sctp_input.c revision 237715
1/*- 2 * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved. 3 * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved. 4 * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions are met: 8 * 9 * a) Redistributions of source code must retain the above copyright notice, 10 * this list of conditions and the following disclaimer. 11 * 12 * b) Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in 14 * the documentation and/or other materials provided with the distribution. 15 * 16 * c) Neither the name of Cisco Systems, Inc. nor the names of its 17 * contributors may be used to endorse or promote products derived 18 * from this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 22 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 24 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 30 * THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33#include <sys/cdefs.h> 34__FBSDID("$FreeBSD: head/sys/netinet/sctp_input.c 237715 2012-06-28 16:01:08Z tuexen $"); 35 36#include <netinet/sctp_os.h> 37#include <netinet/sctp_var.h> 38#include <netinet/sctp_sysctl.h> 39#include <netinet/sctp_pcb.h> 40#include <netinet/sctp_header.h> 41#include <netinet/sctputil.h> 42#include <netinet/sctp_output.h> 43#include <netinet/sctp_input.h> 44#include <netinet/sctp_auth.h> 45#include <netinet/sctp_indata.h> 46#include <netinet/sctp_asconf.h> 47#include <netinet/sctp_bsd_addr.h> 48#include <netinet/sctp_timer.h> 49#include <netinet/sctp_crc32.h> 50#include <netinet/udp.h> 51#include <sys/smp.h> 52 53 54 55static void 56sctp_stop_all_cookie_timers(struct sctp_tcb *stcb) 57{ 58 struct sctp_nets *net; 59 60 /* 61 * This now not only stops all cookie timers it also stops any INIT 62 * timers as well. This will make sure that the timers are stopped 63 * in all collision cases. 64 */ 65 SCTP_TCB_LOCK_ASSERT(stcb); 66 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 67 if (net->rxt_timer.type == SCTP_TIMER_TYPE_COOKIE) { 68 sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE, 69 stcb->sctp_ep, 70 stcb, 71 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_1); 72 } else if (net->rxt_timer.type == SCTP_TIMER_TYPE_INIT) { 73 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, 74 stcb->sctp_ep, 75 stcb, 76 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_2); 77 } 78 } 79} 80 81/* INIT handler */ 82static void 83sctp_handle_init(struct mbuf *m, int iphlen, int offset, 84 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 85 struct sctp_init_chunk *cp, struct sctp_inpcb *inp, 86 struct sctp_tcb *stcb, int *abort_no_unlock, 87 uint8_t use_mflowid, uint32_t mflowid, 88 uint32_t vrf_id, uint16_t port) 89{ 90 struct sctp_init *init; 91 struct mbuf *op_err; 92 93 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_init: handling INIT tcb:%p\n", 94 stcb); 95 if (stcb == NULL) { 96 SCTP_INP_RLOCK(inp); 97 } 98 /* validate length */ 99 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_chunk)) { 100 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 101 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 102 use_mflowid, mflowid, 103 vrf_id, port); 104 if (stcb) 105 *abort_no_unlock = 1; 106 goto outnow; 107 } 108 /* validate parameters */ 109 init = &cp->init; 110 if (init->initiate_tag == 0) { 111 /* protocol error... send abort */ 112 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 113 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 114 use_mflowid, mflowid, 115 vrf_id, port); 116 if (stcb) 117 *abort_no_unlock = 1; 118 goto outnow; 119 } 120 if (ntohl(init->a_rwnd) < SCTP_MIN_RWND) { 121 /* invalid parameter... send abort */ 122 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 123 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 124 use_mflowid, mflowid, 125 vrf_id, port); 126 if (stcb) 127 *abort_no_unlock = 1; 128 goto outnow; 129 } 130 if (init->num_inbound_streams == 0) { 131 /* protocol error... send abort */ 132 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 133 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 134 use_mflowid, mflowid, 135 vrf_id, port); 136 if (stcb) 137 *abort_no_unlock = 1; 138 goto outnow; 139 } 140 if (init->num_outbound_streams == 0) { 141 /* protocol error... send abort */ 142 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 143 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 144 use_mflowid, mflowid, 145 vrf_id, port); 146 if (stcb) 147 *abort_no_unlock = 1; 148 goto outnow; 149 } 150 if (sctp_validate_init_auth_params(m, offset + sizeof(*cp), 151 offset + ntohs(cp->ch.chunk_length))) { 152 /* auth parameter(s) error... send abort */ 153 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, NULL, 154 use_mflowid, mflowid, 155 vrf_id, port); 156 if (stcb) 157 *abort_no_unlock = 1; 158 goto outnow; 159 } 160 /* 161 * We are only accepting if we have a socket with positive 162 * so_qlimit. 163 */ 164 if ((stcb == NULL) && 165 ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 166 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) || 167 (inp->sctp_socket == NULL) || 168 (inp->sctp_socket->so_qlimit == 0))) { 169 /* 170 * FIX ME ?? What about TCP model and we have a 171 * match/restart case? Actually no fix is needed. the lookup 172 * will always find the existing assoc so stcb would not be 173 * NULL. It may be questionable to do this since we COULD 174 * just send back the INIT-ACK and hope that the app did 175 * accept()'s by the time the COOKIE was sent. But there is 176 * a price to pay for COOKIE generation and I don't want to 177 * pay it on the chance that the app will actually do some 178 * accepts(). The App just looses and should NOT be in this 179 * state :-) 180 */ 181 if (SCTP_BASE_SYSCTL(sctp_blackhole) == 0) { 182 sctp_send_abort(m, iphlen, src, dst, sh, 0, NULL, 183 use_mflowid, mflowid, 184 vrf_id, port); 185 } 186 goto outnow; 187 } 188 if ((stcb != NULL) && 189 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT)) { 190 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending SHUTDOWN-ACK\n"); 191 sctp_send_shutdown_ack(stcb, NULL); 192 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 193 } else { 194 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n"); 195 sctp_send_initiate_ack(inp, stcb, m, iphlen, offset, src, dst, 196 sh, cp, 197 use_mflowid, mflowid, 198 vrf_id, port, 199 ((stcb == NULL) ? SCTP_HOLDS_LOCK : SCTP_NOT_LOCKED)); 200 } 201outnow: 202 if (stcb == NULL) { 203 SCTP_INP_RUNLOCK(inp); 204 } 205} 206 207/* 208 * process peer "INIT/INIT-ACK" chunk returns value < 0 on error 209 */ 210 211int 212sctp_is_there_unsent_data(struct sctp_tcb *stcb, int so_locked 213#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING) 214 SCTP_UNUSED 215#endif 216) 217{ 218 int unsent_data = 0; 219 unsigned int i; 220 struct sctp_stream_queue_pending *sp; 221 struct sctp_association *asoc; 222 223 /* 224 * This function returns the number of streams that have true unsent 225 * data on them. Note that as it looks through it will clean up any 226 * places that have old data that has been sent but left at top of 227 * stream queue. 228 */ 229 asoc = &stcb->asoc; 230 SCTP_TCB_SEND_LOCK(stcb); 231 if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 232 /* Check to see if some data queued */ 233 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 234 /* sa_ignore FREED_MEMORY */ 235 sp = TAILQ_FIRST(&stcb->asoc.strmout[i].outqueue); 236 if (sp == NULL) { 237 continue; 238 } 239 if ((sp->msg_is_complete) && 240 (sp->length == 0) && 241 (sp->sender_all_done)) { 242 /* 243 * We are doing differed cleanup. Last time 244 * through when we took all the data the 245 * sender_all_done was not set. 246 */ 247 if (sp->put_last_out == 0) { 248 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n"); 249 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n", 250 sp->sender_all_done, 251 sp->length, 252 sp->msg_is_complete, 253 sp->put_last_out); 254 } 255 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1); 256 TAILQ_REMOVE(&stcb->asoc.strmout[i].outqueue, sp, next); 257 if (sp->net) { 258 sctp_free_remote_addr(sp->net); 259 sp->net = NULL; 260 } 261 if (sp->data) { 262 sctp_m_freem(sp->data); 263 sp->data = NULL; 264 } 265 sctp_free_a_strmoq(stcb, sp, so_locked); 266 } else { 267 unsent_data++; 268 break; 269 } 270 } 271 } 272 SCTP_TCB_SEND_UNLOCK(stcb); 273 return (unsent_data); 274} 275 276static int 277sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb) 278{ 279 struct sctp_init *init; 280 struct sctp_association *asoc; 281 struct sctp_nets *lnet; 282 unsigned int i; 283 284 init = &cp->init; 285 asoc = &stcb->asoc; 286 /* save off parameters */ 287 asoc->peer_vtag = ntohl(init->initiate_tag); 288 asoc->peers_rwnd = ntohl(init->a_rwnd); 289 /* init tsn's */ 290 asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1; 291 292 if (!TAILQ_EMPTY(&asoc->nets)) { 293 /* update any ssthresh's that may have a default */ 294 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) { 295 lnet->ssthresh = asoc->peers_rwnd; 296 if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) { 297 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION); 298 } 299 } 300 } 301 SCTP_TCB_SEND_LOCK(stcb); 302 if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) { 303 unsigned int newcnt; 304 struct sctp_stream_out *outs; 305 struct sctp_stream_queue_pending *sp, *nsp; 306 struct sctp_tmit_chunk *chk, *nchk; 307 308 /* abandon the upper streams */ 309 newcnt = ntohs(init->num_inbound_streams); 310 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) { 311 if (chk->rec.data.stream_number >= newcnt) { 312 TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next); 313 asoc->send_queue_cnt--; 314 if (chk->data != NULL) { 315 sctp_free_bufspace(stcb, asoc, chk, 1); 316 sctp_ulp_notify(SCTP_NOTIFY_UNSENT_DG_FAIL, stcb, 317 0, chk, SCTP_SO_NOT_LOCKED); 318 if (chk->data) { 319 sctp_m_freem(chk->data); 320 chk->data = NULL; 321 } 322 } 323 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 324 /* sa_ignore FREED_MEMORY */ 325 } 326 } 327 if (asoc->strmout) { 328 for (i = newcnt; i < asoc->pre_open_streams; i++) { 329 outs = &asoc->strmout[i]; 330 TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) { 331 TAILQ_REMOVE(&outs->outqueue, sp, next); 332 asoc->stream_queue_cnt--; 333 sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL, 334 stcb, 0, sp, SCTP_SO_NOT_LOCKED); 335 if (sp->data) { 336 sctp_m_freem(sp->data); 337 sp->data = NULL; 338 } 339 if (sp->net) { 340 sctp_free_remote_addr(sp->net); 341 sp->net = NULL; 342 } 343 /* Free the chunk */ 344 sctp_free_a_strmoq(stcb, sp, SCTP_SO_NOT_LOCKED); 345 /* sa_ignore FREED_MEMORY */ 346 } 347 } 348 } 349 /* cut back the count */ 350 asoc->pre_open_streams = newcnt; 351 } 352 SCTP_TCB_SEND_UNLOCK(stcb); 353 asoc->strm_realoutsize = asoc->streamoutcnt = asoc->pre_open_streams; 354 355 /* EY - nr_sack: initialize highest tsn in nr_mapping_array */ 356 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 357 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 358 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 359 } 360 /* This is the next one we expect */ 361 asoc->str_reset_seq_in = asoc->asconf_seq_in + 1; 362 363 asoc->mapping_array_base_tsn = ntohl(init->initial_tsn); 364 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in; 365 366 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 367 /* open the requested streams */ 368 369 if (asoc->strmin != NULL) { 370 /* Free the old ones */ 371 struct sctp_queued_to_read *ctl, *nctl; 372 373 for (i = 0; i < asoc->streamincnt; i++) { 374 TAILQ_FOREACH_SAFE(ctl, &asoc->strmin[i].inqueue, next, nctl) { 375 TAILQ_REMOVE(&asoc->strmin[i].inqueue, ctl, next); 376 sctp_free_remote_addr(ctl->whoFrom); 377 ctl->whoFrom = NULL; 378 sctp_m_freem(ctl->data); 379 ctl->data = NULL; 380 sctp_free_a_readq(stcb, ctl); 381 } 382 } 383 SCTP_FREE(asoc->strmin, SCTP_M_STRMI); 384 } 385 asoc->streamincnt = ntohs(init->num_outbound_streams); 386 if (asoc->streamincnt > MAX_SCTP_STREAMS) { 387 asoc->streamincnt = MAX_SCTP_STREAMS; 388 } 389 SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt * 390 sizeof(struct sctp_stream_in), SCTP_M_STRMI); 391 if (asoc->strmin == NULL) { 392 /* we didn't get memory for the streams! */ 393 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n"); 394 return (-1); 395 } 396 for (i = 0; i < asoc->streamincnt; i++) { 397 asoc->strmin[i].stream_no = i; 398 asoc->strmin[i].last_sequence_delivered = 0xffff; 399 /* 400 * U-stream ranges will be set when the cookie is unpacked. 401 * Or for the INIT sender they are un set (if pr-sctp not 402 * supported) when the INIT-ACK arrives. 403 */ 404 TAILQ_INIT(&asoc->strmin[i].inqueue); 405 asoc->strmin[i].delivery_started = 0; 406 } 407 /* 408 * load_address_from_init will put the addresses into the 409 * association when the COOKIE is processed or the INIT-ACK is 410 * processed. Both types of COOKIE's existing and new call this 411 * routine. It will remove addresses that are no longer in the 412 * association (for the restarting case where addresses are 413 * removed). Up front when the INIT arrives we will discard it if it 414 * is a restart and new addresses have been added. 415 */ 416 /* sa_ignore MEMLEAK */ 417 return (0); 418} 419 420/* 421 * INIT-ACK message processing/consumption returns value < 0 on error 422 */ 423static int 424sctp_process_init_ack(struct mbuf *m, int iphlen, int offset, 425 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 426 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 427 struct sctp_nets *net, int *abort_no_unlock, 428 uint8_t use_mflowid, uint32_t mflowid, 429 uint32_t vrf_id) 430{ 431 struct sctp_association *asoc; 432 struct mbuf *op_err; 433 int retval, abort_flag; 434 uint32_t initack_limit; 435 int nat_friendly = 0; 436 437 /* First verify that we have no illegal param's */ 438 abort_flag = 0; 439 op_err = NULL; 440 441 op_err = sctp_arethere_unrecognized_parameters(m, 442 (offset + sizeof(struct sctp_init_chunk)), 443 &abort_flag, (struct sctp_chunkhdr *)cp, &nat_friendly); 444 if (abort_flag) { 445 /* Send an abort and notify peer */ 446 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 447 *abort_no_unlock = 1; 448 return (-1); 449 } 450 asoc = &stcb->asoc; 451 asoc->peer_supports_nat = (uint8_t) nat_friendly; 452 /* process the peer's parameters in the INIT-ACK */ 453 retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb); 454 if (retval < 0) { 455 return (retval); 456 } 457 initack_limit = offset + ntohs(cp->ch.chunk_length); 458 /* load all addresses */ 459 if ((retval = sctp_load_addresses_from_init(stcb, m, 460 (offset + sizeof(struct sctp_init_chunk)), initack_limit, 461 src, dst, NULL))) { 462 /* Huh, we should abort */ 463 SCTPDBG(SCTP_DEBUG_INPUT1, 464 "Load addresses from INIT causes an abort %d\n", 465 retval); 466 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 467 src, dst, sh, NULL, 468 use_mflowid, mflowid, 469 vrf_id, net->port); 470 *abort_no_unlock = 1; 471 return (-1); 472 } 473 /* if the peer doesn't support asconf, flush the asconf queue */ 474 if (asoc->peer_supports_asconf == 0) { 475 struct sctp_asconf_addr *param, *nparam; 476 477 TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) { 478 TAILQ_REMOVE(&asoc->asconf_queue, param, next); 479 SCTP_FREE(param, SCTP_M_ASC_ADDR); 480 } 481 } 482 stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs, 483 stcb->asoc.local_hmacs); 484 if (op_err) { 485 sctp_queue_op_err(stcb, op_err); 486 /* queuing will steal away the mbuf chain to the out queue */ 487 op_err = NULL; 488 } 489 /* extract the cookie and queue it to "echo" it back... */ 490 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 491 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 492 stcb->asoc.overall_error_count, 493 0, 494 SCTP_FROM_SCTP_INPUT, 495 __LINE__); 496 } 497 stcb->asoc.overall_error_count = 0; 498 net->error_count = 0; 499 500 /* 501 * Cancel the INIT timer, We do this first before queueing the 502 * cookie. We always cancel at the primary to assue that we are 503 * canceling the timer started by the INIT which always goes to the 504 * primary. 505 */ 506 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb, 507 asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4); 508 509 /* calculate the RTO */ 510 net->RTO = sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, sctp_align_safe_nocopy, 511 SCTP_RTT_FROM_NON_DATA); 512 513 retval = sctp_send_cookie_echo(m, offset, stcb, net); 514 if (retval < 0) { 515 /* 516 * No cookie, we probably should send a op error. But in any 517 * case if there is no cookie in the INIT-ACK, we can 518 * abandon the peer, its broke. 519 */ 520 if (retval == -3) { 521 /* We abort with an error of missing mandatory param */ 522 op_err = 523 sctp_generate_invmanparam(SCTP_CAUSE_MISSING_PARAM); 524 if (op_err) { 525 /* 526 * Expand beyond to include the mandatory 527 * param cookie 528 */ 529 struct sctp_inv_mandatory_param *mp; 530 531 SCTP_BUF_LEN(op_err) = 532 sizeof(struct sctp_inv_mandatory_param); 533 mp = mtod(op_err, 534 struct sctp_inv_mandatory_param *); 535 /* Subtract the reserved param */ 536 mp->length = 537 htons(sizeof(struct sctp_inv_mandatory_param) - 2); 538 mp->num_param = htonl(1); 539 mp->param = htons(SCTP_STATE_COOKIE); 540 mp->resv = 0; 541 } 542 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 543 src, dst, sh, op_err, 544 use_mflowid, mflowid, 545 vrf_id, net->port); 546 *abort_no_unlock = 1; 547 } 548 return (retval); 549 } 550 return (0); 551} 552 553static void 554sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp, 555 struct sctp_tcb *stcb, struct sctp_nets *net) 556{ 557 struct sockaddr_storage store; 558 struct sctp_nets *r_net, *f_net; 559 struct timeval tv; 560 int req_prim = 0; 561 uint16_t old_error_counter; 562 563#ifdef INET 564 struct sockaddr_in *sin; 565 566#endif 567#ifdef INET6 568 struct sockaddr_in6 *sin6; 569 570#endif 571 572 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) { 573 /* Invalid length */ 574 return; 575 } 576 memset(&store, 0, sizeof(store)); 577 switch (cp->heartbeat.hb_info.addr_family) { 578#ifdef INET 579 case AF_INET: 580 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) { 581 sin = (struct sockaddr_in *)&store; 582 sin->sin_family = cp->heartbeat.hb_info.addr_family; 583 sin->sin_len = cp->heartbeat.hb_info.addr_len; 584 sin->sin_port = stcb->rport; 585 memcpy(&sin->sin_addr, cp->heartbeat.hb_info.address, 586 sizeof(sin->sin_addr)); 587 } else { 588 return; 589 } 590 break; 591#endif 592#ifdef INET6 593 case AF_INET6: 594 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) { 595 sin6 = (struct sockaddr_in6 *)&store; 596 sin6->sin6_family = cp->heartbeat.hb_info.addr_family; 597 sin6->sin6_len = cp->heartbeat.hb_info.addr_len; 598 sin6->sin6_port = stcb->rport; 599 memcpy(&sin6->sin6_addr, cp->heartbeat.hb_info.address, 600 sizeof(sin6->sin6_addr)); 601 } else { 602 return; 603 } 604 break; 605#endif 606 default: 607 return; 608 } 609 r_net = sctp_findnet(stcb, (struct sockaddr *)&store); 610 if (r_net == NULL) { 611 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n"); 612 return; 613 } 614 if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) && 615 (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) && 616 (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) { 617 /* 618 * If the its a HB and it's random value is correct when can 619 * confirm the destination. 620 */ 621 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 622 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) { 623 stcb->asoc.primary_destination = r_net; 624 r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY; 625 f_net = TAILQ_FIRST(&stcb->asoc.nets); 626 if (f_net != r_net) { 627 /* 628 * first one on the list is NOT the primary 629 * sctp_cmpaddr() is much more efficent if 630 * the primary is the first on the list, 631 * make it so. 632 */ 633 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next); 634 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next); 635 } 636 req_prim = 1; 637 } 638 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 639 stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 640 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3); 641 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 642 } 643 old_error_counter = r_net->error_count; 644 r_net->error_count = 0; 645 r_net->hb_responded = 1; 646 tv.tv_sec = cp->heartbeat.hb_info.time_value_1; 647 tv.tv_usec = cp->heartbeat.hb_info.time_value_2; 648 /* Now lets do a RTO with this */ 649 r_net->RTO = sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, sctp_align_safe_nocopy, 650 SCTP_RTT_FROM_NON_DATA); 651 if (!(r_net->dest_state & SCTP_ADDR_REACHABLE)) { 652 r_net->dest_state |= SCTP_ADDR_REACHABLE; 653 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb, 654 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 655 } 656 if (r_net->dest_state & SCTP_ADDR_PF) { 657 r_net->dest_state &= ~SCTP_ADDR_PF; 658 stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net); 659 } 660 if (old_error_counter > 0) { 661 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3); 662 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 663 } 664 if (r_net == stcb->asoc.primary_destination) { 665 if (stcb->asoc.alternate) { 666 /* release the alternate, primary is good */ 667 sctp_free_remote_addr(stcb->asoc.alternate); 668 stcb->asoc.alternate = NULL; 669 } 670 } 671 /* Mobility adaptation */ 672 if (req_prim) { 673 if ((sctp_is_mobility_feature_on(stcb->sctp_ep, 674 SCTP_MOBILITY_BASE) || 675 sctp_is_mobility_feature_on(stcb->sctp_ep, 676 SCTP_MOBILITY_FASTHANDOFF)) && 677 sctp_is_mobility_feature_on(stcb->sctp_ep, 678 SCTP_MOBILITY_PRIM_DELETED)) { 679 680 sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED, stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_TIMER + SCTP_LOC_7); 681 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 682 SCTP_MOBILITY_FASTHANDOFF)) { 683 sctp_assoc_immediate_retrans(stcb, 684 stcb->asoc.primary_destination); 685 } 686 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 687 SCTP_MOBILITY_BASE)) { 688 sctp_move_chunks_from_net(stcb, 689 stcb->asoc.deleted_primary); 690 } 691 sctp_delete_prim_timer(stcb->sctp_ep, stcb, 692 stcb->asoc.deleted_primary); 693 } 694 } 695} 696 697static int 698sctp_handle_nat_colliding_state(struct sctp_tcb *stcb) 699{ 700 /* 701 * return 0 means we want you to proceed with the abort non-zero 702 * means no abort processing 703 */ 704 struct sctpasochead *head; 705 706 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_WAIT) { 707 /* generate a new vtag and send init */ 708 LIST_REMOVE(stcb, sctp_asocs); 709 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 710 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 711 /* 712 * put it in the bucket in the vtag hash of assoc's for the 713 * system 714 */ 715 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 716 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 717 return (1); 718 } 719 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) { 720 /* 721 * treat like a case where the cookie expired i.e.: - dump 722 * current cookie. - generate a new vtag. - resend init. 723 */ 724 /* generate a new vtag and send init */ 725 LIST_REMOVE(stcb, sctp_asocs); 726 stcb->asoc.state &= ~SCTP_STATE_COOKIE_ECHOED; 727 stcb->asoc.state |= SCTP_STATE_COOKIE_WAIT; 728 sctp_stop_all_cookie_timers(stcb); 729 sctp_toss_old_cookies(stcb, &stcb->asoc); 730 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 731 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 732 /* 733 * put it in the bucket in the vtag hash of assoc's for the 734 * system 735 */ 736 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 737 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 738 return (1); 739 } 740 return (0); 741} 742 743static int 744sctp_handle_nat_missing_state(struct sctp_tcb *stcb, 745 struct sctp_nets *net) 746{ 747 /* 748 * return 0 means we want you to proceed with the abort non-zero 749 * means no abort processing 750 */ 751 if (stcb->asoc.peer_supports_auth == 0) { 752 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n"); 753 return (0); 754 } 755 sctp_asconf_send_nat_state_update(stcb, net); 756 return (1); 757} 758 759 760static void 761sctp_handle_abort(struct sctp_abort_chunk *abort, 762 struct sctp_tcb *stcb, struct sctp_nets *net) 763{ 764#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 765 struct socket *so; 766 767#endif 768 uint16_t len; 769 uint16_t error; 770 771 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n"); 772 if (stcb == NULL) 773 return; 774 775 len = ntohs(abort->ch.chunk_length); 776 if (len > sizeof(struct sctp_chunkhdr)) { 777 /* 778 * Need to check the cause codes for our two magic nat 779 * aborts which don't kill the assoc necessarily. 