1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* SCTP kernel implementation 3 * (C) Copyright IBM Corp. 2001, 2004 4 * Copyright (c) 1999-2000 Cisco, Inc. 5 * Copyright (c) 1999-2001 Motorola, Inc. 6 * Copyright (c) 2001 Intel Corp. 7 * 8 * This file is part of the SCTP kernel implementation 9 * 10 * This file contains sctp stream maniuplation primitives and helpers. 11 * 12 * Please send any bug reports or fixes you make to the 13 * email address(es): 14 * lksctp developers <linux-sctp@vger.kernel.org> 15 * 16 * Written or modified by: 17 * Xin Long <lucien.xin@gmail.com> 18 */ 19 20 #include <linux/list.h> 21 #include <net/sctp/sctp.h> 22 #include <net/sctp/sm.h> 23 #include <net/sctp/stream_sched.h> 24 25 static void sctp_stream_shrink_out(struct sctp_stream *stream, __u16 outcnt) 26 { 27 struct sctp_association *asoc; 28 struct sctp_chunk *ch, *temp; 29 struct sctp_outq *outq; 30 31 asoc = container_of(stream, struct sctp_association, stream); 32 outq = &asoc->outqueue; 33 34 list_for_each_entry_safe(ch, temp, &outq->out_chunk_list, list) { 35 __u16 sid = sctp_chunk_stream_no(ch); 36 37 if (sid < outcnt) 38 continue; 39 40 sctp_sched_dequeue_common(outq, ch); 41 /* No need to call dequeue_done here because 42 * the chunks are not scheduled by now. 43 */ 44 45 /* Mark as failed send. */ 46 sctp_chunk_fail(ch, (__force __u32)SCTP_ERROR_INV_STRM); 47 if (asoc->peer.prsctp_capable && 48 SCTP_PR_PRIO_ENABLED(ch->sinfo.sinfo_flags)) 49 asoc->sent_cnt_removable--; 50 51 sctp_chunk_free(ch); 52 } 53 } 54 55 static void sctp_stream_free_ext(struct sctp_stream *stream, __u16 sid) 56 { 57 struct sctp_sched_ops *sched; 58 59 if (!SCTP_SO(stream, sid)->ext) 60 return; 61 62 sched = sctp_sched_ops_from_stream(stream); 63 sched->free_sid(stream, sid); 64 kfree(SCTP_SO(stream, sid)->ext); 65 SCTP_SO(stream, sid)->ext = NULL; 66 } 67 68 /* Migrates chunks from stream queues to new stream queues if needed, 69 * but not across associations. Also, removes those chunks to streams 70 * higher than the new max. 71 */ 72 static void sctp_stream_outq_migrate(struct sctp_stream *stream, 73 struct sctp_stream *new, __u16 outcnt) 74 { 75 int i; 76 77 if (stream->outcnt > outcnt) 78 sctp_stream_shrink_out(stream, outcnt); 79 80 if (new) { 81 /* Here we actually move the old ext stuff into the new 82 * buffer, because we want to keep it. Then 83 * sctp_stream_update will swap ->out pointers. 84 */ 85 for (i = 0; i < outcnt; i++) { 86 sctp_stream_free_ext(new, i); 87 SCTP_SO(new, i)->ext = SCTP_SO(stream, i)->ext; 88 SCTP_SO(stream, i)->ext = NULL; 89 } 90 } 91 92 for (i = outcnt; i < stream->outcnt; i++) 93 sctp_stream_free_ext(stream, i); 94 } 95 96 static int sctp_stream_alloc_out(struct sctp_stream *stream, __u16 outcnt, 97 gfp_t gfp) 98 { 99 int ret; 100 101 if (outcnt <= stream->outcnt) 102 goto out; 103 104 ret = genradix_prealloc(&stream->out, outcnt, gfp); 105 if (ret) 106 return ret; 107 108 out: 109 stream->outcnt = outcnt; 110 return 0; 111 } 112 113 static int sctp_stream_alloc_in(struct sctp_stream *stream, __u16 incnt, 114 gfp_t gfp) 115 { 116 int ret; 117 118 if (incnt <= stream->incnt) 119 goto out; 120 121 ret = genradix_prealloc(&stream->in, incnt, gfp); 122 if (ret) 123 return ret; 124 125 out: 126 stream->incnt = incnt; 127 return 0; 128 } 129 130 int sctp_stream_init(struct sctp_stream *stream, __u16 outcnt, __u16 incnt, 131 gfp_t gfp) 132 { 133 struct sctp_sched_ops *sched = sctp_sched_ops_from_stream(stream); 134 int i, ret = 0; 135 136 gfp |= __GFP_NOWARN; 137 138 /* Initial stream->out size may be very big, so free it and alloc 139 * a new one with new outcnt to save memory if needed. 