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         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 static bool sctp_stream_outq_is_empty(struct sctp_stream *stream,
 258                                       __u16 str_nums, __be16 *str_list)
 259 {
 260         struct sctp_association *asoc;
 261         __u16 i;
 262
 263         asoc = container_of(stream, struct sctp_association, stream);
 264         if (!asoc->outqueue.out_qlen)
 265                 return true;
 266
 267         if (!str_nums)
 268                 return false;
 269
 270         for (i = 0; i < str_nums; i++) {
 271                 __u16 sid = ntohs(str_list[i]);
 272
 273                 if (stream->out[sid].ext &&
 274                     !list_empty(&stream->out[sid].ext->outq))
 275                         return false;
 276         }
 277
 278         return true;
 279 }
 280
 281 int sctp_send_reset_streams(struct sctp_association *asoc,
 282                             struct sctp_reset_streams *params)
 283 {
 284         struct sctp_stream *stream = &asoc->stream;
 285         __u16 i, str_nums, *str_list;
 286         struct sctp_chunk *chunk;
 287         int retval = -EINVAL;
 288         __be16 *nstr_list;
 289         bool out, in;
 290
 291         if (!asoc->peer.reconf_capable ||
 292             !(asoc->strreset_enable & SCTP_ENABLE_RESET_STREAM_REQ)) {
 293                 retval = -ENOPROTOOPT;
 294                 goto out;
 295         }
 296
 297         if (asoc->strreset_outstanding) {
 298                 retval = -EINPROGRESS;
 299                 goto out;
 300         }
 301
 302         out = params->srs_flags & SCTP_STREAM_RESET_OUTGOING;
 303         in  = params->srs_flags & SCTP_STREAM_RESET_INCOMING;
 304         if (!out && !in)
 305                 goto out;
 306
 307         str_nums = params->srs_number_streams;
 308         str_list = params->srs_stream_list;
 309         if (str_nums) {
 310                 int param_len = 0;
 311
 312                 if (out) {
 313                         for (i = 0; i < str_nums; i++)
 314                                 if (str_list[i] >= stream->outcnt)
 315                                         goto out;
 316
 317                         param_len = str_nums * sizeof(__u16) +
 318                                     sizeof(struct sctp_strreset_outreq);
 319                 }
 320
 321                 if (in) {
 322                         for (i = 0; i < str_nums; i++)
 323                                 if (str_list[i] >= stream->incnt)
 324                                         goto out;
 325
 326                         param_len += str_nums * sizeof(__u16) +
 327                                      sizeof(struct sctp_strreset_inreq);
 328                 }
 329
 330                 if (param_len > SCTP_MAX_CHUNK_LEN -
 331                                 sizeof(struct sctp_reconf_chunk))
 332                         goto out;
 333         }
 334
 335         nstr_list = kcalloc(str_nums, sizeof(__be16), GFP_KERNEL);
 336         if (!nstr_list) {
 337                 retval = -ENOMEM;
 338                 goto out;
 339         }
 340
 341         for (i = 0; i < str_nums; i++)
 342                 nstr_list[i] = htons(str_list[i]);
 343
 344         if (out && !sctp_stream_outq_is_empty(stream, str_nums, nstr_list)) {
 345                 retval = -EAGAIN;
 346                 goto out;
 347         }
 348
 349         chunk = sctp_make_strreset_req(asoc, str_nums, nstr_list, out, in);
 350
 351         kfree(nstr_list);
 352
 353         if (!chunk) {
 354                 retval = -ENOMEM;
 355                 goto out;
 356         }
 357
 358         if (out) {
 359                 if (str_nums)
 360                         for (i = 0; i < str_nums; i++)
 361                                 stream->out[str_list[i]].state =
 362                                                        SCTP_STREAM_CLOSED;
 363                 else
 364                         for (i = 0; i < stream->outcnt; i++)
 365                                 stream->out[i].state = SCTP_STREAM_CLOSED;
 366         }
 367
 368         asoc->strreset_chunk = chunk;
 369         sctp_chunk_hold(asoc->strreset_chunk);
 370
 371         retval = sctp_send_reconf(asoc, chunk);
 372         if (retval) {
 373                 sctp_chunk_put(asoc->strreset_chunk);
 374                 asoc->strreset_chunk = NULL;
 375                 if (!out)
 376                         goto out;
 377
 378                 if (str_nums)
 379                         for (i = 0; i < str_nums; i++)
