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sys/netinet/sctp_input.c
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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: releng/10.2/sys/netinet/sctp_input.c 284634 2015-06-20 08:28:47Z 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 57 static void 58 sctp_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 */ 84 static void 85 sctp_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 } 207 outnow: 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 */ 216 217 int 218 sctp_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 } 281 282 static int 283 sctp_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 } 361 } 362 /* cut back the count */ 363 asoc->pre_open_streams = newcnt; 364 } 365 SCTP_TCB_SEND_UNLOCK(stcb); 366 asoc->strm_realoutsize = asoc->streamoutcnt = asoc->pre_open_streams; 367 368 /* EY - nr_sack: initialize highest tsn in nr_mapping_array */ 369 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 370 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 371 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 372 } 373 /* This is the next one we expect */ 374 asoc->str_reset_seq_in = asoc->asconf_seq_in + 1; 375 376 asoc->mapping_array_base_tsn = ntohl(init->initial_tsn); 377 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in; 378 379 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 380 /* open the requested streams */ 381 382 if (asoc->strmin != NULL) { 383 /* Free the old ones */ 384 struct sctp_queued_to_read *ctl, *nctl; 385 386 for (i = 0; i < asoc->streamincnt; i++) { 387 TAILQ_FOREACH_SAFE(ctl, &asoc->strmin[i].inqueue, next, nctl) { 388 TAILQ_REMOVE(&asoc->strmin[i].inqueue, ctl, next); 389 sctp_free_remote_addr(ctl->whoFrom); 390 ctl->whoFrom = NULL; 391 sctp_m_freem(ctl->data); 392 ctl->data = NULL; 393 sctp_free_a_readq(stcb, ctl); 394 } 395 } 396 SCTP_FREE(asoc->strmin, SCTP_M_STRMI); 397 } 398 if (asoc->max_inbound_streams > ntohs(init->num_outbound_streams)) { 399 asoc->streamincnt = ntohs(init->num_outbound_streams); 400 } else { 401 asoc->streamincnt = asoc->max_inbound_streams; 402 } 403 SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt * 404 sizeof(struct sctp_stream_in), SCTP_M_STRMI); 405 if (asoc->strmin == NULL) { 406 /* we didn't get memory for the streams! */ 407 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n"); 408 return (-1); 409 } 410 for (i = 0; i < asoc->streamincnt; i++) { 411 asoc->strmin[i].stream_no = i; 412 asoc->strmin[i].last_sequence_delivered = 0xffff; 413 TAILQ_INIT(&asoc->strmin[i].inqueue); 414 asoc->strmin[i].delivery_started = 0; 415 } 416 /* 417 * load_address_from_init will put the addresses into the 418 * association when the COOKIE is processed or the INIT-ACK is 419 * processed. Both types of COOKIE's existing and new call this 420 * routine. It will remove addresses that are no longer in the 421 * association (for the restarting case where addresses are 422 * removed). Up front when the INIT arrives we will discard it if it 423 * is a restart and new addresses have been added. 424 */ 425 /* sa_ignore MEMLEAK */ 426 return (0); 427 } 428 429 /* 430 * INIT-ACK message processing/consumption returns value < 0 on error 431 */ 432 static int 433 sctp_process_init_ack(struct mbuf *m, int iphlen, int offset, 434 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 435 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 436 struct sctp_nets *net, int *abort_no_unlock, 437 uint8_t mflowtype, uint32_t mflowid, 438 uint32_t vrf_id) 439 { 440 struct sctp_association *asoc; 441 struct mbuf *op_err; 442 int retval, abort_flag; 443 uint32_t initack_limit; 444 int nat_friendly = 0; 445 446 /* First verify that we have no illegal param's */ 447 abort_flag = 0; 448 449 op_err = sctp_arethere_unrecognized_parameters(m, 450 (offset + sizeof(struct sctp_init_chunk)), 451 &abort_flag, (struct sctp_chunkhdr *)cp, &nat_friendly); 452 if (abort_flag) { 453 /* Send an abort and notify peer */ 454 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 455 *abort_no_unlock = 1; 456 return (-1); 457 } 458 asoc = &stcb->asoc; 459 asoc->peer_supports_nat = (uint8_t) nat_friendly; 460 /* process the peer's parameters in the INIT-ACK */ 461 retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb); 462 if (retval < 0) { 463 return (retval); 464 } 465 initack_limit = offset + ntohs(cp->ch.chunk_length); 466 /* load all addresses */ 467 if ((retval = sctp_load_addresses_from_init(stcb, m, 468 (offset + sizeof(struct sctp_init_chunk)), initack_limit, 469 src, dst, NULL))) { 470 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 471 "Problem with address parameters"); 472 SCTPDBG(SCTP_DEBUG_INPUT1, 473 "Load addresses from INIT causes an abort %d\n", 474 retval); 475 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 476 src, dst, sh, op_err, 477 mflowtype, mflowid, 478 vrf_id, net->port); 479 *abort_no_unlock = 1; 480 return (-1); 481 } 482 /* if the peer doesn't support asconf, flush the asconf queue */ 483 if (asoc->asconf_supported == 0) { 484 struct sctp_asconf_addr *param, *nparam; 485 486 TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) { 487 TAILQ_REMOVE(&asoc->asconf_queue, param, next); 488 SCTP_FREE(param, SCTP_M_ASC_ADDR); 489 } 490 } 491 stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs, 492 stcb->asoc.local_hmacs); 493 if (op_err) { 494 sctp_queue_op_err(stcb, op_err); 495 /* queuing will steal away the mbuf chain to the out queue */ 496 op_err = NULL; 497 } 498 /* extract the cookie and queue it to "echo" it back... */ 499 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 500 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 501 stcb->asoc.overall_error_count, 502 0, 503 SCTP_FROM_SCTP_INPUT, 504 __LINE__); 505 } 506 stcb->asoc.overall_error_count = 0; 507 net->error_count = 0; 508 509 /* 510 * Cancel the INIT timer, We do this first before queueing the 511 * cookie. We always cancel at the primary to assue that we are 512 * canceling the timer started by the INIT which always goes to the 513 * primary. 514 */ 515 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb, 516 asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3); 517 518 /* calculate the RTO */ 519 net->RTO = sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, sctp_align_safe_nocopy, 520 SCTP_RTT_FROM_NON_DATA); 521 522 retval = sctp_send_cookie_echo(m, offset, stcb, net); 523 if (retval < 0) { 524 /* 525 * No cookie, we probably should send a op error. But in any 526 * case if there is no cookie in the INIT-ACK, we can 527 * abandon the peer, its broke. 528 */ 529 if (retval == -3) { 530 /* We abort with an error of missing mandatory param */ 531 op_err = sctp_generate_cause(SCTP_CAUSE_MISSING_PARAM, ""); 532 if (op_err) { 533 /* 534 * Expand beyond to include the mandatory 535 * param cookie 536 */ 537 struct sctp_inv_mandatory_param *mp; 538 539 SCTP_BUF_LEN(op_err) = 540 sizeof(struct sctp_inv_mandatory_param); 541 mp = mtod(op_err, 542 struct sctp_inv_mandatory_param *); 543 /* Subtract the reserved param */ 544 mp->length = 545 htons(sizeof(struct sctp_inv_mandatory_param) - 2); 546 mp->num_param = htonl(1); 547 mp->param = htons(SCTP_STATE_COOKIE); 548 mp->resv = 0; 549 } 550 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 551 src, dst, sh, op_err, 552 mflowtype, mflowid, 553 vrf_id, net->port); 554 *abort_no_unlock = 1; 555 } 556 return (retval); 557 } 558 return (0); 559 } 560 561 static void 562 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp, 563 struct sctp_tcb *stcb, struct sctp_nets *net) 564 { 565 union sctp_sockstore store; 566 struct sctp_nets *r_net, *f_net; 567 struct timeval tv; 568 int req_prim = 0; 569 uint16_t old_error_counter; 570 571 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) { 572 /* Invalid length */ 573 return; 574 } 575 memset(&store, 0, sizeof(store)); 576 switch (cp->heartbeat.hb_info.addr_family) { 577 #ifdef INET 578 case AF_INET: 579 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) { 580 store.sin.sin_family = cp->heartbeat.hb_info.addr_family; 581 store.sin.sin_len = cp->heartbeat.hb_info.addr_len; 582 store.sin.sin_port = stcb->rport; 583 memcpy(&store.sin.sin_addr, cp->heartbeat.hb_info.address, 584 sizeof(store.sin.sin_addr)); 585 } else { 586 return; 587 } 588 break; 589 #endif 590 #ifdef INET6 591 case AF_INET6: 592 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) { 593 store.sin6.sin6_family = cp->heartbeat.hb_info.addr_family; 594 store.sin6.sin6_len = cp->heartbeat.hb_info.addr_len; 595 store.sin6.sin6_port = stcb->rport; 596 memcpy(&store.sin6.sin6_addr, cp->heartbeat.hb_info.address, sizeof(struct in6_addr)); 597 } else { 598 return; 599 } 600 break; 601 #endif 602 default: 603 return; 604 } 605 r_net = sctp_findnet(stcb, &store.sa); 606 if (r_net == NULL) { 607 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n"); 608 return; 609 } 610 if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) && 611 (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) && 612 (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) { 613 /* 614 * If the its a HB and it's random value is correct when can 615 * confirm the destination. 616 */ 617 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 618 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) { 619 stcb->asoc.primary_destination = r_net; 620 r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY; 621 f_net = TAILQ_FIRST(&stcb->asoc.nets); 622 if (f_net != r_net) { 623 /* 624 * first one on the list is NOT the primary 625 * sctp_cmpaddr() is much more efficent if 626 * the primary is the first on the list, 627 * make it so. 628 */ 629 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next); 630 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next); 631 } 632 req_prim = 1; 633 } 634 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 635 stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 636 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, 637 r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4); 638 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 639 } 640 old_error_counter = r_net->error_count; 641 r_net->error_count = 0; 642 r_net->hb_responded = 1; 643 tv.tv_sec = cp->heartbeat.hb_info.time_value_1; 644 tv.tv_usec = cp->heartbeat.hb_info.time_value_2; 645 /* Now lets do a RTO with this */ 646 r_net->RTO = sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, sctp_align_safe_nocopy, 647 SCTP_RTT_FROM_NON_DATA); 648 if (!(r_net->dest_state & SCTP_ADDR_REACHABLE)) { 649 r_net->dest_state |= SCTP_ADDR_REACHABLE; 650 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb, 651 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 652 } 653 if (r_net->dest_state & SCTP_ADDR_PF) { 654 r_net->dest_state &= ~SCTP_ADDR_PF; 655 stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net); 656 } 657 if (old_error_counter > 0) { 658 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 659 stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_5); 660 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 661 } 662 if (r_net == stcb->asoc.primary_destination) { 663 if (stcb->asoc.alternate) { 664 /* release the alternate, primary is good */ 665 sctp_free_remote_addr(stcb->asoc.alternate); 666 stcb->asoc.alternate = NULL; 667 } 668 } 669 /* Mobility adaptation */ 670 if (req_prim) { 671 if ((sctp_is_mobility_feature_on(stcb->sctp_ep, 672 SCTP_MOBILITY_BASE) || 673 sctp_is_mobility_feature_on(stcb->sctp_ep, 674 SCTP_MOBILITY_FASTHANDOFF)) && 675 sctp_is_mobility_feature_on(stcb->sctp_ep, 676 SCTP_MOBILITY_PRIM_DELETED)) { 677 678 sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED, 679 stcb->sctp_ep, stcb, NULL, 680 SCTP_FROM_SCTP_INPUT + SCTP_LOC_6); 681 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 682 SCTP_MOBILITY_FASTHANDOFF)) { 683 sctp_assoc_immediate_retrans(stcb, 684 stcb->asoc.primary_destination); 685 } 686 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 687 SCTP_MOBILITY_BASE)) { 688 sctp_move_chunks_from_net(stcb, 689 stcb->asoc.deleted_primary); 690 } 691 sctp_delete_prim_timer(stcb->sctp_ep, stcb, 692 stcb->asoc.deleted_primary); 693 } 694 } 695 } 696 697 static int 698 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb) 699 { 700 /* 701 * return 0 means we want you to proceed with the abort non-zero 702 * means no abort processing 703 */ 704 struct sctpasochead *head; 705 706 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_WAIT) { 707 /* generate a new vtag and send init */ 708 LIST_REMOVE(stcb, sctp_asocs); 709 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 710 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 711 /* 712 * put it in the bucket in the vtag hash of assoc's for the 713 * system 714 */ 715 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 716 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 717 return (1); 718 } 719 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) { 720 /* 721 * treat like a case where the cookie expired i.e.: - dump 722 * current cookie. - generate a new vtag. - resend init. 723 */ 724 /* generate a new vtag and send init */ 725 LIST_REMOVE(stcb, sctp_asocs); 726 stcb->asoc.state &= ~SCTP_STATE_COOKIE_ECHOED; 727 stcb->asoc.state |= SCTP_STATE_COOKIE_WAIT; 728 sctp_stop_all_cookie_timers(stcb); 729 sctp_toss_old_cookies(stcb, &stcb->asoc); 730 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 731 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 732 /* 733 * put it in the bucket in the vtag hash of assoc's for the 734 * system 735 */ 736 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 737 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 738 return (1); 739 } 740 return (0); 741 } 742 743 static int 744 sctp_handle_nat_missing_state(struct sctp_tcb *stcb, 745 struct sctp_nets *net) 746 { 747 /* 748 * return 0 means we want you to proceed with the abort non-zero 749 * means no abort processing 750 */ 751 if (stcb->asoc.auth_supported == 0) { 752 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n"); 753 return (0); 754 } 755 sctp_asconf_send_nat_state_update(stcb, net); 756 return (1); 757 } 758 759 760 static void 761 sctp_handle_abort(struct sctp_abort_chunk *abort, 762 struct sctp_tcb *stcb, struct sctp_nets *net) 763 { 764 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 765 struct socket *so; 766 767 #endif 768 uint16_t len; 769 uint16_t error; 770 771 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n"); 772 if (stcb == NULL) 773 return; 774 775 len = ntohs(abort->ch.chunk_length); 776 if (len > sizeof(struct sctp_chunkhdr)) { 777 /* 778 * Need to check the cause codes for our two magic nat 779 * aborts which don't kill the assoc necessarily. 780 */ 781 struct sctp_missing_nat_state *natc; 782 783 natc = (struct sctp_missing_nat_state *)(abort + 1); 784 error = ntohs(natc->cause); 785 if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) { 786 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n", 787 abort->ch.chunk_flags); 788 if (sctp_handle_nat_colliding_state(stcb)) { 789 return; 790 } 791 } else if (error == SCTP_CAUSE_NAT_MISSING_STATE) { 792 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n", 793 abort->ch.chunk_flags); 794 if (sctp_handle_nat_missing_state(stcb, net)) { 795 return; 796 } 797 } 798 } else { 799 error = 0; 800 } 801 /* stop any receive timers */ 802 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net, 803 SCTP_FROM_SCTP_INPUT + SCTP_LOC_7); 804 /* notify user of the abort and clean up... */ 805 sctp_abort_notification(stcb, 1, error, abort, SCTP_SO_NOT_LOCKED); 806 /* free the tcb */ 807 SCTP_STAT_INCR_COUNTER32(sctps_aborted); 808 if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) || 809 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 810 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 811 } 812 #ifdef SCTP_ASOCLOG_OF_TSNS 813 sctp_print_out_track_log(stcb); 814 #endif 815 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 816 so = SCTP_INP_SO(stcb->sctp_ep); 817 atomic_add_int(&stcb->asoc.refcnt, 1); 818 SCTP_TCB_UNLOCK(stcb); 819 SCTP_SOCKET_LOCK(so, 1); 820 SCTP_TCB_LOCK(stcb); 821 atomic_subtract_int(&stcb->asoc.refcnt, 1); 822 #endif 823 stcb->asoc.state |= SCTP_STATE_WAS_ABORTED; 824 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 825 SCTP_FROM_SCTP_INPUT + SCTP_LOC_8); 826 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 827 SCTP_SOCKET_UNLOCK(so, 1); 828 #endif 829 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n"); 830 } 831 832 static void 833 sctp_start_net_timers(struct sctp_tcb *stcb) 834 { 835 uint32_t cnt_hb_sent; 836 struct sctp_nets *net; 837 838 cnt_hb_sent = 0; 839 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 840 /* 841 * For each network start: 1) A pmtu timer. 2) A HB timer 3) 842 * If the dest in unconfirmed send a hb as well if under 843 * max_hb_burst have been sent. 844 */ 845 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net); 846 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net); 847 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) && 848 (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) { 849 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 850 cnt_hb_sent++; 851 } 852 } 853 if (cnt_hb_sent) { 854 sctp_chunk_output(stcb->sctp_ep, stcb, 855 SCTP_OUTPUT_FROM_COOKIE_ACK, 856 SCTP_SO_NOT_LOCKED); 857 } 858 } 859 860 861 static void 862 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp, 863 struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag) 864 { 865 struct sctp_association *asoc; 866 int some_on_streamwheel; 867 868 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 869 struct socket *so; 870 871 #endif 872 873 SCTPDBG(SCTP_DEBUG_INPUT2, 874 "sctp_handle_shutdown: handling SHUTDOWN\n"); 875 if (stcb == NULL) 876 return; 877 asoc = &stcb->asoc; 878 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) || 879 (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) { 880 return; 881 } 882 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) { 883 /* Shutdown NOT the expected size */ 884 return; 885 } else { 886 sctp_update_acked(stcb, cp, abort_flag); 887 if (*abort_flag) { 888 return; 889 } 890 } 891 if (asoc->control_pdapi) { 892 /* 893 * With a normal shutdown we assume the end of last record. 894 */ 895 SCTP_INP_READ_LOCK(stcb->sctp_ep); 896 asoc->control_pdapi->end_added = 1; 897 asoc->control_pdapi->pdapi_aborted = 1; 898 asoc->control_pdapi = NULL; 899 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 900 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 901 so = SCTP_INP_SO(stcb->sctp_ep); 902 atomic_add_int(&stcb->asoc.refcnt, 1); 903 SCTP_TCB_UNLOCK(stcb); 904 SCTP_SOCKET_LOCK(so, 1); 905 SCTP_TCB_LOCK(stcb); 906 atomic_subtract_int(&stcb->asoc.refcnt, 1); 907 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 908 /* assoc was freed while we were unlocked */ 909 SCTP_SOCKET_UNLOCK(so, 1); 910 return; 911 } 912 #endif 913 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 914 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 915 SCTP_SOCKET_UNLOCK(so, 1); 916 #endif 917 } 918 /* goto SHUTDOWN_RECEIVED state to block new requests */ 919 if (stcb->sctp_socket) { 920 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) && 921 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) && 922 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) { 923 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_RECEIVED); 924 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 925 /* 926 * notify upper layer that peer has initiated a 927 * shutdown 928 */ 929 sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 930 931 /* reset time */ 932 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 933 } 934 } 935 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) { 936 /* 937 * stop the shutdown timer, since we WILL move to 938 * SHUTDOWN-ACK-SENT. 939 */ 940 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, 941 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9); 942 } 943 /* Now is there unsent data on a stream somewhere? */ 944 some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED); 945 946 if (!TAILQ_EMPTY(&asoc->send_queue) || 947 !TAILQ_EMPTY(&asoc->sent_queue) || 948 some_on_streamwheel) { 949 /* By returning we will push more data out */ 950 return; 951 } else { 952 /* no outstanding data to send, so move on... */ 953 /* send SHUTDOWN-ACK */ 954 /* move to SHUTDOWN-ACK-SENT state */ 955 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) || 956 (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 957 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 958 } 959 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT); 960 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 961 sctp_stop_timers_for_shutdown(stcb); 962 sctp_send_shutdown_ack(stcb, net); 963 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, 964 stcb, net); 965 } 966 } 967 968 static void 969 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED, 970 struct sctp_tcb *stcb, 971 struct sctp_nets *net) 972 { 973 struct sctp_association *asoc; 974 975 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 976 struct socket *so; 977 978 so = SCTP_INP_SO(stcb->sctp_ep); 979 #endif 980 SCTPDBG(SCTP_DEBUG_INPUT2, 981 "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n"); 982 if (stcb == NULL) 983 return; 984 985 asoc = &stcb->asoc; 986 /* process according to association state */ 987 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) || 988 (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) { 989 /* unexpected SHUTDOWN-ACK... do OOTB handling... */ 990 sctp_send_shutdown_complete(stcb, net, 1); 991 SCTP_TCB_UNLOCK(stcb); 992 return; 993 } 994 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) && 995 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) { 996 /* unexpected SHUTDOWN-ACK... so ignore... */ 997 SCTP_TCB_UNLOCK(stcb); 998 return; 999 } 1000 if (asoc->control_pdapi) { 1001 /* 1002 * With a normal shutdown we assume the end of last record. 1003 */ 1004 SCTP_INP_READ_LOCK(stcb->sctp_ep); 1005 asoc->control_pdapi->end_added = 1; 1006 asoc->control_pdapi->pdapi_aborted = 1; 1007 asoc->control_pdapi = NULL; 1008 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 1009 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1010 atomic_add_int(&stcb->asoc.refcnt, 1); 1011 SCTP_TCB_UNLOCK(stcb); 1012 SCTP_SOCKET_LOCK(so, 1); 1013 SCTP_TCB_LOCK(stcb); 1014 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1015 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1016 /* assoc was freed while we were unlocked */ 1017 SCTP_SOCKET_UNLOCK(so, 1); 1018 return; 1019 } 1020 #endif 1021 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 1022 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1023 SCTP_SOCKET_UNLOCK(so, 1); 1024 #endif 1025 } 1026 #ifdef INVARIANTS 1027 if (!TAILQ_EMPTY(&asoc->send_queue) || 1028 !TAILQ_EMPTY(&asoc->sent_queue) || 1029 !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 1030 panic("Queues are not empty when handling SHUTDOWN-ACK"); 1031 } 1032 #endif 1033 /* stop the timer */ 1034 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, 1035 SCTP_FROM_SCTP_INPUT + SCTP_LOC_10); 1036 /* send SHUTDOWN-COMPLETE */ 1037 sctp_send_shutdown_complete(stcb, net, 0); 1038 /* notify upper layer protocol */ 1039 if (stcb->sctp_socket) { 1040 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1041 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 1042 stcb->sctp_socket->so_snd.sb_cc = 0; 1043 } 1044 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 1045 } 1046 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 1047 /* free the TCB but first save off the ep */ 1048 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1049 atomic_add_int(&stcb->asoc.refcnt, 1); 1050 SCTP_TCB_UNLOCK(stcb); 1051 SCTP_SOCKET_LOCK(so, 1); 1052 SCTP_TCB_LOCK(stcb); 1053 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1054 #endif 1055 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1056 SCTP_FROM_SCTP_INPUT + SCTP_LOC_11); 1057 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1058 SCTP_SOCKET_UNLOCK(so, 1); 1059 #endif 1060 } 1061 1062 /* 1063 * Skip past the param header and then we will find the chunk that caused the 1064 * problem. There are two possiblities ASCONF or FWD-TSN other than that and 1065 * our peer must be broken. 