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