net/sctp/stream.c

   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 static 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
  55 /* Migrates chunks from stream queues to new stream queues if needed,
  56  * but not across associations. Also, removes those chunks to streams
  57  * higher than the new max.
  58  */
  59 static void sctp_stream_outq_migrate(struct sctp_stream *stream,
  60                                      struct sctp_stream *new, __u16 outcnt)
  61 {
  62         int i;
  63
  64         if (stream->outcnt > outcnt)
  65                 sctp_stream_shrink_out(stream, outcnt);
  66
  67         if (new) {
  68                 /* Here we actually move the old ext stuff into the new
  69                  * buffer, because we want to keep it. Then
  70                  * sctp_stream_update will swap ->out pointers.
  71                  */
  72                 for (i = 0; i < outcnt; i++) {
  73                         kfree(SCTP_SO(new, i)->ext);
  74                         SCTP_SO(new, i)->ext = SCTP_SO(stream, i)->ext;
  75                         SCTP_SO(stream, i)->ext = NULL;
  76                 }
  77         }
  78
  79         for (i = outcnt; i < stream->outcnt; i++) {
  80                 kfree(SCTP_SO(stream, i)->ext);
  81                 SCTP_SO(stream, i)->ext = NULL;
  82         }
  83 }
  84
  85 static int sctp_stream_alloc_out(struct sctp_stream *stream, __u16 outcnt,
  86                                  gfp_t gfp)
  87 {
  88         int ret;
  89
  90         if (outcnt <= stream->outcnt)
  91                 goto out;
  92
  93         ret = genradix_prealloc(&stream->out, outcnt, gfp);
  94         if (ret)
  95                 return ret;
  96
  97 out:
  98         stream->outcnt = outcnt;
  99         return 0;
 100 }
 101
 102 static int sctp_stream_alloc_in(struct sctp_stream *stream, __u16 incnt,
 103                                 gfp_t gfp)
 104 {
 105         int ret;
 106
 107         if (incnt <= stream->incnt)
 108                 goto out;
 109
 110         ret = genradix_prealloc(&stream->in, incnt, gfp);
 111         if (ret)
 112                 return ret;
 113
 114 out:
 115         stream->incnt = incnt;
 116         return 0;
 117 }
 118
 119 int sctp_stream_init(struct sctp_stream *stream, __u16 outcnt, __u16 incnt,
 120                      gfp_t gfp)
 121 {
 122         struct sctp_sched_ops *sched = sctp_sched_ops_from_stream(stream);
 123         int i, ret = 0;
 124
 125         gfp |= __GFP_NOWARN;
 126
 127         /* Initial stream->out size may be very big, so free it and alloc
 128          * a new one with new outcnt to save memory if needed.
 129          */
 130         if (outcnt == stream->outcnt)
 131                 goto handle_in;
 132
 133         /* Filter out chunks queued on streams that won't exist anymore */
 134         sched->unsched_all(stream);
 135         sctp_stream_outq_migrate(stream, NULL, outcnt);
 136         sched->sched_all(stream);
 137
 138         ret = sctp_stream_alloc_out(stream, outcnt, gfp);
 139         if (ret)
 140                 goto out_err;
 141
 142         for (i = 0; i < stream->outcnt; i++)
 143                 SCTP_SO(stream, i)->state = SCTP_STREAM_OPEN;
 144
 145 handle_in:
 146         sctp_stream_interleave_init(stream);
 147         if (!incnt)
 148                 goto out;
 149
 150         ret = sctp_stream_alloc_in(stream, incnt, gfp);
 151         if (ret)
 152                 goto in_err;
 153
 154         goto out;
 155
 156 in_err:
 157         sched->free(stream);
 158         genradix_free(&stream->in);
 159 out_err:
 160         genradix_free(&stream->out);
 161         stream->outcnt = 0;
 162 out:
 163         return ret;
 164 }
 165
 166 int sctp_stream_init_ext(struct sctp_stream *stream, __u16 sid)
 167 {
 168         struct sctp_stream_out_ext *soute;
 169         int ret;
 170
 171         soute = kzalloc(sizeof(*soute), GFP_KERNEL);
 172         if (!soute)
 173                 return -ENOMEM;
 174         SCTP_SO(stream, sid)->ext = soute;
 175
 176         ret = sctp_sched_init_sid(stream, sid, GFP_KERNEL);
 177         if (ret) {
 178                 kfree(SCTP_SO(stream, sid)->ext);
 179                 SCTP_SO(stream, sid)->ext = NULL;
 180         }
 181
 182         return ret;
 183 }
 184
 185 void sctp_stream_free(struct sctp_stream *stream)
 186 {
 187         struct sctp_sched_ops *sched = sctp_sched_ops_from_stream(stream);
 188         int i;
 189
 190         sched->free(stream);
 191         for (i = 0; i < stream->outcnt; i++)
 192                 kfree(SCTP_SO(stream, i)->ext);
 193         genradix_free(&stream->out);
 194         genradix_free(&stream->in);
 195 }
 196
 197 void sctp_stream_clear(struct sctp_stream *stream)
 198 {
 199         int i;
 200
 201         for (i = 0; i < stream->outcnt; i++) {
 202                 SCTP_SO(stream, i)->mid = 0;
 203                 SCTP_SO(stream, i)->mid_uo = 0;
 204         }
 205
 206         for (i = 0; i < stream->incnt; i++)
 207                 SCTP_SI(stream, i)->mid = 0;