1066 */ 1067 static void 1068 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr, 1069 struct sctp_nets *net) 1070 { 1071 struct sctp_chunkhdr *chk; 1072 1073 chk = (struct sctp_chunkhdr *)((caddr_t)phdr + sizeof(*phdr)); 1074 switch (chk->chunk_type) { 1075 case SCTP_ASCONF_ACK: 1076 case SCTP_ASCONF: 1077 sctp_asconf_cleanup(stcb, net); 1078 break; 1079 case SCTP_FORWARD_CUM_TSN: 1080 stcb->asoc.prsctp_supported = 0; 1081 break; 1082 default: 1083 SCTPDBG(SCTP_DEBUG_INPUT2, 1084 "Peer does not support chunk type %d(%x)??\n", 1085 chk->chunk_type, (uint32_t) chk->chunk_type); 1086 break; 1087 } 1088 } 1089 1090 /* 1091 * Skip past the param header and then we will find the param that caused the 1092 * problem. There are a number of param's in a ASCONF OR the prsctp param 1093 * these will turn of specific features. 1094 * XXX: Is this the right thing to do? 1095 */ 1096 static void 1097 sctp_process_unrecog_param(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr) 1098 { 1099 struct sctp_paramhdr *pbad; 1100 1101 pbad = phdr + 1; 1102 switch (ntohs(pbad->param_type)) { 1103 /* pr-sctp draft */ 1104 case SCTP_PRSCTP_SUPPORTED: 1105 stcb->asoc.prsctp_supported = 0; 1106 break; 1107 case SCTP_SUPPORTED_CHUNK_EXT: 1108 break; 1109 /* draft-ietf-tsvwg-addip-sctp */ 1110 case SCTP_HAS_NAT_SUPPORT: 1111 stcb->asoc.peer_supports_nat = 0; 1112 break; 1113 case SCTP_ADD_IP_ADDRESS: 1114 case SCTP_DEL_IP_ADDRESS: 1115 case SCTP_SET_PRIM_ADDR: 1116 stcb->asoc.asconf_supported = 0; 1117 break; 1118 case SCTP_SUCCESS_REPORT: 1119 case SCTP_ERROR_CAUSE_IND: 1120 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n"); 1121 SCTPDBG(SCTP_DEBUG_INPUT2, 1122 "Turning off ASCONF to this strange peer\n"); 1123 stcb->asoc.asconf_supported = 0; 1124 break; 1125 default: 1126 SCTPDBG(SCTP_DEBUG_INPUT2, 1127 "Peer does not support param type %d(%x)??\n", 1128 pbad->param_type, (uint32_t) pbad->param_type); 1129 break; 1130 } 1131 } 1132 1133 static int 1134 sctp_handle_error(struct sctp_chunkhdr *ch, 1135 struct sctp_tcb *stcb, struct sctp_nets *net) 1136 { 1137 int chklen; 1138 struct sctp_paramhdr *phdr; 1139 uint16_t error, error_type; 1140 uint16_t error_len; 1141 struct sctp_association *asoc; 1142 int adjust; 1143 1144 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1145 struct socket *so; 1146 1147 #endif 1148 1149 /* parse through all of the errors and process */ 1150 asoc = &stcb->asoc; 1151 phdr = (struct sctp_paramhdr *)((caddr_t)ch + 1152 sizeof(struct sctp_chunkhdr)); 1153 chklen = ntohs(ch->chunk_length) - sizeof(struct sctp_chunkhdr); 1154 error = 0; 1155 while ((size_t)chklen >= sizeof(struct sctp_paramhdr)) { 1156 /* Process an Error Cause */ 1157 error_type = ntohs(phdr->param_type); 1158 error_len = ntohs(phdr->param_length); 1159 if ((error_len > chklen) || (error_len == 0)) { 1160 /* invalid param length for this param */ 1161 SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in error param- chunk left:%d errorlen:%d\n", 1162 chklen, error_len); 1163 return (0); 1164 } 1165 if (error == 0) { 1166 /* report the first error cause */ 1167 error = error_type; 1168 } 1169 switch (error_type) { 1170 case SCTP_CAUSE_INVALID_STREAM: 1171 case SCTP_CAUSE_MISSING_PARAM: 1172 case SCTP_CAUSE_INVALID_PARAM: 1173 case SCTP_CAUSE_NO_USER_DATA: 1174 SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %d back? We have a bug :/ (or do they?)\n", 1175 error_type); 1176 break; 1177 case SCTP_CAUSE_NAT_COLLIDING_STATE: 1178 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n", 1179 ch->chunk_flags); 1180 if (sctp_handle_nat_colliding_state(stcb)) { 1181 return (0); 1182 } 1183 break; 1184 case SCTP_CAUSE_NAT_MISSING_STATE: 1185 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n", 1186 ch->chunk_flags); 1187 if (sctp_handle_nat_missing_state(stcb, net)) { 1188 return (0); 1189 } 1190 break; 1191 case SCTP_CAUSE_STALE_COOKIE: 1192 /* 1193 * We only act if we have echoed a cookie and are 1194 * waiting. 1195 */ 1196 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) { 1197 int *p; 1198 1199 p = (int *)((caddr_t)phdr + sizeof(*phdr)); 1200 /* Save the time doubled */ 1201 asoc->cookie_preserve_req = ntohl(*p) << 1; 1202 asoc->stale_cookie_count++; 1203 if (asoc->stale_cookie_count > 1204 asoc->max_init_times) { 1205 sctp_abort_notification(stcb, 0, 0, NULL, SCTP_SO_NOT_LOCKED); 1206 /* now free the asoc */ 1207 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1208 so = SCTP_INP_SO(stcb->sctp_ep); 1209 atomic_add_int(&stcb->asoc.refcnt, 1); 1210 SCTP_TCB_UNLOCK(stcb); 1211 SCTP_SOCKET_LOCK(so, 1); 1212 SCTP_TCB_LOCK(stcb); 1213 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1214 #endif 1215 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1216 SCTP_FROM_SCTP_INPUT + SCTP_LOC_12); 1217 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1218 SCTP_SOCKET_UNLOCK(so, 1); 1219 #endif 1220 return (-1); 1221 } 1222 /* blast back to INIT state */ 1223 sctp_toss_old_cookies(stcb, &stcb->asoc); 1224 asoc->state &= ~SCTP_STATE_COOKIE_ECHOED; 1225 asoc->state |= SCTP_STATE_COOKIE_WAIT; 1226 sctp_stop_all_cookie_timers(stcb); 1227 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 1228 } 1229 break; 1230 case SCTP_CAUSE_UNRESOLVABLE_ADDR: 1231 /* 1232 * Nothing we can do here, we don't do hostname 1233 * addresses so if the peer does not like my IPv6 1234 * (or IPv4 for that matter) it does not matter. If 1235 * they don't support that type of address, they can 1236 * NOT possibly get that packet type... i.e. with no 1237 * IPv6 you can't recieve a IPv6 packet. so we can 1238 * safely ignore this one. If we ever added support 1239 * for HOSTNAME Addresses, then we would need to do 1240 * something here. 1241 */ 1242 break; 1243 case SCTP_CAUSE_UNRECOG_CHUNK: 1244 sctp_process_unrecog_chunk(stcb, phdr, net); 1245 break; 1246 case SCTP_CAUSE_UNRECOG_PARAM: 1247 sctp_process_unrecog_param(stcb, phdr); 1248 break; 1249 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN: 1250 /* 1251 * We ignore this since the timer will drive out a 1252 * new cookie anyway and there timer will drive us 1253 * to send a SHUTDOWN_COMPLETE. We can't send one 1254 * here since we don't have their tag. 1255 */ 1256 break; 1257 case SCTP_CAUSE_DELETING_LAST_ADDR: 1258 case SCTP_CAUSE_RESOURCE_SHORTAGE: 1259 case SCTP_CAUSE_DELETING_SRC_ADDR: 1260 /* 1261 * We should NOT get these here, but in a 1262 * ASCONF-ACK. 1263 */ 1264 SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a Operational Error?<%d>?\n", 1265 error_type); 1266 break; 1267 case SCTP_CAUSE_OUT_OF_RESC: 1268 /* 1269 * And what, pray tell do we do with the fact that 1270 * the peer is out of resources? Not really sure we 1271 * could do anything but abort. I suspect this 1272 * should have came WITH an abort instead of in a 1273 * OP-ERROR. 1274 */ 1275 break; 1276 default: 1277 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown error type = 0x%xh\n", 1278 error_type); 1279 break; 1280 } 1281 adjust = SCTP_SIZE32(error_len); 1282 chklen -= adjust; 1283 phdr = (struct sctp_paramhdr *)((caddr_t)phdr + adjust); 1284 } 1285 sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, error, ch, SCTP_SO_NOT_LOCKED); 1286 return (0); 1287 } 1288 1289 static int 1290 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset, 1291 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 1292 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 1293 struct sctp_nets *net, int *abort_no_unlock, 1294 uint8_t mflowtype, uint32_t mflowid, 1295 uint32_t vrf_id) 1296 { 1297 struct sctp_init_ack *init_ack; 1298 struct mbuf *op_err; 1299 1300 SCTPDBG(SCTP_DEBUG_INPUT2, 1301 "sctp_handle_init_ack: handling INIT-ACK\n"); 1302 1303 if (stcb == NULL) { 1304 SCTPDBG(SCTP_DEBUG_INPUT2, 1305 "sctp_handle_init_ack: TCB is null\n"); 1306 return (-1); 1307 } 1308 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) { 1309 /* Invalid length */ 1310 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1311 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1312 src, dst, sh, op_err, 1313 mflowtype, mflowid, 1314 vrf_id, net->port); 1315 *abort_no_unlock = 1; 1316 return (-1); 1317 } 1318 init_ack = &cp->init; 1319 /* validate parameters */ 1320 if (init_ack->initiate_tag == 0) { 1321 /* protocol error... send an abort */ 1322 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1323 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1324 src, dst, sh, op_err, 1325 mflowtype, mflowid, 1326 vrf_id, net->port); 1327 *abort_no_unlock = 1; 1328 return (-1); 1329 } 1330 if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) { 1331 /* protocol error... send an abort */ 1332 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1333 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1334 src, dst, sh, op_err, 1335 mflowtype, mflowid, 1336 vrf_id, net->port); 1337 *abort_no_unlock = 1; 1338 return (-1); 1339 } 1340 if (init_ack->num_inbound_streams == 0) { 1341 /* protocol error... send an abort */ 1342 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1343 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1344 src, dst, sh, op_err, 1345 mflowtype, mflowid, 1346 vrf_id, net->port); 1347 *abort_no_unlock = 1; 1348 return (-1); 1349 } 1350 if (init_ack->num_outbound_streams == 0) { 1351 /* protocol error... send an abort */ 1352 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1353 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1354 src, dst, sh, op_err, 1355 mflowtype, mflowid, 1356 vrf_id, net->port); 1357 *abort_no_unlock = 1; 1358 return (-1); 1359 } 1360 /* process according to association state... */ 1361 switch (stcb->asoc.state & SCTP_STATE_MASK) { 1362 case SCTP_STATE_COOKIE_WAIT: 1363 /* this is the expected state for this chunk */ 1364 /* process the INIT-ACK parameters */ 1365 if (stcb->asoc.primary_destination->dest_state & 1366 SCTP_ADDR_UNCONFIRMED) { 1367 /* 1368 * The primary is where we sent the INIT, we can 1369 * always consider it confirmed when the INIT-ACK is 1370 * returned. Do this before we load addresses 1371 * though. 1372 */ 1373 stcb->asoc.primary_destination->dest_state &= 1374 ~SCTP_ADDR_UNCONFIRMED; 1375 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 1376 stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED); 1377 } 1378 if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb, 1379 net, abort_no_unlock, 1380 mflowtype, mflowid, 1381 vrf_id) < 0) { 1382 /* error in parsing parameters */ 1383 return (-1); 1384 } 1385 /* update our state */ 1386 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n"); 1387 SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_ECHOED); 1388 1389 /* reset the RTO calc */ 1390 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 1391 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 1392 stcb->asoc.overall_error_count, 1393 0, 1394 SCTP_FROM_SCTP_INPUT, 1395 __LINE__); 1396 } 1397 stcb->asoc.overall_error_count = 0; 1398 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 1399 /* 1400 * collapse the init timer back in case of a exponential 1401 * backoff 1402 */ 1403 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep, 1404 stcb, net); 1405 /* 1406 * the send at the end of the inbound data processing will 1407 * cause the cookie to be sent 1408 */ 1409 break; 1410 case SCTP_STATE_SHUTDOWN_SENT: 1411 /* incorrect state... discard */ 1412 break; 1413 case SCTP_STATE_COOKIE_ECHOED: 1414 /* incorrect state... discard */ 1415 break; 1416 case SCTP_STATE_OPEN: 1417 /* incorrect state... discard */ 1418 break; 1419 case SCTP_STATE_EMPTY: 1420 case SCTP_STATE_INUSE: 1421 default: 1422 /* incorrect state... discard */ 1423 return (-1); 1424 break; 1425 } 1426 SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n"); 1427 return (0); 1428 } 1429 1430 static struct sctp_tcb * 1431 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1432 struct sockaddr *src, struct sockaddr *dst, 1433 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1434 struct sctp_inpcb *inp, struct sctp_nets **netp, 1435 struct sockaddr *init_src, int *notification, 1436 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1437 uint8_t mflowtype, uint32_t mflowid, 1438 uint32_t vrf_id, uint16_t port); 1439 1440 1441 /* 1442 * handle a state cookie for an existing association m: input packet mbuf 1443 * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a 1444 * "split" mbuf and the cookie signature does not exist offset: offset into 1445 * mbuf to the cookie-echo chunk 1446 */ 1447 static struct sctp_tcb * 1448 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset, 1449 struct sockaddr *src, struct sockaddr *dst, 1450 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1451 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp, 1452 struct sockaddr *init_src, int *notification, 1453 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1454 uint8_t mflowtype, uint32_t mflowid, 1455 uint32_t vrf_id, uint16_t port) 1456 { 1457 struct sctp_association *asoc; 1458 struct sctp_init_chunk *init_cp, init_buf; 1459 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1460 struct sctp_nets *net; 1461 struct mbuf *op_err; 1462 int init_offset, initack_offset, i; 1463 int retval; 1464 int spec_flag = 0; 1465 uint32_t how_indx; 1466 1467 #if defined(SCTP_DETAILED_STR_STATS) 1468 int j; 1469 1470 #endif 1471 1472 net = *netp; 1473 /* I know that the TCB is non-NULL from the caller */ 1474 asoc = &stcb->asoc; 1475 for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) { 1476 if (asoc->cookie_how[how_indx] == 0) 1477 break; 1478 } 1479 if (how_indx < sizeof(asoc->cookie_how)) { 1480 asoc->cookie_how[how_indx] = 1; 1481 } 1482 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 1483 /* SHUTDOWN came in after sending INIT-ACK */ 1484 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination); 1485 op_err = sctp_generate_cause(SCTP_CAUSE_COOKIE_IN_SHUTDOWN, ""); 1486 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 1487 mflowtype, mflowid, inp->fibnum, 1488 vrf_id, net->port); 1489 if (how_indx < sizeof(asoc->cookie_how)) 1490 asoc->cookie_how[how_indx] = 2; 1491 return (NULL); 1492 } 1493 /* 1494 * find and validate the INIT chunk in the cookie (peer's info) the 1495 * INIT should start after the cookie-echo header struct (chunk 1496 * header, state cookie header struct) 1497 */ 1498 init_offset = offset += sizeof(struct sctp_cookie_echo_chunk); 1499 1500 init_cp = (struct sctp_init_chunk *) 1501 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 1502 (uint8_t *) & init_buf); 1503 if (init_cp == NULL) { 1504 /* could not pull a INIT chunk in cookie */ 1505 return (NULL); 1506 } 1507 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 1508 return (NULL); 1509 } 1510 /* 1511 * find and validate the INIT-ACK chunk in the cookie (my info) the 1512 * INIT-ACK follows the INIT chunk 1513 */ 1514 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 1515 initack_cp = (struct sctp_init_ack_chunk *) 1516 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 1517 (uint8_t *) & initack_buf); 1518 if (initack_cp == NULL) { 1519 /* could not pull INIT-ACK chunk in cookie */ 1520 return (NULL); 1521 } 1522 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 1523 return (NULL); 1524 } 1525 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1526 (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) { 1527 /* 1528 * case D in Section 5.2.4 Table 2: MMAA process accordingly 1529 * to get into the OPEN state 1530 */ 1531 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1532 /*- 1533 * Opps, this means that we somehow generated two vtag's 1534 * the same. I.e. we did: 1535 * Us Peer 1536 * <---INIT(tag=a)------ 1537 * ----INIT-ACK(tag=t)--> 1538 * ----INIT(tag=t)------> *1 1539 * <---INIT-ACK(tag=a)--- 1540 * <----CE(tag=t)------------- *2 1541 * 1542 * At point *1 we should be generating a different 1543 * tag t'. Which means we would throw away the CE and send 1544 * ours instead. Basically this is case C (throw away side). 1545 */ 1546 if (how_indx < sizeof(asoc->cookie_how)) 1547 asoc->cookie_how[how_indx] = 17; 1548 return (NULL); 1549 1550 } 1551 switch (SCTP_GET_STATE(asoc)) { 1552 case SCTP_STATE_COOKIE_WAIT: 1553 case SCTP_STATE_COOKIE_ECHOED: 1554 /* 1555 * INIT was sent but got a COOKIE_ECHO with the 1556 * correct tags... just accept it...but we must 1557 * process the init so that we can make sure we have 1558 * the right seq no's. 1559 */ 1560 /* First we must process the INIT !! */ 1561 retval = sctp_process_init(init_cp, stcb); 1562 if (retval < 0) { 1563 if (how_indx < sizeof(asoc->cookie_how)) 1564 asoc->cookie_how[how_indx] = 3; 1565 return (NULL); 1566 } 1567 /* we have already processed the INIT so no problem */ 1568 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, 1569 stcb, net, 1570 SCTP_FROM_SCTP_INPUT + SCTP_LOC_13); 1571 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, 1572 stcb, net, 1573 SCTP_FROM_SCTP_INPUT + SCTP_LOC_14); 1574 /* update current state */ 1575 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) 1576 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1577 else 1578 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1579 1580 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1581 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1582 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1583 stcb->sctp_ep, stcb, asoc->primary_destination); 1584 } 1585 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1586 sctp_stop_all_cookie_timers(stcb); 1587 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1588 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1589 (inp->sctp_socket->so_qlimit == 0) 1590 ) { 1591 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1592 struct socket *so; 1593 1594 #endif 1595 /* 1596 * Here is where collision would go if we 1597 * did a connect() and instead got a 1598 * init/init-ack/cookie done before the 1599 * init-ack came back.. 1600 */ 1601 stcb->sctp_ep->sctp_flags |= 1602 SCTP_PCB_FLAGS_CONNECTED; 1603 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1604 so = SCTP_INP_SO(stcb->sctp_ep); 1605 atomic_add_int(&stcb->asoc.refcnt, 1); 1606 SCTP_TCB_UNLOCK(stcb); 1607 SCTP_SOCKET_LOCK(so, 1); 1608 SCTP_TCB_LOCK(stcb); 1609 atomic_add_int(&stcb->asoc.refcnt, -1); 1610 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1611 SCTP_SOCKET_UNLOCK(so, 1); 1612 return (NULL); 1613 } 1614 #endif 1615 soisconnected(stcb->sctp_socket); 1616 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1617 SCTP_SOCKET_UNLOCK(so, 1); 1618 #endif 1619 } 1620 /* notify upper layer */ 1621 *notification = SCTP_NOTIFY_ASSOC_UP; 1622 /* 1623 * since we did not send a HB make sure we don't 1624 * double things 1625 */ 1626 net->hb_responded = 1; 1627 net->RTO = sctp_calculate_rto(stcb, asoc, net, 1628 &cookie->time_entered, 1629 sctp_align_unsafe_makecopy, 1630 SCTP_RTT_FROM_NON_DATA); 1631 1632 if (stcb->asoc.sctp_autoclose_ticks && 1633 (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) { 1634 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 1635 inp, stcb, NULL); 1636 } 1637 break; 1638 default: 1639 /* 1640 * we're in the OPEN state (or beyond), so peer must 1641 * have simply lost the COOKIE-ACK 1642 */ 1643 break; 1644 } /* end switch */ 1645 sctp_stop_all_cookie_timers(stcb); 1646 /* 1647 * We ignore the return code here.. not sure if we should 1648 * somehow abort.. but we do have an existing asoc. This 1649 * really should not fail. 1650 */ 1651 if (sctp_load_addresses_from_init(stcb, m, 1652 init_offset + sizeof(struct sctp_init_chunk), 1653 initack_offset, src, dst, init_src)) { 1654 if (how_indx < sizeof(asoc->cookie_how)) 1655 asoc->cookie_how[how_indx] = 4; 1656 return (NULL); 1657 } 1658 /* respond with a COOKIE-ACK */ 1659 sctp_toss_old_cookies(stcb, asoc); 1660 sctp_send_cookie_ack(stcb); 1661 if (how_indx < sizeof(asoc->cookie_how)) 1662 asoc->cookie_how[how_indx] = 5; 1663 return (stcb); 1664 } 1665 if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1666 ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag && 1667 cookie->tie_tag_my_vtag == 0 && 1668 cookie->tie_tag_peer_vtag == 0) { 1669 /* 1670 * case C in Section 5.2.4 Table 2: XMOO silently discard 1671 */ 1672 if (how_indx < sizeof(asoc->cookie_how)) 1673 asoc->cookie_how[how_indx] = 6; 1674 return (NULL); 1675 } 1676 /* 1677 * If nat support, and the below and stcb is established, send back 1678 * a ABORT(colliding state) if we are established. 1679 */ 1680 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) && 1681 (asoc->peer_supports_nat) && 1682 ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1683 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1684 (asoc->peer_vtag == 0)))) { 1685 /* 1686 * Special case - Peer's support nat. We may have two init's 1687 * that we gave out the same tag on since one was not 1688 * established.. i.e. we get INIT from host-1 behind the nat 1689 * and we respond tag-a, we get a INIT from host-2 behind 1690 * the nat and we get tag-a again. Then we bring up host-1 1691 * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1). 1692 * Now we have colliding state. We must send an abort here 1693 * with colliding state indication. 1694 */ 1695 op_err = sctp_generate_cause(SCTP_CAUSE_NAT_COLLIDING_STATE, ""); 1696 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err, 1697 mflowtype, mflowid, inp->fibnum, 1698 vrf_id, port); 1699 return (NULL); 1700 } 1701 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1702 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1703 (asoc->peer_vtag == 0))) { 1704 /* 1705 * case B in Section 5.2.4 Table 2: MXAA or MOAA my info 1706 * should be ok, re-accept peer info 1707 */ 1708 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1709 /* 1710 * Extension of case C. If we hit this, then the 1711 * random number generator returned the same vtag 1712 * when we first sent our INIT-ACK and when we later 1713 * sent our INIT. The side with the seq numbers that 1714 * are different will be the one that normnally 1715 * would have hit case C. This in effect "extends" 1716 * our vtags in this collision case to be 64 bits. 1717 * The same collision could occur aka you get both 1718 * vtag and seq number the same twice in a row.. but 1719 * is much less likely. If it did happen then we 1720 * would proceed through and bring up the assoc.. we 1721 * may end up with the wrong stream setup however.. 