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 static struct flex_array *fa_alloc(size_t elem_size, size_t elem_count,
  41                                    gfp_t gfp)
  42 {
  43         struct flex_array *result;
  44         int err;
  45
  46         result = flex_array_alloc(elem_size, elem_count, gfp);
  47         if (result) {
  48                 err = flex_array_prealloc(result, 0, elem_count, gfp);
  49                 if (err) {
  50                         flex_array_free(result);
  51                         result = NULL;
  52                 }
  53         }
  54
  55         return result;
  56 }
  57
  58 static void fa_free(struct flex_array *fa)
  59 {
  60         if (fa)
  61                 flex_array_free(fa);
  62 }
  63
  64 static void fa_copy(struct flex_array *fa, struct flex_array *from,
  65                     size_t index, size_t count)
  66 {
  67         void *elem;
  68
  69         while (count--) {
  70                 elem = flex_array_get(from, index);
  71                 flex_array_put(fa, index, elem, 0);
  72                 index++;
  73         }
  74 }
  75
  76 static void fa_zero(struct flex_array *fa, size_t index, size_t count)
  77 {
  78         void *elem;
  79
  80         while (count--) {
  81                 elem = flex_array_get(fa, index);
  82                 memset(elem, 0, fa->element_size);
  83                 index++;
  84         }
  85 }
  86
  87 static size_t fa_index(struct flex_array *fa, void *elem, size_t count)
  88 {
  89         size_t index = 0;
  90
  91         while (count--) {
  92                 if (elem == flex_array_get(fa, index))
  93                         break;
  94                 index++;
  95         }
  96
  97         return index;
  98 }
  99
 100 static void sctp_stream_shrink_out(struct sctp_stream *stream, __u16 outcnt)
 101 {
 102         struct sctp_association *asoc;
 103         struct sctp_chunk *ch, *temp;
 104         struct sctp_outq *outq;
 105
 106         asoc = container_of(stream, struct sctp_association, stream);
 107         outq = &asoc->outqueue;
 108
 109         list_for_each_entry_safe(ch, temp, &outq->out_chunk_list, list) {
 110                 __u16 sid = sctp_chunk_stream_no(ch);
 111
 112                 if (sid < outcnt)
 113                         continue;
 114
 115                 sctp_sched_dequeue_common(outq, ch);
 116                 /* No need to call dequeue_done here because
 117                  * the chunks are not scheduled by now.
 118                  */
 119
 120                 /* Mark as failed send. */
 121                 sctp_chunk_fail(ch, (__force __u32)SCTP_ERROR_INV_STRM);
 122                 if (asoc->peer.prsctp_capable &&
 123                     SCTP_PR_PRIO_ENABLED(ch->sinfo.sinfo_flags))
 124                         asoc->sent_cnt_removable--;
 125
 126                 sctp_chunk_free(ch);
 127         }
 128 }
 129
 130 /* Migrates chunks from stream queues to new stream queues if needed,
 131  * but not across associations. Also, removes those chunks to streams
 132  * higher than the new max.
 133  */
 134 static void sctp_stream_outq_migrate(struct sctp_stream *stream,
 135                                      struct sctp_stream *new, __u16 outcnt)
 136 {
 137         int i;
 138
 139         if (stream->outcnt > outcnt)
 140                 sctp_stream_shrink_out(stream, outcnt);
 141
 142         if (new) {
 143                 /* Here we actually move the old ext stuff into the new
 144                  * buffer, because we want to keep it. Then
 145                  * sctp_stream_update will swap ->out pointers.
 146                  */
 147                 for (i = 0; i < outcnt; i++) {
 148                         kfree(SCTP_SO(new, i)->ext);
 149                         SCTP_SO(new, i)->ext = SCTP_SO(stream, i)->ext;
 150                         SCTP_SO(stream, i)->ext = NULL;
 151                 }
 152         }
 153
 154         for (i = outcnt; i < stream->outcnt; i++) {
 155                 kfree(SCTP_SO(stream, i)->ext);
 156                 SCTP_SO(stream, i)->ext = NULL;
 157         }
 158 }
 159
 160 static int sctp_stream_alloc_out(struct sctp_stream *stream, __u16 outcnt,
 161                                  gfp_t gfp)
 162 {
 163         struct flex_array *out;
 164         size_t elem_size = sizeof(struct sctp_stream_out);
 165
 166         out = fa_alloc(elem_size, outcnt, gfp);
 167         if (!out)
 168                 return -ENOMEM;
 169
 170         if (stream->out) {
 171                 fa_copy(out, stream->out, 0, min(outcnt, stream->outcnt));
 172                 if (stream->out_curr) {
 173                         size_t index = fa_index(stream->out, stream->out_curr,
 174                                                 stream->outcnt);
 175
 176                         BUG_ON(index == stream->outcnt);
 177                         stream->out_curr = flex_array_get(out, index);
 178                 }
 179                 fa_free(stream->out);
 180         }
 181
 182         if (outcnt > stream->outcnt)
 183                 fa_zero(out, stream->outcnt, (outcnt - stream->outcnt));
 184
 185         stream->out = out;
 186
 187         return 0;
 188 }
 189
 190 static int sctp_stream_alloc_in(struct sctp_stream *stream, __u16 incnt,
 191                                 gfp_t gfp)
 192 {
 193         struct flex_array *in;
 194         size_t elem_size = sizeof(struct sctp_stream_in);
 195
 196         in = fa_alloc(elem_size, incnt, gfp);
 197         if (!in)
 198                 return -ENOMEM;
 199
 200         if (stream->in) {
 201                 fa_copy(in, stream->in, 0, min(incnt, stream->incnt));
 202                 fa_free(stream->in);
 203         }
 204
 205         if (incnt > stream->incnt)
 206                 fa_zero(in, stream->incnt, (incnt - stream->incnt));
 207
 208         stream->in = in;
 209
 210         return 0;
 211 }
 212
 213 int sctp_stream_init(struct sctp_stream *stream, __u16 outcnt, __u16 incnt,
 214                      gfp_t gfp)
 215 {
 216         struct sctp_sched_ops *sched = sctp_sched_ops_from_stream(stream);
 217         int i, ret = 0;
 218
 219         gfp |= __GFP_NOWARN;
 220
 221         /* Initial stream->out size may be very big, so free it and alloc
 222          * a new one with new outcnt to save memory if needed.
