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 (out && str_nums)
 286                 for (i = 0; i < str_nums; i++)
 287                         if (str_list[i] >= stream->outcnt)
 288                                 goto out;
 289
 290         if (in && str_nums)
 291                 for (i = 0; i < str_nums; i++)
 292                         if (str_list[i] >= stream->incnt)
 293                                 goto out;
 294
 295         nstr_list = kcalloc(str_nums, sizeof(__be16), GFP_KERNEL);
 296         if (!nstr_list) {
 297                 retval = -ENOMEM;
 298                 goto out;
 299         }
 300
 301         for (i = 0; i < str_nums; i++)
 302                 nstr_list[i] = htons(str_list[i]);
 303
 304         chunk = sctp_make_strreset_req(asoc, str_nums, nstr_list, out, in);
 305
 306         kfree(nstr_list);
 307
 308         if (!chunk) {
 309                 retval = -ENOMEM;
 310                 goto out;
 311         }
 312
 313         if (out) {
 314                 if (str_nums)
 315                         for (i = 0; i < str_nums; i++)
 316                                 stream->out[str_list[i]].state =
 317                                                        SCTP_STREAM_CLOSED;
 318                 else
 319                         for (i = 0; i < stream->outcnt; i++)
 320                                 stream->out[i].state = SCTP_STREAM_CLOSED;
 321         }
 322
 323         asoc->strreset_chunk = chunk;
 324         sctp_chunk_hold(asoc->strreset_chunk);
 325
 326         retval = sctp_send_reconf(asoc, chunk);
 327         if (retval) {
 328                 sctp_chunk_put(asoc->strreset_chunk);
 329                 asoc->strreset_chunk = NULL;
 330                 if (!out)
 331                         goto out;
 332
 333                 if (str_nums)
 334                         for (i = 0; i < str_nums; i++)
 335                                 stream->out[str_list[i]].state =
 336                                                        SCTP_STREAM_OPEN;
 337                 else
 338                         for (i = 0; i < stream->outcnt; i++)
 339                                 stream->out[i].state = SCTP_STREAM_OPEN;
 340
 341                 goto out;
 342         }
 343
 344         asoc->strreset_outstanding = out + in;
 345
 346 out:
 347         return retval;
 348 }
 349
 350 int sctp_send_reset_assoc(struct sctp_association *asoc)
 351 {
 352         struct sctp_stream *stream = &asoc->stream;
 353         struct sctp_chunk *chunk = NULL;
 354         int retval;
 355         __u16 i;
 356
 357         if (!asoc->peer.reconf_capable ||
 358             !(asoc->strreset_enable & SCTP_ENABLE_RESET_ASSOC_REQ))
 359                 return -ENOPROTOOPT;
 360
 361         if (asoc->strreset_outstanding)
 362                 return -EINPROGRESS;
 363
 364         chunk = sctp_make_strreset_tsnreq(asoc);
 365         if (!chunk)
 366                 return -ENOMEM;
 367
 368         /* Block further xmit of data until this request is completed */
 369         for (i = 0; i < stream->outcnt; i++)
 370                 stream->out[i].state = SCTP_STREAM_CLOSED;
 371
 372         asoc->strreset_chunk = chunk;
 373         sctp_chunk_hold(asoc->strreset_chunk);
 374
 375         retval = sctp_send_reconf(asoc, chunk);
 376         if (retval) {
 377                 sctp_chunk_put(asoc->strreset_chunk);
 378                 asoc->strreset_chunk = NULL;
 379
 380                 for (i = 0; i < stream->outcnt; i++)
 381                         stream->out[i].state = SCTP_STREAM_OPEN;
 382
 383                 return retval;
 384         }
 385
 386         asoc->strreset_outstanding = 1;
 387
 388         return 0;
 389 }
 390
 391 int sctp_send_add_streams(struct sctp_association *asoc,
 392                           struct sctp_add_streams *params)
 393 {
 394         struct sctp_stream *stream = &asoc->stream;
 395         struct sctp_chunk *chunk = NULL;
 396         int retval;
 397         __u32 outcnt, incnt;
 398         __u16 out, in;
 399
 400         if (!asoc->peer.reconf_capable ||
 401             !(asoc->strreset_enable & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
 402                 retval = -ENOPROTOOPT;
 403                 goto out;
 404         }
