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 <net/sctp/sctp.h>
  36 #include <net/sctp/sm.h>
  37
  38 int sctp_stream_init(struct sctp_stream *stream, __u16 outcnt, __u16 incnt,
  39                      gfp_t gfp)
  40 {
  41         int i;
  42
  43         /* Initial stream->out size may be very big, so free it and alloc
  44          * a new one with new outcnt to save memory.
  45          */
  46         kfree(stream->out);
  47
  48         stream->out = kcalloc(outcnt, sizeof(*stream->out), gfp);
  49         if (!stream->out)
  50                 return -ENOMEM;
  51
  52         stream->outcnt = outcnt;
  53         for (i = 0; i < stream->outcnt; i++)
  54                 stream->out[i].state = SCTP_STREAM_OPEN;
  55
  56         if (!incnt)
  57                 return 0;
  58
  59         stream->in = kcalloc(incnt, sizeof(*stream->in), gfp);
  60         if (!stream->in) {
  61                 kfree(stream->out);
  62                 stream->out = NULL;
  63                 return -ENOMEM;
  64         }
  65
  66         stream->incnt = incnt;
  67
  68         return 0;
  69 }
  70
  71 void sctp_stream_free(struct sctp_stream *stream)
  72 {
  73         kfree(stream->out);
  74         kfree(stream->in);
  75 }
  76
  77 void sctp_stream_clear(struct sctp_stream *stream)
  78 {
  79         int i;
  80
  81         for (i = 0; i < stream->outcnt; i++)
  82                 stream->out[i].ssn = 0;
  83
  84         for (i = 0; i < stream->incnt; i++)
  85                 stream->in[i].ssn = 0;
  86 }
  87
  88 void sctp_stream_update(struct sctp_stream *stream, struct sctp_stream *new)
  89 {
  90         sctp_stream_free(stream);
  91
  92         stream->out = new->out;
  93         stream->in  = new->in;
  94         stream->outcnt = new->outcnt;
  95         stream->incnt  = new->incnt;
  96
  97         new->out = NULL;
  98         new->in  = NULL;
  99 }
 100
 101 static int sctp_send_reconf(struct sctp_association *asoc,
 102                             struct sctp_chunk *chunk)
 103 {
 104         struct net *net = sock_net(asoc->base.sk);
 105         int retval = 0;
 106
 107         retval = sctp_primitive_RECONF(net, asoc, chunk);
 108         if (retval)
 109                 sctp_chunk_free(chunk);
 110
 111         return retval;
 112 }
 113
 114 int sctp_send_reset_streams(struct sctp_association *asoc,
 115                             struct sctp_reset_streams *params)
 116 {
 117         struct sctp_stream *stream = &asoc->stream;
 118         __u16 i, str_nums, *str_list;
 119         struct sctp_chunk *chunk;
 120         int retval = -EINVAL;
 121         bool out, in;
 122
 123         if (!asoc->peer.reconf_capable ||
 124             !(asoc->strreset_enable & SCTP_ENABLE_RESET_STREAM_REQ)) {
 125                 retval = -ENOPROTOOPT;
 126                 goto out;
 127         }
 128
 129         if (asoc->strreset_outstanding) {
 130                 retval = -EINPROGRESS;
 131                 goto out;
 132         }
 133
 134         out = params->srs_flags & SCTP_STREAM_RESET_OUTGOING;
 135         in  = params->srs_flags & SCTP_STREAM_RESET_INCOMING;
 136         if (!out && !in)
 137                 goto out;
 138
 139         str_nums = params->srs_number_streams;
 140         str_list = params->srs_stream_list;
 141         if (out && str_nums)
 142                 for (i = 0; i < str_nums; i++)
 143                         if (str_list[i] >= stream->outcnt)
 144                                 goto out;
 145
 146         if (in && str_nums)
 147                 for (i = 0; i < str_nums; i++)
 148                         if (str_list[i] >= stream->incnt)
 149                                 goto out;
 150
 151         for (i = 0; i < str_nums; i++)
 152                 str_list[i] = htons(str_list[i]);
 153
 154         chunk = sctp_make_strreset_req(asoc, str_nums, str_list, out, in);
 155
 156         for (i = 0; i < str_nums; i++)
 157                 str_list[i] = ntohs(str_list[i]);
 158
 159         if (!chunk) {
 160                 retval = -ENOMEM;
 161                 goto out;
 162         }
 163
 164         if (out) {
 165                 if (str_nums)
 166                         for (i = 0; i < str_nums; i++)
 167                                 stream->out[str_list[i]].state =
 168                                                        SCTP_STREAM_CLOSED;
 169                 else
 170                         for (i = 0; i < stream->outcnt; i++)
 171                                 stream->out[i].state = SCTP_STREAM_CLOSED;
 172         }
 173
 174         asoc->strreset_chunk = chunk;
 175         sctp_chunk_hold(asoc->strreset_chunk);
 176
 177         retval = sctp_send_reconf(asoc, chunk);
 178         if (retval) {
 179                 sctp_chunk_put(asoc->strreset_chunk);
 180                 asoc->strreset_chunk = NULL;
 181                 if (!out)
