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  * This file contains sctp stream maniuplation primitives and helpers.
  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         sctp_stream_interleave_init(stream);
 171         if (!incnt)
 172                 goto out;
 173
 174         ret = sctp_stream_alloc_in(stream, incnt, gfp);
 175         if (ret) {
 176                 sched->free(stream);
 177                 kfree(stream->out);
 178                 stream->out = NULL;
 179                 stream->outcnt = 0;
 180                 goto out;
 181         }
 182
 183         stream->incnt = incnt;
 184
 185 out:
 186         return ret;
 187 }
 188
 189 int sctp_stream_init_ext(struct sctp_stream *stream, __u16 sid)
 190 {
 191         struct sctp_stream_out_ext *soute;
 192
 193         soute = kzalloc(sizeof(*soute), GFP_KERNEL);
 194         if (!soute)
 195                 return -ENOMEM;
 196         stream->out[sid].ext = soute;
 197
 198         return sctp_sched_init_sid(stream, sid, GFP_KERNEL);
 199 }
 200
 201 void sctp_stream_free(struct sctp_stream *stream)
 202 {
 203         struct sctp_sched_ops *sched = sctp_sched_ops_from_stream(stream);
 204         int i;
 205
 206         sched->free(stream);
 207         for (i = 0; i < stream->outcnt; i++)
 208                 kfree(stream->out[i].ext);
 209         kfree(stream->out);
 210         kfree(stream->in);
 211 }
 212
 213 void sctp_stream_clear(struct sctp_stream *stream)
 214 {
 215         int i;
 216
 217         for (i = 0; i < stream->outcnt; i++) {
 218                 stream->out[i].mid = 0;
 219                 stream->out[i].mid_uo = 0;
 220         }
 221
 222         for (i = 0; i < stream->incnt; i++)
 223                 stream->in[i].mid = 0;
 224 }
 225
 226 void sctp_stream_update(struct sctp_stream *stream, struct sctp_stream *new)
 227 {
 228         struct sctp_sched_ops *sched = sctp_sched_ops_from_stream(stream);
 229
 230         sched->unsched_all(stream);
 231         sctp_stream_outq_migrate(stream, new, new->outcnt);
 232         sctp_stream_free(stream);
 233
 234         stream->out = new->out;
 235         stream->in  = new->in;
 236         stream->outcnt = new->outcnt;
 237         stream->incnt  = new->incnt;
 238
 239         sched->sched_all(stream);
 240
 241         new->out = NULL;
 242         new->in  = NULL;
 243         new->outcnt = 0;
 244         new->incnt  = 0;
 245 }
 246
 247 static int sctp_send_reconf(struct sctp_association *asoc,
 248                             struct sctp_chunk *chunk)
 249 {
 250         struct net *net = sock_net(asoc->base.sk);
 251         int retval = 0;
 252
 253         retval = sctp_primitive_RECONF(net, asoc, chunk);
 254         if (retval)
 255                 sctp_chunk_free(chunk);
 256
 257         return retval;
 258 }
 259
 260 static bool sctp_stream_outq_is_empty(struct sctp_stream *stream,
 261                                       __u16 str_nums, __be16 *str_list)
 262 {
 263         struct sctp_association *asoc;
 264         __u16 i;
 265
 266         asoc = container_of(stream, struct sctp_association, stream);
 267         if (!asoc->outqueue.out_qlen)
 268                 return true;
 269
 270         if (!str_nums)
 271                 return false;
 272
 273         for (i = 0; i < str_nums; i++) {
 274                 __u16 sid = ntohs(str_list[i]);
 275
 276                 if (stream->out[sid].ext &&
 277                     !list_empty(&stream->out[sid].ext->outq))
 278                         return false;
 279         }
 280
 281         return true;
 282 }
 283
 284 int sctp_send_reset_streams(struct sctp_association *asoc,
 285                             struct sctp_reset_streams *params)
 286 {
 287         struct sctp_stream *stream = &asoc->stream;
 288         __u16 i, str_nums, *str_list;
 289         struct sctp_chunk *chunk;
 290         int retval = -EINVAL;
 291         __be16 *nstr_list;
 292         bool out, in;
 293
 294         if (!asoc->peer.reconf_capable ||
 295             !(asoc->strreset_enable & SCTP_ENABLE_RESET_STREAM_REQ)) {
 296                 retval = -ENOPROTOOPT;
 297                 goto out;
 298         }
 299
 300         if (asoc->strreset_outstanding) {
 301                 retval = -EINPROGRESS;
 302                 goto out;
 303         }
 304
 305         out = params->srs_flags & SCTP_STREAM_RESET_OUTGOING;
 306         in  = params->srs_flags & SCTP_STREAM_RESET_INCOMING;
 307         if (!out && !in)
 308                 goto out;
 309
 310         str_nums = params->srs_number_streams;
 311         str_list = params->srs_stream_list;
 312         if (str_nums) {
 313                 int param_len = 0;