1722 * which would be bad.. but there is no way to 1723 * tell.. until we send on a stream that does not 1724 * exist :-) 1725 */ 1726 if (how_indx < sizeof(asoc->cookie_how)) 1727 asoc->cookie_how[how_indx] = 7; 1728 1729 return (NULL); 1730 } 1731 if (how_indx < sizeof(asoc->cookie_how)) 1732 asoc->cookie_how[how_indx] = 8; 1733 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, 1734 SCTP_FROM_SCTP_INPUT + SCTP_LOC_15); 1735 sctp_stop_all_cookie_timers(stcb); 1736 /* 1737 * since we did not send a HB make sure we don't double 1738 * things 1739 */ 1740 net->hb_responded = 1; 1741 if (stcb->asoc.sctp_autoclose_ticks && 1742 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 1743 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, 1744 NULL); 1745 } 1746 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1747 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 1748 1749 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) { 1750 /* 1751 * Ok the peer probably discarded our data (if we 1752 * echoed a cookie+data). So anything on the 1753 * sent_queue should be marked for retransmit, we 1754 * may not get something to kick us so it COULD 1755 * still take a timeout to move these.. but it can't 1756 * hurt to mark them. 1757 */ 1758 struct sctp_tmit_chunk *chk; 1759 1760 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 1761 if (chk->sent < SCTP_DATAGRAM_RESEND) { 1762 chk->sent = SCTP_DATAGRAM_RESEND; 1763 sctp_flight_size_decrease(chk); 1764 sctp_total_flight_decrease(stcb, chk); 1765 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 1766 spec_flag++; 1767 } 1768 } 1769 1770 } 1771 /* process the INIT info (peer's info) */ 1772 retval = sctp_process_init(init_cp, stcb); 1773 if (retval < 0) { 1774 if (how_indx < sizeof(asoc->cookie_how)) 1775 asoc->cookie_how[how_indx] = 9; 1776 return (NULL); 1777 } 1778 if (sctp_load_addresses_from_init(stcb, m, 1779 init_offset + sizeof(struct sctp_init_chunk), 1780 initack_offset, src, dst, init_src)) { 1781 if (how_indx < sizeof(asoc->cookie_how)) 1782 asoc->cookie_how[how_indx] = 10; 1783 return (NULL); 1784 } 1785 if ((asoc->state & SCTP_STATE_COOKIE_WAIT) || 1786 (asoc->state & SCTP_STATE_COOKIE_ECHOED)) { 1787 *notification = SCTP_NOTIFY_ASSOC_UP; 1788 1789 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1790 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1791 (inp->sctp_socket->so_qlimit == 0)) { 1792 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1793 struct socket *so; 1794 1795 #endif 1796 stcb->sctp_ep->sctp_flags |= 1797 SCTP_PCB_FLAGS_CONNECTED; 1798 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1799 so = SCTP_INP_SO(stcb->sctp_ep); 1800 atomic_add_int(&stcb->asoc.refcnt, 1); 1801 SCTP_TCB_UNLOCK(stcb); 1802 SCTP_SOCKET_LOCK(so, 1); 1803 SCTP_TCB_LOCK(stcb); 1804 atomic_add_int(&stcb->asoc.refcnt, -1); 1805 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1806 SCTP_SOCKET_UNLOCK(so, 1); 1807 return (NULL); 1808 } 1809 #endif 1810 soisconnected(stcb->sctp_socket); 1811 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1812 SCTP_SOCKET_UNLOCK(so, 1); 1813 #endif 1814 } 1815 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) 1816 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1817 else 1818 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1819 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1820 } else if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) { 1821 SCTP_STAT_INCR_COUNTER32(sctps_restartestab); 1822 } else { 1823 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1824 } 1825 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1826 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1827 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1828 stcb->sctp_ep, stcb, asoc->primary_destination); 1829 } 1830 sctp_stop_all_cookie_timers(stcb); 1831 sctp_toss_old_cookies(stcb, asoc); 1832 sctp_send_cookie_ack(stcb); 1833 if (spec_flag) { 1834 /* 1835 * only if we have retrans set do we do this. What 1836 * this call does is get only the COOKIE-ACK out and 1837 * then when we return the normal call to 1838 * sctp_chunk_output will get the retrans out behind 1839 * this. 1840 */ 1841 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED); 1842 } 1843 if (how_indx < sizeof(asoc->cookie_how)) 1844 asoc->cookie_how[how_indx] = 11; 1845 1846 return (stcb); 1847 } 1848 if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1849 ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) && 1850 cookie->tie_tag_my_vtag == asoc->my_vtag_nonce && 1851 cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce && 1852 cookie->tie_tag_peer_vtag != 0) { 1853 struct sctpasochead *head; 1854 1855 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1856 struct socket *so; 1857 1858 #endif 1859 1860 if (asoc->peer_supports_nat) { 1861 /* 1862 * This is a gross gross hack. Just call the 1863 * cookie_new code since we are allowing a duplicate 1864 * association. I hope this works... 1865 */ 1866 return (sctp_process_cookie_new(m, iphlen, offset, src, dst, 1867 sh, cookie, cookie_len, 1868 inp, netp, init_src, notification, 1869 auth_skipped, auth_offset, auth_len, 1870 mflowtype, mflowid, 1871 vrf_id, port)); 1872 } 1873 /* 1874 * case A in Section 5.2.4 Table 2: XXMM (peer restarted) 1875 */ 1876 /* temp code */ 1877 if (how_indx < sizeof(asoc->cookie_how)) 1878 asoc->cookie_how[how_indx] = 12; 1879 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, 1880 SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 1881 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, 1882 SCTP_FROM_SCTP_INPUT + SCTP_LOC_17); 1883 1884 /* notify upper layer */ 1885 *notification = SCTP_NOTIFY_ASSOC_RESTART; 1886 atomic_add_int(&stcb->asoc.refcnt, 1); 1887 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_OPEN) && 1888 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) && 1889 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) { 1890 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1891 } 1892 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) { 1893 SCTP_STAT_INCR_GAUGE32(sctps_restartestab); 1894 } else if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) { 1895 SCTP_STAT_INCR_GAUGE32(sctps_collisionestab); 1896 } 1897 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1898 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1899 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1900 stcb->sctp_ep, stcb, asoc->primary_destination); 1901 1902 } else if (!(asoc->state & SCTP_STATE_SHUTDOWN_SENT)) { 1903 /* move to OPEN state, if not in SHUTDOWN_SENT */ 1904 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1905 } 1906 asoc->pre_open_streams = 1907 ntohs(initack_cp->init.num_outbound_streams); 1908 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 1909 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 1910 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 1911 1912 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 1913 1914 asoc->str_reset_seq_in = asoc->init_seq_number; 1915 1916 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 1917 if (asoc->mapping_array) { 1918 memset(asoc->mapping_array, 0, 1919 asoc->mapping_array_size); 1920 } 1921 if (asoc->nr_mapping_array) { 1922 memset(asoc->nr_mapping_array, 0, 1923 asoc->mapping_array_size); 1924 } 1925 SCTP_TCB_UNLOCK(stcb); 1926 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1927 so = SCTP_INP_SO(stcb->sctp_ep); 1928 SCTP_SOCKET_LOCK(so, 1); 1929 #endif 1930 SCTP_INP_INFO_WLOCK(); 1931 SCTP_INP_WLOCK(stcb->sctp_ep); 1932 SCTP_TCB_LOCK(stcb); 1933 atomic_add_int(&stcb->asoc.refcnt, -1); 1934 /* send up all the data */ 1935 SCTP_TCB_SEND_LOCK(stcb); 1936 1937 sctp_report_all_outbound(stcb, 0, 1, SCTP_SO_LOCKED); 1938 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 1939 stcb->asoc.strmout[i].chunks_on_queues = 0; 1940 #if defined(SCTP_DETAILED_STR_STATS) 1941 for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) { 1942 asoc->strmout[i].abandoned_sent[j] = 0; 1943 asoc->strmout[i].abandoned_unsent[j] = 0; 1944 } 1945 #else 1946 asoc->strmout[i].abandoned_sent[0] = 0; 1947 asoc->strmout[i].abandoned_unsent[0] = 0; 1948 #endif 1949 stcb->asoc.strmout[i].stream_no = i; 1950 stcb->asoc.strmout[i].next_sequence_send = 0; 1951 stcb->asoc.strmout[i].last_msg_incomplete = 0; 1952 } 1953 /* process the INIT-ACK info (my info) */ 1954 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 1955 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1956 1957 /* pull from vtag hash */ 1958 LIST_REMOVE(stcb, sctp_asocs); 1959 /* re-insert to new vtag position */ 1960 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, 1961 SCTP_BASE_INFO(hashasocmark))]; 1962 /* 1963 * put it in the bucket in the vtag hash of assoc's for the 1964 * system 1965 */ 1966 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 1967 1968 SCTP_TCB_SEND_UNLOCK(stcb); 1969 SCTP_INP_WUNLOCK(stcb->sctp_ep); 1970 SCTP_INP_INFO_WUNLOCK(); 1971 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1972 SCTP_SOCKET_UNLOCK(so, 1); 1973 #endif 1974 asoc->total_flight = 0; 1975 asoc->total_flight_count = 0; 1976 /* process the INIT info (peer's info) */ 1977 retval = sctp_process_init(init_cp, stcb); 1978 if (retval < 0) { 1979 if (how_indx < sizeof(asoc->cookie_how)) 1980 asoc->cookie_how[how_indx] = 13; 1981 1982 return (NULL); 1983 } 1984 /* 1985 * since we did not send a HB make sure we don't double 1986 * things 1987 */ 1988 net->hb_responded = 1; 1989 1990 if (sctp_load_addresses_from_init(stcb, m, 1991 init_offset + sizeof(struct sctp_init_chunk), 1992 initack_offset, src, dst, init_src)) { 1993 if (how_indx < sizeof(asoc->cookie_how)) 1994 asoc->cookie_how[how_indx] = 14; 1995 1996 return (NULL); 1997 } 1998 /* respond with a COOKIE-ACK */ 1999 sctp_stop_all_cookie_timers(stcb); 2000 sctp_toss_old_cookies(stcb, asoc); 2001 sctp_send_cookie_ack(stcb); 2002 if (how_indx < sizeof(asoc->cookie_how)) 2003 asoc->cookie_how[how_indx] = 15; 2004 2005 return (stcb); 2006 } 2007 if (how_indx < sizeof(asoc->cookie_how)) 2008 asoc->cookie_how[how_indx] = 16; 2009 /* all other cases... */ 2010 return (NULL); 2011 } 2012 2013 2014 /* 2015 * handle a state cookie for a new association m: input packet mbuf chain-- 2016 * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf 2017 * and the cookie signature does not exist offset: offset into mbuf to the 2018 * cookie-echo chunk length: length of the cookie chunk to: where the init 2019 * was from returns a new TCB 2020 */ 2021 static struct sctp_tcb * 2022 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 2023 struct sockaddr *src, struct sockaddr *dst, 2024 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 2025 struct sctp_inpcb *inp, struct sctp_nets **netp, 2026 struct sockaddr *init_src, int *notification, 2027 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2028 uint8_t mflowtype, uint32_t mflowid, 2029 uint32_t vrf_id, uint16_t port) 2030 { 2031 struct sctp_tcb *stcb; 2032 struct sctp_init_chunk *init_cp, init_buf; 2033 struct sctp_init_ack_chunk *initack_cp, initack_buf; 2034 union sctp_sockstore store; 2035 struct sctp_association *asoc; 2036 int init_offset, initack_offset, initack_limit; 2037 int retval; 2038 int error = 0; 2039 uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE]; 2040 2041 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2042 struct socket *so; 2043 2044 so = SCTP_INP_SO(inp); 2045 #endif 2046 2047 /* 2048 * find and validate the INIT chunk in the cookie (peer's info) the 2049 * INIT should start after the cookie-echo header struct (chunk 2050 * header, state cookie header struct) 2051 */ 2052 init_offset = offset + sizeof(struct sctp_cookie_echo_chunk); 2053 init_cp = (struct sctp_init_chunk *) 2054 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 2055 (uint8_t *) & init_buf); 2056 if (init_cp == NULL) { 2057 /* could not pull a INIT chunk in cookie */ 2058 SCTPDBG(SCTP_DEBUG_INPUT1, 2059 "process_cookie_new: could not pull INIT chunk hdr\n"); 2060 return (NULL); 2061 } 2062 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 2063 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n"); 2064 return (NULL); 2065 } 2066 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 2067 /* 2068 * find and validate the INIT-ACK chunk in the cookie (my info) the 2069 * INIT-ACK follows the INIT chunk 2070 */ 2071 initack_cp = (struct sctp_init_ack_chunk *) 2072 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 2073 (uint8_t *) & initack_buf); 2074 if (initack_cp == NULL) { 2075 /* could not pull INIT-ACK chunk in cookie */ 2076 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n"); 2077 return (NULL); 2078 } 2079 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 2080 return (NULL); 2081 } 2082 /* 2083 * NOTE: We can't use the INIT_ACK's chk_length to determine the 2084 * "initack_limit" value. This is because the chk_length field 2085 * includes the length of the cookie, but the cookie is omitted when 2086 * the INIT and INIT_ACK are tacked onto the cookie... 2087 */ 2088 initack_limit = offset + cookie_len; 2089 2090 /* 2091 * now that we know the INIT/INIT-ACK are in place, create a new TCB 2092 * and popluate 2093 */ 2094 2095 /* 2096 * Here we do a trick, we set in NULL for the proc/thread argument. 2097 * We do this since in effect we only use the p argument when the 2098 * socket is unbound and we must do an implicit bind. Since we are 2099 * getting a cookie, we cannot be unbound. 2100 */ 2101 stcb = sctp_aloc_assoc(inp, init_src, &error, 2102 ntohl(initack_cp->init.initiate_tag), vrf_id, 2103 (struct thread *)NULL 2104 ); 2105 if (stcb == NULL) { 2106 struct mbuf *op_err; 2107 2108 /* memory problem? */ 2109 SCTPDBG(SCTP_DEBUG_INPUT1, 2110 "process_cookie_new: no room for another TCB!\n"); 2111 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2112 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2113 src, dst, sh, op_err, 2114 mflowtype, mflowid, 2115 vrf_id, port); 2116 return (NULL); 2117 } 2118 /* get the correct sctp_nets */ 2119 if (netp) 2120 *netp = sctp_findnet(stcb, init_src); 2121 2122 asoc = &stcb->asoc; 2123 /* get scope variables out of cookie */ 2124 asoc->scope.ipv4_local_scope = cookie->ipv4_scope; 2125 asoc->scope.site_scope = cookie->site_scope; 2126 asoc->scope.local_scope = cookie->local_scope; 2127 asoc->scope.loopback_scope = cookie->loopback_scope; 2128 2129 if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) || 2130 (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) { 2131 struct mbuf *op_err; 2132 2133 /* 2134 * Houston we have a problem. The EP changed while the 2135 * cookie was in flight. Only recourse is to abort the 2136 * association. 2137 */ 2138 atomic_add_int(&stcb->asoc.refcnt, 1); 2139 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2140 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2141 src, dst, sh, op_err, 2142 mflowtype, mflowid, 2143 vrf_id, port); 2144 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2145 SCTP_TCB_UNLOCK(stcb); 2146 SCTP_SOCKET_LOCK(so, 1); 2147 SCTP_TCB_LOCK(stcb); 2148 #endif 2149 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2150 SCTP_FROM_SCTP_INPUT + SCTP_LOC_18); 2151 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2152 SCTP_SOCKET_UNLOCK(so, 1); 2153 #endif 2154 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2155 return (NULL); 2156 } 2157 /* process the INIT-ACK info (my info) */ 2158 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 2159 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 2160 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 2161 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 2162 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 2163 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 2164 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 2165 asoc->str_reset_seq_in = asoc->init_seq_number; 2166 2167 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 2168 2169 /* process the INIT info (peer's info) */ 2170 if (netp) 2171 retval = sctp_process_init(init_cp, stcb); 2172 else 2173 retval = 0; 2174 if (retval < 0) { 2175 atomic_add_int(&stcb->asoc.refcnt, 1); 2176 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2177 SCTP_TCB_UNLOCK(stcb); 2178 SCTP_SOCKET_LOCK(so, 1); 2179 SCTP_TCB_LOCK(stcb); 2180 #endif 2181 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2182 SCTP_FROM_SCTP_INPUT + SCTP_LOC_19); 2183 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2184 SCTP_SOCKET_UNLOCK(so, 1); 2185 #endif 2186 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2187 return (NULL); 2188 } 2189 /* load all addresses */ 2190 if (sctp_load_addresses_from_init(stcb, m, 2191 init_offset + sizeof(struct sctp_init_chunk), initack_offset, 2192 src, dst, init_src)) { 2193 atomic_add_int(&stcb->asoc.refcnt, 1); 2194 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2195 SCTP_TCB_UNLOCK(stcb); 2196 SCTP_SOCKET_LOCK(so, 1); 2197 SCTP_TCB_LOCK(stcb); 2198 #endif 2199 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2200 SCTP_FROM_SCTP_INPUT + SCTP_LOC_20); 2201 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2202 SCTP_SOCKET_UNLOCK(so, 1); 2203 #endif 2204 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2205 return (NULL); 2206 } 2207 /* 2208 * verify any preceding AUTH chunk that was skipped 2209 */ 2210 /* pull the local authentication parameters from the cookie/init-ack */ 2211 sctp_auth_get_cookie_params(stcb, m, 2212 initack_offset + sizeof(struct sctp_init_ack_chunk), 2213 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk))); 2214 if (auth_skipped) { 2215 struct sctp_auth_chunk *auth; 2216 2217 auth = (struct sctp_auth_chunk *) 2218 sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf); 2219 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) { 2220 /* auth HMAC failed, dump the assoc and packet */ 2221 SCTPDBG(SCTP_DEBUG_AUTH1, 2222 "COOKIE-ECHO: AUTH failed\n"); 2223 atomic_add_int(&stcb->asoc.refcnt, 1); 2224 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2225 SCTP_TCB_UNLOCK(stcb); 2226 SCTP_SOCKET_LOCK(so, 1); 2227 SCTP_TCB_LOCK(stcb); 2228 #endif 2229 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2230 SCTP_FROM_SCTP_INPUT + SCTP_LOC_21); 2231 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2232 SCTP_SOCKET_UNLOCK(so, 1); 2233 #endif 2234 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2235 return (NULL); 2236 } else { 2237 /* remaining chunks checked... good to go */ 2238 stcb->asoc.authenticated = 1; 2239 } 2240 } 2241 /* update current state */ 2242 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2243 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 2244 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2245 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2246 stcb->sctp_ep, stcb, asoc->primary_destination); 2247 } 2248 sctp_stop_all_cookie_timers(stcb); 2249 SCTP_STAT_INCR_COUNTER32(sctps_passiveestab); 2250 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2251 2252 /* 2253 * if we're doing ASCONFs, check to see if we have any new local 2254 * addresses that need to get added to the peer (eg. addresses 2255 * changed while cookie echo in flight). This needs to be done 2256 * after we go to the OPEN state to do the correct asconf 2257 * processing. else, make sure we have the correct addresses in our 2258 * lists 2259 */ 2260 2261 /* warning, we re-use sin, sin6, sa_store here! */ 2262 /* pull in local_address (our "from" address) */ 2263 switch (cookie->laddr_type) { 2264 #ifdef INET 2265 case SCTP_IPV4_ADDRESS: 2266 /* source addr is IPv4 */ 2267 memset(&store.sin, 0, sizeof(struct sockaddr_in)); 2268 store.sin.sin_family = AF_INET; 2269 store.sin.sin_len = sizeof(struct sockaddr_in); 2270 store.sin.sin_addr.s_addr = cookie->laddress[0]; 2271 break; 2272 #endif 2273 #ifdef INET6 2274 case SCTP_IPV6_ADDRESS: 2275 /* source addr is IPv6 */ 2276 memset(&store.sin6, 0, sizeof(struct sockaddr_in6)); 2277 store.sin6.sin6_family = AF_INET6; 2278 store.sin6.sin6_len = sizeof(struct sockaddr_in6); 2279 store.sin6.sin6_scope_id = cookie->scope_id; 2280 memcpy(&store.sin6.sin6_addr, cookie->laddress, sizeof(struct in6_addr)); 2281 break; 2282 #endif 2283 default: 2284 atomic_add_int(&stcb->asoc.refcnt, 1); 2285 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2286 SCTP_TCB_UNLOCK(stcb); 2287 SCTP_SOCKET_LOCK(so, 1); 2288 SCTP_TCB_LOCK(stcb); 2289 #endif 2290 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2291 SCTP_FROM_SCTP_INPUT + SCTP_LOC_22); 2292 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2293 SCTP_SOCKET_UNLOCK(so, 1); 2294 #endif 2295 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2296 return (NULL); 2297 } 2298 2299 /* set up to notify upper layer */ 2300 *notification = SCTP_NOTIFY_ASSOC_UP; 2301 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2302 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 2303 (inp->sctp_socket->so_qlimit == 0)) { 2304 /* 2305 * This is an endpoint that called connect() how it got a 2306 * cookie that is NEW is a bit of a mystery. It must be that 2307 * the INIT was sent, but before it got there.. a complete 2308 * INIT/INIT-ACK/COOKIE arrived. But of course then it 2309 * should have went to the other code.. not here.. oh well.. 2310 * a bit of protection is worth having.. 2311 */ 2312 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2313 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2314 atomic_add_int(&stcb->asoc.refcnt, 1); 2315 SCTP_TCB_UNLOCK(stcb); 2316 SCTP_SOCKET_LOCK(so, 1); 2317 SCTP_TCB_LOCK(stcb); 2318 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2319 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2320 SCTP_SOCKET_UNLOCK(so, 1); 2321 return (NULL); 2322 } 2323 #endif 2324 soisconnected(stcb->sctp_socket); 2325 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2326 SCTP_SOCKET_UNLOCK(so, 1); 2327 #endif 2328 } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 2329 (inp->sctp_socket->so_qlimit)) { 2330 /* 2331 * We don't want to do anything with this one. Since it is 2332 * the listening guy. The timer will get started for 2333 * accepted connections in the caller. 2334 */ 2335 ; 2336 } 2337 /* since we did not send a HB make sure we don't double things */ 2338 if ((netp) && (*netp)) 2339 (*netp)->hb_responded = 1; 2340 2341 if (stcb->asoc.sctp_autoclose_ticks && 2342 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2343 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL); 2344 } 2345 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 2346 if ((netp) && (*netp)) { 2347 /* calculate the RTT and set the encaps port */ 2348 (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp, 2349 &cookie->time_entered, sctp_align_unsafe_makecopy, 2350 SCTP_RTT_FROM_NON_DATA); 2351 (*netp)->port = port; 2352 } 2353 /* respond with a COOKIE-ACK */ 2354 sctp_send_cookie_ack(stcb); 2355 2356 /* 2357 * check the address lists for any ASCONFs that need to be sent 2358 * AFTER the cookie-ack is sent 2359 */ 2360 sctp_check_address_list(stcb, m, 2361 initack_offset + sizeof(struct sctp_init_ack_chunk), 2362 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)), 2363 &store.sa, cookie->local_scope, cookie->site_scope, 2364 cookie->ipv4_scope, cookie->loopback_scope); 2365 2366 2367 return (stcb); 2368 } 2369 2370 /* 2371 * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e 2372 * we NEED to make sure we are not already using the vtag. If so we 2373 * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit! 2374 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag, 2375 SCTP_BASE_INFO(hashasocmark))]; 2376 LIST_FOREACH(stcb, head, sctp_asocs) { 2377 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep)) { 2378 -- SEND ABORT - TRY AGAIN -- 2379 } 2380 } 2381 */ 2382 2383 /* 2384 * handles a COOKIE-ECHO message stcb: modified to either a new or left as 2385 * existing (non-NULL) TCB 2386 */ 2387 static struct mbuf * 2388 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset, 2389 struct sockaddr *src, struct sockaddr *dst, 2390 struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp, 2391 struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp, 2392 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2393 struct sctp_tcb **locked_tcb, 2394 uint8_t mflowtype, uint32_t mflowid, 2395 uint32_t vrf_id, uint16_t port) 2396 { 2397 struct sctp_state_cookie *cookie; 2398 struct sctp_tcb *l_stcb = *stcb; 2399 struct sctp_inpcb *l_inp; 2400 struct sockaddr *to; 2401 struct sctp_pcb *ep; 2402 struct mbuf *m_sig; 2403 uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE]; 2404 uint8_t *sig; 2405 uint8_t cookie_ok = 0; 2406 unsigned int sig_offset, cookie_offset; 2407 unsigned int cookie_len; 2408 struct timeval now; 2409 struct timeval time_expires; 2410 int notification = 0; 2411 struct sctp_nets *netl; 2412 int had_a_existing_tcb = 0; 2413 int send_int_conf = 0; 2414 2415 #ifdef INET 2416 struct sockaddr_in sin; 2417 2418 #endif 2419 #ifdef INET6 2420 struct sockaddr_in6 sin6; 2421 2422 #endif 2423 2424 SCTPDBG(SCTP_DEBUG_INPUT2, 2425 "sctp_handle_cookie: handling COOKIE-ECHO\n"); 2426 2427 if (inp_p == NULL) { 2428 return (NULL); 2429 } 2430 cookie = &cp->cookie; 2431 cookie_offset = offset + sizeof(struct sctp_chunkhdr); 2432 cookie_len = ntohs(cp->ch.chunk_length); 2433 2434 if ((cookie->peerport != sh->src_port) && 2435 (cookie->myport != sh->dest_port) && 2436 (cookie->my_vtag != sh->v_tag)) { 2437 /* 2438 * invalid ports or bad tag. Note that we always leave the 2439 * v_tag in the header in network order and when we stored 2440 * it in the my_vtag slot we also left it in network order. 