sctp_input.c revision 235416
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: head/sys/netinet/sctp_input.c 235416 2012-05-13 19:32:49Z tuexen $"); 37 38#include <netinet/sctp_os.h> 39#include <netinet/sctp_var.h> 40#include <netinet/sctp_sysctl.h> 41#include <netinet/sctp_pcb.h> 42#include <netinet/sctp_header.h> 43#include <netinet/sctputil.h> 44#include <netinet/sctp_output.h> 45#include <netinet/sctp_input.h> 46#include <netinet/sctp_auth.h> 47#include <netinet/sctp_indata.h> 48#include <netinet/sctp_asconf.h> 49#include <netinet/sctp_bsd_addr.h> 50#include <netinet/sctp_timer.h> 51#include <netinet/sctp_crc32.h> 52#include <netinet/udp.h> 53#include <sys/smp.h> 54 55 56 57static void 58sctp_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 */ 84static void 85sctp_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 int *abort_no_unlock, uint32_t vrf_id, uint16_t port) 88{ 89 struct sctp_init *init; 90 struct mbuf *op_err; 91 92 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_init: handling INIT tcb:%p\n", 93 stcb); 94 if (stcb == NULL) { 95 SCTP_INP_RLOCK(inp); 96 } 97 /* validate length */ 98 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_chunk)) { 99 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 100 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err, 101 vrf_id, port); 102 if (stcb) 103 *abort_no_unlock = 1; 104 goto outnow; 105 } 106 /* validate parameters */ 107 init = &cp->init; 108 if (init->initiate_tag == 0) { 109 /* protocol error... send abort */ 110 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 111 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err, 112 vrf_id, port); 113 if (stcb) 114 *abort_no_unlock = 1; 115 goto outnow; 116 } 117 if (ntohl(init->a_rwnd) < SCTP_MIN_RWND) { 118 /* invalid parameter... send abort */ 119 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 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 (init->num_inbound_streams == 0) { 127 /* protocol error... send abort */ 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 if (init->num_outbound_streams == 0) { 136 /* protocol error... send abort */ 137 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 138 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err, 139 vrf_id, port); 140 if (stcb) 141 *abort_no_unlock = 1; 142 goto outnow; 143 } 144 if (sctp_validate_init_auth_params(m, offset + sizeof(*cp), 145 offset + ntohs(cp->ch.chunk_length))) { 146 /* auth parameter(s) error... send abort */ 147 sctp_abort_association(inp, stcb, m, iphlen, sh, NULL, vrf_id, port); 148 if (stcb) 149 *abort_no_unlock = 1; 150 goto outnow; 151 } 152 /* 153 * We are only accepting if we have a socket with positive 154 * so_qlimit. 155 */ 156 if ((stcb == NULL) && 157 ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 158 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) || 159 (inp->sctp_socket == NULL) || 160 (inp->sctp_socket->so_qlimit == 0))) { 161 /* 162 * FIX ME ?? What about TCP model and we have a 163 * match/restart case? Actually no fix is needed. the lookup 164 * will always find the existing assoc so stcb would not be 165 * NULL. It may be questionable to do this since we COULD 166 * just send back the INIT-ACK and hope that the app did 167 * accept()'s by the time the COOKIE was sent. But there is 168 * a price to pay for COOKIE generation and I don't want to 169 * pay it on the chance that the app will actually do some 170 * accepts(). The App just looses and should NOT be in this 171 * state :-) 172 */ 173 if (SCTP_BASE_SYSCTL(sctp_blackhole) == 0) { 174 sctp_send_abort(m, iphlen, sh, 0, NULL, vrf_id, port); 175 } 176 goto outnow; 177 } 178 if ((stcb != NULL) && 179 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT)) { 180 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending SHUTDOWN-ACK\n"); 181 sctp_send_shutdown_ack(stcb, NULL); 182 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 183 } else { 184 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n"); 185 sctp_send_initiate_ack(inp, stcb, m, iphlen, offset, sh, cp, vrf_id, port, 186 ((stcb == NULL) ? SCTP_HOLDS_LOCK : SCTP_NOT_LOCKED)); 187 } 188outnow: 189 if (stcb == NULL) { 190 SCTP_INP_RUNLOCK(inp); 191 } 192} 193 194/* 195 * process peer "INIT/INIT-ACK" chunk returns value < 0 on error 196 */ 197 198int 199sctp_is_there_unsent_data(struct sctp_tcb *stcb, int so_locked 200#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING) 201 SCTP_UNUSED 202#endif 203) 204{ 205 int unsent_data = 0; 206 unsigned int i; 207 struct sctp_stream_queue_pending *sp; 208 struct sctp_association *asoc; 209 210 /* 211 * This function returns the number of streams that have true unsent 212 * data on them. Note that as it looks through it will clean up any 213 * places that have old data that has been sent but left at top of 214 * stream queue. 215 */ 216 asoc = &stcb->asoc; 217 SCTP_TCB_SEND_LOCK(stcb); 218 if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 219 /* Check to see if some data queued */ 220 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 221 /* sa_ignore FREED_MEMORY */ 222 sp = TAILQ_FIRST(&stcb->asoc.strmout[i].outqueue); 223 if (sp == NULL) { 224 continue; 225 } 226 if ((sp->msg_is_complete) && 227 (sp->length == 0) && 228 (sp->sender_all_done)) { 229 /* 230 * We are doing differed cleanup. Last time 231 * through when we took all the data the 232 * sender_all_done was not set. 233 */ 234 if (sp->put_last_out == 0) { 235 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n"); 236 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n", 237 sp->sender_all_done, 238 sp->length, 239 sp->msg_is_complete, 240 sp->put_last_out); 241 } 242 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1); 243 TAILQ_REMOVE(&stcb->asoc.strmout[i].outqueue, sp, next); 244 if (sp->net) { 245 sctp_free_remote_addr(sp->net); 246 sp->net = NULL; 247 } 248 if (sp->data) { 249 sctp_m_freem(sp->data); 250 sp->data = NULL; 251 } 252 sctp_free_a_strmoq(stcb, sp, so_locked); 253 } else { 254 unsent_data++; 255 break; 256 } 257 } 258 } 259 SCTP_TCB_SEND_UNLOCK(stcb); 260 return (unsent_data); 261} 262 263static int 264sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb) 265{ 266 struct sctp_init *init; 267 struct sctp_association *asoc; 268 struct sctp_nets *lnet; 269 unsigned int i; 270 271 init = &cp->init; 272 asoc = &stcb->asoc; 273 /* save off parameters */ 274 asoc->peer_vtag = ntohl(init->initiate_tag); 275 asoc->peers_rwnd = ntohl(init->a_rwnd); 276 /* init tsn's */ 277 asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1; 278 279 if (!TAILQ_EMPTY(&asoc->nets)) { 280 /* update any ssthresh's that may have a default */ 281 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) { 282 lnet->ssthresh = asoc->peers_rwnd; 283 if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) { 284 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION); 285 } 286 } 287 } 288 SCTP_TCB_SEND_LOCK(stcb); 289 if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) { 290 unsigned int newcnt; 291 struct sctp_stream_out *outs; 292 struct sctp_stream_queue_pending *sp, *nsp; 293 struct sctp_tmit_chunk *chk, *nchk; 294 295 /* abandon the upper streams */ 296 newcnt = ntohs(init->num_inbound_streams); 297 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) { 298 if (chk->rec.data.stream_number >= newcnt) { 299 TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next); 300 asoc->send_queue_cnt--; 301 if (chk->data != NULL) { 302 sctp_free_bufspace(stcb, asoc, chk, 1); 303 sctp_ulp_notify(SCTP_NOTIFY_UNSENT_DG_FAIL, stcb, 304 0, chk, SCTP_SO_NOT_LOCKED); 305 if (chk->data) { 306 sctp_m_freem(chk->data); 307 chk->data = NULL; 308 } 309 } 310 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 311 /* sa_ignore FREED_MEMORY */ 312 } 313 } 314 if (asoc->strmout) { 315 for (i = newcnt; i < asoc->pre_open_streams; i++) { 316 outs = &asoc->strmout[i]; 317 TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) { 318 TAILQ_REMOVE(&outs->outqueue, sp, next); 319 asoc->stream_queue_cnt--; 320 sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL, 321 stcb, 0, sp, SCTP_SO_NOT_LOCKED); 322 if (sp->data) { 323 sctp_m_freem(sp->data); 324 sp->data = NULL; 325 } 326 if (sp->net) { 327 sctp_free_remote_addr(sp->net); 328 sp->net = NULL; 329 } 330 /* Free the chunk */ 331 sctp_free_a_strmoq(stcb, sp, SCTP_SO_NOT_LOCKED); 332 /* sa_ignore FREED_MEMORY */ 333 } 334 } 335 } 336 /* cut back the count */ 337 asoc->pre_open_streams = newcnt; 338 } 339 SCTP_TCB_SEND_UNLOCK(stcb); 340 asoc->strm_realoutsize = asoc->streamoutcnt = asoc->pre_open_streams; 341 342 /* EY - nr_sack: initialize highest tsn in nr_mapping_array */ 343 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 344 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 345 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 346 } 347 /* This is the next one we expect */ 348 asoc->str_reset_seq_in = asoc->asconf_seq_in + 1; 349 350 asoc->mapping_array_base_tsn = ntohl(init->initial_tsn); 351 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in; 352 353 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 354 /* open the requested streams */ 355 356 if (asoc->strmin != NULL) { 357 /* Free the old ones */ 358 struct sctp_queued_to_read *ctl, *nctl; 359 360 for (i = 0; i < asoc->streamincnt; i++) { 361 TAILQ_FOREACH_SAFE(ctl, &asoc->strmin[i].inqueue, next, nctl) { 362 TAILQ_REMOVE(&asoc->strmin[i].inqueue, ctl, next); 363 sctp_free_remote_addr(ctl->whoFrom); 364 ctl->whoFrom = NULL; 365 sctp_m_freem(ctl->data); 366 ctl->data = NULL; 367 sctp_free_a_readq(stcb, ctl); 368 } 369 } 370 SCTP_FREE(asoc->strmin, SCTP_M_STRMI); 371 } 372 asoc->streamincnt = ntohs(init->num_outbound_streams); 373 if (asoc->streamincnt > MAX_SCTP_STREAMS) { 374 asoc->streamincnt = MAX_SCTP_STREAMS; 375 } 376 SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt * 377 sizeof(struct sctp_stream_in), SCTP_M_STRMI); 378 if (asoc->strmin == NULL) { 379 /* we didn't get memory for the streams! */ 380 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n"); 381 return (-1); 382 } 383 for (i = 0; i < asoc->streamincnt; i++) { 384 asoc->strmin[i].stream_no = i; 385 asoc->strmin[i].last_sequence_delivered = 0xffff; 386 /* 387 * U-stream ranges will be set when the cookie is unpacked. 388 * Or for the INIT sender they are un set (if pr-sctp not 389 * supported) when the INIT-ACK arrives. 390 */ 391 TAILQ_INIT(&asoc->strmin[i].inqueue); 392 asoc->strmin[i].delivery_started = 0; 393 } 394 /* 395 * load_address_from_init will put the addresses into the 396 * association when the COOKIE is processed or the INIT-ACK is 397 * processed. Both types of COOKIE's existing and new call this 398 * routine. It will remove addresses that are no longer in the 399 * association (for the restarting case where addresses are 400 * removed). Up front when the INIT arrives we will discard it if it 401 * is a restart and new addresses have been added. 402 */ 403 /* sa_ignore MEMLEAK */ 404 return (0); 405} 406 407/* 408 * INIT-ACK message processing/consumption returns value < 0 on error 409 */ 410static int 411sctp_process_init_ack(struct mbuf *m, int iphlen, int offset, 412 struct sctphdr *sh, struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 413 struct sctp_nets *net, int *abort_no_unlock, uint32_t vrf_id) 414{ 415 struct sctp_association *asoc; 416 struct mbuf *op_err; 417 int retval, abort_flag; 418 uint32_t initack_limit; 419 int nat_friendly = 0; 420 421 /* First verify that we have no illegal param's */ 422 abort_flag = 0; 423 op_err = NULL; 424 425 op_err = sctp_arethere_unrecognized_parameters(m, 426 (offset + sizeof(struct sctp_init_chunk)), 427 &abort_flag, (struct sctp_chunkhdr *)cp, &nat_friendly); 428 if (abort_flag) { 429 /* Send an abort and notify peer */ 430 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 431 *abort_no_unlock = 1; 432 return (-1); 433 } 434 asoc = &stcb->asoc; 435 asoc->peer_supports_nat = (uint8_t) nat_friendly; 436 /* process the peer's parameters in the INIT-ACK */ 437 retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb); 438 if (retval < 0) { 439 return (retval); 440 } 441 initack_limit = offset + ntohs(cp->ch.chunk_length); 442 /* load all addresses */ 443 if ((retval = sctp_load_addresses_from_init(stcb, m, 444 (offset + sizeof(struct sctp_init_chunk)), initack_limit, sh, 445 NULL))) { 446 /* Huh, we should abort */ 447 SCTPDBG(SCTP_DEBUG_INPUT1, 448 "Load addresses from INIT causes an abort %d\n", 449 retval); 450 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 451 NULL, 0, net->port); 452 *abort_no_unlock = 1; 453 return (-1); 454 } 455 /* if the peer doesn't support asconf, flush the asconf queue */ 456 if (asoc->peer_supports_asconf == 0) { 457 struct sctp_asconf_addr *param, *nparam; 458 459 TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) { 460 TAILQ_REMOVE(&asoc->asconf_queue, param, next); 461 SCTP_FREE(param, SCTP_M_ASC_ADDR); 462 } 463 } 464 stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs, 465 stcb->asoc.local_hmacs); 466 if (op_err) { 467 sctp_queue_op_err(stcb, op_err); 468 /* queuing will steal away the mbuf chain to the out queue */ 469 op_err = NULL; 470 } 471 /* extract the cookie and queue it to "echo" it back... */ 472 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 473 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 474 stcb->asoc.overall_error_count, 475 0, 476 SCTP_FROM_SCTP_INPUT, 477 __LINE__); 478 } 479 stcb->asoc.overall_error_count = 0; 480 net->error_count = 0; 481 482 /* 483 * Cancel the INIT timer, We do this first before queueing the 484 * cookie. We always cancel at the primary to assue that we are 485 * canceling the timer started by the INIT which always goes to the 486 * primary. 487 */ 488 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb, 489 asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4); 490 491 /* calculate the RTO */ 492 net->RTO = sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, sctp_align_safe_nocopy, 493 SCTP_RTT_FROM_NON_DATA); 494 495 retval = sctp_send_cookie_echo(m, offset, stcb, net); 496 if (retval < 0) { 497 /* 498 * No cookie, we probably should send a op error. But in any 499 * case if there is no cookie in the INIT-ACK, we can 500 * abandon the peer, its broke. 501 */ 502 if (retval == -3) { 503 /* We abort with an error of missing mandatory param */ 504 op_err = 505 sctp_generate_invmanparam(SCTP_CAUSE_MISSING_PARAM); 506 if (op_err) { 507 /* 508 * Expand beyond to include the mandatory 509 * param cookie 510 */ 511 struct sctp_inv_mandatory_param *mp; 512 513 SCTP_BUF_LEN(op_err) = 514 sizeof(struct sctp_inv_mandatory_param); 515 mp = mtod(op_err, 516 struct sctp_inv_mandatory_param *); 517 /* Subtract the reserved param */ 518 mp->length = 519 htons(sizeof(struct sctp_inv_mandatory_param) - 2); 520 mp->num_param = htonl(1); 521 mp->param = htons(SCTP_STATE_COOKIE); 522 mp->resv = 0; 523 } 524 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 525 sh, op_err, vrf_id, net->port); 526 *abort_no_unlock = 1; 527 } 528 return (retval); 529 } 530 return (0); 531} 532 533static void 534sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp, 535 struct sctp_tcb *stcb, struct sctp_nets *net) 536{ 537 struct sockaddr_storage store; 538 struct sctp_nets *r_net, *f_net; 539 struct timeval tv; 540 int req_prim = 0; 541 uint16_t old_error_counter; 542 543#ifdef INET 544 struct sockaddr_in *sin; 545 546#endif 547#ifdef INET6 548 struct sockaddr_in6 *sin6; 549 550#endif 551 552 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) { 553 /* Invalid length */ 554 return; 555 } 556 memset(&store, 0, sizeof(store)); 557 switch (cp->heartbeat.hb_info.addr_family) { 558#ifdef INET 559 case AF_INET: 560 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) { 561 sin = (struct sockaddr_in *)&store; 562 sin->sin_family = cp->heartbeat.hb_info.addr_family; 563 sin->sin_len = cp->heartbeat.hb_info.addr_len; 564 sin->sin_port = stcb->rport; 565 memcpy(&sin->sin_addr, cp->heartbeat.hb_info.address, 566 sizeof(sin->sin_addr)); 567 } else { 568 return; 569 } 570 break; 571#endif 572#ifdef INET6 573 case AF_INET6: 574 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) { 575 sin6 = (struct sockaddr_in6 *)&store; 576 sin6->sin6_family = cp->heartbeat.hb_info.addr_family; 577 sin6->sin6_len = cp->heartbeat.hb_info.addr_len; 578 sin6->sin6_port = stcb->rport; 579 memcpy(&sin6->sin6_addr, cp->heartbeat.hb_info.address, 580 sizeof(sin6->sin6_addr)); 581 } else { 582 return; 583 } 584 break; 585#endif 586 default: 587 return; 588 } 589 r_net = sctp_findnet(stcb, (struct sockaddr *)&store); 590 if (r_net == NULL) { 591 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n"); 592 return; 593 } 594 if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) && 595 (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) && 596 (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) { 597 /* 598 * If the its a HB and it's random value is correct when can 599 * confirm the destination. 600 */ 601 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 602 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) { 603 stcb->asoc.primary_destination = r_net; 604 r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY; 605 f_net = TAILQ_FIRST(&stcb->asoc.nets); 606 if (f_net != r_net) { 607 /* 608 * first one on the list is NOT the primary 609 * sctp_cmpaddr() is much more efficent if 610 * the primary is the first on the list, 611 * make it so. 612 */ 613 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next); 614 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next); 615 } 616 req_prim = 1; 617 } 618 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 619 stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 620 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3); 621 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 622 } 623 old_error_counter = r_net->error_count; 624 r_net->error_count = 0; 625 r_net->hb_responded = 1; 626 tv.tv_sec = cp->heartbeat.hb_info.time_value_1; 627 tv.tv_usec = cp->heartbeat.hb_info.time_value_2; 628 /* Now lets do a RTO with this */ 629 r_net->RTO = sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, sctp_align_safe_nocopy, 630 SCTP_RTT_FROM_NON_DATA); 631 if (!(r_net->dest_state & SCTP_ADDR_REACHABLE)) { 632 r_net->dest_state |= SCTP_ADDR_REACHABLE; 633 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb, 634 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 635 } 636 if (r_net->dest_state & SCTP_ADDR_PF) { 637 r_net->dest_state &= ~SCTP_ADDR_PF; 638 stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net); 639 } 640 if (old_error_counter > 0) { 641 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3); 642 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 643 } 644 if (r_net == stcb->asoc.primary_destination) { 645 if (stcb->asoc.alternate) { 646 /* release the alternate, primary is good */ 647 sctp_free_remote_addr(stcb->asoc.alternate); 648 stcb->asoc.alternate = NULL; 649 } 650 } 651 /* Mobility adaptation */ 652 if (req_prim) { 653 if ((sctp_is_mobility_feature_on(stcb->sctp_ep, 654 SCTP_MOBILITY_BASE) || 655 sctp_is_mobility_feature_on(stcb->sctp_ep, 656 SCTP_MOBILITY_FASTHANDOFF)) && 657 sctp_is_mobility_feature_on(stcb->sctp_ep, 658 SCTP_MOBILITY_PRIM_DELETED)) { 659 660 sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED, stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_TIMER + SCTP_LOC_7); 661 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 662 SCTP_MOBILITY_FASTHANDOFF)) { 663 sctp_assoc_immediate_retrans(stcb, 664 stcb->asoc.primary_destination); 665 } 666 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 667 SCTP_MOBILITY_BASE)) { 668 sctp_move_chunks_from_net(stcb, 669 stcb->asoc.deleted_primary); 670 } 671 sctp_delete_prim_timer(stcb->sctp_ep, stcb, 672 stcb->asoc.deleted_primary); 673 } 674 } 675} 676 677static int 678sctp_handle_nat_colliding_state(struct sctp_tcb *stcb) 679{ 680 /* 681 * return 0 means we want you to proceed with the abort non-zero 682 * means no abort processing 683 */ 684 struct sctpasochead *head; 685 686 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_WAIT) { 687 /* generate a new vtag and send init */ 688 LIST_REMOVE(stcb, sctp_asocs); 689 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 690 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 691 /* 692 * put it in the bucket in the vtag hash of assoc's for the 693 * system 694 */ 695 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 696 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 697 return (1); 698 } 699 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) { 700 /* 701 * treat like a case where the cookie expired i.e.: - dump 702 * current cookie. - generate a new vtag. - resend init. 703 */ 704 /* generate a new vtag and send init */ 705 LIST_REMOVE(stcb, sctp_asocs); 706 stcb->asoc.state &= ~SCTP_STATE_COOKIE_ECHOED; 707 stcb->asoc.state |= SCTP_STATE_COOKIE_WAIT; 708 sctp_stop_all_cookie_timers(stcb); 709 sctp_toss_old_cookies(stcb, &stcb->asoc); 710 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 711 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 712 /* 713 * put it in the bucket in the vtag hash of assoc's for the 714 * system 715 */ 716 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 717 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 718 return (1); 719 } 720 return (0); 721} 722 723static int 724sctp_handle_nat_missing_state(struct sctp_tcb *stcb, 725 struct sctp_nets *net) 726{ 727 /* 728 * return 0 means we want you to proceed with the abort non-zero 729 * means no abort processing 730 */ 731 if (stcb->asoc.peer_supports_auth == 0) { 732 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n"); 733 return (0); 734 } 735 sctp_asconf_send_nat_state_update(stcb, net); 736 return (1); 737} 738 739 740static void 741sctp_handle_abort(struct sctp_abort_chunk *abort, 742 struct sctp_tcb *stcb, struct sctp_nets *net) 743{ 744#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 745 struct socket *so; 746 747#endif 748 uint16_t len; 749 uint16_t error; 750 751 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n"); 752 if (stcb == NULL) 753 return; 754 755 len = ntohs(abort->ch.chunk_length); 756 if (len > sizeof(struct sctp_chunkhdr)) { 757 /* 758 * Need to check the cause codes for our two magic nat 759 * aborts which don't kill the assoc necessarily. 760 */ 761 struct sctp_missing_nat_state *natc; 762 763 natc = (struct sctp_missing_nat_state *)(abort + 1); 764 error = ntohs(natc->cause); 765 if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) { 766 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n", 767 abort->ch.chunk_flags); 768 if (sctp_handle_nat_colliding_state(stcb)) { 769 return; 770 } 771 } else if (error == SCTP_CAUSE_NAT_MISSING_STATE) { 772 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n", 773 abort->ch.chunk_flags); 774 if (sctp_handle_nat_missing_state(stcb, net)) { 775 return; 776 } 777 } 778 } else { 779 error = 0; 780 } 781 /* stop any receive timers */ 782 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_6); 783 /* notify user of the abort and clean up... */ 784 sctp_abort_notification(stcb, 1, error, abort, SCTP_SO_NOT_LOCKED); 785 /* free the tcb */ 786 SCTP_STAT_INCR_COUNTER32(sctps_aborted); 787 if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) || 788 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 789 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 790 } 791#ifdef SCTP_ASOCLOG_OF_TSNS 792 sctp_print_out_track_log(stcb); 793#endif 794#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 795 so = SCTP_INP_SO(stcb->sctp_ep); 796 atomic_add_int(&stcb->asoc.refcnt, 1); 797 SCTP_TCB_UNLOCK(stcb); 798 SCTP_SOCKET_LOCK(so, 1); 799 SCTP_TCB_LOCK(stcb); 800 atomic_subtract_int(&stcb->asoc.refcnt, 1); 801#endif 802 stcb->asoc.state |= SCTP_STATE_WAS_ABORTED; 803 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 804 SCTP_FROM_SCTP_INPUT + SCTP_LOC_6); 805#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 806 SCTP_SOCKET_UNLOCK(so, 1); 807#endif 808 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n"); 809} 810 811static void 812sctp_start_net_timers(struct sctp_tcb *stcb) 813{ 814 uint32_t cnt_hb_sent; 815 struct sctp_nets *net; 816 817 cnt_hb_sent = 0; 818 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 819 /* 820 * For each network start: 1) A pmtu timer. 