sctp_input.c revision 291752
1/*- 2 * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved. 3 * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved. 4 * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions are met: 8 * 9 * a) Redistributions of source code must retain the above copyright notice, 10 * this list of conditions and the following disclaimer. 11 * 12 * b) Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in 14 * the documentation and/or other materials provided with the distribution. 15 * 16 * c) Neither the name of Cisco Systems, Inc. nor the names of its 17 * contributors may be used to endorse or promote products derived 18 * from this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 22 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 24 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 30 * THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33#include <sys/cdefs.h> 34__FBSDID("$FreeBSD: head/sys/netinet/sctp_input.c 291752 2015-12-04 08:49:27Z tuexen $"); 35 36#include <netinet/sctp_os.h> 37#include <netinet/sctp_var.h> 38#include <netinet/sctp_sysctl.h> 39#include <netinet/sctp_pcb.h> 40#include <netinet/sctp_header.h> 41#include <netinet/sctputil.h> 42#include <netinet/sctp_output.h> 43#include <netinet/sctp_input.h> 44#include <netinet/sctp_auth.h> 45#include <netinet/sctp_indata.h> 46#include <netinet/sctp_asconf.h> 47#include <netinet/sctp_bsd_addr.h> 48#include <netinet/sctp_timer.h> 49#include <netinet/sctp_crc32.h> 50#if defined(INET) || defined(INET6) 51#include <netinet/udp.h> 52#endif 53#include <sys/smp.h> 54 55 56 57static void 58sctp_stop_all_cookie_timers(struct sctp_tcb *stcb) 59{ 60 struct sctp_nets *net; 61 62 /* 63 * This now not only stops all cookie timers it also stops any INIT 64 * timers as well. This will make sure that the timers are stopped 65 * in all collision cases. 66 */ 67 SCTP_TCB_LOCK_ASSERT(stcb); 68 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 69 if (net->rxt_timer.type == SCTP_TIMER_TYPE_COOKIE) { 70 sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE, 71 stcb->sctp_ep, 72 stcb, 73 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_1); 74 } else if (net->rxt_timer.type == SCTP_TIMER_TYPE_INIT) { 75 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, 76 stcb->sctp_ep, 77 stcb, 78 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_2); 79 } 80 } 81} 82 83/* INIT handler */ 84static void 85sctp_handle_init(struct mbuf *m, int iphlen, int offset, 86 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 87 struct sctp_init_chunk *cp, struct sctp_inpcb *inp, 88 struct sctp_tcb *stcb, int *abort_no_unlock, 89 uint8_t mflowtype, uint32_t mflowid, 90 uint32_t vrf_id, uint16_t port) 91{ 92 struct sctp_init *init; 93 struct mbuf *op_err; 94 95 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_init: handling INIT tcb:%p\n", 96 (void *)stcb); 97 if (stcb == NULL) { 98 SCTP_INP_RLOCK(inp); 99 } 100 /* validate length */ 101 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_chunk)) { 102 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 103 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 104 mflowtype, mflowid, 105 vrf_id, port); 106 if (stcb) 107 *abort_no_unlock = 1; 108 goto outnow; 109 } 110 /* validate parameters */ 111 init = &cp->init; 112 if (init->initiate_tag == 0) { 113 /* protocol error... send abort */ 114 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 115 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 116 mflowtype, mflowid, 117 vrf_id, port); 118 if (stcb) 119 *abort_no_unlock = 1; 120 goto outnow; 121 } 122 if (ntohl(init->a_rwnd) < SCTP_MIN_RWND) { 123 /* invalid parameter... send abort */ 124 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 125 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 126 mflowtype, mflowid, 127 vrf_id, port); 128 if (stcb) 129 *abort_no_unlock = 1; 130 goto outnow; 131 } 132 if (init->num_inbound_streams == 0) { 133 /* protocol error... send abort */ 134 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 135 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 136 mflowtype, mflowid, 137 vrf_id, port); 138 if (stcb) 139 *abort_no_unlock = 1; 140 goto outnow; 141 } 142 if (init->num_outbound_streams == 0) { 143 /* protocol error... send abort */ 144 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 145 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 146 mflowtype, mflowid, 147 vrf_id, port); 148 if (stcb) 149 *abort_no_unlock = 1; 150 goto outnow; 151 } 152 if (sctp_validate_init_auth_params(m, offset + sizeof(*cp), 153 offset + ntohs(cp->ch.chunk_length))) { 154 /* auth parameter(s) error... send abort */ 155 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 156 "Problem with AUTH parameters"); 157 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 158 mflowtype, mflowid, 159 vrf_id, port); 160 if (stcb) 161 *abort_no_unlock = 1; 162 goto outnow; 163 } 164 /* 165 * We are only accepting if we have a socket with positive 166 * so_qlimit. 167 */ 168 if ((stcb == NULL) && 169 ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 170 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) || 171 (inp->sctp_socket == NULL) || 172 (inp->sctp_socket->so_qlimit == 0))) { 173 /* 174 * FIX ME ?? What about TCP model and we have a 175 * match/restart case? Actually no fix is needed. the lookup 176 * will always find the existing assoc so stcb would not be 177 * NULL. It may be questionable to do this since we COULD 178 * just send back the INIT-ACK and hope that the app did 179 * accept()'s by the time the COOKIE was sent. But there is 180 * a price to pay for COOKIE generation and I don't want to 181 * pay it on the chance that the app will actually do some 182 * accepts(). The App just looses and should NOT be in this 183 * state :-) 184 */ 185 if (SCTP_BASE_SYSCTL(sctp_blackhole) == 0) { 186 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 187 "No listener"); 188 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err, 189 mflowtype, mflowid, inp->fibnum, 190 vrf_id, port); 191 } 192 goto outnow; 193 } 194 if ((stcb != NULL) && 195 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT)) { 196 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending SHUTDOWN-ACK\n"); 197 sctp_send_shutdown_ack(stcb, NULL); 198 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 199 } else { 200 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n"); 201 sctp_send_initiate_ack(inp, stcb, m, iphlen, offset, src, dst, 202 sh, cp, 203 mflowtype, mflowid, 204 vrf_id, port, 205 ((stcb == NULL) ? SCTP_HOLDS_LOCK : SCTP_NOT_LOCKED)); 206 } 207outnow: 208 if (stcb == NULL) { 209 SCTP_INP_RUNLOCK(inp); 210 } 211} 212 213/* 214 * process peer "INIT/INIT-ACK" chunk returns value < 0 on error 215 */ 216 217int 218sctp_is_there_unsent_data(struct sctp_tcb *stcb, int so_locked 219#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING) 220 SCTP_UNUSED 221#endif 222) 223{ 224 int unsent_data = 0; 225 unsigned int i; 226 struct sctp_stream_queue_pending *sp; 227 struct sctp_association *asoc; 228 229 /* 230 * This function returns the number of streams that have true unsent 231 * data on them. Note that as it looks through it will clean up any 232 * places that have old data that has been sent but left at top of 233 * stream queue. 234 */ 235 asoc = &stcb->asoc; 236 SCTP_TCB_SEND_LOCK(stcb); 237 if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 238 /* Check to see if some data queued */ 239 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 240 /* sa_ignore FREED_MEMORY */ 241 sp = TAILQ_FIRST(&stcb->asoc.strmout[i].outqueue); 242 if (sp == NULL) { 243 continue; 244 } 245 if ((sp->msg_is_complete) && 246 (sp->length == 0) && 247 (sp->sender_all_done)) { 248 /* 249 * We are doing differed cleanup. Last time 250 * through when we took all the data the 251 * sender_all_done was not set. 252 */ 253 if (sp->put_last_out == 0) { 254 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n"); 255 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n", 256 sp->sender_all_done, 257 sp->length, 258 sp->msg_is_complete, 259 sp->put_last_out); 260 } 261 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1); 262 TAILQ_REMOVE(&stcb->asoc.strmout[i].outqueue, sp, next); 263 if (sp->net) { 264 sctp_free_remote_addr(sp->net); 265 sp->net = NULL; 266 } 267 if (sp->data) { 268 sctp_m_freem(sp->data); 269 sp->data = NULL; 270 } 271 sctp_free_a_strmoq(stcb, sp, so_locked); 272 } else { 273 unsent_data++; 274 break; 275 } 276 } 277 } 278 SCTP_TCB_SEND_UNLOCK(stcb); 279 return (unsent_data); 280} 281 282static int 283sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb) 284{ 285 struct sctp_init *init; 286 struct sctp_association *asoc; 287 struct sctp_nets *lnet; 288 unsigned int i; 289 290 init = &cp->init; 291 asoc = &stcb->asoc; 292 /* save off parameters */ 293 asoc->peer_vtag = ntohl(init->initiate_tag); 294 asoc->peers_rwnd = ntohl(init->a_rwnd); 295 /* init tsn's */ 296 asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1; 297 298 if (!TAILQ_EMPTY(&asoc->nets)) { 299 /* update any ssthresh's that may have a default */ 300 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) { 301 lnet->ssthresh = asoc->peers_rwnd; 302 if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) { 303 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION); 304 } 305 } 306 } 307 SCTP_TCB_SEND_LOCK(stcb); 308 if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) { 309 unsigned int newcnt; 310 struct sctp_stream_out *outs; 311 struct sctp_stream_queue_pending *sp, *nsp; 312 struct sctp_tmit_chunk *chk, *nchk; 313 314 /* abandon the upper streams */ 315 newcnt = ntohs(init->num_inbound_streams); 316 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) { 317 if (chk->rec.data.stream_number >= newcnt) { 318 TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next); 319 asoc->send_queue_cnt--; 320 if (asoc->strmout[chk->rec.data.stream_number].chunks_on_queues > 0) { 321 asoc->strmout[chk->rec.data.stream_number].chunks_on_queues--; 322#ifdef INVARIANTS 323 } else { 324 panic("No chunks on the queues for sid %u.", chk->rec.data.stream_number); 325#endif 326 } 327 if (chk->data != NULL) { 328 sctp_free_bufspace(stcb, asoc, chk, 1); 329 sctp_ulp_notify(SCTP_NOTIFY_UNSENT_DG_FAIL, stcb, 330 0, chk, SCTP_SO_NOT_LOCKED); 331 if (chk->data) { 332 sctp_m_freem(chk->data); 333 chk->data = NULL; 334 } 335 } 336 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 337 /* sa_ignore FREED_MEMORY */ 338 } 339 } 340 if (asoc->strmout) { 341 for (i = newcnt; i < asoc->pre_open_streams; i++) { 342 outs = &asoc->strmout[i]; 343 TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) { 344 TAILQ_REMOVE(&outs->outqueue, sp, next); 345 asoc->stream_queue_cnt--; 346 sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL, 347 stcb, 0, sp, SCTP_SO_NOT_LOCKED); 348 if (sp->data) { 349 sctp_m_freem(sp->data); 350 sp->data = NULL; 351 } 352 if (sp->net) { 353 sctp_free_remote_addr(sp->net); 354 sp->net = NULL; 355 } 356 /* Free the chunk */ 357 sctp_free_a_strmoq(stcb, sp, SCTP_SO_NOT_LOCKED); 358 /* sa_ignore FREED_MEMORY */ 359 } 360 outs->state = SCTP_STREAM_CLOSED; 361 } 362 } 363 /* cut back the count */ 364 asoc->pre_open_streams = newcnt; 365 } 366 SCTP_TCB_SEND_UNLOCK(stcb); 367 asoc->streamoutcnt = asoc->pre_open_streams; 368 for (i = 0; i < asoc->streamoutcnt; i++) { 369 asoc->strmout[i].state = SCTP_STREAM_OPEN; 370 } 371 /* EY - nr_sack: initialize highest tsn in nr_mapping_array */ 372 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 373 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 374 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 375 } 376 /* This is the next one we expect */ 377 asoc->str_reset_seq_in = asoc->asconf_seq_in + 1; 378 379 asoc->mapping_array_base_tsn = ntohl(init->initial_tsn); 380 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in; 381 382 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 383 /* open the requested streams */ 384 385 if (asoc->strmin != NULL) { 386 /* Free the old ones */ 387 struct sctp_queued_to_read *ctl, *nctl; 388 389 for (i = 0; i < asoc->streamincnt; i++) { 390 TAILQ_FOREACH_SAFE(ctl, &asoc->strmin[i].inqueue, next, nctl) { 391 TAILQ_REMOVE(&asoc->strmin[i].inqueue, ctl, next); 392 sctp_free_remote_addr(ctl->whoFrom); 393 ctl->whoFrom = NULL; 394 sctp_m_freem(ctl->data); 395 ctl->data = NULL; 396 sctp_free_a_readq(stcb, ctl); 397 } 398 } 399 SCTP_FREE(asoc->strmin, SCTP_M_STRMI); 400 } 401 if (asoc->max_inbound_streams > ntohs(init->num_outbound_streams)) { 402 asoc->streamincnt = ntohs(init->num_outbound_streams); 403 } else { 404 asoc->streamincnt = asoc->max_inbound_streams; 405 } 406 SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt * 407 sizeof(struct sctp_stream_in), SCTP_M_STRMI); 408 if (asoc->strmin == NULL) { 409 /* we didn't get memory for the streams! */ 410 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n"); 411 return (-1); 412 } 413 for (i = 0; i < asoc->streamincnt; i++) { 414 asoc->strmin[i].stream_no = i; 415 asoc->strmin[i].last_sequence_delivered = 0xffff; 416 TAILQ_INIT(&asoc->strmin[i].inqueue); 417 asoc->strmin[i].delivery_started = 0; 418 } 419 /* 420 * load_address_from_init will put the addresses into the 421 * association when the COOKIE is processed or the INIT-ACK is 422 * processed. Both types of COOKIE's existing and new call this 423 * routine. It will remove addresses that are no longer in the 424 * association (for the restarting case where addresses are 425 * removed). Up front when the INIT arrives we will discard it if it 426 * is a restart and new addresses have been added. 427 */ 428 /* sa_ignore MEMLEAK */ 429 return (0); 430} 431 432/* 433 * INIT-ACK message processing/consumption returns value < 0 on error 434 */ 435static int 436sctp_process_init_ack(struct mbuf *m, int iphlen, int offset, 437 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 438 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 439 struct sctp_nets *net, int *abort_no_unlock, 440 uint8_t mflowtype, uint32_t mflowid, 441 uint32_t vrf_id) 442{ 443 struct sctp_association *asoc; 444 struct mbuf *op_err; 445 int retval, abort_flag; 446 uint32_t initack_limit; 447 int nat_friendly = 0; 448 449 /* First verify that we have no illegal param's */ 450 abort_flag = 0; 451 452 op_err = sctp_arethere_unrecognized_parameters(m, 453 (offset + sizeof(struct sctp_init_chunk)), 454 &abort_flag, (struct sctp_chunkhdr *)cp, &nat_friendly); 455 if (abort_flag) { 456 /* Send an abort and notify peer */ 457 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 458 *abort_no_unlock = 1; 459 return (-1); 460 } 461 asoc = &stcb->asoc; 462 asoc->peer_supports_nat = (uint8_t) nat_friendly; 463 /* process the peer's parameters in the INIT-ACK */ 464 retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb); 465 if (retval < 0) { 466 return (retval); 467 } 468 initack_limit = offset + ntohs(cp->ch.chunk_length); 469 /* load all addresses */ 470 if ((retval = sctp_load_addresses_from_init(stcb, m, 471 (offset + sizeof(struct sctp_init_chunk)), initack_limit, 472 src, dst, NULL))) { 473 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 474 "Problem with address parameters"); 475 SCTPDBG(SCTP_DEBUG_INPUT1, 476 "Load addresses from INIT causes an abort %d\n", 477 retval); 478 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 479 src, dst, sh, op_err, 480 mflowtype, mflowid, 481 vrf_id, net->port); 482 *abort_no_unlock = 1; 483 return (-1); 484 } 485 /* if the peer doesn't support asconf, flush the asconf queue */ 486 if (asoc->asconf_supported == 0) { 487 struct sctp_asconf_addr *param, *nparam; 488 489 TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) { 490 TAILQ_REMOVE(&asoc->asconf_queue, param, next); 491 SCTP_FREE(param, SCTP_M_ASC_ADDR); 492 } 493 } 494 stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs, 495 stcb->asoc.local_hmacs); 496 if (op_err) { 497 sctp_queue_op_err(stcb, op_err); 498 /* queuing will steal away the mbuf chain to the out queue */ 499 op_err = NULL; 500 } 501 /* extract the cookie and queue it to "echo" it back... */ 502 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 503 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 504 stcb->asoc.overall_error_count, 505 0, 506 SCTP_FROM_SCTP_INPUT, 507 __LINE__); 508 } 509 stcb->asoc.overall_error_count = 0; 510 net->error_count = 0; 511 512 /* 513 * Cancel the INIT timer, We do this first before queueing the 514 * cookie. We always cancel at the primary to assue that we are 515 * canceling the timer started by the INIT which always goes to the 516 * primary. 517 */ 518 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb, 519 asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3); 520 521 /* calculate the RTO */ 522 net->RTO = sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, sctp_align_safe_nocopy, 523 SCTP_RTT_FROM_NON_DATA); 524 retval = sctp_send_cookie_echo(m, offset, stcb, net); 525 if (retval < 0) { 526 /* 527 * No cookie, we probably should send a op error. But in any 528 * case if there is no cookie in the INIT-ACK, we can 529 * abandon the peer, its broke. 530 */ 531 if (retval == -3) { 532 uint16_t len; 533 534 len = (uint16_t) (sizeof(struct sctp_error_missing_param) + sizeof(uint16_t)); 535 /* We abort with an error of missing mandatory param */ 536 op_err = sctp_get_mbuf_for_msg(len, 0, M_NOWAIT, 1, MT_DATA); 537 if (op_err != NULL) { 538 struct sctp_error_missing_param *cause; 539 540 SCTP_BUF_LEN(op_err) = len; 541 cause = mtod(op_err, struct sctp_error_missing_param *); 542 /* Subtract the reserved param */ 543 cause->cause.code = htons(SCTP_CAUSE_MISSING_PARAM); 544 cause->cause.length = htons(len); 545 cause->num_missing_params = htonl(1); 546 cause->type[0] = htons(SCTP_STATE_COOKIE); 547 } 548 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 549 src, dst, sh, op_err, 550 mflowtype, mflowid, 551 vrf_id, net->port); 552 *abort_no_unlock = 1; 553 } 554 return (retval); 555 } 556 return (0); 557} 558 559static void 560sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp, 561 struct sctp_tcb *stcb, struct sctp_nets *net) 562{ 563 union sctp_sockstore store; 564 struct sctp_nets *r_net, *f_net; 565 struct timeval tv; 566 int req_prim = 0; 567 uint16_t old_error_counter; 568 569 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) { 570 /* Invalid length */ 571 return; 572 } 573 memset(&store, 0, sizeof(store)); 574 switch (cp->heartbeat.hb_info.addr_family) { 575#ifdef INET 576 case AF_INET: 577 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) { 578 store.sin.sin_family = cp->heartbeat.hb_info.addr_family; 579 store.sin.sin_len = cp->heartbeat.hb_info.addr_len; 580 store.sin.sin_port = stcb->rport; 581 memcpy(&store.sin.sin_addr, cp->heartbeat.hb_info.address, 582 sizeof(store.sin.sin_addr)); 583 } else { 584 return; 585 } 586 break; 587#endif 588#ifdef INET6 589 case AF_INET6: 590 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) { 591 store.sin6.sin6_family = cp->heartbeat.hb_info.addr_family; 592 store.sin6.sin6_len = cp->heartbeat.hb_info.addr_len; 593 store.sin6.sin6_port = stcb->rport; 594 memcpy(&store.sin6.sin6_addr, cp->heartbeat.hb_info.address, sizeof(struct in6_addr)); 595 } else { 596 return; 597 } 598 break; 599#endif 600 default: 601 return; 602 } 603 r_net = sctp_findnet(stcb, &store.sa); 604 if (r_net == NULL) { 605 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n"); 606 return; 607 } 608 if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) && 609 (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) && 610 (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) { 611 /* 612 * If the its a HB and it's random value is correct when can 613 * confirm the destination. 614 */ 615 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 616 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) { 617 stcb->asoc.primary_destination = r_net; 618 r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY; 619 f_net = TAILQ_FIRST(&stcb->asoc.nets); 620 if (f_net != r_net) { 621 /* 622 * first one on the list is NOT the primary 623 * sctp_cmpaddr() is much more efficent if 624 * the primary is the first on the list, 625 * make it so. 626 */ 627 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next); 628 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next); 629 } 630 req_prim = 1; 631 } 632 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 633 stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 634 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, 635 r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4); 636 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 637 } 638 old_error_counter = r_net->error_count; 639 r_net->error_count = 0; 640 r_net->hb_responded = 1; 641 tv.tv_sec = cp->heartbeat.hb_info.time_value_1; 642 tv.tv_usec = cp->heartbeat.hb_info.time_value_2; 643 /* Now lets do a RTO with this */ 644 r_net->RTO = sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, sctp_align_safe_nocopy, 645 SCTP_RTT_FROM_NON_DATA); 646 if (!(r_net->dest_state & SCTP_ADDR_REACHABLE)) { 647 r_net->dest_state |= SCTP_ADDR_REACHABLE; 648 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb, 649 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 650 } 651 if (r_net->dest_state & SCTP_ADDR_PF) { 652 r_net->dest_state &= ~SCTP_ADDR_PF; 653 stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net); 654 } 655 if (old_error_counter > 0) { 656 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 657 stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_5); 658 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 659 } 660 if (r_net == stcb->asoc.primary_destination) { 661 if (stcb->asoc.alternate) { 662 /* release the alternate, primary is good */ 663 sctp_free_remote_addr(stcb->asoc.alternate); 664 stcb->asoc.alternate = NULL; 665 } 666 } 667 /* Mobility adaptation */ 668 if (req_prim) { 669 if ((sctp_is_mobility_feature_on(stcb->sctp_ep, 670 SCTP_MOBILITY_BASE) || 671 sctp_is_mobility_feature_on(stcb->sctp_ep, 672 SCTP_MOBILITY_FASTHANDOFF)) && 673 sctp_is_mobility_feature_on(stcb->sctp_ep, 674 SCTP_MOBILITY_PRIM_DELETED)) { 675 676 sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED, 677 stcb->sctp_ep, stcb, NULL, 678 SCTP_FROM_SCTP_INPUT + SCTP_LOC_6); 679 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 680 SCTP_MOBILITY_FASTHANDOFF)) { 681 sctp_assoc_immediate_retrans(stcb, 682 stcb->asoc.primary_destination); 683 } 684 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 685 SCTP_MOBILITY_BASE)) { 686 sctp_move_chunks_from_net(stcb, 687 stcb->asoc.deleted_primary); 688 } 689 sctp_delete_prim_timer(stcb->sctp_ep, stcb, 690 stcb->asoc.deleted_primary); 691 } 692 } 693} 694 695static int 696sctp_handle_nat_colliding_state(struct sctp_tcb *stcb) 697{ 698 /* 699 * return 0 means we want you to proceed with the abort non-zero 700 * means no abort processing 701 */ 702 struct sctpasochead *head; 703 704 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_WAIT) { 705 /* generate a new vtag and send init */ 706 LIST_REMOVE(stcb, sctp_asocs); 707 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 708 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 709 /* 710 * put it in the bucket in the vtag hash of assoc's for the 711 * system 712 */ 713 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 714 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 715 return (1); 716 } 717 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) { 718 /* 719 * treat like a case where the cookie expired i.e.: - dump 720 * current cookie. - generate a new vtag. - resend init. 721 */ 722 /* generate a new vtag and send init */ 723 LIST_REMOVE(stcb, sctp_asocs); 724 stcb->asoc.state &= ~SCTP_STATE_COOKIE_ECHOED; 725 stcb->asoc.state |= SCTP_STATE_COOKIE_WAIT; 726 sctp_stop_all_cookie_timers(stcb); 727 sctp_toss_old_cookies(stcb, &stcb->asoc); 728 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 729 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 730 /* 731 * put it in the bucket in the vtag hash of assoc's for the 732 * system 733 */ 734 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 735 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 736 return (1); 737 } 738 return (0); 739} 740 741static int 742sctp_handle_nat_missing_state(struct sctp_tcb *stcb, 743 struct sctp_nets *net) 744{ 745 /* 746 * return 0 means we want you to proceed with the abort non-zero 747 * means no abort processing 748 */ 749 if (stcb->asoc.auth_supported == 0) { 750 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n"); 751 return (0); 752 } 753 sctp_asconf_send_nat_state_update(stcb, net); 754 return (1); 755} 756 757 758static void 759sctp_handle_abort(struct sctp_abort_chunk *abort, 760 struct sctp_tcb *stcb, struct sctp_nets *net) 761{ 762#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 763 struct socket *so; 764 765#endif 766 uint16_t len; 767 uint16_t error; 768 769 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n"); 770 if (stcb == NULL) 771 return; 772 773 len = ntohs(abort->ch.chunk_length); 774 if (len > sizeof(struct sctp_chunkhdr)) { 775 /* 776 * Need to check the cause codes for our two magic nat 777 * aborts which don't kill the assoc necessarily. 