1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved. 5 * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved. 6 * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions are met: 10 * 11 * a) Redistributions of source code must retain the above copyright notice, 12 * this list of conditions and the following disclaimer. 13 * 14 * b) Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in 16 * the documentation and/or other materials provided with the distribution. 17 * 18 * c) Neither the name of Cisco Systems, Inc. nor the names of its 19 * contributors may be used to endorse or promote products derived 20 * from this software without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 23 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 24 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 26 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 28 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 29 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 30 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 31 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 32 * THE POSSIBILITY OF SUCH DAMAGE. 33 */ 34 35 #include <sys/cdefs.h> 36 __FBSDID("$FreeBSD$"); 37 38 #include <netinet/sctp_os.h> 39 #include <netinet/sctp_var.h> 40 #include <netinet/sctp_sysctl.h> 41 #include <netinet/sctp_pcb.h> 42 #include <netinet/sctp_header.h> 43 #include <netinet/sctputil.h> 44 #include <netinet/sctp_output.h> 45 #include <netinet/sctp_input.h> 46 #include <netinet/sctp_auth.h> 47 #include <netinet/sctp_indata.h> 48 #include <netinet/sctp_asconf.h> 49 #include <netinet/sctp_bsd_addr.h> 50 #include <netinet/sctp_timer.h> 51 #include <netinet/sctp_crc32.h> 52 #if defined(INET) || defined(INET6) 53 #include <netinet/udp.h> 54 #endif 55 #include <sys/smp.h> 56 57 58 59 static void 60 sctp_stop_all_cookie_timers(struct sctp_tcb *stcb) 61 { 62 struct sctp_nets *net; 63 64 /* 65 * This now not only stops all cookie timers it also stops any INIT 66 * timers as well. This will make sure that the timers are stopped 67 * in all collision cases. 68 */ 69 SCTP_TCB_LOCK_ASSERT(stcb); 70 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 71 if (net->rxt_timer.type == SCTP_TIMER_TYPE_COOKIE) { 72 sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE, 73 stcb->sctp_ep, 74 stcb, 75 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_1); 76 } else if (net->rxt_timer.type == SCTP_TIMER_TYPE_INIT) { 77 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, 78 stcb->sctp_ep, 79 stcb, 80 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_2); 81 } 82 } 83 } 84 85 /* INIT handler */ 86 static void 87 sctp_handle_init(struct mbuf *m, int iphlen, int offset, 88 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 89 struct sctp_init_chunk *cp, struct sctp_inpcb *inp, 90 struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_no_unlock, 91 uint8_t mflowtype, uint32_t mflowid, 92 uint32_t vrf_id, uint16_t port) 93 { 94 struct sctp_init *init; 95 struct mbuf *op_err; 96 97 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_init: handling INIT tcb:%p\n", 98 (void *)stcb); 99 if (stcb == NULL) { 100 SCTP_INP_RLOCK(inp); 101 } 102 /* validate length */ 103 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_chunk)) { 104 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 105 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 106 mflowtype, mflowid, 107 vrf_id, port); 108 if (stcb) 109 *abort_no_unlock = 1; 110 goto outnow; 111 } 112 /* validate parameters */ 113 init = &cp->init; 114 if (init->initiate_tag == 0) { 115 /* protocol error... send abort */ 116 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 117 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 118 mflowtype, mflowid, 119 vrf_id, port); 120 if (stcb) 121 *abort_no_unlock = 1; 122 goto outnow; 123 } 124 if (ntohl(init->a_rwnd) < SCTP_MIN_RWND) { 125 /* invalid parameter... send abort */ 126 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 127 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 128 mflowtype, mflowid, 129 vrf_id, port); 130 if (stcb) 131 *abort_no_unlock = 1; 132 goto outnow; 133 } 134 if (init->num_inbound_streams == 0) { 135 /* protocol error... send abort */ 136 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 137 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 138 mflowtype, mflowid, 139 vrf_id, port); 140 if (stcb) 141 *abort_no_unlock = 1; 142 goto outnow; 143 } 144 if (init->num_outbound_streams == 0) { 145 /* protocol error... send abort */ 146 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 147 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 148 mflowtype, mflowid, 149 vrf_id, port); 150 if (stcb) 151 *abort_no_unlock = 1; 152 goto outnow; 153 } 154 if (sctp_validate_init_auth_params(m, offset + sizeof(*cp), 155 offset + ntohs(cp->ch.chunk_length))) { 156 /* auth parameter(s) error... send abort */ 157 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 158 "Problem with AUTH parameters"); 159 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 160 mflowtype, mflowid, 161 vrf_id, port); 162 if (stcb) 163 *abort_no_unlock = 1; 164 goto outnow; 165 } 166 /* We are only accepting if we have a listening socket. */ 167 if ((stcb == NULL) && 168 ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 169 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) || 170 (!SCTP_IS_LISTENING(inp)))) { 171 /* 172 * FIX ME ?? What about TCP model and we have a 173 * match/restart case? Actually no fix is needed. the lookup 174 * will always find the existing assoc so stcb would not be 175 * NULL. It may be questionable to do this since we COULD 176 * just send back the INIT-ACK and hope that the app did 177 * accept()'s by the time the COOKIE was sent. But there is 178 * a price to pay for COOKIE generation and I don't want to 179 * pay it on the chance that the app will actually do some 180 * accepts(). The App just looses and should NOT be in this 181 * state :-) 182 */ 183 if (SCTP_BASE_SYSCTL(sctp_blackhole) == 0) { 184 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 185 "No listener"); 186 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err, 187 mflowtype, mflowid, inp->fibnum, 188 vrf_id, port); 189 } 190 goto outnow; 191 } 192 if ((stcb != NULL) && 193 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT)) { 194 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending SHUTDOWN-ACK\n"); 195 sctp_send_shutdown_ack(stcb, NULL); 196 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 197 } else { 198 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n"); 199 sctp_send_initiate_ack(inp, stcb, net, m, iphlen, offset, 200 src, dst, sh, cp, 201 mflowtype, mflowid, 202 vrf_id, port); 203 } 204 outnow: 205 if (stcb == NULL) { 206 SCTP_INP_RUNLOCK(inp); 207 } 208 } 209 210 /* 211 * process peer "INIT/INIT-ACK" chunk returns value < 0 on error 212 */ 213 214 int 215 sctp_is_there_unsent_data(struct sctp_tcb *stcb, int so_locked 216 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING) 217 SCTP_UNUSED 218 #endif 219 ) 220 { 221 int unsent_data; 222 unsigned int i; 223 struct sctp_stream_queue_pending *sp; 224 struct sctp_association *asoc; 225 226 /* 227 * This function returns if any stream has true unsent data on it. 228 * Note that as it looks through it will clean up any places that 229 * have old data that has been sent but left at top of stream queue. 230 */ 231 asoc = &stcb->asoc; 232 unsent_data = 0; 233 SCTP_TCB_SEND_LOCK(stcb); 234 if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 235 /* Check to see if some data queued */ 236 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 237 /* sa_ignore FREED_MEMORY */ 238 sp = TAILQ_FIRST(&stcb->asoc.strmout[i].outqueue); 239 if (sp == NULL) { 240 continue; 241 } 242 if ((sp->msg_is_complete) && 243 (sp->length == 0) && 244 (sp->sender_all_done)) { 245 /* 246 * We are doing differed cleanup. Last time 247 * through when we took all the data the 248 * sender_all_done was not set. 249 */ 250 if (sp->put_last_out == 0) { 251 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n"); 252 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n", 253 sp->sender_all_done, 254 sp->length, 255 sp->msg_is_complete, 256 sp->put_last_out); 257 } 258 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1); 259 TAILQ_REMOVE(&stcb->asoc.strmout[i].outqueue, sp, next); 260 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, &asoc->strmout[i], sp, 1); 261 if (sp->net) { 262 sctp_free_remote_addr(sp->net); 263 sp->net = NULL; 264 } 265 if (sp->data) { 266 sctp_m_freem(sp->data); 267 sp->data = NULL; 268 } 269 sctp_free_a_strmoq(stcb, sp, so_locked); 270 if (!TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) { 271 unsent_data++; 272 } 273 } else { 274 unsent_data++; 275 } 276 if (unsent_data > 0) { 277 break; 278 } 279 } 280 } 281 SCTP_TCB_SEND_UNLOCK(stcb); 282 return (unsent_data); 283 } 284 285 static int 286 sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb) 287 { 288 struct sctp_init *init; 289 struct sctp_association *asoc; 290 struct sctp_nets *lnet; 291 unsigned int i; 292 293 init = &cp->init; 294 asoc = &stcb->asoc; 295 /* save off parameters */ 296 asoc->peer_vtag = ntohl(init->initiate_tag); 297 asoc->peers_rwnd = ntohl(init->a_rwnd); 298 /* init tsn's */ 299 asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1; 300 301 if (!TAILQ_EMPTY(&asoc->nets)) { 302 /* update any ssthresh's that may have a default */ 303 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) { 304 lnet->ssthresh = asoc->peers_rwnd; 305 if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) { 306 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION); 307 } 308 } 309 } 310 SCTP_TCB_SEND_LOCK(stcb); 311 if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) { 312 unsigned int newcnt; 313 struct sctp_stream_out *outs; 314 struct sctp_stream_queue_pending *sp, *nsp; 315 struct sctp_tmit_chunk *chk, *nchk; 316 317 /* abandon the upper streams */ 318 newcnt = ntohs(init->num_inbound_streams); 319 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) { 320 if (chk->rec.data.sid >= newcnt) { 321 TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next); 322 asoc->send_queue_cnt--; 323 if (asoc->strmout[chk->rec.data.sid].chunks_on_queues > 0) { 324 asoc->strmout[chk->rec.data.sid].chunks_on_queues--; 325 #ifdef INVARIANTS 326 } else { 327 panic("No chunks on the queues for sid %u.", chk->rec.data.sid); 328 #endif 329 } 330 if (chk->data != NULL) { 331 sctp_free_bufspace(stcb, asoc, chk, 1); 332 sctp_ulp_notify(SCTP_NOTIFY_UNSENT_DG_FAIL, stcb, 333 0, chk, SCTP_SO_NOT_LOCKED); 334 if (chk->data) { 335 sctp_m_freem(chk->data); 336 chk->data = NULL; 337 } 338 } 339 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 340 /* sa_ignore FREED_MEMORY */ 341 } 342 } 343 if (asoc->strmout) { 344 for (i = newcnt; i < asoc->pre_open_streams; i++) { 345 outs = &asoc->strmout[i]; 346 TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) { 347 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1); 348 TAILQ_REMOVE(&outs->outqueue, sp, next); 349 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, outs, sp, 1); 350 sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL, 351 stcb, 0, sp, SCTP_SO_NOT_LOCKED); 352 if (sp->data) { 353 sctp_m_freem(sp->data); 354 sp->data = NULL; 355 } 356 if (sp->net) { 357 sctp_free_remote_addr(sp->net); 358 sp->net = NULL; 359 } 360 /* Free the chunk */ 361 sctp_free_a_strmoq(stcb, sp, SCTP_SO_NOT_LOCKED); 362 /* sa_ignore FREED_MEMORY */ 363 } 364 outs->state = SCTP_STREAM_CLOSED; 365 } 366 } 367 /* cut back the count */ 368 asoc->pre_open_streams = newcnt; 369 } 370 SCTP_TCB_SEND_UNLOCK(stcb); 371 asoc->streamoutcnt = asoc->pre_open_streams; 372 if (asoc->strmout) { 373 for (i = 0; i < asoc->streamoutcnt; i++) { 374 asoc->strmout[i].state = SCTP_STREAM_OPEN; 375 } 376 } 377 /* EY - nr_sack: initialize highest tsn in nr_mapping_array */ 378 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 379 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 380 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 381 } 382 /* This is the next one we expect */ 383 asoc->str_reset_seq_in = asoc->asconf_seq_in + 1; 384 385 asoc->mapping_array_base_tsn = ntohl(init->initial_tsn); 386 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in; 387 388 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 389 /* open the requested streams */ 390 391 if (asoc->strmin != NULL) { 392 /* Free the old ones */ 393 for (i = 0; i < asoc->streamincnt; i++) { 394 sctp_clean_up_stream(stcb, &asoc->strmin[i].inqueue); 395 sctp_clean_up_stream(stcb, &asoc->strmin[i].uno_inqueue); 396 } 397 SCTP_FREE(asoc->strmin, SCTP_M_STRMI); 398 } 399 if (asoc->max_inbound_streams > ntohs(init->num_outbound_streams)) { 400 asoc->streamincnt = ntohs(init->num_outbound_streams); 401 } else { 402 asoc->streamincnt = asoc->max_inbound_streams; 403 } 404 SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt * 405 sizeof(struct sctp_stream_in), SCTP_M_STRMI); 406 if (asoc->strmin == NULL) { 407 /* we didn't get memory for the streams! */ 408 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n"); 409 return (-1); 410 } 411 for (i = 0; i < asoc->streamincnt; i++) { 412 asoc->strmin[i].sid = i; 413 asoc->strmin[i].last_mid_delivered = 0xffffffff; 414 TAILQ_INIT(&asoc->strmin[i].inqueue); 415 TAILQ_INIT(&asoc->strmin[i].uno_inqueue); 416 asoc->strmin[i].pd_api_started = 0; 417 asoc->strmin[i].delivery_started = 0; 418 } 419 /* 420 * load_address_from_init will put the addresses into the 421 * association when the COOKIE is processed or the INIT-ACK is 422 * processed. Both types of COOKIE's existing and new call this 423 * routine. It will remove addresses that are no longer in the 424 * association (for the restarting case where addresses are 425 * removed). Up front when the INIT arrives we will discard it if it 426 * is a restart and new addresses have been added. 427 */ 428 /* sa_ignore MEMLEAK */ 429 return (0); 430 } 431 432 /* 433 * INIT-ACK message processing/consumption returns value < 0 on error 434 */ 435 static int 436 sctp_process_init_ack(struct mbuf *m, int iphlen, int offset, 437 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 438 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 439 struct sctp_nets *net, int *abort_no_unlock, 440 uint8_t mflowtype, uint32_t mflowid, 441 uint32_t vrf_id) 442 { 443 struct sctp_association *asoc; 444 struct mbuf *op_err; 445 int retval, abort_flag; 446 uint32_t initack_limit; 447 int nat_friendly = 0; 448 449 /* First verify that we have no illegal param's */ 450 abort_flag = 0; 451 452 op_err = sctp_arethere_unrecognized_parameters(m, 453 (offset + sizeof(struct sctp_init_chunk)), 454 &abort_flag, (struct sctp_chunkhdr *)cp, &nat_friendly); 455 if (abort_flag) { 456 /* Send an abort and notify peer */ 457 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 458 *abort_no_unlock = 1; 459 return (-1); 460 } 461 asoc = &stcb->asoc; 462 asoc->peer_supports_nat = (uint8_t)nat_friendly; 463 /* process the peer's parameters in the INIT-ACK */ 464 retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb); 465 if (retval < 0) { 466 return (retval); 467 } 468 initack_limit = offset + ntohs(cp->ch.chunk_length); 469 /* load all addresses */ 470 if ((retval = sctp_load_addresses_from_init(stcb, m, 471 (offset + sizeof(struct sctp_init_chunk)), initack_limit, 472 src, dst, NULL, stcb->asoc.port))) { 473 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 474 "Problem with address parameters"); 475 SCTPDBG(SCTP_DEBUG_INPUT1, 476 "Load addresses from INIT causes an abort %d\n", 477 retval); 478 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 479 src, dst, sh, op_err, 480 mflowtype, mflowid, 481 vrf_id, net->port); 482 *abort_no_unlock = 1; 483 return (-1); 484 } 485 /* if the peer doesn't support asconf, flush the asconf queue */ 486 if (asoc->asconf_supported == 0) { 487 struct sctp_asconf_addr *param, *nparam; 488 489 TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) { 490 TAILQ_REMOVE(&asoc->asconf_queue, param, next); 491 SCTP_FREE(param, SCTP_M_ASC_ADDR); 492 } 493 } 494 stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs, 495 stcb->asoc.local_hmacs); 496 if (op_err) { 497 sctp_queue_op_err(stcb, op_err); 498 /* queuing will steal away the mbuf chain to the out queue */ 499 op_err = NULL; 500 } 501 /* extract the cookie and queue it to "echo" it back... */ 502 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 503 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 504 stcb->asoc.overall_error_count, 505 0, 506 SCTP_FROM_SCTP_INPUT, 507 __LINE__); 508 } 509 stcb->asoc.overall_error_count = 0; 510 net->error_count = 0; 511 512 /* 513 * Cancel the INIT timer, We do this first before queueing the 514 * cookie. We always cancel at the primary to assue that we are 515 * canceling the timer started by the INIT which always goes to the 516 * primary. 517 */ 518 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb, 519 asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3); 520 521 /* calculate the RTO */ 522 net->RTO = sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, 523 SCTP_RTT_FROM_NON_DATA); 524 retval = sctp_send_cookie_echo(m, offset, stcb, net); 525 if (retval < 0) { 526 /* 527 * No cookie, we probably should send a op error. But in any 528 * case if there is no cookie in the INIT-ACK, we can 529 * abandon the peer, its broke. 530 */ 531 if (retval == -3) { 532 uint16_t len; 533 534 len = (uint16_t)(sizeof(struct sctp_error_missing_param) + sizeof(uint16_t)); 535 /* We abort with an error of missing mandatory param */ 536 op_err = sctp_get_mbuf_for_msg(len, 0, M_NOWAIT, 1, MT_DATA); 537 if (op_err != NULL) { 538 struct sctp_error_missing_param *cause; 539 540 SCTP_BUF_LEN(op_err) = len; 541 cause = mtod(op_err, struct sctp_error_missing_param *); 542 /* Subtract the reserved param */ 543 cause->cause.code = htons(SCTP_CAUSE_MISSING_PARAM); 544 cause->cause.length = htons(len); 545 cause->num_missing_params = htonl(1); 546 cause->type[0] = htons(SCTP_STATE_COOKIE); 547 } 548 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 549 src, dst, sh, op_err, 550 mflowtype, mflowid, 551 vrf_id, net->port); 552 *abort_no_unlock = 1; 553 } 554 return (retval); 555 } 556 return (0); 557 } 558 559 static void 560 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp, 561 struct sctp_tcb *stcb, struct sctp_nets *net) 562 { 563 union sctp_sockstore store; 564 struct sctp_nets *r_net, *f_net; 565 struct timeval tv; 566 int req_prim = 0; 567 uint16_t old_error_counter; 568 569 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) { 570 /* Invalid length */ 571 return; 572 } 573 memset(&store, 0, sizeof(store)); 574 switch (cp->heartbeat.hb_info.addr_family) { 575 #ifdef INET 576 case AF_INET: 577 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) { 578 store.sin.sin_family = cp->heartbeat.hb_info.addr_family; 579 store.sin.sin_len = cp->heartbeat.hb_info.addr_len; 580 store.sin.sin_port = stcb->rport; 581 memcpy(&store.sin.sin_addr, cp->heartbeat.hb_info.address, 582 sizeof(store.sin.sin_addr)); 583 } else { 584 return; 585 } 586 break; 587 #endif 588 #ifdef INET6 589 case AF_INET6: 590 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) { 591 store.sin6.sin6_family = cp->heartbeat.hb_info.addr_family; 592 store.sin6.sin6_len = cp->heartbeat.hb_info.addr_len; 593 store.sin6.sin6_port = stcb->rport; 594 memcpy(&store.sin6.sin6_addr, cp->heartbeat.hb_info.address, sizeof(struct in6_addr)); 595 } else { 596 return; 597 } 598 break; 599 #endif 600 default: 601 return; 602 } 603 r_net = sctp_findnet(stcb, &store.sa); 604 if (r_net == NULL) { 605 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n"); 606 return; 607 } 608 if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) && 609 (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) && 610 (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) { 611 /* 612 * If the its a HB and it's random value is correct when can 613 * confirm the destination. 614 */ 615 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 616 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) { 617 stcb->asoc.primary_destination = r_net; 618 r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY; 619 f_net = TAILQ_FIRST(&stcb->asoc.nets); 620 if (f_net != r_net) { 621 /* 622 * first one on the list is NOT the primary 623 * sctp_cmpaddr() is much more efficient if 624 * the primary is the first on the list, 625 * make it so. 626 */ 627 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next); 628 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next); 629 } 630 req_prim = 1; 631 } 632 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 633 stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 634 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, 635 r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4); 636 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 637 } 638 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 639 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 640 stcb->asoc.overall_error_count, 641 0, 642 SCTP_FROM_SCTP_INPUT, 643 __LINE__); 644 } 645 stcb->asoc.overall_error_count = 0; 646 old_error_counter = r_net->error_count; 647 r_net->error_count = 0; 648 r_net->hb_responded = 1; 649 tv.tv_sec = cp->heartbeat.hb_info.time_value_1; 650 tv.tv_usec = cp->heartbeat.hb_info.time_value_2; 651 /* Now lets do a RTO with this */ 652 r_net->RTO = sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, 653 SCTP_RTT_FROM_NON_DATA); 654 if (!(r_net->dest_state & SCTP_ADDR_REACHABLE)) { 655 r_net->dest_state |= SCTP_ADDR_REACHABLE; 656 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb, 657 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 658 } 659 if (r_net->dest_state & SCTP_ADDR_PF) { 660 r_net->dest_state &= ~SCTP_ADDR_PF; 661 stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net); 662 } 663 if (old_error_counter > 0) { 664 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 665 stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_5); 666 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 667 } 668 if (r_net == stcb->asoc.primary_destination) { 669 if (stcb->asoc.alternate) { 670 /* release the alternate, primary is good */ 671 sctp_free_remote_addr(stcb->asoc.alternate); 672 stcb->asoc.alternate = NULL; 673 } 674 } 675 /* Mobility adaptation */ 676 if (req_prim) { 677 if ((sctp_is_mobility_feature_on(stcb->sctp_ep, 678 SCTP_MOBILITY_BASE) || 679 sctp_is_mobility_feature_on(stcb->sctp_ep, 680 SCTP_MOBILITY_FASTHANDOFF)) && 681 sctp_is_mobility_feature_on(stcb->sctp_ep, 682 SCTP_MOBILITY_PRIM_DELETED)) { 683 684 sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED, 685 stcb->sctp_ep, stcb, NULL, 686 SCTP_FROM_SCTP_INPUT + SCTP_LOC_6); 687 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 688 SCTP_MOBILITY_FASTHANDOFF)) { 689 sctp_assoc_immediate_retrans(stcb, 690 stcb->asoc.primary_destination); 691 } 692 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 693 SCTP_MOBILITY_BASE)) { 694 sctp_move_chunks_from_net(stcb, 695 stcb->asoc.deleted_primary); 696 } 697 sctp_delete_prim_timer(stcb->sctp_ep, stcb, 698 stcb->asoc.deleted_primary); 699 } 700 } 701 } 702 703 static int 704 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb) 705 { 706 /* 707 * return 0 means we want you to proceed with the abort non-zero 708 * means no abort processing 709 */ 710 struct sctpasochead *head; 711 712 if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_WAIT) || 713 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) { 714 atomic_add_int(&stcb->asoc.refcnt, 1); 715 SCTP_TCB_UNLOCK(stcb); 716 SCTP_INP_INFO_WLOCK(); 717 SCTP_TCB_LOCK(stcb); 718 atomic_subtract_int(&stcb->asoc.refcnt, 1); 719 } 720 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_WAIT) { 721 /* generate a new vtag and send init */ 722 LIST_REMOVE(stcb, sctp_asocs); 723 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 724 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 725 /* 726 * put it in the bucket in the vtag hash of assoc's for the 727 * system 728 */ 729 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 730 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 731 SCTP_INP_INFO_WUNLOCK(); 732 return (1); 733 } 734 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) { 735 /* 736 * treat like a case where the cookie expired i.e.: - dump 737 * current cookie. - generate a new vtag. - resend init. 738 */ 739 /* generate a new vtag and send init */ 740 LIST_REMOVE(stcb, sctp_asocs); 741 stcb->asoc.state &= ~SCTP_STATE_COOKIE_ECHOED; 742 stcb->asoc.state |= SCTP_STATE_COOKIE_WAIT; 743 sctp_stop_all_cookie_timers(stcb); 744 sctp_toss_old_cookies(stcb, &stcb->asoc); 745 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 746 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 747 /* 748 * put it in the bucket in the vtag hash of assoc's for the 749 * system 750 */ 751 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 752 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 753 SCTP_INP_INFO_WUNLOCK(); 754 return (1); 755 } 756 return (0); 757 } 758 759 static int 760 sctp_handle_nat_missing_state(struct sctp_tcb *stcb, 761 struct sctp_nets *net) 762 { 763 /* 764 * return 0 means we want you to proceed with the abort non-zero 765 * means no abort processing 766 */ 767 if (stcb->asoc.auth_supported == 0) { 768 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n"); 769 return (0); 770 } 771 sctp_asconf_send_nat_state_update(stcb, net); 772 return (1); 773 } 774 775 776 /* Returns 1 if the stcb was aborted, 0 otherwise */ 777 static int 778 sctp_handle_abort(struct sctp_abort_chunk *abort, 779 struct sctp_tcb *stcb, struct sctp_nets *net) 780 { 781 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 782 struct socket *so; 783 #endif 784 uint16_t len; 785 uint16_t error; 786 787 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n"); 788 if (stcb == NULL) 789 return (0); 790 791 len = ntohs(abort->ch.chunk_length); 792 if (len >= sizeof(struct sctp_chunkhdr) + sizeof(struct sctp_error_cause)) { 793 /* 794 * Need to check the cause codes for our two magic nat 795 * aborts which don't kill the assoc necessarily. 