 182                         goto out;
 183
 184                 if (str_nums)
 185                         for (i = 0; i < str_nums; i++)
 186                                 stream->out[str_list[i]].state =
 187                                                        SCTP_STREAM_OPEN;
 188                 else
 189                         for (i = 0; i < stream->outcnt; i++)
 190                                 stream->out[i].state = SCTP_STREAM_OPEN;
 191
 192                 goto out;
 193         }
 194
 195         asoc->strreset_outstanding = out + in;
 196
 197 out:
 198         return retval;
 199 }
 200
 201 int sctp_send_reset_assoc(struct sctp_association *asoc)
 202 {
 203         struct sctp_stream *stream = &asoc->stream;
 204         struct sctp_chunk *chunk = NULL;
 205         int retval;
 206         __u16 i;
 207
 208         if (!asoc->peer.reconf_capable ||
 209             !(asoc->strreset_enable & SCTP_ENABLE_RESET_ASSOC_REQ))
 210                 return -ENOPROTOOPT;
 211
 212         if (asoc->strreset_outstanding)
 213                 return -EINPROGRESS;
 214
 215         chunk = sctp_make_strreset_tsnreq(asoc);
 216         if (!chunk)
 217                 return -ENOMEM;
 218
 219         /* Block further xmit of data until this request is completed */
 220         for (i = 0; i < stream->outcnt; i++)
 221                 stream->out[i].state = SCTP_STREAM_CLOSED;
 222
 223         asoc->strreset_chunk = chunk;
 224         sctp_chunk_hold(asoc->strreset_chunk);
 225
 226         retval = sctp_send_reconf(asoc, chunk);
 227         if (retval) {
 228                 sctp_chunk_put(asoc->strreset_chunk);
 229                 asoc->strreset_chunk = NULL;
 230
 231                 for (i = 0; i < stream->outcnt; i++)
 232                         stream->out[i].state = SCTP_STREAM_OPEN;
 233
 234                 return retval;
 235         }
 236
 237         asoc->strreset_outstanding = 1;
 238
 239         return 0;
 240 }
 241
 242 int sctp_send_add_streams(struct sctp_association *asoc,
 243                           struct sctp_add_streams *params)
 244 {
 245         struct sctp_stream *stream = &asoc->stream;
 246         struct sctp_chunk *chunk = NULL;
 247         int retval = -ENOMEM;
 248         __u32 outcnt, incnt;
 249         __u16 out, in;
 250
 251         if (!asoc->peer.reconf_capable ||
 252             !(asoc->strreset_enable & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
 253                 retval = -ENOPROTOOPT;
 254                 goto out;
 255         }
 256
 257         if (asoc->strreset_outstanding) {
 258                 retval = -EINPROGRESS;
 259                 goto out;
 260         }
 261
 262         out = params->sas_outstrms;
 263         in  = params->sas_instrms;
 264         outcnt = stream->outcnt + out;
 265         incnt = stream->incnt + in;
 266         if (outcnt > SCTP_MAX_STREAM || incnt > SCTP_MAX_STREAM ||
 267             (!out && !in)) {
 268                 retval = -EINVAL;
 269                 goto out;
 270         }
 271
 272         if (out) {
 273                 struct sctp_stream_out *streamout;
 274
 275                 streamout = krealloc(stream->out, outcnt * sizeof(*streamout),
 276                                      GFP_KERNEL);
 277                 if (!streamout)
 278                         goto out;
 279
 280                 memset(streamout + stream->outcnt, 0, out * sizeof(*streamout));
 281                 stream->out = streamout;
 282         }
 283
 284         chunk = sctp_make_strreset_addstrm(asoc, out, in);
 285         if (!chunk)
 286                 goto out;
 287
 288         asoc->strreset_chunk = chunk;
 289         sctp_chunk_hold(asoc->strreset_chunk);
 290
 291         retval = sctp_send_reconf(asoc, chunk);
 292         if (retval) {
 293                 sctp_chunk_put(asoc->strreset_chunk);
 294                 asoc->strreset_chunk = NULL;
 295                 goto out;
 296         }
 297
 298         stream->incnt = incnt;
 299         stream->outcnt = outcnt;
 300
 301         asoc->strreset_outstanding = !!out + !!in;
 302
 303 out:
 304         return retval;
 305 }
 306
 307 static sctp_paramhdr_t *sctp_chunk_lookup_strreset_param(
 308                         struct sctp_association *asoc, __u32 resp_seq,
 309                         __be16 type)
 310 {
 311         struct sctp_chunk *chunk = asoc->strreset_chunk;
 312         struct sctp_reconf_chunk *hdr;
 313         union sctp_params param;
 314
 315         if (!chunk)
 316                 return NULL;
 317
 318         hdr = (struct sctp_reconf_chunk *)chunk->chunk_hdr;
 319         sctp_walk_params(param, hdr, params) {
 320                 /* sctp_strreset_tsnreq is actually the basic structure
 321                  * of all stream reconf params, so it's safe to use it
 322                  * to access request_seq.