 314
 315                 if (out) {
 316                         for (i = 0; i < str_nums; i++)
 317                                 if (str_list[i] >= stream->outcnt)
 318                                         goto out;
 319
 320                         param_len = str_nums * sizeof(__u16) +
 321                                     sizeof(struct sctp_strreset_outreq);
 322                 }
 323
 324                 if (in) {
 325                         for (i = 0; i < str_nums; i++)
 326                                 if (str_list[i] >= stream->incnt)
 327                                         goto out;
 328
 329                         param_len += str_nums * sizeof(__u16) +
 330                                      sizeof(struct sctp_strreset_inreq);
 331                 }
 332
 333                 if (param_len > SCTP_MAX_CHUNK_LEN -
 334                                 sizeof(struct sctp_reconf_chunk))
 335                         goto out;
 336         }
 337
 338         nstr_list = kcalloc(str_nums, sizeof(__be16), GFP_KERNEL);
 339         if (!nstr_list) {
 340                 retval = -ENOMEM;
 341                 goto out;
 342         }
 343
 344         for (i = 0; i < str_nums; i++)
 345                 nstr_list[i] = htons(str_list[i]);
 346
 347         if (out && !sctp_stream_outq_is_empty(stream, str_nums, nstr_list)) {
 348                 retval = -EAGAIN;
 349                 goto out;
 350         }
 351
 352         chunk = sctp_make_strreset_req(asoc, str_nums, nstr_list, out, in);
 353
 354         kfree(nstr_list);
 355
 356         if (!chunk) {
 357                 retval = -ENOMEM;
 358                 goto out;
 359         }
 360
 361         if (out) {
 362                 if (str_nums)
 363                         for (i = 0; i < str_nums; i++)
 364                                 stream->out[str_list[i]].state =
 365                                                        SCTP_STREAM_CLOSED;
 366                 else
 367                         for (i = 0; i < stream->outcnt; i++)
 368                                 stream->out[i].state = SCTP_STREAM_CLOSED;
 369         }
 370
 371         asoc->strreset_chunk = chunk;
 372         sctp_chunk_hold(asoc->strreset_chunk);
 373
 374         retval = sctp_send_reconf(asoc, chunk);
 375         if (retval) {
 376                 sctp_chunk_put(asoc->strreset_chunk);
 377                 asoc->strreset_chunk = NULL;
 378                 if (!out)
 379                         goto out;
 380
 381                 if (str_nums)
 382                         for (i = 0; i < str_nums; i++)
 383                                 stream->out[str_list[i]].state =
 384                                                        SCTP_STREAM_OPEN;
 385                 else
 386                         for (i = 0; i < stream->outcnt; i++)
 387                                 stream->out[i].state = SCTP_STREAM_OPEN;
 388
 389                 goto out;
 390         }
 391
 392         asoc->strreset_outstanding = out + in;
 393
 394 out:
 395         return retval;
 396 }
 397
 398 int sctp_send_reset_assoc(struct sctp_association *asoc)
 399 {
 400         struct sctp_stream *stream = &asoc->stream;
 401         struct sctp_chunk *chunk = NULL;
 402         int retval;
 403         __u16 i;
 404
 405         if (!asoc->peer.reconf_capable ||
 406             !(asoc->strreset_enable & SCTP_ENABLE_RESET_ASSOC_REQ))
 407                 return -ENOPROTOOPT;
 408
 409         if (asoc->strreset_outstanding)
 410                 return -EINPROGRESS;
 411
 412         if (!sctp_outq_is_empty(&asoc->outqueue))
 413                 return -EAGAIN;
 414
 415         chunk = sctp_make_strreset_tsnreq(asoc);
 416         if (!chunk)
 417                 return -ENOMEM;
 418
 419         /* Block further xmit of data until this request is completed */
 420         for (i = 0; i < stream->outcnt; i++)
 421                 stream->out[i].state = SCTP_STREAM_CLOSED;
 422
 423         asoc->strreset_chunk = chunk;
 424         sctp_chunk_hold(asoc->strreset_chunk);
 425
 426         retval = sctp_send_reconf(asoc, chunk);
 427         if (retval) {
 428                 sctp_chunk_put(asoc->strreset_chunk);
 429                 asoc->strreset_chunk = NULL;
 430
 431                 for (i = 0; i < stream->outcnt; i++)
 432                         stream->out[i].state = SCTP_STREAM_OPEN;
 433
 434                 return retval;
 435         }
 436
 437         asoc->strreset_outstanding = 1;
 438
 439         return 0;
 440 }
 441
 442 int sctp_send_add_streams(struct sctp_association *asoc,
 443                           struct sctp_add_streams *params)
 444 {
