1 /*- 2 * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved. 3 * Copyright (c) 2008-2011, by Randall Stewart. All rights reserved. 4 * Copyright (c) 2008-2011, 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 /* $KAME: sctp_input.c,v 1.27 2005/03/06 16:04:17 itojun Exp $ */ 34 35 #include <sys/cdefs.h> 36 __FBSDID("$FreeBSD$"); 37 38 #include <netinet/sctp_os.h> 39 #include <netinet/sctp_var.h> 40 #include <netinet/sctp_sysctl.h> 41 #include <netinet/sctp_pcb.h> 42 #include <netinet/sctp_header.h> 43 #include <netinet/sctputil.h> 44 #include <netinet/sctp_output.h> 45 #include <netinet/sctp_input.h> 46 #include <netinet/sctp_auth.h> 47 #include <netinet/sctp_indata.h> 48 #include <netinet/sctp_asconf.h> 49 #include <netinet/sctp_bsd_addr.h> 50 #include <netinet/sctp_timer.h> 51 #include <netinet/sctp_crc32.h> 52 #include <netinet/udp.h> 53 #include <sys/smp.h> 54 55 56 57 static void 58 sctp_stop_all_cookie_timers(struct sctp_tcb *stcb) 59 { 60 struct sctp_nets *net; 61 62 /* 63 * This now not only stops all cookie timers it also stops any INIT 64 * timers as well. This will make sure that the timers are stopped 65 * in all collision cases. 66 */ 67 SCTP_TCB_LOCK_ASSERT(stcb); 68 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 69 if (net->rxt_timer.type == SCTP_TIMER_TYPE_COOKIE) { 70 sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE, 71 stcb->sctp_ep, 72 stcb, 73 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_1); 74 } else if (net->rxt_timer.type == SCTP_TIMER_TYPE_INIT) { 75 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, 76 stcb->sctp_ep, 77 stcb, 78 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_2); 79 } 80 } 81 } 82 83 /* INIT handler */ 84 static void 85 sctp_handle_init(struct mbuf *m, int iphlen, int offset, struct sctphdr *sh, 86 struct sctp_init_chunk *cp, struct sctp_inpcb *inp, struct sctp_tcb *stcb, 87 struct sctp_nets *net, int *abort_no_unlock, uint32_t vrf_id, uint16_t port) 88 { 89 struct sctp_init *init; 90 struct mbuf *op_err; 91 uint32_t init_limit; 92 93 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_init: handling INIT tcb:%p\n", 94 stcb); 95 if (stcb == NULL) { 96 SCTP_INP_RLOCK(inp); 97 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 98 goto outnow; 99 } 100 } 101 op_err = NULL; 102 init = &cp->init; 103 /* First are we accepting? */ 104 if ((inp->sctp_socket->so_qlimit == 0) && (stcb == NULL)) { 105 SCTPDBG(SCTP_DEBUG_INPUT2, 106 "sctp_handle_init: Abort, so_qlimit:%d\n", 107 inp->sctp_socket->so_qlimit); 108 /* 109 * FIX ME ?? What about TCP model and we have a 110 * match/restart case? Actually no fix is needed. the lookup 111 * will always find the existing assoc so stcb would not be 112 * NULL. It may be questionable to do this since we COULD 113 * just send back the INIT-ACK and hope that the app did 114 * accept()'s by the time the COOKIE was sent. But there is 115 * a price to pay for COOKIE generation and I don't want to 116 * pay it on the chance that the app will actually do some 117 * accepts(). The App just looses and should NOT be in this 118 * state :-) 119 */ 120 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err, 121 vrf_id, port); 122 if (stcb) 123 *abort_no_unlock = 1; 124 goto outnow; 125 } 126 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_chunk)) { 127 /* Invalid length */ 128 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 129 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err, 130 vrf_id, port); 131 if (stcb) 132 *abort_no_unlock = 1; 133 goto outnow; 134 } 135 /* validate parameters */ 136 if (init->initiate_tag == 0) { 137 /* protocol error... send abort */ 138 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 139 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err, 140 vrf_id, port); 141 if (stcb) 142 *abort_no_unlock = 1; 143 goto outnow; 144 } 145 if (ntohl(init->a_rwnd) < SCTP_MIN_RWND) { 146 /* invalid parameter... send abort */ 147 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 148 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err, 149 vrf_id, port); 150 if (stcb) 151 *abort_no_unlock = 1; 152 goto outnow; 153 } 154 if (init->num_inbound_streams == 0) { 155 /* protocol error... send abort */ 156 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 157 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err, 158 vrf_id, port); 159 if (stcb) 160 *abort_no_unlock = 1; 161 goto outnow; 162 } 163 if (init->num_outbound_streams == 0) { 164 /* protocol error... send abort */ 165 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 166 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err, 167 vrf_id, port); 168 if (stcb) 169 *abort_no_unlock = 1; 170 goto outnow; 171 } 172 init_limit = offset + ntohs(cp->ch.chunk_length); 173 if (sctp_validate_init_auth_params(m, offset + sizeof(*cp), 174 init_limit)) { 175 /* auth parameter(s) error... send abort */ 176 sctp_abort_association(inp, stcb, m, iphlen, sh, NULL, vrf_id, port); 177 if (stcb) 178 *abort_no_unlock = 1; 179 goto outnow; 180 } 181 /* send an INIT-ACK w/cookie */ 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 outnow: 186 if (stcb == NULL) { 187 SCTP_INP_RUNLOCK(inp); 188 } 189 } 190 191 /* 192 * process peer "INIT/INIT-ACK" chunk returns value < 0 on error 193 */ 194 195 int 196 sctp_is_there_unsent_data(struct sctp_tcb *stcb, int so_locked 197 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING) 198 SCTP_UNUSED 199 #endif 200 ) 201 { 202 int unsent_data = 0; 203 unsigned int i; 204 struct sctp_stream_queue_pending *sp; 205 struct sctp_association *asoc; 206 207 /* 208 * This function returns the number of streams that have true unsent 209 * data on them. Note that as it looks through it will clean up any 210 * places that have old data that has been sent but left at top of 211 * stream queue. 212 */ 213 asoc = &stcb->asoc; 214 SCTP_TCB_SEND_LOCK(stcb); 215 if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 216 /* Check to see if some data queued */ 217 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 218 /* sa_ignore FREED_MEMORY */ 219 sp = TAILQ_FIRST(&stcb->asoc.strmout[i].outqueue); 220 if (sp == NULL) { 221 continue; 222 } 223 if ((sp->msg_is_complete) && 224 (sp->length == 0) && 225 (sp->sender_all_done)) { 226 /* 227 * We are doing differed cleanup. Last time 228 * through when we took all the data the 229 * sender_all_done was not set. 230 */ 231 if (sp->put_last_out == 0) { 232 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n"); 233 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n", 234 sp->sender_all_done, 235 sp->length, 236 sp->msg_is_complete, 237 sp->put_last_out); 238 } 239 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1); 240 TAILQ_REMOVE(&stcb->asoc.strmout[i].outqueue, sp, next); 241 if (sp->net) { 242 sctp_free_remote_addr(sp->net); 243 sp->net = NULL; 244 } 245 if (sp->data) { 246 sctp_m_freem(sp->data); 247 sp->data = NULL; 248 } 249 sctp_free_a_strmoq(stcb, sp, so_locked); 250 } else { 251 unsent_data++; 252 break; 253 } 254 } 255 } 256 SCTP_TCB_SEND_UNLOCK(stcb); 257 return (unsent_data); 258 } 259 260 static int 261 sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb, 262 struct sctp_nets *net) 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_DG_FAIL, stcb, 302 SCTP_NOTIFY_DATAGRAM_UNSENT, 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, SCTP_NOTIFY_DATAGRAM_UNSENT, 320 sp, SCTP_SO_NOT_LOCKED); 321 if (sp->data) { 322 sctp_m_freem(sp->data); 323 sp->data = NULL; 324 } 325 if (sp->net) { 326 sctp_free_remote_addr(sp->net); 327 sp->net = NULL; 328 } 329 /* Free the chunk */ 330 sctp_free_a_strmoq(stcb, sp, SCTP_SO_NOT_LOCKED); 331 /* sa_ignore FREED_MEMORY */ 332 } 333 } 334 } 335 /* cut back the count */ 336 asoc->pre_open_streams = newcnt; 337 } 338 SCTP_TCB_SEND_UNLOCK(stcb); 339 asoc->strm_realoutsize = asoc->streamoutcnt = asoc->pre_open_streams; 340 341 /* EY - nr_sack: initialize highest tsn in nr_mapping_array */ 342 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 343 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 344 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 345 } 346 /* This is the next one we expect */ 347 asoc->str_reset_seq_in = asoc->asconf_seq_in + 1; 348 349 asoc->mapping_array_base_tsn = ntohl(init->initial_tsn); 350 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in; 351 352 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 353 /* open the requested streams */ 354 355 if (asoc->strmin != NULL) { 356 /* Free the old ones */ 357 struct sctp_queued_to_read *ctl, *nctl; 358 359 for (i = 0; i < asoc->streamincnt; i++) { 360 TAILQ_FOREACH_SAFE(ctl, &asoc->strmin[i].inqueue, next, nctl) { 361 TAILQ_REMOVE(&asoc->strmin[i].inqueue, ctl, next); 362 sctp_free_remote_addr(ctl->whoFrom); 363 ctl->whoFrom = NULL; 364 sctp_m_freem(ctl->data); 365 ctl->data = NULL; 366 sctp_free_a_readq(stcb, ctl); 367 } 368 } 369 SCTP_FREE(asoc->strmin, SCTP_M_STRMI); 370 } 371 asoc->streamincnt = ntohs(init->num_outbound_streams); 372 if (asoc->streamincnt > MAX_SCTP_STREAMS) { 373 asoc->streamincnt = MAX_SCTP_STREAMS; 374 } 375 SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt * 376 sizeof(struct sctp_stream_in), SCTP_M_STRMI); 377 if (asoc->strmin == NULL) { 378 /* we didn't get memory for the streams! */ 379 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n"); 380 return (-1); 381 } 382 for (i = 0; i < asoc->streamincnt; i++) { 383 asoc->strmin[i].stream_no = i; 384 asoc->strmin[i].last_sequence_delivered = 0xffff; 385 /* 386 * U-stream ranges will be set when the cookie is unpacked. 387 * Or for the INIT sender they are un set (if pr-sctp not 388 * supported) when the INIT-ACK arrives. 389 */ 390 TAILQ_INIT(&asoc->strmin[i].inqueue); 391 asoc->strmin[i].delivery_started = 0; 392 } 393 /* 394 * load_address_from_init will put the addresses into the 395 * association when the COOKIE is processed or the INIT-ACK is 396 * processed. Both types of COOKIE's existing and new call this 397 * routine. It will remove addresses that are no longer in the 398 * association (for the restarting case where addresses are 399 * removed). Up front when the INIT arrives we will discard it if it 400 * is a restart and new addresses have been added. 401 */ 402 /* sa_ignore MEMLEAK */ 403 return (0); 404 } 405 406 /* 407 * INIT-ACK message processing/consumption returns value < 0 on error 408 */ 409 static int 410 sctp_process_init_ack(struct mbuf *m, int iphlen, int offset, 411 struct sctphdr *sh, struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 412 struct sctp_nets *net, int *abort_no_unlock, uint32_t vrf_id) 413 { 414 struct sctp_association *asoc; 415 struct mbuf *op_err; 416 int retval, abort_flag; 417 uint32_t initack_limit; 418 int nat_friendly = 0; 419 420 /* First verify that we have no illegal param's */ 421 abort_flag = 0; 422 op_err = NULL; 423 424 op_err = sctp_arethere_unrecognized_parameters(m, 425 (offset + sizeof(struct sctp_init_chunk)), 426 &abort_flag, (struct sctp_chunkhdr *)cp, &nat_friendly); 427 if (abort_flag) { 428 /* Send an abort and notify peer */ 429 sctp_abort_an_association(stcb->sctp_ep, stcb, SCTP_CAUSE_PROTOCOL_VIOLATION, op_err, SCTP_SO_NOT_LOCKED); 430 *abort_no_unlock = 1; 431 return (-1); 432 } 433 asoc = &stcb->asoc; 434 asoc->peer_supports_nat = (uint8_t) nat_friendly; 435 /* process the peer's parameters in the INIT-ACK */ 436 retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb, net); 437 if (retval < 0) { 438 return (retval); 439 } 440 initack_limit = offset + ntohs(cp->ch.chunk_length); 441 /* load all addresses */ 442 if ((retval = sctp_load_addresses_from_init(stcb, m, iphlen, 443 (offset + sizeof(struct sctp_init_chunk)), initack_limit, sh, 444 NULL))) { 445 /* Huh, we should abort */ 446 SCTPDBG(SCTP_DEBUG_INPUT1, 447 "Load addresses from INIT causes an abort %d\n", 448 retval); 449 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 450 NULL, 0, net->port); 451 *abort_no_unlock = 1; 452 return (-1); 453 } 454 /* if the peer doesn't support asconf, flush the asconf queue */ 455 if (asoc->peer_supports_asconf == 0) { 456 struct sctp_asconf_addr *param, *nparam; 457 458 TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) { 459 TAILQ_REMOVE(&asoc->asconf_queue, param, next); 460 SCTP_FREE(param, SCTP_M_ASC_ADDR); 461 } 462 } 463 stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs, 464 stcb->asoc.local_hmacs); 465 if (op_err) { 466 sctp_queue_op_err(stcb, op_err); 467 /* queuing will steal away the mbuf chain to the out queue */ 468 op_err = NULL; 469 } 470 /* extract the cookie and queue it to "echo" it back... */ 471 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 472 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 473 stcb->asoc.overall_error_count, 474 0, 475 SCTP_FROM_SCTP_INPUT, 476 __LINE__); 477 } 478 stcb->asoc.overall_error_count = 0; 479 net->error_count = 0; 480 481 /* 482 * Cancel the INIT timer, We do this first before queueing the 483 * cookie. We always cancel at the primary to assue that we are 484 * canceling the timer started by the INIT which always goes to the 485 * primary. 486 */ 487 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb, 488 asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4); 489 490 /* calculate the RTO */ 491 net->RTO = sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, sctp_align_safe_nocopy, 492 SCTP_RTT_FROM_NON_DATA); 493 494 retval = sctp_send_cookie_echo(m, offset, stcb, net); 495 if (retval < 0) { 496 /* 497 * No cookie, we probably should send a op error. But in any 498 * case if there is no cookie in the INIT-ACK, we can 499 * abandon the peer, its broke. 500 */ 501 if (retval == -3) { 502 /* We abort with an error of missing mandatory param */ 503 op_err = 504 sctp_generate_invmanparam(SCTP_CAUSE_MISSING_PARAM); 505 if (op_err) { 506 /* 507 * Expand beyond to include the mandatory 508 * param cookie 509 */ 510 struct sctp_inv_mandatory_param *mp; 511 512 SCTP_BUF_LEN(op_err) = 513 sizeof(struct sctp_inv_mandatory_param); 514 mp = mtod(op_err, 515 struct sctp_inv_mandatory_param *); 516 /* Subtract the reserved param */ 517 mp->length = 518 htons(sizeof(struct sctp_inv_mandatory_param) - 2); 519 mp->num_param = htonl(1); 520 mp->param = htons(SCTP_STATE_COOKIE); 521 mp->resv = 0; 522 } 523 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 524 sh, op_err, 0, net->port); 525 *abort_no_unlock = 1; 526 } 527 return (retval); 528 } 529 return (0); 530 } 531 532 static void 533 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp, 534 struct sctp_tcb *stcb, struct sctp_nets *net) 535 { 536 struct sockaddr_storage store; 537 struct sctp_nets *r_net, *f_net; 538 struct timeval tv; 539 int req_prim = 0; 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_WAS_PRIMARY; 603 r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY; 604 f_net = TAILQ_FIRST(&stcb->asoc.nets); 605 if (f_net != r_net) { 606 /* 607 * first one on the list is NOT the primary 608 * sctp_cmpaddr() is much more efficent if 609 * the primary is the first on the list, 610 * make it so. 611 */ 612 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next); 613 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next); 614 } 615 req_prim = 1; 616 } 617 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 618 stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 619 } 620 r_net->error_count = 0; 621 r_net->hb_responded = 1; 622 tv.tv_sec = cp->heartbeat.hb_info.time_value_1; 623 tv.tv_usec = cp->heartbeat.hb_info.time_value_2; 624 if (r_net->dest_state & SCTP_ADDR_NOT_REACHABLE) { 625 r_net->dest_state &= ~SCTP_ADDR_NOT_REACHABLE; 626 r_net->dest_state |= SCTP_ADDR_REACHABLE; 627 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb, 628 SCTP_HEARTBEAT_SUCCESS, (void *)r_net, SCTP_SO_NOT_LOCKED); 629 /* now was it the primary? if so restore */ 630 if (r_net->dest_state & SCTP_ADDR_WAS_PRIMARY) { 631 (void)sctp_set_primary_addr(stcb, (struct sockaddr *)NULL, r_net); 632 } 633 } 634 /* 635 * JRS 5/14/07 - If CMT PF is on and the destination is in PF state, 636 * set the destination to active state and set the cwnd to one or 637 * two MTU's based on whether PF1 or PF2 is being used. If a T3 638 * timer is running, for the destination, stop the timer because a 639 * PF-heartbeat was received. 640 */ 641 if ((stcb->asoc.sctp_cmt_on_off > 0) && 642 (stcb->asoc.sctp_cmt_pf > 0) && 643 ((net->dest_state & SCTP_ADDR_PF) == SCTP_ADDR_PF)) { 644 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) { 645 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 646 stcb, net, 647 SCTP_FROM_SCTP_INPUT + SCTP_LOC_5); 648 } 649 net->dest_state &= ~SCTP_ADDR_PF; 650 net->cwnd = net->mtu * stcb->asoc.sctp_cmt_pf; 651 SCTPDBG(SCTP_DEBUG_INPUT1, "Destination %p moved from PF to reachable with cwnd %d.\n", 652 net, net->cwnd); 653 } 654 /* Now lets do a RTO with this */ 655 r_net->RTO = sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, sctp_align_safe_nocopy, 656 SCTP_RTT_FROM_NON_DATA); 657 /* Mobility adaptation */ 658 if (req_prim) { 659 if ((sctp_is_mobility_feature_on(stcb->sctp_ep, 660 SCTP_MOBILITY_BASE) || 661 sctp_is_mobility_feature_on(stcb->sctp_ep, 662 SCTP_MOBILITY_FASTHANDOFF)) && 663 sctp_is_mobility_feature_on(stcb->sctp_ep, 664 SCTP_MOBILITY_PRIM_DELETED)) { 665 666 sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED, stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_TIMER + SCTP_LOC_7); 667 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 668 SCTP_MOBILITY_FASTHANDOFF)) { 669 sctp_assoc_immediate_retrans(stcb, 670 stcb->asoc.primary_destination); 671 } 672 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 673 SCTP_MOBILITY_BASE)) { 674 sctp_move_chunks_from_net(stcb, 675 stcb->asoc.deleted_primary); 676 } 677 sctp_delete_prim_timer(stcb->sctp_ep, stcb, 678 stcb->asoc.deleted_primary); 679 } 680 } 681 } 682 683 static int 684 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb) 685 { 686 /* 687 * return 0 means we want you to proceed with the abort non-zero 688 * means no abort processing 689 */ 690 struct sctpasochead *head; 691 692 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_WAIT) { 693 /* generate a new vtag and send init */ 694 LIST_REMOVE(stcb, sctp_asocs); 695 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 696 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 697 /* 698 * put it in the bucket in the vtag hash of assoc's for the 699 * system 700 */ 701 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 702 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 703 return (1); 704 } 705 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) { 706 /* 707 * treat like a case where the cookie expired i.e.: - dump 708 * current cookie. - generate a new vtag. - resend init. 709 */ 710 /* generate a new vtag and send init */ 711 LIST_REMOVE(stcb, sctp_asocs); 712 stcb->asoc.state &= ~SCTP_STATE_COOKIE_ECHOED; 713 stcb->asoc.state |= SCTP_STATE_COOKIE_WAIT; 714 sctp_stop_all_cookie_timers(stcb); 715 sctp_toss_old_cookies(stcb, &stcb->asoc); 716 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 717 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 718 /* 719 * put it in the bucket in the vtag hash of assoc's for the 720 * system 721 */ 722 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 723 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 724 return (1); 725 } 726 return (0); 727 } 728 729 static int 730 sctp_handle_nat_missing_state(struct sctp_tcb *stcb, 731 struct sctp_nets *net) 732 { 733 /* 734 * return 0 means we want you to proceed with the abort non-zero 735 * means no abort processing 736 */ 737 if (stcb->asoc.peer_supports_auth == 0) { 738 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n"); 739 return (0); 740 } 741 sctp_asconf_send_nat_state_update(stcb, net); 742 return (1); 743 } 744 745 746 static void 747 sctp_handle_abort(struct sctp_abort_chunk *cp, 748 struct sctp_tcb *stcb, struct sctp_nets *net) 749 { 750 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 751 struct socket *so; 752 753 #endif 754 uint16_t len; 755 756 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n"); 757 if (stcb == NULL) 758 return; 759 760 len = ntohs(cp->ch.chunk_length); 761 if (len > sizeof(struct sctp_chunkhdr)) { 762 /* 763 * Need to check the cause codes for our two magic nat 764 * aborts which don't kill the assoc necessarily. 765 */ 766 struct sctp_abort_chunk *cpnext; 767 struct sctp_missing_nat_state *natc; 768 uint16_t cause; 769 770 cpnext = cp; 771 cpnext++; 772 natc = (struct sctp_missing_nat_state *)cpnext; 773 cause = ntohs(natc->cause); 774 if (cause == SCTP_CAUSE_NAT_COLLIDING_STATE) { 775 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n", 776 cp->ch.chunk_flags); 777 if (sctp_handle_nat_colliding_state(stcb)) { 778 return; 779 } 780 } else if (cause == SCTP_CAUSE_NAT_MISSING_STATE) { 781 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n", 782 cp->ch.chunk_flags); 783 if (sctp_handle_nat_missing_state(stcb, net)) { 784 return; 785 } 786 } 787 } 788 /* stop any receive timers */ 789 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_6); 790 /* notify user of the abort and clean up... */ 791 sctp_abort_notification(stcb, 0, SCTP_SO_NOT_LOCKED); 792 /* free the tcb */ 793 #if defined(SCTP_PANIC_ON_ABORT) 794 printf("stcb:%p state:%d rport:%d net:%p\n", 795 stcb, stcb->asoc.state, stcb->rport, net); 796 if (!(stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET)) { 797 panic("Received an ABORT"); 798 } else { 799 printf("No panic its in state %x closed\n", stcb->asoc.state); 800 } 801 #endif 802 SCTP_STAT_INCR_COUNTER32(sctps_aborted); 803 if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) || 804 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 805 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 806 } 807 #ifdef SCTP_ASOCLOG_OF_TSNS 808 sctp_print_out_track_log(stcb); 809 #endif 810 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 811 so = SCTP_INP_SO(stcb->sctp_ep); 812 atomic_add_int(&stcb->asoc.refcnt, 1); 813 SCTP_TCB_UNLOCK(stcb); 814 SCTP_SOCKET_LOCK(so, 1); 815 SCTP_TCB_LOCK(stcb); 816 atomic_subtract_int(&stcb->asoc.refcnt, 1); 817 #endif 818 stcb->asoc.state |= SCTP_STATE_WAS_ABORTED; 819 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 820 SCTP_FROM_SCTP_INPUT + SCTP_LOC_6); 821 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 822 SCTP_SOCKET_UNLOCK(so, 1); 823 #endif 824 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n"); 825 } 826 827 static void 828 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp, 829 struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag) 830 { 831 struct sctp_association *asoc; 832 int some_on_streamwheel; 833 834 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 835 struct socket *so; 836 837 #endif 838 839 SCTPDBG(SCTP_DEBUG_INPUT2, 840 "sctp_handle_shutdown: handling SHUTDOWN\n"); 841 if (stcb == NULL) 842 return; 843 asoc = &stcb->asoc; 844 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) || 845 (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) { 846 return; 847 } 848 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) { 849 /* Shutdown NOT the expected size */ 850 return; 851 } else { 852 sctp_update_acked(stcb, cp, net, abort_flag); 853 if (*abort_flag) { 854 return; 855 } 856 } 857 if (asoc->control_pdapi) { 858 /* 859 * With a normal shutdown we assume the end of last record. 