780 */ 781 struct sctp_missing_nat_state *natc; 782 783 natc = (struct sctp_missing_nat_state *)(abort + 1); 784 error = ntohs(natc->cause); 785 if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) { 786 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n", 787 abort->ch.chunk_flags); 788 if (sctp_handle_nat_colliding_state(stcb)) { 789 return; 790 } 791 } else if (error == SCTP_CAUSE_NAT_MISSING_STATE) { 792 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n", 793 abort->ch.chunk_flags); 794 if (sctp_handle_nat_missing_state(stcb, net)) { 795 return; 796 } 797 } 798 } else { 799 error = 0; 800 } 801 /* stop any receive timers */ 802 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_6); 803 /* notify user of the abort and clean up... */ 804 sctp_abort_notification(stcb, 1, error, abort, SCTP_SO_NOT_LOCKED); 805 /* free the tcb */ 806 SCTP_STAT_INCR_COUNTER32(sctps_aborted); 807 if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) || 808 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 809 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 810 } 811#ifdef SCTP_ASOCLOG_OF_TSNS 812 sctp_print_out_track_log(stcb); 813#endif 814#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 815 so = SCTP_INP_SO(stcb->sctp_ep); 816 atomic_add_int(&stcb->asoc.refcnt, 1); 817 SCTP_TCB_UNLOCK(stcb); 818 SCTP_SOCKET_LOCK(so, 1); 819 SCTP_TCB_LOCK(stcb); 820 atomic_subtract_int(&stcb->asoc.refcnt, 1); 821#endif 822 stcb->asoc.state |= SCTP_STATE_WAS_ABORTED; 823 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 824 SCTP_FROM_SCTP_INPUT + SCTP_LOC_6); 825#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 826 SCTP_SOCKET_UNLOCK(so, 1); 827#endif 828 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n"); 829} 830 831static void 832sctp_start_net_timers(struct sctp_tcb *stcb) 833{ 834 uint32_t cnt_hb_sent; 835 struct sctp_nets *net; 836 837 cnt_hb_sent = 0; 838 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 839 /* 840 * For each network start: 1) A pmtu timer. 2) A HB timer 3) 841 * If the dest in unconfirmed send a hb as well if under 842 * max_hb_burst have been sent. 843 */ 844 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net); 845 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net); 846 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) && 847 (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) { 848 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 849 cnt_hb_sent++; 850 } 851 } 852 if (cnt_hb_sent) { 853 sctp_chunk_output(stcb->sctp_ep, stcb, 854 SCTP_OUTPUT_FROM_COOKIE_ACK, 855 SCTP_SO_NOT_LOCKED); 856 } 857} 858 859 860static void 861sctp_handle_shutdown(struct sctp_shutdown_chunk *cp, 862 struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag) 863{ 864 struct sctp_association *asoc; 865 int some_on_streamwheel; 866 867#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 868 struct socket *so; 869 870#endif 871 872 SCTPDBG(SCTP_DEBUG_INPUT2, 873 "sctp_handle_shutdown: handling SHUTDOWN\n"); 874 if (stcb == NULL) 875 return; 876 asoc = &stcb->asoc; 877 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) || 878 (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) { 879 return; 880 } 881 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) { 882 /* Shutdown NOT the expected size */ 883 return; 884 } else { 885 sctp_update_acked(stcb, cp, abort_flag); 886 if (*abort_flag) { 887 return; 888 } 889 } 890 if (asoc->control_pdapi) { 891 /* 892 * With a normal shutdown we assume the end of last record. 893 */ 894 SCTP_INP_READ_LOCK(stcb->sctp_ep); 895 asoc->control_pdapi->end_added = 1; 896 asoc->control_pdapi->pdapi_aborted = 1; 897 asoc->control_pdapi = NULL; 898 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 899#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 900 so = SCTP_INP_SO(stcb->sctp_ep); 901 atomic_add_int(&stcb->asoc.refcnt, 1); 902 SCTP_TCB_UNLOCK(stcb); 903 SCTP_SOCKET_LOCK(so, 1); 904 SCTP_TCB_LOCK(stcb); 905 atomic_subtract_int(&stcb->asoc.refcnt, 1); 906 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 907 /* assoc was freed while we were unlocked */ 908 SCTP_SOCKET_UNLOCK(so, 1); 909 return; 910 } 911#endif 912 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 913#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 914 SCTP_SOCKET_UNLOCK(so, 1); 915#endif 916 } 917 /* goto SHUTDOWN_RECEIVED state to block new requests */ 918 if (stcb->sctp_socket) { 919 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) && 920 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) && 921 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) { 922 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_RECEIVED); 923 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 924 /* 925 * notify upper layer that peer has initiated a 926 * shutdown 927 */ 928 sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 929 930 /* reset time */ 931 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 932 } 933 } 934 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) { 935 /* 936 * stop the shutdown timer, since we WILL move to 937 * SHUTDOWN-ACK-SENT. 938 */ 939 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_8); 940 } 941 /* Now is there unsent data on a stream somewhere? */ 942 some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED); 943 944 if (!TAILQ_EMPTY(&asoc->send_queue) || 945 !TAILQ_EMPTY(&asoc->sent_queue) || 946 some_on_streamwheel) { 947 /* By returning we will push more data out */ 948 return; 949 } else { 950 /* no outstanding data to send, so move on... */ 951 /* send SHUTDOWN-ACK */ 952 sctp_send_shutdown_ack(stcb, net); 953 /* move to SHUTDOWN-ACK-SENT state */ 954 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) || 955 (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 956 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 957 } 958 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT); 959 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 960 sctp_stop_timers_for_shutdown(stcb); 961 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, 962 stcb, net); 963 } 964} 965 966static void 967sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED, 968 struct sctp_tcb *stcb, 969 struct sctp_nets *net) 970{ 971 struct sctp_association *asoc; 972 973#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 974 struct socket *so; 975 976 so = SCTP_INP_SO(stcb->sctp_ep); 977#endif 978 SCTPDBG(SCTP_DEBUG_INPUT2, 979 "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n"); 980 if (stcb == NULL) 981 return; 982 983 asoc = &stcb->asoc; 984 /* process according to association state */ 985 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) || 986 (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) { 987 /* unexpected SHUTDOWN-ACK... do OOTB handling... */ 988 sctp_send_shutdown_complete(stcb, net, 1); 989 SCTP_TCB_UNLOCK(stcb); 990 return; 991 } 992 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) && 993 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) { 994 /* unexpected SHUTDOWN-ACK... so ignore... */ 995 SCTP_TCB_UNLOCK(stcb); 996 return; 997 } 998 if (asoc->control_pdapi) { 999 /* 1000 * With a normal shutdown we assume the end of last record. 1001 */ 1002 SCTP_INP_READ_LOCK(stcb->sctp_ep); 1003 asoc->control_pdapi->end_added = 1; 1004 asoc->control_pdapi->pdapi_aborted = 1; 1005 asoc->control_pdapi = NULL; 1006 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 1007#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1008 atomic_add_int(&stcb->asoc.refcnt, 1); 1009 SCTP_TCB_UNLOCK(stcb); 1010 SCTP_SOCKET_LOCK(so, 1); 1011 SCTP_TCB_LOCK(stcb); 1012 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1013 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1014 /* assoc was freed while we were unlocked */ 1015 SCTP_SOCKET_UNLOCK(so, 1); 1016 return; 1017 } 1018#endif 1019 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 1020#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1021 SCTP_SOCKET_UNLOCK(so, 1); 1022#endif 1023 } 1024 /* are the queues empty? */ 1025 if (!TAILQ_EMPTY(&asoc->send_queue) || 1026 !TAILQ_EMPTY(&asoc->sent_queue) || 1027 !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 1028 sctp_report_all_outbound(stcb, 0, 0, SCTP_SO_NOT_LOCKED); 1029 } 1030 /* stop the timer */ 1031 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9); 1032 /* send SHUTDOWN-COMPLETE */ 1033 sctp_send_shutdown_complete(stcb, net, 0); 1034 /* notify upper layer protocol */ 1035 if (stcb->sctp_socket) { 1036 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1037 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 1038 stcb->sctp_socket->so_snd.sb_cc = 0; 1039 } 1040 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 1041 } 1042 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 1043 /* free the TCB but first save off the ep */ 1044#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1045 atomic_add_int(&stcb->asoc.refcnt, 1); 1046 SCTP_TCB_UNLOCK(stcb); 1047 SCTP_SOCKET_LOCK(so, 1); 1048 SCTP_TCB_LOCK(stcb); 1049 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1050#endif 1051 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1052 SCTP_FROM_SCTP_INPUT + SCTP_LOC_10); 1053#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1054 SCTP_SOCKET_UNLOCK(so, 1); 1055#endif 1056} 1057 1058/* 1059 * Skip past the param header and then we will find the chunk that caused the 1060 * problem. There are two possiblities ASCONF or FWD-TSN other than that and 1061 * our peer must be broken. 1062 */ 1063static void 1064sctp_process_unrecog_chunk(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr, 1065 struct sctp_nets *net) 1066{ 1067 struct sctp_chunkhdr *chk; 1068 1069 chk = (struct sctp_chunkhdr *)((caddr_t)phdr + sizeof(*phdr)); 1070 switch (chk->chunk_type) { 1071 case SCTP_ASCONF_ACK: 1072 case SCTP_ASCONF: 1073 sctp_asconf_cleanup(stcb, net); 1074 break; 1075 case SCTP_FORWARD_CUM_TSN: 1076 stcb->asoc.peer_supports_prsctp = 0; 1077 break; 1078 default: 1079 SCTPDBG(SCTP_DEBUG_INPUT2, 1080 "Peer does not support chunk type %d(%x)??\n", 1081 chk->chunk_type, (uint32_t) chk->chunk_type); 1082 break; 1083 } 1084} 1085 1086/* 1087 * Skip past the param header and then we will find the param that caused the 1088 * problem. There are a number of param's in a ASCONF OR the prsctp param 1089 * these will turn of specific features. 1090 */ 1091static void 1092sctp_process_unrecog_param(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr) 1093{ 1094 struct sctp_paramhdr *pbad; 1095 1096 pbad = phdr + 1; 1097 switch (ntohs(pbad->param_type)) { 1098 /* pr-sctp draft */ 1099 case SCTP_PRSCTP_SUPPORTED: 1100 stcb->asoc.peer_supports_prsctp = 0; 1101 break; 1102 case SCTP_SUPPORTED_CHUNK_EXT: 1103 break; 1104 /* draft-ietf-tsvwg-addip-sctp */ 1105 case SCTP_HAS_NAT_SUPPORT: 1106 stcb->asoc.peer_supports_nat = 0; 1107 break; 1108 case SCTP_ADD_IP_ADDRESS: 1109 case SCTP_DEL_IP_ADDRESS: 1110 case SCTP_SET_PRIM_ADDR: 1111 stcb->asoc.peer_supports_asconf = 0; 1112 break; 1113 case SCTP_SUCCESS_REPORT: 1114 case SCTP_ERROR_CAUSE_IND: 1115 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n"); 1116 SCTPDBG(SCTP_DEBUG_INPUT2, 1117 "Turning off ASCONF to this strange peer\n"); 1118 stcb->asoc.peer_supports_asconf = 0; 1119 break; 1120 default: 1121 SCTPDBG(SCTP_DEBUG_INPUT2, 1122 "Peer does not support param type %d(%x)??\n", 1123 pbad->param_type, (uint32_t) pbad->param_type); 1124 break; 1125 } 1126} 1127 1128static int 1129sctp_handle_error(struct sctp_chunkhdr *ch, 1130 struct sctp_tcb *stcb, struct sctp_nets *net) 1131{ 1132 int chklen; 1133 struct sctp_paramhdr *phdr; 1134 uint16_t error, error_type; 1135 uint16_t error_len; 1136 struct sctp_association *asoc; 1137 int adjust; 1138 1139#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1140 struct socket *so; 1141 1142#endif 1143 1144 /* parse through all of the errors and process */ 1145 asoc = &stcb->asoc; 1146 phdr = (struct sctp_paramhdr *)((caddr_t)ch + 1147 sizeof(struct sctp_chunkhdr)); 1148 chklen = ntohs(ch->chunk_length) - sizeof(struct sctp_chunkhdr); 1149 error = 0; 1150 while ((size_t)chklen >= sizeof(struct sctp_paramhdr)) { 1151 /* Process an Error Cause */ 1152 error_type = ntohs(phdr->param_type); 1153 error_len = ntohs(phdr->param_length); 1154 if ((error_len > chklen) || (error_len == 0)) { 1155 /* invalid param length for this param */ 1156 SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in error param- chunk left:%d errorlen:%d\n", 1157 chklen, error_len); 1158 return (0); 1159 } 1160 if (error == 0) { 1161 /* report the first error cause */ 1162 error = error_type; 1163 } 1164 switch (error_type) { 1165 case SCTP_CAUSE_INVALID_STREAM: 1166 case SCTP_CAUSE_MISSING_PARAM: 1167 case SCTP_CAUSE_INVALID_PARAM: 1168 case SCTP_CAUSE_NO_USER_DATA: 1169 SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %d back? We have a bug :/ (or do they?)\n", 1170 error_type); 1171 break; 1172 case SCTP_CAUSE_NAT_COLLIDING_STATE: 1173 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n", 1174 ch->chunk_flags); 1175 if (sctp_handle_nat_colliding_state(stcb)) { 1176 return (0); 1177 } 1178 break; 1179 case SCTP_CAUSE_NAT_MISSING_STATE: 1180 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n", 1181 ch->chunk_flags); 1182 if (sctp_handle_nat_missing_state(stcb, net)) { 1183 return (0); 1184 } 1185 break; 1186 case SCTP_CAUSE_STALE_COOKIE: 1187 /* 1188 * We only act if we have echoed a cookie and are 1189 * waiting. 1190 */ 1191 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) { 1192 int *p; 1193 1194 p = (int *)((caddr_t)phdr + sizeof(*phdr)); 1195 /* Save the time doubled */ 1196 asoc->cookie_preserve_req = ntohl(*p) << 1; 1197 asoc->stale_cookie_count++; 1198 if (asoc->stale_cookie_count > 1199 asoc->max_init_times) { 1200 sctp_abort_notification(stcb, 0, 0, NULL, SCTP_SO_NOT_LOCKED); 1201 /* now free the asoc */ 1202#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1203 so = SCTP_INP_SO(stcb->sctp_ep); 1204 atomic_add_int(&stcb->asoc.refcnt, 1); 1205 SCTP_TCB_UNLOCK(stcb); 1206 SCTP_SOCKET_LOCK(so, 1); 1207 SCTP_TCB_LOCK(stcb); 1208 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1209#endif 1210 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1211 SCTP_FROM_SCTP_INPUT + SCTP_LOC_11); 1212#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1213 SCTP_SOCKET_UNLOCK(so, 1); 1214#endif 1215 return (-1); 1216 } 1217 /* blast back to INIT state */ 1218 sctp_toss_old_cookies(stcb, &stcb->asoc); 1219 asoc->state &= ~SCTP_STATE_COOKIE_ECHOED; 1220 asoc->state |= SCTP_STATE_COOKIE_WAIT; 1221 sctp_stop_all_cookie_timers(stcb); 1222 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 1223 } 1224 break; 1225 case SCTP_CAUSE_UNRESOLVABLE_ADDR: 1226 /* 1227 * Nothing we can do here, we don't do hostname 1228 * addresses so if the peer does not like my IPv6 1229 * (or IPv4 for that matter) it does not matter. If 1230 * they don't support that type of address, they can 1231 * NOT possibly get that packet type... i.e. with no 1232 * IPv6 you can't recieve a IPv6 packet. so we can 1233 * safely ignore this one. If we ever added support 1234 * for HOSTNAME Addresses, then we would need to do 1235 * something here. 1236 */ 1237 break; 1238 case SCTP_CAUSE_UNRECOG_CHUNK: 1239 sctp_process_unrecog_chunk(stcb, phdr, net); 1240 break; 1241 case SCTP_CAUSE_UNRECOG_PARAM: 1242 sctp_process_unrecog_param(stcb, phdr); 1243 break; 1244 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN: 1245 /* 1246 * We ignore this since the timer will drive out a 1247 * new cookie anyway and there timer will drive us 1248 * to send a SHUTDOWN_COMPLETE. We can't send one 1249 * here since we don't have their tag. 1250 */ 1251 break; 1252 case SCTP_CAUSE_DELETING_LAST_ADDR: 1253 case SCTP_CAUSE_RESOURCE_SHORTAGE: 1254 case SCTP_CAUSE_DELETING_SRC_ADDR: 1255 /* 1256 * We should NOT get these here, but in a 1257 * ASCONF-ACK. 1258 */ 1259 SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a Operational Error?<%d>?\n", 1260 error_type); 1261 break; 1262 case SCTP_CAUSE_OUT_OF_RESC: 1263 /* 1264 * And what, pray tell do we do with the fact that 1265 * the peer is out of resources? Not really sure we 1266 * could do anything but abort. I suspect this 1267 * should have came WITH an abort instead of in a 1268 * OP-ERROR. 1269 */ 1270 break; 1271 default: 1272 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown error type = 0x%xh\n", 1273 error_type); 1274 break; 1275 } 1276 adjust = SCTP_SIZE32(error_len); 1277 chklen -= adjust; 1278 phdr = (struct sctp_paramhdr *)((caddr_t)phdr + adjust); 1279 } 1280 sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, error, ch, SCTP_SO_NOT_LOCKED); 1281 return (0); 1282} 1283 1284static int 1285sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset, 1286 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 1287 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 1288 struct sctp_nets *net, int *abort_no_unlock, 1289 uint8_t use_mflowid, uint32_t mflowid, 1290 uint32_t vrf_id) 1291{ 1292 struct sctp_init_ack *init_ack; 1293 struct mbuf *op_err; 1294 1295 SCTPDBG(SCTP_DEBUG_INPUT2, 1296 "sctp_handle_init_ack: handling INIT-ACK\n"); 1297 1298 if (stcb == NULL) { 1299 SCTPDBG(SCTP_DEBUG_INPUT2, 1300 "sctp_handle_init_ack: TCB is null\n"); 1301 return (-1); 1302 } 1303 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) { 1304 /* Invalid length */ 1305 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 1306 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1307 src, dst, sh, op_err, 1308 use_mflowid, mflowid, 1309 vrf_id, net->port); 1310 *abort_no_unlock = 1; 1311 return (-1); 1312 } 1313 init_ack = &cp->init; 1314 /* validate parameters */ 1315 if (init_ack->initiate_tag == 0) { 1316 /* protocol error... send an abort */ 1317 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 1318 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1319 src, dst, sh, op_err, 1320 use_mflowid, mflowid, 1321 vrf_id, net->port); 1322 *abort_no_unlock = 1; 1323 return (-1); 1324 } 1325 if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) { 1326 /* protocol error... send an abort */ 1327 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 1328 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1329 src, dst, sh, op_err, 1330 use_mflowid, mflowid, 1331 vrf_id, net->port); 1332 *abort_no_unlock = 1; 1333 return (-1); 1334 } 1335 if (init_ack->num_inbound_streams == 0) { 1336 /* protocol error... send an abort */ 1337 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 1338 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1339 src, dst, sh, op_err, 1340 use_mflowid, mflowid, 1341 vrf_id, net->port); 1342 *abort_no_unlock = 1; 1343 return (-1); 1344 } 1345 if (init_ack->num_outbound_streams == 0) { 1346 /* protocol error... send an abort */ 1347 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 1348 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1349 src, dst, sh, op_err, 1350 use_mflowid, mflowid, 1351 vrf_id, net->port); 1352 *abort_no_unlock = 1; 1353 return (-1); 1354 } 1355 /* process according to association state... */ 1356 switch (stcb->asoc.state & SCTP_STATE_MASK) { 1357 case SCTP_STATE_COOKIE_WAIT: 1358 /* this is the expected state for this chunk */ 1359 /* process the INIT-ACK parameters */ 1360 if (stcb->asoc.primary_destination->dest_state & 1361 SCTP_ADDR_UNCONFIRMED) { 1362 /* 1363 * The primary is where we sent the INIT, we can 1364 * always consider it confirmed when the INIT-ACK is 1365 * returned. Do this before we load addresses 1366 * though. 1367 */ 1368 stcb->asoc.primary_destination->dest_state &= 1369 ~SCTP_ADDR_UNCONFIRMED; 1370 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 1371 stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED); 1372 } 1373 if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb, 1374 net, abort_no_unlock, 1375 use_mflowid, mflowid, 1376 vrf_id) < 0) { 1377 /* error in parsing parameters */ 1378 return (-1); 1379 } 1380 /* update our state */ 1381 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n"); 1382 SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_ECHOED); 1383 1384 /* reset the RTO calc */ 1385 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 1386 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 1387 stcb->asoc.overall_error_count, 1388 0, 1389 SCTP_FROM_SCTP_INPUT, 1390 __LINE__); 1391 } 1392 stcb->asoc.overall_error_count = 0; 1393 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 1394 /* 1395 * collapse the init timer back in case of a exponential 1396 * backoff 1397 */ 1398 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep, 1399 stcb, net); 1400 /* 1401 * the send at the end of the inbound data processing will 1402 * cause the cookie to be sent 1403 */ 1404 break; 1405 case SCTP_STATE_SHUTDOWN_SENT: 1406 /* incorrect state... discard */ 1407 break; 1408 case SCTP_STATE_COOKIE_ECHOED: 1409 /* incorrect state... discard */ 1410 break; 1411 case SCTP_STATE_OPEN: 1412 /* incorrect state... discard */ 1413 break; 1414 case SCTP_STATE_EMPTY: 1415 case SCTP_STATE_INUSE: 1416 default: 1417 /* incorrect state... discard */ 1418 return (-1); 1419 break; 1420 } 1421 SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n"); 1422 return (0); 1423} 1424 1425static struct sctp_tcb * 1426sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1427 struct sockaddr *src, struct sockaddr *dst, 1428 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1429 struct sctp_inpcb *inp, struct sctp_nets **netp, 1430 struct sockaddr *init_src, int *notification, 1431 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1432 uint8_t use_mflowid, uint32_t mflowid, 1433 uint32_t vrf_id, uint16_t port); 1434 1435 1436/* 1437 * handle a state cookie for an existing association m: input packet mbuf 1438 * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a 1439 * "split" mbuf and the cookie signature does not exist offset: offset into 1440 * mbuf to the cookie-echo chunk 1441 */ 1442static struct sctp_tcb * 1443sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset, 1444 struct sockaddr *src, struct sockaddr *dst, 1445 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1446 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp, 1447 struct sockaddr *init_src, int *notification, 1448 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1449 uint8_t use_mflowid, uint32_t mflowid, 1450 uint32_t vrf_id, uint16_t port) 1451{ 1452 struct sctp_association *asoc; 1453 struct sctp_init_chunk *init_cp, init_buf; 1454 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1455 struct sctp_nets *net; 1456 struct mbuf *op_err; 1457 struct sctp_paramhdr *ph; 1458 int init_offset, initack_offset, i; 1459 int retval; 1460 int spec_flag = 0; 1461 uint32_t how_indx; 1462 1463 net = *netp; 1464 /* I know that the TCB is non-NULL from the caller */ 1465 asoc = &stcb->asoc; 1466 for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) { 1467 if (asoc->cookie_how[how_indx] == 0) 1468 break; 1469 } 1470 if (how_indx < sizeof(asoc->cookie_how)) { 1471 asoc->cookie_how[how_indx] = 1; 1472 } 1473 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 1474 /* SHUTDOWN came in after sending INIT-ACK */ 1475 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination); 1476 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 1477 0, M_DONTWAIT, 1, MT_DATA); 1478 if (op_err == NULL) { 1479 /* FOOBAR */ 1480 return (NULL); 1481 } 1482 /* Set the len */ 1483 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_paramhdr); 1484 ph = mtod(op_err, struct sctp_paramhdr *); 1485 ph->param_type = htons(SCTP_CAUSE_COOKIE_IN_SHUTDOWN); 1486 ph->param_length = htons(sizeof(struct sctp_paramhdr)); 1487 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 1488 use_mflowid, mflowid, 1489 vrf_id, net->port); 1490 if (how_indx < sizeof(asoc->cookie_how)) 1491 asoc->cookie_how[how_indx] = 2; 1492 return (NULL); 1493 } 1494 /* 1495 * find and validate the INIT chunk in the cookie (peer's info) the 1496 * INIT should start after the cookie-echo header struct (chunk 1497 * header, state cookie header struct) 1498 */ 1499 init_offset = offset += sizeof(struct sctp_cookie_echo_chunk); 1500 1501 init_cp = (struct sctp_init_chunk *) 1502 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 1503 (uint8_t *) & init_buf); 1504 if (init_cp == NULL) { 1505 /* could not pull a INIT chunk in cookie */ 1506 return (NULL); 1507 } 1508 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 1509 return (NULL); 1510 } 1511 /* 1512 * find and validate the INIT-ACK chunk in the cookie (my info) the 1513 * INIT-ACK follows the INIT chunk 1514 */ 1515 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 1516 initack_cp = (struct sctp_init_ack_chunk *) 1517 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 1518 (uint8_t *) & initack_buf); 1519 if (initack_cp == NULL) { 1520 /* could not pull INIT-ACK chunk in cookie */ 1521 return (NULL); 1522 } 1523 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 1524 return (NULL); 1525 } 1526 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1527 (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) { 1528 /* 1529 * case D in Section 5.2.4 Table 2: MMAA process accordingly 1530 * to get into the OPEN state 1531 */ 1532 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1533 /*- 1534 * Opps, this means that we somehow generated two vtag's 1535 * the same. I.e. we did: 1536 * Us Peer 1537 * <---INIT(tag=a)------ 1538 * ----INIT-ACK(tag=t)--> 1539 * ----INIT(tag=t)------> *1 1540 * <---INIT-ACK(tag=a)--- 1541 * <----CE(tag=t)------------- *2 1542 * 1543 * At point *1 we should be generating a different 1544 * tag t'. Which means we would throw away the CE and send 1545 * ours instead. Basically this is case C (throw away side). 