 223          */
 224         if (outcnt == stream->outcnt)
 225                 goto in;
 226
 227         /* Filter out chunks queued on streams that won't exist anymore */
 228         sched->unsched_all(stream);
 229         sctp_stream_outq_migrate(stream, NULL, outcnt);
 230         sched->sched_all(stream);
 231
 232         ret = sctp_stream_alloc_out(stream, outcnt, gfp);
 233         if (ret)
 234                 goto out;
 235
 236         stream->outcnt = outcnt;
 237         for (i = 0; i < stream->outcnt; i++)
 238                 SCTP_SO(stream, i)->state = SCTP_STREAM_OPEN;
 239
 240 in:
 241         sctp_stream_interleave_init(stream);
 242         if (!incnt)
 243                 goto out;
 244
 245         ret = sctp_stream_alloc_in(stream, incnt, gfp);
 246         if (ret) {
 247                 sched->free(stream);
 248                 fa_free(stream->out);
 249                 stream->out = NULL;
 250                 stream->outcnt = 0;
 251                 goto out;
 252         }
 253
 254         stream->incnt = incnt;
 255
 256 out:
 257         return ret;
 258 }
 259
 260 int sctp_stream_init_ext(struct sctp_stream *stream, __u16 sid)
 261 {
 262         struct sctp_stream_out_ext *soute;
 263         int ret;
 264
 265         soute = kzalloc(sizeof(*soute), GFP_KERNEL);
 266         if (!soute)
 267                 return -ENOMEM;
 268         SCTP_SO(stream, sid)->ext = soute;
 269
 270         ret = sctp_sched_init_sid(stream, sid, GFP_KERNEL);
 271         if (ret) {
 272                 kfree(SCTP_SO(stream, sid)->ext);
 273                 SCTP_SO(stream, sid)->ext = NULL;
 274         }
 275
 276         return ret;
 277 }
 278
 279 void sctp_stream_free(struct sctp_stream *stream)
 280 {
 281         struct sctp_sched_ops *sched = sctp_sched_ops_from_stream(stream);
 282         int i;
 283
 284         sched->free(stream);
 285         for (i = 0; i < stream->outcnt; i++)
 286                 kfree(SCTP_SO(stream, i)->ext);
 287         fa_free(stream->out);
 288         fa_free(stream->in);
 289 }
 290
 291 void sctp_stream_clear(struct sctp_stream *stream)
 292 {
 293         int i;
 294
 295         for (i = 0; i < stream->outcnt; i++) {
 296                 SCTP_SO(stream, i)->mid = 0;
 297                 SCTP_SO(stream, i)->mid_uo = 0;
 298         }
 299
 300         for (i = 0; i < stream->incnt; i++)
 301                 SCTP_SI(stream, i)->mid = 0;
 302 }
 303
 304 void sctp_stream_update(struct sctp_stream *stream, struct sctp_stream *new)
 305 {
 306         struct sctp_sched_ops *sched = sctp_sched_ops_from_stream(stream);
 307
 308         sched->unsched_all(stream);
 309         sctp_stream_outq_migrate(stream, new, new->outcnt);
 310         sctp_stream_free(stream);
 311
 312         stream->out = new->out;
 313         stream->in  = new->in;
 314         stream->outcnt = new->outcnt;
 315         stream->incnt  = new->incnt;
 316
 317         sched->sched_all(stream);
 318
 319         new->out = NULL;
 320         new->in  = NULL;
 321         new->outcnt = 0;
 322         new->incnt  = 0;
 323 }
 324
 325 static int sctp_send_reconf(struct sctp_association *asoc,
 326                             struct sctp_chunk *chunk)
 327 {
 328         struct net *net = sock_net(asoc->base.sk);
 329         int retval = 0;
 330
 331         retval = sctp_primitive_RECONF(net, asoc, chunk);
 332         if (retval)
 333                 sctp_chunk_free(chunk);
 334
 335         return retval;
 336 }
 337
 338 static bool sctp_stream_outq_is_empty(struct sctp_stream *stream,
 339                                       __u16 str_nums, __be16 *str_list)
 340 {
 341         struct sctp_association *asoc;
 342         __u16 i;
 343
 344         asoc = container_of(stream, struct sctp_association, stream);
 345         if (!asoc->outqueue.out_qlen)
 346                 return true;
 347
 348         if (!str_nums)
 349                 return false;
 350
 351         for (i = 0; i < str_nums; i++) {
 352                 __u16 sid = ntohs(str_list[i]);
 353
 354                 if (SCTP_SO(stream, sid)->ext &&
 355                     !list_empty(&SCTP_SO(stream, sid)->ext->outq))
 356                         return false;
 357         }
 358
 359         return true;
 360 }
 361
 362 int sctp_send_reset_streams(struct sctp_association *asoc,
 363                             struct sctp_reset_streams *params)
 364 {
 365         struct sctp_stream *stream = &asoc->stream;
 366         __u16 i, str_nums, *str_list;
 367         struct sctp_chunk *chunk;
 368         int retval = -EINVAL;
 369         __be16 *nstr_list;
 370         bool out, in;
 371
 372         if (!asoc->peer.reconf_capable ||
 373             !(asoc->strreset_enable & SCTP_ENABLE_RESET_STREAM_REQ)) {
 374                 retval = -ENOPROTOOPT;
 375                 goto out;
 376         }
 377
 378         if (asoc->strreset_outstanding) {