860 */ 861 SCTP_INP_READ_LOCK(stcb->sctp_ep); 862 asoc->control_pdapi->end_added = 1; 863 asoc->control_pdapi->pdapi_aborted = 1; 864 asoc->control_pdapi = NULL; 865 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 866 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 867 so = SCTP_INP_SO(stcb->sctp_ep); 868 atomic_add_int(&stcb->asoc.refcnt, 1); 869 SCTP_TCB_UNLOCK(stcb); 870 SCTP_SOCKET_LOCK(so, 1); 871 SCTP_TCB_LOCK(stcb); 872 atomic_subtract_int(&stcb->asoc.refcnt, 1); 873 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 874 /* assoc was freed while we were unlocked */ 875 SCTP_SOCKET_UNLOCK(so, 1); 876 return; 877 } 878 #endif 879 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 880 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 881 SCTP_SOCKET_UNLOCK(so, 1); 882 #endif 883 } 884 /* goto SHUTDOWN_RECEIVED state to block new requests */ 885 if (stcb->sctp_socket) { 886 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) && 887 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) && 888 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) { 889 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_RECEIVED); 890 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 891 /* 892 * notify upper layer that peer has initiated a 893 * shutdown 894 */ 895 sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 896 897 /* reset time */ 898 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 899 } 900 } 901 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) { 902 /* 903 * stop the shutdown timer, since we WILL move to 904 * SHUTDOWN-ACK-SENT. 905 */ 906 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_8); 907 } 908 /* Now is there unsent data on a stream somewhere? */ 909 some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED); 910 911 if (!TAILQ_EMPTY(&asoc->send_queue) || 912 !TAILQ_EMPTY(&asoc->sent_queue) || 913 some_on_streamwheel) { 914 /* By returning we will push more data out */ 915 return; 916 } else { 917 /* no outstanding data to send, so move on... */ 918 /* send SHUTDOWN-ACK */ 919 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination); 920 /* move to SHUTDOWN-ACK-SENT state */ 921 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) || 922 (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 923 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 924 } 925 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT); 926 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 927 sctp_stop_timers_for_shutdown(stcb); 928 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, 929 stcb, net); 930 } 931 } 932 933 static void 934 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp, 935 struct sctp_tcb *stcb, 936 struct sctp_nets *net) 937 { 938 struct sctp_association *asoc; 939 940 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 941 struct socket *so; 942 943 so = SCTP_INP_SO(stcb->sctp_ep); 944 #endif 945 SCTPDBG(SCTP_DEBUG_INPUT2, 946 "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n"); 947 if (stcb == NULL) 948 return; 949 950 asoc = &stcb->asoc; 951 /* process according to association state */ 952 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) || 953 (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) { 954 /* unexpected SHUTDOWN-ACK... do OOTB handling... */ 955 sctp_send_shutdown_complete(stcb, net, 1); 956 SCTP_TCB_UNLOCK(stcb); 957 return; 958 } 959 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) && 960 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) { 961 /* unexpected SHUTDOWN-ACK... so ignore... */ 962 SCTP_TCB_UNLOCK(stcb); 963 return; 964 } 965 if (asoc->control_pdapi) { 966 /* 967 * With a normal shutdown we assume the end of last record. 968 */ 969 SCTP_INP_READ_LOCK(stcb->sctp_ep); 970 asoc->control_pdapi->end_added = 1; 971 asoc->control_pdapi->pdapi_aborted = 1; 972 asoc->control_pdapi = NULL; 973 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 974 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 975 atomic_add_int(&stcb->asoc.refcnt, 1); 976 SCTP_TCB_UNLOCK(stcb); 977 SCTP_SOCKET_LOCK(so, 1); 978 SCTP_TCB_LOCK(stcb); 979 atomic_subtract_int(&stcb->asoc.refcnt, 1); 980 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 981 /* assoc was freed while we were unlocked */ 982 SCTP_SOCKET_UNLOCK(so, 1); 983 return; 984 } 985 #endif 986 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 987 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 988 SCTP_SOCKET_UNLOCK(so, 1); 989 #endif 990 } 991 /* are the queues empty? */ 992 if (!TAILQ_EMPTY(&asoc->send_queue) || 993 !TAILQ_EMPTY(&asoc->sent_queue) || 994 !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 995 sctp_report_all_outbound(stcb, 0, SCTP_SO_NOT_LOCKED); 996 } 997 /* stop the timer */ 998 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9); 999 /* send SHUTDOWN-COMPLETE */ 1000 sctp_send_shutdown_complete(stcb, net, 0); 1001 /* notify upper layer protocol */ 1002 if (stcb->sctp_socket) { 1003 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 1004 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1005 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 1006 /* Set the connected flag to disconnected */ 1007 stcb->sctp_ep->sctp_socket->so_snd.sb_cc = 0; 1008 } 1009 } 1010 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 1011 /* free the TCB but first save off the ep */ 1012 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1013 atomic_add_int(&stcb->asoc.refcnt, 1); 1014 SCTP_TCB_UNLOCK(stcb); 1015 SCTP_SOCKET_LOCK(so, 1); 1016 SCTP_TCB_LOCK(stcb); 1017 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1018 #endif 1019 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1020 SCTP_FROM_SCTP_INPUT + SCTP_LOC_10); 1021 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1022 SCTP_SOCKET_UNLOCK(so, 1); 1023 #endif 1024 } 1025 1026 /* 1027 * Skip past the param header and then we will find the chunk that caused the 1028 * problem. There are two possiblities ASCONF or FWD-TSN other than that and 1029 * our peer must be broken. 1030 */ 1031 static void 1032 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr, 1033 struct sctp_nets *net) 1034 { 1035 struct sctp_chunkhdr *chk; 1036 1037 chk = (struct sctp_chunkhdr *)((caddr_t)phdr + sizeof(*phdr)); 1038 switch (chk->chunk_type) { 1039 case SCTP_ASCONF_ACK: 1040 case SCTP_ASCONF: 1041 sctp_asconf_cleanup(stcb, net); 1042 break; 1043 case SCTP_FORWARD_CUM_TSN: 1044 stcb->asoc.peer_supports_prsctp = 0; 1045 break; 1046 default: 1047 SCTPDBG(SCTP_DEBUG_INPUT2, 1048 "Peer does not support chunk type %d(%x)??\n", 1049 chk->chunk_type, (uint32_t) chk->chunk_type); 1050 break; 1051 } 1052 } 1053 1054 /* 1055 * Skip past the param header and then we will find the param that caused the 1056 * problem. There are a number of param's in a ASCONF OR the prsctp param 1057 * these will turn of specific features. 1058 */ 1059 static void 1060 sctp_process_unrecog_param(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr) 1061 { 1062 struct sctp_paramhdr *pbad; 1063 1064 pbad = phdr + 1; 1065 switch (ntohs(pbad->param_type)) { 1066 /* pr-sctp draft */ 1067 case SCTP_PRSCTP_SUPPORTED: 1068 stcb->asoc.peer_supports_prsctp = 0; 1069 break; 1070 case SCTP_SUPPORTED_CHUNK_EXT: 1071 break; 1072 /* draft-ietf-tsvwg-addip-sctp */ 1073 case SCTP_HAS_NAT_SUPPORT: 1074 stcb->asoc.peer_supports_nat = 0; 1075 break; 1076 case SCTP_ADD_IP_ADDRESS: 1077 case SCTP_DEL_IP_ADDRESS: 1078 case SCTP_SET_PRIM_ADDR: 1079 stcb->asoc.peer_supports_asconf = 0; 1080 break; 1081 case SCTP_SUCCESS_REPORT: 1082 case SCTP_ERROR_CAUSE_IND: 1083 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n"); 1084 SCTPDBG(SCTP_DEBUG_INPUT2, 1085 "Turning off ASCONF to this strange peer\n"); 1086 stcb->asoc.peer_supports_asconf = 0; 1087 break; 1088 default: 1089 SCTPDBG(SCTP_DEBUG_INPUT2, 1090 "Peer does not support param type %d(%x)??\n", 1091 pbad->param_type, (uint32_t) pbad->param_type); 1092 break; 1093 } 1094 } 1095 1096 static int 1097 sctp_handle_error(struct sctp_chunkhdr *ch, 1098 struct sctp_tcb *stcb, struct sctp_nets *net) 1099 { 1100 int chklen; 1101 struct sctp_paramhdr *phdr; 1102 uint16_t error_type; 1103 uint16_t error_len; 1104 struct sctp_association *asoc; 1105 int adjust; 1106 1107 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1108 struct socket *so; 1109 1110 #endif 1111 1112 /* parse through all of the errors and process */ 1113 asoc = &stcb->asoc; 1114 phdr = (struct sctp_paramhdr *)((caddr_t)ch + 1115 sizeof(struct sctp_chunkhdr)); 1116 chklen = ntohs(ch->chunk_length) - sizeof(struct sctp_chunkhdr); 1117 while ((size_t)chklen >= sizeof(struct sctp_paramhdr)) { 1118 /* Process an Error Cause */ 1119 error_type = ntohs(phdr->param_type); 1120 error_len = ntohs(phdr->param_length); 1121 if ((error_len > chklen) || (error_len == 0)) { 1122 /* invalid param length for this param */ 1123 SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in error param- chunk left:%d errorlen:%d\n", 1124 chklen, error_len); 1125 return (0); 1126 } 1127 switch (error_type) { 1128 case SCTP_CAUSE_INVALID_STREAM: 1129 case SCTP_CAUSE_MISSING_PARAM: 1130 case SCTP_CAUSE_INVALID_PARAM: 1131 case SCTP_CAUSE_NO_USER_DATA: 1132 SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %d back? We have a bug :/ (or do they?)\n", 1133 error_type); 1134 break; 1135 case SCTP_CAUSE_NAT_COLLIDING_STATE: 1136 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n", 1137 ch->chunk_flags); 1138 if (sctp_handle_nat_colliding_state(stcb)) { 1139 return (0); 1140 } 1141 break; 1142 case SCTP_CAUSE_NAT_MISSING_STATE: 1143 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n", 1144 ch->chunk_flags); 1145 if (sctp_handle_nat_missing_state(stcb, net)) { 1146 return (0); 1147 } 1148 break; 1149 case SCTP_CAUSE_STALE_COOKIE: 1150 /* 1151 * We only act if we have echoed a cookie and are 1152 * waiting. 1153 */ 1154 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) { 1155 int *p; 1156 1157 p = (int *)((caddr_t)phdr + sizeof(*phdr)); 1158 /* Save the time doubled */ 1159 asoc->cookie_preserve_req = ntohl(*p) << 1; 1160 asoc->stale_cookie_count++; 1161 if (asoc->stale_cookie_count > 1162 asoc->max_init_times) { 1163 sctp_abort_notification(stcb, 0, SCTP_SO_NOT_LOCKED); 1164 /* now free the asoc */ 1165 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1166 so = SCTP_INP_SO(stcb->sctp_ep); 1167 atomic_add_int(&stcb->asoc.refcnt, 1); 1168 SCTP_TCB_UNLOCK(stcb); 1169 SCTP_SOCKET_LOCK(so, 1); 1170 SCTP_TCB_LOCK(stcb); 1171 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1172 #endif 1173 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1174 SCTP_FROM_SCTP_INPUT + SCTP_LOC_11); 1175 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1176 SCTP_SOCKET_UNLOCK(so, 1); 1177 #endif 1178 return (-1); 1179 } 1180 /* blast back to INIT state */ 1181 sctp_toss_old_cookies(stcb, &stcb->asoc); 1182 asoc->state &= ~SCTP_STATE_COOKIE_ECHOED; 1183 asoc->state |= SCTP_STATE_COOKIE_WAIT; 1184 sctp_stop_all_cookie_timers(stcb); 1185 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 1186 } 1187 break; 1188 case SCTP_CAUSE_UNRESOLVABLE_ADDR: 1189 /* 1190 * Nothing we can do here, we don't do hostname 1191 * addresses so if the peer does not like my IPv6 1192 * (or IPv4 for that matter) it does not matter. If 1193 * they don't support that type of address, they can 1194 * NOT possibly get that packet type... i.e. with no 1195 * IPv6 you can't recieve a IPv6 packet. so we can 1196 * safely ignore this one. If we ever added support 1197 * for HOSTNAME Addresses, then we would need to do 1198 * something here. 1199 */ 1200 break; 1201 case SCTP_CAUSE_UNRECOG_CHUNK: 1202 sctp_process_unrecog_chunk(stcb, phdr, net); 1203 break; 1204 case SCTP_CAUSE_UNRECOG_PARAM: 1205 sctp_process_unrecog_param(stcb, phdr); 1206 break; 1207 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN: 1208 /* 1209 * We ignore this since the timer will drive out a 1210 * new cookie anyway and there timer will drive us 1211 * to send a SHUTDOWN_COMPLETE. We can't send one 1212 * here since we don't have their tag. 1213 */ 1214 break; 1215 case SCTP_CAUSE_DELETING_LAST_ADDR: 1216 case SCTP_CAUSE_RESOURCE_SHORTAGE: 1217 case SCTP_CAUSE_DELETING_SRC_ADDR: 1218 /* 1219 * We should NOT get these here, but in a 1220 * ASCONF-ACK. 1221 */ 1222 SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a Operational Error?<%d>?\n", 1223 error_type); 1224 break; 1225 case SCTP_CAUSE_OUT_OF_RESC: 1226 /* 1227 * And what, pray tell do we do with the fact that 1228 * the peer is out of resources? Not really sure we 1229 * could do anything but abort. I suspect this 1230 * should have came WITH an abort instead of in a 1231 * OP-ERROR. 1232 */ 1233 break; 1234 default: 1235 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown error type = 0x%xh\n", 1236 error_type); 1237 break; 1238 } 1239 adjust = SCTP_SIZE32(error_len); 1240 chklen -= adjust; 1241 phdr = (struct sctp_paramhdr *)((caddr_t)phdr + adjust); 1242 } 1243 return (0); 1244 } 1245 1246 static int 1247 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset, 1248 struct sctphdr *sh, struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 1249 struct sctp_nets *net, int *abort_no_unlock, uint32_t vrf_id) 1250 { 1251 struct sctp_init_ack *init_ack; 1252 struct mbuf *op_err; 1253 1254 SCTPDBG(SCTP_DEBUG_INPUT2, 1255 "sctp_handle_init_ack: handling INIT-ACK\n"); 1256 1257 if (stcb == NULL) { 1258 SCTPDBG(SCTP_DEBUG_INPUT2, 1259 "sctp_handle_init_ack: TCB is null\n"); 1260 return (-1); 1261 } 1262 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) { 1263 /* Invalid length */ 1264 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 1265 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 1266 op_err, 0, net->port); 1267 *abort_no_unlock = 1; 1268 return (-1); 1269 } 1270 init_ack = &cp->init; 1271 /* validate parameters */ 1272 if (init_ack->initiate_tag == 0) { 1273 /* protocol error... send an abort */ 1274 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 1275 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 1276 op_err, 0, net->port); 1277 *abort_no_unlock = 1; 1278 return (-1); 1279 } 1280 if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) { 1281 /* protocol error... send an abort */ 1282 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 1283 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 1284 op_err, 0, net->port); 1285 *abort_no_unlock = 1; 1286 return (-1); 1287 } 1288 if (init_ack->num_inbound_streams == 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 (init_ack->num_outbound_streams == 0) { 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 /* process according to association state... */ 1305 switch (stcb->asoc.state & SCTP_STATE_MASK) { 1306 case SCTP_STATE_COOKIE_WAIT: 1307 /* this is the expected state for this chunk */ 1308 /* process the INIT-ACK parameters */ 1309 if (stcb->asoc.primary_destination->dest_state & 1310 SCTP_ADDR_UNCONFIRMED) { 1311 /* 1312 * The primary is where we sent the INIT, we can 1313 * always consider it confirmed when the INIT-ACK is 1314 * returned. Do this before we load addresses 1315 * though. 1316 */ 1317 stcb->asoc.primary_destination->dest_state &= 1318 ~SCTP_ADDR_UNCONFIRMED; 1319 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 1320 stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED); 1321 } 1322 if (sctp_process_init_ack(m, iphlen, offset, sh, cp, stcb, 1323 net, abort_no_unlock, vrf_id) < 0) { 1324 /* error in parsing parameters */ 1325 return (-1); 1326 } 1327 /* update our state */ 1328 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n"); 1329 SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_ECHOED); 1330 1331 /* reset the RTO calc */ 1332 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 1333 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 1334 stcb->asoc.overall_error_count, 1335 0, 1336 SCTP_FROM_SCTP_INPUT, 1337 __LINE__); 1338 } 1339 stcb->asoc.overall_error_count = 0; 1340 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 1341 /* 1342 * collapse the init timer back in case of a exponential 1343 * backoff 1344 */ 1345 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep, 1346 stcb, net); 1347 /* 1348 * the send at the end of the inbound data processing will 1349 * cause the cookie to be sent 1350 */ 1351 break; 1352 case SCTP_STATE_SHUTDOWN_SENT: 1353 /* incorrect state... discard */ 1354 break; 1355 case SCTP_STATE_COOKIE_ECHOED: 1356 /* incorrect state... discard */ 1357 break; 1358 case SCTP_STATE_OPEN: 1359 /* incorrect state... discard */ 1360 break; 1361 case SCTP_STATE_EMPTY: 1362 case SCTP_STATE_INUSE: 1363 default: 1364 /* incorrect state... discard */ 1365 return (-1); 1366 break; 1367 } 1368 SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n"); 1369 return (0); 1370 } 1371 1372 static struct sctp_tcb * 1373 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1374 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1375 struct sctp_inpcb *inp, struct sctp_nets **netp, 1376 struct sockaddr *init_src, int *notification, 1377 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1378 uint32_t vrf_id, uint16_t port); 1379 1380 1381 /* 1382 * handle a state cookie for an existing association m: input packet mbuf 1383 * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a 1384 * "split" mbuf and the cookie signature does not exist offset: offset into 1385 * mbuf to the cookie-echo chunk 1386 */ 1387 static struct sctp_tcb * 1388 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset, 1389 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1390 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp, 1391 struct sockaddr *init_src, int *notification, sctp_assoc_t * sac_assoc_id, 1392 uint32_t vrf_id, int auth_skipped, uint32_t auth_offset, uint32_t auth_len, uint16_t port) 1393 { 1394 struct sctp_association *asoc; 1395 struct sctp_init_chunk *init_cp, init_buf; 1396 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1397 struct sctp_nets *net; 1398 struct mbuf *op_err; 1399 struct sctp_paramhdr *ph; 1400 int chk_length; 1401 int init_offset, initack_offset, i; 1402 int retval; 1403 int spec_flag = 0; 1404 uint32_t how_indx; 1405 1406 net = *netp; 1407 /* I know that the TCB is non-NULL from the caller */ 1408 asoc = &stcb->asoc; 1409 for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) { 1410 if (asoc->cookie_how[how_indx] == 0) 1411 break; 1412 } 1413 if (how_indx < sizeof(asoc->cookie_how)) { 1414 asoc->cookie_how[how_indx] = 1; 1415 } 1416 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 1417 /* SHUTDOWN came in after sending INIT-ACK */ 1418 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination); 1419 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 1420 0, M_DONTWAIT, 1, MT_DATA); 1421 if (op_err == NULL) { 1422 /* FOOBAR */ 1423 return (NULL); 1424 } 1425 /* Set the len */ 1426 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_paramhdr); 1427 ph = mtod(op_err, struct sctp_paramhdr *); 1428 ph->param_type = htons(SCTP_CAUSE_COOKIE_IN_SHUTDOWN); 1429 ph->param_length = htons(sizeof(struct sctp_paramhdr)); 1430 sctp_send_operr_to(m, iphlen, op_err, cookie->peers_vtag, 1431 vrf_id, net->port); 1432 if (how_indx < sizeof(asoc->cookie_how)) 1433 asoc->cookie_how[how_indx] = 2; 1434 return (NULL); 1435 } 1436 /* 1437 * find and validate the INIT chunk in the cookie (peer's info) the 1438 * INIT should start after the cookie-echo header struct (chunk 1439 * header, state cookie header struct) 1440 */ 1441 init_offset = offset += sizeof(struct sctp_cookie_echo_chunk); 1442 1443 init_cp = (struct sctp_init_chunk *) 1444 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 1445 (uint8_t *) & init_buf); 1446 if (init_cp == NULL) { 1447 /* could not pull a INIT chunk in cookie */ 1448 return (NULL); 1449 } 1450 chk_length = ntohs(init_cp->ch.chunk_length); 1451 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 1452 return (NULL); 1453 } 1454 /* 1455 * find and validate the INIT-ACK chunk in the cookie (my info) the 1456 * INIT-ACK follows the INIT chunk 1457 */ 1458 initack_offset = init_offset + SCTP_SIZE32(chk_length); 1459 initack_cp = (struct sctp_init_ack_chunk *) 1460 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 1461 (uint8_t *) & initack_buf); 1462 if (initack_cp == NULL) { 1463 /* could not pull INIT-ACK chunk in cookie */ 1464 return (NULL); 1465 } 1466 chk_length = ntohs(initack_cp->ch.chunk_length); 1467 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 1468 return (NULL); 1469 } 1470 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1471 (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) { 1472 /* 1473 * case D in Section 5.2.4 Table 2: MMAA process accordingly 1474 * to get into the OPEN state 1475 */ 1476 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1477 /*- 1478 * Opps, this means that we somehow generated two vtag's 1479 * the same. I.e. we did: 1480 * Us Peer 1481 * <---INIT(tag=a)------ 1482 * ----INIT-ACK(tag=t)--> 1483 * ----INIT(tag=t)------> *1 1484 * <---INIT-ACK(tag=a)--- 1485 * <----CE(tag=t)------------- *2 1486 * 1487 * At point *1 we should be generating a different 1488 * tag t'. Which means we would throw away the CE and send 1489 * ours instead. Basically this is case C (throw away side). 1490 */ 1491 if (how_indx < sizeof(asoc->cookie_how)) 1492 asoc->cookie_how[how_indx] = 17; 1493 return (NULL); 1494 1495 } 1496 switch SCTP_GET_STATE 1497 (asoc) { 1498 case SCTP_STATE_COOKIE_WAIT: 1499 case SCTP_STATE_COOKIE_ECHOED: 1500 /* 1501 * INIT was sent but got a COOKIE_ECHO with the 1502 * correct tags... just accept it...but we must 1503 * process the init so that we can make sure we have 1504 * the right seq no's. 1505 */ 1506 /* First we must process the INIT !! */ 1507 retval = sctp_process_init(init_cp, stcb, net); 1508 if (retval < 0) { 1509 if (how_indx < sizeof(asoc->cookie_how)) 1510 asoc->cookie_how[how_indx] = 3; 1511 return (NULL); 1512 } 1513 /* we have already processed the INIT so no problem */ 1514 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, 1515 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_12); 1516 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_13); 1517 /* update current state */ 1518 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) 1519 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1520 else 1521 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1522 1523 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1524 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1525 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1526 stcb->sctp_ep, stcb, asoc->primary_destination); 1527 } 1528 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1529 sctp_stop_all_cookie_timers(stcb); 1530 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1531 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1532 (inp->sctp_socket->so_qlimit == 0) 1533 ) { 1534 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1535 struct socket *so; 1536 1537 #endif 1538 /* 1539 * Here is where collision would go if we 1540 * did a connect() and instead got a 1541 * init/init-ack/cookie done before the 1542 * init-ack came back.. 1543 */ 1544 stcb->sctp_ep->sctp_flags |= 1545 SCTP_PCB_FLAGS_CONNECTED; 1546 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1547 so = SCTP_INP_SO(stcb->sctp_ep); 1548 atomic_add_int(&stcb->asoc.refcnt, 1); 1549 SCTP_TCB_UNLOCK(stcb); 1550 SCTP_SOCKET_LOCK(so, 1); 1551 SCTP_TCB_LOCK(stcb); 1552 atomic_add_int(&stcb->asoc.refcnt, -1); 1553 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1554 SCTP_SOCKET_UNLOCK(so, 1); 1555 return (NULL); 1556 } 1557 #endif 1558 soisconnected(stcb->sctp_socket); 1559 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1560 SCTP_SOCKET_UNLOCK(so, 1); 1561 #endif 1562 } 1563 /* notify upper layer */ 1564 *notification = SCTP_NOTIFY_ASSOC_UP; 1565 /* 1566 * since we did not send a HB make sure we don't 1567 * double things 1568 */ 1569 net->hb_responded = 1; 1570 net->RTO = sctp_calculate_rto(stcb, asoc, net, 1571 &cookie->time_entered, 1572 sctp_align_unsafe_makecopy, 1573 SCTP_RTT_FROM_NON_DATA); 1574 1575 if (stcb->asoc.sctp_autoclose_ticks && 1576 (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) { 1577 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 1578 inp, stcb, NULL); 1579 } 1580 break; 1581 default: 1582 /* 1583 * we're in the OPEN state (or beyond), so peer must 1584 * have simply lost the COOKIE-ACK 1585 */ 1586 break; 1587 } /* end switch */ 1588 sctp_stop_all_cookie_timers(stcb); 1589 /* 1590 * We ignore the return code here.. not sure if we should 1591 * somehow abort.. but we do have an existing asoc. This 1592 * really should not fail. 1593 */ 1594 if (sctp_load_addresses_from_init(stcb, m, iphlen, 1595 init_offset + sizeof(struct sctp_init_chunk), 1596 initack_offset, sh, init_src)) { 1597 if (how_indx < sizeof(asoc->cookie_how)) 1598 asoc->cookie_how[how_indx] = 4; 1599 return (NULL); 1600 } 1601 /* respond with a COOKIE-ACK */ 1602 sctp_toss_old_cookies(stcb, asoc); 1603 sctp_send_cookie_ack(stcb); 1604 if (how_indx < sizeof(asoc->cookie_how)) 1605 asoc->cookie_how[how_indx] = 5; 1606 return (stcb); 1607 } 1608 if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1609 ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag && 1610 cookie->tie_tag_my_vtag == 0 && 1611 cookie->tie_tag_peer_vtag == 0) { 1612 /* 1613 * case C in Section 5.2.4 Table 2: XMOO silently discard 1614 */ 1615 if (how_indx < sizeof(asoc->cookie_how)) 1616 asoc->cookie_how[how_indx] = 6; 1617 return (NULL); 1618 } 1619 /* 1620 * If nat support, and the below and stcb is established, send back 1621 * a ABORT(colliding state) if we are established. 