sctp_input.c revision 270363
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: stable/10/sys/netinet/sctp_input.c 270363 2014-08-22 20:26:20Z 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#if defined(INET) || defined(INET6) 51#include <netinet/udp.h> 52#endif 53#include <sys/smp.h> 54 55 56 57static void 58sctp_stop_all_cookie_timers(struct sctp_tcb *stcb) 59{ 60 struct sctp_nets *net; 61 62 /* 63 * This now not only stops all cookie timers it also stops any INIT 64 * timers as well. This will make sure that the timers are stopped 65 * in all collision cases. 66 */ 67 SCTP_TCB_LOCK_ASSERT(stcb); 68 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 69 if (net->rxt_timer.type == SCTP_TIMER_TYPE_COOKIE) { 70 sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE, 71 stcb->sctp_ep, 72 stcb, 73 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_1); 74 } else if (net->rxt_timer.type == SCTP_TIMER_TYPE_INIT) { 75 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, 76 stcb->sctp_ep, 77 stcb, 78 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_2); 79 } 80 } 81} 82 83/* INIT handler */ 84static void 85sctp_handle_init(struct mbuf *m, int iphlen, int offset, 86 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 87 struct sctp_init_chunk *cp, struct sctp_inpcb *inp, 88 struct sctp_tcb *stcb, int *abort_no_unlock, 89 uint8_t use_mflowid, uint32_t mflowid, 90 uint32_t vrf_id, uint16_t port) 91{ 92 struct sctp_init *init; 93 struct mbuf *op_err; 94 95 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_init: handling INIT tcb:%p\n", 96 (void *)stcb); 97 if (stcb == NULL) { 98 SCTP_INP_RLOCK(inp); 99 } 100 /* validate length */ 101 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_chunk)) { 102 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 103 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 104 use_mflowid, mflowid, 105 vrf_id, port); 106 if (stcb) 107 *abort_no_unlock = 1; 108 goto outnow; 109 } 110 /* validate parameters */ 111 init = &cp->init; 112 if (init->initiate_tag == 0) { 113 /* protocol error... send abort */ 114 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 115 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 116 use_mflowid, mflowid, 117 vrf_id, port); 118 if (stcb) 119 *abort_no_unlock = 1; 120 goto outnow; 121 } 122 if (ntohl(init->a_rwnd) < SCTP_MIN_RWND) { 123 /* invalid parameter... send abort */ 124 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 125 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 126 use_mflowid, mflowid, 127 vrf_id, port); 128 if (stcb) 129 *abort_no_unlock = 1; 130 goto outnow; 131 } 132 if (init->num_inbound_streams == 0) { 133 /* protocol error... send abort */ 134 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 135 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 136 use_mflowid, mflowid, 137 vrf_id, port); 138 if (stcb) 139 *abort_no_unlock = 1; 140 goto outnow; 141 } 142 if (init->num_outbound_streams == 0) { 143 /* protocol error... send abort */ 144 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 145 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 146 use_mflowid, mflowid, 147 vrf_id, port); 148 if (stcb) 149 *abort_no_unlock = 1; 150 goto outnow; 151 } 152 if (sctp_validate_init_auth_params(m, offset + sizeof(*cp), 153 offset + ntohs(cp->ch.chunk_length))) { 154 /* auth parameter(s) error... send abort */ 155 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 156 "Problem with AUTH parameters"); 157 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 158 use_mflowid, mflowid, 159 vrf_id, port); 160 if (stcb) 161 *abort_no_unlock = 1; 162 goto outnow; 163 } 164 /* 165 * We are only accepting if we have a socket with positive 166 * so_qlimit. 167 */ 168 if ((stcb == NULL) && 169 ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 170 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) || 171 (inp->sctp_socket == NULL) || 172 (inp->sctp_socket->so_qlimit == 0))) { 173 /* 174 * FIX ME ?? What about TCP model and we have a 175 * match/restart case? Actually no fix is needed. the lookup 176 * will always find the existing assoc so stcb would not be 177 * NULL. It may be questionable to do this since we COULD 178 * just send back the INIT-ACK and hope that the app did 179 * accept()'s by the time the COOKIE was sent. But there is 180 * a price to pay for COOKIE generation and I don't want to 181 * pay it on the chance that the app will actually do some 182 * accepts(). The App just looses and should NOT be in this 183 * state :-) 184 */ 185 if (SCTP_BASE_SYSCTL(sctp_blackhole) == 0) { 186 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 187 "No listener"); 188 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err, 189 use_mflowid, mflowid, 190 vrf_id, port); 191 } 192 goto outnow; 193 } 194 if ((stcb != NULL) && 195 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT)) { 196 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending SHUTDOWN-ACK\n"); 197 sctp_send_shutdown_ack(stcb, NULL); 198 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 199 } else { 200 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n"); 201 sctp_send_initiate_ack(inp, stcb, m, iphlen, offset, src, dst, 202 sh, cp, 203 use_mflowid, mflowid, 204 vrf_id, port, 205 ((stcb == NULL) ? SCTP_HOLDS_LOCK : SCTP_NOT_LOCKED)); 206 } 207outnow: 208 if (stcb == NULL) { 209 SCTP_INP_RUNLOCK(inp); 210 } 211} 212 213/* 214 * process peer "INIT/INIT-ACK" chunk returns value < 0 on error 215 */ 216 217int 218sctp_is_there_unsent_data(struct sctp_tcb *stcb, int so_locked 219#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING) 220 SCTP_UNUSED 221#endif 222) 223{ 224 int unsent_data = 0; 225 unsigned int i; 226 struct sctp_stream_queue_pending *sp; 227 struct sctp_association *asoc; 228 229 /* 230 * This function returns the number of streams that have true unsent 231 * data on them. Note that as it looks through it will clean up any 232 * places that have old data that has been sent but left at top of 233 * stream queue. 234 */ 235 asoc = &stcb->asoc; 236 SCTP_TCB_SEND_LOCK(stcb); 237 if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 238 /* Check to see if some data queued */ 239 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 240 /* sa_ignore FREED_MEMORY */ 241 sp = TAILQ_FIRST(&stcb->asoc.strmout[i].outqueue); 242 if (sp == NULL) { 243 continue; 244 } 245 if ((sp->msg_is_complete) && 246 (sp->length == 0) && 247 (sp->sender_all_done)) { 248 /* 249 * We are doing differed cleanup. Last time 250 * through when we took all the data the 251 * sender_all_done was not set. 252 */ 253 if (sp->put_last_out == 0) { 254 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n"); 255 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n", 256 sp->sender_all_done, 257 sp->length, 258 sp->msg_is_complete, 259 sp->put_last_out); 260 } 261 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1); 262 TAILQ_REMOVE(&stcb->asoc.strmout[i].outqueue, sp, next); 263 if (sp->net) { 264 sctp_free_remote_addr(sp->net); 265 sp->net = NULL; 266 } 267 if (sp->data) { 268 sctp_m_freem(sp->data); 269 sp->data = NULL; 270 } 271 sctp_free_a_strmoq(stcb, sp, so_locked); 272 } else { 273 unsent_data++; 274 break; 275 } 276 } 277 } 278 SCTP_TCB_SEND_UNLOCK(stcb); 279 return (unsent_data); 280} 281 282static int 283sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb) 284{ 285 struct sctp_init *init; 286 struct sctp_association *asoc; 287 struct sctp_nets *lnet; 288 unsigned int i; 289 290 init = &cp->init; 291 asoc = &stcb->asoc; 292 /* save off parameters */ 293 asoc->peer_vtag = ntohl(init->initiate_tag); 294 asoc->peers_rwnd = ntohl(init->a_rwnd); 295 /* init tsn's */ 296 asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1; 297 298 if (!TAILQ_EMPTY(&asoc->nets)) { 299 /* update any ssthresh's that may have a default */ 300 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) { 301 lnet->ssthresh = asoc->peers_rwnd; 302 if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) { 303 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION); 304 } 305 } 306 } 307 SCTP_TCB_SEND_LOCK(stcb); 308 if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) { 309 unsigned int newcnt; 310 struct sctp_stream_out *outs; 311 struct sctp_stream_queue_pending *sp, *nsp; 312 struct sctp_tmit_chunk *chk, *nchk; 313 314 /* abandon the upper streams */ 315 newcnt = ntohs(init->num_inbound_streams); 316 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) { 317 if (chk->rec.data.stream_number >= newcnt) { 318 TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next); 319 asoc->send_queue_cnt--; 320 if (asoc->strmout[chk->rec.data.stream_number].chunks_on_queues > 0) { 321 asoc->strmout[chk->rec.data.stream_number].chunks_on_queues--; 322#ifdef INVARIANTS 323 } else { 324 panic("No chunks on the queues for sid %u.", chk->rec.data.stream_number); 325#endif 326 } 327 if (chk->data != NULL) { 328 sctp_free_bufspace(stcb, asoc, chk, 1); 329 sctp_ulp_notify(SCTP_NOTIFY_UNSENT_DG_FAIL, stcb, 330 0, chk, SCTP_SO_NOT_LOCKED); 331 if (chk->data) { 332 sctp_m_freem(chk->data); 333 chk->data = NULL; 334 } 335 } 336 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 337 /* sa_ignore FREED_MEMORY */ 338 } 339 } 340 if (asoc->strmout) { 341 for (i = newcnt; i < asoc->pre_open_streams; i++) { 342 outs = &asoc->strmout[i]; 343 TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) { 344 TAILQ_REMOVE(&outs->outqueue, sp, next); 345 asoc->stream_queue_cnt--; 346 sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL, 347 stcb, 0, sp, SCTP_SO_NOT_LOCKED); 348 if (sp->data) { 349 sctp_m_freem(sp->data); 350 sp->data = NULL; 351 } 352 if (sp->net) { 353 sctp_free_remote_addr(sp->net); 354 sp->net = NULL; 355 } 356 /* Free the chunk */ 357 sctp_free_a_strmoq(stcb, sp, SCTP_SO_NOT_LOCKED); 358 /* sa_ignore FREED_MEMORY */ 359 } 360 } 361 } 362 /* cut back the count */ 363 asoc->pre_open_streams = newcnt; 364 } 365 SCTP_TCB_SEND_UNLOCK(stcb); 366 asoc->strm_realoutsize = asoc->streamoutcnt = asoc->pre_open_streams; 367 368 /* EY - nr_sack: initialize highest tsn in nr_mapping_array */ 369 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 370 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 371 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 372 } 373 /* This is the next one we expect */ 374 asoc->str_reset_seq_in = asoc->asconf_seq_in + 1; 375 376 asoc->mapping_array_base_tsn = ntohl(init->initial_tsn); 377 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in; 378 379 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 380 /* open the requested streams */ 381 382 if (asoc->strmin != NULL) { 383 /* Free the old ones */ 384 struct sctp_queued_to_read *ctl, *nctl; 385 386 for (i = 0; i < asoc->streamincnt; i++) { 387 TAILQ_FOREACH_SAFE(ctl, &asoc->strmin[i].inqueue, next, nctl) { 388 TAILQ_REMOVE(&asoc->strmin[i].inqueue, ctl, next); 389 sctp_free_remote_addr(ctl->whoFrom); 390 ctl->whoFrom = NULL; 391 sctp_m_freem(ctl->data); 392 ctl->data = NULL; 393 sctp_free_a_readq(stcb, ctl); 394 } 395 } 396 SCTP_FREE(asoc->strmin, SCTP_M_STRMI); 397 } 398 if (asoc->max_inbound_streams > ntohs(init->num_outbound_streams)) { 399 asoc->streamincnt = ntohs(init->num_outbound_streams); 400 } else { 401 asoc->streamincnt = asoc->max_inbound_streams; 402 } 403 SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt * 404 sizeof(struct sctp_stream_in), SCTP_M_STRMI); 405 if (asoc->strmin == NULL) { 406 /* we didn't get memory for the streams! */ 407 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n"); 408 return (-1); 409 } 410 for (i = 0; i < asoc->streamincnt; i++) { 411 asoc->strmin[i].stream_no = i; 412 asoc->strmin[i].last_sequence_delivered = 0xffff; 413 TAILQ_INIT(&asoc->strmin[i].inqueue); 414 asoc->strmin[i].delivery_started = 0; 415 } 416 /* 417 * load_address_from_init will put the addresses into the 418 * association when the COOKIE is processed or the INIT-ACK is 419 * processed. Both types of COOKIE's existing and new call this 420 * routine. It will remove addresses that are no longer in the 421 * association (for the restarting case where addresses are 422 * removed). Up front when the INIT arrives we will discard it if it 423 * is a restart and new addresses have been added. 424 */ 425 /* sa_ignore MEMLEAK */ 426 return (0); 427} 428 429/* 430 * INIT-ACK message processing/consumption returns value < 0 on error 431 */ 432static int 433sctp_process_init_ack(struct mbuf *m, int iphlen, int offset, 434 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 435 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 436 struct sctp_nets *net, int *abort_no_unlock, 437 uint8_t use_mflowid, uint32_t mflowid, 438 uint32_t vrf_id) 439{ 440 struct sctp_association *asoc; 441 struct mbuf *op_err; 442 int retval, abort_flag; 443 uint32_t initack_limit; 444 int nat_friendly = 0; 445 446 /* First verify that we have no illegal param's */ 447 abort_flag = 0; 448 449 op_err = sctp_arethere_unrecognized_parameters(m, 450 (offset + sizeof(struct sctp_init_chunk)), 451 &abort_flag, (struct sctp_chunkhdr *)cp, &nat_friendly); 452 if (abort_flag) { 453 /* Send an abort and notify peer */ 454 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 455 *abort_no_unlock = 1; 456 return (-1); 457 } 458 asoc = &stcb->asoc; 459 asoc->peer_supports_nat = (uint8_t) nat_friendly; 460 /* process the peer's parameters in the INIT-ACK */ 461 retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb); 462 if (retval < 0) { 463 return (retval); 464 } 465 initack_limit = offset + ntohs(cp->ch.chunk_length); 466 /* load all addresses */ 467 if ((retval = sctp_load_addresses_from_init(stcb, m, 468 (offset + sizeof(struct sctp_init_chunk)), initack_limit, 469 src, dst, NULL))) { 470 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 471 "Problem with address parameters"); 472 SCTPDBG(SCTP_DEBUG_INPUT1, 473 "Load addresses from INIT causes an abort %d\n", 474 retval); 475 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 476 src, dst, sh, op_err, 477 use_mflowid, mflowid, 478 vrf_id, net->port); 479 *abort_no_unlock = 1; 480 return (-1); 481 } 482 /* if the peer doesn't support asconf, flush the asconf queue */ 483 if (asoc->asconf_supported == 0) { 484 struct sctp_asconf_addr *param, *nparam; 485 486 TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) { 487 TAILQ_REMOVE(&asoc->asconf_queue, param, next); 488 SCTP_FREE(param, SCTP_M_ASC_ADDR); 489 } 490 } 491 stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs, 492 stcb->asoc.local_hmacs); 493 if (op_err) { 494 sctp_queue_op_err(stcb, op_err); 495 /* queuing will steal away the mbuf chain to the out queue */ 496 op_err = NULL; 497 } 498 /* extract the cookie and queue it to "echo" it back... */ 499 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 500 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 501 stcb->asoc.overall_error_count, 502 0, 503 SCTP_FROM_SCTP_INPUT, 504 __LINE__); 505 } 506 stcb->asoc.overall_error_count = 0; 507 net->error_count = 0; 508 509 /* 510 * Cancel the INIT timer, We do this first before queueing the 511 * cookie. We always cancel at the primary to assue that we are 512 * canceling the timer started by the INIT which always goes to the 513 * primary. 514 */ 515 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb, 516 asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4); 517 518 /* calculate the RTO */ 519 net->RTO = sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, sctp_align_safe_nocopy, 520 SCTP_RTT_FROM_NON_DATA); 521 522 retval = sctp_send_cookie_echo(m, offset, stcb, net); 523 if (retval < 0) { 524 /* 525 * No cookie, we probably should send a op error. But in any 526 * case if there is no cookie in the INIT-ACK, we can 527 * abandon the peer, its broke. 528 */ 529 if (retval == -3) { 530 /* We abort with an error of missing mandatory param */ 531 op_err = sctp_generate_cause(SCTP_CAUSE_MISSING_PARAM, ""); 532 if (op_err) { 533 /* 534 * Expand beyond to include the mandatory 535 * param cookie 536 */ 537 struct sctp_inv_mandatory_param *mp; 538 539 SCTP_BUF_LEN(op_err) = 540 sizeof(struct sctp_inv_mandatory_param); 541 mp = mtod(op_err, 542 struct sctp_inv_mandatory_param *); 543 /* Subtract the reserved param */ 544 mp->length = 545 htons(sizeof(struct sctp_inv_mandatory_param) - 2); 546 mp->num_param = htonl(1); 547 mp->param = htons(SCTP_STATE_COOKIE); 548 mp->resv = 0; 549 } 550 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 551 src, dst, sh, op_err, 552 use_mflowid, mflowid, 553 vrf_id, net->port); 554 *abort_no_unlock = 1; 555 } 556 return (retval); 557 } 558 return (0); 559} 560 561static void 562sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp, 563 struct sctp_tcb *stcb, struct sctp_nets *net) 564{ 565 struct sockaddr_storage store; 566 struct sctp_nets *r_net, *f_net; 567 struct timeval tv; 568 int req_prim = 0; 569 uint16_t old_error_counter; 570 571#ifdef INET 572 struct sockaddr_in *sin; 573 574#endif 575#ifdef INET6 576 struct sockaddr_in6 *sin6; 577 578#endif 579 580 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) { 581 /* Invalid length */ 582 return; 583 } 584 memset(&store, 0, sizeof(store)); 585 switch (cp->heartbeat.hb_info.addr_family) { 586#ifdef INET 587 case AF_INET: 588 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) { 589 sin = (struct sockaddr_in *)&store; 590 sin->sin_family = cp->heartbeat.hb_info.addr_family; 591 sin->sin_len = cp->heartbeat.hb_info.addr_len; 592 sin->sin_port = stcb->rport; 593 memcpy(&sin->sin_addr, cp->heartbeat.hb_info.address, 594 sizeof(sin->sin_addr)); 595 } else { 596 return; 597 } 598 break; 599#endif 600#ifdef INET6 601 case AF_INET6: 602 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) { 603 sin6 = (struct sockaddr_in6 *)&store; 604 sin6->sin6_family = cp->heartbeat.hb_info.addr_family; 605 sin6->sin6_len = cp->heartbeat.hb_info.addr_len; 606 sin6->sin6_port = stcb->rport; 607 memcpy(&sin6->sin6_addr, cp->heartbeat.hb_info.address, 608 sizeof(sin6->sin6_addr)); 609 } else { 610 return; 611 } 612 break; 613#endif 614 default: 615 return; 616 } 617 r_net = sctp_findnet(stcb, (struct sockaddr *)&store); 618 if (r_net == NULL) { 619 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n"); 620 return; 621 } 622 if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) && 623 (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) && 624 (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) { 625 /* 626 * If the its a HB and it's random value is correct when can 627 * confirm the destination. 628 */ 629 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 630 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) { 631 stcb->asoc.primary_destination = r_net; 632 r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY; 633 f_net = TAILQ_FIRST(&stcb->asoc.nets); 634 if (f_net != r_net) { 635 /* 636 * first one on the list is NOT the primary 637 * sctp_cmpaddr() is much more efficent if 638 * the primary is the first on the list, 639 * make it so. 640 */ 641 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next); 642 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next); 643 } 644 req_prim = 1; 645 } 646 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 647 stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 648 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3); 649 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 650 } 651 old_error_counter = r_net->error_count; 652 r_net->error_count = 0; 653 r_net->hb_responded = 1; 654 tv.tv_sec = cp->heartbeat.hb_info.time_value_1; 655 tv.tv_usec = cp->heartbeat.hb_info.time_value_2; 656 /* Now lets do a RTO with this */ 657 r_net->RTO = sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, sctp_align_safe_nocopy, 658 SCTP_RTT_FROM_NON_DATA); 659 if (!(r_net->dest_state & SCTP_ADDR_REACHABLE)) { 660 r_net->dest_state |= SCTP_ADDR_REACHABLE; 661 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb, 662 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 663 } 664 if (r_net->dest_state & SCTP_ADDR_PF) { 665 r_net->dest_state &= ~SCTP_ADDR_PF; 666 stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net); 667 } 668 if (old_error_counter > 0) { 669 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3); 670 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 671 } 672 if (r_net == stcb->asoc.primary_destination) { 673 if (stcb->asoc.alternate) { 674 /* release the alternate, primary is good */ 675 sctp_free_remote_addr(stcb->asoc.alternate); 676 stcb->asoc.alternate = NULL; 677 } 678 } 679 /* Mobility adaptation */ 680 if (req_prim) { 681 if ((sctp_is_mobility_feature_on(stcb->sctp_ep, 682 SCTP_MOBILITY_BASE) || 683 sctp_is_mobility_feature_on(stcb->sctp_ep, 684 SCTP_MOBILITY_FASTHANDOFF)) && 685 sctp_is_mobility_feature_on(stcb->sctp_ep, 686 SCTP_MOBILITY_PRIM_DELETED)) { 687 688 sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED, stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_TIMER + SCTP_LOC_7); 689 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 690 SCTP_MOBILITY_FASTHANDOFF)) { 691 sctp_assoc_immediate_retrans(stcb, 692 stcb->asoc.primary_destination); 693 } 694 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 695 SCTP_MOBILITY_BASE)) { 696 sctp_move_chunks_from_net(stcb, 697 stcb->asoc.deleted_primary); 698 } 699 sctp_delete_prim_timer(stcb->sctp_ep, stcb, 700 stcb->asoc.deleted_primary); 701 } 702 } 703} 704 705static int 706sctp_handle_nat_colliding_state(struct sctp_tcb *stcb) 707{ 708 /* 709 * return 0 means we want you to proceed with the abort non-zero 710 * means no abort processing 711 */ 712 struct sctpasochead *head; 713 714 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_WAIT) { 715 /* generate a new vtag and send init */ 716 LIST_REMOVE(stcb, sctp_asocs); 717 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 718 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 719 /* 720 * put it in the bucket in the vtag hash of assoc's for the 721 * system 722 */ 723 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 724 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 725 return (1); 726 } 727 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) { 728 /* 729 * treat like a case where the cookie expired i.e.: - dump 730 * current cookie. - generate a new vtag. - resend init. 731 */ 732 /* generate a new vtag and send init */ 733 LIST_REMOVE(stcb, sctp_asocs); 734 stcb->asoc.state &= ~SCTP_STATE_COOKIE_ECHOED; 735 stcb->asoc.state |= SCTP_STATE_COOKIE_WAIT; 736 sctp_stop_all_cookie_timers(stcb); 737 sctp_toss_old_cookies(stcb, &stcb->asoc); 738 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 739 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 740 /* 741 * put it in the bucket in the vtag hash of assoc's for the 742 * system 743 */ 744 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 745 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 746 return (1); 747 } 748 return (0); 749} 750 751static int 752sctp_handle_nat_missing_state(struct sctp_tcb *stcb, 753 struct sctp_nets *net) 754{ 755 /* 756 * return 0 means we want you to proceed with the abort non-zero 757 * means no abort processing 758 */ 759 if (stcb->asoc.auth_supported == 0) { 760 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n"); 761 return (0); 762 } 763 sctp_asconf_send_nat_state_update(stcb, net); 764 return (1); 765} 766 767 768static void 769sctp_handle_abort(struct sctp_abort_chunk *abort, 770 struct sctp_tcb *stcb, struct sctp_nets *net) 771{ 772#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 773 struct socket *so; 774 775#endif 776 uint16_t len; 777 uint16_t error; 778 779 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n"); 780 if (stcb == NULL) 781 return; 782 783 len = ntohs(abort->ch.chunk_length); 784 if (len > sizeof(struct sctp_chunkhdr)) { 785 /* 786 * Need to check the cause codes for our two magic nat 787 * aborts which don't kill the assoc necessarily. 