 379                 retval = -EINPROGRESS;
 380                 goto out;
 381         }
 382
 383         out = params->srs_flags & SCTP_STREAM_RESET_OUTGOING;
 384         in  = params->srs_flags & SCTP_STREAM_RESET_INCOMING;
 385         if (!out && !in)
 386                 goto out;
 387
 388         str_nums = params->srs_number_streams;
 389         str_list = params->srs_stream_list;
 390         if (str_nums) {
 391                 int param_len = 0;
 392
 393                 if (out) {
 394                         for (i = 0; i < str_nums; i++)
 395                                 if (str_list[i] >= stream->outcnt)
 396                                         goto out;
 397
 398                         param_len = str_nums * sizeof(__u16) +
 399                                     sizeof(struct sctp_strreset_outreq);
 400                 }
 401
 402                 if (in) {
 403                         for (i = 0; i < str_nums; i++)
 404                                 if (str_list[i] >= stream->incnt)
 405                                         goto out;
 406
 407                         param_len += str_nums * sizeof(__u16) +
 408                                      sizeof(struct sctp_strreset_inreq);
 409                 }
 410
 411                 if (param_len > SCTP_MAX_CHUNK_LEN -
 412                                 sizeof(struct sctp_reconf_chunk))
 413                         goto out;
 414         }
 415
 416         nstr_list = kcalloc(str_nums, sizeof(__be16), GFP_KERNEL);
 417         if (!nstr_list) {
 418                 retval = -ENOMEM;
 419                 goto out;
 420         }
 421
 422         for (i = 0; i < str_nums; i++)
 423                 nstr_list[i] = htons(str_list[i]);
 424
 425         if (out && !sctp_stream_outq_is_empty(stream, str_nums, nstr_list)) {
 426                 kfree(nstr_list);
 427                 retval = -EAGAIN;
 428                 goto out;
 429         }
 430
 431         chunk = sctp_make_strreset_req(asoc, str_nums, nstr_list, out, in);
 432
 433         kfree(nstr_list);
 434
 435         if (!chunk) {
 436                 retval = -ENOMEM;
 437                 goto out;
 438         }
 439
 440         if (out) {
 441                 if (str_nums)
 442                         for (i = 0; i < str_nums; i++)
 443                                 SCTP_SO(stream, str_list[i])->state =
 444                                                        SCTP_STREAM_CLOSED;
 445                 else
 446                         for (i = 0; i < stream->outcnt; i++)
 447                                 SCTP_SO(stream, i)->state = SCTP_STREAM_CLOSED;
 448         }
 449
 450         asoc->strreset_chunk = chunk;
 451         sctp_chunk_hold(asoc->strreset_chunk);
 452
 453         retval = sctp_send_reconf(asoc, chunk);
 454         if (retval) {
 455                 sctp_chunk_put(asoc->strreset_chunk);
 456                 asoc->strreset_chunk = NULL;
 457                 if (!out)
 458                         goto out;
 459
 460                 if (str_nums)
 461                         for (i = 0; i < str_nums; i++)
 462                                 SCTP_SO(stream, str_list[i])->state =
 463                                                        SCTP_STREAM_OPEN;
 464                 else
 465                         for (i = 0; i < stream->outcnt; i++)
 466                                 SCTP_SO(stream, i)->state = SCTP_STREAM_OPEN;
 467
 468                 goto out;
 469         }
 470
 471         asoc->strreset_outstanding = out + in;
 472
 473 out:
 474         return retval;
 475 }
 476
 477 int sctp_send_reset_assoc(struct sctp_association *asoc)
 478 {
 479         struct sctp_stream *stream = &asoc->stream;
 480         struct sctp_chunk *chunk = NULL;
 481         int retval;
 482         __u16 i;
 483
 484         if (!asoc->peer.reconf_capable ||
 485             !(asoc->strreset_enable & SCTP_ENABLE_RESET_ASSOC_REQ))
 486                 return -ENOPROTOOPT;
 487
 488         if (asoc->strreset_outstanding)
 489                 return -EINPROGRESS;
 490
 491         if (!sctp_outq_is_empty(&asoc->outqueue))
 492                 return -EAGAIN;
 493
 494         chunk = sctp_make_strreset_tsnreq(asoc);
 495         if (!chunk)
 496                 return -ENOMEM;
 497
 498         /* Block further xmit of data until this request is completed */
 499         for (i = 0; i < stream->outcnt; i++)
 500                 SCTP_SO(stream, i)->state = SCTP_STREAM_CLOSED;
 501
 502         asoc->strreset_chunk = chunk;
 503         sctp_chunk_hold(asoc->strreset_chunk);
 504
 505         retval = sctp_send_reconf(asoc, chunk);
 506         if (retval) {
 507                 sctp_chunk_put(asoc->strreset_chunk);
 508                 asoc->strreset_chunk = NULL;
 509
 510                 for (i = 0; i < stream->outcnt; i++)
 511                         SCTP_SO(stream, i)->state = SCTP_STREAM_OPEN;
 512