1622 */ 1623 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) && 1624 (asoc->peer_supports_nat) && 1625 ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1626 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1627 (asoc->peer_vtag == 0)))) { 1628 /* 1629 * Special case - Peer's support nat. We may have two init's 1630 * that we gave out the same tag on since one was not 1631 * established.. i.e. we get INIT from host-1 behind the nat 1632 * and we respond tag-a, we get a INIT from host-2 behind 1633 * the nat and we get tag-a again. Then we bring up host-1 1634 * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1). 1635 * Now we have colliding state. We must send an abort here 1636 * with colliding state indication. 1637 */ 1638 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 1639 0, M_DONTWAIT, 1, MT_DATA); 1640 if (op_err == NULL) { 1641 /* FOOBAR */ 1642 return (NULL); 1643 } 1644 /* pre-reserve some space */ 1645 #ifdef INET6 1646 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr)); 1647 #else 1648 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip)); 1649 #endif 1650 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr)); 1651 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr)); 1652 /* Set the len */ 1653 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_paramhdr); 1654 ph = mtod(op_err, struct sctp_paramhdr *); 1655 ph->param_type = htons(SCTP_CAUSE_NAT_COLLIDING_STATE); 1656 ph->param_length = htons(sizeof(struct sctp_paramhdr)); 1657 sctp_send_abort(m, iphlen, sh, 0, op_err, vrf_id, port); 1658 return (NULL); 1659 } 1660 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1661 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1662 (asoc->peer_vtag == 0))) { 1663 /* 1664 * case B in Section 5.2.4 Table 2: MXAA or MOAA my info 1665 * should be ok, re-accept peer info 1666 */ 1667 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1668 /* 1669 * Extension of case C. If we hit this, then the 1670 * random number generator returned the same vtag 1671 * when we first sent our INIT-ACK and when we later 1672 * sent our INIT. The side with the seq numbers that 1673 * are different will be the one that normnally 1674 * would have hit case C. This in effect "extends" 1675 * our vtags in this collision case to be 64 bits. 1676 * The same collision could occur aka you get both 1677 * vtag and seq number the same twice in a row.. but 1678 * is much less likely. If it did happen then we 1679 * would proceed through and bring up the assoc.. we 1680 * may end up with the wrong stream setup however.. 1681 * which would be bad.. but there is no way to 1682 * tell.. until we send on a stream that does not 1683 * exist :-) 1684 */ 1685 if (how_indx < sizeof(asoc->cookie_how)) 1686 asoc->cookie_how[how_indx] = 7; 1687 1688 return (NULL); 1689 } 1690 if (how_indx < sizeof(asoc->cookie_how)) 1691 asoc->cookie_how[how_indx] = 8; 1692 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_14); 1693 sctp_stop_all_cookie_timers(stcb); 1694 /* 1695 * since we did not send a HB make sure we don't double 1696 * things 1697 */ 1698 net->hb_responded = 1; 1699 if (stcb->asoc.sctp_autoclose_ticks && 1700 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 1701 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, 1702 NULL); 1703 } 1704 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1705 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 1706 1707 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) { 1708 /* 1709 * Ok the peer probably discarded our data (if we 1710 * echoed a cookie+data). So anything on the 1711 * sent_queue should be marked for retransmit, we 1712 * may not get something to kick us so it COULD 1713 * still take a timeout to move these.. but it can't 1714 * hurt to mark them. 1715 */ 1716 struct sctp_tmit_chunk *chk; 1717 1718 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 1719 if (chk->sent < SCTP_DATAGRAM_RESEND) { 1720 chk->sent = SCTP_DATAGRAM_RESEND; 1721 sctp_flight_size_decrease(chk); 1722 sctp_total_flight_decrease(stcb, chk); 1723 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 1724 spec_flag++; 1725 } 1726 } 1727 1728 } 1729 /* process the INIT info (peer's info) */ 1730 retval = sctp_process_init(init_cp, stcb, net); 1731 if (retval < 0) { 1732 if (how_indx < sizeof(asoc->cookie_how)) 1733 asoc->cookie_how[how_indx] = 9; 1734 return (NULL); 1735 } 1736 if (sctp_load_addresses_from_init(stcb, m, iphlen, 1737 init_offset + sizeof(struct sctp_init_chunk), 1738 initack_offset, sh, init_src)) { 1739 if (how_indx < sizeof(asoc->cookie_how)) 1740 asoc->cookie_how[how_indx] = 10; 1741 return (NULL); 1742 } 1743 if ((asoc->state & SCTP_STATE_COOKIE_WAIT) || 1744 (asoc->state & SCTP_STATE_COOKIE_ECHOED)) { 1745 *notification = SCTP_NOTIFY_ASSOC_UP; 1746 1747 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1748 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1749 (inp->sctp_socket->so_qlimit == 0)) { 1750 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1751 struct socket *so; 1752 1753 #endif 1754 stcb->sctp_ep->sctp_flags |= 1755 SCTP_PCB_FLAGS_CONNECTED; 1756 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1757 so = SCTP_INP_SO(stcb->sctp_ep); 1758 atomic_add_int(&stcb->asoc.refcnt, 1); 1759 SCTP_TCB_UNLOCK(stcb); 1760 SCTP_SOCKET_LOCK(so, 1); 1761 SCTP_TCB_LOCK(stcb); 1762 atomic_add_int(&stcb->asoc.refcnt, -1); 1763 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1764 SCTP_SOCKET_UNLOCK(so, 1); 1765 return (NULL); 1766 } 1767 #endif 1768 soisconnected(stcb->sctp_socket); 1769 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1770 SCTP_SOCKET_UNLOCK(so, 1); 1771 #endif 1772 } 1773 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) 1774 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1775 else 1776 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1777 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1778 } else if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) { 1779 SCTP_STAT_INCR_COUNTER32(sctps_restartestab); 1780 } else { 1781 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1782 } 1783 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1784 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1785 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1786 stcb->sctp_ep, stcb, asoc->primary_destination); 1787 } 1788 sctp_stop_all_cookie_timers(stcb); 1789 sctp_toss_old_cookies(stcb, asoc); 1790 sctp_send_cookie_ack(stcb); 1791 if (spec_flag) { 1792 /* 1793 * only if we have retrans set do we do this. What 1794 * this call does is get only the COOKIE-ACK out and 1795 * then when we return the normal call to 1796 * sctp_chunk_output will get the retrans out behind 1797 * this. 1798 */ 1799 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED); 1800 } 1801 if (how_indx < sizeof(asoc->cookie_how)) 1802 asoc->cookie_how[how_indx] = 11; 1803 1804 return (stcb); 1805 } 1806 if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1807 ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) && 1808 cookie->tie_tag_my_vtag == asoc->my_vtag_nonce && 1809 cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce && 1810 cookie->tie_tag_peer_vtag != 0) { 1811 struct sctpasochead *head; 1812 1813 if (asoc->peer_supports_nat) { 1814 /* 1815 * This is a gross gross hack. just call the 1816 * cookie_new code since we are allowing a duplicate 1817 * association. I hope this works... 1818 */ 1819 return (sctp_process_cookie_new(m, iphlen, offset, sh, cookie, cookie_len, 1820 inp, netp, init_src, notification, 1821 auth_skipped, auth_offset, auth_len, 1822 vrf_id, port)); 1823 } 1824 /* 1825 * case A in Section 5.2.4 Table 2: XXMM (peer restarted) 1826 */ 1827 /* temp code */ 1828 if (how_indx < sizeof(asoc->cookie_how)) 1829 asoc->cookie_how[how_indx] = 12; 1830 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_15); 1831 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 1832 1833 *sac_assoc_id = sctp_get_associd(stcb); 1834 /* notify upper layer */ 1835 *notification = SCTP_NOTIFY_ASSOC_RESTART; 1836 atomic_add_int(&stcb->asoc.refcnt, 1); 1837 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_OPEN) && 1838 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) && 1839 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) { 1840 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1841 } 1842 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) { 1843 SCTP_STAT_INCR_GAUGE32(sctps_restartestab); 1844 } else if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) { 1845 SCTP_STAT_INCR_GAUGE32(sctps_collisionestab); 1846 } 1847 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1848 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1849 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1850 stcb->sctp_ep, stcb, asoc->primary_destination); 1851 1852 } else if (!(asoc->state & SCTP_STATE_SHUTDOWN_SENT)) { 1853 /* move to OPEN state, if not in SHUTDOWN_SENT */ 1854 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1855 } 1856 asoc->pre_open_streams = 1857 ntohs(initack_cp->init.num_outbound_streams); 1858 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 1859 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 1860 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 1861 1862 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 1863 1864 asoc->str_reset_seq_in = asoc->init_seq_number; 1865 1866 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 1867 if (asoc->mapping_array) { 1868 memset(asoc->mapping_array, 0, 1869 asoc->mapping_array_size); 1870 } 1871 if (asoc->nr_mapping_array) { 1872 memset(asoc->nr_mapping_array, 0, 1873 asoc->mapping_array_size); 1874 } 1875 SCTP_TCB_UNLOCK(stcb); 1876 SCTP_INP_INFO_WLOCK(); 1877 SCTP_INP_WLOCK(stcb->sctp_ep); 1878 SCTP_TCB_LOCK(stcb); 1879 atomic_add_int(&stcb->asoc.refcnt, -1); 1880 /* send up all the data */ 1881 SCTP_TCB_SEND_LOCK(stcb); 1882 1883 sctp_report_all_outbound(stcb, 1, SCTP_SO_NOT_LOCKED); 1884 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 1885 stcb->asoc.strmout[i].stream_no = i; 1886 stcb->asoc.strmout[i].next_sequence_sent = 0; 1887 stcb->asoc.strmout[i].last_msg_incomplete = 0; 1888 } 1889 /* process the INIT-ACK info (my info) */ 1890 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 1891 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1892 1893 /* pull from vtag hash */ 1894 LIST_REMOVE(stcb, sctp_asocs); 1895 /* re-insert to new vtag position */ 1896 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, 1897 SCTP_BASE_INFO(hashasocmark))]; 1898 /* 1899 * put it in the bucket in the vtag hash of assoc's for the 1900 * system 1901 */ 1902 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 1903 1904 /* process the INIT info (peer's info) */ 1905 SCTP_TCB_SEND_UNLOCK(stcb); 1906 SCTP_INP_WUNLOCK(stcb->sctp_ep); 1907 SCTP_INP_INFO_WUNLOCK(); 1908 1909 retval = sctp_process_init(init_cp, stcb, net); 1910 if (retval < 0) { 1911 if (how_indx < sizeof(asoc->cookie_how)) 1912 asoc->cookie_how[how_indx] = 13; 1913 1914 return (NULL); 1915 } 1916 /* 1917 * since we did not send a HB make sure we don't double 1918 * things 1919 */ 1920 net->hb_responded = 1; 1921 1922 if (sctp_load_addresses_from_init(stcb, m, iphlen, 1923 init_offset + sizeof(struct sctp_init_chunk), 1924 initack_offset, sh, init_src)) { 1925 if (how_indx < sizeof(asoc->cookie_how)) 1926 asoc->cookie_how[how_indx] = 14; 1927 1928 return (NULL); 1929 } 1930 /* respond with a COOKIE-ACK */ 1931 sctp_stop_all_cookie_timers(stcb); 1932 sctp_toss_old_cookies(stcb, asoc); 1933 sctp_send_cookie_ack(stcb); 1934 if (how_indx < sizeof(asoc->cookie_how)) 1935 asoc->cookie_how[how_indx] = 15; 1936 1937 return (stcb); 1938 } 1939 if (how_indx < sizeof(asoc->cookie_how)) 1940 asoc->cookie_how[how_indx] = 16; 1941 /* all other cases... */ 1942 return (NULL); 1943 } 1944 1945 1946 /* 1947 * handle a state cookie for a new association m: input packet mbuf chain-- 1948 * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf 1949 * and the cookie signature does not exist offset: offset into mbuf to the 1950 * cookie-echo chunk length: length of the cookie chunk to: where the init 1951 * was from returns a new TCB 1952 */ 1953 struct sctp_tcb * 1954 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1955 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1956 struct sctp_inpcb *inp, struct sctp_nets **netp, 1957 struct sockaddr *init_src, int *notification, 1958 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1959 uint32_t vrf_id, uint16_t port) 1960 { 1961 struct sctp_tcb *stcb; 1962 struct sctp_init_chunk *init_cp, init_buf; 1963 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1964 struct sockaddr_storage sa_store; 1965 struct sockaddr *initack_src = (struct sockaddr *)&sa_store; 1966 struct sctp_association *asoc; 1967 int chk_length; 1968 int init_offset, initack_offset, initack_limit; 1969 int retval; 1970 int error = 0; 1971 uint32_t old_tag; 1972 uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE]; 1973 1974 #ifdef INET 1975 struct sockaddr_in *sin; 1976 1977 #endif 1978 #ifdef INET6 1979 struct sockaddr_in6 *sin6; 1980 1981 #endif 1982 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1983 struct socket *so; 1984 1985 so = SCTP_INP_SO(inp); 1986 #endif 1987 1988 /* 1989 * find and validate the INIT chunk in the cookie (peer's info) the 1990 * INIT should start after the cookie-echo header struct (chunk 1991 * header, state cookie header struct) 1992 */ 1993 init_offset = offset + sizeof(struct sctp_cookie_echo_chunk); 1994 init_cp = (struct sctp_init_chunk *) 1995 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 1996 (uint8_t *) & init_buf); 1997 if (init_cp == NULL) { 1998 /* could not pull a INIT chunk in cookie */ 1999 SCTPDBG(SCTP_DEBUG_INPUT1, 2000 "process_cookie_new: could not pull INIT chunk hdr\n"); 2001 return (NULL); 2002 } 2003 chk_length = ntohs(init_cp->ch.chunk_length); 2004 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 2005 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n"); 2006 return (NULL); 2007 } 2008 initack_offset = init_offset + SCTP_SIZE32(chk_length); 2009 /* 2010 * find and validate the INIT-ACK chunk in the cookie (my info) the 2011 * INIT-ACK follows the INIT chunk 2012 */ 2013 initack_cp = (struct sctp_init_ack_chunk *) 2014 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 2015 (uint8_t *) & initack_buf); 2016 if (initack_cp == NULL) { 2017 /* could not pull INIT-ACK chunk in cookie */ 2018 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n"); 2019 return (NULL); 2020 } 2021 chk_length = ntohs(initack_cp->ch.chunk_length); 2022 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 2023 return (NULL); 2024 } 2025 /* 2026 * NOTE: We can't use the INIT_ACK's chk_length to determine the 2027 * "initack_limit" value. This is because the chk_length field 2028 * includes the length of the cookie, but the cookie is omitted when 2029 * the INIT and INIT_ACK are tacked onto the cookie... 2030 */ 2031 initack_limit = offset + cookie_len; 2032 2033 /* 2034 * now that we know the INIT/INIT-ACK are in place, create a new TCB 2035 * and popluate 2036 */ 2037 2038 /* 2039 * Here we do a trick, we set in NULL for the proc/thread argument. 2040 * We do this since in effect we only use the p argument when the 2041 * socket is unbound and we must do an implicit bind. Since we are 2042 * getting a cookie, we cannot be unbound. 2043 */ 2044 stcb = sctp_aloc_assoc(inp, init_src, &error, 2045 ntohl(initack_cp->init.initiate_tag), vrf_id, 2046 (struct thread *)NULL 2047 ); 2048 if (stcb == NULL) { 2049 struct mbuf *op_err; 2050 2051 /* memory problem? */ 2052 SCTPDBG(SCTP_DEBUG_INPUT1, 2053 "process_cookie_new: no room for another TCB!\n"); 2054 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC); 2055 2056 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2057 sh, op_err, vrf_id, port); 2058 return (NULL); 2059 } 2060 /* get the correct sctp_nets */ 2061 if (netp) 2062 *netp = sctp_findnet(stcb, init_src); 2063 2064 asoc = &stcb->asoc; 2065 /* get scope variables out of cookie */ 2066 asoc->ipv4_local_scope = cookie->ipv4_scope; 2067 asoc->site_scope = cookie->site_scope; 2068 asoc->local_scope = cookie->local_scope; 2069 asoc->loopback_scope = cookie->loopback_scope; 2070 2071 if ((asoc->ipv4_addr_legal != cookie->ipv4_addr_legal) || 2072 (asoc->ipv6_addr_legal != cookie->ipv6_addr_legal)) { 2073 struct mbuf *op_err; 2074 2075 /* 2076 * Houston we have a problem. The EP changed while the 2077 * cookie was in flight. Only recourse is to abort the 2078 * association. 2079 */ 2080 atomic_add_int(&stcb->asoc.refcnt, 1); 2081 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC); 2082 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2083 sh, op_err, vrf_id, port); 2084 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2085 SCTP_TCB_UNLOCK(stcb); 2086 SCTP_SOCKET_LOCK(so, 1); 2087 SCTP_TCB_LOCK(stcb); 2088 #endif 2089 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2090 SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 2091 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2092 SCTP_SOCKET_UNLOCK(so, 1); 2093 #endif 2094 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2095 return (NULL); 2096 } 2097 /* process the INIT-ACK info (my info) */ 2098 old_tag = asoc->my_vtag; 2099 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 2100 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 2101 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 2102 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 2103 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 2104 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 2105 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 2106 asoc->str_reset_seq_in = asoc->init_seq_number; 2107 2108 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 2109 2110 /* process the INIT info (peer's info) */ 2111 if (netp) 2112 retval = sctp_process_init(init_cp, stcb, *netp); 2113 else 2114 retval = 0; 2115 if (retval < 0) { 2116 atomic_add_int(&stcb->asoc.refcnt, 1); 2117 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2118 SCTP_TCB_UNLOCK(stcb); 2119 SCTP_SOCKET_LOCK(so, 1); 2120 SCTP_TCB_LOCK(stcb); 2121 #endif 2122 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 2123 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2124 SCTP_SOCKET_UNLOCK(so, 1); 2125 #endif 2126 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2127 return (NULL); 2128 } 2129 /* load all addresses */ 2130 if (sctp_load_addresses_from_init(stcb, m, iphlen, 2131 init_offset + sizeof(struct sctp_init_chunk), initack_offset, sh, 2132 init_src)) { 2133 atomic_add_int(&stcb->asoc.refcnt, 1); 2134 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2135 SCTP_TCB_UNLOCK(stcb); 2136 SCTP_SOCKET_LOCK(so, 1); 2137 SCTP_TCB_LOCK(stcb); 2138 #endif 2139 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_17); 2140 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2141 SCTP_SOCKET_UNLOCK(so, 1); 2142 #endif 2143 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2144 return (NULL); 2145 } 2146 /* 2147 * verify any preceding AUTH chunk that was skipped 2148 */ 2149 /* pull the local authentication parameters from the cookie/init-ack */ 2150 sctp_auth_get_cookie_params(stcb, m, 2151 initack_offset + sizeof(struct sctp_init_ack_chunk), 2152 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk))); 2153 if (auth_skipped) { 2154 struct sctp_auth_chunk *auth; 2155 2156 auth = (struct sctp_auth_chunk *) 2157 sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf); 2158 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) { 2159 /* auth HMAC failed, dump the assoc and packet */ 2160 SCTPDBG(SCTP_DEBUG_AUTH1, 2161 "COOKIE-ECHO: AUTH failed\n"); 2162 atomic_add_int(&stcb->asoc.refcnt, 1); 2163 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2164 SCTP_TCB_UNLOCK(stcb); 2165 SCTP_SOCKET_LOCK(so, 1); 2166 SCTP_TCB_LOCK(stcb); 2167 #endif 2168 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_18); 2169 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2170 SCTP_SOCKET_UNLOCK(so, 1); 2171 #endif 2172 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2173 return (NULL); 2174 } else { 2175 /* remaining chunks checked... good to go */ 2176 stcb->asoc.authenticated = 1; 2177 } 2178 } 2179 /* update current state */ 2180 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2181 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 2182 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2183 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2184 stcb->sctp_ep, stcb, asoc->primary_destination); 2185 } 2186 sctp_stop_all_cookie_timers(stcb); 2187 SCTP_STAT_INCR_COUNTER32(sctps_passiveestab); 2188 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2189 2190 /* 2191 * if we're doing ASCONFs, check to see if we have any new local 2192 * addresses that need to get added to the peer (eg. addresses 2193 * changed while cookie echo in flight). This needs to be done 2194 * after we go to the OPEN state to do the correct asconf 2195 * processing. else, make sure we have the correct addresses in our 2196 * lists 2197 */ 2198 2199 /* warning, we re-use sin, sin6, sa_store here! */ 2200 /* pull in local_address (our "from" address) */ 2201 switch (cookie->laddr_type) { 2202 #ifdef INET 2203 case SCTP_IPV4_ADDRESS: 2204 /* source addr is IPv4 */ 2205 sin = (struct sockaddr_in *)initack_src; 2206 memset(sin, 0, sizeof(*sin)); 2207 sin->sin_family = AF_INET; 2208 sin->sin_len = sizeof(struct sockaddr_in); 2209 sin->sin_addr.s_addr = cookie->laddress[0]; 2210 break; 2211 #endif 2212 #ifdef INET6 2213 case SCTP_IPV6_ADDRESS: 2214 /* source addr is IPv6 */ 2215 sin6 = (struct sockaddr_in6 *)initack_src; 2216 memset(sin6, 0, sizeof(*sin6)); 2217 sin6->sin6_family = AF_INET6; 2218 sin6->sin6_len = sizeof(struct sockaddr_in6); 2219 sin6->sin6_scope_id = cookie->scope_id; 2220 memcpy(&sin6->sin6_addr, cookie->laddress, 2221 sizeof(sin6->sin6_addr)); 2222 break; 2223 #endif 2224 default: 2225 atomic_add_int(&stcb->asoc.refcnt, 1); 2226 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2227 SCTP_TCB_UNLOCK(stcb); 2228 SCTP_SOCKET_LOCK(so, 1); 2229 SCTP_TCB_LOCK(stcb); 2230 #endif 2231 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_19); 2232 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2233 SCTP_SOCKET_UNLOCK(so, 1); 2234 #endif 2235 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2236 return (NULL); 2237 } 2238 2239 /* set up to notify upper layer */ 2240 *notification = SCTP_NOTIFY_ASSOC_UP; 2241 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2242 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 2243 (inp->sctp_socket->so_qlimit == 0)) { 2244 /* 2245 * This is an endpoint that called connect() how it got a 2246 * cookie that is NEW is a bit of a mystery. It must be that 2247 * the INIT was sent, but before it got there.. a complete 2248 * INIT/INIT-ACK/COOKIE arrived. But of course then it 2249 * should have went to the other code.. not here.. oh well.. 2250 * a bit of protection is worth having.. 