2) A HB timer 3) 821 * If the dest in unconfirmed send a hb as well if under 822 * max_hb_burst have been sent. 823 */ 824 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net); 825 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net); 826 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) && 827 (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) { 828 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 829 cnt_hb_sent++; 830 } 831 } 832 if (cnt_hb_sent) { 833 sctp_chunk_output(stcb->sctp_ep, stcb, 834 SCTP_OUTPUT_FROM_COOKIE_ACK, 835 SCTP_SO_NOT_LOCKED); 836 } 837} 838 839 840static void 841sctp_handle_shutdown(struct sctp_shutdown_chunk *cp, 842 struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag) 843{ 844 struct sctp_association *asoc; 845 int some_on_streamwheel; 846 847#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 848 struct socket *so; 849 850#endif 851 852 SCTPDBG(SCTP_DEBUG_INPUT2, 853 "sctp_handle_shutdown: handling SHUTDOWN\n"); 854 if (stcb == NULL) 855 return; 856 asoc = &stcb->asoc; 857 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) || 858 (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) { 859 return; 860 } 861 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) { 862 /* Shutdown NOT the expected size */ 863 return; 864 } else { 865 sctp_update_acked(stcb, cp, abort_flag); 866 if (*abort_flag) { 867 return; 868 } 869 } 870 if (asoc->control_pdapi) { 871 /* 872 * With a normal shutdown we assume the end of last record. 873 */ 874 SCTP_INP_READ_LOCK(stcb->sctp_ep); 875 asoc->control_pdapi->end_added = 1; 876 asoc->control_pdapi->pdapi_aborted = 1; 877 asoc->control_pdapi = NULL; 878 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 879#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 880 so = SCTP_INP_SO(stcb->sctp_ep); 881 atomic_add_int(&stcb->asoc.refcnt, 1); 882 SCTP_TCB_UNLOCK(stcb); 883 SCTP_SOCKET_LOCK(so, 1); 884 SCTP_TCB_LOCK(stcb); 885 atomic_subtract_int(&stcb->asoc.refcnt, 1); 886 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 887 /* assoc was freed while we were unlocked */ 888 SCTP_SOCKET_UNLOCK(so, 1); 889 return; 890 } 891#endif 892 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 893#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 894 SCTP_SOCKET_UNLOCK(so, 1); 895#endif 896 } 897 /* goto SHUTDOWN_RECEIVED state to block new requests */ 898 if (stcb->sctp_socket) { 899 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) && 900 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) && 901 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) { 902 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_RECEIVED); 903 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 904 /* 905 * notify upper layer that peer has initiated a 906 * shutdown 907 */ 908 sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 909 910 /* reset time */ 911 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 912 } 913 } 914 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) { 915 /* 916 * stop the shutdown timer, since we WILL move to 917 * SHUTDOWN-ACK-SENT. 918 */ 919 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_8); 920 } 921 /* Now is there unsent data on a stream somewhere? */ 922 some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED); 923 924 if (!TAILQ_EMPTY(&asoc->send_queue) || 925 !TAILQ_EMPTY(&asoc->sent_queue) || 926 some_on_streamwheel) { 927 /* By returning we will push more data out */ 928 return; 929 } else { 930 /* no outstanding data to send, so move on... */ 931 /* send SHUTDOWN-ACK */ 932 sctp_send_shutdown_ack(stcb, net); 933 /* move to SHUTDOWN-ACK-SENT state */ 934 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) || 935 (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 936 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 937 } 938 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT); 939 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 940 sctp_stop_timers_for_shutdown(stcb); 941 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, 942 stcb, net); 943 } 944} 945 946static void 947sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED, 948 struct sctp_tcb *stcb, 949 struct sctp_nets *net) 950{ 951 struct sctp_association *asoc; 952 953#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 954 struct socket *so; 955 956 so = SCTP_INP_SO(stcb->sctp_ep); 957#endif 958 SCTPDBG(SCTP_DEBUG_INPUT2, 959 "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n"); 960 if (stcb == NULL) 961 return; 962 963 asoc = &stcb->asoc; 964 /* process according to association state */ 965 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) || 966 (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) { 967 /* unexpected SHUTDOWN-ACK... do OOTB handling... */ 968 sctp_send_shutdown_complete(stcb, net, 1); 969 SCTP_TCB_UNLOCK(stcb); 970 return; 971 } 972 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) && 973 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) { 974 /* unexpected SHUTDOWN-ACK... so ignore... */ 975 SCTP_TCB_UNLOCK(stcb); 976 return; 977 } 978 if (asoc->control_pdapi) { 979 /* 980 * With a normal shutdown we assume the end of last record. 981 */ 982 SCTP_INP_READ_LOCK(stcb->sctp_ep); 983 asoc->control_pdapi->end_added = 1; 984 asoc->control_pdapi->pdapi_aborted = 1; 985 asoc->control_pdapi = NULL; 986 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 987#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 988 atomic_add_int(&stcb->asoc.refcnt, 1); 989 SCTP_TCB_UNLOCK(stcb); 990 SCTP_SOCKET_LOCK(so, 1); 991 SCTP_TCB_LOCK(stcb); 992 atomic_subtract_int(&stcb->asoc.refcnt, 1); 993 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 994 /* assoc was freed while we were unlocked */ 995 SCTP_SOCKET_UNLOCK(so, 1); 996 return; 997 } 998#endif 999 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 1000#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1001 SCTP_SOCKET_UNLOCK(so, 1); 1002#endif 1003 } 1004 /* are the queues empty? */ 1005 if (!TAILQ_EMPTY(&asoc->send_queue) || 1006 !TAILQ_EMPTY(&asoc->sent_queue) || 1007 !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 1008 sctp_report_all_outbound(stcb, 0, 0, SCTP_SO_NOT_LOCKED); 1009 } 1010 /* stop the timer */ 1011 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9); 1012 /* send SHUTDOWN-COMPLETE */ 1013 sctp_send_shutdown_complete(stcb, net, 0); 1014 /* notify upper layer protocol */ 1015 if (stcb->sctp_socket) { 1016 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1017 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 1018 stcb->sctp_socket->so_snd.sb_cc = 0; 1019 } 1020 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 1021 } 1022 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 1023 /* free the TCB but first save off the ep */ 1024#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1025 atomic_add_int(&stcb->asoc.refcnt, 1); 1026 SCTP_TCB_UNLOCK(stcb); 1027 SCTP_SOCKET_LOCK(so, 1); 1028 SCTP_TCB_LOCK(stcb); 1029 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1030#endif 1031 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1032 SCTP_FROM_SCTP_INPUT + SCTP_LOC_10); 1033#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1034 SCTP_SOCKET_UNLOCK(so, 1); 1035#endif 1036} 1037 1038/* 1039 * Skip past the param header and then we will find the chunk that caused the 1040 * problem. There are two possiblities ASCONF or FWD-TSN other than that and 1041 * our peer must be broken. 1042 */ 1043static void 1044sctp_process_unrecog_chunk(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr, 1045 struct sctp_nets *net) 1046{ 1047 struct sctp_chunkhdr *chk; 1048 1049 chk = (struct sctp_chunkhdr *)((caddr_t)phdr + sizeof(*phdr)); 1050 switch (chk->chunk_type) { 1051 case SCTP_ASCONF_ACK: 1052 case SCTP_ASCONF: 1053 sctp_asconf_cleanup(stcb, net); 1054 break; 1055 case SCTP_FORWARD_CUM_TSN: 1056 stcb->asoc.peer_supports_prsctp = 0; 1057 break; 1058 default: 1059 SCTPDBG(SCTP_DEBUG_INPUT2, 1060 "Peer does not support chunk type %d(%x)??\n", 1061 chk->chunk_type, (uint32_t) chk->chunk_type); 1062 break; 1063 } 1064} 1065 1066/* 1067 * Skip past the param header and then we will find the param that caused the 1068 * problem. There are a number of param's in a ASCONF OR the prsctp param 1069 * these will turn of specific features. 1070 */ 1071static void 1072sctp_process_unrecog_param(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr) 1073{ 1074 struct sctp_paramhdr *pbad; 1075 1076 pbad = phdr + 1; 1077 switch (ntohs(pbad->param_type)) { 1078 /* pr-sctp draft */ 1079 case SCTP_PRSCTP_SUPPORTED: 1080 stcb->asoc.peer_supports_prsctp = 0; 1081 break; 1082 case SCTP_SUPPORTED_CHUNK_EXT: 1083 break; 1084 /* draft-ietf-tsvwg-addip-sctp */ 1085 case SCTP_HAS_NAT_SUPPORT: 1086 stcb->asoc.peer_supports_nat = 0; 1087 break; 1088 case SCTP_ADD_IP_ADDRESS: 1089 case SCTP_DEL_IP_ADDRESS: 1090 case SCTP_SET_PRIM_ADDR: 1091 stcb->asoc.peer_supports_asconf = 0; 1092 break; 1093 case SCTP_SUCCESS_REPORT: 1094 case SCTP_ERROR_CAUSE_IND: 1095 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n"); 1096 SCTPDBG(SCTP_DEBUG_INPUT2, 1097 "Turning off ASCONF to this strange peer\n"); 1098 stcb->asoc.peer_supports_asconf = 0; 1099 break; 1100 default: 1101 SCTPDBG(SCTP_DEBUG_INPUT2, 1102 "Peer does not support param type %d(%x)??\n", 1103 pbad->param_type, (uint32_t) pbad->param_type); 1104 break; 1105 } 1106} 1107 1108static int 1109sctp_handle_error(struct sctp_chunkhdr *ch, 1110 struct sctp_tcb *stcb, struct sctp_nets *net) 1111{ 1112 int chklen; 1113 struct sctp_paramhdr *phdr; 1114 uint16_t error_type; 1115 uint16_t error_len; 1116 struct sctp_association *asoc; 1117 int adjust; 1118 1119#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1120 struct socket *so; 1121 1122#endif 1123 1124 /* parse through all of the errors and process */ 1125 asoc = &stcb->asoc; 1126 phdr = (struct sctp_paramhdr *)((caddr_t)ch + 1127 sizeof(struct sctp_chunkhdr)); 1128 chklen = ntohs(ch->chunk_length) - sizeof(struct sctp_chunkhdr); 1129 while ((size_t)chklen >= sizeof(struct sctp_paramhdr)) { 1130 /* Process an Error Cause */ 1131 error_type = ntohs(phdr->param_type); 1132 error_len = ntohs(phdr->param_length); 1133 if ((error_len > chklen) || (error_len == 0)) { 1134 /* invalid param length for this param */ 1135 SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in error param- chunk left:%d errorlen:%d\n", 1136 chklen, error_len); 1137 return (0); 1138 } 1139 switch (error_type) { 1140 case SCTP_CAUSE_INVALID_STREAM: 1141 case SCTP_CAUSE_MISSING_PARAM: 1142 case SCTP_CAUSE_INVALID_PARAM: 1143 case SCTP_CAUSE_NO_USER_DATA: 1144 SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %d back? We have a bug :/ (or do they?)\n", 1145 error_type); 1146 break; 1147 case SCTP_CAUSE_NAT_COLLIDING_STATE: 1148 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n", 1149 ch->chunk_flags); 1150 if (sctp_handle_nat_colliding_state(stcb)) { 1151 return (0); 1152 } 1153 break; 1154 case SCTP_CAUSE_NAT_MISSING_STATE: 1155 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n", 1156 ch->chunk_flags); 1157 if (sctp_handle_nat_missing_state(stcb, net)) { 1158 return (0); 1159 } 1160 break; 1161 case SCTP_CAUSE_STALE_COOKIE: 1162 /* 1163 * We only act if we have echoed a cookie and are 1164 * waiting. 1165 */ 1166 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) { 1167 int *p; 1168 1169 p = (int *)((caddr_t)phdr + sizeof(*phdr)); 1170 /* Save the time doubled */ 1171 asoc->cookie_preserve_req = ntohl(*p) << 1; 1172 asoc->stale_cookie_count++; 1173 if (asoc->stale_cookie_count > 1174 asoc->max_init_times) { 1175 sctp_abort_notification(stcb, 0, 0, NULL, SCTP_SO_NOT_LOCKED); 1176 /* now free the asoc */ 1177#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1178 so = SCTP_INP_SO(stcb->sctp_ep); 1179 atomic_add_int(&stcb->asoc.refcnt, 1); 1180 SCTP_TCB_UNLOCK(stcb); 1181 SCTP_SOCKET_LOCK(so, 1); 1182 SCTP_TCB_LOCK(stcb); 1183 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1184#endif 1185 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1186 SCTP_FROM_SCTP_INPUT + SCTP_LOC_11); 1187#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1188 SCTP_SOCKET_UNLOCK(so, 1); 1189#endif 1190 return (-1); 1191 } 1192 /* blast back to INIT state */ 1193 sctp_toss_old_cookies(stcb, &stcb->asoc); 1194 asoc->state &= ~SCTP_STATE_COOKIE_ECHOED; 1195 asoc->state |= SCTP_STATE_COOKIE_WAIT; 1196 sctp_stop_all_cookie_timers(stcb); 1197 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 1198 } 1199 break; 1200 case SCTP_CAUSE_UNRESOLVABLE_ADDR: 1201 /* 1202 * Nothing we can do here, we don't do hostname 1203 * addresses so if the peer does not like my IPv6 1204 * (or IPv4 for that matter) it does not matter. If 1205 * they don't support that type of address, they can 1206 * NOT possibly get that packet type... i.e. with no 1207 * IPv6 you can't recieve a IPv6 packet. so we can 1208 * safely ignore this one. If we ever added support 1209 * for HOSTNAME Addresses, then we would need to do 1210 * something here. 1211 */ 1212 break; 1213 case SCTP_CAUSE_UNRECOG_CHUNK: 1214 sctp_process_unrecog_chunk(stcb, phdr, net); 1215 break; 1216 case SCTP_CAUSE_UNRECOG_PARAM: 1217 sctp_process_unrecog_param(stcb, phdr); 1218 break; 1219 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN: 1220 /* 1221 * We ignore this since the timer will drive out a 1222 * new cookie anyway and there timer will drive us 1223 * to send a SHUTDOWN_COMPLETE. We can't send one 1224 * here since we don't have their tag. 1225 */ 1226 break; 1227 case SCTP_CAUSE_DELETING_LAST_ADDR: 1228 case SCTP_CAUSE_RESOURCE_SHORTAGE: 1229 case SCTP_CAUSE_DELETING_SRC_ADDR: 1230 /* 1231 * We should NOT get these here, but in a 1232 * ASCONF-ACK. 1233 */ 1234 SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a Operational Error?<%d>?\n", 1235 error_type); 1236 break; 1237 case SCTP_CAUSE_OUT_OF_RESC: 1238 /* 1239 * And what, pray tell do we do with the fact that 1240 * the peer is out of resources? Not really sure we 1241 * could do anything but abort. I suspect this 1242 * should have came WITH an abort instead of in a 1243 * OP-ERROR. 1244 */ 1245 break; 1246 default: 1247 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown error type = 0x%xh\n", 1248 error_type); 1249 break; 1250 } 1251 adjust = SCTP_SIZE32(error_len); 1252 chklen -= adjust; 1253 phdr = (struct sctp_paramhdr *)((caddr_t)phdr + adjust); 1254 } 1255 return (0); 1256} 1257 1258static int 1259sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset, 1260 struct sctphdr *sh, struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 1261 struct sctp_nets *net, int *abort_no_unlock, uint32_t vrf_id) 1262{ 1263 struct sctp_init_ack *init_ack; 1264 struct mbuf *op_err; 1265 1266 SCTPDBG(SCTP_DEBUG_INPUT2, 1267 "sctp_handle_init_ack: handling INIT-ACK\n"); 1268 1269 if (stcb == NULL) { 1270 SCTPDBG(SCTP_DEBUG_INPUT2, 1271 "sctp_handle_init_ack: TCB is null\n"); 1272 return (-1); 1273 } 1274 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) { 1275 /* Invalid length */ 1276 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 1277 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 1278 op_err, 0, net->port); 1279 *abort_no_unlock = 1; 1280 return (-1); 1281 } 1282 init_ack = &cp->init; 1283 /* validate parameters */ 1284 if (init_ack->initiate_tag == 0) { 1285 /* protocol error... send an abort */ 1286 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 1287 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 1288 op_err, 0, net->port); 1289 *abort_no_unlock = 1; 1290 return (-1); 1291 } 1292 if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) { 1293 /* protocol error... send an abort */ 1294 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 1295 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 1296 op_err, 0, net->port); 1297 *abort_no_unlock = 1; 1298 return (-1); 1299 } 1300 if (init_ack->num_inbound_streams == 0) { 1301 /* protocol error... send an abort */ 1302 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 1303 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 1304 op_err, 0, net->port); 1305 *abort_no_unlock = 1; 1306 return (-1); 1307 } 1308 if (init_ack->num_outbound_streams == 0) { 1309 /* protocol error... send an abort */ 1310 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 1311 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 1312 op_err, 0, net->port); 1313 *abort_no_unlock = 1; 1314 return (-1); 1315 } 1316 /* process according to association state... */ 1317 switch (stcb->asoc.state & SCTP_STATE_MASK) { 1318 case SCTP_STATE_COOKIE_WAIT: 1319 /* this is the expected state for this chunk */ 1320 /* process the INIT-ACK parameters */ 1321 if (stcb->asoc.primary_destination->dest_state & 1322 SCTP_ADDR_UNCONFIRMED) { 1323 /* 1324 * The primary is where we sent the INIT, we can 1325 * always consider it confirmed when the INIT-ACK is 1326 * returned. Do this before we load addresses 1327 * though. 1328 */ 1329 stcb->asoc.primary_destination->dest_state &= 1330 ~SCTP_ADDR_UNCONFIRMED; 1331 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 1332 stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED); 1333 } 1334 if (sctp_process_init_ack(m, iphlen, offset, sh, cp, stcb, 1335 net, abort_no_unlock, vrf_id) < 0) { 1336 /* error in parsing parameters */ 1337 return (-1); 1338 } 1339 /* update our state */ 1340 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n"); 1341 SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_ECHOED); 1342 1343 /* reset the RTO calc */ 1344 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 1345 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 1346 stcb->asoc.overall_error_count, 1347 0, 1348 SCTP_FROM_SCTP_INPUT, 1349 __LINE__); 1350 } 1351 stcb->asoc.overall_error_count = 0; 1352 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 1353 /* 1354 * collapse the init timer back in case of a exponential 1355 * backoff 1356 */ 1357 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep, 1358 stcb, net); 1359 /* 1360 * the send at the end of the inbound data processing will 1361 * cause the cookie to be sent 1362 */ 1363 break; 1364 case SCTP_STATE_SHUTDOWN_SENT: 1365 /* incorrect state... discard */ 1366 break; 1367 case SCTP_STATE_COOKIE_ECHOED: 1368 /* incorrect state... discard */ 1369 break; 1370 case SCTP_STATE_OPEN: 1371 /* incorrect state... discard */ 1372 break; 1373 case SCTP_STATE_EMPTY: 1374 case SCTP_STATE_INUSE: 1375 default: 1376 /* incorrect state... discard */ 1377 return (-1); 1378 break; 1379 } 1380 SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n"); 1381 return (0); 1382} 1383 1384static struct sctp_tcb * 1385sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1386 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1387 struct sctp_inpcb *inp, struct sctp_nets **netp, 1388 struct sockaddr *init_src, int *notification, 1389 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1390 uint32_t vrf_id, uint16_t port); 1391 1392 1393/* 1394 * handle a state cookie for an existing association m: input packet mbuf 1395 * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a 1396 * "split" mbuf and the cookie signature does not exist offset: offset into 1397 * mbuf to the cookie-echo chunk 1398 */ 1399static struct sctp_tcb * 1400sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset, 1401 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1402 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp, 1403 struct sockaddr *init_src, int *notification, 1404 uint32_t vrf_id, int auth_skipped, uint32_t auth_offset, uint32_t auth_len, uint16_t port) 1405{ 1406 struct sctp_association *asoc; 1407 struct sctp_init_chunk *init_cp, init_buf; 1408 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1409 struct sctp_nets *net; 1410 struct mbuf *op_err; 1411 struct sctp_paramhdr *ph; 1412 int init_offset, initack_offset, i; 1413 int retval; 1414 int spec_flag = 0; 1415 uint32_t how_indx; 1416 1417 net = *netp; 1418 /* I know that the TCB is non-NULL from the caller */ 1419 asoc = &stcb->asoc; 1420 for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) { 1421 if (asoc->cookie_how[how_indx] == 0) 1422 break; 1423 } 1424 if (how_indx < sizeof(asoc->cookie_how)) { 1425 asoc->cookie_how[how_indx] = 1; 1426 } 1427 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 1428 /* SHUTDOWN came in after sending INIT-ACK */ 1429 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination); 1430 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 1431 0, M_DONTWAIT, 1, MT_DATA); 1432 if (op_err == NULL) { 1433 /* FOOBAR */ 1434 return (NULL); 1435 } 1436 /* Set the len */ 1437 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_paramhdr); 1438 ph = mtod(op_err, struct sctp_paramhdr *); 1439 ph->param_type = htons(SCTP_CAUSE_COOKIE_IN_SHUTDOWN); 1440 ph->param_length = htons(sizeof(struct sctp_paramhdr)); 1441 sctp_send_operr_to(m, iphlen, op_err, cookie->peers_vtag, 1442 vrf_id, net->port); 1443 if (how_indx < sizeof(asoc->cookie_how)) 1444 asoc->cookie_how[how_indx] = 2; 1445 return (NULL); 1446 } 1447 /* 1448 * find and validate the INIT chunk in the cookie (peer's info) the 1449 * INIT should start after the cookie-echo header struct (chunk 1450 * header, state cookie header struct) 1451 */ 1452 init_offset = offset += sizeof(struct sctp_cookie_echo_chunk); 1453 1454 init_cp = (struct sctp_init_chunk *) 1455 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 1456 (uint8_t *) & init_buf); 1457 if (init_cp == NULL) { 1458 /* could not pull a INIT chunk in cookie */ 1459 return (NULL); 1460 } 1461 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 1462 return (NULL); 1463 } 1464 /* 1465 * find and validate the INIT-ACK chunk in the cookie (my info) the 1466 * INIT-ACK follows the INIT chunk 1467 */ 1468 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 1469 initack_cp = (struct sctp_init_ack_chunk *) 1470 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 1471 (uint8_t *) & initack_buf); 1472 if (initack_cp == NULL) { 1473 /* could not pull INIT-ACK chunk in cookie */ 1474 return (NULL); 1475 } 1476 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 1477 return (NULL); 1478 } 1479 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1480 (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) { 1481 /* 1482 * case D in Section 5.2.4 Table 2: MMAA process accordingly 1483 * to get into the OPEN state 1484 */ 1485 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1486 /*- 1487 * Opps, this means that we somehow generated two vtag's 1488 * the same. I.e. we did: 1489 * Us Peer 1490 * <---INIT(tag=a)------ 1491 * ----INIT-ACK(tag=t)--> 1492 * ----INIT(tag=t)------> *1 1493 * <---INIT-ACK(tag=a)--- 1494 * <----CE(tag=t)------------- *2 1495 * 1496 * At point *1 we should be generating a different 1497 * tag t'. Which means we would throw away the CE and send 1498 * ours instead. Basically this is case C (throw away side). 