Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]
FreeBSD/Linux Kernel Cross Reference
sys/netinet/sctp_input.c
Version:
- FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10
SearchContext: - none - 3 - 10
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: releng/12.0/sys/netinet/sctp_input.c 339042 2018-10-01 14:05:31Z tuexen $"); 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 <netinet/in_kdtrace.h> 56 #include <sys/smp.h> 57 58 59 60 static void 61 sctp_stop_all_cookie_timers(struct sctp_tcb *stcb) 62 { 63 struct sctp_nets *net; 64 65 /* 66 * This now not only stops all cookie timers it also stops any INIT 67 * timers as well. This will make sure that the timers are stopped 68 * in all collision cases. 69 */ 70 SCTP_TCB_LOCK_ASSERT(stcb); 71 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 72 if (net->rxt_timer.type == SCTP_TIMER_TYPE_COOKIE) { 73 sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE, 74 stcb->sctp_ep, 75 stcb, 76 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_1); 77 } else if (net->rxt_timer.type == SCTP_TIMER_TYPE_INIT) { 78 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, 79 stcb->sctp_ep, 80 stcb, 81 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_2); 82 } 83 } 84 } 85 86 /* INIT handler */ 87 static void 88 sctp_handle_init(struct mbuf *m, int iphlen, int offset, 89 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 90 struct sctp_init_chunk *cp, struct sctp_inpcb *inp, 91 struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_no_unlock, 92 uint8_t mflowtype, uint32_t mflowid, 93 uint32_t vrf_id, uint16_t port) 94 { 95 struct sctp_init *init; 96 struct mbuf *op_err; 97 98 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_init: handling INIT tcb:%p\n", 99 (void *)stcb); 100 if (stcb == NULL) { 101 SCTP_INP_RLOCK(inp); 102 } 103 /* validate length */ 104 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_chunk)) { 105 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 106 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 107 mflowtype, mflowid, 108 vrf_id, port); 109 if (stcb) 110 *abort_no_unlock = 1; 111 goto outnow; 112 } 113 /* validate parameters */ 114 init = &cp->init; 115 if (init->initiate_tag == 0) { 116 /* protocol error... send abort */ 117 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 118 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 119 mflowtype, mflowid, 120 vrf_id, port); 121 if (stcb) 122 *abort_no_unlock = 1; 123 goto outnow; 124 } 125 if (ntohl(init->a_rwnd) < SCTP_MIN_RWND) { 126 /* invalid parameter... send abort */ 127 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 128 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 129 mflowtype, mflowid, 130 vrf_id, port); 131 if (stcb) 132 *abort_no_unlock = 1; 133 goto outnow; 134 } 135 if (init->num_inbound_streams == 0) { 136 /* protocol error... send abort */ 137 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 138 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 139 mflowtype, mflowid, 140 vrf_id, port); 141 if (stcb) 142 *abort_no_unlock = 1; 143 goto outnow; 144 } 145 if (init->num_outbound_streams == 0) { 146 /* protocol error... send abort */ 147 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 148 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 149 mflowtype, mflowid, 150 vrf_id, port); 151 if (stcb) 152 *abort_no_unlock = 1; 153 goto outnow; 154 } 155 if (sctp_validate_init_auth_params(m, offset + sizeof(*cp), 156 offset + ntohs(cp->ch.chunk_length))) { 157 /* auth parameter(s) error... send abort */ 158 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 159 "Problem with AUTH parameters"); 160 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 161 mflowtype, mflowid, 162 vrf_id, port); 163 if (stcb) 164 *abort_no_unlock = 1; 165 goto outnow; 166 } 167 /* We are only accepting if we have a listening socket. */ 168 if ((stcb == NULL) && 169 ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 170 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) || 171 (!SCTP_IS_LISTENING(inp)))) { 172 /* 173 * FIX ME ?? What about TCP model and we have a 174 * match/restart case? Actually no fix is needed. the lookup 175 * will always find the existing assoc so stcb would not be 176 * NULL. It may be questionable to do this since we COULD 177 * just send back the INIT-ACK and hope that the app did 178 * accept()'s by the time the COOKIE was sent. But there is 179 * a price to pay for COOKIE generation and I don't want to 180 * pay it on the chance that the app will actually do some 181 * accepts(). The App just looses and should NOT be in this 182 * state :-) 183 */ 184 if (SCTP_BASE_SYSCTL(sctp_blackhole) == 0) { 185 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 186 "No listener"); 187 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err, 188 mflowtype, mflowid, inp->fibnum, 189 vrf_id, port); 190 } 191 goto outnow; 192 } 193 if ((stcb != NULL) && 194 (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT)) { 195 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending SHUTDOWN-ACK\n"); 196 sctp_send_shutdown_ack(stcb, NULL); 197 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 198 } else { 199 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n"); 200 sctp_send_initiate_ack(inp, stcb, net, m, iphlen, offset, 201 src, dst, sh, cp, 202 mflowtype, mflowid, 203 vrf_id, port); 204 } 205 outnow: 206 if (stcb == NULL) { 207 SCTP_INP_RUNLOCK(inp); 208 } 209 } 210 211 /* 212 * process peer "INIT/INIT-ACK" chunk returns value < 0 on error 213 */ 214 215 int 216 sctp_is_there_unsent_data(struct sctp_tcb *stcb, int so_locked 217 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING) 218 SCTP_UNUSED 219 #endif 220 ) 221 { 222 int unsent_data; 223 unsigned int i; 224 struct sctp_stream_queue_pending *sp; 225 struct sctp_association *asoc; 226 227 /* 228 * This function returns if any stream has true unsent data on it. 229 * Note that as it looks through it will clean up any places that 230 * have old data that has been sent but left at top of stream queue. 231 */ 232 asoc = &stcb->asoc; 233 unsent_data = 0; 234 SCTP_TCB_SEND_LOCK(stcb); 235 if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 236 /* Check to see if some data queued */ 237 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 238 /* sa_ignore FREED_MEMORY */ 239 sp = TAILQ_FIRST(&stcb->asoc.strmout[i].outqueue); 240 if (sp == NULL) { 241 continue; 242 } 243 if ((sp->msg_is_complete) && 244 (sp->length == 0) && 245 (sp->sender_all_done)) { 246 /* 247 * We are doing differed cleanup. Last time 248 * through when we took all the data the 249 * sender_all_done was not set. 250 */ 251 if (sp->put_last_out == 0) { 252 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n"); 253 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n", 254 sp->sender_all_done, 255 sp->length, 256 sp->msg_is_complete, 257 sp->put_last_out); 258 } 259 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1); 260 TAILQ_REMOVE(&stcb->asoc.strmout[i].outqueue, sp, next); 261 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, &asoc->strmout[i], sp, 1); 262 if (sp->net) { 263 sctp_free_remote_addr(sp->net); 264 sp->net = NULL; 265 } 266 if (sp->data) { 267 sctp_m_freem(sp->data); 268 sp->data = NULL; 269 } 270 sctp_free_a_strmoq(stcb, sp, so_locked); 271 if (!TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) { 272 unsent_data++; 273 } 274 } else { 275 unsent_data++; 276 } 277 if (unsent_data > 0) { 278 break; 279 } 280 } 281 } 282 SCTP_TCB_SEND_UNLOCK(stcb); 283 return (unsent_data); 284 } 285 286 static int 287 sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb) 288 { 289 struct sctp_init *init; 290 struct sctp_association *asoc; 291 struct sctp_nets *lnet; 292 unsigned int i; 293 294 init = &cp->init; 295 asoc = &stcb->asoc; 296 /* save off parameters */ 297 asoc->peer_vtag = ntohl(init->initiate_tag); 298 asoc->peers_rwnd = ntohl(init->a_rwnd); 299 /* init tsn's */ 300 asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1; 301 302 if (!TAILQ_EMPTY(&asoc->nets)) { 303 /* update any ssthresh's that may have a default */ 304 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) { 305 lnet->ssthresh = asoc->peers_rwnd; 306 if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) { 307 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION); 308 } 309 310 } 311 } 312 SCTP_TCB_SEND_LOCK(stcb); 313 if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) { 314 unsigned int newcnt; 315 struct sctp_stream_out *outs; 316 struct sctp_stream_queue_pending *sp, *nsp; 317 struct sctp_tmit_chunk *chk, *nchk; 318 319 /* abandon the upper streams */ 320 newcnt = ntohs(init->num_inbound_streams); 321 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) { 322 if (chk->rec.data.sid >= newcnt) { 323 TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next); 324 asoc->send_queue_cnt--; 325 if (asoc->strmout[chk->rec.data.sid].chunks_on_queues > 0) { 326 asoc->strmout[chk->rec.data.sid].chunks_on_queues--; 327 #ifdef INVARIANTS 328 } else { 329 panic("No chunks on the queues for sid %u.", chk->rec.data.sid); 330 #endif 331 } 332 if (chk->data != NULL) { 333 sctp_free_bufspace(stcb, asoc, chk, 1); 334 sctp_ulp_notify(SCTP_NOTIFY_UNSENT_DG_FAIL, stcb, 335 0, chk, SCTP_SO_NOT_LOCKED); 336 if (chk->data) { 337 sctp_m_freem(chk->data); 338 chk->data = NULL; 339 } 340 } 341 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 342 /* sa_ignore FREED_MEMORY */ 343 } 344 } 345 if (asoc->strmout) { 346 for (i = newcnt; i < asoc->pre_open_streams; i++) { 347 outs = &asoc->strmout[i]; 348 TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) { 349 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1); 350 TAILQ_REMOVE(&outs->outqueue, sp, next); 351 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, outs, sp, 1); 352 sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL, 353 stcb, 0, sp, SCTP_SO_NOT_LOCKED); 354 if (sp->data) { 355 sctp_m_freem(sp->data); 356 sp->data = NULL; 357 } 358 if (sp->net) { 359 sctp_free_remote_addr(sp->net); 360 sp->net = NULL; 361 } 362 /* Free the chunk */ 363 sctp_free_a_strmoq(stcb, sp, SCTP_SO_NOT_LOCKED); 364 /* sa_ignore FREED_MEMORY */ 365 } 366 outs->state = SCTP_STREAM_CLOSED; 367 } 368 } 369 /* cut back the count */ 370 asoc->pre_open_streams = newcnt; 371 } 372 SCTP_TCB_SEND_UNLOCK(stcb); 373 asoc->streamoutcnt = asoc->pre_open_streams; 374 if (asoc->strmout) { 375 for (i = 0; i < asoc->streamoutcnt; i++) { 376 asoc->strmout[i].state = SCTP_STREAM_OPEN; 377 } 378 } 379 /* EY - nr_sack: initialize highest tsn in nr_mapping_array */ 380 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 381 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 382 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 383 } 384 /* This is the next one we expect */ 385 asoc->str_reset_seq_in = asoc->asconf_seq_in + 1; 386 387 asoc->mapping_array_base_tsn = ntohl(init->initial_tsn); 388 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in; 389 390 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 391 /* open the requested streams */ 392 393 if (asoc->strmin != NULL) { 394 /* Free the old ones */ 395 for (i = 0; i < asoc->streamincnt; i++) { 396 sctp_clean_up_stream(stcb, &asoc->strmin[i].inqueue); 397 sctp_clean_up_stream(stcb, &asoc->strmin[i].uno_inqueue); 398 } 399 SCTP_FREE(asoc->strmin, SCTP_M_STRMI); 400 } 401 if (asoc->max_inbound_streams > ntohs(init->num_outbound_streams)) { 402 asoc->streamincnt = ntohs(init->num_outbound_streams); 403 } else { 404 asoc->streamincnt = asoc->max_inbound_streams; 405 } 406 SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt * 407 sizeof(struct sctp_stream_in), SCTP_M_STRMI); 408 if (asoc->strmin == NULL) { 409 /* we didn't get memory for the streams! */ 410 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n"); 411 return (-1); 412 } 413 for (i = 0; i < asoc->streamincnt; i++) { 414 asoc->strmin[i].sid = i; 415 asoc->strmin[i].last_mid_delivered = 0xffffffff; 416 TAILQ_INIT(&asoc->strmin[i].inqueue); 417 TAILQ_INIT(&asoc->strmin[i].uno_inqueue); 418 asoc->strmin[i].pd_api_started = 0; 419 asoc->strmin[i].delivery_started = 0; 420 } 421 /* 422 * load_address_from_init will put the addresses into the 423 * association when the COOKIE is processed or the INIT-ACK is 424 * processed. Both types of COOKIE's existing and new call this 425 * routine. It will remove addresses that are no longer in the 426 * association (for the restarting case where addresses are 427 * removed). Up front when the INIT arrives we will discard it if it 428 * is a restart and new addresses have been added. 429 */ 430 /* sa_ignore MEMLEAK */ 431 return (0); 432 } 433 434 /* 435 * INIT-ACK message processing/consumption returns value < 0 on error 436 */ 437 static int 438 sctp_process_init_ack(struct mbuf *m, int iphlen, int offset, 439 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 440 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 441 struct sctp_nets *net, int *abort_no_unlock, 442 uint8_t mflowtype, uint32_t mflowid, 443 uint32_t vrf_id) 444 { 445 struct sctp_association *asoc; 446 struct mbuf *op_err; 447 int retval, abort_flag; 448 uint32_t initack_limit; 449 int nat_friendly = 0; 450 451 /* First verify that we have no illegal param's */ 452 abort_flag = 0; 453 454 op_err = sctp_arethere_unrecognized_parameters(m, 455 (offset + sizeof(struct sctp_init_chunk)), 456 &abort_flag, (struct sctp_chunkhdr *)cp, &nat_friendly); 457 if (abort_flag) { 458 /* Send an abort and notify peer */ 459 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 460 *abort_no_unlock = 1; 461 return (-1); 462 } 463 asoc = &stcb->asoc; 464 asoc->peer_supports_nat = (uint8_t)nat_friendly; 465 /* process the peer's parameters in the INIT-ACK */ 466 retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb); 467 if (retval < 0) { 468 return (retval); 469 } 470 initack_limit = offset + ntohs(cp->ch.chunk_length); 471 /* load all addresses */ 472 if ((retval = sctp_load_addresses_from_init(stcb, m, 473 (offset + sizeof(struct sctp_init_chunk)), initack_limit, 474 src, dst, NULL, stcb->asoc.port))) { 475 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 476 "Problem with address parameters"); 477 SCTPDBG(SCTP_DEBUG_INPUT1, 478 "Load addresses from INIT causes an abort %d\n", 479 retval); 480 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 481 src, dst, sh, op_err, 482 mflowtype, mflowid, 483 vrf_id, net->port); 484 *abort_no_unlock = 1; 485 return (-1); 486 } 487 /* if the peer doesn't support asconf, flush the asconf queue */ 488 if (asoc->asconf_supported == 0) { 489 struct sctp_asconf_addr *param, *nparam; 490 491 TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) { 492 TAILQ_REMOVE(&asoc->asconf_queue, param, next); 493 SCTP_FREE(param, SCTP_M_ASC_ADDR); 494 } 495 } 496 497 stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs, 498 stcb->asoc.local_hmacs); 499 if (op_err) { 500 sctp_queue_op_err(stcb, op_err); 501 /* queuing will steal away the mbuf chain to the out queue */ 502 op_err = NULL; 503 } 504 /* extract the cookie and queue it to "echo" it back... */ 505 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 506 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 507 stcb->asoc.overall_error_count, 508 0, 509 SCTP_FROM_SCTP_INPUT, 510 __LINE__); 511 } 512 stcb->asoc.overall_error_count = 0; 513 net->error_count = 0; 514 515 /* 516 * Cancel the INIT timer, We do this first before queueing the 517 * cookie. We always cancel at the primary to assue that we are 518 * canceling the timer started by the INIT which always goes to the 519 * primary. 520 */ 521 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb, 522 asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3); 523 524 /* calculate the RTO */ 525 net->RTO = sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, 526 SCTP_RTT_FROM_NON_DATA); 527 retval = sctp_send_cookie_echo(m, offset, stcb, net); 528 if (retval < 0) { 529 /* 530 * No cookie, we probably should send a op error. But in any 531 * case if there is no cookie in the INIT-ACK, we can 532 * abandon the peer, its broke. 533 */ 534 if (retval == -3) { 535 uint16_t len; 536 537 len = (uint16_t)(sizeof(struct sctp_error_missing_param) + sizeof(uint16_t)); 538 /* We abort with an error of missing mandatory param */ 539 op_err = sctp_get_mbuf_for_msg(len, 0, M_NOWAIT, 1, MT_DATA); 540 if (op_err != NULL) { 541 struct sctp_error_missing_param *cause; 542 543 SCTP_BUF_LEN(op_err) = len; 544 cause = mtod(op_err, struct sctp_error_missing_param *); 545 /* Subtract the reserved param */ 546 cause->cause.code = htons(SCTP_CAUSE_MISSING_PARAM); 547 cause->cause.length = htons(len); 548 cause->num_missing_params = htonl(1); 549 cause->type[0] = htons(SCTP_STATE_COOKIE); 550 } 551 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 552 src, dst, sh, op_err, 553 mflowtype, mflowid, 554 vrf_id, net->port); 555 *abort_no_unlock = 1; 556 } 557 return (retval); 558 } 559 560 return (0); 561 } 562 563 static void 564 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp, 565 struct sctp_tcb *stcb, struct sctp_nets *net) 566 { 567 union sctp_sockstore store; 568 struct sctp_nets *r_net, *f_net; 569 struct timeval tv; 570 int req_prim = 0; 571 uint16_t old_error_counter; 572 573 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) { 574 /* Invalid length */ 575 return; 576 } 577 578 memset(&store, 0, sizeof(store)); 579 switch (cp->heartbeat.hb_info.addr_family) { 580 #ifdef INET 581 case AF_INET: 582 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) { 583 store.sin.sin_family = cp->heartbeat.hb_info.addr_family; 584 store.sin.sin_len = cp->heartbeat.hb_info.addr_len; 585 store.sin.sin_port = stcb->rport; 586 memcpy(&store.sin.sin_addr, cp->heartbeat.hb_info.address, 587 sizeof(store.sin.sin_addr)); 588 } else { 589 return; 590 } 591 break; 592 #endif 593 #ifdef INET6 594 case AF_INET6: 595 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) { 596 store.sin6.sin6_family = cp->heartbeat.hb_info.addr_family; 597 store.sin6.sin6_len = cp->heartbeat.hb_info.addr_len; 598 store.sin6.sin6_port = stcb->rport; 599 memcpy(&store.sin6.sin6_addr, cp->heartbeat.hb_info.address, sizeof(struct in6_addr)); 600 } else { 601 return; 602 } 603 break; 604 #endif 605 default: 606 return; 607 } 608 r_net = sctp_findnet(stcb, &store.sa); 609 if (r_net == NULL) { 610 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n"); 611 return; 612 } 613 if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) && 614 (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) && 615 (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) { 616 /* 617 * If the its a HB and it's random value is correct when can 618 * confirm the destination. 619 */ 620 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 621 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) { 622 stcb->asoc.primary_destination = r_net; 623 r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY; 624 f_net = TAILQ_FIRST(&stcb->asoc.nets); 625 if (f_net != r_net) { 626 /* 627 * first one on the list is NOT the primary 628 * sctp_cmpaddr() is much more efficient if 629 * the primary is the first on the list, 630 * make it so. 631 */ 632 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next); 633 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next); 634 } 635 req_prim = 1; 636 } 637 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 638 stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 639 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, 640 r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4); 641 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 642 } 643 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 644 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 645 stcb->asoc.overall_error_count, 646 0, 647 SCTP_FROM_SCTP_INPUT, 648 __LINE__); 649 } 650 stcb->asoc.overall_error_count = 0; 651 old_error_counter = r_net->error_count; 652 r_net->error_count = 0; 653 r_net->hb_responded = 1; 654 tv.tv_sec = cp->heartbeat.hb_info.time_value_1; 655 tv.tv_usec = cp->heartbeat.hb_info.time_value_2; 656 /* Now lets do a RTO with this */ 657 r_net->RTO = sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, 658 SCTP_RTT_FROM_NON_DATA); 659 if (!(r_net->dest_state & SCTP_ADDR_REACHABLE)) { 660 r_net->dest_state |= SCTP_ADDR_REACHABLE; 661 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb, 662 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 663 } 664 if (r_net->dest_state & SCTP_ADDR_PF) { 665 r_net->dest_state &= ~SCTP_ADDR_PF; 666 stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net); 667 } 668 if (old_error_counter > 0) { 669 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 670 stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_5); 671 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 672 } 673 if (r_net == stcb->asoc.primary_destination) { 674 if (stcb->asoc.alternate) { 675 /* release the alternate, primary is good */ 676 sctp_free_remote_addr(stcb->asoc.alternate); 677 stcb->asoc.alternate = NULL; 678 } 679 } 680 /* Mobility adaptation */ 681 if (req_prim) { 682 if ((sctp_is_mobility_feature_on(stcb->sctp_ep, 683 SCTP_MOBILITY_BASE) || 684 sctp_is_mobility_feature_on(stcb->sctp_ep, 685 SCTP_MOBILITY_FASTHANDOFF)) && 686 sctp_is_mobility_feature_on(stcb->sctp_ep, 687 SCTP_MOBILITY_PRIM_DELETED)) { 688 689 sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED, 690 stcb->sctp_ep, stcb, NULL, 691 SCTP_FROM_SCTP_INPUT + SCTP_LOC_6); 692 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 693 SCTP_MOBILITY_FASTHANDOFF)) { 694 sctp_assoc_immediate_retrans(stcb, 695 stcb->asoc.primary_destination); 696 } 697 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 698 SCTP_MOBILITY_BASE)) { 699 sctp_move_chunks_from_net(stcb, 700 stcb->asoc.deleted_primary); 701 } 702 sctp_delete_prim_timer(stcb->sctp_ep, stcb, 703 stcb->asoc.deleted_primary); 704 } 705 } 706 } 707 708 static int 709 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb) 710 { 711 /* 712 * return 0 means we want you to proceed with the abort non-zero 713 * means no abort processing 714 */ 715 struct sctpasochead *head; 716 717 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || 718 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 719 atomic_add_int(&stcb->asoc.refcnt, 1); 720 SCTP_TCB_UNLOCK(stcb); 721 SCTP_INP_INFO_WLOCK(); 722 SCTP_TCB_LOCK(stcb); 723 atomic_subtract_int(&stcb->asoc.refcnt, 1); 724 } 725 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) { 726 /* generate a new vtag and send init */ 727 LIST_REMOVE(stcb, sctp_asocs); 728 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 729 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 730 /* 731 * put it in the bucket in the vtag hash of assoc's for the 732 * system 733 */ 734 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 735 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 736 SCTP_INP_INFO_WUNLOCK(); 737 return (1); 738 } 739 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) { 740 /* 741 * treat like a case where the cookie expired i.e.: - dump 742 * current cookie. - generate a new vtag. - resend init. 743 */ 744 /* generate a new vtag and send init */ 745 LIST_REMOVE(stcb, sctp_asocs); 746 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT); 747 sctp_stop_all_cookie_timers(stcb); 748 sctp_toss_old_cookies(stcb, &stcb->asoc); 749 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 750 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 751 /* 752 * put it in the bucket in the vtag hash of assoc's for the 753 * system 754 */ 755 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 756 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 757 SCTP_INP_INFO_WUNLOCK(); 758 return (1); 759 } 760 return (0); 761 } 762 763 static int 764 sctp_handle_nat_missing_state(struct sctp_tcb *stcb, 765 struct sctp_nets *net) 766 { 767 /* 768 * return 0 means we want you to proceed with the abort non-zero 769 * means no abort processing 770 */ 771 if (stcb->asoc.auth_supported == 0) { 772 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n"); 773 return (0); 774 } 775 sctp_asconf_send_nat_state_update(stcb, net); 776 return (1); 777 } 778 779 780 /* Returns 1 if the stcb was aborted, 0 otherwise */ 781 static int 782 sctp_handle_abort(struct sctp_abort_chunk *abort, 783 struct sctp_tcb *stcb, struct sctp_nets *net) 784 { 785 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 786 struct socket *so; 787 #endif 788 uint16_t len; 789 uint16_t error; 790 791 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n"); 792 if (stcb == NULL) 793 return (0); 794 795 len = ntohs(abort->ch.chunk_length); 796 if (len >= sizeof(struct sctp_chunkhdr) + sizeof(struct sctp_error_cause)) { 797 /* 798 * Need to check the cause codes for our two magic nat 799 * aborts which don't kill the assoc necessarily. 