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 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3235 struct socket *so; 3236 #endif 3237 3238 SCTPDBG(SCTP_DEBUG_INPUT2, 3239 "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n"); 3240 if (stcb == NULL) 3241 return; 3242 3243 /* process according to association state */ 3244 if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 3245 /* unexpected SHUTDOWN-COMPLETE... so ignore... */ 3246 SCTPDBG(SCTP_DEBUG_INPUT2, 3247 "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n"); 3248 SCTP_TCB_UNLOCK(stcb); 3249 return; 3250 } 3251 /* notify upper layer protocol */ 3252 if (stcb->sctp_socket) { 3253 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 3254 } 3255 #ifdef INVARIANTS 3256 if (!TAILQ_EMPTY(&stcb->asoc.send_queue) || 3257 !TAILQ_EMPTY(&stcb->asoc.sent_queue) || 3258 sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) { 3259 panic("Queues are not empty when handling SHUTDOWN-COMPLETE"); 3260 } 3261 #endif 3262 /* stop the timer */ 3263 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, 3264 SCTP_FROM_SCTP_INPUT + SCTP_LOC_24); 3265 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 3266 /* free the TCB */ 3267 SCTPDBG(SCTP_DEBUG_INPUT2, 3268 "sctp_handle_shutdown_complete: calls free-asoc\n"); 3269 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3270 so = SCTP_INP_SO(stcb->sctp_ep); 3271 atomic_add_int(&stcb->asoc.refcnt, 1); 3272 SCTP_TCB_UNLOCK(stcb); 3273 SCTP_SOCKET_LOCK(so, 1); 3274 SCTP_TCB_LOCK(stcb); 3275 atomic_subtract_int(&stcb->asoc.refcnt, 1); 3276 #endif 3277 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 3278 SCTP_FROM_SCTP_INPUT + SCTP_LOC_25); 3279 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3280 SCTP_SOCKET_UNLOCK(so, 1); 3281 #endif 3282 return; 3283 } 3284 3285 static int 3286 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc, 3287 struct sctp_nets *net, uint8_t flg) 3288 { 3289 switch (desc->chunk_type) { 3290 case SCTP_DATA: 3291 /* find the tsn to resend (possibly */ 3292 { 3293 uint32_t tsn; 3294 struct sctp_tmit_chunk *tp1; 3295 3296 tsn = ntohl(desc->tsn_ifany); 3297 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3298 if (tp1->rec.data.tsn == tsn) { 3299 /* found it */ 3300 break; 3301 } 3302 if (SCTP_TSN_GT(tp1->rec.data.tsn, tsn)) { 3303 /* not found */ 3304 tp1 = NULL; 3305 break; 3306 } 3307 } 3308 if (tp1 == NULL) { 3309 /* 3310 * Do it the other way , aka without paying 3311 * attention to queue seq order. 3312 */ 3313 SCTP_STAT_INCR(sctps_pdrpdnfnd); 3314 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3315 if (tp1->rec.data.tsn == tsn) { 3316 /* found it */ 3317 break; 3318 } 3319 } 3320 } 3321 if (tp1 == NULL) { 3322 SCTP_STAT_INCR(sctps_pdrptsnnf); 3323 } 3324 if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) { 3325 uint8_t *ddp; 3326 3327 if (((flg & SCTP_BADCRC) == 0) && 3328 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3329 return (0); 3330 } 3331 if ((stcb->asoc.peers_rwnd == 0) && 3332 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3333 SCTP_STAT_INCR(sctps_pdrpdiwnp); 3334 return (0); 3335 } 3336 if (stcb->asoc.peers_rwnd == 0 && 3337 (flg & SCTP_FROM_MIDDLE_BOX)) { 3338 SCTP_STAT_INCR(sctps_pdrpdizrw); 3339 return (0); 3340 } 3341 ddp = (uint8_t *)(mtod(tp1->data, caddr_t)+ 3342 sizeof(struct sctp_data_chunk)); 3343 { 3344 unsigned int iii; 3345 3346 for (iii = 0; iii < sizeof(desc->data_bytes); 3347 iii++) { 3348 if (ddp[iii] != desc->data_bytes[iii]) { 3349 SCTP_STAT_INCR(sctps_pdrpbadd); 3350 return (-1); 3351 } 3352 } 3353 } 3354 3355 if (tp1->do_rtt) { 3356 /* 3357 * this guy had a RTO calculation 3358 * pending on it, cancel it 3359 */ 3360 if (tp1->whoTo->rto_needed == 0) { 3361 tp1->whoTo->rto_needed = 1; 3362 } 3363 tp1->do_rtt = 0; 3364 } 3365 SCTP_STAT_INCR(sctps_pdrpmark); 3366 if (tp1->sent != SCTP_DATAGRAM_RESEND) 3367 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3368 /* 3369 * mark it as if we were doing a FR, since 3370 * we will be getting gap ack reports behind 3371 * the info from the router. 3372 */ 3373 tp1->rec.data.doing_fast_retransmit = 1; 3374 /* 3375 * mark the tsn with what sequences can 3376 * cause a new FR. 3377 */ 3378 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) { 3379 tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq; 3380 } else { 3381 tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.tsn; 3382 } 3383 3384 /* restart the timer */ 3385 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3386 stcb, tp1->whoTo, 3387 SCTP_FROM_SCTP_INPUT + SCTP_LOC_26); 3388 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3389 stcb, tp1->whoTo); 3390 3391 /* fix counts and things */ 3392 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 3393 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP, 3394 tp1->whoTo->flight_size, 3395 tp1->book_size, 3396 (uint32_t)(uintptr_t)stcb, 3397 tp1->rec.data.tsn); 3398 } 3399 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3400 sctp_flight_size_decrease(tp1); 3401 sctp_total_flight_decrease(stcb, tp1); 3402 } 3403 tp1->sent = SCTP_DATAGRAM_RESEND; 3404 } { 3405 /* audit code */ 3406 unsigned int audit; 3407 3408 audit = 0; 3409 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3410 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3411 audit++; 3412 } 3413 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue, 3414 sctp_next) { 3415 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3416 audit++; 3417 } 3418 if (audit != stcb->asoc.sent_queue_retran_cnt) { 3419 SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n", 3420 audit, stcb->asoc.sent_queue_retran_cnt); 3421 #ifndef SCTP_AUDITING_ENABLED 3422 stcb->asoc.sent_queue_retran_cnt = audit; 3423 #endif 3424 } 3425 } 3426 } 3427 break; 3428 case SCTP_ASCONF: 3429 { 3430 struct sctp_tmit_chunk *asconf; 3431 3432 TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue, 3433 sctp_next) { 3434 if (asconf->rec.chunk_id.id == SCTP_ASCONF) { 3435 break; 3436 } 3437 } 3438 if (asconf) { 3439 if (asconf->sent != SCTP_DATAGRAM_RESEND) 3440 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3441 asconf->sent = SCTP_DATAGRAM_RESEND; 3442 asconf->snd_count--; 3443 } 3444 } 3445 break; 3446 case SCTP_INITIATION: 3447 /* resend the INIT */ 3448 stcb->asoc.dropped_special_cnt++; 3449 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) { 3450 /* 3451 * If we can get it in, in a few attempts we do 3452 * this, otherwise we let the timer fire. 3453 */ 3454 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, 3455 stcb, net, 3456 SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 3457 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 3458 } 3459 break; 3460 case SCTP_SELECTIVE_ACK: 3461 case SCTP_NR_SELECTIVE_ACK: 3462 /* resend the sack */ 3463 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED); 3464 break; 3465 case SCTP_HEARTBEAT_REQUEST: 3466 /* resend a demand HB */ 3467 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) { 3468 /* 3469 * Only retransmit if we KNOW we wont destroy the 3470 * tcb 3471 */ 3472 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 3473 } 3474 break; 3475 case SCTP_SHUTDOWN: 3476 sctp_send_shutdown(stcb, net); 3477 break; 3478 case SCTP_SHUTDOWN_ACK: 3479 sctp_send_shutdown_ack(stcb, net); 3480 break; 3481 case SCTP_COOKIE_ECHO: 3482 { 3483 struct sctp_tmit_chunk *cookie; 3484 3485 cookie = NULL; 3486 TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, 3487 sctp_next) { 3488 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) { 3489 break; 3490 } 3491 } 3492 if (cookie) { 3493 if (cookie->sent != SCTP_DATAGRAM_RESEND) 3494 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3495 cookie->sent = SCTP_DATAGRAM_RESEND; 3496 sctp_stop_all_cookie_timers(stcb); 3497 } 3498 } 3499 break; 3500 case SCTP_COOKIE_ACK: 3501 sctp_send_cookie_ack(stcb); 3502 break; 3503 case SCTP_ASCONF_ACK: 3504 /* resend last asconf ack */ 3505 sctp_send_asconf_ack(stcb); 3506 break; 3507 case SCTP_IFORWARD_CUM_TSN: 3508 case SCTP_FORWARD_CUM_TSN: 3509 send_forward_tsn(stcb, &stcb->asoc); 3510 break; 3511 /* can't do anything with these */ 3512 case SCTP_PACKET_DROPPED: 3513 case SCTP_INITIATION_ACK: /* this should not happen */ 3514 case SCTP_HEARTBEAT_ACK: 3515 case SCTP_ABORT_ASSOCIATION: 3516 case SCTP_OPERATION_ERROR: 3517 case SCTP_SHUTDOWN_COMPLETE: 3518 case SCTP_ECN_ECHO: 3519 case SCTP_ECN_CWR: 3520 default: 3521 break; 3522 } 3523 return (0); 3524 } 3525 3526 void 3527 sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list) 3528 { 3529 uint32_t i; 3530 uint16_t temp; 3531 3532 /* 3533 * We set things to 0xffffffff since this is the last delivered 3534 * sequence and we will be sending in 0 after the reset. 3535 */ 3536 3537 if (number_entries) { 3538 for (i = 0; i < number_entries; i++) { 3539 temp = ntohs(list[i]); 3540 if (temp >= stcb->asoc.streamincnt) { 3541 continue; 3542 } 3543 stcb->asoc.strmin[temp].last_mid_delivered = 0xffffffff; 3544 } 3545 } else { 3546 list = NULL; 3547 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3548 stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff; 3549 } 3550 } 3551 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3552 } 3553 3554 static void 3555 sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list) 3556 { 3557 uint32_t i; 3558 uint16_t temp; 3559 3560 if (number_entries > 0) { 3561 for (i = 0; i < number_entries; i++) { 3562 temp = ntohs(list[i]); 3563 if (temp >= stcb->asoc.streamoutcnt) { 3564 /* no such stream */ 3565 continue; 3566 } 3567 stcb->asoc.strmout[temp].next_mid_ordered = 0; 3568 stcb->asoc.strmout[temp].next_mid_unordered = 0; 3569 } 3570 } else { 3571 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3572 stcb->asoc.strmout[i].next_mid_ordered = 0; 3573 stcb->asoc.strmout[i].next_mid_unordered = 0; 3574 } 3575 } 3576 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3577 } 3578 3579 static void 3580 sctp_reset_clear_pending(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list) 3581 { 3582 uint32_t i; 3583 uint16_t temp; 3584 3585 if (number_entries > 0) { 3586 for (i = 0; i < number_entries; i++) { 3587 temp = ntohs(list[i]); 3588 if (temp >= stcb->asoc.streamoutcnt) { 3589 /* no such stream */ 3590 continue; 3591 } 3592 stcb->asoc.strmout[temp].state = SCTP_STREAM_OPEN; 3593 } 3594 } else { 3595 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3596 stcb->asoc.strmout[i].state = SCTP_STREAM_OPEN; 3597 } 3598 } 3599 } 3600 3601 3602 struct sctp_stream_reset_request * 3603 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk) 3604 { 3605 struct sctp_association *asoc; 3606 struct sctp_chunkhdr *ch; 3607 struct sctp_stream_reset_request *r; 3608 struct sctp_tmit_chunk *chk; 3609 int len, clen; 3610 3611 asoc = &stcb->asoc; 3612 if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 3613 asoc->stream_reset_outstanding = 0; 3614 return (NULL); 3615 } 3616 if (stcb->asoc.str_reset == NULL) { 3617 asoc->stream_reset_outstanding = 0; 3618 return (NULL); 3619 } 3620 chk = stcb->asoc.str_reset; 3621 if (chk->data == NULL) { 3622 return (NULL); 3623 } 3624 if (bchk) { 3625 /* he wants a copy of the chk pointer */ 3626 *bchk = chk; 3627 } 3628 clen = chk->send_size; 3629 ch = mtod(chk->data, struct sctp_chunkhdr *); 3630 