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) == 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 } 311 SCTP_TCB_SEND_LOCK(stcb); 312 if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) { 313 unsigned int newcnt; 314 struct sctp_stream_out *outs; 315 struct sctp_stream_queue_pending *sp, *nsp; 316 struct sctp_tmit_chunk *chk, *nchk; 317 318 /* abandon the upper streams */ 319 newcnt = ntohs(init->num_inbound_streams); 320 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) { 321 if (chk->rec.data.sid >= newcnt) { 322 TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next); 323 asoc->send_queue_cnt--; 324 if (asoc->strmout[chk->rec.data.sid].chunks_on_queues > 0) { 325 asoc->strmout[chk->rec.data.sid].chunks_on_queues--; 326 #ifdef INVARIANTS 327 } else { 328 panic("No chunks on the queues for sid %u.", chk->rec.data.sid); 329 #endif 330 } 331 if (chk->data != NULL) { 332 sctp_free_bufspace(stcb, asoc, chk, 1); 333 sctp_ulp_notify(SCTP_NOTIFY_UNSENT_DG_FAIL, stcb, 334 0, chk, SCTP_SO_NOT_LOCKED); 335 if (chk->data) { 336 sctp_m_freem(chk->data); 337 chk->data = NULL; 338 } 339 } 340 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 341 /* sa_ignore FREED_MEMORY */ 342 } 343 } 344 if (asoc->strmout) { 345 for (i = newcnt; i < asoc->pre_open_streams; i++) { 346 outs = &asoc->strmout[i]; 347 TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) { 348 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1); 349 TAILQ_REMOVE(&outs->outqueue, sp, next); 350 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, outs, sp, 1); 351 sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL, 352 stcb, 0, sp, SCTP_SO_NOT_LOCKED); 353 if (sp->data) { 354 sctp_m_freem(sp->data); 355 sp->data = NULL; 356 } 357 if (sp->net) { 358 sctp_free_remote_addr(sp->net); 359 sp->net = NULL; 360 } 361 /* Free the chunk */ 362 sctp_free_a_strmoq(stcb, sp, SCTP_SO_NOT_LOCKED); 363 /* sa_ignore FREED_MEMORY */ 364 } 365 outs->state = SCTP_STREAM_CLOSED; 366 } 367 } 368 /* cut back the count */ 369 asoc->pre_open_streams = newcnt; 370 } 371 SCTP_TCB_SEND_UNLOCK(stcb); 372 asoc->streamoutcnt = asoc->pre_open_streams; 373 if (asoc->strmout) { 374 for (i = 0; i < asoc->streamoutcnt; i++) { 375 asoc->strmout[i].state = SCTP_STREAM_OPEN; 376 } 377 } 378 /* EY - nr_sack: initialize highest tsn in nr_mapping_array */ 379 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 380 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 381 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 382 } 383 /* This is the next one we expect */ 384 asoc->str_reset_seq_in = asoc->asconf_seq_in + 1; 385 386 asoc->mapping_array_base_tsn = ntohl(init->initial_tsn); 387 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in; 388 389 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 390 /* open the requested streams */ 391 392 if (asoc->strmin != NULL) { 393 /* Free the old ones */ 394 for (i = 0; i < asoc->streamincnt; i++) { 395 sctp_clean_up_stream(stcb, &asoc->strmin[i].inqueue); 396 sctp_clean_up_stream(stcb, &asoc->strmin[i].uno_inqueue); 397 } 398 SCTP_FREE(asoc->strmin, SCTP_M_STRMI); 399 } 400 if (asoc->max_inbound_streams > ntohs(init->num_outbound_streams)) { 401 asoc->streamincnt = ntohs(init->num_outbound_streams); 402 } else { 403 asoc->streamincnt = asoc->max_inbound_streams; 404 } 405 SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt * 406 sizeof(struct sctp_stream_in), SCTP_M_STRMI); 407 if (asoc->strmin == NULL) { 408 /* we didn't get memory for the streams! */ 409 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n"); 410 return (-1); 411 } 412 for (i = 0; i < asoc->streamincnt; i++) { 413 asoc->strmin[i].sid = i; 414 asoc->strmin[i].last_mid_delivered = 0xffffffff; 415 TAILQ_INIT(&asoc->strmin[i].inqueue); 416 TAILQ_INIT(&asoc->strmin[i].uno_inqueue); 417 asoc->strmin[i].pd_api_started = 0; 418 asoc->strmin[i].delivery_started = 0; 419 } 420 /* 421 * load_address_from_init will put the addresses into the 422 * association when the COOKIE is processed or the INIT-ACK is 423 * processed. Both types of COOKIE's existing and new call this 424 * routine. It will remove addresses that are no longer in the 425 * association (for the restarting case where addresses are 426 * removed). Up front when the INIT arrives we will discard it if it 427 * is a restart and new addresses have been added. 428 */ 429 /* sa_ignore MEMLEAK */ 430 return (0); 431 } 432 433 /* 434 * INIT-ACK message processing/consumption returns value < 0 on error 435 */ 436 static int 437 sctp_process_init_ack(struct mbuf *m, int iphlen, int offset, 438 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 439 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 440 struct sctp_nets *net, int *abort_no_unlock, 441 uint8_t mflowtype, uint32_t mflowid, 442 uint32_t vrf_id) 443 { 444 struct sctp_association *asoc; 445 struct mbuf *op_err; 446 int retval, abort_flag; 447 uint32_t initack_limit; 448 int nat_friendly = 0; 449 450 /* First verify that we have no illegal param's */ 451 abort_flag = 0; 452 453 op_err = sctp_arethere_unrecognized_parameters(m, 454 (offset + sizeof(struct sctp_init_chunk)), 455 &abort_flag, (struct sctp_chunkhdr *)cp, &nat_friendly); 456 if (abort_flag) { 457 /* Send an abort and notify peer */ 458 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 459 *abort_no_unlock = 1; 460 return (-1); 461 } 462 asoc = &stcb->asoc; 463 asoc->peer_supports_nat = (uint8_t)nat_friendly; 464 /* process the peer's parameters in the INIT-ACK */ 465 retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb); 466 if (retval < 0) { 467 return (retval); 468 } 469 initack_limit = offset + ntohs(cp->ch.chunk_length); 470 /* load all addresses */ 471 if ((retval = sctp_load_addresses_from_init(stcb, m, 472 (offset + sizeof(struct sctp_init_chunk)), initack_limit, 473 src, dst, NULL, stcb->asoc.port))) { 474 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 475 "Problem with address parameters"); 476 SCTPDBG(SCTP_DEBUG_INPUT1, 477 "Load addresses from INIT causes an abort %d\n", 478 retval); 479 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 480 src, dst, sh, op_err, 481 mflowtype, mflowid, 482 vrf_id, net->port); 483 *abort_no_unlock = 1; 484 return (-1); 485 } 486 /* if the peer doesn't support asconf, flush the asconf queue */ 487 if (asoc->asconf_supported == 0) { 488 struct sctp_asconf_addr *param, *nparam; 489 490 TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) { 491 TAILQ_REMOVE(&asoc->asconf_queue, param, next); 492 SCTP_FREE(param, SCTP_M_ASC_ADDR); 493 } 494 } 495 496 stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs, 497 stcb->asoc.local_hmacs); 498 if (op_err) { 499 sctp_queue_op_err(stcb, op_err); 500 /* queuing will steal away the mbuf chain to the out queue */ 501 op_err = NULL; 502 } 503 /* extract the cookie and queue it to "echo" it back... */ 504 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 505 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 506 stcb->asoc.overall_error_count, 507 0, 508 SCTP_FROM_SCTP_INPUT, 509 __LINE__); 510 } 511 stcb->asoc.overall_error_count = 0; 512 net->error_count = 0; 513 514 /* 515 * Cancel the INIT timer, We do this first before queueing the 516 * cookie. We always cancel at the primary to assue that we are 517 * canceling the timer started by the INIT which always goes to the 518 * primary. 519 */ 520 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb, 521 asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3); 522 523 /* calculate the RTO */ 524 net->RTO = sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, 525 SCTP_RTT_FROM_NON_DATA); 526 retval = sctp_send_cookie_echo(m, offset, stcb, net); 527 if (retval < 0) { 528 /* 529 * No cookie, we probably should send a op error. But in any 530 * case if there is no cookie in the INIT-ACK, we can 531 * abandon the peer, its broke. 532 */ 533 if (retval == -3) { 534 uint16_t len; 535 536 len = (uint16_t)(sizeof(struct sctp_error_missing_param) + sizeof(uint16_t)); 537 /* We abort with an error of missing mandatory param */ 538 op_err = sctp_get_mbuf_for_msg(len, 0, M_NOWAIT, 1, MT_DATA); 539 if (op_err != NULL) { 540 struct sctp_error_missing_param *cause; 541 542 SCTP_BUF_LEN(op_err) = len; 543 cause = mtod(op_err, struct sctp_error_missing_param *); 544 /* Subtract the reserved param */ 545 cause->cause.code = htons(SCTP_CAUSE_MISSING_PARAM); 546 cause->cause.length = htons(len); 547 cause->num_missing_params = htonl(1); 548 cause->type[0] = htons(SCTP_STATE_COOKIE); 549 } 550 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 551 src, dst, sh, op_err, 552 mflowtype, mflowid, 553 vrf_id, net->port); 554 *abort_no_unlock = 1; 555 } 556 return (retval); 557 } 558 559 return (0); 560 } 561 562 static void 563 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp, 564 struct sctp_tcb *stcb, struct sctp_nets *net) 565 { 566 union sctp_sockstore store; 567 struct sctp_nets *r_net, *f_net; 568 struct timeval tv; 569 int req_prim = 0; 570 uint16_t old_error_counter; 571 572 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) { 573 /* Invalid length */ 574 return; 575 } 576 577 memset(&store, 0, sizeof(store)); 578 switch (cp->heartbeat.hb_info.addr_family) { 579 #ifdef INET 580 case AF_INET: 581 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) { 582 store.sin.sin_family = cp->heartbeat.hb_info.addr_family; 583 store.sin.sin_len = cp->heartbeat.hb_info.addr_len; 584 store.sin.sin_port = stcb->rport; 585 memcpy(&store.sin.sin_addr, cp->heartbeat.hb_info.address, 586 sizeof(store.sin.sin_addr)); 587 } else { 588 return; 589 } 590 break; 591 #endif 592 #ifdef INET6 593 case AF_INET6: 594 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) { 595 store.sin6.sin6_family = cp->heartbeat.hb_info.addr_family; 596 store.sin6.sin6_len = cp->heartbeat.hb_info.addr_len; 597 store.sin6.sin6_port = stcb->rport; 598 memcpy(&store.sin6.sin6_addr, cp->heartbeat.hb_info.address, sizeof(struct in6_addr)); 599 } else { 600 return; 601 } 602 break; 603 #endif 604 default: 605 return; 606 } 607 r_net = sctp_findnet(stcb, &store.sa); 608 if (r_net == NULL) { 609 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n"); 610 return; 611 } 612 if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) && 613 (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) && 614 (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) { 615 /* 616 * If the its a HB and it's random value is correct when can 617 * confirm the destination. 618 */ 619 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 620 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) { 621 stcb->asoc.primary_destination = r_net; 622 r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY; 623 f_net = TAILQ_FIRST(&stcb->asoc.nets); 624 if (f_net != r_net) { 625 /* 626 * first one on the list is NOT the primary 627 * sctp_cmpaddr() is much more efficient if 628 * the primary is the first on the list, 629 * make it so. 630 */ 631 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next); 632 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next); 633 } 634 req_prim = 1; 635 } 636 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 637 stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 638 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, 639 r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4); 640 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 641 } 642 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 643 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 644 stcb->asoc.overall_error_count, 645 0, 646 SCTP_FROM_SCTP_INPUT, 647 __LINE__); 648 } 649 stcb->asoc.overall_error_count = 0; 650 old_error_counter = r_net->error_count; 651 r_net->error_count = 0; 652 r_net->hb_responded = 1; 653 tv.tv_sec = cp->heartbeat.hb_info.time_value_1; 654 tv.tv_usec = cp->heartbeat.hb_info.time_value_2; 655 /* Now lets do a RTO with this */ 656 r_net->RTO = sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, 657 SCTP_RTT_FROM_NON_DATA); 658 if (!(r_net->dest_state & SCTP_ADDR_REACHABLE)) { 659 r_net->dest_state |= SCTP_ADDR_REACHABLE; 660 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb, 661 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 662 } 663 if (r_net->dest_state & SCTP_ADDR_PF) { 664 r_net->dest_state &= ~SCTP_ADDR_PF; 665 stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net); 666 } 667 if (old_error_counter > 0) { 668 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 669 stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_5); 670 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 671 } 672 if (r_net == stcb->asoc.primary_destination) { 673 if (stcb->asoc.alternate) { 674 /* release the alternate, primary is good */ 675 sctp_free_remote_addr(stcb->asoc.alternate); 676 stcb->asoc.alternate = NULL; 677 } 678 } 679 /* Mobility adaptation */ 680 if (req_prim) { 681 if ((sctp_is_mobility_feature_on(stcb->sctp_ep, 682 SCTP_MOBILITY_BASE) || 683 sctp_is_mobility_feature_on(stcb->sctp_ep, 684 SCTP_MOBILITY_FASTHANDOFF)) && 685 sctp_is_mobility_feature_on(stcb->sctp_ep, 686 SCTP_MOBILITY_PRIM_DELETED)) { 687 688 sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED, 689 stcb->sctp_ep, stcb, NULL, 690 SCTP_FROM_SCTP_INPUT + SCTP_LOC_6); 691 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 692 SCTP_MOBILITY_FASTHANDOFF)) { 693 sctp_assoc_immediate_retrans(stcb, 694 stcb->asoc.primary_destination); 695 } 696 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 697 SCTP_MOBILITY_BASE)) { 698 sctp_move_chunks_from_net(stcb, 699 stcb->asoc.deleted_primary); 700 } 701 sctp_delete_prim_timer(stcb->sctp_ep, stcb, 702 stcb->asoc.deleted_primary); 703 } 704 } 705 } 706 707 static int 708 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb) 709 { 710 /* 711 * return 0 means we want you to proceed with the abort non-zero 712 * means no abort processing 713 */ 714 struct sctpasochead *head; 715 716 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || 717 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 718 atomic_add_int(&stcb->asoc.refcnt, 1); 719 SCTP_TCB_UNLOCK(stcb); 720 SCTP_INP_INFO_WLOCK(); 721 SCTP_TCB_LOCK(stcb); 722 atomic_subtract_int(&stcb->asoc.refcnt, 1); 723 } 724 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) { 725 /* generate a new vtag and send init */ 726 LIST_REMOVE(stcb, sctp_asocs); 727 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 728 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 729 /* 730 * put it in the bucket in the vtag hash of assoc's for the 731 * system 732 */ 733 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 734 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 735 SCTP_INP_INFO_WUNLOCK(); 736 return (1); 737 } 738 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) { 739 /* 740 * treat like a case where the cookie expired i.e.: - dump 741 * current cookie. - generate a new vtag. - resend init. 742 */ 743 /* generate a new vtag and send init */ 744 LIST_REMOVE(stcb, sctp_asocs); 745 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT); 746 sctp_stop_all_cookie_timers(stcb); 747 sctp_toss_old_cookies(stcb, &stcb->asoc); 748 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 749 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 750 /* 751 * put it in the bucket in the vtag hash of assoc's for the 752 * system 753 */ 754 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 755 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 756 SCTP_INP_INFO_WUNLOCK(); 757 return (1); 758 } 759 return (0); 760 } 761 762 static int 763 sctp_handle_nat_missing_state(struct sctp_tcb *stcb, 764 struct sctp_nets *net) 765 { 766 /* 767 * return 0 means we want you to proceed with the abort non-zero 768 * means no abort processing 769 */ 770 if (stcb->asoc.auth_supported == 0) { 771 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n"); 772 return (0); 773 } 774 sctp_asconf_send_nat_state_update(stcb, net); 775 return (1); 776 } 777 778 779 /* Returns 1 if the stcb was aborted, 0 otherwise */ 780 static int 781 sctp_handle_abort(struct sctp_abort_chunk *abort, 782 struct sctp_tcb *stcb, struct sctp_nets *net) 783 { 784 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 785 struct socket *so; 786 #endif 787 uint16_t len; 788 uint16_t error; 789 790 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n"); 791 if (stcb == NULL) 792 return (0); 793 794 len = ntohs(abort->ch.chunk_length); 795 if (len >= sizeof(struct sctp_chunkhdr) + sizeof(struct sctp_error_cause)) { 796 /* 797 * Need to check the cause codes for our two magic nat 798 * aborts which don't kill the assoc necessarily. 799 */ 800 struct sctp_error_cause *cause; 801 802 cause = (struct sctp_error_cause *)(abort + 1); 803 error = ntohs(cause->code); 804 if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) { 805 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n", 806 abort->ch.chunk_flags); 807 if (sctp_handle_nat_colliding_state(stcb)) { 808 return (0); 809 } 810 } else if (error == SCTP_CAUSE_NAT_MISSING_STATE) { 811 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n", 812 abort->ch.chunk_flags); 813 if (sctp_handle_nat_missing_state(stcb, net)) { 814 return (0); 815 } 816 } 817 } else { 818 error = 0; 819 } 820 /* stop any receive timers */ 821 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net, 822 SCTP_FROM_SCTP_INPUT + SCTP_LOC_7); 823 /* notify user of the abort and clean up... */ 824 sctp_abort_notification(stcb, 1, error, abort, SCTP_SO_NOT_LOCKED); 825 /* free the tcb */ 826 SCTP_STAT_INCR_COUNTER32(sctps_aborted); 827 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) || 828 (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 829 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 830 } 831 #ifdef SCTP_ASOCLOG_OF_TSNS 832 sctp_print_out_track_log(stcb); 833 #endif 834 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 835 so = SCTP_INP_SO(stcb->sctp_ep); 836 atomic_add_int(&stcb->asoc.refcnt, 1); 837 SCTP_TCB_UNLOCK(stcb); 838 SCTP_SOCKET_LOCK(so, 1); 839 SCTP_TCB_LOCK(stcb); 840 atomic_subtract_int(&stcb->asoc.refcnt, 1); 841 #endif 842 SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_WAS_ABORTED); 843 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 844 SCTP_FROM_SCTP_INPUT + SCTP_LOC_8); 845 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 846 SCTP_SOCKET_UNLOCK(so, 1); 847 #endif 848 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n"); 849 return (1); 850 } 851 852 static void 853 sctp_start_net_timers(struct sctp_tcb *stcb) 854 { 855 uint32_t cnt_hb_sent; 856 struct sctp_nets *net; 857 858 cnt_hb_sent = 0; 859 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 860 /* 861 * For each network start: 1) A pmtu timer. 2) A HB timer 3) 862 * If the dest in unconfirmed send a hb as well if under 863 * max_hb_burst have been sent. 864 */ 865 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net); 866 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net); 867 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) && 868 (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) { 869 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 870 cnt_hb_sent++; 871 } 872 } 873 if (cnt_hb_sent) { 874 sctp_chunk_output(stcb->sctp_ep, stcb, 875 SCTP_OUTPUT_FROM_COOKIE_ACK, 876 SCTP_SO_NOT_LOCKED); 877 } 878 } 879 880 881 static void 882 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp, 883 struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag) 884 { 885 struct sctp_association *asoc; 886 int some_on_streamwheel; 887 int old_state; 888 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 889 struct socket *so; 890 #endif 891 892 SCTPDBG(SCTP_DEBUG_INPUT2, 893 "sctp_handle_shutdown: handling SHUTDOWN\n"); 894 if (stcb == NULL) 895 return; 896 asoc = &stcb->asoc; 897 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || 898 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 899 return; 900 } 901 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) { 902 /* Shutdown NOT the expected size */ 903 return; 904 } 905 old_state = SCTP_GET_STATE(stcb); 906 sctp_update_acked(stcb, cp, abort_flag); 907 if (*abort_flag) { 908 return; 909 } 910 if (asoc->control_pdapi) { 911 /* 912 * With a normal shutdown we assume the end of last record. 913 */ 914 SCTP_INP_READ_LOCK(stcb->sctp_ep); 915 if (asoc->control_pdapi->on_strm_q) { 916 struct sctp_stream_in *strm; 917 918 strm = &asoc->strmin[asoc->control_pdapi->sinfo_stream]; 919 if (asoc->control_pdapi->on_strm_q == SCTP_ON_UNORDERED) { 920 /* Unordered */ 921 TAILQ_REMOVE(&strm->uno_inqueue, asoc->control_pdapi, next_instrm); 922 asoc->control_pdapi->on_strm_q = 0; 923 } else if (asoc->control_pdapi->on_strm_q == SCTP_ON_ORDERED) { 924 /* Ordered */ 925 TAILQ_REMOVE(&strm->inqueue, asoc->control_pdapi, next_instrm); 926 asoc->control_pdapi->on_strm_q = 0; 927 #ifdef INVARIANTS 928 } else { 929 panic("Unknown state on ctrl:%p on_strm_q:%d", 930 asoc->control_pdapi, 931 asoc->control_pdapi->on_strm_q); 932 #endif 933 } 934 } 935 asoc->control_pdapi->end_added = 1; 936 asoc->control_pdapi->pdapi_aborted = 1; 937 asoc->control_pdapi = NULL; 938 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 939 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 940 so = SCTP_INP_SO(stcb->sctp_ep); 941 atomic_add_int(&stcb->asoc.refcnt, 1); 942 SCTP_TCB_UNLOCK(stcb); 943 SCTP_SOCKET_LOCK(so, 1); 944 SCTP_TCB_LOCK(stcb); 945 atomic_subtract_int(&stcb->asoc.refcnt, 1); 946 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 947 /* assoc was freed while we were unlocked */ 948 SCTP_SOCKET_UNLOCK(so, 1); 949 return; 950 } 951 #endif 952 if (stcb->sctp_socket) { 953 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 954 } 955 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 956 SCTP_SOCKET_UNLOCK(so, 1); 957 #endif 958 } 959 /* goto SHUTDOWN_RECEIVED state to block new requests */ 960 if (stcb->sctp_socket) { 961 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) && 962 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) && 963 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT)) { 964 SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_RECEIVED); 965 SCTP_CLEAR_SUBSTATE(stcb, SCTP_STATE_SHUTDOWN_PENDING); 966 /* 967 * notify upper layer that peer has initiated a 968 * shutdown 969 */ 970 sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 971 972 /* reset time */ 973 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 974 } 975 } 976 if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) { 977 /* 978 * stop the shutdown timer, since we WILL move to 979 * SHUTDOWN-ACK-SENT. 980 */ 981 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, 982 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9); 983 } 984 /* Now is there unsent data on a stream somewhere? */ 985 some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED); 986 987 if (!TAILQ_EMPTY(&asoc->send_queue) || 988 !TAILQ_EMPTY(&asoc->sent_queue) || 989 some_on_streamwheel) { 990 /* By returning we will push more data out */ 991 return; 992 } else { 993 /* no outstanding data to send, so move on... */ 994 /* send SHUTDOWN-ACK */ 995 /* move to SHUTDOWN-ACK-SENT state */ 996 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) || 997 (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 998 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 999 } 1000 SCTP_CLEAR_SUBSTATE(stcb, SCTP_STATE_SHUTDOWN_PENDING); 1001 if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 1002 SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_ACK_SENT); 1003 sctp_stop_timers_for_shutdown(stcb); 1004 sctp_send_shutdown_ack(stcb, net); 1005 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, 1006 stcb->sctp_ep, stcb, net); 1007 } else if (old_state == SCTP_STATE_SHUTDOWN_ACK_SENT) { 1008 sctp_send_shutdown_ack(stcb, net); 1009 } 1010 } 1011 } 1012 1013 static void 1014 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED, 1015 struct sctp_tcb *stcb, 1016 struct sctp_nets *net) 1017 { 1018 struct sctp_association *asoc; 1019 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1020 struct socket *so; 1021 1022 so = SCTP_INP_SO(stcb->sctp_ep); 1023 #endif 1024 SCTPDBG(SCTP_DEBUG_INPUT2, 1025 "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n"); 1026 if (stcb == NULL) 1027 return; 1028 1029 asoc = &stcb->asoc; 1030 /* process according to association state */ 1031 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || 1032 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 1033 /* unexpected SHUTDOWN-ACK... do OOTB handling... */ 1034 sctp_send_shutdown_complete(stcb, net, 1); 1035 SCTP_TCB_UNLOCK(stcb); 1036 return; 1037 } 1038 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) && 1039 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) { 1040 /* unexpected SHUTDOWN-ACK... so ignore... */ 1041 SCTP_TCB_UNLOCK(stcb); 1042 return; 1043 } 1044 if (asoc->control_pdapi) { 1045 /* 1046 * With a normal shutdown we assume the end of last record. 