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