2251 */ 2252 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2253 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2254 atomic_add_int(&stcb->asoc.refcnt, 1); 2255 SCTP_TCB_UNLOCK(stcb); 2256 SCTP_SOCKET_LOCK(so, 1); 2257 SCTP_TCB_LOCK(stcb); 2258 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2259 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2260 SCTP_SOCKET_UNLOCK(so, 1); 2261 return (NULL); 2262 } 2263 #endif 2264 soisconnected(stcb->sctp_socket); 2265 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2266 SCTP_SOCKET_UNLOCK(so, 1); 2267 #endif 2268 } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 2269 (inp->sctp_socket->so_qlimit)) { 2270 /* 2271 * We don't want to do anything with this one. Since it is 2272 * the listening guy. The timer will get started for 2273 * accepted connections in the caller. 2274 */ 2275 ; 2276 } 2277 /* since we did not send a HB make sure we don't double things */ 2278 if ((netp) && (*netp)) 2279 (*netp)->hb_responded = 1; 2280 2281 if (stcb->asoc.sctp_autoclose_ticks && 2282 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2283 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL); 2284 } 2285 /* calculate the RTT */ 2286 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 2287 if ((netp) && (*netp)) { 2288 (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp, 2289 &cookie->time_entered, sctp_align_unsafe_makecopy, 2290 SCTP_RTT_FROM_NON_DATA); 2291 } 2292 /* respond with a COOKIE-ACK */ 2293 sctp_send_cookie_ack(stcb); 2294 2295 /* 2296 * check the address lists for any ASCONFs that need to be sent 2297 * AFTER the cookie-ack is sent 2298 */ 2299 sctp_check_address_list(stcb, m, 2300 initack_offset + sizeof(struct sctp_init_ack_chunk), 2301 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)), 2302 initack_src, cookie->local_scope, cookie->site_scope, 2303 cookie->ipv4_scope, cookie->loopback_scope); 2304 2305 2306 return (stcb); 2307 } 2308 2309 /* 2310 * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e 2311 * we NEED to make sure we are not already using the vtag. If so we 2312 * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit! 2313 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag, 2314 SCTP_BASE_INFO(hashasocmark))]; 2315 LIST_FOREACH(stcb, head, sctp_asocs) { 2316 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep)) { 2317 -- SEND ABORT - TRY AGAIN -- 2318 } 2319 } 2320 */ 2321 2322 /* 2323 * handles a COOKIE-ECHO message stcb: modified to either a new or left as 2324 * existing (non-NULL) TCB 2325 */ 2326 static struct mbuf * 2327 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset, 2328 struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp, 2329 struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp, 2330 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2331 struct sctp_tcb **locked_tcb, uint32_t vrf_id, uint16_t port) 2332 { 2333 struct sctp_state_cookie *cookie; 2334 struct sctp_tcb *l_stcb = *stcb; 2335 struct sctp_inpcb *l_inp; 2336 struct sockaddr *to; 2337 sctp_assoc_t sac_restart_id; 2338 struct sctp_pcb *ep; 2339 struct mbuf *m_sig; 2340 uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE]; 2341 uint8_t *sig; 2342 uint8_t cookie_ok = 0; 2343 unsigned int size_of_pkt, sig_offset, cookie_offset; 2344 unsigned int cookie_len; 2345 struct timeval now; 2346 struct timeval time_expires; 2347 struct sockaddr_storage dest_store; 2348 struct sockaddr *localep_sa = (struct sockaddr *)&dest_store; 2349 struct ip *iph; 2350 int notification = 0; 2351 struct sctp_nets *netl; 2352 int had_a_existing_tcb = 0; 2353 int send_int_conf = 0; 2354 2355 #ifdef INET 2356 struct sockaddr_in sin; 2357 2358 #endif 2359 #ifdef INET6 2360 struct sockaddr_in6 sin6; 2361 2362 #endif 2363 2364 SCTPDBG(SCTP_DEBUG_INPUT2, 2365 "sctp_handle_cookie: handling COOKIE-ECHO\n"); 2366 2367 if (inp_p == NULL) { 2368 return (NULL); 2369 } 2370 /* First get the destination address setup too. */ 2371 iph = mtod(m, struct ip *); 2372 switch (iph->ip_v) { 2373 #ifdef INET 2374 case IPVERSION: 2375 { 2376 /* its IPv4 */ 2377 struct sockaddr_in *lsin; 2378 2379 lsin = (struct sockaddr_in *)(localep_sa); 2380 memset(lsin, 0, sizeof(*lsin)); 2381 lsin->sin_family = AF_INET; 2382 lsin->sin_len = sizeof(*lsin); 2383 lsin->sin_port = sh->dest_port; 2384 lsin->sin_addr.s_addr = iph->ip_dst.s_addr; 2385 size_of_pkt = SCTP_GET_IPV4_LENGTH(iph); 2386 break; 2387 } 2388 #endif 2389 #ifdef INET6 2390 case IPV6_VERSION >> 4: 2391 { 2392 /* its IPv6 */ 2393 struct ip6_hdr *ip6; 2394 struct sockaddr_in6 *lsin6; 2395 2396 lsin6 = (struct sockaddr_in6 *)(localep_sa); 2397 memset(lsin6, 0, sizeof(*lsin6)); 2398 lsin6->sin6_family = AF_INET6; 2399 lsin6->sin6_len = sizeof(struct sockaddr_in6); 2400 ip6 = mtod(m, struct ip6_hdr *); 2401 lsin6->sin6_port = sh->dest_port; 2402 lsin6->sin6_addr = ip6->ip6_dst; 2403 size_of_pkt = SCTP_GET_IPV6_LENGTH(ip6) + iphlen; 2404 break; 2405 } 2406 #endif 2407 default: 2408 return (NULL); 2409 } 2410 2411 cookie = &cp->cookie; 2412 cookie_offset = offset + sizeof(struct sctp_chunkhdr); 2413 cookie_len = ntohs(cp->ch.chunk_length); 2414 2415 if ((cookie->peerport != sh->src_port) && 2416 (cookie->myport != sh->dest_port) && 2417 (cookie->my_vtag != sh->v_tag)) { 2418 /* 2419 * invalid ports or bad tag. Note that we always leave the 2420 * v_tag in the header in network order and when we stored 2421 * it in the my_vtag slot we also left it in network order. 2422 * This maintains the match even though it may be in the 2423 * opposite byte order of the machine :-> 2424 */ 2425 return (NULL); 2426 } 2427 if (cookie_len > size_of_pkt || 2428 cookie_len < sizeof(struct sctp_cookie_echo_chunk) + 2429 sizeof(struct sctp_init_chunk) + 2430 sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) { 2431 /* cookie too long! or too small */ 2432 return (NULL); 2433 } 2434 /* 2435 * split off the signature into its own mbuf (since it should not be 2436 * calculated in the sctp_hmac_m() call). 2437 */ 2438 sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE; 2439 if (sig_offset > size_of_pkt) { 2440 /* packet not correct size! */ 2441 /* XXX this may already be accounted for earlier... */ 2442 return (NULL); 2443 } 2444 m_sig = m_split(m, sig_offset, M_DONTWAIT); 2445 if (m_sig == NULL) { 2446 /* out of memory or ?? */ 2447 return (NULL); 2448 } 2449 #ifdef SCTP_MBUF_LOGGING 2450 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 2451 struct mbuf *mat; 2452 2453 mat = m_sig; 2454 while (mat) { 2455 if (SCTP_BUF_IS_EXTENDED(mat)) { 2456 sctp_log_mb(mat, SCTP_MBUF_SPLIT); 2457 } 2458 mat = SCTP_BUF_NEXT(mat); 2459 } 2460 } 2461 #endif 2462 2463 /* 2464 * compute the signature/digest for the cookie 2465 */ 2466 ep = &(*inp_p)->sctp_ep; 2467 l_inp = *inp_p; 2468 if (l_stcb) { 2469 SCTP_TCB_UNLOCK(l_stcb); 2470 } 2471 SCTP_INP_RLOCK(l_inp); 2472 if (l_stcb) { 2473 SCTP_TCB_LOCK(l_stcb); 2474 } 2475 /* which cookie is it? */ 2476 if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) && 2477 (ep->current_secret_number != ep->last_secret_number)) { 2478 /* it's the old cookie */ 2479 (void)sctp_hmac_m(SCTP_HMAC, 2480 (uint8_t *) ep->secret_key[(int)ep->last_secret_number], 2481 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2482 } else { 2483 /* it's the current cookie */ 2484 (void)sctp_hmac_m(SCTP_HMAC, 2485 (uint8_t *) ep->secret_key[(int)ep->current_secret_number], 2486 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2487 } 2488 /* get the signature */ 2489 SCTP_INP_RUNLOCK(l_inp); 2490 sig = (uint8_t *) sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *) & tmp_sig); 2491 if (sig == NULL) { 2492 /* couldn't find signature */ 2493 sctp_m_freem(m_sig); 2494 return (NULL); 2495 } 2496 /* compare the received digest with the computed digest */ 2497 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) { 2498 /* try the old cookie? */ 2499 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) && 2500 (ep->current_secret_number != ep->last_secret_number)) { 2501 /* compute digest with old */ 2502 (void)sctp_hmac_m(SCTP_HMAC, 2503 (uint8_t *) ep->secret_key[(int)ep->last_secret_number], 2504 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2505 /* compare */ 2506 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0) 2507 cookie_ok = 1; 2508 } 2509 } else { 2510 cookie_ok = 1; 2511 } 2512 2513 /* 2514 * Now before we continue we must reconstruct our mbuf so that 2515 * normal processing of any other chunks will work. 2516 */ 2517 { 2518 struct mbuf *m_at; 2519 2520 m_at = m; 2521 while (SCTP_BUF_NEXT(m_at) != NULL) { 2522 m_at = SCTP_BUF_NEXT(m_at); 2523 } 2524 SCTP_BUF_NEXT(m_at) = m_sig; 2525 } 2526 2527 if (cookie_ok == 0) { 2528 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n"); 2529 SCTPDBG(SCTP_DEBUG_INPUT2, 2530 "offset = %u, cookie_offset = %u, sig_offset = %u\n", 2531 (uint32_t) offset, cookie_offset, sig_offset); 2532 return (NULL); 2533 } 2534 /* 2535 * check the cookie timestamps to be sure it's not stale 2536 */ 2537 (void)SCTP_GETTIME_TIMEVAL(&now); 2538 /* Expire time is in Ticks, so we convert to seconds */ 2539 time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life); 2540 time_expires.tv_usec = cookie->time_entered.tv_usec; 2541 /* 2542 * TODO sctp_constants.h needs alternative time macros when _KERNEL 2543 * is undefined. 2544 */ 2545 if (timevalcmp(&now, &time_expires, >)) { 2546 /* cookie is stale! */ 2547 struct mbuf *op_err; 2548 struct sctp_stale_cookie_msg *scm; 2549 uint32_t tim; 2550 2551 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_stale_cookie_msg), 2552 0, M_DONTWAIT, 1, MT_DATA); 2553 if (op_err == NULL) { 2554 /* FOOBAR */ 2555 return (NULL); 2556 } 2557 /* Set the len */ 2558 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_stale_cookie_msg); 2559 scm = mtod(op_err, struct sctp_stale_cookie_msg *); 2560 scm->ph.param_type = htons(SCTP_CAUSE_STALE_COOKIE); 2561 scm->ph.param_length = htons((sizeof(struct sctp_paramhdr) + 2562 (sizeof(uint32_t)))); 2563 /* seconds to usec */ 2564 tim = (now.tv_sec - time_expires.tv_sec) * 1000000; 2565 /* add in usec */ 2566 if (tim == 0) 2567 tim = now.tv_usec - cookie->time_entered.tv_usec; 2568 scm->time_usec = htonl(tim); 2569 sctp_send_operr_to(m, iphlen, op_err, cookie->peers_vtag, 2570 vrf_id, port); 2571 return (NULL); 2572 } 2573 /* 2574 * Now we must see with the lookup address if we have an existing 2575 * asoc. This will only happen if we were in the COOKIE-WAIT state 2576 * and a INIT collided with us and somewhere the peer sent the 2577 * cookie on another address besides the single address our assoc 2578 * had for him. In this case we will have one of the tie-tags set at 2579 * least AND the address field in the cookie can be used to look it 2580 * up. 2581 */ 2582 to = NULL; 2583 switch (cookie->addr_type) { 2584 #ifdef INET6 2585 case SCTP_IPV6_ADDRESS: 2586 memset(&sin6, 0, sizeof(sin6)); 2587 sin6.sin6_family = AF_INET6; 2588 sin6.sin6_len = sizeof(sin6); 2589 sin6.sin6_port = sh->src_port; 2590 sin6.sin6_scope_id = cookie->scope_id; 2591 memcpy(&sin6.sin6_addr.s6_addr, cookie->address, 2592 sizeof(sin6.sin6_addr.s6_addr)); 2593 to = (struct sockaddr *)&sin6; 2594 break; 2595 #endif 2596 #ifdef INET 2597 case SCTP_IPV4_ADDRESS: 2598 memset(&sin, 0, sizeof(sin)); 2599 sin.sin_family = AF_INET; 2600 sin.sin_len = sizeof(sin); 2601 sin.sin_port = sh->src_port; 2602 sin.sin_addr.s_addr = cookie->address[0]; 2603 to = (struct sockaddr *)&sin; 2604 break; 2605 #endif 2606 default: 2607 /* This should not happen */ 2608 return (NULL); 2609 } 2610 if ((*stcb == NULL) && to) { 2611 /* Yep, lets check */ 2612 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, localep_sa, NULL); 2613 if (*stcb == NULL) { 2614 /* 2615 * We should have only got back the same inp. If we 2616 * got back a different ep we have a problem. The 2617 * original findep got back l_inp and now 2618 */ 2619 if (l_inp != *inp_p) { 2620 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n"); 2621 } 2622 } else { 2623 if (*locked_tcb == NULL) { 2624 /* 2625 * In this case we found the assoc only 2626 * after we locked the create lock. This 2627 * means we are in a colliding case and we 2628 * must make sure that we unlock the tcb if 2629 * its one of the cases where we throw away 2630 * the incoming packets. 2631 */ 2632 *locked_tcb = *stcb; 2633 2634 /* 2635 * We must also increment the inp ref count 2636 * since the ref_count flags was set when we 2637 * did not find the TCB, now we found it 2638 * which reduces the refcount.. we must 2639 * raise it back out to balance it all :-) 2640 */ 2641 SCTP_INP_INCR_REF((*stcb)->sctp_ep); 2642 if ((*stcb)->sctp_ep != l_inp) { 2643 SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n", 2644 (*stcb)->sctp_ep, l_inp); 2645 } 2646 } 2647 } 2648 } 2649 if (to == NULL) { 2650 return (NULL); 2651 } 2652 cookie_len -= SCTP_SIGNATURE_SIZE; 2653 if (*stcb == NULL) { 2654 /* this is the "normal" case... get a new TCB */ 2655 *stcb = sctp_process_cookie_new(m, iphlen, offset, sh, cookie, 2656 cookie_len, *inp_p, netp, to, ¬ification, 2657 auth_skipped, auth_offset, auth_len, vrf_id, port); 2658 } else { 2659 /* this is abnormal... cookie-echo on existing TCB */ 2660 had_a_existing_tcb = 1; 2661 *stcb = sctp_process_cookie_existing(m, iphlen, offset, sh, 2662 cookie, cookie_len, *inp_p, *stcb, netp, to, 2663 ¬ification, &sac_restart_id, vrf_id, auth_skipped, auth_offset, auth_len, port); 2664 } 2665 2666 if (*stcb == NULL) { 2667 /* still no TCB... must be bad cookie-echo */ 2668 return (NULL); 2669 } 2670 if ((*netp != NULL) && (m->m_flags & M_FLOWID)) { 2671 (*netp)->flowid = m->m_pkthdr.flowid; 2672 #ifdef INVARIANTS 2673 (*netp)->flowidset = 1; 2674 #endif 2675 } 2676 /* 2677 * Ok, we built an association so confirm the address we sent the 2678 * INIT-ACK to. 2679 */ 2680 netl = sctp_findnet(*stcb, to); 2681 /* 2682 * This code should in theory NOT run but 2683 */ 2684 if (netl == NULL) { 2685 /* TSNH! Huh, why do I need to add this address here? */ 2686 int ret; 2687 2688 ret = sctp_add_remote_addr(*stcb, to, SCTP_DONOT_SETSCOPE, 2689 SCTP_IN_COOKIE_PROC); 2690 netl = sctp_findnet(*stcb, to); 2691 } 2692 if (netl) { 2693 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) { 2694 netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 2695 (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL, 2696 netl); 2697 send_int_conf = 1; 2698 } 2699 } 2700 if (*stcb) { 2701 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, *inp_p, 2702 *stcb, NULL); 2703 } 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, (void *)&sac_restart_id, 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->inp_starting_point_for_iterator = NULL; 2785 /* 2786 * copy in the authentication parameters from the 2787 * original endpoint 2788 */ 2789 if (inp->sctp_ep.local_hmacs) 2790 sctp_free_hmaclist(inp->sctp_ep.local_hmacs); 2791 inp->sctp_ep.local_hmacs = 2792 sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs); 2793 if (inp->sctp_ep.local_auth_chunks) 2794 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks); 2795 inp->sctp_ep.local_auth_chunks = 2796 sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks); 2797 2798 /* 2799 * Now we must move it from one hash table to 2800 * another and get the tcb in the right place. 2801 */ 2802 2803 /* 2804 * This is where the one-2-one socket is put into 2805 * the accept state waiting for the accept! 2806 */ 2807 if (*stcb) { 2808 (*stcb)->asoc.state |= SCTP_STATE_IN_ACCEPT_QUEUE; 2809 } 2810 sctp_move_pcb_and_assoc(*inp_p, inp, *stcb); 2811 2812 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2813 SCTP_TCB_UNLOCK((*stcb)); 2814 2815 sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb, 2816 0); 2817 SCTP_TCB_LOCK((*stcb)); 2818 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2819 2820 2821 /* 2822 * now we must check to see if we were aborted while 2823 * the move was going on and the lock/unlock 2824 * happened. 2825 */ 2826 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 2827 /* 2828 * yep it was, we leave the assoc attached 2829 * to the socket since the sctp_inpcb_free() 2830 * call will send an abort for us. 2831 */ 2832 SCTP_INP_DECR_REF(inp); 2833 return (NULL); 2834 } 2835 SCTP_INP_DECR_REF(inp); 2836 /* Switch over to the new guy */ 2837 *inp_p = inp; 2838 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2839 if (send_int_conf) { 2840 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2841 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2842 } 2843 /* 2844 * Pull it from the incomplete queue and wake the 2845 * guy 2846 */ 2847 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2848 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2849 SCTP_TCB_UNLOCK((*stcb)); 2850 SCTP_SOCKET_LOCK(so, 1); 2851 #endif 2852 soisconnected(so); 2853 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2854 SCTP_TCB_LOCK((*stcb)); 2855 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2856 SCTP_SOCKET_UNLOCK(so, 1); 2857 #endif 2858 return (m); 2859 } 2860 } 2861 if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE) { 2862 if (notification) { 2863 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2864 } 2865 if (send_int_conf) { 2866 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2867 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2868 } 2869 } 2870 return (m); 2871 } 2872 2873 static void 2874 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp, 2875 struct sctp_tcb *stcb, struct sctp_nets *net) 2876 { 2877 /* cp must not be used, others call this without a c-ack :-) */ 2878 struct sctp_association *asoc; 2879 2880 SCTPDBG(SCTP_DEBUG_INPUT2, 2881 "sctp_handle_cookie_ack: handling COOKIE-ACK\n"); 2882 if (stcb == NULL) 2883 return; 2884 2885 asoc = &stcb->asoc; 2886 2887 sctp_stop_all_cookie_timers(stcb); 2888 /* process according to association state */ 2889 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) { 2890 /* state change only needed when I am in right state */ 2891 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2892 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 2893 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2894 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2895 stcb->sctp_ep, stcb, asoc->primary_destination); 2896 2897 } 2898 /* update RTO */ 2899 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 2900 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2901 if (asoc->overall_error_count == 0) { 2902 net->RTO = sctp_calculate_rto(stcb, asoc, net, 2903 &asoc->time_entered, sctp_align_safe_nocopy, 2904 SCTP_RTT_FROM_NON_DATA); 2905 } 2906 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 2907 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2908 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2909 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 2910 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2911 struct socket *so; 2912 2913 #endif 2914 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2915 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2916 so = SCTP_INP_SO(stcb->sctp_ep); 2917 atomic_add_int(&stcb->asoc.refcnt, 1); 2918 SCTP_TCB_UNLOCK(stcb); 2919 SCTP_SOCKET_LOCK(so, 1); 2920 SCTP_TCB_LOCK(stcb); 2921 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2922 #endif 2923 if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) { 2924 soisconnected(stcb->sctp_socket); 2925 } 2926 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2927 SCTP_SOCKET_UNLOCK(so, 1); 2928 #endif 2929 } 2930 /* 2931 * since we did not send a HB make sure we don't double 2932 * things 2933 */ 2934 net->hb_responded = 1; 2935 2936 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2937 /* 2938 * We don't need to do the asconf thing, nor hb or 2939 * autoclose if the socket is closed. 2940 */ 2941 goto closed_socket; 2942 } 2943 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 2944 stcb, net); 2945 2946 2947 if (stcb->asoc.sctp_autoclose_ticks && 2948 sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2949 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 2950 stcb->sctp_ep, stcb, NULL); 2951 } 2952 /* 2953 * send ASCONF if parameters are pending and ASCONFs are 2954 * allowed (eg. addresses changed when init/cookie echo were 2955 * in flight) 2956 */ 2957 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) && 2958 (stcb->asoc.peer_supports_asconf) && 2959 (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) { 2960 #ifdef SCTP_TIMER_BASED_ASCONF 2961 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, 2962 stcb->sctp_ep, stcb, 2963 stcb->asoc.primary_destination); 2964 #else 2965 sctp_send_asconf(stcb, stcb->asoc.primary_destination, 2966 SCTP_ADDR_NOT_LOCKED); 2967 #endif 2968 } 2969 } 2970 closed_socket: 2971 /* Toss the cookie if I can */ 2972 sctp_toss_old_cookies(stcb, asoc); 2973 if (!TAILQ_EMPTY(&asoc->sent_queue)) { 2974 /* Restart the timer if we have pending data */ 2975 struct sctp_tmit_chunk *chk; 2976 2977 chk = TAILQ_FIRST(&asoc->sent_queue); 2978 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 2979 } 2980 } 2981 2982 static void 2983 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp, 2984 struct sctp_tcb *stcb) 2985 { 2986 struct sctp_nets *net; 2987 struct sctp_tmit_chunk *lchk; 2988 struct sctp_ecne_chunk bkup; 2989 uint8_t override_bit = 0; 2990 uint32_t tsn, window_data_tsn; 2991 int len; 2992 unsigned int pkt_cnt; 2993 2994 len = ntohs(cp->ch.chunk_length); 2995 if ((len != sizeof(struct sctp_ecne_chunk)) && 2996 (len != sizeof(struct old_sctp_ecne_chunk))) { 2997 return; 2998 } 2999 if (len == sizeof(struct old_sctp_ecne_chunk)) { 3000 /* Its the old format */ 3001 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk)); 3002 bkup.num_pkts_since_cwr = htonl(1); 3003 cp = &bkup; 3004 } 3005 SCTP_STAT_INCR(sctps_recvecne); 3006 tsn = ntohl(cp->tsn); 3007 pkt_cnt = ntohl(cp->num_pkts_since_cwr); 3008 lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead); 3009 if (lchk == NULL) { 3010 window_data_tsn = stcb->asoc.sending_seq - 1; 3011 } else { 3012 window_data_tsn = lchk->rec.data.TSN_seq; 3013 } 3014 3015 /* Find where it was sent to if possible. */ 3016 net = NULL; 3017 TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) { 3018 if (lchk->rec.data.TSN_seq == tsn) { 3019 net = lchk->whoTo; 3020 net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send; 3021 break; 3022 } 3023 if (SCTP_TSN_GT(lchk->rec.data.TSN_seq, tsn)) { 3024 break; 3025 } 3026 } 3027 if (net == NULL) { 3028 /* 3029 * What to do. A previous send of a CWR was possibly lost. 3030 * See how old it is, we may have it marked on the actual 3031 * net. 3032 */ 3033 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 3034 if (tsn == net->last_cwr_tsn) { 3035 /* Found him, send it off */ 3036 goto out; 3037 } 3038 } 3039 /* 3040 * If we reach here, we need to send a special CWR that says 3041 * hey, we did this a long time ago and you lost the 3042 * response. 