1047 */ 1048 SCTP_INP_READ_LOCK(stcb->sctp_ep); 1049 asoc->control_pdapi->end_added = 1; 1050 asoc->control_pdapi->pdapi_aborted = 1; 1051 asoc->control_pdapi = NULL; 1052 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 1053 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1054 atomic_add_int(&stcb->asoc.refcnt, 1); 1055 SCTP_TCB_UNLOCK(stcb); 1056 SCTP_SOCKET_LOCK(so, 1); 1057 SCTP_TCB_LOCK(stcb); 1058 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1059 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1060 /* assoc was freed while we were unlocked */ 1061 SCTP_SOCKET_UNLOCK(so, 1); 1062 return; 1063 } 1064 #endif 1065 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 1066 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1067 SCTP_SOCKET_UNLOCK(so, 1); 1068 #endif 1069 } 1070 #ifdef INVARIANTS 1071 if (!TAILQ_EMPTY(&asoc->send_queue) || 1072 !TAILQ_EMPTY(&asoc->sent_queue) || 1073 sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) { 1074 panic("Queues are not empty when handling SHUTDOWN-ACK"); 1075 } 1076 #endif 1077 /* stop the timer */ 1078 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, 1079 SCTP_FROM_SCTP_INPUT + SCTP_LOC_10); 1080 /* send SHUTDOWN-COMPLETE */ 1081 sctp_send_shutdown_complete(stcb, net, 0); 1082 /* notify upper layer protocol */ 1083 if (stcb->sctp_socket) { 1084 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1085 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 1086 stcb->sctp_socket->so_snd.sb_cc = 0; 1087 } 1088 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 1089 } 1090 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 1091 /* free the TCB but first save off the ep */ 1092 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1093 atomic_add_int(&stcb->asoc.refcnt, 1); 1094 SCTP_TCB_UNLOCK(stcb); 1095 SCTP_SOCKET_LOCK(so, 1); 1096 SCTP_TCB_LOCK(stcb); 1097 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1098 #endif 1099 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1100 SCTP_FROM_SCTP_INPUT + SCTP_LOC_11); 1101 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1102 SCTP_SOCKET_UNLOCK(so, 1); 1103 #endif 1104 } 1105 1106 static void 1107 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, uint8_t chunk_type, 1108 struct sctp_nets *net) 1109 { 1110 switch (chunk_type) { 1111 case SCTP_ASCONF_ACK: 1112 case SCTP_ASCONF: 1113 sctp_asconf_cleanup(stcb, net); 1114 break; 1115 case SCTP_IFORWARD_CUM_TSN: 1116 case SCTP_FORWARD_CUM_TSN: 1117 stcb->asoc.prsctp_supported = 0; 1118 break; 1119 default: 1120 SCTPDBG(SCTP_DEBUG_INPUT2, 1121 "Peer does not support chunk type %d (0x%x).\n", 1122 chunk_type, chunk_type); 1123 break; 1124 } 1125 } 1126 1127 /* 1128 * Skip past the param header and then we will find the param that caused the 1129 * problem. There are a number of param's in a ASCONF OR the prsctp param 1130 * these will turn of specific features. 1131 * XXX: Is this the right thing to do? 1132 */ 1133 static void 1134 sctp_process_unrecog_param(struct sctp_tcb *stcb, uint16_t parameter_type) 1135 { 1136 switch (parameter_type) { 1137 /* pr-sctp draft */ 1138 case SCTP_PRSCTP_SUPPORTED: 1139 stcb->asoc.prsctp_supported = 0; 1140 break; 1141 case SCTP_SUPPORTED_CHUNK_EXT: 1142 break; 1143 /* draft-ietf-tsvwg-addip-sctp */ 1144 case SCTP_HAS_NAT_SUPPORT: 1145 stcb->asoc.peer_supports_nat = 0; 1146 break; 1147 case SCTP_ADD_IP_ADDRESS: 1148 case SCTP_DEL_IP_ADDRESS: 1149 case SCTP_SET_PRIM_ADDR: 1150 stcb->asoc.asconf_supported = 0; 1151 break; 1152 case SCTP_SUCCESS_REPORT: 1153 case SCTP_ERROR_CAUSE_IND: 1154 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n"); 1155 SCTPDBG(SCTP_DEBUG_INPUT2, 1156 "Turning off ASCONF to this strange peer\n"); 1157 stcb->asoc.asconf_supported = 0; 1158 break; 1159 default: 1160 SCTPDBG(SCTP_DEBUG_INPUT2, 1161 "Peer does not support param type %d (0x%x)??\n", 1162 parameter_type, parameter_type); 1163 break; 1164 } 1165 } 1166 1167 static int 1168 sctp_handle_error(struct sctp_chunkhdr *ch, 1169 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 1170 { 1171 struct sctp_error_cause *cause; 1172 struct sctp_association *asoc; 1173 uint32_t remaining_length, adjust; 1174 uint16_t code, cause_code, cause_length; 1175 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1176 struct socket *so; 1177 #endif 1178 1179 /* parse through all of the errors and process */ 1180 asoc = &stcb->asoc; 1181 cause = (struct sctp_error_cause *)((caddr_t)ch + 1182 sizeof(struct sctp_chunkhdr)); 1183 remaining_length = ntohs(ch->chunk_length); 1184 if (remaining_length > limit) { 1185 remaining_length = limit; 1186 } 1187 if (remaining_length >= sizeof(struct sctp_chunkhdr)) { 1188 remaining_length -= sizeof(struct sctp_chunkhdr); 1189 } else { 1190 remaining_length = 0; 1191 } 1192 code = 0; 1193 while (remaining_length >= sizeof(struct sctp_error_cause)) { 1194 /* Process an Error Cause */ 1195 cause_code = ntohs(cause->code); 1196 cause_length = ntohs(cause->length); 1197 if ((cause_length > remaining_length) || (cause_length == 0)) { 1198 /* Invalid cause length, possibly due to truncation. */ 1199 SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in cause - bytes left: %u cause length: %u\n", 1200 remaining_length, cause_length); 1201 return (0); 1202 } 1203 if (code == 0) { 1204 /* report the first error cause */ 1205 code = cause_code; 1206 } 1207 switch (cause_code) { 1208 case SCTP_CAUSE_INVALID_STREAM: 1209 case SCTP_CAUSE_MISSING_PARAM: 1210 case SCTP_CAUSE_INVALID_PARAM: 1211 case SCTP_CAUSE_NO_USER_DATA: 1212 SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %u back? We have a bug :/ (or do they?)\n", 1213 cause_code); 1214 break; 1215 case SCTP_CAUSE_NAT_COLLIDING_STATE: 1216 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags: %x\n", 1217 ch->chunk_flags); 1218 if (sctp_handle_nat_colliding_state(stcb)) { 1219 return (0); 1220 } 1221 break; 1222 case SCTP_CAUSE_NAT_MISSING_STATE: 1223 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags: %x\n", 1224 ch->chunk_flags); 1225 if (sctp_handle_nat_missing_state(stcb, net)) { 1226 return (0); 1227 } 1228 break; 1229 case SCTP_CAUSE_STALE_COOKIE: 1230 /* 1231 * We only act if we have echoed a cookie and are 1232 * waiting. 1233 */ 1234 if ((cause_length >= sizeof(struct sctp_error_stale_cookie)) && 1235 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 1236 struct sctp_error_stale_cookie *stale_cookie; 1237 1238 stale_cookie = (struct sctp_error_stale_cookie *)cause; 1239 asoc->cookie_preserve_req = ntohl(stale_cookie->stale_time); 1240 /* Double it to be more robust on RTX */ 1241 if (asoc->cookie_preserve_req <= UINT32_MAX / 2) { 1242 asoc->cookie_preserve_req *= 2; 1243 } else { 1244 asoc->cookie_preserve_req = UINT32_MAX; 1245 } 1246 asoc->stale_cookie_count++; 1247 if (asoc->stale_cookie_count > 1248 asoc->max_init_times) { 1249 sctp_abort_notification(stcb, 0, 0, NULL, SCTP_SO_NOT_LOCKED); 1250 /* now free the asoc */ 1251 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1252 so = SCTP_INP_SO(stcb->sctp_ep); 1253 atomic_add_int(&stcb->asoc.refcnt, 1); 1254 SCTP_TCB_UNLOCK(stcb); 1255 SCTP_SOCKET_LOCK(so, 1); 1256 SCTP_TCB_LOCK(stcb); 1257 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1258 #endif 1259 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1260 SCTP_FROM_SCTP_INPUT + SCTP_LOC_12); 1261 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1262 SCTP_SOCKET_UNLOCK(so, 1); 1263 #endif 1264 return (-1); 1265 } 1266 /* blast back to INIT state */ 1267 sctp_toss_old_cookies(stcb, &stcb->asoc); 1268 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT); 1269 sctp_stop_all_cookie_timers(stcb); 1270 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 1271 } 1272 break; 1273 case SCTP_CAUSE_UNRESOLVABLE_ADDR: 1274 /* 1275 * Nothing we can do here, we don't do hostname 1276 * addresses so if the peer does not like my IPv6 1277 * (or IPv4 for that matter) it does not matter. If 1278 * they don't support that type of address, they can 1279 * NOT possibly get that packet type... i.e. with no 1280 * IPv6 you can't receive a IPv6 packet. so we can 1281 * safely ignore this one. If we ever added support 1282 * for HOSTNAME Addresses, then we would need to do 1283 * something here. 1284 */ 1285 break; 1286 case SCTP_CAUSE_UNRECOG_CHUNK: 1287 if (cause_length >= sizeof(struct sctp_error_unrecognized_chunk)) { 1288 struct sctp_error_unrecognized_chunk *unrec_chunk; 1289 1290 unrec_chunk = (struct sctp_error_unrecognized_chunk *)cause; 1291 sctp_process_unrecog_chunk(stcb, unrec_chunk->ch.chunk_type, net); 1292 } 1293 break; 1294 case SCTP_CAUSE_UNRECOG_PARAM: 1295 /* XXX: We only consider the first parameter */ 1296 if (cause_length >= sizeof(struct sctp_error_cause) + sizeof(struct sctp_paramhdr)) { 1297 struct sctp_paramhdr *unrec_parameter; 1298 1299 unrec_parameter = (struct sctp_paramhdr *)(cause + 1); 1300 sctp_process_unrecog_param(stcb, ntohs(unrec_parameter->param_type)); 1301 } 1302 break; 1303 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN: 1304 /* 1305 * We ignore this since the timer will drive out a 1306 * new cookie anyway and there timer will drive us 1307 * to send a SHUTDOWN_COMPLETE. We can't send one 1308 * here since we don't have their tag. 1309 */ 1310 break; 1311 case SCTP_CAUSE_DELETING_LAST_ADDR: 1312 case SCTP_CAUSE_RESOURCE_SHORTAGE: 1313 case SCTP_CAUSE_DELETING_SRC_ADDR: 1314 /* 1315 * We should NOT get these here, but in a 1316 * ASCONF-ACK. 1317 */ 1318 SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a error cause with code %u.\n", 1319 cause_code); 1320 break; 1321 case SCTP_CAUSE_OUT_OF_RESC: 1322 /* 1323 * And what, pray tell do we do with the fact that 1324 * the peer is out of resources? Not really sure we 1325 * could do anything but abort. I suspect this 1326 * should have came WITH an abort instead of in a 1327 * OP-ERROR. 1328 */ 1329 break; 1330 default: 1331 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown code 0x%x\n", 1332 cause_code); 1333 break; 1334 } 1335 adjust = SCTP_SIZE32(cause_length); 1336 if (remaining_length >= adjust) { 1337 remaining_length -= adjust; 1338 } else { 1339 remaining_length = 0; 1340 } 1341 cause = (struct sctp_error_cause *)((caddr_t)cause + adjust); 1342 } 1343 sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, code, ch, SCTP_SO_NOT_LOCKED); 1344 return (0); 1345 } 1346 1347 static int 1348 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset, 1349 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 1350 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 1351 struct sctp_nets *net, int *abort_no_unlock, 1352 uint8_t mflowtype, uint32_t mflowid, 1353 uint32_t vrf_id) 1354 { 1355 struct sctp_init_ack *init_ack; 1356 struct mbuf *op_err; 1357 1358 SCTPDBG(SCTP_DEBUG_INPUT2, 1359 "sctp_handle_init_ack: handling INIT-ACK\n"); 1360 1361 if (stcb == NULL) { 1362 SCTPDBG(SCTP_DEBUG_INPUT2, 1363 "sctp_handle_init_ack: TCB is null\n"); 1364 return (-1); 1365 } 1366 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) { 1367 /* Invalid length */ 1368 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1369 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1370 src, dst, sh, op_err, 1371 mflowtype, mflowid, 1372 vrf_id, net->port); 1373 *abort_no_unlock = 1; 1374 return (-1); 1375 } 1376 init_ack = &cp->init; 1377 /* validate parameters */ 1378 if (init_ack->initiate_tag == 0) { 1379 /* protocol error... send an abort */ 1380 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1381 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1382 src, dst, sh, op_err, 1383 mflowtype, mflowid, 1384 vrf_id, net->port); 1385 *abort_no_unlock = 1; 1386 return (-1); 1387 } 1388 if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) { 1389 /* protocol error... send an abort */ 1390 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1391 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1392 src, dst, sh, op_err, 1393 mflowtype, mflowid, 1394 vrf_id, net->port); 1395 *abort_no_unlock = 1; 1396 return (-1); 1397 } 1398 if (init_ack->num_inbound_streams == 0) { 1399 /* protocol error... send an abort */ 1400 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1401 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1402 src, dst, sh, op_err, 1403 mflowtype, mflowid, 1404 vrf_id, net->port); 1405 *abort_no_unlock = 1; 1406 return (-1); 1407 } 1408 if (init_ack->num_outbound_streams == 0) { 1409 /* protocol error... send an abort */ 1410 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1411 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1412 src, dst, sh, op_err, 1413 mflowtype, mflowid, 1414 vrf_id, net->port); 1415 *abort_no_unlock = 1; 1416 return (-1); 1417 } 1418 /* process according to association state... */ 1419 switch (SCTP_GET_STATE(stcb)) { 1420 case SCTP_STATE_COOKIE_WAIT: 1421 /* this is the expected state for this chunk */ 1422 /* process the INIT-ACK parameters */ 1423 if (stcb->asoc.primary_destination->dest_state & 1424 SCTP_ADDR_UNCONFIRMED) { 1425 /* 1426 * The primary is where we sent the INIT, we can 1427 * always consider it confirmed when the INIT-ACK is 1428 * returned. Do this before we load addresses 1429 * though. 1430 */ 1431 stcb->asoc.primary_destination->dest_state &= 1432 ~SCTP_ADDR_UNCONFIRMED; 1433 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 1434 stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED); 1435 } 1436 if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb, 1437 net, abort_no_unlock, 1438 mflowtype, mflowid, 1439 vrf_id) < 0) { 1440 /* error in parsing parameters */ 1441 return (-1); 1442 } 1443 /* update our state */ 1444 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n"); 1445 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_ECHOED); 1446 1447 /* reset the RTO calc */ 1448 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 1449 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 1450 stcb->asoc.overall_error_count, 1451 0, 1452 SCTP_FROM_SCTP_INPUT, 1453 __LINE__); 1454 } 1455 stcb->asoc.overall_error_count = 0; 1456 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 1457 /* 1458 * collapse the init timer back in case of a exponential 1459 * backoff 1460 */ 1461 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep, 1462 stcb, net); 1463 /* 1464 * the send at the end of the inbound data processing will 1465 * cause the cookie to be sent 1466 */ 1467 break; 1468 case SCTP_STATE_SHUTDOWN_SENT: 1469 /* incorrect state... discard */ 1470 break; 1471 case SCTP_STATE_COOKIE_ECHOED: 1472 /* incorrect state... discard */ 1473 break; 1474 case SCTP_STATE_OPEN: 1475 /* incorrect state... discard */ 1476 break; 1477 case SCTP_STATE_EMPTY: 1478 case SCTP_STATE_INUSE: 1479 default: 1480 /* incorrect state... discard */ 1481 return (-1); 1482 break; 1483 } 1484 SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n"); 1485 return (0); 1486 } 1487 1488 static struct sctp_tcb * 1489 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1490 struct sockaddr *src, struct sockaddr *dst, 1491 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1492 struct sctp_inpcb *inp, struct sctp_nets **netp, 1493 struct sockaddr *init_src, int *notification, 1494 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1495 uint8_t mflowtype, uint32_t mflowid, 1496 uint32_t vrf_id, uint16_t port); 1497 1498 1499 /* 1500 * handle a state cookie for an existing association m: input packet mbuf 1501 * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a 1502 * "split" mbuf and the cookie signature does not exist offset: offset into 1503 * mbuf to the cookie-echo chunk 1504 */ 1505 static struct sctp_tcb * 1506 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset, 1507 struct sockaddr *src, struct sockaddr *dst, 1508 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1509 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp, 1510 struct sockaddr *init_src, int *notification, 1511 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1512 uint8_t mflowtype, uint32_t mflowid, 1513 uint32_t vrf_id, uint16_t port) 1514 { 1515 struct sctp_association *asoc; 1516 struct sctp_init_chunk *init_cp, init_buf; 1517 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1518 struct sctp_nets *net; 1519 struct mbuf *op_err; 1520 struct timeval old; 1521 int init_offset, initack_offset, i; 1522 int retval; 1523 int spec_flag = 0; 1524 uint32_t how_indx; 1525 #if defined(SCTP_DETAILED_STR_STATS) 1526 int j; 1527 #endif 1528 1529 net = *netp; 1530 /* I know that the TCB is non-NULL from the caller */ 1531 asoc = &stcb->asoc; 1532 for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) { 1533 if (asoc->cookie_how[how_indx] == 0) 1534 break; 1535 } 1536 if (how_indx < sizeof(asoc->cookie_how)) { 1537 asoc->cookie_how[how_indx] = 1; 1538 } 1539 if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 1540 /* SHUTDOWN came in after sending INIT-ACK */ 1541 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination); 1542 op_err = sctp_generate_cause(SCTP_CAUSE_COOKIE_IN_SHUTDOWN, ""); 1543 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 1544 mflowtype, mflowid, inp->fibnum, 1545 vrf_id, net->port); 1546 if (how_indx < sizeof(asoc->cookie_how)) 1547 asoc->cookie_how[how_indx] = 2; 1548 return (NULL); 1549 } 1550 /* 1551 * find and validate the INIT chunk in the cookie (peer's info) the 1552 * INIT should start after the cookie-echo header struct (chunk 1553 * header, state cookie header struct) 1554 */ 1555 init_offset = offset += sizeof(struct sctp_cookie_echo_chunk); 1556 1557 init_cp = (struct sctp_init_chunk *) 1558 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 1559 (uint8_t *)&init_buf); 1560 if (init_cp == NULL) { 1561 /* could not pull a INIT chunk in cookie */ 1562 return (NULL); 1563 } 1564 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 1565 return (NULL); 1566 } 1567 /* 1568 * find and validate the INIT-ACK chunk in the cookie (my info) the 1569 * INIT-ACK follows the INIT chunk 1570 */ 1571 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 1572 initack_cp = (struct sctp_init_ack_chunk *) 1573 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 1574 (uint8_t *)&initack_buf); 1575 if (initack_cp == NULL) { 1576 /* could not pull INIT-ACK chunk in cookie */ 1577 return (NULL); 1578 } 1579 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 1580 return (NULL); 1581 } 1582 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1583 (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) { 1584 /* 1585 * case D in Section 5.2.4 Table 2: MMAA process accordingly 1586 * to get into the OPEN state 1587 */ 1588 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1589 /*- 1590 * Opps, this means that we somehow generated two vtag's 1591 * the same. I.e. we did: 1592 * Us Peer 1593 * <---INIT(tag=a)------ 1594 * ----INIT-ACK(tag=t)--> 1595 * ----INIT(tag=t)------> *1 1596 * <---INIT-ACK(tag=a)--- 1597 * <----CE(tag=t)------------- *2 1598 * 1599 * At point *1 we should be generating a different 1600 * tag t'. Which means we would throw away the CE and send 1601 * ours instead. Basically this is case C (throw away side). 1602 */ 1603 if (how_indx < sizeof(asoc->cookie_how)) 1604 asoc->cookie_how[how_indx] = 17; 1605 return (NULL); 1606 1607 } 1608 switch (SCTP_GET_STATE(stcb)) { 1609 case SCTP_STATE_COOKIE_WAIT: 1610 case SCTP_STATE_COOKIE_ECHOED: 1611 /* 1612 * INIT was sent but got a COOKIE_ECHO with the 1613 * correct tags... just accept it...but we must 1614 * process the init so that we can make sure we have 1615 * the right seq no's. 1616 */ 1617 /* First we must process the INIT !! */ 1618 retval = sctp_process_init(init_cp, stcb); 1619 if (retval < 0) { 1620 if (how_indx < sizeof(asoc->cookie_how)) 1621 asoc->cookie_how[how_indx] = 3; 1622 return (NULL); 1623 } 1624 /* we have already processed the INIT so no problem */ 1625 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, 1626 stcb, net, 1627 SCTP_FROM_SCTP_INPUT + SCTP_LOC_13); 1628 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, 1629 stcb, net, 1630 SCTP_FROM_SCTP_INPUT + SCTP_LOC_14); 1631 /* update current state */ 1632 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) 1633 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1634 else 1635 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1636 1637 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 1638 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1639 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1640 stcb->sctp_ep, stcb, asoc->primary_destination); 1641 } 1642 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1643 sctp_stop_all_cookie_timers(stcb); 1644 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1645 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1646 (!SCTP_IS_LISTENING(inp))) { 1647 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1648 struct socket *so; 1649 #endif 1650 /* 1651 * Here is where collision would go if we 1652 * did a connect() and instead got a 1653 * init/init-ack/cookie done before the 1654 * init-ack came back.. 1655 */ 1656 stcb->sctp_ep->sctp_flags |= 1657 SCTP_PCB_FLAGS_CONNECTED; 1658 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1659 so = SCTP_INP_SO(stcb->sctp_ep); 1660 atomic_add_int(&stcb->asoc.refcnt, 1); 1661 SCTP_TCB_UNLOCK(stcb); 1662 SCTP_SOCKET_LOCK(so, 1); 1663 SCTP_TCB_LOCK(stcb); 1664 atomic_add_int(&stcb->asoc.refcnt, -1); 1665 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1666 SCTP_SOCKET_UNLOCK(so, 1); 1667 return (NULL); 1668 } 1669 #endif 1670 soisconnected(stcb->sctp_socket); 1671 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1672 SCTP_SOCKET_UNLOCK(so, 1); 1673 #endif 1674 } 1675 /* notify upper layer */ 1676 *notification = SCTP_NOTIFY_ASSOC_UP; 1677 /* 1678 * since we did not send a HB make sure we don't 1679 * double things 1680 */ 1681 old.tv_sec = cookie->time_entered.tv_sec; 1682 old.tv_usec = cookie->time_entered.tv_usec; 1683 net->hb_responded = 1; 1684 net->RTO = sctp_calculate_rto(stcb, asoc, net, 1685 &old, 1686 SCTP_RTT_FROM_NON_DATA); 1687 1688 if (stcb->asoc.sctp_autoclose_ticks && 1689 (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) { 1690 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 1691 inp, stcb, NULL); 1692 } 1693 break; 1694 default: 1695 /* 1696 * we're in the OPEN state (or beyond), so peer must 1697 * have simply lost the COOKIE-ACK 1698 */ 1699 break; 1700 } /* end switch */ 1701 sctp_stop_all_cookie_timers(stcb); 1702 /* 1703 * We ignore the return code here.. not sure if we should 1704 * somehow abort.. but we do have an existing asoc. This 1705 * really should not fail. 1706 */ 1707 if (sctp_load_addresses_from_init(stcb, m, 1708 init_offset + sizeof(struct sctp_init_chunk), 1709 initack_offset, src, dst, init_src, stcb->asoc.port)) { 1710 if (how_indx < sizeof(asoc->cookie_how)) 1711 asoc->cookie_how[how_indx] = 4; 1712 return (NULL); 1713 } 1714 /* respond with a COOKIE-ACK */ 1715 sctp_toss_old_cookies(stcb, asoc); 1716 sctp_send_cookie_ack(stcb); 1717 if (how_indx < sizeof(asoc->cookie_how)) 1718 asoc->cookie_how[how_indx] = 5; 1719 return (stcb); 1720 } 1721 1722 if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1723 ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag && 1724 cookie->tie_tag_my_vtag == 0 && 1725 cookie->tie_tag_peer_vtag == 0) { 1726 /* 1727 * case C in Section 5.2.4 Table 2: XMOO silently discard 1728 */ 1729 if (how_indx < sizeof(asoc->cookie_how)) 1730 asoc->cookie_how[how_indx] = 6; 1731 return (NULL); 1732 } 1733 /* 1734 * If nat support, and the below and stcb is established, send back 1735 * a ABORT(colliding state) if we are established. 