r = (struct sctp_stream_reset_request *)(ch + 1); 3631 if (ntohl(r->request_seq) == seq) { 3632 /* found it */ 3633 return (r); 3634 } 3635 len = SCTP_SIZE32(ntohs(r->ph.param_length)); 3636 if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) { 3637 /* move to the next one, there can only be a max of two */ 3638 r = (struct sctp_stream_reset_request *)((caddr_t)r + len); 3639 if (ntohl(r->request_seq) == seq) { 3640 return (r); 3641 } 3642 } 3643 /* that seq is not here */ 3644 return (NULL); 3645 } 3646 3647 static void 3648 sctp_clean_up_stream_reset(struct sctp_tcb *stcb) 3649 { 3650 struct sctp_association *asoc; 3651 struct sctp_tmit_chunk *chk; 3652 3653 asoc = &stcb->asoc; 3654 chk = asoc->str_reset; 3655 if (chk == NULL) { 3656 return; 3657 } 3658 asoc->str_reset = NULL; 3659 sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, 3660 chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_28); 3661 TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next); 3662 asoc->ctrl_queue_cnt--; 3663 if (chk->data) { 3664 sctp_m_freem(chk->data); 3665 chk->data = NULL; 3666 } 3667 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3668 } 3669 3670 3671 static int 3672 sctp_handle_stream_reset_response(struct sctp_tcb *stcb, 3673 uint32_t seq, uint32_t action, 3674 struct sctp_stream_reset_response *respin) 3675 { 3676 uint16_t type; 3677 int lparam_len; 3678 struct sctp_association *asoc = &stcb->asoc; 3679 struct sctp_tmit_chunk *chk; 3680 struct sctp_stream_reset_request *req_param; 3681 struct sctp_stream_reset_out_request *req_out_param; 3682 struct sctp_stream_reset_in_request *req_in_param; 3683 uint32_t number_entries; 3684 3685 if (asoc->stream_reset_outstanding == 0) { 3686 /* duplicate */ 3687 return (0); 3688 } 3689 if (seq == stcb->asoc.str_reset_seq_out) { 3690 req_param = sctp_find_stream_reset(stcb, seq, &chk); 3691 if (req_param != NULL) { 3692 stcb->asoc.str_reset_seq_out++; 3693 type = ntohs(req_param->ph.param_type); 3694 lparam_len = ntohs(req_param->ph.param_length); 3695 if (type == SCTP_STR_RESET_OUT_REQUEST) { 3696 int no_clear = 0; 3697 3698 req_out_param = (struct sctp_stream_reset_out_request *)req_param; 3699 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t); 3700 asoc->stream_reset_out_is_outstanding = 0; 3701 if (asoc->stream_reset_outstanding) 3702 asoc->stream_reset_outstanding--; 3703 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3704 /* do it */ 3705 sctp_reset_out_streams(stcb, number_entries, req_out_param->list_of_streams); 3706 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3707 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3708 } else if (action == SCTP_STREAM_RESET_RESULT_IN_PROGRESS) { 3709 /* 3710 * Set it up so we don't stop 3711 * retransmitting 3712 */ 3713 asoc->stream_reset_outstanding++; 3714 stcb->asoc.str_reset_seq_out--; 3715 asoc->stream_reset_out_is_outstanding = 1; 3716 no_clear = 1; 3717 } else { 3718 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3719 } 3720 if (no_clear == 0) { 3721 sctp_reset_clear_pending(stcb, number_entries, req_out_param->list_of_streams); 3722 } 3723 } else if (type == SCTP_STR_RESET_IN_REQUEST) { 3724 req_in_param = (struct sctp_stream_reset_in_request *)req_param; 3725 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t); 3726 if (asoc->stream_reset_outstanding) 3727 asoc->stream_reset_outstanding--; 3728 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3729 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb, 3730 number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3731 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3732 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb, 3733 number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3734 } 3735 } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) { 3736 /* Ok we now may have more streams */ 3737 int num_stream; 3738 3739 num_stream = stcb->asoc.strm_pending_add_size; 3740 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) { 3741 /* TSNH */ 3742 num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt; 3743 } 3744 stcb->asoc.strm_pending_add_size = 0; 3745 if (asoc->stream_reset_outstanding) 3746 asoc->stream_reset_outstanding--; 3747 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3748 /* Put the new streams into effect */ 3749 int i; 3750 3751 for (i = asoc->streamoutcnt; i < (asoc->streamoutcnt + num_stream); i++) { 3752 asoc->strmout[i].state = SCTP_STREAM_OPEN; 3753 } 3754 asoc->streamoutcnt += num_stream; 3755 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 3756 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3757 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3758 SCTP_STREAM_CHANGE_DENIED); 3759 } else { 3760 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3761 SCTP_STREAM_CHANGE_FAILED); 3762 } 3763 } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) { 3764 if (asoc->stream_reset_outstanding) 3765 asoc->stream_reset_outstanding--; 3766 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3767 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3768 SCTP_STREAM_CHANGE_DENIED); 3769 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3770 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3771 SCTP_STREAM_CHANGE_FAILED); 3772 } 3773 } else if (type == SCTP_STR_RESET_TSN_REQUEST) { 3774 /** 3775 * a) Adopt the new in tsn. 3776 * b) reset the map 3777 * c) Adopt the new out-tsn 3778 */ 3779 struct sctp_stream_reset_response_tsn *resp; 3780 struct sctp_forward_tsn_chunk fwdtsn; 3781 int abort_flag = 0; 3782 3783 if (respin == NULL) { 3784 /* huh ? */ 3785 return (0); 3786 } 3787 if (ntohs(respin->ph.param_length) < sizeof(struct sctp_stream_reset_response_tsn)) { 3788 return (0); 3789 } 3790 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3791 resp = (struct sctp_stream_reset_response_tsn *)respin; 3792 asoc->stream_reset_outstanding--; 3793 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3794 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3795 fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1); 3796 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3797 if (abort_flag) { 3798 return (1); 3799 } 3800 stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1); 3801 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3802 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3803 } 3804 3805 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 3806 stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn); 3807 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 3808 3809 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map; 3810 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size); 3811 3812 stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn); 3813 stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn; 3814 3815 sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL); 3816 sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL); 3817 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0); 3818 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3819 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3820 SCTP_ASSOC_RESET_DENIED); 3821 } else { 3822 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3823 SCTP_ASSOC_RESET_FAILED); 3824 } 3825 } 3826 /* get rid of the request and get the request flags */ 3827 if (asoc->stream_reset_outstanding == 0) { 3828 sctp_clean_up_stream_reset(stcb); 3829 } 3830 } 3831 } 3832 if (asoc->stream_reset_outstanding == 0) { 3833 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED); 3834 } 3835 return (0); 3836 } 3837 3838 static void 3839 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb, 3840 struct sctp_tmit_chunk *chk, 3841 struct sctp_stream_reset_in_request *req, int trunc) 3842 { 3843 uint32_t seq; 3844 int len, i; 3845 int number_entries; 3846 uint16_t temp; 3847 3848 /* 3849 * peer wants me to send a str-reset to him for my outgoing seq's if 3850 * seq_in is right. 3851 */ 3852 struct sctp_association *asoc = &stcb->asoc; 3853 3854 seq = ntohl(req->request_seq); 3855 if (asoc->str_reset_seq_in == seq) { 3856 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3857 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3858 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3859 } else if (trunc) { 3860 /* Can't do it, since they exceeded our buffer size */ 3861 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3862 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) { 3863 len = ntohs(req->ph.param_length); 3864 number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t)); 3865 if (number_entries) { 3866 for (i = 0; i < number_entries; i++) { 3867 temp = ntohs(req->list_of_streams[i]); 3868 if (temp >= stcb->asoc.streamoutcnt) { 3869 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3870 goto bad_boy; 3871 } 3872 req->list_of_streams[i] = temp; 3873 } 3874 for (i = 0; i < number_entries; i++) { 3875 if (stcb->asoc.strmout[req->list_of_streams[i]].state == SCTP_STREAM_OPEN) { 3876 stcb->asoc.strmout[req->list_of_streams[i]].state = SCTP_STREAM_RESET_PENDING; 3877 } 3878 } 3879 } else { 3880 /* Its all */ 3881 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3882 if (stcb->asoc.strmout[i].state == SCTP_STREAM_OPEN) 3883 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_PENDING; 3884 } 3885 } 3886 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3887 } else { 3888 /* Can't do it, since we have sent one out */ 3889 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 3890 } 3891 bad_boy: 3892 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3893 asoc->str_reset_seq_in++; 3894 } else if (asoc->str_reset_seq_in - 1 == seq) { 3895 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3896 } else if (asoc->str_reset_seq_in - 2 == seq) { 3897 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3898 } else { 3899 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3900 } 3901 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED); 3902 } 3903 3904 static int 3905 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb, 3906 struct sctp_tmit_chunk *chk, 3907 struct sctp_stream_reset_tsn_request *req) 3908 { 3909 /* reset all in and out and update the tsn */ 3910 /* 3911 * A) reset my str-seq's on in and out. B) Select a receive next, 3912 * and set cum-ack to it. Also process this selected number as a 3913 * fwd-tsn as well. C) set in the response my next sending seq. 3914 */ 3915 struct sctp_forward_tsn_chunk fwdtsn; 3916 struct sctp_association *asoc = &stcb->asoc; 3917 int abort_flag = 0; 3918 uint32_t seq; 3919 3920 seq = ntohl(req->request_seq); 3921 if (asoc->str_reset_seq_in == seq) { 3922 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3923 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 3924 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3925 } else { 3926 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3927 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3928 fwdtsn.ch.chunk_flags = 0; 3929 fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1); 3930 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3931 if (abort_flag) { 3932 return (1); 3933 } 3934 asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA; 3935 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3936 