778 */ 779 struct sctp_gen_error_cause *cause; 780 781 cause = (struct sctp_gen_error_cause *)(abort + 1); 782 error = ntohs(cause->code); 783 if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) { 784 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n", 785 abort->ch.chunk_flags); 786 if (sctp_handle_nat_colliding_state(stcb)) { 787 return; 788 } 789 } else if (error == SCTP_CAUSE_NAT_MISSING_STATE) { 790 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n", 791 abort->ch.chunk_flags); 792 if (sctp_handle_nat_missing_state(stcb, net)) { 793 return; 794 } 795 } 796 } else { 797 error = 0; 798 } 799 /* stop any receive timers */ 800 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net, 801 SCTP_FROM_SCTP_INPUT + SCTP_LOC_7); 802 /* notify user of the abort and clean up... */ 803 sctp_abort_notification(stcb, 1, error, abort, SCTP_SO_NOT_LOCKED); 804 /* free the tcb */ 805 SCTP_STAT_INCR_COUNTER32(sctps_aborted); 806 if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) || 807 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 808 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 809 } 810#ifdef SCTP_ASOCLOG_OF_TSNS 811 sctp_print_out_track_log(stcb); 812#endif 813#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 814 so = SCTP_INP_SO(stcb->sctp_ep); 815 atomic_add_int(&stcb->asoc.refcnt, 1); 816 SCTP_TCB_UNLOCK(stcb); 817 SCTP_SOCKET_LOCK(so, 1); 818 SCTP_TCB_LOCK(stcb); 819 atomic_subtract_int(&stcb->asoc.refcnt, 1); 820#endif 821 stcb->asoc.state |= SCTP_STATE_WAS_ABORTED; 822 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 823 SCTP_FROM_SCTP_INPUT + SCTP_LOC_8); 824#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 825 SCTP_SOCKET_UNLOCK(so, 1); 826#endif 827 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n"); 828} 829 830static void 831sctp_start_net_timers(struct sctp_tcb *stcb) 832{ 833 uint32_t cnt_hb_sent; 834 struct sctp_nets *net; 835 836 cnt_hb_sent = 0; 837 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 838 /* 839 * For each network start: 1) A pmtu timer. 2) A HB timer 3) 840 * If the dest in unconfirmed send a hb as well if under 841 * max_hb_burst have been sent. 842 */ 843 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net); 844 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net); 845 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) && 846 (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) { 847 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 848 cnt_hb_sent++; 849 } 850 } 851 if (cnt_hb_sent) { 852 sctp_chunk_output(stcb->sctp_ep, stcb, 853 SCTP_OUTPUT_FROM_COOKIE_ACK, 854 SCTP_SO_NOT_LOCKED); 855 } 856} 857 858 859static void 860sctp_handle_shutdown(struct sctp_shutdown_chunk *cp, 861 struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag) 862{ 863 struct sctp_association *asoc; 864 int some_on_streamwheel; 865 int old_state; 866 867#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 868 struct socket *so; 869 870#endif 871 872 SCTPDBG(SCTP_DEBUG_INPUT2, 873 "sctp_handle_shutdown: handling SHUTDOWN\n"); 874 if (stcb == NULL) 875 return; 876 asoc = &stcb->asoc; 877 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) || 878 (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) { 879 return; 880 } 881 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) { 882 /* Shutdown NOT the expected size */ 883 return; 884 } 885 old_state = SCTP_GET_STATE(asoc); 886 sctp_update_acked(stcb, cp, abort_flag); 887 if (*abort_flag) { 888 return; 889 } 890 if (asoc->control_pdapi) { 891 /* 892 * With a normal shutdown we assume the end of last record. 893 */ 894 SCTP_INP_READ_LOCK(stcb->sctp_ep); 895 asoc->control_pdapi->end_added = 1; 896 asoc->control_pdapi->pdapi_aborted = 1; 897 asoc->control_pdapi = NULL; 898 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 899#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 900 so = SCTP_INP_SO(stcb->sctp_ep); 901 atomic_add_int(&stcb->asoc.refcnt, 1); 902 SCTP_TCB_UNLOCK(stcb); 903 SCTP_SOCKET_LOCK(so, 1); 904 SCTP_TCB_LOCK(stcb); 905 atomic_subtract_int(&stcb->asoc.refcnt, 1); 906 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 907 /* assoc was freed while we were unlocked */ 908 SCTP_SOCKET_UNLOCK(so, 1); 909 return; 910 } 911#endif 912 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 913#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 914 SCTP_SOCKET_UNLOCK(so, 1); 915#endif 916 } 917 /* goto SHUTDOWN_RECEIVED state to block new requests */ 918 if (stcb->sctp_socket) { 919 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) && 920 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) && 921 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) { 922 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_RECEIVED); 923 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 924 /* 925 * notify upper layer that peer has initiated a 926 * shutdown 927 */ 928 sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 929 930 /* reset time */ 931 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 932 } 933 } 934 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) { 935 /* 936 * stop the shutdown timer, since we WILL move to 937 * SHUTDOWN-ACK-SENT. 938 */ 939 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, 940 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9); 941 } 942 /* Now is there unsent data on a stream somewhere? */ 943 some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED); 944 945 if (!TAILQ_EMPTY(&asoc->send_queue) || 946 !TAILQ_EMPTY(&asoc->sent_queue) || 947 some_on_streamwheel) { 948 /* By returning we will push more data out */ 949 return; 950 } else { 951 /* no outstanding data to send, so move on... */ 952 /* send SHUTDOWN-ACK */ 953 /* move to SHUTDOWN-ACK-SENT state */ 954 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) || 955 (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 956 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 957 } 958 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 959 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 960 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT); 961 sctp_stop_timers_for_shutdown(stcb); 962 sctp_send_shutdown_ack(stcb, net); 963 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, 964 stcb->sctp_ep, stcb, net); 965 } else if (old_state == SCTP_STATE_SHUTDOWN_ACK_SENT) { 966 sctp_send_shutdown_ack(stcb, net); 967 } 968 } 969} 970 971static void 972sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED, 973 struct sctp_tcb *stcb, 974 struct sctp_nets *net) 975{ 976 struct sctp_association *asoc; 977 978#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 979 struct socket *so; 980 981 so = SCTP_INP_SO(stcb->sctp_ep); 982#endif 983 SCTPDBG(SCTP_DEBUG_INPUT2, 984 "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n"); 985 if (stcb == NULL) 986 return; 987 988 asoc = &stcb->asoc; 989 /* process according to association state */ 990 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) || 991 (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) { 992 /* unexpected SHUTDOWN-ACK... do OOTB handling... */ 993 sctp_send_shutdown_complete(stcb, net, 1); 994 SCTP_TCB_UNLOCK(stcb); 995 return; 996 } 997 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) && 998 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) { 999 /* unexpected SHUTDOWN-ACK... so ignore... */ 1000 SCTP_TCB_UNLOCK(stcb); 1001 return; 1002 } 1003 if (asoc->control_pdapi) { 1004 /* 1005 * With a normal shutdown we assume the end of last record. 1006 */ 1007 SCTP_INP_READ_LOCK(stcb->sctp_ep); 1008 asoc->control_pdapi->end_added = 1; 1009 asoc->control_pdapi->pdapi_aborted = 1; 1010 asoc->control_pdapi = NULL; 1011 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 1012#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1013 atomic_add_int(&stcb->asoc.refcnt, 1); 1014 SCTP_TCB_UNLOCK(stcb); 1015 SCTP_SOCKET_LOCK(so, 1); 1016 SCTP_TCB_LOCK(stcb); 1017 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1018 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1019 /* assoc was freed while we were unlocked */ 1020 SCTP_SOCKET_UNLOCK(so, 1); 1021 return; 1022 } 1023#endif 1024 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 1025#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1026 SCTP_SOCKET_UNLOCK(so, 1); 1027#endif 1028 } 1029#ifdef INVARIANTS 1030 if (!TAILQ_EMPTY(&asoc->send_queue) || 1031 !TAILQ_EMPTY(&asoc->sent_queue) || 1032 !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 1033 panic("Queues are not empty when handling SHUTDOWN-ACK"); 1034 } 1035#endif 1036 /* stop the timer */ 1037 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, 1038 SCTP_FROM_SCTP_INPUT + SCTP_LOC_10); 1039 /* send SHUTDOWN-COMPLETE */ 1040 sctp_send_shutdown_complete(stcb, net, 0); 1041 /* notify upper layer protocol */ 1042 if (stcb->sctp_socket) { 1043 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1044 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 1045 stcb->sctp_socket->so_snd.sb_cc = 0; 1046 } 1047 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 1048 } 1049 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 1050 /* free the TCB but first save off the ep */ 1051#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1052 atomic_add_int(&stcb->asoc.refcnt, 1); 1053 SCTP_TCB_UNLOCK(stcb); 1054 SCTP_SOCKET_LOCK(so, 1); 1055 SCTP_TCB_LOCK(stcb); 1056 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1057#endif 1058 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1059 SCTP_FROM_SCTP_INPUT + SCTP_LOC_11); 1060#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1061 SCTP_SOCKET_UNLOCK(so, 1); 1062#endif 1063} 1064 1065/* 1066 * Skip past the param header and then we will find the chunk that caused the 1067 * problem. There are two possiblities ASCONF or FWD-TSN other than that and 1068 * our peer must be broken. 1069 */ 1070static void 1071sctp_process_unrecog_chunk(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr, 1072 struct sctp_nets *net) 1073{ 1074 struct sctp_chunkhdr *chk; 1075 1076 chk = (struct sctp_chunkhdr *)((caddr_t)phdr + sizeof(*phdr)); 1077 switch (chk->chunk_type) { 1078 case SCTP_ASCONF_ACK: 1079 case SCTP_ASCONF: 1080 sctp_asconf_cleanup(stcb, net); 1081 break; 1082 case SCTP_FORWARD_CUM_TSN: 1083 stcb->asoc.prsctp_supported = 0; 1084 break; 1085 default: 1086 SCTPDBG(SCTP_DEBUG_INPUT2, 1087 "Peer does not support chunk type %d(%x)??\n", 1088 chk->chunk_type, (uint32_t) chk->chunk_type); 1089 break; 1090 } 1091} 1092 1093/* 1094 * Skip past the param header and then we will find the param that caused the 1095 * problem. There are a number of param's in a ASCONF OR the prsctp param 1096 * these will turn of specific features. 1097 * XXX: Is this the right thing to do? 1098 */ 1099static void 1100sctp_process_unrecog_param(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr) 1101{ 1102 struct sctp_paramhdr *pbad; 1103 1104 pbad = phdr + 1; 1105 switch (ntohs(pbad->param_type)) { 1106 /* pr-sctp draft */ 1107 case SCTP_PRSCTP_SUPPORTED: 1108 stcb->asoc.prsctp_supported = 0; 1109 break; 1110 case SCTP_SUPPORTED_CHUNK_EXT: 1111 break; 1112 /* draft-ietf-tsvwg-addip-sctp */ 1113 case SCTP_HAS_NAT_SUPPORT: 1114 stcb->asoc.peer_supports_nat = 0; 1115 break; 1116 case SCTP_ADD_IP_ADDRESS: 1117 case SCTP_DEL_IP_ADDRESS: 1118 case SCTP_SET_PRIM_ADDR: 1119 stcb->asoc.asconf_supported = 0; 1120 break; 1121 case SCTP_SUCCESS_REPORT: 1122 case SCTP_ERROR_CAUSE_IND: 1123 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n"); 1124 SCTPDBG(SCTP_DEBUG_INPUT2, 1125 "Turning off ASCONF to this strange peer\n"); 1126 stcb->asoc.asconf_supported = 0; 1127 break; 1128 default: 1129 SCTPDBG(SCTP_DEBUG_INPUT2, 1130 "Peer does not support param type %d(%x)??\n", 1131 pbad->param_type, (uint32_t) pbad->param_type); 1132 break; 1133 } 1134} 1135 1136static int 1137sctp_handle_error(struct sctp_chunkhdr *ch, 1138 struct sctp_tcb *stcb, struct sctp_nets *net) 1139{ 1140 int chklen; 1141 struct sctp_paramhdr *phdr; 1142 uint16_t error, error_type; 1143 uint16_t error_len; 1144 struct sctp_association *asoc; 1145 int adjust; 1146 1147#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1148 struct socket *so; 1149 1150#endif 1151 1152 /* parse through all of the errors and process */ 1153 asoc = &stcb->asoc; 1154 phdr = (struct sctp_paramhdr *)((caddr_t)ch + 1155 sizeof(struct sctp_chunkhdr)); 1156 chklen = ntohs(ch->chunk_length) - sizeof(struct sctp_chunkhdr); 1157 error = 0; 1158 while ((size_t)chklen >= sizeof(struct sctp_paramhdr)) { 1159 /* Process an Error Cause */ 1160 error_type = ntohs(phdr->param_type); 1161 error_len = ntohs(phdr->param_length); 1162 if ((error_len > chklen) || (error_len == 0)) { 1163 /* invalid param length for this param */ 1164 SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in error param- chunk left:%d errorlen:%d\n", 1165 chklen, error_len); 1166 return (0); 1167 } 1168 if (error == 0) { 1169 /* report the first error cause */ 1170 error = error_type; 1171 } 1172 switch (error_type) { 1173 case SCTP_CAUSE_INVALID_STREAM: 1174 case SCTP_CAUSE_MISSING_PARAM: 1175 case SCTP_CAUSE_INVALID_PARAM: 1176 case SCTP_CAUSE_NO_USER_DATA: 1177 SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %d back? We have a bug :/ (or do they?)\n", 1178 error_type); 1179 break; 1180 case SCTP_CAUSE_NAT_COLLIDING_STATE: 1181 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n", 1182 ch->chunk_flags); 1183 if (sctp_handle_nat_colliding_state(stcb)) { 1184 return (0); 1185 } 1186 break; 1187 case SCTP_CAUSE_NAT_MISSING_STATE: 1188 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n", 1189 ch->chunk_flags); 1190 if (sctp_handle_nat_missing_state(stcb, net)) { 1191 return (0); 1192 } 1193 break; 1194 case SCTP_CAUSE_STALE_COOKIE: 1195 /* 1196 * We only act if we have echoed a cookie and are 1197 * waiting. 1198 */ 1199 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) { 1200 int *p; 1201 1202 p = (int *)((caddr_t)phdr + sizeof(*phdr)); 1203 /* Save the time doubled */ 1204 asoc->cookie_preserve_req = ntohl(*p) << 1; 1205 asoc->stale_cookie_count++; 1206 if (asoc->stale_cookie_count > 1207 asoc->max_init_times) { 1208 sctp_abort_notification(stcb, 0, 0, NULL, SCTP_SO_NOT_LOCKED); 1209 /* now free the asoc */ 1210#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1211 so = SCTP_INP_SO(stcb->sctp_ep); 1212 atomic_add_int(&stcb->asoc.refcnt, 1); 1213 SCTP_TCB_UNLOCK(stcb); 1214 SCTP_SOCKET_LOCK(so, 1); 1215 SCTP_TCB_LOCK(stcb); 1216 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1217#endif 1218 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1219 SCTP_FROM_SCTP_INPUT + SCTP_LOC_12); 1220#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1221 SCTP_SOCKET_UNLOCK(so, 1); 1222#endif 1223 return (-1); 1224 } 1225 /* blast back to INIT state */ 1226 sctp_toss_old_cookies(stcb, &stcb->asoc); 1227 asoc->state &= ~SCTP_STATE_COOKIE_ECHOED; 1228 asoc->state |= SCTP_STATE_COOKIE_WAIT; 1229 sctp_stop_all_cookie_timers(stcb); 1230 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 1231 } 1232 break; 1233 case SCTP_CAUSE_UNRESOLVABLE_ADDR: 1234 /* 1235 * Nothing we can do here, we don't do hostname 1236 * addresses so if the peer does not like my IPv6 1237 * (or IPv4 for that matter) it does not matter. If 1238 * they don't support that type of address, they can 1239 * NOT possibly get that packet type... i.e. with no 1240 * IPv6 you can't recieve a IPv6 packet. so we can 1241 * safely ignore this one. If we ever added support 1242 * for HOSTNAME Addresses, then we would need to do 1243 * something here. 1244 */ 1245 break; 1246 case SCTP_CAUSE_UNRECOG_CHUNK: 1247 sctp_process_unrecog_chunk(stcb, phdr, net); 1248 break; 1249 case SCTP_CAUSE_UNRECOG_PARAM: 1250 sctp_process_unrecog_param(stcb, phdr); 1251 break; 1252 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN: 1253 /* 1254 * We ignore this since the timer will drive out a 1255 * new cookie anyway and there timer will drive us 1256 * to send a SHUTDOWN_COMPLETE. We can't send one 1257 * here since we don't have their tag. 1258 */ 1259 break; 1260 case SCTP_CAUSE_DELETING_LAST_ADDR: 1261 case SCTP_CAUSE_RESOURCE_SHORTAGE: 1262 case SCTP_CAUSE_DELETING_SRC_ADDR: 1263 /* 1264 * We should NOT get these here, but in a 1265 * ASCONF-ACK. 1266 */ 1267 SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a Operational Error?<%d>?\n", 1268 error_type); 1269 break; 1270 case SCTP_CAUSE_OUT_OF_RESC: 1271 /* 1272 * And what, pray tell do we do with the fact that 1273 * the peer is out of resources? Not really sure we 1274 * could do anything but abort. I suspect this 1275 * should have came WITH an abort instead of in a 1276 * OP-ERROR. 1277 */ 1278 break; 1279 default: 1280 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown error type = 0x%xh\n", 1281 error_type); 1282 break; 1283 } 1284 adjust = SCTP_SIZE32(error_len); 1285 chklen -= adjust; 1286 phdr = (struct sctp_paramhdr *)((caddr_t)phdr + adjust); 1287 } 1288 sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, error, ch, SCTP_SO_NOT_LOCKED); 1289 return (0); 1290} 1291 1292static int 1293sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset, 1294 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 1295 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 1296 struct sctp_nets *net, int *abort_no_unlock, 1297 uint8_t mflowtype, uint32_t mflowid, 1298 uint32_t vrf_id) 1299{ 1300 struct sctp_init_ack *init_ack; 1301 struct mbuf *op_err; 1302 1303 SCTPDBG(SCTP_DEBUG_INPUT2, 1304 "sctp_handle_init_ack: handling INIT-ACK\n"); 1305 1306 if (stcb == NULL) { 1307 SCTPDBG(SCTP_DEBUG_INPUT2, 1308 "sctp_handle_init_ack: TCB is null\n"); 1309 return (-1); 1310 } 1311 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) { 1312 /* Invalid length */ 1313 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1314 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1315 src, dst, sh, op_err, 1316 mflowtype, mflowid, 1317 vrf_id, net->port); 1318 *abort_no_unlock = 1; 1319 return (-1); 1320 } 1321 init_ack = &cp->init; 1322 /* validate parameters */ 1323 if (init_ack->initiate_tag == 0) { 1324 /* protocol error... send an abort */ 1325 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1326 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1327 src, dst, sh, op_err, 1328 mflowtype, mflowid, 1329 vrf_id, net->port); 1330 *abort_no_unlock = 1; 1331 return (-1); 1332 } 1333 if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) { 1334 /* protocol error... send an abort */ 1335 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1336 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1337 src, dst, sh, op_err, 1338 mflowtype, mflowid, 1339 vrf_id, net->port); 1340 *abort_no_unlock = 1; 1341 return (-1); 1342 } 1343 if (init_ack->num_inbound_streams == 0) { 1344 /* protocol error... send an abort */ 1345 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1346 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1347 src, dst, sh, op_err, 1348 mflowtype, mflowid, 1349 vrf_id, net->port); 1350 *abort_no_unlock = 1; 1351 return (-1); 1352 } 1353 if (init_ack->num_outbound_streams == 0) { 1354 /* protocol error... send an abort */ 1355 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1356 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1357 src, dst, sh, op_err, 1358 mflowtype, mflowid, 1359 vrf_id, net->port); 1360 *abort_no_unlock = 1; 1361 return (-1); 1362 } 1363 /* process according to association state... */ 1364 switch (stcb->asoc.state & SCTP_STATE_MASK) { 1365 case SCTP_STATE_COOKIE_WAIT: 1366 /* this is the expected state for this chunk */ 1367 /* process the INIT-ACK parameters */ 1368 if (stcb->asoc.primary_destination->dest_state & 1369 SCTP_ADDR_UNCONFIRMED) { 1370 /* 1371 * The primary is where we sent the INIT, we can 1372 * always consider it confirmed when the INIT-ACK is 1373 * returned. Do this before we load addresses 1374 * though. 1375 */ 1376 stcb->asoc.primary_destination->dest_state &= 1377 ~SCTP_ADDR_UNCONFIRMED; 1378 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 1379 stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED); 1380 } 1381 if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb, 1382 net, abort_no_unlock, 1383 mflowtype, mflowid, 1384 vrf_id) < 0) { 1385 /* error in parsing parameters */ 1386 return (-1); 1387 } 1388 /* update our state */ 1389 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n"); 1390 SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_ECHOED); 1391 1392 /* reset the RTO calc */ 1393 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 1394 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 1395 stcb->asoc.overall_error_count, 1396 0, 1397 SCTP_FROM_SCTP_INPUT, 1398 __LINE__); 1399 } 1400 stcb->asoc.overall_error_count = 0; 1401 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 1402 /* 1403 * collapse the init timer back in case of a exponential 1404 * backoff 1405 */ 1406 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep, 1407 stcb, net); 1408 /* 1409 * the send at the end of the inbound data processing will 1410 * cause the cookie to be sent 1411 */ 1412 break; 1413 case SCTP_STATE_SHUTDOWN_SENT: 1414 /* incorrect state... discard */ 1415 break; 1416 case SCTP_STATE_COOKIE_ECHOED: 1417 /* incorrect state... discard */ 1418 break; 1419 case SCTP_STATE_OPEN: 1420 /* incorrect state... discard */ 1421 break; 1422 case SCTP_STATE_EMPTY: 1423 case SCTP_STATE_INUSE: 1424 default: 1425 /* incorrect state... discard */ 1426 return (-1); 1427 break; 1428 } 1429 SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n"); 1430 return (0); 1431} 1432 1433static struct sctp_tcb * 1434sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1435 struct sockaddr *src, struct sockaddr *dst, 1436 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1437 struct sctp_inpcb *inp, struct sctp_nets **netp, 1438 struct sockaddr *init_src, int *notification, 1439 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1440 uint8_t mflowtype, uint32_t mflowid, 1441 uint32_t vrf_id, uint16_t port); 1442 1443 1444/* 1445 * handle a state cookie for an existing association m: input packet mbuf 1446 * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a 1447 * "split" mbuf and the cookie signature does not exist offset: offset into 1448 * mbuf to the cookie-echo chunk 1449 */ 1450static struct sctp_tcb * 1451sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset, 1452 struct sockaddr *src, struct sockaddr *dst, 1453 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1454 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp, 1455 struct sockaddr *init_src, int *notification, 1456 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1457 uint8_t mflowtype, uint32_t mflowid, 1458 uint32_t vrf_id, uint16_t port) 1459{ 1460 struct sctp_association *asoc; 1461 struct sctp_init_chunk *init_cp, init_buf; 1462 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1463 struct sctp_nets *net; 1464 struct mbuf *op_err; 1465 int init_offset, initack_offset, i; 1466 int retval; 1467 int spec_flag = 0; 1468 uint32_t how_indx; 1469 1470#if defined(SCTP_DETAILED_STR_STATS) 1471 int j; 1472 1473#endif 1474 1475 net = *netp; 1476 /* I know that the TCB is non-NULL from the caller */ 1477 asoc = &stcb->asoc; 1478 for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) { 1479 if (asoc->cookie_how[how_indx] == 0) 1480 break; 1481 } 1482 if (how_indx < sizeof(asoc->cookie_how)) { 1483 asoc->cookie_how[how_indx] = 1; 1484 } 1485 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 1486 /* SHUTDOWN came in after sending INIT-ACK */ 1487 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination); 1488 op_err = sctp_generate_cause(SCTP_CAUSE_COOKIE_IN_SHUTDOWN, ""); 1489 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 1490 mflowtype, mflowid, inp->fibnum, 1491 vrf_id, net->port); 1492 if (how_indx < sizeof(asoc->cookie_how)) 1493 asoc->cookie_how[how_indx] = 2; 1494 return (NULL); 1495 } 1496 /* 1497 * find and validate the INIT chunk in the cookie (peer's info) the 1498 * INIT should start after the cookie-echo header struct (chunk 1499 * header, state cookie header struct) 1500 */ 1501 init_offset = offset += sizeof(struct sctp_cookie_echo_chunk); 1502 1503 init_cp = (struct sctp_init_chunk *) 1504 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 1505 (uint8_t *) & init_buf); 1506 if (init_cp == NULL) { 1507 /* could not pull a INIT chunk in cookie */ 1508 return (NULL); 1509 } 1510 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 1511 return (NULL); 1512 } 1513 /* 1514 * find and validate the INIT-ACK chunk in the cookie (my info) the 1515 * INIT-ACK follows the INIT chunk 1516 */ 1517 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 1518 initack_cp = (struct sctp_init_ack_chunk *) 1519 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 1520 (uint8_t *) & initack_buf); 1521 if (initack_cp == NULL) { 1522 /* could not pull INIT-ACK chunk in cookie */ 1523 return (NULL); 1524 } 1525 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 1526 return (NULL); 1527 } 1528 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1529 (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) { 1530 /* 1531 * case D in Section 5.2.4 Table 2: MMAA process accordingly 1532 * to get into the OPEN state 1533 */ 1534 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1535 /*- 1536 * Opps, this means that we somehow generated two vtag's 1537 * the same. I.e. we did: 1538 * Us Peer 1539 * <---INIT(tag=a)------ 1540 * ----INIT-ACK(tag=t)--> 1541 * ----INIT(tag=t)------> *1 1542 * <---INIT-ACK(tag=a)--- 1543 * <----CE(tag=t)------------- *2 1544 * 1545 * At point *1 we should be generating a different 1546 * tag t'. Which means we would throw away the CE and send 1547 * ours instead. Basically this is case C (throw away side). 