sctp_input.c revision 298199
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 298199 2016-04-18 09:29:14Z 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, struct sctp_nets *net, int *abort_no_unlock, 89 uint8_t mflowtype, uint32_t mflowid, 90 uint32_t vrf_id, uint16_t port) 91{ 92 struct sctp_init *init; 93 struct mbuf *op_err; 94 95 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_init: handling INIT tcb:%p\n", 96 (void *)stcb); 97 if (stcb == NULL) { 98 SCTP_INP_RLOCK(inp); 99 } 100 /* validate length */ 101 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_chunk)) { 102 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 103 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 104 mflowtype, mflowid, 105 vrf_id, port); 106 if (stcb) 107 *abort_no_unlock = 1; 108 goto outnow; 109 } 110 /* validate parameters */ 111 init = &cp->init; 112 if (init->initiate_tag == 0) { 113 /* protocol error... send abort */ 114 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 115 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 116 mflowtype, mflowid, 117 vrf_id, port); 118 if (stcb) 119 *abort_no_unlock = 1; 120 goto outnow; 121 } 122 if (ntohl(init->a_rwnd) < SCTP_MIN_RWND) { 123 /* invalid parameter... send abort */ 124 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 125 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 126 mflowtype, mflowid, 127 vrf_id, port); 128 if (stcb) 129 *abort_no_unlock = 1; 130 goto outnow; 131 } 132 if (init->num_inbound_streams == 0) { 133 /* protocol error... send abort */ 134 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 135 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 136 mflowtype, mflowid, 137 vrf_id, port); 138 if (stcb) 139 *abort_no_unlock = 1; 140 goto outnow; 141 } 142 if (init->num_outbound_streams == 0) { 143 /* protocol error... send abort */ 144 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 145 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 146 mflowtype, mflowid, 147 vrf_id, port); 148 if (stcb) 149 *abort_no_unlock = 1; 150 goto outnow; 151 } 152 if (sctp_validate_init_auth_params(m, offset + sizeof(*cp), 153 offset + ntohs(cp->ch.chunk_length))) { 154 /* auth parameter(s) error... send abort */ 155 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 156 "Problem with AUTH parameters"); 157 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 158 mflowtype, mflowid, 159 vrf_id, port); 160 if (stcb) 161 *abort_no_unlock = 1; 162 goto outnow; 163 } 164 /* 165 * We are only accepting if we have a socket with positive 166 * so_qlimit. 167 */ 168 if ((stcb == NULL) && 169 ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 170 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) || 171 (inp->sctp_socket == NULL) || 172 (inp->sctp_socket->so_qlimit == 0))) { 173 /* 174 * FIX ME ?? What about TCP model and we have a 175 * match/restart case? Actually no fix is needed. the lookup 176 * will always find the existing assoc so stcb would not be 177 * NULL. It may be questionable to do this since we COULD 178 * just send back the INIT-ACK and hope that the app did 179 * accept()'s by the time the COOKIE was sent. But there is 180 * a price to pay for COOKIE generation and I don't want to 181 * pay it on the chance that the app will actually do some 182 * accepts(). The App just looses and should NOT be in this 183 * state :-) 184 */ 185 if (SCTP_BASE_SYSCTL(sctp_blackhole) == 0) { 186 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 187 "No listener"); 188 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err, 189 mflowtype, mflowid, inp->fibnum, 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, net, m, iphlen, offset, 202 src, dst, sh, cp, 203 mflowtype, mflowid, 204 vrf_id, port, 205 ((stcb == NULL) ? SCTP_HOLDS_LOCK : SCTP_NOT_LOCKED)); 206 } 207outnow: 208 if (stcb == NULL) { 209 SCTP_INP_RUNLOCK(inp); 210 } 211} 212 213/* 214 * process peer "INIT/INIT-ACK" chunk returns value < 0 on error 215 */ 216 217int 218sctp_is_there_unsent_data(struct sctp_tcb *stcb, int so_locked 219#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING) 220 SCTP_UNUSED 221#endif 222) 223{ 224 int unsent_data = 0; 225 unsigned int i; 226 struct sctp_stream_queue_pending *sp; 227 struct sctp_association *asoc; 228 229 /* 230 * This function returns the number of streams that have true unsent 231 * data on them. Note that as it looks through it will clean up any 232 * places that have old data that has been sent but left at top of 233 * stream queue. 234 */ 235 asoc = &stcb->asoc; 236 SCTP_TCB_SEND_LOCK(stcb); 237 if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 238 /* Check to see if some data queued */ 239 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 240 /* sa_ignore FREED_MEMORY */ 241 sp = TAILQ_FIRST(&stcb->asoc.strmout[i].outqueue); 242 if (sp == NULL) { 243 continue; 244 } 245 if ((sp->msg_is_complete) && 246 (sp->length == 0) && 247 (sp->sender_all_done)) { 248 /* 249 * We are doing differed cleanup. Last time 250 * through when we took all the data the 251 * sender_all_done was not set. 252 */ 253 if (sp->put_last_out == 0) { 254 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n"); 255 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n", 256 sp->sender_all_done, 257 sp->length, 258 sp->msg_is_complete, 259 sp->put_last_out); 260 } 261 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1); 262 TAILQ_REMOVE(&stcb->asoc.strmout[i].outqueue, sp, next); 263 if (sp->net) { 264 sctp_free_remote_addr(sp->net); 265 sp->net = NULL; 266 } 267 if (sp->data) { 268 sctp_m_freem(sp->data); 269 sp->data = NULL; 270 } 271 sctp_free_a_strmoq(stcb, sp, so_locked); 272 } else { 273 unsent_data++; 274 break; 275 } 276 } 277 } 278 SCTP_TCB_SEND_UNLOCK(stcb); 279 return (unsent_data); 280} 281 282static int 283sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb) 284{ 285 struct sctp_init *init; 286 struct sctp_association *asoc; 287 struct sctp_nets *lnet; 288 unsigned int i; 289 290 init = &cp->init; 291 asoc = &stcb->asoc; 292 /* save off parameters */ 293 asoc->peer_vtag = ntohl(init->initiate_tag); 294 asoc->peers_rwnd = ntohl(init->a_rwnd); 295 /* init tsn's */ 296 asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1; 297 298 if (!TAILQ_EMPTY(&asoc->nets)) { 299 /* update any ssthresh's that may have a default */ 300 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) { 301 lnet->ssthresh = asoc->peers_rwnd; 302 if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) { 303 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION); 304 } 305 } 306 } 307 SCTP_TCB_SEND_LOCK(stcb); 308 if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) { 309 unsigned int newcnt; 310 struct sctp_stream_out *outs; 311 struct sctp_stream_queue_pending *sp, *nsp; 312 struct sctp_tmit_chunk *chk, *nchk; 313 314 /* abandon the upper streams */ 315 newcnt = ntohs(init->num_inbound_streams); 316 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) { 317 if (chk->rec.data.stream_number >= newcnt) { 318 TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next); 319 asoc->send_queue_cnt--; 320 if (asoc->strmout[chk->rec.data.stream_number].chunks_on_queues > 0) { 321 asoc->strmout[chk->rec.data.stream_number].chunks_on_queues--; 322#ifdef INVARIANTS 323 } else { 324 panic("No chunks on the queues for sid %u.", chk->rec.data.stream_number); 325#endif 326 } 327 if (chk->data != NULL) { 328 sctp_free_bufspace(stcb, asoc, chk, 1); 329 sctp_ulp_notify(SCTP_NOTIFY_UNSENT_DG_FAIL, stcb, 330 0, chk, SCTP_SO_NOT_LOCKED); 331 if (chk->data) { 332 sctp_m_freem(chk->data); 333 chk->data = NULL; 334 } 335 } 336 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 337 /* sa_ignore FREED_MEMORY */ 338 } 339 } 340 if (asoc->strmout) { 341 for (i = newcnt; i < asoc->pre_open_streams; i++) { 342 outs = &asoc->strmout[i]; 343 TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) { 344 TAILQ_REMOVE(&outs->outqueue, sp, next); 345 asoc->stream_queue_cnt--; 346 sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL, 347 stcb, 0, sp, SCTP_SO_NOT_LOCKED); 348 if (sp->data) { 349 sctp_m_freem(sp->data); 350 sp->data = NULL; 351 } 352 if (sp->net) { 353 sctp_free_remote_addr(sp->net); 354 sp->net = NULL; 355 } 356 /* Free the chunk */ 357 sctp_free_a_strmoq(stcb, sp, SCTP_SO_NOT_LOCKED); 358 /* sa_ignore FREED_MEMORY */ 359 } 360 outs->state = SCTP_STREAM_CLOSED; 361 } 362 } 363 /* cut back the count */ 364 asoc->pre_open_streams = newcnt; 365 } 366 SCTP_TCB_SEND_UNLOCK(stcb); 367 asoc->streamoutcnt = asoc->pre_open_streams; 368 if (asoc->strmout) { 369 for (i = 0; i < asoc->streamoutcnt; i++) { 370 asoc->strmout[i].state = SCTP_STREAM_OPEN; 371 } 372 } 373 /* EY - nr_sack: initialize highest tsn in nr_mapping_array */ 374 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 375 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 376 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 377 } 378 /* This is the next one we expect */ 379 asoc->str_reset_seq_in = asoc->asconf_seq_in + 1; 380 381 asoc->mapping_array_base_tsn = ntohl(init->initial_tsn); 382 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in; 383 384 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 385 /* open the requested streams */ 386 387 if (asoc->strmin != NULL) { 388 /* Free the old ones */ 389 for (i = 0; i < asoc->streamincnt; i++) { 390 sctp_clean_up_stream(stcb, &asoc->strmin[i].inqueue); 391 sctp_clean_up_stream(stcb, &asoc->strmin[i].uno_inqueue); 392 } 393 SCTP_FREE(asoc->strmin, SCTP_M_STRMI); 394 } 395 if (asoc->max_inbound_streams > ntohs(init->num_outbound_streams)) { 396 asoc->streamincnt = ntohs(init->num_outbound_streams); 397 } else { 398 asoc->streamincnt = asoc->max_inbound_streams; 399 } 400 SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt * 401 sizeof(struct sctp_stream_in), SCTP_M_STRMI); 402 if (asoc->strmin == NULL) { 403 /* we didn't get memory for the streams! */ 404 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n"); 405 return (-1); 406 } 407 for (i = 0; i < asoc->streamincnt; i++) { 408 asoc->strmin[i].stream_no = i; 409 asoc->strmin[i].last_sequence_delivered = 0xffffffff; 410 TAILQ_INIT(&asoc->strmin[i].inqueue); 411 TAILQ_INIT(&asoc->strmin[i].uno_inqueue); 412 asoc->strmin[i].pd_api_started = 0; 413 asoc->strmin[i].delivery_started = 0; 414 } 415 /* 416 * load_address_from_init will put the addresses into the 417 * association when the COOKIE is processed or the INIT-ACK is 418 * processed. Both types of COOKIE's existing and new call this 419 * routine. It will remove addresses that are no longer in the 420 * association (for the restarting case where addresses are 421 * removed). Up front when the INIT arrives we will discard it if it 422 * is a restart and new addresses have been added. 423 */ 424 /* sa_ignore MEMLEAK */ 425 return (0); 426} 427 428/* 429 * INIT-ACK message processing/consumption returns value < 0 on error 430 */ 431static int 432sctp_process_init_ack(struct mbuf *m, int iphlen, int offset, 433 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 434 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 435 struct sctp_nets *net, int *abort_no_unlock, 436 uint8_t mflowtype, uint32_t mflowid, 437 uint32_t vrf_id) 438{ 439 struct sctp_association *asoc; 440 struct mbuf *op_err; 441 int retval, abort_flag; 442 uint32_t initack_limit; 443 int nat_friendly = 0; 444 445 /* First verify that we have no illegal param's */ 446 abort_flag = 0; 447 448 op_err = sctp_arethere_unrecognized_parameters(m, 449 (offset + sizeof(struct sctp_init_chunk)), 450 &abort_flag, (struct sctp_chunkhdr *)cp, &nat_friendly); 451 if (abort_flag) { 452 /* Send an abort and notify peer */ 453 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 454 *abort_no_unlock = 1; 455 return (-1); 456 } 457 asoc = &stcb->asoc; 458 asoc->peer_supports_nat = (uint8_t) nat_friendly; 459 /* process the peer's parameters in the INIT-ACK */ 460 retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb); 461 if (retval < 0) { 462 return (retval); 463 } 464 initack_limit = offset + ntohs(cp->ch.chunk_length); 465 /* load all addresses */ 466 if ((retval = sctp_load_addresses_from_init(stcb, m, 467 (offset + sizeof(struct sctp_init_chunk)), initack_limit, 468 src, dst, NULL))) { 469 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 470 "Problem with address parameters"); 471 SCTPDBG(SCTP_DEBUG_INPUT1, 472 "Load addresses from INIT causes an abort %d\n", 473 retval); 474 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 475 src, dst, sh, op_err, 476 mflowtype, mflowid, 477 vrf_id, net->port); 478 *abort_no_unlock = 1; 479 return (-1); 480 } 481 /* if the peer doesn't support asconf, flush the asconf queue */ 482 if (asoc->asconf_supported == 0) { 483 struct sctp_asconf_addr *param, *nparam; 484 485 TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) { 486 TAILQ_REMOVE(&asoc->asconf_queue, param, next); 487 SCTP_FREE(param, SCTP_M_ASC_ADDR); 488 } 489 } 490 stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs, 491 stcb->asoc.local_hmacs); 492 if (op_err) { 493 sctp_queue_op_err(stcb, op_err); 494 /* queuing will steal away the mbuf chain to the out queue */ 495 op_err = NULL; 496 } 497 /* extract the cookie and queue it to "echo" it back... */ 498 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 499 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 500 stcb->asoc.overall_error_count, 501 0, 502 SCTP_FROM_SCTP_INPUT, 503 __LINE__); 504 } 505 stcb->asoc.overall_error_count = 0; 506 net->error_count = 0; 507 508 /* 509 * Cancel the INIT timer, We do this first before queueing the 510 * cookie. We always cancel at the primary to assue that we are 511 * canceling the timer started by the INIT which always goes to the 512 * primary. 