1499 */ 1500 if (how_indx < sizeof(asoc->cookie_how)) 1501 asoc->cookie_how[how_indx] = 17; 1502 return (NULL); 1503 1504 } 1505 switch SCTP_GET_STATE 1506 (asoc) { 1507 case SCTP_STATE_COOKIE_WAIT: 1508 case SCTP_STATE_COOKIE_ECHOED: 1509 /* 1510 * INIT was sent but got a COOKIE_ECHO with the 1511 * correct tags... just accept it...but we must 1512 * process the init so that we can make sure we have 1513 * the right seq no's. 1514 */ 1515 /* First we must process the INIT !! */ 1516 retval = sctp_process_init(init_cp, stcb); 1517 if (retval < 0) { 1518 if (how_indx < sizeof(asoc->cookie_how)) 1519 asoc->cookie_how[how_indx] = 3; 1520 return (NULL); 1521 } 1522 /* we have already processed the INIT so no problem */ 1523 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, 1524 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_12); 1525 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_13); 1526 /* update current state */ 1527 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) 1528 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1529 else 1530 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1531 1532 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1533 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1534 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1535 stcb->sctp_ep, stcb, asoc->primary_destination); 1536 } 1537 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1538 sctp_stop_all_cookie_timers(stcb); 1539 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1540 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1541 (inp->sctp_socket->so_qlimit == 0) 1542 ) { 1543#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1544 struct socket *so; 1545 1546#endif 1547 /* 1548 * Here is where collision would go if we 1549 * did a connect() and instead got a 1550 * init/init-ack/cookie done before the 1551 * init-ack came back.. 1552 */ 1553 stcb->sctp_ep->sctp_flags |= 1554 SCTP_PCB_FLAGS_CONNECTED; 1555#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1556 so = SCTP_INP_SO(stcb->sctp_ep); 1557 atomic_add_int(&stcb->asoc.refcnt, 1); 1558 SCTP_TCB_UNLOCK(stcb); 1559 SCTP_SOCKET_LOCK(so, 1); 1560 SCTP_TCB_LOCK(stcb); 1561 atomic_add_int(&stcb->asoc.refcnt, -1); 1562 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1563 SCTP_SOCKET_UNLOCK(so, 1); 1564 return (NULL); 1565 } 1566#endif 1567 soisconnected(stcb->sctp_socket); 1568#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1569 SCTP_SOCKET_UNLOCK(so, 1); 1570#endif 1571 } 1572 /* notify upper layer */ 1573 *notification = SCTP_NOTIFY_ASSOC_UP; 1574 /* 1575 * since we did not send a HB make sure we don't 1576 * double things 1577 */ 1578 net->hb_responded = 1; 1579 net->RTO = sctp_calculate_rto(stcb, asoc, net, 1580 &cookie->time_entered, 1581 sctp_align_unsafe_makecopy, 1582 SCTP_RTT_FROM_NON_DATA); 1583 1584 if (stcb->asoc.sctp_autoclose_ticks && 1585 (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) { 1586 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 1587 inp, stcb, NULL); 1588 } 1589 break; 1590 default: 1591 /* 1592 * we're in the OPEN state (or beyond), so peer must 1593 * have simply lost the COOKIE-ACK 1594 */ 1595 break; 1596 } /* end switch */ 1597 sctp_stop_all_cookie_timers(stcb); 1598 /* 1599 * We ignore the return code here.. not sure if we should 1600 * somehow abort.. but we do have an existing asoc. This 1601 * really should not fail. 1602 */ 1603 if (sctp_load_addresses_from_init(stcb, m, 1604 init_offset + sizeof(struct sctp_init_chunk), 1605 initack_offset, sh, init_src)) { 1606 if (how_indx < sizeof(asoc->cookie_how)) 1607 asoc->cookie_how[how_indx] = 4; 1608 return (NULL); 1609 } 1610 /* respond with a COOKIE-ACK */ 1611 sctp_toss_old_cookies(stcb, asoc); 1612 sctp_send_cookie_ack(stcb); 1613 if (how_indx < sizeof(asoc->cookie_how)) 1614 asoc->cookie_how[how_indx] = 5; 1615 return (stcb); 1616 } 1617 if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1618 ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag && 1619 cookie->tie_tag_my_vtag == 0 && 1620 cookie->tie_tag_peer_vtag == 0) { 1621 /* 1622 * case C in Section 5.2.4 Table 2: XMOO silently discard 1623 */ 1624 if (how_indx < sizeof(asoc->cookie_how)) 1625 asoc->cookie_how[how_indx] = 6; 1626 return (NULL); 1627 } 1628 /* 1629 * If nat support, and the below and stcb is established, send back 1630 * a ABORT(colliding state) if we are established. 1631 */ 1632 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) && 1633 (asoc->peer_supports_nat) && 1634 ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1635 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1636 (asoc->peer_vtag == 0)))) { 1637 /* 1638 * Special case - Peer's support nat. We may have two init's 1639 * that we gave out the same tag on since one was not 1640 * established.. i.e. we get INIT from host-1 behind the nat 1641 * and we respond tag-a, we get a INIT from host-2 behind 1642 * the nat and we get tag-a again. Then we bring up host-1 1643 * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1). 1644 * Now we have colliding state. We must send an abort here 1645 * with colliding state indication. 1646 */ 1647 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 1648 0, M_DONTWAIT, 1, MT_DATA); 1649 if (op_err == NULL) { 1650 /* FOOBAR */ 1651 return (NULL); 1652 } 1653 /* pre-reserve some space */ 1654#ifdef INET6 1655 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr)); 1656#else 1657 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip)); 1658#endif 1659 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr)); 1660 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr)); 1661 /* Set the len */ 1662 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_paramhdr); 1663 ph = mtod(op_err, struct sctp_paramhdr *); 1664 ph->param_type = htons(SCTP_CAUSE_NAT_COLLIDING_STATE); 1665 ph->param_length = htons(sizeof(struct sctp_paramhdr)); 1666 sctp_send_abort(m, iphlen, sh, 0, op_err, vrf_id, port); 1667 return (NULL); 1668 } 1669 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1670 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1671 (asoc->peer_vtag == 0))) { 1672 /* 1673 * case B in Section 5.2.4 Table 2: MXAA or MOAA my info 1674 * should be ok, re-accept peer info 1675 */ 1676 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1677 /* 1678 * Extension of case C. If we hit this, then the 1679 * random number generator returned the same vtag 1680 * when we first sent our INIT-ACK and when we later 1681 * sent our INIT. The side with the seq numbers that 1682 * are different will be the one that normnally 1683 * would have hit case C. This in effect "extends" 1684 * our vtags in this collision case to be 64 bits. 1685 * The same collision could occur aka you get both 1686 * vtag and seq number the same twice in a row.. but 1687 * is much less likely. If it did happen then we 1688 * would proceed through and bring up the assoc.. we 1689 * may end up with the wrong stream setup however.. 1690 * which would be bad.. but there is no way to 1691 * tell.. until we send on a stream that does not 1692 * exist :-) 1693 */ 1694 if (how_indx < sizeof(asoc->cookie_how)) 1695 asoc->cookie_how[how_indx] = 7; 1696 1697 return (NULL); 1698 } 1699 if (how_indx < sizeof(asoc->cookie_how)) 1700 asoc->cookie_how[how_indx] = 8; 1701 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_14); 1702 sctp_stop_all_cookie_timers(stcb); 1703 /* 1704 * since we did not send a HB make sure we don't double 1705 * things 1706 */ 1707 net->hb_responded = 1; 1708 if (stcb->asoc.sctp_autoclose_ticks && 1709 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 1710 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, 1711 NULL); 1712 } 1713 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1714 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 1715 1716 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) { 1717 /* 1718 * Ok the peer probably discarded our data (if we 1719 * echoed a cookie+data). So anything on the 1720 * sent_queue should be marked for retransmit, we 1721 * may not get something to kick us so it COULD 1722 * still take a timeout to move these.. but it can't 1723 * hurt to mark them. 1724 */ 1725 struct sctp_tmit_chunk *chk; 1726 1727 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 1728 if (chk->sent < SCTP_DATAGRAM_RESEND) { 1729 chk->sent = SCTP_DATAGRAM_RESEND; 1730 sctp_flight_size_decrease(chk); 1731 sctp_total_flight_decrease(stcb, chk); 1732 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 1733 spec_flag++; 1734 } 1735 } 1736 1737 } 1738 /* process the INIT info (peer's info) */ 1739 retval = sctp_process_init(init_cp, stcb); 1740 if (retval < 0) { 1741 if (how_indx < sizeof(asoc->cookie_how)) 1742 asoc->cookie_how[how_indx] = 9; 1743 return (NULL); 1744 } 1745 if (sctp_load_addresses_from_init(stcb, m, 1746 init_offset + sizeof(struct sctp_init_chunk), 1747 initack_offset, sh, init_src)) { 1748 if (how_indx < sizeof(asoc->cookie_how)) 1749 asoc->cookie_how[how_indx] = 10; 1750 return (NULL); 1751 } 1752 if ((asoc->state & SCTP_STATE_COOKIE_WAIT) || 1753 (asoc->state & SCTP_STATE_COOKIE_ECHOED)) { 1754 *notification = SCTP_NOTIFY_ASSOC_UP; 1755 1756 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1757 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1758 (inp->sctp_socket->so_qlimit == 0)) { 1759#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1760 struct socket *so; 1761 1762#endif 1763 stcb->sctp_ep->sctp_flags |= 1764 SCTP_PCB_FLAGS_CONNECTED; 1765#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1766 so = SCTP_INP_SO(stcb->sctp_ep); 1767 atomic_add_int(&stcb->asoc.refcnt, 1); 1768 SCTP_TCB_UNLOCK(stcb); 1769 SCTP_SOCKET_LOCK(so, 1); 1770 SCTP_TCB_LOCK(stcb); 1771 atomic_add_int(&stcb->asoc.refcnt, -1); 1772 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1773 SCTP_SOCKET_UNLOCK(so, 1); 1774 return (NULL); 1775 } 1776#endif 1777 soisconnected(stcb->sctp_socket); 1778#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1779 SCTP_SOCKET_UNLOCK(so, 1); 1780#endif 1781 } 1782 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) 1783 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1784 else 1785 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1786 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1787 } else if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) { 1788 SCTP_STAT_INCR_COUNTER32(sctps_restartestab); 1789 } else { 1790 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1791 } 1792 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1793 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1794 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1795 stcb->sctp_ep, stcb, asoc->primary_destination); 1796 } 1797 sctp_stop_all_cookie_timers(stcb); 1798 sctp_toss_old_cookies(stcb, asoc); 1799 sctp_send_cookie_ack(stcb); 1800 if (spec_flag) { 1801 /* 1802 * only if we have retrans set do we do this. What 1803 * this call does is get only the COOKIE-ACK out and 1804 * then when we return the normal call to 1805 * sctp_chunk_output will get the retrans out behind 1806 * this. 1807 */ 1808 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED); 1809 } 1810 if (how_indx < sizeof(asoc->cookie_how)) 1811 asoc->cookie_how[how_indx] = 11; 1812 1813 return (stcb); 1814 } 1815 if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1816 ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) && 1817 cookie->tie_tag_my_vtag == asoc->my_vtag_nonce && 1818 cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce && 1819 cookie->tie_tag_peer_vtag != 0) { 1820 struct sctpasochead *head; 1821 1822 if (asoc->peer_supports_nat) { 1823 /* 1824 * This is a gross gross hack. just call the 1825 * cookie_new code since we are allowing a duplicate 1826 * association. I hope this works... 1827 */ 1828 return (sctp_process_cookie_new(m, iphlen, offset, sh, cookie, cookie_len, 1829 inp, netp, init_src, notification, 1830 auth_skipped, auth_offset, auth_len, 1831 vrf_id, port)); 1832 } 1833 /* 1834 * case A in Section 5.2.4 Table 2: XXMM (peer restarted) 1835 */ 1836 /* temp code */ 1837 if (how_indx < sizeof(asoc->cookie_how)) 1838 asoc->cookie_how[how_indx] = 12; 1839 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_15); 1840 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 1841 1842 /* notify upper layer */ 1843 *notification = SCTP_NOTIFY_ASSOC_RESTART; 1844 atomic_add_int(&stcb->asoc.refcnt, 1); 1845 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_OPEN) && 1846 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) && 1847 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) { 1848 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1849 } 1850 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) { 1851 SCTP_STAT_INCR_GAUGE32(sctps_restartestab); 1852 } else if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) { 1853 SCTP_STAT_INCR_GAUGE32(sctps_collisionestab); 1854 } 1855 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1856 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1857 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1858 stcb->sctp_ep, stcb, asoc->primary_destination); 1859 1860 } else if (!(asoc->state & SCTP_STATE_SHUTDOWN_SENT)) { 1861 /* move to OPEN state, if not in SHUTDOWN_SENT */ 1862 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1863 } 1864 asoc->pre_open_streams = 1865 ntohs(initack_cp->init.num_outbound_streams); 1866 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 1867 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 1868 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 1869 1870 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 1871 1872 asoc->str_reset_seq_in = asoc->init_seq_number; 1873 1874 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 1875 if (asoc->mapping_array) { 1876 memset(asoc->mapping_array, 0, 1877 asoc->mapping_array_size); 1878 } 1879 if (asoc->nr_mapping_array) { 1880 memset(asoc->nr_mapping_array, 0, 1881 asoc->mapping_array_size); 1882 } 1883 SCTP_TCB_UNLOCK(stcb); 1884 SCTP_INP_INFO_WLOCK(); 1885 SCTP_INP_WLOCK(stcb->sctp_ep); 1886 SCTP_TCB_LOCK(stcb); 1887 atomic_add_int(&stcb->asoc.refcnt, -1); 1888 /* send up all the data */ 1889 SCTP_TCB_SEND_LOCK(stcb); 1890 1891 sctp_report_all_outbound(stcb, 0, 1, SCTP_SO_NOT_LOCKED); 1892 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 1893 stcb->asoc.strmout[i].stream_no = i; 1894 stcb->asoc.strmout[i].next_sequence_sent = 0; 1895 stcb->asoc.strmout[i].last_msg_incomplete = 0; 1896 } 1897 /* process the INIT-ACK info (my info) */ 1898 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 1899 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1900 1901 /* pull from vtag hash */ 1902 LIST_REMOVE(stcb, sctp_asocs); 1903 /* re-insert to new vtag position */ 1904 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, 1905 SCTP_BASE_INFO(hashasocmark))]; 1906 /* 1907 * put it in the bucket in the vtag hash of assoc's for the 1908 * system 1909 */ 1910 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 1911 1912 /* process the INIT info (peer's info) */ 1913 SCTP_TCB_SEND_UNLOCK(stcb); 1914 SCTP_INP_WUNLOCK(stcb->sctp_ep); 1915 SCTP_INP_INFO_WUNLOCK(); 1916 1917 retval = sctp_process_init(init_cp, stcb); 1918 if (retval < 0) { 1919 if (how_indx < sizeof(asoc->cookie_how)) 1920 asoc->cookie_how[how_indx] = 13; 1921 1922 return (NULL); 1923 } 1924 /* 1925 * since we did not send a HB make sure we don't double 1926 * things 1927 */ 1928 net->hb_responded = 1; 1929 1930 if (sctp_load_addresses_from_init(stcb, m, 1931 init_offset + sizeof(struct sctp_init_chunk), 1932 initack_offset, sh, init_src)) { 1933 if (how_indx < sizeof(asoc->cookie_how)) 1934 asoc->cookie_how[how_indx] = 14; 1935 1936 return (NULL); 1937 } 1938 /* respond with a COOKIE-ACK */ 1939 sctp_stop_all_cookie_timers(stcb); 1940 sctp_toss_old_cookies(stcb, asoc); 1941 sctp_send_cookie_ack(stcb); 1942 if (how_indx < sizeof(asoc->cookie_how)) 1943 asoc->cookie_how[how_indx] = 15; 1944 1945 return (stcb); 1946 } 1947 if (how_indx < sizeof(asoc->cookie_how)) 1948 asoc->cookie_how[how_indx] = 16; 1949 /* all other cases... */ 1950 return (NULL); 1951} 1952 1953 1954/* 1955 * handle a state cookie for a new association m: input packet mbuf chain-- 1956 * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf 1957 * and the cookie signature does not exist offset: offset into mbuf to the 1958 * cookie-echo chunk length: length of the cookie chunk to: where the init 1959 * was from returns a new TCB 1960 */ 1961struct sctp_tcb * 1962sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1963 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1964 struct sctp_inpcb *inp, struct sctp_nets **netp, 1965 struct sockaddr *init_src, int *notification, 1966 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1967 uint32_t vrf_id, uint16_t port) 1968{ 1969 struct sctp_tcb *stcb; 1970 struct sctp_init_chunk *init_cp, init_buf; 1971 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1972 struct sockaddr_storage sa_store; 1973 struct sockaddr *initack_src = (struct sockaddr *)&sa_store; 1974 struct sctp_association *asoc; 1975 int init_offset, initack_offset, initack_limit; 1976 int retval; 1977 int error = 0; 1978 uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE]; 1979 1980#ifdef INET 1981 struct sockaddr_in *sin; 1982 1983#endif 1984#ifdef INET6 1985 struct sockaddr_in6 *sin6; 1986 1987#endif 1988#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1989 struct socket *so; 1990 1991 so = SCTP_INP_SO(inp); 1992#endif 1993 1994 /* 1995 * find and validate the INIT chunk in the cookie (peer's info) the 1996 * INIT should start after the cookie-echo header struct (chunk 1997 * header, state cookie header struct) 1998 */ 1999 init_offset = offset + sizeof(struct sctp_cookie_echo_chunk); 2000 init_cp = (struct sctp_init_chunk *) 2001 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 2002 (uint8_t *) & init_buf); 2003 if (init_cp == NULL) { 2004 /* could not pull a INIT chunk in cookie */ 2005 SCTPDBG(SCTP_DEBUG_INPUT1, 2006 "process_cookie_new: could not pull INIT chunk hdr\n"); 2007 return (NULL); 2008 } 2009 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 2010 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n"); 2011 return (NULL); 2012 } 2013 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 2014 /* 2015 * find and validate the INIT-ACK chunk in the cookie (my info) the 2016 * INIT-ACK follows the INIT chunk 2017 */ 2018 initack_cp = (struct sctp_init_ack_chunk *) 2019 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 2020 (uint8_t *) & initack_buf); 2021 if (initack_cp == NULL) { 2022 /* could not pull INIT-ACK chunk in cookie */ 2023 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n"); 2024 return (NULL); 2025 } 2026 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 2027 return (NULL); 2028 } 2029 /* 2030 * NOTE: We can't use the INIT_ACK's chk_length to determine the 2031 * "initack_limit" value. This is because the chk_length field 2032 * includes the length of the cookie, but the cookie is omitted when 2033 * the INIT and INIT_ACK are tacked onto the cookie... 2034 */ 2035 initack_limit = offset + cookie_len; 2036 2037 /* 2038 * now that we know the INIT/INIT-ACK are in place, create a new TCB 2039 * and popluate 2040 */ 2041 2042 /* 2043 * Here we do a trick, we set in NULL for the proc/thread argument. 2044 * We do this since in effect we only use the p argument when the 2045 * socket is unbound and we must do an implicit bind. Since we are 2046 * getting a cookie, we cannot be unbound. 2047 */ 2048 stcb = sctp_aloc_assoc(inp, init_src, &error, 2049 ntohl(initack_cp->init.initiate_tag), vrf_id, 2050 (struct thread *)NULL 2051 ); 2052 if (stcb == NULL) { 2053 struct mbuf *op_err; 2054 2055 /* memory problem? */ 2056 SCTPDBG(SCTP_DEBUG_INPUT1, 2057 "process_cookie_new: no room for another TCB!\n"); 2058 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC); 2059 2060 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2061 sh, op_err, vrf_id, port); 2062 return (NULL); 2063 } 2064 /* get the correct sctp_nets */ 2065 if (netp) 2066 *netp = sctp_findnet(stcb, init_src); 2067 2068 asoc = &stcb->asoc; 2069 /* get scope variables out of cookie */ 2070 asoc->ipv4_local_scope = cookie->ipv4_scope; 2071 asoc->site_scope = cookie->site_scope; 2072 asoc->local_scope = cookie->local_scope; 2073 asoc->loopback_scope = cookie->loopback_scope; 2074 2075 if ((asoc->ipv4_addr_legal != cookie->ipv4_addr_legal) || 2076 (asoc->ipv6_addr_legal != cookie->ipv6_addr_legal)) { 2077 struct mbuf *op_err; 2078 2079 /* 2080 * Houston we have a problem. The EP changed while the 2081 * cookie was in flight. Only recourse is to abort the 2082 * association. 