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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
25static void sctp_stream_shrink_out(struct sctp_stream *stream, __u16 outcnt)
26{
27 struct sctp_association *asoc;
28 struct sctp_chunk *ch, *temp;
29 struct sctp_outq *outq;
30
31 asoc = container_of(stream, struct sctp_association, stream);
32 outq = &asoc->outqueue;
33
34 list_for_each_entry_safe(ch, temp, &outq->out_chunk_list, list) {
35 __u16 sid = sctp_chunk_stream_no(ch);
36
37 if (sid < outcnt)
38 continue;
39
40 sctp_sched_dequeue_common(outq, ch);
41 /* No need to call dequeue_done here because
42 * the chunks are not scheduled by now.
43 */
44
45 /* Mark as failed send. */
46 sctp_chunk_fail(ch, (__force __u32)SCTP_ERROR_INV_STRM);
47 if (asoc->peer.prsctp_capable &&
48 SCTP_PR_PRIO_ENABLED(ch->sinfo.sinfo_flags))
49 asoc->sent_cnt_removable--;
50
51 sctp_chunk_free(ch);
52 }
53}
54
55static void sctp_stream_free_ext(struct sctp_stream *stream, __u16 sid)
56{
57 struct sctp_sched_ops *sched;
58
59 if (!SCTP_SO(stream, sid)->ext)
60 return;
61
62 sched = sctp_sched_ops_from_stream(stream);
63 sched->free_sid(stream, sid);
64 kfree(SCTP_SO(stream, sid)->ext);
65 SCTP_SO(stream, sid)->ext = NULL;
66}
67
68/* Migrates chunks from stream queues to new stream queues if needed,
69 * but not across associations. Also, removes those chunks to streams
70 * higher than the new max.
71 */
72static void sctp_stream_outq_migrate(struct sctp_stream *stream,
73 struct sctp_stream *new, __u16 outcnt)
74{
75 int i;
76
77 if (stream->outcnt > outcnt)
78 sctp_stream_shrink_out(stream, outcnt);
79
80 if (new) {
81 /* Here we actually move the old ext stuff into the new
82 * buffer, because we want to keep it. Then
83 * sctp_stream_update will swap ->out pointers.
84 */
85 for (i = 0; i < outcnt; i++) {
86 sctp_stream_free_ext(new, i);
87 SCTP_SO(new, i)->ext = SCTP_SO(stream, i)->ext;
88 SCTP_SO(stream, i)->ext = NULL;
89 }
90 }
91
92 for (i = outcnt; i < stream->outcnt; i++)
93 sctp_stream_free_ext(stream, i);
94}
95
96static int sctp_stream_alloc_out(struct sctp_stream *stream, __u16 outcnt,
97 gfp_t gfp)
98{
99 int ret;
100
101 if (outcnt <= stream->outcnt)
102 goto out;
103
104 ret = genradix_prealloc(&stream->out, outcnt, gfp);
105 if (ret)
106 return ret;
107
108out:
109 stream->outcnt = outcnt;
110 return 0;
111}
112
113static int sctp_stream_alloc_in(struct sctp_stream *stream, __u16 incnt,
114 gfp_t gfp)
115{
116 int ret;
117
118 if (incnt <= stream->incnt)
119 goto out;
120
121 ret = genradix_prealloc(&stream->in, incnt, gfp);
122 if (ret)
123 return ret;
124
125out:
126 stream->incnt = incnt;
127 return 0;
128}
129
130int sctp_stream_init(struct sctp_stream *stream, __u16 outcnt, __u16 incnt,
131 gfp_t gfp)
132{
133 struct sctp_sched_ops *sched = sctp_sched_ops_from_stream(stream);
134 int i, ret = 0;
135
136 gfp |= __GFP_NOWARN;
137
138 /* Initial stream->out size may be very big, so free it and alloc
139 * a new one with new outcnt to save memory if needed.