 445         struct sctp_stream *stream = &asoc->stream;
 446         struct sctp_chunk *chunk = NULL;
 447         int retval;
 448         __u32 outcnt, incnt;
 449         __u16 out, in;
 450
 451         if (!asoc->peer.reconf_capable ||
 452             !(asoc->strreset_enable & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
 453                 retval = -ENOPROTOOPT;
 454                 goto out;
 455         }
 456
 457         if (asoc->strreset_outstanding) {
 458                 retval = -EINPROGRESS;
 459                 goto out;
 460         }
 461
 462         out = params->sas_outstrms;
 463         in  = params->sas_instrms;
 464         outcnt = stream->outcnt + out;
 465         incnt = stream->incnt + in;
 466         if (outcnt > SCTP_MAX_STREAM || incnt > SCTP_MAX_STREAM ||
 467             (!out && !in)) {
 468                 retval = -EINVAL;
 469                 goto out;
 470         }
 471
 472         if (out) {
 473                 retval = sctp_stream_alloc_out(stream, outcnt, GFP_KERNEL);
 474                 if (retval)
 475                         goto out;
 476         }
 477
 478         chunk = sctp_make_strreset_addstrm(asoc, out, in);
 479         if (!chunk) {
 480                 retval = -ENOMEM;
 481                 goto out;
 482         }
 483
 484         asoc->strreset_chunk = chunk;
 485         sctp_chunk_hold(asoc->strreset_chunk);
 486
 487         retval = sctp_send_reconf(asoc, chunk);
 488         if (retval) {
 489                 sctp_chunk_put(asoc->strreset_chunk);
 490                 asoc->strreset_chunk = NULL;
 491                 goto out;
 492         }
 493
 494         stream->incnt = incnt;
 495         stream->outcnt = outcnt;
 496
 497         asoc->strreset_outstanding = !!out + !!in;
 498
 499 out:
 500         return retval;
 501 }
 502
 503 static struct sctp_paramhdr *sctp_chunk_lookup_strreset_param(
 504                         struct sctp_association *asoc, __be32 resp_seq,
 505                         __be16 type)
 506 {
 507         struct sctp_chunk *chunk = asoc->strreset_chunk;
 508         struct sctp_reconf_chunk *hdr;
 509         union sctp_params param;
 510
 511         if (!chunk)
 512                 return NULL;
 513
 514         hdr = (struct sctp_reconf_chunk *)chunk->chunk_hdr;
 515         sctp_walk_params(param, hdr, params) {
 516                 /* sctp_strreset_tsnreq is actually the basic structure
 517                  * of all stream reconf params, so it's safe to use it
 518                  * to access request_seq.
 519                  */
 520                 struct sctp_strreset_tsnreq *req = param.v;
 521
 522                 if ((!resp_seq || req->request_seq == resp_seq) &&
 523                     (!type || type == req->param_hdr.type))
 524                         return param.v;
 525         }
 526
 527         return NULL;
 528 }
 529
 530 static void sctp_update_strreset_result(struct sctp_association *asoc,
 531                                         __u32 result)
 532 {
 533         asoc->strreset_result[1] = asoc->strreset_result[0];
 534         asoc->strreset_result[0] = result;
 535 }
 536
 537 struct sctp_chunk *sctp_process_strreset_outreq(
 538                                 struct sctp_association *asoc,
 539                                 union sctp_params param,
 540                                 struct sctp_ulpevent **evp)
 541 {
 542         struct sctp_strreset_outreq *outreq = param.v;
 543         struct sctp_stream *stream = &asoc->stream;
 544         __u32 result = SCTP_STRRESET_DENIED;
 545         __u16 i, nums, flags = 0;
 546         __be16 *str_p = NULL;
 547         __u32 request_seq;
 548
 549         request_seq = ntohl(outreq->request_seq);
 550
 551         if (ntohl(outreq->send_reset_at_tsn) >
 552             sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map)) {
 553                 result = SCTP_STRRESET_IN_PROGRESS;
 554                 goto err;
 555         }
 556
 557         if (TSN_lt(asoc->strreset_inseq, request_seq) ||
 558             TSN_lt(request_seq, asoc->strreset_inseq - 2)) {
 559                 result = SCTP_STRRESET_ERR_BAD_SEQNO;
 560                 goto err;
 561         } else if (TSN_lt(request_seq, asoc->strreset_inseq)) {
 562                 i = asoc->strreset_inseq - request_seq - 1;
 563                 result = asoc->strreset_result[i];
 564                 goto err;
 565         }
 566         asoc->strreset_inseq++;
 567
 568         /* Check strreset_enable after inseq inc, as sender cannot tell
 569          * the peer doesn't enable strreset after receiving response with
 570          * result denied, as well as to keep consistent with bsd.