796 */ 797 struct sctp_error_cause *cause; 798 799 cause = (struct sctp_error_cause *)(abort + 1); 800 error = ntohs(cause->code); 801 if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) { 802 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n", 803 abort->ch.chunk_flags); 804 if (sctp_handle_nat_colliding_state(stcb)) { 805 return (0); 806 } 807 } else if (error == SCTP_CAUSE_NAT_MISSING_STATE) { 808 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n", 809 abort->ch.chunk_flags); 810 if (sctp_handle_nat_missing_state(stcb, net)) { 811 return (0); 812 } 813 } 814 } else { 815 error = 0; 816 } 817 /* stop any receive timers */ 818 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net, 819 SCTP_FROM_SCTP_INPUT + SCTP_LOC_7); 820 /* notify user of the abort and clean up... */ 821 sctp_abort_notification(stcb, 1, error, abort, SCTP_SO_NOT_LOCKED); 822 /* free the tcb */ 823 SCTP_STAT_INCR_COUNTER32(sctps_aborted); 824 if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) || 825 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 826 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 827 } 828 #ifdef SCTP_ASOCLOG_OF_TSNS 829 sctp_print_out_track_log(stcb); 830 #endif 831 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 832 so = SCTP_INP_SO(stcb->sctp_ep); 833 atomic_add_int(&stcb->asoc.refcnt, 1); 834 SCTP_TCB_UNLOCK(stcb); 835 SCTP_SOCKET_LOCK(so, 1); 836 SCTP_TCB_LOCK(stcb); 837 atomic_subtract_int(&stcb->asoc.refcnt, 1); 838 #endif 839 stcb->asoc.state |= SCTP_STATE_WAS_ABORTED; 840 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 841 SCTP_FROM_SCTP_INPUT + SCTP_LOC_8); 842 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 843 SCTP_SOCKET_UNLOCK(so, 1); 844 #endif 845 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n"); 846 return (1); 847 } 848 849 static void 850 sctp_start_net_timers(struct sctp_tcb *stcb) 851 { 852 uint32_t cnt_hb_sent; 853 struct sctp_nets *net; 854 855 cnt_hb_sent = 0; 856 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 857 /* 858 * For each network start: 1) A pmtu timer. 2) A HB timer 3) 859 * If the dest in unconfirmed send a hb as well if under 860 * max_hb_burst have been sent. 861 */ 862 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net); 863 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net); 864 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) && 865 (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) { 866 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 867 cnt_hb_sent++; 868 } 869 } 870 if (cnt_hb_sent) { 871 sctp_chunk_output(stcb->sctp_ep, stcb, 872 SCTP_OUTPUT_FROM_COOKIE_ACK, 873 SCTP_SO_NOT_LOCKED); 874 } 875 } 876 877 878 static void 879 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp, 880 struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag) 881 { 882 struct sctp_association *asoc; 883 int some_on_streamwheel; 884 int old_state; 885 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 886 struct socket *so; 887 #endif 888 889 SCTPDBG(SCTP_DEBUG_INPUT2, 890 "sctp_handle_shutdown: handling SHUTDOWN\n"); 891 if (stcb == NULL) 892 return; 893 asoc = &stcb->asoc; 894 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) || 895 (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) { 896 return; 897 } 898 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) { 899 /* Shutdown NOT the expected size */ 900 return; 901 } 902 old_state = SCTP_GET_STATE(asoc); 903 sctp_update_acked(stcb, cp, abort_flag); 904 if (*abort_flag) { 905 return; 906 } 907 if (asoc->control_pdapi) { 908 /* 909 * With a normal shutdown we assume the end of last record. 910 */ 911 SCTP_INP_READ_LOCK(stcb->sctp_ep); 912 if (asoc->control_pdapi->on_strm_q) { 913 struct sctp_stream_in *strm; 914 915 strm = &asoc->strmin[asoc->control_pdapi->sinfo_stream]; 916 if (asoc->control_pdapi->on_strm_q == SCTP_ON_UNORDERED) { 917 /* Unordered */ 918 TAILQ_REMOVE(&strm->uno_inqueue, asoc->control_pdapi, next_instrm); 919 asoc->control_pdapi->on_strm_q = 0; 920 } else if (asoc->control_pdapi->on_strm_q == SCTP_ON_ORDERED) { 921 /* Ordered */ 922 TAILQ_REMOVE(&strm->inqueue, asoc->control_pdapi, next_instrm); 923 asoc->control_pdapi->on_strm_q = 0; 924 #ifdef INVARIANTS 925 } else { 926 panic("Unknown state on ctrl:%p on_strm_q:%d", 927 asoc->control_pdapi, 928 asoc->control_pdapi->on_strm_q); 929 #endif 930 } 931 } 932 asoc->control_pdapi->end_added = 1; 933 asoc->control_pdapi->pdapi_aborted = 1; 934 asoc->control_pdapi = NULL; 935 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 936 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 937 so = SCTP_INP_SO(stcb->sctp_ep); 938 atomic_add_int(&stcb->asoc.refcnt, 1); 939 SCTP_TCB_UNLOCK(stcb); 940 SCTP_SOCKET_LOCK(so, 1); 941 SCTP_TCB_LOCK(stcb); 942 atomic_subtract_int(&stcb->asoc.refcnt, 1); 943 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 944 /* assoc was freed while we were unlocked */ 945 SCTP_SOCKET_UNLOCK(so, 1); 946 return; 947 } 948 #endif 949 if (stcb->sctp_socket) { 950 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 951 } 952 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 953 SCTP_SOCKET_UNLOCK(so, 1); 954 #endif 955 } 956 /* goto SHUTDOWN_RECEIVED state to block new requests */ 957 if (stcb->sctp_socket) { 958 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) && 959 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) && 960 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) { 961 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_RECEIVED); 962 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 963 /* 964 * notify upper layer that peer has initiated a 965 * shutdown 966 */ 967 sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 968 969 /* reset time */ 970 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 971 } 972 } 973 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) { 974 /* 975 * stop the shutdown timer, since we WILL move to 976 * SHUTDOWN-ACK-SENT. 977 */ 978 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, 979 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9); 980 } 981 /* Now is there unsent data on a stream somewhere? */ 982 some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED); 983 984 if (!TAILQ_EMPTY(&asoc->send_queue) || 985 !TAILQ_EMPTY(&asoc->sent_queue) || 986 some_on_streamwheel) { 987 /* By returning we will push more data out */ 988 return; 989 } else { 990 /* no outstanding data to send, so move on... */ 991 /* send SHUTDOWN-ACK */ 992 /* move to SHUTDOWN-ACK-SENT state */ 993 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) || 994 (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 995 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 996 } 997 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 998 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 999 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT); 1000 sctp_stop_timers_for_shutdown(stcb); 1001 sctp_send_shutdown_ack(stcb, net); 1002 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, 1003 stcb->sctp_ep, stcb, net); 1004 } else if (old_state == SCTP_STATE_SHUTDOWN_ACK_SENT) { 1005 sctp_send_shutdown_ack(stcb, net); 1006 } 1007 } 1008 } 1009 1010 static void 1011 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED, 1012 struct sctp_tcb *stcb, 1013 struct sctp_nets *net) 1014 { 1015 struct sctp_association *asoc; 1016 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1017 struct socket *so; 1018 1019 so = SCTP_INP_SO(stcb->sctp_ep); 1020 #endif 1021 SCTPDBG(SCTP_DEBUG_INPUT2, 1022 "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n"); 1023 if (stcb == NULL) 1024 return; 1025 1026 asoc = &stcb->asoc; 1027 /* process according to association state */ 1028 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) || 1029 (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) { 1030 /* unexpected SHUTDOWN-ACK... do OOTB handling... */ 1031 sctp_send_shutdown_complete(stcb, net, 1); 1032 SCTP_TCB_UNLOCK(stcb); 1033 return; 1034 } 1035 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) && 1036 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) { 1037 /* unexpected SHUTDOWN-ACK... so ignore... */ 1038 SCTP_TCB_UNLOCK(stcb); 1039 return; 1040 } 1041 if (asoc->control_pdapi) { 1042 /* 1043 * With a normal shutdown we assume the end of last record. 1044 */ 1045 SCTP_INP_READ_LOCK(stcb->sctp_ep); 1046 asoc->control_pdapi->end_added = 1; 1047 asoc->control_pdapi->pdapi_aborted = 1; 1048 asoc->control_pdapi = NULL; 1049 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 1050 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1051 atomic_add_int(&stcb->asoc.refcnt, 1); 1052 SCTP_TCB_UNLOCK(stcb); 1053 SCTP_SOCKET_LOCK(so, 1); 1054 SCTP_TCB_LOCK(stcb); 1055 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1056 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1057 /* assoc was freed while we were unlocked */ 1058 SCTP_SOCKET_UNLOCK(so, 1); 1059 return; 1060 } 1061 #endif 1062 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 1063 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1064 SCTP_SOCKET_UNLOCK(so, 1); 1065 #endif 1066 } 1067 #ifdef INVARIANTS 1068 if (!TAILQ_EMPTY(&asoc->send_queue) || 1069 !TAILQ_EMPTY(&asoc->sent_queue) || 1070 sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) { 1071 panic("Queues are not empty when handling SHUTDOWN-ACK"); 1072 } 1073 #endif 1074 /* stop the timer */ 1075 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, 1076 SCTP_FROM_SCTP_INPUT + SCTP_LOC_10); 1077 /* send SHUTDOWN-COMPLETE */ 1078 sctp_send_shutdown_complete(stcb, net, 0); 1079 /* notify upper layer protocol */ 1080 if (stcb->sctp_socket) { 1081 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1082 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 1083 stcb->sctp_socket->so_snd.sb_cc = 0; 1084 } 1085 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 1086 } 1087 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 1088 /* free the TCB but first save off the ep */ 1089 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1090 atomic_add_int(&stcb->asoc.refcnt, 1); 1091 SCTP_TCB_UNLOCK(stcb); 1092 SCTP_SOCKET_LOCK(so, 1); 1093 SCTP_TCB_LOCK(stcb); 1094 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1095 #endif 1096 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1097 SCTP_FROM_SCTP_INPUT + SCTP_LOC_11); 1098 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1099 SCTP_SOCKET_UNLOCK(so, 1); 1100 #endif 1101 } 1102 1103 static void 1104 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, uint8_t chunk_type, 1105 struct sctp_nets *net) 1106 { 1107 switch (chunk_type) { 1108 case SCTP_ASCONF_ACK: 1109 case SCTP_ASCONF: 1110 sctp_asconf_cleanup(stcb, net); 1111 break; 1112 case SCTP_IFORWARD_CUM_TSN: 1113 case SCTP_FORWARD_CUM_TSN: 1114 stcb->asoc.prsctp_supported = 0; 1115 break; 1116 default: 1117 SCTPDBG(SCTP_DEBUG_INPUT2, 1118 "Peer does not support chunk type %d (0x%x).\n", 1119 chunk_type, chunk_type); 1120 break; 1121 } 1122 } 1123 1124 /* 1125 * Skip past the param header and then we will find the param that caused the 1126 * problem. There are a number of param's in a ASCONF OR the prsctp param 1127 * these will turn of specific features. 1128 * XXX: Is this the right thing to do? 1129 */ 1130 static void 1131 sctp_process_unrecog_param(struct sctp_tcb *stcb, uint16_t parameter_type) 1132 { 1133 switch (parameter_type) { 1134 /* pr-sctp draft */ 1135 case SCTP_PRSCTP_SUPPORTED: 1136 stcb->asoc.prsctp_supported = 0; 1137 break; 1138 case SCTP_SUPPORTED_CHUNK_EXT: 1139 break; 1140 /* draft-ietf-tsvwg-addip-sctp */ 1141 case SCTP_HAS_NAT_SUPPORT: 1142 stcb->asoc.peer_supports_nat = 0; 1143 break; 1144 case SCTP_ADD_IP_ADDRESS: 1145 case SCTP_DEL_IP_ADDRESS: 1146 case SCTP_SET_PRIM_ADDR: 1147 stcb->asoc.asconf_supported = 0; 1148 break; 1149 case SCTP_SUCCESS_REPORT: 1150 case SCTP_ERROR_CAUSE_IND: 1151 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n"); 1152 SCTPDBG(SCTP_DEBUG_INPUT2, 1153 "Turning off ASCONF to this strange peer\n"); 1154 stcb->asoc.asconf_supported = 0; 1155 break; 1156 default: 1157 SCTPDBG(SCTP_DEBUG_INPUT2, 1158 "Peer does not support param type %d (0x%x)??\n", 1159 parameter_type, parameter_type); 1160 break; 1161 } 1162 } 1163 1164 static int 1165 sctp_handle_error(struct sctp_chunkhdr *ch, 1166 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 1167 { 1168 struct sctp_error_cause *cause; 1169 struct sctp_association *asoc; 1170 uint32_t remaining_length, adjust; 1171 uint16_t code, cause_code, cause_length; 1172 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1173 struct socket *so; 1174 #endif 1175 1176 /* parse through all of the errors and process */ 1177 asoc = &stcb->asoc; 1178 cause = (struct sctp_error_cause *)((caddr_t)ch + 1179 sizeof(struct sctp_chunkhdr)); 1180 remaining_length = ntohs(ch->chunk_length); 1181 if (remaining_length > limit) { 1182 remaining_length = limit; 1183 } 1184 if (remaining_length >= sizeof(struct sctp_chunkhdr)) { 1185 remaining_length -= sizeof(struct sctp_chunkhdr); 1186 } else { 1187 remaining_length = 0; 1188 } 1189 code = 0; 1190 while (remaining_length >= sizeof(struct sctp_error_cause)) { 1191 /* Process an Error Cause */ 1192 cause_code = ntohs(cause->code); 1193 cause_length = ntohs(cause->length); 1194 if ((cause_length > remaining_length) || (cause_length == 0)) { 1195 /* Invalid cause length, possibly due to truncation. */ 1196 SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in cause - bytes left: %u cause length: %u\n", 1197 remaining_length, cause_length); 1198 return (0); 1199 } 1200 if (code == 0) { 1201 /* report the first error cause */ 1202 code = cause_code; 1203 } 1204 switch (cause_code) { 1205 case SCTP_CAUSE_INVALID_STREAM: 1206 case SCTP_CAUSE_MISSING_PARAM: 1207 case SCTP_CAUSE_INVALID_PARAM: 1208 case SCTP_CAUSE_NO_USER_DATA: 1209 SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %u back? We have a bug :/ (or do they?)\n", 1210 cause_code); 1211 break; 1212 case SCTP_CAUSE_NAT_COLLIDING_STATE: 1213 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags: %x\n", 1214 ch->chunk_flags); 1215 if (sctp_handle_nat_colliding_state(stcb)) { 1216 return (0); 1217 } 1218 break; 1219 case SCTP_CAUSE_NAT_MISSING_STATE: 1220 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags: %x\n", 1221 ch->chunk_flags); 1222 if (sctp_handle_nat_missing_state(stcb, net)) { 1223 return (0); 1224 } 1225 break; 1226 case SCTP_CAUSE_STALE_COOKIE: 1227 /* 1228 * We only act if we have echoed a cookie and are 1229 * waiting. 1230 */ 1231 if ((cause_length >= sizeof(struct sctp_error_stale_cookie)) && 1232 (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) { 1233 struct sctp_error_stale_cookie *stale_cookie; 1234 1235 stale_cookie = (struct sctp_error_stale_cookie *)cause; 1236 asoc->cookie_preserve_req = ntohl(stale_cookie->stale_time); 1237 /* Double it to be more robust on RTX */ 1238 if (asoc->cookie_preserve_req <= UINT32_MAX / 2) { 1239 asoc->cookie_preserve_req *= 2; 1240 } else { 1241 asoc->cookie_preserve_req = UINT32_MAX; 1242 } 1243 asoc->stale_cookie_count++; 1244 if (asoc->stale_cookie_count > 1245 asoc->max_init_times) { 1246 sctp_abort_notification(stcb, 0, 0, NULL, SCTP_SO_NOT_LOCKED); 1247 /* now free the asoc */ 1248 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1249 so = SCTP_INP_SO(stcb->sctp_ep); 1250 atomic_add_int(&stcb->asoc.refcnt, 1); 1251 SCTP_TCB_UNLOCK(stcb); 1252 SCTP_SOCKET_LOCK(so, 1); 1253 SCTP_TCB_LOCK(stcb); 1254 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1255 #endif 1256 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1257 SCTP_FROM_SCTP_INPUT + SCTP_LOC_12); 1258 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1259 SCTP_SOCKET_UNLOCK(so, 1); 1260 #endif 1261 return (-1); 1262 } 1263 /* blast back to INIT state */ 1264 sctp_toss_old_cookies(stcb, &stcb->asoc); 1265 asoc->state &= ~SCTP_STATE_COOKIE_ECHOED; 1266 asoc->state |= SCTP_STATE_COOKIE_WAIT; 1267 sctp_stop_all_cookie_timers(stcb); 1268 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 1269 } 1270 break; 1271 case SCTP_CAUSE_UNRESOLVABLE_ADDR: 1272 /* 1273 * Nothing we can do here, we don't do hostname 1274 * addresses so if the peer does not like my IPv6 1275 * (or IPv4 for that matter) it does not matter. If 1276 * they don't support that type of address, they can 1277 * NOT possibly get that packet type... i.e. with no 1278 * IPv6 you can't receive a IPv6 packet. so we can 1279 * safely ignore this one. If we ever added support 1280 * for HOSTNAME Addresses, then we would need to do 1281 * something here. 1282 */ 1283 break; 1284 case SCTP_CAUSE_UNRECOG_CHUNK: 1285 if (cause_length >= sizeof(struct sctp_error_unrecognized_chunk)) { 1286 struct sctp_error_unrecognized_chunk *unrec_chunk; 1287 1288 unrec_chunk = (struct sctp_error_unrecognized_chunk *)cause; 1289 sctp_process_unrecog_chunk(stcb, unrec_chunk->ch.chunk_type, net); 1290 } 1291 break; 1292 case SCTP_CAUSE_UNRECOG_PARAM: 1293 /* XXX: We only consider the first parameter */ 1294 if (cause_length >= sizeof(struct sctp_error_cause) + sizeof(struct sctp_paramhdr)) { 1295 struct sctp_paramhdr *unrec_parameter; 1296 1297 unrec_parameter = (struct sctp_paramhdr *)(cause + 1); 1298 sctp_process_unrecog_param(stcb, ntohs(unrec_parameter->param_type)); 1299 } 1300 break; 1301 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN: 1302 /* 1303 * We ignore this since the timer will drive out a 1304 * new cookie anyway and there timer will drive us 1305 * to send a SHUTDOWN_COMPLETE. We can't send one 1306 * here since we don't have their tag. 1307 */ 1308 break; 1309 case SCTP_CAUSE_DELETING_LAST_ADDR: 1310 case SCTP_CAUSE_RESOURCE_SHORTAGE: 1311 case SCTP_CAUSE_DELETING_SRC_ADDR: 1312 /* 1313 * We should NOT get these here, but in a 1314 * ASCONF-ACK. 1315 */ 1316 SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a error cause with code %u.\n", 1317 cause_code); 1318 break; 1319 case SCTP_CAUSE_OUT_OF_RESC: 1320 /* 1321 * And what, pray tell do we do with the fact that 1322 * the peer is out of resources? Not really sure we 1323 * could do anything but abort. I suspect this 1324 * should have came WITH an abort instead of in a 1325 * OP-ERROR. 1326 */ 1327 break; 1328 default: 1329 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown code 0x%x\n", 1330 cause_code); 1331 break; 1332 } 1333 adjust = SCTP_SIZE32(cause_length); 1334 if (remaining_length >= adjust) { 1335 remaining_length -= adjust; 1336 } else { 1337 remaining_length = 0; 1338 } 1339 cause = (struct sctp_error_cause *)((caddr_t)cause + adjust); 1340 } 1341 sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, code, ch, SCTP_SO_NOT_LOCKED); 1342 return (0); 1343 } 1344 1345 static int 1346 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset, 1347 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 1348 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 1349 struct sctp_nets *net, int *abort_no_unlock, 1350 uint8_t mflowtype, uint32_t mflowid, 1351 uint32_t vrf_id) 1352 { 1353 struct sctp_init_ack *init_ack; 1354 struct mbuf *op_err; 1355 1356 SCTPDBG(SCTP_DEBUG_INPUT2, 1357 "sctp_handle_init_ack: handling INIT-ACK\n"); 1358 1359 if (stcb == NULL) { 1360 SCTPDBG(SCTP_DEBUG_INPUT2, 1361 "sctp_handle_init_ack: TCB is null\n"); 1362 return (-1); 1363 } 1364 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) { 1365 /* Invalid length */ 1366 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1367 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1368 src, dst, sh, op_err, 1369 mflowtype, mflowid, 1370 vrf_id, net->port); 1371 *abort_no_unlock = 1; 1372 return (-1); 1373 } 1374 init_ack = &cp->init; 1375 /* validate parameters */ 1376 if (init_ack->initiate_tag == 0) { 1377 /* protocol error... send an abort */ 1378 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1379 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1380 src, dst, sh, op_err, 1381 mflowtype, mflowid, 1382 vrf_id, net->port); 1383 *abort_no_unlock = 1; 1384 return (-1); 1385 } 1386 if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) { 1387 /* protocol error... send an abort */ 1388 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1389 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1390 src, dst, sh, op_err, 1391 mflowtype, mflowid, 1392 vrf_id, net->port); 1393 *abort_no_unlock = 1; 1394 return (-1); 1395 } 1396 if (init_ack->num_inbound_streams == 0) { 1397 /* protocol error... send an abort */ 1398 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1399 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1400 src, dst, sh, op_err, 1401 mflowtype, mflowid, 1402 vrf_id, net->port); 1403 *abort_no_unlock = 1; 1404 return (-1); 1405 } 1406 if (init_ack->num_outbound_streams == 0) { 1407 /* protocol error... send an abort */ 1408 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1409 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1410 src, dst, sh, op_err, 1411 mflowtype, mflowid, 1412 vrf_id, net->port); 1413 *abort_no_unlock = 1; 1414 return (-1); 1415 } 1416 /* process according to association state... */ 1417 switch (stcb->asoc.state & SCTP_STATE_MASK) { 1418 case SCTP_STATE_COOKIE_WAIT: 1419 /* this is the expected state for this chunk */ 1420 /* process the INIT-ACK parameters */ 1421 if (stcb->asoc.primary_destination->dest_state & 1422 SCTP_ADDR_UNCONFIRMED) { 1423 /* 1424 * The primary is where we sent the INIT, we can 1425 * always consider it confirmed when the INIT-ACK is 1426 * returned. Do this before we load addresses 1427 * though. 