140 */
141 if (outcnt == stream->outcnt)
142 goto handle_in;
143
144 /* Filter out chunks queued on streams that won't exist anymore */
145 sched->unsched_all(stream);
146 sctp_stream_outq_migrate(stream, NULL, outcnt);
147 sched->sched_all(stream);
148
149 ret = sctp_stream_alloc_out(stream, outcnt, gfp);
150 if (ret)
151 return ret;
152
153 for (i = 0; i < stream->outcnt; i++)
154 SCTP_SO(stream, i)->state = SCTP_STREAM_OPEN;
155
156handle_in:
157 sctp_stream_interleave_init(stream);
158 if (!incnt)
159 return 0;
160
161 return sctp_stream_alloc_in(stream, incnt, gfp);
162}
163
164int sctp_stream_init_ext(struct sctp_stream *stream, __u16 sid)
165{
166 struct sctp_stream_out_ext *soute;
167 int ret;
168
169 soute = kzalloc(sizeof(*soute), GFP_KERNEL);
170 if (!soute)
171 return -ENOMEM;
172 SCTP_SO(stream, sid)->ext = soute;
173
174 ret = sctp_sched_init_sid(stream, sid, GFP_KERNEL);
175 if (ret) {
176 kfree(SCTP_SO(stream, sid)->ext);
177 SCTP_SO(stream, sid)->ext = NULL;
178 }
179
180 return ret;
181}
182
183void sctp_stream_free(struct sctp_stream *stream)
184{
185 struct sctp_sched_ops *sched = sctp_sched_ops_from_stream(stream);
186 int i;
187
188 sched->unsched_all(stream);
189 for (i = 0; i < stream->outcnt; i++)
190 sctp_stream_free_ext(stream, i);
191 genradix_free(&stream->out);
192 genradix_free(&stream->in);
193}
194
195void sctp_stream_clear(struct sctp_stream *stream)
196{
197 int i;
198
199 for (i = 0; i < stream->outcnt; i++) {
200 SCTP_SO(stream, i)->mid = 0;
201 SCTP_SO(stream, i)->mid_uo = 0;
202 }
203
204 for (i = 0; i < stream->incnt; i++)
205 SCTP_SI(stream, i)->mid = 0;
206}
207
208void sctp_stream_update(struct sctp_stream *stream, struct sctp_stream *new)
209{
210 struct sctp_sched_ops *sched = sctp_sched_ops_from_stream(stream);
211
212 sched->unsched_all(stream);
213 sctp_stream_outq_migrate(stream, new, new->outcnt);
214 sctp_stream_free(stream);
215
216 stream->out = new->out;
217 stream->in = new->in;
218 stream->outcnt = new->outcnt;
219 stream->incnt = new->incnt;
220
221 sched->sched_all(stream);
222
223 new->out.tree.root = NULL;
224 new->in.tree.root = NULL;
225 new->outcnt = 0;
226 new->incnt = 0;
227}
228
229static int sctp_send_reconf(struct sctp_association *asoc,
230 struct sctp_chunk *chunk)
231{
232 int retval = 0;
233
234 retval = sctp_primitive_RECONF(asoc->base.net, asoc, chunk);
235 if (retval)
236 sctp_chunk_free(chunk);
237
238 return retval;
239}
240
241static bool sctp_stream_outq_is_empty(struct sctp_stream *stream,
242 __u16 str_nums, __be16 *str_list)
243{
244 struct sctp_association *asoc;
245 __u16 i;
246
247 asoc = container_of(stream, struct sctp_association, stream);
248 if (!asoc->outqueue.out_qlen)
249 return true;
250
251 if (!str_nums)
252 return false;
253
254 for (i = 0; i < str_nums; i++) {
255 __u16 sid = ntohs(str_list[i]);
256
257 if (SCTP_SO(stream, sid)->ext &&
258 !list_empty(&SCTP_SO(stream, sid)->ext->outq))
259 return false;
260 }
261
262 return true;
263}
264
265int sctp_send_reset_streams(struct sctp_association *asoc,
266 struct sctp_reset_streams *params)
267{
268 struct sctp_stream *stream = &asoc->stream;
269 __u16 i, str_nums, *str_list;
270 struct sctp_chunk *chunk;
271 int retval = -EINVAL;
272 __be16 *nstr_list;
273 bool out, in;
274
275 if (!asoc->peer.reconf_capable ||
276 !(asoc->strreset_enable & SCTP_ENABLE_RESET_STREAM_REQ)) {
277 retval = -ENOPROTOOPT;
278 goto out;
279 }
280
281 if (asoc->strreset_outstanding) {
282 retval = -EINPROGRESS;
283 goto out;
284 }
285
286 out = params->srs_flags & SCTP_STREAM_RESET_OUTGOING;
287 in = params->srs_flags & SCTP_STREAM_RESET_INCOMING;
288 if (!out && !in)
289 goto out;
290
291 str_nums = params->srs_number_streams;
292 str_list = params->srs_stream_list;
293 if (str_nums) {
294 int param_len = 0;
295
296 if (out) {
297 for (i = 0; i < str_nums; i++)
298 if (str_list[i] >= stream->outcnt)
299 goto out;
300
301 param_len = str_nums * sizeof(__u16) +
302 sizeof(struct sctp_strreset_outreq);
303 }
304
305 if (in) {
306 for (i = 0; i < str_nums; i++)
307 if (str_list[i] >= stream->incnt)
308 goto out;
309
310 param_len += str_nums * sizeof(__u16) +
311 sizeof(struct sctp_strreset_inreq);
312 }
313
314 if (param_len > SCTP_MAX_CHUNK_LEN -
315 sizeof(struct sctp_reconf_chunk))
316 goto out;
317 }
318