513 */ 514 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb, 515 asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3); 516 517 /* calculate the RTO */ 518 net->RTO = sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, sctp_align_safe_nocopy, 519 SCTP_RTT_FROM_NON_DATA); 520 retval = sctp_send_cookie_echo(m, offset, stcb, net); 521 if (retval < 0) { 522 /* 523 * No cookie, we probably should send a op error. But in any 524 * case if there is no cookie in the INIT-ACK, we can 525 * abandon the peer, its broke. 526 */ 527 if (retval == -3) { 528 uint16_t len; 529 530 len = (uint16_t) (sizeof(struct sctp_error_missing_param) + sizeof(uint16_t)); 531 /* We abort with an error of missing mandatory param */ 532 op_err = sctp_get_mbuf_for_msg(len, 0, M_NOWAIT, 1, MT_DATA); 533 if (op_err != NULL) { 534 struct sctp_error_missing_param *cause; 535 536 SCTP_BUF_LEN(op_err) = len; 537 cause = mtod(op_err, struct sctp_error_missing_param *); 538 /* Subtract the reserved param */ 539 cause->cause.code = htons(SCTP_CAUSE_MISSING_PARAM); 540 cause->cause.length = htons(len); 541 cause->num_missing_params = htonl(1); 542 cause->type[0] = htons(SCTP_STATE_COOKIE); 543 } 544 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 545 src, dst, sh, op_err, 546 mflowtype, mflowid, 547 vrf_id, net->port); 548 *abort_no_unlock = 1; 549 } 550 return (retval); 551 } 552 return (0); 553} 554 555static void 556sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp, 557 struct sctp_tcb *stcb, struct sctp_nets *net) 558{ 559 union sctp_sockstore store; 560 struct sctp_nets *r_net, *f_net; 561 struct timeval tv; 562 int req_prim = 0; 563 uint16_t old_error_counter; 564 565 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) { 566 /* Invalid length */ 567 return; 568 } 569 memset(&store, 0, sizeof(store)); 570 switch (cp->heartbeat.hb_info.addr_family) { 571#ifdef INET 572 case AF_INET: 573 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) { 574 store.sin.sin_family = cp->heartbeat.hb_info.addr_family; 575 store.sin.sin_len = cp->heartbeat.hb_info.addr_len; 576 store.sin.sin_port = stcb->rport; 577 memcpy(&store.sin.sin_addr, cp->heartbeat.hb_info.address, 578 sizeof(store.sin.sin_addr)); 579 } else { 580 return; 581 } 582 break; 583#endif 584#ifdef INET6 585 case AF_INET6: 586 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) { 587 store.sin6.sin6_family = cp->heartbeat.hb_info.addr_family; 588 store.sin6.sin6_len = cp->heartbeat.hb_info.addr_len; 589 store.sin6.sin6_port = stcb->rport; 590 memcpy(&store.sin6.sin6_addr, cp->heartbeat.hb_info.address, sizeof(struct in6_addr)); 591 } else { 592 return; 593 } 594 break; 595#endif 596 default: 597 return; 598 } 599 r_net = sctp_findnet(stcb, &store.sa); 600 if (r_net == NULL) { 601 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n"); 602 return; 603 } 604 if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) && 605 (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) && 606 (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) { 607 /* 608 * If the its a HB and it's random value is correct when can 609 * confirm the destination. 610 */ 611 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 612 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) { 613 stcb->asoc.primary_destination = r_net; 614 r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY; 615 f_net = TAILQ_FIRST(&stcb->asoc.nets); 616 if (f_net != r_net) { 617 /* 618 * first one on the list is NOT the primary 619 * sctp_cmpaddr() is much more efficent if 620 * the primary is the first on the list, 621 * make it so. 622 */ 623 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next); 624 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next); 625 } 626 req_prim = 1; 627 } 628 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 629 stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 630 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, 631 r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4); 632 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 633 } 634 old_error_counter = r_net->error_count; 635 r_net->error_count = 0; 636 r_net->hb_responded = 1; 637 tv.tv_sec = cp->heartbeat.hb_info.time_value_1; 638 tv.tv_usec = cp->heartbeat.hb_info.time_value_2; 639 /* Now lets do a RTO with this */ 640 r_net->RTO = sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, sctp_align_safe_nocopy, 641 SCTP_RTT_FROM_NON_DATA); 642 if (!(r_net->dest_state & SCTP_ADDR_REACHABLE)) { 643 r_net->dest_state |= SCTP_ADDR_REACHABLE; 644 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb, 645 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 646 } 647 if (r_net->dest_state & SCTP_ADDR_PF) { 648 r_net->dest_state &= ~SCTP_ADDR_PF; 649 stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net); 650 } 651 if (old_error_counter > 0) { 652 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 653 stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_5); 654 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 655 } 656 if (r_net == stcb->asoc.primary_destination) { 657 if (stcb->asoc.alternate) { 658 /* release the alternate, primary is good */ 659 sctp_free_remote_addr(stcb->asoc.alternate); 660 stcb->asoc.alternate = NULL; 661 } 662 } 663 /* Mobility adaptation */ 664 if (req_prim) { 665 if ((sctp_is_mobility_feature_on(stcb->sctp_ep, 666 SCTP_MOBILITY_BASE) || 667 sctp_is_mobility_feature_on(stcb->sctp_ep, 668 SCTP_MOBILITY_FASTHANDOFF)) && 669 sctp_is_mobility_feature_on(stcb->sctp_ep, 670 SCTP_MOBILITY_PRIM_DELETED)) { 671 672 sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED, 673 stcb->sctp_ep, stcb, NULL, 674 SCTP_FROM_SCTP_INPUT + SCTP_LOC_6); 675 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 676 SCTP_MOBILITY_FASTHANDOFF)) { 677 sctp_assoc_immediate_retrans(stcb, 678 stcb->asoc.primary_destination); 679 } 680 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 681 SCTP_MOBILITY_BASE)) { 682 sctp_move_chunks_from_net(stcb, 683 stcb->asoc.deleted_primary); 684 } 685 sctp_delete_prim_timer(stcb->sctp_ep, stcb, 686 stcb->asoc.deleted_primary); 687 } 688 } 689} 690 691static int 692sctp_handle_nat_colliding_state(struct sctp_tcb *stcb) 693{ 694 /* 695 * return 0 means we want you to proceed with the abort non-zero 696 * means no abort processing 697 */ 698 struct sctpasochead *head; 699 700 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_WAIT) { 701 /* generate a new vtag and send init */ 702 LIST_REMOVE(stcb, sctp_asocs); 703 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 704 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 705 /* 706 * put it in the bucket in the vtag hash of assoc's for the 707 * system 708 */ 709 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 710 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 711 return (1); 712 } 713 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) { 714 /* 715 * treat like a case where the cookie expired i.e.: - dump 716 * current cookie. - generate a new vtag. - resend init. 717 */ 718 /* generate a new vtag and send init */ 719 LIST_REMOVE(stcb, sctp_asocs); 720 stcb->asoc.state &= ~SCTP_STATE_COOKIE_ECHOED; 721 stcb->asoc.state |= SCTP_STATE_COOKIE_WAIT; 722 sctp_stop_all_cookie_timers(stcb); 723 sctp_toss_old_cookies(stcb, &stcb->asoc); 724 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 725 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 726 /* 727 * put it in the bucket in the vtag hash of assoc's for the 728 * system 729 */ 730 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 731 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 732 return (1); 733 } 734 return (0); 735} 736 737static int 738sctp_handle_nat_missing_state(struct sctp_tcb *stcb, 739 struct sctp_nets *net) 740{ 741 /* 742 * return 0 means we want you to proceed with the abort non-zero 743 * means no abort processing 744 */ 745 if (stcb->asoc.auth_supported == 0) { 746 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n"); 747 return (0); 748 } 749 sctp_asconf_send_nat_state_update(stcb, net); 750 return (1); 751} 752 753 754static void 755sctp_handle_abort(struct sctp_abort_chunk *abort, 756 struct sctp_tcb *stcb, struct sctp_nets *net) 757{ 758#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 759 struct socket *so; 760 761#endif 762 uint16_t len; 763 uint16_t error; 764 765 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n"); 766 if (stcb == NULL) 767 return; 768 769 len = ntohs(abort->ch.chunk_length); 770 if (len > sizeof(struct sctp_chunkhdr)) { 771 /* 772 * Need to check the cause codes for our two magic nat 773 * aborts which don't kill the assoc necessarily. 774 */ 775 struct sctp_gen_error_cause *cause; 776 777 cause = (struct sctp_gen_error_cause *)(abort + 1); 778 error = ntohs(cause->code); 779 if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) { 780 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n", 781 abort->ch.chunk_flags); 782 if (sctp_handle_nat_colliding_state(stcb)) { 783 return; 784 } 785 } else if (error == SCTP_CAUSE_NAT_MISSING_STATE) { 786 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n", 787 abort->ch.chunk_flags); 788 if (sctp_handle_nat_missing_state(stcb, net)) { 789 return; 790 } 791 } 792 } else { 793 error = 0; 794 } 795 /* stop any receive timers */ 796 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net, 797 SCTP_FROM_SCTP_INPUT + SCTP_LOC_7); 798 /* notify user of the abort and clean up... */ 799 sctp_abort_notification(stcb, 1, error, abort, SCTP_SO_NOT_LOCKED); 800 /* free the tcb */ 801 SCTP_STAT_INCR_COUNTER32(sctps_aborted); 802 if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) || 803 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 804 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 805 } 806#ifdef SCTP_ASOCLOG_OF_TSNS 807 sctp_print_out_track_log(stcb); 808#endif 809#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 810 so = SCTP_INP_SO(stcb->sctp_ep); 811 atomic_add_int(&stcb->asoc.refcnt, 1); 812 SCTP_TCB_UNLOCK(stcb); 813 SCTP_SOCKET_LOCK(so, 1); 814 SCTP_TCB_LOCK(stcb); 815 atomic_subtract_int(&stcb->asoc.refcnt, 1); 816#endif 817 stcb->asoc.state |= SCTP_STATE_WAS_ABORTED; 818 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 819 SCTP_FROM_SCTP_INPUT + SCTP_LOC_8); 820#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 821 SCTP_SOCKET_UNLOCK(so, 1); 822#endif 823 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n"); 824} 825 826static void 827sctp_start_net_timers(struct sctp_tcb *stcb) 828{ 829 uint32_t cnt_hb_sent; 830 struct sctp_nets *net; 831 832 cnt_hb_sent = 0; 833 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 834 /* 835 * For each network start: 1) A pmtu timer. 2) A HB timer 3) 836 * If the dest in unconfirmed send a hb as well if under 837 * max_hb_burst have been sent. 838 */ 839 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net); 840 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net); 841 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) && 842 (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) { 843 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 844 cnt_hb_sent++; 845 } 846 } 847 if (cnt_hb_sent) { 848 sctp_chunk_output(stcb->sctp_ep, stcb, 849 SCTP_OUTPUT_FROM_COOKIE_ACK, 850 SCTP_SO_NOT_LOCKED); 851 } 852} 853 854 855static void 856sctp_handle_shutdown(struct sctp_shutdown_chunk *cp, 857 struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag) 858{ 859 struct sctp_association *asoc; 860 int some_on_streamwheel; 861 int old_state; 862 863#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 864 struct socket *so; 865 866#endif 867 868 SCTPDBG(SCTP_DEBUG_INPUT2, 869 "sctp_handle_shutdown: handling SHUTDOWN\n"); 870 if (stcb == NULL) 871 return; 872 asoc = &stcb->asoc; 873 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) || 874 (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) { 875 return; 876 } 877 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) { 878 /* Shutdown NOT the expected size */ 879 return; 880 } 881 old_state = SCTP_GET_STATE(asoc); 882 sctp_update_acked(stcb, cp, abort_flag); 883 if (*abort_flag) { 884 return; 885 } 886 if (asoc->control_pdapi) { 887 /* 888 * With a normal shutdown we assume the end of last record. 