sctp_input.c revision 268526
1/*- 2 * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved. 3 * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved. 4 * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions are met: 8 * 9 * a) Redistributions of source code must retain the above copyright notice, 10 * this list of conditions and the following disclaimer. 11 * 12 * b) Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in 14 * the documentation and/or other materials provided with the distribution. 15 * 16 * c) Neither the name of Cisco Systems, Inc. nor the names of its 17 * contributors may be used to endorse or promote products derived 18 * from this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 22 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 24 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 30 * THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33#include <sys/cdefs.h> 34__FBSDID("$FreeBSD: head/sys/netinet/sctp_input.c 268526 2014-07-11 06:52:48Z tuexen $"); 35 36#include <netinet/sctp_os.h> 37#include <netinet/sctp_var.h> 38#include <netinet/sctp_sysctl.h> 39#include <netinet/sctp_pcb.h> 40#include <netinet/sctp_header.h> 41#include <netinet/sctputil.h> 42#include <netinet/sctp_output.h> 43#include <netinet/sctp_input.h> 44#include <netinet/sctp_auth.h> 45#include <netinet/sctp_indata.h> 46#include <netinet/sctp_asconf.h> 47#include <netinet/sctp_bsd_addr.h> 48#include <netinet/sctp_timer.h> 49#include <netinet/sctp_crc32.h> 50#if defined(INET) || defined(INET6) 51#include <netinet/udp.h> 52#endif 53#include <sys/smp.h> 54 55 56 57static void 58sctp_stop_all_cookie_timers(struct sctp_tcb *stcb) 59{ 60 struct sctp_nets *net; 61 62 /* 63 * This now not only stops all cookie timers it also stops any INIT 64 * timers as well. This will make sure that the timers are stopped 65 * in all collision cases. 66 */ 67 SCTP_TCB_LOCK_ASSERT(stcb); 68 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 69 if (net->rxt_timer.type == SCTP_TIMER_TYPE_COOKIE) { 70 sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE, 71 stcb->sctp_ep, 72 stcb, 73 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_1); 74 } else if (net->rxt_timer.type == SCTP_TIMER_TYPE_INIT) { 75 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, 76 stcb->sctp_ep, 77 stcb, 78 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_2); 79 } 80 } 81} 82 83/* INIT handler */ 84static void 85sctp_handle_init(struct mbuf *m, int iphlen, int offset, 86 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 87 struct sctp_init_chunk *cp, struct sctp_inpcb *inp, 88 struct sctp_tcb *stcb, int *abort_no_unlock, 89 uint8_t use_mflowid, uint32_t mflowid, 90 uint32_t vrf_id, uint16_t port) 91{ 92 struct sctp_init *init; 93 struct mbuf *op_err; 94 95 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_init: handling INIT tcb:%p\n", 96 (void *)stcb); 97 if (stcb == NULL) { 98 SCTP_INP_RLOCK(inp); 99 } 100 /* validate length */ 101 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_chunk)) { 102 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 103 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 104 use_mflowid, mflowid, 105 vrf_id, port); 106 if (stcb) 107 *abort_no_unlock = 1; 108 goto outnow; 109 } 110 /* validate parameters */ 111 init = &cp->init; 112 if (init->initiate_tag == 0) { 113 /* protocol error... send abort */ 114 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 115 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 116 use_mflowid, mflowid, 117 vrf_id, port); 118 if (stcb) 119 *abort_no_unlock = 1; 120 goto outnow; 121 } 122 if (ntohl(init->a_rwnd) < SCTP_MIN_RWND) { 123 /* invalid parameter... send abort */ 124 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 125 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 126 use_mflowid, mflowid, 127 vrf_id, port); 128 if (stcb) 129 *abort_no_unlock = 1; 130 goto outnow; 131 } 132 if (init->num_inbound_streams == 0) { 133 /* protocol error... send abort */ 134 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 135 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 136 use_mflowid, mflowid, 137 vrf_id, port); 138 if (stcb) 139 *abort_no_unlock = 1; 140 goto outnow; 141 } 142 if (init->num_outbound_streams == 0) { 143 /* protocol error... send abort */ 144 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 145 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 146 use_mflowid, mflowid, 147 vrf_id, port); 148 if (stcb) 149 *abort_no_unlock = 1; 150 goto outnow; 151 } 152 if (sctp_validate_init_auth_params(m, offset + sizeof(*cp), 153 offset + ntohs(cp->ch.chunk_length))) { 154 /* auth parameter(s) error... send abort */ 155 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 156 "Problem with AUTH parameters"); 157 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 158 use_mflowid, mflowid, 159 vrf_id, port); 160 if (stcb) 161 *abort_no_unlock = 1; 162 goto outnow; 163 } 164 /* 165 * We are only accepting if we have a socket with positive 166 * so_qlimit. 167 */ 168 if ((stcb == NULL) && 169 ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 170 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) || 171 (inp->sctp_socket == NULL) || 172 (inp->sctp_socket->so_qlimit == 0))) { 173 /* 174 * FIX ME ?? What about TCP model and we have a 175 * match/restart case? Actually no fix is needed. the lookup 176 * will always find the existing assoc so stcb would not be 177 * NULL. It may be questionable to do this since we COULD 178 * just send back the INIT-ACK and hope that the app did 179 * accept()'s by the time the COOKIE was sent. But there is 180 * a price to pay for COOKIE generation and I don't want to 181 * pay it on the chance that the app will actually do some 182 * accepts(). The App just looses and should NOT be in this 183 * state :-) 184 */ 185 if (SCTP_BASE_SYSCTL(sctp_blackhole) == 0) { 186 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 187 "No listener"); 188 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err, 189 use_mflowid, mflowid, 190 vrf_id, port); 191 } 192 goto outnow; 193 } 194 if ((stcb != NULL) && 195 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT)) { 196 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending SHUTDOWN-ACK\n"); 197 sctp_send_shutdown_ack(stcb, NULL); 198 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 199 } else { 200 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n"); 201 sctp_send_initiate_ack(inp, stcb, m, iphlen, offset, src, dst, 202 sh, cp, 203 use_mflowid, mflowid, 204 vrf_id, port, 205 ((stcb == NULL) ? SCTP_HOLDS_LOCK : SCTP_NOT_LOCKED)); 206 } 207outnow: 208 if (stcb == NULL) { 209 SCTP_INP_RUNLOCK(inp); 210 } 211} 212 213/* 214 * process peer "INIT/INIT-ACK" chunk returns value < 0 on error 215 */ 216 217int 218sctp_is_there_unsent_data(struct sctp_tcb *stcb, int so_locked 219#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING) 220 SCTP_UNUSED 221#endif 222) 223{ 224 int unsent_data = 0; 225 unsigned int i; 226 struct sctp_stream_queue_pending *sp; 227 struct sctp_association *asoc; 228 229 /* 230 * This function returns the number of streams that have true unsent 231 * data on them. Note that as it looks through it will clean up any 232 * places that have old data that has been sent but left at top of 233 * stream queue. 234 */ 235 asoc = &stcb->asoc; 236 SCTP_TCB_SEND_LOCK(stcb); 237 if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 238 /* Check to see if some data queued */ 239 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 240 /* sa_ignore FREED_MEMORY */ 241 sp = TAILQ_FIRST(&stcb->asoc.strmout[i].outqueue); 242 if (sp == NULL) { 243 continue; 244 } 245 if ((sp->msg_is_complete) && 246 (sp->length == 0) && 247 (sp->sender_all_done)) { 248 /* 249 * We are doing differed cleanup. Last time 250 * through when we took all the data the 251 * sender_all_done was not set. 252 */ 253 if (sp->put_last_out == 0) { 254 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n"); 255 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n", 256 sp->sender_all_done, 257 sp->length, 258 sp->msg_is_complete, 259 sp->put_last_out); 260 } 261 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1); 262 TAILQ_REMOVE(&stcb->asoc.strmout[i].outqueue, sp, next); 263 if (sp->net) { 264 sctp_free_remote_addr(sp->net); 265 sp->net = NULL; 266 } 267 if (sp->data) { 268 sctp_m_freem(sp->data); 269 sp->data = NULL; 270 } 271 sctp_free_a_strmoq(stcb, sp, so_locked); 272 } else { 273 unsent_data++; 274 break; 275 } 276 } 277 } 278 SCTP_TCB_SEND_UNLOCK(stcb); 279 return (unsent_data); 280} 281 282static int 283sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb) 284{ 285 struct sctp_init *init; 286 struct sctp_association *asoc; 287 struct sctp_nets *lnet; 288 unsigned int i; 289 290 init = &cp->init; 291 asoc = &stcb->asoc; 292 /* save off parameters */ 293 asoc->peer_vtag = ntohl(init->initiate_tag); 294 asoc->peers_rwnd = ntohl(init->a_rwnd); 295 /* init tsn's */ 296 asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1; 297 298 if (!TAILQ_EMPTY(&asoc->nets)) { 299 /* update any ssthresh's that may have a default */ 300 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) { 301 lnet->ssthresh = asoc->peers_rwnd; 302 if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) { 303 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION); 304 } 305 } 306 } 307 SCTP_TCB_SEND_LOCK(stcb); 308 if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) { 309 unsigned int newcnt; 310 struct sctp_stream_out *outs; 311 struct sctp_stream_queue_pending *sp, *nsp; 312 struct sctp_tmit_chunk *chk, *nchk; 313 314 /* abandon the upper streams */ 315 newcnt = ntohs(init->num_inbound_streams); 316 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) { 317 if (chk->rec.data.stream_number >= newcnt) { 318 TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next); 319 asoc->send_queue_cnt--; 320 if (asoc->strmout[chk->rec.data.stream_number].chunks_on_queues > 0) { 321 asoc->strmout[chk->rec.data.stream_number].chunks_on_queues--; 322#ifdef INVARIANTS 323 } else { 324 panic("No chunks on the queues for sid %u.", chk->rec.data.stream_number); 325#endif 326 } 327 if (chk->data != NULL) { 328 sctp_free_bufspace(stcb, asoc, chk, 1); 329 sctp_ulp_notify(SCTP_NOTIFY_UNSENT_DG_FAIL, stcb, 330 0, chk, SCTP_SO_NOT_LOCKED); 331 if (chk->data) { 332 sctp_m_freem(chk->data); 333 chk->data = NULL; 334 } 335 } 336 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 337 /* sa_ignore FREED_MEMORY */ 338 } 339 } 340 if (asoc->strmout) { 341 for (i = newcnt; i < asoc->pre_open_streams; i++) { 342 outs = &asoc->strmout[i]; 343 TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) { 344 TAILQ_REMOVE(&outs->outqueue, sp, next); 345 asoc->stream_queue_cnt--; 346 sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL, 347 stcb, 0, sp, SCTP_SO_NOT_LOCKED); 348 if (sp->data) { 349 sctp_m_freem(sp->data); 350 sp->data = NULL; 351 } 352 if (sp->net) { 353 sctp_free_remote_addr(sp->net); 354 sp->net = NULL; 355 } 356 /* Free the chunk */ 357 sctp_free_a_strmoq(stcb, sp, SCTP_SO_NOT_LOCKED); 358 /* sa_ignore FREED_MEMORY */ 359 } 360 } 361 } 362 /* cut back the count */ 363 asoc->pre_open_streams = newcnt; 364 } 365 SCTP_TCB_SEND_UNLOCK(stcb); 366 asoc->strm_realoutsize = asoc->streamoutcnt = asoc->pre_open_streams; 367 368 /* EY - nr_sack: initialize highest tsn in nr_mapping_array */ 369 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 370 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 371 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 372 } 373 /* This is the next one we expect */ 374 asoc->str_reset_seq_in = asoc->asconf_seq_in + 1; 375 376 asoc->mapping_array_base_tsn = ntohl(init->initial_tsn); 377 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in; 378 379 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 380 /* open the requested streams */ 381 382 if (asoc->strmin != NULL) { 383 /* Free the old ones */ 384 struct sctp_queued_to_read *ctl, *nctl; 385 386 for (i = 0; i < asoc->streamincnt; i++) { 387 TAILQ_FOREACH_SAFE(ctl, &asoc->strmin[i].inqueue, next, nctl) { 388 TAILQ_REMOVE(&asoc->strmin[i].inqueue, ctl, next); 389 sctp_free_remote_addr(ctl->whoFrom); 390 ctl->whoFrom = NULL; 391 sctp_m_freem(ctl->data); 392 ctl->data = NULL; 393 sctp_free_a_readq(stcb, ctl); 394 } 395 } 396 SCTP_FREE(asoc->strmin, SCTP_M_STRMI); 397 } 398 if (asoc->max_inbound_streams > ntohs(init->num_outbound_streams)) { 399 asoc->streamincnt = ntohs(init->num_outbound_streams); 400 } else { 401 asoc->streamincnt = asoc->max_inbound_streams; 402 } 403 SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt * 404 sizeof(struct sctp_stream_in), SCTP_M_STRMI); 405 if (asoc->strmin == NULL) { 406 /* we didn't get memory for the streams! */ 407 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n"); 408 return (-1); 409 } 410 for (i = 0; i < asoc->streamincnt; i++) { 411 asoc->strmin[i].stream_no = i; 412 asoc->strmin[i].last_sequence_delivered = 0xffff; 413 TAILQ_INIT(&asoc->strmin[i].inqueue); 414 asoc->strmin[i].delivery_started = 0; 415 } 416 /* 417 * load_address_from_init will put the addresses into the 418 * association when the COOKIE is processed or the INIT-ACK is 419 * processed. Both types of COOKIE's existing and new call this 420 * routine. It will remove addresses that are no longer in the 421 * association (for the restarting case where addresses are 422 * removed). Up front when the INIT arrives we will discard it if it 423 * is a restart and new addresses have been added. 424 */ 425 /* sa_ignore MEMLEAK */ 426 return (0); 427} 428 429/* 430 * INIT-ACK message processing/consumption returns value < 0 on error 431 */ 432static int 433sctp_process_init_ack(struct mbuf *m, int iphlen, int offset, 434 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 435 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 436 struct sctp_nets *net, int *abort_no_unlock, 437 uint8_t use_mflowid, uint32_t mflowid, 438 uint32_t vrf_id) 439{ 440 struct sctp_association *asoc; 441 struct mbuf *op_err; 442 int retval, abort_flag; 443 uint32_t initack_limit; 444 int nat_friendly = 0; 445 446 /* First verify that we have no illegal param's */ 447 abort_flag = 0; 448 449 op_err = sctp_arethere_unrecognized_parameters(m, 450 (offset + sizeof(struct sctp_init_chunk)), 451 &abort_flag, (struct sctp_chunkhdr *)cp, &nat_friendly); 452 if (abort_flag) { 453 /* Send an abort and notify peer */ 454 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 455 *abort_no_unlock = 1; 456 return (-1); 457 } 458 asoc = &stcb->asoc; 459 asoc->peer_supports_nat = (uint8_t) nat_friendly; 460 /* process the peer's parameters in the INIT-ACK */ 461 retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb); 462 if (retval < 0) { 463 return (retval); 464 } 465 initack_limit = offset + ntohs(cp->ch.chunk_length); 466 /* load all addresses */ 467 if ((retval = sctp_load_addresses_from_init(stcb, m, 468 (offset + sizeof(struct sctp_init_chunk)), initack_limit, 469 src, dst, NULL))) { 470 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 471 "Problem with address parameters"); 472 SCTPDBG(SCTP_DEBUG_INPUT1, 473 "Load addresses from INIT causes an abort %d\n", 474 retval); 475 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 476 src, dst, sh, op_err, 477 use_mflowid, mflowid, 478 vrf_id, net->port); 479 *abort_no_unlock = 1; 480 return (-1); 481 } 482 /* if the peer doesn't support asconf, flush the asconf queue */ 483 if (asoc->peer_supports_asconf == 0) { 484 struct sctp_asconf_addr *param, *nparam; 485 486 TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) { 487 TAILQ_REMOVE(&asoc->asconf_queue, param, next); 488 SCTP_FREE(param, SCTP_M_ASC_ADDR); 489 } 490 } 491 stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs, 492 stcb->asoc.local_hmacs); 493 if (op_err) { 494 sctp_queue_op_err(stcb, op_err); 495 /* queuing will steal away the mbuf chain to the out queue */ 496 op_err = NULL; 497 } 498 /* extract the cookie and queue it to "echo" it back... */ 499 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 500 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 501 stcb->asoc.overall_error_count, 502 0, 503 SCTP_FROM_SCTP_INPUT, 504 __LINE__); 505 } 506 stcb->asoc.overall_error_count = 0; 507 net->error_count = 0; 508 509 /* 510 * Cancel the INIT timer, We do this first before queueing the 511 * cookie. We always cancel at the primary to assue that we are 512 * canceling the timer started by the INIT which always goes to the 513 * primary. 514 */ 515 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb, 516 asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4); 517 518 /* calculate the RTO */ 519 net->RTO = sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, sctp_align_safe_nocopy, 520 SCTP_RTT_FROM_NON_DATA); 521 522 retval = sctp_send_cookie_echo(m, offset, stcb, net); 523 if (retval < 0) { 524 /* 525 * No cookie, we probably should send a op error. But in any 526 * case if there is no cookie in the INIT-ACK, we can 527 * abandon the peer, its broke. 528 */ 529 if (retval == -3) { 530 /* We abort with an error of missing mandatory param */ 531 op_err = sctp_generate_cause(SCTP_CAUSE_MISSING_PARAM, ""); 532 if (op_err) { 533 /* 534 * Expand beyond to include the mandatory 535 * param cookie 536 */ 537 struct sctp_inv_mandatory_param *mp; 538 539 SCTP_BUF_LEN(op_err) = 540 sizeof(struct sctp_inv_mandatory_param); 541 mp = mtod(op_err, 542 struct sctp_inv_mandatory_param *); 543 /* Subtract the reserved param */ 544 mp->length = 545 htons(sizeof(struct sctp_inv_mandatory_param) - 2); 546 mp->num_param = htonl(1); 547 mp->param = htons(SCTP_STATE_COOKIE); 548 mp->resv = 0; 549 } 550 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 551 src, dst, sh, op_err, 552 use_mflowid, mflowid, 553 vrf_id, net->port); 554 *abort_no_unlock = 1; 555 } 556 return (retval); 557 } 558 return (0); 559} 560 561static void 562sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp, 563 struct sctp_tcb *stcb, struct sctp_nets *net) 564{ 565 struct sockaddr_storage store; 566 struct sctp_nets *r_net, *f_net; 567 struct timeval tv; 568 int req_prim = 0; 569 uint16_t old_error_counter; 570 571#ifdef INET 572 struct sockaddr_in *sin; 573 574#endif 575#ifdef INET6 576 struct sockaddr_in6 *sin6; 577 578#endif 579 580 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) { 581 /* Invalid length */ 582 return; 583 } 584 memset(&store, 0, sizeof(store)); 585 switch (cp->heartbeat.hb_info.addr_family) { 586#ifdef INET 587 case AF_INET: 588 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) { 589 sin = (struct sockaddr_in *)&store; 590 sin->sin_family = cp->heartbeat.hb_info.addr_family; 591 sin->sin_len = cp->heartbeat.hb_info.addr_len; 592 sin->sin_port = stcb->rport; 593 memcpy(&sin->sin_addr, cp->heartbeat.hb_info.address, 594 sizeof(sin->sin_addr)); 595 } else { 596 return; 597 } 598 break; 599#endif 600#ifdef INET6 601 case AF_INET6: 602 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) { 603 sin6 = (struct sockaddr_in6 *)&store; 604 sin6->sin6_family = cp->heartbeat.hb_info.addr_family; 605 sin6->sin6_len = cp->heartbeat.hb_info.addr_len; 606 sin6->sin6_port = stcb->rport; 607 memcpy(&sin6->sin6_addr, cp->heartbeat.hb_info.address, 608 sizeof(sin6->sin6_addr)); 609 } else { 610 return; 611 } 612 break; 613#endif 614 default: 615 return; 616 } 617 r_net = sctp_findnet(stcb, (struct sockaddr *)&store); 618 if (r_net == NULL) { 619 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n"); 620 return; 621 } 622 if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) && 623 (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) && 624 (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) { 625 /* 626 * If the its a HB and it's random value is correct when can 627 * confirm the destination. 628 */ 629 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 630 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) { 631 stcb->asoc.primary_destination = r_net; 632 r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY; 633 f_net = TAILQ_FIRST(&stcb->asoc.nets); 634 if (f_net != r_net) { 635 /* 636 * first one on the list is NOT the primary 637 * sctp_cmpaddr() is much more efficent if 638 * the primary is the first on the list, 639 * make it so. 640 */ 641 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next); 642 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next); 643 } 644 req_prim = 1; 645 } 646 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 647 stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 648 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3); 649 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 650 } 651 old_error_counter = r_net->error_count; 652 r_net->error_count = 0; 653 r_net->hb_responded = 1; 654 tv.tv_sec = cp->heartbeat.hb_info.time_value_1; 655 tv.tv_usec = cp->heartbeat.hb_info.time_value_2; 656 /* Now lets do a RTO with this */ 657 r_net->RTO = sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, sctp_align_safe_nocopy, 658 SCTP_RTT_FROM_NON_DATA); 659 if (!(r_net->dest_state & SCTP_ADDR_REACHABLE)) { 660 r_net->dest_state |= SCTP_ADDR_REACHABLE; 661 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb, 662 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 663 } 664 if (r_net->dest_state & SCTP_ADDR_PF) { 665 r_net->dest_state &= ~SCTP_ADDR_PF; 666 stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net); 667 } 668 if (old_error_counter > 0) { 669 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3); 670 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 671 } 672 if (r_net == stcb->asoc.primary_destination) { 673 if (stcb->asoc.alternate) { 674 /* release the alternate, primary is good */ 675 sctp_free_remote_addr(stcb->asoc.alternate); 676 stcb->asoc.alternate = NULL; 677 } 678 } 679 /* Mobility adaptation */ 680 if (req_prim) { 681 if ((sctp_is_mobility_feature_on(stcb->sctp_ep, 682 SCTP_MOBILITY_BASE) || 683 sctp_is_mobility_feature_on(stcb->sctp_ep, 684 SCTP_MOBILITY_FASTHANDOFF)) && 685 sctp_is_mobility_feature_on(stcb->sctp_ep, 686 SCTP_MOBILITY_PRIM_DELETED)) { 687 688 sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED, stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_TIMER + SCTP_LOC_7); 689 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 690 SCTP_MOBILITY_FASTHANDOFF)) { 691 sctp_assoc_immediate_retrans(stcb, 692 stcb->asoc.primary_destination); 693 } 694 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 695 SCTP_MOBILITY_BASE)) { 696 sctp_move_chunks_from_net(stcb, 697 stcb->asoc.deleted_primary); 698 } 699 sctp_delete_prim_timer(stcb->sctp_ep, stcb, 700 stcb->asoc.deleted_primary); 701 } 702 } 703} 704 705static int 706sctp_handle_nat_colliding_state(struct sctp_tcb *stcb) 707{ 708 /* 709 * return 0 means we want you to proceed with the abort non-zero 710 * means no abort processing 711 */ 712 struct sctpasochead *head; 713 714 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_WAIT) { 715 /* generate a new vtag and send init */ 716 LIST_REMOVE(stcb, sctp_asocs); 717 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 718 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 719 /* 720 * put it in the bucket in the vtag hash of assoc's for the 721 * system 722 */ 723 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 724 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 725 return (1); 726 } 727 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) { 728 /* 729 * treat like a case where the cookie expired i.e.: - dump 730 * current cookie. - generate a new vtag. - resend init. 731 */ 732 /* generate a new vtag and send init */ 733 LIST_REMOVE(stcb, sctp_asocs); 734 stcb->asoc.state &= ~SCTP_STATE_COOKIE_ECHOED; 735 stcb->asoc.state |= SCTP_STATE_COOKIE_WAIT; 736 sctp_stop_all_cookie_timers(stcb); 737 sctp_toss_old_cookies(stcb, &stcb->asoc); 738 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 739 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 740 /* 741 * put it in the bucket in the vtag hash of assoc's for the 742 * system 743 */ 744 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 745 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 746 return (1); 747 } 748 return (0); 749} 750 751static int 752sctp_handle_nat_missing_state(struct sctp_tcb *stcb, 753 struct sctp_nets *net) 754{ 755 /* 756 * return 0 means we want you to proceed with the abort non-zero 757 * means no abort processing 758 */ 759 if (stcb->asoc.peer_supports_auth == 0) { 760 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n"); 761 return (0); 762 } 763 sctp_asconf_send_nat_state_update(stcb, net); 764 return (1); 765} 766 767 768static void 769sctp_handle_abort(struct sctp_abort_chunk *abort, 770 struct sctp_tcb *stcb, struct sctp_nets *net) 771{ 772#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 773 struct socket *so; 774 775#endif 776 uint16_t len; 777 uint16_t error; 778 779 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n"); 780 if (stcb == NULL) 781 return; 782 783 len = ntohs(abort->ch.chunk_length); 784 if (len > sizeof(struct sctp_chunkhdr)) { 785 /* 786 * Need to check the cause codes for our two magic nat 787 * aborts which don't kill the assoc necessarily. 