 208 }
 209
 210 void sctp_stream_update(struct sctp_stream *stream, struct sctp_stream *new)
 211 {
 212         struct sctp_sched_ops *sched = sctp_sched_ops_from_stream(stream);
 213
 214         sched->unsched_all(stream);
 215         sctp_stream_outq_migrate(stream, new, new->outcnt);
 216         sctp_stream_free(stream);
 217
 218         stream->out = new->out;
 219         stream->in  = new->in;
 220         stream->outcnt = new->outcnt;
 221         stream->incnt  = new->incnt;
 222
 223         sched->sched_all(stream);
 224
 225         new->out.tree.root = NULL;
 226         new->in.tree.root  = NULL;
 227         new->outcnt = 0;
 228         new->incnt  = 0;
 229 }
 230
 231 static int sctp_send_reconf(struct sctp_association *asoc,
 232                             struct sctp_chunk *chunk)
 233 {
 234         int retval = 0;
 235
 236         retval = sctp_primitive_RECONF(asoc->base.net, asoc, chunk);
 237         if (retval)
 238                 sctp_chunk_free(chunk);
 239
 240         return retval;
 241 }
 242
 243 static bool sctp_stream_outq_is_empty(struct sctp_stream *stream,
 244                                       __u16 str_nums, __be16 *str_list)
 245 {
 246         struct sctp_association *asoc;
 247         __u16 i;
 248
 249         asoc = container_of(stream, struct sctp_association, stream);
 250         if (!asoc->outqueue.out_qlen)
 251                 return true;
 252
 253         if (!str_nums)
 254                 return false;
 255
 256         for (i = 0; i < str_nums; i++) {
 257                 __u16 sid = ntohs(str_list[i]);
 258
 259                 if (SCTP_SO(stream, sid)->ext &&
 260                     !list_empty(&SCTP_SO(stream, sid)->ext->outq))
 261                         return false;
 262         }
 263
 264         return true;
 265 }
 266
 267 int sctp_send_reset_streams(struct sctp_association *asoc,
 268                             struct sctp_reset_streams *params)
 269 {
 270         struct sctp_stream *stream = &asoc->stream;
 271         __u16 i, str_nums, *str_list;
 272         struct sctp_chunk *chunk;
 273         int retval = -EINVAL;
 274         __be16 *nstr_list;
 275         bool out, in;
 276
 277         if (!asoc->peer.reconf_capable ||
 278             !(asoc->strreset_enable & SCTP_ENABLE_RESET_STREAM_REQ)) {
 279                 retval = -ENOPROTOOPT;
 280                 goto out;
 281         }
 282
 283         if (asoc->strreset_outstanding) {
 284                 retval = -EINPROGRESS;
 285                 goto out;
 286         }
 287
 288         out = params->srs_flags & SCTP_STREAM_RESET_OUTGOING;
 289         in  = params->srs_flags & SCTP_STREAM_RESET_INCOMING;
 290         if (!out && !in)
 291                 goto out;
 292
 293         str_nums = params->srs_number_streams;
 294         str_list = params->srs_stream_list;
 295         if (str_nums) {
 296                 int param_len = 0;
 297
 298                 if (out) {
 299                         for (i = 0; i < str_nums; i++)
 300                                 if (str_list[i] >= stream->outcnt)
 301                                         goto out;
 302
 303                         param_len = str_nums * sizeof(__u16) +
 304                                     sizeof(struct sctp_strreset_outreq);
 305                 }
 306
 307                 if (in) {
 308                         for (i = 0; i < str_nums; i++)
 309                                 if (str_list[i] >= stream->incnt)
 310                                         goto out;
 311
 312                         param_len += str_nums * sizeof(__u16) +
 313                                      sizeof(struct sctp_strreset_inreq);
 314                 }
 315
 316                 if (param_len > SCTP_MAX_CHUNK_LEN -
 317                                 sizeof(struct sctp_reconf_chunk))
 318                         goto out;
 319         }
 320
 321         nstr_list = kcalloc(str_nums, sizeof(__be16), GFP_KERNEL);
 322         if (!nstr_list) {
 323                 retval = -ENOMEM;
 324                 goto out;
 325         }
 326
 327         for (i = 0; i < str_nums; i++)
 328                 nstr_list[i] = htons(str_list[i]);
 329
 330         if (out && !sctp_stream_outq_is_empty(stream, str_nums, nstr_list)) {
 331                 kfree(nstr_list);
 332                 retval = -EAGAIN;
 333                 goto out;
 334         }
 335
 336         chunk = sctp_make_strreset_req(asoc, str_nums, nstr_list, out, in);
 337
 338         kfree(nstr_list);
 339
 340         if (!chunk) {
 341                 retval = -ENOMEM;
 342                 goto out;
 343         }
 344
 345         if (out) {
 346                 if (str_nums)
 347                         for (i = 0; i < str_nums; i++)
 348                                 SCTP_SO(stream, str_list[i])->state =
 349                                                        SCTP_STREAM_CLOSED;
 350                 else
 351                         for (i = 0; i < stream->outcnt; i++)
 352                                 SCTP_SO(stream, i)->state = SCTP_STREAM_CLOSED;
