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 (str_nums) { 286 int param_len = 0; 287 288 if (out) { 289 for (i = 0; i < str_nums; i++) 290 if (str_list[i] >= stream->outcnt) 291 goto out; 292 293 param_len = str_nums * sizeof(__u16) + 294 sizeof(struct sctp_strreset_outreq); 295 } 296 297 if (in) { 298 for (i = 0; i < str_nums; i++) 299 if (str_list[i] >= stream->incnt) 300 goto out; 301 302 param_len += str_nums * sizeof(__u16) + 303 sizeof(struct sctp_strreset_inreq); 304 } 305 306 if (param_len > SCTP_MAX_CHUNK_LEN - 307 sizeof(struct sctp_reconf_chunk)) 308 goto out; 309 } 310 311 nstr_list = kcalloc(str_nums, sizeof(__be16), GFP_KERNEL); 312 if (!nstr_list) { 313 retval = -ENOMEM; 314 goto out; 315 } 316 317 for (i = 0; i < str_nums; i++) 318 nstr_list[i] = htons(str_list[i]); 319 320 chunk = sctp_make_strreset_req(asoc, str_nums, nstr_list, out, in); 321 322 kfree(nstr_list); 323 324 if (!chunk) { 325 retval = -ENOMEM; 326 goto out; 327 } 328 329 if (out) { 330 if (str_nums) 331 for (i = 0; i < str_nums; i++) 332 stream->out[str_list[i]].state = 333 SCTP_STREAM_CLOSED; 334 else 335 for (i = 0; i < stream->outcnt; i++) 336 stream->out[i].state = SCTP_STREAM_CLOSED; 337 } 338 339 asoc->strreset_chunk = chunk; 340 sctp_chunk_hold(asoc->strreset_chunk); 341 342 retval = sctp_send_reconf(asoc, chunk); 343 if (retval) { 344 sctp_chunk_put(asoc->strreset_chunk); 345 asoc->strreset_chunk = NULL; 346 if (!out) 347 goto out; 348 349 if (str_nums) 350 for (i = 0; i < str_nums; i++) 351 stream->out[str_list[i]].state = 352 SCTP_STREAM_OPEN; 353 else 354 for (i = 0; i < stream->outcnt; i++) 355 stream->out[i].state = SCTP_STREAM_OPEN; 356 357 goto out; 358 } 359 360 asoc->strreset_outstanding = out + in; 361 362 out: 363 return retval; 364 } 365 366 int sctp_send_reset_assoc(struct sctp_association *asoc) 367 { 368 struct sctp_stream *stream = &asoc->stream; 369 struct sctp_chunk *chunk = NULL; 370 int retval; 371 __u16 i; 372 373 if (!asoc->peer.reconf_capable || 374 !(asoc->strreset_enable & SCTP_ENABLE_RESET_ASSOC_REQ)) 375 return -ENOPROTOOPT; 376 377 if (asoc->strreset_outstanding) 378 return -EINPROGRESS; 379 380 chunk = sctp_make_strreset_tsnreq(asoc); 381 if (!chunk) 382 return -ENOMEM; 383 384 /* Block further xmit of data until this request is completed */ 385 for (i = 0; i < stream->outcnt; i++) 386 stream->out[i].state = SCTP_STREAM_CLOSED; 387 388 asoc->strreset_chunk = chunk; 389 sctp_chunk_hold(asoc->strreset_chunk); 390 391 retval = sctp_send_reconf(asoc, chunk); 392 if (retval) { 393 sctp_chunk_put(asoc->strreset_chunk); 394 asoc->strreset_chunk = NULL; 395 396 for (i = 0; i < stream->outcnt; i++) 397 stream->out[i].state = SCTP_STREAM_OPEN; 398 399 return retval; 400 } 401 402 asoc->strreset_outstanding = 1; 403 404 return 0; 405 } 406 407 int sctp_send_add_streams(struct sctp_association *asoc, 408 struct sctp_add_streams *params) 409 { 410 struct sctp_stream *stream = &asoc->stream; 411 struct sctp_chunk *chunk = NULL; 412 int retval; 413 __u32 outcnt, incnt; 414 __u16 out, in; 415 416 if (!asoc->peer.reconf_capable || 417 !