2083 */ 2084 atomic_add_int(&stcb->asoc.refcnt, 1); 2085 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC); 2086 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2087 sh, op_err, vrf_id, port); 2088#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2089 SCTP_TCB_UNLOCK(stcb); 2090 SCTP_SOCKET_LOCK(so, 1); 2091 SCTP_TCB_LOCK(stcb); 2092#endif 2093 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2094 SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 2095#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2096 SCTP_SOCKET_UNLOCK(so, 1); 2097#endif 2098 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2099 return (NULL); 2100 } 2101 /* process the INIT-ACK info (my info) */ 2102 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 2103 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 2104 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 2105 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 2106 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 2107 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 2108 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 2109 asoc->str_reset_seq_in = asoc->init_seq_number; 2110 2111 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 2112 2113 /* process the INIT info (peer's info) */ 2114 if (netp) 2115 retval = sctp_process_init(init_cp, stcb); 2116 else 2117 retval = 0; 2118 if (retval < 0) { 2119 atomic_add_int(&stcb->asoc.refcnt, 1); 2120#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2121 SCTP_TCB_UNLOCK(stcb); 2122 SCTP_SOCKET_LOCK(so, 1); 2123 SCTP_TCB_LOCK(stcb); 2124#endif 2125 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 2126#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2127 SCTP_SOCKET_UNLOCK(so, 1); 2128#endif 2129 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2130 return (NULL); 2131 } 2132 /* load all addresses */ 2133 if (sctp_load_addresses_from_init(stcb, m, 2134 init_offset + sizeof(struct sctp_init_chunk), initack_offset, sh, 2135 init_src)) { 2136 atomic_add_int(&stcb->asoc.refcnt, 1); 2137#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2138 SCTP_TCB_UNLOCK(stcb); 2139 SCTP_SOCKET_LOCK(so, 1); 2140 SCTP_TCB_LOCK(stcb); 2141#endif 2142 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_17); 2143#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2144 SCTP_SOCKET_UNLOCK(so, 1); 2145#endif 2146 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2147 return (NULL); 2148 } 2149 /* 2150 * verify any preceding AUTH chunk that was skipped 2151 */ 2152 /* pull the local authentication parameters from the cookie/init-ack */ 2153 sctp_auth_get_cookie_params(stcb, m, 2154 initack_offset + sizeof(struct sctp_init_ack_chunk), 2155 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk))); 2156 if (auth_skipped) { 2157 struct sctp_auth_chunk *auth; 2158 2159 auth = (struct sctp_auth_chunk *) 2160 sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf); 2161 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) { 2162 /* auth HMAC failed, dump the assoc and packet */ 2163 SCTPDBG(SCTP_DEBUG_AUTH1, 2164 "COOKIE-ECHO: AUTH failed\n"); 2165 atomic_add_int(&stcb->asoc.refcnt, 1); 2166#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2167 SCTP_TCB_UNLOCK(stcb); 2168 SCTP_SOCKET_LOCK(so, 1); 2169 SCTP_TCB_LOCK(stcb); 2170#endif 2171 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_18); 2172#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2173 SCTP_SOCKET_UNLOCK(so, 1); 2174#endif 2175 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2176 return (NULL); 2177 } else { 2178 /* remaining chunks checked... good to go */ 2179 stcb->asoc.authenticated = 1; 2180 } 2181 } 2182 /* update current state */ 2183 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2184 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 2185 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2186 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2187 stcb->sctp_ep, stcb, asoc->primary_destination); 2188 } 2189 sctp_stop_all_cookie_timers(stcb); 2190 SCTP_STAT_INCR_COUNTER32(sctps_passiveestab); 2191 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2192 2193 /* 2194 * if we're doing ASCONFs, check to see if we have any new local 2195 * addresses that need to get added to the peer (eg. addresses 2196 * changed while cookie echo in flight). This needs to be done 2197 * after we go to the OPEN state to do the correct asconf 2198 * processing. else, make sure we have the correct addresses in our 2199 * lists 2200 */ 2201 2202 /* warning, we re-use sin, sin6, sa_store here! */ 2203 /* pull in local_address (our "from" address) */ 2204 switch (cookie->laddr_type) { 2205#ifdef INET 2206 case SCTP_IPV4_ADDRESS: 2207 /* source addr is IPv4 */ 2208 sin = (struct sockaddr_in *)initack_src; 2209 memset(sin, 0, sizeof(*sin)); 2210 sin->sin_family = AF_INET; 2211 sin->sin_len = sizeof(struct sockaddr_in); 2212 sin->sin_addr.s_addr = cookie->laddress[0]; 2213 break; 2214#endif 2215#ifdef INET6 2216 case SCTP_IPV6_ADDRESS: 2217 /* source addr is IPv6 */ 2218 sin6 = (struct sockaddr_in6 *)initack_src; 2219 memset(sin6, 0, sizeof(*sin6)); 2220 sin6->sin6_family = AF_INET6; 2221 sin6->sin6_len = sizeof(struct sockaddr_in6); 2222 sin6->sin6_scope_id = cookie->scope_id; 2223 memcpy(&sin6->sin6_addr, cookie->laddress, 2224 sizeof(sin6->sin6_addr)); 2225 break; 2226#endif 2227 default: 2228 atomic_add_int(&stcb->asoc.refcnt, 1); 2229#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2230 SCTP_TCB_UNLOCK(stcb); 2231 SCTP_SOCKET_LOCK(so, 1); 2232 SCTP_TCB_LOCK(stcb); 2233#endif 2234 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_19); 2235#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2236 SCTP_SOCKET_UNLOCK(so, 1); 2237#endif 2238 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2239 return (NULL); 2240 } 2241 2242 /* set up to notify upper layer */ 2243 *notification = SCTP_NOTIFY_ASSOC_UP; 2244 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2245 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 2246 (inp->sctp_socket->so_qlimit == 0)) { 2247 /* 2248 * This is an endpoint that called connect() how it got a 2249 * cookie that is NEW is a bit of a mystery. It must be that 2250 * the INIT was sent, but before it got there.. a complete 2251 * INIT/INIT-ACK/COOKIE arrived. But of course then it 2252 * should have went to the other code.. not here.. oh well.. 2253 * a bit of protection is worth having.. 2254 */ 2255 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2256#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2257 atomic_add_int(&stcb->asoc.refcnt, 1); 2258 SCTP_TCB_UNLOCK(stcb); 2259 SCTP_SOCKET_LOCK(so, 1); 2260 SCTP_TCB_LOCK(stcb); 2261 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2262 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2263 SCTP_SOCKET_UNLOCK(so, 1); 2264 return (NULL); 2265 } 2266#endif 2267 soisconnected(stcb->sctp_socket); 2268#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2269 SCTP_SOCKET_UNLOCK(so, 1); 2270#endif 2271 } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 2272 (inp->sctp_socket->so_qlimit)) { 2273 /* 2274 * We don't want to do anything with this one. Since it is 2275 * the listening guy. The timer will get started for 2276 * accepted connections in the caller. 2277 */ 2278 ; 2279 } 2280 /* since we did not send a HB make sure we don't double things */ 2281 if ((netp) && (*netp)) 2282 (*netp)->hb_responded = 1; 2283 2284 if (stcb->asoc.sctp_autoclose_ticks && 2285 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2286 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL); 2287 } 2288 /* calculate the RTT */ 2289 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 2290 if ((netp) && (*netp)) { 2291 (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp, 2292 &cookie->time_entered, sctp_align_unsafe_makecopy, 2293 SCTP_RTT_FROM_NON_DATA); 2294 } 2295 /* respond with a COOKIE-ACK */ 2296 sctp_send_cookie_ack(stcb); 2297 2298 /* 2299 * check the address lists for any ASCONFs that need to be sent 2300 * AFTER the cookie-ack is sent 2301 */ 2302 sctp_check_address_list(stcb, m, 2303 initack_offset + sizeof(struct sctp_init_ack_chunk), 2304 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)), 2305 initack_src, cookie->local_scope, cookie->site_scope, 2306 cookie->ipv4_scope, cookie->loopback_scope); 2307 2308 2309 return (stcb); 2310} 2311 2312/* 2313 * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e 2314 * we NEED to make sure we are not already using the vtag. If so we 2315 * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit! 2316 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag, 2317 SCTP_BASE_INFO(hashasocmark))]; 2318 LIST_FOREACH(stcb, head, sctp_asocs) { 2319 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep)) { 2320 -- SEND ABORT - TRY AGAIN -- 2321 } 2322 } 2323*/ 2324 2325/* 2326 * handles a COOKIE-ECHO message stcb: modified to either a new or left as 2327 * existing (non-NULL) TCB 2328 */ 2329static struct mbuf * 2330sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset, 2331 struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp, 2332 struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp, 2333 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2334 struct sctp_tcb **locked_tcb, uint32_t vrf_id, uint16_t port) 2335{ 2336 struct sctp_state_cookie *cookie; 2337 struct sctp_tcb *l_stcb = *stcb; 2338 struct sctp_inpcb *l_inp; 2339 struct sockaddr *to; 2340 struct sctp_pcb *ep; 2341 struct mbuf *m_sig; 2342 uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE]; 2343 uint8_t *sig; 2344 uint8_t cookie_ok = 0; 2345 unsigned int size_of_pkt, sig_offset, cookie_offset; 2346 unsigned int cookie_len; 2347 struct timeval now; 2348 struct timeval time_expires; 2349 struct sockaddr_storage dest_store; 2350 struct sockaddr *localep_sa = (struct sockaddr *)&dest_store; 2351 struct ip *iph; 2352 int notification = 0; 2353 struct sctp_nets *netl; 2354 int had_a_existing_tcb = 0; 2355 int send_int_conf = 0; 2356 2357#ifdef INET 2358 struct sockaddr_in sin; 2359 2360#endif 2361#ifdef INET6 2362 struct sockaddr_in6 sin6; 2363 2364#endif 2365 2366 SCTPDBG(SCTP_DEBUG_INPUT2, 2367 "sctp_handle_cookie: handling COOKIE-ECHO\n"); 2368 2369 if (inp_p == NULL) { 2370 return (NULL); 2371 } 2372 /* First get the destination address setup too. */ 2373 iph = mtod(m, struct ip *); 2374 switch (iph->ip_v) { 2375#ifdef INET 2376 case IPVERSION: 2377 { 2378 /* its IPv4 */ 2379 struct sockaddr_in *lsin; 2380 2381 lsin = (struct sockaddr_in *)(localep_sa); 2382 memset(lsin, 0, sizeof(*lsin)); 2383 lsin->sin_family = AF_INET; 2384 lsin->sin_len = sizeof(*lsin); 2385 lsin->sin_port = sh->dest_port; 2386 lsin->sin_addr.s_addr = iph->ip_dst.s_addr; 2387 size_of_pkt = SCTP_GET_IPV4_LENGTH(iph); 2388 break; 2389 } 2390#endif 2391#ifdef INET6 2392 case IPV6_VERSION >> 4: 2393 { 2394 /* its IPv6 */ 2395 struct ip6_hdr *ip6; 2396 struct sockaddr_in6 *lsin6; 2397 2398 lsin6 = (struct sockaddr_in6 *)(localep_sa); 2399 memset(lsin6, 0, sizeof(*lsin6)); 2400 lsin6->sin6_family = AF_INET6; 2401 lsin6->sin6_len = sizeof(struct sockaddr_in6); 2402 ip6 = mtod(m, struct ip6_hdr *); 2403 lsin6->sin6_port = sh->dest_port; 2404 lsin6->sin6_addr = ip6->ip6_dst; 2405 size_of_pkt = SCTP_GET_IPV6_LENGTH(ip6) + iphlen; 2406 break; 2407 } 2408#endif 2409 default: 2410 return (NULL); 2411 } 2412 2413 cookie = &cp->cookie; 2414 cookie_offset = offset + sizeof(struct sctp_chunkhdr); 2415 cookie_len = ntohs(cp->ch.chunk_length); 2416 2417 if ((cookie->peerport != sh->src_port) && 2418 (cookie->myport != sh->dest_port) && 2419 (cookie->my_vtag != sh->v_tag)) { 2420 /* 2421 * invalid ports or bad tag. Note that we always leave the 2422 * v_tag in the header in network order and when we stored 2423 * it in the my_vtag slot we also left it in network order. 2424 * This maintains the match even though it may be in the 2425 * opposite byte order of the machine :-> 2426 */ 2427 return (NULL); 2428 } 2429 if (cookie_len > size_of_pkt || 2430 cookie_len < sizeof(struct sctp_cookie_echo_chunk) + 2431 sizeof(struct sctp_init_chunk) + 2432 sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) { 2433 /* cookie too long! or too small */ 2434 return (NULL); 2435 } 2436 /* 2437 * split off the signature into its own mbuf (since it should not be 2438 * calculated in the sctp_hmac_m() call). 2439 */ 2440 sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE; 2441 if (sig_offset > size_of_pkt) { 2442 /* packet not correct size! */ 2443 /* XXX this may already be accounted for earlier... */ 2444 return (NULL); 2445 } 2446 m_sig = m_split(m, sig_offset, M_DONTWAIT); 2447 if (m_sig == NULL) { 2448 /* out of memory or ?? */ 2449 return (NULL); 2450 } 2451#ifdef SCTP_MBUF_LOGGING 2452 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 2453 struct mbuf *mat; 2454 2455 for (mat = m_sig; mat; mat = SCTP_BUF_NEXT(mat)) { 2456 if (SCTP_BUF_IS_EXTENDED(mat)) { 2457 sctp_log_mb(mat, SCTP_MBUF_SPLIT); 2458 } 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, 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 if (sctp_add_remote_addr(*stcb, to, NULL, SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) { 2687 return (NULL); 2688 } 2689 netl = sctp_findnet(*stcb, to); 2690 } 2691 if (netl) { 2692 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) { 2693 netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 2694 (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL, 2695 netl); 2696 send_int_conf = 1; 2697 } 2698 } 2699 sctp_start_net_timers(*stcb); 2700 if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) { 2701 if (!had_a_existing_tcb || 2702 (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) { 2703 /* 2704 * If we have a NEW cookie or the connect never 2705 * reached the connected state during collision we 2706 * must do the TCP accept thing. 2707 */ 2708 struct socket *so, *oso; 2709 struct sctp_inpcb *inp; 2710 2711 if (notification == SCTP_NOTIFY_ASSOC_RESTART) { 2712 /* 2713 * For a restart we will keep the same 2714 * socket, no need to do anything. I THINK!! 2715 */ 2716 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2717 if (send_int_conf) { 2718 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2719 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2720 } 2721 return (m); 2722 } 2723 oso = (*inp_p)->sctp_socket; 2724 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2725 SCTP_TCB_UNLOCK((*stcb)); 2726 CURVNET_SET(oso->so_vnet); 2727 so = sonewconn(oso, 0 2728 ); 2729 CURVNET_RESTORE(); 2730 SCTP_TCB_LOCK((*stcb)); 2731 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2732 2733 if (so == NULL) { 2734 struct mbuf *op_err; 2735 2736#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2737 struct socket *pcb_so; 2738 2739#endif 2740 /* Too many sockets */ 2741 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n"); 2742 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC); 2743 sctp_abort_association(*inp_p, NULL, m, iphlen, 2744 sh, op_err, vrf_id, port); 2745#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2746 pcb_so = SCTP_INP_SO(*inp_p); 2747 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2748 SCTP_TCB_UNLOCK((*stcb)); 2749 SCTP_SOCKET_LOCK(pcb_so, 1); 2750 SCTP_TCB_LOCK((*stcb)); 2751 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2752#endif 2753 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_20); 2754#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2755 SCTP_SOCKET_UNLOCK(pcb_so, 1); 2756#endif 2757 return (NULL); 2758 } 2759 inp = (struct sctp_inpcb *)so->so_pcb; 2760 SCTP_INP_INCR_REF(inp); 2761 /* 2762 * We add the unbound flag here so that if we get an 2763 * soabort() before we get the move_pcb done, we 2764 * will properly cleanup. 2765 */ 2766 inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE | 2767 SCTP_PCB_FLAGS_CONNECTED | 2768 SCTP_PCB_FLAGS_IN_TCPPOOL | 2769 SCTP_PCB_FLAGS_UNBOUND | 2770 (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) | 2771 SCTP_PCB_FLAGS_DONT_WAKE); 2772 inp->sctp_features = (*inp_p)->sctp_features; 2773 inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features; 2774 inp->sctp_socket = so; 2775 inp->sctp_frag_point = (*inp_p)->sctp_frag_point; 2776 inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off; 2777 inp->sctp_ecn_enable = (*inp_p)->sctp_ecn_enable; 2778 inp->partial_delivery_point = (*inp_p)->partial_delivery_point; 2779 inp->sctp_context = (*inp_p)->sctp_context; 2780 inp->local_strreset_support = (*inp_p)->local_strreset_support; 2781 inp->inp_starting_point_for_iterator = NULL; 2782 /* 2783 * copy in the authentication parameters from the 2784 * original endpoint 2785 */ 2786 if (inp->sctp_ep.local_hmacs) 2787 sctp_free_hmaclist(inp->sctp_ep.local_hmacs); 2788 inp->sctp_ep.local_hmacs = 2789 sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs); 2790 if (inp->sctp_ep.local_auth_chunks) 2791 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks); 2792 inp->sctp_ep.local_auth_chunks = 2793 sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks); 2794 2795 /* 2796 * Now we must move it from one hash table to 2797 * another and get the tcb in the right place. 2798 */ 2799 2800 /* 2801 * This is where the one-2-one socket is put into 2802 * the accept state waiting for the accept! 2803 */ 2804 if (*stcb) { 2805 (*stcb)->asoc.state |= SCTP_STATE_IN_ACCEPT_QUEUE; 2806 } 2807 sctp_move_pcb_and_assoc(*inp_p, inp, *stcb); 2808 2809 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2810 SCTP_TCB_UNLOCK((*stcb)); 2811 2812 sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb, 2813 0); 2814 SCTP_TCB_LOCK((*stcb)); 2815 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2816 2817 2818 /* 2819 * now we must check to see if we were aborted while 2820 * the move was going on and the lock/unlock 2821 * happened. 2822 */ 2823 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 2824 /* 2825 * yep it was, we leave the assoc attached 2826 * to the socket since the sctp_inpcb_free() 2827 * call will send an abort for us. 2828 */ 2829 SCTP_INP_DECR_REF(inp); 2830 return (NULL); 2831 } 2832 SCTP_INP_DECR_REF(inp); 2833 /* Switch over to the new guy */ 2834 *inp_p = inp; 2835 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2836 if (send_int_conf) { 2837 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2838 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2839 } 2840 /* 2841 * Pull it from the incomplete queue and wake the 2842 * guy 2843 */ 2844#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2845 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2846 SCTP_TCB_UNLOCK((*stcb)); 2847 SCTP_SOCKET_LOCK(so, 1); 2848#endif 2849 soisconnected(so); 2850#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2851 SCTP_TCB_LOCK((*stcb)); 2852 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2853 SCTP_SOCKET_UNLOCK(so, 1); 2854#endif 2855 return (m); 2856 } 2857 } 2858 if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE) { 2859 if (notification) { 2860 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2861 } 2862 if (send_int_conf) { 2863 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2864 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2865 } 2866 } 2867 return (m); 2868} 2869 2870static void 2871sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED, 2872 struct sctp_tcb *stcb, struct sctp_nets *net) 2873{ 2874 /* cp must not be used, others call this without a c-ack :-) */ 2875 struct sctp_association *asoc; 2876 2877 SCTPDBG(SCTP_DEBUG_INPUT2, 2878 "sctp_handle_cookie_ack: handling COOKIE-ACK\n"); 2879 if (stcb == NULL) 2880 return; 2881 2882 asoc = &stcb->asoc; 2883 2884 sctp_stop_all_cookie_timers(stcb); 2885 /* process according to association state */ 2886 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) { 2887 /* state change only needed when I am in right state */ 2888 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2889 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 2890 sctp_start_net_timers(stcb); 2891 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2892 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2893 stcb->sctp_ep, stcb, asoc->primary_destination); 2894 2895 } 2896 /* update RTO */ 2897 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 2898 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2899 if (asoc->overall_error_count == 0) { 2900 net->RTO = sctp_calculate_rto(stcb, asoc, net, 2901 &asoc->time_entered, sctp_align_safe_nocopy, 2902 SCTP_RTT_FROM_NON_DATA); 2903 } 2904 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 2905 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2906 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2907 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 2908#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2909 struct socket *so; 2910 2911#endif 2912 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2913#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2914 so = SCTP_INP_SO(stcb->sctp_ep); 2915 atomic_add_int(&stcb->asoc.refcnt, 1); 2916 SCTP_TCB_UNLOCK(stcb); 2917 SCTP_SOCKET_LOCK(so, 1); 2918 SCTP_TCB_LOCK(stcb); 2919 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2920#endif 2921 if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) { 2922 soisconnected(stcb->sctp_socket); 2923 } 2924#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2925 SCTP_SOCKET_UNLOCK(so, 1); 2926#endif 2927 } 2928 /* 2929 * since we did not send a HB make sure we don't double 2930 * things 2931 */ 2932 net->hb_responded = 1; 2933 2934 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2935 /* 2936 * We don't need to do the asconf thing, nor hb or 2937 * autoclose if the socket is closed. 2938 */ 2939 goto closed_socket; 2940 } 2941 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 2942 stcb, net); 2943 2944 2945 if (stcb->asoc.sctp_autoclose_ticks && 2946 sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2947 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 2948 stcb->sctp_ep, stcb, NULL); 2949 } 2950 /* 2951 * send ASCONF if parameters are pending and ASCONFs are 2952 * allowed (eg. addresses changed when init/cookie echo were 2953 * in flight) 2954 */ 2955 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) && 2956 (stcb->asoc.peer_supports_asconf) && 2957 (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) { 2958#ifdef SCTP_TIMER_BASED_ASCONF 2959 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, 2960 stcb->sctp_ep, stcb, 2961 stcb->asoc.primary_destination); 2962#else 2963 sctp_send_asconf(stcb, stcb->asoc.primary_destination, 2964 SCTP_ADDR_NOT_LOCKED); 2965#endif 2966 } 2967 } 2968closed_socket: 2969 /* Toss the cookie if I can */ 2970 sctp_toss_old_cookies(stcb, asoc); 2971 if (!TAILQ_EMPTY(&asoc->sent_queue)) { 2972 /* Restart the timer if we have pending data */ 2973 struct sctp_tmit_chunk *chk; 2974 2975 chk = TAILQ_FIRST(&asoc->sent_queue); 2976 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 2977 } 2978} 2979 2980static void 2981sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp, 2982 struct sctp_tcb *stcb) 2983{ 2984 struct sctp_nets *net; 2985 struct sctp_tmit_chunk *lchk; 2986 struct sctp_ecne_chunk bkup; 2987 uint8_t override_bit; 2988 uint32_t tsn, window_data_tsn; 2989 int len; 2990 unsigned int pkt_cnt; 2991 2992 len = ntohs(cp->ch.chunk_length); 2993 if ((len != sizeof(struct sctp_ecne_chunk)) && 2994 (len != sizeof(struct old_sctp_ecne_chunk))) { 2995 return; 2996 } 2997 if (len == sizeof(struct old_sctp_ecne_chunk)) { 2998 /* Its the old format */ 2999 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk)); 3000 bkup.num_pkts_since_cwr = htonl(1); 3001 cp = &bkup; 3002 } 3003 SCTP_STAT_INCR(sctps_recvecne); 3004 tsn = ntohl(cp->tsn); 3005 pkt_cnt = ntohl(cp->num_pkts_since_cwr); 3006 lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead); 3007 if (lchk == NULL) { 3008 window_data_tsn = stcb->asoc.sending_seq - 1; 3009 } else { 3010 window_data_tsn = lchk->rec.data.TSN_seq; 3011 } 3012 3013 /* Find where it was sent to if possible. */ 3014 net = NULL; 3015 TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) { 3016 if (lchk->rec.data.TSN_seq == tsn) { 3017 net = lchk->whoTo; 3018 net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send; 3019 break; 3020 } 3021 if (SCTP_TSN_GT(lchk->rec.data.TSN_seq, tsn)) { 3022 break; 3023 } 3024 } 3025 if (net == NULL) { 3026 /* 3027 * What to do. A previous send of a CWR was possibly lost. 3028 * See how old it is, we may have it marked on the actual 3029 * net. 3030 */ 3031 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 3032 if (tsn == net->last_cwr_tsn) { 3033 /* Found him, send it off */ 3034 break; 3035 } 3036 } 3037 if (net == NULL) { 3038 /* 3039 * If we reach here, we need to send a special CWR 3040 * that says hey, we did this a long time ago and 3041 * you lost the response. 3042 */ 3043 net = TAILQ_FIRST(&stcb->asoc.nets); 3044 if (net == NULL) { 3045 /* TSNH */ 3046 return; 3047 } 3048 override_bit = SCTP_CWR_REDUCE_OVERRIDE; 3049 } else { 3050 override_bit = 0; 3051 } 3052 } else { 3053 override_bit = 0; 3054 } 3055 if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) && 3056 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 3057 /* 3058 * JRS - Use the congestion control given in the pluggable 3059 * CC module 3060 */ 3061 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt); 3062 /* 3063 * We reduce once every RTT. So we will only lower cwnd at 3064 * the next sending seq i.e. the window_data_tsn 3065 */ 3066 net->cwr_window_tsn = window_data_tsn; 3067 net->ecn_ce_pkt_cnt += pkt_cnt; 3068 net->lost_cnt = pkt_cnt; 3069 net->last_cwr_tsn = tsn; 3070 } else { 3071 override_bit |= SCTP_CWR_IN_SAME_WINDOW; 3072 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) && 3073 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 3074 /* 3075 * Another loss in the same window update how many 3076 * marks/packets lost we have had. 3077 */ 3078 int cnt = 1; 3079 3080 if (pkt_cnt > net->lost_cnt) { 3081 /* Should be the case */ 3082 cnt = (pkt_cnt - net->lost_cnt); 3083 net->ecn_ce_pkt_cnt += cnt; 3084 } 3085 net->lost_cnt = pkt_cnt; 3086 net->last_cwr_tsn = tsn; 3087 /* 3088 * Most CC functions will ignore this call, since we 3089 * are in-window yet of the initial CE the peer saw. 3090 */ 3091 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt); 3092 } 3093 } 3094 /* 3095 * We always send a CWR this way if our previous one was lost our 3096 * peer will get an update, or if it is not time again to reduce we 3097 * still get the cwr to the peer. Note we set the override when we 3098 * could not find the TSN on the chunk or the destination network. 