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 <linux/list.h> 36 #include <net/sctp/sctp.h> 37 #include <net/sctp/sm.h> 38 #include <net/sctp/stream_sched.h> 39 40 /* Migrates chunks from stream queues to new stream queues if needed, 41 * but not across associations. Also, removes those chunks to streams 42 * higher than the new max. 43 */ 44 static void sctp_stream_outq_migrate(struct sctp_stream *stream, 45 struct sctp_stream *new, __u16 outcnt) 46 { 47 struct sctp_association *asoc; 48 struct sctp_chunk *ch, *temp; 49 struct sctp_outq *outq; 50 int i; 51 52 asoc = container_of(stream, struct sctp_association, stream); 53 outq = &asoc->outqueue; 54 55 list_for_each_entry_safe(ch, temp, &outq->out_chunk_list, list) { 56 __u16 sid = sctp_chunk_stream_no(ch); 57 58 if (sid < outcnt) 59 continue; 60 61 sctp_sched_dequeue_common(outq, ch); 62 /* No need to call dequeue_done here because 63 * the chunks are not scheduled by now. 64 */ 65 66 /* Mark as failed send. */ 67 sctp_chunk_fail(ch, SCTP_ERROR_INV_STRM); 68 if (asoc->peer.prsctp_capable && 69 SCTP_PR_PRIO_ENABLED(ch->sinfo.sinfo_flags)) 70 asoc->sent_cnt_removable--; 71 72 sctp_chunk_free(ch); 73 } 74 75 if (new) { 76 /* Here we actually move the old ext stuff into the new 77 * buffer, because we want to keep it. Then 78 * sctp_stream_update will swap ->out pointers. 79 */ 80 for (i = 0; i < outcnt; i++) { 81 kfree(new->out[i].ext); 82 new->out[i].ext = stream->out[i].ext; 83 stream->out[i].ext = NULL; 84 } 85 } 86 87 for (i = outcnt; i < stream->outcnt; i++) 88 kfree(stream->out[i].ext); 89 } 90 91 static int sctp_stream_alloc_out(struct sctp_stream *stream, __u16 outcnt, 92 gfp_t gfp) 93 { 94 struct sctp_stream_out *out; 95 96 out = kmalloc_array(outcnt, sizeof(*out), gfp); 97 if (!out) 98 return -ENOMEM; 99 100 if (stream->out) { 101 memcpy(out, stream->out, min(outcnt, stream->outcnt) * 102 sizeof(*out)); 103 kfree(stream->out); 104 } 105 106 if (outcnt > stream->outcnt) 107 memset(out + stream->outcnt, 0, 108 (outcnt - stream->outcnt) * sizeof(*out)); 109 110 stream->out = out; 111 112 return 0; 113 } 114 115 static int sctp_stream_alloc_in(struct sctp_stream *stream, __u16 incnt, 116 gfp_t gfp) 117 { 118 struct sctp_stream_in *in; 119 120 in = kmalloc_array(incnt, sizeof(*stream->in), gfp); 121 122 if (!in) 123 return -ENOMEM; 124 125 if (stream->in) { 126 memcpy(in, stream->in, min(incnt, stream->incnt) * 127 sizeof(*in)); 128 kfree(stream->in); 129 } 130 131 if (incnt > stream->incnt) 132 memset(in + stream->incnt, 0, 133 (incnt - stream->incnt) * sizeof(*in)); 134 135 stream->in = in; 136 137 return 0; 138 } 139 140 int sctp_stream_init(struct sctp_stream *stream, __u16 outcnt, __u16 incnt, 141 gfp_t gfp) 142 { 143 struct sctp_sched_ops *sched = sctp_sched_ops_from_stream(stream); 144 int i, ret = 0; 145 146 gfp |= __GFP_NOWARN; 147 148 /* Initial stream->out size may be very big, so free it and alloc 149 * a new one with new outcnt to save memory if needed. 