1 /*- 2 * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved. 3 * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved. 4 * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions are met: 8 * 9 * a) Redistributions of source code must retain the above copyright notice, 10 * this list of conditions and the following disclaimer. 11 * 12 * b) Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in 14 * the documentation and/or other materials provided with the distribution. 15 * 16 * c) Neither the name of Cisco Systems, Inc. nor the names of its 17 * contributors may be used to endorse or promote products derived 18 * from this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 22 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 24 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 30 * THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 #include <sys/cdefs.h> 34 __FBSDID("$FreeBSD$"); 35 36 #include <netinet/sctp_os.h> 37 #include <netinet/sctp_var.h> 38 #include <netinet/sctp_sysctl.h> 39 #include <netinet/sctp_pcb.h> 40 #include <netinet/sctp_header.h> 41 #include <netinet/sctputil.h> 42 #include <netinet/sctp_output.h> 43 #include <netinet/sctp_input.h> 44 #include <netinet/sctp_auth.h> 45 #include <netinet/sctp_indata.h> 46 #include <netinet/sctp_asconf.h> 47 #include <netinet/sctp_bsd_addr.h> 48 #include <netinet/sctp_timer.h> 49 #include <netinet/sctp_crc32.h> 50 #include <netinet/udp.h> 51 #include <sys/smp.h> 52 53 54 55 static void 56 sctp_stop_all_cookie_timers(struct sctp_tcb *stcb) 57 { 58 struct sctp_nets *net; 59 60 /* 61 * This now not only stops all cookie timers it also stops any INIT 62 * timers as well. This will make sure that the timers are stopped 63 * in all collision cases. 64 */ 65 SCTP_TCB_LOCK_ASSERT(stcb); 66 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 67 if (net->rxt_timer.type == SCTP_TIMER_TYPE_COOKIE) { 68 sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE, 69 stcb->sctp_ep, 70 stcb, 71 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_1); 72 } else if (net->rxt_timer.type == SCTP_TIMER_TYPE_INIT) { 73 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, 74 stcb->sctp_ep, 75 stcb, 76 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_2); 77 } 78 } 79 } 80 81 /* INIT handler */ 82 static void 83 sctp_handle_init(struct mbuf *m, int iphlen, int offset, struct sctphdr *sh, 84 struct sctp_init_chunk *cp, struct sctp_inpcb *inp, struct sctp_tcb *stcb, 85 int *abort_no_unlock, uint32_t vrf_id, uint16_t port) 86 { 87 struct sctp_init *init; 88 struct mbuf *op_err; 89 90 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_init: handling INIT tcb:%p\n", 91 stcb); 92 if (stcb == NULL) { 93 SCTP_INP_RLOCK(inp); 94 } 95 /* validate length */ 96 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_chunk)) { 97 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 98 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err, 99 vrf_id, port); 100 if (stcb) 101 *abort_no_unlock = 1; 102 goto outnow; 103 } 104 /* validate parameters */ 105 init = &cp->init; 106 if (init->initiate_tag == 0) { 107 /* protocol error... send abort */ 108 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 109 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err, 110 vrf_id, port); 111 if (stcb) 112 *abort_no_unlock = 1; 113 goto outnow; 114 } 115 if (ntohl(init->a_rwnd) < SCTP_MIN_RWND) { 116 /* invalid parameter... send abort */ 117 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 118 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err, 119 vrf_id, port); 120 if (stcb) 121 *abort_no_unlock = 1; 122 goto outnow; 123 } 124 if (init->num_inbound_streams == 0) { 125 /* protocol error... send abort */ 126 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 127 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err, 128 vrf_id, port); 129 if (stcb) 130 *abort_no_unlock = 1; 131 goto outnow; 132 } 133 if (init->num_outbound_streams == 0) { 134 /* protocol error... send abort */ 135 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 136 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err, 137 vrf_id, port); 138 if (stcb) 139 *abort_no_unlock = 1; 140 goto outnow; 141 } 142 if (sctp_validate_init_auth_params(m, offset + sizeof(*cp), 143 offset + ntohs(cp->ch.chunk_length))) { 144 /* auth parameter(s) error... send abort */ 145 sctp_abort_association(inp, stcb, m, iphlen, sh, NULL, vrf_id, port); 146 if (stcb) 147 *abort_no_unlock = 1; 148 goto outnow; 149 } 150 /* 151 * We are only accepting if we have a socket with positive 152 * so_qlimit. 153 */ 154 if ((stcb == NULL) && 155 ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 156 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) || 157 (inp->sctp_socket == NULL) || 158 (inp->sctp_socket->so_qlimit == 0))) { 159 /* 160 * FIX ME ?? What about TCP model and we have a 161 * match/restart case? Actually no fix is needed. the lookup 162 * will always find the existing assoc so stcb would not be 163 * NULL. It may be questionable to do this since we COULD 164 * just send back the INIT-ACK and hope that the app did 165 * accept()'s by the time the COOKIE was sent. But there is 166 * a price to pay for COOKIE generation and I don't want to 167 * pay it on the chance that the app will actually do some 168 * accepts(). The App just looses and should NOT be in this 169 * state :-) 170 */ 171 if (SCTP_BASE_SYSCTL(sctp_blackhole) == 0) { 172 sctp_send_abort(m, iphlen, sh, 0, NULL, vrf_id, port); 173 } 174 goto outnow; 175 } 176 if ((stcb != NULL) && 177 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT)) { 178 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending SHUTDOWN-ACK\n"); 179 sctp_send_shutdown_ack(stcb, NULL); 180 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 181 } else { 182 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n"); 183 sctp_send_initiate_ack(inp, stcb, m, iphlen, offset, sh, cp, vrf_id, port, 184 ((stcb == NULL) ? SCTP_HOLDS_LOCK : SCTP_NOT_LOCKED)); 185 } 186 outnow: 187 if (stcb == NULL) { 188 SCTP_INP_RUNLOCK(inp); 189 } 190 } 191 192 /* 193 * process peer "INIT/INIT-ACK" chunk returns value < 0 on error 194 */ 195 196 int 197 sctp_is_there_unsent_data(struct sctp_tcb *stcb, int so_locked 198 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING) 199 SCTP_UNUSED 200 #endif 201 ) 202 { 203 int unsent_data = 0; 204 unsigned int i; 205 struct sctp_stream_queue_pending *sp; 206 struct sctp_association *asoc; 207 208 /* 209 * This function returns the number of streams that have true unsent 210 * data on them. Note that as it looks through it will clean up any 211 * places that have old data that has been sent but left at top of 212 * stream queue. 213 */ 214 asoc = &stcb->asoc; 215 SCTP_TCB_SEND_LOCK(stcb); 216 if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 217 /* Check to see if some data queued */ 218 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 219 /* sa_ignore FREED_MEMORY */ 220 sp = TAILQ_FIRST(&stcb->asoc.strmout[i].outqueue); 221 if (sp == NULL) { 222 continue; 223 } 224 if ((sp->msg_is_complete) && 225 (sp->length == 0) && 226 (sp->sender_all_done)) { 227 /* 228 * We are doing differed cleanup. Last time 229 * through when we took all the data the 230 * sender_all_done was not set. 231 */ 232 if (sp->put_last_out == 0) { 233 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n"); 234 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n", 235 sp->sender_all_done, 236 sp->length, 237 sp->msg_is_complete, 238 sp->put_last_out); 239 } 240 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1); 241 TAILQ_REMOVE(&stcb->asoc.strmout[i].outqueue, sp, next); 242 if (sp->net) { 243 sctp_free_remote_addr(sp->net); 244 sp->net = NULL; 245 } 246 if (sp->data) { 247 sctp_m_freem(sp->data); 248 sp->data = NULL; 249 } 250 sctp_free_a_strmoq(stcb, sp, so_locked); 251 } else { 252 unsent_data++; 253 break; 254 } 255 } 256 } 257 SCTP_TCB_SEND_UNLOCK(stcb); 258 return (unsent_data); 259 } 260 261 static int 262 sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb) 263 { 264 struct sctp_init *init; 265 struct sctp_association *asoc; 266 struct sctp_nets *lnet; 267 unsigned int i; 268 269 init = &cp->init; 270 asoc = &stcb->asoc; 271 /* save off parameters */ 272 asoc->peer_vtag = ntohl(init->initiate_tag); 273 asoc->peers_rwnd = ntohl(init->a_rwnd); 274 /* init tsn's */ 275 asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1; 276 277 if (!TAILQ_EMPTY(&asoc->nets)) { 278 /* update any ssthresh's that may have a default */ 279 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) { 280 lnet->ssthresh = asoc->peers_rwnd; 281 if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) { 282 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION); 283 } 284 } 285 } 286 SCTP_TCB_SEND_LOCK(stcb); 287 if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) { 288 unsigned int newcnt; 289 struct sctp_stream_out *outs; 290 struct sctp_stream_queue_pending *sp, *nsp; 291 struct sctp_tmit_chunk *chk, *nchk; 292 293 /* abandon the upper streams */ 294 newcnt = ntohs(init->num_inbound_streams); 295 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) { 296 if (chk->rec.data.stream_number >= newcnt) { 297 TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next); 298 asoc->send_queue_cnt--; 299 if (chk->data != NULL) { 300 sctp_free_bufspace(stcb, asoc, chk, 1); 301 sctp_ulp_notify(SCTP_NOTIFY_UNSENT_DG_FAIL, stcb, 302 0, chk, SCTP_SO_NOT_LOCKED); 303 if (chk->data) { 304 sctp_m_freem(chk->data); 305 chk->data = NULL; 306 } 307 } 308 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 309 /* sa_ignore FREED_MEMORY */ 310 } 311 } 312 if (asoc->strmout) { 313 for (i = newcnt; i < asoc->pre_open_streams; i++) { 314 outs = &asoc->strmout[i]; 315 TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) { 316 TAILQ_REMOVE(&outs->outqueue, sp, next); 317 asoc->stream_queue_cnt--; 318 sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL, 319 stcb, 0, sp, SCTP_SO_NOT_LOCKED); 320 if (sp->data) { 321 sctp_m_freem(sp->data); 322 sp->data = NULL; 323 } 324 if (sp->net) { 325 sctp_free_remote_addr(sp->net); 326 sp->net = NULL; 327 } 328 /* Free the chunk */ 329 sctp_free_a_strmoq(stcb, sp, SCTP_SO_NOT_LOCKED); 330 /* sa_ignore FREED_MEMORY */ 331 } 332 } 333 } 334 /* cut back the count */ 335 asoc->pre_open_streams = newcnt; 336 } 337 SCTP_TCB_SEND_UNLOCK(stcb); 338 asoc->strm_realoutsize = asoc->streamoutcnt = asoc->pre_open_streams; 339 340 /* EY - nr_sack: initialize highest tsn in nr_mapping_array */ 341 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 342 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 343 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 344 } 345 /* This is the next one we expect */ 346 asoc->str_reset_seq_in = asoc->asconf_seq_in + 1; 347 348 asoc->mapping_array_base_tsn = ntohl(init->initial_tsn); 349 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in; 350 351 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 352 /* open the requested streams */ 353 354 if (asoc->strmin != NULL) { 355 /* Free the old ones */ 356 struct sctp_queued_to_read *ctl, *nctl; 357 358 for (i = 0; i < asoc->streamincnt; i++) { 359 TAILQ_FOREACH_SAFE(ctl, &asoc->strmin[i].inqueue, next, nctl) { 360 TAILQ_REMOVE(&asoc->strmin[i].inqueue, ctl, next); 361 sctp_free_remote_addr(ctl->whoFrom); 362 ctl->whoFrom = NULL; 363 sctp_m_freem(ctl->data); 364 ctl->data = NULL; 365 sctp_free_a_readq(stcb, ctl); 366 } 367 } 368 SCTP_FREE(asoc->strmin, SCTP_M_STRMI); 369 } 370 asoc->streamincnt = ntohs(init->num_outbound_streams); 371 if (asoc->streamincnt > MAX_SCTP_STREAMS) { 372 asoc->streamincnt = MAX_SCTP_STREAMS; 373 } 374 SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt * 375 sizeof(struct sctp_stream_in), SCTP_M_STRMI); 376 if (asoc->strmin == NULL) { 377 /* we didn't get memory for the streams! */ 378 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n"); 379 return (-1); 380 } 381 for (i = 0; i < asoc->streamincnt; i++) { 382 asoc->strmin[i].stream_no = i; 383 asoc->strmin[i].last_sequence_delivered = 0xffff; 384 /* 385 * U-stream ranges will be set when the cookie is unpacked. 386 * Or for the INIT sender they are un set (if pr-sctp not 387 * supported) when the INIT-ACK arrives. 388 */ 389 TAILQ_INIT(&asoc->strmin[i].inqueue); 390 asoc->strmin[i].delivery_started = 0; 391 } 392 /* 393 * load_address_from_init will put the addresses into the 394 * association when the COOKIE is processed or the INIT-ACK is 395 * processed. Both types of COOKIE's existing and new call this 396 * routine. It will remove addresses that are no longer in the 397 * association (for the restarting case where addresses are 398 * removed). Up front when the INIT arrives we will discard it if it 399 * is a restart and new addresses have been added. 400 */ 401 /* sa_ignore MEMLEAK */ 402 return (0); 403 } 404 405 /* 406 * INIT-ACK message processing/consumption returns value < 0 on error 407 */ 408 static int 409 sctp_process_init_ack(struct mbuf *m, int iphlen, int offset, 410 struct sctphdr *sh, struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 411 struct sctp_nets *net, int *abort_no_unlock, uint32_t vrf_id) 412 { 413 struct sctp_association *asoc; 414 struct mbuf *op_err; 415 int retval, abort_flag; 416 uint32_t initack_limit; 417 int nat_friendly = 0; 418 419 /* First verify that we have no illegal param's */ 420 abort_flag = 0; 421 op_err = NULL; 422 423 op_err = sctp_arethere_unrecognized_parameters(m, 424 (offset + sizeof(struct sctp_init_chunk)), 425 &abort_flag, (struct sctp_chunkhdr *)cp, &nat_friendly); 426 if (abort_flag) { 427 /* Send an abort and notify peer */ 428 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 429 *abort_no_unlock = 1; 430 return (-1); 431 } 432 asoc = &stcb->asoc; 433 asoc->peer_supports_nat = (uint8_t) nat_friendly; 434 /* process the peer's parameters in the INIT-ACK */ 435 retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb); 436 if (retval < 0) { 437 return (retval); 438 } 439 initack_limit = offset + ntohs(cp->ch.chunk_length); 440 /* load all addresses */ 441 if ((retval = sctp_load_addresses_from_init(stcb, m, 442 (offset + sizeof(struct sctp_init_chunk)), initack_limit, sh, 443 NULL))) { 444 /* Huh, we should abort */ 445 SCTPDBG(SCTP_DEBUG_INPUT1, 446 "Load addresses from INIT causes an abort %d\n", 447 retval); 448 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 449 NULL, 0, net->port); 450 *abort_no_unlock = 1; 451 return (-1); 452 } 453 /* if the peer doesn't support asconf, flush the asconf queue */ 454 if (asoc->peer_supports_asconf == 0) { 455 struct sctp_asconf_addr *param, *nparam; 456 457 TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) { 458 TAILQ_REMOVE(&asoc->asconf_queue, param, next); 459 SCTP_FREE(param, SCTP_M_ASC_ADDR); 460 } 461 } 462 stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs, 463 stcb->asoc.local_hmacs); 464 if (op_err) { 465 sctp_queue_op_err(stcb, op_err); 466 /* queuing will steal away the mbuf chain to the out queue */ 467 op_err = NULL; 468 } 469 /* extract the cookie and queue it to "echo" it back... */ 470 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 471 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 472 stcb->asoc.overall_error_count, 473 0, 474 SCTP_FROM_SCTP_INPUT, 475 __LINE__); 476 } 477 stcb->asoc.overall_error_count = 0; 478 net->error_count = 0; 479 480 /* 481 * Cancel the INIT timer, We do this first before queueing the 482 * cookie. We always cancel at the primary to assue that we are 483 * canceling the timer started by the INIT which always goes to the 484 * primary. 485 */ 486 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb, 487 asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4); 488 489 /* calculate the RTO */ 490 net->RTO = sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, sctp_align_safe_nocopy, 491 SCTP_RTT_FROM_NON_DATA); 492 493 retval = sctp_send_cookie_echo(m, offset, stcb, net); 494 if (retval < 0) { 495 /* 496 * No cookie, we probably should send a op error. But in any 497 * case if there is no cookie in the INIT-ACK, we can 498 * abandon the peer, its broke. 499 */ 500 if (retval == -3) { 501 /* We abort with an error of missing mandatory param */ 502 op_err = 503 sctp_generate_invmanparam(SCTP_CAUSE_MISSING_PARAM); 504 if (op_err) { 505 /* 506 * Expand beyond to include the mandatory 507 * param cookie 508 */ 509 struct sctp_inv_mandatory_param *mp; 510 511 SCTP_BUF_LEN(op_err) = 512 sizeof(struct sctp_inv_mandatory_param); 513 mp = mtod(op_err, 514 struct sctp_inv_mandatory_param *); 515 /* Subtract the reserved param */ 516 mp->length = 517 htons(sizeof(struct sctp_inv_mandatory_param) - 2); 518 mp->num_param = htonl(1); 519 mp->param = htons(SCTP_STATE_COOKIE); 520 mp->resv = 0; 521 } 522 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 523 sh, op_err, vrf_id, net->port); 524 *abort_no_unlock = 1; 525 } 526 return (retval); 527 } 528 return (0); 529 } 530 531 static void 532 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp, 533 struct sctp_tcb *stcb, struct sctp_nets *net) 534 { 535 struct sockaddr_storage store; 536 struct sctp_nets *r_net, *f_net; 537 struct timeval tv; 538 int req_prim = 0; 539 uint16_t old_error_counter; 540 541 #ifdef INET 542 struct sockaddr_in *sin; 543 544 #endif 545 #ifdef INET6 546 struct sockaddr_in6 *sin6; 547 548 #endif 549 550 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) { 551 /* Invalid length */ 552 return; 553 } 554 memset(&store, 0, sizeof(store)); 555 switch (cp->heartbeat.hb_info.addr_family) { 556 #ifdef INET 557 case AF_INET: 558 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) { 559 sin = (struct sockaddr_in *)&store; 560 sin->sin_family = cp->heartbeat.hb_info.addr_family; 561 sin->sin_len = cp->heartbeat.hb_info.addr_len; 562 sin->sin_port = stcb->rport; 563 memcpy(&sin->sin_addr, cp->heartbeat.hb_info.address, 564 sizeof(sin->sin_addr)); 565 } else { 566 return; 567 } 568 break; 569 #endif 570 #ifdef INET6 571 case AF_INET6: 572 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) { 573 sin6 = (struct sockaddr_in6 *)&store; 574 sin6->sin6_family = cp->heartbeat.hb_info.addr_family; 575 sin6->sin6_len = cp->heartbeat.hb_info.addr_len; 576 sin6->sin6_port = stcb->rport; 577 memcpy(&sin6->sin6_addr, cp->heartbeat.hb_info.address, 578 sizeof(sin6->sin6_addr)); 579 } else { 580 return; 581 } 582 break; 583 #endif 584 default: 585 return; 586 } 587 r_net = sctp_findnet(stcb, (struct sockaddr *)&store); 588 if (r_net == NULL) { 589 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n"); 590 return; 591 } 592 if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) && 593 (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) && 594 (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) { 595 /* 596 * If the its a HB and it's random value is correct when can 597 * confirm the destination. 598 */ 599 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 600 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) { 601 stcb->asoc.primary_destination = r_net; 602 r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY; 603 f_net = TAILQ_FIRST(&stcb->asoc.nets); 604 if (f_net != r_net) { 605 /* 606 * first one on the list is NOT the primary 607 * sctp_cmpaddr() is much more efficent if 608 * the primary is the first on the list, 609 * make it so. 610 */ 611 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next); 612 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next); 613 } 614 req_prim = 1; 615 } 616 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 617 stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 618 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3); 619 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 620 } 621 old_error_counter = r_net->error_count; 622 r_net->error_count = 0; 623 r_net->hb_responded = 1; 624 tv.tv_sec = cp->heartbeat.hb_info.time_value_1; 625 tv.tv_usec = cp->heartbeat.hb_info.time_value_2; 626 /* Now lets do a RTO with this */ 627 r_net->RTO = sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, sctp_align_safe_nocopy, 628 SCTP_RTT_FROM_NON_DATA); 629 if (!(r_net->dest_state & SCTP_ADDR_REACHABLE)) { 630 r_net->dest_state |= SCTP_ADDR_REACHABLE; 631 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb, 632 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 633 } 634 if (r_net->dest_state & SCTP_ADDR_PF) { 635 r_net->dest_state &= ~SCTP_ADDR_PF; 636 stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net); 637 } 638 if (old_error_counter > 0) { 639 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3); 640 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 641 } 642 if (r_net == stcb->asoc.primary_destination) { 643 if (stcb->asoc.alternate) { 644 /* release the alternate, primary is good */ 645 sctp_free_remote_addr(stcb->asoc.alternate); 646 stcb->asoc.alternate = NULL; 647 } 648 } 649 /* Mobility adaptation */ 650 if (req_prim) { 651 if ((sctp_is_mobility_feature_on(stcb->sctp_ep, 652 SCTP_MOBILITY_BASE) || 653 sctp_is_mobility_feature_on(stcb->sctp_ep, 654 SCTP_MOBILITY_FASTHANDOFF)) && 655 sctp_is_mobility_feature_on(stcb->sctp_ep, 656 SCTP_MOBILITY_PRIM_DELETED)) { 657 658 sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED, stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_TIMER + SCTP_LOC_7); 659 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 660 SCTP_MOBILITY_FASTHANDOFF)) { 661 sctp_assoc_immediate_retrans(stcb, 662 stcb->asoc.primary_destination); 663 } 664 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 665 SCTP_MOBILITY_BASE)) { 666 sctp_move_chunks_from_net(stcb, 667 stcb->asoc.deleted_primary); 668 } 669 sctp_delete_prim_timer(stcb->sctp_ep, stcb, 670 stcb->asoc.deleted_primary); 671 } 672 } 673 } 674 675 static int 676 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb) 677 { 678 /* 679 * return 0 means we want you to proceed with the abort non-zero 680 * means no abort processing 681 */ 682 struct sctpasochead *head; 683 684 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_WAIT) { 685 /* generate a new vtag and send init */ 686 LIST_REMOVE(stcb, sctp_asocs); 687 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 688 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 689 /* 690 * put it in the bucket in the vtag hash of assoc's for the 691 * system 692 */ 693 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 694 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 695 return (1); 696 } 697 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) { 698 /* 699 * treat like a case where the cookie expired i.e.: - dump 700 * current cookie. - generate a new vtag. - resend init. 701 */ 702 /* generate a new vtag and send init */ 703 LIST_REMOVE(stcb, sctp_asocs); 704 stcb->asoc.state &= ~SCTP_STATE_COOKIE_ECHOED; 705 stcb->asoc.state |= SCTP_STATE_COOKIE_WAIT; 706 sctp_stop_all_cookie_timers(stcb); 707 sctp_toss_old_cookies(stcb, &stcb->asoc); 708 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 709 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 710 /* 711 * put it in the bucket in the vtag hash of assoc's for the 712 * system 713 */ 714 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 715 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 716 return (1); 717 } 718 return (0); 719 } 720 721 static int 722 sctp_handle_nat_missing_state(struct sctp_tcb *stcb, 723 struct sctp_nets *net) 724 { 725 /* 726 * return 0 means we want you to proceed with the abort non-zero 727 * means no abort processing 728 */ 729 if (stcb->asoc.peer_supports_auth == 0) { 730 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n"); 731 return (0); 732 } 733 sctp_asconf_send_nat_state_update(stcb, net); 734 return (1); 735 } 736 737 738 static void 739 sctp_handle_abort(struct sctp_abort_chunk *abort, 740 struct sctp_tcb *stcb, struct sctp_nets *net) 741 { 742 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 743 struct socket *so; 744 745 #endif 746 uint16_t len; 747 uint16_t error; 748 749 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n"); 750 if (stcb == NULL) 751 return; 752 753 len = ntohs(abort->ch.chunk_length); 754 if (len > sizeof(struct sctp_chunkhdr)) { 755 /* 756 * Need to check the cause codes for our two magic nat 757 * aborts which don't kill the assoc necessarily. 