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, (__force __u32)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         ret = sctp_stream_alloc_out(stream, outcnt, gfp);
 160         if (ret)
 161                 goto out;
 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         ret = sctp_stream_alloc_in(stream, incnt, gfp);
 174         if (ret) {
 175                 sched->free(stream);
 176                 kfree(stream->out);
 177                 stream->out = NULL;
 178                 stream->outcnt = 0;
 179                 goto out;
 180         }
 181
 182         stream->incnt = incnt;
 183
 184 out:
 185         return ret;
 186 }
 187
 188 int sctp_stream_init_ext(struct sctp_stream *stream, __u16 sid)
 189 {
 190         struct sctp_stream_out_ext *soute;
 191
 192         soute = kzalloc(sizeof(*soute), GFP_KERNEL);
 193         if (!soute)
 194                 return -ENOMEM;
 195         stream->out[sid].ext = soute;
 196
 197         return sctp_sched_init_sid(stream, sid, GFP_KERNEL);
 198 }
 199
 200 void sctp_stream_free(struct sctp_stream *stream)
 201 {
 202         struct sctp_sched_ops *sched = sctp_sched_ops_from_stream(stream);
 203         int i;
 204
 205         sched->free(stream);
 206         for (i = 0; i < stream->outcnt; i++)
 207                 kfree(stream->out[i].ext);
 208         kfree(stream->out);
 209         kfree(stream->in);
 210 }
 211
 212 void sctp_stream_clear(struct sctp_stream *stream)
 213 {
 214         int i;
 215
 216         for (i = 0; i < stream->outcnt; i++)
 217                 stream->out[i].ssn = 0;
 218
 219         for (i = 0; i < stream->incnt; i++)
 220                 stream->in[i].ssn = 0;
 221 }
 222
 223 void sctp_stream_update(struct sctp_stream *stream, struct sctp_stream *new)
 224 {
 225         struct sctp_sched_ops *sched = sctp_sched_ops_from_stream(stream);
 226
 227         sched->unsched_all(stream);
 228         sctp_stream_outq_migrate(stream, new, new->outcnt);
 229         sctp_stream_free(stream);
 230
 231         stream->out = new->out;
 232         stream->in  = new->in;
 233         stream->outcnt = new->outcnt;
 234         stream->incnt  = new->incnt;
 235
 236         sched->sched_all(stream);
 237
 238         new->out = NULL;
 239         new->in  = NULL;
 240 }
 241
 242 static int sctp_send_reconf(struct sctp_association *asoc,
 243                             struct sctp_chunk *chunk)
 244 {
 245         struct net *net = sock_net(asoc->base.sk);
 246         int retval = 0;
 247
 248         retval = sctp_primitive_RECONF(net, asoc, chunk);
 249         if (retval)
 250                 sctp_chunk_free(chunk);
 251
 252         return retval;
 253 }
 254
 255 static bool sctp_stream_outq_is_empty(struct sctp_stream *stream,
 256                                       __u16 str_nums, __be16 *str_list)
 257 {
 258         struct sctp_association *asoc;
 259         __u16 i;
 260
 261         asoc = container_of(stream, struct sctp_association, stream);
 262         if (!asoc->outqueue.out_qlen)
 263                 return true;
 264
 265         if (!str_nums)
 266                 return false;
 267
 268         for (i = 0; i < str_nums; i++) {
 269                 __u16 sid = ntohs(str_list[i]);
 270
 271                 if (stream->out[sid].ext &&
 272                     !list_empty(&stream->out[sid].ext->outq))
 273                         return false;
 274         }
 275
 276         return true;
 277 }
 278
 279 int sctp_send_reset_streams(struct sctp_association *asoc,
 280                             struct sctp_reset_streams *params)
 281 {
 282         struct sctp_stream *stream = &asoc->stream;
 283         __u16 i, str_nums, *str_list;
 284         struct sctp_chunk *chunk;
 285         int retval = -EINVAL;
 286         __be16 *nstr_list;
 287         bool out, in;
 288
 289         if (!asoc->peer.reconf_capable ||
 290             !(asoc->strreset_enable & SCTP_ENABLE_RESET_STREAM_REQ)) {
 291                 retval = -ENOPROTOOPT;
 292                 goto out;
 293         }
 294
 295         if (asoc->strreset_outstanding) {
 296                 retval = -EINPROGRESS;
 297                 goto out;
 298         }
 299
 300         out = params->srs_flags & SCTP_STREAM_RESET_OUTGOING;
 301         in  = params->srs_flags & SCTP_STREAM_RESET_INCOMING;
 302         if (!out && !in)
 303                 goto out;
 304
 305         str_nums = params->srs_number_streams;
 306         str_list = params->srs_stream_list;
 307         if (str_nums) {
 308                 int param_len = 0;
 309
 310                 if (out) {
 311                         for (i = 0; i < str_nums; i++)