889 */ 890 SCTP_INP_READ_LOCK(stcb->sctp_ep); 891 if (asoc->control_pdapi->on_strm_q) { 892 struct sctp_stream_in *strm; 893 894 strm = &asoc->strmin[asoc->control_pdapi->sinfo_stream]; 895 if (asoc->control_pdapi->on_strm_q == SCTP_ON_UNORDERED) { 896 /* Unordered */ 897 TAILQ_REMOVE(&strm->uno_inqueue, asoc->control_pdapi, next_instrm); 898 asoc->control_pdapi->on_strm_q = 0; 899 } else if (asoc->control_pdapi->on_strm_q == SCTP_ON_ORDERED) { 900 /* Ordered */ 901 TAILQ_REMOVE(&strm->inqueue, asoc->control_pdapi, next_instrm); 902 asoc->control_pdapi->on_strm_q = 0; 903#ifdef INVARIANTS 904 } else { 905 panic("Unknown state on ctrl:%p on_strm_q:%d", 906 asoc->control_pdapi, 907 asoc->control_pdapi->on_strm_q); 908#endif 909 } 910 } 911 asoc->control_pdapi->end_added = 1; 912 asoc->control_pdapi->pdapi_aborted = 1; 913 asoc->control_pdapi = NULL; 914 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 915#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 916 so = SCTP_INP_SO(stcb->sctp_ep); 917 atomic_add_int(&stcb->asoc.refcnt, 1); 918 SCTP_TCB_UNLOCK(stcb); 919 SCTP_SOCKET_LOCK(so, 1); 920 SCTP_TCB_LOCK(stcb); 921 atomic_subtract_int(&stcb->asoc.refcnt, 1); 922 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 923 /* assoc was freed while we were unlocked */ 924 SCTP_SOCKET_UNLOCK(so, 1); 925 return; 926 } 927#endif 928 if (stcb->sctp_socket) { 929 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 930 } 931#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 932 SCTP_SOCKET_UNLOCK(so, 1); 933#endif 934 } 935 /* goto SHUTDOWN_RECEIVED state to block new requests */ 936 if (stcb->sctp_socket) { 937 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) && 938 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) && 939 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) { 940 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_RECEIVED); 941 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 942 /* 943 * notify upper layer that peer has initiated a 944 * shutdown 945 */ 946 sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 947 948 /* reset time */ 949 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 950 } 951 } 952 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) { 953 /* 954 * stop the shutdown timer, since we WILL move to 955 * SHUTDOWN-ACK-SENT. 956 */ 957 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, 958 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9); 959 } 960 /* Now is there unsent data on a stream somewhere? */ 961 some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED); 962 963 if (!TAILQ_EMPTY(&asoc->send_queue) || 964 !TAILQ_EMPTY(&asoc->sent_queue) || 965 some_on_streamwheel) { 966 /* By returning we will push more data out */ 967 return; 968 } else { 969 /* no outstanding data to send, so move on... */ 970 /* send SHUTDOWN-ACK */ 971 /* move to SHUTDOWN-ACK-SENT state */ 972 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) || 973 (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 974 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 975 } 976 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 977 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 978 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT); 979 sctp_stop_timers_for_shutdown(stcb); 980 sctp_send_shutdown_ack(stcb, net); 981 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, 982 stcb->sctp_ep, stcb, net); 983 } else if (old_state == SCTP_STATE_SHUTDOWN_ACK_SENT) { 984 sctp_send_shutdown_ack(stcb, net); 985 } 986 } 987} 988 989static void 990sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED, 991 struct sctp_tcb *stcb, 992 struct sctp_nets *net) 993{ 994 struct sctp_association *asoc; 995 996#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 997 struct socket *so; 998 999 so = SCTP_INP_SO(stcb->sctp_ep); 1000#endif 1001 SCTPDBG(SCTP_DEBUG_INPUT2, 1002 "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n"); 1003 if (stcb == NULL) 1004 return; 1005 1006 asoc = &stcb->asoc; 1007 /* process according to association state */ 1008 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) || 1009 (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) { 1010 /* unexpected SHUTDOWN-ACK... do OOTB handling... */ 1011 sctp_send_shutdown_complete(stcb, net, 1); 1012 SCTP_TCB_UNLOCK(stcb); 1013 return; 1014 } 1015 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) && 1016 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) { 1017 /* unexpected SHUTDOWN-ACK... so ignore... */ 1018 SCTP_TCB_UNLOCK(stcb); 1019 return; 1020 } 1021 if (asoc->control_pdapi) { 1022 /* 1023 * With a normal shutdown we assume the end of last record. 1024 */ 1025 SCTP_INP_READ_LOCK(stcb->sctp_ep); 1026 asoc->control_pdapi->end_added = 1; 1027 asoc->control_pdapi->pdapi_aborted = 1; 1028 asoc->control_pdapi = NULL; 1029 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 1030#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1031 atomic_add_int(&stcb->asoc.refcnt, 1); 1032 SCTP_TCB_UNLOCK(stcb); 1033 SCTP_SOCKET_LOCK(so, 1); 1034 SCTP_TCB_LOCK(stcb); 1035 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1036 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1037 /* assoc was freed while we were unlocked */ 1038 SCTP_SOCKET_UNLOCK(so, 1); 1039 return; 1040 } 1041#endif 1042 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 1043#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1044 SCTP_SOCKET_UNLOCK(so, 1); 1045#endif 1046 } 1047#ifdef INVARIANTS 1048 if (!TAILQ_EMPTY(&asoc->send_queue) || 1049 !TAILQ_EMPTY(&asoc->sent_queue) || 1050 !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 1051 panic("Queues are not empty when handling SHUTDOWN-ACK"); 1052 } 1053#endif 1054 /* stop the timer */ 1055 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, 1056 SCTP_FROM_SCTP_INPUT + SCTP_LOC_10); 1057 /* send SHUTDOWN-COMPLETE */ 1058 sctp_send_shutdown_complete(stcb, net, 0); 1059 /* notify upper layer protocol */ 1060 if (stcb->sctp_socket) { 1061 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1062 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 1063 stcb->sctp_socket->so_snd.sb_cc = 0; 1064 } 1065 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 1066 } 1067 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 1068 /* free the TCB but first save off the ep */ 1069#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1070 atomic_add_int(&stcb->asoc.refcnt, 1); 1071 SCTP_TCB_UNLOCK(stcb); 1072 SCTP_SOCKET_LOCK(so, 1); 1073 SCTP_TCB_LOCK(stcb); 1074 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1075#endif 1076 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1077 SCTP_FROM_SCTP_INPUT + SCTP_LOC_11); 1078#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1079 SCTP_SOCKET_UNLOCK(so, 1); 1080#endif 1081} 1082 1083/* 1084 * Skip past the param header and then we will find the chunk that caused the 1085 * problem. There are two possiblities ASCONF or FWD-TSN other than that and 1086 * our peer must be broken. 1087 */ 1088static void 1089sctp_process_unrecog_chunk(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr, 1090 struct sctp_nets *net) 1091{ 1092 struct sctp_chunkhdr *chk; 1093 1094 chk = (struct sctp_chunkhdr *)((caddr_t)phdr + sizeof(*phdr)); 1095 switch (chk->chunk_type) { 1096 case SCTP_ASCONF_ACK: 1097 case SCTP_ASCONF: 1098 sctp_asconf_cleanup(stcb, net); 1099 break; 1100 case SCTP_IFORWARD_CUM_TSN: 1101 case SCTP_FORWARD_CUM_TSN: 1102 stcb->asoc.prsctp_supported = 0; 1103 break; 1104 default: 1105 SCTPDBG(SCTP_DEBUG_INPUT2, 1106 "Peer does not support chunk type %d(%x)??\n", 1107 chk->chunk_type, (uint32_t) chk->chunk_type); 1108 break; 1109 } 1110} 1111 1112/* 1113 * Skip past the param header and then we will find the param that caused the 1114 * problem. There are a number of param's in a ASCONF OR the prsctp param 1115 * these will turn of specific features. 1116 * XXX: Is this the right thing to do? 1117 */ 1118static void 1119sctp_process_unrecog_param(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr) 1120{ 1121 struct sctp_paramhdr *pbad; 1122 1123 pbad = phdr + 1; 1124 switch (ntohs(pbad->param_type)) { 1125 /* pr-sctp draft */ 1126 case SCTP_PRSCTP_SUPPORTED: 1127 stcb->asoc.prsctp_supported = 0; 1128 break; 1129 case SCTP_SUPPORTED_CHUNK_EXT: 1130 break; 1131 /* draft-ietf-tsvwg-addip-sctp */ 1132 case SCTP_HAS_NAT_SUPPORT: 1133 stcb->asoc.peer_supports_nat = 0; 1134 break; 1135 case SCTP_ADD_IP_ADDRESS: 1136 case SCTP_DEL_IP_ADDRESS: 1137 case SCTP_SET_PRIM_ADDR: 1138 stcb->asoc.asconf_supported = 0; 1139 break; 1140 case SCTP_SUCCESS_REPORT: 1141 case SCTP_ERROR_CAUSE_IND: 1142 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n"); 1143 SCTPDBG(SCTP_DEBUG_INPUT2, 1144 "Turning off ASCONF to this strange peer\n"); 1145 stcb->asoc.asconf_supported = 0; 1146 break; 1147 default: 1148 SCTPDBG(SCTP_DEBUG_INPUT2, 1149 "Peer does not support param type %d(%x)??\n", 1150 pbad->param_type, (uint32_t) pbad->param_type); 1151 break; 1152 } 1153} 1154 1155static int 1156sctp_handle_error(struct sctp_chunkhdr *ch, 1157 struct sctp_tcb *stcb, struct sctp_nets *net) 1158{ 1159 int chklen; 1160 struct sctp_paramhdr *phdr; 1161 uint16_t error, error_type; 1162 uint16_t error_len; 1163 struct sctp_association *asoc; 1164 int adjust; 1165 1166#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1167 struct socket *so; 1168 1169#endif 1170 1171 /* parse through all of the errors and process */ 1172 asoc = &stcb->asoc; 1173 phdr = (struct sctp_paramhdr *)((caddr_t)ch + 1174 sizeof(struct sctp_chunkhdr)); 1175 chklen = ntohs(ch->chunk_length) - sizeof(struct sctp_chunkhdr); 1176 error = 0; 1177 while ((size_t)chklen >= sizeof(struct sctp_paramhdr)) { 1178 /* Process an Error Cause */ 1179 error_type = ntohs(phdr->param_type); 1180 error_len = ntohs(phdr->param_length); 1181 if ((error_len > chklen) || (error_len == 0)) { 1182 /* invalid param length for this param */ 1183 SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in error param- chunk left:%d errorlen:%d\n", 1184 chklen, error_len); 1185 return (0); 1186 } 1187 if (error == 0) { 1188 /* report the first error cause */ 1189 error = error_type; 1190 } 1191 switch (error_type) { 1192 case SCTP_CAUSE_INVALID_STREAM: 1193 case SCTP_CAUSE_MISSING_PARAM: 1194 case SCTP_CAUSE_INVALID_PARAM: 1195 case SCTP_CAUSE_NO_USER_DATA: 1196 SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %d back? We have a bug :/ (or do they?)\n", 1197 error_type); 1198 break; 1199 case SCTP_CAUSE_NAT_COLLIDING_STATE: 1200 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n", 1201 ch->chunk_flags); 1202 if (sctp_handle_nat_colliding_state(stcb)) { 1203 return (0); 1204 } 1205 break; 1206 case SCTP_CAUSE_NAT_MISSING_STATE: 1207 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n", 1208 ch->chunk_flags); 1209 if (sctp_handle_nat_missing_state(stcb, net)) { 1210 return (0); 1211 } 1212 break; 1213 case SCTP_CAUSE_STALE_COOKIE: 1214 /* 1215 * We only act if we have echoed a cookie and are 1216 * waiting. 1217 */ 1218 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) { 1219 int *p; 1220 1221 p = (int *)((caddr_t)phdr + sizeof(*phdr)); 1222 /* Save the time doubled */ 1223 asoc->cookie_preserve_req = ntohl(*p) << 1; 1224 asoc->stale_cookie_count++; 1225 if (asoc->stale_cookie_count > 1226 asoc->max_init_times) { 1227 sctp_abort_notification(stcb, 0, 0, NULL, SCTP_SO_NOT_LOCKED); 1228 /* now free the asoc */ 1229#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1230 so = SCTP_INP_SO(stcb->sctp_ep); 1231 atomic_add_int(&stcb->asoc.refcnt, 1); 1232 SCTP_TCB_UNLOCK(stcb); 1233 SCTP_SOCKET_LOCK(so, 1); 1234 SCTP_TCB_LOCK(stcb); 1235 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1236#endif 1237 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1238 SCTP_FROM_SCTP_INPUT + SCTP_LOC_12); 1239#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1240 SCTP_SOCKET_UNLOCK(so, 1); 1241#endif 1242 return (-1); 1243 } 1244 /* blast back to INIT state */ 1245 sctp_toss_old_cookies(stcb, &stcb->asoc); 1246 asoc->state &= ~SCTP_STATE_COOKIE_ECHOED; 1247 asoc->state |= SCTP_STATE_COOKIE_WAIT; 1248 sctp_stop_all_cookie_timers(stcb); 1249 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 1250 } 1251 break; 1252 case SCTP_CAUSE_UNRESOLVABLE_ADDR: 1253 /* 1254 * Nothing we can do here, we don't do hostname 1255 * addresses so if the peer does not like my IPv6 1256 * (or IPv4 for that matter) it does not matter. If 1257 * they don't support that type of address, they can 1258 * NOT possibly get that packet type... i.e. with no 1259 * IPv6 you can't recieve a IPv6 packet. so we can 1260 * safely ignore this one. If we ever added support 1261 * for HOSTNAME Addresses, then we would need to do 1262 * something here. 1263 */ 1264 break; 1265 case SCTP_CAUSE_UNRECOG_CHUNK: 1266 sctp_process_unrecog_chunk(stcb, phdr, net); 1267 break; 1268 case SCTP_CAUSE_UNRECOG_PARAM: 1269 sctp_process_unrecog_param(stcb, phdr); 1270 break; 1271 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN: 1272 /* 1273 * We ignore this since the timer will drive out a 1274 * new cookie anyway and there timer will drive us 1275 * to send a SHUTDOWN_COMPLETE. We can't send one 1276 * here since we don't have their tag. 1277 */ 1278 break; 1279 case SCTP_CAUSE_DELETING_LAST_ADDR: 1280 case SCTP_CAUSE_RESOURCE_SHORTAGE: 1281 case SCTP_CAUSE_DELETING_SRC_ADDR: 1282 /* 1283 * We should NOT get these here, but in a 1284 * ASCONF-ACK. 1285 */ 1286 SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a Operational Error?<%d>?\n", 1287 error_type); 1288 break; 1289 case SCTP_CAUSE_OUT_OF_RESC: 1290 /* 1291 * And what, pray tell do we do with the fact that 1292 * the peer is out of resources? Not really sure we 1293 * could do anything but abort. I suspect this 1294 * should have came WITH an abort instead of in a 1295 * OP-ERROR. 