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3937 } 3938 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map; 3939 asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1; 3940 memset(asoc->mapping_array, 0, asoc->mapping_array_size); 3941 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 3942 memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size); 3943 atomic_add_int(&asoc->sending_seq, 1); 3944 /* save off historical data for retrans */ 3945 asoc->last_sending_seq[1] = asoc->last_sending_seq[0]; 3946 asoc->last_sending_seq[0] = asoc->sending_seq; 3947 asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0]; 3948 asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn; 3949 sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL); 3950 sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL); 3951 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3952 sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0); 3953 } 3954 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3955 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3956 asoc->str_reset_seq_in++; 3957 } else if (asoc->str_reset_seq_in - 1 == seq) { 3958 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3959 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3960 } else if (asoc->str_reset_seq_in - 2 == seq) { 3961 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1], 3962 asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]); 3963 } else { 3964 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3965 } 3966 return (0); 3967 } 3968 3969 static void 3970 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb, 3971 struct sctp_tmit_chunk *chk, 3972 struct sctp_stream_reset_out_request *req, int trunc) 3973 { 3974 uint32_t seq, tsn; 3975 int number_entries, len; 3976 struct sctp_association *asoc = &stcb->asoc; 3977 3978 seq = ntohl(req->request_seq); 3979 3980 /* now if its not a duplicate we process it */ 3981 if (asoc->str_reset_seq_in == seq) { 3982 len = ntohs(req->ph.param_length); 3983 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t)); 3984 /* 3985 * the sender is resetting, handle the list issue.. we must 3986 * a) verify if we can do the reset, if so no problem b) If 3987 * we can't do the reset we must copy the request. c) queue 3988 * it, and setup the data in processor to trigger it off 3989 * when needed and dequeue all the queued data. 3990 */ 3991 tsn = ntohl(req->send_reset_at_tsn); 3992 3993 /* move the reset action back one */ 3994 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3995 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3996 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3997 } else if (trunc) { 3998 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3999 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) { 4000 /* we can do it now */ 4001 sctp_reset_in_stream(stcb, number_entries, req->list_of_streams); 4002 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 4003 } else { 4004 /* 4005 * we must queue it up and thus wait for the TSN's 4006 * to arrive that are at or before tsn 4007 */ 4008 struct sctp_stream_reset_list *liste; 4009 int siz; 4010 4011 siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t)); 4012 SCTP_MALLOC(liste, struct sctp_stream_reset_list *, 4013 siz, SCTP_M_STRESET); 4014 if (liste == NULL) { 4015 /* gak out of memory */ 4016 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4017 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4018 return; 4019 } 4020 liste->seq = seq; 4021 liste->tsn = tsn; 4022 liste->number_entries = number_entries; 4023 memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t)); 4024 TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp); 4025 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_IN_PROGRESS; 4026 } 4027 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4028 asoc->str_reset_seq_in++; 4029 } else if ((asoc->str_reset_seq_in - 1) == seq) { 4030 /* 4031 * one seq back, just echo back last action since my 4032 * response was lost. 4033 */ 4034 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4035 } else if ((asoc->str_reset_seq_in - 2) == seq) { 4036 /* 4037 * two seq back, just echo back last action since my 4038 * response was lost. 4039 */ 4040 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 4041 } else { 4042 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 4043 } 4044 } 4045 4046 static void 4047 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 4048 struct sctp_stream_reset_add_strm *str_add) 4049 { 4050 /* 4051 * Peer is requesting to add more streams. If its within our 4052 * max-streams we will allow it. 4053 */ 4054 uint32_t num_stream, i; 4055 uint32_t seq; 4056 struct sctp_association *asoc = &stcb->asoc; 4057 struct sctp_queued_to_read *ctl, *nctl; 4058 4059 /* Get the number. */ 4060 seq = ntohl(str_add->request_seq); 4061 num_stream = ntohs(str_add->number_of_streams); 4062 /* Now what would be the new total? */ 4063 if (asoc->str_reset_seq_in == seq) { 4064 num_stream += stcb->asoc.streamincnt; 4065 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 4066 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 4067 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4068 } else if ((num_stream > stcb->asoc.max_inbound_streams) || 4069 (num_stream > 0xffff)) { 4070 /* We must reject it they ask for to many */ 4071 denied: 4072 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4073 } else { 4074 /* Ok, we can do that :-) */ 4075 struct sctp_stream_in *oldstrm; 4076 4077 /* save off the old */ 4078 oldstrm = stcb->asoc.strmin; 4079 SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *, 4080 (num_stream * sizeof(struct sctp_stream_in)), 4081 SCTP_M_STRMI); 4082 if (stcb->asoc.strmin == NULL) { 4083 stcb->asoc.strmin = oldstrm; 4084 goto denied; 4085 } 4086 /* copy off the old data */ 4087 for (i = 0; i < stcb->asoc.streamincnt; i++) { 4088 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 4089 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue); 4090 stcb->asoc.strmin[i].sid = i; 4091 stcb->asoc.strmin[i].last_mid_delivered = oldstrm[i].last_mid_delivered; 4092 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started; 4093 stcb->asoc.strmin[i].pd_api_started = oldstrm[i].pd_api_started; 4094 /* now anything on those queues? */ 4095 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next_instrm, nctl) { 4096 TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next_instrm); 4097 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next_instrm); 4098 } 4099 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].uno_inqueue, next_instrm, nctl) { 4100 TAILQ_REMOVE(&oldstrm[i].uno_inqueue, ctl, next_instrm); 4101 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].uno_inqueue, ctl, next_instrm); 4102 } 4103 } 4104 /* Init the new streams */ 4105 for (i = stcb->asoc.streamincnt; i < num_stream; i++) { 4106 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 4107 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue); 4108 stcb->asoc.strmin[i].sid = i; 4109 stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff; 4110 stcb->asoc.strmin[i].pd_api_started = 0; 4111 stcb->asoc.strmin[i].delivery_started = 0; 4112 } 4113 SCTP_FREE(oldstrm, SCTP_M_STRMI); 4114 /* update the size */ 4115 stcb->asoc.streamincnt = num_stream; 4116 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 4117 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 4118 } 4119 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4120 asoc->str_reset_seq_in++; 4121 } else if ((asoc->str_reset_seq_in - 1) == seq) { 4122 /* 4123 * one seq back, just echo back last action since my 4124 * response was lost. 4125 */ 4126 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4127 } else if ((asoc->str_reset_seq_in - 2) == seq) { 4128 /* 4129 * two seq back, just echo back last action since my 4130 * response was lost. 4131 */ 4132 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 4133 } else { 4134 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 4135 4136 } 4137 } 4138 4139 static void 4140 sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 4141 struct sctp_stream_reset_add_strm *str_add) 4142 { 4143 /* 4144 * Peer is requesting to add more streams. If its within our 4145 * max-streams we will allow it. 4146 */ 4147 uint16_t num_stream; 4148 uint32_t seq; 4149 struct sctp_association *asoc = &stcb->asoc; 4150 4151 /* Get the number. */ 4152 seq = ntohl(str_add->request_seq); 4153 num_stream = ntohs(str_add->number_of_streams); 4154 /* Now what would be the new total? */ 4155 if (asoc->str_reset_seq_in == seq) { 4156 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 4157 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 4158 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4159 } else if (stcb->asoc.stream_reset_outstanding) { 4160 /* We must reject it we have something pending */ 4161 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 4162 } else { 4163 /* Ok, we can do that :-) */ 4164 int mychk; 4165 4166 mychk = stcb->asoc.streamoutcnt; 4167 mychk += num_stream; 4168 if (mychk < 0x10000) { 4169 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 4170 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 1, num_stream, 0, 1)) { 4171 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4172 } 4173 } else { 4174 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4175 } 4176 } 4177 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]); 4178 asoc->str_reset_seq_in++; 4179 } else if ((asoc->str_reset_seq_in - 1) == seq) { 4180 /* 4181 * one seq back, just echo back last action since my 4182 * response was lost. 4183 */ 4184 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4185 } else if ((asoc->str_reset_seq_in - 2) == seq) { 4186 /* 4187 * two seq back, just echo back last action since my 4188 * response was lost. 4189 */ 4190 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 4191 } else { 4192 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 4193 } 4194 } 4195 4196 #ifdef __GNUC__ 4197 __attribute__((noinline)) 4198 #endif 4199 static int 4200 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset, 4201 struct sctp_chunkhdr *ch_req) 4202 { 4203 uint16_t remaining_length, param_len, ptype; 4204 struct sctp_paramhdr pstore; 4205 uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE]; 4206 uint32_t seq = 0; 4207 int num_req = 0; 4208 int trunc = 0; 4209 struct sctp_tmit_chunk *chk; 4210 struct sctp_chunkhdr *ch; 4211 struct sctp_paramhdr *ph; 4212 int ret_code = 0; 4213 int num_param = 0; 4214 4215 /* now it may be a reset or a reset-response */ 4216 remaining_length = ntohs(ch_req->chunk_length) - sizeof(struct sctp_chunkhdr); 4217 4218 /* setup for adding the response */ 4219 sctp_alloc_a_chunk(stcb, chk); 4220 if (chk == NULL) { 4221 return (ret_code); 4222 } 4223 chk->copy_by_ref = 0; 4224 chk->rec.chunk_id.id = SCTP_STREAM_RESET; 4225 chk->rec.chunk_id.can_take_data = 0; 4226 chk->flags = 0; 4227 chk->asoc = &stcb->asoc; 4228 chk->no_fr_allowed = 0; 4229 chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr); 4230 chk->book_size_scale = 0; 4231 chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA); 4232 if (chk->data == NULL) { 4233 strres_nochunk: 4234 if (chk->data) { 4235 