2441 * This maintains the match even though it may be in the 2442 * opposite byte order of the machine :-> 2443 */ 2444 return (NULL); 2445 } 2446 if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) + 2447 sizeof(struct sctp_init_chunk) + 2448 sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) { 2449 /* cookie too small */ 2450 return (NULL); 2451 } 2452 /* 2453 * split off the signature into its own mbuf (since it should not be 2454 * calculated in the sctp_hmac_m() call). 2455 */ 2456 sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE; 2457 m_sig = m_split(m, sig_offset, M_NOWAIT); 2458 if (m_sig == NULL) { 2459 /* out of memory or ?? */ 2460 return (NULL); 2461 } 2462 #ifdef SCTP_MBUF_LOGGING 2463 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 2464 sctp_log_mbc(m_sig, SCTP_MBUF_SPLIT); 2465 } 2466 #endif 2467 2468 /* 2469 * compute the signature/digest for the cookie 2470 */ 2471 ep = &(*inp_p)->sctp_ep; 2472 l_inp = *inp_p; 2473 if (l_stcb) { 2474 SCTP_TCB_UNLOCK(l_stcb); 2475 } 2476 SCTP_INP_RLOCK(l_inp); 2477 if (l_stcb) { 2478 SCTP_TCB_LOCK(l_stcb); 2479 } 2480 /* which cookie is it? */ 2481 if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) && 2482 (ep->current_secret_number != ep->last_secret_number)) { 2483 /* it's the old cookie */ 2484 (void)sctp_hmac_m(SCTP_HMAC, 2485 (uint8_t *) ep->secret_key[(int)ep->last_secret_number], 2486 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2487 } else { 2488 /* it's the current cookie */ 2489 (void)sctp_hmac_m(SCTP_HMAC, 2490 (uint8_t *) ep->secret_key[(int)ep->current_secret_number], 2491 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2492 } 2493 /* get the signature */ 2494 SCTP_INP_RUNLOCK(l_inp); 2495 sig = (uint8_t *) sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *) & tmp_sig); 2496 if (sig == NULL) { 2497 /* couldn't find signature */ 2498 sctp_m_freem(m_sig); 2499 return (NULL); 2500 } 2501 /* compare the received digest with the computed digest */ 2502 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) { 2503 /* try the old cookie? */ 2504 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) && 2505 (ep->current_secret_number != ep->last_secret_number)) { 2506 /* compute digest with old */ 2507 (void)sctp_hmac_m(SCTP_HMAC, 2508 (uint8_t *) ep->secret_key[(int)ep->last_secret_number], 2509 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2510 /* compare */ 2511 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0) 2512 cookie_ok = 1; 2513 } 2514 } else { 2515 cookie_ok = 1; 2516 } 2517 2518 /* 2519 * Now before we continue we must reconstruct our mbuf so that 2520 * normal processing of any other chunks will work. 2521 */ 2522 { 2523 struct mbuf *m_at; 2524 2525 m_at = m; 2526 while (SCTP_BUF_NEXT(m_at) != NULL) { 2527 m_at = SCTP_BUF_NEXT(m_at); 2528 } 2529 SCTP_BUF_NEXT(m_at) = m_sig; 2530 } 2531 2532 if (cookie_ok == 0) { 2533 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n"); 2534 SCTPDBG(SCTP_DEBUG_INPUT2, 2535 "offset = %u, cookie_offset = %u, sig_offset = %u\n", 2536 (uint32_t) offset, cookie_offset, sig_offset); 2537 return (NULL); 2538 } 2539 /* 2540 * check the cookie timestamps to be sure it's not stale 2541 */ 2542 (void)SCTP_GETTIME_TIMEVAL(&now); 2543 /* Expire time is in Ticks, so we convert to seconds */ 2544 time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life); 2545 time_expires.tv_usec = cookie->time_entered.tv_usec; 2546 /* 2547 * TODO sctp_constants.h needs alternative time macros when _KERNEL 2548 * is undefined. 2549 */ 2550 if (timevalcmp(&now, &time_expires, >)) { 2551 /* cookie is stale! */ 2552 struct mbuf *op_err; 2553 struct sctp_stale_cookie_msg *scm; 2554 uint32_t tim; 2555 2556 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_stale_cookie_msg), 2557 0, M_NOWAIT, 1, MT_DATA); 2558 if (op_err == NULL) { 2559 /* FOOBAR */ 2560 return (NULL); 2561 } 2562 /* Set the len */ 2563 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_stale_cookie_msg); 2564 scm = mtod(op_err, struct sctp_stale_cookie_msg *); 2565 scm->ph.param_type = htons(SCTP_CAUSE_STALE_COOKIE); 2566 scm->ph.param_length = htons((sizeof(struct sctp_paramhdr) + 2567 (sizeof(uint32_t)))); 2568 /* seconds to usec */ 2569 tim = (now.tv_sec - time_expires.tv_sec) * 1000000; 2570 /* add in usec */ 2571 if (tim == 0) 2572 tim = now.tv_usec - cookie->time_entered.tv_usec; 2573 scm->time_usec = htonl(tim); 2574 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 2575 mflowtype, mflowid, l_inp->fibnum, 2576 vrf_id, port); 2577 return (NULL); 2578 } 2579 /* 2580 * Now we must see with the lookup address if we have an existing 2581 * asoc. This will only happen if we were in the COOKIE-WAIT state 2582 * and a INIT collided with us and somewhere the peer sent the 2583 * cookie on another address besides the single address our assoc 2584 * had for him. In this case we will have one of the tie-tags set at 2585 * least AND the address field in the cookie can be used to look it 2586 * up. 2587 */ 2588 to = NULL; 2589 switch (cookie->addr_type) { 2590 #ifdef INET6 2591 case SCTP_IPV6_ADDRESS: 2592 memset(&sin6, 0, sizeof(sin6)); 2593 sin6.sin6_family = AF_INET6; 2594 sin6.sin6_len = sizeof(sin6); 2595 sin6.sin6_port = sh->src_port; 2596 sin6.sin6_scope_id = cookie->scope_id; 2597 memcpy(&sin6.sin6_addr.s6_addr, cookie->address, 2598 sizeof(sin6.sin6_addr.s6_addr)); 2599 to = (struct sockaddr *)&sin6; 2600 break; 2601 #endif 2602 #ifdef INET 2603 case SCTP_IPV4_ADDRESS: 2604 memset(&sin, 0, sizeof(sin)); 2605 sin.sin_family = AF_INET; 2606 sin.sin_len = sizeof(sin); 2607 sin.sin_port = sh->src_port; 2608 sin.sin_addr.s_addr = cookie->address[0]; 2609 to = (struct sockaddr *)&sin; 2610 break; 2611 #endif 2612 default: 2613 /* This should not happen */ 2614 return (NULL); 2615 } 2616 if (*stcb == NULL) { 2617 /* Yep, lets check */ 2618 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL); 2619 if (*stcb == NULL) { 2620 /* 2621 * We should have only got back the same inp. If we 2622 * got back a different ep we have a problem. The 2623 * original findep got back l_inp and now 2624 */ 2625 if (l_inp != *inp_p) { 2626 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n"); 2627 } 2628 } else { 2629 if (*locked_tcb == NULL) { 2630 /* 2631 * In this case we found the assoc only 2632 * after we locked the create lock. This 2633 * means we are in a colliding case and we 2634 * must make sure that we unlock the tcb if 2635 * its one of the cases where we throw away 2636 * the incoming packets. 2637 */ 2638 *locked_tcb = *stcb; 2639 2640 /* 2641 * We must also increment the inp ref count 2642 * since the ref_count flags was set when we 2643 * did not find the TCB, now we found it 2644 * which reduces the refcount.. we must 2645 * raise it back out to balance it all :-) 2646 */ 2647 SCTP_INP_INCR_REF((*stcb)->sctp_ep); 2648 if ((*stcb)->sctp_ep != l_inp) { 2649 SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n", 2650 (void *)(*stcb)->sctp_ep, (void *)l_inp); 2651 } 2652 } 2653 } 2654 } 2655 cookie_len -= SCTP_SIGNATURE_SIZE; 2656 if (*stcb == NULL) { 2657 /* this is the "normal" case... get a new TCB */ 2658 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh, 2659 cookie, cookie_len, *inp_p, 2660 netp, to, ¬ification, 2661 auth_skipped, auth_offset, auth_len, 2662 mflowtype, mflowid, 2663 vrf_id, port); 2664 } else { 2665 /* this is abnormal... cookie-echo on existing TCB */ 2666 had_a_existing_tcb = 1; 2667 *stcb = sctp_process_cookie_existing(m, iphlen, offset, 2668 src, dst, sh, 2669 cookie, cookie_len, *inp_p, *stcb, netp, to, 2670 ¬ification, auth_skipped, auth_offset, auth_len, 2671 mflowtype, mflowid, 2672 vrf_id, port); 2673 } 2674 2675 if (*stcb == NULL) { 2676 /* still no TCB... must be bad cookie-echo */ 2677 return (NULL); 2678 } 2679 if (*netp != NULL) { 2680 (*netp)->flowtype = mflowtype; 2681 (*netp)->flowid = mflowid; 2682 } 2683 /* 2684 * Ok, we built an association so confirm the address we sent the 2685 * INIT-ACK to. 2686 */ 2687 netl = sctp_findnet(*stcb, to); 2688 /* 2689 * This code should in theory NOT run but 2690 */ 2691 if (netl == NULL) { 2692 /* TSNH! Huh, why do I need to add this address here? */ 2693 if (sctp_add_remote_addr(*stcb, to, NULL, SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) { 2694 return (NULL); 2695 } 2696 netl = sctp_findnet(*stcb, to); 2697 } 2698 if (netl) { 2699 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) { 2700 netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 2701 (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL, 2702 netl); 2703 send_int_conf = 1; 2704 } 2705 } 2706 sctp_start_net_timers(*stcb); 2707 if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) { 2708 if (!had_a_existing_tcb || 2709 (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) { 2710 /* 2711 * If we have a NEW cookie or the connect never 2712 * reached the connected state during collision we 2713 * must do the TCP accept thing. 2714 */ 2715 struct socket *so, *oso; 2716 struct sctp_inpcb *inp; 2717 2718 if (notification == SCTP_NOTIFY_ASSOC_RESTART) { 2719 /* 2720 * For a restart we will keep the same 2721 * socket, no need to do anything. I THINK!! 2722 */ 2723 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2724 if (send_int_conf) { 2725 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2726 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2727 } 2728 return (m); 2729 } 2730 oso = (*inp_p)->sctp_socket; 2731 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2732 SCTP_TCB_UNLOCK((*stcb)); 2733 CURVNET_SET(oso->so_vnet); 2734 so = sonewconn(oso, 0 2735 ); 2736 CURVNET_RESTORE(); 2737 SCTP_TCB_LOCK((*stcb)); 2738 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2739 2740 if (so == NULL) { 2741 struct mbuf *op_err; 2742 2743 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2744 struct socket *pcb_so; 2745 2746 #endif 2747 /* Too many sockets */ 2748 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n"); 2749 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2750 sctp_abort_association(*inp_p, NULL, m, iphlen, 2751 src, dst, sh, op_err, 2752 mflowtype, mflowid, 2753 vrf_id, port); 2754 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2755 pcb_so = SCTP_INP_SO(*inp_p); 2756 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2757 SCTP_TCB_UNLOCK((*stcb)); 2758 SCTP_SOCKET_LOCK(pcb_so, 1); 2759 SCTP_TCB_LOCK((*stcb)); 2760 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2761 #endif 2762 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, 2763 SCTP_FROM_SCTP_INPUT + SCTP_LOC_23); 2764 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2765 SCTP_SOCKET_UNLOCK(pcb_so, 1); 2766 #endif 2767 return (NULL); 2768 } 2769 inp = (struct sctp_inpcb *)so->so_pcb; 2770 SCTP_INP_INCR_REF(inp); 2771 /* 2772 * We add the unbound flag here so that if we get an 2773 * soabort() before we get the move_pcb done, we 2774 * will properly cleanup. 2775 */ 2776 inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE | 2777 SCTP_PCB_FLAGS_CONNECTED | 2778 SCTP_PCB_FLAGS_IN_TCPPOOL | 2779 SCTP_PCB_FLAGS_UNBOUND | 2780 (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) | 2781 SCTP_PCB_FLAGS_DONT_WAKE); 2782 inp->sctp_features = (*inp_p)->sctp_features; 2783 inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features; 2784 inp->sctp_socket = so; 2785 inp->sctp_frag_point = (*inp_p)->sctp_frag_point; 2786 inp->max_cwnd = (*inp_p)->max_cwnd; 2787 inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off; 2788 inp->ecn_supported = (*inp_p)->ecn_supported; 2789 inp->prsctp_supported = (*inp_p)->prsctp_supported; 2790 inp->auth_supported = (*inp_p)->auth_supported; 2791 inp->asconf_supported = (*inp_p)->asconf_supported; 2792 inp->reconfig_supported = (*inp_p)->reconfig_supported; 2793 inp->nrsack_supported = (*inp_p)->nrsack_supported; 2794 inp->pktdrop_supported = (*inp_p)->pktdrop_supported; 2795 inp->partial_delivery_point = (*inp_p)->partial_delivery_point; 2796 inp->sctp_context = (*inp_p)->sctp_context; 2797 inp->local_strreset_support = (*inp_p)->local_strreset_support; 2798 inp->fibnum = (*inp_p)->fibnum; 2799 inp->inp_starting_point_for_iterator = NULL; 2800 /* 2801 * copy in the authentication parameters from the 2802 * original endpoint 2803 */ 2804 if (inp->sctp_ep.local_hmacs) 2805 sctp_free_hmaclist(inp->sctp_ep.local_hmacs); 2806 inp->sctp_ep.local_hmacs = 2807 sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs); 2808 if (inp->sctp_ep.local_auth_chunks) 2809 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks); 2810 inp->sctp_ep.local_auth_chunks = 2811 sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks); 2812 2813 /* 2814 * Now we must move it from one hash table to 2815 * another and get the tcb in the right place. 2816 */ 2817 2818 /* 2819 * This is where the one-2-one socket is put into 2820 * the accept state waiting for the accept! 2821 */ 2822 if (*stcb) { 2823 (*stcb)->asoc.state |= SCTP_STATE_IN_ACCEPT_QUEUE; 2824 } 2825 sctp_move_pcb_and_assoc(*inp_p, inp, *stcb); 2826 2827 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2828 SCTP_TCB_UNLOCK((*stcb)); 2829 2830 sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb, 2831 0); 2832 SCTP_TCB_LOCK((*stcb)); 2833 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2834 2835 2836 /* 2837 * now we must check to see if we were aborted while 2838 * the move was going on and the lock/unlock 2839 * happened. 2840 */ 2841 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 2842 /* 2843 * yep it was, we leave the assoc attached 2844 * to the socket since the sctp_inpcb_free() 2845 * call will send an abort for us. 2846 */ 2847 SCTP_INP_DECR_REF(inp); 2848 return (NULL); 2849 } 2850 SCTP_INP_DECR_REF(inp); 2851 /* Switch over to the new guy */ 2852 *inp_p = inp; 2853 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2854 if (send_int_conf) { 2855 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2856 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2857 } 2858 /* 2859 * Pull it from the incomplete queue and wake the 2860 * guy 2861 */ 2862 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2863 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2864 SCTP_TCB_UNLOCK((*stcb)); 2865 SCTP_SOCKET_LOCK(so, 1); 2866 #endif 2867 soisconnected(so); 2868 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2869 SCTP_TCB_LOCK((*stcb)); 2870 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2871 SCTP_SOCKET_UNLOCK(so, 1); 2872 #endif 2873 return (m); 2874 } 2875 } 2876 if (notification) { 2877 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2878 } 2879 if (send_int_conf) { 2880 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2881 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2882 } 2883 return (m); 2884 } 2885 2886 static void 2887 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED, 2888 struct sctp_tcb *stcb, struct sctp_nets *net) 2889 { 2890 /* cp must not be used, others call this without a c-ack :-) */ 2891 struct sctp_association *asoc; 2892 2893 SCTPDBG(SCTP_DEBUG_INPUT2, 2894 "sctp_handle_cookie_ack: handling COOKIE-ACK\n"); 2895 if ((stcb == NULL) || (net == NULL)) { 2896 return; 2897 } 2898 asoc = &stcb->asoc; 2899 2900 sctp_stop_all_cookie_timers(stcb); 2901 /* process according to association state */ 2902 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) { 2903 /* state change only needed when I am in right state */ 2904 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2905 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 2906 sctp_start_net_timers(stcb); 2907 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2908 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2909 stcb->sctp_ep, stcb, asoc->primary_destination); 2910 2911 } 2912 /* update RTO */ 2913 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 2914 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2915 if (asoc->overall_error_count == 0) { 2916 net->RTO = sctp_calculate_rto(stcb, asoc, net, 2917 &asoc->time_entered, sctp_align_safe_nocopy, 2918 SCTP_RTT_FROM_NON_DATA); 2919 } 2920 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 2921 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2922 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2923 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 2924 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2925 struct socket *so; 2926 2927 #endif 2928 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2929 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2930 so = SCTP_INP_SO(stcb->sctp_ep); 2931 atomic_add_int(&stcb->asoc.refcnt, 1); 2932 SCTP_TCB_UNLOCK(stcb); 2933 SCTP_SOCKET_LOCK(so, 1); 2934 SCTP_TCB_LOCK(stcb); 2935 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2936 #endif 2937 if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) { 2938 soisconnected(stcb->sctp_socket); 2939 } 2940 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2941 SCTP_SOCKET_UNLOCK(so, 1); 2942 #endif 2943 } 2944 /* 2945 * since we did not send a HB make sure we don't double 2946 * things 2947 */ 2948 net->hb_responded = 1; 2949 2950 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2951 /* 2952 * We don't need to do the asconf thing, nor hb or 2953 * autoclose if the socket is closed. 2954 */ 2955 goto closed_socket; 2956 } 2957 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 2958 stcb, net); 2959 2960 2961 if (stcb->asoc.sctp_autoclose_ticks && 2962 sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2963 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 2964 stcb->sctp_ep, stcb, NULL); 2965 } 2966 /* 2967 * send ASCONF if parameters are pending and ASCONFs are 2968 * allowed (eg. addresses changed when init/cookie echo were 2969 * in flight) 2970 */ 2971 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) && 2972 (stcb->asoc.asconf_supported == 1) && 2973 (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) { 2974 #ifdef SCTP_TIMER_BASED_ASCONF 2975 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, 2976 stcb->sctp_ep, stcb, 2977 stcb->asoc.primary_destination); 2978 #else 2979 sctp_send_asconf(stcb, stcb->asoc.primary_destination, 2980 SCTP_ADDR_NOT_LOCKED); 2981 #endif 2982 } 2983 } 2984 closed_socket: 2985 /* Toss the cookie if I can */ 2986 sctp_toss_old_cookies(stcb, asoc); 2987 if (!TAILQ_EMPTY(&asoc->sent_queue)) { 2988 /* Restart the timer if we have pending data */ 2989 struct sctp_tmit_chunk *chk; 2990 2991 chk = TAILQ_FIRST(&asoc->sent_queue); 2992 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 2993 } 2994 } 2995 2996 static void 2997 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp, 2998 struct sctp_tcb *stcb) 2999 { 3000 struct sctp_nets *net; 3001 struct sctp_tmit_chunk *lchk; 3002 struct sctp_ecne_chunk bkup; 3003 uint8_t override_bit; 3004 uint32_t tsn, window_data_tsn; 3005 int len; 3006 unsigned int pkt_cnt; 3007 3008 len = ntohs(cp->ch.chunk_length); 3009 if ((len != sizeof(struct sctp_ecne_chunk)) && 3010 (len != sizeof(struct old_sctp_ecne_chunk))) { 3011 return; 3012 } 3013 if (len == sizeof(struct old_sctp_ecne_chunk)) { 3014 /* Its the old format */ 3015 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk)); 3016 bkup.num_pkts_since_cwr = htonl(1); 3017 cp = &bkup; 3018 } 3019 SCTP_STAT_INCR(sctps_recvecne); 3020 tsn = ntohl(cp->tsn); 3021 pkt_cnt = ntohl(cp->num_pkts_since_cwr); 3022 lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead); 3023 if (lchk == NULL) { 3024 window_data_tsn = stcb->asoc.sending_seq - 1; 3025 } else { 3026 window_data_tsn = lchk->rec.data.TSN_seq; 3027 } 3028 3029 /* Find where it was sent to if possible. */ 3030 net = NULL; 3031 TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) { 3032 if (lchk->rec.data.TSN_seq == tsn) { 3033 net = lchk->whoTo; 3034 net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send; 3035 break; 3036 } 3037 if (SCTP_TSN_GT(lchk->rec.data.TSN_seq, tsn)) { 3038 break; 3039 } 3040 } 3041 if (net == NULL) { 3042 /* 3043 * What to do. A previous send of a CWR was possibly lost. 3044 * See how old it is, we may have it marked on the actual 3045 * net. 3046 */ 3047 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 3048 if (tsn == net->last_cwr_tsn) { 3049 /* Found him, send it off */ 3050 break; 3051 } 3052 } 3053 if (net == NULL) { 3054 /* 3055 * If we reach here, we need to send a special CWR 3056 * that says hey, we did this a long time ago and 3057 * you lost the response. 3058 */ 3059 net = TAILQ_FIRST(&stcb->asoc.nets); 3060 if (net == NULL) { 3061 /* TSNH */ 3062 return; 3063 } 3064 override_bit = SCTP_CWR_REDUCE_OVERRIDE; 3065 } else { 3066 override_bit = 0; 3067 } 3068 } else { 3069 override_bit = 0; 3070 } 3071 if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) && 3072 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 3073 /* 3074 * JRS - Use the congestion control given in the pluggable 3075 * CC module 3076 */ 3077 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt); 3078 /* 3079 * We reduce once every RTT. So we will only lower cwnd at 3080 * the next sending seq i.e. the window_data_tsn 3081 */ 3082 net->cwr_window_tsn = window_data_tsn; 3083 net->ecn_ce_pkt_cnt += pkt_cnt; 3084 net->lost_cnt = pkt_cnt; 3085 net->last_cwr_tsn = tsn; 3086 } else { 3087 override_bit |= SCTP_CWR_IN_SAME_WINDOW; 3088 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) && 3089 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 3090 /* 3091 * Another loss in the same window update how many 3092 * marks/packets lost we have had. 3093 */ 3094 int cnt = 1; 3095 3096 if (pkt_cnt > net->lost_cnt) { 3097 /* Should be the case */ 3098 cnt = (pkt_cnt - net->lost_cnt); 3099 net->ecn_ce_pkt_cnt += cnt; 3100 } 3101 net->lost_cnt = pkt_cnt; 3102 net->last_cwr_tsn = tsn; 3103 /* 3104 * Most CC functions will ignore this call, since we 3105 * are in-window yet of the initial CE the peer saw. 3106 */ 3107 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt); 3108 } 3109 } 3110 /* 3111 * We always send a CWR this way if our previous one was lost our 3112 * peer will get an update, or if it is not time again to reduce we 3113 * still get the cwr to the peer. Note we set the override when we 3114 * could not find the TSN on the chunk or the destination network. 