sctp_input.c revision 283708
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 283708 2015-05-29 12:03:02Z 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 mflowtype, 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 mflowtype, 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 mflowtype, 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 mflowtype, 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 mflowtype, 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 mflowtype, 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 mflowtype, 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 mflowtype, 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 mflowtype, 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 mflowtype, 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 mflowtype, 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 mflowtype, 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 union sctp_sockstore 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 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) { 572 /* Invalid length */ 573 return; 574 } 575 memset(&store, 0, sizeof(store)); 576 switch (cp->heartbeat.hb_info.addr_family) { 577#ifdef INET 578 case AF_INET: 579 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) { 580 store.sin.sin_family = cp->heartbeat.hb_info.addr_family; 581 store.sin.sin_len = cp->heartbeat.hb_info.addr_len; 582 store.sin.sin_port = stcb->rport; 583 memcpy(&store.sin.sin_addr, cp->heartbeat.hb_info.address, 584 sizeof(store.sin.sin_addr)); 585 } else { 586 return; 587 } 588 break; 589#endif 590#ifdef INET6 591 case AF_INET6: 592 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) { 593 store.sin6.sin6_family = cp->heartbeat.hb_info.addr_family; 594 store.sin6.sin6_len = cp->heartbeat.hb_info.addr_len; 595 store.sin6.sin6_port = stcb->rport; 596 memcpy(&store.sin6.sin6_addr, cp->heartbeat.hb_info.address, sizeof(struct in6_addr)); 597 } else { 598 return; 599 } 600 break; 601#endif 602 default: 603 return; 604 } 605 r_net = sctp_findnet(stcb, &store.sa); 606 if (r_net == NULL) { 607 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n"); 608 return; 609 } 610 if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) && 611 (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) && 612 (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) { 613 /* 614 * If the its a HB and it's random value is correct when can 615 * confirm the destination. 616 */ 617 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 618 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) { 619 stcb->asoc.primary_destination = r_net; 620 r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY; 621 f_net = TAILQ_FIRST(&stcb->asoc.nets); 622 if (f_net != r_net) { 623 /* 624 * first one on the list is NOT the primary 625 * sctp_cmpaddr() is much more efficent if 626 * the primary is the first on the list, 627 * make it so. 628 */ 629 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next); 630 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next); 631 } 632 req_prim = 1; 633 } 634 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 635 stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 636 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3); 637 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 638 } 639 old_error_counter = r_net->error_count; 640 r_net->error_count = 0; 641 r_net->hb_responded = 1; 642 tv.tv_sec = cp->heartbeat.hb_info.time_value_1; 643 tv.tv_usec = cp->heartbeat.hb_info.time_value_2; 644 /* Now lets do a RTO with this */ 645 r_net->RTO = sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, sctp_align_safe_nocopy, 646 SCTP_RTT_FROM_NON_DATA); 647 if (!(r_net->dest_state & SCTP_ADDR_REACHABLE)) { 648 r_net->dest_state |= SCTP_ADDR_REACHABLE; 649 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb, 650 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 651 } 652 if (r_net->dest_state & SCTP_ADDR_PF) { 653 r_net->dest_state &= ~SCTP_ADDR_PF; 654 stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net); 655 } 656 if (old_error_counter > 0) { 657 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3); 658 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 659 } 660 if (r_net == stcb->asoc.primary_destination) { 661 if (stcb->asoc.alternate) { 662 /* release the alternate, primary is good */ 663 sctp_free_remote_addr(stcb->asoc.alternate); 664 stcb->asoc.alternate = NULL; 665 } 666 } 667 /* Mobility adaptation */ 668 if (req_prim) { 669 if ((sctp_is_mobility_feature_on(stcb->sctp_ep, 670 SCTP_MOBILITY_BASE) || 671 sctp_is_mobility_feature_on(stcb->sctp_ep, 672 SCTP_MOBILITY_FASTHANDOFF)) && 673 sctp_is_mobility_feature_on(stcb->sctp_ep, 674 SCTP_MOBILITY_PRIM_DELETED)) { 675 676 sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED, stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_TIMER + SCTP_LOC_7); 677 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 678 SCTP_MOBILITY_FASTHANDOFF)) { 679 sctp_assoc_immediate_retrans(stcb, 680 stcb->asoc.primary_destination); 681 } 682 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 683 SCTP_MOBILITY_BASE)) { 684 sctp_move_chunks_from_net(stcb, 685 stcb->asoc.deleted_primary); 686 } 687 sctp_delete_prim_timer(stcb->sctp_ep, stcb, 688 stcb->asoc.deleted_primary); 689 } 690 } 691} 692 693static int 694sctp_handle_nat_colliding_state(struct sctp_tcb *stcb) 695{ 696 /* 697 * return 0 means we want you to proceed with the abort non-zero 698 * means no abort processing 699 */ 700 struct sctpasochead *head; 701 702 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_WAIT) { 703 /* generate a new vtag and send init */ 704 LIST_REMOVE(stcb, sctp_asocs); 705 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 706 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 707 /* 708 * put it in the bucket in the vtag hash of assoc's for the 709 * system 710 */ 711 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 712 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 713 return (1); 714 } 715 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) { 716 /* 717 * treat like a case where the cookie expired i.e.: - dump 718 * current cookie. - generate a new vtag. - resend init. 719 */ 720 /* generate a new vtag and send init */ 721 LIST_REMOVE(stcb, sctp_asocs); 722 stcb->asoc.state &= ~SCTP_STATE_COOKIE_ECHOED; 723 stcb->asoc.state |= SCTP_STATE_COOKIE_WAIT; 724 sctp_stop_all_cookie_timers(stcb); 725 sctp_toss_old_cookies(stcb, &stcb->asoc); 726 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 727 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 728 /* 729 * put it in the bucket in the vtag hash of assoc's for the 730 * system 731 */ 732 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 733 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 734 return (1); 735 } 736 return (0); 737} 738 739static int 740sctp_handle_nat_missing_state(struct sctp_tcb *stcb, 741 struct sctp_nets *net) 742{ 743 /* 744 * return 0 means we want you to proceed with the abort non-zero 745 * means no abort processing 746 */ 747 if (stcb->asoc.auth_supported == 0) { 748 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n"); 749 return (0); 750 } 751 sctp_asconf_send_nat_state_update(stcb, net); 752 return (1); 753} 754 755 756static void 757sctp_handle_abort(struct sctp_abort_chunk *abort, 758 struct sctp_tcb *stcb, struct sctp_nets *net) 759{ 760#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 761 struct socket *so; 762 763#endif 764 uint16_t len; 765 uint16_t error; 766 767 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n"); 768 if (stcb == NULL) 769 return; 770 771 len = ntohs(abort->ch.chunk_length); 772 if (len > sizeof(struct sctp_chunkhdr)) { 773 /* 774 * Need to check the cause codes for our two magic nat 775 * aborts which don't kill the assoc necessarily. 776 */ 777 struct sctp_missing_nat_state *natc; 778 779 natc = (struct sctp_missing_nat_state *)(abort + 1); 780 error = ntohs(natc->cause); 781 if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) { 782 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n", 783 abort->ch.chunk_flags); 784 if (sctp_handle_nat_colliding_state(stcb)) { 785 return; 786 } 787 } else if (error == SCTP_CAUSE_NAT_MISSING_STATE) { 788 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n", 789 abort->ch.chunk_flags); 790 if (sctp_handle_nat_missing_state(stcb, net)) { 791 return; 792 } 793 } 794 } else { 795 error = 0; 796 } 797 /* stop any receive timers */ 798 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_6); 799 /* notify user of the abort and clean up... */ 800 sctp_abort_notification(stcb, 1, error, abort, SCTP_SO_NOT_LOCKED); 801 /* free the tcb */ 802 SCTP_STAT_INCR_COUNTER32(sctps_aborted); 803 if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) || 804 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 805 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 806 } 807#ifdef SCTP_ASOCLOG_OF_TSNS 808 sctp_print_out_track_log(stcb); 809#endif 810#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 811 so = SCTP_INP_SO(stcb->sctp_ep); 812 atomic_add_int(&stcb->asoc.refcnt, 1); 813 SCTP_TCB_UNLOCK(stcb); 814 SCTP_SOCKET_LOCK(so, 1); 815 SCTP_TCB_LOCK(stcb); 816 atomic_subtract_int(&stcb->asoc.refcnt, 1); 817#endif 818 stcb->asoc.state |= SCTP_STATE_WAS_ABORTED; 819 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 820 SCTP_FROM_SCTP_INPUT + SCTP_LOC_6); 821#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 822 SCTP_SOCKET_UNLOCK(so, 1); 823#endif 824 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n"); 825} 826 827static void 828sctp_start_net_timers(struct sctp_tcb *stcb) 829{ 830 uint32_t cnt_hb_sent; 831 struct sctp_nets *net; 832 833 cnt_hb_sent = 0; 834 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 835 /* 836 * For each network start: 1) A pmtu timer. 2) A HB timer 3) 837 * If the dest in unconfirmed send a hb as well if under 838 * max_hb_burst have been sent. 839 */ 840 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net); 841 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net); 842 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) && 843 (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) { 844 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 845 cnt_hb_sent++; 846 } 847 } 848 if (cnt_hb_sent) { 849 sctp_chunk_output(stcb->sctp_ep, stcb, 850 SCTP_OUTPUT_FROM_COOKIE_ACK, 851 SCTP_SO_NOT_LOCKED); 852 } 853} 854 855 856static void 857sctp_handle_shutdown(struct sctp_shutdown_chunk *cp, 858 struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag) 859{ 860 struct sctp_association *asoc; 861 int some_on_streamwheel; 862 863#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 864 struct socket *so; 865 866#endif 867 868 SCTPDBG(SCTP_DEBUG_INPUT2, 869 "sctp_handle_shutdown: handling SHUTDOWN\n"); 870 if (stcb == NULL) 871 return; 872 asoc = &stcb->asoc; 873 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) || 874 (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) { 875 return; 876 } 877 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) { 878 /* Shutdown NOT the expected size */ 879 return; 880 } else { 881 sctp_update_acked(stcb, cp, abort_flag); 882 if (*abort_flag) { 883 return; 884 } 885 } 886 if (asoc->control_pdapi) { 887 /* 888 * With a normal shutdown we assume the end of last record. 889 */ 890 SCTP_INP_READ_LOCK(stcb->sctp_ep); 891 asoc->control_pdapi->end_added = 1; 892 asoc->control_pdapi->pdapi_aborted = 1; 893 asoc->control_pdapi = NULL; 894 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 895#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 896 so = SCTP_INP_SO(stcb->sctp_ep); 897 atomic_add_int(&stcb->asoc.refcnt, 1); 898 SCTP_TCB_UNLOCK(stcb); 899 SCTP_SOCKET_LOCK(so, 1); 900 SCTP_TCB_LOCK(stcb); 901 atomic_subtract_int(&stcb->asoc.refcnt, 1); 902 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 903 /* assoc was freed while we were unlocked */ 904 SCTP_SOCKET_UNLOCK(so, 1); 905 return; 906 } 907#endif 908 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 909#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 910 SCTP_SOCKET_UNLOCK(so, 1); 911#endif 912 } 913 /* goto SHUTDOWN_RECEIVED state to block new requests */ 914 if (stcb->sctp_socket) { 915 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) && 916 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) && 917 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) { 918 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_RECEIVED); 919 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 920 /* 921 * notify upper layer that peer has initiated a 922 * shutdown 923 */ 924 sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 925 926 /* reset time */ 927 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 928 } 929 } 930 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) { 931 /* 932 * stop the shutdown timer, since we WILL move to 933 * SHUTDOWN-ACK-SENT. 934 */ 935 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_8); 936 } 937 /* Now is there unsent data on a stream somewhere? */ 938 some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED); 939 940 if (!TAILQ_EMPTY(&asoc->send_queue) || 941 !TAILQ_EMPTY(&asoc->sent_queue) || 942 some_on_streamwheel) { 943 /* By returning we will push more data out */ 944 return; 945 } else { 946 /* no outstanding data to send, so move on... */ 947 /* send SHUTDOWN-ACK */ 948 /* move to SHUTDOWN-ACK-SENT state */ 949 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) || 950 (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 951 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 952 } 953 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT); 954 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 955 sctp_stop_timers_for_shutdown(stcb); 956 sctp_send_shutdown_ack(stcb, net); 957 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, 958 stcb, net); 959 } 960} 961 962static void 963sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED, 964 struct sctp_tcb *stcb, 965 struct sctp_nets *net) 966{ 967 struct sctp_association *asoc; 968 969#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 970 struct socket *so; 971 972 so = SCTP_INP_SO(stcb->sctp_ep); 973#endif 974 SCTPDBG(SCTP_DEBUG_INPUT2, 975 "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n"); 976 if (stcb == NULL) 977 return; 978 979 asoc = &stcb->asoc; 980 /* process according to association state */ 981 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) || 982 (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) { 983 /* unexpected SHUTDOWN-ACK... do OOTB handling... */ 984 sctp_send_shutdown_complete(stcb, net, 1); 985 SCTP_TCB_UNLOCK(stcb); 986 return; 987 } 988 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) && 989 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) { 990 /* unexpected SHUTDOWN-ACK... so ignore... */ 991 SCTP_TCB_UNLOCK(stcb); 992 return; 993 } 994 if (asoc->control_pdapi) { 995 /* 996 * With a normal shutdown we assume the end of last record. 997 */ 998 SCTP_INP_READ_LOCK(stcb->sctp_ep); 999 asoc->control_pdapi->end_added = 1; 1000 asoc->control_pdapi->pdapi_aborted = 1; 1001 asoc->control_pdapi = NULL; 1002 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 1003#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1004 atomic_add_int(&stcb->asoc.refcnt, 1); 1005 SCTP_TCB_UNLOCK(stcb); 1006 SCTP_SOCKET_LOCK(so, 1); 1007 SCTP_TCB_LOCK(stcb); 1008 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1009 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1010 /* assoc was freed while we were unlocked */ 1011 SCTP_SOCKET_UNLOCK(so, 1); 1012 return; 1013 } 1014#endif 1015 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 1016#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1017 SCTP_SOCKET_UNLOCK(so, 1); 1018#endif 1019 } 1020#ifdef INVARIANTS 1021 if (!TAILQ_EMPTY(&asoc->send_queue) || 1022 !TAILQ_EMPTY(&asoc->sent_queue) || 1023 !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 1024 panic("Queues are not empty when handling SHUTDOWN-ACK"); 1025 } 1026#endif 1027 /* stop the timer */ 1028 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9); 1029 /* send SHUTDOWN-COMPLETE */ 1030 sctp_send_shutdown_complete(stcb, net, 0); 1031 /* notify upper layer protocol */ 1032 if (stcb->sctp_socket) { 1033 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1034 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 1035 stcb->sctp_socket->so_snd.sb_cc = 0; 1036 } 1037 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 1038 } 1039 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 1040 /* free the TCB but first save off the ep */ 1041#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1042 atomic_add_int(&stcb->asoc.refcnt, 1); 1043 SCTP_TCB_UNLOCK(stcb); 1044 SCTP_SOCKET_LOCK(so, 1); 1045 SCTP_TCB_LOCK(stcb); 1046 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1047#endif 1048 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1049 SCTP_FROM_SCTP_INPUT + SCTP_LOC_10); 1050#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1051 SCTP_SOCKET_UNLOCK(so, 1); 1052#endif 1053} 1054 1055/* 1056 * Skip past the param header and then we will find the chunk that caused the 1057 * problem. There are two possiblities ASCONF or FWD-TSN other than that and 1058 * our peer must be broken. 1059 */ 1060static void 1061sctp_process_unrecog_chunk(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr, 1062 struct sctp_nets *net) 1063{ 1064 struct sctp_chunkhdr *chk; 1065 1066 chk = (struct sctp_chunkhdr *)((caddr_t)phdr + sizeof(*phdr)); 1067 switch (chk->chunk_type) { 1068 case SCTP_ASCONF_ACK: 1069 case SCTP_ASCONF: 1070 sctp_asconf_cleanup(stcb, net); 1071 break; 1072 case SCTP_FORWARD_CUM_TSN: 1073 stcb->asoc.prsctp_supported = 0; 1074 break; 1075 default: 1076 SCTPDBG(SCTP_DEBUG_INPUT2, 1077 "Peer does not support chunk type %d(%x)??\n", 1078 chk->chunk_type, (uint32_t) chk->chunk_type); 1079 break; 1080 } 1081} 1082 1083/* 1084 * Skip past the param header and then we will find the param that caused the 1085 * problem. There are a number of param's in a ASCONF OR the prsctp param 1086 * these will turn of specific features. 1087 * XXX: Is this the right thing to do? 1088 */ 1089static void 1090sctp_process_unrecog_param(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr) 1091{ 1092 struct sctp_paramhdr *pbad; 1093 1094 pbad = phdr + 1; 1095 switch (ntohs(pbad->param_type)) { 1096 /* pr-sctp draft */ 1097 case SCTP_PRSCTP_SUPPORTED: 1098 stcb->asoc.prsctp_supported = 0; 1099 break; 1100 case SCTP_SUPPORTED_CHUNK_EXT: 1101 break; 1102 /* draft-ietf-tsvwg-addip-sctp */ 1103 case SCTP_HAS_NAT_SUPPORT: 1104 stcb->asoc.peer_supports_nat = 0; 1105 break; 1106 case SCTP_ADD_IP_ADDRESS: 1107 case SCTP_DEL_IP_ADDRESS: 1108 case SCTP_SET_PRIM_ADDR: 1109 stcb->asoc.asconf_supported = 0; 1110 break; 1111 case SCTP_SUCCESS_REPORT: 1112 case SCTP_ERROR_CAUSE_IND: 1113 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n"); 1114 SCTPDBG(SCTP_DEBUG_INPUT2, 1115 "Turning off ASCONF to this strange peer\n"); 1116 stcb->asoc.asconf_supported = 0; 1117 break; 1118 default: 1119 SCTPDBG(SCTP_DEBUG_INPUT2, 1120 "Peer does not support param type %d(%x)??\n", 1121 pbad->param_type, (uint32_t) pbad->param_type); 1122 break; 1123 } 1124} 1125 1126static int 1127sctp_handle_error(struct sctp_chunkhdr *ch, 1128 struct sctp_tcb *stcb, struct sctp_nets *net) 1129{ 1130 int chklen; 1131 struct sctp_paramhdr *phdr; 1132 uint16_t error, error_type; 1133 uint16_t error_len; 1134 struct sctp_association *asoc; 1135 int adjust; 1136 1137#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1138 struct socket *so; 1139 1140#endif 1141 1142 /* parse through all of the errors and process */ 1143 asoc = &stcb->asoc; 1144 phdr = (struct sctp_paramhdr *)((caddr_t)ch + 1145 sizeof(struct sctp_chunkhdr)); 1146 chklen = ntohs(ch->chunk_length) - sizeof(struct sctp_chunkhdr); 1147 error = 0; 1148 while ((size_t)chklen >= sizeof(struct sctp_paramhdr)) { 1149 /* Process an Error Cause */ 1150 error_type = ntohs(phdr->param_type); 1151 error_len = ntohs(phdr->param_length); 1152 if ((error_len > chklen) || (error_len == 0)) { 1153 /* invalid param length for this param */ 1154 SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in error param- chunk left:%d errorlen:%d\n", 1155 chklen, error_len); 1156 return (0); 1157 } 1158 if (error == 0) { 1159 /* report the first error cause */ 1160 error = error_type; 1161 } 1162 switch (error_type) { 1163 case SCTP_CAUSE_INVALID_STREAM: 1164 case SCTP_CAUSE_MISSING_PARAM: 1165 case SCTP_CAUSE_INVALID_PARAM: 1166 case SCTP_CAUSE_NO_USER_DATA: 1167 SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %d back? We have a bug :/ (or do they?)\n", 1168 error_type); 1169 break; 1170 case SCTP_CAUSE_NAT_COLLIDING_STATE: 1171 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n", 1172 ch->chunk_flags); 1173 if (sctp_handle_nat_colliding_state(stcb)) { 1174 return (0); 1175 } 1176 break; 1177 case SCTP_CAUSE_NAT_MISSING_STATE: 1178 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n", 1179 ch->chunk_flags); 1180 if (sctp_handle_nat_missing_state(stcb, net)) { 1181 return (0); 1182 } 1183 break; 1184 case SCTP_CAUSE_STALE_COOKIE: 1185 /* 1186 * We only act if we have echoed a cookie and are 1187 * waiting. 1188 */ 1189 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) { 1190 int *p; 1191 1192 p = (int *)((caddr_t)phdr + sizeof(*phdr)); 1193 /* Save the time doubled */ 1194 asoc->cookie_preserve_req = ntohl(*p) << 1; 1195 asoc->stale_cookie_count++; 1196 if (asoc->stale_cookie_count > 1197 asoc->max_init_times) { 1198 sctp_abort_notification(stcb, 0, 0, NULL, SCTP_SO_NOT_LOCKED); 1199 /* now free the asoc */ 1200#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1201 so = SCTP_INP_SO(stcb->sctp_ep); 1202 atomic_add_int(&stcb->asoc.refcnt, 1); 1203 SCTP_TCB_UNLOCK(stcb); 1204 SCTP_SOCKET_LOCK(so, 1); 1205 SCTP_TCB_LOCK(stcb); 1206 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1207#endif 1208 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1209 SCTP_FROM_SCTP_INPUT + SCTP_LOC_11); 1210#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1211 SCTP_SOCKET_UNLOCK(so, 1); 1212#endif 1213 return (-1); 1214 } 1215 /* blast back to INIT state */ 1216 sctp_toss_old_cookies(stcb, &stcb->asoc); 1217 asoc->state &= ~SCTP_STATE_COOKIE_ECHOED; 1218 asoc->state |= SCTP_STATE_COOKIE_WAIT; 1219 sctp_stop_all_cookie_timers(stcb); 1220 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 1221 } 1222 break; 1223 case SCTP_CAUSE_UNRESOLVABLE_ADDR: 1224 /* 1225 * Nothing we can do here, we don't do hostname 1226 * addresses so if the peer does not like my IPv6 1227 * (or IPv4 for that matter) it does not matter. If 1228 * they don't support that type of address, they can 1229 * NOT possibly get that packet type... i.e. with no 1230 * IPv6 you can't recieve a IPv6 packet. so we can 1231 * safely ignore this one. If we ever added support 1232 * for HOSTNAME Addresses, then we would need to do 1233 * something here. 1234 */ 1235 break; 1236 case SCTP_CAUSE_UNRECOG_CHUNK: 1237 sctp_process_unrecog_chunk(stcb, phdr, net); 1238 break; 1239 case SCTP_CAUSE_UNRECOG_PARAM: 1240 sctp_process_unrecog_param(stcb, phdr); 1241 break; 1242 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN: 1243 /* 1244 * We ignore this since the timer will drive out a 1245 * new cookie anyway and there timer will drive us 1246 * to send a SHUTDOWN_COMPLETE. We can't send one 1247 * here since we don't have their tag. 1248 */ 1249 break; 1250 case SCTP_CAUSE_DELETING_LAST_ADDR: 1251 case SCTP_CAUSE_RESOURCE_SHORTAGE: 1252 case SCTP_CAUSE_DELETING_SRC_ADDR: 1253 /* 1254 * We should NOT get these here, but in a 1255 * ASCONF-ACK. 1256 */ 1257 SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a Operational Error?