sctp_m_freem(chk->data); 4236 chk->data = NULL; 4237 } 4238 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 4239 return (ret_code); 4240 } 4241 SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD); 4242 4243 /* setup chunk parameters */ 4244 chk->sent = SCTP_DATAGRAM_UNSENT; 4245 chk->snd_count = 0; 4246 chk->whoTo = NULL; 4247 4248 ch = mtod(chk->data, struct sctp_chunkhdr *); 4249 ch->chunk_type = SCTP_STREAM_RESET; 4250 ch->chunk_flags = 0; 4251 ch->chunk_length = htons(chk->send_size); 4252 SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size); 4253 offset += sizeof(struct sctp_chunkhdr); 4254 while (remaining_length >= sizeof(struct sctp_paramhdr)) { 4255 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *)&pstore); 4256 if (ph == NULL) { 4257 /* TSNH */ 4258 break; 4259 } 4260 param_len = ntohs(ph->param_length); 4261 if ((param_len > remaining_length) || 4262 (param_len < (sizeof(struct sctp_paramhdr) + sizeof(uint32_t)))) { 4263 /* bad parameter length */ 4264 break; 4265 } 4266 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, sizeof(cstore)), 4267 (uint8_t *)&cstore); 4268 if (ph == NULL) { 4269 /* TSNH */ 4270 break; 4271 } 4272 ptype = ntohs(ph->param_type); 4273 num_param++; 4274 if (param_len > sizeof(cstore)) { 4275 trunc = 1; 4276 } else { 4277 trunc = 0; 4278 } 4279 if (num_param > SCTP_MAX_RESET_PARAMS) { 4280 /* hit the max of parameters already sorry.. */ 4281 break; 4282 } 4283 if (ptype == SCTP_STR_RESET_OUT_REQUEST) { 4284 struct sctp_stream_reset_out_request *req_out; 4285 4286 if (param_len < sizeof(struct sctp_stream_reset_out_request)) { 4287 break; 4288 } 4289 req_out = (struct sctp_stream_reset_out_request *)ph; 4290 num_req++; 4291 if (stcb->asoc.stream_reset_outstanding) { 4292 seq = ntohl(req_out->response_seq); 4293 if (seq == stcb->asoc.str_reset_seq_out) { 4294 /* implicit ack */ 4295 (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL); 4296 } 4297 } 4298 sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc); 4299 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) { 4300 struct sctp_stream_reset_add_strm *str_add; 4301 4302 if (param_len < sizeof(struct sctp_stream_reset_add_strm)) { 4303 break; 4304 } 4305 str_add = (struct sctp_stream_reset_add_strm *)ph; 4306 num_req++; 4307 sctp_handle_str_reset_add_strm(stcb, chk, str_add); 4308 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) { 4309 struct sctp_stream_reset_add_strm *str_add; 4310 4311 if (param_len < sizeof(struct sctp_stream_reset_add_strm)) { 4312 break; 4313 } 4314 str_add = (struct sctp_stream_reset_add_strm *)ph; 4315 num_req++; 4316 sctp_handle_str_reset_add_out_strm(stcb, chk, str_add); 4317 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) { 4318 struct sctp_stream_reset_in_request *req_in; 4319 4320 num_req++; 4321 req_in = (struct sctp_stream_reset_in_request *)ph; 4322 sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc); 4323 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) { 4324 struct sctp_stream_reset_tsn_request *req_tsn; 4325 4326 num_req++; 4327 req_tsn = (struct sctp_stream_reset_tsn_request *)ph; 4328 if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) { 4329 ret_code = 1; 4330 goto strres_nochunk; 4331 } 4332 /* no more */ 4333 break; 4334 } else if (ptype == SCTP_STR_RESET_RESPONSE) { 4335 struct sctp_stream_reset_response *resp; 4336 uint32_t result; 4337 4338 if (param_len < sizeof(struct sctp_stream_reset_response)) { 4339 break; 4340 } 4341 resp = (struct sctp_stream_reset_response *)ph; 4342 seq = ntohl(resp->response_seq); 4343 result = ntohl(resp->result); 4344 if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) { 4345 ret_code = 1; 4346 goto strres_nochunk; 4347 } 4348 } else { 4349 break; 4350 } 4351 offset += SCTP_SIZE32(param_len); 4352 if (remaining_length >= SCTP_SIZE32(param_len)) { 4353 remaining_length -= SCTP_SIZE32(param_len); 4354 } else { 4355 remaining_length = 0; 4356 } 4357 } 4358 if (num_req == 0) { 4359 /* we have no response free the stuff */ 4360 goto strres_nochunk; 4361 } 4362 /* ok we have a chunk to link in */ 4363 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, 4364 chk, 4365 sctp_next); 4366 stcb->asoc.ctrl_queue_cnt++; 4367 return (ret_code); 4368 } 4369 4370 /* 4371 * Handle a router or endpoints report of a packet loss, there are two ways 4372 * to handle this, either we get the whole packet and must disect it 4373 * ourselves (possibly with truncation and or corruption) or it is a summary 4374 * from a middle box that did the disectting for us. 4375 */ 4376 static void 4377 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp, 4378 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 4379 { 4380 uint32_t bottle_bw, on_queue; 4381 uint16_t trunc_len; 4382 unsigned int chlen; 4383 unsigned int at; 4384 struct sctp_chunk_desc desc; 4385 struct sctp_chunkhdr *ch; 4386 4387 chlen = ntohs(cp->ch.chunk_length); 4388 chlen -= sizeof(struct sctp_pktdrop_chunk); 4389 /* XXX possible chlen underflow */ 4390 if (chlen == 0) { 4391 ch = NULL; 4392 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) 4393 SCTP_STAT_INCR(sctps_pdrpbwrpt); 4394 } else { 4395 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr)); 4396 chlen -= sizeof(struct sctphdr); 4397 /* XXX possible chlen underflow */ 4398 memset(&desc, 0, sizeof(desc)); 4399 } 4400 trunc_len = (uint16_t)ntohs(cp->trunc_len); 4401 if (trunc_len > limit) { 4402 trunc_len = limit; 4403 } 4404 4405 /* now the chunks themselves */ 4406 while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) { 4407 desc.chunk_type = ch->chunk_type; 4408 /* get amount we need to move */ 4409 at = ntohs(ch->chunk_length); 4410 if (at < sizeof(struct sctp_chunkhdr)) { 4411 /* corrupt chunk, maybe at the end? */ 4412 SCTP_STAT_INCR(sctps_pdrpcrupt); 4413 break; 4414 } 4415 if (trunc_len == 0) { 4416 /* we are supposed to have all of it */ 4417 if (at > chlen) { 4418 /* corrupt skip it */ 4419 SCTP_STAT_INCR(sctps_pdrpcrupt); 4420 break; 4421 } 4422 } else { 4423 /* is there enough of it left ? */ 4424 if (desc.chunk_type == SCTP_DATA) { 4425 if (chlen < (sizeof(struct sctp_data_chunk) + 4426 sizeof(desc.data_bytes))) { 4427 break; 4428 } 4429 } else { 4430 if (chlen < sizeof(struct sctp_chunkhdr)) { 4431 break; 4432 } 4433 } 4434 } 4435 if (desc.chunk_type == SCTP_DATA) { 4436 /* can we get out the tsn? */ 4437 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4438 SCTP_STAT_INCR(sctps_pdrpmbda); 4439 4440 if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) { 4441 /* yep */ 4442 struct sctp_data_chunk *dcp; 4443 uint8_t *ddp; 4444 unsigned int iii; 4445 4446 dcp = (struct sctp_data_chunk *)ch; 4447 ddp = (uint8_t *)(dcp + 1); 4448 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) { 4449 desc.data_bytes[iii] = ddp[iii]; 4450 } 4451 desc.tsn_ifany = dcp->dp.tsn; 4452 } else { 4453 /* nope we are done. */ 4454 SCTP_STAT_INCR(sctps_pdrpnedat); 4455 break; 4456 } 4457 } else { 4458 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4459 SCTP_STAT_INCR(sctps_pdrpmbct); 4460 } 4461 4462 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) { 4463 SCTP_STAT_INCR(sctps_pdrppdbrk); 4464 break; 4465 } 4466 if (SCTP_SIZE32(at) > chlen) { 4467 break; 4468 } 4469 chlen -= SCTP_SIZE32(at); 4470 if (chlen < sizeof(struct sctp_chunkhdr)) { 4471 /* done, none left */ 4472 break; 4473 } 4474 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at)); 4475 } 4476 /* Now update any rwnd --- possibly */ 4477 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) { 4478 /* From a peer, we get a rwnd report */ 4479 uint32_t a_rwnd; 4480 4481 SCTP_STAT_INCR(sctps_pdrpfehos); 4482 4483 bottle_bw = ntohl(cp->bottle_bw); 4484 on_queue = ntohl(cp->current_onq); 4485 if (bottle_bw && on_queue) { 4486 /* a rwnd report is in here */ 4487 if (bottle_bw > on_queue) 4488 a_rwnd = bottle_bw - on_queue; 4489 else 4490 a_rwnd = 0; 4491 4492 if (a_rwnd == 0) 4493 stcb->asoc.peers_rwnd = 0; 4494 else { 4495 if (a_rwnd > stcb->asoc.total_flight) { 4496 stcb->asoc.peers_rwnd = 4497 a_rwnd - stcb->asoc.total_flight; 4498 } else { 4499 stcb->asoc.peers_rwnd = 0; 4500 } 4501 if (stcb->asoc.peers_rwnd < 4502 stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 4503 /* SWS sender side engages */ 4504 stcb->asoc.peers_rwnd = 0; 4505 } 4506 } 4507 } 4508 } else { 4509 SCTP_STAT_INCR(sctps_pdrpfmbox); 4510 } 4511 4512 /* now middle boxes in sat networks get a cwnd bump */ 4513 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) && 4514 (stcb->asoc.sat_t3_loss_recovery == 0) && 4515 (stcb->asoc.sat_network)) { 4516 /* 4517 * This is debatable but for sat networks it makes sense 4518 * Note if a T3 timer has went off, we will prohibit any 4519 * changes to cwnd until we exit the t3 loss recovery. 4520 */ 4521 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb, 4522 net, cp, &bottle_bw, &on_queue); 4523 } 4524 } 4525 4526 /* 4527 * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to 4528 * still contain IP/SCTP header - stcb: is the tcb found for this packet - 4529 * offset: offset into the mbuf chain to first chunkhdr - length: is the 4530 * length of the complete packet outputs: - length: modified to remaining 4531 * length after control processing - netp: modified to new sctp_nets after 4532 * cookie-echo processing - return NULL to discard the packet (ie. no asoc, 4533 * bad packet,...) otherwise return the tcb for this packet 4534 */ 4535 #ifdef __GNUC__ 4536 __attribute__((noinline)) 4537 #endif 4538 static struct sctp_tcb * 4539 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length, 4540 struct sockaddr *src, struct sockaddr *dst, 4541 struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp, 4542 struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen, 4543 uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum, 4544 uint32_t vrf_id, uint16_t port) 4545 { 4546 struct sctp_association *asoc; 4547 struct mbuf *op_err; 4548 char msg[SCTP_DIAG_INFO_LEN]; 4549 uint32_t vtag_in; 4550 int num_chunks = 0; /* number of control chunks processed */ 4551 uint32_t chk_length, contiguous; 4552 int ret; 4553 int abort_no_unlock = 0; 4554 int ecne_seen = 0; 4555 4556 /* 4557 * How big should this be, and should it be alloc'd? Lets try the 4558 * d-mtu-ceiling for now (2k) and that should hopefully work ... 4559 * until we get into jumbo grams and such.. 4560 */ 4561 uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE]; 4562 int got_auth = 0; 4563 uint32_t auth_offset = 0, auth_len = 0; 4564 int auth_skipped = 0; 4565 int asconf_cnt = 0; 4566 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4567 struct socket *so; 4568 #endif 4569 4570 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n", 4571 iphlen, *offset, length, (void *)stcb); 4572 4573 if (stcb) { 4574 SCTP_TCB_LOCK_ASSERT(stcb); 4575 } 4576 /* validate chunk header length... */ 4577 if (ntohs(ch->chunk_length) < sizeof(*ch)) { 4578 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n", 4579 ntohs(ch->chunk_length)); 4580 *offset = length; 4581 return (stcb); 4582 } 4583 /* 4584 * validate the verification tag 4585 */ 4586 vtag_in = ntohl(sh->v_tag); 4587 4588 if (ch->chunk_type == SCTP_INITIATION) { 4589 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n", 4590 ntohs(ch->chunk_length), vtag_in); 4591 if (vtag_in != 0) { 4592 /* protocol error- silently discard... */ 4593 SCTP_STAT_INCR(sctps_badvtag); 4594 if (stcb != NULL) { 4595 SCTP_TCB_UNLOCK(stcb); 4596 } 4597 return (NULL); 4598 } 4599 } else if (ch->chunk_type != SCTP_COOKIE_ECHO) { 4600 /* 4601 * If there is no stcb, skip the AUTH chunk and process 4602 * later after a stcb is found (to validate the lookup was 4603 * valid. 