788 */ 789 struct sctp_missing_nat_state *natc; 790 791 natc = (struct sctp_missing_nat_state *)(abort + 1); 792 error = ntohs(natc->cause); 793 if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) { 794 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n", 795 abort->ch.chunk_flags); 796 if (sctp_handle_nat_colliding_state(stcb)) { 797 return; 798 } 799 } else if (error == SCTP_CAUSE_NAT_MISSING_STATE) { 800 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n", 801 abort->ch.chunk_flags); 802 if (sctp_handle_nat_missing_state(stcb, net)) { 803 return; 804 } 805 } 806 } else { 807 error = 0; 808 } 809 /* stop any receive timers */ 810 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_6); 811 /* notify user of the abort and clean up... */ 812 sctp_abort_notification(stcb, 1, error, abort, SCTP_SO_NOT_LOCKED); 813 /* free the tcb */ 814 SCTP_STAT_INCR_COUNTER32(sctps_aborted); 815 if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) || 816 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 817 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 818 } 819#ifdef SCTP_ASOCLOG_OF_TSNS 820 sctp_print_out_track_log(stcb); 821#endif 822#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 823 so = SCTP_INP_SO(stcb->sctp_ep); 824 atomic_add_int(&stcb->asoc.refcnt, 1); 825 SCTP_TCB_UNLOCK(stcb); 826 SCTP_SOCKET_LOCK(so, 1); 827 SCTP_TCB_LOCK(stcb); 828 atomic_subtract_int(&stcb->asoc.refcnt, 1); 829#endif 830 stcb->asoc.state |= SCTP_STATE_WAS_ABORTED; 831 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 832 SCTP_FROM_SCTP_INPUT + SCTP_LOC_6); 833#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 834 SCTP_SOCKET_UNLOCK(so, 1); 835#endif 836 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n"); 837} 838 839static void 840sctp_start_net_timers(struct sctp_tcb *stcb) 841{ 842 uint32_t cnt_hb_sent; 843 struct sctp_nets *net; 844 845 cnt_hb_sent = 0; 846 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 847 /* 848 * For each network start: 1) A pmtu timer. 2) A HB timer 3) 849 * If the dest in unconfirmed send a hb as well if under 850 * max_hb_burst have been sent. 851 */ 852 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net); 853 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net); 854 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) && 855 (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) { 856 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 857 cnt_hb_sent++; 858 } 859 } 860 if (cnt_hb_sent) { 861 sctp_chunk_output(stcb->sctp_ep, stcb, 862 SCTP_OUTPUT_FROM_COOKIE_ACK, 863 SCTP_SO_NOT_LOCKED); 864 } 865} 866 867 868static void 869sctp_handle_shutdown(struct sctp_shutdown_chunk *cp, 870 struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag) 871{ 872 struct sctp_association *asoc; 873 int some_on_streamwheel; 874 875#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 876 struct socket *so; 877 878#endif 879 880 SCTPDBG(SCTP_DEBUG_INPUT2, 881 "sctp_handle_shutdown: handling SHUTDOWN\n"); 882 if (stcb == NULL) 883 return; 884 asoc = &stcb->asoc; 885 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) || 886 (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) { 887 return; 888 } 889 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) { 890 /* Shutdown NOT the expected size */ 891 return; 892 } else { 893 sctp_update_acked(stcb, cp, abort_flag); 894 if (*abort_flag) { 895 return; 896 } 897 } 898 if (asoc->control_pdapi) { 899 /* 900 * With a normal shutdown we assume the end of last record. 901 */ 902 SCTP_INP_READ_LOCK(stcb->sctp_ep); 903 asoc->control_pdapi->end_added = 1; 904 asoc->control_pdapi->pdapi_aborted = 1; 905 asoc->control_pdapi = NULL; 906 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 907#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 908 so = SCTP_INP_SO(stcb->sctp_ep); 909 atomic_add_int(&stcb->asoc.refcnt, 1); 910 SCTP_TCB_UNLOCK(stcb); 911 SCTP_SOCKET_LOCK(so, 1); 912 SCTP_TCB_LOCK(stcb); 913 atomic_subtract_int(&stcb->asoc.refcnt, 1); 914 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 915 /* assoc was freed while we were unlocked */ 916 SCTP_SOCKET_UNLOCK(so, 1); 917 return; 918 } 919#endif 920 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 921#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 922 SCTP_SOCKET_UNLOCK(so, 1); 923#endif 924 } 925 /* goto SHUTDOWN_RECEIVED state to block new requests */ 926 if (stcb->sctp_socket) { 927 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) && 928 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) && 929 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) { 930 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_RECEIVED); 931 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 932 /* 933 * notify upper layer that peer has initiated a 934 * shutdown 935 */ 936 sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 937 938 /* reset time */ 939 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 940 } 941 } 942 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) { 943 /* 944 * stop the shutdown timer, since we WILL move to 945 * SHUTDOWN-ACK-SENT. 946 */ 947 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_8); 948 } 949 /* Now is there unsent data on a stream somewhere? */ 950 some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED); 951 952 if (!TAILQ_EMPTY(&asoc->send_queue) || 953 !TAILQ_EMPTY(&asoc->sent_queue) || 954 some_on_streamwheel) { 955 /* By returning we will push more data out */ 956 return; 957 } else { 958 /* no outstanding data to send, so move on... */ 959 /* send SHUTDOWN-ACK */ 960 /* move to SHUTDOWN-ACK-SENT state */ 961 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) || 962 (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 963 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 964 } 965 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT); 966 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 967 sctp_stop_timers_for_shutdown(stcb); 968 sctp_send_shutdown_ack(stcb, net); 969 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, 970 stcb, net); 971 } 972} 973 974static void 975sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED, 976 struct sctp_tcb *stcb, 977 struct sctp_nets *net) 978{ 979 struct sctp_association *asoc; 980 981#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 982 struct socket *so; 983 984 so = SCTP_INP_SO(stcb->sctp_ep); 985#endif 986 SCTPDBG(SCTP_DEBUG_INPUT2, 987 "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n"); 988 if (stcb == NULL) 989 return; 990 991 asoc = &stcb->asoc; 992 /* process according to association state */ 993 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) || 994 (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) { 995 /* unexpected SHUTDOWN-ACK... do OOTB handling... */ 996 sctp_send_shutdown_complete(stcb, net, 1); 997 SCTP_TCB_UNLOCK(stcb); 998 return; 999 } 1000 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) && 1001 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) { 1002 /* unexpected SHUTDOWN-ACK... so ignore... */ 1003 SCTP_TCB_UNLOCK(stcb); 1004 return; 1005 } 1006 if (asoc->control_pdapi) { 1007 /* 1008 * With a normal shutdown we assume the end of last record. 1009 */ 1010 SCTP_INP_READ_LOCK(stcb->sctp_ep); 1011 asoc->control_pdapi->end_added = 1; 1012 asoc->control_pdapi->pdapi_aborted = 1; 1013 asoc->control_pdapi = NULL; 1014 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 1015#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1016 atomic_add_int(&stcb->asoc.refcnt, 1); 1017 SCTP_TCB_UNLOCK(stcb); 1018 SCTP_SOCKET_LOCK(so, 1); 1019 SCTP_TCB_LOCK(stcb); 1020 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1021 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1022 /* assoc was freed while we were unlocked */ 1023 SCTP_SOCKET_UNLOCK(so, 1); 1024 return; 1025 } 1026#endif 1027 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 1028#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1029 SCTP_SOCKET_UNLOCK(so, 1); 1030#endif 1031 } 1032#ifdef INVARIANTS 1033 if (!TAILQ_EMPTY(&asoc->send_queue) || 1034 !TAILQ_EMPTY(&asoc->sent_queue) || 1035 !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 1036 panic("Queues are not empty when handling SHUTDOWN-ACK"); 1037 } 1038#endif 1039 /* stop the timer */ 1040 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9); 1041 /* send SHUTDOWN-COMPLETE */ 1042 sctp_send_shutdown_complete(stcb, net, 0); 1043 /* notify upper layer protocol */ 1044 if (stcb->sctp_socket) { 1045 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1046 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 1047 stcb->sctp_socket->so_snd.sb_cc = 0; 1048 } 1049 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 1050 } 1051 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 1052 /* free the TCB but first save off the ep */ 1053#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1054 atomic_add_int(&stcb->asoc.refcnt, 1); 1055 SCTP_TCB_UNLOCK(stcb); 1056 SCTP_SOCKET_LOCK(so, 1); 1057 SCTP_TCB_LOCK(stcb); 1058 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1059#endif 1060 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1061 SCTP_FROM_SCTP_INPUT + SCTP_LOC_10); 1062#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1063 SCTP_SOCKET_UNLOCK(so, 1); 1064#endif 1065} 1066 1067/* 1068 * Skip past the param header and then we will find the chunk that caused the 1069 * problem. There are two possiblities ASCONF or FWD-TSN other than that and 1070 * our peer must be broken. 1071 */ 1072static void 1073sctp_process_unrecog_chunk(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr, 1074 struct sctp_nets *net) 1075{ 1076 struct sctp_chunkhdr *chk; 1077 1078 chk = (struct sctp_chunkhdr *)((caddr_t)phdr + sizeof(*phdr)); 1079 switch (chk->chunk_type) { 1080 case SCTP_ASCONF_ACK: 1081 case SCTP_ASCONF: 1082 sctp_asconf_cleanup(stcb, net); 1083 break; 1084 case SCTP_FORWARD_CUM_TSN: 1085 stcb->asoc.peer_supports_prsctp = 0; 1086 break; 1087 default: 1088 SCTPDBG(SCTP_DEBUG_INPUT2, 1089 "Peer does not support chunk type %d(%x)??\n", 1090 chk->chunk_type, (uint32_t) chk->chunk_type); 1091 break; 1092 } 1093} 1094 1095/* 1096 * Skip past the param header and then we will find the param that caused the 1097 * problem. There are a number of param's in a ASCONF OR the prsctp param 1098 * these will turn of specific features. 1099 */ 1100static void 1101sctp_process_unrecog_param(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr) 1102{ 1103 struct sctp_paramhdr *pbad; 1104 1105 pbad = phdr + 1; 1106 switch (ntohs(pbad->param_type)) { 1107 /* pr-sctp draft */ 1108 case SCTP_PRSCTP_SUPPORTED: 1109 stcb->asoc.peer_supports_prsctp = 0; 1110 break; 1111 case SCTP_SUPPORTED_CHUNK_EXT: 1112 break; 1113 /* draft-ietf-tsvwg-addip-sctp */ 1114 case SCTP_HAS_NAT_SUPPORT: 1115 stcb->asoc.peer_supports_nat = 0; 1116 break; 1117 case SCTP_ADD_IP_ADDRESS: 1118 case SCTP_DEL_IP_ADDRESS: 1119 case SCTP_SET_PRIM_ADDR: 1120 stcb->asoc.peer_supports_asconf = 0; 1121 break; 1122 case SCTP_SUCCESS_REPORT: 1123 case SCTP_ERROR_CAUSE_IND: 1124 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n"); 1125 SCTPDBG(SCTP_DEBUG_INPUT2, 1126 "Turning off ASCONF to this strange peer\n"); 1127 stcb->asoc.peer_supports_asconf = 0; 1128 break; 1129 default: 1130 SCTPDBG(SCTP_DEBUG_INPUT2, 1131 "Peer does not support param type %d(%x)??\n", 1132 pbad->param_type, (uint32_t) pbad->param_type); 1133 break; 1134 } 1135} 1136 1137static int 1138sctp_handle_error(struct sctp_chunkhdr *ch, 1139 struct sctp_tcb *stcb, struct sctp_nets *net) 1140{ 1141 int chklen; 1142 struct sctp_paramhdr *phdr; 1143 uint16_t error, error_type; 1144 uint16_t error_len; 1145 struct sctp_association *asoc; 1146 int adjust; 1147 1148#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1149 struct socket *so; 1150 1151#endif 1152 1153 /* parse through all of the errors and process */ 1154 asoc = &stcb->asoc; 1155 phdr = (struct sctp_paramhdr *)((caddr_t)ch + 1156 sizeof(struct sctp_chunkhdr)); 1157 chklen = ntohs(ch->chunk_length) - sizeof(struct sctp_chunkhdr); 1158 error = 0; 1159 while ((size_t)chklen >= sizeof(struct sctp_paramhdr)) { 1160 /* Process an Error Cause */ 1161 error_type = ntohs(phdr->param_type); 1162 error_len = ntohs(phdr->param_length); 1163 if ((error_len > chklen) || (error_len == 0)) { 1164 /* invalid param length for this param */ 1165 SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in error param- chunk left:%d errorlen:%d\n", 1166 chklen, error_len); 1167 return (0); 1168 } 1169 if (error == 0) { 1170 /* report the first error cause */ 1171 error = error_type; 1172 } 1173 switch (error_type) { 1174 case SCTP_CAUSE_INVALID_STREAM: 1175 case SCTP_CAUSE_MISSING_PARAM: 1176 case SCTP_CAUSE_INVALID_PARAM: 1177 case SCTP_CAUSE_NO_USER_DATA: 1178 SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %d back? We have a bug :/ (or do they?)\n", 1179 error_type); 1180 break; 1181 case SCTP_CAUSE_NAT_COLLIDING_STATE: 1182 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n", 1183 ch->chunk_flags); 1184 if (sctp_handle_nat_colliding_state(stcb)) { 1185 return (0); 1186 } 1187 break; 1188 case SCTP_CAUSE_NAT_MISSING_STATE: 1189 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n", 1190 ch->chunk_flags); 1191 if (sctp_handle_nat_missing_state(stcb, net)) { 1192 return (0); 1193 } 1194 break; 1195 case SCTP_CAUSE_STALE_COOKIE: 1196 /* 1197 * We only act if we have echoed a cookie and are 1198 * waiting. 1199 */ 1200 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) { 1201 int *p; 1202 1203 p = (int *)((caddr_t)phdr + sizeof(*phdr)); 1204 /* Save the time doubled */ 1205 asoc->cookie_preserve_req = ntohl(*p) << 1; 1206 asoc->stale_cookie_count++; 1207 if (asoc->stale_cookie_count > 1208 asoc->max_init_times) { 1209 sctp_abort_notification(stcb, 0, 0, NULL, SCTP_SO_NOT_LOCKED); 1210 /* now free the asoc */ 1211#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1212 so = SCTP_INP_SO(stcb->sctp_ep); 1213 atomic_add_int(&stcb->asoc.refcnt, 1); 1214 SCTP_TCB_UNLOCK(stcb); 1215 SCTP_SOCKET_LOCK(so, 1); 1216 SCTP_TCB_LOCK(stcb); 1217 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1218#endif 1219 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1220 SCTP_FROM_SCTP_INPUT + SCTP_LOC_11); 1221#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1222 SCTP_SOCKET_UNLOCK(so, 1); 1223#endif 1224 return (-1); 1225 } 1226 /* blast back to INIT state */ 1227 sctp_toss_old_cookies(stcb, &stcb->asoc); 1228 asoc->state &= ~SCTP_STATE_COOKIE_ECHOED; 1229 asoc->state |= SCTP_STATE_COOKIE_WAIT; 1230 sctp_stop_all_cookie_timers(stcb); 1231 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 1232 } 1233 break; 1234 case SCTP_CAUSE_UNRESOLVABLE_ADDR: 1235 /* 1236 * Nothing we can do here, we don't do hostname 1237 * addresses so if the peer does not like my IPv6 1238 * (or IPv4 for that matter) it does not matter. If 1239 * they don't support that type of address, they can 1240 * NOT possibly get that packet type... i.e. with no 1241 * IPv6 you can't recieve a IPv6 packet. so we can 1242 * safely ignore this one. If we ever added support 1243 * for HOSTNAME Addresses, then we would need to do 1244 * something here. 1245 */ 1246 break; 1247 case SCTP_CAUSE_UNRECOG_CHUNK: 1248 sctp_process_unrecog_chunk(stcb, phdr, net); 1249 break; 1250 case SCTP_CAUSE_UNRECOG_PARAM: 1251 sctp_process_unrecog_param(stcb, phdr); 1252 break; 1253 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN: 1254 /* 1255 * We ignore this since the timer will drive out a 1256 * new cookie anyway and there timer will drive us 1257 * to send a SHUTDOWN_COMPLETE. We can't send one 1258 * here since we don't have their tag. 1259 */ 1260 break; 1261 case SCTP_CAUSE_DELETING_LAST_ADDR: 1262 case SCTP_CAUSE_RESOURCE_SHORTAGE: 1263 case SCTP_CAUSE_DELETING_SRC_ADDR: 1264 /* 1265 * We should NOT get these here, but in a 1266 * ASCONF-ACK. 1267 */ 1268 SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a Operational Error?<%d>?\n", 1269 error_type); 1270 break; 1271 case SCTP_CAUSE_OUT_OF_RESC: 1272 /* 1273 * And what, pray tell do we do with the fact that 1274 * the peer is out of resources? Not really sure we 1275 * could do anything but abort. I suspect this 1276 * should have came WITH an abort instead of in a 1277 * OP-ERROR. 1278 */ 1279 break; 1280 default: 1281 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown error type = 0x%xh\n", 1282 error_type); 1283 break; 1284 } 1285 adjust = SCTP_SIZE32(error_len); 1286 chklen -= adjust; 1287 phdr = (struct sctp_paramhdr *)((caddr_t)phdr + adjust); 1288 } 1289 sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, error, ch, SCTP_SO_NOT_LOCKED); 1290 return (0); 1291} 1292 1293static int 1294sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset, 1295 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 1296 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 1297 struct sctp_nets *net, int *abort_no_unlock, 1298 uint8_t use_mflowid, uint32_t mflowid, 1299 uint32_t vrf_id) 1300{ 1301 struct sctp_init_ack *init_ack; 1302 struct mbuf *op_err; 1303 1304 SCTPDBG(SCTP_DEBUG_INPUT2, 1305 "sctp_handle_init_ack: handling INIT-ACK\n"); 1306 1307 if (stcb == NULL) { 1308 SCTPDBG(SCTP_DEBUG_INPUT2, 1309 "sctp_handle_init_ack: TCB is null\n"); 1310 return (-1); 1311 } 1312 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) { 1313 /* Invalid length */ 1314 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1315 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1316 src, dst, sh, op_err, 1317 use_mflowid, mflowid, 1318 vrf_id, net->port); 1319 *abort_no_unlock = 1; 1320 return (-1); 1321 } 1322 init_ack = &cp->init; 1323 /* validate parameters */ 1324 if (init_ack->initiate_tag == 0) { 1325 /* protocol error... send an abort */ 1326 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1327 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1328 src, dst, sh, op_err, 1329 use_mflowid, mflowid, 1330 vrf_id, net->port); 1331 *abort_no_unlock = 1; 1332 return (-1); 1333 } 1334 if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) { 1335 /* protocol error... send an abort */ 1336 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1337 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1338 src, dst, sh, op_err, 1339 use_mflowid, mflowid, 1340 vrf_id, net->port); 1341 *abort_no_unlock = 1; 1342 return (-1); 1343 } 1344 if (init_ack->num_inbound_streams == 0) { 1345 /* protocol error... send an abort */ 1346 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1347 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1348 src, dst, sh, op_err, 1349 use_mflowid, mflowid, 1350 vrf_id, net->port); 1351 *abort_no_unlock = 1; 1352 return (-1); 1353 } 1354 if (init_ack->num_outbound_streams == 0) { 1355 /* protocol error... send an abort */ 1356 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1357 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1358 src, dst, sh, op_err, 1359 use_mflowid, mflowid, 1360 vrf_id, net->port); 1361 *abort_no_unlock = 1; 1362 return (-1); 1363 } 1364 /* process according to association state... */ 1365 switch (stcb->asoc.state & SCTP_STATE_MASK) { 1366 case SCTP_STATE_COOKIE_WAIT: 1367 /* this is the expected state for this chunk */ 1368 /* process the INIT-ACK parameters */ 1369 if (stcb->asoc.primary_destination->dest_state & 1370 SCTP_ADDR_UNCONFIRMED) { 1371 /* 1372 * The primary is where we sent the INIT, we can 1373 * always consider it confirmed when the INIT-ACK is 1374 * returned. Do this before we load addresses 1375 * though. 1376 */ 1377 stcb->asoc.primary_destination->dest_state &= 1378 ~SCTP_ADDR_UNCONFIRMED; 1379 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 1380 stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED); 1381 } 1382 if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb, 1383 net, abort_no_unlock, 1384 use_mflowid, mflowid, 1385 vrf_id) < 0) { 1386 /* error in parsing parameters */ 1387 return (-1); 1388 } 1389 /* update our state */ 1390 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n"); 1391 SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_ECHOED); 1392 1393 /* reset the RTO calc */ 1394 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 1395 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 1396 stcb->asoc.overall_error_count, 1397 0, 1398 SCTP_FROM_SCTP_INPUT, 1399 __LINE__); 1400 } 1401 stcb->asoc.overall_error_count = 0; 1402 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 1403 /* 1404 * collapse the init timer back in case of a exponential 1405 * backoff 1406 */ 1407 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep, 1408 stcb, net); 1409 /* 1410 * the send at the end of the inbound data processing will 1411 * cause the cookie to be sent 1412 */ 1413 break; 1414 case SCTP_STATE_SHUTDOWN_SENT: 1415 /* incorrect state... discard */ 1416 break; 1417 case SCTP_STATE_COOKIE_ECHOED: 1418 /* incorrect state... discard */ 1419 break; 1420 case SCTP_STATE_OPEN: 1421 /* incorrect state... discard */ 1422 break; 1423 case SCTP_STATE_EMPTY: 1424 case SCTP_STATE_INUSE: 1425 default: 1426 /* incorrect state... discard */ 1427 return (-1); 1428 break; 1429 } 1430 SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n"); 1431 return (0); 1432} 1433 1434static struct sctp_tcb * 1435sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1436 struct sockaddr *src, struct sockaddr *dst, 1437 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1438 struct sctp_inpcb *inp, struct sctp_nets **netp, 1439 struct sockaddr *init_src, int *notification, 1440 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1441 uint8_t use_mflowid, uint32_t mflowid, 1442 uint32_t vrf_id, uint16_t port); 1443 1444 1445/* 1446 * handle a state cookie for an existing association m: input packet mbuf 1447 * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a 1448 * "split" mbuf and the cookie signature does not exist offset: offset into 1449 * mbuf to the cookie-echo chunk 1450 */ 1451static struct sctp_tcb * 1452sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset, 1453 struct sockaddr *src, struct sockaddr *dst, 1454 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1455 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp, 1456 struct sockaddr *init_src, int *notification, 1457 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1458 uint8_t use_mflowid, uint32_t mflowid, 1459 uint32_t vrf_id, uint16_t port) 1460{ 1461 struct sctp_association *asoc; 1462 struct sctp_init_chunk *init_cp, init_buf; 1463 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1464 struct sctp_nets *net; 1465 struct mbuf *op_err; 1466 int init_offset, initack_offset, i; 1467 int retval; 1468 int spec_flag = 0; 1469 uint32_t how_indx; 1470 1471 net = *netp; 1472 /* I know that the TCB is non-NULL from the caller */ 1473 asoc = &stcb->asoc; 1474 for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) { 1475 if (asoc->cookie_how[how_indx] == 0) 1476 break; 1477 } 1478 if (how_indx < sizeof(asoc->cookie_how)) { 1479 asoc->cookie_how[how_indx] = 1; 1480 } 1481 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 1482 /* SHUTDOWN came in after sending INIT-ACK */ 1483 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination); 1484 op_err = sctp_generate_cause(SCTP_CAUSE_COOKIE_IN_SHUTDOWN, ""); 1485 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 1486 use_mflowid, mflowid, 1487 vrf_id, net->port); 1488 if (how_indx < sizeof(asoc->cookie_how)) 1489 asoc->cookie_how[how_indx] = 2; 1490 return (NULL); 1491 } 1492 /* 1493 * find and validate the INIT chunk in the cookie (peer's info) the 1494 * INIT should start after the cookie-echo header struct (chunk 1495 * header, state cookie header struct) 1496 */ 1497 init_offset = offset += sizeof(struct sctp_cookie_echo_chunk); 1498 1499 init_cp = (struct sctp_init_chunk *) 1500 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 1501 (uint8_t *) & init_buf); 1502 if (init_cp == NULL) { 1503 /* could not pull a INIT chunk in cookie */ 1504 return (NULL); 1505 } 1506 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 1507 return (NULL); 1508 } 1509 /* 1510 * find and validate the INIT-ACK chunk in the cookie (my info) the 1511 * INIT-ACK follows the INIT chunk 1512 */ 1513 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 1514 initack_cp = (struct sctp_init_ack_chunk *) 1515 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 1516 (uint8_t *) & initack_buf); 1517 if (initack_cp == NULL) { 1518 /* could not pull INIT-ACK chunk in cookie */ 1519 return (NULL); 1520 } 1521 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 1522 return (NULL); 1523 } 1524 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1525 (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) { 1526 /* 1527 * case D in Section 5.2.4 Table 2: MMAA process accordingly 1528 * to get into the OPEN state 1529 */ 1530 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1531 /*- 1532 * Opps, this means that we somehow generated two vtag's 1533 * the same. I.e. we did: 1534 * Us Peer 1535 * <---INIT(tag=a)------ 1536 * ----INIT-ACK(tag=t)--> 1537 * ----INIT(tag=t)------> *1 1538 * <---INIT-ACK(tag=a)--- 1539 * <----CE(tag=t)------------- *2 1540 * 1541 * At point *1 we should be generating a different 1542 * tag t'. Which means we would throw away the CE and send 1543 * ours instead. Basically this is case C (throw away side). 