319 nstr_list = kcalloc(str_nums, sizeof(__be16), GFP_KERNEL);
320 if (!nstr_list) {
321 retval = -ENOMEM;
322 goto out;
323 }
324
325 for (i = 0; i < str_nums; i++)
326 nstr_list[i] = htons(str_list[i]);
327
328 if (out && !sctp_stream_outq_is_empty(stream, str_nums, nstr_list)) {
329 kfree(nstr_list);
330 retval = -EAGAIN;
331 goto out;
332 }
333
334 chunk = sctp_make_strreset_req(asoc, str_nums, nstr_list, out, in);
335
336 kfree(nstr_list);
337
338 if (!chunk) {
339 retval = -ENOMEM;
340 goto out;
341 }
342
343 if (out) {
344 if (str_nums)
345 for (i = 0; i < str_nums; i++)
346 SCTP_SO(stream, str_list[i])->state =
347 SCTP_STREAM_CLOSED;
348 else
349 for (i = 0; i < stream->outcnt; i++)
350 SCTP_SO(stream, i)->state = SCTP_STREAM_CLOSED;
351 }
352
353 asoc->strreset_chunk = chunk;
354 sctp_chunk_hold(asoc->strreset_chunk);
355
356 retval = sctp_send_reconf(asoc, chunk);
357 if (retval) {
358 sctp_chunk_put(asoc->strreset_chunk);
359 asoc->strreset_chunk = NULL;
360 if (!out)
361 goto out;
362
363 if (str_nums)
364 for (i = 0; i < str_nums; i++)
365 SCTP_SO(stream, str_list[i])->state =
366 SCTP_STREAM_OPEN;
367 else
368 for (i = 0; i < stream->outcnt; i++)
369 SCTP_SO(stream, i)->state = SCTP_STREAM_OPEN;
370
371 goto out;
372 }
373
374 asoc->strreset_outstanding = out + in;
375
376out:
377 return retval;
378}
379
380int sctp_send_reset_assoc(struct sctp_association *asoc)
381{
382 struct sctp_stream *stream = &asoc->stream;
383 struct sctp_chunk *chunk = NULL;
384 int retval;
385 __u16 i;
386
387 if (!asoc->peer.reconf_capable ||
388 !(asoc->strreset_enable & SCTP_ENABLE_RESET_ASSOC_REQ))
389 return -ENOPROTOOPT;
390
391 if (asoc->strreset_outstanding)
392 return -EINPROGRESS;
393
394 if (!sctp_outq_is_empty(&asoc->outqueue))
395 return -EAGAIN;
396
397 chunk = sctp_make_strreset_tsnreq(asoc);
398 if (!chunk)
399 return -ENOMEM;
400
401 /* Block further xmit of data until this request is completed */
402 for (i = 0; i < stream->outcnt; i++)
403 SCTP_SO(stream, i)->state = SCTP_STREAM_CLOSED;
404
405 asoc->strreset_chunk = chunk;
406 sctp_chunk_hold(asoc->strreset_chunk);
407
408 retval = sctp_send_reconf(asoc, chunk);
409 if (retval) {
410 sctp_chunk_put(asoc->strreset_chunk);
411 asoc->strreset_chunk = NULL;
412
413 for (i = 0; i < stream->outcnt; i++)
414 SCTP_SO(stream, i)->state = SCTP_STREAM_OPEN;
415
416 return retval;
417 }
418
419 asoc->strreset_outstanding = 1;
420
421 return 0;
422}
423
424int sctp_send_add_streams(struct sctp_association *asoc,
425 struct sctp_add_streams *params)
426{
427 struct sctp_stream *stream = &asoc->stream;
428 struct sctp_chunk *chunk = NULL;
429 int retval;
430 __u32 outcnt, incnt;
431 __u16 out, in;
432
433 if (!asoc->peer.reconf_capable ||
434 !(asoc->strreset_enable & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
435 retval = -ENOPROTOOPT;
436 goto out;
437 }
438
439 if (asoc->strreset_outstanding) {
440 retval = -EINPROGRESS;
441 goto out;
442 }
443
444 out = params->sas_outstrms;
445 in = params->sas_instrms;
446 outcnt = stream->outcnt + out;
447 incnt = stream->incnt + in;
448 if (outcnt > SCTP_MAX_STREAM || incnt > SCTP_MAX_STREAM ||
449 (!out && !in)) {
450 retval = -EINVAL;
451 goto out;
452 }
453
454 if (out) {
455 retval = sctp_stream_alloc_out(stream, outcnt, GFP_KERNEL);
456 if (retval)
457 goto out;
458 }
459
460 chunk = sctp_make_strreset_addstrm(asoc, out, in);
461 if (!chunk) {
462 retval = -ENOMEM;
463 goto out;
464 }
465
466 asoc->strreset_chunk = chunk;
467 sctp_chunk_hold(asoc->strreset_chunk);
468
469 retval = sctp_send_reconf(asoc, chunk);
470 if (retval) {
471 sctp_chunk_put(asoc->strreset_chunk);
472 asoc->strreset_chunk = NULL;
473 goto out;
474 }
475
476 asoc->strreset_outstanding = !!out + !!in;
477
478out:
479 return retval;
480}
481
482static struct sctp_paramhdr *sctp_chunk_lookup_strreset_param(
483 struct sctp_association *asoc, __be32 resp_seq,
484 __be16 type)
485{
486 struct sctp_chunk *chunk = asoc->strreset_chunk;
487 struct sctp_reconf_chunk *hdr;
488 union sctp_params param;
489
490 if (!chunk)
491 return NULL;
492
493 hdr = (struct sctp_reconf_chunk *)chunk->chunk_hdr;
494 sctp_walk_params(param, hdr, params) {
495 /* sctp_strreset_tsnreq is actually the basic structure
496 * of all stream reconf params, so it's safe to use it
497 * to access request_seq.