 323                  */
 324                 struct sctp_strreset_tsnreq *req = param.v;
 325
 326                 if ((!resp_seq || req->request_seq == resp_seq) &&
 327                     (!type || type == req->param_hdr.type))
 328                         return param.v;
 329         }
 330
 331         return NULL;
 332 }
 333
 334 static void sctp_update_strreset_result(struct sctp_association *asoc,
 335                                         __u32 result)
 336 {
 337         asoc->strreset_result[1] = asoc->strreset_result[0];
 338         asoc->strreset_result[0] = result;
 339 }
 340
 341 struct sctp_chunk *sctp_process_strreset_outreq(
 342                                 struct sctp_association *asoc,
 343                                 union sctp_params param,
 344                                 struct sctp_ulpevent **evp)
 345 {
 346         struct sctp_strreset_outreq *outreq = param.v;
 347         struct sctp_stream *stream = &asoc->stream;
 348         __u16 i, nums, flags = 0, *str_p = NULL;
 349         __u32 result = SCTP_STRRESET_DENIED;
 350         __u32 request_seq;
 351
 352         request_seq = ntohl(outreq->request_seq);
 353
 354         if (ntohl(outreq->send_reset_at_tsn) >
 355             sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map)) {
 356                 result = SCTP_STRRESET_IN_PROGRESS;
 357                 goto err;
 358         }
 359
 360         if (TSN_lt(asoc->strreset_inseq, request_seq) ||
 361             TSN_lt(request_seq, asoc->strreset_inseq - 2)) {
 362                 result = SCTP_STRRESET_ERR_BAD_SEQNO;
 363                 goto err;
 364         } else if (TSN_lt(request_seq, asoc->strreset_inseq)) {
 365                 i = asoc->strreset_inseq - request_seq - 1;
 366                 result = asoc->strreset_result[i];
 367                 goto err;
 368         }
 369         asoc->strreset_inseq++;
 370
 371         /* Check strreset_enable after inseq inc, as sender cannot tell
 372          * the peer doesn't enable strreset after receiving response with
 373          * result denied, as well as to keep consistent with bsd.