(asoc->strreset_enable & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 418 retval = -ENOPROTOOPT; 419 goto out; 420 } 421 422 if (asoc->strreset_outstanding) { 423 retval = -EINPROGRESS; 424 goto out; 425 } 426 427 out = params->sas_outstrms; 428 in = params->sas_instrms; 429 outcnt = stream->outcnt + out; 430 incnt = stream->incnt + in; 431 if (outcnt > SCTP_MAX_STREAM || incnt > SCTP_MAX_STREAM || 432 (!out && !in)) { 433 retval = -EINVAL; 434 goto out; 435 } 436 437 if (out) { 438 retval = sctp_stream_alloc_out(stream, outcnt, GFP_KERNEL); 439 if (retval) 440 goto out; 441 } 442 443 chunk = sctp_make_strreset_addstrm(asoc, out, in); 444 if (!chunk) { 445 retval = -ENOMEM; 446 goto out; 447 } 448 449 asoc->strreset_chunk = chunk; 450 sctp_chunk_hold(asoc->strreset_chunk); 451 452 retval = sctp_send_reconf(asoc, chunk); 453 if (retval) { 454 sctp_chunk_put(asoc->strreset_chunk); 455 asoc->strreset_chunk = NULL; 456 goto out; 457 } 458 459 stream->incnt = incnt; 460 stream->outcnt = outcnt; 461 462 asoc->strreset_outstanding = !!out + !!in; 463 464 out: 465 return retval; 466 } 467 468 static struct sctp_paramhdr *sctp_chunk_lookup_strreset_param( 469 struct sctp_association *asoc, __be32 resp_seq, 470 __be16 type) 471 { 472 struct sctp_chunk *chunk = asoc->strreset_chunk; 473 struct sctp_reconf_chunk *hdr; 474 union sctp_params param; 475 476 if (!chunk) 477 return NULL; 478 479 hdr = (struct sctp_reconf_chunk *)chunk->chunk_hdr; 480 sctp_walk_params(param, hdr, params) { 481 /* sctp_strreset_tsnreq is actually the basic structure 482 * of all stream reconf params, so it's safe to use it 483 * to access request_seq. 484 */ 485 struct sctp_strreset_tsnreq *req = param.v; 486 487 if ((!resp_seq || req->request_seq == resp_seq) && 488 (!type || type == req->param_hdr.type)) 489 return param.v; 490 } 491 492 return NULL; 493 } 494 495 static void sctp_update_strreset_result(struct sctp_association *asoc, 496 __u32 result) 497 { 498 asoc->strreset_result[1] = asoc->strreset_result[0]; 499 asoc->strreset_result[0] = result; 500 } 501 502 struct sctp_chunk *sctp_process_strreset_outreq( 503 struct sctp_association *asoc, 504 union sctp_params param, 505 struct sctp_ulpevent **evp) 506 { 507 struct sctp_strreset_outreq *outreq = param.v; 508 struct sctp_stream *stream = &asoc->stream; 509 __u32 result = SCTP_STRRESET_DENIED; 510 __u16 i, nums, flags = 0; 511 __be16 *str_p = NULL; 512 __u32 request_seq; 513 514 request_seq = ntohl(outreq->request_seq); 515 516 if (ntohl(outreq->send_reset_at_tsn) > 517 sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map)) { 518 result = SCTP_STRRESET_IN_PROGRESS; 519 goto err; 520 } 521 522 if (TSN_lt(asoc->strreset_inseq, request_seq) || 523 TSN_lt(request_seq, asoc->strreset_inseq - 2)) { 524 result = SCTP_STRRESET_ERR_BAD_SEQNO; 525 goto err; 526 } else if (TSN_lt(request_seq, asoc->strreset_inseq)) { 527 i = asoc->strreset_inseq - request_seq - 1; 528 result = asoc->strreset_result[i]; 529 goto err; 530 } 531 asoc->strreset_inseq++; 532 533 /* Check strreset_enable after inseq inc, as sender cannot tell 534 * the peer doesn't enable strreset after receiving response with 535 * result denied, as well as to keep consistent with bsd. 536 */ 537 if (!