 312                                 if (str_list[i] >= stream->outcnt)
 313                                         goto out;
 314
 315                         param_len = str_nums * sizeof(__u16) +
 316                                     sizeof(struct sctp_strreset_outreq);
 317                 }
 318
 319                 if (in) {
 320                         for (i = 0; i < str_nums; i++)
 321                                 if (str_list[i] >= stream->incnt)
 322                                         goto out;
 323
 324                         param_len += str_nums * sizeof(__u16) +
 325                                      sizeof(struct sctp_strreset_inreq);
 326                 }
 327
 328                 if (param_len > SCTP_MAX_CHUNK_LEN -
 329                                 sizeof(struct sctp_reconf_chunk))
 330                         goto out;
 331         }
 332
 333         nstr_list = kcalloc(str_nums, sizeof(__be16), GFP_KERNEL);
 334         if (!nstr_list) {
 335                 retval = -ENOMEM;
 336                 goto out;
 337         }
 338
 339         for (i = 0; i < str_nums; i++)
 340                 nstr_list[i] = htons(str_list[i]);
 341
 342         if (out && !sctp_stream_outq_is_empty(stream, str_nums, nstr_list)) {
 343                 retval = -EAGAIN;
 344                 goto out;
 345         }
 346
 347         chunk = sctp_make_strreset_req(asoc, str_nums, nstr_list, out, in);
 348
 349         kfree(nstr_list);
 350
 351         if (!chunk) {
 352                 retval = -ENOMEM;
 353                 goto out;
 354         }
 355
 356         if (out) {
 357                 if (str_nums)
 358                         for (i = 0; i < str_nums; i++)
 359                                 stream->out[str_list[i]].state =
 360                                                        SCTP_STREAM_CLOSED;
 361                 else
 362                         for (i = 0; i < stream->outcnt; i++)
 363                                 stream->out[i].state = SCTP_STREAM_CLOSED;
 364         }
 365
 366         asoc->strreset_chunk = chunk;
 367         sctp_chunk_hold(asoc->strreset_chunk);
 368
 369         retval = sctp_send_reconf(asoc, chunk);
 370         if (retval) {
 371                 sctp_chunk_put(asoc->strreset_chunk);
 372                 asoc->strreset_chunk = NULL;
 373                 if (!out)
 374                         goto out;
 375
 376                 if (str_nums)
 377                         for (i = 0; i < str_nums; i++)
 378                                 stream->out[str_list[i]].state =
 379                                                        SCTP_STREAM_OPEN;
 380                 else
 381                         for (i = 0; i < stream->outcnt; i++)
 382                                 stream->out[i].state = SCTP_STREAM_OPEN;
 383
 384                 goto out;
 385         }
 386
 387         asoc->strreset_outstanding = out + in;
 388
 389 out:
 390         return retval;
 391 }
 392
 393 int sctp_send_reset_assoc(struct sctp_association *asoc)
 394 {
 395         struct sctp_stream *stream = &asoc->stream;
 396         struct sctp_chunk *chunk = NULL;
 397         int retval;
 398         __u16 i;
 399
 400         if (!asoc->peer.reconf_capable ||
 401             !(asoc->strreset_enable & SCTP_ENABLE_RESET_ASSOC_REQ))
 402                 return -ENOPROTOOPT;
 403
 404         if (asoc->strreset_outstanding)
 405                 return -EINPROGRESS;
 406
 407         if (!sctp_outq_is_empty(&asoc->outqueue))
 408                 return -EAGAIN;
 409
 410         chunk = sctp_make_strreset_tsnreq(asoc);
 411         if (!chunk)
 412                 return -ENOMEM;
 413
 414         /* Block further xmit of data until this request is completed */
 415         for (i = 0; i < stream->outcnt; i++)
 416                 stream->out[i].state = SCTP_STREAM_CLOSED;
 417
 418         asoc->strreset_chunk = chunk;
 419         sctp_chunk_hold(asoc->strreset_chunk);
 420
 421         retval = sctp_send_reconf(asoc, chunk);
 422         if (retval) {
 423                 sctp_chunk_put(asoc->strreset_chunk);
 424                 asoc->strreset_chunk = NULL;
 425
 426                 for (i = 0; i < stream->outcnt; i++)
 427                         stream->out[i].state = SCTP_STREAM_OPEN;
 428
 429                 return retval;
 430         }
 431
 432         asoc->strreset_outstanding = 1;
 433
 434         return 0;
 435 }
 436
 437 int sctp_send_add_streams(struct sctp_association *asoc,
 438                           struct sctp_add_streams *params)
 439 {
 440         struct sctp_stream *stream = &asoc->stream;