1428 */ 1429 stcb->asoc.primary_destination->dest_state &= 1430 ~SCTP_ADDR_UNCONFIRMED; 1431 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 1432 stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED); 1433 } 1434 if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb, 1435 net, abort_no_unlock, 1436 mflowtype, mflowid, 1437 vrf_id) < 0) { 1438 /* error in parsing parameters */ 1439 return (-1); 1440 } 1441 /* update our state */ 1442 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n"); 1443 SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_ECHOED); 1444 1445 /* reset the RTO calc */ 1446 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 1447 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 1448 stcb->asoc.overall_error_count, 1449 0, 1450 SCTP_FROM_SCTP_INPUT, 1451 __LINE__); 1452 } 1453 stcb->asoc.overall_error_count = 0; 1454 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 1455 /* 1456 * collapse the init timer back in case of a exponential 1457 * backoff 1458 */ 1459 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep, 1460 stcb, net); 1461 /* 1462 * the send at the end of the inbound data processing will 1463 * cause the cookie to be sent 1464 */ 1465 break; 1466 case SCTP_STATE_SHUTDOWN_SENT: 1467 /* incorrect state... discard */ 1468 break; 1469 case SCTP_STATE_COOKIE_ECHOED: 1470 /* incorrect state... discard */ 1471 break; 1472 case SCTP_STATE_OPEN: 1473 /* incorrect state... discard */ 1474 break; 1475 case SCTP_STATE_EMPTY: 1476 case SCTP_STATE_INUSE: 1477 default: 1478 /* incorrect state... discard */ 1479 return (-1); 1480 break; 1481 } 1482 SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n"); 1483 return (0); 1484 } 1485 1486 static struct sctp_tcb * 1487 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1488 struct sockaddr *src, struct sockaddr *dst, 1489 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1490 struct sctp_inpcb *inp, struct sctp_nets **netp, 1491 struct sockaddr *init_src, int *notification, 1492 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1493 uint8_t mflowtype, uint32_t mflowid, 1494 uint32_t vrf_id, uint16_t port); 1495 1496 1497 /* 1498 * handle a state cookie for an existing association m: input packet mbuf 1499 * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a 1500 * "split" mbuf and the cookie signature does not exist offset: offset into 1501 * mbuf to the cookie-echo chunk 1502 */ 1503 static struct sctp_tcb * 1504 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset, 1505 struct sockaddr *src, struct sockaddr *dst, 1506 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1507 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp, 1508 struct sockaddr *init_src, int *notification, 1509 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1510 uint8_t mflowtype, uint32_t mflowid, 1511 uint32_t vrf_id, uint16_t port) 1512 { 1513 struct sctp_association *asoc; 1514 struct sctp_init_chunk *init_cp, init_buf; 1515 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1516 struct sctp_nets *net; 1517 struct mbuf *op_err; 1518 struct timeval old; 1519 int init_offset, initack_offset, i; 1520 int retval; 1521 int spec_flag = 0; 1522 uint32_t how_indx; 1523 #if defined(SCTP_DETAILED_STR_STATS) 1524 int j; 1525 #endif 1526 1527 net = *netp; 1528 /* I know that the TCB is non-NULL from the caller */ 1529 asoc = &stcb->asoc; 1530 for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) { 1531 if (asoc->cookie_how[how_indx] == 0) 1532 break; 1533 } 1534 if (how_indx < sizeof(asoc->cookie_how)) { 1535 asoc->cookie_how[how_indx] = 1; 1536 } 1537 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 1538 /* SHUTDOWN came in after sending INIT-ACK */ 1539 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination); 1540 op_err = sctp_generate_cause(SCTP_CAUSE_COOKIE_IN_SHUTDOWN, ""); 1541 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 1542 mflowtype, mflowid, inp->fibnum, 1543 vrf_id, net->port); 1544 if (how_indx < sizeof(asoc->cookie_how)) 1545 asoc->cookie_how[how_indx] = 2; 1546 return (NULL); 1547 } 1548 /* 1549 * find and validate the INIT chunk in the cookie (peer's info) the 1550 * INIT should start after the cookie-echo header struct (chunk 1551 * header, state cookie header struct) 1552 */ 1553 init_offset = offset += sizeof(struct sctp_cookie_echo_chunk); 1554 1555 init_cp = (struct sctp_init_chunk *) 1556 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 1557 (uint8_t *)&init_buf); 1558 if (init_cp == NULL) { 1559 /* could not pull a INIT chunk in cookie */ 1560 return (NULL); 1561 } 1562 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 1563 return (NULL); 1564 } 1565 /* 1566 * find and validate the INIT-ACK chunk in the cookie (my info) the 1567 * INIT-ACK follows the INIT chunk 1568 */ 1569 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 1570 initack_cp = (struct sctp_init_ack_chunk *) 1571 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 1572 (uint8_t *)&initack_buf); 1573 if (initack_cp == NULL) { 1574 /* could not pull INIT-ACK chunk in cookie */ 1575 return (NULL); 1576 } 1577 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 1578 return (NULL); 1579 } 1580 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1581 (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) { 1582 /* 1583 * case D in Section 5.2.4 Table 2: MMAA process accordingly 1584 * to get into the OPEN state 1585 */ 1586 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1587 /*- 1588 * Opps, this means that we somehow generated two vtag's 1589 * the same. I.e. we did: 1590 * Us Peer 1591 * <---INIT(tag=a)------ 1592 * ----INIT-ACK(tag=t)--> 1593 * ----INIT(tag=t)------> *1 1594 * <---INIT-ACK(tag=a)--- 1595 * <----CE(tag=t)------------- *2 1596 * 1597 * At point *1 we should be generating a different 1598 * tag t'. Which means we would throw away the CE and send 1599 * ours instead. Basically this is case C (throw away side). 1600 */ 1601 if (how_indx < sizeof(asoc->cookie_how)) 1602 asoc->cookie_how[how_indx] = 17; 1603 return (NULL); 1604 1605 } 1606 switch (SCTP_GET_STATE(asoc)) { 1607 case SCTP_STATE_COOKIE_WAIT: 1608 case SCTP_STATE_COOKIE_ECHOED: 1609 /* 1610 * INIT was sent but got a COOKIE_ECHO with the 1611 * correct tags... just accept it...but we must 1612 * process the init so that we can make sure we have 1613 * the right seq no's. 1614 */ 1615 /* First we must process the INIT !! */ 1616 retval = sctp_process_init(init_cp, stcb); 1617 if (retval < 0) { 1618 if (how_indx < sizeof(asoc->cookie_how)) 1619 asoc->cookie_how[how_indx] = 3; 1620 return (NULL); 1621 } 1622 /* we have already processed the INIT so no problem */ 1623 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, 1624 stcb, net, 1625 SCTP_FROM_SCTP_INPUT + SCTP_LOC_13); 1626 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, 1627 stcb, net, 1628 SCTP_FROM_SCTP_INPUT + SCTP_LOC_14); 1629 /* update current state */ 1630 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) 1631 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1632 else 1633 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1634 1635 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1636 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1637 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1638 stcb->sctp_ep, stcb, asoc->primary_destination); 1639 } 1640 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1641 sctp_stop_all_cookie_timers(stcb); 1642 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1643 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1644 (!SCTP_IS_LISTENING(inp))) { 1645 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1646 struct socket *so; 1647 #endif 1648 /* 1649 * Here is where collision would go if we 1650 * did a connect() and instead got a 1651 * init/init-ack/cookie done before the 1652 * init-ack came back.. 1653 */ 1654 stcb->sctp_ep->sctp_flags |= 1655 SCTP_PCB_FLAGS_CONNECTED; 1656 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1657 so = SCTP_INP_SO(stcb->sctp_ep); 1658 atomic_add_int(&stcb->asoc.refcnt, 1); 1659 SCTP_TCB_UNLOCK(stcb); 1660 SCTP_SOCKET_LOCK(so, 1); 1661 SCTP_TCB_LOCK(stcb); 1662 atomic_add_int(&stcb->asoc.refcnt, -1); 1663 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1664 SCTP_SOCKET_UNLOCK(so, 1); 1665 return (NULL); 1666 } 1667 #endif 1668 soisconnected(stcb->sctp_socket); 1669 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1670 SCTP_SOCKET_UNLOCK(so, 1); 1671 #endif 1672 } 1673 /* notify upper layer */ 1674 *notification = SCTP_NOTIFY_ASSOC_UP; 1675 /* 1676 * since we did not send a HB make sure we don't 1677 * double things 1678 */ 1679 old.tv_sec = cookie->time_entered.tv_sec; 1680 old.tv_usec = cookie->time_entered.tv_usec; 1681 net->hb_responded = 1; 1682 net->RTO = sctp_calculate_rto(stcb, asoc, net, 1683 &old, 1684 SCTP_RTT_FROM_NON_DATA); 1685 1686 if (stcb->asoc.sctp_autoclose_ticks && 1687 (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) { 1688 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 1689 inp, stcb, NULL); 1690 } 1691 break; 1692 default: 1693 /* 1694 * we're in the OPEN state (or beyond), so peer must 1695 * have simply lost the COOKIE-ACK 1696 */ 1697 break; 1698 } /* end switch */ 1699 sctp_stop_all_cookie_timers(stcb); 1700 /* 1701 * We ignore the return code here.. not sure if we should 1702 * somehow abort.. but we do have an existing asoc. This 1703 * really should not fail. 1704 */ 1705 if (sctp_load_addresses_from_init(stcb, m, 1706 init_offset + sizeof(struct sctp_init_chunk), 1707 initack_offset, src, dst, init_src, stcb->asoc.port)) { 1708 if (how_indx < sizeof(asoc->cookie_how)) 1709 asoc->cookie_how[how_indx] = 4; 1710 return (NULL); 1711 } 1712 /* respond with a COOKIE-ACK */ 1713 sctp_toss_old_cookies(stcb, asoc); 1714 sctp_send_cookie_ack(stcb); 1715 if (how_indx < sizeof(asoc->cookie_how)) 1716 asoc->cookie_how[how_indx] = 5; 1717 return (stcb); 1718 } 1719 if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1720 ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag && 1721 cookie->tie_tag_my_vtag == 0 && 1722 cookie->tie_tag_peer_vtag == 0) { 1723 /* 1724 * case C in Section 5.2.4 Table 2: XMOO silently discard 1725 */ 1726 if (how_indx < sizeof(asoc->cookie_how)) 1727 asoc->cookie_how[how_indx] = 6; 1728 return (NULL); 1729 } 1730 /* 1731 * If nat support, and the below and stcb is established, send back 1732 * a ABORT(colliding state) if we are established. 1733 */ 1734 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) && 1735 (asoc->peer_supports_nat) && 1736 ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1737 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1738 (asoc->peer_vtag == 0)))) { 1739 /* 1740 * Special case - Peer's support nat. We may have two init's 1741 * that we gave out the same tag on since one was not 1742 * established.. i.e. we get INIT from host-1 behind the nat 1743 * and we respond tag-a, we get a INIT from host-2 behind 1744 * the nat and we get tag-a again. Then we bring up host-1 1745 * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1). 1746 * Now we have colliding state. We must send an abort here 1747 * with colliding state indication. 1748 */ 1749 op_err = sctp_generate_cause(SCTP_CAUSE_NAT_COLLIDING_STATE, ""); 1750 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err, 1751 mflowtype, mflowid, inp->fibnum, 1752 vrf_id, port); 1753 return (NULL); 1754 } 1755 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1756 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1757 (asoc->peer_vtag == 0))) { 1758 /* 1759 * case B in Section 5.2.4 Table 2: MXAA or MOAA my info 1760 * should be ok, re-accept peer info 1761 */ 1762 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1763 /* 1764 * Extension of case C. If we hit this, then the 1765 * random number generator returned the same vtag 1766 * when we first sent our INIT-ACK and when we later 1767 * sent our INIT. The side with the seq numbers that 1768 * are different will be the one that normnally 1769 * would have hit case C. This in effect "extends" 1770 * our vtags in this collision case to be 64 bits. 1771 * The same collision could occur aka you get both 1772 * vtag and seq number the same twice in a row.. but 1773 * is much less likely. If it did happen then we 1774 * would proceed through and bring up the assoc.. we 1775 * may end up with the wrong stream setup however.. 1776 * which would be bad.. but there is no way to 1777 * tell.. until we send on a stream that does not 1778 * exist :-) 1779 */ 1780 if (how_indx < sizeof(asoc->cookie_how)) 1781 asoc->cookie_how[how_indx] = 7; 1782 1783 return (NULL); 1784 } 1785 if (how_indx < sizeof(asoc->cookie_how)) 1786 asoc->cookie_how[how_indx] = 8; 1787 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, 1788 SCTP_FROM_SCTP_INPUT + SCTP_LOC_15); 1789 sctp_stop_all_cookie_timers(stcb); 1790 /* 1791 * since we did not send a HB make sure we don't double 1792 * things 1793 */ 1794 net->hb_responded = 1; 1795 if (stcb->asoc.sctp_autoclose_ticks && 1796 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 1797 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, 1798 NULL); 1799 } 1800 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1801 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 1802 1803 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) { 1804 /* 1805 * Ok the peer probably discarded our data (if we 1806 * echoed a cookie+data). So anything on the 1807 * sent_queue should be marked for retransmit, we 1808 * may not get something to kick us so it COULD 1809 * still take a timeout to move these.. but it can't 1810 * hurt to mark them. 1811 */ 1812 struct sctp_tmit_chunk *chk; 1813 1814 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 1815 if (chk->sent < SCTP_DATAGRAM_RESEND) { 1816 chk->sent = SCTP_DATAGRAM_RESEND; 1817 sctp_flight_size_decrease(chk); 1818 sctp_total_flight_decrease(stcb, chk); 1819 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 1820 spec_flag++; 1821 } 1822 } 1823 1824 } 1825 /* process the INIT info (peer's info) */ 1826 retval = sctp_process_init(init_cp, stcb); 1827 if (retval < 0) { 1828 if (how_indx < sizeof(asoc->cookie_how)) 1829 asoc->cookie_how[how_indx] = 9; 1830 return (NULL); 1831 } 1832 if (sctp_load_addresses_from_init(stcb, m, 1833 init_offset + sizeof(struct sctp_init_chunk), 1834 initack_offset, src, dst, init_src, stcb->asoc.port)) { 1835 if (how_indx < sizeof(asoc->cookie_how)) 1836 asoc->cookie_how[how_indx] = 10; 1837 return (NULL); 1838 } 1839 if ((asoc->state & SCTP_STATE_COOKIE_WAIT) || 1840 (asoc->state & SCTP_STATE_COOKIE_ECHOED)) { 1841 *notification = SCTP_NOTIFY_ASSOC_UP; 1842 1843 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1844 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1845 (!SCTP_IS_LISTENING(inp))) { 1846 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1847 struct socket *so; 1848 #endif 1849 stcb->sctp_ep->sctp_flags |= 1850 SCTP_PCB_FLAGS_CONNECTED; 1851 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1852 so = SCTP_INP_SO(stcb->sctp_ep); 1853 atomic_add_int(&stcb->asoc.refcnt, 1); 1854 SCTP_TCB_UNLOCK(stcb); 1855 SCTP_SOCKET_LOCK(so, 1); 1856 SCTP_TCB_LOCK(stcb); 1857 atomic_add_int(&stcb->asoc.refcnt, -1); 1858 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1859 SCTP_SOCKET_UNLOCK(so, 1); 1860 return (NULL); 1861 } 1862 #endif 1863 soisconnected(stcb->sctp_socket); 1864 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1865 SCTP_SOCKET_UNLOCK(so, 1); 1866 #endif 1867 } 1868 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) 1869 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1870 else 1871 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1872 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1873 } else if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) { 1874 SCTP_STAT_INCR_COUNTER32(sctps_restartestab); 1875 } else { 1876 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1877 } 1878 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1879 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1880 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1881 stcb->sctp_ep, stcb, asoc->primary_destination); 1882 } 1883 sctp_stop_all_cookie_timers(stcb); 1884 sctp_toss_old_cookies(stcb, asoc); 1885 sctp_send_cookie_ack(stcb); 1886 if (spec_flag) { 1887 /* 1888 * only if we have retrans set do we do this. What 1889 * this call does is get only the COOKIE-ACK out and 1890 * then when we return the normal call to 1891 * sctp_chunk_output will get the retrans out behind 1892 * this. 1893 */ 1894 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED); 1895 } 1896 if (how_indx < sizeof(asoc->cookie_how)) 1897 asoc->cookie_how[how_indx] = 11; 1898 1899 return (stcb); 1900 } 1901 if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1902 ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) && 1903 cookie->tie_tag_my_vtag == asoc->my_vtag_nonce && 1904 cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce && 1905 cookie->tie_tag_peer_vtag != 0) { 1906 struct sctpasochead *head; 1907 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1908 struct socket *so; 1909 #endif 1910 1911 if (asoc->peer_supports_nat) { 1912 /* 1913 * This is a gross gross hack. Just call the 1914 * cookie_new code since we are allowing a duplicate 1915 * association. I hope this works... 1916 */ 1917 return (sctp_process_cookie_new(m, iphlen, offset, src, dst, 1918 sh, cookie, cookie_len, 1919 inp, netp, init_src, notification, 1920 auth_skipped, auth_offset, auth_len, 1921 mflowtype, mflowid, 1922 vrf_id, port)); 1923 } 1924 /* 1925 * case A in Section 5.2.4 Table 2: XXMM (peer restarted) 1926 */ 1927 /* temp code */ 1928 if (how_indx < sizeof(asoc->cookie_how)) 1929 asoc->cookie_how[how_indx] = 12; 1930 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, 1931 SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 1932 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, 1933 SCTP_FROM_SCTP_INPUT + SCTP_LOC_17); 1934 1935 /* notify upper layer */ 1936 *notification = SCTP_NOTIFY_ASSOC_RESTART; 1937 atomic_add_int(&stcb->asoc.refcnt, 1); 1938 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_OPEN) && 1939 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) && 1940 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) { 1941 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1942 } 1943 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) { 1944 SCTP_STAT_INCR_GAUGE32(sctps_restartestab); 1945 } else if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) { 1946 SCTP_STAT_INCR_GAUGE32(sctps_collisionestab); 1947 } 1948 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1949 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1950 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1951 stcb->sctp_ep, stcb, asoc->primary_destination); 1952 1953 } else if (!(asoc->state & SCTP_STATE_SHUTDOWN_SENT)) { 1954 /* move to OPEN state, if not in SHUTDOWN_SENT */ 1955 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1956 } 1957 asoc->pre_open_streams = 1958 ntohs(initack_cp->init.num_outbound_streams); 1959 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 1960 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 1961 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 1962 1963 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 1964 1965 asoc->str_reset_seq_in = asoc->init_seq_number; 1966 1967 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 1968 if (asoc->mapping_array) { 1969 memset(asoc->mapping_array, 0, 1970 asoc->mapping_array_size); 1971 } 1972 if (asoc->nr_mapping_array) { 1973 memset(asoc->nr_mapping_array, 0, 1974 asoc->mapping_array_size); 1975 } 1976 SCTP_TCB_UNLOCK(stcb); 1977 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1978 so = SCTP_INP_SO(stcb->sctp_ep); 1979 SCTP_SOCKET_LOCK(so, 1); 1980 #endif 1981 SCTP_INP_INFO_WLOCK(); 1982 SCTP_INP_WLOCK(stcb->sctp_ep); 1983 SCTP_TCB_LOCK(stcb); 1984 atomic_add_int(&stcb->asoc.refcnt, -1); 1985 /* send up all the data */ 1986 SCTP_TCB_SEND_LOCK(stcb); 1987 1988 sctp_report_all_outbound(stcb, 0, 1, SCTP_SO_LOCKED); 1989 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 1990 stcb->asoc.strmout[i].chunks_on_queues = 0; 1991 #if defined(SCTP_DETAILED_STR_STATS) 1992 for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) { 1993 asoc->strmout[i].abandoned_sent[j] = 0; 1994 asoc->strmout[i].abandoned_unsent[j] = 0; 1995 } 1996 #else 1997 asoc->strmout[i].abandoned_sent[0] = 0; 1998 asoc->strmout[i].abandoned_unsent[0] = 0; 1999 #endif 2000 stcb->asoc.strmout[i].sid = i; 2001 stcb->asoc.strmout[i].next_mid_ordered = 0; 2002 stcb->asoc.strmout[i].next_mid_unordered = 0; 2003 stcb->asoc.strmout[i].last_msg_incomplete = 0; 2004 } 2005 /* process the INIT-ACK info (my info) */ 2006 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 2007 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 2008 2009 /* pull from vtag hash */ 2010 LIST_REMOVE(stcb, sctp_asocs); 2011 /* re-insert to new vtag position */ 2012 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, 2013 SCTP_BASE_INFO(hashasocmark))]; 2014 /* 2015 * put it in the bucket in the vtag hash of assoc's for the 2016 * system 2017 */ 2018 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 2019 2020 SCTP_TCB_SEND_UNLOCK(stcb); 2021 SCTP_INP_WUNLOCK(stcb->sctp_ep); 2022 SCTP_INP_INFO_WUNLOCK(); 2023 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2024 SCTP_SOCKET_UNLOCK(so, 1); 2025 #endif 2026 asoc->total_flight = 0; 2027 asoc->total_flight_count = 0; 2028 /* process the INIT info (peer's info) */ 2029 retval = sctp_process_init(init_cp, stcb); 2030 if (retval < 0) { 2031 if (how_indx < sizeof(asoc->cookie_how)) 2032 asoc->cookie_how[how_indx] = 13; 2033 2034 return (NULL); 2035 } 2036 /* 2037 * since we did not send a HB make sure we don't double 2038 * things 2039 */ 2040 net->hb_responded = 1; 2041 2042 if (sctp_load_addresses_from_init(stcb, m, 2043 init_offset + sizeof(struct sctp_init_chunk), 2044 initack_offset, src, dst, init_src, stcb->asoc.port)) { 2045 if (how_indx < sizeof(asoc->cookie_how)) 2046 asoc->cookie_how[how_indx] = 14; 2047 2048 return (NULL); 2049 } 2050 /* respond with a COOKIE-ACK */ 2051 sctp_stop_all_cookie_timers(stcb); 2052 sctp_toss_old_cookies(stcb, asoc); 2053 sctp_send_cookie_ack(stcb); 2054 if (how_indx < sizeof(asoc->cookie_how)) 2055 asoc->cookie_how[how_indx] = 15; 2056 2057 return (stcb); 2058 } 2059 if (how_indx < sizeof(asoc->cookie_how)) 2060 asoc->cookie_how[how_indx] = 16; 2061 /* all other cases... */ 2062 return (NULL); 2063 } 2064 2065 2066 /* 2067 * handle a state cookie for a new association m: input packet mbuf chain-- 2068 * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf 2069 * and the cookie signature does not exist offset: offset into mbuf to the 2070 * cookie-echo chunk length: length of the cookie chunk to: where the init 2071 * was from returns a new TCB 2072 */ 2073 static struct sctp_tcb * 2074 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 2075 struct sockaddr *src, struct sockaddr *dst, 2076 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 2077 struct sctp_inpcb *inp, struct sctp_nets **netp, 2078 struct sockaddr *init_src, int *notification, 2079 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2080 uint8_t mflowtype, uint32_t mflowid, 2081 uint32_t vrf_id, uint16_t port) 2082 { 2083 struct sctp_tcb *stcb; 2084 struct sctp_init_chunk *init_cp, init_buf; 2085 struct sctp_init_ack_chunk *initack_cp, initack_buf; 2086 union sctp_sockstore store; 2087 struct sctp_association *asoc; 2088 int init_offset, initack_offset, initack_limit; 2089 int retval; 2090 int error = 0; 2091 uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE]; 2092 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2093 struct socket *so; 2094 2095 so = SCTP_INP_SO(inp); 2096 #endif 2097 2098 /* 2099 * find and validate the INIT chunk in the cookie (peer's info) the 2100 * INIT should start after the cookie-echo header struct (chunk 2101 * header, state cookie header struct) 2102 */ 2103 init_offset = offset + sizeof(struct sctp_cookie_echo_chunk); 2104 init_cp = (struct sctp_init_chunk *) 2105 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 2106 (uint8_t *)&init_buf); 2107 if (init_cp == NULL) { 2108 /* could not pull a INIT chunk in cookie */ 2109 SCTPDBG(SCTP_DEBUG_INPUT1, 2110 "process_cookie_new: could not pull INIT chunk hdr\n"); 2111 return (NULL); 2112 } 2113 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 2114 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n"); 2115 return (NULL); 2116 } 2117 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 2118 /* 2119 * find and validate the INIT-ACK chunk in the cookie (my info) the 2120 * INIT-ACK follows the INIT chunk 2121 */ 2122 initack_cp = (struct sctp_init_ack_chunk *) 2123 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 2124 (uint8_t *)&initack_buf); 2125 if (initack_cp == NULL) { 2126 /* could not pull INIT-ACK chunk in cookie */ 2127 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n"); 2128 return (NULL); 2129 } 2130 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 2131 return (NULL); 2132 } 2133 /* 2134 * NOTE: We can't use the INIT_ACK's chk_length to determine the 2135 * "initack_limit" value. This is because the chk_length field 2136 * includes the length of the cookie, but the cookie is omitted when 2137 * the INIT and INIT_ACK are tacked onto the cookie... 2138 */ 2139 initack_limit = offset + cookie_len; 2140 2141 /* 2142 * now that we know the INIT/INIT-ACK are in place, create a new TCB 2143 * and popluate 2144 */ 2145 2146 /* 2147 * Here we do a trick, we set in NULL for the proc/thread argument. 2148 * We do this since in effect we only use the p argument when the 2149 * socket is unbound and we must do an implicit bind. Since we are 2150 * getting a cookie, we cannot be unbound. 2151 */ 2152 stcb = sctp_aloc_assoc(inp, init_src, &error, 2153 ntohl(initack_cp->init.initiate_tag), vrf_id, 2154 ntohs(initack_cp->init.num_outbound_streams), 2155 port, 2156 (struct thread *)NULL 2157 ); 2158 if (stcb == NULL) { 2159 struct mbuf *op_err; 2160 2161 /* memory problem? */ 2162 SCTPDBG(SCTP_DEBUG_INPUT1, 2163 "process_cookie_new: no room for another TCB!\n"); 2164 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2165 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2166 src, dst, sh, op_err, 2167 mflowtype, mflowid, 2168 vrf_id, port); 2169 return (NULL); 2170 } 2171 /* get the correct sctp_nets */ 2172 if (netp) 2173 *netp = sctp_findnet(stcb, init_src); 2174 2175 asoc = &stcb->asoc; 2176 /* get scope variables out of cookie */ 2177 asoc->scope.ipv4_local_scope = cookie->ipv4_scope; 2178 asoc->scope.site_scope = cookie->site_scope; 2179 asoc->scope.local_scope = cookie->local_scope; 2180 asoc->scope.loopback_scope = cookie->loopback_scope; 2181 2182 if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) || 2183 (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) { 2184 struct mbuf *op_err; 2185 2186 /* 2187 * Houston we have a problem. The EP changed while the 2188 * cookie was in flight. Only recourse is to abort the 2189 * association. 