1546 */ 1547 if (how_indx < sizeof(asoc->cookie_how)) 1548 asoc->cookie_how[how_indx] = 17; 1549 return (NULL); 1550 1551 } 1552 switch SCTP_GET_STATE 1553 (asoc) { 1554 case SCTP_STATE_COOKIE_WAIT: 1555 case SCTP_STATE_COOKIE_ECHOED: 1556 /* 1557 * INIT was sent but got a COOKIE_ECHO with the 1558 * correct tags... just accept it...but we must 1559 * process the init so that we can make sure we have 1560 * the right seq no's. 1561 */ 1562 /* First we must process the INIT !! */ 1563 retval = sctp_process_init(init_cp, stcb); 1564 if (retval < 0) { 1565 if (how_indx < sizeof(asoc->cookie_how)) 1566 asoc->cookie_how[how_indx] = 3; 1567 return (NULL); 1568 } 1569 /* we have already processed the INIT so no problem */ 1570 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, 1571 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_12); 1572 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_13); 1573 /* update current state */ 1574 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) 1575 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1576 else 1577 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1578 1579 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1580 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1581 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1582 stcb->sctp_ep, stcb, asoc->primary_destination); 1583 } 1584 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1585 sctp_stop_all_cookie_timers(stcb); 1586 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1587 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1588 (inp->sctp_socket->so_qlimit == 0) 1589 ) { 1590#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1591 struct socket *so; 1592 1593#endif 1594 /* 1595 * Here is where collision would go if we 1596 * did a connect() and instead got a 1597 * init/init-ack/cookie done before the 1598 * init-ack came back.. 1599 */ 1600 stcb->sctp_ep->sctp_flags |= 1601 SCTP_PCB_FLAGS_CONNECTED; 1602#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1603 so = SCTP_INP_SO(stcb->sctp_ep); 1604 atomic_add_int(&stcb->asoc.refcnt, 1); 1605 SCTP_TCB_UNLOCK(stcb); 1606 SCTP_SOCKET_LOCK(so, 1); 1607 SCTP_TCB_LOCK(stcb); 1608 atomic_add_int(&stcb->asoc.refcnt, -1); 1609 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1610 SCTP_SOCKET_UNLOCK(so, 1); 1611 return (NULL); 1612 } 1613#endif 1614 soisconnected(stcb->sctp_socket); 1615#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1616 SCTP_SOCKET_UNLOCK(so, 1); 1617#endif 1618 } 1619 /* notify upper layer */ 1620 *notification = SCTP_NOTIFY_ASSOC_UP; 1621 /* 1622 * since we did not send a HB make sure we don't 1623 * double things 1624 */ 1625 net->hb_responded = 1; 1626 net->RTO = sctp_calculate_rto(stcb, asoc, net, 1627 &cookie->time_entered, 1628 sctp_align_unsafe_makecopy, 1629 SCTP_RTT_FROM_NON_DATA); 1630 1631 if (stcb->asoc.sctp_autoclose_ticks && 1632 (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) { 1633 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 1634 inp, stcb, NULL); 1635 } 1636 break; 1637 default: 1638 /* 1639 * we're in the OPEN state (or beyond), so peer must 1640 * have simply lost the COOKIE-ACK 1641 */ 1642 break; 1643 } /* end switch */ 1644 sctp_stop_all_cookie_timers(stcb); 1645 /* 1646 * We ignore the return code here.. not sure if we should 1647 * somehow abort.. but we do have an existing asoc. This 1648 * really should not fail. 1649 */ 1650 if (sctp_load_addresses_from_init(stcb, m, 1651 init_offset + sizeof(struct sctp_init_chunk), 1652 initack_offset, src, dst, init_src)) { 1653 if (how_indx < sizeof(asoc->cookie_how)) 1654 asoc->cookie_how[how_indx] = 4; 1655 return (NULL); 1656 } 1657 /* respond with a COOKIE-ACK */ 1658 sctp_toss_old_cookies(stcb, asoc); 1659 sctp_send_cookie_ack(stcb); 1660 if (how_indx < sizeof(asoc->cookie_how)) 1661 asoc->cookie_how[how_indx] = 5; 1662 return (stcb); 1663 } 1664 if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1665 ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag && 1666 cookie->tie_tag_my_vtag == 0 && 1667 cookie->tie_tag_peer_vtag == 0) { 1668 /* 1669 * case C in Section 5.2.4 Table 2: XMOO silently discard 1670 */ 1671 if (how_indx < sizeof(asoc->cookie_how)) 1672 asoc->cookie_how[how_indx] = 6; 1673 return (NULL); 1674 } 1675 /* 1676 * If nat support, and the below and stcb is established, send back 1677 * a ABORT(colliding state) if we are established. 1678 */ 1679 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) && 1680 (asoc->peer_supports_nat) && 1681 ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1682 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1683 (asoc->peer_vtag == 0)))) { 1684 /* 1685 * Special case - Peer's support nat. We may have two init's 1686 * that we gave out the same tag on since one was not 1687 * established.. i.e. we get INIT from host-1 behind the nat 1688 * and we respond tag-a, we get a INIT from host-2 behind 1689 * the nat and we get tag-a again. Then we bring up host-1 1690 * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1). 1691 * Now we have colliding state. We must send an abort here 1692 * with colliding state indication. 1693 */ 1694 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 1695 0, M_DONTWAIT, 1, MT_DATA); 1696 if (op_err == NULL) { 1697 /* FOOBAR */ 1698 return (NULL); 1699 } 1700 /* pre-reserve some space */ 1701#ifdef INET6 1702 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr)); 1703#else 1704 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip)); 1705#endif 1706 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr)); 1707 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr)); 1708 /* Set the len */ 1709 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_paramhdr); 1710 ph = mtod(op_err, struct sctp_paramhdr *); 1711 ph->param_type = htons(SCTP_CAUSE_NAT_COLLIDING_STATE); 1712 ph->param_length = htons(sizeof(struct sctp_paramhdr)); 1713 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err, 1714 use_mflowid, mflowid, 1715 vrf_id, port); 1716 return (NULL); 1717 } 1718 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1719 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1720 (asoc->peer_vtag == 0))) { 1721 /* 1722 * case B in Section 5.2.4 Table 2: MXAA or MOAA my info 1723 * should be ok, re-accept peer info 1724 */ 1725 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1726 /* 1727 * Extension of case C. If we hit this, then the 1728 * random number generator returned the same vtag 1729 * when we first sent our INIT-ACK and when we later 1730 * sent our INIT. The side with the seq numbers that 1731 * are different will be the one that normnally 1732 * would have hit case C. This in effect "extends" 1733 * our vtags in this collision case to be 64 bits. 1734 * The same collision could occur aka you get both 1735 * vtag and seq number the same twice in a row.. but 1736 * is much less likely. If it did happen then we 1737 * would proceed through and bring up the assoc.. we 1738 * may end up with the wrong stream setup however.. 1739 * which would be bad.. but there is no way to 1740 * tell.. until we send on a stream that does not 1741 * exist :-) 1742 */ 1743 if (how_indx < sizeof(asoc->cookie_how)) 1744 asoc->cookie_how[how_indx] = 7; 1745 1746 return (NULL); 1747 } 1748 if (how_indx < sizeof(asoc->cookie_how)) 1749 asoc->cookie_how[how_indx] = 8; 1750 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_14); 1751 sctp_stop_all_cookie_timers(stcb); 1752 /* 1753 * since we did not send a HB make sure we don't double 1754 * things 1755 */ 1756 net->hb_responded = 1; 1757 if (stcb->asoc.sctp_autoclose_ticks && 1758 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 1759 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, 1760 NULL); 1761 } 1762 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1763 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 1764 1765 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) { 1766 /* 1767 * Ok the peer probably discarded our data (if we 1768 * echoed a cookie+data). So anything on the 1769 * sent_queue should be marked for retransmit, we 1770 * may not get something to kick us so it COULD 1771 * still take a timeout to move these.. but it can't 1772 * hurt to mark them. 1773 */ 1774 struct sctp_tmit_chunk *chk; 1775 1776 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 1777 if (chk->sent < SCTP_DATAGRAM_RESEND) { 1778 chk->sent = SCTP_DATAGRAM_RESEND; 1779 sctp_flight_size_decrease(chk); 1780 sctp_total_flight_decrease(stcb, chk); 1781 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 1782 spec_flag++; 1783 } 1784 } 1785 1786 } 1787 /* process the INIT info (peer's info) */ 1788 retval = sctp_process_init(init_cp, stcb); 1789 if (retval < 0) { 1790 if (how_indx < sizeof(asoc->cookie_how)) 1791 asoc->cookie_how[how_indx] = 9; 1792 return (NULL); 1793 } 1794 if (sctp_load_addresses_from_init(stcb, m, 1795 init_offset + sizeof(struct sctp_init_chunk), 1796 initack_offset, src, dst, init_src)) { 1797 if (how_indx < sizeof(asoc->cookie_how)) 1798 asoc->cookie_how[how_indx] = 10; 1799 return (NULL); 1800 } 1801 if ((asoc->state & SCTP_STATE_COOKIE_WAIT) || 1802 (asoc->state & SCTP_STATE_COOKIE_ECHOED)) { 1803 *notification = SCTP_NOTIFY_ASSOC_UP; 1804 1805 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1806 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1807 (inp->sctp_socket->so_qlimit == 0)) { 1808#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1809 struct socket *so; 1810 1811#endif 1812 stcb->sctp_ep->sctp_flags |= 1813 SCTP_PCB_FLAGS_CONNECTED; 1814#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1815 so = SCTP_INP_SO(stcb->sctp_ep); 1816 atomic_add_int(&stcb->asoc.refcnt, 1); 1817 SCTP_TCB_UNLOCK(stcb); 1818 SCTP_SOCKET_LOCK(so, 1); 1819 SCTP_TCB_LOCK(stcb); 1820 atomic_add_int(&stcb->asoc.refcnt, -1); 1821 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1822 SCTP_SOCKET_UNLOCK(so, 1); 1823 return (NULL); 1824 } 1825#endif 1826 soisconnected(stcb->sctp_socket); 1827#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1828 SCTP_SOCKET_UNLOCK(so, 1); 1829#endif 1830 } 1831 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) 1832 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1833 else 1834 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1835 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1836 } else if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) { 1837 SCTP_STAT_INCR_COUNTER32(sctps_restartestab); 1838 } else { 1839 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1840 } 1841 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1842 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1843 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1844 stcb->sctp_ep, stcb, asoc->primary_destination); 1845 } 1846 sctp_stop_all_cookie_timers(stcb); 1847 sctp_toss_old_cookies(stcb, asoc); 1848 sctp_send_cookie_ack(stcb); 1849 if (spec_flag) { 1850 /* 1851 * only if we have retrans set do we do this. What 1852 * this call does is get only the COOKIE-ACK out and 1853 * then when we return the normal call to 1854 * sctp_chunk_output will get the retrans out behind 1855 * this. 1856 */ 1857 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED); 1858 } 1859 if (how_indx < sizeof(asoc->cookie_how)) 1860 asoc->cookie_how[how_indx] = 11; 1861 1862 return (stcb); 1863 } 1864 if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1865 ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) && 1866 cookie->tie_tag_my_vtag == asoc->my_vtag_nonce && 1867 cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce && 1868 cookie->tie_tag_peer_vtag != 0) { 1869 struct sctpasochead *head; 1870 1871 if (asoc->peer_supports_nat) { 1872 /* 1873 * This is a gross gross hack. just call the 1874 * cookie_new code since we are allowing a duplicate 1875 * association. I hope this works... 1876 */ 1877 return (sctp_process_cookie_new(m, iphlen, offset, src, dst, 1878 sh, cookie, cookie_len, 1879 inp, netp, init_src, notification, 1880 auth_skipped, auth_offset, auth_len, 1881 use_mflowid, mflowid, 1882 vrf_id, port)); 1883 } 1884 /* 1885 * case A in Section 5.2.4 Table 2: XXMM (peer restarted) 1886 */ 1887 /* temp code */ 1888 if (how_indx < sizeof(asoc->cookie_how)) 1889 asoc->cookie_how[how_indx] = 12; 1890 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_15); 1891 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 1892 1893 /* notify upper layer */ 1894 *notification = SCTP_NOTIFY_ASSOC_RESTART; 1895 atomic_add_int(&stcb->asoc.refcnt, 1); 1896 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_OPEN) && 1897 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) && 1898 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) { 1899 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1900 } 1901 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) { 1902 SCTP_STAT_INCR_GAUGE32(sctps_restartestab); 1903 } else if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) { 1904 SCTP_STAT_INCR_GAUGE32(sctps_collisionestab); 1905 } 1906 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1907 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1908 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1909 stcb->sctp_ep, stcb, asoc->primary_destination); 1910 1911 } else if (!(asoc->state & SCTP_STATE_SHUTDOWN_SENT)) { 1912 /* move to OPEN state, if not in SHUTDOWN_SENT */ 1913 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1914 } 1915 asoc->pre_open_streams = 1916 ntohs(initack_cp->init.num_outbound_streams); 1917 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 1918 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 1919 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 1920 1921 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 1922 1923 asoc->str_reset_seq_in = asoc->init_seq_number; 1924 1925 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 1926 if (asoc->mapping_array) { 1927 memset(asoc->mapping_array, 0, 1928 asoc->mapping_array_size); 1929 } 1930 if (asoc->nr_mapping_array) { 1931 memset(asoc->nr_mapping_array, 0, 1932 asoc->mapping_array_size); 1933 } 1934 SCTP_TCB_UNLOCK(stcb); 1935 SCTP_INP_INFO_WLOCK(); 1936 SCTP_INP_WLOCK(stcb->sctp_ep); 1937 SCTP_TCB_LOCK(stcb); 1938 atomic_add_int(&stcb->asoc.refcnt, -1); 1939 /* send up all the data */ 1940 SCTP_TCB_SEND_LOCK(stcb); 1941 1942 sctp_report_all_outbound(stcb, 0, 1, SCTP_SO_NOT_LOCKED); 1943 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 1944 stcb->asoc.strmout[i].stream_no = i; 1945 stcb->asoc.strmout[i].next_sequence_sent = 0; 1946 stcb->asoc.strmout[i].last_msg_incomplete = 0; 1947 } 1948 /* process the INIT-ACK info (my info) */ 1949 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 1950 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1951 1952 /* pull from vtag hash */ 1953 LIST_REMOVE(stcb, sctp_asocs); 1954 /* re-insert to new vtag position */ 1955 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, 1956 SCTP_BASE_INFO(hashasocmark))]; 1957 /* 1958 * put it in the bucket in the vtag hash of assoc's for the 1959 * system 1960 */ 1961 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 1962 1963 /* process the INIT info (peer's info) */ 1964 SCTP_TCB_SEND_UNLOCK(stcb); 1965 SCTP_INP_WUNLOCK(stcb->sctp_ep); 1966 SCTP_INP_INFO_WUNLOCK(); 1967 1968 retval = sctp_process_init(init_cp, stcb); 1969 if (retval < 0) { 1970 if (how_indx < sizeof(asoc->cookie_how)) 1971 asoc->cookie_how[how_indx] = 13; 1972 1973 return (NULL); 1974 } 1975 /* 1976 * since we did not send a HB make sure we don't double 1977 * things 1978 */ 1979 net->hb_responded = 1; 1980 1981 if (sctp_load_addresses_from_init(stcb, m, 1982 init_offset + sizeof(struct sctp_init_chunk), 1983 initack_offset, src, dst, init_src)) { 1984 if (how_indx < sizeof(asoc->cookie_how)) 1985 asoc->cookie_how[how_indx] = 14; 1986 1987 return (NULL); 1988 } 1989 /* respond with a COOKIE-ACK */ 1990 sctp_stop_all_cookie_timers(stcb); 1991 sctp_toss_old_cookies(stcb, asoc); 1992 sctp_send_cookie_ack(stcb); 1993 if (how_indx < sizeof(asoc->cookie_how)) 1994 asoc->cookie_how[how_indx] = 15; 1995 1996 return (stcb); 1997 } 1998 if (how_indx < sizeof(asoc->cookie_how)) 1999 asoc->cookie_how[how_indx] = 16; 2000 /* all other cases... */ 2001 return (NULL); 2002} 2003 2004 2005/* 2006 * handle a state cookie for a new association m: input packet mbuf chain-- 2007 * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf 2008 * and the cookie signature does not exist offset: offset into mbuf to the 2009 * cookie-echo chunk length: length of the cookie chunk to: where the init 2010 * was from returns a new TCB 2011 */ 2012static struct sctp_tcb * 2013sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 2014 struct sockaddr *src, struct sockaddr *dst, 2015 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 2016 struct sctp_inpcb *inp, struct sctp_nets **netp, 2017 struct sockaddr *init_src, int *notification, 2018 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2019 uint8_t use_mflowid, uint32_t mflowid, 2020 uint32_t vrf_id, uint16_t port) 2021{ 2022 struct sctp_tcb *stcb; 2023 struct sctp_init_chunk *init_cp, init_buf; 2024 struct sctp_init_ack_chunk *initack_cp, initack_buf; 2025 struct sockaddr_storage sa_store; 2026 struct sockaddr *initack_src = (struct sockaddr *)&sa_store; 2027 struct sctp_association *asoc; 2028 int init_offset, initack_offset, initack_limit; 2029 int retval; 2030 int error = 0; 2031 uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE]; 2032 2033#ifdef INET 2034 struct sockaddr_in *sin; 2035 2036#endif 2037#ifdef INET6 2038 struct sockaddr_in6 *sin6; 2039 2040#endif 2041#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2042 struct socket *so; 2043 2044 so = SCTP_INP_SO(inp); 2045#endif 2046 2047 /* 2048 * find and validate the INIT chunk in the cookie (peer's info) the 2049 * INIT should start after the cookie-echo header struct (chunk 2050 * header, state cookie header struct) 2051 */ 2052 init_offset = offset + sizeof(struct sctp_cookie_echo_chunk); 2053 init_cp = (struct sctp_init_chunk *) 2054 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 2055 (uint8_t *) & init_buf); 2056 if (init_cp == NULL) { 2057 /* could not pull a INIT chunk in cookie */ 2058 SCTPDBG(SCTP_DEBUG_INPUT1, 2059 "process_cookie_new: could not pull INIT chunk hdr\n"); 2060 return (NULL); 2061 } 2062 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 2063 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n"); 2064 return (NULL); 2065 } 2066 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 2067 /* 2068 * find and validate the INIT-ACK chunk in the cookie (my info) the 2069 * INIT-ACK follows the INIT chunk 2070 */ 2071 initack_cp = (struct sctp_init_ack_chunk *) 2072 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 2073 (uint8_t *) & initack_buf); 2074 if (initack_cp == NULL) { 2075 /* could not pull INIT-ACK chunk in cookie */ 2076 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n"); 2077 return (NULL); 2078 } 2079 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 2080 return (NULL); 2081 } 2082 /* 2083 * NOTE: We can't use the INIT_ACK's chk_length to determine the 2084 * "initack_limit" value. This is because the chk_length field 2085 * includes the length of the cookie, but the cookie is omitted when 2086 * the INIT and INIT_ACK are tacked onto the cookie... 2087 */ 2088 initack_limit = offset + cookie_len; 2089 2090 /* 2091 * now that we know the INIT/INIT-ACK are in place, create a new TCB 2092 * and popluate 2093 */ 2094 2095 /* 2096 * Here we do a trick, we set in NULL for the proc/thread argument. 2097 * We do this since in effect we only use the p argument when the 2098 * socket is unbound and we must do an implicit bind. Since we are 2099 * getting a cookie, we cannot be unbound. 2100 */ 2101 stcb = sctp_aloc_assoc(inp, init_src, &error, 2102 ntohl(initack_cp->init.initiate_tag), vrf_id, 2103 (struct thread *)NULL 2104 ); 2105 if (stcb == NULL) { 2106 struct mbuf *op_err; 2107 2108 /* memory problem? */ 2109 SCTPDBG(SCTP_DEBUG_INPUT1, 2110 "process_cookie_new: no room for another TCB!\n"); 2111 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC); 2112 2113 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2114 src, dst, sh, op_err, 2115 use_mflowid, mflowid, 2116 vrf_id, port); 2117 return (NULL); 2118 } 2119 /* get the correct sctp_nets */ 2120 if (netp) 2121 *netp = sctp_findnet(stcb, init_src); 2122 2123 asoc = &stcb->asoc; 2124 /* get scope variables out of cookie */ 2125 asoc->ipv4_local_scope = cookie->ipv4_scope; 2126 asoc->site_scope = cookie->site_scope; 2127 asoc->local_scope = cookie->local_scope; 2128 asoc->loopback_scope = cookie->loopback_scope; 2129 2130 if ((asoc->ipv4_addr_legal != cookie->ipv4_addr_legal) || 2131 (asoc->ipv6_addr_legal != cookie->ipv6_addr_legal)) { 2132 struct mbuf *op_err; 2133 2134 /* 2135 * Houston we have a problem. The EP changed while the 2136 * cookie was in flight. Only recourse is to abort the 2137 * association. 