800 */ 801 struct sctp_error_cause *cause; 802 803 cause = (struct sctp_error_cause *)(abort + 1); 804 error = ntohs(cause->code); 805 if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) { 806 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n", 807 abort->ch.chunk_flags); 808 if (sctp_handle_nat_colliding_state(stcb)) { 809 return (0); 810 } 811 } else if (error == SCTP_CAUSE_NAT_MISSING_STATE) { 812 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n", 813 abort->ch.chunk_flags); 814 if (sctp_handle_nat_missing_state(stcb, net)) { 815 return (0); 816 } 817 } 818 } else { 819 error = 0; 820 } 821 /* stop any receive timers */ 822 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net, 823 SCTP_FROM_SCTP_INPUT + SCTP_LOC_7); 824 /* notify user of the abort and clean up... */ 825 sctp_abort_notification(stcb, 1, error, abort, SCTP_SO_NOT_LOCKED); 826 /* free the tcb */ 827 SCTP_STAT_INCR_COUNTER32(sctps_aborted); 828 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) || 829 (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 830 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 831 } 832 #ifdef SCTP_ASOCLOG_OF_TSNS 833 sctp_print_out_track_log(stcb); 834 #endif 835 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 836 so = SCTP_INP_SO(stcb->sctp_ep); 837 atomic_add_int(&stcb->asoc.refcnt, 1); 838 SCTP_TCB_UNLOCK(stcb); 839 SCTP_SOCKET_LOCK(so, 1); 840 SCTP_TCB_LOCK(stcb); 841 atomic_subtract_int(&stcb->asoc.refcnt, 1); 842 #endif 843 SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_WAS_ABORTED); 844 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 845 SCTP_FROM_SCTP_INPUT + SCTP_LOC_8); 846 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 847 SCTP_SOCKET_UNLOCK(so, 1); 848 #endif 849 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n"); 850 return (1); 851 } 852 853 static void 854 sctp_start_net_timers(struct sctp_tcb *stcb) 855 { 856 uint32_t cnt_hb_sent; 857 struct sctp_nets *net; 858 859 cnt_hb_sent = 0; 860 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 861 /* 862 * For each network start: 1) A pmtu timer. 2) A HB timer 3) 863 * If the dest in unconfirmed send a hb as well if under 864 * max_hb_burst have been sent. 865 */ 866 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net); 867 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net); 868 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) && 869 (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) { 870 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 871 cnt_hb_sent++; 872 } 873 } 874 if (cnt_hb_sent) { 875 sctp_chunk_output(stcb->sctp_ep, stcb, 876 SCTP_OUTPUT_FROM_COOKIE_ACK, 877 SCTP_SO_NOT_LOCKED); 878 } 879 } 880 881 882 static void 883 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp, 884 struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag) 885 { 886 struct sctp_association *asoc; 887 int some_on_streamwheel; 888 int old_state; 889 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 890 struct socket *so; 891 #endif 892 893 SCTPDBG(SCTP_DEBUG_INPUT2, 894 "sctp_handle_shutdown: handling SHUTDOWN\n"); 895 if (stcb == NULL) 896 return; 897 asoc = &stcb->asoc; 898 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || 899 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 900 return; 901 } 902 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) { 903 /* Shutdown NOT the expected size */ 904 return; 905 } 906 old_state = SCTP_GET_STATE(stcb); 907 sctp_update_acked(stcb, cp, abort_flag); 908 if (*abort_flag) { 909 return; 910 } 911 if (asoc->control_pdapi) { 912 /* 913 * With a normal shutdown we assume the end of last record. 914 */ 915 SCTP_INP_READ_LOCK(stcb->sctp_ep); 916 if (asoc->control_pdapi->on_strm_q) { 917 struct sctp_stream_in *strm; 918 919 strm = &asoc->strmin[asoc->control_pdapi->sinfo_stream]; 920 if (asoc->control_pdapi->on_strm_q == SCTP_ON_UNORDERED) { 921 /* Unordered */ 922 TAILQ_REMOVE(&strm->uno_inqueue, asoc->control_pdapi, next_instrm); 923 asoc->control_pdapi->on_strm_q = 0; 924 } else if (asoc->control_pdapi->on_strm_q == SCTP_ON_ORDERED) { 925 /* Ordered */ 926 TAILQ_REMOVE(&strm->inqueue, asoc->control_pdapi, next_instrm); 927 asoc->control_pdapi->on_strm_q = 0; 928 #ifdef INVARIANTS 929 } else { 930 panic("Unknown state on ctrl:%p on_strm_q:%d", 931 asoc->control_pdapi, 932 asoc->control_pdapi->on_strm_q); 933 #endif 934 } 935 } 936 asoc->control_pdapi->end_added = 1; 937 asoc->control_pdapi->pdapi_aborted = 1; 938 asoc->control_pdapi = NULL; 939 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 940 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 941 so = SCTP_INP_SO(stcb->sctp_ep); 942 atomic_add_int(&stcb->asoc.refcnt, 1); 943 SCTP_TCB_UNLOCK(stcb); 944 SCTP_SOCKET_LOCK(so, 1); 945 SCTP_TCB_LOCK(stcb); 946 atomic_subtract_int(&stcb->asoc.refcnt, 1); 947 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 948 /* assoc was freed while we were unlocked */ 949 SCTP_SOCKET_UNLOCK(so, 1); 950 return; 951 } 952 #endif 953 if (stcb->sctp_socket) { 954 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 955 } 956 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 957 SCTP_SOCKET_UNLOCK(so, 1); 958 #endif 959 } 960 /* goto SHUTDOWN_RECEIVED state to block new requests */ 961 if (stcb->sctp_socket) { 962 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) && 963 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) && 964 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT)) { 965 SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_RECEIVED); 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 if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 1001 SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_ACK_SENT); 1002 sctp_stop_timers_for_shutdown(stcb); 1003 sctp_send_shutdown_ack(stcb, net); 1004 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, 1005 stcb->sctp_ep, stcb, net); 1006 } else if (old_state == SCTP_STATE_SHUTDOWN_ACK_SENT) { 1007 sctp_send_shutdown_ack(stcb, net); 1008 } 1009 } 1010 } 1011 1012 static void 1013 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED, 1014 struct sctp_tcb *stcb, 1015 struct sctp_nets *net) 1016 { 1017 struct sctp_association *asoc; 1018 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1019 struct socket *so; 1020 1021 so = SCTP_INP_SO(stcb->sctp_ep); 1022 #endif 1023 SCTPDBG(SCTP_DEBUG_INPUT2, 1024 "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n"); 1025 if (stcb == NULL) 1026 return; 1027 1028 asoc = &stcb->asoc; 1029 /* process according to association state */ 1030 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || 1031 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 1032 /* unexpected SHUTDOWN-ACK... do OOTB handling... */ 1033 sctp_send_shutdown_complete(stcb, net, 1); 1034 SCTP_TCB_UNLOCK(stcb); 1035 return; 1036 } 1037 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) && 1038 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) { 1039 /* unexpected SHUTDOWN-ACK... so ignore... */ 1040 SCTP_TCB_UNLOCK(stcb); 1041 return; 1042 } 1043 if (asoc->control_pdapi) { 1044 /* 1045 * With a normal shutdown we assume the end of last record. 1046 */ 1047 SCTP_INP_READ_LOCK(stcb->sctp_ep); 1048 asoc->control_pdapi->end_added = 1; 1049 asoc->control_pdapi->pdapi_aborted = 1; 1050 asoc->control_pdapi = NULL; 1051 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 1052 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1053 atomic_add_int(&stcb->asoc.refcnt, 1); 1054 SCTP_TCB_UNLOCK(stcb); 1055 SCTP_SOCKET_LOCK(so, 1); 1056 SCTP_TCB_LOCK(stcb); 1057 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1058 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1059 /* assoc was freed while we were unlocked */ 1060 SCTP_SOCKET_UNLOCK(so, 1); 1061 return; 1062 } 1063 #endif 1064 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 1065 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1066 SCTP_SOCKET_UNLOCK(so, 1); 1067 #endif 1068 } 1069 #ifdef INVARIANTS 1070 if (!TAILQ_EMPTY(&asoc->send_queue) || 1071 !TAILQ_EMPTY(&asoc->sent_queue) || 1072 sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) { 1073 panic("Queues are not empty when handling SHUTDOWN-ACK"); 1074 } 1075 #endif 1076 /* stop the timer */ 1077 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, 1078 SCTP_FROM_SCTP_INPUT + SCTP_LOC_10); 1079 /* send SHUTDOWN-COMPLETE */ 1080 sctp_send_shutdown_complete(stcb, net, 0); 1081 /* notify upper layer protocol */ 1082 if (stcb->sctp_socket) { 1083 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1084 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 1085 stcb->sctp_socket->so_snd.sb_cc = 0; 1086 } 1087 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 1088 } 1089 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 1090 /* free the TCB but first save off the ep */ 1091 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1092 atomic_add_int(&stcb->asoc.refcnt, 1); 1093 SCTP_TCB_UNLOCK(stcb); 1094 SCTP_SOCKET_LOCK(so, 1); 1095 SCTP_TCB_LOCK(stcb); 1096 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1097 #endif 1098 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1099 SCTP_FROM_SCTP_INPUT + SCTP_LOC_11); 1100 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1101 SCTP_SOCKET_UNLOCK(so, 1); 1102 #endif 1103 } 1104 1105 static void 1106 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, uint8_t chunk_type, 1107 struct sctp_nets *net) 1108 { 1109 switch (chunk_type) { 1110 case SCTP_ASCONF_ACK: 1111 case SCTP_ASCONF: 1112 sctp_asconf_cleanup(stcb, net); 1113 break; 1114 case SCTP_IFORWARD_CUM_TSN: 1115 case SCTP_FORWARD_CUM_TSN: 1116 stcb->asoc.prsctp_supported = 0; 1117 break; 1118 default: 1119 SCTPDBG(SCTP_DEBUG_INPUT2, 1120 "Peer does not support chunk type %d (0x%x).\n", 1121 chunk_type, chunk_type); 1122 break; 1123 } 1124 } 1125 1126 /* 1127 * Skip past the param header and then we will find the param that caused the 1128 * problem. There are a number of param's in a ASCONF OR the prsctp param 1129 * these will turn of specific features. 1130 * XXX: Is this the right thing to do? 1131 */ 1132 static void 1133 sctp_process_unrecog_param(struct sctp_tcb *stcb, uint16_t parameter_type) 1134 { 1135 switch (parameter_type) { 1136 /* pr-sctp draft */ 1137 case SCTP_PRSCTP_SUPPORTED: 1138 stcb->asoc.prsctp_supported = 0; 1139 break; 1140 case SCTP_SUPPORTED_CHUNK_EXT: 1141 break; 1142 /* draft-ietf-tsvwg-addip-sctp */ 1143 case SCTP_HAS_NAT_SUPPORT: 1144 stcb->asoc.peer_supports_nat = 0; 1145 break; 1146 case SCTP_ADD_IP_ADDRESS: 1147 case SCTP_DEL_IP_ADDRESS: 1148 case SCTP_SET_PRIM_ADDR: 1149 stcb->asoc.asconf_supported = 0; 1150 break; 1151 case SCTP_SUCCESS_REPORT: 1152 case SCTP_ERROR_CAUSE_IND: 1153 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n"); 1154 SCTPDBG(SCTP_DEBUG_INPUT2, 1155 "Turning off ASCONF to this strange peer\n"); 1156 stcb->asoc.asconf_supported = 0; 1157 break; 1158 default: 1159 SCTPDBG(SCTP_DEBUG_INPUT2, 1160 "Peer does not support param type %d (0x%x)??\n", 1161 parameter_type, parameter_type); 1162 break; 1163 } 1164 } 1165 1166 static int 1167 sctp_handle_error(struct sctp_chunkhdr *ch, 1168 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 1169 { 1170 struct sctp_error_cause *cause; 1171 struct sctp_association *asoc; 1172 uint32_t remaining_length, adjust; 1173 uint16_t code, cause_code, cause_length; 1174 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1175 struct socket *so; 1176 #endif 1177 1178 /* parse through all of the errors and process */ 1179 asoc = &stcb->asoc; 1180 cause = (struct sctp_error_cause *)((caddr_t)ch + 1181 sizeof(struct sctp_chunkhdr)); 1182 remaining_length = ntohs(ch->chunk_length); 1183 if (remaining_length > limit) { 1184 remaining_length = limit; 1185 } 1186 if (remaining_length >= sizeof(struct sctp_chunkhdr)) { 1187 remaining_length -= sizeof(struct sctp_chunkhdr); 1188 } else { 1189 remaining_length = 0; 1190 } 1191 code = 0; 1192 while (remaining_length >= sizeof(struct sctp_error_cause)) { 1193 /* Process an Error Cause */ 1194 cause_code = ntohs(cause->code); 1195 cause_length = ntohs(cause->length); 1196 if ((cause_length > remaining_length) || (cause_length == 0)) { 1197 /* Invalid cause length, possibly due to truncation. */ 1198 SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in cause - bytes left: %u cause length: %u\n", 1199 remaining_length, cause_length); 1200 return (0); 1201 } 1202 if (code == 0) { 1203 /* report the first error cause */ 1204 code = cause_code; 1205 } 1206 switch (cause_code) { 1207 case SCTP_CAUSE_INVALID_STREAM: 1208 case SCTP_CAUSE_MISSING_PARAM: 1209 case SCTP_CAUSE_INVALID_PARAM: 1210 case SCTP_CAUSE_NO_USER_DATA: 1211 SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %u back? We have a bug :/ (or do they?)\n", 1212 cause_code); 1213 break; 1214 case SCTP_CAUSE_NAT_COLLIDING_STATE: 1215 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags: %x\n", 1216 ch->chunk_flags); 1217 if (sctp_handle_nat_colliding_state(stcb)) { 1218 return (0); 1219 } 1220 break; 1221 case SCTP_CAUSE_NAT_MISSING_STATE: 1222 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags: %x\n", 1223 ch->chunk_flags); 1224 if (sctp_handle_nat_missing_state(stcb, net)) { 1225 return (0); 1226 } 1227 break; 1228 case SCTP_CAUSE_STALE_COOKIE: 1229 /* 1230 * We only act if we have echoed a cookie and are 1231 * waiting. 1232 */ 1233 if ((cause_length >= sizeof(struct sctp_error_stale_cookie)) && 1234 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 1235 struct sctp_error_stale_cookie *stale_cookie; 1236 1237 stale_cookie = (struct sctp_error_stale_cookie *)cause; 1238 asoc->cookie_preserve_req = ntohl(stale_cookie->stale_time); 1239 /* Double it to be more robust on RTX */ 1240 if (asoc->cookie_preserve_req <= UINT32_MAX / 2) { 1241 asoc->cookie_preserve_req *= 2; 1242 } else { 1243 asoc->cookie_preserve_req = UINT32_MAX; 1244 } 1245 asoc->stale_cookie_count++; 1246 if (asoc->stale_cookie_count > 1247 asoc->max_init_times) { 1248 sctp_abort_notification(stcb, 0, 0, NULL, SCTP_SO_NOT_LOCKED); 1249 /* now free the asoc */ 1250 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1251 so = SCTP_INP_SO(stcb->sctp_ep); 1252 atomic_add_int(&stcb->asoc.refcnt, 1); 1253 SCTP_TCB_UNLOCK(stcb); 1254 SCTP_SOCKET_LOCK(so, 1); 1255 SCTP_TCB_LOCK(stcb); 1256 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1257 #endif 1258 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1259 SCTP_FROM_SCTP_INPUT + SCTP_LOC_12); 1260 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1261 SCTP_SOCKET_UNLOCK(so, 1); 1262 #endif 1263 return (-1); 1264 } 1265 /* blast back to INIT state */ 1266 sctp_toss_old_cookies(stcb, &stcb->asoc); 1267 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT); 1268 sctp_stop_all_cookie_timers(stcb); 1269 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 1270 } 1271 break; 1272 case SCTP_CAUSE_UNRESOLVABLE_ADDR: 1273 /* 1274 * Nothing we can do here, we don't do hostname 1275 * addresses so if the peer does not like my IPv6 1276 * (or IPv4 for that matter) it does not matter. If 1277 * they don't support that type of address, they can 1278 * NOT possibly get that packet type... i.e. with no 1279 * IPv6 you can't receive a IPv6 packet. so we can 1280 * safely ignore this one. If we ever added support 1281 * for HOSTNAME Addresses, then we would need to do 1282 * something here. 1283 */ 1284 break; 1285 case SCTP_CAUSE_UNRECOG_CHUNK: 1286 if (cause_length >= sizeof(struct sctp_error_unrecognized_chunk)) { 1287 struct sctp_error_unrecognized_chunk *unrec_chunk; 1288 1289 unrec_chunk = (struct sctp_error_unrecognized_chunk *)cause; 1290 sctp_process_unrecog_chunk(stcb, unrec_chunk->ch.chunk_type, net); 1291 } 1292 break; 1293 case SCTP_CAUSE_UNRECOG_PARAM: 1294 /* XXX: We only consider the first parameter */ 1295 if (cause_length >= sizeof(struct sctp_error_cause) + sizeof(struct sctp_paramhdr)) { 1296 struct sctp_paramhdr *unrec_parameter; 1297 1298 unrec_parameter = (struct sctp_paramhdr *)(cause + 1); 1299 sctp_process_unrecog_param(stcb, ntohs(unrec_parameter->param_type)); 1300 } 1301 break; 1302 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN: 1303 /* 1304 * We ignore this since the timer will drive out a 1305 * new cookie anyway and there timer will drive us 1306 * to send a SHUTDOWN_COMPLETE. We can't send one 1307 * here since we don't have their tag. 1308 */ 1309 break; 1310 case SCTP_CAUSE_DELETING_LAST_ADDR: 1311 case SCTP_CAUSE_RESOURCE_SHORTAGE: 1312 case SCTP_CAUSE_DELETING_SRC_ADDR: 1313 /* 1314 * We should NOT get these here, but in a 1315 * ASCONF-ACK. 1316 */ 1317 SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a error cause with code %u.\n", 1318 cause_code); 1319 break; 1320 case SCTP_CAUSE_OUT_OF_RESC: 1321 /* 1322 * And what, pray tell do we do with the fact that 1323 * the peer is out of resources? Not really sure we 1324 * could do anything but abort. I suspect this 1325 * should have came WITH an abort instead of in a 1326 * OP-ERROR. 1327 */ 1328 break; 1329 default: 1330 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown code 0x%x\n", 1331 cause_code); 1332 break; 1333 } 1334 adjust = SCTP_SIZE32(cause_length); 1335 if (remaining_length >= adjust) { 1336 remaining_length -= adjust; 1337 } else { 1338 remaining_length = 0; 1339 } 1340 cause = (struct sctp_error_cause *)((caddr_t)cause + adjust); 1341 } 1342 sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, code, ch, SCTP_SO_NOT_LOCKED); 1343 return (0); 1344 } 1345 1346 static int 1347 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset, 1348 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 1349 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 1350 struct sctp_nets *net, int *abort_no_unlock, 1351 uint8_t mflowtype, uint32_t mflowid, 1352 uint32_t vrf_id) 1353 { 1354 struct sctp_init_ack *init_ack; 1355 struct mbuf *op_err; 1356 1357 SCTPDBG(SCTP_DEBUG_INPUT2, 1358 "sctp_handle_init_ack: handling INIT-ACK\n"); 1359 1360 if (stcb == NULL) { 1361 SCTPDBG(SCTP_DEBUG_INPUT2, 1362 "sctp_handle_init_ack: TCB is null\n"); 1363 return (-1); 1364 } 1365 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) { 1366 /* Invalid length */ 1367 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1368 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1369 src, dst, sh, op_err, 1370 mflowtype, mflowid, 1371 vrf_id, net->port); 1372 *abort_no_unlock = 1; 1373 return (-1); 1374 } 1375 init_ack = &cp->init; 1376 /* validate parameters */ 1377 if (init_ack->initiate_tag == 0) { 1378 /* protocol error... send an abort */ 1379 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1380 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1381 src, dst, sh, op_err, 1382 mflowtype, mflowid, 1383 vrf_id, net->port); 1384 *abort_no_unlock = 1; 1385 return (-1); 1386 } 1387 if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) { 1388 /* protocol error... send an abort */ 1389 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1390 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1391 src, dst, sh, op_err, 1392 mflowtype, mflowid, 1393 vrf_id, net->port); 1394 *abort_no_unlock = 1; 1395 return (-1); 1396 } 1397 if (init_ack->num_inbound_streams == 0) { 1398 /* protocol error... send an abort */ 1399 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1400 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1401 src, dst, sh, op_err, 1402 mflowtype, mflowid, 1403 vrf_id, net->port); 1404 *abort_no_unlock = 1; 1405 return (-1); 1406 } 1407 if (init_ack->num_outbound_streams == 0) { 1408 /* protocol error... send an abort */ 1409 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1410 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1411 src, dst, sh, op_err, 1412 mflowtype, mflowid, 1413 vrf_id, net->port); 1414 *abort_no_unlock = 1; 1415 return (-1); 1416 } 1417 /* process according to association state... */ 1418 switch (SCTP_GET_STATE(stcb)) { 1419 case SCTP_STATE_COOKIE_WAIT: 1420 /* this is the expected state for this chunk */ 1421 /* process the INIT-ACK parameters */ 1422 if (stcb->asoc.primary_destination->dest_state & 1423 SCTP_ADDR_UNCONFIRMED) { 1424 /* 1425 * The primary is where we sent the INIT, we can 1426 * always consider it confirmed when the INIT-ACK is 1427 * returned. Do this before we load addresses 1428 * though. 1429 */ 1430 stcb->asoc.primary_destination->dest_state &= 1431 ~SCTP_ADDR_UNCONFIRMED; 1432 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 1433 stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED); 1434 } 1435 if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb, 1436 net, abort_no_unlock, 1437 mflowtype, mflowid, 1438 vrf_id) < 0) { 1439 /* error in parsing parameters */ 1440 return (-1); 1441 } 1442 /* update our state */ 1443 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n"); 1444 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_ECHOED); 1445 1446 /* reset the RTO calc */ 1447 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 1448 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 1449 stcb->asoc.overall_error_count, 1450 0, 1451 SCTP_FROM_SCTP_INPUT, 1452 __LINE__); 1453 } 1454 stcb->asoc.overall_error_count = 0; 1455 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 1456 /* 1457 * collapse the init timer back in case of a exponential 1458 * backoff 1459 */ 1460 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep, 1461 stcb, net); 1462 /* 1463 * the send at the end of the inbound data processing will 1464 * cause the cookie to be sent 1465 */ 1466 break; 1467 case SCTP_STATE_SHUTDOWN_SENT: 1468 /* incorrect state... discard */ 1469 break; 1470 case SCTP_STATE_COOKIE_ECHOED: 1471 /* incorrect state... discard */ 1472 break; 1473 case SCTP_STATE_OPEN: 1474 /* incorrect state... discard */ 1475 break; 1476 case SCTP_STATE_EMPTY: 1477 case SCTP_STATE_INUSE: 1478 default: 1479 /* incorrect state... discard */ 1480 return (-1); 1481 break; 1482 } 1483 SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n"); 1484 return (0); 1485 } 1486 1487 static struct sctp_tcb * 1488 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1489 struct sockaddr *src, struct sockaddr *dst, 1490 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1491 struct sctp_inpcb *inp, struct sctp_nets **netp, 1492 struct sockaddr *init_src, int *notification, 1493 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1494 uint8_t mflowtype, uint32_t mflowid, 1495 uint32_t vrf_id, uint16_t port); 1496 1497 1498 /* 1499 * handle a state cookie for an existing association m: input packet mbuf 1500 * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a 1501 * "split" mbuf and the cookie signature does not exist offset: offset into 1502 * mbuf to the cookie-echo chunk 1503 */ 1504 static struct sctp_tcb * 1505 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset, 1506 struct sockaddr *src, struct sockaddr *dst, 1507 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1508 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp, 1509 struct sockaddr *init_src, int *notification, 1510 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1511 uint8_t mflowtype, uint32_t mflowid, 1512 uint32_t vrf_id, uint16_t port) 1513 { 1514 struct sctp_association *asoc; 1515 struct sctp_init_chunk *init_cp, init_buf; 1516 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1517 struct sctp_nets *net; 1518 struct mbuf *op_err; 1519 struct timeval old; 1520 int init_offset, initack_offset, i; 1521 int retval; 1522 int spec_flag = 0; 1523 uint32_t how_indx; 1524 #if defined(SCTP_DETAILED_STR_STATS) 1525 int j; 1526 #endif 1527 1528 net = *netp; 1529 /* I know that the TCB is non-NULL from the caller */ 1530 asoc = &stcb->asoc; 1531 for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) { 1532 if (asoc->cookie_how[how_indx] == 0) 1533 break; 1534 } 1535 if (how_indx < sizeof(asoc->cookie_how)) { 1536 asoc->cookie_how[how_indx] = 1; 1537 } 1538 if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 1539 /* SHUTDOWN came in after sending INIT-ACK */ 1540 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination); 1541 op_err = sctp_generate_cause(SCTP_CAUSE_COOKIE_IN_SHUTDOWN, ""); 1542 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 1543 mflowtype, mflowid, inp->fibnum, 1544 vrf_id, net->port); 1545 if (how_indx < sizeof(asoc->cookie_how)) 1546 asoc->cookie_how[how_indx] = 2; 1547 return (NULL); 1548 } 1549 /* 1550 * find and validate the INIT chunk in the cookie (peer's info) the 1551 * INIT should start after the cookie-echo header struct (chunk 1552 * header, state cookie header struct) 1553 */ 1554 init_offset = offset += sizeof(struct sctp_cookie_echo_chunk); 1555 1556 init_cp = (struct sctp_init_chunk *) 1557 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 1558 (uint8_t *)&init_buf); 1559 if (init_cp == NULL) { 1560 /* could not pull a INIT chunk in cookie */ 1561 return (NULL); 1562 } 1563 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 1564 return (NULL); 1565 } 1566 /* 1567 * find and validate the INIT-ACK chunk in the cookie (my info) the 1568 * INIT-ACK follows the INIT chunk 1569 */ 1570 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 1571 initack_cp = (struct sctp_init_ack_chunk *) 1572 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 1573 (uint8_t *)&initack_buf); 1574 if (initack_cp == NULL) { 1575 /* could not pull INIT-ACK chunk in cookie */ 1576 return (NULL); 1577 } 1578 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 1579 return (NULL); 1580 } 1581 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1582 (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) { 1583 /* 1584 * case D in Section 5.2.4 Table 2: MMAA process accordingly 1585 * to get into the OPEN state 1586 */ 1587 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1588 /*- 1589 * Opps, this means that we somehow generated two vtag's 1590 * the same. I.e. we did: 1591 * Us Peer 1592 * <---INIT(tag=a)------ 1593 * ----INIT-ACK(tag=t)--> 1594 * ----INIT(tag=t)------> *1 1595 * <---INIT-ACK(tag=a)--- 1596 * <----CE(tag=t)------------- *2 1597 * 1598 * At point *1 we should be generating a different 1599 * tag t'. Which means we would throw away the CE and send 1600 * ours instead. Basically this is case C (throw away side). 