 571          */
 572         if (!(asoc->strreset_enable & SCTP_ENABLE_RESET_STREAM_REQ))
 573                 goto out;
 574
 575         if (asoc->strreset_chunk) {
 576                 if (!sctp_chunk_lookup_strreset_param(
 577                                 asoc, outreq->response_seq,
 578                                 SCTP_PARAM_RESET_IN_REQUEST)) {
 579                         /* same process with outstanding isn't 0 */
 580                         result = SCTP_STRRESET_ERR_IN_PROGRESS;
 581                         goto out;
 582                 }
 583
 584                 asoc->strreset_outstanding--;
 585                 asoc->strreset_outseq++;
 586
 587                 if (!asoc->strreset_outstanding) {
 588                         struct sctp_transport *t;
 589
 590                         t = asoc->strreset_chunk->transport;
 591                         if (del_timer(&t->reconf_timer))
 592                                 sctp_transport_put(t);
 593
 594                         sctp_chunk_put(asoc->strreset_chunk);
 595                         asoc->strreset_chunk = NULL;
 596                 }
 597
 598                 flags = SCTP_STREAM_RESET_INCOMING_SSN;
 599         }
 600
 601         nums = (ntohs(param.p->length) - sizeof(*outreq)) / sizeof(__u16);
 602         if (nums) {
 603                 str_p = outreq->list_of_streams;
 604                 for (i = 0; i < nums; i++) {
 605                         if (ntohs(str_p[i]) >= stream->incnt) {
 606                                 result = SCTP_STRRESET_ERR_WRONG_SSN;
 607                                 goto out;
 608                         }
 609                 }
 610
 611                 for (i = 0; i < nums; i++)
 612                         stream->in[ntohs(str_p[i])].mid = 0;
 613         } else {
 614                 for (i = 0; i < stream->incnt; i++)
 615                         stream->in[i].mid = 0;
 616         }
 617
 618         result = SCTP_STRRESET_PERFORMED;
 619
 620         *evp = sctp_ulpevent_make_stream_reset_event(asoc,
 621                 flags | SCTP_STREAM_RESET_OUTGOING_SSN, nums, str_p,
 622                 GFP_ATOMIC);
 623
 624 out:
 625         sctp_update_strreset_result(asoc, result);
 626 err:
 627         return sctp_make_strreset_resp(asoc, result, request_seq);
 628 }
 629
 630 struct sctp_chunk *sctp_process_strreset_inreq(
 631                                 struct sctp_association *asoc,
 632                                 union sctp_params param,
 633                                 struct sctp_ulpevent **evp)
 634 {
 635         struct sctp_strreset_inreq *inreq = param.v;
 636         struct sctp_stream *stream = &asoc->stream;
 637         __u32 result = SCTP_STRRESET_DENIED;
 638         struct sctp_chunk *chunk = NULL;
 639         __u32 request_seq;
 640         __u16 i, nums;
 641         __be16 *str_p;
 642
 643         request_seq = ntohl(inreq->request_seq);
 644         if (TSN_lt(asoc->strreset_inseq, request_seq) ||
 645             TSN_lt(request_seq, asoc->strreset_inseq - 2)) {
 646                 result = SCTP_STRRESET_ERR_BAD_SEQNO;
 647                 goto err;
 648         } else if (TSN_lt(request_seq, asoc->strreset_inseq)) {
 649                 i = asoc->strreset_inseq - request_seq - 1;
 650                 result = asoc->strreset_result[i];
 651                 if (result == SCTP_STRRESET_PERFORMED)
 652                         return NULL;
 653                 goto err;
 654         }
 655         asoc->strreset_inseq++;
 656
 657         if (!(asoc->strreset_enable & SCTP_ENABLE_RESET_STREAM_REQ))
 658                 goto out;
 659
 660         if (asoc->strreset_outstanding) {
 661                 result = SCTP_STRRESET_ERR_IN_PROGRESS;
 662                 goto out;
 663         }
 664
 665         nums = (ntohs(param.p->length) - sizeof(*inreq)) / sizeof(__u16);
 666         str_p = inreq->list_of_streams;
 667         for (i = 0; i < nums; i++) {
 668                 if (ntohs(str_p[i]) >= stream->outcnt) {
 669                         result = SCTP_STRRESET_ERR_WRONG_SSN;
 670                         goto out;
 671                 }
 672         }
 673
 674         if (!sctp_stream_outq_is_empty(stream, nums, str_p)) {
 675                 result = SCTP_STRRESET_IN_PROGRESS;
 676                 asoc->strreset_inseq--;
 677                 goto err;
 678         }
 679
 680         chunk = sctp_make_strreset_req(asoc, nums, str_p, 1, 0);
 681         if (!chunk)
 682                 goto out;
 683
 684         if (nums)