 374          */
 375         if (!(asoc->strreset_enable & SCTP_ENABLE_RESET_STREAM_REQ))
 376                 goto out;
 377
 378         if (asoc->strreset_chunk) {
 379                 if (!sctp_chunk_lookup_strreset_param(
 380                                 asoc, outreq->response_seq,
 381                                 SCTP_PARAM_RESET_IN_REQUEST)) {
 382                         /* same process with outstanding isn't 0 */
 383                         result = SCTP_STRRESET_ERR_IN_PROGRESS;
 384                         goto out;
 385                 }
 386
 387                 asoc->strreset_outstanding--;
 388                 asoc->strreset_outseq++;
 389
 390                 if (!asoc->strreset_outstanding) {
 391                         struct sctp_transport *t;
 392
 393                         t = asoc->strreset_chunk->transport;
 394                         if (del_timer(&t->reconf_timer))
 395                                 sctp_transport_put(t);
 396
 397                         sctp_chunk_put(asoc->strreset_chunk);
 398                         asoc->strreset_chunk = NULL;
 399                 }
 400
 401                 flags = SCTP_STREAM_RESET_INCOMING_SSN;
 402         }
 403
 404         nums = (ntohs(param.p->length) - sizeof(*outreq)) / 2;
 405         if (nums) {
 406                 str_p = outreq->list_of_streams;
 407                 for (i = 0; i < nums; i++) {
 408                         if (ntohs(str_p[i]) >= stream->incnt) {
 409                                 result = SCTP_STRRESET_ERR_WRONG_SSN;
 410                                 goto out;
 411                         }
 412                 }
 413
 414                 for (i = 0; i < nums; i++)
 415                         stream->in[ntohs(str_p[i])].ssn = 0;
 416         } else {
 417                 for (i = 0; i < stream->incnt; i++)
 418                         stream->in[i].ssn = 0;
 419         }
 420
 421         result = SCTP_STRRESET_PERFORMED;
 422
 423         *evp = sctp_ulpevent_make_stream_reset_event(asoc,
 424                 flags | SCTP_STREAM_RESET_OUTGOING_SSN, nums, str_p,
 425                 GFP_ATOMIC);
 426
 427 out:
 428         sctp_update_strreset_result(asoc, result);
 429 err:
 430         return sctp_make_strreset_resp(asoc, result, request_seq);
 431 }
 432
 433 struct sctp_chunk *sctp_process_strreset_inreq(
 434                                 struct sctp_association *asoc,
 435                                 union sctp_params param,
 436                                 struct sctp_ulpevent **evp)
 437 {
 438         struct sctp_strreset_inreq *inreq = param.v;
 439         struct sctp_stream *stream = &asoc->stream;
 440         __u32 result = SCTP_STRRESET_DENIED;
 441         struct sctp_chunk *chunk = NULL;
 442         __u16 i, nums, *str_p;
 443         __u32 request_seq;
 444
 445         request_seq = ntohl(inreq->request_seq);
 446         if (TSN_lt(asoc->strreset_inseq, request_seq) ||
 447             TSN_lt(request_seq, asoc->strreset_inseq - 2)) {
 448                 result = SCTP_STRRESET_ERR_BAD_SEQNO;
 449                 goto err;
 450         } else if (TSN_lt(request_seq, asoc->strreset_inseq)) {
 451                 i = asoc->strreset_inseq - request_seq - 1;
 452                 result = asoc->strreset_result[i];
 453                 if (result == SCTP_STRRESET_PERFORMED)
 454                         return NULL;
 455                 goto err;
 456         }
 457         asoc->strreset_inseq++;
 458
 459         if (!(asoc->strreset_enable & SCTP_ENABLE_RESET_STREAM_REQ))
 460                 goto out;
 461
 462         if (asoc->strreset_outstanding) {
 463                 result = SCTP_STRRESET_ERR_IN_PROGRESS;
 464                 goto out;
 465         }
 466
 467         nums = (ntohs(param.p->length) - sizeof(*inreq)) / 2;
 468         str_p = inreq->list_of_streams;
 469         for (i = 0; i < nums; i++) {
 470                 if (ntohs(str_p[i]) >= stream->outcnt) {
 471                         result = SCTP_STRRESET_ERR_WRONG_SSN;
 472                         goto out;
 473                 }
 474         }
 475
 476         chunk = sctp_make_strreset_req(asoc, nums, str_p, 1, 0);
 477         if (!chunk)
 478                 goto out;
 479
 480         if (nums)
 481                 for (i = 0; i < nums; i++)
 482                         stream->out[ntohs(str_p[i])].state =