<%d>?\n", 1258 error_type); 1259 break; 1260 case SCTP_CAUSE_OUT_OF_RESC: 1261 /* 1262 * And what, pray tell do we do with the fact that 1263 * the peer is out of resources? Not really sure we 1264 * could do anything but abort. I suspect this 1265 * should have came WITH an abort instead of in a 1266 * OP-ERROR. 1267 */ 1268 break; 1269 default: 1270 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown error type = 0x%xh\n", 1271 error_type); 1272 break; 1273 } 1274 adjust = SCTP_SIZE32(error_len); 1275 chklen -= adjust; 1276 phdr = (struct sctp_paramhdr *)((caddr_t)phdr + adjust); 1277 } 1278 sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, error, ch, SCTP_SO_NOT_LOCKED); 1279 return (0); 1280} 1281 1282static int 1283sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset, 1284 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 1285 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 1286 struct sctp_nets *net, int *abort_no_unlock, 1287 uint8_t mflowtype, uint32_t mflowid, 1288 uint32_t vrf_id) 1289{ 1290 struct sctp_init_ack *init_ack; 1291 struct mbuf *op_err; 1292 1293 SCTPDBG(SCTP_DEBUG_INPUT2, 1294 "sctp_handle_init_ack: handling INIT-ACK\n"); 1295 1296 if (stcb == NULL) { 1297 SCTPDBG(SCTP_DEBUG_INPUT2, 1298 "sctp_handle_init_ack: TCB is null\n"); 1299 return (-1); 1300 } 1301 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) { 1302 /* Invalid length */ 1303 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1304 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1305 src, dst, sh, op_err, 1306 mflowtype, mflowid, 1307 vrf_id, net->port); 1308 *abort_no_unlock = 1; 1309 return (-1); 1310 } 1311 init_ack = &cp->init; 1312 /* validate parameters */ 1313 if (init_ack->initiate_tag == 0) { 1314 /* protocol error... send an abort */ 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 mflowtype, mflowid, 1319 vrf_id, net->port); 1320 *abort_no_unlock = 1; 1321 return (-1); 1322 } 1323 if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) { 1324 /* protocol error... send an abort */ 1325 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1326 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1327 src, dst, sh, op_err, 1328 mflowtype, mflowid, 1329 vrf_id, net->port); 1330 *abort_no_unlock = 1; 1331 return (-1); 1332 } 1333 if (init_ack->num_inbound_streams == 0) { 1334 /* protocol error... send an abort */ 1335 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1336 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1337 src, dst, sh, op_err, 1338 mflowtype, mflowid, 1339 vrf_id, net->port); 1340 *abort_no_unlock = 1; 1341 return (-1); 1342 } 1343 if (init_ack->num_outbound_streams == 0) { 1344 /* protocol error... send an abort */ 1345 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1346 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1347 src, dst, sh, op_err, 1348 mflowtype, mflowid, 1349 vrf_id, net->port); 1350 *abort_no_unlock = 1; 1351 return (-1); 1352 } 1353 /* process according to association state... */ 1354 switch (stcb->asoc.state & SCTP_STATE_MASK) { 1355 case SCTP_STATE_COOKIE_WAIT: 1356 /* this is the expected state for this chunk */ 1357 /* process the INIT-ACK parameters */ 1358 if (stcb->asoc.primary_destination->dest_state & 1359 SCTP_ADDR_UNCONFIRMED) { 1360 /* 1361 * The primary is where we sent the INIT, we can 1362 * always consider it confirmed when the INIT-ACK is 1363 * returned. Do this before we load addresses 1364 * though. 1365 */ 1366 stcb->asoc.primary_destination->dest_state &= 1367 ~SCTP_ADDR_UNCONFIRMED; 1368 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 1369 stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED); 1370 } 1371 if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb, 1372 net, abort_no_unlock, 1373 mflowtype, mflowid, 1374 vrf_id) < 0) { 1375 /* error in parsing parameters */ 1376 return (-1); 1377 } 1378 /* update our state */ 1379 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n"); 1380 SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_ECHOED); 1381 1382 /* reset the RTO calc */ 1383 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 1384 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 1385 stcb->asoc.overall_error_count, 1386 0, 1387 SCTP_FROM_SCTP_INPUT, 1388 __LINE__); 1389 } 1390 stcb->asoc.overall_error_count = 0; 1391 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 1392 /* 1393 * collapse the init timer back in case of a exponential 1394 * backoff 1395 */ 1396 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep, 1397 stcb, net); 1398 /* 1399 * the send at the end of the inbound data processing will 1400 * cause the cookie to be sent 1401 */ 1402 break; 1403 case SCTP_STATE_SHUTDOWN_SENT: 1404 /* incorrect state... discard */ 1405 break; 1406 case SCTP_STATE_COOKIE_ECHOED: 1407 /* incorrect state... discard */ 1408 break; 1409 case SCTP_STATE_OPEN: 1410 /* incorrect state... discard */ 1411 break; 1412 case SCTP_STATE_EMPTY: 1413 case SCTP_STATE_INUSE: 1414 default: 1415 /* incorrect state... discard */ 1416 return (-1); 1417 break; 1418 } 1419 SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n"); 1420 return (0); 1421} 1422 1423static struct sctp_tcb * 1424sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1425 struct sockaddr *src, struct sockaddr *dst, 1426 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1427 struct sctp_inpcb *inp, struct sctp_nets **netp, 1428 struct sockaddr *init_src, int *notification, 1429 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1430 uint8_t mflowtype, uint32_t mflowid, 1431 uint32_t vrf_id, uint16_t port); 1432 1433 1434/* 1435 * handle a state cookie for an existing association m: input packet mbuf 1436 * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a 1437 * "split" mbuf and the cookie signature does not exist offset: offset into 1438 * mbuf to the cookie-echo chunk 1439 */ 1440static struct sctp_tcb * 1441sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset, 1442 struct sockaddr *src, struct sockaddr *dst, 1443 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1444 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp, 1445 struct sockaddr *init_src, int *notification, 1446 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1447 uint8_t mflowtype, uint32_t mflowid, 1448 uint32_t vrf_id, uint16_t port) 1449{ 1450 struct sctp_association *asoc; 1451 struct sctp_init_chunk *init_cp, init_buf; 1452 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1453 struct sctp_nets *net; 1454 struct mbuf *op_err; 1455 int init_offset, initack_offset, i; 1456 int retval; 1457 int spec_flag = 0; 1458 uint32_t how_indx; 1459 1460#if defined(SCTP_DETAILED_STR_STATS) 1461 int j; 1462 1463#endif 1464 1465 net = *netp; 1466 /* I know that the TCB is non-NULL from the caller */ 1467 asoc = &stcb->asoc; 1468 for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) { 1469 if (asoc->cookie_how[how_indx] == 0) 1470 break; 1471 } 1472 if (how_indx < sizeof(asoc->cookie_how)) { 1473 asoc->cookie_how[how_indx] = 1; 1474 } 1475 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 1476 /* SHUTDOWN came in after sending INIT-ACK */ 1477 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination); 1478 op_err = sctp_generate_cause(SCTP_CAUSE_COOKIE_IN_SHUTDOWN, ""); 1479 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 1480 mflowtype, mflowid, 1481 vrf_id, net->port); 1482 if (how_indx < sizeof(asoc->cookie_how)) 1483 asoc->cookie_how[how_indx] = 2; 1484 return (NULL); 1485 } 1486 /* 1487 * find and validate the INIT chunk in the cookie (peer's info) the 1488 * INIT should start after the cookie-echo header struct (chunk 1489 * header, state cookie header struct) 1490 */ 1491 init_offset = offset += sizeof(struct sctp_cookie_echo_chunk); 1492 1493 init_cp = (struct sctp_init_chunk *) 1494 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 1495 (uint8_t *) & init_buf); 1496 if (init_cp == NULL) { 1497 /* could not pull a INIT chunk in cookie */ 1498 return (NULL); 1499 } 1500 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 1501 return (NULL); 1502 } 1503 /* 1504 * find and validate the INIT-ACK chunk in the cookie (my info) the 1505 * INIT-ACK follows the INIT chunk 1506 */ 1507 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 1508 initack_cp = (struct sctp_init_ack_chunk *) 1509 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 1510 (uint8_t *) & initack_buf); 1511 if (initack_cp == NULL) { 1512 /* could not pull INIT-ACK chunk in cookie */ 1513 return (NULL); 1514 } 1515 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 1516 return (NULL); 1517 } 1518 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1519 (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) { 1520 /* 1521 * case D in Section 5.2.4 Table 2: MMAA process accordingly 1522 * to get into the OPEN state 1523 */ 1524 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1525 /*- 1526 * Opps, this means that we somehow generated two vtag's 1527 * the same. I.e. we did: 1528 * Us Peer 1529 * <---INIT(tag=a)------ 1530 * ----INIT-ACK(tag=t)--> 1531 * ----INIT(tag=t)------> *1 1532 * <---INIT-ACK(tag=a)--- 1533 * <----CE(tag=t)------------- *2 1534 * 1535 * At point *1 we should be generating a different 1536 * tag t'. Which means we would throw away the CE and send 1537 * ours instead. Basically this is case C (throw away side). 1538 */ 1539 if (how_indx < sizeof(asoc->cookie_how)) 1540 asoc->cookie_how[how_indx] = 17; 1541 return (NULL); 1542 1543 } 1544 switch (SCTP_GET_STATE(asoc)) { 1545 case SCTP_STATE_COOKIE_WAIT: 1546 case SCTP_STATE_COOKIE_ECHOED: 1547 /* 1548 * INIT was sent but got a COOKIE_ECHO with the 1549 * correct tags... just accept it...but we must 1550 * process the init so that we can make sure we have 1551 * the right seq no's. 1552 */ 1553 /* First we must process the INIT !! */ 1554 retval = sctp_process_init(init_cp, stcb); 1555 if (retval < 0) { 1556 if (how_indx < sizeof(asoc->cookie_how)) 1557 asoc->cookie_how[how_indx] = 3; 1558 return (NULL); 1559 } 1560 /* we have already processed the INIT so no problem */ 1561 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, 1562 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_12); 1563 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_13); 1564 /* update current state */ 1565 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) 1566 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1567 else 1568 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1569 1570 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1571 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1572 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1573 stcb->sctp_ep, stcb, asoc->primary_destination); 1574 } 1575 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1576 sctp_stop_all_cookie_timers(stcb); 1577 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1578 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1579 (inp->sctp_socket->so_qlimit == 0) 1580 ) { 1581#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1582 struct socket *so; 1583 1584#endif 1585 /* 1586 * Here is where collision would go if we 1587 * did a connect() and instead got a 1588 * init/init-ack/cookie done before the 1589 * init-ack came back.. 1590 */ 1591 stcb->sctp_ep->sctp_flags |= 1592 SCTP_PCB_FLAGS_CONNECTED; 1593#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1594 so = SCTP_INP_SO(stcb->sctp_ep); 1595 atomic_add_int(&stcb->asoc.refcnt, 1); 1596 SCTP_TCB_UNLOCK(stcb); 1597 SCTP_SOCKET_LOCK(so, 1); 1598 SCTP_TCB_LOCK(stcb); 1599 atomic_add_int(&stcb->asoc.refcnt, -1); 1600 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1601 SCTP_SOCKET_UNLOCK(so, 1); 1602 return (NULL); 1603 } 1604#endif 1605 soisconnected(stcb->sctp_socket); 1606#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1607 SCTP_SOCKET_UNLOCK(so, 1); 1608#endif 1609 } 1610 /* notify upper layer */ 1611 *notification = SCTP_NOTIFY_ASSOC_UP; 1612 /* 1613 * since we did not send a HB make sure we don't 1614 * double things 1615 */ 1616 net->hb_responded = 1; 1617 net->RTO = sctp_calculate_rto(stcb, asoc, net, 1618 &cookie->time_entered, 1619 sctp_align_unsafe_makecopy, 1620 SCTP_RTT_FROM_NON_DATA); 1621 1622 if (stcb->asoc.sctp_autoclose_ticks && 1623 (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) { 1624 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 1625 inp, stcb, NULL); 1626 } 1627 break; 1628 default: 1629 /* 1630 * we're in the OPEN state (or beyond), so peer must 1631 * have simply lost the COOKIE-ACK 1632 */ 1633 break; 1634 } /* end switch */ 1635 sctp_stop_all_cookie_timers(stcb); 1636 /* 1637 * We ignore the return code here.. not sure if we should 1638 * somehow abort.. but we do have an existing asoc. This 1639 * really should not fail. 1640 */ 1641 if (sctp_load_addresses_from_init(stcb, m, 1642 init_offset + sizeof(struct sctp_init_chunk), 1643 initack_offset, src, dst, init_src)) { 1644 if (how_indx < sizeof(asoc->cookie_how)) 1645 asoc->cookie_how[how_indx] = 4; 1646 return (NULL); 1647 } 1648 /* respond with a COOKIE-ACK */ 1649 sctp_toss_old_cookies(stcb, asoc); 1650 sctp_send_cookie_ack(stcb); 1651 if (how_indx < sizeof(asoc->cookie_how)) 1652 asoc->cookie_how[how_indx] = 5; 1653 return (stcb); 1654 } 1655 if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1656 ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag && 1657 cookie->tie_tag_my_vtag == 0 && 1658 cookie->tie_tag_peer_vtag == 0) { 1659 /* 1660 * case C in Section 5.2.4 Table 2: XMOO silently discard 1661 */ 1662 if (how_indx < sizeof(asoc->cookie_how)) 1663 asoc->cookie_how[how_indx] = 6; 1664 return (NULL); 1665 } 1666 /* 1667 * If nat support, and the below and stcb is established, send back 1668 * a ABORT(colliding state) if we are established. 1669 */ 1670 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) && 1671 (asoc->peer_supports_nat) && 1672 ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1673 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1674 (asoc->peer_vtag == 0)))) { 1675 /* 1676 * Special case - Peer's support nat. We may have two init's 1677 * that we gave out the same tag on since one was not 1678 * established.. i.e. we get INIT from host-1 behind the nat 1679 * and we respond tag-a, we get a INIT from host-2 behind 1680 * the nat and we get tag-a again. Then we bring up host-1 1681 * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1). 1682 * Now we have colliding state. We must send an abort here 1683 * with colliding state indication. 1684 */ 1685 op_err = sctp_generate_cause(SCTP_CAUSE_NAT_COLLIDING_STATE, ""); 1686 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err, 1687 mflowtype, mflowid, 1688 vrf_id, port); 1689 return (NULL); 1690 } 1691 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1692 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1693 (asoc->peer_vtag == 0))) { 1694 /* 1695 * case B in Section 5.2.4 Table 2: MXAA or MOAA my info 1696 * should be ok, re-accept peer info 1697 */ 1698 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1699 /* 1700 * Extension of case C. If we hit this, then the 1701 * random number generator returned the same vtag 1702 * when we first sent our INIT-ACK and when we later 1703 * sent our INIT. The side with the seq numbers that 1704 * are different will be the one that normnally 1705 * would have hit case C. This in effect "extends" 1706 * our vtags in this collision case to be 64 bits. 1707 * The same collision could occur aka you get both 1708 * vtag and seq number the same twice in a row.. but 1709 * is much less likely. If it did happen then we 1710 * would proceed through and bring up the assoc.. we 1711 * may end up with the wrong stream setup however.. 1712 * which would be bad.. but there is no way to 1713 * tell.. until we send on a stream that does not 1714 * exist :-) 1715 */ 1716 if (how_indx < sizeof(asoc->cookie_how)) 1717 asoc->cookie_how[how_indx] = 7; 1718 1719 return (NULL); 1720 } 1721 if (how_indx < sizeof(asoc->cookie_how)) 1722 asoc->cookie_how[how_indx] = 8; 1723 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_14); 1724 sctp_stop_all_cookie_timers(stcb); 1725 /* 1726 * since we did not send a HB make sure we don't double 1727 * things 1728 */ 1729 net->hb_responded = 1; 1730 if (stcb->asoc.sctp_autoclose_ticks && 1731 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 1732 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, 1733 NULL); 1734 } 1735 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1736 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 1737 1738 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) { 1739 /* 1740 * Ok the peer probably discarded our data (if we 1741 * echoed a cookie+data). So anything on the 1742 * sent_queue should be marked for retransmit, we 1743 * may not get something to kick us so it COULD 1744 * still take a timeout to move these.. but it can't 1745 * hurt to mark them. 1746 */ 1747 struct sctp_tmit_chunk *chk; 1748 1749 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 1750 if (chk->sent < SCTP_DATAGRAM_RESEND) { 1751 chk->sent = SCTP_DATAGRAM_RESEND; 1752 sctp_flight_size_decrease(chk); 1753 sctp_total_flight_decrease(stcb, chk); 1754 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 1755 spec_flag++; 1756 } 1757 } 1758 1759 } 1760 /* process the INIT info (peer's info) */ 1761 retval = sctp_process_init(init_cp, stcb); 1762 if (retval < 0) { 1763 if (how_indx < sizeof(asoc->cookie_how)) 1764 asoc->cookie_how[how_indx] = 9; 1765 return (NULL); 1766 } 1767 if (sctp_load_addresses_from_init(stcb, m, 1768 init_offset + sizeof(struct sctp_init_chunk), 1769 initack_offset, src, dst, init_src)) { 1770 if (how_indx < sizeof(asoc->cookie_how)) 1771 asoc->cookie_how[how_indx] = 10; 1772 return (NULL); 1773 } 1774 if ((asoc->state & SCTP_STATE_COOKIE_WAIT) || 1775 (asoc->state & SCTP_STATE_COOKIE_ECHOED)) { 1776 *notification = SCTP_NOTIFY_ASSOC_UP; 1777 1778 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1779 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1780 (inp->sctp_socket->so_qlimit == 0)) { 1781#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1782 struct socket *so; 1783 1784#endif 1785 stcb->sctp_ep->sctp_flags |= 1786 SCTP_PCB_FLAGS_CONNECTED; 1787#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1788 so = SCTP_INP_SO(stcb->sctp_ep); 1789 atomic_add_int(&stcb->asoc.refcnt, 1); 1790 SCTP_TCB_UNLOCK(stcb); 1791 SCTP_SOCKET_LOCK(so, 1); 1792 SCTP_TCB_LOCK(stcb); 1793 atomic_add_int(&stcb->asoc.refcnt, -1); 1794 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1795 SCTP_SOCKET_UNLOCK(so, 1); 1796 return (NULL); 1797 } 1798#endif 1799 soisconnected(stcb->sctp_socket); 1800#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1801 SCTP_SOCKET_UNLOCK(so, 1); 1802#endif 1803 } 1804 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) 1805 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1806 else 1807 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1808 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1809 } else if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) { 1810 SCTP_STAT_INCR_COUNTER32(sctps_restartestab); 1811 } else { 1812 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1813 } 1814 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1815 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1816 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1817 stcb->sctp_ep, stcb, asoc->primary_destination); 1818 } 1819 sctp_stop_all_cookie_timers(stcb); 1820 sctp_toss_old_cookies(stcb, asoc); 1821 sctp_send_cookie_ack(stcb); 1822 if (spec_flag) { 1823 /* 1824 * only if we have retrans set do we do this. What 1825 * this call does is get only the COOKIE-ACK out and 1826 * then when we return the normal call to 1827 * sctp_chunk_output will get the retrans out behind 1828 * this. 1829 */ 1830 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED); 1831 } 1832 if (how_indx < sizeof(asoc->cookie_how)) 1833 asoc->cookie_how[how_indx] = 11; 1834 1835 return (stcb); 1836 } 1837 if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1838 ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) && 1839 cookie->tie_tag_my_vtag == asoc->my_vtag_nonce && 1840 cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce && 1841 cookie->tie_tag_peer_vtag != 0) { 1842 struct sctpasochead *head; 1843 1844#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1845 struct socket *so; 1846 1847#endif 1848 1849 if (asoc->peer_supports_nat) { 1850 /* 1851 * This is a gross gross hack. Just call the 1852 * cookie_new code since we are allowing a duplicate 1853 * association. I hope this works... 1854 */ 1855 return (sctp_process_cookie_new(m, iphlen, offset, src, dst, 1856 sh, cookie, cookie_len, 1857 inp, netp, init_src, notification, 1858 auth_skipped, auth_offset, auth_len, 1859 mflowtype, mflowid, 1860 vrf_id, port)); 1861 } 1862 /* 1863 * case A in Section 5.2.4 Table 2: XXMM (peer restarted) 1864 */ 1865 /* temp code */ 1866 if (how_indx < sizeof(asoc->cookie_how)) 1867 asoc->cookie_how[how_indx] = 12; 1868 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_15); 1869 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 1870 1871 /* notify upper layer */ 1872 *notification = SCTP_NOTIFY_ASSOC_RESTART; 1873 atomic_add_int(&stcb->asoc.refcnt, 1); 1874 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_OPEN) && 1875 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) && 1876 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) { 1877 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1878 } 1879 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) { 1880 SCTP_STAT_INCR_GAUGE32(sctps_restartestab); 1881 } else if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) { 1882 SCTP_STAT_INCR_GAUGE32(sctps_collisionestab); 1883 } 1884 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1885 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1886 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1887 stcb->sctp_ep, stcb, asoc->primary_destination); 1888 1889 } else if (!