 380                                 stream->out[str_list[i]].state =
 381                                                        SCTP_STREAM_OPEN;
 382                 else
 383                         for (i = 0; i < stream->outcnt; i++)
 384                                 stream->out[i].state = SCTP_STREAM_OPEN;
 385
 386                 goto out;
 387         }
 388
 389         asoc->strreset_outstanding = out + in;
 390
 391 out:
 392         return retval;
 393 }
 394
 395 int sctp_send_reset_assoc(struct sctp_association *asoc)
 396 {
 397         struct sctp_stream *stream = &asoc->stream;
 398         struct sctp_chunk *chunk = NULL;
 399         int retval;
 400         __u16 i;
 401
 402         if (!asoc->peer.reconf_capable ||
 403             !(asoc->strreset_enable & SCTP_ENABLE_RESET_ASSOC_REQ))
 404                 return -ENOPROTOOPT;
 405
 406         if (asoc->strreset_outstanding)
 407                 return -EINPROGRESS;
 408
 409         if (!sctp_outq_is_empty(&asoc->outqueue))
 410                 return -EAGAIN;
 411
 412         chunk = sctp_make_strreset_tsnreq(asoc);
 413         if (!chunk)
 414                 return -ENOMEM;
 415
 416         /* Block further xmit of data until this request is completed */
 417         for (i = 0; i < stream->outcnt; i++)
 418                 stream->out[i].state = SCTP_STREAM_CLOSED;
 419
 420         asoc->strreset_chunk = chunk;
 421         sctp_chunk_hold(asoc->strreset_chunk);
 422
 423         retval = sctp_send_reconf(asoc, chunk);
 424         if (retval) {
 425                 sctp_chunk_put(asoc->strreset_chunk);
 426                 asoc->strreset_chunk = NULL;
 427
 428                 for (i = 0; i < stream->outcnt; i++)
 429                         stream->out[i].state = SCTP_STREAM_OPEN;
 430
 431                 return retval;
 432         }
 433
 434         asoc->strreset_outstanding = 1;
 435
 436         return 0;
 437 }
 438
 439 int sctp_send_add_streams(struct sctp_association *asoc,
 440                           struct sctp_add_streams *params)
 441 {
 442         struct sctp_stream *stream = &asoc->stream;
 443         struct sctp_chunk *chunk = NULL;
 444         int retval;
 445         __u32 outcnt, incnt;
 446         __u16 out, in;
 447
 448         if (!asoc->peer.reconf_capable ||
 449             !(asoc->strreset_enable & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
 450                 retval = -ENOPROTOOPT;
 451                 goto out;
 452         }
 453
 454         if (asoc->strreset_outstanding) {
 455                 retval = -EINPROGRESS;
 456                 goto out;
 457         }
 458
 459         out = params->sas_outstrms;
 460         in  = params->sas_instrms;
 461         outcnt = stream->outcnt + out;
 462         incnt = stream->incnt + in;
 463         if (outcnt > SCTP_MAX_STREAM || incnt > SCTP_MAX_STREAM ||
 464             (!out && !in)) {
 465                 retval = -EINVAL;
 466                 goto out;
 467         }
 468
 469         if (out) {
 470                 retval = sctp_stream_alloc_out(stream, outcnt, GFP_KERNEL);
 471                 if (retval)
 472                         goto out;
 473         }
 474
 475         chunk = sctp_make_strreset_addstrm(asoc, out, in);
 476         if (!chunk) {
 477                 retval = -ENOMEM;
 478                 goto out;
 479         }
 480
 481         asoc->strreset_chunk = chunk;
 482         sctp_chunk_hold(asoc->strreset_chunk);
 483
 484         retval = sctp_send_reconf(asoc, chunk);
 485         if (retval) {
 486                 sctp_chunk_put(asoc->strreset_chunk);
 487                 asoc->strreset_chunk = NULL;
 488                 goto out;
 489         }
 490
 491         stream->incnt = incnt;
 492         stream->outcnt = outcnt;
 493
 494         asoc->strreset_outstanding = !!out + !!in;
 495
 496 out:
 497         return retval;
 498 }
 499
 500 static struct sctp_paramhdr *sctp_chunk_lookup_strreset_param(
 501                         struct sctp_association *asoc, __be32 resp_seq,
 502                         __be16 type)
 503 {
 504         struct sctp_chunk *chunk = asoc->strreset_chunk;
 505         struct sctp_reconf_chunk *hdr;
 506         union sctp_params param;
 507
 508         if (!chunk)
 509                 return NULL;
 510
 511         hdr = (struct sctp_reconf_chunk *)chunk->chunk_hdr;
 512         sctp_walk_params(param, hdr, params) {
 513                 /* sctp_strreset_tsnreq is actually the basic structure
 514                  * of all stream reconf params, so it's safe to use it
 515                  * to access request_seq.