498 */
499 struct sctp_strreset_tsnreq *req = param.v;
500
501 if ((!resp_seq || req->request_seq == resp_seq) &&
502 (!type || type == req->param_hdr.type))
503 return param.v;
504 }
505
506 return NULL;
507}
508
509static void sctp_update_strreset_result(struct sctp_association *asoc,
510 __u32 result)
511{
512 asoc->strreset_result[1] = asoc->strreset_result[0];
513 asoc->strreset_result[0] = result;
514}
515
516struct sctp_chunk *sctp_process_strreset_outreq(
517 struct sctp_association *asoc,
518 union sctp_params param,
519 struct sctp_ulpevent **evp)
520{
521 struct sctp_strreset_outreq *outreq = param.v;
522 struct sctp_stream *stream = &asoc->stream;
523 __u32 result = SCTP_STRRESET_DENIED;
524 __be16 *str_p = NULL;
525 __u32 request_seq;
526 __u16 i, nums;
527
528 request_seq = ntohl(outreq->request_seq);
529
530 if (ntohl(outreq->send_reset_at_tsn) >
531 sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map)) {
532 result = SCTP_STRRESET_IN_PROGRESS;
533 goto err;
534 }
535
536 if (TSN_lt(asoc->strreset_inseq, request_seq) ||
537 TSN_lt(request_seq, asoc->strreset_inseq - 2)) {
538 result = SCTP_STRRESET_ERR_BAD_SEQNO;
539 goto err;
540 } else if (TSN_lt(request_seq, asoc->strreset_inseq)) {
541 i = asoc->strreset_inseq - request_seq - 1;
542 result = asoc->strreset_result[i];
543 goto err;
544 }
545 asoc->strreset_inseq++;
546
547 /* Check strreset_enable after inseq inc, as sender cannot tell
548 * the peer doesn't enable strreset after receiving response with
549 * result denied, as well as to keep consistent with bsd.
550 */
551 if (!(asoc->strreset_enable & SCTP_ENABLE_RESET_STREAM_REQ))
552 goto out;
553
554 nums = (ntohs(param.p->length) - sizeof(*outreq)) / sizeof(__u16);
555 str_p = outreq->list_of_streams;
556 for (i = 0; i < nums; i++) {
557 if (ntohs(str_p[i]) >= stream->incnt) {
558 result = SCTP_STRRESET_ERR_WRONG_SSN;
559 goto out;
560 }
561 }
562
563 if (asoc->strreset_chunk) {
564 if (!sctp_chunk_lookup_strreset_param(
565 asoc, outreq->response_seq,
566 SCTP_PARAM_RESET_IN_REQUEST)) {
567 /* same process with outstanding isn't 0 */
568 result = SCTP_STRRESET_ERR_IN_PROGRESS;
569 goto out;
570 }
571
572 asoc->strreset_outstanding--;
573 asoc->strreset_outseq++;
574
575 if (!asoc->strreset_outstanding) {
576 struct sctp_transport *t;
577
578 t = asoc->strreset_chunk->transport;
579 if (del_timer(&t->reconf_timer))
580 sctp_transport_put(t);
581
582 sctp_chunk_put(asoc->strreset_chunk);
583 asoc->strreset_chunk = NULL;
584 }
585 }
586
587 if (nums)
588 for (i = 0; i < nums; i++)
589 SCTP_SI(stream, ntohs(str_p[i]))->mid = 0;
590 else
591 for (i = 0; i < stream->incnt; i++)
592 SCTP_SI(stream, i)->mid = 0;
593
594 result = SCTP_STRRESET_PERFORMED;
595
596 *evp = sctp_ulpevent_make_stream_reset_event(asoc,
597 SCTP_STREAM_RESET_INCOMING_SSN, nums, str_p, GFP_ATOMIC);
598
599out:
600 sctp_update_strreset_result(asoc, result);
601err:
602 return sctp_make_strreset_resp(asoc, result, request_seq);
603}
604
605struct sctp_chunk *sctp_process_strreset_inreq(
606 struct sctp_association *asoc,
607 union sctp_params param,
608 struct sctp_ulpevent **evp)
609{
610 struct sctp_strreset_inreq *inreq = param.v;
611 struct sctp_stream *stream = &asoc->stream;
612 __u32 result = SCTP_STRRESET_DENIED;