3115 */ 3116 sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit); 3117 } 3118 3119 static void 3120 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net) 3121 { 3122 /* 3123 * Here we get a CWR from the peer. We must look in the outqueue and 3124 * make sure that we have a covered ECNE in the control chunk part. 3125 * If so remove it. 3126 */ 3127 struct sctp_tmit_chunk *chk; 3128 struct sctp_ecne_chunk *ecne; 3129 int override; 3130 uint32_t cwr_tsn; 3131 3132 cwr_tsn = ntohl(cp->tsn); 3133 override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE; 3134 TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) { 3135 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) { 3136 continue; 3137 } 3138 if ((override == 0) && (chk->whoTo != net)) { 3139 /* Must be from the right src unless override is set */ 3140 continue; 3141 } 3142 ecne = mtod(chk->data, struct sctp_ecne_chunk *); 3143 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) { 3144 /* this covers this ECNE, we can remove it */ 3145 stcb->asoc.ecn_echo_cnt_onq--; 3146 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, 3147 sctp_next); 3148 sctp_m_freem(chk->data); 3149 chk->data = NULL; 3150 stcb->asoc.ctrl_queue_cnt--; 3151 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3152 if (override == 0) { 3153 break; 3154 } 3155 } 3156 } 3157 } 3158 3159 static void 3160 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED, 3161 struct sctp_tcb *stcb, struct sctp_nets *net) 3162 { 3163 struct sctp_association *asoc; 3164 3165 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3166 struct socket *so; 3167 3168 #endif 3169 3170 SCTPDBG(SCTP_DEBUG_INPUT2, 3171 "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n"); 3172 if (stcb == NULL) 3173 return; 3174 3175 asoc = &stcb->asoc; 3176 /* process according to association state */ 3177 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 3178 /* unexpected SHUTDOWN-COMPLETE... so ignore... */ 3179 SCTPDBG(SCTP_DEBUG_INPUT2, 3180 "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n"); 3181 SCTP_TCB_UNLOCK(stcb); 3182 return; 3183 } 3184 /* notify upper layer protocol */ 3185 if (stcb->sctp_socket) { 3186 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 3187 } 3188 #ifdef INVARIANTS 3189 if (!TAILQ_EMPTY(&asoc->send_queue) || 3190 !TAILQ_EMPTY(&asoc->sent_queue) || 3191 !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 3192 panic("Queues are not empty when handling SHUTDOWN-COMPLETE"); 3193 } 3194 #endif 3195 /* stop the timer */ 3196 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, 3197 SCTP_FROM_SCTP_INPUT + SCTP_LOC_24); 3198 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 3199 /* free the TCB */ 3200 SCTPDBG(SCTP_DEBUG_INPUT2, 3201 "sctp_handle_shutdown_complete: calls free-asoc\n"); 3202 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3203 so = SCTP_INP_SO(stcb->sctp_ep); 3204 atomic_add_int(&stcb->asoc.refcnt, 1); 3205 SCTP_TCB_UNLOCK(stcb); 3206 SCTP_SOCKET_LOCK(so, 1); 3207 SCTP_TCB_LOCK(stcb); 3208 atomic_subtract_int(&stcb->asoc.refcnt, 1); 3209 #endif 3210 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 3211 SCTP_FROM_SCTP_INPUT + SCTP_LOC_25); 3212 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3213 SCTP_SOCKET_UNLOCK(so, 1); 3214 #endif 3215 return; 3216 } 3217 3218 static int 3219 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc, 3220 struct sctp_nets *net, uint8_t flg) 3221 { 3222 switch (desc->chunk_type) { 3223 case SCTP_DATA: 3224 /* find the tsn to resend (possibly */ 3225 { 3226 uint32_t tsn; 3227 struct sctp_tmit_chunk *tp1; 3228 3229 tsn = ntohl(desc->tsn_ifany); 3230 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3231 if (tp1->rec.data.TSN_seq == tsn) { 3232 /* found it */ 3233 break; 3234 } 3235 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, tsn)) { 3236 /* not found */ 3237 tp1 = NULL; 3238 break; 3239 } 3240 } 3241 if (tp1 == NULL) { 3242 /* 3243 * Do it the other way , aka without paying 3244 * attention to queue seq order. 3245 */ 3246 SCTP_STAT_INCR(sctps_pdrpdnfnd); 3247 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3248 if (tp1->rec.data.TSN_seq == tsn) { 3249 /* found it */ 3250 break; 3251 } 3252 } 3253 } 3254 if (tp1 == NULL) { 3255 SCTP_STAT_INCR(sctps_pdrptsnnf); 3256 } 3257 if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) { 3258 uint8_t *ddp; 3259 3260 if (((flg & SCTP_BADCRC) == 0) && 3261 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3262 return (0); 3263 } 3264 if ((stcb->asoc.peers_rwnd == 0) && 3265 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3266 SCTP_STAT_INCR(sctps_pdrpdiwnp); 3267 return (0); 3268 } 3269 if (stcb->asoc.peers_rwnd == 0 && 3270 (flg & SCTP_FROM_MIDDLE_BOX)) { 3271 SCTP_STAT_INCR(sctps_pdrpdizrw); 3272 return (0); 3273 } 3274 ddp = (uint8_t *) (mtod(tp1->data, caddr_t)+ 3275 sizeof(struct sctp_data_chunk)); 3276 { 3277 unsigned int iii; 3278 3279 for (iii = 0; iii < sizeof(desc->data_bytes); 3280 iii++) { 3281 if (ddp[iii] != desc->data_bytes[iii]) { 3282 SCTP_STAT_INCR(sctps_pdrpbadd); 3283 return (-1); 3284 } 3285 } 3286 } 3287 3288 if (tp1->do_rtt) { 3289 /* 3290 * this guy had a RTO calculation 3291 * pending on it, cancel it 3292 */ 3293 if (tp1->whoTo->rto_needed == 0) { 3294 tp1->whoTo->rto_needed = 1; 3295 } 3296 tp1->do_rtt = 0; 3297 } 3298 SCTP_STAT_INCR(sctps_pdrpmark); 3299 if (tp1->sent != SCTP_DATAGRAM_RESEND) 3300 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3301 /* 3302 * mark it as if we were doing a FR, since 3303 * we will be getting gap ack reports behind 3304 * the info from the router. 3305 */ 3306 tp1->rec.data.doing_fast_retransmit = 1; 3307 /* 3308 * mark the tsn with what sequences can 3309 * cause a new FR. 3310 */ 3311 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) { 3312 tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq; 3313 } else { 3314 tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq; 3315 } 3316 3317 /* restart the timer */ 3318 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3319 stcb, tp1->whoTo, 3320 SCTP_FROM_SCTP_INPUT + SCTP_LOC_26); 3321 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3322 stcb, tp1->whoTo); 3323 3324 /* fix counts and things */ 3325 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 3326 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP, 3327 tp1->whoTo->flight_size, 3328 tp1->book_size, 3329 (uintptr_t) stcb, 3330 tp1->rec.data.TSN_seq); 3331 } 3332 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3333 sctp_flight_size_decrease(tp1); 3334 sctp_total_flight_decrease(stcb, tp1); 3335 } 3336 tp1->sent = SCTP_DATAGRAM_RESEND; 3337 } { 3338 /* audit code */ 3339 unsigned int audit; 3340 3341 audit = 0; 3342 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3343 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3344 audit++; 3345 } 3346 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue, 3347 sctp_next) { 3348 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3349 audit++; 3350 } 3351 if (audit != stcb->asoc.sent_queue_retran_cnt) { 3352 SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n", 3353 audit, stcb->asoc.sent_queue_retran_cnt); 3354 #ifndef SCTP_AUDITING_ENABLED 3355 stcb->asoc.sent_queue_retran_cnt = audit; 3356 #endif 3357 } 3358 } 3359 } 3360 break; 3361 case SCTP_ASCONF: 3362 { 3363 struct sctp_tmit_chunk *asconf; 3364 3365 TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue, 3366 sctp_next) { 3367 if (asconf->rec.chunk_id.id == SCTP_ASCONF) { 3368 break; 3369 } 3370 } 3371 if (asconf) { 3372 if (asconf->sent != SCTP_DATAGRAM_RESEND) 3373 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3374 asconf->sent = SCTP_DATAGRAM_RESEND; 3375 asconf->snd_count--; 3376 } 3377 } 3378 break; 3379 case SCTP_INITIATION: 3380 /* resend the INIT */ 3381 stcb->asoc.dropped_special_cnt++; 3382 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) { 3383 /* 3384 * If we can get it in, in a few attempts we do 3385 * this, otherwise we let the timer fire. 3386 */ 3387 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, 3388 stcb, net, 3389 SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 3390 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 3391 } 3392 break; 3393 case SCTP_SELECTIVE_ACK: 3394 case SCTP_NR_SELECTIVE_ACK: 3395 /* resend the sack */ 3396 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED); 3397 break; 3398 case SCTP_HEARTBEAT_REQUEST: 3399 /* resend a demand HB */ 3400 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) { 3401 /* 3402 * Only retransmit if we KNOW we wont destroy the 3403 * tcb 3404 */ 3405 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 3406 } 3407 break; 3408 case SCTP_SHUTDOWN: 3409 sctp_send_shutdown(stcb, net); 3410 break; 3411 case SCTP_SHUTDOWN_ACK: 3412 sctp_send_shutdown_ack(stcb, net); 3413 break; 3414 case SCTP_COOKIE_ECHO: 3415 { 3416 struct sctp_tmit_chunk *cookie; 3417 3418 cookie = NULL; 3419 TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, 3420 sctp_next) { 3421 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) { 3422 break; 3423 } 3424 } 3425 if (cookie) { 3426 if (cookie->sent != SCTP_DATAGRAM_RESEND) 3427 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3428 cookie->sent = SCTP_DATAGRAM_RESEND; 3429 sctp_stop_all_cookie_timers(stcb); 3430 } 3431 } 3432 break; 3433 case SCTP_COOKIE_ACK: 3434 sctp_send_cookie_ack(stcb); 3435 break; 3436 case SCTP_ASCONF_ACK: 3437 /* resend last asconf ack */ 3438 sctp_send_asconf_ack(stcb); 3439 break; 3440 case SCTP_FORWARD_CUM_TSN: 3441 send_forward_tsn(stcb, &stcb->asoc); 3442 break; 3443 /* can't do anything with these */ 3444 case SCTP_PACKET_DROPPED: 3445 case SCTP_INITIATION_ACK: /* this should not happen */ 3446 case SCTP_HEARTBEAT_ACK: 3447 case SCTP_ABORT_ASSOCIATION: 3448 case SCTP_OPERATION_ERROR: 3449 case SCTP_SHUTDOWN_COMPLETE: 3450 case SCTP_ECN_ECHO: 3451 case SCTP_ECN_CWR: 3452 default: 3453 break; 3454 } 3455 return (0); 3456 } 3457 3458 void 3459 sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list) 3460 { 3461 uint32_t i; 3462 uint16_t temp; 3463 3464 /* 3465 * We set things to 0xffff since this is the last delivered sequence 3466 * and we will be sending in 0 after the reset. 3467 */ 3468 3469 if (number_entries) { 3470 for (i = 0; i < number_entries; i++) { 3471 temp = ntohs(list[i]); 3472 if (temp >= stcb->asoc.streamincnt) { 3473 continue; 3474 } 3475 stcb->asoc.strmin[temp].last_sequence_delivered = 0xffff; 3476 } 3477 } else { 3478 list = NULL; 3479 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3480 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff; 3481 } 3482 } 3483 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3484 } 3485 3486 static void 3487 sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list) 3488 { 3489 uint32_t i; 3490 uint16_t temp; 3491 3492 if (number_entries > 0) { 3493 for (i = 0; i < number_entries; i++) { 3494 temp = ntohs(list[i]); 3495 if (temp >= stcb->asoc.streamoutcnt) { 3496 /* no such stream */ 3497 continue; 3498 } 3499 stcb->asoc.strmout[temp].next_sequence_send = 0; 3500 } 3501 } else { 3502 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3503 stcb->asoc.strmout[i].next_sequence_send = 0; 3504 } 3505 } 3506 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3507 } 3508 3509 3510 struct sctp_stream_reset_request * 3511 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk) 3512 { 3513 struct sctp_association *asoc; 3514 struct sctp_chunkhdr *ch; 3515 struct sctp_stream_reset_request *r; 3516 struct sctp_tmit_chunk *chk; 3517 int len, clen; 3518 3519 asoc = &stcb->asoc; 3520 if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 3521 asoc->stream_reset_outstanding = 0; 3522 return (NULL); 3523 } 3524 if (stcb->asoc.str_reset == NULL) { 3525 asoc->stream_reset_outstanding = 0; 3526 return (NULL); 3527 } 3528 chk = stcb->asoc.str_reset; 3529 if (chk->data == NULL) { 3530 return (NULL); 3531 } 3532 if (bchk) { 3533 /* he wants a copy of the chk pointer */ 3534 *bchk = chk; 3535 } 3536 clen = chk->send_size; 3537 ch = mtod(chk->data, struct sctp_chunkhdr *); 3538 r = (struct sctp_stream_reset_request *)(ch + 1); 3539 if (ntohl(r->request_seq) == seq) { 3540 /* found it */ 3541 return (r); 3542 } 3543 len = SCTP_SIZE32(ntohs(r->ph.param_length)); 3544 if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) { 3545 /* move to the next one, there can only be a max of two */ 3546 r = (struct sctp_stream_reset_request *)((caddr_t)r + len); 3547 if (ntohl(r->request_seq) == seq) { 3548 return (r); 3549 } 3550 } 3551 /* that seq is not here */ 3552 return (NULL); 3553 } 3554 3555 static void 3556 sctp_clean_up_stream_reset(struct sctp_tcb *stcb) 3557 { 3558 struct sctp_association *asoc; 3559 struct sctp_tmit_chunk *chk = stcb->asoc.str_reset; 3560 3561 if (stcb->asoc.str_reset == NULL) { 3562 return; 3563 } 3564 asoc = &stcb->asoc; 3565 3566 sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, 3567 chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_28); 3568 TAILQ_REMOVE(&asoc->control_send_queue, 3569 chk, 3570 sctp_next); 3571 if (chk->data) { 3572 sctp_m_freem(chk->data); 3573 chk->data = NULL; 3574 } 3575 asoc->ctrl_queue_cnt--; 3576 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3577 /* sa_ignore NO_NULL_CHK */ 3578 stcb->asoc.str_reset = NULL; 3579 } 3580 3581 3582 static int 3583 sctp_handle_stream_reset_response(struct sctp_tcb *stcb, 3584 uint32_t seq, uint32_t action, 3585 struct sctp_stream_reset_response *respin) 3586 { 3587 uint16_t type; 3588 int lparm_len; 3589 struct sctp_association *asoc = &stcb->asoc; 3590 struct sctp_tmit_chunk *chk; 3591 struct sctp_stream_reset_request *req_param; 3592 struct sctp_stream_reset_out_request *req_out_param; 3593 struct sctp_stream_reset_in_request *req_in_param; 3594 uint32_t number_entries; 3595 3596 if (asoc->stream_reset_outstanding == 0) { 3597 /* duplicate */ 3598 return (0); 3599 } 3600 if (seq == stcb->asoc.str_reset_seq_out) { 3601 req_param = sctp_find_stream_reset(stcb, seq, &chk); 3602 if (req_param != NULL) { 3603 stcb->asoc.str_reset_seq_out++; 3604 type = ntohs(req_param->ph.param_type); 3605 lparm_len = ntohs(req_param->ph.param_length); 3606 if (type == SCTP_STR_RESET_OUT_REQUEST) { 3607 req_out_param = (struct sctp_stream_reset_out_request *)req_param; 3608 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t); 3609 asoc->stream_reset_out_is_outstanding = 0; 3610 if (asoc->stream_reset_outstanding) 3611 asoc->stream_reset_outstanding--; 3612 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3613 /* do it */ 3614 sctp_reset_out_streams(stcb, number_entries, req_out_param->list_of_streams); 3615 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3616 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3617 } else { 3618 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3619 } 3620 } else if (type == SCTP_STR_RESET_IN_REQUEST) { 3621 req_in_param = (struct sctp_stream_reset_in_request *)req_param; 3622 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t); 3623 if (asoc->stream_reset_outstanding) 3624 asoc->stream_reset_outstanding--; 3625 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3626 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb, 3627 number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3628 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3629 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb, 3630 number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3631 } 3632 } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) { 3633 /* Ok we now may have more streams */ 3634 int num_stream; 3635 3636 num_stream = stcb->asoc.strm_pending_add_size; 3637 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) { 3638 /* TSNH */ 3639 num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt; 3640 } 3641 stcb->asoc.strm_pending_add_size = 0; 3642 if (asoc->stream_reset_outstanding) 3643 asoc->stream_reset_outstanding--; 3644 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3645 /* Put the new streams into effect */ 3646 stcb->asoc.streamoutcnt += num_stream; 3647 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 3648 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3649 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3650 SCTP_STREAM_CHANGE_DENIED); 3651 } else { 3652 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3653 SCTP_STREAM_CHANGE_FAILED); 3654 } 3655 } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) { 3656 if (asoc->stream_reset_outstanding) 3657 asoc->stream_reset_outstanding--; 3658 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3659 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3660 SCTP_STREAM_CHANGE_DENIED); 3661 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3662 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3663 SCTP_STREAM_CHANGE_FAILED); 3664 } 3665 } else if (type == SCTP_STR_RESET_TSN_REQUEST) { 3666 /** 3667 * a) Adopt the new in tsn. 3668 * b) reset the map 3669 * c) Adopt the new out-tsn 3670 */ 3671 struct sctp_stream_reset_response_tsn *resp; 3672 struct sctp_forward_tsn_chunk fwdtsn; 3673 int abort_flag = 0; 3674 3675 if (respin == NULL) { 3676 /* huh ? */ 3677 return (0); 3678 } 3679 if (ntohs(respin->ph.param_length) < sizeof(struct sctp_stream_reset_response_tsn)) { 3680 return (0); 3681 } 3682 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3683 resp = (struct sctp_stream_reset_response_tsn *)respin; 3684 asoc->stream_reset_outstanding--; 3685 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3686 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3687 fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1); 3688 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3689 if (abort_flag) { 3690 return (1); 3691 } 3692 stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1); 3693 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3694 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3695 } 3696 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 3697 stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn); 3698 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 3699 3700 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map; 3701 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size); 3702 3703 stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn); 3704 stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn; 3705 3706 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL); 3707 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL); 3708 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0); 3709 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3710 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3711 SCTP_ASSOC_RESET_DENIED); 3712 } else { 3713 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3714 SCTP_ASSOC_RESET_FAILED); 3715 } 3716 } 3717 /* get rid of the request and get the request flags */ 3718 if (asoc->stream_reset_outstanding == 0) { 3719 sctp_clean_up_stream_reset(stcb); 3720 } 3721 } 3722 } 3723 return (0); 3724 } 3725 3726 static void 3727 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb, 3728 struct sctp_tmit_chunk *chk, 3729 struct sctp_stream_reset_in_request *req, int trunc) 3730 { 3731 uint32_t seq; 3732 int len, i; 3733 int number_entries; 3734 uint16_t temp; 3735 3736 /* 3737 * peer wants me to send a str-reset to him for my outgoing seq's if 3738 * seq_in is right. 3739 */ 3740 struct sctp_association *asoc = &stcb->asoc; 3741 3742 seq = ntohl(req->request_seq); 3743 if (asoc->str_reset_seq_in == seq) { 3744 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3745 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3746 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3747 } else if (trunc) { 3748 /* Can't do it, since they exceeded our buffer size */ 3749 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3750 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) { 3751 len = ntohs(req->ph.param_length); 3752 number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t)); 3753 for (i = 0; i < number_entries; i++) { 3754 temp = ntohs(req->list_of_streams[i]); 3755 req->list_of_streams[i] = temp; 3756 } 3757 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3758 sctp_add_stream_reset_out(chk, number_entries, req->list_of_streams, 3759 asoc->str_reset_seq_out, 3760 seq, (asoc->sending_seq - 1)); 3761 asoc->stream_reset_out_is_outstanding = 1; 3762 asoc->str_reset = chk; 3763 sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo); 3764 stcb->asoc.stream_reset_outstanding++; 3765 } else { 3766 /* Can't do it, since we have sent one out */ 3767 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 3768 } 3769 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3770 asoc->str_reset_seq_in++; 3771 } else if (asoc->str_reset_seq_in - 1 == seq) { 3772 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3773 } else if (asoc->str_reset_seq_in - 2 == seq) { 3774 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3775 } else { 3776 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3777 } 3778 } 3779 3780 static int 3781 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb, 3782 struct sctp_tmit_chunk *chk, 3783 struct sctp_stream_reset_tsn_request *req) 3784 { 3785 /* reset all in and out and update the tsn */ 3786 /* 3787 * A) reset my str-seq's on in and out. B) Select a receive next, 3788 * and set cum-ack to it. Also process this selected number as a 3789 * fwd-tsn as well. C) set in the response my next sending seq. 3790 */ 3791 struct sctp_forward_tsn_chunk fwdtsn; 3792 struct sctp_association *asoc = &stcb->asoc; 3793 int abort_flag = 0; 3794 uint32_t seq; 3795 3796 seq = ntohl(req->request_seq); 3797 if (asoc->str_reset_seq_in == seq) { 3798 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3799 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 3800 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3801 } else { 3802 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3803 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3804 fwdtsn.ch.chunk_flags = 0; 3805 fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1); 3806 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3807 if (abort_flag) { 3808 return (1); 3809 } 3810 asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA; 3811 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3812 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3813 } 3814 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map; 3815 asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1; 3816 memset(asoc->mapping_array, 0, asoc->mapping_array_size); 3817 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 3818 memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size); 3819 atomic_add_int(&asoc->sending_seq, 1); 3820 /* save off historical data for retrans */ 3821 asoc->last_sending_seq[1] = asoc->last_sending_seq[0]; 3822 asoc->last_sending_seq[0] = asoc->sending_seq; 3823 asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0]; 3824 asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn; 3825 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL); 3826 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL); 3827 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3828 sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0); 3829 } 3830 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3831 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3832 asoc->str_reset_seq_in++; 3833 } else if (asoc->str_reset_seq_in - 1 == seq) { 3834 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3835 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3836 } else if (asoc->str_reset_seq_in - 2 == seq) { 3837 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1], 3838 asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]); 3839 } else { 3840 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3841 } 3842 return (0); 3843 } 3844 3845 static void 3846 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb, 3847 struct sctp_tmit_chunk *chk, 3848 struct sctp_stream_reset_out_request *req, int trunc) 3849 { 3850 uint32_t seq, tsn; 3851 int number_entries, len; 3852 struct sctp_association *asoc = &stcb->asoc; 3853 3854 seq = ntohl(req->request_seq); 3855 3856 /* now if its not a duplicate we process it */ 3857 if (asoc->str_reset_seq_in == seq) { 3858 len = ntohs(req->ph.param_length); 3859 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t)); 3860 /* 3861 * the sender is resetting, handle the list issue.. we must 3862 * a) verify if we can do the reset, if so no problem