1601 */ 1602 if (how_indx < sizeof(asoc->cookie_how)) 1603 asoc->cookie_how[how_indx] = 17; 1604 return (NULL); 1605 1606 } 1607 switch (SCTP_GET_STATE(stcb)) { 1608 case SCTP_STATE_COOKIE_WAIT: 1609 case SCTP_STATE_COOKIE_ECHOED: 1610 /* 1611 * INIT was sent but got a COOKIE_ECHO with the 1612 * correct tags... just accept it...but we must 1613 * process the init so that we can make sure we have 1614 * the right seq no's. 1615 */ 1616 /* First we must process the INIT !! */ 1617 retval = sctp_process_init(init_cp, stcb); 1618 if (retval < 0) { 1619 if (how_indx < sizeof(asoc->cookie_how)) 1620 asoc->cookie_how[how_indx] = 3; 1621 return (NULL); 1622 } 1623 /* we have already processed the INIT so no problem */ 1624 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, 1625 stcb, net, 1626 SCTP_FROM_SCTP_INPUT + SCTP_LOC_13); 1627 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, 1628 stcb, net, 1629 SCTP_FROM_SCTP_INPUT + SCTP_LOC_14); 1630 /* update current state */ 1631 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) 1632 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1633 else 1634 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1635 1636 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 1637 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1638 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1639 stcb->sctp_ep, stcb, asoc->primary_destination); 1640 } 1641 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1642 sctp_stop_all_cookie_timers(stcb); 1643 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1644 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1645 (!SCTP_IS_LISTENING(inp))) { 1646 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1647 struct socket *so; 1648 #endif 1649 /* 1650 * Here is where collision would go if we 1651 * did a connect() and instead got a 1652 * init/init-ack/cookie done before the 1653 * init-ack came back.. 1654 */ 1655 stcb->sctp_ep->sctp_flags |= 1656 SCTP_PCB_FLAGS_CONNECTED; 1657 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1658 so = SCTP_INP_SO(stcb->sctp_ep); 1659 atomic_add_int(&stcb->asoc.refcnt, 1); 1660 SCTP_TCB_UNLOCK(stcb); 1661 SCTP_SOCKET_LOCK(so, 1); 1662 SCTP_TCB_LOCK(stcb); 1663 atomic_add_int(&stcb->asoc.refcnt, -1); 1664 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1665 SCTP_SOCKET_UNLOCK(so, 1); 1666 return (NULL); 1667 } 1668 #endif 1669 soisconnected(stcb->sctp_socket); 1670 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1671 SCTP_SOCKET_UNLOCK(so, 1); 1672 #endif 1673 } 1674 /* notify upper layer */ 1675 *notification = SCTP_NOTIFY_ASSOC_UP; 1676 /* 1677 * since we did not send a HB make sure we don't 1678 * double things 1679 */ 1680 old.tv_sec = cookie->time_entered.tv_sec; 1681 old.tv_usec = cookie->time_entered.tv_usec; 1682 net->hb_responded = 1; 1683 net->RTO = sctp_calculate_rto(stcb, asoc, net, 1684 &old, 1685 SCTP_RTT_FROM_NON_DATA); 1686 1687 if (stcb->asoc.sctp_autoclose_ticks && 1688 (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) { 1689 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 1690 inp, stcb, NULL); 1691 } 1692 break; 1693 default: 1694 /* 1695 * we're in the OPEN state (or beyond), so peer must 1696 * have simply lost the COOKIE-ACK 1697 */ 1698 break; 1699 } /* end switch */ 1700 sctp_stop_all_cookie_timers(stcb); 1701 /* 1702 * We ignore the return code here.. not sure if we should 1703 * somehow abort.. but we do have an existing asoc. This 1704 * really should not fail. 1705 */ 1706 if (sctp_load_addresses_from_init(stcb, m, 1707 init_offset + sizeof(struct sctp_init_chunk), 1708 initack_offset, src, dst, init_src, stcb->asoc.port)) { 1709 if (how_indx < sizeof(asoc->cookie_how)) 1710 asoc->cookie_how[how_indx] = 4; 1711 return (NULL); 1712 } 1713 /* respond with a COOKIE-ACK */ 1714 sctp_toss_old_cookies(stcb, asoc); 1715 sctp_send_cookie_ack(stcb); 1716 if (how_indx < sizeof(asoc->cookie_how)) 1717 asoc->cookie_how[how_indx] = 5; 1718 return (stcb); 1719 } 1720 1721 if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1722 ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag && 1723 cookie->tie_tag_my_vtag == 0 && 1724 cookie->tie_tag_peer_vtag == 0) { 1725 /* 1726 * case C in Section 5.2.4 Table 2: XMOO silently discard 1727 */ 1728 if (how_indx < sizeof(asoc->cookie_how)) 1729 asoc->cookie_how[how_indx] = 6; 1730 return (NULL); 1731 } 1732 /* 1733 * If nat support, and the below and stcb is established, send back 1734 * a ABORT(colliding state) if we are established. 1735 */ 1736 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) && 1737 (asoc->peer_supports_nat) && 1738 ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1739 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1740 (asoc->peer_vtag == 0)))) { 1741 /* 1742 * Special case - Peer's support nat. We may have two init's 1743 * that we gave out the same tag on since one was not 1744 * established.. i.e. we get INIT from host-1 behind the nat 1745 * and we respond tag-a, we get a INIT from host-2 behind 1746 * the nat and we get tag-a again. Then we bring up host-1 1747 * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1). 1748 * Now we have colliding state. We must send an abort here 1749 * with colliding state indication. 1750 */ 1751 op_err = sctp_generate_cause(SCTP_CAUSE_NAT_COLLIDING_STATE, ""); 1752 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err, 1753 mflowtype, mflowid, inp->fibnum, 1754 vrf_id, port); 1755 return (NULL); 1756 } 1757 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1758 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1759 (asoc->peer_vtag == 0))) { 1760 /* 1761 * case B in Section 5.2.4 Table 2: MXAA or MOAA my info 1762 * should be ok, re-accept peer info 1763 */ 1764 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1765 /* 1766 * Extension of case C. If we hit this, then the 1767 * random number generator returned the same vtag 1768 * when we first sent our INIT-ACK and when we later 1769 * sent our INIT. The side with the seq numbers that 1770 * are different will be the one that normnally 1771 * would have hit case C. This in effect "extends" 1772 * our vtags in this collision case to be 64 bits. 1773 * The same collision could occur aka you get both 1774 * vtag and seq number the same twice in a row.. but 1775 * is much less likely. If it did happen then we 1776 * would proceed through and bring up the assoc.. we 1777 * may end up with the wrong stream setup however.. 1778 * which would be bad.. but there is no way to 1779 * tell.. until we send on a stream that does not 1780 * exist :-) 1781 */ 1782 if (how_indx < sizeof(asoc->cookie_how)) 1783 asoc->cookie_how[how_indx] = 7; 1784 1785 return (NULL); 1786 } 1787 if (how_indx < sizeof(asoc->cookie_how)) 1788 asoc->cookie_how[how_indx] = 8; 1789 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, 1790 SCTP_FROM_SCTP_INPUT + SCTP_LOC_15); 1791 sctp_stop_all_cookie_timers(stcb); 1792 /* 1793 * since we did not send a HB make sure we don't double 1794 * things 1795 */ 1796 net->hb_responded = 1; 1797 if (stcb->asoc.sctp_autoclose_ticks && 1798 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 1799 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, 1800 NULL); 1801 } 1802 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1803 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 1804 1805 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) { 1806 /* 1807 * Ok the peer probably discarded our data (if we 1808 * echoed a cookie+data). So anything on the 1809 * sent_queue should be marked for retransmit, we 1810 * may not get something to kick us so it COULD 1811 * still take a timeout to move these.. but it can't 1812 * hurt to mark them. 1813 */ 1814 struct sctp_tmit_chunk *chk; 1815 1816 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 1817 if (chk->sent < SCTP_DATAGRAM_RESEND) { 1818 chk->sent = SCTP_DATAGRAM_RESEND; 1819 sctp_flight_size_decrease(chk); 1820 sctp_total_flight_decrease(stcb, chk); 1821 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 1822 spec_flag++; 1823 } 1824 } 1825 1826 } 1827 /* process the INIT info (peer's info) */ 1828 retval = sctp_process_init(init_cp, stcb); 1829 if (retval < 0) { 1830 if (how_indx < sizeof(asoc->cookie_how)) 1831 asoc->cookie_how[how_indx] = 9; 1832 return (NULL); 1833 } 1834 if (sctp_load_addresses_from_init(stcb, m, 1835 init_offset + sizeof(struct sctp_init_chunk), 1836 initack_offset, src, dst, init_src, stcb->asoc.port)) { 1837 if (how_indx < sizeof(asoc->cookie_how)) 1838 asoc->cookie_how[how_indx] = 10; 1839 return (NULL); 1840 } 1841 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || 1842 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 1843 *notification = SCTP_NOTIFY_ASSOC_UP; 1844 1845 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1846 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1847 (!SCTP_IS_LISTENING(inp))) { 1848 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1849 struct socket *so; 1850 #endif 1851 stcb->sctp_ep->sctp_flags |= 1852 SCTP_PCB_FLAGS_CONNECTED; 1853 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1854 so = SCTP_INP_SO(stcb->sctp_ep); 1855 atomic_add_int(&stcb->asoc.refcnt, 1); 1856 SCTP_TCB_UNLOCK(stcb); 1857 SCTP_SOCKET_LOCK(so, 1); 1858 SCTP_TCB_LOCK(stcb); 1859 atomic_add_int(&stcb->asoc.refcnt, -1); 1860 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1861 SCTP_SOCKET_UNLOCK(so, 1); 1862 return (NULL); 1863 } 1864 #endif 1865 soisconnected(stcb->sctp_socket); 1866 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1867 SCTP_SOCKET_UNLOCK(so, 1); 1868 #endif 1869 } 1870 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) 1871 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1872 else 1873 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1874 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1875 } else if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) { 1876 SCTP_STAT_INCR_COUNTER32(sctps_restartestab); 1877 } else { 1878 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1879 } 1880 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 1881 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1882 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1883 stcb->sctp_ep, stcb, asoc->primary_destination); 1884 } 1885 sctp_stop_all_cookie_timers(stcb); 1886 sctp_toss_old_cookies(stcb, asoc); 1887 sctp_send_cookie_ack(stcb); 1888 if (spec_flag) { 1889 /* 1890 * only if we have retrans set do we do this. What 1891 * this call does is get only the COOKIE-ACK out and 1892 * then when we return the normal call to 1893 * sctp_chunk_output will get the retrans out behind 1894 * this. 1895 */ 1896 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED); 1897 } 1898 if (how_indx < sizeof(asoc->cookie_how)) 1899 asoc->cookie_how[how_indx] = 11; 1900 1901 return (stcb); 1902 } 1903 if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1904 ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) && 1905 cookie->tie_tag_my_vtag == asoc->my_vtag_nonce && 1906 cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce && 1907 cookie->tie_tag_peer_vtag != 0) { 1908 struct sctpasochead *head; 1909 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1910 struct socket *so; 1911 #endif 1912 1913 if (asoc->peer_supports_nat) { 1914 /* 1915 * This is a gross gross hack. Just call the 1916 * cookie_new code since we are allowing a duplicate 1917 * association. I hope this works... 1918 */ 1919 return (sctp_process_cookie_new(m, iphlen, offset, src, dst, 1920 sh, cookie, cookie_len, 1921 inp, netp, init_src, notification, 1922 auth_skipped, auth_offset, auth_len, 1923 mflowtype, mflowid, 1924 vrf_id, port)); 1925 } 1926 /* 1927 * case A in Section 5.2.4 Table 2: XXMM (peer restarted) 1928 */ 1929 /* temp code */ 1930 if (how_indx < sizeof(asoc->cookie_how)) 1931 asoc->cookie_how[how_indx] = 12; 1932 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, 1933 SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 1934 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, 1935 SCTP_FROM_SCTP_INPUT + SCTP_LOC_17); 1936 1937 /* notify upper layer */ 1938 *notification = SCTP_NOTIFY_ASSOC_RESTART; 1939 atomic_add_int(&stcb->asoc.refcnt, 1); 1940 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_OPEN) && 1941 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) && 1942 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT)) { 1943 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1944 } 1945 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) { 1946 SCTP_STAT_INCR_GAUGE32(sctps_restartestab); 1947 } else if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) { 1948 SCTP_STAT_INCR_GAUGE32(sctps_collisionestab); 1949 } 1950 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1951 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 1952 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1953 stcb->sctp_ep, stcb, asoc->primary_destination); 1954 1955 } else if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) { 1956 /* move to OPEN state, if not in SHUTDOWN_SENT */ 1957 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 1958 } 1959 asoc->pre_open_streams = 1960 ntohs(initack_cp->init.num_outbound_streams); 1961 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 1962 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 1963 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 1964 1965 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 1966 1967 asoc->str_reset_seq_in = asoc->init_seq_number; 1968 1969 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 1970 if (asoc->mapping_array) { 1971 memset(asoc->mapping_array, 0, 1972 asoc->mapping_array_size); 1973 } 1974 if (asoc->nr_mapping_array) { 1975 memset(asoc->nr_mapping_array, 0, 1976 asoc->mapping_array_size); 1977 } 1978 SCTP_TCB_UNLOCK(stcb); 1979 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1980 so = SCTP_INP_SO(stcb->sctp_ep); 1981 SCTP_SOCKET_LOCK(so, 1); 1982 #endif 1983 SCTP_INP_INFO_WLOCK(); 1984 SCTP_INP_WLOCK(stcb->sctp_ep); 1985 SCTP_TCB_LOCK(stcb); 1986 atomic_add_int(&stcb->asoc.refcnt, -1); 1987 /* send up all the data */ 1988 SCTP_TCB_SEND_LOCK(stcb); 1989 1990 sctp_report_all_outbound(stcb, 0, 1, SCTP_SO_LOCKED); 1991 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 1992 stcb->asoc.strmout[i].chunks_on_queues = 0; 1993 #if defined(SCTP_DETAILED_STR_STATS) 1994 for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) { 1995 asoc->strmout[i].abandoned_sent[j] = 0; 1996 asoc->strmout[i].abandoned_unsent[j] = 0; 1997 } 1998 #else 1999 asoc->strmout[i].abandoned_sent[0] = 0; 2000 asoc->strmout[i].abandoned_unsent[0] = 0; 2001 #endif 2002 stcb->asoc.strmout[i].sid = i; 2003 stcb->asoc.strmout[i].next_mid_ordered = 0; 2004 stcb->asoc.strmout[i].next_mid_unordered = 0; 2005 stcb->asoc.strmout[i].last_msg_incomplete = 0; 2006 } 2007 /* process the INIT-ACK info (my info) */ 2008 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 2009 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 2010 2011 /* pull from vtag hash */ 2012 LIST_REMOVE(stcb, sctp_asocs); 2013 /* re-insert to new vtag position */ 2014 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, 2015 SCTP_BASE_INFO(hashasocmark))]; 2016 /* 2017 * put it in the bucket in the vtag hash of assoc's for the 2018 * system 2019 */ 2020 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 2021 2022 SCTP_TCB_SEND_UNLOCK(stcb); 2023 SCTP_INP_WUNLOCK(stcb->sctp_ep); 2024 SCTP_INP_INFO_WUNLOCK(); 2025 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2026 SCTP_SOCKET_UNLOCK(so, 1); 2027 #endif 2028 asoc->total_flight = 0; 2029 asoc->total_flight_count = 0; 2030 /* process the INIT info (peer's info) */ 2031 retval = sctp_process_init(init_cp, stcb); 2032 if (retval < 0) { 2033 if (how_indx < sizeof(asoc->cookie_how)) 2034 asoc->cookie_how[how_indx] = 13; 2035 2036 return (NULL); 2037 } 2038 /* 2039 * since we did not send a HB make sure we don't double 2040 * things 2041 */ 2042 net->hb_responded = 1; 2043 2044 if (sctp_load_addresses_from_init(stcb, m, 2045 init_offset + sizeof(struct sctp_init_chunk), 2046 initack_offset, src, dst, init_src, stcb->asoc.port)) { 2047 if (how_indx < sizeof(asoc->cookie_how)) 2048 asoc->cookie_how[how_indx] = 14; 2049 2050 return (NULL); 2051 } 2052 /* respond with a COOKIE-ACK */ 2053 sctp_stop_all_cookie_timers(stcb); 2054 sctp_toss_old_cookies(stcb, asoc); 2055 sctp_send_cookie_ack(stcb); 2056 if (how_indx < sizeof(asoc->cookie_how)) 2057 asoc->cookie_how[how_indx] = 15; 2058 2059 return (stcb); 2060 } 2061 if (how_indx < sizeof(asoc->cookie_how)) 2062 asoc->cookie_how[how_indx] = 16; 2063 /* all other cases... */ 2064 return (NULL); 2065 } 2066 2067 2068 /* 2069 * handle a state cookie for a new association m: input packet mbuf chain-- 2070 * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf 2071 * and the cookie signature does not exist offset: offset into mbuf to the 2072 * cookie-echo chunk length: length of the cookie chunk to: where the init 2073 * was from returns a new TCB 2074 */ 2075 static struct sctp_tcb * 2076 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 2077 struct sockaddr *src, struct sockaddr *dst, 2078 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 2079 struct sctp_inpcb *inp, struct sctp_nets **netp, 2080 struct sockaddr *init_src, int *notification, 2081 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2082 uint8_t mflowtype, uint32_t mflowid, 2083 uint32_t vrf_id, uint16_t port) 2084 { 2085 struct sctp_tcb *stcb; 2086 struct sctp_init_chunk *init_cp, init_buf; 2087 struct sctp_init_ack_chunk *initack_cp, initack_buf; 2088 union sctp_sockstore store; 2089 struct sctp_association *asoc; 2090 int init_offset, initack_offset, initack_limit; 2091 int retval; 2092 int error = 0; 2093 uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE]; 2094 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2095 struct socket *so; 2096 2097 so = SCTP_INP_SO(inp); 2098 #endif 2099 2100 /* 2101 * find and validate the INIT chunk in the cookie (peer's info) the 2102 * INIT should start after the cookie-echo header struct (chunk 2103 * header, state cookie header struct) 2104 */ 2105 init_offset = offset + sizeof(struct sctp_cookie_echo_chunk); 2106 init_cp = (struct sctp_init_chunk *) 2107 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 2108 (uint8_t *)&init_buf); 2109 if (init_cp == NULL) { 2110 /* could not pull a INIT chunk in cookie */ 2111 SCTPDBG(SCTP_DEBUG_INPUT1, 2112 "process_cookie_new: could not pull INIT chunk hdr\n"); 2113 return (NULL); 2114 } 2115 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 2116 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n"); 2117 return (NULL); 2118 } 2119 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 2120 /* 2121 * find and validate the INIT-ACK chunk in the cookie (my info) the 2122 * INIT-ACK follows the INIT chunk 2123 */ 2124 initack_cp = (struct sctp_init_ack_chunk *) 2125 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 2126 (uint8_t *)&initack_buf); 2127 if (initack_cp == NULL) { 2128 /* could not pull INIT-ACK chunk in cookie */ 2129 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n"); 2130 return (NULL); 2131 } 2132 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 2133 return (NULL); 2134 } 2135 /* 2136 * NOTE: We can't use the INIT_ACK's chk_length to determine the 2137 * "initack_limit" value. This is because the chk_length field 2138 * includes the length of the cookie, but the cookie is omitted when 2139 * the INIT and INIT_ACK are tacked onto the cookie... 2140 */ 2141 initack_limit = offset + cookie_len; 2142 2143 /* 2144 * now that we know the INIT/INIT-ACK are in place, create a new TCB 2145 * and popluate 2146 */ 2147 2148 /* 2149 * Here we do a trick, we set in NULL for the proc/thread argument. 2150 * We do this since in effect we only use the p argument when the 2151 * socket is unbound and we must do an implicit bind. Since we are 2152 * getting a cookie, we cannot be unbound. 2153 */ 2154 stcb = sctp_aloc_assoc(inp, init_src, &error, 2155 ntohl(initack_cp->init.initiate_tag), vrf_id, 2156 ntohs(initack_cp->init.num_outbound_streams), 2157 port, 2158 (struct thread *)NULL 2159 ); 2160 if (stcb == NULL) { 2161 struct mbuf *op_err; 2162 2163 /* memory problem? */ 2164 SCTPDBG(SCTP_DEBUG_INPUT1, 2165 "process_cookie_new: no room for another TCB!\n"); 2166 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2167 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2168 src, dst, sh, op_err, 2169 mflowtype, mflowid, 2170 vrf_id, port); 2171 return (NULL); 2172 } 2173 /* get the correct sctp_nets */ 2174 if (netp) 2175 *netp = sctp_findnet(stcb, init_src); 2176 2177 asoc = &stcb->asoc; 2178 /* get scope variables out of cookie */ 2179 asoc->scope.ipv4_local_scope = cookie->ipv4_scope; 2180 asoc->scope.site_scope = cookie->site_scope; 2181 asoc->scope.local_scope = cookie->local_scope; 2182 asoc->scope.loopback_scope = cookie->loopback_scope; 2183 2184 if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) || 2185 (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) { 2186 struct mbuf *op_err; 2187 2188 /* 2189 * Houston we have a problem. The EP changed while the 2190 * cookie was in flight. Only recourse is to abort the 2191 * association. 