1548 */ 1549 if (how_indx < sizeof(asoc->cookie_how)) 1550 asoc->cookie_how[how_indx] = 17; 1551 return (NULL); 1552 1553 } 1554 switch (SCTP_GET_STATE(asoc)) { 1555 case SCTP_STATE_COOKIE_WAIT: 1556 case SCTP_STATE_COOKIE_ECHOED: 1557 /* 1558 * INIT was sent but got a COOKIE_ECHO with the 1559 * correct tags... just accept it...but we must 1560 * process the init so that we can make sure we have 1561 * the right seq no's. 1562 */ 1563 /* First we must process the INIT !! */ 1564 retval = sctp_process_init(init_cp, stcb); 1565 if (retval < 0) { 1566 if (how_indx < sizeof(asoc->cookie_how)) 1567 asoc->cookie_how[how_indx] = 3; 1568 return (NULL); 1569 } 1570 /* we have already processed the INIT so no problem */ 1571 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, 1572 stcb, net, 1573 SCTP_FROM_SCTP_INPUT + SCTP_LOC_13); 1574 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, 1575 stcb, net, 1576 SCTP_FROM_SCTP_INPUT + SCTP_LOC_14); 1577 /* update current state */ 1578 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) 1579 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1580 else 1581 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1582 1583 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1584 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1585 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1586 stcb->sctp_ep, stcb, asoc->primary_destination); 1587 } 1588 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1589 sctp_stop_all_cookie_timers(stcb); 1590 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1591 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1592 (inp->sctp_socket->so_qlimit == 0) 1593 ) { 1594#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1595 struct socket *so; 1596 1597#endif 1598 /* 1599 * Here is where collision would go if we 1600 * did a connect() and instead got a 1601 * init/init-ack/cookie done before the 1602 * init-ack came back.. 1603 */ 1604 stcb->sctp_ep->sctp_flags |= 1605 SCTP_PCB_FLAGS_CONNECTED; 1606#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1607 so = SCTP_INP_SO(stcb->sctp_ep); 1608 atomic_add_int(&stcb->asoc.refcnt, 1); 1609 SCTP_TCB_UNLOCK(stcb); 1610 SCTP_SOCKET_LOCK(so, 1); 1611 SCTP_TCB_LOCK(stcb); 1612 atomic_add_int(&stcb->asoc.refcnt, -1); 1613 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1614 SCTP_SOCKET_UNLOCK(so, 1); 1615 return (NULL); 1616 } 1617#endif 1618 soisconnected(stcb->sctp_socket); 1619#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1620 SCTP_SOCKET_UNLOCK(so, 1); 1621#endif 1622 } 1623 /* notify upper layer */ 1624 *notification = SCTP_NOTIFY_ASSOC_UP; 1625 /* 1626 * since we did not send a HB make sure we don't 1627 * double things 1628 */ 1629 net->hb_responded = 1; 1630 net->RTO = sctp_calculate_rto(stcb, asoc, net, 1631 &cookie->time_entered, 1632 sctp_align_unsafe_makecopy, 1633 SCTP_RTT_FROM_NON_DATA); 1634 1635 if (stcb->asoc.sctp_autoclose_ticks && 1636 (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) { 1637 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 1638 inp, stcb, NULL); 1639 } 1640 break; 1641 default: 1642 /* 1643 * we're in the OPEN state (or beyond), so peer must 1644 * have simply lost the COOKIE-ACK 1645 */ 1646 break; 1647 } /* end switch */ 1648 sctp_stop_all_cookie_timers(stcb); 1649 /* 1650 * We ignore the return code here.. not sure if we should 1651 * somehow abort.. but we do have an existing asoc. This 1652 * really should not fail. 1653 */ 1654 if (sctp_load_addresses_from_init(stcb, m, 1655 init_offset + sizeof(struct sctp_init_chunk), 1656 initack_offset, src, dst, init_src)) { 1657 if (how_indx < sizeof(asoc->cookie_how)) 1658 asoc->cookie_how[how_indx] = 4; 1659 return (NULL); 1660 } 1661 /* respond with a COOKIE-ACK */ 1662 sctp_toss_old_cookies(stcb, asoc); 1663 sctp_send_cookie_ack(stcb); 1664 if (how_indx < sizeof(asoc->cookie_how)) 1665 asoc->cookie_how[how_indx] = 5; 1666 return (stcb); 1667 } 1668 if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1669 ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag && 1670 cookie->tie_tag_my_vtag == 0 && 1671 cookie->tie_tag_peer_vtag == 0) { 1672 /* 1673 * case C in Section 5.2.4 Table 2: XMOO silently discard 1674 */ 1675 if (how_indx < sizeof(asoc->cookie_how)) 1676 asoc->cookie_how[how_indx] = 6; 1677 return (NULL); 1678 } 1679 /* 1680 * If nat support, and the below and stcb is established, send back 1681 * a ABORT(colliding state) if we are established. 1682 */ 1683 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) && 1684 (asoc->peer_supports_nat) && 1685 ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1686 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1687 (asoc->peer_vtag == 0)))) { 1688 /* 1689 * Special case - Peer's support nat. We may have two init's 1690 * that we gave out the same tag on since one was not 1691 * established.. i.e. we get INIT from host-1 behind the nat 1692 * and we respond tag-a, we get a INIT from host-2 behind 1693 * the nat and we get tag-a again. Then we bring up host-1 1694 * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1). 1695 * Now we have colliding state. We must send an abort here 1696 * with colliding state indication. 1697 */ 1698 op_err = sctp_generate_cause(SCTP_CAUSE_NAT_COLLIDING_STATE, ""); 1699 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err, 1700 mflowtype, mflowid, inp->fibnum, 1701 vrf_id, port); 1702 return (NULL); 1703 } 1704 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1705 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1706 (asoc->peer_vtag == 0))) { 1707 /* 1708 * case B in Section 5.2.4 Table 2: MXAA or MOAA my info 1709 * should be ok, re-accept peer info 1710 */ 1711 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1712 /* 1713 * Extension of case C. If we hit this, then the 1714 * random number generator returned the same vtag 1715 * when we first sent our INIT-ACK and when we later 1716 * sent our INIT. The side with the seq numbers that 1717 * are different will be the one that normnally 1718 * would have hit case C. This in effect "extends" 1719 * our vtags in this collision case to be 64 bits. 1720 * The same collision could occur aka you get both 1721 * vtag and seq number the same twice in a row.. but 1722 * is much less likely. If it did happen then we 1723 * would proceed through and bring up the assoc.. we 1724 * may end up with the wrong stream setup however.. 1725 * which would be bad.. but there is no way to 1726 * tell.. until we send on a stream that does not 1727 * exist :-) 1728 */ 1729 if (how_indx < sizeof(asoc->cookie_how)) 1730 asoc->cookie_how[how_indx] = 7; 1731 1732 return (NULL); 1733 } 1734 if (how_indx < sizeof(asoc->cookie_how)) 1735 asoc->cookie_how[how_indx] = 8; 1736 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, 1737 SCTP_FROM_SCTP_INPUT + SCTP_LOC_15); 1738 sctp_stop_all_cookie_timers(stcb); 1739 /* 1740 * since we did not send a HB make sure we don't double 1741 * things 1742 */ 1743 net->hb_responded = 1; 1744 if (stcb->asoc.sctp_autoclose_ticks && 1745 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 1746 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, 1747 NULL); 1748 } 1749 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1750 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 1751 1752 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) { 1753 /* 1754 * Ok the peer probably discarded our data (if we 1755 * echoed a cookie+data). So anything on the 1756 * sent_queue should be marked for retransmit, we 1757 * may not get something to kick us so it COULD 1758 * still take a timeout to move these.. but it can't 1759 * hurt to mark them. 1760 */ 1761 struct sctp_tmit_chunk *chk; 1762 1763 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 1764 if (chk->sent < SCTP_DATAGRAM_RESEND) { 1765 chk->sent = SCTP_DATAGRAM_RESEND; 1766 sctp_flight_size_decrease(chk); 1767 sctp_total_flight_decrease(stcb, chk); 1768 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 1769 spec_flag++; 1770 } 1771 } 1772 1773 } 1774 /* process the INIT info (peer's info) */ 1775 retval = sctp_process_init(init_cp, stcb); 1776 if (retval < 0) { 1777 if (how_indx < sizeof(asoc->cookie_how)) 1778 asoc->cookie_how[how_indx] = 9; 1779 return (NULL); 1780 } 1781 if (sctp_load_addresses_from_init(stcb, m, 1782 init_offset + sizeof(struct sctp_init_chunk), 1783 initack_offset, src, dst, init_src)) { 1784 if (how_indx < sizeof(asoc->cookie_how)) 1785 asoc->cookie_how[how_indx] = 10; 1786 return (NULL); 1787 } 1788 if ((asoc->state & SCTP_STATE_COOKIE_WAIT) || 1789 (asoc->state & SCTP_STATE_COOKIE_ECHOED)) { 1790 *notification = SCTP_NOTIFY_ASSOC_UP; 1791 1792 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1793 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1794 (inp->sctp_socket->so_qlimit == 0)) { 1795#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1796 struct socket *so; 1797 1798#endif 1799 stcb->sctp_ep->sctp_flags |= 1800 SCTP_PCB_FLAGS_CONNECTED; 1801#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1802 so = SCTP_INP_SO(stcb->sctp_ep); 1803 atomic_add_int(&stcb->asoc.refcnt, 1); 1804 SCTP_TCB_UNLOCK(stcb); 1805 SCTP_SOCKET_LOCK(so, 1); 1806 SCTP_TCB_LOCK(stcb); 1807 atomic_add_int(&stcb->asoc.refcnt, -1); 1808 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1809 SCTP_SOCKET_UNLOCK(so, 1); 1810 return (NULL); 1811 } 1812#endif 1813 soisconnected(stcb->sctp_socket); 1814#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1815 SCTP_SOCKET_UNLOCK(so, 1); 1816#endif 1817 } 1818 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) 1819 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1820 else 1821 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1822 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1823 } else if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) { 1824 SCTP_STAT_INCR_COUNTER32(sctps_restartestab); 1825 } else { 1826 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1827 } 1828 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1829 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1830 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1831 stcb->sctp_ep, stcb, asoc->primary_destination); 1832 } 1833 sctp_stop_all_cookie_timers(stcb); 1834 sctp_toss_old_cookies(stcb, asoc); 1835 sctp_send_cookie_ack(stcb); 1836 if (spec_flag) { 1837 /* 1838 * only if we have retrans set do we do this. What 1839 * this call does is get only the COOKIE-ACK out and 1840 * then when we return the normal call to 1841 * sctp_chunk_output will get the retrans out behind 1842 * this. 1843 */ 1844 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED); 1845 } 1846 if (how_indx < sizeof(asoc->cookie_how)) 1847 asoc->cookie_how[how_indx] = 11; 1848 1849 return (stcb); 1850 } 1851 if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1852 ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) && 1853 cookie->tie_tag_my_vtag == asoc->my_vtag_nonce && 1854 cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce && 1855 cookie->tie_tag_peer_vtag != 0) { 1856 struct sctpasochead *head; 1857 1858#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1859 struct socket *so; 1860 1861#endif 1862 1863 if (asoc->peer_supports_nat) { 1864 /* 1865 * This is a gross gross hack. Just call the 1866 * cookie_new code since we are allowing a duplicate 1867 * association. I hope this works... 1868 */ 1869 return (sctp_process_cookie_new(m, iphlen, offset, src, dst, 1870 sh, cookie, cookie_len, 1871 inp, netp, init_src, notification, 1872 auth_skipped, auth_offset, auth_len, 1873 mflowtype, mflowid, 1874 vrf_id, port)); 1875 } 1876 /* 1877 * case A in Section 5.2.4 Table 2: XXMM (peer restarted) 1878 */ 1879 /* temp code */ 1880 if (how_indx < sizeof(asoc->cookie_how)) 1881 asoc->cookie_how[how_indx] = 12; 1882 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, 1883 SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 1884 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, 1885 SCTP_FROM_SCTP_INPUT + SCTP_LOC_17); 1886 1887 /* notify upper layer */ 1888 *notification = SCTP_NOTIFY_ASSOC_RESTART; 1889 atomic_add_int(&stcb->asoc.refcnt, 1); 1890 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_OPEN) && 1891 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) && 1892 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) { 1893 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1894 } 1895 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) { 1896 SCTP_STAT_INCR_GAUGE32(sctps_restartestab); 1897 } else if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) { 1898 SCTP_STAT_INCR_GAUGE32(sctps_collisionestab); 1899 } 1900 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1901 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1902 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1903 stcb->sctp_ep, stcb, asoc->primary_destination); 1904 1905 } else if (!(asoc->state & SCTP_STATE_SHUTDOWN_SENT)) { 1906 /* move to OPEN state, if not in SHUTDOWN_SENT */ 1907 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1908 } 1909 asoc->pre_open_streams = 1910 ntohs(initack_cp->init.num_outbound_streams); 1911 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 1912 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 1913 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 1914 1915 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 1916 1917 asoc->str_reset_seq_in = asoc->init_seq_number; 1918 1919 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 1920 if (asoc->mapping_array) { 1921 memset(asoc->mapping_array, 0, 1922 asoc->mapping_array_size); 1923 } 1924 if (asoc->nr_mapping_array) { 1925 memset(asoc->nr_mapping_array, 0, 1926 asoc->mapping_array_size); 1927 } 1928 SCTP_TCB_UNLOCK(stcb); 1929#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1930 so = SCTP_INP_SO(stcb->sctp_ep); 1931 SCTP_SOCKET_LOCK(so, 1); 1932#endif 1933 SCTP_INP_INFO_WLOCK(); 1934 SCTP_INP_WLOCK(stcb->sctp_ep); 1935 SCTP_TCB_LOCK(stcb); 1936 atomic_add_int(&stcb->asoc.refcnt, -1); 1937 /* send up all the data */ 1938 SCTP_TCB_SEND_LOCK(stcb); 1939 1940 sctp_report_all_outbound(stcb, 0, 1, SCTP_SO_LOCKED); 1941 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 1942 stcb->asoc.strmout[i].chunks_on_queues = 0; 1943#if defined(SCTP_DETAILED_STR_STATS) 1944 for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) { 1945 asoc->strmout[i].abandoned_sent[j] = 0; 1946 asoc->strmout[i].abandoned_unsent[j] = 0; 1947 } 1948#else 1949 asoc->strmout[i].abandoned_sent[0] = 0; 1950 asoc->strmout[i].abandoned_unsent[0] = 0; 1951#endif 1952 stcb->asoc.strmout[i].stream_no = i; 1953 stcb->asoc.strmout[i].next_sequence_send = 0; 1954 stcb->asoc.strmout[i].last_msg_incomplete = 0; 1955 } 1956 /* process the INIT-ACK info (my info) */ 1957 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 1958 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1959 1960 /* pull from vtag hash */ 1961 LIST_REMOVE(stcb, sctp_asocs); 1962 /* re-insert to new vtag position */ 1963 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, 1964 SCTP_BASE_INFO(hashasocmark))]; 1965 /* 1966 * put it in the bucket in the vtag hash of assoc's for the 1967 * system 1968 */ 1969 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 1970 1971 SCTP_TCB_SEND_UNLOCK(stcb); 1972 SCTP_INP_WUNLOCK(stcb->sctp_ep); 1973 SCTP_INP_INFO_WUNLOCK(); 1974#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1975 SCTP_SOCKET_UNLOCK(so, 1); 1976#endif 1977 asoc->total_flight = 0; 1978 asoc->total_flight_count = 0; 1979 /* process the INIT info (peer's info) */ 1980 retval = sctp_process_init(init_cp, stcb); 1981 if (retval < 0) { 1982 if (how_indx < sizeof(asoc->cookie_how)) 1983 asoc->cookie_how[how_indx] = 13; 1984 1985 return (NULL); 1986 } 1987 /* 1988 * since we did not send a HB make sure we don't double 1989 * things 1990 */ 1991 net->hb_responded = 1; 1992 1993 if (sctp_load_addresses_from_init(stcb, m, 1994 init_offset + sizeof(struct sctp_init_chunk), 1995 initack_offset, src, dst, init_src)) { 1996 if (how_indx < sizeof(asoc->cookie_how)) 1997 asoc->cookie_how[how_indx] = 14; 1998 1999 return (NULL); 2000 } 2001 /* respond with a COOKIE-ACK */ 2002 sctp_stop_all_cookie_timers(stcb); 2003 sctp_toss_old_cookies(stcb, asoc); 2004 sctp_send_cookie_ack(stcb); 2005 if (how_indx < sizeof(asoc->cookie_how)) 2006 asoc->cookie_how[how_indx] = 15; 2007 2008 return (stcb); 2009 } 2010 if (how_indx < sizeof(asoc->cookie_how)) 2011 asoc->cookie_how[how_indx] = 16; 2012 /* all other cases... */ 2013 return (NULL); 2014} 2015 2016 2017/* 2018 * handle a state cookie for a new association m: input packet mbuf chain-- 2019 * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf 2020 * and the cookie signature does not exist offset: offset into mbuf to the 2021 * cookie-echo chunk length: length of the cookie chunk to: where the init 2022 * was from returns a new TCB 2023 */ 2024static struct sctp_tcb * 2025sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 2026 struct sockaddr *src, struct sockaddr *dst, 2027 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 2028 struct sctp_inpcb *inp, struct sctp_nets **netp, 2029 struct sockaddr *init_src, int *notification, 2030 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2031 uint8_t mflowtype, uint32_t mflowid, 2032 uint32_t vrf_id, uint16_t port) 2033{ 2034 struct sctp_tcb *stcb; 2035 struct sctp_init_chunk *init_cp, init_buf; 2036 struct sctp_init_ack_chunk *initack_cp, initack_buf; 2037 union sctp_sockstore store; 2038 struct sctp_association *asoc; 2039 int init_offset, initack_offset, initack_limit; 2040 int retval; 2041 int error = 0; 2042 uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE]; 2043 2044#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2045 struct socket *so; 2046 2047 so = SCTP_INP_SO(inp); 2048#endif 2049 2050 /* 2051 * find and validate the INIT chunk in the cookie (peer's info) the 2052 * INIT should start after the cookie-echo header struct (chunk 2053 * header, state cookie header struct) 2054 */ 2055 init_offset = offset + sizeof(struct sctp_cookie_echo_chunk); 2056 init_cp = (struct sctp_init_chunk *) 2057 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 2058 (uint8_t *) & init_buf); 2059 if (init_cp == NULL) { 2060 /* could not pull a INIT chunk in cookie */ 2061 SCTPDBG(SCTP_DEBUG_INPUT1, 2062 "process_cookie_new: could not pull INIT chunk hdr\n"); 2063 return (NULL); 2064 } 2065 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 2066 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n"); 2067 return (NULL); 2068 } 2069 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 2070 /* 2071 * find and validate the INIT-ACK chunk in the cookie (my info) the 2072 * INIT-ACK follows the INIT chunk 2073 */ 2074 initack_cp = (struct sctp_init_ack_chunk *) 2075 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 2076 (uint8_t *) & initack_buf); 2077 if (initack_cp == NULL) { 2078 /* could not pull INIT-ACK chunk in cookie */ 2079 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n"); 2080 return (NULL); 2081 } 2082 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 2083 return (NULL); 2084 } 2085 /* 2086 * NOTE: We can't use the INIT_ACK's chk_length to determine the 2087 * "initack_limit" value. This is because the chk_length field 2088 * includes the length of the cookie, but the cookie is omitted when 2089 * the INIT and INIT_ACK are tacked onto the cookie... 2090 */ 2091 initack_limit = offset + cookie_len; 2092 2093 /* 2094 * now that we know the INIT/INIT-ACK are in place, create a new TCB 2095 * and popluate 2096 */ 2097 2098 /* 2099 * Here we do a trick, we set in NULL for the proc/thread argument. 2100 * We do this since in effect we only use the p argument when the 2101 * socket is unbound and we must do an implicit bind. Since we are 2102 * getting a cookie, we cannot be unbound. 2103 */ 2104 stcb = sctp_aloc_assoc(inp, init_src, &error, 2105 ntohl(initack_cp->init.initiate_tag), vrf_id, 2106 (struct thread *)NULL 2107 ); 2108 if (stcb == NULL) { 2109 struct mbuf *op_err; 2110 2111 /* memory problem? */ 2112 SCTPDBG(SCTP_DEBUG_INPUT1, 2113 "process_cookie_new: no room for another TCB!\n"); 2114 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2115 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2116 src, dst, sh, op_err, 2117 mflowtype, mflowid, 2118 vrf_id, port); 2119 return (NULL); 2120 } 2121 /* get the correct sctp_nets */ 2122 if (netp) 2123 *netp = sctp_findnet(stcb, init_src); 2124 2125 asoc = &stcb->asoc; 2126 /* get scope variables out of cookie */ 2127 asoc->scope.ipv4_local_scope = cookie->ipv4_scope; 2128 asoc->scope.site_scope = cookie->site_scope; 2129 asoc->scope.local_scope = cookie->local_scope; 2130 asoc->scope.loopback_scope = cookie->loopback_scope; 2131 2132 if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) || 2133 (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) { 2134 struct mbuf *op_err; 2135 2136 /* 2137 * Houston we have a problem. The EP changed while the 2138 * cookie was in flight. Only recourse is to abort the 2139 * association. 2140 */ 2141 atomic_add_int(&stcb->asoc.refcnt, 1); 2142 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2143 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2144 src, dst, sh, op_err, 2145 mflowtype, mflowid, 2146 vrf_id, port); 2147#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2148 SCTP_TCB_UNLOCK(stcb); 2149 SCTP_SOCKET_LOCK(so, 1); 2150 SCTP_TCB_LOCK(stcb); 2151#endif 2152 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2153 SCTP_FROM_SCTP_INPUT + SCTP_LOC_18); 2154#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2155 SCTP_SOCKET_UNLOCK(so, 1); 2156#endif 2157 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2158 return (NULL); 2159 } 2160 /* process the INIT-ACK info (my info) */ 2161 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 2162 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 2163 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 2164 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 2165 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 2166 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 2167 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 2168 asoc->str_reset_seq_in = asoc->init_seq_number; 2169 2170 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 2171 2172 /* process the INIT info (peer's info) */ 2173 if (netp) 2174 retval = sctp_process_init(init_cp, stcb); 2175 else 2176 retval = 0; 2177 if (retval < 0) { 2178 atomic_add_int(&stcb->asoc.refcnt, 1); 2179#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2180 SCTP_TCB_UNLOCK(stcb); 2181 SCTP_SOCKET_LOCK(so, 1); 2182 SCTP_TCB_LOCK(stcb); 2183#endif 2184 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2185 SCTP_FROM_SCTP_INPUT + SCTP_LOC_19); 2186#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2187 SCTP_SOCKET_UNLOCK(so, 1); 2188#endif 2189 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2190 return (NULL); 2191 } 2192 /* load all addresses */ 2193 if (sctp_load_addresses_from_init(stcb, m, 2194 init_offset + sizeof(struct sctp_init_chunk), initack_offset, 2195 src, dst, init_src)) { 2196 atomic_add_int(&stcb->asoc.refcnt, 1); 2197#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2198 SCTP_TCB_UNLOCK(stcb); 2199 SCTP_SOCKET_LOCK(so, 1); 2200 SCTP_TCB_LOCK(stcb); 2201#endif 2202 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2203 SCTP_FROM_SCTP_INPUT + SCTP_LOC_20); 2204#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2205 SCTP_SOCKET_UNLOCK(so, 1); 2206#endif 2207 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2208 return (NULL); 2209 } 2210 /* 2211 * verify any preceding AUTH chunk that was skipped 2212 */ 2213 /* pull the local authentication parameters from the cookie/init-ack */ 2214 sctp_auth_get_cookie_params(stcb, m, 2215 initack_offset + sizeof(struct sctp_init_ack_chunk), 2216 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk))); 2217 if (auth_skipped) { 2218 struct sctp_auth_chunk *auth; 2219 2220 auth = (struct sctp_auth_chunk *) 2221 sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf); 2222 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) { 2223 /* auth HMAC failed, dump the assoc and packet */ 2224 SCTPDBG(SCTP_DEBUG_AUTH1, 2225 "COOKIE-ECHO: AUTH failed\n"); 2226 atomic_add_int(&stcb->asoc.refcnt, 1); 2227#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2228 SCTP_TCB_UNLOCK(stcb); 2229 SCTP_SOCKET_LOCK(so, 1); 2230 SCTP_TCB_LOCK(stcb); 2231#endif 2232 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2233 SCTP_FROM_SCTP_INPUT + SCTP_LOC_21); 2234#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2235 SCTP_SOCKET_UNLOCK(so, 1); 2236#endif 2237 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2238 return (NULL); 2239 } else { 2240 /* remaining chunks checked... good to go */ 2241 stcb->asoc.authenticated = 1; 2242 } 2243 } 2244 /* update current state */ 2245 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2246 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 2247 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2248 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2249 stcb->sctp_ep, stcb, asoc->primary_destination); 2250 } 2251 sctp_stop_all_cookie_timers(stcb); 2252 SCTP_STAT_INCR_COUNTER32(sctps_passiveestab); 2253 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2254 2255 /* 2256 * if we're doing ASCONFs, check to see if we have any new local 2257 * addresses that need to get added to the peer (eg. addresses 2258 * changed while cookie echo in flight). This needs to be done 2259 * after we go to the OPEN state to do the correct asconf 2260 * processing. else, make sure we have the correct addresses in our 2261 * lists 2262 */ 2263 2264 /* warning, we re-use sin, sin6, sa_store here! */ 2265 /* pull in local_address (our "from" address) */ 2266 switch (cookie->laddr_type) { 2267#ifdef INET 2268 case SCTP_IPV4_ADDRESS: 2269 /* source addr is IPv4 */ 2270 memset(&store.sin, 0, sizeof(struct sockaddr_in)); 2271 store.sin.sin_family = AF_INET; 2272 store.sin.sin_len = sizeof(struct sockaddr_in); 2273 store.sin.sin_addr.s_addr = cookie->laddress[0]; 2274 break; 2275#endif 2276#ifdef INET6 2277 case SCTP_IPV6_ADDRESS: 2278 /* source addr is IPv6 */ 2279 memset(&store.sin6, 0, sizeof(struct sockaddr_in6)); 2280 store.sin6.sin6_family = AF_INET6; 2281 store.sin6.sin6_len = sizeof(struct sockaddr_in6); 2282 store.sin6.sin6_scope_id = cookie->scope_id; 2283 memcpy(&store.sin6.sin6_addr, cookie->laddress, sizeof(struct in6_addr)); 2284 break; 2285#endif 2286 default: 2287 atomic_add_int(&stcb->asoc.refcnt, 1); 2288#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2289 SCTP_TCB_UNLOCK(stcb); 2290 SCTP_SOCKET_LOCK(so, 1); 2291 SCTP_TCB_LOCK(stcb); 2292#endif 2293 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2294 SCTP_FROM_SCTP_INPUT + SCTP_LOC_22); 2295#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2296 SCTP_SOCKET_UNLOCK(so, 1); 2297#endif 2298 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2299 return (NULL); 2300 } 2301 2302 /* set up to notify upper layer */ 2303 *notification = SCTP_NOTIFY_ASSOC_UP; 2304 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2305 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 2306 (inp->sctp_socket->so_qlimit == 0)) { 2307 /* 2308 * This is an endpoint that called connect() how it got a 2309 * cookie that is NEW is a bit of a mystery. It must be that 2310 * the INIT was sent, but before it got there.. a complete 2311 * INIT/INIT-ACK/COOKIE arrived. But of course then it 2312 * should have went to the other code.. not here.. oh well.. 2313 * a bit of protection is worth having.. 