 353         }
 354
 355         asoc->strreset_chunk = chunk;
 356         sctp_chunk_hold(asoc->strreset_chunk);
 357
 358         retval = sctp_send_reconf(asoc, chunk);
 359         if (retval) {
 360                 sctp_chunk_put(asoc->strreset_chunk);
 361                 asoc->strreset_chunk = NULL;
 362                 if (!out)
 363                         goto out;
 364
 365                 if (str_nums)
 366                         for (i = 0; i < str_nums; i++)
 367                                 SCTP_SO(stream, str_list[i])->state =
 368                                                        SCTP_STREAM_OPEN;
 369                 else
 370                         for (i = 0; i < stream->outcnt; i++)
 371                                 SCTP_SO(stream, i)->state = SCTP_STREAM_OPEN;
 372
 373                 goto out;
 374         }
 375
 376         asoc->strreset_outstanding = out + in;
 377
 378 out:
 379         return retval;
 380 }
 381
 382 int sctp_send_reset_assoc(struct sctp_association *asoc)
 383 {
 384         struct sctp_stream *stream = &asoc->stream;
 385         struct sctp_chunk *chunk = NULL;
 386         int retval;
 387         __u16 i;
 388
 389         if (!asoc->peer.reconf_capable ||
 390             !(asoc->strreset_enable & SCTP_ENABLE_RESET_ASSOC_REQ))
 391                 return -ENOPROTOOPT;
 392
 393         if (asoc->strreset_outstanding)
 394                 return -EINPROGRESS;
 395
 396         if (!sctp_outq_is_empty(&asoc->outqueue))
 397                 return -EAGAIN;
 398
 399         chunk = sctp_make_strreset_tsnreq(asoc);
 400         if (!chunk)
 401                 return -ENOMEM;
 402
 403         /* Block further xmit of data until this request is completed */
 404         for (i = 0; i < stream->outcnt; i++)
 405                 SCTP_SO(stream, i)->state = SCTP_STREAM_CLOSED;
 406
 407         asoc->strreset_chunk = chunk;
 408         sctp_chunk_hold(asoc->strreset_chunk);
 409
 410         retval = sctp_send_reconf(asoc, chunk);
 411         if (retval) {
 412                 sctp_chunk_put(asoc->strreset_chunk);
 413                 asoc->strreset_chunk = NULL;
 414
 415                 for (i = 0; i < stream->outcnt; i++)
 416                         SCTP_SO(stream, i)->state = SCTP_STREAM_OPEN;
 417
 418                 return retval;
 419         }
 420
 421         asoc->strreset_outstanding = 1;
 422
 423         return 0;
 424 }
 425
 426 int sctp_send_add_streams(struct sctp_association *asoc,
 427                           struct sctp_add_streams *params)
 428 {
 429         struct sctp_stream *stream = &asoc->stream;
 430         struct sctp_chunk *chunk = NULL;
 431         int retval;
 432         __u32 outcnt, incnt;
 433         __u16 out, in;
 434
 435         if (!asoc->peer.reconf_capable ||
 436             !(asoc->strreset_enable & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
 437                 retval = -ENOPROTOOPT;
 438                 goto out;
 439         }
 440
 441         if (asoc->strreset_outstanding) {
 442                 retval = -EINPROGRESS;
 443                 goto out;
 444         }
 445
 446         out = params->sas_outstrms;
 447         in  = params->sas_instrms;
 448         outcnt = stream->outcnt + out;
 449         incnt = stream->incnt + in;
 450         if (outcnt > SCTP_MAX_STREAM || incnt > SCTP_MAX_STREAM ||
 451             (!out && !in)) {
 452                 retval = -EINVAL;
 453                 goto out;
 454         }
 455
 456         if (out) {
 457                 retval = sctp_stream_alloc_out(stream, outcnt, GFP_KERNEL);
 458                 if (retval)
 459                         goto out;
 460         }
 461
 462         chunk = sctp_make_strreset_addstrm(asoc, out, in);
 463         if (!chunk) {
 464                 retval = -ENOMEM;
 465                 goto out;
 466         }
 467
 468         asoc->strreset_chunk = chunk;
 469         sctp_chunk_hold(asoc->strreset_chunk);
 470
 471         retval = sctp_send_reconf(asoc, chunk);
 472         if (retval) {
 473                 sctp_chunk_put(asoc->strreset_chunk);
 474                 asoc->strreset_chunk = NULL;
 475                 goto out;
 476         }
 477
 478         asoc->strreset_outstanding = !!out + !!in;
 479
 480 out:
 481         return retval;
 482 }
 483
 484 static struct sctp_paramhdr *sctp_chunk_lookup_strreset_param(
 485                         struct sctp_association *asoc, __be32 resp_seq,
 486                         __be16 type)
 487 {
 488         struct sctp_chunk *chunk = asoc->strreset_chunk;
 489         struct sctp_reconf_chunk *hdr;
 490         union sctp_params param;
 491
 492         if (!chunk)
 493                 return NULL;
 494
 495         hdr = (struct sctp_reconf_chunk *)chunk->chunk_hdr;
 496         sctp_walk_params(param, hdr, params) {
 497                 /* sctp_strreset_tsnreq is actually the basic structure
 498                  * of all stream reconf params, so it's safe to use it
 499                  * to access request_seq.