 513                 return retval;
 514         }
 515
 516         asoc->strreset_outstanding = 1;
 517
 518         return 0;
 519 }
 520
 521 int sctp_send_add_streams(struct sctp_association *asoc,
 522                           struct sctp_add_streams *params)
 523 {
 524         struct sctp_stream *stream = &asoc->stream;
 525         struct sctp_chunk *chunk = NULL;
 526         int retval;
 527         __u32 outcnt, incnt;
 528         __u16 out, in;
 529
 530         if (!asoc->peer.reconf_capable ||
 531             !(asoc->strreset_enable & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
 532                 retval = -ENOPROTOOPT;
 533                 goto out;
 534         }
 535
 536         if (asoc->strreset_outstanding) {
 537                 retval = -EINPROGRESS;
 538                 goto out;
 539         }
 540
 541         out = params->sas_outstrms;
 542         in  = params->sas_instrms;
 543         outcnt = stream->outcnt + out;
 544         incnt = stream->incnt + in;
 545         if (outcnt > SCTP_MAX_STREAM || incnt > SCTP_MAX_STREAM ||
 546             (!out && !in)) {
 547                 retval = -EINVAL;
 548                 goto out;
 549         }
 550
 551         if (out) {
 552                 retval = sctp_stream_alloc_out(stream, outcnt, GFP_KERNEL);
 553                 if (retval)
 554                         goto out;
 555         }
 556
 557         chunk = sctp_make_strreset_addstrm(asoc, out, in);
 558         if (!chunk) {
 559                 retval = -ENOMEM;
 560                 goto out;
 561         }
 562
 563         asoc->strreset_chunk = chunk;
 564         sctp_chunk_hold(asoc->strreset_chunk);
 565
 566         retval = sctp_send_reconf(asoc, chunk);
 567         if (retval) {
 568                 sctp_chunk_put(asoc->strreset_chunk);
 569                 asoc->strreset_chunk = NULL;
 570                 goto out;
 571         }
 572
 573         stream->outcnt = outcnt;
 574
 575         asoc->strreset_outstanding = !!out + !!in;
 576
 577 out:
 578         return retval;
 579 }
 580
 581 static struct sctp_paramhdr *sctp_chunk_lookup_strreset_param(
 582                         struct sctp_association *asoc, __be32 resp_seq,
 583                         __be16 type)
 584 {
 585         struct sctp_chunk *chunk = asoc->strreset_chunk;
 586         struct sctp_reconf_chunk *hdr;
 587         union sctp_params param;
 588
 589         if (!chunk)
 590                 return NULL;
 591
 592         hdr = (struct sctp_reconf_chunk *)chunk->chunk_hdr;
 593         sctp_walk_params(param, hdr, params) {
 594                 /* sctp_strreset_tsnreq is actually the basic structure
 595                  * of all stream reconf params, so it's safe to use it
 596                  * to access request_seq.
 597                  */
 598                 struct sctp_strreset_tsnreq *req = param.v;
 599
 600                 if ((!resp_seq || req->request_seq == resp_seq) &&
 601                     (!type || type == req->param_hdr.type))
 602                         return param.v;
 603         }
 604
 605         return NULL;
 606 }
 607
 608 static void sctp_update_strreset_result(struct sctp_association *asoc,
 609                                         __u32 result)
 610 {
 611         asoc->strreset_result[1] = asoc->strreset_result[0];
 612         asoc->strreset_result[0] = result;
 613 }
 614
 615 struct sctp_chunk *sctp_process_strreset_outreq(
 616                                 struct sctp_association *asoc,
 617                                 union sctp_params param,
 618                                 struct sctp_ulpevent **evp)
 619 {
 620         struct sctp_strreset_outreq *outreq = param.v;
 621         struct sctp_stream *stream = &asoc->stream;
 622         __u32 result = SCTP_STRRESET_DENIED;
 623         __be16 *str_p = NULL;
 624         __u32 request_seq;
 625         __u16 i, nums;
 626
 627         request_seq = ntohl(outreq->request_seq);
 628
 629         if (ntohl(outreq->send_reset_at_tsn) >
 630             sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map)) {
 631                 result = SCTP_STRRESET_IN_PROGRESS;
 632                 goto err;
 633         }
 634
 635         if (TSN_lt(asoc->strreset_inseq, request_seq) ||
 636             TSN_lt(request_seq, asoc->strreset_inseq - 2)) {
 637                 result = SCTP_STRRESET_ERR_BAD_SEQNO;
 638                 goto err;
 639         } else if (TSN_lt(request_seq, asoc->strreset_inseq)) {
 640                 i = asoc->strreset_inseq - request_seq - 1;
 641                 result = asoc->strreset_result[i];
 642                 goto err;
 643         }
 644         asoc->strreset_inseq++;
 645
 646         /* Check strreset_enable after inseq inc, as sender cannot tell
 647          * the peer doesn't enable strreset after receiving response with
 648          * result denied, as well as to keep consistent with bsd.
