1054 addstrm = (struct sctp_strreset_addstrm *)req;
1055 nums = ntohs(addstrm->number_of_streams);
1056
1057 *evp = sctp_ulpevent_make_stream_change_event(asoc, flags,
1058 nums, 0, GFP_ATOMIC);
1059 }
1060
1061 asoc->strreset_outstanding--;
1062 asoc->strreset_outseq++;
1063
1064 /* remove everything for this reconf request */
1065 if (!asoc->strreset_outstanding) {
1066 t = asoc->strreset_chunk->transport;
1067 if (del_timer(&t->reconf_timer))
1068 sctp_transport_put(t);
1069
1070 sctp_chunk_put(asoc->strreset_chunk);
1071 asoc->strreset_chunk = NULL;
1072 }
1073
1074 return NULL;
1075 }
connection oriented routing