(asoc->state & SCTP_STATE_SHUTDOWN_SENT)) { 1890 /* move to OPEN state, if not in SHUTDOWN_SENT */ 1891 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1892 } 1893 asoc->pre_open_streams = 1894 ntohs(initack_cp->init.num_outbound_streams); 1895 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 1896 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 1897 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 1898 1899 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 1900 1901 asoc->str_reset_seq_in = asoc->init_seq_number; 1902 1903 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 1904 if (asoc->mapping_array) { 1905 memset(asoc->mapping_array, 0, 1906 asoc->mapping_array_size); 1907 } 1908 if (asoc->nr_mapping_array) { 1909 memset(asoc->nr_mapping_array, 0, 1910 asoc->mapping_array_size); 1911 } 1912 SCTP_TCB_UNLOCK(stcb); 1913#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1914 so = SCTP_INP_SO(stcb->sctp_ep); 1915 SCTP_SOCKET_LOCK(so, 1); 1916#endif 1917 SCTP_INP_INFO_WLOCK(); 1918 SCTP_INP_WLOCK(stcb->sctp_ep); 1919 SCTP_TCB_LOCK(stcb); 1920 atomic_add_int(&stcb->asoc.refcnt, -1); 1921 /* send up all the data */ 1922 SCTP_TCB_SEND_LOCK(stcb); 1923 1924 sctp_report_all_outbound(stcb, 0, 1, SCTP_SO_LOCKED); 1925 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 1926 stcb->asoc.strmout[i].chunks_on_queues = 0; 1927#if defined(SCTP_DETAILED_STR_STATS) 1928 for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) { 1929 asoc->strmout[i].abandoned_sent[j] = 0; 1930 asoc->strmout[i].abandoned_unsent[j] = 0; 1931 } 1932#else 1933 asoc->strmout[i].abandoned_sent[0] = 0; 1934 asoc->strmout[i].abandoned_unsent[0] = 0; 1935#endif 1936 stcb->asoc.strmout[i].stream_no = i; 1937 stcb->asoc.strmout[i].next_sequence_send = 0; 1938 stcb->asoc.strmout[i].last_msg_incomplete = 0; 1939 } 1940 /* process the INIT-ACK info (my info) */ 1941 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 1942 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1943 1944 /* pull from vtag hash */ 1945 LIST_REMOVE(stcb, sctp_asocs); 1946 /* re-insert to new vtag position */ 1947 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, 1948 SCTP_BASE_INFO(hashasocmark))]; 1949 /* 1950 * put it in the bucket in the vtag hash of assoc's for the 1951 * system 1952 */ 1953 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 1954 1955 SCTP_TCB_SEND_UNLOCK(stcb); 1956 SCTP_INP_WUNLOCK(stcb->sctp_ep); 1957 SCTP_INP_INFO_WUNLOCK(); 1958#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1959 SCTP_SOCKET_UNLOCK(so, 1); 1960#endif 1961 asoc->total_flight = 0; 1962 asoc->total_flight_count = 0; 1963 /* process the INIT info (peer's info) */ 1964 retval = sctp_process_init(init_cp, stcb); 1965 if (retval < 0) { 1966 if (how_indx < sizeof(asoc->cookie_how)) 1967 asoc->cookie_how[how_indx] = 13; 1968 1969 return (NULL); 1970 } 1971 /* 1972 * since we did not send a HB make sure we don't double 1973 * things 1974 */ 1975 net->hb_responded = 1; 1976 1977 if (sctp_load_addresses_from_init(stcb, m, 1978 init_offset + sizeof(struct sctp_init_chunk), 1979 initack_offset, src, dst, init_src)) { 1980 if (how_indx < sizeof(asoc->cookie_how)) 1981 asoc->cookie_how[how_indx] = 14; 1982 1983 return (NULL); 1984 } 1985 /* respond with a COOKIE-ACK */ 1986 sctp_stop_all_cookie_timers(stcb); 1987 sctp_toss_old_cookies(stcb, asoc); 1988 sctp_send_cookie_ack(stcb); 1989 if (how_indx < sizeof(asoc->cookie_how)) 1990 asoc->cookie_how[how_indx] = 15; 1991 1992 return (stcb); 1993 } 1994 if (how_indx < sizeof(asoc->cookie_how)) 1995 asoc->cookie_how[how_indx] = 16; 1996 /* all other cases... */ 1997 return (NULL); 1998} 1999 2000 2001/* 2002 * handle a state cookie for a new association m: input packet mbuf chain-- 2003 * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf 2004 * and the cookie signature does not exist offset: offset into mbuf to the 2005 * cookie-echo chunk length: length of the cookie chunk to: where the init 2006 * was from returns a new TCB 2007 */ 2008static struct sctp_tcb * 2009sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 2010 struct sockaddr *src, struct sockaddr *dst, 2011 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 2012 struct sctp_inpcb *inp, struct sctp_nets **netp, 2013 struct sockaddr *init_src, int *notification, 2014 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2015 uint8_t mflowtype, uint32_t mflowid, 2016 uint32_t vrf_id, uint16_t port) 2017{ 2018 struct sctp_tcb *stcb; 2019 struct sctp_init_chunk *init_cp, init_buf; 2020 struct sctp_init_ack_chunk *initack_cp, initack_buf; 2021 union sctp_sockstore store; 2022 struct sctp_association *asoc; 2023 int init_offset, initack_offset, initack_limit; 2024 int retval; 2025 int error = 0; 2026 uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE]; 2027 2028#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2029 struct socket *so; 2030 2031 so = SCTP_INP_SO(inp); 2032#endif 2033 2034 /* 2035 * find and validate the INIT chunk in the cookie (peer's info) the 2036 * INIT should start after the cookie-echo header struct (chunk 2037 * header, state cookie header struct) 2038 */ 2039 init_offset = offset + sizeof(struct sctp_cookie_echo_chunk); 2040 init_cp = (struct sctp_init_chunk *) 2041 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 2042 (uint8_t *) & init_buf); 2043 if (init_cp == NULL) { 2044 /* could not pull a INIT chunk in cookie */ 2045 SCTPDBG(SCTP_DEBUG_INPUT1, 2046 "process_cookie_new: could not pull INIT chunk hdr\n"); 2047 return (NULL); 2048 } 2049 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 2050 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n"); 2051 return (NULL); 2052 } 2053 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 2054 /* 2055 * find and validate the INIT-ACK chunk in the cookie (my info) the 2056 * INIT-ACK follows the INIT chunk 2057 */ 2058 initack_cp = (struct sctp_init_ack_chunk *) 2059 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 2060 (uint8_t *) & initack_buf); 2061 if (initack_cp == NULL) { 2062 /* could not pull INIT-ACK chunk in cookie */ 2063 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n"); 2064 return (NULL); 2065 } 2066 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 2067 return (NULL); 2068 } 2069 /* 2070 * NOTE: We can't use the INIT_ACK's chk_length to determine the 2071 * "initack_limit" value. This is because the chk_length field 2072 * includes the length of the cookie, but the cookie is omitted when 2073 * the INIT and INIT_ACK are tacked onto the cookie... 2074 */ 2075 initack_limit = offset + cookie_len; 2076 2077 /* 2078 * now that we know the INIT/INIT-ACK are in place, create a new TCB 2079 * and popluate 2080 */ 2081 2082 /* 2083 * Here we do a trick, we set in NULL for the proc/thread argument. 2084 * We do this since in effect we only use the p argument when the 2085 * socket is unbound and we must do an implicit bind. Since we are 2086 * getting a cookie, we cannot be unbound. 2087 */ 2088 stcb = sctp_aloc_assoc(inp, init_src, &error, 2089 ntohl(initack_cp->init.initiate_tag), vrf_id, 2090 (struct thread *)NULL 2091 ); 2092 if (stcb == NULL) { 2093 struct mbuf *op_err; 2094 2095 /* memory problem? */ 2096 SCTPDBG(SCTP_DEBUG_INPUT1, 2097 "process_cookie_new: no room for another TCB!\n"); 2098 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2099 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2100 src, dst, sh, op_err, 2101 mflowtype, mflowid, 2102 vrf_id, port); 2103 return (NULL); 2104 } 2105 /* get the correct sctp_nets */ 2106 if (netp) 2107 *netp = sctp_findnet(stcb, init_src); 2108 2109 asoc = &stcb->asoc; 2110 /* get scope variables out of cookie */ 2111 asoc->scope.ipv4_local_scope = cookie->ipv4_scope; 2112 asoc->scope.site_scope = cookie->site_scope; 2113 asoc->scope.local_scope = cookie->local_scope; 2114 asoc->scope.loopback_scope = cookie->loopback_scope; 2115 2116 if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) || 2117 (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) { 2118 struct mbuf *op_err; 2119 2120 /* 2121 * Houston we have a problem. The EP changed while the 2122 * cookie was in flight. Only recourse is to abort the 2123 * association. 2124 */ 2125 atomic_add_int(&stcb->asoc.refcnt, 1); 2126 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2127 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2128 src, dst, sh, op_err, 2129 mflowtype, mflowid, 2130 vrf_id, port); 2131#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2132 SCTP_TCB_UNLOCK(stcb); 2133 SCTP_SOCKET_LOCK(so, 1); 2134 SCTP_TCB_LOCK(stcb); 2135#endif 2136 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2137 SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 2138#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2139 SCTP_SOCKET_UNLOCK(so, 1); 2140#endif 2141 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2142 return (NULL); 2143 } 2144 /* process the INIT-ACK info (my info) */ 2145 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 2146 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 2147 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 2148 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 2149 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 2150 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 2151 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 2152 asoc->str_reset_seq_in = asoc->init_seq_number; 2153 2154 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 2155 2156 /* process the INIT info (peer's info) */ 2157 if (netp) 2158 retval = sctp_process_init(init_cp, stcb); 2159 else 2160 retval = 0; 2161 if (retval < 0) { 2162 atomic_add_int(&stcb->asoc.refcnt, 1); 2163#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2164 SCTP_TCB_UNLOCK(stcb); 2165 SCTP_SOCKET_LOCK(so, 1); 2166 SCTP_TCB_LOCK(stcb); 2167#endif 2168 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 2169#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2170 SCTP_SOCKET_UNLOCK(so, 1); 2171#endif 2172 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2173 return (NULL); 2174 } 2175 /* load all addresses */ 2176 if (sctp_load_addresses_from_init(stcb, m, 2177 init_offset + sizeof(struct sctp_init_chunk), initack_offset, 2178 src, dst, init_src)) { 2179 atomic_add_int(&stcb->asoc.refcnt, 1); 2180#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2181 SCTP_TCB_UNLOCK(stcb); 2182 SCTP_SOCKET_LOCK(so, 1); 2183 SCTP_TCB_LOCK(stcb); 2184#endif 2185 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_17); 2186#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2187 SCTP_SOCKET_UNLOCK(so, 1); 2188#endif 2189 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2190 return (NULL); 2191 } 2192 /* 2193 * verify any preceding AUTH chunk that was skipped 2194 */ 2195 /* pull the local authentication parameters from the cookie/init-ack */ 2196 sctp_auth_get_cookie_params(stcb, m, 2197 initack_offset + sizeof(struct sctp_init_ack_chunk), 2198 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk))); 2199 if (auth_skipped) { 2200 struct sctp_auth_chunk *auth; 2201 2202 auth = (struct sctp_auth_chunk *) 2203 sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf); 2204 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) { 2205 /* auth HMAC failed, dump the assoc and packet */ 2206 SCTPDBG(SCTP_DEBUG_AUTH1, 2207 "COOKIE-ECHO: AUTH failed\n"); 2208 atomic_add_int(&stcb->asoc.refcnt, 1); 2209#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2210 SCTP_TCB_UNLOCK(stcb); 2211 SCTP_SOCKET_LOCK(so, 1); 2212 SCTP_TCB_LOCK(stcb); 2213#endif 2214 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_18); 2215#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2216 SCTP_SOCKET_UNLOCK(so, 1); 2217#endif 2218 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2219 return (NULL); 2220 } else { 2221 /* remaining chunks checked... good to go */ 2222 stcb->asoc.authenticated = 1; 2223 } 2224 } 2225 /* update current state */ 2226 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2227 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 2228 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2229 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2230 stcb->sctp_ep, stcb, asoc->primary_destination); 2231 } 2232 sctp_stop_all_cookie_timers(stcb); 2233 SCTP_STAT_INCR_COUNTER32(sctps_passiveestab); 2234 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2235 2236 /* 2237 * if we're doing ASCONFs, check to see if we have any new local 2238 * addresses that need to get added to the peer (eg. addresses 2239 * changed while cookie echo in flight). This needs to be done 2240 * after we go to the OPEN state to do the correct asconf 2241 * processing. else, make sure we have the correct addresses in our 2242 * lists 2243 */ 2244 2245 /* warning, we re-use sin, sin6, sa_store here! */ 2246 /* pull in local_address (our "from" address) */ 2247 switch (cookie->laddr_type) { 2248#ifdef INET 2249 case SCTP_IPV4_ADDRESS: 2250 /* source addr is IPv4 */ 2251 memset(&store.sin, 0, sizeof(struct sockaddr_in)); 2252 store.sin.sin_family = AF_INET; 2253 store.sin.sin_len = sizeof(struct sockaddr_in); 2254 store.sin.sin_addr.s_addr = cookie->laddress[0]; 2255 break; 2256#endif 2257#ifdef INET6 2258 case SCTP_IPV6_ADDRESS: 2259 /* source addr is IPv6 */ 2260 memset(&store.sin6, 0, sizeof(struct sockaddr_in6)); 2261 store.sin6.sin6_family = AF_INET6; 2262 store.sin6.sin6_len = sizeof(struct sockaddr_in6); 2263 store.sin6.sin6_scope_id = cookie->scope_id; 2264 memcpy(&store.sin6.sin6_addr, cookie->laddress, sizeof(struct in6_addr)); 2265 break; 2266#endif 2267 default: 2268 atomic_add_int(&stcb->asoc.refcnt, 1); 2269#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2270 SCTP_TCB_UNLOCK(stcb); 2271 SCTP_SOCKET_LOCK(so, 1); 2272 SCTP_TCB_LOCK(stcb); 2273#endif 2274 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_19); 2275#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2276 SCTP_SOCKET_UNLOCK(so, 1); 2277#endif 2278 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2279 return (NULL); 2280 } 2281 2282 /* set up to notify upper layer */ 2283 *notification = SCTP_NOTIFY_ASSOC_UP; 2284 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2285 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 2286 (inp->sctp_socket->so_qlimit == 0)) { 2287 /* 2288 * This is an endpoint that called connect() how it got a 2289 * cookie that is NEW is a bit of a mystery. It must be that 2290 * the INIT was sent, but before it got there.. a complete 2291 * INIT/INIT-ACK/COOKIE arrived. But of course then it 2292 * should have went to the other code.. not here.. oh well.. 2293 * a bit of protection is worth having.. 2294 */ 2295 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2296#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2297 atomic_add_int(&stcb->asoc.refcnt, 1); 2298 SCTP_TCB_UNLOCK(stcb); 2299 SCTP_SOCKET_LOCK(so, 1); 2300 SCTP_TCB_LOCK(stcb); 2301 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2302 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2303 SCTP_SOCKET_UNLOCK(so, 1); 2304 return (NULL); 2305 } 2306#endif 2307 soisconnected(stcb->sctp_socket); 2308#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2309 SCTP_SOCKET_UNLOCK(so, 1); 2310#endif 2311 } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 2312 (inp->sctp_socket->so_qlimit)) { 2313 /* 2314 * We don't want to do anything with this one. Since it is 2315 * the listening guy. The timer will get started for 2316 * accepted connections in the caller. 2317 */ 2318 ; 2319 } 2320 /* since we did not send a HB make sure we don't double things */ 2321 if ((netp) && (*netp)) 2322 (*netp)->hb_responded = 1; 2323 2324 if (stcb->asoc.sctp_autoclose_ticks && 2325 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2326 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL); 2327 } 2328 /* calculate the RTT */ 2329 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 2330 if ((netp) && (*netp)) { 2331 (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp, 2332 &cookie->time_entered, sctp_align_unsafe_makecopy, 2333 SCTP_RTT_FROM_NON_DATA); 2334 } 2335 /* respond with a COOKIE-ACK */ 2336 sctp_send_cookie_ack(stcb); 2337 2338 /* 2339 * check the address lists for any ASCONFs that need to be sent 2340 * AFTER the cookie-ack is sent 2341 */ 2342 sctp_check_address_list(stcb, m, 2343 initack_offset + sizeof(struct sctp_init_ack_chunk), 2344 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)), 2345 &store.sa, cookie->local_scope, cookie->site_scope, 2346 cookie->ipv4_scope, cookie->loopback_scope); 2347 2348 2349 return (stcb); 2350} 2351 2352/* 2353 * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e 2354 * we NEED to make sure we are not already using the vtag. If so we 2355 * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit! 2356 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag, 2357 SCTP_BASE_INFO(hashasocmark))]; 2358 LIST_FOREACH(stcb, head, sctp_asocs) { 2359 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep)) { 2360 -- SEND ABORT - TRY AGAIN -- 2361 } 2362 } 2363*/ 2364 2365/* 2366 * handles a COOKIE-ECHO message stcb: modified to either a new or left as 2367 * existing (non-NULL) TCB 2368 */ 2369static struct mbuf * 2370sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset, 2371 struct sockaddr *src, struct sockaddr *dst, 2372 struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp, 2373 struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp, 2374 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2375 struct sctp_tcb **locked_tcb, 2376 uint8_t mflowtype, uint32_t mflowid, 2377 uint32_t vrf_id, uint16_t port) 2378{ 2379 struct sctp_state_cookie *cookie; 2380 struct sctp_tcb *l_stcb = *stcb; 2381 struct sctp_inpcb *l_inp; 2382 struct sockaddr *to; 2383 struct sctp_pcb *ep; 2384 struct mbuf *m_sig; 2385 uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE]; 2386 uint8_t *sig; 2387 uint8_t cookie_ok = 0; 2388 unsigned int sig_offset, cookie_offset; 2389 unsigned int cookie_len; 2390 struct timeval now; 2391 struct timeval time_expires; 2392 int notification = 0; 2393 struct sctp_nets *netl; 2394 int had_a_existing_tcb = 0; 2395 int send_int_conf = 0; 2396 2397#ifdef INET 2398 struct sockaddr_in sin; 2399 2400#endif 2401#ifdef INET6 2402 struct sockaddr_in6 sin6; 2403 2404#endif 2405 2406 SCTPDBG(SCTP_DEBUG_INPUT2, 2407 "sctp_handle_cookie: handling COOKIE-ECHO\n"); 2408 2409 if (inp_p == NULL) { 2410 return (NULL); 2411 } 2412 cookie = &cp->cookie; 2413 cookie_offset = offset + sizeof(struct sctp_chunkhdr); 2414 cookie_len = ntohs(cp->ch.chunk_length); 2415 2416 if ((cookie->peerport != sh->src_port) && 2417 (cookie->myport != sh->dest_port) && 2418 (cookie->my_vtag != sh->v_tag)) { 2419 /* 2420 * invalid ports or bad tag. Note that we always leave the 2421 * v_tag in the header in network order and when we stored 2422 * it in the my_vtag slot we also left it in network order. 2423 * This maintains the match even though it may be in the 2424 * opposite byte order of the machine :-> 2425 */ 2426 return (NULL); 2427 } 2428 if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) + 2429 sizeof(struct sctp_init_chunk) + 2430 sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) { 2431 /* cookie too small */ 2432 return (NULL); 2433 } 2434 /* 2435 * split off the signature into its own mbuf (since it should not be 2436 * calculated in the sctp_hmac_m() call). 2437 */ 2438 sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE; 2439 m_sig = m_split(m, sig_offset, M_NOWAIT); 2440 if (m_sig == NULL) { 2441 /* out of memory or ?? */ 2442 return (NULL); 2443 } 2444#ifdef SCTP_MBUF_LOGGING 2445 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 2446 sctp_log_mbc(m_sig, SCTP_MBUF_SPLIT); 2447 } 2448#endif 2449 2450 /* 2451 * compute the signature/digest for the cookie 2452 */ 2453 ep = &(*inp_p)->sctp_ep; 2454 l_inp = *inp_p; 2455 if (l_stcb) { 2456 SCTP_TCB_UNLOCK(l_stcb); 2457 } 2458 SCTP_INP_RLOCK(l_inp); 2459 if (l_stcb) { 2460 SCTP_TCB_LOCK(l_stcb); 2461 } 2462 /* which cookie is it? */ 2463 if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) && 2464 (ep->current_secret_number != ep->last_secret_number)) { 2465 /* it's the old cookie */ 2466 (void)sctp_hmac_m(SCTP_HMAC, 2467 (uint8_t *) ep->secret_key[(int)ep->last_secret_number], 2468 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2469 } else { 2470 /* it's the current cookie */ 2471 (void)sctp_hmac_m(SCTP_HMAC, 2472 (uint8_t *) ep->secret_key[(int)ep->current_secret_number], 2473 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2474 } 2475 /* get the signature */ 2476 SCTP_INP_RUNLOCK(l_inp); 2477 sig = (uint8_t *) sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *) & tmp_sig); 2478 if (sig == NULL) { 2479 /* couldn't find signature */ 2480 sctp_m_freem(m_sig); 2481 return (NULL); 2482 } 2483 /* compare the received digest with the computed digest */ 2484 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) { 2485 /* try the old cookie? */ 2486 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) && 2487 (ep->current_secret_number != ep->last_secret_number)) { 2488 /* compute digest with old */ 2489 (void)sctp_hmac_m(SCTP_HMAC, 2490 (uint8_t *) ep->secret_key[(int)ep->last_secret_number], 2491 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2492 /* compare */ 2493 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0) 2494 cookie_ok = 1; 2495 } 2496 } else { 2497 cookie_ok = 1; 2498 } 2499 2500 /* 2501 * Now before we continue we must reconstruct our mbuf so that 2502 * normal processing of any other chunks will work. 2503 */ 2504 { 2505 struct mbuf *m_at; 2506 2507 m_at = m; 2508 while (SCTP_BUF_NEXT(m_at) != NULL) { 2509 m_at = SCTP_BUF_NEXT(m_at); 2510 } 2511 SCTP_BUF_NEXT(m_at) = m_sig; 2512 } 2513 2514 if (cookie_ok == 0) { 2515 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n"); 2516 SCTPDBG(SCTP_DEBUG_INPUT2, 2517 "offset = %u, cookie_offset = %u, sig_offset = %u\n", 2518 (uint32_t) offset, cookie_offset, sig_offset); 2519 return (NULL); 2520 } 2521 /* 2522 * check the cookie timestamps to be sure it's not stale 2523 */ 2524 (void)SCTP_GETTIME_TIMEVAL(&now); 2525 /* Expire time is in Ticks, so we convert to seconds */ 2526 time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life); 2527 time_expires.tv_usec = cookie->time_entered.tv_usec; 2528 /* 2529 * TODO sctp_constants.h needs alternative time macros when _KERNEL 2530 * is undefined. 