 483                                                SCTP_STREAM_CLOSED;
 484         else
 485                 for (i = 0; i < stream->outcnt; i++)
 486                         stream->out[i].state = SCTP_STREAM_CLOSED;
 487
 488         asoc->strreset_chunk = chunk;
 489         asoc->strreset_outstanding = 1;
 490         sctp_chunk_hold(asoc->strreset_chunk);
 491
 492         result = SCTP_STRRESET_PERFORMED;
 493
 494         *evp = sctp_ulpevent_make_stream_reset_event(asoc,
 495                 SCTP_STREAM_RESET_INCOMING_SSN, nums, str_p, GFP_ATOMIC);
 496
 497 out:
 498         sctp_update_strreset_result(asoc, result);
 499 err:
 500         if (!chunk)
 501                 chunk =  sctp_make_strreset_resp(asoc, result, request_seq);
 502
 503         return chunk;
 504 }
 505
 506 struct sctp_chunk *sctp_process_strreset_tsnreq(
 507                                 struct sctp_association *asoc,
 508                                 union sctp_params param,
 509                                 struct sctp_ulpevent **evp)
 510 {
 511         __u32 init_tsn = 0, next_tsn = 0, max_tsn_seen;
 512         struct sctp_strreset_tsnreq *tsnreq = param.v;
 513         struct sctp_stream *stream = &asoc->stream;
 514         __u32 result = SCTP_STRRESET_DENIED;
 515         __u32 request_seq;
 516         __u16 i;
 517
 518         request_seq = ntohl(tsnreq->request_seq);
 519         if (TSN_lt(asoc->strreset_inseq, request_seq) ||
 520             TSN_lt(request_seq, asoc->strreset_inseq - 2)) {
 521                 result = SCTP_STRRESET_ERR_BAD_SEQNO;
 522                 goto err;
 523         } else if (TSN_lt(request_seq, asoc->strreset_inseq)) {
 524                 i = asoc->strreset_inseq - request_seq - 1;
 525                 result = asoc->strreset_result[i];
 526                 if (result == SCTP_STRRESET_PERFORMED) {
 527                         next_tsn = asoc->next_tsn;
 528                         init_tsn =
 529                                 sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map) + 1;
 530                 }
 531                 goto err;
 532         }
 533         asoc->strreset_inseq++;
 534
 535         if (!(asoc->strreset_enable & SCTP_ENABLE_RESET_ASSOC_REQ))
 536                 goto out;
 537
 538         if (asoc->strreset_outstanding) {
 539                 result = SCTP_STRRESET_ERR_IN_PROGRESS;
 540                 goto out;
 541         }
 542
 543         /* G3: The same processing as though a SACK chunk with no gap report
 544          *     and a cumulative TSN ACK of the Sender's Next TSN minus 1 were
 545          *     received MUST be performed.
 546          */
 547         max_tsn_seen = sctp_tsnmap_get_max_tsn_seen(&asoc->peer.tsn_map);
 548         sctp_ulpq_reasm_flushtsn(&asoc->ulpq, max_tsn_seen);
 549         sctp_ulpq_abort_pd(&asoc->ulpq, GFP_ATOMIC);
 550
 551         /* G1: Compute an appropriate value for the Receiver's Next TSN -- the
 552          *     TSN that the peer should use to send the next DATA chunk.  The
 553          *     value SHOULD be the smallest TSN not acknowledged by the
 554          *     receiver of the request plus 2^31.
 555          */
 556         init_tsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map) + (1 << 31);
 557         sctp_tsnmap_init(&asoc->peer.tsn_map, SCTP_TSN_MAP_INITIAL,
 558                          init_tsn, GFP_ATOMIC);
 559
 560         /* G4: The same processing as though a FWD-TSN chunk (as defined in
 561          *     [RFC3758]) with all streams affected and a new cumulative TSN
 562          *     ACK of the Receiver's Next TSN minus 1 were received MUST be
 563          *     performed.
 564          */
 565         sctp_outq_free(&asoc->outqueue);
 566
 567         /* G2: Compute an appropriate value for the local endpoint's next TSN,
 568          *     i.e., the next TSN assigned by the receiver of the SSN/TSN reset
 569          *     chunk.  The value SHOULD be the highest TSN sent by the receiver
 570          *     of the request plus 1.
 571          */
 572         next_tsn = asoc->next_tsn;
 573         asoc->ctsn_ack_point = next_tsn - 1;
 574         asoc->adv_peer_ack_point = asoc->ctsn_ack_point;
 575
 576         /* G5:  The next expected and outgoing SSNs MUST be reset to 0 for all
 577          *      incoming and outgoing streams.