2314 */ 2315 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2316#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2317 atomic_add_int(&stcb->asoc.refcnt, 1); 2318 SCTP_TCB_UNLOCK(stcb); 2319 SCTP_SOCKET_LOCK(so, 1); 2320 SCTP_TCB_LOCK(stcb); 2321 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2322 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2323 SCTP_SOCKET_UNLOCK(so, 1); 2324 return (NULL); 2325 } 2326#endif 2327 soisconnected(stcb->sctp_socket); 2328#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2329 SCTP_SOCKET_UNLOCK(so, 1); 2330#endif 2331 } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 2332 (inp->sctp_socket->so_qlimit)) { 2333 /* 2334 * We don't want to do anything with this one. Since it is 2335 * the listening guy. The timer will get started for 2336 * accepted connections in the caller. 2337 */ 2338 ; 2339 } 2340 /* since we did not send a HB make sure we don't double things */ 2341 if ((netp) && (*netp)) 2342 (*netp)->hb_responded = 1; 2343 2344 if (stcb->asoc.sctp_autoclose_ticks && 2345 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2346 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL); 2347 } 2348 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 2349 if ((netp != NULL) && (*netp != NULL)) { 2350 /* calculate the RTT and set the encaps port */ 2351 (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp, 2352 &cookie->time_entered, sctp_align_unsafe_makecopy, 2353 SCTP_RTT_FROM_NON_DATA); 2354#if defined(INET) || defined(INET6) 2355 if (((*netp)->port == 0) && (port != 0)) { 2356 sctp_pathmtu_adjustment(stcb, (*netp)->mtu - sizeof(struct udphdr)); 2357 } 2358 (*netp)->port = port; 2359#endif 2360 } 2361 /* respond with a COOKIE-ACK */ 2362 sctp_send_cookie_ack(stcb); 2363 2364 /* 2365 * check the address lists for any ASCONFs that need to be sent 2366 * AFTER the cookie-ack is sent 2367 */ 2368 sctp_check_address_list(stcb, m, 2369 initack_offset + sizeof(struct sctp_init_ack_chunk), 2370 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)), 2371 &store.sa, cookie->local_scope, cookie->site_scope, 2372 cookie->ipv4_scope, cookie->loopback_scope); 2373 2374 2375 return (stcb); 2376} 2377 2378/* 2379 * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e 2380 * we NEED to make sure we are not already using the vtag. If so we 2381 * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit! 2382 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag, 2383 SCTP_BASE_INFO(hashasocmark))]; 2384 LIST_FOREACH(stcb, head, sctp_asocs) { 2385 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep)) { 2386 -- SEND ABORT - TRY AGAIN -- 2387 } 2388 } 2389*/ 2390 2391/* 2392 * handles a COOKIE-ECHO message stcb: modified to either a new or left as 2393 * existing (non-NULL) TCB 2394 */ 2395static struct mbuf * 2396sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset, 2397 struct sockaddr *src, struct sockaddr *dst, 2398 struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp, 2399 struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp, 2400 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2401 struct sctp_tcb **locked_tcb, 2402 uint8_t mflowtype, uint32_t mflowid, 2403 uint32_t vrf_id, uint16_t port) 2404{ 2405 struct sctp_state_cookie *cookie; 2406 struct sctp_tcb *l_stcb = *stcb; 2407 struct sctp_inpcb *l_inp; 2408 struct sockaddr *to; 2409 struct sctp_pcb *ep; 2410 struct mbuf *m_sig; 2411 uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE]; 2412 uint8_t *sig; 2413 uint8_t cookie_ok = 0; 2414 unsigned int sig_offset, cookie_offset; 2415 unsigned int cookie_len; 2416 struct timeval now; 2417 struct timeval time_expires; 2418 int notification = 0; 2419 struct sctp_nets *netl; 2420 int had_a_existing_tcb = 0; 2421 int send_int_conf = 0; 2422 2423#ifdef INET 2424 struct sockaddr_in sin; 2425 2426#endif 2427#ifdef INET6 2428 struct sockaddr_in6 sin6; 2429 2430#endif 2431 2432 SCTPDBG(SCTP_DEBUG_INPUT2, 2433 "sctp_handle_cookie: handling COOKIE-ECHO\n"); 2434 2435 if (inp_p == NULL) { 2436 return (NULL); 2437 } 2438 cookie = &cp->cookie; 2439 cookie_offset = offset + sizeof(struct sctp_chunkhdr); 2440 cookie_len = ntohs(cp->ch.chunk_length); 2441 2442 if ((cookie->peerport != sh->src_port) || 2443 (cookie->myport != sh->dest_port) || 2444 (cookie->my_vtag != sh->v_tag)) { 2445 /* 2446 * invalid ports or bad tag. Note that we always leave the 2447 * v_tag in the header in network order and when we stored 2448 * it in the my_vtag slot we also left it in network order. 2449 * This maintains the match even though it may be in the 2450 * opposite byte order of the machine :-> 2451 */ 2452 return (NULL); 2453 } 2454 if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) + 2455 sizeof(struct sctp_init_chunk) + 2456 sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) { 2457 /* cookie too small */ 2458 return (NULL); 2459 } 2460 /* 2461 * split off the signature into its own mbuf (since it should not be 2462 * calculated in the sctp_hmac_m() call). 2463 */ 2464 sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE; 2465 m_sig = m_split(m, sig_offset, M_NOWAIT); 2466 if (m_sig == NULL) { 2467 /* out of memory or ?? */ 2468 return (NULL); 2469 } 2470#ifdef SCTP_MBUF_LOGGING 2471 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 2472 sctp_log_mbc(m_sig, SCTP_MBUF_SPLIT); 2473 } 2474#endif 2475 2476 /* 2477 * compute the signature/digest for the cookie 2478 */ 2479 ep = &(*inp_p)->sctp_ep; 2480 l_inp = *inp_p; 2481 if (l_stcb) { 2482 SCTP_TCB_UNLOCK(l_stcb); 2483 } 2484 SCTP_INP_RLOCK(l_inp); 2485 if (l_stcb) { 2486 SCTP_TCB_LOCK(l_stcb); 2487 } 2488 /* which cookie is it? */ 2489 if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) && 2490 (ep->current_secret_number != ep->last_secret_number)) { 2491 /* it's the old cookie */ 2492 (void)sctp_hmac_m(SCTP_HMAC, 2493 (uint8_t *) ep->secret_key[(int)ep->last_secret_number], 2494 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2495 } else { 2496 /* it's the current cookie */ 2497 (void)sctp_hmac_m(SCTP_HMAC, 2498 (uint8_t *) ep->secret_key[(int)ep->current_secret_number], 2499 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2500 } 2501 /* get the signature */ 2502 SCTP_INP_RUNLOCK(l_inp); 2503 sig = (uint8_t *) sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *) & tmp_sig); 2504 if (sig == NULL) { 2505 /* couldn't find signature */ 2506 sctp_m_freem(m_sig); 2507 return (NULL); 2508 } 2509 /* compare the received digest with the computed digest */ 2510 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) { 2511 /* try the old cookie? */ 2512 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) && 2513 (ep->current_secret_number != ep->last_secret_number)) { 2514 /* compute digest with old */ 2515 (void)sctp_hmac_m(SCTP_HMAC, 2516 (uint8_t *) ep->secret_key[(int)ep->last_secret_number], 2517 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2518 /* compare */ 2519 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0) 2520 cookie_ok = 1; 2521 } 2522 } else { 2523 cookie_ok = 1; 2524 } 2525 2526 /* 2527 * Now before we continue we must reconstruct our mbuf so that 2528 * normal processing of any other chunks will work. 2529 */ 2530 { 2531 struct mbuf *m_at; 2532 2533 m_at = m; 2534 while (SCTP_BUF_NEXT(m_at) != NULL) { 2535 m_at = SCTP_BUF_NEXT(m_at); 2536 } 2537 SCTP_BUF_NEXT(m_at) = m_sig; 2538 } 2539 2540 if (cookie_ok == 0) { 2541 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n"); 2542 SCTPDBG(SCTP_DEBUG_INPUT2, 2543 "offset = %u, cookie_offset = %u, sig_offset = %u\n", 2544 (uint32_t) offset, cookie_offset, sig_offset); 2545 return (NULL); 2546 } 2547 /* 2548 * check the cookie timestamps to be sure it's not stale 2549 */ 2550 (void)SCTP_GETTIME_TIMEVAL(&now); 2551 /* Expire time is in Ticks, so we convert to seconds */ 2552 time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life); 2553 time_expires.tv_usec = cookie->time_entered.tv_usec; 2554 /* 2555 * TODO sctp_constants.h needs alternative time macros when _KERNEL 2556 * is undefined. 2557 */ 2558 if (timevalcmp(&now, &time_expires, >)) { 2559 /* cookie is stale! */ 2560 struct mbuf *op_err; 2561 struct sctp_error_stale_cookie *cause; 2562 uint32_t tim; 2563 2564 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_error_stale_cookie), 2565 0, M_NOWAIT, 1, MT_DATA); 2566 if (op_err == NULL) { 2567 /* FOOBAR */ 2568 return (NULL); 2569 } 2570 /* Set the len */ 2571 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_error_stale_cookie); 2572 cause = mtod(op_err, struct sctp_error_stale_cookie *); 2573 cause->cause.code = htons(SCTP_CAUSE_STALE_COOKIE); 2574 cause->cause.length = htons((sizeof(struct sctp_paramhdr) + 2575 (sizeof(uint32_t)))); 2576 /* seconds to usec */ 2577 tim = (now.tv_sec - time_expires.tv_sec) * 1000000; 2578 /* add in usec */ 2579 if (tim == 0) 2580 tim = now.tv_usec - cookie->time_entered.tv_usec; 2581 cause->stale_time = htonl(tim); 2582 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 2583 mflowtype, mflowid, l_inp->fibnum, 2584 vrf_id, port); 2585 return (NULL); 2586 } 2587 /* 2588 * Now we must see with the lookup address if we have an existing 2589 * asoc. This will only happen if we were in the COOKIE-WAIT state 2590 * and a INIT collided with us and somewhere the peer sent the 2591 * cookie on another address besides the single address our assoc 2592 * had for him. In this case we will have one of the tie-tags set at 2593 * least AND the address field in the cookie can be used to look it 2594 * up. 2595 */ 2596 to = NULL; 2597 switch (cookie->addr_type) { 2598#ifdef INET6 2599 case SCTP_IPV6_ADDRESS: 2600 memset(&sin6, 0, sizeof(sin6)); 2601 sin6.sin6_family = AF_INET6; 2602 sin6.sin6_len = sizeof(sin6); 2603 sin6.sin6_port = sh->src_port; 2604 sin6.sin6_scope_id = cookie->scope_id; 2605 memcpy(&sin6.sin6_addr.s6_addr, cookie->address, 2606 sizeof(sin6.sin6_addr.s6_addr)); 2607 to = (struct sockaddr *)&sin6; 2608 break; 2609#endif 2610#ifdef INET 2611 case SCTP_IPV4_ADDRESS: 2612 memset(&sin, 0, sizeof(sin)); 2613 sin.sin_family = AF_INET; 2614 sin.sin_len = sizeof(sin); 2615 sin.sin_port = sh->src_port; 2616 sin.sin_addr.s_addr = cookie->address[0]; 2617 to = (struct sockaddr *)&sin; 2618 break; 2619#endif 2620 default: 2621 /* This should not happen */ 2622 return (NULL); 2623 } 2624 if (*stcb == NULL) { 2625 /* Yep, lets check */ 2626 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL); 2627 if (*stcb == NULL) { 2628 /* 2629 * We should have only got back the same inp. If we 2630 * got back a different ep we have a problem. The 2631 * original findep got back l_inp and now 2632 */ 2633 if (l_inp != *inp_p) { 2634 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n"); 2635 } 2636 } else { 2637 if (*locked_tcb == NULL) { 2638 /* 2639 * In this case we found the assoc only 2640 * after we locked the create lock. This 2641 * means we are in a colliding case and we 2642 * must make sure that we unlock the tcb if 2643 * its one of the cases where we throw away 2644 * the incoming packets. 2645 */ 2646 *locked_tcb = *stcb; 2647 2648 /* 2649 * We must also increment the inp ref count 2650 * since the ref_count flags was set when we 2651 * did not find the TCB, now we found it 2652 * which reduces the refcount.. we must 2653 * raise it back out to balance it all :-) 2654 */ 2655 SCTP_INP_INCR_REF((*stcb)->sctp_ep); 2656 if ((*stcb)->sctp_ep != l_inp) { 2657 SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n", 2658 (void *)(*stcb)->sctp_ep, (void *)l_inp); 2659 } 2660 } 2661 } 2662 } 2663 cookie_len -= SCTP_SIGNATURE_SIZE; 2664 if (*stcb == NULL) { 2665 /* this is the "normal" case... get a new TCB */ 2666 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh, 2667 cookie, cookie_len, *inp_p, 2668 netp, to, ¬ification, 2669 auth_skipped, auth_offset, auth_len, 2670 mflowtype, mflowid, 2671 vrf_id, port); 2672 } else { 2673 /* this is abnormal... cookie-echo on existing TCB */ 2674 had_a_existing_tcb = 1; 2675 *stcb = sctp_process_cookie_existing(m, iphlen, offset, 2676 src, dst, sh, 2677 cookie, cookie_len, *inp_p, *stcb, netp, to, 2678 ¬ification, auth_skipped, auth_offset, auth_len, 2679 mflowtype, mflowid, 2680 vrf_id, port); 2681 } 2682 2683 if (*stcb == NULL) { 2684 /* still no TCB... must be bad cookie-echo */ 2685 return (NULL); 2686 } 2687 if (*netp != NULL) { 2688 (*netp)->flowtype = mflowtype; 2689 (*netp)->flowid = mflowid; 2690 } 2691 /* 2692 * Ok, we built an association so confirm the address we sent the 2693 * INIT-ACK to. 2694 */ 2695 netl = sctp_findnet(*stcb, to); 2696 /* 2697 * This code should in theory NOT run but 2698 */ 2699 if (netl == NULL) { 2700 /* TSNH! Huh, why do I need to add this address here? */ 2701 if (sctp_add_remote_addr(*stcb, to, NULL, SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) { 2702 return (NULL); 2703 } 2704 netl = sctp_findnet(*stcb, to); 2705 } 2706 if (netl) { 2707 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) { 2708 netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 2709 (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL, 2710 netl); 2711 send_int_conf = 1; 2712 } 2713 } 2714 sctp_start_net_timers(*stcb); 2715 if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) { 2716 if (!had_a_existing_tcb || 2717 (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) { 2718 /* 2719 * If we have a NEW cookie or the connect never 2720 * reached the connected state during collision we 2721 * must do the TCP accept thing. 2722 */ 2723 struct socket *so, *oso; 2724 struct sctp_inpcb *inp; 2725 2726 if (notification == SCTP_NOTIFY_ASSOC_RESTART) { 2727 /* 2728 * For a restart we will keep the same 2729 * socket, no need to do anything. I THINK!! 2730 */ 2731 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2732 if (send_int_conf) { 2733 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2734 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2735 } 2736 return (m); 2737 } 2738 oso = (*inp_p)->sctp_socket; 2739 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2740 SCTP_TCB_UNLOCK((*stcb)); 2741 CURVNET_SET(oso->so_vnet); 2742 so = sonewconn(oso, 0 2743 ); 2744 CURVNET_RESTORE(); 2745 SCTP_TCB_LOCK((*stcb)); 2746 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2747 2748 if (so == NULL) { 2749 struct mbuf *op_err; 2750 2751#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2752 struct socket *pcb_so; 2753 2754#endif 2755 /* Too many sockets */ 2756 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n"); 2757 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2758 sctp_abort_association(*inp_p, NULL, m, iphlen, 2759 src, dst, sh, op_err, 2760 mflowtype, mflowid, 2761 vrf_id, port); 2762#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2763 pcb_so = SCTP_INP_SO(*inp_p); 2764 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2765 SCTP_TCB_UNLOCK((*stcb)); 2766 SCTP_SOCKET_LOCK(pcb_so, 1); 2767 SCTP_TCB_LOCK((*stcb)); 2768 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2769#endif 2770 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, 2771 SCTP_FROM_SCTP_INPUT + SCTP_LOC_23); 2772#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2773 SCTP_SOCKET_UNLOCK(pcb_so, 1); 2774#endif 2775 return (NULL); 2776 } 2777 inp = (struct sctp_inpcb *)so->so_pcb; 2778 SCTP_INP_INCR_REF(inp); 2779 /* 2780 * We add the unbound flag here so that if we get an 2781 * soabort() before we get the move_pcb done, we 2782 * will properly cleanup. 2783 */ 2784 inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE | 2785 SCTP_PCB_FLAGS_CONNECTED | 2786 SCTP_PCB_FLAGS_IN_TCPPOOL | 2787 SCTP_PCB_FLAGS_UNBOUND | 2788 (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) | 2789 SCTP_PCB_FLAGS_DONT_WAKE); 2790 inp->sctp_features = (*inp_p)->sctp_features; 2791 inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features; 2792 inp->sctp_socket = so; 2793 inp->sctp_frag_point = (*inp_p)->sctp_frag_point; 2794 inp->max_cwnd = (*inp_p)->max_cwnd; 2795 inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off; 2796 inp->ecn_supported = (*inp_p)->ecn_supported; 2797 inp->prsctp_supported = (*inp_p)->prsctp_supported; 2798 inp->auth_supported = (*inp_p)->auth_supported; 2799 inp->asconf_supported = (*inp_p)->asconf_supported; 2800 inp->reconfig_supported = (*inp_p)->reconfig_supported; 2801 inp->nrsack_supported = (*inp_p)->nrsack_supported; 2802 inp->pktdrop_supported = (*inp_p)->pktdrop_supported; 2803 inp->partial_delivery_point = (*inp_p)->partial_delivery_point; 2804 inp->sctp_context = (*inp_p)->sctp_context; 2805 inp->local_strreset_support = (*inp_p)->local_strreset_support; 2806 inp->fibnum = (*inp_p)->fibnum; 2807 inp->inp_starting_point_for_iterator = NULL; 2808 /* 2809 * copy in the authentication parameters from the 2810 * original endpoint 2811 */ 2812 if (inp->sctp_ep.local_hmacs) 2813 sctp_free_hmaclist(inp->sctp_ep.local_hmacs); 2814 inp->sctp_ep.local_hmacs = 2815 sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs); 2816 if (inp->sctp_ep.local_auth_chunks) 2817 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks); 2818 inp->sctp_ep.local_auth_chunks = 2819 sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks); 2820 2821 /* 2822 * Now we must move it from one hash table to 2823 * another and get the tcb in the right place. 2824 */ 2825 2826 /* 2827 * This is where the one-2-one socket is put into 2828 * the accept state waiting for the accept! 2829 */ 2830 if (*stcb) { 2831 (*stcb)->asoc.state |= SCTP_STATE_IN_ACCEPT_QUEUE; 2832 } 2833 sctp_move_pcb_and_assoc(*inp_p, inp, *stcb); 2834 2835 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2836 SCTP_TCB_UNLOCK((*stcb)); 2837 2838 sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb, 2839 0); 2840 SCTP_TCB_LOCK((*stcb)); 2841 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2842 2843 2844 /* 2845 * now we must check to see if we were aborted while 2846 * the move was going on and the lock/unlock 2847 * happened. 2848 */ 2849 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 2850 /* 2851 * yep it was, we leave the assoc attached 2852 * to the socket since the sctp_inpcb_free() 2853 * call will send an abort for us. 2854 */ 2855 SCTP_INP_DECR_REF(inp); 2856 return (NULL); 2857 } 2858 SCTP_INP_DECR_REF(inp); 2859 /* Switch over to the new guy */ 2860 *inp_p = inp; 2861 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2862 if (send_int_conf) { 2863 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2864 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2865 } 2866 /* 2867 * Pull it from the incomplete queue and wake the 2868 * guy 2869 */ 2870#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2871 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2872 SCTP_TCB_UNLOCK((*stcb)); 2873 SCTP_SOCKET_LOCK(so, 1); 2874#endif 2875 soisconnected(so); 2876#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2877 SCTP_TCB_LOCK((*stcb)); 2878 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2879 SCTP_SOCKET_UNLOCK(so, 1); 2880#endif 2881 return (m); 2882 } 2883 } 2884 if (notification) { 2885 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2886 } 2887 if (send_int_conf) { 2888 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2889 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2890 } 2891 return (m); 2892} 2893 2894static void 2895sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED, 2896 struct sctp_tcb *stcb, struct sctp_nets *net) 2897{ 2898 /* cp must not be used, others call this without a c-ack :-) */ 2899 struct sctp_association *asoc; 2900 2901 SCTPDBG(SCTP_DEBUG_INPUT2, 2902 "sctp_handle_cookie_ack: handling COOKIE-ACK\n"); 2903 if ((stcb == NULL) || (net == NULL)) { 2904 return; 2905 } 2906 asoc = &stcb->asoc; 2907 2908 sctp_stop_all_cookie_timers(stcb); 2909 /* process according to association state */ 2910 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) { 2911 /* state change only needed when I am in right state */ 2912 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2913 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 2914 sctp_start_net_timers(stcb); 2915 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2916 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2917 stcb->sctp_ep, stcb, asoc->primary_destination); 2918 2919 } 2920 /* update RTO */ 2921 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 2922 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2923 if (asoc->overall_error_count == 0) { 2924 net->RTO = sctp_calculate_rto(stcb, asoc, net, 2925 &asoc->time_entered, sctp_align_safe_nocopy, 2926 SCTP_RTT_FROM_NON_DATA); 2927 } 2928 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 2929 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2930 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2931 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 2932#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2933 struct socket *so; 2934 2935#endif 2936 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2937#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2938 so = SCTP_INP_SO(stcb->sctp_ep); 2939 atomic_add_int(&stcb->asoc.refcnt, 1); 2940 SCTP_TCB_UNLOCK(stcb); 2941 SCTP_SOCKET_LOCK(so, 1); 2942 SCTP_TCB_LOCK(stcb); 2943 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2944#endif 2945 if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) { 2946 soisconnected(stcb->sctp_socket); 2947 } 2948#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2949 SCTP_SOCKET_UNLOCK(so, 1); 2950#endif 2951 } 2952 /* 2953 * since we did not send a HB make sure we don't double 2954 * things 2955 */ 2956 net->hb_responded = 1; 2957 2958 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2959 /* 2960 * We don't need to do the asconf thing, nor hb or 2961 * autoclose if the socket is closed. 