(asoc->strreset_enable & SCTP_ENABLE_RESET_STREAM_REQ)) 538 goto out; 539 540 if (asoc->strreset_chunk) { 541 if (!sctp_chunk_lookup_strreset_param( 542 asoc, outreq->response_seq, 543 SCTP_PARAM_RESET_IN_REQUEST)) { 544 /* same process with outstanding isn't 0 */ 545 result = SCTP_STRRESET_ERR_IN_PROGRESS; 546 goto out; 547 } 548 549 asoc->strreset_outstanding--; 550 asoc->strreset_outseq++; 551 552 if (!asoc->strreset_outstanding) { 553 struct sctp_transport *t; 554 555 t = asoc->strreset_chunk->transport; 556 if (del_timer(&t->reconf_timer)) 557 sctp_transport_put(t); 558 559 sctp_chunk_put(asoc->strreset_chunk); 560 asoc->strreset_chunk = NULL; 561 } 562 563 flags = SCTP_STREAM_RESET_INCOMING_SSN; 564 } 565 566 nums = (ntohs(param.p->length) - sizeof(*outreq)) / 2; 567 if (nums) { 568 str_p = outreq->list_of_streams; 569 for (i = 0; i < nums; i++) { 570 if (ntohs(str_p[i]) >= stream->incnt) { 571 result = SCTP_STRRESET_ERR_WRONG_SSN; 572 goto out; 573 } 574 } 575 576 for (i = 0; i < nums; i++) 577 stream->in[ntohs(str_p[i])].ssn = 0; 578 } else { 579 for (i = 0; i < stream->incnt; i++) 580 stream->in[i].ssn = 0; 581 } 582 583 result = SCTP_STRRESET_PERFORMED; 584 585 *evp = sctp_ulpevent_make_stream_reset_event(asoc, 586 flags | SCTP_STREAM_RESET_OUTGOING_SSN, nums, str_p, 587 GFP_ATOMIC); 588 589 out: 590 sctp_update_strreset_result(asoc, result); 591 err: 592 return sctp_make_strreset_resp(asoc, result, request_seq); 593 } 594 595 struct sctp_chunk *sctp_process_strreset_inreq( 596 struct sctp_association *asoc, 597 union sctp_params param, 598 struct sctp_ulpevent **evp) 599 { 600 struct sctp_strreset_inreq *inreq = param.v; 601 struct sctp_stream *stream = &asoc->stream; 602 __u32 result = SCTP_STRRESET_DENIED; 603 struct sctp_chunk *chunk = NULL; 604 __u32 request_seq; 605 __u16 i, nums; 606 __be16 *str_p; 607 608 request_seq = ntohl(inreq->request_seq); 609 if (TSN_lt(asoc->strreset_inseq, request_seq) || 610 TSN_lt(request_seq, asoc->strreset_inseq - 2)) { 611 result = SCTP_STRRESET_ERR_BAD_SEQNO; 612 goto err; 613 } else if (TSN_lt(request_seq, asoc->strreset_inseq)) { 614 i = asoc->strreset_inseq - request_seq - 1; 615 result = asoc->strreset_result[i]; 616 if (result == SCTP_STRRESET_PERFORMED) 617 return NULL; 618 goto err; 619 } 620 asoc->strreset_inseq++; 621 622 if (!(asoc->strreset_enable & SCTP_ENABLE_RESET_STREAM_REQ)) 623 goto out; 624 625 if (asoc->strreset_outstanding) { 626 result = SCTP_STRRESET_ERR_IN_PROGRESS; 627 goto out; 628 } 629 630 nums = (ntohs(param.p->length) - sizeof(*inreq)) / 2; 631 str_p = inreq->list_of_streams; 632 for (i = 0; i < nums; i++) { 633 if (ntohs(str_p[i]) >= stream->outcnt) { 634 result = SCTP_STRRESET_ERR_WRONG_SSN; 635 goto out; 636 } 637 } 638 639 chunk = sctp_make_strreset_req(asoc, nums, str_p, 1, 0); 640 if (!chunk) 641 goto out; 642 643 if (nums) 644 for (i = 0; i < nums; i++) 645 stream->out[ntohs(str_p[i])].state = 646 SCTP_STREAM_CLOSED; 647 else 648 for (i = 0; i < stream->outcnt; i++) 649 stream->out[i].state = SCTP_STREAM_CLOSED; 650 651 asoc->strreset_chunk = chunk; 652 asoc->strreset_outstanding = 1; 653 sctp_chunk_hold(asoc->strreset_chunk); 654 655 result = SCTP_STRRESET_PERFORMED; 656 657 *evp = sctp_ulpevent_make_stream_reset_event(asoc, 658 SCTP_STREAM_RESET_INCOMING_SSN, nums, str_p, GFP_ATOMIC); 659 660 out: 661 sctp_update_strreset_result(asoc, result); 662 err: 663 if (!chunk) 664 chunk = sctp_make_strreset_resp(asoc, result, request_seq); 665 666 return chunk; 667 } 668 669 struct sctp_chunk *sctp_process_strreset_tsnreq( 670 struct sctp_association *asoc, 671 union sctp_params param, 672 struct sctp_ulpevent **evp) 673 { 674 __u32 init_tsn = 0, next_tsn = 0, max_tsn_seen; 675 struct sctp_strreset_tsnreq *tsnreq = param.v; 676 struct sctp_stream *stream = &asoc->stream; 677 __u32 result = SCTP_STRRESET_DENIED; 678 __u32 request_seq; 679 __u16 i; 680 681 request_seq = ntohl(tsnreq->request_seq); 682 if (TSN_lt(asoc->strreset_inseq, request_seq) || 683 TSN_lt(request_seq, asoc->strreset_inseq - 2)) { 684 result = SCTP_STRRESET_ERR_BAD_SEQNO; 685 goto err; 686 } else if (TSN_lt(request_seq, asoc->strreset_inseq)) { 687 i = asoc->strreset_inseq - request_seq - 1; 688 result = asoc->strreset_result[i]; 689 if (result == SCTP_STRRESET_PERFORMED) { 690 next_tsn = asoc->next_tsn; 691 init_tsn = 692 sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map) + 1; 693 } 694 goto err; 695 } 696 asoc->strreset_inseq++; 697 698 if (!(asoc->strreset_enable & SCTP_ENABLE_RESET_ASSOC_REQ)) 699 goto out; 700 701 if (asoc->strreset_outstanding) { 702 result = SCTP_STRRESET_ERR_IN_PROGRESS; 703 goto out; 704 } 705 706 /* G3: The same processing as though a SACK chunk with no gap report 707 * and a cumulative TSN ACK of the Sender's Next TSN minus 1 were 708 * received MUST be performed. 709 */ 710 max_tsn_seen = sctp_tsnmap_get_max_tsn_seen(&asoc->peer.tsn_map); 711 sctp_ulpq_reasm_flushtsn(&asoc->ulpq, max_tsn_seen); 712 sctp_ulpq_abort_pd(&asoc->ulpq, GFP_ATOMIC); 713 714 /* G1: Compute an appropriate value for the Receiver's Next TSN -- the 715 * TSN that the peer should use to send the next DATA chunk. The 716 * value SHOULD be the smallest TSN not acknowledged by the 717 * receiver of the request plus 2^31. 718 */ 719 init_tsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map) + (1 << 31); 720 sctp_tsnmap_init(&asoc->peer.tsn_map, SCTP_TSN_MAP_INITIAL, 721 init_tsn, GFP_ATOMIC); 722 723 /* G4: The same processing as though a FWD-TSN chunk (as defined in 724 * [RFC3758]) with all streams affected and a new cumulative TSN 725 * ACK of the Receiver's Next TSN minus 1 were received MUST be 726 * performed. 727 */ 728 sctp_outq_free(&asoc->outqueue); 729 730 /* G2: Compute an appropriate value for the local endpoint's next TSN, 731 * i.e., the next TSN assigned by the receiver of the SSN/TSN reset 732 * chunk. The value SHOULD be the highest TSN sent by the receiver 733 * of the request plus 1. 