2190 */ 2191 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2192 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2193 src, dst, sh, op_err, 2194 mflowtype, mflowid, 2195 vrf_id, port); 2196 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2197 atomic_add_int(&stcb->asoc.refcnt, 1); 2198 SCTP_TCB_UNLOCK(stcb); 2199 SCTP_SOCKET_LOCK(so, 1); 2200 SCTP_TCB_LOCK(stcb); 2201 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2202 #endif 2203 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2204 SCTP_FROM_SCTP_INPUT + SCTP_LOC_18); 2205 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2206 SCTP_SOCKET_UNLOCK(so, 1); 2207 #endif 2208 return (NULL); 2209 } 2210 /* process the INIT-ACK info (my info) */ 2211 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 2212 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 2213 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 2214 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 2215 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 2216 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 2217 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 2218 asoc->str_reset_seq_in = asoc->init_seq_number; 2219 2220 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 2221 2222 /* process the INIT info (peer's info) */ 2223 if (netp) 2224 retval = sctp_process_init(init_cp, stcb); 2225 else 2226 retval = 0; 2227 if (retval < 0) { 2228 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2229 atomic_add_int(&stcb->asoc.refcnt, 1); 2230 SCTP_TCB_UNLOCK(stcb); 2231 SCTP_SOCKET_LOCK(so, 1); 2232 SCTP_TCB_LOCK(stcb); 2233 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2234 #endif 2235 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2236 SCTP_FROM_SCTP_INPUT + SCTP_LOC_19); 2237 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2238 SCTP_SOCKET_UNLOCK(so, 1); 2239 #endif 2240 return (NULL); 2241 } 2242 /* load all addresses */ 2243 if (sctp_load_addresses_from_init(stcb, m, 2244 init_offset + sizeof(struct sctp_init_chunk), initack_offset, 2245 src, dst, init_src, port)) { 2246 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2247 atomic_add_int(&stcb->asoc.refcnt, 1); 2248 SCTP_TCB_UNLOCK(stcb); 2249 SCTP_SOCKET_LOCK(so, 1); 2250 SCTP_TCB_LOCK(stcb); 2251 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2252 #endif 2253 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2254 SCTP_FROM_SCTP_INPUT + SCTP_LOC_20); 2255 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2256 SCTP_SOCKET_UNLOCK(so, 1); 2257 #endif 2258 return (NULL); 2259 } 2260 /* 2261 * verify any preceding AUTH chunk that was skipped 2262 */ 2263 /* pull the local authentication parameters from the cookie/init-ack */ 2264 sctp_auth_get_cookie_params(stcb, m, 2265 initack_offset + sizeof(struct sctp_init_ack_chunk), 2266 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk))); 2267 if (auth_skipped) { 2268 struct sctp_auth_chunk *auth; 2269 2270 auth = (struct sctp_auth_chunk *) 2271 sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf); 2272 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) { 2273 /* auth HMAC failed, dump the assoc and packet */ 2274 SCTPDBG(SCTP_DEBUG_AUTH1, 2275 "COOKIE-ECHO: AUTH failed\n"); 2276 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2277 atomic_add_int(&stcb->asoc.refcnt, 1); 2278 SCTP_TCB_UNLOCK(stcb); 2279 SCTP_SOCKET_LOCK(so, 1); 2280 SCTP_TCB_LOCK(stcb); 2281 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2282 #endif 2283 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2284 SCTP_FROM_SCTP_INPUT + SCTP_LOC_21); 2285 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2286 SCTP_SOCKET_UNLOCK(so, 1); 2287 #endif 2288 return (NULL); 2289 } else { 2290 /* remaining chunks checked... good to go */ 2291 stcb->asoc.authenticated = 1; 2292 } 2293 } 2294 /* 2295 * if we're doing ASCONFs, check to see if we have any new local 2296 * addresses that need to get added to the peer (eg. addresses 2297 * changed while cookie echo in flight). This needs to be done 2298 * after we go to the OPEN state to do the correct asconf 2299 * processing. else, make sure we have the correct addresses in our 2300 * lists 2301 */ 2302 2303 /* warning, we re-use sin, sin6, sa_store here! */ 2304 /* pull in local_address (our "from" address) */ 2305 switch (cookie->laddr_type) { 2306 #ifdef INET 2307 case SCTP_IPV4_ADDRESS: 2308 /* source addr is IPv4 */ 2309 memset(&store.sin, 0, sizeof(struct sockaddr_in)); 2310 store.sin.sin_family = AF_INET; 2311 store.sin.sin_len = sizeof(struct sockaddr_in); 2312 store.sin.sin_addr.s_addr = cookie->laddress[0]; 2313 break; 2314 #endif 2315 #ifdef INET6 2316 case SCTP_IPV6_ADDRESS: 2317 /* source addr is IPv6 */ 2318 memset(&store.sin6, 0, sizeof(struct sockaddr_in6)); 2319 store.sin6.sin6_family = AF_INET6; 2320 store.sin6.sin6_len = sizeof(struct sockaddr_in6); 2321 store.sin6.sin6_scope_id = cookie->scope_id; 2322 memcpy(&store.sin6.sin6_addr, cookie->laddress, sizeof(struct in6_addr)); 2323 break; 2324 #endif 2325 default: 2326 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2327 atomic_add_int(&stcb->asoc.refcnt, 1); 2328 SCTP_TCB_UNLOCK(stcb); 2329 SCTP_SOCKET_LOCK(so, 1); 2330 SCTP_TCB_LOCK(stcb); 2331 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2332 #endif 2333 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2334 SCTP_FROM_SCTP_INPUT + SCTP_LOC_22); 2335 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2336 SCTP_SOCKET_UNLOCK(so, 1); 2337 #endif 2338 return (NULL); 2339 } 2340 2341 /* update current state */ 2342 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2343 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 2344 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2345 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2346 stcb->sctp_ep, stcb, asoc->primary_destination); 2347 } 2348 sctp_stop_all_cookie_timers(stcb); 2349 SCTP_STAT_INCR_COUNTER32(sctps_passiveestab); 2350 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2351 2352 /* set up to notify upper layer */ 2353 *notification = SCTP_NOTIFY_ASSOC_UP; 2354 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2355 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 2356 (!SCTP_IS_LISTENING(inp))) { 2357 /* 2358 * This is an endpoint that called connect() how it got a 2359 * cookie that is NEW is a bit of a mystery. It must be that 2360 * the INIT was sent, but before it got there.. a complete 2361 * INIT/INIT-ACK/COOKIE arrived. But of course then it 2362 * should have went to the other code.. not here.. oh well.. 2363 * a bit of protection is worth having.. 2364 */ 2365 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2366 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2367 atomic_add_int(&stcb->asoc.refcnt, 1); 2368 SCTP_TCB_UNLOCK(stcb); 2369 SCTP_SOCKET_LOCK(so, 1); 2370 SCTP_TCB_LOCK(stcb); 2371 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2372 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2373 SCTP_SOCKET_UNLOCK(so, 1); 2374 return (NULL); 2375 } 2376 #endif 2377 soisconnected(stcb->sctp_socket); 2378 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2379 SCTP_SOCKET_UNLOCK(so, 1); 2380 #endif 2381 } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 2382 (SCTP_IS_LISTENING(inp))) { 2383 /* 2384 * We don't want to do anything with this one. Since it is 2385 * the listening guy. The timer will get started for 2386 * accepted connections in the caller. 2387 */ 2388 ; 2389 } 2390 /* since we did not send a HB make sure we don't double things */ 2391 if ((netp) && (*netp)) 2392 (*netp)->hb_responded = 1; 2393 2394 if (stcb->asoc.sctp_autoclose_ticks && 2395 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2396 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL); 2397 } 2398 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 2399 if ((netp != NULL) && (*netp != NULL)) { 2400 struct timeval old; 2401 2402 /* calculate the RTT and set the encaps port */ 2403 old.tv_sec = cookie->time_entered.tv_sec; 2404 old.tv_usec = cookie->time_entered.tv_usec; 2405 (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp, 2406 &old, SCTP_RTT_FROM_NON_DATA); 2407 } 2408 /* respond with a COOKIE-ACK */ 2409 sctp_send_cookie_ack(stcb); 2410 2411 /* 2412 * check the address lists for any ASCONFs that need to be sent 2413 * AFTER the cookie-ack is sent 2414 */ 2415 sctp_check_address_list(stcb, m, 2416 initack_offset + sizeof(struct sctp_init_ack_chunk), 2417 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)), 2418 &store.sa, cookie->local_scope, cookie->site_scope, 2419 cookie->ipv4_scope, cookie->loopback_scope); 2420 2421 2422 return (stcb); 2423 } 2424 2425 /* 2426 * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e 2427 * we NEED to make sure we are not already using the vtag. If so we 2428 * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit! 2429 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag, 2430 SCTP_BASE_INFO(hashasocmark))]; 2431 LIST_FOREACH(stcb, head, sctp_asocs) { 2432 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep)) { 2433 -- SEND ABORT - TRY AGAIN -- 2434 } 2435 } 2436 */ 2437 2438 /* 2439 * handles a COOKIE-ECHO message stcb: modified to either a new or left as 2440 * existing (non-NULL) TCB 2441 */ 2442 static struct mbuf * 2443 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset, 2444 struct sockaddr *src, struct sockaddr *dst, 2445 struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp, 2446 struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp, 2447 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2448 struct sctp_tcb **locked_tcb, 2449 uint8_t mflowtype, uint32_t mflowid, 2450 uint32_t vrf_id, uint16_t port) 2451 { 2452 struct sctp_state_cookie *cookie; 2453 struct sctp_tcb *l_stcb = *stcb; 2454 struct sctp_inpcb *l_inp; 2455 struct sockaddr *to; 2456 struct sctp_pcb *ep; 2457 struct mbuf *m_sig; 2458 uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE]; 2459 uint8_t *sig; 2460 uint8_t cookie_ok = 0; 2461 unsigned int sig_offset, cookie_offset; 2462 unsigned int cookie_len; 2463 struct timeval now; 2464 struct timeval time_expires; 2465 int notification = 0; 2466 struct sctp_nets *netl; 2467 int had_a_existing_tcb = 0; 2468 int send_int_conf = 0; 2469 #ifdef INET 2470 struct sockaddr_in sin; 2471 #endif 2472 #ifdef INET6 2473 struct sockaddr_in6 sin6; 2474 #endif 2475 2476 SCTPDBG(SCTP_DEBUG_INPUT2, 2477 "sctp_handle_cookie: handling COOKIE-ECHO\n"); 2478 2479 if (inp_p == NULL) { 2480 return (NULL); 2481 } 2482 cookie = &cp->cookie; 2483 cookie_offset = offset + sizeof(struct sctp_chunkhdr); 2484 cookie_len = ntohs(cp->ch.chunk_length); 2485 2486 if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) + 2487 sizeof(struct sctp_init_chunk) + 2488 sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) { 2489 /* cookie too small */ 2490 return (NULL); 2491 } 2492 if ((cookie->peerport != sh->src_port) || 2493 (cookie->myport != sh->dest_port) || 2494 (cookie->my_vtag != sh->v_tag)) { 2495 /* 2496 * invalid ports or bad tag. Note that we always leave the 2497 * v_tag in the header in network order and when we stored 2498 * it in the my_vtag slot we also left it in network order. 2499 * This maintains the match even though it may be in the 2500 * opposite byte order of the machine :-> 2501 */ 2502 return (NULL); 2503 } 2504 /* 2505 * split off the signature into its own mbuf (since it should not be 2506 * calculated in the sctp_hmac_m() call). 2507 */ 2508 sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE; 2509 m_sig = m_split(m, sig_offset, M_NOWAIT); 2510 if (m_sig == NULL) { 2511 /* out of memory or ?? */ 2512 return (NULL); 2513 } 2514 #ifdef SCTP_MBUF_LOGGING 2515 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 2516 sctp_log_mbc(m_sig, SCTP_MBUF_SPLIT); 2517 } 2518 #endif 2519 2520 /* 2521 * compute the signature/digest for the cookie 2522 */ 2523 ep = &(*inp_p)->sctp_ep; 2524 l_inp = *inp_p; 2525 if (l_stcb) { 2526 SCTP_TCB_UNLOCK(l_stcb); 2527 } 2528 SCTP_INP_RLOCK(l_inp); 2529 if (l_stcb) { 2530 SCTP_TCB_LOCK(l_stcb); 2531 } 2532 /* which cookie is it? */ 2533 if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) && 2534 (ep->current_secret_number != ep->last_secret_number)) { 2535 /* it's the old cookie */ 2536 (void)sctp_hmac_m(SCTP_HMAC, 2537 (uint8_t *)ep->secret_key[(int)ep->last_secret_number], 2538 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2539 } else { 2540 /* it's the current cookie */ 2541 (void)sctp_hmac_m(SCTP_HMAC, 2542 (uint8_t *)ep->secret_key[(int)ep->current_secret_number], 2543 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2544 } 2545 /* get the signature */ 2546 SCTP_INP_RUNLOCK(l_inp); 2547 sig = (uint8_t *)sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *)&tmp_sig); 2548 if (sig == NULL) { 2549 /* couldn't find signature */ 2550 sctp_m_freem(m_sig); 2551 return (NULL); 2552 } 2553 /* compare the received digest with the computed digest */ 2554 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) { 2555 /* try the old cookie? */ 2556 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) && 2557 (ep->current_secret_number != ep->last_secret_number)) { 2558 /* compute digest with old */ 2559 (void)sctp_hmac_m(SCTP_HMAC, 2560 (uint8_t *)ep->secret_key[(int)ep->last_secret_number], 2561 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2562 /* compare */ 2563 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0) 2564 cookie_ok = 1; 2565 } 2566 } else { 2567 cookie_ok = 1; 2568 } 2569 2570 /* 2571 * Now before we continue we must reconstruct our mbuf so that 2572 * normal processing of any other chunks will work. 2573 */ 2574 { 2575 struct mbuf *m_at; 2576 2577 m_at = m; 2578 while (SCTP_BUF_NEXT(m_at) != NULL) { 2579 m_at = SCTP_BUF_NEXT(m_at); 2580 } 2581 SCTP_BUF_NEXT(m_at) = m_sig; 2582 } 2583 2584 if (cookie_ok == 0) { 2585 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n"); 2586 SCTPDBG(SCTP_DEBUG_INPUT2, 2587 "offset = %u, cookie_offset = %u, sig_offset = %u\n", 2588 (uint32_t)offset, cookie_offset, sig_offset); 2589 return (NULL); 2590 } 2591 /* 2592 * check the cookie timestamps to be sure it's not stale 2593 */ 2594 (void)SCTP_GETTIME_TIMEVAL(&now); 2595 /* Expire time is in Ticks, so we convert to seconds */ 2596 time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life); 2597 time_expires.tv_usec = cookie->time_entered.tv_usec; 2598 if (timevalcmp(&now, &time_expires, >)) { 2599 /* cookie is stale! */ 2600 struct mbuf *op_err; 2601 struct sctp_error_stale_cookie *cause; 2602 struct timeval diff; 2603 uint32_t staleness; 2604 2605 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_error_stale_cookie), 2606 0, M_NOWAIT, 1, MT_DATA); 2607 if (op_err == NULL) { 2608 /* FOOBAR */ 2609 return (NULL); 2610 } 2611 /* Set the len */ 2612 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_error_stale_cookie); 2613 cause = mtod(op_err, struct sctp_error_stale_cookie *); 2614 cause->cause.code = htons(SCTP_CAUSE_STALE_COOKIE); 2615 cause->cause.length = htons((sizeof(struct sctp_paramhdr) + 2616 (sizeof(uint32_t)))); 2617 diff = now; 2618 timevalsub(&diff, &time_expires); 2619 if (diff.tv_sec > UINT32_MAX / 1000000) { 2620 staleness = UINT32_MAX; 2621 } else { 2622 staleness = diff.tv_sec * 1000000; 2623 } 2624 if (UINT32_MAX - staleness >= (uint32_t)diff.tv_usec) { 2625 staleness += diff.tv_usec; 2626 } else { 2627 staleness = UINT32_MAX; 2628 } 2629 cause->stale_time = htonl(staleness); 2630 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 2631 mflowtype, mflowid, l_inp->fibnum, 2632 vrf_id, port); 2633 return (NULL); 2634 } 2635 /* 2636 * Now we must see with the lookup address if we have an existing 2637 * asoc. This will only happen if we were in the COOKIE-WAIT state 2638 * and a INIT collided with us and somewhere the peer sent the 2639 * cookie on another address besides the single address our assoc 2640 * had for him. In this case we will have one of the tie-tags set at 2641 * least AND the address field in the cookie can be used to look it 2642 * up. 2643 */ 2644 to = NULL; 2645 switch (cookie->addr_type) { 2646 #ifdef INET6 2647 case SCTP_IPV6_ADDRESS: 2648 memset(&sin6, 0, sizeof(sin6)); 2649 sin6.sin6_family = AF_INET6; 2650 sin6.sin6_len = sizeof(sin6); 2651 sin6.sin6_port = sh->src_port; 2652 sin6.sin6_scope_id = cookie->scope_id; 2653 memcpy(&sin6.sin6_addr.s6_addr, cookie->address, 2654 sizeof(sin6.sin6_addr.s6_addr)); 2655 to = (struct sockaddr *)&sin6; 2656 break; 2657 #endif 2658 #ifdef INET 2659 case SCTP_IPV4_ADDRESS: 2660 memset(&sin, 0, sizeof(sin)); 2661 sin.sin_family = AF_INET; 2662 sin.sin_len = sizeof(sin); 2663 sin.sin_port = sh->src_port; 2664 sin.sin_addr.s_addr = cookie->address[0]; 2665 to = (struct sockaddr *)&sin; 2666 break; 2667 #endif 2668 default: 2669 /* This should not happen */ 2670 return (NULL); 2671 } 2672 if (*stcb == NULL) { 2673 /* Yep, lets check */ 2674 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL); 2675 if (*stcb == NULL) { 2676 /* 2677 * We should have only got back the same inp. If we 2678 * got back a different ep we have a problem. The 2679 * original findep got back l_inp and now 2680 */ 2681 if (l_inp != *inp_p) { 2682 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n"); 2683 } 2684 } else { 2685 if (*locked_tcb == NULL) { 2686 /* 2687 * In this case we found the assoc only 2688 * after we locked the create lock. This 2689 * means we are in a colliding case and we 2690 * must make sure that we unlock the tcb if 2691 * its one of the cases where we throw away 2692 * the incoming packets. 2693 */ 2694 *locked_tcb = *stcb; 2695 2696 /* 2697 * We must also increment the inp ref count 2698 * since the ref_count flags was set when we 2699 * did not find the TCB, now we found it 2700 * which reduces the refcount.. we must 2701 * raise it back out to balance it all :-) 2702 */ 2703 SCTP_INP_INCR_REF((*stcb)->sctp_ep); 2704 if ((*stcb)->sctp_ep != l_inp) { 2705 SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n", 2706 (void *)(*stcb)->sctp_ep, (void *)l_inp); 2707 } 2708 } 2709 } 2710 } 2711 cookie_len -= SCTP_SIGNATURE_SIZE; 2712 if (*stcb == NULL) { 2713 /* this is the "normal" case... get a new TCB */ 2714 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh, 2715 cookie, cookie_len, *inp_p, 2716 netp, to, ¬ification, 2717 auth_skipped, auth_offset, auth_len, 2718 mflowtype, mflowid, 2719 vrf_id, port); 2720 } else { 2721 /* this is abnormal... cookie-echo on existing TCB */ 2722 had_a_existing_tcb = 1; 2723 *stcb = sctp_process_cookie_existing(m, iphlen, offset, 2724 src, dst, sh, 2725 cookie, cookie_len, *inp_p, *stcb, netp, to, 2726 ¬ification, auth_skipped, auth_offset, auth_len, 2727 mflowtype, mflowid, 2728 vrf_id, port); 2729 } 2730 2731 if (*stcb == NULL) { 2732 /* still no TCB... must be bad cookie-echo */ 2733 return (NULL); 2734 } 2735 if (*netp != NULL) { 2736 (*netp)->flowtype = mflowtype; 2737 (*netp)->flowid = mflowid; 2738 } 2739 /* 2740 * Ok, we built an association so confirm the address we sent the 2741 * INIT-ACK to. 2742 */ 2743 netl = sctp_findnet(*stcb, to); 2744 /* 2745 * This code should in theory NOT run but 2746 */ 2747 if (netl == NULL) { 2748 /* TSNH! Huh, why do I need to add this address here? */ 2749 if (sctp_add_remote_addr(*stcb, to, NULL, port, 2750 SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) { 2751 return (NULL); 2752 } 2753 netl = sctp_findnet(*stcb, to); 2754 } 2755 if (netl) { 2756 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) { 2757 netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 2758 (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL, 2759 netl); 2760 send_int_conf = 1; 2761 } 2762 } 2763 sctp_start_net_timers(*stcb); 2764 if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) { 2765 if (!had_a_existing_tcb || 2766 (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) { 2767 /* 2768 * If we have a NEW cookie or the connect never 2769 * reached the connected state during collision we 2770 * must do the TCP accept thing. 2771 */ 2772 struct socket *so, *oso; 2773 struct sctp_inpcb *inp; 2774 2775 if (notification == SCTP_NOTIFY_ASSOC_RESTART) { 2776 /* 2777 * For a restart we will keep the same 2778 * socket, no need to do anything. I THINK!! 2779 */ 2780 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2781 if (send_int_conf) { 2782 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2783 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2784 } 2785 return (m); 2786 } 2787 oso = (*inp_p)->sctp_socket; 2788 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2789 SCTP_TCB_UNLOCK((*stcb)); 2790 CURVNET_SET(oso->so_vnet); 2791 so = sonewconn(oso, 0 2792 ); 2793 CURVNET_RESTORE(); 2794 SCTP_TCB_LOCK((*stcb)); 2795 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2796 2797 if (so == NULL) { 2798 struct mbuf *op_err; 2799 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2800 struct socket *pcb_so; 2801 #endif 2802 /* Too many sockets */ 2803 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n"); 2804 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2805 sctp_abort_association(*inp_p, NULL, m, iphlen, 2806 src, dst, sh, op_err, 2807 mflowtype, mflowid, 2808 vrf_id, port); 2809 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2810 pcb_so = SCTP_INP_SO(*inp_p); 2811 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2812 SCTP_TCB_UNLOCK((*stcb)); 2813 SCTP_SOCKET_LOCK(pcb_so, 1); 2814 SCTP_TCB_LOCK((*stcb)); 2815 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2816 #endif 2817 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, 2818 SCTP_FROM_SCTP_INPUT + SCTP_LOC_23); 2819 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2820 SCTP_SOCKET_UNLOCK(pcb_so, 1); 2821 #endif 2822 return (NULL); 2823 } 2824 inp = (struct sctp_inpcb *)so->so_pcb; 2825 SCTP_INP_INCR_REF(inp); 2826 /* 2827 * We add the unbound flag here so that if we get an 2828 * soabort() before we get the move_pcb done, we 2829 * will properly cleanup. 2830 */ 2831 inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE | 2832 SCTP_PCB_FLAGS_CONNECTED | 2833 SCTP_PCB_FLAGS_IN_TCPPOOL | 2834 SCTP_PCB_FLAGS_UNBOUND | 2835 (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) | 2836 SCTP_PCB_FLAGS_DONT_WAKE); 2837 inp->sctp_features = (*inp_p)->sctp_features; 2838 inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features; 2839 inp->sctp_socket = so; 2840 inp->sctp_frag_point = (*inp_p)->sctp_frag_point; 2841 inp->max_cwnd = (*inp_p)->max_cwnd; 2842 inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off; 2843 inp->ecn_supported = (*inp_p)->ecn_supported; 2844 inp->prsctp_supported = (*inp_p)->prsctp_supported; 2845 inp->auth_supported = (*inp_p)->auth_supported; 2846 inp->asconf_supported = (*inp_p)->asconf_supported; 2847 inp->reconfig_supported = (*inp_p)->reconfig_supported; 2848 inp->nrsack_supported = (*inp_p)->nrsack_supported; 2849 inp->pktdrop_supported = (*inp_p)->pktdrop_supported; 2850 inp->partial_delivery_point = (*inp_p)->partial_delivery_point; 2851 inp->sctp_context = (*inp_p)->sctp_context; 2852 inp->local_strreset_support = (*inp_p)->local_strreset_support; 2853 inp->fibnum = (*inp_p)->fibnum; 2854 inp->inp_starting_point_for_iterator = NULL; 2855 /* 2856 * copy in the authentication parameters from the 2857 * original endpoint 2858 */ 2859 if (inp->sctp_ep.local_hmacs) 2860 sctp_free_hmaclist(inp->sctp_ep.local_hmacs); 2861 inp->sctp_ep.local_hmacs = 2862 sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs); 2863 if (inp->sctp_ep.local_auth_chunks) 2864 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks); 2865 inp->sctp_ep.local_auth_chunks = 2866 sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks); 2867 2868 /* 2869 * Now we must move it from one hash table to 2870 * another and get the tcb in the right place. 2871 */ 2872 2873 /* 2874 * This is where the one-2-one socket is put into 2875 * the accept state waiting for the accept! 2876 */ 2877 if (*stcb) { 2878 (*stcb)->asoc.state |= SCTP_STATE_IN_ACCEPT_QUEUE; 2879 } 2880 sctp_move_pcb_and_assoc(*inp_p, inp, *stcb); 2881 2882 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2883 SCTP_TCB_UNLOCK((*stcb)); 2884 2885 sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb, 2886 0); 2887 SCTP_TCB_LOCK((*stcb)); 2888 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2889 2890 2891 /* 2892 * now we must check to see if we were aborted while 2893 * the move was going on and the lock/unlock 2894 * happened. 