613 struct sctp_chunk *chunk = NULL;
614 __u32 request_seq;
615 __u16 i, nums;
616 __be16 *str_p;
617
618 request_seq = ntohl(inreq->request_seq);
619 if (TSN_lt(asoc->strreset_inseq, request_seq) ||
620 TSN_lt(request_seq, asoc->strreset_inseq - 2)) {
621 result = SCTP_STRRESET_ERR_BAD_SEQNO;
622 goto err;
623 } else if (TSN_lt(request_seq, asoc->strreset_inseq)) {
624 i = asoc->strreset_inseq - request_seq - 1;
625 result = asoc->strreset_result[i];
626 if (result == SCTP_STRRESET_PERFORMED)
627 return NULL;
628 goto err;
629 }
630 asoc->strreset_inseq++;
631
632 if (!(asoc->strreset_enable & SCTP_ENABLE_RESET_STREAM_REQ))
633 goto out;
634
635 if (asoc->strreset_outstanding) {
636 result = SCTP_STRRESET_ERR_IN_PROGRESS;
637 goto out;
638 }
639
640 nums = (ntohs(param.p->length) - sizeof(*inreq)) / sizeof(__u16);
641 str_p = inreq->list_of_streams;
642 for (i = 0; i < nums; i++) {
643 if (ntohs(str_p[i]) >= stream->outcnt) {
644 result = SCTP_STRRESET_ERR_WRONG_SSN;
645 goto out;
646 }
647 }
648
649 if (!sctp_stream_outq_is_empty(stream, nums, str_p)) {
650 result = SCTP_STRRESET_IN_PROGRESS;
651 asoc->strreset_inseq--;
652 goto err;
653 }
654
655 chunk = sctp_make_strreset_req(asoc, nums, str_p, 1, 0);
656 if (!chunk)
657 goto out;
658
659 if (nums)
660 for (i = 0; i < nums; i++)
661 SCTP_SO(stream, ntohs(str_p[i]))->state =
662 SCTP_STREAM_CLOSED;
663 else
664 for (i = 0; i < stream->outcnt; i++)
665 SCTP_SO(stream, i)->state = SCTP_STREAM_CLOSED;
666
667 asoc->strreset_chunk = chunk;
668 asoc->strreset_outstanding = 1;
669 sctp_chunk_hold(asoc->strreset_chunk);
670
671 result = SCTP_STRRESET_PERFORMED;
672
673out:
674 sctp_update_strreset_result(asoc, result);
675err:
676 if (!chunk)
677 chunk = sctp_make_strreset_resp(asoc, result, request_seq);
678
679 return chunk;
680}
681
682struct sctp_chunk *sctp_process_strreset_tsnreq(
683 struct sctp_association *asoc,
684 union sctp_params param,
685 struct sctp_ulpevent **evp)
686{
687 __u32 init_tsn = 0, next_tsn = 0, max_tsn_seen;
688 struct sctp_strreset_tsnreq *tsnreq = param.v;
689 struct sctp_stream *stream = &asoc->stream;
690 __u32 result = SCTP_STRRESET_DENIED;
691 __u32 request_seq;
692 __u16 i;
693
694 request_seq = ntohl(tsnreq->request_seq);
695 if (TSN_lt(asoc->strreset_inseq, request_seq) ||
696 TSN_lt(request_seq, asoc->strreset_inseq - 2)) {
697 result = SCTP_STRRESET_ERR_BAD_SEQNO;
698 goto err;
699 } else if (TSN_lt(request_seq, asoc->strreset_inseq)) {
700 i = asoc->strreset_inseq - request_seq - 1;
701 result = asoc->strreset_result[i];
702 if (result == SCTP_STRRESET_PERFORMED) {
703 next_tsn = asoc->ctsn_ack_point + 1;
704 init_tsn =
705 sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map) + 1;
706 }
707 goto err;
708 }
709
710 if (!sctp_outq_is_empty(&asoc->outqueue)) {
711 result = SCTP_STRRESET_IN_PROGRESS;
712 goto err;
713 }
714
715 asoc->strreset_inseq++;
716
717 if (!(asoc->strreset_enable & SCTP_ENABLE_RESET_ASSOC_REQ))
718 goto out;
719
720 if (asoc->strreset_outstanding) {
721 result = SCTP_STRRESET_ERR_IN_PROGRESS;
722 goto out;
723 }
724
725 /* G4: The same processing as though a FWD-TSN chunk (as defined in
726 * [RFC3758]) with all streams affected and a new cumulative TSN
727 * ACK of the Receiver's Next TSN minus 1 were received MUST be
728 * performed.