 649          */
 650         if (!(asoc->strreset_enable & SCTP_ENABLE_RESET_STREAM_REQ))
 651                 goto out;
 652
 653         nums = (ntohs(param.p->length) - sizeof(*outreq)) / sizeof(__u16);
 654         str_p = outreq->list_of_streams;
 655         for (i = 0; i < nums; i++) {
 656                 if (ntohs(str_p[i]) >= stream->incnt) {
 657                         result = SCTP_STRRESET_ERR_WRONG_SSN;
 658                         goto out;
 659                 }
 660         }
 661
 662         if (asoc->strreset_chunk) {
 663                 if (!sctp_chunk_lookup_strreset_param(
 664                                 asoc, outreq->response_seq,
 665                                 SCTP_PARAM_RESET_IN_REQUEST)) {
 666                         /* same process with outstanding isn't 0 */
 667                         result = SCTP_STRRESET_ERR_IN_PROGRESS;
 668                         goto out;
 669                 }
 670
 671                 asoc->strreset_outstanding--;
 672                 asoc->strreset_outseq++;
 673
 674                 if (!asoc->strreset_outstanding) {
 675                         struct sctp_transport *t;
 676
 677                         t = asoc->strreset_chunk->transport;
 678                         if (del_timer(&t->reconf_timer))
 679                                 sctp_transport_put(t);
 680
 681                         sctp_chunk_put(asoc->strreset_chunk);
 682                         asoc->strreset_chunk = NULL;
 683                 }
 684         }
 685
 686         if (nums)
 687                 for (i = 0; i < nums; i++)
 688                         SCTP_SI(stream, ntohs(str_p[i]))->mid = 0;
 689         else
 690                 for (i = 0; i < stream->incnt; i++)
 691                         SCTP_SI(stream, i)->mid = 0;
 692
 693         result = SCTP_STRRESET_PERFORMED;
 694
 695         *evp = sctp_ulpevent_make_stream_reset_event(asoc,
 696                 SCTP_STREAM_RESET_INCOMING_SSN, nums, str_p, GFP_ATOMIC);
 697
 698 out:
 699         sctp_update_strreset_result(asoc, result);
 700 err:
 701         return sctp_make_strreset_resp(asoc, result, request_seq);
 702 }
 703
 704 struct sctp_chunk *sctp_process_strreset_inreq(
 705                                 struct sctp_association *asoc,
 706                                 union sctp_params param,
 707                                 struct sctp_ulpevent **evp)
 708 {
 709         struct sctp_strreset_inreq *inreq = param.v;
 710         struct sctp_stream *stream = &asoc->stream;
 711         __u32 result = SCTP_STRRESET_DENIED;
 712         struct sctp_chunk *chunk = NULL;
 713         __u32 request_seq;
 714         __u16 i, nums;
 715         __be16 *str_p;
 716
 717         request_seq = ntohl(inreq->request_seq);
 718         if (TSN_lt(asoc->strreset_inseq, request_seq) ||
 719             TSN_lt(request_seq, asoc->strreset_inseq - 2)) {
 720                 result = SCTP_STRRESET_ERR_BAD_SEQNO;
 721                 goto err;
 722         } else if (TSN_lt(request_seq, asoc->strreset_inseq)) {
 723                 i = asoc->strreset_inseq - request_seq - 1;
 724                 result = asoc->strreset_result[i];
 725                 if (result == SCTP_STRRESET_PERFORMED)
 726                         return NULL;
 727                 goto err;
 728         }
 729         asoc->strreset_inseq++;
 730
 731         if (!(asoc->strreset_enable & SCTP_ENABLE_RESET_STREAM_REQ))
 732                 goto out;
 733
 734         if (asoc->strreset_outstanding) {
 735                 result = SCTP_STRRESET_ERR_IN_PROGRESS;
 736                 goto out;
 737         }
 738
 739         nums = (ntohs(param.p->length) - sizeof(*inreq)) / sizeof(__u16);
 740         str_p = inreq->list_of_streams;
 741         for (i = 0; i < nums; i++) {
 742                 if (ntohs(str_p[i]) >= stream->outcnt) {
 743                         result = SCTP_STRRESET_ERR_WRONG_SSN;
 744                         goto out;
 745                 }
 746         }
 747
 748         if (!sctp_stream_outq_is_empty(stream, nums, str_p)) {
 749                 result = SCTP_STRRESET_IN_PROGRESS;
 750                 asoc->strreset_inseq--;
 751                 goto err;
 752         }
 753
 754         chunk = sctp_make_strreset_req(asoc, nums, str_p, 1, 0);
 755         if (!chunk)
 756                 goto out;
 757
 758         if (nums)
 759                 for (i = 0; i < nums; i++)
 760                         SCTP_SO(stream, ntohs(str_p[i]))->state =
 761                                                SCTP_STREAM_CLOSED;
 762         else
 763                 for (i = 0; i < stream->outcnt; i++)
 764                         SCTP_SO(stream, i)->state = SCTP_STREAM_CLOSED;
 765
 766         asoc->strreset_chunk = chunk;
 767         asoc->strreset_outstanding = 1;
 768         sctp_chunk_hold(asoc->strreset_chunk);
 769
 770         result = SCTP_STRRESET_PERFORMED;
 771
 772 out:
 773         sctp_update_strreset_result(asoc, result);
 774 err:
 775         if (!chunk)
 776                 chunk =  sctp_make_strreset_resp(asoc, result, request_seq);
 777
 778         return chunk;
 779 }
 780
 781 struct sctp_chunk *sctp_process_strreset_tsnreq(
 782                                 struct sctp_association *asoc,
 783                                 union sctp_params param,
 784                                 struct sctp_ulpevent **evp)
 785 {
 786         __u32 init_tsn = 0, next_tsn = 0, max_tsn_seen;
 787         struct sctp_strreset_tsnreq *tsnreq = param.v;
 788         struct sctp_stream *stream = &asoc->stream;
 789         __u32 result = SCTP_STRRESET_DENIED;
 790         __u32 request_seq;
 791         __u16 i;
 792
 793         request_seq = ntohl(tsnreq->request_seq);
 794         if (TSN_lt(asoc->strreset_inseq, request_seq) ||
 795             TSN_lt(request_seq, asoc->strreset_inseq - 2)) {
 796                 result = SCTP_STRRESET_ERR_BAD_SEQNO;
 797                 goto err;
 798         } else if (TSN_lt(request_seq, asoc->strreset_inseq)) {
 799                 i = asoc->strreset_inseq - request_seq - 1;
 800                 result = asoc->strreset_result[i];
 801                 if (result == SCTP_STRRESET_PERFORMED) {
 802                         next_tsn = asoc->ctsn_ack_point + 1;
 803                         init_tsn =
 804                                 sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map) + 1;
 805                 }
 806                 goto err;
 807         }
 808
 809         if (!sctp_outq_is_empty(&asoc->outqueue)) {
 810                 result = SCTP_STRRESET_IN_PROGRESS;
 811                 goto err;
 812         }
 813
 814         asoc->strreset_inseq++;
 815
 816         if (!(asoc->strreset_enable & SCTP_ENABLE_RESET_ASSOC_REQ))
 817                 goto out;
 818
 819         if (asoc->strreset_outstanding) {
 820                 result = SCTP_STRRESET_ERR_IN_PROGRESS;
 821                 goto out;
 822         }
 823
 824         /* G4: The same processing as though a FWD-TSN chunk (as defined in
 825          *     [RFC3758]) with all streams affected and a new cumulative TSN
 826          *     ACK of the Receiver's Next TSN minus 1 were received MUST be
 827          *     performed.