 516                  */
 517                 struct sctp_strreset_tsnreq *req = param.v;
 518
 519                 if ((!resp_seq || req->request_seq == resp_seq) &&
 520                     (!type || type == req->param_hdr.type))
 521                         return param.v;
 522         }
 523
 524         return NULL;
 525 }
 526
 527 static void sctp_update_strreset_result(struct sctp_association *asoc,
 528                                         __u32 result)
 529 {
 530         asoc->strreset_result[1] = asoc->strreset_result[0];
 531         asoc->strreset_result[0] = result;
 532 }
 533
 534 struct sctp_chunk *sctp_process_strreset_outreq(
 535                                 struct sctp_association *asoc,
 536                                 union sctp_params param,
 537                                 struct sctp_ulpevent **evp)
 538 {
 539         struct sctp_strreset_outreq *outreq = param.v;
 540         struct sctp_stream *stream = &asoc->stream;
 541         __u32 result = SCTP_STRRESET_DENIED;
 542         __u16 i, nums, flags = 0;
 543         __be16 *str_p = NULL;
 544         __u32 request_seq;
 545
 546         request_seq = ntohl(outreq->request_seq);
 547
 548         if (ntohl(outreq->send_reset_at_tsn) >
 549             sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map)) {
 550                 result = SCTP_STRRESET_IN_PROGRESS;
 551                 goto err;
 552         }
 553
 554         if (TSN_lt(asoc->strreset_inseq, request_seq) ||
 555             TSN_lt(request_seq, asoc->strreset_inseq - 2)) {
 556                 result = SCTP_STRRESET_ERR_BAD_SEQNO;
 557                 goto err;
 558         } else if (TSN_lt(request_seq, asoc->strreset_inseq)) {
 559                 i = asoc->strreset_inseq - request_seq - 1;
 560                 result = asoc->strreset_result[i];
 561                 goto err;
 562         }
 563         asoc->strreset_inseq++;
 564
 565         /* Check strreset_enable after inseq inc, as sender cannot tell
 566          * the peer doesn't enable strreset after receiving response with
 567          * result denied, as well as to keep consistent with bsd.
 568          */
 569         if (!(asoc->strreset_enable & SCTP_ENABLE_RESET_STREAM_REQ))
 570                 goto out;
 571
 572         if (asoc->strreset_chunk) {
 573                 if (!sctp_chunk_lookup_strreset_param(
 574                                 asoc, outreq->response_seq,
 575                                 SCTP_PARAM_RESET_IN_REQUEST)) {
 576                         /* same process with outstanding isn't 0 */
 577                         result = SCTP_STRRESET_ERR_IN_PROGRESS;
 578                         goto out;
 579                 }
 580
 581                 asoc->strreset_outstanding--;
 582                 asoc->strreset_outseq++;
 583
 584                 if (!asoc->strreset_outstanding) {
 585                         struct sctp_transport *t;
 586
 587                         t = asoc->strreset_chunk->transport;
 588                         if (del_timer(&t->reconf_timer))
 589                                 sctp_transport_put(t);
 590
 591                         sctp_chunk_put(asoc->strreset_chunk);
 592                         asoc->strreset_chunk = NULL;
 593                 }
 594
 595                 flags = SCTP_STREAM_RESET_INCOMING_SSN;
 596         }
 597
 598         nums = (ntohs(param.p->length) - sizeof(*outreq)) / sizeof(__u16);
 599         if (nums) {
 600                 str_p = outreq->list_of_streams;
 601                 for (i = 0; i < nums; i++) {
 602                         if (ntohs(str_p[i]) >= stream->incnt) {
 603                                 result = SCTP_STRRESET_ERR_WRONG_SSN;
 604                                 goto out;
 605                         }