1736 */ 1737 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) && 1738 (asoc->peer_supports_nat) && 1739 ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1740 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1741 (asoc->peer_vtag == 0)))) { 1742 /* 1743 * Special case - Peer's support nat. We may have two init's 1744 * that we gave out the same tag on since one was not 1745 * established.. i.e. we get INIT from host-1 behind the nat 1746 * and we respond tag-a, we get a INIT from host-2 behind 1747 * the nat and we get tag-a again. Then we bring up host-1 1748 * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1). 1749 * Now we have colliding state. We must send an abort here 1750 * with colliding state indication. 1751 */ 1752 op_err = sctp_generate_cause(SCTP_CAUSE_NAT_COLLIDING_STATE, ""); 1753 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err, 1754 mflowtype, mflowid, inp->fibnum, 1755 vrf_id, port); 1756 return (NULL); 1757 } 1758 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1759 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1760 (asoc->peer_vtag == 0))) { 1761 /* 1762 * case B in Section 5.2.4 Table 2: MXAA or MOAA my info 1763 * should be ok, re-accept peer info 1764 */ 1765 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1766 /* 1767 * Extension of case C. If we hit this, then the 1768 * random number generator returned the same vtag 1769 * when we first sent our INIT-ACK and when we later 1770 * sent our INIT. The side with the seq numbers that 1771 * are different will be the one that normnally 1772 * would have hit case C. This in effect "extends" 1773 * our vtags in this collision case to be 64 bits. 1774 * The same collision could occur aka you get both 1775 * vtag and seq number the same twice in a row.. but 1776 * is much less likely. If it did happen then we 1777 * would proceed through and bring up the assoc.. we 1778 * may end up with the wrong stream setup however.. 1779 * which would be bad.. but there is no way to 1780 * tell.. until we send on a stream that does not 1781 * exist :-) 1782 */ 1783 if (how_indx < sizeof(asoc->cookie_how)) 1784 asoc->cookie_how[how_indx] = 7; 1785 1786 return (NULL); 1787 } 1788 if (how_indx < sizeof(asoc->cookie_how)) 1789 asoc->cookie_how[how_indx] = 8; 1790 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, 1791 SCTP_FROM_SCTP_INPUT + SCTP_LOC_15); 1792 sctp_stop_all_cookie_timers(stcb); 1793 /* 1794 * since we did not send a HB make sure we don't double 1795 * things 1796 */ 1797 net->hb_responded = 1; 1798 if (stcb->asoc.sctp_autoclose_ticks && 1799 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 1800 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, 1801 NULL); 1802 } 1803 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1804 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 1805 1806 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) { 1807 /* 1808 * Ok the peer probably discarded our data (if we 1809 * echoed a cookie+data). So anything on the 1810 * sent_queue should be marked for retransmit, we 1811 * may not get something to kick us so it COULD 1812 * still take a timeout to move these.. but it can't 1813 * hurt to mark them. 1814 */ 1815 struct sctp_tmit_chunk *chk; 1816 1817 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 1818 if (chk->sent < SCTP_DATAGRAM_RESEND) { 1819 chk->sent = SCTP_DATAGRAM_RESEND; 1820 sctp_flight_size_decrease(chk); 1821 sctp_total_flight_decrease(stcb, chk); 1822 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 1823 spec_flag++; 1824 } 1825 } 1826 1827 } 1828 /* process the INIT info (peer's info) */ 1829 retval = sctp_process_init(init_cp, stcb); 1830 if (retval < 0) { 1831 if (how_indx < sizeof(asoc->cookie_how)) 1832 asoc->cookie_how[how_indx] = 9; 1833 return (NULL); 1834 } 1835 if (sctp_load_addresses_from_init(stcb, m, 1836 init_offset + sizeof(struct sctp_init_chunk), 1837 initack_offset, src, dst, init_src, stcb->asoc.port)) { 1838 if (how_indx < sizeof(asoc->cookie_how)) 1839 asoc->cookie_how[how_indx] = 10; 1840 return (NULL); 1841 } 1842 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || 1843 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 1844 *notification = SCTP_NOTIFY_ASSOC_UP; 1845 1846 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1847 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1848 (!SCTP_IS_LISTENING(inp))) { 1849 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1850 struct socket *so; 1851 #endif 1852 stcb->sctp_ep->sctp_flags |= 1853 SCTP_PCB_FLAGS_CONNECTED; 1854 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1855 so = SCTP_INP_SO(stcb->sctp_ep); 1856 atomic_add_int(&stcb->asoc.refcnt, 1); 1857 SCTP_TCB_UNLOCK(stcb); 1858 SCTP_SOCKET_LOCK(so, 1); 1859 SCTP_TCB_LOCK(stcb); 1860 atomic_add_int(&stcb->asoc.refcnt, -1); 1861 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1862 SCTP_SOCKET_UNLOCK(so, 1); 1863 return (NULL); 1864 } 1865 #endif 1866 soisconnected(stcb->sctp_socket); 1867 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1868 SCTP_SOCKET_UNLOCK(so, 1); 1869 #endif 1870 } 1871 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) 1872 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1873 else 1874 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1875 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1876 } else if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) { 1877 SCTP_STAT_INCR_COUNTER32(sctps_restartestab); 1878 } else { 1879 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1880 } 1881 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 1882 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1883 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1884 stcb->sctp_ep, stcb, asoc->primary_destination); 1885 } 1886 sctp_stop_all_cookie_timers(stcb); 1887 sctp_toss_old_cookies(stcb, asoc); 1888 sctp_send_cookie_ack(stcb); 1889 if (spec_flag) { 1890 /* 1891 * only if we have retrans set do we do this. What 1892 * this call does is get only the COOKIE-ACK out and 1893 * then when we return the normal call to 1894 * sctp_chunk_output will get the retrans out behind 1895 * this. 1896 */ 1897 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED); 1898 } 1899 if (how_indx < sizeof(asoc->cookie_how)) 1900 asoc->cookie_how[how_indx] = 11; 1901 1902 return (stcb); 1903 } 1904 if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1905 ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) && 1906 cookie->tie_tag_my_vtag == asoc->my_vtag_nonce && 1907 cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce && 1908 cookie->tie_tag_peer_vtag != 0) { 1909 struct sctpasochead *head; 1910 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1911 struct socket *so; 1912 #endif 1913 1914 if (asoc->peer_supports_nat) { 1915 /* 1916 * This is a gross gross hack. Just call the 1917 * cookie_new code since we are allowing a duplicate 1918 * association. I hope this works... 1919 */ 1920 return (sctp_process_cookie_new(m, iphlen, offset, src, dst, 1921 sh, cookie, cookie_len, 1922 inp, netp, init_src, notification, 1923 auth_skipped, auth_offset, auth_len, 1924 mflowtype, mflowid, 1925 vrf_id, port)); 1926 } 1927 /* 1928 * case A in Section 5.2.4 Table 2: XXMM (peer restarted) 1929 */ 1930 /* temp code */ 1931 if (how_indx < sizeof(asoc->cookie_how)) 1932 asoc->cookie_how[how_indx] = 12; 1933 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, 1934 SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 1935 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, 1936 SCTP_FROM_SCTP_INPUT + SCTP_LOC_17); 1937 1938 /* notify upper layer */ 1939 *notification = SCTP_NOTIFY_ASSOC_RESTART; 1940 atomic_add_int(&stcb->asoc.refcnt, 1); 1941 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_OPEN) && 1942 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) && 1943 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT)) { 1944 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1945 } 1946 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) { 1947 SCTP_STAT_INCR_GAUGE32(sctps_restartestab); 1948 } else if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) { 1949 SCTP_STAT_INCR_GAUGE32(sctps_collisionestab); 1950 } 1951 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1952 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 1953 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1954 stcb->sctp_ep, stcb, asoc->primary_destination); 1955 1956 } else if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) { 1957 /* move to OPEN state, if not in SHUTDOWN_SENT */ 1958 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 1959 } 1960 asoc->pre_open_streams = 1961 ntohs(initack_cp->init.num_outbound_streams); 1962 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 1963 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 1964 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 1965 1966 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 1967 1968 asoc->str_reset_seq_in = asoc->init_seq_number; 1969 1970 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 1971 if (asoc->mapping_array) { 1972 memset(asoc->mapping_array, 0, 1973 asoc->mapping_array_size); 1974 } 1975 if (asoc->nr_mapping_array) { 1976 memset(asoc->nr_mapping_array, 0, 1977 asoc->mapping_array_size); 1978 } 1979 SCTP_TCB_UNLOCK(stcb); 1980 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1981 so = SCTP_INP_SO(stcb->sctp_ep); 1982 SCTP_SOCKET_LOCK(so, 1); 1983 #endif 1984 SCTP_INP_INFO_WLOCK(); 1985 SCTP_INP_WLOCK(stcb->sctp_ep); 1986 SCTP_TCB_LOCK(stcb); 1987 atomic_add_int(&stcb->asoc.refcnt, -1); 1988 /* send up all the data */ 1989 SCTP_TCB_SEND_LOCK(stcb); 1990 1991 sctp_report_all_outbound(stcb, 0, 1, SCTP_SO_LOCKED); 1992 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 1993 stcb->asoc.strmout[i].chunks_on_queues = 0; 1994 #if defined(SCTP_DETAILED_STR_STATS) 1995 for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) { 1996 asoc->strmout[i].abandoned_sent[j] = 0; 1997 asoc->strmout[i].abandoned_unsent[j] = 0; 1998 } 1999 #else 2000 asoc->strmout[i].abandoned_sent[0] = 0; 2001 asoc->strmout[i].abandoned_unsent[0] = 0; 2002 #endif 2003 stcb->asoc.strmout[i].sid = i; 2004 stcb->asoc.strmout[i].next_mid_ordered = 0; 2005 stcb->asoc.strmout[i].next_mid_unordered = 0; 2006 stcb->asoc.strmout[i].last_msg_incomplete = 0; 2007 } 2008 /* process the INIT-ACK info (my info) */ 2009 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 2010 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 2011 2012 /* pull from vtag hash */ 2013 LIST_REMOVE(stcb, sctp_asocs); 2014 /* re-insert to new vtag position */ 2015 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, 2016 SCTP_BASE_INFO(hashasocmark))]; 2017 /* 2018 * put it in the bucket in the vtag hash of assoc's for the 2019 * system 2020 */ 2021 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 2022 2023 SCTP_TCB_SEND_UNLOCK(stcb); 2024 SCTP_INP_WUNLOCK(stcb->sctp_ep); 2025 SCTP_INP_INFO_WUNLOCK(); 2026 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2027 SCTP_SOCKET_UNLOCK(so, 1); 2028 #endif 2029 asoc->total_flight = 0; 2030 asoc->total_flight_count = 0; 2031 /* process the INIT info (peer's info) */ 2032 retval = sctp_process_init(init_cp, stcb); 2033 if (retval < 0) { 2034 if (how_indx < sizeof(asoc->cookie_how)) 2035 asoc->cookie_how[how_indx] = 13; 2036 2037 return (NULL); 2038 } 2039 /* 2040 * since we did not send a HB make sure we don't double 2041 * things 2042 */ 2043 net->hb_responded = 1; 2044 2045 if (sctp_load_addresses_from_init(stcb, m, 2046 init_offset + sizeof(struct sctp_init_chunk), 2047 initack_offset, src, dst, init_src, stcb->asoc.port)) { 2048 if (how_indx < sizeof(asoc->cookie_how)) 2049 asoc->cookie_how[how_indx] = 14; 2050 2051 return (NULL); 2052 } 2053 /* respond with a COOKIE-ACK */ 2054 sctp_stop_all_cookie_timers(stcb); 2055 sctp_toss_old_cookies(stcb, asoc); 2056 sctp_send_cookie_ack(stcb); 2057 if (how_indx < sizeof(asoc->cookie_how)) 2058 asoc->cookie_how[how_indx] = 15; 2059 2060 return (stcb); 2061 } 2062 if (how_indx < sizeof(asoc->cookie_how)) 2063 asoc->cookie_how[how_indx] = 16; 2064 /* all other cases... */ 2065 return (NULL); 2066 } 2067 2068 2069 /* 2070 * handle a state cookie for a new association m: input packet mbuf chain-- 2071 * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf 2072 * and the cookie signature does not exist offset: offset into mbuf to the 2073 * cookie-echo chunk length: length of the cookie chunk to: where the init 2074 * was from returns a new TCB 2075 */ 2076 static struct sctp_tcb * 2077 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 2078 struct sockaddr *src, struct sockaddr *dst, 2079 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 2080 struct sctp_inpcb *inp, struct sctp_nets **netp, 2081 struct sockaddr *init_src, int *notification, 2082 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2083 uint8_t mflowtype, uint32_t mflowid, 2084 uint32_t vrf_id, uint16_t port) 2085 { 2086 struct sctp_tcb *stcb; 2087 struct sctp_init_chunk *init_cp, init_buf; 2088 struct sctp_init_ack_chunk *initack_cp, initack_buf; 2089 union sctp_sockstore store; 2090 struct sctp_association *asoc; 2091 int init_offset, initack_offset, initack_limit; 2092 int retval; 2093 int error = 0; 2094 uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE]; 2095 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2096 struct socket *so; 2097 2098 so = SCTP_INP_SO(inp); 2099 #endif 2100 2101 /* 2102 * find and validate the INIT chunk in the cookie (peer's info) the 2103 * INIT should start after the cookie-echo header struct (chunk 2104 * header, state cookie header struct) 2105 */ 2106 init_offset = offset + sizeof(struct sctp_cookie_echo_chunk); 2107 init_cp = (struct sctp_init_chunk *) 2108 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 2109 (uint8_t *)&init_buf); 2110 if (init_cp == NULL) { 2111 /* could not pull a INIT chunk in cookie */ 2112 SCTPDBG(SCTP_DEBUG_INPUT1, 2113 "process_cookie_new: could not pull INIT chunk hdr\n"); 2114 return (NULL); 2115 } 2116 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 2117 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n"); 2118 return (NULL); 2119 } 2120 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 2121 /* 2122 * find and validate the INIT-ACK chunk in the cookie (my info) the 2123 * INIT-ACK follows the INIT chunk 2124 */ 2125 initack_cp = (struct sctp_init_ack_chunk *) 2126 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 2127 (uint8_t *)&initack_buf); 2128 if (initack_cp == NULL) { 2129 /* could not pull INIT-ACK chunk in cookie */ 2130 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n"); 2131 return (NULL); 2132 } 2133 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 2134 return (NULL); 2135 } 2136 /* 2137 * NOTE: We can't use the INIT_ACK's chk_length to determine the 2138 * "initack_limit" value. This is because the chk_length field 2139 * includes the length of the cookie, but the cookie is omitted when 2140 * the INIT and INIT_ACK are tacked onto the cookie... 2141 */ 2142 initack_limit = offset + cookie_len; 2143 2144 /* 2145 * now that we know the INIT/INIT-ACK are in place, create a new TCB 2146 * and popluate 2147 */ 2148 2149 /* 2150 * Here we do a trick, we set in NULL for the proc/thread argument. 2151 * We do this since in effect we only use the p argument when the 2152 * socket is unbound and we must do an implicit bind. Since we are 2153 * getting a cookie, we cannot be unbound. 2154 */ 2155 stcb = sctp_aloc_assoc(inp, init_src, &error, 2156 ntohl(initack_cp->init.initiate_tag), vrf_id, 2157 ntohs(initack_cp->init.num_outbound_streams), 2158 port, 2159 (struct thread *)NULL 2160 ); 2161 if (stcb == NULL) { 2162 struct mbuf *op_err; 2163 2164 /* memory problem? */ 2165 SCTPDBG(SCTP_DEBUG_INPUT1, 2166 "process_cookie_new: no room for another TCB!\n"); 2167 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2168 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2169 src, dst, sh, op_err, 2170 mflowtype, mflowid, 2171 vrf_id, port); 2172 return (NULL); 2173 } 2174 /* get the correct sctp_nets */ 2175 if (netp) 2176 *netp = sctp_findnet(stcb, init_src); 2177 2178 asoc = &stcb->asoc; 2179 /* get scope variables out of cookie */ 2180 asoc->scope.ipv4_local_scope = cookie->ipv4_scope; 2181 asoc->scope.site_scope = cookie->site_scope; 2182 asoc->scope.local_scope = cookie->local_scope; 2183 asoc->scope.loopback_scope = cookie->loopback_scope; 2184 2185 if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) || 2186 (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) { 2187 struct mbuf *op_err; 2188 2189 /* 2190 * Houston we have a problem. The EP changed while the 2191 * cookie was in flight. Only recourse is to abort the 2192 * association. 2193 */ 2194 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2195 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2196 src, dst, sh, op_err, 2197 mflowtype, mflowid, 2198 vrf_id, port); 2199 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2200 atomic_add_int(&stcb->asoc.refcnt, 1); 2201 SCTP_TCB_UNLOCK(stcb); 2202 SCTP_SOCKET_LOCK(so, 1); 2203 SCTP_TCB_LOCK(stcb); 2204 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2205 #endif 2206 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2207 SCTP_FROM_SCTP_INPUT + SCTP_LOC_18); 2208 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2209 SCTP_SOCKET_UNLOCK(so, 1); 2210 #endif 2211 return (NULL); 2212 } 2213 /* process the INIT-ACK info (my info) */ 2214 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 2215 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 2216 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 2217 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 2218 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 2219 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 2220 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 2221 asoc->str_reset_seq_in = asoc->init_seq_number; 2222 2223 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 2224 2225 /* process the INIT info (peer's info) */ 2226 if (netp) 2227 retval = sctp_process_init(init_cp, stcb); 2228 else 2229 retval = 0; 2230 if (retval < 0) { 2231 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2232 atomic_add_int(&stcb->asoc.refcnt, 1); 2233 SCTP_TCB_UNLOCK(stcb); 2234 SCTP_SOCKET_LOCK(so, 1); 2235 SCTP_TCB_LOCK(stcb); 2236 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2237 #endif 2238 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2239 SCTP_FROM_SCTP_INPUT + SCTP_LOC_19); 2240 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2241 SCTP_SOCKET_UNLOCK(so, 1); 2242 #endif 2243 return (NULL); 2244 } 2245 /* load all addresses */ 2246 if (sctp_load_addresses_from_init(stcb, m, 2247 init_offset + sizeof(struct sctp_init_chunk), initack_offset, 2248 src, dst, init_src, port)) { 2249 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2250 atomic_add_int(&stcb->asoc.refcnt, 1); 2251 SCTP_TCB_UNLOCK(stcb); 2252 SCTP_SOCKET_LOCK(so, 1); 2253 SCTP_TCB_LOCK(stcb); 2254 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2255 #endif 2256 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2257 SCTP_FROM_SCTP_INPUT + SCTP_LOC_20); 2258 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2259 SCTP_SOCKET_UNLOCK(so, 1); 2260 #endif 2261 return (NULL); 2262 } 2263 /* 2264 * verify any preceding AUTH chunk that was skipped 2265 */ 2266 /* pull the local authentication parameters from the cookie/init-ack */ 2267 sctp_auth_get_cookie_params(stcb, m, 2268 initack_offset + sizeof(struct sctp_init_ack_chunk), 2269 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk))); 2270 if (auth_skipped) { 2271 struct sctp_auth_chunk *auth; 2272 2273 auth = (struct sctp_auth_chunk *) 2274 sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf); 2275 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) { 2276 /* auth HMAC failed, dump the assoc and packet */ 2277 SCTPDBG(SCTP_DEBUG_AUTH1, 2278 "COOKIE-ECHO: AUTH failed\n"); 2279 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2280 atomic_add_int(&stcb->asoc.refcnt, 1); 2281 SCTP_TCB_UNLOCK(stcb); 2282 SCTP_SOCKET_LOCK(so, 1); 2283 SCTP_TCB_LOCK(stcb); 2284 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2285 #endif 2286 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2287 SCTP_FROM_SCTP_INPUT + SCTP_LOC_21); 2288 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2289 SCTP_SOCKET_UNLOCK(so, 1); 2290 #endif 2291 return (NULL); 2292 } else { 2293 /* remaining chunks checked... good to go */ 2294 stcb->asoc.authenticated = 1; 2295 } 2296 } 2297 2298 /* 2299 * if we're doing ASCONFs, check to see if we have any new local 2300 * addresses that need to get added to the peer (eg. addresses 2301 * changed while cookie echo in flight). This needs to be done 2302 * after we go to the OPEN state to do the correct asconf 2303 * processing. else, make sure we have the correct addresses in our 2304 * lists 2305 */ 2306 2307 /* warning, we re-use sin, sin6, sa_store here! */ 2308 /* pull in local_address (our "from" address) */ 2309 switch (cookie->laddr_type) { 2310 #ifdef INET 2311 case SCTP_IPV4_ADDRESS: 2312 /* source addr is IPv4 */ 2313 memset(&store.sin, 0, sizeof(struct sockaddr_in)); 2314 store.sin.sin_family = AF_INET; 2315 store.sin.sin_len = sizeof(struct sockaddr_in); 2316 store.sin.sin_addr.s_addr = cookie->laddress[0]; 2317 break; 2318 #endif 2319 #ifdef INET6 2320 case SCTP_IPV6_ADDRESS: 2321 /* source addr is IPv6 */ 2322 memset(&store.sin6, 0, sizeof(struct sockaddr_in6)); 2323 store.sin6.sin6_family = AF_INET6; 2324 store.sin6.sin6_len = sizeof(struct sockaddr_in6); 2325 store.sin6.sin6_scope_id = cookie->scope_id; 2326 memcpy(&store.sin6.sin6_addr, cookie->laddress, sizeof(struct in6_addr)); 2327 break; 2328 #endif 2329 default: 2330 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2331 atomic_add_int(&stcb->asoc.refcnt, 1); 2332 SCTP_TCB_UNLOCK(stcb); 2333 SCTP_SOCKET_LOCK(so, 1); 2334 SCTP_TCB_LOCK(stcb); 2335 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2336 #endif 2337 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2338 SCTP_FROM_SCTP_INPUT + SCTP_LOC_22); 2339 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2340 SCTP_SOCKET_UNLOCK(so, 1); 2341 #endif 2342 return (NULL); 2343 } 2344 2345 /* update current state */ 2346 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2347 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 2348 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2349 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2350 stcb->sctp_ep, stcb, asoc->primary_destination); 2351 } 2352 sctp_stop_all_cookie_timers(stcb); 2353 SCTP_STAT_INCR_COUNTER32(sctps_passiveestab); 2354 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2355 2356 /* set up to notify upper layer */ 2357 *notification = SCTP_NOTIFY_ASSOC_UP; 2358 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2359 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 2360 (!SCTP_IS_LISTENING(inp))) { 2361 /* 2362 * This is an endpoint that called connect() how it got a 2363 * cookie that is NEW is a bit of a mystery. It must be that 2364 * the INIT was sent, but before it got there.. a complete 2365 * INIT/INIT-ACK/COOKIE arrived. But of course then it 2366 * should have went to the other code.. not here.. oh well.. 2367 * a bit of protection is worth having.. 