2962 */ 2963 goto closed_socket; 2964 } 2965 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 2966 stcb, net); 2967 2968 2969 if (stcb->asoc.sctp_autoclose_ticks && 2970 sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2971 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 2972 stcb->sctp_ep, stcb, NULL); 2973 } 2974 /* 2975 * send ASCONF if parameters are pending and ASCONFs are 2976 * allowed (eg. addresses changed when init/cookie echo were 2977 * in flight) 2978 */ 2979 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) && 2980 (stcb->asoc.asconf_supported == 1) && 2981 (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) { 2982#ifdef SCTP_TIMER_BASED_ASCONF 2983 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, 2984 stcb->sctp_ep, stcb, 2985 stcb->asoc.primary_destination); 2986#else 2987 sctp_send_asconf(stcb, stcb->asoc.primary_destination, 2988 SCTP_ADDR_NOT_LOCKED); 2989#endif 2990 } 2991 } 2992closed_socket: 2993 /* Toss the cookie if I can */ 2994 sctp_toss_old_cookies(stcb, asoc); 2995 if (!TAILQ_EMPTY(&asoc->sent_queue)) { 2996 /* Restart the timer if we have pending data */ 2997 struct sctp_tmit_chunk *chk; 2998 2999 chk = TAILQ_FIRST(&asoc->sent_queue); 3000 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 3001 } 3002} 3003 3004static void 3005sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp, 3006 struct sctp_tcb *stcb) 3007{ 3008 struct sctp_nets *net; 3009 struct sctp_tmit_chunk *lchk; 3010 struct sctp_ecne_chunk bkup; 3011 uint8_t override_bit; 3012 uint32_t tsn, window_data_tsn; 3013 int len; 3014 unsigned int pkt_cnt; 3015 3016 len = ntohs(cp->ch.chunk_length); 3017 if ((len != sizeof(struct sctp_ecne_chunk)) && 3018 (len != sizeof(struct old_sctp_ecne_chunk))) { 3019 return; 3020 } 3021 if (len == sizeof(struct old_sctp_ecne_chunk)) { 3022 /* Its the old format */ 3023 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk)); 3024 bkup.num_pkts_since_cwr = htonl(1); 3025 cp = &bkup; 3026 } 3027 SCTP_STAT_INCR(sctps_recvecne); 3028 tsn = ntohl(cp->tsn); 3029 pkt_cnt = ntohl(cp->num_pkts_since_cwr); 3030 lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead); 3031 if (lchk == NULL) { 3032 window_data_tsn = stcb->asoc.sending_seq - 1; 3033 } else { 3034 window_data_tsn = lchk->rec.data.TSN_seq; 3035 } 3036 3037 /* Find where it was sent to if possible. */ 3038 net = NULL; 3039 TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) { 3040 if (lchk->rec.data.TSN_seq == tsn) { 3041 net = lchk->whoTo; 3042 net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send; 3043 break; 3044 } 3045 if (SCTP_TSN_GT(lchk->rec.data.TSN_seq, tsn)) { 3046 break; 3047 } 3048 } 3049 if (net == NULL) { 3050 /* 3051 * What to do. A previous send of a CWR was possibly lost. 3052 * See how old it is, we may have it marked on the actual 3053 * net. 3054 */ 3055 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 3056 if (tsn == net->last_cwr_tsn) { 3057 /* Found him, send it off */ 3058 break; 3059 } 3060 } 3061 if (net == NULL) { 3062 /* 3063 * If we reach here, we need to send a special CWR 3064 * that says hey, we did this a long time ago and 3065 * you lost the response. 3066 */ 3067 net = TAILQ_FIRST(&stcb->asoc.nets); 3068 if (net == NULL) { 3069 /* TSNH */ 3070 return; 3071 } 3072 override_bit = SCTP_CWR_REDUCE_OVERRIDE; 3073 } else { 3074 override_bit = 0; 3075 } 3076 } else { 3077 override_bit = 0; 3078 } 3079 if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) && 3080 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 3081 /* 3082 * JRS - Use the congestion control given in the pluggable 3083 * CC module 3084 */ 3085 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt); 3086 /* 3087 * We reduce once every RTT. So we will only lower cwnd at 3088 * the next sending seq i.e. the window_data_tsn 3089 */ 3090 net->cwr_window_tsn = window_data_tsn; 3091 net->ecn_ce_pkt_cnt += pkt_cnt; 3092 net->lost_cnt = pkt_cnt; 3093 net->last_cwr_tsn = tsn; 3094 } else { 3095 override_bit |= SCTP_CWR_IN_SAME_WINDOW; 3096 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) && 3097 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 3098 /* 3099 * Another loss in the same window update how many 3100 * marks/packets lost we have had. 3101 */ 3102 int cnt = 1; 3103 3104 if (pkt_cnt > net->lost_cnt) { 3105 /* Should be the case */ 3106 cnt = (pkt_cnt - net->lost_cnt); 3107 net->ecn_ce_pkt_cnt += cnt; 3108 } 3109 net->lost_cnt = pkt_cnt; 3110 net->last_cwr_tsn = tsn; 3111 /* 3112 * Most CC functions will ignore this call, since we 3113 * are in-window yet of the initial CE the peer saw. 3114 */ 3115 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt); 3116 } 3117 } 3118 /* 3119 * We always send a CWR this way if our previous one was lost our 3120 * peer will get an update, or if it is not time again to reduce we 3121 * still get the cwr to the peer. Note we set the override when we 3122 * could not find the TSN on the chunk or the destination network. 3123 */ 3124 sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit); 3125} 3126 3127static void 3128sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net) 3129{ 3130 /* 3131 * Here we get a CWR from the peer. We must look in the outqueue and 3132 * make sure that we have a covered ECNE in the control chunk part. 3133 * If so remove it. 3134 */ 3135 struct sctp_tmit_chunk *chk; 3136 struct sctp_ecne_chunk *ecne; 3137 int override; 3138 uint32_t cwr_tsn; 3139 3140 cwr_tsn = ntohl(cp->tsn); 3141 override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE; 3142 TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) { 3143 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) { 3144 continue; 3145 } 3146 if ((override == 0) && (chk->whoTo != net)) { 3147 /* Must be from the right src unless override is set */ 3148 continue; 3149 } 3150 ecne = mtod(chk->data, struct sctp_ecne_chunk *); 3151 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) { 3152 /* this covers this ECNE, we can remove it */ 3153 stcb->asoc.ecn_echo_cnt_onq--; 3154 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, 3155 sctp_next); 3156 sctp_m_freem(chk->data); 3157 chk->data = NULL; 3158 stcb->asoc.ctrl_queue_cnt--; 3159 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3160 if (override == 0) { 3161 break; 3162 } 3163 } 3164 } 3165} 3166 3167static void 3168sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED, 3169 struct sctp_tcb *stcb, struct sctp_nets *net) 3170{ 3171 struct sctp_association *asoc; 3172 3173#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3174 struct socket *so; 3175 3176#endif 3177 3178 SCTPDBG(SCTP_DEBUG_INPUT2, 3179 "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n"); 3180 if (stcb == NULL) 3181 return; 3182 3183 asoc = &stcb->asoc; 3184 /* process according to association state */ 3185 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 3186 /* unexpected SHUTDOWN-COMPLETE... so ignore... */ 3187 SCTPDBG(SCTP_DEBUG_INPUT2, 3188 "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n"); 3189 SCTP_TCB_UNLOCK(stcb); 3190 return; 3191 } 3192 /* notify upper layer protocol */ 3193 if (stcb->sctp_socket) { 3194 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 3195 } 3196#ifdef INVARIANTS 3197 if (!TAILQ_EMPTY(&asoc->send_queue) || 3198 !TAILQ_EMPTY(&asoc->sent_queue) || 3199 !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 3200 panic("Queues are not empty when handling SHUTDOWN-COMPLETE"); 3201 } 3202#endif 3203 /* stop the timer */ 3204 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, 3205 SCTP_FROM_SCTP_INPUT + SCTP_LOC_24); 3206 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 3207 /* free the TCB */ 3208 SCTPDBG(SCTP_DEBUG_INPUT2, 3209 "sctp_handle_shutdown_complete: calls free-asoc\n"); 3210#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3211 so = SCTP_INP_SO(stcb->sctp_ep); 3212 atomic_add_int(&stcb->asoc.refcnt, 1); 3213 SCTP_TCB_UNLOCK(stcb); 3214 SCTP_SOCKET_LOCK(so, 1); 3215 SCTP_TCB_LOCK(stcb); 3216 atomic_subtract_int(&stcb->asoc.refcnt, 1); 3217#endif 3218 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 3219 SCTP_FROM_SCTP_INPUT + SCTP_LOC_25); 3220#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3221 SCTP_SOCKET_UNLOCK(so, 1); 3222#endif 3223 return; 3224} 3225 3226static int 3227process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc, 3228 struct sctp_nets *net, uint8_t flg) 3229{ 3230 switch (desc->chunk_type) { 3231 case SCTP_DATA: 3232 /* find the tsn to resend (possibly */ 3233 { 3234 uint32_t tsn; 3235 struct sctp_tmit_chunk *tp1; 3236 3237 tsn = ntohl(desc->tsn_ifany); 3238 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3239 if (tp1->rec.data.TSN_seq == tsn) { 3240 /* found it */ 3241 break; 3242 } 3243 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, tsn)) { 3244 /* not found */ 3245 tp1 = NULL; 3246 break; 3247 } 3248 } 3249 if (tp1 == NULL) { 3250 /* 3251 * Do it the other way , aka without paying 3252 * attention to queue seq order. 3253 */ 3254 SCTP_STAT_INCR(sctps_pdrpdnfnd); 3255 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3256 if (tp1->rec.data.TSN_seq == tsn) { 3257 /* found it */ 3258 break; 3259 } 3260 } 3261 } 3262 if (tp1 == NULL) { 3263 SCTP_STAT_INCR(sctps_pdrptsnnf); 3264 } 3265 if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) { 3266 uint8_t *ddp; 3267 3268 if (((flg & SCTP_BADCRC) == 0) && 3269 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3270 return (0); 3271 } 3272 if ((stcb->asoc.peers_rwnd == 0) && 3273 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3274 SCTP_STAT_INCR(sctps_pdrpdiwnp); 3275 return (0); 3276 } 3277 if (stcb->asoc.peers_rwnd == 0 && 3278 (flg & SCTP_FROM_MIDDLE_BOX)) { 3279 SCTP_STAT_INCR(sctps_pdrpdizrw); 3280 return (0); 3281 } 3282 ddp = (uint8_t *) (mtod(tp1->data, caddr_t)+ 3283 sizeof(struct sctp_data_chunk)); 3284 { 3285 unsigned int iii; 3286 3287 for (iii = 0; iii < sizeof(desc->data_bytes); 3288 iii++) { 3289 if (ddp[iii] != desc->data_bytes[iii]) { 3290 SCTP_STAT_INCR(sctps_pdrpbadd); 3291 return (-1); 3292 } 3293 } 3294 } 3295 3296 if (tp1->do_rtt) { 3297 /* 3298 * this guy had a RTO calculation 3299 * pending on it, cancel it 3300 */ 3301 if (tp1->whoTo->rto_needed == 0) { 3302 tp1->whoTo->rto_needed = 1; 3303 } 3304 tp1->do_rtt = 0; 3305 } 3306 SCTP_STAT_INCR(sctps_pdrpmark); 3307 if (tp1->sent != SCTP_DATAGRAM_RESEND) 3308 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3309 /* 3310 * mark it as if we were doing a FR, since 3311 * we will be getting gap ack reports behind 3312 * the info from the router. 3313 */ 3314 tp1->rec.data.doing_fast_retransmit = 1; 3315 /* 3316 * mark the tsn with what sequences can 3317 * cause a new FR. 3318 */ 3319 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) { 3320 tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq; 3321 } else { 3322 tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq; 3323 } 3324 3325 /* restart the timer */ 3326 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3327 stcb, tp1->whoTo, 3328 SCTP_FROM_SCTP_INPUT + SCTP_LOC_26); 3329 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3330 stcb, tp1->whoTo); 3331 3332 /* fix counts and things */ 3333 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 3334 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP, 3335 tp1->whoTo->flight_size, 3336 tp1->book_size, 3337 (uintptr_t) stcb, 3338 tp1->rec.data.TSN_seq); 3339 } 3340 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3341 sctp_flight_size_decrease(tp1); 3342 sctp_total_flight_decrease(stcb, tp1); 3343 } 3344 tp1->sent = SCTP_DATAGRAM_RESEND; 3345 } { 3346 /* audit code */ 3347 unsigned int audit; 3348 3349 audit = 0; 3350 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3351 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3352 audit++; 3353 } 3354 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue, 3355 sctp_next) { 3356 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3357 audit++; 3358 } 3359 if (audit != stcb->asoc.sent_queue_retran_cnt) { 3360 SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n", 3361 audit, stcb->asoc.sent_queue_retran_cnt); 3362#ifndef SCTP_AUDITING_ENABLED 3363 stcb->asoc.sent_queue_retran_cnt = audit; 3364#endif 3365 } 3366 } 3367 } 3368 break; 3369 case SCTP_ASCONF: 3370 { 3371 struct sctp_tmit_chunk *asconf; 3372 3373 TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue, 3374 sctp_next) { 3375 if (asconf->rec.chunk_id.id == SCTP_ASCONF) { 3376 break; 3377 } 3378 } 3379 if (asconf) { 3380 if (asconf->sent != SCTP_DATAGRAM_RESEND) 3381 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3382 asconf->sent = SCTP_DATAGRAM_RESEND; 3383 asconf->snd_count--; 3384 } 3385 } 3386 break; 3387 case SCTP_INITIATION: 3388 /* resend the INIT */ 3389 stcb->asoc.dropped_special_cnt++; 3390 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) { 3391 /* 3392 * If we can get it in, in a few attempts we do 3393 * this, otherwise we let the timer fire. 3394 */ 3395 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, 3396 stcb, net, 3397 SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 3398 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 3399 } 3400 break; 3401 case SCTP_SELECTIVE_ACK: 3402 case SCTP_NR_SELECTIVE_ACK: 3403 /* resend the sack */ 3404 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED); 3405 break; 3406 case SCTP_HEARTBEAT_REQUEST: 3407 /* resend a demand HB */ 3408 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) { 3409 /* 3410 * Only retransmit if we KNOW we wont destroy the 3411 * tcb 3412 */ 3413 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 3414 } 3415 break; 3416 case SCTP_SHUTDOWN: 3417 sctp_send_shutdown(stcb, net); 3418 break; 3419 case SCTP_SHUTDOWN_ACK: 3420 sctp_send_shutdown_ack(stcb, net); 3421 break; 3422 case SCTP_COOKIE_ECHO: 3423 { 3424 struct sctp_tmit_chunk *cookie; 3425 3426 cookie = NULL; 3427 TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, 3428 sctp_next) { 3429 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) { 3430 break; 3431 } 3432 } 3433 if (cookie) { 3434 if (cookie->sent != SCTP_DATAGRAM_RESEND) 3435 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3436 cookie->sent = SCTP_DATAGRAM_RESEND; 3437 sctp_stop_all_cookie_timers(stcb); 3438 } 3439 } 3440 break; 3441 case SCTP_COOKIE_ACK: 3442 sctp_send_cookie_ack(stcb); 3443 break; 3444 case SCTP_ASCONF_ACK: 3445 /* resend last asconf ack */ 3446 sctp_send_asconf_ack(stcb); 3447 break; 3448 case SCTP_FORWARD_CUM_TSN: 3449 send_forward_tsn(stcb, &stcb->asoc); 3450 break; 3451 /* can't do anything with these */ 3452 case SCTP_PACKET_DROPPED: 3453 case SCTP_INITIATION_ACK: /* this should not happen */ 3454 case SCTP_HEARTBEAT_ACK: 3455 case SCTP_ABORT_ASSOCIATION: 3456 case SCTP_OPERATION_ERROR: 3457 case SCTP_SHUTDOWN_COMPLETE: 3458 case SCTP_ECN_ECHO: 3459 case SCTP_ECN_CWR: 3460 default: 3461 break; 3462 } 3463 return (0); 3464} 3465 3466void 3467sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list) 3468{ 3469 uint32_t i; 3470 uint16_t temp; 3471 3472 /* 3473 * We set things to 0xffff since this is the last delivered sequence 3474 * and we will be sending in 0 after the reset. 3475 */ 3476 3477 if (number_entries) { 3478 for (i = 0; i < number_entries; i++) { 3479 temp = ntohs(list[i]); 3480 if (temp >= stcb->asoc.streamincnt) { 3481 continue; 3482 } 3483 stcb->asoc.strmin[temp].last_sequence_delivered = 0xffff; 3484 } 3485 } else { 3486 list = NULL; 3487 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3488 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff; 3489 } 3490 } 3491 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3492} 3493 3494static void 3495sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list) 3496{ 3497 uint32_t i; 3498 uint16_t temp; 3499 3500 if (number_entries > 0) { 3501 for (i = 0; i < number_entries; i++) { 3502 temp = ntohs(list[i]); 3503 if (temp >= stcb->asoc.streamoutcnt) { 3504 /* no such stream */ 3505 continue; 3506 } 3507 stcb->asoc.strmout[temp].next_sequence_send = 0; 3508 } 3509 } else { 3510 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3511 stcb->asoc.strmout[i].next_sequence_send = 0; 3512 } 3513 } 3514 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3515} 3516 3517static void 3518sctp_reset_clear_pending(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list) 3519{ 3520 uint32_t i; 3521 uint16_t temp; 3522 3523 if (number_entries > 0) { 3524 for (i = 0; i < number_entries; i++) { 3525 temp = ntohs(list[i]); 3526 if (temp >= stcb->asoc.streamoutcnt) { 3527 /* no such stream */ 3528 continue; 3529 } 3530 stcb->asoc.strmout[temp].state = SCTP_STREAM_OPEN; 3531 } 3532 } else { 3533 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3534 stcb->asoc.strmout[i].state = SCTP_STREAM_OPEN; 3535 } 3536 } 3537} 3538 3539 3540struct sctp_stream_reset_request * 3541sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk) 3542{ 3543 struct sctp_association *asoc; 3544 struct sctp_chunkhdr *ch; 3545 struct sctp_stream_reset_request *r; 3546 struct sctp_tmit_chunk *chk; 3547 int len, clen; 3548 3549 asoc = &stcb->asoc; 3550 if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 3551 asoc->stream_reset_outstanding = 0; 3552 return (NULL); 3553 } 3554 if (stcb->asoc.str_reset == NULL) { 3555 asoc->stream_reset_outstanding = 0; 3556 return (NULL); 3557 } 3558 chk = stcb->asoc.str_reset; 3559 if (chk->data == NULL) { 3560 return (NULL); 3561 } 3562 if (bchk) { 3563 /* he wants a copy of the chk pointer */ 3564 *bchk = chk; 3565 } 3566 clen = chk->send_size; 3567 ch = mtod(chk->data, struct sctp_chunkhdr *); 3568 r = (struct sctp_stream_reset_request *)(ch + 1); 3569 if (ntohl(r->request_seq) == seq) { 3570 /* found it */ 3571 return (r); 3572 } 3573 len = SCTP_SIZE32(ntohs(r->ph.param_length)); 3574 if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) { 3575 /* move to the next one, there can only be a max of two */ 3576 r = (struct sctp_stream_reset_request *)((caddr_t)r + len); 3577 if (ntohl(r->request_seq) == seq) { 3578 return (r); 3579 } 3580 } 3581 /* that seq is not here */ 3582 return (NULL); 3583} 3584 3585static void 3586sctp_clean_up_stream_reset(struct sctp_tcb *stcb) 3587{ 3588 struct sctp_association *asoc; 3589 struct sctp_tmit_chunk *chk = stcb->asoc.str_reset; 3590 3591 if (stcb->asoc.str_reset == NULL) { 3592 return; 3593 } 3594 asoc = &stcb->asoc; 3595 3596 sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, 3597 chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_28); 3598 TAILQ_REMOVE(&asoc->control_send_queue, 3599 chk, 3600 sctp_next); 3601 if (chk->data) { 3602 sctp_m_freem(chk->data); 3603 chk->data = NULL; 3604 } 3605 asoc->ctrl_queue_cnt--; 3606 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3607 /* sa_ignore NO_NULL_CHK */ 3608 stcb->asoc.str_reset = NULL; 3609} 3610 3611 3612static int 3613sctp_handle_stream_reset_response(struct sctp_tcb *stcb, 3614 uint32_t seq, uint32_t action, 3615 struct sctp_stream_reset_response *respin) 3616{ 3617 uint16_t type; 3618 int lparm_len; 3619 struct sctp_association *asoc = &stcb->asoc; 3620 struct sctp_tmit_chunk *chk; 3621 struct sctp_stream_reset_request *req_param; 3622 struct sctp_stream_reset_out_request *req_out_param; 3623 struct sctp_stream_reset_in_request *req_in_param; 3624 uint32_t number_entries; 3625 3626 if (asoc->stream_reset_outstanding == 0) { 3627 /* duplicate */ 3628 return (0); 3629 } 3630 if (seq == stcb->asoc.str_reset_seq_out) { 3631 req_param = sctp_find_stream_reset(stcb, seq, &chk); 3632 if (req_param != NULL) { 3633 stcb->asoc.str_reset_seq_out++; 3634 type = ntohs(req_param->ph.param_type); 3635 lparm_len = ntohs(req_param->ph.param_length); 3636 if (type == SCTP_STR_RESET_OUT_REQUEST) { 3637 int no_clear = 0; 3638 3639 req_out_param = (struct sctp_stream_reset_out_request *)req_param; 3640 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t); 3641 asoc->stream_reset_out_is_outstanding = 0; 3642 if (asoc->stream_reset_outstanding) 3643 asoc->stream_reset_outstanding--; 3644 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3645 /* do it */ 3646 sctp_reset_out_streams(stcb, number_entries, req_out_param->list_of_streams); 3647 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3648 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3649 } else if (action == SCTP_STREAM_RESET_RESULT_IN_PROGRESS) { 3650 /* 3651 * Set it up so we don't stop 3652 * retransmitting 3653 */ 3654 asoc->stream_reset_outstanding++; 3655 stcb->asoc.str_reset_seq_out--; 3656 asoc->stream_reset_out_is_outstanding = 1; 3657 no_clear = 1; 3658 } else { 3659 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3660 } 3661 if (no_clear == 0) { 3662 sctp_reset_clear_pending(stcb, number_entries, req_out_param->list_of_streams); 3663 } 3664 } else if (type == SCTP_STR_RESET_IN_REQUEST) { 3665 req_in_param = (struct sctp_stream_reset_in_request *)req_param; 3666 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t); 3667 if (asoc->stream_reset_outstanding) 3668 asoc->stream_reset_outstanding--; 3669 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3670 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb, 3671 number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3672 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3673 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb, 3674 number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3675 } 3676 } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) { 3677 /* Ok we now may have more streams */ 3678 int num_stream; 3679 3680 num_stream = stcb->asoc.strm_pending_add_size; 3681 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) { 3682 /* TSNH */ 3683 num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt; 3684 } 3685 stcb->asoc.strm_pending_add_size = 0; 3686 if (asoc->stream_reset_outstanding) 3687 asoc->stream_reset_outstanding--; 3688 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3689 /* Put the new streams into effect */ 3690 int i; 3691 3692 for (i = asoc->streamoutcnt; i < (asoc->streamoutcnt + num_stream); i++) { 3693 asoc->strmout[i].state = SCTP_STREAM_OPEN; 3694 } 3695 asoc->streamoutcnt += num_stream; 3696 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 3697 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3698 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3699 SCTP_STREAM_CHANGE_DENIED); 3700 } else { 3701 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3702 SCTP_STREAM_CHANGE_FAILED); 3703 } 3704 } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) { 3705 if (asoc->stream_reset_outstanding) 3706 asoc->stream_reset_outstanding--; 3707 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3708 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3709 SCTP_STREAM_CHANGE_DENIED); 3710 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3711 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3712 SCTP_STREAM_CHANGE_FAILED); 3713 } 3714 } else if (type == SCTP_STR_RESET_TSN_REQUEST) { 3715 /** 3716 * a) Adopt the new in tsn. 3717 * b) reset the map 3718 * c) Adopt the new out-tsn 3719 */ 3720 struct sctp_stream_reset_response_tsn *resp; 3721 struct sctp_forward_tsn_chunk fwdtsn; 3722 int abort_flag = 0; 3723 3724 if (respin == NULL) { 3725 /* huh ? */ 3726 return (0); 3727 } 3728 if (ntohs(respin->ph.param_length) < sizeof(struct sctp_stream_reset_response_tsn)) { 3729 return (0); 3730 } 3731 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3732 resp = (struct sctp_stream_reset_response_tsn *)respin; 3733 asoc->stream_reset_outstanding--; 3734 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3735 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3736 fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1); 3737 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3738 if (abort_flag) { 3739 return (1); 3740 } 3741 stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1); 3742 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3743 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3744 } 3745 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 3746 stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn); 3747 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 3748 3749 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map; 3750 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size); 3751 3752 stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn); 3753 stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn; 3754 3755 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL); 3756 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL); 3757 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0); 3758 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3759 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3760 SCTP_ASSOC_RESET_DENIED); 3761 } else { 3762 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3763 SCTP_ASSOC_RESET_FAILED); 3764 } 3765 } 3766 /* get rid of the request and get the request flags */ 3767 if (asoc->stream_reset_outstanding == 0) { 3768 sctp_clean_up_stream_reset(stcb); 3769 } 3770 } 3771 } 3772 if (asoc->stream_reset_outstanding == 0) { 3773 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED); 3774 } 3775 return (0); 3776} 3777 3778static void 3779sctp_handle_str_reset_request_in(struct sctp_tcb *stcb, 3780 struct sctp_tmit_chunk *chk, 3781 struct sctp_stream_reset_in_request *req, int trunc) 3782{ 3783 uint32_t seq; 3784 int len, i; 3785 int number_entries; 3786 uint16_t temp; 3787 3788 /* 3789 * peer wants me to send a str-reset to him for my outgoing seq's if 3790 * seq_in is right. 