 500                  */
 501                 struct sctp_strreset_tsnreq *req = param.v;
 502
 503                 if ((!resp_seq || req->request_seq == resp_seq) &&
 504                     (!type || type == req->param_hdr.type))
 505                         return param.v;
 506         }
 507
 508         return NULL;
 509 }
 510
 511 static void sctp_update_strreset_result(struct sctp_association *asoc,
 512                                         __u32 result)
 513 {
 514         asoc->strreset_result[1] = asoc->strreset_result[0];
 515         asoc->strreset_result[0] = result;
 516 }
 517
 518 struct sctp_chunk *sctp_process_strreset_outreq(
 519                                 struct sctp_association *asoc,
 520                                 union sctp_params param,
 521                                 struct sctp_ulpevent **evp)
 522 {
 523         struct sctp_strreset_outreq *outreq = param.v;
 524         struct sctp_stream *stream = &asoc->stream;
 525         __u32 result = SCTP_STRRESET_DENIED;
 526         __be16 *str_p = NULL;
 527         __u32 request_seq;
 528         __u16 i, nums;
 529
 530         request_seq = ntohl(outreq->request_seq);
 531
 532         if (ntohl(outreq->send_reset_at_tsn) >
 533             sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map)) {
 534                 result = SCTP_STRRESET_IN_PROGRESS;
 535                 goto err;
 536         }
 537
 538         if (TSN_lt(asoc->strreset_inseq, request_seq) ||
 539             TSN_lt(request_seq, asoc->strreset_inseq - 2)) {
 540                 result = SCTP_STRRESET_ERR_BAD_SEQNO;
 541                 goto err;
 542         } else if (TSN_lt(request_seq, asoc->strreset_inseq)) {
 543                 i = asoc->strreset_inseq - request_seq - 1;
 544                 result = asoc->strreset_result[i];
 545                 goto err;
 546         }
 547         asoc->strreset_inseq++;
 548
 549         /* Check strreset_enable after inseq inc, as sender cannot tell
 550          * the peer doesn't enable strreset after receiving response with
 551          * result denied, as well as to keep consistent with bsd.
 552          */
 553         if (!(asoc->strreset_enable & SCTP_ENABLE_RESET_STREAM_REQ))
 554                 goto out;
 555
 556         nums = (ntohs(param.p->length) - sizeof(*outreq)) / sizeof(__u16);
 557         str_p = outreq->list_of_streams;
 558         for (i = 0; i < nums; i++) {
 559                 if (ntohs(str_p[i]) >= stream->incnt) {
 560                         result = SCTP_STRRESET_ERR_WRONG_SSN;
 561                         goto out;
 562                 }
 563         }
 564
 565         if (asoc->strreset_chunk) {
 566                 if (!sctp_chunk_lookup_strreset_param(
 567                                 asoc, outreq->response_seq,
 568                                 SCTP_PARAM_RESET_IN_REQUEST)) {
 569                         /* same process with outstanding isn't 0 */
 570                         result = SCTP_STRRESET_ERR_IN_PROGRESS;
 571                         goto out;
 572                 }
 573
 574                 asoc->strreset_outstanding--;
 575                 asoc->strreset_outseq++;
 576
 577                 if (!asoc->strreset_outstanding) {
 578                         struct sctp_transport *t;
 579
 580                         t = asoc->strreset_chunk->transport;
 581                         if (del_timer(&t->reconf_timer))
 582                                 sctp_transport_put(t);
 583
 584                         sctp_chunk_put(asoc->strreset_chunk);
 585                         asoc->strreset_chunk = NULL;
 586                 }
 587         }
 588
 589         if (nums)
 590                 for (i = 0; i < nums; i++)
 591                         SCTP_SI(stream, ntohs(str_p[i]))->mid = 0;
 592         else
 593                 for (i = 0; i < stream->incnt; i++)
 594                         SCTP_SI(stream, i)->mid = 0;
 595
 596         result = SCTP_STRRESET_PERFORMED;
 597
 598         *evp = sctp_ulpevent_make_stream_reset_event(asoc,
 599                 SCTP_STREAM_RESET_INCOMING_SSN, nums, str_p, GFP_ATOMIC);
 600
 601 out:
 602         sctp_update_strreset_result(asoc, result);
 603 err:
 604         return sctp_make_strreset_resp(asoc, result, request_seq);
 605 }
 606
 607 struct sctp_chunk *sctp_process_strreset_inreq(
 608                                 struct sctp_association *asoc,
 609                                 union sctp_params param,
 610                                 struct sctp_ulpevent **evp)
 611 {
 612         struct sctp_strreset_inreq *inreq = param.v;
 613         struct sctp_stream *stream = &asoc->stream;
 614         __u32 result = SCTP_STRRESET_DENIED;
 615         struct sctp_chunk *chunk = NULL;
 616         __u32 request_seq;
 617         __u16 i, nums;
 618         __be16 *str_p;
 619
 620         request_seq = ntohl(inreq->request_seq);