788 */ 789 struct sctp_missing_nat_state *natc; 790 791 natc = (struct sctp_missing_nat_state *)(abort + 1); 792 error = ntohs(natc->cause); 793 if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) { 794 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n", 795 abort->ch.chunk_flags); 796 if (sctp_handle_nat_colliding_state(stcb)) { 797 return; 798 } 799 } else if (error == SCTP_CAUSE_NAT_MISSING_STATE) { 800 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n", 801 abort->ch.chunk_flags); 802 if (sctp_handle_nat_missing_state(stcb, net)) { 803 return; 804 } 805 } 806 } else { 807 error = 0; 808 } 809 /* stop any receive timers */ 810 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_6); 811 /* notify user of the abort and clean up... */ 812 sctp_abort_notification(stcb, 1, error, abort, SCTP_SO_NOT_LOCKED); 813 /* free the tcb */ 814 SCTP_STAT_INCR_COUNTER32(sctps_aborted); 815 if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) || 816 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 817 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 818 } 819#ifdef SCTP_ASOCLOG_OF_TSNS 820 sctp_print_out_track_log(stcb); 821#endif 822#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 823 so = SCTP_INP_SO(stcb->sctp_ep); 824 atomic_add_int(&stcb->asoc.refcnt, 1); 825 SCTP_TCB_UNLOCK(stcb); 826 SCTP_SOCKET_LOCK(so, 1); 827 SCTP_TCB_LOCK(stcb); 828 atomic_subtract_int(&stcb->asoc.refcnt, 1); 829#endif 830 stcb->asoc.state |= SCTP_STATE_WAS_ABORTED; 831 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 832 SCTP_FROM_SCTP_INPUT + SCTP_LOC_6); 833#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 834 SCTP_SOCKET_UNLOCK(so, 1); 835#endif 836 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n"); 837} 838 839static void 840sctp_start_net_timers(struct sctp_tcb *stcb) 841{ 842 uint32_t cnt_hb_sent; 843 struct sctp_nets *net; 844 845 cnt_hb_sent = 0; 846 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 847 /* 848 * For each network start: 1) A pmtu timer. 2) A HB timer 3) 849 * If the dest in unconfirmed send a hb as well if under 850 * max_hb_burst have been sent. 851 */ 852 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net); 853 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net); 854 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) && 855 (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) { 856 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 857 cnt_hb_sent++; 858 } 859 } 860 if (cnt_hb_sent) { 861 sctp_chunk_output(stcb->sctp_ep, stcb, 862 SCTP_OUTPUT_FROM_COOKIE_ACK, 863 SCTP_SO_NOT_LOCKED); 864 } 865} 866 867 868static void 869sctp_handle_shutdown(struct sctp_shutdown_chunk *cp, 870 struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag) 871{ 872 struct sctp_association *asoc; 873 int some_on_streamwheel; 874 875#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 876 struct socket *so; 877 878#endif 879 880 SCTPDBG(SCTP_DEBUG_INPUT2, 881 "sctp_handle_shutdown: handling SHUTDOWN\n"); 882 if (stcb == NULL) 883 return; 884 asoc = &stcb->asoc; 885 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) || 886 (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) { 887 return; 888 } 889 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) { 890 /* Shutdown NOT the expected size */ 891 return; 892 } else { 893 sctp_update_acked(stcb, cp, abort_flag); 894 if (*abort_flag) { 895 return; 896 } 897 } 898 if (asoc->control_pdapi) { 899 /* 900 * With a normal shutdown we assume the end of last record. 901 */ 902 SCTP_INP_READ_LOCK(stcb->sctp_ep); 903 asoc->control_pdapi->end_added = 1; 904 asoc->control_pdapi->pdapi_aborted = 1; 905 asoc->control_pdapi = NULL; 906 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 907#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 908 so = SCTP_INP_SO(stcb->sctp_ep); 909 atomic_add_int(&stcb->asoc.refcnt, 1); 910 SCTP_TCB_UNLOCK(stcb); 911 SCTP_SOCKET_LOCK(so, 1); 912 SCTP_TCB_LOCK(stcb); 913 atomic_subtract_int(&stcb->asoc.refcnt, 1); 914 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 915 /* assoc was freed while we were unlocked */ 916 SCTP_SOCKET_UNLOCK(so, 1); 917 return; 918 } 919#endif 920 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 921#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 922 SCTP_SOCKET_UNLOCK(so, 1); 923#endif 924 } 925 /* goto SHUTDOWN_RECEIVED state to block new requests */ 926 if (stcb->sctp_socket) { 927 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) && 928 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) && 929 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) { 930 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_RECEIVED); 931 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 932 /* 933 * notify upper layer that peer has initiated a 934 * shutdown 935 */ 936 sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 937 938 /* reset time */ 939 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 940 } 941 } 942 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) { 943 /* 944 * stop the shutdown timer, since we WILL move to 945 * SHUTDOWN-ACK-SENT. 946 */ 947 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_8); 948 } 949 /* Now is there unsent data on a stream somewhere? */ 950 some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED); 951 952 if (!TAILQ_EMPTY(&asoc->send_queue) || 953 !TAILQ_EMPTY(&asoc->sent_queue) || 954 some_on_streamwheel) { 955 /* By returning we will push more data out */ 956 return; 957 } else { 958 /* no outstanding data to send, so move on... */ 959 /* send SHUTDOWN-ACK */ 960 /* move to SHUTDOWN-ACK-SENT state */ 961 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) || 962 (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 963 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 964 } 965 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT); 966 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 967 sctp_stop_timers_for_shutdown(stcb); 968 sctp_send_shutdown_ack(stcb, net); 969 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, 970 stcb, net); 971 } 972} 973 974static void 975sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED, 976 struct sctp_tcb *stcb, 977 struct sctp_nets *net) 978{ 979 struct sctp_association *asoc; 980 981#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 982 struct socket *so; 983 984 so = SCTP_INP_SO(stcb->sctp_ep); 985#endif 986 SCTPDBG(SCTP_DEBUG_INPUT2, 987 "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n"); 988 if (stcb == NULL) 989 return; 990 991 asoc = &stcb->asoc; 992 /* process according to association state */ 993 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) || 994 (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) { 995 /* unexpected SHUTDOWN-ACK... do OOTB handling... */ 996 sctp_send_shutdown_complete(stcb, net, 1); 997 SCTP_TCB_UNLOCK(stcb); 998 return; 999 } 1000 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) && 1001 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) { 1002 /* unexpected SHUTDOWN-ACK... so ignore... */ 1003 SCTP_TCB_UNLOCK(stcb); 1004 return; 1005 } 1006 if (asoc->control_pdapi) { 1007 /* 1008 * With a normal shutdown we assume the end of last record. 1009 */ 1010 SCTP_INP_READ_LOCK(stcb->sctp_ep); 1011 asoc->control_pdapi->end_added = 1; 1012 asoc->control_pdapi->pdapi_aborted = 1; 1013 asoc->control_pdapi = NULL; 1014 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 1015#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1016 atomic_add_int(&stcb->asoc.refcnt, 1); 1017 SCTP_TCB_UNLOCK(stcb); 1018 SCTP_SOCKET_LOCK(so, 1); 1019 SCTP_TCB_LOCK(stcb); 1020 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1021 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1022 /* assoc was freed while we were unlocked */ 1023 SCTP_SOCKET_UNLOCK(so, 1); 1024 return; 1025 } 1026#endif 1027 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 1028#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1029 SCTP_SOCKET_UNLOCK(so, 1); 1030#endif 1031 } 1032#ifdef INVARIANTS 1033 if (!TAILQ_EMPTY(&asoc->send_queue) || 1034 !TAILQ_EMPTY(&asoc->sent_queue) || 1035 !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 1036 panic("Queues are not empty when handling SHUTDOWN-ACK"); 1037 } 1038#endif 1039 /* stop the timer */ 1040 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9); 1041 /* send SHUTDOWN-COMPLETE */ 1042 sctp_send_shutdown_complete(stcb, net, 0); 1043 /* notify upper layer protocol */ 1044 if (stcb->sctp_socket) { 1045 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1046 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 1047 stcb->sctp_socket->so_snd.sb_cc = 0; 1048 } 1049 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 1050 } 1051 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 1052 /* free the TCB but first save off the ep */ 1053#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1054 atomic_add_int(&stcb->asoc.refcnt, 1); 1055 SCTP_TCB_UNLOCK(stcb); 1056 SCTP_SOCKET_LOCK(so, 1); 1057 SCTP_TCB_LOCK(stcb); 1058 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1059#endif 1060 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1061 SCTP_FROM_SCTP_INPUT + SCTP_LOC_10); 1062#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1063 SCTP_SOCKET_UNLOCK(so, 1); 1064#endif 1065} 1066 1067/* 1068 * Skip past the param header and then we will find the chunk that caused the 1069 * problem. There are two possiblities ASCONF or FWD-TSN other than that and 1070 * our peer must be broken. 1071 */ 1072static void 1073sctp_process_unrecog_chunk(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr, 1074 struct sctp_nets *net) 1075{ 1076 struct sctp_chunkhdr *chk; 1077 1078 chk = (struct sctp_chunkhdr *)((caddr_t)phdr + sizeof(*phdr)); 1079 switch (chk->chunk_type) { 1080 case SCTP_ASCONF_ACK: 1081 case SCTP_ASCONF: 1082 sctp_asconf_cleanup(stcb, net); 1083 break; 1084 case SCTP_FORWARD_CUM_TSN: 1085 stcb->asoc.prsctp_supported = 0; 1086 break; 1087 default: 1088 SCTPDBG(SCTP_DEBUG_INPUT2, 1089 "Peer does not support chunk type %d(%x)??\n", 1090 chk->chunk_type, (uint32_t) chk->chunk_type); 1091 break; 1092 } 1093} 1094 1095/* 1096 * Skip past the param header and then we will find the param that caused the 1097 * problem. There are a number of param's in a ASCONF OR the prsctp param 1098 * these will turn of specific features. 1099 * XXX: Is this the right thing to do? 1100 */ 1101static void 1102sctp_process_unrecog_param(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr) 1103{ 1104 struct sctp_paramhdr *pbad; 1105 1106 pbad = phdr + 1; 1107 switch (ntohs(pbad->param_type)) { 1108 /* pr-sctp draft */ 1109 case SCTP_PRSCTP_SUPPORTED: 1110 stcb->asoc.prsctp_supported = 0; 1111 break; 1112 case SCTP_SUPPORTED_CHUNK_EXT: 1113 break; 1114 /* draft-ietf-tsvwg-addip-sctp */ 1115 case SCTP_HAS_NAT_SUPPORT: 1116 stcb->asoc.peer_supports_nat = 0; 1117 break; 1118 case SCTP_ADD_IP_ADDRESS: 1119 case SCTP_DEL_IP_ADDRESS: 1120 case SCTP_SET_PRIM_ADDR: 1121 stcb->asoc.asconf_supported = 0; 1122 break; 1123 case SCTP_SUCCESS_REPORT: 1124 case SCTP_ERROR_CAUSE_IND: 1125 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n"); 1126 SCTPDBG(SCTP_DEBUG_INPUT2, 1127 "Turning off ASCONF to this strange peer\n"); 1128 stcb->asoc.asconf_supported = 0; 1129 break; 1130 default: 1131 SCTPDBG(SCTP_DEBUG_INPUT2, 1132 "Peer does not support param type %d(%x)??\n", 1133 pbad->param_type, (uint32_t) pbad->param_type); 1134 break; 1135 } 1136} 1137 1138static int 1139sctp_handle_error(struct sctp_chunkhdr *ch, 1140 struct sctp_tcb *stcb, struct sctp_nets *net) 1141{ 1142 int chklen; 1143 struct sctp_paramhdr *phdr; 1144 uint16_t error, error_type; 1145 uint16_t error_len; 1146 struct sctp_association *asoc; 1147 int adjust; 1148 1149#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1150 struct socket *so; 1151 1152#endif 1153 1154 /* parse through all of the errors and process */ 1155 asoc = &stcb->asoc; 1156 phdr = (struct sctp_paramhdr *)((caddr_t)ch + 1157 sizeof(struct sctp_chunkhdr)); 1158 chklen = ntohs(ch->chunk_length) - sizeof(struct sctp_chunkhdr); 1159 error = 0; 1160 while ((size_t)chklen >= sizeof(struct sctp_paramhdr)) { 1161 /* Process an Error Cause */ 1162 error_type = ntohs(phdr->param_type); 1163 error_len = ntohs(phdr->param_length); 1164 if ((error_len > chklen) || (error_len == 0)) { 1165 /* invalid param length for this param */ 1166 SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in error param- chunk left:%d errorlen:%d\n", 1167 chklen, error_len); 1168 return (0); 1169 } 1170 if (error == 0) { 1171 /* report the first error cause */ 1172 error = error_type; 1173 } 1174 switch (error_type) { 1175 case SCTP_CAUSE_INVALID_STREAM: 1176 case SCTP_CAUSE_MISSING_PARAM: 1177 case SCTP_CAUSE_INVALID_PARAM: 1178 case SCTP_CAUSE_NO_USER_DATA: 1179 SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %d back? We have a bug :/ (or do they?)\n", 1180 error_type); 1181 break; 1182 case SCTP_CAUSE_NAT_COLLIDING_STATE: 1183 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n", 1184 ch->chunk_flags); 1185 if (sctp_handle_nat_colliding_state(stcb)) { 1186 return (0); 1187 } 1188 break; 1189 case SCTP_CAUSE_NAT_MISSING_STATE: 1190 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n", 1191 ch->chunk_flags); 1192 if (sctp_handle_nat_missing_state(stcb, net)) { 1193 return (0); 1194 } 1195 break; 1196 case SCTP_CAUSE_STALE_COOKIE: 1197 /* 1198 * We only act if we have echoed a cookie and are 1199 * waiting. 1200 */ 1201 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) { 1202 int *p; 1203 1204 p = (int *)((caddr_t)phdr + sizeof(*phdr)); 1205 /* Save the time doubled */ 1206 asoc->cookie_preserve_req = ntohl(*p) << 1; 1207 asoc->stale_cookie_count++; 1208 if (asoc->stale_cookie_count > 1209 asoc->max_init_times) { 1210 sctp_abort_notification(stcb, 0, 0, NULL, SCTP_SO_NOT_LOCKED); 1211 /* now free the asoc */ 1212#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1213 so = SCTP_INP_SO(stcb->sctp_ep); 1214 atomic_add_int(&stcb->asoc.refcnt, 1); 1215 SCTP_TCB_UNLOCK(stcb); 1216 SCTP_SOCKET_LOCK(so, 1); 1217 SCTP_TCB_LOCK(stcb); 1218 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1219#endif 1220 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1221 SCTP_FROM_SCTP_INPUT + SCTP_LOC_11); 1222#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1223 SCTP_SOCKET_UNLOCK(so, 1); 1224#endif 1225 return (-1); 1226 } 1227 /* blast back to INIT state */ 1228 sctp_toss_old_cookies(stcb, &stcb->asoc); 1229 asoc->state &= ~SCTP_STATE_COOKIE_ECHOED; 1230 asoc->state |= SCTP_STATE_COOKIE_WAIT; 1231 sctp_stop_all_cookie_timers(stcb); 1232 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 1233 } 1234 break; 1235 case SCTP_CAUSE_UNRESOLVABLE_ADDR: 1236 /* 1237 * Nothing we can do here, we don't do hostname 1238 * addresses so if the peer does not like my IPv6 1239 * (or IPv4 for that matter) it does not matter. If 1240 * they don't support that type of address, they can 1241 * NOT possibly get that packet type... i.e. with no 1242 * IPv6 you can't recieve a IPv6 packet. so we can 1243 * safely ignore this one. If we ever added support 1244 * for HOSTNAME Addresses, then we would need to do 1245 * something here. 1246 */ 1247 break; 1248 case SCTP_CAUSE_UNRECOG_CHUNK: 1249 sctp_process_unrecog_chunk(stcb, phdr, net); 1250 break; 1251 case SCTP_CAUSE_UNRECOG_PARAM: 1252 sctp_process_unrecog_param(stcb, phdr); 1253 break; 1254 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN: 1255 /* 1256 * We ignore this since the timer will drive out a 1257 * new cookie anyway and there timer will drive us 1258 * to send a SHUTDOWN_COMPLETE. We can't send one 1259 * here since we don't have their tag. 1260 */ 1261 break; 1262 case SCTP_CAUSE_DELETING_LAST_ADDR: 1263 case SCTP_CAUSE_RESOURCE_SHORTAGE: 1264 case SCTP_CAUSE_DELETING_SRC_ADDR: 1265 /* 1266 * We should NOT get these here, but in a 1267 * ASCONF-ACK. 1268 */ 1269 SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a Operational Error?<%d>?\n", 1270 error_type); 1271 break; 1272 case SCTP_CAUSE_OUT_OF_RESC: 1273 /* 1274 * And what, pray tell do we do with the fact that 1275 * the peer is out of resources? Not really sure we 1276 * could do anything but abort. I suspect this 1277 * should have came WITH an abort instead of in a 1278 * OP-ERROR. 1279 */ 1280 break; 1281 default: 1282 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown error type = 0x%xh\n", 1283 error_type); 1284 break; 1285 } 1286 adjust = SCTP_SIZE32(error_len); 1287 chklen -= adjust; 1288 phdr = (struct sctp_paramhdr *)((caddr_t)phdr + adjust); 1289 } 1290 sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, error, ch, SCTP_SO_NOT_LOCKED); 1291 return (0); 1292} 1293 1294static int 1295sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset, 1296 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 1297 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 1298 struct sctp_nets *net, int *abort_no_unlock, 1299 uint8_t use_mflowid, uint32_t mflowid, 1300 uint32_t vrf_id) 1301{ 1302 struct sctp_init_ack *init_ack; 1303 struct mbuf *op_err; 1304 1305 SCTPDBG(SCTP_DEBUG_INPUT2, 1306 "sctp_handle_init_ack: handling INIT-ACK\n"); 1307 1308 if (stcb == NULL) { 1309 SCTPDBG(SCTP_DEBUG_INPUT2, 1310 "sctp_handle_init_ack: TCB is null\n"); 1311 return (-1); 1312 } 1313 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) { 1314 /* Invalid length */ 1315 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1316 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1317 src, dst, sh, op_err, 1318 use_mflowid, mflowid, 1319 vrf_id, net->port); 1320 *abort_no_unlock = 1; 1321 return (-1); 1322 } 1323 init_ack = &cp->init; 1324 /* validate parameters */ 1325 if (init_ack->initiate_tag == 0) { 1326 /* protocol error... send an abort */ 1327 op_err = sctp_generate_cause(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 (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) { 1336 /* protocol error... send an abort */ 1337 op_err = sctp_generate_cause(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_inbound_streams == 0) { 1346 /* protocol error... send an abort */ 1347 op_err = sctp_generate_cause(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 if (init_ack->num_outbound_streams == 0) { 1356 /* protocol error... send an abort */ 1357 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1358 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1359 src, dst, sh, op_err, 1360 use_mflowid, mflowid, 1361 vrf_id, net->port); 1362 *abort_no_unlock = 1; 1363 return (-1); 1364 } 1365 /* process according to association state... */ 1366 switch (stcb->asoc.state & SCTP_STATE_MASK) { 1367 case SCTP_STATE_COOKIE_WAIT: 1368 /* this is the expected state for this chunk */ 1369 /* process the INIT-ACK parameters */ 1370 if (stcb->asoc.primary_destination->dest_state & 1371 SCTP_ADDR_UNCONFIRMED) { 1372 /* 1373 * The primary is where we sent the INIT, we can 1374 * always consider it confirmed when the INIT-ACK is 1375 * returned. Do this before we load addresses 1376 * though. 1377 */ 1378 stcb->asoc.primary_destination->dest_state &= 1379 ~SCTP_ADDR_UNCONFIRMED; 1380 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 1381 stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED); 1382 } 1383 if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb, 1384 net, abort_no_unlock, 1385 use_mflowid, mflowid, 1386 vrf_id) < 0) { 1387 /* error in parsing parameters */ 1388 return (-1); 1389 } 1390 /* update our state */ 1391 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n"); 1392 SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_ECHOED); 1393 1394 /* reset the RTO calc */ 1395 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 1396 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 1397 stcb->asoc.overall_error_count, 1398 0, 1399 SCTP_FROM_SCTP_INPUT, 1400 __LINE__); 1401 } 1402 stcb->asoc.overall_error_count = 0; 1403 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 1404 /* 1405 * collapse the init timer back in case of a exponential 1406 * backoff 1407 */ 1408 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep, 1409 stcb, net); 1410 /* 1411 * the send at the end of the inbound data processing will 1412 * cause the cookie to be sent 1413 */ 1414 break; 1415 case SCTP_STATE_SHUTDOWN_SENT: 1416 /* incorrect state... discard */ 1417 break; 1418 case SCTP_STATE_COOKIE_ECHOED: 1419 /* incorrect state... discard */ 1420 break; 1421 case SCTP_STATE_OPEN: 1422 /* incorrect state... discard */ 1423 break; 1424 case SCTP_STATE_EMPTY: 1425 case SCTP_STATE_INUSE: 1426 default: 1427 /* incorrect state... discard */ 1428 return (-1); 1429 break; 1430 } 1431 SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n"); 1432 return (0); 1433} 1434 1435static struct sctp_tcb * 1436sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1437 struct sockaddr *src, struct sockaddr *dst, 1438 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1439 struct sctp_inpcb *inp, struct sctp_nets **netp, 1440 struct sockaddr *init_src, int *notification, 1441 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1442 uint8_t use_mflowid, uint32_t mflowid, 1443 uint32_t vrf_id, uint16_t port); 1444 1445 1446/* 1447 * handle a state cookie for an existing association m: input packet mbuf 1448 * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a 1449 * "split" mbuf and the cookie signature does not exist offset: offset into 1450 * mbuf to the cookie-echo chunk 1451 */ 1452static struct sctp_tcb * 1453sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset, 1454 struct sockaddr *src, struct sockaddr *dst, 1455 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1456 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp, 1457 struct sockaddr *init_src, int *notification, 1458 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1459 uint8_t use_mflowid, uint32_t mflowid, 1460 uint32_t vrf_id, uint16_t port) 1461{ 1462 struct sctp_association *asoc; 1463 struct sctp_init_chunk *init_cp, init_buf; 1464 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1465 struct sctp_nets *net; 1466 struct mbuf *op_err; 1467 int init_offset, initack_offset, i; 1468 int retval; 1469 int spec_flag = 0; 1470 uint32_t how_indx; 1471 1472#if defined(SCTP_DETAILED_STR_STATS) 1473 int j; 1474 1475#endif 1476 1477 net = *netp; 1478 /* I know that the TCB is non-NULL from the caller */ 1479 asoc = &stcb->asoc; 1480 for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) { 1481 if (asoc->cookie_how[how_indx] == 0) 1482 break; 1483 } 1484 if (how_indx < sizeof(asoc->cookie_how)) { 1485 asoc->cookie_how[how_indx] = 1; 1486 } 1487 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 1488 /* SHUTDOWN came in after sending INIT-ACK */ 1489 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination); 1490 op_err = sctp_generate_cause(SCTP_CAUSE_COOKIE_IN_SHUTDOWN, ""); 1491 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 1492 use_mflowid, mflowid, 1493 vrf_id, net->port); 1494 if (how_indx < sizeof(asoc->cookie_how)) 1495 asoc->cookie_how[how_indx] = 2; 1496 return (NULL); 1497 } 1498 /* 1499 * find and validate the INIT chunk in the cookie (peer's info) the 1500 * INIT should start after the cookie-echo header struct (chunk 1501 * header, state cookie header struct) 1502 */ 1503 init_offset = offset += sizeof(struct sctp_cookie_echo_chunk); 1504 1505 init_cp = (struct sctp_init_chunk *) 1506 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 1507 (uint8_t *) & init_buf); 1508 if (init_cp == NULL) { 1509 /* could not pull a INIT chunk in cookie */ 1510 return (NULL); 1511 } 1512 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 1513 return (NULL); 1514 } 1515 /* 1516 * find and validate the INIT-ACK chunk in the cookie (my info) the 1517 * INIT-ACK follows the INIT chunk 1518 */ 1519 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 1520 initack_cp = (struct sctp_init_ack_chunk *) 1521 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 1522 (uint8_t *) & initack_buf); 1523 if (initack_cp == NULL) { 1524 /* could not pull INIT-ACK chunk in cookie */ 1525 return (NULL); 1526 } 1527 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 1528 return (NULL); 1529 } 1530 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1531 (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) { 1532 /* 1533 * case D in Section 5.2.4 Table 2: MMAA process accordingly 1534 * to get into the OPEN state 1535 */ 1536 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1537 /*- 1538 * Opps, this means that we somehow generated two vtag's 1539 * the same. I.e. we did: 1540 * Us Peer 1541 * <---INIT(tag=a)------ 1542 * ----INIT-ACK(tag=t)--> 1543 * ----INIT(tag=t)------> *1 1544 * <---INIT-ACK(tag=a)--- 1545 * <----CE(tag=t)------------- *2 1546 * 1547 * At point *1 we should be generating a different 1548 * tag t'. Which means we would throw away the CE and send 1549 * ours instead. Basically this is case C (throw away side). 