2368 */ 2369 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2370 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2371 atomic_add_int(&stcb->asoc.refcnt, 1); 2372 SCTP_TCB_UNLOCK(stcb); 2373 SCTP_SOCKET_LOCK(so, 1); 2374 SCTP_TCB_LOCK(stcb); 2375 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2376 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2377 SCTP_SOCKET_UNLOCK(so, 1); 2378 return (NULL); 2379 } 2380 #endif 2381 soisconnected(stcb->sctp_socket); 2382 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2383 SCTP_SOCKET_UNLOCK(so, 1); 2384 #endif 2385 } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 2386 (SCTP_IS_LISTENING(inp))) { 2387 /* 2388 * We don't want to do anything with this one. Since it is 2389 * the listening guy. The timer will get started for 2390 * accepted connections in the caller. 2391 */ 2392 ; 2393 } 2394 /* since we did not send a HB make sure we don't double things */ 2395 if ((netp) && (*netp)) 2396 (*netp)->hb_responded = 1; 2397 2398 if (stcb->asoc.sctp_autoclose_ticks && 2399 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2400 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL); 2401 } 2402 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 2403 if ((netp != NULL) && (*netp != NULL)) { 2404 struct timeval old; 2405 2406 /* calculate the RTT and set the encaps port */ 2407 old.tv_sec = cookie->time_entered.tv_sec; 2408 old.tv_usec = cookie->time_entered.tv_usec; 2409 (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp, 2410 &old, SCTP_RTT_FROM_NON_DATA); 2411 } 2412 /* respond with a COOKIE-ACK */ 2413 sctp_send_cookie_ack(stcb); 2414 2415 /* 2416 * check the address lists for any ASCONFs that need to be sent 2417 * AFTER the cookie-ack is sent 2418 */ 2419 sctp_check_address_list(stcb, m, 2420 initack_offset + sizeof(struct sctp_init_ack_chunk), 2421 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)), 2422 &store.sa, cookie->local_scope, cookie->site_scope, 2423 cookie->ipv4_scope, cookie->loopback_scope); 2424 2425 2426 return (stcb); 2427 } 2428 2429 /* 2430 * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e 2431 * we NEED to make sure we are not already using the vtag. If so we 2432 * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit! 2433 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag, 2434 SCTP_BASE_INFO(hashasocmark))]; 2435 LIST_FOREACH(stcb, head, sctp_asocs) { 2436 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep)) { 2437 -- SEND ABORT - TRY AGAIN -- 2438 } 2439 } 2440 */ 2441 2442 /* 2443 * handles a COOKIE-ECHO message stcb: modified to either a new or left as 2444 * existing (non-NULL) TCB 2445 */ 2446 static struct mbuf * 2447 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset, 2448 struct sockaddr *src, struct sockaddr *dst, 2449 struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp, 2450 struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp, 2451 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2452 struct sctp_tcb **locked_tcb, 2453 uint8_t mflowtype, uint32_t mflowid, 2454 uint32_t vrf_id, uint16_t port) 2455 { 2456 struct sctp_state_cookie *cookie; 2457 struct sctp_tcb *l_stcb = *stcb; 2458 struct sctp_inpcb *l_inp; 2459 struct sockaddr *to; 2460 struct sctp_pcb *ep; 2461 struct mbuf *m_sig; 2462 uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE]; 2463 uint8_t *sig; 2464 uint8_t cookie_ok = 0; 2465 unsigned int sig_offset, cookie_offset; 2466 unsigned int cookie_len; 2467 struct timeval now; 2468 struct timeval time_expires; 2469 int notification = 0; 2470 struct sctp_nets *netl; 2471 int had_a_existing_tcb = 0; 2472 int send_int_conf = 0; 2473 #ifdef INET 2474 struct sockaddr_in sin; 2475 #endif 2476 #ifdef INET6 2477 struct sockaddr_in6 sin6; 2478 #endif 2479 2480 SCTPDBG(SCTP_DEBUG_INPUT2, 2481 "sctp_handle_cookie: handling COOKIE-ECHO\n"); 2482 2483 if (inp_p == NULL) { 2484 return (NULL); 2485 } 2486 cookie = &cp->cookie; 2487 cookie_offset = offset + sizeof(struct sctp_chunkhdr); 2488 cookie_len = ntohs(cp->ch.chunk_length); 2489 2490 if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) + 2491 sizeof(struct sctp_init_chunk) + 2492 sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) { 2493 /* cookie too small */ 2494 return (NULL); 2495 } 2496 if ((cookie->peerport != sh->src_port) || 2497 (cookie->myport != sh->dest_port) || 2498 (cookie->my_vtag != sh->v_tag)) { 2499 /* 2500 * invalid ports or bad tag. Note that we always leave the 2501 * v_tag in the header in network order and when we stored 2502 * it in the my_vtag slot we also left it in network order. 2503 * This maintains the match even though it may be in the 2504 * opposite byte order of the machine :-> 2505 */ 2506 return (NULL); 2507 } 2508 /* 2509 * split off the signature into its own mbuf (since it should not be 2510 * calculated in the sctp_hmac_m() call). 2511 */ 2512 sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE; 2513 m_sig = m_split(m, sig_offset, M_NOWAIT); 2514 if (m_sig == NULL) { 2515 /* out of memory or ?? */ 2516 return (NULL); 2517 } 2518 #ifdef SCTP_MBUF_LOGGING 2519 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 2520 sctp_log_mbc(m_sig, SCTP_MBUF_SPLIT); 2521 } 2522 #endif 2523 2524 /* 2525 * compute the signature/digest for the cookie 2526 */ 2527 ep = &(*inp_p)->sctp_ep; 2528 l_inp = *inp_p; 2529 if (l_stcb) { 2530 SCTP_TCB_UNLOCK(l_stcb); 2531 } 2532 SCTP_INP_RLOCK(l_inp); 2533 if (l_stcb) { 2534 SCTP_TCB_LOCK(l_stcb); 2535 } 2536 /* which cookie is it? */ 2537 if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) && 2538 (ep->current_secret_number != ep->last_secret_number)) { 2539 /* it's the old cookie */ 2540 (void)sctp_hmac_m(SCTP_HMAC, 2541 (uint8_t *)ep->secret_key[(int)ep->last_secret_number], 2542 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2543 } else { 2544 /* it's the current cookie */ 2545 (void)sctp_hmac_m(SCTP_HMAC, 2546 (uint8_t *)ep->secret_key[(int)ep->current_secret_number], 2547 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2548 } 2549 /* get the signature */ 2550 SCTP_INP_RUNLOCK(l_inp); 2551 sig = (uint8_t *)sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *)&tmp_sig); 2552 if (sig == NULL) { 2553 /* couldn't find signature */ 2554 sctp_m_freem(m_sig); 2555 return (NULL); 2556 } 2557 /* compare the received digest with the computed digest */ 2558 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) { 2559 /* try the old cookie? */ 2560 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) && 2561 (ep->current_secret_number != ep->last_secret_number)) { 2562 /* compute digest with old */ 2563 (void)sctp_hmac_m(SCTP_HMAC, 2564 (uint8_t *)ep->secret_key[(int)ep->last_secret_number], 2565 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2566 /* compare */ 2567 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0) 2568 cookie_ok = 1; 2569 } 2570 } else { 2571 cookie_ok = 1; 2572 } 2573 2574 /* 2575 * Now before we continue we must reconstruct our mbuf so that 2576 * normal processing of any other chunks will work. 2577 */ 2578 { 2579 struct mbuf *m_at; 2580 2581 m_at = m; 2582 while (SCTP_BUF_NEXT(m_at) != NULL) { 2583 m_at = SCTP_BUF_NEXT(m_at); 2584 } 2585 SCTP_BUF_NEXT(m_at) = m_sig; 2586 } 2587 2588 if (cookie_ok == 0) { 2589 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n"); 2590 SCTPDBG(SCTP_DEBUG_INPUT2, 2591 "offset = %u, cookie_offset = %u, sig_offset = %u\n", 2592 (uint32_t)offset, cookie_offset, sig_offset); 2593 return (NULL); 2594 } 2595 2596 /* 2597 * check the cookie timestamps to be sure it's not stale 2598 */ 2599 (void)SCTP_GETTIME_TIMEVAL(&now); 2600 /* Expire time is in Ticks, so we convert to seconds */ 2601 time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life); 2602 time_expires.tv_usec = cookie->time_entered.tv_usec; 2603 if (timevalcmp(&now, &time_expires, >)) { 2604 /* cookie is stale! */ 2605 struct mbuf *op_err; 2606 struct sctp_error_stale_cookie *cause; 2607 struct timeval diff; 2608 uint32_t staleness; 2609 2610 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_error_stale_cookie), 2611 0, M_NOWAIT, 1, MT_DATA); 2612 if (op_err == NULL) { 2613 /* FOOBAR */ 2614 return (NULL); 2615 } 2616 /* Set the len */ 2617 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_error_stale_cookie); 2618 cause = mtod(op_err, struct sctp_error_stale_cookie *); 2619 cause->cause.code = htons(SCTP_CAUSE_STALE_COOKIE); 2620 cause->cause.length = htons((sizeof(struct sctp_paramhdr) + 2621 (sizeof(uint32_t)))); 2622 diff = now; 2623 timevalsub(&diff, &time_expires); 2624 if ((uint32_t)diff.tv_sec > UINT32_MAX / 1000000) { 2625 staleness = UINT32_MAX; 2626 } else { 2627 staleness = diff.tv_sec * 1000000; 2628 } 2629 if (UINT32_MAX - staleness >= (uint32_t)diff.tv_usec) { 2630 staleness += diff.tv_usec; 2631 } else { 2632 staleness = UINT32_MAX; 2633 } 2634 cause->stale_time = htonl(staleness); 2635 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 2636 mflowtype, mflowid, l_inp->fibnum, 2637 vrf_id, port); 2638 return (NULL); 2639 } 2640 /* 2641 * Now we must see with the lookup address if we have an existing 2642 * asoc. This will only happen if we were in the COOKIE-WAIT state 2643 * and a INIT collided with us and somewhere the peer sent the 2644 * cookie on another address besides the single address our assoc 2645 * had for him. In this case we will have one of the tie-tags set at 2646 * least AND the address field in the cookie can be used to look it 2647 * up. 2648 */ 2649 to = NULL; 2650 switch (cookie->addr_type) { 2651 #ifdef INET6 2652 case SCTP_IPV6_ADDRESS: 2653 memset(&sin6, 0, sizeof(sin6)); 2654 sin6.sin6_family = AF_INET6; 2655 sin6.sin6_len = sizeof(sin6); 2656 sin6.sin6_port = sh->src_port; 2657 sin6.sin6_scope_id = cookie->scope_id; 2658 memcpy(&sin6.sin6_addr.s6_addr, cookie->address, 2659 sizeof(sin6.sin6_addr.s6_addr)); 2660 to = (struct sockaddr *)&sin6; 2661 break; 2662 #endif 2663 #ifdef INET 2664 case SCTP_IPV4_ADDRESS: 2665 memset(&sin, 0, sizeof(sin)); 2666 sin.sin_family = AF_INET; 2667 sin.sin_len = sizeof(sin); 2668 sin.sin_port = sh->src_port; 2669 sin.sin_addr.s_addr = cookie->address[0]; 2670 to = (struct sockaddr *)&sin; 2671 break; 2672 #endif 2673 default: 2674 /* This should not happen */ 2675 return (NULL); 2676 } 2677 if (*stcb == NULL) { 2678 /* Yep, lets check */ 2679 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL); 2680 if (*stcb == NULL) { 2681 /* 2682 * We should have only got back the same inp. If we 2683 * got back a different ep we have a problem. The 2684 * original findep got back l_inp and now 2685 */ 2686 if (l_inp != *inp_p) { 2687 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n"); 2688 } 2689 } else { 2690 if (*locked_tcb == NULL) { 2691 /* 2692 * In this case we found the assoc only 2693 * after we locked the create lock. This 2694 * means we are in a colliding case and we 2695 * must make sure that we unlock the tcb if 2696 * its one of the cases where we throw away 2697 * the incoming packets. 2698 */ 2699 *locked_tcb = *stcb; 2700 2701 /* 2702 * We must also increment the inp ref count 2703 * since the ref_count flags was set when we 2704 * did not find the TCB, now we found it 2705 * which reduces the refcount.. we must 2706 * raise it back out to balance it all :-) 2707 */ 2708 SCTP_INP_INCR_REF((*stcb)->sctp_ep); 2709 if ((*stcb)->sctp_ep != l_inp) { 2710 SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n", 2711 (void *)(*stcb)->sctp_ep, (void *)l_inp); 2712 } 2713 } 2714 } 2715 } 2716 2717 cookie_len -= SCTP_SIGNATURE_SIZE; 2718 if (*stcb == NULL) { 2719 /* this is the "normal" case... get a new TCB */ 2720 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh, 2721 cookie, cookie_len, *inp_p, 2722 netp, to, ¬ification, 2723 auth_skipped, auth_offset, auth_len, 2724 mflowtype, mflowid, 2725 vrf_id, port); 2726 } else { 2727 /* this is abnormal... cookie-echo on existing TCB */ 2728 had_a_existing_tcb = 1; 2729 *stcb = sctp_process_cookie_existing(m, iphlen, offset, 2730 src, dst, sh, 2731 cookie, cookie_len, *inp_p, *stcb, netp, to, 2732 ¬ification, auth_skipped, auth_offset, auth_len, 2733 mflowtype, mflowid, 2734 vrf_id, port); 2735 } 2736 2737 if (*stcb == NULL) { 2738 /* still no TCB... must be bad cookie-echo */ 2739 return (NULL); 2740 } 2741 if (*netp != NULL) { 2742 (*netp)->flowtype = mflowtype; 2743 (*netp)->flowid = mflowid; 2744 } 2745 /* 2746 * Ok, we built an association so confirm the address we sent the 2747 * INIT-ACK to. 2748 */ 2749 netl = sctp_findnet(*stcb, to); 2750 /* 2751 * This code should in theory NOT run but 2752 */ 2753 if (netl == NULL) { 2754 /* TSNH! Huh, why do I need to add this address here? */ 2755 if (sctp_add_remote_addr(*stcb, to, NULL, port, 2756 SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) { 2757 return (NULL); 2758 } 2759 netl = sctp_findnet(*stcb, to); 2760 } 2761 if (netl) { 2762 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) { 2763 netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 2764 (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL, 2765 netl); 2766 send_int_conf = 1; 2767 } 2768 } 2769 sctp_start_net_timers(*stcb); 2770 if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) { 2771 if (!had_a_existing_tcb || 2772 (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) { 2773 /* 2774 * If we have a NEW cookie or the connect never 2775 * reached the connected state during collision we 2776 * must do the TCP accept thing. 2777 */ 2778 struct socket *so, *oso; 2779 struct sctp_inpcb *inp; 2780 2781 if (notification == SCTP_NOTIFY_ASSOC_RESTART) { 2782 /* 2783 * For a restart we will keep the same 2784 * socket, no need to do anything. I THINK!! 2785 */ 2786 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2787 if (send_int_conf) { 2788 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2789 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2790 } 2791 return (m); 2792 } 2793 oso = (*inp_p)->sctp_socket; 2794 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2795 SCTP_TCB_UNLOCK((*stcb)); 2796 CURVNET_SET(oso->so_vnet); 2797 so = sonewconn(oso, 0 2798 ); 2799 CURVNET_RESTORE(); 2800 SCTP_TCB_LOCK((*stcb)); 2801 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2802 2803 if (so == NULL) { 2804 struct mbuf *op_err; 2805 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2806 struct socket *pcb_so; 2807 #endif 2808 /* Too many sockets */ 2809 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n"); 2810 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2811 sctp_abort_association(*inp_p, NULL, m, iphlen, 2812 src, dst, sh, op_err, 2813 mflowtype, mflowid, 2814 vrf_id, port); 2815 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2816 pcb_so = SCTP_INP_SO(*inp_p); 2817 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2818 SCTP_TCB_UNLOCK((*stcb)); 2819 SCTP_SOCKET_LOCK(pcb_so, 1); 2820 SCTP_TCB_LOCK((*stcb)); 2821 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2822 #endif 2823 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, 2824 SCTP_FROM_SCTP_INPUT + SCTP_LOC_23); 2825 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2826 SCTP_SOCKET_UNLOCK(pcb_so, 1); 2827 #endif 2828 return (NULL); 2829 } 2830 inp = (struct sctp_inpcb *)so->so_pcb; 2831 SCTP_INP_INCR_REF(inp); 2832 /* 2833 * We add the unbound flag here so that if we get an 2834 * soabort() before we get the move_pcb done, we 2835 * will properly cleanup. 2836 */ 2837 inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE | 2838 SCTP_PCB_FLAGS_CONNECTED | 2839 SCTP_PCB_FLAGS_IN_TCPPOOL | 2840 SCTP_PCB_FLAGS_UNBOUND | 2841 (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) | 2842 SCTP_PCB_FLAGS_DONT_WAKE); 2843 inp->sctp_features = (*inp_p)->sctp_features; 2844 inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features; 2845 inp->sctp_socket = so; 2846 inp->sctp_frag_point = (*inp_p)->sctp_frag_point; 2847 inp->max_cwnd = (*inp_p)->max_cwnd; 2848 inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off; 2849 inp->ecn_supported = (*inp_p)->ecn_supported; 2850 inp->prsctp_supported = (*inp_p)->prsctp_supported; 2851 inp->auth_supported = (*inp_p)->auth_supported; 2852 inp->asconf_supported = (*inp_p)->asconf_supported; 2853 inp->reconfig_supported = (*inp_p)->reconfig_supported; 2854 inp->nrsack_supported = (*inp_p)->nrsack_supported; 2855 inp->pktdrop_supported = (*inp_p)->pktdrop_supported; 2856 inp->partial_delivery_point = (*inp_p)->partial_delivery_point; 2857 inp->sctp_context = (*inp_p)->sctp_context; 2858 inp->local_strreset_support = (*inp_p)->local_strreset_support; 2859 inp->fibnum = (*inp_p)->fibnum; 2860 inp->inp_starting_point_for_iterator = NULL; 2861 /* 2862 * copy in the authentication parameters from the 2863 * original endpoint 2864 */ 2865 if (inp->sctp_ep.local_hmacs) 2866 sctp_free_hmaclist(inp->sctp_ep.local_hmacs); 2867 inp->sctp_ep.local_hmacs = 2868 sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs); 2869 if (inp->sctp_ep.local_auth_chunks) 2870 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks); 2871 inp->sctp_ep.local_auth_chunks = 2872 sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks); 2873 2874 /* 2875 * Now we must move it from one hash table to 2876 * another and get the tcb in the right place. 2877 */ 2878 2879 /* 2880 * This is where the one-2-one socket is put into 2881 * the accept state waiting for the accept! 2882 */ 2883 if (*stcb) { 2884 SCTP_ADD_SUBSTATE(*stcb, SCTP_STATE_IN_ACCEPT_QUEUE); 2885 } 2886 sctp_move_pcb_and_assoc(*inp_p, inp, *stcb); 2887 2888 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2889 SCTP_TCB_UNLOCK((*stcb)); 2890 2891 sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb, 2892 0); 2893 SCTP_TCB_LOCK((*stcb)); 2894 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2895 2896 2897 /* 2898 * now we must check to see if we were aborted while 2899 * the move was going on and the lock/unlock 2900 * happened. 2901 */ 2902 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 2903 /* 2904 * yep it was, we leave the assoc attached 2905 * to the socket since the sctp_inpcb_free() 2906 * call will send an abort for us. 2907 */ 2908 SCTP_INP_DECR_REF(inp); 2909 return (NULL); 2910 } 2911 SCTP_INP_DECR_REF(inp); 2912 /* Switch over to the new guy */ 2913 *inp_p = inp; 2914 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2915 if (send_int_conf) { 2916 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2917 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2918 } 2919 2920 /* 2921 * Pull it from the incomplete queue and wake the 2922 * guy 2923 */ 2924 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2925 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2926 SCTP_TCB_UNLOCK((*stcb)); 2927 SCTP_SOCKET_LOCK(so, 1); 2928 #endif 2929 soisconnected(so); 2930 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2931 SCTP_TCB_LOCK((*stcb)); 2932 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2933 SCTP_SOCKET_UNLOCK(so, 1); 2934 #endif 2935 return (m); 2936 } 2937 } 2938 if (notification) { 2939 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2940 } 2941 if (send_int_conf) { 2942 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2943 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2944 } 2945 return (m); 2946 } 2947 2948 static void 2949 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED, 2950 struct sctp_tcb *stcb, struct sctp_nets *net) 2951 { 2952 /* cp must not be used, others call this without a c-ack :-) */ 2953 struct sctp_association *asoc; 2954 2955 SCTPDBG(SCTP_DEBUG_INPUT2, 2956 "sctp_handle_cookie_ack: handling COOKIE-ACK\n"); 2957 if ((stcb == NULL) || (net == NULL)) { 2958 return; 2959 } 2960 2961 asoc = &stcb->asoc; 2962 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 2963 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 2964 asoc->overall_error_count, 2965 0, 2966 SCTP_FROM_SCTP_INPUT, 2967 __LINE__); 2968 } 2969 asoc->overall_error_count = 0; 2970 sctp_stop_all_cookie_timers(stcb); 2971 /* process according to association state */ 2972 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) { 2973 /* state change only needed when I am in right state */ 2974 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2975 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 2976 sctp_start_net_timers(stcb); 2977 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2978 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2979 stcb->sctp_ep, stcb, asoc->primary_destination); 2980 2981 } 2982 /* update RTO */ 2983 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 2984 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2985 if (asoc->overall_error_count == 0) { 2986 net->RTO = sctp_calculate_rto(stcb, asoc, net, 2987 &asoc->time_entered, 2988 SCTP_RTT_FROM_NON_DATA); 2989 } 2990 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 2991 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2992 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2993 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 2994 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2995 struct socket *so; 2996 2997 #endif 2998 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2999 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3000 so = SCTP_INP_SO(stcb->sctp_ep); 3001 atomic_add_int(&stcb->asoc.refcnt, 1); 3002 SCTP_TCB_UNLOCK(stcb); 3003 SCTP_SOCKET_LOCK(so, 1); 3004 SCTP_TCB_LOCK(stcb); 3005 atomic_subtract_int(&stcb->asoc.refcnt, 1); 3006 #endif 3007 if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) { 3008 soisconnected(stcb->sctp_socket); 3009 } 3010 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3011 SCTP_SOCKET_UNLOCK(so, 1); 3012 #endif 3013 } 3014 /* 3015 * since we did not send a HB make sure we don't double 3016 * things 3017 */ 3018 net->hb_responded = 1; 3019 3020 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 3021 /* 3022 * We don't need to do the asconf thing, nor hb or 3023 * autoclose if the socket is closed. 