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