 621         if (TSN_lt(asoc->strreset_inseq, request_seq) ||
 622             TSN_lt(request_seq, asoc->strreset_inseq - 2)) {
 623                 result = SCTP_STRRESET_ERR_BAD_SEQNO;
 624                 goto err;
 625         } else if (TSN_lt(request_seq, asoc->strreset_inseq)) {
 626                 i = asoc->strreset_inseq - request_seq - 1;
 627                 result = asoc->strreset_result[i];
 628                 if (result == SCTP_STRRESET_PERFORMED)
 629                         return NULL;
 630                 goto err;
 631         }
 632         asoc->strreset_inseq++;
 633
 634         if (!(asoc->strreset_enable & SCTP_ENABLE_RESET_STREAM_REQ))
 635                 goto out;
 636
 637         if (asoc->strreset_outstanding) {
 638                 result = SCTP_STRRESET_ERR_IN_PROGRESS;
 639                 goto out;
 640         }
 641
 642         nums = (ntohs(param.p->length) - sizeof(*inreq)) / sizeof(__u16);
 643         str_p = inreq->list_of_streams;
 644         for (i = 0; i < nums; i++) {
 645                 if (ntohs(str_p[i]) >= stream->outcnt) {
 646                         result = SCTP_STRRESET_ERR_WRONG_SSN;
 647                         goto out;
 648                 }
 649         }
 650
 651         if (!sctp_stream_outq_is_empty(stream, nums, str_p)) {
 652                 result = SCTP_STRRESET_IN_PROGRESS;
 653                 asoc->strreset_inseq--;
 654                 goto err;
 655         }
 656
 657         chunk = sctp_make_strreset_req(asoc, nums, str_p, 1, 0);
 658         if (!chunk)
 659                 goto out;
 660
 661         if (nums)
 662                 for (i = 0; i < nums; i++)
 663                         SCTP_SO(stream, ntohs(str_p[i]))->state =
 664                                                SCTP_STREAM_CLOSED;
 665         else
 666                 for (i = 0; i < stream->outcnt; i++)
 667                         SCTP_SO(stream, i)->state = SCTP_STREAM_CLOSED;
 668
 669         asoc->strreset_chunk = chunk;
 670         asoc->strreset_outstanding = 1;
 671         sctp_chunk_hold(asoc->strreset_chunk);
 672
 673         result = SCTP_STRRESET_PERFORMED;
 674
 675 out:
 676         sctp_update_strreset_result(asoc, result);
 677 err:
 678         if (!chunk)
 679                 chunk =  sctp_make_strreset_resp(asoc, result, request_seq);
 680
 681         return chunk;
 682 }
 683
 684 struct sctp_chunk *sctp_process_strreset_tsnreq(
 685                                 struct sctp_association *asoc,
 686                                 union sctp_params param,
 687                                 struct sctp_ulpevent **evp)
 688 {
 689         __u32 init_tsn = 0, next_tsn = 0, max_tsn_seen;
 690         struct sctp_strreset_tsnreq *tsnreq = param.v;
 691         struct sctp_stream *stream = &asoc->stream;
 692         __u32 result = SCTP_STRRESET_DENIED;
 693         __u32 request_seq;
 694         __u16 i;
 695
 696         request_seq = ntohl(tsnreq->request_seq);
 697         if (TSN_lt(asoc->strreset_inseq, request_seq) ||
 698             TSN_lt(request_seq, asoc->strreset_inseq - 2)) {
 699                 result = SCTP_STRRESET_ERR_BAD_SEQNO;
 700                 goto err;
 701         } else if (TSN_lt(request_seq, asoc->strreset_inseq)) {
 702                 i = asoc->strreset_inseq - request_seq - 1;
 703                 result = asoc->strreset_result[i];
 704                 if (result == SCTP_STRRESET_PERFORMED) {
 705                         next_tsn = asoc->ctsn_ack_point + 1;
 706                         init_tsn =
 707                                 sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map) + 1;
 708                 }
 709                 goto err;
 710         }
 711
 712         if (!sctp_outq_is_empty(&asoc->outqueue)) {
 713                 result = SCTP_STRRESET_IN_PROGRESS;
 714                 goto err;
 715         }
 716
 717         asoc->strreset_inseq++;
 718
 719         if (!(asoc->strreset_enable & SCTP_ENABLE_RESET_ASSOC_REQ))
 720                 goto out;
 721
 722         if (asoc->strreset_outstanding) {
 723                 result = SCTP_STRRESET_ERR_IN_PROGRESS;
 724                 goto out;
 725         }
 726
 727         /* G4: The same processing as though a FWD-TSN chunk (as defined in
 728          *     [RFC3758]) with all streams affected and a new cumulative TSN
 729          *     ACK of the Receiver's Next TSN minus 1 were received MUST be
 730          *     performed.
 731          */
 732         max_tsn_seen = sctp_tsnmap_get_max_tsn_seen(&asoc->peer.tsn_map);
 733         asoc->stream.si->report_ftsn(&asoc->ulpq, max_tsn_seen);
 734
 735         /* G1: Compute an appropriate value for the Receiver's Next TSN -- the
 736          *     TSN that the peer should use to send the next DATA chunk.  The
 737          *     value SHOULD be the smallest TSN not acknowledged by the
 738          *     receiver of the request plus 2^31.