2192 */ 2193 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2194 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2195 src, dst, sh, op_err, 2196 mflowtype, mflowid, 2197 vrf_id, port); 2198 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2199 atomic_add_int(&stcb->asoc.refcnt, 1); 2200 SCTP_TCB_UNLOCK(stcb); 2201 SCTP_SOCKET_LOCK(so, 1); 2202 SCTP_TCB_LOCK(stcb); 2203 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2204 #endif 2205 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2206 SCTP_FROM_SCTP_INPUT + SCTP_LOC_18); 2207 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2208 SCTP_SOCKET_UNLOCK(so, 1); 2209 #endif 2210 return (NULL); 2211 } 2212 /* process the INIT-ACK info (my info) */ 2213 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 2214 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 2215 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 2216 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 2217 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 2218 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 2219 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 2220 asoc->str_reset_seq_in = asoc->init_seq_number; 2221 2222 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 2223 2224 /* process the INIT info (peer's info) */ 2225 if (netp) 2226 retval = sctp_process_init(init_cp, stcb); 2227 else 2228 retval = 0; 2229 if (retval < 0) { 2230 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2231 atomic_add_int(&stcb->asoc.refcnt, 1); 2232 SCTP_TCB_UNLOCK(stcb); 2233 SCTP_SOCKET_LOCK(so, 1); 2234 SCTP_TCB_LOCK(stcb); 2235 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2236 #endif 2237 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2238 SCTP_FROM_SCTP_INPUT + SCTP_LOC_19); 2239 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2240 SCTP_SOCKET_UNLOCK(so, 1); 2241 #endif 2242 return (NULL); 2243 } 2244 /* load all addresses */ 2245 if (sctp_load_addresses_from_init(stcb, m, 2246 init_offset + sizeof(struct sctp_init_chunk), initack_offset, 2247 src, dst, init_src, port)) { 2248 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2249 atomic_add_int(&stcb->asoc.refcnt, 1); 2250 SCTP_TCB_UNLOCK(stcb); 2251 SCTP_SOCKET_LOCK(so, 1); 2252 SCTP_TCB_LOCK(stcb); 2253 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2254 #endif 2255 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2256 SCTP_FROM_SCTP_INPUT + SCTP_LOC_20); 2257 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2258 SCTP_SOCKET_UNLOCK(so, 1); 2259 #endif 2260 return (NULL); 2261 } 2262 /* 2263 * verify any preceding AUTH chunk that was skipped 2264 */ 2265 /* pull the local authentication parameters from the cookie/init-ack */ 2266 sctp_auth_get_cookie_params(stcb, m, 2267 initack_offset + sizeof(struct sctp_init_ack_chunk), 2268 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk))); 2269 if (auth_skipped) { 2270 struct sctp_auth_chunk *auth; 2271 2272 auth = (struct sctp_auth_chunk *) 2273 sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf); 2274 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) { 2275 /* auth HMAC failed, dump the assoc and packet */ 2276 SCTPDBG(SCTP_DEBUG_AUTH1, 2277 "COOKIE-ECHO: AUTH failed\n"); 2278 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2279 atomic_add_int(&stcb->asoc.refcnt, 1); 2280 SCTP_TCB_UNLOCK(stcb); 2281 SCTP_SOCKET_LOCK(so, 1); 2282 SCTP_TCB_LOCK(stcb); 2283 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2284 #endif 2285 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2286 SCTP_FROM_SCTP_INPUT + SCTP_LOC_21); 2287 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2288 SCTP_SOCKET_UNLOCK(so, 1); 2289 #endif 2290 return (NULL); 2291 } else { 2292 /* remaining chunks checked... good to go */ 2293 stcb->asoc.authenticated = 1; 2294 } 2295 } 2296 2297 /* 2298 * if we're doing ASCONFs, check to see if we have any new local 2299 * addresses that need to get added to the peer (eg. addresses 2300 * changed while cookie echo in flight). This needs to be done 2301 * after we go to the OPEN state to do the correct asconf 2302 * processing. else, make sure we have the correct addresses in our 2303 * lists 2304 */ 2305 2306 /* warning, we re-use sin, sin6, sa_store here! */ 2307 /* pull in local_address (our "from" address) */ 2308 switch (cookie->laddr_type) { 2309 #ifdef INET 2310 case SCTP_IPV4_ADDRESS: 2311 /* source addr is IPv4 */ 2312 memset(&store.sin, 0, sizeof(struct sockaddr_in)); 2313 store.sin.sin_family = AF_INET; 2314 store.sin.sin_len = sizeof(struct sockaddr_in); 2315 store.sin.sin_addr.s_addr = cookie->laddress[0]; 2316 break; 2317 #endif 2318 #ifdef INET6 2319 case SCTP_IPV6_ADDRESS: 2320 /* source addr is IPv6 */ 2321 memset(&store.sin6, 0, sizeof(struct sockaddr_in6)); 2322 store.sin6.sin6_family = AF_INET6; 2323 store.sin6.sin6_len = sizeof(struct sockaddr_in6); 2324 store.sin6.sin6_scope_id = cookie->scope_id; 2325 memcpy(&store.sin6.sin6_addr, cookie->laddress, sizeof(struct in6_addr)); 2326 break; 2327 #endif 2328 default: 2329 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2330 atomic_add_int(&stcb->asoc.refcnt, 1); 2331 SCTP_TCB_UNLOCK(stcb); 2332 SCTP_SOCKET_LOCK(so, 1); 2333 SCTP_TCB_LOCK(stcb); 2334 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2335 #endif 2336 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2337 SCTP_FROM_SCTP_INPUT + SCTP_LOC_22); 2338 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2339 SCTP_SOCKET_UNLOCK(so, 1); 2340 #endif 2341 return (NULL); 2342 } 2343 2344 /* update current state */ 2345 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2346 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 2347 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2348 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2349 stcb->sctp_ep, stcb, asoc->primary_destination); 2350 } 2351 sctp_stop_all_cookie_timers(stcb); 2352 SCTP_STAT_INCR_COUNTER32(sctps_passiveestab); 2353 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2354 2355 /* set up to notify upper layer */ 2356 *notification = SCTP_NOTIFY_ASSOC_UP; 2357 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2358 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 2359 (!SCTP_IS_LISTENING(inp))) { 2360 /* 2361 * This is an endpoint that called connect() how it got a 2362 * cookie that is NEW is a bit of a mystery. It must be that 2363 * the INIT was sent, but before it got there.. a complete 2364 * INIT/INIT-ACK/COOKIE arrived. But of course then it 2365 * should have went to the other code.. not here.. oh well.. 2366 * a bit of protection is worth having.. 2367 */ 2368 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2369 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2370 atomic_add_int(&stcb->asoc.refcnt, 1); 2371 SCTP_TCB_UNLOCK(stcb); 2372 SCTP_SOCKET_LOCK(so, 1); 2373 SCTP_TCB_LOCK(stcb); 2374 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2375 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2376 SCTP_SOCKET_UNLOCK(so, 1); 2377 return (NULL); 2378 } 2379 #endif 2380 soisconnected(stcb->sctp_socket); 2381 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2382 SCTP_SOCKET_UNLOCK(so, 1); 2383 #endif 2384 } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 2385 (SCTP_IS_LISTENING(inp))) { 2386 /* 2387 * We don't want to do anything with this one. Since it is 2388 * the listening guy. The timer will get started for 2389 * accepted connections in the caller. 2390 */ 2391 ; 2392 } 2393 /* since we did not send a HB make sure we don't double things */ 2394 if ((netp) && (*netp)) 2395 (*netp)->hb_responded = 1; 2396 2397 if (stcb->asoc.sctp_autoclose_ticks && 2398 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2399 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL); 2400 } 2401 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 2402 if ((netp != NULL) && (*netp != NULL)) { 2403 struct timeval old; 2404 2405 /* calculate the RTT and set the encaps port */ 2406 old.tv_sec = cookie->time_entered.tv_sec; 2407 old.tv_usec = cookie->time_entered.tv_usec; 2408 (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp, 2409 &old, SCTP_RTT_FROM_NON_DATA); 2410 } 2411 /* respond with a COOKIE-ACK */ 2412 sctp_send_cookie_ack(stcb); 2413 2414 /* 2415 * check the address lists for any ASCONFs that need to be sent 2416 * AFTER the cookie-ack is sent 2417 */ 2418 sctp_check_address_list(stcb, m, 2419 initack_offset + sizeof(struct sctp_init_ack_chunk), 2420 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)), 2421 &store.sa, cookie->local_scope, cookie->site_scope, 2422 cookie->ipv4_scope, cookie->loopback_scope); 2423 2424 2425 return (stcb); 2426 } 2427 2428 /* 2429 * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e 2430 * we NEED to make sure we are not already using the vtag. If so we 2431 * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit! 2432 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag, 2433 SCTP_BASE_INFO(hashasocmark))]; 2434 LIST_FOREACH(stcb, head, sctp_asocs) { 2435 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep)) { 2436 -- SEND ABORT - TRY AGAIN -- 2437 } 2438 } 2439 */ 2440 2441 /* 2442 * handles a COOKIE-ECHO message stcb: modified to either a new or left as 2443 * existing (non-NULL) TCB 2444 */ 2445 static struct mbuf * 2446 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset, 2447 struct sockaddr *src, struct sockaddr *dst, 2448 struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp, 2449 struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp, 2450 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2451 struct sctp_tcb **locked_tcb, 2452 uint8_t mflowtype, uint32_t mflowid, 2453 uint32_t vrf_id, uint16_t port) 2454 { 2455 struct sctp_state_cookie *cookie; 2456 struct sctp_tcb *l_stcb = *stcb; 2457 struct sctp_inpcb *l_inp; 2458 struct sockaddr *to; 2459 struct sctp_pcb *ep; 2460 struct mbuf *m_sig; 2461 uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE]; 2462 uint8_t *sig; 2463 uint8_t cookie_ok = 0; 2464 unsigned int sig_offset, cookie_offset; 2465 unsigned int cookie_len; 2466 struct timeval now; 2467 struct timeval time_expires; 2468 int notification = 0; 2469 struct sctp_nets *netl; 2470 int had_a_existing_tcb = 0; 2471 int send_int_conf = 0; 2472 #ifdef INET 2473 struct sockaddr_in sin; 2474 #endif 2475 #ifdef INET6 2476 struct sockaddr_in6 sin6; 2477 #endif 2478 2479 SCTPDBG(SCTP_DEBUG_INPUT2, 2480 "sctp_handle_cookie: handling COOKIE-ECHO\n"); 2481 2482 if (inp_p == NULL) { 2483 return (NULL); 2484 } 2485 cookie = &cp->cookie; 2486 cookie_offset = offset + sizeof(struct sctp_chunkhdr); 2487 cookie_len = ntohs(cp->ch.chunk_length); 2488 2489 if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) + 2490 sizeof(struct sctp_init_chunk) + 2491 sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) { 2492 /* cookie too small */ 2493 return (NULL); 2494 } 2495 if ((cookie->peerport != sh->src_port) || 2496 (cookie->myport != sh->dest_port) || 2497 (cookie->my_vtag != sh->v_tag)) { 2498 /* 2499 * invalid ports or bad tag. Note that we always leave the 2500 * v_tag in the header in network order and when we stored 2501 * it in the my_vtag slot we also left it in network order. 2502 * This maintains the match even though it may be in the 2503 * opposite byte order of the machine :-> 2504 */ 2505 return (NULL); 2506 } 2507 /* 2508 * split off the signature into its own mbuf (since it should not be 2509 * calculated in the sctp_hmac_m() call). 2510 */ 2511 sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE; 2512 m_sig = m_split(m, sig_offset, M_NOWAIT); 2513 if (m_sig == NULL) { 2514 /* out of memory or ?? */ 2515 return (NULL); 2516 } 2517 #ifdef SCTP_MBUF_LOGGING 2518 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 2519 sctp_log_mbc(m_sig, SCTP_MBUF_SPLIT); 2520 } 2521 #endif 2522 2523 /* 2524 * compute the signature/digest for the cookie 2525 */ 2526 ep = &(*inp_p)->sctp_ep; 2527 l_inp = *inp_p; 2528 if (l_stcb) { 2529 SCTP_TCB_UNLOCK(l_stcb); 2530 } 2531 SCTP_INP_RLOCK(l_inp); 2532 if (l_stcb) { 2533 SCTP_TCB_LOCK(l_stcb); 2534 } 2535 /* which cookie is it? */ 2536 if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) && 2537 (ep->current_secret_number != ep->last_secret_number)) { 2538 /* it's the old cookie */ 2539 (void)sctp_hmac_m(SCTP_HMAC, 2540 (uint8_t *)ep->secret_key[(int)ep->last_secret_number], 2541 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2542 } else { 2543 /* it's the current cookie */ 2544 (void)sctp_hmac_m(SCTP_HMAC, 2545 (uint8_t *)ep->secret_key[(int)ep->current_secret_number], 2546 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2547 } 2548 /* get the signature */ 2549 SCTP_INP_RUNLOCK(l_inp); 2550 sig = (uint8_t *)sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *)&tmp_sig); 2551 if (sig == NULL) { 2552 /* couldn't find signature */ 2553 sctp_m_freem(m_sig); 2554 return (NULL); 2555 } 2556 /* compare the received digest with the computed digest */ 2557 if (timingsafe_bcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) { 2558 /* try the old cookie? */ 2559 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) && 2560 (ep->current_secret_number != ep->last_secret_number)) { 2561 /* compute digest with old */ 2562 (void)sctp_hmac_m(SCTP_HMAC, 2563 (uint8_t *)ep->secret_key[(int)ep->last_secret_number], 2564 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2565 /* compare */ 2566 if (timingsafe_bcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0) 2567 cookie_ok = 1; 2568 } 2569 } else { 2570 cookie_ok = 1; 2571 } 2572 2573 /* 2574 * Now before we continue we must reconstruct our mbuf so that 2575 * normal processing of any other chunks will work. 2576 */ 2577 { 2578 struct mbuf *m_at; 2579 2580 m_at = m; 2581 while (SCTP_BUF_NEXT(m_at) != NULL) { 2582 m_at = SCTP_BUF_NEXT(m_at); 2583 } 2584 SCTP_BUF_NEXT(m_at) = m_sig; 2585 } 2586 2587 if (cookie_ok == 0) { 2588 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n"); 2589 SCTPDBG(SCTP_DEBUG_INPUT2, 2590 "offset = %u, cookie_offset = %u, sig_offset = %u\n", 2591 (uint32_t)offset, cookie_offset, sig_offset); 2592 return (NULL); 2593 } 2594 2595 /* 2596 * check the cookie timestamps to be sure it's not stale 2597 */ 2598 (void)SCTP_GETTIME_TIMEVAL(&now); 2599 /* Expire time is in Ticks, so we convert to seconds */ 2600 time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life); 2601 time_expires.tv_usec = cookie->time_entered.tv_usec; 2602 if (timevalcmp(&now, &time_expires, >)) { 2603 /* cookie is stale! */ 2604 struct mbuf *op_err; 2605 struct sctp_error_stale_cookie *cause; 2606 struct timeval diff; 2607 uint32_t staleness; 2608 2609 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_error_stale_cookie), 2610 0, M_NOWAIT, 1, MT_DATA); 2611 if (op_err == NULL) { 2612 /* FOOBAR */ 2613 return (NULL); 2614 } 2615 /* Set the len */ 2616 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_error_stale_cookie); 2617 cause = mtod(op_err, struct sctp_error_stale_cookie *); 2618 cause->cause.code = htons(SCTP_CAUSE_STALE_COOKIE); 2619 cause->cause.length = htons((sizeof(struct sctp_paramhdr) + 2620 (sizeof(uint32_t)))); 2621 diff = now; 2622 timevalsub(&diff, &time_expires); 2623 if ((uint32_t)diff.tv_sec > UINT32_MAX / 1000000) { 2624 staleness = UINT32_MAX; 2625 } else { 2626 staleness = diff.tv_sec * 1000000; 2627 } 2628 if (UINT32_MAX - staleness >= (uint32_t)diff.tv_usec) { 2629 staleness += diff.tv_usec; 2630 } else { 2631 staleness = UINT32_MAX; 2632 } 2633 cause->stale_time = htonl(staleness); 2634 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 2635 mflowtype, mflowid, l_inp->fibnum, 2636 vrf_id, port); 2637 return (NULL); 2638 } 2639 /* 2640 * Now we must see with the lookup address if we have an existing 2641 * asoc. This will only happen if we were in the COOKIE-WAIT state 2642 * and a INIT collided with us and somewhere the peer sent the 2643 * cookie on another address besides the single address our assoc 2644 * had for him. In this case we will have one of the tie-tags set at 2645 * least AND the address field in the cookie can be used to look it 2646 * up. 2647 */ 2648 to = NULL; 2649 switch (cookie->addr_type) { 2650 #ifdef INET6 2651 case SCTP_IPV6_ADDRESS: 2652 memset(&sin6, 0, sizeof(sin6)); 2653 sin6.sin6_family = AF_INET6; 2654 sin6.sin6_len = sizeof(sin6); 2655 sin6.sin6_port = sh->src_port; 2656 sin6.sin6_scope_id = cookie->scope_id; 2657 memcpy(&sin6.sin6_addr.s6_addr, cookie->address, 2658 sizeof(sin6.sin6_addr.s6_addr)); 2659 to = (struct sockaddr *)&sin6; 2660 break; 2661 #endif 2662 #ifdef INET 2663 case SCTP_IPV4_ADDRESS: 2664 memset(&sin, 0, sizeof(sin)); 2665 sin.sin_family = AF_INET; 2666 sin.sin_len = sizeof(sin); 2667 sin.sin_port = sh->src_port; 2668 sin.sin_addr.s_addr = cookie->address[0]; 2669 to = (struct sockaddr *)&sin; 2670 break; 2671 #endif 2672 default: 2673 /* This should not happen */ 2674 return (NULL); 2675 } 2676 if (*stcb == NULL) { 2677 /* Yep, lets check */ 2678 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL); 2679 if (*stcb == NULL) { 2680 /* 2681 * We should have only got back the same inp. If we 2682 * got back a different ep we have a problem. The 2683 * original findep got back l_inp and now 2684 */ 2685 if (l_inp != *inp_p) { 2686 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n"); 2687 } 2688 } else { 2689 if (*locked_tcb == NULL) { 2690 /* 2691 * In this case we found the assoc only 2692 * after we locked the create lock. This 2693 * means we are in a colliding case and we 2694 * must make sure that we unlock the tcb if 2695 * its one of the cases where we throw away 2696 * the incoming packets. 2697 */ 2698 *locked_tcb = *stcb; 2699 2700 /* 2701 * We must also increment the inp ref count 2702 * since the ref_count flags was set when we 2703 * did not find the TCB, now we found it 2704 * which reduces the refcount.. we must 2705 * raise it back out to balance it all :-) 2706 */ 2707 SCTP_INP_INCR_REF((*stcb)->sctp_ep); 2708 if ((*stcb)->sctp_ep != l_inp) { 2709 SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n", 2710 (void *)(*stcb)->sctp_ep, (void *)l_inp); 2711 } 2712 } 2713 } 2714 } 2715 2716 cookie_len -= SCTP_SIGNATURE_SIZE; 2717 if (*stcb == NULL) { 2718 /* this is the "normal" case... get a new TCB */ 2719 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh, 2720 cookie, cookie_len, *inp_p, 2721 netp, to, ¬ification, 2722 auth_skipped, auth_offset, auth_len, 2723 mflowtype, mflowid, 2724 vrf_id, port); 2725 } else { 2726 /* this is abnormal... cookie-echo on existing TCB */ 2727 had_a_existing_tcb = 1; 2728 *stcb = sctp_process_cookie_existing(m, iphlen, offset, 2729 src, dst, sh, 2730 cookie, cookie_len, *inp_p, *stcb, netp, to, 2731 ¬ification, auth_skipped, auth_offset, auth_len, 2732 mflowtype, mflowid, 2733 vrf_id, port); 2734 } 2735 2736 if (*stcb == NULL) { 2737 /* still no TCB... must be bad cookie-echo */ 2738 return (NULL); 2739 } 2740 if (*netp != NULL) { 2741 (*netp)->flowtype = mflowtype; 2742 (*netp)->flowid = mflowid; 2743 } 2744 /* 2745 * Ok, we built an association so confirm the address we sent the 2746 * INIT-ACK to. 2747 */ 2748 netl = sctp_findnet(*stcb, to); 2749 /* 2750 * This code should in theory NOT run but 2751 */ 2752 if (netl == NULL) { 2753 /* TSNH! Huh, why do I need to add this address here? */ 2754 if (sctp_add_remote_addr(*stcb, to, NULL, port, 2755 SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) { 2756 return (NULL); 2757 } 2758 netl = sctp_findnet(*stcb, to); 2759 } 2760 if (netl) { 2761 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) { 2762 netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 2763 (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL, 2764 netl); 2765 send_int_conf = 1; 2766 } 2767 } 2768 sctp_start_net_timers(*stcb); 2769 if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) { 2770 if (!had_a_existing_tcb || 2771 (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) { 2772 /* 2773 * If we have a NEW cookie or the connect never 2774 * reached the connected state during collision we 2775 * must do the TCP accept thing. 2776 */ 2777 struct socket *so, *oso; 2778 struct sctp_inpcb *inp; 2779 2780 if (notification == SCTP_NOTIFY_ASSOC_RESTART) { 2781 /* 2782 * For a restart we will keep the same 2783 * socket, no need to do anything. I THINK!! 2784 */ 2785 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2786 if (send_int_conf) { 2787 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2788 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2789 } 2790 return (m); 2791 } 2792 oso = (*inp_p)->sctp_socket; 2793 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2794 SCTP_TCB_UNLOCK((*stcb)); 2795 CURVNET_SET(oso->so_vnet); 2796 so = sonewconn(oso, 0 2797 ); 2798 CURVNET_RESTORE(); 2799 SCTP_TCB_LOCK((*stcb)); 2800 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2801 2802 if (so == NULL) { 2803 struct mbuf *op_err; 2804 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2805 struct socket *pcb_so; 2806 #endif 2807 /* Too many sockets */ 2808 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n"); 2809 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2810 sctp_abort_association(*inp_p, NULL, m, iphlen, 2811 src, dst, sh, op_err, 2812 mflowtype, mflowid, 2813 vrf_id, port); 2814 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2815 pcb_so = SCTP_INP_SO(*inp_p); 2816 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2817 SCTP_TCB_UNLOCK((*stcb)); 2818 SCTP_SOCKET_LOCK(pcb_so, 1); 2819 SCTP_TCB_LOCK((*stcb)); 2820 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2821 #endif 2822 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, 2823 SCTP_FROM_SCTP_INPUT + SCTP_LOC_23); 2824 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2825 SCTP_SOCKET_UNLOCK(pcb_so, 1); 2826 #endif 2827 return (NULL); 2828 } 2829 inp = (struct sctp_inpcb *)so->so_pcb; 2830 SCTP_INP_INCR_REF(inp); 2831 /* 2832 * We add the unbound flag here so that if we get an 2833 * soabort() before we get the move_pcb done, we 2834 * will properly cleanup. 2835 */ 2836 inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE | 2837 SCTP_PCB_FLAGS_CONNECTED | 2838 SCTP_PCB_FLAGS_IN_TCPPOOL | 2839 SCTP_PCB_FLAGS_UNBOUND | 2840 (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) | 2841 SCTP_PCB_FLAGS_DONT_WAKE); 2842 inp->sctp_features = (*inp_p)->sctp_features; 2843 inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features; 2844 inp->sctp_socket = so; 2845 inp->sctp_frag_point = (*inp_p)->sctp_frag_point; 2846 inp->max_cwnd = (*inp_p)->max_cwnd; 2847 inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off; 2848 inp->ecn_supported = (*inp_p)->ecn_supported; 2849 inp->prsctp_supported = (*inp_p)->prsctp_supported; 2850 inp->auth_supported = (*inp_p)->auth_supported; 2851 inp->asconf_supported = (*inp_p)->asconf_supported; 2852 inp->reconfig_supported = (*inp_p)->reconfig_supported; 2853 inp->nrsack_supported = (*inp_p)->nrsack_supported; 2854 inp->pktdrop_supported = (*inp_p)->pktdrop_supported; 2855 inp->partial_delivery_point = (*inp_p)->partial_delivery_point; 2856 inp->sctp_context = (*inp_p)->sctp_context; 2857 inp->local_strreset_support = (*inp_p)->local_strreset_support; 2858 inp->fibnum = (*inp_p)->fibnum; 2859 inp->inp_starting_point_for_iterator = NULL; 2860 /* 2861 * copy in the authentication parameters from the 2862 * original endpoint 2863 */ 2864 if (inp->sctp_ep.local_hmacs) 2865 sctp_free_hmaclist(inp->sctp_ep.local_hmacs); 2866 inp->sctp_ep.local_hmacs = 2867 sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs); 2868 if (inp->sctp_ep.local_auth_chunks) 2869 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks); 2870 inp->sctp_ep.local_auth_chunks = 2871 sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks); 2872 2873 /* 2874 * Now we must move it from one hash table to 2875 * another and get the tcb in the right place. 2876 */ 2877 2878 /* 2879 * This is where the one-2-one socket is put into 2880 * the accept state waiting for the accept! 2881 */ 2882 if (*stcb) { 2883 SCTP_ADD_SUBSTATE(*stcb, SCTP_STATE_IN_ACCEPT_QUEUE); 2884 } 2885 sctp_move_pcb_and_assoc(*inp_p, inp, *stcb); 2886 2887 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2888 SCTP_TCB_UNLOCK((*stcb)); 2889 2890 sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb, 2891 0); 2892 SCTP_TCB_LOCK((*stcb)); 2893 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2894 2895 2896 /* 2897 * now we must check to see if we were aborted while 2898 * the move was going on and the lock/unlock 2899 * happened. 