4604 */ 4605 if ((ch->chunk_type == SCTP_AUTHENTICATION) && 4606 (stcb == NULL) && 4607 (inp->auth_supported == 1)) { 4608 /* save this chunk for later processing */ 4609 auth_skipped = 1; 4610 auth_offset = *offset; 4611 auth_len = ntohs(ch->chunk_length); 4612 4613 /* (temporarily) move past this chunk */ 4614 *offset += SCTP_SIZE32(auth_len); 4615 if (*offset >= length) { 4616 /* no more data left in the mbuf chain */ 4617 *offset = length; 4618 return (NULL); 4619 } 4620 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4621 sizeof(struct sctp_chunkhdr), chunk_buf); 4622 } 4623 if (ch == NULL) { 4624 /* Help */ 4625 *offset = length; 4626 return (stcb); 4627 } 4628 if (ch->chunk_type == SCTP_COOKIE_ECHO) { 4629 goto process_control_chunks; 4630 } 4631 /* 4632 * first check if it's an ASCONF with an unknown src addr we 4633 * need to look inside to find the association 4634 */ 4635 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) { 4636 struct sctp_chunkhdr *asconf_ch = ch; 4637 uint32_t asconf_offset = 0, asconf_len = 0; 4638 4639 /* inp's refcount may be reduced */ 4640 SCTP_INP_INCR_REF(inp); 4641 4642 asconf_offset = *offset; 4643 do { 4644 asconf_len = ntohs(asconf_ch->chunk_length); 4645 if (asconf_len < sizeof(struct sctp_asconf_paramhdr)) 4646 break; 4647 stcb = sctp_findassociation_ep_asconf(m, 4648 *offset, 4649 dst, 4650 sh, &inp, netp, vrf_id); 4651 if (stcb != NULL) 4652 break; 4653 asconf_offset += SCTP_SIZE32(asconf_len); 4654 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset, 4655 sizeof(struct sctp_chunkhdr), chunk_buf); 4656 } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF); 4657 if (stcb == NULL) { 4658 /* 4659 * reduce inp's refcount if not reduced in 4660 * sctp_findassociation_ep_asconf(). 4661 */ 4662 SCTP_INP_DECR_REF(inp); 4663 } 4664 4665 /* now go back and verify any auth chunk to be sure */ 4666 if (auth_skipped && (stcb != NULL)) { 4667 struct sctp_auth_chunk *auth; 4668 4669 auth = (struct sctp_auth_chunk *) 4670 sctp_m_getptr(m, auth_offset, 4671 auth_len, chunk_buf); 4672 got_auth = 1; 4673 auth_skipped = 0; 4674 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, 4675 auth_offset)) { 4676 /* auth HMAC failed so dump it */ 4677 *offset = length; 4678 return (stcb); 4679 } else { 4680 /* remaining chunks are HMAC checked */ 4681 stcb->asoc.authenticated = 1; 4682 } 4683 } 4684 } 4685 if (stcb == NULL) { 4686 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 4687 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4688 msg); 4689 /* no association, so it's out of the blue... */ 4690 sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, op_err, 4691 mflowtype, mflowid, inp->fibnum, 4692 vrf_id, port); 4693 *offset = length; 4694 return (NULL); 4695 } 4696 asoc = &stcb->asoc; 4697 /* ABORT and SHUTDOWN can use either v_tag... */ 4698 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) || 4699 (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) || 4700 (ch->chunk_type == SCTP_PACKET_DROPPED)) { 4701 /* Take the T-bit always into account. */ 4702 if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) && 4703 (vtag_in == asoc->my_vtag)) || 4704 (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) && 4705 (asoc->peer_vtag != htonl(0)) && 4706 (vtag_in == asoc->peer_vtag))) { 4707 /* this is valid */ 4708 } else { 4709 /* drop this packet... */ 4710 SCTP_STAT_INCR(sctps_badvtag); 4711 if (stcb != NULL) { 4712 SCTP_TCB_UNLOCK(stcb); 4713 } 4714 return (NULL); 4715 } 4716 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 4717 if (vtag_in != asoc->my_vtag) { 4718 /* 4719 * this could be a stale SHUTDOWN-ACK or the 4720 * peer never got the SHUTDOWN-COMPLETE and 4721 * is still hung; we have started a new asoc 4722 * but it won't complete until the shutdown 4723 * is completed 4724 */ 4725 if (stcb != NULL) { 4726 SCTP_TCB_UNLOCK(stcb); 4727 } 4728 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 4729 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4730 msg); 4731 sctp_handle_ootb(m, iphlen, *offset, src, dst, 4732 sh, inp, op_err, 4733 mflowtype, mflowid, fibnum, 4734 vrf_id, port); 4735 return (NULL); 4736 } 4737 } else { 4738 /* for all other chunks, vtag must match */ 4739 if (vtag_in != asoc->my_vtag) { 4740 /* invalid vtag... */ 4741 SCTPDBG(SCTP_DEBUG_INPUT3, 4742 "invalid vtag: %xh, expect %xh\n", 4743 vtag_in, asoc->my_vtag); 4744 SCTP_STAT_INCR(sctps_badvtag); 4745 if (stcb != NULL) { 4746 SCTP_TCB_UNLOCK(stcb); 4747 } 4748 *offset = length; 4749 return (NULL); 4750 } 4751 } 4752 } /* end if !SCTP_COOKIE_ECHO */ 4753 /* 4754 * process all control chunks... 4755 */ 4756 if (((ch->chunk_type == SCTP_SELECTIVE_ACK) || 4757 (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) || 4758 (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) && 4759 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 4760 /* implied cookie-ack.. we must have lost the ack */ 4761 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, 4762 *netp); 4763 } 4764 4765 process_control_chunks: 4766 while (IS_SCTP_CONTROL(ch)) { 4767 /* validate chunk length */ 4768 chk_length = ntohs(ch->chunk_length); 4769 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n", 4770 ch->chunk_type, chk_length); 4771 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length); 4772 if (chk_length < sizeof(*ch) || 4773 (*offset + (int)chk_length) > length) { 4774 *offset = length; 4775 return (stcb); 4776 } 4777 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks); 4778 /* 4779 * INIT and INIT-ACK only gets the init ack "header" portion 4780 * only because we don't have to process the peer's COOKIE. 4781 * All others get a complete chunk. 4782 */ 4783 switch (ch->chunk_type) { 4784 case SCTP_INITIATION: 4785 contiguous = sizeof(struct sctp_init_chunk); 4786 break; 4787 case SCTP_INITIATION_ACK: 4788 contiguous = sizeof(struct sctp_init_ack_chunk); 4789 break; 4790 default: 4791 contiguous = min(chk_length, sizeof(chunk_buf)); 4792 break; 4793 } 4794 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4795 contiguous, 4796 chunk_buf); 4797 if (ch == NULL) { 4798 *offset = length; 4799 if (stcb != NULL) { 4800 SCTP_TCB_UNLOCK(stcb); 4801 } 4802 return (NULL); 4803 } 4804 4805 num_chunks++; 4806 /* Save off the last place we got a control from */ 4807 if (stcb != NULL) { 4808 if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) { 4809 /* 4810 * allow last_control to be NULL if 4811 * ASCONF... ASCONF processing will find the 4812 * right net later 4813 */ 4814 if ((netp != NULL) && (*netp != NULL)) 4815 stcb->asoc.last_control_chunk_from = *netp; 4816 } 4817 } 4818 #ifdef SCTP_AUDITING_ENABLED 4819 sctp_audit_log(0xB0, ch->chunk_type); 4820 #endif 4821 4822 /* check to see if this chunk required auth, but isn't */ 4823 if ((stcb != NULL) && 4824 sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) && 4825 !stcb->asoc.authenticated) { 4826 /* "silently" ignore */ 4827 SCTP_STAT_INCR(sctps_recvauthmissing); 4828 goto next_chunk; 4829 } 4830 switch (ch->chunk_type) { 4831 case SCTP_INITIATION: 4832 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n"); 4833 /* The INIT chunk must be the only chunk. */ 4834 if ((num_chunks > 1) || 4835 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4836 /* RFC 4960 requires that no ABORT is sent */ 4837 *offset = length; 4838 if (stcb != NULL) { 4839 SCTP_TCB_UNLOCK(stcb); 4840 } 4841 return (NULL); 4842 } 4843 /* Honor our resource limit. */ 4844 if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) { 4845 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 4846 sctp_abort_association(inp, stcb, m, iphlen, 4847 src, dst, sh, op_err, 4848 mflowtype, mflowid, 4849 vrf_id, port); 4850 *offset = length; 4851 return (NULL); 4852 } 4853 sctp_handle_init(m, iphlen, *offset, src, dst, sh, 4854 (struct sctp_init_chunk *)ch, inp, 4855 stcb, *netp, &abort_no_unlock, 4856 mflowtype, mflowid, 4857 vrf_id, port); 4858 *offset = length; 4859 if ((!abort_no_unlock) && (stcb != NULL)) { 4860 SCTP_TCB_UNLOCK(stcb); 4861 } 4862 return (NULL); 4863 break; 4864 case SCTP_PAD_CHUNK: 4865 break; 4866 case SCTP_INITIATION_ACK: 4867 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT_ACK\n"); 4868 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4869 /* We are not interested anymore */ 4870 if ((stcb != NULL) && (stcb->asoc.total_output_queue_size)) { 4871 ; 4872 } else { 4873 *offset = length; 4874 if (stcb != NULL) { 4875 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4876 so = SCTP_INP_SO(inp); 4877 atomic_add_int(&stcb->asoc.refcnt, 1); 4878 SCTP_TCB_UNLOCK(stcb); 4879 SCTP_SOCKET_LOCK(so, 1); 4880 SCTP_TCB_LOCK(stcb); 4881 atomic_subtract_int(&stcb->asoc.refcnt, 1); 4882 #endif 4883 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 4884 SCTP_FROM_SCTP_INPUT + SCTP_LOC_29); 4885 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4886 SCTP_SOCKET_UNLOCK(so, 1); 4887 #endif 4888 } 4889 return (NULL); 4890 } 4891 } 4892 /* The INIT-ACK chunk must be the only chunk. */ 4893 if ((num_chunks > 1) || 4894 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4895 *offset = length; 4896 return (stcb); 4897 } 4898 if ((netp != NULL) && (*netp != NULL)) { 4899 ret = sctp_handle_init_ack(m, iphlen, *offset, 4900 src, dst, sh, 4901 (struct sctp_init_ack_chunk *)ch, 4902 stcb, *netp, 4903 &abort_no_unlock, 4904 mflowtype, mflowid, 4905 vrf_id); 4906 } else { 4907 ret = -1; 4908 } 4909 *offset = length; 4910 if (abort_no_unlock) { 4911 return (NULL); 4912 } 4913 /* 4914 * Special case, I must call the output routine to 4915 * get the cookie echoed 4916 */ 4917 if ((stcb != NULL) && (ret == 0)) { 4918 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 4919 } 4920 return (stcb); 4921 break; 4922 case SCTP_SELECTIVE_ACK: 4923 case SCTP_NR_SELECTIVE_ACK: 4924 { 4925 int abort_now = 0; 4926 uint32_t a_rwnd, cum_ack; 4927 uint16_t num_seg, num_nr_seg, num_dup; 4928 uint8_t flags; 4929 int offset_seg, offset_dup; 4930 4931 SCTPDBG(SCTP_DEBUG_INPUT3, "%s\n", 4932 ch->chunk_type == SCTP_SELECTIVE_ACK ? "SCTP_SACK" : "SCTP_NR_SACK"); 4933 SCTP_STAT_INCR(sctps_recvsacks); 4934 if (stcb == NULL) { 4935 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing %s chunk\n", 4936 (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK"); 4937 break; 4938 } 4939 if (ch->chunk_type == SCTP_SELECTIVE_ACK) { 4940 if (chk_length < sizeof(struct sctp_sack_chunk)) { 4941 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n"); 4942 break; 4943 } 4944 } else { 4945 if (stcb->asoc.nrsack_supported == 0) { 4946 goto unknown_chunk; 4947 } 4948 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) { 4949 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR_SACK chunk, too small\n"); 4950 break; 4951 } 4952 } 4953 if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4954 /*- 4955 * If we have sent a shutdown-ack, we will pay no 4956 * attention to a sack sent in to us since 4957 * we don't care anymore. 