 578          */
 579         for (i = 0; i < stream->outcnt; i++)
 580                 stream->out[i].ssn = 0;
 581         for (i = 0; i < stream->incnt; i++)
 582                 stream->in[i].ssn = 0;
 583
 584         result = SCTP_STRRESET_PERFORMED;
 585
 586         *evp = sctp_ulpevent_make_assoc_reset_event(asoc, 0, init_tsn,
 587                                                     next_tsn, GFP_ATOMIC);
 588
 589 out:
 590         sctp_update_strreset_result(asoc, result);
 591 err:
 592         return sctp_make_strreset_tsnresp(asoc, result, request_seq,
 593                                           next_tsn, init_tsn);
 594 }
 595
 596 struct sctp_chunk *sctp_process_strreset_addstrm_out(
 597                                 struct sctp_association *asoc,
 598                                 union sctp_params param,
 599                                 struct sctp_ulpevent **evp)
 600 {
 601         struct sctp_strreset_addstrm *addstrm = param.v;
 602         struct sctp_stream *stream = &asoc->stream;
 603         __u32 result = SCTP_STRRESET_DENIED;
 604         struct sctp_stream_in *streamin;
 605         __u32 request_seq, incnt;
 606         __u16 in, i;
 607
 608         request_seq = ntohl(addstrm->request_seq);
 609         if (TSN_lt(asoc->strreset_inseq, request_seq) ||
 610             TSN_lt(request_seq, asoc->strreset_inseq - 2)) {
 611                 result = SCTP_STRRESET_ERR_BAD_SEQNO;
 612                 goto err;
 613         } else if (TSN_lt(request_seq, asoc->strreset_inseq)) {
 614                 i = asoc->strreset_inseq - request_seq - 1;
 615                 result = asoc->strreset_result[i];
 616                 goto err;
 617         }
 618         asoc->strreset_inseq++;
 619
 620         if (!(asoc->strreset_enable & SCTP_ENABLE_CHANGE_ASSOC_REQ))
 621                 goto out;
 622
 623         if (asoc->strreset_chunk) {
 624                 if (!sctp_chunk_lookup_strreset_param(
 625                         asoc, 0, SCTP_PARAM_RESET_ADD_IN_STREAMS)) {
 626                         /* same process with outstanding isn't 0 */
 627                         result = SCTP_STRRESET_ERR_IN_PROGRESS;
 628                         goto out;
 629                 }
 630
 631                 asoc->strreset_outstanding--;
 632                 asoc->strreset_outseq++;
 633
 634                 if (!asoc->strreset_outstanding) {
 635                         struct sctp_transport *t;
 636
 637                         t = asoc->strreset_chunk->transport;
 638                         if (del_timer(&t->reconf_timer))
 639                                 sctp_transport_put(t);
 640
 641                         sctp_chunk_put(asoc->strreset_chunk);
 642                         asoc->strreset_chunk = NULL;
 643                 }
 644         }
 645
 646         in = ntohs(addstrm->number_of_streams);
 647         incnt = stream->incnt + in;
 648         if (!in || incnt > SCTP_MAX_STREAM)
 649                 goto out;
 650
 651         streamin = krealloc(stream->in, incnt * sizeof(*streamin),
 652                             GFP_ATOMIC);
 653         if (!streamin)
 654                 goto out;
 655
 656         memset(streamin + stream->incnt, 0, in * sizeof(*streamin));
 657         stream->in = streamin;
 658         stream->incnt = incnt;
 659
 660         result = SCTP_STRRESET_PERFORMED;
 661
 662         *evp = sctp_ulpevent_make_stream_change_event(asoc,
 663                 0, ntohs(addstrm->number_of_streams), 0, GFP_ATOMIC);
 664
 665 out:
 666         sctp_update_strreset_result(asoc, result);
 667 err:
 668         return sctp_make_strreset_resp(asoc, result, request_seq);
 669 }
 670
 671 struct sctp_chunk *sctp_process_strreset_addstrm_in(
 672                                 struct sctp_association *asoc,
 673                                 union sctp_params param,
 674                                 struct sctp_ulpevent **evp)
 675 {
 676         struct sctp_strreset_addstrm *addstrm = param.v;
 677         struct sctp_stream *stream = &asoc->stream;
 678         __u32 result = SCTP_STRRESET_DENIED;
 679         struct sctp_stream_out *streamout;
 680         struct sctp_chunk *chunk = NULL;
 681         __u32 request_seq, outcnt;
 682         __u16 out, i;
 683
 684         request_seq = ntohl(addstrm->request_seq);
 685         if (TSN_lt(asoc->strreset_inseq, request_seq) ||
 686             TSN_lt(request_seq, asoc->strreset_inseq - 2)) {