 441         struct sctp_chunk *chunk = NULL;
 442         int retval;
 443         __u32 outcnt, incnt;
 444         __u16 out, in;
 445
 446         if (!asoc->peer.reconf_capable ||
 447             !(asoc->strreset_enable & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
 448                 retval = -ENOPROTOOPT;
 449                 goto out;
 450         }
 451
 452         if (asoc->strreset_outstanding) {
 453                 retval = -EINPROGRESS;
 454                 goto out;
 455         }
 456
 457         out = params->sas_outstrms;
 458         in  = params->sas_instrms;
 459         outcnt = stream->outcnt + out;
 460         incnt = stream->incnt + in;
 461         if (outcnt > SCTP_MAX_STREAM || incnt > SCTP_MAX_STREAM ||
 462             (!out && !in)) {
 463                 retval = -EINVAL;
 464                 goto out;
 465         }
 466
 467         if (out) {
 468                 retval = sctp_stream_alloc_out(stream, outcnt, GFP_KERNEL);
 469                 if (retval)
 470                         goto out;
 471         }
 472
 473         chunk = sctp_make_strreset_addstrm(asoc, out, in);
 474         if (!chunk) {
 475                 retval = -ENOMEM;
 476                 goto out;
 477         }
 478
 479         asoc->strreset_chunk = chunk;
 480         sctp_chunk_hold(asoc->strreset_chunk);
 481
 482         retval = sctp_send_reconf(asoc, chunk);
 483         if (retval) {
 484                 sctp_chunk_put(asoc->strreset_chunk);
 485                 asoc->strreset_chunk = NULL;
 486                 goto out;
 487         }
 488
 489         stream->incnt = incnt;
 490         stream->outcnt = outcnt;
 491
 492         asoc->strreset_outstanding = !!out + !!in;
 493
 494 out:
 495         return retval;
 496 }
 497
 498 static struct sctp_paramhdr *sctp_chunk_lookup_strreset_param(
 499                         struct sctp_association *asoc, __be32 resp_seq,
 500                         __be16 type)
 501 {
 502         struct sctp_chunk *chunk = asoc->strreset_chunk;
 503         struct sctp_reconf_chunk *hdr;
 504         union sctp_params param;
 505
 506         if (!chunk)
 507                 return NULL;
 508
 509         hdr = (struct sctp_reconf_chunk *)chunk->chunk_hdr;
 510         sctp_walk_params(param, hdr, params) {
 511                 /* sctp_strreset_tsnreq is actually the basic structure
 512                  * of all stream reconf params, so it's safe to use it
 513                  * to access request_seq.
 514                  */
 515                 struct sctp_strreset_tsnreq *req = param.v;
 516
 517                 if ((!resp_seq || req->request_seq == resp_seq) &&
 518                     (!type || type == req->param_hdr.type))
 519                         return param.v;
 520         }
 521
 522         return NULL;
 523 }
 524
 525 static void sctp_update_strreset_result(struct sctp_association *asoc,
 526                                         __u32 result)
 527 {
 528         asoc->strreset_result[1] = asoc->strreset_result[0];
 529         asoc->strreset_result[0] = result;
 530 }
 531
 532 struct sctp_chunk *sctp_process_strreset_outreq(
 533                                 struct sctp_association *asoc,
 534                                 union sctp_params param,
 535                                 struct sctp_ulpevent **evp)
 536 {
 537         struct sctp_strreset_outreq *outreq = param.v;
 538         struct sctp_stream *stream = &asoc->stream;
 539         __u32 result = SCTP_STRRESET_DENIED;
 540         __u16 i, nums, flags = 0;
 541         __be16 *str_p = NULL;
 542         __u32 request_seq;
 543
 544         request_seq = ntohl(outreq->request_seq);
 545
 546         if (ntohl(outreq->send_reset_at_tsn) >
 547             sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map)) {
 548                 result = SCTP_STRRESET_IN_PROGRESS;
 549                 goto err;
 550         }
 551
 552         if (TSN_lt(asoc->strreset_inseq, request_seq) ||
 553             TSN_lt(request_seq, asoc->strreset_inseq - 2)) {
 554                 result = SCTP_STRRESET_ERR_BAD_SEQNO;
 555                 goto err;
 556         } else if (TSN_lt(request_seq, asoc->strreset_inseq)) {
 557                 i = asoc->strreset_inseq - request_seq - 1;
 558                 result = asoc->strreset_result[i];
 559                 goto err;
 560         }
 561         asoc->strreset_inseq++;
 562
 563         /* Check strreset_enable after inseq inc, as sender cannot tell
 564          * the peer doesn't enable strreset after receiving response with
 565          * result denied, as well as to keep consistent with bsd.