758 */ 759 struct sctp_missing_nat_state *natc; 760 761 natc = (struct sctp_missing_nat_state *)(abort + 1); 762 error = ntohs(natc->cause); 763 if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) { 764 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n", 765 abort->ch.chunk_flags); 766 if (sctp_handle_nat_colliding_state(stcb)) { 767 return; 768 } 769 } else if (error == SCTP_CAUSE_NAT_MISSING_STATE) { 770 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n", 771 abort->ch.chunk_flags); 772 if (sctp_handle_nat_missing_state(stcb, net)) { 773 return; 774 } 775 } 776 } else { 777 error = 0; 778 } 779 /* stop any receive timers */ 780 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_6); 781 /* notify user of the abort and clean up... */ 782 sctp_abort_notification(stcb, 1, error, abort, SCTP_SO_NOT_LOCKED); 783 /* free the tcb */ 784 SCTP_STAT_INCR_COUNTER32(sctps_aborted); 785 if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) || 786 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 787 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 788 } 789 #ifdef SCTP_ASOCLOG_OF_TSNS 790 sctp_print_out_track_log(stcb); 791 #endif 792 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 793 so = SCTP_INP_SO(stcb->sctp_ep); 794 atomic_add_int(&stcb->asoc.refcnt, 1); 795 SCTP_TCB_UNLOCK(stcb); 796 SCTP_SOCKET_LOCK(so, 1); 797 SCTP_TCB_LOCK(stcb); 798 atomic_subtract_int(&stcb->asoc.refcnt, 1); 799 #endif 800 stcb->asoc.state |= SCTP_STATE_WAS_ABORTED; 801 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 802 SCTP_FROM_SCTP_INPUT + SCTP_LOC_6); 803 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 804 SCTP_SOCKET_UNLOCK(so, 1); 805 #endif 806 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n"); 807 } 808 809 static void 810 sctp_start_net_timers(struct sctp_tcb *stcb) 811 { 812 uint32_t cnt_hb_sent; 813 struct sctp_nets *net; 814 815 cnt_hb_sent = 0; 816 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 817 /* 818 * For each network start: 1) A pmtu timer. 2) A HB timer 3) 819 * If the dest in unconfirmed send a hb as well if under 820 * max_hb_burst have been sent. 821 */ 822 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net); 823 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net); 824 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) && 825 (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) { 826 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 827 cnt_hb_sent++; 828 } 829 } 830 if (cnt_hb_sent) { 831 sctp_chunk_output(stcb->sctp_ep, stcb, 832 SCTP_OUTPUT_FROM_COOKIE_ACK, 833 SCTP_SO_NOT_LOCKED); 834 } 835 } 836 837 838 static void 839 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp, 840 struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag) 841 { 842 struct sctp_association *asoc; 843 int some_on_streamwheel; 844 845 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 846 struct socket *so; 847 848 #endif 849 850 SCTPDBG(SCTP_DEBUG_INPUT2, 851 "sctp_handle_shutdown: handling SHUTDOWN\n"); 852 if (stcb == NULL) 853 return; 854 asoc = &stcb->asoc; 855 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) || 856 (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) { 857 return; 858 } 859 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) { 860 /* Shutdown NOT the expected size */ 861 return; 862 } else { 863 sctp_update_acked(stcb, cp, abort_flag); 864 if (*abort_flag) { 865 return; 866 } 867 } 868 if (asoc->control_pdapi) { 869 /* 870 * With a normal shutdown we assume the end of last record. 871 */ 872 SCTP_INP_READ_LOCK(stcb->sctp_ep); 873 asoc->control_pdapi->end_added = 1; 874 asoc->control_pdapi->pdapi_aborted = 1; 875 asoc->control_pdapi = NULL; 876 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 877 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 878 so = SCTP_INP_SO(stcb->sctp_ep); 879 atomic_add_int(&stcb->asoc.refcnt, 1); 880 SCTP_TCB_UNLOCK(stcb); 881 SCTP_SOCKET_LOCK(so, 1); 882 SCTP_TCB_LOCK(stcb); 883 atomic_subtract_int(&stcb->asoc.refcnt, 1); 884 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 885 /* assoc was freed while we were unlocked */ 886 SCTP_SOCKET_UNLOCK(so, 1); 887 return; 888 } 889 #endif 890 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 891 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 892 SCTP_SOCKET_UNLOCK(so, 1); 893 #endif 894 } 895 /* goto SHUTDOWN_RECEIVED state to block new requests */ 896 if (stcb->sctp_socket) { 897 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) && 898 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) && 899 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) { 900 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_RECEIVED); 901 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 902 /* 903 * notify upper layer that peer has initiated a 904 * shutdown 905 */ 906 sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 907 908 /* reset time */ 909 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 910 } 911 } 912 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) { 913 /* 914 * stop the shutdown timer, since we WILL move to 915 * SHUTDOWN-ACK-SENT. 916 */ 917 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_8); 918 } 919 /* Now is there unsent data on a stream somewhere? */ 920 some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED); 921 922 if (!TAILQ_EMPTY(&asoc->send_queue) || 923 !TAILQ_EMPTY(&asoc->sent_queue) || 924 some_on_streamwheel) { 925 /* By returning we will push more data out */ 926 return; 927 } else { 928 /* no outstanding data to send, so move on... */ 929 /* send SHUTDOWN-ACK */ 930 sctp_send_shutdown_ack(stcb, net); 931 /* move to SHUTDOWN-ACK-SENT state */ 932 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) || 933 (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 934 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 935 } 936 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT); 937 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 938 sctp_stop_timers_for_shutdown(stcb); 939 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, 940 stcb, net); 941 } 942 } 943 944 static void 945 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED, 946 struct sctp_tcb *stcb, 947 struct sctp_nets *net) 948 { 949 struct sctp_association *asoc; 950 951 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 952 struct socket *so; 953 954 so = SCTP_INP_SO(stcb->sctp_ep); 955 #endif 956 SCTPDBG(SCTP_DEBUG_INPUT2, 957 "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n"); 958 if (stcb == NULL) 959 return; 960 961 asoc = &stcb->asoc; 962 /* process according to association state */ 963 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) || 964 (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) { 965 /* unexpected SHUTDOWN-ACK... do OOTB handling... */ 966 sctp_send_shutdown_complete(stcb, net, 1); 967 SCTP_TCB_UNLOCK(stcb); 968 return; 969 } 970 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) && 971 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) { 972 /* unexpected SHUTDOWN-ACK... so ignore... */ 973 SCTP_TCB_UNLOCK(stcb); 974 return; 975 } 976 if (asoc->control_pdapi) { 977 /* 978 * With a normal shutdown we assume the end of last record. 979 */ 980 SCTP_INP_READ_LOCK(stcb->sctp_ep); 981 asoc->control_pdapi->end_added = 1; 982 asoc->control_pdapi->pdapi_aborted = 1; 983 asoc->control_pdapi = NULL; 984 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 985 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 986 atomic_add_int(&stcb->asoc.refcnt, 1); 987 SCTP_TCB_UNLOCK(stcb); 988 SCTP_SOCKET_LOCK(so, 1); 989 SCTP_TCB_LOCK(stcb); 990 atomic_subtract_int(&stcb->asoc.refcnt, 1); 991 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 992 /* assoc was freed while we were unlocked */ 993 SCTP_SOCKET_UNLOCK(so, 1); 994 return; 995 } 996 #endif 997 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 998 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 999 SCTP_SOCKET_UNLOCK(so, 1); 1000 #endif 1001 } 1002 /* are the queues empty? */ 1003 if (!TAILQ_EMPTY(&asoc->send_queue) || 1004 !TAILQ_EMPTY(&asoc->sent_queue) || 1005 !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 1006 sctp_report_all_outbound(stcb, 0, 0, SCTP_SO_NOT_LOCKED); 1007 } 1008 /* stop the timer */ 1009 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9); 1010 /* send SHUTDOWN-COMPLETE */ 1011 sctp_send_shutdown_complete(stcb, net, 0); 1012 /* notify upper layer protocol */ 1013 if (stcb->sctp_socket) { 1014 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1015 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 1016 stcb->sctp_socket->so_snd.sb_cc = 0; 1017 } 1018 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 1019 } 1020 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 1021 /* free the TCB but first save off the ep */ 1022 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1023 atomic_add_int(&stcb->asoc.refcnt, 1); 1024 SCTP_TCB_UNLOCK(stcb); 1025 SCTP_SOCKET_LOCK(so, 1); 1026 SCTP_TCB_LOCK(stcb); 1027 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1028 #endif 1029 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1030 SCTP_FROM_SCTP_INPUT + SCTP_LOC_10); 1031 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1032 SCTP_SOCKET_UNLOCK(so, 1); 1033 #endif 1034 } 1035 1036 /* 1037 * Skip past the param header and then we will find the chunk that caused the 1038 * problem. There are two possiblities ASCONF or FWD-TSN other than that and 1039 * our peer must be broken. 1040 */ 1041 static void 1042 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr, 1043 struct sctp_nets *net) 1044 { 1045 struct sctp_chunkhdr *chk; 1046 1047 chk = (struct sctp_chunkhdr *)((caddr_t)phdr + sizeof(*phdr)); 1048 switch (chk->chunk_type) { 1049 case SCTP_ASCONF_ACK: 1050 case SCTP_ASCONF: 1051 sctp_asconf_cleanup(stcb, net); 1052 break; 1053 case SCTP_FORWARD_CUM_TSN: 1054 stcb->asoc.peer_supports_prsctp = 0; 1055 break; 1056 default: 1057 SCTPDBG(SCTP_DEBUG_INPUT2, 1058 "Peer does not support chunk type %d(%x)??\n", 1059 chk->chunk_type, (uint32_t) chk->chunk_type); 1060 break; 1061 } 1062 } 1063 1064 /* 1065 * Skip past the param header and then we will find the param that caused the 1066 * problem. There are a number of param's in a ASCONF OR the prsctp param 1067 * these will turn of specific features. 1068 */ 1069 static void 1070 sctp_process_unrecog_param(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr) 1071 { 1072 struct sctp_paramhdr *pbad; 1073 1074 pbad = phdr + 1; 1075 switch (ntohs(pbad->param_type)) { 1076 /* pr-sctp draft */ 1077 case SCTP_PRSCTP_SUPPORTED: 1078 stcb->asoc.peer_supports_prsctp = 0; 1079 break; 1080 case SCTP_SUPPORTED_CHUNK_EXT: 1081 break; 1082 /* draft-ietf-tsvwg-addip-sctp */ 1083 case SCTP_HAS_NAT_SUPPORT: 1084 stcb->asoc.peer_supports_nat = 0; 1085 break; 1086 case SCTP_ADD_IP_ADDRESS: 1087 case SCTP_DEL_IP_ADDRESS: 1088 case SCTP_SET_PRIM_ADDR: 1089 stcb->asoc.peer_supports_asconf = 0; 1090 break; 1091 case SCTP_SUCCESS_REPORT: 1092 case SCTP_ERROR_CAUSE_IND: 1093 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n"); 1094 SCTPDBG(SCTP_DEBUG_INPUT2, 1095 "Turning off ASCONF to this strange peer\n"); 1096 stcb->asoc.peer_supports_asconf = 0; 1097 break; 1098 default: 1099 SCTPDBG(SCTP_DEBUG_INPUT2, 1100 "Peer does not support param type %d(%x)??\n", 1101 pbad->param_type, (uint32_t) pbad->param_type); 1102 break; 1103 } 1104 } 1105 1106 static int 1107 sctp_handle_error(struct sctp_chunkhdr *ch, 1108 struct sctp_tcb *stcb, struct sctp_nets *net) 1109 { 1110 int chklen; 1111 struct sctp_paramhdr *phdr; 1112 uint16_t error, error_type; 1113 uint16_t error_len; 1114 struct sctp_association *asoc; 1115 int adjust; 1116 1117 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1118 struct socket *so; 1119 1120 #endif 1121 1122 /* parse through all of the errors and process */ 1123 asoc = &stcb->asoc; 1124 phdr = (struct sctp_paramhdr *)((caddr_t)ch + 1125 sizeof(struct sctp_chunkhdr)); 1126 chklen = ntohs(ch->chunk_length) - sizeof(struct sctp_chunkhdr); 1127 error = 0; 1128 while ((size_t)chklen >= sizeof(struct sctp_paramhdr)) { 1129 /* Process an Error Cause */ 1130 error_type = ntohs(phdr->param_type); 1131 error_len = ntohs(phdr->param_length); 1132 if ((error_len > chklen) || (error_len == 0)) { 1133 /* invalid param length for this param */ 1134 SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in error param- chunk left:%d errorlen:%d\n", 1135 chklen, error_len); 1136 return (0); 1137 } 1138 if (error == 0) { 1139 /* report the first error cause */ 1140 error = error_type; 1141 } 1142 switch (error_type) { 1143 case SCTP_CAUSE_INVALID_STREAM: 1144 case SCTP_CAUSE_MISSING_PARAM: 1145 case SCTP_CAUSE_INVALID_PARAM: 1146 case SCTP_CAUSE_NO_USER_DATA: 1147 SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %d back? We have a bug :/ (or do they?)\n", 1148 error_type); 1149 break; 1150 case SCTP_CAUSE_NAT_COLLIDING_STATE: 1151 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n", 1152 ch->chunk_flags); 1153 if (sctp_handle_nat_colliding_state(stcb)) { 1154 return (0); 1155 } 1156 break; 1157 case SCTP_CAUSE_NAT_MISSING_STATE: 1158 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n", 1159 ch->chunk_flags); 1160 if (sctp_handle_nat_missing_state(stcb, net)) { 1161 return (0); 1162 } 1163 break; 1164 case SCTP_CAUSE_STALE_COOKIE: 1165 /* 1166 * We only act if we have echoed a cookie and are 1167 * waiting. 1168 */ 1169 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) { 1170 int *p; 1171 1172 p = (int *)((caddr_t)phdr + sizeof(*phdr)); 1173 /* Save the time doubled */ 1174 asoc->cookie_preserve_req = ntohl(*p) << 1; 1175 asoc->stale_cookie_count++; 1176 if (asoc->stale_cookie_count > 1177 asoc->max_init_times) { 1178 sctp_abort_notification(stcb, 0, 0, NULL, SCTP_SO_NOT_LOCKED); 1179 /* now free the asoc */ 1180 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1181 so = SCTP_INP_SO(stcb->sctp_ep); 1182 atomic_add_int(&stcb->asoc.refcnt, 1); 1183 SCTP_TCB_UNLOCK(stcb); 1184 SCTP_SOCKET_LOCK(so, 1); 1185 SCTP_TCB_LOCK(stcb); 1186 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1187 #endif 1188 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1189 SCTP_FROM_SCTP_INPUT + SCTP_LOC_11); 1190 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1191 SCTP_SOCKET_UNLOCK(so, 1); 1192 #endif 1193 return (-1); 1194 } 1195 /* blast back to INIT state */ 1196 sctp_toss_old_cookies(stcb, &stcb->asoc); 1197 asoc->state &= ~SCTP_STATE_COOKIE_ECHOED; 1198 asoc->state |= SCTP_STATE_COOKIE_WAIT; 1199 sctp_stop_all_cookie_timers(stcb); 1200 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 1201 } 1202 break; 1203 case SCTP_CAUSE_UNRESOLVABLE_ADDR: 1204 /* 1205 * Nothing we can do here, we don't do hostname 1206 * addresses so if the peer does not like my IPv6 1207 * (or IPv4 for that matter) it does not matter. If 1208 * they don't support that type of address, they can 1209 * NOT possibly get that packet type... i.e. with no 1210 * IPv6 you can't recieve a IPv6 packet. so we can 1211 * safely ignore this one. If we ever added support 1212 * for HOSTNAME Addresses, then we would need to do 1213 * something here. 1214 */ 1215 break; 1216 case SCTP_CAUSE_UNRECOG_CHUNK: 1217 sctp_process_unrecog_chunk(stcb, phdr, net); 1218 break; 1219 case SCTP_CAUSE_UNRECOG_PARAM: 1220 sctp_process_unrecog_param(stcb, phdr); 1221 break; 1222 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN: 1223 /* 1224 * We ignore this since the timer will drive out a 1225 * new cookie anyway and there timer will drive us 1226 * to send a SHUTDOWN_COMPLETE. We can't send one 1227 * here since we don't have their tag. 1228 */ 1229 break; 1230 case SCTP_CAUSE_DELETING_LAST_ADDR: 1231 case SCTP_CAUSE_RESOURCE_SHORTAGE: 1232 case SCTP_CAUSE_DELETING_SRC_ADDR: 1233 /* 1234 * We should NOT get these here, but in a 1235 * ASCONF-ACK. 1236 */ 1237 SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a Operational Error?<%d>?\n", 1238 error_type); 1239 break; 1240 case SCTP_CAUSE_OUT_OF_RESC: 1241 /* 1242 * And what, pray tell do we do with the fact that 1243 * the peer is out of resources? Not really sure we 1244 * could do anything but abort. I suspect this 1245 * should have came WITH an abort instead of in a 1246 * OP-ERROR. 1247 */ 1248 break; 1249 default: 1250 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown error type = 0x%xh\n", 1251 error_type); 1252 break; 1253 } 1254 adjust = SCTP_SIZE32(error_len); 1255 chklen -= adjust; 1256 phdr = (struct sctp_paramhdr *)((caddr_t)phdr + adjust); 1257 } 1258 sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, error, ch, SCTP_SO_NOT_LOCKED); 1259 return (0); 1260 } 1261 1262 static int 1263 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset, 1264 struct sctphdr *sh, struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 1265 struct sctp_nets *net, int *abort_no_unlock, uint32_t vrf_id) 1266 { 1267 struct sctp_init_ack *init_ack; 1268 struct mbuf *op_err; 1269 1270 SCTPDBG(SCTP_DEBUG_INPUT2, 1271 "sctp_handle_init_ack: handling INIT-ACK\n"); 1272 1273 if (stcb == NULL) { 1274 SCTPDBG(SCTP_DEBUG_INPUT2, 1275 "sctp_handle_init_ack: TCB is null\n"); 1276 return (-1); 1277 } 1278 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) { 1279 /* Invalid length */ 1280 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 1281 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 1282 op_err, 0, net->port); 1283 *abort_no_unlock = 1; 1284 return (-1); 1285 } 1286 init_ack = &cp->init; 1287 /* validate parameters */ 1288 if (init_ack->initiate_tag == 0) { 1289 /* protocol error... send an abort */ 1290 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 1291 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 1292 op_err, 0, net->port); 1293 *abort_no_unlock = 1; 1294 return (-1); 1295 } 1296 if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) { 1297 /* protocol error... send an abort */ 1298 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 1299 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 1300 op_err, 0, net->port); 1301 *abort_no_unlock = 1; 1302 return (-1); 1303 } 1304 if (init_ack->num_inbound_streams == 0) { 1305 /* protocol error... send an abort */ 1306 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 1307 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 1308 op_err, 0, net->port); 1309 *abort_no_unlock = 1; 1310 return (-1); 1311 } 1312 if (init_ack->num_outbound_streams == 0) { 1313 /* protocol error... send an abort */ 1314 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 1315 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 1316 op_err, 0, net->port); 1317 *abort_no_unlock = 1; 1318 return (-1); 1319 } 1320 /* process according to association state... */ 1321 switch (stcb->asoc.state & SCTP_STATE_MASK) { 1322 case SCTP_STATE_COOKIE_WAIT: 1323 /* this is the expected state for this chunk */ 1324 /* process the INIT-ACK parameters */ 1325 if (stcb->asoc.primary_destination->dest_state & 1326 SCTP_ADDR_UNCONFIRMED) { 1327 /* 1328 * The primary is where we sent the INIT, we can 1329 * always consider it confirmed when the INIT-ACK is 1330 * returned. Do this before we load addresses 1331 * though. 1332 */ 1333 stcb->asoc.primary_destination->dest_state &= 1334 ~SCTP_ADDR_UNCONFIRMED; 1335 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 1336 stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED); 1337 } 1338 if (sctp_process_init_ack(m, iphlen, offset, sh, cp, stcb, 1339 net, abort_no_unlock, vrf_id) < 0) { 1340 /* error in parsing parameters */ 1341 return (-1); 1342 } 1343 /* update our state */ 1344 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n"); 1345 SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_ECHOED); 1346 1347 /* reset the RTO calc */ 1348 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 1349 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 1350 stcb->asoc.overall_error_count, 1351 0, 1352 SCTP_FROM_SCTP_INPUT, 1353 __LINE__); 1354 } 1355 stcb->asoc.overall_error_count = 0; 1356 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 1357 /* 1358 * collapse the init timer back in case of a exponential 1359 * backoff 1360 */ 1361 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep, 1362 stcb, net); 1363 /* 1364 * the send at the end of the inbound data processing will 1365 * cause the cookie to be sent 1366 */ 1367 break; 1368 case SCTP_STATE_SHUTDOWN_SENT: 1369 /* incorrect state... discard */ 1370 break; 1371 case SCTP_STATE_COOKIE_ECHOED: 1372 /* incorrect state... discard */ 1373 break; 1374 case SCTP_STATE_OPEN: 1375 /* incorrect state... discard */ 1376 break; 1377 case SCTP_STATE_EMPTY: 1378 case SCTP_STATE_INUSE: 1379 default: 1380 /* incorrect state... discard */ 1381 return (-1); 1382 break; 1383 } 1384 SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n"); 1385 return (0); 1386 } 1387 1388 static struct sctp_tcb * 1389 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1390 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1391 struct sctp_inpcb *inp, struct sctp_nets **netp, 1392 struct sockaddr *init_src, int *notification, 1393 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1394 uint32_t vrf_id, uint16_t port); 1395 1396 1397 /* 1398 * handle a state cookie for an existing association m: input packet mbuf 1399 * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a 1400 * "split" mbuf and the cookie signature does not exist offset: offset into 1401 * mbuf to the cookie-echo chunk 1402 */ 1403 static struct sctp_tcb * 1404 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset, 1405 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1406 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp, 1407 struct sockaddr *init_src, int *notification, 1408 uint32_t vrf_id, int auth_skipped, uint32_t auth_offset, uint32_t auth_len, uint16_t port) 1409 { 1410 struct sctp_association *asoc; 1411 struct sctp_init_chunk *init_cp, init_buf; 1412 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1413 struct sctp_nets *net; 1414 struct mbuf *op_err; 1415 struct sctp_paramhdr *ph; 1416 int init_offset, initack_offset, i; 1417 int retval; 1418 int spec_flag = 0; 1419 uint32_t how_indx; 1420 1421 net = *netp; 1422 /* I know that the TCB is non-NULL from the caller */ 1423 asoc = &stcb->asoc; 1424 for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) { 1425 if (asoc->cookie_how[how_indx] == 0) 1426 break; 1427 } 1428 if (how_indx < sizeof(asoc->cookie_how)) { 1429 asoc->cookie_how[how_indx] = 1; 1430 } 1431 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 1432 /* SHUTDOWN came in after sending INIT-ACK */ 1433 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination); 1434 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 1435 0, M_DONTWAIT, 1, MT_DATA); 1436 if (op_err == NULL) { 1437 /* FOOBAR */ 1438 return (NULL); 1439 } 1440 /* Set the len */ 1441 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_paramhdr); 1442 ph = mtod(op_err, struct sctp_paramhdr *); 1443 ph->param_type = htons(SCTP_CAUSE_COOKIE_IN_SHUTDOWN); 1444 ph->param_length = htons(sizeof(struct sctp_paramhdr)); 1445 sctp_send_operr_to(m, iphlen, op_err, cookie->peers_vtag, 1446 vrf_id, net->port); 1447 if (how_indx < sizeof(asoc->cookie_how)) 1448 asoc->cookie_how[how_indx] = 2; 1449 return (NULL); 1450 } 1451 /* 1452 * find and validate the INIT chunk in the cookie (peer's info) the 1453 * INIT should start after the cookie-echo header struct (chunk 1454 * header, state cookie header struct) 1455 */ 1456 init_offset = offset += sizeof(struct sctp_cookie_echo_chunk); 1457 1458 init_cp = (struct sctp_init_chunk *) 1459 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 1460 (uint8_t *) & init_buf); 1461 if (init_cp == NULL) { 1462 /* could not pull a INIT chunk in cookie */ 1463 return (NULL); 1464 } 1465 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 1466 return (NULL); 1467 } 1468 /* 1469 * find and validate the INIT-ACK chunk in the cookie (my info) the 1470 * INIT-ACK follows the INIT chunk 1471 */ 1472 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 1473 initack_cp = (struct sctp_init_ack_chunk *) 1474 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 1475 (uint8_t *) & initack_buf); 1476 if (initack_cp == NULL) { 1477 /* could not pull INIT-ACK chunk in cookie */ 1478 return (NULL); 1479 } 1480 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 1481 return (NULL); 1482 } 1483 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1484 (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) { 1485 /* 1486 * case D in Section 5.2.4 Table 2: MMAA process accordingly 1487 * to get into the OPEN state 1488 */ 1489 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1490 /*- 1491 * Opps, this means that we somehow generated two vtag's 1492 * the same. I.e. we did: 1493 * Us Peer 1494 * <---INIT(tag=a)------ 1495 * ----INIT-ACK(tag=t)--> 1496 * ----INIT(tag=t)------> *1 1497 * <---INIT-ACK(tag=a)--- 1498 * <----CE(tag=t)------------- *2 1499 * 1500 * At point *1 we should be generating a different 1501 * tag t'. Which means we would throw away the CE and send 1502 * ours instead. Basically this is case C (throw away side). 