1296 */ 1297 break; 1298 default: 1299 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown error type = 0x%xh\n", 1300 error_type); 1301 break; 1302 } 1303 adjust = SCTP_SIZE32(error_len); 1304 chklen -= adjust; 1305 phdr = (struct sctp_paramhdr *)((caddr_t)phdr + adjust); 1306 } 1307 sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, error, ch, SCTP_SO_NOT_LOCKED); 1308 return (0); 1309} 1310 1311static int 1312sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset, 1313 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 1314 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 1315 struct sctp_nets *net, int *abort_no_unlock, 1316 uint8_t mflowtype, uint32_t mflowid, 1317 uint32_t vrf_id) 1318{ 1319 struct sctp_init_ack *init_ack; 1320 struct mbuf *op_err; 1321 1322 SCTPDBG(SCTP_DEBUG_INPUT2, 1323 "sctp_handle_init_ack: handling INIT-ACK\n"); 1324 1325 if (stcb == NULL) { 1326 SCTPDBG(SCTP_DEBUG_INPUT2, 1327 "sctp_handle_init_ack: TCB is null\n"); 1328 return (-1); 1329 } 1330 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) { 1331 /* Invalid length */ 1332 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1333 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1334 src, dst, sh, op_err, 1335 mflowtype, mflowid, 1336 vrf_id, net->port); 1337 *abort_no_unlock = 1; 1338 return (-1); 1339 } 1340 init_ack = &cp->init; 1341 /* validate parameters */ 1342 if (init_ack->initiate_tag == 0) { 1343 /* protocol error... send an abort */ 1344 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1345 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1346 src, dst, sh, op_err, 1347 mflowtype, mflowid, 1348 vrf_id, net->port); 1349 *abort_no_unlock = 1; 1350 return (-1); 1351 } 1352 if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) { 1353 /* protocol error... send an abort */ 1354 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1355 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1356 src, dst, sh, op_err, 1357 mflowtype, mflowid, 1358 vrf_id, net->port); 1359 *abort_no_unlock = 1; 1360 return (-1); 1361 } 1362 if (init_ack->num_inbound_streams == 0) { 1363 /* protocol error... send an abort */ 1364 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1365 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1366 src, dst, sh, op_err, 1367 mflowtype, mflowid, 1368 vrf_id, net->port); 1369 *abort_no_unlock = 1; 1370 return (-1); 1371 } 1372 if (init_ack->num_outbound_streams == 0) { 1373 /* protocol error... send an abort */ 1374 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1375 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1376 src, dst, sh, op_err, 1377 mflowtype, mflowid, 1378 vrf_id, net->port); 1379 *abort_no_unlock = 1; 1380 return (-1); 1381 } 1382 /* process according to association state... */ 1383 switch (stcb->asoc.state & SCTP_STATE_MASK) { 1384 case SCTP_STATE_COOKIE_WAIT: 1385 /* this is the expected state for this chunk */ 1386 /* process the INIT-ACK parameters */ 1387 if (stcb->asoc.primary_destination->dest_state & 1388 SCTP_ADDR_UNCONFIRMED) { 1389 /* 1390 * The primary is where we sent the INIT, we can 1391 * always consider it confirmed when the INIT-ACK is 1392 * returned. Do this before we load addresses 1393 * though. 1394 */ 1395 stcb->asoc.primary_destination->dest_state &= 1396 ~SCTP_ADDR_UNCONFIRMED; 1397 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 1398 stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED); 1399 } 1400 if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb, 1401 net, abort_no_unlock, 1402 mflowtype, mflowid, 1403 vrf_id) < 0) { 1404 /* error in parsing parameters */ 1405 return (-1); 1406 } 1407 /* update our state */ 1408 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n"); 1409 SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_ECHOED); 1410 1411 /* reset the RTO calc */ 1412 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 1413 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 1414 stcb->asoc.overall_error_count, 1415 0, 1416 SCTP_FROM_SCTP_INPUT, 1417 __LINE__); 1418 } 1419 stcb->asoc.overall_error_count = 0; 1420 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 1421 /* 1422 * collapse the init timer back in case of a exponential 1423 * backoff 1424 */ 1425 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep, 1426 stcb, net); 1427 /* 1428 * the send at the end of the inbound data processing will 1429 * cause the cookie to be sent 1430 */ 1431 break; 1432 case SCTP_STATE_SHUTDOWN_SENT: 1433 /* incorrect state... discard */ 1434 break; 1435 case SCTP_STATE_COOKIE_ECHOED: 1436 /* incorrect state... discard */ 1437 break; 1438 case SCTP_STATE_OPEN: 1439 /* incorrect state... discard */ 1440 break; 1441 case SCTP_STATE_EMPTY: 1442 case SCTP_STATE_INUSE: 1443 default: 1444 /* incorrect state... discard */ 1445 return (-1); 1446 break; 1447 } 1448 SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n"); 1449 return (0); 1450} 1451 1452static struct sctp_tcb * 1453sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1454 struct sockaddr *src, struct sockaddr *dst, 1455 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1456 struct sctp_inpcb *inp, struct sctp_nets **netp, 1457 struct sockaddr *init_src, int *notification, 1458 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1459 uint8_t mflowtype, uint32_t mflowid, 1460 uint32_t vrf_id, uint16_t port); 1461 1462 1463/* 1464 * handle a state cookie for an existing association m: input packet mbuf 1465 * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a 1466 * "split" mbuf and the cookie signature does not exist offset: offset into 1467 * mbuf to the cookie-echo chunk 1468 */ 1469static struct sctp_tcb * 1470sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset, 1471 struct sockaddr *src, struct sockaddr *dst, 1472 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1473 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp, 1474 struct sockaddr *init_src, int *notification, 1475 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1476 uint8_t mflowtype, uint32_t mflowid, 1477 uint32_t vrf_id, uint16_t port) 1478{ 1479 struct sctp_association *asoc; 1480 struct sctp_init_chunk *init_cp, init_buf; 1481 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1482 struct sctp_nets *net; 1483 struct mbuf *op_err; 1484 int init_offset, initack_offset, i; 1485 int retval; 1486 int spec_flag = 0; 1487 uint32_t how_indx; 1488 1489#if defined(SCTP_DETAILED_STR_STATS) 1490 int j; 1491 1492#endif 1493 1494 net = *netp; 1495 /* I know that the TCB is non-NULL from the caller */ 1496 asoc = &stcb->asoc; 1497 for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) { 1498 if (asoc->cookie_how[how_indx] == 0) 1499 break; 1500 } 1501 if (how_indx < sizeof(asoc->cookie_how)) { 1502 asoc->cookie_how[how_indx] = 1; 1503 } 1504 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 1505 /* SHUTDOWN came in after sending INIT-ACK */ 1506 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination); 1507 op_err = sctp_generate_cause(SCTP_CAUSE_COOKIE_IN_SHUTDOWN, ""); 1508 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 1509 mflowtype, mflowid, inp->fibnum, 1510 vrf_id, net->port); 1511 if (how_indx < sizeof(asoc->cookie_how)) 1512 asoc->cookie_how[how_indx] = 2; 1513 return (NULL); 1514 } 1515 /* 1516 * find and validate the INIT chunk in the cookie (peer's info) the 1517 * INIT should start after the cookie-echo header struct (chunk 1518 * header, state cookie header struct) 1519 */ 1520 init_offset = offset += sizeof(struct sctp_cookie_echo_chunk); 1521 1522 init_cp = (struct sctp_init_chunk *) 1523 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 1524 (uint8_t *) & init_buf); 1525 if (init_cp == NULL) { 1526 /* could not pull a INIT chunk in cookie */ 1527 return (NULL); 1528 } 1529 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 1530 return (NULL); 1531 } 1532 /* 1533 * find and validate the INIT-ACK chunk in the cookie (my info) the 1534 * INIT-ACK follows the INIT chunk 1535 */ 1536 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 1537 initack_cp = (struct sctp_init_ack_chunk *) 1538 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 1539 (uint8_t *) & initack_buf); 1540 if (initack_cp == NULL) { 1541 /* could not pull INIT-ACK chunk in cookie */ 1542 return (NULL); 1543 } 1544 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 1545 return (NULL); 1546 } 1547 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1548 (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) { 1549 /* 1550 * case D in Section 5.2.4 Table 2: MMAA process accordingly 1551 * to get into the OPEN state 1552 */ 1553 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1554 /*- 1555 * Opps, this means that we somehow generated two vtag's 1556 * the same. I.e. we did: 1557 * Us Peer 1558 * <---INIT(tag=a)------ 1559 * ----INIT-ACK(tag=t)--> 1560 * ----INIT(tag=t)------> *1 1561 * <---INIT-ACK(tag=a)--- 1562 * <----CE(tag=t)------------- *2 1563 * 1564 * At point *1 we should be generating a different 1565 * tag t'. Which means we would throw away the CE and send 1566 * ours instead. Basically this is case C (throw away side). 1567 */ 1568 if (how_indx < sizeof(asoc->cookie_how)) 1569 asoc->cookie_how[how_indx] = 17; 1570 return (NULL); 1571 1572 } 1573 switch (SCTP_GET_STATE(asoc)) { 1574 case SCTP_STATE_COOKIE_WAIT: 1575 case SCTP_STATE_COOKIE_ECHOED: 1576 /* 1577 * INIT was sent but got a COOKIE_ECHO with the 1578 * correct tags... just accept it...but we must 1579 * process the init so that we can make sure we have 1580 * the right seq no's. 1581 */ 1582 /* First we must process the INIT !! */ 1583 retval = sctp_process_init(init_cp, stcb); 1584 if (retval < 0) { 1585 if (how_indx < sizeof(asoc->cookie_how)) 1586 asoc->cookie_how[how_indx] = 3; 1587 return (NULL); 1588 } 1589 /* we have already processed the INIT so no problem */ 1590 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, 1591 stcb, net, 1592 SCTP_FROM_SCTP_INPUT + SCTP_LOC_13); 1593 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, 1594 stcb, net, 1595 SCTP_FROM_SCTP_INPUT + SCTP_LOC_14); 1596 /* update current state */ 1597 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) 1598 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1599 else 1600 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1601 1602 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1603 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1604 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1605 stcb->sctp_ep, stcb, asoc->primary_destination); 1606 } 1607 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1608 sctp_stop_all_cookie_timers(stcb); 1609 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1610 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1611 (inp->sctp_socket->so_qlimit == 0) 1612 ) { 1613#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1614 struct socket *so; 1615 1616#endif 1617 /* 1618 * Here is where collision would go if we 1619 * did a connect() and instead got a 1620 * init/init-ack/cookie done before the 1621 * init-ack came back.. 1622 */ 1623 stcb->sctp_ep->sctp_flags |= 1624 SCTP_PCB_FLAGS_CONNECTED; 1625#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1626 so = SCTP_INP_SO(stcb->sctp_ep); 1627 atomic_add_int(&stcb->asoc.refcnt, 1); 1628 SCTP_TCB_UNLOCK(stcb); 1629 SCTP_SOCKET_LOCK(so, 1); 1630 SCTP_TCB_LOCK(stcb); 1631 atomic_add_int(&stcb->asoc.refcnt, -1); 1632 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1633 SCTP_SOCKET_UNLOCK(so, 1); 1634 return (NULL); 1635 } 1636#endif 1637 soisconnected(stcb->sctp_socket); 1638#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1639 SCTP_SOCKET_UNLOCK(so, 1); 1640#endif 1641 } 1642 /* notify upper layer */ 1643 *notification = SCTP_NOTIFY_ASSOC_UP; 1644 /* 1645 * since we did not send a HB make sure we don't 1646 * double things 1647 */ 1648 net->hb_responded = 1; 1649 net->RTO = sctp_calculate_rto(stcb, asoc, net, 1650 &cookie->time_entered, 1651 sctp_align_unsafe_makecopy, 1652 SCTP_RTT_FROM_NON_DATA); 1653 1654 if (stcb->asoc.sctp_autoclose_ticks && 1655 (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) { 1656 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 1657 inp, stcb, NULL); 1658 } 1659 break; 1660 default: 1661 /* 1662 * we're in the OPEN state (or beyond), so peer must 1663 * have simply lost the COOKIE-ACK 1664 */ 1665 break; 1666 } /* end switch */ 1667 sctp_stop_all_cookie_timers(stcb); 1668 /* 1669 * We ignore the return code here.. not sure if we should 1670 * somehow abort.. but we do have an existing asoc. This 1671 * really should not fail. 1672 */ 1673 if (sctp_load_addresses_from_init(stcb, m, 1674 init_offset + sizeof(struct sctp_init_chunk), 1675 initack_offset, src, dst, init_src)) { 1676 if (how_indx < sizeof(asoc->cookie_how)) 1677 asoc->cookie_how[how_indx] = 4; 1678 return (NULL); 1679 } 1680 /* respond with a COOKIE-ACK */ 1681 sctp_toss_old_cookies(stcb, asoc); 1682 sctp_send_cookie_ack(stcb); 1683 if (how_indx < sizeof(asoc->cookie_how)) 1684 asoc->cookie_how[how_indx] = 5; 1685 return (stcb); 1686 } 1687 if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1688 ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag && 1689 cookie->tie_tag_my_vtag == 0 && 1690 cookie->tie_tag_peer_vtag == 0) { 1691 /* 1692 * case C in Section 5.2.4 Table 2: XMOO silently discard 1693 */ 1694 if (how_indx < sizeof(asoc->cookie_how)) 1695 asoc->cookie_how[how_indx] = 6; 1696 return (NULL); 1697 } 1698 /* 1699 * If nat support, and the below and stcb is established, send back 1700 * a ABORT(colliding state) if we are established. 