140 */ 141 if (outcnt == stream->outcnt) 142 goto handle_in; 143 144 /* Filter out chunks queued on streams that won't exist anymore */ 145 sched->unsched_all(stream); 146 sctp_stream_outq_migrate(stream, NULL, outcnt); 147 sched->sched_all(stream); 148 149 ret = sctp_stream_alloc_out(stream, outcnt, gfp); 150 if (ret) 151 return ret; 152 153 for (i = 0; i < stream->outcnt; i++) 154 SCTP_SO(stream, i)->state = SCTP_STREAM_OPEN; 155 156 handle_in: 157 sctp_stream_interleave_init(stream); 158 if (!incnt) 159 return 0; 160 161 return sctp_stream_alloc_in(stream, incnt, gfp); 162 } 163 164 int sctp_stream_init_ext(struct sctp_stream *stream, __u16 sid) 165 { 166 struct sctp_stream_out_ext *soute; 167 int ret; 168 169 soute = kzalloc(sizeof(*soute), GFP_KERNEL); 170 if (!soute) 171 return -ENOMEM; 172 SCTP_SO(stream, sid)->ext = soute; 173 174 ret = sctp_sched_init_sid(stream, sid, GFP_KERNEL); 175 if (ret) { 176 kfree(SCTP_SO(stream, sid)->ext); 177 SCTP_SO(stream, sid)->ext = NULL; 178 } 179 180 return ret; 181 } 182 183 void sctp_stream_free(struct sctp_stream *stream) 184 { 185 struct sctp_sched_ops *sched = sctp_sched_ops_from_stream(stream); 186 int i; 187 188 sched->unsched_all(stream); 189 for (i = 0; i < stream->outcnt; i++) 190 sctp_stream_free_ext(stream, i); 191 genradix_free(&stream->out); 192 genradix_free(&stream->in); 193 } 194 195 void sctp_stream_clear(struct sctp_stream *stream) 196 { 197 int i; 198 199 for (i = 0; i < stream->outcnt; i++) { 200 SCTP_SO(stream, i)->mid = 0; 201 SCTP_SO(stream, i)->mid_uo = 0; 202 } 203 204 for (i = 0; i < stream->incnt; i++) 205 SCTP_SI(stream, i)->mid = 0; 206 } 207 208 void sctp_stream_update(struct sctp_stream *stream, struct sctp_stream *new) 209 { 210 struct sctp_sched_ops *sched = sctp_sched_ops_from_stream(stream); 211 212 sched->unsched_all(stream); 213 sctp_stream_outq_migrate(stream, new, new->outcnt); 214 sctp_stream_free(stream); 215 216 stream->out = new->out; 217 stream->in = new->in; 218 stream->outcnt = new->outcnt; 219 stream->incnt = new->incnt; 220 221 sched->sched_all(stream); 222 223 new->out.tree.root = NULL; 224 new->in.tree.root = NULL; 225 new->outcnt = 0; 226 new->incnt = 0; 227 } 228 229 static int sctp_send_reconf(struct sctp_association *asoc, 230 struct sctp_chunk *chunk) 231 { 232 int retval = 0; 233 234 retval = sctp_primitive_RECONF(asoc->base.net, asoc, chunk); 235 if (retval) 236 sctp_chunk_free(chunk); 237 238 return retval; 239 } 240 241 static bool sctp_stream_outq_is_empty(struct sctp_stream *stream, 242 __u16 str_nums, __be16 *str_list) 243 { 244 struct sctp_association *asoc; 245 __u16 i; 246 247 asoc = container_of(stream, struct sctp_association, stream); 248 if (!asoc->outqueue.out_qlen) 249 return true; 250 251 if (!str_nums) 252 return false; 253 254 for (i = 0; i < str_nums; i++) { 255 __u16 sid = ntohs(str_list[i]); 256 257 if (SCTP_SO(stream, sid)->ext && 258 !list_empty(&SCTP_SO(stream, sid)->ext->outq)) 259 return false; 260 } 261 262 return true; 263 } 264 265 int sctp_send_reset_streams(struct sctp_association *asoc, 266 struct sctp_reset_streams *params) 267 { 268 struct sctp_stream *stream = &asoc->stream; 269 __u16 i, str_nums, *str_list; 270 struct sctp_chunk *chunk; 271 int retval = -EINVAL; 272 __be16 *nstr_list; 273 bool out, in; 274 275 if (!asoc->peer.reconf_capable || 276 !