2531 */ 2532 if (timevalcmp(&now, &time_expires, >)) { 2533 /* cookie is stale! */ 2534 struct mbuf *op_err; 2535 struct sctp_stale_cookie_msg *scm; 2536 uint32_t tim; 2537 2538 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_stale_cookie_msg), 2539 0, M_NOWAIT, 1, MT_DATA); 2540 if (op_err == NULL) { 2541 /* FOOBAR */ 2542 return (NULL); 2543 } 2544 /* Set the len */ 2545 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_stale_cookie_msg); 2546 scm = mtod(op_err, struct sctp_stale_cookie_msg *); 2547 scm->ph.param_type = htons(SCTP_CAUSE_STALE_COOKIE); 2548 scm->ph.param_length = htons((sizeof(struct sctp_paramhdr) + 2549 (sizeof(uint32_t)))); 2550 /* seconds to usec */ 2551 tim = (now.tv_sec - time_expires.tv_sec) * 1000000; 2552 /* add in usec */ 2553 if (tim == 0) 2554 tim = now.tv_usec - cookie->time_entered.tv_usec; 2555 scm->time_usec = htonl(tim); 2556 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 2557 mflowtype, mflowid, 2558 vrf_id, port); 2559 return (NULL); 2560 } 2561 /* 2562 * Now we must see with the lookup address if we have an existing 2563 * asoc. This will only happen if we were in the COOKIE-WAIT state 2564 * and a INIT collided with us and somewhere the peer sent the 2565 * cookie on another address besides the single address our assoc 2566 * had for him. In this case we will have one of the tie-tags set at 2567 * least AND the address field in the cookie can be used to look it 2568 * up. 2569 */ 2570 to = NULL; 2571 switch (cookie->addr_type) { 2572#ifdef INET6 2573 case SCTP_IPV6_ADDRESS: 2574 memset(&sin6, 0, sizeof(sin6)); 2575 sin6.sin6_family = AF_INET6; 2576 sin6.sin6_len = sizeof(sin6); 2577 sin6.sin6_port = sh->src_port; 2578 sin6.sin6_scope_id = cookie->scope_id; 2579 memcpy(&sin6.sin6_addr.s6_addr, cookie->address, 2580 sizeof(sin6.sin6_addr.s6_addr)); 2581 to = (struct sockaddr *)&sin6; 2582 break; 2583#endif 2584#ifdef INET 2585 case SCTP_IPV4_ADDRESS: 2586 memset(&sin, 0, sizeof(sin)); 2587 sin.sin_family = AF_INET; 2588 sin.sin_len = sizeof(sin); 2589 sin.sin_port = sh->src_port; 2590 sin.sin_addr.s_addr = cookie->address[0]; 2591 to = (struct sockaddr *)&sin; 2592 break; 2593#endif 2594 default: 2595 /* This should not happen */ 2596 return (NULL); 2597 } 2598 if ((*stcb == NULL) && to) { 2599 /* Yep, lets check */ 2600 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL); 2601 if (*stcb == NULL) { 2602 /* 2603 * We should have only got back the same inp. If we 2604 * got back a different ep we have a problem. The 2605 * original findep got back l_inp and now 2606 */ 2607 if (l_inp != *inp_p) { 2608 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n"); 2609 } 2610 } else { 2611 if (*locked_tcb == NULL) { 2612 /* 2613 * In this case we found the assoc only 2614 * after we locked the create lock. This 2615 * means we are in a colliding case and we 2616 * must make sure that we unlock the tcb if 2617 * its one of the cases where we throw away 2618 * the incoming packets. 2619 */ 2620 *locked_tcb = *stcb; 2621 2622 /* 2623 * We must also increment the inp ref count 2624 * since the ref_count flags was set when we 2625 * did not find the TCB, now we found it 2626 * which reduces the refcount.. we must 2627 * raise it back out to balance it all :-) 2628 */ 2629 SCTP_INP_INCR_REF((*stcb)->sctp_ep); 2630 if ((*stcb)->sctp_ep != l_inp) { 2631 SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n", 2632 (void *)(*stcb)->sctp_ep, (void *)l_inp); 2633 } 2634 } 2635 } 2636 } 2637 if (to == NULL) { 2638 return (NULL); 2639 } 2640 cookie_len -= SCTP_SIGNATURE_SIZE; 2641 if (*stcb == NULL) { 2642 /* this is the "normal" case... get a new TCB */ 2643 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh, 2644 cookie, cookie_len, *inp_p, 2645 netp, to, ¬ification, 2646 auth_skipped, auth_offset, auth_len, 2647 mflowtype, mflowid, 2648 vrf_id, port); 2649 } else { 2650 /* this is abnormal... cookie-echo on existing TCB */ 2651 had_a_existing_tcb = 1; 2652 *stcb = sctp_process_cookie_existing(m, iphlen, offset, 2653 src, dst, sh, 2654 cookie, cookie_len, *inp_p, *stcb, netp, to, 2655 ¬ification, auth_skipped, auth_offset, auth_len, 2656 mflowtype, mflowid, 2657 vrf_id, port); 2658 } 2659 2660 if (*stcb == NULL) { 2661 /* still no TCB... must be bad cookie-echo */ 2662 return (NULL); 2663 } 2664 if ((*netp != NULL) && (mflowtype != M_HASHTYPE_NONE)) { 2665 (*netp)->flowtype = mflowtype; 2666 } 2667 /* 2668 * Ok, we built an association so confirm the address we sent the 2669 * INIT-ACK to. 2670 */ 2671 netl = sctp_findnet(*stcb, to); 2672 /* 2673 * This code should in theory NOT run but 2674 */ 2675 if (netl == NULL) { 2676 /* TSNH! Huh, why do I need to add this address here? */ 2677 if (sctp_add_remote_addr(*stcb, to, NULL, SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) { 2678 return (NULL); 2679 } 2680 netl = sctp_findnet(*stcb, to); 2681 } 2682 if (netl) { 2683 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) { 2684 netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 2685 (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL, 2686 netl); 2687 send_int_conf = 1; 2688 } 2689 } 2690 sctp_start_net_timers(*stcb); 2691 if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) { 2692 if (!had_a_existing_tcb || 2693 (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) { 2694 /* 2695 * If we have a NEW cookie or the connect never 2696 * reached the connected state during collision we 2697 * must do the TCP accept thing. 2698 */ 2699 struct socket *so, *oso; 2700 struct sctp_inpcb *inp; 2701 2702 if (notification == SCTP_NOTIFY_ASSOC_RESTART) { 2703 /* 2704 * For a restart we will keep the same 2705 * socket, no need to do anything. I THINK!! 2706 */ 2707 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2708 if (send_int_conf) { 2709 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2710 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2711 } 2712 return (m); 2713 } 2714 oso = (*inp_p)->sctp_socket; 2715 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2716 SCTP_TCB_UNLOCK((*stcb)); 2717 CURVNET_SET(oso->so_vnet); 2718 so = sonewconn(oso, 0 2719 ); 2720 CURVNET_RESTORE(); 2721 SCTP_TCB_LOCK((*stcb)); 2722 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2723 2724 if (so == NULL) { 2725 struct mbuf *op_err; 2726 2727#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2728 struct socket *pcb_so; 2729 2730#endif 2731 /* Too many sockets */ 2732 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n"); 2733 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2734 sctp_abort_association(*inp_p, NULL, m, iphlen, 2735 src, dst, sh, op_err, 2736 mflowtype, mflowid, 2737 vrf_id, port); 2738#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2739 pcb_so = SCTP_INP_SO(*inp_p); 2740 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2741 SCTP_TCB_UNLOCK((*stcb)); 2742 SCTP_SOCKET_LOCK(pcb_so, 1); 2743 SCTP_TCB_LOCK((*stcb)); 2744 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2745#endif 2746 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_20); 2747#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2748 SCTP_SOCKET_UNLOCK(pcb_so, 1); 2749#endif 2750 return (NULL); 2751 } 2752 inp = (struct sctp_inpcb *)so->so_pcb; 2753 SCTP_INP_INCR_REF(inp); 2754 /* 2755 * We add the unbound flag here so that if we get an 2756 * soabort() before we get the move_pcb done, we 2757 * will properly cleanup. 2758 */ 2759 inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE | 2760 SCTP_PCB_FLAGS_CONNECTED | 2761 SCTP_PCB_FLAGS_IN_TCPPOOL | 2762 SCTP_PCB_FLAGS_UNBOUND | 2763 (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) | 2764 SCTP_PCB_FLAGS_DONT_WAKE); 2765 inp->sctp_features = (*inp_p)->sctp_features; 2766 inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features; 2767 inp->sctp_socket = so; 2768 inp->sctp_frag_point = (*inp_p)->sctp_frag_point; 2769 inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off; 2770 inp->ecn_supported = (*inp_p)->ecn_supported; 2771 inp->prsctp_supported = (*inp_p)->prsctp_supported; 2772 inp->auth_supported = (*inp_p)->auth_supported; 2773 inp->asconf_supported = (*inp_p)->asconf_supported; 2774 inp->reconfig_supported = (*inp_p)->reconfig_supported; 2775 inp->nrsack_supported = (*inp_p)->nrsack_supported; 2776 inp->pktdrop_supported = (*inp_p)->pktdrop_supported; 2777 inp->partial_delivery_point = (*inp_p)->partial_delivery_point; 2778 inp->sctp_context = (*inp_p)->sctp_context; 2779 inp->local_strreset_support = (*inp_p)->local_strreset_support; 2780 inp->inp_starting_point_for_iterator = NULL; 2781 /* 2782 * copy in the authentication parameters from the 2783 * original endpoint 2784 */ 2785 if (inp->sctp_ep.local_hmacs) 2786 sctp_free_hmaclist(inp->sctp_ep.local_hmacs); 2787 inp->sctp_ep.local_hmacs = 2788 sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs); 2789 if (inp->sctp_ep.local_auth_chunks) 2790 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks); 2791 inp->sctp_ep.local_auth_chunks = 2792 sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks); 2793 2794 /* 2795 * Now we must move it from one hash table to 2796 * another and get the tcb in the right place. 2797 */ 2798 2799 /* 2800 * This is where the one-2-one socket is put into 2801 * the accept state waiting for the accept! 2802 */ 2803 if (*stcb) { 2804 (*stcb)->asoc.state |= SCTP_STATE_IN_ACCEPT_QUEUE; 2805 } 2806 sctp_move_pcb_and_assoc(*inp_p, inp, *stcb); 2807 2808 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2809 SCTP_TCB_UNLOCK((*stcb)); 2810 2811 sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb, 2812 0); 2813 SCTP_TCB_LOCK((*stcb)); 2814 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2815 2816 2817 /* 2818 * now we must check to see if we were aborted while 2819 * the move was going on and the lock/unlock 2820 * happened. 2821 */ 2822 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 2823 /* 2824 * yep it was, we leave the assoc attached 2825 * to the socket since the sctp_inpcb_free() 2826 * call will send an abort for us. 2827 */ 2828 SCTP_INP_DECR_REF(inp); 2829 return (NULL); 2830 } 2831 SCTP_INP_DECR_REF(inp); 2832 /* Switch over to the new guy */ 2833 *inp_p = inp; 2834 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2835 if (send_int_conf) { 2836 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2837 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2838 } 2839 /* 2840 * Pull it from the incomplete queue and wake the 2841 * guy 2842 */ 2843#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2844 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2845 SCTP_TCB_UNLOCK((*stcb)); 2846 SCTP_SOCKET_LOCK(so, 1); 2847#endif 2848 soisconnected(so); 2849#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2850 SCTP_TCB_LOCK((*stcb)); 2851 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2852 SCTP_SOCKET_UNLOCK(so, 1); 2853#endif 2854 return (m); 2855 } 2856 } 2857 if (notification) { 2858 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2859 } 2860 if (send_int_conf) { 2861 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2862 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2863 } 2864 return (m); 2865} 2866 2867static void 2868sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED, 2869 struct sctp_tcb *stcb, struct sctp_nets *net) 2870{ 2871 /* cp must not be used, others call this without a c-ack :-) */ 2872 struct sctp_association *asoc; 2873 2874 SCTPDBG(SCTP_DEBUG_INPUT2, 2875 "sctp_handle_cookie_ack: handling COOKIE-ACK\n"); 2876 if ((stcb == NULL) || (net == NULL)) { 2877 return; 2878 } 2879 asoc = &stcb->asoc; 2880 2881 sctp_stop_all_cookie_timers(stcb); 2882 /* process according to association state */ 2883 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) { 2884 /* state change only needed when I am in right state */ 2885 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2886 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 2887 sctp_start_net_timers(stcb); 2888 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2889 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2890 stcb->sctp_ep, stcb, asoc->primary_destination); 2891 2892 } 2893 /* update RTO */ 2894 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 2895 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2896 if (asoc->overall_error_count == 0) { 2897 net->RTO = sctp_calculate_rto(stcb, asoc, net, 2898 &asoc->time_entered, sctp_align_safe_nocopy, 2899 SCTP_RTT_FROM_NON_DATA); 2900 } 2901 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 2902 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2903 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2904 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 2905#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2906 struct socket *so; 2907 2908#endif 2909 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2910#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2911 so = SCTP_INP_SO(stcb->sctp_ep); 2912 atomic_add_int(&stcb->asoc.refcnt, 1); 2913 SCTP_TCB_UNLOCK(stcb); 2914 SCTP_SOCKET_LOCK(so, 1); 2915 SCTP_TCB_LOCK(stcb); 2916 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2917#endif 2918 if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) { 2919 soisconnected(stcb->sctp_socket); 2920 } 2921#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2922 SCTP_SOCKET_UNLOCK(so, 1); 2923#endif 2924 } 2925 /* 2926 * since we did not send a HB make sure we don't double 2927 * things 2928 */ 2929 net->hb_responded = 1; 2930 2931 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2932 /* 2933 * We don't need to do the asconf thing, nor hb or 2934 * autoclose if the socket is closed. 2935 */ 2936 goto closed_socket; 2937 } 2938 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 2939 stcb, net); 2940 2941 2942 if (stcb->asoc.sctp_autoclose_ticks && 2943 sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2944 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 2945 stcb->sctp_ep, stcb, NULL); 2946 } 2947 /* 2948 * send ASCONF if parameters are pending and ASCONFs are 2949 * allowed (eg. addresses changed when init/cookie echo were 2950 * in flight) 2951 */ 2952 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) && 2953 (stcb->asoc.asconf_supported == 1) && 2954 (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) { 2955#ifdef SCTP_TIMER_BASED_ASCONF 2956 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, 2957 stcb->sctp_ep, stcb, 2958 stcb->asoc.primary_destination); 2959#else 2960 sctp_send_asconf(stcb, stcb->asoc.primary_destination, 2961 SCTP_ADDR_NOT_LOCKED); 2962#endif 2963 } 2964 } 2965closed_socket: 2966 /* Toss the cookie if I can */ 2967 sctp_toss_old_cookies(stcb, asoc); 2968 if (!TAILQ_EMPTY(&asoc->sent_queue)) { 2969 /* Restart the timer if we have pending data */ 2970 struct sctp_tmit_chunk *chk; 2971 2972 chk = TAILQ_FIRST(&asoc->sent_queue); 2973 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 2974 } 2975} 2976 2977static void 2978sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp, 2979 struct sctp_tcb *stcb) 2980{ 2981 struct sctp_nets *net; 2982 struct sctp_tmit_chunk *lchk; 2983 struct sctp_ecne_chunk bkup; 2984 uint8_t override_bit; 2985 uint32_t tsn, window_data_tsn; 2986 int len; 2987 unsigned int pkt_cnt; 2988 2989 len = ntohs(cp->ch.chunk_length); 2990 if ((len != sizeof(struct sctp_ecne_chunk)) && 2991 (len != sizeof(struct old_sctp_ecne_chunk))) { 2992 return; 2993 } 2994 if (len == sizeof(struct old_sctp_ecne_chunk)) { 2995 /* Its the old format */ 2996 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk)); 2997 bkup.num_pkts_since_cwr = htonl(1); 2998 cp = &bkup; 2999 } 3000 SCTP_STAT_INCR(sctps_recvecne); 3001 tsn = ntohl(cp->tsn); 3002 pkt_cnt = ntohl(cp->num_pkts_since_cwr); 3003 lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead); 3004 if (lchk == NULL) { 3005 window_data_tsn = stcb->asoc.sending_seq - 1; 3006 } else { 3007 window_data_tsn = lchk->rec.data.TSN_seq; 3008 } 3009 3010 /* Find where it was sent to if possible. */ 3011 net = NULL; 3012 TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) { 3013 if (lchk->rec.data.TSN_seq == tsn) { 3014 net = lchk->whoTo; 3015 net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send; 3016 break; 3017 } 3018 if (SCTP_TSN_GT(lchk->rec.data.TSN_seq, tsn)) { 3019 break; 3020 } 3021 } 3022 if (net == NULL) { 3023 /* 3024 * What to do. A previous send of a CWR was possibly lost. 3025 * See how old it is, we may have it marked on the actual 3026 * net. 3027 */ 3028 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 3029 if (tsn == net->last_cwr_tsn) { 3030 /* Found him, send it off */ 3031 break; 3032 } 3033 } 3034 if (net == NULL) { 3035 /* 3036 * If we reach here, we need to send a special CWR 3037 * that says hey, we did this a long time ago and 3038 * you lost the response. 3039 */ 3040 net = TAILQ_FIRST(&stcb->asoc.nets); 3041 if (net == NULL) { 3042 /* TSNH */ 3043 return; 3044 } 3045 override_bit = SCTP_CWR_REDUCE_OVERRIDE; 3046 } else { 3047 override_bit = 0; 3048 } 3049 } else { 3050 override_bit = 0; 3051 } 3052 if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) && 3053 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 3054 /* 3055 * JRS - Use the congestion control given in the pluggable 3056 * CC module 3057 */ 3058 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt); 3059 /* 3060 * We reduce once every RTT. So we will only lower cwnd at 3061 * the next sending seq i.e. the window_data_tsn 3062 */ 3063 net->cwr_window_tsn = window_data_tsn; 3064 net->ecn_ce_pkt_cnt += pkt_cnt; 3065 net->lost_cnt = pkt_cnt; 3066 net->last_cwr_tsn = tsn; 3067 } else { 3068 override_bit |= SCTP_CWR_IN_SAME_WINDOW; 3069 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) && 3070 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 3071 /* 3072 * Another loss in the same window update how many 3073 * marks/packets lost we have had. 3074 */ 3075 int cnt = 1; 3076 3077 if (pkt_cnt > net->lost_cnt) { 3078 /* Should be the case */ 3079 cnt = (pkt_cnt - net->lost_cnt); 3080 net->ecn_ce_pkt_cnt += cnt; 3081 } 3082 net->lost_cnt = pkt_cnt; 3083 net->last_cwr_tsn = tsn; 3084 /* 3085 * Most CC functions will ignore this call, since we 3086 * are in-window yet of the initial CE the peer saw. 3087 */ 3088 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt); 3089 } 3090 } 3091 /* 3092 * We always send a CWR this way if our previous one was lost our 3093 * peer will get an update, or if it is not time again to reduce we 3094 * still get the cwr to the peer. Note we set the override when we 3095 * could not find the TSN on the chunk or the destination network. 3096 */ 3097 sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit); 3098} 3099 3100static void 3101sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net) 3102{ 3103 /* 3104 * Here we get a CWR from the peer. We must look in the outqueue and 3105 * make sure that we have a covered ECNE in the control chunk part. 3106 * If so remove it. 3107 */ 3108 struct sctp_tmit_chunk *chk; 3109 struct sctp_ecne_chunk *ecne; 3110 int override; 3111 uint32_t cwr_tsn; 3112 3113 cwr_tsn = ntohl(cp->tsn); 3114 3115 override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE; 3116 TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) { 3117 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) { 3118 continue; 3119 } 3120 if ((override == 0) && (chk->whoTo != net)) { 3121 /* Must be from the right src unless override is set */ 3122 continue; 3123 } 3124 ecne = mtod(chk->data, struct sctp_ecne_chunk *); 3125 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) { 3126 /* this covers this ECNE, we can remove it */ 3127 stcb->asoc.ecn_echo_cnt_onq--; 3128 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, 3129 sctp_next); 3130 if (chk->data) { 3131 sctp_m_freem(chk->data); 3132 chk->data = NULL; 3133 } 3134 stcb->asoc.ctrl_queue_cnt--; 3135 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3136 if (override == 0) { 3137 break; 3138 } 3139 } 3140 } 3141} 3142 3143static void 3144sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED, 3145 struct sctp_tcb *stcb, struct sctp_nets *net) 3146{ 3147 struct sctp_association *asoc; 3148 3149#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3150 struct socket *so; 3151 3152#endif 3153 3154 SCTPDBG(SCTP_DEBUG_INPUT2, 3155 "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n"); 3156 if (stcb == NULL) 3157 return; 3158 3159 asoc = &stcb->asoc; 3160 /* process according to association state */ 3161 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 3162 /* unexpected SHUTDOWN-COMPLETE... so ignore... */ 3163 SCTPDBG(SCTP_DEBUG_INPUT2, 3164 "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n"); 3165 SCTP_TCB_UNLOCK(stcb); 3166 return; 3167 } 3168 /* notify upper layer protocol */ 3169 if (stcb->sctp_socket) { 3170 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 3171 } 3172#ifdef INVARIANTS 3173 if (!TAILQ_EMPTY(&asoc->send_queue) || 3174 !TAILQ_EMPTY(&asoc->sent_queue) || 3175 !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 3176 panic("Queues are not empty when handling SHUTDOWN-COMPLETE"); 3177 } 3178#endif 3179 /* stop the timer */ 3180 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_22); 3181 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 3182 /* free the TCB */ 3183 SCTPDBG(SCTP_DEBUG_INPUT2, 3184 "sctp_handle_shutdown_complete: calls free-asoc\n"); 3185#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3186 so = SCTP_INP_SO(stcb->sctp_ep); 3187 atomic_add_int(&stcb->asoc.refcnt, 1); 3188 SCTP_TCB_UNLOCK(stcb); 3189 SCTP_SOCKET_LOCK(so, 1); 3190 SCTP_TCB_LOCK(stcb); 3191 atomic_subtract_int(&stcb->asoc.refcnt, 1); 3192#endif 3193 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_23); 3194#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3195 SCTP_SOCKET_UNLOCK(so, 1); 3196#endif 3197 return; 3198} 3199 3200static int 3201process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc, 3202 struct sctp_nets *net, uint8_t flg) 3203{ 3204 switch (desc->chunk_type) { 3205 case SCTP_DATA: 3206 /* find the tsn to resend (possibly */ 3207 { 3208 uint32_t tsn; 3209 struct sctp_tmit_chunk *tp1; 3210 3211 tsn = ntohl(desc->tsn_ifany); 3212 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3213 if (tp1->rec.data.TSN_seq == tsn) { 3214 /* found it */ 3215 break; 3216 } 3217 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, tsn)) { 3218 /* not found */ 3219 tp1 = NULL; 3220 break; 3221 } 3222 } 3223 if (tp1 == NULL) { 3224 /* 3225 * Do it the other way , aka without paying 3226 * attention to queue seq order. 