1544 */ 1545 if (how_indx < sizeof(asoc->cookie_how)) 1546 asoc->cookie_how[how_indx] = 17; 1547 return (NULL); 1548 1549 } 1550 switch (SCTP_GET_STATE(asoc)) { 1551 case SCTP_STATE_COOKIE_WAIT: 1552 case SCTP_STATE_COOKIE_ECHOED: 1553 /* 1554 * INIT was sent but got a COOKIE_ECHO with the 1555 * correct tags... just accept it...but we must 1556 * process the init so that we can make sure we have 1557 * the right seq no's. 1558 */ 1559 /* First we must process the INIT !! */ 1560 retval = sctp_process_init(init_cp, stcb); 1561 if (retval < 0) { 1562 if (how_indx < sizeof(asoc->cookie_how)) 1563 asoc->cookie_how[how_indx] = 3; 1564 return (NULL); 1565 } 1566 /* we have already processed the INIT so no problem */ 1567 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, 1568 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_12); 1569 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_13); 1570 /* update current state */ 1571 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) 1572 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1573 else 1574 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1575 1576 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1577 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1578 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1579 stcb->sctp_ep, stcb, asoc->primary_destination); 1580 } 1581 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1582 sctp_stop_all_cookie_timers(stcb); 1583 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1584 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1585 (inp->sctp_socket->so_qlimit == 0) 1586 ) { 1587#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1588 struct socket *so; 1589 1590#endif 1591 /* 1592 * Here is where collision would go if we 1593 * did a connect() and instead got a 1594 * init/init-ack/cookie done before the 1595 * init-ack came back.. 1596 */ 1597 stcb->sctp_ep->sctp_flags |= 1598 SCTP_PCB_FLAGS_CONNECTED; 1599#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1600 so = SCTP_INP_SO(stcb->sctp_ep); 1601 atomic_add_int(&stcb->asoc.refcnt, 1); 1602 SCTP_TCB_UNLOCK(stcb); 1603 SCTP_SOCKET_LOCK(so, 1); 1604 SCTP_TCB_LOCK(stcb); 1605 atomic_add_int(&stcb->asoc.refcnt, -1); 1606 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1607 SCTP_SOCKET_UNLOCK(so, 1); 1608 return (NULL); 1609 } 1610#endif 1611 soisconnected(stcb->sctp_socket); 1612#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1613 SCTP_SOCKET_UNLOCK(so, 1); 1614#endif 1615 } 1616 /* notify upper layer */ 1617 *notification = SCTP_NOTIFY_ASSOC_UP; 1618 /* 1619 * since we did not send a HB make sure we don't 1620 * double things 1621 */ 1622 net->hb_responded = 1; 1623 net->RTO = sctp_calculate_rto(stcb, asoc, net, 1624 &cookie->time_entered, 1625 sctp_align_unsafe_makecopy, 1626 SCTP_RTT_FROM_NON_DATA); 1627 1628 if (stcb->asoc.sctp_autoclose_ticks && 1629 (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) { 1630 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 1631 inp, stcb, NULL); 1632 } 1633 break; 1634 default: 1635 /* 1636 * we're in the OPEN state (or beyond), so peer must 1637 * have simply lost the COOKIE-ACK 1638 */ 1639 break; 1640 } /* end switch */ 1641 sctp_stop_all_cookie_timers(stcb); 1642 /* 1643 * We ignore the return code here.. not sure if we should 1644 * somehow abort.. but we do have an existing asoc. This 1645 * really should not fail. 1646 */ 1647 if (sctp_load_addresses_from_init(stcb, m, 1648 init_offset + sizeof(struct sctp_init_chunk), 1649 initack_offset, src, dst, init_src)) { 1650 if (how_indx < sizeof(asoc->cookie_how)) 1651 asoc->cookie_how[how_indx] = 4; 1652 return (NULL); 1653 } 1654 /* respond with a COOKIE-ACK */ 1655 sctp_toss_old_cookies(stcb, asoc); 1656 sctp_send_cookie_ack(stcb); 1657 if (how_indx < sizeof(asoc->cookie_how)) 1658 asoc->cookie_how[how_indx] = 5; 1659 return (stcb); 1660 } 1661 if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1662 ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag && 1663 cookie->tie_tag_my_vtag == 0 && 1664 cookie->tie_tag_peer_vtag == 0) { 1665 /* 1666 * case C in Section 5.2.4 Table 2: XMOO silently discard 1667 */ 1668 if (how_indx < sizeof(asoc->cookie_how)) 1669 asoc->cookie_how[how_indx] = 6; 1670 return (NULL); 1671 } 1672 /* 1673 * If nat support, and the below and stcb is established, send back 1674 * a ABORT(colliding state) if we are established. 1675 */ 1676 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) && 1677 (asoc->peer_supports_nat) && 1678 ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1679 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1680 (asoc->peer_vtag == 0)))) { 1681 /* 1682 * Special case - Peer's support nat. We may have two init's 1683 * that we gave out the same tag on since one was not 1684 * established.. i.e. we get INIT from host-1 behind the nat 1685 * and we respond tag-a, we get a INIT from host-2 behind 1686 * the nat and we get tag-a again. Then we bring up host-1 1687 * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1). 1688 * Now we have colliding state. We must send an abort here 1689 * with colliding state indication. 1690 */ 1691 op_err = sctp_generate_cause(SCTP_CAUSE_NAT_COLLIDING_STATE, ""); 1692 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err, 1693 use_mflowid, mflowid, 1694 vrf_id, port); 1695 return (NULL); 1696 } 1697 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1698 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1699 (asoc->peer_vtag == 0))) { 1700 /* 1701 * case B in Section 5.2.4 Table 2: MXAA or MOAA my info 1702 * should be ok, re-accept peer info 1703 */ 1704 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1705 /* 1706 * Extension of case C. If we hit this, then the 1707 * random number generator returned the same vtag 1708 * when we first sent our INIT-ACK and when we later 1709 * sent our INIT. The side with the seq numbers that 1710 * are different will be the one that normnally 1711 * would have hit case C. This in effect "extends" 1712 * our vtags in this collision case to be 64 bits. 1713 * The same collision could occur aka you get both 1714 * vtag and seq number the same twice in a row.. but 1715 * is much less likely. If it did happen then we 1716 * would proceed through and bring up the assoc.. we 1717 * may end up with the wrong stream setup however.. 1718 * which would be bad.. but there is no way to 1719 * tell.. until we send on a stream that does not 1720 * exist :-) 1721 */ 1722 if (how_indx < sizeof(asoc->cookie_how)) 1723 asoc->cookie_how[how_indx] = 7; 1724 1725 return (NULL); 1726 } 1727 if (how_indx < sizeof(asoc->cookie_how)) 1728 asoc->cookie_how[how_indx] = 8; 1729 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_14); 1730 sctp_stop_all_cookie_timers(stcb); 1731 /* 1732 * since we did not send a HB make sure we don't double 1733 * things 1734 */ 1735 net->hb_responded = 1; 1736 if (stcb->asoc.sctp_autoclose_ticks && 1737 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 1738 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, 1739 NULL); 1740 } 1741 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1742 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 1743 1744 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) { 1745 /* 1746 * Ok the peer probably discarded our data (if we 1747 * echoed a cookie+data). So anything on the 1748 * sent_queue should be marked for retransmit, we 1749 * may not get something to kick us so it COULD 1750 * still take a timeout to move these.. but it can't 1751 * hurt to mark them. 1752 */ 1753 struct sctp_tmit_chunk *chk; 1754 1755 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 1756 if (chk->sent < SCTP_DATAGRAM_RESEND) { 1757 chk->sent = SCTP_DATAGRAM_RESEND; 1758 sctp_flight_size_decrease(chk); 1759 sctp_total_flight_decrease(stcb, chk); 1760 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 1761 spec_flag++; 1762 } 1763 } 1764 1765 } 1766 /* process the INIT info (peer's info) */ 1767 retval = sctp_process_init(init_cp, stcb); 1768 if (retval < 0) { 1769 if (how_indx < sizeof(asoc->cookie_how)) 1770 asoc->cookie_how[how_indx] = 9; 1771 return (NULL); 1772 } 1773 if (sctp_load_addresses_from_init(stcb, m, 1774 init_offset + sizeof(struct sctp_init_chunk), 1775 initack_offset, src, dst, init_src)) { 1776 if (how_indx < sizeof(asoc->cookie_how)) 1777 asoc->cookie_how[how_indx] = 10; 1778 return (NULL); 1779 } 1780 if ((asoc->state & SCTP_STATE_COOKIE_WAIT) || 1781 (asoc->state & SCTP_STATE_COOKIE_ECHOED)) { 1782 *notification = SCTP_NOTIFY_ASSOC_UP; 1783 1784 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1785 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1786 (inp->sctp_socket->so_qlimit == 0)) { 1787#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1788 struct socket *so; 1789 1790#endif 1791 stcb->sctp_ep->sctp_flags |= 1792 SCTP_PCB_FLAGS_CONNECTED; 1793#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1794 so = SCTP_INP_SO(stcb->sctp_ep); 1795 atomic_add_int(&stcb->asoc.refcnt, 1); 1796 SCTP_TCB_UNLOCK(stcb); 1797 SCTP_SOCKET_LOCK(so, 1); 1798 SCTP_TCB_LOCK(stcb); 1799 atomic_add_int(&stcb->asoc.refcnt, -1); 1800 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1801 SCTP_SOCKET_UNLOCK(so, 1); 1802 return (NULL); 1803 } 1804#endif 1805 soisconnected(stcb->sctp_socket); 1806#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1807 SCTP_SOCKET_UNLOCK(so, 1); 1808#endif 1809 } 1810 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) 1811 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1812 else 1813 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1814 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1815 } else if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) { 1816 SCTP_STAT_INCR_COUNTER32(sctps_restartestab); 1817 } else { 1818 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1819 } 1820 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1821 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1822 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1823 stcb->sctp_ep, stcb, asoc->primary_destination); 1824 } 1825 sctp_stop_all_cookie_timers(stcb); 1826 sctp_toss_old_cookies(stcb, asoc); 1827 sctp_send_cookie_ack(stcb); 1828 if (spec_flag) { 1829 /* 1830 * only if we have retrans set do we do this. What 1831 * this call does is get only the COOKIE-ACK out and 1832 * then when we return the normal call to 1833 * sctp_chunk_output will get the retrans out behind 1834 * this. 1835 */ 1836 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED); 1837 } 1838 if (how_indx < sizeof(asoc->cookie_how)) 1839 asoc->cookie_how[how_indx] = 11; 1840 1841 return (stcb); 1842 } 1843 if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1844 ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) && 1845 cookie->tie_tag_my_vtag == asoc->my_vtag_nonce && 1846 cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce && 1847 cookie->tie_tag_peer_vtag != 0) { 1848 struct sctpasochead *head; 1849 1850#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1851 struct socket *so; 1852 1853#endif 1854 1855 if (asoc->peer_supports_nat) { 1856 /* 1857 * This is a gross gross hack. Just call the 1858 * cookie_new code since we are allowing a duplicate 1859 * association. I hope this works... 1860 */ 1861 return (sctp_process_cookie_new(m, iphlen, offset, src, dst, 1862 sh, cookie, cookie_len, 1863 inp, netp, init_src, notification, 1864 auth_skipped, auth_offset, auth_len, 1865 use_mflowid, mflowid, 1866 vrf_id, port)); 1867 } 1868 /* 1869 * case A in Section 5.2.4 Table 2: XXMM (peer restarted) 1870 */ 1871 /* temp code */ 1872 if (how_indx < sizeof(asoc->cookie_how)) 1873 asoc->cookie_how[how_indx] = 12; 1874 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_15); 1875 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 1876 1877 /* notify upper layer */ 1878 *notification = SCTP_NOTIFY_ASSOC_RESTART; 1879 atomic_add_int(&stcb->asoc.refcnt, 1); 1880 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_OPEN) && 1881 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) && 1882 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) { 1883 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1884 } 1885 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) { 1886 SCTP_STAT_INCR_GAUGE32(sctps_restartestab); 1887 } else if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) { 1888 SCTP_STAT_INCR_GAUGE32(sctps_collisionestab); 1889 } 1890 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1891 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1892 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1893 stcb->sctp_ep, stcb, asoc->primary_destination); 1894 1895 } else if (!(asoc->state & SCTP_STATE_SHUTDOWN_SENT)) { 1896 /* move to OPEN state, if not in SHUTDOWN_SENT */ 1897 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1898 } 1899 asoc->pre_open_streams = 1900 ntohs(initack_cp->init.num_outbound_streams); 1901 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 1902 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 1903 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 1904 1905 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 1906 1907 asoc->str_reset_seq_in = asoc->init_seq_number; 1908 1909 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 1910 if (asoc->mapping_array) { 1911 memset(asoc->mapping_array, 0, 1912 asoc->mapping_array_size); 1913 } 1914 if (asoc->nr_mapping_array) { 1915 memset(asoc->nr_mapping_array, 0, 1916 asoc->mapping_array_size); 1917 } 1918 SCTP_TCB_UNLOCK(stcb); 1919#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1920 so = SCTP_INP_SO(stcb->sctp_ep); 1921 SCTP_SOCKET_LOCK(so, 1); 1922#endif 1923 SCTP_INP_INFO_WLOCK(); 1924 SCTP_INP_WLOCK(stcb->sctp_ep); 1925 SCTP_TCB_LOCK(stcb); 1926 atomic_add_int(&stcb->asoc.refcnt, -1); 1927 /* send up all the data */ 1928 SCTP_TCB_SEND_LOCK(stcb); 1929 1930 sctp_report_all_outbound(stcb, 0, 1, SCTP_SO_LOCKED); 1931 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 1932 stcb->asoc.strmout[i].chunks_on_queues = 0; 1933 stcb->asoc.strmout[i].stream_no = i; 1934 stcb->asoc.strmout[i].next_sequence_send = 0; 1935 stcb->asoc.strmout[i].last_msg_incomplete = 0; 1936 } 1937 /* process the INIT-ACK info (my info) */ 1938 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 1939 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1940 1941 /* pull from vtag hash */ 1942 LIST_REMOVE(stcb, sctp_asocs); 1943 /* re-insert to new vtag position */ 1944 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, 1945 SCTP_BASE_INFO(hashasocmark))]; 1946 /* 1947 * put it in the bucket in the vtag hash of assoc's for the 1948 * system 1949 */ 1950 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 1951 1952 SCTP_TCB_SEND_UNLOCK(stcb); 1953 SCTP_INP_WUNLOCK(stcb->sctp_ep); 1954 SCTP_INP_INFO_WUNLOCK(); 1955#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1956 SCTP_SOCKET_UNLOCK(so, 1); 1957#endif 1958 asoc->total_flight = 0; 1959 asoc->total_flight_count = 0; 1960 /* process the INIT info (peer's info) */ 1961 retval = sctp_process_init(init_cp, stcb); 1962 if (retval < 0) { 1963 if (how_indx < sizeof(asoc->cookie_how)) 1964 asoc->cookie_how[how_indx] = 13; 1965 1966 return (NULL); 1967 } 1968 /* 1969 * since we did not send a HB make sure we don't double 1970 * things 1971 */ 1972 net->hb_responded = 1; 1973 1974 if (sctp_load_addresses_from_init(stcb, m, 1975 init_offset + sizeof(struct sctp_init_chunk), 1976 initack_offset, src, dst, init_src)) { 1977 if (how_indx < sizeof(asoc->cookie_how)) 1978 asoc->cookie_how[how_indx] = 14; 1979 1980 return (NULL); 1981 } 1982 /* respond with a COOKIE-ACK */ 1983 sctp_stop_all_cookie_timers(stcb); 1984 sctp_toss_old_cookies(stcb, asoc); 1985 sctp_send_cookie_ack(stcb); 1986 if (how_indx < sizeof(asoc->cookie_how)) 1987 asoc->cookie_how[how_indx] = 15; 1988 1989 return (stcb); 1990 } 1991 if (how_indx < sizeof(asoc->cookie_how)) 1992 asoc->cookie_how[how_indx] = 16; 1993 /* all other cases... */ 1994 return (NULL); 1995} 1996 1997 1998/* 1999 * handle a state cookie for a new association m: input packet mbuf chain-- 2000 * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf 2001 * and the cookie signature does not exist offset: offset into mbuf to the 2002 * cookie-echo chunk length: length of the cookie chunk to: where the init 2003 * was from returns a new TCB 2004 */ 2005static struct sctp_tcb * 2006sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 2007 struct sockaddr *src, struct sockaddr *dst, 2008 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 2009 struct sctp_inpcb *inp, struct sctp_nets **netp, 2010 struct sockaddr *init_src, int *notification, 2011 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2012 uint8_t use_mflowid, uint32_t mflowid, 2013 uint32_t vrf_id, uint16_t port) 2014{ 2015 struct sctp_tcb *stcb; 2016 struct sctp_init_chunk *init_cp, init_buf; 2017 struct sctp_init_ack_chunk *initack_cp, initack_buf; 2018 struct sockaddr_storage sa_store; 2019 struct sockaddr *initack_src = (struct sockaddr *)&sa_store; 2020 struct sctp_association *asoc; 2021 int init_offset, initack_offset, initack_limit; 2022 int retval; 2023 int error = 0; 2024 uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE]; 2025 2026#ifdef INET 2027 struct sockaddr_in *sin; 2028 2029#endif 2030#ifdef INET6 2031 struct sockaddr_in6 *sin6; 2032 2033#endif 2034#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2035 struct socket *so; 2036 2037 so = SCTP_INP_SO(inp); 2038#endif 2039 2040 /* 2041 * find and validate the INIT chunk in the cookie (peer's info) the 2042 * INIT should start after the cookie-echo header struct (chunk 2043 * header, state cookie header struct) 2044 */ 2045 init_offset = offset + sizeof(struct sctp_cookie_echo_chunk); 2046 init_cp = (struct sctp_init_chunk *) 2047 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 2048 (uint8_t *) & init_buf); 2049 if (init_cp == NULL) { 2050 /* could not pull a INIT chunk in cookie */ 2051 SCTPDBG(SCTP_DEBUG_INPUT1, 2052 "process_cookie_new: could not pull INIT chunk hdr\n"); 2053 return (NULL); 2054 } 2055 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 2056 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n"); 2057 return (NULL); 2058 } 2059 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 2060 /* 2061 * find and validate the INIT-ACK chunk in the cookie (my info) the 2062 * INIT-ACK follows the INIT chunk 2063 */ 2064 initack_cp = (struct sctp_init_ack_chunk *) 2065 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 2066 (uint8_t *) & initack_buf); 2067 if (initack_cp == NULL) { 2068 /* could not pull INIT-ACK chunk in cookie */ 2069 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n"); 2070 return (NULL); 2071 } 2072 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 2073 return (NULL); 2074 } 2075 /* 2076 * NOTE: We can't use the INIT_ACK's chk_length to determine the 2077 * "initack_limit" value. This is because the chk_length field 2078 * includes the length of the cookie, but the cookie is omitted when 2079 * the INIT and INIT_ACK are tacked onto the cookie... 2080 */ 2081 initack_limit = offset + cookie_len; 2082 2083 /* 2084 * now that we know the INIT/INIT-ACK are in place, create a new TCB 2085 * and popluate 2086 */ 2087 2088 /* 2089 * Here we do a trick, we set in NULL for the proc/thread argument. 2090 * We do this since in effect we only use the p argument when the 2091 * socket is unbound and we must do an implicit bind. Since we are 2092 * getting a cookie, we cannot be unbound. 2093 */ 2094 stcb = sctp_aloc_assoc(inp, init_src, &error, 2095 ntohl(initack_cp->init.initiate_tag), vrf_id, 2096 (struct thread *)NULL 2097 ); 2098 if (stcb == NULL) { 2099 struct mbuf *op_err; 2100 2101 /* memory problem? */ 2102 SCTPDBG(SCTP_DEBUG_INPUT1, 2103 "process_cookie_new: no room for another TCB!\n"); 2104 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2105 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2106 src, dst, sh, op_err, 2107 use_mflowid, mflowid, 2108 vrf_id, port); 2109 return (NULL); 2110 } 2111 /* get the correct sctp_nets */ 2112 if (netp) 2113 *netp = sctp_findnet(stcb, init_src); 2114 2115 asoc = &stcb->asoc; 2116 /* get scope variables out of cookie */ 2117 asoc->scope.ipv4_local_scope = cookie->ipv4_scope; 2118 asoc->scope.site_scope = cookie->site_scope; 2119 asoc->scope.local_scope = cookie->local_scope; 2120 asoc->scope.loopback_scope = cookie->loopback_scope; 2121 2122 if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) || 2123 (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) { 2124 struct mbuf *op_err; 2125 2126 /* 2127 * Houston we have a problem. The EP changed while the 2128 * cookie was in flight. Only recourse is to abort the 2129 * association. 