 405
 406         if (asoc->strreset_outstanding) {
 407                 retval = -EINPROGRESS;
 408                 goto out;
 409         }
 410
 411         out = params->sas_outstrms;
 412         in  = params->sas_instrms;
 413         outcnt = stream->outcnt + out;
 414         incnt = stream->incnt + in;
 415         if (outcnt > SCTP_MAX_STREAM || incnt > SCTP_MAX_STREAM ||
 416             (!out && !in)) {
 417                 retval = -EINVAL;
 418                 goto out;
 419         }
 420
 421         if (out) {
 422                 retval = sctp_stream_alloc_out(stream, outcnt, GFP_KERNEL);
 423                 if (retval)
 424                         goto out;
 425         }
 426
 427         chunk = sctp_make_strreset_addstrm(asoc, out, in);
 428         if (!chunk) {
 429                 retval = -ENOMEM;
 430                 goto out;
 431         }
 432
 433         asoc->strreset_chunk = chunk;
 434         sctp_chunk_hold(asoc->strreset_chunk);
 435
 436         retval = sctp_send_reconf(asoc, chunk);
 437         if (retval) {
 438                 sctp_chunk_put(asoc->strreset_chunk);
 439                 asoc->strreset_chunk = NULL;
 440                 goto out;
 441         }
 442
 443         stream->incnt = incnt;
 444         stream->outcnt = outcnt;
 445
 446         asoc->strreset_outstanding = !!out + !!in;
 447
 448 out:
 449         return retval;
 450 }
 451
 452 static struct sctp_paramhdr *sctp_chunk_lookup_strreset_param(
 453                         struct sctp_association *asoc, __be32 resp_seq,
 454                         __be16 type)
 455 {
 456         struct sctp_chunk *chunk = asoc->strreset_chunk;
 457         struct sctp_reconf_chunk *hdr;
 458         union sctp_params param;
 459
 460         if (!chunk)
 461                 return NULL;
 462
 463         hdr = (struct sctp_reconf_chunk *)chunk->chunk_hdr;
 464         sctp_walk_params(param, hdr, params) {
 465                 /* sctp_strreset_tsnreq is actually the basic structure
 466                  * of all stream reconf params, so it's safe to use it
 467                  * to access request_seq.
 468                  */
 469                 struct sctp_strreset_tsnreq *req = param.v;
 470
 471                 if ((!resp_seq || req->request_seq == resp_seq) &&
 472                     (!type || type == req->param_hdr.type))
 473                         return param.v;
 474         }
 475
 476         return NULL;
 477 }
 478
 479 static void sctp_update_strreset_result(struct sctp_association *asoc,
 480                                         __u32 result)
 481 {
 482         asoc->strreset_result[1] = asoc->strreset_result[0];
 483         asoc->strreset_result[0] = result;
 484 }
 485
 486 struct sctp_chunk *sctp_process_strreset_outreq(
 487                                 struct sctp_association *asoc,
 488                                 union sctp_params param,
 489                                 struct sctp_ulpevent **evp)
 490 {
 491         struct sctp_strreset_outreq *outreq = param.v;
 492         struct sctp_stream *stream = &asoc->stream;
 493         __u32 result = SCTP_STRRESET_DENIED;
 494         __u16 i, nums, flags = 0;
 495         __be16 *str_p = NULL;
 496         __u32 request_seq;
 497
 498         request_seq = ntohl(outreq->request_seq);
 499
 500         if (ntohl(outreq->send_reset_at_tsn) >
 501             sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map)) {
 502                 result = SCTP_STRRESET_IN_PROGRESS;
 503                 goto err;
 504         }
 505
 506         if (TSN_lt(asoc->strreset_inseq, request_seq) ||
 507             TSN_lt(request_seq, asoc->strreset_inseq - 2)) {
 508                 result = SCTP_STRRESET_ERR_BAD_SEQNO;
 509                 goto err;
 510         } else if (TSN_lt(request_seq, asoc->strreset_inseq)) {
 511                 i = asoc->strreset_inseq - request_seq - 1;
 512                 result = asoc->strreset_result[i];
 513                 goto err;
 514         }
 515         asoc->strreset_inseq++;
 516
 517         /* Check strreset_enable after inseq inc, as sender cannot tell
 518          * the peer doesn't enable strreset after receiving response with
 519          * result denied, as well as to keep consistent with bsd.