 566          */
 567         if (!(asoc->strreset_enable & SCTP_ENABLE_RESET_STREAM_REQ))
 568                 goto out;
 569
 570         if (asoc->strreset_chunk) {
 571                 if (!sctp_chunk_lookup_strreset_param(
 572                                 asoc, outreq->response_seq,
 573                                 SCTP_PARAM_RESET_IN_REQUEST)) {
 574                         /* same process with outstanding isn't 0 */
 575                         result = SCTP_STRRESET_ERR_IN_PROGRESS;
 576                         goto out;
 577                 }
 578
 579                 asoc->strreset_outstanding--;
 580                 asoc->strreset_outseq++;
 581
 582                 if (!asoc->strreset_outstanding) {
 583                         struct sctp_transport *t;
 584
 585                         t = asoc->strreset_chunk->transport;
 586                         if (del_timer(&t->reconf_timer))
 587                                 sctp_transport_put(t);
 588
 589                         sctp_chunk_put(asoc->strreset_chunk);
 590                         asoc->strreset_chunk = NULL;
 591                 }
 592
 593                 flags = SCTP_STREAM_RESET_INCOMING_SSN;
 594         }
 595
 596         nums = (ntohs(param.p->length) - sizeof(*outreq)) / sizeof(__u16);
 597         if (nums) {
 598                 str_p = outreq->list_of_streams;
 599                 for (i = 0; i < nums; i++) {
 600                         if (ntohs(str_p[i]) >= stream->incnt) {
 601                                 result = SCTP_STRRESET_ERR_WRONG_SSN;
 602                                 goto out;
 603                         }
 604                 }
 605
 606                 for (i = 0; i < nums; i++)
 607                         stream->in[ntohs(str_p[i])].ssn = 0;
 608         } else {
 609                 for (i = 0; i < stream->incnt; i++)
 610                         stream->in[i].ssn = 0;
 611         }
 612
 613         result = SCTP_STRRESET_PERFORMED;
 614
 615         *evp = sctp_ulpevent_make_stream_reset_event(asoc,
 616                 flags | SCTP_STREAM_RESET_OUTGOING_SSN, nums, str_p,
 617                 GFP_ATOMIC);
 618
 619 out:
 620         sctp_update_strreset_result(asoc, result);
 621 err:
 622         return sctp_make_strreset_resp(asoc, result, request_seq);
 623 }
 624
 625 struct sctp_chunk *sctp_process_strreset_inreq(
 626                                 struct sctp_association *asoc,
 627                                 union sctp_params param,
 628                                 struct sctp_ulpevent **evp)
 629 {
 630         struct sctp_strreset_inreq *inreq = param.v;
 631         struct sctp_stream *stream = &asoc->stream;
 632         __u32 result = SCTP_STRRESET_DENIED;
 633         struct sctp_chunk *chunk = NULL;
 634         __u32 request_seq;
 635         __u16 i, nums;
 636         __be16 *str_p;
 637
 638         request_seq = ntohl(inreq->request_seq);
 639         if (TSN_lt(asoc->strreset_inseq, request_seq) ||
 640             TSN_lt(request_seq, asoc->strreset_inseq - 2)) {
 641                 result = SCTP_STRRESET_ERR_BAD_SEQNO;
 642                 goto err;
 643         } else if (TSN_lt(request_seq, asoc->strreset_inseq)) {
 644                 i = asoc->strreset_inseq - request_seq - 1;
 645                 result = asoc->strreset_result[i];
 646                 if (result == SCTP_STRRESET_PERFORMED)
 647                         return NULL;
 648                 goto err;
 649         }
 650         asoc->strreset_inseq++;
 651
 652         if (!(asoc->strreset_enable & SCTP_ENABLE_RESET_STREAM_REQ))
 653                 goto out;
 654
 655         if (asoc->strreset_outstanding) {
 656                 result = SCTP_STRRESET_ERR_IN_PROGRESS;
 657                 goto out;
 658         }
 659
 660         nums = (ntohs(param.p->length) - sizeof(*inreq)) / sizeof(__u16);
 661         str_p = inreq->list_of_streams;
 662         for (i = 0; i < nums; i++) {
 663                 if (ntohs(str_p[i]) >= stream->outcnt) {
 664                         result = SCTP_STRRESET_ERR_WRONG_SSN;
 665                         goto out;
 666                 }
 667         }
 668
 669         if (!sctp_stream_outq_is_empty(stream, nums, str_p)) {
 670                 result = SCTP_STRRESET_IN_PROGRESS;
 671                 asoc->strreset_inseq--;
 672                 goto err;
 673         }
 674
 675         chunk = sctp_make_strreset_req(asoc, nums, str_p, 1, 0);
 676         if (!chunk)
 677                 goto out;
 678
 679         if (nums)
 680                 for (i = 0; i < nums; i++)