(asoc->strreset_enable & SCTP_ENABLE_RESET_STREAM_REQ)) { 277 retval = -ENOPROTOOPT; 278 goto out; 279 } 280 281 if (asoc->strreset_outstanding) { 282 retval = -EINPROGRESS; 283 goto out; 284 } 285 286 out = params->srs_flags & SCTP_STREAM_RESET_OUTGOING; 287 in = params->srs_flags & SCTP_STREAM_RESET_INCOMING; 288 if (!out && !in) 289 goto out; 290 291 str_nums = params->srs_number_streams; 292 str_list = params->srs_stream_list; 293 if (str_nums) { 294 int param_len = 0; 295 296 if (out) { 297 for (i = 0; i < str_nums; i++) 298 if (str_list[i] >= stream->outcnt) 299 goto out; 300 301 param_len = str_nums * sizeof(__u16) + 302 sizeof(struct sctp_strreset_outreq); 303 } 304 305 if (in) { 306 for (i = 0; i < str_nums; i++) 307 if (str_list[i] >= stream->incnt) 308 goto out; 309 310 param_len += str_nums * sizeof(__u16) + 311 sizeof(struct sctp_strreset_inreq); 312 } 313 314 if (param_len > SCTP_MAX_CHUNK_LEN - 315 sizeof(struct sctp_reconf_chunk)) 316 goto out; 317 } 318 319 nstr_list = kcalloc(str_nums, sizeof(__be16), GFP_KERNEL); 320 if (!nstr_list) { 321 retval = -ENOMEM; 322 goto out; 323 } 324 325 for (i = 0; i < str_nums; i++) 326 nstr_list[i] = htons(str_list[i]); 327 328 if (out && !sctp_stream_outq_is_empty(stream, str_nums, nstr_list)) { 329 kfree(nstr_list); 330 retval = -EAGAIN; 331 goto out; 332 } 333 334 chunk = sctp_make_strreset_req(asoc, str_nums, nstr_list, out, in); 335 336 kfree(nstr_list); 337 338 if (!chunk) { 339 retval = -ENOMEM; 340 goto out; 341 } 342 343 if (out) { 344 if (str_nums) 345 for (i = 0; i < str_nums; i++) 346 SCTP_SO(stream, str_list[i])->state = 347 SCTP_STREAM_CLOSED; 348 else 349 for (i = 0; i < stream->outcnt; i++) 350 SCTP_SO(stream, i)->state = SCTP_STREAM_CLOSED; 351 } 352 353 asoc->strreset_chunk = chunk; 354 sctp_chunk_hold(asoc->strreset_chunk); 355 356 retval = sctp_send_reconf(asoc, chunk); 357 if (retval) { 358 sctp_chunk_put(asoc->strreset_chunk); 359 asoc->strreset_chunk = NULL; 360 if (!out) 361 goto out; 362 363 if (str_nums) 364 for (i = 0; i < str_nums; i++) 365 SCTP_SO(stream, str_list[i])->state = 366 SCTP_STREAM_OPEN; 367 else 368 for (i = 0; i < stream->outcnt; i++) 369 SCTP_SO(stream, i)->state = SCTP_STREAM_OPEN; 370 371 goto out; 372 } 373 374 asoc->strreset_outstanding = out + in; 375 376 out: 377 return retval; 378 } 379 380 int sctp_send_reset_assoc(struct sctp_association *asoc) 381 { 382 struct sctp_stream *stream = &asoc->stream; 383 struct sctp_chunk *chunk = NULL; 384 int retval; 385 __u16 i; 386 387 if (!asoc->peer.reconf_capable || 388 !(asoc->strreset_enable & SCTP_ENABLE_RESET_ASSOC_REQ)) 389 return -ENOPROTOOPT; 390 391 if (asoc->strreset_outstanding) 392 return -EINPROGRESS; 393 394 if (!sctp_outq_is_empty(&asoc->outqueue)) 395 return -EAGAIN; 396 397 chunk = sctp_make_strreset_tsnreq(asoc); 398 if (!chunk) 399 return -ENOMEM; 400 401 /* Block further xmit of data until this request is completed */ 402 for (i = 0; i < stream->outcnt; i++) 403 SCTP_SO(stream, i)->state = SCTP_STREAM_CLOSED; 404 405 asoc->strreset_chunk = chunk; 406 sctp_chunk_hold(asoc->strreset_chunk); 407 408 retval = sctp_send_reconf(asoc, chunk); 409 if (retval) { 410 sctp_chunk_put(asoc->strreset_chunk); 411 asoc->strreset_chunk = NULL; 412 413 for (i = 0; i < stream->outcnt; i++) 414 SCTP_SO(stream, i)->state = SCTP_STREAM_OPEN; 415 416 return retval; 417 } 418 419 asoc->strreset_outstanding = 1; 420 421 return 0; 422 } 423 424 int sctp_send_add_streams(struct sctp_association *asoc, 425 struct sctp_add_streams *params) 426 { 427 struct sctp_stream *stream = &asoc->stream; 428 struct sctp_chunk *chunk = NULL; 429 int retval; 430 __u32 outcnt, incnt; 431 __u16 out, in; 432 433 if (!asoc->peer.reconf_capable || 434 !