729 */
730 max_tsn_seen = sctp_tsnmap_get_max_tsn_seen(&asoc->peer.tsn_map);
731 asoc->stream.si->report_ftsn(&asoc->ulpq, max_tsn_seen);
732
733 /* G1: Compute an appropriate value for the Receiver's Next TSN -- the
734 * TSN that the peer should use to send the next DATA chunk. The
735 * value SHOULD be the smallest TSN not acknowledged by the
736 * receiver of the request plus 2^31.
737 */
738 init_tsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map) + (1 << 31);
739 sctp_tsnmap_init(&asoc->peer.tsn_map, SCTP_TSN_MAP_INITIAL,
740 init_tsn, GFP_ATOMIC);
741
742 /* G3: The same processing as though a SACK chunk with no gap report
743 * and a cumulative TSN ACK of the Sender's Next TSN minus 1 were
744 * received MUST be performed.
745 */
746 sctp_outq_free(&asoc->outqueue);
747
748 /* G2: Compute an appropriate value for the local endpoint's next TSN,
749 * i.e., the next TSN assigned by the receiver of the SSN/TSN reset
750 * chunk. The value SHOULD be the highest TSN sent by the receiver
751 * of the request plus 1.
752 */
753 next_tsn = asoc->next_tsn;
754 asoc->ctsn_ack_point = next_tsn - 1;
755 asoc->adv_peer_ack_point = asoc->ctsn_ack_point;
756
757 /* G5: The next expected and outgoing SSNs MUST be reset to 0 for all
758 * incoming and outgoing streams.
759 */
760 for (i = 0; i < stream->outcnt; i++) {
761 SCTP_SO(stream, i)->mid = 0;
762 SCTP_SO(stream, i)->mid_uo = 0;
763 }
764 for (i = 0; i < stream->incnt; i++)
765 SCTP_SI(stream, i)->mid = 0;
766
767 result = SCTP_STRRESET_PERFORMED;
768
769 *evp = sctp_ulpevent_make_assoc_reset_event(asoc, 0, init_tsn,
770 next_tsn, GFP_ATOMIC);
771
772out:
773 sctp_update_strreset_result(asoc, result);
774err:
775 return sctp_make_strreset_tsnresp(asoc, result, request_seq,
776 next_tsn, init_tsn);
777}
778
779struct sctp_chunk *sctp_process_strreset_addstrm_out(
780 struct sctp_association *asoc,
781 union sctp_params param,
782 struct sctp_ulpevent **evp)
783{
784 struct sctp_strreset_addstrm *addstrm = param.v;
785 struct sctp_stream *stream = &asoc->stream;
786 __u32 result = SCTP_STRRESET_DENIED;
787 __u32 request_seq, incnt;
788 __u16 in, i;
789
790 request_seq = ntohl(addstrm->request_seq);
791 if (TSN_lt(asoc->strreset_inseq, request_seq) ||
792 TSN_lt(request_seq, asoc->strreset_inseq - 2)) {
793 result = SCTP_STRRESET_ERR_BAD_SEQNO;
794 goto err;
795 } else if (TSN_lt(request_seq, asoc->strreset_inseq)) {
796 i = asoc->strreset_inseq - request_seq - 1;
797 result = asoc->strreset_result[i];
798 goto err;
799 }
800 asoc->strreset_inseq++;
801
802 if (!(asoc->strreset_enable & SCTP_ENABLE_CHANGE_ASSOC_REQ))
803 goto out;
804
805 in = ntohs(addstrm->number_of_streams);
806 incnt = stream->incnt + in;
807 if (!in || incnt > SCTP_MAX_STREAM)
808 goto out;
809
810 if (sctp_stream_alloc_in(stream, incnt, GFP_ATOMIC))
811 goto out;
812
813 if (asoc->strreset_chunk) {
814 if (!sctp_chunk_lookup_strreset_param(
815 asoc, 0, SCTP_PARAM_RESET_ADD_IN_STREAMS)) {
816 /* same process with outstanding isn't 0 */
817 result = SCTP_STRRESET_ERR_IN_PROGRESS;
818 goto out;
819 }
820
821 asoc->strreset_outstanding--;
822 asoc->strreset_outseq++;
823
824 if (!asoc->strreset_outstanding) {
825 struct sctp_transport *t;
826
827 t = asoc->strreset_chunk->transport;
828 if (del_timer(&t->reconf_timer))
829 sctp_transport_put(t);
830
831 sctp_chunk_put(asoc->strreset_chunk);
832 asoc->strreset_chunk = NULL;
833 }
834 }
835
836 stream->incnt = incnt;
837
838 result = SCTP_STRRESET_PERFORMED;
839
840 *evp = sctp_ulpevent_make_stream_change_event(asoc,
841 0, ntohs(addstrm->number_of_streams), 0, GFP_ATOMIC);