2138 */ 2139 atomic_add_int(&stcb->asoc.refcnt, 1); 2140 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC); 2141 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2142 src, dst, sh, op_err, 2143 use_mflowid, mflowid, 2144 vrf_id, port); 2145#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2146 SCTP_TCB_UNLOCK(stcb); 2147 SCTP_SOCKET_LOCK(so, 1); 2148 SCTP_TCB_LOCK(stcb); 2149#endif 2150 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2151 SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 2152#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2153 SCTP_SOCKET_UNLOCK(so, 1); 2154#endif 2155 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2156 return (NULL); 2157 } 2158 /* process the INIT-ACK info (my info) */ 2159 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 2160 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 2161 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 2162 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 2163 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 2164 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 2165 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 2166 asoc->str_reset_seq_in = asoc->init_seq_number; 2167 2168 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 2169 2170 /* process the INIT info (peer's info) */ 2171 if (netp) 2172 retval = sctp_process_init(init_cp, stcb); 2173 else 2174 retval = 0; 2175 if (retval < 0) { 2176 atomic_add_int(&stcb->asoc.refcnt, 1); 2177#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2178 SCTP_TCB_UNLOCK(stcb); 2179 SCTP_SOCKET_LOCK(so, 1); 2180 SCTP_TCB_LOCK(stcb); 2181#endif 2182 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 2183#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2184 SCTP_SOCKET_UNLOCK(so, 1); 2185#endif 2186 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2187 return (NULL); 2188 } 2189 /* load all addresses */ 2190 if (sctp_load_addresses_from_init(stcb, m, 2191 init_offset + sizeof(struct sctp_init_chunk), initack_offset, 2192 src, dst, init_src)) { 2193 atomic_add_int(&stcb->asoc.refcnt, 1); 2194#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2195 SCTP_TCB_UNLOCK(stcb); 2196 SCTP_SOCKET_LOCK(so, 1); 2197 SCTP_TCB_LOCK(stcb); 2198#endif 2199 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_17); 2200#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2201 SCTP_SOCKET_UNLOCK(so, 1); 2202#endif 2203 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2204 return (NULL); 2205 } 2206 /* 2207 * verify any preceding AUTH chunk that was skipped 2208 */ 2209 /* pull the local authentication parameters from the cookie/init-ack */ 2210 sctp_auth_get_cookie_params(stcb, m, 2211 initack_offset + sizeof(struct sctp_init_ack_chunk), 2212 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk))); 2213 if (auth_skipped) { 2214 struct sctp_auth_chunk *auth; 2215 2216 auth = (struct sctp_auth_chunk *) 2217 sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf); 2218 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) { 2219 /* auth HMAC failed, dump the assoc and packet */ 2220 SCTPDBG(SCTP_DEBUG_AUTH1, 2221 "COOKIE-ECHO: AUTH failed\n"); 2222 atomic_add_int(&stcb->asoc.refcnt, 1); 2223#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2224 SCTP_TCB_UNLOCK(stcb); 2225 SCTP_SOCKET_LOCK(so, 1); 2226 SCTP_TCB_LOCK(stcb); 2227#endif 2228 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_18); 2229#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2230 SCTP_SOCKET_UNLOCK(so, 1); 2231#endif 2232 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2233 return (NULL); 2234 } else { 2235 /* remaining chunks checked... good to go */ 2236 stcb->asoc.authenticated = 1; 2237 } 2238 } 2239 /* update current state */ 2240 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2241 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 2242 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2243 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2244 stcb->sctp_ep, stcb, asoc->primary_destination); 2245 } 2246 sctp_stop_all_cookie_timers(stcb); 2247 SCTP_STAT_INCR_COUNTER32(sctps_passiveestab); 2248 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2249 2250 /* 2251 * if we're doing ASCONFs, check to see if we have any new local 2252 * addresses that need to get added to the peer (eg. addresses 2253 * changed while cookie echo in flight). This needs to be done 2254 * after we go to the OPEN state to do the correct asconf 2255 * processing. else, make sure we have the correct addresses in our 2256 * lists 2257 */ 2258 2259 /* warning, we re-use sin, sin6, sa_store here! */ 2260 /* pull in local_address (our "from" address) */ 2261 switch (cookie->laddr_type) { 2262#ifdef INET 2263 case SCTP_IPV4_ADDRESS: 2264 /* source addr is IPv4 */ 2265 sin = (struct sockaddr_in *)initack_src; 2266 memset(sin, 0, sizeof(*sin)); 2267 sin->sin_family = AF_INET; 2268 sin->sin_len = sizeof(struct sockaddr_in); 2269 sin->sin_addr.s_addr = cookie->laddress[0]; 2270 break; 2271#endif 2272#ifdef INET6 2273 case SCTP_IPV6_ADDRESS: 2274 /* source addr is IPv6 */ 2275 sin6 = (struct sockaddr_in6 *)initack_src; 2276 memset(sin6, 0, sizeof(*sin6)); 2277 sin6->sin6_family = AF_INET6; 2278 sin6->sin6_len = sizeof(struct sockaddr_in6); 2279 sin6->sin6_scope_id = cookie->scope_id; 2280 memcpy(&sin6->sin6_addr, cookie->laddress, 2281 sizeof(sin6->sin6_addr)); 2282 break; 2283#endif 2284 default: 2285 atomic_add_int(&stcb->asoc.refcnt, 1); 2286#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2287 SCTP_TCB_UNLOCK(stcb); 2288 SCTP_SOCKET_LOCK(so, 1); 2289 SCTP_TCB_LOCK(stcb); 2290#endif 2291 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_19); 2292#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2293 SCTP_SOCKET_UNLOCK(so, 1); 2294#endif 2295 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2296 return (NULL); 2297 } 2298 2299 /* set up to notify upper layer */ 2300 *notification = SCTP_NOTIFY_ASSOC_UP; 2301 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2302 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 2303 (inp->sctp_socket->so_qlimit == 0)) { 2304 /* 2305 * This is an endpoint that called connect() how it got a 2306 * cookie that is NEW is a bit of a mystery. It must be that 2307 * the INIT was sent, but before it got there.. a complete 2308 * INIT/INIT-ACK/COOKIE arrived. But of course then it 2309 * should have went to the other code.. not here.. oh well.. 2310 * a bit of protection is worth having.. 2311 */ 2312 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2313#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2314 atomic_add_int(&stcb->asoc.refcnt, 1); 2315 SCTP_TCB_UNLOCK(stcb); 2316 SCTP_SOCKET_LOCK(so, 1); 2317 SCTP_TCB_LOCK(stcb); 2318 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2319 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2320 SCTP_SOCKET_UNLOCK(so, 1); 2321 return (NULL); 2322 } 2323#endif 2324 soisconnected(stcb->sctp_socket); 2325#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2326 SCTP_SOCKET_UNLOCK(so, 1); 2327#endif 2328 } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 2329 (inp->sctp_socket->so_qlimit)) { 2330 /* 2331 * We don't want to do anything with this one. Since it is 2332 * the listening guy. The timer will get started for 2333 * accepted connections in the caller. 2334 */ 2335 ; 2336 } 2337 /* since we did not send a HB make sure we don't double things */ 2338 if ((netp) && (*netp)) 2339 (*netp)->hb_responded = 1; 2340 2341 if (stcb->asoc.sctp_autoclose_ticks && 2342 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2343 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL); 2344 } 2345 /* calculate the RTT */ 2346 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 2347 if ((netp) && (*netp)) { 2348 (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp, 2349 &cookie->time_entered, sctp_align_unsafe_makecopy, 2350 SCTP_RTT_FROM_NON_DATA); 2351 } 2352 /* respond with a COOKIE-ACK */ 2353 sctp_send_cookie_ack(stcb); 2354 2355 /* 2356 * check the address lists for any ASCONFs that need to be sent 2357 * AFTER the cookie-ack is sent 2358 */ 2359 sctp_check_address_list(stcb, m, 2360 initack_offset + sizeof(struct sctp_init_ack_chunk), 2361 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)), 2362 initack_src, cookie->local_scope, cookie->site_scope, 2363 cookie->ipv4_scope, cookie->loopback_scope); 2364 2365 2366 return (stcb); 2367} 2368 2369/* 2370 * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e 2371 * we NEED to make sure we are not already using the vtag. If so we 2372 * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit! 2373 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag, 2374 SCTP_BASE_INFO(hashasocmark))]; 2375 LIST_FOREACH(stcb, head, sctp_asocs) { 2376 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep)) { 2377 -- SEND ABORT - TRY AGAIN -- 2378 } 2379 } 2380*/ 2381 2382/* 2383 * handles a COOKIE-ECHO message stcb: modified to either a new or left as 2384 * existing (non-NULL) TCB 2385 */ 2386static struct mbuf * 2387sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset, 2388 struct sockaddr *src, struct sockaddr *dst, 2389 struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp, 2390 struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp, 2391 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2392 struct sctp_tcb **locked_tcb, 2393 uint8_t use_mflowid, uint32_t mflowid, 2394 uint32_t vrf_id, uint16_t port) 2395{ 2396 struct sctp_state_cookie *cookie; 2397 struct sctp_tcb *l_stcb = *stcb; 2398 struct sctp_inpcb *l_inp; 2399 struct sockaddr *to; 2400 struct sctp_pcb *ep; 2401 struct mbuf *m_sig; 2402 uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE]; 2403 uint8_t *sig; 2404 uint8_t cookie_ok = 0; 2405 unsigned int sig_offset, cookie_offset; 2406 unsigned int cookie_len; 2407 struct timeval now; 2408 struct timeval time_expires; 2409 int notification = 0; 2410 struct sctp_nets *netl; 2411 int had_a_existing_tcb = 0; 2412 int send_int_conf = 0; 2413 2414#ifdef INET 2415 struct sockaddr_in sin; 2416 2417#endif 2418#ifdef INET6 2419 struct sockaddr_in6 sin6; 2420 2421#endif 2422 2423 SCTPDBG(SCTP_DEBUG_INPUT2, 2424 "sctp_handle_cookie: handling COOKIE-ECHO\n"); 2425 2426 if (inp_p == NULL) { 2427 return (NULL); 2428 } 2429 cookie = &cp->cookie; 2430 cookie_offset = offset + sizeof(struct sctp_chunkhdr); 2431 cookie_len = ntohs(cp->ch.chunk_length); 2432 2433 if ((cookie->peerport != sh->src_port) && 2434 (cookie->myport != sh->dest_port) && 2435 (cookie->my_vtag != sh->v_tag)) { 2436 /* 2437 * invalid ports or bad tag. Note that we always leave the 2438 * v_tag in the header in network order and when we stored 2439 * it in the my_vtag slot we also left it in network order. 2440 * This maintains the match even though it may be in the 2441 * opposite byte order of the machine :-> 2442 */ 2443 return (NULL); 2444 } 2445 if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) + 2446 sizeof(struct sctp_init_chunk) + 2447 sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) { 2448 /* cookie too small */ 2449 return (NULL); 2450 } 2451 /* 2452 * split off the signature into its own mbuf (since it should not be 2453 * calculated in the sctp_hmac_m() call). 2454 */ 2455 sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE; 2456 m_sig = m_split(m, sig_offset, M_DONTWAIT); 2457 if (m_sig == NULL) { 2458 /* out of memory or ?? */ 2459 return (NULL); 2460 } 2461#ifdef SCTP_MBUF_LOGGING 2462 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 2463 struct mbuf *mat; 2464 2465 for (mat = m_sig; mat; mat = SCTP_BUF_NEXT(mat)) { 2466 if (SCTP_BUF_IS_EXTENDED(mat)) { 2467 sctp_log_mb(mat, SCTP_MBUF_SPLIT); 2468 } 2469 } 2470 } 2471#endif 2472 2473 /* 2474 * compute the signature/digest for the cookie 2475 */ 2476 ep = &(*inp_p)->sctp_ep; 2477 l_inp = *inp_p; 2478 if (l_stcb) { 2479 SCTP_TCB_UNLOCK(l_stcb); 2480 } 2481 SCTP_INP_RLOCK(l_inp); 2482 if (l_stcb) { 2483 SCTP_TCB_LOCK(l_stcb); 2484 } 2485 /* which cookie is it? */ 2486 if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) && 2487 (ep->current_secret_number != ep->last_secret_number)) { 2488 /* it's the old cookie */ 2489 (void)sctp_hmac_m(SCTP_HMAC, 2490 (uint8_t *) ep->secret_key[(int)ep->last_secret_number], 2491 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2492 } else { 2493 /* it's the current cookie */ 2494 (void)sctp_hmac_m(SCTP_HMAC, 2495 (uint8_t *) ep->secret_key[(int)ep->current_secret_number], 2496 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2497 } 2498 /* get the signature */ 2499 SCTP_INP_RUNLOCK(l_inp); 2500 sig = (uint8_t *) sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *) & tmp_sig); 2501 if (sig == NULL) { 2502 /* couldn't find signature */ 2503 sctp_m_freem(m_sig); 2504 return (NULL); 2505 } 2506 /* compare the received digest with the computed digest */ 2507 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) { 2508 /* try the old cookie? */ 2509 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) && 2510 (ep->current_secret_number != ep->last_secret_number)) { 2511 /* compute digest with old */ 2512 (void)sctp_hmac_m(SCTP_HMAC, 2513 (uint8_t *) ep->secret_key[(int)ep->last_secret_number], 2514 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2515 /* compare */ 2516 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0) 2517 cookie_ok = 1; 2518 } 2519 } else { 2520 cookie_ok = 1; 2521 } 2522 2523 /* 2524 * Now before we continue we must reconstruct our mbuf so that 2525 * normal processing of any other chunks will work. 2526 */ 2527 { 2528 struct mbuf *m_at; 2529 2530 m_at = m; 2531 while (SCTP_BUF_NEXT(m_at) != NULL) { 2532 m_at = SCTP_BUF_NEXT(m_at); 2533 } 2534 SCTP_BUF_NEXT(m_at) = m_sig; 2535 } 2536 2537 if (cookie_ok == 0) { 2538 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n"); 2539 SCTPDBG(SCTP_DEBUG_INPUT2, 2540 "offset = %u, cookie_offset = %u, sig_offset = %u\n", 2541 (uint32_t) offset, cookie_offset, sig_offset); 2542 return (NULL); 2543 } 2544 /* 2545 * check the cookie timestamps to be sure it's not stale 2546 */ 2547 (void)SCTP_GETTIME_TIMEVAL(&now); 2548 /* Expire time is in Ticks, so we convert to seconds */ 2549 time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life); 2550 time_expires.tv_usec = cookie->time_entered.tv_usec; 2551 /* 2552 * TODO sctp_constants.h needs alternative time macros when _KERNEL 2553 * is undefined. 2554 */ 2555 if (timevalcmp(&now, &time_expires, >)) { 2556 /* cookie is stale! */ 2557 struct mbuf *op_err; 2558 struct sctp_stale_cookie_msg *scm; 2559 uint32_t tim; 2560 2561 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_stale_cookie_msg), 2562 0, M_DONTWAIT, 1, MT_DATA); 2563 if (op_err == NULL) { 2564 /* FOOBAR */ 2565 return (NULL); 2566 } 2567 /* Set the len */ 2568 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_stale_cookie_msg); 2569 scm = mtod(op_err, struct sctp_stale_cookie_msg *); 2570 scm->ph.param_type = htons(SCTP_CAUSE_STALE_COOKIE); 2571 scm->ph.param_length = htons((sizeof(struct sctp_paramhdr) + 2572 (sizeof(uint32_t)))); 2573 /* seconds to usec */ 2574 tim = (now.tv_sec - time_expires.tv_sec) * 1000000; 2575 /* add in usec */ 2576 if (tim == 0) 2577 tim = now.tv_usec - cookie->time_entered.tv_usec; 2578 scm->time_usec = htonl(tim); 2579 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 2580 use_mflowid, mflowid, 2581 vrf_id, port); 2582 return (NULL); 2583 } 2584 /* 2585 * Now we must see with the lookup address if we have an existing 2586 * asoc. This will only happen if we were in the COOKIE-WAIT state 2587 * and a INIT collided with us and somewhere the peer sent the 2588 * cookie on another address besides the single address our assoc 2589 * had for him. In this case we will have one of the tie-tags set at 2590 * least AND the address field in the cookie can be used to look it 2591 * up. 2592 */ 2593 to = NULL; 2594 switch (cookie->addr_type) { 2595#ifdef INET6 2596 case SCTP_IPV6_ADDRESS: 2597 memset(&sin6, 0, sizeof(sin6)); 2598 sin6.sin6_family = AF_INET6; 2599 sin6.sin6_len = sizeof(sin6); 2600 sin6.sin6_port = sh->src_port; 2601 sin6.sin6_scope_id = cookie->scope_id; 2602 memcpy(&sin6.sin6_addr.s6_addr, cookie->address, 2603 sizeof(sin6.sin6_addr.s6_addr)); 2604 to = (struct sockaddr *)&sin6; 2605 break; 2606#endif 2607#ifdef INET 2608 case SCTP_IPV4_ADDRESS: 2609 memset(&sin, 0, sizeof(sin)); 2610 sin.sin_family = AF_INET; 2611 sin.sin_len = sizeof(sin); 2612 sin.sin_port = sh->src_port; 2613 sin.sin_addr.s_addr = cookie->address[0]; 2614 to = (struct sockaddr *)&sin; 2615 break; 2616#endif 2617 default: 2618 /* This should not happen */ 2619 return (NULL); 2620 } 2621 if ((*stcb == NULL) && to) { 2622 /* Yep, lets check */ 2623 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL); 2624 if (*stcb == NULL) { 2625 /* 2626 * We should have only got back the same inp. If we 2627 * got back a different ep we have a problem. The 2628 * original findep got back l_inp and now 2629 */ 2630 if (l_inp != *inp_p) { 2631 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n"); 2632 } 2633 } else { 2634 if (*locked_tcb == NULL) { 2635 /* 2636 * In this case we found the assoc only 2637 * after we locked the create lock. This 2638 * means we are in a colliding case and we 2639 * must make sure that we unlock the tcb if 2640 * its one of the cases where we throw away 2641 * the incoming packets. 2642 */ 2643 *locked_tcb = *stcb; 2644 2645 /* 2646 * We must also increment the inp ref count 2647 * since the ref_count flags was set when we 2648 * did not find the TCB, now we found it 2649 * which reduces the refcount.. we must 2650 * raise it back out to balance it all :-) 2651 */ 2652 SCTP_INP_INCR_REF((*stcb)->sctp_ep); 2653 if ((*stcb)->sctp_ep != l_inp) { 2654 SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n", 2655 (*stcb)->sctp_ep, l_inp); 2656 } 2657 } 2658 } 2659 } 2660 if (to == NULL) { 2661 return (NULL); 2662 } 2663 cookie_len -= SCTP_SIGNATURE_SIZE; 2664 if (*stcb == NULL) { 2665 /* this is the "normal" case... get a new TCB */ 2666 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh, 2667 cookie, cookie_len, *inp_p, 2668 netp, to, ¬ification, 2669 auth_skipped, auth_offset, auth_len, 2670 use_mflowid, mflowid, 2671 vrf_id, port); 2672 } else { 2673 /* this is abnormal... cookie-echo on existing TCB */ 2674 had_a_existing_tcb = 1; 2675 *stcb = sctp_process_cookie_existing(m, iphlen, offset, 2676 src, dst, sh, 2677 cookie, cookie_len, *inp_p, *stcb, netp, to, 2678 ¬ification, auth_skipped, auth_offset, auth_len, 2679 use_mflowid, mflowid, 2680 vrf_id, port); 2681 } 2682 2683 if (*stcb == NULL) { 2684 /* still no TCB... must be bad cookie-echo */ 2685 return (NULL); 2686 } 2687 if ((*netp != NULL) && (use_mflowid != 0)) { 2688 (*netp)->flowid = mflowid; 2689#ifdef INVARIANTS 2690 (*netp)->flowidset = 1; 2691#endif 2692 } 2693 /* 2694 * Ok, we built an association so confirm the address we sent the 2695 * INIT-ACK to. 2696 */ 2697 netl = sctp_findnet(*stcb, to); 2698 /* 2699 * This code should in theory NOT run but 2700 */ 2701 if (netl == NULL) { 2702 /* TSNH! Huh, why do I need to add this address here? */ 2703 if (sctp_add_remote_addr(*stcb, to, NULL, SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) { 2704 return (NULL); 2705 } 2706 netl = sctp_findnet(*stcb, to); 2707 } 2708 if (netl) { 2709 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) { 2710 netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 2711 (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL, 2712 netl); 2713 send_int_conf = 1; 2714 } 2715 } 2716 sctp_start_net_timers(*stcb); 2717 if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) { 2718 if (!had_a_existing_tcb || 2719 (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) { 2720 /* 2721 * If we have a NEW cookie or the connect never 2722 * reached the connected state during collision we 2723 * must do the TCP accept thing. 2724 */ 2725 struct socket *so, *oso; 2726 struct sctp_inpcb *inp; 2727 2728 if (notification == SCTP_NOTIFY_ASSOC_RESTART) { 2729 /* 2730 * For a restart we will keep the same 2731 * socket, no need to do anything. I THINK!! 2732 */ 2733 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2734 if (send_int_conf) { 2735 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2736 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2737 } 2738 return (m); 2739 } 2740 oso = (*inp_p)->sctp_socket; 2741 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2742 SCTP_TCB_UNLOCK((*stcb)); 2743 CURVNET_SET(oso->so_vnet); 2744 so = sonewconn(oso, 0 2745 ); 2746 CURVNET_RESTORE(); 2747 SCTP_TCB_LOCK((*stcb)); 2748 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2749 2750 if (so == NULL) { 2751 struct mbuf *op_err; 2752 2753#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2754 struct socket *pcb_so; 2755 2756#endif 2757 /* Too many sockets */ 2758 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n"); 2759 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC); 2760 sctp_abort_association(*inp_p, NULL, m, iphlen, 2761 src, dst, sh, op_err, 2762 use_mflowid, mflowid, 2763 vrf_id, port); 2764#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2765 pcb_so = SCTP_INP_SO(*inp_p); 2766 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2767 SCTP_TCB_UNLOCK((*stcb)); 2768 SCTP_SOCKET_LOCK(pcb_so, 1); 2769 SCTP_TCB_LOCK((*stcb)); 2770 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2771#endif 2772 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_20); 2773#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2774 SCTP_SOCKET_UNLOCK(pcb_so, 1); 2775#endif 2776 return (NULL); 2777 } 2778 inp = (struct sctp_inpcb *)so->so_pcb; 2779 SCTP_INP_INCR_REF(inp); 2780 /* 2781 * We add the unbound flag here so that if we get an 2782 * soabort() before we get the move_pcb done, we 2783 * will properly cleanup. 2784 */ 2785 inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE | 2786 SCTP_PCB_FLAGS_CONNECTED | 2787 SCTP_PCB_FLAGS_IN_TCPPOOL | 2788 SCTP_PCB_FLAGS_UNBOUND | 2789 (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) | 2790 SCTP_PCB_FLAGS_DONT_WAKE); 2791 inp->sctp_features = (*inp_p)->sctp_features; 2792 inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features; 2793 inp->sctp_socket = so; 2794 inp->sctp_frag_point = (*inp_p)->sctp_frag_point; 2795 inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off; 2796 inp->sctp_ecn_enable = (*inp_p)->sctp_ecn_enable; 2797 inp->partial_delivery_point = (*inp_p)->partial_delivery_point; 2798 inp->sctp_context = (*inp_p)->sctp_context; 2799 inp->local_strreset_support = (*inp_p)->local_strreset_support; 2800 inp->inp_starting_point_for_iterator = NULL; 2801 /* 2802 * copy in the authentication parameters from the 2803 * original endpoint 2804 */ 2805 if (inp->sctp_ep.local_hmacs) 2806 sctp_free_hmaclist(inp->sctp_ep.local_hmacs); 2807 inp->sctp_ep.local_hmacs = 2808 sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs); 2809 if (inp->sctp_ep.local_auth_chunks) 2810 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks); 2811 inp->sctp_ep.local_auth_chunks = 2812 sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks); 2813 2814 /* 2815 * Now we must move it from one hash table to 2816 * another and get the tcb in the right place. 2817 */ 2818 2819 /* 2820 * This is where the one-2-one socket is put into 2821 * the accept state waiting for the accept! 2822 */ 2823 if (*stcb) { 2824 (*stcb)->asoc.state |= SCTP_STATE_IN_ACCEPT_QUEUE; 2825 } 2826 sctp_move_pcb_and_assoc(*inp_p, inp, *stcb); 2827 2828 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2829 SCTP_TCB_UNLOCK((*stcb)); 2830 2831 sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb, 2832 0); 2833 SCTP_TCB_LOCK((*stcb)); 2834 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2835 2836 2837 /* 2838 * now we must check to see if we were aborted while 2839 * the move was going on and the lock/unlock 2840 * happened. 2841 */ 2842 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 2843 /* 2844 * yep it was, we leave the assoc attached 2845 * to the socket since the sctp_inpcb_free() 2846 * call will send an abort for us. 2847 */ 2848 SCTP_INP_DECR_REF(inp); 2849 return (NULL); 2850 } 2851 SCTP_INP_DECR_REF(inp); 2852 /* Switch over to the new guy */ 2853 *inp_p = inp; 2854 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2855 if (send_int_conf) { 2856 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2857 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2858 } 2859 /* 2860 * Pull it from the incomplete queue and wake the 2861 * guy 2862 */ 2863#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2864 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2865 SCTP_TCB_UNLOCK((*stcb)); 2866 SCTP_SOCKET_LOCK(so, 1); 2867#endif 2868 soisconnected(so); 2869#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2870 SCTP_TCB_LOCK((*stcb)); 2871 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2872 SCTP_SOCKET_UNLOCK(so, 1); 2873#endif 2874 return (m); 2875 } 2876 } 2877 if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE) { 2878 if (notification) { 2879 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2880 } 2881 if (send_int_conf) { 2882 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2883 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2884 } 2885 } 2886 return (m); 2887} 2888 2889static void 2890sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED, 2891 struct sctp_tcb *stcb, struct sctp_nets *net) 2892{ 2893 /* cp must not be used, others call this without a c-ack :-) */ 2894 struct sctp_association *asoc; 2895 2896 SCTPDBG(SCTP_DEBUG_INPUT2, 2897 "sctp_handle_cookie_ack: handling COOKIE-ACK\n"); 2898 if (stcb == NULL) 2899 return; 2900 2901 asoc = &stcb->asoc; 2902 2903 sctp_stop_all_cookie_timers(stcb); 2904 /* process according to association state */ 2905 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) { 2906 /* state change only needed when I am in right state */ 2907 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2908 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 2909 sctp_start_net_timers(stcb); 2910 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2911 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2912 stcb->sctp_ep, stcb, asoc->primary_destination); 2913 2914 } 2915 /* update RTO */ 2916 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 2917 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2918 if (asoc->overall_error_count == 0) { 2919 net->RTO = sctp_calculate_rto(stcb, asoc, net, 2920 &asoc->time_entered, sctp_align_safe_nocopy, 2921 SCTP_RTT_FROM_NON_DATA); 2922 } 2923 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 2924 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2925 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2926 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 2927#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2928 struct socket *so; 2929 2930#endif 2931 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2932#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2933 so = SCTP_INP_SO(stcb->sctp_ep); 2934 atomic_add_int(&stcb->asoc.refcnt, 1); 2935 SCTP_TCB_UNLOCK(stcb); 2936 SCTP_SOCKET_LOCK(so, 1); 2937 SCTP_TCB_LOCK(stcb); 2938 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2939#endif 2940 if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) { 2941 soisconnected(stcb->sctp_socket); 2942 } 2943#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2944 SCTP_SOCKET_UNLOCK(so, 1); 2945#endif 2946 } 2947 /* 2948 * since we did not send a HB make sure we don't double 2949 * things 2950 */ 2951 net->hb_responded = 1; 2952 2953 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2954 /* 2955 * We don't need to do the asconf thing, nor hb or 2956 * autoclose if the socket is closed. 