1701 */ 1702 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) && 1703 (asoc->peer_supports_nat) && 1704 ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1705 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1706 (asoc->peer_vtag == 0)))) { 1707 /* 1708 * Special case - Peer's support nat. We may have two init's 1709 * that we gave out the same tag on since one was not 1710 * established.. i.e. we get INIT from host-1 behind the nat 1711 * and we respond tag-a, we get a INIT from host-2 behind 1712 * the nat and we get tag-a again. Then we bring up host-1 1713 * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1). 1714 * Now we have colliding state. We must send an abort here 1715 * with colliding state indication. 1716 */ 1717 op_err = sctp_generate_cause(SCTP_CAUSE_NAT_COLLIDING_STATE, ""); 1718 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err, 1719 mflowtype, mflowid, inp->fibnum, 1720 vrf_id, port); 1721 return (NULL); 1722 } 1723 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1724 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1725 (asoc->peer_vtag == 0))) { 1726 /* 1727 * case B in Section 5.2.4 Table 2: MXAA or MOAA my info 1728 * should be ok, re-accept peer info 1729 */ 1730 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1731 /* 1732 * Extension of case C. If we hit this, then the 1733 * random number generator returned the same vtag 1734 * when we first sent our INIT-ACK and when we later 1735 * sent our INIT. The side with the seq numbers that 1736 * are different will be the one that normnally 1737 * would have hit case C. This in effect "extends" 1738 * our vtags in this collision case to be 64 bits. 1739 * The same collision could occur aka you get both 1740 * vtag and seq number the same twice in a row.. but 1741 * is much less likely. If it did happen then we 1742 * would proceed through and bring up the assoc.. we 1743 * may end up with the wrong stream setup however.. 1744 * which would be bad.. but there is no way to 1745 * tell.. until we send on a stream that does not 1746 * exist :-) 1747 */ 1748 if (how_indx < sizeof(asoc->cookie_how)) 1749 asoc->cookie_how[how_indx] = 7; 1750 1751 return (NULL); 1752 } 1753 if (how_indx < sizeof(asoc->cookie_how)) 1754 asoc->cookie_how[how_indx] = 8; 1755 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, 1756 SCTP_FROM_SCTP_INPUT + SCTP_LOC_15); 1757 sctp_stop_all_cookie_timers(stcb); 1758 /* 1759 * since we did not send a HB make sure we don't double 1760 * things 1761 */ 1762 net->hb_responded = 1; 1763 if (stcb->asoc.sctp_autoclose_ticks && 1764 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 1765 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, 1766 NULL); 1767 } 1768 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1769 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 1770 1771 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) { 1772 /* 1773 * Ok the peer probably discarded our data (if we 1774 * echoed a cookie+data). So anything on the 1775 * sent_queue should be marked for retransmit, we 1776 * may not get something to kick us so it COULD 1777 * still take a timeout to move these.. but it can't 1778 * hurt to mark them. 1779 */ 1780 struct sctp_tmit_chunk *chk; 1781 1782 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 1783 if (chk->sent < SCTP_DATAGRAM_RESEND) { 1784 chk->sent = SCTP_DATAGRAM_RESEND; 1785 sctp_flight_size_decrease(chk); 1786 sctp_total_flight_decrease(stcb, chk); 1787 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 1788 spec_flag++; 1789 } 1790 } 1791 1792 } 1793 /* process the INIT info (peer's info) */ 1794 retval = sctp_process_init(init_cp, stcb); 1795 if (retval < 0) { 1796 if (how_indx < sizeof(asoc->cookie_how)) 1797 asoc->cookie_how[how_indx] = 9; 1798 return (NULL); 1799 } 1800 if (sctp_load_addresses_from_init(stcb, m, 1801 init_offset + sizeof(struct sctp_init_chunk), 1802 initack_offset, src, dst, init_src)) { 1803 if (how_indx < sizeof(asoc->cookie_how)) 1804 asoc->cookie_how[how_indx] = 10; 1805 return (NULL); 1806 } 1807 if ((asoc->state & SCTP_STATE_COOKIE_WAIT) || 1808 (asoc->state & SCTP_STATE_COOKIE_ECHOED)) { 1809 *notification = SCTP_NOTIFY_ASSOC_UP; 1810 1811 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1812 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1813 (inp->sctp_socket->so_qlimit == 0)) { 1814#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1815 struct socket *so; 1816 1817#endif 1818 stcb->sctp_ep->sctp_flags |= 1819 SCTP_PCB_FLAGS_CONNECTED; 1820#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1821 so = SCTP_INP_SO(stcb->sctp_ep); 1822 atomic_add_int(&stcb->asoc.refcnt, 1); 1823 SCTP_TCB_UNLOCK(stcb); 1824 SCTP_SOCKET_LOCK(so, 1); 1825 SCTP_TCB_LOCK(stcb); 1826 atomic_add_int(&stcb->asoc.refcnt, -1); 1827 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1828 SCTP_SOCKET_UNLOCK(so, 1); 1829 return (NULL); 1830 } 1831#endif 1832 soisconnected(stcb->sctp_socket); 1833#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1834 SCTP_SOCKET_UNLOCK(so, 1); 1835#endif 1836 } 1837 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) 1838 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1839 else 1840 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1841 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1842 } else if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) { 1843 SCTP_STAT_INCR_COUNTER32(sctps_restartestab); 1844 } else { 1845 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1846 } 1847 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1848 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1849 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1850 stcb->sctp_ep, stcb, asoc->primary_destination); 1851 } 1852 sctp_stop_all_cookie_timers(stcb); 1853 sctp_toss_old_cookies(stcb, asoc); 1854 sctp_send_cookie_ack(stcb); 1855 if (spec_flag) { 1856 /* 1857 * only if we have retrans set do we do this. What 1858 * this call does is get only the COOKIE-ACK out and 1859 * then when we return the normal call to 1860 * sctp_chunk_output will get the retrans out behind 1861 * this. 1862 */ 1863 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED); 1864 } 1865 if (how_indx < sizeof(asoc->cookie_how)) 1866 asoc->cookie_how[how_indx] = 11; 1867 1868 return (stcb); 1869 } 1870 if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1871 ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) && 1872 cookie->tie_tag_my_vtag == asoc->my_vtag_nonce && 1873 cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce && 1874 cookie->tie_tag_peer_vtag != 0) { 1875 struct sctpasochead *head; 1876 1877#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1878 struct socket *so; 1879 1880#endif 1881 1882 if (asoc->peer_supports_nat) { 1883 /* 1884 * This is a gross gross hack. Just call the 1885 * cookie_new code since we are allowing a duplicate 1886 * association. I hope this works... 1887 */ 1888 return (sctp_process_cookie_new(m, iphlen, offset, src, dst, 1889 sh, cookie, cookie_len, 1890 inp, netp, init_src, notification, 1891 auth_skipped, auth_offset, auth_len, 1892 mflowtype, mflowid, 1893 vrf_id, port)); 1894 } 1895 /* 1896 * case A in Section 5.2.4 Table 2: XXMM (peer restarted) 1897 */ 1898 /* temp code */ 1899 if (how_indx < sizeof(asoc->cookie_how)) 1900 asoc->cookie_how[how_indx] = 12; 1901 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, 1902 SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 1903 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, 1904 SCTP_FROM_SCTP_INPUT + SCTP_LOC_17); 1905 1906 /* notify upper layer */ 1907 *notification = SCTP_NOTIFY_ASSOC_RESTART; 1908 atomic_add_int(&stcb->asoc.refcnt, 1); 1909 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_OPEN) && 1910 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) && 1911 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) { 1912 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1913 } 1914 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) { 1915 SCTP_STAT_INCR_GAUGE32(sctps_restartestab); 1916 } else if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) { 1917 SCTP_STAT_INCR_GAUGE32(sctps_collisionestab); 1918 } 1919 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1920 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1921 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1922 stcb->sctp_ep, stcb, asoc->primary_destination); 1923 1924 } else if (!(asoc->state & SCTP_STATE_SHUTDOWN_SENT)) { 1925 /* move to OPEN state, if not in SHUTDOWN_SENT */ 1926 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1927 } 1928 asoc->pre_open_streams = 1929 ntohs(initack_cp->init.num_outbound_streams); 1930 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 1931 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 1932 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 1933 1934 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 1935 1936 asoc->str_reset_seq_in = asoc->init_seq_number; 1937 1938 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 1939 if (asoc->mapping_array) { 1940 memset(asoc->mapping_array, 0, 1941 asoc->mapping_array_size); 1942 } 1943 if (asoc->nr_mapping_array) { 1944 memset(asoc->nr_mapping_array, 0, 1945 asoc->mapping_array_size); 1946 } 1947 SCTP_TCB_UNLOCK(stcb); 1948#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1949 so = SCTP_INP_SO(stcb->sctp_ep); 1950 SCTP_SOCKET_LOCK(so, 1); 1951#endif 1952 SCTP_INP_INFO_WLOCK(); 1953 SCTP_INP_WLOCK(stcb->sctp_ep); 1954 SCTP_TCB_LOCK(stcb); 1955 atomic_add_int(&stcb->asoc.refcnt, -1); 1956 /* send up all the data */ 1957 SCTP_TCB_SEND_LOCK(stcb); 1958 1959 sctp_report_all_outbound(stcb, 0, 1, SCTP_SO_LOCKED); 1960 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 1961 stcb->asoc.strmout[i].chunks_on_queues = 0; 1962#if defined(SCTP_DETAILED_STR_STATS) 1963 for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) { 1964 asoc->strmout[i].abandoned_sent[j] = 0; 1965 asoc->strmout[i].abandoned_unsent[j] = 0; 1966 } 1967#else 1968 asoc->strmout[i].abandoned_sent[0] = 0; 1969 asoc->strmout[i].abandoned_unsent[0] = 0; 1970#endif 1971 stcb->asoc.strmout[i].stream_no = i; 1972 stcb->asoc.strmout[i].next_sequence_send = 0; 1973 stcb->asoc.strmout[i].last_msg_incomplete = 0; 1974 } 1975 /* process the INIT-ACK info (my info) */ 1976 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 1977 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1978 1979 /* pull from vtag hash */ 1980 LIST_REMOVE(stcb, sctp_asocs); 1981 /* re-insert to new vtag position */ 1982 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, 1983 SCTP_BASE_INFO(hashasocmark))]; 1984 /* 1985 * put it in the bucket in the vtag hash of assoc's for the 1986 * system 1987 */ 1988 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 1989 1990 SCTP_TCB_SEND_UNLOCK(stcb); 1991 SCTP_INP_WUNLOCK(stcb->sctp_ep); 1992 SCTP_INP_INFO_WUNLOCK(); 1993#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1994 SCTP_SOCKET_UNLOCK(so, 1); 1995#endif 1996 asoc->total_flight = 0; 1997 asoc->total_flight_count = 0; 1998 /* process the INIT info (peer's info) */ 1999 retval = sctp_process_init(init_cp, stcb); 2000 if (retval < 0) { 2001 if (how_indx < sizeof(asoc->cookie_how)) 2002 asoc->cookie_how[how_indx] = 13; 2003 2004 return (NULL); 2005 } 2006 /* 2007 * since we did not send a HB make sure we don't double 2008 * things 2009 */ 2010 net->hb_responded = 1; 2011 2012 if (sctp_load_addresses_from_init(stcb, m, 2013 init_offset + sizeof(struct sctp_init_chunk), 2014 initack_offset, src, dst, init_src)) { 2015 if (how_indx < sizeof(asoc->cookie_how)) 2016 asoc->cookie_how[how_indx] = 14; 2017 2018 return (NULL); 2019 } 2020 /* respond with a COOKIE-ACK */ 2021 sctp_stop_all_cookie_timers(stcb); 2022 sctp_toss_old_cookies(stcb, asoc); 2023 sctp_send_cookie_ack(stcb); 2024 if (how_indx < sizeof(asoc->cookie_how)) 2025 asoc->cookie_how[how_indx] = 15; 2026 2027 return (stcb); 2028 } 2029 if (how_indx < sizeof(asoc->cookie_how)) 2030 asoc->cookie_how[how_indx] = 16; 2031 /* all other cases... */ 2032 return (NULL); 2033} 2034 2035 2036/* 2037 * handle a state cookie for a new association m: input packet mbuf chain-- 2038 * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf 2039 * and the cookie signature does not exist offset: offset into mbuf to the 2040 * cookie-echo chunk length: length of the cookie chunk to: where the init 2041 * was from returns a new TCB 2042 */ 2043static struct sctp_tcb * 2044sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 2045 struct sockaddr *src, struct sockaddr *dst, 2046 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 2047 struct sctp_inpcb *inp, struct sctp_nets **netp, 2048 struct sockaddr *init_src, int *notification, 2049 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2050 uint8_t mflowtype, uint32_t mflowid, 2051 uint32_t vrf_id, uint16_t port) 2052{ 2053 struct sctp_tcb *stcb; 2054 struct sctp_init_chunk *init_cp, init_buf; 2055 struct sctp_init_ack_chunk *initack_cp, initack_buf; 2056 union sctp_sockstore store; 2057 struct sctp_association *asoc; 2058 int init_offset, initack_offset, initack_limit; 2059 int retval; 2060 int error = 0; 2061 uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE]; 2062 2063#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2064 struct socket *so; 2065 2066 so = SCTP_INP_SO(inp); 2067#endif 2068 2069 /* 2070 * find and validate the INIT chunk in the cookie (peer's info) the 2071 * INIT should start after the cookie-echo header struct (chunk 2072 * header, state cookie header struct) 2073 */ 2074 init_offset = offset + sizeof(struct sctp_cookie_echo_chunk); 2075 init_cp = (struct sctp_init_chunk *) 2076 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 2077 (uint8_t *) & init_buf); 2078 if (init_cp == NULL) { 2079 /* could not pull a INIT chunk in cookie */ 2080 SCTPDBG(SCTP_DEBUG_INPUT1, 2081 "process_cookie_new: could not pull INIT chunk hdr\n"); 2082 return (NULL); 2083 } 2084 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 2085 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n"); 2086 return (NULL); 2087 } 2088 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 2089 /* 2090 * find and validate the INIT-ACK chunk in the cookie (my info) the 2091 * INIT-ACK follows the INIT chunk 2092 */ 2093 initack_cp = (struct sctp_init_ack_chunk *) 2094 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 2095 (uint8_t *) & initack_buf); 2096 if (initack_cp == NULL) { 2097 /* could not pull INIT-ACK chunk in cookie */ 2098 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n"); 2099 return (NULL); 2100 } 2101 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 2102 return (NULL); 2103 } 2104 /* 2105 * NOTE: We can't use the INIT_ACK's chk_length to determine the 2106 * "initack_limit" value. This is because the chk_length field 2107 * includes the length of the cookie, but the cookie is omitted when 2108 * the INIT and INIT_ACK are tacked onto the cookie... 