1550 */ 1551 if (how_indx < sizeof(asoc->cookie_how)) 1552 asoc->cookie_how[how_indx] = 17; 1553 return (NULL); 1554 1555 } 1556 switch (SCTP_GET_STATE(asoc)) { 1557 case SCTP_STATE_COOKIE_WAIT: 1558 case SCTP_STATE_COOKIE_ECHOED: 1559 /* 1560 * INIT was sent but got a COOKIE_ECHO with the 1561 * correct tags... just accept it...but we must 1562 * process the init so that we can make sure we have 1563 * the right seq no's. 1564 */ 1565 /* First we must process the INIT !! */ 1566 retval = sctp_process_init(init_cp, stcb); 1567 if (retval < 0) { 1568 if (how_indx < sizeof(asoc->cookie_how)) 1569 asoc->cookie_how[how_indx] = 3; 1570 return (NULL); 1571 } 1572 /* we have already processed the INIT so no problem */ 1573 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, 1574 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_12); 1575 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_13); 1576 /* update current state */ 1577 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) 1578 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1579 else 1580 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1581 1582 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1583 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1584 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1585 stcb->sctp_ep, stcb, asoc->primary_destination); 1586 } 1587 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1588 sctp_stop_all_cookie_timers(stcb); 1589 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1590 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1591 (inp->sctp_socket->so_qlimit == 0) 1592 ) { 1593#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1594 struct socket *so; 1595 1596#endif 1597 /* 1598 * Here is where collision would go if we 1599 * did a connect() and instead got a 1600 * init/init-ack/cookie done before the 1601 * init-ack came back.. 1602 */ 1603 stcb->sctp_ep->sctp_flags |= 1604 SCTP_PCB_FLAGS_CONNECTED; 1605#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1606 so = SCTP_INP_SO(stcb->sctp_ep); 1607 atomic_add_int(&stcb->asoc.refcnt, 1); 1608 SCTP_TCB_UNLOCK(stcb); 1609 SCTP_SOCKET_LOCK(so, 1); 1610 SCTP_TCB_LOCK(stcb); 1611 atomic_add_int(&stcb->asoc.refcnt, -1); 1612 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1613 SCTP_SOCKET_UNLOCK(so, 1); 1614 return (NULL); 1615 } 1616#endif 1617 soisconnected(stcb->sctp_socket); 1618#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1619 SCTP_SOCKET_UNLOCK(so, 1); 1620#endif 1621 } 1622 /* notify upper layer */ 1623 *notification = SCTP_NOTIFY_ASSOC_UP; 1624 /* 1625 * since we did not send a HB make sure we don't 1626 * double things 1627 */ 1628 net->hb_responded = 1; 1629 net->RTO = sctp_calculate_rto(stcb, asoc, net, 1630 &cookie->time_entered, 1631 sctp_align_unsafe_makecopy, 1632 SCTP_RTT_FROM_NON_DATA); 1633 1634 if (stcb->asoc.sctp_autoclose_ticks && 1635 (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) { 1636 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 1637 inp, stcb, NULL); 1638 } 1639 break; 1640 default: 1641 /* 1642 * we're in the OPEN state (or beyond), so peer must 1643 * have simply lost the COOKIE-ACK 1644 */ 1645 break; 1646 } /* end switch */ 1647 sctp_stop_all_cookie_timers(stcb); 1648 /* 1649 * We ignore the return code here.. not sure if we should 1650 * somehow abort.. but we do have an existing asoc. This 1651 * really should not fail. 1652 */ 1653 if (sctp_load_addresses_from_init(stcb, m, 1654 init_offset + sizeof(struct sctp_init_chunk), 1655 initack_offset, src, dst, init_src)) { 1656 if (how_indx < sizeof(asoc->cookie_how)) 1657 asoc->cookie_how[how_indx] = 4; 1658 return (NULL); 1659 } 1660 /* respond with a COOKIE-ACK */ 1661 sctp_toss_old_cookies(stcb, asoc); 1662 sctp_send_cookie_ack(stcb); 1663 if (how_indx < sizeof(asoc->cookie_how)) 1664 asoc->cookie_how[how_indx] = 5; 1665 return (stcb); 1666 } 1667 if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1668 ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag && 1669 cookie->tie_tag_my_vtag == 0 && 1670 cookie->tie_tag_peer_vtag == 0) { 1671 /* 1672 * case C in Section 5.2.4 Table 2: XMOO silently discard 1673 */ 1674 if (how_indx < sizeof(asoc->cookie_how)) 1675 asoc->cookie_how[how_indx] = 6; 1676 return (NULL); 1677 } 1678 /* 1679 * If nat support, and the below and stcb is established, send back 1680 * a ABORT(colliding state) if we are established. 1681 */ 1682 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) && 1683 (asoc->peer_supports_nat) && 1684 ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1685 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1686 (asoc->peer_vtag == 0)))) { 1687 /* 1688 * Special case - Peer's support nat. We may have two init's 1689 * that we gave out the same tag on since one was not 1690 * established.. i.e. we get INIT from host-1 behind the nat 1691 * and we respond tag-a, we get a INIT from host-2 behind 1692 * the nat and we get tag-a again. Then we bring up host-1 1693 * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1). 1694 * Now we have colliding state. We must send an abort here 1695 * with colliding state indication. 1696 */ 1697 op_err = sctp_generate_cause(SCTP_CAUSE_NAT_COLLIDING_STATE, ""); 1698 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err, 1699 use_mflowid, mflowid, 1700 vrf_id, port); 1701 return (NULL); 1702 } 1703 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1704 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1705 (asoc->peer_vtag == 0))) { 1706 /* 1707 * case B in Section 5.2.4 Table 2: MXAA or MOAA my info 1708 * should be ok, re-accept peer info 1709 */ 1710 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1711 /* 1712 * Extension of case C. If we hit this, then the 1713 * random number generator returned the same vtag 1714 * when we first sent our INIT-ACK and when we later 1715 * sent our INIT. The side with the seq numbers that 1716 * are different will be the one that normnally 1717 * would have hit case C. This in effect "extends" 1718 * our vtags in this collision case to be 64 bits. 1719 * The same collision could occur aka you get both 1720 * vtag and seq number the same twice in a row.. but 1721 * is much less likely. If it did happen then we 1722 * would proceed through and bring up the assoc.. we 1723 * may end up with the wrong stream setup however.. 1724 * which would be bad.. but there is no way to 1725 * tell.. until we send on a stream that does not 1726 * exist :-) 1727 */ 1728 if (how_indx < sizeof(asoc->cookie_how)) 1729 asoc->cookie_how[how_indx] = 7; 1730 1731 return (NULL); 1732 } 1733 if (how_indx < sizeof(asoc->cookie_how)) 1734 asoc->cookie_how[how_indx] = 8; 1735 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_14); 1736 sctp_stop_all_cookie_timers(stcb); 1737 /* 1738 * since we did not send a HB make sure we don't double 1739 * things 1740 */ 1741 net->hb_responded = 1; 1742 if (stcb->asoc.sctp_autoclose_ticks && 1743 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 1744 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, 1745 NULL); 1746 } 1747 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1748 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 1749 1750 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) { 1751 /* 1752 * Ok the peer probably discarded our data (if we 1753 * echoed a cookie+data). So anything on the 1754 * sent_queue should be marked for retransmit, we 1755 * may not get something to kick us so it COULD 1756 * still take a timeout to move these.. but it can't 1757 * hurt to mark them. 1758 */ 1759 struct sctp_tmit_chunk *chk; 1760 1761 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 1762 if (chk->sent < SCTP_DATAGRAM_RESEND) { 1763 chk->sent = SCTP_DATAGRAM_RESEND; 1764 sctp_flight_size_decrease(chk); 1765 sctp_total_flight_decrease(stcb, chk); 1766 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 1767 spec_flag++; 1768 } 1769 } 1770 1771 } 1772 /* process the INIT info (peer's info) */ 1773 retval = sctp_process_init(init_cp, stcb); 1774 if (retval < 0) { 1775 if (how_indx < sizeof(asoc->cookie_how)) 1776 asoc->cookie_how[how_indx] = 9; 1777 return (NULL); 1778 } 1779 if (sctp_load_addresses_from_init(stcb, m, 1780 init_offset + sizeof(struct sctp_init_chunk), 1781 initack_offset, src, dst, init_src)) { 1782 if (how_indx < sizeof(asoc->cookie_how)) 1783 asoc->cookie_how[how_indx] = 10; 1784 return (NULL); 1785 } 1786 if ((asoc->state & SCTP_STATE_COOKIE_WAIT) || 1787 (asoc->state & SCTP_STATE_COOKIE_ECHOED)) { 1788 *notification = SCTP_NOTIFY_ASSOC_UP; 1789 1790 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1791 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1792 (inp->sctp_socket->so_qlimit == 0)) { 1793#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1794 struct socket *so; 1795 1796#endif 1797 stcb->sctp_ep->sctp_flags |= 1798 SCTP_PCB_FLAGS_CONNECTED; 1799#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1800 so = SCTP_INP_SO(stcb->sctp_ep); 1801 atomic_add_int(&stcb->asoc.refcnt, 1); 1802 SCTP_TCB_UNLOCK(stcb); 1803 SCTP_SOCKET_LOCK(so, 1); 1804 SCTP_TCB_LOCK(stcb); 1805 atomic_add_int(&stcb->asoc.refcnt, -1); 1806 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1807 SCTP_SOCKET_UNLOCK(so, 1); 1808 return (NULL); 1809 } 1810#endif 1811 soisconnected(stcb->sctp_socket); 1812#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1813 SCTP_SOCKET_UNLOCK(so, 1); 1814#endif 1815 } 1816 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) 1817 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1818 else 1819 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1820 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1821 } else if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) { 1822 SCTP_STAT_INCR_COUNTER32(sctps_restartestab); 1823 } else { 1824 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1825 } 1826 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1827 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1828 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1829 stcb->sctp_ep, stcb, asoc->primary_destination); 1830 } 1831 sctp_stop_all_cookie_timers(stcb); 1832 sctp_toss_old_cookies(stcb, asoc); 1833 sctp_send_cookie_ack(stcb); 1834 if (spec_flag) { 1835 /* 1836 * only if we have retrans set do we do this. What 1837 * this call does is get only the COOKIE-ACK out and 1838 * then when we return the normal call to 1839 * sctp_chunk_output will get the retrans out behind 1840 * this. 1841 */ 1842 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED); 1843 } 1844 if (how_indx < sizeof(asoc->cookie_how)) 1845 asoc->cookie_how[how_indx] = 11; 1846 1847 return (stcb); 1848 } 1849 if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1850 ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) && 1851 cookie->tie_tag_my_vtag == asoc->my_vtag_nonce && 1852 cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce && 1853 cookie->tie_tag_peer_vtag != 0) { 1854 struct sctpasochead *head; 1855 1856#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1857 struct socket *so; 1858 1859#endif 1860 1861 if (asoc->peer_supports_nat) { 1862 /* 1863 * This is a gross gross hack. Just call the 1864 * cookie_new code since we are allowing a duplicate 1865 * association. I hope this works... 1866 */ 1867 return (sctp_process_cookie_new(m, iphlen, offset, src, dst, 1868 sh, cookie, cookie_len, 1869 inp, netp, init_src, notification, 1870 auth_skipped, auth_offset, auth_len, 1871 use_mflowid, mflowid, 1872 vrf_id, port)); 1873 } 1874 /* 1875 * case A in Section 5.2.4 Table 2: XXMM (peer restarted) 1876 */ 1877 /* temp code */ 1878 if (how_indx < sizeof(asoc->cookie_how)) 1879 asoc->cookie_how[how_indx] = 12; 1880 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_15); 1881 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 1882 1883 /* notify upper layer */ 1884 *notification = SCTP_NOTIFY_ASSOC_RESTART; 1885 atomic_add_int(&stcb->asoc.refcnt, 1); 1886 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_OPEN) && 1887 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) && 1888 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) { 1889 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1890 } 1891 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) { 1892 SCTP_STAT_INCR_GAUGE32(sctps_restartestab); 1893 } else if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) { 1894 SCTP_STAT_INCR_GAUGE32(sctps_collisionestab); 1895 } 1896 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1897 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1898 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1899 stcb->sctp_ep, stcb, asoc->primary_destination); 1900 1901 } else if (!(asoc->state & SCTP_STATE_SHUTDOWN_SENT)) { 1902 /* move to OPEN state, if not in SHUTDOWN_SENT */ 1903 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1904 } 1905 asoc->pre_open_streams = 1906 ntohs(initack_cp->init.num_outbound_streams); 1907 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 1908 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 1909 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 1910 1911 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 1912 1913 asoc->str_reset_seq_in = asoc->init_seq_number; 1914 1915 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 1916 if (asoc->mapping_array) { 1917 memset(asoc->mapping_array, 0, 1918 asoc->mapping_array_size); 1919 } 1920 if (asoc->nr_mapping_array) { 1921 memset(asoc->nr_mapping_array, 0, 1922 asoc->mapping_array_size); 1923 } 1924 SCTP_TCB_UNLOCK(stcb); 1925#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1926 so = SCTP_INP_SO(stcb->sctp_ep); 1927 SCTP_SOCKET_LOCK(so, 1); 1928#endif 1929 SCTP_INP_INFO_WLOCK(); 1930 SCTP_INP_WLOCK(stcb->sctp_ep); 1931 SCTP_TCB_LOCK(stcb); 1932 atomic_add_int(&stcb->asoc.refcnt, -1); 1933 /* send up all the data */ 1934 SCTP_TCB_SEND_LOCK(stcb); 1935 1936 sctp_report_all_outbound(stcb, 0, 1, SCTP_SO_LOCKED); 1937 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 1938 stcb->asoc.strmout[i].chunks_on_queues = 0; 1939#if defined(SCTP_DETAILED_STR_STATS) 1940 for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) { 1941 asoc->strmout[i].abandoned_sent[j] = 0; 1942 asoc->strmout[i].abandoned_unsent[j] = 0; 1943 } 1944#else 1945 asoc->strmout[i].abandoned_sent[0] = 0; 1946 asoc->strmout[i].abandoned_unsent[0] = 0; 1947#endif 1948 stcb->asoc.strmout[i].stream_no = i; 1949 stcb->asoc.strmout[i].next_sequence_send = 0; 1950 stcb->asoc.strmout[i].last_msg_incomplete = 0; 1951 } 1952 /* process the INIT-ACK info (my info) */ 1953 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 1954 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1955 1956 /* pull from vtag hash */ 1957 LIST_REMOVE(stcb, sctp_asocs); 1958 /* re-insert to new vtag position */ 1959 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, 1960 SCTP_BASE_INFO(hashasocmark))]; 1961 /* 1962 * put it in the bucket in the vtag hash of assoc's for the 1963 * system 1964 */ 1965 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 1966 1967 SCTP_TCB_SEND_UNLOCK(stcb); 1968 SCTP_INP_WUNLOCK(stcb->sctp_ep); 1969 SCTP_INP_INFO_WUNLOCK(); 1970#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1971 SCTP_SOCKET_UNLOCK(so, 1); 1972#endif 1973 asoc->total_flight = 0; 1974 asoc->total_flight_count = 0; 1975 /* process the INIT info (peer's info) */ 1976 retval = sctp_process_init(init_cp, stcb); 1977 if (retval < 0) { 1978 if (how_indx < sizeof(asoc->cookie_how)) 1979 asoc->cookie_how[how_indx] = 13; 1980 1981 return (NULL); 1982 } 1983 /* 1984 * since we did not send a HB make sure we don't double 1985 * things 1986 */ 1987 net->hb_responded = 1; 1988 1989 if (sctp_load_addresses_from_init(stcb, m, 1990 init_offset + sizeof(struct sctp_init_chunk), 1991 initack_offset, src, dst, init_src)) { 1992 if (how_indx < sizeof(asoc->cookie_how)) 1993 asoc->cookie_how[how_indx] = 14; 1994 1995 return (NULL); 1996 } 1997 /* respond with a COOKIE-ACK */ 1998 sctp_stop_all_cookie_timers(stcb); 1999 sctp_toss_old_cookies(stcb, asoc); 2000 sctp_send_cookie_ack(stcb); 2001 if (how_indx < sizeof(asoc->cookie_how)) 2002 asoc->cookie_how[how_indx] = 15; 2003 2004 return (stcb); 2005 } 2006 if (how_indx < sizeof(asoc->cookie_how)) 2007 asoc->cookie_how[how_indx] = 16; 2008 /* all other cases... */ 2009 return (NULL); 2010} 2011 2012 2013/* 2014 * handle a state cookie for a new association m: input packet mbuf chain-- 2015 * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf 2016 * and the cookie signature does not exist offset: offset into mbuf to the 2017 * cookie-echo chunk length: length of the cookie chunk to: where the init 2018 * was from returns a new TCB 2019 */ 2020static struct sctp_tcb * 2021sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 2022 struct sockaddr *src, struct sockaddr *dst, 2023 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 2024 struct sctp_inpcb *inp, struct sctp_nets **netp, 2025 struct sockaddr *init_src, int *notification, 2026 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2027 uint8_t use_mflowid, uint32_t mflowid, 2028 uint32_t vrf_id, uint16_t port) 2029{ 2030 struct sctp_tcb *stcb; 2031 struct sctp_init_chunk *init_cp, init_buf; 2032 struct sctp_init_ack_chunk *initack_cp, initack_buf; 2033 struct sockaddr_storage sa_store; 2034 struct sockaddr *initack_src = (struct sockaddr *)&sa_store; 2035 struct sctp_association *asoc; 2036 int init_offset, initack_offset, initack_limit; 2037 int retval; 2038 int error = 0; 2039 uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE]; 2040 2041#ifdef INET 2042 struct sockaddr_in *sin; 2043 2044#endif 2045#ifdef INET6 2046 struct sockaddr_in6 *sin6; 2047 2048#endif 2049#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2050 struct socket *so; 2051 2052 so = SCTP_INP_SO(inp); 2053#endif 2054 2055 /* 2056 * find and validate the INIT chunk in the cookie (peer's info) the 2057 * INIT should start after the cookie-echo header struct (chunk 2058 * header, state cookie header struct) 2059 */ 2060 init_offset = offset + sizeof(struct sctp_cookie_echo_chunk); 2061 init_cp = (struct sctp_init_chunk *) 2062 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 2063 (uint8_t *) & init_buf); 2064 if (init_cp == NULL) { 2065 /* could not pull a INIT chunk in cookie */ 2066 SCTPDBG(SCTP_DEBUG_INPUT1, 2067 "process_cookie_new: could not pull INIT chunk hdr\n"); 2068 return (NULL); 2069 } 2070 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 2071 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n"); 2072 return (NULL); 2073 } 2074 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 2075 /* 2076 * find and validate the INIT-ACK chunk in the cookie (my info) the 2077 * INIT-ACK follows the INIT chunk 2078 */ 2079 initack_cp = (struct sctp_init_ack_chunk *) 2080 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 2081 (uint8_t *) & initack_buf); 2082 if (initack_cp == NULL) { 2083 /* could not pull INIT-ACK chunk in cookie */ 2084 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n"); 2085 return (NULL); 2086 } 2087 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 2088 return (NULL); 2089 } 2090 /* 2091 * NOTE: We can't use the INIT_ACK's chk_length to determine the 2092 * "initack_limit" value. This is because the chk_length field 2093 * includes the length of the cookie, but the cookie is omitted when 2094 * the INIT and INIT_ACK are tacked onto the cookie... 2095 */ 2096 initack_limit = offset + cookie_len; 2097 2098 /* 2099 * now that we know the INIT/INIT-ACK are in place, create a new TCB 2100 * and popluate 2101 */ 2102 2103 /* 2104 * Here we do a trick, we set in NULL for the proc/thread argument. 2105 * We do this since in effect we only use the p argument when the 2106 * socket is unbound and we must do an implicit bind. Since we are 2107 * getting a cookie, we cannot be unbound. 2108 */ 2109 stcb = sctp_aloc_assoc(inp, init_src, &error, 2110 ntohl(initack_cp->init.initiate_tag), vrf_id, 2111 (struct thread *)NULL 2112 ); 2113 if (stcb == NULL) { 2114 struct mbuf *op_err; 2115 2116 /* memory problem? */ 2117 SCTPDBG(SCTP_DEBUG_INPUT1, 2118 "process_cookie_new: no room for another TCB!\n"); 2119 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2120 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2121 src, dst, sh, op_err, 2122 use_mflowid, mflowid, 2123 vrf_id, port); 2124 return (NULL); 2125 } 2126 /* get the correct sctp_nets */ 2127 if (netp) 2128 *netp = sctp_findnet(stcb, init_src); 2129 2130 asoc = &stcb->asoc; 2131 /* get scope variables out of cookie */ 2132 asoc->scope.ipv4_local_scope = cookie->ipv4_scope; 2133 asoc->scope.site_scope = cookie->site_scope; 2134 asoc->scope.local_scope = cookie->local_scope; 2135 asoc->scope.loopback_scope = cookie->loopback_scope; 2136 2137 if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) || 2138 (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) { 2139 struct mbuf *op_err; 2140 2141 /* 2142 * Houston we have a problem. The EP changed while the 2143 * cookie was in flight. Only recourse is to abort the 2144 * association. 2145 */ 2146 atomic_add_int(&stcb->asoc.refcnt, 1); 2147 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2148 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2149 src, dst, sh, op_err, 2150 use_mflowid, mflowid, 2151 vrf_id, port); 2152#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2153 SCTP_TCB_UNLOCK(stcb); 2154 SCTP_SOCKET_LOCK(so, 1); 2155 SCTP_TCB_LOCK(stcb); 2156#endif 2157 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2158 SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 2159#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2160 SCTP_SOCKET_UNLOCK(so, 1); 2161#endif 2162 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2163 return (NULL); 2164 } 2165 /* process the INIT-ACK info (my info) */ 2166 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 2167 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 2168 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 2169 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 2170 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 2171 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 2172 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 2173 asoc->str_reset_seq_in = asoc->init_seq_number; 2174 2175 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 2176 2177 /* process the INIT info (peer's info) */ 2178 if (netp) 2179 retval = sctp_process_init(init_cp, stcb); 2180 else 2181 retval = 0; 2182 if (retval < 0) { 2183 atomic_add_int(&stcb->asoc.refcnt, 1); 2184#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2185 SCTP_TCB_UNLOCK(stcb); 2186 SCTP_SOCKET_LOCK(so, 1); 2187 SCTP_TCB_LOCK(stcb); 2188#endif 2189 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 2190#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2191 SCTP_SOCKET_UNLOCK(so, 1); 2192#endif 2193 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2194 return (NULL); 2195 } 2196 /* load all addresses */ 2197 if (sctp_load_addresses_from_init(stcb, m, 2198 init_offset + sizeof(struct sctp_init_chunk), initack_offset, 2199 src, dst, init_src)) { 2200 atomic_add_int(&stcb->asoc.refcnt, 1); 2201#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2202 SCTP_TCB_UNLOCK(stcb); 2203 SCTP_SOCKET_LOCK(so, 1); 2204 SCTP_TCB_LOCK(stcb); 2205#endif 2206 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_17); 2207#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2208 SCTP_SOCKET_UNLOCK(so, 1); 2209#endif 2210 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2211 return (NULL); 2212 } 2213 /* 2214 * verify any preceding AUTH chunk that was skipped 2215 */ 2216 /* pull the local authentication parameters from the cookie/init-ack */ 2217 sctp_auth_get_cookie_params(stcb, m, 2218 initack_offset + sizeof(struct sctp_init_ack_chunk), 2219 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk))); 2220 if (auth_skipped) { 2221 struct sctp_auth_chunk *auth; 2222 2223 auth = (struct sctp_auth_chunk *) 2224 sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf); 2225 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) { 2226 /* auth HMAC failed, dump the assoc and packet */ 2227 SCTPDBG(SCTP_DEBUG_AUTH1, 2228 "COOKIE-ECHO: AUTH failed\n"); 2229 atomic_add_int(&stcb->asoc.refcnt, 1); 2230#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2231 SCTP_TCB_UNLOCK(stcb); 2232 SCTP_SOCKET_LOCK(so, 1); 2233 SCTP_TCB_LOCK(stcb); 2234#endif 2235 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_18); 2236#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2237 SCTP_SOCKET_UNLOCK(so, 1); 2238#endif 2239 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2240 return (NULL); 2241 } else { 2242 /* remaining chunks checked... good to go */ 2243 stcb->asoc.authenticated = 1; 2244 } 2245 } 2246 /* update current state */ 2247 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2248 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 2249 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2250 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2251 stcb->sctp_ep, stcb, asoc->primary_destination); 2252 } 2253 sctp_stop_all_cookie_timers(stcb); 2254 SCTP_STAT_INCR_COUNTER32(sctps_passiveestab); 2255 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2256 2257 /* 2258 * if we're doing ASCONFs, check to see if we have any new local 2259 * addresses that need to get added to the peer (eg. addresses 2260 * changed while cookie echo in flight). This needs to be done 2261 * after we go to the OPEN state to do the correct asconf 2262 * processing. else, make sure we have the correct addresses in our 2263 * lists 2264 */ 2265 2266 /* warning, we re-use sin, sin6, sa_store here! */ 2267 /* pull in local_address (our "from" address) */ 2268 switch (cookie->laddr_type) { 2269#ifdef INET 2270 case SCTP_IPV4_ADDRESS: 2271 /* source addr is IPv4 */ 2272 sin = (struct sockaddr_in *)initack_src; 2273 memset(sin, 0, sizeof(*sin)); 2274 sin->sin_family = AF_INET; 2275 sin->sin_len = sizeof(struct sockaddr_in); 2276 sin->sin_addr.s_addr = cookie->laddress[0]; 2277 break; 2278#endif 2279#ifdef INET6 2280 case SCTP_IPV6_ADDRESS: 2281 /* source addr is IPv6 */ 2282 sin6 = (struct sockaddr_in6 *)initack_src; 2283 memset(sin6, 0, sizeof(*sin6)); 2284 sin6->sin6_family = AF_INET6; 2285 sin6->sin6_len = sizeof(struct sockaddr_in6); 2286 sin6->sin6_scope_id = cookie->scope_id; 2287 memcpy(&sin6->sin6_addr, cookie->laddress, 2288 sizeof(sin6->sin6_addr)); 2289 break; 2290#endif 2291 default: 2292 atomic_add_int(&stcb->asoc.refcnt, 1); 2293#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2294 SCTP_TCB_UNLOCK(stcb); 2295 SCTP_SOCKET_LOCK(so, 1); 2296 SCTP_TCB_LOCK(stcb); 2297#endif 2298 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_19); 2299#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2300 SCTP_SOCKET_UNLOCK(so, 1); 2301#endif 2302 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2303 return (NULL); 2304 } 2305 2306 /* set up to notify upper layer */ 2307 *notification = SCTP_NOTIFY_ASSOC_UP; 2308 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2309 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 2310 (inp->sctp_socket->so_qlimit == 0)) { 2311 /* 2312 * This is an endpoint that called connect() how it got a 2313 * cookie that is NEW is a bit of a mystery. It must be that 2314 * the INIT was sent, but before it got there.. a complete 2315 * INIT/INIT-ACK/COOKIE arrived. But of course then it 2316 * should have went to the other code.. not here.. oh well.. 2317 * a bit of protection is worth having.. 