 828          */
 829         max_tsn_seen = sctp_tsnmap_get_max_tsn_seen(&asoc->peer.tsn_map);
 830         asoc->stream.si->report_ftsn(&asoc->ulpq, max_tsn_seen);
 831
 832         /* G1: Compute an appropriate value for the Receiver's Next TSN -- the
 833          *     TSN that the peer should use to send the next DATA chunk.  The
 834          *     value SHOULD be the smallest TSN not acknowledged by the
 835          *     receiver of the request plus 2^31.
 836          */
 837         init_tsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map) + (1 << 31);
 838         sctp_tsnmap_init(&asoc->peer.tsn_map, SCTP_TSN_MAP_INITIAL,
 839                          init_tsn, GFP_ATOMIC);
 840
 841         /* G3: The same processing as though a SACK chunk with no gap report
 842          *     and a cumulative TSN ACK of the Sender's Next TSN minus 1 were
 843          *     received MUST be performed.
 844          */
 845         sctp_outq_free(&asoc->outqueue);
 846
 847         /* G2: Compute an appropriate value for the local endpoint's next TSN,
 848          *     i.e., the next TSN assigned by the receiver of the SSN/TSN reset
 849          *     chunk.  The value SHOULD be the highest TSN sent by the receiver
 850          *     of the request plus 1.
 851          */
 852         next_tsn = asoc->next_tsn;
 853         asoc->ctsn_ack_point = next_tsn - 1;
 854         asoc->adv_peer_ack_point = asoc->ctsn_ack_point;
 855
 856         /* G5:  The next expected and outgoing SSNs MUST be reset to 0 for all
 857          *      incoming and outgoing streams.
 858          */
 859         for (i = 0; i < stream->outcnt; i++) {
 860                 SCTP_SO(stream, i)->mid = 0;
 861                 SCTP_SO(stream, i)->mid_uo = 0;
 862         }
 863         for (i = 0; i < stream->incnt; i++)
 864                 SCTP_SI(stream, i)->mid = 0;
 865
 866         result = SCTP_STRRESET_PERFORMED;
 867
 868         *evp = sctp_ulpevent_make_assoc_reset_event(asoc, 0, init_tsn,
 869                                                     next_tsn, GFP_ATOMIC);
 870
 871 out:
 872         sctp_update_strreset_result(asoc, result);
 873 err:
 874         return sctp_make_strreset_tsnresp(asoc, result, request_seq,
 875                                           next_tsn, init_tsn);
 876 }
 877
 878 struct sctp_chunk *sctp_process_strreset_addstrm_out(
 879                                 struct sctp_association *asoc,
 880                                 union sctp_params param,
 881                                 struct sctp_ulpevent **evp)
 882 {
 883         struct sctp_strreset_addstrm *addstrm = param.v;
 884         struct sctp_stream *stream = &asoc->stream;
 885         __u32 result = SCTP_STRRESET_DENIED;
 886         __u32 request_seq, incnt;
 887         __u16 in, i;
 888
 889         request_seq = ntohl(addstrm->request_seq);
 890         if (TSN_lt(asoc->strreset_inseq, request_seq) ||
 891             TSN_lt(request_seq, asoc->strreset_inseq - 2)) {
 892                 result = SCTP_STRRESET_ERR_BAD_SEQNO;
 893                 goto err;
 894         } else if (TSN_lt(request_seq, asoc->strreset_inseq)) {
 895                 i = asoc->strreset_inseq - request_seq - 1;
 896                 result = asoc->strreset_result[i];
 897                 goto err;
 898         }
 899         asoc->strreset_inseq++;
 900
 901         if (!(asoc->strreset_enable & SCTP_ENABLE_CHANGE_ASSOC_REQ))
 902                 goto out;
 903
 904         in = ntohs(addstrm->number_of_streams);
 905         incnt = stream->incnt + in;
 906         if (!in || incnt > SCTP_MAX_STREAM)
 907                 goto out;
 908
 909         if (sctp_stream_alloc_in(stream, incnt, GFP_ATOMIC))
 910                 goto out;
 911
 912         if (asoc->strreset_chunk) {
 913                 if (!sctp_chunk_lookup_strreset_param(
 914                         asoc, 0, SCTP_PARAM_RESET_ADD_IN_STREAMS)) {
 915                         /* same process with outstanding isn't 0 */
 916                         result = SCTP_STRRESET_ERR_IN_PROGRESS;
 917                         goto out;
 918                 }
 919
 920                 asoc->strreset_outstanding--;
 921                 asoc->strreset_outseq++;
 922
 923                 if (!asoc->strreset_outstanding) {
 924                         struct sctp_transport *t;
 925
 926                         t = asoc->strreset_chunk->transport;
 927                         if (del_timer(&t->reconf_timer))
 928                                 sctp_transport_put(t);
 929
 930                         sctp_chunk_put(asoc->strreset_chunk);
 931                         asoc->strreset_chunk = NULL;
 932                 }
 933         }
 934
 935         stream->incnt = incnt;
 936
 937         result = SCTP_STRRESET_PERFORMED;
 938
 939         *evp = sctp_ulpevent_make_stream_change_event(asoc,
 940                 0, ntohs(addstrm->number_of_streams), 0, GFP_ATOMIC);
 941
 942 out:
 943         sctp_update_strreset_result(asoc, result);
 944 err:
 945         return sctp_make_strreset_resp(asoc, result, request_seq);
 946 }
 947
 948 struct sctp_chunk *sctp_process_strreset_addstrm_in(
 949                                 struct sctp_association *asoc,