3024 */ 3025 goto closed_socket; 3026 } 3027 3028 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 3029 stcb, net); 3030 3031 3032 if (stcb->asoc.sctp_autoclose_ticks && 3033 sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) { 3034 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 3035 stcb->sctp_ep, stcb, NULL); 3036 } 3037 /* 3038 * send ASCONF if parameters are pending and ASCONFs are 3039 * allowed (eg. addresses changed when init/cookie echo were 3040 * in flight) 3041 */ 3042 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) && 3043 (stcb->asoc.asconf_supported == 1) && 3044 (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) { 3045 #ifdef SCTP_TIMER_BASED_ASCONF 3046 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, 3047 stcb->sctp_ep, stcb, 3048 stcb->asoc.primary_destination); 3049 #else 3050 sctp_send_asconf(stcb, stcb->asoc.primary_destination, 3051 SCTP_ADDR_NOT_LOCKED); 3052 #endif 3053 } 3054 } 3055 closed_socket: 3056 /* Toss the cookie if I can */ 3057 sctp_toss_old_cookies(stcb, asoc); 3058 if (!TAILQ_EMPTY(&asoc->sent_queue)) { 3059 /* Restart the timer if we have pending data */ 3060 struct sctp_tmit_chunk *chk; 3061 3062 chk = TAILQ_FIRST(&asoc->sent_queue); 3063 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 3064 } 3065 } 3066 3067 static void 3068 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp, 3069 struct sctp_tcb *stcb) 3070 { 3071 struct sctp_nets *net; 3072 struct sctp_tmit_chunk *lchk; 3073 struct sctp_ecne_chunk bkup; 3074 uint8_t override_bit; 3075 uint32_t tsn, window_data_tsn; 3076 int len; 3077 unsigned int pkt_cnt; 3078 3079 len = ntohs(cp->ch.chunk_length); 3080 if ((len != sizeof(struct sctp_ecne_chunk)) && 3081 (len != sizeof(struct old_sctp_ecne_chunk))) { 3082 return; 3083 } 3084 if (len == sizeof(struct old_sctp_ecne_chunk)) { 3085 /* Its the old format */ 3086 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk)); 3087 bkup.num_pkts_since_cwr = htonl(1); 3088 cp = &bkup; 3089 } 3090 SCTP_STAT_INCR(sctps_recvecne); 3091 tsn = ntohl(cp->tsn); 3092 pkt_cnt = ntohl(cp->num_pkts_since_cwr); 3093 lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead); 3094 if (lchk == NULL) { 3095 window_data_tsn = stcb->asoc.sending_seq - 1; 3096 } else { 3097 window_data_tsn = lchk->rec.data.tsn; 3098 } 3099 3100 /* Find where it was sent to if possible. */ 3101 net = NULL; 3102 TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) { 3103 if (lchk->rec.data.tsn == tsn) { 3104 net = lchk->whoTo; 3105 net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send; 3106 break; 3107 } 3108 if (SCTP_TSN_GT(lchk->rec.data.tsn, tsn)) { 3109 break; 3110 } 3111 } 3112 if (net == NULL) { 3113 /* 3114 * What to do. A previous send of a CWR was possibly lost. 3115 * See how old it is, we may have it marked on the actual 3116 * net. 3117 */ 3118 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 3119 if (tsn == net->last_cwr_tsn) { 3120 /* Found him, send it off */ 3121 break; 3122 } 3123 } 3124 if (net == NULL) { 3125 /* 3126 * If we reach here, we need to send a special CWR 3127 * that says hey, we did this a long time ago and 3128 * you lost the response. 3129 */ 3130 net = TAILQ_FIRST(&stcb->asoc.nets); 3131 if (net == NULL) { 3132 /* TSNH */ 3133 return; 3134 } 3135 override_bit = SCTP_CWR_REDUCE_OVERRIDE; 3136 } else { 3137 override_bit = 0; 3138 } 3139 } else { 3140 override_bit = 0; 3141 } 3142 if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) && 3143 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 3144 /* 3145 * JRS - Use the congestion control given in the pluggable 3146 * CC module 3147 */ 3148 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt); 3149 /* 3150 * We reduce once every RTT. So we will only lower cwnd at 3151 * the next sending seq i.e. the window_data_tsn 3152 */ 3153 net->cwr_window_tsn = window_data_tsn; 3154 net->ecn_ce_pkt_cnt += pkt_cnt; 3155 net->lost_cnt = pkt_cnt; 3156 net->last_cwr_tsn = tsn; 3157 } else { 3158 override_bit |= SCTP_CWR_IN_SAME_WINDOW; 3159 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) && 3160 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 3161 /* 3162 * Another loss in the same window update how many 3163 * marks/packets lost we have had. 3164 */ 3165 int cnt = 1; 3166 3167 if (pkt_cnt > net->lost_cnt) { 3168 /* Should be the case */ 3169 cnt = (pkt_cnt - net->lost_cnt); 3170 net->ecn_ce_pkt_cnt += cnt; 3171 } 3172 net->lost_cnt = pkt_cnt; 3173 net->last_cwr_tsn = tsn; 3174 /* 3175 * Most CC functions will ignore this call, since we 3176 * are in-window yet of the initial CE the peer saw. 3177 */ 3178 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt); 3179 } 3180 } 3181 /* 3182 * We always send a CWR this way if our previous one was lost our 3183 * peer will get an update, or if it is not time again to reduce we 3184 * still get the cwr to the peer. Note we set the override when we 3185 * could not find the TSN on the chunk or the destination network. 3186 */ 3187 sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit); 3188 } 3189 3190 static void 3191 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net) 3192 { 3193 /* 3194 * Here we get a CWR from the peer. We must look in the outqueue and 3195 * make sure that we have a covered ECNE in the control chunk part. 3196 * If so remove it. 3197 */ 3198 struct sctp_tmit_chunk *chk, *nchk; 3199 struct sctp_ecne_chunk *ecne; 3200 int override; 3201 uint32_t cwr_tsn; 3202 3203 cwr_tsn = ntohl(cp->tsn); 3204 override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE; 3205 TAILQ_FOREACH_SAFE(chk, &stcb->asoc.control_send_queue, sctp_next, nchk) { 3206 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) { 3207 continue; 3208 } 3209 if ((override == 0) && (chk->whoTo != net)) { 3210 /* Must be from the right src unless override is set */ 3211 continue; 3212 } 3213 ecne = mtod(chk->data, struct sctp_ecne_chunk *); 3214 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) { 3215 /* this covers this ECNE, we can remove it */ 3216 stcb->asoc.ecn_echo_cnt_onq--; 3217 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, 3218 sctp_next); 3219 stcb->asoc.ctrl_queue_cnt--; 3220 sctp_m_freem(chk->data); 3221 chk->data = NULL; 3222 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3223 if (override == 0) { 3224 break; 3225 } 3226 } 3227 } 3228 } 3229 3230 static void 3231 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED, 3232 struct sctp_tcb *stcb, struct sctp_nets *net) 3233 { 3234 struct sctp_association *asoc; 3235 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3236 struct socket *so; 3237 #endif 3238 3239 SCTPDBG(SCTP_DEBUG_INPUT2, 3240 "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n"); 3241 if (stcb == NULL) 3242 return; 3243 3244 asoc = &stcb->asoc; 3245 /* process according to association state */ 3246 if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 3247 /* unexpected SHUTDOWN-COMPLETE... so ignore... */ 3248 SCTPDBG(SCTP_DEBUG_INPUT2, 3249 "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n"); 3250 SCTP_TCB_UNLOCK(stcb); 3251 return; 3252 } 3253 /* notify upper layer protocol */ 3254 if (stcb->sctp_socket) { 3255 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 3256 } 3257 #ifdef INVARIANTS 3258 if (!TAILQ_EMPTY(&asoc->send_queue) || 3259 !TAILQ_EMPTY(&asoc->sent_queue) || 3260 sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) { 3261 panic("Queues are not empty when handling SHUTDOWN-COMPLETE"); 3262 } 3263 #endif 3264 /* stop the timer */ 3265 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, 3266 SCTP_FROM_SCTP_INPUT + SCTP_LOC_24); 3267 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 3268 /* free the TCB */ 3269 SCTPDBG(SCTP_DEBUG_INPUT2, 3270 "sctp_handle_shutdown_complete: calls free-asoc\n"); 3271 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3272 so = SCTP_INP_SO(stcb->sctp_ep); 3273 atomic_add_int(&stcb->asoc.refcnt, 1); 3274 SCTP_TCB_UNLOCK(stcb); 3275 SCTP_SOCKET_LOCK(so, 1); 3276 SCTP_TCB_LOCK(stcb); 3277 atomic_subtract_int(&stcb->asoc.refcnt, 1); 3278 #endif 3279 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 3280 SCTP_FROM_SCTP_INPUT + SCTP_LOC_25); 3281 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3282 SCTP_SOCKET_UNLOCK(so, 1); 3283 #endif 3284 return; 3285 } 3286 3287 static int 3288 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc, 3289 struct sctp_nets *net, uint8_t flg) 3290 { 3291 switch (desc->chunk_type) { 3292 case SCTP_DATA: 3293 /* find the tsn to resend (possibly */ 3294 { 3295 uint32_t tsn; 3296 struct sctp_tmit_chunk *tp1; 3297 3298 tsn = ntohl(desc->tsn_ifany); 3299 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3300 if (tp1->rec.data.tsn == tsn) { 3301 /* found it */ 3302 break; 3303 } 3304 if (SCTP_TSN_GT(tp1->rec.data.tsn, tsn)) { 3305 /* not found */ 3306 tp1 = NULL; 3307 break; 3308 } 3309 } 3310 if (tp1 == NULL) { 3311 /* 3312 * Do it the other way , aka without paying 3313 * attention to queue seq order. 3314 */ 3315 SCTP_STAT_INCR(sctps_pdrpdnfnd); 3316 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3317 if (tp1->rec.data.tsn == tsn) { 3318 /* found it */ 3319 break; 3320 } 3321 } 3322 } 3323 if (tp1 == NULL) { 3324 SCTP_STAT_INCR(sctps_pdrptsnnf); 3325 } 3326 if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) { 3327 uint8_t *ddp; 3328 3329 if (((flg & SCTP_BADCRC) == 0) && 3330 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3331 return (0); 3332 } 3333 if ((stcb->asoc.peers_rwnd == 0) && 3334 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3335 SCTP_STAT_INCR(sctps_pdrpdiwnp); 3336 return (0); 3337 } 3338 if (stcb->asoc.peers_rwnd == 0 && 3339 (flg & SCTP_FROM_MIDDLE_BOX)) { 3340 SCTP_STAT_INCR(sctps_pdrpdizrw); 3341 return (0); 3342 } 3343 ddp = (uint8_t *)(mtod(tp1->data, caddr_t)+ 3344 sizeof(struct sctp_data_chunk)); 3345 { 3346 unsigned int iii; 3347 3348 for (iii = 0; iii < sizeof(desc->data_bytes); 3349 iii++) { 3350 if (ddp[iii] != desc->data_bytes[iii]) { 3351 SCTP_STAT_INCR(sctps_pdrpbadd); 3352 return (-1); 3353 } 3354 } 3355 } 3356 3357 if (tp1->do_rtt) { 3358 /* 3359 * this guy had a RTO calculation 3360 * pending on it, cancel it 3361 */ 3362 if (tp1->whoTo->rto_needed == 0) { 3363 tp1->whoTo->rto_needed = 1; 3364 } 3365 tp1->do_rtt = 0; 3366 } 3367 SCTP_STAT_INCR(sctps_pdrpmark); 3368 if (tp1->sent != SCTP_DATAGRAM_RESEND) 3369 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3370 /* 3371 * mark it as if we were doing a FR, since 3372 * we will be getting gap ack reports behind 3373 * the info from the router. 3374 */ 3375 tp1->rec.data.doing_fast_retransmit = 1; 3376 /* 3377 * mark the tsn with what sequences can 3378 * cause a new FR. 3379 */ 3380 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) { 3381 tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq; 3382 } else { 3383 tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.tsn; 3384 } 3385 3386 /* restart the timer */ 3387 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3388 stcb, tp1->whoTo, 3389 SCTP_FROM_SCTP_INPUT + SCTP_LOC_26); 3390 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3391 stcb, tp1->whoTo); 3392 3393 /* fix counts and things */ 3394 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 3395 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP, 3396 tp1->whoTo->flight_size, 3397 tp1->book_size, 3398 (uint32_t)(uintptr_t)stcb, 3399 tp1->rec.data.tsn); 3400 } 3401 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3402 sctp_flight_size_decrease(tp1); 3403 sctp_total_flight_decrease(stcb, tp1); 3404 } 3405 tp1->sent = SCTP_DATAGRAM_RESEND; 3406 } { 3407 /* audit code */ 3408 unsigned int audit; 3409 3410 audit = 0; 3411 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3412 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3413 audit++; 3414 } 3415 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue, 3416 sctp_next) { 3417 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3418 audit++; 3419 } 3420 if (audit != stcb->asoc.sent_queue_retran_cnt) { 3421 SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n", 3422 audit, stcb->asoc.sent_queue_retran_cnt); 3423 #ifndef SCTP_AUDITING_ENABLED 3424 stcb->asoc.sent_queue_retran_cnt = audit; 3425 #endif 3426 } 3427 } 3428 } 3429 break; 3430 case SCTP_ASCONF: 3431 { 3432 struct sctp_tmit_chunk *asconf; 3433 3434 TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue, 3435 sctp_next) { 3436 if (asconf->rec.chunk_id.id == SCTP_ASCONF) { 3437 break; 3438 } 3439 } 3440 if (asconf) { 3441 if (asconf->sent != SCTP_DATAGRAM_RESEND) 3442 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3443 asconf->sent = SCTP_DATAGRAM_RESEND; 3444 asconf->snd_count--; 3445 } 3446 } 3447 break; 3448 case SCTP_INITIATION: 3449 /* resend the INIT */ 3450 stcb->asoc.dropped_special_cnt++; 3451 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) { 3452 /* 3453 * If we can get it in, in a few attempts we do 3454 * this, otherwise we let the timer fire. 3455 */ 3456 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, 3457 stcb, net, 3458 SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 3459 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 3460 } 3461 break; 3462 case SCTP_SELECTIVE_ACK: 3463 case SCTP_NR_SELECTIVE_ACK: 3464 /* resend the sack */ 3465 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED); 3466 break; 3467 case SCTP_HEARTBEAT_REQUEST: 3468 /* resend a demand HB */ 3469 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) { 3470 /* 3471 * Only retransmit if we KNOW we wont destroy the 3472 * tcb 3473 */ 3474 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 3475 } 3476 break; 3477 case SCTP_SHUTDOWN: 3478 sctp_send_shutdown(stcb, net); 3479 break; 3480 case SCTP_SHUTDOWN_ACK: 3481 sctp_send_shutdown_ack(stcb, net); 3482 break; 3483 case SCTP_COOKIE_ECHO: 3484 { 3485 struct sctp_tmit_chunk *cookie; 3486 3487 cookie = NULL; 3488 TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, 3489 sctp_next) { 3490 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) { 3491 break; 3492 } 3493 } 3494 if (cookie) { 3495 if (cookie->sent != SCTP_DATAGRAM_RESEND) 3496 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3497 cookie->sent = SCTP_DATAGRAM_RESEND; 3498 sctp_stop_all_cookie_timers(stcb); 3499 } 3500 } 3501 break; 3502 case SCTP_COOKIE_ACK: 3503 sctp_send_cookie_ack(stcb); 3504 break; 3505 case SCTP_ASCONF_ACK: 3506 /* resend last asconf ack */ 3507 sctp_send_asconf_ack(stcb); 3508 break; 3509 case SCTP_IFORWARD_CUM_TSN: 3510 case SCTP_FORWARD_CUM_TSN: 3511 send_forward_tsn(stcb, &stcb->asoc); 3512 break; 3513 /* can't do anything with these */ 3514 case SCTP_PACKET_DROPPED: 3515 case SCTP_INITIATION_ACK: /* this should not happen */ 3516 case SCTP_HEARTBEAT_ACK: 3517 case SCTP_ABORT_ASSOCIATION: 3518 case SCTP_OPERATION_ERROR: 3519 case SCTP_SHUTDOWN_COMPLETE: 3520 case SCTP_ECN_ECHO: 3521 case SCTP_ECN_CWR: 3522 default: 3523 break; 3524 } 3525 return (0); 3526 } 3527 3528 void 3529 sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list) 3530 { 3531 uint32_t i; 3532 uint16_t temp; 3533 3534 /* 3535 * We set things to 0xffffffff since this is the last delivered 3536 * sequence and we will be sending in 0 after the reset. 3537 */ 3538 3539 if (number_entries) { 3540 for (i = 0; i < number_entries; i++) { 3541 temp = ntohs(list[i]); 3542 if (temp >= stcb->asoc.streamincnt) { 3543 continue; 3544 } 3545 stcb->asoc.strmin[temp].last_mid_delivered = 0xffffffff; 3546 } 3547 } else { 3548 list = NULL; 3549 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3550 stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff; 3551 } 3552 } 3553 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3554 } 3555 3556 static void 3557 sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list) 3558 { 3559 uint32_t i; 3560 uint16_t temp; 3561 3562 if (number_entries > 0) { 3563 for (i = 0; i < number_entries; i++) { 3564 temp = ntohs(list[i]); 3565 if (temp >= stcb->asoc.streamoutcnt) { 3566 /* no such stream */ 3567 continue; 3568 } 3569 stcb->asoc.strmout[temp].next_mid_ordered = 0; 3570 stcb->asoc.strmout[temp].next_mid_unordered = 0; 3571 } 3572 } else { 3573 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3574 stcb->asoc.strmout[i].next_mid_ordered = 0; 3575 stcb->asoc.strmout[i].next_mid_unordered = 0; 3576 } 3577 } 3578 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3579 } 3580 3581 static void 3582 sctp_reset_clear_pending(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list) 3583 { 3584 uint32_t i; 3585 uint16_t temp; 3586 3587 if (number_entries > 0) { 3588 for (i = 0; i < number_entries; i++) { 3589 temp = ntohs(list[i]); 3590 if (temp >= stcb->asoc.streamoutcnt) { 3591 /* no such stream */ 3592 continue; 3593 } 3594 stcb->asoc.strmout[temp].state = SCTP_STREAM_OPEN; 3595 } 3596 } else { 3597 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3598 stcb->asoc.strmout[i].state = SCTP_STREAM_OPEN; 3599 } 3600 } 3601 } 3602 3603 3604 struct sctp_stream_reset_request * 3605 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk) 3606 { 3607 struct sctp_association *asoc; 3608 struct sctp_chunkhdr *ch; 3609 struct sctp_stream_reset_request *r; 3610 struct sctp_tmit_chunk *chk; 3611 int len, clen; 3612 3613 asoc = &stcb->asoc; 3614 if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 3615 asoc->stream_reset_outstanding = 0; 3616 return (NULL); 3617 } 3618 if (stcb->asoc.str_reset == NULL) { 3619 asoc->stream_reset_outstanding = 0; 3620 return (NULL); 3621 } 3622 chk = stcb->asoc.str_reset; 3623 if (chk->data == NULL) { 3624 return (NULL); 3625 } 3626 if (bchk) { 3627 /* he wants a copy of the chk pointer */ 3628 *bchk = chk; 3629 } 3630 clen = chk->send_size; 3631 ch = mtod(chk->data, struct sctp_chunkhdr *); 3632 r = (struct sctp_stream_reset_request *)(ch + 1); 3633 if (ntohl(r->request_seq) == seq) { 3634 /* found it */ 3635 return (r); 3636 } 3637 len = SCTP_SIZE32(ntohs(r->ph.param_length)); 3638 if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) { 3639 /* move to the next one, there can only be a max of two */ 3640 r = (struct sctp_stream_reset_request *)((caddr_t)r + len); 3641 if (ntohl(r->request_seq) == seq) { 3642 return (r); 3643 } 3644 } 3645 /* that seq is not here */ 3646 return (NULL); 3647 } 3648 3649 static void 3650 sctp_clean_up_stream_reset(struct sctp_tcb *stcb) 3651 { 3652 struct sctp_association *asoc; 3653 struct sctp_tmit_chunk *chk; 3654 3655 asoc = &stcb->asoc; 3656 chk = asoc->str_reset; 3657 if (chk == NULL) { 3658 return; 3659 } 3660 asoc->str_reset = NULL; 3661 sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, 3662 chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_28); 3663 TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next); 3664 asoc->ctrl_queue_cnt--; 3665 if (chk->data) { 3666 sctp_m_freem(chk->data); 3667 chk->data = NULL; 3668 } 3669 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3670 } 3671 3672 3673 static int 3674 sctp_handle_stream_reset_response(struct sctp_tcb *stcb, 3675 uint32_t seq, uint32_t action, 3676 struct sctp_stream_reset_response *respin) 3677 { 3678 uint16_t type; 3679 int lparam_len; 3680 struct sctp_association *asoc = &stcb->asoc; 3681 struct sctp_tmit_chunk *chk; 3682 struct sctp_stream_reset_request *req_param; 3683 struct sctp_stream_reset_out_request *req_out_param; 3684 struct sctp_stream_reset_in_request *req_in_param; 3685 uint32_t number_entries; 3686 3687 if (asoc->stream_reset_outstanding == 0) { 3688 /* duplicate */ 3689 return (0); 3690 } 3691 if (seq == stcb->asoc.str_reset_seq_out) { 3692 req_param = sctp_find_stream_reset(stcb, seq, &chk); 3693 if (req_param != NULL) { 3694 stcb->asoc.str_reset_seq_out++; 3695 type = ntohs(req_param->ph.param_type); 3696 lparam_len = ntohs(req_param->ph.param_length); 3697 if (type == SCTP_STR_RESET_OUT_REQUEST) { 3698 int no_clear = 0; 3699 3700 req_out_param = (struct sctp_stream_reset_out_request *)req_param; 3701 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t); 3702 asoc->stream_reset_out_is_outstanding = 0; 3703 if (asoc->stream_reset_outstanding) 3704 asoc->stream_reset_outstanding--; 3705 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3706 /* do it */ 3707 sctp_reset_out_streams(stcb, number_entries, req_out_param->list_of_streams); 3708 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3709 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3710 } else if (action == SCTP_STREAM_RESET_RESULT_IN_PROGRESS) { 3711 /* 3712 * Set it up so we don't stop 3713 * retransmitting 3714 */ 3715 asoc->stream_reset_outstanding++; 3716 stcb->asoc.str_reset_seq_out--; 3717 asoc->stream_reset_out_is_outstanding = 1; 3718 no_clear = 1; 3719 } else { 3720 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3721 } 3722 if (no_clear == 0) { 3723 sctp_reset_clear_pending(stcb, number_entries, req_out_param->list_of_streams); 3724 } 3725 } else if (type == SCTP_STR_RESET_IN_REQUEST) { 3726 req_in_param = (struct sctp_stream_reset_in_request *)req_param; 3727 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t); 3728 if (asoc->stream_reset_outstanding) 3729 asoc->stream_reset_outstanding--; 3730 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3731 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb, 3732 number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3733 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3734 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb, 3735 number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3736 } 3737 } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) { 3738 /* Ok we now may have more streams */ 3739 int num_stream; 3740 3741 num_stream = stcb->asoc.strm_pending_add_size; 3742 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) { 3743 /* TSNH */ 3744 num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt; 3745 } 3746 stcb->asoc.strm_pending_add_size = 0; 3747 if (asoc->stream_reset_outstanding) 3748 asoc->stream_reset_outstanding--; 3749 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3750 /* Put the new streams into effect */ 3751 int i; 3752 3753 for (i = asoc->streamoutcnt; i < (asoc->streamoutcnt + num_stream); i++) { 3754 asoc->strmout[i].state = SCTP_STREAM_OPEN; 3755 } 3756 asoc->streamoutcnt += num_stream; 3757 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 3758 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3759 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3760 SCTP_STREAM_CHANGE_DENIED); 3761 } else { 3762 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3763 SCTP_STREAM_CHANGE_FAILED); 3764 } 3765 } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) { 3766 if (asoc->stream_reset_outstanding) 3767 asoc->stream_reset_outstanding--; 3768 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3769 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3770 SCTP_STREAM_CHANGE_DENIED); 3771 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3772 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3773 SCTP_STREAM_CHANGE_FAILED); 3774 } 3775 } else if (type == SCTP_STR_RESET_TSN_REQUEST) { 3776 /** 3777 * a) Adopt the new in tsn. 3778 * b) reset the map 3779 * c) Adopt the new out-tsn 3780 */ 3781 struct sctp_stream_reset_response_tsn *resp; 3782 struct sctp_forward_tsn_chunk fwdtsn; 3783 int abort_flag = 0; 3784 3785 if (respin == NULL) { 3786 /* huh ? */ 3787 return (0); 3788 } 3789 if (ntohs(respin->ph.param_length) < sizeof(struct sctp_stream_reset_response_tsn)) { 3790 return (0); 3791 } 3792 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3793 resp = (struct sctp_stream_reset_response_tsn *)respin; 3794 asoc->stream_reset_outstanding--; 3795 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3796 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3797 fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1); 3798 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3799 if (abort_flag) { 3800 return (1); 3801 } 3802 stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1); 3803 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3804 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3805 } 3806 3807 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 3808 stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn); 3809 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 3810 3811 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map; 3812 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size); 3813 3814 stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn); 3815 stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn; 3816 3817 sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL); 3818 sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL); 3819 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0); 3820 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3821 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3822 SCTP_ASSOC_RESET_DENIED); 3823 } else { 3824 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3825 SCTP_ASSOC_RESET_FAILED); 3826 } 3827 } 3828 /* get rid of the request and get the request flags */ 3829 if (asoc->stream_reset_outstanding == 0) { 3830 sctp_clean_up_stream_reset(stcb); 3831 } 3832 } 3833 } 3834 if (asoc->stream_reset_outstanding == 0) { 3835 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED); 3836 } 3837 return (0); 3838 } 3839 3840 static void 3841 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb, 3842 struct sctp_tmit_chunk *chk, 3843 struct sctp_stream_reset_in_request *req, int trunc) 3844 { 3845 uint32_t seq; 3846 int len, i; 3847 int number_entries; 3848 uint16_t temp; 3849 3850 /* 3851 * peer wants me to send a str-reset to him for my outgoing seq's if 3852 * seq_in is right. 