2318 */ 2319 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2320#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2321 atomic_add_int(&stcb->asoc.refcnt, 1); 2322 SCTP_TCB_UNLOCK(stcb); 2323 SCTP_SOCKET_LOCK(so, 1); 2324 SCTP_TCB_LOCK(stcb); 2325 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2326 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2327 SCTP_SOCKET_UNLOCK(so, 1); 2328 return (NULL); 2329 } 2330#endif 2331 soisconnected(stcb->sctp_socket); 2332#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2333 SCTP_SOCKET_UNLOCK(so, 1); 2334#endif 2335 } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 2336 (inp->sctp_socket->so_qlimit)) { 2337 /* 2338 * We don't want to do anything with this one. Since it is 2339 * the listening guy. The timer will get started for 2340 * accepted connections in the caller. 2341 */ 2342 ; 2343 } 2344 /* since we did not send a HB make sure we don't double things */ 2345 if ((netp) && (*netp)) 2346 (*netp)->hb_responded = 1; 2347 2348 if (stcb->asoc.sctp_autoclose_ticks && 2349 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2350 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL); 2351 } 2352 /* calculate the RTT */ 2353 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 2354 if ((netp) && (*netp)) { 2355 (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp, 2356 &cookie->time_entered, sctp_align_unsafe_makecopy, 2357 SCTP_RTT_FROM_NON_DATA); 2358 } 2359 /* respond with a COOKIE-ACK */ 2360 sctp_send_cookie_ack(stcb); 2361 2362 /* 2363 * check the address lists for any ASCONFs that need to be sent 2364 * AFTER the cookie-ack is sent 2365 */ 2366 sctp_check_address_list(stcb, m, 2367 initack_offset + sizeof(struct sctp_init_ack_chunk), 2368 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)), 2369 initack_src, cookie->local_scope, cookie->site_scope, 2370 cookie->ipv4_scope, cookie->loopback_scope); 2371 2372 2373 return (stcb); 2374} 2375 2376/* 2377 * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e 2378 * we NEED to make sure we are not already using the vtag. If so we 2379 * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit! 2380 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag, 2381 SCTP_BASE_INFO(hashasocmark))]; 2382 LIST_FOREACH(stcb, head, sctp_asocs) { 2383 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep)) { 2384 -- SEND ABORT - TRY AGAIN -- 2385 } 2386 } 2387*/ 2388 2389/* 2390 * handles a COOKIE-ECHO message stcb: modified to either a new or left as 2391 * existing (non-NULL) TCB 2392 */ 2393static struct mbuf * 2394sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset, 2395 struct sockaddr *src, struct sockaddr *dst, 2396 struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp, 2397 struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp, 2398 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2399 struct sctp_tcb **locked_tcb, 2400 uint8_t use_mflowid, uint32_t mflowid, 2401 uint32_t vrf_id, uint16_t port) 2402{ 2403 struct sctp_state_cookie *cookie; 2404 struct sctp_tcb *l_stcb = *stcb; 2405 struct sctp_inpcb *l_inp; 2406 struct sockaddr *to; 2407 struct sctp_pcb *ep; 2408 struct mbuf *m_sig; 2409 uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE]; 2410 uint8_t *sig; 2411 uint8_t cookie_ok = 0; 2412 unsigned int sig_offset, cookie_offset; 2413 unsigned int cookie_len; 2414 struct timeval now; 2415 struct timeval time_expires; 2416 int notification = 0; 2417 struct sctp_nets *netl; 2418 int had_a_existing_tcb = 0; 2419 int send_int_conf = 0; 2420 2421#ifdef INET 2422 struct sockaddr_in sin; 2423 2424#endif 2425#ifdef INET6 2426 struct sockaddr_in6 sin6; 2427 2428#endif 2429 2430 SCTPDBG(SCTP_DEBUG_INPUT2, 2431 "sctp_handle_cookie: handling COOKIE-ECHO\n"); 2432 2433 if (inp_p == NULL) { 2434 return (NULL); 2435 } 2436 cookie = &cp->cookie; 2437 cookie_offset = offset + sizeof(struct sctp_chunkhdr); 2438 cookie_len = ntohs(cp->ch.chunk_length); 2439 2440 if ((cookie->peerport != sh->src_port) && 2441 (cookie->myport != sh->dest_port) && 2442 (cookie->my_vtag != sh->v_tag)) { 2443 /* 2444 * invalid ports or bad tag. Note that we always leave the 2445 * v_tag in the header in network order and when we stored 2446 * it in the my_vtag slot we also left it in network order. 2447 * This maintains the match even though it may be in the 2448 * opposite byte order of the machine :-> 2449 */ 2450 return (NULL); 2451 } 2452 if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) + 2453 sizeof(struct sctp_init_chunk) + 2454 sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) { 2455 /* cookie too small */ 2456 return (NULL); 2457 } 2458 /* 2459 * split off the signature into its own mbuf (since it should not be 2460 * calculated in the sctp_hmac_m() call). 2461 */ 2462 sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE; 2463 m_sig = m_split(m, sig_offset, M_NOWAIT); 2464 if (m_sig == NULL) { 2465 /* out of memory or ?? */ 2466 return (NULL); 2467 } 2468#ifdef SCTP_MBUF_LOGGING 2469 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 2470 struct mbuf *mat; 2471 2472 for (mat = m_sig; mat; mat = SCTP_BUF_NEXT(mat)) { 2473 if (SCTP_BUF_IS_EXTENDED(mat)) { 2474 sctp_log_mb(mat, SCTP_MBUF_SPLIT); 2475 } 2476 } 2477 } 2478#endif 2479 2480 /* 2481 * compute the signature/digest for the cookie 2482 */ 2483 ep = &(*inp_p)->sctp_ep; 2484 l_inp = *inp_p; 2485 if (l_stcb) { 2486 SCTP_TCB_UNLOCK(l_stcb); 2487 } 2488 SCTP_INP_RLOCK(l_inp); 2489 if (l_stcb) { 2490 SCTP_TCB_LOCK(l_stcb); 2491 } 2492 /* which cookie is it? */ 2493 if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) && 2494 (ep->current_secret_number != ep->last_secret_number)) { 2495 /* it's the old cookie */ 2496 (void)sctp_hmac_m(SCTP_HMAC, 2497 (uint8_t *) ep->secret_key[(int)ep->last_secret_number], 2498 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2499 } else { 2500 /* it's the current cookie */ 2501 (void)sctp_hmac_m(SCTP_HMAC, 2502 (uint8_t *) ep->secret_key[(int)ep->current_secret_number], 2503 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2504 } 2505 /* get the signature */ 2506 SCTP_INP_RUNLOCK(l_inp); 2507 sig = (uint8_t *) sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *) & tmp_sig); 2508 if (sig == NULL) { 2509 /* couldn't find signature */ 2510 sctp_m_freem(m_sig); 2511 return (NULL); 2512 } 2513 /* compare the received digest with the computed digest */ 2514 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) { 2515 /* try the old cookie? */ 2516 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) && 2517 (ep->current_secret_number != ep->last_secret_number)) { 2518 /* compute digest with old */ 2519 (void)sctp_hmac_m(SCTP_HMAC, 2520 (uint8_t *) ep->secret_key[(int)ep->last_secret_number], 2521 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2522 /* compare */ 2523 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0) 2524 cookie_ok = 1; 2525 } 2526 } else { 2527 cookie_ok = 1; 2528 } 2529 2530 /* 2531 * Now before we continue we must reconstruct our mbuf so that 2532 * normal processing of any other chunks will work. 2533 */ 2534 { 2535 struct mbuf *m_at; 2536 2537 m_at = m; 2538 while (SCTP_BUF_NEXT(m_at) != NULL) { 2539 m_at = SCTP_BUF_NEXT(m_at); 2540 } 2541 SCTP_BUF_NEXT(m_at) = m_sig; 2542 } 2543 2544 if (cookie_ok == 0) { 2545 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n"); 2546 SCTPDBG(SCTP_DEBUG_INPUT2, 2547 "offset = %u, cookie_offset = %u, sig_offset = %u\n", 2548 (uint32_t) offset, cookie_offset, sig_offset); 2549 return (NULL); 2550 } 2551 /* 2552 * check the cookie timestamps to be sure it's not stale 2553 */ 2554 (void)SCTP_GETTIME_TIMEVAL(&now); 2555 /* Expire time is in Ticks, so we convert to seconds */ 2556 time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life); 2557 time_expires.tv_usec = cookie->time_entered.tv_usec; 2558 /* 2559 * TODO sctp_constants.h needs alternative time macros when _KERNEL 2560 * is undefined. 2561 */ 2562 if (timevalcmp(&now, &time_expires, >)) { 2563 /* cookie is stale! */ 2564 struct mbuf *op_err; 2565 struct sctp_stale_cookie_msg *scm; 2566 uint32_t tim; 2567 2568 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_stale_cookie_msg), 2569 0, M_NOWAIT, 1, MT_DATA); 2570 if (op_err == NULL) { 2571 /* FOOBAR */ 2572 return (NULL); 2573 } 2574 /* Set the len */ 2575 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_stale_cookie_msg); 2576 scm = mtod(op_err, struct sctp_stale_cookie_msg *); 2577 scm->ph.param_type = htons(SCTP_CAUSE_STALE_COOKIE); 2578 scm->ph.param_length = htons((sizeof(struct sctp_paramhdr) + 2579 (sizeof(uint32_t)))); 2580 /* seconds to usec */ 2581 tim = (now.tv_sec - time_expires.tv_sec) * 1000000; 2582 /* add in usec */ 2583 if (tim == 0) 2584 tim = now.tv_usec - cookie->time_entered.tv_usec; 2585 scm->time_usec = htonl(tim); 2586 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 2587 use_mflowid, mflowid, 2588 vrf_id, port); 2589 return (NULL); 2590 } 2591 /* 2592 * Now we must see with the lookup address if we have an existing 2593 * asoc. This will only happen if we were in the COOKIE-WAIT state 2594 * and a INIT collided with us and somewhere the peer sent the 2595 * cookie on another address besides the single address our assoc 2596 * had for him. In this case we will have one of the tie-tags set at 2597 * least AND the address field in the cookie can be used to look it 2598 * up. 2599 */ 2600 to = NULL; 2601 switch (cookie->addr_type) { 2602#ifdef INET6 2603 case SCTP_IPV6_ADDRESS: 2604 memset(&sin6, 0, sizeof(sin6)); 2605 sin6.sin6_family = AF_INET6; 2606 sin6.sin6_len = sizeof(sin6); 2607 sin6.sin6_port = sh->src_port; 2608 sin6.sin6_scope_id = cookie->scope_id; 2609 memcpy(&sin6.sin6_addr.s6_addr, cookie->address, 2610 sizeof(sin6.sin6_addr.s6_addr)); 2611 to = (struct sockaddr *)&sin6; 2612 break; 2613#endif 2614#ifdef INET 2615 case SCTP_IPV4_ADDRESS: 2616 memset(&sin, 0, sizeof(sin)); 2617 sin.sin_family = AF_INET; 2618 sin.sin_len = sizeof(sin); 2619 sin.sin_port = sh->src_port; 2620 sin.sin_addr.s_addr = cookie->address[0]; 2621 to = (struct sockaddr *)&sin; 2622 break; 2623#endif 2624 default: 2625 /* This should not happen */ 2626 return (NULL); 2627 } 2628 if ((*stcb == NULL) && to) { 2629 /* Yep, lets check */ 2630 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL); 2631 if (*stcb == NULL) { 2632 /* 2633 * We should have only got back the same inp. If we 2634 * got back a different ep we have a problem. The 2635 * original findep got back l_inp and now 2636 */ 2637 if (l_inp != *inp_p) { 2638 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n"); 2639 } 2640 } else { 2641 if (*locked_tcb == NULL) { 2642 /* 2643 * In this case we found the assoc only 2644 * after we locked the create lock. This 2645 * means we are in a colliding case and we 2646 * must make sure that we unlock the tcb if 2647 * its one of the cases where we throw away 2648 * the incoming packets. 2649 */ 2650 *locked_tcb = *stcb; 2651 2652 /* 2653 * We must also increment the inp ref count 2654 * since the ref_count flags was set when we 2655 * did not find the TCB, now we found it 2656 * which reduces the refcount.. we must 2657 * raise it back out to balance it all :-) 2658 */ 2659 SCTP_INP_INCR_REF((*stcb)->sctp_ep); 2660 if ((*stcb)->sctp_ep != l_inp) { 2661 SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n", 2662 (void *)(*stcb)->sctp_ep, (void *)l_inp); 2663 } 2664 } 2665 } 2666 } 2667 if (to == NULL) { 2668 return (NULL); 2669 } 2670 cookie_len -= SCTP_SIGNATURE_SIZE; 2671 if (*stcb == NULL) { 2672 /* this is the "normal" case... get a new TCB */ 2673 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh, 2674 cookie, cookie_len, *inp_p, 2675 netp, to, ¬ification, 2676 auth_skipped, auth_offset, auth_len, 2677 use_mflowid, mflowid, 2678 vrf_id, port); 2679 } else { 2680 /* this is abnormal... cookie-echo on existing TCB */ 2681 had_a_existing_tcb = 1; 2682 *stcb = sctp_process_cookie_existing(m, iphlen, offset, 2683 src, dst, sh, 2684 cookie, cookie_len, *inp_p, *stcb, netp, to, 2685 ¬ification, auth_skipped, auth_offset, auth_len, 2686 use_mflowid, mflowid, 2687 vrf_id, port); 2688 } 2689 2690 if (*stcb == NULL) { 2691 /* still no TCB... must be bad cookie-echo */ 2692 return (NULL); 2693 } 2694 if ((*netp != NULL) && (use_mflowid != 0)) { 2695 (*netp)->flowid = mflowid; 2696#ifdef INVARIANTS 2697 (*netp)->flowidset = 1; 2698#endif 2699 } 2700 /* 2701 * Ok, we built an association so confirm the address we sent the 2702 * INIT-ACK to. 2703 */ 2704 netl = sctp_findnet(*stcb, to); 2705 /* 2706 * This code should in theory NOT run but 2707 */ 2708 if (netl == NULL) { 2709 /* TSNH! Huh, why do I need to add this address here? */ 2710 if (sctp_add_remote_addr(*stcb, to, NULL, SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) { 2711 return (NULL); 2712 } 2713 netl = sctp_findnet(*stcb, to); 2714 } 2715 if (netl) { 2716 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) { 2717 netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 2718 (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL, 2719 netl); 2720 send_int_conf = 1; 2721 } 2722 } 2723 sctp_start_net_timers(*stcb); 2724 if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) { 2725 if (!had_a_existing_tcb || 2726 (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) { 2727 /* 2728 * If we have a NEW cookie or the connect never 2729 * reached the connected state during collision we 2730 * must do the TCP accept thing. 2731 */ 2732 struct socket *so, *oso; 2733 struct sctp_inpcb *inp; 2734 2735 if (notification == SCTP_NOTIFY_ASSOC_RESTART) { 2736 /* 2737 * For a restart we will keep the same 2738 * socket, no need to do anything. I THINK!! 2739 */ 2740 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2741 if (send_int_conf) { 2742 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2743 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2744 } 2745 return (m); 2746 } 2747 oso = (*inp_p)->sctp_socket; 2748 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2749 SCTP_TCB_UNLOCK((*stcb)); 2750 CURVNET_SET(oso->so_vnet); 2751 so = sonewconn(oso, 0 2752 ); 2753 CURVNET_RESTORE(); 2754 SCTP_TCB_LOCK((*stcb)); 2755 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2756 2757 if (so == NULL) { 2758 struct mbuf *op_err; 2759 2760#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2761 struct socket *pcb_so; 2762 2763#endif 2764 /* Too many sockets */ 2765 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n"); 2766 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2767 sctp_abort_association(*inp_p, NULL, m, iphlen, 2768 src, dst, sh, op_err, 2769 use_mflowid, mflowid, 2770 vrf_id, port); 2771#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2772 pcb_so = SCTP_INP_SO(*inp_p); 2773 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2774 SCTP_TCB_UNLOCK((*stcb)); 2775 SCTP_SOCKET_LOCK(pcb_so, 1); 2776 SCTP_TCB_LOCK((*stcb)); 2777 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2778#endif 2779 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_20); 2780#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2781 SCTP_SOCKET_UNLOCK(pcb_so, 1); 2782#endif 2783 return (NULL); 2784 } 2785 inp = (struct sctp_inpcb *)so->so_pcb; 2786 SCTP_INP_INCR_REF(inp); 2787 /* 2788 * We add the unbound flag here so that if we get an 2789 * soabort() before we get the move_pcb done, we 2790 * will properly cleanup. 2791 */ 2792 inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE | 2793 SCTP_PCB_FLAGS_CONNECTED | 2794 SCTP_PCB_FLAGS_IN_TCPPOOL | 2795 SCTP_PCB_FLAGS_UNBOUND | 2796 (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) | 2797 SCTP_PCB_FLAGS_DONT_WAKE); 2798 inp->sctp_features = (*inp_p)->sctp_features; 2799 inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features; 2800 inp->sctp_socket = so; 2801 inp->sctp_frag_point = (*inp_p)->sctp_frag_point; 2802 inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off; 2803 inp->ecn_supported = (*inp_p)->ecn_supported; 2804 inp->prsctp_supported = (*inp_p)->prsctp_supported; 2805 inp->auth_supported = (*inp_p)->auth_supported; 2806 inp->asconf_supported = (*inp_p)->asconf_supported; 2807 inp->reconfig_supported = (*inp_p)->reconfig_supported; 2808 inp->nrsack_supported = (*inp_p)->nrsack_supported; 2809 inp->pktdrop_supported = (*inp_p)->pktdrop_supported; 2810 inp->partial_delivery_point = (*inp_p)->partial_delivery_point; 2811 inp->sctp_context = (*inp_p)->sctp_context; 2812 inp->local_strreset_support = (*inp_p)->local_strreset_support; 2813 inp->inp_starting_point_for_iterator = NULL; 2814 /* 2815 * copy in the authentication parameters from the 2816 * original endpoint 2817 */ 2818 if (inp->sctp_ep.local_hmacs) 2819 sctp_free_hmaclist(inp->sctp_ep.local_hmacs); 2820 inp->sctp_ep.local_hmacs = 2821 sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs); 2822 if (inp->sctp_ep.local_auth_chunks) 2823 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks); 2824 inp->sctp_ep.local_auth_chunks = 2825 sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks); 2826 2827 /* 2828 * Now we must move it from one hash table to 2829 * another and get the tcb in the right place. 2830 */ 2831 2832 /* 2833 * This is where the one-2-one socket is put into 2834 * the accept state waiting for the accept! 2835 */ 2836 if (*stcb) { 2837 (*stcb)->asoc.state |= SCTP_STATE_IN_ACCEPT_QUEUE; 2838 } 2839 sctp_move_pcb_and_assoc(*inp_p, inp, *stcb); 2840 2841 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2842 SCTP_TCB_UNLOCK((*stcb)); 2843 2844 sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb, 2845 0); 2846 SCTP_TCB_LOCK((*stcb)); 2847 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2848 2849 2850 /* 2851 * now we must check to see if we were aborted while 2852 * the move was going on and the lock/unlock 2853 * happened. 2854 */ 2855 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 2856 /* 2857 * yep it was, we leave the assoc attached 2858 * to the socket since the sctp_inpcb_free() 2859 * call will send an abort for us. 2860 */ 2861 SCTP_INP_DECR_REF(inp); 2862 return (NULL); 2863 } 2864 SCTP_INP_DECR_REF(inp); 2865 /* Switch over to the new guy */ 2866 *inp_p = inp; 2867 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2868 if (send_int_conf) { 2869 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2870 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2871 } 2872 /* 2873 * Pull it from the incomplete queue and wake the 2874 * guy 2875 */ 2876#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2877 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2878 SCTP_TCB_UNLOCK((*stcb)); 2879 SCTP_SOCKET_LOCK(so, 1); 2880#endif 2881 soisconnected(so); 2882#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2883 SCTP_TCB_LOCK((*stcb)); 2884 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2885 SCTP_SOCKET_UNLOCK(so, 1); 2886#endif 2887 return (m); 2888 } 2889 } 2890 if (notification) { 2891 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2892 } 2893 if (send_int_conf) { 2894 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2895 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2896 } 2897 return (m); 2898} 2899 2900static void 2901sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED, 2902 struct sctp_tcb *stcb, struct sctp_nets *net) 2903{ 2904 /* cp must not be used, others call this without a c-ack :-) */ 2905 struct sctp_association *asoc; 2906 2907 SCTPDBG(SCTP_DEBUG_INPUT2, 2908 "sctp_handle_cookie_ack: handling COOKIE-ACK\n"); 2909 if (stcb == NULL) 2910 return; 2911 2912 asoc = &stcb->asoc; 2913 2914 sctp_stop_all_cookie_timers(stcb); 2915 /* process according to association state */ 2916 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) { 2917 /* state change only needed when I am in right state */ 2918 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2919 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 2920 sctp_start_net_timers(stcb); 2921 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2922 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2923 stcb->sctp_ep, stcb, asoc->primary_destination); 2924 2925 } 2926 /* update RTO */ 2927 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 2928 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2929 if (asoc->overall_error_count == 0) { 2930 net->RTO = sctp_calculate_rto(stcb, asoc, net, 2931 &asoc->time_entered, sctp_align_safe_nocopy, 2932 SCTP_RTT_FROM_NON_DATA); 2933 } 2934 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 2935 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2936 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2937 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 2938#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2939 struct socket *so; 2940 2941#endif 2942 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2943#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2944 so = SCTP_INP_SO(stcb->sctp_ep); 2945 atomic_add_int(&stcb->asoc.refcnt, 1); 2946 SCTP_TCB_UNLOCK(stcb); 2947 SCTP_SOCKET_LOCK(so, 1); 2948 SCTP_TCB_LOCK(stcb); 2949 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2950#endif 2951 if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) { 2952 soisconnected(stcb->sctp_socket); 2953 } 2954#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2955 SCTP_SOCKET_UNLOCK(so, 1); 2956#endif 2957 } 2958 /* 2959 * since we did not send a HB make sure we don't double 2960 * things 2961 */ 2962 net->hb_responded = 1; 2963 2964 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2965 /* 2966 * We don't need to do the asconf thing, nor hb or 2967 * autoclose if the socket is closed. 