 685                 for (i = 0; i < nums; i++)
 686                         stream->out[ntohs(str_p[i])].state =
 687                                                SCTP_STREAM_CLOSED;
 688         else
 689                 for (i = 0; i < stream->outcnt; i++)
 690                         stream->out[i].state = SCTP_STREAM_CLOSED;
 691
 692         asoc->strreset_chunk = chunk;
 693         asoc->strreset_outstanding = 1;
 694         sctp_chunk_hold(asoc->strreset_chunk);
 695
 696         result = SCTP_STRRESET_PERFORMED;
 697
 698         *evp = sctp_ulpevent_make_stream_reset_event(asoc,
 699                 SCTP_STREAM_RESET_INCOMING_SSN, nums, str_p, GFP_ATOMIC);
 700
 701 out:
 702         sctp_update_strreset_result(asoc, result);
 703 err:
 704         if (!chunk)
 705                 chunk =  sctp_make_strreset_resp(asoc, result, request_seq);
 706
 707         return chunk;
 708 }
 709
 710 struct sctp_chunk *sctp_process_strreset_tsnreq(
 711                                 struct sctp_association *asoc,
 712                                 union sctp_params param,
 713                                 struct sctp_ulpevent **evp)
 714 {
 715         __u32 init_tsn = 0, next_tsn = 0, max_tsn_seen;
 716         struct sctp_strreset_tsnreq *tsnreq = param.v;
 717         struct sctp_stream *stream = &asoc->stream;
 718         __u32 result = SCTP_STRRESET_DENIED;
 719         __u32 request_seq;
 720         __u16 i;
 721
 722         request_seq = ntohl(tsnreq->request_seq);
 723         if (TSN_lt(asoc->strreset_inseq, request_seq) ||
 724             TSN_lt(request_seq, asoc->strreset_inseq - 2)) {
 725                 result = SCTP_STRRESET_ERR_BAD_SEQNO;
 726                 goto err;
 727         } else if (TSN_lt(request_seq, asoc->strreset_inseq)) {
 728                 i = asoc->strreset_inseq - request_seq - 1;
 729                 result = asoc->strreset_result[i];
 730                 if (result == SCTP_STRRESET_PERFORMED) {
 731                         next_tsn = asoc->ctsn_ack_point + 1;
 732                         init_tsn =
 733                                 sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map) + 1;
 734                 }
 735                 goto err;
 736         }
 737
 738         if (!sctp_outq_is_empty(&asoc->outqueue)) {
 739                 result = SCTP_STRRESET_IN_PROGRESS;
 740                 goto err;
 741         }
 742
 743         asoc->strreset_inseq++;
 744
 745         if (!(asoc->strreset_enable & SCTP_ENABLE_RESET_ASSOC_REQ))
 746                 goto out;
 747
 748         if (asoc->strreset_outstanding) {
 749                 result = SCTP_STRRESET_ERR_IN_PROGRESS;
 750                 goto out;
 751         }
 752
 753         /* G4: The same processing as though a FWD-TSN chunk (as defined in
 754          *     [RFC3758]) with all streams affected and a new cumulative TSN
 755          *     ACK of the Receiver's Next TSN minus 1 were received MUST be
 756          *     performed.
 757          */
 758         max_tsn_seen = sctp_tsnmap_get_max_tsn_seen(&asoc->peer.tsn_map);
 759         asoc->stream.si->report_ftsn(&asoc->ulpq, max_tsn_seen);
 760
 761         /* G1: Compute an appropriate value for the Receiver's Next TSN -- the
 762          *     TSN that the peer should use to send the next DATA chunk.  The
 763          *     value SHOULD be the smallest TSN not acknowledged by the
 764          *     receiver of the request plus 2^31.
 765          */
 766         init_tsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map) + (1 << 31);
 767         sctp_tsnmap_init(&asoc->peer.tsn_map, SCTP_TSN_MAP_INITIAL,
 768                          init_tsn, GFP_ATOMIC);
 769
 770         /* G3: The same processing as though a SACK chunk with no gap report
 771          *     and a cumulative TSN ACK of the Sender's Next TSN minus 1 were
 772          *     received MUST be performed.
 773          */
 774         sctp_outq_free(&asoc->outqueue);
 775
 776         /* G2: Compute an appropriate value for the local endpoint's next TSN,
 777          *     i.e., the next TSN assigned by the receiver of the SSN/TSN reset
 778          *     chunk.  The value SHOULD be the highest TSN sent by the receiver
 779          *     of the request plus 1.
 780          */
 781         next_tsn = asoc->next_tsn;
 782         asoc->ctsn_ack_point = next_tsn - 1;
 783         asoc->adv_peer_ack_point = asoc->ctsn_ack_point;
 784
 785         /* G5:  The next expected and outgoing SSNs MUST be reset to 0 for all
 786          *      incoming and outgoing streams.