1503 */ 1504 if (how_indx < sizeof(asoc->cookie_how)) 1505 asoc->cookie_how[how_indx] = 17; 1506 return (NULL); 1507 1508 } 1509 switch SCTP_GET_STATE 1510 (asoc) { 1511 case SCTP_STATE_COOKIE_WAIT: 1512 case SCTP_STATE_COOKIE_ECHOED: 1513 /* 1514 * INIT was sent but got a COOKIE_ECHO with the 1515 * correct tags... just accept it...but we must 1516 * process the init so that we can make sure we have 1517 * the right seq no's. 1518 */ 1519 /* First we must process the INIT !! */ 1520 retval = sctp_process_init(init_cp, stcb); 1521 if (retval < 0) { 1522 if (how_indx < sizeof(asoc->cookie_how)) 1523 asoc->cookie_how[how_indx] = 3; 1524 return (NULL); 1525 } 1526 /* we have already processed the INIT so no problem */ 1527 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, 1528 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_12); 1529 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_13); 1530 /* update current state */ 1531 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) 1532 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1533 else 1534 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1535 1536 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1537 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1538 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1539 stcb->sctp_ep, stcb, asoc->primary_destination); 1540 } 1541 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1542 sctp_stop_all_cookie_timers(stcb); 1543 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1544 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1545 (inp->sctp_socket->so_qlimit == 0) 1546 ) { 1547 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1548 struct socket *so; 1549 1550 #endif 1551 /* 1552 * Here is where collision would go if we 1553 * did a connect() and instead got a 1554 * init/init-ack/cookie done before the 1555 * init-ack came back.. 1556 */ 1557 stcb->sctp_ep->sctp_flags |= 1558 SCTP_PCB_FLAGS_CONNECTED; 1559 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1560 so = SCTP_INP_SO(stcb->sctp_ep); 1561 atomic_add_int(&stcb->asoc.refcnt, 1); 1562 SCTP_TCB_UNLOCK(stcb); 1563 SCTP_SOCKET_LOCK(so, 1); 1564 SCTP_TCB_LOCK(stcb); 1565 atomic_add_int(&stcb->asoc.refcnt, -1); 1566 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1567 SCTP_SOCKET_UNLOCK(so, 1); 1568 return (NULL); 1569 } 1570 #endif 1571 soisconnected(stcb->sctp_socket); 1572 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1573 SCTP_SOCKET_UNLOCK(so, 1); 1574 #endif 1575 } 1576 /* notify upper layer */ 1577 *notification = SCTP_NOTIFY_ASSOC_UP; 1578 /* 1579 * since we did not send a HB make sure we don't 1580 * double things 1581 */ 1582 net->hb_responded = 1; 1583 net->RTO = sctp_calculate_rto(stcb, asoc, net, 1584 &cookie->time_entered, 1585 sctp_align_unsafe_makecopy, 1586 SCTP_RTT_FROM_NON_DATA); 1587 1588 if (stcb->asoc.sctp_autoclose_ticks && 1589 (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) { 1590 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 1591 inp, stcb, NULL); 1592 } 1593 break; 1594 default: 1595 /* 1596 * we're in the OPEN state (or beyond), so peer must 1597 * have simply lost the COOKIE-ACK 1598 */ 1599 break; 1600 } /* end switch */ 1601 sctp_stop_all_cookie_timers(stcb); 1602 /* 1603 * We ignore the return code here.. not sure if we should 1604 * somehow abort.. but we do have an existing asoc. This 1605 * really should not fail. 1606 */ 1607 if (sctp_load_addresses_from_init(stcb, m, 1608 init_offset + sizeof(struct sctp_init_chunk), 1609 initack_offset, sh, init_src)) { 1610 if (how_indx < sizeof(asoc->cookie_how)) 1611 asoc->cookie_how[how_indx] = 4; 1612 return (NULL); 1613 } 1614 /* respond with a COOKIE-ACK */ 1615 sctp_toss_old_cookies(stcb, asoc); 1616 sctp_send_cookie_ack(stcb); 1617 if (how_indx < sizeof(asoc->cookie_how)) 1618 asoc->cookie_how[how_indx] = 5; 1619 return (stcb); 1620 } 1621 if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1622 ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag && 1623 cookie->tie_tag_my_vtag == 0 && 1624 cookie->tie_tag_peer_vtag == 0) { 1625 /* 1626 * case C in Section 5.2.4 Table 2: XMOO silently discard 1627 */ 1628 if (how_indx < sizeof(asoc->cookie_how)) 1629 asoc->cookie_how[how_indx] = 6; 1630 return (NULL); 1631 } 1632 /* 1633 * If nat support, and the below and stcb is established, send back 1634 * a ABORT(colliding state) if we are established. 1635 */ 1636 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) && 1637 (asoc->peer_supports_nat) && 1638 ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1639 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1640 (asoc->peer_vtag == 0)))) { 1641 /* 1642 * Special case - Peer's support nat. We may have two init's 1643 * that we gave out the same tag on since one was not 1644 * established.. i.e. we get INIT from host-1 behind the nat 1645 * and we respond tag-a, we get a INIT from host-2 behind 1646 * the nat and we get tag-a again. Then we bring up host-1 1647 * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1). 1648 * Now we have colliding state. We must send an abort here 1649 * with colliding state indication. 1650 */ 1651 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 1652 0, M_DONTWAIT, 1, MT_DATA); 1653 if (op_err == NULL) { 1654 /* FOOBAR */ 1655 return (NULL); 1656 } 1657 /* pre-reserve some space */ 1658 #ifdef INET6 1659 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr)); 1660 #else 1661 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip)); 1662 #endif 1663 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr)); 1664 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr)); 1665 /* Set the len */ 1666 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_paramhdr); 1667 ph = mtod(op_err, struct sctp_paramhdr *); 1668 ph->param_type = htons(SCTP_CAUSE_NAT_COLLIDING_STATE); 1669 ph->param_length = htons(sizeof(struct sctp_paramhdr)); 1670 sctp_send_abort(m, iphlen, sh, 0, op_err, vrf_id, port); 1671 return (NULL); 1672 } 1673 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1674 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1675 (asoc->peer_vtag == 0))) { 1676 /* 1677 * case B in Section 5.2.4 Table 2: MXAA or MOAA my info 1678 * should be ok, re-accept peer info 1679 */ 1680 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1681 /* 1682 * Extension of case C. If we hit this, then the 1683 * random number generator returned the same vtag 1684 * when we first sent our INIT-ACK and when we later 1685 * sent our INIT. The side with the seq numbers that 1686 * are different will be the one that normnally 1687 * would have hit case C. This in effect "extends" 1688 * our vtags in this collision case to be 64 bits. 1689 * The same collision could occur aka you get both 1690 * vtag and seq number the same twice in a row.. but 1691 * is much less likely. If it did happen then we 1692 * would proceed through and bring up the assoc.. we 1693 * may end up with the wrong stream setup however.. 1694 * which would be bad.. but there is no way to 1695 * tell.. until we send on a stream that does not 1696 * exist :-) 1697 */ 1698 if (how_indx < sizeof(asoc->cookie_how)) 1699 asoc->cookie_how[how_indx] = 7; 1700 1701 return (NULL); 1702 } 1703 if (how_indx < sizeof(asoc->cookie_how)) 1704 asoc->cookie_how[how_indx] = 8; 1705 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_14); 1706 sctp_stop_all_cookie_timers(stcb); 1707 /* 1708 * since we did not send a HB make sure we don't double 1709 * things 1710 */ 1711 net->hb_responded = 1; 1712 if (stcb->asoc.sctp_autoclose_ticks && 1713 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 1714 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, 1715 NULL); 1716 } 1717 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1718 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 1719 1720 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) { 1721 /* 1722 * Ok the peer probably discarded our data (if we 1723 * echoed a cookie+data). So anything on the 1724 * sent_queue should be marked for retransmit, we 1725 * may not get something to kick us so it COULD 1726 * still take a timeout to move these.. but it can't 1727 * hurt to mark them. 1728 */ 1729 struct sctp_tmit_chunk *chk; 1730 1731 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 1732 if (chk->sent < SCTP_DATAGRAM_RESEND) { 1733 chk->sent = SCTP_DATAGRAM_RESEND; 1734 sctp_flight_size_decrease(chk); 1735 sctp_total_flight_decrease(stcb, chk); 1736 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 1737 spec_flag++; 1738 } 1739 } 1740 1741 } 1742 /* process the INIT info (peer's info) */ 1743 retval = sctp_process_init(init_cp, stcb); 1744 if (retval < 0) { 1745 if (how_indx < sizeof(asoc->cookie_how)) 1746 asoc->cookie_how[how_indx] = 9; 1747 return (NULL); 1748 } 1749 if (sctp_load_addresses_from_init(stcb, m, 1750 init_offset + sizeof(struct sctp_init_chunk), 1751 initack_offset, sh, init_src)) { 1752 if (how_indx < sizeof(asoc->cookie_how)) 1753 asoc->cookie_how[how_indx] = 10; 1754 return (NULL); 1755 } 1756 if ((asoc->state & SCTP_STATE_COOKIE_WAIT) || 1757 (asoc->state & SCTP_STATE_COOKIE_ECHOED)) { 1758 *notification = SCTP_NOTIFY_ASSOC_UP; 1759 1760 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1761 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1762 (inp->sctp_socket->so_qlimit == 0)) { 1763 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1764 struct socket *so; 1765 1766 #endif 1767 stcb->sctp_ep->sctp_flags |= 1768 SCTP_PCB_FLAGS_CONNECTED; 1769 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1770 so = SCTP_INP_SO(stcb->sctp_ep); 1771 atomic_add_int(&stcb->asoc.refcnt, 1); 1772 SCTP_TCB_UNLOCK(stcb); 1773 SCTP_SOCKET_LOCK(so, 1); 1774 SCTP_TCB_LOCK(stcb); 1775 atomic_add_int(&stcb->asoc.refcnt, -1); 1776 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1777 SCTP_SOCKET_UNLOCK(so, 1); 1778 return (NULL); 1779 } 1780 #endif 1781 soisconnected(stcb->sctp_socket); 1782 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1783 SCTP_SOCKET_UNLOCK(so, 1); 1784 #endif 1785 } 1786 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) 1787 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1788 else 1789 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1790 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1791 } else if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) { 1792 SCTP_STAT_INCR_COUNTER32(sctps_restartestab); 1793 } else { 1794 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1795 } 1796 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1797 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1798 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1799 stcb->sctp_ep, stcb, asoc->primary_destination); 1800 } 1801 sctp_stop_all_cookie_timers(stcb); 1802 sctp_toss_old_cookies(stcb, asoc); 1803 sctp_send_cookie_ack(stcb); 1804 if (spec_flag) { 1805 /* 1806 * only if we have retrans set do we do this. What 1807 * this call does is get only the COOKIE-ACK out and 1808 * then when we return the normal call to 1809 * sctp_chunk_output will get the retrans out behind 1810 * this. 1811 */ 1812 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED); 1813 } 1814 if (how_indx < sizeof(asoc->cookie_how)) 1815 asoc->cookie_how[how_indx] = 11; 1816 1817 return (stcb); 1818 } 1819 if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1820 ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) && 1821 cookie->tie_tag_my_vtag == asoc->my_vtag_nonce && 1822 cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce && 1823 cookie->tie_tag_peer_vtag != 0) { 1824 struct sctpasochead *head; 1825 1826 if (asoc->peer_supports_nat) { 1827 /* 1828 * This is a gross gross hack. just call the 1829 * cookie_new code since we are allowing a duplicate 1830 * association. I hope this works... 1831 */ 1832 return (sctp_process_cookie_new(m, iphlen, offset, sh, cookie, cookie_len, 1833 inp, netp, init_src, notification, 1834 auth_skipped, auth_offset, auth_len, 1835 vrf_id, port)); 1836 } 1837 /* 1838 * case A in Section 5.2.4 Table 2: XXMM (peer restarted) 1839 */ 1840 /* temp code */ 1841 if (how_indx < sizeof(asoc->cookie_how)) 1842 asoc->cookie_how[how_indx] = 12; 1843 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_15); 1844 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 1845 1846 /* notify upper layer */ 1847 *notification = SCTP_NOTIFY_ASSOC_RESTART; 1848 atomic_add_int(&stcb->asoc.refcnt, 1); 1849 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_OPEN) && 1850 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) && 1851 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) { 1852 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1853 } 1854 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) { 1855 SCTP_STAT_INCR_GAUGE32(sctps_restartestab); 1856 } else if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) { 1857 SCTP_STAT_INCR_GAUGE32(sctps_collisionestab); 1858 } 1859 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1860 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1861 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1862 stcb->sctp_ep, stcb, asoc->primary_destination); 1863 1864 } else if (!(asoc->state & SCTP_STATE_SHUTDOWN_SENT)) { 1865 /* move to OPEN state, if not in SHUTDOWN_SENT */ 1866 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1867 } 1868 asoc->pre_open_streams = 1869 ntohs(initack_cp->init.num_outbound_streams); 1870 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 1871 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 1872 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 1873 1874 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 1875 1876 asoc->str_reset_seq_in = asoc->init_seq_number; 1877 1878 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 1879 if (asoc->mapping_array) { 1880 memset(asoc->mapping_array, 0, 1881 asoc->mapping_array_size); 1882 } 1883 if (asoc->nr_mapping_array) { 1884 memset(asoc->nr_mapping_array, 0, 1885 asoc->mapping_array_size); 1886 } 1887 SCTP_TCB_UNLOCK(stcb); 1888 SCTP_INP_INFO_WLOCK(); 1889 SCTP_INP_WLOCK(stcb->sctp_ep); 1890 SCTP_TCB_LOCK(stcb); 1891 atomic_add_int(&stcb->asoc.refcnt, -1); 1892 /* send up all the data */ 1893 SCTP_TCB_SEND_LOCK(stcb); 1894 1895 sctp_report_all_outbound(stcb, 0, 1, SCTP_SO_NOT_LOCKED); 1896 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 1897 stcb->asoc.strmout[i].stream_no = i; 1898 stcb->asoc.strmout[i].next_sequence_sent = 0; 1899 stcb->asoc.strmout[i].last_msg_incomplete = 0; 1900 } 1901 /* process the INIT-ACK info (my info) */ 1902 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 1903 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1904 1905 /* pull from vtag hash */ 1906 LIST_REMOVE(stcb, sctp_asocs); 1907 /* re-insert to new vtag position */ 1908 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, 1909 SCTP_BASE_INFO(hashasocmark))]; 1910 /* 1911 * put it in the bucket in the vtag hash of assoc's for the 1912 * system 1913 */ 1914 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 1915 1916 /* process the INIT info (peer's info) */ 1917 SCTP_TCB_SEND_UNLOCK(stcb); 1918 SCTP_INP_WUNLOCK(stcb->sctp_ep); 1919 SCTP_INP_INFO_WUNLOCK(); 1920 1921 retval = sctp_process_init(init_cp, stcb); 1922 if (retval < 0) { 1923 if (how_indx < sizeof(asoc->cookie_how)) 1924 asoc->cookie_how[how_indx] = 13; 1925 1926 return (NULL); 1927 } 1928 /* 1929 * since we did not send a HB make sure we don't double 1930 * things 1931 */ 1932 net->hb_responded = 1; 1933 1934 if (sctp_load_addresses_from_init(stcb, m, 1935 init_offset + sizeof(struct sctp_init_chunk), 1936 initack_offset, sh, init_src)) { 1937 if (how_indx < sizeof(asoc->cookie_how)) 1938 asoc->cookie_how[how_indx] = 14; 1939 1940 return (NULL); 1941 } 1942 /* respond with a COOKIE-ACK */ 1943 sctp_stop_all_cookie_timers(stcb); 1944 sctp_toss_old_cookies(stcb, asoc); 1945 sctp_send_cookie_ack(stcb); 1946 if (how_indx < sizeof(asoc->cookie_how)) 1947 asoc->cookie_how[how_indx] = 15; 1948 1949 return (stcb); 1950 } 1951 if (how_indx < sizeof(asoc->cookie_how)) 1952 asoc->cookie_how[how_indx] = 16; 1953 /* all other cases... */ 1954 return (NULL); 1955 } 1956 1957 1958 /* 1959 * handle a state cookie for a new association m: input packet mbuf chain-- 1960 * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf 1961 * and the cookie signature does not exist offset: offset into mbuf to the 1962 * cookie-echo chunk length: length of the cookie chunk to: where the init 1963 * was from returns a new TCB 1964 */ 1965 struct sctp_tcb * 1966 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1967 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1968 struct sctp_inpcb *inp, struct sctp_nets **netp, 1969 struct sockaddr *init_src, int *notification, 1970 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1971 uint32_t vrf_id, uint16_t port) 1972 { 1973 struct sctp_tcb *stcb; 1974 struct sctp_init_chunk *init_cp, init_buf; 1975 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1976 struct sockaddr_storage sa_store; 1977 struct sockaddr *initack_src = (struct sockaddr *)&sa_store; 1978 struct sctp_association *asoc; 1979 int init_offset, initack_offset, initack_limit; 1980 int retval; 1981 int error = 0; 1982 uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE]; 1983 1984 #ifdef INET 1985 struct sockaddr_in *sin; 1986 1987 #endif 1988 #ifdef INET6 1989 struct sockaddr_in6 *sin6; 1990 1991 #endif 1992 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1993 struct socket *so; 1994 1995 so = SCTP_INP_SO(inp); 1996 #endif 1997 1998 /* 1999 * find and validate the INIT chunk in the cookie (peer's info) the 2000 * INIT should start after the cookie-echo header struct (chunk 2001 * header, state cookie header struct) 2002 */ 2003 init_offset = offset + sizeof(struct sctp_cookie_echo_chunk); 2004 init_cp = (struct sctp_init_chunk *) 2005 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 2006 (uint8_t *) & init_buf); 2007 if (init_cp == NULL) { 2008 /* could not pull a INIT chunk in cookie */ 2009 SCTPDBG(SCTP_DEBUG_INPUT1, 2010 "process_cookie_new: could not pull INIT chunk hdr\n"); 2011 return (NULL); 2012 } 2013 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 2014 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n"); 2015 return (NULL); 2016 } 2017 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 2018 /* 2019 * find and validate the INIT-ACK chunk in the cookie (my info) the 2020 * INIT-ACK follows the INIT chunk 2021 */ 2022 initack_cp = (struct sctp_init_ack_chunk *) 2023 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 2024 (uint8_t *) & initack_buf); 2025 if (initack_cp == NULL) { 2026 /* could not pull INIT-ACK chunk in cookie */ 2027 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n"); 2028 return (NULL); 2029 } 2030 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 2031 return (NULL); 2032 } 2033 /* 2034 * NOTE: We can't use the INIT_ACK's chk_length to determine the 2035 * "initack_limit" value. This is because the chk_length field 2036 * includes the length of the cookie, but the cookie is omitted when 2037 * the INIT and INIT_ACK are tacked onto the cookie... 2038 */ 2039 initack_limit = offset + cookie_len; 2040 2041 /* 2042 * now that we know the INIT/INIT-ACK are in place, create a new TCB 2043 * and popluate 2044 */ 2045 2046 /* 2047 * Here we do a trick, we set in NULL for the proc/thread argument. 2048 * We do this since in effect we only use the p argument when the 2049 * socket is unbound and we must do an implicit bind. Since we are 2050 * getting a cookie, we cannot be unbound. 2051 */ 2052 stcb = sctp_aloc_assoc(inp, init_src, &error, 2053 ntohl(initack_cp->init.initiate_tag), vrf_id, 2054 (struct thread *)NULL 2055 ); 2056 if (stcb == NULL) { 2057 struct mbuf *op_err; 2058 2059 /* memory problem? */ 2060 SCTPDBG(SCTP_DEBUG_INPUT1, 2061 "process_cookie_new: no room for another TCB!\n"); 2062 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC); 2063 2064 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2065 sh, op_err, vrf_id, port); 2066 return (NULL); 2067 } 2068 /* get the correct sctp_nets */ 2069 if (netp) 2070 *netp = sctp_findnet(stcb, init_src); 2071 2072 asoc = &stcb->asoc; 2073 /* get scope variables out of cookie */ 2074 asoc->ipv4_local_scope = cookie->ipv4_scope; 2075 asoc->site_scope = cookie->site_scope; 2076 asoc->local_scope = cookie->local_scope; 2077 asoc->loopback_scope = cookie->loopback_scope; 2078 2079 if ((asoc->ipv4_addr_legal != cookie->ipv4_addr_legal) || 2080 (asoc->ipv6_addr_legal != cookie->ipv6_addr_legal)) { 2081 struct mbuf *op_err; 2082 2083 /* 2084 * Houston we have a problem. The EP changed while the 2085 * cookie was in flight. Only recourse is to abort the 2086 * association. 2087 */ 2088 atomic_add_int(&stcb->asoc.refcnt, 1); 2089 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC); 2090 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2091 sh, op_err, vrf_id, port); 2092 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2093 SCTP_TCB_UNLOCK(stcb); 2094 SCTP_SOCKET_LOCK(so, 1); 2095 SCTP_TCB_LOCK(stcb); 2096 #endif 2097 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2098 SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 2099 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2100 SCTP_SOCKET_UNLOCK(so, 1); 2101 #endif 2102 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2103 return (NULL); 2104 } 2105 /* process the INIT-ACK info (my info) */ 2106 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 2107 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 2108 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 2109 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 2110 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 2111 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 2112 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 2113 asoc->str_reset_seq_in = asoc->init_seq_number; 2114 2115 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 2116 2117 /* process the INIT info (peer's info) */ 2118 if (netp) 2119 retval = sctp_process_init(init_cp, stcb); 2120 else 2121 retval = 0; 2122 if (retval < 0) { 2123 atomic_add_int(&stcb->asoc.refcnt, 1); 2124 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2125 SCTP_TCB_UNLOCK(stcb); 2126 SCTP_SOCKET_LOCK(so, 1); 2127 SCTP_TCB_LOCK(stcb); 2128 #endif 2129 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 2130 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2131 SCTP_SOCKET_UNLOCK(so, 1); 2132 #endif 2133 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2134 return (NULL); 2135 } 2136 /* load all addresses */ 2137 if (sctp_load_addresses_from_init(stcb, m, 2138 init_offset + sizeof(struct sctp_init_chunk), initack_offset, sh, 2139 init_src)) { 2140 atomic_add_int(&stcb->asoc.refcnt, 1); 2141 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2142 SCTP_TCB_UNLOCK(stcb); 2143 SCTP_SOCKET_LOCK(so, 1); 2144 SCTP_TCB_LOCK(stcb); 2145 #endif 2146 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_17); 2147 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2148 SCTP_SOCKET_UNLOCK(so, 1); 2149 #endif 2150 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2151 return (NULL); 2152 } 2153 /* 2154 * verify any preceding AUTH chunk that was skipped 2155 */ 2156 /* pull the local authentication parameters from the cookie/init-ack */ 2157 sctp_auth_get_cookie_params(stcb, m, 2158 initack_offset + sizeof(struct sctp_init_ack_chunk), 2159 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk))); 2160 if (auth_skipped) { 2161 struct sctp_auth_chunk *auth; 2162 2163 auth = (struct sctp_auth_chunk *) 2164 sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf); 2165 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) { 2166 /* auth HMAC failed, dump the assoc and packet */ 2167 SCTPDBG(SCTP_DEBUG_AUTH1, 2168 "COOKIE-ECHO: AUTH failed\n"); 2169 atomic_add_int(&stcb->asoc.refcnt, 1); 2170 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2171 SCTP_TCB_UNLOCK(stcb); 2172 SCTP_SOCKET_LOCK(so, 1); 2173 SCTP_TCB_LOCK(stcb); 2174 #endif 2175 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_18); 2176 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2177 SCTP_SOCKET_UNLOCK(so, 1); 2178 #endif 2179 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2180 return (NULL); 2181 } else { 2182 /* remaining chunks checked... good to go */ 2183 stcb->asoc.authenticated = 1; 2184 } 2185 } 2186 /* update current state */ 2187 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2188 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 2189 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2190 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2191 stcb->sctp_ep, stcb, asoc->primary_destination); 2192 } 2193 sctp_stop_all_cookie_timers(stcb); 2194 SCTP_STAT_INCR_COUNTER32(sctps_passiveestab); 2195 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2196 2197 /* 2198 * if we're doing ASCONFs, check to see if we have any new local 2199 * addresses that need to get added to the peer (eg. addresses 2200 * changed while cookie echo in flight). This needs to be done 2201 * after we go to the OPEN state to do the correct asconf 2202 * processing. else, make sure we have the correct addresses in our 2203 * lists 2204 */ 2205 2206 /* warning, we re-use sin, sin6, sa_store here! */ 2207 /* pull in local_address (our "from" address) */ 2208 switch (cookie->laddr_type) { 2209 #ifdef INET 2210 case SCTP_IPV4_ADDRESS: 2211 /* source addr is IPv4 */ 2212 sin = (struct sockaddr_in *)initack_src; 2213 memset(sin, 0, sizeof(*sin)); 2214 sin->sin_family = AF_INET; 2215 sin->sin_len = sizeof(struct sockaddr_in); 2216 sin->sin_addr.s_addr = cookie->laddress[0]; 2217 break; 2218 #endif 2219 #ifdef INET6 2220 case SCTP_IPV6_ADDRESS: 2221 /* source addr is IPv6 */ 2222 sin6 = (struct sockaddr_in6 *)initack_src; 2223 memset(sin6, 0, sizeof(*sin6)); 2224 sin6->sin6_family = AF_INET6; 2225 sin6->sin6_len = sizeof(struct sockaddr_in6); 2226 sin6->sin6_scope_id = cookie->scope_id; 2227 memcpy(&sin6->sin6_addr, cookie->laddress, 2228 sizeof(sin6->sin6_addr)); 2229 break; 2230 #endif 2231 default: 2232 atomic_add_int(&stcb->asoc.refcnt, 1); 2233 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2234 SCTP_TCB_UNLOCK(stcb); 2235 SCTP_SOCKET_LOCK(so, 1); 2236 SCTP_TCB_LOCK(stcb); 2237 #endif 2238 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 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 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2243 return (NULL); 2244 } 2245 2246 /* set up to notify upper layer */ 2247 *notification = SCTP_NOTIFY_ASSOC_UP; 2248 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2249 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 2250 (inp->sctp_socket->so_qlimit == 0)) { 2251 /* 2252 * This is an endpoint that called connect() how it got a 2253 * cookie that is NEW is a bit of a mystery. It must be that 2254 * the INIT was sent, but before it got there.. a complete 2255 * INIT/INIT-ACK/COOKIE arrived. But of course then it 2256 * should have went to the other code.. not here.. oh well.. 2257 * a bit of protection is worth having.. 