2895 */ 2896 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 2897 /* 2898 * yep it was, we leave the assoc attached 2899 * to the socket since the sctp_inpcb_free() 2900 * call will send an abort for us. 2901 */ 2902 SCTP_INP_DECR_REF(inp); 2903 return (NULL); 2904 } 2905 SCTP_INP_DECR_REF(inp); 2906 /* Switch over to the new guy */ 2907 *inp_p = inp; 2908 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2909 if (send_int_conf) { 2910 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2911 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2912 } 2913 /* 2914 * Pull it from the incomplete queue and wake the 2915 * guy 2916 */ 2917 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2918 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2919 SCTP_TCB_UNLOCK((*stcb)); 2920 SCTP_SOCKET_LOCK(so, 1); 2921 #endif 2922 soisconnected(so); 2923 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2924 SCTP_TCB_LOCK((*stcb)); 2925 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2926 SCTP_SOCKET_UNLOCK(so, 1); 2927 #endif 2928 return (m); 2929 } 2930 } 2931 if (notification) { 2932 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2933 } 2934 if (send_int_conf) { 2935 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2936 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2937 } 2938 return (m); 2939 } 2940 2941 static void 2942 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED, 2943 struct sctp_tcb *stcb, struct sctp_nets *net) 2944 { 2945 /* cp must not be used, others call this without a c-ack :-) */ 2946 struct sctp_association *asoc; 2947 2948 SCTPDBG(SCTP_DEBUG_INPUT2, 2949 "sctp_handle_cookie_ack: handling COOKIE-ACK\n"); 2950 if ((stcb == NULL) || (net == NULL)) { 2951 return; 2952 } 2953 asoc = &stcb->asoc; 2954 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 2955 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 2956 asoc->overall_error_count, 2957 0, 2958 SCTP_FROM_SCTP_INPUT, 2959 __LINE__); 2960 } 2961 asoc->overall_error_count = 0; 2962 sctp_stop_all_cookie_timers(stcb); 2963 /* process according to association state */ 2964 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) { 2965 /* state change only needed when I am in right state */ 2966 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2967 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 2968 sctp_start_net_timers(stcb); 2969 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2970 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2971 stcb->sctp_ep, stcb, asoc->primary_destination); 2972 2973 } 2974 /* update RTO */ 2975 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 2976 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2977 if (asoc->overall_error_count == 0) { 2978 net->RTO = sctp_calculate_rto(stcb, asoc, net, 2979 &asoc->time_entered, 2980 SCTP_RTT_FROM_NON_DATA); 2981 } 2982 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 2983 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2984 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2985 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 2986 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2987 struct socket *so; 2988 2989 #endif 2990 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2991 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2992 so = SCTP_INP_SO(stcb->sctp_ep); 2993 atomic_add_int(&stcb->asoc.refcnt, 1); 2994 SCTP_TCB_UNLOCK(stcb); 2995 SCTP_SOCKET_LOCK(so, 1); 2996 SCTP_TCB_LOCK(stcb); 2997 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2998 #endif 2999 if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) { 3000 soisconnected(stcb->sctp_socket); 3001 } 3002 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3003 SCTP_SOCKET_UNLOCK(so, 1); 3004 #endif 3005 } 3006 /* 3007 * since we did not send a HB make sure we don't double 3008 * things 3009 */ 3010 net->hb_responded = 1; 3011 3012 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 3013 /* 3014 * We don't need to do the asconf thing, nor hb or 3015 * autoclose if the socket is closed. 3016 */ 3017 goto closed_socket; 3018 } 3019 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 3020 stcb, net); 3021 3022 3023 if (stcb->asoc.sctp_autoclose_ticks && 3024 sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) { 3025 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 3026 stcb->sctp_ep, stcb, NULL); 3027 } 3028 /* 3029 * send ASCONF if parameters are pending and ASCONFs are 3030 * allowed (eg. addresses changed when init/cookie echo were 3031 * in flight) 3032 */ 3033 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) && 3034 (stcb->asoc.asconf_supported == 1) && 3035 (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) { 3036 #ifdef SCTP_TIMER_BASED_ASCONF 3037 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, 3038 stcb->sctp_ep, stcb, 3039 stcb->asoc.primary_destination); 3040 #else 3041 sctp_send_asconf(stcb, stcb->asoc.primary_destination, 3042 SCTP_ADDR_NOT_LOCKED); 3043 #endif 3044 } 3045 } 3046 closed_socket: 3047 /* Toss the cookie if I can */ 3048 sctp_toss_old_cookies(stcb, asoc); 3049 if (!TAILQ_EMPTY(&asoc->sent_queue)) { 3050 /* Restart the timer if we have pending data */ 3051 struct sctp_tmit_chunk *chk; 3052 3053 chk = TAILQ_FIRST(&asoc->sent_queue); 3054 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 3055 } 3056 } 3057 3058 static void 3059 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp, 3060 struct sctp_tcb *stcb) 3061 { 3062 struct sctp_nets *net; 3063 struct sctp_tmit_chunk *lchk; 3064 struct sctp_ecne_chunk bkup; 3065 uint8_t override_bit; 3066 uint32_t tsn, window_data_tsn; 3067 int len; 3068 unsigned int pkt_cnt; 3069 3070 len = ntohs(cp->ch.chunk_length); 3071 if ((len != sizeof(struct sctp_ecne_chunk)) && 3072 (len != sizeof(struct old_sctp_ecne_chunk))) { 3073 return; 3074 } 3075 if (len == sizeof(struct old_sctp_ecne_chunk)) { 3076 /* Its the old format */ 3077 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk)); 3078 bkup.num_pkts_since_cwr = htonl(1); 3079 cp = &bkup; 3080 } 3081 SCTP_STAT_INCR(sctps_recvecne); 3082 tsn = ntohl(cp->tsn); 3083 pkt_cnt = ntohl(cp->num_pkts_since_cwr); 3084 lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead); 3085 if (lchk == NULL) { 3086 window_data_tsn = stcb->asoc.sending_seq - 1; 3087 } else { 3088 window_data_tsn = lchk->rec.data.tsn; 3089 } 3090 3091 /* Find where it was sent to if possible. */ 3092 net = NULL; 3093 TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) { 3094 if (lchk->rec.data.tsn == tsn) { 3095 net = lchk->whoTo; 3096 net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send; 3097 break; 3098 } 3099 if (SCTP_TSN_GT(lchk->rec.data.tsn, tsn)) { 3100 break; 3101 } 3102 } 3103 if (net == NULL) { 3104 /* 3105 * What to do. A previous send of a CWR was possibly lost. 3106 * See how old it is, we may have it marked on the actual 3107 * net. 3108 */ 3109 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 3110 if (tsn == net->last_cwr_tsn) { 3111 /* Found him, send it off */ 3112 break; 3113 } 3114 } 3115 if (net == NULL) { 3116 /* 3117 * If we reach here, we need to send a special CWR 3118 * that says hey, we did this a long time ago and 3119 * you lost the response. 3120 */ 3121 net = TAILQ_FIRST(&stcb->asoc.nets); 3122 if (net == NULL) { 3123 /* TSNH */ 3124 return; 3125 } 3126 override_bit = SCTP_CWR_REDUCE_OVERRIDE; 3127 } else { 3128 override_bit = 0; 3129 } 3130 } else { 3131 override_bit = 0; 3132 } 3133 if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) && 3134 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 3135 /* 3136 * JRS - Use the congestion control given in the pluggable 3137 * CC module 3138 */ 3139 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt); 3140 /* 3141 * We reduce once every RTT. So we will only lower cwnd at 3142 * the next sending seq i.e. the window_data_tsn 3143 */ 3144 net->cwr_window_tsn = window_data_tsn; 3145 net->ecn_ce_pkt_cnt += pkt_cnt; 3146 net->lost_cnt = pkt_cnt; 3147 net->last_cwr_tsn = tsn; 3148 } else { 3149 override_bit |= SCTP_CWR_IN_SAME_WINDOW; 3150 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) && 3151 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 3152 /* 3153 * Another loss in the same window update how many 3154 * marks/packets lost we have had. 3155 */ 3156 int cnt = 1; 3157 3158 if (pkt_cnt > net->lost_cnt) { 3159 /* Should be the case */ 3160 cnt = (pkt_cnt - net->lost_cnt); 3161 net->ecn_ce_pkt_cnt += cnt; 3162 } 3163 net->lost_cnt = pkt_cnt; 3164 net->last_cwr_tsn = tsn; 3165 /* 3166 * Most CC functions will ignore this call, since we 3167 * are in-window yet of the initial CE the peer saw. 3168 */ 3169 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt); 3170 } 3171 } 3172 /* 3173 * We always send a CWR this way if our previous one was lost our 3174 * peer will get an update, or if it is not time again to reduce we 3175 * still get the cwr to the peer. Note we set the override when we 3176 * could not find the TSN on the chunk or the destination network. 3177 */ 3178 sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit); 3179 } 3180 3181 static void 3182 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net) 3183 { 3184 /* 3185 * Here we get a CWR from the peer. We must look in the outqueue and 3186 * make sure that we have a covered ECNE in the control chunk part. 3187 * If so remove it. 3188 */ 3189 struct sctp_tmit_chunk *chk, *nchk; 3190 struct sctp_ecne_chunk *ecne; 3191 int override; 3192 uint32_t cwr_tsn; 3193 3194 cwr_tsn = ntohl(cp->tsn); 3195 override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE; 3196 TAILQ_FOREACH_SAFE(chk, &stcb->asoc.control_send_queue, sctp_next, nchk) { 3197 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) { 3198 continue; 3199 } 3200 if ((override == 0) && (chk->whoTo != net)) { 3201 /* Must be from the right src unless override is set */ 3202 continue; 3203 } 3204 ecne = mtod(chk->data, struct sctp_ecne_chunk *); 3205 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) { 3206 /* this covers this ECNE, we can remove it */ 3207 stcb->asoc.ecn_echo_cnt_onq--; 3208 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, 3209 sctp_next); 3210 sctp_m_freem(chk->data); 3211 chk->data = NULL; 3212 stcb->asoc.ctrl_queue_cnt--; 3213 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3214 if (override == 0) { 3215 break; 3216 } 3217 } 3218 } 3219 } 3220 3221 static void 3222 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED, 3223 struct sctp_tcb *stcb, struct sctp_nets *net) 3224 { 3225 struct sctp_association *asoc; 3226 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3227 struct socket *so; 3228 #endif 3229 3230 SCTPDBG(SCTP_DEBUG_INPUT2, 3231 "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n"); 3232 if (stcb == NULL) 3233 return; 3234 3235 asoc = &stcb->asoc; 3236 /* process according to association state */ 3237 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 3238 /* unexpected SHUTDOWN-COMPLETE... so ignore... */ 3239 SCTPDBG(SCTP_DEBUG_INPUT2, 3240 "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n"); 3241 SCTP_TCB_UNLOCK(stcb); 3242 return; 3243 } 3244 /* notify upper layer protocol */ 3245 if (stcb->sctp_socket) { 3246 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 3247 } 3248 #ifdef INVARIANTS 3249 if (!TAILQ_EMPTY(&asoc->send_queue) || 3250 !TAILQ_EMPTY(&asoc->sent_queue) || 3251 sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) { 3252 panic("Queues are not empty when handling SHUTDOWN-COMPLETE"); 3253 } 3254 #endif 3255 /* stop the timer */ 3256 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, 3257 SCTP_FROM_SCTP_INPUT + SCTP_LOC_24); 3258 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 3259 /* free the TCB */ 3260 SCTPDBG(SCTP_DEBUG_INPUT2, 3261 "sctp_handle_shutdown_complete: calls free-asoc\n"); 3262 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3263 so = SCTP_INP_SO(stcb->sctp_ep); 3264 atomic_add_int(&stcb->asoc.refcnt, 1); 3265 SCTP_TCB_UNLOCK(stcb); 3266 SCTP_SOCKET_LOCK(so, 1); 3267 SCTP_TCB_LOCK(stcb); 3268 atomic_subtract_int(&stcb->asoc.refcnt, 1); 3269 #endif 3270 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 3271 SCTP_FROM_SCTP_INPUT + SCTP_LOC_25); 3272 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3273 SCTP_SOCKET_UNLOCK(so, 1); 3274 #endif 3275 return; 3276 } 3277 3278 static int 3279 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc, 3280 struct sctp_nets *net, uint8_t flg) 3281 { 3282 switch (desc->chunk_type) { 3283 case SCTP_DATA: 3284 /* find the tsn to resend (possibly */ 3285 { 3286 uint32_t tsn; 3287 struct sctp_tmit_chunk *tp1; 3288 3289 tsn = ntohl(desc->tsn_ifany); 3290 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3291 if (tp1->rec.data.tsn == tsn) { 3292 /* found it */ 3293 break; 3294 } 3295 if (SCTP_TSN_GT(tp1->rec.data.tsn, tsn)) { 3296 /* not found */ 3297 tp1 = NULL; 3298 break; 3299 } 3300 } 3301 if (tp1 == NULL) { 3302 /* 3303 * Do it the other way , aka without paying 3304 * attention to queue seq order. 3305 */ 3306 SCTP_STAT_INCR(sctps_pdrpdnfnd); 3307 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3308 if (tp1->rec.data.tsn == tsn) { 3309 /* found it */ 3310 break; 3311 } 3312 } 3313 } 3314 if (tp1 == NULL) { 3315 SCTP_STAT_INCR(sctps_pdrptsnnf); 3316 } 3317 if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) { 3318 uint8_t *ddp; 3319 3320 if (((flg & SCTP_BADCRC) == 0) && 3321 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3322 return (0); 3323 } 3324 if ((stcb->asoc.peers_rwnd == 0) && 3325 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3326 SCTP_STAT_INCR(sctps_pdrpdiwnp); 3327 return (0); 3328 } 3329 if (stcb->asoc.peers_rwnd == 0 && 3330 (flg & SCTP_FROM_MIDDLE_BOX)) { 3331 SCTP_STAT_INCR(sctps_pdrpdizrw); 3332 return (0); 3333 } 3334 ddp = (uint8_t *)(mtod(tp1->data, caddr_t)+ 3335 sizeof(struct sctp_data_chunk)); 3336 { 3337 unsigned int iii; 3338 3339 for (iii = 0; iii < sizeof(desc->data_bytes); 3340 iii++) { 3341 if (ddp[iii] != desc->data_bytes[iii]) { 3342 SCTP_STAT_INCR(sctps_pdrpbadd); 3343 return (-1); 3344 } 3345 } 3346 } 3347 3348 if (tp1->do_rtt) { 3349 /* 3350 * this guy had a RTO calculation 3351 * pending on it, cancel it 3352 */ 3353 if (tp1->whoTo->rto_needed == 0) { 3354 tp1->whoTo->rto_needed = 1; 3355 } 3356 tp1->do_rtt = 0; 3357 } 3358 SCTP_STAT_INCR(sctps_pdrpmark); 3359 if (tp1->sent != SCTP_DATAGRAM_RESEND) 3360 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3361 /* 3362 * mark it as if we were doing a FR, since 3363 * we will be getting gap ack reports behind 3364 * the info from the router. 3365 */ 3366 tp1->rec.data.doing_fast_retransmit = 1; 3367 /* 3368 * mark the tsn with what sequences can 3369 * cause a new FR. 3370 */ 3371 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) { 3372 tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq; 3373 } else { 3374 tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.tsn; 3375 } 3376 3377 /* restart the timer */ 3378 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3379 stcb, tp1->whoTo, 3380 SCTP_FROM_SCTP_INPUT + SCTP_LOC_26); 3381 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3382 stcb, tp1->whoTo); 3383 3384 /* fix counts and things */ 3385 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 3386 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP, 3387 tp1->whoTo->flight_size, 3388 tp1->book_size, 3389 (uint32_t)(uintptr_t)stcb, 3390 tp1->rec.data.tsn); 3391 } 3392 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3393 sctp_flight_size_decrease(tp1); 3394 sctp_total_flight_decrease(stcb, tp1); 3395 } 3396 tp1->sent = SCTP_DATAGRAM_RESEND; 3397 } { 3398 /* audit code */ 3399 unsigned int audit; 3400 3401 audit = 0; 3402 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3403 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3404 audit++; 3405 } 3406 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue, 3407 sctp_next) { 3408 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3409 audit++; 3410 } 3411 if (audit != stcb->asoc.sent_queue_retran_cnt) { 3412 SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n", 3413 audit, stcb->asoc.sent_queue_retran_cnt); 3414 #ifndef SCTP_AUDITING_ENABLED 3415 stcb->asoc.sent_queue_retran_cnt = audit; 3416 #endif 3417 } 3418 } 3419 } 3420 break; 3421 case SCTP_ASCONF: 3422 { 3423 struct sctp_tmit_chunk *asconf; 3424 3425 TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue, 3426 sctp_next) { 3427 if (asconf->rec.chunk_id.id == SCTP_ASCONF) { 3428 break; 3429 } 3430 } 3431 if (asconf) { 3432 if (asconf->sent != SCTP_DATAGRAM_RESEND) 3433 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3434 asconf->sent = SCTP_DATAGRAM_RESEND; 3435 asconf->snd_count--; 3436 } 3437 } 3438 break; 3439 case SCTP_INITIATION: 3440 /* resend the INIT */ 3441 stcb->asoc.dropped_special_cnt++; 3442 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) { 3443 /* 3444 * If we can get it in, in a few attempts we do 3445 * this, otherwise we let the timer fire. 3446 */ 3447 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, 3448 stcb, net, 3449 SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 3450 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 3451 } 3452 break; 3453 case SCTP_SELECTIVE_ACK: 3454 case SCTP_NR_SELECTIVE_ACK: 3455 /* resend the sack */ 3456 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED); 3457 break; 3458 case SCTP_HEARTBEAT_REQUEST: 3459 /* resend a demand HB */ 3460 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) { 3461 /* 3462 * Only retransmit if we KNOW we wont destroy the 3463 * tcb 3464 */ 3465 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 3466 } 3467 break; 3468 case SCTP_SHUTDOWN: 3469 sctp_send_shutdown(stcb, net); 3470 break; 3471 case SCTP_SHUTDOWN_ACK: 3472 sctp_send_shutdown_ack(stcb, net); 3473 break; 3474 case SCTP_COOKIE_ECHO: 3475 { 3476 struct sctp_tmit_chunk *cookie; 3477 3478 cookie = NULL; 3479 TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, 3480 sctp_next) { 3481 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) { 3482 break; 3483 } 3484 } 3485 if (cookie) { 3486 if (cookie->sent != SCTP_DATAGRAM_RESEND) 3487 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3488 cookie->sent = SCTP_DATAGRAM_RESEND; 3489 sctp_stop_all_cookie_timers(stcb); 3490 } 3491 } 3492 break; 3493 case SCTP_COOKIE_ACK: 3494 sctp_send_cookie_ack(stcb); 3495 break; 3496 case SCTP_ASCONF_ACK: 3497 /* resend last asconf ack */ 3498 sctp_send_asconf_ack(stcb); 3499 break; 3500 case SCTP_IFORWARD_CUM_TSN: 3501 case SCTP_FORWARD_CUM_TSN: 3502 send_forward_tsn(stcb, &stcb->asoc); 3503 break; 3504 /* can't do anything with these */ 3505 case SCTP_PACKET_DROPPED: 3506 case SCTP_INITIATION_ACK: /* this should not happen */ 3507 case SCTP_HEARTBEAT_ACK: 3508 case SCTP_ABORT_ASSOCIATION: 3509 case SCTP_OPERATION_ERROR: 3510 case SCTP_SHUTDOWN_COMPLETE: 3511 case SCTP_ECN_ECHO: 3512 case SCTP_ECN_CWR: 3513 default: 3514 break; 3515 } 3516 return (0); 3517 } 3518 3519 void 3520 sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list) 3521 { 3522 uint32_t i; 3523 uint16_t temp; 3524 3525 /* 3526 * We set things to 0xffffffff since this is the last delivered 3527 * sequence and we will be sending in 0 after the reset. 3528 */ 3529 3530 if (number_entries) { 3531 for (i = 0; i < number_entries; i++) { 3532 temp = ntohs(list[i]); 3533 if (temp >= stcb->asoc.streamincnt) { 3534 continue; 3535 } 3536 stcb->asoc.strmin[temp].last_mid_delivered = 0xffffffff; 3537 } 3538 } else { 3539 list = NULL; 3540 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3541 stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff; 3542 } 3543 } 3544 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3545 } 3546 3547 static void 3548 sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list) 3549 { 3550 uint32_t i; 3551 uint16_t temp; 3552 3553 if (number_entries > 0) { 3554 for (i = 0; i < number_entries; i++) { 3555 temp = ntohs(list[i]); 3556 if (temp >= stcb->asoc.streamoutcnt) { 3557 /* no such stream */ 3558 continue; 3559 } 3560 stcb->asoc.strmout[temp].next_mid_ordered = 0; 3561 stcb->asoc.strmout[temp].next_mid_unordered = 0; 3562 } 3563 } else { 3564 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3565 stcb->asoc.strmout[i].next_mid_ordered = 0; 3566 stcb->asoc.strmout[i].next_mid_unordered = 0; 3567 } 3568 } 3569 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3570 } 3571 3572 static void 3573 sctp_reset_clear_pending(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list) 3574 { 3575 uint32_t i; 3576 uint16_t temp; 3577 3578 if (number_entries > 0) { 3579 for (i = 0; i < number_entries; i++) { 3580 temp = ntohs(list[i]); 3581 if (temp >= stcb->asoc.streamoutcnt) { 3582 /* no such stream */ 3583 continue; 3584 } 3585 stcb->asoc.strmout[temp].state = SCTP_STREAM_OPEN; 3586 } 3587 } else { 3588 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3589 stcb->asoc.strmout[i].state = SCTP_STREAM_OPEN; 3590 } 3591 } 3592 } 3593 3594 3595 struct sctp_stream_reset_request * 3596 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk) 3597 { 3598 struct sctp_association *asoc; 3599 struct sctp_chunkhdr *ch; 3600 struct sctp_stream_reset_request *r; 3601 struct sctp_tmit_chunk *chk; 3602 int len, clen; 3603 3604 asoc = &stcb->asoc; 3605 if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 3606 asoc->stream_reset_outstanding = 0; 3607 return (NULL); 3608 } 3609 if (stcb->asoc.str_reset == NULL) { 3610 asoc->stream_reset_outstanding = 0; 3611 return (NULL); 3612 } 3613 chk = stcb->asoc.str_reset; 3614 if (chk->data == NULL) { 3615 return (NULL); 3616 } 3617 if (bchk) { 3618 /* he wants a copy of the chk pointer */ 3619 *bchk = chk; 3620 } 3621 clen = chk->send_size; 3622 ch = mtod(chk->data, struct sctp_chunkhdr *); 3623 r = (struct sctp_stream_reset_request *)(ch + 1); 3624 if (ntohl(r->request_seq) == seq) { 3625 /* found it */ 3626 return (r); 3627 } 3628 len = SCTP_SIZE32(ntohs(r->ph.param_length)); 3629 if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) { 3630 /* move to the next one, there can only be a max of two */ 3631 r = (struct sctp_stream_reset_request *)((caddr_t)r + len); 3632 if (ntohl(r->request_seq) == seq) { 3633 return (r); 3634 } 3635 } 3636 /* that seq is not here */ 3637 return (NULL); 3638 } 3639 3640 static void 3641 sctp_clean_up_stream_reset(struct sctp_tcb *stcb) 3642 { 3643 struct sctp_association *asoc; 3644 struct sctp_tmit_chunk *chk = stcb->asoc.str_reset; 3645 3646 if (stcb->asoc.str_reset == NULL) { 3647 return; 3648 } 3649 asoc = &stcb->asoc; 3650 3651 sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, 3652 chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_28); 3653 TAILQ_REMOVE(&asoc->control_send_queue, 3654 chk, 3655 sctp_next); 3656 if (chk->data) { 3657 sctp_m_freem(chk->data); 3658 chk->data = NULL; 3659 } 3660 asoc->ctrl_queue_cnt--; 3661 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3662 /* sa_ignore NO_NULL_CHK */ 3663 stcb->asoc.str_reset = NULL; 3664 } 3665 3666 3667 static int 3668 sctp_handle_stream_reset_response(struct sctp_tcb *stcb, 3669 uint32_t seq, uint32_t action, 3670 struct sctp_stream_reset_response *respin) 3671 { 3672 uint16_t type; 3673 int lparam_len; 3674 struct sctp_association *asoc = &stcb->asoc; 3675 struct sctp_tmit_chunk *chk; 3676 struct sctp_stream_reset_request *req_param; 3677 struct sctp_stream_reset_out_request *req_out_param; 3678 struct sctp_stream_reset_in_request *req_in_param; 3679 uint32_t number_entries; 3680 3681 if (asoc->stream_reset_outstanding == 0) { 3682 /* duplicate */ 3683 return (0); 3684 } 3685 if (seq == stcb->asoc.str_reset_seq_out) { 3686 req_param = sctp_find_stream_reset(stcb, seq, &chk); 3687 if (req_param != NULL) { 3688 stcb->asoc.str_reset_seq_out++; 3689 type = ntohs(req_param->ph.param_type); 3690 lparam_len = ntohs(req_param->ph.param_length); 3691 if (type == SCTP_STR_RESET_OUT_REQUEST) { 3692 int no_clear = 0; 3693 3694 req_out_param = (struct sctp_stream_reset_out_request *)req_param; 3695 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t); 3696 asoc->stream_reset_out_is_outstanding = 0; 3697 if (asoc->stream_reset_outstanding) 3698 asoc->stream_reset_outstanding--; 3699 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3700 /* do it */ 3701 sctp_reset_out_streams(stcb, number_entries, req_out_param->list_of_streams); 3702 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3703 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3704 } else if (action == SCTP_STREAM_RESET_RESULT_IN_PROGRESS) { 3705 /* 3706 * Set it up so we don't stop 3707 * retransmitting 3708 */ 3709 asoc->stream_reset_outstanding++; 3710 stcb->asoc.str_reset_seq_out--; 3711 asoc->stream_reset_out_is_outstanding = 1; 3712 no_clear = 1; 3713 } else { 3714 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3715 } 3716 if (no_clear == 0) { 3717 sctp_reset_clear_pending(stcb, number_entries, req_out_param->list_of_streams); 3718 } 3719 } else if (type == SCTP_STR_RESET_IN_REQUEST) { 3720 req_in_param = (struct sctp_stream_reset_in_request *)req_param; 3721 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t); 3722 if (asoc->stream_reset_outstanding) 3723 asoc->stream_reset_outstanding--; 3724 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3725 