734 */ 735 next_tsn = asoc->next_tsn; 736 asoc->ctsn_ack_point = next_tsn - 1; 737 asoc->adv_peer_ack_point = asoc->ctsn_ack_point; 738 739 /* G5: The next expected and outgoing SSNs MUST be reset to 0 for all 740 * incoming and outgoing streams. 741 */ 742 for (i = 0; i < stream->outcnt; i++) 743 stream->out[i].ssn = 0; 744 for (i = 0; i < stream->incnt; i++) 745 stream->in[i].ssn = 0; 746 747 result = SCTP_STRRESET_PERFORMED; 748 749 *evp = sctp_ulpevent_make_assoc_reset_event(asoc, 0, init_tsn, 750 next_tsn, GFP_ATOMIC); 751 752 out: 753 sctp_update_strreset_result(asoc, result); 754 err: 755 return sctp_make_strreset_tsnresp(asoc, result, request_seq, 756 next_tsn, init_tsn); 757 } 758 759 struct sctp_chunk *sctp_process_strreset_addstrm_out( 760 struct sctp_association *asoc, 761 union sctp_params param, 762 struct sctp_ulpevent **evp) 763 { 764 struct sctp_strreset_addstrm *addstrm = param.v; 765 struct sctp_stream *stream = &asoc->stream; 766 __u32 result = SCTP_STRRESET_DENIED; 767 __u32 request_seq, incnt; 768 __u16 in, i; 769 770 request_seq = ntohl(addstrm->request_seq); 771 if (TSN_lt(asoc->strreset_inseq, request_seq) || 772 TSN_lt(request_seq, asoc->strreset_inseq - 2)) { 773 result = SCTP_STRRESET_ERR_BAD_SEQNO; 774 goto err; 775 } else if (TSN_lt(request_seq, asoc->strreset_inseq)) { 776 i = asoc->strreset_inseq - request_seq - 1; 777 result = asoc->strreset_result[i]; 778 goto err; 779 } 780 asoc->strreset_inseq++; 781 782 if (!(asoc->strreset_enable & SCTP_ENABLE_CHANGE_ASSOC_REQ)) 783 goto out; 784 785 if (asoc->strreset_chunk) { 786 if (!sctp_chunk_lookup_strreset_param( 787 asoc, 0, SCTP_PARAM_RESET_ADD_IN_STREAMS)) { 788 /* same process with outstanding isn't 0 */ 789 result = SCTP_STRRESET_ERR_IN_PROGRESS; 790 goto out; 791 } 792 793 asoc->strreset_outstanding--; 794 asoc->strreset_outseq++; 795 796 if (!asoc->strreset_outstanding) { 797 struct sctp_transport *t; 798 799 t = asoc->strreset_chunk->transport; 800 if (del_timer(&t->reconf_timer)) 801 sctp_transport_put(t); 802 803 sctp_chunk_put(asoc->strreset_chunk); 804 asoc->strreset_chunk = NULL; 805 } 806 } 807 808 in = ntohs(addstrm->number_of_streams); 809 incnt = stream->incnt + in; 810 if (!in || incnt > SCTP_MAX_STREAM) 811 goto out; 812 813 if (sctp_stream_alloc_in(stream, incnt, GFP_ATOMIC)) 814 goto out; 815 816 stream->incnt = incnt; 817 818 result = SCTP_STRRESET_PERFORMED; 819 820 *evp = sctp_ulpevent_make_stream_change_event(asoc, 821 0, ntohs(addstrm->number_of_streams), 0, GFP_ATOMIC); 822 823 out: 824 sctp_update_strreset_result(asoc, result); 825 err: 826 return sctp_make_strreset_resp(asoc, result, request_seq); 827 } 828 829 struct sctp_chunk *sctp_process_strreset_addstrm_in( 830 struct sctp_association *asoc, 831 union sctp_params param, 832 struct sctp_ulpevent **evp) 833 { 834 struct sctp_strreset_addstrm *addstrm = param.v; 835 struct sctp_stream *stream = &asoc->stream; 836 __u32 result = SCTP_STRRESET_DENIED; 837 struct sctp_chunk *chunk = NULL; 838 __u32 request_seq, outcnt; 839 __u16 out, i; 840 int ret; 