2968 */ 2969 goto closed_socket; 2970 } 2971 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 2972 stcb, net); 2973 2974 2975 if (stcb->asoc.sctp_autoclose_ticks && 2976 sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2977 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 2978 stcb->sctp_ep, stcb, NULL); 2979 } 2980 /* 2981 * send ASCONF if parameters are pending and ASCONFs are 2982 * allowed (eg. addresses changed when init/cookie echo were 2983 * in flight) 2984 */ 2985 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) && 2986 (stcb->asoc.asconf_supported == 1) && 2987 (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) { 2988#ifdef SCTP_TIMER_BASED_ASCONF 2989 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, 2990 stcb->sctp_ep, stcb, 2991 stcb->asoc.primary_destination); 2992#else 2993 sctp_send_asconf(stcb, stcb->asoc.primary_destination, 2994 SCTP_ADDR_NOT_LOCKED); 2995#endif 2996 } 2997 } 2998closed_socket: 2999 /* Toss the cookie if I can */ 3000 sctp_toss_old_cookies(stcb, asoc); 3001 if (!TAILQ_EMPTY(&asoc->sent_queue)) { 3002 /* Restart the timer if we have pending data */ 3003 struct sctp_tmit_chunk *chk; 3004 3005 chk = TAILQ_FIRST(&asoc->sent_queue); 3006 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 3007 } 3008} 3009 3010static void 3011sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp, 3012 struct sctp_tcb *stcb) 3013{ 3014 struct sctp_nets *net; 3015 struct sctp_tmit_chunk *lchk; 3016 struct sctp_ecne_chunk bkup; 3017 uint8_t override_bit; 3018 uint32_t tsn, window_data_tsn; 3019 int len; 3020 unsigned int pkt_cnt; 3021 3022 len = ntohs(cp->ch.chunk_length); 3023 if ((len != sizeof(struct sctp_ecne_chunk)) && 3024 (len != sizeof(struct old_sctp_ecne_chunk))) { 3025 return; 3026 } 3027 if (len == sizeof(struct old_sctp_ecne_chunk)) { 3028 /* Its the old format */ 3029 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk)); 3030 bkup.num_pkts_since_cwr = htonl(1); 3031 cp = &bkup; 3032 } 3033 SCTP_STAT_INCR(sctps_recvecne); 3034 tsn = ntohl(cp->tsn); 3035 pkt_cnt = ntohl(cp->num_pkts_since_cwr); 3036 lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead); 3037 if (lchk == NULL) { 3038 window_data_tsn = stcb->asoc.sending_seq - 1; 3039 } else { 3040 window_data_tsn = lchk->rec.data.TSN_seq; 3041 } 3042 3043 /* Find where it was sent to if possible. */ 3044 net = NULL; 3045 TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) { 3046 if (lchk->rec.data.TSN_seq == tsn) { 3047 net = lchk->whoTo; 3048 net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send; 3049 break; 3050 } 3051 if (SCTP_TSN_GT(lchk->rec.data.TSN_seq, tsn)) { 3052 break; 3053 } 3054 } 3055 if (net == NULL) { 3056 /* 3057 * What to do. A previous send of a CWR was possibly lost. 3058 * See how old it is, we may have it marked on the actual 3059 * net. 3060 */ 3061 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 3062 if (tsn == net->last_cwr_tsn) { 3063 /* Found him, send it off */ 3064 break; 3065 } 3066 } 3067 if (net == NULL) { 3068 /* 3069 * If we reach here, we need to send a special CWR 3070 * that says hey, we did this a long time ago and 3071 * you lost the response. 3072 */ 3073 net = TAILQ_FIRST(&stcb->asoc.nets); 3074 if (net == NULL) { 3075 /* TSNH */ 3076 return; 3077 } 3078 override_bit = SCTP_CWR_REDUCE_OVERRIDE; 3079 } else { 3080 override_bit = 0; 3081 } 3082 } else { 3083 override_bit = 0; 3084 } 3085 if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) && 3086 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 3087 /* 3088 * JRS - Use the congestion control given in the pluggable 3089 * CC module 3090 */ 3091 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt); 3092 /* 3093 * We reduce once every RTT. So we will only lower cwnd at 3094 * the next sending seq i.e. the window_data_tsn 3095 */ 3096 net->cwr_window_tsn = window_data_tsn; 3097 net->ecn_ce_pkt_cnt += pkt_cnt; 3098 net->lost_cnt = pkt_cnt; 3099 net->last_cwr_tsn = tsn; 3100 } else { 3101 override_bit |= SCTP_CWR_IN_SAME_WINDOW; 3102 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) && 3103 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 3104 /* 3105 * Another loss in the same window update how many 3106 * marks/packets lost we have had. 3107 */ 3108 int cnt = 1; 3109 3110 if (pkt_cnt > net->lost_cnt) { 3111 /* Should be the case */ 3112 cnt = (pkt_cnt - net->lost_cnt); 3113 net->ecn_ce_pkt_cnt += cnt; 3114 } 3115 net->lost_cnt = pkt_cnt; 3116 net->last_cwr_tsn = tsn; 3117 /* 3118 * Most CC functions will ignore this call, since we 3119 * are in-window yet of the initial CE the peer saw. 3120 */ 3121 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt); 3122 } 3123 } 3124 /* 3125 * We always send a CWR this way if our previous one was lost our 3126 * peer will get an update, or if it is not time again to reduce we 3127 * still get the cwr to the peer. Note we set the override when we 3128 * could not find the TSN on the chunk or the destination network. 3129 */ 3130 sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit); 3131} 3132 3133static void 3134sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net) 3135{ 3136 /* 3137 * Here we get a CWR from the peer. We must look in the outqueue and 3138 * make sure that we have a covered ECNE in the control chunk part. 3139 * If so remove it. 3140 */ 3141 struct sctp_tmit_chunk *chk; 3142 struct sctp_ecne_chunk *ecne; 3143 int override; 3144 uint32_t cwr_tsn; 3145 3146 cwr_tsn = ntohl(cp->tsn); 3147 3148 override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE; 3149 TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) { 3150 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) { 3151 continue; 3152 } 3153 if ((override == 0) && (chk->whoTo != net)) { 3154 /* Must be from the right src unless override is set */ 3155 continue; 3156 } 3157 ecne = mtod(chk->data, struct sctp_ecne_chunk *); 3158 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) { 3159 /* this covers this ECNE, we can remove it */ 3160 stcb->asoc.ecn_echo_cnt_onq--; 3161 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, 3162 sctp_next); 3163 if (chk->data) { 3164 sctp_m_freem(chk->data); 3165 chk->data = NULL; 3166 } 3167 stcb->asoc.ctrl_queue_cnt--; 3168 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3169 if (override == 0) { 3170 break; 3171 } 3172 } 3173 } 3174} 3175 3176static void 3177sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED, 3178 struct sctp_tcb *stcb, struct sctp_nets *net) 3179{ 3180 struct sctp_association *asoc; 3181 3182#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3183 struct socket *so; 3184 3185#endif 3186 3187 SCTPDBG(SCTP_DEBUG_INPUT2, 3188 "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n"); 3189 if (stcb == NULL) 3190 return; 3191 3192 asoc = &stcb->asoc; 3193 /* process according to association state */ 3194 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 3195 /* unexpected SHUTDOWN-COMPLETE... so ignore... */ 3196 SCTPDBG(SCTP_DEBUG_INPUT2, 3197 "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n"); 3198 SCTP_TCB_UNLOCK(stcb); 3199 return; 3200 } 3201 /* notify upper layer protocol */ 3202 if (stcb->sctp_socket) { 3203 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 3204 } 3205#ifdef INVARIANTS 3206 if (!TAILQ_EMPTY(&asoc->send_queue) || 3207 !TAILQ_EMPTY(&asoc->sent_queue) || 3208 !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 3209 panic("Queues are not empty when handling SHUTDOWN-COMPLETE"); 3210 } 3211#endif 3212 /* stop the timer */ 3213 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_22); 3214 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 3215 /* free the TCB */ 3216 SCTPDBG(SCTP_DEBUG_INPUT2, 3217 "sctp_handle_shutdown_complete: calls free-asoc\n"); 3218#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3219 so = SCTP_INP_SO(stcb->sctp_ep); 3220 atomic_add_int(&stcb->asoc.refcnt, 1); 3221 SCTP_TCB_UNLOCK(stcb); 3222 SCTP_SOCKET_LOCK(so, 1); 3223 SCTP_TCB_LOCK(stcb); 3224 atomic_subtract_int(&stcb->asoc.refcnt, 1); 3225#endif 3226 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_23); 3227#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3228 SCTP_SOCKET_UNLOCK(so, 1); 3229#endif 3230 return; 3231} 3232 3233static int 3234process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc, 3235 struct sctp_nets *net, uint8_t flg) 3236{ 3237 switch (desc->chunk_type) { 3238 case SCTP_DATA: 3239 /* find the tsn to resend (possibly */ 3240 { 3241 uint32_t tsn; 3242 struct sctp_tmit_chunk *tp1; 3243 3244 tsn = ntohl(desc->tsn_ifany); 3245 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3246 if (tp1->rec.data.TSN_seq == tsn) { 3247 /* found it */ 3248 break; 3249 } 3250 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, tsn)) { 3251 /* not found */ 3252 tp1 = NULL; 3253 break; 3254 } 3255 } 3256 if (tp1 == NULL) { 3257 /* 3258 * Do it the other way , aka without paying 3259 * attention to queue seq order. 3260 */ 3261 SCTP_STAT_INCR(sctps_pdrpdnfnd); 3262 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3263 if (tp1->rec.data.TSN_seq == tsn) { 3264 /* found it */ 3265 break; 3266 } 3267 } 3268 } 3269 if (tp1 == NULL) { 3270 SCTP_STAT_INCR(sctps_pdrptsnnf); 3271 } 3272 if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) { 3273 uint8_t *ddp; 3274 3275 if (((flg & SCTP_BADCRC) == 0) && 3276 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3277 return (0); 3278 } 3279 if ((stcb->asoc.peers_rwnd == 0) && 3280 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3281 SCTP_STAT_INCR(sctps_pdrpdiwnp); 3282 return (0); 3283 } 3284 if (stcb->asoc.peers_rwnd == 0 && 3285 (flg & SCTP_FROM_MIDDLE_BOX)) { 3286 SCTP_STAT_INCR(sctps_pdrpdizrw); 3287 return (0); 3288 } 3289 ddp = (uint8_t *) (mtod(tp1->data, caddr_t)+ 3290 sizeof(struct sctp_data_chunk)); 3291 { 3292 unsigned int iii; 3293 3294 for (iii = 0; iii < sizeof(desc->data_bytes); 3295 iii++) { 3296 if (ddp[iii] != desc->data_bytes[iii]) { 3297 SCTP_STAT_INCR(sctps_pdrpbadd); 3298 return (-1); 3299 } 3300 } 3301 } 3302 3303 if (tp1->do_rtt) { 3304 /* 3305 * this guy had a RTO calculation 3306 * pending on it, cancel it 3307 */ 3308 if (tp1->whoTo->rto_needed == 0) { 3309 tp1->whoTo->rto_needed = 1; 3310 } 3311 tp1->do_rtt = 0; 3312 } 3313 SCTP_STAT_INCR(sctps_pdrpmark); 3314 if (tp1->sent != SCTP_DATAGRAM_RESEND) 3315 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3316 /* 3317 * mark it as if we were doing a FR, since 3318 * we will be getting gap ack reports behind 3319 * the info from the router. 3320 */ 3321 tp1->rec.data.doing_fast_retransmit = 1; 3322 /* 3323 * mark the tsn with what sequences can 3324 * cause a new FR. 3325 */ 3326 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) { 3327 tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq; 3328 } else { 3329 tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq; 3330 } 3331 3332 /* restart the timer */ 3333 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3334 stcb, tp1->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_24); 3335 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3336 stcb, tp1->whoTo); 3337 3338 /* fix counts and things */ 3339 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 3340 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP, 3341 tp1->whoTo->flight_size, 3342 tp1->book_size, 3343 (uintptr_t) stcb, 3344 tp1->rec.data.TSN_seq); 3345 } 3346 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3347 sctp_flight_size_decrease(tp1); 3348 sctp_total_flight_decrease(stcb, tp1); 3349 } 3350 tp1->sent = SCTP_DATAGRAM_RESEND; 3351 } { 3352 /* audit code */ 3353 unsigned int audit; 3354 3355 audit = 0; 3356 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3357 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3358 audit++; 3359 } 3360 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue, 3361 sctp_next) { 3362 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3363 audit++; 3364 } 3365 if (audit != stcb->asoc.sent_queue_retran_cnt) { 3366 SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n", 3367 audit, stcb->asoc.sent_queue_retran_cnt); 3368#ifndef SCTP_AUDITING_ENABLED 3369 stcb->asoc.sent_queue_retran_cnt = audit; 3370#endif 3371 } 3372 } 3373 } 3374 break; 3375 case SCTP_ASCONF: 3376 { 3377 struct sctp_tmit_chunk *asconf; 3378 3379 TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue, 3380 sctp_next) { 3381 if (asconf->rec.chunk_id.id == SCTP_ASCONF) { 3382 break; 3383 } 3384 } 3385 if (asconf) { 3386 if (asconf->sent != SCTP_DATAGRAM_RESEND) 3387 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3388 asconf->sent = SCTP_DATAGRAM_RESEND; 3389 asconf->snd_count--; 3390 } 3391 } 3392 break; 3393 case SCTP_INITIATION: 3394 /* resend the INIT */ 3395 stcb->asoc.dropped_special_cnt++; 3396 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) { 3397 /* 3398 * If we can get it in, in a few attempts we do 3399 * this, otherwise we let the timer fire. 3400 */ 3401 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, 3402 stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_25); 3403 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 3404 } 3405 break; 3406 case SCTP_SELECTIVE_ACK: 3407 case SCTP_NR_SELECTIVE_ACK: 3408 /* resend the sack */ 3409 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED); 3410 break; 3411 case SCTP_HEARTBEAT_REQUEST: 3412 /* resend a demand HB */ 3413 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) { 3414 /* 3415 * Only retransmit if we KNOW we wont destroy the 3416 * tcb 3417 */ 3418 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 3419 } 3420 break; 3421 case SCTP_SHUTDOWN: 3422 sctp_send_shutdown(stcb, net); 3423 break; 3424 case SCTP_SHUTDOWN_ACK: 3425 sctp_send_shutdown_ack(stcb, net); 3426 break; 3427 case SCTP_COOKIE_ECHO: 3428 { 3429 struct sctp_tmit_chunk *cookie; 3430 3431 cookie = NULL; 3432 TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, 3433 sctp_next) { 3434 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) { 3435 break; 3436 } 3437 } 3438 if (cookie) { 3439 if (cookie->sent != SCTP_DATAGRAM_RESEND) 3440 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3441 cookie->sent = SCTP_DATAGRAM_RESEND; 3442 sctp_stop_all_cookie_timers(stcb); 3443 } 3444 } 3445 break; 3446 case SCTP_COOKIE_ACK: 3447 sctp_send_cookie_ack(stcb); 3448 break; 3449 case SCTP_ASCONF_ACK: 3450 /* resend last asconf ack */ 3451 sctp_send_asconf_ack(stcb); 3452 break; 3453 case SCTP_FORWARD_CUM_TSN: 3454 send_forward_tsn(stcb, &stcb->asoc); 3455 break; 3456 /* can't do anything with these */ 3457 case SCTP_PACKET_DROPPED: 3458 case SCTP_INITIATION_ACK: /* this should not happen */ 3459 case SCTP_HEARTBEAT_ACK: 3460 case SCTP_ABORT_ASSOCIATION: 3461 case SCTP_OPERATION_ERROR: 3462 case SCTP_SHUTDOWN_COMPLETE: 3463 case SCTP_ECN_ECHO: 3464 case SCTP_ECN_CWR: 3465 default: 3466 break; 3467 } 3468 return (0); 3469} 3470 3471void 3472sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list) 3473{ 3474 uint32_t i; 3475 uint16_t temp; 3476 3477 /* 3478 * We set things to 0xffff since this is the last delivered sequence 3479 * and we will be sending in 0 after the reset. 3480 */ 3481 3482 if (number_entries) { 3483 for (i = 0; i < number_entries; i++) { 3484 temp = ntohs(list[i]); 3485 if (temp >= stcb->asoc.streamincnt) { 3486 continue; 3487 } 3488 stcb->asoc.strmin[temp].last_sequence_delivered = 0xffff; 3489 } 3490 } else { 3491 list = NULL; 3492 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3493 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff; 3494 } 3495 } 3496 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3497} 3498 3499static void 3500sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list) 3501{ 3502 uint32_t i; 3503 uint16_t temp; 3504 3505 if (number_entries > 0) { 3506 for (i = 0; i < number_entries; i++) { 3507 temp = ntohs(list[i]); 3508 if (temp >= stcb->asoc.streamoutcnt) { 3509 /* no such stream */ 3510 continue; 3511 } 3512 stcb->asoc.strmout[temp].next_sequence_send = 0; 3513 } 3514 } else { 3515 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3516 stcb->asoc.strmout[i].next_sequence_send = 0; 3517 } 3518 } 3519 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3520} 3521 3522 3523struct sctp_stream_reset_out_request * 3524sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk) 3525{ 3526 struct sctp_association *asoc; 3527 struct sctp_chunkhdr *ch; 3528 struct sctp_stream_reset_out_request *r; 3529 struct sctp_tmit_chunk *chk; 3530 int len, clen; 3531 3532 asoc = &stcb->asoc; 3533 if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 3534 asoc->stream_reset_outstanding = 0; 3535 return (NULL); 3536 } 3537 if (stcb->asoc.str_reset == NULL) { 3538 asoc->stream_reset_outstanding = 0; 3539 return (NULL); 3540 } 3541 chk = stcb->asoc.str_reset; 3542 if (chk->data == NULL) { 3543 return (NULL); 3544 } 3545 if (bchk) { 3546 /* he wants a copy of the chk pointer */ 3547 *bchk = chk; 3548 } 3549 clen = chk->send_size; 3550 ch = mtod(chk->data, struct sctp_chunkhdr *); 3551 r = (struct sctp_stream_reset_out_request *)(ch + 1); 3552 if (ntohl(r->request_seq) == seq) { 3553 /* found it */ 3554 return (r); 3555 } 3556 len = SCTP_SIZE32(ntohs(r->ph.param_length)); 3557 if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) { 3558 /* move to the next one, there can only be a max of two */ 3559 r = (struct sctp_stream_reset_out_request *)((caddr_t)r + len); 3560 if (ntohl(r->request_seq) == seq) { 3561 return (r); 3562 } 3563 } 3564 /* that seq is not here */ 3565 return (NULL); 3566} 3567 3568static void 3569sctp_clean_up_stream_reset(struct sctp_tcb *stcb) 3570{ 3571 struct sctp_association *asoc; 3572 struct sctp_tmit_chunk *chk = stcb->asoc.str_reset; 3573 3574 if (stcb->asoc.str_reset == NULL) { 3575 return; 3576 } 3577 asoc = &stcb->asoc; 3578 3579 sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_26); 3580 TAILQ_REMOVE(&asoc->control_send_queue, 3581 chk, 3582 sctp_next); 3583 if (chk->data) { 3584 sctp_m_freem(chk->data); 3585 chk->data = NULL; 3586 } 3587 asoc->ctrl_queue_cnt--; 3588 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3589 /* sa_ignore NO_NULL_CHK */ 3590 stcb->asoc.str_reset = NULL; 3591} 3592 3593 3594static int 3595sctp_handle_stream_reset_response(struct sctp_tcb *stcb, 3596 uint32_t seq, uint32_t action, 3597 struct sctp_stream_reset_response *respin) 3598{ 3599 uint16_t type; 3600 int lparm_len; 3601 struct sctp_association *asoc = &stcb->asoc; 3602 struct sctp_tmit_chunk *chk; 3603 struct sctp_stream_reset_out_request *srparam; 3604 uint32_t number_entries; 3605 3606 if (asoc->stream_reset_outstanding == 0) { 3607 /* duplicate */ 3608 return (0); 3609 } 3610 if (seq == stcb->asoc.str_reset_seq_out) { 3611 srparam = sctp_find_stream_reset(stcb, seq, &chk); 3612 if (srparam) { 3613 stcb->asoc.str_reset_seq_out++; 3614 type = ntohs(srparam->ph.param_type); 3615 lparm_len = ntohs(srparam->ph.param_length); 3616 if (type == SCTP_STR_RESET_OUT_REQUEST) { 3617 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t); 3618 asoc->stream_reset_out_is_outstanding = 0; 3619 if (asoc->stream_reset_outstanding) 3620 asoc->stream_reset_outstanding--; 3621 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3622 /* do it */ 3623 sctp_reset_out_streams(stcb, number_entries, srparam->list_of_streams); 3624 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3625 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED); 3626 } else { 3627 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED); 3628 } 3629 } else if (type == SCTP_STR_RESET_IN_REQUEST) { 3630 /* Answered my request */ 3631 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t); 3632 if (asoc->stream_reset_outstanding) 3633 asoc->stream_reset_outstanding--; 3634 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3635 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb, 3636 number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED); 3637 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3638 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb, 3639 number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED); 3640 } 3641 } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) { 3642 /* Ok we now may have more streams */ 3643 int num_stream; 3644 3645 num_stream = stcb->asoc.strm_pending_add_size; 3646 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) { 3647 /* TSNH */ 3648 num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt; 3649 } 3650 stcb->asoc.strm_pending_add_size = 0; 3651 if (asoc->stream_reset_outstanding) 3652 asoc->stream_reset_outstanding--; 3653 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3654 /* Put the new streams into effect */ 3655 stcb->asoc.streamoutcnt += num_stream; 3656 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 3657 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3658 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3659 SCTP_STREAM_CHANGE_DENIED); 3660 } else { 3661 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3662 SCTP_STREAM_CHANGE_FAILED); 3663 } 3664 } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) { 3665 if (asoc->stream_reset_outstanding) 3666 asoc->stream_reset_outstanding--; 3667 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3668 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3669 SCTP_STREAM_CHANGE_DENIED); 3670 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3671 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3672 SCTP_STREAM_CHANGE_FAILED); 3673 } 3674 } else if (type == SCTP_STR_RESET_TSN_REQUEST) { 3675 /** 3676 * a) Adopt the new in tsn. 3677 * b) reset the map 3678 * c) Adopt the new out-tsn 3679 */ 3680 struct sctp_stream_reset_response_tsn *resp; 3681 struct sctp_forward_tsn_chunk fwdtsn; 3682 int abort_flag = 0; 3683 3684 if (respin == NULL) { 3685 /* huh ? */ 3686 return (0); 3687 } 3688 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3689 resp = (struct sctp_stream_reset_response_tsn *)respin; 3690 asoc->stream_reset_outstanding--; 3691 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3692 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3693 fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1); 3694 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3695 if (abort_flag) { 3696 return (1); 3697 } 3698 stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1); 3699 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3700 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3701 } 3702 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 3703 stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn); 3704 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 3705 3706 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map; 3707 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size); 3708 3709 stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn); 3710 stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn; 3711 3712 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL); 3713 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL); 3714 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0); 3715 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3716 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3717 SCTP_ASSOC_RESET_DENIED); 3718 } else { 3719 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3720 SCTP_ASSOC_RESET_FAILED); 3721 } 3722 } 3723 /* get rid of the request and get the request flags */ 3724 if (asoc->stream_reset_outstanding == 0) { 3725 sctp_clean_up_stream_reset(stcb); 3726 } 3727 } 3728 } 3729 return (0); 3730} 3731 3732static void 3733sctp_handle_str_reset_request_in(struct sctp_tcb *stcb, 3734 struct sctp_tmit_chunk *chk, 3735 struct sctp_stream_reset_in_request *req, int trunc) 3736{ 3737 uint32_t seq; 3738 int len, i; 3739 int number_entries; 3740 uint16_t temp; 3741 3742 /* 3743 * peer wants me to send a str-reset to him for my outgoing seq's if 3744 * seq_in is right. 