150 */ 151 if (outcnt == stream->outcnt) 152 goto in; 153 154 /* Filter out chunks queued on streams that won't exist anymore */ 155 sched->unsched_all(stream); 156 sctp_stream_outq_migrate(stream, NULL, outcnt); 157 sched->sched_all(stream); 158 159 i = sctp_stream_alloc_out(stream, outcnt, gfp); 160 if (i) 161 return i; 162 163 stream->outcnt = outcnt; 164 for (i = 0; i < stream->outcnt; i++) 165 stream->out[i].state = SCTP_STREAM_OPEN; 166 167 sched->init(stream); 168 169 in: 170 if (!incnt) 171 goto out; 172 173 i = sctp_stream_alloc_in(stream, incnt, gfp); 174 if (i) { 175 ret = -ENOMEM; 176 goto free; 177 } 178 179 stream->incnt = incnt; 180 goto out; 181 182 free: 183 sched->free(stream); 184 kfree(stream->out); 185 stream->out = NULL; 186 out: 187 return ret; 188 } 189 190 int sctp_stream_init_ext(struct sctp_stream *stream, __u16 sid) 191 { 192 struct sctp_stream_out_ext *soute; 193 194 soute = kzalloc(sizeof(*soute), GFP_KERNEL); 195 if (!soute) 196 return -ENOMEM; 197 stream->out[sid].ext = soute; 198 199 return sctp_sched_init_sid(stream, sid, GFP_KERNEL); 200 } 201 202 void sctp_stream_free(struct sctp_stream *stream) 203 { 204 struct sctp_sched_ops *sched = sctp_sched_ops_from_stream(stream); 205 int i; 206 207 sched->free(stream); 208 for (i = 0; i < stream->outcnt; i++) 209 kfree(stream->out[i].ext); 210 kfree(stream->out); 211 kfree(stream->in); 212 } 213 214 void sctp_stream_clear(struct sctp_stream *stream) 215 { 216 int i; 217 218 for (i = 0; i < stream->outcnt; i++) 219 stream->out[i].ssn = 0; 220 221 for (i = 0; i < stream->incnt; i++) 222 stream->in[i].ssn = 0; 223 } 224 225 void sctp_stream_update(struct sctp_stream *stream, struct sctp_stream *new) 226 { 227 struct sctp_sched_ops *sched = sctp_sched_ops_from_stream(stream); 228 229 sched->unsched_all(stream); 230 sctp_stream_outq_migrate(stream, new, new->outcnt); 231 sctp_stream_free(stream); 232 233 stream->out = new->out; 234 stream->in = new->in; 235 stream->outcnt = new->outcnt; 236 stream->incnt = new->incnt; 237 238 sched->sched_all(stream); 239 240 new->out = NULL; 241 new->in = NULL; 242 } 243 244 static int sctp_send_reconf(struct sctp_association *asoc, 245 struct sctp_chunk *chunk) 246 { 247 struct net *net = sock_net(asoc->base.sk); 248 int retval = 0; 249 250 retval = sctp_primitive_RECONF(net, asoc, chunk); 251 if (retval) 252 sctp_chunk_free(chunk); 253 254 return retval; 255 } 256 257 int sctp_send_reset_streams(struct sctp_association *asoc, 258 struct sctp_reset_streams *params) 259 { 260 struct sctp_stream *stream = &asoc->stream; 261 __u16 i, str_nums, *str_list; 262 struct sctp_chunk *chunk; 263 int retval = -EINVAL; 264 __be16 *nstr_list; 265 bool out, in; 266 267 if (!asoc->peer.reconf_capable || 268 !(asoc->strreset_enable & SCTP_ENABLE_RESET_STREAM_REQ)) { 269 retval = -ENOPROTOOPT; 270 goto out; 271 } 272 273 if (asoc->strreset_outstanding) { 274 retval = -EINPROGRESS; 275 goto out; 276 } 277 278 out = params->srs_flags & SCTP_STREAM_RESET_OUTGOING; 279 in = params->srs_flags & SCTP_STREAM_RESET_INCOMING; 280 if (!out && !in) 281 goto out; 282 283 str_nums = params->srs_number_streams; 284 str_list = params->srs_stream_list; 285 if (out && str_nums) 286 for (i = 0; i < str_nums; i++) 287 if (str_list[i] >= stream->outcnt) 288 goto out; 289 290 if (in && str_nums) 291 for (i = 0; i < str_nums; i++) 292 if (str_list[i] >= stream->incnt) 293 goto out; 294 295 nstr_list = kcalloc(str_nums, sizeof(__be16), GFP_KERNEL); 296 if (!nstr_list) { 297 retval = -ENOMEM; 298 goto out; 299 } 300 301 for (i = 0; i < str_nums; i++) 302 nstr_list[i] = htons(str_list[i]); 303 304 chunk = sctp_make_strreset_req(asoc, str_nums, nstr_list, out, in); 305 306 kfree(nstr_list); 307 308 if (!chunk) { 309 retval = -ENOMEM; 310 goto out; 311 } 312 313 if (out) { 314 if (str_nums) 315 for (i = 0; i < str_nums; i++) 316 stream->out[str_list[i]].state = 317 SCTP_STREAM_CLOSED; 318 else 319 for (i = 0; i < stream->outcnt; i++) 320 stream->out[i].state = SCTP_STREAM_CLOSED; 321 } 322 323 asoc->strreset_chunk = chunk; 324 sctp_chunk_hold(asoc->strreset_chunk); 325 326 retval = sctp_send_reconf(asoc, chunk); 327 if (retval) { 328 sctp_chunk_put(asoc->strreset_chunk); 329 asoc->strreset_chunk = NULL; 330 if (!out) 331 goto out; 332 333 if (str_nums) 334 for (i = 0; i < str_nums; i++) 335 stream->out[str_list[i]].state = 336 SCTP_STREAM_OPEN; 337 else 338 for (i = 0; i < stream->outcnt; i++) 339 stream->out[i].state = SCTP_STREAM_OPEN; 340 341 goto out; 342 } 343 344 asoc->strreset_outstanding = out + in; 345 346 out: 347 return retval; 348 } 349 350 int sctp_send_reset_assoc(struct sctp_association *asoc) 351 { 352 struct sctp_stream *stream = &asoc->stream; 353 struct sctp_chunk *chunk = NULL; 354 int retval; 355 __u16 i; 356 357 if (!asoc->peer.reconf_capable || 358 !(asoc->strreset_enable & SCTP_ENABLE_RESET_ASSOC_REQ)) 359 return -ENOPROTOOPT; 360 361 if (asoc->strreset_outstanding) 362 return -EINPROGRESS; 363 364 chunk = sctp_make_strreset_tsnreq(asoc); 365 if (!chunk) 366 return -ENOMEM; 367 368 /* Block further xmit of data until this request is completed */ 369 for (i = 0; i < stream->outcnt; i++) 370 stream->out[i].state = SCTP_STREAM_CLOSED; 371 372 asoc->strreset_chunk = chunk; 373 sctp_chunk_hold(asoc->strreset_chunk); 374 375 retval = sctp_send_reconf(asoc, chunk); 376 if (retval) { 377 sctp_chunk_put(asoc->strreset_chunk); 378 asoc->strreset_chunk = NULL; 379 380 for (i = 0; i < stream->outcnt; i++) 381 stream->out[i].state = SCTP_STREAM_OPEN; 382 383 return retval; 384 } 385 386 asoc->strreset_outstanding = 1; 387 388 return 0; 389 } 390 391 int sctp_send_add_streams(struct sctp_association *asoc, 392 struct sctp_add_streams *params) 393 { 394 struct sctp_stream *stream = &asoc->stream; 395 struct sctp_chunk *chunk = NULL; 396 int retval; 397 __u32 outcnt, incnt; 398 __u16 out, in; 399 400 if (!asoc->peer.reconf_capable || 401 !(asoc->strreset_enable & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 402 retval = -ENOPROTOOPT; 403 goto out; 404 } 405 406 if (asoc->strreset_outstanding) { 407 retval = -EINPROGRESS; 408 goto out; 409 } 410 411 out = params->sas_outstrms; 412 in = params->sas_instrms; 413 outcnt = stream->outcnt + out; 414 incnt = stream->incnt + in; 415 if (outcnt > SCTP_MAX_STREAM || incnt > SCTP_MAX_STREAM || 416 (!out && !in)) { 417 retval = -EINVAL; 418 goto out; 419 } 420 421 if (out) { 422 retval = sctp_stream_alloc_out(stream, outcnt, GFP_KERNEL); 423 if (retval) 424 goto out; 425 } 426 427 chunk = sctp_make_strreset_addstrm(asoc, out, in); 428 if (!chunk) { 429 retval = -ENOMEM; 430 goto out; 431 } 432 433 asoc->strreset_chunk = chunk; 434 sctp_chunk_hold(asoc->strreset_chunk); 435 436 retval = sctp_send_reconf(asoc, chunk); 437 if (retval) { 438 sctp_chunk_put(asoc->strreset_chunk); 439 asoc->strreset_chunk = NULL; 440 goto out; 441 } 442 443 stream->incnt = incnt; 444 stream->outcnt = outcnt; 445 446 asoc->strreset_outstanding = !!out + !!in; 447 448 out: 449 return retval; 450 } 451 452 static struct sctp_paramhdr *sctp_chunk_lookup_strreset_param( 453 struct sctp_association *asoc, __be32 resp_seq, 454 __be16 type) 455 { 456 struct sctp_chunk *chunk = asoc->strreset_chunk; 457 struct sctp_reconf_chunk *hdr; 458 