 739          */
 740         init_tsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map) + (1 << 31);
 741         sctp_tsnmap_init(&asoc->peer.tsn_map, SCTP_TSN_MAP_INITIAL,
 742                          init_tsn, GFP_ATOMIC);
 743
 744         /* G3: The same processing as though a SACK chunk with no gap report
 745          *     and a cumulative TSN ACK of the Sender's Next TSN minus 1 were
 746          *     received MUST be performed.
 747          */
 748         sctp_outq_free(&asoc->outqueue);
 749
 750         /* G2: Compute an appropriate value for the local endpoint's next TSN,
 751          *     i.e., the next TSN assigned by the receiver of the SSN/TSN reset
 752          *     chunk.  The value SHOULD be the highest TSN sent by the receiver
 753          *     of the request plus 1.
 754          */
 755         next_tsn = asoc->next_tsn;
 756         asoc->ctsn_ack_point = next_tsn - 1;
 757         asoc->adv_peer_ack_point = asoc->ctsn_ack_point;
 758
 759         /* G5:  The next expected and outgoing SSNs MUST be reset to 0 for all
 760          *      incoming and outgoing streams.
 761          */
 762         for (i = 0; i < stream->outcnt; i++) {
 763                 SCTP_SO(stream, i)->mid = 0;
 764                 SCTP_SO(stream, i)->mid_uo = 0;
 765         }
 766         for (i = 0; i < stream->incnt; i++)
 767                 SCTP_SI(stream, i)->mid = 0;
 768
 769         result = SCTP_STRRESET_PERFORMED;
 770
 771         *evp = sctp_ulpevent_make_assoc_reset_event(asoc, 0, init_tsn,
 772                                                     next_tsn, GFP_ATOMIC);
 773
 774 out:
 775         sctp_update_strreset_result(asoc, result);
 776 err:
 777         return sctp_make_strreset_tsnresp(asoc, result, request_seq,
 778                                           next_tsn, init_tsn);
 779 }
 780
 781 struct sctp_chunk *sctp_process_strreset_addstrm_out(
 782                                 struct sctp_association *asoc,
 783                                 union sctp_params param,
 784                                 struct sctp_ulpevent **evp)
 785 {
 786         struct sctp_strreset_addstrm *addstrm = param.v;
 787         struct sctp_stream *stream = &asoc->stream;
 788         __u32 result = SCTP_STRRESET_DENIED;
 789         __u32 request_seq, incnt;
 790         __u16 in, i;
 791
 792         request_seq = ntohl(addstrm->request_seq);
 793         if (TSN_lt(asoc->strreset_inseq, request_seq) ||
 794             TSN_lt(request_seq, asoc->strreset_inseq - 2)) {
 795                 result = SCTP_STRRESET_ERR_BAD_SEQNO;
 796                 goto err;
 797         } else if (TSN_lt(request_seq, asoc->strreset_inseq)) {
 798                 i = asoc->strreset_inseq - request_seq - 1;
 799                 result = asoc->strreset_result[i];
 800                 goto err;
 801         }
 802         asoc->strreset_inseq++;
 803
 804         if (!(asoc->strreset_enable & SCTP_ENABLE_CHANGE_ASSOC_REQ))
 805                 goto out;
 806
 807         in = ntohs(addstrm->number_of_streams);
 808         incnt = stream->incnt + in;
 809         if (!in || incnt > SCTP_MAX_STREAM)
 810                 goto out;
 811
 812         if (sctp_stream_alloc_in(stream, incnt, GFP_ATOMIC))
 813                 goto out;
 814
 815         if (asoc->strreset_chunk) {
 816                 if (!sctp_chunk_lookup_strreset_param(
 817                         asoc, 0, SCTP_PARAM_RESET_ADD_IN_STREAMS)) {
 818                         /* same process with outstanding isn't 0 */
 819                         result = SCTP_STRRESET_ERR_IN_PROGRESS;
 820                         goto out;
 821                 }
 822
 823                 asoc->strreset_outstanding--;
 824                 asoc->strreset_outseq++;
 825
 826                 if (!asoc->strreset_outstanding) {
 827                         struct sctp_transport *t;
 828
 829                         t = asoc->strreset_chunk->transport;
 830                         if (del_timer(&t->reconf_timer))
 831                                 sctp_transport_put(t);
 832
 833                         sctp_chunk_put(asoc->strreset_chunk);
 834                         asoc->strreset_chunk = NULL;
 835                 }
 836         }
 837
 838         stream->incnt = incnt;
 839
 840         result = SCTP_STRRESET_PERFORMED;
 841
 842         *evp = sctp_ulpevent_make_stream_change_event(asoc,
 843                 0, ntohs(addstrm->number_of_streams), 0, GFP_ATOMIC);
 844
 845 out:
 846         sctp_update_strreset_result(asoc, result);
 847 err:
 848         return sctp_make_strreset_resp(asoc, result, request_seq);
 849 }
 850
 851 struct sctp_chunk *sctp_process_strreset_addstrm_in(
 852                                 struct sctp_association *asoc,
 853                                 union sctp_params param,
 854                                 struct sctp_ulpevent **evp)
 855 {
 856         struct sctp_strreset_addstrm *addstrm = param.v;
 857         struct sctp_stream *stream = &asoc->stream;
 858         __u32 result = SCTP_STRRESET_DENIED;