3043 */ 3044 net = TAILQ_FIRST(&stcb->asoc.nets); 3045 override_bit = SCTP_CWR_REDUCE_OVERRIDE; 3046 } 3047 out: 3048 if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) && 3049 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 3050 /* 3051 * JRS - Use the congestion control given in the pluggable 3052 * CC module 3053 */ 3054 int ocwnd; 3055 3056 ocwnd = net->cwnd; 3057 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt); 3058 /* 3059 * We reduce once every RTT. So we will only lower cwnd at 3060 * the next sending seq i.e. the window_data_tsn 3061 */ 3062 net->cwr_window_tsn = window_data_tsn; 3063 net->ecn_ce_pkt_cnt += pkt_cnt; 3064 net->lost_cnt = pkt_cnt; 3065 net->last_cwr_tsn = tsn; 3066 } else { 3067 override_bit |= SCTP_CWR_IN_SAME_WINDOW; 3068 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) && 3069 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 3070 /* 3071 * Another loss in the same window update how many 3072 * marks/packets lost we have had. 3073 */ 3074 int cnt = 1; 3075 3076 if (pkt_cnt > net->lost_cnt) { 3077 /* Should be the case */ 3078 cnt = (pkt_cnt - net->lost_cnt); 3079 net->ecn_ce_pkt_cnt += cnt; 3080 } 3081 net->lost_cnt = pkt_cnt; 3082 net->last_cwr_tsn = tsn; 3083 /* 3084 * Most CC functions will ignore this call, since we 3085 * are in-window yet of the initial CE the peer saw. 3086 */ 3087 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt); 3088 } 3089 } 3090 /* 3091 * We always send a CWR this way if our previous one was lost our 3092 * peer will get an update, or if it is not time again to reduce we 3093 * still get the cwr to the peer. Note we set the override when we 3094 * could not find the TSN on the chunk or the destination network. 3095 */ 3096 sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit); 3097 } 3098 3099 static void 3100 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net) 3101 { 3102 /* 3103 * Here we get a CWR from the peer. We must look in the outqueue and 3104 * make sure that we have a covered ECNE in teh control chunk part. 3105 * If so remove it. 3106 */ 3107 struct sctp_tmit_chunk *chk; 3108 struct sctp_ecne_chunk *ecne; 3109 int override; 3110 uint32_t cwr_tsn; 3111 3112 cwr_tsn = ntohl(cp->tsn); 3113 3114 override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE; 3115 TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) { 3116 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) { 3117 continue; 3118 } 3119 if ((override == 0) && (chk->whoTo != net)) { 3120 /* Must be from the right src unless override is set */ 3121 continue; 3122 } 3123 ecne = mtod(chk->data, struct sctp_ecne_chunk *); 3124 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) { 3125 /* this covers this ECNE, we can remove it */ 3126 stcb->asoc.ecn_echo_cnt_onq--; 3127 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, 3128 sctp_next); 3129 if (chk->data) { 3130 sctp_m_freem(chk->data); 3131 chk->data = NULL; 3132 } 3133 stcb->asoc.ctrl_queue_cnt--; 3134 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3135 if (override == 0) { 3136 break; 3137 } 3138 } 3139 } 3140 } 3141 3142 static void 3143 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp, 3144 struct sctp_tcb *stcb, struct sctp_nets *net) 3145 { 3146 struct sctp_association *asoc; 3147 3148 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3149 struct socket *so; 3150 3151 #endif 3152 3153 SCTPDBG(SCTP_DEBUG_INPUT2, 3154 "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n"); 3155 if (stcb == NULL) 3156 return; 3157 3158 asoc = &stcb->asoc; 3159 /* process according to association state */ 3160 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 3161 /* unexpected SHUTDOWN-COMPLETE... so ignore... */ 3162 SCTPDBG(SCTP_DEBUG_INPUT2, 3163 "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n"); 3164 SCTP_TCB_UNLOCK(stcb); 3165 return; 3166 } 3167 /* notify upper layer protocol */ 3168 if (stcb->sctp_socket) { 3169 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 3170 /* are the queues empty? they should be */ 3171 if (!TAILQ_EMPTY(&asoc->send_queue) || 3172 !TAILQ_EMPTY(&asoc->sent_queue) || 3173 !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 3174 sctp_report_all_outbound(stcb, 0, SCTP_SO_NOT_LOCKED); 3175 } 3176 } 3177 /* stop the timer */ 3178 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_22); 3179 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 3180 /* free the TCB */ 3181 SCTPDBG(SCTP_DEBUG_INPUT2, 3182 "sctp_handle_shutdown_complete: calls free-asoc\n"); 3183 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3184 so = SCTP_INP_SO(stcb->sctp_ep); 3185 atomic_add_int(&stcb->asoc.refcnt, 1); 3186 SCTP_TCB_UNLOCK(stcb); 3187 SCTP_SOCKET_LOCK(so, 1); 3188 SCTP_TCB_LOCK(stcb); 3189 atomic_subtract_int(&stcb->asoc.refcnt, 1); 3190 #endif 3191 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_23); 3192 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3193 SCTP_SOCKET_UNLOCK(so, 1); 3194 #endif 3195 return; 3196 } 3197 3198 static int 3199 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc, 3200 struct sctp_nets *net, uint8_t flg) 3201 { 3202 switch (desc->chunk_type) { 3203 case SCTP_DATA: 3204 /* find the tsn to resend (possibly */ 3205 { 3206 uint32_t tsn; 3207 struct sctp_tmit_chunk *tp1; 3208 3209 tsn = ntohl(desc->tsn_ifany); 3210 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3211 if (tp1->rec.data.TSN_seq == tsn) { 3212 /* found it */ 3213 break; 3214 } 3215 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, tsn)) { 3216 /* not found */ 3217 tp1 = NULL; 3218 break; 3219 } 3220 } 3221 if (tp1 == NULL) { 3222 /* 3223 * Do it the other way , aka without paying 3224 * attention to queue seq order. 3225 */ 3226 SCTP_STAT_INCR(sctps_pdrpdnfnd); 3227 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3228 if (tp1->rec.data.TSN_seq == tsn) { 3229 /* found it */ 3230 break; 3231 } 3232 } 3233 } 3234 if (tp1 == NULL) { 3235 SCTP_STAT_INCR(sctps_pdrptsnnf); 3236 } 3237 if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) { 3238 uint8_t *ddp; 3239 3240 if (((flg & SCTP_BADCRC) == 0) && 3241 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3242 return (0); 3243 } 3244 if ((stcb->asoc.peers_rwnd == 0) && 3245 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3246 SCTP_STAT_INCR(sctps_pdrpdiwnp); 3247 return (0); 3248 } 3249 if (stcb->asoc.peers_rwnd == 0 && 3250 (flg & SCTP_FROM_MIDDLE_BOX)) { 3251 SCTP_STAT_INCR(sctps_pdrpdizrw); 3252 return (0); 3253 } 3254 ddp = (uint8_t *) (mtod(tp1->data, caddr_t)+ 3255 sizeof(struct sctp_data_chunk)); 3256 { 3257 unsigned int iii; 3258 3259 for (iii = 0; iii < sizeof(desc->data_bytes); 3260 iii++) { 3261 if (ddp[iii] != desc->data_bytes[iii]) { 3262 SCTP_STAT_INCR(sctps_pdrpbadd); 3263 return (-1); 3264 } 3265 } 3266 } 3267 3268 if (tp1->do_rtt) { 3269 /* 3270 * this guy had a RTO calculation 3271 * pending on it, cancel it 3272 */ 3273 if (tp1->whoTo->rto_needed == 0) { 3274 tp1->whoTo->rto_needed = 1; 3275 } 3276 tp1->do_rtt = 0; 3277 } 3278 SCTP_STAT_INCR(sctps_pdrpmark); 3279 if (tp1->sent != SCTP_DATAGRAM_RESEND) 3280 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3281 /* 3282 * mark it as if we were doing a FR, since 3283 * we will be getting gap ack reports behind 3284 * the info from the router. 3285 */ 3286 tp1->rec.data.doing_fast_retransmit = 1; 3287 /* 3288 * mark the tsn with what sequences can 3289 * cause a new FR. 3290 */ 3291 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) { 3292 tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq; 3293 } else { 3294 tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq; 3295 } 3296 3297 /* restart the timer */ 3298 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3299 stcb, tp1->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_24); 3300 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3301 stcb, tp1->whoTo); 3302 3303 /* fix counts and things */ 3304 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 3305 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP, 3306 tp1->whoTo->flight_size, 3307 tp1->book_size, 3308 (uintptr_t) stcb, 3309 tp1->rec.data.TSN_seq); 3310 } 3311 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3312 sctp_flight_size_decrease(tp1); 3313 sctp_total_flight_decrease(stcb, tp1); 3314 } 3315 tp1->sent = SCTP_DATAGRAM_RESEND; 3316 } { 3317 /* audit code */ 3318 unsigned int audit; 3319 3320 audit = 0; 3321 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3322 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3323 audit++; 3324 } 3325 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue, 3326 sctp_next) { 3327 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3328 audit++; 3329 } 3330 if (audit != stcb->asoc.sent_queue_retran_cnt) { 3331 SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n", 3332 audit, stcb->asoc.sent_queue_retran_cnt); 3333 #ifndef SCTP_AUDITING_ENABLED 3334 stcb->asoc.sent_queue_retran_cnt = audit; 3335 #endif 3336 } 3337 } 3338 } 3339 break; 3340 case SCTP_ASCONF: 3341 { 3342 struct sctp_tmit_chunk *asconf; 3343 3344 TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue, 3345 sctp_next) { 3346 if (asconf->rec.chunk_id.id == SCTP_ASCONF) { 3347 break; 3348 } 3349 } 3350 if (asconf) { 3351 if (asconf->sent != SCTP_DATAGRAM_RESEND) 3352 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3353 asconf->sent = SCTP_DATAGRAM_RESEND; 3354 asconf->snd_count--; 3355 } 3356 } 3357 break; 3358 case SCTP_INITIATION: 3359 /* resend the INIT */ 3360 stcb->asoc.dropped_special_cnt++; 3361 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) { 3362 /* 3363 * If we can get it in, in a few attempts we do 3364 * this, otherwise we let the timer fire. 3365 */ 3366 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, 3367 stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_25); 3368 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 3369 } 3370 break; 3371 case SCTP_SELECTIVE_ACK: 3372 case SCTP_NR_SELECTIVE_ACK: 3373 /* resend the sack */ 3374 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED); 3375 break; 3376 case SCTP_HEARTBEAT_REQUEST: 3377 /* resend a demand HB */ 3378 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) { 3379 /* 3380 * Only retransmit if we KNOW we wont destroy the 3381 * tcb 3382 */ 3383 (void)sctp_send_hb(stcb, 1, net, SCTP_SO_NOT_LOCKED); 3384 } 3385 break; 3386 case SCTP_SHUTDOWN: 3387 sctp_send_shutdown(stcb, net); 3388 break; 3389 case SCTP_SHUTDOWN_ACK: 3390 sctp_send_shutdown_ack(stcb, net); 3391 break; 3392 case SCTP_COOKIE_ECHO: 3393 { 3394 struct sctp_tmit_chunk *cookie; 3395 3396 cookie = NULL; 3397 TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, 3398 sctp_next) { 3399 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) { 3400 break; 3401 } 3402 } 3403 if (cookie) { 3404 if (cookie->sent != SCTP_DATAGRAM_RESEND) 3405 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3406 cookie->sent = SCTP_DATAGRAM_RESEND; 3407 sctp_stop_all_cookie_timers(stcb); 3408 } 3409 } 3410 break; 3411 case SCTP_COOKIE_ACK: 3412 sctp_send_cookie_ack(stcb); 3413 break; 3414 case SCTP_ASCONF_ACK: 3415 /* resend last asconf ack */ 3416 sctp_send_asconf_ack(stcb); 3417 break; 3418 case SCTP_FORWARD_CUM_TSN: 3419 send_forward_tsn(stcb, &stcb->asoc); 3420 break; 3421 /* can't do anything with these */ 3422 case SCTP_PACKET_DROPPED: 3423 case SCTP_INITIATION_ACK: /* this should not happen */ 3424 case SCTP_HEARTBEAT_ACK: 3425 case SCTP_ABORT_ASSOCIATION: 3426 case SCTP_OPERATION_ERROR: 3427 case SCTP_SHUTDOWN_COMPLETE: 3428 case SCTP_ECN_ECHO: 3429 case SCTP_ECN_CWR: 3430 default: 3431 break; 3432 } 3433 return (0); 3434 } 3435 3436 void 3437 sctp_reset_in_stream(struct sctp_tcb *stcb, int number_entries, uint16_t * list) 3438 { 3439 int i; 3440 uint16_t temp; 3441 3442 /* 3443 * We set things to 0xffff since this is the last delivered sequence 3444 * and we will be sending in 0 after the reset. 3445 */ 3446 3447 if (number_entries) { 3448 for (i = 0; i < number_entries; i++) { 3449 temp = ntohs(list[i]); 3450 if (temp >= stcb->asoc.streamincnt) { 3451 continue; 3452 } 3453 stcb->asoc.strmin[temp].last_sequence_delivered = 0xffff; 3454 } 3455 } else { 3456 list = NULL; 3457 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3458 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff; 3459 } 3460 } 3461 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3462 } 3463 3464 static void 3465 sctp_reset_out_streams(struct sctp_tcb *stcb, int number_entries, uint16_t * list) 3466 { 3467 int i; 3468 3469 if (number_entries == 0) { 3470 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3471 stcb->asoc.strmout[i].next_sequence_sent = 0; 3472 } 3473 } else if (number_entries) { 3474 for (i = 0; i < number_entries; i++) { 3475 uint16_t temp; 3476 3477 temp = ntohs(list[i]); 3478 if (temp >= stcb->asoc.streamoutcnt) { 3479 /* no such stream */ 3480 continue; 3481 } 3482 stcb->asoc.strmout[temp].next_sequence_sent = 0; 3483 } 3484 } 3485 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3486 } 3487 3488 3489 struct sctp_stream_reset_out_request * 3490 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk) 3491 { 3492 struct sctp_association *asoc; 3493 struct sctp_stream_reset_out_req *req; 3494 struct sctp_stream_reset_out_request *r; 3495 struct sctp_tmit_chunk *chk; 3496 int len, clen; 3497 3498 asoc = &stcb->asoc; 3499 if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 3500 asoc->stream_reset_outstanding = 0; 3501 return (NULL); 3502 } 3503 if (stcb->asoc.str_reset == NULL) { 3504 asoc->stream_reset_outstanding = 0; 3505 return (NULL); 3506 } 3507 chk = stcb->asoc.str_reset; 3508 if (chk->data == NULL) { 3509 return (NULL); 3510 } 3511 if (bchk) { 3512 /* he wants a copy of the chk pointer */ 3513 *bchk = chk; 3514 } 3515 clen = chk->send_size; 3516 req = mtod(chk->data, struct sctp_stream_reset_out_req *); 3517 r = &req->sr_req; 3518 if (ntohl(r->request_seq) == seq) { 3519 /* found it */ 3520 return (r); 3521 } 3522 len = SCTP_SIZE32(ntohs(r->ph.param_length)); 3523 if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) { 3524 /* move to the next one, there can only be a max of two */ 3525 r = (struct sctp_stream_reset_out_request *)((caddr_t)r + len); 3526 if (ntohl(r->request_seq) == seq) { 3527 return (r); 3528 } 3529 } 3530 /* that seq is not here */ 3531 return (NULL); 3532 } 3533 3534 static void 3535 sctp_clean_up_stream_reset(struct sctp_tcb *stcb) 3536 { 3537 struct sctp_association *asoc; 3538 struct sctp_tmit_chunk *chk = stcb->asoc.str_reset; 3539 3540 if (stcb->asoc.str_reset == NULL) { 3541 return; 3542 } 3543 asoc = &stcb->asoc; 3544 3545 sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_26); 3546 TAILQ_REMOVE(&asoc->control_send_queue, 3547 chk, 3548 sctp_next); 3549 if (chk->data) { 3550 sctp_m_freem(chk->data); 3551 chk->data = NULL; 3552 } 3553 asoc->ctrl_queue_cnt--; 3554 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3555 /* sa_ignore NO_NULL_CHK */ 3556 stcb->asoc.str_reset = NULL; 3557 } 3558 3559 3560 static int 3561 sctp_handle_stream_reset_response(struct sctp_tcb *stcb, 3562 uint32_t seq, uint32_t action, 3563 struct sctp_stream_reset_response *respin) 3564 { 3565 uint16_t type; 3566 int lparm_len; 3567 struct sctp_association *asoc = &stcb->asoc; 3568 struct sctp_tmit_chunk *chk; 3569 struct sctp_stream_reset_out_request *srparam; 3570 int number_entries; 3571 3572 if (asoc->stream_reset_outstanding == 0) { 3573 /* duplicate */ 3574 return (0); 3575 } 3576 if (seq == stcb->asoc.str_reset_seq_out) { 3577 srparam = sctp_find_stream_reset(stcb, seq, &chk); 3578 if (srparam) { 3579 stcb->asoc.str_reset_seq_out++; 3580 type = ntohs(srparam->ph.param_type); 3581 lparm_len = ntohs(srparam->ph.param_length); 3582 if (type == SCTP_STR_RESET_OUT_REQUEST) { 3583 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t); 3584 asoc->stream_reset_out_is_outstanding = 0; 3585 if (asoc->stream_reset_outstanding) 3586 asoc->stream_reset_outstanding--; 3587 if (action == SCTP_STREAM_RESET_PERFORMED) { 3588 /* do it */ 3589 sctp_reset_out_streams(stcb, number_entries, srparam->list_of_streams); 3590 } else { 3591 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED); 3592 } 3593 } else if (type == SCTP_STR_RESET_IN_REQUEST) { 3594 /* Answered my request */ 3595 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t); 3596 if (asoc->stream_reset_outstanding) 3597 asoc->stream_reset_outstanding--; 3598 if (action != SCTP_STREAM_RESET_PERFORMED) { 3599 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb, number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED); 3600 } 3601 } else if (type == SCTP_STR_RESET_ADD_STREAMS) { 3602 /* Ok we now may have more streams */ 3603 if (asoc->stream_reset_outstanding) 3604 asoc->stream_reset_outstanding--; 3605 if (action == SCTP_STREAM_RESET_PERFORMED) { 3606 /* Put the new streams into effect */ 3607 stcb->asoc.streamoutcnt = stcb->asoc.strm_realoutsize; 3608 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_ADD_OK, stcb, 3609 (uint32_t) stcb->asoc.streamoutcnt, NULL, SCTP_SO_NOT_LOCKED); 3610 } else { 3611 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_ADD_FAIL, stcb, 3612 (uint32_t) stcb->asoc.streamoutcnt, NULL, SCTP_SO_NOT_LOCKED); 3613 } 3614 } else if (type == SCTP_STR_RESET_TSN_REQUEST) { 3615 /** 3616 * a) Adopt the new in tsn. 3617 * b) reset the map 3618 * c) Adopt the new out-tsn 3619 */ 3620 struct sctp_stream_reset_response_tsn *resp; 3621 struct sctp_forward_tsn_chunk fwdtsn; 3622 int abort_flag = 0; 3623 3624 if (respin == NULL) { 3625 /* huh ? */ 3626 return (0); 3627 } 3628 if (action == SCTP_STREAM_RESET_PERFORMED) { 3629 resp = (struct sctp_stream_reset_response_tsn *)respin; 3630 asoc->stream_reset_outstanding--; 3631 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3632 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3633 fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1); 3634 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3635 if (abort_flag) { 3636 return (1); 3637 } 3638 stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1); 3639 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3640 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3641 } 3642 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 3643 stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn); 3644 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 3645 3646 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map; 3647 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size); 3648 3649 stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn); 3650 stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn; 3651 3652 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL); 3653 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL); 3654 3655 } 3656 } 3657 /* get rid of the request and get the request flags */ 3658 if (asoc->stream_reset_outstanding == 0) { 3659 sctp_clean_up_stream_reset(stcb); 3660 } 3661 } 3662 } 3663 return (0); 3664 } 3665 3666 static void 3667 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb, 3668 struct sctp_tmit_chunk *chk, 3669 struct sctp_stream_reset_in_request *req, int trunc) 3670 { 3671 uint32_t seq; 3672 int len, i; 3673 int number_entries; 3674 uint16_t temp; 3675 3676 /* 3677 * peer wants me to send a str-reset to him for my outgoing seq's if 3678 * seq_in is right. 