 787          */
 788         for (i = 0; i < stream->outcnt; i++) {
 789                 stream->out[i].mid = 0;
 790                 stream->out[i].mid_uo = 0;
 791         }
 792         for (i = 0; i < stream->incnt; i++)
 793                 stream->in[i].mid = 0;
 794
 795         result = SCTP_STRRESET_PERFORMED;
 796
 797         *evp = sctp_ulpevent_make_assoc_reset_event(asoc, 0, init_tsn,
 798                                                     next_tsn, GFP_ATOMIC);
 799
 800 out:
 801         sctp_update_strreset_result(asoc, result);
 802 err:
 803         return sctp_make_strreset_tsnresp(asoc, result, request_seq,
 804                                           next_tsn, init_tsn);
 805 }
 806
 807 struct sctp_chunk *sctp_process_strreset_addstrm_out(
 808                                 struct sctp_association *asoc,
 809                                 union sctp_params param,
 810                                 struct sctp_ulpevent **evp)
 811 {
 812         struct sctp_strreset_addstrm *addstrm = param.v;
 813         struct sctp_stream *stream = &asoc->stream;
 814         __u32 result = SCTP_STRRESET_DENIED;
 815         __u32 request_seq, incnt;
 816         __u16 in, i;
 817
 818         request_seq = ntohl(addstrm->request_seq);
 819         if (TSN_lt(asoc->strreset_inseq, request_seq) ||
 820             TSN_lt(request_seq, asoc->strreset_inseq - 2)) {
 821                 result = SCTP_STRRESET_ERR_BAD_SEQNO;
 822                 goto err;
 823         } else if (TSN_lt(request_seq, asoc->strreset_inseq)) {
 824                 i = asoc->strreset_inseq - request_seq - 1;
 825                 result = asoc->strreset_result[i];
 826                 goto err;
 827         }
 828         asoc->strreset_inseq++;
 829
 830         if (!(asoc->strreset_enable & SCTP_ENABLE_CHANGE_ASSOC_REQ))
 831                 goto out;
 832
 833         if (asoc->strreset_chunk) {
 834                 if (!sctp_chunk_lookup_strreset_param(
 835                         asoc, 0, SCTP_PARAM_RESET_ADD_IN_STREAMS)) {
 836                         /* same process with outstanding isn't 0 */
 837                         result = SCTP_STRRESET_ERR_IN_PROGRESS;
 838                         goto out;
 839                 }
 840
 841                 asoc->strreset_outstanding--;
 842                 asoc->strreset_outseq++;
 843
 844                 if (!asoc->strreset_outstanding) {
 845                         struct sctp_transport *t;
 846
 847                         t = asoc->strreset_chunk->transport;
 848                         if (del_timer(&t->reconf_timer))
 849                                 sctp_transport_put(t);
 850
 851                         sctp_chunk_put(asoc->strreset_chunk);
 852                         asoc->strreset_chunk = NULL;
 853                 }
 854         }
 855
 856         in = ntohs(addstrm->number_of_streams);
 857         incnt = stream->incnt + in;
 858         if (!in || incnt > SCTP_MAX_STREAM)
 859                 goto out;
 860
 861         if (sctp_stream_alloc_in(stream, incnt, GFP_ATOMIC))
 862                 goto out;
 863
 864         stream->incnt = incnt;
 865
 866         result = SCTP_STRRESET_PERFORMED;
 867
 868         *evp = sctp_ulpevent_make_stream_change_event(asoc,
 869                 0, ntohs(addstrm->number_of_streams), 0, GFP_ATOMIC);
 870
 871 out:
 872         sctp_update_strreset_result(asoc, result);
 873 err:
 874         return sctp_make_strreset_resp(asoc, result, request_seq);
 875 }
 876
 877 struct sctp_chunk *sctp_process_strreset_addstrm_in(
 878                                 struct sctp_association *asoc,
 879                                 union sctp_params param,
 880                                 struct sctp_ulpevent **evp)
 881 {
 882         struct sctp_strreset_addstrm *addstrm = param.v;
 883         struct sctp_stream *stream = &asoc->stream;
 884         __u32 result = SCTP_STRRESET_DENIED;
 885         struct sctp_chunk *chunk = NULL;
 886         __u32 request_seq, outcnt;
 887         __u16 out, i;
 888         int ret;
 889
 890         request_seq = ntohl(addstrm->request_seq);
 891         if (TSN_lt(asoc->strreset_inseq, request_seq) ||
 892             TSN_lt(request_seq, asoc->strreset_inseq - 2)) {
 893                 result = SCTP_STRRESET_ERR_BAD_SEQNO;
 894                 goto err;
 895         } else if (TSN_lt(request_seq, asoc->strreset_inseq)) {
 896                 i = asoc->strreset_inseq - request_seq - 1;
 897                 result = asoc->strreset_result[i];
 898                 if (result == SCTP_STRRESET_PERFORMED)