841 842 request_seq = ntohl(addstrm->request_seq); 843 if (TSN_lt(asoc->strreset_inseq, request_seq) || 844 TSN_lt(request_seq, asoc->strreset_inseq - 2)) { 845 result = SCTP_STRRESET_ERR_BAD_SEQNO; 846 goto err; 847 } else if (TSN_lt(request_seq, asoc->strreset_inseq)) { 848 i = asoc->strreset_inseq - request_seq - 1; 849 result = asoc->strreset_result[i]; 850 if (result == SCTP_STRRESET_PERFORMED) 851 return NULL; 852 goto err; 853 } 854 asoc->strreset_inseq++; 855 856 if (!(asoc->strreset_enable & SCTP_ENABLE_CHANGE_ASSOC_REQ)) 857 goto out; 858 859 if (asoc->strreset_outstanding) { 860 result = SCTP_STRRESET_ERR_IN_PROGRESS; 861 goto out; 862 } 863 864 out = ntohs(addstrm->number_of_streams); 865 outcnt = stream->outcnt + out; 866 if (!out || outcnt > SCTP_MAX_STREAM) 867 goto out; 868 869 ret = sctp_stream_alloc_out(stream, outcnt, GFP_ATOMIC); 870 if (ret) 871 goto out; 872 873 chunk = sctp_make_strreset_addstrm(asoc, out, 0); 874 if (!chunk) 875 goto out; 876 877 asoc->strreset_chunk = chunk; 878 asoc->strreset_outstanding = 1; 879 sctp_chunk_hold(asoc->strreset_chunk); 880 881 stream->outcnt = outcnt; 882 883 result = SCTP_STRRESET_PERFORMED; 884 885 *evp = sctp_ulpevent_make_stream_change_event(asoc, 886 0, 0, ntohs(addstrm->number_of_streams), GFP_ATOMIC); 887 888 out: 889 sctp_update_strreset_result(asoc, result); 890 err: 891 if (!chunk) 892 chunk = sctp_make_strreset_resp(asoc, result, request_seq); 893 894 return chunk; 895 } 896 897 struct sctp_chunk *sctp_process_strreset_resp( 898 struct sctp_association *asoc, 899 union sctp_params param, 900 struct sctp_ulpevent **evp) 901 { 902 struct sctp_stream *stream = &asoc->stream; 903 struct sctp_strreset_resp *resp = param.v; 904 struct sctp_transport *t; 905 __u16 i, nums, flags = 0; 906 struct sctp_paramhdr *req; 907 __u32 result; 908 909 req = sctp_chunk_lookup_strreset_param(asoc, resp->response_seq, 0); 910 if (!req) 911 return NULL; 912 913 result = ntohl(resp->result); 914 if (result != SCTP_STRRESET_PERFORMED) { 915 /* if in progress, do nothing but retransmit */ 916 if (result == SCTP_STRRESET_IN_PROGRESS) 917 return NULL; 918 else if (result == SCTP_STRRESET_DENIED) 919 flags = SCTP_STREAM_RESET_DENIED; 920 else 921 flags = SCTP_STREAM_RESET_FAILED; 922 } 923 924 if (req->type == SCTP_PARAM_RESET_OUT_REQUEST) { 925 struct sctp_strreset_outreq *outreq; 926 __be16 *str_p; 927 928 outreq = (struct sctp_strreset_outreq *)req; 929 str_p = outreq->list_of_streams; 930 nums = (ntohs(outreq->param_hdr.length) - sizeof(*outreq)) / 2; 931 932 if (result == SCTP_STRRESET_PERFORMED) { 933 if (nums) { 934 for (i = 0; i < nums; i++) 935 stream->out[ntohs(str_p[i])].ssn = 0; 936 } else { 937 for (i = 0; i < stream->outcnt; i++) 938 stream->out[i].ssn = 0; 939 } 940 941 flags = SCTP_STREAM_RESET_OUTGOING_SSN; 942 } 943 944 for (i = 0; i < stream->outcnt; i++) 945 stream->out[i].state = SCTP_STREAM_OPEN; 946 947 *evp = sctp_ulpevent_make_stream_reset_event(asoc, flags, 948 nums, str_p, GFP_ATOMIC); 949 } else if (req->type == SCTP_PARAM_RESET_IN_REQUEST) { 950 struct