 950                                 union sctp_params param,
 951                                 struct sctp_ulpevent **evp)
 952 {
 953         struct sctp_strreset_addstrm *addstrm = param.v;
 954         struct sctp_stream *stream = &asoc->stream;
 955         __u32 result = SCTP_STRRESET_DENIED;
 956         struct sctp_chunk *chunk = NULL;
 957         __u32 request_seq, outcnt;
 958         __u16 out, i;
 959         int ret;
 960
 961         request_seq = ntohl(addstrm->request_seq);
 962         if (TSN_lt(asoc->strreset_inseq, request_seq) ||
 963             TSN_lt(request_seq, asoc->strreset_inseq - 2)) {
 964                 result = SCTP_STRRESET_ERR_BAD_SEQNO;
 965                 goto err;
 966         } else if (TSN_lt(request_seq, asoc->strreset_inseq)) {
 967                 i = asoc->strreset_inseq - request_seq - 1;
 968                 result = asoc->strreset_result[i];
 969                 if (result == SCTP_STRRESET_PERFORMED)
 970                         return NULL;
 971                 goto err;
 972         }
 973         asoc->strreset_inseq++;
 974
 975         if (!(asoc->strreset_enable & SCTP_ENABLE_CHANGE_ASSOC_REQ))
 976                 goto out;
 977
 978         if (asoc->strreset_outstanding) {
 979                 result = SCTP_STRRESET_ERR_IN_PROGRESS;
 980                 goto out;
 981         }
 982
 983         out = ntohs(addstrm->number_of_streams);
 984         outcnt = stream->outcnt + out;
 985         if (!out || outcnt > SCTP_MAX_STREAM)
 986                 goto out;
 987
 988         ret = sctp_stream_alloc_out(stream, outcnt, GFP_ATOMIC);
 989         if (ret)
 990                 goto out;
 991
 992         chunk = sctp_make_strreset_addstrm(asoc, out, 0);
 993         if (!chunk)
 994                 goto out;
 995
 996         asoc->strreset_chunk = chunk;
 997         asoc->strreset_outstanding = 1;
 998         sctp_chunk_hold(asoc->strreset_chunk);
 999
1000         stream->outcnt = outcnt;
1001
1002         result = SCTP_STRRESET_PERFORMED;
1003
1004 out:
1005         sctp_update_strreset_result(asoc, result);
1006 err:
1007         if (!chunk)
1008                 chunk = sctp_make_strreset_resp(asoc, result, request_seq);
1009
1010         return chunk;
1011 }
1012
1013 struct sctp_chunk *sctp_process_strreset_resp(
1014                                 struct sctp_association *asoc,
1015                                 union sctp_params param,
1016                                 struct sctp_ulpevent **evp)
1017 {
1018         struct sctp_stream *stream = &asoc->stream;
1019         struct sctp_strreset_resp *resp = param.v;
1020         struct sctp_transport *t;
1021         __u16 i, nums, flags = 0;
1022         struct sctp_paramhdr *req;
1023         __u32 result;
1024
1025         req = sctp_chunk_lookup_strreset_param(asoc, resp->response_seq, 0);
1026         if (!req)
1027                 return NULL;
1028
1029         result = ntohl(resp->result);
1030         if (result != SCTP_STRRESET_PERFORMED) {
1031                 /* if in progress, do nothing but retransmit */
1032                 if (result == SCTP_STRRESET_IN_PROGRESS)
1033                         return NULL;
1034                 else if (result == SCTP_STRRESET_DENIED)
1035                         flags = SCTP_STREAM_RESET_DENIED;
1036                 else
1037                         flags = SCTP_STREAM_RESET_FAILED;
1038         }
1039
1040         if (req->type == SCTP_PARAM_RESET_OUT_REQUEST) {
1041                 struct sctp_strreset_outreq *outreq;
1042                 __be16 *str_p;
1043
1044                 outreq = (struct sctp_strreset_outreq *)req;
1045                 str_p = outreq->list_of_streams;
1046                 nums = (ntohs(outreq->param_hdr.length) - sizeof(*outreq)) /
1047                        sizeof(__u16);
1048
1049                 if (result == SCTP_STRRESET_PERFORMED) {
1050                         struct sctp_stream_out *sout;
1051                         if (nums) {
1052                                 for (i = 0; i < nums; i++) {
1053                                         sout = SCTP_SO(stream, ntohs(str_p[i]));
1054                                         sout->mid = 0;
1055                                         sout->mid_uo = 0;
1056                                 }
1057                         } else {
1058                                 for (i = 0; i < stream->outcnt; i++) {
1059                                         sout = SCTP_SO(stream, i);
1060                                         sout->mid = 0;
1061                                         sout->mid_uo = 0;
1062                                 }
1063                         }
1064                 }
1065
1066                 flags |= SCTP_STREAM_RESET_OUTGOING_SSN;
1067
1068                 for (i = 0; i < stream->outcnt; i++)
1069                         SCTP_SO(stream, i)->state = SCTP_STREAM_OPEN;
1070
1071                 *evp = sctp_ulpevent_make_stream_reset_event(asoc, flags,
1072                         nums, str_p, GFP_ATOMIC);
1073         } else if (req->type == SCTP_PARAM_RESET_IN_REQUEST) {
1074                 struct sctp_strreset_inreq *inreq;
1075                 __be16 *str_p;