4958 */ 4959 break; 4960 } 4961 flags = ch->chunk_flags; 4962 if (ch->chunk_type == SCTP_SELECTIVE_ACK) { 4963 struct sctp_sack_chunk *sack; 4964 4965 sack = (struct sctp_sack_chunk *)ch; 4966 cum_ack = ntohl(sack->sack.cum_tsn_ack); 4967 num_seg = ntohs(sack->sack.num_gap_ack_blks); 4968 num_nr_seg = 0; 4969 num_dup = ntohs(sack->sack.num_dup_tsns); 4970 a_rwnd = ntohl(sack->sack.a_rwnd); 4971 if (sizeof(struct sctp_sack_chunk) + 4972 num_seg * sizeof(struct sctp_gap_ack_block) + 4973 num_dup * sizeof(uint32_t) != chk_length) { 4974 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n"); 4975 break; 4976 } 4977 offset_seg = *offset + sizeof(struct sctp_sack_chunk); 4978 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 4979 } else { 4980 struct sctp_nr_sack_chunk *nr_sack; 4981 4982 nr_sack = (struct sctp_nr_sack_chunk *)ch; 4983 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack); 4984 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks); 4985 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks); 4986 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns); 4987 a_rwnd = ntohl(nr_sack->nr_sack.a_rwnd); 4988 if (sizeof(struct sctp_nr_sack_chunk) + 4989 (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) + 4990 num_dup * sizeof(uint32_t) != chk_length) { 4991 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n"); 4992 break; 4993 } 4994 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk); 4995 offset_dup = offset_seg + (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block); 4996 } 4997 SCTPDBG(SCTP_DEBUG_INPUT3, "%s process cum_ack:%x num_seg:%d a_rwnd:%d\n", 4998 (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK", 4999 cum_ack, num_seg, a_rwnd); 5000 stcb->asoc.seen_a_sack_this_pkt = 1; 5001 if ((stcb->asoc.pr_sctp_cnt == 0) && 5002 (num_seg == 0) && (num_nr_seg == 0) && 5003 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 5004 (stcb->asoc.saw_sack_with_frags == 0) && 5005 (stcb->asoc.saw_sack_with_nr_frags == 0) && 5006 (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) { 5007 /* 5008 * We have a SIMPLE sack having no 5009 * prior segments and data on sent 5010 * queue to be acked. Use the faster 5011 * path sack processing. We also 5012 * allow window update sacks with no 5013 * missing segments to go this way 5014 * too. 5015 */ 5016 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, 5017 &abort_now, ecne_seen); 5018 } else { 5019 if ((netp != NULL) && (*netp != NULL)) { 5020 sctp_handle_sack(m, offset_seg, offset_dup, stcb, 5021 num_seg, num_nr_seg, num_dup, &abort_now, flags, 5022 cum_ack, a_rwnd, ecne_seen); 5023 } 5024 } 5025 if (abort_now) { 5026 /* ABORT signal from sack processing */ 5027 *offset = length; 5028 return (NULL); 5029 } 5030 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 5031 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 5032 (stcb->asoc.stream_queue_cnt == 0)) { 5033 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 5034 } 5035 break; 5036 } 5037 case SCTP_HEARTBEAT_REQUEST: 5038 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n"); 5039 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 5040 SCTP_STAT_INCR(sctps_recvheartbeat); 5041 sctp_send_heartbeat_ack(stcb, m, *offset, 5042 chk_length, *netp); 5043 } 5044 break; 5045 case SCTP_HEARTBEAT_ACK: 5046 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT_ACK\n"); 5047 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) { 5048 /* Its not ours */ 5049 *offset = length; 5050 return (stcb); 5051 } 5052 SCTP_STAT_INCR(sctps_recvheartbeatack); 5053 if ((netp != NULL) && (*netp != NULL)) { 5054 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch, 5055 stcb, *netp); 5056 } 5057 break; 5058 case SCTP_ABORT_ASSOCIATION: 5059 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n", 5060 (void *)stcb); 5061 *offset = length; 5062 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 5063 if (sctp_handle_abort((struct sctp_abort_chunk *)ch, stcb, *netp)) { 5064 return (NULL); 5065 } else { 5066 return (stcb); 5067 } 5068 } else { 5069 return (NULL); 5070 } 5071 break; 5072 case SCTP_SHUTDOWN: 5073 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n", 5074 (void *)stcb); 5075 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) { 5076 *offset = length; 5077 return (stcb); 5078 } 5079 if ((netp != NULL) && (*netp != NULL)) { 5080 int abort_flag = 0; 5081 5082 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch, 5083 stcb, *netp, &abort_flag); 5084 if (abort_flag) { 5085 *offset = length; 5086 return (NULL); 5087 } 5088 } 5089 break; 5090 case SCTP_SHUTDOWN_ACK: 5091 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_ACK, stcb %p\n", (void *)stcb); 5092 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 5093 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp); 5094 } 5095 *offset = length; 5096 return (NULL); 5097 break; 5098 case SCTP_OPERATION_ERROR: 5099 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP_ERR\n"); 5100 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL) && 5101 sctp_handle_error(ch, stcb, *netp, contiguous) < 0) { 5102 *offset = length; 5103 return (NULL); 5104 } 5105 break; 5106 case SCTP_COOKIE_ECHO: 5107 SCTPDBG(SCTP_DEBUG_INPUT3, 5108 "SCTP_COOKIE_ECHO, stcb %p\n", (void *)stcb); 5109 if ((stcb != NULL) && (stcb->asoc.total_output_queue_size > 0)) { 5110 ; 5111 } else { 5112 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5113 /* We are not interested anymore */ 5114 abend: 5115 if (stcb != NULL) { 5116 SCTP_TCB_UNLOCK(stcb); 5117 } 5118 *offset = length; 5119 return (NULL); 5120 } 5121 } 5122 /*- 5123 * First are we accepting? We do this again here 5124 * since it is possible that a previous endpoint WAS 5125 * listening responded to a INIT-ACK and then 5126 * closed. We opened and bound.. and are now no 5127 * longer listening. 5128 * 5129 * XXXGL: notes on checking listen queue length. 5130 * 1) SCTP_IS_LISTENING() doesn't necessarily mean 5131 * SOLISTENING(), because a listening "UDP type" 5132 * socket isn't listening in terms of the socket 5133 * layer. It is a normal data flow socket, that 5134 * can fork off new connections. Thus, we should 5135 * look into sol_qlen only in case we are !UDP. 5136 * 2) Checking sol_qlen in general requires locking 5137 * the socket, and this code lacks that. 5138 */ 5139 if ((stcb == NULL) && 5140 (!SCTP_IS_LISTENING(inp) || 5141 (!(inp->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE) && 5142 inp->sctp_socket->sol_qlen >= inp->sctp_socket->sol_qlimit))) { 5143 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 5144 (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) { 5145 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 5146 sctp_abort_association(inp, stcb, m, iphlen, 5147 src, dst, sh, op_err, 5148 mflowtype, mflowid, 5149 vrf_id, port); 5150 } 5151 *offset = length; 5152 return (NULL); 5153 } else { 5154 struct mbuf *ret_buf; 5155 struct sctp_inpcb *linp; 5156 5157 if (stcb) { 5158 linp = NULL; 5159 } else { 5160 linp = inp; 5161 } 5162 5163 if (linp != NULL) { 5164 SCTP_ASOC_CREATE_LOCK(linp); 5165 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 5166 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) { 5167 SCTP_ASOC_CREATE_UNLOCK(linp); 5168 goto abend; 5169 } 5170 } 5171 5172 if (netp != NULL) { 5173 struct sctp_tcb *locked_stcb; 5174 5175 locked_stcb = stcb; 5176 ret_buf = 5177 sctp_handle_cookie_echo(m, iphlen, 5178 *offset, 5179 src, dst, 5180 sh, 5181 (struct sctp_cookie_echo_chunk *)ch, 5182 &inp, &stcb, netp, 5183 auth_skipped, 5184 auth_offset, 5185 auth_len, 5186 &locked_stcb, 5187 mflowtype, 5188 mflowid, 5189 vrf_id, 5190 port); 5191 if ((locked_stcb != NULL) && (locked_stcb != stcb)) { 5192 SCTP_TCB_UNLOCK(locked_stcb); 5193 } 5194 if (stcb != NULL) { 5195 SCTP_TCB_LOCK_ASSERT(stcb); 5196 } 5197 } else { 5198 ret_buf = NULL; 5199 } 5200 if (linp != NULL) { 5201 SCTP_ASOC_CREATE_UNLOCK(linp); 5202 } 5203 if (ret_buf == NULL) { 5204 if (stcb != NULL) { 5205 SCTP_TCB_UNLOCK(stcb); 5206 } 5207 SCTPDBG(SCTP_DEBUG_INPUT3, 5208 "GAK, null buffer\n"); 5209 *offset = length; 5210 return (NULL); 5211 } 5212 /* if AUTH skipped, see if it verified... */ 5213 if (auth_skipped) { 5214 got_auth = 1; 5215 auth_skipped = 0; 5216 } 5217 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) { 5218 /* 5219 * Restart the timer if we have 5220 * pending data 5221 */ 5222 struct sctp_tmit_chunk *chk; 5223 5224 chk = TAILQ_FIRST(&stcb->asoc.sent_queue); 5225 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 5226 } 5227 } 5228 break; 5229 case SCTP_COOKIE_ACK: 5230 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE_ACK, stcb %p\n", (void *)stcb); 5231 if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) { 5232 return (stcb); 5233 } 5234 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5235 /* We are not interested anymore */ 5236 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 5237 ; 5238 } else if (stcb) { 5239 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5240 so = SCTP_INP_SO(inp); 5241 atomic_add_int(&stcb->asoc.refcnt, 1); 5242 SCTP_TCB_UNLOCK(stcb); 5243 SCTP_SOCKET_LOCK(so, 1); 5244 SCTP_TCB_LOCK(stcb); 5245 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5246 #endif 5247 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 5248 SCTP_FROM_SCTP_INPUT + SCTP_LOC_30); 5249 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5250 SCTP_SOCKET_UNLOCK(so, 1); 5251 #endif 5252 *offset = length; 5253 return (NULL); 5254 } 5255 } 5256 if ((netp != NULL) && (*netp != NULL)) { 5257 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp); 5258 } 5259 break; 5260 case SCTP_ECN_ECHO: 5261 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_ECHO\n"); 5262 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) { 5263 /* Its not ours */ 5264 *offset = length; 5265 return (stcb); 5266 } 5267 if (stcb->asoc.ecn_supported == 0) { 5268 goto unknown_chunk; 5269 } 5270 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, stcb); 5271 ecne_seen = 1; 5272 break; 5273 case SCTP_ECN_CWR: 5274 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_CWR\n"); 5275 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) { 5276 *offset = length; 5277 return (stcb); 5278 } 5279 if (stcb->asoc.ecn_supported == 0) { 5280 goto unknown_chunk; 5281 } 5282 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp); 5283 break; 5284 case SCTP_SHUTDOWN_COMPLETE: 5285 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_COMPLETE, stcb %p\n", (void *)stcb); 5286 /* must be first and only chunk */ 5287 if ((num_chunks > 1) || 5288 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 5289 *offset = length; 5290 return (stcb); 5291 } 5292 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 5293 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch, 5294 stcb, *netp); 5295 } 5296 *offset = length; 5297 return (NULL); 5298 break; 5299 case SCTP_ASCONF: 5300 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n"); 5301 if (stcb != NULL) { 5302 if (stcb->asoc.asconf_supported == 0) { 5303 goto unknown_chunk; 5304 } 5305 sctp_handle_asconf(m, *offset, src, 5306 (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0); 