2957 */ 2958 goto closed_socket; 2959 } 2960 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 2961 stcb, net); 2962 2963 2964 if (stcb->asoc.sctp_autoclose_ticks && 2965 sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2966 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 2967 stcb->sctp_ep, stcb, NULL); 2968 } 2969 /* 2970 * send ASCONF if parameters are pending and ASCONFs are 2971 * allowed (eg. addresses changed when init/cookie echo were 2972 * in flight) 2973 */ 2974 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) && 2975 (stcb->asoc.peer_supports_asconf) && 2976 (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) { 2977#ifdef SCTP_TIMER_BASED_ASCONF 2978 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, 2979 stcb->sctp_ep, stcb, 2980 stcb->asoc.primary_destination); 2981#else 2982 sctp_send_asconf(stcb, stcb->asoc.primary_destination, 2983 SCTP_ADDR_NOT_LOCKED); 2984#endif 2985 } 2986 } 2987closed_socket: 2988 /* Toss the cookie if I can */ 2989 sctp_toss_old_cookies(stcb, asoc); 2990 if (!TAILQ_EMPTY(&asoc->sent_queue)) { 2991 /* Restart the timer if we have pending data */ 2992 struct sctp_tmit_chunk *chk; 2993 2994 chk = TAILQ_FIRST(&asoc->sent_queue); 2995 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 2996 } 2997} 2998 2999static void 3000sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp, 3001 struct sctp_tcb *stcb) 3002{ 3003 struct sctp_nets *net; 3004 struct sctp_tmit_chunk *lchk; 3005 struct sctp_ecne_chunk bkup; 3006 uint8_t override_bit; 3007 uint32_t tsn, window_data_tsn; 3008 int len; 3009 unsigned int pkt_cnt; 3010 3011 len = ntohs(cp->ch.chunk_length); 3012 if ((len != sizeof(struct sctp_ecne_chunk)) && 3013 (len != sizeof(struct old_sctp_ecne_chunk))) { 3014 return; 3015 } 3016 if (len == sizeof(struct old_sctp_ecne_chunk)) { 3017 /* Its the old format */ 3018 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk)); 3019 bkup.num_pkts_since_cwr = htonl(1); 3020 cp = &bkup; 3021 } 3022 SCTP_STAT_INCR(sctps_recvecne); 3023 tsn = ntohl(cp->tsn); 3024 pkt_cnt = ntohl(cp->num_pkts_since_cwr); 3025 lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead); 3026 if (lchk == NULL) { 3027 window_data_tsn = stcb->asoc.sending_seq - 1; 3028 } else { 3029 window_data_tsn = lchk->rec.data.TSN_seq; 3030 } 3031 3032 /* Find where it was sent to if possible. */ 3033 net = NULL; 3034 TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) { 3035 if (lchk->rec.data.TSN_seq == tsn) { 3036 net = lchk->whoTo; 3037 net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send; 3038 break; 3039 } 3040 if (SCTP_TSN_GT(lchk->rec.data.TSN_seq, tsn)) { 3041 break; 3042 } 3043 } 3044 if (net == NULL) { 3045 /* 3046 * What to do. A previous send of a CWR was possibly lost. 3047 * See how old it is, we may have it marked on the actual 3048 * net. 3049 */ 3050 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 3051 if (tsn == net->last_cwr_tsn) { 3052 /* Found him, send it off */ 3053 break; 3054 } 3055 } 3056 if (net == NULL) { 3057 /* 3058 * If we reach here, we need to send a special CWR 3059 * that says hey, we did this a long time ago and 3060 * you lost the response. 3061 */ 3062 net = TAILQ_FIRST(&stcb->asoc.nets); 3063 if (net == NULL) { 3064 /* TSNH */ 3065 return; 3066 } 3067 override_bit = SCTP_CWR_REDUCE_OVERRIDE; 3068 } else { 3069 override_bit = 0; 3070 } 3071 } else { 3072 override_bit = 0; 3073 } 3074 if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) && 3075 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 3076 /* 3077 * JRS - Use the congestion control given in the pluggable 3078 * CC module 3079 */ 3080 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt); 3081 /* 3082 * We reduce once every RTT. So we will only lower cwnd at 3083 * the next sending seq i.e. the window_data_tsn 3084 */ 3085 net->cwr_window_tsn = window_data_tsn; 3086 net->ecn_ce_pkt_cnt += pkt_cnt; 3087 net->lost_cnt = pkt_cnt; 3088 net->last_cwr_tsn = tsn; 3089 } else { 3090 override_bit |= SCTP_CWR_IN_SAME_WINDOW; 3091 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) && 3092 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 3093 /* 3094 * Another loss in the same window update how many 3095 * marks/packets lost we have had. 3096 */ 3097 int cnt = 1; 3098 3099 if (pkt_cnt > net->lost_cnt) { 3100 /* Should be the case */ 3101 cnt = (pkt_cnt - net->lost_cnt); 3102 net->ecn_ce_pkt_cnt += cnt; 3103 } 3104 net->lost_cnt = pkt_cnt; 3105 net->last_cwr_tsn = tsn; 3106 /* 3107 * Most CC functions will ignore this call, since we 3108 * are in-window yet of the initial CE the peer saw. 3109 */ 3110 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt); 3111 } 3112 } 3113 /* 3114 * We always send a CWR this way if our previous one was lost our 3115 * peer will get an update, or if it is not time again to reduce we 3116 * still get the cwr to the peer. Note we set the override when we 3117 * could not find the TSN on the chunk or the destination network. 3118 */ 3119 sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit); 3120} 3121 3122static void 3123sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net) 3124{ 3125 /* 3126 * Here we get a CWR from the peer. We must look in the outqueue and 3127 * make sure that we have a covered ECNE in teh control chunk part. 3128 * If so remove it. 3129 */ 3130 struct sctp_tmit_chunk *chk; 3131 struct sctp_ecne_chunk *ecne; 3132 int override; 3133 uint32_t cwr_tsn; 3134 3135 cwr_tsn = ntohl(cp->tsn); 3136 3137 override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE; 3138 TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) { 3139 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) { 3140 continue; 3141 } 3142 if ((override == 0) && (chk->whoTo != net)) { 3143 /* Must be from the right src unless override is set */ 3144 continue; 3145 } 3146 ecne = mtod(chk->data, struct sctp_ecne_chunk *); 3147 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) { 3148 /* this covers this ECNE, we can remove it */ 3149 stcb->asoc.ecn_echo_cnt_onq--; 3150 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, 3151 sctp_next); 3152 if (chk->data) { 3153 sctp_m_freem(chk->data); 3154 chk->data = NULL; 3155 } 3156 stcb->asoc.ctrl_queue_cnt--; 3157 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3158 if (override == 0) { 3159 break; 3160 } 3161 } 3162 } 3163} 3164 3165static void 3166sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED, 3167 struct sctp_tcb *stcb, struct sctp_nets *net) 3168{ 3169 struct sctp_association *asoc; 3170 3171#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3172 struct socket *so; 3173 3174#endif 3175 3176 SCTPDBG(SCTP_DEBUG_INPUT2, 3177 "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n"); 3178 if (stcb == NULL) 3179 return; 3180 3181 asoc = &stcb->asoc; 3182 /* process according to association state */ 3183 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 3184 /* unexpected SHUTDOWN-COMPLETE... so ignore... */ 3185 SCTPDBG(SCTP_DEBUG_INPUT2, 3186 "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n"); 3187 SCTP_TCB_UNLOCK(stcb); 3188 return; 3189 } 3190 /* notify upper layer protocol */ 3191 if (stcb->sctp_socket) { 3192 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 3193 /* are the queues empty? they should be */ 3194 if (!TAILQ_EMPTY(&asoc->send_queue) || 3195 !TAILQ_EMPTY(&asoc->sent_queue) || 3196 !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 3197 sctp_report_all_outbound(stcb, 0, 0, SCTP_SO_NOT_LOCKED); 3198 } 3199 } 3200 /* stop the timer */ 3201 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_22); 3202 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 3203 /* free the TCB */ 3204 SCTPDBG(SCTP_DEBUG_INPUT2, 3205 "sctp_handle_shutdown_complete: calls free-asoc\n"); 3206#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3207 so = SCTP_INP_SO(stcb->sctp_ep); 3208 atomic_add_int(&stcb->asoc.refcnt, 1); 3209 SCTP_TCB_UNLOCK(stcb); 3210 SCTP_SOCKET_LOCK(so, 1); 3211 SCTP_TCB_LOCK(stcb); 3212 atomic_subtract_int(&stcb->asoc.refcnt, 1); 3213#endif 3214 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_23); 3215#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3216 SCTP_SOCKET_UNLOCK(so, 1); 3217#endif 3218 return; 3219} 3220 3221static int 3222process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc, 3223 struct sctp_nets *net, uint8_t flg) 3224{ 3225 switch (desc->chunk_type) { 3226 case SCTP_DATA: 3227 /* find the tsn to resend (possibly */ 3228 { 3229 uint32_t tsn; 3230 struct sctp_tmit_chunk *tp1; 3231 3232 tsn = ntohl(desc->tsn_ifany); 3233 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3234 if (tp1->rec.data.TSN_seq == tsn) { 3235 /* found it */ 3236 break; 3237 } 3238 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, tsn)) { 3239 /* not found */ 3240 tp1 = NULL; 3241 break; 3242 } 3243 } 3244 if (tp1 == NULL) { 3245 /* 3246 * Do it the other way , aka without paying 3247 * attention to queue seq order. 3248 */ 3249 SCTP_STAT_INCR(sctps_pdrpdnfnd); 3250 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3251 if (tp1->rec.data.TSN_seq == tsn) { 3252 /* found it */ 3253 break; 3254 } 3255 } 3256 } 3257 if (tp1 == NULL) { 3258 SCTP_STAT_INCR(sctps_pdrptsnnf); 3259 } 3260 if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) { 3261 uint8_t *ddp; 3262 3263 if (((flg & SCTP_BADCRC) == 0) && 3264 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3265 return (0); 3266 } 3267 if ((stcb->asoc.peers_rwnd == 0) && 3268 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3269 SCTP_STAT_INCR(sctps_pdrpdiwnp); 3270 return (0); 3271 } 3272 if (stcb->asoc.peers_rwnd == 0 && 3273 (flg & SCTP_FROM_MIDDLE_BOX)) { 3274 SCTP_STAT_INCR(sctps_pdrpdizrw); 3275 return (0); 3276 } 3277 ddp = (uint8_t *) (mtod(tp1->data, caddr_t)+ 3278 sizeof(struct sctp_data_chunk)); 3279 { 3280 unsigned int iii; 3281 3282 for (iii = 0; iii < sizeof(desc->data_bytes); 3283 iii++) { 3284 if (ddp[iii] != desc->data_bytes[iii]) { 3285 SCTP_STAT_INCR(sctps_pdrpbadd); 3286 return (-1); 3287 } 3288 } 3289 } 3290 3291 if (tp1->do_rtt) { 3292 /* 3293 * this guy had a RTO calculation 3294 * pending on it, cancel it 3295 */ 3296 if (tp1->whoTo->rto_needed == 0) { 3297 tp1->whoTo->rto_needed = 1; 3298 } 3299 tp1->do_rtt = 0; 3300 } 3301 SCTP_STAT_INCR(sctps_pdrpmark); 3302 if (tp1->sent != SCTP_DATAGRAM_RESEND) 3303 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3304 /* 3305 * mark it as if we were doing a FR, since 3306 * we will be getting gap ack reports behind 3307 * the info from the router. 3308 */ 3309 tp1->rec.data.doing_fast_retransmit = 1; 3310 /* 3311 * mark the tsn with what sequences can 3312 * cause a new FR. 3313 */ 3314 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) { 3315 tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq; 3316 } else { 3317 tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq; 3318 } 3319 3320 /* restart the timer */ 3321 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3322 stcb, tp1->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_24); 3323 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3324 stcb, tp1->whoTo); 3325 3326 /* fix counts and things */ 3327 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 3328 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP, 3329 tp1->whoTo->flight_size, 3330 tp1->book_size, 3331 (uintptr_t) stcb, 3332 tp1->rec.data.TSN_seq); 3333 } 3334 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3335 sctp_flight_size_decrease(tp1); 3336 sctp_total_flight_decrease(stcb, tp1); 3337 } 3338 tp1->sent = SCTP_DATAGRAM_RESEND; 3339 } { 3340 /* audit code */ 3341 unsigned int audit; 3342 3343 audit = 0; 3344 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3345 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3346 audit++; 3347 } 3348 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue, 3349 sctp_next) { 3350 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3351 audit++; 3352 } 3353 if (audit != stcb->asoc.sent_queue_retran_cnt) { 3354 SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n", 3355 audit, stcb->asoc.sent_queue_retran_cnt); 3356#ifndef SCTP_AUDITING_ENABLED 3357 stcb->asoc.sent_queue_retran_cnt = audit; 3358#endif 3359 } 3360 } 3361 } 3362 break; 3363 case SCTP_ASCONF: 3364 { 3365 struct sctp_tmit_chunk *asconf; 3366 3367 TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue, 3368 sctp_next) { 3369 if (asconf->rec.chunk_id.id == SCTP_ASCONF) { 3370 break; 3371 } 3372 } 3373 if (asconf) { 3374 if (asconf->sent != SCTP_DATAGRAM_RESEND) 3375 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3376 asconf->sent = SCTP_DATAGRAM_RESEND; 3377 asconf->snd_count--; 3378 } 3379 } 3380 break; 3381 case SCTP_INITIATION: 3382 /* resend the INIT */ 3383 stcb->asoc.dropped_special_cnt++; 3384 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) { 3385 /* 3386 * If we can get it in, in a few attempts we do 3387 * this, otherwise we let the timer fire. 3388 */ 3389 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, 3390 stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_25); 3391 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 3392 } 3393 break; 3394 case SCTP_SELECTIVE_ACK: 3395 case SCTP_NR_SELECTIVE_ACK: 3396 /* resend the sack */ 3397 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED); 3398 break; 3399 case SCTP_HEARTBEAT_REQUEST: 3400 /* resend a demand HB */ 3401 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) { 3402 /* 3403 * Only retransmit if we KNOW we wont destroy the 3404 * tcb 3405 */ 3406 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 3407 } 3408 break; 3409 case SCTP_SHUTDOWN: 3410 sctp_send_shutdown(stcb, net); 3411 break; 3412 case SCTP_SHUTDOWN_ACK: 3413 sctp_send_shutdown_ack(stcb, net); 3414 break; 3415 case SCTP_COOKIE_ECHO: 3416 { 3417 struct sctp_tmit_chunk *cookie; 3418 3419 cookie = NULL; 3420 TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, 3421 sctp_next) { 3422 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) { 3423 break; 3424 } 3425 } 3426 if (cookie) { 3427 if (cookie->sent != SCTP_DATAGRAM_RESEND) 3428 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3429 cookie->sent = SCTP_DATAGRAM_RESEND; 3430 sctp_stop_all_cookie_timers(stcb); 3431 } 3432 } 3433 break; 3434 case SCTP_COOKIE_ACK: 3435 sctp_send_cookie_ack(stcb); 3436 break; 3437 case SCTP_ASCONF_ACK: 3438 /* resend last asconf ack */ 3439 sctp_send_asconf_ack(stcb); 3440 break; 3441 case SCTP_FORWARD_CUM_TSN: 3442 send_forward_tsn(stcb, &stcb->asoc); 3443 break; 3444 /* can't do anything with these */ 3445 case SCTP_PACKET_DROPPED: 3446 case SCTP_INITIATION_ACK: /* this should not happen */ 3447 case SCTP_HEARTBEAT_ACK: 3448 case SCTP_ABORT_ASSOCIATION: 3449 case SCTP_OPERATION_ERROR: 3450 case SCTP_SHUTDOWN_COMPLETE: 3451 case SCTP_ECN_ECHO: 3452 case SCTP_ECN_CWR: 3453 default: 3454 break; 3455 } 3456 return (0); 3457} 3458 3459void 3460sctp_reset_in_stream(struct sctp_tcb *stcb, int number_entries, uint16_t * list) 3461{ 3462 int i; 3463 uint16_t temp; 3464 3465 /* 3466 * We set things to 0xffff since this is the last delivered sequence 3467 * and we will be sending in 0 after the reset. 3468 */ 3469 3470 if (number_entries) { 3471 for (i = 0; i < number_entries; i++) { 3472 temp = ntohs(list[i]); 3473 if (temp >= stcb->asoc.streamincnt) { 3474 continue; 3475 } 3476 stcb->asoc.strmin[temp].last_sequence_delivered = 0xffff; 3477 } 3478 } else { 3479 list = NULL; 3480 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3481 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff; 3482 } 3483 } 3484 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3485} 3486 3487static void 3488sctp_reset_out_streams(struct sctp_tcb *stcb, int number_entries, uint16_t * list) 3489{ 3490 int i; 3491 3492 if (number_entries == 0) { 3493 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3494 stcb->asoc.strmout[i].next_sequence_sent = 0; 3495 } 3496 } else if (number_entries) { 3497 for (i = 0; i < number_entries; i++) { 3498 uint16_t temp; 3499 3500 temp = ntohs(list[i]); 3501 if (temp >= stcb->asoc.streamoutcnt) { 3502 /* no such stream */ 3503 continue; 3504 } 3505 stcb->asoc.strmout[temp].next_sequence_sent = 0; 3506 } 3507 } 3508 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3509} 3510 3511 3512struct sctp_stream_reset_out_request * 3513sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk) 3514{ 3515 struct sctp_association *asoc; 3516 struct sctp_stream_reset_out_req *req; 3517 struct sctp_stream_reset_out_request *r; 3518 struct sctp_tmit_chunk *chk; 3519 int len, clen; 3520 3521 asoc = &stcb->asoc; 3522 if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 3523 asoc->stream_reset_outstanding = 0; 3524 return (NULL); 3525 } 3526 if (stcb->asoc.str_reset == NULL) { 3527 asoc->stream_reset_outstanding = 0; 3528 return (NULL); 3529 } 3530 chk = stcb->asoc.str_reset; 3531 if (chk->data == NULL) { 3532 return (NULL); 3533 } 3534 if (bchk) { 3535 /* he wants a copy of the chk pointer */ 3536 *bchk = chk; 3537 } 3538 clen = chk->send_size; 3539 req = mtod(chk->data, struct sctp_stream_reset_out_req *); 3540 r = &req->sr_req; 3541 if (ntohl(r->request_seq) == seq) { 3542 /* found it */ 3543 return (r); 3544 } 3545 len = SCTP_SIZE32(ntohs(r->ph.param_length)); 3546 if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) { 3547 /* move to the next one, there can only be a max of two */ 3548 r = (struct sctp_stream_reset_out_request *)((caddr_t)r + len); 3549 if (ntohl(r->request_seq) == seq) { 3550 return (r); 3551 } 3552 } 3553 /* that seq is not here */ 3554 return (NULL); 3555} 3556 3557static void 3558sctp_clean_up_stream_reset(struct sctp_tcb *stcb) 3559{ 3560 struct sctp_association *asoc; 3561 struct sctp_tmit_chunk *chk = stcb->asoc.str_reset; 3562 3563 if (stcb->asoc.str_reset == NULL) { 3564 return; 3565 } 3566 asoc = &stcb->asoc; 3567 3568 sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_26); 3569 TAILQ_REMOVE(&asoc->control_send_queue, 3570 chk, 3571 sctp_next); 3572 if (chk->data) { 3573 sctp_m_freem(chk->data); 3574 chk->data = NULL; 3575 } 3576 asoc->ctrl_queue_cnt--; 3577 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3578 /* sa_ignore NO_NULL_CHK */ 3579 stcb->asoc.str_reset = NULL; 3580} 3581 3582 3583static int 3584sctp_handle_stream_reset_response(struct sctp_tcb *stcb, 3585 uint32_t seq, uint32_t action, 3586 struct sctp_stream_reset_response *respin) 3587{ 3588 uint16_t type; 3589 int lparm_len; 3590 struct sctp_association *asoc = &stcb->asoc; 3591 struct sctp_tmit_chunk *chk; 3592 struct sctp_stream_reset_out_request *srparam; 3593 int number_entries; 3594 3595 if (asoc->stream_reset_outstanding == 0) { 3596 /* duplicate */ 3597 return (0); 3598 } 3599 if (seq == stcb->asoc.str_reset_seq_out) { 3600 srparam = sctp_find_stream_reset(stcb, seq, &chk); 3601 if (srparam) { 3602 stcb->asoc.str_reset_seq_out++; 3603 type = ntohs(srparam->ph.param_type); 3604 lparm_len = ntohs(srparam->ph.param_length); 3605 if (type == SCTP_STR_RESET_OUT_REQUEST) { 3606 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t); 3607 asoc->stream_reset_out_is_outstanding = 0; 3608 if (asoc->stream_reset_outstanding) 3609 asoc->stream_reset_outstanding--; 3610 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3611 /* do it */ 3612 sctp_reset_out_streams(stcb, number_entries, srparam->list_of_streams); 3613 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3614 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED); 3615 } else { 3616 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED); 3617 } 3618 } else if (type == SCTP_STR_RESET_IN_REQUEST) { 3619 /* Answered my request */ 3620 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t); 3621 if (asoc->stream_reset_outstanding) 3622 asoc->stream_reset_outstanding--; 3623 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3624 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb, 3625 number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED); 3626 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3627 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb, 3628 number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED); 3629 } 3630 } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) { 3631 /* Ok we now may have more streams */ 3632 int num_stream; 3633 3634 num_stream = stcb->asoc.strm_pending_add_size; 3635 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) { 3636 /* TSNH */ 3637 num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt; 3638 } 3639 stcb->asoc.strm_pending_add_size = 0; 3640 if (asoc->stream_reset_outstanding) 3641 asoc->stream_reset_outstanding--; 3642 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3643 /* Put the new streams into effect */ 3644 stcb->asoc.streamoutcnt += num_stream; 3645 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 3646 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3647 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3648 SCTP_STREAM_CHANGE_DENIED); 3649 } else { 3650 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3651 SCTP_STREAM_CHANGE_FAILED); 3652 } 3653 } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) { 3654 if (asoc->stream_reset_outstanding) 3655 asoc->stream_reset_outstanding--; 3656 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3657 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3658 SCTP_STREAM_CHANGE_DENIED); 3659 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3660 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3661 SCTP_STREAM_CHANGE_FAILED); 3662 } 3663 } else if (type == SCTP_STR_RESET_TSN_REQUEST) { 3664 /** 3665 * a) Adopt the new in tsn. 3666 * b) reset the map 3667 * c) Adopt the new out-tsn 3668 */ 3669 struct sctp_stream_reset_response_tsn *resp; 3670 struct sctp_forward_tsn_chunk fwdtsn; 3671 int abort_flag = 0; 3672 3673 if (respin == NULL) { 3674 /* huh ? */ 3675 return (0); 3676 } 3677 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3678 resp = (struct sctp_stream_reset_response_tsn *)respin; 3679 asoc->stream_reset_outstanding--; 3680 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3681 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3682 fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1); 3683 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3684 if (abort_flag) { 3685 return (1); 3686 } 3687 stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1); 3688 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3689 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3690 } 3691 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 3692 stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn); 3693 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 3694 3695 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map; 3696 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size); 3697 3698 stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn); 3699 stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn; 3700 3701 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL); 3702 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL); 3703 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0); 3704 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3705 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3706 SCTP_ASSOC_RESET_DENIED); 3707 } else { 3708 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3709 SCTP_ASSOC_RESET_FAILED); 3710 } 3711 } 3712 /* get rid of the request and get the request flags */ 3713 if (asoc->stream_reset_outstanding == 0) { 3714 sctp_clean_up_stream_reset(stcb); 3715 } 3716 } 3717 } 3718 return (0); 3719} 3720 3721static void 3722sctp_handle_str_reset_request_in(struct sctp_tcb *stcb, 3723 struct sctp_tmit_chunk *chk, 3724 struct sctp_stream_reset_in_request *req, int trunc) 3725{ 3726 uint32_t seq; 3727 int len, i; 3728 int number_entries; 3729 uint16_t temp; 3730 3731 /* 3732 * peer wants me to send a str-reset to him for my outgoing seq's if 3733 * seq_in is right. 