union sctp_params param; 459 460 if (!chunk) 461 return NULL; 462 463 hdr = (struct sctp_reconf_chunk *)chunk->chunk_hdr; 464 sctp_walk_params(param, hdr, params) { 465 /* sctp_strreset_tsnreq is actually the basic structure 466 * of all stream reconf params, so it's safe to use it 467 * to access request_seq. 468 */ 469 struct sctp_strreset_tsnreq *req = param.v; 470 471 if ((!resp_seq || req->request_seq == resp_seq) && 472 (!type || type == req->param_hdr.type)) 473 return param.v; 474 } 475 476 return NULL; 477 } 478 479 static void sctp_update_strreset_result(struct sctp_association *asoc, 480 __u32 result) 481 { 482 asoc->strreset_result[1] = asoc->strreset_result[0]; 483 asoc->strreset_result[0] = result; 484 } 485 486 struct sctp_chunk *sctp_process_strreset_outreq( 487 struct sctp_association *asoc, 488 union sctp_params param, 489 struct sctp_ulpevent **evp) 490 { 491 struct sctp_strreset_outreq *outreq = param.v; 492 struct sctp_stream *stream = &asoc->stream; 493 __u32 result = SCTP_STRRESET_DENIED; 494 __u16 i, nums, flags = 0; 495 __be16 *str_p = NULL; 496 __u32 request_seq; 497 498 request_seq = ntohl(outreq->request_seq); 499 500 if (ntohl(outreq->send_reset_at_tsn) > 501 sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map)) { 502 result = SCTP_STRRESET_IN_PROGRESS; 503 goto err; 504 } 505 506 if (TSN_lt(asoc->strreset_inseq, request_seq) || 507 TSN_lt(request_seq, asoc->strreset_inseq - 2)) { 508 result = SCTP_STRRESET_ERR_BAD_SEQNO; 509 goto err; 510 } else if (TSN_lt(request_seq, asoc->strreset_inseq)) { 511 i = asoc->strreset_inseq - request_seq - 1; 512 result = asoc->strreset_result[i]; 513 goto err; 514 } 515 asoc->strreset_inseq++; 516 517 /* Check strreset_enable after inseq inc, as sender cannot tell 518 * the peer doesn't enable strreset after receiving response with 519 * result denied, as well as to keep consistent with bsd. 520 */ 521 if (!(asoc->strreset_enable & SCTP_ENABLE_RESET_STREAM_REQ)) 522 goto out; 523 524 if (asoc->strreset_chunk) { 525 if (!sctp_chunk_lookup_strreset_param( 526 asoc, outreq->response_seq, 527 SCTP_PARAM_RESET_IN_REQUEST)) { 528 /* same process with outstanding isn't 0 */ 529 result = SCTP_STRRESET_ERR_IN_PROGRESS; 530 goto out; 531 } 532 533 asoc->strreset_outstanding--; 534 asoc->strreset_outseq++; 535 536 if (!asoc->strreset_outstanding) { 537 struct sctp_transport *t; 538 539 t = asoc->strreset_chunk->transport; 540 if (del_timer(&t->reconf_timer)) 541 sctp_transport_put(t); 542 543 sctp_chunk_put(asoc->strreset_chunk); 544 asoc->strreset_chunk = NULL; 545 } 546 547 flags = SCTP_STREAM_RESET_INCOMING_SSN; 548 } 549 550 nums = (ntohs(param.p->length) - sizeof(*outreq)) / 2; 551 if (nums) { 552 str_p = outreq->list_of_streams; 553 for (i = 0; i < nums; i++) { 554 if (ntohs(str_p[i]) >= stream->incnt) { 555 result = SCTP_STRRESET_ERR_WRONG_SSN; 556 goto out; 557 } 558 } 559 560 for (i = 0; i < nums; i++) 561 stream->in[ntohs(str_p[i])].ssn = 0; 562 } else { 563 for (i = 0; i < stream->incnt; i++) 564 stream->in[i].ssn = 0; 565 } 566 567 result = SCTP_STRRESET_PERFORMED; 568 569 *evp = sctp_ulpevent_make_stream_reset_event(asoc, 570 flags | SCTP_STREAM_RESET_OUTGOING_SSN, nums, str_p, 571 GFP_ATOMIC); 572 573 out: 574 sctp_update_strreset_result(asoc, result); 575 err: 576 return sctp_make_strreset_resp(asoc, result, request_seq); 577 } 578 579 struct sctp_chunk *sctp_process_strreset_inreq( 