2130 */ 2131 atomic_add_int(&stcb->asoc.refcnt, 1); 2132 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2133 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2134 src, dst, sh, op_err, 2135 use_mflowid, mflowid, 2136 vrf_id, port); 2137#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2138 SCTP_TCB_UNLOCK(stcb); 2139 SCTP_SOCKET_LOCK(so, 1); 2140 SCTP_TCB_LOCK(stcb); 2141#endif 2142 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2143 SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 2144#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2145 SCTP_SOCKET_UNLOCK(so, 1); 2146#endif 2147 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2148 return (NULL); 2149 } 2150 /* process the INIT-ACK info (my info) */ 2151 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 2152 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 2153 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 2154 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 2155 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 2156 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 2157 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 2158 asoc->str_reset_seq_in = asoc->init_seq_number; 2159 2160 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 2161 2162 /* process the INIT info (peer's info) */ 2163 if (netp) 2164 retval = sctp_process_init(init_cp, stcb); 2165 else 2166 retval = 0; 2167 if (retval < 0) { 2168 atomic_add_int(&stcb->asoc.refcnt, 1); 2169#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2170 SCTP_TCB_UNLOCK(stcb); 2171 SCTP_SOCKET_LOCK(so, 1); 2172 SCTP_TCB_LOCK(stcb); 2173#endif 2174 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 2175#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2176 SCTP_SOCKET_UNLOCK(so, 1); 2177#endif 2178 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2179 return (NULL); 2180 } 2181 /* load all addresses */ 2182 if (sctp_load_addresses_from_init(stcb, m, 2183 init_offset + sizeof(struct sctp_init_chunk), initack_offset, 2184 src, dst, init_src)) { 2185 atomic_add_int(&stcb->asoc.refcnt, 1); 2186#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2187 SCTP_TCB_UNLOCK(stcb); 2188 SCTP_SOCKET_LOCK(so, 1); 2189 SCTP_TCB_LOCK(stcb); 2190#endif 2191 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_17); 2192#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2193 SCTP_SOCKET_UNLOCK(so, 1); 2194#endif 2195 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2196 return (NULL); 2197 } 2198 /* 2199 * verify any preceding AUTH chunk that was skipped 2200 */ 2201 /* pull the local authentication parameters from the cookie/init-ack */ 2202 sctp_auth_get_cookie_params(stcb, m, 2203 initack_offset + sizeof(struct sctp_init_ack_chunk), 2204 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk))); 2205 if (auth_skipped) { 2206 struct sctp_auth_chunk *auth; 2207 2208 auth = (struct sctp_auth_chunk *) 2209 sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf); 2210 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) { 2211 /* auth HMAC failed, dump the assoc and packet */ 2212 SCTPDBG(SCTP_DEBUG_AUTH1, 2213 "COOKIE-ECHO: AUTH failed\n"); 2214 atomic_add_int(&stcb->asoc.refcnt, 1); 2215#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2216 SCTP_TCB_UNLOCK(stcb); 2217 SCTP_SOCKET_LOCK(so, 1); 2218 SCTP_TCB_LOCK(stcb); 2219#endif 2220 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_18); 2221#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2222 SCTP_SOCKET_UNLOCK(so, 1); 2223#endif 2224 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2225 return (NULL); 2226 } else { 2227 /* remaining chunks checked... good to go */ 2228 stcb->asoc.authenticated = 1; 2229 } 2230 } 2231 /* update current state */ 2232 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2233 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 2234 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2235 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2236 stcb->sctp_ep, stcb, asoc->primary_destination); 2237 } 2238 sctp_stop_all_cookie_timers(stcb); 2239 SCTP_STAT_INCR_COUNTER32(sctps_passiveestab); 2240 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2241 2242 /* 2243 * if we're doing ASCONFs, check to see if we have any new local 2244 * addresses that need to get added to the peer (eg. addresses 2245 * changed while cookie echo in flight). This needs to be done 2246 * after we go to the OPEN state to do the correct asconf 2247 * processing. else, make sure we have the correct addresses in our 2248 * lists 2249 */ 2250 2251 /* warning, we re-use sin, sin6, sa_store here! */ 2252 /* pull in local_address (our "from" address) */ 2253 switch (cookie->laddr_type) { 2254#ifdef INET 2255 case SCTP_IPV4_ADDRESS: 2256 /* source addr is IPv4 */ 2257 sin = (struct sockaddr_in *)initack_src; 2258 memset(sin, 0, sizeof(*sin)); 2259 sin->sin_family = AF_INET; 2260 sin->sin_len = sizeof(struct sockaddr_in); 2261 sin->sin_addr.s_addr = cookie->laddress[0]; 2262 break; 2263#endif 2264#ifdef INET6 2265 case SCTP_IPV6_ADDRESS: 2266 /* source addr is IPv6 */ 2267 sin6 = (struct sockaddr_in6 *)initack_src; 2268 memset(sin6, 0, sizeof(*sin6)); 2269 sin6->sin6_family = AF_INET6; 2270 sin6->sin6_len = sizeof(struct sockaddr_in6); 2271 sin6->sin6_scope_id = cookie->scope_id; 2272 memcpy(&sin6->sin6_addr, cookie->laddress, 2273 sizeof(sin6->sin6_addr)); 2274 break; 2275#endif 2276 default: 2277 atomic_add_int(&stcb->asoc.refcnt, 1); 2278#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2279 SCTP_TCB_UNLOCK(stcb); 2280 SCTP_SOCKET_LOCK(so, 1); 2281 SCTP_TCB_LOCK(stcb); 2282#endif 2283 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_19); 2284#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2285 SCTP_SOCKET_UNLOCK(so, 1); 2286#endif 2287 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2288 return (NULL); 2289 } 2290 2291 /* set up to notify upper layer */ 2292 *notification = SCTP_NOTIFY_ASSOC_UP; 2293 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2294 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 2295 (inp->sctp_socket->so_qlimit == 0)) { 2296 /* 2297 * This is an endpoint that called connect() how it got a 2298 * cookie that is NEW is a bit of a mystery. It must be that 2299 * the INIT was sent, but before it got there.. a complete 2300 * INIT/INIT-ACK/COOKIE arrived. But of course then it 2301 * should have went to the other code.. not here.. oh well.. 2302 * a bit of protection is worth having.. 2303 */ 2304 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2305#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2306 atomic_add_int(&stcb->asoc.refcnt, 1); 2307 SCTP_TCB_UNLOCK(stcb); 2308 SCTP_SOCKET_LOCK(so, 1); 2309 SCTP_TCB_LOCK(stcb); 2310 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2311 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2312 SCTP_SOCKET_UNLOCK(so, 1); 2313 return (NULL); 2314 } 2315#endif 2316 soisconnected(stcb->sctp_socket); 2317#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2318 SCTP_SOCKET_UNLOCK(so, 1); 2319#endif 2320 } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 2321 (inp->sctp_socket->so_qlimit)) { 2322 /* 2323 * We don't want to do anything with this one. Since it is 2324 * the listening guy. The timer will get started for 2325 * accepted connections in the caller. 2326 */ 2327 ; 2328 } 2329 /* since we did not send a HB make sure we don't double things */ 2330 if ((netp) && (*netp)) 2331 (*netp)->hb_responded = 1; 2332 2333 if (stcb->asoc.sctp_autoclose_ticks && 2334 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2335 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL); 2336 } 2337 /* calculate the RTT */ 2338 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 2339 if ((netp) && (*netp)) { 2340 (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp, 2341 &cookie->time_entered, sctp_align_unsafe_makecopy, 2342 SCTP_RTT_FROM_NON_DATA); 2343 } 2344 /* respond with a COOKIE-ACK */ 2345 sctp_send_cookie_ack(stcb); 2346 2347 /* 2348 * check the address lists for any ASCONFs that need to be sent 2349 * AFTER the cookie-ack is sent 2350 */ 2351 sctp_check_address_list(stcb, m, 2352 initack_offset + sizeof(struct sctp_init_ack_chunk), 2353 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)), 2354 initack_src, cookie->local_scope, cookie->site_scope, 2355 cookie->ipv4_scope, cookie->loopback_scope); 2356 2357 2358 return (stcb); 2359} 2360 2361/* 2362 * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e 2363 * we NEED to make sure we are not already using the vtag. If so we 2364 * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit! 2365 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag, 2366 SCTP_BASE_INFO(hashasocmark))]; 2367 LIST_FOREACH(stcb, head, sctp_asocs) { 2368 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep)) { 2369 -- SEND ABORT - TRY AGAIN -- 2370 } 2371 } 2372*/ 2373 2374/* 2375 * handles a COOKIE-ECHO message stcb: modified to either a new or left as 2376 * existing (non-NULL) TCB 2377 */ 2378static struct mbuf * 2379sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset, 2380 struct sockaddr *src, struct sockaddr *dst, 2381 struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp, 2382 struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp, 2383 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2384 struct sctp_tcb **locked_tcb, 2385 uint8_t use_mflowid, uint32_t mflowid, 2386 uint32_t vrf_id, uint16_t port) 2387{ 2388 struct sctp_state_cookie *cookie; 2389 struct sctp_tcb *l_stcb = *stcb; 2390 struct sctp_inpcb *l_inp; 2391 struct sockaddr *to; 2392 struct sctp_pcb *ep; 2393 struct mbuf *m_sig; 2394 uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE]; 2395 uint8_t *sig; 2396 uint8_t cookie_ok = 0; 2397 unsigned int sig_offset, cookie_offset; 2398 unsigned int cookie_len; 2399 struct timeval now; 2400 struct timeval time_expires; 2401 int notification = 0; 2402 struct sctp_nets *netl; 2403 int had_a_existing_tcb = 0; 2404 int send_int_conf = 0; 2405 2406#ifdef INET 2407 struct sockaddr_in sin; 2408 2409#endif 2410#ifdef INET6 2411 struct sockaddr_in6 sin6; 2412 2413#endif 2414 2415 SCTPDBG(SCTP_DEBUG_INPUT2, 2416 "sctp_handle_cookie: handling COOKIE-ECHO\n"); 2417 2418 if (inp_p == NULL) { 2419 return (NULL); 2420 } 2421 cookie = &cp->cookie; 2422 cookie_offset = offset + sizeof(struct sctp_chunkhdr); 2423 cookie_len = ntohs(cp->ch.chunk_length); 2424 2425 if ((cookie->peerport != sh->src_port) && 2426 (cookie->myport != sh->dest_port) && 2427 (cookie->my_vtag != sh->v_tag)) { 2428 /* 2429 * invalid ports or bad tag. Note that we always leave the 2430 * v_tag in the header in network order and when we stored 2431 * it in the my_vtag slot we also left it in network order. 2432 * This maintains the match even though it may be in the 2433 * opposite byte order of the machine :-> 2434 */ 2435 return (NULL); 2436 } 2437 if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) + 2438 sizeof(struct sctp_init_chunk) + 2439 sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) { 2440 /* cookie too small */ 2441 return (NULL); 2442 } 2443 /* 2444 * split off the signature into its own mbuf (since it should not be 2445 * calculated in the sctp_hmac_m() call). 2446 */ 2447 sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE; 2448 m_sig = m_split(m, sig_offset, M_NOWAIT); 2449 if (m_sig == NULL) { 2450 /* out of memory or ?? */ 2451 return (NULL); 2452 } 2453#ifdef SCTP_MBUF_LOGGING 2454 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 2455 struct mbuf *mat; 2456 2457 for (mat = m_sig; mat; mat = SCTP_BUF_NEXT(mat)) { 2458 if (SCTP_BUF_IS_EXTENDED(mat)) { 2459 sctp_log_mb(mat, SCTP_MBUF_SPLIT); 2460 } 2461 } 2462 } 2463#endif 2464 2465 /* 2466 * compute the signature/digest for the cookie 2467 */ 2468 ep = &(*inp_p)->sctp_ep; 2469 l_inp = *inp_p; 2470 if (l_stcb) { 2471 SCTP_TCB_UNLOCK(l_stcb); 2472 } 2473 SCTP_INP_RLOCK(l_inp); 2474 if (l_stcb) { 2475 SCTP_TCB_LOCK(l_stcb); 2476 } 2477 /* which cookie is it? */ 2478 if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) && 2479 (ep->current_secret_number != ep->last_secret_number)) { 2480 /* it's the old cookie */ 2481 (void)sctp_hmac_m(SCTP_HMAC, 2482 (uint8_t *) ep->secret_key[(int)ep->last_secret_number], 2483 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2484 } else { 2485 /* it's the current cookie */ 2486 (void)sctp_hmac_m(SCTP_HMAC, 2487 (uint8_t *) ep->secret_key[(int)ep->current_secret_number], 2488 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2489 } 2490 /* get the signature */ 2491 SCTP_INP_RUNLOCK(l_inp); 2492 sig = (uint8_t *) sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *) & tmp_sig); 2493 if (sig == NULL) { 2494 /* couldn't find signature */ 2495 sctp_m_freem(m_sig); 2496 return (NULL); 2497 } 2498 /* compare the received digest with the computed digest */ 2499 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) { 2500 /* try the old cookie? */ 2501 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) && 2502 (ep->current_secret_number != ep->last_secret_number)) { 2503 /* compute digest with old */ 2504 (void)sctp_hmac_m(SCTP_HMAC, 2505 (uint8_t *) ep->secret_key[(int)ep->last_secret_number], 2506 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2507 /* compare */ 2508 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0) 2509 cookie_ok = 1; 2510 } 2511 } else { 2512 cookie_ok = 1; 2513 } 2514 2515 /* 2516 * Now before we continue we must reconstruct our mbuf so that 2517 * normal processing of any other chunks will work. 2518 */ 2519 { 2520 struct mbuf *m_at; 2521 2522 m_at = m; 2523 while (SCTP_BUF_NEXT(m_at) != NULL) { 2524 m_at = SCTP_BUF_NEXT(m_at); 2525 } 2526 SCTP_BUF_NEXT(m_at) = m_sig; 2527 } 2528 2529 if (cookie_ok == 0) { 2530 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n"); 2531 SCTPDBG(SCTP_DEBUG_INPUT2, 2532 "offset = %u, cookie_offset = %u, sig_offset = %u\n", 2533 (uint32_t) offset, cookie_offset, sig_offset); 2534 return (NULL); 2535 } 2536 /* 2537 * check the cookie timestamps to be sure it's not stale 2538 */ 2539 (void)SCTP_GETTIME_TIMEVAL(&now); 2540 /* Expire time is in Ticks, so we convert to seconds */ 2541 time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life); 2542 time_expires.tv_usec = cookie->time_entered.tv_usec; 2543 /* 2544 * TODO sctp_constants.h needs alternative time macros when _KERNEL 2545 * is undefined. 2546 */ 2547 if (timevalcmp(&now, &time_expires, >)) { 2548 /* cookie is stale! */ 2549 struct mbuf *op_err; 2550 struct sctp_stale_cookie_msg *scm; 2551 uint32_t tim; 2552 2553 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_stale_cookie_msg), 2554 0, M_NOWAIT, 1, MT_DATA); 2555 if (op_err == NULL) { 2556 /* FOOBAR */ 2557 return (NULL); 2558 } 2559 /* Set the len */ 2560 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_stale_cookie_msg); 2561 scm = mtod(op_err, struct sctp_stale_cookie_msg *); 2562 scm->ph.param_type = htons(SCTP_CAUSE_STALE_COOKIE); 2563 scm->ph.param_length = htons((sizeof(struct sctp_paramhdr) + 2564 (sizeof(uint32_t)))); 2565 /* seconds to usec */ 2566 tim = (now.tv_sec - time_expires.tv_sec) * 1000000; 2567 /* add in usec */ 2568 if (tim == 0) 2569 tim = now.tv_usec - cookie->time_entered.tv_usec; 2570 scm->time_usec = htonl(tim); 2571 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 2572 use_mflowid, mflowid, 2573 vrf_id, port); 2574 return (NULL); 2575 } 2576 /* 2577 * Now we must see with the lookup address if we have an existing 2578 * asoc. This will only happen if we were in the COOKIE-WAIT state 2579 * and a INIT collided with us and somewhere the peer sent the 2580 * cookie on another address besides the single address our assoc 2581 * had for him. In this case we will have one of the tie-tags set at 2582 * least AND the address field in the cookie can be used to look it 2583 * up. 2584 */ 2585 to = NULL; 2586 switch (cookie->addr_type) { 2587#ifdef INET6 2588 case SCTP_IPV6_ADDRESS: 2589 memset(&sin6, 0, sizeof(sin6)); 2590 sin6.sin6_family = AF_INET6; 2591 sin6.sin6_len = sizeof(sin6); 2592 sin6.sin6_port = sh->src_port; 2593 sin6.sin6_scope_id = cookie->scope_id; 2594 memcpy(&sin6.sin6_addr.s6_addr, cookie->address, 2595 sizeof(sin6.sin6_addr.s6_addr)); 2596 to = (struct sockaddr *)&sin6; 2597 break; 2598#endif 2599#ifdef INET 2600 case SCTP_IPV4_ADDRESS: 2601 memset(&sin, 0, sizeof(sin)); 2602 sin.sin_family = AF_INET; 2603 sin.sin_len = sizeof(sin); 2604 sin.sin_port = sh->src_port; 2605 sin.sin_addr.s_addr = cookie->address[0]; 2606 to = (struct sockaddr *)&sin; 2607 break; 2608#endif 2609 default: 2610 /* This should not happen */ 2611 return (NULL); 2612 } 2613 if ((*stcb == NULL) && to) { 2614 /* Yep, lets check */ 2615 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL); 2616 if (*stcb == NULL) { 2617 /* 2618 * We should have only got back the same inp. If we 2619 * got back a different ep we have a problem. The 2620 * original findep got back l_inp and now 2621 */ 2622 if (l_inp != *inp_p) { 2623 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n"); 2624 } 2625 } else { 2626 if (*locked_tcb == NULL) { 2627 /* 2628 * In this case we found the assoc only 2629 * after we locked the create lock. This 2630 * means we are in a colliding case and we 2631 * must make sure that we unlock the tcb if 2632 * its one of the cases where we throw away 2633 * the incoming packets. 2634 */ 2635 *locked_tcb = *stcb; 2636 2637 /* 2638 * We must also increment the inp ref count 2639 * since the ref_count flags was set when we 2640 * did not find the TCB, now we found it 2641 * which reduces the refcount.. we must 2642 * raise it back out to balance it all :-) 2643 */ 2644 SCTP_INP_INCR_REF((*stcb)->sctp_ep); 2645 if ((*stcb)->sctp_ep != l_inp) { 2646 SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n", 2647 (void *)(*stcb)->sctp_ep, (void *)l_inp); 2648 } 2649 } 2650 } 2651 } 2652 if (to == NULL) { 2653 return (NULL); 2654 } 2655 cookie_len -= SCTP_SIGNATURE_SIZE; 2656 if (*stcb == NULL) { 2657 /* this is the "normal" case... get a new TCB */ 2658 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh, 2659 cookie, cookie_len, *inp_p, 2660 netp, to, ¬ification, 2661 auth_skipped, auth_offset, auth_len, 2662 use_mflowid, mflowid, 2663 vrf_id, port); 2664 } else { 2665 /* this is abnormal... cookie-echo on existing TCB */ 2666 had_a_existing_tcb = 1; 2667 *stcb = sctp_process_cookie_existing(m, iphlen, offset, 2668 src, dst, sh, 2669 cookie, cookie_len, *inp_p, *stcb, netp, to, 2670 ¬ification, auth_skipped, auth_offset, auth_len, 2671 use_mflowid, mflowid, 2672 vrf_id, port); 2673 } 2674 2675 if (*stcb == NULL) { 2676 /* still no TCB... must be bad cookie-echo */ 2677 return (NULL); 2678 } 2679 if ((*netp != NULL) && (use_mflowid != 0)) { 2680 (*netp)->flowid = mflowid; 2681#ifdef INVARIANTS 2682 (*netp)->flowidset = 1; 2683#endif 2684 } 2685 /* 2686 * Ok, we built an association so confirm the address we sent the 2687 * INIT-ACK to. 2688 */ 2689 netl = sctp_findnet(*stcb, to); 2690 /* 2691 * This code should in theory NOT run but 2692 */ 2693 if (netl == NULL) { 2694 /* TSNH! Huh, why do I need to add this address here? */ 2695 if (sctp_add_remote_addr(*stcb, to, NULL, SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) { 2696 return (NULL); 2697 } 2698 netl = sctp_findnet(*stcb, to); 2699 } 2700 if (netl) { 2701 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) { 2702 netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 2703 (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL, 2704 netl); 2705 send_int_conf = 1; 2706 } 2707 } 2708 sctp_start_net_timers(*stcb); 2709 if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) { 2710 if (!had_a_existing_tcb || 2711 (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) { 2712 /* 2713 * If we have a NEW cookie or the connect never 2714 * reached the connected state during collision we 2715 * must do the TCP accept thing. 2716 */ 2717 struct socket *so, *oso; 2718 struct sctp_inpcb *inp; 2719 2720 if (notification == SCTP_NOTIFY_ASSOC_RESTART) { 2721 /* 2722 * For a restart we will keep the same 2723 * socket, no need to do anything. I THINK!! 2724 */ 2725 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2726 if (send_int_conf) { 2727 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2728 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2729 } 2730 return (m); 2731 } 2732 oso = (*inp_p)->sctp_socket; 2733 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2734 SCTP_TCB_UNLOCK((*stcb)); 2735 CURVNET_SET(oso->so_vnet); 2736 so = sonewconn(oso, 0 2737 ); 2738 CURVNET_RESTORE(); 2739 SCTP_TCB_LOCK((*stcb)); 2740 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2741 2742 if (so == NULL) { 2743 struct mbuf *op_err; 2744 2745#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2746 struct socket *pcb_so; 2747 2748#endif 2749 /* Too many sockets */ 2750 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n"); 2751 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2752 sctp_abort_association(*inp_p, NULL, m, iphlen, 2753 src, dst, sh, op_err, 2754 use_mflowid, mflowid, 2755 vrf_id, port); 2756#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2757 pcb_so = SCTP_INP_SO(*inp_p); 2758 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2759 SCTP_TCB_UNLOCK((*stcb)); 2760 SCTP_SOCKET_LOCK(pcb_so, 1); 2761 SCTP_TCB_LOCK((*stcb)); 2762 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2763#endif 2764 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_20); 2765#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2766 SCTP_SOCKET_UNLOCK(pcb_so, 1); 2767#endif 2768 return (NULL); 2769 } 2770 inp = (struct sctp_inpcb *)so->so_pcb; 2771 SCTP_INP_INCR_REF(inp); 2772 /* 2773 * We add the unbound flag here so that if we get an 2774 * soabort() before we get the move_pcb done, we 2775 * will properly cleanup. 2776 */ 2777 inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE | 2778 SCTP_PCB_FLAGS_CONNECTED | 2779 SCTP_PCB_FLAGS_IN_TCPPOOL | 2780 SCTP_PCB_FLAGS_UNBOUND | 2781 (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) | 2782 SCTP_PCB_FLAGS_DONT_WAKE); 2783 inp->sctp_features = (*inp_p)->sctp_features; 2784 inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features; 2785 inp->sctp_socket = so; 2786 inp->sctp_frag_point = (*inp_p)->sctp_frag_point; 2787 inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off; 2788 inp->sctp_ecn_enable = (*inp_p)->sctp_ecn_enable; 2789 inp->partial_delivery_point = (*inp_p)->partial_delivery_point; 2790 inp->sctp_context = (*inp_p)->sctp_context; 2791 inp->local_strreset_support = (*inp_p)->local_strreset_support; 2792 inp->inp_starting_point_for_iterator = NULL; 2793 /* 2794 * copy in the authentication parameters from the 2795 * original endpoint 2796 */ 2797 if (inp->sctp_ep.local_hmacs) 2798 sctp_free_hmaclist(inp->sctp_ep.local_hmacs); 2799 inp->sctp_ep.local_hmacs = 2800 sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs); 2801 if (inp->sctp_ep.local_auth_chunks) 2802 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks); 2803 inp->sctp_ep.local_auth_chunks = 2804 sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks); 2805 2806 /* 2807 * Now we must move it from one hash table to 2808 * another and get the tcb in the right place. 2809 */ 2810 2811 /* 2812 * This is where the one-2-one socket is put into 2813 * the accept state waiting for the accept! 2814 */ 2815 if (*stcb) { 2816 (*stcb)->asoc.state |= SCTP_STATE_IN_ACCEPT_QUEUE; 2817 } 2818 sctp_move_pcb_and_assoc(*inp_p, inp, *stcb); 2819 2820 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2821 SCTP_TCB_UNLOCK((*stcb)); 2822 2823 sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb, 2824 0); 2825 SCTP_TCB_LOCK((*stcb)); 2826 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2827 2828 2829 /* 2830 * now we must check to see if we were aborted while 2831 * the move was going on and the lock/unlock 2832 * happened. 2833 */ 2834 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 2835 /* 2836 * yep it was, we leave the assoc attached 2837 * to the socket since the sctp_inpcb_free() 2838 * call will send an abort for us. 2839 */ 2840 SCTP_INP_DECR_REF(inp); 2841 return (NULL); 2842 } 2843 SCTP_INP_DECR_REF(inp); 2844 /* Switch over to the new guy */ 2845 *inp_p = inp; 2846 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2847 if (send_int_conf) { 2848 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2849 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2850 } 2851 /* 2852 * Pull it from the incomplete queue and wake the 2853 * guy 2854 */ 2855#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2856 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2857 SCTP_TCB_UNLOCK((*stcb)); 2858 SCTP_SOCKET_LOCK(so, 1); 2859#endif 2860 soisconnected(so); 2861#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2862 SCTP_TCB_LOCK((*stcb)); 2863 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2864 SCTP_SOCKET_UNLOCK(so, 1); 2865#endif 2866 return (m); 2867 } 2868 } 2869 if (notification) { 2870 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2871 } 2872 if (send_int_conf) { 2873 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2874 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2875 } 2876 return (m); 2877} 2878 2879static void 2880sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED, 2881 struct sctp_tcb *stcb, struct sctp_nets *net) 2882{ 2883 /* cp must not be used, others call this without a c-ack :-) */ 2884 struct sctp_association *asoc; 2885 2886 SCTPDBG(SCTP_DEBUG_INPUT2, 2887 "sctp_handle_cookie_ack: handling COOKIE-ACK\n"); 2888 if (stcb == NULL) 2889 return; 2890 2891 asoc = &stcb->asoc; 2892 2893 sctp_stop_all_cookie_timers(stcb); 2894 /* process according to association state */ 2895 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) { 2896 /* state change only needed when I am in right state */ 2897 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2898 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 2899 sctp_start_net_timers(stcb); 2900 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2901 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2902 stcb->sctp_ep, stcb, asoc->primary_destination); 2903 2904 } 2905 /* update RTO */ 2906 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 2907 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2908 if (asoc->overall_error_count == 0) { 2909 net->RTO = sctp_calculate_rto(stcb, asoc, net, 2910 &asoc->time_entered, sctp_align_safe_nocopy, 2911 SCTP_RTT_FROM_NON_DATA); 2912 } 2913 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 2914 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2915 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2916 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 2917#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2918 struct socket *so; 2919 2920#endif 2921 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2922#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2923 so = SCTP_INP_SO(stcb->sctp_ep); 2924 atomic_add_int(&stcb->asoc.refcnt, 1); 2925 SCTP_TCB_UNLOCK(stcb); 2926 SCTP_SOCKET_LOCK(so, 1); 2927 SCTP_TCB_LOCK(stcb); 2928 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2929#endif 2930 if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) { 2931 soisconnected(stcb->sctp_socket); 2932 } 2933#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2934 SCTP_SOCKET_UNLOCK(so, 1); 2935#endif 2936 } 2937 /* 2938 * since we did not send a HB make sure we don't double 2939 * things 2940 */ 2941 net->hb_responded = 1; 2942 2943 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2944 /* 2945 * We don't need to do the asconf thing, nor hb or 2946 * autoclose if the socket is closed. 