 899                         return NULL;
 900                 goto err;
 901         }
 902         asoc->strreset_inseq++;
 903
 904         if (!(asoc->strreset_enable & SCTP_ENABLE_CHANGE_ASSOC_REQ))
 905                 goto out;
 906
 907         if (asoc->strreset_outstanding) {
 908                 result = SCTP_STRRESET_ERR_IN_PROGRESS;
 909                 goto out;
 910         }
 911
 912         out = ntohs(addstrm->number_of_streams);
 913         outcnt = stream->outcnt + out;
 914         if (!out || outcnt > SCTP_MAX_STREAM)
 915                 goto out;
 916
 917         ret = sctp_stream_alloc_out(stream, outcnt, GFP_ATOMIC);
 918         if (ret)
 919                 goto out;
 920
 921         chunk = sctp_make_strreset_addstrm(asoc, out, 0);
 922         if (!chunk)
 923                 goto out;
 924
 925         asoc->strreset_chunk = chunk;
 926         asoc->strreset_outstanding = 1;
 927         sctp_chunk_hold(asoc->strreset_chunk);
 928
 929         stream->outcnt = outcnt;
 930
 931         result = SCTP_STRRESET_PERFORMED;
 932
 933         *evp = sctp_ulpevent_make_stream_change_event(asoc,
 934                 0, 0, ntohs(addstrm->number_of_streams), GFP_ATOMIC);
 935
 936 out:
 937         sctp_update_strreset_result(asoc, result);
 938 err:
 939         if (!chunk)
 940                 chunk = sctp_make_strreset_resp(asoc, result, request_seq);
 941
 942         return chunk;
 943 }
 944
 945 struct sctp_chunk *sctp_process_strreset_resp(
 946                                 struct sctp_association *asoc,
 947                                 union sctp_params param,
 948                                 struct sctp_ulpevent **evp)
 949 {
 950         struct sctp_stream *stream = &asoc->stream;
 951         struct sctp_strreset_resp *resp = param.v;
 952         struct sctp_transport *t;
 953         __u16 i, nums, flags = 0;
 954         struct sctp_paramhdr *req;
 955         __u32 result;
 956
 957         req = sctp_chunk_lookup_strreset_param(asoc, resp->response_seq, 0);
 958         if (!req)
 959                 return NULL;
 960
 961         result = ntohl(resp->result);
 962         if (result != SCTP_STRRESET_PERFORMED) {
 963                 /* if in progress, do nothing but retransmit */
 964                 if (result == SCTP_STRRESET_IN_PROGRESS)
 965                         return NULL;
 966                 else if (result == SCTP_STRRESET_DENIED)
 967                         flags = SCTP_STREAM_RESET_DENIED;
 968                 else
 969                         flags = SCTP_STREAM_RESET_FAILED;
 970         }
 971
 972         if (req->type == SCTP_PARAM_RESET_OUT_REQUEST) {
 973                 struct sctp_strreset_outreq *outreq;
 974                 __be16 *str_p;
 975
 976                 outreq = (struct sctp_strreset_outreq *)req;
 977                 str_p = outreq->list_of_streams;
 978                 nums = (ntohs(outreq->param_hdr.length) - sizeof(*outreq)) /
 979                        sizeof(__u16);
 980
 981                 if (result == SCTP_STRRESET_PERFORMED) {
 982                         if (nums) {
 983                                 for (i = 0; i < nums; i++) {
 984                                         stream->out[ntohs(str_p[i])].mid = 0;
 985                                         stream->out[ntohs(str_p[i])].mid_uo = 0;
 986                                 }
 987                         } else {
 988                                 for (i = 0; i < stream->outcnt; i++) {
 989                                         stream->out[i].mid = 0;
 990                                         stream->out[i].mid_uo = 0;
 991                                 }
 992                         }
 993
 994                         flags = SCTP_STREAM_RESET_OUTGOING_SSN;
 995                 }
 996
 997                 for (i = 0; i < stream->outcnt; i++)
 998                         stream->out[i].state = SCTP_STREAM_OPEN;
 999
1000                 *evp = sctp_ulpevent_make_stream_reset_event(asoc, flags,
1001                         nums, str_p, GFP_ATOMIC);
1002         } else if (req->type == SCTP_PARAM_RESET_IN_REQUEST) {
1003                 struct sctp_strreset_inreq *inreq;
1004                 __be16 *str_p;
1005
1006                 /* if the result is performed, it's impossible for inreq */
1007                 if (result == SCTP_STRRESET_PERFORMED)
1008                         return NULL;
1009
1010                 inreq = (struct sctp_strreset_inreq *)req;
1011                 str_p = inreq->list_of_streams;
1012                 nums = (ntohs(inreq->param_hdr.length) - sizeof(*inreq)) /