580 struct sctp_association *asoc, 581 union sctp_params param, 582 struct sctp_ulpevent **evp) 583 { 584 struct sctp_strreset_inreq *inreq = param.v; 585 struct sctp_stream *stream = &asoc->stream; 586 __u32 result = SCTP_STRRESET_DENIED; 587 struct sctp_chunk *chunk = NULL; 588 __u32 request_seq; 589 __u16 i, nums; 590 __be16 *str_p; 591 592 request_seq = ntohl(inreq->request_seq); 593 if (TSN_lt(asoc->strreset_inseq, request_seq) || 594 TSN_lt(request_seq, asoc->strreset_inseq - 2)) { 595 result = SCTP_STRRESET_ERR_BAD_SEQNO; 596 goto err; 597 } else if (TSN_lt(request_seq, asoc->strreset_inseq)) { 598 i = asoc->strreset_inseq - request_seq - 1; 599 result = asoc->strreset_result[i]; 600 if (result == SCTP_STRRESET_PERFORMED) 601 return NULL; 602 goto err; 603 } 604 asoc->strreset_inseq++; 605 606 if (!(asoc->strreset_enable & SCTP_ENABLE_RESET_STREAM_REQ)) 607 goto out; 608 609 if (asoc->strreset_outstanding) { 610 result = SCTP_STRRESET_ERR_IN_PROGRESS; 611 goto out; 612 } 613 614 nums = (ntohs(param.p->length) - sizeof(*inreq)) / 2; 615 str_p = inreq->list_of_streams; 616 for (i = 0; i < nums; i++) { 617 if (ntohs(str_p[i]) >= stream->outcnt) { 618 result = SCTP_STRRESET_ERR_WRONG_SSN; 619 goto out; 620 } 621 } 622 623 chunk = sctp_make_strreset_req(asoc, nums, str_p, 1, 0); 624 if (!chunk) 625 goto out; 626 627 if (nums) 628 for (i = 0; i < nums; i++) 629 stream->out[ntohs(str_p[i])].state = 630 SCTP_STREAM_CLOSED; 631 else 632 for (i = 0; i < stream->outcnt; i++) 633 stream->out[i].state = SCTP_STREAM_CLOSED; 634 635 asoc->strreset_chunk = chunk; 636 asoc->strreset_outstanding = 1; 637 sctp_chunk_hold(asoc->strreset_chunk); 638 639 result = SCTP_STRRESET_PERFORMED; 640 641 *evp = sctp_ulpevent_make_stream_reset_event(asoc, 642 SCTP_STREAM_RESET_INCOMING_SSN, nums, str_p, GFP_ATOMIC); 643 644 out: 645 sctp_update_strreset_result(asoc, result); 646 err: 647 if (!chunk) 648 chunk = sctp_make_strreset_resp(asoc, result, request_seq); 649 650 return chunk; 651 } 652 653 struct sctp_chunk *sctp_process_strreset_tsnreq( 654 struct sctp_association *asoc, 655 union sctp_params param, 656 struct sctp_ulpevent **evp) 657 { 658 __u32 init_tsn = 0, next_tsn = 0, max_tsn_seen; 659 struct sctp_strreset_tsnreq *tsnreq = param.v; 660 struct sctp_stream *stream = &asoc->stream; 661 __u32 result = SCTP_STRRESET_DENIED; 662 __u32 request_seq; 663 __u16 i; 664 665 request_seq = ntohl(tsnreq->request_seq); 666 if (TSN_lt(asoc->strreset_inseq, request_seq) || 667 TSN_lt(request_seq, asoc->strreset_inseq - 2)) { 668 result = SCTP_STRRESET_ERR_BAD_SEQNO; 669 goto err; 670 } else if (TSN_lt(request_seq, asoc->strreset_inseq)) { 671 i = asoc->strreset_inseq - request_seq - 1; 672 result = asoc->strreset_result[i]; 673 if (result == SCTP_STRRESET_PERFORMED) { 674 next_tsn = asoc->next_tsn; 675 init_tsn = 676 sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map) + 1; 677 } 678 goto err; 679 } 680 asoc->strreset_inseq++; 681 682 if (!(asoc->strreset_enable & SCTP_ENABLE_RESET_ASSOC_REQ)) 683 goto out; 684 685 if (asoc->strreset_outstanding) { 686 result = SCTP_STRRESET_ERR_IN_PROGRESS; 687 goto out; 688 } 689 690 /* G3: The same processing as though a SACK chunk with no gap report 691 * and a cumulative TSN ACK of the Sender's Next TSN minus 1 were 692 * received MUST be performed. 