3745 */ 3746 struct sctp_association *asoc = &stcb->asoc; 3747 3748 seq = ntohl(req->request_seq); 3749 if (asoc->str_reset_seq_in == seq) { 3750 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3751 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3752 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3753 } else if (trunc) { 3754 /* Can't do it, since they exceeded our buffer size */ 3755 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3756 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) { 3757 len = ntohs(req->ph.param_length); 3758 number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t)); 3759 for (i = 0; i < number_entries; i++) { 3760 temp = ntohs(req->list_of_streams[i]); 3761 req->list_of_streams[i] = temp; 3762 } 3763 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3764 sctp_add_stream_reset_out(chk, number_entries, req->list_of_streams, 3765 asoc->str_reset_seq_out, 3766 seq, (asoc->sending_seq - 1)); 3767 asoc->stream_reset_out_is_outstanding = 1; 3768 asoc->str_reset = chk; 3769 sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo); 3770 stcb->asoc.stream_reset_outstanding++; 3771 } else { 3772 /* Can't do it, since we have sent one out */ 3773 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 3774 } 3775 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3776 asoc->str_reset_seq_in++; 3777 } else if (asoc->str_reset_seq_in - 1 == seq) { 3778 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3779 } else if (asoc->str_reset_seq_in - 2 == seq) { 3780 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3781 } else { 3782 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3783 } 3784} 3785 3786static int 3787sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb, 3788 struct sctp_tmit_chunk *chk, 3789 struct sctp_stream_reset_tsn_request *req) 3790{ 3791 /* reset all in and out and update the tsn */ 3792 /* 3793 * A) reset my str-seq's on in and out. B) Select a receive next, 3794 * and set cum-ack to it. Also process this selected number as a 3795 * fwd-tsn as well. C) set in the response my next sending seq. 3796 */ 3797 struct sctp_forward_tsn_chunk fwdtsn; 3798 struct sctp_association *asoc = &stcb->asoc; 3799 int abort_flag = 0; 3800 uint32_t seq; 3801 3802 seq = ntohl(req->request_seq); 3803 if (asoc->str_reset_seq_in == seq) { 3804 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3805 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 3806 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3807 } else { 3808 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3809 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3810 fwdtsn.ch.chunk_flags = 0; 3811 fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1); 3812 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3813 if (abort_flag) { 3814 return (1); 3815 } 3816 asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA; 3817 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3818 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3819 } 3820 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map; 3821 asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1; 3822 memset(asoc->mapping_array, 0, asoc->mapping_array_size); 3823 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 3824 memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size); 3825 atomic_add_int(&asoc->sending_seq, 1); 3826 /* save off historical data for retrans */ 3827 asoc->last_sending_seq[1] = asoc->last_sending_seq[0]; 3828 asoc->last_sending_seq[0] = asoc->sending_seq; 3829 asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0]; 3830 asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn; 3831 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL); 3832 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL); 3833 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3834 sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0); 3835 } 3836 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3837 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3838 asoc->str_reset_seq_in++; 3839 } else if (asoc->str_reset_seq_in - 1 == seq) { 3840 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3841 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3842 } else if (asoc->str_reset_seq_in - 2 == seq) { 3843 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1], 3844 asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]); 3845 } else { 3846 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3847 } 3848 return (0); 3849} 3850 3851static void 3852sctp_handle_str_reset_request_out(struct sctp_tcb *stcb, 3853 struct sctp_tmit_chunk *chk, 3854 struct sctp_stream_reset_out_request *req, int trunc) 3855{ 3856 uint32_t seq, tsn; 3857 int number_entries, len; 3858 struct sctp_association *asoc = &stcb->asoc; 3859 3860 seq = ntohl(req->request_seq); 3861 3862 /* now if its not a duplicate we process it */ 3863 if (asoc->str_reset_seq_in == seq) { 3864 len = ntohs(req->ph.param_length); 3865 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t)); 3866 /* 3867 * the sender is resetting, handle the list issue.. we must 3868 * a) verify if we can do the reset, if so no problem b) If 3869 * we can't do the reset we must copy the request. c) queue 3870 * it, and setup the data in processor to trigger it off 3871 * when needed and dequeue all the queued data. 3872 */ 3873 tsn = ntohl(req->send_reset_at_tsn); 3874 3875 /* move the reset action back one */ 3876 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3877 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3878 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3879 } else if (trunc) { 3880 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3881 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) { 3882 /* we can do it now */ 3883 sctp_reset_in_stream(stcb, number_entries, req->list_of_streams); 3884 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3885 } else { 3886 /* 3887 * we must queue it up and thus wait for the TSN's 3888 * to arrive that are at or before tsn 3889 */ 3890 struct sctp_stream_reset_list *liste; 3891 int siz; 3892 3893 siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t)); 3894 SCTP_MALLOC(liste, struct sctp_stream_reset_list *, 3895 siz, SCTP_M_STRESET); 3896 if (liste == NULL) { 3897 /* gak out of memory */ 3898 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3899 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3900 return; 3901 } 3902 liste->tsn = tsn; 3903 liste->number_entries = number_entries; 3904 memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t)); 3905 TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp); 3906 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3907 } 3908 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3909 asoc->str_reset_seq_in++; 3910 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3911 /* 3912 * one seq back, just echo back last action since my 3913 * response was lost. 3914 */ 3915 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3916 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3917 /* 3918 * two seq back, just echo back last action since my 3919 * response was lost. 3920 */ 3921 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3922 } else { 3923 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3924 } 3925} 3926 3927static void 3928sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 3929 struct sctp_stream_reset_add_strm *str_add) 3930{ 3931 /* 3932 * Peer is requesting to add more streams. If its within our 3933 * max-streams we will allow it. 3934 */ 3935 uint32_t num_stream, i; 3936 uint32_t seq; 3937 struct sctp_association *asoc = &stcb->asoc; 3938 struct sctp_queued_to_read *ctl, *nctl; 3939 3940 /* Get the number. */ 3941 seq = ntohl(str_add->request_seq); 3942 num_stream = ntohs(str_add->number_of_streams); 3943 /* Now what would be the new total? */ 3944 if (asoc->str_reset_seq_in == seq) { 3945 num_stream += stcb->asoc.streamincnt; 3946 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3947 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 3948 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3949 } else if ((num_stream > stcb->asoc.max_inbound_streams) || 3950 (num_stream > 0xffff)) { 3951 /* We must reject it they ask for to many */ 3952 denied: 3953 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3954 } else { 3955 /* Ok, we can do that :-) */ 3956 struct sctp_stream_in *oldstrm; 3957 3958 /* save off the old */ 3959 oldstrm = stcb->asoc.strmin; 3960 SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *, 3961 (num_stream * sizeof(struct sctp_stream_in)), 3962 SCTP_M_STRMI); 3963 if (stcb->asoc.strmin == NULL) { 3964 stcb->asoc.strmin = oldstrm; 3965 goto denied; 3966 } 3967 /* copy off the old data */ 3968 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3969 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 3970 stcb->asoc.strmin[i].stream_no = i; 3971 stcb->asoc.strmin[i].last_sequence_delivered = oldstrm[i].last_sequence_delivered; 3972 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started; 3973 /* now anything on those queues? */ 3974 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next, nctl) { 3975 TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next); 3976 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next); 3977 } 3978 } 3979 /* Init the new streams */ 3980 for (i = stcb->asoc.streamincnt; i < num_stream; i++) { 3981 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 3982 stcb->asoc.strmin[i].stream_no = i; 3983 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff; 3984 stcb->asoc.strmin[i].delivery_started = 0; 3985 } 3986 SCTP_FREE(oldstrm, SCTP_M_STRMI); 3987 /* update the size */ 3988 stcb->asoc.streamincnt = num_stream; 3989 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3990 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 3991 } 3992 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3993 asoc->str_reset_seq_in++; 3994 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3995 /* 3996 * one seq back, just echo back last action since my 3997 * response was lost. 3998 */ 3999 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4000 } else if ((asoc->str_reset_seq_in - 2) == seq) { 4001 /* 4002 * two seq back, just echo back last action since my 4003 * response was lost. 4004 */ 4005 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 4006 } else { 4007 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 4008 4009 } 4010} 4011 4012static void 4013sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 4014 struct sctp_stream_reset_add_strm *str_add) 4015{ 4016 /* 4017 * Peer is requesting to add more streams. If its within our 4018 * max-streams we will allow it. 4019 */ 4020 uint16_t num_stream; 4021 uint32_t seq; 4022 struct sctp_association *asoc = &stcb->asoc; 4023 4024 /* Get the number. */ 4025 seq = ntohl(str_add->request_seq); 4026 num_stream = ntohs(str_add->number_of_streams); 4027 /* Now what would be the new total? */ 4028 if (asoc->str_reset_seq_in == seq) { 4029 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 4030 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 4031 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4032 } else if (stcb->asoc.stream_reset_outstanding) { 4033 /* We must reject it we have something pending */ 4034 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 4035 } else { 4036 /* Ok, we can do that :-) */ 4037 int mychk; 4038 4039 mychk = stcb->asoc.streamoutcnt; 4040 mychk += num_stream; 4041 if (mychk < 0x10000) { 4042 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 4043 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 0, 1, num_stream, 0, 1)) { 4044 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4045 } 4046 } else { 4047 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4048 } 4049 } 4050 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]); 4051 asoc->str_reset_seq_in++; 4052 } else if ((asoc->str_reset_seq_in - 1) == seq) { 4053 /* 4054 * one seq back, just echo back last action since my 4055 * response was lost. 4056 */ 4057 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4058 } else if ((asoc->str_reset_seq_in - 2) == seq) { 4059 /* 4060 * two seq back, just echo back last action since my 4061 * response was lost. 4062 */ 4063 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 4064 } else { 4065 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 4066 } 4067} 4068 4069#ifdef __GNUC__ 4070__attribute__((noinline)) 4071#endif 4072 static int 4073 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset, 4074 struct sctp_chunkhdr *ch_req) 4075{ 4076 int chk_length, param_len, ptype; 4077 struct sctp_paramhdr pstore; 4078 uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE]; 4079 uint32_t seq = 0; 4080 int num_req = 0; 4081 int trunc = 0; 4082 struct sctp_tmit_chunk *chk; 4083 struct sctp_chunkhdr *ch; 4084 struct sctp_paramhdr *ph; 4085 int ret_code = 0; 4086 int num_param = 0; 4087 4088 /* now it may be a reset or a reset-response */ 4089 chk_length = ntohs(ch_req->chunk_length); 4090 4091 /* setup for adding the response */ 4092 sctp_alloc_a_chunk(stcb, chk); 4093 if (chk == NULL) { 4094 return (ret_code); 4095 } 4096 chk->rec.chunk_id.id = SCTP_STREAM_RESET; 4097 chk->rec.chunk_id.can_take_data = 0; 4098 chk->asoc = &stcb->asoc; 4099 chk->no_fr_allowed = 0; 4100 chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr); 4101 chk->book_size_scale = 0; 4102 chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA); 4103 if (chk->data == NULL) { 4104strres_nochunk: 4105 if (chk->data) { 4106 sctp_m_freem(chk->data); 4107 chk->data = NULL; 4108 } 4109 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 4110 return (ret_code); 4111 } 4112 SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD); 4113 4114 /* setup chunk parameters */ 4115 chk->sent = SCTP_DATAGRAM_UNSENT; 4116 chk->snd_count = 0; 4117 chk->whoTo = NULL; 4118 4119 ch = mtod(chk->data, struct sctp_chunkhdr *); 4120 ch->chunk_type = SCTP_STREAM_RESET; 4121 ch->chunk_flags = 0; 4122 ch->chunk_length = htons(chk->send_size); 4123 SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size); 4124 offset += sizeof(struct sctp_chunkhdr); 4125 while ((size_t)chk_length >= sizeof(struct sctp_stream_reset_tsn_request)) { 4126 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *) & pstore); 4127 if (ph == NULL) 4128 break; 4129 param_len = ntohs(ph->param_length); 4130 if (param_len < (int)sizeof(struct sctp_stream_reset_tsn_request)) { 4131 /* bad param */ 4132 break; 4133 } 4134 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, (int)sizeof(cstore)), 4135 (uint8_t *) & cstore); 4136 ptype = ntohs(ph->param_type); 4137 num_param++; 4138 if (param_len > (int)sizeof(cstore)) { 4139 trunc = 1; 4140 } else { 4141 trunc = 0; 4142 } 4143 if (num_param > SCTP_MAX_RESET_PARAMS) { 4144 /* hit the max of parameters already sorry.. */ 4145 break; 4146 } 4147 if (ptype == SCTP_STR_RESET_OUT_REQUEST) { 4148 struct sctp_stream_reset_out_request *req_out; 4149 4150 req_out = (struct sctp_stream_reset_out_request *)ph; 4151 num_req++; 4152 if (stcb->asoc.stream_reset_outstanding) { 4153 seq = ntohl(req_out->response_seq); 4154 if (seq == stcb->asoc.str_reset_seq_out) { 4155 /* implicit ack */ 4156 (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL); 4157 } 4158 } 4159 sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc); 4160 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) { 4161 struct sctp_stream_reset_add_strm *str_add; 4162 4163 str_add = (struct sctp_stream_reset_add_strm *)ph; 4164 num_req++; 4165 sctp_handle_str_reset_add_strm(stcb, chk, str_add); 4166 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) { 4167 struct sctp_stream_reset_add_strm *str_add; 4168 4169 str_add = (struct sctp_stream_reset_add_strm *)ph; 4170 num_req++; 4171 sctp_handle_str_reset_add_out_strm(stcb, chk, str_add); 4172 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) { 4173 struct sctp_stream_reset_in_request *req_in; 4174 4175 num_req++; 4176 req_in = (struct sctp_stream_reset_in_request *)ph; 4177 sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc); 4178 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) { 4179 struct sctp_stream_reset_tsn_request *req_tsn; 4180 4181 num_req++; 4182 req_tsn = (struct sctp_stream_reset_tsn_request *)ph; 4183 if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) { 4184 ret_code = 1; 4185 goto strres_nochunk; 4186 } 4187 /* no more */ 4188 break; 4189 } else if (ptype == SCTP_STR_RESET_RESPONSE) { 4190 struct sctp_stream_reset_response *resp; 4191 uint32_t result; 4192 4193 resp = (struct sctp_stream_reset_response *)ph; 4194 seq = ntohl(resp->response_seq); 4195 result = ntohl(resp->result); 4196 if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) { 4197 ret_code = 1; 4198 goto strres_nochunk; 4199 } 4200 } else { 4201 break; 4202 } 4203 offset += SCTP_SIZE32(param_len); 4204 chk_length -= SCTP_SIZE32(param_len); 4205 } 4206 if (num_req == 0) { 4207 /* we have no response free the stuff */ 4208 goto strres_nochunk; 4209 } 4210 /* ok we have a chunk to link in */ 4211 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, 4212 chk, 4213 sctp_next); 4214 stcb->asoc.ctrl_queue_cnt++; 4215 return (ret_code); 4216} 4217 4218/* 4219 * Handle a router or endpoints report of a packet loss, there are two ways 4220 * to handle this, either we get the whole packet and must disect it 4221 * ourselves (possibly with truncation and or corruption) or it is a summary 4222 * from a middle box that did the disectting for us. 4223 */ 4224static void 4225sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp, 4226 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 4227{ 4228 uint32_t bottle_bw, on_queue; 4229 uint16_t trunc_len; 4230 unsigned int chlen; 4231 unsigned int at; 4232 struct sctp_chunk_desc desc; 4233 struct sctp_chunkhdr *ch; 4234 4235 chlen = ntohs(cp->ch.chunk_length); 4236 chlen -= sizeof(struct sctp_pktdrop_chunk); 4237 /* XXX possible chlen underflow */ 4238 if (chlen == 0) { 4239 ch = NULL; 4240 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) 4241 SCTP_STAT_INCR(sctps_pdrpbwrpt); 4242 } else { 4243 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr)); 4244 chlen -= sizeof(struct sctphdr); 4245 /* XXX possible chlen underflow */ 4246 memset(&desc, 0, sizeof(desc)); 4247 } 4248 trunc_len = (uint16_t) ntohs(cp->trunc_len); 4249 if (trunc_len > limit) { 4250 trunc_len = limit; 4251 } 4252 /* now the chunks themselves */ 4253 while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) { 4254 desc.chunk_type = ch->chunk_type; 4255 /* get amount we need to move */ 4256 at = ntohs(ch->chunk_length); 4257 if (at < sizeof(struct sctp_chunkhdr)) { 4258 /* corrupt chunk, maybe at the end? */ 4259 SCTP_STAT_INCR(sctps_pdrpcrupt); 4260 break; 4261 } 4262 if (trunc_len == 0) { 4263 /* we are supposed to have all of it */ 4264 if (at > chlen) { 4265 /* corrupt skip it */ 4266 SCTP_STAT_INCR(sctps_pdrpcrupt); 4267 break; 4268 } 4269 } else { 4270 /* is there enough of it left ? */ 4271 if (desc.chunk_type == SCTP_DATA) { 4272 if (chlen < (sizeof(struct sctp_data_chunk) + 4273 sizeof(desc.data_bytes))) { 4274 break; 4275 } 4276 } else { 4277 if (chlen < sizeof(struct sctp_chunkhdr)) { 4278 break; 4279 } 4280 } 4281 } 4282 if (desc.chunk_type == SCTP_DATA) { 4283 /* can we get out the tsn? */ 4284 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4285 SCTP_STAT_INCR(sctps_pdrpmbda); 4286 4287 if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) { 4288 /* yep */ 4289 struct sctp_data_chunk *dcp; 4290 uint8_t *ddp; 4291 unsigned int iii; 4292 4293 dcp = (struct sctp_data_chunk *)ch; 4294 ddp = (uint8_t *) (dcp + 1); 4295 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) { 4296 desc.data_bytes[iii] = ddp[iii]; 4297 } 4298 desc.tsn_ifany = dcp->dp.tsn; 4299 } else { 4300 /* nope we are done. */ 4301 SCTP_STAT_INCR(sctps_pdrpnedat); 4302 break; 4303 } 4304 } else { 4305 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4306 SCTP_STAT_INCR(sctps_pdrpmbct); 4307 } 4308 4309 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) { 4310 SCTP_STAT_INCR(sctps_pdrppdbrk); 4311 break; 4312 } 4313 if (SCTP_SIZE32(at) > chlen) { 4314 break; 4315 } 4316 chlen -= SCTP_SIZE32(at); 4317 if (chlen < sizeof(struct sctp_chunkhdr)) { 4318 /* done, none left */ 4319 break; 4320 } 4321 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at)); 4322 } 4323 /* Now update any rwnd --- possibly */ 4324 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) { 4325 /* From a peer, we get a rwnd report */ 4326 uint32_t a_rwnd; 4327 4328 SCTP_STAT_INCR(sctps_pdrpfehos); 4329 4330 bottle_bw = ntohl(cp->bottle_bw); 4331 on_queue = ntohl(cp->current_onq); 4332 if (bottle_bw && on_queue) { 4333 /* a rwnd report is in here */ 4334 if (bottle_bw > on_queue) 4335 a_rwnd = bottle_bw - on_queue; 4336 else 4337 a_rwnd = 0; 4338 4339 if (a_rwnd == 0) 4340 stcb->asoc.peers_rwnd = 0; 4341 else { 4342 if (a_rwnd > stcb->asoc.total_flight) { 4343 stcb->asoc.peers_rwnd = 4344 a_rwnd - stcb->asoc.total_flight; 4345 } else { 4346 stcb->asoc.peers_rwnd = 0; 4347 } 4348 if (stcb->asoc.peers_rwnd < 4349 stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 4350 /* SWS sender side engages */ 4351 stcb->asoc.peers_rwnd = 0; 4352 } 4353 } 4354 } 4355 } else { 4356 SCTP_STAT_INCR(sctps_pdrpfmbox); 4357 } 4358 4359 /* now middle boxes in sat networks get a cwnd bump */ 4360 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) && 4361 (stcb->asoc.sat_t3_loss_recovery == 0) && 4362 (stcb->asoc.sat_network)) { 4363 /* 4364 * This is debateable but for sat networks it makes sense 4365 * Note if a T3 timer has went off, we will prohibit any 4366 * changes to cwnd until we exit the t3 loss recovery. 4367 */ 4368 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb, 4369 net, cp, &bottle_bw, &on_queue); 4370 } 4371} 4372 4373/* 4374 * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to 4375 * still contain IP/SCTP header - stcb: is the tcb found for this packet - 4376 * offset: offset into the mbuf chain to first chunkhdr - length: is the 4377 * length of the complete packet outputs: - length: modified to remaining 4378 * length after control processing - netp: modified to new sctp_nets after 4379 * cookie-echo processing - return NULL to discard the packet (ie. no asoc, 4380 * bad packet,...) otherwise return the tcb for this packet 4381 */ 4382#ifdef __GNUC__ 4383__attribute__((noinline)) 4384#endif 4385 static struct sctp_tcb * 4386 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length, 4387 struct sockaddr *src, struct sockaddr *dst, 4388 struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp, 4389 struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen, 4390 uint8_t use_mflowid, uint32_t mflowid, 4391 uint32_t vrf_id, uint16_t port) 4392{ 4393 struct sctp_association *asoc; 4394 struct mbuf *op_err; 4395 char msg[SCTP_DIAG_INFO_LEN]; 4396 uint32_t vtag_in; 4397 int num_chunks = 0; /* number of control chunks processed */ 4398 uint32_t chk_length; 4399 int ret; 4400 int abort_no_unlock = 0; 4401 int ecne_seen = 0; 4402 4403 /* 4404 * How big should this be, and should it be alloc'd? Lets try the 4405 * d-mtu-ceiling for now (2k) and that should hopefully work ... 4406 * until we get into jumbo grams and such.. 4407 */ 4408 uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE]; 4409 struct sctp_tcb *locked_tcb = stcb; 4410 int got_auth = 0; 4411 uint32_t auth_offset = 0, auth_len = 0; 4412 int auth_skipped = 0; 4413 int asconf_cnt = 0; 4414 4415#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4416 struct socket *so; 4417 4418#endif 4419 4420 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n", 4421 iphlen, *offset, length, (void *)stcb); 4422 4423 /* validate chunk header length... */ 4424 if (ntohs(ch->chunk_length) < sizeof(*ch)) { 4425 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n", 4426 ntohs(ch->chunk_length)); 4427 if (locked_tcb) { 4428 SCTP_TCB_UNLOCK(locked_tcb); 4429 } 4430 return (NULL); 4431 } 4432 /* 4433 * validate the verification tag 4434 */ 4435 vtag_in = ntohl(sh->v_tag); 4436 4437 if (locked_tcb) { 4438 SCTP_TCB_LOCK_ASSERT(locked_tcb); 4439 } 4440 if (ch->chunk_type == SCTP_INITIATION) { 4441 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n", 4442 ntohs(ch->chunk_length), vtag_in); 4443 if (vtag_in != 0) { 4444 /* protocol error- silently discard... */ 4445 SCTP_STAT_INCR(sctps_badvtag); 4446 if (locked_tcb) { 4447 SCTP_TCB_UNLOCK(locked_tcb); 4448 } 4449 return (NULL); 4450 } 4451 } else if (ch->chunk_type != SCTP_COOKIE_ECHO) { 4452 /* 4453 * If there is no stcb, skip the AUTH chunk and process 4454 * later after a stcb is found (to validate the lookup was 4455 * valid. 4456 */ 4457 if ((ch->chunk_type == SCTP_AUTHENTICATION) && 4458 (stcb == NULL) && 4459 (inp->auth_supported == 1)) { 4460 /* save this chunk for later processing */ 4461 auth_skipped = 1; 4462 auth_offset = *offset; 4463 auth_len = ntohs(ch->chunk_length); 4464 4465 /* (temporarily) move past this chunk */ 4466 *offset += SCTP_SIZE32(auth_len); 4467 if (*offset >= length) { 4468 /* no more data left in the mbuf chain */ 4469 *offset = length; 4470 if (locked_tcb) { 4471 SCTP_TCB_UNLOCK(locked_tcb); 4472 } 4473 return (NULL); 4474 } 4475 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4476 sizeof(struct sctp_chunkhdr), chunk_buf); 4477 } 4478 if (ch == NULL) { 4479 /* Help */ 4480 *offset = length; 4481 if (locked_tcb) { 4482 SCTP_TCB_UNLOCK(locked_tcb); 4483 } 4484 return (NULL); 4485 } 4486 if (ch->chunk_type == SCTP_COOKIE_ECHO) { 4487 goto process_control_chunks; 4488 } 4489 /* 4490 * first check if it's an ASCONF with an unknown src addr we 4491 * need to look inside to find the association 4492 */ 4493 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) { 4494 struct sctp_chunkhdr *asconf_ch = ch; 4495 uint32_t asconf_offset = 0, asconf_len = 0; 4496 4497 /* inp's refcount may be reduced */ 4498 SCTP_INP_INCR_REF(inp); 4499 4500 asconf_offset = *offset; 4501 do { 4502 asconf_len = ntohs(asconf_ch->chunk_length); 4503 if (asconf_len < sizeof(struct sctp_asconf_paramhdr)) 4504 break; 4505 stcb = sctp_findassociation_ep_asconf(m, 4506 *offset, 4507 dst, 4508 sh, &inp, netp, vrf_id); 4509 if (stcb != NULL) 4510 break; 4511 asconf_offset += SCTP_SIZE32(asconf_len); 4512 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset, 4513 sizeof(struct sctp_chunkhdr), chunk_buf); 4514 } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF); 4515 if (stcb == NULL) { 4516 /* 4517 * reduce inp's refcount if not reduced in 4518 * sctp_findassociation_ep_asconf(). 