2900 */ 2901 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 2902 /* 2903 * yep it was, we leave the assoc attached 2904 * to the socket since the sctp_inpcb_free() 2905 * call will send an abort for us. 2906 */ 2907 SCTP_INP_DECR_REF(inp); 2908 return (NULL); 2909 } 2910 SCTP_INP_DECR_REF(inp); 2911 /* Switch over to the new guy */ 2912 *inp_p = inp; 2913 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2914 if (send_int_conf) { 2915 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2916 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2917 } 2918 2919 /* 2920 * Pull it from the incomplete queue and wake the 2921 * guy 2922 */ 2923 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2924 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2925 SCTP_TCB_UNLOCK((*stcb)); 2926 SCTP_SOCKET_LOCK(so, 1); 2927 #endif 2928 soisconnected(so); 2929 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2930 SCTP_TCB_LOCK((*stcb)); 2931 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2932 SCTP_SOCKET_UNLOCK(so, 1); 2933 #endif 2934 return (m); 2935 } 2936 } 2937 if (notification) { 2938 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2939 } 2940 if (send_int_conf) { 2941 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2942 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2943 } 2944 return (m); 2945 } 2946 2947 static void 2948 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED, 2949 struct sctp_tcb *stcb, struct sctp_nets *net) 2950 { 2951 /* cp must not be used, others call this without a c-ack :-) */ 2952 struct sctp_association *asoc; 2953 2954 SCTPDBG(SCTP_DEBUG_INPUT2, 2955 "sctp_handle_cookie_ack: handling COOKIE-ACK\n"); 2956 if ((stcb == NULL) || (net == NULL)) { 2957 return; 2958 } 2959 2960 asoc = &stcb->asoc; 2961 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 2962 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 2963 asoc->overall_error_count, 2964 0, 2965 SCTP_FROM_SCTP_INPUT, 2966 __LINE__); 2967 } 2968 asoc->overall_error_count = 0; 2969 sctp_stop_all_cookie_timers(stcb); 2970 /* process according to association state */ 2971 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) { 2972 /* state change only needed when I am in right state */ 2973 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2974 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 2975 sctp_start_net_timers(stcb); 2976 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2977 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2978 stcb->sctp_ep, stcb, asoc->primary_destination); 2979 2980 } 2981 /* update RTO */ 2982 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 2983 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2984 if (asoc->overall_error_count == 0) { 2985 net->RTO = sctp_calculate_rto(stcb, asoc, net, 2986 &asoc->time_entered, 2987 SCTP_RTT_FROM_NON_DATA); 2988 } 2989 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 2990 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2991 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2992 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 2993 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2994 struct socket *so; 2995 2996 #endif 2997 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2998 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2999 so = SCTP_INP_SO(stcb->sctp_ep); 3000 atomic_add_int(&stcb->asoc.refcnt, 1); 3001 SCTP_TCB_UNLOCK(stcb); 3002 SCTP_SOCKET_LOCK(so, 1); 3003 SCTP_TCB_LOCK(stcb); 3004 atomic_subtract_int(&stcb->asoc.refcnt, 1); 3005 #endif 3006 if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) { 3007 soisconnected(stcb->sctp_socket); 3008 } 3009 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3010 SCTP_SOCKET_UNLOCK(so, 1); 3011 #endif 3012 } 3013 /* 3014 * since we did not send a HB make sure we don't double 3015 * things 3016 */ 3017 net->hb_responded = 1; 3018 3019 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 3020 /* 3021 * We don't need to do the asconf thing, nor hb or 3022 * autoclose if the socket is closed. 3023 */ 3024 goto closed_socket; 3025 } 3026 3027 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 3028 stcb, net); 3029 3030 3031 if (stcb->asoc.sctp_autoclose_ticks && 3032 sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) { 3033 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 3034 stcb->sctp_ep, stcb, NULL); 3035 } 3036 /* 3037 * send ASCONF if parameters are pending and ASCONFs are 3038 * allowed (eg. addresses changed when init/cookie echo were 3039 * in flight) 3040 */ 3041 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) && 3042 (stcb->asoc.asconf_supported == 1) && 3043 (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) { 3044 #ifdef SCTP_TIMER_BASED_ASCONF 3045 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, 3046 stcb->sctp_ep, stcb, 3047 stcb->asoc.primary_destination); 3048 #else 3049 sctp_send_asconf(stcb, stcb->asoc.primary_destination, 3050 SCTP_ADDR_NOT_LOCKED); 3051 #endif 3052 } 3053 } 3054 closed_socket: 3055 /* Toss the cookie if I can */ 3056 sctp_toss_old_cookies(stcb, asoc); 3057 if (!TAILQ_EMPTY(&asoc->sent_queue)) { 3058 /* Restart the timer if we have pending data */ 3059 struct sctp_tmit_chunk *chk; 3060 3061 chk = TAILQ_FIRST(&asoc->sent_queue); 3062 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 3063 } 3064 } 3065 3066 static void 3067 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp, 3068 struct sctp_tcb *stcb) 3069 { 3070 struct sctp_nets *net; 3071 struct sctp_tmit_chunk *lchk; 3072 struct sctp_ecne_chunk bkup; 3073 uint8_t override_bit; 3074 uint32_t tsn, window_data_tsn; 3075 int len; 3076 unsigned int pkt_cnt; 3077 3078 len = ntohs(cp->ch.chunk_length); 3079 if ((len != sizeof(struct sctp_ecne_chunk)) && 3080 (len != sizeof(struct old_sctp_ecne_chunk))) { 3081 return; 3082 } 3083 if (len == sizeof(struct old_sctp_ecne_chunk)) { 3084 /* Its the old format */ 3085 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk)); 3086 bkup.num_pkts_since_cwr = htonl(1); 3087 cp = &bkup; 3088 } 3089 SCTP_STAT_INCR(sctps_recvecne); 3090 tsn = ntohl(cp->tsn); 3091 pkt_cnt = ntohl(cp->num_pkts_since_cwr); 3092 lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead); 3093 if (lchk == NULL) { 3094 window_data_tsn = stcb->asoc.sending_seq - 1; 3095 } else { 3096 window_data_tsn = lchk->rec.data.tsn; 3097 } 3098 3099 /* Find where it was sent to if possible. */ 3100 net = NULL; 3101 TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) { 3102 if (lchk->rec.data.tsn == tsn) { 3103 net = lchk->whoTo; 3104 net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send; 3105 break; 3106 } 3107 if (SCTP_TSN_GT(lchk->rec.data.tsn, tsn)) { 3108 break; 3109 } 3110 } 3111 if (net == NULL) { 3112 /* 3113 * What to do. A previous send of a CWR was possibly lost. 3114 * See how old it is, we may have it marked on the actual 3115 * net. 3116 */ 3117 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 3118 if (tsn == net->last_cwr_tsn) { 3119 /* Found him, send it off */ 3120 break; 3121 } 3122 } 3123 if (net == NULL) { 3124 /* 3125 * If we reach here, we need to send a special CWR 3126 * that says hey, we did this a long time ago and 3127 * you lost the response. 3128 */ 3129 net = TAILQ_FIRST(&stcb->asoc.nets); 3130 if (net == NULL) { 3131 /* TSNH */ 3132 return; 3133 } 3134 override_bit = SCTP_CWR_REDUCE_OVERRIDE; 3135 } else { 3136 override_bit = 0; 3137 } 3138 } else { 3139 override_bit = 0; 3140 } 3141 if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) && 3142 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 3143 /* 3144 * JRS - Use the congestion control given in the pluggable 3145 * CC module 3146 */ 3147 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt); 3148 /* 3149 * We reduce once every RTT. So we will only lower cwnd at 3150 * the next sending seq i.e. the window_data_tsn 3151 */ 3152 net->cwr_window_tsn = window_data_tsn; 3153 net->ecn_ce_pkt_cnt += pkt_cnt; 3154 net->lost_cnt = pkt_cnt; 3155 net->last_cwr_tsn = tsn; 3156 } else { 3157 override_bit |= SCTP_CWR_IN_SAME_WINDOW; 3158 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) && 3159 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 3160 /* 3161 * Another loss in the same window update how many 3162 * marks/packets lost we have had. 3163 */ 3164 int cnt = 1; 3165 3166 if (pkt_cnt > net->lost_cnt) { 3167 /* Should be the case */ 3168 cnt = (pkt_cnt - net->lost_cnt); 3169 net->ecn_ce_pkt_cnt += cnt; 3170 } 3171 net->lost_cnt = pkt_cnt; 3172 net->last_cwr_tsn = tsn; 3173 /* 3174 * Most CC functions will ignore this call, since we 3175 * are in-window yet of the initial CE the peer saw. 3176 */ 3177 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt); 3178 } 3179 } 3180 /* 3181 * We always send a CWR this way if our previous one was lost our 3182 * peer will get an update, or if it is not time again to reduce we 3183 * still get the cwr to the peer. Note we set the override when we 3184 * could not find the TSN on the chunk or the destination network. 3185 */ 3186 sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit); 3187 } 3188 3189 static void 3190 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net) 3191 { 3192 /* 3193 * Here we get a CWR from the peer. We must look in the outqueue and 3194 * make sure that we have a covered ECNE in the control chunk part. 3195 * If so remove it. 3196 */ 3197 struct sctp_tmit_chunk *chk, *nchk; 3198 struct sctp_ecne_chunk *ecne; 3199 int override; 3200 uint32_t cwr_tsn; 3201 3202 cwr_tsn = ntohl(cp->tsn); 3203 override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE; 3204 TAILQ_FOREACH_SAFE(chk, &stcb->asoc.control_send_queue, sctp_next, nchk) { 3205 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) { 3206 continue; 3207 } 3208 if ((override == 0) && (chk->whoTo != net)) { 3209 /* Must be from the right src unless override is set */ 3210 continue; 3211 } 3212 ecne = mtod(chk->data, struct sctp_ecne_chunk *); 3213 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) { 3214 /* this covers this ECNE, we can remove it */ 3215 stcb->asoc.ecn_echo_cnt_onq--; 3216 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, 3217 sctp_next); 3218 stcb->asoc.ctrl_queue_cnt--; 3219 sctp_m_freem(chk->data); 3220 chk->data = NULL; 3221 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3222 if (override == 0) { 3223 break; 3224 } 3225 } 3226 } 3227 } 3228 3229 static void 3230 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED, 3231 struct sctp_tcb *stcb, struct sctp_nets *net) 3232 { 3233 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3234 struct socket *so; 3235 #endif 3236 3237 SCTPDBG(SCTP_DEBUG_INPUT2, 3238 "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n"); 3239 if (stcb == NULL) 3240 return; 3241 3242 /* process according to association state */ 3243 if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 3244 /* unexpected SHUTDOWN-COMPLETE... so ignore... */ 3245 SCTPDBG(SCTP_DEBUG_INPUT2, 3246 "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n"); 3247 SCTP_TCB_UNLOCK(stcb); 3248 return; 3249 } 3250 /* notify upper layer protocol */ 3251 if (stcb->sctp_socket) { 3252 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 3253 } 3254 #ifdef INVARIANTS 3255 if (!TAILQ_EMPTY(&stcb->asoc.send_queue) || 3256 !TAILQ_EMPTY(&stcb->asoc.sent_queue) || 3257 sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) { 3258 panic("Queues are not empty when handling SHUTDOWN-COMPLETE"); 3259 } 3260 #endif 3261 /* stop the timer */ 3262 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, 3263 SCTP_FROM_SCTP_INPUT + SCTP_LOC_24); 3264 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 3265 /* free the TCB */ 3266 SCTPDBG(SCTP_DEBUG_INPUT2, 3267 "sctp_handle_shutdown_complete: calls free-asoc\n"); 3268 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3269 so = SCTP_INP_SO(stcb->sctp_ep); 3270 atomic_add_int(&stcb->asoc.refcnt, 1); 3271 SCTP_TCB_UNLOCK(stcb); 3272 SCTP_SOCKET_LOCK(so, 1); 3273 SCTP_TCB_LOCK(stcb); 3274 atomic_subtract_int(&stcb->asoc.refcnt, 1); 3275 #endif 3276 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 3277 SCTP_FROM_SCTP_INPUT + SCTP_LOC_25); 3278 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3279 SCTP_SOCKET_UNLOCK(so, 1); 3280 #endif 3281 return; 3282 } 3283 3284 static int 3285 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc, 3286 struct sctp_nets *net, uint8_t flg) 3287 { 3288 switch (desc->chunk_type) { 3289 case SCTP_DATA: 3290 /* find the tsn to resend (possibly */ 3291 { 3292 uint32_t tsn; 3293 struct sctp_tmit_chunk *tp1; 3294 3295 tsn = ntohl(desc->tsn_ifany); 3296 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3297 if (tp1->rec.data.tsn == tsn) { 3298 /* found it */ 3299 break; 3300 } 3301 if (SCTP_TSN_GT(tp1->rec.data.tsn, tsn)) { 3302 /* not found */ 3303 tp1 = NULL; 3304 break; 3305 } 3306 } 3307 if (tp1 == NULL) { 3308 /* 3309 * Do it the other way , aka without paying 3310 * attention to queue seq order. 3311 */ 3312 SCTP_STAT_INCR(sctps_pdrpdnfnd); 3313 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3314 if (tp1->rec.data.tsn == tsn) { 3315 /* found it */ 3316 break; 3317 } 3318 } 3319 } 3320 if (tp1 == NULL) { 3321 SCTP_STAT_INCR(sctps_pdrptsnnf); 3322 } 3323 if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) { 3324 uint8_t *ddp; 3325 3326 if (((flg & SCTP_BADCRC) == 0) && 3327 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3328 return (0); 3329 } 3330 if ((stcb->asoc.peers_rwnd == 0) && 3331 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3332 SCTP_STAT_INCR(sctps_pdrpdiwnp); 3333 return (0); 3334 } 3335 if (stcb->asoc.peers_rwnd == 0 && 3336 (flg & SCTP_FROM_MIDDLE_BOX)) { 3337 SCTP_STAT_INCR(sctps_pdrpdizrw); 3338 return (0); 3339 } 3340 ddp = (uint8_t *)(mtod(tp1->data, caddr_t)+ 3341 sizeof(struct sctp_data_chunk)); 3342 { 3343 unsigned int iii; 3344 3345 for (iii = 0; iii < sizeof(desc->data_bytes); 3346 iii++) { 3347 if (ddp[iii] != desc->data_bytes[iii]) { 3348 SCTP_STAT_INCR(sctps_pdrpbadd); 3349 return (-1); 3350 } 3351 } 3352 } 3353 3354 if (tp1->do_rtt) { 3355 /* 3356 * this guy had a RTO calculation 3357 * pending on it, cancel it 3358 */ 3359 if (tp1->whoTo->rto_needed == 0) { 3360 tp1->whoTo->rto_needed = 1; 3361 } 3362 tp1->do_rtt = 0; 3363 } 3364 SCTP_STAT_INCR(sctps_pdrpmark); 3365 if (tp1->sent != SCTP_DATAGRAM_RESEND) 3366 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3367 /* 3368 * mark it as if we were doing a FR, since 3369 * we will be getting gap ack reports behind 3370 * the info from the router. 3371 */ 3372 tp1->rec.data.doing_fast_retransmit = 1; 3373 /* 3374 * mark the tsn with what sequences can 3375 * cause a new FR. 3376 */ 3377 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) { 3378 tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq; 3379 } else { 3380 tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.tsn; 3381 } 3382 3383 /* restart the timer */ 3384 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3385 stcb, tp1->whoTo, 3386 SCTP_FROM_SCTP_INPUT + SCTP_LOC_26); 3387 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3388 stcb, tp1->whoTo); 3389 3390 /* fix counts and things */ 3391 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 3392 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP, 3393 tp1->whoTo->flight_size, 3394 tp1->book_size, 3395 (uint32_t)(uintptr_t)stcb, 3396 tp1->rec.data.tsn); 3397 } 3398 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3399 sctp_flight_size_decrease(tp1); 3400 sctp_total_flight_decrease(stcb, tp1); 3401 } 3402 tp1->sent = SCTP_DATAGRAM_RESEND; 3403 } { 3404 /* audit code */ 3405 unsigned int audit; 3406 3407 audit = 0; 3408 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3409 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3410 audit++; 3411 } 3412 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue, 3413 sctp_next) { 3414 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3415 audit++; 3416 } 3417 if (audit != stcb->asoc.sent_queue_retran_cnt) { 3418 SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n", 3419 audit, stcb->asoc.sent_queue_retran_cnt); 3420 #ifndef SCTP_AUDITING_ENABLED 3421 stcb->asoc.sent_queue_retran_cnt = audit; 3422 #endif 3423 } 3424 } 3425 } 3426 break; 3427 case SCTP_ASCONF: 3428 { 3429 struct sctp_tmit_chunk *asconf; 3430 3431 TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue, 3432 sctp_next) { 3433 if (asconf->rec.chunk_id.id == SCTP_ASCONF) { 3434 break; 3435 } 3436 } 3437 if (asconf) { 3438 if (asconf->sent != SCTP_DATAGRAM_RESEND) 3439 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3440 asconf->sent = SCTP_DATAGRAM_RESEND; 3441 asconf->snd_count--; 3442 } 3443 } 3444 break; 3445 case SCTP_INITIATION: 3446 /* resend the INIT */ 3447 stcb->asoc.dropped_special_cnt++; 3448 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) { 3449 /* 3450 * If we can get it in, in a few attempts we do 3451 * this, otherwise we let the timer fire. 3452 */ 3453 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, 3454 stcb, net, 3455 SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 3456 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 3457 } 3458 break; 3459 case SCTP_SELECTIVE_ACK: 3460 case SCTP_NR_SELECTIVE_ACK: 3461 /* resend the sack */ 3462 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED); 3463 break; 3464 case SCTP_HEARTBEAT_REQUEST: 3465 /* resend a demand HB */ 3466 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) { 3467 /* 3468 * Only retransmit if we KNOW we wont destroy the 3469 * tcb 3470 */ 3471 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 3472 } 3473 break; 3474 case SCTP_SHUTDOWN: 3475 sctp_send_shutdown(stcb, net); 3476 break; 3477 case SCTP_SHUTDOWN_ACK: 3478 sctp_send_shutdown_ack(stcb, net); 3479 break; 3480 case SCTP_COOKIE_ECHO: 3481 { 3482 struct sctp_tmit_chunk *cookie; 3483 3484 cookie = NULL; 3485 TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, 3486 sctp_next) { 3487 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) { 3488 break; 3489 } 3490 } 3491 if (cookie) { 3492 if (cookie->sent != SCTP_DATAGRAM_RESEND) 3493 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3494 cookie->sent = SCTP_DATAGRAM_RESEND; 3495 sctp_stop_all_cookie_timers(stcb); 3496 } 3497 } 3498 break; 3499 case SCTP_COOKIE_ACK: 3500 sctp_send_cookie_ack(stcb); 3501 break; 3502 case SCTP_ASCONF_ACK: 3503 /* resend last asconf ack */ 3504 sctp_send_asconf_ack(stcb); 3505 break; 3506 case SCTP_IFORWARD_CUM_TSN: 3507 case SCTP_FORWARD_CUM_TSN: 3508 send_forward_tsn(stcb, &stcb->asoc); 3509 break; 3510 /* can't do anything with these */ 3511 case SCTP_PACKET_DROPPED: 3512 case SCTP_INITIATION_ACK: /* this should not happen */ 3513 case SCTP_HEARTBEAT_ACK: 3514 case SCTP_ABORT_ASSOCIATION: 3515 case SCTP_OPERATION_ERROR: 3516 case SCTP_SHUTDOWN_COMPLETE: 3517 case SCTP_ECN_ECHO: 3518 case SCTP_ECN_CWR: 3519 default: 3520 break; 3521 } 3522 return (0); 3523 } 3524 3525 void 3526 sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list) 3527 { 3528 uint32_t i; 3529 uint16_t temp; 3530 3531 /* 3532 * We set things to 0xffffffff since this is the last delivered 3533 * sequence and we will be sending in 0 after the reset. 3534 */ 3535 3536 if (number_entries) { 3537 for (i = 0; i < number_entries; i++) { 3538 temp = ntohs(list[i]); 3539 if (temp >= stcb->asoc.streamincnt) { 3540 continue; 3541 } 3542 stcb->asoc.strmin[temp].last_mid_delivered = 0xffffffff; 3543 } 3544 } else { 3545 list = NULL; 3546 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3547 stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff; 3548 } 3549 } 3550 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3551 } 3552 3553 static void 3554 sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list) 3555 { 3556 uint32_t i; 3557 uint16_t temp; 3558 3559 if (number_entries > 0) { 3560 for (i = 0; i < number_entries; i++) { 3561 temp = ntohs(list[i]); 3562 if (temp >= stcb->asoc.streamoutcnt) { 3563 /* no such stream */ 3564 continue; 3565 } 3566 stcb->asoc.strmout[temp].next_mid_ordered = 0; 3567 stcb->asoc.strmout[temp].next_mid_unordered = 0; 3568 } 3569 } else { 3570 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3571 stcb->asoc.strmout[i].next_mid_ordered = 0; 3572 stcb->asoc.strmout[i].next_mid_unordered = 0; 3573 } 3574 } 3575 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3576 } 3577 3578 static void 3579 sctp_reset_clear_pending(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list) 3580 { 3581 uint32_t i; 3582 uint16_t temp; 3583 3584 if (number_entries > 0) { 3585 for (i = 0; i < number_entries; i++) { 3586 temp = ntohs(list[i]); 3587 if (temp >= stcb->asoc.streamoutcnt) { 3588 /* no such stream */ 3589 continue; 3590 } 3591 stcb->asoc.strmout[temp].state = SCTP_STREAM_OPEN; 3592 } 3593 } else { 3594 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3595 stcb->asoc.strmout[i].state = SCTP_STREAM_OPEN; 3596 } 3597 } 3598 } 3599 3600 3601 struct sctp_stream_reset_request * 3602 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk) 3603 { 3604 struct sctp_association *asoc; 3605 struct sctp_chunkhdr *ch; 3606 struct sctp_stream_reset_request *r; 3607 struct sctp_tmit_chunk *chk; 3608 int len, clen; 3609 3610 asoc = &stcb->asoc; 3611 if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 3612 asoc->stream_reset_outstanding = 0; 3613 return (NULL); 3614 } 3615 if (stcb->asoc.str_reset == NULL) { 3616 asoc->stream_reset_outstanding = 0; 3617 return (NULL); 3618 } 3619 chk = stcb->asoc.str_reset; 3620 if (chk->data == NULL) { 3621 return (NULL); 3622 } 3623 if (bchk) { 3624 /* he wants a copy of the chk pointer */ 3625 *bchk = chk; 3626 } 3627 clen = chk->send_size; 3628 ch = mtod(chk->data, struct sctp_chunkhdr *); 3629 r = (struct sctp_stream_reset_request *)(ch + 1); 3630 if (ntohl(r->request_seq) == seq) { 3631 /* found it */ 3632 return (r); 3633 } 3634 len = SCTP_SIZE32(ntohs(r->ph.param_length)); 3635 if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) { 3636 /* move to the next one, there can only be a max of two */ 3637 r = (struct sctp_stream_reset_request *)((caddr_t)r + len); 3638 if (ntohl(r->request_seq) == seq) { 3639 return (r); 3640 } 3641 } 3642 /* that seq is not here */ 3643 return (NULL); 3644 } 3645 3646 static void 3647 sctp_clean_up_stream_reset(struct sctp_tcb *stcb) 3648 { 3649 struct sctp_association *asoc; 3650 struct sctp_tmit_chunk *chk; 3651 3652 asoc = &stcb->asoc; 3653 chk = asoc->str_reset; 3654 if (chk == NULL) { 3655 return; 3656 } 3657 asoc->str_reset = NULL; 3658 sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, 3659 chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_28); 3660 TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next); 3661 asoc->ctrl_queue_cnt--; 3662 if (chk->data) { 3663 sctp_m_freem(chk->data); 3664 chk->data = NULL; 3665 } 3666 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3667 } 3668 3669 3670 static int 3671 sctp_handle_stream_reset_response(struct sctp_tcb *stcb, 3672 uint32_t seq, uint32_t action, 3673 struct sctp_stream_reset_response *respin) 3674 { 3675 uint16_t type; 3676 int lparam_len; 3677 struct sctp_association *asoc = &stcb->asoc; 3678 struct sctp_tmit_chunk *chk; 3679 struct sctp_stream_reset_request *req_param; 3680 struct sctp_stream_reset_out_request *req_out_param; 3681 struct sctp_stream_reset_in_request *req_in_param; 3682 uint32_t number_entries; 3683 3684 if (asoc->stream_reset_outstanding == 0) { 3685 /* duplicate */ 3686 return (0); 3687 } 3688 if (seq == stcb->asoc.str_reset_seq_out) { 3689 req_param = sctp_find_stream_reset(stcb, seq, &chk); 3690 if (req_param != NULL) { 3691 stcb->asoc.str_reset_seq_out++; 3692 type = ntohs(req_param->ph.param_type); 3693 lparam_len = ntohs(req_param->ph.param_length); 3694 if (type == SCTP_STR_RESET_OUT_REQUEST) { 3695 int no_clear = 0; 3696 3697 req_out_param = (struct sctp_stream_reset_out_request *)req_param; 3698 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t); 3699 asoc->stream_reset_out_is_outstanding = 0; 3700 if (asoc->stream_reset_outstanding) 3701 asoc->stream_reset_outstanding--; 3702 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3703 /* do it */ 3704 sctp_reset_out_streams(stcb, number_entries, req_out_param->list_of_streams); 3705 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3706 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3707 } else if (action == SCTP_STREAM_RESET_RESULT_IN_PROGRESS) { 3708 /* 3709 * Set it up so we don't stop 3710 * retransmitting 3711 */ 3712 asoc->stream_reset_outstanding++; 3713 stcb->asoc.str_reset_seq_out--; 3714 asoc->stream_reset_out_is_outstanding = 1; 3715 no_clear = 1; 3716 } else { 3717 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3718 } 3719 if (no_clear == 0) { 3720 sctp_reset_clear_pending(stcb, number_entries, req_out_param->list_of_streams); 3721 } 3722 } else if (type == SCTP_STR_RESET_IN_REQUEST) { 3723 req_in_param = (struct sctp_stream_reset_in_request *)req_param; 3724 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t); 3725 if (asoc->stream_reset_outstanding) 3726 asoc->stream_reset_outstanding--; 3727 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3728 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb, 3729 number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3730 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3731 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb, 3732 number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3733 } 3734 } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) { 3735 /* Ok we now may have more streams */ 3736 int num_stream; 3737 3738 num_stream = stcb->asoc.strm_pending_add_size; 3739 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) { 3740 /* TSNH */ 3741 num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt; 3742 } 3743 stcb->asoc.strm_pending_add_size = 0; 3744 if (asoc->stream_reset_outstanding) 3745 asoc->stream_reset_outstanding--; 3746 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3747 /* Put the new streams into effect */ 3748 int i; 3749 3750 for (i = asoc->streamoutcnt; i < (asoc->streamoutcnt + num_stream); i++) { 3751 asoc->strmout[i].state = SCTP_STREAM_OPEN; 3752 } 3753 asoc->streamoutcnt += num_stream; 3754 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 3755 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3756 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3757 SCTP_STREAM_CHANGE_DENIED); 3758 } else { 3759 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3760 SCTP_STREAM_CHANGE_FAILED); 3761 } 3762 } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) { 3763 if (asoc->stream_reset_outstanding) 3764 asoc->stream_reset_outstanding--; 3765 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3766 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3767 SCTP_STREAM_CHANGE_DENIED); 3768 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3769 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3770 SCTP_STREAM_CHANGE_FAILED); 3771 } 3772 } else if (type == SCTP_STR_RESET_TSN_REQUEST) { 3773 /** 3774 * a) Adopt the new in tsn. 3775 * b) reset the map 3776 * c) Adopt the new out-tsn 3777 */ 3778 struct sctp_stream_reset_response_tsn *resp; 3779 struct sctp_forward_tsn_chunk fwdtsn; 3780 int abort_flag = 0; 3781 3782 if (respin == NULL) { 3783 /* huh ? */ 3784 return (0); 3785 } 3786 if (ntohs(respin->ph.param_length) < sizeof(struct sctp_stream_reset_response_tsn)) { 3787 return (0); 3788 } 3789 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3790 resp = (struct sctp_stream_reset_response_tsn *)respin; 3791 asoc->stream_reset_outstanding--; 3792 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3793 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3794 fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1); 3795 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3796 if (abort_flag) { 3797 return (1); 3798 } 3799 stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1); 3800 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3801 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3802 } 3803 3804 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 3805 stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn); 3806 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 3807 3808 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map; 3809 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size); 3810 3811 stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn); 3812 stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn; 3813 3814 sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL); 3815 sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL); 3816 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0); 3817 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3818 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3819 SCTP_ASSOC_RESET_DENIED); 3820 } else { 3821 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3822 SCTP_ASSOC_RESET_FAILED); 3823 } 3824 } 3825 /* get rid of the request and get the request flags */ 3826 if (asoc->stream_reset_outstanding == 0) { 3827 sctp_clean_up_stream_reset(stcb); 3828 } 3829 } 3830 } 3831 if (asoc->stream_reset_outstanding == 0) { 3832 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED); 3833 } 3834 return (0); 3835 } 3836 3837 static void 3838 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb, 3839 struct sctp_tmit_chunk *chk, 3840 struct sctp_stream_reset_in_request *req, int trunc) 3841 { 3842 uint32_t seq; 3843 int len, i; 3844 int number_entries; 3845 uint16_t temp; 3846 3847 /* 3848 * peer wants me to send a str-reset to him for my outgoing seq's if 3849 * seq_in is right. 