1076
1077                 /* if the result is performed, it's impossible for inreq */
1078                 if (result == SCTP_STRRESET_PERFORMED)
1079                         return NULL;
1080
1081                 inreq = (struct sctp_strreset_inreq *)req;
1082                 str_p = inreq->list_of_streams;
1083                 nums = (ntohs(inreq->param_hdr.length) - sizeof(*inreq)) /
1084                        sizeof(__u16);
1085
1086                 flags |= SCTP_STREAM_RESET_INCOMING_SSN;
1087
1088                 *evp = sctp_ulpevent_make_stream_reset_event(asoc, flags,
1089                         nums, str_p, GFP_ATOMIC);
1090         } else if (req->type == SCTP_PARAM_RESET_TSN_REQUEST) {
1091                 struct sctp_strreset_resptsn *resptsn;
1092                 __u32 stsn, rtsn;
1093
1094                 /* check for resptsn, as sctp_verify_reconf didn't do it*/
1095                 if (ntohs(param.p->length) != sizeof(*resptsn))
1096                         return NULL;
1097
1098                 resptsn = (struct sctp_strreset_resptsn *)resp;
1099                 stsn = ntohl(resptsn->senders_next_tsn);
1100                 rtsn = ntohl(resptsn->receivers_next_tsn);
1101
1102                 if (result == SCTP_STRRESET_PERFORMED) {
1103                         __u32 mtsn = sctp_tsnmap_get_max_tsn_seen(
1104                                                 &asoc->peer.tsn_map);
1105                         LIST_HEAD(temp);
1106
1107                         asoc->stream.si->report_ftsn(&asoc->ulpq, mtsn);
1108
1109                         sctp_tsnmap_init(&asoc->peer.tsn_map,
1110                                          SCTP_TSN_MAP_INITIAL,
1111                                          stsn, GFP_ATOMIC);
1112
1113                         /* Clean up sacked and abandoned queues only. As the
1114                          * out_chunk_list may not be empty, splice it to temp,
1115                          * then get it back after sctp_outq_free is done.
1116                          */
1117                         list_splice_init(&asoc->outqueue.out_chunk_list, &temp);
1118                         sctp_outq_free(&asoc->outqueue);
1119                         list_splice_init(&temp, &asoc->outqueue.out_chunk_list);
1120
1121                         asoc->next_tsn = rtsn;
1122                         asoc->ctsn_ack_point = asoc->next_tsn - 1;
1123                         asoc->adv_peer_ack_point = asoc->ctsn_ack_point;
1124
1125                         for (i = 0; i < stream->outcnt; i++) {
1126                                 SCTP_SO(stream, i)->mid = 0;
1127                                 SCTP_SO(stream, i)->mid_uo = 0;
1128                         }
1129                         for (i = 0; i < stream->incnt; i++)
1130                                 SCTP_SI(stream, i)->mid = 0;
1131                 }
1132
1133                 for (i = 0; i < stream->outcnt; i++)
1134                         SCTP_SO(stream, i)->state = SCTP_STREAM_OPEN;
1135
1136                 *evp = sctp_ulpevent_make_assoc_reset_event(asoc, flags,
1137                         stsn, rtsn, GFP_ATOMIC);
1138         } else if (req->type == SCTP_PARAM_RESET_ADD_OUT_STREAMS) {
1139                 struct sctp_strreset_addstrm *addstrm;
1140                 __u16 number;
1141
1142                 addstrm = (struct sctp_strreset_addstrm *)req;
1143                 nums = ntohs(addstrm->number_of_streams);
1144                 number = stream->outcnt - nums;
1145
1146                 if (result == SCTP_STRRESET_PERFORMED) {
1147                         for (i = number; i < stream->outcnt; i++)
1148                                 SCTP_SO(stream, i)->state = SCTP_STREAM_OPEN;
1149                 } else {
1150                         sctp_stream_shrink_out(stream, number);
1151                         stream->outcnt = number;
1152                 }
1153
1154                 *evp = sctp_ulpevent_make_stream_change_event(asoc, flags,
1155                         0, nums, GFP_ATOMIC);
1156         } else if (req->type == SCTP_PARAM_RESET_ADD_IN_STREAMS) {
1157                 struct sctp_strreset_addstrm *addstrm;
1158
1159                 /* if the result is performed, it's impossible for addstrm in
1160                  * request.
1161                  */
1162                 if (result == SCTP_STRRESET_PERFORMED)
1163                         return NULL;
1164
1165                 addstrm = (struct sctp_strreset_addstrm *)req;
1166                 nums = ntohs(addstrm->number_of_streams);
1167
1168                 *evp = sctp_ulpevent_make_stream_change_event(asoc, flags,
1169                         nums, 0, GFP_ATOMIC);
1170         }
1171
1172         asoc->strreset_outstanding--;
1173         asoc->strreset_outseq++;
1174
1175         /* remove everything for this reconf request */
1176         if (!asoc->strreset_outstanding) {
1177                 t = asoc->strreset_chunk->transport;
1178                 if (del_timer(&t->reconf_timer))
1179                         sctp_transport_put(t);
1180
1181                 sctp_chunk_put(asoc->strreset_chunk);
1182                 asoc->strreset_chunk = NULL;
1183         }
1184
1185         return NULL;
1186 }