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb, 3726 number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3727 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3728 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb, 3729 number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3730 } 3731 } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) { 3732 /* Ok we now may have more streams */ 3733 int num_stream; 3734 3735 num_stream = stcb->asoc.strm_pending_add_size; 3736 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) { 3737 /* TSNH */ 3738 num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt; 3739 } 3740 stcb->asoc.strm_pending_add_size = 0; 3741 if (asoc->stream_reset_outstanding) 3742 asoc->stream_reset_outstanding--; 3743 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3744 /* Put the new streams into effect */ 3745 int i; 3746 3747 for (i = asoc->streamoutcnt; i < (asoc->streamoutcnt + num_stream); i++) { 3748 asoc->strmout[i].state = SCTP_STREAM_OPEN; 3749 } 3750 asoc->streamoutcnt += num_stream; 3751 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 3752 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3753 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3754 SCTP_STREAM_CHANGE_DENIED); 3755 } else { 3756 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3757 SCTP_STREAM_CHANGE_FAILED); 3758 } 3759 } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) { 3760 if (asoc->stream_reset_outstanding) 3761 asoc->stream_reset_outstanding--; 3762 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3763 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3764 SCTP_STREAM_CHANGE_DENIED); 3765 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3766 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3767 SCTP_STREAM_CHANGE_FAILED); 3768 } 3769 } else if (type == SCTP_STR_RESET_TSN_REQUEST) { 3770 /** 3771 * a) Adopt the new in tsn. 3772 * b) reset the map 3773 * c) Adopt the new out-tsn 3774 */ 3775 struct sctp_stream_reset_response_tsn *resp; 3776 struct sctp_forward_tsn_chunk fwdtsn; 3777 int abort_flag = 0; 3778 3779 if (respin == NULL) { 3780 /* huh ? */ 3781 return (0); 3782 } 3783 if (ntohs(respin->ph.param_length) < sizeof(struct sctp_stream_reset_response_tsn)) { 3784 return (0); 3785 } 3786 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3787 resp = (struct sctp_stream_reset_response_tsn *)respin; 3788 asoc->stream_reset_outstanding--; 3789 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3790 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3791 fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1); 3792 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3793 if (abort_flag) { 3794 return (1); 3795 } 3796 stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1); 3797 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3798 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3799 } 3800 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 3801 stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn); 3802 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 3803 3804 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map; 3805 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size); 3806 3807 stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn); 3808 stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn; 3809 3810 sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL); 3811 sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL); 3812 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0); 3813 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3814 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3815 SCTP_ASSOC_RESET_DENIED); 3816 } else { 3817 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3818 SCTP_ASSOC_RESET_FAILED); 3819 } 3820 } 3821 /* get rid of the request and get the request flags */ 3822 if (asoc->stream_reset_outstanding == 0) { 3823 sctp_clean_up_stream_reset(stcb); 3824 } 3825 } 3826 } 3827 if (asoc->stream_reset_outstanding == 0) { 3828 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED); 3829 } 3830 return (0); 3831 } 3832 3833 static void 3834 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb, 3835 struct sctp_tmit_chunk *chk, 3836 struct sctp_stream_reset_in_request *req, int trunc) 3837 { 3838 uint32_t seq; 3839 int len, i; 3840 int number_entries; 3841 uint16_t temp; 3842 3843 /* 3844 * peer wants me to send a str-reset to him for my outgoing seq's if 3845 * seq_in is right. 3846 */ 3847 struct sctp_association *asoc = &stcb->asoc; 3848 3849 seq = ntohl(req->request_seq); 3850 if (asoc->str_reset_seq_in == seq) { 3851 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3852 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3853 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3854 } else if (trunc) { 3855 /* Can't do it, since they exceeded our buffer size */ 3856 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3857 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) { 3858 len = ntohs(req->ph.param_length); 3859 number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t)); 3860 if (number_entries) { 3861 for (i = 0; i < number_entries; i++) { 3862 temp = ntohs(req->list_of_streams[i]); 3863 if (temp >= stcb->asoc.streamoutcnt) { 3864 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3865 goto bad_boy; 3866 } 3867 req->list_of_streams[i] = temp; 3868 } 3869 for (i = 0; i < number_entries; i++) { 3870 if (stcb->asoc.strmout[req->list_of_streams[i]].state == SCTP_STREAM_OPEN) { 3871 stcb->asoc.strmout[req->list_of_streams[i]].state = SCTP_STREAM_RESET_PENDING; 3872 } 3873 } 3874 } else { 3875 /* Its all */ 3876 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3877 if (stcb->asoc.strmout[i].state == SCTP_STREAM_OPEN) 3878 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_PENDING; 3879 } 3880 } 3881 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3882 } else { 3883 /* Can't do it, since we have sent one out */ 3884 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 3885 } 3886 bad_boy: 3887 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3888 asoc->str_reset_seq_in++; 3889 } else if (asoc->str_reset_seq_in - 1 == seq) { 3890 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3891 } else if (asoc->str_reset_seq_in - 2 == seq) { 3892 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3893 } else { 3894 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3895 } 3896 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED); 3897 } 3898 3899 static int 3900 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb, 3901 struct sctp_tmit_chunk *chk, 3902 struct sctp_stream_reset_tsn_request *req) 3903 { 3904 /* reset all in and out and update the tsn */ 3905 /* 3906 * A) reset my str-seq's on in and out. B) Select a receive next, 3907 * and set cum-ack to it. Also process this selected number as a 3908 * fwd-tsn as well. C) set in the response my next sending seq. 3909 */ 3910 struct sctp_forward_tsn_chunk fwdtsn; 3911 struct sctp_association *asoc = &stcb->asoc; 3912 int abort_flag = 0; 3913 uint32_t seq; 3914 3915 seq = ntohl(req->request_seq); 3916 if (asoc->str_reset_seq_in == seq) { 3917 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3918 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 3919 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3920 } else { 3921 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3922 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3923 fwdtsn.ch.chunk_flags = 0; 3924 fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1); 3925 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3926 if (abort_flag) { 3927 return (1); 3928 } 3929 asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA; 3930 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3931 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3932 } 3933 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map; 3934 asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1; 3935 memset(asoc->mapping_array, 0, asoc->mapping_array_size); 3936 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 3937 memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size); 3938 atomic_add_int(&asoc->sending_seq, 1); 3939 /* save off historical data for retrans */ 3940 asoc->last_sending_seq[1] = asoc->last_sending_seq[0]; 3941 asoc->last_sending_seq[0] = asoc->sending_seq; 3942 asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0]; 3943 asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn; 3944 sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL); 3945 sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL); 3946 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3947 sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0); 3948 } 3949 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3950 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3951 asoc->str_reset_seq_in++; 3952 } else if (asoc->str_reset_seq_in - 1 == seq) { 3953 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3954 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3955 } else if (asoc->str_reset_seq_in - 2 == seq) { 3956 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1], 3957 asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]); 3958 } else { 3959 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3960 } 3961 return (0); 3962 } 3963 3964 static void 3965 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb, 3966 struct sctp_tmit_chunk *chk, 3967 struct sctp_stream_reset_out_request *req, int trunc) 3968 { 3969 uint32_t seq, tsn; 3970 int number_entries, len; 3971 struct sctp_association *asoc = &stcb->asoc; 3972 3973 seq = ntohl(req->request_seq); 3974 3975 /* now if its not a duplicate we process it */ 3976 if (asoc->str_reset_seq_in == seq) { 3977 len = ntohs(req->ph.param_length); 3978 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t)); 3979 /* 3980 * the sender is resetting, handle the list issue.. we must 3981 * a) verify if we can do the reset, if so no problem b) If 3982 * we can't do the reset we must copy the request. c) queue 3983 * it, and setup the data in processor to trigger it off 3984 * when needed and dequeue all the queued data. 3985 */ 3986 tsn = ntohl(req->send_reset_at_tsn); 3987 3988 /* move the reset action back one */ 3989 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3990 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3991 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3992 } else if (trunc) { 3993 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3994 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) { 3995 /* we can do it now */ 3996 sctp_reset_in_stream(stcb, number_entries, req->list_of_streams); 3997 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3998 } else { 3999 /* 4000 * we must queue it up and thus wait for the TSN's 4001 * to arrive that are at or before tsn 4002 */ 4003 struct sctp_stream_reset_list *liste; 4004 int siz; 4005 4006 siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t)); 4007 SCTP_MALLOC(liste, struct sctp_stream_reset_list *, 4008 siz, SCTP_M_STRESET); 4009 if (liste == NULL) { 4010 /* gak out of memory */ 4011 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4012 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4013 return; 4014 } 4015 liste->seq = seq; 4016 liste->tsn = tsn; 4017 liste->number_entries = number_entries; 4018 memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t)); 4019 TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp); 4020 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_IN_PROGRESS; 4021 } 4022 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4023 asoc->str_reset_seq_in++; 4024 } else if ((asoc->str_reset_seq_in - 1) == seq) { 4025 /* 4026 * one seq back, just echo back last action since my 4027 * response was lost. 4028 */ 4029 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4030 } else if ((asoc->str_reset_seq_in - 2) == seq) { 4031 /* 4032 * two seq back, just echo back last action since my 4033 * response was lost. 4034 */ 4035 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 4036 } else { 4037 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 4038 } 4039 } 4040 4041 static void 4042 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 4043 struct sctp_stream_reset_add_strm *str_add) 4044 { 4045 /* 4046 * Peer is requesting to add more streams. If its within our 4047 * max-streams we will allow it. 4048 */ 4049 uint32_t num_stream, i; 4050 uint32_t seq; 4051 struct sctp_association *asoc = &stcb->asoc; 4052 struct sctp_queued_to_read *ctl, *nctl; 4053 4054 /* Get the number. */ 4055 seq = ntohl(str_add->request_seq); 4056 num_stream = ntohs(str_add->number_of_streams); 4057 /* Now what would be the new total? */ 4058 if (asoc->str_reset_seq_in == seq) { 4059 num_stream += stcb->asoc.streamincnt; 4060 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 4061 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 4062 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4063 } else if ((num_stream > stcb->asoc.max_inbound_streams) || 4064 (num_stream > 0xffff)) { 4065 /* We must reject it they ask for to many */ 4066 denied: 4067 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4068 } else { 4069 /* Ok, we can do that :-) */ 4070 struct sctp_stream_in *oldstrm; 4071 4072 /* save off the old */ 4073 oldstrm = stcb->asoc.strmin; 4074 SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *, 4075 (num_stream * sizeof(struct sctp_stream_in)), 4076 SCTP_M_STRMI); 4077 if (stcb->asoc.strmin == NULL) { 4078 stcb->asoc.strmin = oldstrm; 4079 goto denied; 4080 } 4081 /* copy off the old data */ 4082 for (i = 0; i < stcb->asoc.streamincnt; i++) { 4083 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 4084 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue); 4085 stcb->asoc.strmin[i].sid = i; 4086 stcb->asoc.strmin[i].last_mid_delivered = oldstrm[i].last_mid_delivered; 4087 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started; 4088 stcb->asoc.strmin[i].pd_api_started = oldstrm[i].pd_api_started; 4089 /* now anything on those queues? */ 4090 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next_instrm, nctl) { 4091 TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next_instrm); 4092 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next_instrm); 4093 } 4094 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].uno_inqueue, next_instrm, nctl) { 4095 TAILQ_REMOVE(&oldstrm[i].uno_inqueue, ctl, next_instrm); 4096 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].uno_inqueue, ctl, next_instrm); 4097 } 4098 } 4099 /* Init the new streams */ 4100 for (i = stcb->asoc.streamincnt; i < num_stream; i++) { 4101 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 4102 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue); 4103 stcb->asoc.strmin[i].sid = i; 4104 stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff; 4105 stcb->asoc.strmin[i].pd_api_started = 0; 4106 stcb->asoc.strmin[i].delivery_started = 0; 4107 } 4108 SCTP_FREE(oldstrm, SCTP_M_STRMI); 4109 /* update the size */ 4110 stcb->asoc.streamincnt = num_stream; 4111 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 4112 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 4113 } 4114 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4115 asoc->str_reset_seq_in++; 4116 } else if ((asoc->str_reset_seq_in - 1) == seq) { 4117 /* 4118 * one seq back, just echo back last action since my 4119 * response was lost. 4120 */ 4121 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4122 } else if ((asoc->str_reset_seq_in - 2) == seq) { 4123 /* 4124 * two seq back, just echo back last action since my 4125 * response was lost. 4126 */ 4127 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 4128 } else { 4129 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 4130 4131 } 4132 } 4133 4134 static void 4135 sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 4136 struct sctp_stream_reset_add_strm *str_add) 4137 { 4138 /* 4139 * Peer is requesting to add more streams. If its within our 4140 * max-streams we will allow it. 4141 */ 4142 uint16_t num_stream; 4143 uint32_t seq; 4144 struct sctp_association *asoc = &stcb->asoc; 4145 4146 /* Get the number. */ 4147 seq = ntohl(str_add->request_seq); 4148 num_stream = ntohs(str_add->number_of_streams); 4149 /* Now what would be the new total? */ 4150 if (asoc->str_reset_seq_in == seq) { 4151 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 4152 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 4153 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4154 } else if (stcb->asoc.stream_reset_outstanding) { 4155 /* We must reject it we have something pending */ 4156 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 4157 } else { 4158 /* Ok, we can do that :-) */ 4159 int mychk; 4160 4161 mychk = stcb->asoc.streamoutcnt; 4162 mychk += num_stream; 4163 if (mychk < 0x10000) { 4164 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 4165 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 1, num_stream, 0, 1)) { 4166 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4167 } 4168 } else { 4169 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4170 } 4171 } 4172 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]); 4173 asoc->str_reset_seq_in++; 4174 } else if ((asoc->str_reset_seq_in - 1) == seq) { 4175 /* 4176 * one seq back, just echo back last action since my 4177 * response was lost. 4178 */ 4179 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4180 } else if ((asoc->str_reset_seq_in - 2) == seq) { 4181 /* 4182 * two seq back, just echo back last action since my 4183 * response was lost. 4184 */ 4185 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 4186 } else { 4187 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 4188 } 4189 } 4190 4191 #ifdef __GNUC__ 4192 __attribute__((noinline)) 4193 #endif 4194 static int 4195 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset, 4196 struct sctp_chunkhdr *ch_req) 4197 { 4198 uint16_t remaining_length, param_len, ptype; 4199 struct sctp_paramhdr pstore; 4200 uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE]; 4201 uint32_t seq = 0; 4202 int num_req = 0; 4203 int trunc = 0; 4204 struct sctp_tmit_chunk *chk; 4205 struct sctp_chunkhdr *ch; 4206 struct sctp_paramhdr *ph; 4207 int ret_code = 0; 4208 int num_param = 0; 4209 4210 /* now it may be a reset or a reset-response */ 4211 remaining_length = ntohs(ch_req->chunk_length) - sizeof(struct sctp_chunkhdr); 4212 4213 /* setup for adding the response */ 4214 sctp_alloc_a_chunk(stcb, chk); 4215 if (chk == NULL) { 4216 return (ret_code); 4217 } 4218 chk->copy_by_ref = 0; 4219 chk->rec.chunk_id.id = SCTP_STREAM_RESET; 4220 chk->rec.chunk_id.can_take_data = 0; 4221 chk->flags = 0; 4222 chk->asoc = &stcb->asoc; 4223 chk->no_fr_allowed = 0; 4224 chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr); 4225 chk->book_size_scale = 0; 4226 chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA); 4227 if (chk->data == NULL) { 4228 strres_nochunk: 4229 if (chk->data) { 4230 sctp_m_freem(chk->data); 4231 chk->data = NULL; 4232 } 4233 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 4234 return (ret_code); 4235 } 4236 SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD); 4237 4238 /* setup chunk parameters */ 4239 chk->sent = SCTP_DATAGRAM_UNSENT; 4240 chk->snd_count = 0; 4241 chk->whoTo = NULL; 4242 4243 ch = mtod(chk->data, struct sctp_chunkhdr *); 4244 ch->chunk_type = SCTP_STREAM_RESET; 4245 ch->chunk_flags = 0; 4246 ch->chunk_length = htons(chk->send_size); 4247 SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size); 4248 offset += sizeof(struct sctp_chunkhdr); 4249 while (remaining_length >= sizeof(struct sctp_paramhdr)) { 4250 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *)&pstore); 4251 if (ph == NULL) { 4252 /* TSNH */ 4253 break; 4254 } 4255 param_len = ntohs(ph->param_length); 4256 if ((param_len > remaining_length) || 4257 (param_len < (sizeof(struct sctp_paramhdr) + sizeof(uint32_t)))) { 4258 /* bad parameter length */ 4259 break; 4260 } 4261 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, sizeof(cstore)), 4262 (uint8_t *)&cstore); 4263 if (ph == NULL) { 4264 /* TSNH */ 4265 break; 4266 } 4267 ptype = ntohs(ph->param_type); 4268 num_param++; 4269 if (param_len > sizeof(cstore)) { 4270 trunc = 1; 4271 } else { 4272 trunc = 0; 4273 } 4274 if (num_param > SCTP_MAX_RESET_PARAMS) { 4275 /* hit the max of parameters already sorry.. */ 4276 break; 4277 } 4278 if (ptype == SCTP_STR_RESET_OUT_REQUEST) { 4279 struct sctp_stream_reset_out_request *req_out; 4280 4281 if (param_len < sizeof(struct sctp_stream_reset_out_request)) { 4282 break; 4283 } 4284 req_out = (struct sctp_stream_reset_out_request *)ph; 4285 num_req++; 4286 if (stcb->asoc.stream_reset_outstanding) { 4287 seq = ntohl(req_out->response_seq); 4288 if (seq == stcb->asoc.str_reset_seq_out) { 4289 /* implicit ack */ 4290 (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL); 4291 } 4292 } 4293 sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc); 4294 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) { 4295 struct sctp_stream_reset_add_strm *str_add; 4296 4297 if (param_len < sizeof(struct sctp_stream_reset_add_strm)) { 4298 break; 4299 } 4300 str_add = (struct sctp_stream_reset_add_strm *)ph; 4301 num_req++; 4302 sctp_handle_str_reset_add_strm(stcb, chk, str_add); 4303 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) { 4304 struct sctp_stream_reset_add_strm *str_add; 4305 4306 if (param_len < sizeof(struct sctp_stream_reset_add_strm)) { 4307 break; 4308 } 4309 str_add = (struct sctp_stream_reset_add_strm *)ph; 4310 num_req++; 4311 sctp_handle_str_reset_add_out_strm(stcb, chk, str_add); 4312 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) { 4313 struct sctp_stream_reset_in_request *req_in; 4314 4315 num_req++; 4316 req_in = (struct sctp_stream_reset_in_request *)ph; 4317 sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc); 4318 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) { 4319 struct sctp_stream_reset_tsn_request *req_tsn; 4320 4321 num_req++; 4322 req_tsn = (struct sctp_stream_reset_tsn_request *)ph; 4323 if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) { 4324 ret_code = 1; 4325 goto strres_nochunk; 4326 } 4327 /* no more */ 4328 break; 4329 } else if (ptype == SCTP_STR_RESET_RESPONSE) { 4330 struct sctp_stream_reset_response *resp; 4331 uint32_t result; 4332 4333 if (param_len < sizeof(struct sctp_stream_reset_response)) { 4334 break; 4335 } 4336 resp = (struct sctp_stream_reset_response *)ph; 4337 seq = ntohl(resp->response_seq); 4338 result = ntohl(resp->result); 4339 if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) { 4340 ret_code = 1; 4341 goto strres_nochunk; 4342 } 4343 } else { 4344 break; 4345 } 4346 offset += SCTP_SIZE32(param_len); 4347 if (remaining_length >= SCTP_SIZE32(param_len)) { 4348 remaining_length -= SCTP_SIZE32(param_len); 4349 } else { 4350 remaining_length = 0; 4351 } 4352 } 4353 if (num_req == 0) { 4354 /* we have no response free the stuff */ 4355 goto strres_nochunk; 4356 } 4357 /* ok we have a chunk to link in */ 4358 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, 4359 chk, 4360 sctp_next); 4361 stcb->asoc.ctrl_queue_cnt++; 4362 return (ret_code); 4363 } 4364 4365 /* 4366 * Handle a router or endpoints report of a packet loss, there are two ways 4367 * to handle this, either we get the whole packet and must disect it 4368 * ourselves (possibly with truncation and or corruption) or it is a summary 4369 * from a middle box that did the disectting for us. 4370 */ 4371 static void 4372 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp, 4373 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 4374 { 4375 uint32_t bottle_bw, on_queue; 4376 uint16_t trunc_len; 4377 unsigned int chlen; 4378 unsigned int at; 4379 struct sctp_chunk_desc desc; 4380 struct sctp_chunkhdr *ch; 4381 4382 chlen = ntohs(cp->ch.chunk_length); 4383 chlen -= sizeof(struct sctp_pktdrop_chunk); 4384 /* XXX possible chlen underflow */ 4385 if (chlen == 0) { 4386 ch = NULL; 4387 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) 4388 SCTP_STAT_INCR(sctps_pdrpbwrpt); 4389 } else { 4390 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr)); 4391 chlen -= sizeof(struct sctphdr); 4392 /* XXX possible chlen underflow */ 4393 memset(&desc, 0, sizeof(desc)); 4394 } 4395 trunc_len = (uint16_t)ntohs(cp->trunc_len); 4396 if (trunc_len > limit) { 4397 trunc_len = limit; 4398 } 4399 /* now the chunks themselves */ 4400 while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) { 4401 desc.chunk_type = ch->chunk_type; 4402 /* get amount we need to move */ 4403 at = ntohs(ch->chunk_length); 4404 if (at < sizeof(struct sctp_chunkhdr)) { 4405 /* corrupt chunk, maybe at the end? */ 4406 SCTP_STAT_INCR(sctps_pdrpcrupt); 4407 break; 4408 } 4409 if (trunc_len == 0) { 4410 /* we are supposed to have all of it */ 4411 if (at > chlen) { 4412 /* corrupt skip it */ 4413 SCTP_STAT_INCR(sctps_pdrpcrupt); 4414 break; 4415 } 4416 } else { 4417 /* is there enough of it left ? */ 4418 if (desc.chunk_type == SCTP_DATA) { 4419 if (chlen < (sizeof(struct sctp_data_chunk) + 4420 sizeof(desc.data_bytes))) { 4421 break; 4422 } 4423 } else { 4424 if (chlen < sizeof(struct sctp_chunkhdr)) { 4425 break; 4426 } 4427 } 4428 } 4429 if (desc.chunk_type == SCTP_DATA) { 4430 /* can we get out the tsn? */ 4431 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4432 SCTP_STAT_INCR(sctps_pdrpmbda); 4433 4434 if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) { 4435 /* yep */ 4436 struct sctp_data_chunk *dcp; 4437 uint8_t *ddp; 4438 unsigned int iii; 4439 4440 dcp = (struct sctp_data_chunk *)ch; 4441 ddp = (uint8_t *)(dcp + 1); 4442 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) { 4443 desc.data_bytes[iii] = ddp[iii]; 4444 } 4445 desc.tsn_ifany = dcp->dp.tsn; 4446 } else { 4447 /* nope we are done. */ 4448 SCTP_STAT_INCR(sctps_pdrpnedat); 4449 break; 4450 } 4451 } else { 4452 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4453 SCTP_STAT_INCR(sctps_pdrpmbct); 4454 } 4455 4456 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) { 4457 SCTP_STAT_INCR(sctps_pdrppdbrk); 4458 break; 4459 } 4460 if (SCTP_SIZE32(at) > chlen) { 4461 break; 4462 } 4463 chlen -= SCTP_SIZE32(at); 4464 if (chlen < sizeof(struct sctp_chunkhdr)) { 4465 /* done, none left */ 4466 break; 4467 } 4468 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at)); 4469 } 4470 /* Now update any rwnd --- possibly */ 4471 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) { 4472 /* From a peer, we get a rwnd report */ 4473 uint32_t a_rwnd; 4474 4475 SCTP_STAT_INCR(sctps_pdrpfehos); 4476 4477 bottle_bw = ntohl(cp->bottle_bw); 4478 on_queue = ntohl(cp->current_onq); 4479 if (bottle_bw && on_queue) { 4480 /* a rwnd report is in here */ 4481 if (bottle_bw > on_queue) 4482 a_rwnd = bottle_bw - on_queue; 4483 else 4484 a_rwnd = 0; 4485 4486 if (a_rwnd == 0) 4487 stcb->asoc.peers_rwnd = 0; 4488 else { 4489 if (a_rwnd > stcb->asoc.total_flight) { 4490 stcb->asoc.peers_rwnd = 4491 a_rwnd - stcb->asoc.total_flight; 4492 } else { 4493 stcb->asoc.peers_rwnd = 0; 4494 } 4495 if (stcb->asoc.peers_rwnd < 4496 stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 4497 /* SWS sender side engages */ 4498 stcb->asoc.peers_rwnd = 0; 4499 } 4500 } 4501 } 4502 } else { 4503 SCTP_STAT_INCR(sctps_pdrpfmbox); 4504 } 4505 4506 /* now middle boxes in sat networks get a cwnd bump */ 4507 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) && 4508 (stcb->asoc.sat_t3_loss_recovery == 0) && 4509 (stcb->asoc.sat_network)) { 4510 /* 4511 * This is debatable but for sat networks it makes sense 4512 * Note if a T3 timer has went off, we will prohibit any 4513 * changes to cwnd until we exit the t3 loss recovery. 