(asoc->strreset_enable & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 435 retval = -ENOPROTOOPT; 436 goto out; 437 } 438 439 if (asoc->strreset_outstanding) { 440 retval = -EINPROGRESS; 441 goto out; 442 } 443 444 out = params->sas_outstrms; 445 in = params->sas_instrms; 446 outcnt = stream->outcnt + out; 447 incnt = stream->incnt + in; 448 if (outcnt > SCTP_MAX_STREAM || incnt > SCTP_MAX_STREAM || 449 (!out && !in)) { 450 retval = -EINVAL; 451 goto out; 452 } 453 454 if (out) { 455 retval = sctp_stream_alloc_out(stream, outcnt, GFP_KERNEL); 456 if (retval) 457 goto out; 458 } 459 460 chunk = sctp_make_strreset_addstrm(asoc, out, in); 461 if (!chunk) { 462 retval = -ENOMEM; 463 goto out; 464 } 465 466 asoc->strreset_chunk = chunk; 467 sctp_chunk_hold(asoc->strreset_chunk); 468 469 retval = sctp_send_reconf(asoc, chunk); 470 if (retval) { 471 sctp_chunk_put(asoc->strreset_chunk); 472 asoc->strreset_chunk = NULL; 473 goto out; 474 } 475 476 asoc->strreset_outstanding = !!out + !!in; 477 478 out: 479 return retval; 480 } 481 482 static struct sctp_paramhdr *sctp_chunk_lookup_strreset_param( 483 struct sctp_association *asoc, __be32 resp_seq, 484 __be16 type) 485 { 486 struct sctp_chunk *chunk = asoc->strreset_chunk; 487 struct sctp_reconf_chunk *hdr; 488 union sctp_params param; 489 490 if (!chunk) 491 return NULL; 492 493 hdr = (struct sctp_reconf_chunk *)chunk->chunk_hdr; 494 sctp_walk_params(param, hdr) { 495 /* sctp_strreset_tsnreq is actually the basic structure 496 * of all stream reconf params, so it's safe to use it 497 * to access request_seq. 498 */ 499 struct sctp_strreset_tsnreq *req = param.v; 500 501 if ((!resp_seq || req->request_seq == resp_seq) && 502 (!type || type == req->param_hdr.type)) 503 return param.v; 504 } 505 506 return NULL; 507 } 508 509 static void sctp_update_strreset_result(struct sctp_association *asoc, 510 __u32 result) 511 { 512 asoc->strreset_result[1] = asoc->strreset_result[0]; 513 asoc->strreset_result[0] = result; 514 } 515 516 struct sctp_chunk *sctp_process_strreset_outreq( 517 struct sctp_association *asoc, 518 union sctp_params param, 519 struct sctp_ulpevent **evp) 520 { 521 struct sctp_strreset_outreq *outreq = param.v; 522 struct sctp_stream *stream = &asoc->stream; 523 __u32 result = SCTP_STRRESET_DENIED; 524 __be16 *str_p = NULL; 525 __u32 request_seq; 526 __u16 i, nums; 527 528 request_seq = ntohl(outreq->request_seq); 529 530 if (ntohl(outreq->send_reset_at_tsn) > 531 sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map)) { 532 result = SCTP_STRRESET_IN_PROGRESS; 533 goto err; 534 } 535 536 if (TSN_lt(asoc->strreset_inseq, request_seq) || 537 TSN_lt(request_seq, asoc->strreset_inseq - 2)) { 538 result = SCTP_STRRESET_ERR_BAD_SEQNO; 539 goto err; 540 } else if (TSN_lt(request_seq, asoc->strreset_inseq)) { 541 i = asoc->strreset_inseq - request_seq - 1; 542 result = asoc->strreset_result[i]; 543 goto err; 544 } 545 asoc->strreset_inseq++; 546 547 /* Check strreset_enable after inseq inc, as sender cannot tell 548 * the peer doesn't enable strreset after receiving response with 549 * result denied, as well as to keep consistent with bsd. 550 */ 551 if (!(asoc->strreset_enable & SCTP_ENABLE_RESET_STREAM_REQ)) 552 goto out; 553 554 nums = (ntohs(param.p->length) - sizeof(*outreq)) / sizeof(__u16); 555 str_p = outreq->list_of_streams; 556 for (i = 0; i < nums; i++) { 557 if (ntohs(str_p[i]) >= stream->incnt) { 558 result = SCTP_STRRESET_ERR_WRONG_SSN; 559 goto out; 560 } 561 } 562 563 if (asoc->strreset_chunk) { 564 if (!sctp_chunk_lookup_strreset_param( 565 asoc, outreq->response_seq, 566 SCTP_PARAM_RESET_IN_REQUEST)) { 567 /* same process with outstanding isn't 0 */ 568 result = SCTP_STRRESET_ERR_IN_PROGRESS; 569 goto out; 570 } 571 572 asoc->strreset_outstanding--; 573 asoc->strreset_outseq++; 574 575 if (!asoc->strreset_outstanding) { 576 struct sctp_transport *t; 577 578 t = asoc->strreset_chunk->transport; 579 if (del_timer(&t->reconf_timer)) 580 sctp_transport_put(t); 581 582 sctp_chunk_put(asoc->strreset_chunk); 583 asoc->strreset_chunk = NULL; 584 } 585 } 586 587 if (nums) 588 for (i = 0; i < nums; i++) 589 