 681                         stream->out[ntohs(str_p[i])].state =
 682                                                SCTP_STREAM_CLOSED;
 683         else
 684                 for (i = 0; i < stream->outcnt; i++)
 685                         stream->out[i].state = SCTP_STREAM_CLOSED;
 686
 687         asoc->strreset_chunk = chunk;
 688         asoc->strreset_outstanding = 1;
 689         sctp_chunk_hold(asoc->strreset_chunk);
 690
 691         result = SCTP_STRRESET_PERFORMED;
 692
 693         *evp = sctp_ulpevent_make_stream_reset_event(asoc,
 694                 SCTP_STREAM_RESET_INCOMING_SSN, nums, str_p, GFP_ATOMIC);
 695
 696 out:
 697         sctp_update_strreset_result(asoc, result);
 698 err:
 699         if (!chunk)
 700                 chunk =  sctp_make_strreset_resp(asoc, result, request_seq);
 701
 702         return chunk;
 703 }
 704
 705 struct sctp_chunk *sctp_process_strreset_tsnreq(
 706                                 struct sctp_association *asoc,
 707                                 union sctp_params param,
 708                                 struct sctp_ulpevent **evp)
 709 {
 710         __u32 init_tsn = 0, next_tsn = 0, max_tsn_seen;
 711         struct sctp_strreset_tsnreq *tsnreq = param.v;
 712         struct sctp_stream *stream = &asoc->stream;
 713         __u32 result = SCTP_STRRESET_DENIED;
 714         __u32 request_seq;
 715         __u16 i;
 716
 717         request_seq = ntohl(tsnreq->request_seq);
 718         if (TSN_lt(asoc->strreset_inseq, request_seq) ||
 719             TSN_lt(request_seq, asoc->strreset_inseq - 2)) {
 720                 result = SCTP_STRRESET_ERR_BAD_SEQNO;
 721                 goto err;
 722         } else if (TSN_lt(request_seq, asoc->strreset_inseq)) {
 723                 i = asoc->strreset_inseq - request_seq - 1;
 724                 result = asoc->strreset_result[i];
 725                 if (result == SCTP_STRRESET_PERFORMED) {
 726                         next_tsn = asoc->ctsn_ack_point + 1;
 727                         init_tsn =
 728                                 sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map) + 1;
 729                 }
 730                 goto err;
 731         }
 732
 733         if (!sctp_outq_is_empty(&asoc->outqueue)) {
 734                 result = SCTP_STRRESET_IN_PROGRESS;
 735                 goto err;
 736         }
 737
 738         asoc->strreset_inseq++;
 739
 740         if (!(asoc->strreset_enable & SCTP_ENABLE_RESET_ASSOC_REQ))
 741                 goto out;
 742
 743         if (asoc->strreset_outstanding) {
 744                 result = SCTP_STRRESET_ERR_IN_PROGRESS;
 745                 goto out;
 746         }
 747
 748         /* G4: The same processing as though a FWD-TSN chunk (as defined in
 749          *     [RFC3758]) with all streams affected and a new cumulative TSN
 750          *     ACK of the Receiver's Next TSN minus 1 were received MUST be
 751          *     performed.
 752          */
 753         max_tsn_seen = sctp_tsnmap_get_max_tsn_seen(&asoc->peer.tsn_map);
 754         sctp_ulpq_reasm_flushtsn(&asoc->ulpq, max_tsn_seen);
 755         sctp_ulpq_abort_pd(&asoc->ulpq, GFP_ATOMIC);
 756
 757         /* G1: Compute an appropriate value for the Receiver's Next TSN -- the
 758          *     TSN that the peer should use to send the next DATA chunk.  The
 759          *     value SHOULD be the smallest TSN not acknowledged by the
 760          *     receiver of the request plus 2^31.
 761          */
 762         init_tsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map) + (1 << 31);
 763         sctp_tsnmap_init(&asoc->peer.tsn_map, SCTP_TSN_MAP_INITIAL,
 764                          init_tsn, GFP_ATOMIC);
 765
 766         /* G3: The same processing as though a SACK chunk with no gap report
 767          *     and a cumulative TSN ACK of the Sender's Next TSN minus 1 were
 768          *     received MUST be performed.
 769          */
 770         sctp_outq_free(&asoc->outqueue);
 771
 772         /* G2: Compute an appropriate value for the local endpoint's next TSN,
 773          *     i.e., the next TSN assigned by the receiver of the SSN/TSN reset
 774          *     chunk.  The value SHOULD be the highest TSN sent by the receiver
 775          *     of the request plus 1.
 776          */
 777         next_tsn = asoc->next_tsn;
 778         asoc->ctsn_ack_point = next_tsn - 1;
 779         asoc->adv_peer_ack_point = asoc->ctsn_ack_point;
 780
 781         /* G5:  The next expected and outgoing SSNs MUST be reset to 0 for all
 782          *      incoming and outgoing streams.