b) If 3863 * we can't do the reset we must copy the request. c) queue 3864 * it, and setup the data in processor to trigger it off 3865 * when needed and dequeue all the queued data. 3866 */ 3867 tsn = ntohl(req->send_reset_at_tsn); 3868 3869 /* move the reset action back one */ 3870 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3871 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3872 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3873 } else if (trunc) { 3874 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3875 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) { 3876 /* we can do it now */ 3877 sctp_reset_in_stream(stcb, number_entries, req->list_of_streams); 3878 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3879 } else { 3880 /* 3881 * we must queue it up and thus wait for the TSN's 3882 * to arrive that are at or before tsn 3883 */ 3884 struct sctp_stream_reset_list *liste; 3885 int siz; 3886 3887 siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t)); 3888 SCTP_MALLOC(liste, struct sctp_stream_reset_list *, 3889 siz, SCTP_M_STRESET); 3890 if (liste == NULL) { 3891 /* gak out of memory */ 3892 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3893 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3894 return; 3895 } 3896 liste->tsn = tsn; 3897 liste->number_entries = number_entries; 3898 memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t)); 3899 TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp); 3900 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3901 } 3902 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3903 asoc->str_reset_seq_in++; 3904 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3905 /* 3906 * one seq back, just echo back last action since my 3907 * response was lost. 3908 */ 3909 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3910 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3911 /* 3912 * two seq back, just echo back last action since my 3913 * response was lost. 3914 */ 3915 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3916 } else { 3917 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3918 } 3919 } 3920 3921 static void 3922 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 3923 struct sctp_stream_reset_add_strm *str_add) 3924 { 3925 /* 3926 * Peer is requesting to add more streams. If its within our 3927 * max-streams we will allow it. 3928 */ 3929 uint32_t num_stream, i; 3930 uint32_t seq; 3931 struct sctp_association *asoc = &stcb->asoc; 3932 struct sctp_queued_to_read *ctl, *nctl; 3933 3934 /* Get the number. */ 3935 seq = ntohl(str_add->request_seq); 3936 num_stream = ntohs(str_add->number_of_streams); 3937 /* Now what would be the new total? */ 3938 if (asoc->str_reset_seq_in == seq) { 3939 num_stream += stcb->asoc.streamincnt; 3940 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3941 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 3942 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3943 } else if ((num_stream > stcb->asoc.max_inbound_streams) || 3944 (num_stream > 0xffff)) { 3945 /* We must reject it they ask for to many */ 3946 denied: 3947 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3948 } else { 3949 /* Ok, we can do that :-) */ 3950 struct sctp_stream_in *oldstrm; 3951 3952 /* save off the old */ 3953 oldstrm = stcb->asoc.strmin; 3954 SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *, 3955 (num_stream * sizeof(struct sctp_stream_in)), 3956 SCTP_M_STRMI); 3957 if (stcb->asoc.strmin == NULL) { 3958 stcb->asoc.strmin = oldstrm; 3959 goto denied; 3960 } 3961 /* copy off the old data */ 3962 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3963 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 3964 stcb->asoc.strmin[i].stream_no = i; 3965 stcb->asoc.strmin[i].last_sequence_delivered = oldstrm[i].last_sequence_delivered; 3966 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started; 3967 /* now anything on those queues? */ 3968 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next, nctl) { 3969 TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next); 3970 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next); 3971 } 3972 } 3973 /* Init the new streams */ 3974 for (i = stcb->asoc.streamincnt; i < num_stream; i++) { 3975 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 3976 stcb->asoc.strmin[i].stream_no = i; 3977 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff; 3978 stcb->asoc.strmin[i].delivery_started = 0; 3979 } 3980 SCTP_FREE(oldstrm, SCTP_M_STRMI); 3981 /* update the size */ 3982 stcb->asoc.streamincnt = num_stream; 3983 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3984 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 3985 } 3986 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3987 asoc->str_reset_seq_in++; 3988 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3989 /* 3990 * one seq back, just echo back last action since my 3991 * response was lost. 3992 */ 3993 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3994 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3995 /* 3996 * two seq back, just echo back last action since my 3997 * response was lost. 3998 */ 3999 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 4000 } else { 4001 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 4002 4003 } 4004 } 4005 4006 static void 4007 sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 4008 struct sctp_stream_reset_add_strm *str_add) 4009 { 4010 /* 4011 * Peer is requesting to add more streams. If its within our 4012 * max-streams we will allow it. 4013 */ 4014 uint16_t num_stream; 4015 uint32_t seq; 4016 struct sctp_association *asoc = &stcb->asoc; 4017 4018 /* Get the number. */ 4019 seq = ntohl(str_add->request_seq); 4020 num_stream = ntohs(str_add->number_of_streams); 4021 /* Now what would be the new total? */ 4022 if (asoc->str_reset_seq_in == seq) { 4023 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 4024 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 4025 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4026 } else if (stcb->asoc.stream_reset_outstanding) { 4027 /* We must reject it we have something pending */ 4028 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 4029 } else { 4030 /* Ok, we can do that :-) */ 4031 int mychk; 4032 4033 mychk = stcb->asoc.streamoutcnt; 4034 mychk += num_stream; 4035 if (mychk < 0x10000) { 4036 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 4037 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 0, 1, num_stream, 0, 1)) { 4038 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4039 } 4040 } else { 4041 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4042 } 4043 } 4044 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]); 4045 asoc->str_reset_seq_in++; 4046 } else if ((asoc->str_reset_seq_in - 1) == seq) { 4047 /* 4048 * one seq back, just echo back last action since my 4049 * response was lost. 4050 */ 4051 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4052 } else if ((asoc->str_reset_seq_in - 2) == seq) { 4053 /* 4054 * two seq back, just echo back last action since my 4055 * response was lost. 4056 */ 4057 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 4058 } else { 4059 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 4060 } 4061 } 4062 4063 #ifdef __GNUC__ 4064 __attribute__((noinline)) 4065 #endif 4066 static int 4067 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset, 4068 struct sctp_chunkhdr *ch_req) 4069 { 4070 uint16_t remaining_length, param_len, ptype; 4071 struct sctp_paramhdr pstore; 4072 uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE]; 4073 uint32_t seq = 0; 4074 int num_req = 0; 4075 int trunc = 0; 4076 struct sctp_tmit_chunk *chk; 4077 struct sctp_chunkhdr *ch; 4078 struct sctp_paramhdr *ph; 4079 int ret_code = 0; 4080 int num_param = 0; 4081 4082 /* now it may be a reset or a reset-response */ 4083 remaining_length = ntohs(ch_req->chunk_length) - sizeof(struct sctp_chunkhdr); 4084 4085 /* setup for adding the response */ 4086 sctp_alloc_a_chunk(stcb, chk); 4087 if (chk == NULL) { 4088 return (ret_code); 4089 } 4090 chk->copy_by_ref = 0; 4091 chk->rec.chunk_id.id = SCTP_STREAM_RESET; 4092 chk->rec.chunk_id.can_take_data = 0; 4093 chk->flags = 0; 4094 chk->asoc = &stcb->asoc; 4095 chk->no_fr_allowed = 0; 4096 chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr); 4097 chk->book_size_scale = 0; 4098 chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA); 4099 if (chk->data == NULL) { 4100 strres_nochunk: 4101 if (chk->data) { 4102 sctp_m_freem(chk->data); 4103 chk->data = NULL; 4104 } 4105 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 4106 return (ret_code); 4107 } 4108 SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD); 4109 4110 /* setup chunk parameters */ 4111 chk->sent = SCTP_DATAGRAM_UNSENT; 4112 chk->snd_count = 0; 4113 chk->whoTo = NULL; 4114 4115 ch = mtod(chk->data, struct sctp_chunkhdr *); 4116 ch->chunk_type = SCTP_STREAM_RESET; 4117 ch->chunk_flags = 0; 4118 ch->chunk_length = htons(chk->send_size); 4119 SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size); 4120 offset += sizeof(struct sctp_chunkhdr); 4121 while (remaining_length >= sizeof(struct sctp_paramhdr)) { 4122 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *) & pstore); 4123 if (ph == NULL) { 4124 /* TSNH */ 4125 break; 4126 } 4127 param_len = ntohs(ph->param_length); 4128 if ((param_len > remaining_length) || 4129 (param_len < (sizeof(struct sctp_paramhdr) + sizeof(uint32_t)))) { 4130 /* bad parameter length */ 4131 break; 4132 } 4133 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, sizeof(cstore)), 4134 (uint8_t *) & cstore); 4135 if (ph == NULL) { 4136 /* TSNH */ 4137 break; 4138 } 4139 ptype = ntohs(ph->param_type); 4140 num_param++; 4141 if (param_len > sizeof(cstore)) { 4142 trunc = 1; 4143 } else { 4144 trunc = 0; 4145 } 4146 if (num_param > SCTP_MAX_RESET_PARAMS) { 4147 /* hit the max of parameters already sorry.. */ 4148 break; 4149 } 4150 if (ptype == SCTP_STR_RESET_OUT_REQUEST) { 4151 struct sctp_stream_reset_out_request *req_out; 4152 4153 if (param_len < sizeof(struct sctp_stream_reset_out_request)) { 4154 break; 4155 } 4156 req_out = (struct sctp_stream_reset_out_request *)ph; 4157 num_req++; 4158 if (stcb->asoc.stream_reset_outstanding) { 4159 seq = ntohl(req_out->response_seq); 4160 if (seq == stcb->asoc.str_reset_seq_out) { 4161 /* implicit ack */ 4162 (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL); 4163 } 4164 } 4165 sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc); 4166 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) { 4167 struct sctp_stream_reset_add_strm *str_add; 4168 4169 if (param_len < sizeof(struct sctp_stream_reset_add_strm)) { 4170 break; 4171 } 4172 str_add = (struct sctp_stream_reset_add_strm *)ph; 4173 num_req++; 4174 sctp_handle_str_reset_add_strm(stcb, chk, str_add); 4175 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) { 4176 struct sctp_stream_reset_add_strm *str_add; 4177 4178 if (param_len < sizeof(struct sctp_stream_reset_add_strm)) { 4179 break; 4180 } 4181 str_add = (struct sctp_stream_reset_add_strm *)ph; 4182 num_req++; 4183 sctp_handle_str_reset_add_out_strm(stcb, chk, str_add); 4184 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) { 4185 struct sctp_stream_reset_in_request *req_in; 4186 4187 num_req++; 4188 req_in = (struct sctp_stream_reset_in_request *)ph; 4189 sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc); 4190 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) { 4191 struct sctp_stream_reset_tsn_request *req_tsn; 4192 4193 num_req++; 4194 req_tsn = (struct sctp_stream_reset_tsn_request *)ph; 4195 if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) { 4196 ret_code = 1; 4197 goto strres_nochunk; 4198 } 4199 /* no more */ 4200 break; 4201 } else if (ptype == SCTP_STR_RESET_RESPONSE) { 4202 struct sctp_stream_reset_response *resp; 4203 uint32_t result; 4204 4205 if (param_len < sizeof(struct sctp_stream_reset_response)) { 4206 break; 4207 } 4208 resp = (struct sctp_stream_reset_response *)ph; 4209 seq = ntohl(resp->response_seq); 4210 result = ntohl(resp->result); 4211 if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) { 4212 ret_code = 1; 4213 goto strres_nochunk; 4214 } 4215 } else { 4216 break; 4217 } 4218 offset += SCTP_SIZE32(param_len); 4219 if (remaining_length >= SCTP_SIZE32(param_len)) { 4220 remaining_length -= SCTP_SIZE32(param_len); 4221 } else { 4222 remaining_length = 0; 4223 } 4224 } 4225 if (num_req == 0) { 4226 /* we have no response free the stuff */ 4227 goto strres_nochunk; 4228 } 4229 /* ok we have a chunk to link in */ 4230 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, 4231 chk, 4232 sctp_next); 4233 stcb->asoc.ctrl_queue_cnt++; 4234 return (ret_code); 4235 } 4236 4237 /* 4238 * Handle a router or endpoints report of a packet loss, there are two ways 4239 * to handle this, either we get the whole packet and must disect it 4240 * ourselves (possibly with truncation and or corruption) or it is a summary 4241 * from a middle box that did the disectting for us. 4242 */ 4243 static void 4244 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp, 4245 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 4246 { 4247 uint32_t bottle_bw, on_queue; 4248 uint16_t trunc_len; 4249 unsigned int chlen; 4250 unsigned int at; 4251 struct sctp_chunk_desc desc; 4252 struct sctp_chunkhdr *ch; 4253 4254 chlen = ntohs(cp->ch.chunk_length); 4255 chlen -= sizeof(struct sctp_pktdrop_chunk); 4256 /* XXX possible chlen underflow */ 4257 if (chlen == 0) { 4258 ch = NULL; 4259 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) 4260 SCTP_STAT_INCR(sctps_pdrpbwrpt); 4261 } else { 4262 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr)); 4263 chlen -= sizeof(struct sctphdr); 4264 /* XXX possible chlen underflow */ 4265 memset(&desc, 0, sizeof(desc)); 4266 } 4267 trunc_len = (uint16_t) ntohs(cp->trunc_len); 4268 if (trunc_len > limit) { 4269 trunc_len = limit; 4270 } 4271 /* now the chunks themselves */ 4272 while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) { 4273 desc.chunk_type = ch->chunk_type; 4274 /* get amount we need to move */ 4275 at = ntohs(ch->chunk_length); 4276 if (at < sizeof(struct sctp_chunkhdr)) { 4277 /* corrupt chunk, maybe at the end? */ 4278 SCTP_STAT_INCR(sctps_pdrpcrupt); 4279 break; 4280 } 4281 if (trunc_len == 0) { 4282 /* we are supposed to have all of it */ 4283 if (at > chlen) { 4284 /* corrupt skip it */ 4285 SCTP_STAT_INCR(sctps_pdrpcrupt); 4286 break; 4287 } 4288 } else { 4289 /* is there enough of it left ? */ 4290 if (desc.chunk_type == SCTP_DATA) { 4291 if (chlen < (sizeof(struct sctp_data_chunk) + 4292 sizeof(desc.data_bytes))) { 4293 break; 4294 } 4295 } else { 4296 if (chlen < sizeof(struct sctp_chunkhdr)) { 4297 break; 4298 } 4299 } 4300 } 4301 if (desc.chunk_type == SCTP_DATA) { 4302 /* can we get out the tsn? */ 4303 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4304 SCTP_STAT_INCR(sctps_pdrpmbda); 4305 4306 if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) { 4307 /* yep */ 4308 struct sctp_data_chunk *dcp; 4309 uint8_t *ddp; 4310 unsigned int iii; 4311 4312 dcp = (struct sctp_data_chunk *)ch; 4313 ddp = (uint8_t *) (dcp + 1); 4314 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) { 4315 desc.data_bytes[iii] = ddp[iii]; 4316 } 4317 desc.tsn_ifany = dcp->dp.tsn; 4318 } else { 4319 /* nope we are done. */ 4320 SCTP_STAT_INCR(sctps_pdrpnedat); 4321 break; 4322 } 4323 } else { 4324 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4325 SCTP_STAT_INCR(sctps_pdrpmbct); 4326 } 4327 4328 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) { 4329 SCTP_STAT_INCR(sctps_pdrppdbrk); 4330 break; 4331 } 4332 if (SCTP_SIZE32(at) > chlen) { 4333 break; 4334 } 4335 chlen -= SCTP_SIZE32(at); 4336 if (chlen < sizeof(struct sctp_chunkhdr)) { 4337 /* done, none left */ 4338 break; 4339 } 4340 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at)); 4341 } 4342 /* Now update any rwnd --- possibly */ 4343 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) { 4344 /* From a peer, we get a rwnd report */ 4345 uint32_t a_rwnd; 4346 4347 SCTP_STAT_INCR(sctps_pdrpfehos); 4348 4349 bottle_bw = ntohl(cp->bottle_bw); 4350 on_queue = ntohl(cp->current_onq); 4351 if (bottle_bw && on_queue) { 4352 /* a rwnd report is in here */ 4353 if (bottle_bw > on_queue) 4354 a_rwnd = bottle_bw - on_queue; 4355 else 4356 a_rwnd = 0; 4357 4358 if (a_rwnd == 0) 4359 stcb->asoc.peers_rwnd = 0; 4360 else { 4361 if (a_rwnd > stcb->asoc.total_flight) { 4362 stcb->asoc.peers_rwnd = 4363 a_rwnd - stcb->asoc.total_flight; 4364 } else { 4365 stcb->asoc.peers_rwnd = 0; 4366 } 4367 if (stcb->asoc.peers_rwnd < 4368 stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 4369 /* SWS sender side engages */ 4370 stcb->asoc.peers_rwnd = 0; 4371 } 4372 } 4373 } 4374 } else { 4375 SCTP_STAT_INCR(sctps_pdrpfmbox); 4376 } 4377 4378 /* now middle boxes in sat networks get a cwnd bump */ 4379 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) && 4380 (stcb->asoc.sat_t3_loss_recovery == 0) && 4381 (stcb->asoc.sat_network)) { 4382 /* 4383 * This is debateable but for sat networks it makes sense 4384 * Note if a T3 timer has went off, we will prohibit any 4385 * changes to cwnd until we exit the t3 loss recovery. 4386 */ 4387 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb, 4388 net, cp, &bottle_bw, &on_queue); 4389 } 4390 } 4391 4392 /* 4393 * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to 4394 * still contain IP/SCTP header - stcb: is the tcb found for this packet - 4395 * offset: offset into the mbuf chain to first chunkhdr - length: is the 4396 * length of the complete packet outputs: - length: modified to remaining 4397 * length after control processing - netp: modified to new sctp_nets after 4398 * cookie-echo processing - return NULL to discard the packet (ie. no asoc, 4399 * bad packet,...) otherwise return the tcb for this packet 4400 */ 4401 #ifdef __GNUC__ 4402 __attribute__((noinline)) 4403 #endif 4404 static struct sctp_tcb * 4405 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length, 4406 struct sockaddr *src, struct sockaddr *dst, 4407 struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp, 4408 struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen, 4409 uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum, 4410 uint32_t vrf_id, uint16_t port) 4411 { 4412 struct sctp_association *asoc; 4413 struct mbuf *op_err; 4414 char msg[SCTP_DIAG_INFO_LEN]; 4415 uint32_t vtag_in; 4416 int num_chunks = 0; /* number of control chunks processed */ 4417 uint32_t chk_length; 4418 int ret; 4419 int abort_no_unlock = 0; 4420 int ecne_seen = 0; 4421 4422 /* 4423 * How big should this be, and should it be alloc'd? Lets try the 4424 * d-mtu-ceiling for now (2k) and that should hopefully work ... 4425 * until we get into jumbo grams and such.. 4426 */ 4427 uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE]; 4428 struct sctp_tcb *locked_tcb = stcb; 4429 int got_auth = 0; 4430 uint32_t auth_offset = 0, auth_len = 0; 4431 int auth_skipped = 0; 4432 int asconf_cnt = 0; 4433 4434 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4435 struct socket *so; 4436 4437 #endif 4438 4439 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n", 4440 iphlen, *offset, length, (void *)stcb); 4441 4442 /* validate chunk header length... */ 4443 if (ntohs(ch->chunk_length) < sizeof(*ch)) { 4444 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n", 4445 ntohs(ch->chunk_length)); 4446 if (locked_tcb) { 4447 SCTP_TCB_UNLOCK(locked_tcb); 4448 } 4449 return (NULL); 4450 } 4451 /* 4452 * validate the verification tag 4453 */ 4454 vtag_in = ntohl(sh->v_tag); 4455 4456 if (locked_tcb) { 4457 SCTP_TCB_LOCK_ASSERT(locked_tcb); 4458 } 4459 if (ch->chunk_type == SCTP_INITIATION) { 4460 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n", 4461 ntohs(ch->chunk_length), vtag_in); 4462 if (vtag_in != 0) { 4463 /* protocol error- silently discard... */ 4464 SCTP_STAT_INCR(sctps_badvtag); 4465 if (locked_tcb) { 4466 SCTP_TCB_UNLOCK(locked_tcb); 4467 } 4468 return (NULL); 4469 } 4470 } else if (ch->chunk_type != SCTP_COOKIE_ECHO) { 4471 /* 4472 * If there is no stcb, skip the AUTH chunk and process 4473 * later after a stcb is found (to validate the lookup was 4474 * valid. 4475 */ 4476 if ((ch->chunk_type == SCTP_AUTHENTICATION) && 4477 (stcb == NULL) && 4478 (inp->auth_supported == 1)) { 4479 /* save this chunk for later processing */ 4480 auth_skipped = 1; 4481 auth_offset = *offset; 4482 auth_len = ntohs(ch->chunk_length); 4483 4484 /* (temporarily) move past this chunk */ 4485 *offset += SCTP_SIZE32(auth_len); 4486 if (*offset >= length) { 4487 /* no more data left in the mbuf chain */ 4488 *offset = length; 4489 if (locked_tcb) { 4490 SCTP_TCB_UNLOCK(locked_tcb); 4491 } 4492 return (NULL); 4493 } 4494 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4495 sizeof(struct sctp_chunkhdr), chunk_buf); 4496 } 4497 if (ch == NULL) { 4498 /* Help */ 4499 *offset = length; 4500 if (locked_tcb) { 4501 SCTP_TCB_UNLOCK(locked_tcb); 4502 } 4503 return (NULL); 4504 } 4505 if (ch->chunk_type == SCTP_COOKIE_ECHO) { 4506 goto process_control_chunks; 4507 } 4508 /* 4509 * first check if it's an ASCONF with an unknown src addr we 4510 * need to look inside to find the association 4511 */ 4512 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) { 4513 struct sctp_chunkhdr *asconf_ch = ch; 4514 uint32_t asconf_offset = 0, asconf_len = 0; 4515 4516 /* inp's refcount may be reduced */ 4517 SCTP_INP_INCR_REF(inp); 4518 4519 asconf_offset = *offset; 4520 do { 4521 asconf_len = ntohs(asconf_ch->chunk_length); 4522 if (asconf_len < sizeof(struct sctp_asconf_paramhdr)) 4523 break; 4524 stcb = sctp_findassociation_ep_asconf(m, 4525 *offset, 4526 dst, 4527 sh, &inp, netp, vrf_id); 4528 if (stcb != NULL) 4529 break; 4530 asconf_offset += SCTP_SIZE32(asconf_len); 4531 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset, 4532 sizeof(struct sctp_chunkhdr), chunk_buf); 4533 } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF); 4534 if (stcb == NULL) { 4535 /* 4536 * reduce inp's refcount if not reduced in 4537 * sctp_findassociation_ep_asconf(). 4538 */ 4539 SCTP_INP_DECR_REF(inp); 4540 } else { 4541 locked_tcb = stcb; 4542 } 4543 4544 /* now go back and verify any auth chunk to be sure */ 4545 if (auth_skipped && (stcb != NULL)) { 4546 struct sctp_auth_chunk *auth; 4547 4548 auth = (struct sctp_auth_chunk *) 4549 sctp_m_getptr(m, auth_offset, 4550 auth_len, chunk_buf); 4551 got_auth = 1; 4552 auth_skipped = 0; 4553 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, 4554 auth_offset)) { 4555 /* auth HMAC failed so dump it */ 4556 *offset = length; 4557 if (locked_tcb) { 4558 SCTP_TCB_UNLOCK(locked_tcb); 4559 } 4560 return (NULL); 4561 } else { 4562 /* remaining chunks are HMAC checked */ 4563 stcb->asoc.authenticated = 1; 4564 } 4565 } 4566 } 4567 if (stcb == NULL) { 4568 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__); 4569 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4570 msg); 4571 /* no association, so it's out of the blue... */ 4572 sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, op_err, 4573 mflowtype, mflowid, inp->fibnum, 4574 vrf_id, port); 4575 *offset = length; 4576 if (locked_tcb) { 4577 SCTP_TCB_UNLOCK(locked_tcb); 4578 } 4579 return (NULL); 4580 } 4581 asoc = &stcb->asoc; 4582 /* ABORT and SHUTDOWN can use either v_tag... */ 4583 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) || 4584 (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) || 4585 (ch->chunk_type == SCTP_PACKET_DROPPED)) { 4586 /* Take the T-bit always into account. */ 4587 if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) && 4588 (vtag_in == asoc->my_vtag)) || 4589 (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) && 4590 (vtag_in == asoc->peer_vtag))) { 4591 /* this is valid */ 4592 } else { 4593 /* drop this packet... */ 4594 SCTP_STAT_INCR(sctps_badvtag); 4595 if (locked_tcb) { 4596 SCTP_TCB_UNLOCK(locked_tcb); 4597 } 4598 return (NULL); 4599 } 4600 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 4601 if (vtag_in != asoc->my_vtag) { 4602 /* 4603 * this could be a stale SHUTDOWN-ACK or the 4604 * peer never got the SHUTDOWN-COMPLETE and 4605 * is still hung; we have started a new asoc 4606 * but it won't complete until the shutdown 4607 * is completed 4608 */ 4609 if (locked_tcb) { 4610 SCTP_TCB_UNLOCK(locked_tcb); 4611 } 4612 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__); 4613 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4614 msg); 4615 sctp_handle_ootb(m, iphlen, *offset, src, dst, 4616 sh, inp, op_err, 4617 mflowtype, mflowid, fibnum, 4618 vrf_id, port); 4619 return (NULL); 4620 } 4621 } else { 4622 /* for all other chunks, vtag must match */ 4623 if (vtag_in != asoc->my_vtag) { 4624 /* invalid vtag... */ 4625 SCTPDBG(SCTP_DEBUG_INPUT3, 4626 "invalid vtag: %xh, expect %xh\n", 4627 vtag_in, asoc->my_vtag); 4628 SCTP_STAT_INCR(sctps_badvtag); 4629 if (locked_tcb) { 4630 SCTP_TCB_UNLOCK(locked_tcb); 4631 } 4632 *offset = length; 4633 return (NULL); 4634 } 4635 } 4636 } /* end if !SCTP_COOKIE_ECHO */ 4637 /* 4638 * process all control chunks... 