 859         struct sctp_chunk *chunk = NULL;
 860         __u32 request_seq, outcnt;
 861         __u16 out, i;
 862         int ret;
 863
 864         request_seq = ntohl(addstrm->request_seq);
 865         if (TSN_lt(asoc->strreset_inseq, request_seq) ||
 866             TSN_lt(request_seq, asoc->strreset_inseq - 2)) {
 867                 result = SCTP_STRRESET_ERR_BAD_SEQNO;
 868                 goto err;
 869         } else if (TSN_lt(request_seq, asoc->strreset_inseq)) {
 870                 i = asoc->strreset_inseq - request_seq - 1;
 871                 result = asoc->strreset_result[i];
 872                 if (result == SCTP_STRRESET_PERFORMED)
 873                         return NULL;
 874                 goto err;
 875         }
 876         asoc->strreset_inseq++;
 877
 878         if (!(asoc->strreset_enable & SCTP_ENABLE_CHANGE_ASSOC_REQ))
 879                 goto out;
 880
 881         if (asoc->strreset_outstanding) {
 882                 result = SCTP_STRRESET_ERR_IN_PROGRESS;
 883                 goto out;
 884         }
 885
 886         out = ntohs(addstrm->number_of_streams);
 887         outcnt = stream->outcnt + out;
 888         if (!out || outcnt > SCTP_MAX_STREAM)
 889                 goto out;
 890
 891         ret = sctp_stream_alloc_out(stream, outcnt, GFP_ATOMIC);
 892         if (ret)
 893                 goto out;
 894
 895         chunk = sctp_make_strreset_addstrm(asoc, out, 0);
 896         if (!chunk)
 897                 goto out;
 898
 899         asoc->strreset_chunk = chunk;
 900         asoc->strreset_outstanding = 1;
 901         sctp_chunk_hold(asoc->strreset_chunk);
 902
 903         stream->outcnt = outcnt;
 904
 905         result = SCTP_STRRESET_PERFORMED;
 906
 907 out:
 908         sctp_update_strreset_result(asoc, result);
 909 err:
 910         if (!chunk)
 911                 chunk = sctp_make_strreset_resp(asoc, result, request_seq);
 912
 913         return chunk;
 914 }
 915
 916 struct sctp_chunk *sctp_process_strreset_resp(
 917                                 struct sctp_association *asoc,
 918                                 union sctp_params param,
 919                                 struct sctp_ulpevent **evp)
 920 {
 921         struct sctp_stream *stream = &asoc->stream;
 922         struct sctp_strreset_resp *resp = param.v;
 923         struct sctp_transport *t;
 924         __u16 i, nums, flags = 0;
 925         struct sctp_paramhdr *req;
 926         __u32 result;
 927
 928         req = sctp_chunk_lookup_strreset_param(asoc, resp->response_seq, 0);
 929         if (!req)
 930                 return NULL;
 931
 932         result = ntohl(resp->result);
 933         if (result != SCTP_STRRESET_PERFORMED) {
 934                 /* if in progress, do nothing but retransmit */
 935                 if (result == SCTP_STRRESET_IN_PROGRESS)
 936                         return NULL;
 937                 else if (result == SCTP_STRRESET_DENIED)
 938                         flags = SCTP_STREAM_RESET_DENIED;
 939                 else
 940                         flags = SCTP_STREAM_RESET_FAILED;
 941         }
 942
 943         if (req->type == SCTP_PARAM_RESET_OUT_REQUEST) {
 944                 struct sctp_strreset_outreq *outreq;
 945                 __be16 *str_p;
 946
 947                 outreq = (struct sctp_strreset_outreq *)req;
 948                 str_p = outreq->list_of_streams;
 949                 nums = (ntohs(outreq->param_hdr.length) - sizeof(*outreq)) /
 950                        sizeof(__u16);
 951
 952                 if (result == SCTP_STRRESET_PERFORMED) {
 953                         struct sctp_stream_out *sout;
 954                         if (nums) {
 955                                 for (i = 0; i < nums; i++) {
 956                                         sout = SCTP_SO(stream, ntohs(str_p[i]));
 957                                         sout->mid = 0;
 958                                         sout->mid_uo = 0;
 959                                 }
 960                         } else {
 961                                 for (i = 0; i < stream->outcnt; i++) {
 962                                         sout = SCTP_SO(stream, i);
 963                                         sout->mid = 0;
 964                                         sout->mid_uo = 0;
 965                                 }
 966                         }
 967                 }
 968
 969                 flags |= SCTP_STREAM_RESET_OUTGOING_SSN;
 970
 971                 for (i = 0; i < stream->outcnt; i++)
 972                         SCTP_SO(stream, i)->state = SCTP_STREAM_OPEN;
 973
 974                 *evp = sctp_ulpevent_make_stream_reset_event(asoc, flags,
 975                         nums, str_p, GFP_ATOMIC);
 976         } else if (req->type == SCTP_PARAM_RESET_IN_REQUEST) {
 977                 struct sctp_strreset_inreq *inreq;
 978                 __be16 *str_p;
 979
 980                 /* if the result is performed, it's impossible for inreq */
 981                 if (result == SCTP_STRRESET_PERFORMED)