 606                 }
 607
 608                 for (i = 0; i < nums; i++)
 609                         stream->in[ntohs(str_p[i])].ssn = 0;
 610         } else {
 611                 for (i = 0; i < stream->incnt; i++)
 612                         stream->in[i].ssn = 0;
 613         }
 614
 615         result = SCTP_STRRESET_PERFORMED;
 616
 617         *evp = sctp_ulpevent_make_stream_reset_event(asoc,
 618                 flags | SCTP_STREAM_RESET_OUTGOING_SSN, nums, str_p,
 619                 GFP_ATOMIC);
 620
 621 out:
 622         sctp_update_strreset_result(asoc, result);
 623 err:
 624         return sctp_make_strreset_resp(asoc, result, request_seq);
 625 }
 626
 627 struct sctp_chunk *sctp_process_strreset_inreq(
 628                                 struct sctp_association *asoc,
 629                                 union sctp_params param,
 630                                 struct sctp_ulpevent **evp)
 631 {
 632         struct sctp_strreset_inreq *inreq = param.v;
 633         struct sctp_stream *stream = &asoc->stream;
 634         __u32 result = SCTP_STRRESET_DENIED;
 635         struct sctp_chunk *chunk = NULL;
 636         __u32 request_seq;
 637         __u16 i, nums;
 638         __be16 *str_p;
 639
 640         request_seq = ntohl(inreq->request_seq);
 641         if (TSN_lt(asoc->strreset_inseq, request_seq) ||
 642             TSN_lt(request_seq, asoc->strreset_inseq - 2)) {
 643                 result = SCTP_STRRESET_ERR_BAD_SEQNO;
 644                 goto err;
 645         } else if (TSN_lt(request_seq, asoc->strreset_inseq)) {
 646                 i = asoc->strreset_inseq - request_seq - 1;
 647                 result = asoc->strreset_result[i];
 648                 if (result == SCTP_STRRESET_PERFORMED)
 649                         return NULL;
 650                 goto err;
 651         }
 652         asoc->strreset_inseq++;
 653
 654         if (!(asoc->strreset_enable & SCTP_ENABLE_RESET_STREAM_REQ))
 655                 goto out;
 656
 657         if (asoc->strreset_outstanding) {
 658                 result = SCTP_STRRESET_ERR_IN_PROGRESS;
 659                 goto out;
 660         }
 661
 662         nums = (ntohs(param.p->length) - sizeof(*inreq)) / sizeof(__u16);
 663         str_p = inreq->list_of_streams;
 664         for (i = 0; i < nums; i++) {
 665                 if (ntohs(str_p[i]) >= stream->outcnt) {
 666                         result = SCTP_STRRESET_ERR_WRONG_SSN;
 667                         goto out;
 668                 }
 669         }
 670
 671         if (!sctp_stream_outq_is_empty(stream, nums, str_p)) {
 672                 result = SCTP_STRRESET_IN_PROGRESS;
 673                 asoc->strreset_inseq--;
 674                 goto err;
 675         }
 676
 677         chunk = sctp_make_strreset_req(asoc, nums, str_p, 1, 0);
 678         if (!chunk)
 679                 goto out;
 680
 681         if (nums)
 682                 for (i = 0; i < nums; i++)
 683                         stream->out[ntohs(str_p[i])].state =
 684                                                SCTP_STREAM_CLOSED;
 685         else
 686                 for (i = 0; i < stream->outcnt; i++)
 687                         stream->out[i].state = SCTP_STREAM_CLOSED;
 688
 689         asoc->strreset_chunk = chunk;
 690         asoc->strreset_outstanding = 1;
 691         sctp_chunk_hold(asoc->strreset_chunk);
 692
 693         result = SCTP_STRRESET_PERFORMED;
 694
 695         *evp = sctp_ulpevent_make_stream_reset_event(asoc,
 696                 SCTP_STREAM_RESET_INCOMING_SSN, nums, str_p, GFP_ATOMIC);
 697
 698 out:
 699         sctp_update_strreset_result(asoc, result);
 700 err:
 701         if (!chunk)
 702                 chunk =  sctp_make_strreset_resp(asoc, result, request_seq);