4514 */ 4515 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb, 4516 net, cp, &bottle_bw, &on_queue); 4517 } 4518 } 4519 4520 /* 4521 * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to 4522 * still contain IP/SCTP header - stcb: is the tcb found for this packet - 4523 * offset: offset into the mbuf chain to first chunkhdr - length: is the 4524 * length of the complete packet outputs: - length: modified to remaining 4525 * length after control processing - netp: modified to new sctp_nets after 4526 * cookie-echo processing - return NULL to discard the packet (ie. no asoc, 4527 * bad packet,...) otherwise return the tcb for this packet 4528 */ 4529 #ifdef __GNUC__ 4530 __attribute__((noinline)) 4531 #endif 4532 static struct sctp_tcb * 4533 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length, 4534 struct sockaddr *src, struct sockaddr *dst, 4535 struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp, 4536 struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen, 4537 uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum, 4538 uint32_t vrf_id, uint16_t port) 4539 { 4540 struct sctp_association *asoc; 4541 struct mbuf *op_err; 4542 char msg[SCTP_DIAG_INFO_LEN]; 4543 uint32_t vtag_in; 4544 int num_chunks = 0; /* number of control chunks processed */ 4545 uint32_t chk_length, contiguous; 4546 int ret; 4547 int abort_no_unlock = 0; 4548 int ecne_seen = 0; 4549 4550 /* 4551 * How big should this be, and should it be alloc'd? Lets try the 4552 * d-mtu-ceiling for now (2k) and that should hopefully work ... 4553 * until we get into jumbo grams and such.. 4554 */ 4555 uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE]; 4556 int got_auth = 0; 4557 uint32_t auth_offset = 0, auth_len = 0; 4558 int auth_skipped = 0; 4559 int asconf_cnt = 0; 4560 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4561 struct socket *so; 4562 #endif 4563 4564 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n", 4565 iphlen, *offset, length, (void *)stcb); 4566 4567 if (stcb) { 4568 SCTP_TCB_LOCK_ASSERT(stcb); 4569 } 4570 /* validate chunk header length... */ 4571 if (ntohs(ch->chunk_length) < sizeof(*ch)) { 4572 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n", 4573 ntohs(ch->chunk_length)); 4574 *offset = length; 4575 return (stcb); 4576 } 4577 /* 4578 * validate the verification tag 4579 */ 4580 vtag_in = ntohl(sh->v_tag); 4581 4582 if (ch->chunk_type == SCTP_INITIATION) { 4583 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n", 4584 ntohs(ch->chunk_length), vtag_in); 4585 if (vtag_in != 0) { 4586 /* protocol error- silently discard... */ 4587 SCTP_STAT_INCR(sctps_badvtag); 4588 if (stcb != NULL) { 4589 SCTP_TCB_UNLOCK(stcb); 4590 } 4591 return (NULL); 4592 } 4593 } else if (ch->chunk_type != SCTP_COOKIE_ECHO) { 4594 /* 4595 * If there is no stcb, skip the AUTH chunk and process 4596 * later after a stcb is found (to validate the lookup was 4597 * valid. 4598 */ 4599 if ((ch->chunk_type == SCTP_AUTHENTICATION) && 4600 (stcb == NULL) && 4601 (inp->auth_supported == 1)) { 4602 /* save this chunk for later processing */ 4603 auth_skipped = 1; 4604 auth_offset = *offset; 4605 auth_len = ntohs(ch->chunk_length); 4606 4607 /* (temporarily) move past this chunk */ 4608 *offset += SCTP_SIZE32(auth_len); 4609 if (*offset >= length) { 4610 /* no more data left in the mbuf chain */ 4611 *offset = length; 4612 return (NULL); 4613 } 4614 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4615 sizeof(struct sctp_chunkhdr), chunk_buf); 4616 } 4617 if (ch == NULL) { 4618 /* Help */ 4619 *offset = length; 4620 return (stcb); 4621 } 4622 if (ch->chunk_type == SCTP_COOKIE_ECHO) { 4623 goto process_control_chunks; 4624 } 4625 /* 4626 * first check if it's an ASCONF with an unknown src addr we 4627 * need to look inside to find the association 4628 */ 4629 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) { 4630 struct sctp_chunkhdr *asconf_ch = ch; 4631 uint32_t asconf_offset = 0, asconf_len = 0; 4632 4633 /* inp's refcount may be reduced */ 4634 SCTP_INP_INCR_REF(inp); 4635 4636 asconf_offset = *offset; 4637 do { 4638 asconf_len = ntohs(asconf_ch->chunk_length); 4639 if (asconf_len < sizeof(struct sctp_asconf_paramhdr)) 4640 break; 4641 stcb = sctp_findassociation_ep_asconf(m, 4642 *offset, 4643 dst, 4644 sh, &inp, netp, vrf_id); 4645 if (stcb != NULL) 4646 break; 4647 asconf_offset += SCTP_SIZE32(asconf_len); 4648 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset, 4649 sizeof(struct sctp_chunkhdr), chunk_buf); 4650 } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF); 4651 if (stcb == NULL) { 4652 /* 4653 * reduce inp's refcount if not reduced in 4654 * sctp_findassociation_ep_asconf(). 4655 */ 4656 SCTP_INP_DECR_REF(inp); 4657 } 4658 /* now go back and verify any auth chunk to be sure */ 4659 if (auth_skipped && (stcb != NULL)) { 4660 struct sctp_auth_chunk *auth; 4661 4662 auth = (struct sctp_auth_chunk *) 4663 sctp_m_getptr(m, auth_offset, 4664 auth_len, chunk_buf); 4665 got_auth = 1; 4666 auth_skipped = 0; 4667 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, 4668 auth_offset)) { 4669 /* auth HMAC failed so dump it */ 4670 *offset = length; 4671 return (stcb); 4672 } else { 4673 /* remaining chunks are HMAC checked */ 4674 stcb->asoc.authenticated = 1; 4675 } 4676 } 4677 } 4678 if (stcb == NULL) { 4679 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 4680 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4681 msg); 4682 /* no association, so it's out of the blue... */ 4683 sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, op_err, 4684 mflowtype, mflowid, inp->fibnum, 4685 vrf_id, port); 4686 *offset = length; 4687 return (NULL); 4688 } 4689 asoc = &stcb->asoc; 4690 /* ABORT and SHUTDOWN can use either v_tag... */ 4691 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) || 4692 (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) || 4693 (ch->chunk_type == SCTP_PACKET_DROPPED)) { 4694 /* Take the T-bit always into account. */ 4695 if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) && 4696 (vtag_in == asoc->my_vtag)) || 4697 (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) && 4698 (asoc->peer_vtag != htonl(0)) && 4699 (vtag_in == asoc->peer_vtag))) { 4700 /* this is valid */ 4701 } else { 4702 /* drop this packet... */ 4703 SCTP_STAT_INCR(sctps_badvtag); 4704 if (stcb != NULL) { 4705 SCTP_TCB_UNLOCK(stcb); 4706 } 4707 return (NULL); 4708 } 4709 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 4710 if (vtag_in != asoc->my_vtag) { 4711 /* 4712 * this could be a stale SHUTDOWN-ACK or the 4713 * peer never got the SHUTDOWN-COMPLETE and 4714 * is still hung; we have started a new asoc 4715 * but it won't complete until the shutdown 4716 * is completed 4717 */ 4718 if (stcb != NULL) { 4719 SCTP_TCB_UNLOCK(stcb); 4720 } 4721 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 4722 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4723 msg); 4724 sctp_handle_ootb(m, iphlen, *offset, src, dst, 4725 sh, inp, op_err, 4726 mflowtype, mflowid, fibnum, 4727 vrf_id, port); 4728 return (NULL); 4729 } 4730 } else { 4731 /* for all other chunks, vtag must match */ 4732 if (vtag_in != asoc->my_vtag) { 4733 /* invalid vtag... */ 4734 SCTPDBG(SCTP_DEBUG_INPUT3, 4735 "invalid vtag: %xh, expect %xh\n", 4736 vtag_in, asoc->my_vtag); 4737 SCTP_STAT_INCR(sctps_badvtag); 4738 if (stcb != NULL) { 4739 SCTP_TCB_UNLOCK(stcb); 4740 } 4741 *offset = length; 4742 return (NULL); 4743 } 4744 } 4745 } /* end if !SCTP_COOKIE_ECHO */ 4746 /* 4747 * process all control chunks... 4748 */ 4749 if (((ch->chunk_type == SCTP_SELECTIVE_ACK) || 4750 (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) || 4751 (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) && 4752 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) { 4753 /* implied cookie-ack.. we must have lost the ack */ 4754 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, 4755 *netp); 4756 } 4757 process_control_chunks: 4758 while (IS_SCTP_CONTROL(ch)) { 4759 /* validate chunk length */ 4760 chk_length = ntohs(ch->chunk_length); 4761 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n", 4762 ch->chunk_type, chk_length); 4763 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length); 4764 if (chk_length < sizeof(*ch) || 4765 (*offset + (int)chk_length) > length) { 4766 *offset = length; 4767 return (stcb); 4768 } 4769 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks); 4770 /* 4771 * INIT and INIT-ACK only gets the init ack "header" portion 4772 * only because we don't have to process the peer's COOKIE. 4773 * All others get a complete chunk. 4774 */ 4775 switch (ch->chunk_type) { 4776 case SCTP_INITIATION: 4777 contiguous = sizeof(struct sctp_init_chunk); 4778 break; 4779 case SCTP_INITIATION_ACK: 4780 contiguous = sizeof(struct sctp_init_ack_chunk); 4781 break; 4782 default: 4783 contiguous = min(chk_length, sizeof(chunk_buf)); 4784 break; 4785 } 4786 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4787 contiguous, 4788 chunk_buf); 4789 if (ch == NULL) { 4790 *offset = length; 4791 if (stcb != NULL) { 4792 SCTP_TCB_UNLOCK(stcb); 4793 } 4794 return (NULL); 4795 } 4796 num_chunks++; 4797 /* Save off the last place we got a control from */ 4798 if (stcb != NULL) { 4799 if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) { 4800 /* 4801 * allow last_control to be NULL if 4802 * ASCONF... ASCONF processing will find the 4803 * right net later 4804 */ 4805 if ((netp != NULL) && (*netp != NULL)) 4806 stcb->asoc.last_control_chunk_from = *netp; 4807 } 4808 } 4809 #ifdef SCTP_AUDITING_ENABLED 4810 sctp_audit_log(0xB0, ch->chunk_type); 4811 #endif 4812 4813 /* check to see if this chunk required auth, but isn't */ 4814 if ((stcb != NULL) && 4815 (stcb->asoc.auth_supported == 1) && 4816 sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) && 4817 !stcb->asoc.authenticated) { 4818 /* "silently" ignore */ 4819 SCTP_STAT_INCR(sctps_recvauthmissing); 4820 goto next_chunk; 4821 } 4822 switch (ch->chunk_type) { 4823 case SCTP_INITIATION: 4824 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n"); 4825 /* The INIT chunk must be the only chunk. */ 4826 if ((num_chunks > 1) || 4827 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4828 /* RFC 4960 requires that no ABORT is sent */ 4829 *offset = length; 4830 if (stcb != NULL) { 4831 SCTP_TCB_UNLOCK(stcb); 4832 } 4833 return (NULL); 4834 } 4835 /* Honor our resource limit. */ 4836 if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) { 4837 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 4838 sctp_abort_association(inp, stcb, m, iphlen, 4839 src, dst, sh, op_err, 4840 mflowtype, mflowid, 4841 vrf_id, port); 4842 *offset = length; 4843 return (NULL); 4844 } 4845 sctp_handle_init(m, iphlen, *offset, src, dst, sh, 4846 (struct sctp_init_chunk *)ch, inp, 4847 stcb, *netp, &abort_no_unlock, 4848 mflowtype, mflowid, 4849 vrf_id, port); 4850 *offset = length; 4851 if ((!abort_no_unlock) && (stcb != NULL)) { 4852 SCTP_TCB_UNLOCK(stcb); 4853 } 4854 return (NULL); 4855 break; 4856 case SCTP_PAD_CHUNK: 4857 break; 4858 case SCTP_INITIATION_ACK: 4859 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT_ACK\n"); 4860 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4861 /* We are not interested anymore */ 4862 if ((stcb != NULL) && (stcb->asoc.total_output_queue_size)) { 4863 ; 4864 } else { 4865 *offset = length; 4866 if (stcb != NULL) { 4867 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4868 so = SCTP_INP_SO(inp); 4869 atomic_add_int(&stcb->asoc.refcnt, 1); 4870 SCTP_TCB_UNLOCK(stcb); 4871 SCTP_SOCKET_LOCK(so, 1); 4872 SCTP_TCB_LOCK(stcb); 4873 atomic_subtract_int(&stcb->asoc.refcnt, 1); 4874 #endif 4875 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 4876 SCTP_FROM_SCTP_INPUT + SCTP_LOC_29); 4877 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4878 SCTP_SOCKET_UNLOCK(so, 1); 4879 #endif 4880 } 4881 return (NULL); 4882 } 4883 } 4884 /* The INIT-ACK chunk must be the only chunk. */ 4885 if ((num_chunks > 1) || 4886 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4887 *offset = length; 4888 return (stcb); 4889 } 4890 if ((netp != NULL) && (*netp != NULL)) { 4891 ret = sctp_handle_init_ack(m, iphlen, *offset, 4892 src, dst, sh, 4893 (struct sctp_init_ack_chunk *)ch, 4894 stcb, *netp, 4895 &abort_no_unlock, 4896 mflowtype, mflowid, 4897 vrf_id); 4898 } else { 4899 ret = -1; 4900 } 4901 *offset = length; 4902 if (abort_no_unlock) { 4903 return (NULL); 4904 } 4905 /* 4906 * Special case, I must call the output routine to 4907 * get the cookie echoed 4908 */ 4909 if ((stcb != NULL) && (ret == 0)) { 4910 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 4911 } 4912 return (stcb); 4913 break; 4914 case SCTP_SELECTIVE_ACK: 4915 case SCTP_NR_SELECTIVE_ACK: 4916 { 4917 int abort_now = 0; 4918 uint32_t a_rwnd, cum_ack; 4919 uint16_t num_seg, num_nr_seg, num_dup; 4920 uint8_t flags; 4921 int offset_seg, offset_dup; 4922 4923 SCTPDBG(SCTP_DEBUG_INPUT3, "%s\n", 4924 ch->chunk_type == SCTP_SELECTIVE_ACK ? "SCTP_SACK" : "SCTP_NR_SACK"); 4925 SCTP_STAT_INCR(sctps_recvsacks); 4926 if (stcb == NULL) { 4927 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing %s chunk\n", 4928 (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK"); 4929 break; 4930 } 4931 if (ch->chunk_type == SCTP_SELECTIVE_ACK) { 4932 if (chk_length < sizeof(struct sctp_sack_chunk)) { 4933 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n"); 4934 break; 4935 } 4936 } else { 4937 if (stcb->asoc.nrsack_supported == 0) { 4938 goto unknown_chunk; 4939 } 4940 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) { 4941 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR_SACK chunk, too small\n"); 4942 break; 4943 } 4944 } 4945 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4946 /*- 4947 * If we have sent a shutdown-ack, we will pay no 4948 * attention to a sack sent in to us since 4949 * we don't care anymore. 4950 */ 4951 break; 4952 } 4953 flags = ch->chunk_flags; 4954 if (ch->chunk_type == SCTP_SELECTIVE_ACK) { 4955 struct sctp_sack_chunk *sack; 4956 4957 sack = (struct sctp_sack_chunk *)ch; 4958 cum_ack = ntohl(sack->sack.cum_tsn_ack); 4959 num_seg = ntohs(sack->sack.num_gap_ack_blks); 4960 num_nr_seg = 0; 4961 num_dup = ntohs(sack->sack.num_dup_tsns); 4962 a_rwnd = ntohl(sack->sack.a_rwnd); 4963 if (sizeof(struct sctp_sack_chunk) + 4964 num_seg * sizeof(struct sctp_gap_ack_block) + 4965 num_dup * sizeof(uint32_t) != chk_length) { 4966 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n"); 4967 break; 4968 } 4969 offset_seg = *offset + sizeof(struct sctp_sack_chunk); 4970 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 4971 } else { 4972 struct sctp_nr_sack_chunk *nr_sack; 4973 4974 nr_sack = (struct sctp_nr_sack_chunk *)ch; 4975 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack); 4976 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks); 4977 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks); 4978 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns); 4979 a_rwnd = ntohl(nr_sack->nr_sack.a_rwnd); 4980 if (sizeof(struct sctp_nr_sack_chunk) + 4981 (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) + 4982 num_dup * sizeof(uint32_t) != chk_length) { 4983 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n"); 4984 break; 4985 } 4986 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk); 4987 offset_dup = offset_seg + (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block); 4988 } 4989 SCTPDBG(SCTP_DEBUG_INPUT3, "%s process cum_ack:%x num_seg:%d a_rwnd:%d\n", 4990 (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK", 4991 cum_ack, num_seg, a_rwnd); 4992 stcb->asoc.seen_a_sack_this_pkt = 1; 4993 if ((stcb->asoc.pr_sctp_cnt == 0) && 4994 (num_seg == 0) && (num_nr_seg == 0) && 4995 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 4996 (stcb->asoc.saw_sack_with_frags == 0) && 4997 (stcb->asoc.saw_sack_with_nr_frags == 0) && 4998 (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) { 4999 /* 5000 * We have a SIMPLE sack having no 5001 * prior segments and data on sent 5002 * queue to be acked. Use the faster 5003 * path sack processing. We also 5004 * allow window update sacks with no 5005 * missing segments to go this way 5006 * too. 5007 */ 5008 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, 5009 &abort_now, ecne_seen); 5010 } else { 5011 if ((netp != NULL) && (*netp != NULL)) { 5012 sctp_handle_sack(m, offset_seg, offset_dup, stcb, 5013 num_seg, num_nr_seg, num_dup, &abort_now, flags, 5014 cum_ack, a_rwnd, ecne_seen); 5015 } 5016 } 5017 if (abort_now) { 5018 /* ABORT signal from sack processing */ 5019 *offset = length; 5020 return (NULL); 5021 } 5022 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 5023 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 5024 (stcb->asoc.stream_queue_cnt == 0)) { 5025 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 5026 } 5027 break; 5028 } 5029 case SCTP_HEARTBEAT_REQUEST: 5030 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n"); 5031 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 5032 SCTP_STAT_INCR(sctps_recvheartbeat); 5033 sctp_send_heartbeat_ack(stcb, m, *offset, 5034 chk_length, *netp); 5035 } 5036 break; 5037 case SCTP_HEARTBEAT_ACK: 5038 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT_ACK\n"); 5039 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) { 5040 /* Its not ours */ 5041 *offset = length; 5042 return (stcb); 5043 } 5044 SCTP_STAT_INCR(sctps_recvheartbeatack); 5045 if ((netp != NULL) && (*netp != NULL)) { 5046 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch, 5047 stcb, *netp); 5048 } 5049 break; 5050 case SCTP_ABORT_ASSOCIATION: 5051 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n", 5052 (void *)stcb); 5053 *offset = length; 5054 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 5055 if (sctp_handle_abort((struct sctp_abort_chunk *)ch, stcb, *netp)) { 5056 return (NULL); 5057 } else { 5058 return (stcb); 5059 } 5060 } else { 5061 return (NULL); 5062 } 5063 break; 5064 case SCTP_SHUTDOWN: 5065 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n", 5066 (void *)stcb); 5067 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) { 5068 *offset = length; 5069 return (stcb); 5070 } 5071 if ((netp != NULL) && (*netp != NULL)) { 5072 int abort_flag = 0; 5073 5074 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch, 5075 stcb, *netp, &abort_flag); 5076 if (abort_flag) { 5077 *offset = length; 5078 return (NULL); 5079 } 5080 } 5081 break; 5082 case SCTP_SHUTDOWN_ACK: 5083 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_ACK, stcb %p\n", (void *)stcb); 5084 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 5085 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp); 5086 } 5087 *offset = length; 5088 return (NULL); 5089 break; 5090 case SCTP_OPERATION_ERROR: 5091 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP_ERR\n"); 5092 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL) && 5093 sctp_handle_error(ch, stcb, *netp, contiguous) < 0) { 5094 *offset = length; 5095 return (NULL); 5096 } 5097 break; 5098 case SCTP_COOKIE_ECHO: 5099 SCTPDBG(SCTP_DEBUG_INPUT3, 5100 "SCTP_COOKIE_ECHO, stcb %p\n", (void *)stcb); 5101 if ((stcb != NULL) && (stcb->asoc.total_output_queue_size > 0)) { 5102 ; 5103 } else { 5104 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5105 /* We are not interested anymore */ 5106 abend: 5107 if (stcb != NULL) { 5108 SCTP_TCB_UNLOCK(stcb); 5109 } 5110 *offset = length; 5111 return (NULL); 5112 } 5113 } 5114 /*- 5115 * First are we accepting? We do this again here 5116 * since it is possible that a previous endpoint WAS 5117 * listening responded to a INIT-ACK and then 5118 * closed. We opened and bound.. and are now no 5119 * longer listening. 5120 * 5121 * XXXGL: notes on checking listen queue length. 5122 * 1) SCTP_IS_LISTENING() doesn't necessarily mean 5123 * SOLISTENING(), because a listening "UDP type" 5124 * socket isn't listening in terms of the socket 5125 * layer. It is a normal data flow socket, that 5126 * can fork off new connections. Thus, we should 5127 * look into sol_qlen only in case we are !UDP. 5128 * 2) Checking sol_qlen in general requires locking 5129 * the socket, and this code lacks that. 5130 */ 5131 if ((stcb == NULL) && 5132 (!SCTP_IS_LISTENING(inp) || 5133 (!