SCTP_SI(stream, ntohs(str_p[i]))->mid = 0; 590 else 591 for (i = 0; i < stream->incnt; i++) 592 SCTP_SI(stream, i)->mid = 0; 593 594 result = SCTP_STRRESET_PERFORMED; 595 596 *evp = sctp_ulpevent_make_stream_reset_event(asoc, 597 SCTP_STREAM_RESET_INCOMING_SSN, nums, str_p, GFP_ATOMIC); 598 599 out: 600 sctp_update_strreset_result(asoc, result); 601 err: 602 return sctp_make_strreset_resp(asoc, result, request_seq); 603 } 604 605 struct sctp_chunk *sctp_process_strreset_inreq( 606 struct sctp_association *asoc, 607 union sctp_params param, 608 struct sctp_ulpevent **evp) 609 { 610 struct sctp_strreset_inreq *inreq = param.v; 611 struct sctp_stream *stream = &asoc->stream; 612 __u32 result = SCTP_STRRESET_DENIED; 613 struct sctp_chunk *chunk = NULL; 614 __u32 request_seq; 615 __u16 i, nums; 616 __be16 *str_p; 617 618 request_seq = ntohl(inreq->request_seq); 619 if (TSN_lt(asoc->strreset_inseq, request_seq) || 620 TSN_lt(request_seq, asoc->strreset_inseq - 2)) { 621 result = SCTP_STRRESET_ERR_BAD_SEQNO; 622 goto err; 623 } else if (TSN_lt(request_seq, asoc->strreset_inseq)) { 624 i = asoc->strreset_inseq - request_seq - 1; 625 result = asoc->strreset_result[i]; 626 if (result == SCTP_STRRESET_PERFORMED) 627 return NULL; 628 goto err; 629 } 630 asoc->strreset_inseq++; 631 632 if (!(asoc->strreset_enable & SCTP_ENABLE_RESET_STREAM_REQ)) 633 goto out; 634 635 if (asoc->strreset_outstanding) { 636 result = SCTP_STRRESET_ERR_IN_PROGRESS; 637 goto out; 638 } 639 640 nums = (ntohs(param.p->length) - sizeof(*inreq)) / sizeof(__u16); 641 str_p = inreq->list_of_streams; 642 for (i = 0; i < nums; i++) { 643 if (ntohs(str_p[i]) >= stream->outcnt) { 644 result = SCTP_STRRESET_ERR_WRONG_SSN; 645 goto out; 646 } 647 } 648 649 if (!sctp_stream_outq_is_empty(stream, nums, str_p)) { 650 result = SCTP_STRRESET_IN_PROGRESS; 651 asoc->strreset_inseq--; 652 goto err; 653 } 654 655 chunk = sctp_make_strreset_req(asoc, nums, str_p, 1, 0); 656 if (!chunk) 657 goto out; 658 659 if (nums) 660 for (i = 0; i < nums; i++) 661 SCTP_SO(stream, ntohs(str_p[i]))->state = 662 SCTP_STREAM_CLOSED; 663 else 664 for (i = 0; i < stream->outcnt; i++) 665 SCTP_SO(stream, i)->state = SCTP_STREAM_CLOSED; 666 667 asoc->strreset_chunk = chunk; 668 asoc->strreset_outstanding = 1; 669 sctp_chunk_hold(asoc->strreset_chunk); 670 671 result = SCTP_STRRESET_PERFORMED; 672 673 out: 674 sctp_update_strreset_result(asoc, result); 675 err: 676 if (!chunk) 677 chunk = sctp_make_strreset_resp(asoc, result, request_seq); 678 679 return chunk; 680 } 681 682 struct sctp_chunk *sctp_process_strreset_tsnreq( 683 struct sctp_association *asoc, 684 union sctp_params param, 685 struct sctp_ulpevent **evp) 686 { 687 __u32 init_tsn = 0, next_tsn = 0, max_tsn_seen; 688 struct sctp_strreset_tsnreq *tsnreq = param.v; 689 struct sctp_stream *stream = &asoc->stream; 690 __u32 result = SCTP_STRRESET_DENIED; 691 __u32 request_seq; 692 __u16 i; 693 694 request_seq = ntohl(tsnreq->request_seq); 695 if (TSN_lt(asoc->strreset_inseq, request_seq) || 696 TSN_lt(request_seq, asoc->strreset_inseq - 2)) { 697 result = SCTP_STRRESET_ERR_BAD_SEQNO; 698 goto err; 699 } else if (TSN_lt(request_seq, asoc->strreset_inseq)) { 700 i = asoc->strreset_inseq - request_seq - 1; 701 result = asoc->strreset_result[i]; 702 if (result == SCTP_STRRESET_PERFORMED) { 703 next_tsn = asoc->ctsn_ack_point + 1; 704 init_tsn = 705 sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map) + 1; 706 } 707 goto err; 708 } 709 710 if (!sctp_outq_is_empty(&asoc->outqueue)) { 711 result = SCTP_STRRESET_IN_PROGRESS; 712 goto err; 713 } 714 715 asoc->strreset_inseq++; 716 717 if (!