3099 */ 3100 sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit); 3101} 3102 3103static void 3104sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net) 3105{ 3106 /* 3107 * Here we get a CWR from the peer. We must look in the outqueue and 3108 * make sure that we have a covered ECNE in teh control chunk part. 3109 * If so remove it. 3110 */ 3111 struct sctp_tmit_chunk *chk; 3112 struct sctp_ecne_chunk *ecne; 3113 int override; 3114 uint32_t cwr_tsn; 3115 3116 cwr_tsn = ntohl(cp->tsn); 3117 3118 override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE; 3119 TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) { 3120 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) { 3121 continue; 3122 } 3123 if ((override == 0) && (chk->whoTo != net)) { 3124 /* Must be from the right src unless override is set */ 3125 continue; 3126 } 3127 ecne = mtod(chk->data, struct sctp_ecne_chunk *); 3128 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) { 3129 /* this covers this ECNE, we can remove it */ 3130 stcb->asoc.ecn_echo_cnt_onq--; 3131 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, 3132 sctp_next); 3133 if (chk->data) { 3134 sctp_m_freem(chk->data); 3135 chk->data = NULL; 3136 } 3137 stcb->asoc.ctrl_queue_cnt--; 3138 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3139 if (override == 0) { 3140 break; 3141 } 3142 } 3143 } 3144} 3145 3146static void 3147sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED, 3148 struct sctp_tcb *stcb, struct sctp_nets *net) 3149{ 3150 struct sctp_association *asoc; 3151 3152#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3153 struct socket *so; 3154 3155#endif 3156 3157 SCTPDBG(SCTP_DEBUG_INPUT2, 3158 "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n"); 3159 if (stcb == NULL) 3160 return; 3161 3162 asoc = &stcb->asoc; 3163 /* process according to association state */ 3164 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 3165 /* unexpected SHUTDOWN-COMPLETE... so ignore... */ 3166 SCTPDBG(SCTP_DEBUG_INPUT2, 3167 "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n"); 3168 SCTP_TCB_UNLOCK(stcb); 3169 return; 3170 } 3171 /* notify upper layer protocol */ 3172 if (stcb->sctp_socket) { 3173 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 3174 /* are the queues empty? they should be */ 3175 if (!TAILQ_EMPTY(&asoc->send_queue) || 3176 !TAILQ_EMPTY(&asoc->sent_queue) || 3177 !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 3178 sctp_report_all_outbound(stcb, 0, 0, SCTP_SO_NOT_LOCKED); 3179 } 3180 } 3181 /* stop the timer */ 3182 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_22); 3183 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 3184 /* free the TCB */ 3185 SCTPDBG(SCTP_DEBUG_INPUT2, 3186 "sctp_handle_shutdown_complete: calls free-asoc\n"); 3187#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3188 so = SCTP_INP_SO(stcb->sctp_ep); 3189 atomic_add_int(&stcb->asoc.refcnt, 1); 3190 SCTP_TCB_UNLOCK(stcb); 3191 SCTP_SOCKET_LOCK(so, 1); 3192 SCTP_TCB_LOCK(stcb); 3193 atomic_subtract_int(&stcb->asoc.refcnt, 1); 3194#endif 3195 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_23); 3196#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3197 SCTP_SOCKET_UNLOCK(so, 1); 3198#endif 3199 return; 3200} 3201 3202static int 3203process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc, 3204 struct sctp_nets *net, uint8_t flg) 3205{ 3206 switch (desc->chunk_type) { 3207 case SCTP_DATA: 3208 /* find the tsn to resend (possibly */ 3209 { 3210 uint32_t tsn; 3211 struct sctp_tmit_chunk *tp1; 3212 3213 tsn = ntohl(desc->tsn_ifany); 3214 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3215 if (tp1->rec.data.TSN_seq == tsn) { 3216 /* found it */ 3217 break; 3218 } 3219 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, tsn)) { 3220 /* not found */ 3221 tp1 = NULL; 3222 break; 3223 } 3224 } 3225 if (tp1 == NULL) { 3226 /* 3227 * Do it the other way , aka without paying 3228 * attention to queue seq order. 3229 */ 3230 SCTP_STAT_INCR(sctps_pdrpdnfnd); 3231 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3232 if (tp1->rec.data.TSN_seq == tsn) { 3233 /* found it */ 3234 break; 3235 } 3236 } 3237 } 3238 if (tp1 == NULL) { 3239 SCTP_STAT_INCR(sctps_pdrptsnnf); 3240 } 3241 if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) { 3242 uint8_t *ddp; 3243 3244 if (((flg & SCTP_BADCRC) == 0) && 3245 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3246 return (0); 3247 } 3248 if ((stcb->asoc.peers_rwnd == 0) && 3249 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3250 SCTP_STAT_INCR(sctps_pdrpdiwnp); 3251 return (0); 3252 } 3253 if (stcb->asoc.peers_rwnd == 0 && 3254 (flg & SCTP_FROM_MIDDLE_BOX)) { 3255 SCTP_STAT_INCR(sctps_pdrpdizrw); 3256 return (0); 3257 } 3258 ddp = (uint8_t *) (mtod(tp1->data, caddr_t)+ 3259 sizeof(struct sctp_data_chunk)); 3260 { 3261 unsigned int iii; 3262 3263 for (iii = 0; iii < sizeof(desc->data_bytes); 3264 iii++) { 3265 if (ddp[iii] != desc->data_bytes[iii]) { 3266 SCTP_STAT_INCR(sctps_pdrpbadd); 3267 return (-1); 3268 } 3269 } 3270 } 3271 3272 if (tp1->do_rtt) { 3273 /* 3274 * this guy had a RTO calculation 3275 * pending on it, cancel it 3276 */ 3277 if (tp1->whoTo->rto_needed == 0) { 3278 tp1->whoTo->rto_needed = 1; 3279 } 3280 tp1->do_rtt = 0; 3281 } 3282 SCTP_STAT_INCR(sctps_pdrpmark); 3283 if (tp1->sent != SCTP_DATAGRAM_RESEND) 3284 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3285 /* 3286 * mark it as if we were doing a FR, since 3287 * we will be getting gap ack reports behind 3288 * the info from the router. 3289 */ 3290 tp1->rec.data.doing_fast_retransmit = 1; 3291 /* 3292 * mark the tsn with what sequences can 3293 * cause a new FR. 3294 */ 3295 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) { 3296 tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq; 3297 } else { 3298 tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq; 3299 } 3300 3301 /* restart the timer */ 3302 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3303 stcb, tp1->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_24); 3304 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3305 stcb, tp1->whoTo); 3306 3307 /* fix counts and things */ 3308 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 3309 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP, 3310 tp1->whoTo->flight_size, 3311 tp1->book_size, 3312 (uintptr_t) stcb, 3313 tp1->rec.data.TSN_seq); 3314 } 3315 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3316 sctp_flight_size_decrease(tp1); 3317 sctp_total_flight_decrease(stcb, tp1); 3318 } 3319 tp1->sent = SCTP_DATAGRAM_RESEND; 3320 } { 3321 /* audit code */ 3322 unsigned int audit; 3323 3324 audit = 0; 3325 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3326 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3327 audit++; 3328 } 3329 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue, 3330 sctp_next) { 3331 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3332 audit++; 3333 } 3334 if (audit != stcb->asoc.sent_queue_retran_cnt) { 3335 SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n", 3336 audit, stcb->asoc.sent_queue_retran_cnt); 3337#ifndef SCTP_AUDITING_ENABLED 3338 stcb->asoc.sent_queue_retran_cnt = audit; 3339#endif 3340 } 3341 } 3342 } 3343 break; 3344 case SCTP_ASCONF: 3345 { 3346 struct sctp_tmit_chunk *asconf; 3347 3348 TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue, 3349 sctp_next) { 3350 if (asconf->rec.chunk_id.id == SCTP_ASCONF) { 3351 break; 3352 } 3353 } 3354 if (asconf) { 3355 if (asconf->sent != SCTP_DATAGRAM_RESEND) 3356 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3357 asconf->sent = SCTP_DATAGRAM_RESEND; 3358 asconf->snd_count--; 3359 } 3360 } 3361 break; 3362 case SCTP_INITIATION: 3363 /* resend the INIT */ 3364 stcb->asoc.dropped_special_cnt++; 3365 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) { 3366 /* 3367 * If we can get it in, in a few attempts we do 3368 * this, otherwise we let the timer fire. 3369 */ 3370 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, 3371 stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_25); 3372 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 3373 } 3374 break; 3375 case SCTP_SELECTIVE_ACK: 3376 case SCTP_NR_SELECTIVE_ACK: 3377 /* resend the sack */ 3378 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED); 3379 break; 3380 case SCTP_HEARTBEAT_REQUEST: 3381 /* resend a demand HB */ 3382 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) { 3383 /* 3384 * Only retransmit if we KNOW we wont destroy the 3385 * tcb 3386 */ 3387 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 3388 } 3389 break; 3390 case SCTP_SHUTDOWN: 3391 sctp_send_shutdown(stcb, net); 3392 break; 3393 case SCTP_SHUTDOWN_ACK: 3394 sctp_send_shutdown_ack(stcb, net); 3395 break; 3396 case SCTP_COOKIE_ECHO: 3397 { 3398 struct sctp_tmit_chunk *cookie; 3399 3400 cookie = NULL; 3401 TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, 3402 sctp_next) { 3403 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) { 3404 break; 3405 } 3406 } 3407 if (cookie) { 3408 if (cookie->sent != SCTP_DATAGRAM_RESEND) 3409 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3410 cookie->sent = SCTP_DATAGRAM_RESEND; 3411 sctp_stop_all_cookie_timers(stcb); 3412 } 3413 } 3414 break; 3415 case SCTP_COOKIE_ACK: 3416 sctp_send_cookie_ack(stcb); 3417 break; 3418 case SCTP_ASCONF_ACK: 3419 /* resend last asconf ack */ 3420 sctp_send_asconf_ack(stcb); 3421 break; 3422 case SCTP_FORWARD_CUM_TSN: 3423 send_forward_tsn(stcb, &stcb->asoc); 3424 break; 3425 /* can't do anything with these */ 3426 case SCTP_PACKET_DROPPED: 3427 case SCTP_INITIATION_ACK: /* this should not happen */ 3428 case SCTP_HEARTBEAT_ACK: 3429 case SCTP_ABORT_ASSOCIATION: 3430 case SCTP_OPERATION_ERROR: 3431 case SCTP_SHUTDOWN_COMPLETE: 3432 case SCTP_ECN_ECHO: 3433 case SCTP_ECN_CWR: 3434 default: 3435 break; 3436 } 3437 return (0); 3438} 3439 3440void 3441sctp_reset_in_stream(struct sctp_tcb *stcb, int number_entries, uint16_t * list) 3442{ 3443 int i; 3444 uint16_t temp; 3445 3446 /* 3447 * We set things to 0xffff since this is the last delivered sequence 3448 * and we will be sending in 0 after the reset. 3449 */ 3450 3451 if (number_entries) { 3452 for (i = 0; i < number_entries; i++) { 3453 temp = ntohs(list[i]); 3454 if (temp >= stcb->asoc.streamincnt) { 3455 continue; 3456 } 3457 stcb->asoc.strmin[temp].last_sequence_delivered = 0xffff; 3458 } 3459 } else { 3460 list = NULL; 3461 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3462 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff; 3463 } 3464 } 3465 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3466} 3467 3468static void 3469sctp_reset_out_streams(struct sctp_tcb *stcb, int number_entries, uint16_t * list) 3470{ 3471 int i; 3472 3473 if (number_entries == 0) { 3474 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3475 stcb->asoc.strmout[i].next_sequence_sent = 0; 3476 } 3477 } else if (number_entries) { 3478 for (i = 0; i < number_entries; i++) { 3479 uint16_t temp; 3480 3481 temp = ntohs(list[i]); 3482 if (temp >= stcb->asoc.streamoutcnt) { 3483 /* no such stream */ 3484 continue; 3485 } 3486 stcb->asoc.strmout[temp].next_sequence_sent = 0; 3487 } 3488 } 3489 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3490} 3491 3492 3493struct sctp_stream_reset_out_request * 3494sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk) 3495{ 3496 struct sctp_association *asoc; 3497 struct sctp_stream_reset_out_req *req; 3498 struct sctp_stream_reset_out_request *r; 3499 struct sctp_tmit_chunk *chk; 3500 int len, clen; 3501 3502 asoc = &stcb->asoc; 3503 if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 3504 asoc->stream_reset_outstanding = 0; 3505 return (NULL); 3506 } 3507 if (stcb->asoc.str_reset == NULL) { 3508 asoc->stream_reset_outstanding = 0; 3509 return (NULL); 3510 } 3511 chk = stcb->asoc.str_reset; 3512 if (chk->data == NULL) { 3513 return (NULL); 3514 } 3515 if (bchk) { 3516 /* he wants a copy of the chk pointer */ 3517 *bchk = chk; 3518 } 3519 clen = chk->send_size; 3520 req = mtod(chk->data, struct sctp_stream_reset_out_req *); 3521 r = &req->sr_req; 3522 if (ntohl(r->request_seq) == seq) { 3523 /* found it */ 3524 return (r); 3525 } 3526 len = SCTP_SIZE32(ntohs(r->ph.param_length)); 3527 if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) { 3528 /* move to the next one, there can only be a max of two */ 3529 r = (struct sctp_stream_reset_out_request *)((caddr_t)r + len); 3530 if (ntohl(r->request_seq) == seq) { 3531 return (r); 3532 } 3533 } 3534 /* that seq is not here */ 3535 return (NULL); 3536} 3537 3538static void 3539sctp_clean_up_stream_reset(struct sctp_tcb *stcb) 3540{ 3541 struct sctp_association *asoc; 3542 struct sctp_tmit_chunk *chk = stcb->asoc.str_reset; 3543 3544 if (stcb->asoc.str_reset == NULL) { 3545 return; 3546 } 3547 asoc = &stcb->asoc; 3548 3549 sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_26); 3550 TAILQ_REMOVE(&asoc->control_send_queue, 3551 chk, 3552 sctp_next); 3553 if (chk->data) { 3554 sctp_m_freem(chk->data); 3555 chk->data = NULL; 3556 } 3557 asoc->ctrl_queue_cnt--; 3558 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3559 /* sa_ignore NO_NULL_CHK */ 3560 stcb->asoc.str_reset = NULL; 3561} 3562 3563 3564static int 3565sctp_handle_stream_reset_response(struct sctp_tcb *stcb, 3566 uint32_t seq, uint32_t action, 3567 struct sctp_stream_reset_response *respin) 3568{ 3569 uint16_t type; 3570 int lparm_len; 3571 struct sctp_association *asoc = &stcb->asoc; 3572 struct sctp_tmit_chunk *chk; 3573 struct sctp_stream_reset_out_request *srparam; 3574 int number_entries; 3575 3576 if (asoc->stream_reset_outstanding == 0) { 3577 /* duplicate */ 3578 return (0); 3579 } 3580 if (seq == stcb->asoc.str_reset_seq_out) { 3581 srparam = sctp_find_stream_reset(stcb, seq, &chk); 3582 if (srparam) { 3583 stcb->asoc.str_reset_seq_out++; 3584 type = ntohs(srparam->ph.param_type); 3585 lparm_len = ntohs(srparam->ph.param_length); 3586 if (type == SCTP_STR_RESET_OUT_REQUEST) { 3587 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t); 3588 asoc->stream_reset_out_is_outstanding = 0; 3589 if (asoc->stream_reset_outstanding) 3590 asoc->stream_reset_outstanding--; 3591 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3592 /* do it */ 3593 sctp_reset_out_streams(stcb, number_entries, srparam->list_of_streams); 3594 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3595 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED); 3596 } else { 3597 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED); 3598 } 3599 } else if (type == SCTP_STR_RESET_IN_REQUEST) { 3600 /* Answered my request */ 3601 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t); 3602 if (asoc->stream_reset_outstanding) 3603 asoc->stream_reset_outstanding--; 3604 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3605 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb, 3606 number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED); 3607 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3608 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb, 3609 number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED); 3610 } 3611 } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) { 3612 /* Ok we now may have more streams */ 3613 int num_stream; 3614 3615 num_stream = stcb->asoc.strm_pending_add_size; 3616 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) { 3617 /* TSNH */ 3618 num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt; 3619 } 3620 stcb->asoc.strm_pending_add_size = 0; 3621 if (asoc->stream_reset_outstanding) 3622 asoc->stream_reset_outstanding--; 3623 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3624 /* Put the new streams into effect */ 3625 stcb->asoc.streamoutcnt += num_stream; 3626 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 3627 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3628 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3629 SCTP_STREAM_CHANGE_DENIED); 3630 } else { 3631 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3632 SCTP_STREAM_CHANGE_FAILED); 3633 } 3634 } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) { 3635 if (asoc->stream_reset_outstanding) 3636 asoc->stream_reset_outstanding--; 3637 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3638 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3639 SCTP_STREAM_CHANGE_DENIED); 3640 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3641 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3642 SCTP_STREAM_CHANGE_FAILED); 3643 } 3644 } else if (type == SCTP_STR_RESET_TSN_REQUEST) { 3645 /** 3646 * a) Adopt the new in tsn. 3647 * b) reset the map 3648 * c) Adopt the new out-tsn 3649 */ 3650 struct sctp_stream_reset_response_tsn *resp; 3651 struct sctp_forward_tsn_chunk fwdtsn; 3652 int abort_flag = 0; 3653 3654 if (respin == NULL) { 3655 /* huh ? */ 3656 return (0); 3657 } 3658 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3659 resp = (struct sctp_stream_reset_response_tsn *)respin; 3660 asoc->stream_reset_outstanding--; 3661 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3662 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3663 fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1); 3664 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3665 if (abort_flag) { 3666 return (1); 3667 } 3668 stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1); 3669 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3670 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3671 } 3672 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 3673 stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn); 3674 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 3675 3676 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map; 3677 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size); 3678 3679 stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn); 3680 stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn; 3681 3682 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL); 3683 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL); 3684 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0); 3685 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3686 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3687 SCTP_ASSOC_RESET_DENIED); 3688 } else { 3689 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3690 SCTP_ASSOC_RESET_FAILED); 3691 } 3692 } 3693 /* get rid of the request and get the request flags */ 3694 if (asoc->stream_reset_outstanding == 0) { 3695 sctp_clean_up_stream_reset(stcb); 3696 } 3697 } 3698 } 3699 return (0); 3700} 3701 3702static void 3703sctp_handle_str_reset_request_in(struct sctp_tcb *stcb, 3704 struct sctp_tmit_chunk *chk, 3705 struct sctp_stream_reset_in_request *req, int trunc) 3706{ 3707 uint32_t seq; 3708 int len, i; 3709 int number_entries; 3710 uint16_t temp; 3711 3712 /* 3713 * peer wants me to send a str-reset to him for my outgoing seq's if 3714 * seq_in is right. 3715 */ 3716 struct sctp_association *asoc = &stcb->asoc; 3717 3718 seq = ntohl(req->request_seq); 3719 if (asoc->str_reset_seq_in == seq) { 3720 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3721 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3722 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3723 } else if (trunc) { 3724 /* Can't do it, since they exceeded our buffer size */ 3725 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3726 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) { 3727 len = ntohs(req->ph.param_length); 3728 number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t)); 3729 for (i = 0; i < number_entries; i++) { 3730 temp = ntohs(req->list_of_streams[i]); 3731 req->list_of_streams[i] = temp; 3732 } 3733 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3734 sctp_add_stream_reset_out(chk, number_entries, req->list_of_streams, 3735 asoc->str_reset_seq_out, 3736 seq, (asoc->sending_seq - 1)); 3737 asoc->stream_reset_out_is_outstanding = 1; 3738 asoc->str_reset = chk; 3739 sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo); 3740 stcb->asoc.stream_reset_outstanding++; 3741 } else { 3742 /* Can't do it, since we have sent one out */ 3743 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 3744 } 3745 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3746 asoc->str_reset_seq_in++; 3747 } else if (asoc->str_reset_seq_in - 1 == seq) { 3748 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3749 } else if (asoc->str_reset_seq_in - 2 == seq) { 3750 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3751 } else { 3752 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3753 } 3754} 3755 3756static int 3757sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb, 3758 struct sctp_tmit_chunk *chk, 3759 struct sctp_stream_reset_tsn_request *req) 3760{ 3761 /* reset all in and out and update the tsn */ 3762 /* 3763 * A) reset my str-seq's on in and out. B) Select a receive next, 3764 * and set cum-ack to it. Also process this selected number as a 3765 * fwd-tsn as well. C) set in the response my next sending seq. 3766 */ 3767 struct sctp_forward_tsn_chunk fwdtsn; 3768 struct sctp_association *asoc = &stcb->asoc; 3769 int abort_flag = 0; 3770 uint32_t seq; 3771 3772 seq = ntohl(req->request_seq); 3773 if (asoc->str_reset_seq_in == seq) { 3774 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3775 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 3776 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3777 } else { 3778 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3779 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3780 fwdtsn.ch.chunk_flags = 0; 3781 fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1); 3782 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3783 if (abort_flag) { 3784 return (1); 3785 } 3786 asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA; 3787 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3788 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3789 } 3790 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map; 3791 asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1; 3792 memset(asoc->mapping_array, 0, asoc->mapping_array_size); 3793 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 3794 memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size); 3795 atomic_add_int(&asoc->sending_seq, 1); 3796 /* save off historical data for retrans */ 3797 asoc->last_sending_seq[1] = asoc->last_sending_seq[0]; 3798 asoc->last_sending_seq[0] = asoc->sending_seq; 3799 asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0]; 3800 asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn; 3801 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL); 3802 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL); 3803 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3804 sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0); 3805 } 3806 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3807 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3808 asoc->str_reset_seq_in++; 3809 } else if (asoc->str_reset_seq_in - 1 == seq) { 3810 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3811 