3853 */ 3854 struct sctp_association *asoc = &stcb->asoc; 3855 3856 seq = ntohl(req->request_seq); 3857 if (asoc->str_reset_seq_in == seq) { 3858 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3859 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3860 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3861 } else if (trunc) { 3862 /* Can't do it, since they exceeded our buffer size */ 3863 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3864 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) { 3865 len = ntohs(req->ph.param_length); 3866 number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t)); 3867 if (number_entries) { 3868 for (i = 0; i < number_entries; i++) { 3869 temp = ntohs(req->list_of_streams[i]); 3870 if (temp >= stcb->asoc.streamoutcnt) { 3871 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3872 goto bad_boy; 3873 } 3874 req->list_of_streams[i] = temp; 3875 } 3876 for (i = 0; i < number_entries; i++) { 3877 if (stcb->asoc.strmout[req->list_of_streams[i]].state == SCTP_STREAM_OPEN) { 3878 stcb->asoc.strmout[req->list_of_streams[i]].state = SCTP_STREAM_RESET_PENDING; 3879 } 3880 } 3881 } else { 3882 /* Its all */ 3883 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3884 if (stcb->asoc.strmout[i].state == SCTP_STREAM_OPEN) 3885 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_PENDING; 3886 } 3887 } 3888 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3889 } else { 3890 /* Can't do it, since we have sent one out */ 3891 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 3892 } 3893 bad_boy: 3894 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3895 asoc->str_reset_seq_in++; 3896 } else if (asoc->str_reset_seq_in - 1 == seq) { 3897 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3898 } else if (asoc->str_reset_seq_in - 2 == seq) { 3899 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3900 } else { 3901 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3902 } 3903 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED); 3904 } 3905 3906 static int 3907 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb, 3908 struct sctp_tmit_chunk *chk, 3909 struct sctp_stream_reset_tsn_request *req) 3910 { 3911 /* reset all in and out and update the tsn */ 3912 /* 3913 * A) reset my str-seq's on in and out. B) Select a receive next, 3914 * and set cum-ack to it. Also process this selected number as a 3915 * fwd-tsn as well. C) set in the response my next sending seq. 3916 */ 3917 struct sctp_forward_tsn_chunk fwdtsn; 3918 struct sctp_association *asoc = &stcb->asoc; 3919 int abort_flag = 0; 3920 uint32_t seq; 3921 3922 seq = ntohl(req->request_seq); 3923 if (asoc->str_reset_seq_in == seq) { 3924 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3925 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 3926 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3927 } else { 3928 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3929 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3930 fwdtsn.ch.chunk_flags = 0; 3931 fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1); 3932 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3933 if (abort_flag) { 3934 return (1); 3935 } 3936 asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA; 3937 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3938 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3939 } 3940 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map; 3941 asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1; 3942 memset(asoc->mapping_array, 0, asoc->mapping_array_size); 3943 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 3944 memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size); 3945 atomic_add_int(&asoc->sending_seq, 1); 3946 /* save off historical data for retrans */ 3947 asoc->last_sending_seq[1] = asoc->last_sending_seq[0]; 3948 asoc->last_sending_seq[0] = asoc->sending_seq; 3949 asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0]; 3950 asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn; 3951 sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL); 3952 sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL); 3953 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3954 sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0); 3955 } 3956 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3957 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3958 asoc->str_reset_seq_in++; 3959 } else if (asoc->str_reset_seq_in - 1 == seq) { 3960 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3961 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3962 } else if (asoc->str_reset_seq_in - 2 == seq) { 3963 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1], 3964 asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]); 3965 } else { 3966 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3967 } 3968 return (0); 3969 } 3970 3971 static void 3972 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb, 3973 struct sctp_tmit_chunk *chk, 3974 struct sctp_stream_reset_out_request *req, int trunc) 3975 { 3976 uint32_t seq, tsn; 3977 int number_entries, len; 3978 struct sctp_association *asoc = &stcb->asoc; 3979 3980 seq = ntohl(req->request_seq); 3981 3982 /* now if its not a duplicate we process it */ 3983 if (asoc->str_reset_seq_in == seq) { 3984 len = ntohs(req->ph.param_length); 3985 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t)); 3986 /* 3987 * the sender is resetting, handle the list issue.. we must 3988 * a) verify if we can do the reset, if so no problem b) If 3989 * we can't do the reset we must copy the request. c) queue 3990 * it, and setup the data in processor to trigger it off 3991 * when needed and dequeue all the queued data. 3992 */ 3993 tsn = ntohl(req->send_reset_at_tsn); 3994 3995 /* move the reset action back one */ 3996 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3997 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3998 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3999 } else if (trunc) { 4000 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4001 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) { 4002 /* we can do it now */ 4003 sctp_reset_in_stream(stcb, number_entries, req->list_of_streams); 4004 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 4005 } else { 4006 /* 4007 * we must queue it up and thus wait for the TSN's 4008 * to arrive that are at or before tsn 4009 */ 4010 struct sctp_stream_reset_list *liste; 4011 int siz; 4012 4013 siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t)); 4014 SCTP_MALLOC(liste, struct sctp_stream_reset_list *, 4015 siz, SCTP_M_STRESET); 4016 if (liste == NULL) { 4017 /* gak out of memory */ 4018 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4019 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4020 return; 4021 } 4022 liste->seq = seq; 4023 liste->tsn = tsn; 4024 liste->number_entries = number_entries; 4025 memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t)); 4026 TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp); 4027 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_IN_PROGRESS; 4028 } 4029 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4030 asoc->str_reset_seq_in++; 4031 } else if ((asoc->str_reset_seq_in - 1) == seq) { 4032 /* 4033 * one seq back, just echo back last action since my 4034 * response was lost. 4035 */ 4036 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4037 } else if ((asoc->str_reset_seq_in - 2) == seq) { 4038 /* 4039 * two seq back, just echo back last action since my 4040 * response was lost. 4041 */ 4042 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 4043 } else { 4044 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 4045 } 4046 } 4047 4048 static void 4049 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 4050 struct sctp_stream_reset_add_strm *str_add) 4051 { 4052 /* 4053 * Peer is requesting to add more streams. If its within our 4054 * max-streams we will allow it. 4055 */ 4056 uint32_t num_stream, i; 4057 uint32_t seq; 4058 struct sctp_association *asoc = &stcb->asoc; 4059 struct sctp_queued_to_read *ctl, *nctl; 4060 4061 /* Get the number. */ 4062 seq = ntohl(str_add->request_seq); 4063 num_stream = ntohs(str_add->number_of_streams); 4064 /* Now what would be the new total? */ 4065 if (asoc->str_reset_seq_in == seq) { 4066 num_stream += stcb->asoc.streamincnt; 4067 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 4068 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 4069 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4070 } else if ((num_stream > stcb->asoc.max_inbound_streams) || 4071 (num_stream > 0xffff)) { 4072 /* We must reject it they ask for to many */ 4073 denied: 4074 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4075 } else { 4076 /* Ok, we can do that :-) */ 4077 struct sctp_stream_in *oldstrm; 4078 4079 /* save off the old */ 4080 oldstrm = stcb->asoc.strmin; 4081 SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *, 4082 (num_stream * sizeof(struct sctp_stream_in)), 4083 SCTP_M_STRMI); 4084 if (stcb->asoc.strmin == NULL) { 4085 stcb->asoc.strmin = oldstrm; 4086 goto denied; 4087 } 4088 /* copy off the old data */ 4089 for (i = 0; i < stcb->asoc.streamincnt; i++) { 4090 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 4091 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue); 4092 stcb->asoc.strmin[i].sid = i; 4093 stcb->asoc.strmin[i].last_mid_delivered = oldstrm[i].last_mid_delivered; 4094 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started; 4095 stcb->asoc.strmin[i].pd_api_started = oldstrm[i].pd_api_started; 4096 /* now anything on those queues? */ 4097 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next_instrm, nctl) { 4098 TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next_instrm); 4099 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next_instrm); 4100 } 4101 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].uno_inqueue, next_instrm, nctl) { 4102 TAILQ_REMOVE(&oldstrm[i].uno_inqueue, ctl, next_instrm); 4103 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].uno_inqueue, ctl, next_instrm); 4104 } 4105 } 4106 /* Init the new streams */ 4107 for (i = stcb->asoc.streamincnt; i < num_stream; i++) { 4108 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 4109 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue); 4110 stcb->asoc.strmin[i].sid = i; 4111 stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff; 4112 stcb->asoc.strmin[i].pd_api_started = 0; 4113 stcb->asoc.strmin[i].delivery_started = 0; 4114 } 4115 SCTP_FREE(oldstrm, SCTP_M_STRMI); 4116 /* update the size */ 4117 stcb->asoc.streamincnt = num_stream; 4118 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 4119 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 4120 } 4121 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4122 asoc->str_reset_seq_in++; 4123 } else if ((asoc->str_reset_seq_in - 1) == seq) { 4124 /* 4125 * one seq back, just echo back last action since my 4126 * response was lost. 4127 */ 4128 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4129 } else if ((asoc->str_reset_seq_in - 2) == seq) { 4130 /* 4131 * two seq back, just echo back last action since my 4132 * response was lost. 4133 */ 4134 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 4135 } else { 4136 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 4137 4138 } 4139 } 4140 4141 static void 4142 sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 4143 struct sctp_stream_reset_add_strm *str_add) 4144 { 4145 /* 4146 * Peer is requesting to add more streams. If its within our 4147 * max-streams we will allow it. 4148 */ 4149 uint16_t num_stream; 4150 uint32_t seq; 4151 struct sctp_association *asoc = &stcb->asoc; 4152 4153 /* Get the number. */ 4154 seq = ntohl(str_add->request_seq); 4155 num_stream = ntohs(str_add->number_of_streams); 4156 /* Now what would be the new total? */ 4157 if (asoc->str_reset_seq_in == seq) { 4158 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 4159 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 4160 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4161 } else if (stcb->asoc.stream_reset_outstanding) { 4162 /* We must reject it we have something pending */ 4163 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 4164 } else { 4165 /* Ok, we can do that :-) */ 4166 int mychk; 4167 4168 mychk = stcb->asoc.streamoutcnt; 4169 mychk += num_stream; 4170 if (mychk < 0x10000) { 4171 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 4172 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 1, num_stream, 0, 1)) { 4173 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4174 } 4175 } else { 4176 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4177 } 4178 } 4179 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]); 4180 asoc->str_reset_seq_in++; 4181 } else if ((asoc->str_reset_seq_in - 1) == seq) { 4182 /* 4183 * one seq back, just echo back last action since my 4184 * response was lost. 4185 */ 4186 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4187 } else if ((asoc->str_reset_seq_in - 2) == seq) { 4188 /* 4189 * two seq back, just echo back last action since my 4190 * response was lost. 4191 */ 4192 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 4193 } else { 4194 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 4195 } 4196 } 4197 4198 #ifdef __GNUC__ 4199 __attribute__((noinline)) 4200 #endif 4201 static int 4202 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset, 4203 struct sctp_chunkhdr *ch_req) 4204 { 4205 uint16_t remaining_length, param_len, ptype; 4206 struct sctp_paramhdr pstore; 4207 uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE]; 4208 uint32_t seq = 0; 4209 int num_req = 0; 4210 int trunc = 0; 4211 struct sctp_tmit_chunk *chk; 4212 struct sctp_chunkhdr *ch; 4213 struct sctp_paramhdr *ph; 4214 int ret_code = 0; 4215 int num_param = 0; 4216 4217 /* now it may be a reset or a reset-response */ 4218 remaining_length = ntohs(ch_req->chunk_length) - sizeof(struct sctp_chunkhdr); 4219 4220 /* setup for adding the response */ 4221 sctp_alloc_a_chunk(stcb, chk); 4222 if (chk == NULL) { 4223 return (ret_code); 4224 } 4225 chk->copy_by_ref = 0; 4226 chk->rec.chunk_id.id = SCTP_STREAM_RESET; 4227 chk->rec.chunk_id.can_take_data = 0; 4228 chk->flags = 0; 4229 chk->asoc = &stcb->asoc; 4230 chk->no_fr_allowed = 0; 4231 chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr); 4232 chk->book_size_scale = 0; 4233 chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA); 4234 if (chk->data == NULL) { 4235 strres_nochunk: 4236 if (chk->data) { 4237 sctp_m_freem(chk->data); 4238 chk->data = NULL; 4239 } 4240 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 4241 return (ret_code); 4242 } 4243 SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD); 4244 4245 /* setup chunk parameters */ 4246 chk->sent = SCTP_DATAGRAM_UNSENT; 4247 chk->snd_count = 0; 4248 chk->whoTo = NULL; 4249 4250 ch = mtod(chk->data, struct sctp_chunkhdr *); 4251 ch->chunk_type = SCTP_STREAM_RESET; 4252 ch->chunk_flags = 0; 4253 ch->chunk_length = htons(chk->send_size); 4254 SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size); 4255 offset += sizeof(struct sctp_chunkhdr); 4256 while (remaining_length >= sizeof(struct sctp_paramhdr)) { 4257 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *)&pstore); 4258 if (ph == NULL) { 4259 /* TSNH */ 4260 break; 4261 } 4262 param_len = ntohs(ph->param_length); 4263 if ((param_len > remaining_length) || 4264 (param_len < (sizeof(struct sctp_paramhdr) + sizeof(uint32_t)))) { 4265 /* bad parameter length */ 4266 break; 4267 } 4268 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, sizeof(cstore)), 4269 (uint8_t *)&cstore); 4270 if (ph == NULL) { 4271 /* TSNH */ 4272 break; 4273 } 4274 ptype = ntohs(ph->param_type); 4275 num_param++; 4276 if (param_len > sizeof(cstore)) { 4277 trunc = 1; 4278 } else { 4279 trunc = 0; 4280 } 4281 if (num_param > SCTP_MAX_RESET_PARAMS) { 4282 /* hit the max of parameters already sorry.. */ 4283 break; 4284 } 4285 if (ptype == SCTP_STR_RESET_OUT_REQUEST) { 4286 struct sctp_stream_reset_out_request *req_out; 4287 4288 if (param_len < sizeof(struct sctp_stream_reset_out_request)) { 4289 break; 4290 } 4291 req_out = (struct sctp_stream_reset_out_request *)ph; 4292 num_req++; 4293 if (stcb->asoc.stream_reset_outstanding) { 4294 seq = ntohl(req_out->response_seq); 4295 if (seq == stcb->asoc.str_reset_seq_out) { 4296 /* implicit ack */ 4297 (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL); 4298 } 4299 } 4300 sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc); 4301 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) { 4302 struct sctp_stream_reset_add_strm *str_add; 4303 4304 if (param_len < sizeof(struct sctp_stream_reset_add_strm)) { 4305 break; 4306 } 4307 str_add = (struct sctp_stream_reset_add_strm *)ph; 4308 num_req++; 4309 sctp_handle_str_reset_add_strm(stcb, chk, str_add); 4310 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) { 4311 struct sctp_stream_reset_add_strm *str_add; 4312 4313 if (param_len < sizeof(struct sctp_stream_reset_add_strm)) { 4314 break; 4315 } 4316 str_add = (struct sctp_stream_reset_add_strm *)ph; 4317 num_req++; 4318 sctp_handle_str_reset_add_out_strm(stcb, chk, str_add); 4319 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) { 4320 struct sctp_stream_reset_in_request *req_in; 4321 4322 num_req++; 4323 req_in = (struct sctp_stream_reset_in_request *)ph; 4324 sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc); 4325 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) { 4326 struct sctp_stream_reset_tsn_request *req_tsn; 4327 4328 num_req++; 4329 req_tsn = (struct sctp_stream_reset_tsn_request *)ph; 4330 if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) { 4331 ret_code = 1; 4332 goto strres_nochunk; 4333 } 4334 /* no more */ 4335 break; 4336 } else if (ptype == SCTP_STR_RESET_RESPONSE) { 4337 struct sctp_stream_reset_response *resp; 4338 uint32_t result; 4339 4340 if (param_len < sizeof(struct sctp_stream_reset_response)) { 4341 break; 4342 } 4343 resp = (struct sctp_stream_reset_response *)ph; 4344 seq = ntohl(resp->response_seq); 4345 result = ntohl(resp->result); 4346 if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) { 4347 ret_code = 1; 4348 goto strres_nochunk; 4349 } 4350 } else { 4351 break; 4352 } 4353 offset += SCTP_SIZE32(param_len); 4354 if (remaining_length >= SCTP_SIZE32(param_len)) { 4355 remaining_length -= SCTP_SIZE32(param_len); 4356 } else { 4357 remaining_length = 0; 4358 } 4359 } 4360 if (num_req == 0) { 4361 /* we have no response free the stuff */ 4362 goto strres_nochunk; 4363 } 4364 /* ok we have a chunk to link in */ 4365 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, 4366 chk, 4367 sctp_next); 4368 stcb->asoc.ctrl_queue_cnt++; 4369 return (ret_code); 4370 } 4371 4372 /* 4373 * Handle a router or endpoints report of a packet loss, there are two ways 4374 * to handle this, either we get the whole packet and must disect it 4375 * ourselves (possibly with truncation and or corruption) or it is a summary 4376 * from a middle box that did the disectting for us. 4377 */ 4378 static void 4379 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp, 4380 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 4381 { 4382 uint32_t bottle_bw, on_queue; 4383 uint16_t trunc_len; 4384 unsigned int chlen; 4385 unsigned int at; 4386 struct sctp_chunk_desc desc; 4387 struct sctp_chunkhdr *ch; 4388 4389 chlen = ntohs(cp->ch.chunk_length); 4390 chlen -= sizeof(struct sctp_pktdrop_chunk); 4391 /* XXX possible chlen underflow */ 4392 if (chlen == 0) { 4393 ch = NULL; 4394 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) 4395 SCTP_STAT_INCR(sctps_pdrpbwrpt); 4396 } else { 4397 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr)); 4398 chlen -= sizeof(struct sctphdr); 4399 /* XXX possible chlen underflow */ 4400 memset(&desc, 0, sizeof(desc)); 4401 } 4402 trunc_len = (uint16_t)ntohs(cp->trunc_len); 4403 if (trunc_len > limit) { 4404 trunc_len = limit; 4405 } 4406 4407 /* now the chunks themselves */ 4408 while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) { 4409 desc.chunk_type = ch->chunk_type; 4410 /* get amount we need to move */ 4411 at = ntohs(ch->chunk_length); 4412 if (at < sizeof(struct sctp_chunkhdr)) { 4413 /* corrupt chunk, maybe at the end? */ 4414 SCTP_STAT_INCR(sctps_pdrpcrupt); 4415 break; 4416 } 4417 if (trunc_len == 0) { 4418 /* we are supposed to have all of it */ 4419 if (at > chlen) { 4420 /* corrupt skip it */ 4421 SCTP_STAT_INCR(sctps_pdrpcrupt); 4422 break; 4423 } 4424 } else { 4425 /* is there enough of it left ? */ 4426 if (desc.chunk_type == SCTP_DATA) { 4427 if (chlen < (sizeof(struct sctp_data_chunk) + 4428 sizeof(desc.data_bytes))) { 4429 break; 4430 } 4431 } else { 4432 if (chlen < sizeof(struct sctp_chunkhdr)) { 4433 break; 4434 } 4435 } 4436 } 4437 if (desc.chunk_type == SCTP_DATA) { 4438 /* can we get out the tsn? */ 4439 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4440 SCTP_STAT_INCR(sctps_pdrpmbda); 4441 4442 if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) { 4443 /* yep */ 4444 struct sctp_data_chunk *dcp; 4445 uint8_t *ddp; 4446 unsigned int iii; 4447 4448 dcp = (struct sctp_data_chunk *)ch; 4449 ddp = (uint8_t *)(dcp + 1); 4450 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) { 4451 desc.data_bytes[iii] = ddp[iii]; 4452 } 4453 desc.tsn_ifany = dcp->dp.tsn; 4454 } else { 4455 /* nope we are done. */ 4456 SCTP_STAT_INCR(sctps_pdrpnedat); 4457 break; 4458 } 4459 } else { 4460 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4461 SCTP_STAT_INCR(sctps_pdrpmbct); 4462 } 4463 4464 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) { 4465 SCTP_STAT_INCR(sctps_pdrppdbrk); 4466 break; 4467 } 4468 if (SCTP_SIZE32(at) > chlen) { 4469 break; 4470 } 4471 chlen -= SCTP_SIZE32(at); 4472 if (chlen < sizeof(struct sctp_chunkhdr)) { 4473 /* done, none left */ 4474 break; 4475 } 4476 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at)); 4477 } 4478 /* Now update any rwnd --- possibly */ 4479 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) { 4480 /* From a peer, we get a rwnd report */ 4481 uint32_t a_rwnd; 4482 4483 SCTP_STAT_INCR(sctps_pdrpfehos); 4484 4485 bottle_bw = ntohl(cp->bottle_bw); 4486 on_queue = ntohl(cp->current_onq); 4487 if (bottle_bw && on_queue) { 4488 /* a rwnd report is in here */ 4489 if (bottle_bw > on_queue) 4490 a_rwnd = bottle_bw - on_queue; 4491 else 4492 a_rwnd = 0; 4493 4494 if (a_rwnd == 0) 4495 stcb->asoc.peers_rwnd = 0; 4496 else { 4497 if (a_rwnd > stcb->asoc.total_flight) { 4498 stcb->asoc.peers_rwnd = 4499 a_rwnd - stcb->asoc.total_flight; 4500 } else { 4501 stcb->asoc.peers_rwnd = 0; 4502 } 4503 if (stcb->asoc.peers_rwnd < 4504 stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 4505 /* SWS sender side engages */ 4506 stcb->asoc.peers_rwnd = 0; 4507 } 4508 } 4509 } 4510 } else { 4511 SCTP_STAT_INCR(sctps_pdrpfmbox); 4512 } 4513 4514 /* now middle boxes in sat networks get a cwnd bump */ 4515 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) && 4516 (stcb->asoc.sat_t3_loss_recovery == 0) && 4517 (stcb->asoc.sat_network)) { 4518 /* 4519 * This is debatable but for sat networks it makes sense 4520 * Note if a T3 timer has went off, we will prohibit any 4521 * changes to cwnd until we exit the t3 loss recovery. 