693 */ 694 max_tsn_seen = sctp_tsnmap_get_max_tsn_seen(&asoc->peer.tsn_map); 695 sctp_ulpq_reasm_flushtsn(&asoc->ulpq, max_tsn_seen); 696 sctp_ulpq_abort_pd(&asoc->ulpq, GFP_ATOMIC); 697 698 /* G1: Compute an appropriate value for the Receiver's Next TSN -- the 699 * TSN that the peer should use to send the next DATA chunk. The 700 * value SHOULD be the smallest TSN not acknowledged by the 701 * receiver of the request plus 2^31. 702 */ 703 init_tsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map) + (1 << 31); 704 sctp_tsnmap_init(&asoc->peer.tsn_map, SCTP_TSN_MAP_INITIAL, 705 init_tsn, GFP_ATOMIC); 706 707 /* G4: The same processing as though a FWD-TSN chunk (as defined in 708 * [RFC3758]) with all streams affected and a new cumulative TSN 709 * ACK of the Receiver's Next TSN minus 1 were received MUST be 710 * performed. 711 */ 712 sctp_outq_free(&asoc->outqueue); 713 714 /* G2: Compute an appropriate value for the local endpoint's next TSN, 715 * i.e., the next TSN assigned by the receiver of the SSN/TSN reset 716 * chunk. The value SHOULD be the highest TSN sent by the receiver 717 * of the request plus 1. 718 */ 719 next_tsn = asoc->next_tsn; 720 asoc->ctsn_ack_point = next_tsn - 1; 721 asoc->adv_peer_ack_point = asoc->ctsn_ack_point; 722 723 /* G5: The next expected and outgoing SSNs MUST be reset to 0 for all 724 * incoming and outgoing streams. 725 */ 726 for (i = 0; i < stream->outcnt; i++) 727 stream->out[i].ssn = 0; 728 for (i = 0; i < stream->incnt; i++) 729 stream->in[i].ssn = 0; 730 731 result = SCTP_STRRESET_PERFORMED; 732 733 *evp = sctp_ulpevent_make_assoc_reset_event(asoc, 0, init_tsn, 734 next_tsn, GFP_ATOMIC); 735 736 out: 737 sctp_update_strreset_result(asoc, result); 738 err: 739 return sctp_make_strreset_tsnresp(asoc, result, request_seq, 740 next_tsn, init_tsn); 741 } 742 743 struct sctp_chunk *sctp_process_strreset_addstrm_out( 744 struct sctp_association *asoc, 745 union sctp_params param, 746 struct sctp_ulpevent **evp) 747 { 748 struct sctp_strreset_addstrm *addstrm = param.v; 749 struct sctp_stream *stream = &asoc->stream; 750 __u32 result = SCTP_STRRESET_DENIED; 751 __u32 request_seq, incnt; 752 __u16 in, i; 753 754 request_seq = ntohl(addstrm->request_seq); 755 if (TSN_lt(asoc->strreset_inseq, request_seq) || 756 TSN_lt(request_seq, asoc->strreset_inseq - 2)) { 757 result = SCTP_STRRESET_ERR_BAD_SEQNO; 758 goto err; 759 } else if (TSN_lt(request_seq, asoc->strreset_inseq)) { 760 i = asoc->strreset_inseq - request_seq - 1; 761 result = asoc->strreset_result[i]; 762 goto err; 763 } 764 asoc->strreset_inseq++; 765 766 if (!(asoc->strreset_enable & SCTP_ENABLE_CHANGE_ASSOC_REQ)) 767 goto out; 768 769 if (asoc->strreset_chunk) { 770 if (!sctp_chunk_lookup_strreset_param( 771 asoc, 0, SCTP_PARAM_RESET_ADD_IN_STREAMS)) { 772 /* same process with outstanding isn't 0 */ 773 result = SCTP_STRRESET_ERR_IN_PROGRESS; 774 goto out; 775 } 776 777 asoc->strreset_outstanding--; 778 asoc->strreset_outseq++; 779 780 if (!asoc->strreset_outstanding) { 781 struct sctp_transport *t; 782 783 t = asoc->strreset_chunk->transport; 784 if (del_timer(&t->reconf_timer)) 785 sctp_transport_put(t); 786 787 sctp_chunk_put(asoc->strreset_chunk); 788 asoc->strreset_chunk = NULL; 789 } 790 } 791 792 in = ntohs(addstrm->number_of_streams); 793 incnt = stream->incnt + in; 794 if (!in || incnt > SCTP_MAX_STREAM) 795 goto out; 796 797 if (sctp_stream_alloc_in(stream, incnt, GFP_ATOMIC)) 798 goto out; 799 800 stream->incnt = incnt; 801 802 