3734 */ 3735 struct sctp_association *asoc = &stcb->asoc; 3736 3737 seq = ntohl(req->request_seq); 3738 if (asoc->str_reset_seq_in == seq) { 3739 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3740 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3741 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3742 } else if (trunc) { 3743 /* Can't do it, since they exceeded our buffer size */ 3744 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3745 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) { 3746 len = ntohs(req->ph.param_length); 3747 number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t)); 3748 for (i = 0; i < number_entries; i++) { 3749 temp = ntohs(req->list_of_streams[i]); 3750 req->list_of_streams[i] = temp; 3751 } 3752 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3753 sctp_add_stream_reset_out(chk, number_entries, req->list_of_streams, 3754 asoc->str_reset_seq_out, 3755 seq, (asoc->sending_seq - 1)); 3756 asoc->stream_reset_out_is_outstanding = 1; 3757 asoc->str_reset = chk; 3758 sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo); 3759 stcb->asoc.stream_reset_outstanding++; 3760 } else { 3761 /* Can't do it, since we have sent one out */ 3762 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 3763 } 3764 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3765 asoc->str_reset_seq_in++; 3766 } else if (asoc->str_reset_seq_in - 1 == seq) { 3767 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3768 } else if (asoc->str_reset_seq_in - 2 == seq) { 3769 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3770 } else { 3771 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3772 } 3773} 3774 3775static int 3776sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb, 3777 struct sctp_tmit_chunk *chk, 3778 struct sctp_stream_reset_tsn_request *req) 3779{ 3780 /* reset all in and out and update the tsn */ 3781 /* 3782 * A) reset my str-seq's on in and out. B) Select a receive next, 3783 * and set cum-ack to it. Also process this selected number as a 3784 * fwd-tsn as well. C) set in the response my next sending seq. 3785 */ 3786 struct sctp_forward_tsn_chunk fwdtsn; 3787 struct sctp_association *asoc = &stcb->asoc; 3788 int abort_flag = 0; 3789 uint32_t seq; 3790 3791 seq = ntohl(req->request_seq); 3792 if (asoc->str_reset_seq_in == seq) { 3793 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3794 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 3795 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3796 } else { 3797 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3798 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3799 fwdtsn.ch.chunk_flags = 0; 3800 fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1); 3801 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3802 if (abort_flag) { 3803 return (1); 3804 } 3805 asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA; 3806 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3807 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3808 } 3809 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map; 3810 asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1; 3811 memset(asoc->mapping_array, 0, asoc->mapping_array_size); 3812 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 3813 memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size); 3814 atomic_add_int(&asoc->sending_seq, 1); 3815 /* save off historical data for retrans */ 3816 asoc->last_sending_seq[1] = asoc->last_sending_seq[0]; 3817 asoc->last_sending_seq[0] = asoc->sending_seq; 3818 asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0]; 3819 asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn; 3820 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL); 3821 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL); 3822 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3823 sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0); 3824 } 3825 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3826 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3827 asoc->str_reset_seq_in++; 3828 } else if (asoc->str_reset_seq_in - 1 == seq) { 3829 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3830 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3831 } else if (asoc->str_reset_seq_in - 2 == seq) { 3832 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1], 3833 asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]); 3834 } else { 3835 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3836 } 3837 return (0); 3838} 3839 3840static void 3841sctp_handle_str_reset_request_out(struct sctp_tcb *stcb, 3842 struct sctp_tmit_chunk *chk, 3843 struct sctp_stream_reset_out_request *req, int trunc) 3844{ 3845 uint32_t seq, tsn; 3846 int number_entries, len; 3847 struct sctp_association *asoc = &stcb->asoc; 3848 3849 seq = ntohl(req->request_seq); 3850 3851 /* now if its not a duplicate we process it */ 3852 if (asoc->str_reset_seq_in == seq) { 3853 len = ntohs(req->ph.param_length); 3854 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t)); 3855 /* 3856 * the sender is resetting, handle the list issue.. we must 3857 * a) verify if we can do the reset, if so no problem b) If 3858 * we can't do the reset we must copy the request. c) queue 3859 * it, and setup the data in processor to trigger it off 3860 * when needed and dequeue all the queued data. 3861 */ 3862 tsn = ntohl(req->send_reset_at_tsn); 3863 3864 /* move the reset action back one */ 3865 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3866 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3867 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3868 } else if (trunc) { 3869 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3870 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) { 3871 /* we can do it now */ 3872 sctp_reset_in_stream(stcb, number_entries, req->list_of_streams); 3873 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3874 } else { 3875 /* 3876 * we must queue it up and thus wait for the TSN's 3877 * to arrive that are at or before tsn 3878 */ 3879 struct sctp_stream_reset_list *liste; 3880 int siz; 3881 3882 siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t)); 3883 SCTP_MALLOC(liste, struct sctp_stream_reset_list *, 3884 siz, SCTP_M_STRESET); 3885 if (liste == NULL) { 3886 /* gak out of memory */ 3887 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3888 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3889 return; 3890 } 3891 liste->tsn = tsn; 3892 liste->number_entries = number_entries; 3893 memcpy(&liste->req, req, 3894 (sizeof(struct sctp_stream_reset_out_request) + (number_entries * sizeof(uint16_t)))); 3895 TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp); 3896 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3897 } 3898 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3899 asoc->str_reset_seq_in++; 3900 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3901 /* 3902 * one seq back, just echo back last action since my 3903 * response was lost. 3904 */ 3905 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3906 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3907 /* 3908 * two seq back, just echo back last action since my 3909 * response was lost. 3910 */ 3911 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3912 } else { 3913 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3914 } 3915} 3916 3917static void 3918sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 3919 struct sctp_stream_reset_add_strm *str_add) 3920{ 3921 /* 3922 * Peer is requesting to add more streams. If its within our 3923 * max-streams we will allow it. 3924 */ 3925 uint32_t num_stream, i; 3926 uint32_t seq; 3927 struct sctp_association *asoc = &stcb->asoc; 3928 struct sctp_queued_to_read *ctl, *nctl; 3929 3930 /* Get the number. */ 3931 seq = ntohl(str_add->request_seq); 3932 num_stream = ntohs(str_add->number_of_streams); 3933 /* Now what would be the new total? */ 3934 if (asoc->str_reset_seq_in == seq) { 3935 num_stream += stcb->asoc.streamincnt; 3936 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3937 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 3938 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3939 } else if ((num_stream > stcb->asoc.max_inbound_streams) || 3940 (num_stream > 0xffff)) { 3941 /* We must reject it they ask for to many */ 3942 denied: 3943 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3944 } else { 3945 /* Ok, we can do that :-) */ 3946 struct sctp_stream_in *oldstrm; 3947 3948 /* save off the old */ 3949 oldstrm = stcb->asoc.strmin; 3950 SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *, 3951 (num_stream * sizeof(struct sctp_stream_in)), 3952 SCTP_M_STRMI); 3953 if (stcb->asoc.strmin == NULL) { 3954 stcb->asoc.strmin = oldstrm; 3955 goto denied; 3956 } 3957 /* copy off the old data */ 3958 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3959 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 3960 stcb->asoc.strmin[i].stream_no = i; 3961 stcb->asoc.strmin[i].last_sequence_delivered = oldstrm[i].last_sequence_delivered; 3962 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started; 3963 /* now anything on those queues? */ 3964 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next, nctl) { 3965 TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next); 3966 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next); 3967 } 3968 } 3969 /* Init the new streams */ 3970 for (i = stcb->asoc.streamincnt; i < num_stream; i++) { 3971 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 3972 stcb->asoc.strmin[i].stream_no = i; 3973 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff; 3974 stcb->asoc.strmin[i].delivery_started = 0; 3975 } 3976 SCTP_FREE(oldstrm, SCTP_M_STRMI); 3977 /* update the size */ 3978 stcb->asoc.streamincnt = num_stream; 3979 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3980 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 3981 } 3982 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3983 asoc->str_reset_seq_in++; 3984 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3985 /* 3986 * one seq back, just echo back last action since my 3987 * response was lost. 3988 */ 3989 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3990 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3991 /* 3992 * two seq back, just echo back last action since my 3993 * response was lost. 3994 */ 3995 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3996 } else { 3997 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3998 3999 } 4000} 4001 4002static void 4003sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 4004 struct sctp_stream_reset_add_strm *str_add) 4005{ 4006 /* 4007 * Peer is requesting to add more streams. If its within our 4008 * max-streams we will allow it. 4009 */ 4010 uint16_t num_stream; 4011 uint32_t seq; 4012 struct sctp_association *asoc = &stcb->asoc; 4013 4014 /* Get the number. */ 4015 seq = ntohl(str_add->request_seq); 4016 num_stream = ntohs(str_add->number_of_streams); 4017 /* Now what would be the new total? */ 4018 if (asoc->str_reset_seq_in == seq) { 4019 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 4020 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 4021 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4022 } else if (stcb->asoc.stream_reset_outstanding) { 4023 /* We must reject it we have something pending */ 4024 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 4025 } else { 4026 /* Ok, we can do that :-) */ 4027 int mychk; 4028 4029 mychk = stcb->asoc.streamoutcnt; 4030 mychk += num_stream; 4031 if (mychk < 0x10000) { 4032 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 4033 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 0, 1, num_stream, 0, 1)) { 4034 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4035 } 4036 } else { 4037 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4038 } 4039 } 4040 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]); 4041 asoc->str_reset_seq_in++; 4042 } else if ((asoc->str_reset_seq_in - 1) == seq) { 4043 /* 4044 * one seq back, just echo back last action since my 4045 * response was lost. 4046 */ 4047 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4048 } else if ((asoc->str_reset_seq_in - 2) == seq) { 4049 /* 4050 * two seq back, just echo back last action since my 4051 * response was lost. 4052 */ 4053 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 4054 } else { 4055 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 4056 } 4057} 4058 4059#ifdef __GNUC__ 4060__attribute__((noinline)) 4061#endif 4062 static int 4063 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset, 4064 struct sctp_stream_reset_out_req *sr_req) 4065{ 4066 int chk_length, param_len, ptype; 4067 struct sctp_paramhdr pstore; 4068 uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE]; 4069 uint32_t seq = 0; 4070 int num_req = 0; 4071 int trunc = 0; 4072 struct sctp_tmit_chunk *chk; 4073 struct sctp_chunkhdr *ch; 4074 struct sctp_paramhdr *ph; 4075 int ret_code = 0; 4076 int num_param = 0; 4077 4078 /* now it may be a reset or a reset-response */ 4079 chk_length = ntohs(sr_req->ch.chunk_length); 4080 4081 /* setup for adding the response */ 4082 sctp_alloc_a_chunk(stcb, chk); 4083 if (chk == NULL) { 4084 return (ret_code); 4085 } 4086 chk->rec.chunk_id.id = SCTP_STREAM_RESET; 4087 chk->rec.chunk_id.can_take_data = 0; 4088 chk->asoc = &stcb->asoc; 4089 chk->no_fr_allowed = 0; 4090 chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr); 4091 chk->book_size_scale = 0; 4092 chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA); 4093 if (chk->data == NULL) { 4094strres_nochunk: 4095 if (chk->data) { 4096 sctp_m_freem(chk->data); 4097 chk->data = NULL; 4098 } 4099 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 4100 return (ret_code); 4101 } 4102 SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD); 4103 4104 /* setup chunk parameters */ 4105 chk->sent = SCTP_DATAGRAM_UNSENT; 4106 chk->snd_count = 0; 4107 chk->whoTo = NULL; 4108 4109 ch = mtod(chk->data, struct sctp_chunkhdr *); 4110 ch->chunk_type = SCTP_STREAM_RESET; 4111 ch->chunk_flags = 0; 4112 ch->chunk_length = htons(chk->send_size); 4113 SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size); 4114 offset += sizeof(struct sctp_chunkhdr); 4115 while ((size_t)chk_length >= sizeof(struct sctp_stream_reset_tsn_request)) { 4116 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *) & pstore); 4117 if (ph == NULL) 4118 break; 4119 param_len = ntohs(ph->param_length); 4120 if (param_len < (int)sizeof(struct sctp_stream_reset_tsn_request)) { 4121 /* bad param */ 4122 break; 4123 } 4124 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, (int)sizeof(cstore)), 4125 (uint8_t *) & cstore); 4126 ptype = ntohs(ph->param_type); 4127 num_param++; 4128 if (param_len > (int)sizeof(cstore)) { 4129 trunc = 1; 4130 } else { 4131 trunc = 0; 4132 } 4133 if (num_param > SCTP_MAX_RESET_PARAMS) { 4134 /* hit the max of parameters already sorry.. */ 4135 break; 4136 } 4137 if (ptype == SCTP_STR_RESET_OUT_REQUEST) { 4138 struct sctp_stream_reset_out_request *req_out; 4139 4140 req_out = (struct sctp_stream_reset_out_request *)ph; 4141 num_req++; 4142 if (stcb->asoc.stream_reset_outstanding) { 4143 seq = ntohl(req_out->response_seq); 4144 if (seq == stcb->asoc.str_reset_seq_out) { 4145 /* implicit ack */ 4146 (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL); 4147 } 4148 } 4149 sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc); 4150 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) { 4151 struct sctp_stream_reset_add_strm *str_add; 4152 4153 str_add = (struct sctp_stream_reset_add_strm *)ph; 4154 num_req++; 4155 sctp_handle_str_reset_add_strm(stcb, chk, str_add); 4156 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) { 4157 struct sctp_stream_reset_add_strm *str_add; 4158 4159 str_add = (struct sctp_stream_reset_add_strm *)ph; 4160 num_req++; 4161 sctp_handle_str_reset_add_out_strm(stcb, chk, str_add); 4162 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) { 4163 struct sctp_stream_reset_in_request *req_in; 4164 4165 num_req++; 4166 req_in = (struct sctp_stream_reset_in_request *)ph; 4167 sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc); 4168 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) { 4169 struct sctp_stream_reset_tsn_request *req_tsn; 4170 4171 num_req++; 4172 req_tsn = (struct sctp_stream_reset_tsn_request *)ph; 4173 if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) { 4174 ret_code = 1; 4175 goto strres_nochunk; 4176 } 4177 /* no more */ 4178 break; 4179 } else if (ptype == SCTP_STR_RESET_RESPONSE) { 4180 struct sctp_stream_reset_response *resp; 4181 uint32_t result; 4182 4183 resp = (struct sctp_stream_reset_response *)ph; 4184 seq = ntohl(resp->response_seq); 4185 result = ntohl(resp->result); 4186 if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) { 4187 ret_code = 1; 4188 goto strres_nochunk; 4189 } 4190 } else { 4191 break; 4192 } 4193 offset += SCTP_SIZE32(param_len); 4194 chk_length -= SCTP_SIZE32(param_len); 4195 } 4196 if (num_req == 0) { 4197 /* we have no response free the stuff */ 4198 goto strres_nochunk; 4199 } 4200 /* ok we have a chunk to link in */ 4201 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, 4202 chk, 4203 sctp_next); 4204 stcb->asoc.ctrl_queue_cnt++; 4205 return (ret_code); 4206} 4207 4208/* 4209 * Handle a router or endpoints report of a packet loss, there are two ways 4210 * to handle this, either we get the whole packet and must disect it 4211 * ourselves (possibly with truncation and or corruption) or it is a summary 4212 * from a middle box that did the disectting for us. 4213 */ 4214static void 4215sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp, 4216 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 4217{ 4218 uint32_t bottle_bw, on_queue; 4219 uint16_t trunc_len; 4220 unsigned int chlen; 4221 unsigned int at; 4222 struct sctp_chunk_desc desc; 4223 struct sctp_chunkhdr *ch; 4224 4225 chlen = ntohs(cp->ch.chunk_length); 4226 chlen -= sizeof(struct sctp_pktdrop_chunk); 4227 /* XXX possible chlen underflow */ 4228 if (chlen == 0) { 4229 ch = NULL; 4230 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) 4231 SCTP_STAT_INCR(sctps_pdrpbwrpt); 4232 } else { 4233 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr)); 4234 chlen -= sizeof(struct sctphdr); 4235 /* XXX possible chlen underflow */ 4236 memset(&desc, 0, sizeof(desc)); 4237 } 4238 trunc_len = (uint16_t) ntohs(cp->trunc_len); 4239 if (trunc_len > limit) { 4240 trunc_len = limit; 4241 } 4242 /* now the chunks themselves */ 4243 while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) { 4244 desc.chunk_type = ch->chunk_type; 4245 /* get amount we need to move */ 4246 at = ntohs(ch->chunk_length); 4247 if (at < sizeof(struct sctp_chunkhdr)) { 4248 /* corrupt chunk, maybe at the end? */ 4249 SCTP_STAT_INCR(sctps_pdrpcrupt); 4250 break; 4251 } 4252 if (trunc_len == 0) { 4253 /* we are supposed to have all of it */ 4254 if (at > chlen) { 4255 /* corrupt skip it */ 4256 SCTP_STAT_INCR(sctps_pdrpcrupt); 4257 break; 4258 } 4259 } else { 4260 /* is there enough of it left ? */ 4261 if (desc.chunk_type == SCTP_DATA) { 4262 if (chlen < (sizeof(struct sctp_data_chunk) + 4263 sizeof(desc.data_bytes))) { 4264 break; 4265 } 4266 } else { 4267 if (chlen < sizeof(struct sctp_chunkhdr)) { 4268 break; 4269 } 4270 } 4271 } 4272 if (desc.chunk_type == SCTP_DATA) { 4273 /* can we get out the tsn? */ 4274 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4275 SCTP_STAT_INCR(sctps_pdrpmbda); 4276 4277 if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) { 4278 /* yep */ 4279 struct sctp_data_chunk *dcp; 4280 uint8_t *ddp; 4281 unsigned int iii; 4282 4283 dcp = (struct sctp_data_chunk *)ch; 4284 ddp = (uint8_t *) (dcp + 1); 4285 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) { 4286 desc.data_bytes[iii] = ddp[iii]; 4287 } 4288 desc.tsn_ifany = dcp->dp.tsn; 4289 } else { 4290 /* nope we are done. */ 4291 SCTP_STAT_INCR(sctps_pdrpnedat); 4292 break; 4293 } 4294 } else { 4295 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4296 SCTP_STAT_INCR(sctps_pdrpmbct); 4297 } 4298 4299 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) { 4300 SCTP_STAT_INCR(sctps_pdrppdbrk); 4301 break; 4302 } 4303 if (SCTP_SIZE32(at) > chlen) { 4304 break; 4305 } 4306 chlen -= SCTP_SIZE32(at); 4307 if (chlen < sizeof(struct sctp_chunkhdr)) { 4308 /* done, none left */ 4309 break; 4310 } 4311 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at)); 4312 } 4313 /* Now update any rwnd --- possibly */ 4314 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) { 4315 /* From a peer, we get a rwnd report */ 4316 uint32_t a_rwnd; 4317 4318 SCTP_STAT_INCR(sctps_pdrpfehos); 4319 4320 bottle_bw = ntohl(cp->bottle_bw); 4321 on_queue = ntohl(cp->current_onq); 4322 if (bottle_bw && on_queue) { 4323 /* a rwnd report is in here */ 4324 if (bottle_bw > on_queue) 4325 a_rwnd = bottle_bw - on_queue; 4326 else 4327 a_rwnd = 0; 4328 4329 if (a_rwnd == 0) 4330 stcb->asoc.peers_rwnd = 0; 4331 else { 4332 if (a_rwnd > stcb->asoc.total_flight) { 4333 stcb->asoc.peers_rwnd = 4334 a_rwnd - stcb->asoc.total_flight; 4335 } else { 4336 stcb->asoc.peers_rwnd = 0; 4337 } 4338 if (stcb->asoc.peers_rwnd < 4339 stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 4340 /* SWS sender side engages */ 4341 stcb->asoc.peers_rwnd = 0; 4342 } 4343 } 4344 } 4345 } else { 4346 SCTP_STAT_INCR(sctps_pdrpfmbox); 4347 } 4348 4349 /* now middle boxes in sat networks get a cwnd bump */ 4350 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) && 4351 (stcb->asoc.sat_t3_loss_recovery == 0) && 4352 (stcb->asoc.sat_network)) { 4353 /* 4354 * This is debateable but for sat networks it makes sense 4355 * Note if a T3 timer has went off, we will prohibit any 4356 * changes to cwnd until we exit the t3 loss recovery. 4357 */ 4358 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb, 4359 net, cp, &bottle_bw, &on_queue); 4360 } 4361} 4362 4363/* 4364 * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to 4365 * still contain IP/SCTP header - stcb: is the tcb found for this packet - 4366 * offset: offset into the mbuf chain to first chunkhdr - length: is the 4367 * length of the complete packet outputs: - length: modified to remaining 4368 * length after control processing - netp: modified to new sctp_nets after 4369 * cookie-echo processing - return NULL to discard the packet (ie. no asoc, 4370 * bad packet,...) otherwise return the tcb for this packet 4371 */ 4372#ifdef __GNUC__ 4373__attribute__((noinline)) 4374#endif 4375 static struct sctp_tcb * 4376 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length, 4377 struct sockaddr *src, struct sockaddr *dst, 4378 struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp, 4379 struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen, 4380 uint8_t use_mflowid, uint32_t mflowid, 4381 uint32_t vrf_id, uint16_t port) 4382{ 4383 struct sctp_association *asoc; 4384 uint32_t vtag_in; 4385 int num_chunks = 0; /* number of control chunks processed */ 4386 uint32_t chk_length; 4387 int ret; 4388 int abort_no_unlock = 0; 4389 int ecne_seen = 0; 4390 4391 /* 4392 * How big should this be, and should it be alloc'd? Lets try the 4393 * d-mtu-ceiling for now (2k) and that should hopefully work ... 4394 * until we get into jumbo grams and such.. 4395 */ 4396 uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE]; 4397 struct sctp_tcb *locked_tcb = stcb; 4398 int got_auth = 0; 4399 uint32_t auth_offset = 0, auth_len = 0; 4400 int auth_skipped = 0; 4401 int asconf_cnt = 0; 4402 4403#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4404 struct socket *so; 4405 4406#endif 4407 4408 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n", 4409 iphlen, *offset, length, stcb); 4410 4411 /* validate chunk header length... */ 4412 if (ntohs(ch->chunk_length) < sizeof(*ch)) { 4413 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n", 4414 ntohs(ch->chunk_length)); 4415 if (locked_tcb) { 4416 SCTP_TCB_UNLOCK(locked_tcb); 4417 } 4418 return (NULL); 4419 } 4420 /* 4421 * validate the verification tag 4422 */ 4423 vtag_in = ntohl(sh->v_tag); 4424 4425 if (locked_tcb) { 4426 SCTP_TCB_LOCK_ASSERT(locked_tcb); 4427 } 4428 if (ch->chunk_type == SCTP_INITIATION) { 4429 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n", 4430 ntohs(ch->chunk_length), vtag_in); 4431 if (vtag_in != 0) { 4432 /* protocol error- silently discard... */ 4433 SCTP_STAT_INCR(sctps_badvtag); 4434 if (locked_tcb) { 4435 SCTP_TCB_UNLOCK(locked_tcb); 4436 } 4437 return (NULL); 4438 } 4439 } else if (ch->chunk_type != SCTP_COOKIE_ECHO) { 4440 /* 4441 * If there is no stcb, skip the AUTH chunk and process 4442 * later after a stcb is found (to validate the lookup was 4443 * valid. 