 520          */
 521         if (!(asoc->strreset_enable & SCTP_ENABLE_RESET_STREAM_REQ))
 522                 goto out;
 523
 524         if (asoc->strreset_chunk) {
 525                 if (!sctp_chunk_lookup_strreset_param(
 526                                 asoc, outreq->response_seq,
 527                                 SCTP_PARAM_RESET_IN_REQUEST)) {
 528                         /* same process with outstanding isn't 0 */
 529                         result = SCTP_STRRESET_ERR_IN_PROGRESS;
 530                         goto out;
 531                 }
 532
 533                 asoc->strreset_outstanding--;
 534                 asoc->strreset_outseq++;
 535
 536                 if (!asoc->strreset_outstanding) {
 537                         struct sctp_transport *t;
 538
 539                         t = asoc->strreset_chunk->transport;
 540                         if (del_timer(&t->reconf_timer))
 541                                 sctp_transport_put(t);
 542
 543                         sctp_chunk_put(asoc->strreset_chunk);
 544                         asoc->strreset_chunk = NULL;
 545                 }
 546
 547                 flags = SCTP_STREAM_RESET_INCOMING_SSN;
 548         }
 549
 550         nums = (ntohs(param.p->length) - sizeof(*outreq)) / 2;
 551         if (nums) {
 552                 str_p = outreq->list_of_streams;
 553                 for (i = 0; i < nums; i++) {
 554                         if (ntohs(str_p[i]) >= stream->incnt) {
 555                                 result = SCTP_STRRESET_ERR_WRONG_SSN;
 556                                 goto out;
 557                         }
 558                 }
 559
 560                 for (i = 0; i < nums; i++)
 561                         stream->in[ntohs(str_p[i])].ssn = 0;
 562         } else {
 563                 for (i = 0; i < stream->incnt; i++)
 564                         stream->in[i].ssn = 0;
 565         }
 566
 567         result = SCTP_STRRESET_PERFORMED;
 568
 569         *evp = sctp_ulpevent_make_stream_reset_event(asoc,
 570                 flags | SCTP_STREAM_RESET_OUTGOING_SSN, nums, str_p,
 571                 GFP_ATOMIC);
 572
 573 out:
 574         sctp_update_strreset_result(asoc, result);
 575 err:
 576         return sctp_make_strreset_resp(asoc, result, request_seq);
 577 }
 578
 579 struct sctp_chunk *sctp_process_strreset_inreq(
 580                                 struct sctp_association *asoc,
 581                                 union sctp_params param,
 582                                 struct sctp_ulpevent **evp)
 583 {
 584         struct sctp_strreset_inreq *inreq = param.v;
 585         struct sctp_stream *stream = &asoc->stream;
 586         __u32 result = SCTP_STRRESET_DENIED;
 587         struct sctp_chunk *chunk = NULL;
 588         __u32 request_seq;
 589         __u16 i, nums;
 590         __be16 *str_p;
 591
 592         request_seq = ntohl(inreq->request_seq);
 593         if (TSN_lt(asoc->strreset_inseq, request_seq) ||
 594             TSN_lt(request_seq, asoc->strreset_inseq - 2)) {
 595                 result = SCTP_STRRESET_ERR_BAD_SEQNO;
 596                 goto err;
 597         } else if (TSN_lt(request_seq, asoc->strreset_inseq)) {
 598                 i = asoc->strreset_inseq - request_seq - 1;
 599                 result = asoc->strreset_result[i];
 600                 if (result == SCTP_STRRESET_PERFORMED)
 601                         return NULL;
 602                 goto err;
 603         }
 604         asoc->strreset_inseq++;
 605