3227 */ 3228 SCTP_STAT_INCR(sctps_pdrpdnfnd); 3229 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3230 if (tp1->rec.data.TSN_seq == tsn) { 3231 /* found it */ 3232 break; 3233 } 3234 } 3235 } 3236 if (tp1 == NULL) { 3237 SCTP_STAT_INCR(sctps_pdrptsnnf); 3238 } 3239 if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) { 3240 uint8_t *ddp; 3241 3242 if (((flg & SCTP_BADCRC) == 0) && 3243 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3244 return (0); 3245 } 3246 if ((stcb->asoc.peers_rwnd == 0) && 3247 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3248 SCTP_STAT_INCR(sctps_pdrpdiwnp); 3249 return (0); 3250 } 3251 if (stcb->asoc.peers_rwnd == 0 && 3252 (flg & SCTP_FROM_MIDDLE_BOX)) { 3253 SCTP_STAT_INCR(sctps_pdrpdizrw); 3254 return (0); 3255 } 3256 ddp = (uint8_t *) (mtod(tp1->data, caddr_t)+ 3257 sizeof(struct sctp_data_chunk)); 3258 { 3259 unsigned int iii; 3260 3261 for (iii = 0; iii < sizeof(desc->data_bytes); 3262 iii++) { 3263 if (ddp[iii] != desc->data_bytes[iii]) { 3264 SCTP_STAT_INCR(sctps_pdrpbadd); 3265 return (-1); 3266 } 3267 } 3268 } 3269 3270 if (tp1->do_rtt) { 3271 /* 3272 * this guy had a RTO calculation 3273 * pending on it, cancel it 3274 */ 3275 if (tp1->whoTo->rto_needed == 0) { 3276 tp1->whoTo->rto_needed = 1; 3277 } 3278 tp1->do_rtt = 0; 3279 } 3280 SCTP_STAT_INCR(sctps_pdrpmark); 3281 if (tp1->sent != SCTP_DATAGRAM_RESEND) 3282 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3283 /* 3284 * mark it as if we were doing a FR, since 3285 * we will be getting gap ack reports behind 3286 * the info from the router. 3287 */ 3288 tp1->rec.data.doing_fast_retransmit = 1; 3289 /* 3290 * mark the tsn with what sequences can 3291 * cause a new FR. 3292 */ 3293 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) { 3294 tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq; 3295 } else { 3296 tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq; 3297 } 3298 3299 /* restart the timer */ 3300 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3301 stcb, tp1->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_24); 3302 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3303 stcb, tp1->whoTo); 3304 3305 /* fix counts and things */ 3306 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 3307 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP, 3308 tp1->whoTo->flight_size, 3309 tp1->book_size, 3310 (uintptr_t) stcb, 3311 tp1->rec.data.TSN_seq); 3312 } 3313 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3314 sctp_flight_size_decrease(tp1); 3315 sctp_total_flight_decrease(stcb, tp1); 3316 } 3317 tp1->sent = SCTP_DATAGRAM_RESEND; 3318 } { 3319 /* audit code */ 3320 unsigned int audit; 3321 3322 audit = 0; 3323 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3324 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3325 audit++; 3326 } 3327 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue, 3328 sctp_next) { 3329 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3330 audit++; 3331 } 3332 if (audit != stcb->asoc.sent_queue_retran_cnt) { 3333 SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n", 3334 audit, stcb->asoc.sent_queue_retran_cnt); 3335#ifndef SCTP_AUDITING_ENABLED 3336 stcb->asoc.sent_queue_retran_cnt = audit; 3337#endif 3338 } 3339 } 3340 } 3341 break; 3342 case SCTP_ASCONF: 3343 { 3344 struct sctp_tmit_chunk *asconf; 3345 3346 TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue, 3347 sctp_next) { 3348 if (asconf->rec.chunk_id.id == SCTP_ASCONF) { 3349 break; 3350 } 3351 } 3352 if (asconf) { 3353 if (asconf->sent != SCTP_DATAGRAM_RESEND) 3354 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3355 asconf->sent = SCTP_DATAGRAM_RESEND; 3356 asconf->snd_count--; 3357 } 3358 } 3359 break; 3360 case SCTP_INITIATION: 3361 /* resend the INIT */ 3362 stcb->asoc.dropped_special_cnt++; 3363 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) { 3364 /* 3365 * If we can get it in, in a few attempts we do 3366 * this, otherwise we let the timer fire. 3367 */ 3368 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, 3369 stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_25); 3370 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 3371 } 3372 break; 3373 case SCTP_SELECTIVE_ACK: 3374 case SCTP_NR_SELECTIVE_ACK: 3375 /* resend the sack */ 3376 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED); 3377 break; 3378 case SCTP_HEARTBEAT_REQUEST: 3379 /* resend a demand HB */ 3380 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) { 3381 /* 3382 * Only retransmit if we KNOW we wont destroy the 3383 * tcb 3384 */ 3385 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 3386 } 3387 break; 3388 case SCTP_SHUTDOWN: 3389 sctp_send_shutdown(stcb, net); 3390 break; 3391 case SCTP_SHUTDOWN_ACK: 3392 sctp_send_shutdown_ack(stcb, net); 3393 break; 3394 case SCTP_COOKIE_ECHO: 3395 { 3396 struct sctp_tmit_chunk *cookie; 3397 3398 cookie = NULL; 3399 TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, 3400 sctp_next) { 3401 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) { 3402 break; 3403 } 3404 } 3405 if (cookie) { 3406 if (cookie->sent != SCTP_DATAGRAM_RESEND) 3407 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3408 cookie->sent = SCTP_DATAGRAM_RESEND; 3409 sctp_stop_all_cookie_timers(stcb); 3410 } 3411 } 3412 break; 3413 case SCTP_COOKIE_ACK: 3414 sctp_send_cookie_ack(stcb); 3415 break; 3416 case SCTP_ASCONF_ACK: 3417 /* resend last asconf ack */ 3418 sctp_send_asconf_ack(stcb); 3419 break; 3420 case SCTP_FORWARD_CUM_TSN: 3421 send_forward_tsn(stcb, &stcb->asoc); 3422 break; 3423 /* can't do anything with these */ 3424 case SCTP_PACKET_DROPPED: 3425 case SCTP_INITIATION_ACK: /* this should not happen */ 3426 case SCTP_HEARTBEAT_ACK: 3427 case SCTP_ABORT_ASSOCIATION: 3428 case SCTP_OPERATION_ERROR: 3429 case SCTP_SHUTDOWN_COMPLETE: 3430 case SCTP_ECN_ECHO: 3431 case SCTP_ECN_CWR: 3432 default: 3433 break; 3434 } 3435 return (0); 3436} 3437 3438void 3439sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list) 3440{ 3441 uint32_t i; 3442 uint16_t temp; 3443 3444 /* 3445 * We set things to 0xffff since this is the last delivered sequence 3446 * and we will be sending in 0 after the reset. 3447 */ 3448 3449 if (number_entries) { 3450 for (i = 0; i < number_entries; i++) { 3451 temp = ntohs(list[i]); 3452 if (temp >= stcb->asoc.streamincnt) { 3453 continue; 3454 } 3455 stcb->asoc.strmin[temp].last_sequence_delivered = 0xffff; 3456 } 3457 } else { 3458 list = NULL; 3459 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3460 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff; 3461 } 3462 } 3463 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3464} 3465 3466static void 3467sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list) 3468{ 3469 uint32_t i; 3470 uint16_t temp; 3471 3472 if (number_entries > 0) { 3473 for (i = 0; i < number_entries; i++) { 3474 temp = ntohs(list[i]); 3475 if (temp >= stcb->asoc.streamoutcnt) { 3476 /* no such stream */ 3477 continue; 3478 } 3479 stcb->asoc.strmout[temp].next_sequence_send = 0; 3480 } 3481 } else { 3482 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3483 stcb->asoc.strmout[i].next_sequence_send = 0; 3484 } 3485 } 3486 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3487} 3488 3489 3490struct sctp_stream_reset_request * 3491sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk) 3492{ 3493 struct sctp_association *asoc; 3494 struct sctp_chunkhdr *ch; 3495 struct sctp_stream_reset_request *r; 3496 struct sctp_tmit_chunk *chk; 3497 int len, clen; 3498 3499 asoc = &stcb->asoc; 3500 if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 3501 asoc->stream_reset_outstanding = 0; 3502 return (NULL); 3503 } 3504 if (stcb->asoc.str_reset == NULL) { 3505 asoc->stream_reset_outstanding = 0; 3506 return (NULL); 3507 } 3508 chk = stcb->asoc.str_reset; 3509 if (chk->data == NULL) { 3510 return (NULL); 3511 } 3512 if (bchk) { 3513 /* he wants a copy of the chk pointer */ 3514 *bchk = chk; 3515 } 3516 clen = chk->send_size; 3517 ch = mtod(chk->data, struct sctp_chunkhdr *); 3518 r = (struct sctp_stream_reset_request *)(ch + 1); 3519 if (ntohl(r->request_seq) == seq) { 3520 /* found it */ 3521 return (r); 3522 } 3523 len = SCTP_SIZE32(ntohs(r->ph.param_length)); 3524 if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) { 3525 /* move to the next one, there can only be a max of two */ 3526 r = (struct sctp_stream_reset_request *)((caddr_t)r + len); 3527 if (ntohl(r->request_seq) == seq) { 3528 return (r); 3529 } 3530 } 3531 /* that seq is not here */ 3532 return (NULL); 3533} 3534 3535static void 3536sctp_clean_up_stream_reset(struct sctp_tcb *stcb) 3537{ 3538 struct sctp_association *asoc; 3539 struct sctp_tmit_chunk *chk = stcb->asoc.str_reset; 3540 3541 if (stcb->asoc.str_reset == NULL) { 3542 return; 3543 } 3544 asoc = &stcb->asoc; 3545 3546 sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_26); 3547 TAILQ_REMOVE(&asoc->control_send_queue, 3548 chk, 3549 sctp_next); 3550 if (chk->data) { 3551 sctp_m_freem(chk->data); 3552 chk->data = NULL; 3553 } 3554 asoc->ctrl_queue_cnt--; 3555 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3556 /* sa_ignore NO_NULL_CHK */ 3557 stcb->asoc.str_reset = NULL; 3558} 3559 3560 3561static int 3562sctp_handle_stream_reset_response(struct sctp_tcb *stcb, 3563 uint32_t seq, uint32_t action, 3564 struct sctp_stream_reset_response *respin) 3565{ 3566 uint16_t type; 3567 int lparm_len; 3568 struct sctp_association *asoc = &stcb->asoc; 3569 struct sctp_tmit_chunk *chk; 3570 struct sctp_stream_reset_request *req_param; 3571 struct sctp_stream_reset_out_request *req_out_param; 3572 struct sctp_stream_reset_in_request *req_in_param; 3573 uint32_t number_entries; 3574 3575 if (asoc->stream_reset_outstanding == 0) { 3576 /* duplicate */ 3577 return (0); 3578 } 3579 if (seq == stcb->asoc.str_reset_seq_out) { 3580 req_param = sctp_find_stream_reset(stcb, seq, &chk); 3581 if (req_param != NULL) { 3582 stcb->asoc.str_reset_seq_out++; 3583 type = ntohs(req_param->ph.param_type); 3584 lparm_len = ntohs(req_param->ph.param_length); 3585 if (type == SCTP_STR_RESET_OUT_REQUEST) { 3586 req_out_param = (struct sctp_stream_reset_out_request *)req_param; 3587 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t); 3588 asoc->stream_reset_out_is_outstanding = 0; 3589 if (asoc->stream_reset_outstanding) 3590 asoc->stream_reset_outstanding--; 3591 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3592 /* do it */ 3593 sctp_reset_out_streams(stcb, number_entries, req_out_param->list_of_streams); 3594 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3595 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3596 } else { 3597 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3598 } 3599 } else if (type == SCTP_STR_RESET_IN_REQUEST) { 3600 req_in_param = (struct sctp_stream_reset_in_request *)req_param; 3601 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t); 3602 if (asoc->stream_reset_outstanding) 3603 asoc->stream_reset_outstanding--; 3604 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3605 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb, 3606 number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3607 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3608 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb, 3609 number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3610 } 3611 } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) { 3612 /* Ok we now may have more streams */ 3613 int num_stream; 3614 3615 num_stream = stcb->asoc.strm_pending_add_size; 3616 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) { 3617 /* TSNH */ 3618 num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt; 3619 } 3620 stcb->asoc.strm_pending_add_size = 0; 3621 if (asoc->stream_reset_outstanding) 3622 asoc->stream_reset_outstanding--; 3623 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3624 /* Put the new streams into effect */ 3625 stcb->asoc.streamoutcnt += num_stream; 3626 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 3627 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3628 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3629 SCTP_STREAM_CHANGE_DENIED); 3630 } else { 3631 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3632 SCTP_STREAM_CHANGE_FAILED); 3633 } 3634 } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) { 3635 if (asoc->stream_reset_outstanding) 3636 asoc->stream_reset_outstanding--; 3637 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3638 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3639 SCTP_STREAM_CHANGE_DENIED); 3640 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3641 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3642 SCTP_STREAM_CHANGE_FAILED); 3643 } 3644 } else if (type == SCTP_STR_RESET_TSN_REQUEST) { 3645 /** 3646 * a) Adopt the new in tsn. 3647 * b) reset the map 3648 * c) Adopt the new out-tsn 3649 */ 3650 struct sctp_stream_reset_response_tsn *resp; 3651 struct sctp_forward_tsn_chunk fwdtsn; 3652 int abort_flag = 0; 3653 3654 if (respin == NULL) { 3655 /* huh ? */ 3656 return (0); 3657 } 3658 if (ntohs(respin->ph.param_length) < sizeof(struct sctp_stream_reset_response_tsn)) { 3659 return (0); 3660 } 3661 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3662 resp = (struct sctp_stream_reset_response_tsn *)respin; 3663 asoc->stream_reset_outstanding--; 3664 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3665 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3666 fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1); 3667 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3668 if (abort_flag) { 3669 return (1); 3670 } 3671 stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1); 3672 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3673 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3674 } 3675 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 3676 stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn); 3677 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 3678 3679 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map; 3680 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size); 3681 3682 stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn); 3683 stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn; 3684 3685 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL); 3686 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL); 3687 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0); 3688 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3689 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3690 SCTP_ASSOC_RESET_DENIED); 3691 } else { 3692 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3693 SCTP_ASSOC_RESET_FAILED); 3694 } 3695 } 3696 /* get rid of the request and get the request flags */ 3697 if (asoc->stream_reset_outstanding == 0) { 3698 sctp_clean_up_stream_reset(stcb); 3699 } 3700 } 3701 } 3702 return (0); 3703} 3704 3705static void 3706sctp_handle_str_reset_request_in(struct sctp_tcb *stcb, 3707 struct sctp_tmit_chunk *chk, 3708 struct sctp_stream_reset_in_request *req, int trunc) 3709{ 3710 uint32_t seq; 3711 int len, i; 3712 int number_entries; 3713 uint16_t temp; 3714 3715 /* 3716 * peer wants me to send a str-reset to him for my outgoing seq's if 3717 * seq_in is right. 3718 */ 3719 struct sctp_association *asoc = &stcb->asoc; 3720 3721 seq = ntohl(req->request_seq); 3722 if (asoc->str_reset_seq_in == seq) { 3723 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3724 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3725 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3726 } else if (trunc) { 3727 /* Can't do it, since they exceeded our buffer size */ 3728 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3729 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) { 3730 len = ntohs(req->ph.param_length); 3731 number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t)); 3732 for (i = 0; i < number_entries; i++) { 3733 temp = ntohs(req->list_of_streams[i]); 3734 req->list_of_streams[i] = temp; 3735 } 3736 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3737 sctp_add_stream_reset_out(chk, number_entries, req->list_of_streams, 3738 asoc->str_reset_seq_out, 3739 seq, (asoc->sending_seq - 1)); 3740 asoc->stream_reset_out_is_outstanding = 1; 3741 asoc->str_reset = chk; 3742 sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo); 3743 stcb->asoc.stream_reset_outstanding++; 3744 } else { 3745 /* Can't do it, since we have sent one out */ 3746 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 3747 } 3748 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3749 asoc->str_reset_seq_in++; 3750 } else if (asoc->str_reset_seq_in - 1 == seq) { 3751 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3752 } else if (asoc->str_reset_seq_in - 2 == seq) { 3753 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3754 } else { 3755 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3756 } 3757} 3758 3759static int 3760sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb, 3761 struct sctp_tmit_chunk *chk, 3762 struct sctp_stream_reset_tsn_request *req) 3763{ 3764 /* reset all in and out and update the tsn */ 3765 /* 3766 * A) reset my str-seq's on in and out. B) Select a receive next, 3767 * and set cum-ack to it. Also process this selected number as a 3768 * fwd-tsn as well. C) set in the response my next sending seq. 3769 */ 3770 struct sctp_forward_tsn_chunk fwdtsn; 3771 struct sctp_association *asoc = &stcb->asoc; 3772 int abort_flag = 0; 3773 uint32_t seq; 3774 3775 seq = ntohl(req->request_seq); 3776 if (asoc->str_reset_seq_in == seq) { 3777 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3778 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 3779 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3780 } else { 3781 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3782 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3783 fwdtsn.ch.chunk_flags = 0; 3784 fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1); 3785 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3786 if (abort_flag) { 3787 return (1); 3788 } 3789 asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA; 3790 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3791 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3792 } 3793 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map; 3794 asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1; 3795 memset(asoc->mapping_array, 0, asoc->mapping_array_size); 3796 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 3797 memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size); 3798 atomic_add_int(&asoc->sending_seq, 1); 3799 /* save off historical data for retrans */ 3800 asoc->last_sending_seq[1] = asoc->last_sending_seq[0]; 3801 asoc->last_sending_seq[0] = asoc->sending_seq; 3802 asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0]; 3803 asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn; 3804 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL); 3805 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL); 3806 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3807 sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0); 3808 } 3809 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3810 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3811 asoc->str_reset_seq_in++; 3812 } else if (asoc->str_reset_seq_in - 1 == seq) { 3813 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3814 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3815 } else if (asoc->str_reset_seq_in - 2 == seq) { 3816 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1], 3817 asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]); 3818 } else { 3819 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3820 } 3821 return (0); 3822} 3823 3824static void 3825sctp_handle_str_reset_request_out(struct sctp_tcb *stcb, 3826 struct sctp_tmit_chunk *chk, 3827 struct sctp_stream_reset_out_request *req, int trunc) 3828{ 3829 uint32_t seq, tsn; 3830 int number_entries, len; 3831 struct sctp_association *asoc = &stcb->asoc; 3832 3833 seq = ntohl(req->request_seq); 3834 3835 /* now if its not a duplicate we process it */ 3836 if (asoc->str_reset_seq_in == seq) { 3837 len = ntohs(req->ph.param_length); 3838 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t)); 3839 /* 3840 * the sender is resetting, handle the list issue.. we must 3841 * a) verify if we can do the reset, if so no problem b) If 3842 * we can't do the reset we must copy the request. c) queue 3843 * it, and setup the data in processor to trigger it off 3844 * when needed and dequeue all the queued data. 3845 */ 3846 tsn = ntohl(req->send_reset_at_tsn); 3847 3848 /* move the reset action back one */ 3849 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3850 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3851 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3852 } else if (trunc) { 3853 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3854 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) { 3855 /* we can do it now */ 3856 sctp_reset_in_stream(stcb, number_entries, req->list_of_streams); 3857 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3858 } else { 3859 /* 3860 * we must queue it up and thus wait for the TSN's 3861 * to arrive that are at or before tsn 3862 */ 3863 struct sctp_stream_reset_list *liste; 3864 int siz; 3865 3866 siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t)); 3867 SCTP_MALLOC(liste, struct sctp_stream_reset_list *, 3868 siz, SCTP_M_STRESET); 3869 if (liste == NULL) { 3870 /* gak out of memory */ 3871 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3872 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3873 return; 3874 } 3875 liste->tsn = tsn; 3876 liste->number_entries = number_entries; 3877 memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t)); 3878 TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp); 3879 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3880 } 3881 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3882 asoc->str_reset_seq_in++; 3883 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3884 /* 3885 * one seq back, just echo back last action since my 3886 * response was lost. 3887 */ 3888 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3889 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3890 /* 3891 * two seq back, just echo back last action since my 3892 * response was lost. 3893 */ 3894 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3895 } else { 3896 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3897 } 3898} 3899 3900static void 3901sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 3902 struct sctp_stream_reset_add_strm *str_add) 3903{ 3904 /* 3905 * Peer is requesting to add more streams. If its within our 3906 * max-streams we will allow it. 3907 */ 3908 uint32_t num_stream, i; 3909 uint32_t seq; 3910 struct sctp_association *asoc = &stcb->asoc; 3911 struct sctp_queued_to_read *ctl, *nctl; 3912 3913 /* Get the number. */ 3914 seq = ntohl(str_add->request_seq); 3915 num_stream = ntohs(str_add->number_of_streams); 3916 /* Now what would be the new total? */ 3917 if (asoc->str_reset_seq_in == seq) { 3918 num_stream += stcb->asoc.streamincnt; 3919 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3920 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 3921 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3922 } else if ((num_stream > stcb->asoc.max_inbound_streams) || 3923 (num_stream > 0xffff)) { 3924 /* We must reject it they ask for to many */ 3925 denied: 3926 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3927 } else { 3928 /* Ok, we can do that :-) */ 3929 struct sctp_stream_in *oldstrm; 3930 3931 /* save off the old */ 3932 oldstrm = stcb->asoc.strmin; 3933 SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *, 3934 (num_stream * sizeof(struct sctp_stream_in)), 3935 SCTP_M_STRMI); 3936 if (stcb->asoc.strmin == NULL) { 3937 stcb->asoc.strmin = oldstrm; 3938 goto denied; 3939 } 3940 /* copy off the old data */ 3941 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3942 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 3943 stcb->asoc.strmin[i].stream_no = i; 3944 stcb->asoc.strmin[i].last_sequence_delivered = oldstrm[i].last_sequence_delivered; 3945 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started; 3946 /* now anything on those queues? */ 3947 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next, nctl) { 3948 TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next); 3949 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next); 3950 } 3951 } 3952 /* Init the new streams */ 3953 for (i = stcb->asoc.streamincnt; i < num_stream; i++) { 3954 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 3955 stcb->asoc.strmin[i].stream_no = i; 3956 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff; 3957 stcb->asoc.strmin[i].delivery_started = 0; 3958 } 3959 SCTP_FREE(oldstrm, SCTP_M_STRMI); 3960 /* update the size */ 3961 stcb->asoc.streamincnt = num_stream; 3962 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3963 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 3964 } 3965 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3966 asoc->str_reset_seq_in++; 3967 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3968 /* 3969 * one seq back, just echo back last action since my 3970 * response was lost. 3971 */ 3972 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3973 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3974 /* 3975 * two seq back, just echo back last action since my 3976 * response was lost. 3977 */ 3978 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3979 } else { 3980 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3981 3982 } 3983} 3984 3985static void 3986sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 3987 struct sctp_stream_reset_add_strm *str_add) 3988{ 3989 /* 3990 * Peer is requesting to add more streams. If its within our 3991 * max-streams we will allow it. 3992 */ 3993 uint16_t num_stream; 3994 uint32_t seq; 3995 struct sctp_association *asoc = &stcb->asoc; 3996 3997 /* Get the number. */ 3998 seq = ntohl(str_add->request_seq); 3999 num_stream = ntohs(str_add->number_of_streams); 4000 /* Now what would be the new total? */ 4001 if (asoc->str_reset_seq_in == seq) { 4002 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 4003 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 4004 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4005 } else if (stcb->asoc.stream_reset_outstanding) { 4006 /* We must reject it we have something pending */ 4007 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 4008 } else { 4009 /* Ok, we can do that :-) */ 4010 int mychk; 4011 4012 mychk = stcb->asoc.streamoutcnt; 4013 mychk += num_stream; 4014 if (mychk < 0x10000) { 4015 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 4016 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 0, 1, num_stream, 0, 1)) { 4017 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4018 } 4019 } else { 4020 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4021 } 4022 } 4023 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]); 4024 asoc->str_reset_seq_in++; 4025 } else if ((asoc->str_reset_seq_in - 1) == seq) { 4026 /* 4027 * one seq back, just echo back last action since my 4028 * response was lost. 4029 */ 4030 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4031 } else if ((asoc->str_reset_seq_in - 2) == seq) { 4032 /* 4033 * two seq back, just echo back last action since my 4034 * response was lost. 4035 */ 4036 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 4037 } else { 4038 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 4039 } 4040} 4041 4042#ifdef __GNUC__ 4043__attribute__((noinline)) 4044#endif 4045 static int 4046 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset, 4047 struct sctp_chunkhdr *ch_req) 4048{ 4049 uint16_t remaining_length, param_len, ptype; 4050 struct sctp_paramhdr pstore; 4051 uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE]; 4052 uint32_t seq = 0; 4053 int num_req = 0; 4054 int trunc = 0; 4055 struct sctp_tmit_chunk *chk; 4056 struct sctp_chunkhdr *ch; 4057 struct sctp_paramhdr *ph; 4058 int ret_code = 0; 4059 int num_param = 0; 4060 4061 /* now it may be a reset or a reset-response */ 4062 remaining_length = ntohs(ch_req->chunk_length) - sizeof(struct sctp_chunkhdr); 4063 4064 /* setup for adding the response */ 4065 sctp_alloc_a_chunk(stcb, chk); 4066 if (chk == NULL) { 4067 return (ret_code); 4068 } 4069 chk->copy_by_ref = 0; 4070 chk->rec.chunk_id.id = SCTP_STREAM_RESET; 4071 chk->rec.chunk_id.can_take_data = 0; 4072 chk->flags = 0; 4073 chk->asoc = &stcb->asoc; 4074 chk->no_fr_allowed = 0; 4075 chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr); 4076 chk->book_size_scale = 0; 4077 chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA); 4078 if (chk->data == NULL) { 4079strres_nochunk: 4080 if (chk->data) { 4081 sctp_m_freem(chk->data); 4082 chk->data = NULL; 4083 } 4084 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 4085 return (ret_code); 4086 } 4087 SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD); 4088 4089 /* setup chunk parameters */ 4090 chk->sent = SCTP_DATAGRAM_UNSENT; 4091 chk->snd_count = 0; 4092 chk->whoTo = NULL; 4093 4094 ch = mtod(chk->data, struct sctp_chunkhdr *); 4095 ch->chunk_type = SCTP_STREAM_RESET; 4096 ch->chunk_flags = 0; 4097 ch->chunk_length = htons(chk->send_size); 4098 SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size); 4099 offset += sizeof(struct sctp_chunkhdr); 4100 while (remaining_length >= sizeof(struct sctp_paramhdr)) { 4101 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *) & pstore); 4102 if (ph == NULL) { 4103 /* TSNH */ 4104 break; 4105 } 4106 param_len = ntohs(ph->param_length); 4107 if ((param_len > remaining_length) || 4108 (param_len < (sizeof(struct sctp_paramhdr) + sizeof(uint32_t)))) { 4109 /* bad parameter length */ 4110 break; 4111 } 4112 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, sizeof(cstore)), 4113 (uint8_t *) & cstore); 4114 if (ph == NULL) { 4115 /* TSNH */ 4116 break; 4117 } 4118 ptype = ntohs(ph->param_type); 4119 num_param++; 4120 if (param_len > sizeof(cstore)) { 4121 trunc = 1; 4122 } else { 4123 trunc = 0; 4124 } 4125 if (num_param > SCTP_MAX_RESET_PARAMS) { 4126 /* hit the max of parameters already sorry.. */ 4127 break; 4128 } 4129 if (ptype == SCTP_STR_RESET_OUT_REQUEST) { 4130 struct sctp_stream_reset_out_request *req_out; 4131 4132 if (param_len < sizeof(struct sctp_stream_reset_out_request)) { 4133 break; 4134 } 4135 req_out = (struct sctp_stream_reset_out_request *)ph; 4136 num_req++; 4137 if (stcb->asoc.stream_reset_outstanding) { 4138 seq = ntohl(req_out->response_seq); 4139 if (seq == stcb->asoc.str_reset_seq_out) { 4140 /* implicit ack */ 4141 (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL); 4142 } 4143 } 4144 sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc); 4145 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) { 4146 struct sctp_stream_reset_add_strm *str_add; 4147 4148 if (param_len < sizeof(struct sctp_stream_reset_add_strm)) { 4149 break; 4150 } 4151 str_add = (struct sctp_stream_reset_add_strm *)ph; 4152 num_req++; 4153 sctp_handle_str_reset_add_strm(stcb, chk, str_add); 4154 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) { 4155 struct sctp_stream_reset_add_strm *str_add; 4156 4157 if (param_len < sizeof(struct sctp_stream_reset_add_strm)) { 4158 break; 4159 } 4160 str_add = (struct sctp_stream_reset_add_strm *)ph; 4161 num_req++; 4162 sctp_handle_str_reset_add_out_strm(stcb, chk, str_add); 4163 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) { 4164 struct sctp_stream_reset_in_request *req_in; 4165 4166 num_req++; 4167 req_in = (struct sctp_stream_reset_in_request *)ph; 4168 sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc); 4169 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) { 4170 struct sctp_stream_reset_tsn_request *req_tsn; 4171 4172 num_req++; 4173 req_tsn = (struct sctp_stream_reset_tsn_request *)ph; 4174 if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) { 4175 ret_code = 1; 4176 goto strres_nochunk; 4177 } 4178 /* no more */ 4179 break; 4180 } else if (ptype == SCTP_STR_RESET_RESPONSE) { 4181 struct sctp_stream_reset_response *resp; 4182 uint32_t result; 4183 4184 if (param_len < sizeof(struct sctp_stream_reset_response)) { 4185 break; 4186 } 4187 resp = (struct sctp_stream_reset_response *)ph; 4188 seq = ntohl(resp->response_seq); 4189 result = ntohl(resp->result); 4190 if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) { 4191 ret_code = 1; 4192 goto strres_nochunk; 4193 } 4194 } else { 4195 break; 4196 } 4197 offset += SCTP_SIZE32(param_len); 4198 if (remaining_length >= SCTP_SIZE32(param_len)) { 4199 remaining_length -= SCTP_SIZE32(param_len); 4200 } else { 4201 remaining_length = 0; 4202 } 4203 } 4204 if (num_req == 0) { 4205 /* we have no response free the stuff */ 4206 goto strres_nochunk; 4207 } 4208 /* ok we have a chunk to link in */ 4209 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, 4210 chk, 4211 sctp_next); 4212 stcb->asoc.ctrl_queue_cnt++; 4213 return (ret_code); 4214} 4215 4216/* 4217 * Handle a router or endpoints report of a packet loss, there are two ways 4218 * to handle this, either we get the whole packet and must disect it 4219 * ourselves (possibly with truncation and or corruption) or it is a summary 4220 * from a middle box that did the disectting for us. 4221 */ 4222static void 4223sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp, 4224 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 4225{ 4226 uint32_t bottle_bw, on_queue; 4227 uint16_t trunc_len; 4228 unsigned int chlen; 4229 unsigned int at; 4230 struct sctp_chunk_desc desc; 4231 struct sctp_chunkhdr *ch; 4232 4233 chlen = ntohs(cp->ch.chunk_length); 4234 chlen -= sizeof(struct sctp_pktdrop_chunk); 4235 /* XXX possible chlen underflow */ 4236 if (chlen == 0) { 4237 ch = NULL; 4238 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) 4239 SCTP_STAT_INCR(sctps_pdrpbwrpt); 4240 } else { 4241 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr)); 4242 chlen -= sizeof(struct sctphdr); 4243 /* XXX possible chlen underflow */ 4244 memset(&desc, 0, sizeof(desc)); 4245 } 4246 trunc_len = (uint16_t) ntohs(cp->trunc_len); 4247 if (trunc_len > limit) { 4248 trunc_len = limit; 4249 } 4250 /* now the chunks themselves */ 4251 while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) { 4252 desc.chunk_type = ch->chunk_type; 4253 /* get amount we need to move */ 4254 at = ntohs(ch->chunk_length); 4255 if (at < sizeof(struct sctp_chunkhdr)) { 4256 /* corrupt chunk, maybe at the end? */ 4257 SCTP_STAT_INCR(sctps_pdrpcrupt); 4258 break; 4259 } 4260 if (trunc_len == 0) { 4261 /* we are supposed to have all of it */ 4262 if (at > chlen) { 4263 /* corrupt skip it */ 4264 SCTP_STAT_INCR(sctps_pdrpcrupt); 4265 break; 4266 } 4267 } else { 4268 /* is there enough of it left ? */ 4269 if (desc.chunk_type == SCTP_DATA) { 4270 if (chlen < (sizeof(struct sctp_data_chunk) + 4271 sizeof(desc.data_bytes))) { 4272 break; 4273 } 4274 } else { 4275 if (chlen < sizeof(struct sctp_chunkhdr)) { 4276 break; 4277 } 4278 } 4279 } 4280 if (desc.chunk_type == SCTP_DATA) { 4281 /* can we get out the tsn? */ 4282 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4283 SCTP_STAT_INCR(sctps_pdrpmbda); 4284 4285 if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) { 4286 /* yep */ 4287 struct sctp_data_chunk *dcp; 4288 uint8_t *ddp; 4289 unsigned int iii; 4290 4291 dcp = (struct sctp_data_chunk *)ch; 4292 ddp = (uint8_t *) (dcp + 1); 4293 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) { 4294 desc.data_bytes[iii] = ddp[iii]; 4295 } 4296 desc.tsn_ifany = dcp->dp.tsn; 4297 } else { 4298 /* nope we are done. */ 4299 SCTP_STAT_INCR(sctps_pdrpnedat); 4300 break; 4301 } 4302 } else { 4303 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4304 SCTP_STAT_INCR(sctps_pdrpmbct); 4305 } 4306 4307 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) { 4308 SCTP_STAT_INCR(sctps_pdrppdbrk); 4309 break; 4310 } 4311 if (SCTP_SIZE32(at) > chlen) { 4312 break; 4313 } 4314 chlen -= SCTP_SIZE32(at); 4315 if (chlen < sizeof(struct sctp_chunkhdr)) { 4316 /* done, none left */ 4317 break; 4318 } 4319 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at)); 4320 } 4321 /* Now update any rwnd --- possibly */ 4322 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) { 4323 /* From a peer, we get a rwnd report */ 4324 uint32_t a_rwnd; 4325 4326 SCTP_STAT_INCR(sctps_pdrpfehos); 4327 4328 bottle_bw = ntohl(cp->bottle_bw); 4329 on_queue = ntohl(cp->current_onq); 4330 if (bottle_bw && on_queue) { 4331 /* a rwnd report is in here */ 4332 if (bottle_bw > on_queue) 4333 a_rwnd = bottle_bw - on_queue; 4334 else 4335 a_rwnd = 0; 4336 4337 if (a_rwnd == 0) 4338 stcb->asoc.peers_rwnd = 0; 4339 else { 4340 if (a_rwnd > stcb->asoc.total_flight) { 4341 stcb->asoc.peers_rwnd = 4342 a_rwnd - stcb->asoc.total_flight; 4343 } else { 4344 stcb->asoc.peers_rwnd = 0; 4345 } 4346 if (stcb->asoc.peers_rwnd < 4347 stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 4348 /* SWS sender side engages */ 4349 stcb->asoc.peers_rwnd = 0; 4350 } 4351 } 4352 } 4353 } else { 4354 SCTP_STAT_INCR(sctps_pdrpfmbox); 4355 } 4356 4357 /* now middle boxes in sat networks get a cwnd bump */ 4358 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) && 4359 (stcb->asoc.sat_t3_loss_recovery == 0) && 4360 (stcb->asoc.sat_network)) { 4361 /* 4362 * This is debateable but for sat networks it makes sense 4363 * Note if a T3 timer has went off, we will prohibit any 4364 * changes to cwnd until we exit the t3 loss recovery. 4365 */ 4366 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb, 4367 net, cp, &bottle_bw, &on_queue); 4368 } 4369} 4370 4371/* 4372 * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to 4373 * still contain IP/SCTP header - stcb: is the tcb found for this packet - 4374 * offset: offset into the mbuf chain to first chunkhdr - length: is the 4375 * length of the complete packet outputs: - length: modified to remaining 4376 * length after control processing - netp: modified to new sctp_nets after 4377 * cookie-echo processing - return NULL to discard the packet (ie. no asoc, 4378 * bad packet,...) otherwise return the tcb for this packet 4379 */ 4380#ifdef __GNUC__ 4381__attribute__((noinline)) 4382#endif 4383 static struct sctp_tcb * 4384 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length, 4385 struct sockaddr *src, struct sockaddr *dst, 4386 struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp, 4387 struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen, 4388 uint8_t mflowtype, uint32_t mflowid, 4389 uint32_t vrf_id, uint16_t port) 4390{ 4391 struct sctp_association *asoc; 4392 struct mbuf *op_err; 4393 char msg[SCTP_DIAG_INFO_LEN]; 4394 uint32_t vtag_in; 4395 int num_chunks = 0; /* number of control chunks processed */ 4396 uint32_t chk_length; 4397 int ret; 4398 int abort_no_unlock = 0; 4399 int ecne_seen = 0; 4400 4401 /* 4402 * How big should this be, and should it be alloc'd? Lets try the 4403 * d-mtu-ceiling for now (2k) and that should hopefully work ... 4404 * until we get into jumbo grams and such.. 4405 */ 4406 uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE]; 4407 struct sctp_tcb *locked_tcb = stcb; 4408 int got_auth = 0; 4409 uint32_t auth_offset = 0, auth_len = 0; 4410 int auth_skipped = 0; 4411 int asconf_cnt = 0; 4412 4413#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4414 struct socket *so; 4415 4416#endif 4417 4418 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n", 4419 iphlen, *offset, length, (void *)stcb); 4420 4421 /* validate chunk header length... */ 4422 if (ntohs(ch->chunk_length) < sizeof(*ch)) { 4423 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n", 4424 ntohs(ch->chunk_length)); 4425 if (locked_tcb) { 4426 SCTP_TCB_UNLOCK(locked_tcb); 4427 } 4428 return (NULL); 4429 } 4430 /* 4431 * validate the verification tag 4432 */ 4433 vtag_in = ntohl(sh->v_tag); 4434 4435 if (locked_tcb) { 4436 SCTP_TCB_LOCK_ASSERT(locked_tcb); 4437 } 4438 if (ch->chunk_type == SCTP_INITIATION) { 4439 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n", 4440 ntohs(ch->chunk_length), vtag_in); 4441 if (vtag_in != 0) { 4442 /* protocol error- silently discard... */ 4443 SCTP_STAT_INCR(sctps_badvtag); 4444 if (locked_tcb) { 4445 SCTP_TCB_UNLOCK(locked_tcb); 4446 } 4447 return (NULL); 4448 } 4449 } else if (ch->chunk_type != SCTP_COOKIE_ECHO) { 4450 /* 4451 * If there is no stcb, skip the AUTH chunk and process 4452 * later after a stcb is found (to validate the lookup was 4453 * valid. 4454 */ 4455 if ((ch->chunk_type == SCTP_AUTHENTICATION) && 4456 (stcb == NULL) && 4457 (inp->auth_supported == 1)) { 4458 /* save this chunk for later processing */ 4459 auth_skipped = 1; 4460 auth_offset = *offset; 4461 auth_len = ntohs(ch->chunk_length); 4462 4463 /* (temporarily) move past this chunk */ 4464 *offset += SCTP_SIZE32(auth_len); 4465 if (*offset >= length) { 4466 /* no more data left in the mbuf chain */ 4467 *offset = length; 4468 if (locked_tcb) { 4469 SCTP_TCB_UNLOCK(locked_tcb); 4470 } 4471 return (NULL); 4472 } 4473 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4474 sizeof(struct sctp_chunkhdr), chunk_buf); 4475 } 4476 if (ch == NULL) { 4477 /* Help */ 4478 *offset = length; 4479 if (locked_tcb) { 4480 SCTP_TCB_UNLOCK(locked_tcb); 4481 } 4482 return (NULL); 4483 } 4484 if (ch->chunk_type == SCTP_COOKIE_ECHO) { 4485 goto process_control_chunks; 4486 } 4487 /* 4488 * first check if it's an ASCONF with an unknown src addr we 4489 * need to look inside to find the association 4490 */ 4491 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) { 4492 struct sctp_chunkhdr *asconf_ch = ch; 4493 uint32_t asconf_offset = 0, asconf_len = 0; 4494 4495 /* inp's refcount may be reduced */ 4496 SCTP_INP_INCR_REF(inp); 4497 4498 asconf_offset = *offset; 4499 do { 4500 asconf_len = ntohs(asconf_ch->chunk_length); 4501 if (asconf_len < sizeof(struct sctp_asconf_paramhdr)) 4502 break; 4503 stcb = sctp_findassociation_ep_asconf(m, 4504 *offset, 4505 dst, 4506 sh, &inp, netp, vrf_id); 4507 if (stcb != NULL) 4508 break; 4509 asconf_offset += SCTP_SIZE32(asconf_len); 4510 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset, 4511 sizeof(struct sctp_chunkhdr), chunk_buf); 4512 } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF); 4513 if (stcb == NULL) { 4514 /* 4515 * reduce inp's refcount if not reduced in 4516 * sctp_findassociation_ep_asconf(). 4517 */ 4518 SCTP_INP_DECR_REF(inp); 4519 } else { 4520 locked_tcb = stcb; 4521 } 4522 4523 /* now go back and verify any auth chunk to be sure */ 4524 if (auth_skipped && (stcb != NULL)) { 4525 struct sctp_auth_chunk *auth; 4526 4527 auth = (struct sctp_auth_chunk *) 4528 sctp_m_getptr(m, auth_offset, 4529 auth_len, chunk_buf); 4530 got_auth = 1; 4531 auth_skipped = 0; 4532 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, 4533 auth_offset)) { 4534 /* auth HMAC failed so dump it */ 4535 *offset = length; 4536 if (locked_tcb) { 4537 SCTP_TCB_UNLOCK(locked_tcb); 4538 } 4539 return (NULL); 4540 } else { 4541 /* remaining chunks are HMAC checked */ 4542 stcb->asoc.authenticated = 1; 4543 } 4544 } 4545 } 4546 if (stcb == NULL) { 4547 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__); 4548 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4549 msg); 4550 /* no association, so it's out of the blue... */ 4551 sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, op_err, 4552 mflowtype, mflowid, 4553 vrf_id, port); 4554 *offset = length; 4555 if (locked_tcb) { 4556 SCTP_TCB_UNLOCK(locked_tcb); 4557 } 4558 return (NULL); 4559 } 4560 asoc = &stcb->asoc; 4561 /* ABORT and SHUTDOWN can use either v_tag... */ 4562 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) || 4563 (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) || 4564 (ch->chunk_type == SCTP_PACKET_DROPPED)) { 4565 /* Take the T-bit always into account. */ 4566 if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) && 4567 (vtag_in == asoc->my_vtag)) || 4568 (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) && 4569 (vtag_in == asoc->peer_vtag))) { 4570 /* this is valid */ 4571 } else { 4572 /* drop this packet... */ 4573 SCTP_STAT_INCR(sctps_badvtag); 4574 if (locked_tcb) { 4575 SCTP_TCB_UNLOCK(locked_tcb); 4576 } 4577 return (NULL); 4578 } 4579 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 4580 if (vtag_in != asoc->my_vtag) { 4581 /* 4582 * this could be a stale SHUTDOWN-ACK or the 4583 * peer never got the SHUTDOWN-COMPLETE and 4584 * is still hung; we have started a new asoc 4585 * but it won't complete until the shutdown 4586 * is completed 4587 */ 4588 if (locked_tcb) { 4589 SCTP_TCB_UNLOCK(locked_tcb); 4590 } 4591 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__); 4592 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4593 msg); 4594 sctp_handle_ootb(m, iphlen, *offset, src, dst, 4595 sh, inp, op_err, 4596 mflowtype, mflowid, 4597 vrf_id, port); 4598 return (NULL); 4599 } 4600 } else { 4601 /* for all other chunks, vtag must match */ 4602 if (vtag_in != asoc->my_vtag) { 4603 /* invalid vtag... */ 4604 SCTPDBG(SCTP_DEBUG_INPUT3, 4605 "invalid vtag: %xh, expect %xh\n", 4606 vtag_in, asoc->my_vtag); 4607 SCTP_STAT_INCR(sctps_badvtag); 4608 if (locked_tcb) { 4609 SCTP_TCB_UNLOCK(locked_tcb); 4610 } 4611 *offset = length; 4612 return (NULL); 4613 } 4614 } 4615 } /* end if !SCTP_COOKIE_ECHO */ 4616 /* 4617 * process all control chunks... 