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3812 } else if (asoc->str_reset_seq_in - 2 == seq) { 3813 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1], 3814 asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]); 3815 } else { 3816 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3817 } 3818 return (0); 3819} 3820 3821static void 3822sctp_handle_str_reset_request_out(struct sctp_tcb *stcb, 3823 struct sctp_tmit_chunk *chk, 3824 struct sctp_stream_reset_out_request *req, int trunc) 3825{ 3826 uint32_t seq, tsn; 3827 int number_entries, len; 3828 struct sctp_association *asoc = &stcb->asoc; 3829 3830 seq = ntohl(req->request_seq); 3831 3832 /* now if its not a duplicate we process it */ 3833 if (asoc->str_reset_seq_in == seq) { 3834 len = ntohs(req->ph.param_length); 3835 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t)); 3836 /* 3837 * the sender is resetting, handle the list issue.. we must 3838 * a) verify if we can do the reset, if so no problem b) If 3839 * we can't do the reset we must copy the request. c) queue 3840 * it, and setup the data in processor to trigger it off 3841 * when needed and dequeue all the queued data. 3842 */ 3843 tsn = ntohl(req->send_reset_at_tsn); 3844 3845 /* move the reset action back one */ 3846 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3847 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3848 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3849 } else if (trunc) { 3850 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3851 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) { 3852 /* we can do it now */ 3853 sctp_reset_in_stream(stcb, number_entries, req->list_of_streams); 3854 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3855 } else { 3856 /* 3857 * we must queue it up and thus wait for the TSN's 3858 * to arrive that are at or before tsn 3859 */ 3860 struct sctp_stream_reset_list *liste; 3861 int siz; 3862 3863 siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t)); 3864 SCTP_MALLOC(liste, struct sctp_stream_reset_list *, 3865 siz, SCTP_M_STRESET); 3866 if (liste == NULL) { 3867 /* gak out of memory */ 3868 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3869 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3870 return; 3871 } 3872 liste->tsn = tsn; 3873 liste->number_entries = number_entries; 3874 memcpy(&liste->req, req, 3875 (sizeof(struct sctp_stream_reset_out_request) + (number_entries * sizeof(uint16_t)))); 3876 TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp); 3877 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3878 } 3879 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3880 asoc->str_reset_seq_in++; 3881 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3882 /* 3883 * one seq back, just echo back last action since my 3884 * response was lost. 3885 */ 3886 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3887 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3888 /* 3889 * two seq back, just echo back last action since my 3890 * response was lost. 3891 */ 3892 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3893 } else { 3894 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3895 } 3896} 3897 3898static void 3899sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 3900 struct sctp_stream_reset_add_strm *str_add) 3901{ 3902 /* 3903 * Peer is requesting to add more streams. If its within our 3904 * max-streams we will allow it. 3905 */ 3906 uint32_t num_stream, i; 3907 uint32_t seq; 3908 struct sctp_association *asoc = &stcb->asoc; 3909 struct sctp_queued_to_read *ctl, *nctl; 3910 3911 /* Get the number. */ 3912 seq = ntohl(str_add->request_seq); 3913 num_stream = ntohs(str_add->number_of_streams); 3914 /* Now what would be the new total? */ 3915 if (asoc->str_reset_seq_in == seq) { 3916 num_stream += stcb->asoc.streamincnt; 3917 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3918 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 3919 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3920 } else if ((num_stream > stcb->asoc.max_inbound_streams) || 3921 (num_stream > 0xffff)) { 3922 /* We must reject it they ask for to many */ 3923 denied: 3924 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3925 } else { 3926 /* Ok, we can do that :-) */ 3927 struct sctp_stream_in *oldstrm; 3928 3929 /* save off the old */ 3930 oldstrm = stcb->asoc.strmin; 3931 SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *, 3932 (num_stream * sizeof(struct sctp_stream_in)), 3933 SCTP_M_STRMI); 3934 if (stcb->asoc.strmin == NULL) { 3935 stcb->asoc.strmin = oldstrm; 3936 goto denied; 3937 } 3938 /* copy off the old data */ 3939 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3940 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 3941 stcb->asoc.strmin[i].stream_no = i; 3942 stcb->asoc.strmin[i].last_sequence_delivered = oldstrm[i].last_sequence_delivered; 3943 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started; 3944 /* now anything on those queues? */ 3945 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next, nctl) { 3946 TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next); 3947 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next); 3948 } 3949 } 3950 /* Init the new streams */ 3951 for (i = stcb->asoc.streamincnt; i < num_stream; i++) { 3952 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 3953 stcb->asoc.strmin[i].stream_no = i; 3954 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff; 3955 stcb->asoc.strmin[i].delivery_started = 0; 3956 } 3957 SCTP_FREE(oldstrm, SCTP_M_STRMI); 3958 /* update the size */ 3959 stcb->asoc.streamincnt = num_stream; 3960 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3961 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 3962 } 3963 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3964 asoc->str_reset_seq_in++; 3965 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3966 /* 3967 * one seq back, just echo back last action since my 3968 * response was lost. 3969 */ 3970 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3971 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3972 /* 3973 * two seq back, just echo back last action since my 3974 * response was lost. 3975 */ 3976 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3977 } else { 3978 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3979 3980 } 3981} 3982 3983static void 3984sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 3985 struct sctp_stream_reset_add_strm *str_add) 3986{ 3987 /* 3988 * Peer is requesting to add more streams. If its within our 3989 * max-streams we will allow it. 3990 */ 3991 uint16_t num_stream; 3992 uint32_t seq; 3993 struct sctp_association *asoc = &stcb->asoc; 3994 3995 /* Get the number. */ 3996 seq = ntohl(str_add->request_seq); 3997 num_stream = ntohs(str_add->number_of_streams); 3998 /* Now what would be the new total? */ 3999 if (asoc->str_reset_seq_in == seq) { 4000 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 4001 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 4002 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4003 } else if (stcb->asoc.stream_reset_outstanding) { 4004 /* We must reject it we have something pending */ 4005 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 4006 } else { 4007 /* Ok, we can do that :-) */ 4008 int mychk; 4009 4010 mychk = stcb->asoc.streamoutcnt; 4011 mychk += num_stream; 4012 if (mychk < 0x10000) { 4013 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 4014 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 0, 1, num_stream, 0, 1)) { 4015 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4016 } 4017 } else { 4018 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4019 } 4020 } 4021 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]); 4022 asoc->str_reset_seq_in++; 4023 } else if ((asoc->str_reset_seq_in - 1) == seq) { 4024 /* 4025 * one seq back, just echo back last action since my 4026 * response was lost. 4027 */ 4028 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4029 } else if ((asoc->str_reset_seq_in - 2) == seq) { 4030 /* 4031 * two seq back, just echo back last action since my 4032 * response was lost. 4033 */ 4034 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 4035 } else { 4036 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 4037 } 4038} 4039 4040#ifdef __GNUC__ 4041__attribute__((noinline)) 4042#endif 4043 static int 4044 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset, 4045 struct sctp_stream_reset_out_req *sr_req) 4046{ 4047 int chk_length, param_len, ptype; 4048 struct sctp_paramhdr pstore; 4049 uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE]; 4050 uint32_t seq = 0; 4051 int num_req = 0; 4052 int trunc = 0; 4053 struct sctp_tmit_chunk *chk; 4054 struct sctp_chunkhdr *ch; 4055 struct sctp_paramhdr *ph; 4056 int ret_code = 0; 4057 int num_param = 0; 4058 4059 /* now it may be a reset or a reset-response */ 4060 chk_length = ntohs(sr_req->ch.chunk_length); 4061 4062 /* setup for adding the response */ 4063 sctp_alloc_a_chunk(stcb, chk); 4064 if (chk == NULL) { 4065 return (ret_code); 4066 } 4067 chk->rec.chunk_id.id = SCTP_STREAM_RESET; 4068 chk->rec.chunk_id.can_take_data = 0; 4069 chk->asoc = &stcb->asoc; 4070 chk->no_fr_allowed = 0; 4071 chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr); 4072 chk->book_size_scale = 0; 4073 chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA); 4074 if (chk->data == NULL) { 4075strres_nochunk: 4076 if (chk->data) { 4077 sctp_m_freem(chk->data); 4078 chk->data = NULL; 4079 } 4080 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 4081 return (ret_code); 4082 } 4083 SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD); 4084 4085 /* setup chunk parameters */ 4086 chk->sent = SCTP_DATAGRAM_UNSENT; 4087 chk->snd_count = 0; 4088 chk->whoTo = NULL; 4089 4090 ch = mtod(chk->data, struct sctp_chunkhdr *); 4091 ch->chunk_type = SCTP_STREAM_RESET; 4092 ch->chunk_flags = 0; 4093 ch->chunk_length = htons(chk->send_size); 4094 SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size); 4095 offset += sizeof(struct sctp_chunkhdr); 4096 while ((size_t)chk_length >= sizeof(struct sctp_stream_reset_tsn_request)) { 4097 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *) & pstore); 4098 if (ph == NULL) 4099 break; 4100 param_len = ntohs(ph->param_length); 4101 if (param_len < (int)sizeof(struct sctp_stream_reset_tsn_request)) { 4102 /* bad param */ 4103 break; 4104 } 4105 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, (int)sizeof(cstore)), 4106 (uint8_t *) & cstore); 4107 ptype = ntohs(ph->param_type); 4108 num_param++; 4109 if (param_len > (int)sizeof(cstore)) { 4110 trunc = 1; 4111 } else { 4112 trunc = 0; 4113 } 4114 if (num_param > SCTP_MAX_RESET_PARAMS) { 4115 /* hit the max of parameters already sorry.. */ 4116 break; 4117 } 4118 if (ptype == SCTP_STR_RESET_OUT_REQUEST) { 4119 struct sctp_stream_reset_out_request *req_out; 4120 4121 req_out = (struct sctp_stream_reset_out_request *)ph; 4122 num_req++; 4123 if (stcb->asoc.stream_reset_outstanding) { 4124 seq = ntohl(req_out->response_seq); 4125 if (seq == stcb->asoc.str_reset_seq_out) { 4126 /* implicit ack */ 4127 (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL); 4128 } 4129 } 4130 sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc); 4131 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) { 4132 struct sctp_stream_reset_add_strm *str_add; 4133 4134 str_add = (struct sctp_stream_reset_add_strm *)ph; 4135 num_req++; 4136 sctp_handle_str_reset_add_strm(stcb, chk, str_add); 4137 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) { 4138 struct sctp_stream_reset_add_strm *str_add; 4139 4140 str_add = (struct sctp_stream_reset_add_strm *)ph; 4141 num_req++; 4142 sctp_handle_str_reset_add_out_strm(stcb, chk, str_add); 4143 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) { 4144 struct sctp_stream_reset_in_request *req_in; 4145 4146 num_req++; 4147 req_in = (struct sctp_stream_reset_in_request *)ph; 4148 sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc); 4149 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) { 4150 struct sctp_stream_reset_tsn_request *req_tsn; 4151 4152 num_req++; 4153 req_tsn = (struct sctp_stream_reset_tsn_request *)ph; 4154 if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) { 4155 ret_code = 1; 4156 goto strres_nochunk; 4157 } 4158 /* no more */ 4159 break; 4160 } else if (ptype == SCTP_STR_RESET_RESPONSE) { 4161 struct sctp_stream_reset_response *resp; 4162 uint32_t result; 4163 4164 resp = (struct sctp_stream_reset_response *)ph; 4165 seq = ntohl(resp->response_seq); 4166 result = ntohl(resp->result); 4167 if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) { 4168 ret_code = 1; 4169 goto strres_nochunk; 4170 } 4171 } else { 4172 break; 4173 } 4174 offset += SCTP_SIZE32(param_len); 4175 chk_length -= SCTP_SIZE32(param_len); 4176 } 4177 if (num_req == 0) { 4178 /* we have no response free the stuff */ 4179 goto strres_nochunk; 4180 } 4181 /* ok we have a chunk to link in */ 4182 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, 4183 chk, 4184 sctp_next); 4185 stcb->asoc.ctrl_queue_cnt++; 4186 return (ret_code); 4187} 4188 4189/* 4190 * Handle a router or endpoints report of a packet loss, there are two ways 4191 * to handle this, either we get the whole packet and must disect it 4192 * ourselves (possibly with truncation and or corruption) or it is a summary 4193 * from a middle box that did the disectting for us. 4194 */ 4195static void 4196sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp, 4197 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 4198{ 4199 uint32_t bottle_bw, on_queue; 4200 uint16_t trunc_len; 4201 unsigned int chlen; 4202 unsigned int at; 4203 struct sctp_chunk_desc desc; 4204 struct sctp_chunkhdr *ch; 4205 4206 chlen = ntohs(cp->ch.chunk_length); 4207 chlen -= sizeof(struct sctp_pktdrop_chunk); 4208 /* XXX possible chlen underflow */ 4209 if (chlen == 0) { 4210 ch = NULL; 4211 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) 4212 SCTP_STAT_INCR(sctps_pdrpbwrpt); 4213 } else { 4214 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr)); 4215 chlen -= sizeof(struct sctphdr); 4216 /* XXX possible chlen underflow */ 4217 memset(&desc, 0, sizeof(desc)); 4218 } 4219 trunc_len = (uint16_t) ntohs(cp->trunc_len); 4220 if (trunc_len > limit) { 4221 trunc_len = limit; 4222 } 4223 /* now the chunks themselves */ 4224 while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) { 4225 desc.chunk_type = ch->chunk_type; 4226 /* get amount we need to move */ 4227 at = ntohs(ch->chunk_length); 4228 if (at < sizeof(struct sctp_chunkhdr)) { 4229 /* corrupt chunk, maybe at the end? */ 4230 SCTP_STAT_INCR(sctps_pdrpcrupt); 4231 break; 4232 } 4233 if (trunc_len == 0) { 4234 /* we are supposed to have all of it */ 4235 if (at > chlen) { 4236 /* corrupt skip it */ 4237 SCTP_STAT_INCR(sctps_pdrpcrupt); 4238 break; 4239 } 4240 } else { 4241 /* is there enough of it left ? */ 4242 if (desc.chunk_type == SCTP_DATA) { 4243 if (chlen < (sizeof(struct sctp_data_chunk) + 4244 sizeof(desc.data_bytes))) { 4245 break; 4246 } 4247 } else { 4248 if (chlen < sizeof(struct sctp_chunkhdr)) { 4249 break; 4250 } 4251 } 4252 } 4253 if (desc.chunk_type == SCTP_DATA) { 4254 /* can we get out the tsn? */ 4255 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4256 SCTP_STAT_INCR(sctps_pdrpmbda); 4257 4258 if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) { 4259 /* yep */ 4260 struct sctp_data_chunk *dcp; 4261 uint8_t *ddp; 4262 unsigned int iii; 4263 4264 dcp = (struct sctp_data_chunk *)ch; 4265 ddp = (uint8_t *) (dcp + 1); 4266 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) { 4267 desc.data_bytes[iii] = ddp[iii]; 4268 } 4269 desc.tsn_ifany = dcp->dp.tsn; 4270 } else { 4271 /* nope we are done. */ 4272 SCTP_STAT_INCR(sctps_pdrpnedat); 4273 break; 4274 } 4275 } else { 4276 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4277 SCTP_STAT_INCR(sctps_pdrpmbct); 4278 } 4279 4280 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) { 4281 SCTP_STAT_INCR(sctps_pdrppdbrk); 4282 break; 4283 } 4284 if (SCTP_SIZE32(at) > chlen) { 4285 break; 4286 } 4287 chlen -= SCTP_SIZE32(at); 4288 if (chlen < sizeof(struct sctp_chunkhdr)) { 4289 /* done, none left */ 4290 break; 4291 } 4292 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at)); 4293 } 4294 /* Now update any rwnd --- possibly */ 4295 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) { 4296 /* From a peer, we get a rwnd report */ 4297 uint32_t a_rwnd; 4298 4299 SCTP_STAT_INCR(sctps_pdrpfehos); 4300 4301 bottle_bw = ntohl(cp->bottle_bw); 4302 on_queue = ntohl(cp->current_onq); 4303 if (bottle_bw && on_queue) { 4304 /* a rwnd report is in here */ 4305 if (bottle_bw > on_queue) 4306 a_rwnd = bottle_bw - on_queue; 4307 else 4308 a_rwnd = 0; 4309 4310 if (a_rwnd == 0) 4311 stcb->asoc.peers_rwnd = 0; 4312 else { 4313 if (a_rwnd > stcb->asoc.total_flight) { 4314 stcb->asoc.peers_rwnd = 4315 a_rwnd - stcb->asoc.total_flight; 4316 } else { 4317 stcb->asoc.peers_rwnd = 0; 4318 } 4319 if (stcb->asoc.peers_rwnd < 4320 stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 4321 /* SWS sender side engages */ 4322 stcb->asoc.peers_rwnd = 0; 4323 } 4324 } 4325 } 4326 } else { 4327 SCTP_STAT_INCR(sctps_pdrpfmbox); 4328 } 4329 4330 /* now middle boxes in sat networks get a cwnd bump */ 4331 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) && 4332 (stcb->asoc.sat_t3_loss_recovery == 0) && 4333 (stcb->asoc.sat_network)) { 4334 /* 4335 * This is debateable but for sat networks it makes sense 4336 * Note if a T3 timer has went off, we will prohibit any 4337 * changes to cwnd until we exit the t3 loss recovery. 4338 */ 4339 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb, 4340 net, cp, &bottle_bw, &on_queue); 4341 } 4342} 4343 4344/* 4345 * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to 4346 * still contain IP/SCTP header - stcb: is the tcb found for this packet - 4347 * offset: offset into the mbuf chain to first chunkhdr - length: is the 4348 * length of the complete packet outputs: - length: modified to remaining 4349 * length after control processing - netp: modified to new sctp_nets after 4350 * cookie-echo processing - return NULL to discard the packet (ie. no asoc, 4351 * bad packet,...) otherwise return the tcb for this packet 4352 */ 4353#ifdef __GNUC__ 4354__attribute__((noinline)) 4355#endif 4356 static struct sctp_tcb * 4357 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length, 4358 struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp, 4359 struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen, 4360 uint32_t vrf_id, uint16_t port) 4361{ 4362 struct sctp_association *asoc; 4363 uint32_t vtag_in; 4364 int num_chunks = 0; /* number of control chunks processed */ 4365 uint32_t chk_length; 4366 int ret; 4367 int abort_no_unlock = 0; 4368 int ecne_seen = 0; 4369 4370 /* 4371 * How big should this be, and should it be alloc'd? Lets try the 4372 * d-mtu-ceiling for now (2k) and that should hopefully work ... 4373 * until we get into jumbo grams and such.. 4374 */ 4375 uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE]; 4376 struct sctp_tcb *locked_tcb = stcb; 4377 int got_auth = 0; 4378 uint32_t auth_offset = 0, auth_len = 0; 4379 int auth_skipped = 0; 4380 int asconf_cnt = 0; 4381 4382#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4383 struct socket *so; 4384 4385#endif 4386 4387 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n", 4388 iphlen, *offset, length, stcb); 4389 4390 /* validate chunk header length... */ 4391 if (ntohs(ch->chunk_length) < sizeof(*ch)) { 4392 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n", 4393 ntohs(ch->chunk_length)); 4394 if (locked_tcb) { 4395 SCTP_TCB_UNLOCK(locked_tcb); 4396 } 4397 return (NULL); 4398 } 4399 /* 4400 * validate the verification tag 4401 */ 4402 vtag_in = ntohl(sh->v_tag); 4403 4404 if (locked_tcb) { 4405 SCTP_TCB_LOCK_ASSERT(locked_tcb); 4406 } 4407 if (ch->chunk_type == SCTP_INITIATION) { 4408 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n", 4409 ntohs(ch->chunk_length), vtag_in); 4410 if (vtag_in != 0) { 4411 /* protocol error- silently discard... */ 4412 SCTP_STAT_INCR(sctps_badvtag); 4413 if (locked_tcb) { 4414 SCTP_TCB_UNLOCK(locked_tcb); 4415 } 4416 return (NULL); 4417 } 4418 } else if (ch->chunk_type != SCTP_COOKIE_ECHO) { 4419 /* 4420 * If there is no stcb, skip the AUTH chunk and process 4421 * later after a stcb is found (to validate the lookup was 4422 * valid. 4423 */ 4424 if ((ch->chunk_type == SCTP_AUTHENTICATION) && 4425 (stcb == NULL) && 4426 !SCTP_BASE_SYSCTL(sctp_auth_disable)) { 4427 /* save this chunk for later processing */ 4428 auth_skipped = 1; 4429 auth_offset = *offset; 4430 auth_len = ntohs(ch->chunk_length); 4431 4432 /* (temporarily) move past this chunk */ 4433 *offset += SCTP_SIZE32(auth_len); 4434 if (*offset >= length) { 4435 /* no more data left in the mbuf chain */ 4436 *offset = length; 4437 if (locked_tcb) { 4438 SCTP_TCB_UNLOCK(locked_tcb); 4439 } 4440 return (NULL); 4441 } 4442 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4443 sizeof(struct sctp_chunkhdr), chunk_buf); 4444 } 4445 if (ch == NULL) { 4446 /* Help */ 4447 *offset = length; 4448 if (locked_tcb) { 4449 SCTP_TCB_UNLOCK(locked_tcb); 4450 } 4451 return (NULL); 4452 } 4453 if (ch->chunk_type == SCTP_COOKIE_ECHO) { 4454 goto process_control_chunks; 4455 } 4456 /* 4457 * first check if it's an ASCONF with an unknown src addr we 4458 * need to look inside to find the association 4459 */ 4460 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) { 4461 struct sctp_chunkhdr *asconf_ch = ch; 4462 uint32_t asconf_offset = 0, asconf_len = 0; 4463 4464 /* inp's refcount may be reduced */ 4465 SCTP_INP_INCR_REF(inp); 4466 4467 asconf_offset = *offset; 4468 do { 4469 asconf_len = ntohs(asconf_ch->chunk_length); 4470 if (asconf_len < sizeof(struct sctp_asconf_paramhdr)) 4471 break; 4472 stcb = sctp_findassociation_ep_asconf(m, 4473 *offset, sh, &inp, netp, vrf_id); 4474 if (stcb != NULL) 4475 break; 4476 asconf_offset += SCTP_SIZE32(asconf_len); 4477 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset, 4478 sizeof(struct sctp_chunkhdr), chunk_buf); 4479 } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF); 4480 if (stcb == NULL) { 4481 /* 4482 * reduce inp's refcount if not reduced in 4483 * sctp_findassociation_ep_asconf(). 