 606         if (!(asoc->strreset_enable & SCTP_ENABLE_RESET_STREAM_REQ))
 607                 goto out;
 608
 609         if (asoc->strreset_outstanding) {
 610                 result = SCTP_STRRESET_ERR_IN_PROGRESS;
 611                 goto out;
 612         }
 613
 614         nums = (ntohs(param.p->length) - sizeof(*inreq)) / 2;
 615         str_p = inreq->list_of_streams;
 616         for (i = 0; i < nums; i++) {
 617                 if (ntohs(str_p[i]) >= stream->outcnt) {
 618                         result = SCTP_STRRESET_ERR_WRONG_SSN;
 619                         goto out;
 620                 }
 621         }
 622
 623         chunk = sctp_make_strreset_req(asoc, nums, str_p, 1, 0);
 624         if (!chunk)
 625                 goto out;
 626
 627         if (nums)
 628                 for (i = 0; i < nums; i++)
 629                         stream->out[ntohs(str_p[i])].state =
 630                                                SCTP_STREAM_CLOSED;
 631         else
 632                 for (i = 0; i < stream->outcnt; i++)
 633                         stream->out[i].state = SCTP_STREAM_CLOSED;
 634
 635         asoc->strreset_chunk = chunk;
 636         asoc->strreset_outstanding = 1;
 637         sctp_chunk_hold(asoc->strreset_chunk);
 638
 639         result = SCTP_STRRESET_PERFORMED;
 640
 641         *evp = sctp_ulpevent_make_stream_reset_event(asoc,
 642                 SCTP_STREAM_RESET_INCOMING_SSN, nums, str_p, GFP_ATOMIC);
 643
 644 out:
 645         sctp_update_strreset_result(asoc, result);
 646 err:
 647         if (!chunk)
 648                 chunk =  sctp_make_strreset_resp(asoc, result, request_seq);
 649
 650         return chunk;
 651 }
 652
 653 struct sctp_chunk *sctp_process_strreset_tsnreq(
 654                                 struct sctp_association *asoc,
 655                                 union sctp_params param,
 656                                 struct sctp_ulpevent **evp)
 657 {
 658         __u32 init_tsn = 0, next_tsn = 0, max_tsn_seen;
 659         struct sctp_strreset_tsnreq *tsnreq = param.v;
 660         struct sctp_stream *stream = &asoc->stream;
 661         __u32 result = SCTP_STRRESET_DENIED;
 662         __u32 request_seq;
 663         __u16 i;
 664
 665         request_seq = ntohl(tsnreq->request_seq);
 666         if (TSN_lt(asoc->strreset_inseq, request_seq) ||
 667             TSN_lt(request_seq, asoc->strreset_inseq - 2)) {
 668                 result = SCTP_STRRESET_ERR_BAD_SEQNO;
 669                 goto err;
 670         } else if (TSN_lt(request_seq, asoc->strreset_inseq)) {
 671                 i = asoc->strreset_inseq - request_seq - 1;
 672                 result = asoc->strreset_result[i];
 673                 if (result == SCTP_STRRESET_PERFORMED) {
 674                         next_tsn = asoc->next_tsn;
 675                         init_tsn =
 676                                 sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map) + 1;
 677                 }
 678                 goto err;
 679         }
 680         asoc->strreset_inseq++;
 681
 682         if (!(asoc->strreset_enable & SCTP_ENABLE_RESET_ASSOC_REQ))
 683                 goto out;
 684
 685         if (asoc->strreset_outstanding) {
 686                 result = SCTP_STRRESET_ERR_IN_PROGRESS;
 687                 goto out;
 688         }
 689
 690         /* G3: The same processing as though a SACK chunk with no gap report
 691          *     and a cumulative TSN ACK of the Sender's Next TSN minus 1 were
 692          *     received MUST be performed.