2258 */ 2259 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2260 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2261 atomic_add_int(&stcb->asoc.refcnt, 1); 2262 SCTP_TCB_UNLOCK(stcb); 2263 SCTP_SOCKET_LOCK(so, 1); 2264 SCTP_TCB_LOCK(stcb); 2265 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2266 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2267 SCTP_SOCKET_UNLOCK(so, 1); 2268 return (NULL); 2269 } 2270 #endif 2271 soisconnected(stcb->sctp_socket); 2272 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2273 SCTP_SOCKET_UNLOCK(so, 1); 2274 #endif 2275 } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 2276 (inp->sctp_socket->so_qlimit)) { 2277 /* 2278 * We don't want to do anything with this one. Since it is 2279 * the listening guy. The timer will get started for 2280 * accepted connections in the caller. 2281 */ 2282 ; 2283 } 2284 /* since we did not send a HB make sure we don't double things */ 2285 if ((netp) && (*netp)) 2286 (*netp)->hb_responded = 1; 2287 2288 if (stcb->asoc.sctp_autoclose_ticks && 2289 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2290 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL); 2291 } 2292 /* calculate the RTT */ 2293 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 2294 if ((netp) && (*netp)) { 2295 (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp, 2296 &cookie->time_entered, sctp_align_unsafe_makecopy, 2297 SCTP_RTT_FROM_NON_DATA); 2298 } 2299 /* respond with a COOKIE-ACK */ 2300 sctp_send_cookie_ack(stcb); 2301 2302 /* 2303 * check the address lists for any ASCONFs that need to be sent 2304 * AFTER the cookie-ack is sent 2305 */ 2306 sctp_check_address_list(stcb, m, 2307 initack_offset + sizeof(struct sctp_init_ack_chunk), 2308 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)), 2309 initack_src, cookie->local_scope, cookie->site_scope, 2310 cookie->ipv4_scope, cookie->loopback_scope); 2311 2312 2313 return (stcb); 2314 } 2315 2316 /* 2317 * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e 2318 * we NEED to make sure we are not already using the vtag. If so we 2319 * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit! 2320 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag, 2321 SCTP_BASE_INFO(hashasocmark))]; 2322 LIST_FOREACH(stcb, head, sctp_asocs) { 2323 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep)) { 2324 -- SEND ABORT - TRY AGAIN -- 2325 } 2326 } 2327 */ 2328 2329 /* 2330 * handles a COOKIE-ECHO message stcb: modified to either a new or left as 2331 * existing (non-NULL) TCB 2332 */ 2333 static struct mbuf * 2334 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset, 2335 struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp, 2336 struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp, 2337 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2338 struct sctp_tcb **locked_tcb, uint32_t vrf_id, uint16_t port) 2339 { 2340 struct sctp_state_cookie *cookie; 2341 struct sctp_tcb *l_stcb = *stcb; 2342 struct sctp_inpcb *l_inp; 2343 struct sockaddr *to; 2344 struct sctp_pcb *ep; 2345 struct mbuf *m_sig; 2346 uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE]; 2347 uint8_t *sig; 2348 uint8_t cookie_ok = 0; 2349 unsigned int size_of_pkt, sig_offset, cookie_offset; 2350 unsigned int cookie_len; 2351 struct timeval now; 2352 struct timeval time_expires; 2353 struct sockaddr_storage dest_store; 2354 struct sockaddr *localep_sa = (struct sockaddr *)&dest_store; 2355 struct ip *iph; 2356 int notification = 0; 2357 struct sctp_nets *netl; 2358 int had_a_existing_tcb = 0; 2359 int send_int_conf = 0; 2360 2361 #ifdef INET 2362 struct sockaddr_in sin; 2363 2364 #endif 2365 #ifdef INET6 2366 struct sockaddr_in6 sin6; 2367 2368 #endif 2369 2370 SCTPDBG(SCTP_DEBUG_INPUT2, 2371 "sctp_handle_cookie: handling COOKIE-ECHO\n"); 2372 2373 if (inp_p == NULL) { 2374 return (NULL); 2375 } 2376 /* First get the destination address setup too. */ 2377 iph = mtod(m, struct ip *); 2378 switch (iph->ip_v) { 2379 #ifdef INET 2380 case IPVERSION: 2381 { 2382 /* its IPv4 */ 2383 struct sockaddr_in *lsin; 2384 2385 lsin = (struct sockaddr_in *)(localep_sa); 2386 memset(lsin, 0, sizeof(*lsin)); 2387 lsin->sin_family = AF_INET; 2388 lsin->sin_len = sizeof(*lsin); 2389 lsin->sin_port = sh->dest_port; 2390 lsin->sin_addr.s_addr = iph->ip_dst.s_addr; 2391 size_of_pkt = SCTP_GET_IPV4_LENGTH(iph); 2392 break; 2393 } 2394 #endif 2395 #ifdef INET6 2396 case IPV6_VERSION >> 4: 2397 { 2398 /* its IPv6 */ 2399 struct ip6_hdr *ip6; 2400 struct sockaddr_in6 *lsin6; 2401 2402 lsin6 = (struct sockaddr_in6 *)(localep_sa); 2403 memset(lsin6, 0, sizeof(*lsin6)); 2404 lsin6->sin6_family = AF_INET6; 2405 lsin6->sin6_len = sizeof(struct sockaddr_in6); 2406 ip6 = mtod(m, struct ip6_hdr *); 2407 lsin6->sin6_port = sh->dest_port; 2408 lsin6->sin6_addr = ip6->ip6_dst; 2409 size_of_pkt = SCTP_GET_IPV6_LENGTH(ip6) + iphlen; 2410 break; 2411 } 2412 #endif 2413 default: 2414 return (NULL); 2415 } 2416 2417 cookie = &cp->cookie; 2418 cookie_offset = offset + sizeof(struct sctp_chunkhdr); 2419 cookie_len = ntohs(cp->ch.chunk_length); 2420 2421 if ((cookie->peerport != sh->src_port) && 2422 (cookie->myport != sh->dest_port) && 2423 (cookie->my_vtag != sh->v_tag)) { 2424 /* 2425 * invalid ports or bad tag. Note that we always leave the 2426 * v_tag in the header in network order and when we stored 2427 * it in the my_vtag slot we also left it in network order. 2428 * This maintains the match even though it may be in the 2429 * opposite byte order of the machine :-> 2430 */ 2431 return (NULL); 2432 } 2433 if (cookie_len > size_of_pkt || 2434 cookie_len < sizeof(struct sctp_cookie_echo_chunk) + 2435 sizeof(struct sctp_init_chunk) + 2436 sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) { 2437 /* cookie too long! or too small */ 2438 return (NULL); 2439 } 2440 /* 2441 * split off the signature into its own mbuf (since it should not be 2442 * calculated in the sctp_hmac_m() call). 2443 */ 2444 sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE; 2445 if (sig_offset > size_of_pkt) { 2446 /* packet not correct size! */ 2447 /* XXX this may already be accounted for earlier... */ 2448 return (NULL); 2449 } 2450 m_sig = m_split(m, sig_offset, M_DONTWAIT); 2451 if (m_sig == NULL) { 2452 /* out of memory or ?? */ 2453 return (NULL); 2454 } 2455 #ifdef SCTP_MBUF_LOGGING 2456 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 2457 struct mbuf *mat; 2458 2459 for (mat = m_sig; mat; mat = SCTP_BUF_NEXT(mat)) { 2460 if (SCTP_BUF_IS_EXTENDED(mat)) { 2461 sctp_log_mb(mat, SCTP_MBUF_SPLIT); 2462 } 2463 } 2464 } 2465 #endif 2466 2467 /* 2468 * compute the signature/digest for the cookie 2469 */ 2470 ep = &(*inp_p)->sctp_ep; 2471 l_inp = *inp_p; 2472 if (l_stcb) { 2473 SCTP_TCB_UNLOCK(l_stcb); 2474 } 2475 SCTP_INP_RLOCK(l_inp); 2476 if (l_stcb) { 2477 SCTP_TCB_LOCK(l_stcb); 2478 } 2479 /* which cookie is it? */ 2480 if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) && 2481 (ep->current_secret_number != ep->last_secret_number)) { 2482 /* it's the old cookie */ 2483 (void)sctp_hmac_m(SCTP_HMAC, 2484 (uint8_t *) ep->secret_key[(int)ep->last_secret_number], 2485 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2486 } else { 2487 /* it's the current cookie */ 2488 (void)sctp_hmac_m(SCTP_HMAC, 2489 (uint8_t *) ep->secret_key[(int)ep->current_secret_number], 2490 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2491 } 2492 /* get the signature */ 2493 SCTP_INP_RUNLOCK(l_inp); 2494 sig = (uint8_t *) sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *) & tmp_sig); 2495 if (sig == NULL) { 2496 /* couldn't find signature */ 2497 sctp_m_freem(m_sig); 2498 return (NULL); 2499 } 2500 /* compare the received digest with the computed digest */ 2501 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) { 2502 /* try the old cookie? */ 2503 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) && 2504 (ep->current_secret_number != ep->last_secret_number)) { 2505 /* compute digest with old */ 2506 (void)sctp_hmac_m(SCTP_HMAC, 2507 (uint8_t *) ep->secret_key[(int)ep->last_secret_number], 2508 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2509 /* compare */ 2510 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0) 2511 cookie_ok = 1; 2512 } 2513 } else { 2514 cookie_ok = 1; 2515 } 2516 2517 /* 2518 * Now before we continue we must reconstruct our mbuf so that 2519 * normal processing of any other chunks will work. 2520 */ 2521 { 2522 struct mbuf *m_at; 2523 2524 m_at = m; 2525 while (SCTP_BUF_NEXT(m_at) != NULL) { 2526 m_at = SCTP_BUF_NEXT(m_at); 2527 } 2528 SCTP_BUF_NEXT(m_at) = m_sig; 2529 } 2530 2531 if (cookie_ok == 0) { 2532 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n"); 2533 SCTPDBG(SCTP_DEBUG_INPUT2, 2534 "offset = %u, cookie_offset = %u, sig_offset = %u\n", 2535 (uint32_t) offset, cookie_offset, sig_offset); 2536 return (NULL); 2537 } 2538 /* 2539 * check the cookie timestamps to be sure it's not stale 2540 */ 2541 (void)SCTP_GETTIME_TIMEVAL(&now); 2542 /* Expire time is in Ticks, so we convert to seconds */ 2543 time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life); 2544 time_expires.tv_usec = cookie->time_entered.tv_usec; 2545 /* 2546 * TODO sctp_constants.h needs alternative time macros when _KERNEL 2547 * is undefined. 2548 */ 2549 if (timevalcmp(&now, &time_expires, >)) { 2550 /* cookie is stale! */ 2551 struct mbuf *op_err; 2552 struct sctp_stale_cookie_msg *scm; 2553 uint32_t tim; 2554 2555 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_stale_cookie_msg), 2556 0, M_DONTWAIT, 1, MT_DATA); 2557 if (op_err == NULL) { 2558 /* FOOBAR */ 2559 return (NULL); 2560 } 2561 /* Set the len */ 2562 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_stale_cookie_msg); 2563 scm = mtod(op_err, struct sctp_stale_cookie_msg *); 2564 scm->ph.param_type = htons(SCTP_CAUSE_STALE_COOKIE); 2565 scm->ph.param_length = htons((sizeof(struct sctp_paramhdr) + 2566 (sizeof(uint32_t)))); 2567 /* seconds to usec */ 2568 tim = (now.tv_sec - time_expires.tv_sec) * 1000000; 2569 /* add in usec */ 2570 if (tim == 0) 2571 tim = now.tv_usec - cookie->time_entered.tv_usec; 2572 scm->time_usec = htonl(tim); 2573 sctp_send_operr_to(m, iphlen, op_err, cookie->peers_vtag, 2574 vrf_id, port); 2575 return (NULL); 2576 } 2577 /* 2578 * Now we must see with the lookup address if we have an existing 2579 * asoc. This will only happen if we were in the COOKIE-WAIT state 2580 * and a INIT collided with us and somewhere the peer sent the 2581 * cookie on another address besides the single address our assoc 2582 * had for him. In this case we will have one of the tie-tags set at 2583 * least AND the address field in the cookie can be used to look it 2584 * up. 2585 */ 2586 to = NULL; 2587 switch (cookie->addr_type) { 2588 #ifdef INET6 2589 case SCTP_IPV6_ADDRESS: 2590 memset(&sin6, 0, sizeof(sin6)); 2591 sin6.sin6_family = AF_INET6; 2592 sin6.sin6_len = sizeof(sin6); 2593 sin6.sin6_port = sh->src_port; 2594 sin6.sin6_scope_id = cookie->scope_id; 2595 memcpy(&sin6.sin6_addr.s6_addr, cookie->address, 2596 sizeof(sin6.sin6_addr.s6_addr)); 2597 to = (struct sockaddr *)&sin6; 2598 break; 2599 #endif 2600 #ifdef INET 2601 case SCTP_IPV4_ADDRESS: 2602 memset(&sin, 0, sizeof(sin)); 2603 sin.sin_family = AF_INET; 2604 sin.sin_len = sizeof(sin); 2605 sin.sin_port = sh->src_port; 2606 sin.sin_addr.s_addr = cookie->address[0]; 2607 to = (struct sockaddr *)&sin; 2608 break; 2609 #endif 2610 default: 2611 /* This should not happen */ 2612 return (NULL); 2613 } 2614 if ((*stcb == NULL) && to) { 2615 /* Yep, lets check */ 2616 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, localep_sa, NULL); 2617 if (*stcb == NULL) { 2618 /* 2619 * We should have only got back the same inp. If we 2620 * got back a different ep we have a problem. The 2621 * original findep got back l_inp and now 2622 */ 2623 if (l_inp != *inp_p) { 2624 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n"); 2625 } 2626 } else { 2627 if (*locked_tcb == NULL) { 2628 /* 2629 * In this case we found the assoc only 2630 * after we locked the create lock. This 2631 * means we are in a colliding case and we 2632 * must make sure that we unlock the tcb if 2633 * its one of the cases where we throw away 2634 * the incoming packets. 2635 */ 2636 *locked_tcb = *stcb; 2637 2638 /* 2639 * We must also increment the inp ref count 2640 * since the ref_count flags was set when we 2641 * did not find the TCB, now we found it 2642 * which reduces the refcount.. we must 2643 * raise it back out to balance it all :-) 2644 */ 2645 SCTP_INP_INCR_REF((*stcb)->sctp_ep); 2646 if ((*stcb)->sctp_ep != l_inp) { 2647 SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n", 2648 (*stcb)->sctp_ep, l_inp); 2649 } 2650 } 2651 } 2652 } 2653 if (to == NULL) { 2654 return (NULL); 2655 } 2656 cookie_len -= SCTP_SIGNATURE_SIZE; 2657 if (*stcb == NULL) { 2658 /* this is the "normal" case... get a new TCB */ 2659 *stcb = sctp_process_cookie_new(m, iphlen, offset, sh, cookie, 2660 cookie_len, *inp_p, netp, to, ¬ification, 2661 auth_skipped, auth_offset, auth_len, vrf_id, port); 2662 } else { 2663 /* this is abnormal... cookie-echo on existing TCB */ 2664 had_a_existing_tcb = 1; 2665 *stcb = sctp_process_cookie_existing(m, iphlen, offset, sh, 2666 cookie, cookie_len, *inp_p, *stcb, netp, to, 2667 ¬ification, vrf_id, auth_skipped, auth_offset, auth_len, port); 2668 } 2669 2670 if (*stcb == NULL) { 2671 /* still no TCB... must be bad cookie-echo */ 2672 return (NULL); 2673 } 2674 if ((*netp != NULL) && (m->m_flags & M_FLOWID)) { 2675 (*netp)->flowid = m->m_pkthdr.flowid; 2676 #ifdef INVARIANTS 2677 (*netp)->flowidset = 1; 2678 #endif 2679 } 2680 /* 2681 * Ok, we built an association so confirm the address we sent the 2682 * INIT-ACK to. 2683 */ 2684 netl = sctp_findnet(*stcb, to); 2685 /* 2686 * This code should in theory NOT run but 2687 */ 2688 if (netl == NULL) { 2689 /* TSNH! Huh, why do I need to add this address here? */ 2690 if (sctp_add_remote_addr(*stcb, to, NULL, SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) { 2691 return (NULL); 2692 } 2693 netl = sctp_findnet(*stcb, to); 2694 } 2695 if (netl) { 2696 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) { 2697 netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 2698 (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL, 2699 netl); 2700 send_int_conf = 1; 2701 } 2702 } 2703 sctp_start_net_timers(*stcb); 2704 if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) { 2705 if (!had_a_existing_tcb || 2706 (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) { 2707 /* 2708 * If we have a NEW cookie or the connect never 2709 * reached the connected state during collision we 2710 * must do the TCP accept thing. 2711 */ 2712 struct socket *so, *oso; 2713 struct sctp_inpcb *inp; 2714 2715 if (notification == SCTP_NOTIFY_ASSOC_RESTART) { 2716 /* 2717 * For a restart we will keep the same 2718 * socket, no need to do anything. I THINK!! 2719 */ 2720 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2721 if (send_int_conf) { 2722 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2723 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2724 } 2725 return (m); 2726 } 2727 oso = (*inp_p)->sctp_socket; 2728 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2729 SCTP_TCB_UNLOCK((*stcb)); 2730 CURVNET_SET(oso->so_vnet); 2731 so = sonewconn(oso, 0 2732 ); 2733 CURVNET_RESTORE(); 2734 SCTP_TCB_LOCK((*stcb)); 2735 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2736 2737 if (so == NULL) { 2738 struct mbuf *op_err; 2739 2740 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2741 struct socket *pcb_so; 2742 2743 #endif 2744 /* Too many sockets */ 2745 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n"); 2746 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC); 2747 sctp_abort_association(*inp_p, NULL, m, iphlen, 2748 sh, op_err, vrf_id, port); 2749 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2750 pcb_so = SCTP_INP_SO(*inp_p); 2751 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2752 SCTP_TCB_UNLOCK((*stcb)); 2753 SCTP_SOCKET_LOCK(pcb_so, 1); 2754 SCTP_TCB_LOCK((*stcb)); 2755 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2756 #endif 2757 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_20); 2758 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2759 SCTP_SOCKET_UNLOCK(pcb_so, 1); 2760 #endif 2761 return (NULL); 2762 } 2763 inp = (struct sctp_inpcb *)so->so_pcb; 2764 SCTP_INP_INCR_REF(inp); 2765 /* 2766 * We add the unbound flag here so that if we get an 2767 * soabort() before we get the move_pcb done, we 2768 * will properly cleanup. 2769 */ 2770 inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE | 2771 SCTP_PCB_FLAGS_CONNECTED | 2772 SCTP_PCB_FLAGS_IN_TCPPOOL | 2773 SCTP_PCB_FLAGS_UNBOUND | 2774 (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) | 2775 SCTP_PCB_FLAGS_DONT_WAKE); 2776 inp->sctp_features = (*inp_p)->sctp_features; 2777 inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features; 2778 inp->sctp_socket = so; 2779 inp->sctp_frag_point = (*inp_p)->sctp_frag_point; 2780 inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off; 2781 inp->sctp_ecn_enable = (*inp_p)->sctp_ecn_enable; 2782 inp->partial_delivery_point = (*inp_p)->partial_delivery_point; 2783 inp->sctp_context = (*inp_p)->sctp_context; 2784 inp->local_strreset_support = (*inp_p)->local_strreset_support; 2785 inp->inp_starting_point_for_iterator = NULL; 2786 /* 2787 * copy in the authentication parameters from the 2788 * original endpoint 2789 */ 2790 if (inp->sctp_ep.local_hmacs) 2791 sctp_free_hmaclist(inp->sctp_ep.local_hmacs); 2792 inp->sctp_ep.local_hmacs = 2793 sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs); 2794 if (inp->sctp_ep.local_auth_chunks) 2795 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks); 2796 inp->sctp_ep.local_auth_chunks = 2797 sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks); 2798 2799 /* 2800 * Now we must move it from one hash table to 2801 * another and get the tcb in the right place. 2802 */ 2803 2804 /* 2805 * This is where the one-2-one socket is put into 2806 * the accept state waiting for the accept! 2807 */ 2808 if (*stcb) { 2809 (*stcb)->asoc.state |= SCTP_STATE_IN_ACCEPT_QUEUE; 2810 } 2811 sctp_move_pcb_and_assoc(*inp_p, inp, *stcb); 2812 2813 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2814 SCTP_TCB_UNLOCK((*stcb)); 2815 2816 sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb, 2817 0); 2818 SCTP_TCB_LOCK((*stcb)); 2819 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2820 2821 2822 /* 2823 * now we must check to see if we were aborted while 2824 * the move was going on and the lock/unlock 2825 * happened. 2826 */ 2827 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 2828 /* 2829 * yep it was, we leave the assoc attached 2830 * to the socket since the sctp_inpcb_free() 2831 * call will send an abort for us. 2832 */ 2833 SCTP_INP_DECR_REF(inp); 2834 return (NULL); 2835 } 2836 SCTP_INP_DECR_REF(inp); 2837 /* Switch over to the new guy */ 2838 *inp_p = inp; 2839 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2840 if (send_int_conf) { 2841 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2842 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2843 } 2844 /* 2845 * Pull it from the incomplete queue and wake the 2846 * guy 2847 */ 2848 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2849 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2850 SCTP_TCB_UNLOCK((*stcb)); 2851 SCTP_SOCKET_LOCK(so, 1); 2852 #endif 2853 soisconnected(so); 2854 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2855 SCTP_TCB_LOCK((*stcb)); 2856 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2857 SCTP_SOCKET_UNLOCK(so, 1); 2858 #endif 2859 return (m); 2860 } 2861 } 2862 if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE) { 2863 if (notification) { 2864 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2865 } 2866 if (send_int_conf) { 2867 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2868 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2869 } 2870 } 2871 return (m); 2872 } 2873 2874 static void 2875 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED, 2876 struct sctp_tcb *stcb, struct sctp_nets *net) 2877 { 2878 /* cp must not be used, others call this without a c-ack :-) */ 2879 struct sctp_association *asoc; 2880 2881 SCTPDBG(SCTP_DEBUG_INPUT2, 2882 "sctp_handle_cookie_ack: handling COOKIE-ACK\n"); 2883 if (stcb == NULL) 2884 return; 2885 2886 asoc = &stcb->asoc; 2887 2888 sctp_stop_all_cookie_timers(stcb); 2889 /* process according to association state */ 2890 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) { 2891 /* state change only needed when I am in right state */ 2892 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2893 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 2894 sctp_start_net_timers(stcb); 2895 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2896 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2897 stcb->sctp_ep, stcb, asoc->primary_destination); 2898 2899 } 2900 /* update RTO */ 2901 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 2902 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2903 if (asoc->overall_error_count == 0) { 2904 net->RTO = sctp_calculate_rto(stcb, asoc, net, 2905 &asoc->time_entered, sctp_align_safe_nocopy, 2906 SCTP_RTT_FROM_NON_DATA); 2907 } 2908 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 2909 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2910 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2911 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 2912 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2913 struct socket *so; 2914 2915 #endif 2916 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2917 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2918 so = SCTP_INP_SO(stcb->sctp_ep); 2919 atomic_add_int(&stcb->asoc.refcnt, 1); 2920 SCTP_TCB_UNLOCK(stcb); 2921 SCTP_SOCKET_LOCK(so, 1); 2922 SCTP_TCB_LOCK(stcb); 2923 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2924 #endif 2925 if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) { 2926 soisconnected(stcb->sctp_socket); 2927 } 2928 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2929 SCTP_SOCKET_UNLOCK(so, 1); 2930 #endif 2931 } 2932 /* 2933 * since we did not send a HB make sure we don't double 2934 * things 2935 */ 2936 net->hb_responded = 1; 2937 2938 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2939 /* 2940 * We don't need to do the asconf thing, nor hb or 2941 * autoclose if the socket is closed. 