(inp->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE) && 5134 inp->sctp_socket->sol_qlen >= inp->sctp_socket->sol_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 != NULL) { 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 != NULL) { 5164 struct sctp_tcb *locked_stcb; 5165 5166 locked_stcb = stcb; 5167 ret_buf = 5168 sctp_handle_cookie_echo(m, iphlen, 5169 *offset, 5170 src, dst, 5171 sh, 5172 (struct sctp_cookie_echo_chunk *)ch, 5173 &inp, &stcb, netp, 5174 auth_skipped, 5175 auth_offset, 5176 auth_len, 5177 &locked_stcb, 5178 mflowtype, 5179 mflowid, 5180 vrf_id, 5181 port); 5182 if ((locked_stcb != NULL) && (locked_stcb != stcb)) { 5183 SCTP_TCB_UNLOCK(locked_stcb); 5184 } 5185 if (stcb != NULL) { 5186 SCTP_TCB_LOCK_ASSERT(stcb); 5187 } 5188 } else { 5189 ret_buf = NULL; 5190 } 5191 if (linp != NULL) { 5192 SCTP_ASOC_CREATE_UNLOCK(linp); 5193 } 5194 if (ret_buf == NULL) { 5195 if (stcb != NULL) { 5196 SCTP_TCB_UNLOCK(stcb); 5197 } 5198 SCTPDBG(SCTP_DEBUG_INPUT3, 5199 "GAK, null buffer\n"); 5200 *offset = length; 5201 return (NULL); 5202 } 5203 /* if AUTH skipped, see if it verified... */ 5204 if (auth_skipped) { 5205 got_auth = 1; 5206 auth_skipped = 0; 5207 } 5208 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) { 5209 /* 5210 * Restart the timer if we have 5211 * pending data 5212 */ 5213 struct sctp_tmit_chunk *chk; 5214 5215 chk = TAILQ_FIRST(&stcb->asoc.sent_queue); 5216 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 5217 } 5218 } 5219 break; 5220 case SCTP_COOKIE_ACK: 5221 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE_ACK, stcb %p\n", (void *)stcb); 5222 if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) { 5223 return (stcb); 5224 } 5225 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5226 /* We are not interested anymore */ 5227 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 5228 ; 5229 } else if (stcb) { 5230 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5231 so = SCTP_INP_SO(inp); 5232 atomic_add_int(&stcb->asoc.refcnt, 1); 5233 SCTP_TCB_UNLOCK(stcb); 5234 SCTP_SOCKET_LOCK(so, 1); 5235 SCTP_TCB_LOCK(stcb); 5236 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5237 #endif 5238 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 5239 SCTP_FROM_SCTP_INPUT + SCTP_LOC_30); 5240 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5241 SCTP_SOCKET_UNLOCK(so, 1); 5242 #endif 5243 *offset = length; 5244 return (NULL); 5245 } 5246 } 5247 if ((netp != NULL) && (*netp != NULL)) { 5248 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp); 5249 } 5250 break; 5251 case SCTP_ECN_ECHO: 5252 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_ECHO\n"); 5253 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) { 5254 /* Its not ours */ 5255 *offset = length; 5256 return (stcb); 5257 } 5258 if (stcb->asoc.ecn_supported == 0) { 5259 goto unknown_chunk; 5260 } 5261 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, stcb); 5262 ecne_seen = 1; 5263 break; 5264 case SCTP_ECN_CWR: 5265 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_CWR\n"); 5266 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) { 5267 *offset = length; 5268 return (stcb); 5269 } 5270 if (stcb->asoc.ecn_supported == 0) { 5271 goto unknown_chunk; 5272 } 5273 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp); 5274 break; 5275 case SCTP_SHUTDOWN_COMPLETE: 5276 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_COMPLETE, stcb %p\n", (void *)stcb); 5277 /* must be first and only chunk */ 5278 if ((num_chunks > 1) || 5279 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 5280 *offset = length; 5281 return (stcb); 5282 } 5283 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 5284 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch, 5285 stcb, *netp); 5286 } 5287 *offset = length; 5288 return (NULL); 5289 break; 5290 case SCTP_ASCONF: 5291 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n"); 5292 if (stcb != NULL) { 5293 if (stcb->asoc.asconf_supported == 0) { 5294 goto unknown_chunk; 5295 } 5296 sctp_handle_asconf(m, *offset, src, 5297 (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0); 5298 asconf_cnt++; 5299 } 5300 break; 5301 case SCTP_ASCONF_ACK: 5302 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF_ACK\n"); 5303 if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) { 5304 /* Its not ours */ 5305 *offset = length; 5306 return (stcb); 5307 } 5308 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 5309 if (stcb->asoc.asconf_supported == 0) { 5310 goto unknown_chunk; 5311 } 5312 /* He's alive so give him credit */ 5313 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5314 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5315 stcb->asoc.overall_error_count, 5316 0, 5317 SCTP_FROM_SCTP_INPUT, 5318 __LINE__); 5319 } 5320 stcb->asoc.overall_error_count = 0; 5321 sctp_handle_asconf_ack(m, *offset, 5322 (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock); 5323 if (abort_no_unlock) 5324 return (NULL); 5325 } 5326 break; 5327 case SCTP_FORWARD_CUM_TSN: 5328 case SCTP_IFORWARD_CUM_TSN: 5329 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD_TSN\n"); 5330 if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) { 5331 /* Its not ours */ 5332 *offset = length; 5333 return (stcb); 5334 } 5335 if (stcb != NULL) { 5336 int abort_flag = 0; 5337 5338 if (stcb->asoc.prsctp_supported == 0) { 5339 goto unknown_chunk; 5340 } 5341 *fwd_tsn_seen = 1; 5342 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5343 /* We are not interested anymore */ 5344 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5345 so = SCTP_INP_SO(inp); 5346 atomic_add_int(&stcb->asoc.refcnt, 1); 5347 SCTP_TCB_UNLOCK(stcb); 5348 SCTP_SOCKET_LOCK(so, 1); 5349 SCTP_TCB_LOCK(stcb); 5350 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5351 #endif 5352 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 5353 SCTP_FROM_SCTP_INPUT + SCTP_LOC_31); 5354 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5355 SCTP_SOCKET_UNLOCK(so, 1); 5356 #endif 5357 *offset = length; 5358 return (NULL); 5359 } 5360 /* 5361 * For sending a SACK this looks like DATA 5362 * chunks. 5363 */ 5364 stcb->asoc.last_data_chunk_from = stcb->asoc.last_control_chunk_from; 5365 sctp_handle_forward_tsn(stcb, 5366 (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset); 5367 if (abort_flag) { 5368 *offset = length; 5369 return (NULL); 5370 } 5371 } 5372 break; 5373 case SCTP_STREAM_RESET: 5374 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n"); 5375 if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) { 5376 /* Its not ours */ 5377 *offset = length; 5378 return (stcb); 5379 } 5380 if (stcb->asoc.reconfig_supported == 0) { 5381 goto unknown_chunk; 5382 } 5383 if (sctp_handle_stream_reset(stcb, m, *offset, ch)) { 5384 /* stop processing */ 5385 *offset = length; 5386 return (NULL); 5387 } 5388 break; 5389 case SCTP_PACKET_DROPPED: 5390 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n"); 5391 /* re-get it all please */ 5392 if (chk_length < sizeof(struct sctp_pktdrop_chunk)) { 5393 /* Its not ours */ 5394 *offset = length; 5395 return (stcb); 5396 } 5397 if ((ch != NULL) && (stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 5398 if (stcb->asoc.pktdrop_supported == 0) { 5399 goto unknown_chunk; 5400 } 5401 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch, 5402 stcb, *netp, 5403 min(chk_length, contiguous)); 5404 } 5405 break; 5406 case SCTP_AUTHENTICATION: 5407 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n"); 5408 if (stcb == NULL) { 5409 /* save the first AUTH for later processing */ 5410 if (auth_skipped == 0) { 5411 auth_offset = *offset; 5412 auth_len = chk_length; 5413 auth_skipped = 1; 5414 } 5415 /* skip this chunk (temporarily) */ 5416 goto next_chunk; 5417 } 5418 if (stcb->asoc.auth_supported == 0) { 5419 goto unknown_chunk; 5420 } 5421 if ((chk_length < (sizeof(struct sctp_auth_chunk))) || 5422 (chk_length > (sizeof(struct sctp_auth_chunk) + 5423 SCTP_AUTH_DIGEST_LEN_MAX))) { 5424 /* Its not ours */ 5425 *offset = length; 5426 return (stcb); 5427 } 5428 if (got_auth == 1) { 5429 /* skip this chunk... it's already auth'd */ 5430 goto next_chunk; 5431 } 5432 got_auth = 1; 5433 if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch, 5434 m, *offset)) { 5435 /* auth HMAC failed so dump the packet */ 5436 *offset = length; 5437 return (stcb); 5438 } else { 5439 /* remaining chunks are HMAC checked */ 5440 stcb->asoc.authenticated = 1; 5441 } 5442 break; 5443 5444 default: 5445 unknown_chunk: 5446 /* it's an unknown chunk! */ 5447 if ((ch->chunk_type & 0x40) && (stcb != NULL)) { 5448 struct sctp_gen_error_cause *cause; 5449 int len; 5450 5451 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_gen_error_cause), 5452 0, M_NOWAIT, 1, MT_DATA); 5453 if (op_err != NULL) { 5454 len = min(SCTP_SIZE32(chk_length), (uint32_t)(length - *offset)); 5455 cause = mtod(op_err, struct sctp_gen_error_cause *); 5456 cause->code = htons(SCTP_CAUSE_UNRECOG_CHUNK); 5457 cause->length = htons((uint16_t)(len + sizeof(struct sctp_gen_error_cause))); 5458 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_gen_error_cause); 5459 SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(m, *offset, len, M_NOWAIT); 5460 if (SCTP_BUF_NEXT(op_err) != NULL) { 5461 #ifdef SCTP_MBUF_LOGGING 5462 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5463 sctp_log_mbc(SCTP_BUF_NEXT(op_err), SCTP_MBUF_ICOPY); 5464 } 5465 #endif 5466 sctp_queue_op_err(stcb, op_err); 5467 } else { 5468 sctp_m_freem(op_err); 5469 } 5470 } 5471 } 5472 if ((ch->chunk_type & 0x80) == 0) { 5473 /* discard this packet */ 5474 *offset = length; 5475 return (stcb); 5476 } /* else skip this bad chunk and continue... */ 5477 break; 5478 } /* switch (ch->chunk_type) */ 5479 5480 5481 next_chunk: 5482 /* get the next chunk */ 5483 *offset += SCTP_SIZE32(chk_length); 5484 if (*offset >= length) { 5485 /* no more data left in the mbuf chain */ 5486 break; 5487 } 5488 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 5489 sizeof(struct sctp_chunkhdr), chunk_buf); 5490 if (ch == NULL) { 5491 *offset = length; 5492 return (stcb); 5493 } 5494 } /* while */ 5495 5496 if ((asconf_cnt > 0) && (stcb != NULL)) { 5497 sctp_send_asconf_ack(stcb); 5498 } 5499 return (stcb); 5500 } 5501 5502 5503 /* 5504 * common input chunk processing (v4 and v6) 5505 */ 5506 void 5507 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length, 5508 struct sockaddr *src, struct sockaddr *dst, 5509 struct sctphdr *sh, struct sctp_chunkhdr *ch, 5510 uint8_t compute_crc, 5511 uint8_t ecn_bits, 5512 uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum, 5513 uint32_t vrf_id, uint16_t port) 5514 { 5515 uint32_t high_tsn; 5516 int fwd_tsn_seen = 0, data_processed = 0; 5517 struct mbuf *m = *mm, *op_err; 5518 char msg[SCTP_DIAG_INFO_LEN]; 5519 int un_sent; 5520 int cnt_ctrl_ready = 0; 5521 struct sctp_inpcb *inp = NULL, *inp_decr = NULL; 5522 struct sctp_tcb *stcb = NULL; 5523 struct sctp_nets *net = NULL; 5524 5525 SCTP_STAT_INCR(sctps_recvdatagrams); 5526 #ifdef SCTP_AUDITING_ENABLED 5527 sctp_audit_log(0xE0, 1); 5528 sctp_auditing(0, inp, stcb, net); 5529 #endif 5530 if (compute_crc != 0) { 5531 uint32_t check, calc_check; 5532 5533 check = sh->checksum; 5534 sh->checksum = 0; 5535 calc_check = sctp_calculate_cksum(m, iphlen); 5536 sh->checksum = check; 5537 if (calc_check != check) { 5538 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x m:%p mlen:%d iphlen:%d\n", 5539 calc_check, check, (void *)m, length, iphlen); 5540 stcb = sctp_findassociation_addr(m, offset, src, dst, 5541 sh, ch, &inp, &net, vrf_id); 5542 #if defined(INET) || defined(INET6) 5543 if ((ch->chunk_type != SCTP_INITIATION) && 5544 (net != NULL) && (net->port != port)) { 5545 if (net->port == 0) { 5546 /* UDP encapsulation turned on. */ 5547 net->mtu -= sizeof(struct udphdr); 5548 if (stcb->asoc.smallest_mtu > net->mtu) { 5549 sctp_pathmtu_adjustment(stcb, net->mtu); 5550 } 5551 } else if (port == 0) { 5552 /* UDP encapsulation turned off. */ 5553 net->mtu += sizeof(struct udphdr); 5554 /* XXX Update smallest_mtu */ 5555 } 5556 net->port = port; 5557 } 5558 #endif 5559 if (net != NULL) { 5560 net->flowtype = mflowtype; 5561 net->flowid = mflowid; 5562 } 5563 if ((inp != NULL) && (stcb != NULL)) { 5564 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1); 5565 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED); 5566 } else if ((inp != NULL) && (stcb == NULL)) { 5567 inp_decr = inp; 5568 } 5569 SCTP_STAT_INCR(sctps_badsum); 5570 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors); 5571 goto out; 5572 } 5573 } 5574 /* Destination port of 0 is illegal, based on RFC4960. */ 5575 if (sh->dest_port == 0) { 5576 SCTP_STAT_INCR(sctps_hdrops); 5577 goto out; 5578 } 5579 stcb = sctp_findassociation_addr(m, offset, src, dst, 5580 sh, ch, &inp, &net, vrf_id); 5581 #if defined(INET) || defined(INET6) 5582 if ((ch->chunk_type != SCTP_INITIATION) && 5583 (net != NULL) && (net->port != port)) { 5584 if (net->port == 0) { 5585 /* UDP encapsulation turned on. */ 5586 net->mtu -= sizeof(struct udphdr); 5587 if (stcb->asoc.smallest_mtu > net->mtu) { 5588 sctp_pathmtu_adjustment(stcb, net->mtu); 5589 } 5590 } else if (port == 0) { 5591 /* UDP encapsulation turned off. */ 5592 net->mtu += sizeof(struct udphdr); 5593 /* XXX Update smallest_mtu */ 5594 } 5595 net->port = port; 5596 } 5597 #endif 5598 if (net != NULL) { 5599 net->flowtype = mflowtype; 5600 net->flowid = mflowid; 5601 } 5602 if (inp == NULL) { 5603 SCTP_STAT_INCR(sctps_noport); 5604 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) { 5605 goto out; 5606 } 5607 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 5608 sctp_send_shutdown_complete2(src, dst, sh, 5609 mflowtype, mflowid, fibnum, 5610 vrf_id, port); 5611 goto out; 5612 } 5613 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) { 5614 goto out; 5615 } 5616 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) { 5617 if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) || 5618 ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) && 5619 (ch->chunk_type != SCTP_INIT))) { 5620 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5621 "Out of the blue"); 5622 sctp_send_abort(m, iphlen, src, dst, 5623 sh, 0, op_err, 5624 mflowtype, mflowid, fibnum, 5625 vrf_id, port); 5626 } 5627 } 5628 goto out; 5629 } else if (stcb == NULL) { 5630 inp_decr = inp; 5631 } 5632 SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n", 5633 (void *)m, iphlen, offset, length, (void *)stcb); 5634 if (stcb) { 5635 /* always clear this before beginning a packet */ 5636 stcb->asoc.authenticated = 0; 5637 stcb->asoc.seen_a_sack_this_pkt = 0; 5638 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n", 5639 (void *)stcb, stcb->asoc.state); 5640 5641 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) || 5642 (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) { 5643 /*- 5644 * If we hit here, we had a ref count 5645 * up when the assoc was aborted and the 5646 * timer is clearing out the assoc, we should 5647 * NOT respond to any packet.. its OOTB. 5648 */ 5649 SCTP_TCB_UNLOCK(stcb); 5650 stcb = NULL; 5651 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5652 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5653 msg); 5654 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5655 mflowtype, mflowid, inp->fibnum, 5656 vrf_id, port); 5657 goto out; 5658 } 5659 } 5660 if (IS_SCTP_CONTROL(ch)) { 5661 /* process the control portion of the SCTP packet */ 5662 /* sa_ignore NO_NULL_CHK */ 5663 stcb = sctp_process_control(m, iphlen, &offset, length, 5664 src, dst, sh, ch, 5665 inp, stcb, &net, &fwd_tsn_seen, 5666 mflowtype, mflowid, fibnum, 5667 vrf_id, port); 5668 if (stcb) { 5669 /* 5670 * This covers us if the cookie-echo was there and 5671 * it changes our INP. 5672 */ 5673 inp = stcb->sctp_ep; 5674 #if defined(INET) || defined(INET6) 5675 if ((ch->chunk_type != SCTP_INITIATION) && 5676 (net != NULL) && (net->port != port)) { 5677 if (net->port == 0) { 5678 /* UDP encapsulation turned on. */ 5679 net->mtu -= sizeof(struct udphdr); 5680 if (stcb->asoc.smallest_mtu > net->mtu) { 5681 sctp_pathmtu_adjustment(stcb, net->mtu); 5682 } 5683 } else if (port == 0) { 5684 /* UDP encapsulation turned off. */ 5685 net->mtu += sizeof(struct udphdr); 5686 /* XXX Update smallest_mtu */ 5687 } 5688 net->port = port; 5689 } 5690 #endif 5691 } 5692 } else { 5693 /* 5694 * no control chunks, so pre-process DATA chunks (these 5695 * checks are taken care of by control processing) 5696 */ 5697 5698 /* 5699 * if DATA only packet, and auth is required, then punt... 5700 * can't have authenticated without any AUTH (control) 5701 * chunks 5702 */ 5703 if ((stcb != NULL) && 5704 (stcb->asoc.auth_supported == 1) && 5705 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) { 5706 /* "silently" ignore */ 5707 SCTP_STAT_INCR(sctps_recvauthmissing); 5708 goto out; 5709 } 5710 if (stcb == NULL) { 5711 /* out of the blue DATA chunk */ 5712 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5713 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5714 msg); 5715 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5716 mflowtype, mflowid, fibnum, 5717 vrf_id, port); 5718 goto out; 5719 } 5720 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) { 5721 /* v_tag mismatch! */ 5722 SCTP_STAT_INCR(sctps_badvtag); 5723 goto out; 5724 } 5725 } 5726 5727 if (stcb == NULL) { 5728 /* 5729 * no valid TCB for this packet, or we found it's a bad 5730 * packet while processing control, or we're done with this 5731 * packet (done or skip rest of data), so we drop it... 5732 */ 5733 goto out; 5734 } 5735 /* 5736 * DATA chunk processing 5737 */ 5738 /* plow through the data chunks while length > offset */ 5739 5740 /* 5741 * Rest should be DATA only. Check authentication state if AUTH for 5742 * DATA is required. 5743 */ 5744 if ((length > offset) && 5745 (stcb != NULL) && 5746 (stcb->asoc.auth_supported == 1) && 5747 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) && 5748 !stcb->asoc.authenticated) { 5749 /* "silently" ignore */ 5750 SCTP_STAT_INCR(sctps_recvauthmissing); 5751 SCTPDBG(SCTP_DEBUG_AUTH1, 5752 "Data chunk requires AUTH, skipped\n"); 5753 goto trigger_send; 5754 } 5755 if (length > offset) { 5756 int retval; 5757 5758 /* 5759 * First check to make sure our state is correct. We would 5760 * not get here unless we really did have a tag, so we don't 5761 * abort if this happens, just dump the chunk silently. 5762 */ 5763 switch (SCTP_GET_STATE(&stcb->asoc)) { 5764 case SCTP_STATE_COOKIE_ECHOED: 5765 /* 5766 * we consider data with valid tags in this state 5767 * shows us the cookie-ack was lost. Imply it was 5768 * there. 5769 */ 5770 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net); 5771 break; 5772 case SCTP_STATE_COOKIE_WAIT: 5773 /* 5774 * We consider OOTB any data sent during asoc setup. 5775 */ 5776 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5777 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5778 msg); 5779 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5780 mflowtype, mflowid, inp->fibnum, 5781 vrf_id, port); 5782 goto out; 5783 /* sa_ignore NOTREACHED */ 5784 break; 5785 case SCTP_STATE_EMPTY: /* should not happen */ 5786 case SCTP_STATE_INUSE: /* should not happen */ 5787 case SCTP_STATE_SHUTDOWN_RECEIVED: /* This is a peer error */ 5788 case SCTP_STATE_SHUTDOWN_ACK_SENT: 5789 default: 5790 goto out; 5791 /* sa_ignore NOTREACHED */ 5792 break; 5793 case SCTP_STATE_OPEN: 5794 case SCTP_STATE_SHUTDOWN_SENT: 5795 break; 5796 } 5797 /* plow through the data chunks while length > offset */ 5798 retval = sctp_process_data(mm, iphlen, &offset, length, 5799 inp, stcb, net, &high_tsn); 5800 if (retval == 2) { 5801 /* 5802 * The association aborted, NO UNLOCK needed since 5803 * the association is destroyed. 5804 */ 5805 stcb = NULL; 5806 goto out; 5807 } 5808 data_processed = 1; 5809 /* 5810 * Anything important needs to have been m_copy'ed in 5811 * process_data 5812 */ 5813 } 5814 /* take care of ecn */ 5815 if ((data_processed == 1) && 5816 (stcb->asoc.ecn_supported == 1) && 5817 ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) { 5818 /* Yep, we need to add a ECNE */ 5819 sctp_send_ecn_echo(stcb, net, high_tsn); 5820 } 5821 if ((data_processed == 0) && (fwd_tsn_seen)) { 5822 int was_a_gap; 5823 uint32_t highest_tsn; 5824 5825 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) { 5826 highest_tsn = stcb->asoc.highest_tsn_inside_nr_map; 5827 } else { 5828 highest_tsn = stcb->asoc.highest_tsn_inside_map; 5829 } 5830 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn); 5831 stcb->asoc.send_sack = 1; 5832 sctp_sack_check(stcb, was_a_gap); 5833 } else if (fwd_tsn_seen) { 5834 stcb->asoc.send_sack = 1; 5835 } 5836 /* trigger send of any chunks in queue... */ 5837 trigger_send: 5838 #ifdef SCTP_AUDITING_ENABLED 5839 sctp_audit_log(0xE0, 2); 5840 sctp_auditing(1, inp, stcb, net); 5841 #endif 5842 SCTPDBG(SCTP_DEBUG_INPUT1, 5843 "Check for chunk output prw:%d tqe:%d tf=%d\n", 5844 stcb->asoc.peers_rwnd, 5845 TAILQ_EMPTY(&stcb->asoc.control_send_queue), 5846 stcb->asoc.total_flight); 5847 un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight); 5848 if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 5849 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq; 5850 } 5851 if (!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue) || 5852 cnt_ctrl_ready || 5853 stcb->asoc.trigger_reset || 5854 ((un_sent) && 5855 (stcb->asoc.peers_rwnd > 0 || 5856 (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) { 5857 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n"); 5858 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 5859 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n"); 5860 } 5861 #ifdef SCTP_AUDITING_ENABLED 5862 sctp_audit_log(0xE0, 3); 5863 sctp_auditing(2, inp, stcb, net); 5864 #endif 5865 out: 5866 if (stcb != NULL) { 5867 SCTP_TCB_UNLOCK(stcb); 5868 } 5869 if (inp_decr != NULL) { 5870 /* reduce ref-count */ 5871 SCTP_INP_WLOCK(inp_decr); 5872 SCTP_INP_DECR_REF(inp_decr); 5873 SCTP_INP_WUNLOCK(inp_decr); 5874 } 5875 return; 5876 } 5877 5878 #ifdef INET 5879 void 5880 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port) 5881 { 5882 struct mbuf *m; 5883 int iphlen; 5884 uint32_t vrf_id = 0; 5885 uint8_t ecn_bits; 5886 struct sockaddr_in src, dst; 5887 struct ip *ip; 5888 struct sctphdr *sh; 5889 struct sctp_chunkhdr *ch; 5890 int length, offset; 5891 uint8_t compute_crc; 5892 uint32_t mflowid; 5893 uint8_t mflowtype; 5894 uint16_t fibnum; 5895 5896 iphlen = off; 5897 if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) { 5898 SCTP_RELEASE_PKT(i_pak); 5899 return; 5900 } 5901 m = SCTP_HEADER_TO_CHAIN(i_pak); 5902 #ifdef SCTP_MBUF_LOGGING 5903 /* Log in any input mbufs */ 5904 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5905 sctp_log_mbc(m, SCTP_MBUF_INPUT); 5906 } 5907 #endif 5908 #ifdef SCTP_PACKET_LOGGING 5909 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) { 5910 sctp_packet_log(m); 5911 } 5912 #endif 5913 SCTPDBG(SCTP_DEBUG_CRCOFFLOAD, 5914 "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n", 5915 m->m_pkthdr.len, 5916 if_name(m->m_pkthdr.rcvif), 5917 (int)m->m_pkthdr.csum_flags, CSUM_BITS); 5918 mflowid = m->m_pkthdr.flowid; 5919 mflowtype = M_HASHTYPE_GET(m); 5920 fibnum = M_GETFIB(m); 5921 SCTP_STAT_INCR(sctps_recvpackets); 5922 SCTP_STAT_INCR_COUNTER64(sctps_inpackets); 5923 /* Get IP, SCTP, and first chunk header together in the first mbuf. */ 5924 offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr); 5925 if (SCTP_BUF_LEN(m) < offset) { 5926 if ((m = m_pullup(m, offset)) == NULL) { 5927 SCTP_STAT_INCR(sctps_hdrops); 5928 return; 5929 } 5930 } 5931 ip = mtod(m, struct ip *); 5932 sh = (struct sctphdr *)((caddr_t)ip + iphlen); 5933 ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr)); 5934 offset -= sizeof(struct sctp_chunkhdr); 5935 memset(&src, 0, sizeof(struct sockaddr_in)); 5936 src.sin_family = AF_INET; 5937 src.sin_len = sizeof(struct sockaddr_in); 5938 src.sin_port = sh->src_port; 5939 src.sin_addr = ip->ip_src; 5940 memset(&dst, 0, sizeof(struct sockaddr_in)); 5941 dst.sin_family = AF_INET; 5942 dst.sin_len = sizeof(struct sockaddr_in); 5943 dst.sin_port = sh->dest_port; 5944 dst.sin_addr = ip->ip_dst; 5945 length = ntohs(ip->ip_len); 5946 /* Validate mbuf chain length with IP payload length. */ 5947 if (SCTP_HEADER_LEN(m) != length) { 5948 SCTPDBG(SCTP_DEBUG_INPUT1, 5949 "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m)); 5950 SCTP_STAT_INCR(sctps_hdrops); 5951 goto out; 5952 } 5953 /* SCTP does not allow broadcasts or multicasts */ 5954 if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) { 5955 goto out; 5956 } 5957 if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) { 5958 goto out; 5959 } 5960 ecn_bits = ip->ip_tos; 5961 if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) { 5962 SCTP_STAT_INCR(sctps_recvhwcrc); 5963 compute_crc = 0; 5964 } else { 5965 SCTP_STAT_INCR(sctps_recvswcrc); 5966 compute_crc = 1; 5967 } 5968 sctp_common_input_processing(&m, iphlen, offset, length, 5969 (struct sockaddr *)&src, 5970 (struct sockaddr *)&dst, 5971 sh, ch, 5972 compute_crc, 5973 ecn_bits, 5974 mflowtype, mflowid, fibnum, 5975 vrf_id, port); 5976 out: 5977 if (m) { 5978 sctp_m_freem(m); 5979 } 5980 return; 5981 } 5982 5983 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP) 5984 extern int *sctp_cpuarry; 5985 #endif 5986 5987 int 5988 sctp_input(struct mbuf **mp, int *offp, int proto SCTP_UNUSED) 5989 { 5990 struct mbuf *m; 5991 int off; 5992 5993 m = *mp; 5994 off = *offp; 5995 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP) 5996 if (mp_ncpus > 1) { 5997 struct ip *ip; 5998 struct sctphdr *sh; 5999 int offset; 6000 int cpu_to_use; 6001 uint32_t flowid, tag; 6002 6003 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) { 6004 flowid = m->m_pkthdr.flowid; 6005 } else { 6006 /* 6007 * No flow id built by lower layers fix it so we 6008 * create one. 6009 */ 6010 offset = off + sizeof(struct sctphdr); 6011 if (SCTP_BUF_LEN(m) < offset) { 6012 if ((m = m_pullup(m, offset)) == NULL) { 6013 SCTP_STAT_INCR(sctps_hdrops); 6014 return (IPPROTO_DONE); 6015 } 6016 } 6017 ip = mtod(m, struct ip *); 6018 sh = (struct sctphdr *)((caddr_t)ip + off); 6019 tag = htonl(sh->v_tag); 6020 flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port); 6021 m->m_pkthdr.flowid = flowid; 6022 M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE_HASH); 6023 } 6024 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus]; 6025 sctp_queue_to_mcore(m, off, cpu_to_use); 6026 return (IPPROTO_DONE); 6027 } 6028 #endif 6029 sctp_input_with_port(m, off, 0); 6030 return (IPPROTO_DONE); 6031 } 6032 #endif 6033