4639 */ 4640 if (((ch->chunk_type == SCTP_SELECTIVE_ACK) || 4641 (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) || 4642 (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) && 4643 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) { 4644 /* implied cookie-ack.. we must have lost the ack */ 4645 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4646 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4647 stcb->asoc.overall_error_count, 4648 0, 4649 SCTP_FROM_SCTP_INPUT, 4650 __LINE__); 4651 } 4652 stcb->asoc.overall_error_count = 0; 4653 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, 4654 *netp); 4655 } 4656 process_control_chunks: 4657 while (IS_SCTP_CONTROL(ch)) { 4658 /* validate chunk length */ 4659 chk_length = ntohs(ch->chunk_length); 4660 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n", 4661 ch->chunk_type, chk_length); 4662 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length); 4663 if (chk_length < sizeof(*ch) || 4664 (*offset + (int)chk_length) > length) { 4665 *offset = length; 4666 if (locked_tcb) { 4667 SCTP_TCB_UNLOCK(locked_tcb); 4668 } 4669 return (NULL); 4670 } 4671 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks); 4672 /* 4673 * INIT-ACK only gets the init ack "header" portion only 4674 * because we don't have to process the peer's COOKIE. All 4675 * others get a complete chunk. 4676 */ 4677 if ((ch->chunk_type == SCTP_INITIATION_ACK) || 4678 (ch->chunk_type == SCTP_INITIATION)) { 4679 /* get an init-ack chunk */ 4680 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4681 sizeof(struct sctp_init_ack_chunk), chunk_buf); 4682 if (ch == NULL) { 4683 *offset = length; 4684 if (locked_tcb) { 4685 SCTP_TCB_UNLOCK(locked_tcb); 4686 } 4687 return (NULL); 4688 } 4689 } else { 4690 /* For cookies and all other chunks. */ 4691 if (chk_length > sizeof(chunk_buf)) { 4692 /* 4693 * use just the size of the chunk buffer so 4694 * the front part of our chunks fit in 4695 * contiguous space up to the chunk buffer 4696 * size (508 bytes). For chunks that need to 4697 * get more than that they must use the 4698 * sctp_m_getptr() function or other means 4699 * (e.g. know how to parse mbuf chains). 4700 * Cookies do this already. 4701 */ 4702 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4703 (sizeof(chunk_buf) - 4), 4704 chunk_buf); 4705 if (ch == NULL) { 4706 *offset = length; 4707 if (locked_tcb) { 4708 SCTP_TCB_UNLOCK(locked_tcb); 4709 } 4710 return (NULL); 4711 } 4712 } else { 4713 /* We can fit it all */ 4714 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4715 chk_length, chunk_buf); 4716 if (ch == NULL) { 4717 SCTP_PRINTF("sctp_process_control: Can't get the all data....\n"); 4718 *offset = length; 4719 if (locked_tcb) { 4720 SCTP_TCB_UNLOCK(locked_tcb); 4721 } 4722 return (NULL); 4723 } 4724 } 4725 } 4726 num_chunks++; 4727 /* Save off the last place we got a control from */ 4728 if (stcb != NULL) { 4729 if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) { 4730 /* 4731 * allow last_control to be NULL if 4732 * ASCONF... ASCONF processing will find the 4733 * right net later 4734 */ 4735 if ((netp != NULL) && (*netp != NULL)) 4736 stcb->asoc.last_control_chunk_from = *netp; 4737 } 4738 } 4739 #ifdef SCTP_AUDITING_ENABLED 4740 sctp_audit_log(0xB0, ch->chunk_type); 4741 #endif 4742 4743 /* check to see if this chunk required auth, but isn't */ 4744 if ((stcb != NULL) && 4745 (stcb->asoc.auth_supported == 1) && 4746 sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) && 4747 !stcb->asoc.authenticated) { 4748 /* "silently" ignore */ 4749 SCTP_STAT_INCR(sctps_recvauthmissing); 4750 goto next_chunk; 4751 } 4752 switch (ch->chunk_type) { 4753 case SCTP_INITIATION: 4754 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n"); 4755 /* The INIT chunk must be the only chunk. */ 4756 if ((num_chunks > 1) || 4757 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4758 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4759 "INIT not the only chunk"); 4760 sctp_abort_association(inp, stcb, m, iphlen, 4761 src, dst, sh, op_err, 4762 mflowtype, mflowid, 4763 vrf_id, port); 4764 *offset = length; 4765 return (NULL); 4766 } 4767 /* Honor our resource limit. */ 4768 if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) { 4769 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 4770 sctp_abort_association(inp, stcb, m, iphlen, 4771 src, dst, sh, op_err, 4772 mflowtype, mflowid, 4773 vrf_id, port); 4774 *offset = length; 4775 return (NULL); 4776 } 4777 sctp_handle_init(m, iphlen, *offset, src, dst, sh, 4778 (struct sctp_init_chunk *)ch, inp, 4779 stcb, &abort_no_unlock, 4780 mflowtype, mflowid, 4781 vrf_id, port); 4782 *offset = length; 4783 if ((!abort_no_unlock) && (locked_tcb)) { 4784 SCTP_TCB_UNLOCK(locked_tcb); 4785 } 4786 return (NULL); 4787 break; 4788 case SCTP_PAD_CHUNK: 4789 break; 4790 case SCTP_INITIATION_ACK: 4791 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT-ACK\n"); 4792 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4793 /* We are not interested anymore */ 4794 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4795 ; 4796 } else { 4797 if (locked_tcb != stcb) { 4798 /* Very unlikely */ 4799 SCTP_TCB_UNLOCK(locked_tcb); 4800 } 4801 *offset = length; 4802 if (stcb) { 4803 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4804 so = SCTP_INP_SO(inp); 4805 atomic_add_int(&stcb->asoc.refcnt, 1); 4806 SCTP_TCB_UNLOCK(stcb); 4807 SCTP_SOCKET_LOCK(so, 1); 4808 SCTP_TCB_LOCK(stcb); 4809 atomic_subtract_int(&stcb->asoc.refcnt, 1); 4810 #endif 4811 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 4812 SCTP_FROM_SCTP_INPUT + SCTP_LOC_29); 4813 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4814 SCTP_SOCKET_UNLOCK(so, 1); 4815 #endif 4816 } 4817 return (NULL); 4818 } 4819 } 4820 /* The INIT-ACK chunk must be the only chunk. */ 4821 if ((num_chunks > 1) || 4822 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4823 *offset = length; 4824 if (locked_tcb) { 4825 SCTP_TCB_UNLOCK(locked_tcb); 4826 } 4827 return (NULL); 4828 } 4829 if ((netp) && (*netp)) { 4830 ret = sctp_handle_init_ack(m, iphlen, *offset, 4831 src, dst, sh, 4832 (struct sctp_init_ack_chunk *)ch, 4833 stcb, *netp, 4834 &abort_no_unlock, 4835 mflowtype, mflowid, 4836 vrf_id); 4837 } else { 4838 ret = -1; 4839 } 4840 *offset = length; 4841 if (abort_no_unlock) { 4842 return (NULL); 4843 } 4844 /* 4845 * Special case, I must call the output routine to 4846 * get the cookie echoed 4847 */ 4848 if ((stcb != NULL) && (ret == 0)) { 4849 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 4850 } 4851 if (locked_tcb) { 4852 SCTP_TCB_UNLOCK(locked_tcb); 4853 } 4854 return (NULL); 4855 break; 4856 case SCTP_SELECTIVE_ACK: 4857 { 4858 struct sctp_sack_chunk *sack; 4859 int abort_now = 0; 4860 uint32_t a_rwnd, cum_ack; 4861 uint16_t num_seg, num_dup; 4862 uint8_t flags; 4863 int offset_seg, offset_dup; 4864 4865 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK\n"); 4866 SCTP_STAT_INCR(sctps_recvsacks); 4867 if (stcb == NULL) { 4868 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing SACK chunk\n"); 4869 break; 4870 } 4871 if (chk_length < sizeof(struct sctp_sack_chunk)) { 4872 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n"); 4873 break; 4874 } 4875 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4876 /*- 4877 * If we have sent a shutdown-ack, we will pay no 4878 * attention to a sack sent in to us since 4879 * we don't care anymore. 4880 */ 4881 break; 4882 } 4883 sack = (struct sctp_sack_chunk *)ch; 4884 flags = ch->chunk_flags; 4885 cum_ack = ntohl(sack->sack.cum_tsn_ack); 4886 num_seg = ntohs(sack->sack.num_gap_ack_blks); 4887 num_dup = ntohs(sack->sack.num_dup_tsns); 4888 a_rwnd = (uint32_t) ntohl(sack->sack.a_rwnd); 4889 if (sizeof(struct sctp_sack_chunk) + 4890 num_seg * sizeof(struct sctp_gap_ack_block) + 4891 num_dup * sizeof(uint32_t) != chk_length) { 4892 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n"); 4893 break; 4894 } 4895 offset_seg = *offset + sizeof(struct sctp_sack_chunk); 4896 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 4897 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n", 4898 cum_ack, num_seg, a_rwnd); 4899 stcb->asoc.seen_a_sack_this_pkt = 1; 4900 if ((stcb->asoc.pr_sctp_cnt == 0) && 4901 (num_seg == 0) && 4902 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 4903 (stcb->asoc.saw_sack_with_frags == 0) && 4904 (stcb->asoc.saw_sack_with_nr_frags == 0) && 4905 (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) 4906 ) { 4907 /* 4908 * We have a SIMPLE sack having no 4909 * prior segments and data on sent 4910 * queue to be acked.. Use the 4911 * faster path sack processing. We 4912 * also allow window update sacks 4913 * with no missing segments to go 4914 * this way too. 4915 */ 4916 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, &abort_now, ecne_seen); 4917 } else { 4918 if (netp && *netp) 4919 sctp_handle_sack(m, offset_seg, offset_dup, stcb, 4920 num_seg, 0, num_dup, &abort_now, flags, 4921 cum_ack, a_rwnd, ecne_seen); 4922 } 4923 if (abort_now) { 4924 /* ABORT signal from sack processing */ 4925 *offset = length; 4926 return (NULL); 4927 } 4928 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 4929 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 4930 (stcb->asoc.stream_queue_cnt == 0)) { 4931 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 4932 } 4933 } 4934 break; 4935 /* 4936 * EY - nr_sack: If the received chunk is an 4937 * nr_sack chunk 4938 */ 4939 case SCTP_NR_SELECTIVE_ACK: 4940 { 4941 struct sctp_nr_sack_chunk *nr_sack; 4942 int abort_now = 0; 4943 uint32_t a_rwnd, cum_ack; 4944 uint16_t num_seg, num_nr_seg, num_dup; 4945 uint8_t flags; 4946 int offset_seg, offset_dup; 4947 4948 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK\n"); 4949 SCTP_STAT_INCR(sctps_recvsacks); 4950 if (stcb == NULL) { 4951 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing NR-SACK chunk\n"); 4952 break; 4953 } 4954 if (stcb->asoc.nrsack_supported == 0) { 4955 goto unknown_chunk; 4956 } 4957 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) { 4958 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR-SACK chunk, too small\n"); 4959 break; 4960 } 4961 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4962 /*- 4963 * If we have sent a shutdown-ack, we will pay no 4964 * attention to a sack sent in to us since 4965 * we don't care anymore. 4966 */ 4967 break; 4968 } 4969 nr_sack = (struct sctp_nr_sack_chunk *)ch; 4970 flags = ch->chunk_flags; 4971 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack); 4972 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks); 4973 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks); 4974 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns); 4975 a_rwnd = (uint32_t) ntohl(nr_sack->nr_sack.a_rwnd); 4976 if (sizeof(struct sctp_nr_sack_chunk) + 4977 (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) + 4978 num_dup * sizeof(uint32_t) != chk_length) { 4979 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n"); 4980 break; 4981 } 4982 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk); 4983 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 4984 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n", 4985 cum_ack, num_seg, a_rwnd); 4986 stcb->asoc.seen_a_sack_this_pkt = 1; 4987 if ((stcb->asoc.pr_sctp_cnt == 0) && 4988 (num_seg == 0) && (num_nr_seg == 0) && 4989 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 4990 (stcb->asoc.saw_sack_with_frags == 0) && 4991 (stcb->asoc.saw_sack_with_nr_frags == 0) && 4992 (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) { 4993 /* 4994 * We have a SIMPLE sack having no 4995 * prior segments and data on sent 4996 * queue to be acked. Use the faster 4997 * path sack processing. We also 4998 * allow window update sacks with no 4999 * missing segments to go this way 5000 * too. 5001 */ 5002 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, 5003 &abort_now, ecne_seen); 5004 } else { 5005 if (netp && *netp) 5006 sctp_handle_sack(m, offset_seg, offset_dup, stcb, 5007 num_seg, num_nr_seg, num_dup, &abort_now, flags, 5008 cum_ack, a_rwnd, ecne_seen); 5009 } 5010 if (abort_now) { 5011 /* ABORT signal from sack processing */ 5012 *offset = length; 5013 return (NULL); 5014 } 5015 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 5016 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 5017 (stcb->asoc.stream_queue_cnt == 0)) { 5018 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 5019 } 5020 } 5021 break; 5022 5023 case SCTP_HEARTBEAT_REQUEST: 5024 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n"); 5025 if ((stcb) && netp && *netp) { 5026 SCTP_STAT_INCR(sctps_recvheartbeat); 5027 sctp_send_heartbeat_ack(stcb, m, *offset, 5028 chk_length, *netp); 5029 5030 /* He's alive so give him credit */ 5031 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5032 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5033 stcb->asoc.overall_error_count, 5034 0, 5035 SCTP_FROM_SCTP_INPUT, 5036 __LINE__); 5037 } 5038 stcb->asoc.overall_error_count = 0; 5039 } 5040 break; 5041 case SCTP_HEARTBEAT_ACK: 5042 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT-ACK\n"); 5043 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) { 5044 /* Its not ours */ 5045 *offset = length; 5046 if (locked_tcb) { 5047 SCTP_TCB_UNLOCK(locked_tcb); 5048 } 5049 return (NULL); 5050 } 5051 /* He's alive so give him credit */ 5052 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5053 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5054 stcb->asoc.overall_error_count, 5055 0, 5056 SCTP_FROM_SCTP_INPUT, 5057 __LINE__); 5058 } 5059 stcb->asoc.overall_error_count = 0; 5060 SCTP_STAT_INCR(sctps_recvheartbeatack); 5061 if (netp && *netp) 5062 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch, 5063 stcb, *netp); 5064 break; 5065 case SCTP_ABORT_ASSOCIATION: 5066 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n", 5067 (void *)stcb); 5068 if ((stcb) && netp && *netp) 5069 sctp_handle_abort((struct sctp_abort_chunk *)ch, 5070 stcb, *netp); 5071 *offset = length; 5072 return (NULL); 5073 break; 5074 case SCTP_SHUTDOWN: 5075 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n", 5076 (void *)stcb); 5077 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) { 5078 *offset = length; 5079 if (locked_tcb) { 5080 SCTP_TCB_UNLOCK(locked_tcb); 5081 } 5082 return (NULL); 5083 } 5084 if (netp && *netp) { 5085 int abort_flag = 0; 5086 5087 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch, 5088 stcb, *netp, &abort_flag); 5089 if (abort_flag) { 5090 *offset = length; 5091 return (NULL); 5092 } 5093 } 5094 break; 5095 case SCTP_SHUTDOWN_ACK: 5096 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-ACK, stcb %p\n", (void *)stcb); 5097 if ((stcb) && (netp) && (*netp)) 5098 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp); 5099 *offset = length; 5100 return (NULL); 5101 break; 5102 5103 case SCTP_OPERATION_ERROR: 5104 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP-ERR\n"); 5105 if ((stcb) && netp && *netp && sctp_handle_error(ch, stcb, *netp) < 0) { 5106 *offset = length; 5107 return (NULL); 5108 } 5109 break; 5110 case SCTP_COOKIE_ECHO: 5111 SCTPDBG(SCTP_DEBUG_INPUT3, 5112 "SCTP_COOKIE-ECHO, stcb %p\n", (void *)stcb); 5113 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 5114 ; 5115 } else { 5116 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5117 /* We are not interested anymore */ 5118 abend: 5119 if (stcb) { 5120 SCTP_TCB_UNLOCK(stcb); 5121 } 5122 *offset = length; 5123 return (NULL); 5124 } 5125 } 5126 /* 5127 * First are we accepting? We do this again here 5128 * since it is possible that a previous endpoint WAS 5129 * listening responded to a INIT-ACK and then 5130 * closed. We opened and bound.. and are now no 5131 * longer listening. 5132 */ 5133 5134 if ((stcb == NULL) && (inp->sctp_socket->so_qlen >= inp->sctp_socket->so_qlimit)) { 5135 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 5136 (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) { 5137 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 5138 sctp_abort_association(inp, stcb, m, iphlen, 5139 src, dst, sh, op_err, 5140 mflowtype, mflowid, 5141 vrf_id, port); 5142 } 5143 *offset = length; 5144 return (NULL); 5145 } else { 5146 struct mbuf *ret_buf; 5147 struct sctp_inpcb *linp; 5148 5149 if (stcb) { 5150 linp = NULL; 5151 } else { 5152 linp = inp; 5153 } 5154 5155 if (linp) { 5156 SCTP_ASOC_CREATE_LOCK(linp); 5157 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 5158 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) { 5159 SCTP_ASOC_CREATE_UNLOCK(linp); 5160 goto abend; 5161 } 5162 } 5163 if (netp) { 5164 ret_buf = 5165 sctp_handle_cookie_echo(m, iphlen, 5166 *offset, 5167 src, dst, 5168 sh, 5169 (struct sctp_cookie_echo_chunk *)ch, 5170 &inp, &stcb, netp, 5171 auth_skipped, 5172 auth_offset, 5173 auth_len, 5174 &locked_tcb, 5175 mflowtype, 5176 mflowid, 5177 vrf_id, 5178 port); 5179 } else { 5180 ret_buf = NULL; 5181 } 5182 if (linp) { 5183 SCTP_ASOC_CREATE_UNLOCK(linp); 5184 } 5185 if (ret_buf == NULL) { 5186 if (locked_tcb) { 5187 SCTP_TCB_UNLOCK(locked_tcb); 5188 } 5189 SCTPDBG(SCTP_DEBUG_INPUT3, 5190 "GAK, null buffer\n"); 5191 *offset = length; 5192 return (NULL); 5193 } 5194 /* if AUTH skipped, see if it verified... */ 5195 if (auth_skipped) { 5196 got_auth = 1; 5197 auth_skipped = 0; 5198 } 5199 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) { 5200 /* 5201 * Restart the timer if we have 5202 * pending data 5203 */ 5204 struct sctp_tmit_chunk *chk; 5205 5206 chk = TAILQ_FIRST(&stcb->asoc.sent_queue); 5207 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 5208 } 5209 } 5210 break; 5211 case SCTP_COOKIE_ACK: 5212 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE-ACK, stcb %p\n", (void *)stcb); 5213 if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) { 5214 if (locked_tcb) { 5215 SCTP_TCB_UNLOCK(locked_tcb); 5216 } 5217 return (NULL); 5218 } 5219 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5220 /* We are not interested anymore */ 5221 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 5222 ; 5223 } else if (stcb) { 5224 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5225 so = SCTP_INP_SO(inp); 5226 atomic_add_int(&stcb->asoc.refcnt, 1); 5227 SCTP_TCB_UNLOCK(stcb); 5228 SCTP_SOCKET_LOCK(so, 1); 5229 SCTP_TCB_LOCK(stcb); 5230 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5231 #endif 5232 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 5233 SCTP_FROM_SCTP_INPUT + SCTP_LOC_30); 5234 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5235 SCTP_SOCKET_UNLOCK(so, 1); 5236 #endif 5237 *offset = length; 5238 return (NULL); 5239 } 5240 } 5241 /* He's alive so give him credit */ 5242 if ((stcb) && netp && *netp) { 5243 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5244 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5245 stcb->asoc.overall_error_count, 5246 0, 5247 SCTP_FROM_SCTP_INPUT, 5248 __LINE__); 5249 } 5250 stcb->asoc.overall_error_count = 0; 5251 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp); 5252 } 5253 break; 5254 case SCTP_ECN_ECHO: 5255 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-ECHO\n"); 5256 /* He's alive so give him credit */ 5257 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) { 5258 /* Its not ours */ 5259 if (locked_tcb) { 5260 SCTP_TCB_UNLOCK(locked_tcb); 5261 } 5262 *offset = length; 5263 return (NULL); 5264 } 5265 if (stcb) { 5266 if (stcb->asoc.ecn_supported == 0) { 5267 goto unknown_chunk; 5268 } 5269 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5270 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5271 stcb->asoc.overall_error_count, 5272 0, 5273 SCTP_FROM_SCTP_INPUT, 5274 __LINE__); 5275 } 5276 stcb->asoc.overall_error_count = 0; 5277 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, 5278 stcb); 5279 ecne_seen = 1; 5280 } 5281 break; 5282 case SCTP_ECN_CWR: 5283 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-CWR\n"); 5284 /* He's alive so give him credit */ 5285 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) { 5286 /* Its not ours */ 5287 if (locked_tcb) { 5288 SCTP_TCB_UNLOCK(locked_tcb); 5289 } 5290 *offset = length; 5291 return (NULL); 5292 } 5293 if (stcb) { 5294 if (stcb->asoc.ecn_supported == 0) { 5295 goto unknown_chunk; 5296 } 5297 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5298 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5299 stcb->asoc.overall_error_count, 5300 0, 5301 SCTP_FROM_SCTP_INPUT, 5302 __LINE__); 5303 } 5304 stcb->asoc.overall_error_count = 0; 5305 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp); 5306 } 5307 break; 5308 case SCTP_SHUTDOWN_COMPLETE: 5309 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-COMPLETE, stcb %p\n", (void *)stcb); 5310 /* must be first and only chunk */ 5311 if ((num_chunks > 1) || 5312 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 5313 *offset = length; 5314 if (locked_tcb) { 5315 SCTP_TCB_UNLOCK(locked_tcb); 5316 } 5317 return (NULL); 5318 } 5319 if ((stcb) && netp && *netp) { 5320 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch, 5321 stcb, *netp); 5322 } 5323 *offset = length; 5324 return (NULL); 5325 break; 5326 case SCTP_ASCONF: 5327 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n"); 5328 /* He's alive so give him credit */ 5329 if (stcb) { 5330 if (stcb->asoc.asconf_supported == 0) { 5331 goto unknown_chunk; 5332 } 5333 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5334 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5335 stcb->asoc.overall_error_count, 5336 0, 5337 SCTP_FROM_SCTP_INPUT, 5338 __LINE__); 5339 } 5340 stcb->asoc.overall_error_count = 0; 5341 sctp_handle_asconf(m, *offset, src, 5342 (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0); 5343 asconf_cnt++; 5344 } 5345 break; 5346 case SCTP_ASCONF_ACK: 5347 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF-ACK\n"); 5348 if (chk_length < sizeof(struct sctp_asconf_ack_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) && netp && *netp) { 5357 if (stcb->asoc.asconf_supported == 0) { 5358 goto unknown_chunk; 5359 } 5360 /* He's alive so give him credit */ 5361 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5362 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5363 stcb->asoc.overall_error_count, 5364 0, 5365 SCTP_FROM_SCTP_INPUT, 5366 __LINE__); 5367 } 5368 stcb->asoc.overall_error_count = 0; 5369 sctp_handle_asconf_ack(m, *offset, 5370 (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock); 