 693          */
 694         max_tsn_seen = sctp_tsnmap_get_max_tsn_seen(&asoc->peer.tsn_map);
 695         sctp_ulpq_reasm_flushtsn(&asoc->ulpq, max_tsn_seen);
 696         sctp_ulpq_abort_pd(&asoc->ulpq, GFP_ATOMIC);
 697
 698         /* G1: Compute an appropriate value for the Receiver's Next TSN -- the
 699          *     TSN that the peer should use to send the next DATA chunk.  The
 700          *     value SHOULD be the smallest TSN not acknowledged by the
 701          *     receiver of the request plus 2^31.
 702          */
 703         init_tsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map) + (1 << 31);
 704         sctp_tsnmap_init(&asoc->peer.tsn_map, SCTP_TSN_MAP_INITIAL,
 705                          init_tsn, GFP_ATOMIC);
 706
 707         /* G4: The same processing as though a FWD-TSN chunk (as defined in
 708          *     [RFC3758]) with all streams affected and a new cumulative TSN
 709          *     ACK of the Receiver's Next TSN minus 1 were received MUST be
 710          *     performed.
 711          */
 712         sctp_outq_free(&asoc->outqueue);
 713
 714         /* G2: Compute an appropriate value for the local endpoint's next TSN,
 715          *     i.e., the next TSN assigned by the receiver of the SSN/TSN reset
 716          *     chunk.  The value SHOULD be the highest TSN sent by the receiver
 717          *     of the request plus 1.
 718          */
 719         next_tsn = asoc->next_tsn;
 720         asoc->ctsn_ack_point = next_tsn - 1;
 721         asoc->adv_peer_ack_point = asoc->ctsn_ack_point;
 722
 723         /* G5:  The next expected and outgoing SSNs MUST be reset to 0 for all
 724          *      incoming and outgoing streams.
 725          */
 726         for (i = 0; i < stream->outcnt; i++)
 727                 stream->out[i].ssn = 0;
 728         for (i = 0; i < stream->incnt; i++)
 729                 stream->in[i].ssn = 0;
 730
 731         result = SCTP_STRRESET_PERFORMED;
 732
 733         *evp = sctp_ulpevent_make_assoc_reset_event(asoc, 0, init_tsn,
 734                                                     next_tsn, GFP_ATOMIC);
 735
 736 out:
 737         sctp_update_strreset_result(asoc, result);
 738 err:
 739         return sctp_make_strreset_tsnresp(asoc, result, request_seq,
 740                                           next_tsn, init_tsn);
 741 }
 742
 743 struct sctp_chunk *sctp_process_strreset_addstrm_out(
 744                                 struct sctp_association *asoc,
 745                                 union sctp_params param,
 746                                 struct sctp_ulpevent **evp)
 747 {
 748         struct sctp_strreset_addstrm *addstrm = param.v;
 749         struct sctp_stream *stream = &asoc->stream;
 750         __u32 result = SCTP_STRRESET_DENIED;
 751         __u32 request_seq, incnt;
 752         __u16 in, i;
 753
 754         request_seq = ntohl(addstrm->request_seq);
 755         if (TSN_lt(asoc->strreset_inseq, request_seq) ||
 756             TSN_lt(request_seq, asoc->strreset_inseq - 2)) {
 757                 result = SCTP_STRRESET_ERR_BAD_SEQNO;
 758                 goto err;
 759         } else if (TSN_lt(request_seq, asoc->strreset_inseq)) {
 760                 i = asoc->strreset_inseq - request_seq - 1;
 761                 result = asoc->strreset_result[i];
 762                 goto err;
 763         }
 764         asoc->strreset_inseq++;
 765
 766         if (!(asoc->strreset_enable & SCTP_ENABLE_CHANGE_ASSOC_REQ))
 767                 goto out;
 768
 769         if (asoc->strreset_chunk) {
 770                 if (!sctp_chunk_lookup_strreset_param(
 771                         asoc, 0, SCTP_PARAM_RESET_ADD_IN_STREAMS)) {