3791 */ 3792 struct sctp_association *asoc = &stcb->asoc; 3793 3794 seq = ntohl(req->request_seq); 3795 if (asoc->str_reset_seq_in == seq) { 3796 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3797 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3798 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3799 } else if (trunc) { 3800 /* Can't do it, since they exceeded our buffer size */ 3801 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3802 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) { 3803 len = ntohs(req->ph.param_length); 3804 number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t)); 3805 if (number_entries) { 3806 for (i = 0; i < number_entries; i++) { 3807 temp = ntohs(req->list_of_streams[i]); 3808 if (temp >= stcb->asoc.streamoutcnt) { 3809 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3810 goto bad_boy; 3811 } 3812 req->list_of_streams[i] = temp; 3813 } 3814 for (i = 0; i < number_entries; i++) { 3815 if (stcb->asoc.strmout[req->list_of_streams[i]].state == SCTP_STREAM_OPEN) { 3816 stcb->asoc.strmout[req->list_of_streams[i]].state = SCTP_STREAM_RESET_PENDING; 3817 } 3818 } 3819 } else { 3820 /* Its all */ 3821 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3822 if (stcb->asoc.strmout[i].state == SCTP_STREAM_OPEN) 3823 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_PENDING; 3824 } 3825 } 3826 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3827 } else { 3828 /* Can't do it, since we have sent one out */ 3829 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 3830 } 3831bad_boy: 3832 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3833 asoc->str_reset_seq_in++; 3834 } else if (asoc->str_reset_seq_in - 1 == seq) { 3835 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3836 } else if (asoc->str_reset_seq_in - 2 == seq) { 3837 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3838 } else { 3839 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3840 } 3841 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED); 3842} 3843 3844static int 3845sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb, 3846 struct sctp_tmit_chunk *chk, 3847 struct sctp_stream_reset_tsn_request *req) 3848{ 3849 /* reset all in and out and update the tsn */ 3850 /* 3851 * A) reset my str-seq's on in and out. B) Select a receive next, 3852 * and set cum-ack to it. Also process this selected number as a 3853 * fwd-tsn as well. C) set in the response my next sending seq. 3854 */ 3855 struct sctp_forward_tsn_chunk fwdtsn; 3856 struct sctp_association *asoc = &stcb->asoc; 3857 int abort_flag = 0; 3858 uint32_t seq; 3859 3860 seq = ntohl(req->request_seq); 3861 if (asoc->str_reset_seq_in == seq) { 3862 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3863 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 3864 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3865 } else { 3866 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3867 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3868 fwdtsn.ch.chunk_flags = 0; 3869 fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1); 3870 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3871 if (abort_flag) { 3872 return (1); 3873 } 3874 asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA; 3875 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3876 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3877 } 3878 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map; 3879 asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1; 3880 memset(asoc->mapping_array, 0, asoc->mapping_array_size); 3881 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 3882 memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size); 3883 atomic_add_int(&asoc->sending_seq, 1); 3884 /* save off historical data for retrans */ 3885 asoc->last_sending_seq[1] = asoc->last_sending_seq[0]; 3886 asoc->last_sending_seq[0] = asoc->sending_seq; 3887 asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0]; 3888 asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn; 3889 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL); 3890 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL); 3891 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3892 sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0); 3893 } 3894 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3895 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3896 asoc->str_reset_seq_in++; 3897 } else if (asoc->str_reset_seq_in - 1 == seq) { 3898 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3899 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3900 } else if (asoc->str_reset_seq_in - 2 == seq) { 3901 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1], 3902 asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]); 3903 } else { 3904 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3905 } 3906 return (0); 3907} 3908 3909static void 3910sctp_handle_str_reset_request_out(struct sctp_tcb *stcb, 3911 struct sctp_tmit_chunk *chk, 3912 struct sctp_stream_reset_out_request *req, int trunc) 3913{ 3914 uint32_t seq, tsn; 3915 int number_entries, len; 3916 struct sctp_association *asoc = &stcb->asoc; 3917 3918 seq = ntohl(req->request_seq); 3919 3920 /* now if its not a duplicate we process it */ 3921 if (asoc->str_reset_seq_in == seq) { 3922 len = ntohs(req->ph.param_length); 3923 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t)); 3924 /* 3925 * the sender is resetting, handle the list issue.. we must 3926 * a) verify if we can do the reset, if so no problem b) If 3927 * we can't do the reset we must copy the request. c) queue 3928 * it, and setup the data in processor to trigger it off 3929 * when needed and dequeue all the queued data. 3930 */ 3931 tsn = ntohl(req->send_reset_at_tsn); 3932 3933 /* move the reset action back one */ 3934 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3935 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3936 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3937 } else if (trunc) { 3938 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3939 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) { 3940 /* we can do it now */ 3941 sctp_reset_in_stream(stcb, number_entries, req->list_of_streams); 3942 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3943 } else { 3944 /* 3945 * we must queue it up and thus wait for the TSN's 3946 * to arrive that are at or before tsn 3947 */ 3948 struct sctp_stream_reset_list *liste; 3949 int siz; 3950 3951 siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t)); 3952 SCTP_MALLOC(liste, struct sctp_stream_reset_list *, 3953 siz, SCTP_M_STRESET); 3954 if (liste == NULL) { 3955 /* gak out of memory */ 3956 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3957 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3958 return; 3959 } 3960 liste->seq = seq; 3961 liste->tsn = tsn; 3962 liste->number_entries = number_entries; 3963 memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t)); 3964 TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp); 3965 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_IN_PROGRESS; 3966 } 3967 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3968 asoc->str_reset_seq_in++; 3969 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3970 /* 3971 * one seq back, just echo back last action since my 3972 * response was lost. 3973 */ 3974 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3975 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3976 /* 3977 * two seq back, just echo back last action since my 3978 * response was lost. 3979 */ 3980 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3981 } else { 3982 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3983 } 3984} 3985 3986static void 3987sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 3988 struct sctp_stream_reset_add_strm *str_add) 3989{ 3990 /* 3991 * Peer is requesting to add more streams. If its within our 3992 * max-streams we will allow it. 3993 */ 3994 uint32_t num_stream, i; 3995 uint32_t seq; 3996 struct sctp_association *asoc = &stcb->asoc; 3997 struct sctp_queued_to_read *ctl, *nctl; 3998 3999 /* Get the number. */ 4000 seq = ntohl(str_add->request_seq); 4001 num_stream = ntohs(str_add->number_of_streams); 4002 /* Now what would be the new total? */ 4003 if (asoc->str_reset_seq_in == seq) { 4004 num_stream += stcb->asoc.streamincnt; 4005 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 4006 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 4007 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4008 } else if ((num_stream > stcb->asoc.max_inbound_streams) || 4009 (num_stream > 0xffff)) { 4010 /* We must reject it they ask for to many */ 4011 denied: 4012 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4013 } else { 4014 /* Ok, we can do that :-) */ 4015 struct sctp_stream_in *oldstrm; 4016 4017 /* save off the old */ 4018 oldstrm = stcb->asoc.strmin; 4019 SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *, 4020 (num_stream * sizeof(struct sctp_stream_in)), 4021 SCTP_M_STRMI); 4022 if (stcb->asoc.strmin == NULL) { 4023 stcb->asoc.strmin = oldstrm; 4024 goto denied; 4025 } 4026 /* copy off the old data */ 4027 for (i = 0; i < stcb->asoc.streamincnt; i++) { 4028 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 4029 stcb->asoc.strmin[i].stream_no = i; 4030 stcb->asoc.strmin[i].last_sequence_delivered = oldstrm[i].last_sequence_delivered; 4031 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started; 4032 /* now anything on those queues? */ 4033 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next, nctl) { 4034 TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next); 4035 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next); 4036 } 4037 } 4038 /* Init the new streams */ 4039 for (i = stcb->asoc.streamincnt; i < num_stream; i++) { 4040 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 4041 stcb->asoc.strmin[i].stream_no = i; 4042 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff; 4043 stcb->asoc.strmin[i].delivery_started = 0; 4044 } 4045 SCTP_FREE(oldstrm, SCTP_M_STRMI); 4046 /* update the size */ 4047 stcb->asoc.streamincnt = num_stream; 4048 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 4049 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 4050 } 4051 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4052 asoc->str_reset_seq_in++; 4053 } else if ((asoc->str_reset_seq_in - 1) == seq) { 4054 /* 4055 * one seq back, just echo back last action since my 4056 * response was lost. 4057 */ 4058 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4059 } else if ((asoc->str_reset_seq_in - 2) == seq) { 4060 /* 4061 * two seq back, just echo back last action since my 4062 * response was lost. 4063 */ 4064 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 4065 } else { 4066 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 4067 4068 } 4069} 4070 4071static void 4072sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 4073 struct sctp_stream_reset_add_strm *str_add) 4074{ 4075 /* 4076 * Peer is requesting to add more streams. If its within our 4077 * max-streams we will allow it. 4078 */ 4079 uint16_t num_stream; 4080 uint32_t seq; 4081 struct sctp_association *asoc = &stcb->asoc; 4082 4083 /* Get the number. */ 4084 seq = ntohl(str_add->request_seq); 4085 num_stream = ntohs(str_add->number_of_streams); 4086 /* Now what would be the new total? */ 4087 if (asoc->str_reset_seq_in == seq) { 4088 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 4089 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 4090 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4091 } else if (stcb->asoc.stream_reset_outstanding) { 4092 /* We must reject it we have something pending */ 4093 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 4094 } else { 4095 /* Ok, we can do that :-) */ 4096 int mychk; 4097 4098 mychk = stcb->asoc.streamoutcnt; 4099 mychk += num_stream; 4100 if (mychk < 0x10000) { 4101 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 4102 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 1, num_stream, 0, 1)) { 4103 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4104 } 4105 } else { 4106 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4107 } 4108 } 4109 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]); 4110 asoc->str_reset_seq_in++; 4111 } else if ((asoc->str_reset_seq_in - 1) == seq) { 4112 /* 4113 * one seq back, just echo back last action since my 4114 * response was lost. 4115 */ 4116 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4117 } else if ((asoc->str_reset_seq_in - 2) == seq) { 4118 /* 4119 * two seq back, just echo back last action since my 4120 * response was lost. 4121 */ 4122 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 4123 } else { 4124 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 4125 } 4126} 4127 4128#ifdef __GNUC__ 4129__attribute__((noinline)) 4130#endif 4131 static int 4132 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset, 4133 struct sctp_chunkhdr *ch_req) 4134{ 4135 uint16_t remaining_length, param_len, ptype; 4136 struct sctp_paramhdr pstore; 4137 uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE]; 4138 uint32_t seq = 0; 4139 int num_req = 0; 4140 int trunc = 0; 4141 struct sctp_tmit_chunk *chk; 4142 struct sctp_chunkhdr *ch; 4143 struct sctp_paramhdr *ph; 4144 int ret_code = 0; 4145 int num_param = 0; 4146 4147 /* now it may be a reset or a reset-response */ 4148 remaining_length = ntohs(ch_req->chunk_length) - sizeof(struct sctp_chunkhdr); 4149 4150 /* setup for adding the response */ 4151 sctp_alloc_a_chunk(stcb, chk); 4152 if (chk == NULL) { 4153 return (ret_code); 4154 } 4155 chk->copy_by_ref = 0; 4156 chk->rec.chunk_id.id = SCTP_STREAM_RESET; 4157 chk->rec.chunk_id.can_take_data = 0; 4158 chk->flags = 0; 4159 chk->asoc = &stcb->asoc; 4160 chk->no_fr_allowed = 0; 4161 chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr); 4162 chk->book_size_scale = 0; 4163 chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA); 4164 if (chk->data == NULL) { 4165strres_nochunk: 4166 if (chk->data) { 4167 sctp_m_freem(chk->data); 4168 chk->data = NULL; 4169 } 4170 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 4171 return (ret_code); 4172 } 4173 SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD); 4174 4175 /* setup chunk parameters */ 4176 chk->sent = SCTP_DATAGRAM_UNSENT; 4177 chk->snd_count = 0; 4178 chk->whoTo = NULL; 4179 4180 ch = mtod(chk->data, struct sctp_chunkhdr *); 4181 ch->chunk_type = SCTP_STREAM_RESET; 4182 ch->chunk_flags = 0; 4183 ch->chunk_length = htons(chk->send_size); 4184 SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size); 4185 offset += sizeof(struct sctp_chunkhdr); 4186 while (remaining_length >= sizeof(struct sctp_paramhdr)) { 4187 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *) & pstore); 4188 if (ph == NULL) { 4189 /* TSNH */ 4190 break; 4191 } 4192 param_len = ntohs(ph->param_length); 4193 if ((param_len > remaining_length) || 4194 (param_len < (sizeof(struct sctp_paramhdr) + sizeof(uint32_t)))) { 4195 /* bad parameter length */ 4196 break; 4197 } 4198 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, sizeof(cstore)), 4199 (uint8_t *) & cstore); 4200 if (ph == NULL) { 4201 /* TSNH */ 4202 break; 4203 } 4204 ptype = ntohs(ph->param_type); 4205 num_param++; 4206 if (param_len > sizeof(cstore)) { 4207 trunc = 1; 4208 } else { 4209 trunc = 0; 4210 } 4211 if (num_param > SCTP_MAX_RESET_PARAMS) { 4212 /* hit the max of parameters already sorry.. */ 4213 break; 4214 } 4215 if (ptype == SCTP_STR_RESET_OUT_REQUEST) { 4216 struct sctp_stream_reset_out_request *req_out; 4217 4218 if (param_len < sizeof(struct sctp_stream_reset_out_request)) { 4219 break; 4220 } 4221 req_out = (struct sctp_stream_reset_out_request *)ph; 4222 num_req++; 4223 if (stcb->asoc.stream_reset_outstanding) { 4224 seq = ntohl(req_out->response_seq); 4225 if (seq == stcb->asoc.str_reset_seq_out) { 4226 /* implicit ack */ 4227 (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL); 4228 } 4229 } 4230 sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc); 4231 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) { 4232 struct sctp_stream_reset_add_strm *str_add; 4233 4234 if (param_len < sizeof(struct sctp_stream_reset_add_strm)) { 4235 break; 4236 } 4237 str_add = (struct sctp_stream_reset_add_strm *)ph; 4238 num_req++; 4239 sctp_handle_str_reset_add_strm(stcb, chk, str_add); 4240 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) { 4241 struct sctp_stream_reset_add_strm *str_add; 4242 4243 if (param_len < sizeof(struct sctp_stream_reset_add_strm)) { 4244 break; 4245 } 4246 str_add = (struct sctp_stream_reset_add_strm *)ph; 4247 num_req++; 4248 sctp_handle_str_reset_add_out_strm(stcb, chk, str_add); 4249 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) { 4250 struct sctp_stream_reset_in_request *req_in; 4251 4252 num_req++; 4253 req_in = (struct sctp_stream_reset_in_request *)ph; 4254 sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc); 4255 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) { 4256 struct sctp_stream_reset_tsn_request *req_tsn; 4257 4258 num_req++; 4259 req_tsn = (struct sctp_stream_reset_tsn_request *)ph; 4260 if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) { 4261 ret_code = 1; 4262 goto strres_nochunk; 4263 } 4264 /* no more */ 4265 break; 4266 } else if (ptype == SCTP_STR_RESET_RESPONSE) { 4267 struct sctp_stream_reset_response *resp; 4268 uint32_t result; 4269 4270 if (param_len < sizeof(struct sctp_stream_reset_response)) { 4271 break; 4272 } 4273 resp = (struct sctp_stream_reset_response *)ph; 4274 seq = ntohl(resp->response_seq); 4275 result = ntohl(resp->result); 4276 if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) { 4277 ret_code = 1; 4278 goto strres_nochunk; 4279 } 4280 } else { 4281 break; 4282 } 4283 offset += SCTP_SIZE32(param_len); 4284 if (remaining_length >= SCTP_SIZE32(param_len)) { 4285 remaining_length -= SCTP_SIZE32(param_len); 4286 } else { 4287 remaining_length = 0; 4288 } 4289 } 4290 if (num_req == 0) { 4291 /* we have no response free the stuff */ 4292 goto strres_nochunk; 4293 } 4294 /* ok we have a chunk to link in */ 4295 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, 4296 chk, 4297 sctp_next); 4298 stcb->asoc.ctrl_queue_cnt++; 4299 return (ret_code); 4300} 4301 4302/* 4303 * Handle a router or endpoints report of a packet loss, there are two ways 4304 * to handle this, either we get the whole packet and must disect it 4305 * ourselves (possibly with truncation and or corruption) or it is a summary 4306 * from a middle box that did the disectting for us. 4307 */ 4308static void 4309sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp, 4310 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 4311{ 4312 uint32_t bottle_bw, on_queue; 4313 uint16_t trunc_len; 4314 unsigned int chlen; 4315 unsigned int at; 4316 struct sctp_chunk_desc desc; 4317 struct sctp_chunkhdr *ch; 4318 4319 chlen = ntohs(cp->ch.chunk_length); 4320 chlen -= sizeof(struct sctp_pktdrop_chunk); 4321 /* XXX possible chlen underflow */ 4322 if (chlen == 0) { 4323 ch = NULL; 4324 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) 4325 SCTP_STAT_INCR(sctps_pdrpbwrpt); 4326 } else { 4327 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr)); 4328 chlen -= sizeof(struct sctphdr); 4329 /* XXX possible chlen underflow */ 4330 memset(&desc, 0, sizeof(desc)); 4331 } 4332 trunc_len = (uint16_t) ntohs(cp->trunc_len); 4333 if (trunc_len > limit) { 4334 trunc_len = limit; 4335 } 4336 /* now the chunks themselves */ 4337 while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) { 4338 desc.chunk_type = ch->chunk_type; 4339 /* get amount we need to move */ 4340 at = ntohs(ch->chunk_length); 4341 if (at < sizeof(struct sctp_chunkhdr)) { 4342 /* corrupt chunk, maybe at the end? */ 4343 SCTP_STAT_INCR(sctps_pdrpcrupt); 4344 break; 4345 } 4346 if (trunc_len == 0) { 4347 /* we are supposed to have all of it */ 4348 if (at > chlen) { 4349 /* corrupt skip it */ 4350 SCTP_STAT_INCR(sctps_pdrpcrupt); 4351 break; 4352 } 4353 } else { 4354 /* is there enough of it left ? */ 4355 if (desc.chunk_type == SCTP_DATA) { 4356 if (chlen < (sizeof(struct sctp_data_chunk) + 4357 sizeof(desc.data_bytes))) { 4358 break; 4359 } 4360 } else { 4361 if (chlen < sizeof(struct sctp_chunkhdr)) { 4362 break; 4363 } 4364 } 4365 } 4366 if (desc.chunk_type == SCTP_DATA) { 4367 /* can we get out the tsn? */ 4368 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4369 SCTP_STAT_INCR(sctps_pdrpmbda); 4370 4371 if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) { 4372 /* yep */ 4373 struct sctp_data_chunk *dcp; 4374 uint8_t *ddp; 4375 unsigned int iii; 4376 4377 dcp = (struct sctp_data_chunk *)ch; 4378 ddp = (uint8_t *) (dcp + 1); 4379 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) { 4380 desc.data_bytes[iii] = ddp[iii]; 4381 } 4382 desc.tsn_ifany = dcp->dp.tsn; 4383 } else { 4384 /* nope we are done. */ 4385 SCTP_STAT_INCR(sctps_pdrpnedat); 4386 break; 4387 } 4388 } else { 4389 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4390 SCTP_STAT_INCR(sctps_pdrpmbct); 4391 } 4392 4393 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) { 4394 SCTP_STAT_INCR(sctps_pdrppdbrk); 4395 break; 4396 } 4397 if (SCTP_SIZE32(at) > chlen) { 4398 break; 4399 } 4400 chlen -= SCTP_SIZE32(at); 4401 if (chlen < sizeof(struct sctp_chunkhdr)) { 4402 /* done, none left */ 4403 break; 4404 } 4405 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at)); 4406 } 4407 /* Now update any rwnd --- possibly */ 4408 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) { 4409 /* From a peer, we get a rwnd report */ 4410 uint32_t a_rwnd; 4411 4412 SCTP_STAT_INCR(sctps_pdrpfehos); 4413 4414 bottle_bw = ntohl(cp->bottle_bw); 4415 on_queue = ntohl(cp->current_onq); 4416 if (bottle_bw && on_queue) { 4417 /* a rwnd report is in here */ 4418 if (bottle_bw > on_queue) 4419 a_rwnd = bottle_bw - on_queue; 4420 else 4421 a_rwnd = 0; 4422 4423 if (a_rwnd == 0) 4424 stcb->asoc.peers_rwnd = 0; 4425 else { 4426 if (a_rwnd > stcb->asoc.total_flight) { 4427 stcb->asoc.peers_rwnd = 4428 a_rwnd - stcb->asoc.total_flight; 4429 } else { 4430 stcb->asoc.peers_rwnd = 0; 4431 } 4432 if (stcb->asoc.peers_rwnd < 4433 stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 4434 /* SWS sender side engages */ 4435 stcb->asoc.peers_rwnd = 0; 4436 } 4437 } 4438 } 4439 } else { 4440 SCTP_STAT_INCR(sctps_pdrpfmbox); 4441 } 4442 4443 /* now middle boxes in sat networks get a cwnd bump */ 4444 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) && 4445 (stcb->asoc.sat_t3_loss_recovery == 0) && 4446 (stcb->asoc.sat_network)) { 4447 /* 4448 * This is debateable but for sat networks it makes sense 4449 * Note if a T3 timer has went off, we will prohibit any 4450 * changes to cwnd until we exit the t3 loss recovery. 4451 */ 4452 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb, 4453 net, cp, &bottle_bw, &on_queue); 4454 } 4455} 4456 4457/* 4458 * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to 4459 * still contain IP/SCTP header - stcb: is the tcb found for this packet - 4460 * offset: offset into the mbuf chain to first chunkhdr - length: is the 4461 * length of the complete packet outputs: - length: modified to remaining 4462 * length after control processing - netp: modified to new sctp_nets after 4463 * cookie-echo processing - return NULL to discard the packet (ie. no asoc, 4464 * bad packet,...) otherwise return the tcb for this packet 4465 */ 4466#ifdef __GNUC__ 4467__attribute__((noinline)) 4468#endif 4469 static struct sctp_tcb * 4470 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length, 4471 struct sockaddr *src, struct sockaddr *dst, 4472 struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp, 4473 struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen, 4474 uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum, 4475 uint32_t vrf_id, uint16_t port) 4476{ 4477 struct sctp_association *asoc; 4478 struct mbuf *op_err; 4479 char msg[SCTP_DIAG_INFO_LEN]; 4480 uint32_t vtag_in; 4481 int num_chunks = 0; /* number of control chunks processed */ 4482 uint32_t chk_length; 4483 int ret; 4484 int abort_no_unlock = 0; 4485 int ecne_seen = 0; 4486 4487 /* 4488 * How big should this be, and should it be alloc'd? Lets try the 4489 * d-mtu-ceiling for now (2k) and that should hopefully work ... 4490 * until we get into jumbo grams and such.. 4491 */ 4492 uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE]; 4493 struct sctp_tcb *locked_tcb = stcb; 4494 int got_auth = 0; 4495 uint32_t auth_offset = 0, auth_len = 0; 4496 int auth_skipped = 0; 4497 int asconf_cnt = 0; 4498 4499#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4500 struct socket *so; 4501 4502#endif 4503 4504 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n", 4505 iphlen, *offset, length, (void *)stcb); 4506 4507 /* validate chunk header length... */ 4508 if (ntohs(ch->chunk_length) < sizeof(*ch)) { 4509 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n", 4510 ntohs(ch->chunk_length)); 4511 if (locked_tcb) { 4512 SCTP_TCB_UNLOCK(locked_tcb); 4513 } 4514 return (NULL); 4515 } 4516 /* 4517 * validate the verification tag 4518 */ 4519 vtag_in = ntohl(sh->v_tag); 4520 4521 if (locked_tcb) { 4522 SCTP_TCB_LOCK_ASSERT(locked_tcb); 4523 } 4524 if (ch->chunk_type == SCTP_INITIATION) { 4525 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n", 4526 ntohs(ch->chunk_length), vtag_in); 4527 if (vtag_in != 0) { 4528 /* protocol error- silently discard... */ 4529 SCTP_STAT_INCR(sctps_badvtag); 4530 if (locked_tcb) { 4531 SCTP_TCB_UNLOCK(locked_tcb); 4532 } 4533 return (NULL); 4534 } 4535 } else if (ch->chunk_type != SCTP_COOKIE_ECHO) { 4536 /* 4537 * If there is no stcb, skip the AUTH chunk and process 4538 * later after a stcb is found (to validate the lookup was 4539 * valid. 