 687                 result = SCTP_STRRESET_ERR_BAD_SEQNO;
 688                 goto err;
 689         } else if (TSN_lt(request_seq, asoc->strreset_inseq)) {
 690                 i = asoc->strreset_inseq - request_seq - 1;
 691                 result = asoc->strreset_result[i];
 692                 if (result == SCTP_STRRESET_PERFORMED)
 693                         return NULL;
 694                 goto err;
 695         }
 696         asoc->strreset_inseq++;
 697
 698         if (!(asoc->strreset_enable & SCTP_ENABLE_CHANGE_ASSOC_REQ))
 699                 goto out;
 700
 701         if (asoc->strreset_outstanding) {
 702                 result = SCTP_STRRESET_ERR_IN_PROGRESS;
 703                 goto out;
 704         }
 705
 706         out = ntohs(addstrm->number_of_streams);
 707         outcnt = stream->outcnt + out;
 708         if (!out || outcnt > SCTP_MAX_STREAM)
 709                 goto out;
 710
 711         streamout = krealloc(stream->out, outcnt * sizeof(*streamout),
 712                              GFP_ATOMIC);
 713         if (!streamout)
 714                 goto out;
 715
 716         memset(streamout + stream->outcnt, 0, out * sizeof(*streamout));
 717         stream->out = streamout;
 718
 719         chunk = sctp_make_strreset_addstrm(asoc, out, 0);
 720         if (!chunk)
 721                 goto out;
 722
 723         asoc->strreset_chunk = chunk;
 724         asoc->strreset_outstanding = 1;
 725         sctp_chunk_hold(asoc->strreset_chunk);
 726
 727         stream->outcnt = outcnt;
 728
 729         result = SCTP_STRRESET_PERFORMED;
 730
 731         *evp = sctp_ulpevent_make_stream_change_event(asoc,
 732                 0, 0, ntohs(addstrm->number_of_streams), GFP_ATOMIC);
 733
 734 out:
 735         sctp_update_strreset_result(asoc, result);
 736 err:
 737         if (!chunk)
 738                 chunk = sctp_make_strreset_resp(asoc, result, request_seq);
 739
 740         return chunk;
 741 }
 742
 743 struct sctp_chunk *sctp_process_strreset_resp(
 744                                 struct sctp_association *asoc,
 745                                 union sctp_params param,
 746                                 struct sctp_ulpevent **evp)
 747 {
 748         struct sctp_stream *stream = &asoc->stream;
 749         struct sctp_strreset_resp *resp = param.v;
 750         struct sctp_transport *t;
 751         __u16 i, nums, flags = 0;
 752         sctp_paramhdr_t *req;
 753         __u32 result;
 754
 755         req = sctp_chunk_lookup_strreset_param(asoc, resp->response_seq, 0);
 756         if (!req)
 757                 return NULL;
 758
 759         result = ntohl(resp->result);
 760         if (result != SCTP_STRRESET_PERFORMED) {
 761                 /* if in progress, do nothing but retransmit */
 762                 if (result == SCTP_STRRESET_IN_PROGRESS)
 763                         return NULL;
 764                 else if (result == SCTP_STRRESET_DENIED)
 765                         flags = SCTP_STREAM_RESET_DENIED;
 766                 else
 767                         flags = SCTP_STREAM_RESET_FAILED;
 768         }
 769
 770         if (req->type == SCTP_PARAM_RESET_OUT_REQUEST) {
 771                 struct sctp_strreset_outreq *outreq;
 772                 __u16 *str_p;
 773
 774                 outreq = (struct sctp_strreset_outreq *)req;
 775                 str_p = outreq->list_of_streams;
 776                 nums = (ntohs(outreq->param_hdr.length) - sizeof(*outreq)) / 2;
 777
 778                 if (result == SCTP_STRRESET_PERFORMED) {
 779                         if (nums) {
 780                                 for (i = 0; i < nums; i++)
 781                                         stream->out[ntohs(str_p[i])].ssn = 0;
 782                         } else {
 783                                 for (i = 0; i < stream->outcnt; i++)
 784                                         stream->out[i].ssn = 0;
 785                         }
 786
 787                         flags = SCTP_STREAM_RESET_OUTGOING_SSN;
 788                 }
 789
 790                 for (i = 0; i < stream->outcnt; i++)
 791                         stream->out[i].state = SCTP_STREAM_OPEN;
 792
 793                 *evp = sctp_ulpevent_make_stream_reset_event(asoc, flags,
 794                         nums, str_p, GFP_ATOMIC);
 795         } else if (req->type == SCTP_PARAM_RESET_IN_REQUEST) {
 796                 struct sctp_strreset_inreq *inreq;
 797                 __u16 *str_p;