842
843out:
844 sctp_update_strreset_result(asoc, result);
845err:
846 return sctp_make_strreset_resp(asoc, result, request_seq);
847}
848
849struct sctp_chunk *sctp_process_strreset_addstrm_in(
850 struct sctp_association *asoc,
851 union sctp_params param,
852 struct sctp_ulpevent **evp)
853{
854 struct sctp_strreset_addstrm *addstrm = param.v;
855 struct sctp_stream *stream = &asoc->stream;
856 __u32 result = SCTP_STRRESET_DENIED;
857 struct sctp_chunk *chunk = NULL;
858 __u32 request_seq, outcnt;
859 __u16 out, i;
860 int ret;
861
862 request_seq = ntohl(addstrm->request_seq);
863 if (TSN_lt(asoc->strreset_inseq, request_seq) ||
864 TSN_lt(request_seq, asoc->strreset_inseq - 2)) {
865 result = SCTP_STRRESET_ERR_BAD_SEQNO;
866 goto err;
867 } else if (TSN_lt(request_seq, asoc->strreset_inseq)) {
868 i = asoc->strreset_inseq - request_seq - 1;
869 result = asoc->strreset_result[i];
870 if (result == SCTP_STRRESET_PERFORMED)
871 return NULL;
872 goto err;
873 }
874 asoc->strreset_inseq++;
875
876 if (!(asoc->strreset_enable & SCTP_ENABLE_CHANGE_ASSOC_REQ))
877 goto out;
878
879 if (asoc->strreset_outstanding) {
880 result = SCTP_STRRESET_ERR_IN_PROGRESS;
881 goto out;
882 }
883
884 out = ntohs(addstrm->number_of_streams);
885 outcnt = stream->outcnt + out;
886 if (!out || outcnt > SCTP_MAX_STREAM)
887 goto out;
888
889 ret = sctp_stream_alloc_out(stream, outcnt, GFP_ATOMIC);
890 if (ret)
891 goto out;
892
893 chunk = sctp_make_strreset_addstrm(asoc, out, 0);
894 if (!chunk)
895 goto out;
896
897 asoc->strreset_chunk = chunk;
898 asoc->strreset_outstanding = 1;
899 sctp_chunk_hold(asoc->strreset_chunk);
900
901 stream->outcnt = outcnt;
902
903 result = SCTP_STRRESET_PERFORMED;
904
905out:
906 sctp_update_strreset_result(asoc, result);
907err:
908 if (!chunk)
909 chunk = sctp_make_strreset_resp(asoc, result, request_seq);
910
911 return chunk;
912}
913
914struct sctp_chunk *sctp_process_strreset_resp(
915 struct sctp_association *asoc,
916 union sctp_params param,
917 struct sctp_ulpevent **evp)
918{
919 struct sctp_stream *stream = &asoc->stream;
920 struct sctp_strreset_resp *resp = param.v;
921 struct sctp_transport *t;
922 __u16 i, nums, flags = 0;
923 struct sctp_paramhdr *req;
924 __u32 result;
925
926 req = sctp_chunk_lookup_strreset_param(asoc, resp->response_seq, 0);
927 if (!req)
928 return NULL;
929
930 result = ntohl(resp->result);
931 if (result != SCTP_STRRESET_PERFORMED) {
932 /* if in progress, do nothing but retransmit */
933 if (result == SCTP_STRRESET_IN_PROGRESS)
934 return NULL;
935 else if (result == SCTP_STRRESET_DENIED)
936 flags = SCTP_STREAM_RESET_DENIED;
937 else
938 flags = SCTP_STREAM_RESET_FAILED;
939 }
940
941 if (req->type == SCTP_PARAM_RESET_OUT_REQUEST) {
942 struct sctp_strreset_outreq *outreq;
943 __be16 *str_p;
944
945 outreq = (struct sctp_strreset_outreq *)req;
946 str_p = outreq->list_of_streams;
947 nums = (ntohs(outreq->param_hdr.length) - sizeof(*outreq)) /
948 sizeof(__u16);
949
950 if (result == SCTP_STRRESET_PERFORMED) {
951 struct sctp_stream_out *sout;
952 if (nums) {
953 for (i = 0; i < nums; i++) {
954 sout = SCTP_SO(stream, ntohs(str_p[i]));
955 sout->mid = 0;
956 sout->mid_uo = 0;
957 }
958 } else {
959 for (i = 0; i < stream->outcnt; i++) {
960 sout = SCTP_SO(stream, i);
961 sout->mid = 0;
962 sout->mid_uo = 0;
963 }
964 }
965 }
966
967 flags |= SCTP_STREAM_RESET_OUTGOING_SSN;
968
969 for (i = 0; i < stream->outcnt; i++)
970 SCTP_SO(stream, i)->state = SCTP_STREAM_OPEN;
971
972 *evp = sctp_ulpevent_make_stream_reset_event(asoc, flags,
973 nums, str_p, GFP_ATOMIC);