3679 */ 3680 struct sctp_association *asoc = &stcb->asoc; 3681 3682 seq = ntohl(req->request_seq); 3683 if (asoc->str_reset_seq_in == seq) { 3684 if (trunc) { 3685 /* Can't do it, since they exceeded our buffer size */ 3686 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3687 asoc->last_reset_action[0] = SCTP_STREAM_RESET_DENIED; 3688 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3689 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) { 3690 len = ntohs(req->ph.param_length); 3691 number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t)); 3692 for (i = 0; i < number_entries; i++) { 3693 temp = ntohs(req->list_of_streams[i]); 3694 req->list_of_streams[i] = temp; 3695 } 3696 /* move the reset action back one */ 3697 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3698 asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 3699 sctp_add_stream_reset_out(chk, number_entries, req->list_of_streams, 3700 asoc->str_reset_seq_out, 3701 seq, (asoc->sending_seq - 1)); 3702 asoc->stream_reset_out_is_outstanding = 1; 3703 asoc->str_reset = chk; 3704 sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo); 3705 stcb->asoc.stream_reset_outstanding++; 3706 } else { 3707 /* Can't do it, since we have sent one out */ 3708 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3709 asoc->last_reset_action[0] = SCTP_STREAM_RESET_TRY_LATER; 3710 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3711 } 3712 asoc->str_reset_seq_in++; 3713 } else if (asoc->str_reset_seq_in - 1 == seq) { 3714 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3715 } else if (asoc->str_reset_seq_in - 2 == seq) { 3716 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3717 } else { 3718 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO); 3719 } 3720 } 3721 3722 static int 3723 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb, 3724 struct sctp_tmit_chunk *chk, 3725 struct sctp_stream_reset_tsn_request *req) 3726 { 3727 /* reset all in and out and update the tsn */ 3728 /* 3729 * A) reset my str-seq's on in and out. B) Select a receive next, 3730 * and set cum-ack to it. Also process this selected number as a 3731 * fwd-tsn as well. C) set in the response my next sending seq. 3732 */ 3733 struct sctp_forward_tsn_chunk fwdtsn; 3734 struct sctp_association *asoc = &stcb->asoc; 3735 int abort_flag = 0; 3736 uint32_t seq; 3737 3738 seq = ntohl(req->request_seq); 3739 if (asoc->str_reset_seq_in == seq) { 3740 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3741 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3742 fwdtsn.ch.chunk_flags = 0; 3743 fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1); 3744 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3745 if (abort_flag) { 3746 return (1); 3747 } 3748 stcb->asoc.highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA; 3749 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3750 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3751 } 3752 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 3753 stcb->asoc.mapping_array_base_tsn = stcb->asoc.highest_tsn_inside_map + 1; 3754 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 3755 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map; 3756 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size); 3757 atomic_add_int(&stcb->asoc.sending_seq, 1); 3758 /* save off historical data for retrans */ 3759 stcb->asoc.last_sending_seq[1] = stcb->asoc.last_sending_seq[0]; 3760 stcb->asoc.last_sending_seq[0] = stcb->asoc.sending_seq; 3761 stcb->asoc.last_base_tsnsent[1] = stcb->asoc.last_base_tsnsent[0]; 3762 stcb->asoc.last_base_tsnsent[0] = stcb->asoc.mapping_array_base_tsn; 3763 3764 sctp_add_stream_reset_result_tsn(chk, 3765 ntohl(req->request_seq), 3766 SCTP_STREAM_RESET_PERFORMED, 3767 stcb->asoc.sending_seq, 3768 stcb->asoc.mapping_array_base_tsn); 3769 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL); 3770 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL); 3771 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3772 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 3773 3774 asoc->str_reset_seq_in++; 3775 } else if (asoc->str_reset_seq_in - 1 == seq) { 3776 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3777 stcb->asoc.last_sending_seq[0], 3778 stcb->asoc.last_base_tsnsent[0] 3779 ); 3780 } else if (asoc->str_reset_seq_in - 2 == seq) { 3781 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1], 3782 stcb->asoc.last_sending_seq[1], 3783 stcb->asoc.last_base_tsnsent[1] 3784 ); 3785 } else { 3786 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO); 3787 } 3788 return (0); 3789 } 3790 3791 static void 3792 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb, 3793 struct sctp_tmit_chunk *chk, 3794 struct sctp_stream_reset_out_request *req, int trunc) 3795 { 3796 uint32_t seq, tsn; 3797 int number_entries, len; 3798 struct sctp_association *asoc = &stcb->asoc; 3799 3800 seq = ntohl(req->request_seq); 3801 3802 /* now if its not a duplicate we process it */ 3803 if (asoc->str_reset_seq_in == seq) { 3804 len = ntohs(req->ph.param_length); 3805 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t)); 3806 /* 3807 * the sender is resetting, handle the list issue.. we must 3808 * a) verify if we can do the reset, if so no problem b) If 3809 * we can't do the reset we must copy the request. c) queue 3810 * it, and setup the data in processor to trigger it off 3811 * when needed and dequeue all the queued data. 3812 */ 3813 tsn = ntohl(req->send_reset_at_tsn); 3814 3815 /* move the reset action back one */ 3816 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3817 if (trunc) { 3818 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_DENIED); 3819 asoc->last_reset_action[0] = SCTP_STREAM_RESET_DENIED; 3820 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) { 3821 /* we can do it now */ 3822 sctp_reset_in_stream(stcb, number_entries, req->list_of_streams); 3823 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_PERFORMED); 3824 asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 3825 } else { 3826 /* 3827 * we must queue it up and thus wait for the TSN's 3828 * to arrive that are at or before tsn 3829 */ 3830 struct sctp_stream_reset_list *liste; 3831 int siz; 3832 3833 siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t)); 3834 SCTP_MALLOC(liste, struct sctp_stream_reset_list *, 3835 siz, SCTP_M_STRESET); 3836 if (liste == NULL) { 3837 /* gak out of memory */ 3838 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_DENIED); 3839 asoc->last_reset_action[0] = SCTP_STREAM_RESET_DENIED; 3840 return; 3841 } 3842 liste->tsn = tsn; 3843 liste->number_entries = number_entries; 3844 memcpy(&liste->req, req, 3845 (sizeof(struct sctp_stream_reset_out_request) + (number_entries * sizeof(uint16_t)))); 3846 TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp); 3847 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_PERFORMED); 3848 asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 3849 } 3850 asoc->str_reset_seq_in++; 3851 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3852 /* 3853 * one seq back, just echo back last action since my 3854 * response was lost. 3855 */ 3856 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3857 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3858 /* 3859 * two seq back, just echo back last action since my 3860 * response was lost. 3861 */ 3862 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3863 } else { 3864 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO); 3865 } 3866 } 3867 3868 static void 3869 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 3870 struct sctp_stream_reset_add_strm *str_add) 3871 { 3872 /* 3873 * Peer is requesting to add more streams. If its within our 3874 * max-streams we will allow it. 3875 */ 3876 uint16_t num_stream, i; 3877 uint32_t seq; 3878 struct sctp_association *asoc = &stcb->asoc; 3879 struct sctp_queued_to_read *ctl, *nctl; 3880 3881 /* Get the number. */ 3882 seq = ntohl(str_add->request_seq); 3883 num_stream = ntohs(str_add->number_of_streams); 3884 /* Now what would be the new total? */ 3885 if (asoc->str_reset_seq_in == seq) { 3886 num_stream += stcb->asoc.streamincnt; 3887 if (num_stream > stcb->asoc.max_inbound_streams) { 3888 /* We must reject it they ask for to many */ 3889 denied: 3890 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_DENIED); 3891 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3892 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_DENIED; 3893 } else { 3894 /* Ok, we can do that :-) */ 3895 struct sctp_stream_in *oldstrm; 3896 3897 /* save off the old */ 3898 oldstrm = stcb->asoc.strmin; 3899 SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *, 3900 (num_stream * sizeof(struct sctp_stream_in)), 3901 SCTP_M_STRMI); 3902 if (stcb->asoc.strmin == NULL) { 3903 stcb->asoc.strmin = oldstrm; 3904 goto denied; 3905 } 3906 /* copy off the old data */ 3907 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3908 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 3909 stcb->asoc.strmin[i].stream_no = i; 3910 stcb->asoc.strmin[i].last_sequence_delivered = oldstrm[i].last_sequence_delivered; 3911 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started; 3912 /* now anything on those queues? */ 3913 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next, nctl) { 3914 TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next); 3915 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next); 3916 } 3917 } 3918 /* Init the new streams */ 3919 for (i = stcb->asoc.streamincnt; i < num_stream; i++) { 3920 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 3921 stcb->asoc.strmin[i].stream_no = i; 3922 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff; 3923 stcb->asoc.strmin[i].delivery_started = 0; 3924 } 3925 SCTP_FREE(oldstrm, SCTP_M_STRMI); 3926 /* update the size */ 3927 stcb->asoc.streamincnt = num_stream; 3928 /* Send the ack */ 3929 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_PERFORMED); 3930 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3931 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 3932 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_INSTREAM_ADD_OK, stcb, 3933 (uint32_t) stcb->asoc.streamincnt, NULL, SCTP_SO_NOT_LOCKED); 3934 } 3935 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3936 /* 3937 * one seq back, just echo back last action since my 3938 * response was lost. 3939 */ 3940 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3941 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3942 /* 3943 * two seq back, just echo back last action since my 3944 * response was lost. 3945 */ 3946 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3947 } else { 3948 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO); 3949 3950 } 3951 } 3952 3953 #ifdef __GNUC__ 3954 __attribute__((noinline)) 3955 #endif 3956 static int 3957 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset, 3958 struct sctp_stream_reset_out_req *sr_req) 3959 { 3960 int chk_length, param_len, ptype; 3961 struct sctp_paramhdr pstore; 3962 uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE]; 3963 3964 uint32_t seq; 3965 int num_req = 0; 3966 int trunc = 0; 3967 struct sctp_tmit_chunk *chk; 3968 struct sctp_chunkhdr *ch; 3969 struct sctp_paramhdr *ph; 3970 int ret_code = 0; 3971 int num_param = 0; 3972 3973 /* now it may be a reset or a reset-response */ 3974 chk_length = ntohs(sr_req->ch.chunk_length); 3975 3976 /* setup for adding the response */ 3977 sctp_alloc_a_chunk(stcb, chk); 3978 if (chk == NULL) { 3979 return (ret_code); 3980 } 3981 chk->rec.chunk_id.id = SCTP_STREAM_RESET; 3982 chk->rec.chunk_id.can_take_data = 0; 3983 chk->asoc = &stcb->asoc; 3984 chk->no_fr_allowed = 0; 3985 chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr); 3986 chk->book_size_scale = 0; 3987 chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA); 3988 if (chk->data == NULL) { 3989 strres_nochunk: 3990 if (chk->data) { 3991 sctp_m_freem(chk->data); 3992 chk->data = NULL; 3993 } 3994 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3995 return (ret_code); 3996 } 3997 SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD); 3998 3999 /* setup chunk parameters */ 4000 chk->sent = SCTP_DATAGRAM_UNSENT; 4001 chk->snd_count = 0; 4002 chk->whoTo = stcb->asoc.primary_destination; 4003 atomic_add_int(&chk->whoTo->ref_count, 1); 4004 4005 ch = mtod(chk->data, struct sctp_chunkhdr *); 4006 ch->chunk_type = SCTP_STREAM_RESET; 4007 ch->chunk_flags = 0; 4008 ch->chunk_length = htons(chk->send_size); 4009 SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size); 4010 offset += sizeof(struct sctp_chunkhdr); 4011 while ((size_t)chk_length >= sizeof(struct sctp_stream_reset_tsn_request)) { 4012 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *) & pstore); 4013 if (ph == NULL) 4014 break; 4015 param_len = ntohs(ph->param_length); 4016 if (param_len < (int)sizeof(struct sctp_stream_reset_tsn_request)) { 4017 /* bad param */ 4018 break; 4019 } 4020 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, (int)sizeof(cstore)), 4021 (uint8_t *) & cstore); 4022 ptype = ntohs(ph->param_type); 4023 num_param++; 4024 if (param_len > (int)sizeof(cstore)) { 4025 trunc = 1; 4026 } else { 4027 trunc = 0; 4028 } 4029 4030 if (num_param > SCTP_MAX_RESET_PARAMS) { 4031 /* hit the max of parameters already sorry.. */ 4032 break; 4033 } 4034 if (ptype == SCTP_STR_RESET_OUT_REQUEST) { 4035 struct sctp_stream_reset_out_request *req_out; 4036 4037 req_out = (struct sctp_stream_reset_out_request *)ph; 4038 num_req++; 4039 if (stcb->asoc.stream_reset_outstanding) { 4040 seq = ntohl(req_out->response_seq); 4041 if (seq == stcb->asoc.str_reset_seq_out) { 4042 /* implicit ack */ 4043 (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_PERFORMED, NULL); 4044 } 4045 } 4046 sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc); 4047 } else if (ptype == SCTP_STR_RESET_ADD_STREAMS) { 4048 struct sctp_stream_reset_add_strm *str_add; 4049 4050 str_add = (struct sctp_stream_reset_add_strm *)ph; 4051 num_req++; 4052 sctp_handle_str_reset_add_strm(stcb, chk, str_add); 4053 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) { 4054 struct sctp_stream_reset_in_request *req_in; 4055 4056 num_req++; 4057 4058 req_in = (struct sctp_stream_reset_in_request *)ph; 4059 4060 sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc); 4061 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) { 4062 struct sctp_stream_reset_tsn_request *req_tsn; 4063 4064 num_req++; 4065 req_tsn = (struct sctp_stream_reset_tsn_request *)ph; 4066 4067 if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) { 4068 ret_code = 1; 4069 goto strres_nochunk; 4070 } 4071 /* no more */ 4072 break; 4073 } else if (ptype == SCTP_STR_RESET_RESPONSE) { 4074 struct sctp_stream_reset_response *resp; 4075 uint32_t result; 4076 4077 resp = (struct sctp_stream_reset_response *)ph; 4078 seq = ntohl(resp->response_seq); 4079 result = ntohl(resp->result); 4080 if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) { 4081 ret_code = 1; 4082 goto strres_nochunk; 4083 } 4084 } else { 4085 break; 4086 } 4087 offset += SCTP_SIZE32(param_len); 4088 chk_length -= SCTP_SIZE32(param_len); 4089 } 4090 if (num_req == 0) { 4091 /* we have no response free the stuff */ 4092 goto strres_nochunk; 4093 } 4094 /* ok we have a chunk to link in */ 4095 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, 4096 chk, 4097 sctp_next); 4098 stcb->asoc.ctrl_queue_cnt++; 4099 return (ret_code); 4100 } 4101 4102 /* 4103 * Handle a router or endpoints report of a packet loss, there are two ways 4104 * to handle this, either we get the whole packet and must disect it 4105 * ourselves (possibly with truncation and or corruption) or it is a summary 4106 * from a middle box that did the disectting for us. 4107 */ 4108 static void 4109 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp, 4110 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 4111 { 4112 uint32_t bottle_bw, on_queue; 4113 uint16_t trunc_len; 4114 unsigned int chlen; 4115 unsigned int at; 4116 struct sctp_chunk_desc desc; 4117 struct sctp_chunkhdr *ch; 4118 4119 chlen = ntohs(cp->ch.chunk_length); 4120 chlen -= sizeof(struct sctp_pktdrop_chunk); 4121 /* XXX possible chlen underflow */ 4122 if (chlen == 0) { 4123 ch = NULL; 4124 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) 4125 SCTP_STAT_INCR(sctps_pdrpbwrpt); 4126 } else { 4127 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr)); 4128 chlen -= sizeof(struct sctphdr); 4129 /* XXX possible chlen underflow */ 4130 memset(&desc, 0, sizeof(desc)); 4131 } 4132 trunc_len = (uint16_t) ntohs(cp->trunc_len); 4133 if (trunc_len > limit) { 4134 trunc_len = limit; 4135 } 4136 /* now the chunks themselves */ 4137 while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) { 4138 desc.chunk_type = ch->chunk_type; 4139 /* get amount we need to move */ 4140 at = ntohs(ch->chunk_length); 4141 if (at < sizeof(struct sctp_chunkhdr)) { 4142 /* corrupt chunk, maybe at the end? */ 4143 SCTP_STAT_INCR(sctps_pdrpcrupt); 4144 break; 4145 } 4146 if (trunc_len == 0) { 4147 /* we are supposed to have all of it */ 4148 if (at > chlen) { 4149 /* corrupt skip it */ 4150 SCTP_STAT_INCR(sctps_pdrpcrupt); 4151 break; 4152 } 4153 } else { 4154 /* is there enough of it left ? */ 4155 if (desc.chunk_type == SCTP_DATA) { 4156 if (chlen < (sizeof(struct sctp_data_chunk) + 4157 sizeof(desc.data_bytes))) { 4158 break; 4159 } 4160 } else { 4161 if (chlen < sizeof(struct sctp_chunkhdr)) { 4162 break; 4163 } 4164 } 4165 } 4166 if (desc.chunk_type == SCTP_DATA) { 4167 /* can we get out the tsn? */ 4168 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4169 SCTP_STAT_INCR(sctps_pdrpmbda); 4170 4171 if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) { 4172 /* yep */ 4173 struct sctp_data_chunk *dcp; 4174 uint8_t *ddp; 4175 unsigned int iii; 4176 4177 dcp = (struct sctp_data_chunk *)ch; 4178 ddp = (uint8_t *) (dcp + 1); 4179 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) { 4180 desc.data_bytes[iii] = ddp[iii]; 4181 } 4182 desc.tsn_ifany = dcp->dp.tsn; 4183 } else { 4184 /* nope we are done. */ 4185 SCTP_STAT_INCR(sctps_pdrpnedat); 4186 break; 4187 } 4188 } else { 4189 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4190 SCTP_STAT_INCR(sctps_pdrpmbct); 4191 } 4192 4193 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) { 4194 SCTP_STAT_INCR(sctps_pdrppdbrk); 4195 break; 4196 } 4197 if (SCTP_SIZE32(at) > chlen) { 4198 break; 4199 } 4200 chlen -= SCTP_SIZE32(at); 4201 if (chlen < sizeof(struct sctp_chunkhdr)) { 4202 /* done, none left */ 4203 break; 4204 } 4205 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at)); 4206 } 4207 /* Now update any rwnd --- possibly */ 4208 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) { 4209 /* From a peer, we get a rwnd report */ 4210 uint32_t a_rwnd; 4211 4212 SCTP_STAT_INCR(sctps_pdrpfehos); 4213 4214 bottle_bw = ntohl(cp->bottle_bw); 4215 on_queue = ntohl(cp->current_onq); 4216 if (bottle_bw && on_queue) { 4217 /* a rwnd report is in here */ 4218 if (bottle_bw > on_queue) 4219 a_rwnd = bottle_bw - on_queue; 4220 else 4221 a_rwnd = 0; 4222 4223 if (a_rwnd == 0) 4224 stcb->asoc.peers_rwnd = 0; 4225 else { 4226 if (a_rwnd > stcb->asoc.total_flight) { 4227 stcb->asoc.peers_rwnd = 4228 a_rwnd - stcb->asoc.total_flight; 4229 } else { 4230 stcb->asoc.peers_rwnd = 0; 4231 } 4232 if (stcb->asoc.peers_rwnd < 4233 stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 4234 /* SWS sender side engages */ 4235 stcb->asoc.peers_rwnd = 0; 4236 } 4237 } 4238 } 4239 } else { 4240 SCTP_STAT_INCR(sctps_pdrpfmbox); 4241 } 4242 4243 /* now middle boxes in sat networks get a cwnd bump */ 4244 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) && 4245 (stcb->asoc.sat_t3_loss_recovery == 0) && 4246 (stcb->asoc.sat_network)) { 4247 /* 4248 * This is debateable but for sat networks it makes sense 4249 * Note if a T3 timer has went off, we will prohibit any 4250 * changes to cwnd until we exit the t3 loss recovery. 4251 */ 4252 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb, 4253 net, cp, &bottle_bw, &on_queue); 4254 } 4255 } 4256 4257 /* 4258 * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to 4259 * still contain IP/SCTP header - stcb: is the tcb found for this packet - 4260 * offset: offset into the mbuf chain to first chunkhdr - length: is the 4261 * length of the complete packet outputs: - length: modified to remaining 4262 * length after control processing - netp: modified to new sctp_nets after 4263 * cookie-echo processing - return NULL to discard the packet (ie. no asoc, 4264 * bad packet,...) otherwise return the tcb for this packet 4265 */ 4266 #ifdef __GNUC__ 4267 __attribute__((noinline)) 4268 #endif 4269 static struct sctp_tcb * 4270 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length, 4271 struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp, 4272 struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen, 4273 uint32_t vrf_id, uint16_t port) 4274 { 4275 struct sctp_association *asoc; 4276 uint32_t vtag_in; 4277 int num_chunks = 0; /* number of control chunks processed */ 4278 uint32_t chk_length; 4279 int ret; 4280 int abort_no_unlock = 0; 4281 int ecne_seen = 0; 4282 4283 /* 4284 * How big should this be, and should it be alloc'd? Lets try the 4285 * d-mtu-ceiling for now (2k) and that should hopefully work ... 4286 * until we get into jumbo grams and such.. 4287 */ 4288 uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE]; 4289 struct sctp_tcb *locked_tcb = stcb; 4290 int got_auth = 0; 4291 uint32_t auth_offset = 0, auth_len = 0; 4292 int auth_skipped = 0; 4293 int asconf_cnt = 0; 4294 4295 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4296 struct socket *so; 4297 4298 #endif 4299 4300 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n", 4301 iphlen, *offset, length, stcb); 4302 4303 /* validate chunk header length... */ 4304 if (ntohs(ch->chunk_length) < sizeof(*ch)) { 4305 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n", 4306 ntohs(ch->chunk_length)); 4307 if (locked_tcb) { 4308 SCTP_TCB_UNLOCK(locked_tcb); 4309 } 4310 return (NULL); 4311 } 4312 /* 4313 * validate the verification tag 4314 */ 4315 vtag_in = ntohl(sh->v_tag); 4316 4317 if (locked_tcb) { 4318 SCTP_TCB_LOCK_ASSERT(locked_tcb); 4319 } 4320 if (ch->chunk_type == SCTP_INITIATION) { 4321 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n", 4322 ntohs(ch->chunk_length), vtag_in); 4323 if (vtag_in != 0) { 4324 /* protocol error- silently discard... */ 4325 SCTP_STAT_INCR(sctps_badvtag); 4326 if (locked_tcb) { 4327 SCTP_TCB_UNLOCK(locked_tcb); 4328 } 4329 return (NULL); 4330 } 4331 } else if (ch->chunk_type != SCTP_COOKIE_ECHO) { 4332 /* 4333 * If there is no stcb, skip the AUTH chunk and process 4334 * later after a stcb is found (to validate the lookup was 4335 * valid. 4336 */ 4337 if ((ch->chunk_type == SCTP_AUTHENTICATION) && 4338 (stcb == NULL) && 4339 !SCTP_BASE_SYSCTL(sctp_auth_disable)) { 4340 /* save this chunk for later processing */ 4341 auth_skipped = 1; 4342 auth_offset = *offset; 4343 auth_len = ntohs(ch->chunk_length); 4344 4345 /* (temporarily) move past this chunk */ 4346 *offset += SCTP_SIZE32(auth_len); 4347 if (*offset >= length) { 4348 /* no more data left in the mbuf chain */ 4349 *offset = length; 4350 if (locked_tcb) { 4351 SCTP_TCB_UNLOCK(locked_tcb); 4352 } 4353 return (NULL); 4354 } 4355 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4356 sizeof(struct sctp_chunkhdr), chunk_buf); 4357 } 4358 if (ch == NULL) { 4359 /* Help */ 4360 *offset = length; 4361 if (locked_tcb) { 4362 SCTP_TCB_UNLOCK(locked_tcb); 4363 } 4364 return (NULL); 4365 } 4366 if (ch->chunk_type == SCTP_COOKIE_ECHO) { 4367 goto process_control_chunks; 4368 } 4369 /* 4370 * first check if it's an ASCONF with an unknown src addr we 4371 * need to look inside to find the association 4372 */ 4373 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) { 4374 struct sctp_chunkhdr *asconf_ch = ch; 4375 uint32_t asconf_offset = 0, asconf_len = 0; 4376 4377 /* inp's refcount may be reduced */ 4378 SCTP_INP_INCR_REF(inp); 4379 4380 asconf_offset = *offset; 4381 do { 4382 asconf_len = ntohs(asconf_ch->chunk_length); 4383 if (asconf_len < sizeof(struct sctp_asconf_paramhdr)) 4384 break; 4385 stcb = sctp_findassociation_ep_asconf(m, iphlen, 4386 *offset, sh, &inp, netp, vrf_id); 4387 if (stcb != NULL) 4388 break; 4389 asconf_offset += SCTP_SIZE32(asconf_len); 4390 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset, 4391 sizeof(struct sctp_chunkhdr), chunk_buf); 4392 } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF); 4393 if (stcb == NULL) { 4394 /* 4395 * reduce inp's refcount if not reduced in 4396 * sctp_findassociation_ep_asconf(). 4397 */ 4398 SCTP_INP_DECR_REF(inp); 4399 } else { 4400 locked_tcb = stcb; 4401 } 4402 4403 /* now go back and verify any auth chunk to be sure */ 4404 if (auth_skipped && (stcb != NULL)) { 4405 struct sctp_auth_chunk *auth; 4406 4407 auth = (struct sctp_auth_chunk *) 4408 sctp_m_getptr(m, auth_offset, 4409 auth_len, chunk_buf); 4410 got_auth = 1; 4411 auth_skipped = 0; 4412 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, 4413 auth_offset)) { 4414 /* auth HMAC failed so dump it */ 4415 *offset = length; 4416 if (locked_tcb) { 4417 SCTP_TCB_UNLOCK(locked_tcb); 4418 } 4419 return (NULL); 4420 } else { 4421 /* remaining chunks are HMAC checked */ 4422 stcb->asoc.authenticated = 1; 4423 } 4424 } 4425 } 4426 if (stcb == NULL) { 4427 /* no association, so it's out of the blue... */ 4428 sctp_handle_ootb(m, iphlen, *offset, sh, inp, NULL, 4429 vrf_id, port); 4430 *offset = length; 4431 if (locked_tcb) { 4432 SCTP_TCB_UNLOCK(locked_tcb); 4433 } 4434 return (NULL); 4435 } 4436 asoc = &stcb->asoc; 4437 /* ABORT and SHUTDOWN can use either v_tag... */ 4438 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) || 4439 (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) || 4440 (ch->chunk_type == SCTP_PACKET_DROPPED)) { 4441 if ((vtag_in == asoc->my_vtag) || 4442 ((ch->chunk_flags & SCTP_HAD_NO_TCB) && 4443 (vtag_in == asoc->peer_vtag))) { 4444 /* this is valid */ 4445 } else { 4446 /* drop this packet... */ 4447 SCTP_STAT_INCR(sctps_badvtag); 4448 if (locked_tcb) { 4449 SCTP_TCB_UNLOCK(locked_tcb); 4450 } 4451 return (NULL); 4452 } 4453 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 4454 if (vtag_in != asoc->my_vtag) { 4455 /* 4456 * this could be a stale SHUTDOWN-ACK or the 4457 * peer never got the SHUTDOWN-COMPLETE and 4458 * is still hung; we have started a new asoc 4459 * but it won't complete until the shutdown 4460 * is completed 4461 */ 4462 if (locked_tcb) { 4463 SCTP_TCB_UNLOCK(locked_tcb); 4464 } 4465 sctp_handle_ootb(m, iphlen, *offset, sh, inp, 4466 NULL, vrf_id, port); 4467 return (NULL); 4468 } 4469 } else { 4470 /* for all other chunks, vtag must match */ 4471 if (vtag_in != asoc->my_vtag) { 4472 /* invalid vtag... */ 4473 SCTPDBG(SCTP_DEBUG_INPUT3, 4474 "invalid vtag: %xh, expect %xh\n", 4475 vtag_in, asoc->my_vtag); 4476 SCTP_STAT_INCR(sctps_badvtag); 4477 if (locked_tcb) { 4478 SCTP_TCB_UNLOCK(locked_tcb); 4479 } 4480 *offset = length; 4481 return (NULL); 4482 } 4483 } 4484 } /* end if !SCTP_COOKIE_ECHO */ 4485 /* 4486 * process all control chunks... 