2947 */ 2948 goto closed_socket; 2949 } 2950 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 2951 stcb, net); 2952 2953 2954 if (stcb->asoc.sctp_autoclose_ticks && 2955 sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2956 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 2957 stcb->sctp_ep, stcb, NULL); 2958 } 2959 /* 2960 * send ASCONF if parameters are pending and ASCONFs are 2961 * allowed (eg. addresses changed when init/cookie echo were 2962 * in flight) 2963 */ 2964 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) && 2965 (stcb->asoc.peer_supports_asconf) && 2966 (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) { 2967#ifdef SCTP_TIMER_BASED_ASCONF 2968 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, 2969 stcb->sctp_ep, stcb, 2970 stcb->asoc.primary_destination); 2971#else 2972 sctp_send_asconf(stcb, stcb->asoc.primary_destination, 2973 SCTP_ADDR_NOT_LOCKED); 2974#endif 2975 } 2976 } 2977closed_socket: 2978 /* Toss the cookie if I can */ 2979 sctp_toss_old_cookies(stcb, asoc); 2980 if (!TAILQ_EMPTY(&asoc->sent_queue)) { 2981 /* Restart the timer if we have pending data */ 2982 struct sctp_tmit_chunk *chk; 2983 2984 chk = TAILQ_FIRST(&asoc->sent_queue); 2985 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 2986 } 2987} 2988 2989static void 2990sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp, 2991 struct sctp_tcb *stcb) 2992{ 2993 struct sctp_nets *net; 2994 struct sctp_tmit_chunk *lchk; 2995 struct sctp_ecne_chunk bkup; 2996 uint8_t override_bit; 2997 uint32_t tsn, window_data_tsn; 2998 int len; 2999 unsigned int pkt_cnt; 3000 3001 len = ntohs(cp->ch.chunk_length); 3002 if ((len != sizeof(struct sctp_ecne_chunk)) && 3003 (len != sizeof(struct old_sctp_ecne_chunk))) { 3004 return; 3005 } 3006 if (len == sizeof(struct old_sctp_ecne_chunk)) { 3007 /* Its the old format */ 3008 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk)); 3009 bkup.num_pkts_since_cwr = htonl(1); 3010 cp = &bkup; 3011 } 3012 SCTP_STAT_INCR(sctps_recvecne); 3013 tsn = ntohl(cp->tsn); 3014 pkt_cnt = ntohl(cp->num_pkts_since_cwr); 3015 lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead); 3016 if (lchk == NULL) { 3017 window_data_tsn = stcb->asoc.sending_seq - 1; 3018 } else { 3019 window_data_tsn = lchk->rec.data.TSN_seq; 3020 } 3021 3022 /* Find where it was sent to if possible. */ 3023 net = NULL; 3024 TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) { 3025 if (lchk->rec.data.TSN_seq == tsn) { 3026 net = lchk->whoTo; 3027 net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send; 3028 break; 3029 } 3030 if (SCTP_TSN_GT(lchk->rec.data.TSN_seq, tsn)) { 3031 break; 3032 } 3033 } 3034 if (net == NULL) { 3035 /* 3036 * What to do. A previous send of a CWR was possibly lost. 3037 * See how old it is, we may have it marked on the actual 3038 * net. 3039 */ 3040 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 3041 if (tsn == net->last_cwr_tsn) { 3042 /* Found him, send it off */ 3043 break; 3044 } 3045 } 3046 if (net == NULL) { 3047 /* 3048 * If we reach here, we need to send a special CWR 3049 * that says hey, we did this a long time ago and 3050 * you lost the response. 3051 */ 3052 net = TAILQ_FIRST(&stcb->asoc.nets); 3053 if (net == NULL) { 3054 /* TSNH */ 3055 return; 3056 } 3057 override_bit = SCTP_CWR_REDUCE_OVERRIDE; 3058 } else { 3059 override_bit = 0; 3060 } 3061 } else { 3062 override_bit = 0; 3063 } 3064 if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) && 3065 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 3066 /* 3067 * JRS - Use the congestion control given in the pluggable 3068 * CC module 3069 */ 3070 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt); 3071 /* 3072 * We reduce once every RTT. So we will only lower cwnd at 3073 * the next sending seq i.e. the window_data_tsn 3074 */ 3075 net->cwr_window_tsn = window_data_tsn; 3076 net->ecn_ce_pkt_cnt += pkt_cnt; 3077 net->lost_cnt = pkt_cnt; 3078 net->last_cwr_tsn = tsn; 3079 } else { 3080 override_bit |= SCTP_CWR_IN_SAME_WINDOW; 3081 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) && 3082 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 3083 /* 3084 * Another loss in the same window update how many 3085 * marks/packets lost we have had. 3086 */ 3087 int cnt = 1; 3088 3089 if (pkt_cnt > net->lost_cnt) { 3090 /* Should be the case */ 3091 cnt = (pkt_cnt - net->lost_cnt); 3092 net->ecn_ce_pkt_cnt += cnt; 3093 } 3094 net->lost_cnt = pkt_cnt; 3095 net->last_cwr_tsn = tsn; 3096 /* 3097 * Most CC functions will ignore this call, since we 3098 * are in-window yet of the initial CE the peer saw. 3099 */ 3100 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt); 3101 } 3102 } 3103 /* 3104 * We always send a CWR this way if our previous one was lost our 3105 * peer will get an update, or if it is not time again to reduce we 3106 * still get the cwr to the peer. Note we set the override when we 3107 * could not find the TSN on the chunk or the destination network. 3108 */ 3109 sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit); 3110} 3111 3112static void 3113sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net) 3114{ 3115 /* 3116 * Here we get a CWR from the peer. We must look in the outqueue and 3117 * make sure that we have a covered ECNE in the control chunk part. 3118 * If so remove it. 3119 */ 3120 struct sctp_tmit_chunk *chk; 3121 struct sctp_ecne_chunk *ecne; 3122 int override; 3123 uint32_t cwr_tsn; 3124 3125 cwr_tsn = ntohl(cp->tsn); 3126 3127 override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE; 3128 TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) { 3129 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) { 3130 continue; 3131 } 3132 if ((override == 0) && (chk->whoTo != net)) { 3133 /* Must be from the right src unless override is set */ 3134 continue; 3135 } 3136 ecne = mtod(chk->data, struct sctp_ecne_chunk *); 3137 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) { 3138 /* this covers this ECNE, we can remove it */ 3139 stcb->asoc.ecn_echo_cnt_onq--; 3140 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, 3141 sctp_next); 3142 if (chk->data) { 3143 sctp_m_freem(chk->data); 3144 chk->data = NULL; 3145 } 3146 stcb->asoc.ctrl_queue_cnt--; 3147 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3148 if (override == 0) { 3149 break; 3150 } 3151 } 3152 } 3153} 3154 3155static void 3156sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED, 3157 struct sctp_tcb *stcb, struct sctp_nets *net) 3158{ 3159 struct sctp_association *asoc; 3160 3161#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3162 struct socket *so; 3163 3164#endif 3165 3166 SCTPDBG(SCTP_DEBUG_INPUT2, 3167 "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n"); 3168 if (stcb == NULL) 3169 return; 3170 3171 asoc = &stcb->asoc; 3172 /* process according to association state */ 3173 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 3174 /* unexpected SHUTDOWN-COMPLETE... so ignore... */ 3175 SCTPDBG(SCTP_DEBUG_INPUT2, 3176 "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n"); 3177 SCTP_TCB_UNLOCK(stcb); 3178 return; 3179 } 3180 /* notify upper layer protocol */ 3181 if (stcb->sctp_socket) { 3182 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 3183 } 3184#ifdef INVARIANTS 3185 if (!TAILQ_EMPTY(&asoc->send_queue) || 3186 !TAILQ_EMPTY(&asoc->sent_queue) || 3187 !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 3188 panic("Queues are not empty when handling SHUTDOWN-COMPLETE"); 3189 } 3190#endif 3191 /* stop the timer */ 3192 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_22); 3193 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 3194 /* free the TCB */ 3195 SCTPDBG(SCTP_DEBUG_INPUT2, 3196 "sctp_handle_shutdown_complete: calls free-asoc\n"); 3197#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3198 so = SCTP_INP_SO(stcb->sctp_ep); 3199 atomic_add_int(&stcb->asoc.refcnt, 1); 3200 SCTP_TCB_UNLOCK(stcb); 3201 SCTP_SOCKET_LOCK(so, 1); 3202 SCTP_TCB_LOCK(stcb); 3203 atomic_subtract_int(&stcb->asoc.refcnt, 1); 3204#endif 3205 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_23); 3206#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3207 SCTP_SOCKET_UNLOCK(so, 1); 3208#endif 3209 return; 3210} 3211 3212static int 3213process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc, 3214 struct sctp_nets *net, uint8_t flg) 3215{ 3216 switch (desc->chunk_type) { 3217 case SCTP_DATA: 3218 /* find the tsn to resend (possibly */ 3219 { 3220 uint32_t tsn; 3221 struct sctp_tmit_chunk *tp1; 3222 3223 tsn = ntohl(desc->tsn_ifany); 3224 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3225 if (tp1->rec.data.TSN_seq == tsn) { 3226 /* found it */ 3227 break; 3228 } 3229 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, tsn)) { 3230 /* not found */ 3231 tp1 = NULL; 3232 break; 3233 } 3234 } 3235 if (tp1 == NULL) { 3236 /* 3237 * Do it the other way , aka without paying 3238 * attention to queue seq order. 3239 */ 3240 SCTP_STAT_INCR(sctps_pdrpdnfnd); 3241 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3242 if (tp1->rec.data.TSN_seq == tsn) { 3243 /* found it */ 3244 break; 3245 } 3246 } 3247 } 3248 if (tp1 == NULL) { 3249 SCTP_STAT_INCR(sctps_pdrptsnnf); 3250 } 3251 if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) { 3252 uint8_t *ddp; 3253 3254 if (((flg & SCTP_BADCRC) == 0) && 3255 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3256 return (0); 3257 } 3258 if ((stcb->asoc.peers_rwnd == 0) && 3259 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3260 SCTP_STAT_INCR(sctps_pdrpdiwnp); 3261 return (0); 3262 } 3263 if (stcb->asoc.peers_rwnd == 0 && 3264 (flg & SCTP_FROM_MIDDLE_BOX)) { 3265 SCTP_STAT_INCR(sctps_pdrpdizrw); 3266 return (0); 3267 } 3268 ddp = (uint8_t *) (mtod(tp1->data, caddr_t)+ 3269 sizeof(struct sctp_data_chunk)); 3270 { 3271 unsigned int iii; 3272 3273 for (iii = 0; iii < sizeof(desc->data_bytes); 3274 iii++) { 3275 if (ddp[iii] != desc->data_bytes[iii]) { 3276 SCTP_STAT_INCR(sctps_pdrpbadd); 3277 return (-1); 3278 } 3279 } 3280 } 3281 3282 if (tp1->do_rtt) { 3283 /* 3284 * this guy had a RTO calculation 3285 * pending on it, cancel it 3286 */ 3287 if (tp1->whoTo->rto_needed == 0) { 3288 tp1->whoTo->rto_needed = 1; 3289 } 3290 tp1->do_rtt = 0; 3291 } 3292 SCTP_STAT_INCR(sctps_pdrpmark); 3293 if (tp1->sent != SCTP_DATAGRAM_RESEND) 3294 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3295 /* 3296 * mark it as if we were doing a FR, since 3297 * we will be getting gap ack reports behind 3298 * the info from the router. 3299 */ 3300 tp1->rec.data.doing_fast_retransmit = 1; 3301 /* 3302 * mark the tsn with what sequences can 3303 * cause a new FR. 3304 */ 3305 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) { 3306 tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq; 3307 } else { 3308 tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq; 3309 } 3310 3311 /* restart the timer */ 3312 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3313 stcb, tp1->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_24); 3314 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3315 stcb, tp1->whoTo); 3316 3317 /* fix counts and things */ 3318 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 3319 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP, 3320 tp1->whoTo->flight_size, 3321 tp1->book_size, 3322 (uintptr_t) stcb, 3323 tp1->rec.data.TSN_seq); 3324 } 3325 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3326 sctp_flight_size_decrease(tp1); 3327 sctp_total_flight_decrease(stcb, tp1); 3328 } 3329 tp1->sent = SCTP_DATAGRAM_RESEND; 3330 } { 3331 /* audit code */ 3332 unsigned int audit; 3333 3334 audit = 0; 3335 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3336 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3337 audit++; 3338 } 3339 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue, 3340 sctp_next) { 3341 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3342 audit++; 3343 } 3344 if (audit != stcb->asoc.sent_queue_retran_cnt) { 3345 SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n", 3346 audit, stcb->asoc.sent_queue_retran_cnt); 3347#ifndef SCTP_AUDITING_ENABLED 3348 stcb->asoc.sent_queue_retran_cnt = audit; 3349#endif 3350 } 3351 } 3352 } 3353 break; 3354 case SCTP_ASCONF: 3355 { 3356 struct sctp_tmit_chunk *asconf; 3357 3358 TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue, 3359 sctp_next) { 3360 if (asconf->rec.chunk_id.id == SCTP_ASCONF) { 3361 break; 3362 } 3363 } 3364 if (asconf) { 3365 if (asconf->sent != SCTP_DATAGRAM_RESEND) 3366 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3367 asconf->sent = SCTP_DATAGRAM_RESEND; 3368 asconf->snd_count--; 3369 } 3370 } 3371 break; 3372 case SCTP_INITIATION: 3373 /* resend the INIT */ 3374 stcb->asoc.dropped_special_cnt++; 3375 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) { 3376 /* 3377 * If we can get it in, in a few attempts we do 3378 * this, otherwise we let the timer fire. 3379 */ 3380 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, 3381 stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_25); 3382 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 3383 } 3384 break; 3385 case SCTP_SELECTIVE_ACK: 3386 case SCTP_NR_SELECTIVE_ACK: 3387 /* resend the sack */ 3388 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED); 3389 break; 3390 case SCTP_HEARTBEAT_REQUEST: 3391 /* resend a demand HB */ 3392 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) { 3393 /* 3394 * Only retransmit if we KNOW we wont destroy the 3395 * tcb 3396 */ 3397 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 3398 } 3399 break; 3400 case SCTP_SHUTDOWN: 3401 sctp_send_shutdown(stcb, net); 3402 break; 3403 case SCTP_SHUTDOWN_ACK: 3404 sctp_send_shutdown_ack(stcb, net); 3405 break; 3406 case SCTP_COOKIE_ECHO: 3407 { 3408 struct sctp_tmit_chunk *cookie; 3409 3410 cookie = NULL; 3411 TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, 3412 sctp_next) { 3413 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) { 3414 break; 3415 } 3416 } 3417 if (cookie) { 3418 if (cookie->sent != SCTP_DATAGRAM_RESEND) 3419 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3420 cookie->sent = SCTP_DATAGRAM_RESEND; 3421 sctp_stop_all_cookie_timers(stcb); 3422 } 3423 } 3424 break; 3425 case SCTP_COOKIE_ACK: 3426 sctp_send_cookie_ack(stcb); 3427 break; 3428 case SCTP_ASCONF_ACK: 3429 /* resend last asconf ack */ 3430 sctp_send_asconf_ack(stcb); 3431 break; 3432 case SCTP_FORWARD_CUM_TSN: 3433 send_forward_tsn(stcb, &stcb->asoc); 3434 break; 3435 /* can't do anything with these */ 3436 case SCTP_PACKET_DROPPED: 3437 case SCTP_INITIATION_ACK: /* this should not happen */ 3438 case SCTP_HEARTBEAT_ACK: 3439 case SCTP_ABORT_ASSOCIATION: 3440 case SCTP_OPERATION_ERROR: 3441 case SCTP_SHUTDOWN_COMPLETE: 3442 case SCTP_ECN_ECHO: 3443 case SCTP_ECN_CWR: 3444 default: 3445 break; 3446 } 3447 return (0); 3448} 3449 3450void 3451sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list) 3452{ 3453 uint32_t i; 3454 uint16_t temp; 3455 3456 /* 3457 * We set things to 0xffff since this is the last delivered sequence 3458 * and we will be sending in 0 after the reset. 3459 */ 3460 3461 if (number_entries) { 3462 for (i = 0; i < number_entries; i++) { 3463 temp = ntohs(list[i]); 3464 if (temp >= stcb->asoc.streamincnt) { 3465 continue; 3466 } 3467 stcb->asoc.strmin[temp].last_sequence_delivered = 0xffff; 3468 } 3469 } else { 3470 list = NULL; 3471 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3472 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff; 3473 } 3474 } 3475 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3476} 3477 3478static void 3479sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list) 3480{ 3481 uint32_t i; 3482 uint16_t temp; 3483 3484 if (number_entries > 0) { 3485 for (i = 0; i < number_entries; i++) { 3486 temp = ntohs(list[i]); 3487 if (temp >= stcb->asoc.streamoutcnt) { 3488 /* no such stream */ 3489 continue; 3490 } 3491 stcb->asoc.strmout[temp].next_sequence_send = 0; 3492 } 3493 } else { 3494 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3495 stcb->asoc.strmout[i].next_sequence_send = 0; 3496 } 3497 } 3498 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3499} 3500 3501 3502struct sctp_stream_reset_out_request * 3503sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk) 3504{ 3505 struct sctp_association *asoc; 3506 struct sctp_chunkhdr *ch; 3507 struct sctp_stream_reset_out_request *r; 3508 struct sctp_tmit_chunk *chk; 3509 int len, clen; 3510 3511 asoc = &stcb->asoc; 3512 if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 3513 asoc->stream_reset_outstanding = 0; 3514 return (NULL); 3515 } 3516 if (stcb->asoc.str_reset == NULL) { 3517 asoc->stream_reset_outstanding = 0; 3518 return (NULL); 3519 } 3520 chk = stcb->asoc.str_reset; 3521 if (chk->data == NULL) { 3522 return (NULL); 3523 } 3524 if (bchk) { 3525 /* he wants a copy of the chk pointer */ 3526 *bchk = chk; 3527 } 3528 clen = chk->send_size; 3529 ch = mtod(chk->data, struct sctp_chunkhdr *); 3530 r = (struct sctp_stream_reset_out_request *)(ch + 1); 3531 if (ntohl(r->request_seq) == seq) { 3532 /* found it */ 3533 return (r); 3534 } 3535 len = SCTP_SIZE32(ntohs(r->ph.param_length)); 3536 if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) { 3537 /* move to the next one, there can only be a max of two */ 3538 r = (struct sctp_stream_reset_out_request *)((caddr_t)r + len); 3539 if (ntohl(r->request_seq) == seq) { 3540 return (r); 3541 } 3542 } 3543 /* that seq is not here */ 3544 return (NULL); 3545} 3546 3547static void 3548sctp_clean_up_stream_reset(struct sctp_tcb *stcb) 3549{ 3550 struct sctp_association *asoc; 3551 struct sctp_tmit_chunk *chk = stcb->asoc.str_reset; 3552 3553 if (stcb->asoc.str_reset == NULL) { 3554 return; 3555 } 3556 asoc = &stcb->asoc; 3557 3558 sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_26); 3559 TAILQ_REMOVE(&asoc->control_send_queue, 3560 chk, 3561 sctp_next); 3562 if (chk->data) { 3563 sctp_m_freem(chk->data); 3564 chk->data = NULL; 3565 } 3566 asoc->ctrl_queue_cnt--; 3567 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3568 /* sa_ignore NO_NULL_CHK */ 3569 stcb->asoc.str_reset = NULL; 3570} 3571 3572 3573static int 3574sctp_handle_stream_reset_response(struct sctp_tcb *stcb, 3575 uint32_t seq, uint32_t action, 3576 struct sctp_stream_reset_response *respin) 3577{ 3578 uint16_t type; 3579 int lparm_len; 3580 struct sctp_association *asoc = &stcb->asoc; 3581 struct sctp_tmit_chunk *chk; 3582 struct sctp_stream_reset_out_request *srparam; 3583 uint32_t number_entries; 3584 3585 if (asoc->stream_reset_outstanding == 0) { 3586 /* duplicate */ 3587 return (0); 3588 } 3589 if (seq == stcb->asoc.str_reset_seq_out) { 3590 srparam = sctp_find_stream_reset(stcb, seq, &chk); 3591 if (srparam) { 3592 stcb->asoc.str_reset_seq_out++; 3593 type = ntohs(srparam->ph.param_type); 3594 lparm_len = ntohs(srparam->ph.param_length); 3595 if (type == SCTP_STR_RESET_OUT_REQUEST) { 3596 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t); 3597 asoc->stream_reset_out_is_outstanding = 0; 3598 if (asoc->stream_reset_outstanding) 3599 asoc->stream_reset_outstanding--; 3600 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3601 /* do it */ 3602 sctp_reset_out_streams(stcb, number_entries, srparam->list_of_streams); 3603 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3604 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED); 3605 } else { 3606 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED); 3607 } 3608 } else if (type == SCTP_STR_RESET_IN_REQUEST) { 3609 /* Answered my request */ 3610 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t); 3611 if (asoc->stream_reset_outstanding) 3612 asoc->stream_reset_outstanding--; 3613 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3614 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb, 3615 number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED); 3616 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3617 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb, 3618 number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED); 3619 } 3620 } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) { 3621 /* Ok we now may have more streams */ 3622 int num_stream; 3623 3624 num_stream = stcb->asoc.strm_pending_add_size; 3625 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) { 3626 /* TSNH */ 3627 num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt; 3628 } 3629 stcb->asoc.strm_pending_add_size = 0; 3630 if (asoc->stream_reset_outstanding) 3631 asoc->stream_reset_outstanding--; 3632 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3633 /* Put the new streams into effect */ 3634 stcb->asoc.streamoutcnt += num_stream; 3635 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 3636 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3637 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3638 SCTP_STREAM_CHANGE_DENIED); 3639 } else { 3640 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3641 SCTP_STREAM_CHANGE_FAILED); 3642 } 3643 } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) { 3644 if (asoc->stream_reset_outstanding) 3645 asoc->stream_reset_outstanding--; 3646 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3647 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3648 SCTP_STREAM_CHANGE_DENIED); 3649 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3650 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3651 SCTP_STREAM_CHANGE_FAILED); 3652 } 3653 } else if (type == SCTP_STR_RESET_TSN_REQUEST) { 3654 /** 3655 * a) Adopt the new in tsn. 3656 * b) reset the map 3657 * c) Adopt the new out-tsn 3658 */ 3659 struct sctp_stream_reset_response_tsn *resp; 3660 struct sctp_forward_tsn_chunk fwdtsn; 3661 int abort_flag = 0; 3662 3663 if (respin == NULL) { 3664 /* huh ? */ 3665 return (0); 3666 } 3667 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3668 resp = (struct sctp_stream_reset_response_tsn *)respin; 3669 asoc->stream_reset_outstanding--; 3670 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3671 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3672 fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1); 3673 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3674 if (abort_flag) { 3675 return (1); 3676 } 3677 stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1); 3678 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3679 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3680 } 3681 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 3682 stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn); 3683 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 3684 3685 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map; 3686 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size); 3687 3688 stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn); 3689 stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn; 3690 3691 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL); 3692 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL); 3693 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0); 3694 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3695 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3696 SCTP_ASSOC_RESET_DENIED); 3697 } else { 3698 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3699 SCTP_ASSOC_RESET_FAILED); 3700 } 3701 } 3702 /* get rid of the request and get the request flags */ 3703 if (asoc->stream_reset_outstanding == 0) { 3704 sctp_clean_up_stream_reset(stcb); 3705 } 3706 } 3707 } 3708 return (0); 3709} 3710 3711static void 3712sctp_handle_str_reset_request_in(struct sctp_tcb *stcb, 3713 struct sctp_tmit_chunk *chk, 3714 struct sctp_stream_reset_in_request *req, int trunc) 3715{ 3716 uint32_t seq; 3717 int len, i; 3718 int number_entries; 3719 uint16_t temp; 3720 3721 /* 3722 * peer wants me to send a str-reset to him for my outgoing seq's if 3723 * seq_in is right. 