974 } else if (req->type == SCTP_PARAM_RESET_IN_REQUEST) {
975 struct sctp_strreset_inreq *inreq;
976 __be16 *str_p;
977
978 /* if the result is performed, it's impossible for inreq */
979 if (result == SCTP_STRRESET_PERFORMED)
980 return NULL;
981
982 inreq = (struct sctp_strreset_inreq *)req;
983 str_p = inreq->list_of_streams;
984 nums = (ntohs(inreq->param_hdr.length) - sizeof(*inreq)) /
985 sizeof(__u16);
986
987 flags |= SCTP_STREAM_RESET_INCOMING_SSN;
988
989 *evp = sctp_ulpevent_make_stream_reset_event(asoc, flags,
990 nums, str_p, GFP_ATOMIC);
991 } else if (req->type == SCTP_PARAM_RESET_TSN_REQUEST) {
992 struct sctp_strreset_resptsn *resptsn;
993 __u32 stsn, rtsn;
994
995 /* check for resptsn, as sctp_verify_reconf didn't do it*/
996 if (ntohs(param.p->length) != sizeof(*resptsn))
997 return NULL;
998
999 resptsn = (struct sctp_strreset_resptsn *)resp;
1000 stsn = ntohl(resptsn->senders_next_tsn);
1001 rtsn = ntohl(resptsn->receivers_next_tsn);
1002
1003 if (result == SCTP_STRRESET_PERFORMED) {
1004 __u32 mtsn = sctp_tsnmap_get_max_tsn_seen(
1005 &asoc->peer.tsn_map);
1006 LIST_HEAD(temp);
1007
1008 asoc->stream.si->report_ftsn(&asoc->ulpq, mtsn);
1009
1010 sctp_tsnmap_init(&asoc->peer.tsn_map,
1011 SCTP_TSN_MAP_INITIAL,
1012 stsn, GFP_ATOMIC);
1013
1014 /* Clean up sacked and abandoned queues only. As the
1015 * out_chunk_list may not be empty, splice it to temp,
1016 * then get it back after sctp_outq_free is done.
1017 */
1018 list_splice_init(&asoc->outqueue.out_chunk_list, &temp);
1019 sctp_outq_free(&asoc->outqueue);
1020 list_splice_init(&temp, &asoc->outqueue.out_chunk_list);
1021
1022 asoc->next_tsn = rtsn;
1023 asoc->ctsn_ack_point = asoc->next_tsn - 1;
1024 asoc->adv_peer_ack_point = asoc->ctsn_ack_point;
1025
1026 for (i = 0; i < stream->outcnt; i++) {
1027 SCTP_SO(stream, i)->mid = 0;
1028 SCTP_SO(stream, i)->mid_uo = 0;
1029 }
1030 for (i = 0; i < stream->incnt; i++)
1031 SCTP_SI(stream, i)->mid = 0;
1032 }
1033
1034 for (i = 0; i < stream->outcnt; i++)
1035 SCTP_SO(stream, i)->state = SCTP_STREAM_OPEN;
1036
1037 *evp = sctp_ulpevent_make_assoc_reset_event(asoc, flags,
1038 stsn, rtsn, GFP_ATOMIC);
1039 } else if (req->type == SCTP_PARAM_RESET_ADD_OUT_STREAMS) {
1040 struct sctp_strreset_addstrm *addstrm;
1041 __u16 number;
1042
1043 addstrm = (struct sctp_strreset_addstrm *)req;
1044 nums = ntohs(addstrm->number_of_streams);
1045 number = stream->outcnt - nums;
1046
1047 if (result == SCTP_STRRESET_PERFORMED) {
1048 for (i = number; i < stream->outcnt; i++)
1049 SCTP_SO(stream, i)->state = SCTP_STREAM_OPEN;
1050 } else {
1051 sctp_stream_shrink_out(stream, number);
1052 stream->outcnt = number;
1053 }
1054
1055 *evp = sctp_ulpevent_make_stream_change_event(asoc, flags,
1056 0, nums, GFP_ATOMIC);
1057 } else if (req->type == SCTP_PARAM_RESET_ADD_IN_STREAMS) {
1058 struct sctp_strreset_addstrm *addstrm;
1059
1060 /* if the result is performed, it's impossible for addstrm in
1061 * request.
1062 */
1063 if (result == SCTP_STRRESET_PERFORMED)
1064 return NULL;
1065
1066 addstrm = (struct sctp_strreset_addstrm *)req;
1067 nums = ntohs(addstrm->number_of_streams);
1068
1069 *evp = sctp_ulpevent_make_stream_change_event(asoc, flags,
1070 nums, 0, GFP_ATOMIC);
1071 }
1072
1073 asoc->strreset_outstanding--;
1074 asoc->strreset_outseq++;
1075
1076 /* remove everything for this reconf request */
1077 if (!asoc->strreset_outstanding) {
1078 t = asoc->strreset_chunk->transport;
1079 if (del_timer(&t->reconf_timer))
1080 sctp_transport_put(t);
1081
1082 sctp_chunk_put(asoc->strreset_chunk);
1083 asoc->strreset_chunk = NULL;
1084 }
1085
1086 return NULL;
1087}