4540 */ 4541 if ((ch->chunk_type == SCTP_AUTHENTICATION) && 4542 (stcb == NULL) && 4543 (inp->auth_supported == 1)) { 4544 /* save this chunk for later processing */ 4545 auth_skipped = 1; 4546 auth_offset = *offset; 4547 auth_len = ntohs(ch->chunk_length); 4548 4549 /* (temporarily) move past this chunk */ 4550 *offset += SCTP_SIZE32(auth_len); 4551 if (*offset >= length) { 4552 /* no more data left in the mbuf chain */ 4553 *offset = length; 4554 if (locked_tcb) { 4555 SCTP_TCB_UNLOCK(locked_tcb); 4556 } 4557 return (NULL); 4558 } 4559 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4560 sizeof(struct sctp_chunkhdr), chunk_buf); 4561 } 4562 if (ch == NULL) { 4563 /* Help */ 4564 *offset = length; 4565 if (locked_tcb) { 4566 SCTP_TCB_UNLOCK(locked_tcb); 4567 } 4568 return (NULL); 4569 } 4570 if (ch->chunk_type == SCTP_COOKIE_ECHO) { 4571 goto process_control_chunks; 4572 } 4573 /* 4574 * first check if it's an ASCONF with an unknown src addr we 4575 * need to look inside to find the association 4576 */ 4577 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) { 4578 struct sctp_chunkhdr *asconf_ch = ch; 4579 uint32_t asconf_offset = 0, asconf_len = 0; 4580 4581 /* inp's refcount may be reduced */ 4582 SCTP_INP_INCR_REF(inp); 4583 4584 asconf_offset = *offset; 4585 do { 4586 asconf_len = ntohs(asconf_ch->chunk_length); 4587 if (asconf_len < sizeof(struct sctp_asconf_paramhdr)) 4588 break; 4589 stcb = sctp_findassociation_ep_asconf(m, 4590 *offset, 4591 dst, 4592 sh, &inp, netp, vrf_id); 4593 if (stcb != NULL) 4594 break; 4595 asconf_offset += SCTP_SIZE32(asconf_len); 4596 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset, 4597 sizeof(struct sctp_chunkhdr), chunk_buf); 4598 } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF); 4599 if (stcb == NULL) { 4600 /* 4601 * reduce inp's refcount if not reduced in 4602 * sctp_findassociation_ep_asconf(). 4603 */ 4604 SCTP_INP_DECR_REF(inp); 4605 } else { 4606 locked_tcb = stcb; 4607 } 4608 4609 /* now go back and verify any auth chunk to be sure */ 4610 if (auth_skipped && (stcb != NULL)) { 4611 struct sctp_auth_chunk *auth; 4612 4613 auth = (struct sctp_auth_chunk *) 4614 sctp_m_getptr(m, auth_offset, 4615 auth_len, chunk_buf); 4616 got_auth = 1; 4617 auth_skipped = 0; 4618 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, 4619 auth_offset)) { 4620 /* auth HMAC failed so dump it */ 4621 *offset = length; 4622 if (locked_tcb) { 4623 SCTP_TCB_UNLOCK(locked_tcb); 4624 } 4625 return (NULL); 4626 } else { 4627 /* remaining chunks are HMAC checked */ 4628 stcb->asoc.authenticated = 1; 4629 } 4630 } 4631 } 4632 if (stcb == NULL) { 4633 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 4634 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4635 msg); 4636 /* no association, so it's out of the blue... */ 4637 sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, op_err, 4638 mflowtype, mflowid, inp->fibnum, 4639 vrf_id, port); 4640 *offset = length; 4641 if (locked_tcb) { 4642 SCTP_TCB_UNLOCK(locked_tcb); 4643 } 4644 return (NULL); 4645 } 4646 asoc = &stcb->asoc; 4647 /* ABORT and SHUTDOWN can use either v_tag... */ 4648 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) || 4649 (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) || 4650 (ch->chunk_type == SCTP_PACKET_DROPPED)) { 4651 /* Take the T-bit always into account. */ 4652 if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) && 4653 (vtag_in == asoc->my_vtag)) || 4654 (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) && 4655 (vtag_in == asoc->peer_vtag))) { 4656 /* this is valid */ 4657 } else { 4658 /* drop this packet... */ 4659 SCTP_STAT_INCR(sctps_badvtag); 4660 if (locked_tcb) { 4661 SCTP_TCB_UNLOCK(locked_tcb); 4662 } 4663 return (NULL); 4664 } 4665 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 4666 if (vtag_in != asoc->my_vtag) { 4667 /* 4668 * this could be a stale SHUTDOWN-ACK or the 4669 * peer never got the SHUTDOWN-COMPLETE and 4670 * is still hung; we have started a new asoc 4671 * but it won't complete until the shutdown 4672 * is completed 4673 */ 4674 if (locked_tcb) { 4675 SCTP_TCB_UNLOCK(locked_tcb); 4676 } 4677 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 4678 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4679 msg); 4680 sctp_handle_ootb(m, iphlen, *offset, src, dst, 4681 sh, inp, op_err, 4682 mflowtype, mflowid, fibnum, 4683 vrf_id, port); 4684 return (NULL); 4685 } 4686 } else { 4687 /* for all other chunks, vtag must match */ 4688 if (vtag_in != asoc->my_vtag) { 4689 /* invalid vtag... */ 4690 SCTPDBG(SCTP_DEBUG_INPUT3, 4691 "invalid vtag: %xh, expect %xh\n", 4692 vtag_in, asoc->my_vtag); 4693 SCTP_STAT_INCR(sctps_badvtag); 4694 if (locked_tcb) { 4695 SCTP_TCB_UNLOCK(locked_tcb); 4696 } 4697 *offset = length; 4698 return (NULL); 4699 } 4700 } 4701 } /* end if !SCTP_COOKIE_ECHO */ 4702 /* 4703 * process all control chunks... 4704 */ 4705 if (((ch->chunk_type == SCTP_SELECTIVE_ACK) || 4706 (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) || 4707 (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) && 4708 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) { 4709 /* implied cookie-ack.. we must have lost the ack */ 4710 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4711 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4712 stcb->asoc.overall_error_count, 4713 0, 4714 SCTP_FROM_SCTP_INPUT, 4715 __LINE__); 4716 } 4717 stcb->asoc.overall_error_count = 0; 4718 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, 4719 *netp); 4720 } 4721process_control_chunks: 4722 while (IS_SCTP_CONTROL(ch)) { 4723 /* validate chunk length */ 4724 chk_length = ntohs(ch->chunk_length); 4725 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n", 4726 ch->chunk_type, chk_length); 4727 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length); 4728 if (chk_length < sizeof(*ch) || 4729 (*offset + (int)chk_length) > length) { 4730 *offset = length; 4731 if (locked_tcb) { 4732 SCTP_TCB_UNLOCK(locked_tcb); 4733 } 4734 return (NULL); 4735 } 4736 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks); 4737 /* 4738 * INIT-ACK only gets the init ack "header" portion only 4739 * because we don't have to process the peer's COOKIE. All 4740 * others get a complete chunk. 4741 */ 4742 if ((ch->chunk_type == SCTP_INITIATION_ACK) || 4743 (ch->chunk_type == SCTP_INITIATION)) { 4744 /* get an init-ack chunk */ 4745 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4746 sizeof(struct sctp_init_ack_chunk), chunk_buf); 4747 if (ch == NULL) { 4748 *offset = length; 4749 if (locked_tcb) { 4750 SCTP_TCB_UNLOCK(locked_tcb); 4751 } 4752 return (NULL); 4753 } 4754 } else { 4755 /* For cookies and all other chunks. */ 4756 if (chk_length > sizeof(chunk_buf)) { 4757 /* 4758 * use just the size of the chunk buffer so 4759 * the front part of our chunks fit in 4760 * contiguous space up to the chunk buffer 4761 * size (508 bytes). For chunks that need to 4762 * get more than that they must use the 4763 * sctp_m_getptr() function or other means 4764 * (e.g. know how to parse mbuf chains). 4765 * Cookies do this already. 4766 */ 4767 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4768 (sizeof(chunk_buf) - 4), 4769 chunk_buf); 4770 if (ch == NULL) { 4771 *offset = length; 4772 if (locked_tcb) { 4773 SCTP_TCB_UNLOCK(locked_tcb); 4774 } 4775 return (NULL); 4776 } 4777 } else { 4778 /* We can fit it all */ 4779 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4780 chk_length, chunk_buf); 4781 if (ch == NULL) { 4782 SCTP_PRINTF("sctp_process_control: Can't get the all data....\n"); 4783 *offset = length; 4784 if (locked_tcb) { 4785 SCTP_TCB_UNLOCK(locked_tcb); 4786 } 4787 return (NULL); 4788 } 4789 } 4790 } 4791 num_chunks++; 4792 /* Save off the last place we got a control from */ 4793 if (stcb != NULL) { 4794 if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) { 4795 /* 4796 * allow last_control to be NULL if 4797 * ASCONF... ASCONF processing will find the 4798 * right net later 4799 */ 4800 if ((netp != NULL) && (*netp != NULL)) 4801 stcb->asoc.last_control_chunk_from = *netp; 4802 } 4803 } 4804#ifdef SCTP_AUDITING_ENABLED 4805 sctp_audit_log(0xB0, ch->chunk_type); 4806#endif 4807 4808 /* check to see if this chunk required auth, but isn't */ 4809 if ((stcb != NULL) && 4810 (stcb->asoc.auth_supported == 1) && 4811 sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) && 4812 !stcb->asoc.authenticated) { 4813 /* "silently" ignore */ 4814 SCTP_STAT_INCR(sctps_recvauthmissing); 4815 goto next_chunk; 4816 } 4817 switch (ch->chunk_type) { 4818 case SCTP_INITIATION: 4819 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n"); 4820 /* The INIT chunk must be the only chunk. */ 4821 if ((num_chunks > 1) || 4822 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4823 /* RFC 4960 requires that no ABORT is sent */ 4824 *offset = length; 4825 if (locked_tcb) { 4826 SCTP_TCB_UNLOCK(locked_tcb); 4827 } 4828 return (NULL); 4829 } 4830 /* Honor our resource limit. */ 4831 if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) { 4832 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 4833 sctp_abort_association(inp, stcb, m, iphlen, 4834 src, dst, sh, op_err, 4835 mflowtype, mflowid, 4836 vrf_id, port); 4837 *offset = length; 4838 return (NULL); 4839 } 4840 sctp_handle_init(m, iphlen, *offset, src, dst, sh, 4841 (struct sctp_init_chunk *)ch, inp, 4842 stcb, &abort_no_unlock, 4843 mflowtype, mflowid, 4844 vrf_id, port); 4845 *offset = length; 4846 if ((!abort_no_unlock) && (locked_tcb)) { 4847 SCTP_TCB_UNLOCK(locked_tcb); 4848 } 4849 return (NULL); 4850 break; 4851 case SCTP_PAD_CHUNK: 4852 break; 4853 case SCTP_INITIATION_ACK: 4854 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT-ACK\n"); 4855 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4856 /* We are not interested anymore */ 4857 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4858 ; 4859 } else { 4860 if (locked_tcb != stcb) { 4861 /* Very unlikely */ 4862 SCTP_TCB_UNLOCK(locked_tcb); 4863 } 4864 *offset = length; 4865 if (stcb) { 4866#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4867 so = SCTP_INP_SO(inp); 4868 atomic_add_int(&stcb->asoc.refcnt, 1); 4869 SCTP_TCB_UNLOCK(stcb); 4870 SCTP_SOCKET_LOCK(so, 1); 4871 SCTP_TCB_LOCK(stcb); 4872 atomic_subtract_int(&stcb->asoc.refcnt, 1); 4873#endif 4874 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 4875 SCTP_FROM_SCTP_INPUT + SCTP_LOC_29); 4876#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4877 SCTP_SOCKET_UNLOCK(so, 1); 4878#endif 4879 } 4880 return (NULL); 4881 } 4882 } 4883 /* The INIT-ACK chunk must be the only chunk. */ 4884 if ((num_chunks > 1) || 4885 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4886 *offset = length; 4887 if (locked_tcb) { 4888 SCTP_TCB_UNLOCK(locked_tcb); 4889 } 4890 return (NULL); 4891 } 4892 if ((netp) && (*netp)) { 4893 ret = sctp_handle_init_ack(m, iphlen, *offset, 4894 src, dst, sh, 4895 (struct sctp_init_ack_chunk *)ch, 4896 stcb, *netp, 4897 &abort_no_unlock, 4898 mflowtype, mflowid, 4899 vrf_id); 4900 } else { 4901 ret = -1; 4902 } 4903 *offset = length; 4904 if (abort_no_unlock) { 4905 return (NULL); 4906 } 4907 /* 4908 * Special case, I must call the output routine to 4909 * get the cookie echoed 4910 */ 4911 if ((stcb != NULL) && (ret == 0)) { 4912 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 4913 } 4914 if (locked_tcb) { 4915 SCTP_TCB_UNLOCK(locked_tcb); 4916 } 4917 return (NULL); 4918 break; 4919 case SCTP_SELECTIVE_ACK: 4920 { 4921 struct sctp_sack_chunk *sack; 4922 int abort_now = 0; 4923 uint32_t a_rwnd, cum_ack; 4924 uint16_t num_seg, num_dup; 4925 uint8_t flags; 4926 int offset_seg, offset_dup; 4927 4928 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK\n"); 4929 SCTP_STAT_INCR(sctps_recvsacks); 4930 if (stcb == NULL) { 4931 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing SACK chunk\n"); 4932 break; 4933 } 4934 if (chk_length < sizeof(struct sctp_sack_chunk)) { 4935 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n"); 4936 break; 4937 } 4938 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4939 /*- 4940 * If we have sent a shutdown-ack, we will pay no 4941 * attention to a sack sent in to us since 4942 * we don't care anymore. 4943 */ 4944 break; 4945 } 4946 sack = (struct sctp_sack_chunk *)ch; 4947 flags = ch->chunk_flags; 4948 cum_ack = ntohl(sack->sack.cum_tsn_ack); 4949 num_seg = ntohs(sack->sack.num_gap_ack_blks); 4950 num_dup = ntohs(sack->sack.num_dup_tsns); 4951 a_rwnd = (uint32_t) ntohl(sack->sack.a_rwnd); 4952 if (sizeof(struct sctp_sack_chunk) + 4953 num_seg * sizeof(struct sctp_gap_ack_block) + 4954 num_dup * sizeof(uint32_t) != chk_length) { 4955 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n"); 4956 break; 4957 } 4958 offset_seg = *offset + sizeof(struct sctp_sack_chunk); 4959 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 4960 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n", 4961 cum_ack, num_seg, a_rwnd); 4962 stcb->asoc.seen_a_sack_this_pkt = 1; 4963 if ((stcb->asoc.pr_sctp_cnt == 0) && 4964 (num_seg == 0) && 4965 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 4966 (stcb->asoc.saw_sack_with_frags == 0) && 4967 (stcb->asoc.saw_sack_with_nr_frags == 0) && 4968 (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) 4969 ) { 4970 /* 4971 * We have a SIMPLE sack having no 4972 * prior segments and data on sent 4973 * queue to be acked.. Use the 4974 * faster path sack processing. We 4975 * also allow window update sacks 4976 * with no missing segments to go 4977 * this way too. 4978 */ 4979 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, &abort_now, ecne_seen); 4980 } else { 4981 if (netp && *netp) 4982 sctp_handle_sack(m, offset_seg, offset_dup, stcb, 4983 num_seg, 0, num_dup, &abort_now, flags, 4984 cum_ack, a_rwnd, ecne_seen); 4985 } 4986 if (abort_now) { 4987 /* ABORT signal from sack processing */ 4988 *offset = length; 4989 return (NULL); 4990 } 4991 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 4992 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 4993 (stcb->asoc.stream_queue_cnt == 0)) { 4994 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 4995 } 4996 } 4997 break; 4998 /* 4999 * EY - nr_sack: If the received chunk is an 5000 * nr_sack chunk 5001 */ 5002 case SCTP_NR_SELECTIVE_ACK: 5003 { 5004 struct sctp_nr_sack_chunk *nr_sack; 5005 int abort_now = 0; 5006 uint32_t a_rwnd, cum_ack; 5007 uint16_t num_seg, num_nr_seg, num_dup; 5008 uint8_t flags; 5009 int offset_seg, offset_dup; 5010 5011 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK\n"); 5012 SCTP_STAT_INCR(sctps_recvsacks); 5013 if (stcb == NULL) { 5014 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing NR-SACK chunk\n"); 5015 break; 5016 } 5017 if (stcb->asoc.nrsack_supported == 0) { 5018 goto unknown_chunk; 5019 } 5020 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) { 5021 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR-SACK chunk, too small\n"); 5022 break; 5023 } 5024 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 5025 /*- 5026 * If we have sent a shutdown-ack, we will pay no 5027 * attention to a sack sent in to us since 5028 * we don't care anymore. 5029 */ 5030 break; 5031 } 5032 nr_sack = (struct sctp_nr_sack_chunk *)ch; 5033 flags = ch->chunk_flags; 5034 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack); 5035 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks); 5036 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks); 5037 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns); 5038 a_rwnd = (uint32_t) ntohl(nr_sack->nr_sack.a_rwnd); 5039 if (sizeof(struct sctp_nr_sack_chunk) + 5040 (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) + 5041 num_dup * sizeof(uint32_t) != chk_length) { 5042 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n"); 5043 break; 5044 } 5045 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk); 5046 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 5047 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n", 5048 cum_ack, num_seg, a_rwnd); 5049 stcb->asoc.seen_a_sack_this_pkt = 1; 5050 if ((stcb->asoc.pr_sctp_cnt == 0) && 5051 (num_seg == 0) && (num_nr_seg == 0) && 5052 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 5053 (stcb->asoc.saw_sack_with_frags == 0) && 5054 (stcb->asoc.saw_sack_with_nr_frags == 0) && 5055 (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) { 5056 /* 5057 * We have a SIMPLE sack having no 5058 * prior segments and data on sent 5059 * queue to be acked. Use the faster 5060 * path sack processing. We also 5061 * allow window update sacks with no 5062 * missing segments to go this way 5063 * too. 5064 */ 5065 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, 5066 &abort_now, ecne_seen); 5067 } else { 5068 if (netp && *netp) 5069 sctp_handle_sack(m, offset_seg, offset_dup, stcb, 5070 num_seg, num_nr_seg, num_dup, &abort_now, flags, 5071 cum_ack, a_rwnd, ecne_seen); 5072 } 5073 if (abort_now) { 5074 /* ABORT signal from sack processing */ 5075 *offset = length; 5076 return (NULL); 5077 } 5078 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 5079 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 5080 (stcb->asoc.stream_queue_cnt == 0)) { 5081 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 5082 } 5083 } 5084 break; 5085 5086 case SCTP_HEARTBEAT_REQUEST: 5087 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n"); 5088 if ((stcb) && netp && *netp) { 5089 SCTP_STAT_INCR(sctps_recvheartbeat); 5090 sctp_send_heartbeat_ack(stcb, m, *offset, 5091 chk_length, *netp); 5092 5093 /* He's alive so give him credit */ 5094 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5095 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5096 stcb->asoc.overall_error_count, 5097 0, 5098 SCTP_FROM_SCTP_INPUT, 5099 __LINE__); 5100 } 5101 stcb->asoc.overall_error_count = 0; 5102 } 5103 break; 5104 case SCTP_HEARTBEAT_ACK: 5105 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT-ACK\n"); 5106 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) { 5107 /* Its not ours */ 5108 *offset = length; 5109 if (locked_tcb) { 5110 SCTP_TCB_UNLOCK(locked_tcb); 5111 } 5112 return (NULL); 5113 } 5114 /* He's alive so give him credit */ 5115 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5116 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5117 stcb->asoc.overall_error_count, 5118 0, 5119 SCTP_FROM_SCTP_INPUT, 5120 __LINE__); 5121 } 5122 stcb->asoc.overall_error_count = 0; 5123 SCTP_STAT_INCR(sctps_recvheartbeatack); 5124 if (netp && *netp) 5125 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch, 5126 stcb, *netp); 5127 break; 5128 case SCTP_ABORT_ASSOCIATION: 5129 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n", 5130 (void *)stcb); 5131 if ((stcb) && netp && *netp) 5132 sctp_handle_abort((struct sctp_abort_chunk *)ch, 5133 stcb, *netp); 5134 *offset = length; 5135 return (NULL); 5136 break; 5137 case SCTP_SHUTDOWN: 5138 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n", 5139 (void *)stcb); 5140 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) { 5141 *offset = length; 5142 if (locked_tcb) { 5143 SCTP_TCB_UNLOCK(locked_tcb); 5144 } 5145 return (NULL); 5146 } 5147 if (netp && *netp) { 5148 int abort_flag = 0; 5149 5150 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch, 5151 stcb, *netp, &abort_flag); 5152 if (abort_flag) { 5153 *offset = length; 5154 return (NULL); 5155 } 5156 } 5157 break; 5158 case SCTP_SHUTDOWN_ACK: 5159 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-ACK, stcb %p\n", (void *)stcb); 5160 if ((stcb) && (netp) && (*netp)) 5161 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp); 5162 *offset = length; 5163 return (NULL); 5164 break; 5165 5166 case SCTP_OPERATION_ERROR: 5167 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP-ERR\n"); 5168 if ((stcb) && netp && *netp && sctp_handle_error(ch, stcb, *netp) < 0) { 5169 *offset = length; 5170 return (NULL); 5171 } 5172 break; 5173 case SCTP_COOKIE_ECHO: 5174 SCTPDBG(SCTP_DEBUG_INPUT3, 5175 "SCTP_COOKIE-ECHO, stcb %p\n", (void *)stcb); 5176 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 5177 ; 5178 } else { 5179 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5180 /* We are not interested anymore */ 5181 abend: 5182 if (stcb) { 5183 SCTP_TCB_UNLOCK(stcb); 5184 } 5185 *offset = length; 5186 return (NULL); 5187 } 5188 } 5189 /* 5190 * First are we accepting? We do this again here 5191 * since it is possible that a previous endpoint WAS 5192 * listening responded to a INIT-ACK and then 5193 * closed. We opened and bound.. and are now no 5194 * longer listening. 5195 */ 5196 5197 if ((stcb == NULL) && (inp->sctp_socket->so_qlen >= inp->sctp_socket->so_qlimit)) { 5198 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 5199 (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) { 5200 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 5201 sctp_abort_association(inp, stcb, m, iphlen, 5202 src, dst, sh, op_err, 5203 mflowtype, mflowid, 5204 vrf_id, port); 5205 } 5206 *offset = length; 5207 return (NULL); 5208 } else { 5209 struct mbuf *ret_buf; 5210 struct sctp_inpcb *linp; 5211 5212 if (stcb) { 5213 linp = NULL; 5214 } else { 5215 linp = inp; 5216 } 5217 5218 if (linp) { 5219 SCTP_ASOC_CREATE_LOCK(linp); 5220 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 5221 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) { 5222 SCTP_ASOC_CREATE_UNLOCK(linp); 5223 goto abend; 5224 } 5225 } 5226 if (netp) { 5227 ret_buf = 5228 sctp_handle_cookie_echo(m, iphlen, 5229 *offset, 5230 src, dst, 5231 sh, 5232 (struct sctp_cookie_echo_chunk *)ch, 5233 &inp, &stcb, netp, 5234 auth_skipped, 5235 auth_offset, 5236 auth_len, 5237 &locked_tcb, 5238 mflowtype, 5239 mflowid, 5240 vrf_id, 5241 port); 5242 } else { 5243 ret_buf = NULL; 5244 } 5245 if (linp) { 5246 SCTP_ASOC_CREATE_UNLOCK(linp); 5247 } 5248 if (ret_buf == NULL) { 5249 if (locked_tcb) { 5250 SCTP_TCB_UNLOCK(locked_tcb); 5251 } 5252 SCTPDBG(SCTP_DEBUG_INPUT3, 5253 "GAK, null buffer\n"); 5254 *offset = length; 5255 return (NULL); 5256 } 5257 /* if AUTH skipped, see if it verified... */ 5258 if (auth_skipped) { 5259 got_auth = 1; 5260 auth_skipped = 0; 5261 } 5262 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) { 5263 /* 5264 * Restart the timer if we have 5265 * pending data 5266 */ 5267 struct sctp_tmit_chunk *chk; 5268 5269 chk = TAILQ_FIRST(&stcb->asoc.sent_queue); 5270 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 5271 } 5272 } 5273 break; 5274 case SCTP_COOKIE_ACK: 5275 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE-ACK, stcb %p\n", (void *)stcb); 5276 if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) { 5277 if (locked_tcb) { 5278 SCTP_TCB_UNLOCK(locked_tcb); 5279 } 5280 return (NULL); 5281 } 5282 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5283 /* We are not interested anymore */ 5284 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 5285 ; 5286 } else if (stcb) { 5287#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5288 so = SCTP_INP_SO(inp); 5289 atomic_add_int(&stcb->asoc.refcnt, 1); 5290 SCTP_TCB_UNLOCK(stcb); 5291 SCTP_SOCKET_LOCK(so, 1); 5292 SCTP_TCB_LOCK(stcb); 5293 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5294#endif 5295 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 5296 SCTP_FROM_SCTP_INPUT + SCTP_LOC_30); 5297#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5298 SCTP_SOCKET_UNLOCK(so, 1); 5299#endif 5300 *offset = length; 5301 return (NULL); 5302 } 5303 } 5304 /* He's alive so give him credit */ 5305 if ((stcb) && netp && *netp) { 5306 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5307 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5308 stcb->asoc.overall_error_count, 5309 0, 5310 SCTP_FROM_SCTP_INPUT, 5311 __LINE__); 5312 } 5313 stcb->asoc.overall_error_count = 0; 5314 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp); 5315 } 5316 break; 5317 case SCTP_ECN_ECHO: 5318 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-ECHO\n"); 5319 /* He's alive so give him credit */ 5320 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) { 5321 /* Its not ours */ 5322 if (locked_tcb) { 5323 SCTP_TCB_UNLOCK(locked_tcb); 5324 } 5325 *offset = length; 5326 return (NULL); 5327 } 5328 if (stcb) { 5329 if (stcb->asoc.ecn_supported == 0) { 5330 goto unknown_chunk; 5331 } 5332 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5333 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5334 stcb->asoc.overall_error_count, 5335 0, 5336 SCTP_FROM_SCTP_INPUT, 5337 __LINE__); 5338 } 5339 stcb->asoc.overall_error_count = 0; 5340 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, 5341 stcb); 5342 ecne_seen = 1; 5343 } 5344 break; 5345 case SCTP_ECN_CWR: 5346 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-CWR\n"); 5347 /* He's alive so give him credit */ 5348 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) { 5349 /* Its not ours */ 5350 if (locked_tcb) { 5351 SCTP_TCB_UNLOCK(locked_tcb); 5352 } 5353 *offset = length; 5354 return (NULL); 5355 } 5356 if (stcb) { 5357 if (stcb->asoc.ecn_supported == 0) { 5358 goto unknown_chunk; 5359 } 5360 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5361 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5362 stcb->asoc.overall_error_count, 5363 0, 5364 