3724 */ 3725 struct sctp_association *asoc = &stcb->asoc; 3726 3727 seq = ntohl(req->request_seq); 3728 if (asoc->str_reset_seq_in == seq) { 3729 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3730 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3731 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3732 } else if (trunc) { 3733 /* Can't do it, since they exceeded our buffer size */ 3734 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3735 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) { 3736 len = ntohs(req->ph.param_length); 3737 number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t)); 3738 for (i = 0; i < number_entries; i++) { 3739 temp = ntohs(req->list_of_streams[i]); 3740 req->list_of_streams[i] = temp; 3741 } 3742 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3743 sctp_add_stream_reset_out(chk, number_entries, req->list_of_streams, 3744 asoc->str_reset_seq_out, 3745 seq, (asoc->sending_seq - 1)); 3746 asoc->stream_reset_out_is_outstanding = 1; 3747 asoc->str_reset = chk; 3748 sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo); 3749 stcb->asoc.stream_reset_outstanding++; 3750 } else { 3751 /* Can't do it, since we have sent one out */ 3752 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 3753 } 3754 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3755 asoc->str_reset_seq_in++; 3756 } else if (asoc->str_reset_seq_in - 1 == seq) { 3757 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3758 } else if (asoc->str_reset_seq_in - 2 == seq) { 3759 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3760 } else { 3761 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3762 } 3763} 3764 3765static int 3766sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb, 3767 struct sctp_tmit_chunk *chk, 3768 struct sctp_stream_reset_tsn_request *req) 3769{ 3770 /* reset all in and out and update the tsn */ 3771 /* 3772 * A) reset my str-seq's on in and out. B) Select a receive next, 3773 * and set cum-ack to it. Also process this selected number as a 3774 * fwd-tsn as well. C) set in the response my next sending seq. 3775 */ 3776 struct sctp_forward_tsn_chunk fwdtsn; 3777 struct sctp_association *asoc = &stcb->asoc; 3778 int abort_flag = 0; 3779 uint32_t seq; 3780 3781 seq = ntohl(req->request_seq); 3782 if (asoc->str_reset_seq_in == seq) { 3783 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3784 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 3785 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3786 } else { 3787 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3788 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3789 fwdtsn.ch.chunk_flags = 0; 3790 fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1); 3791 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3792 if (abort_flag) { 3793 return (1); 3794 } 3795 asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA; 3796 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3797 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3798 } 3799 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map; 3800 asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1; 3801 memset(asoc->mapping_array, 0, asoc->mapping_array_size); 3802 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 3803 memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size); 3804 atomic_add_int(&asoc->sending_seq, 1); 3805 /* save off historical data for retrans */ 3806 asoc->last_sending_seq[1] = asoc->last_sending_seq[0]; 3807 asoc->last_sending_seq[0] = asoc->sending_seq; 3808 asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0]; 3809 asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn; 3810 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL); 3811 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL); 3812 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3813 sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0); 3814 } 3815 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3816 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3817 asoc->str_reset_seq_in++; 3818 } else if (asoc->str_reset_seq_in - 1 == seq) { 3819 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3820 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3821 } else if (asoc->str_reset_seq_in - 2 == seq) { 3822 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1], 3823 asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]); 3824 } else { 3825 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3826 } 3827 return (0); 3828} 3829 3830static void 3831sctp_handle_str_reset_request_out(struct sctp_tcb *stcb, 3832 struct sctp_tmit_chunk *chk, 3833 struct sctp_stream_reset_out_request *req, int trunc) 3834{ 3835 uint32_t seq, tsn; 3836 int number_entries, len; 3837 struct sctp_association *asoc = &stcb->asoc; 3838 3839 seq = ntohl(req->request_seq); 3840 3841 /* now if its not a duplicate we process it */ 3842 if (asoc->str_reset_seq_in == seq) { 3843 len = ntohs(req->ph.param_length); 3844 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t)); 3845 /* 3846 * the sender is resetting, handle the list issue.. we must 3847 * a) verify if we can do the reset, if so no problem b) If 3848 * we can't do the reset we must copy the request. c) queue 3849 * it, and setup the data in processor to trigger it off 3850 * when needed and dequeue all the queued data. 3851 */ 3852 tsn = ntohl(req->send_reset_at_tsn); 3853 3854 /* move the reset action back one */ 3855 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3856 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3857 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3858 } else if (trunc) { 3859 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3860 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) { 3861 /* we can do it now */ 3862 sctp_reset_in_stream(stcb, number_entries, req->list_of_streams); 3863 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3864 } else { 3865 /* 3866 * we must queue it up and thus wait for the TSN's 3867 * to arrive that are at or before tsn 3868 */ 3869 struct sctp_stream_reset_list *liste; 3870 int siz; 3871 3872 siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t)); 3873 SCTP_MALLOC(liste, struct sctp_stream_reset_list *, 3874 siz, SCTP_M_STRESET); 3875 if (liste == NULL) { 3876 /* gak out of memory */ 3877 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3878 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3879 return; 3880 } 3881 liste->tsn = tsn; 3882 liste->number_entries = number_entries; 3883 memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t)); 3884 TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp); 3885 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3886 } 3887 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3888 asoc->str_reset_seq_in++; 3889 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3890 /* 3891 * one 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[0]); 3895 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3896 /* 3897 * two seq back, just echo back last action since my 3898 * response was lost. 3899 */ 3900 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3901 } else { 3902 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3903 } 3904} 3905 3906static void 3907sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 3908 struct sctp_stream_reset_add_strm *str_add) 3909{ 3910 /* 3911 * Peer is requesting to add more streams. If its within our 3912 * max-streams we will allow it. 3913 */ 3914 uint32_t num_stream, i; 3915 uint32_t seq; 3916 struct sctp_association *asoc = &stcb->asoc; 3917 struct sctp_queued_to_read *ctl, *nctl; 3918 3919 /* Get the number. */ 3920 seq = ntohl(str_add->request_seq); 3921 num_stream = ntohs(str_add->number_of_streams); 3922 /* Now what would be the new total? */ 3923 if (asoc->str_reset_seq_in == seq) { 3924 num_stream += stcb->asoc.streamincnt; 3925 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3926 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 3927 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3928 } else if ((num_stream > stcb->asoc.max_inbound_streams) || 3929 (num_stream > 0xffff)) { 3930 /* We must reject it they ask for to many */ 3931 denied: 3932 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3933 } else { 3934 /* Ok, we can do that :-) */ 3935 struct sctp_stream_in *oldstrm; 3936 3937 /* save off the old */ 3938 oldstrm = stcb->asoc.strmin; 3939 SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *, 3940 (num_stream * sizeof(struct sctp_stream_in)), 3941 SCTP_M_STRMI); 3942 if (stcb->asoc.strmin == NULL) { 3943 stcb->asoc.strmin = oldstrm; 3944 goto denied; 3945 } 3946 /* copy off the old data */ 3947 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3948 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 3949 stcb->asoc.strmin[i].stream_no = i; 3950 stcb->asoc.strmin[i].last_sequence_delivered = oldstrm[i].last_sequence_delivered; 3951 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started; 3952 /* now anything on those queues? */ 3953 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next, nctl) { 3954 TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next); 3955 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next); 3956 } 3957 } 3958 /* Init the new streams */ 3959 for (i = stcb->asoc.streamincnt; i < num_stream; i++) { 3960 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 3961 stcb->asoc.strmin[i].stream_no = i; 3962 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff; 3963 stcb->asoc.strmin[i].delivery_started = 0; 3964 } 3965 SCTP_FREE(oldstrm, SCTP_M_STRMI); 3966 /* update the size */ 3967 stcb->asoc.streamincnt = num_stream; 3968 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3969 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 3970 } 3971 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3972 asoc->str_reset_seq_in++; 3973 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3974 /* 3975 * one 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[0]); 3979 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3980 /* 3981 * two seq back, just echo back last action since my 3982 * response was lost. 3983 */ 3984 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3985 } else { 3986 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3987 3988 } 3989} 3990 3991static void 3992sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 3993 struct sctp_stream_reset_add_strm *str_add) 3994{ 3995 /* 3996 * Peer is requesting to add more streams. If its within our 3997 * max-streams we will allow it. 3998 */ 3999 uint16_t num_stream; 4000 uint32_t seq; 4001 struct sctp_association *asoc = &stcb->asoc; 4002 4003 /* Get the number. */ 4004 seq = ntohl(str_add->request_seq); 4005 num_stream = ntohs(str_add->number_of_streams); 4006 /* Now what would be the new total? */ 4007 if (asoc->str_reset_seq_in == seq) { 4008 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 4009 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 4010 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4011 } else if (stcb->asoc.stream_reset_outstanding) { 4012 /* We must reject it we have something pending */ 4013 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 4014 } else { 4015 /* Ok, we can do that :-) */ 4016 int mychk; 4017 4018 mychk = stcb->asoc.streamoutcnt; 4019 mychk += num_stream; 4020 if (mychk < 0x10000) { 4021 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 4022 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 0, 1, num_stream, 0, 1)) { 4023 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4024 } 4025 } else { 4026 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4027 } 4028 } 4029 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]); 4030 asoc->str_reset_seq_in++; 4031 } else if ((asoc->str_reset_seq_in - 1) == seq) { 4032 /* 4033 * one 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[0]); 4037 } else if ((asoc->str_reset_seq_in - 2) == seq) { 4038 /* 4039 * two seq back, just echo back last action since my 4040 * response was lost. 4041 */ 4042 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 4043 } else { 4044 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 4045 } 4046} 4047 4048#ifdef __GNUC__ 4049__attribute__((noinline)) 4050#endif 4051 static int 4052 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset, 4053 struct sctp_chunkhdr *ch_req) 4054{ 4055 int chk_length, param_len, ptype; 4056 struct sctp_paramhdr pstore; 4057 uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE]; 4058 uint32_t seq = 0; 4059 int num_req = 0; 4060 int trunc = 0; 4061 struct sctp_tmit_chunk *chk; 4062 struct sctp_chunkhdr *ch; 4063 struct sctp_paramhdr *ph; 4064 int ret_code = 0; 4065 int num_param = 0; 4066 4067 /* now it may be a reset or a reset-response */ 4068 chk_length = ntohs(ch_req->chunk_length); 4069 4070 /* setup for adding the response */ 4071 sctp_alloc_a_chunk(stcb, chk); 4072 if (chk == NULL) { 4073 return (ret_code); 4074 } 4075 chk->rec.chunk_id.id = SCTP_STREAM_RESET; 4076 chk->rec.chunk_id.can_take_data = 0; 4077 chk->asoc = &stcb->asoc; 4078 chk->no_fr_allowed = 0; 4079 chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr); 4080 chk->book_size_scale = 0; 4081 chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA); 4082 if (chk->data == NULL) { 4083strres_nochunk: 4084 if (chk->data) { 4085 sctp_m_freem(chk->data); 4086 chk->data = NULL; 4087 } 4088 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 4089 return (ret_code); 4090 } 4091 SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD); 4092 4093 /* setup chunk parameters */ 4094 chk->sent = SCTP_DATAGRAM_UNSENT; 4095 chk->snd_count = 0; 4096 chk->whoTo = NULL; 4097 4098 ch = mtod(chk->data, struct sctp_chunkhdr *); 4099 ch->chunk_type = SCTP_STREAM_RESET; 4100 ch->chunk_flags = 0; 4101 ch->chunk_length = htons(chk->send_size); 4102 SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size); 4103 offset += sizeof(struct sctp_chunkhdr); 4104 while ((size_t)chk_length >= sizeof(struct sctp_stream_reset_tsn_request)) { 4105 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *) & pstore); 4106 if (ph == NULL) 4107 break; 4108 param_len = ntohs(ph->param_length); 4109 if (param_len < (int)sizeof(struct sctp_stream_reset_tsn_request)) { 4110 /* bad param */ 4111 break; 4112 } 4113 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, (int)sizeof(cstore)), 4114 (uint8_t *) & cstore); 4115 ptype = ntohs(ph->param_type); 4116 num_param++; 4117 if (param_len > (int)sizeof(cstore)) { 4118 trunc = 1; 4119 } else { 4120 trunc = 0; 4121 } 4122 if (num_param > SCTP_MAX_RESET_PARAMS) { 4123 /* hit the max of parameters already sorry.. */ 4124 break; 4125 } 4126 if (ptype == SCTP_STR_RESET_OUT_REQUEST) { 4127 struct sctp_stream_reset_out_request *req_out; 4128 4129 req_out = (struct sctp_stream_reset_out_request *)ph; 4130 num_req++; 4131 if (stcb->asoc.stream_reset_outstanding) { 4132 seq = ntohl(req_out->response_seq); 4133 if (seq == stcb->asoc.str_reset_seq_out) { 4134 /* implicit ack */ 4135 (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL); 4136 } 4137 } 4138 sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc); 4139 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) { 4140 struct sctp_stream_reset_add_strm *str_add; 4141 4142 str_add = (struct sctp_stream_reset_add_strm *)ph; 4143 num_req++; 4144 sctp_handle_str_reset_add_strm(stcb, chk, str_add); 4145 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) { 4146 struct sctp_stream_reset_add_strm *str_add; 4147 4148 str_add = (struct sctp_stream_reset_add_strm *)ph; 4149 num_req++; 4150 sctp_handle_str_reset_add_out_strm(stcb, chk, str_add); 4151 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) { 4152 struct sctp_stream_reset_in_request *req_in; 4153 4154 num_req++; 4155 req_in = (struct sctp_stream_reset_in_request *)ph; 4156 sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc); 4157 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) { 4158 struct sctp_stream_reset_tsn_request *req_tsn; 4159 4160 num_req++; 4161 req_tsn = (struct sctp_stream_reset_tsn_request *)ph; 4162 if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) { 4163 ret_code = 1; 4164 goto strres_nochunk; 4165 } 4166 /* no more */ 4167 break; 4168 } else if (ptype == SCTP_STR_RESET_RESPONSE) { 4169 struct sctp_stream_reset_response *resp; 4170 uint32_t result; 4171 4172 resp = (struct sctp_stream_reset_response *)ph; 4173 seq = ntohl(resp->response_seq); 4174 result = ntohl(resp->result); 4175 if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) { 4176 ret_code = 1; 4177 goto strres_nochunk; 4178 } 4179 } else { 4180 break; 4181 } 4182 offset += SCTP_SIZE32(param_len); 4183 chk_length -= SCTP_SIZE32(param_len); 4184 } 4185 if (num_req == 0) { 4186 /* we have no response free the stuff */ 4187 goto strres_nochunk; 4188 } 4189 /* ok we have a chunk to link in */ 4190 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, 4191 chk, 4192 sctp_next); 4193 stcb->asoc.ctrl_queue_cnt++; 4194 return (ret_code); 4195} 4196 4197/* 4198 * Handle a router or endpoints report of a packet loss, there are two ways 4199 * to handle this, either we get the whole packet and must disect it 4200 * ourselves (possibly with truncation and or corruption) or it is a summary 4201 * from a middle box that did the disectting for us. 4202 */ 4203static void 4204sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp, 4205 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 4206{ 4207 uint32_t bottle_bw, on_queue; 4208 uint16_t trunc_len; 4209 unsigned int chlen; 4210 unsigned int at; 4211 struct sctp_chunk_desc desc; 4212 struct sctp_chunkhdr *ch; 4213 4214 chlen = ntohs(cp->ch.chunk_length); 4215 chlen -= sizeof(struct sctp_pktdrop_chunk); 4216 /* XXX possible chlen underflow */ 4217 if (chlen == 0) { 4218 ch = NULL; 4219 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) 4220 SCTP_STAT_INCR(sctps_pdrpbwrpt); 4221 } else { 4222 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr)); 4223 chlen -= sizeof(struct sctphdr); 4224 /* XXX possible chlen underflow */ 4225 memset(&desc, 0, sizeof(desc)); 4226 } 4227 trunc_len = (uint16_t) ntohs(cp->trunc_len); 4228 if (trunc_len > limit) { 4229 trunc_len = limit; 4230 } 4231 /* now the chunks themselves */ 4232 while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) { 4233 desc.chunk_type = ch->chunk_type; 4234 /* get amount we need to move */ 4235 at = ntohs(ch->chunk_length); 4236 if (at < sizeof(struct sctp_chunkhdr)) { 4237 /* corrupt chunk, maybe at the end? */ 4238 SCTP_STAT_INCR(sctps_pdrpcrupt); 4239 break; 4240 } 4241 if (trunc_len == 0) { 4242 /* we are supposed to have all of it */ 4243 if (at > chlen) { 4244 /* corrupt skip it */ 4245 SCTP_STAT_INCR(sctps_pdrpcrupt); 4246 break; 4247 } 4248 } else { 4249 /* is there enough of it left ? */ 4250 if (desc.chunk_type == SCTP_DATA) { 4251 if (chlen < (sizeof(struct sctp_data_chunk) + 4252 sizeof(desc.data_bytes))) { 4253 break; 4254 } 4255 } else { 4256 if (chlen < sizeof(struct sctp_chunkhdr)) { 4257 break; 4258 } 4259 } 4260 } 4261 if (desc.chunk_type == SCTP_DATA) { 4262 /* can we get out the tsn? */ 4263 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4264 SCTP_STAT_INCR(sctps_pdrpmbda); 4265 4266 if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) { 4267 /* yep */ 4268 struct sctp_data_chunk *dcp; 4269 uint8_t *ddp; 4270 unsigned int iii; 4271 4272 dcp = (struct sctp_data_chunk *)ch; 4273 ddp = (uint8_t *) (dcp + 1); 4274 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) { 4275 desc.data_bytes[iii] = ddp[iii]; 4276 } 4277 desc.tsn_ifany = dcp->dp.tsn; 4278 } else { 4279 /* nope we are done. */ 4280 SCTP_STAT_INCR(sctps_pdrpnedat); 4281 break; 4282 } 4283 } else { 4284 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4285 SCTP_STAT_INCR(sctps_pdrpmbct); 4286 } 4287 4288 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) { 4289 SCTP_STAT_INCR(sctps_pdrppdbrk); 4290 break; 4291 } 4292 if (SCTP_SIZE32(at) > chlen) { 4293 break; 4294 } 4295 chlen -= SCTP_SIZE32(at); 4296 if (chlen < sizeof(struct sctp_chunkhdr)) { 4297 /* done, none left */ 4298 break; 4299 } 4300 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at)); 4301 } 4302 /* Now update any rwnd --- possibly */ 4303 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) { 4304 /* From a peer, we get a rwnd report */ 4305 uint32_t a_rwnd; 4306 4307 SCTP_STAT_INCR(sctps_pdrpfehos); 4308 4309 bottle_bw = ntohl(cp->bottle_bw); 4310 on_queue = ntohl(cp->current_onq); 4311 if (bottle_bw && on_queue) { 4312 /* a rwnd report is in here */ 4313 if (bottle_bw > on_queue) 4314 a_rwnd = bottle_bw - on_queue; 4315 else 4316 a_rwnd = 0; 4317 4318 if (a_rwnd == 0) 4319 stcb->asoc.peers_rwnd = 0; 4320 else { 4321 if (a_rwnd > stcb->asoc.total_flight) { 4322 stcb->asoc.peers_rwnd = 4323 a_rwnd - stcb->asoc.total_flight; 4324 } else { 4325 stcb->asoc.peers_rwnd = 0; 4326 } 4327 if (stcb->asoc.peers_rwnd < 4328 stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 4329 /* SWS sender side engages */ 4330 stcb->asoc.peers_rwnd = 0; 4331 } 4332 } 4333 } 4334 } else { 4335 SCTP_STAT_INCR(sctps_pdrpfmbox); 4336 } 4337 4338 /* now middle boxes in sat networks get a cwnd bump */ 4339 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) && 4340 (stcb->asoc.sat_t3_loss_recovery == 0) && 4341 (stcb->asoc.sat_network)) { 4342 /* 4343 * This is debateable but for sat networks it makes sense 4344 * Note if a T3 timer has went off, we will prohibit any 4345 * changes to cwnd until we exit the t3 loss recovery. 4346 */ 4347 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb, 4348 net, cp, &bottle_bw, &on_queue); 4349 } 4350} 4351 4352/* 4353 * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to 4354 * still contain IP/SCTP header - stcb: is the tcb found for this packet - 4355 * offset: offset into the mbuf chain to first chunkhdr - length: is the 4356 * length of the complete packet outputs: - length: modified to remaining 4357 * length after control processing - netp: modified to new sctp_nets after 4358 * cookie-echo processing - return NULL to discard the packet (ie. no asoc, 4359 * bad packet,...) otherwise return the tcb for this packet 4360 */ 4361#ifdef __GNUC__ 4362__attribute__((noinline)) 4363#endif 4364 static struct sctp_tcb * 4365 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length, 4366 struct sockaddr *src, struct sockaddr *dst, 4367 struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp, 4368 struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen, 4369 uint8_t use_mflowid, uint32_t mflowid, 4370 uint32_t vrf_id, uint16_t port) 4371{ 4372 struct sctp_association *asoc; 4373 struct mbuf *op_err; 4374 char msg[SCTP_DIAG_INFO_LEN]; 4375 uint32_t vtag_in; 4376 int num_chunks = 0; /* number of control chunks processed */ 4377 uint32_t chk_length; 4378 int ret; 4379 int abort_no_unlock = 0; 4380 int ecne_seen = 0; 4381 4382 /* 4383 * How big should this be, and should it be alloc'd? Lets try the 4384 * d-mtu-ceiling for now (2k) and that should hopefully work ... 4385 * until we get into jumbo grams and such.. 4386 */ 4387 uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE]; 4388 struct sctp_tcb *locked_tcb = stcb; 4389 int got_auth = 0; 4390 uint32_t auth_offset = 0, auth_len = 0; 4391 int auth_skipped = 0; 4392 int asconf_cnt = 0; 4393 4394#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4395 struct socket *so; 4396 4397#endif 4398 4399 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n", 4400 iphlen, *offset, length, (void *)stcb); 4401 4402 /* validate chunk header length... */ 4403 if (ntohs(ch->chunk_length) < sizeof(*ch)) { 4404 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n", 4405 ntohs(ch->chunk_length)); 4406 if (locked_tcb) { 4407 SCTP_TCB_UNLOCK(locked_tcb); 4408 } 4409 return (NULL); 4410 } 4411 /* 4412 * validate the verification tag 4413 */ 4414 vtag_in = ntohl(sh->v_tag); 4415 4416 if (locked_tcb) { 4417 SCTP_TCB_LOCK_ASSERT(locked_tcb); 4418 } 4419 if (ch->chunk_type == SCTP_INITIATION) { 4420 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n", 4421 ntohs(ch->chunk_length), vtag_in); 4422 if (vtag_in != 0) { 4423 /* protocol error- silently discard... */ 4424 SCTP_STAT_INCR(sctps_badvtag); 4425 if (locked_tcb) { 4426 SCTP_TCB_UNLOCK(locked_tcb); 4427 } 4428 return (NULL); 4429 } 4430 } else if (ch->chunk_type != SCTP_COOKIE_ECHO) { 4431 /* 4432 * If there is no stcb, skip the AUTH chunk and process 4433 * later after a stcb is found (to validate the lookup was 4434 * valid. 4435 */ 4436 if ((ch->chunk_type == SCTP_AUTHENTICATION) && 4437 (stcb == NULL) && 4438 !SCTP_BASE_SYSCTL(sctp_auth_disable)) { 4439 /* save this chunk for later processing */ 4440 auth_skipped = 1; 4441 auth_offset = *offset; 4442 auth_len = ntohs(ch->chunk_length); 4443 4444 /* (temporarily) move past this chunk */ 4445 *offset += SCTP_SIZE32(auth_len); 4446 if (*offset >= length) { 4447 /* no more data left in the mbuf chain */ 4448 *offset = length; 4449 if (locked_tcb) { 4450 SCTP_TCB_UNLOCK(locked_tcb); 4451 } 4452 return (NULL); 4453 } 4454 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4455 sizeof(struct sctp_chunkhdr), chunk_buf); 4456 } 4457 if (ch == NULL) { 4458 /* Help */ 4459 *offset = length; 4460 if (locked_tcb) { 4461 SCTP_TCB_UNLOCK(locked_tcb); 4462 } 4463 return (NULL); 4464 } 4465 if (ch->chunk_type == SCTP_COOKIE_ECHO) { 4466 goto process_control_chunks; 4467 } 4468 /* 4469 * first check if it's an ASCONF with an unknown src addr we 4470 * need to look inside to find the association 4471 */ 4472 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) { 4473 struct sctp_chunkhdr *asconf_ch = ch; 4474 uint32_t asconf_offset = 0, asconf_len = 0; 4475 4476 /* inp's refcount may be reduced */ 4477 SCTP_INP_INCR_REF(inp); 4478 4479 asconf_offset = *offset; 4480 do { 4481 asconf_len = ntohs(asconf_ch->chunk_length); 4482 if (asconf_len < sizeof(struct sctp_asconf_paramhdr)) 4483 break; 4484 stcb = sctp_findassociation_ep_asconf(m, 4485 *offset, 4486 dst, 4487 sh, &inp, netp, vrf_id); 4488 if (stcb != NULL) 4489 break; 4490 asconf_offset += SCTP_SIZE32(asconf_len); 4491 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset, 4492 sizeof(struct sctp_chunkhdr), chunk_buf); 4493 } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF); 4494 if (stcb == NULL) { 4495 /* 4496 * reduce inp's refcount if not reduced in 4497 * sctp_findassociation_ep_asconf(). 