4444 */ 4445 if ((ch->chunk_type == SCTP_AUTHENTICATION) && 4446 (stcb == NULL) && 4447 !SCTP_BASE_SYSCTL(sctp_auth_disable)) { 4448 /* save this chunk for later processing */ 4449 auth_skipped = 1; 4450 auth_offset = *offset; 4451 auth_len = ntohs(ch->chunk_length); 4452 4453 /* (temporarily) move past this chunk */ 4454 *offset += SCTP_SIZE32(auth_len); 4455 if (*offset >= length) { 4456 /* no more data left in the mbuf chain */ 4457 *offset = length; 4458 if (locked_tcb) { 4459 SCTP_TCB_UNLOCK(locked_tcb); 4460 } 4461 return (NULL); 4462 } 4463 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4464 sizeof(struct sctp_chunkhdr), chunk_buf); 4465 } 4466 if (ch == NULL) { 4467 /* Help */ 4468 *offset = length; 4469 if (locked_tcb) { 4470 SCTP_TCB_UNLOCK(locked_tcb); 4471 } 4472 return (NULL); 4473 } 4474 if (ch->chunk_type == SCTP_COOKIE_ECHO) { 4475 goto process_control_chunks; 4476 } 4477 /* 4478 * first check if it's an ASCONF with an unknown src addr we 4479 * need to look inside to find the association 4480 */ 4481 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) { 4482 struct sctp_chunkhdr *asconf_ch = ch; 4483 uint32_t asconf_offset = 0, asconf_len = 0; 4484 4485 /* inp's refcount may be reduced */ 4486 SCTP_INP_INCR_REF(inp); 4487 4488 asconf_offset = *offset; 4489 do { 4490 asconf_len = ntohs(asconf_ch->chunk_length); 4491 if (asconf_len < sizeof(struct sctp_asconf_paramhdr)) 4492 break; 4493 stcb = sctp_findassociation_ep_asconf(m, 4494 *offset, 4495 dst, 4496 sh, &inp, netp, vrf_id); 4497 if (stcb != NULL) 4498 break; 4499 asconf_offset += SCTP_SIZE32(asconf_len); 4500 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset, 4501 sizeof(struct sctp_chunkhdr), chunk_buf); 4502 } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF); 4503 if (stcb == NULL) { 4504 /* 4505 * reduce inp's refcount if not reduced in 4506 * sctp_findassociation_ep_asconf(). 4507 */ 4508 SCTP_INP_DECR_REF(inp); 4509 } else { 4510 locked_tcb = stcb; 4511 } 4512 4513 /* now go back and verify any auth chunk to be sure */ 4514 if (auth_skipped && (stcb != NULL)) { 4515 struct sctp_auth_chunk *auth; 4516 4517 auth = (struct sctp_auth_chunk *) 4518 sctp_m_getptr(m, auth_offset, 4519 auth_len, chunk_buf); 4520 got_auth = 1; 4521 auth_skipped = 0; 4522 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, 4523 auth_offset)) { 4524 /* auth HMAC failed so dump it */ 4525 *offset = length; 4526 if (locked_tcb) { 4527 SCTP_TCB_UNLOCK(locked_tcb); 4528 } 4529 return (NULL); 4530 } else { 4531 /* remaining chunks are HMAC checked */ 4532 stcb->asoc.authenticated = 1; 4533 } 4534 } 4535 } 4536 if (stcb == NULL) { 4537 /* no association, so it's out of the blue... */ 4538 sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, 4539 use_mflowid, mflowid, 4540 vrf_id, port); 4541 *offset = length; 4542 if (locked_tcb) { 4543 SCTP_TCB_UNLOCK(locked_tcb); 4544 } 4545 return (NULL); 4546 } 4547 asoc = &stcb->asoc; 4548 /* ABORT and SHUTDOWN can use either v_tag... */ 4549 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) || 4550 (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) || 4551 (ch->chunk_type == SCTP_PACKET_DROPPED)) { 4552 if ((vtag_in == asoc->my_vtag) || 4553 ((ch->chunk_flags & SCTP_HAD_NO_TCB) && 4554 (vtag_in == asoc->peer_vtag))) { 4555 /* this is valid */ 4556 } else { 4557 /* drop this packet... */ 4558 SCTP_STAT_INCR(sctps_badvtag); 4559 if (locked_tcb) { 4560 SCTP_TCB_UNLOCK(locked_tcb); 4561 } 4562 return (NULL); 4563 } 4564 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 4565 if (vtag_in != asoc->my_vtag) { 4566 /* 4567 * this could be a stale SHUTDOWN-ACK or the 4568 * peer never got the SHUTDOWN-COMPLETE and 4569 * is still hung; we have started a new asoc 4570 * but it won't complete until the shutdown 4571 * is completed 4572 */ 4573 if (locked_tcb) { 4574 SCTP_TCB_UNLOCK(locked_tcb); 4575 } 4576 sctp_handle_ootb(m, iphlen, *offset, src, dst, 4577 sh, inp, 4578 use_mflowid, mflowid, 4579 vrf_id, port); 4580 return (NULL); 4581 } 4582 } else { 4583 /* for all other chunks, vtag must match */ 4584 if (vtag_in != asoc->my_vtag) { 4585 /* invalid vtag... */ 4586 SCTPDBG(SCTP_DEBUG_INPUT3, 4587 "invalid vtag: %xh, expect %xh\n", 4588 vtag_in, asoc->my_vtag); 4589 SCTP_STAT_INCR(sctps_badvtag); 4590 if (locked_tcb) { 4591 SCTP_TCB_UNLOCK(locked_tcb); 4592 } 4593 *offset = length; 4594 return (NULL); 4595 } 4596 } 4597 } /* end if !SCTP_COOKIE_ECHO */ 4598 /* 4599 * process all control chunks... 4600 */ 4601 if (((ch->chunk_type == SCTP_SELECTIVE_ACK) || 4602 (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) || 4603 (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) && 4604 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) { 4605 /* implied cookie-ack.. we must have lost the ack */ 4606 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4607 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4608 stcb->asoc.overall_error_count, 4609 0, 4610 SCTP_FROM_SCTP_INPUT, 4611 __LINE__); 4612 } 4613 stcb->asoc.overall_error_count = 0; 4614 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, 4615 *netp); 4616 } 4617process_control_chunks: 4618 while (IS_SCTP_CONTROL(ch)) { 4619 /* validate chunk length */ 4620 chk_length = ntohs(ch->chunk_length); 4621 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n", 4622 ch->chunk_type, chk_length); 4623 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length); 4624 if (chk_length < sizeof(*ch) || 4625 (*offset + (int)chk_length) > length) { 4626 *offset = length; 4627 if (locked_tcb) { 4628 SCTP_TCB_UNLOCK(locked_tcb); 4629 } 4630 return (NULL); 4631 } 4632 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks); 4633 /* 4634 * INIT-ACK only gets the init ack "header" portion only 4635 * because we don't have to process the peer's COOKIE. All 4636 * others get a complete chunk. 4637 */ 4638 if ((ch->chunk_type == SCTP_INITIATION_ACK) || 4639 (ch->chunk_type == SCTP_INITIATION)) { 4640 /* get an init-ack chunk */ 4641 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4642 sizeof(struct sctp_init_ack_chunk), chunk_buf); 4643 if (ch == NULL) { 4644 *offset = length; 4645 if (locked_tcb) { 4646 SCTP_TCB_UNLOCK(locked_tcb); 4647 } 4648 return (NULL); 4649 } 4650 } else { 4651 /* For cookies and all other chunks. */ 4652 if (chk_length > sizeof(chunk_buf)) { 4653 /* 4654 * use just the size of the chunk buffer so 4655 * the front part of our chunks fit in 4656 * contiguous space up to the chunk buffer 4657 * size (508 bytes). For chunks that need to 4658 * get more than that they must use the 4659 * sctp_m_getptr() function or other means 4660 * (e.g. know how to parse mbuf chains). 4661 * Cookies do this already. 4662 */ 4663 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4664 (sizeof(chunk_buf) - 4), 4665 chunk_buf); 4666 if (ch == NULL) { 4667 *offset = length; 4668 if (locked_tcb) { 4669 SCTP_TCB_UNLOCK(locked_tcb); 4670 } 4671 return (NULL); 4672 } 4673 } else { 4674 /* We can fit it all */ 4675 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4676 chk_length, chunk_buf); 4677 if (ch == NULL) { 4678 SCTP_PRINTF("sctp_process_control: Can't get the all data....\n"); 4679 *offset = length; 4680 if (locked_tcb) { 4681 SCTP_TCB_UNLOCK(locked_tcb); 4682 } 4683 return (NULL); 4684 } 4685 } 4686 } 4687 num_chunks++; 4688 /* Save off the last place we got a control from */ 4689 if (stcb != NULL) { 4690 if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) { 4691 /* 4692 * allow last_control to be NULL if 4693 * ASCONF... ASCONF processing will find the 4694 * right net later 4695 */ 4696 if ((netp != NULL) && (*netp != NULL)) 4697 stcb->asoc.last_control_chunk_from = *netp; 4698 } 4699 } 4700#ifdef SCTP_AUDITING_ENABLED 4701 sctp_audit_log(0xB0, ch->chunk_type); 4702#endif 4703 4704 /* check to see if this chunk required auth, but isn't */ 4705 if ((stcb != NULL) && 4706 !SCTP_BASE_SYSCTL(sctp_auth_disable) && 4707 sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) && 4708 !stcb->asoc.authenticated) { 4709 /* "silently" ignore */ 4710 SCTP_STAT_INCR(sctps_recvauthmissing); 4711 goto next_chunk; 4712 } 4713 switch (ch->chunk_type) { 4714 case SCTP_INITIATION: 4715 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n"); 4716 /* The INIT chunk must be the only chunk. */ 4717 if ((num_chunks > 1) || 4718 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4719 sctp_abort_association(inp, stcb, m, iphlen, 4720 src, dst, sh, NULL, 4721 use_mflowid, mflowid, 4722 vrf_id, port); 4723 *offset = length; 4724 return (NULL); 4725 } 4726 /* Honor our resource limit. */ 4727 if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) { 4728 struct mbuf *op_err; 4729 4730 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC); 4731 sctp_abort_association(inp, stcb, m, iphlen, 4732 src, dst, sh, op_err, 4733 use_mflowid, mflowid, 4734 vrf_id, port); 4735 *offset = length; 4736 return (NULL); 4737 } 4738 sctp_handle_init(m, iphlen, *offset, src, dst, sh, 4739 (struct sctp_init_chunk *)ch, inp, 4740 stcb, &abort_no_unlock, 4741 use_mflowid, mflowid, 4742 vrf_id, port); 4743 *offset = length; 4744 if ((!abort_no_unlock) && (locked_tcb)) { 4745 SCTP_TCB_UNLOCK(locked_tcb); 4746 } 4747 return (NULL); 4748 break; 4749 case SCTP_PAD_CHUNK: 4750 break; 4751 case SCTP_INITIATION_ACK: 4752 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT-ACK\n"); 4753 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4754 /* We are not interested anymore */ 4755 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4756 ; 4757 } else { 4758 if (locked_tcb != stcb) { 4759 /* Very unlikely */ 4760 SCTP_TCB_UNLOCK(locked_tcb); 4761 } 4762 *offset = length; 4763 if (stcb) { 4764#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4765 so = SCTP_INP_SO(inp); 4766 atomic_add_int(&stcb->asoc.refcnt, 1); 4767 SCTP_TCB_UNLOCK(stcb); 4768 SCTP_SOCKET_LOCK(so, 1); 4769 SCTP_TCB_LOCK(stcb); 4770 atomic_subtract_int(&stcb->asoc.refcnt, 1); 4771#endif 4772 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 4773#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4774 SCTP_SOCKET_UNLOCK(so, 1); 4775#endif 4776 } 4777 return (NULL); 4778 } 4779 } 4780 /* The INIT-ACK chunk must be the only chunk. */ 4781 if ((num_chunks > 1) || 4782 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4783 *offset = length; 4784 if (locked_tcb) { 4785 SCTP_TCB_UNLOCK(locked_tcb); 4786 } 4787 return (NULL); 4788 } 4789 if ((netp) && (*netp)) { 4790 ret = sctp_handle_init_ack(m, iphlen, *offset, 4791 src, dst, sh, 4792 (struct sctp_init_ack_chunk *)ch, 4793 stcb, *netp, 4794 &abort_no_unlock, 4795 use_mflowid, mflowid, 4796 vrf_id); 4797 } else { 4798 ret = -1; 4799 } 4800 *offset = length; 4801 if (abort_no_unlock) { 4802 return (NULL); 4803 } 4804 /* 4805 * Special case, I must call the output routine to 4806 * get the cookie echoed 4807 */ 4808 if ((stcb != NULL) && (ret == 0)) { 4809 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 4810 } 4811 if (locked_tcb) { 4812 SCTP_TCB_UNLOCK(locked_tcb); 4813 } 4814 return (NULL); 4815 break; 4816 case SCTP_SELECTIVE_ACK: 4817 { 4818 struct sctp_sack_chunk *sack; 4819 int abort_now = 0; 4820 uint32_t a_rwnd, cum_ack; 4821 uint16_t num_seg, num_dup; 4822 uint8_t flags; 4823 int offset_seg, offset_dup; 4824 4825 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK\n"); 4826 SCTP_STAT_INCR(sctps_recvsacks); 4827 if (stcb == NULL) { 4828 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing SACK chunk\n"); 4829 break; 4830 } 4831 if (chk_length < sizeof(struct sctp_sack_chunk)) { 4832 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n"); 4833 break; 4834 } 4835 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4836 /*- 4837 * If we have sent a shutdown-ack, we will pay no 4838 * attention to a sack sent in to us since 4839 * we don't care anymore. 4840 */ 4841 break; 4842 } 4843 sack = (struct sctp_sack_chunk *)ch; 4844 flags = ch->chunk_flags; 4845 cum_ack = ntohl(sack->sack.cum_tsn_ack); 4846 num_seg = ntohs(sack->sack.num_gap_ack_blks); 4847 num_dup = ntohs(sack->sack.num_dup_tsns); 4848 a_rwnd = (uint32_t) ntohl(sack->sack.a_rwnd); 4849 if (sizeof(struct sctp_sack_chunk) + 4850 num_seg * sizeof(struct sctp_gap_ack_block) + 4851 num_dup * sizeof(uint32_t) != chk_length) { 4852 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n"); 4853 break; 4854 } 4855 offset_seg = *offset + sizeof(struct sctp_sack_chunk); 4856 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 4857 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n", 4858 cum_ack, num_seg, a_rwnd); 4859 stcb->asoc.seen_a_sack_this_pkt = 1; 4860 if ((stcb->asoc.pr_sctp_cnt == 0) && 4861 (num_seg == 0) && 4862 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 4863 (stcb->asoc.saw_sack_with_frags == 0) && 4864 (stcb->asoc.saw_sack_with_nr_frags == 0) && 4865 (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) 4866 ) { 4867 /* 4868 * We have a SIMPLE sack having no 4869 * prior segments and data on sent 4870 * queue to be acked.. Use the 4871 * faster path sack processing. We 4872 * also allow window update sacks 4873 * with no missing segments to go 4874 * this way too. 4875 */ 4876 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, &abort_now, ecne_seen); 4877 } else { 4878 if (netp && *netp) 4879 sctp_handle_sack(m, offset_seg, offset_dup, stcb, 4880 num_seg, 0, num_dup, &abort_now, flags, 4881 cum_ack, a_rwnd, ecne_seen); 4882 } 4883 if (abort_now) { 4884 /* ABORT signal from sack processing */ 4885 *offset = length; 4886 return (NULL); 4887 } 4888 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 4889 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 4890 (stcb->asoc.stream_queue_cnt == 0)) { 4891 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 4892 } 4893 } 4894 break; 4895 /* 4896 * EY - nr_sack: If the received chunk is an 4897 * nr_sack chunk 4898 */ 4899 case SCTP_NR_SELECTIVE_ACK: 4900 { 4901 struct sctp_nr_sack_chunk *nr_sack; 4902 int abort_now = 0; 4903 uint32_t a_rwnd, cum_ack; 4904 uint16_t num_seg, num_nr_seg, num_dup; 4905 uint8_t flags; 4906 int offset_seg, offset_dup; 4907 4908 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK\n"); 4909 SCTP_STAT_INCR(sctps_recvsacks); 4910 if (stcb == NULL) { 4911 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing NR-SACK chunk\n"); 4912 break; 4913 } 4914 if ((stcb->asoc.sctp_nr_sack_on_off == 0) || 4915 (stcb->asoc.peer_supports_nr_sack == 0)) { 4916 goto unknown_chunk; 4917 } 4918 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) { 4919 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR-SACK chunk, too small\n"); 4920 break; 4921 } 4922 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4923 /*- 4924 * If we have sent a shutdown-ack, we will pay no 4925 * attention to a sack sent in to us since 4926 * we don't care anymore. 4927 */ 4928 break; 4929 } 4930 nr_sack = (struct sctp_nr_sack_chunk *)ch; 4931 flags = ch->chunk_flags; 4932 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack); 4933 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks); 4934 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks); 4935 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns); 4936 a_rwnd = (uint32_t) ntohl(nr_sack->nr_sack.a_rwnd); 4937 if (sizeof(struct sctp_nr_sack_chunk) + 4938 (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) + 4939 num_dup * sizeof(uint32_t) != chk_length) { 4940 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n"); 4941 break; 4942 } 4943 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk); 4944 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 4945 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n", 4946 cum_ack, num_seg, a_rwnd); 4947 stcb->asoc.seen_a_sack_this_pkt = 1; 4948 if ((stcb->asoc.pr_sctp_cnt == 0) && 4949 (num_seg == 0) && (num_nr_seg == 0) && 4950 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 4951 (stcb->asoc.saw_sack_with_frags == 0) && 4952 (stcb->asoc.saw_sack_with_nr_frags == 0) && 4953 (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) { 4954 /* 4955 * We have a SIMPLE sack having no 4956 * prior segments and data on sent 4957 * queue to be acked. Use the faster 4958 * path sack processing. We also 4959 * allow window update sacks with no 4960 * missing segments to go this way 4961 * too. 4962 */ 4963 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, 4964 &abort_now, ecne_seen); 4965 } else { 4966 if (netp && *netp) 4967 sctp_handle_sack(m, offset_seg, offset_dup, stcb, 4968 num_seg, num_nr_seg, num_dup, &abort_now, flags, 4969 cum_ack, a_rwnd, ecne_seen); 4970 } 4971 if (abort_now) { 4972 /* ABORT signal from sack processing */ 4973 *offset = length; 4974 return (NULL); 4975 } 4976 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 4977 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 4978 (stcb->asoc.stream_queue_cnt == 0)) { 4979 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 4980 } 4981 } 4982 break; 4983 4984 case SCTP_HEARTBEAT_REQUEST: 4985 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n"); 4986 if ((stcb) && netp && *netp) { 4987 SCTP_STAT_INCR(sctps_recvheartbeat); 4988 sctp_send_heartbeat_ack(stcb, m, *offset, 4989 chk_length, *netp); 4990 4991 /* He's alive so give him credit */ 4992 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4993 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4994 stcb->asoc.overall_error_count, 4995 0, 4996 SCTP_FROM_SCTP_INPUT, 4997 __LINE__); 4998 } 4999 stcb->asoc.overall_error_count = 0; 5000 } 5001 break; 5002 case SCTP_HEARTBEAT_ACK: 5003 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT-ACK\n"); 5004 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) { 5005 /* Its not ours */ 5006 *offset = length; 5007 if (locked_tcb) { 5008 SCTP_TCB_UNLOCK(locked_tcb); 5009 } 5010 return (NULL); 5011 } 5012 /* He's alive so give him credit */ 5013 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5014 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5015 stcb->asoc.overall_error_count, 5016 0, 5017 SCTP_FROM_SCTP_INPUT, 5018 __LINE__); 5019 } 5020 stcb->asoc.overall_error_count = 0; 5021 SCTP_STAT_INCR(sctps_recvheartbeatack); 5022 if (netp && *netp) 5023 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch, 5024 stcb, *netp); 5025 break; 5026 case SCTP_ABORT_ASSOCIATION: 5027 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n", 5028 stcb); 5029 if ((stcb) && netp && *netp) 5030 sctp_handle_abort((struct sctp_abort_chunk *)ch, 5031 stcb, *netp); 5032 *offset = length; 5033 return (NULL); 5034 break; 5035 case SCTP_SHUTDOWN: 5036 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n", 5037 stcb); 5038 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) { 5039 *offset = length; 5040 if (locked_tcb) { 5041 SCTP_TCB_UNLOCK(locked_tcb); 5042 } 5043 return (NULL); 5044 } 5045 if (netp && *netp) { 5046 int abort_flag = 0; 5047 5048 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch, 5049 stcb, *netp, &abort_flag); 5050 if (abort_flag) { 5051 *offset = length; 5052 return (NULL); 5053 } 5054 } 5055 break; 5056 case SCTP_SHUTDOWN_ACK: 5057 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-ACK, stcb %p\n", stcb); 5058 if ((stcb) && (netp) && (*netp)) 5059 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp); 5060 *offset = length; 5061 return (NULL); 5062 break; 5063 5064 case SCTP_OPERATION_ERROR: 5065 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP-ERR\n"); 5066 if ((stcb) && netp && *netp && sctp_handle_error(ch, stcb, *netp) < 0) { 5067 *offset = length; 5068 return (NULL); 5069 } 5070 break; 5071 case SCTP_COOKIE_ECHO: 5072 SCTPDBG(SCTP_DEBUG_INPUT3, 5073 "SCTP_COOKIE-ECHO, stcb %p\n", stcb); 5074 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 5075 ; 5076 } else { 5077 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5078 /* We are not interested anymore */ 5079 abend: 5080 if (stcb) { 5081 SCTP_TCB_UNLOCK(stcb); 5082 } 5083 *offset = length; 5084 return (NULL); 5085 } 5086 } 5087 /* 5088 * First are we accepting? We do this again here 5089 * since it is possible that a previous endpoint WAS 5090 * listening responded to a INIT-ACK and then 5091 * closed. We opened and bound.. and are now no 5092 * longer listening. 5093 */ 5094 5095 if ((stcb == NULL) && (inp->sctp_socket->so_qlen >= inp->sctp_socket->so_qlimit)) { 5096 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 5097 (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) { 5098 struct mbuf *op_err; 5099 5100 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC); 5101 sctp_abort_association(inp, stcb, m, iphlen, 5102 src, dst, sh, op_err, 5103 use_mflowid, mflowid, 5104 vrf_id, port); 5105 } 5106 *offset = length; 5107 return (NULL); 5108 } else { 5109 struct mbuf *ret_buf; 5110 struct sctp_inpcb *linp; 5111 5112 if (stcb) { 5113 linp = NULL; 5114 } else { 5115 linp = inp; 5116 } 5117 5118 if (linp) { 5119 SCTP_ASOC_CREATE_LOCK(linp); 5120 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 5121 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) { 5122 SCTP_ASOC_CREATE_UNLOCK(linp); 5123 goto abend; 5124 } 5125 } 5126 if (netp) { 5127 ret_buf = 5128 sctp_handle_cookie_echo(m, iphlen, 5129 *offset, 5130 src, dst, 5131 sh, 5132 (struct sctp_cookie_echo_chunk *)ch, 5133 &inp, &stcb, netp, 5134 auth_skipped, 5135 auth_offset, 5136 auth_len, 5137 &locked_tcb, 5138 use_mflowid, 5139 mflowid, 5140 vrf_id, 5141 port); 5142 } else { 5143 ret_buf = NULL; 5144 } 5145 if (linp) { 5146 SCTP_ASOC_CREATE_UNLOCK(linp); 5147 } 5148 if (ret_buf == NULL) { 5149 if (locked_tcb) { 5150 SCTP_TCB_UNLOCK(locked_tcb); 5151 } 5152 SCTPDBG(SCTP_DEBUG_INPUT3, 5153 "GAK, null buffer\n"); 5154 *offset = length; 5155 return (NULL); 5156 } 5157 /* if AUTH skipped, see if it verified... */ 5158 if (auth_skipped) { 5159 got_auth = 1; 5160 auth_skipped = 0; 5161 } 5162 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) { 5163 /* 5164 * Restart the timer if we have 5165 * pending data 5166 */ 5167 struct sctp_tmit_chunk *chk; 5168 5169 chk = TAILQ_FIRST(&stcb->asoc.sent_queue); 5170 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 5171 } 5172 } 5173 break; 5174 case SCTP_COOKIE_ACK: 5175 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE-ACK, stcb %p\n", stcb); 5176 if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) { 5177 if (locked_tcb) { 5178 SCTP_TCB_UNLOCK(locked_tcb); 5179 } 5180 return (NULL); 5181 } 5182 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5183 /* We are not interested anymore */ 5184 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 5185 ; 5186 } else if (stcb) { 5187#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5188 so = SCTP_INP_SO(inp); 5189 atomic_add_int(&stcb->asoc.refcnt, 1); 5190 SCTP_TCB_UNLOCK(stcb); 5191 SCTP_SOCKET_LOCK(so, 1); 5192 SCTP_TCB_LOCK(stcb); 5193 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5194#endif 5195 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 5196#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5197 SCTP_SOCKET_UNLOCK(so, 1); 5198#endif 5199 *offset = length; 5200 return (NULL); 5201 } 5202 } 5203 /* He's alive so give him credit */ 5204 if ((stcb) && netp && *netp) { 5205 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5206 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5207 stcb->asoc.overall_error_count, 5208 0, 5209 SCTP_FROM_SCTP_INPUT, 5210 __LINE__); 5211 } 5212 stcb->asoc.overall_error_count = 0; 5213 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp); 5214 } 5215 break; 5216 case SCTP_ECN_ECHO: 5217 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-ECHO\n"); 5218 /* He's alive so give him credit */ 5219 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) { 5220 /* Its not ours */ 5221 if (locked_tcb) { 5222 SCTP_TCB_UNLOCK(locked_tcb); 5223 } 5224 *offset = length; 5225 return (NULL); 5226 } 5227 if (stcb) { 5228 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5229 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5230 stcb->asoc.overall_error_count, 5231 0, 5232 SCTP_FROM_SCTP_INPUT, 5233 __LINE__); 5234 } 5235 stcb->asoc.overall_error_count = 0; 5236 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, 5237 stcb); 5238 ecne_seen = 1; 5239 } 5240 break; 5241 case SCTP_ECN_CWR: 5242 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-CWR\n"); 5243 /* He's alive so give him credit */ 5244 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) { 5245 /* Its not ours */ 5246 if (locked_tcb) { 5247 SCTP_TCB_UNLOCK(locked_tcb); 5248 } 5249 *offset = length; 5250 return (NULL); 5251 } 5252 if (stcb) { 5253 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5254 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5255 stcb->asoc.overall_error_count, 5256 0, 5257 SCTP_FROM_SCTP_INPUT, 5258 __LINE__); 5259 } 5260 stcb->asoc.overall_error_count = 0; 5261 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp); 5262 } 5263 break; 5264 case SCTP_SHUTDOWN_COMPLETE: 5265 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-COMPLETE, stcb %p\n", stcb); 5266 /* must be first and only chunk */ 5267 if ((num_chunks > 1) || 5268 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 5269 *offset = length; 5270 if (locked_tcb) { 5271 SCTP_TCB_UNLOCK(locked_tcb); 5272 } 5273 return (NULL); 5274 } 5275 if ((stcb) && netp && *netp) { 5276 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch, 5277 stcb, *netp); 5278 } 5279 *offset = length; 5280 return (NULL); 5281 break; 5282 case SCTP_ASCONF: 5283 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n"); 5284 /* He's alive so give him credit */ 5285 if (stcb) { 5286 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5287 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5288 stcb->asoc.overall_error_count, 5289 0, 5290 SCTP_FROM_SCTP_INPUT, 