SCTP_FROM_SCTP_INPUT, 5365 __LINE__); 5366 } 5367 stcb->asoc.overall_error_count = 0; 5368 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp); 5369 } 5370 break; 5371 case SCTP_SHUTDOWN_COMPLETE: 5372 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-COMPLETE, stcb %p\n", (void *)stcb); 5373 /* must be first and only chunk */ 5374 if ((num_chunks > 1) || 5375 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 5376 *offset = length; 5377 if (locked_tcb) { 5378 SCTP_TCB_UNLOCK(locked_tcb); 5379 } 5380 return (NULL); 5381 } 5382 if ((stcb) && netp && *netp) { 5383 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch, 5384 stcb, *netp); 5385 } 5386 *offset = length; 5387 return (NULL); 5388 break; 5389 case SCTP_ASCONF: 5390 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n"); 5391 /* He's alive so give him credit */ 5392 if (stcb) { 5393 if (stcb->asoc.asconf_supported == 0) { 5394 goto unknown_chunk; 5395 } 5396 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5397 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5398 stcb->asoc.overall_error_count, 5399 0, 5400 SCTP_FROM_SCTP_INPUT, 5401 __LINE__); 5402 } 5403 stcb->asoc.overall_error_count = 0; 5404 sctp_handle_asconf(m, *offset, src, 5405 (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0); 5406 asconf_cnt++; 5407 } 5408 break; 5409 case SCTP_ASCONF_ACK: 5410 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF-ACK\n"); 5411 if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) { 5412 /* Its not ours */ 5413 if (locked_tcb) { 5414 SCTP_TCB_UNLOCK(locked_tcb); 5415 } 5416 *offset = length; 5417 return (NULL); 5418 } 5419 if ((stcb) && netp && *netp) { 5420 if (stcb->asoc.asconf_supported == 0) { 5421 goto unknown_chunk; 5422 } 5423 /* He's alive so give him credit */ 5424 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5425 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5426 stcb->asoc.overall_error_count, 5427 0, 5428 SCTP_FROM_SCTP_INPUT, 5429 __LINE__); 5430 } 5431 stcb->asoc.overall_error_count = 0; 5432 sctp_handle_asconf_ack(m, *offset, 5433 (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock); 5434 if (abort_no_unlock) 5435 return (NULL); 5436 } 5437 break; 5438 case SCTP_FORWARD_CUM_TSN: 5439 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD-TSN\n"); 5440 if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) { 5441 /* Its not ours */ 5442 if (locked_tcb) { 5443 SCTP_TCB_UNLOCK(locked_tcb); 5444 } 5445 *offset = length; 5446 return (NULL); 5447 } 5448 /* He's alive so give him credit */ 5449 if (stcb) { 5450 int abort_flag = 0; 5451 5452 if (stcb->asoc.prsctp_supported == 0) { 5453 goto unknown_chunk; 5454 } 5455 stcb->asoc.overall_error_count = 0; 5456 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5457 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5458 stcb->asoc.overall_error_count, 5459 0, 5460 SCTP_FROM_SCTP_INPUT, 5461 __LINE__); 5462 } 5463 *fwd_tsn_seen = 1; 5464 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5465 /* We are not interested anymore */ 5466#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5467 so = SCTP_INP_SO(inp); 5468 atomic_add_int(&stcb->asoc.refcnt, 1); 5469 SCTP_TCB_UNLOCK(stcb); 5470 SCTP_SOCKET_LOCK(so, 1); 5471 SCTP_TCB_LOCK(stcb); 5472 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5473#endif 5474 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 5475 SCTP_FROM_SCTP_INPUT + SCTP_LOC_31); 5476#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5477 SCTP_SOCKET_UNLOCK(so, 1); 5478#endif 5479 *offset = length; 5480 return (NULL); 5481 } 5482 sctp_handle_forward_tsn(stcb, 5483 (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset); 5484 if (abort_flag) { 5485 *offset = length; 5486 return (NULL); 5487 } else { 5488 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5489 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5490 stcb->asoc.overall_error_count, 5491 0, 5492 SCTP_FROM_SCTP_INPUT, 5493 __LINE__); 5494 } 5495 stcb->asoc.overall_error_count = 0; 5496 } 5497 5498 } 5499 break; 5500 case SCTP_STREAM_RESET: 5501 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n"); 5502 if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) { 5503 /* Its not ours */ 5504 if (locked_tcb) { 5505 SCTP_TCB_UNLOCK(locked_tcb); 5506 } 5507 *offset = length; 5508 return (NULL); 5509 } 5510 if (stcb->asoc.reconfig_supported == 0) { 5511 goto unknown_chunk; 5512 } 5513 if (sctp_handle_stream_reset(stcb, m, *offset, ch)) { 5514 /* stop processing */ 5515 *offset = length; 5516 return (NULL); 5517 } 5518 break; 5519 case SCTP_PACKET_DROPPED: 5520 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n"); 5521 /* re-get it all please */ 5522 if (chk_length < sizeof(struct sctp_pktdrop_chunk)) { 5523 /* Its not ours */ 5524 if (locked_tcb) { 5525 SCTP_TCB_UNLOCK(locked_tcb); 5526 } 5527 *offset = length; 5528 return (NULL); 5529 } 5530 if (ch && (stcb) && netp && (*netp)) { 5531 if (stcb->asoc.pktdrop_supported == 0) { 5532 goto unknown_chunk; 5533 } 5534 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch, 5535 stcb, *netp, 5536 min(chk_length, (sizeof(chunk_buf) - 4))); 5537 5538 } 5539 break; 5540 case SCTP_AUTHENTICATION: 5541 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n"); 5542 if (stcb == NULL) { 5543 /* save the first AUTH for later processing */ 5544 if (auth_skipped == 0) { 5545 auth_offset = *offset; 5546 auth_len = chk_length; 5547 auth_skipped = 1; 5548 } 5549 /* skip this chunk (temporarily) */ 5550 goto next_chunk; 5551 } 5552 if (stcb->asoc.auth_supported == 0) { 5553 goto unknown_chunk; 5554 } 5555 if ((chk_length < (sizeof(struct sctp_auth_chunk))) || 5556 (chk_length > (sizeof(struct sctp_auth_chunk) + 5557 SCTP_AUTH_DIGEST_LEN_MAX))) { 5558 /* Its not ours */ 5559 if (locked_tcb) { 5560 SCTP_TCB_UNLOCK(locked_tcb); 5561 } 5562 *offset = length; 5563 return (NULL); 5564 } 5565 if (got_auth == 1) { 5566 /* skip this chunk... it's already auth'd */ 5567 goto next_chunk; 5568 } 5569 got_auth = 1; 5570 if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch, 5571 m, *offset)) { 5572 /* auth HMAC failed so dump the packet */ 5573 *offset = length; 5574 return (stcb); 5575 } else { 5576 /* remaining chunks are HMAC checked */ 5577 stcb->asoc.authenticated = 1; 5578 } 5579 break; 5580 5581 default: 5582 unknown_chunk: 5583 /* it's an unknown chunk! */ 5584 if ((ch->chunk_type & 0x40) && (stcb != NULL)) { 5585 struct sctp_gen_error_cause *cause; 5586 int len; 5587 5588 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_gen_error_cause), 5589 0, M_NOWAIT, 1, MT_DATA); 5590 if (op_err != NULL) { 5591 len = min(SCTP_SIZE32(chk_length), (uint32_t) (length - *offset)); 5592 cause = mtod(op_err, struct sctp_gen_error_cause *); 5593 cause->code = htons(SCTP_CAUSE_UNRECOG_CHUNK); 5594 cause->length = htons(len + sizeof(struct sctp_gen_error_cause)); 5595 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_gen_error_cause); 5596 SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(m, *offset, len, M_NOWAIT); 5597 if (SCTP_BUF_NEXT(op_err) != NULL) { 5598#ifdef SCTP_MBUF_LOGGING 5599 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5600 sctp_log_mbc(SCTP_BUF_NEXT(op_err), SCTP_MBUF_ICOPY); 5601 } 5602#endif 5603 sctp_queue_op_err(stcb, op_err); 5604 } else { 5605 sctp_m_freem(op_err); 5606 } 5607 } 5608 } 5609 if ((ch->chunk_type & 0x80) == 0) { 5610 /* discard this packet */ 5611 *offset = length; 5612 return (stcb); 5613 } /* else skip this bad chunk and continue... */ 5614 break; 5615 } /* switch (ch->chunk_type) */ 5616 5617 5618next_chunk: 5619 /* get the next chunk */ 5620 *offset += SCTP_SIZE32(chk_length); 5621 if (*offset >= length) { 5622 /* no more data left in the mbuf chain */ 5623 break; 5624 } 5625 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 5626 sizeof(struct sctp_chunkhdr), chunk_buf); 5627 if (ch == NULL) { 5628 if (locked_tcb) { 5629 SCTP_TCB_UNLOCK(locked_tcb); 5630 } 5631 *offset = length; 5632 return (NULL); 5633 } 5634 } /* while */ 5635 5636 if (asconf_cnt > 0 && stcb != NULL) { 5637 sctp_send_asconf_ack(stcb); 5638 } 5639 return (stcb); 5640} 5641 5642 5643#ifdef INVARIANTS 5644#ifdef __GNUC__ 5645__attribute__((noinline)) 5646#endif 5647 void 5648 sctp_validate_no_locks(struct sctp_inpcb *inp) 5649{ 5650 struct sctp_tcb *lstcb; 5651 5652 LIST_FOREACH(lstcb, &inp->sctp_asoc_list, sctp_tcblist) { 5653 if (mtx_owned(&lstcb->tcb_mtx)) { 5654 panic("Own lock on stcb at return from input"); 5655 } 5656 } 5657 if (mtx_owned(&inp->inp_create_mtx)) { 5658 panic("Own create lock on inp"); 5659 } 5660 if (mtx_owned(&inp->inp_mtx)) { 5661 panic("Own inp lock on inp"); 5662 } 5663} 5664 5665#endif 5666 5667/* 5668 * common input chunk processing (v4 and v6) 5669 */ 5670void 5671sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length, 5672 struct sockaddr *src, struct sockaddr *dst, 5673 struct sctphdr *sh, struct sctp_chunkhdr *ch, 5674#if !defined(SCTP_WITH_NO_CSUM) 5675 uint8_t compute_crc, 5676#endif 5677 uint8_t ecn_bits, 5678 uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum, 5679 uint32_t vrf_id, uint16_t port) 5680{ 5681 uint32_t high_tsn; 5682 int fwd_tsn_seen = 0, data_processed = 0; 5683 struct mbuf *m = *mm, *op_err; 5684 char msg[SCTP_DIAG_INFO_LEN]; 5685 int un_sent; 5686 int cnt_ctrl_ready = 0; 5687 struct sctp_inpcb *inp = NULL, *inp_decr = NULL; 5688 struct sctp_tcb *stcb = NULL; 5689 struct sctp_nets *net = NULL; 5690 5691 SCTP_STAT_INCR(sctps_recvdatagrams); 5692#ifdef SCTP_AUDITING_ENABLED 5693 sctp_audit_log(0xE0, 1); 5694 sctp_auditing(0, inp, stcb, net); 5695#endif 5696#if !defined(SCTP_WITH_NO_CSUM) 5697 if (compute_crc != 0) { 5698 uint32_t check, calc_check; 5699 5700 check = sh->checksum; 5701 sh->checksum = 0; 5702 calc_check = sctp_calculate_cksum(m, iphlen); 5703 sh->checksum = check; 5704 if (calc_check != check) { 5705 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x m:%p mlen:%d iphlen:%d\n", 5706 calc_check, check, (void *)m, length, iphlen); 5707 stcb = sctp_findassociation_addr(m, offset, src, dst, 5708 sh, ch, &inp, &net, vrf_id); 5709#if defined(INET) || defined(INET6) 5710 if ((net != NULL) && (port != 0)) { 5711 if (net->port == 0) { 5712 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr)); 5713 } 5714 net->port = port; 5715 } 5716#endif 5717 if (net != NULL) { 5718 net->flowtype = mflowtype; 5719 net->flowid = mflowid; 5720 } 5721 if ((inp != NULL) && (stcb != NULL)) { 5722 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1); 5723 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED); 5724 } else if ((inp != NULL) && (stcb == NULL)) { 5725 inp_decr = inp; 5726 } 5727 SCTP_STAT_INCR(sctps_badsum); 5728 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors); 5729 goto out; 5730 } 5731 } 5732#endif 5733 /* Destination port of 0 is illegal, based on RFC4960. */ 5734 if (sh->dest_port == 0) { 5735 SCTP_STAT_INCR(sctps_hdrops); 5736 goto out; 5737 } 5738 stcb = sctp_findassociation_addr(m, offset, src, dst, 5739 sh, ch, &inp, &net, vrf_id); 5740#if defined(INET) || defined(INET6) 5741 if ((net != NULL) && (port != 0)) { 5742 if (net->port == 0) { 5743 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr)); 5744 } 5745 net->port = port; 5746 } 5747#endif 5748 if (net != NULL) { 5749 net->flowtype = mflowtype; 5750 net->flowid = mflowid; 5751 } 5752 if (inp == NULL) { 5753 SCTP_STAT_INCR(sctps_noport); 5754 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) { 5755 goto out; 5756 } 5757 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 5758 sctp_send_shutdown_complete2(src, dst, sh, 5759 mflowtype, mflowid, fibnum, 5760 vrf_id, port); 5761 goto out; 5762 } 5763 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) { 5764 goto out; 5765 } 5766 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) { 5767 if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) || 5768 ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) && 5769 (ch->chunk_type != SCTP_INIT))) { 5770 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5771 "Out of the blue"); 5772 sctp_send_abort(m, iphlen, src, dst, 5773 sh, 0, op_err, 5774 mflowtype, mflowid, fibnum, 5775 vrf_id, port); 5776 } 5777 } 5778 goto out; 5779 } else if (stcb == NULL) { 5780 inp_decr = inp; 5781 } 5782#ifdef IPSEC 5783 /*- 5784 * I very much doubt any of the IPSEC stuff will work but I have no 5785 * idea, so I will leave it in place. 5786 */ 5787 if (inp != NULL) { 5788 switch (dst->sa_family) { 5789#ifdef INET 5790 case AF_INET: 5791 if (ipsec4_in_reject(m, &inp->ip_inp.inp)) { 5792 SCTP_STAT_INCR(sctps_hdrops); 5793 goto out; 5794 } 5795 break; 5796#endif 5797#ifdef INET6 5798 case AF_INET6: 5799 if (ipsec6_in_reject(m, &inp->ip_inp.inp)) { 5800 SCTP_STAT_INCR(sctps_hdrops); 5801 goto out; 5802 } 5803 break; 5804#endif 5805 default: 5806 break; 5807 } 5808 } 5809#endif 5810 SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n", 5811 (void *)m, iphlen, offset, length, (void *)stcb); 5812 if (stcb) { 5813 /* always clear this before beginning a packet */ 5814 stcb->asoc.authenticated = 0; 5815 stcb->asoc.seen_a_sack_this_pkt = 0; 5816 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n", 5817 (void *)stcb, stcb->asoc.state); 5818 5819 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) || 5820 (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) { 5821 /*- 5822 * If we hit here, we had a ref count 5823 * up when the assoc was aborted and the 5824 * timer is clearing out the assoc, we should 5825 * NOT respond to any packet.. its OOTB. 5826 */ 5827 SCTP_TCB_UNLOCK(stcb); 5828 stcb = NULL; 5829 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5830 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5831 msg); 5832 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5833 mflowtype, mflowid, inp->fibnum, 5834 vrf_id, port); 5835 goto out; 5836 } 5837 } 5838 if (IS_SCTP_CONTROL(ch)) { 5839 /* process the control portion of the SCTP packet */ 5840 /* sa_ignore NO_NULL_CHK */ 5841 stcb = sctp_process_control(m, iphlen, &offset, length, 5842 src, dst, sh, ch, 5843 inp, stcb, &net, &fwd_tsn_seen, 5844 mflowtype, mflowid, fibnum, 5845 vrf_id, port); 5846 if (stcb) { 5847 /* 5848 * This covers us if the cookie-echo was there and 5849 * it changes our INP. 5850 */ 5851 inp = stcb->sctp_ep; 5852#if defined(INET) || defined(INET6) 5853 if ((net != NULL) && (port != 0)) { 5854 if (net->port == 0) { 5855 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr)); 5856 } 5857 net->port = port; 5858 } 5859#endif 5860 } 5861 } else { 5862 /* 5863 * no control chunks, so pre-process DATA chunks (these 5864 * checks are taken care of by control processing) 5865 */ 5866 5867 /* 5868 * if DATA only packet, and auth is required, then punt... 5869 * can't have authenticated without any AUTH (control) 5870 * chunks 5871 */ 5872 if ((stcb != NULL) && 5873 (stcb->asoc.auth_supported == 1) && 5874 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) { 5875 /* "silently" ignore */ 5876 SCTP_STAT_INCR(sctps_recvauthmissing); 5877 goto out; 5878 } 5879 if (stcb == NULL) { 5880 /* out of the blue DATA chunk */ 5881 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5882 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5883 msg); 5884 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5885 mflowtype, mflowid, fibnum, 5886 vrf_id, port); 5887 goto out; 5888 } 5889 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) { 5890 /* v_tag mismatch! */ 5891 SCTP_STAT_INCR(sctps_badvtag); 5892 goto out; 5893 } 5894 } 5895 5896 if (stcb == NULL) { 5897 /* 5898 * no valid TCB for this packet, or we found it's a bad 5899 * packet while processing control, or we're done with this 5900 * packet (done or skip rest of data), so we drop it... 5901 */ 5902 goto out; 5903 } 5904 /* 5905 * DATA chunk processing 5906 */ 5907 /* plow through the data chunks while length > offset */ 5908 5909 /* 5910 * Rest should be DATA only. Check authentication state if AUTH for 5911 * DATA is required. 5912 */ 5913 if ((length > offset) && 5914 (stcb != NULL) && 5915 (stcb->asoc.auth_supported == 1) && 5916 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) && 5917 !stcb->asoc.authenticated) { 5918 /* "silently" ignore */ 5919 SCTP_STAT_INCR(sctps_recvauthmissing); 5920 SCTPDBG(SCTP_DEBUG_AUTH1, 5921 "Data chunk requires AUTH, skipped\n"); 5922 goto trigger_send; 5923 } 5924 if (length > offset) { 5925 int retval; 5926 5927 /* 5928 * First check to make sure our state is correct. We would 5929 * not get here unless we really did have a tag, so we don't 5930 * abort if this happens, just dump the chunk silently. 5931 */ 5932 switch (SCTP_GET_STATE(&stcb->asoc)) { 5933 case SCTP_STATE_COOKIE_ECHOED: 5934 /* 5935 * we consider data with valid tags in this state 5936 * shows us the cookie-ack was lost. Imply it was 5937 * there. 5938 */ 5939 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5940 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5941 stcb->asoc.overall_error_count, 5942 0, 5943 SCTP_FROM_SCTP_INPUT, 5944 __LINE__); 5945 } 5946 stcb->asoc.overall_error_count = 0; 5947 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net); 5948 break; 5949 case SCTP_STATE_COOKIE_WAIT: 5950 /* 5951 * We consider OOTB any data sent during asoc setup. 5952 */ 5953 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5954 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5955 msg); 5956 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5957 mflowtype, mflowid, inp->fibnum, 5958 vrf_id, port); 5959 goto out; 5960 /* sa_ignore NOTREACHED */ 5961 break; 5962 case SCTP_STATE_EMPTY: /* should not happen */ 5963 case SCTP_STATE_INUSE: /* should not happen */ 5964 case SCTP_STATE_SHUTDOWN_RECEIVED: /* This is a peer error */ 5965 case SCTP_STATE_SHUTDOWN_ACK_SENT: 5966 default: 5967 goto out; 5968 /* sa_ignore NOTREACHED */ 5969 break; 5970 case SCTP_STATE_OPEN: 5971 case SCTP_STATE_SHUTDOWN_SENT: 5972 break; 5973 } 5974 /* plow through the data chunks while length > offset */ 5975 retval = sctp_process_data(mm, iphlen, &offset, length, 5976 inp, stcb, net, &high_tsn); 5977 if (retval == 2) { 5978 /* 5979 * The association aborted, NO UNLOCK needed since 5980 * the association is destroyed. 5981 */ 5982 stcb = NULL; 5983 goto out; 5984 } 5985 data_processed = 1; 5986 /* 5987 * Anything important needs to have been m_copy'ed in 5988 * process_data 5989 */ 5990 } 5991 /* take care of ecn */ 5992 if ((data_processed == 1) && 5993 (stcb->asoc.ecn_supported == 1) && 5994 ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) { 5995 /* Yep, we need to add a ECNE */ 5996 sctp_send_ecn_echo(stcb, net, high_tsn); 5997 } 5998 if ((data_processed == 0) && (fwd_tsn_seen)) { 5999 int was_a_gap; 6000 uint32_t highest_tsn; 6001 6002 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) { 6003 highest_tsn = stcb->asoc.highest_tsn_inside_nr_map; 6004 } else { 6005 highest_tsn = stcb->asoc.highest_tsn_inside_map; 6006 } 6007 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn); 6008 stcb->asoc.send_sack = 1; 6009 sctp_sack_check(stcb, was_a_gap); 6010 } else if (fwd_tsn_seen) { 6011 stcb->asoc.send_sack = 1; 6012 } 6013 /* trigger send of any chunks in queue... */ 6014trigger_send: 6015#ifdef SCTP_AUDITING_ENABLED 6016 sctp_audit_log(0xE0, 2); 6017 sctp_auditing(1, inp, stcb, net); 6018#endif 6019 SCTPDBG(SCTP_DEBUG_INPUT1, 6020 "Check for chunk output prw:%d tqe:%d tf=%d\n", 6021 stcb->asoc.peers_rwnd, 6022 TAILQ_EMPTY(&stcb->asoc.control_send_queue), 6023 stcb->asoc.total_flight); 6024 un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight); 6025 if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 6026 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq; 6027 } 6028 if (cnt_ctrl_ready || stcb->asoc.trigger_reset || 6029 ((un_sent) && 6030 (stcb->asoc.peers_rwnd > 0 || 6031 (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) { 6032 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n"); 6033 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 6034 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n"); 6035 } 6036#ifdef SCTP_AUDITING_ENABLED 6037 sctp_audit_log(0xE0, 3); 6038 sctp_auditing(2, inp, stcb, net); 6039#endif 6040out: 6041 if (stcb != NULL) { 6042 SCTP_TCB_UNLOCK(stcb); 6043 } 6044 if (inp_decr != NULL) { 6045 /* reduce ref-count */ 6046 SCTP_INP_WLOCK(inp_decr); 6047 SCTP_INP_DECR_REF(inp_decr); 6048 SCTP_INP_WUNLOCK(inp_decr); 6049 } 6050#ifdef INVARIANTS 6051 if (inp != NULL) { 6052 sctp_validate_no_locks(inp); 6053 } 6054#endif 6055 return; 6056} 6057 6058#ifdef INET 6059void 6060sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port) 6061{ 6062 struct mbuf *m; 6063 int iphlen; 6064 uint32_t vrf_id = 0; 6065 uint8_t ecn_bits; 6066 struct sockaddr_in src, dst; 6067 struct ip *ip; 6068 struct sctphdr *sh; 6069 struct sctp_chunkhdr *ch; 6070 int length, offset; 6071 6072#if !defined(SCTP_WITH_NO_CSUM) 6073 uint8_t compute_crc; 6074 6075#endif 6076 uint32_t mflowid; 6077 uint8_t mflowtype; 6078 uint16_t fibnum; 6079 6080 iphlen = off; 6081 if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) { 6082 SCTP_RELEASE_PKT(i_pak); 6083 return; 6084 } 6085 m = SCTP_HEADER_TO_CHAIN(i_pak); 6086#ifdef SCTP_MBUF_LOGGING 6087 /* Log in any input mbufs */ 6088 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 6089 sctp_log_mbc(m, SCTP_MBUF_INPUT); 6090 } 6091#endif 6092#ifdef SCTP_PACKET_LOGGING 6093 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) { 6094 sctp_packet_log(m); 6095 } 6096#endif 6097 SCTPDBG(SCTP_DEBUG_CRCOFFLOAD, 6098 "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n", 6099 m->m_pkthdr.len, 6100 if_name(m->m_pkthdr.rcvif), 6101 (int)m->m_pkthdr.csum_flags, CSUM_BITS); 6102 mflowid = m->m_pkthdr.flowid; 6103 mflowtype = M_HASHTYPE_GET(m); 6104 fibnum = M_GETFIB(m); 6105 SCTP_STAT_INCR(sctps_recvpackets); 6106 SCTP_STAT_INCR_COUNTER64(sctps_inpackets); 6107 /* Get IP, SCTP, and first chunk header together in the first mbuf. */ 6108 offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr); 6109 if (SCTP_BUF_LEN(m) < offset) { 6110 if ((m = m_pullup(m, offset)) == NULL) { 6111 SCTP_STAT_INCR(sctps_hdrops); 6112 return; 6113 } 6114 } 6115 ip = mtod(m, struct ip *); 6116 sh = (struct sctphdr *)((caddr_t)ip + iphlen); 6117 ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr)); 6118 offset -= sizeof(struct sctp_chunkhdr); 6119 memset(&src, 0, sizeof(struct sockaddr_in)); 6120 src.sin_family = AF_INET; 6121 src.sin_len = sizeof(struct sockaddr_in); 6122 src.sin_port = sh->src_port; 6123 src.sin_addr = ip->ip_src; 6124 memset(&dst, 0, sizeof(struct sockaddr_in)); 6125 dst.sin_family = AF_INET; 6126 dst.sin_len = sizeof(struct sockaddr_in); 6127 dst.sin_port = sh->dest_port; 6128 dst.sin_addr = ip->ip_dst; 6129 length = ntohs(ip->ip_len); 6130 /* Validate mbuf chain length with IP payload length. */ 6131 if (SCTP_HEADER_LEN(m) != length) { 6132 SCTPDBG(SCTP_DEBUG_INPUT1, 6133 "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m)); 6134 SCTP_STAT_INCR(sctps_hdrops); 6135 goto out; 6136 } 6137 /* SCTP does not allow broadcasts or multicasts */ 6138 if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) { 6139 goto out; 6140 } 6141 if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) { 6142 goto out; 6143 } 6144 ecn_bits = ip->ip_tos; 6145#if defined(SCTP_WITH_NO_CSUM) 6146 SCTP_STAT_INCR(sctps_recvnocrc); 6147#else 6148 if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) { 6149 SCTP_STAT_INCR(sctps_recvhwcrc); 6150 compute_crc = 0; 6151 } else { 6152 SCTP_STAT_INCR(sctps_recvswcrc); 6153 compute_crc = 1; 6154 } 6155#endif 6156 sctp_common_input_processing(&m, iphlen, offset, length, 6157 (struct sockaddr *)&src, 6158 (struct sockaddr *)&dst, 6159 sh, ch, 6160#if !defined(SCTP_WITH_NO_CSUM) 6161 compute_crc, 6162#endif 6163 ecn_bits, 6164 mflowtype, mflowid, fibnum, 6165 vrf_id, port); 6166out: 6167 if (m) { 6168 sctp_m_freem(m); 6169 } 6170 return; 6171} 6172 6173#if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP) 6174extern int *sctp_cpuarry; 6175 6176#endif 6177 6178int 6179sctp_input(struct mbuf **mp, int *offp, int proto SCTP_UNUSED) 6180{ 6181 struct mbuf *m; 6182 int off; 6183 6184 m = *mp; 6185 off = *offp; 6186#if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP) 6187 if (mp_ncpus > 1) { 6188 struct ip *ip; 6189 struct sctphdr *sh; 6190 int offset; 6191 int cpu_to_use; 6192 uint32_t flowid, tag; 6193 6194 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) { 6195 flowid = m->m_pkthdr.flowid; 6196 } else { 6197 /* 6198 * No flow id built by lower layers fix it so we 6199 * create one. 6200 */ 6201 offset = off + sizeof(struct sctphdr); 6202 if (SCTP_BUF_LEN(m) < offset) { 6203 if ((m = m_pullup(m, offset)) == NULL) { 6204 SCTP_STAT_INCR(sctps_hdrops); 6205 return (IPPROTO_DONE); 6206 } 6207 } 6208 ip = mtod(m, struct ip *); 6209 sh = (struct sctphdr *)((caddr_t)ip + off); 6210 tag = htonl(sh->v_tag); 6211 flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port); 6212 m->m_pkthdr.flowid = flowid; 6213 M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE); 6214 } 6215 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus]; 6216 sctp_queue_to_mcore(m, off, cpu_to_use); 6217 return (IPPROTO_DONE); 6218 } 6219#endif 6220 sctp_input_with_port(m, off, 0); 6221 return (IPPROTO_DONE); 6222} 6223 6224#endif 6225