4484 */ 4485 SCTP_INP_DECR_REF(inp); 4486 } else { 4487 locked_tcb = stcb; 4488 } 4489 4490 /* now go back and verify any auth chunk to be sure */ 4491 if (auth_skipped && (stcb != NULL)) { 4492 struct sctp_auth_chunk *auth; 4493 4494 auth = (struct sctp_auth_chunk *) 4495 sctp_m_getptr(m, auth_offset, 4496 auth_len, chunk_buf); 4497 got_auth = 1; 4498 auth_skipped = 0; 4499 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, 4500 auth_offset)) { 4501 /* auth HMAC failed so dump it */ 4502 *offset = length; 4503 if (locked_tcb) { 4504 SCTP_TCB_UNLOCK(locked_tcb); 4505 } 4506 return (NULL); 4507 } else { 4508 /* remaining chunks are HMAC checked */ 4509 stcb->asoc.authenticated = 1; 4510 } 4511 } 4512 } 4513 if (stcb == NULL) { 4514 /* no association, so it's out of the blue... */ 4515 sctp_handle_ootb(m, iphlen, *offset, sh, inp, NULL, 4516 vrf_id, port); 4517 *offset = length; 4518 if (locked_tcb) { 4519 SCTP_TCB_UNLOCK(locked_tcb); 4520 } 4521 return (NULL); 4522 } 4523 asoc = &stcb->asoc; 4524 /* ABORT and SHUTDOWN can use either v_tag... */ 4525 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) || 4526 (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) || 4527 (ch->chunk_type == SCTP_PACKET_DROPPED)) { 4528 if ((vtag_in == asoc->my_vtag) || 4529 ((ch->chunk_flags & SCTP_HAD_NO_TCB) && 4530 (vtag_in == asoc->peer_vtag))) { 4531 /* this is valid */ 4532 } else { 4533 /* drop this packet... */ 4534 SCTP_STAT_INCR(sctps_badvtag); 4535 if (locked_tcb) { 4536 SCTP_TCB_UNLOCK(locked_tcb); 4537 } 4538 return (NULL); 4539 } 4540 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 4541 if (vtag_in != asoc->my_vtag) { 4542 /* 4543 * this could be a stale SHUTDOWN-ACK or the 4544 * peer never got the SHUTDOWN-COMPLETE and 4545 * is still hung; we have started a new asoc 4546 * but it won't complete until the shutdown 4547 * is completed 4548 */ 4549 if (locked_tcb) { 4550 SCTP_TCB_UNLOCK(locked_tcb); 4551 } 4552 sctp_handle_ootb(m, iphlen, *offset, sh, inp, 4553 NULL, vrf_id, port); 4554 return (NULL); 4555 } 4556 } else { 4557 /* for all other chunks, vtag must match */ 4558 if (vtag_in != asoc->my_vtag) { 4559 /* invalid vtag... */ 4560 SCTPDBG(SCTP_DEBUG_INPUT3, 4561 "invalid vtag: %xh, expect %xh\n", 4562 vtag_in, asoc->my_vtag); 4563 SCTP_STAT_INCR(sctps_badvtag); 4564 if (locked_tcb) { 4565 SCTP_TCB_UNLOCK(locked_tcb); 4566 } 4567 *offset = length; 4568 return (NULL); 4569 } 4570 } 4571 } /* end if !SCTP_COOKIE_ECHO */ 4572 /* 4573 * process all control chunks... 4574 */ 4575 if (((ch->chunk_type == SCTP_SELECTIVE_ACK) || 4576 (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) || 4577 (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) && 4578 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) { 4579 /* implied cookie-ack.. we must have lost the ack */ 4580 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4581 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4582 stcb->asoc.overall_error_count, 4583 0, 4584 SCTP_FROM_SCTP_INPUT, 4585 __LINE__); 4586 } 4587 stcb->asoc.overall_error_count = 0; 4588 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, 4589 *netp); 4590 } 4591process_control_chunks: 4592 while (IS_SCTP_CONTROL(ch)) { 4593 /* validate chunk length */ 4594 chk_length = ntohs(ch->chunk_length); 4595 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n", 4596 ch->chunk_type, chk_length); 4597 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length); 4598 if (chk_length < sizeof(*ch) || 4599 (*offset + (int)chk_length) > length) { 4600 *offset = length; 4601 if (locked_tcb) { 4602 SCTP_TCB_UNLOCK(locked_tcb); 4603 } 4604 return (NULL); 4605 } 4606 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks); 4607 /* 4608 * INIT-ACK only gets the init ack "header" portion only 4609 * because we don't have to process the peer's COOKIE. All 4610 * others get a complete chunk. 4611 */ 4612 if ((ch->chunk_type == SCTP_INITIATION_ACK) || 4613 (ch->chunk_type == SCTP_INITIATION)) { 4614 /* get an init-ack chunk */ 4615 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4616 sizeof(struct sctp_init_ack_chunk), chunk_buf); 4617 if (ch == NULL) { 4618 *offset = length; 4619 if (locked_tcb) { 4620 SCTP_TCB_UNLOCK(locked_tcb); 4621 } 4622 return (NULL); 4623 } 4624 } else { 4625 /* For cookies and all other chunks. */ 4626 if (chk_length > sizeof(chunk_buf)) { 4627 /* 4628 * use just the size of the chunk buffer so 4629 * the front part of our chunks fit in 4630 * contiguous space up to the chunk buffer 4631 * size (508 bytes). For chunks that need to 4632 * get more than that they must use the 4633 * sctp_m_getptr() function or other means 4634 * (e.g. know how to parse mbuf chains). 4635 * Cookies do this already. 4636 */ 4637 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4638 (sizeof(chunk_buf) - 4), 4639 chunk_buf); 4640 if (ch == NULL) { 4641 *offset = length; 4642 if (locked_tcb) { 4643 SCTP_TCB_UNLOCK(locked_tcb); 4644 } 4645 return (NULL); 4646 } 4647 } else { 4648 /* We can fit it all */ 4649 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4650 chk_length, chunk_buf); 4651 if (ch == NULL) { 4652 SCTP_PRINTF("sctp_process_control: Can't get the all data....\n"); 4653 *offset = length; 4654 if (locked_tcb) { 4655 SCTP_TCB_UNLOCK(locked_tcb); 4656 } 4657 return (NULL); 4658 } 4659 } 4660 } 4661 num_chunks++; 4662 /* Save off the last place we got a control from */ 4663 if (stcb != NULL) { 4664 if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) { 4665 /* 4666 * allow last_control to be NULL if 4667 * ASCONF... ASCONF processing will find the 4668 * right net later 4669 */ 4670 if ((netp != NULL) && (*netp != NULL)) 4671 stcb->asoc.last_control_chunk_from = *netp; 4672 } 4673 } 4674#ifdef SCTP_AUDITING_ENABLED 4675 sctp_audit_log(0xB0, ch->chunk_type); 4676#endif 4677 4678 /* check to see if this chunk required auth, but isn't */ 4679 if ((stcb != NULL) && 4680 !SCTP_BASE_SYSCTL(sctp_auth_disable) && 4681 sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) && 4682 !stcb->asoc.authenticated) { 4683 /* "silently" ignore */ 4684 SCTP_STAT_INCR(sctps_recvauthmissing); 4685 goto next_chunk; 4686 } 4687 switch (ch->chunk_type) { 4688 case SCTP_INITIATION: 4689 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n"); 4690 /* The INIT chunk must be the only chunk. */ 4691 if ((num_chunks > 1) || 4692 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4693 sctp_abort_association(inp, stcb, m, 4694 iphlen, sh, NULL, vrf_id, port); 4695 *offset = length; 4696 return (NULL); 4697 } 4698 /* Honor our resource limit. */ 4699 if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) { 4700 struct mbuf *op_err; 4701 4702 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC); 4703 sctp_abort_association(inp, stcb, m, 4704 iphlen, sh, op_err, vrf_id, port); 4705 *offset = length; 4706 return (NULL); 4707 } 4708 sctp_handle_init(m, iphlen, *offset, sh, 4709 (struct sctp_init_chunk *)ch, inp, 4710 stcb, &abort_no_unlock, vrf_id, port); 4711 *offset = length; 4712 if ((!abort_no_unlock) && (locked_tcb)) { 4713 SCTP_TCB_UNLOCK(locked_tcb); 4714 } 4715 return (NULL); 4716 break; 4717 case SCTP_PAD_CHUNK: 4718 break; 4719 case SCTP_INITIATION_ACK: 4720 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT-ACK\n"); 4721 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4722 /* We are not interested anymore */ 4723 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4724 ; 4725 } else { 4726 if (locked_tcb != stcb) { 4727 /* Very unlikely */ 4728 SCTP_TCB_UNLOCK(locked_tcb); 4729 } 4730 *offset = length; 4731 if (stcb) { 4732#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4733 so = SCTP_INP_SO(inp); 4734 atomic_add_int(&stcb->asoc.refcnt, 1); 4735 SCTP_TCB_UNLOCK(stcb); 4736 SCTP_SOCKET_LOCK(so, 1); 4737 SCTP_TCB_LOCK(stcb); 4738 atomic_subtract_int(&stcb->asoc.refcnt, 1); 4739#endif 4740 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 4741#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4742 SCTP_SOCKET_UNLOCK(so, 1); 4743#endif 4744 } 4745 return (NULL); 4746 } 4747 } 4748 /* The INIT-ACK chunk must be the only chunk. */ 4749 if ((num_chunks > 1) || 4750 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4751 *offset = length; 4752 if (locked_tcb) { 4753 SCTP_TCB_UNLOCK(locked_tcb); 4754 } 4755 return (NULL); 4756 } 4757 if ((netp) && (*netp)) { 4758 ret = sctp_handle_init_ack(m, iphlen, *offset, sh, 4759 (struct sctp_init_ack_chunk *)ch, stcb, *netp, &abort_no_unlock, vrf_id); 4760 } else { 4761 ret = -1; 4762 } 4763 *offset = length; 4764 if (abort_no_unlock) { 4765 return (NULL); 4766 } 4767 /* 4768 * Special case, I must call the output routine to 4769 * get the cookie echoed 4770 */ 4771 if ((stcb != NULL) && (ret == 0)) { 4772 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 4773 } 4774 if (locked_tcb) { 4775 SCTP_TCB_UNLOCK(locked_tcb); 4776 } 4777 return (NULL); 4778 break; 4779 case SCTP_SELECTIVE_ACK: 4780 { 4781 struct sctp_sack_chunk *sack; 4782 int abort_now = 0; 4783 uint32_t a_rwnd, cum_ack; 4784 uint16_t num_seg, num_dup; 4785 uint8_t flags; 4786 int offset_seg, offset_dup; 4787 4788 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK\n"); 4789 SCTP_STAT_INCR(sctps_recvsacks); 4790 if (stcb == NULL) { 4791 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing SACK chunk\n"); 4792 break; 4793 } 4794 if (chk_length < sizeof(struct sctp_sack_chunk)) { 4795 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n"); 4796 break; 4797 } 4798 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4799 /*- 4800 * If we have sent a shutdown-ack, we will pay no 4801 * attention to a sack sent in to us since 4802 * we don't care anymore. 4803 */ 4804 break; 4805 } 4806 sack = (struct sctp_sack_chunk *)ch; 4807 flags = ch->chunk_flags; 4808 cum_ack = ntohl(sack->sack.cum_tsn_ack); 4809 num_seg = ntohs(sack->sack.num_gap_ack_blks); 4810 num_dup = ntohs(sack->sack.num_dup_tsns); 4811 a_rwnd = (uint32_t) ntohl(sack->sack.a_rwnd); 4812 if (sizeof(struct sctp_sack_chunk) + 4813 num_seg * sizeof(struct sctp_gap_ack_block) + 4814 num_dup * sizeof(uint32_t) != chk_length) { 4815 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n"); 4816 break; 4817 } 4818 offset_seg = *offset + sizeof(struct sctp_sack_chunk); 4819 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 4820 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n", 4821 cum_ack, num_seg, a_rwnd); 4822 stcb->asoc.seen_a_sack_this_pkt = 1; 4823 if ((stcb->asoc.pr_sctp_cnt == 0) && 4824 (num_seg == 0) && 4825 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 4826 (stcb->asoc.saw_sack_with_frags == 0) && 4827 (stcb->asoc.saw_sack_with_nr_frags == 0) && 4828 (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) 4829 ) { 4830 /* 4831 * We have a SIMPLE sack having no 4832 * prior segments and data on sent 4833 * queue to be acked.. Use the 4834 * faster path sack processing. We 4835 * also allow window update sacks 4836 * with no missing segments to go 4837 * this way too. 4838 */ 4839 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, &abort_now, ecne_seen); 4840 } else { 4841 if (netp && *netp) 4842 sctp_handle_sack(m, offset_seg, offset_dup, stcb, 4843 num_seg, 0, num_dup, &abort_now, flags, 4844 cum_ack, a_rwnd, ecne_seen); 4845 } 4846 if (abort_now) { 4847 /* ABORT signal from sack processing */ 4848 *offset = length; 4849 return (NULL); 4850 } 4851 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 4852 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 4853 (stcb->asoc.stream_queue_cnt == 0)) { 4854 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 4855 } 4856 } 4857 break; 4858 /* 4859 * EY - nr_sack: If the received chunk is an 4860 * nr_sack chunk 4861 */ 4862 case SCTP_NR_SELECTIVE_ACK: 4863 { 4864 struct sctp_nr_sack_chunk *nr_sack; 4865 int abort_now = 0; 4866 uint32_t a_rwnd, cum_ack; 4867 uint16_t num_seg, num_nr_seg, num_dup; 4868 uint8_t flags; 4869 int offset_seg, offset_dup; 4870 4871 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK\n"); 4872 SCTP_STAT_INCR(sctps_recvsacks); 4873 if (stcb == NULL) { 4874 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing NR-SACK chunk\n"); 4875 break; 4876 } 4877 if ((stcb->asoc.sctp_nr_sack_on_off == 0) || 4878 (stcb->asoc.peer_supports_nr_sack == 0)) { 4879 goto unknown_chunk; 4880 } 4881 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) { 4882 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR-SACK chunk, too small\n"); 4883 break; 4884 } 4885 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4886 /*- 4887 * If we have sent a shutdown-ack, we will pay no 4888 * attention to a sack sent in to us since 4889 * we don't care anymore. 4890 */ 4891 break; 4892 } 4893 nr_sack = (struct sctp_nr_sack_chunk *)ch; 4894 flags = ch->chunk_flags; 4895 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack); 4896 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks); 4897 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks); 4898 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns); 4899 a_rwnd = (uint32_t) ntohl(nr_sack->nr_sack.a_rwnd); 4900 if (sizeof(struct sctp_nr_sack_chunk) + 4901 (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) + 4902 num_dup * sizeof(uint32_t) != chk_length) { 4903 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n"); 4904 break; 4905 } 4906 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk); 4907 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 4908 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n", 4909 cum_ack, num_seg, a_rwnd); 4910 stcb->asoc.seen_a_sack_this_pkt = 1; 4911 if ((stcb->asoc.pr_sctp_cnt == 0) && 4912 (num_seg == 0) && (num_nr_seg == 0) && 4913 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 4914 (stcb->asoc.saw_sack_with_frags == 0) && 4915 (stcb->asoc.saw_sack_with_nr_frags == 0) && 4916 (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) { 4917 /* 4918 * We have a SIMPLE sack having no 4919 * prior segments and data on sent 4920 * queue to be acked. Use the faster 4921 * path sack processing. We also 4922 * allow window update sacks with no 4923 * missing segments to go this way 4924 * too. 4925 */ 4926 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, 4927 &abort_now, ecne_seen); 4928 } else { 4929 if (netp && *netp) 4930 sctp_handle_sack(m, offset_seg, offset_dup, stcb, 4931 num_seg, num_nr_seg, num_dup, &abort_now, flags, 4932 cum_ack, a_rwnd, ecne_seen); 4933 } 4934 if (abort_now) { 4935 /* ABORT signal from sack processing */ 4936 *offset = length; 4937 return (NULL); 4938 } 4939 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 4940 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 4941 (stcb->asoc.stream_queue_cnt == 0)) { 4942 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 4943 } 4944 } 4945 break; 4946 4947 case SCTP_HEARTBEAT_REQUEST: 4948 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n"); 4949 if ((stcb) && netp && *netp) { 4950 SCTP_STAT_INCR(sctps_recvheartbeat); 4951 sctp_send_heartbeat_ack(stcb, m, *offset, 4952 chk_length, *netp); 4953 4954 /* He's alive so give him credit */ 4955 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4956 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4957 stcb->asoc.overall_error_count, 4958 0, 4959 SCTP_FROM_SCTP_INPUT, 4960 __LINE__); 4961 } 4962 stcb->asoc.overall_error_count = 0; 4963 } 4964 break; 4965 case SCTP_HEARTBEAT_ACK: 4966 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT-ACK\n"); 4967 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) { 4968 /* Its not ours */ 4969 *offset = length; 4970 if (locked_tcb) { 4971 SCTP_TCB_UNLOCK(locked_tcb); 4972 } 4973 return (NULL); 4974 } 4975 /* He's alive so give him credit */ 4976 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4977 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4978 stcb->asoc.overall_error_count, 4979 0, 4980 SCTP_FROM_SCTP_INPUT, 4981 __LINE__); 4982 } 4983 stcb->asoc.overall_error_count = 0; 4984 SCTP_STAT_INCR(sctps_recvheartbeatack); 4985 if (netp && *netp) 4986 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch, 4987 stcb, *netp); 4988 break; 4989 case SCTP_ABORT_ASSOCIATION: 4990 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n", 4991 stcb); 4992 if ((stcb) && netp && *netp) 4993 sctp_handle_abort((struct sctp_abort_chunk *)ch, 4994 stcb, *netp); 4995 *offset = length; 4996 return (NULL); 4997 break; 4998 case SCTP_SHUTDOWN: 4999 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n", 5000 stcb); 5001 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) { 5002 *offset = length; 5003 if (locked_tcb) { 5004 SCTP_TCB_UNLOCK(locked_tcb); 5005 } 5006 return (NULL); 5007 } 5008 if (netp && *netp) { 5009 int abort_flag = 0; 5010 5011 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch, 5012 stcb, *netp, &abort_flag); 5013 if (abort_flag) { 5014 *offset = length; 5015 return (NULL); 5016 } 5017 } 5018 break; 5019 case SCTP_SHUTDOWN_ACK: 5020 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-ACK, stcb %p\n", stcb); 5021 if ((stcb) && (netp) && (*netp)) 5022 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp); 5023 *offset = length; 5024 return (NULL); 5025 break; 5026 5027 case SCTP_OPERATION_ERROR: 5028 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP-ERR\n"); 5029 if ((stcb) && netp && *netp && sctp_handle_error(ch, stcb, *netp) < 0) { 5030 *offset = length; 5031 return (NULL); 5032 } 5033 break; 5034 case SCTP_COOKIE_ECHO: 5035 SCTPDBG(SCTP_DEBUG_INPUT3, 5036 "SCTP_COOKIE-ECHO, stcb %p\n", stcb); 5037 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 5038 ; 5039 } else { 5040 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5041 /* We are not interested anymore */ 5042 abend: 5043 if (stcb) { 5044 SCTP_TCB_UNLOCK(stcb); 5045 } 5046 *offset = length; 5047 return (NULL); 5048 } 5049 } 5050 /* 5051 * First are we accepting? We do this again here 5052 * since it is possible that a previous endpoint WAS 5053 * listening responded to a INIT-ACK and then 5054 * closed. We opened and bound.. and are now no 5055 * longer listening. 5056 */ 5057 5058 if ((stcb == NULL) && (inp->sctp_socket->so_qlen >= inp->sctp_socket->so_qlimit)) { 5059 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 5060 (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) { 5061 struct mbuf *op_err; 5062 5063 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC); 5064 sctp_abort_association(inp, stcb, m, 5065 iphlen, sh, op_err, vrf_id, port); 5066 } 5067 *offset = length; 5068 return (NULL); 5069 } else { 5070 struct mbuf *ret_buf; 5071 struct sctp_inpcb *linp; 5072 5073 if (stcb) { 5074 linp = NULL; 5075 } else { 5076 linp = inp; 5077 } 5078 5079 if (linp) { 5080 SCTP_ASOC_CREATE_LOCK(linp); 5081 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 5082 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) { 5083 SCTP_ASOC_CREATE_UNLOCK(linp); 5084 goto abend; 5085 } 5086 } 5087 if (netp) { 5088 ret_buf = 5089 sctp_handle_cookie_echo(m, iphlen, 5090 *offset, sh, 5091 (struct sctp_cookie_echo_chunk *)ch, 5092 &inp, &stcb, netp, 5093 auth_skipped, 5094 auth_offset, 5095 auth_len, 5096 &locked_tcb, 5097 vrf_id, 5098 port); 5099 } else { 5100 ret_buf = NULL; 5101 } 5102 if (linp) { 5103 SCTP_ASOC_CREATE_UNLOCK(linp); 5104 } 5105 if (ret_buf == NULL) { 5106 if (locked_tcb) { 5107 SCTP_TCB_UNLOCK(locked_tcb); 5108 } 5109 SCTPDBG(SCTP_DEBUG_INPUT3, 5110 "GAK, null buffer\n"); 5111 *offset = length; 5112 return (NULL); 5113 } 5114 /* if AUTH skipped, see if it verified... */ 5115 if (auth_skipped) { 5116 got_auth = 1; 5117 auth_skipped = 0; 5118 } 5119 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) { 5120 /* 5121 * Restart the timer if we have 5122 * pending data 5123 */ 5124 struct sctp_tmit_chunk *chk; 5125 5126 chk = TAILQ_FIRST(&stcb->asoc.sent_queue); 5127 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 5128 } 5129 } 5130 break; 5131 case SCTP_COOKIE_ACK: 5132 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE-ACK, stcb %p\n", stcb); 5133 if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) { 5134 if (locked_tcb) { 5135 SCTP_TCB_UNLOCK(locked_tcb); 5136 } 5137 return (NULL); 5138 } 5139 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5140 /* We are not interested anymore */ 5141 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 5142 ; 5143 } else if (stcb) { 5144#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5145 so = SCTP_INP_SO(inp); 5146 atomic_add_int(&stcb->asoc.refcnt, 1); 5147 SCTP_TCB_UNLOCK(stcb); 5148 SCTP_SOCKET_LOCK(so, 1); 5149 SCTP_TCB_LOCK(stcb); 5150 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5151#endif 5152 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 5153#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5154 SCTP_SOCKET_UNLOCK(so, 1); 5155#endif 5156 *offset = length; 5157 return (NULL); 5158 } 5159 } 5160 /* He's alive so give him credit */ 5161 if ((stcb) && netp && *netp) { 5162 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5163 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5164 stcb->asoc.overall_error_count, 5165 0, 5166 SCTP_FROM_SCTP_INPUT, 5167 __LINE__); 5168 } 5169 stcb->asoc.overall_error_count = 0; 5170 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp); 5171 } 5172 break; 5173 case SCTP_ECN_ECHO: 5174 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-ECHO\n"); 5175 /* He's alive so give him credit */ 5176 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) { 5177 /* Its not ours */ 5178 if (locked_tcb) { 5179 SCTP_TCB_UNLOCK(locked_tcb); 5180 } 5181 *offset = length; 5182 return (NULL); 5183 } 5184 if (stcb) { 5185 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5186 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5187 stcb->asoc.overall_error_count, 5188 0, 5189 SCTP_FROM_SCTP_INPUT, 5190 __LINE__); 5191 } 5192 stcb->asoc.overall_error_count = 0; 5193 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, 5194 stcb); 5195 ecne_seen = 1; 5196 } 5197 break; 5198 case SCTP_ECN_CWR: 5199 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-CWR\n"); 5200 /* He's alive so give him credit */ 5201 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) { 5202 /* Its not ours */ 5203 if (locked_tcb) { 5204 SCTP_TCB_UNLOCK(locked_tcb); 5205 } 5206 *offset = length; 5207 return (NULL); 5208 } 5209 if (stcb) { 5210 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5211 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5212 stcb->asoc.overall_error_count, 5213 0, 5214 SCTP_FROM_SCTP_INPUT, 5215 __LINE__); 5216 } 5217 stcb->asoc.overall_error_count = 0; 5218 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp); 5219 } 5220 break; 5221 case SCTP_SHUTDOWN_COMPLETE: 5222 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-COMPLETE, stcb %p\n", stcb); 5223 /* must be first and only chunk */ 5224 if ((num_chunks > 1) || 5225 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 5226 *offset = length; 5227 if (locked_tcb) { 5228 SCTP_TCB_UNLOCK(locked_tcb); 5229 } 5230 return (NULL); 5231 } 5232 if ((stcb) && netp && *netp) { 5233 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch, 5234 stcb, *netp); 5235 } 5236 *offset = length; 5237 return (NULL); 5238 break; 5239 case SCTP_ASCONF: 5240 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n"); 5241 /* He's alive so give him credit */ 5242 if (stcb) { 5243 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5244 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5245 stcb->asoc.overall_error_count, 5246 0, 5247 SCTP_FROM_SCTP_INPUT, 5248 __LINE__); 5249 } 5250 stcb->asoc.overall_error_count = 0; 5251 sctp_handle_asconf(m, *offset, 5252 (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0); 5253 asconf_cnt++; 5254 } 5255 break; 5256 case SCTP_ASCONF_ACK: 5257 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF-ACK\n"); 5258 if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) { 5259 /* Its not ours */ 5260 if (locked_tcb) { 5261 SCTP_TCB_UNLOCK(locked_tcb); 5262 } 5263 *offset = length; 5264 return (NULL); 5265 } 5266 if ((stcb) && netp && *netp) { 5267 /* He's alive so give him credit */ 5268 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5269 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5270 stcb->asoc.overall_error_count, 5271 0, 5272 SCTP_FROM_SCTP_INPUT, 5273 __LINE__); 5274 } 5275 stcb->asoc.overall_error_count = 0; 5276 sctp_handle_asconf_ack(m, *offset, 5277 (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock); 5278 if (abort_no_unlock) 5279 return (NULL); 5280 } 5281 break; 5282 case SCTP_FORWARD_CUM_TSN: 5283 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD-TSN\n"); 5284 if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) { 5285 /* Its not ours */ 5286 if (locked_tcb) { 5287 SCTP_TCB_UNLOCK(locked_tcb); 5288 } 5289 *offset = length; 5290 return (NULL); 5291 } 5292 /* He's alive so give him credit */ 5293 if (stcb) { 5294 int abort_flag = 0; 5295 5296 stcb->asoc.overall_error_count = 0; 5297 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5298 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5299 stcb->asoc.overall_error_count, 5300 0, 5301 SCTP_FROM_SCTP_INPUT, 5302 __LINE__); 5303 } 5304 *fwd_tsn_seen = 1; 5305 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5306 /* We are not interested anymore */ 5307#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5308 so = SCTP_INP_SO(inp); 5309 atomic_add_int(&stcb->asoc.refcnt, 1); 5310 SCTP_TCB_UNLOCK(stcb); 5311 SCTP_SOCKET_LOCK(so, 1); 5312 SCTP_TCB_LOCK(stcb); 5313 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5314#endif 5315 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_29); 5316#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5317 SCTP_SOCKET_UNLOCK(so, 1); 5318#endif 5319 *offset = length; 5320 return (NULL); 5321 } 5322 sctp_handle_forward_tsn(stcb, 5323 (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset); 5324 if (abort_flag) { 5325 *offset = length; 5326 return (NULL); 5327 } else { 5328 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5329 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5330 stcb->asoc.overall_error_count, 5331 0, 5332 SCTP_FROM_SCTP_INPUT, 5333 __LINE__); 5334 } 5335 stcb->asoc.overall_error_count = 0; 5336 } 5337 5338 } 5339 break; 5340 case SCTP_STREAM_RESET: 5341 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n"); 5342 if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) { 5343 /* Its not ours */ 5344 if (locked_tcb) { 5345 SCTP_TCB_UNLOCK(locked_tcb); 5346 } 5347 *offset = length; 5348 return (NULL); 5349 } 5350 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5351 /* We are not interested anymore */ 5352#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5353 so = SCTP_INP_SO(inp); 5354 atomic_add_int(&stcb->asoc.refcnt, 1); 5355 SCTP_TCB_UNLOCK(stcb); 5356 SCTP_SOCKET_LOCK(so, 1); 5357 SCTP_TCB_LOCK(stcb); 5358 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5359#endif 5360 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_30); 5361#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5362 SCTP_SOCKET_UNLOCK(so, 1); 5363#endif 5364 *offset = length; 5365 return (NULL); 5366 } 5367 if (stcb->asoc.peer_supports_strreset == 0) { 5368 /* 5369 * hmm, peer should have announced this, but 5370 * we will turn it on since he is sending us 5371 * a stream reset. 