5371 if (abort_no_unlock) 5372 return (NULL); 5373 } 5374 break; 5375 case SCTP_FORWARD_CUM_TSN: 5376 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD-TSN\n"); 5377 if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) { 5378 /* Its not ours */ 5379 if (locked_tcb) { 5380 SCTP_TCB_UNLOCK(locked_tcb); 5381 } 5382 *offset = length; 5383 return (NULL); 5384 } 5385 /* He's alive so give him credit */ 5386 if (stcb) { 5387 int abort_flag = 0; 5388 5389 if (stcb->asoc.prsctp_supported == 0) { 5390 goto unknown_chunk; 5391 } 5392 stcb->asoc.overall_error_count = 0; 5393 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5394 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5395 stcb->asoc.overall_error_count, 5396 0, 5397 SCTP_FROM_SCTP_INPUT, 5398 __LINE__); 5399 } 5400 *fwd_tsn_seen = 1; 5401 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5402 /* We are not interested anymore */ 5403 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5404 so = SCTP_INP_SO(inp); 5405 atomic_add_int(&stcb->asoc.refcnt, 1); 5406 SCTP_TCB_UNLOCK(stcb); 5407 SCTP_SOCKET_LOCK(so, 1); 5408 SCTP_TCB_LOCK(stcb); 5409 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5410 #endif 5411 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 5412 SCTP_FROM_SCTP_INPUT + SCTP_LOC_31); 5413 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5414 SCTP_SOCKET_UNLOCK(so, 1); 5415 #endif 5416 *offset = length; 5417 return (NULL); 5418 } 5419 sctp_handle_forward_tsn(stcb, 5420 (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset); 5421 if (abort_flag) { 5422 *offset = length; 5423 return (NULL); 5424 } else { 5425 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5426 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5427 stcb->asoc.overall_error_count, 5428 0, 5429 SCTP_FROM_SCTP_INPUT, 5430 __LINE__); 5431 } 5432 stcb->asoc.overall_error_count = 0; 5433 } 5434 5435 } 5436 break; 5437 case SCTP_STREAM_RESET: 5438 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n"); 5439 if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) { 5440 /* Its not ours */ 5441 if (locked_tcb) { 5442 SCTP_TCB_UNLOCK(locked_tcb); 5443 } 5444 *offset = length; 5445 return (NULL); 5446 } 5447 if (stcb->asoc.reconfig_supported == 0) { 5448 goto unknown_chunk; 5449 } 5450 if (sctp_handle_stream_reset(stcb, m, *offset, ch)) { 5451 /* stop processing */ 5452 *offset = length; 5453 return (NULL); 5454 } 5455 break; 5456 case SCTP_PACKET_DROPPED: 5457 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n"); 5458 /* re-get it all please */ 5459 if (chk_length < sizeof(struct sctp_pktdrop_chunk)) { 5460 /* Its not ours */ 5461 if (locked_tcb) { 5462 SCTP_TCB_UNLOCK(locked_tcb); 5463 } 5464 *offset = length; 5465 return (NULL); 5466 } 5467 if (ch && (stcb) && netp && (*netp)) { 5468 if (stcb->asoc.pktdrop_supported == 0) { 5469 goto unknown_chunk; 5470 } 5471 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch, 5472 stcb, *netp, 5473 min(chk_length, (sizeof(chunk_buf) - 4))); 5474 5475 } 5476 break; 5477 case SCTP_AUTHENTICATION: 5478 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n"); 5479 if (stcb == NULL) { 5480 /* save the first AUTH for later processing */ 5481 if (auth_skipped == 0) { 5482 auth_offset = *offset; 5483 auth_len = chk_length; 5484 auth_skipped = 1; 5485 } 5486 /* skip this chunk (temporarily) */ 5487 goto next_chunk; 5488 } 5489 if (stcb->asoc.auth_supported == 0) { 5490 goto unknown_chunk; 5491 } 5492 if ((chk_length < (sizeof(struct sctp_auth_chunk))) || 5493 (chk_length > (sizeof(struct sctp_auth_chunk) + 5494 SCTP_AUTH_DIGEST_LEN_MAX))) { 5495 /* Its not ours */ 5496 if (locked_tcb) { 5497 SCTP_TCB_UNLOCK(locked_tcb); 5498 } 5499 *offset = length; 5500 return (NULL); 5501 } 5502 if (got_auth == 1) { 5503 /* skip this chunk... it's already auth'd */ 5504 goto next_chunk; 5505 } 5506 got_auth = 1; 5507 if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch, 5508 m, *offset)) { 5509 /* auth HMAC failed so dump the packet */ 5510 *offset = length; 5511 return (stcb); 5512 } else { 5513 /* remaining chunks are HMAC checked */ 5514 stcb->asoc.authenticated = 1; 5515 } 5516 break; 5517 5518 default: 5519 unknown_chunk: 5520 /* it's an unknown chunk! */ 5521 if ((ch->chunk_type & 0x40) && (stcb != NULL)) { 5522 struct mbuf *mm; 5523 struct sctp_paramhdr *phd; 5524 int len; 5525 5526 mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 5527 0, M_NOWAIT, 1, MT_DATA); 5528 if (mm) { 5529 len = min(SCTP_SIZE32(chk_length), (uint32_t) (length - *offset)); 5530 phd = mtod(mm, struct sctp_paramhdr *); 5531 /* 5532 * We cheat and use param type since 5533 * we did not bother to define a 5534 * error cause struct. They are the 5535 * same basic format with different 5536 * names. 5537 */ 5538 phd->param_type = htons(SCTP_CAUSE_UNRECOG_CHUNK); 5539 phd->param_length = htons(len + sizeof(*phd)); 5540 SCTP_BUF_LEN(mm) = sizeof(*phd); 5541 SCTP_BUF_NEXT(mm) = SCTP_M_COPYM(m, *offset, len, M_NOWAIT); 5542 if (SCTP_BUF_NEXT(mm)) { 5543 if (sctp_pad_lastmbuf(SCTP_BUF_NEXT(mm), SCTP_SIZE32(len) - len, NULL) == NULL) { 5544 sctp_m_freem(mm); 5545 } else { 5546 #ifdef SCTP_MBUF_LOGGING 5547 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5548 sctp_log_mbc(SCTP_BUF_NEXT(mm), SCTP_MBUF_ICOPY); 5549 } 5550 #endif 5551 sctp_queue_op_err(stcb, mm); 5552 } 5553 } else { 5554 sctp_m_freem(mm); 5555 } 5556 } 5557 } 5558 if ((ch->chunk_type & 0x80) == 0) { 5559 /* discard this packet */ 5560 *offset = length; 5561 return (stcb); 5562 } /* else skip this bad chunk and continue... */ 5563 break; 5564 } /* switch (ch->chunk_type) */ 5565 5566 5567 next_chunk: 5568 /* get the next chunk */ 5569 *offset += SCTP_SIZE32(chk_length); 5570 if (*offset >= length) { 5571 /* no more data left in the mbuf chain */ 5572 break; 5573 } 5574 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 5575 sizeof(struct sctp_chunkhdr), chunk_buf); 5576 if (ch == NULL) { 5577 if (locked_tcb) { 5578 SCTP_TCB_UNLOCK(locked_tcb); 5579 } 5580 *offset = length; 5581 return (NULL); 5582 } 5583 } /* while */ 5584 5585 if (asconf_cnt > 0 && stcb != NULL) { 5586 sctp_send_asconf_ack(stcb); 5587 } 5588 return (stcb); 5589 } 5590 5591 5592 #ifdef INVARIANTS 5593 #ifdef __GNUC__ 5594 __attribute__((noinline)) 5595 #endif 5596 void 5597 sctp_validate_no_locks(struct sctp_inpcb *inp) 5598 { 5599 struct sctp_tcb *lstcb; 5600 5601 LIST_FOREACH(lstcb, &inp->sctp_asoc_list, sctp_tcblist) { 5602 if (mtx_owned(&lstcb->tcb_mtx)) { 5603 panic("Own lock on stcb at return from input"); 5604 } 5605 } 5606 if (mtx_owned(&inp->inp_create_mtx)) { 5607 panic("Own create lock on inp"); 5608 } 5609 if (mtx_owned(&inp->inp_mtx)) { 5610 panic("Own inp lock on inp"); 5611 } 5612 } 5613 5614 #endif 5615 5616 /* 5617 * common input chunk processing (v4 and v6) 5618 */ 5619 void 5620 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length, 5621 struct sockaddr *src, struct sockaddr *dst, 5622 struct sctphdr *sh, struct sctp_chunkhdr *ch, 5623 #if !defined(SCTP_WITH_NO_CSUM) 5624 uint8_t compute_crc, 5625 #endif 5626 uint8_t ecn_bits, 5627 uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum, 5628 uint32_t vrf_id, uint16_t port) 5629 { 5630 uint32_t high_tsn; 5631 int fwd_tsn_seen = 0, data_processed = 0; 5632 struct mbuf *m = *mm, *op_err; 5633 char msg[SCTP_DIAG_INFO_LEN]; 5634 int un_sent; 5635 int cnt_ctrl_ready = 0; 5636 struct sctp_inpcb *inp = NULL, *inp_decr = NULL; 5637 struct sctp_tcb *stcb = NULL; 5638 struct sctp_nets *net = NULL; 5639 5640 SCTP_STAT_INCR(sctps_recvdatagrams); 5641 #ifdef SCTP_AUDITING_ENABLED 5642 sctp_audit_log(0xE0, 1); 5643 sctp_auditing(0, inp, stcb, net); 5644 #endif 5645 #if !defined(SCTP_WITH_NO_CSUM) 5646 if (compute_crc != 0) { 5647 uint32_t check, calc_check; 5648 5649 check = sh->checksum; 5650 sh->checksum = 0; 5651 calc_check = sctp_calculate_cksum(m, iphlen); 5652 sh->checksum = check; 5653 if (calc_check != check) { 5654 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x m:%p mlen:%d iphlen:%d\n", 5655 calc_check, check, (void *)m, length, iphlen); 5656 stcb = sctp_findassociation_addr(m, offset, src, dst, 5657 sh, ch, &inp, &net, vrf_id); 5658 #if defined(INET) || defined(INET6) 5659 if ((net != NULL) && (port != 0)) { 5660 if (net->port == 0) { 5661 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr)); 5662 } 5663 net->port = port; 5664 } 5665 #endif 5666 if (net != NULL) { 5667 net->flowtype = mflowtype; 5668 net->flowid = mflowid; 5669 } 5670 if ((inp != NULL) && (stcb != NULL)) { 5671 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1); 5672 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED); 5673 } else if ((inp != NULL) && (stcb == NULL)) { 5674 inp_decr = inp; 5675 } 5676 SCTP_STAT_INCR(sctps_badsum); 5677 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors); 5678 goto out; 5679 } 5680 } 5681 #endif 5682 /* Destination port of 0 is illegal, based on RFC4960. */ 5683 if (sh->dest_port == 0) { 5684 SCTP_STAT_INCR(sctps_hdrops); 5685 goto out; 5686 } 5687 stcb = sctp_findassociation_addr(m, offset, src, dst, 5688 sh, ch, &inp, &net, vrf_id); 5689 #if defined(INET) || defined(INET6) 5690 if ((net != NULL) && (port != 0)) { 5691 if (net->port == 0) { 5692 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr)); 5693 } 5694 net->port = port; 5695 } 5696 #endif 5697 if (net != NULL) { 5698 net->flowtype = mflowtype; 5699 net->flowid = mflowid; 5700 } 5701 if (inp == NULL) { 5702 SCTP_STAT_INCR(sctps_noport); 5703 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) { 5704 goto out; 5705 } 5706 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 5707 sctp_send_shutdown_complete2(src, dst, sh, 5708 mflowtype, mflowid, fibnum, 5709 vrf_id, port); 5710 goto out; 5711 } 5712 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) { 5713 goto out; 5714 } 5715 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) { 5716 if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) || 5717 ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) && 5718 (ch->chunk_type != SCTP_INIT))) { 5719 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5720 "Out of the blue"); 5721 sctp_send_abort(m, iphlen, src, dst, 5722 sh, 0, op_err, 5723 mflowtype, mflowid, fibnum, 5724 vrf_id, port); 5725 } 5726 } 5727 goto out; 5728 } else if (stcb == NULL) { 5729 inp_decr = inp; 5730 } 5731 #ifdef IPSEC 5732 /*- 5733 * I very much doubt any of the IPSEC stuff will work but I have no 5734 * idea, so I will leave it in place. 5735 */ 5736 if (inp != NULL) { 5737 switch (dst->sa_family) { 5738 #ifdef INET 5739 case AF_INET: 5740 if (ipsec4_in_reject(m, &inp->ip_inp.inp)) { 5741 IPSECSTAT_INC(ips_in_polvio); 5742 SCTP_STAT_INCR(sctps_hdrops); 5743 goto out; 5744 } 5745 break; 5746 #endif 5747 #ifdef INET6 5748 case AF_INET6: 5749 if (ipsec6_in_reject(m, &inp->ip_inp.inp)) { 5750 IPSEC6STAT_INC(ips_in_polvio); 5751 SCTP_STAT_INCR(sctps_hdrops); 5752 goto out; 5753 } 5754 break; 5755 #endif 5756 default: 5757 break; 5758 } 5759 } 5760 #endif 5761 SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n", 5762 (void *)m, iphlen, offset, length, (void *)stcb); 5763 if (stcb) { 5764 /* always clear this before beginning a packet */ 5765 stcb->asoc.authenticated = 0; 5766 stcb->asoc.seen_a_sack_this_pkt = 0; 5767 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n", 5768 (void *)stcb, stcb->asoc.state); 5769 5770 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) || 5771 (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) { 5772 /*- 5773 * If we hit here, we had a ref count 5774 * up when the assoc was aborted and the 5775 * timer is clearing out the assoc, we should 5776 * NOT respond to any packet.. its OOTB. 5777 */ 5778 SCTP_TCB_UNLOCK(stcb); 5779 stcb = NULL; 5780 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__); 5781 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5782 msg); 5783 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5784 mflowtype, mflowid, inp->fibnum, 5785 vrf_id, port); 5786 goto out; 5787 } 5788 } 5789 if (IS_SCTP_CONTROL(ch)) { 5790 /* process the control portion of the SCTP packet */ 5791 /* sa_ignore NO_NULL_CHK */ 5792 stcb = sctp_process_control(m, iphlen, &offset, length, 5793 src, dst, sh, ch, 5794 inp, stcb, &net, &fwd_tsn_seen, 5795 mflowtype, mflowid, fibnum, 5796 vrf_id, port); 5797 if (stcb) { 5798 /* 5799 * This covers us if the cookie-echo was there and 5800 * it changes our INP. 5801 */ 5802 inp = stcb->sctp_ep; 5803 #if defined(INET) || defined(INET6) 5804 if ((net) && (port)) { 5805 if (net->port == 0) { 5806 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr)); 5807 } 5808 net->port = port; 5809 } 5810 #endif 5811 } 5812 } else { 5813 /* 5814 * no control chunks, so pre-process DATA chunks (these 5815 * checks are taken care of by control processing) 5816 */ 5817 5818 /* 5819 * if DATA only packet, and auth is required, then punt... 5820 * can't have authenticated without any AUTH (control) 5821 * chunks 5822 */ 5823 if ((stcb != NULL) && 5824 (stcb->asoc.auth_supported == 1) && 5825 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) { 5826 /* "silently" ignore */ 5827 SCTP_STAT_INCR(sctps_recvauthmissing); 5828 goto out; 5829 } 5830 if (stcb == NULL) { 5831 /* out of the blue DATA chunk */ 5832 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__); 5833 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5834 msg); 5835 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5836 mflowtype, mflowid, fibnum, 5837 vrf_id, port); 5838 goto out; 5839 } 5840 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) { 5841 /* v_tag mismatch! */ 5842 SCTP_STAT_INCR(sctps_badvtag); 5843 goto out; 5844 } 5845 } 5846 5847 if (stcb == NULL) { 5848 /* 5849 * no valid TCB for this packet, or we found it's a bad 5850 * packet while processing control, or we're done with this 5851 * packet (done or skip rest of data), so we drop it... 5852 */ 5853 goto out; 5854 } 5855 /* 5856 * DATA chunk processing 5857 */ 5858 /* plow through the data chunks while length > offset */ 5859 5860 /* 5861 * Rest should be DATA only. Check authentication state if AUTH for 5862 * DATA is required. 5863 */ 5864 if ((length > offset) && 5865 (stcb != NULL) && 5866 (stcb->asoc.auth_supported == 1) && 5867 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) && 5868 !stcb->asoc.authenticated) { 5869 /* "silently" ignore */ 5870 SCTP_STAT_INCR(sctps_recvauthmissing); 5871 SCTPDBG(SCTP_DEBUG_AUTH1, 5872 "Data chunk requires AUTH, skipped\n"); 5873 goto trigger_send; 5874 } 5875 if (length > offset) { 5876 int retval; 5877 5878 /* 5879 * First check to make sure our state is correct. We would 5880 * not get here unless we really did have a tag, so we don't 5881 * abort if this happens, just dump the chunk silently. 5882 */ 5883 switch (SCTP_GET_STATE(&stcb->asoc)) { 5884 case SCTP_STATE_COOKIE_ECHOED: 5885 /* 5886 * we consider data with valid tags in this state 5887 * shows us the cookie-ack was lost. Imply it was 5888 * there. 5889 */ 5890 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5891 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5892 stcb->asoc.overall_error_count, 5893 0, 5894 SCTP_FROM_SCTP_INPUT, 5895 __LINE__); 5896 } 5897 stcb->asoc.overall_error_count = 0; 5898 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net); 5899 break; 5900 case SCTP_STATE_COOKIE_WAIT: 5901 /* 5902 * We consider OOTB any data sent during asoc setup. 5903 */ 5904 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__); 5905 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5906 msg); 5907 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5908 mflowtype, mflowid, inp->fibnum, 5909 vrf_id, port); 5910 goto out; 5911 /* sa_ignore NOTREACHED */ 5912 break; 5913 case SCTP_STATE_EMPTY: /* should not happen */ 5914 case SCTP_STATE_INUSE: /* should not happen */ 5915 case SCTP_STATE_SHUTDOWN_RECEIVED: /* This is a peer error */ 5916 case SCTP_STATE_SHUTDOWN_ACK_SENT: 5917 default: 5918 goto out; 5919 /* sa_ignore NOTREACHED */ 5920 break; 5921 case SCTP_STATE_OPEN: 5922 case SCTP_STATE_SHUTDOWN_SENT: 5923 break; 5924 } 5925 /* plow through the data chunks while length > offset */ 5926 retval = sctp_process_data(mm, iphlen, &offset, length, 5927 src, dst, sh, 5928 inp, stcb, net, &high_tsn, 5929 mflowtype, mflowid, 5930 vrf_id, port); 5931 if (retval == 2) { 5932 /* 5933 * The association aborted, NO UNLOCK needed since 5934 * the association is destroyed. 5935 */ 5936 stcb = NULL; 5937 goto out; 5938 } 5939 data_processed = 1; 5940 /* 5941 * Anything important needs to have been m_copy'ed in 5942 * process_data 5943 */ 5944 } 5945 /* take care of ecn */ 5946 if ((data_processed == 1) && 5947 (stcb->asoc.ecn_supported == 1) && 5948 ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) { 5949 /* Yep, we need to add a ECNE */ 5950 sctp_send_ecn_echo(stcb, net, high_tsn); 5951 } 5952 if ((data_processed == 0) && (fwd_tsn_seen)) { 5953 int was_a_gap; 5954 uint32_t highest_tsn; 5955 5956 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) { 5957 highest_tsn = stcb->asoc.highest_tsn_inside_nr_map; 5958 } else { 5959 highest_tsn = stcb->asoc.highest_tsn_inside_map; 5960 } 5961 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn); 5962 stcb->asoc.send_sack = 1; 5963 sctp_sack_check(stcb, was_a_gap); 5964 } else if (fwd_tsn_seen) { 5965 stcb->asoc.send_sack = 1; 5966 } 5967 /* trigger send of any chunks in queue... */ 5968 trigger_send: 5969 #ifdef SCTP_AUDITING_ENABLED 5970 sctp_audit_log(0xE0, 2); 5971 sctp_auditing(1, inp, stcb, net); 5972 #endif 5973 SCTPDBG(SCTP_DEBUG_INPUT1, 5974 "Check for chunk output prw:%d tqe:%d tf=%d\n", 5975 stcb->asoc.peers_rwnd, 5976 TAILQ_EMPTY(&stcb->asoc.control_send_queue), 5977 stcb->asoc.total_flight); 5978 un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight); 5979 if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 5980 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq; 5981 } 5982 if (cnt_ctrl_ready || 5983 ((un_sent) && 5984 (stcb->asoc.peers_rwnd > 0 || 5985 (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) { 5986 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n"); 5987 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 5988 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n"); 5989 } 5990 #ifdef SCTP_AUDITING_ENABLED 5991 sctp_audit_log(0xE0, 3); 5992 sctp_auditing(2, inp, stcb, net); 5993 #endif 5994 out: 5995 if (stcb != NULL) { 5996 SCTP_TCB_UNLOCK(stcb); 5997 } 5998 if (inp_decr != NULL) { 5999 /* reduce ref-count */ 6000 SCTP_INP_WLOCK(inp_decr); 6001 SCTP_INP_DECR_REF(inp_decr); 6002 SCTP_INP_WUNLOCK(inp_decr); 6003 } 6004 #ifdef INVARIANTS 6005 if (inp != NULL) { 6006 sctp_validate_no_locks(inp); 6007 } 6008 #endif 6009 return; 6010 } 6011 6012 #if 0 6013 static void 6014 sctp_print_mbuf_chain(struct mbuf *m) 6015 { 6016 for (; m; m = SCTP_BUF_NEXT(m)) { 6017 SCTP_PRINTF("%p: m_len = %ld\n", (void *)m, SCTP_BUF_LEN(m)); 6018 if (SCTP_BUF_IS_EXTENDED(m)) 6019 SCTP_PRINTF("%p: extend_size = %d\n", (void *)m, SCTP_BUF_EXTEND_SIZE(m)); 6020 } 6021 } 6022 6023 #endif 6024 6025 #ifdef INET 6026 void 6027 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port) 6028 { 6029 struct mbuf *m; 6030 int iphlen; 6031 uint32_t vrf_id = 0; 6032 uint8_t ecn_bits; 6033 struct sockaddr_in src, dst; 6034 struct ip *ip; 6035 struct sctphdr *sh; 6036 struct sctp_chunkhdr *ch; 6037 int length, offset; 6038 6039 #if !defined(SCTP_WITH_NO_CSUM) 6040 uint8_t compute_crc; 6041 6042 #endif 6043 uint32_t mflowid; 6044 uint8_t mflowtype; 6045 uint16_t fibnum; 6046 6047 iphlen = off; 6048 if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) { 6049 SCTP_RELEASE_PKT(i_pak); 6050 return; 6051 } 6052 m = SCTP_HEADER_TO_CHAIN(i_pak); 6053 #ifdef SCTP_MBUF_LOGGING 6054 /* Log in any input mbufs */ 6055 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 6056 sctp_log_mbc(m, SCTP_MBUF_INPUT); 6057 } 6058 #endif 6059 #ifdef SCTP_PACKET_LOGGING 6060 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) { 6061 sctp_packet_log(m); 6062 } 6063 #endif 6064 SCTPDBG(SCTP_DEBUG_CRCOFFLOAD, 6065 "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n", 6066 m->m_pkthdr.len, 6067 if_name(m->m_pkthdr.rcvif), 6068 (int)m->m_pkthdr.csum_flags, CSUM_BITS); 6069 mflowid = m->m_pkthdr.flowid; 6070 mflowtype = M_HASHTYPE_GET(m); 6071 fibnum = M_GETFIB(m); 6072 SCTP_STAT_INCR(sctps_recvpackets); 6073 SCTP_STAT_INCR_COUNTER64(sctps_inpackets); 6074 /* Get IP, SCTP, and first chunk header together in the first mbuf. */ 6075 offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr); 6076 if (SCTP_BUF_LEN(m) < offset) { 6077 if ((m = m_pullup(m, offset)) == NULL) { 6078 SCTP_STAT_INCR(sctps_hdrops); 6079 return; 6080 } 6081 } 6082 ip = mtod(m, struct ip *); 6083 sh = (struct sctphdr *)((caddr_t)ip + iphlen); 6084 ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr)); 6085 offset -= sizeof(struct sctp_chunkhdr); 6086 memset(&src, 0, sizeof(struct sockaddr_in)); 6087 src.sin_family = AF_INET; 6088 src.sin_len = sizeof(struct sockaddr_in); 6089 src.sin_port = sh->src_port; 6090 src.sin_addr = ip->ip_src; 6091 memset(&dst, 0, sizeof(struct sockaddr_in)); 6092 dst.sin_family = AF_INET; 6093 dst.sin_len = sizeof(struct sockaddr_in); 6094 dst.sin_port = sh->dest_port; 6095 dst.sin_addr = ip->ip_dst; 6096 length = ntohs(ip->ip_len); 6097 /* Validate mbuf chain length with IP payload length. */ 6098 if (SCTP_HEADER_LEN(m) != length) { 6099 SCTPDBG(SCTP_DEBUG_INPUT1, 6100 "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m)); 6101 SCTP_STAT_INCR(sctps_hdrops); 6102 goto out; 6103 } 6104 /* SCTP does not allow broadcasts or multicasts */ 6105 if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) { 6106 goto out; 6107 } 6108 if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) { 6109 goto out; 6110 } 6111 ecn_bits = ip->ip_tos; 6112 #if defined(SCTP_WITH_NO_CSUM) 6113 SCTP_STAT_INCR(sctps_recvnocrc); 6114 #else 6115 if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) { 6116 SCTP_STAT_INCR(sctps_recvhwcrc); 6117 compute_crc = 0; 6118 } else { 6119 SCTP_STAT_INCR(sctps_recvswcrc); 6120 compute_crc = 1; 6121 } 6122 #endif 6123 sctp_common_input_processing(&m, iphlen, offset, length, 6124 (struct sockaddr *)&src, 6125 (struct sockaddr *)&dst, 6126 sh, ch, 6127 #if !defined(SCTP_WITH_NO_CSUM) 6128 compute_crc, 6129 #endif 6130 ecn_bits, 6131 mflowtype, mflowid, fibnum, 6132 vrf_id, port); 6133 out: 6134 if (m) { 6135 sctp_m_freem(m); 6136 } 6137 return; 6138 } 6139 6140 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP) 6141 extern int *sctp_cpuarry; 6142 6143 #endif 6144 6145 void 6146 sctp_input(struct mbuf *m, int off) 6147 { 6148 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP) 6149 struct ip *ip; 6150 struct sctphdr *sh; 6151 int offset; 6152 int cpu_to_use; 6153 uint32_t flowid, tag; 6154 6155 if (mp_ncpus > 1) { 6156 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) { 6157 flowid = m->m_pkthdr.flowid; 6158 } else { 6159 /* 6160 * No flow id built by lower layers fix it so we 6161 * create one. 6162 */ 6163 offset = off + sizeof(struct sctphdr); 6164 if (SCTP_BUF_LEN(m) < offset) { 6165 if ((m = m_pullup(m, offset)) == NULL) { 6166 SCTP_STAT_INCR(sctps_hdrops); 6167 return; 6168 } 6169 } 6170 ip = mtod(m, struct ip *); 6171 sh = (struct sctphdr *)((caddr_t)ip + off); 6172 tag = htonl(sh->v_tag); 6173 flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port); 6174 m->m_pkthdr.flowid = flowid; 6175 M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE); 6176 } 6177 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus]; 6178 sctp_queue_to_mcore(m, off, cpu_to_use); 6179 return; 6180 } 6181 #endif 6182 sctp_input_with_port(m, off, 0); 6183 } 6184 6185 #endif
Cache object: a0d95c0ff9d1590c712f71fce79a56a2
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