5307 asconf_cnt++; 5308 } 5309 break; 5310 case SCTP_ASCONF_ACK: 5311 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF_ACK\n"); 5312 if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) { 5313 /* Its not ours */ 5314 *offset = length; 5315 return (stcb); 5316 } 5317 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 5318 if (stcb->asoc.asconf_supported == 0) { 5319 goto unknown_chunk; 5320 } 5321 /* He's alive so give him credit */ 5322 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5323 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5324 stcb->asoc.overall_error_count, 5325 0, 5326 SCTP_FROM_SCTP_INPUT, 5327 __LINE__); 5328 } 5329 stcb->asoc.overall_error_count = 0; 5330 sctp_handle_asconf_ack(m, *offset, 5331 (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock); 5332 if (abort_no_unlock) 5333 return (NULL); 5334 } 5335 break; 5336 case SCTP_FORWARD_CUM_TSN: 5337 case SCTP_IFORWARD_CUM_TSN: 5338 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD_TSN\n"); 5339 if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) { 5340 /* Its not ours */ 5341 *offset = length; 5342 return (stcb); 5343 } 5344 5345 if (stcb != NULL) { 5346 int abort_flag = 0; 5347 5348 if (stcb->asoc.prsctp_supported == 0) { 5349 goto unknown_chunk; 5350 } 5351 *fwd_tsn_seen = 1; 5352 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5353 /* We are not interested anymore */ 5354 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5355 so = SCTP_INP_SO(inp); 5356 atomic_add_int(&stcb->asoc.refcnt, 1); 5357 SCTP_TCB_UNLOCK(stcb); 5358 SCTP_SOCKET_LOCK(so, 1); 5359 SCTP_TCB_LOCK(stcb); 5360 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5361 #endif 5362 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 5363 SCTP_FROM_SCTP_INPUT + SCTP_LOC_31); 5364 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5365 SCTP_SOCKET_UNLOCK(so, 1); 5366 #endif 5367 *offset = length; 5368 return (NULL); 5369 } 5370 /* 5371 * For sending a SACK this looks like DATA 5372 * chunks. 5373 */ 5374 stcb->asoc.last_data_chunk_from = stcb->asoc.last_control_chunk_from; 5375 sctp_handle_forward_tsn(stcb, 5376 (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset); 5377 if (abort_flag) { 5378 *offset = length; 5379 return (NULL); 5380 } 5381 } 5382 break; 5383 case SCTP_STREAM_RESET: 5384 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n"); 5385 if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) { 5386 /* Its not ours */ 5387 *offset = length; 5388 return (stcb); 5389 } 5390 if (stcb->asoc.reconfig_supported == 0) { 5391 goto unknown_chunk; 5392 } 5393 if (sctp_handle_stream_reset(stcb, m, *offset, ch)) { 5394 /* stop processing */ 5395 *offset = length; 5396 return (NULL); 5397 } 5398 break; 5399 case SCTP_PACKET_DROPPED: 5400 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n"); 5401 /* re-get it all please */ 5402 if (chk_length < sizeof(struct sctp_pktdrop_chunk)) { 5403 /* Its not ours */ 5404 *offset = length; 5405 return (stcb); 5406 } 5407 5408 if ((ch != NULL) && (stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 5409 if (stcb->asoc.pktdrop_supported == 0) { 5410 goto unknown_chunk; 5411 } 5412 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch, 5413 stcb, *netp, 5414 min(chk_length, contiguous)); 5415 } 5416 break; 5417 case SCTP_AUTHENTICATION: 5418 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n"); 5419 if (stcb == NULL) { 5420 /* save the first AUTH for later processing */ 5421 if (auth_skipped == 0) { 5422 auth_offset = *offset; 5423 auth_len = chk_length; 5424 auth_skipped = 1; 5425 } 5426 /* skip this chunk (temporarily) */ 5427 goto next_chunk; 5428 } 5429 if (stcb->asoc.auth_supported == 0) { 5430 goto unknown_chunk; 5431 } 5432 if ((chk_length < (sizeof(struct sctp_auth_chunk))) || 5433 (chk_length > (sizeof(struct sctp_auth_chunk) + 5434 SCTP_AUTH_DIGEST_LEN_MAX))) { 5435 /* Its not ours */ 5436 *offset = length; 5437 return (stcb); 5438 } 5439 if (got_auth == 1) { 5440 /* skip this chunk... it's already auth'd */ 5441 goto next_chunk; 5442 } 5443 got_auth = 1; 5444 if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch, 5445 m, *offset)) { 5446 /* auth HMAC failed so dump the packet */ 5447 *offset = length; 5448 return (stcb); 5449 } else { 5450 /* remaining chunks are HMAC checked */ 5451 stcb->asoc.authenticated = 1; 5452 } 5453 break; 5454 5455 default: 5456 unknown_chunk: 5457 /* it's an unknown chunk! */ 5458 if ((ch->chunk_type & 0x40) && (stcb != NULL)) { 5459 struct sctp_gen_error_cause *cause; 5460 int len; 5461 5462 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_gen_error_cause), 5463 0, M_NOWAIT, 1, MT_DATA); 5464 if (op_err != NULL) { 5465 len = min(SCTP_SIZE32(chk_length), (uint32_t)(length - *offset)); 5466 cause = mtod(op_err, struct sctp_gen_error_cause *); 5467 cause->code = htons(SCTP_CAUSE_UNRECOG_CHUNK); 5468 cause->length = htons((uint16_t)(len + sizeof(struct sctp_gen_error_cause))); 5469 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_gen_error_cause); 5470 SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(m, *offset, len, M_NOWAIT); 5471 if (SCTP_BUF_NEXT(op_err) != NULL) { 5472 #ifdef SCTP_MBUF_LOGGING 5473 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5474 sctp_log_mbc(SCTP_BUF_NEXT(op_err), SCTP_MBUF_ICOPY); 5475 } 5476 #endif 5477 sctp_queue_op_err(stcb, op_err); 5478 } else { 5479 sctp_m_freem(op_err); 5480 } 5481 } 5482 } 5483 if ((ch->chunk_type & 0x80) == 0) { 5484 /* discard this packet */ 5485 *offset = length; 5486 return (stcb); 5487 } /* else skip this bad chunk and continue... */ 5488 break; 5489 } /* switch (ch->chunk_type) */ 5490 5491 5492 next_chunk: 5493 /* get the next chunk */ 5494 *offset += SCTP_SIZE32(chk_length); 5495 if (*offset >= length) { 5496 /* no more data left in the mbuf chain */ 5497 break; 5498 } 5499 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 5500 sizeof(struct sctp_chunkhdr), chunk_buf); 5501 if (ch == NULL) { 5502 *offset = length; 5503 return (stcb); 5504 } 5505 } /* while */ 5506 5507 if ((asconf_cnt > 0) && (stcb != NULL)) { 5508 sctp_send_asconf_ack(stcb); 5509 } 5510 return (stcb); 5511 } 5512 5513 5514 /* 5515 * common input chunk processing (v4 and v6) 5516 */ 5517 void 5518 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length, 5519 struct sockaddr *src, struct sockaddr *dst, 5520 struct sctphdr *sh, struct sctp_chunkhdr *ch, 5521 uint8_t compute_crc, 5522 uint8_t ecn_bits, 5523 uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum, 5524 uint32_t vrf_id, uint16_t port) 5525 { 5526 uint32_t high_tsn; 5527 int fwd_tsn_seen = 0, data_processed = 0; 5528 struct mbuf *m = *mm, *op_err; 5529 char msg[SCTP_DIAG_INFO_LEN]; 5530 int un_sent; 5531 int cnt_ctrl_ready = 0; 5532 struct sctp_inpcb *inp = NULL, *inp_decr = NULL; 5533 struct sctp_tcb *stcb = NULL; 5534 struct sctp_nets *net = NULL; 5535 5536 SCTP_STAT_INCR(sctps_recvdatagrams); 5537 #ifdef SCTP_AUDITING_ENABLED 5538 sctp_audit_log(0xE0, 1); 5539 sctp_auditing(0, inp, stcb, net); 5540 #endif 5541 if (compute_crc != 0) { 5542 uint32_t check, calc_check; 5543 5544 check = sh->checksum; 5545 sh->checksum = 0; 5546 calc_check = sctp_calculate_cksum(m, iphlen); 5547 sh->checksum = check; 5548 if (calc_check != check) { 5549 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x m:%p mlen:%d iphlen:%d\n", 5550 calc_check, check, (void *)m, length, iphlen); 5551 stcb = sctp_findassociation_addr(m, offset, src, dst, 5552 sh, ch, &inp, &net, vrf_id); 5553 #if defined(INET) || defined(INET6) 5554 if ((ch->chunk_type != SCTP_INITIATION) && 5555 (net != NULL) && (net->port != port)) { 5556 if (net->port == 0) { 5557 /* UDP encapsulation turned on. */ 5558 net->mtu -= sizeof(struct udphdr); 5559 if (stcb->asoc.smallest_mtu > net->mtu) { 5560 sctp_pathmtu_adjustment(stcb, net->mtu); 5561 } 5562 } else if (port == 0) { 5563 /* UDP encapsulation turned off. */ 5564 net->mtu += sizeof(struct udphdr); 5565 /* XXX Update smallest_mtu */ 5566 } 5567 net->port = port; 5568 } 5569 #endif 5570 if (net != NULL) { 5571 net->flowtype = mflowtype; 5572 net->flowid = mflowid; 5573 } 5574 if ((inp != NULL) && (stcb != NULL)) { 5575 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1); 5576 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED); 5577 } else if ((inp != NULL) && (stcb == NULL)) { 5578 inp_decr = inp; 5579 } 5580 SCTP_STAT_INCR(sctps_badsum); 5581 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors); 5582 goto out; 5583 } 5584 } 5585 /* Destination port of 0 is illegal, based on RFC4960. */ 5586 if (sh->dest_port == 0) { 5587 SCTP_STAT_INCR(sctps_hdrops); 5588 goto out; 5589 } 5590 stcb = sctp_findassociation_addr(m, offset, src, dst, 5591 sh, ch, &inp, &net, vrf_id); 5592 #if defined(INET) || defined(INET6) 5593 if ((ch->chunk_type != SCTP_INITIATION) && 5594 (net != NULL) && (net->port != port)) { 5595 if (net->port == 0) { 5596 /* UDP encapsulation turned on. */ 5597 net->mtu -= sizeof(struct udphdr); 5598 if (stcb->asoc.smallest_mtu > net->mtu) { 5599 sctp_pathmtu_adjustment(stcb, net->mtu); 5600 } 5601 } else if (port == 0) { 5602 /* UDP encapsulation turned off. */ 5603 net->mtu += sizeof(struct udphdr); 5604 /* XXX Update smallest_mtu */ 5605 } 5606 net->port = port; 5607 } 5608 #endif 5609 if (net != NULL) { 5610 net->flowtype = mflowtype; 5611 net->flowid = mflowid; 5612 } 5613 if (inp == NULL) { 5614 SCTP_STAT_INCR(sctps_noport); 5615 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) { 5616 goto out; 5617 } 5618 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 5619 sctp_send_shutdown_complete2(src, dst, sh, 5620 mflowtype, mflowid, fibnum, 5621 vrf_id, port); 5622 goto out; 5623 } 5624 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) { 5625 goto out; 5626 } 5627 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) { 5628 if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) || 5629 ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) && 5630 (ch->chunk_type != SCTP_INIT))) { 5631 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5632 "Out of the blue"); 5633 sctp_send_abort(m, iphlen, src, dst, 5634 sh, 0, op_err, 5635 mflowtype, mflowid, fibnum, 5636 vrf_id, port); 5637 } 5638 } 5639 goto out; 5640 } else if (stcb == NULL) { 5641 inp_decr = inp; 5642 } 5643 SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n", 5644 (void *)m, iphlen, offset, length, (void *)stcb); 5645 if (stcb) { 5646 /* always clear this before beginning a packet */ 5647 stcb->asoc.authenticated = 0; 5648 stcb->asoc.seen_a_sack_this_pkt = 0; 5649 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n", 5650 (void *)stcb, stcb->asoc.state); 5651 5652 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) || 5653 (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) { 5654 /*- 5655 * If we hit here, we had a ref count 5656 * up when the assoc was aborted and the 5657 * timer is clearing out the assoc, we should 5658 * NOT respond to any packet.. its OOTB. 5659 */ 5660 SCTP_TCB_UNLOCK(stcb); 5661 stcb = NULL; 5662 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5663 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5664 msg); 5665 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5666 mflowtype, mflowid, inp->fibnum, 5667 vrf_id, port); 5668 goto out; 5669 } 5670 5671 } 5672 if (IS_SCTP_CONTROL(ch)) { 5673 /* process the control portion of the SCTP packet */ 5674 /* sa_ignore NO_NULL_CHK */ 5675 stcb = sctp_process_control(m, iphlen, &offset, length, 5676 src, dst, sh, ch, 5677 inp, stcb, &net, &fwd_tsn_seen, 5678 mflowtype, mflowid, fibnum, 5679 vrf_id, port); 5680 if (stcb) { 5681 /* 5682 * This covers us if the cookie-echo was there and 5683 * it changes our INP. 5684 */ 5685 inp = stcb->sctp_ep; 5686 #if defined(INET) || defined(INET6) 5687 if ((ch->chunk_type != SCTP_INITIATION) && 5688 (net != NULL) && (net->port != port)) { 5689 if (net->port == 0) { 5690 /* UDP encapsulation turned on. */ 5691 net->mtu -= sizeof(struct udphdr); 5692 if (stcb->asoc.smallest_mtu > net->mtu) { 5693 sctp_pathmtu_adjustment(stcb, net->mtu); 5694 } 5695 } else if (port == 0) { 5696 /* UDP encapsulation turned off. */ 5697 net->mtu += sizeof(struct udphdr); 5698 /* XXX Update smallest_mtu */ 5699 } 5700 net->port = port; 5701 } 5702 #endif 5703 } 5704 } else { 5705 /* 5706 * no control chunks, so pre-process DATA chunks (these 5707 * checks are taken care of by control processing) 5708 */ 5709 5710 /* 5711 * if DATA only packet, and auth is required, then punt... 5712 * can't have authenticated without any AUTH (control) 5713 * chunks 5714 */ 5715 if ((stcb != NULL) && 5716 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) { 5717 /* "silently" ignore */ 5718 SCTP_STAT_INCR(sctps_recvauthmissing); 5719 goto out; 5720 } 5721 if (stcb == NULL) { 5722 /* out of the blue DATA chunk */ 5723 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5724 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5725 msg); 5726 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5727 mflowtype, mflowid, fibnum, 5728 vrf_id, port); 5729 goto out; 5730 } 5731 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) { 5732 /* v_tag mismatch! */ 5733 SCTP_STAT_INCR(sctps_badvtag); 5734 goto out; 5735 } 5736 } 5737 5738 if (stcb == NULL) { 5739 /* 5740 * no valid TCB for this packet, or we found it's a bad 5741 * packet while processing control, or we're done with this 5742 * packet (done or skip rest of data), so we drop it... 5743 */ 5744 goto out; 5745 } 5746 5747 /* 5748 * DATA chunk processing 5749 */ 5750 /* plow through the data chunks while length > offset */ 5751 5752 /* 5753 * Rest should be DATA only. Check authentication state if AUTH for 5754 * DATA is required. 5755 */ 5756 if ((length > offset) && 5757 (stcb != NULL) && 5758 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) && 5759 !stcb->asoc.authenticated) { 5760 /* "silently" ignore */ 5761 SCTP_STAT_INCR(sctps_recvauthmissing); 5762 SCTPDBG(SCTP_DEBUG_AUTH1, 5763 "Data chunk requires AUTH, skipped\n"); 5764 goto trigger_send; 5765 } 5766 if (length > offset) { 5767 int retval; 5768 5769 /* 5770 * First check to make sure our state is correct. We would 5771 * not get here unless we really did have a tag, so we don't 5772 * abort if this happens, just dump the chunk silently. 5773 */ 5774 switch (SCTP_GET_STATE(stcb)) { 5775 case SCTP_STATE_COOKIE_ECHOED: 5776 /* 5777 * we consider data with valid tags in this state 5778 * shows us the cookie-ack was lost. Imply it was 5779 * there. 5780 */ 5781 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net); 5782 break; 5783 case SCTP_STATE_COOKIE_WAIT: 5784 /* 5785 * We consider OOTB any data sent during asoc setup. 5786 */ 5787 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5788 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5789 msg); 5790 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5791 mflowtype, mflowid, inp->fibnum, 5792 vrf_id, port); 5793 goto out; 5794 /* sa_ignore NOTREACHED */ 5795 break; 5796 case SCTP_STATE_EMPTY: /* should not happen */ 5797 case SCTP_STATE_INUSE: /* should not happen */ 5798 case SCTP_STATE_SHUTDOWN_RECEIVED: /* This is a peer error */ 5799 case SCTP_STATE_SHUTDOWN_ACK_SENT: 5800 default: 5801 goto out; 5802 /* sa_ignore NOTREACHED */ 5803 break; 5804 case SCTP_STATE_OPEN: 5805 case SCTP_STATE_SHUTDOWN_SENT: 5806 break; 5807 } 5808 /* plow through the data chunks while length > offset */ 5809 retval = sctp_process_data(mm, iphlen, &offset, length, 5810 inp, stcb, net, &high_tsn); 5811 if (retval == 2) { 5812 /* 5813 * The association aborted, NO UNLOCK needed since 5814 * the association is destroyed. 5815 */ 5816 stcb = NULL; 5817 goto out; 5818 } 5819 data_processed = 1; 5820 /* 5821 * Anything important needs to have been m_copy'ed in 5822 * process_data 5823 */ 5824 } 5825 5826 /* take care of ecn */ 5827 if ((data_processed == 1) && 5828 (stcb->asoc.ecn_supported == 1) && 5829 ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) { 5830 /* Yep, we need to add a ECNE */ 5831 sctp_send_ecn_echo(stcb, net, high_tsn); 5832 } 5833 5834 if ((data_processed == 0) && (fwd_tsn_seen)) { 5835 int was_a_gap; 5836 uint32_t highest_tsn; 5837 5838 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) { 5839 highest_tsn = stcb->asoc.highest_tsn_inside_nr_map; 5840 } else { 5841 highest_tsn = stcb->asoc.highest_tsn_inside_map; 5842 } 5843 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn); 5844 stcb->asoc.send_sack = 1; 5845 sctp_sack_check(stcb, was_a_gap); 5846 } else if (fwd_tsn_seen) { 5847 stcb->asoc.send_sack = 1; 5848 } 5849 /* trigger send of any chunks in queue... */ 5850 trigger_send: 5851 #ifdef SCTP_AUDITING_ENABLED 5852 sctp_audit_log(0xE0, 2); 5853 sctp_auditing(1, inp, stcb, net); 5854 #endif 5855 SCTPDBG(SCTP_DEBUG_INPUT1, 5856 "Check for chunk output prw:%d tqe:%d tf=%d\n", 5857 stcb->asoc.peers_rwnd, 5858 TAILQ_EMPTY(&stcb->asoc.control_send_queue), 5859 stcb->asoc.total_flight); 5860 un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight); 5861 if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 5862 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq; 5863 } 5864 if (!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue) || 5865 cnt_ctrl_ready || 5866 stcb->asoc.trigger_reset || 5867 ((un_sent) && 5868 (stcb->asoc.peers_rwnd > 0 || 5869 (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) { 5870 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n"); 5871 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 5872 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n"); 5873 } 5874 #ifdef SCTP_AUDITING_ENABLED 5875 sctp_audit_log(0xE0, 3); 5876 sctp_auditing(2, inp, stcb, net); 5877 #endif 5878 out: 5879 if (stcb != NULL) { 5880 SCTP_TCB_UNLOCK(stcb); 5881 } 5882 if (inp_decr != NULL) { 5883 /* reduce ref-count */ 5884 SCTP_INP_WLOCK(inp_decr); 5885 SCTP_INP_DECR_REF(inp_decr); 5886 SCTP_INP_WUNLOCK(inp_decr); 5887 } 5888 return; 5889 } 5890 5891 #ifdef INET 5892 void 5893 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port) 5894 { 5895 struct mbuf *m; 5896 int iphlen; 5897 uint32_t vrf_id = 0; 5898 uint8_t ecn_bits; 5899 struct sockaddr_in src, dst; 5900 struct ip *ip; 5901 struct sctphdr *sh; 5902 struct sctp_chunkhdr *ch; 5903 int length, offset; 5904 uint8_t compute_crc; 5905 uint32_t mflowid; 5906 uint8_t mflowtype; 5907 uint16_t fibnum; 5908 5909 iphlen = off; 5910 if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) { 5911 SCTP_RELEASE_PKT(i_pak); 5912 return; 5913 } 5914 m = SCTP_HEADER_TO_CHAIN(i_pak); 5915 #ifdef SCTP_MBUF_LOGGING 5916 /* Log in any input mbufs */ 5917 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5918 sctp_log_mbc(m, SCTP_MBUF_INPUT); 5919 } 5920 #endif 5921 #ifdef SCTP_PACKET_LOGGING 5922 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) { 5923 sctp_packet_log(m); 5924 } 5925 #endif 5926 SCTPDBG(SCTP_DEBUG_CRCOFFLOAD, 5927 "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n", 5928 m->m_pkthdr.len, 5929 if_name(m->m_pkthdr.rcvif), 5930 (int)m->m_pkthdr.csum_flags, CSUM_BITS); 5931 mflowid = m->m_pkthdr.flowid; 5932 mflowtype = M_HASHTYPE_GET(m); 5933 fibnum = M_GETFIB(m); 5934 SCTP_STAT_INCR(sctps_recvpackets); 5935 SCTP_STAT_INCR_COUNTER64(sctps_inpackets); 5936 /* Get IP, SCTP, and first chunk header together in the first mbuf. */ 5937 offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr); 5938 if (SCTP_BUF_LEN(m) < offset) { 5939 if ((m = m_pullup(m, offset)) == NULL) { 5940 SCTP_STAT_INCR(sctps_hdrops); 5941 return; 5942 } 5943 } 5944 ip = mtod(m, struct ip *); 5945 sh = (struct sctphdr *)((caddr_t)ip + iphlen); 5946 ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr)); 5947 offset -= sizeof(struct sctp_chunkhdr); 5948 memset(&src, 0, sizeof(struct sockaddr_in)); 5949 src.sin_family = AF_INET; 5950 src.sin_len = sizeof(struct sockaddr_in); 5951 src.sin_port = sh->src_port; 5952 src.sin_addr = ip->ip_src; 5953 memset(&dst, 0, sizeof(struct sockaddr_in)); 5954 dst.sin_family = AF_INET; 5955 dst.sin_len = sizeof(struct sockaddr_in); 5956 dst.sin_port = sh->dest_port; 5957 dst.sin_addr = ip->ip_dst; 5958 length = ntohs(ip->ip_len); 5959 /* Validate mbuf chain length with IP payload length. */ 5960 if (SCTP_HEADER_LEN(m) != length) { 5961 SCTPDBG(SCTP_DEBUG_INPUT1, 5962 "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m)); 5963 SCTP_STAT_INCR(sctps_hdrops); 5964 goto out; 5965 } 5966 /* SCTP does not allow broadcasts or multicasts */ 5967 if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) { 5968 goto out; 5969 } 5970 if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) { 5971 goto out; 5972 } 5973 ecn_bits = ip->ip_tos; 5974 if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) { 5975 SCTP_STAT_INCR(sctps_recvhwcrc); 5976 compute_crc = 0; 5977 } else { 5978 SCTP_STAT_INCR(sctps_recvswcrc); 5979 compute_crc = 1; 5980 } 5981 sctp_common_input_processing(&m, iphlen, offset, length, 5982 (struct sockaddr *)&src, 5983 (struct sockaddr *)&dst, 5984 sh, ch, 5985 compute_crc, 5986 ecn_bits, 5987 mflowtype, mflowid, fibnum, 5988 vrf_id, port); 5989 out: 5990 if (m) { 5991 sctp_m_freem(m); 5992 } 5993 return; 5994 } 5995 5996 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP) 5997 extern int *sctp_cpuarry; 5998 #endif 5999 6000 int 6001 sctp_input(struct mbuf **mp, int *offp, int proto SCTP_UNUSED) 6002 { 6003 struct mbuf *m; 6004 int off; 6005 6006 m = *mp; 6007 off = *offp; 6008 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP) 6009 if (mp_ncpus > 1) { 6010 struct ip *ip; 6011 struct sctphdr *sh; 6012 int offset; 6013 int cpu_to_use; 6014 uint32_t flowid, tag; 6015 6016 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) { 6017 flowid = m->m_pkthdr.flowid; 6018 } else { 6019 /* 6020 * No flow id built by lower layers fix it so we 6021 * create one. 6022 */ 6023 offset = off + sizeof(struct sctphdr); 6024 if (SCTP_BUF_LEN(m) < offset) { 6025 if ((m = m_pullup(m, offset)) == NULL) { 6026 SCTP_STAT_INCR(sctps_hdrops); 6027 return (IPPROTO_DONE); 6028 } 6029 } 6030 ip = mtod(m, struct ip *); 6031 sh = (struct sctphdr *)((caddr_t)ip + off); 6032 tag = htonl(sh->v_tag); 6033 flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port); 6034 m->m_pkthdr.flowid = flowid; 6035 M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE_HASH); 6036 } 6037 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus]; 6038 sctp_queue_to_mcore(m, off, cpu_to_use); 6039 return (IPPROTO_DONE); 6040 } 6041 #endif 6042 sctp_input_with_port(m, off, 0); 6043 return (IPPROTO_DONE); 6044 } 6045 #endif 6046