(asoc->strreset_enable & SCTP_ENABLE_RESET_ASSOC_REQ)) 718 goto out; 719 720 if (asoc->strreset_outstanding) { 721 result = SCTP_STRRESET_ERR_IN_PROGRESS; 722 goto out; 723 } 724 725 /* G4: The same processing as though a FWD-TSN chunk (as defined in 726 * [RFC3758]) with all streams affected and a new cumulative TSN 727 * ACK of the Receiver's Next TSN minus 1 were received MUST be 728 * performed. 729 */ 730 max_tsn_seen = sctp_tsnmap_get_max_tsn_seen(&asoc->peer.tsn_map); 731 asoc->stream.si->report_ftsn(&asoc->ulpq, max_tsn_seen); 732 733 /* G1: Compute an appropriate value for the Receiver's Next TSN -- the 734 * TSN that the peer should use to send the next DATA chunk. The 735 * value SHOULD be the smallest TSN not acknowledged by the 736 * receiver of the request plus 2^31. 737 */ 738 init_tsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map) + (1 << 31); 739 sctp_tsnmap_init(&asoc->peer.tsn_map, SCTP_TSN_MAP_INITIAL, 740 init_tsn, GFP_ATOMIC); 741 742 /* G3: The same processing as though a SACK chunk with no gap report 743 * and a cumulative TSN ACK of the Sender's Next TSN minus 1 were 744 * received MUST be performed. 745 */ 746 sctp_outq_free(&asoc->outqueue); 747 748 /* G2: Compute an appropriate value for the local endpoint's next TSN, 749 * i.e., the next TSN assigned by the receiver of the SSN/TSN reset 750 * chunk. The value SHOULD be the highest TSN sent by the receiver 751 * of the request plus 1. 752 */ 753 next_tsn = asoc->next_tsn; 754 asoc->ctsn_ack_point = next_tsn - 1; 755 asoc->adv_peer_ack_point = asoc->ctsn_ack_point; 756 757 /* G5: The next expected and outgoing SSNs MUST be reset to 0 for all 758 * incoming and outgoing streams. 759 */ 760 for (i = 0; i < stream->outcnt; i++) { 761 SCTP_SO(stream, i)->mid = 0; 762 SCTP_SO(stream, i)->mid_uo = 0; 763 } 764 for (i = 0; i < stream->incnt; i++) 765 SCTP_SI(stream, i)->mid = 0; 766 767 result = SCTP_STRRESET_PERFORMED; 768 769 *evp = sctp_ulpevent_make_assoc_reset_event(asoc, 0, init_tsn, 770 next_tsn, GFP_ATOMIC); 771 772 out: 773 sctp_update_strreset_result(asoc, result); 774 err: 775 return sctp_make_strreset_tsnresp(asoc, result, request_seq, 776 next_tsn, init_tsn); 777 } 778 779 struct sctp_chunk *sctp_process_strreset_addstrm_out( 780 struct sctp_association *asoc, 781 union sctp_params param, 782 struct sctp_ulpevent **evp) 783 { 784 struct sctp_strreset_addstrm *addstrm = param.v; 785 struct sctp_stream *stream = &asoc->stream; 786 __u32 result = SCTP_STRRESET_DENIED; 787 __u32 request_seq, incnt; 788 __u16 in, i; 789 790 request_seq = ntohl(addstrm->request_seq); 791 if (TSN_lt(asoc->strreset_inseq, request_seq) || 792 TSN_lt(request_seq, asoc->strreset_inseq - 2)) { 793 result = SCTP_STRRESET_ERR_BAD_SEQNO; 794 goto err; 795 } else if (TSN_lt(request_seq, asoc->strreset_inseq)) { 796 i = asoc->strreset_inseq - request_seq - 1; 797 result = asoc->strreset_result[i]; 798 goto err; 799 } 800 asoc->strreset_inseq++; 801 802 if (!(asoc->strreset_enable & SCTP_ENABLE_CHANGE_ASSOC_REQ)) 803 goto out; 804 805 in = ntohs(addstrm->number_of_streams); 806 incnt = stream->incnt + in; 807 if (!in || incnt > SCTP_MAX_STREAM) 808 goto out; 809 810 if (sctp_stream_alloc_in(stream, incnt, GFP_ATOMIC)) 811 goto out; 812 813 if (asoc->strreset_chunk) { 814 if (!sctp_chunk_lookup_strreset_param( 815 asoc, 0, SCTP_PARAM_RESET_ADD_IN_STREAMS)) { 816 /* same process with outstanding isn't 0 */ 817 result = SCTP_STRRESET_ERR_IN_PROGRESS; 818 goto out; 819 } 820 821 asoc->strreset_outstanding--; 822 asoc->strreset_outseq++; 823 824 if (!asoc->strreset_outstanding) { 825 struct sctp_transport *t; 826 827 t = asoc->strreset_chunk->transport; 828 if (del_timer(&t->reconf_timer)) 829 sctp_transport_put(t); 830 831 sctp_chunk_put(asoc->strreset_chunk); 832 asoc->strreset_chunk = NULL; 833 } 834 } 835 836 stream->incnt = incnt; 837 838 result = SCTP_STRRESET_PERFORMED; 839 840 *evp = sctp_ulpevent_make_stream_change_event(asoc, 841 0, ntohs(addstrm->number_of_streams), 0, GFP_ATOMIC); 842 843 out: 844 sctp_update_strreset_result(asoc, result); 845 err: 846 return sctp_make_strreset_resp(asoc, result, request_seq); 847 } 848 849 struct sctp_chunk *sctp_process_strreset_addstrm_in( 850 struct sctp_association *asoc, 851 union sctp_params param, 852 struct sctp_ulpevent **evp) 853 { 854 struct sctp_strreset_addstrm *addstrm = param.v; 855 struct sctp_stream *stream = &asoc->stream; 856 __u32 result = SCTP_STRRESET_DENIED; 857 struct sctp_chunk *chunk = NULL; 858 __u32 request_seq, outcnt; 859 __u16 out, i; 860 int ret; 861 862 request_seq = ntohl(addstrm->request_seq); 863 if (TSN_lt(asoc->strreset_inseq, request_seq) || 864 TSN_lt(request_seq, asoc->strreset_inseq - 2)) { 865 result = SCTP_STRRESET_ERR_BAD_SEQNO; 866 goto err; 867 } else if (TSN_lt(request_seq, asoc->strreset_inseq)) { 868 i = asoc->strreset_inseq - request_seq - 1; 869 result = asoc->strreset_result[i]; 870 if (result == SCTP_STRRESET_PERFORMED) 871 return NULL; 872 goto err; 873 } 874 asoc->strreset_inseq++; 875 876 if (!(asoc->strreset_enable & SCTP_ENABLE_CHANGE_ASSOC_REQ)) 877 goto out; 878 879 if (asoc->strreset_outstanding) { 880 result = SCTP_STRRESET_ERR_IN_PROGRESS; 881 goto out; 882 } 883 884 out = ntohs(addstrm->number_of_streams); 885 outcnt = stream->outcnt + out; 886 if (!out || outcnt > SCTP_MAX_STREAM) 887 goto out; 888 889 ret = sctp_stream_alloc_out(stream, outcnt, GFP_ATOMIC); 890 if (ret) 891 goto out; 892 893 chunk = sctp_make_strreset_addstrm(asoc, out, 0); 894 if (!chunk) 895 goto out; 896 897 asoc->strreset_chunk = chunk; 898 asoc->strreset_outstanding = 1; 899 sctp_chunk_hold(asoc->strreset_chunk); 900 901 stream->outcnt = outcnt; 902 903 result = SCTP_STRRESET_PERFORMED; 904 905 out: 906 sctp_update_strreset_result(asoc, result); 907 err: 908 if (!chunk) 909 chunk = sctp_make_strreset_resp(asoc, result, request_seq); 910 911 return chunk; 912 } 913 914 struct sctp_chunk *sctp_process_strreset_resp( 915 struct sctp_association *asoc, 916 union sctp_params param, 917 struct sctp_ulpevent **evp) 918 { 919 struct sctp_stream *stream = &asoc->stream; 920 struct sctp_strreset_resp *resp = param.v; 921 struct sctp_transport *t; 922 __u16 i, nums, flags = 0; 923 struct sctp_paramhdr *req; 924 __u32 result; 925 926 req = sctp_chunk_lookup_strreset_param(asoc, resp->response_seq, 0); 927 if (!req) 928 return NULL; 929 930 result = ntohl(resp->result); 931 if (result != SCTP_STRRESET_PERFORMED) { 932 /* if in progress, do nothing but retransmit */ 933 if (result == SCTP_STRRESET_IN_PROGRESS) 934 return NULL; 935 else if (result == SCTP_STRRESET_DENIED) 936 flags = SCTP_STREAM_RESET_DENIED; 937 else 938 flags = SCTP_STREAM_RESET_FAILED; 939 } 940 941 if (req->type == SCTP_PARAM_RESET_OUT_REQUEST) { 942 struct sctp_strreset_outreq *outreq; 943 __be16 *str_p; 944 945 outreq = (struct sctp_strreset_outreq *)req; 946 str_p = outreq->list_of_streams; 947 nums = (ntohs(outreq->param_hdr.length) - sizeof(*outreq)) / 948 sizeof(__u16); 949 950 if (result == SCTP_STRRESET_PERFORMED) { 951 struct sctp_stream_out *sout; 952 if (nums) { 953 for (i = 0; i < nums; i++) { 954 sout = SCTP_SO(stream, ntohs(str_p[i])); 955 sout->mid = 0; 956 sout->mid_uo = 0; 957 } 958 } else { 959 for (i = 0; i < stream->outcnt; i++) { 960 sout = SCTP_SO(stream, i); 961 sout->mid = 0; 962 sout->mid_uo = 0; 963 } 964 } 965 } 966 967 flags |= SCTP_STREAM_RESET_OUTGOING_SSN; 968 969 for (i = 0; i < stream->outcnt; i++) 970 SCTP_SO(stream, i)->state = SCTP_STREAM_OPEN; 971 972 *evp = sctp_ulpevent_make_stream_reset_event(asoc, flags, 973 nums, str_p, GFP_ATOMIC); 974 } else if (req->type == SCTP_PARAM_RESET_IN_REQUEST) { 975 struct sctp_strreset_inreq *inreq; 976 __be16 *str_p; 977 978 /* if the result is performed, it's impossible for inreq */ 979 if (result == SCTP_STRRESET_PERFORMED) 980 return NULL; 981 982 inreq = (struct sctp_strreset_inreq *)req; 983 str_p = inreq->list_of_streams; 984 nums = (ntohs(inreq->param_hdr.length) - sizeof(*inreq)) / 985 sizeof(__u16); 986 987 flags |= SCTP_STREAM_RESET_INCOMING_SSN; 988 989 *evp = sctp_ulpevent_make_stream_reset_event(asoc, flags, 990 nums, str_p, GFP_ATOMIC); 991 } else if (req->type == SCTP_PARAM_RESET_TSN_REQUEST) { 992 struct sctp_strreset_resptsn *resptsn; 993 __u32 stsn, rtsn; 994 995 /* check for resptsn, as sctp_verify_reconf didn't do it*/ 996 if (ntohs(param.p->length) != sizeof(*resptsn)) 997 return NULL; 998 999 resptsn = (struct sctp_strreset_resptsn *)resp; 1000 stsn = ntohl(resptsn->senders_next_tsn); 1001 rtsn = ntohl(resptsn->receivers_next_tsn); 1002 1003 if (result == SCTP_STRRESET_PERFORMED) { 1004 __u32 mtsn = sctp_tsnmap_get_max_tsn_seen( 1005 &asoc->peer.tsn_map); 1006 LIST_HEAD(temp); 1007 1008 asoc->stream.si->report_ftsn(&asoc->ulpq, mtsn); 1009 1010 sctp_tsnmap_init(&asoc->peer.tsn_map, 1011 SCTP_TSN_MAP_INITIAL, 1012 stsn, GFP_ATOMIC); 1013 1014 /* Clean up sacked and abandoned queues only. As the 1015 * out_chunk_list may not be empty, splice it to temp, 1016 * then get it back after sctp_outq_free is done. 1017 */ 1018 list_splice_init(&asoc->outqueue.out_chunk_list, &temp); 1019 sctp_outq_free(&asoc->outqueue); 1020 list_splice_init(&temp, &asoc->outqueue.out_chunk_list); 1021 1022 asoc->next_tsn = rtsn; 1023 asoc->ctsn_ack_point = asoc->next_tsn - 1; 1024 asoc->adv_peer_ack_point = asoc->ctsn_ack_point; 1025 1026 for (i = 0; i < stream->outcnt; i++) { 1027 SCTP_SO(stream, i)->mid = 0; 1028 SCTP_SO(stream, i)->mid_uo = 0; 1029 } 1030 for (i = 0; i < stream->incnt; i++) 1031 SCTP_SI(stream, i)->mid = 0; 1032 } 1033 1034 for (i = 0; i < stream->outcnt; i++) 1035 SCTP_SO(stream, i)->state = SCTP_STREAM_OPEN; 1036 1037 *evp = sctp_ulpevent_make_assoc_reset_event(asoc, flags, 1038 stsn, rtsn, GFP_ATOMIC); 1039 } else if (req->type == SCTP_PARAM_RESET_ADD_OUT_STREAMS) { 1040 struct sctp_strreset_addstrm *addstrm; 1041 __u16 number; 1042 1043 addstrm = (struct sctp_strreset_addstrm *)req; 1044 nums = ntohs(addstrm->number_of_streams); 1045 number = stream->outcnt - nums; 1046 1047 if (result == SCTP_STRRESET_PERFORMED) { 1048 for (i = number; i < stream->outcnt; i++) 1049 SCTP_SO(stream, i)->state = SCTP_STREAM_OPEN; 1050 } else { 1051 sctp_stream_shrink_out(stream, number); 1052 stream->outcnt = number; 1053 } 1054 1055 *evp = sctp_ulpevent_make_stream_change_event(asoc, flags, 1056 0, nums, GFP_ATOMIC); 1057 } else if (req->type == SCTP_PARAM_RESET_ADD_IN_STREAMS) { 1058 struct sctp_strreset_addstrm *addstrm; 1059 1060 /* if the result is performed, it's impossible for addstrm in 1061 * request. 1062 */ 1063 if (result == SCTP_STRRESET_PERFORMED) 1064 return NULL; 1065 1066 addstrm = (struct sctp_strreset_addstrm *)req; 1067 nums = ntohs(addstrm->number_of_streams); 1068 1069 *evp = sctp_ulpevent_make_stream_change_event(asoc, flags, 1070 nums, 0, GFP_ATOMIC); 1071 } 1072 1073 asoc->strreset_outstanding--; 1074 asoc->strreset_outseq++; 1075 1076 /* remove everything for this reconf request */ 1077 if (!asoc->strreset_outstanding) { 1078 t = asoc->strreset_chunk->transport; 1079 if (del_timer(&t->reconf_timer)) 1080 sctp_transport_put(t); 1081 1082 sctp_chunk_put(asoc->strreset_chunk); 1083 asoc->strreset_chunk = NULL; 1084 } 1085 1086 return NULL; 1087 } 1088