3850 */ 3851 struct sctp_association *asoc = &stcb->asoc; 3852 3853 seq = ntohl(req->request_seq); 3854 if (asoc->str_reset_seq_in == seq) { 3855 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3856 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3857 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3858 } else if (trunc) { 3859 /* Can't do it, since they exceeded our buffer size */ 3860 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3861 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) { 3862 len = ntohs(req->ph.param_length); 3863 number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t)); 3864 if (number_entries) { 3865 for (i = 0; i < number_entries; i++) { 3866 temp = ntohs(req->list_of_streams[i]); 3867 if (temp >= stcb->asoc.streamoutcnt) { 3868 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3869 goto bad_boy; 3870 } 3871 req->list_of_streams[i] = temp; 3872 } 3873 for (i = 0; i < number_entries; i++) { 3874 if (stcb->asoc.strmout[req->list_of_streams[i]].state == SCTP_STREAM_OPEN) { 3875 stcb->asoc.strmout[req->list_of_streams[i]].state = SCTP_STREAM_RESET_PENDING; 3876 } 3877 } 3878 } else { 3879 /* Its all */ 3880 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3881 if (stcb->asoc.strmout[i].state == SCTP_STREAM_OPEN) 3882 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_PENDING; 3883 } 3884 } 3885 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3886 } else { 3887 /* Can't do it, since we have sent one out */ 3888 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 3889 } 3890 bad_boy: 3891 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3892 asoc->str_reset_seq_in++; 3893 } else if (asoc->str_reset_seq_in - 1 == seq) { 3894 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3895 } else if (asoc->str_reset_seq_in - 2 == seq) { 3896 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3897 } else { 3898 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3899 } 3900 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED); 3901 } 3902 3903 static int 3904 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb, 3905 struct sctp_tmit_chunk *chk, 3906 struct sctp_stream_reset_tsn_request *req) 3907 { 3908 /* reset all in and out and update the tsn */ 3909 /* 3910 * A) reset my str-seq's on in and out. B) Select a receive next, 3911 * and set cum-ack to it. Also process this selected number as a 3912 * fwd-tsn as well. C) set in the response my next sending seq. 3913 */ 3914 struct sctp_forward_tsn_chunk fwdtsn; 3915 struct sctp_association *asoc = &stcb->asoc; 3916 int abort_flag = 0; 3917 uint32_t seq; 3918 3919 seq = ntohl(req->request_seq); 3920 if (asoc->str_reset_seq_in == seq) { 3921 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3922 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 3923 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3924 } else { 3925 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3926 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3927 fwdtsn.ch.chunk_flags = 0; 3928 fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1); 3929 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3930 if (abort_flag) { 3931 return (1); 3932 } 3933 asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA; 3934 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3935 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3936 } 3937 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map; 3938 asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1; 3939 memset(asoc->mapping_array, 0, asoc->mapping_array_size); 3940 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 3941 memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size); 3942 atomic_add_int(&asoc->sending_seq, 1); 3943 /* save off historical data for retrans */ 3944 asoc->last_sending_seq[1] = asoc->last_sending_seq[0]; 3945 asoc->last_sending_seq[0] = asoc->sending_seq; 3946 asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0]; 3947 asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn; 3948 sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL); 3949 sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL); 3950 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3951 sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0); 3952 } 3953 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3954 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3955 asoc->str_reset_seq_in++; 3956 } else if (asoc->str_reset_seq_in - 1 == seq) { 3957 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3958 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3959 } else if (asoc->str_reset_seq_in - 2 == seq) { 3960 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1], 3961 asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]); 3962 } else { 3963 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3964 } 3965 return (0); 3966 } 3967 3968 static void 3969 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb, 3970 struct sctp_tmit_chunk *chk, 3971 struct sctp_stream_reset_out_request *req, int trunc) 3972 { 3973 uint32_t seq, tsn; 3974 int number_entries, len; 3975 struct sctp_association *asoc = &stcb->asoc; 3976 3977 seq = ntohl(req->request_seq); 3978 3979 /* now if its not a duplicate we process it */ 3980 if (asoc->str_reset_seq_in == seq) { 3981 len = ntohs(req->ph.param_length); 3982 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t)); 3983 /* 3984 * the sender is resetting, handle the list issue.. we must 3985 * a) verify if we can do the reset, if so no problem b) If 3986 * we can't do the reset we must copy the request. c) queue 3987 * it, and setup the data in processor to trigger it off 3988 * when needed and dequeue all the queued data. 3989 */ 3990 tsn = ntohl(req->send_reset_at_tsn); 3991 3992 /* move the reset action back one */ 3993 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3994 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3995 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3996 } else if (trunc) { 3997 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3998 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) { 3999 /* we can do it now */ 4000 sctp_reset_in_stream(stcb, number_entries, req->list_of_streams); 4001 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 4002 } else { 4003 /* 4004 * we must queue it up and thus wait for the TSN's 4005 * to arrive that are at or before tsn 4006 */ 4007 struct sctp_stream_reset_list *liste; 4008 int siz; 4009 4010 siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t)); 4011 SCTP_MALLOC(liste, struct sctp_stream_reset_list *, 4012 siz, SCTP_M_STRESET); 4013 if (liste == NULL) { 4014 /* gak out of memory */ 4015 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4016 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4017 return; 4018 } 4019 liste->seq = seq; 4020 liste->tsn = tsn; 4021 liste->number_entries = number_entries; 4022 memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t)); 4023 TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp); 4024 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_IN_PROGRESS; 4025 } 4026 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4027 asoc->str_reset_seq_in++; 4028 } else if ((asoc->str_reset_seq_in - 1) == seq) { 4029 /* 4030 * one seq back, just echo back last action since my 4031 * response was lost. 4032 */ 4033 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4034 } else if ((asoc->str_reset_seq_in - 2) == seq) { 4035 /* 4036 * two seq back, just echo back last action since my 4037 * response was lost. 4038 */ 4039 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 4040 } else { 4041 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 4042 } 4043 } 4044 4045 static void 4046 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 4047 struct sctp_stream_reset_add_strm *str_add) 4048 { 4049 /* 4050 * Peer is requesting to add more streams. If its within our 4051 * max-streams we will allow it. 4052 */ 4053 uint32_t num_stream, i; 4054 uint32_t seq; 4055 struct sctp_association *asoc = &stcb->asoc; 4056 struct sctp_queued_to_read *ctl, *nctl; 4057 4058 /* Get the number. */ 4059 seq = ntohl(str_add->request_seq); 4060 num_stream = ntohs(str_add->number_of_streams); 4061 /* Now what would be the new total? */ 4062 if (asoc->str_reset_seq_in == seq) { 4063 num_stream += stcb->asoc.streamincnt; 4064 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 4065 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 4066 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4067 } else if ((num_stream > stcb->asoc.max_inbound_streams) || 4068 (num_stream > 0xffff)) { 4069 /* We must reject it they ask for to many */ 4070 denied: 4071 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4072 } else { 4073 /* Ok, we can do that :-) */ 4074 struct sctp_stream_in *oldstrm; 4075 4076 /* save off the old */ 4077 oldstrm = stcb->asoc.strmin; 4078 SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *, 4079 (num_stream * sizeof(struct sctp_stream_in)), 4080 SCTP_M_STRMI); 4081 if (stcb->asoc.strmin == NULL) { 4082 stcb->asoc.strmin = oldstrm; 4083 goto denied; 4084 } 4085 /* copy off the old data */ 4086 for (i = 0; i < stcb->asoc.streamincnt; i++) { 4087 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 4088 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue); 4089 stcb->asoc.strmin[i].sid = i; 4090 stcb->asoc.strmin[i].last_mid_delivered = oldstrm[i].last_mid_delivered; 4091 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started; 4092 stcb->asoc.strmin[i].pd_api_started = oldstrm[i].pd_api_started; 4093 /* now anything on those queues? */ 4094 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next_instrm, nctl) { 4095 TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next_instrm); 4096 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next_instrm); 4097 } 4098 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].uno_inqueue, next_instrm, nctl) { 4099 TAILQ_REMOVE(&oldstrm[i].uno_inqueue, ctl, next_instrm); 4100 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].uno_inqueue, ctl, next_instrm); 4101 } 4102 } 4103 /* Init the new streams */ 4104 for (i = stcb->asoc.streamincnt; i < num_stream; i++) { 4105 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 4106 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue); 4107 stcb->asoc.strmin[i].sid = i; 4108 stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff; 4109 stcb->asoc.strmin[i].pd_api_started = 0; 4110 stcb->asoc.strmin[i].delivery_started = 0; 4111 } 4112 SCTP_FREE(oldstrm, SCTP_M_STRMI); 4113 /* update the size */ 4114 stcb->asoc.streamincnt = num_stream; 4115 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 4116 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 4117 } 4118 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4119 asoc->str_reset_seq_in++; 4120 } else if ((asoc->str_reset_seq_in - 1) == seq) { 4121 /* 4122 * one seq back, just echo back last action since my 4123 * response was lost. 4124 */ 4125 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4126 } else if ((asoc->str_reset_seq_in - 2) == seq) { 4127 /* 4128 * two seq back, just echo back last action since my 4129 * response was lost. 4130 */ 4131 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 4132 } else { 4133 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 4134 4135 } 4136 } 4137 4138 static void 4139 sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 4140 struct sctp_stream_reset_add_strm *str_add) 4141 { 4142 /* 4143 * Peer is requesting to add more streams. If its within our 4144 * max-streams we will allow it. 4145 */ 4146 uint16_t num_stream; 4147 uint32_t seq; 4148 struct sctp_association *asoc = &stcb->asoc; 4149 4150 /* Get the number. */ 4151 seq = ntohl(str_add->request_seq); 4152 num_stream = ntohs(str_add->number_of_streams); 4153 /* Now what would be the new total? */ 4154 if (asoc->str_reset_seq_in == seq) { 4155 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 4156 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 4157 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4158 } else if (stcb->asoc.stream_reset_outstanding) { 4159 /* We must reject it we have something pending */ 4160 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 4161 } else { 4162 /* Ok, we can do that :-) */ 4163 int mychk; 4164 4165 mychk = stcb->asoc.streamoutcnt; 4166 mychk += num_stream; 4167 if (mychk < 0x10000) { 4168 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 4169 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 1, num_stream, 0, 1)) { 4170 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4171 } 4172 } else { 4173 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4174 } 4175 } 4176 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]); 4177 asoc->str_reset_seq_in++; 4178 } else if ((asoc->str_reset_seq_in - 1) == seq) { 4179 /* 4180 * one seq back, just echo back last action since my 4181 * response was lost. 4182 */ 4183 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4184 } else if ((asoc->str_reset_seq_in - 2) == seq) { 4185 /* 4186 * two seq back, just echo back last action since my 4187 * response was lost. 4188 */ 4189 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 4190 } else { 4191 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 4192 } 4193 } 4194 4195 #ifdef __GNUC__ 4196 __attribute__((noinline)) 4197 #endif 4198 static int 4199 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset, 4200 struct sctp_chunkhdr *ch_req) 4201 { 4202 uint16_t remaining_length, param_len, ptype; 4203 struct sctp_paramhdr pstore; 4204 uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE]; 4205 uint32_t seq = 0; 4206 int num_req = 0; 4207 int trunc = 0; 4208 struct sctp_tmit_chunk *chk; 4209 struct sctp_chunkhdr *ch; 4210 struct sctp_paramhdr *ph; 4211 int ret_code = 0; 4212 int num_param = 0; 4213 4214 /* now it may be a reset or a reset-response */ 4215 remaining_length = ntohs(ch_req->chunk_length) - sizeof(struct sctp_chunkhdr); 4216 4217 /* setup for adding the response */ 4218 sctp_alloc_a_chunk(stcb, chk); 4219 if (chk == NULL) { 4220 return (ret_code); 4221 } 4222 chk->copy_by_ref = 0; 4223 chk->rec.chunk_id.id = SCTP_STREAM_RESET; 4224 chk->rec.chunk_id.can_take_data = 0; 4225 chk->flags = 0; 4226 chk->asoc = &stcb->asoc; 4227 chk->no_fr_allowed = 0; 4228 chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr); 4229 chk->book_size_scale = 0; 4230 chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA); 4231 if (chk->data == NULL) { 4232 strres_nochunk: 4233 if (chk->data) { 4234 sctp_m_freem(chk->data); 4235 chk->data = NULL; 4236 } 4237 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 4238 return (ret_code); 4239 } 4240 SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD); 4241 4242 /* setup chunk parameters */ 4243 chk->sent = SCTP_DATAGRAM_UNSENT; 4244 chk->snd_count = 0; 4245 chk->whoTo = NULL; 4246 4247 ch = mtod(chk->data, struct sctp_chunkhdr *); 4248 ch->chunk_type = SCTP_STREAM_RESET; 4249 ch->chunk_flags = 0; 4250 ch->chunk_length = htons(chk->send_size); 4251 SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size); 4252 offset += sizeof(struct sctp_chunkhdr); 4253 while (remaining_length >= sizeof(struct sctp_paramhdr)) { 4254 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *)&pstore); 4255 if (ph == NULL) { 4256 /* TSNH */ 4257 break; 4258 } 4259 param_len = ntohs(ph->param_length); 4260 if ((param_len > remaining_length) || 4261 (param_len < (sizeof(struct sctp_paramhdr) + sizeof(uint32_t)))) { 4262 /* bad parameter length */ 4263 break; 4264 } 4265 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, sizeof(cstore)), 4266 (uint8_t *)&cstore); 4267 if (ph == NULL) { 4268 /* TSNH */ 4269 break; 4270 } 4271 ptype = ntohs(ph->param_type); 4272 num_param++; 4273 if (param_len > sizeof(cstore)) { 4274 trunc = 1; 4275 } else { 4276 trunc = 0; 4277 } 4278 if (num_param > SCTP_MAX_RESET_PARAMS) { 4279 /* hit the max of parameters already sorry.. */ 4280 break; 4281 } 4282 if (ptype == SCTP_STR_RESET_OUT_REQUEST) { 4283 struct sctp_stream_reset_out_request *req_out; 4284 4285 if (param_len < sizeof(struct sctp_stream_reset_out_request)) { 4286 break; 4287 } 4288 req_out = (struct sctp_stream_reset_out_request *)ph; 4289 num_req++; 4290 if (stcb->asoc.stream_reset_outstanding) { 4291 seq = ntohl(req_out->response_seq); 4292 if (seq == stcb->asoc.str_reset_seq_out) { 4293 /* implicit ack */ 4294 (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL); 4295 } 4296 } 4297 sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc); 4298 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) { 4299 struct sctp_stream_reset_add_strm *str_add; 4300 4301 if (param_len < sizeof(struct sctp_stream_reset_add_strm)) { 4302 break; 4303 } 4304 str_add = (struct sctp_stream_reset_add_strm *)ph; 4305 num_req++; 4306 sctp_handle_str_reset_add_strm(stcb, chk, str_add); 4307 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) { 4308 struct sctp_stream_reset_add_strm *str_add; 4309 4310 if (param_len < sizeof(struct sctp_stream_reset_add_strm)) { 4311 break; 4312 } 4313 str_add = (struct sctp_stream_reset_add_strm *)ph; 4314 num_req++; 4315 sctp_handle_str_reset_add_out_strm(stcb, chk, str_add); 4316 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) { 4317 struct sctp_stream_reset_in_request *req_in; 4318 4319 num_req++; 4320 req_in = (struct sctp_stream_reset_in_request *)ph; 4321 sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc); 4322 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) { 4323 struct sctp_stream_reset_tsn_request *req_tsn; 4324 4325 num_req++; 4326 req_tsn = (struct sctp_stream_reset_tsn_request *)ph; 4327 if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) { 4328 ret_code = 1; 4329 goto strres_nochunk; 4330 } 4331 /* no more */ 4332 break; 4333 } else if (ptype == SCTP_STR_RESET_RESPONSE) { 4334 struct sctp_stream_reset_response *resp; 4335 uint32_t result; 4336 4337 if (param_len < sizeof(struct sctp_stream_reset_response)) { 4338 break; 4339 } 4340 resp = (struct sctp_stream_reset_response *)ph; 4341 seq = ntohl(resp->response_seq); 4342 result = ntohl(resp->result); 4343 if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) { 4344 ret_code = 1; 4345 goto strres_nochunk; 4346 } 4347 } else { 4348 break; 4349 } 4350 offset += SCTP_SIZE32(param_len); 4351 if (remaining_length >= SCTP_SIZE32(param_len)) { 4352 remaining_length -= SCTP_SIZE32(param_len); 4353 } else { 4354 remaining_length = 0; 4355 } 4356 } 4357 if (num_req == 0) { 4358 /* we have no response free the stuff */ 4359 goto strres_nochunk; 4360 } 4361 /* ok we have a chunk to link in */ 4362 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, 4363 chk, 4364 sctp_next); 4365 stcb->asoc.ctrl_queue_cnt++; 4366 return (ret_code); 4367 } 4368 4369 /* 4370 * Handle a router or endpoints report of a packet loss, there are two ways 4371 * to handle this, either we get the whole packet and must disect it 4372 * ourselves (possibly with truncation and or corruption) or it is a summary 4373 * from a middle box that did the disectting for us. 4374 */ 4375 static void 4376 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp, 4377 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 4378 { 4379 uint32_t bottle_bw, on_queue; 4380 uint16_t trunc_len; 4381 unsigned int chlen; 4382 unsigned int at; 4383 struct sctp_chunk_desc desc; 4384 struct sctp_chunkhdr *ch; 4385 4386 chlen = ntohs(cp->ch.chunk_length); 4387 chlen -= sizeof(struct sctp_pktdrop_chunk); 4388 /* XXX possible chlen underflow */ 4389 if (chlen == 0) { 4390 ch = NULL; 4391 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) 4392 SCTP_STAT_INCR(sctps_pdrpbwrpt); 4393 } else { 4394 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr)); 4395 chlen -= sizeof(struct sctphdr); 4396 /* XXX possible chlen underflow */ 4397 memset(&desc, 0, sizeof(desc)); 4398 } 4399 trunc_len = (uint16_t)ntohs(cp->trunc_len); 4400 if (trunc_len > limit) { 4401 trunc_len = limit; 4402 } 4403 4404 /* now the chunks themselves */ 4405 while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) { 4406 desc.chunk_type = ch->chunk_type; 4407 /* get amount we need to move */ 4408 at = ntohs(ch->chunk_length); 4409 if (at < sizeof(struct sctp_chunkhdr)) { 4410 /* corrupt chunk, maybe at the end? */ 4411 SCTP_STAT_INCR(sctps_pdrpcrupt); 4412 break; 4413 } 4414 if (trunc_len == 0) { 4415 /* we are supposed to have all of it */ 4416 if (at > chlen) { 4417 /* corrupt skip it */ 4418 SCTP_STAT_INCR(sctps_pdrpcrupt); 4419 break; 4420 } 4421 } else { 4422 /* is there enough of it left ? */ 4423 if (desc.chunk_type == SCTP_DATA) { 4424 if (chlen < (sizeof(struct sctp_data_chunk) + 4425 sizeof(desc.data_bytes))) { 4426 break; 4427 } 4428 } else { 4429 if (chlen < sizeof(struct sctp_chunkhdr)) { 4430 break; 4431 } 4432 } 4433 } 4434 if (desc.chunk_type == SCTP_DATA) { 4435 /* can we get out the tsn? */ 4436 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4437 SCTP_STAT_INCR(sctps_pdrpmbda); 4438 4439 if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) { 4440 /* yep */ 4441 struct sctp_data_chunk *dcp; 4442 uint8_t *ddp; 4443 unsigned int iii; 4444 4445 dcp = (struct sctp_data_chunk *)ch; 4446 ddp = (uint8_t *)(dcp + 1); 4447 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) { 4448 desc.data_bytes[iii] = ddp[iii]; 4449 } 4450 desc.tsn_ifany = dcp->dp.tsn; 4451 } else { 4452 /* nope we are done. */ 4453 SCTP_STAT_INCR(sctps_pdrpnedat); 4454 break; 4455 } 4456 } else { 4457 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4458 SCTP_STAT_INCR(sctps_pdrpmbct); 4459 } 4460 4461 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) { 4462 SCTP_STAT_INCR(sctps_pdrppdbrk); 4463 break; 4464 } 4465 if (SCTP_SIZE32(at) > chlen) { 4466 break; 4467 } 4468 chlen -= SCTP_SIZE32(at); 4469 if (chlen < sizeof(struct sctp_chunkhdr)) { 4470 /* done, none left */ 4471 break; 4472 } 4473 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at)); 4474 } 4475 /* Now update any rwnd --- possibly */ 4476 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) { 4477 /* From a peer, we get a rwnd report */ 4478 uint32_t a_rwnd; 4479 4480 SCTP_STAT_INCR(sctps_pdrpfehos); 4481 4482 bottle_bw = ntohl(cp->bottle_bw); 4483 on_queue = ntohl(cp->current_onq); 4484 if (bottle_bw && on_queue) { 4485 /* a rwnd report is in here */ 4486 if (bottle_bw > on_queue) 4487 a_rwnd = bottle_bw - on_queue; 4488 else 4489 a_rwnd = 0; 4490 4491 if (a_rwnd == 0) 4492 stcb->asoc.peers_rwnd = 0; 4493 else { 4494 if (a_rwnd > stcb->asoc.total_flight) { 4495 stcb->asoc.peers_rwnd = 4496 a_rwnd - stcb->asoc.total_flight; 4497 } else { 4498 stcb->asoc.peers_rwnd = 0; 4499 } 4500 if (stcb->asoc.peers_rwnd < 4501 stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 4502 /* SWS sender side engages */ 4503 stcb->asoc.peers_rwnd = 0; 4504 } 4505 } 4506 } 4507 } else { 4508 SCTP_STAT_INCR(sctps_pdrpfmbox); 4509 } 4510 4511 /* now middle boxes in sat networks get a cwnd bump */ 4512 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) && 4513 (stcb->asoc.sat_t3_loss_recovery == 0) && 4514 (stcb->asoc.sat_network)) { 4515 /* 4516 * This is debatable but for sat networks it makes sense 4517 * Note if a T3 timer has went off, we will prohibit any 4518 * changes to cwnd until we exit the t3 loss recovery. 