4522 */ 4523 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb, 4524 net, cp, &bottle_bw, &on_queue); 4525 } 4526 } 4527 4528 /* 4529 * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to 4530 * still contain IP/SCTP header - stcb: is the tcb found for this packet - 4531 * offset: offset into the mbuf chain to first chunkhdr - length: is the 4532 * length of the complete packet outputs: - length: modified to remaining 4533 * length after control processing - netp: modified to new sctp_nets after 4534 * cookie-echo processing - return NULL to discard the packet (ie. no asoc, 4535 * bad packet,...) otherwise return the tcb for this packet 4536 */ 4537 #ifdef __GNUC__ 4538 __attribute__((noinline)) 4539 #endif 4540 static struct sctp_tcb * 4541 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length, 4542 struct sockaddr *src, struct sockaddr *dst, 4543 struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp, 4544 struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen, 4545 uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum, 4546 uint32_t vrf_id, uint16_t port) 4547 { 4548 struct sctp_association *asoc; 4549 struct mbuf *op_err; 4550 char msg[SCTP_DIAG_INFO_LEN]; 4551 uint32_t vtag_in; 4552 int num_chunks = 0; /* number of control chunks processed */ 4553 uint32_t chk_length, contiguous; 4554 int ret; 4555 int abort_no_unlock = 0; 4556 int ecne_seen = 0; 4557 4558 /* 4559 * How big should this be, and should it be alloc'd? Lets try the 4560 * d-mtu-ceiling for now (2k) and that should hopefully work ... 4561 * until we get into jumbo grams and such.. 4562 */ 4563 uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE]; 4564 int got_auth = 0; 4565 uint32_t auth_offset = 0, auth_len = 0; 4566 int auth_skipped = 0; 4567 int asconf_cnt = 0; 4568 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4569 struct socket *so; 4570 #endif 4571 4572 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n", 4573 iphlen, *offset, length, (void *)stcb); 4574 4575 if (stcb) { 4576 SCTP_TCB_LOCK_ASSERT(stcb); 4577 } 4578 /* validate chunk header length... */ 4579 if (ntohs(ch->chunk_length) < sizeof(*ch)) { 4580 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n", 4581 ntohs(ch->chunk_length)); 4582 *offset = length; 4583 return (stcb); 4584 } 4585 /* 4586 * validate the verification tag 4587 */ 4588 vtag_in = ntohl(sh->v_tag); 4589 4590 if (ch->chunk_type == SCTP_INITIATION) { 4591 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n", 4592 ntohs(ch->chunk_length), vtag_in); 4593 if (vtag_in != 0) { 4594 /* protocol error- silently discard... */ 4595 SCTP_STAT_INCR(sctps_badvtag); 4596 if (stcb != NULL) { 4597 SCTP_TCB_UNLOCK(stcb); 4598 } 4599 return (NULL); 4600 } 4601 } else if (ch->chunk_type != SCTP_COOKIE_ECHO) { 4602 /* 4603 * If there is no stcb, skip the AUTH chunk and process 4604 * later after a stcb is found (to validate the lookup was 4605 * valid. 4606 */ 4607 if ((ch->chunk_type == SCTP_AUTHENTICATION) && 4608 (stcb == NULL) && 4609 (inp->auth_supported == 1)) { 4610 /* save this chunk for later processing */ 4611 auth_skipped = 1; 4612 auth_offset = *offset; 4613 auth_len = ntohs(ch->chunk_length); 4614 4615 /* (temporarily) move past this chunk */ 4616 *offset += SCTP_SIZE32(auth_len); 4617 if (*offset >= length) { 4618 /* no more data left in the mbuf chain */ 4619 *offset = length; 4620 return (NULL); 4621 } 4622 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4623 sizeof(struct sctp_chunkhdr), chunk_buf); 4624 } 4625 if (ch == NULL) { 4626 /* Help */ 4627 *offset = length; 4628 return (stcb); 4629 } 4630 if (ch->chunk_type == SCTP_COOKIE_ECHO) { 4631 goto process_control_chunks; 4632 } 4633 /* 4634 * first check if it's an ASCONF with an unknown src addr we 4635 * need to look inside to find the association 4636 */ 4637 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) { 4638 struct sctp_chunkhdr *asconf_ch = ch; 4639 uint32_t asconf_offset = 0, asconf_len = 0; 4640 4641 /* inp's refcount may be reduced */ 4642 SCTP_INP_INCR_REF(inp); 4643 4644 asconf_offset = *offset; 4645 do { 4646 asconf_len = ntohs(asconf_ch->chunk_length); 4647 if (asconf_len < sizeof(struct sctp_asconf_paramhdr)) 4648 break; 4649 stcb = sctp_findassociation_ep_asconf(m, 4650 *offset, 4651 dst, 4652 sh, &inp, netp, vrf_id); 4653 if (stcb != NULL) 4654 break; 4655 asconf_offset += SCTP_SIZE32(asconf_len); 4656 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset, 4657 sizeof(struct sctp_chunkhdr), chunk_buf); 4658 } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF); 4659 if (stcb == NULL) { 4660 /* 4661 * reduce inp's refcount if not reduced in 4662 * sctp_findassociation_ep_asconf(). 4663 */ 4664 SCTP_INP_DECR_REF(inp); 4665 } 4666 4667 /* now go back and verify any auth chunk to be sure */ 4668 if (auth_skipped && (stcb != NULL)) { 4669 struct sctp_auth_chunk *auth; 4670 4671 auth = (struct sctp_auth_chunk *) 4672 sctp_m_getptr(m, auth_offset, 4673 auth_len, chunk_buf); 4674 got_auth = 1; 4675 auth_skipped = 0; 4676 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, 4677 auth_offset)) { 4678 /* auth HMAC failed so dump it */ 4679 *offset = length; 4680 return (stcb); 4681 } else { 4682 /* remaining chunks are HMAC checked */ 4683 stcb->asoc.authenticated = 1; 4684 } 4685 } 4686 } 4687 if (stcb == NULL) { 4688 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 4689 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4690 msg); 4691 /* no association, so it's out of the blue... */ 4692 sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, op_err, 4693 mflowtype, mflowid, inp->fibnum, 4694 vrf_id, port); 4695 *offset = length; 4696 return (NULL); 4697 } 4698 asoc = &stcb->asoc; 4699 /* ABORT and SHUTDOWN can use either v_tag... */ 4700 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) || 4701 (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) || 4702 (ch->chunk_type == SCTP_PACKET_DROPPED)) { 4703 /* Take the T-bit always into account. */ 4704 if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) && 4705 (vtag_in == asoc->my_vtag)) || 4706 (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) && 4707 (asoc->peer_vtag != htonl(0)) && 4708 (vtag_in == asoc->peer_vtag))) { 4709 /* this is valid */ 4710 } else { 4711 /* drop this packet... */ 4712 SCTP_STAT_INCR(sctps_badvtag); 4713 if (stcb != NULL) { 4714 SCTP_TCB_UNLOCK(stcb); 4715 } 4716 return (NULL); 4717 } 4718 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 4719 if (vtag_in != asoc->my_vtag) { 4720 /* 4721 * this could be a stale SHUTDOWN-ACK or the 4722 * peer never got the SHUTDOWN-COMPLETE and 4723 * is still hung; we have started a new asoc 4724 * but it won't complete until the shutdown 4725 * is completed 4726 */ 4727 if (stcb != NULL) { 4728 SCTP_TCB_UNLOCK(stcb); 4729 } 4730 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 4731 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4732 msg); 4733 sctp_handle_ootb(m, iphlen, *offset, src, dst, 4734 sh, inp, op_err, 4735 mflowtype, mflowid, fibnum, 4736 vrf_id, port); 4737 return (NULL); 4738 } 4739 } else { 4740 /* for all other chunks, vtag must match */ 4741 if (vtag_in != asoc->my_vtag) { 4742 /* invalid vtag... */ 4743 SCTPDBG(SCTP_DEBUG_INPUT3, 4744 "invalid vtag: %xh, expect %xh\n", 4745 vtag_in, asoc->my_vtag); 4746 SCTP_STAT_INCR(sctps_badvtag); 4747 if (stcb != NULL) { 4748 SCTP_TCB_UNLOCK(stcb); 4749 } 4750 *offset = length; 4751 return (NULL); 4752 } 4753 } 4754 } /* end if !SCTP_COOKIE_ECHO */ 4755 /* 4756 * process all control chunks... 4757 */ 4758 if (((ch->chunk_type == SCTP_SELECTIVE_ACK) || 4759 (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) || 4760 (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) && 4761 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 4762 /* implied cookie-ack.. we must have lost the ack */ 4763 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, 4764 *netp); 4765 } 4766 4767 process_control_chunks: 4768 while (IS_SCTP_CONTROL(ch)) { 4769 /* validate chunk length */ 4770 chk_length = ntohs(ch->chunk_length); 4771 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n", 4772 ch->chunk_type, chk_length); 4773 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length); 4774 if (chk_length < sizeof(*ch) || 4775 (*offset + (int)chk_length) > length) { 4776 *offset = length; 4777 return (stcb); 4778 } 4779 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks); 4780 /* 4781 * INIT and INIT-ACK only gets the init ack "header" portion 4782 * only because we don't have to process the peer's COOKIE. 4783 * All others get a complete chunk. 4784 */ 4785 switch (ch->chunk_type) { 4786 case SCTP_INITIATION: 4787 contiguous = sizeof(struct sctp_init_chunk); 4788 break; 4789 case SCTP_INITIATION_ACK: 4790 contiguous = sizeof(struct sctp_init_ack_chunk); 4791 break; 4792 default: 4793 contiguous = min(chk_length, sizeof(chunk_buf)); 4794 break; 4795 } 4796 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4797 contiguous, 4798 chunk_buf); 4799 if (ch == NULL) { 4800 *offset = length; 4801 if (stcb != NULL) { 4802 SCTP_TCB_UNLOCK(stcb); 4803 } 4804 return (NULL); 4805 } 4806 4807 num_chunks++; 4808 /* Save off the last place we got a control from */ 4809 if (stcb != NULL) { 4810 if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) { 4811 /* 4812 * allow last_control to be NULL if 4813 * ASCONF... ASCONF processing will find the 4814 * right net later 4815 */ 4816 if ((netp != NULL) && (*netp != NULL)) 4817 stcb->asoc.last_control_chunk_from = *netp; 4818 } 4819 } 4820 #ifdef SCTP_AUDITING_ENABLED 4821 sctp_audit_log(0xB0, ch->chunk_type); 4822 #endif 4823 4824 /* check to see if this chunk required auth, but isn't */ 4825 if ((stcb != NULL) && 4826 sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) && 4827 !stcb->asoc.authenticated) { 4828 /* "silently" ignore */ 4829 SCTP_STAT_INCR(sctps_recvauthmissing); 4830 goto next_chunk; 4831 } 4832 switch (ch->chunk_type) { 4833 case SCTP_INITIATION: 4834 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n"); 4835 /* The INIT chunk must be the only chunk. */ 4836 if ((num_chunks > 1) || 4837 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4838 /* RFC 4960 requires that no ABORT is sent */ 4839 *offset = length; 4840 if (stcb != NULL) { 4841 SCTP_TCB_UNLOCK(stcb); 4842 } 4843 return (NULL); 4844 } 4845 /* Honor our resource limit. */ 4846 if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) { 4847 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 4848 sctp_abort_association(inp, stcb, m, iphlen, 4849 src, dst, sh, op_err, 4850 mflowtype, mflowid, 4851 vrf_id, port); 4852 *offset = length; 4853 return (NULL); 4854 } 4855 sctp_handle_init(m, iphlen, *offset, src, dst, sh, 4856 (struct sctp_init_chunk *)ch, inp, 4857 stcb, *netp, &abort_no_unlock, 4858 mflowtype, mflowid, 4859 vrf_id, port); 4860 *offset = length; 4861 if ((!abort_no_unlock) && (stcb != NULL)) { 4862 SCTP_TCB_UNLOCK(stcb); 4863 } 4864 return (NULL); 4865 break; 4866 case SCTP_PAD_CHUNK: 4867 break; 4868 case SCTP_INITIATION_ACK: 4869 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT_ACK\n"); 4870 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4871 /* We are not interested anymore */ 4872 if ((stcb != NULL) && (stcb->asoc.total_output_queue_size)) { 4873 ; 4874 } else { 4875 *offset = length; 4876 if (stcb != NULL) { 4877 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4878 so = SCTP_INP_SO(inp); 4879 atomic_add_int(&stcb->asoc.refcnt, 1); 4880 SCTP_TCB_UNLOCK(stcb); 4881 SCTP_SOCKET_LOCK(so, 1); 4882 SCTP_TCB_LOCK(stcb); 4883 atomic_subtract_int(&stcb->asoc.refcnt, 1); 4884 #endif 4885 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 4886 SCTP_FROM_SCTP_INPUT + SCTP_LOC_29); 4887 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4888 SCTP_SOCKET_UNLOCK(so, 1); 4889 #endif 4890 } 4891 return (NULL); 4892 } 4893 } 4894 /* The INIT-ACK chunk must be the only chunk. */ 4895 if ((num_chunks > 1) || 4896 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4897 *offset = length; 4898 return (stcb); 4899 } 4900 if ((netp != NULL) && (*netp != NULL)) { 4901 ret = sctp_handle_init_ack(m, iphlen, *offset, 4902 src, dst, sh, 4903 (struct sctp_init_ack_chunk *)ch, 4904 stcb, *netp, 4905 &abort_no_unlock, 4906 mflowtype, mflowid, 4907 vrf_id); 4908 } else { 4909 ret = -1; 4910 } 4911 *offset = length; 4912 if (abort_no_unlock) { 4913 return (NULL); 4914 } 4915 /* 4916 * Special case, I must call the output routine to 4917 * get the cookie echoed 4918 */ 4919 if ((stcb != NULL) && (ret == 0)) { 4920 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 4921 } 4922 return (stcb); 4923 break; 4924 case SCTP_SELECTIVE_ACK: 4925 case SCTP_NR_SELECTIVE_ACK: 4926 { 4927 int abort_now = 0; 4928 uint32_t a_rwnd, cum_ack; 4929 uint16_t num_seg, num_nr_seg, num_dup; 4930 uint8_t flags; 4931 int offset_seg, offset_dup; 4932 4933 SCTPDBG(SCTP_DEBUG_INPUT3, "%s\n", 4934 ch->chunk_type == SCTP_SELECTIVE_ACK ? "SCTP_SACK" : "SCTP_NR_SACK"); 4935 SCTP_STAT_INCR(sctps_recvsacks); 4936 if (stcb == NULL) { 4937 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing %s chunk\n", 4938 (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK"); 4939 break; 4940 } 4941 if (ch->chunk_type == SCTP_SELECTIVE_ACK) { 4942 if (chk_length < sizeof(struct sctp_sack_chunk)) { 4943 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n"); 4944 break; 4945 } 4946 } else { 4947 if (stcb->asoc.nrsack_supported == 0) { 4948 goto unknown_chunk; 4949 } 4950 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) { 4951 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR_SACK chunk, too small\n"); 4952 break; 4953 } 4954 } 4955 if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4956 /*- 4957 * If we have sent a shutdown-ack, we will pay no 4958 * attention to a sack sent in to us since 4959 * we don't care anymore. 4960 */ 4961 break; 4962 } 4963 flags = ch->chunk_flags; 4964 if (ch->chunk_type == SCTP_SELECTIVE_ACK) { 4965 struct sctp_sack_chunk *sack; 4966 4967 sack = (struct sctp_sack_chunk *)ch; 4968 cum_ack = ntohl(sack->sack.cum_tsn_ack); 4969 num_seg = ntohs(sack->sack.num_gap_ack_blks); 4970 num_nr_seg = 0; 4971 num_dup = ntohs(sack->sack.num_dup_tsns); 4972 a_rwnd = ntohl(sack->sack.a_rwnd); 4973 if (sizeof(struct sctp_sack_chunk) + 4974 num_seg * sizeof(struct sctp_gap_ack_block) + 4975 num_dup * sizeof(uint32_t) != chk_length) { 4976 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n"); 4977 break; 4978 } 4979 offset_seg = *offset + sizeof(struct sctp_sack_chunk); 4980 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 4981 } else { 4982 struct sctp_nr_sack_chunk *nr_sack; 4983 4984 nr_sack = (struct sctp_nr_sack_chunk *)ch; 4985 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack); 4986 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks); 4987 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks); 4988 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns); 4989 a_rwnd = ntohl(nr_sack->nr_sack.a_rwnd); 4990 if (sizeof(struct sctp_nr_sack_chunk) + 4991 (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) + 4992 num_dup * sizeof(uint32_t) != chk_length) { 4993 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n"); 4994 break; 4995 } 4996 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk); 4997 offset_dup = offset_seg + (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block); 4998 } 4999 SCTPDBG(SCTP_DEBUG_INPUT3, "%s process cum_ack:%x num_seg:%d a_rwnd:%d\n", 5000 (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK", 5001 cum_ack, num_seg, a_rwnd); 5002 stcb->asoc.seen_a_sack_this_pkt = 1; 5003 if ((stcb->asoc.pr_sctp_cnt == 0) && 5004 (num_seg == 0) && (num_nr_seg == 0) && 5005 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 5006 (stcb->asoc.saw_sack_with_frags == 0) && 5007 (stcb->asoc.saw_sack_with_nr_frags == 0) && 5008 (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) { 5009 /* 5010 * We have a SIMPLE sack having no 5011 * prior segments and data on sent 5012 * queue to be acked. Use the faster 5013 * path sack processing. We also 5014 * allow window update sacks with no 5015 * missing segments to go this way 5016 * too. 5017 */ 5018 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, 5019 &abort_now, ecne_seen); 5020 } else { 5021 if ((netp != NULL) && (*netp != NULL)) { 5022 sctp_handle_sack(m, offset_seg, offset_dup, stcb, 5023 num_seg, num_nr_seg, num_dup, &abort_now, flags, 5024 cum_ack, a_rwnd, ecne_seen); 5025 } 5026 } 5027 if (abort_now) { 5028 /* ABORT signal from sack processing */ 5029 *offset = length; 5030 return (NULL); 5031 } 5032 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 5033 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 5034 (stcb->asoc.stream_queue_cnt == 0)) { 5035 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 5036 } 5037 break; 5038 } 5039 case SCTP_HEARTBEAT_REQUEST: 5040 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n"); 5041 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 5042 SCTP_STAT_INCR(sctps_recvheartbeat); 5043 sctp_send_heartbeat_ack(stcb, m, *offset, 5044 chk_length, *netp); 5045 } 5046 break; 5047 case SCTP_HEARTBEAT_ACK: 5048 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT_ACK\n"); 5049 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) { 5050 /* Its not ours */ 5051 *offset = length; 5052 return (stcb); 5053 } 5054 SCTP_STAT_INCR(sctps_recvheartbeatack); 5055 if ((netp != NULL) && (*netp != NULL)) { 5056 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch, 5057 stcb, *netp); 5058 } 5059 break; 5060 case SCTP_ABORT_ASSOCIATION: 5061 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n", 5062 (void *)stcb); 5063 *offset = length; 5064 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 5065 if (sctp_handle_abort((struct sctp_abort_chunk *)ch, stcb, *netp)) { 5066 return (NULL); 5067 } else { 5068 return (stcb); 5069 } 5070 } else { 5071 return (NULL); 5072 } 5073 break; 5074 case SCTP_SHUTDOWN: 5075 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n", 5076 (void *)stcb); 5077 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) { 5078 *offset = length; 5079 return (stcb); 5080 } 5081 if ((netp != NULL) && (*netp != NULL)) { 5082 int abort_flag = 0; 5083 5084 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch, 5085 stcb, *netp, &abort_flag); 5086 if (abort_flag) { 5087 *offset = length; 5088 return (NULL); 5089 } 5090 } 5091 break; 5092 case SCTP_SHUTDOWN_ACK: 5093 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_ACK, stcb %p\n", (void *)stcb); 5094 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 5095 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp); 5096 } 5097 *offset = length; 5098 return (NULL); 5099 break; 5100 case SCTP_OPERATION_ERROR: 5101 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP_ERR\n"); 5102 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL) && 5103 sctp_handle_error(ch, stcb, *netp, contiguous) < 0) { 5104 *offset = length; 5105 return (NULL); 5106 } 5107 break; 5108 case SCTP_COOKIE_ECHO: 5109 SCTPDBG(SCTP_DEBUG_INPUT3, 5110 "SCTP_COOKIE_ECHO, stcb %p\n", (void *)stcb); 5111 if ((stcb != NULL) && (stcb->asoc.total_output_queue_size > 0)) { 5112 ; 5113 } else { 5114 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5115 /* We are not interested anymore */ 5116 abend: 5117 if (stcb != NULL) { 5118 SCTP_TCB_UNLOCK(stcb); 5119 } 5120 *offset = length; 5121 return (NULL); 5122 } 5123 } 5124 /*- 5125 * First are we accepting? We do this again here 5126 * since it is possible that a previous endpoint WAS 5127 * listening responded to a INIT-ACK and then 5128 * closed. We opened and bound.. and are now no 5129 * longer listening. 5130 * 5131 * XXXGL: notes on checking listen queue length. 5132 * 1) SCTP_IS_LISTENING() doesn't necessarily mean 5133 * SOLISTENING(), because a listening "UDP type" 5134 * socket isn't listening in terms of the socket 5135 * layer. It is a normal data flow socket, that 5136 * can fork off new connections. Thus, we should 5137 * look into sol_qlen only in case we are !UDP. 5138 * 2) Checking sol_qlen in general requires locking 5139 * the socket, and this code lacks that. 5140 */ 5141 if ((stcb == NULL) && 5142 (!SCTP_IS_LISTENING(inp) || 5143 (!(inp->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE) && 5144 inp->sctp_socket->sol_qlen >= inp->sctp_socket->sol_qlimit))) { 5145 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 5146 (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) { 5147 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 5148 sctp_abort_association(inp, stcb, m, iphlen, 5149 src, dst, sh, op_err, 5150 mflowtype, mflowid, 5151 vrf_id, port); 5152 } 5153 *offset = length; 5154 return (NULL); 5155 } else { 5156 struct mbuf *ret_buf; 5157 struct sctp_inpcb *linp; 5158 5159 if (stcb) { 5160 linp = NULL; 5161 } else { 5162 linp = inp; 5163 } 5164 5165 if (linp != NULL) { 5166 SCTP_ASOC_CREATE_LOCK(linp); 5167 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 5168 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) { 5169 SCTP_ASOC_CREATE_UNLOCK(linp); 5170 goto abend; 5171 } 5172 } 5173 5174 if (netp != NULL) { 5175 struct sctp_tcb *locked_stcb; 5176 5177 locked_stcb = stcb; 5178 ret_buf = 5179 sctp_handle_cookie_echo(m, iphlen, 5180 *offset, 5181 src, dst, 5182 sh, 5183 (struct sctp_cookie_echo_chunk *)ch, 5184 &inp, &stcb, netp, 5185 auth_skipped, 5186 auth_offset, 5187 auth_len, 5188 &locked_stcb, 5189 mflowtype, 5190 mflowid, 5191 vrf_id, 5192 port); 5193 if ((locked_stcb != NULL) && (locked_stcb != stcb)) { 5194 SCTP_TCB_UNLOCK(locked_stcb); 5195 } 5196 if (stcb != NULL) { 5197 SCTP_TCB_LOCK_ASSERT(stcb); 5198 } 5199 } else { 5200 ret_buf = NULL; 5201 } 5202 if (linp != NULL) { 5203 SCTP_ASOC_CREATE_UNLOCK(linp); 5204 } 5205 if (ret_buf == NULL) { 5206 if (stcb != NULL) { 5207 SCTP_TCB_UNLOCK(stcb); 5208 } 5209 SCTPDBG(SCTP_DEBUG_INPUT3, 5210 "GAK, null buffer\n"); 5211 *offset = length; 5212 return (NULL); 5213 } 5214 /* if AUTH skipped, see if it verified... */ 5215 if (auth_skipped) { 5216 got_auth = 1; 5217 auth_skipped = 0; 5218 } 5219 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) { 5220 /* 5221 * Restart the timer if we have 5222 * pending data 5223 */ 5224 struct sctp_tmit_chunk *chk; 5225 5226 chk = TAILQ_FIRST(&stcb->asoc.sent_queue); 5227 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 5228 } 5229 } 5230 break; 5231 case SCTP_COOKIE_ACK: 5232 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE_ACK, stcb %p\n", (void *)stcb); 5233 if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) { 5234 return (stcb); 5235 } 5236 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5237 /* We are not interested anymore */ 5238 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 5239 ; 5240 } else if (stcb) { 5241 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5242 so = SCTP_INP_SO(inp); 5243 atomic_add_int(&stcb->asoc.refcnt, 1); 5244 SCTP_TCB_UNLOCK(stcb); 5245 SCTP_SOCKET_LOCK(so, 1); 5246 SCTP_TCB_LOCK(stcb); 5247 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5248 #endif 5249 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 5250 SCTP_FROM_SCTP_INPUT + SCTP_LOC_30); 5251 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5252 SCTP_SOCKET_UNLOCK(so, 1); 5253 #endif 5254 *offset = length; 5255 return (NULL); 5256 } 5257 } 5258 if ((netp != NULL) && (*netp != NULL)) { 5259 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp); 5260 } 5261 break; 5262 case SCTP_ECN_ECHO: 5263 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_ECHO\n"); 5264 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) { 5265 /* Its not ours */ 5266 *offset = length; 5267 return (stcb); 5268 } 5269 if (stcb->asoc.ecn_supported == 0) { 5270 goto unknown_chunk; 5271 } 5272 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, stcb); 5273 ecne_seen = 1; 5274 break; 5275 case SCTP_ECN_CWR: 5276 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_CWR\n"); 5277 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) { 5278 *offset = length; 5279 return (stcb); 5280 } 5281 if (stcb->asoc.ecn_supported == 0) { 5282 goto unknown_chunk; 5283 } 5284 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp); 5285 break; 5286 case SCTP_SHUTDOWN_COMPLETE: 5287 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_COMPLETE, stcb %p\n", (void *)stcb); 5288 /* must be first and only chunk */ 5289 if ((num_chunks > 1) || 5290 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 5291 *offset = length; 5292 return (stcb); 5293 } 5294 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 5295 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch, 5296 stcb, *netp); 5297 } 5298 *offset = length; 5299 return (NULL); 5300 break; 5301 case SCTP_ASCONF: 5302 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n"); 5303 if (stcb != NULL) { 5304 if (stcb->asoc.asconf_supported == 0) { 5305 goto unknown_chunk; 5306 } 5307 sctp_handle_asconf(m, *offset, src, 5308 (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0); 5309 asconf_cnt++; 5310 } 5311 break; 5312 case SCTP_ASCONF_ACK: 5313 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF_ACK\n"); 5314 if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) { 5315 /* Its not ours */ 5316 *offset = length; 5317 return (stcb); 5318 } 5319 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 5320 if (stcb->asoc.asconf_supported == 0) { 5321 goto unknown_chunk; 5322 } 5323 /* He's alive so give him credit */ 5324 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5325 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5326 stcb->asoc.overall_error_count, 5327 0, 5328 SCTP_FROM_SCTP_INPUT, 5329 __LINE__); 5330 } 5331 stcb->asoc.overall_error_count = 0; 5332 sctp_handle_asconf_ack(m, *offset, 5333 (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock); 5334 if (abort_no_unlock) 5335 return (NULL); 5336 } 5337 break; 5338 case SCTP_FORWARD_CUM_TSN: 5339 case SCTP_IFORWARD_CUM_TSN: 5340 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD_TSN\n"); 5341 if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) { 5342 /* Its not ours */ 5343 *offset = length; 5344 return (stcb); 5345 } 5346 5347 if (stcb != NULL) { 5348 int abort_flag = 0; 5349 5350 if (stcb->asoc.prsctp_supported == 0) { 5351 goto unknown_chunk; 5352 } 5353 *fwd_tsn_seen = 1; 5354 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5355 /* We are not interested anymore */ 5356 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5357 so = SCTP_INP_SO(inp); 5358 atomic_add_int(&stcb->asoc.refcnt, 1); 5359 SCTP_TCB_UNLOCK(stcb); 5360 SCTP_SOCKET_LOCK(so, 1); 5361 SCTP_TCB_LOCK(stcb); 5362 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5363 #endif 5364 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 5365 SCTP_FROM_SCTP_INPUT + SCTP_LOC_31); 5366 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5367 SCTP_SOCKET_UNLOCK(so, 1); 5368 #endif 5369 *offset = length; 5370 return (NULL); 5371 } 5372 /* 5373 * For sending a SACK this looks like DATA 5374 * chunks. 