 783          */
 784         for (i = 0; i < stream->outcnt; i++)
 785                 stream->out[i].ssn = 0;
 786         for (i = 0; i < stream->incnt; i++)
 787                 stream->in[i].ssn = 0;
 788
 789         result = SCTP_STRRESET_PERFORMED;
 790
 791         *evp = sctp_ulpevent_make_assoc_reset_event(asoc, 0, init_tsn,
 792                                                     next_tsn, GFP_ATOMIC);
 793
 794 out:
 795         sctp_update_strreset_result(asoc, result);
 796 err:
 797         return sctp_make_strreset_tsnresp(asoc, result, request_seq,
 798                                           next_tsn, init_tsn);
 799 }
 800
 801 struct sctp_chunk *sctp_process_strreset_addstrm_out(
 802                                 struct sctp_association *asoc,
 803                                 union sctp_params param,
 804                                 struct sctp_ulpevent **evp)
 805 {
 806         struct sctp_strreset_addstrm *addstrm = param.v;
 807         struct sctp_stream *stream = &asoc->stream;
 808         __u32 result = SCTP_STRRESET_DENIED;
 809         __u32 request_seq, incnt;
 810         __u16 in, i;
 811
 812         request_seq = ntohl(addstrm->request_seq);
 813         if (TSN_lt(asoc->strreset_inseq, request_seq) ||
 814             TSN_lt(request_seq, asoc->strreset_inseq - 2)) {
 815                 result = SCTP_STRRESET_ERR_BAD_SEQNO;
 816                 goto err;
 817         } else if (TSN_lt(request_seq, asoc->strreset_inseq)) {
 818                 i = asoc->strreset_inseq - request_seq - 1;
 819                 result = asoc->strreset_result[i];
 820                 goto err;
 821         }
 822         asoc->strreset_inseq++;
 823
 824         if (!(asoc->strreset_enable & SCTP_ENABLE_CHANGE_ASSOC_REQ))
 825                 goto out;
 826
 827         if (asoc->strreset_chunk) {
 828                 if (!sctp_chunk_lookup_strreset_param(
 829                         asoc, 0, SCTP_PARAM_RESET_ADD_IN_STREAMS)) {
 830                         /* same process with outstanding isn't 0 */
 831                         result = SCTP_STRRESET_ERR_IN_PROGRESS;
 832                         goto out;
 833                 }
 834
 835                 asoc->strreset_outstanding--;
 836                 asoc->strreset_outseq++;
 837
 838                 if (!asoc->strreset_outstanding) {
 839                         struct sctp_transport *t;
 840
 841                         t = asoc->strreset_chunk->transport;
 842                         if (del_timer(&t->reconf_timer))
 843                                 sctp_transport_put(t);
 844
 845                         sctp_chunk_put(asoc->strreset_chunk);
 846                         asoc->strreset_chunk = NULL;
 847                 }
 848         }
 849
 850         in = ntohs(addstrm->number_of_streams);
 851         incnt = stream->incnt + in;
 852         if (!in || incnt > SCTP_MAX_STREAM)
 853                 goto out;
 854
 855         if (sctp_stream_alloc_in(stream, incnt, GFP_ATOMIC))
 856                 goto out;
 857
 858         stream->incnt = incnt;
 859
 860         result = SCTP_STRRESET_PERFORMED;
 861
 862         *evp = sctp_ulpevent_make_stream_change_event(asoc,
 863                 0, ntohs(addstrm->number_of_streams), 0, GFP_ATOMIC);
 864
 865 out:
 866         sctp_update_strreset_result(asoc, result);
 867 err:
 868         return sctp_make_strreset_resp(asoc, result, request_seq);
 869 }
 870
 871 struct sctp_chunk *sctp_process_strreset_addstrm_in(
 872                                 struct sctp_association *asoc,
 873                                 union sctp_params param,
 874                                 struct sctp_ulpevent **evp)
 875 {
 876         struct sctp_strreset_addstrm *addstrm = param.v;
 877         struct sctp_stream *stream = &asoc->stream;
 878         __u32 result = SCTP_STRRESET_DENIED;
 879         struct sctp_chunk *chunk = NULL;
 880         __u32 request_seq, outcnt;
 881         __u16 out, i;
 882         int ret;
 883
 884         request_seq = ntohl(addstrm->request_seq);
 885         if (TSN_lt(asoc->strreset_inseq, request_seq) ||
 886             TSN_lt(request_seq, asoc->strreset_inseq - 2)) {
 887                 result = SCTP_STRRESET_ERR_BAD_SEQNO;
 888                 goto err;
 889         } else if (TSN_lt(request_seq, asoc->strreset_inseq)) {
 890                 i = asoc->strreset_inseq - request_seq - 1;
 891                 result = asoc->strreset_result[i];
 892                 if (result == SCTP_STRRESET_PERFORMED)