 703
 704         return chunk;
 705 }
 706
 707 struct sctp_chunk *sctp_process_strreset_tsnreq(
 708                                 struct sctp_association *asoc,
 709                                 union sctp_params param,
 710                                 struct sctp_ulpevent **evp)
 711 {
 712         __u32 init_tsn = 0, next_tsn = 0, max_tsn_seen;
 713         struct sctp_strreset_tsnreq *tsnreq = param.v;
 714         struct sctp_stream *stream = &asoc->stream;
 715         __u32 result = SCTP_STRRESET_DENIED;
 716         __u32 request_seq;
 717         __u16 i;
 718
 719         request_seq = ntohl(tsnreq->request_seq);
 720         if (TSN_lt(asoc->strreset_inseq, request_seq) ||
 721             TSN_lt(request_seq, asoc->strreset_inseq - 2)) {
 722                 result = SCTP_STRRESET_ERR_BAD_SEQNO;
 723                 goto err;
 724         } else if (TSN_lt(request_seq, asoc->strreset_inseq)) {
 725                 i = asoc->strreset_inseq - request_seq - 1;
 726                 result = asoc->strreset_result[i];
 727                 if (result == SCTP_STRRESET_PERFORMED) {
 728                         next_tsn = asoc->ctsn_ack_point + 1;
 729                         init_tsn =
 730                                 sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map) + 1;
 731                 }
 732                 goto err;
 733         }
 734
 735         if (!sctp_outq_is_empty(&asoc->outqueue)) {
 736                 result = SCTP_STRRESET_IN_PROGRESS;
 737                 goto err;
 738         }
 739
 740         asoc->strreset_inseq++;
 741
 742         if (!(asoc->strreset_enable & SCTP_ENABLE_RESET_ASSOC_REQ))
 743                 goto out;
 744
 745         if (asoc->strreset_outstanding) {
 746                 result = SCTP_STRRESET_ERR_IN_PROGRESS;
 747                 goto out;
 748         }
 749
 750         /* G4: The same processing as though a FWD-TSN chunk (as defined in
 751          *     [RFC3758]) with all streams affected and a new cumulative TSN
 752          *     ACK of the Receiver's Next TSN minus 1 were received MUST be
 753          *     performed.
 754          */
 755         max_tsn_seen = sctp_tsnmap_get_max_tsn_seen(&asoc->peer.tsn_map);
 756         sctp_ulpq_reasm_flushtsn(&asoc->ulpq, max_tsn_seen);
 757         sctp_ulpq_abort_pd(&asoc->ulpq, GFP_ATOMIC);
 758
 759         /* G1: Compute an appropriate value for the Receiver's Next TSN -- the
 760          *     TSN that the peer should use to send the next DATA chunk.  The
 761          *     value SHOULD be the smallest TSN not acknowledged by the
 762          *     receiver of the request plus 2^31.
 763          */
 764         init_tsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map) + (1 << 31);
 765         sctp_tsnmap_init(&asoc->peer.tsn_map, SCTP_TSN_MAP_INITIAL,
 766                          init_tsn, GFP_ATOMIC);
 767
 768         /* G3: The same processing as though a SACK chunk with no gap report
 769          *     and a cumulative TSN ACK of the Sender's Next TSN minus 1 were
 770          *     received MUST be performed.
 771          */
 772         sctp_outq_free(&asoc->outqueue);
 773
 774         /* G2: Compute an appropriate value for the local endpoint's next TSN,
 775          *     i.e., the next TSN assigned by the receiver of the SSN/TSN reset
 776          *     chunk.  The value SHOULD be the highest TSN sent by the receiver
 777          *     of the request plus 1.
 778          */
 779         next_tsn = asoc->next_tsn;
 780         asoc->ctsn_ack_point = next_tsn - 1;
 781         asoc->adv_peer_ack_point = asoc->ctsn_ack_point;
 782
 783         /* G5:  The next expected and outgoing SSNs MUST be reset to 0 for all
 784          *      incoming and outgoing streams.