4487 */ 4488 if (((ch->chunk_type == SCTP_SELECTIVE_ACK) || 4489 /* EY */ 4490 (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) || 4491 (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) && 4492 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) { 4493 /* implied cookie-ack.. we must have lost the ack */ 4494 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4495 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4496 stcb->asoc.overall_error_count, 4497 0, 4498 SCTP_FROM_SCTP_INPUT, 4499 __LINE__); 4500 } 4501 stcb->asoc.overall_error_count = 0; 4502 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, 4503 *netp); 4504 } 4505 process_control_chunks: 4506 while (IS_SCTP_CONTROL(ch)) { 4507 /* validate chunk length */ 4508 chk_length = ntohs(ch->chunk_length); 4509 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n", 4510 ch->chunk_type, chk_length); 4511 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length); 4512 if (chk_length < sizeof(*ch) || 4513 (*offset + (int)chk_length) > length) { 4514 *offset = length; 4515 if (locked_tcb) { 4516 SCTP_TCB_UNLOCK(locked_tcb); 4517 } 4518 return (NULL); 4519 } 4520 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks); 4521 /* 4522 * INIT-ACK only gets the init ack "header" portion only 4523 * because we don't have to process the peer's COOKIE. All 4524 * others get a complete chunk. 4525 */ 4526 if ((ch->chunk_type == SCTP_INITIATION_ACK) || 4527 (ch->chunk_type == SCTP_INITIATION)) { 4528 /* get an init-ack chunk */ 4529 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4530 sizeof(struct sctp_init_ack_chunk), chunk_buf); 4531 if (ch == NULL) { 4532 *offset = length; 4533 if (locked_tcb) { 4534 SCTP_TCB_UNLOCK(locked_tcb); 4535 } 4536 return (NULL); 4537 } 4538 } else { 4539 /* For cookies and all other chunks. */ 4540 if (chk_length > sizeof(chunk_buf)) { 4541 /* 4542 * use just the size of the chunk buffer so 4543 * the front part of our chunks fit in 4544 * contiguous space up to the chunk buffer 4545 * size (508 bytes). For chunks that need to 4546 * get more than that they must use the 4547 * sctp_m_getptr() function or other means 4548 * (e.g. know how to parse mbuf chains). 4549 * Cookies do this already. 4550 */ 4551 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4552 (sizeof(chunk_buf) - 4), 4553 chunk_buf); 4554 if (ch == NULL) { 4555 *offset = length; 4556 if (locked_tcb) { 4557 SCTP_TCB_UNLOCK(locked_tcb); 4558 } 4559 return (NULL); 4560 } 4561 } else { 4562 /* We can fit it all */ 4563 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4564 chk_length, chunk_buf); 4565 if (ch == NULL) { 4566 SCTP_PRINTF("sctp_process_control: Can't get the all data....\n"); 4567 *offset = length; 4568 if (locked_tcb) { 4569 SCTP_TCB_UNLOCK(locked_tcb); 4570 } 4571 return (NULL); 4572 } 4573 } 4574 } 4575 num_chunks++; 4576 /* Save off the last place we got a control from */ 4577 if (stcb != NULL) { 4578 if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) { 4579 /* 4580 * allow last_control to be NULL if 4581 * ASCONF... ASCONF processing will find the 4582 * right net later 4583 */ 4584 if ((netp != NULL) && (*netp != NULL)) 4585 stcb->asoc.last_control_chunk_from = *netp; 4586 } 4587 } 4588 #ifdef SCTP_AUDITING_ENABLED 4589 sctp_audit_log(0xB0, ch->chunk_type); 4590 #endif 4591 4592 /* check to see if this chunk required auth, but isn't */ 4593 if ((stcb != NULL) && 4594 !SCTP_BASE_SYSCTL(sctp_auth_disable) && 4595 sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) && 4596 !stcb->asoc.authenticated) { 4597 /* "silently" ignore */ 4598 SCTP_STAT_INCR(sctps_recvauthmissing); 4599 goto next_chunk; 4600 } 4601 switch (ch->chunk_type) { 4602 case SCTP_INITIATION: 4603 /* must be first and only chunk */ 4604 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n"); 4605 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4606 /* We are not interested anymore? */ 4607 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4608 /* 4609 * collision case where we are 4610 * sending to them too 4611 */ 4612 ; 4613 } else { 4614 if (locked_tcb) { 4615 SCTP_TCB_UNLOCK(locked_tcb); 4616 } 4617 *offset = length; 4618 return (NULL); 4619 } 4620 } 4621 if ((chk_length > SCTP_LARGEST_INIT_ACCEPTED) || 4622 (num_chunks > 1) || 4623 (SCTP_BASE_SYSCTL(sctp_strict_init) && (length - *offset > (int)SCTP_SIZE32(chk_length)))) { 4624 *offset = length; 4625 if (locked_tcb) { 4626 SCTP_TCB_UNLOCK(locked_tcb); 4627 } 4628 return (NULL); 4629 } 4630 if ((stcb != NULL) && 4631 (SCTP_GET_STATE(&stcb->asoc) == 4632 SCTP_STATE_SHUTDOWN_ACK_SENT)) { 4633 sctp_send_shutdown_ack(stcb, 4634 stcb->asoc.primary_destination); 4635 *offset = length; 4636 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 4637 if (locked_tcb) { 4638 SCTP_TCB_UNLOCK(locked_tcb); 4639 } 4640 return (NULL); 4641 } 4642 if (netp) { 4643 sctp_handle_init(m, iphlen, *offset, sh, 4644 (struct sctp_init_chunk *)ch, inp, 4645 stcb, *netp, &abort_no_unlock, vrf_id, port); 4646 } 4647 if (abort_no_unlock) 4648 return (NULL); 4649 4650 *offset = length; 4651 if (locked_tcb) { 4652 SCTP_TCB_UNLOCK(locked_tcb); 4653 } 4654 return (NULL); 4655 break; 4656 case SCTP_PAD_CHUNK: 4657 break; 4658 case SCTP_INITIATION_ACK: 4659 /* must be first and only chunk */ 4660 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT-ACK\n"); 4661 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4662 /* We are not interested anymore */ 4663 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4664 ; 4665 } else { 4666 if (locked_tcb != stcb) { 4667 /* Very unlikely */ 4668 SCTP_TCB_UNLOCK(locked_tcb); 4669 } 4670 *offset = length; 4671 if (stcb) { 4672 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4673 so = SCTP_INP_SO(inp); 4674 atomic_add_int(&stcb->asoc.refcnt, 1); 4675 SCTP_TCB_UNLOCK(stcb); 4676 SCTP_SOCKET_LOCK(so, 1); 4677 SCTP_TCB_LOCK(stcb); 4678 atomic_subtract_int(&stcb->asoc.refcnt, 1); 4679 #endif 4680 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 4681 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4682 SCTP_SOCKET_UNLOCK(so, 1); 4683 #endif 4684 } 4685 return (NULL); 4686 } 4687 } 4688 if ((num_chunks > 1) || 4689 (SCTP_BASE_SYSCTL(sctp_strict_init) && (length - *offset > (int)SCTP_SIZE32(chk_length)))) { 4690 *offset = length; 4691 if (locked_tcb) { 4692 SCTP_TCB_UNLOCK(locked_tcb); 4693 } 4694 return (NULL); 4695 } 4696 if ((netp) && (*netp)) { 4697 ret = sctp_handle_init_ack(m, iphlen, *offset, sh, 4698 (struct sctp_init_ack_chunk *)ch, stcb, *netp, &abort_no_unlock, vrf_id); 4699 } else { 4700 ret = -1; 4701 } 4702 /* 4703 * Special case, I must call the output routine to 4704 * get the cookie echoed 4705 */ 4706 if (abort_no_unlock) 4707 return (NULL); 4708 4709 if ((stcb) && ret == 0) 4710 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 4711 *offset = length; 4712 if (locked_tcb) { 4713 SCTP_TCB_UNLOCK(locked_tcb); 4714 } 4715 return (NULL); 4716 break; 4717 case SCTP_SELECTIVE_ACK: 4718 { 4719 struct sctp_sack_chunk *sack; 4720 int abort_now = 0; 4721 uint32_t a_rwnd, cum_ack; 4722 uint16_t num_seg, num_dup; 4723 uint8_t flags; 4724 int offset_seg, offset_dup; 4725 4726 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK\n"); 4727 SCTP_STAT_INCR(sctps_recvsacks); 4728 if (stcb == NULL) { 4729 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing SACK chunk\n"); 4730 break; 4731 } 4732 if (chk_length < sizeof(struct sctp_sack_chunk)) { 4733 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n"); 4734 break; 4735 } 4736 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4737 /*- 4738 * If we have sent a shutdown-ack, we will pay no 4739 * attention to a sack sent in to us since 4740 * we don't care anymore. 4741 */ 4742 break; 4743 } 4744 sack = (struct sctp_sack_chunk *)ch; 4745 flags = ch->chunk_flags; 4746 cum_ack = ntohl(sack->sack.cum_tsn_ack); 4747 num_seg = ntohs(sack->sack.num_gap_ack_blks); 4748 num_dup = ntohs(sack->sack.num_dup_tsns); 4749 a_rwnd = (uint32_t) ntohl(sack->sack.a_rwnd); 4750 if (sizeof(struct sctp_sack_chunk) + 4751 num_seg * sizeof(struct sctp_gap_ack_block) + 4752 num_dup * sizeof(uint32_t) != chk_length) { 4753 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n"); 4754 break; 4755 } 4756 offset_seg = *offset + sizeof(struct sctp_sack_chunk); 4757 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 4758 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n", 4759 cum_ack, num_seg, a_rwnd); 4760 stcb->asoc.seen_a_sack_this_pkt = 1; 4761 if ((stcb->asoc.pr_sctp_cnt == 0) && 4762 (num_seg == 0) && 4763 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 4764 (stcb->asoc.saw_sack_with_frags == 0) && 4765 (stcb->asoc.saw_sack_with_nr_frags == 0) && 4766 (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) 4767 ) { 4768 /* 4769 * We have a SIMPLE sack having no 4770 * prior segments and data on sent 4771 * queue to be acked.. Use the 4772 * faster path sack processing. We 4773 * also allow window update sacks 4774 * with no missing segments to go 4775 * this way too. 4776 */ 4777 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, &abort_now, ecne_seen); 4778 } else { 4779 if (netp && *netp) 4780 sctp_handle_sack(m, offset_seg, offset_dup, 4781 stcb, *netp, 4782 num_seg, 0, num_dup, &abort_now, flags, 4783 cum_ack, a_rwnd, ecne_seen); 4784 } 4785 if (abort_now) { 4786 /* ABORT signal from sack processing */ 4787 *offset = length; 4788 return (NULL); 4789 } 4790 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 4791 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 4792 (stcb->asoc.stream_queue_cnt == 0)) { 4793 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 4794 } 4795 } 4796 break; 4797 /* 4798 * EY - nr_sack: If the received chunk is an 4799 * nr_sack chunk 4800 */ 4801 case SCTP_NR_SELECTIVE_ACK: 4802 { 4803 struct sctp_nr_sack_chunk *nr_sack; 4804 int abort_now = 0; 4805 uint32_t a_rwnd, cum_ack; 4806 uint16_t num_seg, num_nr_seg, num_dup; 4807 uint8_t flags; 4808 int offset_seg, offset_dup; 4809 4810 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK\n"); 4811 SCTP_STAT_INCR(sctps_recvsacks); 4812 if (stcb == NULL) { 4813 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing NR-SACK chunk\n"); 4814 break; 4815 } 4816 if ((stcb->asoc.sctp_nr_sack_on_off == 0) || 4817 (stcb->asoc.peer_supports_nr_sack == 0)) { 4818 goto unknown_chunk; 4819 } 4820 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) { 4821 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR-SACK chunk, too small\n"); 4822 break; 4823 } 4824 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4825 /*- 4826 * If we have sent a shutdown-ack, we will pay no 4827 * attention to a sack sent in to us since 4828 * we don't care anymore. 4829 */ 4830 break; 4831 } 4832 nr_sack = (struct sctp_nr_sack_chunk *)ch; 4833 flags = ch->chunk_flags; 4834 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack); 4835 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks); 4836 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks); 4837 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns); 4838 a_rwnd = (uint32_t) ntohl(nr_sack->nr_sack.a_rwnd); 4839 if (sizeof(struct sctp_nr_sack_chunk) + 4840 (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) + 4841 num_dup * sizeof(uint32_t) != chk_length) { 4842 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n"); 4843 break; 4844 } 4845 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk); 4846 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 4847 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n", 4848 cum_ack, num_seg, a_rwnd); 4849 stcb->asoc.seen_a_sack_this_pkt = 1; 4850 if ((stcb->asoc.pr_sctp_cnt == 0) && 4851 (num_seg == 0) && (num_nr_seg == 0) && 4852 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 4853 (stcb->asoc.saw_sack_with_frags == 0) && 4854 (stcb->asoc.saw_sack_with_nr_frags == 0) && 4855 (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) { 4856 /* 4857 * We have a SIMPLE sack having no 4858 * prior segments and data on sent 4859 * queue to be acked. Use the faster 4860 * path sack processing. We also 4861 * allow window update sacks with no 4862 * missing segments to go this way 4863 * too. 4864 */ 4865 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, 4866 &abort_now, ecne_seen); 4867 } else { 4868 if (netp && *netp) 4869 sctp_handle_sack(m, offset_seg, offset_dup, 4870 stcb, *netp, 4871 num_seg, num_nr_seg, num_dup, &abort_now, flags, 4872 cum_ack, a_rwnd, ecne_seen); 4873 } 4874 if (abort_now) { 4875 /* ABORT signal from sack processing */ 4876 *offset = length; 4877 return (NULL); 4878 } 4879 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 4880 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 4881 (stcb->asoc.stream_queue_cnt == 0)) { 4882 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 4883 } 4884 } 4885 break; 4886 4887 case SCTP_HEARTBEAT_REQUEST: 4888 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n"); 4889 if ((stcb) && netp && *netp) { 4890 SCTP_STAT_INCR(sctps_recvheartbeat); 4891 sctp_send_heartbeat_ack(stcb, m, *offset, 4892 chk_length, *netp); 4893 4894 /* He's alive so give him credit */ 4895 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4896 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4897 stcb->asoc.overall_error_count, 4898 0, 4899 SCTP_FROM_SCTP_INPUT, 4900 __LINE__); 4901 } 4902 stcb->asoc.overall_error_count = 0; 4903 } 4904 break; 4905 case SCTP_HEARTBEAT_ACK: 4906 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT-ACK\n"); 4907 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) { 4908 /* Its not ours */ 4909 *offset = length; 4910 if (locked_tcb) { 4911 SCTP_TCB_UNLOCK(locked_tcb); 4912 } 4913 return (NULL); 4914 } 4915 /* He's alive so give him credit */ 4916 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4917 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4918 stcb->asoc.overall_error_count, 4919 0, 4920 SCTP_FROM_SCTP_INPUT, 4921 __LINE__); 4922 } 4923 stcb->asoc.overall_error_count = 0; 4924 SCTP_STAT_INCR(sctps_recvheartbeatack); 4925 if (netp && *netp) 4926 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch, 4927 stcb, *netp); 4928 break; 4929 case SCTP_ABORT_ASSOCIATION: 4930 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n", 4931 stcb); 4932 if ((stcb) && netp && *netp) 4933 sctp_handle_abort((struct sctp_abort_chunk *)ch, 4934 stcb, *netp); 4935 *offset = length; 4936 return (NULL); 4937 break; 4938 case SCTP_SHUTDOWN: 4939 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n", 4940 stcb); 4941 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) { 4942 *offset = length; 4943 if (locked_tcb) { 4944 SCTP_TCB_UNLOCK(locked_tcb); 4945 } 4946 return (NULL); 4947 } 4948 if (netp && *netp) { 4949 int abort_flag = 0; 4950 4951 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch, 4952 stcb, *netp, &abort_flag); 4953 if (abort_flag) { 4954 *offset = length; 4955 return (NULL); 4956 } 4957 } 4958 break; 4959 case SCTP_SHUTDOWN_ACK: 4960 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-ACK, stcb %p\n", stcb); 4961 if ((stcb) && (netp) && (*netp)) 4962 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp); 4963 *offset = length; 4964 return (NULL); 4965 break; 4966 4967 case SCTP_OPERATION_ERROR: 4968 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP-ERR\n"); 4969 if ((stcb) && netp && *netp && sctp_handle_error(ch, stcb, *netp) < 0) { 4970 4971 *offset = length; 4972 return (NULL); 4973 } 4974 break; 4975 case SCTP_COOKIE_ECHO: 4976 SCTPDBG(SCTP_DEBUG_INPUT3, 4977 "SCTP_COOKIE-ECHO, stcb %p\n", stcb); 4978 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4979 ; 4980 } else { 4981 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4982 /* We are not interested anymore */ 4983 abend: 4984 if (stcb) { 4985 SCTP_TCB_UNLOCK(stcb); 4986 } 4987 *offset = length; 4988 return (NULL); 4989 } 4990 } 4991 /* 4992 * First are we accepting? We do this again here 4993 * since it is possible that a previous endpoint WAS 4994 * listening responded to a INIT-ACK and then 4995 * closed. We opened and bound.. and are now no 4996 * longer listening. 4997 */ 4998 4999 if ((stcb == NULL) && (inp->sctp_socket->so_qlen >= inp->sctp_socket->so_qlimit)) { 5000 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 5001 (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) { 5002 struct mbuf *oper; 5003 struct sctp_paramhdr *phdr; 5004 5005 oper = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 5006 0, M_DONTWAIT, 1, MT_DATA); 5007 if (oper) { 5008 SCTP_BUF_LEN(oper) = 5009 sizeof(struct sctp_paramhdr); 5010 phdr = mtod(oper, 5011 struct sctp_paramhdr *); 5012 phdr->param_type = 5013 htons(SCTP_CAUSE_OUT_OF_RESC); 5014 phdr->param_length = 5015 htons(sizeof(struct sctp_paramhdr)); 5016 } 5017 sctp_abort_association(inp, stcb, m, 5018 iphlen, sh, oper, vrf_id, port); 5019 } 5020 *offset = length; 5021 return (NULL); 5022 } else { 5023 struct mbuf *ret_buf; 5024 struct sctp_inpcb *linp; 5025 5026 if (stcb) { 5027 linp = NULL; 5028 } else { 5029 linp = inp; 5030 } 5031 5032 if (linp) { 5033 SCTP_ASOC_CREATE_LOCK(linp); 5034 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 5035 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) { 5036 SCTP_ASOC_CREATE_UNLOCK(linp); 5037 goto abend; 5038 } 5039 } 5040 if (netp) { 5041 ret_buf = 5042 sctp_handle_cookie_echo(m, iphlen, 5043 *offset, sh, 5044 (struct sctp_cookie_echo_chunk *)ch, 5045 &inp, &stcb, netp, 5046 auth_skipped, 5047 auth_offset, 5048 auth_len, 5049 &locked_tcb, 5050 vrf_id, 5051 port); 5052 } else { 5053 ret_buf = NULL; 5054 } 5055 if (linp) { 5056 SCTP_ASOC_CREATE_UNLOCK(linp); 5057 } 5058 if (ret_buf == NULL) { 5059 if (locked_tcb) { 5060 SCTP_TCB_UNLOCK(locked_tcb); 5061 } 5062 SCTPDBG(SCTP_DEBUG_INPUT3, 5063 "GAK, null buffer\n"); 5064 auth_skipped = 0; 5065 *offset = length; 5066 return (NULL); 5067 } 5068 /* if AUTH skipped, see if it verified... */ 5069 if (auth_skipped) { 5070 got_auth = 1; 5071 auth_skipped = 0; 5072 } 5073 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) { 5074 /* 5075 * Restart the timer if we have 5076 * pending data 5077 */ 5078 struct sctp_tmit_chunk *chk; 5079 5080 chk = TAILQ_FIRST(&stcb->asoc.sent_queue); 5081 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 5082 } 5083 } 5084 break; 5085 case SCTP_COOKIE_ACK: 5086 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE-ACK, stcb %p\n", stcb); 5087 if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) { 5088 if (locked_tcb) { 5089 SCTP_TCB_UNLOCK(locked_tcb); 5090 } 5091 return (NULL); 5092 } 5093 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5094 /* We are not interested anymore */ 5095 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 5096 ; 5097 } else if (stcb) { 5098 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5099 so = SCTP_INP_SO(inp); 5100 atomic_add_int(&stcb->asoc.refcnt, 1); 5101 SCTP_TCB_UNLOCK(stcb); 5102 SCTP_SOCKET_LOCK(so, 1); 5103 SCTP_TCB_LOCK(stcb); 5104 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5105 #endif 5106 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 5107 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5108 SCTP_SOCKET_UNLOCK(so, 1); 5109 #endif 5110 *offset = length; 5111 return (NULL); 5112 } 5113 } 5114 /* He's alive so give him credit */ 5115 if ((stcb) && netp && *netp) { 5116 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5117 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5118 stcb->asoc.overall_error_count, 5119 0, 5120 SCTP_FROM_SCTP_INPUT, 5121 __LINE__); 5122 } 5123 stcb->asoc.overall_error_count = 0; 5124 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp); 5125 } 5126 break; 5127 case SCTP_ECN_ECHO: 5128 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-ECHO\n"); 5129 /* He's alive so give him credit */ 5130 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) { 5131 /* Its not ours */ 5132 if (locked_tcb) { 5133 SCTP_TCB_UNLOCK(locked_tcb); 5134 } 5135 *offset = length; 5136 return (NULL); 5137 } 5138 if (stcb) { 5139 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5140 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5141 stcb->asoc.overall_error_count, 5142 0, 5143 SCTP_FROM_SCTP_INPUT, 5144 __LINE__); 5145 } 5146 stcb->asoc.overall_error_count = 0; 5147 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, 5148 stcb); 5149 ecne_seen = 1; 5150 } 5151 break; 5152 case SCTP_ECN_CWR: 5153 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-CWR\n"); 5154 /* He's alive so give him credit */ 5155 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) { 5156 /* Its not ours */ 5157 if (locked_tcb) { 5158 SCTP_TCB_UNLOCK(locked_tcb); 5159 } 5160 *offset = length; 5161 return (NULL); 5162 } 5163 if (stcb) { 5164 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5165 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5166 stcb->asoc.overall_error_count, 5167 0, 5168 SCTP_FROM_SCTP_INPUT, 5169 __LINE__); 5170 } 5171 stcb->asoc.overall_error_count = 0; 5172 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp); 5173 } 5174 break; 5175 case SCTP_SHUTDOWN_COMPLETE: 5176 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-COMPLETE, stcb %p\n", stcb); 5177 /* must be first and only chunk */ 5178 if ((num_chunks > 1) || 5179 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 5180 *offset = length; 5181 if (locked_tcb) { 5182 SCTP_TCB_UNLOCK(locked_tcb); 5183 } 5184 return (NULL); 5185 } 5186 if ((stcb) && netp && *netp) { 5187 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch, 5188 stcb, *netp); 5189 } 5190 *offset = length; 5191 return (NULL); 5192 break; 5193 case SCTP_ASCONF: 5194 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n"); 5195 /* He's alive so give him credit */ 5196 if (stcb) { 5197 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5198 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5199 stcb->asoc.overall_error_count, 5200 0, 5201 SCTP_FROM_SCTP_INPUT, 5202 __LINE__); 5203 } 5204 stcb->asoc.overall_error_count = 0; 5205 sctp_handle_asconf(m, *offset, 5206 (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0); 5207 asconf_cnt++; 5208 } 5209 break; 5210 case SCTP_ASCONF_ACK: 5211 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF-ACK\n"); 5212 if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) { 5213 /* Its not ours */ 5214 if (locked_tcb) { 5215 SCTP_TCB_UNLOCK(locked_tcb); 5216 } 5217 *offset = length; 5218 return (NULL); 5219 } 5220 if ((stcb) && netp && *netp) { 5221 /* He's alive so give him credit */ 5222 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5223 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5224 stcb->asoc.overall_error_count, 5225 0, 5226 SCTP_FROM_SCTP_INPUT, 5227 __LINE__); 5228 } 5229 stcb->asoc.overall_error_count = 0; 5230 sctp_handle_asconf_ack(m, *offset, 5231 (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock); 5232 if (abort_no_unlock) 5233 return (NULL); 5234 } 5235 break; 5236 case SCTP_FORWARD_CUM_TSN: 5237 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD-TSN\n"); 5238 if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) { 5239 /* Its not ours */ 5240 if (locked_tcb) { 5241 SCTP_TCB_UNLOCK(locked_tcb); 5242 } 5243 *offset = length; 5244 return (NULL); 5245 } 5246 /* He's alive so give him credit */ 5247 if (stcb) { 5248 int abort_flag = 0; 5249 5250 stcb->asoc.overall_error_count = 0; 5251 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5252 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5253 stcb->asoc.overall_error_count, 5254 0, 5255 SCTP_FROM_SCTP_INPUT, 5256 __LINE__); 5257 } 5258 *fwd_tsn_seen = 1; 5259 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5260 /* We are not interested anymore */ 5261 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5262 so = SCTP_INP_SO(inp); 5263 atomic_add_int(&stcb->asoc.refcnt, 1); 5264 SCTP_TCB_UNLOCK(stcb); 5265 SCTP_SOCKET_LOCK(so, 1); 5266 SCTP_TCB_LOCK(stcb); 5267 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5268 #endif 5269 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_29); 5270 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5271 SCTP_SOCKET_UNLOCK(so, 1); 5272 #endif 5273 *offset = length; 5274 return (NULL); 5275 } 5276 sctp_handle_forward_tsn(stcb, 5277 (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset); 5278 if (abort_flag) { 5279 *offset = length; 5280 return (NULL); 5281 } else { 5282 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5283 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5284 stcb->asoc.overall_error_count, 5285 0, 5286 SCTP_FROM_SCTP_INPUT, 5287 __LINE__); 5288 } 5289 stcb->asoc.overall_error_count = 0; 5290 } 5291 5292 } 5293 break; 5294 case SCTP_STREAM_RESET: 5295 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n"); 5296 if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) { 5297 /* Its not ours */ 5298 if (locked_tcb) { 5299 SCTP_TCB_UNLOCK(locked_tcb); 5300 } 5301 *offset = length; 5302 return (NULL); 5303 } 5304 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5305 /* We are not interested anymore */ 5306 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5307 so = SCTP_INP_SO(inp); 5308 atomic_add_int(&stcb->asoc.refcnt, 1); 5309 SCTP_TCB_UNLOCK(stcb); 5310 SCTP_SOCKET_LOCK(so, 1); 5311 SCTP_TCB_LOCK(stcb); 5312 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5313 #endif 5314 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_30); 5315 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5316 SCTP_SOCKET_UNLOCK(so, 1); 5317 #endif 5318 *offset = length; 5319 return (NULL); 5320 } 5321 if (stcb->asoc.peer_supports_strreset == 0) { 5322 /* 5323 * hmm, peer should have announced this, but 5324 * we will turn it on since he is sending us 5325 * a stream reset. 