2942 */ 2943 goto closed_socket; 2944 } 2945 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 2946 stcb, net); 2947 2948 2949 if (stcb->asoc.sctp_autoclose_ticks && 2950 sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2951 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 2952 stcb->sctp_ep, stcb, NULL); 2953 } 2954 /* 2955 * send ASCONF if parameters are pending and ASCONFs are 2956 * allowed (eg. addresses changed when init/cookie echo were 2957 * in flight) 2958 */ 2959 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) && 2960 (stcb->asoc.peer_supports_asconf) && 2961 (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) { 2962 #ifdef SCTP_TIMER_BASED_ASCONF 2963 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, 2964 stcb->sctp_ep, stcb, 2965 stcb->asoc.primary_destination); 2966 #else 2967 sctp_send_asconf(stcb, stcb->asoc.primary_destination, 2968 SCTP_ADDR_NOT_LOCKED); 2969 #endif 2970 } 2971 } 2972 closed_socket: 2973 /* Toss the cookie if I can */ 2974 sctp_toss_old_cookies(stcb, asoc); 2975 if (!TAILQ_EMPTY(&asoc->sent_queue)) { 2976 /* Restart the timer if we have pending data */ 2977 struct sctp_tmit_chunk *chk; 2978 2979 chk = TAILQ_FIRST(&asoc->sent_queue); 2980 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 2981 } 2982 } 2983 2984 static void 2985 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp, 2986 struct sctp_tcb *stcb) 2987 { 2988 struct sctp_nets *net; 2989 struct sctp_tmit_chunk *lchk; 2990 struct sctp_ecne_chunk bkup; 2991 uint8_t override_bit; 2992 uint32_t tsn, window_data_tsn; 2993 int len; 2994 unsigned int pkt_cnt; 2995 2996 len = ntohs(cp->ch.chunk_length); 2997 if ((len != sizeof(struct sctp_ecne_chunk)) && 2998 (len != sizeof(struct old_sctp_ecne_chunk))) { 2999 return; 3000 } 3001 if (len == sizeof(struct old_sctp_ecne_chunk)) { 3002 /* Its the old format */ 3003 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk)); 3004 bkup.num_pkts_since_cwr = htonl(1); 3005 cp = &bkup; 3006 } 3007 SCTP_STAT_INCR(sctps_recvecne); 3008 tsn = ntohl(cp->tsn); 3009 pkt_cnt = ntohl(cp->num_pkts_since_cwr); 3010 lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead); 3011 if (lchk == NULL) { 3012 window_data_tsn = stcb->asoc.sending_seq - 1; 3013 } else { 3014 window_data_tsn = lchk->rec.data.TSN_seq; 3015 } 3016 3017 /* Find where it was sent to if possible. */ 3018 net = NULL; 3019 TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) { 3020 if (lchk->rec.data.TSN_seq == tsn) { 3021 net = lchk->whoTo; 3022 net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send; 3023 break; 3024 } 3025 if (SCTP_TSN_GT(lchk->rec.data.TSN_seq, tsn)) { 3026 break; 3027 } 3028 } 3029 if (net == NULL) { 3030 /* 3031 * What to do. A previous send of a CWR was possibly lost. 3032 * See how old it is, we may have it marked on the actual 3033 * net. 3034 */ 3035 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 3036 if (tsn == net->last_cwr_tsn) { 3037 /* Found him, send it off */ 3038 break; 3039 } 3040 } 3041 if (net == NULL) { 3042 /* 3043 * If we reach here, we need to send a special CWR 3044 * that says hey, we did this a long time ago and 3045 * you lost the response. 3046 */ 3047 net = TAILQ_FIRST(&stcb->asoc.nets); 3048 if (net == NULL) { 3049 /* TSNH */ 3050 return; 3051 } 3052 override_bit = SCTP_CWR_REDUCE_OVERRIDE; 3053 } else { 3054 override_bit = 0; 3055 } 3056 } else { 3057 override_bit = 0; 3058 } 3059 if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) && 3060 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 3061 /* 3062 * JRS - Use the congestion control given in the pluggable 3063 * CC module 3064 */ 3065 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt); 3066 /* 3067 * We reduce once every RTT. So we will only lower cwnd at 3068 * the next sending seq i.e. the window_data_tsn 3069 */ 3070 net->cwr_window_tsn = window_data_tsn; 3071 net->ecn_ce_pkt_cnt += pkt_cnt; 3072 net->lost_cnt = pkt_cnt; 3073 net->last_cwr_tsn = tsn; 3074 } else { 3075 override_bit |= SCTP_CWR_IN_SAME_WINDOW; 3076 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) && 3077 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 3078 /* 3079 * Another loss in the same window update how many 3080 * marks/packets lost we have had. 3081 */ 3082 int cnt = 1; 3083 3084 if (pkt_cnt > net->lost_cnt) { 3085 /* Should be the case */ 3086 cnt = (pkt_cnt - net->lost_cnt); 3087 net->ecn_ce_pkt_cnt += cnt; 3088 } 3089 net->lost_cnt = pkt_cnt; 3090 net->last_cwr_tsn = tsn; 3091 /* 3092 * Most CC functions will ignore this call, since we 3093 * are in-window yet of the initial CE the peer saw. 3094 */ 3095 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt); 3096 } 3097 } 3098 /* 3099 * We always send a CWR this way if our previous one was lost our 3100 * peer will get an update, or if it is not time again to reduce we 3101 * still get the cwr to the peer. Note we set the override when we 3102 * could not find the TSN on the chunk or the destination network. 3103 */ 3104 sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit); 3105 } 3106 3107 static void 3108 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net) 3109 { 3110 /* 3111 * Here we get a CWR from the peer. We must look in the outqueue and 3112 * make sure that we have a covered ECNE in teh control chunk part. 3113 * If so remove it. 3114 */ 3115 struct sctp_tmit_chunk *chk; 3116 struct sctp_ecne_chunk *ecne; 3117 int override; 3118 uint32_t cwr_tsn; 3119 3120 cwr_tsn = ntohl(cp->tsn); 3121 3122 override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE; 3123 TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) { 3124 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) { 3125 continue; 3126 } 3127 if ((override == 0) && (chk->whoTo != net)) { 3128 /* Must be from the right src unless override is set */ 3129 continue; 3130 } 3131 ecne = mtod(chk->data, struct sctp_ecne_chunk *); 3132 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) { 3133 /* this covers this ECNE, we can remove it */ 3134 stcb->asoc.ecn_echo_cnt_onq--; 3135 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, 3136 sctp_next); 3137 if (chk->data) { 3138 sctp_m_freem(chk->data); 3139 chk->data = NULL; 3140 } 3141 stcb->asoc.ctrl_queue_cnt--; 3142 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3143 if (override == 0) { 3144 break; 3145 } 3146 } 3147 } 3148 } 3149 3150 static void 3151 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED, 3152 struct sctp_tcb *stcb, struct sctp_nets *net) 3153 { 3154 struct sctp_association *asoc; 3155 3156 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3157 struct socket *so; 3158 3159 #endif 3160 3161 SCTPDBG(SCTP_DEBUG_INPUT2, 3162 "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n"); 3163 if (stcb == NULL) 3164 return; 3165 3166 asoc = &stcb->asoc; 3167 /* process according to association state */ 3168 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 3169 /* unexpected SHUTDOWN-COMPLETE... so ignore... */ 3170 SCTPDBG(SCTP_DEBUG_INPUT2, 3171 "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n"); 3172 SCTP_TCB_UNLOCK(stcb); 3173 return; 3174 } 3175 /* notify upper layer protocol */ 3176 if (stcb->sctp_socket) { 3177 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 3178 /* are the queues empty? they should be */ 3179 if (!TAILQ_EMPTY(&asoc->send_queue) || 3180 !TAILQ_EMPTY(&asoc->sent_queue) || 3181 !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 3182 sctp_report_all_outbound(stcb, 0, 0, SCTP_SO_NOT_LOCKED); 3183 } 3184 } 3185 /* stop the timer */ 3186 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_22); 3187 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 3188 /* free the TCB */ 3189 SCTPDBG(SCTP_DEBUG_INPUT2, 3190 "sctp_handle_shutdown_complete: calls free-asoc\n"); 3191 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3192 so = SCTP_INP_SO(stcb->sctp_ep); 3193 atomic_add_int(&stcb->asoc.refcnt, 1); 3194 SCTP_TCB_UNLOCK(stcb); 3195 SCTP_SOCKET_LOCK(so, 1); 3196 SCTP_TCB_LOCK(stcb); 3197 atomic_subtract_int(&stcb->asoc.refcnt, 1); 3198 #endif 3199 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_23); 3200 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3201 SCTP_SOCKET_UNLOCK(so, 1); 3202 #endif 3203 return; 3204 } 3205 3206 static int 3207 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc, 3208 struct sctp_nets *net, uint8_t flg) 3209 { 3210 switch (desc->chunk_type) { 3211 case SCTP_DATA: 3212 /* find the tsn to resend (possibly */ 3213 { 3214 uint32_t tsn; 3215 struct sctp_tmit_chunk *tp1; 3216 3217 tsn = ntohl(desc->tsn_ifany); 3218 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3219 if (tp1->rec.data.TSN_seq == tsn) { 3220 /* found it */ 3221 break; 3222 } 3223 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, tsn)) { 3224 /* not found */ 3225 tp1 = NULL; 3226 break; 3227 } 3228 } 3229 if (tp1 == NULL) { 3230 /* 3231 * Do it the other way , aka without paying 3232 * attention to queue seq order. 3233 */ 3234 SCTP_STAT_INCR(sctps_pdrpdnfnd); 3235 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3236 if (tp1->rec.data.TSN_seq == tsn) { 3237 /* found it */ 3238 break; 3239 } 3240 } 3241 } 3242 if (tp1 == NULL) { 3243 SCTP_STAT_INCR(sctps_pdrptsnnf); 3244 } 3245 if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) { 3246 uint8_t *ddp; 3247 3248 if (((flg & SCTP_BADCRC) == 0) && 3249 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3250 return (0); 3251 } 3252 if ((stcb->asoc.peers_rwnd == 0) && 3253 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3254 SCTP_STAT_INCR(sctps_pdrpdiwnp); 3255 return (0); 3256 } 3257 if (stcb->asoc.peers_rwnd == 0 && 3258 (flg & SCTP_FROM_MIDDLE_BOX)) { 3259 SCTP_STAT_INCR(sctps_pdrpdizrw); 3260 return (0); 3261 } 3262 ddp = (uint8_t *) (mtod(tp1->data, caddr_t)+ 3263 sizeof(struct sctp_data_chunk)); 3264 { 3265 unsigned int iii; 3266 3267 for (iii = 0; iii < sizeof(desc->data_bytes); 3268 iii++) { 3269 if (ddp[iii] != desc->data_bytes[iii]) { 3270 SCTP_STAT_INCR(sctps_pdrpbadd); 3271 return (-1); 3272 } 3273 } 3274 } 3275 3276 if (tp1->do_rtt) { 3277 /* 3278 * this guy had a RTO calculation 3279 * pending on it, cancel it 3280 */ 3281 if (tp1->whoTo->rto_needed == 0) { 3282 tp1->whoTo->rto_needed = 1; 3283 } 3284 tp1->do_rtt = 0; 3285 } 3286 SCTP_STAT_INCR(sctps_pdrpmark); 3287 if (tp1->sent != SCTP_DATAGRAM_RESEND) 3288 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3289 /* 3290 * mark it as if we were doing a FR, since 3291 * we will be getting gap ack reports behind 3292 * the info from the router. 3293 */ 3294 tp1->rec.data.doing_fast_retransmit = 1; 3295 /* 3296 * mark the tsn with what sequences can 3297 * cause a new FR. 3298 */ 3299 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) { 3300 tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq; 3301 } else { 3302 tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq; 3303 } 3304 3305 /* restart the timer */ 3306 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3307 stcb, tp1->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_24); 3308 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3309 stcb, tp1->whoTo); 3310 3311 /* fix counts and things */ 3312 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 3313 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP, 3314 tp1->whoTo->flight_size, 3315 tp1->book_size, 3316 (uintptr_t) stcb, 3317 tp1->rec.data.TSN_seq); 3318 } 3319 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3320 sctp_flight_size_decrease(tp1); 3321 sctp_total_flight_decrease(stcb, tp1); 3322 } 3323 tp1->sent = SCTP_DATAGRAM_RESEND; 3324 } { 3325 /* audit code */ 3326 unsigned int audit; 3327 3328 audit = 0; 3329 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3330 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3331 audit++; 3332 } 3333 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue, 3334 sctp_next) { 3335 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3336 audit++; 3337 } 3338 if (audit != stcb->asoc.sent_queue_retran_cnt) { 3339 SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n", 3340 audit, stcb->asoc.sent_queue_retran_cnt); 3341 #ifndef SCTP_AUDITING_ENABLED 3342 stcb->asoc.sent_queue_retran_cnt = audit; 3343 #endif 3344 } 3345 } 3346 } 3347 break; 3348 case SCTP_ASCONF: 3349 { 3350 struct sctp_tmit_chunk *asconf; 3351 3352 TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue, 3353 sctp_next) { 3354 if (asconf->rec.chunk_id.id == SCTP_ASCONF) { 3355 break; 3356 } 3357 } 3358 if (asconf) { 3359 if (asconf->sent != SCTP_DATAGRAM_RESEND) 3360 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3361 asconf->sent = SCTP_DATAGRAM_RESEND; 3362 asconf->snd_count--; 3363 } 3364 } 3365 break; 3366 case SCTP_INITIATION: 3367 /* resend the INIT */ 3368 stcb->asoc.dropped_special_cnt++; 3369 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) { 3370 /* 3371 * If we can get it in, in a few attempts we do 3372 * this, otherwise we let the timer fire. 3373 */ 3374 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, 3375 stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_25); 3376 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 3377 } 3378 break; 3379 case SCTP_SELECTIVE_ACK: 3380 case SCTP_NR_SELECTIVE_ACK: 3381 /* resend the sack */ 3382 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED); 3383 break; 3384 case SCTP_HEARTBEAT_REQUEST: 3385 /* resend a demand HB */ 3386 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) { 3387 /* 3388 * Only retransmit if we KNOW we wont destroy the 3389 * tcb 3390 */ 3391 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 3392 } 3393 break; 3394 case SCTP_SHUTDOWN: 3395 sctp_send_shutdown(stcb, net); 3396 break; 3397 case SCTP_SHUTDOWN_ACK: 3398 sctp_send_shutdown_ack(stcb, net); 3399 break; 3400 case SCTP_COOKIE_ECHO: 3401 { 3402 struct sctp_tmit_chunk *cookie; 3403 3404 cookie = NULL; 3405 TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, 3406 sctp_next) { 3407 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) { 3408 break; 3409 } 3410 } 3411 if (cookie) { 3412 if (cookie->sent != SCTP_DATAGRAM_RESEND) 3413 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3414 cookie->sent = SCTP_DATAGRAM_RESEND; 3415 sctp_stop_all_cookie_timers(stcb); 3416 } 3417 } 3418 break; 3419 case SCTP_COOKIE_ACK: 3420 sctp_send_cookie_ack(stcb); 3421 break; 3422 case SCTP_ASCONF_ACK: 3423 /* resend last asconf ack */ 3424 sctp_send_asconf_ack(stcb); 3425 break; 3426 case SCTP_FORWARD_CUM_TSN: 3427 send_forward_tsn(stcb, &stcb->asoc); 3428 break; 3429 /* can't do anything with these */ 3430 case SCTP_PACKET_DROPPED: 3431 case SCTP_INITIATION_ACK: /* this should not happen */ 3432 case SCTP_HEARTBEAT_ACK: 3433 case SCTP_ABORT_ASSOCIATION: 3434 case SCTP_OPERATION_ERROR: 3435 case SCTP_SHUTDOWN_COMPLETE: 3436 case SCTP_ECN_ECHO: 3437 case SCTP_ECN_CWR: 3438 default: 3439 break; 3440 } 3441 return (0); 3442 } 3443 3444 void 3445 sctp_reset_in_stream(struct sctp_tcb *stcb, int number_entries, uint16_t * list) 3446 { 3447 int i; 3448 uint16_t temp; 3449 3450 /* 3451 * We set things to 0xffff since this is the last delivered sequence 3452 * and we will be sending in 0 after the reset. 3453 */ 3454 3455 if (number_entries) { 3456 for (i = 0; i < number_entries; i++) { 3457 temp = ntohs(list[i]); 3458 if (temp >= stcb->asoc.streamincnt) { 3459 continue; 3460 } 3461 stcb->asoc.strmin[temp].last_sequence_delivered = 0xffff; 3462 } 3463 } else { 3464 list = NULL; 3465 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3466 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff; 3467 } 3468 } 3469 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3470 } 3471 3472 static void 3473 sctp_reset_out_streams(struct sctp_tcb *stcb, int number_entries, uint16_t * list) 3474 { 3475 int i; 3476 3477 if (number_entries == 0) { 3478 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3479 stcb->asoc.strmout[i].next_sequence_sent = 0; 3480 } 3481 } else if (number_entries) { 3482 for (i = 0; i < number_entries; i++) { 3483 uint16_t temp; 3484 3485 temp = ntohs(list[i]); 3486 if (temp >= stcb->asoc.streamoutcnt) { 3487 /* no such stream */ 3488 continue; 3489 } 3490 stcb->asoc.strmout[temp].next_sequence_sent = 0; 3491 } 3492 } 3493 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3494 } 3495 3496 3497 struct sctp_stream_reset_out_request * 3498 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk) 3499 { 3500 struct sctp_association *asoc; 3501 struct sctp_stream_reset_out_req *req; 3502 struct sctp_stream_reset_out_request *r; 3503 struct sctp_tmit_chunk *chk; 3504 int len, clen; 3505 3506 asoc = &stcb->asoc; 3507 if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 3508 asoc->stream_reset_outstanding = 0; 3509 return (NULL); 3510 } 3511 if (stcb->asoc.str_reset == NULL) { 3512 asoc->stream_reset_outstanding = 0; 3513 return (NULL); 3514 } 3515 chk = stcb->asoc.str_reset; 3516 if (chk->data == NULL) { 3517 return (NULL); 3518 } 3519 if (bchk) { 3520 /* he wants a copy of the chk pointer */ 3521 *bchk = chk; 3522 } 3523 clen = chk->send_size; 3524 req = mtod(chk->data, struct sctp_stream_reset_out_req *); 3525 r = &req->sr_req; 3526 if (ntohl(r->request_seq) == seq) { 3527 /* found it */ 3528 return (r); 3529 } 3530 len = SCTP_SIZE32(ntohs(r->ph.param_length)); 3531 if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) { 3532 /* move to the next one, there can only be a max of two */ 3533 r = (struct sctp_stream_reset_out_request *)((caddr_t)r + len); 3534 if (ntohl(r->request_seq) == seq) { 3535 return (r); 3536 } 3537 } 3538 /* that seq is not here */ 3539 return (NULL); 3540 } 3541 3542 static void 3543 sctp_clean_up_stream_reset(struct sctp_tcb *stcb) 3544 { 3545 struct sctp_association *asoc; 3546 struct sctp_tmit_chunk *chk = stcb->asoc.str_reset; 3547 3548 if (stcb->asoc.str_reset == NULL) { 3549 return; 3550 } 3551 asoc = &stcb->asoc; 3552 3553 sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_26); 3554 TAILQ_REMOVE(&asoc->control_send_queue, 3555 chk, 3556 sctp_next); 3557 if (chk->data) { 3558 sctp_m_freem(chk->data); 3559 chk->data = NULL; 3560 } 3561 asoc->ctrl_queue_cnt--; 3562 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3563 /* sa_ignore NO_NULL_CHK */ 3564 stcb->asoc.str_reset = NULL; 3565 } 3566 3567 3568 static int 3569 sctp_handle_stream_reset_response(struct sctp_tcb *stcb, 3570 uint32_t seq, uint32_t action, 3571 struct sctp_stream_reset_response *respin) 3572 { 3573 uint16_t type; 3574 int lparm_len; 3575 struct sctp_association *asoc = &stcb->asoc; 3576 struct sctp_tmit_chunk *chk; 3577 struct sctp_stream_reset_out_request *srparam; 3578 int number_entries; 3579 3580 if (asoc->stream_reset_outstanding == 0) { 3581 /* duplicate */ 3582 return (0); 3583 } 3584 if (seq == stcb->asoc.str_reset_seq_out) { 3585 srparam = sctp_find_stream_reset(stcb, seq, &chk); 3586 if (srparam) { 3587 stcb->asoc.str_reset_seq_out++; 3588 type = ntohs(srparam->ph.param_type); 3589 lparm_len = ntohs(srparam->ph.param_length); 3590 if (type == SCTP_STR_RESET_OUT_REQUEST) { 3591 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t); 3592 asoc->stream_reset_out_is_outstanding = 0; 3593 if (asoc->stream_reset_outstanding) 3594 asoc->stream_reset_outstanding--; 3595 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3596 /* do it */ 3597 sctp_reset_out_streams(stcb, number_entries, srparam->list_of_streams); 3598 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3599 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED); 3600 } else { 3601 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED); 3602 } 3603 } else if (type == SCTP_STR_RESET_IN_REQUEST) { 3604 /* Answered my request */ 3605 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t); 3606 if (asoc->stream_reset_outstanding) 3607 asoc->stream_reset_outstanding--; 3608 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3609 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb, 3610 number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED); 3611 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3612 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb, 3613 number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED); 3614 } 3615 } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) { 3616 /* Ok we now may have more streams */ 3617 int num_stream; 3618 3619 num_stream = stcb->asoc.strm_pending_add_size; 3620 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) { 3621 /* TSNH */ 3622 num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt; 3623 } 3624 stcb->asoc.strm_pending_add_size = 0; 3625 if (asoc->stream_reset_outstanding) 3626 asoc->stream_reset_outstanding--; 3627 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3628 /* Put the new streams into effect */ 3629 stcb->asoc.streamoutcnt += num_stream; 3630 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 3631 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3632 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3633 SCTP_STREAM_CHANGE_DENIED); 3634 } else { 3635 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3636 SCTP_STREAM_CHANGE_FAILED); 3637 } 3638 } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) { 3639 if (asoc->stream_reset_outstanding) 3640 asoc->stream_reset_outstanding--; 3641 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3642 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3643 SCTP_STREAM_CHANGE_DENIED); 3644 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3645 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3646 SCTP_STREAM_CHANGE_FAILED); 3647 } 3648 } else if (type == SCTP_STR_RESET_TSN_REQUEST) { 3649 /** 3650 * a) Adopt the new in tsn. 3651 * b) reset the map 3652 * c) Adopt the new out-tsn 3653 */ 3654 struct sctp_stream_reset_response_tsn *resp; 3655 struct sctp_forward_tsn_chunk fwdtsn; 3656 int abort_flag = 0; 3657 3658 if (respin == NULL) { 3659 /* huh ? */ 3660 return (0); 3661 } 3662 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3663 resp = (struct sctp_stream_reset_response_tsn *)respin; 3664 asoc->stream_reset_outstanding--; 3665 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3666 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3667 fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1); 3668 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3669 if (abort_flag) { 3670 return (1); 3671 } 3672 stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1); 3673 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3674 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3675 } 3676 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 3677 stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn); 3678 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 3679 3680 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map; 3681 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size); 3682 3683 stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn); 3684 stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn; 3685 3686 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL); 3687 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL); 3688 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0); 3689 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3690 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3691 SCTP_ASSOC_RESET_DENIED); 3692 } else { 3693 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3694 SCTP_ASSOC_RESET_FAILED); 3695 } 3696 } 3697 /* get rid of the request and get the request flags */ 3698 if (asoc->stream_reset_outstanding == 0) { 3699 sctp_clean_up_stream_reset(stcb); 3700 } 3701 } 3702 } 3703 return (0); 3704 } 3705 3706 static void 3707 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb, 3708 struct sctp_tmit_chunk *chk, 3709 struct sctp_stream_reset_in_request *req, int trunc) 3710 { 3711 uint32_t seq; 3712 int len, i; 3713 int number_entries; 3714 uint16_t temp; 3715 3716 /* 3717 * peer wants me to send a str-reset to him for my outgoing seq's if 3718 * seq_in is right. 