4498 */ 4499 SCTP_INP_DECR_REF(inp); 4500 } else { 4501 locked_tcb = stcb; 4502 } 4503 4504 /* now go back and verify any auth chunk to be sure */ 4505 if (auth_skipped && (stcb != NULL)) { 4506 struct sctp_auth_chunk *auth; 4507 4508 auth = (struct sctp_auth_chunk *) 4509 sctp_m_getptr(m, auth_offset, 4510 auth_len, chunk_buf); 4511 got_auth = 1; 4512 auth_skipped = 0; 4513 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, 4514 auth_offset)) { 4515 /* auth HMAC failed so dump it */ 4516 *offset = length; 4517 if (locked_tcb) { 4518 SCTP_TCB_UNLOCK(locked_tcb); 4519 } 4520 return (NULL); 4521 } else { 4522 /* remaining chunks are HMAC checked */ 4523 stcb->asoc.authenticated = 1; 4524 } 4525 } 4526 } 4527 if (stcb == NULL) { 4528 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__); 4529 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4530 msg); 4531 /* no association, so it's out of the blue... */ 4532 sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, op_err, 4533 use_mflowid, mflowid, 4534 vrf_id, port); 4535 *offset = length; 4536 if (locked_tcb) { 4537 SCTP_TCB_UNLOCK(locked_tcb); 4538 } 4539 return (NULL); 4540 } 4541 asoc = &stcb->asoc; 4542 /* ABORT and SHUTDOWN can use either v_tag... */ 4543 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) || 4544 (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) || 4545 (ch->chunk_type == SCTP_PACKET_DROPPED)) { 4546 /* Take the T-bit always into account. */ 4547 if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) && 4548 (vtag_in == asoc->my_vtag)) || 4549 (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) && 4550 (vtag_in == asoc->peer_vtag))) { 4551 /* this is valid */ 4552 } else { 4553 /* drop this packet... */ 4554 SCTP_STAT_INCR(sctps_badvtag); 4555 if (locked_tcb) { 4556 SCTP_TCB_UNLOCK(locked_tcb); 4557 } 4558 return (NULL); 4559 } 4560 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 4561 if (vtag_in != asoc->my_vtag) { 4562 /* 4563 * this could be a stale SHUTDOWN-ACK or the 4564 * peer never got the SHUTDOWN-COMPLETE and 4565 * is still hung; we have started a new asoc 4566 * but it won't complete until the shutdown 4567 * is completed 4568 */ 4569 if (locked_tcb) { 4570 SCTP_TCB_UNLOCK(locked_tcb); 4571 } 4572 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__); 4573 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4574 msg); 4575 sctp_handle_ootb(m, iphlen, *offset, src, dst, 4576 sh, inp, op_err, 4577 use_mflowid, mflowid, 4578 vrf_id, port); 4579 return (NULL); 4580 } 4581 } else { 4582 /* for all other chunks, vtag must match */ 4583 if (vtag_in != asoc->my_vtag) { 4584 /* invalid vtag... */ 4585 SCTPDBG(SCTP_DEBUG_INPUT3, 4586 "invalid vtag: %xh, expect %xh\n", 4587 vtag_in, asoc->my_vtag); 4588 SCTP_STAT_INCR(sctps_badvtag); 4589 if (locked_tcb) { 4590 SCTP_TCB_UNLOCK(locked_tcb); 4591 } 4592 *offset = length; 4593 return (NULL); 4594 } 4595 } 4596 } /* end if !SCTP_COOKIE_ECHO */ 4597 /* 4598 * process all control chunks... 4599 */ 4600 if (((ch->chunk_type == SCTP_SELECTIVE_ACK) || 4601 (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) || 4602 (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) && 4603 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) { 4604 /* implied cookie-ack.. we must have lost the ack */ 4605 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4606 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4607 stcb->asoc.overall_error_count, 4608 0, 4609 SCTP_FROM_SCTP_INPUT, 4610 __LINE__); 4611 } 4612 stcb->asoc.overall_error_count = 0; 4613 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, 4614 *netp); 4615 } 4616process_control_chunks: 4617 while (IS_SCTP_CONTROL(ch)) { 4618 /* validate chunk length */ 4619 chk_length = ntohs(ch->chunk_length); 4620 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n", 4621 ch->chunk_type, chk_length); 4622 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length); 4623 if (chk_length < sizeof(*ch) || 4624 (*offset + (int)chk_length) > length) { 4625 *offset = length; 4626 if (locked_tcb) { 4627 SCTP_TCB_UNLOCK(locked_tcb); 4628 } 4629 return (NULL); 4630 } 4631 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks); 4632 /* 4633 * INIT-ACK only gets the init ack "header" portion only 4634 * because we don't have to process the peer's COOKIE. All 4635 * others get a complete chunk. 4636 */ 4637 if ((ch->chunk_type == SCTP_INITIATION_ACK) || 4638 (ch->chunk_type == SCTP_INITIATION)) { 4639 /* get an init-ack chunk */ 4640 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4641 sizeof(struct sctp_init_ack_chunk), chunk_buf); 4642 if (ch == NULL) { 4643 *offset = length; 4644 if (locked_tcb) { 4645 SCTP_TCB_UNLOCK(locked_tcb); 4646 } 4647 return (NULL); 4648 } 4649 } else { 4650 /* For cookies and all other chunks. */ 4651 if (chk_length > sizeof(chunk_buf)) { 4652 /* 4653 * use just the size of the chunk buffer so 4654 * the front part of our chunks fit in 4655 * contiguous space up to the chunk buffer 4656 * size (508 bytes). For chunks that need to 4657 * get more than that they must use the 4658 * sctp_m_getptr() function or other means 4659 * (e.g. know how to parse mbuf chains). 4660 * Cookies do this already. 4661 */ 4662 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4663 (sizeof(chunk_buf) - 4), 4664 chunk_buf); 4665 if (ch == NULL) { 4666 *offset = length; 4667 if (locked_tcb) { 4668 SCTP_TCB_UNLOCK(locked_tcb); 4669 } 4670 return (NULL); 4671 } 4672 } else { 4673 /* We can fit it all */ 4674 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4675 chk_length, chunk_buf); 4676 if (ch == NULL) { 4677 SCTP_PRINTF("sctp_process_control: Can't get the all data....\n"); 4678 *offset = length; 4679 if (locked_tcb) { 4680 SCTP_TCB_UNLOCK(locked_tcb); 4681 } 4682 return (NULL); 4683 } 4684 } 4685 } 4686 num_chunks++; 4687 /* Save off the last place we got a control from */ 4688 if (stcb != NULL) { 4689 if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) { 4690 /* 4691 * allow last_control to be NULL if 4692 * ASCONF... ASCONF processing will find the 4693 * right net later 4694 */ 4695 if ((netp != NULL) && (*netp != NULL)) 4696 stcb->asoc.last_control_chunk_from = *netp; 4697 } 4698 } 4699#ifdef SCTP_AUDITING_ENABLED 4700 sctp_audit_log(0xB0, ch->chunk_type); 4701#endif 4702 4703 /* check to see if this chunk required auth, but isn't */ 4704 if ((stcb != NULL) && 4705 !SCTP_BASE_SYSCTL(sctp_auth_disable) && 4706 sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) && 4707 !stcb->asoc.authenticated) { 4708 /* "silently" ignore */ 4709 SCTP_STAT_INCR(sctps_recvauthmissing); 4710 goto next_chunk; 4711 } 4712 switch (ch->chunk_type) { 4713 case SCTP_INITIATION: 4714 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n"); 4715 /* The INIT chunk must be the only chunk. */ 4716 if ((num_chunks > 1) || 4717 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4718 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4719 "INIT not the only chunk"); 4720 sctp_abort_association(inp, stcb, m, iphlen, 4721 src, dst, sh, op_err, 4722 use_mflowid, mflowid, 4723 vrf_id, port); 4724 *offset = length; 4725 return (NULL); 4726 } 4727 /* Honor our resource limit. */ 4728 if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) { 4729 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 4730 sctp_abort_association(inp, stcb, m, iphlen, 4731 src, dst, sh, op_err, 4732 use_mflowid, mflowid, 4733 vrf_id, port); 4734 *offset = length; 4735 return (NULL); 4736 } 4737 sctp_handle_init(m, iphlen, *offset, src, dst, sh, 4738 (struct sctp_init_chunk *)ch, inp, 4739 stcb, &abort_no_unlock, 4740 use_mflowid, mflowid, 4741 vrf_id, port); 4742 *offset = length; 4743 if ((!abort_no_unlock) && (locked_tcb)) { 4744 SCTP_TCB_UNLOCK(locked_tcb); 4745 } 4746 return (NULL); 4747 break; 4748 case SCTP_PAD_CHUNK: 4749 break; 4750 case SCTP_INITIATION_ACK: 4751 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT-ACK\n"); 4752 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4753 /* We are not interested anymore */ 4754 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4755 ; 4756 } else { 4757 if (locked_tcb != stcb) { 4758 /* Very unlikely */ 4759 SCTP_TCB_UNLOCK(locked_tcb); 4760 } 4761 *offset = length; 4762 if (stcb) { 4763#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4764 so = SCTP_INP_SO(inp); 4765 atomic_add_int(&stcb->asoc.refcnt, 1); 4766 SCTP_TCB_UNLOCK(stcb); 4767 SCTP_SOCKET_LOCK(so, 1); 4768 SCTP_TCB_LOCK(stcb); 4769 atomic_subtract_int(&stcb->asoc.refcnt, 1); 4770#endif 4771 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 4772#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4773 SCTP_SOCKET_UNLOCK(so, 1); 4774#endif 4775 } 4776 return (NULL); 4777 } 4778 } 4779 /* The INIT-ACK chunk must be the only chunk. */ 4780 if ((num_chunks > 1) || 4781 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4782 *offset = length; 4783 if (locked_tcb) { 4784 SCTP_TCB_UNLOCK(locked_tcb); 4785 } 4786 return (NULL); 4787 } 4788 if ((netp) && (*netp)) { 4789 ret = sctp_handle_init_ack(m, iphlen, *offset, 4790 src, dst, sh, 4791 (struct sctp_init_ack_chunk *)ch, 4792 stcb, *netp, 4793 &abort_no_unlock, 4794 use_mflowid, mflowid, 4795 vrf_id); 4796 } else { 4797 ret = -1; 4798 } 4799 *offset = length; 4800 if (abort_no_unlock) { 4801 return (NULL); 4802 } 4803 /* 4804 * Special case, I must call the output routine to 4805 * get the cookie echoed 4806 */ 4807 if ((stcb != NULL) && (ret == 0)) { 4808 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 4809 } 4810 if (locked_tcb) { 4811 SCTP_TCB_UNLOCK(locked_tcb); 4812 } 4813 return (NULL); 4814 break; 4815 case SCTP_SELECTIVE_ACK: 4816 { 4817 struct sctp_sack_chunk *sack; 4818 int abort_now = 0; 4819 uint32_t a_rwnd, cum_ack; 4820 uint16_t num_seg, num_dup; 4821 uint8_t flags; 4822 int offset_seg, offset_dup; 4823 4824 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK\n"); 4825 SCTP_STAT_INCR(sctps_recvsacks); 4826 if (stcb == NULL) { 4827 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing SACK chunk\n"); 4828 break; 4829 } 4830 if (chk_length < sizeof(struct sctp_sack_chunk)) { 4831 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n"); 4832 break; 4833 } 4834 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4835 /*- 4836 * If we have sent a shutdown-ack, we will pay no 4837 * attention to a sack sent in to us since 4838 * we don't care anymore. 4839 */ 4840 break; 4841 } 4842 sack = (struct sctp_sack_chunk *)ch; 4843 flags = ch->chunk_flags; 4844 cum_ack = ntohl(sack->sack.cum_tsn_ack); 4845 num_seg = ntohs(sack->sack.num_gap_ack_blks); 4846 num_dup = ntohs(sack->sack.num_dup_tsns); 4847 a_rwnd = (uint32_t) ntohl(sack->sack.a_rwnd); 4848 if (sizeof(struct sctp_sack_chunk) + 4849 num_seg * sizeof(struct sctp_gap_ack_block) + 4850 num_dup * sizeof(uint32_t) != chk_length) { 4851 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n"); 4852 break; 4853 } 4854 offset_seg = *offset + sizeof(struct sctp_sack_chunk); 4855 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 4856 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n", 4857 cum_ack, num_seg, a_rwnd); 4858 stcb->asoc.seen_a_sack_this_pkt = 1; 4859 if ((stcb->asoc.pr_sctp_cnt == 0) && 4860 (num_seg == 0) && 4861 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 4862 (stcb->asoc.saw_sack_with_frags == 0) && 4863 (stcb->asoc.saw_sack_with_nr_frags == 0) && 4864 (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) 4865 ) { 4866 /* 4867 * We have a SIMPLE sack having no 4868 * prior segments and data on sent 4869 * queue to be acked.. Use the 4870 * faster path sack processing. We 4871 * also allow window update sacks 4872 * with no missing segments to go 4873 * this way too. 4874 */ 4875 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, &abort_now, ecne_seen); 4876 } else { 4877 if (netp && *netp) 4878 sctp_handle_sack(m, offset_seg, offset_dup, stcb, 4879 num_seg, 0, num_dup, &abort_now, flags, 4880 cum_ack, a_rwnd, ecne_seen); 4881 } 4882 if (abort_now) { 4883 /* ABORT signal from sack processing */ 4884 *offset = length; 4885 return (NULL); 4886 } 4887 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 4888 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 4889 (stcb->asoc.stream_queue_cnt == 0)) { 4890 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 4891 } 4892 } 4893 break; 4894 /* 4895 * EY - nr_sack: If the received chunk is an 4896 * nr_sack chunk 4897 */ 4898 case SCTP_NR_SELECTIVE_ACK: 4899 { 4900 struct sctp_nr_sack_chunk *nr_sack; 4901 int abort_now = 0; 4902 uint32_t a_rwnd, cum_ack; 4903 uint16_t num_seg, num_nr_seg, num_dup; 4904 uint8_t flags; 4905 int offset_seg, offset_dup; 4906 4907 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK\n"); 4908 SCTP_STAT_INCR(sctps_recvsacks); 4909 if (stcb == NULL) { 4910 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing NR-SACK chunk\n"); 4911 break; 4912 } 4913 if ((stcb->asoc.sctp_nr_sack_on_off == 0) || 4914 (stcb->asoc.peer_supports_nr_sack == 0)) { 4915 goto unknown_chunk; 4916 } 4917 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) { 4918 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR-SACK chunk, too small\n"); 4919 break; 4920 } 4921 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4922 /*- 4923 * If we have sent a shutdown-ack, we will pay no 4924 * attention to a sack sent in to us since 4925 * we don't care anymore. 4926 */ 4927 break; 4928 } 4929 nr_sack = (struct sctp_nr_sack_chunk *)ch; 4930 flags = ch->chunk_flags; 4931 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack); 4932 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks); 4933 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks); 4934 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns); 4935 a_rwnd = (uint32_t) ntohl(nr_sack->nr_sack.a_rwnd); 4936 if (sizeof(struct sctp_nr_sack_chunk) + 4937 (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) + 4938 num_dup * sizeof(uint32_t) != chk_length) { 4939 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n"); 4940 break; 4941 } 4942 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk); 4943 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 4944 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n", 4945 cum_ack, num_seg, a_rwnd); 4946 stcb->asoc.seen_a_sack_this_pkt = 1; 4947 if ((stcb->asoc.pr_sctp_cnt == 0) && 4948 (num_seg == 0) && (num_nr_seg == 0) && 4949 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 4950 (stcb->asoc.saw_sack_with_frags == 0) && 4951 (stcb->asoc.saw_sack_with_nr_frags == 0) && 4952 (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) { 4953 /* 4954 * We have a SIMPLE sack having no 4955 * prior segments and data on sent 4956 * queue to be acked. Use the faster 4957 * path sack processing. We also 4958 * allow window update sacks with no 4959 * missing segments to go this way 4960 * too. 4961 */ 4962 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, 4963 &abort_now, ecne_seen); 4964 } else { 4965 if (netp && *netp) 4966 sctp_handle_sack(m, offset_seg, offset_dup, stcb, 4967 num_seg, num_nr_seg, num_dup, &abort_now, flags, 4968 cum_ack, a_rwnd, ecne_seen); 4969 } 4970 if (abort_now) { 4971 /* ABORT signal from sack processing */ 4972 *offset = length; 4973 return (NULL); 4974 } 4975 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 4976 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 4977 (stcb->asoc.stream_queue_cnt == 0)) { 4978 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 4979 } 4980 } 4981 break; 4982 4983 case SCTP_HEARTBEAT_REQUEST: 4984 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n"); 4985 if ((stcb) && netp && *netp) { 4986 SCTP_STAT_INCR(sctps_recvheartbeat); 4987 sctp_send_heartbeat_ack(stcb, m, *offset, 4988 chk_length, *netp); 4989 4990 /* He's alive so give him credit */ 4991 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4992 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4993 stcb->asoc.overall_error_count, 4994 0, 4995 SCTP_FROM_SCTP_INPUT, 4996 __LINE__); 4997 } 4998 stcb->asoc.overall_error_count = 0; 4999 } 5000 break; 5001 case SCTP_HEARTBEAT_ACK: 5002 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT-ACK\n"); 5003 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) { 5004 /* Its not ours */ 5005 *offset = length; 5006 if (locked_tcb) { 5007 SCTP_TCB_UNLOCK(locked_tcb); 5008 } 5009 return (NULL); 5010 } 5011 /* He's alive so give him credit */ 5012 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5013 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5014 stcb->asoc.overall_error_count, 5015 0, 5016 SCTP_FROM_SCTP_INPUT, 5017 __LINE__); 5018 } 5019 stcb->asoc.overall_error_count = 0; 5020 SCTP_STAT_INCR(sctps_recvheartbeatack); 5021 if (netp && *netp) 5022 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch, 5023 stcb, *netp); 5024 break; 5025 case SCTP_ABORT_ASSOCIATION: 5026 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n", 5027 (void *)stcb); 5028 if ((stcb) && netp && *netp) 5029 sctp_handle_abort((struct sctp_abort_chunk *)ch, 5030 stcb, *netp); 5031 *offset = length; 5032 return (NULL); 5033 break; 5034 case SCTP_SHUTDOWN: 5035 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n", 5036 (void *)stcb); 5037 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) { 5038 *offset = length; 5039 if (locked_tcb) { 5040 SCTP_TCB_UNLOCK(locked_tcb); 5041 } 5042 return (NULL); 5043 } 5044 if (netp && *netp) { 5045 int abort_flag = 0; 5046 5047 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch, 5048 stcb, *netp, &abort_flag); 5049 if (abort_flag) { 5050 *offset = length; 5051 return (NULL); 5052 } 5053 } 5054 break; 5055 case SCTP_SHUTDOWN_ACK: 5056 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-ACK, stcb %p\n", (void *)stcb); 5057 if ((stcb) && (netp) && (*netp)) 5058 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp); 5059 *offset = length; 5060 return (NULL); 5061 break; 5062 5063 case SCTP_OPERATION_ERROR: 5064 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP-ERR\n"); 5065 if ((stcb) && netp && *netp && sctp_handle_error(ch, stcb, *netp) < 0) { 5066 *offset = length; 5067 return (NULL); 5068 } 5069 break; 5070 case SCTP_COOKIE_ECHO: 5071 SCTPDBG(SCTP_DEBUG_INPUT3, 5072 "SCTP_COOKIE-ECHO, stcb %p\n", (void *)stcb); 5073 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 5074 ; 5075 } else { 5076 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5077 /* We are not interested anymore */ 5078 abend: 5079 if (stcb) { 5080 SCTP_TCB_UNLOCK(stcb); 5081 } 5082 *offset = length; 5083 return (NULL); 5084 } 5085 } 5086 /* 5087 * First are we accepting? We do this again here 5088 * since it is possible that a previous endpoint WAS 5089 * listening responded to a INIT-ACK and then 5090 * closed. We opened and bound.. and are now no 5091 * longer listening. 5092 */ 5093 5094 if ((stcb == NULL) && (inp->sctp_socket->so_qlen >= inp->sctp_socket->so_qlimit)) { 5095 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 5096 (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) { 5097 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 5098 sctp_abort_association(inp, stcb, m, iphlen, 5099 src, dst, sh, op_err, 5100 use_mflowid, mflowid, 5101 vrf_id, port); 5102 } 5103 *offset = length; 5104 return (NULL); 5105 } else { 5106 struct mbuf *ret_buf; 5107 struct sctp_inpcb *linp; 5108 5109 if (stcb) { 5110 linp = NULL; 5111 } else { 5112 linp = inp; 5113 } 5114 5115 if (linp) { 5116 SCTP_ASOC_CREATE_LOCK(linp); 5117 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 5118 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) { 5119 SCTP_ASOC_CREATE_UNLOCK(linp); 5120 goto abend; 5121 } 5122 } 5123 if (netp) { 5124 ret_buf = 5125 sctp_handle_cookie_echo(m, iphlen, 5126 *offset, 5127 src, dst, 5128 sh, 5129 (struct sctp_cookie_echo_chunk *)ch, 5130 &inp, &stcb, netp, 5131 auth_skipped, 5132 auth_offset, 5133 auth_len, 5134 &locked_tcb, 5135 use_mflowid, 5136 mflowid, 5137 vrf_id, 5138 port); 5139 } else { 5140 ret_buf = NULL; 5141 } 5142 if (linp) { 5143 SCTP_ASOC_CREATE_UNLOCK(linp); 5144 } 5145 if (ret_buf == NULL) { 5146 if (locked_tcb) { 5147 SCTP_TCB_UNLOCK(locked_tcb); 5148 } 5149 SCTPDBG(SCTP_DEBUG_INPUT3, 5150 "GAK, null buffer\n"); 5151 *offset = length; 5152 return (NULL); 5153 } 5154 /* if AUTH skipped, see if it verified... */ 5155 if (auth_skipped) { 5156 got_auth = 1; 5157 auth_skipped = 0; 5158 } 5159 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) { 5160 /* 5161 * Restart the timer if we have 5162 * pending data 5163 */ 5164 struct sctp_tmit_chunk *chk; 5165 5166 chk = TAILQ_FIRST(&stcb->asoc.sent_queue); 5167 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 5168 } 5169 } 5170 break; 5171 case SCTP_COOKIE_ACK: 5172 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE-ACK, stcb %p\n", (void *)stcb); 5173 if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) { 5174 if (locked_tcb) { 5175 SCTP_TCB_UNLOCK(locked_tcb); 5176 } 5177 return (NULL); 5178 } 5179 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5180 /* We are not interested anymore */ 5181 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 5182 ; 5183 } else if (stcb) { 5184#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5185 so = SCTP_INP_SO(inp); 5186 atomic_add_int(&stcb->asoc.refcnt, 1); 5187 SCTP_TCB_UNLOCK(stcb); 5188 SCTP_SOCKET_LOCK(so, 1); 5189 SCTP_TCB_LOCK(stcb); 5190 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5191#endif 5192 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 5193#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5194 SCTP_SOCKET_UNLOCK(so, 1); 5195#endif 5196 *offset = length; 5197 return (NULL); 5198 } 5199 } 5200 /* He's alive so give him credit */ 5201 if ((stcb) && netp && *netp) { 5202 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5203 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5204 stcb->asoc.overall_error_count, 5205 0, 5206 SCTP_FROM_SCTP_INPUT, 5207 __LINE__); 5208 } 5209 stcb->asoc.overall_error_count = 0; 5210 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp); 5211 } 5212 break; 5213 case SCTP_ECN_ECHO: 5214 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-ECHO\n"); 5215 /* He's alive so give him credit */ 5216 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) { 5217 /* Its not ours */ 5218 if (locked_tcb) { 5219 SCTP_TCB_UNLOCK(locked_tcb); 5220 } 5221 *offset = length; 5222 return (NULL); 5223 } 5224 if (stcb) { 5225 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5226 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5227 stcb->asoc.overall_error_count, 5228 0, 5229 SCTP_FROM_SCTP_INPUT, 5230 __LINE__); 5231 } 5232 stcb->asoc.overall_error_count = 0; 5233 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, 5234 stcb); 5235 ecne_seen = 1; 5236 } 5237 break; 5238 case SCTP_ECN_CWR: 5239 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-CWR\n"); 5240 /* He's alive so give him credit */ 5241 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) { 5242 /* Its not ours */ 5243 if (locked_tcb) { 5244 SCTP_TCB_UNLOCK(locked_tcb); 5245 } 5246 *offset = length; 5247 return (NULL); 5248 } 5249 if (stcb) { 5250 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5251 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5252 stcb->asoc.overall_error_count, 5253 0, 5254 SCTP_FROM_SCTP_INPUT, 5255 __LINE__); 5256 } 5257 stcb->asoc.overall_error_count = 0; 5258 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp); 5259 } 5260 break; 5261 case SCTP_SHUTDOWN_COMPLETE: 5262 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-COMPLETE, stcb %p\n", (void *)stcb); 5263 /* must be first and only chunk */ 5264 if ((num_chunks > 1) || 5265 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 5266 *offset = length; 5267 if (locked_tcb) { 5268 SCTP_TCB_UNLOCK(locked_tcb); 5269 } 5270 return (NULL); 5271 } 5272 if ((stcb) && netp && *netp) { 5273 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch, 5274 stcb, *netp); 5275 } 5276 *offset = length; 5277 return (NULL); 5278 break; 5279 case SCTP_ASCONF: 5280 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n"); 5281 /* He's alive so give him credit */ 5282 if (stcb) { 5283 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5284 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5285 stcb->asoc.overall_error_count, 5286 0, 5287 SCTP_FROM_SCTP_INPUT, 5288 __LINE__); 5289 } 5290 stcb->asoc.overall_error_count = 0; 5291 sctp_handle_asconf(m, *offset, src, 5292 (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0); 5293 asconf_cnt++; 5294 } 5295 break; 5296 case SCTP_ASCONF_ACK: 5297 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF-ACK\n"); 5298 if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) { 5299 /* Its not ours */ 5300 if (locked_tcb) { 5301 SCTP_TCB_UNLOCK(locked_tcb); 5302 } 5303 *offset = length; 5304 return (NULL); 5305 } 5306 if ((stcb) && netp && *netp) { 5307 /* He's alive so give him credit */ 5308 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5309 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5310 stcb->asoc.overall_error_count, 5311 0, 5312 SCTP_FROM_SCTP_INPUT, 5313 __LINE__); 5314 } 5315 stcb->asoc.overall_error_count = 0; 5316 sctp_handle_asconf_ack(m, *offset, 5317 (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock); 5318 if (abort_no_unlock) 5319 return (NULL); 5320 } 5321 break; 5322 case SCTP_FORWARD_CUM_TSN: 5323 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD-TSN\n"); 5324 if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) { 5325 /* Its not ours */ 5326 if (locked_tcb) { 5327 SCTP_TCB_UNLOCK(locked_tcb); 5328 } 5329 *offset = length; 5330 return (NULL); 5331 } 5332 /* He's alive so give him credit */ 5333 if (stcb) { 5334 int abort_flag = 0; 5335 5336 stcb->asoc.overall_error_count = 0; 5337 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5338 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5339 stcb->asoc.overall_error_count, 5340 0, 5341 SCTP_FROM_SCTP_INPUT, 5342 __LINE__); 5343 } 5344 *fwd_tsn_seen = 1; 5345 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5346 /* We are not interested anymore */ 5347#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5348 so = SCTP_INP_SO(inp); 5349 atomic_add_int(&stcb->asoc.refcnt, 1); 5350 SCTP_TCB_UNLOCK(stcb); 5351 SCTP_SOCKET_LOCK(so, 1); 5352 SCTP_TCB_LOCK(stcb); 5353 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5354#endif 5355 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_29); 5356#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5357 SCTP_SOCKET_UNLOCK(so, 1); 5358#endif 5359 *offset = length; 5360 return (NULL); 5361 } 5362 sctp_handle_forward_tsn(stcb, 5363 (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset); 5364 if (abort_flag) { 5365 *offset = length; 5366 return (NULL); 5367 } else { 5368 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5369 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5370 stcb->asoc.overall_error_count, 5371 0, 5372 SCTP_FROM_SCTP_INPUT, 5373 __LINE__); 5374 } 5375 stcb->asoc.overall_error_count = 0; 5376 } 5377 5378 } 5379 break; 5380 case SCTP_STREAM_RESET: 5381 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n"); 5382 if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) { 5383 /* Its not ours */ 5384 if (locked_tcb) { 5385 SCTP_TCB_UNLOCK(locked_tcb); 5386 } 5387 *offset = length; 5388 return (NULL); 5389 } 5390 if (stcb->asoc.peer_supports_strreset == 0) { 5391 /* 5392 * hmm, peer should have announced this, but 5393 * we will turn it on since he is sending us 5394 * a stream reset. 