 785          */
 786         for (i = 0; i < stream->outcnt; i++)
 787                 stream->out[i].ssn = 0;
 788         for (i = 0; i < stream->incnt; i++)
 789                 stream->in[i].ssn = 0;
 790
 791         result = SCTP_STRRESET_PERFORMED;
 792
 793         *evp = sctp_ulpevent_make_assoc_reset_event(asoc, 0, init_tsn,
 794                                                     next_tsn, GFP_ATOMIC);
 795
 796 out:
 797         sctp_update_strreset_result(asoc, result);
 798 err:
 799         return sctp_make_strreset_tsnresp(asoc, result, request_seq,
 800                                           next_tsn, init_tsn);
 801 }
 802
 803 struct sctp_chunk *sctp_process_strreset_addstrm_out(
 804                                 struct sctp_association *asoc,
 805                                 union sctp_params param,
 806                                 struct sctp_ulpevent **evp)
 807 {
 808         struct sctp_strreset_addstrm *addstrm = param.v;
 809         struct sctp_stream *stream = &asoc->stream;
 810         __u32 result = SCTP_STRRESET_DENIED;
 811         __u32 request_seq, incnt;
 812         __u16 in, i;
 813
 814         request_seq = ntohl(addstrm->request_seq);
 815         if (TSN_lt(asoc->strreset_inseq, request_seq) ||
 816             TSN_lt(request_seq, asoc->strreset_inseq - 2)) {
 817                 result = SCTP_STRRESET_ERR_BAD_SEQNO;
 818                 goto err;
 819         } else if (TSN_lt(request_seq, asoc->strreset_inseq)) {
 820                 i = asoc->strreset_inseq - request_seq - 1;
 821                 result = asoc->strreset_result[i];
 822                 goto err;
 823         }
 824         asoc->strreset_inseq++;
 825
 826         if (!(asoc->strreset_enable & SCTP_ENABLE_CHANGE_ASSOC_REQ))
 827                 goto out;
 828
 829         if (asoc->strreset_chunk) {
 830                 if (!sctp_chunk_lookup_strreset_param(
 831                         asoc, 0, SCTP_PARAM_RESET_ADD_IN_STREAMS)) {
 832                         /* same process with outstanding isn't 0 */
 833                         result = SCTP_STRRESET_ERR_IN_PROGRESS;
 834                         goto out;
 835                 }
 836
 837                 asoc->strreset_outstanding--;
 838                 asoc->strreset_outseq++;
 839
 840                 if (!asoc->strreset_outstanding) {
 841                         struct sctp_transport *t;
 842
 843                         t = asoc->strreset_chunk->transport;
 844                         if (del_timer(&t->reconf_timer))
 845                                 sctp_transport_put(t);
 846
 847                         sctp_chunk_put(asoc->strreset_chunk);
 848                         asoc->strreset_chunk = NULL;
 849                 }
 850         }
 851
 852         in = ntohs(addstrm->number_of_streams);
 853         incnt = stream->incnt + in;
 854         if (!in || incnt > SCTP_MAX_STREAM)
 855                 goto out;
 856
 857         if (sctp_stream_alloc_in(stream, incnt, GFP_ATOMIC))
 858                 goto out;
 859
 860         stream->incnt = incnt;
 861
 862         result = SCTP_STRRESET_PERFORMED;
 863
 864         *evp = sctp_ulpevent_make_stream_change_event(asoc,
 865                 0, ntohs(addstrm->number_of_streams), 0, GFP_ATOMIC);
 866
 867 out:
 868         sctp_update_strreset_result(asoc, result);
 869 err:
 870         return sctp_make_strreset_resp(asoc, result, request_seq);
 871 }
 872
 873 struct sctp_chunk *sctp_process_strreset_addstrm_in(
 874                                 struct sctp_association *asoc,
 875                                 union sctp_params param,
 876                                 struct sctp_ulpevent **evp)
 877 {
 878         struct sctp_strreset_addstrm *addstrm = param.v;
 879         struct sctp_stream *stream = &asoc->stream;
 880         __u32 result = SCTP_STRRESET_DENIED;
 881         struct sctp_chunk *chunk = NULL;
 882         __u32 request_seq, outcnt;
 883         __u16 out, i;
 884         int ret;
 885
 886         request_seq = ntohl(addstrm->request_seq);
 887         if (TSN_lt(asoc->strreset_inseq, request_seq) ||
 888             TSN_lt(request_seq, asoc->strreset_inseq - 2)) {
 889                 result = SCTP_STRRESET_ERR_BAD_SEQNO;
 890                 goto err;
 891         } else if (TSN_lt(request_seq, asoc->strreset_inseq)) {
 892                 i = asoc->strreset_inseq - request_seq - 1;
 893                 result = asoc->strreset_result[i];
 894                 if (result == SCTP_STRRESET_PERFORMED)