5372 */ 5373 stcb->asoc.peer_supports_strreset = 1; 5374 } 5375 if (sctp_handle_stream_reset(stcb, m, *offset, (struct sctp_stream_reset_out_req *)ch)) { 5376 /* stop processing */ 5377 *offset = length; 5378 return (NULL); 5379 } 5380 break; 5381 case SCTP_PACKET_DROPPED: 5382 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n"); 5383 /* re-get it all please */ 5384 if (chk_length < sizeof(struct sctp_pktdrop_chunk)) { 5385 /* Its not ours */ 5386 if (locked_tcb) { 5387 SCTP_TCB_UNLOCK(locked_tcb); 5388 } 5389 *offset = length; 5390 return (NULL); 5391 } 5392 if (ch && (stcb) && netp && (*netp)) { 5393 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch, 5394 stcb, *netp, 5395 min(chk_length, (sizeof(chunk_buf) - 4))); 5396 5397 } 5398 break; 5399 5400 case SCTP_AUTHENTICATION: 5401 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n"); 5402 if (SCTP_BASE_SYSCTL(sctp_auth_disable)) 5403 goto unknown_chunk; 5404 5405 if (stcb == NULL) { 5406 /* save the first AUTH for later processing */ 5407 if (auth_skipped == 0) { 5408 auth_offset = *offset; 5409 auth_len = chk_length; 5410 auth_skipped = 1; 5411 } 5412 /* skip this chunk (temporarily) */ 5413 goto next_chunk; 5414 } 5415 if ((chk_length < (sizeof(struct sctp_auth_chunk))) || 5416 (chk_length > (sizeof(struct sctp_auth_chunk) + 5417 SCTP_AUTH_DIGEST_LEN_MAX))) { 5418 /* Its not ours */ 5419 if (locked_tcb) { 5420 SCTP_TCB_UNLOCK(locked_tcb); 5421 } 5422 *offset = length; 5423 return (NULL); 5424 } 5425 if (got_auth == 1) { 5426 /* skip this chunk... it's already auth'd */ 5427 goto next_chunk; 5428 } 5429 got_auth = 1; 5430 if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch, 5431 m, *offset)) { 5432 /* auth HMAC failed so dump the packet */ 5433 *offset = length; 5434 return (stcb); 5435 } else { 5436 /* remaining chunks are HMAC checked */ 5437 stcb->asoc.authenticated = 1; 5438 } 5439 break; 5440 5441 default: 5442 unknown_chunk: 5443 /* it's an unknown chunk! */ 5444 if ((ch->chunk_type & 0x40) && (stcb != NULL)) { 5445 struct mbuf *mm; 5446 struct sctp_paramhdr *phd; 5447 5448 mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 5449 0, M_DONTWAIT, 1, MT_DATA); 5450 if (mm) { 5451 phd = mtod(mm, struct sctp_paramhdr *); 5452 /* 5453 * We cheat and use param type since 5454 * we did not bother to define a 5455 * error cause struct. They are the 5456 * same basic format with different 5457 * names. 5458 */ 5459 phd->param_type = htons(SCTP_CAUSE_UNRECOG_CHUNK); 5460 phd->param_length = htons(chk_length + sizeof(*phd)); 5461 SCTP_BUF_LEN(mm) = sizeof(*phd); 5462 SCTP_BUF_NEXT(mm) = SCTP_M_COPYM(m, *offset, chk_length, M_DONTWAIT); 5463 if (SCTP_BUF_NEXT(mm)) { 5464 if (sctp_pad_lastmbuf(SCTP_BUF_NEXT(mm), SCTP_SIZE32(chk_length) - chk_length, NULL)) { 5465 sctp_m_freem(mm); 5466 } else { 5467#ifdef SCTP_MBUF_LOGGING 5468 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5469 struct mbuf *mat; 5470 5471 for (mat = SCTP_BUF_NEXT(mm); mat; mat = SCTP_BUF_NEXT(mat)) { 5472 if (SCTP_BUF_IS_EXTENDED(mat)) { 5473 sctp_log_mb(mat, SCTP_MBUF_ICOPY); 5474 } 5475 } 5476 } 5477#endif 5478 sctp_queue_op_err(stcb, mm); 5479 } 5480 } else { 5481 sctp_m_freem(mm); 5482 } 5483 } 5484 } 5485 if ((ch->chunk_type & 0x80) == 0) { 5486 /* discard this packet */ 5487 *offset = length; 5488 return (stcb); 5489 } /* else skip this bad chunk and continue... */ 5490 break; 5491 } /* switch (ch->chunk_type) */ 5492 5493 5494next_chunk: 5495 /* get the next chunk */ 5496 *offset += SCTP_SIZE32(chk_length); 5497 if (*offset >= length) { 5498 /* no more data left in the mbuf chain */ 5499 break; 5500 } 5501 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 5502 sizeof(struct sctp_chunkhdr), chunk_buf); 5503 if (ch == NULL) { 5504 if (locked_tcb) { 5505 SCTP_TCB_UNLOCK(locked_tcb); 5506 } 5507 *offset = length; 5508 return (NULL); 5509 } 5510 } /* while */ 5511 5512 if (asconf_cnt > 0 && stcb != NULL) { 5513 sctp_send_asconf_ack(stcb); 5514 } 5515 return (stcb); 5516} 5517 5518 5519#ifdef INVARIANTS 5520#ifdef __GNUC__ 5521__attribute__((noinline)) 5522#endif 5523 void 5524 sctp_validate_no_locks(struct sctp_inpcb *inp) 5525{ 5526 struct sctp_tcb *lstcb; 5527 5528 LIST_FOREACH(lstcb, &inp->sctp_asoc_list, sctp_tcblist) { 5529 if (mtx_owned(&lstcb->tcb_mtx)) { 5530 panic("Own lock on stcb at return from input"); 5531 } 5532 } 5533 if (mtx_owned(&inp->inp_create_mtx)) { 5534 panic("Own create lock on inp"); 5535 } 5536 if (mtx_owned(&inp->inp_mtx)) { 5537 panic("Own inp lock on inp"); 5538 } 5539} 5540 5541#endif 5542 5543/* 5544 * common input chunk processing (v4 and v6) 5545 */ 5546void 5547sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, 5548 int length, struct sctphdr *sh, struct sctp_chunkhdr *ch, 5549 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets *net, 5550 uint8_t ecn_bits, uint32_t vrf_id, uint16_t port) 5551{ 5552 /* 5553 * Control chunk processing 5554 */ 5555 uint32_t high_tsn; 5556 int fwd_tsn_seen = 0, data_processed = 0; 5557 struct mbuf *m = *mm; 5558 int un_sent; 5559 int cnt_ctrl_ready = 0; 5560 5561 SCTP_STAT_INCR(sctps_recvdatagrams); 5562#ifdef SCTP_AUDITING_ENABLED 5563 sctp_audit_log(0xE0, 1); 5564 sctp_auditing(0, inp, stcb, net); 5565#endif 5566 5567 SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n", 5568 m, iphlen, offset, length, stcb); 5569 if (stcb) { 5570 /* always clear this before beginning a packet */ 5571 stcb->asoc.authenticated = 0; 5572 stcb->asoc.seen_a_sack_this_pkt = 0; 5573 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n", 5574 stcb, stcb->asoc.state); 5575 5576 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) || 5577 (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) { 5578 /*- 5579 * If we hit here, we had a ref count 5580 * up when the assoc was aborted and the 5581 * timer is clearing out the assoc, we should 5582 * NOT respond to any packet.. its OOTB. 5583 */ 5584 SCTP_TCB_UNLOCK(stcb); 5585 sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL, 5586 vrf_id, port); 5587 goto out_now; 5588 } 5589 } 5590 if (IS_SCTP_CONTROL(ch)) { 5591 /* process the control portion of the SCTP packet */ 5592 /* sa_ignore NO_NULL_CHK */ 5593 stcb = sctp_process_control(m, iphlen, &offset, length, sh, ch, 5594 inp, stcb, &net, &fwd_tsn_seen, vrf_id, port); 5595 if (stcb) { 5596 /* 5597 * This covers us if the cookie-echo was there and 5598 * it changes our INP. 5599 */ 5600 inp = stcb->sctp_ep; 5601 if ((net) && (port)) { 5602 if (net->port == 0) { 5603 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr)); 5604 } 5605 net->port = port; 5606 } 5607 } 5608 } else { 5609 /* 5610 * no control chunks, so pre-process DATA chunks (these 5611 * checks are taken care of by control processing) 5612 */ 5613 5614 /* 5615 * if DATA only packet, and auth is required, then punt... 5616 * can't have authenticated without any AUTH (control) 5617 * chunks 5618 */ 5619 if ((stcb != NULL) && 5620 !SCTP_BASE_SYSCTL(sctp_auth_disable) && 5621 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) { 5622 /* "silently" ignore */ 5623 SCTP_STAT_INCR(sctps_recvauthmissing); 5624 SCTP_TCB_UNLOCK(stcb); 5625 goto out_now; 5626 } 5627 if (stcb == NULL) { 5628 /* out of the blue DATA chunk */ 5629 sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL, 5630 vrf_id, port); 5631 goto out_now; 5632 } 5633 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) { 5634 /* v_tag mismatch! */ 5635 SCTP_STAT_INCR(sctps_badvtag); 5636 SCTP_TCB_UNLOCK(stcb); 5637 goto out_now; 5638 } 5639 } 5640 5641 if (stcb == NULL) { 5642 /* 5643 * no valid TCB for this packet, or we found it's a bad 5644 * packet while processing control, or we're done with this 5645 * packet (done or skip rest of data), so we drop it... 5646 */ 5647 goto out_now; 5648 } 5649 /* 5650 * DATA chunk processing 5651 */ 5652 /* plow through the data chunks while length > offset */ 5653 5654 /* 5655 * Rest should be DATA only. Check authentication state if AUTH for 5656 * DATA is required. 5657 */ 5658 if ((length > offset) && 5659 (stcb != NULL) && 5660 !SCTP_BASE_SYSCTL(sctp_auth_disable) && 5661 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) && 5662 !stcb->asoc.authenticated) { 5663 /* "silently" ignore */ 5664 SCTP_STAT_INCR(sctps_recvauthmissing); 5665 SCTPDBG(SCTP_DEBUG_AUTH1, 5666 "Data chunk requires AUTH, skipped\n"); 5667 goto trigger_send; 5668 } 5669 if (length > offset) { 5670 int retval; 5671 5672 /* 5673 * First check to make sure our state is correct. We would 5674 * not get here unless we really did have a tag, so we don't 5675 * abort if this happens, just dump the chunk silently. 5676 */ 5677 switch (SCTP_GET_STATE(&stcb->asoc)) { 5678 case SCTP_STATE_COOKIE_ECHOED: 5679 /* 5680 * we consider data with valid tags in this state 5681 * shows us the cookie-ack was lost. Imply it was 5682 * there. 5683 */ 5684 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5685 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5686 stcb->asoc.overall_error_count, 5687 0, 5688 SCTP_FROM_SCTP_INPUT, 5689 __LINE__); 5690 } 5691 stcb->asoc.overall_error_count = 0; 5692 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net); 5693 break; 5694 case SCTP_STATE_COOKIE_WAIT: 5695 /* 5696 * We consider OOTB any data sent during asoc setup. 5697 */ 5698 sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL, 5699 vrf_id, port); 5700 SCTP_TCB_UNLOCK(stcb); 5701 goto out_now; 5702 /* sa_ignore NOTREACHED */ 5703 break; 5704 case SCTP_STATE_EMPTY: /* should not happen */ 5705 case SCTP_STATE_INUSE: /* should not happen */ 5706 case SCTP_STATE_SHUTDOWN_RECEIVED: /* This is a peer error */ 5707 case SCTP_STATE_SHUTDOWN_ACK_SENT: 5708 default: 5709 SCTP_TCB_UNLOCK(stcb); 5710 goto out_now; 5711 /* sa_ignore NOTREACHED */ 5712 break; 5713 case SCTP_STATE_OPEN: 5714 case SCTP_STATE_SHUTDOWN_SENT: 5715 break; 5716 } 5717 /* plow through the data chunks while length > offset */ 5718 retval = sctp_process_data(mm, iphlen, &offset, length, sh, 5719 inp, stcb, net, &high_tsn); 5720 if (retval == 2) { 5721 /* 5722 * The association aborted, NO UNLOCK needed since 5723 * the association is destroyed. 5724 */ 5725 goto out_now; 5726 } 5727 data_processed = 1; 5728 /* 5729 * Anything important needs to have been m_copy'ed in 5730 * process_data 5731 */ 5732 } 5733 /* take care of ecn */ 5734 if ((data_processed == 1) && 5735 (stcb->asoc.ecn_allowed == 1) && 5736 ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) { 5737 /* Yep, we need to add a ECNE */ 5738 sctp_send_ecn_echo(stcb, net, high_tsn); 5739 } 5740 if ((data_processed == 0) && (fwd_tsn_seen)) { 5741 int was_a_gap; 5742 uint32_t highest_tsn; 5743 5744 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) { 5745 highest_tsn = stcb->asoc.highest_tsn_inside_nr_map; 5746 } else { 5747 highest_tsn = stcb->asoc.highest_tsn_inside_map; 5748 } 5749 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn); 5750 stcb->asoc.send_sack = 1; 5751 sctp_sack_check(stcb, was_a_gap); 5752 } else if (fwd_tsn_seen) { 5753 stcb->asoc.send_sack = 1; 5754 } 5755 /* trigger send of any chunks in queue... */ 5756trigger_send: 5757#ifdef SCTP_AUDITING_ENABLED 5758 sctp_audit_log(0xE0, 2); 5759 sctp_auditing(1, inp, stcb, net); 5760#endif 5761 SCTPDBG(SCTP_DEBUG_INPUT1, 5762 "Check for chunk output prw:%d tqe:%d tf=%d\n", 5763 stcb->asoc.peers_rwnd, 5764 TAILQ_EMPTY(&stcb->asoc.control_send_queue), 5765 stcb->asoc.total_flight); 5766 un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight); 5767 if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 5768 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq; 5769 } 5770 if (cnt_ctrl_ready || 5771 ((un_sent) && 5772 (stcb->asoc.peers_rwnd > 0 || 5773 (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) { 5774 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n"); 5775 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 5776 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n"); 5777 } 5778#ifdef SCTP_AUDITING_ENABLED 5779 sctp_audit_log(0xE0, 3); 5780 sctp_auditing(2, inp, stcb, net); 5781#endif 5782 SCTP_TCB_UNLOCK(stcb); 5783out_now: 5784#ifdef INVARIANTS 5785 sctp_validate_no_locks(inp); 5786#endif 5787 return; 5788} 5789 5790#if 0 5791static void 5792sctp_print_mbuf_chain(struct mbuf *m) 5793{ 5794 for (; m; m = SCTP_BUF_NEXT(m)) { 5795 SCTP_PRINTF("%p: m_len = %ld\n", m, SCTP_BUF_LEN(m)); 5796 if (SCTP_BUF_IS_EXTENDED(m)) 5797 SCTP_PRINTF("%p: extend_size = %d\n", m, SCTP_BUF_EXTEND_SIZE(m)); 5798 } 5799} 5800 5801#endif 5802 5803#ifdef INET 5804void 5805sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port) 5806{ 5807 struct mbuf *m; 5808 int iphlen; 5809 uint32_t vrf_id = 0; 5810 uint8_t ecn_bits; 5811 struct ip *ip; 5812 struct sctphdr *sh; 5813 struct sctp_inpcb *inp = NULL; 5814 struct sctp_nets *net; 5815 struct sctp_tcb *stcb = NULL; 5816 struct sctp_chunkhdr *ch; 5817 int refcount_up = 0; 5818 int length, mlen, offset; 5819 5820#if !defined(SCTP_WITH_NO_CSUM) 5821 uint32_t check, calc_check; 5822 5823#endif 5824 5825 if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) { 5826 SCTP_RELEASE_PKT(i_pak); 5827 return; 5828 } 5829 mlen = SCTP_HEADER_LEN(i_pak); 5830 iphlen = off; 5831 m = SCTP_HEADER_TO_CHAIN(i_pak); 5832 5833 net = NULL; 5834 SCTP_STAT_INCR(sctps_recvpackets); 5835 SCTP_STAT_INCR_COUNTER64(sctps_inpackets); 5836 5837 5838#ifdef SCTP_MBUF_LOGGING 5839 /* Log in any input mbufs */ 5840 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5841 struct mbuf *mat; 5842 5843 for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) { 5844 if (SCTP_BUF_IS_EXTENDED(mat)) { 5845 sctp_log_mb(mat, SCTP_MBUF_INPUT); 5846 } 5847 } 5848 } 5849#endif 5850#ifdef SCTP_PACKET_LOGGING 5851 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) 5852 sctp_packet_log(m, mlen); 5853#endif 5854 /* 5855 * Must take out the iphlen, since mlen expects this (only effect lb 5856 * case) 5857 */ 5858 mlen -= iphlen; 5859 5860 /* 5861 * Get IP, SCTP, and first chunk header together in first mbuf. 5862 */ 5863 ip = mtod(m, struct ip *); 5864 offset = iphlen + sizeof(*sh) + sizeof(*ch); 5865 if (SCTP_BUF_LEN(m) < offset) { 5866 if ((m = m_pullup(m, offset)) == 0) { 5867 SCTP_STAT_INCR(sctps_hdrops); 5868 return; 5869 } 5870 ip = mtod(m, struct ip *); 5871 } 5872 /* validate mbuf chain length with IP payload length */ 5873 if (mlen < (SCTP_GET_IPV4_LENGTH(ip) - iphlen)) { 5874 SCTP_STAT_INCR(sctps_hdrops); 5875 goto bad; 5876 } 5877 sh = (struct sctphdr *)((caddr_t)ip + iphlen); 5878 ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(*sh)); 5879 SCTPDBG(SCTP_DEBUG_INPUT1, 5880 "sctp_input() length:%d iphlen:%d\n", mlen, iphlen); 5881 5882 /* SCTP does not allow broadcasts or multicasts */ 5883 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) { 5884 goto bad; 5885 } 5886 if (SCTP_IS_IT_BROADCAST(ip->ip_dst, m)) { 5887 /* 5888 * We only look at broadcast if its a front state, All 5889 * others we will not have a tcb for anyway. 5890 */ 5891 goto bad; 5892 } 5893 /* validate SCTP checksum */ 5894 SCTPDBG(SCTP_DEBUG_CRCOFFLOAD, 5895 "sctp_input(): Packet of length %d received on %s with csum_flags 0x%x.\n", 5896 m->m_pkthdr.len, 5897 if_name(m->m_pkthdr.rcvif), 5898 m->m_pkthdr.csum_flags); 5899#if defined(SCTP_WITH_NO_CSUM) 5900 SCTP_STAT_INCR(sctps_recvnocrc); 5901#else 5902 if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) { 5903 SCTP_STAT_INCR(sctps_recvhwcrc); 5904 goto sctp_skip_csum_4; 5905 } 5906 check = sh->checksum; /* save incoming checksum */ 5907 sh->checksum = 0; /* prepare for calc */ 5908 calc_check = sctp_calculate_cksum(m, iphlen); 5909 sh->checksum = check; 5910 SCTP_STAT_INCR(sctps_recvswcrc); 5911 if (calc_check != check) { 5912 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x m:%p mlen:%d iphlen:%d\n", 5913 calc_check, check, m, mlen, iphlen); 5914 5915 stcb = sctp_findassociation_addr(m, 5916 offset - sizeof(*ch), 5917 sh, ch, &inp, &net, 5918 vrf_id); 5919 if ((net) && (port)) { 5920 if (net->port == 0) { 5921 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr)); 5922 } 5923 net->port = port; 5924 } 5925 if ((net != NULL) && (m->m_flags & M_FLOWID)) { 5926 net->flowid = m->m_pkthdr.flowid; 5927#ifdef INVARIANTS 5928 net->flowidset = 1; 5929#endif 5930 } 5931 if ((inp) && (stcb)) { 5932 sctp_send_packet_dropped(stcb, net, m, iphlen, 1); 5933 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED); 5934 } else if ((inp != NULL) && (stcb == NULL)) { 5935 refcount_up = 1; 5936 } 5937 SCTP_STAT_INCR(sctps_badsum); 5938 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors); 5939 goto bad; 5940 } 5941sctp_skip_csum_4: 5942#endif 5943 /* destination port of 0 is illegal, based on RFC2960. */ 5944 if (sh->dest_port == 0) { 5945 SCTP_STAT_INCR(sctps_hdrops); 5946 goto bad; 5947 } 5948 /* 5949 * Locate pcb and tcb for datagram sctp_findassociation_addr() wants 5950 * IP/SCTP/first chunk header... 5951 */ 5952 stcb = sctp_findassociation_addr(m, offset - sizeof(*ch), 5953 sh, ch, &inp, &net, vrf_id); 5954 if ((net) && (port)) { 5955 if (net->port == 0) { 5956 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr)); 5957 } 5958 net->port = port; 5959 } 5960 if ((net != NULL) && (m->m_flags & M_FLOWID)) { 5961 net->flowid = m->m_pkthdr.flowid; 5962#ifdef INVARIANTS 5963 net->flowidset = 1; 5964#endif 5965 } 5966 /* inp's ref-count increased && stcb locked */ 5967 if (inp == NULL) { 5968 struct sctp_init_chunk *init_chk, chunk_buf; 5969 5970 SCTP_STAT_INCR(sctps_noport); 5971#ifdef ICMP_BANDLIM 5972 /* 5973 * we use the bandwidth limiting to protect against sending 5974 * too many ABORTS all at once. In this case these count the 5975 * same as an ICMP message. 5976 */ 5977 if (badport_bandlim(0) < 0) 5978 goto bad; 5979#endif /* ICMP_BANDLIM */ 5980 SCTPDBG(SCTP_DEBUG_INPUT1, 5981 "Sending a ABORT from packet entry!\n"); 5982 if (ch->chunk_type == SCTP_INITIATION) { 5983 /* 5984 * we do a trick here to get the INIT tag, dig in 5985 * and get the tag from the INIT and put it in the 5986 * common header. 5987 */ 5988 init_chk = (struct sctp_init_chunk *)sctp_m_getptr(m, 5989 iphlen + sizeof(*sh), sizeof(*init_chk), 5990 (uint8_t *) & chunk_buf); 5991 if (init_chk != NULL) 5992 sh->v_tag = init_chk->init.initiate_tag; 5993 } 5994 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 5995 sctp_send_shutdown_complete2(m, sh, vrf_id, port); 5996 goto bad; 5997 } 5998 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) { 5999 goto bad; 6000 } 6001 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) { 6002 if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) || 6003 ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) && 6004 (ch->chunk_type != SCTP_INIT))) { 6005 sctp_send_abort(m, iphlen, sh, 0, NULL, vrf_id, port); 6006 } 6007 } 6008 goto bad; 6009 } else if (stcb == NULL) { 6010 refcount_up = 1; 6011 } 6012#ifdef IPSEC 6013 /* 6014 * I very much doubt any of the IPSEC stuff will work but I have no 6015 * idea, so I will leave it in place. 6016 */ 6017 if (inp && ipsec4_in_reject(m, &inp->ip_inp.inp)) { 6018 MODULE_GLOBAL(ipsec4stat).in_polvio++; 6019 SCTP_STAT_INCR(sctps_hdrops); 6020 goto bad; 6021 } 6022#endif /* IPSEC */ 6023 6024 /* 6025 * common chunk processing 6026 */ 6027 length = ip->ip_len + iphlen; 6028 offset -= sizeof(struct sctp_chunkhdr); 6029 6030 ecn_bits = ip->ip_tos; 6031 6032 /* sa_ignore NO_NULL_CHK */ 6033 sctp_common_input_processing(&m, iphlen, offset, length, sh, ch, 6034 inp, stcb, net, ecn_bits, vrf_id, port); 6035 /* inp's ref-count reduced && stcb unlocked */ 6036 if (m) { 6037 sctp_m_freem(m); 6038 } 6039 if ((inp) && (refcount_up)) { 6040 /* reduce ref-count */ 6041 SCTP_INP_DECR_REF(inp); 6042 } 6043 return; 6044bad: 6045 if (stcb) { 6046 SCTP_TCB_UNLOCK(stcb); 6047 } 6048 if ((inp) && (refcount_up)) { 6049 /* reduce ref-count */ 6050 SCTP_INP_DECR_REF(inp); 6051 } 6052 if (m) { 6053 sctp_m_freem(m); 6054 } 6055 return; 6056} 6057 6058#if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP) 6059extern int *sctp_cpuarry; 6060 6061#endif 6062 6063void 6064sctp_input(struct mbuf *m, int off) 6065{ 6066#if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP) 6067 struct ip *ip; 6068 struct sctphdr *sh; 6069 int offset; 6070 int cpu_to_use; 6071 uint32_t flowid, tag; 6072 6073 if (mp_ncpus > 1) { 6074 if (m->m_flags & M_FLOWID) { 6075 flowid = m->m_pkthdr.flowid; 6076 } else { 6077 /* 6078 * No flow id built by lower layers fix it so we 6079 * create one. 6080 */ 6081 ip = mtod(m, struct ip *); 6082 offset = off + sizeof(*sh); 6083 if (SCTP_BUF_LEN(m) < offset) { 6084 if ((m = m_pullup(m, offset)) == 0) { 6085 SCTP_STAT_INCR(sctps_hdrops); 6086 return; 6087 } 6088 ip = mtod(m, struct ip *); 6089 } 6090 sh = (struct sctphdr *)((caddr_t)ip + off); 6091 tag = htonl(sh->v_tag); 6092 flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port); 6093 m->m_pkthdr.flowid = flowid; 6094 m->m_flags |= M_FLOWID; 6095 } 6096 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus]; 6097 sctp_queue_to_mcore(m, off, cpu_to_use); 6098 return; 6099 } 6100#endif 6101 sctp_input_with_port(m, off, 0); 6102} 6103 6104#endif 6105