4618 */ 4619 if (((ch->chunk_type == SCTP_SELECTIVE_ACK) || 4620 (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) || 4621 (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) && 4622 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) { 4623 /* implied cookie-ack.. we must have lost the ack */ 4624 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4625 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4626 stcb->asoc.overall_error_count, 4627 0, 4628 SCTP_FROM_SCTP_INPUT, 4629 __LINE__); 4630 } 4631 stcb->asoc.overall_error_count = 0; 4632 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, 4633 *netp); 4634 } 4635process_control_chunks: 4636 while (IS_SCTP_CONTROL(ch)) { 4637 /* validate chunk length */ 4638 chk_length = ntohs(ch->chunk_length); 4639 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n", 4640 ch->chunk_type, chk_length); 4641 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length); 4642 if (chk_length < sizeof(*ch) || 4643 (*offset + (int)chk_length) > length) { 4644 *offset = length; 4645 if (locked_tcb) { 4646 SCTP_TCB_UNLOCK(locked_tcb); 4647 } 4648 return (NULL); 4649 } 4650 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks); 4651 /* 4652 * INIT-ACK only gets the init ack "header" portion only 4653 * because we don't have to process the peer's COOKIE. All 4654 * others get a complete chunk. 4655 */ 4656 if ((ch->chunk_type == SCTP_INITIATION_ACK) || 4657 (ch->chunk_type == SCTP_INITIATION)) { 4658 /* get an init-ack chunk */ 4659 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4660 sizeof(struct sctp_init_ack_chunk), chunk_buf); 4661 if (ch == NULL) { 4662 *offset = length; 4663 if (locked_tcb) { 4664 SCTP_TCB_UNLOCK(locked_tcb); 4665 } 4666 return (NULL); 4667 } 4668 } else { 4669 /* For cookies and all other chunks. */ 4670 if (chk_length > sizeof(chunk_buf)) { 4671 /* 4672 * use just the size of the chunk buffer so 4673 * the front part of our chunks fit in 4674 * contiguous space up to the chunk buffer 4675 * size (508 bytes). For chunks that need to 4676 * get more than that they must use the 4677 * sctp_m_getptr() function or other means 4678 * (e.g. know how to parse mbuf chains). 4679 * Cookies do this already. 4680 */ 4681 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4682 (sizeof(chunk_buf) - 4), 4683 chunk_buf); 4684 if (ch == NULL) { 4685 *offset = length; 4686 if (locked_tcb) { 4687 SCTP_TCB_UNLOCK(locked_tcb); 4688 } 4689 return (NULL); 4690 } 4691 } else { 4692 /* We can fit it all */ 4693 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4694 chk_length, chunk_buf); 4695 if (ch == NULL) { 4696 SCTP_PRINTF("sctp_process_control: Can't get the all data....\n"); 4697 *offset = length; 4698 if (locked_tcb) { 4699 SCTP_TCB_UNLOCK(locked_tcb); 4700 } 4701 return (NULL); 4702 } 4703 } 4704 } 4705 num_chunks++; 4706 /* Save off the last place we got a control from */ 4707 if (stcb != NULL) { 4708 if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) { 4709 /* 4710 * allow last_control to be NULL if 4711 * ASCONF... ASCONF processing will find the 4712 * right net later 4713 */ 4714 if ((netp != NULL) && (*netp != NULL)) 4715 stcb->asoc.last_control_chunk_from = *netp; 4716 } 4717 } 4718#ifdef SCTP_AUDITING_ENABLED 4719 sctp_audit_log(0xB0, ch->chunk_type); 4720#endif 4721 4722 /* check to see if this chunk required auth, but isn't */ 4723 if ((stcb != NULL) && 4724 (stcb->asoc.auth_supported == 1) && 4725 sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) && 4726 !stcb->asoc.authenticated) { 4727 /* "silently" ignore */ 4728 SCTP_STAT_INCR(sctps_recvauthmissing); 4729 goto next_chunk; 4730 } 4731 switch (ch->chunk_type) { 4732 case SCTP_INITIATION: 4733 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n"); 4734 /* The INIT chunk must be the only chunk. */ 4735 if ((num_chunks > 1) || 4736 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4737 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4738 "INIT not the only chunk"); 4739 sctp_abort_association(inp, stcb, m, iphlen, 4740 src, dst, sh, op_err, 4741 mflowtype, mflowid, 4742 vrf_id, port); 4743 *offset = length; 4744 return (NULL); 4745 } 4746 /* Honor our resource limit. */ 4747 if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) { 4748 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 4749 sctp_abort_association(inp, stcb, m, iphlen, 4750 src, dst, sh, op_err, 4751 mflowtype, mflowid, 4752 vrf_id, port); 4753 *offset = length; 4754 return (NULL); 4755 } 4756 sctp_handle_init(m, iphlen, *offset, src, dst, sh, 4757 (struct sctp_init_chunk *)ch, inp, 4758 stcb, &abort_no_unlock, 4759 mflowtype, mflowid, 4760 vrf_id, port); 4761 *offset = length; 4762 if ((!abort_no_unlock) && (locked_tcb)) { 4763 SCTP_TCB_UNLOCK(locked_tcb); 4764 } 4765 return (NULL); 4766 break; 4767 case SCTP_PAD_CHUNK: 4768 break; 4769 case SCTP_INITIATION_ACK: 4770 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT-ACK\n"); 4771 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4772 /* We are not interested anymore */ 4773 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4774 ; 4775 } else { 4776 if (locked_tcb != stcb) { 4777 /* Very unlikely */ 4778 SCTP_TCB_UNLOCK(locked_tcb); 4779 } 4780 *offset = length; 4781 if (stcb) { 4782#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4783 so = SCTP_INP_SO(inp); 4784 atomic_add_int(&stcb->asoc.refcnt, 1); 4785 SCTP_TCB_UNLOCK(stcb); 4786 SCTP_SOCKET_LOCK(so, 1); 4787 SCTP_TCB_LOCK(stcb); 4788 atomic_subtract_int(&stcb->asoc.refcnt, 1); 4789#endif 4790 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 4791#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4792 SCTP_SOCKET_UNLOCK(so, 1); 4793#endif 4794 } 4795 return (NULL); 4796 } 4797 } 4798 /* The INIT-ACK chunk must be the only chunk. */ 4799 if ((num_chunks > 1) || 4800 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4801 *offset = length; 4802 if (locked_tcb) { 4803 SCTP_TCB_UNLOCK(locked_tcb); 4804 } 4805 return (NULL); 4806 } 4807 if ((netp) && (*netp)) { 4808 ret = sctp_handle_init_ack(m, iphlen, *offset, 4809 src, dst, sh, 4810 (struct sctp_init_ack_chunk *)ch, 4811 stcb, *netp, 4812 &abort_no_unlock, 4813 mflowtype, mflowid, 4814 vrf_id); 4815 } else { 4816 ret = -1; 4817 } 4818 *offset = length; 4819 if (abort_no_unlock) { 4820 return (NULL); 4821 } 4822 /* 4823 * Special case, I must call the output routine to 4824 * get the cookie echoed 4825 */ 4826 if ((stcb != NULL) && (ret == 0)) { 4827 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 4828 } 4829 if (locked_tcb) { 4830 SCTP_TCB_UNLOCK(locked_tcb); 4831 } 4832 return (NULL); 4833 break; 4834 case SCTP_SELECTIVE_ACK: 4835 { 4836 struct sctp_sack_chunk *sack; 4837 int abort_now = 0; 4838 uint32_t a_rwnd, cum_ack; 4839 uint16_t num_seg, num_dup; 4840 uint8_t flags; 4841 int offset_seg, offset_dup; 4842 4843 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK\n"); 4844 SCTP_STAT_INCR(sctps_recvsacks); 4845 if (stcb == NULL) { 4846 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing SACK chunk\n"); 4847 break; 4848 } 4849 if (chk_length < sizeof(struct sctp_sack_chunk)) { 4850 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n"); 4851 break; 4852 } 4853 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4854 /*- 4855 * If we have sent a shutdown-ack, we will pay no 4856 * attention to a sack sent in to us since 4857 * we don't care anymore. 4858 */ 4859 break; 4860 } 4861 sack = (struct sctp_sack_chunk *)ch; 4862 flags = ch->chunk_flags; 4863 cum_ack = ntohl(sack->sack.cum_tsn_ack); 4864 num_seg = ntohs(sack->sack.num_gap_ack_blks); 4865 num_dup = ntohs(sack->sack.num_dup_tsns); 4866 a_rwnd = (uint32_t) ntohl(sack->sack.a_rwnd); 4867 if (sizeof(struct sctp_sack_chunk) + 4868 num_seg * sizeof(struct sctp_gap_ack_block) + 4869 num_dup * sizeof(uint32_t) != chk_length) { 4870 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n"); 4871 break; 4872 } 4873 offset_seg = *offset + sizeof(struct sctp_sack_chunk); 4874 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 4875 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n", 4876 cum_ack, num_seg, a_rwnd); 4877 stcb->asoc.seen_a_sack_this_pkt = 1; 4878 if ((stcb->asoc.pr_sctp_cnt == 0) && 4879 (num_seg == 0) && 4880 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 4881 (stcb->asoc.saw_sack_with_frags == 0) && 4882 (stcb->asoc.saw_sack_with_nr_frags == 0) && 4883 (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) 4884 ) { 4885 /* 4886 * We have a SIMPLE sack having no 4887 * prior segments and data on sent 4888 * queue to be acked.. Use the 4889 * faster path sack processing. We 4890 * also allow window update sacks 4891 * with no missing segments to go 4892 * this way too. 4893 */ 4894 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, &abort_now, ecne_seen); 4895 } else { 4896 if (netp && *netp) 4897 sctp_handle_sack(m, offset_seg, offset_dup, stcb, 4898 num_seg, 0, num_dup, &abort_now, flags, 4899 cum_ack, a_rwnd, ecne_seen); 4900 } 4901 if (abort_now) { 4902 /* ABORT signal from sack processing */ 4903 *offset = length; 4904 return (NULL); 4905 } 4906 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 4907 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 4908 (stcb->asoc.stream_queue_cnt == 0)) { 4909 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 4910 } 4911 } 4912 break; 4913 /* 4914 * EY - nr_sack: If the received chunk is an 4915 * nr_sack chunk 4916 */ 4917 case SCTP_NR_SELECTIVE_ACK: 4918 { 4919 struct sctp_nr_sack_chunk *nr_sack; 4920 int abort_now = 0; 4921 uint32_t a_rwnd, cum_ack; 4922 uint16_t num_seg, num_nr_seg, num_dup; 4923 uint8_t flags; 4924 int offset_seg, offset_dup; 4925 4926 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK\n"); 4927 SCTP_STAT_INCR(sctps_recvsacks); 4928 if (stcb == NULL) { 4929 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing NR-SACK chunk\n"); 4930 break; 4931 } 4932 if (stcb->asoc.nrsack_supported == 0) { 4933 goto unknown_chunk; 4934 } 4935 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) { 4936 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR-SACK chunk, too small\n"); 4937 break; 4938 } 4939 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4940 /*- 4941 * If we have sent a shutdown-ack, we will pay no 4942 * attention to a sack sent in to us since 4943 * we don't care anymore. 4944 */ 4945 break; 4946 } 4947 nr_sack = (struct sctp_nr_sack_chunk *)ch; 4948 flags = ch->chunk_flags; 4949 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack); 4950 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks); 4951 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks); 4952 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns); 4953 a_rwnd = (uint32_t) ntohl(nr_sack->nr_sack.a_rwnd); 4954 if (sizeof(struct sctp_nr_sack_chunk) + 4955 (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) + 4956 num_dup * sizeof(uint32_t) != chk_length) { 4957 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n"); 4958 break; 4959 } 4960 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk); 4961 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 4962 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n", 4963 cum_ack, num_seg, a_rwnd); 4964 stcb->asoc.seen_a_sack_this_pkt = 1; 4965 if ((stcb->asoc.pr_sctp_cnt == 0) && 4966 (num_seg == 0) && (num_nr_seg == 0) && 4967 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 4968 (stcb->asoc.saw_sack_with_frags == 0) && 4969 (stcb->asoc.saw_sack_with_nr_frags == 0) && 4970 (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) { 4971 /* 4972 * We have a SIMPLE sack having no 4973 * prior segments and data on sent 4974 * queue to be acked. Use the faster 4975 * path sack processing. We also 4976 * allow window update sacks with no 4977 * missing segments to go this way 4978 * too. 4979 */ 4980 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, 4981 &abort_now, ecne_seen); 4982 } else { 4983 if (netp && *netp) 4984 sctp_handle_sack(m, offset_seg, offset_dup, stcb, 4985 num_seg, num_nr_seg, num_dup, &abort_now, flags, 4986 cum_ack, a_rwnd, ecne_seen); 4987 } 4988 if (abort_now) { 4989 /* ABORT signal from sack processing */ 4990 *offset = length; 4991 return (NULL); 4992 } 4993 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 4994 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 4995 (stcb->asoc.stream_queue_cnt == 0)) { 4996 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 4997 } 4998 } 4999 break; 5000 5001 case SCTP_HEARTBEAT_REQUEST: 5002 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n"); 5003 if ((stcb) && netp && *netp) { 5004 SCTP_STAT_INCR(sctps_recvheartbeat); 5005 sctp_send_heartbeat_ack(stcb, m, *offset, 5006 chk_length, *netp); 5007 5008 /* He's alive so give him credit */ 5009 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5010 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5011 stcb->asoc.overall_error_count, 5012 0, 5013 SCTP_FROM_SCTP_INPUT, 5014 __LINE__); 5015 } 5016 stcb->asoc.overall_error_count = 0; 5017 } 5018 break; 5019 case SCTP_HEARTBEAT_ACK: 5020 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT-ACK\n"); 5021 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) { 5022 /* Its not ours */ 5023 *offset = length; 5024 if (locked_tcb) { 5025 SCTP_TCB_UNLOCK(locked_tcb); 5026 } 5027 return (NULL); 5028 } 5029 /* He's alive so give him credit */ 5030 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5031 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5032 stcb->asoc.overall_error_count, 5033 0, 5034 SCTP_FROM_SCTP_INPUT, 5035 __LINE__); 5036 } 5037 stcb->asoc.overall_error_count = 0; 5038 SCTP_STAT_INCR(sctps_recvheartbeatack); 5039 if (netp && *netp) 5040 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch, 5041 stcb, *netp); 5042 break; 5043 case SCTP_ABORT_ASSOCIATION: 5044 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n", 5045 (void *)stcb); 5046 if ((stcb) && netp && *netp) 5047 sctp_handle_abort((struct sctp_abort_chunk *)ch, 5048 stcb, *netp); 5049 *offset = length; 5050 return (NULL); 5051 break; 5052 case SCTP_SHUTDOWN: 5053 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n", 5054 (void *)stcb); 5055 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) { 5056 *offset = length; 5057 if (locked_tcb) { 5058 SCTP_TCB_UNLOCK(locked_tcb); 5059 } 5060 return (NULL); 5061 } 5062 if (netp && *netp) { 5063 int abort_flag = 0; 5064 5065 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch, 5066 stcb, *netp, &abort_flag); 5067 if (abort_flag) { 5068 *offset = length; 5069 return (NULL); 5070 } 5071 } 5072 break; 5073 case SCTP_SHUTDOWN_ACK: 5074 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-ACK, stcb %p\n", (void *)stcb); 5075 if ((stcb) && (netp) && (*netp)) 5076 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp); 5077 *offset = length; 5078 return (NULL); 5079 break; 5080 5081 case SCTP_OPERATION_ERROR: 5082 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP-ERR\n"); 5083 if ((stcb) && netp && *netp && sctp_handle_error(ch, stcb, *netp) < 0) { 5084 *offset = length; 5085 return (NULL); 5086 } 5087 break; 5088 case SCTP_COOKIE_ECHO: 5089 SCTPDBG(SCTP_DEBUG_INPUT3, 5090 "SCTP_COOKIE-ECHO, stcb %p\n", (void *)stcb); 5091 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 5092 ; 5093 } else { 5094 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5095 /* We are not interested anymore */ 5096 abend: 5097 if (stcb) { 5098 SCTP_TCB_UNLOCK(stcb); 5099 } 5100 *offset = length; 5101 return (NULL); 5102 } 5103 } 5104 /* 5105 * First are we accepting? We do this again here 5106 * since it is possible that a previous endpoint WAS 5107 * listening responded to a INIT-ACK and then 5108 * closed. We opened and bound.. and are now no 5109 * longer listening. 5110 */ 5111 5112 if ((stcb == NULL) && (inp->sctp_socket->so_qlen >= inp->sctp_socket->so_qlimit)) { 5113 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 5114 (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) { 5115 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 5116 sctp_abort_association(inp, stcb, m, iphlen, 5117 src, dst, sh, op_err, 5118 mflowtype, mflowid, 5119 vrf_id, port); 5120 } 5121 *offset = length; 5122 return (NULL); 5123 } else { 5124 struct mbuf *ret_buf; 5125 struct sctp_inpcb *linp; 5126 5127 if (stcb) { 5128 linp = NULL; 5129 } else { 5130 linp = inp; 5131 } 5132 5133 if (linp) { 5134 SCTP_ASOC_CREATE_LOCK(linp); 5135 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 5136 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) { 5137 SCTP_ASOC_CREATE_UNLOCK(linp); 5138 goto abend; 5139 } 5140 } 5141 if (netp) { 5142 ret_buf = 5143 sctp_handle_cookie_echo(m, iphlen, 5144 *offset, 5145 src, dst, 5146 sh, 5147 (struct sctp_cookie_echo_chunk *)ch, 5148 &inp, &stcb, netp, 5149 auth_skipped, 5150 auth_offset, 5151 auth_len, 5152 &locked_tcb, 5153 mflowtype, 5154 mflowid, 5155 vrf_id, 5156 port); 5157 } else { 5158 ret_buf = NULL; 5159 } 5160 if (linp) { 5161 SCTP_ASOC_CREATE_UNLOCK(linp); 5162 } 5163 if (ret_buf == NULL) { 5164 if (locked_tcb) { 5165 SCTP_TCB_UNLOCK(locked_tcb); 5166 } 5167 SCTPDBG(SCTP_DEBUG_INPUT3, 5168 "GAK, null buffer\n"); 5169 *offset = length; 5170 return (NULL); 5171 } 5172 /* if AUTH skipped, see if it verified... */ 5173 if (auth_skipped) { 5174 got_auth = 1; 5175 auth_skipped = 0; 5176 } 5177 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) { 5178 /* 5179 * Restart the timer if we have 5180 * pending data 5181 */ 5182 struct sctp_tmit_chunk *chk; 5183 5184 chk = TAILQ_FIRST(&stcb->asoc.sent_queue); 5185 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 5186 } 5187 } 5188 break; 5189 case SCTP_COOKIE_ACK: 5190 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE-ACK, stcb %p\n", (void *)stcb); 5191 if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) { 5192 if (locked_tcb) { 5193 SCTP_TCB_UNLOCK(locked_tcb); 5194 } 5195 return (NULL); 5196 } 5197 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5198 /* We are not interested anymore */ 5199 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 5200 ; 5201 } else if (stcb) { 5202#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5203 so = SCTP_INP_SO(inp); 5204 atomic_add_int(&stcb->asoc.refcnt, 1); 5205 SCTP_TCB_UNLOCK(stcb); 5206 SCTP_SOCKET_LOCK(so, 1); 5207 SCTP_TCB_LOCK(stcb); 5208 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5209#endif 5210 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 5211#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5212 SCTP_SOCKET_UNLOCK(so, 1); 5213#endif 5214 *offset = length; 5215 return (NULL); 5216 } 5217 } 5218 /* He's alive so give him credit */ 5219 if ((stcb) && netp && *netp) { 5220 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5221 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5222 stcb->asoc.overall_error_count, 5223 0, 5224 SCTP_FROM_SCTP_INPUT, 5225 __LINE__); 5226 } 5227 stcb->asoc.overall_error_count = 0; 5228 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp); 5229 } 5230 break; 5231 case SCTP_ECN_ECHO: 5232 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-ECHO\n"); 5233 /* He's alive so give him credit */ 5234 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) { 5235 /* Its not ours */ 5236 if (locked_tcb) { 5237 SCTP_TCB_UNLOCK(locked_tcb); 5238 } 5239 *offset = length; 5240 return (NULL); 5241 } 5242 if (stcb) { 5243 if (stcb->asoc.ecn_supported == 0) { 5244 goto unknown_chunk; 5245 } 5246 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5247 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5248 stcb->asoc.overall_error_count, 5249 0, 5250 SCTP_FROM_SCTP_INPUT, 5251 __LINE__); 5252 } 5253 stcb->asoc.overall_error_count = 0; 5254 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, 5255 stcb); 5256 ecne_seen = 1; 5257 } 5258 break; 5259 case SCTP_ECN_CWR: 5260 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-CWR\n"); 5261 /* He's alive so give him credit */ 5262 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) { 5263 /* Its not ours */ 5264 if (locked_tcb) { 5265 SCTP_TCB_UNLOCK(locked_tcb); 5266 } 5267 *offset = length; 5268 return (NULL); 5269 } 5270 if (stcb) { 5271 if (stcb->asoc.ecn_supported == 0) { 5272 goto unknown_chunk; 5273 } 5274 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5275 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5276 stcb->asoc.overall_error_count, 5277 0, 5278 SCTP_FROM_SCTP_INPUT, 5279 __LINE__); 5280 } 5281 stcb->asoc.overall_error_count = 0; 5282 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp); 5283 } 5284 break; 5285 case SCTP_SHUTDOWN_COMPLETE: 5286 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-COMPLETE, stcb %p\n", (void *)stcb); 5287 /* must be first and only chunk */ 5288 if ((num_chunks > 1) || 5289 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 5290 *offset = length; 5291 if (locked_tcb) { 5292 SCTP_TCB_UNLOCK(locked_tcb); 5293 } 5294 return (NULL); 5295 } 5296 if ((stcb) && netp && *netp) { 5297 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch, 5298 stcb, *netp); 5299 } 5300 *offset = length; 5301 return (NULL); 5302 break; 5303 case SCTP_ASCONF: 5304 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n"); 5305 /* He's alive so give him credit */ 5306 if (stcb) { 5307 if (stcb->asoc.asconf_supported == 0) { 5308 goto unknown_chunk; 5309 } 5310 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5311 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5312 stcb->asoc.overall_error_count, 5313 0, 5314 SCTP_FROM_SCTP_INPUT, 5315 __LINE__); 5316 } 5317 stcb->asoc.overall_error_count = 0; 5318 sctp_handle_asconf(m, *offset, src, 5319 (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0); 5320 asconf_cnt++; 5321 } 5322 break; 5323 case SCTP_ASCONF_ACK: 5324 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF-ACK\n"); 5325 if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) { 5326 /* Its not ours */ 5327 if (locked_tcb) { 5328 SCTP_TCB_UNLOCK(locked_tcb); 5329 } 5330 *offset = length; 5331 return (NULL); 5332 } 5333 if ((stcb) && netp && *netp) { 5334 if (stcb->asoc.asconf_supported == 0) { 5335 goto unknown_chunk; 5336 } 5337 /* He's alive so give him credit */ 5338 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5339 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5340 stcb->asoc.overall_error_count, 5341 0, 5342 SCTP_FROM_SCTP_INPUT, 5343 __LINE__); 5344 } 5345 stcb->asoc.overall_error_count = 0; 5346 sctp_handle_asconf_ack(m, *offset, 5347 (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock); 5348 if (abort_no_unlock) 5349 return (NULL); 5350 } 5351 break; 5352 case SCTP_FORWARD_CUM_TSN: 5353 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD-TSN\n"); 5354 if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) { 5355 /* Its not ours */ 5356 if (locked_tcb) { 5357 SCTP_TCB_UNLOCK(locked_tcb); 5358 } 5359 *offset = length; 5360 return (NULL); 