5326 */ 5327 stcb->asoc.peer_supports_strreset = 1; 5328 } 5329 if (sctp_handle_stream_reset(stcb, m, *offset, (struct sctp_stream_reset_out_req *)ch)) { 5330 /* stop processing */ 5331 *offset = length; 5332 return (NULL); 5333 } 5334 break; 5335 case SCTP_PACKET_DROPPED: 5336 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n"); 5337 /* re-get it all please */ 5338 if (chk_length < sizeof(struct sctp_pktdrop_chunk)) { 5339 /* Its not ours */ 5340 if (locked_tcb) { 5341 SCTP_TCB_UNLOCK(locked_tcb); 5342 } 5343 *offset = length; 5344 return (NULL); 5345 } 5346 if (ch && (stcb) && netp && (*netp)) { 5347 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch, 5348 stcb, *netp, 5349 min(chk_length, (sizeof(chunk_buf) - 4))); 5350 5351 } 5352 break; 5353 5354 case SCTP_AUTHENTICATION: 5355 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n"); 5356 if (SCTP_BASE_SYSCTL(sctp_auth_disable)) 5357 goto unknown_chunk; 5358 5359 if (stcb == NULL) { 5360 /* save the first AUTH for later processing */ 5361 if (auth_skipped == 0) { 5362 auth_offset = *offset; 5363 auth_len = chk_length; 5364 auth_skipped = 1; 5365 } 5366 /* skip this chunk (temporarily) */ 5367 goto next_chunk; 5368 } 5369 if ((chk_length < (sizeof(struct sctp_auth_chunk))) || 5370 (chk_length > (sizeof(struct sctp_auth_chunk) + 5371 SCTP_AUTH_DIGEST_LEN_MAX))) { 5372 /* Its not ours */ 5373 if (locked_tcb) { 5374 SCTP_TCB_UNLOCK(locked_tcb); 5375 } 5376 *offset = length; 5377 return (NULL); 5378 } 5379 if (got_auth == 1) { 5380 /* skip this chunk... it's already auth'd */ 5381 goto next_chunk; 5382 } 5383 got_auth = 1; 5384 if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch, 5385 m, *offset)) { 5386 /* auth HMAC failed so dump the packet */ 5387 *offset = length; 5388 return (stcb); 5389 } else { 5390 /* remaining chunks are HMAC checked */ 5391 stcb->asoc.authenticated = 1; 5392 } 5393 break; 5394 5395 default: 5396 unknown_chunk: 5397 /* it's an unknown chunk! */ 5398 if ((ch->chunk_type & 0x40) && (stcb != NULL)) { 5399 struct mbuf *mm; 5400 struct sctp_paramhdr *phd; 5401 5402 mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 5403 0, M_DONTWAIT, 1, MT_DATA); 5404 if (mm) { 5405 phd = mtod(mm, struct sctp_paramhdr *); 5406 /* 5407 * We cheat and use param type since 5408 * we did not bother to define a 5409 * error cause struct. They are the 5410 * same basic format with different 5411 * names. 5412 */ 5413 phd->param_type = htons(SCTP_CAUSE_UNRECOG_CHUNK); 5414 phd->param_length = htons(chk_length + sizeof(*phd)); 5415 SCTP_BUF_LEN(mm) = sizeof(*phd); 5416 SCTP_BUF_NEXT(mm) = SCTP_M_COPYM(m, *offset, SCTP_SIZE32(chk_length), 5417 M_DONTWAIT); 5418 if (SCTP_BUF_NEXT(mm)) { 5419 #ifdef SCTP_MBUF_LOGGING 5420 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5421 struct mbuf *mat; 5422 5423 mat = SCTP_BUF_NEXT(mm); 5424 while (mat) { 5425 if (SCTP_BUF_IS_EXTENDED(mat)) { 5426 sctp_log_mb(mat, SCTP_MBUF_ICOPY); 5427 } 5428 mat = SCTP_BUF_NEXT(mat); 5429 } 5430 } 5431 #endif 5432 sctp_queue_op_err(stcb, mm); 5433 } else { 5434 sctp_m_freem(mm); 5435 } 5436 } 5437 } 5438 if ((ch->chunk_type & 0x80) == 0) { 5439 /* discard this packet */ 5440 *offset = length; 5441 return (stcb); 5442 } /* else skip this bad chunk and continue... */ 5443 break; 5444 } /* switch (ch->chunk_type) */ 5445 5446 5447 next_chunk: 5448 /* get the next chunk */ 5449 *offset += SCTP_SIZE32(chk_length); 5450 if (*offset >= length) { 5451 /* no more data left in the mbuf chain */ 5452 break; 5453 } 5454 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 5455 sizeof(struct sctp_chunkhdr), chunk_buf); 5456 if (ch == NULL) { 5457 if (locked_tcb) { 5458 SCTP_TCB_UNLOCK(locked_tcb); 5459 } 5460 *offset = length; 5461 return (NULL); 5462 } 5463 } /* while */ 5464 5465 if (asconf_cnt > 0 && stcb != NULL) { 5466 sctp_send_asconf_ack(stcb); 5467 } 5468 return (stcb); 5469 } 5470 5471 5472 #ifdef INVARIANTS 5473 #ifdef __GNUC__ 5474 __attribute__((noinline)) 5475 #endif 5476 void 5477 sctp_validate_no_locks(struct sctp_inpcb *inp) 5478 { 5479 struct sctp_tcb *lstcb; 5480 5481 LIST_FOREACH(lstcb, &inp->sctp_asoc_list, sctp_tcblist) { 5482 if (mtx_owned(&lstcb->tcb_mtx)) { 5483 panic("Own lock on stcb at return from input"); 5484 } 5485 } 5486 if (mtx_owned(&inp->inp_create_mtx)) { 5487 panic("Own create lock on inp"); 5488 } 5489 if (mtx_owned(&inp->inp_mtx)) { 5490 panic("Own inp lock on inp"); 5491 } 5492 } 5493 5494 #endif 5495 5496 /* 5497 * common input chunk processing (v4 and v6) 5498 */ 5499 void 5500 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, 5501 int length, struct sctphdr *sh, struct sctp_chunkhdr *ch, 5502 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets *net, 5503 uint8_t ecn_bits, uint32_t vrf_id, uint16_t port) 5504 { 5505 /* 5506 * Control chunk processing 5507 */ 5508 uint32_t high_tsn; 5509 int fwd_tsn_seen = 0, data_processed = 0; 5510 struct mbuf *m = *mm; 5511 int abort_flag = 0; 5512 int un_sent; 5513 int cnt_ctrl_ready = 0; 5514 5515 SCTP_STAT_INCR(sctps_recvdatagrams); 5516 #ifdef SCTP_AUDITING_ENABLED 5517 sctp_audit_log(0xE0, 1); 5518 sctp_auditing(0, inp, stcb, net); 5519 #endif 5520 5521 SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n", 5522 m, iphlen, offset, length, stcb); 5523 if (stcb) { 5524 /* always clear this before beginning a packet */ 5525 stcb->asoc.authenticated = 0; 5526 stcb->asoc.seen_a_sack_this_pkt = 0; 5527 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n", 5528 stcb, stcb->asoc.state); 5529 5530 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) || 5531 (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) { 5532 /*- 5533 * If we hit here, we had a ref count 5534 * up when the assoc was aborted and the 5535 * timer is clearing out the assoc, we should 5536 * NOT respond to any packet.. its OOTB. 5537 */ 5538 SCTP_TCB_UNLOCK(stcb); 5539 sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL, 5540 vrf_id, port); 5541 goto out_now; 5542 } 5543 } 5544 if (IS_SCTP_CONTROL(ch)) { 5545 /* process the control portion of the SCTP packet */ 5546 /* sa_ignore NO_NULL_CHK */ 5547 stcb = sctp_process_control(m, iphlen, &offset, length, sh, ch, 5548 inp, stcb, &net, &fwd_tsn_seen, vrf_id, port); 5549 if (stcb) { 5550 /* 5551 * This covers us if the cookie-echo was there and 5552 * it changes our INP. 5553 */ 5554 inp = stcb->sctp_ep; 5555 if ((net) && (port)) { 5556 if (net->port == 0) { 5557 sctp_pathmtu_adjustment(inp, stcb, net, net->mtu - sizeof(struct udphdr)); 5558 } 5559 net->port = port; 5560 } 5561 } 5562 } else { 5563 /* 5564 * no control chunks, so pre-process DATA chunks (these 5565 * checks are taken care of by control processing) 5566 */ 5567 5568 /* 5569 * if DATA only packet, and auth is required, then punt... 5570 * can't have authenticated without any AUTH (control) 5571 * chunks 5572 */ 5573 if ((stcb != NULL) && 5574 !SCTP_BASE_SYSCTL(sctp_auth_disable) && 5575 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) { 5576 /* "silently" ignore */ 5577 SCTP_STAT_INCR(sctps_recvauthmissing); 5578 SCTP_TCB_UNLOCK(stcb); 5579 goto out_now; 5580 } 5581 if (stcb == NULL) { 5582 /* out of the blue DATA chunk */ 5583 sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL, 5584 vrf_id, port); 5585 goto out_now; 5586 } 5587 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) { 5588 /* v_tag mismatch! */ 5589 SCTP_STAT_INCR(sctps_badvtag); 5590 SCTP_TCB_UNLOCK(stcb); 5591 goto out_now; 5592 } 5593 } 5594 5595 if (stcb == NULL) { 5596 /* 5597 * no valid TCB for this packet, or we found it's a bad 5598 * packet while processing control, or we're done with this 5599 * packet (done or skip rest of data), so we drop it... 5600 */ 5601 goto out_now; 5602 } 5603 /* 5604 * DATA chunk processing 5605 */ 5606 /* plow through the data chunks while length > offset */ 5607 5608 /* 5609 * Rest should be DATA only. Check authentication state if AUTH for 5610 * DATA is required. 5611 */ 5612 if ((length > offset) && 5613 (stcb != NULL) && 5614 !SCTP_BASE_SYSCTL(sctp_auth_disable) && 5615 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) && 5616 !stcb->asoc.authenticated) { 5617 /* "silently" ignore */ 5618 SCTP_STAT_INCR(sctps_recvauthmissing); 5619 SCTPDBG(SCTP_DEBUG_AUTH1, 5620 "Data chunk requires AUTH, skipped\n"); 5621 goto trigger_send; 5622 } 5623 if (length > offset) { 5624 int retval; 5625 5626 /* 5627 * First check to make sure our state is correct. We would 5628 * not get here unless we really did have a tag, so we don't 5629 * abort if this happens, just dump the chunk silently. 5630 */ 5631 switch (SCTP_GET_STATE(&stcb->asoc)) { 5632 case SCTP_STATE_COOKIE_ECHOED: 5633 /* 5634 * we consider data with valid tags in this state 5635 * shows us the cookie-ack was lost. Imply it was 5636 * there. 5637 */ 5638 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5639 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5640 stcb->asoc.overall_error_count, 5641 0, 5642 SCTP_FROM_SCTP_INPUT, 5643 __LINE__); 5644 } 5645 stcb->asoc.overall_error_count = 0; 5646 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net); 5647 break; 5648 case SCTP_STATE_COOKIE_WAIT: 5649 /* 5650 * We consider OOTB any data sent during asoc setup. 5651 */ 5652 sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL, 5653 vrf_id, port); 5654 SCTP_TCB_UNLOCK(stcb); 5655 goto out_now; 5656 /* sa_ignore NOTREACHED */ 5657 break; 5658 case SCTP_STATE_EMPTY: /* should not happen */ 5659 case SCTP_STATE_INUSE: /* should not happen */ 5660 case SCTP_STATE_SHUTDOWN_RECEIVED: /* This is a peer error */ 5661 case SCTP_STATE_SHUTDOWN_ACK_SENT: 5662 default: 5663 SCTP_TCB_UNLOCK(stcb); 5664 goto out_now; 5665 /* sa_ignore NOTREACHED */ 5666 break; 5667 case SCTP_STATE_OPEN: 5668 case SCTP_STATE_SHUTDOWN_SENT: 5669 break; 5670 } 5671 /* plow through the data chunks while length > offset */ 5672 retval = sctp_process_data(mm, iphlen, &offset, length, sh, 5673 inp, stcb, net, &high_tsn); 5674 if (retval == 2) { 5675 /* 5676 * The association aborted, NO UNLOCK needed since 5677 * the association is destroyed. 5678 */ 5679 goto out_now; 5680 } 5681 data_processed = 1; 5682 /* 5683 * Anything important needs to have been m_copy'ed in 5684 * process_data 5685 */ 5686 } 5687 /* take care of ecn */ 5688 if ((stcb->asoc.ecn_allowed == 1) && 5689 ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) { 5690 /* Yep, we need to add a ECNE */ 5691 sctp_send_ecn_echo(stcb, net, high_tsn); 5692 } 5693 if ((data_processed == 0) && (fwd_tsn_seen)) { 5694 int was_a_gap; 5695 uint32_t highest_tsn; 5696 5697 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) { 5698 highest_tsn = stcb->asoc.highest_tsn_inside_nr_map; 5699 } else { 5700 highest_tsn = stcb->asoc.highest_tsn_inside_map; 5701 } 5702 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn); 5703 stcb->asoc.send_sack = 1; 5704 sctp_sack_check(stcb, was_a_gap, &abort_flag); 5705 if (abort_flag) { 5706 /* Again, we aborted so NO UNLOCK needed */ 5707 goto out_now; 5708 } 5709 } else if (fwd_tsn_seen) { 5710 stcb->asoc.send_sack = 1; 5711 } 5712 /* trigger send of any chunks in queue... */ 5713 trigger_send: 5714 #ifdef SCTP_AUDITING_ENABLED 5715 sctp_audit_log(0xE0, 2); 5716 sctp_auditing(1, inp, stcb, net); 5717 #endif 5718 SCTPDBG(SCTP_DEBUG_INPUT1, 5719 "Check for chunk output prw:%d tqe:%d tf=%d\n", 5720 stcb->asoc.peers_rwnd, 5721 TAILQ_EMPTY(&stcb->asoc.control_send_queue), 5722 stcb->asoc.total_flight); 5723 un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight); 5724 if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 5725 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq; 5726 } 5727 if (cnt_ctrl_ready || 5728 ((un_sent) && 5729 (stcb->asoc.peers_rwnd > 0 || 5730 (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) { 5731 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n"); 5732 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 5733 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n"); 5734 } 5735 #ifdef SCTP_AUDITING_ENABLED 5736 sctp_audit_log(0xE0, 3); 5737 sctp_auditing(2, inp, stcb, net); 5738 #endif 5739 SCTP_TCB_UNLOCK(stcb); 5740 out_now: 5741 #ifdef INVARIANTS 5742 sctp_validate_no_locks(inp); 5743 #endif 5744 return; 5745 } 5746 5747 #if 0 5748 static void 5749 sctp_print_mbuf_chain(struct mbuf *m) 5750 { 5751 for (; m; m = SCTP_BUF_NEXT(m)) { 5752 printf("%p: m_len = %ld\n", m, SCTP_BUF_LEN(m)); 5753 if (SCTP_BUF_IS_EXTENDED(m)) 5754 printf("%p: extend_size = %d\n", m, SCTP_BUF_EXTEND_SIZE(m)); 5755 } 5756 } 5757 5758 #endif 5759 5760 #ifdef INET 5761 void 5762 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port) 5763 { 5764 #ifdef SCTP_MBUF_LOGGING 5765 struct mbuf *mat; 5766 5767 #endif 5768 struct mbuf *m; 5769 int iphlen; 5770 uint32_t vrf_id = 0; 5771 uint8_t ecn_bits; 5772 struct ip *ip; 5773 struct sctphdr *sh; 5774 struct sctp_inpcb *inp = NULL; 5775 struct sctp_nets *net; 5776 struct sctp_tcb *stcb = NULL; 5777 struct sctp_chunkhdr *ch; 5778 int refcount_up = 0; 5779 int length, mlen, offset; 5780 5781 #if !defined(SCTP_WITH_NO_CSUM) 5782 uint32_t check, calc_check; 5783 5784 #endif 5785 5786 if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) { 5787 SCTP_RELEASE_PKT(i_pak); 5788 return; 5789 } 5790 mlen = SCTP_HEADER_LEN(i_pak); 5791 iphlen = off; 5792 m = SCTP_HEADER_TO_CHAIN(i_pak); 5793 5794 net = NULL; 5795 SCTP_STAT_INCR(sctps_recvpackets); 5796 SCTP_STAT_INCR_COUNTER64(sctps_inpackets); 5797 5798 5799 #ifdef SCTP_MBUF_LOGGING 5800 /* Log in any input mbufs */ 5801 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5802 mat = m; 5803 while (mat) { 5804 if (SCTP_BUF_IS_EXTENDED(mat)) { 5805 sctp_log_mb(mat, SCTP_MBUF_INPUT); 5806 } 5807 mat = SCTP_BUF_NEXT(mat); 5808 } 5809 } 5810 #endif 5811 #ifdef SCTP_PACKET_LOGGING 5812 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) 5813 sctp_packet_log(m, mlen); 5814 #endif 5815 /* 5816 * Must take out the iphlen, since mlen expects this (only effect lb 5817 * case) 5818 */ 5819 mlen -= iphlen; 5820 5821 /* 5822 * Get IP, SCTP, and first chunk header together in first mbuf. 5823 */ 5824 ip = mtod(m, struct ip *); 5825 offset = iphlen + sizeof(*sh) + sizeof(*ch); 5826 if (SCTP_BUF_LEN(m) < offset) { 5827 if ((m = m_pullup(m, offset)) == 0) { 5828 SCTP_STAT_INCR(sctps_hdrops); 5829 return; 5830 } 5831 ip = mtod(m, struct ip *); 5832 } 5833 /* validate mbuf chain length with IP payload length */ 5834 if (mlen < (SCTP_GET_IPV4_LENGTH(ip) - iphlen)) { 5835 SCTP_STAT_INCR(sctps_hdrops); 5836 goto bad; 5837 } 5838 sh = (struct sctphdr *)((caddr_t)ip + iphlen); 5839 ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(*sh)); 5840 SCTPDBG(SCTP_DEBUG_INPUT1, 5841 "sctp_input() length:%d iphlen:%d\n", mlen, iphlen); 5842 5843 /* SCTP does not allow broadcasts or multicasts */ 5844 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) { 5845 goto bad; 5846 } 5847 if (SCTP_IS_IT_BROADCAST(ip->ip_dst, m)) { 5848 /* 5849 * We only look at broadcast if its a front state, All 5850 * others we will not have a tcb for anyway. 5851 */ 5852 goto bad; 5853 } 5854 /* validate SCTP checksum */ 5855 SCTPDBG(SCTP_DEBUG_CRCOFFLOAD, 5856 "sctp_input(): Packet of length %d received on %s with csum_flags 0x%x.\n", 5857 m->m_pkthdr.len, 5858 if_name(m->m_pkthdr.rcvif), 5859 m->m_pkthdr.csum_flags); 5860 #if defined(SCTP_WITH_NO_CSUM) 5861 SCTP_STAT_INCR(sctps_recvnocrc); 5862 #else 5863 if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) { 5864 SCTP_STAT_INCR(sctps_recvhwcrc); 5865 goto sctp_skip_csum_4; 5866 } 5867 check = sh->checksum; /* save incoming checksum */ 5868 sh->checksum = 0; /* prepare for calc */ 5869 calc_check = sctp_calculate_cksum(m, iphlen); 5870 sh->checksum = check; 5871 SCTP_STAT_INCR(sctps_recvswcrc); 5872 if (calc_check != check) { 5873 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x m:%p mlen:%d iphlen:%d\n", 5874 calc_check, check, m, mlen, iphlen); 5875 5876 stcb = sctp_findassociation_addr(m, iphlen, 5877 offset - sizeof(*ch), 5878 sh, ch, &inp, &net, 5879 vrf_id); 5880 if ((net) && (port)) { 5881 if (net->port == 0) { 5882 sctp_pathmtu_adjustment(inp, stcb, net, net->mtu - sizeof(struct udphdr)); 5883 } 5884 net->port = port; 5885 } 5886 if ((net != NULL) && (m->m_flags & M_FLOWID)) { 5887 net->flowid = m->m_pkthdr.flowid; 5888 #ifdef INVARIANTS 5889 net->flowidset = 1; 5890 #endif 5891 } 5892 if ((inp) && (stcb)) { 5893 sctp_send_packet_dropped(stcb, net, m, iphlen, 1); 5894 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED); 5895 } else if ((inp != NULL) && (stcb == NULL)) { 5896 refcount_up = 1; 5897 } 5898 SCTP_STAT_INCR(sctps_badsum); 5899 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors); 5900 goto bad; 5901 } 5902 sctp_skip_csum_4: 5903 #endif 5904 /* destination port of 0 is illegal, based on RFC2960. */ 5905 if (sh->dest_port == 0) { 5906 SCTP_STAT_INCR(sctps_hdrops); 5907 goto bad; 5908 } 5909 /* 5910 * Locate pcb and tcb for datagram sctp_findassociation_addr() wants 5911 * IP/SCTP/first chunk header... 5912 */ 5913 stcb = sctp_findassociation_addr(m, iphlen, offset - sizeof(*ch), 5914 sh, ch, &inp, &net, vrf_id); 5915 if ((net) && (port)) { 5916 if (net->port == 0) { 5917 sctp_pathmtu_adjustment(inp, stcb, net, net->mtu - sizeof(struct udphdr)); 5918 } 5919 net->port = port; 5920 } 5921 if ((net != NULL) && (m->m_flags & M_FLOWID)) { 5922 net->flowid = m->m_pkthdr.flowid; 5923 #ifdef INVARIANTS 5924 net->flowidset = 1; 5925 #endif 5926 } 5927 /* inp's ref-count increased && stcb locked */ 5928 if (inp == NULL) { 5929 struct sctp_init_chunk *init_chk, chunk_buf; 5930 5931 SCTP_STAT_INCR(sctps_noport); 5932 #ifdef ICMP_BANDLIM 5933 /* 5934 * we use the bandwidth limiting to protect against sending 5935 * too many ABORTS all at once. In this case these count the 5936 * same as an ICMP message. 5937 */ 5938 if (badport_bandlim(0) < 0) 5939 goto bad; 5940 #endif /* ICMP_BANDLIM */ 5941 SCTPDBG(SCTP_DEBUG_INPUT1, 5942 "Sending a ABORT from packet entry!\n"); 5943 if (ch->chunk_type == SCTP_INITIATION) { 5944 /* 5945 * we do a trick here to get the INIT tag, dig in 5946 * and get the tag from the INIT and put it in the 5947 * common header. 5948 */ 5949 init_chk = (struct sctp_init_chunk *)sctp_m_getptr(m, 5950 iphlen + sizeof(*sh), sizeof(*init_chk), 5951 (uint8_t *) & chunk_buf); 5952 if (init_chk != NULL) 5953 sh->v_tag = init_chk->init.initiate_tag; 5954 } 5955 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 5956 sctp_send_shutdown_complete2(m, iphlen, sh, vrf_id, port); 5957 goto bad; 5958 } 5959 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) { 5960 goto bad; 5961 } 5962 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) 5963 sctp_send_abort(m, iphlen, sh, 0, NULL, vrf_id, port); 5964 goto bad; 5965 } else if (stcb == NULL) { 5966 refcount_up = 1; 5967 } 5968 #ifdef IPSEC 5969 /* 5970 * I very much doubt any of the IPSEC stuff will work but I have no 5971 * idea, so I will leave it in place. 5972 */ 5973 if (inp && ipsec4_in_reject(m, &inp->ip_inp.inp)) { 5974 MODULE_GLOBAL(ipsec4stat).in_polvio++; 5975 SCTP_STAT_INCR(sctps_hdrops); 5976 goto bad; 5977 } 5978 #endif /* IPSEC */ 5979 5980 /* 5981 * common chunk processing 5982 */ 5983 length = ip->ip_len + iphlen; 5984 offset -= sizeof(struct sctp_chunkhdr); 5985 5986 ecn_bits = ip->ip_tos; 5987 5988 /* sa_ignore NO_NULL_CHK */ 5989 sctp_common_input_processing(&m, iphlen, offset, length, sh, ch, 5990 inp, stcb, net, ecn_bits, vrf_id, port); 5991 /* inp's ref-count reduced && stcb unlocked */ 5992 if (m) { 5993 sctp_m_freem(m); 5994 } 5995 if ((inp) && (refcount_up)) { 5996 /* reduce ref-count */ 5997 SCTP_INP_DECR_REF(inp); 5998 } 5999 return; 6000 bad: 6001 if (stcb) { 6002 SCTP_TCB_UNLOCK(stcb); 6003 } 6004 if ((inp) && (refcount_up)) { 6005 /* reduce ref-count */ 6006 SCTP_INP_DECR_REF(inp); 6007 } 6008 if (m) { 6009 sctp_m_freem(m); 6010 } 6011 return; 6012 } 6013 6014 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP) 6015 extern int *sctp_cpuarry; 6016 6017 #endif 6018 6019 void 6020 sctp_input(struct mbuf *m, int off) 6021 { 6022 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP) 6023 struct ip *ip; 6024 struct sctphdr *sh; 6025 int offset; 6026 int cpu_to_use; 6027 uint32_t flowid, tag; 6028 6029 if (mp_ncpus > 1) { 6030 if (m->m_flags & M_FLOWID) { 6031 flowid = m->m_pkthdr.flowid; 6032 } else { 6033 /* 6034 * No flow id built by lower layers fix it so we 6035 * create one. 6036 */ 6037 ip = mtod(m, struct ip *); 6038 offset = off + sizeof(*sh); 6039 if (SCTP_BUF_LEN(m) < offset) { 6040 if ((m = m_pullup(m, offset)) == 0) { 6041 SCTP_STAT_INCR(sctps_hdrops); 6042 return; 6043 } 6044 ip = mtod(m, struct ip *); 6045 } 6046 sh = (struct sctphdr *)((caddr_t)ip + off); 6047 tag = htonl(sh->v_tag); 6048 flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port); 6049 m->m_pkthdr.flowid = flowid; 6050 m->m_flags |= M_FLOWID; 6051 } 6052 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus]; 6053 sctp_queue_to_mcore(m, off, cpu_to_use); 6054 return; 6055 } 6056 #endif 6057 sctp_input_with_port(m, off, 0); 6058 } 6059 6060 #endif 6061