3719 */ 3720 struct sctp_association *asoc = &stcb->asoc; 3721 3722 seq = ntohl(req->request_seq); 3723 if (asoc->str_reset_seq_in == seq) { 3724 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3725 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3726 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3727 } else if (trunc) { 3728 /* Can't do it, since they exceeded our buffer size */ 3729 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3730 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) { 3731 len = ntohs(req->ph.param_length); 3732 number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t)); 3733 for (i = 0; i < number_entries; i++) { 3734 temp = ntohs(req->list_of_streams[i]); 3735 req->list_of_streams[i] = temp; 3736 } 3737 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3738 sctp_add_stream_reset_out(chk, number_entries, req->list_of_streams, 3739 asoc->str_reset_seq_out, 3740 seq, (asoc->sending_seq - 1)); 3741 asoc->stream_reset_out_is_outstanding = 1; 3742 asoc->str_reset = chk; 3743 sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo); 3744 stcb->asoc.stream_reset_outstanding++; 3745 } else { 3746 /* Can't do it, since we have sent one out */ 3747 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 3748 } 3749 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3750 asoc->str_reset_seq_in++; 3751 } else if (asoc->str_reset_seq_in - 1 == seq) { 3752 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3753 } else if (asoc->str_reset_seq_in - 2 == seq) { 3754 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3755 } else { 3756 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3757 } 3758 } 3759 3760 static int 3761 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb, 3762 struct sctp_tmit_chunk *chk, 3763 struct sctp_stream_reset_tsn_request *req) 3764 { 3765 /* reset all in and out and update the tsn */ 3766 /* 3767 * A) reset my str-seq's on in and out. B) Select a receive next, 3768 * and set cum-ack to it. Also process this selected number as a 3769 * fwd-tsn as well. C) set in the response my next sending seq. 3770 */ 3771 struct sctp_forward_tsn_chunk fwdtsn; 3772 struct sctp_association *asoc = &stcb->asoc; 3773 int abort_flag = 0; 3774 uint32_t seq; 3775 3776 seq = ntohl(req->request_seq); 3777 if (asoc->str_reset_seq_in == seq) { 3778 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3779 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 3780 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3781 } else { 3782 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3783 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3784 fwdtsn.ch.chunk_flags = 0; 3785 fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1); 3786 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3787 if (abort_flag) { 3788 return (1); 3789 } 3790 asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA; 3791 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3792 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3793 } 3794 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map; 3795 asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1; 3796 memset(asoc->mapping_array, 0, asoc->mapping_array_size); 3797 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 3798 memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size); 3799 atomic_add_int(&asoc->sending_seq, 1); 3800 /* save off historical data for retrans */ 3801 asoc->last_sending_seq[1] = asoc->last_sending_seq[0]; 3802 asoc->last_sending_seq[0] = asoc->sending_seq; 3803 asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0]; 3804 asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn; 3805 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL); 3806 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL); 3807 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3808 sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0); 3809 } 3810 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3811 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3812 asoc->str_reset_seq_in++; 3813 } else if (asoc->str_reset_seq_in - 1 == seq) { 3814 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3815 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3816 } else if (asoc->str_reset_seq_in - 2 == seq) { 3817 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1], 3818 asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]); 3819 } else { 3820 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3821 } 3822 return (0); 3823 } 3824 3825 static void 3826 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb, 3827 struct sctp_tmit_chunk *chk, 3828 struct sctp_stream_reset_out_request *req, int trunc) 3829 { 3830 uint32_t seq, tsn; 3831 int number_entries, len; 3832 struct sctp_association *asoc = &stcb->asoc; 3833 3834 seq = ntohl(req->request_seq); 3835 3836 /* now if its not a duplicate we process it */ 3837 if (asoc->str_reset_seq_in == seq) { 3838 len = ntohs(req->ph.param_length); 3839 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t)); 3840 /* 3841 * the sender is resetting, handle the list issue.. we must 3842 * a) verify if we can do the reset, if so no problem b) If 3843 * we can't do the reset we must copy the request. c) queue 3844 * it, and setup the data in processor to trigger it off 3845 * when needed and dequeue all the queued data. 3846 */ 3847 tsn = ntohl(req->send_reset_at_tsn); 3848 3849 /* move the reset action back one */ 3850 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3851 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3852 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3853 } else if (trunc) { 3854 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3855 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) { 3856 /* we can do it now */ 3857 sctp_reset_in_stream(stcb, number_entries, req->list_of_streams); 3858 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3859 } else { 3860 /* 3861 * we must queue it up and thus wait for the TSN's 3862 * to arrive that are at or before tsn 3863 */ 3864 struct sctp_stream_reset_list *liste; 3865 int siz; 3866 3867 siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t)); 3868 SCTP_MALLOC(liste, struct sctp_stream_reset_list *, 3869 siz, SCTP_M_STRESET); 3870 if (liste == NULL) { 3871 /* gak out of memory */ 3872 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3873 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3874 return; 3875 } 3876 liste->tsn = tsn; 3877 liste->number_entries = number_entries; 3878 memcpy(&liste->req, req, 3879 (sizeof(struct sctp_stream_reset_out_request) + (number_entries * sizeof(uint16_t)))); 3880 TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp); 3881 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3882 } 3883 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3884 asoc->str_reset_seq_in++; 3885 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3886 /* 3887 * one seq back, just echo back last action since my 3888 * response was lost. 3889 */ 3890 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3891 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3892 /* 3893 * two seq back, just echo back last action since my 3894 * response was lost. 3895 */ 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 } 3901 3902 static void 3903 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 3904 struct sctp_stream_reset_add_strm *str_add) 3905 { 3906 /* 3907 * Peer is requesting to add more streams. If its within our 3908 * max-streams we will allow it. 3909 */ 3910 uint32_t num_stream, i; 3911 uint32_t seq; 3912 struct sctp_association *asoc = &stcb->asoc; 3913 struct sctp_queued_to_read *ctl, *nctl; 3914 3915 /* Get the number. */ 3916 seq = ntohl(str_add->request_seq); 3917 num_stream = ntohs(str_add->number_of_streams); 3918 /* Now what would be the new total? */ 3919 if (asoc->str_reset_seq_in == seq) { 3920 num_stream += stcb->asoc.streamincnt; 3921 stcb->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 if ((num_stream > stcb->asoc.max_inbound_streams) || 3925 (num_stream > 0xffff)) { 3926 /* We must reject it they ask for to many */ 3927 denied: 3928 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3929 } else { 3930 /* Ok, we can do that :-) */ 3931 struct sctp_stream_in *oldstrm; 3932 3933 /* save off the old */ 3934 oldstrm = stcb->asoc.strmin; 3935 SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *, 3936 (num_stream * sizeof(struct sctp_stream_in)), 3937 SCTP_M_STRMI); 3938 if (stcb->asoc.strmin == NULL) { 3939 stcb->asoc.strmin = oldstrm; 3940 goto denied; 3941 } 3942 /* copy off the old data */ 3943 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3944 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 3945 stcb->asoc.strmin[i].stream_no = i; 3946 stcb->asoc.strmin[i].last_sequence_delivered = oldstrm[i].last_sequence_delivered; 3947 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started; 3948 /* now anything on those queues? */ 3949 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next, nctl) { 3950 TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next); 3951 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next); 3952 } 3953 } 3954 /* Init the new streams */ 3955 for (i = stcb->asoc.streamincnt; i < num_stream; i++) { 3956 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 3957 stcb->asoc.strmin[i].stream_no = i; 3958 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff; 3959 stcb->asoc.strmin[i].delivery_started = 0; 3960 } 3961 SCTP_FREE(oldstrm, SCTP_M_STRMI); 3962 /* update the size */ 3963 stcb->asoc.streamincnt = num_stream; 3964 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3965 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 3966 } 3967 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3968 asoc->str_reset_seq_in++; 3969 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3970 /* 3971 * one seq back, just echo back last action since my 3972 * response was lost. 3973 */ 3974 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3975 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3976 /* 3977 * two seq back, just echo back last action since my 3978 * response was lost. 3979 */ 3980 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3981 } else { 3982 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3983 3984 } 3985 } 3986 3987 static void 3988 sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 3989 struct sctp_stream_reset_add_strm *str_add) 3990 { 3991 /* 3992 * Peer is requesting to add more streams. If its within our 3993 * max-streams we will allow it. 3994 */ 3995 uint16_t num_stream; 3996 uint32_t seq; 3997 struct sctp_association *asoc = &stcb->asoc; 3998 3999 /* Get the number. */ 4000 seq = ntohl(str_add->request_seq); 4001 num_stream = ntohs(str_add->number_of_streams); 4002 /* Now what would be the new total? */ 4003 if (asoc->str_reset_seq_in == seq) { 4004 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 4005 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 4006 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4007 } else if (stcb->asoc.stream_reset_outstanding) { 4008 /* We must reject it we have something pending */ 4009 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 4010 } else { 4011 /* Ok, we can do that :-) */ 4012 int mychk; 4013 4014 mychk = stcb->asoc.streamoutcnt; 4015 mychk += num_stream; 4016 if (mychk < 0x10000) { 4017 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 4018 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 0, 1, num_stream, 0, 1)) { 4019 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4020 } 4021 } else { 4022 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4023 } 4024 } 4025 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]); 4026 asoc->str_reset_seq_in++; 4027 } else if ((asoc->str_reset_seq_in - 1) == seq) { 4028 /* 4029 * one seq back, just echo back last action since my 4030 * response was lost. 4031 */ 4032 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4033 } else if ((asoc->str_reset_seq_in - 2) == seq) { 4034 /* 4035 * two seq back, just echo back last action since my 4036 * response was lost. 4037 */ 4038 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 4039 } else { 4040 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 4041 } 4042 } 4043 4044 #ifdef __GNUC__ 4045 __attribute__((noinline)) 4046 #endif 4047 static int 4048 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset, 4049 struct sctp_stream_reset_out_req *sr_req) 4050 { 4051 int chk_length, param_len, ptype; 4052 struct sctp_paramhdr pstore; 4053 uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE]; 4054 uint32_t seq = 0; 4055 int num_req = 0; 4056 int trunc = 0; 4057 struct sctp_tmit_chunk *chk; 4058 struct sctp_chunkhdr *ch; 4059 struct sctp_paramhdr *ph; 4060 int ret_code = 0; 4061 int num_param = 0; 4062 4063 /* now it may be a reset or a reset-response */ 4064 chk_length = ntohs(sr_req->ch.chunk_length); 4065 4066 /* setup for adding the response */ 4067 sctp_alloc_a_chunk(stcb, chk); 4068 if (chk == NULL) { 4069 return (ret_code); 4070 } 4071 chk->rec.chunk_id.id = SCTP_STREAM_RESET; 4072 chk->rec.chunk_id.can_take_data = 0; 4073 chk->asoc = &stcb->asoc; 4074 chk->no_fr_allowed = 0; 4075 chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr); 4076 chk->book_size_scale = 0; 4077 chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA); 4078 if (chk->data == NULL) { 4079 strres_nochunk: 4080 if (chk->data) { 4081 sctp_m_freem(chk->data); 4082 chk->data = NULL; 4083 } 4084 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 4085 return (ret_code); 4086 } 4087 SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD); 4088 4089 /* setup chunk parameters */ 4090 chk->sent = SCTP_DATAGRAM_UNSENT; 4091 chk->snd_count = 0; 4092 chk->whoTo = NULL; 4093 4094 ch = mtod(chk->data, struct sctp_chunkhdr *); 4095 ch->chunk_type = SCTP_STREAM_RESET; 4096 ch->chunk_flags = 0; 4097 ch->chunk_length = htons(chk->send_size); 4098 SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size); 4099 offset += sizeof(struct sctp_chunkhdr); 4100 while ((size_t)chk_length >= sizeof(struct sctp_stream_reset_tsn_request)) { 4101 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *) & pstore); 4102 if (ph == NULL) 4103 break; 4104 param_len = ntohs(ph->param_length); 4105 if (param_len < (int)sizeof(struct sctp_stream_reset_tsn_request)) { 4106 /* bad param */ 4107 break; 4108 } 4109 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, (int)sizeof(cstore)), 4110 (uint8_t *) & cstore); 4111 ptype = ntohs(ph->param_type); 4112 num_param++; 4113 if (param_len > (int)sizeof(cstore)) { 4114 trunc = 1; 4115 } else { 4116 trunc = 0; 4117 } 4118 if (num_param > SCTP_MAX_RESET_PARAMS) { 4119 /* hit the max of parameters already sorry.. */ 4120 break; 4121 } 4122 if (ptype == SCTP_STR_RESET_OUT_REQUEST) { 4123 struct sctp_stream_reset_out_request *req_out; 4124 4125 req_out = (struct sctp_stream_reset_out_request *)ph; 4126 num_req++; 4127 if (stcb->asoc.stream_reset_outstanding) { 4128 seq = ntohl(req_out->response_seq); 4129 if (seq == stcb->asoc.str_reset_seq_out) { 4130 /* implicit ack */ 4131 (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL); 4132 } 4133 } 4134 sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc); 4135 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) { 4136 struct sctp_stream_reset_add_strm *str_add; 4137 4138 str_add = (struct sctp_stream_reset_add_strm *)ph; 4139 num_req++; 4140 sctp_handle_str_reset_add_strm(stcb, chk, str_add); 4141 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) { 4142 struct sctp_stream_reset_add_strm *str_add; 4143 4144 str_add = (struct sctp_stream_reset_add_strm *)ph; 4145 num_req++; 4146 sctp_handle_str_reset_add_out_strm(stcb, chk, str_add); 4147 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) { 4148 struct sctp_stream_reset_in_request *req_in; 4149 4150 num_req++; 4151 req_in = (struct sctp_stream_reset_in_request *)ph; 4152 sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc); 4153 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) { 4154 struct sctp_stream_reset_tsn_request *req_tsn; 4155 4156 num_req++; 4157 req_tsn = (struct sctp_stream_reset_tsn_request *)ph; 4158 if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) { 4159 ret_code = 1; 4160 goto strres_nochunk; 4161 } 4162 /* no more */ 4163 break; 4164 } else if (ptype == SCTP_STR_RESET_RESPONSE) { 4165 struct sctp_stream_reset_response *resp; 4166 uint32_t result; 4167 4168 resp = (struct sctp_stream_reset_response *)ph; 4169 seq = ntohl(resp->response_seq); 4170 result = ntohl(resp->result); 4171 if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) { 4172 ret_code = 1; 4173 goto strres_nochunk; 4174 } 4175 } else { 4176 break; 4177 } 4178 offset += SCTP_SIZE32(param_len); 4179 chk_length -= SCTP_SIZE32(param_len); 4180 } 4181 if (num_req == 0) { 4182 /* we have no response free the stuff */ 4183 goto strres_nochunk; 4184 } 4185 /* ok we have a chunk to link in */ 4186 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, 4187 chk, 4188 sctp_next); 4189 stcb->asoc.ctrl_queue_cnt++; 4190 return (ret_code); 4191 } 4192 4193 /* 4194 * Handle a router or endpoints report of a packet loss, there are two ways 4195 * to handle this, either we get the whole packet and must disect it 4196 * ourselves (possibly with truncation and or corruption) or it is a summary 4197 * from a middle box that did the disectting for us. 4198 */ 4199 static void 4200 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp, 4201 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 4202 { 4203 uint32_t bottle_bw, on_queue; 4204 uint16_t trunc_len; 4205 unsigned int chlen; 4206 unsigned int at; 4207 struct sctp_chunk_desc desc; 4208 struct sctp_chunkhdr *ch; 4209 4210 chlen = ntohs(cp->ch.chunk_length); 4211 chlen -= sizeof(struct sctp_pktdrop_chunk); 4212 /* XXX possible chlen underflow */ 4213 if (chlen == 0) { 4214 ch = NULL; 4215 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) 4216 SCTP_STAT_INCR(sctps_pdrpbwrpt); 4217 } else { 4218 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr)); 4219 chlen -= sizeof(struct sctphdr); 4220 /* XXX possible chlen underflow */ 4221 memset(&desc, 0, sizeof(desc)); 4222 } 4223 trunc_len = (uint16_t) ntohs(cp->trunc_len); 4224 if (trunc_len > limit) { 4225 trunc_len = limit; 4226 } 4227 /* now the chunks themselves */ 4228 while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) { 4229 desc.chunk_type = ch->chunk_type; 4230 /* get amount we need to move */ 4231 at = ntohs(ch->chunk_length); 4232 if (at < sizeof(struct sctp_chunkhdr)) { 4233 /* corrupt chunk, maybe at the end? */ 4234 SCTP_STAT_INCR(sctps_pdrpcrupt); 4235 break; 4236 } 4237 if (trunc_len == 0) { 4238 /* we are supposed to have all of it */ 4239 if (at > chlen) { 4240 /* corrupt skip it */ 4241 SCTP_STAT_INCR(sctps_pdrpcrupt); 4242 break; 4243 } 4244 } else { 4245 /* is there enough of it left ? */ 4246 if (desc.chunk_type == SCTP_DATA) { 4247 if (chlen < (sizeof(struct sctp_data_chunk) + 4248 sizeof(desc.data_bytes))) { 4249 break; 4250 } 4251 } else { 4252 if (chlen < sizeof(struct sctp_chunkhdr)) { 4253 break; 4254 } 4255 } 4256 } 4257 if (desc.chunk_type == SCTP_DATA) { 4258 /* can we get out the tsn? */ 4259 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4260 SCTP_STAT_INCR(sctps_pdrpmbda); 4261 4262 if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) { 4263 /* yep */ 4264 struct sctp_data_chunk *dcp; 4265 uint8_t *ddp; 4266 unsigned int iii; 4267 4268 dcp = (struct sctp_data_chunk *)ch; 4269 ddp = (uint8_t *) (dcp + 1); 4270 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) { 4271 desc.data_bytes[iii] = ddp[iii]; 4272 } 4273 desc.tsn_ifany = dcp->dp.tsn; 4274 } else { 4275 /* nope we are done. */ 4276 SCTP_STAT_INCR(sctps_pdrpnedat); 4277 break; 4278 } 4279 } else { 4280 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4281 SCTP_STAT_INCR(sctps_pdrpmbct); 4282 } 4283 4284 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) { 4285 SCTP_STAT_INCR(sctps_pdrppdbrk); 4286 break; 4287 } 4288 if (SCTP_SIZE32(at) > chlen) { 4289 break; 4290 } 4291 chlen -= SCTP_SIZE32(at); 4292 if (chlen < sizeof(struct sctp_chunkhdr)) { 4293 /* done, none left */ 4294 break; 4295 } 4296 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at)); 4297 } 4298 /* Now update any rwnd --- possibly */ 4299 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) { 4300 /* From a peer, we get a rwnd report */ 4301 uint32_t a_rwnd; 4302 4303 SCTP_STAT_INCR(sctps_pdrpfehos); 4304 4305 bottle_bw = ntohl(cp->bottle_bw); 4306 on_queue = ntohl(cp->current_onq); 4307 if (bottle_bw && on_queue) { 4308 /* a rwnd report is in here */ 4309 if (bottle_bw > on_queue) 4310 a_rwnd = bottle_bw - on_queue; 4311 else 4312 a_rwnd = 0; 4313 4314 if (a_rwnd == 0) 4315 stcb->asoc.peers_rwnd = 0; 4316 else { 4317 if (a_rwnd > stcb->asoc.total_flight) { 4318 stcb->asoc.peers_rwnd = 4319 a_rwnd - stcb->asoc.total_flight; 4320 } else { 4321 stcb->asoc.peers_rwnd = 0; 4322 } 4323 if (stcb->asoc.peers_rwnd < 4324 stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 4325 /* SWS sender side engages */ 4326 stcb->asoc.peers_rwnd = 0; 4327 } 4328 } 4329 } 4330 } else { 4331 SCTP_STAT_INCR(sctps_pdrpfmbox); 4332 } 4333 4334 /* now middle boxes in sat networks get a cwnd bump */ 4335 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) && 4336 (stcb->asoc.sat_t3_loss_recovery == 0) && 4337 (stcb->asoc.sat_network)) { 4338 /* 4339 * This is debateable but for sat networks it makes sense 4340 * Note if a T3 timer has went off, we will prohibit any 4341 * changes to cwnd until we exit the t3 loss recovery. 4342 */ 4343 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb, 4344 net, cp, &bottle_bw, &on_queue); 4345 } 4346 } 4347 4348 /* 4349 * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to 4350 * still contain IP/SCTP header - stcb: is the tcb found for this packet - 4351 * offset: offset into the mbuf chain to first chunkhdr - length: is the 4352 * length of the complete packet outputs: - length: modified to remaining 4353 * length after control processing - netp: modified to new sctp_nets after 4354 * cookie-echo processing - return NULL to discard the packet (ie. no asoc, 4355 * bad packet,...) otherwise return the tcb for this packet 4356 */ 4357 #ifdef __GNUC__ 4358 __attribute__((noinline)) 4359 #endif 4360 static struct sctp_tcb * 4361 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length, 4362 struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp, 4363 struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen, 4364 uint32_t vrf_id, uint16_t port) 4365 { 4366 struct sctp_association *asoc; 4367 uint32_t vtag_in; 4368 int num_chunks = 0; /* number of control chunks processed */ 4369 uint32_t chk_length; 4370 int ret; 4371 int abort_no_unlock = 0; 4372 int ecne_seen = 0; 4373 4374 /* 4375 * How big should this be, and should it be alloc'd? Lets try the 4376 * d-mtu-ceiling for now (2k) and that should hopefully work ... 4377 * until we get into jumbo grams and such.. 4378 */ 4379 uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE]; 4380 struct sctp_tcb *locked_tcb = stcb; 4381 int got_auth = 0; 4382 uint32_t auth_offset = 0, auth_len = 0; 4383 int auth_skipped = 0; 4384 int asconf_cnt = 0; 4385 4386 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4387 struct socket *so; 4388 4389 #endif 4390 4391 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n", 4392 iphlen, *offset, length, stcb); 4393 4394 /* validate chunk header length... */ 4395 if (ntohs(ch->chunk_length) < sizeof(*ch)) { 4396 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n", 4397 ntohs(ch->chunk_length)); 4398 if (locked_tcb) { 4399 SCTP_TCB_UNLOCK(locked_tcb); 4400 } 4401 return (NULL); 4402 } 4403 /* 4404 * validate the verification tag 4405 */ 4406 vtag_in = ntohl(sh->v_tag); 4407 4408 if (locked_tcb) { 4409 SCTP_TCB_LOCK_ASSERT(locked_tcb); 4410 } 4411 if (ch->chunk_type == SCTP_INITIATION) { 4412 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n", 4413 ntohs(ch->chunk_length), vtag_in); 4414 if (vtag_in != 0) { 4415 /* protocol error- silently discard... */ 4416 SCTP_STAT_INCR(sctps_badvtag); 4417 if (locked_tcb) { 4418 SCTP_TCB_UNLOCK(locked_tcb); 4419 } 4420 return (NULL); 4421 } 4422 } else if (ch->chunk_type != SCTP_COOKIE_ECHO) { 4423 /* 4424 * If there is no stcb, skip the AUTH chunk and process 4425 * later after a stcb is found (to validate the lookup was 4426 * valid. 