 893                         return NULL;
 894                 goto err;
 895         }
 896         asoc->strreset_inseq++;
 897
 898         if (!(asoc->strreset_enable & SCTP_ENABLE_CHANGE_ASSOC_REQ))
 899                 goto out;
 900
 901         if (asoc->strreset_outstanding) {
 902                 result = SCTP_STRRESET_ERR_IN_PROGRESS;
 903                 goto out;
 904         }
 905
 906         out = ntohs(addstrm->number_of_streams);
 907         outcnt = stream->outcnt + out;
 908         if (!out || outcnt > SCTP_MAX_STREAM)
 909                 goto out;
 910
 911         ret = sctp_stream_alloc_out(stream, outcnt, GFP_ATOMIC);
 912         if (ret)
 913                 goto out;
 914
 915         chunk = sctp_make_strreset_addstrm(asoc, out, 0);
 916         if (!chunk)
 917                 goto out;
 918
 919         asoc->strreset_chunk = chunk;
 920         asoc->strreset_outstanding = 1;
 921         sctp_chunk_hold(asoc->strreset_chunk);
 922
 923         stream->outcnt = outcnt;
 924
 925         result = SCTP_STRRESET_PERFORMED;
 926
 927         *evp = sctp_ulpevent_make_stream_change_event(asoc,
 928                 0, 0, ntohs(addstrm->number_of_streams), GFP_ATOMIC);
 929
 930 out:
 931         sctp_update_strreset_result(asoc, result);
 932 err:
 933         if (!chunk)
 934                 chunk = sctp_make_strreset_resp(asoc, result, request_seq);
 935
 936         return chunk;
 937 }
 938
 939 struct sctp_chunk *sctp_process_strreset_resp(
 940                                 struct sctp_association *asoc,
 941                                 union sctp_params param,
 942                                 struct sctp_ulpevent **evp)
 943 {
 944         struct sctp_stream *stream = &asoc->stream;
 945         struct sctp_strreset_resp *resp = param.v;
 946         struct sctp_transport *t;
 947         __u16 i, nums, flags = 0;
 948         struct sctp_paramhdr *req;
 949         __u32 result;
 950
 951         req = sctp_chunk_lookup_strreset_param(asoc, resp->response_seq, 0);
 952         if (!req)
 953                 return NULL;
 954
 955         result = ntohl(resp->result);
 956         if (result != SCTP_STRRESET_PERFORMED) {
 957                 /* if in progress, do nothing but retransmit */
 958                 if (result == SCTP_STRRESET_IN_PROGRESS)
 959                         return NULL;
 960                 else if (result == SCTP_STRRESET_DENIED)
 961                         flags = SCTP_STREAM_RESET_DENIED;
 962                 else
 963                         flags = SCTP_STREAM_RESET_FAILED;
 964         }
 965
 966         if (req->type == SCTP_PARAM_RESET_OUT_REQUEST) {
 967                 struct sctp_strreset_outreq *outreq;
 968                 __be16 *str_p;
 969
 970                 outreq = (struct sctp_strreset_outreq *)req;
 971                 str_p = outreq->list_of_streams;
 972                 nums = (ntohs(outreq->param_hdr.length) - sizeof(*outreq)) /
 973                        sizeof(__u16);
 974
 975                 if (result == SCTP_STRRESET_PERFORMED) {
 976                         if (nums) {
 977                                 for (i = 0; i < nums; i++)
 978                                         stream->out[ntohs(str_p[i])].ssn = 0;
 979                         } else {
 980                                 for (i = 0; i < stream->outcnt; i++)
 981                                         stream->out[i].ssn = 0;
 982                         }
 983
 984                         flags = SCTP_STREAM_RESET_OUTGOING_SSN;
 985                 }
 986
 987                 for (i = 0; i < stream->outcnt; i++)
 988                         stream->out[i].state = SCTP_STREAM_OPEN;
 989
 990                 *evp = sctp_ulpevent_make_stream_reset_event(asoc, flags,
 991                         nums, str_p, GFP_ATOMIC);
 992         } else if (req->type == SCTP_PARAM_RESET_IN_REQUEST) {
 993                 struct sctp_strreset_inreq *inreq;
 994                 __be16 *str_p;
 995
 996                 /* if the result is performed, it's impossible for inreq */
 997                 if (result == SCTP_STRRESET_PERFORMED)
 998                         return NULL;
 999
1000                 inreq = (struct sctp_strreset_inreq *)req;
1001                 str_p = inreq->list_of_streams;
1002                 nums = (ntohs(inreq->param_hdr.length) - sizeof(*inreq)) /
1003                        sizeof(__u16);
1004
1005                 *evp = sctp_ulpevent_make_stream_reset_event(asoc, flags,