result = SCTP_STRRESET_PERFORMED; 803 804 *evp = sctp_ulpevent_make_stream_change_event(asoc, 805 0, ntohs(addstrm->number_of_streams), 0, GFP_ATOMIC); 806 807 out: 808 sctp_update_strreset_result(asoc, result); 809 err: 810 return sctp_make_strreset_resp(asoc, result, request_seq); 811 } 812 813 struct sctp_chunk *sctp_process_strreset_addstrm_in( 814 struct sctp_association *asoc, 815 union sctp_params param, 816 struct sctp_ulpevent **evp) 817 { 818 struct sctp_strreset_addstrm *addstrm = param.v; 819 struct sctp_stream *stream = &asoc->stream; 820 __u32 result = SCTP_STRRESET_DENIED; 821 struct sctp_chunk *chunk = NULL; 822 __u32 request_seq, outcnt; 823 __u16 out, i; 824 int ret; 825 826 request_seq = ntohl(addstrm->request_seq); 827 if (TSN_lt(asoc->strreset_inseq, request_seq) || 828 TSN_lt(request_seq, asoc->strreset_inseq - 2)) { 829 result = SCTP_STRRESET_ERR_BAD_SEQNO; 830 goto err; 831 } else if (TSN_lt(request_seq, asoc->strreset_inseq)) { 832 i = asoc->strreset_inseq - request_seq - 1; 833 result = asoc->strreset_result[i]; 834 if (result == SCTP_STRRESET_PERFORMED) 835 return NULL; 836 goto err; 837 } 838 asoc->strreset_inseq++; 839 840 if (!(asoc->strreset_enable & SCTP_ENABLE_CHANGE_ASSOC_REQ)) 841 goto out; 842 843 if (asoc->strreset_outstanding) { 844 result = SCTP_STRRESET_ERR_IN_PROGRESS; 845 goto out; 846 } 847 848 out = ntohs(addstrm->number_of_streams); 849 outcnt = stream->outcnt + out; 850 if (!out || outcnt > SCTP_MAX_STREAM) 851 goto out; 852 853 ret = sctp_stream_alloc_out(stream, outcnt, GFP_ATOMIC); 854 if (ret) 855 goto out; 856 857 chunk = sctp_make_strreset_addstrm(asoc, out, 0); 858 if (!chunk) 859 goto out; 860 861 asoc->strreset_chunk = chunk; 862 asoc->strreset_outstanding = 1; 863 sctp_chunk_hold(asoc->strreset_chunk); 864 865 stream->outcnt = outcnt; 866 867 result = SCTP_STRRESET_PERFORMED; 868 869 *evp = sctp_ulpevent_make_stream_change_event(asoc, 870 0, 0, ntohs(addstrm->number_of_streams), GFP_ATOMIC); 871 872 out: 873 sctp_update_strreset_result(asoc, result); 874 err: 875 if (!chunk) 876 chunk = sctp_make_strreset_resp(asoc, result, request_seq); 877 878 return chunk; 879 } 880 881 struct sctp_chunk *sctp_process_strreset_resp( 882 struct sctp_association *asoc, 883 union sctp_params param, 884 struct sctp_ulpevent **evp) 885 { 886 struct sctp_stream *stream = &asoc->stream; 887 struct sctp_strreset_resp *resp = param.v; 888 struct sctp_transport *t; 889 __u16 i, nums, flags = 0; 890 struct sctp_paramhdr *req; 891 __u32 result; 892 893 req = sctp_chunk_lookup_strreset_param(asoc, resp->response_seq, 0); 894 if (!req) 895 return NULL; 896 897 result = ntohl(resp->result); 898 if (result != SCTP_STRRESET_PERFORMED) { 899 /* if in progress, do nothing but retransmit */ 900 if (result == SCTP_STRRESET_IN_PROGRESS) 901 return NULL; 902 else if (result == SCTP_STRRESET_DENIED) 903 flags = SCTP_STREAM_RESET_DENIED; 904 else 905 flags = SCTP_STREAM_RESET_FAILED; 906 } 907 908 if (req->type == SCTP_PARAM_RESET_OUT_REQUEST) { 909 struct sctp_strreset_outreq *outreq; 910 __be16 *str_p; 911 912 outreq = (struct sctp_strreset_outreq *)req; 913 str_p = outreq->list_of_streams; 914 nums = (ntohs(outreq->param_hdr.length) - sizeof(*outreq)) / 2; 915 916 if (result == SCTP_STRRESET_PERFORMED) { 917 if (nums) { 918 for (i = 0; i < nums; i++) 919 stream->out[ntohs(str_p[i])].ssn = 0; 920 } else { 921 for (i = 0; i < stream->outcnt; i++) 