4427 */ 4428 if ((ch->chunk_type == SCTP_AUTHENTICATION) && 4429 (stcb == NULL) && 4430 !SCTP_BASE_SYSCTL(sctp_auth_disable)) { 4431 /* save this chunk for later processing */ 4432 auth_skipped = 1; 4433 auth_offset = *offset; 4434 auth_len = ntohs(ch->chunk_length); 4435 4436 /* (temporarily) move past this chunk */ 4437 *offset += SCTP_SIZE32(auth_len); 4438 if (*offset >= length) { 4439 /* no more data left in the mbuf chain */ 4440 *offset = length; 4441 if (locked_tcb) { 4442 SCTP_TCB_UNLOCK(locked_tcb); 4443 } 4444 return (NULL); 4445 } 4446 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4447 sizeof(struct sctp_chunkhdr), chunk_buf); 4448 } 4449 if (ch == NULL) { 4450 /* Help */ 4451 *offset = length; 4452 if (locked_tcb) { 4453 SCTP_TCB_UNLOCK(locked_tcb); 4454 } 4455 return (NULL); 4456 } 4457 if (ch->chunk_type == SCTP_COOKIE_ECHO) { 4458 goto process_control_chunks; 4459 } 4460 /* 4461 * first check if it's an ASCONF with an unknown src addr we 4462 * need to look inside to find the association 4463 */ 4464 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) { 4465 struct sctp_chunkhdr *asconf_ch = ch; 4466 uint32_t asconf_offset = 0, asconf_len = 0; 4467 4468 /* inp's refcount may be reduced */ 4469 SCTP_INP_INCR_REF(inp); 4470 4471 asconf_offset = *offset; 4472 do { 4473 asconf_len = ntohs(asconf_ch->chunk_length); 4474 if (asconf_len < sizeof(struct sctp_asconf_paramhdr)) 4475 break; 4476 stcb = sctp_findassociation_ep_asconf(m, 4477 *offset, sh, &inp, netp, vrf_id); 4478 if (stcb != NULL) 4479 break; 4480 asconf_offset += SCTP_SIZE32(asconf_len); 4481 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset, 4482 sizeof(struct sctp_chunkhdr), chunk_buf); 4483 } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF); 4484 if (stcb == NULL) { 4485 /* 4486 * reduce inp's refcount if not reduced in 4487 * sctp_findassociation_ep_asconf(). 4488 */ 4489 SCTP_INP_DECR_REF(inp); 4490 } else { 4491 locked_tcb = stcb; 4492 } 4493 4494 /* now go back and verify any auth chunk to be sure */ 4495 if (auth_skipped && (stcb != NULL)) { 4496 struct sctp_auth_chunk *auth; 4497 4498 auth = (struct sctp_auth_chunk *) 4499 sctp_m_getptr(m, auth_offset, 4500 auth_len, chunk_buf); 4501 got_auth = 1; 4502 auth_skipped = 0; 4503 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, 4504 auth_offset)) { 4505 /* auth HMAC failed so dump it */ 4506 *offset = length; 4507 if (locked_tcb) { 4508 SCTP_TCB_UNLOCK(locked_tcb); 4509 } 4510 return (NULL); 4511 } else { 4512 /* remaining chunks are HMAC checked */ 4513 stcb->asoc.authenticated = 1; 4514 } 4515 } 4516 } 4517 if (stcb == NULL) { 4518 /* no association, so it's out of the blue... */ 4519 sctp_handle_ootb(m, iphlen, *offset, sh, inp, 4520 vrf_id, port); 4521 *offset = length; 4522 if (locked_tcb) { 4523 SCTP_TCB_UNLOCK(locked_tcb); 4524 } 4525 return (NULL); 4526 } 4527 asoc = &stcb->asoc; 4528 /* ABORT and SHUTDOWN can use either v_tag... */ 4529 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) || 4530 (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) || 4531 (ch->chunk_type == SCTP_PACKET_DROPPED)) { 4532 if ((vtag_in == asoc->my_vtag) || 4533 ((ch->chunk_flags & SCTP_HAD_NO_TCB) && 4534 (vtag_in == asoc->peer_vtag))) { 4535 /* this is valid */ 4536 } else { 4537 /* drop this packet... */ 4538 SCTP_STAT_INCR(sctps_badvtag); 4539 if (locked_tcb) { 4540 SCTP_TCB_UNLOCK(locked_tcb); 4541 } 4542 return (NULL); 4543 } 4544 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 4545 if (vtag_in != asoc->my_vtag) { 4546 /* 4547 * this could be a stale SHUTDOWN-ACK or the 4548 * peer never got the SHUTDOWN-COMPLETE and 4549 * is still hung; we have started a new asoc 4550 * but it won't complete until the shutdown 4551 * is completed 4552 */ 4553 if (locked_tcb) { 4554 SCTP_TCB_UNLOCK(locked_tcb); 4555 } 4556 sctp_handle_ootb(m, iphlen, *offset, sh, inp, 4557 vrf_id, port); 4558 return (NULL); 4559 } 4560 } else { 4561 /* for all other chunks, vtag must match */ 4562 if (vtag_in != asoc->my_vtag) { 4563 /* invalid vtag... */ 4564 SCTPDBG(SCTP_DEBUG_INPUT3, 4565 "invalid vtag: %xh, expect %xh\n", 4566 vtag_in, asoc->my_vtag); 4567 SCTP_STAT_INCR(sctps_badvtag); 4568 if (locked_tcb) { 4569 SCTP_TCB_UNLOCK(locked_tcb); 4570 } 4571 *offset = length; 4572 return (NULL); 4573 } 4574 } 4575 } /* end if !SCTP_COOKIE_ECHO */ 4576 /* 4577 * process all control chunks... 4578 */ 4579 if (((ch->chunk_type == SCTP_SELECTIVE_ACK) || 4580 (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) || 4581 (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) && 4582 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) { 4583 /* implied cookie-ack.. we must have lost the ack */ 4584 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4585 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4586 stcb->asoc.overall_error_count, 4587 0, 4588 SCTP_FROM_SCTP_INPUT, 4589 __LINE__); 4590 } 4591 stcb->asoc.overall_error_count = 0; 4592 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, 4593 *netp); 4594 } 4595 process_control_chunks: 4596 while (IS_SCTP_CONTROL(ch)) { 4597 /* validate chunk length */ 4598 chk_length = ntohs(ch->chunk_length); 4599 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n", 4600 ch->chunk_type, chk_length); 4601 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length); 4602 if (chk_length < sizeof(*ch) || 4603 (*offset + (int)chk_length) > length) { 4604 *offset = length; 4605 if (locked_tcb) { 4606 SCTP_TCB_UNLOCK(locked_tcb); 4607 } 4608 return (NULL); 4609 } 4610 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks); 4611 /* 4612 * INIT-ACK only gets the init ack "header" portion only 4613 * because we don't have to process the peer's COOKIE. All 4614 * others get a complete chunk. 4615 */ 4616 if ((ch->chunk_type == SCTP_INITIATION_ACK) || 4617 (ch->chunk_type == SCTP_INITIATION)) { 4618 /* get an init-ack chunk */ 4619 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4620 sizeof(struct sctp_init_ack_chunk), chunk_buf); 4621 if (ch == NULL) { 4622 *offset = length; 4623 if (locked_tcb) { 4624 SCTP_TCB_UNLOCK(locked_tcb); 4625 } 4626 return (NULL); 4627 } 4628 } else { 4629 /* For cookies and all other chunks. */ 4630 if (chk_length > sizeof(chunk_buf)) { 4631 /* 4632 * use just the size of the chunk buffer so 4633 * the front part of our chunks fit in 4634 * contiguous space up to the chunk buffer 4635 * size (508 bytes). For chunks that need to 4636 * get more than that they must use the 4637 * sctp_m_getptr() function or other means 4638 * (e.g. know how to parse mbuf chains). 4639 * Cookies do this already. 4640 */ 4641 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4642 (sizeof(chunk_buf) - 4), 4643 chunk_buf); 4644 if (ch == NULL) { 4645 *offset = length; 4646 if (locked_tcb) { 4647 SCTP_TCB_UNLOCK(locked_tcb); 4648 } 4649 return (NULL); 4650 } 4651 } else { 4652 /* We can fit it all */ 4653 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4654 chk_length, chunk_buf); 4655 if (ch == NULL) { 4656 SCTP_PRINTF("sctp_process_control: Can't get the all data....\n"); 4657 *offset = length; 4658 if (locked_tcb) { 4659 SCTP_TCB_UNLOCK(locked_tcb); 4660 } 4661 return (NULL); 4662 } 4663 } 4664 } 4665 num_chunks++; 4666 /* Save off the last place we got a control from */ 4667 if (stcb != NULL) { 4668 if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) { 4669 /* 4670 * allow last_control to be NULL if 4671 * ASCONF... ASCONF processing will find the 4672 * right net later 4673 */ 4674 if ((netp != NULL) && (*netp != NULL)) 4675 stcb->asoc.last_control_chunk_from = *netp; 4676 } 4677 } 4678 #ifdef SCTP_AUDITING_ENABLED 4679 sctp_audit_log(0xB0, ch->chunk_type); 4680 #endif 4681 4682 /* check to see if this chunk required auth, but isn't */ 4683 if ((stcb != NULL) && 4684 !SCTP_BASE_SYSCTL(sctp_auth_disable) && 4685 sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) && 4686 !stcb->asoc.authenticated) { 4687 /* "silently" ignore */ 4688 SCTP_STAT_INCR(sctps_recvauthmissing); 4689 goto next_chunk; 4690 } 4691 switch (ch->chunk_type) { 4692 case SCTP_INITIATION: 4693 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n"); 4694 /* The INIT chunk must be the only chunk. */ 4695 if ((num_chunks > 1) || 4696 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4697 sctp_abort_association(inp, stcb, m, 4698 iphlen, sh, NULL, vrf_id, port); 4699 *offset = length; 4700 return (NULL); 4701 } 4702 /* Honor our resource limit. */ 4703 if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) { 4704 struct mbuf *op_err; 4705 4706 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC); 4707 sctp_abort_association(inp, stcb, m, 4708 iphlen, sh, op_err, vrf_id, port); 4709 *offset = length; 4710 return (NULL); 4711 } 4712 sctp_handle_init(m, iphlen, *offset, sh, 4713 (struct sctp_init_chunk *)ch, inp, 4714 stcb, &abort_no_unlock, vrf_id, port); 4715 *offset = length; 4716 if ((!abort_no_unlock) && (locked_tcb)) { 4717 SCTP_TCB_UNLOCK(locked_tcb); 4718 } 4719 return (NULL); 4720 break; 4721 case SCTP_PAD_CHUNK: 4722 break; 4723 case SCTP_INITIATION_ACK: 4724 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT-ACK\n"); 4725 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4726 /* We are not interested anymore */ 4727 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4728 ; 4729 } else { 4730 if (locked_tcb != stcb) { 4731 /* Very unlikely */ 4732 SCTP_TCB_UNLOCK(locked_tcb); 4733 } 4734 *offset = length; 4735 if (stcb) { 4736 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4737 so = SCTP_INP_SO(inp); 4738 atomic_add_int(&stcb->asoc.refcnt, 1); 4739 SCTP_TCB_UNLOCK(stcb); 4740 SCTP_SOCKET_LOCK(so, 1); 4741 SCTP_TCB_LOCK(stcb); 4742 atomic_subtract_int(&stcb->asoc.refcnt, 1); 4743 #endif 4744 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 4745 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4746 SCTP_SOCKET_UNLOCK(so, 1); 4747 #endif 4748 } 4749 return (NULL); 4750 } 4751 } 4752 /* The INIT-ACK chunk must be the only chunk. */ 4753 if ((num_chunks > 1) || 4754 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4755 *offset = length; 4756 if (locked_tcb) { 4757 SCTP_TCB_UNLOCK(locked_tcb); 4758 } 4759 return (NULL); 4760 } 4761 if ((netp) && (*netp)) { 4762 ret = sctp_handle_init_ack(m, iphlen, *offset, sh, 4763 (struct sctp_init_ack_chunk *)ch, stcb, *netp, &abort_no_unlock, vrf_id); 4764 } else { 4765 ret = -1; 4766 } 4767 *offset = length; 4768 if (abort_no_unlock) { 4769 return (NULL); 4770 } 4771 /* 4772 * Special case, I must call the output routine to 4773 * get the cookie echoed 4774 */ 4775 if ((stcb != NULL) && (ret == 0)) { 4776 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 4777 } 4778 if (locked_tcb) { 4779 SCTP_TCB_UNLOCK(locked_tcb); 4780 } 4781 return (NULL); 4782 break; 4783 case SCTP_SELECTIVE_ACK: 4784 { 4785 struct sctp_sack_chunk *sack; 4786 int abort_now = 0; 4787 uint32_t a_rwnd, cum_ack; 4788 uint16_t num_seg, num_dup; 4789 uint8_t flags; 4790 int offset_seg, offset_dup; 4791 4792 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK\n"); 4793 SCTP_STAT_INCR(sctps_recvsacks); 4794 if (stcb == NULL) { 4795 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing SACK chunk\n"); 4796 break; 4797 } 4798 if (chk_length < sizeof(struct sctp_sack_chunk)) { 4799 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n"); 4800 break; 4801 } 4802 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4803 /*- 4804 * If we have sent a shutdown-ack, we will pay no 4805 * attention to a sack sent in to us since 4806 * we don't care anymore. 4807 */ 4808 break; 4809 } 4810 sack = (struct sctp_sack_chunk *)ch; 4811 flags = ch->chunk_flags; 4812 cum_ack = ntohl(sack->sack.cum_tsn_ack); 4813 num_seg = ntohs(sack->sack.num_gap_ack_blks); 4814 num_dup = ntohs(sack->sack.num_dup_tsns); 4815 a_rwnd = (uint32_t) ntohl(sack->sack.a_rwnd); 4816 if (sizeof(struct sctp_sack_chunk) + 4817 num_seg * sizeof(struct sctp_gap_ack_block) + 4818 num_dup * sizeof(uint32_t) != chk_length) { 4819 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n"); 4820 break; 4821 } 4822 offset_seg = *offset + sizeof(struct sctp_sack_chunk); 4823 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 4824 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n", 4825 cum_ack, num_seg, a_rwnd); 4826 stcb->asoc.seen_a_sack_this_pkt = 1; 4827 if ((stcb->asoc.pr_sctp_cnt == 0) && 4828 (num_seg == 0) && 4829 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 4830 (stcb->asoc.saw_sack_with_frags == 0) && 4831 (stcb->asoc.saw_sack_with_nr_frags == 0) && 4832 (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) 4833 ) { 4834 /* 4835 * We have a SIMPLE sack having no 4836 * prior segments and data on sent 4837 * queue to be acked.. Use the 4838 * faster path sack processing. We 4839 * also allow window update sacks 4840 * with no missing segments to go 4841 * this way too. 4842 */ 4843 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, &abort_now, ecne_seen); 4844 } else { 4845 if (netp && *netp) 4846 sctp_handle_sack(m, offset_seg, offset_dup, stcb, 4847 num_seg, 0, num_dup, &abort_now, flags, 4848 cum_ack, a_rwnd, ecne_seen); 4849 } 4850 if (abort_now) { 4851 /* ABORT signal from sack processing */ 4852 *offset = length; 4853 return (NULL); 4854 } 4855 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 4856 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 4857 (stcb->asoc.stream_queue_cnt == 0)) { 4858 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 4859 } 4860 } 4861 break; 4862 /* 4863 * EY - nr_sack: If the received chunk is an 4864 * nr_sack chunk 4865 */ 4866 case SCTP_NR_SELECTIVE_ACK: 4867 { 4868 struct sctp_nr_sack_chunk *nr_sack; 4869 int abort_now = 0; 4870 uint32_t a_rwnd, cum_ack; 4871 uint16_t num_seg, num_nr_seg, num_dup; 4872 uint8_t flags; 4873 int offset_seg, offset_dup; 4874 4875 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK\n"); 4876 SCTP_STAT_INCR(sctps_recvsacks); 4877 if (stcb == NULL) { 4878 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing NR-SACK chunk\n"); 4879 break; 4880 } 4881 if ((stcb->asoc.sctp_nr_sack_on_off == 0) || 4882 (stcb->asoc.peer_supports_nr_sack == 0)) { 4883 goto unknown_chunk; 4884 } 4885 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) { 4886 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR-SACK chunk, too small\n"); 4887 break; 4888 } 4889 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4890 /*- 4891 * If we have sent a shutdown-ack, we will pay no 4892 * attention to a sack sent in to us since 4893 * we don't care anymore. 4894 */ 4895 break; 4896 } 4897 nr_sack = (struct sctp_nr_sack_chunk *)ch; 4898 flags = ch->chunk_flags; 4899 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack); 4900 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks); 4901 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks); 4902 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns); 4903 a_rwnd = (uint32_t) ntohl(nr_sack->nr_sack.a_rwnd); 4904 if (sizeof(struct sctp_nr_sack_chunk) + 4905 (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) + 4906 num_dup * sizeof(uint32_t) != chk_length) { 4907 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n"); 4908 break; 4909 } 4910 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk); 4911 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 4912 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n", 4913 cum_ack, num_seg, a_rwnd); 4914 stcb->asoc.seen_a_sack_this_pkt = 1; 4915 if ((stcb->asoc.pr_sctp_cnt == 0) && 4916 (num_seg == 0) && (num_nr_seg == 0) && 4917 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 4918 (stcb->asoc.saw_sack_with_frags == 0) && 4919 (stcb->asoc.saw_sack_with_nr_frags == 0) && 4920 (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) { 4921 /* 4922 * We have a SIMPLE sack having no 4923 * prior segments and data on sent 4924 * queue to be acked. Use the faster 4925 * path sack processing. We also 4926 * allow window update sacks with no 4927 * missing segments to go this way 4928 * too. 4929 */ 4930 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, 4931 &abort_now, ecne_seen); 4932 } else { 4933 if (netp && *netp) 4934 sctp_handle_sack(m, offset_seg, offset_dup, stcb, 4935 num_seg, num_nr_seg, num_dup, &abort_now, flags, 4936 cum_ack, a_rwnd, ecne_seen); 4937 } 4938 if (abort_now) { 4939 /* ABORT signal from sack processing */ 4940 *offset = length; 4941 return (NULL); 4942 } 4943 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 4944 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 4945 (stcb->asoc.stream_queue_cnt == 0)) { 4946 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 4947 } 4948 } 4949 break; 4950 4951 case SCTP_HEARTBEAT_REQUEST: 4952 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n"); 4953 if ((stcb) && netp && *netp) { 4954 SCTP_STAT_INCR(sctps_recvheartbeat); 4955 sctp_send_heartbeat_ack(stcb, m, *offset, 4956 chk_length, *netp); 4957 4958 /* He's alive so give him credit */ 4959 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4960 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4961 stcb->asoc.overall_error_count, 4962 0, 4963 SCTP_FROM_SCTP_INPUT, 4964 __LINE__); 4965 } 4966 stcb->asoc.overall_error_count = 0; 4967 } 4968 break; 4969 case SCTP_HEARTBEAT_ACK: 4970 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT-ACK\n"); 4971 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) { 4972 /* Its not ours */ 4973 *offset = length; 4974 if (locked_tcb) { 4975 SCTP_TCB_UNLOCK(locked_tcb); 4976 } 4977 return (NULL); 4978 } 4979 /* He's alive so give him credit */ 4980 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4981 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4982 stcb->asoc.overall_error_count, 4983 0, 4984 SCTP_FROM_SCTP_INPUT, 4985 __LINE__); 4986 } 4987 stcb->asoc.overall_error_count = 0; 4988 SCTP_STAT_INCR(sctps_recvheartbeatack); 4989 if (netp && *netp) 4990 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch, 4991 stcb, *netp); 4992 break; 4993 case SCTP_ABORT_ASSOCIATION: 4994 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n", 4995 stcb); 4996 if ((stcb) && netp && *netp) 4997 sctp_handle_abort((struct sctp_abort_chunk *)ch, 4998 stcb, *netp); 4999 *offset = length; 5000 return (NULL); 5001 break; 5002 case SCTP_SHUTDOWN: 5003 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n", 5004 stcb); 5005 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) { 5006 *offset = length; 5007 if (locked_tcb) { 5008 SCTP_TCB_UNLOCK(locked_tcb); 5009 } 5010 return (NULL); 5011 } 5012 if (netp && *netp) { 5013 int abort_flag = 0; 5014 5015 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch, 5016 stcb, *netp, &abort_flag); 5017 if (abort_flag) { 5018 *offset = length; 5019 return (NULL); 5020 } 5021 } 5022 break; 5023 case SCTP_SHUTDOWN_ACK: 5024 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-ACK, stcb %p\n", stcb); 5025 if ((stcb) && (netp) && (*netp)) 5026 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp); 5027 *offset = length; 5028 return (NULL); 5029 break; 5030 5031 case SCTP_OPERATION_ERROR: 5032 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP-ERR\n"); 5033 if ((stcb) && netp && *netp && sctp_handle_error(ch, stcb, *netp) < 0) { 5034 *offset = length; 5035 return (NULL); 5036 } 5037 break; 5038 case SCTP_COOKIE_ECHO: 5039 SCTPDBG(SCTP_DEBUG_INPUT3, 5040 "SCTP_COOKIE-ECHO, stcb %p\n", stcb); 5041 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 5042 ; 5043 } else { 5044 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5045 /* We are not interested anymore */ 5046 abend: 5047 if (stcb) { 5048 SCTP_TCB_UNLOCK(stcb); 5049 } 5050 *offset = length; 5051 return (NULL); 5052 } 5053 } 5054 /* 5055 * First are we accepting? We do this again here 5056 * since it is possible that a previous endpoint WAS 5057 * listening responded to a INIT-ACK and then 5058 * closed. We opened and bound.. and are now no 5059 * longer listening. 5060 */ 5061 5062 if ((stcb == NULL) && (inp->sctp_socket->so_qlen >= inp->sctp_socket->so_qlimit)) { 5063 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 5064 (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) { 5065 struct mbuf *op_err; 5066 5067 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC); 5068 sctp_abort_association(inp, stcb, m, 5069 iphlen, sh, op_err, vrf_id, port); 5070 } 5071 *offset = length; 5072 return (NULL); 5073 } else { 5074 struct mbuf *ret_buf; 5075 struct sctp_inpcb *linp; 5076 5077 if (stcb) { 5078 linp = NULL; 5079 } else { 5080 linp = inp; 5081 } 5082 5083 if (linp) { 5084 SCTP_ASOC_CREATE_LOCK(linp); 5085 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 5086 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) { 5087 SCTP_ASOC_CREATE_UNLOCK(linp); 5088 goto abend; 5089 } 5090 } 5091 if (netp) { 5092 ret_buf = 5093 sctp_handle_cookie_echo(m, iphlen, 5094 *offset, sh, 5095 (struct sctp_cookie_echo_chunk *)ch, 5096 &inp, &stcb, netp, 5097 auth_skipped, 5098 auth_offset, 5099 auth_len, 5100 &locked_tcb, 5101 vrf_id, 5102 port); 5103 } else { 5104 ret_buf = NULL; 5105 } 5106 if (linp) { 5107 SCTP_ASOC_CREATE_UNLOCK(linp); 5108 } 5109 if (ret_buf == NULL) { 5110 if (locked_tcb) { 5111 SCTP_TCB_UNLOCK(locked_tcb); 5112 } 5113 SCTPDBG(SCTP_DEBUG_INPUT3, 5114 "GAK, null buffer\n"); 5115 *offset = length; 5116 return (NULL); 5117 } 5118 /* if AUTH skipped, see if it verified... */ 5119 if (auth_skipped) { 5120 got_auth = 1; 5121 auth_skipped = 0; 5122 } 5123 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) { 5124 /* 5125 * Restart the timer if we have 5126 * pending data 5127 */ 5128 struct sctp_tmit_chunk *chk; 5129 5130 chk = TAILQ_FIRST(&stcb->asoc.sent_queue); 5131 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 5132 } 5133 } 5134 break; 5135 case SCTP_COOKIE_ACK: 5136 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE-ACK, stcb %p\n", stcb); 5137 if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) { 5138 if (locked_tcb) { 5139 SCTP_TCB_UNLOCK(locked_tcb); 5140 } 5141 return (NULL); 5142 } 5143 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5144 /* We are not interested anymore */ 5145 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 5146 ; 5147 } else if (stcb) { 5148 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5149 so = SCTP_INP_SO(inp); 5150 atomic_add_int(&stcb->asoc.refcnt, 1); 5151 SCTP_TCB_UNLOCK(stcb); 5152 SCTP_SOCKET_LOCK(so, 1); 5153 SCTP_TCB_LOCK(stcb); 5154 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5155 #endif 5156 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 5157 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5158 SCTP_SOCKET_UNLOCK(so, 1); 5159 #endif 5160 *offset = length; 5161 return (NULL); 5162 } 5163 } 5164 /* He's alive so give him credit */ 5165 if ((stcb) && netp && *netp) { 5166 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5167 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5168 stcb->asoc.overall_error_count, 5169 0, 5170 SCTP_FROM_SCTP_INPUT, 5171 __LINE__); 5172 } 5173 stcb->asoc.overall_error_count = 0; 5174 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp); 5175 } 5176 break; 5177 case SCTP_ECN_ECHO: 5178 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-ECHO\n"); 5179 /* He's alive so give him credit */ 5180 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) { 5181 /* Its not ours */ 5182 if (locked_tcb) { 5183 SCTP_TCB_UNLOCK(locked_tcb); 5184 } 5185 *offset = length; 5186 return (NULL); 5187 } 5188 if (stcb) { 5189 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5190 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5191 stcb->asoc.overall_error_count, 5192 0, 5193 SCTP_FROM_SCTP_INPUT, 5194 __LINE__); 5195 } 5196 stcb->asoc.overall_error_count = 0; 5197 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, 5198 stcb); 5199 ecne_seen = 1; 5200 } 5201 break; 5202 case SCTP_ECN_CWR: 5203 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-CWR\n"); 5204 /* He's alive so give him credit */ 5205 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) { 5206 /* Its not ours */ 5207 if (locked_tcb) { 5208 SCTP_TCB_UNLOCK(locked_tcb); 5209 } 5210 *offset = length; 5211 return (NULL); 5212 } 5213 if (stcb) { 5214 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5215 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5216 stcb->asoc.overall_error_count, 5217 0, 5218 SCTP_FROM_SCTP_INPUT, 5219 __LINE__); 5220 } 5221 stcb->asoc.overall_error_count = 0; 5222 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp); 5223 } 5224 break; 5225 case SCTP_SHUTDOWN_COMPLETE: 5226 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-COMPLETE, stcb %p\n", stcb); 5227 /* must be first and only chunk */ 5228 if ((num_chunks > 1) || 5229 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 5230 *offset = length; 5231 if (locked_tcb) { 5232 SCTP_TCB_UNLOCK(locked_tcb); 5233 } 5234 return (NULL); 5235 } 5236 if ((stcb) && netp && *netp) { 5237 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch, 5238 stcb, *netp); 5239 } 5240 *offset = length; 5241 return (NULL); 5242 break; 5243 case SCTP_ASCONF: 5244 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n"); 5245 /* He's alive so give him credit */ 5246 if (stcb) { 5247 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5248 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5249 stcb->asoc.overall_error_count, 5250 0, 5251 SCTP_FROM_SCTP_INPUT, 5252 __LINE__); 5253 } 5254 stcb->asoc.overall_error_count = 0; 5255 sctp_handle_asconf(m, *offset, 5256 (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0); 5257 asconf_cnt++; 5258 } 5259 break; 5260 case SCTP_ASCONF_ACK: 5261 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF-ACK\n"); 5262 if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) { 5263 /* Its not ours */ 5264 if (locked_tcb) { 5265 SCTP_TCB_UNLOCK(locked_tcb); 5266 } 5267 *offset = length; 5268 return (NULL); 5269 } 5270 if ((stcb) && netp && *netp) { 5271 /* He's alive so give him credit */ 5272 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5273 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5274 stcb->asoc.overall_error_count, 5275 0, 5276 SCTP_FROM_SCTP_INPUT, 5277 __LINE__); 5278 } 5279 stcb->asoc.overall_error_count = 0; 5280 sctp_handle_asconf_ack(m, *offset, 5281 (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock); 5282 if (abort_no_unlock) 5283 return (NULL); 5284 } 5285 break; 5286 case SCTP_FORWARD_CUM_TSN: 5287 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD-TSN\n"); 5288 if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) { 5289 /* Its not ours */ 5290 if (locked_tcb) { 5291 SCTP_TCB_UNLOCK(locked_tcb); 5292 } 5293 *offset = length; 5294 return (NULL); 5295 } 5296 /* He's alive so give him credit */ 5297 if (stcb) { 5298 int abort_flag = 0; 5299 5300 stcb->asoc.overall_error_count = 0; 5301 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5302 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5303 stcb->asoc.overall_error_count, 5304 0, 5305 SCTP_FROM_SCTP_INPUT, 5306 __LINE__); 5307 } 5308 *fwd_tsn_seen = 1; 5309 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5310 /* We are not interested anymore */ 5311 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5312 so = SCTP_INP_SO(inp); 5313 atomic_add_int(&stcb->asoc.refcnt, 1); 5314 SCTP_TCB_UNLOCK(stcb); 5315 SCTP_SOCKET_LOCK(so, 1); 5316 SCTP_TCB_LOCK(stcb); 5317 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5318 #endif 5319 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_29); 5320 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5321 SCTP_SOCKET_UNLOCK(so, 1); 5322 #endif 5323 *offset = length; 5324 return (NULL); 5325 } 5326 sctp_handle_forward_tsn(stcb, 5327 (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset); 5328 if (abort_flag) { 5329 *offset = length; 5330 return (NULL); 5331 } else { 5332 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5333 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5334 stcb->asoc.overall_error_count, 5335 0, 5336 SCTP_FROM_SCTP_INPUT, 5337 __LINE__); 5338 } 5339 stcb->asoc.overall_error_count = 0; 5340 } 5341 5342 } 5343 break; 5344 case SCTP_STREAM_RESET: 5345 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n"); 5346 if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) { 5347 /* Its not ours */ 5348 if (locked_tcb) { 5349 SCTP_TCB_UNLOCK(locked_tcb); 5350 } 5351 *offset = length; 5352 return (NULL); 5353 } 5354 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5355 /* We are not interested anymore */ 5356 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5357 so = SCTP_INP_SO(inp); 5358 atomic_add_int(&stcb->asoc.refcnt, 1); 5359 SCTP_TCB_UNLOCK(stcb); 5360 SCTP_SOCKET_LOCK(so, 1); 5361 SCTP_TCB_LOCK(stcb); 5362 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5363 #endif 5364 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_30); 5365 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5366 SCTP_SOCKET_UNLOCK(so, 1); 5367 #endif 5368 *offset = length; 5369 return (NULL); 5370 } 5371 if (stcb->asoc.peer_supports_strreset == 0) { 5372 /* 5373 * hmm, peer should have announced this, but 5374 * we will turn it on since he is sending us 5375 * a stream reset. 