5395 */ 5396 stcb->asoc.peer_supports_strreset = 1; 5397 } 5398 if (sctp_handle_stream_reset(stcb, m, *offset, ch)) { 5399 /* stop processing */ 5400 *offset = length; 5401 return (NULL); 5402 } 5403 break; 5404 case SCTP_PACKET_DROPPED: 5405 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n"); 5406 /* re-get it all please */ 5407 if (chk_length < sizeof(struct sctp_pktdrop_chunk)) { 5408 /* Its not ours */ 5409 if (locked_tcb) { 5410 SCTP_TCB_UNLOCK(locked_tcb); 5411 } 5412 *offset = length; 5413 return (NULL); 5414 } 5415 if (ch && (stcb) && netp && (*netp)) { 5416 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch, 5417 stcb, *netp, 5418 min(chk_length, (sizeof(chunk_buf) - 4))); 5419 5420 } 5421 break; 5422 5423 case SCTP_AUTHENTICATION: 5424 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n"); 5425 if (SCTP_BASE_SYSCTL(sctp_auth_disable)) 5426 goto unknown_chunk; 5427 5428 if (stcb == NULL) { 5429 /* save the first AUTH for later processing */ 5430 if (auth_skipped == 0) { 5431 auth_offset = *offset; 5432 auth_len = chk_length; 5433 auth_skipped = 1; 5434 } 5435 /* skip this chunk (temporarily) */ 5436 goto next_chunk; 5437 } 5438 if ((chk_length < (sizeof(struct sctp_auth_chunk))) || 5439 (chk_length > (sizeof(struct sctp_auth_chunk) + 5440 SCTP_AUTH_DIGEST_LEN_MAX))) { 5441 /* Its not ours */ 5442 if (locked_tcb) { 5443 SCTP_TCB_UNLOCK(locked_tcb); 5444 } 5445 *offset = length; 5446 return (NULL); 5447 } 5448 if (got_auth == 1) { 5449 /* skip this chunk... it's already auth'd */ 5450 goto next_chunk; 5451 } 5452 got_auth = 1; 5453 if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch, 5454 m, *offset)) { 5455 /* auth HMAC failed so dump the packet */ 5456 *offset = length; 5457 return (stcb); 5458 } else { 5459 /* remaining chunks are HMAC checked */ 5460 stcb->asoc.authenticated = 1; 5461 } 5462 break; 5463 5464 default: 5465 unknown_chunk: 5466 /* it's an unknown chunk! */ 5467 if ((ch->chunk_type & 0x40) && (stcb != NULL)) { 5468 struct mbuf *mm; 5469 struct sctp_paramhdr *phd; 5470 5471 mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 5472 0, M_NOWAIT, 1, MT_DATA); 5473 if (mm) { 5474 phd = mtod(mm, struct sctp_paramhdr *); 5475 /* 5476 * We cheat and use param type since 5477 * we did not bother to define a 5478 * error cause struct. They are the 5479 * same basic format with different 5480 * names. 5481 */ 5482 phd->param_type = htons(SCTP_CAUSE_UNRECOG_CHUNK); 5483 phd->param_length = htons(chk_length + sizeof(*phd)); 5484 SCTP_BUF_LEN(mm) = sizeof(*phd); 5485 SCTP_BUF_NEXT(mm) = SCTP_M_COPYM(m, *offset, chk_length, M_NOWAIT); 5486 if (SCTP_BUF_NEXT(mm)) { 5487 if (sctp_pad_lastmbuf(SCTP_BUF_NEXT(mm), SCTP_SIZE32(chk_length) - chk_length, NULL)) { 5488 sctp_m_freem(mm); 5489 } else { 5490#ifdef SCTP_MBUF_LOGGING 5491 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5492 struct mbuf *mat; 5493 5494 for (mat = SCTP_BUF_NEXT(mm); mat; mat = SCTP_BUF_NEXT(mat)) { 5495 if (SCTP_BUF_IS_EXTENDED(mat)) { 5496 sctp_log_mb(mat, SCTP_MBUF_ICOPY); 5497 } 5498 } 5499 } 5500#endif 5501 sctp_queue_op_err(stcb, mm); 5502 } 5503 } else { 5504 sctp_m_freem(mm); 5505 } 5506 } 5507 } 5508 if ((ch->chunk_type & 0x80) == 0) { 5509 /* discard this packet */ 5510 *offset = length; 5511 return (stcb); 5512 } /* else skip this bad chunk and continue... */ 5513 break; 5514 } /* switch (ch->chunk_type) */ 5515 5516 5517next_chunk: 5518 /* get the next chunk */ 5519 *offset += SCTP_SIZE32(chk_length); 5520 if (*offset >= length) { 5521 /* no more data left in the mbuf chain */ 5522 break; 5523 } 5524 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 5525 sizeof(struct sctp_chunkhdr), chunk_buf); 5526 if (ch == NULL) { 5527 if (locked_tcb) { 5528 SCTP_TCB_UNLOCK(locked_tcb); 5529 } 5530 *offset = length; 5531 return (NULL); 5532 } 5533 } /* while */ 5534 5535 if (asconf_cnt > 0 && stcb != NULL) { 5536 sctp_send_asconf_ack(stcb); 5537 } 5538 return (stcb); 5539} 5540 5541 5542#ifdef INVARIANTS 5543#ifdef __GNUC__ 5544__attribute__((noinline)) 5545#endif 5546 void 5547 sctp_validate_no_locks(struct sctp_inpcb *inp) 5548{ 5549 struct sctp_tcb *lstcb; 5550 5551 LIST_FOREACH(lstcb, &inp->sctp_asoc_list, sctp_tcblist) { 5552 if (mtx_owned(&lstcb->tcb_mtx)) { 5553 panic("Own lock on stcb at return from input"); 5554 } 5555 } 5556 if (mtx_owned(&inp->inp_create_mtx)) { 5557 panic("Own create lock on inp"); 5558 } 5559 if (mtx_owned(&inp->inp_mtx)) { 5560 panic("Own inp lock on inp"); 5561 } 5562} 5563 5564#endif 5565 5566/* 5567 * common input chunk processing (v4 and v6) 5568 */ 5569void 5570sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length, 5571 struct sockaddr *src, struct sockaddr *dst, 5572 struct sctphdr *sh, struct sctp_chunkhdr *ch, 5573#if !defined(SCTP_WITH_NO_CSUM) 5574 uint8_t compute_crc, 5575#endif 5576 uint8_t ecn_bits, 5577 uint8_t use_mflowid, uint32_t mflowid, 5578 uint32_t vrf_id, uint16_t port) 5579{ 5580 uint32_t high_tsn; 5581 int fwd_tsn_seen = 0, data_processed = 0; 5582 struct mbuf *m = *mm, *op_err; 5583 char msg[SCTP_DIAG_INFO_LEN]; 5584 int un_sent; 5585 int cnt_ctrl_ready = 0; 5586 struct sctp_inpcb *inp = NULL, *inp_decr = NULL; 5587 struct sctp_tcb *stcb = NULL; 5588 struct sctp_nets *net = NULL; 5589 5590 SCTP_STAT_INCR(sctps_recvdatagrams); 5591#ifdef SCTP_AUDITING_ENABLED 5592 sctp_audit_log(0xE0, 1); 5593 sctp_auditing(0, inp, stcb, net); 5594#endif 5595#if !defined(SCTP_WITH_NO_CSUM) 5596 if (compute_crc != 0) { 5597 uint32_t check, calc_check; 5598 5599 check = sh->checksum; 5600 sh->checksum = 0; 5601 calc_check = sctp_calculate_cksum(m, iphlen); 5602 sh->checksum = check; 5603 if (calc_check != check) { 5604 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x m:%p mlen:%d iphlen:%d\n", 5605 calc_check, check, (void *)m, length, iphlen); 5606 stcb = sctp_findassociation_addr(m, offset, src, dst, 5607 sh, ch, &inp, &net, vrf_id); 5608#if defined(INET) || defined(INET6) 5609 if ((net != NULL) && (port != 0)) { 5610 if (net->port == 0) { 5611 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr)); 5612 } 5613 net->port = port; 5614 } 5615#endif 5616 if ((net != NULL) && (use_mflowid != 0)) { 5617 net->flowid = mflowid; 5618#ifdef INVARIANTS 5619 net->flowidset = 1; 5620#endif 5621 } 5622 if ((inp != NULL) && (stcb != NULL)) { 5623 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1); 5624 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED); 5625 } else if ((inp != NULL) && (stcb == NULL)) { 5626 inp_decr = inp; 5627 } 5628 SCTP_STAT_INCR(sctps_badsum); 5629 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors); 5630 goto out; 5631 } 5632 } 5633#endif 5634 /* Destination port of 0 is illegal, based on RFC4960. */ 5635 if (sh->dest_port == 0) { 5636 SCTP_STAT_INCR(sctps_hdrops); 5637 goto out; 5638 } 5639 stcb = sctp_findassociation_addr(m, offset, src, dst, 5640 sh, ch, &inp, &net, vrf_id); 5641#if defined(INET) || defined(INET6) 5642 if ((net != NULL) && (port != 0)) { 5643 if (net->port == 0) { 5644 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr)); 5645 } 5646 net->port = port; 5647 } 5648#endif 5649 if ((net != NULL) && (use_mflowid != 0)) { 5650 net->flowid = mflowid; 5651#ifdef INVARIANTS 5652 net->flowidset = 1; 5653#endif 5654 } 5655 if (inp == NULL) { 5656 SCTP_STAT_INCR(sctps_noport); 5657 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) { 5658 goto out; 5659 } 5660 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 5661 sctp_send_shutdown_complete2(src, dst, sh, 5662 use_mflowid, mflowid, 5663 vrf_id, port); 5664 goto out; 5665 } 5666 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) { 5667 goto out; 5668 } 5669 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) { 5670 if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) || 5671 ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) && 5672 (ch->chunk_type != SCTP_INIT))) { 5673 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5674 "Out of the blue"); 5675 sctp_send_abort(m, iphlen, src, dst, 5676 sh, 0, op_err, 5677 use_mflowid, mflowid, 5678 vrf_id, port); 5679 } 5680 } 5681 goto out; 5682 } else if (stcb == NULL) { 5683 inp_decr = inp; 5684 } 5685#ifdef IPSEC 5686 /*- 5687 * I very much doubt any of the IPSEC stuff will work but I have no 5688 * idea, so I will leave it in place. 5689 */ 5690 if (inp != NULL) { 5691 switch (dst->sa_family) { 5692#ifdef INET 5693 case AF_INET: 5694 if (ipsec4_in_reject(m, &inp->ip_inp.inp)) { 5695 IPSECSTAT_INC(ips_in_polvio); 5696 SCTP_STAT_INCR(sctps_hdrops); 5697 goto out; 5698 } 5699 break; 5700#endif 5701#ifdef INET6 5702 case AF_INET6: 5703 if (ipsec6_in_reject(m, &inp->ip_inp.inp)) { 5704 IPSEC6STAT_INC(ips_in_polvio); 5705 SCTP_STAT_INCR(sctps_hdrops); 5706 goto out; 5707 } 5708 break; 5709#endif 5710 default: 5711 break; 5712 } 5713 } 5714#endif 5715 SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n", 5716 (void *)m, iphlen, offset, length, (void *)stcb); 5717 if (stcb) { 5718 /* always clear this before beginning a packet */ 5719 stcb->asoc.authenticated = 0; 5720 stcb->asoc.seen_a_sack_this_pkt = 0; 5721 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n", 5722 (void *)stcb, stcb->asoc.state); 5723 5724 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) || 5725 (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) { 5726 /*- 5727 * If we hit here, we had a ref count 5728 * up when the assoc was aborted and the 5729 * timer is clearing out the assoc, we should 5730 * NOT respond to any packet.. its OOTB. 5731 */ 5732 SCTP_TCB_UNLOCK(stcb); 5733 stcb = NULL; 5734 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__); 5735 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5736 msg); 5737 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5738 use_mflowid, mflowid, 5739 vrf_id, port); 5740 goto out; 5741 } 5742 } 5743 if (IS_SCTP_CONTROL(ch)) { 5744 /* process the control portion of the SCTP packet */ 5745 /* sa_ignore NO_NULL_CHK */ 5746 stcb = sctp_process_control(m, iphlen, &offset, length, 5747 src, dst, sh, ch, 5748 inp, stcb, &net, &fwd_tsn_seen, 5749 use_mflowid, mflowid, 5750 vrf_id, port); 5751 if (stcb) { 5752 /* 5753 * This covers us if the cookie-echo was there and 5754 * it changes our INP. 5755 */ 5756 inp = stcb->sctp_ep; 5757#if defined(INET) || defined(INET6) 5758 if ((net) && (port)) { 5759 if (net->port == 0) { 5760 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr)); 5761 } 5762 net->port = port; 5763 } 5764#endif 5765 } 5766 } else { 5767 /* 5768 * no control chunks, so pre-process DATA chunks (these 5769 * checks are taken care of by control processing) 5770 */ 5771 5772 /* 5773 * if DATA only packet, and auth is required, then punt... 5774 * can't have authenticated without any AUTH (control) 5775 * chunks 5776 */ 5777 if ((stcb != NULL) && 5778 !SCTP_BASE_SYSCTL(sctp_auth_disable) && 5779 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) { 5780 /* "silently" ignore */ 5781 SCTP_STAT_INCR(sctps_recvauthmissing); 5782 goto out; 5783 } 5784 if (stcb == NULL) { 5785 /* out of the blue DATA chunk */ 5786 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__); 5787 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5788 msg); 5789 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5790 use_mflowid, mflowid, 5791 vrf_id, port); 5792 goto out; 5793 } 5794 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) { 5795 /* v_tag mismatch! */ 5796 SCTP_STAT_INCR(sctps_badvtag); 5797 goto out; 5798 } 5799 } 5800 5801 if (stcb == NULL) { 5802 /* 5803 * no valid TCB for this packet, or we found it's a bad 5804 * packet while processing control, or we're done with this 5805 * packet (done or skip rest of data), so we drop it... 5806 */ 5807 goto out; 5808 } 5809 /* 5810 * DATA chunk processing 5811 */ 5812 /* plow through the data chunks while length > offset */ 5813 5814 /* 5815 * Rest should be DATA only. Check authentication state if AUTH for 5816 * DATA is required. 5817 */ 5818 if ((length > offset) && 5819 (stcb != NULL) && 5820 !SCTP_BASE_SYSCTL(sctp_auth_disable) && 5821 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) && 5822 !stcb->asoc.authenticated) { 5823 /* "silently" ignore */ 5824 SCTP_STAT_INCR(sctps_recvauthmissing); 5825 SCTPDBG(SCTP_DEBUG_AUTH1, 5826 "Data chunk requires AUTH, skipped\n"); 5827 goto trigger_send; 5828 } 5829 if (length > offset) { 5830 int retval; 5831 5832 /* 5833 * First check to make sure our state is correct. We would 5834 * not get here unless we really did have a tag, so we don't 5835 * abort if this happens, just dump the chunk silently. 5836 */ 5837 switch (SCTP_GET_STATE(&stcb->asoc)) { 5838 case SCTP_STATE_COOKIE_ECHOED: 5839 /* 5840 * we consider data with valid tags in this state 5841 * shows us the cookie-ack was lost. Imply it was 5842 * there. 5843 */ 5844 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5845 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5846 stcb->asoc.overall_error_count, 5847 0, 5848 SCTP_FROM_SCTP_INPUT, 5849 __LINE__); 5850 } 5851 stcb->asoc.overall_error_count = 0; 5852 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net); 5853 break; 5854 case SCTP_STATE_COOKIE_WAIT: 5855 /* 5856 * We consider OOTB any data sent during asoc setup. 5857 */ 5858 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__); 5859 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5860 msg); 5861 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5862 use_mflowid, mflowid, 5863 vrf_id, port); 5864 goto out; 5865 /* sa_ignore NOTREACHED */ 5866 break; 5867 case SCTP_STATE_EMPTY: /* should not happen */ 5868 case SCTP_STATE_INUSE: /* should not happen */ 5869 case SCTP_STATE_SHUTDOWN_RECEIVED: /* This is a peer error */ 5870 case SCTP_STATE_SHUTDOWN_ACK_SENT: 5871 default: 5872 goto out; 5873 /* sa_ignore NOTREACHED */ 5874 break; 5875 case SCTP_STATE_OPEN: 5876 case SCTP_STATE_SHUTDOWN_SENT: 5877 break; 5878 } 5879 /* plow through the data chunks while length > offset */ 5880 retval = sctp_process_data(mm, iphlen, &offset, length, 5881 src, dst, sh, 5882 inp, stcb, net, &high_tsn, 5883 use_mflowid, mflowid, 5884 vrf_id, port); 5885 if (retval == 2) { 5886 /* 5887 * The association aborted, NO UNLOCK needed since 5888 * the association is destroyed. 5889 */ 5890 stcb = NULL; 5891 goto out; 5892 } 5893 data_processed = 1; 5894 /* 5895 * Anything important needs to have been m_copy'ed in 5896 * process_data 5897 */ 5898 } 5899 /* take care of ecn */ 5900 if ((data_processed == 1) && 5901 (stcb->asoc.ecn_allowed == 1) && 5902 ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) { 5903 /* Yep, we need to add a ECNE */ 5904 sctp_send_ecn_echo(stcb, net, high_tsn); 5905 } 5906 if ((data_processed == 0) && (fwd_tsn_seen)) { 5907 int was_a_gap; 5908 uint32_t highest_tsn; 5909 5910 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) { 5911 highest_tsn = stcb->asoc.highest_tsn_inside_nr_map; 5912 } else { 5913 highest_tsn = stcb->asoc.highest_tsn_inside_map; 5914 } 5915 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn); 5916 stcb->asoc.send_sack = 1; 5917 sctp_sack_check(stcb, was_a_gap); 5918 } else if (fwd_tsn_seen) { 5919 stcb->asoc.send_sack = 1; 5920 } 5921 /* trigger send of any chunks in queue... */ 5922trigger_send: 5923#ifdef SCTP_AUDITING_ENABLED 5924 sctp_audit_log(0xE0, 2); 5925 sctp_auditing(1, inp, stcb, net); 5926#endif 5927 SCTPDBG(SCTP_DEBUG_INPUT1, 5928 "Check for chunk output prw:%d tqe:%d tf=%d\n", 5929 stcb->asoc.peers_rwnd, 5930 TAILQ_EMPTY(&stcb->asoc.control_send_queue), 5931 stcb->asoc.total_flight); 5932 un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight); 5933 if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 5934 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq; 5935 } 5936 if (cnt_ctrl_ready || 5937 ((un_sent) && 5938 (stcb->asoc.peers_rwnd > 0 || 5939 (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) { 5940 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n"); 5941 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 5942 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n"); 5943 } 5944#ifdef SCTP_AUDITING_ENABLED 5945 sctp_audit_log(0xE0, 3); 5946 sctp_auditing(2, inp, stcb, net); 5947#endif 5948out: 5949 if (stcb != NULL) { 5950 SCTP_TCB_UNLOCK(stcb); 5951 } 5952 if (inp_decr != NULL) { 5953 /* reduce ref-count */ 5954 SCTP_INP_WLOCK(inp_decr); 5955 SCTP_INP_DECR_REF(inp_decr); 5956 SCTP_INP_WUNLOCK(inp_decr); 5957 } 5958#ifdef INVARIANTS 5959 if (inp != NULL) { 5960 sctp_validate_no_locks(inp); 5961 } 5962#endif 5963 return; 5964} 5965 5966#if 0 5967static void 5968sctp_print_mbuf_chain(struct mbuf *m) 5969{ 5970 for (; m; m = SCTP_BUF_NEXT(m)) { 5971 SCTP_PRINTF("%p: m_len = %ld\n", (void *)m, SCTP_BUF_LEN(m)); 5972 if (SCTP_BUF_IS_EXTENDED(m)) 5973 SCTP_PRINTF("%p: extend_size = %d\n", (void *)m, SCTP_BUF_EXTEND_SIZE(m)); 5974 } 5975} 5976 5977#endif 5978 5979#ifdef INET 5980void 5981sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port) 5982{ 5983 struct mbuf *m; 5984 int iphlen; 5985 uint32_t vrf_id = 0; 5986 uint8_t ecn_bits; 5987 struct sockaddr_in src, dst; 5988 struct ip *ip; 5989 struct sctphdr *sh; 5990 struct sctp_chunkhdr *ch; 5991 int length, offset; 5992 5993#if !defined(SCTP_WITH_NO_CSUM) 5994 uint8_t compute_crc; 5995 5996#endif 5997 uint32_t mflowid; 5998 uint8_t use_mflowid; 5999 6000 iphlen = off; 6001 if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) { 6002 SCTP_RELEASE_PKT(i_pak); 6003 return; 6004 } 6005 m = SCTP_HEADER_TO_CHAIN(i_pak); 6006#ifdef SCTP_MBUF_LOGGING 6007 /* Log in any input mbufs */ 6008 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 6009 struct mbuf *mat; 6010 6011 for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) { 6012 if (SCTP_BUF_IS_EXTENDED(mat)) { 6013 sctp_log_mb(mat, SCTP_MBUF_INPUT); 6014 } 6015 } 6016 } 6017#endif 6018#ifdef SCTP_PACKET_LOGGING 6019 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) { 6020 sctp_packet_log(m); 6021 } 6022#endif 6023 SCTPDBG(SCTP_DEBUG_CRCOFFLOAD, 6024 "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n", 6025 m->m_pkthdr.len, 6026 if_name(m->m_pkthdr.rcvif), 6027 (int)m->m_pkthdr.csum_flags, CSUM_BITS); 6028 if (m->m_flags & M_FLOWID) { 6029 mflowid = m->m_pkthdr.flowid; 6030 use_mflowid = 1; 6031 } else { 6032 mflowid = 0; 6033 use_mflowid = 0; 6034 } 6035 SCTP_STAT_INCR(sctps_recvpackets); 6036 SCTP_STAT_INCR_COUNTER64(sctps_inpackets); 6037 /* Get IP, SCTP, and first chunk header together in the first mbuf. */ 6038 offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr); 6039 if (SCTP_BUF_LEN(m) < offset) { 6040 if ((m = m_pullup(m, offset)) == NULL) { 6041 SCTP_STAT_INCR(sctps_hdrops); 6042 return; 6043 } 6044 } 6045 ip = mtod(m, struct ip *); 6046 sh = (struct sctphdr *)((caddr_t)ip + iphlen); 6047 ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr)); 6048 offset -= sizeof(struct sctp_chunkhdr); 6049 memset(&src, 0, sizeof(struct sockaddr_in)); 6050 src.sin_family = AF_INET; 6051 src.sin_len = sizeof(struct sockaddr_in); 6052 src.sin_port = sh->src_port; 6053 src.sin_addr = ip->ip_src; 6054 memset(&dst, 0, sizeof(struct sockaddr_in)); 6055 dst.sin_family = AF_INET; 6056 dst.sin_len = sizeof(struct sockaddr_in); 6057 dst.sin_port = sh->dest_port; 6058 dst.sin_addr = ip->ip_dst; 6059 length = ntohs(ip->ip_len); 6060 /* Validate mbuf chain length with IP payload length. */ 6061 if (SCTP_HEADER_LEN(m) != length) { 6062 SCTPDBG(SCTP_DEBUG_INPUT1, 6063 "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m)); 6064 SCTP_STAT_INCR(sctps_hdrops); 6065 goto out; 6066 } 6067 /* SCTP does not allow broadcasts or multicasts */ 6068 if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) { 6069 goto out; 6070 } 6071 if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) { 6072 goto out; 6073 } 6074 ecn_bits = ip->ip_tos; 6075#if defined(SCTP_WITH_NO_CSUM) 6076 SCTP_STAT_INCR(sctps_recvnocrc); 6077#else 6078 if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) { 6079 SCTP_STAT_INCR(sctps_recvhwcrc); 6080 compute_crc = 0; 6081 } else { 6082 SCTP_STAT_INCR(sctps_recvswcrc); 6083 compute_crc = 1; 6084 } 6085#endif 6086 sctp_common_input_processing(&m, iphlen, offset, length, 6087 (struct sockaddr *)&src, 6088 (struct sockaddr *)&dst, 6089 sh, ch, 6090#if !defined(SCTP_WITH_NO_CSUM) 6091 compute_crc, 6092#endif 6093 ecn_bits, 6094 use_mflowid, mflowid, 6095 vrf_id, port); 6096out: 6097 if (m) { 6098 sctp_m_freem(m); 6099 } 6100 return; 6101} 6102 6103#if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP) 6104extern int *sctp_cpuarry; 6105 6106#endif 6107 6108void 6109sctp_input(struct mbuf *m, int off) 6110{ 6111#if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP) 6112 struct ip *ip; 6113 struct sctphdr *sh; 6114 int offset; 6115 int cpu_to_use; 6116 uint32_t flowid, tag; 6117 6118 if (mp_ncpus > 1) { 6119 if (m->m_flags & M_FLOWID) { 6120 flowid = m->m_pkthdr.flowid; 6121 } else { 6122 /* 6123 * No flow id built by lower layers fix it so we 6124 * create one. 6125 */ 6126 offset = off + sizeof(struct sctphdr); 6127 if (SCTP_BUF_LEN(m) < offset) { 6128 if ((m = m_pullup(m, offset)) == NULL) { 6129 SCTP_STAT_INCR(sctps_hdrops); 6130 return; 6131 } 6132 } 6133 ip = mtod(m, struct ip *); 6134 sh = (struct sctphdr *)((caddr_t)ip + off); 6135 tag = htonl(sh->v_tag); 6136 flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port); 6137 m->m_pkthdr.flowid = flowid; 6138 m->m_flags |= M_FLOWID; 6139 } 6140 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus]; 6141 sctp_queue_to_mcore(m, off, cpu_to_use); 6142 return; 6143 } 6144#endif 6145 sctp_input_with_port(m, off, 0); 6146} 6147 6148#endif 6149