4519 */ 4520 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb, 4521 net, cp, &bottle_bw, &on_queue); 4522 } 4523 } 4524 4525 /* 4526 * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to 4527 * still contain IP/SCTP header - stcb: is the tcb found for this packet - 4528 * offset: offset into the mbuf chain to first chunkhdr - length: is the 4529 * length of the complete packet outputs: - length: modified to remaining 4530 * length after control processing - netp: modified to new sctp_nets after 4531 * cookie-echo processing - return NULL to discard the packet (ie. no asoc, 4532 * bad packet,...) otherwise return the tcb for this packet 4533 */ 4534 #ifdef __GNUC__ 4535 __attribute__((noinline)) 4536 #endif 4537 static struct sctp_tcb * 4538 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length, 4539 struct sockaddr *src, struct sockaddr *dst, 4540 struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp, 4541 struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen, 4542 uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum, 4543 uint32_t vrf_id, uint16_t port) 4544 { 4545 struct sctp_association *asoc; 4546 struct mbuf *op_err; 4547 char msg[SCTP_DIAG_INFO_LEN]; 4548 uint32_t vtag_in; 4549 int num_chunks = 0; /* number of control chunks processed */ 4550 uint32_t chk_length, contiguous; 4551 int ret; 4552 int abort_no_unlock = 0; 4553 int ecne_seen = 0; 4554 4555 /* 4556 * How big should this be, and should it be alloc'd? Lets try the 4557 * d-mtu-ceiling for now (2k) and that should hopefully work ... 4558 * until we get into jumbo grams and such.. 4559 */ 4560 uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE]; 4561 int got_auth = 0; 4562 uint32_t auth_offset = 0, auth_len = 0; 4563 int auth_skipped = 0; 4564 int asconf_cnt = 0; 4565 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4566 struct socket *so; 4567 #endif 4568 4569 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n", 4570 iphlen, *offset, length, (void *)stcb); 4571 4572 if (stcb) { 4573 SCTP_TCB_LOCK_ASSERT(stcb); 4574 } 4575 /* validate chunk header length... */ 4576 if (ntohs(ch->chunk_length) < sizeof(*ch)) { 4577 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n", 4578 ntohs(ch->chunk_length)); 4579 *offset = length; 4580 return (stcb); 4581 } 4582 /* 4583 * validate the verification tag 4584 */ 4585 vtag_in = ntohl(sh->v_tag); 4586 4587 if (ch->chunk_type == SCTP_INITIATION) { 4588 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n", 4589 ntohs(ch->chunk_length), vtag_in); 4590 if (vtag_in != 0) { 4591 /* protocol error- silently discard... */ 4592 SCTP_STAT_INCR(sctps_badvtag); 4593 if (stcb != NULL) { 4594 SCTP_TCB_UNLOCK(stcb); 4595 } 4596 return (NULL); 4597 } 4598 } else if (ch->chunk_type != SCTP_COOKIE_ECHO) { 4599 /* 4600 * If there is no stcb, skip the AUTH chunk and process 4601 * later after a stcb is found (to validate the lookup was 4602 * valid. 4603 */ 4604 if ((ch->chunk_type == SCTP_AUTHENTICATION) && 4605 (stcb == NULL) && 4606 (inp->auth_supported == 1)) { 4607 /* save this chunk for later processing */ 4608 auth_skipped = 1; 4609 auth_offset = *offset; 4610 auth_len = ntohs(ch->chunk_length); 4611 4612 /* (temporarily) move past this chunk */ 4613 *offset += SCTP_SIZE32(auth_len); 4614 if (*offset >= length) { 4615 /* no more data left in the mbuf chain */ 4616 *offset = length; 4617 return (NULL); 4618 } 4619 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4620 sizeof(struct sctp_chunkhdr), chunk_buf); 4621 } 4622 if (ch == NULL) { 4623 /* Help */ 4624 *offset = length; 4625 return (stcb); 4626 } 4627 if (ch->chunk_type == SCTP_COOKIE_ECHO) { 4628 goto process_control_chunks; 4629 } 4630 /* 4631 * first check if it's an ASCONF with an unknown src addr we 4632 * need to look inside to find the association 4633 */ 4634 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) { 4635 struct sctp_chunkhdr *asconf_ch = ch; 4636 uint32_t asconf_offset = 0, asconf_len = 0; 4637 4638 /* inp's refcount may be reduced */ 4639 SCTP_INP_INCR_REF(inp); 4640 4641 asconf_offset = *offset; 4642 do { 4643 asconf_len = ntohs(asconf_ch->chunk_length); 4644 if (asconf_len < sizeof(struct sctp_asconf_paramhdr)) 4645 break; 4646 stcb = sctp_findassociation_ep_asconf(m, 4647 *offset, 4648 dst, 4649 sh, &inp, netp, vrf_id); 4650 if (stcb != NULL) 4651 break; 4652 asconf_offset += SCTP_SIZE32(asconf_len); 4653 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset, 4654 sizeof(struct sctp_chunkhdr), chunk_buf); 4655 } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF); 4656 if (stcb == NULL) { 4657 /* 4658 * reduce inp's refcount if not reduced in 4659 * sctp_findassociation_ep_asconf(). 4660 */ 4661 SCTP_INP_DECR_REF(inp); 4662 } 4663 4664 /* now go back and verify any auth chunk to be sure */ 4665 if (auth_skipped && (stcb != NULL)) { 4666 struct sctp_auth_chunk *auth; 4667 4668 auth = (struct sctp_auth_chunk *) 4669 sctp_m_getptr(m, auth_offset, 4670 auth_len, chunk_buf); 4671 got_auth = 1; 4672 auth_skipped = 0; 4673 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, 4674 auth_offset)) { 4675 /* auth HMAC failed so dump it */ 4676 *offset = length; 4677 return (stcb); 4678 } else { 4679 /* remaining chunks are HMAC checked */ 4680 stcb->asoc.authenticated = 1; 4681 } 4682 } 4683 } 4684 if (stcb == NULL) { 4685 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 4686 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4687 msg); 4688 /* no association, so it's out of the blue... */ 4689 sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, op_err, 4690 mflowtype, mflowid, inp->fibnum, 4691 vrf_id, port); 4692 *offset = length; 4693 return (NULL); 4694 } 4695 asoc = &stcb->asoc; 4696 /* ABORT and SHUTDOWN can use either v_tag... */ 4697 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) || 4698 (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) || 4699 (ch->chunk_type == SCTP_PACKET_DROPPED)) { 4700 /* Take the T-bit always into account. */ 4701 if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) && 4702 (vtag_in == asoc->my_vtag)) || 4703 (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) && 4704 (asoc->peer_vtag != htonl(0)) && 4705 (vtag_in == asoc->peer_vtag))) { 4706 /* this is valid */ 4707 } else { 4708 /* drop this packet... */ 4709 SCTP_STAT_INCR(sctps_badvtag); 4710 if (stcb != NULL) { 4711 SCTP_TCB_UNLOCK(stcb); 4712 } 4713 return (NULL); 4714 } 4715 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 4716 if (vtag_in != asoc->my_vtag) { 4717 /* 4718 * this could be a stale SHUTDOWN-ACK or the 4719 * peer never got the SHUTDOWN-COMPLETE and 4720 * is still hung; we have started a new asoc 4721 * but it won't complete until the shutdown 4722 * is completed 4723 */ 4724 if (stcb != NULL) { 4725 SCTP_TCB_UNLOCK(stcb); 4726 } 4727 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 4728 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4729 msg); 4730 sctp_handle_ootb(m, iphlen, *offset, src, dst, 4731 sh, inp, op_err, 4732 mflowtype, mflowid, fibnum, 4733 vrf_id, port); 4734 return (NULL); 4735 } 4736 } else { 4737 /* for all other chunks, vtag must match */ 4738 if (vtag_in != asoc->my_vtag) { 4739 /* invalid vtag... */ 4740 SCTPDBG(SCTP_DEBUG_INPUT3, 4741 "invalid vtag: %xh, expect %xh\n", 4742 vtag_in, asoc->my_vtag); 4743 SCTP_STAT_INCR(sctps_badvtag); 4744 if (stcb != NULL) { 4745 SCTP_TCB_UNLOCK(stcb); 4746 } 4747 *offset = length; 4748 return (NULL); 4749 } 4750 } 4751 } /* end if !SCTP_COOKIE_ECHO */ 4752 /* 4753 * process all control chunks... 4754 */ 4755 if (((ch->chunk_type == SCTP_SELECTIVE_ACK) || 4756 (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) || 4757 (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) && 4758 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 4759 /* implied cookie-ack.. we must have lost the ack */ 4760 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, 4761 *netp); 4762 } 4763 4764 process_control_chunks: 4765 while (IS_SCTP_CONTROL(ch)) { 4766 /* validate chunk length */ 4767 chk_length = ntohs(ch->chunk_length); 4768 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n", 4769 ch->chunk_type, chk_length); 4770 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length); 4771 if (chk_length < sizeof(*ch) || 4772 (*offset + (int)chk_length) > length) { 4773 *offset = length; 4774 return (stcb); 4775 } 4776 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks); 4777 /* 4778 * INIT and INIT-ACK only gets the init ack "header" portion 4779 * only because we don't have to process the peer's COOKIE. 4780 * All others get a complete chunk. 4781 */ 4782 switch (ch->chunk_type) { 4783 case SCTP_INITIATION: 4784 contiguous = sizeof(struct sctp_init_chunk); 4785 break; 4786 case SCTP_INITIATION_ACK: 4787 contiguous = sizeof(struct sctp_init_ack_chunk); 4788 break; 4789 default: 4790 contiguous = min(chk_length, sizeof(chunk_buf)); 4791 break; 4792 } 4793 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4794 contiguous, 4795 chunk_buf); 4796 if (ch == NULL) { 4797 *offset = length; 4798 if (stcb != NULL) { 4799 SCTP_TCB_UNLOCK(stcb); 4800 } 4801 return (NULL); 4802 } 4803 4804 num_chunks++; 4805 /* Save off the last place we got a control from */ 4806 if (stcb != NULL) { 4807 if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) { 4808 /* 4809 * allow last_control to be NULL if 4810 * ASCONF... ASCONF processing will find the 4811 * right net later 4812 */ 4813 if ((netp != NULL) && (*netp != NULL)) 4814 stcb->asoc.last_control_chunk_from = *netp; 4815 } 4816 } 4817 #ifdef SCTP_AUDITING_ENABLED 4818 sctp_audit_log(0xB0, ch->chunk_type); 4819 #endif 4820 4821 /* check to see if this chunk required auth, but isn't */ 4822 if ((stcb != NULL) && 4823 sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) && 4824 !stcb->asoc.authenticated) { 4825 /* "silently" ignore */ 4826 SCTP_STAT_INCR(sctps_recvauthmissing); 4827 goto next_chunk; 4828 } 4829 switch (ch->chunk_type) { 4830 case SCTP_INITIATION: 4831 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n"); 4832 /* The INIT chunk must be the only chunk. */ 4833 if ((num_chunks > 1) || 4834 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4835 /* RFC 4960 requires that no ABORT is sent */ 4836 *offset = length; 4837 if (stcb != NULL) { 4838 SCTP_TCB_UNLOCK(stcb); 4839 } 4840 return (NULL); 4841 } 4842 /* Honor our resource limit. */ 4843 if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) { 4844 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 4845 sctp_abort_association(inp, stcb, m, iphlen, 4846 src, dst, sh, op_err, 4847 mflowtype, mflowid, 4848 vrf_id, port); 4849 *offset = length; 4850 return (NULL); 4851 } 4852 sctp_handle_init(m, iphlen, *offset, src, dst, sh, 4853 (struct sctp_init_chunk *)ch, inp, 4854 stcb, *netp, &abort_no_unlock, 4855 mflowtype, mflowid, 4856 vrf_id, port); 4857 *offset = length; 4858 if ((!abort_no_unlock) && (stcb != NULL)) { 4859 SCTP_TCB_UNLOCK(stcb); 4860 } 4861 return (NULL); 4862 break; 4863 case SCTP_PAD_CHUNK: 4864 break; 4865 case SCTP_INITIATION_ACK: 4866 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT_ACK\n"); 4867 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4868 /* We are not interested anymore */ 4869 if ((stcb != NULL) && (stcb->asoc.total_output_queue_size)) { 4870 ; 4871 } else { 4872 *offset = length; 4873 if (stcb != NULL) { 4874 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4875 so = SCTP_INP_SO(inp); 4876 atomic_add_int(&stcb->asoc.refcnt, 1); 4877 SCTP_TCB_UNLOCK(stcb); 4878 SCTP_SOCKET_LOCK(so, 1); 4879 SCTP_TCB_LOCK(stcb); 4880 atomic_subtract_int(&stcb->asoc.refcnt, 1); 4881 #endif 4882 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 4883 SCTP_FROM_SCTP_INPUT + SCTP_LOC_29); 4884 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4885 SCTP_SOCKET_UNLOCK(so, 1); 4886 #endif 4887 } 4888 return (NULL); 4889 } 4890 } 4891 /* The INIT-ACK chunk must be the only chunk. */ 4892 if ((num_chunks > 1) || 4893 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4894 *offset = length; 4895 return (stcb); 4896 } 4897 if ((netp != NULL) && (*netp != NULL)) { 4898 ret = sctp_handle_init_ack(m, iphlen, *offset, 4899 src, dst, sh, 4900 (struct sctp_init_ack_chunk *)ch, 4901 stcb, *netp, 4902 &abort_no_unlock, 4903 mflowtype, mflowid, 4904 vrf_id); 4905 } else { 4906 ret = -1; 4907 } 4908 *offset = length; 4909 if (abort_no_unlock) { 4910 return (NULL); 4911 } 4912 /* 4913 * Special case, I must call the output routine to 4914 * get the cookie echoed 4915 */ 4916 if ((stcb != NULL) && (ret == 0)) { 4917 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 4918 } 4919 return (stcb); 4920 break; 4921 case SCTP_SELECTIVE_ACK: 4922 case SCTP_NR_SELECTIVE_ACK: 4923 { 4924 int abort_now = 0; 4925 uint32_t a_rwnd, cum_ack; 4926 uint16_t num_seg, num_nr_seg, num_dup; 4927 uint8_t flags; 4928 int offset_seg, offset_dup; 4929 4930 SCTPDBG(SCTP_DEBUG_INPUT3, "%s\n", 4931 ch->chunk_type == SCTP_SELECTIVE_ACK ? "SCTP_SACK" : "SCTP_NR_SACK"); 4932 SCTP_STAT_INCR(sctps_recvsacks); 4933 if (stcb == NULL) { 4934 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing %s chunk\n", 4935 (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK"); 4936 break; 4937 } 4938 if (ch->chunk_type == SCTP_SELECTIVE_ACK) { 4939 if (chk_length < sizeof(struct sctp_sack_chunk)) { 4940 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n"); 4941 break; 4942 } 4943 } else { 4944 if (stcb->asoc.nrsack_supported == 0) { 4945 goto unknown_chunk; 4946 } 4947 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) { 4948 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR_SACK chunk, too small\n"); 4949 break; 4950 } 4951 } 4952 if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4953 /*- 4954 * If we have sent a shutdown-ack, we will pay no 4955 * attention to a sack sent in to us since 4956 * we don't care anymore. 4957 */ 4958 break; 4959 } 4960 flags = ch->chunk_flags; 4961 if (ch->chunk_type == SCTP_SELECTIVE_ACK) { 4962 struct sctp_sack_chunk *sack; 4963 4964 sack = (struct sctp_sack_chunk *)ch; 4965 cum_ack = ntohl(sack->sack.cum_tsn_ack); 4966 num_seg = ntohs(sack->sack.num_gap_ack_blks); 4967 num_nr_seg = 0; 4968 num_dup = ntohs(sack->sack.num_dup_tsns); 4969 a_rwnd = ntohl(sack->sack.a_rwnd); 4970 if (sizeof(struct sctp_sack_chunk) + 4971 num_seg * sizeof(struct sctp_gap_ack_block) + 4972 num_dup * sizeof(uint32_t) != chk_length) { 4973 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n"); 4974 break; 4975 } 4976 offset_seg = *offset + sizeof(struct sctp_sack_chunk); 4977 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 4978 } else { 4979 struct sctp_nr_sack_chunk *nr_sack; 4980 4981 nr_sack = (struct sctp_nr_sack_chunk *)ch; 4982 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack); 4983 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks); 4984 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks); 4985 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns); 4986 a_rwnd = ntohl(nr_sack->nr_sack.a_rwnd); 4987 if (sizeof(struct sctp_nr_sack_chunk) + 4988 (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) + 4989 num_dup * sizeof(uint32_t) != chk_length) { 4990 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n"); 4991 break; 4992 } 4993 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk); 4994 offset_dup = offset_seg + (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block); 4995 } 4996 SCTPDBG(SCTP_DEBUG_INPUT3, "%s process cum_ack:%x num_seg:%d a_rwnd:%d\n", 4997 (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK", 4998 cum_ack, num_seg, a_rwnd); 4999 stcb->asoc.seen_a_sack_this_pkt = 1; 5000 if ((stcb->asoc.pr_sctp_cnt == 0) && 5001 (num_seg == 0) && (num_nr_seg == 0) && 5002 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 5003 (stcb->asoc.saw_sack_with_frags == 0) && 5004 (stcb->asoc.saw_sack_with_nr_frags == 0) && 5005 (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) { 5006 /* 5007 * We have a SIMPLE sack having no 5008 * prior segments and data on sent 5009 * queue to be acked. Use the faster 5010 * path sack processing. We also 5011 * allow window update sacks with no 5012 * missing segments to go this way 5013 * too. 5014 */ 5015 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, 5016 &abort_now, ecne_seen); 5017 } else { 5018 if ((netp != NULL) && (*netp != NULL)) { 5019 sctp_handle_sack(m, offset_seg, offset_dup, stcb, 5020 num_seg, num_nr_seg, num_dup, &abort_now, flags, 5021 cum_ack, a_rwnd, ecne_seen); 5022 } 5023 } 5024 if (abort_now) { 5025 /* ABORT signal from sack processing */ 5026 *offset = length; 5027 return (NULL); 5028 } 5029 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 5030 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 5031 (stcb->asoc.stream_queue_cnt == 0)) { 5032 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 5033 } 5034 break; 5035 } 5036 case SCTP_HEARTBEAT_REQUEST: 5037 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n"); 5038 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 5039 SCTP_STAT_INCR(sctps_recvheartbeat); 5040 sctp_send_heartbeat_ack(stcb, m, *offset, 5041 chk_length, *netp); 5042 } 5043 break; 5044 case SCTP_HEARTBEAT_ACK: 5045 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT_ACK\n"); 5046 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) { 5047 /* Its not ours */ 5048 *offset = length; 5049 return (stcb); 5050 } 5051 SCTP_STAT_INCR(sctps_recvheartbeatack); 5052 if ((netp != NULL) && (*netp != NULL)) { 5053 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch, 5054 stcb, *netp); 5055 } 5056 break; 5057 case SCTP_ABORT_ASSOCIATION: 5058 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n", 5059 (void *)stcb); 5060 *offset = length; 5061 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 5062 if (sctp_handle_abort((struct sctp_abort_chunk *)ch, stcb, *netp)) { 5063 return (NULL); 5064 } else { 5065 return (stcb); 5066 } 5067 } else { 5068 return (NULL); 5069 } 5070 break; 5071 case SCTP_SHUTDOWN: 5072 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n", 5073 (void *)stcb); 5074 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) { 5075 *offset = length; 5076 return (stcb); 5077 } 5078 if ((netp != NULL) && (*netp != NULL)) { 5079 int abort_flag = 0; 5080 5081 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch, 5082 stcb, *netp, &abort_flag); 5083 if (abort_flag) { 5084 *offset = length; 5085 return (NULL); 5086 } 5087 } 5088 break; 5089 case SCTP_SHUTDOWN_ACK: 5090 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_ACK, stcb %p\n", (void *)stcb); 5091 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 5092 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp); 5093 } 5094 *offset = length; 5095 return (NULL); 5096 break; 5097 case SCTP_OPERATION_ERROR: 5098 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP_ERR\n"); 5099 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL) && 5100 sctp_handle_error(ch, stcb, *netp, contiguous) < 0) { 5101 *offset = length; 5102 return (NULL); 5103 } 5104 break; 5105 case SCTP_COOKIE_ECHO: 5106 SCTPDBG(SCTP_DEBUG_INPUT3, 5107 "SCTP_COOKIE_ECHO, stcb %p\n", (void *)stcb); 5108 if ((stcb != NULL) && (stcb->asoc.total_output_queue_size > 0)) { 5109 ; 5110 } else { 5111 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5112 /* We are not interested anymore */ 5113 abend: 5114 if (stcb != NULL) { 5115 SCTP_TCB_UNLOCK(stcb); 5116 } 5117 *offset = length; 5118 return (NULL); 5119 } 5120 } 5121 /*- 5122 * First are we accepting? We do this again here 5123 * since it is possible that a previous endpoint WAS 5124 * listening responded to a INIT-ACK and then 5125 * closed. We opened and bound.. and are now no 5126 * longer listening. 5127 * 5128 * XXXGL: notes on checking listen queue length. 5129 * 1) SCTP_IS_LISTENING() doesn't necessarily mean 5130 * SOLISTENING(), because a listening "UDP type" 5131 * socket isn't listening in terms of the socket 5132 * layer. It is a normal data flow socket, that 5133 * can fork off new connections. Thus, we should 5134 * look into sol_qlen only in case we are !UDP. 5135 * 2) Checking sol_qlen in general requires locking 5136 * the socket, and this code lacks that. 5137 */ 5138 if ((stcb == NULL) && 5139 (!SCTP_IS_LISTENING(inp) || 5140 (!