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