4519 */ 4520 SCTP_INP_DECR_REF(inp); 4521 } else { 4522 locked_tcb = stcb; 4523 } 4524 4525 /* now go back and verify any auth chunk to be sure */ 4526 if (auth_skipped && (stcb != NULL)) { 4527 struct sctp_auth_chunk *auth; 4528 4529 auth = (struct sctp_auth_chunk *) 4530 sctp_m_getptr(m, auth_offset, 4531 auth_len, chunk_buf); 4532 got_auth = 1; 4533 auth_skipped = 0; 4534 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, 4535 auth_offset)) { 4536 /* auth HMAC failed so dump it */ 4537 *offset = length; 4538 if (locked_tcb) { 4539 SCTP_TCB_UNLOCK(locked_tcb); 4540 } 4541 return (NULL); 4542 } else { 4543 /* remaining chunks are HMAC checked */ 4544 stcb->asoc.authenticated = 1; 4545 } 4546 } 4547 } 4548 if (stcb == NULL) { 4549 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__); 4550 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4551 msg); 4552 /* no association, so it's out of the blue... */ 4553 sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, op_err, 4554 use_mflowid, mflowid, 4555 vrf_id, port); 4556 *offset = length; 4557 if (locked_tcb) { 4558 SCTP_TCB_UNLOCK(locked_tcb); 4559 } 4560 return (NULL); 4561 } 4562 asoc = &stcb->asoc; 4563 /* ABORT and SHUTDOWN can use either v_tag... */ 4564 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) || 4565 (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) || 4566 (ch->chunk_type == SCTP_PACKET_DROPPED)) { 4567 /* Take the T-bit always into account. */ 4568 if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) && 4569 (vtag_in == asoc->my_vtag)) || 4570 (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) && 4571 (vtag_in == asoc->peer_vtag))) { 4572 /* this is valid */ 4573 } else { 4574 /* drop this packet... */ 4575 SCTP_STAT_INCR(sctps_badvtag); 4576 if (locked_tcb) { 4577 SCTP_TCB_UNLOCK(locked_tcb); 4578 } 4579 return (NULL); 4580 } 4581 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 4582 if (vtag_in != asoc->my_vtag) { 4583 /* 4584 * this could be a stale SHUTDOWN-ACK or the 4585 * peer never got the SHUTDOWN-COMPLETE and 4586 * is still hung; we have started a new asoc 4587 * but it won't complete until the shutdown 4588 * is completed 4589 */ 4590 if (locked_tcb) { 4591 SCTP_TCB_UNLOCK(locked_tcb); 4592 } 4593 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__); 4594 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4595 msg); 4596 sctp_handle_ootb(m, iphlen, *offset, src, dst, 4597 sh, inp, op_err, 4598 use_mflowid, mflowid, 4599 vrf_id, port); 4600 return (NULL); 4601 } 4602 } else { 4603 /* for all other chunks, vtag must match */ 4604 if (vtag_in != asoc->my_vtag) { 4605 /* invalid vtag... */ 4606 SCTPDBG(SCTP_DEBUG_INPUT3, 4607 "invalid vtag: %xh, expect %xh\n", 4608 vtag_in, asoc->my_vtag); 4609 SCTP_STAT_INCR(sctps_badvtag); 4610 if (locked_tcb) { 4611 SCTP_TCB_UNLOCK(locked_tcb); 4612 } 4613 *offset = length; 4614 return (NULL); 4615 } 4616 } 4617 } /* end if !SCTP_COOKIE_ECHO */ 4618 /* 4619 * process all control chunks... 4620 */ 4621 if (((ch->chunk_type == SCTP_SELECTIVE_ACK) || 4622 (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) || 4623 (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) && 4624 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) { 4625 /* implied cookie-ack.. we must have lost the ack */ 4626 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4627 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4628 stcb->asoc.overall_error_count, 4629 0, 4630 SCTP_FROM_SCTP_INPUT, 4631 __LINE__); 4632 } 4633 stcb->asoc.overall_error_count = 0; 4634 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, 4635 *netp); 4636 } 4637process_control_chunks: 4638 while (IS_SCTP_CONTROL(ch)) { 4639 /* validate chunk length */ 4640 chk_length = ntohs(ch->chunk_length); 4641 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n", 4642 ch->chunk_type, chk_length); 4643 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length); 4644 if (chk_length < sizeof(*ch) || 4645 (*offset + (int)chk_length) > length) { 4646 *offset = length; 4647 if (locked_tcb) { 4648 SCTP_TCB_UNLOCK(locked_tcb); 4649 } 4650 return (NULL); 4651 } 4652 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks); 4653 /* 4654 * INIT-ACK only gets the init ack "header" portion only 4655 * because we don't have to process the peer's COOKIE. All 4656 * others get a complete chunk. 4657 */ 4658 if ((ch->chunk_type == SCTP_INITIATION_ACK) || 4659 (ch->chunk_type == SCTP_INITIATION)) { 4660 /* get an init-ack chunk */ 4661 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4662 sizeof(struct sctp_init_ack_chunk), chunk_buf); 4663 if (ch == NULL) { 4664 *offset = length; 4665 if (locked_tcb) { 4666 SCTP_TCB_UNLOCK(locked_tcb); 4667 } 4668 return (NULL); 4669 } 4670 } else { 4671 /* For cookies and all other chunks. */ 4672 if (chk_length > sizeof(chunk_buf)) { 4673 /* 4674 * use just the size of the chunk buffer so 4675 * the front part of our chunks fit in 4676 * contiguous space up to the chunk buffer 4677 * size (508 bytes). For chunks that need to 4678 * get more than that they must use the 4679 * sctp_m_getptr() function or other means 4680 * (e.g. know how to parse mbuf chains). 4681 * Cookies do this already. 4682 */ 4683 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4684 (sizeof(chunk_buf) - 4), 4685 chunk_buf); 4686 if (ch == NULL) { 4687 *offset = length; 4688 if (locked_tcb) { 4689 SCTP_TCB_UNLOCK(locked_tcb); 4690 } 4691 return (NULL); 4692 } 4693 } else { 4694 /* We can fit it all */ 4695 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4696 chk_length, chunk_buf); 4697 if (ch == NULL) { 4698 SCTP_PRINTF("sctp_process_control: Can't get the all data....\n"); 4699 *offset = length; 4700 if (locked_tcb) { 4701 SCTP_TCB_UNLOCK(locked_tcb); 4702 } 4703 return (NULL); 4704 } 4705 } 4706 } 4707 num_chunks++; 4708 /* Save off the last place we got a control from */ 4709 if (stcb != NULL) { 4710 if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) { 4711 /* 4712 * allow last_control to be NULL if 4713 * ASCONF... ASCONF processing will find the 4714 * right net later 4715 */ 4716 if ((netp != NULL) && (*netp != NULL)) 4717 stcb->asoc.last_control_chunk_from = *netp; 4718 } 4719 } 4720#ifdef SCTP_AUDITING_ENABLED 4721 sctp_audit_log(0xB0, ch->chunk_type); 4722#endif 4723 4724 /* check to see if this chunk required auth, but isn't */ 4725 if ((stcb != NULL) && 4726 (stcb->asoc.auth_supported == 1) && 4727 sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) && 4728 !stcb->asoc.authenticated) { 4729 /* "silently" ignore */ 4730 SCTP_STAT_INCR(sctps_recvauthmissing); 4731 goto next_chunk; 4732 } 4733 switch (ch->chunk_type) { 4734 case SCTP_INITIATION: 4735 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n"); 4736 /* The INIT chunk must be the only chunk. */ 4737 if ((num_chunks > 1) || 4738 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4739 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4740 "INIT not the only chunk"); 4741 sctp_abort_association(inp, stcb, m, iphlen, 4742 src, dst, sh, op_err, 4743 use_mflowid, mflowid, 4744 vrf_id, port); 4745 *offset = length; 4746 return (NULL); 4747 } 4748 /* Honor our resource limit. */ 4749 if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) { 4750 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 4751 sctp_abort_association(inp, stcb, m, iphlen, 4752 src, dst, sh, op_err, 4753 use_mflowid, mflowid, 4754 vrf_id, port); 4755 *offset = length; 4756 return (NULL); 4757 } 4758 sctp_handle_init(m, iphlen, *offset, src, dst, sh, 4759 (struct sctp_init_chunk *)ch, inp, 4760 stcb, &abort_no_unlock, 4761 use_mflowid, mflowid, 4762 vrf_id, port); 4763 *offset = length; 4764 if ((!abort_no_unlock) && (locked_tcb)) { 4765 SCTP_TCB_UNLOCK(locked_tcb); 4766 } 4767 return (NULL); 4768 break; 4769 case SCTP_PAD_CHUNK: 4770 break; 4771 case SCTP_INITIATION_ACK: 4772 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT-ACK\n"); 4773 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4774 /* We are not interested anymore */ 4775 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4776 ; 4777 } else { 4778 if (locked_tcb != stcb) { 4779 /* Very unlikely */ 4780 SCTP_TCB_UNLOCK(locked_tcb); 4781 } 4782 *offset = length; 4783 if (stcb) { 4784#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4785 so = SCTP_INP_SO(inp); 4786 atomic_add_int(&stcb->asoc.refcnt, 1); 4787 SCTP_TCB_UNLOCK(stcb); 4788 SCTP_SOCKET_LOCK(so, 1); 4789 SCTP_TCB_LOCK(stcb); 4790 atomic_subtract_int(&stcb->asoc.refcnt, 1); 4791#endif 4792 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 4793#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4794 SCTP_SOCKET_UNLOCK(so, 1); 4795#endif 4796 } 4797 return (NULL); 4798 } 4799 } 4800 /* The INIT-ACK chunk must be the only chunk. */ 4801 if ((num_chunks > 1) || 4802 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4803 *offset = length; 4804 if (locked_tcb) { 4805 SCTP_TCB_UNLOCK(locked_tcb); 4806 } 4807 return (NULL); 4808 } 4809 if ((netp) && (*netp)) { 4810 ret = sctp_handle_init_ack(m, iphlen, *offset, 4811 src, dst, sh, 4812 (struct sctp_init_ack_chunk *)ch, 4813 stcb, *netp, 4814 &abort_no_unlock, 4815 use_mflowid, mflowid, 4816 vrf_id); 4817 } else { 4818 ret = -1; 4819 } 4820 *offset = length; 4821 if (abort_no_unlock) { 4822 return (NULL); 4823 } 4824 /* 4825 * Special case, I must call the output routine to 4826 * get the cookie echoed 4827 */ 4828 if ((stcb != NULL) && (ret == 0)) { 4829 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 4830 } 4831 if (locked_tcb) { 4832 SCTP_TCB_UNLOCK(locked_tcb); 4833 } 4834 return (NULL); 4835 break; 4836 case SCTP_SELECTIVE_ACK: 4837 { 4838 struct sctp_sack_chunk *sack; 4839 int abort_now = 0; 4840 uint32_t a_rwnd, cum_ack; 4841 uint16_t num_seg, num_dup; 4842 uint8_t flags; 4843 int offset_seg, offset_dup; 4844 4845 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK\n"); 4846 SCTP_STAT_INCR(sctps_recvsacks); 4847 if (stcb == NULL) { 4848 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing SACK chunk\n"); 4849 break; 4850 } 4851 if (chk_length < sizeof(struct sctp_sack_chunk)) { 4852 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n"); 4853 break; 4854 } 4855 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4856 /*- 4857 * If we have sent a shutdown-ack, we will pay no 4858 * attention to a sack sent in to us since 4859 * we don't care anymore. 4860 */ 4861 break; 4862 } 4863 sack = (struct sctp_sack_chunk *)ch; 4864 flags = ch->chunk_flags; 4865 cum_ack = ntohl(sack->sack.cum_tsn_ack); 4866 num_seg = ntohs(sack->sack.num_gap_ack_blks); 4867 num_dup = ntohs(sack->sack.num_dup_tsns); 4868 a_rwnd = (uint32_t) ntohl(sack->sack.a_rwnd); 4869 if (sizeof(struct sctp_sack_chunk) + 4870 num_seg * sizeof(struct sctp_gap_ack_block) + 4871 num_dup * sizeof(uint32_t) != chk_length) { 4872 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n"); 4873 break; 4874 } 4875 offset_seg = *offset + sizeof(struct sctp_sack_chunk); 4876 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 4877 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n", 4878 cum_ack, num_seg, a_rwnd); 4879 stcb->asoc.seen_a_sack_this_pkt = 1; 4880 if ((stcb->asoc.pr_sctp_cnt == 0) && 4881 (num_seg == 0) && 4882 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 4883 (stcb->asoc.saw_sack_with_frags == 0) && 4884 (stcb->asoc.saw_sack_with_nr_frags == 0) && 4885 (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) 4886 ) { 4887 /* 4888 * We have a SIMPLE sack having no 4889 * prior segments and data on sent 4890 * queue to be acked.. Use the 4891 * faster path sack processing. We 4892 * also allow window update sacks 4893 * with no missing segments to go 4894 * this way too. 4895 */ 4896 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, &abort_now, ecne_seen); 4897 } else { 4898 if (netp && *netp) 4899 sctp_handle_sack(m, offset_seg, offset_dup, stcb, 4900 num_seg, 0, num_dup, &abort_now, flags, 4901 cum_ack, a_rwnd, ecne_seen); 4902 } 4903 if (abort_now) { 4904 /* ABORT signal from sack processing */ 4905 *offset = length; 4906 return (NULL); 4907 } 4908 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 4909 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 4910 (stcb->asoc.stream_queue_cnt == 0)) { 4911 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 4912 } 4913 } 4914 break; 4915 /* 4916 * EY - nr_sack: If the received chunk is an 4917 * nr_sack chunk 4918 */ 4919 case SCTP_NR_SELECTIVE_ACK: 4920 { 4921 struct sctp_nr_sack_chunk *nr_sack; 4922 int abort_now = 0; 4923 uint32_t a_rwnd, cum_ack; 4924 uint16_t num_seg, num_nr_seg, num_dup; 4925 uint8_t flags; 4926 int offset_seg, offset_dup; 4927 4928 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK\n"); 4929 SCTP_STAT_INCR(sctps_recvsacks); 4930 if (stcb == NULL) { 4931 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing NR-SACK chunk\n"); 4932 break; 4933 } 4934 if (stcb->asoc.nrsack_supported == 0) { 4935 goto unknown_chunk; 4936 } 4937 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) { 4938 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR-SACK chunk, too small\n"); 4939 break; 4940 } 4941 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4942 /*- 4943 * If we have sent a shutdown-ack, we will pay no 4944 * attention to a sack sent in to us since 4945 * we don't care anymore. 4946 */ 4947 break; 4948 } 4949 nr_sack = (struct sctp_nr_sack_chunk *)ch; 4950 flags = ch->chunk_flags; 4951 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack); 4952 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks); 4953 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks); 4954 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns); 4955 a_rwnd = (uint32_t) ntohl(nr_sack->nr_sack.a_rwnd); 4956 if (sizeof(struct sctp_nr_sack_chunk) + 4957 (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) + 4958 num_dup * sizeof(uint32_t) != chk_length) { 4959 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n"); 4960 break; 4961 } 4962 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk); 4963 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 4964 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n", 4965 cum_ack, num_seg, a_rwnd); 4966 stcb->asoc.seen_a_sack_this_pkt = 1; 4967 if ((stcb->asoc.pr_sctp_cnt == 0) && 4968 (num_seg == 0) && (num_nr_seg == 0) && 4969 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 4970 (stcb->asoc.saw_sack_with_frags == 0) && 4971 (stcb->asoc.saw_sack_with_nr_frags == 0) && 4972 (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) { 4973 /* 4974 * We have a SIMPLE sack having no 4975 * prior segments and data on sent 4976 * queue to be acked. Use the faster 4977 * path sack processing. We also 4978 * allow window update sacks with no 4979 * missing segments to go this way 4980 * too. 4981 */ 4982 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, 4983 &abort_now, ecne_seen); 4984 } else { 4985 if (netp && *netp) 4986 sctp_handle_sack(m, offset_seg, offset_dup, stcb, 4987 num_seg, num_nr_seg, num_dup, &abort_now, flags, 4988 cum_ack, a_rwnd, ecne_seen); 4989 } 4990 if (abort_now) { 4991 /* ABORT signal from sack processing */ 4992 *offset = length; 4993 return (NULL); 4994 } 4995 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 4996 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 4997 (stcb->asoc.stream_queue_cnt == 0)) { 4998 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 4999 } 5000 } 5001 break; 5002 5003 case SCTP_HEARTBEAT_REQUEST: 5004 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n"); 5005 if ((stcb) && netp && *netp) { 5006 SCTP_STAT_INCR(sctps_recvheartbeat); 5007 sctp_send_heartbeat_ack(stcb, m, *offset, 5008 chk_length, *netp); 5009 5010 /* He's alive so give him credit */ 5011 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5012 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5013 stcb->asoc.overall_error_count, 5014 0, 5015 SCTP_FROM_SCTP_INPUT, 5016 __LINE__); 5017 } 5018 stcb->asoc.overall_error_count = 0; 5019 } 5020 break; 5021 case SCTP_HEARTBEAT_ACK: 5022 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT-ACK\n"); 5023 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) { 5024 /* Its not ours */ 5025 *offset = length; 5026 if (locked_tcb) { 5027 SCTP_TCB_UNLOCK(locked_tcb); 5028 } 5029 return (NULL); 5030 } 5031 /* He's alive so give him credit */ 5032 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5033 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5034 stcb->asoc.overall_error_count, 5035 0, 5036 SCTP_FROM_SCTP_INPUT, 5037 __LINE__); 5038 } 5039 stcb->asoc.overall_error_count = 0; 5040 SCTP_STAT_INCR(sctps_recvheartbeatack); 5041 if (netp && *netp) 5042 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch, 5043 stcb, *netp); 5044 break; 5045 case SCTP_ABORT_ASSOCIATION: 5046 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n", 5047 (void *)stcb); 5048 if ((stcb) && netp && *netp) 5049 sctp_handle_abort((struct sctp_abort_chunk *)ch, 5050 stcb, *netp); 5051 *offset = length; 5052 return (NULL); 5053 break; 5054 case SCTP_SHUTDOWN: 5055 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n", 5056 (void *)stcb); 5057 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) { 5058 *offset = length; 5059 if (locked_tcb) { 5060 SCTP_TCB_UNLOCK(locked_tcb); 5061 } 5062 return (NULL); 5063 } 5064 if (netp && *netp) { 5065 int abort_flag = 0; 5066 5067 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch, 5068 stcb, *netp, &abort_flag); 5069 if (abort_flag) { 5070 *offset = length; 5071 return (NULL); 5072 } 5073 } 5074 break; 5075 case SCTP_SHUTDOWN_ACK: 5076 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-ACK, stcb %p\n", (void *)stcb); 5077 if ((stcb) && (netp) && (*netp)) 5078 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp); 5079 *offset = length; 5080 return (NULL); 5081 break; 5082 5083 case SCTP_OPERATION_ERROR: 5084 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP-ERR\n"); 5085 if ((stcb) && netp && *netp && sctp_handle_error(ch, stcb, *netp) < 0) { 5086 *offset = length; 5087 return (NULL); 5088 } 5089 break; 5090 case SCTP_COOKIE_ECHO: 5091 SCTPDBG(SCTP_DEBUG_INPUT3, 5092 "SCTP_COOKIE-ECHO, stcb %p\n", (void *)stcb); 5093 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 5094 ; 5095 } else { 5096 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5097 /* We are not interested anymore */ 5098 abend: 5099 if (stcb) { 5100 SCTP_TCB_UNLOCK(stcb); 5101 } 5102 *offset = length; 5103 return (NULL); 5104 } 5105 } 5106 /* 5107 * First are we accepting? We do this again here 5108 * since it is possible that a previous endpoint WAS 5109 * listening responded to a INIT-ACK and then 5110 * closed. We opened and bound.. and are now no 5111 * longer listening. 5112 */ 5113 5114 if ((stcb == NULL) && (inp->sctp_socket->so_qlen >= inp->sctp_socket->so_qlimit)) { 5115 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 5116 (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) { 5117 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 5118 sctp_abort_association(inp, stcb, m, iphlen, 5119 src, dst, sh, op_err, 5120 use_mflowid, mflowid, 5121 vrf_id, port); 5122 } 5123 *offset = length; 5124 return (NULL); 5125 } else { 5126 struct mbuf *ret_buf; 5127 struct sctp_inpcb *linp; 5128 5129 if (stcb) { 5130 linp = NULL; 5131 } else { 5132 linp = inp; 5133 } 5134 5135 if (linp) { 5136 SCTP_ASOC_CREATE_LOCK(linp); 5137 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 5138 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) { 5139 SCTP_ASOC_CREATE_UNLOCK(linp); 5140 goto abend; 5141 } 5142 } 5143 if (netp) { 5144 ret_buf = 5145 sctp_handle_cookie_echo(m, iphlen, 5146 *offset, 5147 src, dst, 5148 sh, 5149 (struct sctp_cookie_echo_chunk *)ch, 5150 &inp, &stcb, netp, 5151 auth_skipped, 5152 auth_offset, 5153 auth_len, 5154 &locked_tcb, 5155 use_mflowid, 5156 mflowid, 5157 vrf_id, 5158 port); 5159 } else { 5160 ret_buf = NULL; 5161 } 5162 if (linp) { 5163 SCTP_ASOC_CREATE_UNLOCK(linp); 5164 } 5165 if (ret_buf == NULL) { 5166 if (locked_tcb) { 5167 SCTP_TCB_UNLOCK(locked_tcb); 5168 } 5169 SCTPDBG(SCTP_DEBUG_INPUT3, 5170 "GAK, null buffer\n"); 5171 *offset = length; 5172 return (NULL); 5173 } 5174 /* if AUTH skipped, see if it verified... */ 5175 if (auth_skipped) { 5176 got_auth = 1; 5177 auth_skipped = 0; 5178 } 5179 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) { 5180 /* 5181 * Restart the timer if we have 5182 * pending data 5183 */ 5184 struct sctp_tmit_chunk *chk; 5185 5186 chk = TAILQ_FIRST(&stcb->asoc.sent_queue); 5187 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 5188 } 5189 } 5190 break; 5191 case SCTP_COOKIE_ACK: 5192 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE-ACK, stcb %p\n", (void *)stcb); 5193 if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) { 5194 if (locked_tcb) { 5195 SCTP_TCB_UNLOCK(locked_tcb); 5196 } 5197 return (NULL); 5198 } 5199 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5200 /* We are not interested anymore */ 5201 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 5202 ; 5203 } else if (stcb) { 5204#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5205 so = SCTP_INP_SO(inp); 5206 atomic_add_int(&stcb->asoc.refcnt, 1); 5207 SCTP_TCB_UNLOCK(stcb); 5208 SCTP_SOCKET_LOCK(so, 1); 5209 SCTP_TCB_LOCK(stcb); 5210 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5211#endif 5212 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 5213#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5214 SCTP_SOCKET_UNLOCK(so, 1); 5215#endif 5216 *offset = length; 5217 return (NULL); 5218 } 5219 } 5220 /* He's alive so give him credit */ 5221 if ((stcb) && netp && *netp) { 5222 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5223 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5224 stcb->asoc.overall_error_count, 5225 0, 5226 SCTP_FROM_SCTP_INPUT, 5227 __LINE__); 5228 } 5229 stcb->asoc.overall_error_count = 0; 5230 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp); 5231 } 5232 break; 5233 case SCTP_ECN_ECHO: 5234 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-ECHO\n"); 5235 /* He's alive so give him credit */ 5236 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) { 5237 /* Its not ours */ 5238 if (locked_tcb) { 5239 SCTP_TCB_UNLOCK(locked_tcb); 5240 } 5241 *offset = length; 5242 return (NULL); 5243 } 5244 if (stcb) { 5245 if (stcb->asoc.ecn_supported == 0) { 5246 goto unknown_chunk; 5247 } 5248 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5249 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5250 stcb->asoc.overall_error_count, 5251 0, 5252 SCTP_FROM_SCTP_INPUT, 5253 __LINE__); 5254 } 5255 stcb->asoc.overall_error_count = 0; 5256 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, 5257 stcb); 5258 ecne_seen = 1; 5259 } 5260 break; 5261 case SCTP_ECN_CWR: 5262 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-CWR\n"); 5263 /* He's alive so give him credit */ 5264 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) { 5265 /* Its not ours */ 5266 if (locked_tcb) { 5267 SCTP_TCB_UNLOCK(locked_tcb); 5268 } 5269 *offset = length; 5270 return (NULL); 5271 } 5272 if (stcb) { 5273 if (stcb->asoc.ecn_supported == 0) { 5274 goto unknown_chunk; 5275 } 5276 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5277 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5278 stcb->asoc.overall_error_count, 5279 0, 5280 SCTP_FROM_SCTP_INPUT, 5281 __LINE__); 5282 } 5283 stcb->asoc.overall_error_count = 0; 5284 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp); 5285 } 5286 break; 5287 case SCTP_SHUTDOWN_COMPLETE: 5288 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-COMPLETE, stcb %p\n", (void *)stcb); 5289 /* must be first and only chunk */ 5290 if ((num_chunks > 1) || 5291 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 5292 *offset = length; 5293 if (locked_tcb) { 5294 SCTP_TCB_UNLOCK(locked_tcb); 5295 } 5296 return (NULL); 5297 } 5298 if ((stcb) && netp && *netp) { 5299 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch, 5300 stcb, *netp); 5301 } 5302 *offset = length; 5303 return (NULL); 5304 break; 5305 case SCTP_ASCONF: 5306 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n"); 5307 /* He's alive so give him credit */ 5308 if (stcb) { 5309 if (stcb->asoc.asconf_supported == 0) { 5310 goto unknown_chunk; 5311 } 5312 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5313 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5314 stcb->asoc.overall_error_count, 