2109 */ 2110 initack_limit = offset + cookie_len; 2111 2112 /* 2113 * now that we know the INIT/INIT-ACK are in place, create a new TCB 2114 * and popluate 2115 */ 2116 2117 /* 2118 * Here we do a trick, we set in NULL for the proc/thread argument. 2119 * We do this since in effect we only use the p argument when the 2120 * socket is unbound and we must do an implicit bind. Since we are 2121 * getting a cookie, we cannot be unbound. 2122 */ 2123 stcb = sctp_aloc_assoc(inp, init_src, &error, 2124 ntohl(initack_cp->init.initiate_tag), vrf_id, 2125 ntohs(initack_cp->init.num_outbound_streams), 2126 (struct thread *)NULL 2127 ); 2128 if (stcb == NULL) { 2129 struct mbuf *op_err; 2130 2131 /* memory problem? */ 2132 SCTPDBG(SCTP_DEBUG_INPUT1, 2133 "process_cookie_new: no room for another TCB!\n"); 2134 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2135 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2136 src, dst, sh, op_err, 2137 mflowtype, mflowid, 2138 vrf_id, port); 2139 return (NULL); 2140 } 2141 /* get the correct sctp_nets */ 2142 if (netp) 2143 *netp = sctp_findnet(stcb, init_src); 2144 2145 asoc = &stcb->asoc; 2146 /* get scope variables out of cookie */ 2147 asoc->scope.ipv4_local_scope = cookie->ipv4_scope; 2148 asoc->scope.site_scope = cookie->site_scope; 2149 asoc->scope.local_scope = cookie->local_scope; 2150 asoc->scope.loopback_scope = cookie->loopback_scope; 2151 2152 if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) || 2153 (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) { 2154 struct mbuf *op_err; 2155 2156 /* 2157 * Houston we have a problem. The EP changed while the 2158 * cookie was in flight. Only recourse is to abort the 2159 * association. 2160 */ 2161 atomic_add_int(&stcb->asoc.refcnt, 1); 2162 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2163 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2164 src, dst, sh, op_err, 2165 mflowtype, mflowid, 2166 vrf_id, port); 2167#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2168 SCTP_TCB_UNLOCK(stcb); 2169 SCTP_SOCKET_LOCK(so, 1); 2170 SCTP_TCB_LOCK(stcb); 2171#endif 2172 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2173 SCTP_FROM_SCTP_INPUT + SCTP_LOC_18); 2174#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2175 SCTP_SOCKET_UNLOCK(so, 1); 2176#endif 2177 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2178 return (NULL); 2179 } 2180 /* process the INIT-ACK info (my info) */ 2181 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 2182 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 2183 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 2184 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 2185 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 2186 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 2187 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 2188 asoc->str_reset_seq_in = asoc->init_seq_number; 2189 2190 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 2191 2192 /* process the INIT info (peer's info) */ 2193 if (netp) 2194 retval = sctp_process_init(init_cp, stcb); 2195 else 2196 retval = 0; 2197 if (retval < 0) { 2198 atomic_add_int(&stcb->asoc.refcnt, 1); 2199#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2200 SCTP_TCB_UNLOCK(stcb); 2201 SCTP_SOCKET_LOCK(so, 1); 2202 SCTP_TCB_LOCK(stcb); 2203#endif 2204 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2205 SCTP_FROM_SCTP_INPUT + SCTP_LOC_19); 2206#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2207 SCTP_SOCKET_UNLOCK(so, 1); 2208#endif 2209 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2210 return (NULL); 2211 } 2212 /* load all addresses */ 2213 if (sctp_load_addresses_from_init(stcb, m, 2214 init_offset + sizeof(struct sctp_init_chunk), initack_offset, 2215 src, dst, init_src)) { 2216 atomic_add_int(&stcb->asoc.refcnt, 1); 2217#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2218 SCTP_TCB_UNLOCK(stcb); 2219 SCTP_SOCKET_LOCK(so, 1); 2220 SCTP_TCB_LOCK(stcb); 2221#endif 2222 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2223 SCTP_FROM_SCTP_INPUT + SCTP_LOC_20); 2224#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2225 SCTP_SOCKET_UNLOCK(so, 1); 2226#endif 2227 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2228 return (NULL); 2229 } 2230 /* 2231 * verify any preceding AUTH chunk that was skipped 2232 */ 2233 /* pull the local authentication parameters from the cookie/init-ack */ 2234 sctp_auth_get_cookie_params(stcb, m, 2235 initack_offset + sizeof(struct sctp_init_ack_chunk), 2236 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk))); 2237 if (auth_skipped) { 2238 struct sctp_auth_chunk *auth; 2239 2240 auth = (struct sctp_auth_chunk *) 2241 sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf); 2242 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) { 2243 /* auth HMAC failed, dump the assoc and packet */ 2244 SCTPDBG(SCTP_DEBUG_AUTH1, 2245 "COOKIE-ECHO: AUTH failed\n"); 2246 atomic_add_int(&stcb->asoc.refcnt, 1); 2247#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2248 SCTP_TCB_UNLOCK(stcb); 2249 SCTP_SOCKET_LOCK(so, 1); 2250 SCTP_TCB_LOCK(stcb); 2251#endif 2252 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2253 SCTP_FROM_SCTP_INPUT + SCTP_LOC_21); 2254#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2255 SCTP_SOCKET_UNLOCK(so, 1); 2256#endif 2257 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2258 return (NULL); 2259 } else { 2260 /* remaining chunks checked... good to go */ 2261 stcb->asoc.authenticated = 1; 2262 } 2263 } 2264 /* update current state */ 2265 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2266 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 2267 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2268 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2269 stcb->sctp_ep, stcb, asoc->primary_destination); 2270 } 2271 sctp_stop_all_cookie_timers(stcb); 2272 SCTP_STAT_INCR_COUNTER32(sctps_passiveestab); 2273 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2274 2275 /* 2276 * if we're doing ASCONFs, check to see if we have any new local 2277 * addresses that need to get added to the peer (eg. addresses 2278 * changed while cookie echo in flight). This needs to be done 2279 * after we go to the OPEN state to do the correct asconf 2280 * processing. else, make sure we have the correct addresses in our 2281 * lists 2282 */ 2283 2284 /* warning, we re-use sin, sin6, sa_store here! */ 2285 /* pull in local_address (our "from" address) */ 2286 switch (cookie->laddr_type) { 2287#ifdef INET 2288 case SCTP_IPV4_ADDRESS: 2289 /* source addr is IPv4 */ 2290 memset(&store.sin, 0, sizeof(struct sockaddr_in)); 2291 store.sin.sin_family = AF_INET; 2292 store.sin.sin_len = sizeof(struct sockaddr_in); 2293 store.sin.sin_addr.s_addr = cookie->laddress[0]; 2294 break; 2295#endif 2296#ifdef INET6 2297 case SCTP_IPV6_ADDRESS: 2298 /* source addr is IPv6 */ 2299 memset(&store.sin6, 0, sizeof(struct sockaddr_in6)); 2300 store.sin6.sin6_family = AF_INET6; 2301 store.sin6.sin6_len = sizeof(struct sockaddr_in6); 2302 store.sin6.sin6_scope_id = cookie->scope_id; 2303 memcpy(&store.sin6.sin6_addr, cookie->laddress, sizeof(struct in6_addr)); 2304 break; 2305#endif 2306 default: 2307 atomic_add_int(&stcb->asoc.refcnt, 1); 2308#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2309 SCTP_TCB_UNLOCK(stcb); 2310 SCTP_SOCKET_LOCK(so, 1); 2311 SCTP_TCB_LOCK(stcb); 2312#endif 2313 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2314 SCTP_FROM_SCTP_INPUT + SCTP_LOC_22); 2315#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2316 SCTP_SOCKET_UNLOCK(so, 1); 2317#endif 2318 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2319 return (NULL); 2320 } 2321 2322 /* set up to notify upper layer */ 2323 *notification = SCTP_NOTIFY_ASSOC_UP; 2324 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2325 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 2326 (inp->sctp_socket->so_qlimit == 0)) { 2327 /* 2328 * This is an endpoint that called connect() how it got a 2329 * cookie that is NEW is a bit of a mystery. It must be that 2330 * the INIT was sent, but before it got there.. a complete 2331 * INIT/INIT-ACK/COOKIE arrived. But of course then it 2332 * should have went to the other code.. not here.. oh well.. 2333 * a bit of protection is worth having.. 2334 */ 2335 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2336#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2337 atomic_add_int(&stcb->asoc.refcnt, 1); 2338 SCTP_TCB_UNLOCK(stcb); 2339 SCTP_SOCKET_LOCK(so, 1); 2340 SCTP_TCB_LOCK(stcb); 2341 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2342 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2343 SCTP_SOCKET_UNLOCK(so, 1); 2344 return (NULL); 2345 } 2346#endif 2347 soisconnected(stcb->sctp_socket); 2348#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2349 SCTP_SOCKET_UNLOCK(so, 1); 2350#endif 2351 } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 2352 (inp->sctp_socket->so_qlimit)) { 2353 /* 2354 * We don't want to do anything with this one. Since it is 2355 * the listening guy. The timer will get started for 2356 * accepted connections in the caller. 2357 */ 2358 ; 2359 } 2360 /* since we did not send a HB make sure we don't double things */ 2361 if ((netp) && (*netp)) 2362 (*netp)->hb_responded = 1; 2363 2364 if (stcb->asoc.sctp_autoclose_ticks && 2365 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2366 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL); 2367 } 2368 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 2369 if ((netp != NULL) && (*netp != NULL)) { 2370 /* calculate the RTT and set the encaps port */ 2371 (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp, 2372 &cookie->time_entered, sctp_align_unsafe_makecopy, 2373 SCTP_RTT_FROM_NON_DATA); 2374#if defined(INET) || defined(INET6) 2375 if (((*netp)->port == 0) && (port != 0)) { 2376 sctp_pathmtu_adjustment(stcb, (uint16_t) ((*netp)->mtu - sizeof(struct udphdr))); 2377 } 2378 (*netp)->port = port; 2379#endif 2380 } 2381 /* respond with a COOKIE-ACK */ 2382 sctp_send_cookie_ack(stcb); 2383 2384 /* 2385 * check the address lists for any ASCONFs that need to be sent 2386 * AFTER the cookie-ack is sent 2387 */ 2388 sctp_check_address_list(stcb, m, 2389 initack_offset + sizeof(struct sctp_init_ack_chunk), 2390 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)), 2391 &store.sa, cookie->local_scope, cookie->site_scope, 2392 cookie->ipv4_scope, cookie->loopback_scope); 2393 2394 2395 return (stcb); 2396} 2397 2398/* 2399 * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e 2400 * we NEED to make sure we are not already using the vtag. If so we 2401 * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit! 2402 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag, 2403 SCTP_BASE_INFO(hashasocmark))]; 2404 LIST_FOREACH(stcb, head, sctp_asocs) { 2405 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep)) { 2406 -- SEND ABORT - TRY AGAIN -- 2407 } 2408 } 2409*/ 2410 2411/* 2412 * handles a COOKIE-ECHO message stcb: modified to either a new or left as 2413 * existing (non-NULL) TCB 2414 */ 2415static struct mbuf * 2416sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset, 2417 struct sockaddr *src, struct sockaddr *dst, 2418 struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp, 2419 struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp, 2420 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2421 struct sctp_tcb **locked_tcb, 2422 uint8_t mflowtype, uint32_t mflowid, 2423 uint32_t vrf_id, uint16_t port) 2424{ 2425 struct sctp_state_cookie *cookie; 2426 struct sctp_tcb *l_stcb = *stcb; 2427 struct sctp_inpcb *l_inp; 2428 struct sockaddr *to; 2429 struct sctp_pcb *ep; 2430 struct mbuf *m_sig; 2431 uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE]; 2432 uint8_t *sig; 2433 uint8_t cookie_ok = 0; 2434 unsigned int sig_offset, cookie_offset; 2435 unsigned int cookie_len; 2436 struct timeval now; 2437 struct timeval time_expires; 2438 int notification = 0; 2439 struct sctp_nets *netl; 2440 int had_a_existing_tcb = 0; 2441 int send_int_conf = 0; 2442 2443#ifdef INET 2444 struct sockaddr_in sin; 2445 2446#endif 2447#ifdef INET6 2448 struct sockaddr_in6 sin6; 2449 2450#endif 2451 2452 SCTPDBG(SCTP_DEBUG_INPUT2, 2453 "sctp_handle_cookie: handling COOKIE-ECHO\n"); 2454 2455 if (inp_p == NULL) { 2456 return (NULL); 2457 } 2458 cookie = &cp->cookie; 2459 cookie_offset = offset + sizeof(struct sctp_chunkhdr); 2460 cookie_len = ntohs(cp->ch.chunk_length); 2461 2462 if ((cookie->peerport != sh->src_port) || 2463 (cookie->myport != sh->dest_port) || 2464 (cookie->my_vtag != sh->v_tag)) { 2465 /* 2466 * invalid ports or bad tag. Note that we always leave the 2467 * v_tag in the header in network order and when we stored 2468 * it in the my_vtag slot we also left it in network order. 