5376 */ 5377 stcb->asoc.peer_supports_strreset = 1; 5378 } 5379 if (sctp_handle_stream_reset(stcb, m, *offset, (struct sctp_stream_reset_out_req *)ch)) { 5380 /* stop processing */ 5381 *offset = length; 5382 return (NULL); 5383 } 5384 break; 5385 case SCTP_PACKET_DROPPED: 5386 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n"); 5387 /* re-get it all please */ 5388 if (chk_length < sizeof(struct sctp_pktdrop_chunk)) { 5389 /* Its not ours */ 5390 if (locked_tcb) { 5391 SCTP_TCB_UNLOCK(locked_tcb); 5392 } 5393 *offset = length; 5394 return (NULL); 5395 } 5396 if (ch && (stcb) && netp && (*netp)) { 5397 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch, 5398 stcb, *netp, 5399 min(chk_length, (sizeof(chunk_buf) - 4))); 5400 5401 } 5402 break; 5403 5404 case SCTP_AUTHENTICATION: 5405 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n"); 5406 if (SCTP_BASE_SYSCTL(sctp_auth_disable)) 5407 goto unknown_chunk; 5408 5409 if (stcb == NULL) { 5410 /* save the first AUTH for later processing */ 5411 if (auth_skipped == 0) { 5412 auth_offset = *offset; 5413 auth_len = chk_length; 5414 auth_skipped = 1; 5415 } 5416 /* skip this chunk (temporarily) */ 5417 goto next_chunk; 5418 } 5419 if ((chk_length < (sizeof(struct sctp_auth_chunk))) || 5420 (chk_length > (sizeof(struct sctp_auth_chunk) + 5421 SCTP_AUTH_DIGEST_LEN_MAX))) { 5422 /* Its not ours */ 5423 if (locked_tcb) { 5424 SCTP_TCB_UNLOCK(locked_tcb); 5425 } 5426 *offset = length; 5427 return (NULL); 5428 } 5429 if (got_auth == 1) { 5430 /* skip this chunk... it's already auth'd */ 5431 goto next_chunk; 5432 } 5433 got_auth = 1; 5434 if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch, 5435 m, *offset)) { 5436 /* auth HMAC failed so dump the packet */ 5437 *offset = length; 5438 return (stcb); 5439 } else { 5440 /* remaining chunks are HMAC checked */ 5441 stcb->asoc.authenticated = 1; 5442 } 5443 break; 5444 5445 default: 5446 unknown_chunk: 5447 /* it's an unknown chunk! */ 5448 if ((ch->chunk_type & 0x40) && (stcb != NULL)) { 5449 struct mbuf *mm; 5450 struct sctp_paramhdr *phd; 5451 5452 mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 5453 0, M_DONTWAIT, 1, MT_DATA); 5454 if (mm) { 5455 phd = mtod(mm, struct sctp_paramhdr *); 5456 /* 5457 * We cheat and use param type since 5458 * we did not bother to define a 5459 * error cause struct. They are the 5460 * same basic format with different 5461 * names. 5462 */ 5463 phd->param_type = htons(SCTP_CAUSE_UNRECOG_CHUNK); 5464 phd->param_length = htons(chk_length + sizeof(*phd)); 5465 SCTP_BUF_LEN(mm) = sizeof(*phd); 5466 SCTP_BUF_NEXT(mm) = SCTP_M_COPYM(m, *offset, chk_length, M_DONTWAIT); 5467 if (SCTP_BUF_NEXT(mm)) { 5468 if (sctp_pad_lastmbuf(SCTP_BUF_NEXT(mm), SCTP_SIZE32(chk_length) - chk_length, NULL)) { 5469 sctp_m_freem(mm); 5470 } else { 5471 #ifdef SCTP_MBUF_LOGGING 5472 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5473 struct mbuf *mat; 5474 5475 for (mat = SCTP_BUF_NEXT(mm); mat; mat = SCTP_BUF_NEXT(mat)) { 5476 if (SCTP_BUF_IS_EXTENDED(mat)) { 5477 sctp_log_mb(mat, SCTP_MBUF_ICOPY); 5478 } 5479 } 5480 } 5481 #endif 5482 sctp_queue_op_err(stcb, mm); 5483 } 5484 } else { 5485 sctp_m_freem(mm); 5486 } 5487 } 5488 } 5489 if ((ch->chunk_type & 0x80) == 0) { 5490 /* discard this packet */ 5491 *offset = length; 5492 return (stcb); 5493 } /* else skip this bad chunk and continue... */ 5494 break; 5495 } /* switch (ch->chunk_type) */ 5496 5497 5498 next_chunk: 5499 /* get the next chunk */ 5500 *offset += SCTP_SIZE32(chk_length); 5501 if (*offset >= length) { 5502 /* no more data left in the mbuf chain */ 5503 break; 5504 } 5505 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 5506 sizeof(struct sctp_chunkhdr), chunk_buf); 5507 if (ch == NULL) { 5508 if (locked_tcb) { 5509 SCTP_TCB_UNLOCK(locked_tcb); 5510 } 5511 *offset = length; 5512 return (NULL); 5513 } 5514 } /* while */ 5515 5516 if (asconf_cnt > 0 && stcb != NULL) { 5517 sctp_send_asconf_ack(stcb); 5518 } 5519 return (stcb); 5520 } 5521 5522 5523 #ifdef INVARIANTS 5524 #ifdef __GNUC__ 5525 __attribute__((noinline)) 5526 #endif 5527 void 5528 sctp_validate_no_locks(struct sctp_inpcb *inp) 5529 { 5530 struct sctp_tcb *lstcb; 5531 5532 LIST_FOREACH(lstcb, &inp->sctp_asoc_list, sctp_tcblist) { 5533 if (mtx_owned(&lstcb->tcb_mtx)) { 5534 panic("Own lock on stcb at return from input"); 5535 } 5536 } 5537 if (mtx_owned(&inp->inp_create_mtx)) { 5538 panic("Own create lock on inp"); 5539 } 5540 if (mtx_owned(&inp->inp_mtx)) { 5541 panic("Own inp lock on inp"); 5542 } 5543 } 5544 5545 #endif 5546 5547 /* 5548 * common input chunk processing (v4 and v6) 5549 */ 5550 void 5551 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, 5552 int length, struct sctphdr *sh, struct sctp_chunkhdr *ch, 5553 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets *net, 5554 uint8_t ecn_bits, uint32_t vrf_id, uint16_t port) 5555 { 5556 /* 5557 * Control chunk processing 5558 */ 5559 uint32_t high_tsn; 5560 int fwd_tsn_seen = 0, data_processed = 0; 5561 struct mbuf *m = *mm; 5562 int un_sent; 5563 int cnt_ctrl_ready = 0; 5564 5565 SCTP_STAT_INCR(sctps_recvdatagrams); 5566 #ifdef SCTP_AUDITING_ENABLED 5567 sctp_audit_log(0xE0, 1); 5568 sctp_auditing(0, inp, stcb, net); 5569 #endif 5570 5571 SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n", 5572 m, iphlen, offset, length, stcb); 5573 if (stcb) { 5574 /* always clear this before beginning a packet */ 5575 stcb->asoc.authenticated = 0; 5576 stcb->asoc.seen_a_sack_this_pkt = 0; 5577 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n", 5578 stcb, stcb->asoc.state); 5579 5580 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) || 5581 (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) { 5582 /*- 5583 * If we hit here, we had a ref count 5584 * up when the assoc was aborted and the 5585 * timer is clearing out the assoc, we should 5586 * NOT respond to any packet.. its OOTB. 5587 */ 5588 SCTP_TCB_UNLOCK(stcb); 5589 sctp_handle_ootb(m, iphlen, offset, sh, inp, 5590 vrf_id, port); 5591 goto out_now; 5592 } 5593 } 5594 if (IS_SCTP_CONTROL(ch)) { 5595 /* process the control portion of the SCTP packet */ 5596 /* sa_ignore NO_NULL_CHK */ 5597 stcb = sctp_process_control(m, iphlen, &offset, length, sh, ch, 5598 inp, stcb, &net, &fwd_tsn_seen, vrf_id, port); 5599 if (stcb) { 5600 /* 5601 * This covers us if the cookie-echo was there and 5602 * it changes our INP. 5603 */ 5604 inp = stcb->sctp_ep; 5605 if ((net) && (port)) { 5606 if (net->port == 0) { 5607 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr)); 5608 } 5609 net->port = port; 5610 } 5611 } 5612 } else { 5613 /* 5614 * no control chunks, so pre-process DATA chunks (these 5615 * checks are taken care of by control processing) 5616 */ 5617 5618 /* 5619 * if DATA only packet, and auth is required, then punt... 5620 * can't have authenticated without any AUTH (control) 5621 * chunks 5622 */ 5623 if ((stcb != NULL) && 5624 !SCTP_BASE_SYSCTL(sctp_auth_disable) && 5625 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) { 5626 /* "silently" ignore */ 5627 SCTP_STAT_INCR(sctps_recvauthmissing); 5628 SCTP_TCB_UNLOCK(stcb); 5629 goto out_now; 5630 } 5631 if (stcb == NULL) { 5632 /* out of the blue DATA chunk */ 5633 sctp_handle_ootb(m, iphlen, offset, sh, inp, 5634 vrf_id, port); 5635 goto out_now; 5636 } 5637 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) { 5638 /* v_tag mismatch! */ 5639 SCTP_STAT_INCR(sctps_badvtag); 5640 SCTP_TCB_UNLOCK(stcb); 5641 goto out_now; 5642 } 5643 } 5644 5645 if (stcb == NULL) { 5646 /* 5647 * no valid TCB for this packet, or we found it's a bad 5648 * packet while processing control, or we're done with this 5649 * packet (done or skip rest of data), so we drop it... 5650 */ 5651 goto out_now; 5652 } 5653 /* 5654 * DATA chunk processing 5655 */ 5656 /* plow through the data chunks while length > offset */ 5657 5658 /* 5659 * Rest should be DATA only. Check authentication state if AUTH for 5660 * DATA is required. 5661 */ 5662 if ((length > offset) && 5663 (stcb != NULL) && 5664 !SCTP_BASE_SYSCTL(sctp_auth_disable) && 5665 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) && 5666 !stcb->asoc.authenticated) { 5667 /* "silently" ignore */ 5668 SCTP_STAT_INCR(sctps_recvauthmissing); 5669 SCTPDBG(SCTP_DEBUG_AUTH1, 5670 "Data chunk requires AUTH, skipped\n"); 5671 goto trigger_send; 5672 } 5673 if (length > offset) { 5674 int retval; 5675 5676 /* 5677 * First check to make sure our state is correct. We would 5678 * not get here unless we really did have a tag, so we don't 5679 * abort if this happens, just dump the chunk silently. 5680 */ 5681 switch (SCTP_GET_STATE(&stcb->asoc)) { 5682 case SCTP_STATE_COOKIE_ECHOED: 5683 /* 5684 * we consider data with valid tags in this state 5685 * shows us the cookie-ack was lost. Imply it was 5686 * there. 5687 */ 5688 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5689 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5690 stcb->asoc.overall_error_count, 5691 0, 5692 SCTP_FROM_SCTP_INPUT, 5693 __LINE__); 5694 } 5695 stcb->asoc.overall_error_count = 0; 5696 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net); 5697 break; 5698 case SCTP_STATE_COOKIE_WAIT: 5699 /* 5700 * We consider OOTB any data sent during asoc setup. 5701 */ 5702 sctp_handle_ootb(m, iphlen, offset, sh, inp, 5703 vrf_id, port); 5704 SCTP_TCB_UNLOCK(stcb); 5705 goto out_now; 5706 /* sa_ignore NOTREACHED */ 5707 break; 5708 case SCTP_STATE_EMPTY: /* should not happen */ 5709 case SCTP_STATE_INUSE: /* should not happen */ 5710 case SCTP_STATE_SHUTDOWN_RECEIVED: /* This is a peer error */ 5711 case SCTP_STATE_SHUTDOWN_ACK_SENT: 5712 default: 5713 SCTP_TCB_UNLOCK(stcb); 5714 goto out_now; 5715 /* sa_ignore NOTREACHED */ 5716 break; 5717 case SCTP_STATE_OPEN: 5718 case SCTP_STATE_SHUTDOWN_SENT: 5719 break; 5720 } 5721 /* plow through the data chunks while length > offset */ 5722 retval = sctp_process_data(mm, iphlen, &offset, length, sh, 5723 inp, stcb, net, &high_tsn); 5724 if (retval == 2) { 5725 /* 5726 * The association aborted, NO UNLOCK needed since 5727 * the association is destroyed. 5728 */ 5729 goto out_now; 5730 } 5731 data_processed = 1; 5732 /* 5733 * Anything important needs to have been m_copy'ed in 5734 * process_data 5735 */ 5736 } 5737 /* take care of ecn */ 5738 if ((data_processed == 1) && 5739 (stcb->asoc.ecn_allowed == 1) && 5740 ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) { 5741 /* Yep, we need to add a ECNE */ 5742 sctp_send_ecn_echo(stcb, net, high_tsn); 5743 } 5744 if ((data_processed == 0) && (fwd_tsn_seen)) { 5745 int was_a_gap; 5746 uint32_t highest_tsn; 5747 5748 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) { 5749 highest_tsn = stcb->asoc.highest_tsn_inside_nr_map; 5750 } else { 5751 highest_tsn = stcb->asoc.highest_tsn_inside_map; 5752 } 5753 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn); 5754 stcb->asoc.send_sack = 1; 5755 sctp_sack_check(stcb, was_a_gap); 5756 } else if (fwd_tsn_seen) { 5757 stcb->asoc.send_sack = 1; 5758 } 5759 /* trigger send of any chunks in queue... */ 5760 trigger_send: 5761 #ifdef SCTP_AUDITING_ENABLED 5762 sctp_audit_log(0xE0, 2); 5763 sctp_auditing(1, inp, stcb, net); 5764 #endif 5765 SCTPDBG(SCTP_DEBUG_INPUT1, 5766 "Check for chunk output prw:%d tqe:%d tf=%d\n", 5767 stcb->asoc.peers_rwnd, 5768 TAILQ_EMPTY(&stcb->asoc.control_send_queue), 5769 stcb->asoc.total_flight); 5770 un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight); 5771 if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 5772 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq; 5773 } 5774 if (cnt_ctrl_ready || 5775 ((un_sent) && 5776 (stcb->asoc.peers_rwnd > 0 || 5777 (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) { 5778 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n"); 5779 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 5780 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n"); 5781 } 5782 #ifdef SCTP_AUDITING_ENABLED 5783 sctp_audit_log(0xE0, 3); 5784 sctp_auditing(2, inp, stcb, net); 5785 #endif 5786 SCTP_TCB_UNLOCK(stcb); 5787 out_now: 5788 #ifdef INVARIANTS 5789 sctp_validate_no_locks(inp); 5790 #endif 5791 return; 5792 } 5793 5794 #if 0 5795 static void 5796 sctp_print_mbuf_chain(struct mbuf *m) 5797 { 5798 for (; m; m = SCTP_BUF_NEXT(m)) { 5799 SCTP_PRINTF("%p: m_len = %ld\n", m, SCTP_BUF_LEN(m)); 5800 if (SCTP_BUF_IS_EXTENDED(m)) 5801 SCTP_PRINTF("%p: extend_size = %d\n", m, SCTP_BUF_EXTEND_SIZE(m)); 5802 } 5803 } 5804 5805 #endif 5806 5807 #ifdef INET 5808 void 5809 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port) 5810 { 5811 struct mbuf *m; 5812 int iphlen; 5813 uint32_t vrf_id = 0; 5814 uint8_t ecn_bits; 5815 struct ip *ip; 5816 struct sctphdr *sh; 5817 struct sctp_inpcb *inp = NULL; 5818 struct sctp_nets *net; 5819 struct sctp_tcb *stcb = NULL; 5820 struct sctp_chunkhdr *ch; 5821 int refcount_up = 0; 5822 int length, mlen, offset; 5823 5824 #if !defined(SCTP_WITH_NO_CSUM) 5825 uint32_t check, calc_check; 5826 5827 #endif 5828 5829 if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) { 5830 SCTP_RELEASE_PKT(i_pak); 5831 return; 5832 } 5833 mlen = SCTP_HEADER_LEN(i_pak); 5834 iphlen = off; 5835 m = SCTP_HEADER_TO_CHAIN(i_pak); 5836 5837 net = NULL; 5838 SCTP_STAT_INCR(sctps_recvpackets); 5839 SCTP_STAT_INCR_COUNTER64(sctps_inpackets); 5840 5841 5842 #ifdef SCTP_MBUF_LOGGING 5843 /* Log in any input mbufs */ 5844 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5845 struct mbuf *mat; 5846 5847 for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) { 5848 if (SCTP_BUF_IS_EXTENDED(mat)) { 5849 sctp_log_mb(mat, SCTP_MBUF_INPUT); 5850 } 5851 } 5852 } 5853 #endif 5854 #ifdef SCTP_PACKET_LOGGING 5855 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) 5856 sctp_packet_log(m, mlen); 5857 #endif 5858 /* 5859 * Must take out the iphlen, since mlen expects this (only effect lb 5860 * case) 5861 */ 5862 mlen -= iphlen; 5863 5864 /* 5865 * Get IP, SCTP, and first chunk header together in first mbuf. 5866 */ 5867 ip = mtod(m, struct ip *); 5868 offset = iphlen + sizeof(*sh) + sizeof(*ch); 5869 if (SCTP_BUF_LEN(m) < offset) { 5870 if ((m = m_pullup(m, offset)) == 0) { 5871 SCTP_STAT_INCR(sctps_hdrops); 5872 return; 5873 } 5874 ip = mtod(m, struct ip *); 5875 } 5876 /* validate mbuf chain length with IP payload length */ 5877 if (mlen < (SCTP_GET_IPV4_LENGTH(ip) - iphlen)) { 5878 SCTP_STAT_INCR(sctps_hdrops); 5879 goto bad; 5880 } 5881 sh = (struct sctphdr *)((caddr_t)ip + iphlen); 5882 ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(*sh)); 5883 SCTPDBG(SCTP_DEBUG_INPUT1, 5884 "sctp_input() length:%d iphlen:%d\n", mlen, iphlen); 5885 5886 /* SCTP does not allow broadcasts or multicasts */ 5887 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) { 5888 goto bad; 5889 } 5890 if (SCTP_IS_IT_BROADCAST(ip->ip_dst, m)) { 5891 /* 5892 * We only look at broadcast if its a front state, All 5893 * others we will not have a tcb for anyway. 5894 */ 5895 goto bad; 5896 } 5897 /* validate SCTP checksum */ 5898 SCTPDBG(SCTP_DEBUG_CRCOFFLOAD, 5899 "sctp_input(): Packet of length %d received on %s with csum_flags 0x%x.\n", 5900 m->m_pkthdr.len, 5901 if_name(m->m_pkthdr.rcvif), 5902 m->m_pkthdr.csum_flags); 5903 #if defined(SCTP_WITH_NO_CSUM) 5904 SCTP_STAT_INCR(sctps_recvnocrc); 5905 #else 5906 if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) { 5907 SCTP_STAT_INCR(sctps_recvhwcrc); 5908 goto sctp_skip_csum_4; 5909 } 5910 check = sh->checksum; /* save incoming checksum */ 5911 sh->checksum = 0; /* prepare for calc */ 5912 calc_check = sctp_calculate_cksum(m, iphlen); 5913 sh->checksum = check; 5914 SCTP_STAT_INCR(sctps_recvswcrc); 5915 if (calc_check != check) { 5916 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x m:%p mlen:%d iphlen:%d\n", 5917 calc_check, check, m, mlen, iphlen); 5918 5919 stcb = sctp_findassociation_addr(m, 5920 offset - sizeof(*ch), 5921 sh, ch, &inp, &net, 5922 vrf_id); 5923 if ((net) && (port)) { 5924 if (net->port == 0) { 5925 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr)); 5926 } 5927 net->port = port; 5928 } 5929 if ((net != NULL) && (m->m_flags & M_FLOWID)) { 5930 net->flowid = m->m_pkthdr.flowid; 5931 #ifdef INVARIANTS 5932 net->flowidset = 1; 5933 #endif 5934 } 5935 if ((inp) && (stcb)) { 5936 sctp_send_packet_dropped(stcb, net, m, iphlen, 1); 5937 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED); 5938 } else if ((inp != NULL) && (stcb == NULL)) { 5939 refcount_up = 1; 5940 } 5941 SCTP_STAT_INCR(sctps_badsum); 5942 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors); 5943 goto bad; 5944 } 5945 sctp_skip_csum_4: 5946 #endif 5947 /* destination port of 0 is illegal, based on RFC2960. */ 5948 if (sh->dest_port == 0) { 5949 SCTP_STAT_INCR(sctps_hdrops); 5950 goto bad; 5951 } 5952 /* 5953 * Locate pcb and tcb for datagram sctp_findassociation_addr() wants 5954 * IP/SCTP/first chunk header... 5955 */ 5956 stcb = sctp_findassociation_addr(m, offset - sizeof(*ch), 5957 sh, ch, &inp, &net, vrf_id); 5958 if ((net) && (port)) { 5959 if (net->port == 0) { 5960 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr)); 5961 } 5962 net->port = port; 5963 } 5964 if ((net != NULL) && (m->m_flags & M_FLOWID)) { 5965 net->flowid = m->m_pkthdr.flowid; 5966 #ifdef INVARIANTS 5967 net->flowidset = 1; 5968 #endif 5969 } 5970 /* inp's ref-count increased && stcb locked */ 5971 if (inp == NULL) { 5972 struct sctp_init_chunk *init_chk, chunk_buf; 5973 5974 SCTP_STAT_INCR(sctps_noport); 5975 #ifdef ICMP_BANDLIM 5976 /* 5977 * we use the bandwidth limiting to protect against sending 5978 * too many ABORTS all at once. In this case these count the 5979 * same as an ICMP message. 5980 */ 5981 if (badport_bandlim(0) < 0) 5982 goto bad; 5983 #endif /* ICMP_BANDLIM */ 5984 SCTPDBG(SCTP_DEBUG_INPUT1, 5985 "Sending a ABORT from packet entry!\n"); 5986 if (ch->chunk_type == SCTP_INITIATION) { 5987 /* 5988 * we do a trick here to get the INIT tag, dig in 5989 * and get the tag from the INIT and put it in the 5990 * common header. 5991 */ 5992 init_chk = (struct sctp_init_chunk *)sctp_m_getptr(m, 5993 iphlen + sizeof(*sh), sizeof(*init_chk), 5994 (uint8_t *) & chunk_buf); 5995 if (init_chk != NULL) 5996 sh->v_tag = init_chk->init.initiate_tag; 5997 } 5998 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 5999 sctp_send_shutdown_complete2(m, sh, vrf_id, port); 6000 goto bad; 6001 } 6002 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) { 6003 goto bad; 6004 } 6005 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) { 6006 if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) || 6007 ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) && 6008 (ch->chunk_type != SCTP_INIT))) { 6009 sctp_send_abort(m, iphlen, sh, 0, NULL, vrf_id, port); 6010 } 6011 } 6012 goto bad; 6013 } else if (stcb == NULL) { 6014 refcount_up = 1; 6015 } 6016 #ifdef IPSEC 6017 /* 6018 * I very much doubt any of the IPSEC stuff will work but I have no 6019 * idea, so I will leave it in place. 6020 */ 6021 if (inp && ipsec4_in_reject(m, &inp->ip_inp.inp)) { 6022 MODULE_GLOBAL(ipsec4stat).in_polvio++; 6023 SCTP_STAT_INCR(sctps_hdrops); 6024 goto bad; 6025 } 6026 #endif /* IPSEC */ 6027 6028 /* 6029 * common chunk processing 6030 */ 6031 length = ip->ip_len + iphlen; 6032 offset -= sizeof(struct sctp_chunkhdr); 6033 6034 ecn_bits = ip->ip_tos; 6035 6036 /* sa_ignore NO_NULL_CHK */ 6037 sctp_common_input_processing(&m, iphlen, offset, length, sh, ch, 6038 inp, stcb, net, ecn_bits, vrf_id, port); 6039 /* inp's ref-count reduced && stcb unlocked */ 6040 if (m) { 6041 sctp_m_freem(m); 6042 } 6043 if ((inp) && (refcount_up)) { 6044 /* reduce ref-count */ 6045 SCTP_INP_DECR_REF(inp); 6046 } 6047 return; 6048 bad: 6049 if (stcb) { 6050 SCTP_TCB_UNLOCK(stcb); 6051 } 6052 if ((inp) && (refcount_up)) { 6053 /* reduce ref-count */ 6054 SCTP_INP_DECR_REF(inp); 6055 } 6056 if (m) { 6057 sctp_m_freem(m); 6058 } 6059 return; 6060 } 6061 6062 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP) 6063 extern int *sctp_cpuarry; 6064 6065 #endif 6066 6067 void 6068 sctp_input(struct mbuf *m, int off) 6069 { 6070 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP) 6071 struct ip *ip; 6072 struct sctphdr *sh; 6073 int offset; 6074 int cpu_to_use; 6075 uint32_t flowid, tag; 6076 6077 if (mp_ncpus > 1) { 6078 if (m->m_flags & M_FLOWID) { 6079 flowid = m->m_pkthdr.flowid; 6080 } else { 6081 /* 6082 * No flow id built by lower layers fix it so we 6083 * create one. 6084 */ 6085 ip = mtod(m, struct ip *); 6086 offset = off + sizeof(*sh); 6087 if (SCTP_BUF_LEN(m) < offset) { 6088 if ((m = m_pullup(m, offset)) == 0) { 6089 SCTP_STAT_INCR(sctps_hdrops); 6090 return; 6091 } 6092 ip = mtod(m, struct ip *); 6093 } 6094 sh = (struct sctphdr *)((caddr_t)ip + off); 6095 tag = htonl(sh->v_tag); 6096 flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port); 6097 m->m_pkthdr.flowid = flowid; 6098 m->m_flags |= M_FLOWID; 6099 } 6100 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus]; 6101 sctp_queue_to_mcore(m, off, cpu_to_use); 6102 return; 6103 } 6104 #endif 6105 sctp_input_with_port(m, off, 0); 6106 } 6107 6108 #endif 6109