 772                         /* same process with outstanding isn't 0 */
 773                         result = SCTP_STRRESET_ERR_IN_PROGRESS;
 774                         goto out;
 775                 }
 776
 777                 asoc->strreset_outstanding--;
 778                 asoc->strreset_outseq++;
 779
 780                 if (!asoc->strreset_outstanding) {
 781                         struct sctp_transport *t;
 782
 783                         t = asoc->strreset_chunk->transport;
 784                         if (del_timer(&t->reconf_timer))
 785                                 sctp_transport_put(t);
 786
 787                         sctp_chunk_put(asoc->strreset_chunk);
 788                         asoc->strreset_chunk = NULL;
 789                 }
 790         }
 791
 792         in = ntohs(addstrm->number_of_streams);
 793         incnt = stream->incnt + in;
 794         if (!in || incnt > SCTP_MAX_STREAM)
 795                 goto out;
 796
 797         if (sctp_stream_alloc_in(stream, incnt, GFP_ATOMIC))
 798                 goto out;
 799
 800         stream->incnt = incnt;
 801
 802         result = SCTP_STRRESET_PERFORMED;
 803
 804         *evp = sctp_ulpevent_make_stream_change_event(asoc,
 805                 0, ntohs(addstrm->number_of_streams), 0, GFP_ATOMIC);
 806
 807 out:
 808         sctp_update_strreset_result(asoc, result);
 809 err:
 810         return sctp_make_strreset_resp(asoc, result, request_seq);
 811 }
 812
 813 struct sctp_chunk *sctp_process_strreset_addstrm_in(
 814                                 struct sctp_association *asoc,
 815                                 union sctp_params param,
 816                                 struct sctp_ulpevent **evp)
 817 {
 818         struct sctp_strreset_addstrm *addstrm = param.v;
 819         struct sctp_stream *stream = &asoc->stream;
 820         __u32 result = SCTP_STRRESET_DENIED;
 821         struct sctp_chunk *chunk = NULL;
 822         __u32 request_seq, outcnt;
 823         __u16 out, i;
 824         int ret;
 825
 826         request_seq = ntohl(addstrm->request_seq);
 827         if (TSN_lt(asoc->strreset_inseq, request_seq) ||
 828             TSN_lt(request_seq, asoc->strreset_inseq - 2)) {
 829                 result = SCTP_STRRESET_ERR_BAD_SEQNO;
 830                 goto err;
 831         } else if (TSN_lt(request_seq, asoc->strreset_inseq)) {
 832                 i = asoc->strreset_inseq - request_seq - 1;
 833                 result = asoc->strreset_result[i];
 834                 if (result == SCTP_STRRESET_PERFORMED)
 835                         return NULL;
 836                 goto err;
 837         }
 838         asoc->strreset_inseq++;
 839
 840         if (!(asoc->strreset_enable & SCTP_ENABLE_CHANGE_ASSOC_REQ))
 841                 goto out;
 842
 843         if (asoc->strreset_outstanding) {
 844                 result = SCTP_STRRESET_ERR_IN_PROGRESS;
 845                 goto out;
 846         }
 847
 848         out = ntohs(addstrm->number_of_streams);
 849         outcnt = stream->outcnt + out;
 850         if (!out || outcnt > SCTP_MAX_STREAM)
 851                 goto out;
 852
 853         ret = sctp_stream_alloc_out(stream, outcnt, GFP_ATOMIC);
 854         if (ret)
 855                 goto out;
 856
 857         chunk = sctp_make_strreset_addstrm(asoc, out, 0);
 858         if (!chunk)
 859                 goto out;
 860
 861         asoc->strreset_chunk = chunk;
 862         asoc->strreset_outstanding = 1;
 863         sctp_chunk_hold(asoc->strreset_chunk);
 864
 865         stream->outcnt = outcnt;
 866
 867         result = SCTP_STRRESET_PERFORMED;
 868