1006                         nums, str_p, GFP_ATOMIC);
1007         } else if (req->type == SCTP_PARAM_RESET_TSN_REQUEST) {
1008                 struct sctp_strreset_resptsn *resptsn;
1009                 __u32 stsn, rtsn;
1010
1011                 /* check for resptsn, as sctp_verify_reconf didn't do it*/
1012                 if (ntohs(param.p->length) != sizeof(*resptsn))
1013                         return NULL;
1014
1015                 resptsn = (struct sctp_strreset_resptsn *)resp;
1016                 stsn = ntohl(resptsn->senders_next_tsn);
1017                 rtsn = ntohl(resptsn->receivers_next_tsn);
1018
1019                 if (result == SCTP_STRRESET_PERFORMED) {
1020                         __u32 mtsn = sctp_tsnmap_get_max_tsn_seen(
1021                                                 &asoc->peer.tsn_map);
1022                         LIST_HEAD(temp);
1023
1024                         sctp_ulpq_reasm_flushtsn(&asoc->ulpq, mtsn);
1025                         sctp_ulpq_abort_pd(&asoc->ulpq, GFP_ATOMIC);
1026
1027                         sctp_tsnmap_init(&asoc->peer.tsn_map,
1028                                          SCTP_TSN_MAP_INITIAL,
1029                                          stsn, GFP_ATOMIC);
1030
1031                         /* Clean up sacked and abandoned queues only. As the
1032                          * out_chunk_list may not be empty, splice it to temp,
1033                          * then get it back after sctp_outq_free is done.
1034                          */
1035                         list_splice_init(&asoc->outqueue.out_chunk_list, &temp);
1036                         sctp_outq_free(&asoc->outqueue);
1037                         list_splice_init(&temp, &asoc->outqueue.out_chunk_list);
1038
1039                         asoc->next_tsn = rtsn;
1040                         asoc->ctsn_ack_point = asoc->next_tsn - 1;
1041                         asoc->adv_peer_ack_point = asoc->ctsn_ack_point;
1042
1043                         for (i = 0; i < stream->outcnt; i++)
1044                                 stream->out[i].ssn = 0;
1045                         for (i = 0; i < stream->incnt; i++)
1046                                 stream->in[i].ssn = 0;
1047                 }
1048
1049                 for (i = 0; i < stream->outcnt; i++)
1050                         stream->out[i].state = SCTP_STREAM_OPEN;
1051
1052                 *evp = sctp_ulpevent_make_assoc_reset_event(asoc, flags,
1053                         stsn, rtsn, GFP_ATOMIC);
1054         } else if (req->type == SCTP_PARAM_RESET_ADD_OUT_STREAMS) {
1055                 struct sctp_strreset_addstrm *addstrm;
1056                 __u16 number;
1057
1058                 addstrm = (struct sctp_strreset_addstrm *)req;
1059                 nums = ntohs(addstrm->number_of_streams);
1060                 number = stream->outcnt - nums;
1061
1062                 if (result == SCTP_STRRESET_PERFORMED)
1063                         for (i = number; i < stream->outcnt; i++)
1064                                 stream->out[i].state = SCTP_STREAM_OPEN;
1065                 else
1066                         stream->outcnt = number;
1067
1068                 *evp = sctp_ulpevent_make_stream_change_event(asoc, flags,
1069                         0, nums, GFP_ATOMIC);
1070         } else if (req->type == SCTP_PARAM_RESET_ADD_IN_STREAMS) {
1071                 struct sctp_strreset_addstrm *addstrm;
1072
1073                 /* if the result is performed, it's impossible for addstrm in
1074                  * request.
1075                  */
1076                 if (result == SCTP_STRRESET_PERFORMED)
1077                         return NULL;
1078
1079                 addstrm = (struct sctp_strreset_addstrm *)req;
1080                 nums = ntohs(addstrm->number_of_streams);
1081
1082                 *evp = sctp_ulpevent_make_stream_change_event(asoc, flags,
1083                         nums, 0, GFP_ATOMIC);
1084         }
1085
1086         asoc->strreset_outstanding--;
1087         asoc->strreset_outseq++;
1088
1089         /* remove everything for this reconf request */
1090         if (!asoc->strreset_outstanding) {
1091                 t = asoc->strreset_chunk->transport;
1092                 if (del_timer(&t->reconf_timer))
1093                         sctp_transport_put(t);
1094
1095                 sctp_chunk_put(asoc->strreset_chunk);
1096                 asoc->strreset_chunk = NULL;
1097         }
1098
1099         return NULL;
1100 }