net/sctp/stream.c

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