5291 __LINE__); 5292 } 5293 stcb->asoc.overall_error_count = 0; 5294 sctp_handle_asconf(m, *offset, src, 5295 (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0); 5296 asconf_cnt++; 5297 } 5298 break; 5299 case SCTP_ASCONF_ACK: 5300 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF-ACK\n"); 5301 if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) { 5302 /* Its not ours */ 5303 if (locked_tcb) { 5304 SCTP_TCB_UNLOCK(locked_tcb); 5305 } 5306 *offset = length; 5307 return (NULL); 5308 } 5309 if ((stcb) && netp && *netp) { 5310 /* He's alive so give him credit */ 5311 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5312 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5313 stcb->asoc.overall_error_count, 5314 0, 5315 SCTP_FROM_SCTP_INPUT, 5316 __LINE__); 5317 } 5318 stcb->asoc.overall_error_count = 0; 5319 sctp_handle_asconf_ack(m, *offset, 5320 (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock); 5321 if (abort_no_unlock) 5322 return (NULL); 5323 } 5324 break; 5325 case SCTP_FORWARD_CUM_TSN: 5326 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD-TSN\n"); 5327 if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) { 5328 /* Its not ours */ 5329 if (locked_tcb) { 5330 SCTP_TCB_UNLOCK(locked_tcb); 5331 } 5332 *offset = length; 5333 return (NULL); 5334 } 5335 /* He's alive so give him credit */ 5336 if (stcb) { 5337 int abort_flag = 0; 5338 5339 stcb->asoc.overall_error_count = 0; 5340 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5341 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5342 stcb->asoc.overall_error_count, 5343 0, 5344 SCTP_FROM_SCTP_INPUT, 5345 __LINE__); 5346 } 5347 *fwd_tsn_seen = 1; 5348 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5349 /* We are not interested anymore */ 5350#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5351 so = SCTP_INP_SO(inp); 5352 atomic_add_int(&stcb->asoc.refcnt, 1); 5353 SCTP_TCB_UNLOCK(stcb); 5354 SCTP_SOCKET_LOCK(so, 1); 5355 SCTP_TCB_LOCK(stcb); 5356 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5357#endif 5358 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_29); 5359#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5360 SCTP_SOCKET_UNLOCK(so, 1); 5361#endif 5362 *offset = length; 5363 return (NULL); 5364 } 5365 sctp_handle_forward_tsn(stcb, 5366 (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset); 5367 if (abort_flag) { 5368 *offset = length; 5369 return (NULL); 5370 } else { 5371 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5372 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5373 stcb->asoc.overall_error_count, 5374 0, 5375 SCTP_FROM_SCTP_INPUT, 5376 __LINE__); 5377 } 5378 stcb->asoc.overall_error_count = 0; 5379 } 5380 5381 } 5382 break; 5383 case SCTP_STREAM_RESET: 5384 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n"); 5385 if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) { 5386 /* Its not ours */ 5387 if (locked_tcb) { 5388 SCTP_TCB_UNLOCK(locked_tcb); 5389 } 5390 *offset = length; 5391 return (NULL); 5392 } 5393 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5394 /* We are not interested anymore */ 5395#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5396 so = SCTP_INP_SO(inp); 5397 atomic_add_int(&stcb->asoc.refcnt, 1); 5398 SCTP_TCB_UNLOCK(stcb); 5399 SCTP_SOCKET_LOCK(so, 1); 5400 SCTP_TCB_LOCK(stcb); 5401 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5402#endif 5403 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_30); 5404#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5405 SCTP_SOCKET_UNLOCK(so, 1); 5406#endif 5407 *offset = length; 5408 return (NULL); 5409 } 5410 if (stcb->asoc.peer_supports_strreset == 0) { 5411 /* 5412 * hmm, peer should have announced this, but 5413 * we will turn it on since he is sending us 5414 * a stream reset. 5415 */ 5416 stcb->asoc.peer_supports_strreset = 1; 5417 } 5418 if (sctp_handle_stream_reset(stcb, m, *offset, (struct sctp_stream_reset_out_req *)ch)) { 5419 /* stop processing */ 5420 *offset = length; 5421 return (NULL); 5422 } 5423 break; 5424 case SCTP_PACKET_DROPPED: 5425 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n"); 5426 /* re-get it all please */ 5427 if (chk_length < sizeof(struct sctp_pktdrop_chunk)) { 5428 /* Its not ours */ 5429 if (locked_tcb) { 5430 SCTP_TCB_UNLOCK(locked_tcb); 5431 } 5432 *offset = length; 5433 return (NULL); 5434 } 5435 if (ch && (stcb) && netp && (*netp)) { 5436 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch, 5437 stcb, *netp, 5438 min(chk_length, (sizeof(chunk_buf) - 4))); 5439 5440 } 5441 break; 5442 5443 case SCTP_AUTHENTICATION: 5444 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n"); 5445 if (SCTP_BASE_SYSCTL(sctp_auth_disable)) 5446 goto unknown_chunk; 5447 5448 if (stcb == NULL) { 5449 /* save the first AUTH for later processing */ 5450 if (auth_skipped == 0) { 5451 auth_offset = *offset; 5452 auth_len = chk_length; 5453 auth_skipped = 1; 5454 } 5455 /* skip this chunk (temporarily) */ 5456 goto next_chunk; 5457 } 5458 if ((chk_length < (sizeof(struct sctp_auth_chunk))) || 5459 (chk_length > (sizeof(struct sctp_auth_chunk) + 5460 SCTP_AUTH_DIGEST_LEN_MAX))) { 5461 /* Its not ours */ 5462 if (locked_tcb) { 5463 SCTP_TCB_UNLOCK(locked_tcb); 5464 } 5465 *offset = length; 5466 return (NULL); 5467 } 5468 if (got_auth == 1) { 5469 /* skip this chunk... it's already auth'd */ 5470 goto next_chunk; 5471 } 5472 got_auth = 1; 5473 if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch, 5474 m, *offset)) { 5475 /* auth HMAC failed so dump the packet */ 5476 *offset = length; 5477 return (stcb); 5478 } else { 5479 /* remaining chunks are HMAC checked */ 5480 stcb->asoc.authenticated = 1; 5481 } 5482 break; 5483 5484 default: 5485 unknown_chunk: 5486 /* it's an unknown chunk! */ 5487 if ((ch->chunk_type & 0x40) && (stcb != NULL)) { 5488 struct mbuf *mm; 5489 struct sctp_paramhdr *phd; 5490 5491 mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 5492 0, M_DONTWAIT, 1, MT_DATA); 5493 if (mm) { 5494 phd = mtod(mm, struct sctp_paramhdr *); 5495 /* 5496 * We cheat and use param type since 5497 * we did not bother to define a 5498 * error cause struct. They are the 5499 * same basic format with different 5500 * names. 5501 */ 5502 phd->param_type = htons(SCTP_CAUSE_UNRECOG_CHUNK); 5503 phd->param_length = htons(chk_length + sizeof(*phd)); 5504 SCTP_BUF_LEN(mm) = sizeof(*phd); 5505 SCTP_BUF_NEXT(mm) = SCTP_M_COPYM(m, *offset, chk_length, M_DONTWAIT); 5506 if (SCTP_BUF_NEXT(mm)) { 5507 if (sctp_pad_lastmbuf(SCTP_BUF_NEXT(mm), SCTP_SIZE32(chk_length) - chk_length, NULL)) { 5508 sctp_m_freem(mm); 5509 } else { 5510#ifdef SCTP_MBUF_LOGGING 5511 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5512 struct mbuf *mat; 5513 5514 for (mat = SCTP_BUF_NEXT(mm); mat; mat = SCTP_BUF_NEXT(mat)) { 5515 if (SCTP_BUF_IS_EXTENDED(mat)) { 5516 sctp_log_mb(mat, SCTP_MBUF_ICOPY); 5517 } 5518 } 5519 } 5520#endif 5521 sctp_queue_op_err(stcb, mm); 5522 } 5523 } else { 5524 sctp_m_freem(mm); 5525 } 5526 } 5527 } 5528 if ((ch->chunk_type & 0x80) == 0) { 5529 /* discard this packet */ 5530 *offset = length; 5531 return (stcb); 5532 } /* else skip this bad chunk and continue... */ 5533 break; 5534 } /* switch (ch->chunk_type) */ 5535 5536 5537next_chunk: 5538 /* get the next chunk */ 5539 *offset += SCTP_SIZE32(chk_length); 5540 if (*offset >= length) { 5541 /* no more data left in the mbuf chain */ 5542 break; 5543 } 5544 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 5545 sizeof(struct sctp_chunkhdr), chunk_buf); 5546 if (ch == NULL) { 5547 if (locked_tcb) { 5548 SCTP_TCB_UNLOCK(locked_tcb); 5549 } 5550 *offset = length; 5551 return (NULL); 5552 } 5553 } /* while */ 5554 5555 if (asconf_cnt > 0 && stcb != NULL) { 5556 sctp_send_asconf_ack(stcb); 5557 } 5558 return (stcb); 5559} 5560 5561 5562#ifdef INVARIANTS 5563#ifdef __GNUC__ 5564__attribute__((noinline)) 5565#endif 5566 void 5567 sctp_validate_no_locks(struct sctp_inpcb *inp) 5568{ 5569 struct sctp_tcb *lstcb; 5570 5571 LIST_FOREACH(lstcb, &inp->sctp_asoc_list, sctp_tcblist) { 5572 if (mtx_owned(&lstcb->tcb_mtx)) { 5573 panic("Own lock on stcb at return from input"); 5574 } 5575 } 5576 if (mtx_owned(&inp->inp_create_mtx)) { 5577 panic("Own create lock on inp"); 5578 } 5579 if (mtx_owned(&inp->inp_mtx)) { 5580 panic("Own inp lock on inp"); 5581 } 5582} 5583 5584#endif 5585 5586/* 5587 * common input chunk processing (v4 and v6) 5588 */ 5589void 5590sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length, 5591 struct sockaddr *src, struct sockaddr *dst, 5592 struct sctphdr *sh, struct sctp_chunkhdr *ch, 5593 struct sctp_inpcb *inp, struct sctp_tcb *stcb, 5594 struct sctp_nets *net, uint8_t ecn_bits, 5595 uint8_t use_mflowid, uint32_t mflowid, 5596 uint32_t vrf_id, uint16_t port) 5597{ 5598 /* 5599 * Control chunk processing 5600 */ 5601 uint32_t high_tsn; 5602 int fwd_tsn_seen = 0, data_processed = 0; 5603 struct mbuf *m = *mm; 5604 int un_sent; 5605 int cnt_ctrl_ready = 0; 5606 5607 SCTP_STAT_INCR(sctps_recvdatagrams); 5608#ifdef SCTP_AUDITING_ENABLED 5609 sctp_audit_log(0xE0, 1); 5610 sctp_auditing(0, inp, stcb, net); 5611#endif 5612 5613 SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n", 5614 m, iphlen, offset, length, stcb); 5615 if (stcb) { 5616 /* always clear this before beginning a packet */ 5617 stcb->asoc.authenticated = 0; 5618 stcb->asoc.seen_a_sack_this_pkt = 0; 5619 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n", 5620 stcb, stcb->asoc.state); 5621 5622 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) || 5623 (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) { 5624 /*- 5625 * If we hit here, we had a ref count 5626 * up when the assoc was aborted and the 5627 * timer is clearing out the assoc, we should 5628 * NOT respond to any packet.. its OOTB. 5629 */ 5630 SCTP_TCB_UNLOCK(stcb); 5631 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, 5632 use_mflowid, mflowid, 5633 vrf_id, port); 5634 goto out_now; 5635 } 5636 } 5637 if (IS_SCTP_CONTROL(ch)) { 5638 /* process the control portion of the SCTP packet */ 5639 /* sa_ignore NO_NULL_CHK */ 5640 stcb = sctp_process_control(m, iphlen, &offset, length, 5641 src, dst, sh, ch, 5642 inp, stcb, &net, &fwd_tsn_seen, 5643 use_mflowid, mflowid, 5644 vrf_id, port); 5645 if (stcb) { 5646 /* 5647 * This covers us if the cookie-echo was there and 5648 * it changes our INP. 5649 */ 5650 inp = stcb->sctp_ep; 5651 if ((net) && (port)) { 5652 if (net->port == 0) { 5653 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr)); 5654 } 5655 net->port = port; 5656 } 5657 } 5658 } else { 5659 /* 5660 * no control chunks, so pre-process DATA chunks (these 5661 * checks are taken care of by control processing) 5662 */ 5663 5664 /* 5665 * if DATA only packet, and auth is required, then punt... 5666 * can't have authenticated without any AUTH (control) 5667 * chunks 5668 */ 5669 if ((stcb != NULL) && 5670 !SCTP_BASE_SYSCTL(sctp_auth_disable) && 5671 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) { 5672 /* "silently" ignore */ 5673 SCTP_STAT_INCR(sctps_recvauthmissing); 5674 SCTP_TCB_UNLOCK(stcb); 5675 goto out_now; 5676 } 5677 if (stcb == NULL) { 5678 /* out of the blue DATA chunk */ 5679 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, 5680 use_mflowid, mflowid, 5681 vrf_id, port); 5682 goto out_now; 5683 } 5684 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) { 5685 /* v_tag mismatch! */ 5686 SCTP_STAT_INCR(sctps_badvtag); 5687 SCTP_TCB_UNLOCK(stcb); 5688 goto out_now; 5689 } 5690 } 5691 5692 if (stcb == NULL) { 5693 /* 5694 * no valid TCB for this packet, or we found it's a bad 5695 * packet while processing control, or we're done with this 5696 * packet (done or skip rest of data), so we drop it... 5697 */ 5698 goto out_now; 5699 } 5700 /* 5701 * DATA chunk processing 5702 */ 5703 /* plow through the data chunks while length > offset */ 5704 5705 /* 5706 * Rest should be DATA only. Check authentication state if AUTH for 5707 * DATA is required. 5708 */ 5709 if ((length > offset) && 5710 (stcb != NULL) && 5711 !SCTP_BASE_SYSCTL(sctp_auth_disable) && 5712 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) && 5713 !stcb->asoc.authenticated) { 5714 /* "silently" ignore */ 5715 SCTP_STAT_INCR(sctps_recvauthmissing); 5716 SCTPDBG(SCTP_DEBUG_AUTH1, 5717 "Data chunk requires AUTH, skipped\n"); 5718 goto trigger_send; 5719 } 5720 if (length > offset) { 5721 int retval; 5722 5723 /* 5724 * First check to make sure our state is correct. We would 5725 * not get here unless we really did have a tag, so we don't 5726 * abort if this happens, just dump the chunk silently. 5727 */ 5728 switch (SCTP_GET_STATE(&stcb->asoc)) { 5729 case SCTP_STATE_COOKIE_ECHOED: 5730 /* 5731 * we consider data with valid tags in this state 5732 * shows us the cookie-ack was lost. Imply it was 5733 * there. 5734 */ 5735 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5736 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5737 stcb->asoc.overall_error_count, 5738 0, 5739 SCTP_FROM_SCTP_INPUT, 5740 __LINE__); 5741 } 5742 stcb->asoc.overall_error_count = 0; 5743 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net); 5744 break; 5745 case SCTP_STATE_COOKIE_WAIT: 5746 /* 5747 * We consider OOTB any data sent during asoc setup. 5748 */ 5749 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, 5750 use_mflowid, mflowid, 5751 vrf_id, port); 5752 SCTP_TCB_UNLOCK(stcb); 5753 goto out_now; 5754 /* sa_ignore NOTREACHED */ 5755 break; 5756 case SCTP_STATE_EMPTY: /* should not happen */ 5757 case SCTP_STATE_INUSE: /* should not happen */ 5758 case SCTP_STATE_SHUTDOWN_RECEIVED: /* This is a peer error */ 5759 case SCTP_STATE_SHUTDOWN_ACK_SENT: 5760 default: 5761 SCTP_TCB_UNLOCK(stcb); 5762 goto out_now; 5763 /* sa_ignore NOTREACHED */ 5764 break; 5765 case SCTP_STATE_OPEN: 5766 case SCTP_STATE_SHUTDOWN_SENT: 5767 break; 5768 } 5769 /* plow through the data chunks while length > offset */ 5770 retval = sctp_process_data(mm, iphlen, &offset, length, 5771 src, dst, sh, 5772 inp, stcb, net, &high_tsn, 5773 use_mflowid, mflowid, 5774 vrf_id, port); 5775 if (retval == 2) { 5776 /* 5777 * The association aborted, NO UNLOCK needed since 5778 * the association is destroyed. 5779 */ 5780 goto out_now; 5781 } 5782 data_processed = 1; 5783 /* 5784 * Anything important needs to have been m_copy'ed in 5785 * process_data 5786 */ 5787 } 5788 /* take care of ecn */ 5789 if ((data_processed == 1) && 5790 (stcb->asoc.ecn_allowed == 1) && 5791 ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) { 5792 /* Yep, we need to add a ECNE */ 5793 sctp_send_ecn_echo(stcb, net, high_tsn); 5794 } 5795 if ((data_processed == 0) && (fwd_tsn_seen)) { 5796 int was_a_gap; 5797 uint32_t highest_tsn; 5798 5799 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) { 5800 highest_tsn = stcb->asoc.highest_tsn_inside_nr_map; 5801 } else { 5802 highest_tsn = stcb->asoc.highest_tsn_inside_map; 5803 } 5804 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn); 5805 stcb->asoc.send_sack = 1; 5806 sctp_sack_check(stcb, was_a_gap); 5807 } else if (fwd_tsn_seen) { 5808 stcb->asoc.send_sack = 1; 5809 } 5810 /* trigger send of any chunks in queue... */ 5811trigger_send: 5812#ifdef SCTP_AUDITING_ENABLED 5813 sctp_audit_log(0xE0, 2); 5814 sctp_auditing(1, inp, stcb, net); 5815#endif 5816 SCTPDBG(SCTP_DEBUG_INPUT1, 5817 "Check for chunk output prw:%d tqe:%d tf=%d\n", 5818 stcb->asoc.peers_rwnd, 5819 TAILQ_EMPTY(&stcb->asoc.control_send_queue), 5820 stcb->asoc.total_flight); 5821 un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight); 5822 if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 5823 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq; 5824 } 5825 if (cnt_ctrl_ready || 5826 ((un_sent) && 5827 (stcb->asoc.peers_rwnd > 0 || 5828 (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) { 5829 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n"); 5830 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 5831 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n"); 5832 } 5833#ifdef SCTP_AUDITING_ENABLED 5834 sctp_audit_log(0xE0, 3); 5835 sctp_auditing(2, inp, stcb, net); 5836#endif 5837 SCTP_TCB_UNLOCK(stcb); 5838out_now: 5839#ifdef INVARIANTS 5840 sctp_validate_no_locks(inp); 5841#endif 5842 return; 5843} 5844 5845#if 0 5846static void 5847sctp_print_mbuf_chain(struct mbuf *m) 5848{ 5849 for (; m; m = SCTP_BUF_NEXT(m)) { 5850 SCTP_PRINTF("%p: m_len = %ld\n", m, SCTP_BUF_LEN(m)); 5851 if (SCTP_BUF_IS_EXTENDED(m)) 5852 SCTP_PRINTF("%p: extend_size = %d\n", m, SCTP_BUF_EXTEND_SIZE(m)); 5853 } 5854} 5855 5856#endif 5857 5858#ifdef INET 5859void 5860sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port) 5861{ 5862 struct mbuf *m; 5863 int iphlen; 5864 uint32_t vrf_id = 0; 5865 uint8_t ecn_bits; 5866 struct sockaddr_in src, dst; 5867 struct ip *ip; 5868 struct sctphdr *sh; 5869 struct sctp_chunkhdr *ch; 5870 struct sctp_inpcb *inp = NULL; 5871 struct sctp_tcb *stcb = NULL; 5872 struct sctp_nets *net = NULL; 5873 int refcount_up = 0; 5874 int length, offset; 5875 uint32_t mflowid; 5876 uint8_t use_mflowid; 5877 5878#if !defined(SCTP_WITH_NO_CSUM) 5879 uint32_t check, calc_check; 5880 5881#endif 5882 5883 iphlen = off; 5884 if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) { 5885 SCTP_RELEASE_PKT(i_pak); 5886 return; 5887 } 5888 m = SCTP_HEADER_TO_CHAIN(i_pak); 5889#ifdef SCTP_MBUF_LOGGING 5890 /* Log in any input mbufs */ 5891 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5892 struct mbuf *mat; 5893 5894 for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) { 5895 if (SCTP_BUF_IS_EXTENDED(mat)) { 5896 sctp_log_mb(mat, SCTP_MBUF_INPUT); 5897 } 5898 } 5899 } 5900#endif 5901#ifdef SCTP_PACKET_LOGGING 5902 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) { 5903 sctp_packet_log(m); 5904 } 5905#endif 5906 if (m->m_flags & M_FLOWID) { 5907 mflowid = m->m_pkthdr.flowid; 5908 use_mflowid = 1; 5909 } else { 5910 mflowid = 0; 5911 use_mflowid = 0; 5912 } 5913 SCTP_STAT_INCR(sctps_recvpackets); 5914 SCTP_STAT_INCR_COUNTER64(sctps_inpackets); 5915 /* Get IP, SCTP, and first chunk header together in the first mbuf. */ 5916 offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr); 5917 if (SCTP_BUF_LEN(m) < offset) { 5918 if ((m = m_pullup(m, offset)) == NULL) { 5919 SCTP_STAT_INCR(sctps_hdrops); 5920 return; 5921 } 5922 } 5923 ip = mtod(m, struct ip *); 5924 sh = (struct sctphdr *)((caddr_t)ip + iphlen); 5925 ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr)); 5926 offset -= sizeof(struct sctp_chunkhdr); 5927 memset(&src, 0, sizeof(struct sockaddr_in)); 5928 src.sin_family = AF_INET; 5929 src.sin_len = sizeof(struct sockaddr_in); 5930 src.sin_port = sh->src_port; 5931 src.sin_addr = ip->ip_src; 5932 memset(&dst, 0, sizeof(struct sockaddr_in)); 5933 dst.sin_family = AF_INET; 5934 dst.sin_len = sizeof(struct sockaddr_in); 5935 dst.sin_port = sh->dest_port; 5936 dst.sin_addr = ip->ip_dst; 5937 length = ip->ip_len + iphlen; 5938 /* Validate mbuf chain length with IP payload length. */ 5939 if (SCTP_HEADER_LEN(i_pak) != length) { 5940 SCTPDBG(SCTP_DEBUG_INPUT1, 5941 "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(i_pak)); 5942 SCTP_STAT_INCR(sctps_hdrops); 5943 goto bad; 5944 } 5945 /* SCTP does not allow broadcasts or multicasts */ 5946 if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) { 5947 goto bad; 5948 } 5949 if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) { 5950 goto bad; 5951 } 5952 SCTPDBG(SCTP_DEBUG_INPUT1, 5953 "sctp_input() length:%d iphlen:%d\n", length, iphlen); 5954 SCTPDBG(SCTP_DEBUG_CRCOFFLOAD, 5955 "sctp_input(): Packet of length %d received on %s with csum_flags 0x%x.\n", 5956 m->m_pkthdr.len, 5957 if_name(m->m_pkthdr.rcvif), 5958 m->m_pkthdr.csum_flags); 5959#if defined(SCTP_WITH_NO_CSUM) 5960 SCTP_STAT_INCR(sctps_recvnocrc); 5961#else 5962 if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) { 5963 SCTP_STAT_INCR(sctps_recvhwcrc); 5964 goto sctp_skip_csum; 5965 } 5966 check = sh->checksum; 5967 sh->checksum = 0; 5968 calc_check = sctp_calculate_cksum(m, iphlen); 5969 sh->checksum = check; 5970 SCTP_STAT_INCR(sctps_recvswcrc); 5971 if (calc_check != check) { 5972 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x m:%p mlen:%d iphlen:%d\n", 5973 calc_check, check, m, length, iphlen); 5974 stcb = sctp_findassociation_addr(m, offset, 5975 (struct sockaddr *)&src, 5976 (struct sockaddr *)&dst, 5977 sh, ch, &inp, &net, vrf_id); 5978 if ((net) && (port)) { 5979 if (net->port == 0) { 5980 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr)); 5981 } 5982 net->port = port; 5983 } 5984 if ((net != NULL) && (use_mflowid != 0)) { 5985 net->flowid = mflowid; 5986#ifdef INVARIANTS 5987 net->flowidset = 1; 5988#endif 5989 } 5990 if ((inp) && (stcb)) { 5991 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1); 5992 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED); 5993 } else if ((inp != NULL) && (stcb == NULL)) { 5994 refcount_up = 1; 5995 } 5996 SCTP_STAT_INCR(sctps_badsum); 5997 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors); 5998 goto bad; 5999 } 6000sctp_skip_csum: 6001#endif 6002 /* destination port of 0 is illegal, based on RFC2960. */ 6003 if (sh->dest_port == 0) { 6004 SCTP_STAT_INCR(sctps_hdrops); 6005 goto bad; 6006 } 6007 stcb = sctp_findassociation_addr(m, offset, 6008 (struct sockaddr *)&src, 6009 (struct sockaddr *)&dst, 6010 sh, ch, &inp, &net, vrf_id); 6011 if ((net) && (port)) { 6012 if (net->port == 0) { 6013 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr)); 6014 } 6015 net->port = port; 6016 } 6017 if ((net != NULL) && (use_mflowid != 0)) { 6018 net->flowid = mflowid; 6019#ifdef INVARIANTS 6020 net->flowidset = 1; 6021#endif 6022 } 6023 if (inp == NULL) { 6024 SCTP_STAT_INCR(sctps_noport); 6025 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) 6026 goto bad; 6027 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 6028 sctp_send_shutdown_complete2((struct sockaddr *)&src, 6029 (struct sockaddr *)&dst, 6030 sh, 6031 use_mflowid, mflowid, 6032 vrf_id, port); 6033 goto bad; 6034 } 6035 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) { 6036 goto bad; 6037 } 6038 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) { 6039 if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) || 6040 ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) && 6041 (ch->chunk_type != SCTP_INIT))) { 6042 sctp_send_abort(m, iphlen, 6043 (struct sockaddr *)&src, 6044 (struct sockaddr *)&dst, 6045 sh, 0, NULL, 6046 use_mflowid, mflowid, 6047 vrf_id, port); 6048 } 6049 } 6050 goto bad; 6051 } else if (stcb == NULL) { 6052 refcount_up = 1; 6053 } 6054#ifdef IPSEC 6055 /*- 6056 * I very much doubt any of the IPSEC stuff will work but I have no 6057 * idea, so I will leave it in place. 6058 */ 6059 if (inp && ipsec4_in_reject(m, &inp->ip_inp.inp)) { 6060 MODULE_GLOBAL(ipsec4stat).in_polvio++; 6061 SCTP_STAT_INCR(sctps_hdrops); 6062 goto bad; 6063 } 6064#endif 6065 6066 ecn_bits = ip->ip_tos; 6067 /* sa_ignore NO_NULL_CHK */ 6068 sctp_common_input_processing(&m, iphlen, offset, length, 6069 (struct sockaddr *)&src, 6070 (struct sockaddr *)&dst, 6071 sh, ch, inp, stcb, net, ecn_bits, 6072 use_mflowid, mflowid, 6073 vrf_id, port); 6074 if (m) { 6075 sctp_m_freem(m); 6076 } 6077 if ((inp) && (refcount_up)) { 6078 /* reduce ref-count */ 6079 SCTP_INP_WLOCK(inp); 6080 SCTP_INP_DECR_REF(inp); 6081 SCTP_INP_WUNLOCK(inp); 6082 } 6083 return; 6084bad: 6085 if (stcb) { 6086 SCTP_TCB_UNLOCK(stcb); 6087 } 6088 if ((inp) && (refcount_up)) { 6089 /* reduce ref-count */ 6090 SCTP_INP_WLOCK(inp); 6091 SCTP_INP_DECR_REF(inp); 6092 SCTP_INP_WUNLOCK(inp); 6093 } 6094 if (m) { 6095 sctp_m_freem(m); 6096 } 6097 return; 6098} 6099 6100#if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP) 6101extern int *sctp_cpuarry; 6102 6103#endif 6104 6105void 6106sctp_input(struct mbuf *m, int off) 6107{ 6108#if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP) 6109 struct ip *ip; 6110 struct sctphdr *sh; 6111 int offset; 6112 int cpu_to_use; 6113 uint32_t flowid, tag; 6114 6115 if (mp_ncpus > 1) { 6116 if (m->m_flags & M_FLOWID) { 6117 flowid = m->m_pkthdr.flowid; 6118 } else { 6119 /* 6120 * No flow id built by lower layers fix it so we 6121 * create one. 6122 */ 6123 offset = off + sizeof(struct sctphdr); 6124 if (SCTP_BUF_LEN(m) < offset) { 6125 if ((m = m_pullup(m, offset)) == NULL) { 6126 SCTP_STAT_INCR(sctps_hdrops); 6127 return; 6128 } 6129 } 6130 ip = mtod(m, struct ip *); 6131 sh = (struct sctphdr *)((caddr_t)ip + off); 6132 tag = htonl(sh->v_tag); 6133 flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port); 6134 m->m_pkthdr.flowid = flowid; 6135 m->m_flags |= M_FLOWID; 6136 } 6137 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus]; 6138 sctp_queue_to_mcore(m, off, cpu_to_use); 6139 return; 6140 } 6141#endif 6142 sctp_input_with_port(m, off, 0); 6143} 6144 6145#endif 6146