 895                         return NULL;
 896                 goto err;
 897         }
 898         asoc->strreset_inseq++;
 899
 900         if (!(asoc->strreset_enable & SCTP_ENABLE_CHANGE_ASSOC_REQ))
 901                 goto out;
 902
 903         if (asoc->strreset_outstanding) {
 904                 result = SCTP_STRRESET_ERR_IN_PROGRESS;
 905                 goto out;
 906         }
 907
 908         out = ntohs(addstrm->number_of_streams);
 909         outcnt = stream->outcnt + out;
 910         if (!out || outcnt > SCTP_MAX_STREAM)
 911                 goto out;
 912
 913         ret = sctp_stream_alloc_out(stream, outcnt, GFP_ATOMIC);
 914         if (ret)
 915                 goto out;
 916
 917         chunk = sctp_make_strreset_addstrm(asoc, out, 0);
 918         if (!chunk)
 919                 goto out;
 920
 921         asoc->strreset_chunk = chunk;
 922         asoc->strreset_outstanding = 1;
 923         sctp_chunk_hold(asoc->strreset_chunk);
 924
 925         stream->outcnt = outcnt;
 926
 927         result = SCTP_STRRESET_PERFORMED;
 928
 929         *evp = sctp_ulpevent_make_stream_change_event(asoc,
 930                 0, 0, ntohs(addstrm->number_of_streams), GFP_ATOMIC);
 931
 932 out:
 933         sctp_update_strreset_result(asoc, result);
 934 err:
 935         if (!chunk)
 936                 chunk = sctp_make_strreset_resp(asoc, result, request_seq);
 937
 938         return chunk;
 939 }
 940
 941 struct sctp_chunk *sctp_process_strreset_resp(
 942                                 struct sctp_association *asoc,
 943                                 union sctp_params param,
 944                                 struct sctp_ulpevent **evp)
 945 {
 946         struct sctp_stream *stream = &asoc->stream;
 947         struct sctp_strreset_resp *resp = param.v;
 948         struct sctp_transport *t;
 949         __u16 i, nums, flags = 0;
 950         struct sctp_paramhdr *req;
 951         __u32 result;
 952
 953         req = sctp_chunk_lookup_strreset_param(asoc, resp->response_seq, 0);
 954         if (!req)
 955                 return NULL;
 956
 957         result = ntohl(resp->result);
 958         if (result != SCTP_STRRESET_PERFORMED) {
 959                 /* if in progress, do nothing but retransmit */
 960                 if (result == SCTP_STRRESET_IN_PROGRESS)
 961                         return NULL;
 962                 else if (result == SCTP_STRRESET_DENIED)
 963                         flags = SCTP_STREAM_RESET_DENIED;
 964                 else
 965                         flags = SCTP_STREAM_RESET_FAILED;
 966         }
 967
 968         if (req->type == SCTP_PARAM_RESET_OUT_REQUEST) {
 969                 struct sctp_strreset_outreq *outreq;
 970                 __be16 *str_p;
 971
 972                 outreq = (struct sctp_strreset_outreq *)req;
 973                 str_p = outreq->list_of_streams;
 974                 nums = (ntohs(outreq->param_hdr.length) - sizeof(*outreq)) /
 975                        sizeof(__u16);
 976
 977                 if (result == SCTP_STRRESET_PERFORMED) {
 978                         if (nums) {
 979                                 for (i = 0; i < nums; i++)
 980                                         stream->out[ntohs(str_p[i])].ssn = 0;
 981                         } else {
 982                                 for (i = 0; i < stream->outcnt; i++)
 983                                         stream->out[i].ssn = 0;
 984                         }
 985
 986                         flags = SCTP_STREAM_RESET_OUTGOING_SSN;
 987                 }
 988
 989                 for (i = 0; i < stream->outcnt; i++)
 990                         stream->out[i].state = SCTP_STREAM_OPEN;
 991
 992                 *evp = sctp_ulpevent_make_stream_reset_event(asoc, flags,
 993                         nums, str_p, GFP_ATOMIC);
 994         } else if (req->type == SCTP_PARAM_RESET_IN_REQUEST) {
 995                 struct sctp_strreset_inreq *inreq;
 996                 __be16 *str_p;
 997
 998                 /* if the result is performed, it's impossible for inreq */
 999                 if (result == SCTP_STRRESET_PERFORMED)
1000                         return NULL;
1001
1002                 inreq = (struct sctp_strreset_inreq *)req;
1003                 str_p = inreq->list_of_streams;
1004                 nums = (ntohs(inreq->param_hdr.length) - sizeof(*inreq)) /
1005                        sizeof(__u16);
1006
1007                 *evp = sctp_ulpevent_make_stream_reset_event(asoc, flags,