 869         *evp = sctp_ulpevent_make_stream_change_event(asoc,
 870                 0, 0, ntohs(addstrm->number_of_streams), GFP_ATOMIC);
 871
 872 out:
 873         sctp_update_strreset_result(asoc, result);
 874 err:
 875         if (!chunk)
 876                 chunk = sctp_make_strreset_resp(asoc, result, request_seq);
 877
 878         return chunk;
 879 }
 880
 881 struct sctp_chunk *sctp_process_strreset_resp(
 882                                 struct sctp_association *asoc,
 883                                 union sctp_params param,
 884                                 struct sctp_ulpevent **evp)
 885 {
 886         struct sctp_stream *stream = &asoc->stream;
 887         struct sctp_strreset_resp *resp = param.v;
 888         struct sctp_transport *t;
 889         __u16 i, nums, flags = 0;
 890         struct sctp_paramhdr *req;
 891         __u32 result;
 892
 893         req = sctp_chunk_lookup_strreset_param(asoc, resp->response_seq, 0);
 894         if (!req)
 895                 return NULL;
 896
 897         result = ntohl(resp->result);
 898         if (result != SCTP_STRRESET_PERFORMED) {
 899                 /* if in progress, do nothing but retransmit */
 900                 if (result == SCTP_STRRESET_IN_PROGRESS)
 901                         return NULL;
 902                 else if (result == SCTP_STRRESET_DENIED)
 903                         flags = SCTP_STREAM_RESET_DENIED;
 904                 else
 905                         flags = SCTP_STREAM_RESET_FAILED;
 906         }
 907
 908         if (req->type == SCTP_PARAM_RESET_OUT_REQUEST) {
 909                 struct sctp_strreset_outreq *outreq;
 910                 __be16 *str_p;
 911
 912                 outreq = (struct sctp_strreset_outreq *)req;
 913                 str_p = outreq->list_of_streams;
 914                 nums = (ntohs(outreq->param_hdr.length) - sizeof(*outreq)) / 2;
 915
 916                 if (result == SCTP_STRRESET_PERFORMED) {
 917                         if (nums) {
 918                                 for (i = 0; i < nums; i++)
 919                                         stream->out[ntohs(str_p[i])].ssn = 0;
 920                         } else {
 921                                 for (i = 0; i < stream->outcnt; i++)
 922                                         stream->out[i].ssn = 0;
 923                         }
 924
 925                         flags = SCTP_STREAM_RESET_OUTGOING_SSN;
 926                 }
 927
 928                 for (i = 0; i < stream->outcnt; i++)
 929                         stream->out[i].state = SCTP_STREAM_OPEN;
 930
 931                 *evp = sctp_ulpevent_make_stream_reset_event(asoc, flags,
 932                         nums, str_p, GFP_ATOMIC);
 933         } else if (req->type == SCTP_PARAM_RESET_IN_REQUEST) {
 934                 struct sctp_strreset_inreq *inreq;
 935                 __be16 *str_p;
 936
 937                 /* if the result is performed, it's impossible for inreq */
 938                 if (result == SCTP_STRRESET_PERFORMED)
 939                         return NULL;
 940
 941                 inreq = (struct sctp_strreset_inreq *)req;
 942                 str_p = inreq->list_of_streams;
 943                 nums = (ntohs(inreq->param_hdr.length) - sizeof(*inreq)) / 2;
 944
 945                 *evp = sctp_ulpevent_make_stream_reset_event(asoc, flags,
 946                         nums, str_p, GFP_ATOMIC);
 947         } else if (req->type == SCTP_PARAM_RESET_TSN_REQUEST) {
 948                 struct sctp_strreset_resptsn *resptsn;
 949                 __u32 stsn, rtsn;
 950
 951                 /* check for resptsn, as sctp_verify_reconf didn't do it*/