5375 */ 5376 stcb->asoc.last_data_chunk_from = stcb->asoc.last_control_chunk_from; 5377 sctp_handle_forward_tsn(stcb, 5378 (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset); 5379 if (abort_flag) { 5380 *offset = length; 5381 return (NULL); 5382 } 5383 } 5384 break; 5385 case SCTP_STREAM_RESET: 5386 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n"); 5387 if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) { 5388 /* Its not ours */ 5389 *offset = length; 5390 return (stcb); 5391 } 5392 if (stcb->asoc.reconfig_supported == 0) { 5393 goto unknown_chunk; 5394 } 5395 if (sctp_handle_stream_reset(stcb, m, *offset, ch)) { 5396 /* stop processing */ 5397 *offset = length; 5398 return (NULL); 5399 } 5400 break; 5401 case SCTP_PACKET_DROPPED: 5402 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n"); 5403 /* re-get it all please */ 5404 if (chk_length < sizeof(struct sctp_pktdrop_chunk)) { 5405 /* Its not ours */ 5406 *offset = length; 5407 return (stcb); 5408 } 5409 5410 if ((ch != NULL) && (stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 5411 if (stcb->asoc.pktdrop_supported == 0) { 5412 goto unknown_chunk; 5413 } 5414 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch, 5415 stcb, *netp, 5416 min(chk_length, contiguous)); 5417 } 5418 break; 5419 case SCTP_AUTHENTICATION: 5420 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n"); 5421 if (stcb == NULL) { 5422 /* save the first AUTH for later processing */ 5423 if (auth_skipped == 0) { 5424 auth_offset = *offset; 5425 auth_len = chk_length; 5426 auth_skipped = 1; 5427 } 5428 /* skip this chunk (temporarily) */ 5429 goto next_chunk; 5430 } 5431 if (stcb->asoc.auth_supported == 0) { 5432 goto unknown_chunk; 5433 } 5434 if ((chk_length < (sizeof(struct sctp_auth_chunk))) || 5435 (chk_length > (sizeof(struct sctp_auth_chunk) + 5436 SCTP_AUTH_DIGEST_LEN_MAX))) { 5437 /* Its not ours */ 5438 *offset = length; 5439 return (stcb); 5440 } 5441 if (got_auth == 1) { 5442 /* skip this chunk... it's already auth'd */ 5443 goto next_chunk; 5444 } 5445 got_auth = 1; 5446 if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch, 5447 m, *offset)) { 5448 /* auth HMAC failed so dump the packet */ 5449 *offset = length; 5450 return (stcb); 5451 } else { 5452 /* remaining chunks are HMAC checked */ 5453 stcb->asoc.authenticated = 1; 5454 } 5455 break; 5456 5457 default: 5458 unknown_chunk: 5459 /* it's an unknown chunk! */ 5460 if ((ch->chunk_type & 0x40) && (stcb != NULL)) { 5461 struct sctp_gen_error_cause *cause; 5462 int len; 5463 5464 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_gen_error_cause), 5465 0, M_NOWAIT, 1, MT_DATA); 5466 if (op_err != NULL) { 5467 len = min(SCTP_SIZE32(chk_length), (uint32_t)(length - *offset)); 5468 cause = mtod(op_err, struct sctp_gen_error_cause *); 5469 cause->code = htons(SCTP_CAUSE_UNRECOG_CHUNK); 5470 cause->length = htons((uint16_t)(len + sizeof(struct sctp_gen_error_cause))); 5471 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_gen_error_cause); 5472 SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(m, *offset, len, M_NOWAIT); 5473 if (SCTP_BUF_NEXT(op_err) != NULL) { 5474 #ifdef SCTP_MBUF_LOGGING 5475 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5476 sctp_log_mbc(SCTP_BUF_NEXT(op_err), SCTP_MBUF_ICOPY); 5477 } 5478 #endif 5479 sctp_queue_op_err(stcb, op_err); 5480 } else { 5481 sctp_m_freem(op_err); 5482 } 5483 } 5484 } 5485 if ((ch->chunk_type & 0x80) == 0) { 5486 /* discard this packet */ 5487 *offset = length; 5488 return (stcb); 5489 } /* else skip this bad chunk and continue... */ 5490 break; 5491 } /* switch (ch->chunk_type) */ 5492 5493 5494 next_chunk: 5495 /* get the next chunk */ 5496 *offset += SCTP_SIZE32(chk_length); 5497 if (*offset >= length) { 5498 /* no more data left in the mbuf chain */ 5499 break; 5500 } 5501 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 5502 sizeof(struct sctp_chunkhdr), chunk_buf); 5503 if (ch == NULL) { 5504 *offset = length; 5505 return (stcb); 5506 } 5507 } /* while */ 5508 5509 if ((asconf_cnt > 0) && (stcb != NULL)) { 5510 sctp_send_asconf_ack(stcb); 5511 } 5512 return (stcb); 5513 } 5514 5515 5516 /* 5517 * common input chunk processing (v4 and v6) 5518 */ 5519 void 5520 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length, 5521 struct sockaddr *src, struct sockaddr *dst, 5522 struct sctphdr *sh, struct sctp_chunkhdr *ch, 5523 uint8_t compute_crc, 5524 uint8_t ecn_bits, 5525 uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum, 5526 uint32_t vrf_id, uint16_t port) 5527 { 5528 uint32_t high_tsn; 5529 int fwd_tsn_seen = 0, data_processed = 0; 5530 struct mbuf *m = *mm, *op_err; 5531 char msg[SCTP_DIAG_INFO_LEN]; 5532 int un_sent; 5533 int cnt_ctrl_ready = 0; 5534 struct sctp_inpcb *inp = NULL, *inp_decr = NULL; 5535 struct sctp_tcb *stcb = NULL; 5536 struct sctp_nets *net = NULL; 5537 5538 SCTP_STAT_INCR(sctps_recvdatagrams); 5539 #ifdef SCTP_AUDITING_ENABLED 5540 sctp_audit_log(0xE0, 1); 5541 sctp_auditing(0, inp, stcb, net); 5542 #endif 5543 if (compute_crc != 0) { 5544 uint32_t check, calc_check; 5545 5546 check = sh->checksum; 5547 sh->checksum = 0; 5548 calc_check = sctp_calculate_cksum(m, iphlen); 5549 sh->checksum = check; 5550 if (calc_check != check) { 5551 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x m:%p mlen:%d iphlen:%d\n", 5552 calc_check, check, (void *)m, length, iphlen); 5553 stcb = sctp_findassociation_addr(m, offset, src, dst, 5554 sh, ch, &inp, &net, vrf_id); 5555 #if defined(INET) || defined(INET6) 5556 if ((ch->chunk_type != SCTP_INITIATION) && 5557 (net != NULL) && (net->port != port)) { 5558 if (net->port == 0) { 5559 /* UDP encapsulation turned on. */ 5560 net->mtu -= sizeof(struct udphdr); 5561 if (stcb->asoc.smallest_mtu > net->mtu) { 5562 sctp_pathmtu_adjustment(stcb, net->mtu); 5563 } 5564 } else if (port == 0) { 5565 /* UDP encapsulation turned off. */ 5566 net->mtu += sizeof(struct udphdr); 5567 /* XXX Update smallest_mtu */ 5568 } 5569 net->port = port; 5570 } 5571 #endif 5572 if (net != NULL) { 5573 net->flowtype = mflowtype; 5574 net->flowid = mflowid; 5575 } 5576 if ((inp != NULL) && (stcb != NULL)) { 5577 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1); 5578 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED); 5579 } else if ((inp != NULL) && (stcb == NULL)) { 5580 inp_decr = inp; 5581 } 5582 SCTP_STAT_INCR(sctps_badsum); 5583 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors); 5584 goto out; 5585 } 5586 } 5587 /* Destination port of 0 is illegal, based on RFC4960. */ 5588 if (sh->dest_port == 0) { 5589 SCTP_STAT_INCR(sctps_hdrops); 5590 goto out; 5591 } 5592 stcb = sctp_findassociation_addr(m, offset, src, dst, 5593 sh, ch, &inp, &net, vrf_id); 5594 #if defined(INET) || defined(INET6) 5595 if ((ch->chunk_type != SCTP_INITIATION) && 5596 (net != NULL) && (net->port != port)) { 5597 if (net->port == 0) { 5598 /* UDP encapsulation turned on. */ 5599 net->mtu -= sizeof(struct udphdr); 5600 if (stcb->asoc.smallest_mtu > net->mtu) { 5601 sctp_pathmtu_adjustment(stcb, net->mtu); 5602 } 5603 } else if (port == 0) { 5604 /* UDP encapsulation turned off. */ 5605 net->mtu += sizeof(struct udphdr); 5606 /* XXX Update smallest_mtu */ 5607 } 5608 net->port = port; 5609 } 5610 #endif 5611 if (net != NULL) { 5612 net->flowtype = mflowtype; 5613 net->flowid = mflowid; 5614 } 5615 if (inp == NULL) { 5616 SCTP_STAT_INCR(sctps_noport); 5617 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) { 5618 goto out; 5619 } 5620 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 5621 sctp_send_shutdown_complete2(src, dst, sh, 5622 mflowtype, mflowid, fibnum, 5623 vrf_id, port); 5624 goto out; 5625 } 5626 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) { 5627 goto out; 5628 } 5629 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) { 5630 if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) || 5631 ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) && 5632 (ch->chunk_type != SCTP_INIT))) { 5633 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5634 "Out of the blue"); 5635 sctp_send_abort(m, iphlen, src, dst, 5636 sh, 0, op_err, 5637 mflowtype, mflowid, fibnum, 5638 vrf_id, port); 5639 } 5640 } 5641 goto out; 5642 } else if (stcb == NULL) { 5643 inp_decr = inp; 5644 } 5645 SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n", 5646 (void *)m, iphlen, offset, length, (void *)stcb); 5647 if (stcb) { 5648 /* always clear this before beginning a packet */ 5649 stcb->asoc.authenticated = 0; 5650 stcb->asoc.seen_a_sack_this_pkt = 0; 5651 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n", 5652 (void *)stcb, stcb->asoc.state); 5653 5654 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) || 5655 (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) { 5656 /*- 5657 * If we hit here, we had a ref count 5658 * up when the assoc was aborted and the 5659 * timer is clearing out the assoc, we should 5660 * NOT respond to any packet.. its OOTB. 5661 */ 5662 SCTP_TCB_UNLOCK(stcb); 5663 stcb = NULL; 5664 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5665 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5666 msg); 5667 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5668 mflowtype, mflowid, inp->fibnum, 5669 vrf_id, port); 5670 goto out; 5671 } 5672 5673 } 5674 if (IS_SCTP_CONTROL(ch)) { 5675 /* process the control portion of the SCTP packet */ 5676 /* sa_ignore NO_NULL_CHK */ 5677 stcb = sctp_process_control(m, iphlen, &offset, length, 5678 src, dst, sh, ch, 5679 inp, stcb, &net, &fwd_tsn_seen, 5680 mflowtype, mflowid, fibnum, 5681 vrf_id, port); 5682 if (stcb) { 5683 /* 5684 * This covers us if the cookie-echo was there and 5685 * it changes our INP. 5686 */ 5687 inp = stcb->sctp_ep; 5688 #if defined(INET) || defined(INET6) 5689 if ((ch->chunk_type != SCTP_INITIATION) && 5690 (net != NULL) && (net->port != port)) { 5691 if (net->port == 0) { 5692 /* UDP encapsulation turned on. */ 5693 net->mtu -= sizeof(struct udphdr); 5694 if (stcb->asoc.smallest_mtu > net->mtu) { 5695 sctp_pathmtu_adjustment(stcb, net->mtu); 5696 } 5697 } else if (port == 0) { 5698 /* UDP encapsulation turned off. */ 5699 net->mtu += sizeof(struct udphdr); 5700 /* XXX Update smallest_mtu */ 5701 } 5702 net->port = port; 5703 } 5704 #endif 5705 } 5706 } else { 5707 /* 5708 * no control chunks, so pre-process DATA chunks (these 5709 * checks are taken care of by control processing) 5710 */ 5711 5712 /* 5713 * if DATA only packet, and auth is required, then punt... 5714 * can't have authenticated without any AUTH (control) 5715 * chunks 5716 */ 5717 if ((stcb != NULL) && 5718 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) { 5719 /* "silently" ignore */ 5720 SCTP_STAT_INCR(sctps_recvauthmissing); 5721 goto out; 5722 } 5723 if (stcb == NULL) { 5724 /* out of the blue DATA chunk */ 5725 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5726 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5727 msg); 5728 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5729 mflowtype, mflowid, fibnum, 5730 vrf_id, port); 5731 goto out; 5732 } 5733 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) { 5734 /* v_tag mismatch! */ 5735 SCTP_STAT_INCR(sctps_badvtag); 5736 goto out; 5737 } 5738 } 5739 5740 if (stcb == NULL) { 5741 /* 5742 * no valid TCB for this packet, or we found it's a bad 5743 * packet while processing control, or we're done with this 5744 * packet (done or skip rest of data), so we drop it... 5745 */ 5746 goto out; 5747 } 5748 5749 /* 5750 * DATA chunk processing 5751 */ 5752 /* plow through the data chunks while length > offset */ 5753 5754 /* 5755 * Rest should be DATA only. Check authentication state if AUTH for 5756 * DATA is required. 5757 */ 5758 if ((length > offset) && 5759 (stcb != NULL) && 5760 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) && 5761 !stcb->asoc.authenticated) { 5762 /* "silently" ignore */ 5763 SCTP_STAT_INCR(sctps_recvauthmissing); 5764 SCTPDBG(SCTP_DEBUG_AUTH1, 5765 "Data chunk requires AUTH, skipped\n"); 5766 goto trigger_send; 5767 } 5768 if (length > offset) { 5769 int retval; 5770 5771 /* 5772 * First check to make sure our state is correct. We would 5773 * not get here unless we really did have a tag, so we don't 5774 * abort if this happens, just dump the chunk silently. 5775 */ 5776 switch (SCTP_GET_STATE(stcb)) { 5777 case SCTP_STATE_COOKIE_ECHOED: 5778 /* 5779 * we consider data with valid tags in this state 5780 * shows us the cookie-ack was lost. Imply it was 5781 * there. 5782 */ 5783 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net); 5784 break; 5785 case SCTP_STATE_COOKIE_WAIT: 5786 /* 5787 * We consider OOTB any data sent during asoc setup. 5788 */ 5789 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5790 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5791 msg); 5792 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5793 mflowtype, mflowid, inp->fibnum, 5794 vrf_id, port); 5795 goto out; 5796 /* sa_ignore NOTREACHED */ 5797 break; 5798 case SCTP_STATE_EMPTY: /* should not happen */ 5799 case SCTP_STATE_INUSE: /* should not happen */ 5800 case SCTP_STATE_SHUTDOWN_RECEIVED: /* This is a peer error */ 5801 case SCTP_STATE_SHUTDOWN_ACK_SENT: 5802 default: 5803 goto out; 5804 /* sa_ignore NOTREACHED */ 5805 break; 5806 case SCTP_STATE_OPEN: 5807 case SCTP_STATE_SHUTDOWN_SENT: 5808 break; 5809 } 5810 /* plow through the data chunks while length > offset */ 5811 retval = sctp_process_data(mm, iphlen, &offset, length, 5812 inp, stcb, net, &high_tsn); 5813 if (retval == 2) { 5814 /* 5815 * The association aborted, NO UNLOCK needed since 5816 * the association is destroyed. 5817 */ 5818 stcb = NULL; 5819 goto out; 5820 } 5821 data_processed = 1; 5822 /* 5823 * Anything important needs to have been m_copy'ed in 5824 * process_data 5825 */ 5826 } 5827 5828 /* take care of ecn */ 5829 if ((data_processed == 1) && 5830 (stcb->asoc.ecn_supported == 1) && 5831 ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) { 5832 /* Yep, we need to add a ECNE */ 5833 sctp_send_ecn_echo(stcb, net, high_tsn); 5834 } 5835 5836 if ((data_processed == 0) && (fwd_tsn_seen)) { 5837 int was_a_gap; 5838 uint32_t highest_tsn; 5839 5840 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) { 5841 highest_tsn = stcb->asoc.highest_tsn_inside_nr_map; 5842 } else { 5843 highest_tsn = stcb->asoc.highest_tsn_inside_map; 5844 } 5845 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn); 5846 stcb->asoc.send_sack = 1; 5847 sctp_sack_check(stcb, was_a_gap); 5848 } else if (fwd_tsn_seen) { 5849 stcb->asoc.send_sack = 1; 5850 } 5851 /* trigger send of any chunks in queue... */ 5852 trigger_send: 5853 #ifdef SCTP_AUDITING_ENABLED 5854 sctp_audit_log(0xE0, 2); 5855 sctp_auditing(1, inp, stcb, net); 5856 #endif 5857 SCTPDBG(SCTP_DEBUG_INPUT1, 5858 "Check for chunk output prw:%d tqe:%d tf=%d\n", 5859 stcb->asoc.peers_rwnd, 5860 TAILQ_EMPTY(&stcb->asoc.control_send_queue), 5861 stcb->asoc.total_flight); 5862 un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight); 5863 if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 5864 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq; 5865 } 5866 if (!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue) || 5867 cnt_ctrl_ready || 5868 stcb->asoc.trigger_reset || 5869 ((un_sent) && 5870 (stcb->asoc.peers_rwnd > 0 || 5871 (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) { 5872 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n"); 5873 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 5874 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n"); 5875 } 5876 #ifdef SCTP_AUDITING_ENABLED 5877 sctp_audit_log(0xE0, 3); 5878 sctp_auditing(2, inp, stcb, net); 5879 #endif 5880 out: 5881 if (stcb != NULL) { 5882 SCTP_TCB_UNLOCK(stcb); 5883 } 5884 if (inp_decr != NULL) { 5885 /* reduce ref-count */ 5886 SCTP_INP_WLOCK(inp_decr); 5887 SCTP_INP_DECR_REF(inp_decr); 5888 SCTP_INP_WUNLOCK(inp_decr); 5889 } 5890 return; 5891 } 5892 5893 #ifdef INET 5894 void 5895 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port) 5896 { 5897 struct mbuf *m; 5898 int iphlen; 5899 uint32_t vrf_id = 0; 5900 uint8_t ecn_bits; 5901 struct sockaddr_in src, dst; 5902 struct ip *ip; 5903 struct sctphdr *sh; 5904 struct sctp_chunkhdr *ch; 5905 int length, offset; 5906 uint8_t compute_crc; 5907 uint32_t mflowid; 5908 uint8_t mflowtype; 5909 uint16_t fibnum; 5910 5911 iphlen = off; 5912 if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) { 5913 SCTP_RELEASE_PKT(i_pak); 5914 return; 5915 } 5916 m = SCTP_HEADER_TO_CHAIN(i_pak); 5917 #ifdef SCTP_MBUF_LOGGING 5918 /* Log in any input mbufs */ 5919 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5920 sctp_log_mbc(m, SCTP_MBUF_INPUT); 5921 } 5922 #endif 5923 #ifdef SCTP_PACKET_LOGGING 5924 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) { 5925 sctp_packet_log(m); 5926 } 5927 #endif 5928 SCTPDBG(SCTP_DEBUG_CRCOFFLOAD, 5929 "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n", 5930 m->m_pkthdr.len, 5931 if_name(m->m_pkthdr.rcvif), 5932 (int)m->m_pkthdr.csum_flags, CSUM_BITS); 5933 mflowid = m->m_pkthdr.flowid; 5934 mflowtype = M_HASHTYPE_GET(m); 5935 fibnum = M_GETFIB(m); 5936 SCTP_STAT_INCR(sctps_recvpackets); 5937 SCTP_STAT_INCR_COUNTER64(sctps_inpackets); 5938 /* Get IP, SCTP, and first chunk header together in the first mbuf. */ 5939 offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr); 5940 if (SCTP_BUF_LEN(m) < offset) { 5941 if ((m = m_pullup(m, offset)) == NULL) { 5942 SCTP_STAT_INCR(sctps_hdrops); 5943 return; 5944 } 5945 } 5946 ip = mtod(m, struct ip *); 5947 sh = (struct sctphdr *)((caddr_t)ip + iphlen); 5948 ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr)); 5949 offset -= sizeof(struct sctp_chunkhdr); 5950 memset(&src, 0, sizeof(struct sockaddr_in)); 5951 src.sin_family = AF_INET; 5952 src.sin_len = sizeof(struct sockaddr_in); 5953 src.sin_port = sh->src_port; 5954 src.sin_addr = ip->ip_src; 5955 memset(&dst, 0, sizeof(struct sockaddr_in)); 5956 dst.sin_family = AF_INET; 5957 dst.sin_len = sizeof(struct sockaddr_in); 5958 dst.sin_port = sh->dest_port; 5959 dst.sin_addr = ip->ip_dst; 5960 length = ntohs(ip->ip_len); 5961 /* Validate mbuf chain length with IP payload length. */ 5962 if (SCTP_HEADER_LEN(m) != length) { 5963 SCTPDBG(SCTP_DEBUG_INPUT1, 5964 "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m)); 5965 SCTP_STAT_INCR(sctps_hdrops); 5966 goto out; 5967 } 5968 /* SCTP does not allow broadcasts or multicasts */ 5969 if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) { 5970 goto out; 5971 } 5972 if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) { 5973 goto out; 5974 } 5975 ecn_bits = ip->ip_tos; 5976 if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) { 5977 SCTP_STAT_INCR(sctps_recvhwcrc); 5978 compute_crc = 0; 5979 } else { 5980 SCTP_STAT_INCR(sctps_recvswcrc); 5981 compute_crc = 1; 5982 } 5983 sctp_common_input_processing(&m, iphlen, offset, length, 5984 (struct sockaddr *)&src, 5985 (struct sockaddr *)&dst, 5986 sh, ch, 5987 compute_crc, 5988 ecn_bits, 5989 mflowtype, mflowid, fibnum, 5990 vrf_id, port); 5991 out: 5992 if (m) { 5993 sctp_m_freem(m); 5994 } 5995 return; 5996 } 5997 5998 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP) 5999 extern int *sctp_cpuarry; 6000 #endif 6001 6002 int 6003 sctp_input(struct mbuf **mp, int *offp, int proto SCTP_UNUSED) 6004 { 6005 struct mbuf *m; 6006 int off; 6007 6008 m = *mp; 6009 off = *offp; 6010 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP) 6011 if (mp_ncpus > 1) { 6012 struct ip *ip; 6013 struct sctphdr *sh; 6014 int offset; 6015 int cpu_to_use; 6016 uint32_t flowid, tag; 6017 6018 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) { 6019 flowid = m->m_pkthdr.flowid; 6020 } else { 6021 /* 6022 * No flow id built by lower layers fix it so we 6023 * create one. 6024 */ 6025 offset = off + sizeof(struct sctphdr); 6026 if (SCTP_BUF_LEN(m) < offset) { 6027 if ((m = m_pullup(m, offset)) == NULL) { 6028 SCTP_STAT_INCR(sctps_hdrops); 6029 return (IPPROTO_DONE); 6030 } 6031 } 6032 ip = mtod(m, struct ip *); 6033 sh = (struct sctphdr *)((caddr_t)ip + off); 6034 tag = htonl(sh->v_tag); 6035 flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port); 6036 m->m_pkthdr.flowid = flowid; 6037 M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE_HASH); 6038 } 6039 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus]; 6040 sctp_queue_to_mcore(m, off, cpu_to_use); 6041 return (IPPROTO_DONE); 6042 } 6043 #endif 6044 sctp_input_with_port(m, off, 0); 6045 return (IPPROTO_DONE); 6046 } 6047 #endif 6048