2469 * This maintains the match even though it may be in the 2470 * opposite byte order of the machine :-> 2471 */ 2472 return (NULL); 2473 } 2474 if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) + 2475 sizeof(struct sctp_init_chunk) + 2476 sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) { 2477 /* cookie too small */ 2478 return (NULL); 2479 } 2480 /* 2481 * split off the signature into its own mbuf (since it should not be 2482 * calculated in the sctp_hmac_m() call). 2483 */ 2484 sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE; 2485 m_sig = m_split(m, sig_offset, M_NOWAIT); 2486 if (m_sig == NULL) { 2487 /* out of memory or ?? */ 2488 return (NULL); 2489 } 2490#ifdef SCTP_MBUF_LOGGING 2491 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 2492 sctp_log_mbc(m_sig, SCTP_MBUF_SPLIT); 2493 } 2494#endif 2495 2496 /* 2497 * compute the signature/digest for the cookie 2498 */ 2499 ep = &(*inp_p)->sctp_ep; 2500 l_inp = *inp_p; 2501 if (l_stcb) { 2502 SCTP_TCB_UNLOCK(l_stcb); 2503 } 2504 SCTP_INP_RLOCK(l_inp); 2505 if (l_stcb) { 2506 SCTP_TCB_LOCK(l_stcb); 2507 } 2508 /* which cookie is it? */ 2509 if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) && 2510 (ep->current_secret_number != ep->last_secret_number)) { 2511 /* it's the old cookie */ 2512 (void)sctp_hmac_m(SCTP_HMAC, 2513 (uint8_t *) ep->secret_key[(int)ep->last_secret_number], 2514 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2515 } else { 2516 /* it's the current cookie */ 2517 (void)sctp_hmac_m(SCTP_HMAC, 2518 (uint8_t *) ep->secret_key[(int)ep->current_secret_number], 2519 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2520 } 2521 /* get the signature */ 2522 SCTP_INP_RUNLOCK(l_inp); 2523 sig = (uint8_t *) sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *) & tmp_sig); 2524 if (sig == NULL) { 2525 /* couldn't find signature */ 2526 sctp_m_freem(m_sig); 2527 return (NULL); 2528 } 2529 /* compare the received digest with the computed digest */ 2530 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) { 2531 /* try the old cookie? */ 2532 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) && 2533 (ep->current_secret_number != ep->last_secret_number)) { 2534 /* compute digest with old */ 2535 (void)sctp_hmac_m(SCTP_HMAC, 2536 (uint8_t *) ep->secret_key[(int)ep->last_secret_number], 2537 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2538 /* compare */ 2539 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0) 2540 cookie_ok = 1; 2541 } 2542 } else { 2543 cookie_ok = 1; 2544 } 2545 2546 /* 2547 * Now before we continue we must reconstruct our mbuf so that 2548 * normal processing of any other chunks will work. 2549 */ 2550 { 2551 struct mbuf *m_at; 2552 2553 m_at = m; 2554 while (SCTP_BUF_NEXT(m_at) != NULL) { 2555 m_at = SCTP_BUF_NEXT(m_at); 2556 } 2557 SCTP_BUF_NEXT(m_at) = m_sig; 2558 } 2559 2560 if (cookie_ok == 0) { 2561 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n"); 2562 SCTPDBG(SCTP_DEBUG_INPUT2, 2563 "offset = %u, cookie_offset = %u, sig_offset = %u\n", 2564 (uint32_t) offset, cookie_offset, sig_offset); 2565 return (NULL); 2566 } 2567 /* 2568 * check the cookie timestamps to be sure it's not stale 2569 */ 2570 (void)SCTP_GETTIME_TIMEVAL(&now); 2571 /* Expire time is in Ticks, so we convert to seconds */ 2572 time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life); 2573 time_expires.tv_usec = cookie->time_entered.tv_usec; 2574 /* 2575 * TODO sctp_constants.h needs alternative time macros when _KERNEL 2576 * is undefined. 2577 */ 2578 if (timevalcmp(&now, &time_expires, >)) { 2579 /* cookie is stale! */ 2580 struct mbuf *op_err; 2581 struct sctp_error_stale_cookie *cause; 2582 uint32_t tim; 2583 2584 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_error_stale_cookie), 2585 0, M_NOWAIT, 1, MT_DATA); 2586 if (op_err == NULL) { 2587 /* FOOBAR */ 2588 return (NULL); 2589 } 2590 /* Set the len */ 2591 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_error_stale_cookie); 2592 cause = mtod(op_err, struct sctp_error_stale_cookie *); 2593 cause->cause.code = htons(SCTP_CAUSE_STALE_COOKIE); 2594 cause->cause.length = htons((sizeof(struct sctp_paramhdr) + 2595 (sizeof(uint32_t)))); 2596 /* seconds to usec */ 2597 tim = (now.tv_sec - time_expires.tv_sec) * 1000000; 2598 /* add in usec */ 2599 if (tim == 0) 2600 tim = now.tv_usec - cookie->time_entered.tv_usec; 2601 cause->stale_time = htonl(tim); 2602 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 2603 mflowtype, mflowid, l_inp->fibnum, 2604 vrf_id, port); 2605 return (NULL); 2606 } 2607 /* 2608 * Now we must see with the lookup address if we have an existing 2609 * asoc. This will only happen if we were in the COOKIE-WAIT state 2610 * and a INIT collided with us and somewhere the peer sent the 2611 * cookie on another address besides the single address our assoc 2612 * had for him. In this case we will have one of the tie-tags set at 2613 * least AND the address field in the cookie can be used to look it 2614 * up. 2615 */ 2616 to = NULL; 2617 switch (cookie->addr_type) { 2618#ifdef INET6 2619 case SCTP_IPV6_ADDRESS: 2620 memset(&sin6, 0, sizeof(sin6)); 2621 sin6.sin6_family = AF_INET6; 2622 sin6.sin6_len = sizeof(sin6); 2623 sin6.sin6_port = sh->src_port; 2624 sin6.sin6_scope_id = cookie->scope_id; 2625 memcpy(&sin6.sin6_addr.s6_addr, cookie->address, 2626 sizeof(sin6.sin6_addr.s6_addr)); 2627 to = (struct sockaddr *)&sin6; 2628 break; 2629#endif 2630#ifdef INET 2631 case SCTP_IPV4_ADDRESS: 2632 memset(&sin, 0, sizeof(sin)); 2633 sin.sin_family = AF_INET; 2634 sin.sin_len = sizeof(sin); 2635 sin.sin_port = sh->src_port; 2636 sin.sin_addr.s_addr = cookie->address[0]; 2637 to = (struct sockaddr *)&sin; 2638 break; 2639#endif 2640 default: 2641 /* This should not happen */ 2642 return (NULL); 2643 } 2644 if (*stcb == NULL) { 2645 /* Yep, lets check */ 2646 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL); 2647 if (*stcb == NULL) { 2648 /* 2649 * We should have only got back the same inp. If we 2650 * got back a different ep we have a problem. The 2651 * original findep got back l_inp and now 2652 */ 2653 if (l_inp != *inp_p) { 2654 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n"); 2655 } 2656 } else { 2657 if (*locked_tcb == NULL) { 2658 /* 2659 * In this case we found the assoc only 2660 * after we locked the create lock. This 2661 * means we are in a colliding case and we 2662 * must make sure that we unlock the tcb if 2663 * its one of the cases where we throw away 2664 * the incoming packets. 2665 */ 2666 *locked_tcb = *stcb; 2667 2668 /* 2669 * We must also increment the inp ref count 2670 * since the ref_count flags was set when we 2671 * did not find the TCB, now we found it 2672 * which reduces the refcount.. we must 2673 * raise it back out to balance it all :-) 2674 */ 2675 SCTP_INP_INCR_REF((*stcb)->sctp_ep); 2676 if ((*stcb)->sctp_ep != l_inp) { 2677 SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n", 2678 (void *)(*stcb)->sctp_ep, (void *)l_inp); 2679 } 2680 } 2681 } 2682 } 2683 cookie_len -= SCTP_SIGNATURE_SIZE; 2684 if (*stcb == NULL) { 2685 /* this is the "normal" case... get a new TCB */ 2686 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh, 2687 cookie, cookie_len, *inp_p, 2688 netp, to, ¬ification, 2689 auth_skipped, auth_offset, auth_len, 2690 mflowtype, mflowid, 2691 vrf_id, port); 2692 } else { 2693 /* this is abnormal... cookie-echo on existing TCB */ 2694 had_a_existing_tcb = 1; 2695 *stcb = sctp_process_cookie_existing(m, iphlen, offset, 2696 src, dst, sh, 2697 cookie, cookie_len, *inp_p, *stcb, netp, to, 2698 ¬ification, auth_skipped, auth_offset, auth_len, 2699 mflowtype, mflowid, 2700 vrf_id, port); 2701 } 2702 2703 if (*stcb == NULL) { 2704 /* still no TCB... must be bad cookie-echo */ 2705 return (NULL); 2706 } 2707 if (*netp != NULL) { 2708 (*netp)->flowtype = mflowtype; 2709 (*netp)->flowid = mflowid; 2710 } 2711 /* 2712 * Ok, we built an association so confirm the address we sent the 2713 * INIT-ACK to. 2714 */ 2715 netl = sctp_findnet(*stcb, to); 2716 /* 2717 * This code should in theory NOT run but 2718 */ 2719 if (netl == NULL) { 2720 /* TSNH! Huh, why do I need to add this address here? */ 2721 if (sctp_add_remote_addr(*stcb, to, NULL, SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) { 2722 return (NULL); 2723 } 2724 netl = sctp_findnet(*stcb, to); 2725 } 2726 if (netl) { 2727 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) { 2728 netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 2729 (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL, 2730 netl); 2731 send_int_conf = 1; 2732 } 2733 } 2734 sctp_start_net_timers(*stcb); 2735 if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) { 2736 if (!had_a_existing_tcb || 2737 (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) { 2738 /* 2739 * If we have a NEW cookie or the connect never 2740 * reached the connected state during collision we 2741 * must do the TCP accept thing. 2742 */ 2743 struct socket *so, *oso; 2744 struct sctp_inpcb *inp; 2745 2746 if (notification == SCTP_NOTIFY_ASSOC_RESTART) { 2747 /* 2748 * For a restart we will keep the same 2749 * socket, no need to do anything. I THINK!! 2750 */ 2751 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2752 if (send_int_conf) { 2753 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2754 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2755 } 2756 return (m); 2757 } 2758 oso = (*inp_p)->sctp_socket; 2759 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2760 SCTP_TCB_UNLOCK((*stcb)); 2761 CURVNET_SET(oso->so_vnet); 2762 so = sonewconn(oso, 0 2763 ); 2764 CURVNET_RESTORE(); 2765 SCTP_TCB_LOCK((*stcb)); 2766 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2767 2768 if (so == NULL) { 2769 struct mbuf *op_err; 2770 2771#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2772 struct socket *pcb_so; 2773 2774#endif 2775 /* Too many sockets */ 2776 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n"); 2777 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2778 sctp_abort_association(*inp_p, NULL, m, iphlen, 2779 src, dst, sh, op_err, 2780 mflowtype, mflowid, 2781 vrf_id, port); 2782#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2783 pcb_so = SCTP_INP_SO(*inp_p); 2784 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2785 SCTP_TCB_UNLOCK((*stcb)); 2786 SCTP_SOCKET_LOCK(pcb_so, 1); 2787 SCTP_TCB_LOCK((*stcb)); 2788 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2789#endif 2790 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, 2791 SCTP_FROM_SCTP_INPUT + SCTP_LOC_23); 2792#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2793 SCTP_SOCKET_UNLOCK(pcb_so, 1); 2794#endif 2795 return (NULL); 2796 } 2797 inp = (struct sctp_inpcb *)so->so_pcb; 2798 SCTP_INP_INCR_REF(inp); 2799 /* 2800 * We add the unbound flag here so that if we get an 2801 * soabort() before we get the move_pcb done, we 2802 * will properly cleanup. 2803 */ 2804 inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE | 2805 SCTP_PCB_FLAGS_CONNECTED | 2806 SCTP_PCB_FLAGS_IN_TCPPOOL | 2807 SCTP_PCB_FLAGS_UNBOUND | 2808 (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) | 2809 SCTP_PCB_FLAGS_DONT_WAKE); 2810 inp->sctp_features = (*inp_p)->sctp_features; 2811 inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features; 2812 inp->sctp_socket = so; 2813 inp->sctp_frag_point = (*inp_p)->sctp_frag_point; 2814 inp->max_cwnd = (*inp_p)->max_cwnd; 2815 inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off; 2816 inp->ecn_supported = (*inp_p)->ecn_supported; 2817 inp->prsctp_supported = (*inp_p)->prsctp_supported; 2818 inp->auth_supported = (*inp_p)->auth_supported; 2819 inp->asconf_supported = (*inp_p)->asconf_supported; 2820 inp->reconfig_supported = (*inp_p)->reconfig_supported; 2821 inp->nrsack_supported = (*inp_p)->nrsack_supported; 2822 inp->pktdrop_supported = (*inp_p)->pktdrop_supported; 2823 inp->partial_delivery_point = (*inp_p)->partial_delivery_point; 2824 inp->sctp_context = (*inp_p)->sctp_context; 2825 inp->local_strreset_support = (*inp_p)->local_strreset_support; 2826 inp->fibnum = (*inp_p)->fibnum; 2827 inp->inp_starting_point_for_iterator = NULL; 2828 /* 2829 * copy in the authentication parameters from the 2830 * original endpoint 2831 */ 2832 if (inp->sctp_ep.local_hmacs) 2833 sctp_free_hmaclist(inp->sctp_ep.local_hmacs); 2834 inp->sctp_ep.local_hmacs = 2835 sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs); 2836 if (inp->sctp_ep.local_auth_chunks) 2837 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks); 2838 inp->sctp_ep.local_auth_chunks = 2839 sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks); 2840 2841 /* 2842 * Now we must move it from one hash table to 2843 * another and get the tcb in the right place. 