sctp_strreset_inreq *inreq; 951 __be16 *str_p; 952 953 /* if the result is performed, it's impossible for inreq */ 954 if (result == SCTP_STRRESET_PERFORMED) 955 return NULL; 956 957 inreq = (struct sctp_strreset_inreq *)req; 958 str_p = inreq->list_of_streams; 959 nums = (ntohs(inreq->param_hdr.length) - sizeof(*inreq)) / 2; 960 961 *evp = sctp_ulpevent_make_stream_reset_event(asoc, flags, 962 nums, str_p, GFP_ATOMIC); 963 } else if (req->type == SCTP_PARAM_RESET_TSN_REQUEST) { 964 struct sctp_strreset_resptsn *resptsn; 965 __u32 stsn, rtsn; 966 967 /* check for resptsn, as sctp_verify_reconf didn't do it*/ 968 if (ntohs(param.p->length) != sizeof(*resptsn)) 969 return NULL; 970 971 resptsn = (struct sctp_strreset_resptsn *)resp; 972 stsn = ntohl(resptsn->senders_next_tsn); 973 rtsn = ntohl(resptsn->receivers_next_tsn); 974 975 if (result == SCTP_STRRESET_PERFORMED) { 976 __u32 mtsn = sctp_tsnmap_get_max_tsn_seen( 977 &asoc->peer.tsn_map); 978 979 sctp_ulpq_reasm_flushtsn(&asoc->ulpq, mtsn); 980 sctp_ulpq_abort_pd(&asoc->ulpq, GFP_ATOMIC); 981 982 sctp_tsnmap_init(&asoc->peer.tsn_map, 983 SCTP_TSN_MAP_INITIAL, 984 stsn, GFP_ATOMIC); 985 986 sctp_outq_free(&asoc->outqueue); 987 988 asoc->next_tsn = rtsn; 989 asoc->ctsn_ack_point = asoc->next_tsn - 1; 990 asoc->adv_peer_ack_point = asoc->ctsn_ack_point; 991 992 for (i = 0; i < stream->outcnt; i++) 993 stream->out[i].ssn = 0; 994 for (i = 0; i < stream->incnt; i++) 995 stream->in[i].ssn = 0; 996 } 997 998 for (i = 0; i < stream->outcnt; i++) 999 stream->out[i].state = SCTP_STREAM_OPEN; 1000 1001 *evp = sctp_ulpevent_make_assoc_reset_event(asoc, flags, 1002 stsn, rtsn, GFP_ATOMIC); 1003 } else if (req->type == SCTP_PARAM_RESET_ADD_OUT_STREAMS) { 1004 struct sctp_strreset_addstrm *addstrm; 1005 __u16 number; 1006 1007 addstrm = (struct sctp_strreset_addstrm *)req; 1008 nums = ntohs(addstrm->number_of_streams); 1009 number = stream->outcnt - nums; 1010 1011 if (result == SCTP_STRRESET_PERFORMED) 1012 for (i = number; i < stream->outcnt; i++) 1013 stream->out[i].state = SCTP_STREAM_OPEN; 1014 else 1015 stream->outcnt = number; 1016 1017 *evp = sctp_ulpevent_make_stream_change_event(asoc, flags, 1018 0, nums, GFP_ATOMIC); 1019 } else if (req->type == SCTP_PARAM_RESET_ADD_IN_STREAMS) { 1020 struct sctp_strreset_addstrm *addstrm; 1021 1022 /* if the result is performed, it's impossible for addstrm in 1023 * request. 1024 */ 1025 if (result == SCTP_STRRESET_PERFORMED) 1026 return NULL; 1027 1028 addstrm = (struct sctp_strreset_addstrm *)req; 1029 nums = ntohs(addstrm->number_of_streams); 1030 1031 *evp = sctp_ulpevent_make_stream_change_event(asoc, flags, 1032 nums, 0, GFP_ATOMIC); 1033 } 1034 1035 asoc->strreset_outstanding--; 1036 asoc->strreset_outseq++; 1037 1038 /* remove everything for this reconf request */ 1039 if (!asoc->strreset_outstanding) { 1040 t = asoc->strreset_chunk->transport; 1041 if (del_timer(&t->reconf_timer)) 1042 sctp_transport_put(t); 1043 1044 sctp_chunk_put(asoc->strreset_chunk); 1045 asoc->strreset_chunk = NULL; 1046 } 1047 1048 return NULL; 1049 } 1050