 952                 if (ntohs(param.p->length) != sizeof(*resptsn))
 953                         return NULL;
 954
 955                 resptsn = (struct sctp_strreset_resptsn *)resp;
 956                 stsn = ntohl(resptsn->senders_next_tsn);
 957                 rtsn = ntohl(resptsn->receivers_next_tsn);
 958
 959                 if (result == SCTP_STRRESET_PERFORMED) {
 960                         __u32 mtsn = sctp_tsnmap_get_max_tsn_seen(
 961                                                 &asoc->peer.tsn_map);
 962
 963                         sctp_ulpq_reasm_flushtsn(&asoc->ulpq, mtsn);
 964                         sctp_ulpq_abort_pd(&asoc->ulpq, GFP_ATOMIC);
 965
 966                         sctp_tsnmap_init(&asoc->peer.tsn_map,
 967                                          SCTP_TSN_MAP_INITIAL,
 968                                          stsn, GFP_ATOMIC);
 969
 970                         sctp_outq_free(&asoc->outqueue);
 971
 972                         asoc->next_tsn = rtsn;
 973                         asoc->ctsn_ack_point = asoc->next_tsn - 1;
 974                         asoc->adv_peer_ack_point = asoc->ctsn_ack_point;
 975
 976                         for (i = 0; i < stream->outcnt; i++)
 977                                 stream->out[i].ssn = 0;
 978                         for (i = 0; i < stream->incnt; i++)
 979                                 stream->in[i].ssn = 0;
 980                 }
 981
 982                 for (i = 0; i < stream->outcnt; i++)
 983                         stream->out[i].state = SCTP_STREAM_OPEN;
 984
 985                 *evp = sctp_ulpevent_make_assoc_reset_event(asoc, flags,
 986                         stsn, rtsn, GFP_ATOMIC);
 987         } else if (req->type == SCTP_PARAM_RESET_ADD_OUT_STREAMS) {
 988                 struct sctp_strreset_addstrm *addstrm;
 989                 __u16 number;
 990
 991                 addstrm = (struct sctp_strreset_addstrm *)req;
 992                 nums = ntohs(addstrm->number_of_streams);
 993                 number = stream->outcnt - nums;
 994
 995                 if (result == SCTP_STRRESET_PERFORMED)
 996                         for (i = number; i < stream->outcnt; i++)
 997                                 stream->out[i].state = SCTP_STREAM_OPEN;
 998                 else
 999                         stream->outcnt = number;
1000
1001                 *evp = sctp_ulpevent_make_stream_change_event(asoc, flags,
1002                         0, nums, GFP_ATOMIC);
1003         } else if (req->type == SCTP_PARAM_RESET_ADD_IN_STREAMS) {
1004                 struct sctp_strreset_addstrm *addstrm;
1005
1006                 /* if the result is performed, it's impossible for addstrm in
1007                  * request.
1008                  */
1009                 if (result == SCTP_STRRESET_PERFORMED)
1010                         return NULL;
1011
1012                 addstrm = (struct sctp_strreset_addstrm *)req;
1013                 nums = ntohs(addstrm->number_of_streams);
1014
1015                 *evp = sctp_ulpevent_make_stream_change_event(asoc, flags,
1016                         nums, 0, GFP_ATOMIC);
1017         }
1018
1019         asoc->strreset_outstanding--;
1020         asoc->strreset_outseq++;
1021
1022         /* remove everything for this reconf request */
1023         if (!asoc->strreset_outstanding) {
1024                 t = asoc->strreset_chunk->transport;
1025                 if (del_timer(&t->reconf_timer))
1026                         sctp_transport_put(t);
1027
1028                 sctp_chunk_put(asoc->strreset_chunk);
1029                 asoc->strreset_chunk = NULL;
1030         }
1031
1032         return NULL;
1033 }