922 stream->out[i].ssn = 0; 923 } 924 925 flags = SCTP_STREAM_RESET_OUTGOING_SSN; 926 } 927 928 for (i = 0; i < stream->outcnt; i++) 929 stream->out[i].state = SCTP_STREAM_OPEN; 930 931 *evp = sctp_ulpevent_make_stream_reset_event(asoc, flags, 932 nums, str_p, GFP_ATOMIC); 933 } else if (req->type == SCTP_PARAM_RESET_IN_REQUEST) { 934 struct sctp_strreset_inreq *inreq; 935 __be16 *str_p; 936 937 /* if the result is performed, it's impossible for inreq */ 938 if (result == SCTP_STRRESET_PERFORMED) 939 return NULL; 940 941 inreq = (struct sctp_strreset_inreq *)req; 942 str_p = inreq->list_of_streams; 943 nums = (ntohs(inreq->param_hdr.length) - sizeof(*inreq)) / 2; 944 945 *evp = sctp_ulpevent_make_stream_reset_event(asoc, flags, 946 nums, str_p, GFP_ATOMIC); 947 } else if (req->type == SCTP_PARAM_RESET_TSN_REQUEST) { 948 struct sctp_strreset_resptsn *resptsn; 949 __u32 stsn, rtsn; 950 951 /* check for resptsn, as sctp_verify_reconf didn't do it*/ 952 if (ntohs(param.p->length) != sizeof(*resptsn)) 953 return NULL; 954 955 resptsn = (struct sctp_strreset_resptsn *)resp; 956 stsn = ntohl(resptsn->senders_next_tsn); 957 rtsn = ntohl(resptsn->receivers_next_tsn); 958 959 if (result == SCTP_STRRESET_PERFORMED) { 960 __u32 mtsn = sctp_tsnmap_get_max_tsn_seen( 961 &asoc->peer.tsn_map); 962 963 sctp_ulpq_reasm_flushtsn(&asoc->ulpq, mtsn); 964 sctp_ulpq_abort_pd(&asoc->ulpq, GFP_ATOMIC); 965 966 sctp_tsnmap_init(&asoc->peer.tsn_map, 967 SCTP_TSN_MAP_INITIAL, 968 stsn, GFP_ATOMIC); 969 970 sctp_outq_free(&asoc->outqueue); 971 972 asoc->next_tsn = rtsn; 973 asoc->ctsn_ack_point = asoc->next_tsn - 1; 974 asoc->adv_peer_ack_point = asoc->ctsn_ack_point; 975 976 for (i = 0; i < stream->outcnt; i++) 977 stream->out[i].ssn = 0; 978 for (i = 0; i < stream->incnt; i++) 979 stream->in[i].ssn = 0; 980 } 981 982 for (i = 0; i < stream->outcnt; i++) 983 stream->out[i].state = SCTP_STREAM_OPEN; 984 985 *evp = sctp_ulpevent_make_assoc_reset_event(asoc, flags, 986 stsn, rtsn, GFP_ATOMIC); 987 } else if (req->type == SCTP_PARAM_RESET_ADD_OUT_STREAMS) { 988 struct sctp_strreset_addstrm *addstrm; 989 __u16 number; 990 991 addstrm = (struct sctp_strreset_addstrm *)req; 992 nums = ntohs(addstrm->number_of_streams); 993 number = stream->outcnt - nums; 994 995 if (result == SCTP_STRRESET_PERFORMED) 996 for (i = number; i < stream->outcnt; i++) 997 stream->out[i].state = SCTP_STREAM_OPEN; 998 else 999 stream->outcnt = number; 1000 1001 *evp = sctp_ulpevent_make_stream_change_event(asoc, flags, 1002 0, nums, GFP_ATOMIC); 1003 } else if (req->type == SCTP_PARAM_RESET_ADD_IN_STREAMS) { 1004 struct sctp_strreset_addstrm *addstrm; 1005 1006 /* if the result is performed, it's impossible for addstrm in 1007 * request. 1008 */ 1009 if (result == SCTP_STRRESET_PERFORMED) 1010 return NULL; 1011 1012 addstrm = (struct sctp_strreset_addstrm *)req; 1013 nums = ntohs(addstrm->number_of_streams); 1014 1015 *evp = sctp_ulpevent_make_stream_change_event(asoc, flags, 1016 nums, 0, GFP_ATOMIC); 1017 } 1018 1019 asoc->strreset_outstanding--; 1020 asoc->strreset_outseq++; 1021 1022 /* remove everything for this reconf request */ 1023 if (!asoc->strreset_outstanding) { 1024 t = asoc->strreset_chunk->transport; 1025 if (del_timer(&t->reconf_timer)) 1026 sctp_transport_put(t); 1027 1028 sctp_chunk_put(asoc->strreset_chunk); 1029 asoc->strreset_chunk = NULL; 1030 } 1031 1032 return NULL; 1033 } 1034