1013                        sizeof(__u16);
1014
1015                 *evp = sctp_ulpevent_make_stream_reset_event(asoc, flags,
1016                         nums, str_p, GFP_ATOMIC);
1017         } else if (req->type == SCTP_PARAM_RESET_TSN_REQUEST) {
1018                 struct sctp_strreset_resptsn *resptsn;
1019                 __u32 stsn, rtsn;
1020
1021                 /* check for resptsn, as sctp_verify_reconf didn't do it*/
1022                 if (ntohs(param.p->length) != sizeof(*resptsn))
1023                         return NULL;
1024
1025                 resptsn = (struct sctp_strreset_resptsn *)resp;
1026                 stsn = ntohl(resptsn->senders_next_tsn);
1027                 rtsn = ntohl(resptsn->receivers_next_tsn);
1028
1029                 if (result == SCTP_STRRESET_PERFORMED) {
1030                         __u32 mtsn = sctp_tsnmap_get_max_tsn_seen(
1031                                                 &asoc->peer.tsn_map);
1032                         LIST_HEAD(temp);
1033
1034                         asoc->stream.si->report_ftsn(&asoc->ulpq, mtsn);
1035
1036                         sctp_tsnmap_init(&asoc->peer.tsn_map,
1037                                          SCTP_TSN_MAP_INITIAL,
1038                                          stsn, GFP_ATOMIC);
1039
1040                         /* Clean up sacked and abandoned queues only. As the
1041                          * out_chunk_list may not be empty, splice it to temp,
1042                          * then get it back after sctp_outq_free is done.
1043                          */
1044                         list_splice_init(&asoc->outqueue.out_chunk_list, &temp);
1045                         sctp_outq_free(&asoc->outqueue);
1046                         list_splice_init(&temp, &asoc->outqueue.out_chunk_list);
1047
1048                         asoc->next_tsn = rtsn;
1049                         asoc->ctsn_ack_point = asoc->next_tsn - 1;
1050                         asoc->adv_peer_ack_point = asoc->ctsn_ack_point;
1051
1052                         for (i = 0; i < stream->outcnt; i++) {
1053                                 stream->out[i].mid = 0;
1054                                 stream->out[i].mid_uo = 0;
1055                         }
1056                         for (i = 0; i < stream->incnt; i++)
1057                                 stream->in[i].mid = 0;
1058                 }
1059
1060                 for (i = 0; i < stream->outcnt; i++)
1061                         stream->out[i].state = SCTP_STREAM_OPEN;
1062
1063                 *evp = sctp_ulpevent_make_assoc_reset_event(asoc, flags,
1064                         stsn, rtsn, GFP_ATOMIC);
1065         } else if (req->type == SCTP_PARAM_RESET_ADD_OUT_STREAMS) {
1066                 struct sctp_strreset_addstrm *addstrm;
1067                 __u16 number;
1068
1069                 addstrm = (struct sctp_strreset_addstrm *)req;
1070                 nums = ntohs(addstrm->number_of_streams);
1071                 number = stream->outcnt - nums;
1072
1073                 if (result == SCTP_STRRESET_PERFORMED)
1074                         for (i = number; i < stream->outcnt; i++)
1075                                 stream->out[i].state = SCTP_STREAM_OPEN;
1076                 else
1077                         stream->outcnt = number;
1078
1079                 *evp = sctp_ulpevent_make_stream_change_event(asoc, flags,
1080                         0, nums, GFP_ATOMIC);
1081         } else if (req->type == SCTP_PARAM_RESET_ADD_IN_STREAMS) {
1082                 struct sctp_strreset_addstrm *addstrm;
1083
1084                 /* if the result is performed, it's impossible for addstrm in
1085                  * request.
1086                  */
1087                 if (result == SCTP_STRRESET_PERFORMED)
1088                         return NULL;
1089
1090                 addstrm = (struct sctp_strreset_addstrm *)req;
1091                 nums = ntohs(addstrm->number_of_streams);
1092
1093                 *evp = sctp_ulpevent_make_stream_change_event(asoc, flags,
1094                         nums, 0, GFP_ATOMIC);
1095         }
1096
1097         asoc->strreset_outstanding--;
1098         asoc->strreset_outseq++;
1099
1100         /* remove everything for this reconf request */
1101         if (!asoc->strreset_outstanding) {
1102                 t = asoc->strreset_chunk->transport;
1103                 if (del_timer(&t->reconf_timer))
1104                         sctp_transport_put(t);
1105
1106                 sctp_chunk_put(asoc->strreset_chunk);
1107                 asoc->strreset_chunk = NULL;
1108         }
1109
1110         return NULL;
1111 }