(inp->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE) && 5141 inp->sctp_socket->sol_qlen >= inp->sctp_socket->sol_qlimit))) { 5142 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 5143 (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) { 5144 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 5145 sctp_abort_association(inp, stcb, m, iphlen, 5146 src, dst, sh, op_err, 5147 mflowtype, mflowid, 5148 vrf_id, port); 5149 } 5150 *offset = length; 5151 return (NULL); 5152 } else { 5153 struct mbuf *ret_buf; 5154 struct sctp_inpcb *linp; 5155 5156 if (stcb) { 5157 linp = NULL; 5158 } else { 5159 linp = inp; 5160 } 5161 5162 if (linp != NULL) { 5163 SCTP_ASOC_CREATE_LOCK(linp); 5164 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 5165 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) { 5166 SCTP_ASOC_CREATE_UNLOCK(linp); 5167 goto abend; 5168 } 5169 } 5170 5171 if (netp != NULL) { 5172 struct sctp_tcb *locked_stcb; 5173 5174 locked_stcb = stcb; 5175 ret_buf = 5176 sctp_handle_cookie_echo(m, iphlen, 5177 *offset, 5178 src, dst, 5179 sh, 5180 (struct sctp_cookie_echo_chunk *)ch, 5181 &inp, &stcb, netp, 5182 auth_skipped, 5183 auth_offset, 5184 auth_len, 5185 &locked_stcb, 5186 mflowtype, 5187 mflowid, 5188 vrf_id, 5189 port); 5190 if ((locked_stcb != NULL) && (locked_stcb != stcb)) { 5191 SCTP_TCB_UNLOCK(locked_stcb); 5192 } 5193 if (stcb != NULL) { 5194 SCTP_TCB_LOCK_ASSERT(stcb); 5195 } 5196 } else { 5197 ret_buf = NULL; 5198 } 5199 if (linp != NULL) { 5200 SCTP_ASOC_CREATE_UNLOCK(linp); 5201 } 5202 if (ret_buf == NULL) { 5203 if (stcb != NULL) { 5204 SCTP_TCB_UNLOCK(stcb); 5205 } 5206 SCTPDBG(SCTP_DEBUG_INPUT3, 5207 "GAK, null buffer\n"); 5208 *offset = length; 5209 return (NULL); 5210 } 5211 /* if AUTH skipped, see if it verified... */ 5212 if (auth_skipped) { 5213 got_auth = 1; 5214 auth_skipped = 0; 5215 } 5216 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) { 5217 /* 5218 * Restart the timer if we have 5219 * pending data 5220 */ 5221 struct sctp_tmit_chunk *chk; 5222 5223 chk = TAILQ_FIRST(&stcb->asoc.sent_queue); 5224 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 5225 } 5226 } 5227 break; 5228 case SCTP_COOKIE_ACK: 5229 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE_ACK, stcb %p\n", (void *)stcb); 5230 if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) { 5231 return (stcb); 5232 } 5233 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5234 /* We are not interested anymore */ 5235 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 5236 ; 5237 } else if (stcb) { 5238 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5239 so = SCTP_INP_SO(inp); 5240 atomic_add_int(&stcb->asoc.refcnt, 1); 5241 SCTP_TCB_UNLOCK(stcb); 5242 SCTP_SOCKET_LOCK(so, 1); 5243 SCTP_TCB_LOCK(stcb); 5244 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5245 #endif 5246 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 5247 SCTP_FROM_SCTP_INPUT + SCTP_LOC_30); 5248 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5249 SCTP_SOCKET_UNLOCK(so, 1); 5250 #endif 5251 *offset = length; 5252 return (NULL); 5253 } 5254 } 5255 if ((netp != NULL) && (*netp != NULL)) { 5256 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp); 5257 } 5258 break; 5259 case SCTP_ECN_ECHO: 5260 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_ECHO\n"); 5261 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) { 5262 /* Its not ours */ 5263 *offset = length; 5264 return (stcb); 5265 } 5266 if (stcb->asoc.ecn_supported == 0) { 5267 goto unknown_chunk; 5268 } 5269 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, stcb); 5270 ecne_seen = 1; 5271 break; 5272 case SCTP_ECN_CWR: 5273 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_CWR\n"); 5274 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) { 5275 *offset = length; 5276 return (stcb); 5277 } 5278 if (stcb->asoc.ecn_supported == 0) { 5279 goto unknown_chunk; 5280 } 5281 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp); 5282 break; 5283 case SCTP_SHUTDOWN_COMPLETE: 5284 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_COMPLETE, stcb %p\n", (void *)stcb); 5285 /* must be first and only chunk */ 5286 if ((num_chunks > 1) || 5287 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 5288 *offset = length; 5289 return (stcb); 5290 } 5291 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 5292 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch, 5293 stcb, *netp); 5294 } 5295 *offset = length; 5296 return (NULL); 5297 break; 5298 case SCTP_ASCONF: 5299 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n"); 5300 if (stcb != NULL) { 5301 if (stcb->asoc.asconf_supported == 0) { 5302 goto unknown_chunk; 5303 } 5304 sctp_handle_asconf(m, *offset, src, 5305 (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0); 5306 asconf_cnt++; 5307 } 5308 break; 5309 case SCTP_ASCONF_ACK: 5310 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF_ACK\n"); 5311 if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) { 5312 /* Its not ours */ 5313 *offset = length; 5314 return (stcb); 5315 } 5316 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 5317 if (stcb->asoc.asconf_supported == 0) { 5318 goto unknown_chunk; 5319 } 5320 /* He's alive so give him credit */ 5321 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5322 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5323 stcb->asoc.overall_error_count, 5324 0, 5325 SCTP_FROM_SCTP_INPUT, 5326 __LINE__); 5327 } 5328 stcb->asoc.overall_error_count = 0; 5329 sctp_handle_asconf_ack(m, *offset, 5330 (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock); 5331 if (abort_no_unlock) 5332 return (NULL); 5333 } 5334 break; 5335 case SCTP_FORWARD_CUM_TSN: 5336 case SCTP_IFORWARD_CUM_TSN: 5337 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD_TSN\n"); 5338 if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) { 5339 /* Its not ours */ 5340 *offset = length; 5341 return (stcb); 5342 } 5343 5344 if (stcb != NULL) { 5345 int abort_flag = 0; 5346 5347 if (stcb->asoc.prsctp_supported == 0) { 5348 goto unknown_chunk; 5349 } 5350 *fwd_tsn_seen = 1; 5351 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5352 /* We are not interested anymore */ 5353 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5354 so = SCTP_INP_SO(inp); 5355 atomic_add_int(&stcb->asoc.refcnt, 1); 5356 SCTP_TCB_UNLOCK(stcb); 5357 SCTP_SOCKET_LOCK(so, 1); 5358 SCTP_TCB_LOCK(stcb); 5359 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5360 #endif 5361 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 5362 SCTP_FROM_SCTP_INPUT + SCTP_LOC_31); 5363 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5364 SCTP_SOCKET_UNLOCK(so, 1); 5365 #endif 5366 *offset = length; 5367 return (NULL); 5368 } 5369 /* 5370 * For sending a SACK this looks like DATA 5371 * chunks. 5372 */ 5373 stcb->asoc.last_data_chunk_from = stcb->asoc.last_control_chunk_from; 5374 sctp_handle_forward_tsn(stcb, 5375 (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset); 5376 if (abort_flag) { 5377 *offset = length; 5378 return (NULL); 5379 } 5380 } 5381 break; 5382 case SCTP_STREAM_RESET: 5383 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n"); 5384 if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) { 5385 /* Its not ours */ 5386 *offset = length; 5387 return (stcb); 5388 } 5389 if (stcb->asoc.reconfig_supported == 0) { 5390 goto unknown_chunk; 5391 } 5392 if (sctp_handle_stream_reset(stcb, m, *offset, ch)) { 5393 /* stop processing */ 5394 *offset = length; 5395 return (NULL); 5396 } 5397 break; 5398 case SCTP_PACKET_DROPPED: 5399 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n"); 5400 /* re-get it all please */ 5401 if (chk_length < sizeof(struct sctp_pktdrop_chunk)) { 5402 /* Its not ours */ 5403 *offset = length; 5404 return (stcb); 5405 } 5406 5407 if ((ch != NULL) && (stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 5408 if (stcb->asoc.pktdrop_supported == 0) { 5409 goto unknown_chunk; 5410 } 5411 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch, 5412 stcb, *netp, 5413 min(chk_length, contiguous)); 5414 } 5415 break; 5416 case SCTP_AUTHENTICATION: 5417 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n"); 5418 if (stcb == NULL) { 5419 /* save the first AUTH for later processing */ 5420 if (auth_skipped == 0) { 5421 auth_offset = *offset; 5422 auth_len = chk_length; 5423 auth_skipped = 1; 5424 } 5425 /* skip this chunk (temporarily) */ 5426 goto next_chunk; 5427 } 5428 if (stcb->asoc.auth_supported == 0) { 5429 goto unknown_chunk; 5430 } 5431 if ((chk_length < (sizeof(struct sctp_auth_chunk))) || 5432 (chk_length > (sizeof(struct sctp_auth_chunk) + 5433 SCTP_AUTH_DIGEST_LEN_MAX))) { 5434 /* Its not ours */ 5435 *offset = length; 5436 return (stcb); 5437 } 5438 if (got_auth == 1) { 5439 /* skip this chunk... it's already auth'd */ 5440 goto next_chunk; 5441 } 5442 got_auth = 1; 5443 if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch, 5444 m, *offset)) { 5445 /* auth HMAC failed so dump the packet */ 5446 *offset = length; 5447 return (stcb); 5448 } else { 5449 /* remaining chunks are HMAC checked */ 5450 stcb->asoc.authenticated = 1; 5451 } 5452 break; 5453 5454 default: 5455 unknown_chunk: 5456 /* it's an unknown chunk! */ 5457 if ((ch->chunk_type & 0x40) && (stcb != NULL)) { 5458 struct sctp_gen_error_cause *cause; 5459 int len; 5460 5461 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_gen_error_cause), 5462 0, M_NOWAIT, 1, MT_DATA); 5463 if (op_err != NULL) { 5464 len = min(SCTP_SIZE32(chk_length), (uint32_t)(length - *offset)); 5465 cause = mtod(op_err, struct sctp_gen_error_cause *); 5466 cause->code = htons(SCTP_CAUSE_UNRECOG_CHUNK); 5467 cause->length = htons((uint16_t)(len + sizeof(struct sctp_gen_error_cause))); 5468 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_gen_error_cause); 5469 SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(m, *offset, len, M_NOWAIT); 5470 if (SCTP_BUF_NEXT(op_err) != NULL) { 5471 #ifdef SCTP_MBUF_LOGGING 5472 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5473 sctp_log_mbc(SCTP_BUF_NEXT(op_err), SCTP_MBUF_ICOPY); 5474 } 5475 #endif 5476 sctp_queue_op_err(stcb, op_err); 5477 } else { 5478 sctp_m_freem(op_err); 5479 } 5480 } 5481 } 5482 if ((ch->chunk_type & 0x80) == 0) { 5483 /* discard this packet */ 5484 *offset = length; 5485 return (stcb); 5486 } /* else skip this bad chunk and continue... */ 5487 break; 5488 } /* switch (ch->chunk_type) */ 5489 5490 5491 next_chunk: 5492 /* get the next chunk */ 5493 *offset += SCTP_SIZE32(chk_length); 5494 if (*offset >= length) { 5495 /* no more data left in the mbuf chain */ 5496 break; 5497 } 5498 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 5499 sizeof(struct sctp_chunkhdr), chunk_buf); 5500 if (ch == NULL) { 5501 *offset = length; 5502 return (stcb); 5503 } 5504 } /* while */ 5505 5506 if ((asconf_cnt > 0) && (stcb != NULL)) { 5507 sctp_send_asconf_ack(stcb); 5508 } 5509 return (stcb); 5510 } 5511 5512 5513 /* 5514 * common input chunk processing (v4 and v6) 5515 */ 5516 void 5517 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length, 5518 struct sockaddr *src, struct sockaddr *dst, 5519 struct sctphdr *sh, struct sctp_chunkhdr *ch, 5520 uint8_t compute_crc, 5521 uint8_t ecn_bits, 5522 uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum, 5523 uint32_t vrf_id, uint16_t port) 5524 { 5525 uint32_t high_tsn; 5526 int fwd_tsn_seen = 0, data_processed = 0; 5527 struct mbuf *m = *mm, *op_err; 5528 char msg[SCTP_DIAG_INFO_LEN]; 5529 int un_sent; 5530 int cnt_ctrl_ready = 0; 5531 struct sctp_inpcb *inp = NULL, *inp_decr = NULL; 5532 struct sctp_tcb *stcb = NULL; 5533 struct sctp_nets *net = NULL; 5534 5535 SCTP_STAT_INCR(sctps_recvdatagrams); 5536 #ifdef SCTP_AUDITING_ENABLED 5537 sctp_audit_log(0xE0, 1); 5538 sctp_auditing(0, inp, stcb, net); 5539 #endif 5540 if (compute_crc != 0) { 5541 uint32_t check, calc_check; 5542 5543 check = sh->checksum; 5544 sh->checksum = 0; 5545 calc_check = sctp_calculate_cksum(m, iphlen); 5546 sh->checksum = check; 5547 if (calc_check != check) { 5548 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x m:%p mlen:%d iphlen:%d\n", 5549 calc_check, check, (void *)m, length, iphlen); 5550 stcb = sctp_findassociation_addr(m, offset, src, dst, 5551 sh, ch, &inp, &net, vrf_id); 5552 #if defined(INET) || defined(INET6) 5553 if ((ch->chunk_type != SCTP_INITIATION) && 5554 (net != NULL) && (net->port != port)) { 5555 if (net->port == 0) { 5556 /* UDP encapsulation turned on. */ 5557 net->mtu -= sizeof(struct udphdr); 5558 if (stcb->asoc.smallest_mtu > net->mtu) { 5559 sctp_pathmtu_adjustment(stcb, net->mtu); 5560 } 5561 } else if (port == 0) { 5562 /* UDP encapsulation turned off. */ 5563 net->mtu += sizeof(struct udphdr); 5564 /* XXX Update smallest_mtu */ 5565 } 5566 net->port = port; 5567 } 5568 #endif 5569 if (net != NULL) { 5570 net->flowtype = mflowtype; 5571 net->flowid = mflowid; 5572 } 5573 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 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_PROBE5(receive, NULL, stcb, m, stcb, sh); 5615 SCTP_STAT_INCR(sctps_noport); 5616 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) { 5617 goto out; 5618 } 5619 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 5620 sctp_send_shutdown_complete2(src, dst, sh, 5621 mflowtype, mflowid, fibnum, 5622 vrf_id, port); 5623 goto out; 5624 } 5625 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) { 5626 goto out; 5627 } 5628 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) { 5629 if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) || 5630 ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) && 5631 (ch->chunk_type != SCTP_INIT))) { 5632 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5633 "Out of the blue"); 5634 sctp_send_abort(m, iphlen, src, dst, 5635 sh, 0, op_err, 5636 mflowtype, mflowid, fibnum, 5637 vrf_id, port); 5638 } 5639 } 5640 goto out; 5641 } else if (stcb == NULL) { 5642 inp_decr = inp; 5643 } 5644 SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n", 5645 (void *)m, iphlen, offset, length, (void *)stcb); 5646 if (stcb) { 5647 /* always clear this before beginning a packet */ 5648 stcb->asoc.authenticated = 0; 5649 stcb->asoc.seen_a_sack_this_pkt = 0; 5650 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n", 5651 (void *)stcb, stcb->asoc.state); 5652 5653 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) || 5654 (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) { 5655 /*- 5656 * If we hit here, we had a ref count 5657 * up when the assoc was aborted and the 5658 * timer is clearing out the assoc, we should 5659 * NOT respond to any packet.. its OOTB. 5660 */ 5661 SCTP_TCB_UNLOCK(stcb); 5662 stcb = NULL; 5663 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5664 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5665 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5666 msg); 5667 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5668 mflowtype, mflowid, inp->fibnum, 5669 vrf_id, port); 5670 goto out; 5671 } 5672 } 5673 if (IS_SCTP_CONTROL(ch)) { 5674 /* process the control portion of the SCTP packet */ 5675 /* sa_ignore NO_NULL_CHK */ 5676 stcb = sctp_process_control(m, iphlen, &offset, length, 5677 src, dst, sh, ch, 5678 inp, stcb, &net, &fwd_tsn_seen, 5679 mflowtype, mflowid, fibnum, 5680 vrf_id, port); 5681 if (stcb) { 5682 /* 5683 * This covers us if the cookie-echo was there and 5684 * it changes our INP. 5685 */ 5686 inp = stcb->sctp_ep; 5687 #if defined(INET) || defined(INET6) 5688 if ((ch->chunk_type != SCTP_INITIATION) && 5689 (net != NULL) && (net->port != port)) { 5690 if (net->port == 0) { 5691 /* UDP encapsulation turned on. */ 5692 net->mtu -= sizeof(struct udphdr); 5693 if (stcb->asoc.smallest_mtu > net->mtu) { 5694 sctp_pathmtu_adjustment(stcb, net->mtu); 5695 } 5696 } else if (port == 0) { 5697 /* UDP encapsulation turned off. */ 5698 net->mtu += sizeof(struct udphdr); 5699 /* XXX Update smallest_mtu */ 5700 } 5701 net->port = port; 5702 } 5703 #endif 5704 } 5705 } else { 5706 /* 5707 * no control chunks, so pre-process DATA chunks (these 5708 * checks are taken care of by control processing) 5709 */ 5710 5711 /* 5712 * if DATA only packet, and auth is required, then punt... 5713 * can't have authenticated without any AUTH (control) 5714 * chunks 5715 */ 5716 if ((stcb != NULL) && 5717 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) { 5718 /* "silently" ignore */ 5719 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5720 SCTP_STAT_INCR(sctps_recvauthmissing); 5721 goto out; 5722 } 5723 if (stcb == NULL) { 5724 /* out of the blue DATA chunk */ 5725 SCTP_PROBE5(receive, NULL, NULL, m, NULL, sh); 5726 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5727 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5728 msg); 5729 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5730 mflowtype, mflowid, fibnum, 5731 vrf_id, port); 5732 goto out; 5733 } 5734 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) { 5735 /* v_tag mismatch! */ 5736 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5737 SCTP_STAT_INCR(sctps_badvtag); 5738 goto out; 5739 } 5740 } 5741 5742 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5743 if (stcb == NULL) { 5744 /* 5745 * no valid TCB for this packet, or we found it's a bad 5746 * packet while processing control, or we're done with this 5747 * packet (done or skip rest of data), so we drop it... 5748 */ 5749 goto out; 5750 } 5751 5752 /* 5753 * DATA chunk processing 5754 */ 5755 /* plow through the data chunks while length > offset */ 5756 5757 /* 5758 * Rest should be DATA only. Check authentication state if AUTH for 5759 * DATA is required. 5760 */ 5761 if ((length > offset) && 5762 (stcb != NULL) && 5763 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) && 5764 !stcb->asoc.authenticated) { 5765 /* "silently" ignore */ 5766 SCTP_STAT_INCR(sctps_recvauthmissing); 5767 SCTPDBG(SCTP_DEBUG_AUTH1, 5768 "Data chunk requires AUTH, skipped\n"); 5769 goto trigger_send; 5770 } 5771 if (length > offset) { 5772 int retval; 5773 5774 /* 5775 * First check to make sure our state is correct. We would 5776 * not get here unless we really did have a tag, so we don't 5777 * abort if this happens, just dump the chunk silently. 5778 */ 5779 switch (SCTP_GET_STATE(stcb)) { 5780 case SCTP_STATE_COOKIE_ECHOED: 5781 /* 5782 * we consider data with valid tags in this state 5783 * shows us the cookie-ack was lost. Imply it was 5784 * there. 5785 */ 5786 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net); 5787 break; 5788 case SCTP_STATE_COOKIE_WAIT: 5789 /* 5790 * We consider OOTB any data sent during asoc setup. 5791 */ 5792 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5793 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5794 msg); 5795 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5796 mflowtype, mflowid, inp->fibnum, 5797 vrf_id, port); 5798 goto out; 5799 /* sa_ignore NOTREACHED */ 5800 break; 5801 case SCTP_STATE_EMPTY: /* should not happen */ 5802 case SCTP_STATE_INUSE: /* should not happen */ 5803 case SCTP_STATE_SHUTDOWN_RECEIVED: /* This is a peer error */ 5804 case SCTP_STATE_SHUTDOWN_ACK_SENT: 5805 default: 5806 goto out; 5807 /* sa_ignore NOTREACHED */ 5808 break; 5809 case SCTP_STATE_OPEN: 5810 case SCTP_STATE_SHUTDOWN_SENT: 5811 break; 5812 } 5813 /* plow through the data chunks while length > offset */ 5814 retval = sctp_process_data(mm, iphlen, &offset, length, 5815 inp, stcb, net, &high_tsn); 5816 if (retval == 2) { 5817 /* 5818 * The association aborted, NO UNLOCK needed since 5819 * the association is destroyed. 5820 */ 5821 stcb = NULL; 5822 goto out; 5823 } 5824 data_processed = 1; 5825 /* 5826 * Anything important needs to have been m_copy'ed in 5827 * process_data 5828 */ 5829 } 5830 5831 /* take care of ecn */ 5832 if ((data_processed == 1) && 5833 (stcb->asoc.ecn_supported == 1) && 5834 ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) { 5835 /* Yep, we need to add a ECNE */ 5836 sctp_send_ecn_echo(stcb, net, high_tsn); 5837 } 5838 5839 if ((data_processed == 0) && (fwd_tsn_seen)) { 5840 int was_a_gap; 5841 uint32_t highest_tsn; 5842 5843 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) { 5844 highest_tsn = stcb->asoc.highest_tsn_inside_nr_map; 5845 } else { 5846 highest_tsn = stcb->asoc.highest_tsn_inside_map; 5847 } 5848 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn); 5849 stcb->asoc.send_sack = 1; 5850 sctp_sack_check(stcb, was_a_gap); 5851 } else if (fwd_tsn_seen) { 5852 stcb->asoc.send_sack = 1; 5853 } 5854 /* trigger send of any chunks in queue... */ 5855 trigger_send: 5856 #ifdef SCTP_AUDITING_ENABLED 5857 sctp_audit_log(0xE0, 2); 5858 sctp_auditing(1, inp, stcb, net); 5859 #endif 5860 SCTPDBG(SCTP_DEBUG_INPUT1, 5861 "Check for chunk output prw:%d tqe:%d tf=%d\n", 5862 stcb->asoc.peers_rwnd, 5863 TAILQ_EMPTY(&stcb->asoc.control_send_queue), 5864 stcb->asoc.total_flight); 5865 un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight); 5866 if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 5867 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq; 5868 } 5869 if (!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue) || 5870 cnt_ctrl_ready || 5871 stcb->asoc.trigger_reset || 5872 ((un_sent) && 5873 (stcb->asoc.peers_rwnd > 0 || 5874 (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) { 5875 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n"); 5876 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 5877 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n"); 5878 } 5879 #ifdef SCTP_AUDITING_ENABLED 5880 sctp_audit_log(0xE0, 3); 5881 sctp_auditing(2, inp, stcb, net); 5882 #endif 5883 out: 5884 if (stcb != NULL) { 5885 SCTP_TCB_UNLOCK(stcb); 5886 } 5887 if (inp_decr != NULL) { 5888 /* reduce ref-count */ 5889 SCTP_INP_WLOCK(inp_decr); 5890 SCTP_INP_DECR_REF(inp_decr); 5891 SCTP_INP_WUNLOCK(inp_decr); 5892 } 5893 return; 5894 } 5895 5896 #ifdef INET 5897 void 5898 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port) 5899 { 5900 struct mbuf *m; 5901 int iphlen; 5902 uint32_t vrf_id = 0; 5903 uint8_t ecn_bits; 5904 struct sockaddr_in src, dst; 5905 struct ip *ip; 5906 struct sctphdr *sh; 5907 struct sctp_chunkhdr *ch; 5908 int length, offset; 5909 uint8_t compute_crc; 5910 uint32_t mflowid; 5911 uint8_t mflowtype; 5912 uint16_t fibnum; 5913 5914 iphlen = off; 5915 if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) { 5916 SCTP_RELEASE_PKT(i_pak); 5917 return; 5918 } 5919 m = SCTP_HEADER_TO_CHAIN(i_pak); 5920 #ifdef SCTP_MBUF_LOGGING 5921 /* Log in any input mbufs */ 5922 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5923 sctp_log_mbc(m, SCTP_MBUF_INPUT); 5924 } 5925 #endif 5926 #ifdef SCTP_PACKET_LOGGING 5927 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) { 5928 sctp_packet_log(m); 5929 } 5930 #endif 5931 SCTPDBG(SCTP_DEBUG_CRCOFFLOAD, 5932 "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n", 5933 m->m_pkthdr.len, 5934 if_name(m->m_pkthdr.rcvif), 5935 (int)m->m_pkthdr.csum_flags, CSUM_BITS); 5936 mflowid = m->m_pkthdr.flowid; 5937 mflowtype = M_HASHTYPE_GET(m); 5938 fibnum = M_GETFIB(m); 5939 SCTP_STAT_INCR(sctps_recvpackets); 5940 SCTP_STAT_INCR_COUNTER64(sctps_inpackets); 5941 /* Get IP, SCTP, and first chunk header together in the first mbuf. */ 5942 offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr); 5943 if (SCTP_BUF_LEN(m) < offset) { 5944 if ((m = m_pullup(m, offset)) == NULL) { 5945 SCTP_STAT_INCR(sctps_hdrops); 5946 return; 5947 } 5948 } 5949 ip = mtod(m, struct ip *); 5950 sh = (struct sctphdr *)((caddr_t)ip + iphlen); 5951 ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr)); 5952 offset -= sizeof(struct sctp_chunkhdr); 5953 memset(&src, 0, sizeof(struct sockaddr_in)); 5954 src.sin_family = AF_INET; 5955 src.sin_len = sizeof(struct sockaddr_in); 5956 src.sin_port = sh->src_port; 5957 src.sin_addr = ip->ip_src; 5958 memset(&dst, 0, sizeof(struct sockaddr_in)); 5959 dst.sin_family = AF_INET; 5960 dst.sin_len = sizeof(struct sockaddr_in); 5961 dst.sin_port = sh->dest_port; 5962 dst.sin_addr = ip->ip_dst; 5963 length = ntohs(ip->ip_len); 5964 /* Validate mbuf chain length with IP payload length. */ 5965 if (SCTP_HEADER_LEN(m) != length) { 5966 SCTPDBG(SCTP_DEBUG_INPUT1, 5967 "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m)); 5968 SCTP_STAT_INCR(sctps_hdrops); 5969 goto out; 5970 } 5971 /* SCTP does not allow broadcasts or multicasts */ 5972 if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) { 5973 goto out; 5974 } 5975 if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) { 5976 goto out; 5977 } 5978 ecn_bits = ip->ip_tos; 5979 if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) { 5980 SCTP_STAT_INCR(sctps_recvhwcrc); 5981 compute_crc = 0; 5982 } else { 5983 SCTP_STAT_INCR(sctps_recvswcrc); 5984 compute_crc = 1; 5985 } 5986 sctp_common_input_processing(&m, iphlen, offset, length, 5987 (struct sockaddr *)&src, 5988 (struct sockaddr *)&dst, 5989 sh, ch, 5990 compute_crc, 5991 ecn_bits, 5992 mflowtype, mflowid, fibnum, 5993 vrf_id, port); 5994 out: 5995 if (m) { 5996 sctp_m_freem(m); 5997 } 5998 return; 5999 } 6000 6001 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP) 6002 extern int *sctp_cpuarry; 6003 #endif 6004 6005 int 6006 sctp_input(struct mbuf **mp, int *offp, int proto SCTP_UNUSED) 6007 { 6008 struct mbuf *m; 6009 int off; 6010 6011 m = *mp; 6012 off = *offp; 6013 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP) 6014 if (mp_ncpus > 1) { 6015 struct ip *ip; 6016 struct sctphdr *sh; 6017 int offset; 6018 int cpu_to_use; 6019 uint32_t flowid, tag; 6020 6021 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) { 6022 flowid = m->m_pkthdr.flowid; 6023 } else { 6024 /* 6025 * No flow id built by lower layers fix it so we 6026 * create one. 6027 */ 6028 offset = off + sizeof(struct sctphdr); 6029 if (SCTP_BUF_LEN(m) < offset) { 6030 if ((m = m_pullup(m, offset)) == NULL) { 6031 SCTP_STAT_INCR(sctps_hdrops); 6032 return (IPPROTO_DONE); 6033 } 6034 } 6035 ip = mtod(m, struct ip *); 6036 sh = (struct sctphdr *)((caddr_t)ip + off); 6037 tag = htonl(sh->v_tag); 6038 flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port); 6039 m->m_pkthdr.flowid = flowid; 6040 M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE_HASH); 6041 } 6042 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus]; 6043 sctp_queue_to_mcore(m, off, cpu_to_use); 6044 return (IPPROTO_DONE); 6045 } 6046 #endif 6047 sctp_input_with_port(m, off, 0); 6048 return (IPPROTO_DONE); 6049 } 6050 #endif
Cache object: 7974fd4b0b398463f5fe9d61a42cb50b
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]