 982                         return NULL;
 983
 984                 inreq = (struct sctp_strreset_inreq *)req;
 985                 str_p = inreq->list_of_streams;
 986                 nums = (ntohs(inreq->param_hdr.length) - sizeof(*inreq)) /
 987                        sizeof(__u16);
 988
 989                 flags |= SCTP_STREAM_RESET_INCOMING_SSN;
 990
 991                 *evp = sctp_ulpevent_make_stream_reset_event(asoc, flags,
 992                         nums, str_p, GFP_ATOMIC);
 993         } else if (req->type == SCTP_PARAM_RESET_TSN_REQUEST) {
 994                 struct sctp_strreset_resptsn *resptsn;
 995                 __u32 stsn, rtsn;
 996
 997                 /* check for resptsn, as sctp_verify_reconf didn't do it*/
 998                 if (ntohs(param.p->length) != sizeof(*resptsn))
 999                         return NULL;
1000
1001                 resptsn = (struct sctp_strreset_resptsn *)resp;
1002                 stsn = ntohl(resptsn->senders_next_tsn);
1003                 rtsn = ntohl(resptsn->receivers_next_tsn);
1004
1005                 if (result == SCTP_STRRESET_PERFORMED) {
1006                         __u32 mtsn = sctp_tsnmap_get_max_tsn_seen(
1007                                                 &asoc->peer.tsn_map);
1008                         LIST_HEAD(temp);
1009
1010                         asoc->stream.si->report_ftsn(&asoc->ulpq, mtsn);
1011
1012                         sctp_tsnmap_init(&asoc->peer.tsn_map,
1013                                          SCTP_TSN_MAP_INITIAL,
1014                                          stsn, GFP_ATOMIC);
1015
1016                         /* Clean up sacked and abandoned queues only. As the
1017                          * out_chunk_list may not be empty, splice it to temp,
1018                          * then get it back after sctp_outq_free is done.
1019                          */
1020                         list_splice_init(&asoc->outqueue.out_chunk_list, &temp);
1021                         sctp_outq_free(&asoc->outqueue);
1022                         list_splice_init(&temp, &asoc->outqueue.out_chunk_list);
1023
1024                         asoc->next_tsn = rtsn;
1025                         asoc->ctsn_ack_point = asoc->next_tsn - 1;
1026                         asoc->adv_peer_ack_point = asoc->ctsn_ack_point;
1027
1028                         for (i = 0; i < stream->outcnt; i++) {
1029                                 SCTP_SO(stream, i)->mid = 0;
1030                                 SCTP_SO(stream, i)->mid_uo = 0;
1031                         }
1032                         for (i = 0; i < stream->incnt; i++)
1033                                 SCTP_SI(stream, i)->mid = 0;
1034                 }
1035
1036                 for (i = 0; i < stream->outcnt; i++)
1037                         SCTP_SO(stream, i)->state = SCTP_STREAM_OPEN;
1038
1039                 *evp = sctp_ulpevent_make_assoc_reset_event(asoc, flags,
1040                         stsn, rtsn, GFP_ATOMIC);
1041         } else if (req->type == SCTP_PARAM_RESET_ADD_OUT_STREAMS) {
1042                 struct sctp_strreset_addstrm *addstrm;
1043                 __u16 number;
1044
1045                 addstrm = (struct sctp_strreset_addstrm *)req;
1046                 nums = ntohs(addstrm->number_of_streams);
1047                 number = stream->outcnt - nums;
1048
1049                 if (result == SCTP_STRRESET_PERFORMED) {
1050                         for (i = number; i < stream->outcnt; i++)
1051                                 SCTP_SO(stream, i)->state = SCTP_STREAM_OPEN;
1052                 } else {
1053                         sctp_stream_shrink_out(stream, number);
1054                         stream->outcnt = number;
1055                 }
1056
1057                 *evp = sctp_ulpevent_make_stream_change_event(asoc, flags,
1058                         0, nums, GFP_ATOMIC);
1059         } else if (req->type == SCTP_PARAM_RESET_ADD_IN_STREAMS) {
1060                 struct sctp_strreset_addstrm *addstrm;
1061
1062                 /* if the result is performed, it's impossible for addstrm in
1063                  * request.
1064                  */
1065                 if (result == SCTP_STRRESET_PERFORMED)
1066                         return NULL;
1067
1068                 addstrm = (struct sctp_strreset_addstrm *)req;
1069                 nums = ntohs(addstrm->number_of_streams);
1070
1071                 *evp = sctp_ulpevent_make_stream_change_event(asoc, flags,
1072                         nums, 0, GFP_ATOMIC);
1073         }
1074
1075         asoc->strreset_outstanding--;
1076         asoc->strreset_outseq++;
1077
1078         /* remove everything for this reconf request */
1079         if (!asoc->strreset_outstanding) {
1080                 t = asoc->strreset_chunk->transport;
1081                 if (del_timer(&t->reconf_timer))
1082                         sctp_transport_put(t);
1083
1084                 sctp_chunk_put(asoc->strreset_chunk);
1085                 asoc->strreset_chunk = NULL;
1086         }
1087
1088         return NULL;
1089 }