5361 } 5362 /* He's alive so give him credit */ 5363 if (stcb) { 5364 int abort_flag = 0; 5365 5366 if (stcb->asoc.prsctp_supported == 0) { 5367 goto unknown_chunk; 5368 } 5369 stcb->asoc.overall_error_count = 0; 5370 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5371 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5372 stcb->asoc.overall_error_count, 5373 0, 5374 SCTP_FROM_SCTP_INPUT, 5375 __LINE__); 5376 } 5377 *fwd_tsn_seen = 1; 5378 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5379 /* We are not interested anymore */ 5380#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5381 so = SCTP_INP_SO(inp); 5382 atomic_add_int(&stcb->asoc.refcnt, 1); 5383 SCTP_TCB_UNLOCK(stcb); 5384 SCTP_SOCKET_LOCK(so, 1); 5385 SCTP_TCB_LOCK(stcb); 5386 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5387#endif 5388 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_29); 5389#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5390 SCTP_SOCKET_UNLOCK(so, 1); 5391#endif 5392 *offset = length; 5393 return (NULL); 5394 } 5395 sctp_handle_forward_tsn(stcb, 5396 (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset); 5397 if (abort_flag) { 5398 *offset = length; 5399 return (NULL); 5400 } else { 5401 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5402 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5403 stcb->asoc.overall_error_count, 5404 0, 5405 SCTP_FROM_SCTP_INPUT, 5406 __LINE__); 5407 } 5408 stcb->asoc.overall_error_count = 0; 5409 } 5410 5411 } 5412 break; 5413 case SCTP_STREAM_RESET: 5414 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n"); 5415 if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) { 5416 /* Its not ours */ 5417 if (locked_tcb) { 5418 SCTP_TCB_UNLOCK(locked_tcb); 5419 } 5420 *offset = length; 5421 return (NULL); 5422 } 5423 if (stcb->asoc.reconfig_supported == 0) { 5424 goto unknown_chunk; 5425 } 5426 if (sctp_handle_stream_reset(stcb, m, *offset, ch)) { 5427 /* stop processing */ 5428 *offset = length; 5429 return (NULL); 5430 } 5431 break; 5432 case SCTP_PACKET_DROPPED: 5433 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n"); 5434 /* re-get it all please */ 5435 if (chk_length < sizeof(struct sctp_pktdrop_chunk)) { 5436 /* Its not ours */ 5437 if (locked_tcb) { 5438 SCTP_TCB_UNLOCK(locked_tcb); 5439 } 5440 *offset = length; 5441 return (NULL); 5442 } 5443 if (ch && (stcb) && netp && (*netp)) { 5444 if (stcb->asoc.pktdrop_supported == 0) { 5445 goto unknown_chunk; 5446 } 5447 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch, 5448 stcb, *netp, 5449 min(chk_length, (sizeof(chunk_buf) - 4))); 5450 5451 } 5452 break; 5453 case SCTP_AUTHENTICATION: 5454 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n"); 5455 if (stcb == NULL) { 5456 /* save the first AUTH for later processing */ 5457 if (auth_skipped == 0) { 5458 auth_offset = *offset; 5459 auth_len = chk_length; 5460 auth_skipped = 1; 5461 } 5462 /* skip this chunk (temporarily) */ 5463 goto next_chunk; 5464 } 5465 if (stcb->asoc.auth_supported == 0) { 5466 goto unknown_chunk; 5467 } 5468 if ((chk_length < (sizeof(struct sctp_auth_chunk))) || 5469 (chk_length > (sizeof(struct sctp_auth_chunk) + 5470 SCTP_AUTH_DIGEST_LEN_MAX))) { 5471 /* Its not ours */ 5472 if (locked_tcb) { 5473 SCTP_TCB_UNLOCK(locked_tcb); 5474 } 5475 *offset = length; 5476 return (NULL); 5477 } 5478 if (got_auth == 1) { 5479 /* skip this chunk... it's already auth'd */ 5480 goto next_chunk; 5481 } 5482 got_auth = 1; 5483 if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch, 5484 m, *offset)) { 5485 /* auth HMAC failed so dump the packet */ 5486 *offset = length; 5487 return (stcb); 5488 } else { 5489 /* remaining chunks are HMAC checked */ 5490 stcb->asoc.authenticated = 1; 5491 } 5492 break; 5493 5494 default: 5495 unknown_chunk: 5496 /* it's an unknown chunk! */ 5497 if ((ch->chunk_type & 0x40) && (stcb != NULL)) { 5498 struct mbuf *mm; 5499 struct sctp_paramhdr *phd; 5500 int len; 5501 5502 mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 5503 0, M_NOWAIT, 1, MT_DATA); 5504 if (mm) { 5505 len = min(SCTP_SIZE32(chk_length), (uint32_t) (length - *offset)); 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(len + sizeof(*phd)); 5516 SCTP_BUF_LEN(mm) = sizeof(*phd); 5517 SCTP_BUF_NEXT(mm) = SCTP_M_COPYM(m, *offset, len, M_NOWAIT); 5518 if (SCTP_BUF_NEXT(mm)) { 5519 if (sctp_pad_lastmbuf(SCTP_BUF_NEXT(mm), SCTP_SIZE32(len) - len, 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 sctp_log_mbc(SCTP_BUF_NEXT(mm), SCTP_MBUF_ICOPY); 5525 } 5526#endif 5527 sctp_queue_op_err(stcb, mm); 5528 } 5529 } else { 5530 sctp_m_freem(mm); 5531 } 5532 } 5533 } 5534 if ((ch->chunk_type & 0x80) == 0) { 5535 /* discard this packet */ 5536 *offset = length; 5537 return (stcb); 5538 } /* else skip this bad chunk and continue... */ 5539 break; 5540 } /* switch (ch->chunk_type) */ 5541 5542 5543next_chunk: 5544 /* get the next chunk */ 5545 *offset += SCTP_SIZE32(chk_length); 5546 if (*offset >= length) { 5547 /* no more data left in the mbuf chain */ 5548 break; 5549 } 5550 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 5551 sizeof(struct sctp_chunkhdr), chunk_buf); 5552 if (ch == NULL) { 5553 if (locked_tcb) { 5554 SCTP_TCB_UNLOCK(locked_tcb); 5555 } 5556 *offset = length; 5557 return (NULL); 5558 } 5559 } /* while */ 5560 5561 if (asconf_cnt > 0 && stcb != NULL) { 5562 sctp_send_asconf_ack(stcb); 5563 } 5564 return (stcb); 5565} 5566 5567 5568#ifdef INVARIANTS 5569#ifdef __GNUC__ 5570__attribute__((noinline)) 5571#endif 5572 void 5573 sctp_validate_no_locks(struct sctp_inpcb *inp) 5574{ 5575 struct sctp_tcb *lstcb; 5576 5577 LIST_FOREACH(lstcb, &inp->sctp_asoc_list, sctp_tcblist) { 5578 if (mtx_owned(&lstcb->tcb_mtx)) { 5579 panic("Own lock on stcb at return from input"); 5580 } 5581 } 5582 if (mtx_owned(&inp->inp_create_mtx)) { 5583 panic("Own create lock on inp"); 5584 } 5585 if (mtx_owned(&inp->inp_mtx)) { 5586 panic("Own inp lock on inp"); 5587 } 5588} 5589 5590#endif 5591 5592/* 5593 * common input chunk processing (v4 and v6) 5594 */ 5595void 5596sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length, 5597 struct sockaddr *src, struct sockaddr *dst, 5598 struct sctphdr *sh, struct sctp_chunkhdr *ch, 5599#if !defined(SCTP_WITH_NO_CSUM) 5600 uint8_t compute_crc, 5601#endif 5602 uint8_t ecn_bits, 5603 uint8_t mflowtype, uint32_t mflowid, 5604 uint32_t vrf_id, uint16_t port) 5605{ 5606 uint32_t high_tsn; 5607 int fwd_tsn_seen = 0, data_processed = 0; 5608 struct mbuf *m = *mm, *op_err; 5609 char msg[SCTP_DIAG_INFO_LEN]; 5610 int un_sent; 5611 int cnt_ctrl_ready = 0; 5612 struct sctp_inpcb *inp = NULL, *inp_decr = NULL; 5613 struct sctp_tcb *stcb = NULL; 5614 struct sctp_nets *net = NULL; 5615 5616 SCTP_STAT_INCR(sctps_recvdatagrams); 5617#ifdef SCTP_AUDITING_ENABLED 5618 sctp_audit_log(0xE0, 1); 5619 sctp_auditing(0, inp, stcb, net); 5620#endif 5621#if !defined(SCTP_WITH_NO_CSUM) 5622 if (compute_crc != 0) { 5623 uint32_t check, calc_check; 5624 5625 check = sh->checksum; 5626 sh->checksum = 0; 5627 calc_check = sctp_calculate_cksum(m, iphlen); 5628 sh->checksum = check; 5629 if (calc_check != check) { 5630 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x m:%p mlen:%d iphlen:%d\n", 5631 calc_check, check, (void *)m, length, iphlen); 5632 stcb = sctp_findassociation_addr(m, offset, src, dst, 5633 sh, ch, &inp, &net, vrf_id); 5634#if defined(INET) || defined(INET6) 5635 if ((net != NULL) && (port != 0)) { 5636 if (net->port == 0) { 5637 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr)); 5638 } 5639 net->port = port; 5640 } 5641#endif 5642 if ((net != NULL) && (mflowtype != M_HASHTYPE_NONE)) { 5643 net->flowtype = mflowtype; 5644 } 5645 if ((inp != NULL) && (stcb != NULL)) { 5646 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1); 5647 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED); 5648 } else if ((inp != NULL) && (stcb == NULL)) { 5649 inp_decr = inp; 5650 } 5651 SCTP_STAT_INCR(sctps_badsum); 5652 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors); 5653 goto out; 5654 } 5655 } 5656#endif 5657 /* Destination port of 0 is illegal, based on RFC4960. */ 5658 if (sh->dest_port == 0) { 5659 SCTP_STAT_INCR(sctps_hdrops); 5660 goto out; 5661 } 5662 stcb = sctp_findassociation_addr(m, offset, src, dst, 5663 sh, ch, &inp, &net, vrf_id); 5664#if defined(INET) || defined(INET6) 5665 if ((net != NULL) && (port != 0)) { 5666 if (net->port == 0) { 5667 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr)); 5668 } 5669 net->port = port; 5670 } 5671#endif 5672 if ((net != NULL) && (mflowtype != M_HASHTYPE_NONE)) { 5673 net->flowtype = mflowtype; 5674 } 5675 if (inp == NULL) { 5676 SCTP_STAT_INCR(sctps_noport); 5677 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) { 5678 goto out; 5679 } 5680 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 5681 sctp_send_shutdown_complete2(src, dst, sh, 5682 mflowtype, mflowid, 5683 vrf_id, port); 5684 goto out; 5685 } 5686 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) { 5687 goto out; 5688 } 5689 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) { 5690 if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) || 5691 ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) && 5692 (ch->chunk_type != SCTP_INIT))) { 5693 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5694 "Out of the blue"); 5695 sctp_send_abort(m, iphlen, src, dst, 5696 sh, 0, op_err, 5697 mflowtype, mflowid, 5698 vrf_id, port); 5699 } 5700 } 5701 goto out; 5702 } else if (stcb == NULL) { 5703 inp_decr = inp; 5704 } 5705#ifdef IPSEC 5706 /*- 5707 * I very much doubt any of the IPSEC stuff will work but I have no 5708 * idea, so I will leave it in place. 5709 */ 5710 if (inp != NULL) { 5711 switch (dst->sa_family) { 5712#ifdef INET 5713 case AF_INET: 5714 if (ipsec4_in_reject(m, &inp->ip_inp.inp)) { 5715 IPSECSTAT_INC(ips_in_polvio); 5716 SCTP_STAT_INCR(sctps_hdrops); 5717 goto out; 5718 } 5719 break; 5720#endif 5721#ifdef INET6 5722 case AF_INET6: 5723 if (ipsec6_in_reject(m, &inp->ip_inp.inp)) { 5724 IPSEC6STAT_INC(ips_in_polvio); 5725 SCTP_STAT_INCR(sctps_hdrops); 5726 goto out; 5727 } 5728 break; 5729#endif 5730 default: 5731 break; 5732 } 5733 } 5734#endif 5735 SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n", 5736 (void *)m, iphlen, offset, length, (void *)stcb); 5737 if (stcb) { 5738 /* always clear this before beginning a packet */ 5739 stcb->asoc.authenticated = 0; 5740 stcb->asoc.seen_a_sack_this_pkt = 0; 5741 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n", 5742 (void *)stcb, stcb->asoc.state); 5743 5744 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) || 5745 (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) { 5746 /*- 5747 * If we hit here, we had a ref count 5748 * up when the assoc was aborted and the 5749 * timer is clearing out the assoc, we should 5750 * NOT respond to any packet.. its OOTB. 5751 */ 5752 SCTP_TCB_UNLOCK(stcb); 5753 stcb = NULL; 5754 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__); 5755 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5756 msg); 5757 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5758 mflowtype, mflowid, 5759 vrf_id, port); 5760 goto out; 5761 } 5762 } 5763 if (IS_SCTP_CONTROL(ch)) { 5764 /* process the control portion of the SCTP packet */ 5765 /* sa_ignore NO_NULL_CHK */ 5766 stcb = sctp_process_control(m, iphlen, &offset, length, 5767 src, dst, sh, ch, 5768 inp, stcb, &net, &fwd_tsn_seen, 5769 mflowtype, mflowid, 5770 vrf_id, port); 5771 if (stcb) { 5772 /* 5773 * This covers us if the cookie-echo was there and 5774 * it changes our INP. 5775 */ 5776 inp = stcb->sctp_ep; 5777#if defined(INET) || defined(INET6) 5778 if ((net) && (port)) { 5779 if (net->port == 0) { 5780 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr)); 5781 } 5782 net->port = port; 5783 } 5784#endif 5785 } 5786 } else { 5787 /* 5788 * no control chunks, so pre-process DATA chunks (these 5789 * checks are taken care of by control processing) 5790 */ 5791 5792 /* 5793 * if DATA only packet, and auth is required, then punt... 5794 * can't have authenticated without any AUTH (control) 5795 * chunks 5796 */ 5797 if ((stcb != NULL) && 5798 (stcb->asoc.auth_supported == 1) && 5799 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) { 5800 /* "silently" ignore */ 5801 SCTP_STAT_INCR(sctps_recvauthmissing); 5802 goto out; 5803 } 5804 if (stcb == NULL) { 5805 /* out of the blue DATA chunk */ 5806 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__); 5807 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5808 msg); 5809 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5810 mflowtype, mflowid, 5811 vrf_id, port); 5812 goto out; 5813 } 5814 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) { 5815 /* v_tag mismatch! */ 5816 SCTP_STAT_INCR(sctps_badvtag); 5817 goto out; 5818 } 5819 } 5820 5821 if (stcb == NULL) { 5822 /* 5823 * no valid TCB for this packet, or we found it's a bad 5824 * packet while processing control, or we're done with this 5825 * packet (done or skip rest of data), so we drop it... 5826 */ 5827 goto out; 5828 } 5829 /* 5830 * DATA chunk processing 5831 */ 5832 /* plow through the data chunks while length > offset */ 5833 5834 /* 5835 * Rest should be DATA only. Check authentication state if AUTH for 5836 * DATA is required. 5837 */ 5838 if ((length > offset) && 5839 (stcb != NULL) && 5840 (stcb->asoc.auth_supported == 1) && 5841 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) && 5842 !stcb->asoc.authenticated) { 5843 /* "silently" ignore */ 5844 SCTP_STAT_INCR(sctps_recvauthmissing); 5845 SCTPDBG(SCTP_DEBUG_AUTH1, 5846 "Data chunk requires AUTH, skipped\n"); 5847 goto trigger_send; 5848 } 5849 if (length > offset) { 5850 int retval; 5851 5852 /* 5853 * First check to make sure our state is correct. We would 5854 * not get here unless we really did have a tag, so we don't 5855 * abort if this happens, just dump the chunk silently. 5856 */ 5857 switch (SCTP_GET_STATE(&stcb->asoc)) { 5858 case SCTP_STATE_COOKIE_ECHOED: 5859 /* 5860 * we consider data with valid tags in this state 5861 * shows us the cookie-ack was lost. Imply it was 5862 * there. 5863 */ 5864 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5865 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5866 stcb->asoc.overall_error_count, 5867 0, 5868 SCTP_FROM_SCTP_INPUT, 5869 __LINE__); 5870 } 5871 stcb->asoc.overall_error_count = 0; 5872 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net); 5873 break; 5874 case SCTP_STATE_COOKIE_WAIT: 5875 /* 5876 * We consider OOTB any data sent during asoc setup. 5877 */ 5878 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__); 5879 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5880 msg); 5881 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5882 mflowtype, mflowid, 5883 vrf_id, port); 5884 goto out; 5885 /* sa_ignore NOTREACHED */ 5886 break; 5887 case SCTP_STATE_EMPTY: /* should not happen */ 5888 case SCTP_STATE_INUSE: /* should not happen */ 5889 case SCTP_STATE_SHUTDOWN_RECEIVED: /* This is a peer error */ 5890 case SCTP_STATE_SHUTDOWN_ACK_SENT: 5891 default: 5892 goto out; 5893 /* sa_ignore NOTREACHED */ 5894 break; 5895 case SCTP_STATE_OPEN: 5896 case SCTP_STATE_SHUTDOWN_SENT: 5897 break; 5898 } 5899 /* plow through the data chunks while length > offset */ 5900 retval = sctp_process_data(mm, iphlen, &offset, length, 5901 src, dst, sh, 5902 inp, stcb, net, &high_tsn, 5903 mflowtype, mflowid, 5904 vrf_id, port); 5905 if (retval == 2) { 5906 /* 5907 * The association aborted, NO UNLOCK needed since 5908 * the association is destroyed. 5909 */ 5910 stcb = NULL; 5911 goto out; 5912 } 5913 data_processed = 1; 5914 /* 5915 * Anything important needs to have been m_copy'ed in 5916 * process_data 5917 */ 5918 } 5919 /* take care of ecn */ 5920 if ((data_processed == 1) && 5921 (stcb->asoc.ecn_supported == 1) && 5922 ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) { 5923 /* Yep, we need to add a ECNE */ 5924 sctp_send_ecn_echo(stcb, net, high_tsn); 5925 } 5926 if ((data_processed == 0) && (fwd_tsn_seen)) { 5927 int was_a_gap; 5928 uint32_t highest_tsn; 5929 5930 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) { 5931 highest_tsn = stcb->asoc.highest_tsn_inside_nr_map; 5932 } else { 5933 highest_tsn = stcb->asoc.highest_tsn_inside_map; 5934 } 5935 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn); 5936 stcb->asoc.send_sack = 1; 5937 sctp_sack_check(stcb, was_a_gap); 5938 } else if (fwd_tsn_seen) { 5939 stcb->asoc.send_sack = 1; 5940 } 5941 /* trigger send of any chunks in queue... */ 5942trigger_send: 5943#ifdef SCTP_AUDITING_ENABLED 5944 sctp_audit_log(0xE0, 2); 5945 sctp_auditing(1, inp, stcb, net); 5946#endif 5947 SCTPDBG(SCTP_DEBUG_INPUT1, 5948 "Check for chunk output prw:%d tqe:%d tf=%d\n", 5949 stcb->asoc.peers_rwnd, 5950 TAILQ_EMPTY(&stcb->asoc.control_send_queue), 5951 stcb->asoc.total_flight); 5952 un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight); 5953 if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 5954 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq; 5955 } 5956 if (cnt_ctrl_ready || 5957 ((un_sent) && 5958 (stcb->asoc.peers_rwnd > 0 || 5959 (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) { 5960 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n"); 5961 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 5962 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n"); 5963 } 5964#ifdef SCTP_AUDITING_ENABLED 5965 sctp_audit_log(0xE0, 3); 5966 sctp_auditing(2, inp, stcb, net); 5967#endif 5968out: 5969 if (stcb != NULL) { 5970 SCTP_TCB_UNLOCK(stcb); 5971 } 5972 if (inp_decr != NULL) { 5973 /* reduce ref-count */ 5974 SCTP_INP_WLOCK(inp_decr); 5975 SCTP_INP_DECR_REF(inp_decr); 5976 SCTP_INP_WUNLOCK(inp_decr); 5977 } 5978#ifdef INVARIANTS 5979 if (inp != NULL) { 5980 sctp_validate_no_locks(inp); 5981 } 5982#endif 5983 return; 5984} 5985 5986#if 0 5987static void 5988sctp_print_mbuf_chain(struct mbuf *m) 5989{ 5990 for (; m; m = SCTP_BUF_NEXT(m)) { 5991 SCTP_PRINTF("%p: m_len = %ld\n", (void *)m, SCTP_BUF_LEN(m)); 5992 if (SCTP_BUF_IS_EXTENDED(m)) 5993 SCTP_PRINTF("%p: extend_size = %d\n", (void *)m, SCTP_BUF_EXTEND_SIZE(m)); 5994 } 5995} 5996 5997#endif 5998 5999#ifdef INET 6000void 6001sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port) 6002{ 6003 struct mbuf *m; 6004 int iphlen; 6005 uint32_t vrf_id = 0; 6006 uint8_t ecn_bits; 6007 struct sockaddr_in src, dst; 6008 struct ip *ip; 6009 struct sctphdr *sh; 6010 struct sctp_chunkhdr *ch; 6011 int length, offset; 6012 6013#if !defined(SCTP_WITH_NO_CSUM) 6014 uint8_t compute_crc; 6015 6016#endif 6017 uint32_t mflowid; 6018 uint8_t mflowtype; 6019 6020 iphlen = off; 6021 if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) { 6022 SCTP_RELEASE_PKT(i_pak); 6023 return; 6024 } 6025 m = SCTP_HEADER_TO_CHAIN(i_pak); 6026#ifdef SCTP_MBUF_LOGGING 6027 /* Log in any input mbufs */ 6028 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 6029 sctp_log_mbc(m, SCTP_MBUF_INPUT); 6030 } 6031#endif 6032#ifdef SCTP_PACKET_LOGGING 6033 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) { 6034 sctp_packet_log(m); 6035 } 6036#endif 6037 SCTPDBG(SCTP_DEBUG_CRCOFFLOAD, 6038 "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n", 6039 m->m_pkthdr.len, 6040 if_name(m->m_pkthdr.rcvif), 6041 (int)m->m_pkthdr.csum_flags, CSUM_BITS); 6042 mflowid = m->m_pkthdr.flowid; 6043 mflowtype = M_HASHTYPE_GET(m); 6044 SCTP_STAT_INCR(sctps_recvpackets); 6045 SCTP_STAT_INCR_COUNTER64(sctps_inpackets); 6046 /* Get IP, SCTP, and first chunk header together in the first mbuf. */ 6047 offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr); 6048 if (SCTP_BUF_LEN(m) < offset) { 6049 if ((m = m_pullup(m, offset)) == NULL) { 6050 SCTP_STAT_INCR(sctps_hdrops); 6051 return; 6052 } 6053 } 6054 ip = mtod(m, struct ip *); 6055 sh = (struct sctphdr *)((caddr_t)ip + iphlen); 6056 ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr)); 6057 offset -= sizeof(struct sctp_chunkhdr); 6058 memset(&src, 0, sizeof(struct sockaddr_in)); 6059 src.sin_family = AF_INET; 6060 src.sin_len = sizeof(struct sockaddr_in); 6061 src.sin_port = sh->src_port; 6062 src.sin_addr = ip->ip_src; 6063 memset(&dst, 0, sizeof(struct sockaddr_in)); 6064 dst.sin_family = AF_INET; 6065 dst.sin_len = sizeof(struct sockaddr_in); 6066 dst.sin_port = sh->dest_port; 6067 dst.sin_addr = ip->ip_dst; 6068 length = ntohs(ip->ip_len); 6069 /* Validate mbuf chain length with IP payload length. */ 6070 if (SCTP_HEADER_LEN(m) != length) { 6071 SCTPDBG(SCTP_DEBUG_INPUT1, 6072 "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m)); 6073 SCTP_STAT_INCR(sctps_hdrops); 6074 goto out; 6075 } 6076 /* SCTP does not allow broadcasts or multicasts */ 6077 if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) { 6078 goto out; 6079 } 6080 if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) { 6081 goto out; 6082 } 6083 ecn_bits = ip->ip_tos; 6084#if defined(SCTP_WITH_NO_CSUM) 6085 SCTP_STAT_INCR(sctps_recvnocrc); 6086#else 6087 if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) { 6088 SCTP_STAT_INCR(sctps_recvhwcrc); 6089 compute_crc = 0; 6090 } else { 6091 SCTP_STAT_INCR(sctps_recvswcrc); 6092 compute_crc = 1; 6093 } 6094#endif 6095 sctp_common_input_processing(&m, iphlen, offset, length, 6096 (struct sockaddr *)&src, 6097 (struct sockaddr *)&dst, 6098 sh, ch, 6099#if !defined(SCTP_WITH_NO_CSUM) 6100 compute_crc, 6101#endif 6102 ecn_bits, 6103 mflowtype, mflowid, 6104 vrf_id, port); 6105out: 6106 if (m) { 6107 sctp_m_freem(m); 6108 } 6109 return; 6110} 6111 6112#if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP) 6113extern int *sctp_cpuarry; 6114 6115#endif 6116 6117void 6118sctp_input(struct mbuf *m, int off) 6119{ 6120#if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP) 6121 struct ip *ip; 6122 struct sctphdr *sh; 6123 int offset; 6124 int cpu_to_use; 6125 uint32_t flowid, tag; 6126 6127 if (mp_ncpus > 1) { 6128 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) { 6129 flowid = m->m_pkthdr.flowid; 6130 } else { 6131 /* 6132 * No flow id built by lower layers fix it so we 6133 * create one. 6134 */ 6135 offset = off + sizeof(struct sctphdr); 6136 if (SCTP_BUF_LEN(m) < offset) { 6137 if ((m = m_pullup(m, offset)) == NULL) { 6138 SCTP_STAT_INCR(sctps_hdrops); 6139 return; 6140 } 6141 } 6142 ip = mtod(m, struct ip *); 6143 sh = (struct sctphdr *)((caddr_t)ip + off); 6144 tag = htonl(sh->v_tag); 6145 flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port); 6146 m->m_pkthdr.flowid = flowid; 6147 M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE); 6148 } 6149 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus]; 6150 sctp_queue_to_mcore(m, off, cpu_to_use); 6151 return; 6152 } 6153#endif 6154 sctp_input_with_port(m, off, 0); 6155} 6156 6157#endif 6158