1008                         nums, str_p, GFP_ATOMIC);
1009         } else if (req->type == SCTP_PARAM_RESET_TSN_REQUEST) {
1010                 struct sctp_strreset_resptsn *resptsn;
1011                 __u32 stsn, rtsn;
1012
1013                 /* check for resptsn, as sctp_verify_reconf didn't do it*/
1014                 if (ntohs(param.p->length) != sizeof(*resptsn))
1015                         return NULL;
1016
1017                 resptsn = (struct sctp_strreset_resptsn *)resp;
1018                 stsn = ntohl(resptsn->senders_next_tsn);
1019                 rtsn = ntohl(resptsn->receivers_next_tsn);
1020
1021                 if (result == SCTP_STRRESET_PERFORMED) {
1022                         __u32 mtsn = sctp_tsnmap_get_max_tsn_seen(
1023                                                 &asoc->peer.tsn_map);
1024                         LIST_HEAD(temp);
1025
1026                         sctp_ulpq_reasm_flushtsn(&asoc->ulpq, mtsn);
1027                         sctp_ulpq_abort_pd(&asoc->ulpq, GFP_ATOMIC);
1028
1029                         sctp_tsnmap_init(&asoc->peer.tsn_map,
1030                                          SCTP_TSN_MAP_INITIAL,
1031                                          stsn, GFP_ATOMIC);
1032
1033                         /* Clean up sacked and abandoned queues only. As the
1034                          * out_chunk_list may not be empty, splice it to temp,
1035                          * then get it back after sctp_outq_free is done.
1036                          */
1037                         list_splice_init(&asoc->outqueue.out_chunk_list, &temp);
1038                         sctp_outq_free(&asoc->outqueue);
1039                         list_splice_init(&temp, &asoc->outqueue.out_chunk_list);
1040
1041                         asoc->next_tsn = rtsn;
1042                         asoc->ctsn_ack_point = asoc->next_tsn - 1;
1043                         asoc->adv_peer_ack_point = asoc->ctsn_ack_point;
1044
1045                         for (i = 0; i < stream->outcnt; i++)
1046                                 stream->out[i].ssn = 0;
1047                         for (i = 0; i < stream->incnt; i++)
1048                                 stream->in[i].ssn = 0;
1049                 }
1050
1051                 for (i = 0; i < stream->outcnt; i++)
1052                         stream->out[i].state = SCTP_STREAM_OPEN;
1053
1054                 *evp = sctp_ulpevent_make_assoc_reset_event(asoc, flags,
1055                         stsn, rtsn, GFP_ATOMIC);
1056         } else if (req->type == SCTP_PARAM_RESET_ADD_OUT_STREAMS) {
1057                 struct sctp_strreset_addstrm *addstrm;
1058                 __u16 number;
1059
1060                 addstrm = (struct sctp_strreset_addstrm *)req;
1061                 nums = ntohs(addstrm->number_of_streams);
1062                 number = stream->outcnt - nums;
1063
1064                 if (result == SCTP_STRRESET_PERFORMED)
1065                         for (i = number; i < stream->outcnt; i++)
1066                                 stream->out[i].state = SCTP_STREAM_OPEN;
1067                 else
1068                         stream->outcnt = number;
1069
1070                 *evp = sctp_ulpevent_make_stream_change_event(asoc, flags,
1071                         0, nums, GFP_ATOMIC);
1072         } else if (req->type == SCTP_PARAM_RESET_ADD_IN_STREAMS) {
1073                 struct sctp_strreset_addstrm *addstrm;
1074
1075                 /* if the result is performed, it's impossible for addstrm in
1076                  * request.
1077                  */
1078                 if (result == SCTP_STRRESET_PERFORMED)
1079                         return NULL;
1080
1081                 addstrm = (struct sctp_strreset_addstrm *)req;
1082                 nums = ntohs(addstrm->number_of_streams);
1083
1084                 *evp = sctp_ulpevent_make_stream_change_event(asoc, flags,
1085                         nums, 0, GFP_ATOMIC);
1086         }
1087
1088         asoc->strreset_outstanding--;
1089         asoc->strreset_outseq++;
1090
1091         /* remove everything for this reconf request */
1092         if (!asoc->strreset_outstanding) {
1093                 t = asoc->strreset_chunk->transport;
1094                 if (del_timer(&t->reconf_timer))
1095                         sctp_transport_put(t);
1096
1097                 sctp_chunk_put(asoc->strreset_chunk);
1098                 asoc->strreset_chunk = NULL;
1099         }
1100
1101         return NULL;
1102 }