 798
 799                 /* if the result is performed, it's impossible for inreq */
 800                 if (result == SCTP_STRRESET_PERFORMED)
 801                         return NULL;
 802
 803                 inreq = (struct sctp_strreset_inreq *)req;
 804                 str_p = inreq->list_of_streams;
 805                 nums = (ntohs(inreq->param_hdr.length) - sizeof(*inreq)) / 2;
 806
 807                 *evp = sctp_ulpevent_make_stream_reset_event(asoc, flags,
 808                         nums, str_p, GFP_ATOMIC);
 809         } else if (req->type == SCTP_PARAM_RESET_TSN_REQUEST) {
 810                 struct sctp_strreset_resptsn *resptsn;
 811                 __u32 stsn, rtsn;
 812
 813                 /* check for resptsn, as sctp_verify_reconf didn't do it*/
 814                 if (ntohs(param.p->length) != sizeof(*resptsn))
 815                         return NULL;
 816
 817                 resptsn = (struct sctp_strreset_resptsn *)resp;
 818                 stsn = ntohl(resptsn->senders_next_tsn);
 819                 rtsn = ntohl(resptsn->receivers_next_tsn);
 820
 821                 if (result == SCTP_STRRESET_PERFORMED) {
 822                         __u32 mtsn = sctp_tsnmap_get_max_tsn_seen(
 823                                                 &asoc->peer.tsn_map);
 824
 825                         sctp_ulpq_reasm_flushtsn(&asoc->ulpq, mtsn);
 826                         sctp_ulpq_abort_pd(&asoc->ulpq, GFP_ATOMIC);
 827
 828                         sctp_tsnmap_init(&asoc->peer.tsn_map,
 829                                          SCTP_TSN_MAP_INITIAL,
 830                                          stsn, GFP_ATOMIC);
 831
 832                         sctp_outq_free(&asoc->outqueue);
 833
 834                         asoc->next_tsn = rtsn;
 835                         asoc->ctsn_ack_point = asoc->next_tsn - 1;
 836                         asoc->adv_peer_ack_point = asoc->ctsn_ack_point;
 837
 838                         for (i = 0; i < stream->outcnt; i++)
 839                                 stream->out[i].ssn = 0;
 840                         for (i = 0; i < stream->incnt; i++)
 841                                 stream->in[i].ssn = 0;
 842                 }
 843
 844                 for (i = 0; i < stream->outcnt; i++)
 845                         stream->out[i].state = SCTP_STREAM_OPEN;
 846
 847                 *evp = sctp_ulpevent_make_assoc_reset_event(asoc, flags,
 848                         stsn, rtsn, GFP_ATOMIC);
 849         } else if (req->type == SCTP_PARAM_RESET_ADD_OUT_STREAMS) {
 850                 struct sctp_strreset_addstrm *addstrm;
 851                 __u16 number;
 852
 853                 addstrm = (struct sctp_strreset_addstrm *)req;
 854                 nums = ntohs(addstrm->number_of_streams);
 855                 number = stream->outcnt - nums;
 856
 857                 if (result == SCTP_STRRESET_PERFORMED)
 858                         for (i = number; i < stream->outcnt; i++)
 859                                 stream->out[i].state = SCTP_STREAM_OPEN;
 860                 else
 861                         stream->outcnt = number;
 862
 863                 *evp = sctp_ulpevent_make_stream_change_event(asoc, flags,
 864                         0, nums, GFP_ATOMIC);
 865         } else if (req->type == SCTP_PARAM_RESET_ADD_IN_STREAMS) {
 866                 struct sctp_strreset_addstrm *addstrm;
 867
 868                 /* if the result is performed, it's impossible for addstrm in
 869                  * request.
 870                  */
 871                 if (result == SCTP_STRRESET_PERFORMED)
 872                         return NULL;
 873
 874                 addstrm = (struct sctp_strreset_addstrm *)req;
 875                 nums = ntohs(addstrm->number_of_streams);
 876
 877                 *evp = sctp_ulpevent_make_stream_change_event(asoc, flags,
 878                         nums, 0, GFP_ATOMIC);
 879         }
 880
 881         asoc->strreset_outstanding--;
 882         asoc->strreset_outseq++;
 883
 884         /* remove everything for this reconf request */
 885         if (!asoc->strreset_outstanding) {
 886                 t = asoc->strreset_chunk->transport;
 887                 if (del_timer(&t->reconf_timer))
 888                         sctp_transport_put(t);
 889
 890                 sctp_chunk_put(asoc->strreset_chunk);
 891                 asoc->strreset_chunk = NULL;
 892         }
 893
 894         return NULL;
 895 }