5315 0, 5316 SCTP_FROM_SCTP_INPUT, 5317 __LINE__); 5318 } 5319 stcb->asoc.overall_error_count = 0; 5320 sctp_handle_asconf(m, *offset, src, 5321 (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0); 5322 asconf_cnt++; 5323 } 5324 break; 5325 case SCTP_ASCONF_ACK: 5326 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF-ACK\n"); 5327 if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) { 5328 /* Its not ours */ 5329 if (locked_tcb) { 5330 SCTP_TCB_UNLOCK(locked_tcb); 5331 } 5332 *offset = length; 5333 return (NULL); 5334 } 5335 if ((stcb) && netp && *netp) { 5336 if (stcb->asoc.asconf_supported == 0) { 5337 goto unknown_chunk; 5338 } 5339 /* He's alive so give him credit */ 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 stcb->asoc.overall_error_count = 0; 5348 sctp_handle_asconf_ack(m, *offset, 5349 (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock); 5350 if (abort_no_unlock) 5351 return (NULL); 5352 } 5353 break; 5354 case SCTP_FORWARD_CUM_TSN: 5355 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD-TSN\n"); 5356 if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) { 5357 /* Its not ours */ 5358 if (locked_tcb) { 5359 SCTP_TCB_UNLOCK(locked_tcb); 5360 } 5361 *offset = length; 5362 return (NULL); 5363 } 5364 /* He's alive so give him credit */ 5365 if (stcb) { 5366 int abort_flag = 0; 5367 5368 if (stcb->asoc.prsctp_supported == 0) { 5369 goto unknown_chunk; 5370 } 5371 stcb->asoc.overall_error_count = 0; 5372 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5373 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5374 stcb->asoc.overall_error_count, 5375 0, 5376 SCTP_FROM_SCTP_INPUT, 5377 __LINE__); 5378 } 5379 *fwd_tsn_seen = 1; 5380 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5381 /* We are not interested anymore */ 5382#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5383 so = SCTP_INP_SO(inp); 5384 atomic_add_int(&stcb->asoc.refcnt, 1); 5385 SCTP_TCB_UNLOCK(stcb); 5386 SCTP_SOCKET_LOCK(so, 1); 5387 SCTP_TCB_LOCK(stcb); 5388 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5389#endif 5390 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_29); 5391#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5392 SCTP_SOCKET_UNLOCK(so, 1); 5393#endif 5394 *offset = length; 5395 return (NULL); 5396 } 5397 sctp_handle_forward_tsn(stcb, 5398 (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset); 5399 if (abort_flag) { 5400 *offset = length; 5401 return (NULL); 5402 } else { 5403 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5404 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5405 stcb->asoc.overall_error_count, 5406 0, 5407 SCTP_FROM_SCTP_INPUT, 5408 __LINE__); 5409 } 5410 stcb->asoc.overall_error_count = 0; 5411 } 5412 5413 } 5414 break; 5415 case SCTP_STREAM_RESET: 5416 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n"); 5417 if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) { 5418 /* Its not ours */ 5419 if (locked_tcb) { 5420 SCTP_TCB_UNLOCK(locked_tcb); 5421 } 5422 *offset = length; 5423 return (NULL); 5424 } 5425 if (stcb->asoc.reconfig_supported == 0) { 5426 goto unknown_chunk; 5427 } 5428 if (sctp_handle_stream_reset(stcb, m, *offset, ch)) { 5429 /* stop processing */ 5430 *offset = length; 5431 return (NULL); 5432 } 5433 break; 5434 case SCTP_PACKET_DROPPED: 5435 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n"); 5436 /* re-get it all please */ 5437 if (chk_length < sizeof(struct sctp_pktdrop_chunk)) { 5438 /* Its not ours */ 5439 if (locked_tcb) { 5440 SCTP_TCB_UNLOCK(locked_tcb); 5441 } 5442 *offset = length; 5443 return (NULL); 5444 } 5445 if (ch && (stcb) && netp && (*netp)) { 5446 if (stcb->asoc.pktdrop_supported == 0) { 5447 goto unknown_chunk; 5448 } 5449 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch, 5450 stcb, *netp, 5451 min(chk_length, (sizeof(chunk_buf) - 4))); 5452 5453 } 5454 break; 5455 case SCTP_AUTHENTICATION: 5456 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n"); 5457 if (stcb == NULL) { 5458 /* save the first AUTH for later processing */ 5459 if (auth_skipped == 0) { 5460 auth_offset = *offset; 5461 auth_len = chk_length; 5462 auth_skipped = 1; 5463 } 5464 /* skip this chunk (temporarily) */ 5465 goto next_chunk; 5466 } 5467 if (stcb->asoc.auth_supported == 0) { 5468 goto unknown_chunk; 5469 } 5470 if ((chk_length < (sizeof(struct sctp_auth_chunk))) || 5471 (chk_length > (sizeof(struct sctp_auth_chunk) + 5472 SCTP_AUTH_DIGEST_LEN_MAX))) { 5473 /* Its not ours */ 5474 if (locked_tcb) { 5475 SCTP_TCB_UNLOCK(locked_tcb); 5476 } 5477 *offset = length; 5478 return (NULL); 5479 } 5480 if (got_auth == 1) { 5481 /* skip this chunk... it's already auth'd */ 5482 goto next_chunk; 5483 } 5484 got_auth = 1; 5485 if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch, 5486 m, *offset)) { 5487 /* auth HMAC failed so dump the packet */ 5488 *offset = length; 5489 return (stcb); 5490 } else { 5491 /* remaining chunks are HMAC checked */ 5492 stcb->asoc.authenticated = 1; 5493 } 5494 break; 5495 5496 default: 5497 unknown_chunk: 5498 /* it's an unknown chunk! */ 5499 if ((ch->chunk_type & 0x40) && (stcb != NULL)) { 5500 struct mbuf *mm; 5501 struct sctp_paramhdr *phd; 5502 5503 mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 5504 0, M_NOWAIT, 1, MT_DATA); 5505 if (mm) { 5506 phd = mtod(mm, struct sctp_paramhdr *); 5507 /* 5508 * We cheat and use param type since 5509 * we did not bother to define a 5510 * error cause struct. They are the 5511 * same basic format with different 5512 * names. 5513 */ 5514 phd->param_type = htons(SCTP_CAUSE_UNRECOG_CHUNK); 5515 phd->param_length = htons(chk_length + sizeof(*phd)); 5516 SCTP_BUF_LEN(mm) = sizeof(*phd); 5517 SCTP_BUF_NEXT(mm) = SCTP_M_COPYM(m, *offset, chk_length, M_NOWAIT); 5518 if (SCTP_BUF_NEXT(mm)) { 5519 if (sctp_pad_lastmbuf(SCTP_BUF_NEXT(mm), SCTP_SIZE32(chk_length) - chk_length, NULL) == NULL) { 5520 sctp_m_freem(mm); 5521 } else { 5522#ifdef SCTP_MBUF_LOGGING 5523 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5524 struct mbuf *mat; 5525 5526 for (mat = SCTP_BUF_NEXT(mm); mat; mat = SCTP_BUF_NEXT(mat)) { 5527 if (SCTP_BUF_IS_EXTENDED(mat)) { 5528 sctp_log_mb(mat, SCTP_MBUF_ICOPY); 5529 } 5530 } 5531 } 5532#endif 5533 sctp_queue_op_err(stcb, mm); 5534 } 5535 } else { 5536 sctp_m_freem(mm); 5537 } 5538 } 5539 } 5540 if ((ch->chunk_type & 0x80) == 0) { 5541 /* discard this packet */ 5542 *offset = length; 5543 return (stcb); 5544 } /* else skip this bad chunk and continue... */ 5545 break; 5546 } /* switch (ch->chunk_type) */ 5547 5548 5549next_chunk: 5550 /* get the next chunk */ 5551 *offset += SCTP_SIZE32(chk_length); 5552 if (*offset >= length) { 5553 /* no more data left in the mbuf chain */ 5554 break; 5555 } 5556 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 5557 sizeof(struct sctp_chunkhdr), chunk_buf); 5558 if (ch == NULL) { 5559 if (locked_tcb) { 5560 SCTP_TCB_UNLOCK(locked_tcb); 5561 } 5562 *offset = length; 5563 return (NULL); 5564 } 5565 } /* while */ 5566 5567 if (asconf_cnt > 0 && stcb != NULL) { 5568 sctp_send_asconf_ack(stcb); 5569 } 5570 return (stcb); 5571} 5572 5573 5574#ifdef INVARIANTS 5575#ifdef __GNUC__ 5576__attribute__((noinline)) 5577#endif 5578 void 5579 sctp_validate_no_locks(struct sctp_inpcb *inp) 5580{ 5581 struct sctp_tcb *lstcb; 5582 5583 LIST_FOREACH(lstcb, &inp->sctp_asoc_list, sctp_tcblist) { 5584 if (mtx_owned(&lstcb->tcb_mtx)) { 5585 panic("Own lock on stcb at return from input"); 5586 } 5587 } 5588 if (mtx_owned(&inp->inp_create_mtx)) { 5589 panic("Own create lock on inp"); 5590 } 5591 if (mtx_owned(&inp->inp_mtx)) { 5592 panic("Own inp lock on inp"); 5593 } 5594} 5595 5596#endif 5597 5598/* 5599 * common input chunk processing (v4 and v6) 5600 */ 5601void 5602sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length, 5603 struct sockaddr *src, struct sockaddr *dst, 5604 struct sctphdr *sh, struct sctp_chunkhdr *ch, 5605#if !defined(SCTP_WITH_NO_CSUM) 5606 uint8_t compute_crc, 5607#endif 5608 uint8_t ecn_bits, 5609 uint8_t use_mflowid, uint32_t mflowid, 5610 uint32_t vrf_id, uint16_t port) 5611{ 5612 uint32_t high_tsn; 5613 int fwd_tsn_seen = 0, data_processed = 0; 5614 struct mbuf *m = *mm, *op_err; 5615 char msg[SCTP_DIAG_INFO_LEN]; 5616 int un_sent; 5617 int cnt_ctrl_ready = 0; 5618 struct sctp_inpcb *inp = NULL, *inp_decr = NULL; 5619 struct sctp_tcb *stcb = NULL; 5620 struct sctp_nets *net = NULL; 5621 5622 SCTP_STAT_INCR(sctps_recvdatagrams); 5623#ifdef SCTP_AUDITING_ENABLED 5624 sctp_audit_log(0xE0, 1); 5625 sctp_auditing(0, inp, stcb, net); 5626#endif 5627#if !defined(SCTP_WITH_NO_CSUM) 5628 if (compute_crc != 0) { 5629 uint32_t check, calc_check; 5630 5631 check = sh->checksum; 5632 sh->checksum = 0; 5633 calc_check = sctp_calculate_cksum(m, iphlen); 5634 sh->checksum = check; 5635 if (calc_check != check) { 5636 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x m:%p mlen:%d iphlen:%d\n", 5637 calc_check, check, (void *)m, length, iphlen); 5638 stcb = sctp_findassociation_addr(m, offset, src, dst, 5639 sh, ch, &inp, &net, vrf_id); 5640#if defined(INET) || defined(INET6) 5641 if ((net != NULL) && (port != 0)) { 5642 if (net->port == 0) { 5643 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr)); 5644 } 5645 net->port = port; 5646 } 5647#endif 5648 if ((net != NULL) && (use_mflowid != 0)) { 5649 net->flowid = mflowid; 5650#ifdef INVARIANTS 5651 net->flowidset = 1; 5652#endif 5653 } 5654 if ((inp != NULL) && (stcb != NULL)) { 5655 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1); 5656 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED); 5657 } else if ((inp != NULL) && (stcb == NULL)) { 5658 inp_decr = inp; 5659 } 5660 SCTP_STAT_INCR(sctps_badsum); 5661 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors); 5662 goto out; 5663 } 5664 } 5665#endif 5666 /* Destination port of 0 is illegal, based on RFC4960. */ 5667 if (sh->dest_port == 0) { 5668 SCTP_STAT_INCR(sctps_hdrops); 5669 goto out; 5670 } 5671 stcb = sctp_findassociation_addr(m, offset, src, dst, 5672 sh, ch, &inp, &net, vrf_id); 5673#if defined(INET) || defined(INET6) 5674 if ((net != NULL) && (port != 0)) { 5675 if (net->port == 0) { 5676 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr)); 5677 } 5678 net->port = port; 5679 } 5680#endif 5681 if ((net != NULL) && (use_mflowid != 0)) { 5682 net->flowid = mflowid; 5683#ifdef INVARIANTS 5684 net->flowidset = 1; 5685#endif 5686 } 5687 if (inp == NULL) { 5688 SCTP_STAT_INCR(sctps_noport); 5689 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) { 5690 goto out; 5691 } 5692 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 5693 sctp_send_shutdown_complete2(src, dst, sh, 5694 use_mflowid, mflowid, 5695 vrf_id, port); 5696 goto out; 5697 } 5698 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) { 5699 goto out; 5700 } 5701 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) { 5702 if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) || 5703 ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) && 5704 (ch->chunk_type != SCTP_INIT))) { 5705 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5706 "Out of the blue"); 5707 sctp_send_abort(m, iphlen, src, dst, 5708 sh, 0, op_err, 5709 use_mflowid, mflowid, 5710 vrf_id, port); 5711 } 5712 } 5713 goto out; 5714 } else if (stcb == NULL) { 5715 inp_decr = inp; 5716 } 5717#ifdef IPSEC 5718 /*- 5719 * I very much doubt any of the IPSEC stuff will work but I have no 5720 * idea, so I will leave it in place. 5721 */ 5722 if (inp != NULL) { 5723 switch (dst->sa_family) { 5724#ifdef INET 5725 case AF_INET: 5726 if (ipsec4_in_reject(m, &inp->ip_inp.inp)) { 5727 IPSECSTAT_INC(ips_in_polvio); 5728 SCTP_STAT_INCR(sctps_hdrops); 5729 goto out; 5730 } 5731 break; 5732#endif 5733#ifdef INET6 5734 case AF_INET6: 5735 if (ipsec6_in_reject(m, &inp->ip_inp.inp)) { 5736 IPSEC6STAT_INC(ips_in_polvio); 5737 SCTP_STAT_INCR(sctps_hdrops); 5738 goto out; 5739 } 5740 break; 5741#endif 5742 default: 5743 break; 5744 } 5745 } 5746#endif 5747 SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n", 5748 (void *)m, iphlen, offset, length, (void *)stcb); 5749 if (stcb) { 5750 /* always clear this before beginning a packet */ 5751 stcb->asoc.authenticated = 0; 5752 stcb->asoc.seen_a_sack_this_pkt = 0; 5753 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n", 5754 (void *)stcb, stcb->asoc.state); 5755 5756 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) || 5757 (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) { 5758 /*- 5759 * If we hit here, we had a ref count 5760 * up when the assoc was aborted and the 5761 * timer is clearing out the assoc, we should 5762 * NOT respond to any packet.. its OOTB. 5763 */ 5764 SCTP_TCB_UNLOCK(stcb); 5765 stcb = NULL; 5766 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__); 5767 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5768 msg); 5769 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5770 use_mflowid, mflowid, 5771 vrf_id, port); 5772 goto out; 5773 } 5774 } 5775 if (IS_SCTP_CONTROL(ch)) { 5776 /* process the control portion of the SCTP packet */ 5777 /* sa_ignore NO_NULL_CHK */ 5778 stcb = sctp_process_control(m, iphlen, &offset, length, 5779 src, dst, sh, ch, 5780 inp, stcb, &net, &fwd_tsn_seen, 5781 use_mflowid, mflowid, 5782 vrf_id, port); 5783 if (stcb) { 5784 /* 5785 * This covers us if the cookie-echo was there and 5786 * it changes our INP. 5787 */ 5788 inp = stcb->sctp_ep; 5789#if defined(INET) || defined(INET6) 5790 if ((net) && (port)) { 5791 if (net->port == 0) { 5792 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr)); 5793 } 5794 net->port = port; 5795 } 5796#endif 5797 } 5798 } else { 5799 /* 5800 * no control chunks, so pre-process DATA chunks (these 5801 * checks are taken care of by control processing) 5802 */ 5803 5804 /* 5805 * if DATA only packet, and auth is required, then punt... 5806 * can't have authenticated without any AUTH (control) 5807 * chunks 5808 */ 5809 if ((stcb != NULL) && 5810 (stcb->asoc.auth_supported == 1) && 5811 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) { 5812 /* "silently" ignore */ 5813 SCTP_STAT_INCR(sctps_recvauthmissing); 5814 goto out; 5815 } 5816 if (stcb == NULL) { 5817 /* out of the blue DATA chunk */ 5818 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__); 5819 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5820 msg); 5821 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5822 use_mflowid, mflowid, 5823 vrf_id, port); 5824 goto out; 5825 } 5826 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) { 5827 /* v_tag mismatch! */ 5828 SCTP_STAT_INCR(sctps_badvtag); 5829 goto out; 5830 } 5831 } 5832 5833 if (stcb == NULL) { 5834 /* 5835 * no valid TCB for this packet, or we found it's a bad 5836 * packet while processing control, or we're done with this 5837 * packet (done or skip rest of data), so we drop it... 5838 */ 5839 goto out; 5840 } 5841 /* 5842 * DATA chunk processing 5843 */ 5844 /* plow through the data chunks while length > offset */ 5845 5846 /* 5847 * Rest should be DATA only. Check authentication state if AUTH for 5848 * DATA is required. 5849 */ 5850 if ((length > offset) && 5851 (stcb != NULL) && 5852 (stcb->asoc.auth_supported == 1) && 5853 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) && 5854 !stcb->asoc.authenticated) { 5855 /* "silently" ignore */ 5856 SCTP_STAT_INCR(sctps_recvauthmissing); 5857 SCTPDBG(SCTP_DEBUG_AUTH1, 5858 "Data chunk requires AUTH, skipped\n"); 5859 goto trigger_send; 5860 } 5861 if (length > offset) { 5862 int retval; 5863 5864 /* 5865 * First check to make sure our state is correct. We would 5866 * not get here unless we really did have a tag, so we don't 5867 * abort if this happens, just dump the chunk silently. 5868 */ 5869 switch (SCTP_GET_STATE(&stcb->asoc)) { 5870 case SCTP_STATE_COOKIE_ECHOED: 5871 /* 5872 * we consider data with valid tags in this state 5873 * shows us the cookie-ack was lost. Imply it was 5874 * there. 5875 */ 5876 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5877 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5878 stcb->asoc.overall_error_count, 5879 0, 5880 SCTP_FROM_SCTP_INPUT, 5881 __LINE__); 5882 } 5883 stcb->asoc.overall_error_count = 0; 5884 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net); 5885 break; 5886 case SCTP_STATE_COOKIE_WAIT: 5887 /* 5888 * We consider OOTB any data sent during asoc setup. 5889 */ 5890 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__); 5891 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5892 msg); 5893 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5894 use_mflowid, mflowid, 5895 vrf_id, port); 5896 goto out; 5897 /* sa_ignore NOTREACHED */ 5898 break; 5899 case SCTP_STATE_EMPTY: /* should not happen */ 5900 case SCTP_STATE_INUSE: /* should not happen */ 5901 case SCTP_STATE_SHUTDOWN_RECEIVED: /* This is a peer error */ 5902 case SCTP_STATE_SHUTDOWN_ACK_SENT: 5903 default: 5904 goto out; 5905 /* sa_ignore NOTREACHED */ 5906 break; 5907 case SCTP_STATE_OPEN: 5908 case SCTP_STATE_SHUTDOWN_SENT: 5909 break; 5910 } 5911 /* plow through the data chunks while length > offset */ 5912 retval = sctp_process_data(mm, iphlen, &offset, length, 5913 src, dst, sh, 5914 inp, stcb, net, &high_tsn, 5915 use_mflowid, mflowid, 5916 vrf_id, port); 5917 if (retval == 2) { 5918 /* 5919 * The association aborted, NO UNLOCK needed since 5920 * the association is destroyed. 5921 */ 5922 stcb = NULL; 5923 goto out; 5924 } 5925 data_processed = 1; 5926 /* 5927 * Anything important needs to have been m_copy'ed in 5928 * process_data 5929 */ 5930 } 5931 /* take care of ecn */ 5932 if ((data_processed == 1) && 5933 (stcb->asoc.ecn_supported == 1) && 5934 ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) { 5935 /* Yep, we need to add a ECNE */ 5936 sctp_send_ecn_echo(stcb, net, high_tsn); 5937 } 5938 if ((data_processed == 0) && (fwd_tsn_seen)) { 5939 int was_a_gap; 5940 uint32_t highest_tsn; 5941 5942 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) { 5943 highest_tsn = stcb->asoc.highest_tsn_inside_nr_map; 5944 } else { 5945 highest_tsn = stcb->asoc.highest_tsn_inside_map; 5946 } 5947 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn); 5948 stcb->asoc.send_sack = 1; 5949 sctp_sack_check(stcb, was_a_gap); 5950 } else if (fwd_tsn_seen) { 5951 stcb->asoc.send_sack = 1; 5952 } 5953 /* trigger send of any chunks in queue... */ 5954trigger_send: 5955#ifdef SCTP_AUDITING_ENABLED 5956 sctp_audit_log(0xE0, 2); 5957 sctp_auditing(1, inp, stcb, net); 5958#endif 5959 SCTPDBG(SCTP_DEBUG_INPUT1, 5960 "Check for chunk output prw:%d tqe:%d tf=%d\n", 5961 stcb->asoc.peers_rwnd, 5962 TAILQ_EMPTY(&stcb->asoc.control_send_queue), 5963 stcb->asoc.total_flight); 5964 un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight); 5965 if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 5966 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq; 5967 } 5968 if (cnt_ctrl_ready || 5969 ((un_sent) && 5970 (stcb->asoc.peers_rwnd > 0 || 5971 (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) { 5972 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n"); 5973 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 5974 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n"); 5975 } 5976#ifdef SCTP_AUDITING_ENABLED 5977 sctp_audit_log(0xE0, 3); 5978 sctp_auditing(2, inp, stcb, net); 5979#endif 5980out: 5981 if (stcb != NULL) { 5982 SCTP_TCB_UNLOCK(stcb); 5983 } 5984 if (inp_decr != NULL) { 5985 /* reduce ref-count */ 5986 SCTP_INP_WLOCK(inp_decr); 5987 SCTP_INP_DECR_REF(inp_decr); 5988 SCTP_INP_WUNLOCK(inp_decr); 5989 } 5990#ifdef INVARIANTS 5991 if (inp != NULL) { 5992 sctp_validate_no_locks(inp); 5993 } 5994#endif 5995 return; 5996} 5997 5998#if 0 5999static void 6000sctp_print_mbuf_chain(struct mbuf *m) 6001{ 6002 for (; m; m = SCTP_BUF_NEXT(m)) { 6003 SCTP_PRINTF("%p: m_len = %ld\n", (void *)m, SCTP_BUF_LEN(m)); 6004 if (SCTP_BUF_IS_EXTENDED(m)) 6005 SCTP_PRINTF("%p: extend_size = %d\n", (void *)m, SCTP_BUF_EXTEND_SIZE(m)); 6006 } 6007} 6008 6009#endif 6010 6011#ifdef INET 6012void 6013sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port) 6014{ 6015 struct mbuf *m; 6016 int iphlen; 6017 uint32_t vrf_id = 0; 6018 uint8_t ecn_bits; 6019 struct sockaddr_in src, dst; 6020 struct ip *ip; 6021 struct sctphdr *sh; 6022 struct sctp_chunkhdr *ch; 6023 int length, offset; 6024 6025#if !defined(SCTP_WITH_NO_CSUM) 6026 uint8_t compute_crc; 6027 6028#endif 6029 uint32_t mflowid; 6030 uint8_t use_mflowid; 6031 6032 iphlen = off; 6033 if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) { 6034 SCTP_RELEASE_PKT(i_pak); 6035 return; 6036 } 6037 m = SCTP_HEADER_TO_CHAIN(i_pak); 6038#ifdef SCTP_MBUF_LOGGING 6039 /* Log in any input mbufs */ 6040 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 6041 struct mbuf *mat; 6042 6043 for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) { 6044 if (SCTP_BUF_IS_EXTENDED(mat)) { 6045 sctp_log_mb(mat, SCTP_MBUF_INPUT); 6046 } 6047 } 6048 } 6049#endif 6050#ifdef SCTP_PACKET_LOGGING 6051 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) { 6052 sctp_packet_log(m); 6053 } 6054#endif 6055 SCTPDBG(SCTP_DEBUG_CRCOFFLOAD, 6056 "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n", 6057 m->m_pkthdr.len, 6058 if_name(m->m_pkthdr.rcvif), 6059 (int)m->m_pkthdr.csum_flags, CSUM_BITS); 6060 if (m->m_flags & M_FLOWID) { 6061 mflowid = m->m_pkthdr.flowid; 6062 use_mflowid = 1; 6063 } else { 6064 mflowid = 0; 6065 use_mflowid = 0; 6066 } 6067 SCTP_STAT_INCR(sctps_recvpackets); 6068 SCTP_STAT_INCR_COUNTER64(sctps_inpackets); 6069 /* Get IP, SCTP, and first chunk header together in the first mbuf. */ 6070 offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr); 6071 if (SCTP_BUF_LEN(m) < offset) { 6072 if ((m = m_pullup(m, offset)) == NULL) { 6073 SCTP_STAT_INCR(sctps_hdrops); 6074 return; 6075 } 6076 } 6077 ip = mtod(m, struct ip *); 6078 sh = (struct sctphdr *)((caddr_t)ip + iphlen); 6079 ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr)); 6080 offset -= sizeof(struct sctp_chunkhdr); 6081 memset(&src, 0, sizeof(struct sockaddr_in)); 6082 src.sin_family = AF_INET; 6083 src.sin_len = sizeof(struct sockaddr_in); 6084 src.sin_port = sh->src_port; 6085 src.sin_addr = ip->ip_src; 6086 memset(&dst, 0, sizeof(struct sockaddr_in)); 6087 dst.sin_family = AF_INET; 6088 dst.sin_len = sizeof(struct sockaddr_in); 6089 dst.sin_port = sh->dest_port; 6090 dst.sin_addr = ip->ip_dst; 6091 length = ntohs(ip->ip_len); 6092 /* Validate mbuf chain length with IP payload length. */ 6093 if (SCTP_HEADER_LEN(m) != length) { 6094 SCTPDBG(SCTP_DEBUG_INPUT1, 6095 "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m)); 6096 SCTP_STAT_INCR(sctps_hdrops); 6097 goto out; 6098 } 6099 /* SCTP does not allow broadcasts or multicasts */ 6100 if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) { 6101 goto out; 6102 } 6103 if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) { 6104 goto out; 6105 } 6106 ecn_bits = ip->ip_tos; 6107#if defined(SCTP_WITH_NO_CSUM) 6108 SCTP_STAT_INCR(sctps_recvnocrc); 6109#else 6110 if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) { 6111 SCTP_STAT_INCR(sctps_recvhwcrc); 6112 compute_crc = 0; 6113 } else { 6114 SCTP_STAT_INCR(sctps_recvswcrc); 6115 compute_crc = 1; 6116 } 6117#endif 6118 sctp_common_input_processing(&m, iphlen, offset, length, 6119 (struct sockaddr *)&src, 6120 (struct sockaddr *)&dst, 6121 sh, ch, 6122#if !defined(SCTP_WITH_NO_CSUM) 6123 compute_crc, 6124#endif 6125 ecn_bits, 6126 use_mflowid, mflowid, 6127 vrf_id, port); 6128out: 6129 if (m) { 6130 sctp_m_freem(m); 6131 } 6132 return; 6133} 6134 6135#if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP) 6136extern int *sctp_cpuarry; 6137 6138#endif 6139 6140void 6141sctp_input(struct mbuf *m, int off) 6142{ 6143#if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP) 6144 struct ip *ip; 6145 struct sctphdr *sh; 6146 int offset; 6147 int cpu_to_use; 6148 uint32_t flowid, tag; 6149 6150 if (mp_ncpus > 1) { 6151 if (m->m_flags & M_FLOWID) { 6152 flowid = m->m_pkthdr.flowid; 6153 } else { 6154 /* 6155 * No flow id built by lower layers fix it so we 6156 * create one. 6157 */ 6158 offset = off + sizeof(struct sctphdr); 6159 if (SCTP_BUF_LEN(m) < offset) { 6160 if ((m = m_pullup(m, offset)) == NULL) { 6161 SCTP_STAT_INCR(sctps_hdrops); 6162 return; 6163 } 6164 } 6165 ip = mtod(m, struct ip *); 6166 sh = (struct sctphdr *)((caddr_t)ip + off); 6167 tag = htonl(sh->v_tag); 6168 flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port); 6169 m->m_pkthdr.flowid = flowid; 6170 m->m_flags |= M_FLOWID; 6171 } 6172 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus]; 6173 sctp_queue_to_mcore(m, off, cpu_to_use); 6174 return; 6175 } 6176#endif 6177 sctp_input_with_port(m, off, 0); 6178} 6179 6180#endif 6181