2844 */ 2845 2846 /* 2847 * This is where the one-2-one socket is put into 2848 * the accept state waiting for the accept! 2849 */ 2850 if (*stcb) { 2851 (*stcb)->asoc.state |= SCTP_STATE_IN_ACCEPT_QUEUE; 2852 } 2853 sctp_move_pcb_and_assoc(*inp_p, inp, *stcb); 2854 2855 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2856 SCTP_TCB_UNLOCK((*stcb)); 2857 2858 sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb, 2859 0); 2860 SCTP_TCB_LOCK((*stcb)); 2861 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2862 2863 2864 /* 2865 * now we must check to see if we were aborted while 2866 * the move was going on and the lock/unlock 2867 * happened. 2868 */ 2869 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 2870 /* 2871 * yep it was, we leave the assoc attached 2872 * to the socket since the sctp_inpcb_free() 2873 * call will send an abort for us. 2874 */ 2875 SCTP_INP_DECR_REF(inp); 2876 return (NULL); 2877 } 2878 SCTP_INP_DECR_REF(inp); 2879 /* Switch over to the new guy */ 2880 *inp_p = inp; 2881 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2882 if (send_int_conf) { 2883 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2884 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2885 } 2886 /* 2887 * Pull it from the incomplete queue and wake the 2888 * guy 2889 */ 2890#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2891 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2892 SCTP_TCB_UNLOCK((*stcb)); 2893 SCTP_SOCKET_LOCK(so, 1); 2894#endif 2895 soisconnected(so); 2896#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2897 SCTP_TCB_LOCK((*stcb)); 2898 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2899 SCTP_SOCKET_UNLOCK(so, 1); 2900#endif 2901 return (m); 2902 } 2903 } 2904 if (notification) { 2905 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2906 } 2907 if (send_int_conf) { 2908 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2909 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2910 } 2911 return (m); 2912} 2913 2914static void 2915sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED, 2916 struct sctp_tcb *stcb, struct sctp_nets *net) 2917{ 2918 /* cp must not be used, others call this without a c-ack :-) */ 2919 struct sctp_association *asoc; 2920 2921 SCTPDBG(SCTP_DEBUG_INPUT2, 2922 "sctp_handle_cookie_ack: handling COOKIE-ACK\n"); 2923 if ((stcb == NULL) || (net == NULL)) { 2924 return; 2925 } 2926 asoc = &stcb->asoc; 2927 2928 sctp_stop_all_cookie_timers(stcb); 2929 /* process according to association state */ 2930 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) { 2931 /* state change only needed when I am in right state */ 2932 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2933 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 2934 sctp_start_net_timers(stcb); 2935 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2936 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2937 stcb->sctp_ep, stcb, asoc->primary_destination); 2938 2939 } 2940 /* update RTO */ 2941 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 2942 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2943 if (asoc->overall_error_count == 0) { 2944 net->RTO = sctp_calculate_rto(stcb, asoc, net, 2945 &asoc->time_entered, sctp_align_safe_nocopy, 2946 SCTP_RTT_FROM_NON_DATA); 2947 } 2948 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 2949 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2950 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2951 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 2952#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2953 struct socket *so; 2954 2955#endif 2956 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2957#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2958 so = SCTP_INP_SO(stcb->sctp_ep); 2959 atomic_add_int(&stcb->asoc.refcnt, 1); 2960 SCTP_TCB_UNLOCK(stcb); 2961 SCTP_SOCKET_LOCK(so, 1); 2962 SCTP_TCB_LOCK(stcb); 2963 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2964#endif 2965 if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) { 2966 soisconnected(stcb->sctp_socket); 2967 } 2968#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2969 SCTP_SOCKET_UNLOCK(so, 1); 2970#endif 2971 } 2972 /* 2973 * since we did not send a HB make sure we don't double 2974 * things 2975 */ 2976 net->hb_responded = 1; 2977 2978 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2979 /* 2980 * We don't need to do the asconf thing, nor hb or 2981 * autoclose if the socket is closed. 2982 */ 2983 goto closed_socket; 2984 } 2985 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 2986 stcb, net); 2987 2988 2989 if (stcb->asoc.sctp_autoclose_ticks && 2990 sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2991 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 2992 stcb->sctp_ep, stcb, NULL); 2993 } 2994 /* 2995 * send ASCONF if parameters are pending and ASCONFs are 2996 * allowed (eg. addresses changed when init/cookie echo were 2997 * in flight) 2998 */ 2999 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) && 3000 (stcb->asoc.asconf_supported == 1) && 3001 (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) { 3002#ifdef SCTP_TIMER_BASED_ASCONF 3003 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, 3004 stcb->sctp_ep, stcb, 3005 stcb->asoc.primary_destination); 3006#else 3007 sctp_send_asconf(stcb, stcb->asoc.primary_destination, 3008 SCTP_ADDR_NOT_LOCKED); 3009#endif 3010 } 3011 } 3012closed_socket: 3013 /* Toss the cookie if I can */ 3014 sctp_toss_old_cookies(stcb, asoc); 3015 if (!TAILQ_EMPTY(&asoc->sent_queue)) { 3016 /* Restart the timer if we have pending data */ 3017 struct sctp_tmit_chunk *chk; 3018 3019 chk = TAILQ_FIRST(&asoc->sent_queue); 3020 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 3021 } 3022} 3023 3024static void 3025sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp, 3026 struct sctp_tcb *stcb) 3027{ 3028 struct sctp_nets *net; 3029 struct sctp_tmit_chunk *lchk; 3030 struct sctp_ecne_chunk bkup; 3031 uint8_t override_bit; 3032 uint32_t tsn, window_data_tsn; 3033 int len; 3034 unsigned int pkt_cnt; 3035 3036 len = ntohs(cp->ch.chunk_length); 3037 if ((len != sizeof(struct sctp_ecne_chunk)) && 3038 (len != sizeof(struct old_sctp_ecne_chunk))) { 3039 return; 3040 } 3041 if (len == sizeof(struct old_sctp_ecne_chunk)) { 3042 /* Its the old format */ 3043 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk)); 3044 bkup.num_pkts_since_cwr = htonl(1); 3045 cp = &bkup; 3046 } 3047 SCTP_STAT_INCR(sctps_recvecne); 3048 tsn = ntohl(cp->tsn); 3049 pkt_cnt = ntohl(cp->num_pkts_since_cwr); 3050 lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead); 3051 if (lchk == NULL) { 3052 window_data_tsn = stcb->asoc.sending_seq - 1; 3053 } else { 3054 window_data_tsn = lchk->rec.data.TSN_seq; 3055 } 3056 3057 /* Find where it was sent to if possible. */ 3058 net = NULL; 3059 TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) { 3060 if (lchk->rec.data.TSN_seq == tsn) { 3061 net = lchk->whoTo; 3062 net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send; 3063 break; 3064 } 3065 if (SCTP_TSN_GT(lchk->rec.data.TSN_seq, tsn)) { 3066 break; 3067 } 3068 } 3069 if (net == NULL) { 3070 /* 3071 * What to do. A previous send of a CWR was possibly lost. 3072 * See how old it is, we may have it marked on the actual 3073 * net. 3074 */ 3075 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 3076 if (tsn == net->last_cwr_tsn) { 3077 /* Found him, send it off */ 3078 break; 3079 } 3080 } 3081 if (net == NULL) { 3082 /* 3083 * If we reach here, we need to send a special CWR 3084 * that says hey, we did this a long time ago and 3085 * you lost the response. 3086 */ 3087 net = TAILQ_FIRST(&stcb->asoc.nets); 3088 if (net == NULL) { 3089 /* TSNH */ 3090 return; 3091 } 3092 override_bit = SCTP_CWR_REDUCE_OVERRIDE; 3093 } else { 3094 override_bit = 0; 3095 } 3096 } else { 3097 override_bit = 0; 3098 } 3099 if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) && 3100 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 3101 /* 3102 * JRS - Use the congestion control given in the pluggable 3103 * CC module 3104 */ 3105 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt); 3106 /* 3107 * We reduce once every RTT. So we will only lower cwnd at 3108 * the next sending seq i.e. the window_data_tsn 3109 */ 3110 net->cwr_window_tsn = window_data_tsn; 3111 net->ecn_ce_pkt_cnt += pkt_cnt; 3112 net->lost_cnt = pkt_cnt; 3113 net->last_cwr_tsn = tsn; 3114 } else { 3115 override_bit |= SCTP_CWR_IN_SAME_WINDOW; 3116 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) && 3117 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 3118 /* 3119 * Another loss in the same window update how many 3120 * marks/packets lost we have had. 3121 */ 3122 int cnt = 1; 3123 3124 if (pkt_cnt > net->lost_cnt) { 3125 /* Should be the case */ 3126 cnt = (pkt_cnt - net->lost_cnt); 3127 net->ecn_ce_pkt_cnt += cnt; 3128 } 3129 net->lost_cnt = pkt_cnt; 3130 net->last_cwr_tsn = tsn; 3131 /* 3132 * Most CC functions will ignore this call, since we 3133 * are in-window yet of the initial CE the peer saw. 3134 */ 3135 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt); 3136 } 3137 } 3138 /* 3139 * We always send a CWR this way if our previous one was lost our 3140 * peer will get an update, or if it is not time again to reduce we 3141 * still get the cwr to the peer. Note we set the override when we 3142 * could not find the TSN on the chunk or the destination network. 3143 */ 3144 sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit); 3145} 3146 3147static void 3148sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net) 3149{ 3150 /* 3151 * Here we get a CWR from the peer. We must look in the outqueue and 3152 * make sure that we have a covered ECNE in the control chunk part. 3153 * If so remove it. 3154 */ 3155 struct sctp_tmit_chunk *chk; 3156 struct sctp_ecne_chunk *ecne; 3157 int override; 3158 uint32_t cwr_tsn; 3159 3160 cwr_tsn = ntohl(cp->tsn); 3161 override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE; 3162 TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) { 3163 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) { 3164 continue; 3165 } 3166 if ((override == 0) && (chk->whoTo != net)) { 3167 /* Must be from the right src unless override is set */ 3168 continue; 3169 } 3170 ecne = mtod(chk->data, struct sctp_ecne_chunk *); 3171 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) { 3172 /* this covers this ECNE, we can remove it */ 3173 stcb->asoc.ecn_echo_cnt_onq--; 3174 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, 3175 sctp_next); 3176 sctp_m_freem(chk->data); 3177 chk->data = NULL; 3178 stcb->asoc.ctrl_queue_cnt--; 3179 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3180 if (override == 0) { 3181 break; 3182 } 3183 } 3184 } 3185} 3186 3187static void 3188sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED, 3189 struct sctp_tcb *stcb, struct sctp_nets *net) 3190{ 3191 struct sctp_association *asoc; 3192 3193#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3194 struct socket *so; 3195 3196#endif 3197 3198 SCTPDBG(SCTP_DEBUG_INPUT2, 3199 "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n"); 3200 if (stcb == NULL) 3201 return; 3202 3203 asoc = &stcb->asoc; 3204 /* process according to association state */ 3205 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 3206 /* unexpected SHUTDOWN-COMPLETE... so ignore... */ 3207 SCTPDBG(SCTP_DEBUG_INPUT2, 3208 "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n"); 3209 SCTP_TCB_UNLOCK(stcb); 3210 return; 3211 } 3212 /* notify upper layer protocol */ 3213 if (stcb->sctp_socket) { 3214 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 3215 } 3216#ifdef INVARIANTS 3217 if (!TAILQ_EMPTY(&asoc->send_queue) || 3218 !TAILQ_EMPTY(&asoc->sent_queue) || 3219 !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 3220 panic("Queues are not empty when handling SHUTDOWN-COMPLETE"); 3221 } 3222#endif 3223 /* stop the timer */ 3224 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, 3225 SCTP_FROM_SCTP_INPUT + SCTP_LOC_24); 3226 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 3227 /* free the TCB */ 3228 SCTPDBG(SCTP_DEBUG_INPUT2, 3229 "sctp_handle_shutdown_complete: calls free-asoc\n"); 3230#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3231 so = SCTP_INP_SO(stcb->sctp_ep); 3232 atomic_add_int(&stcb->asoc.refcnt, 1); 3233 SCTP_TCB_UNLOCK(stcb); 3234 SCTP_SOCKET_LOCK(so, 1); 3235 SCTP_TCB_LOCK(stcb); 3236 atomic_subtract_int(&stcb->asoc.refcnt, 1); 3237#endif 3238 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 3239 SCTP_FROM_SCTP_INPUT + SCTP_LOC_25); 3240#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3241 SCTP_SOCKET_UNLOCK(so, 1); 3242#endif 3243 return; 3244} 3245 3246static int 3247process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc, 3248 struct sctp_nets *net, uint8_t flg) 3249{ 3250 switch (desc->chunk_type) { 3251 case SCTP_DATA: 3252 /* find the tsn to resend (possibly */ 3253 { 3254 uint32_t tsn; 3255 struct sctp_tmit_chunk *tp1; 3256 3257 tsn = ntohl(desc->tsn_ifany); 3258 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3259 if (tp1->rec.data.TSN_seq == tsn) { 3260 /* found it */ 3261 break; 3262 } 3263 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, tsn)) { 3264 /* not found */ 3265 tp1 = NULL; 3266 break; 3267 } 3268 } 3269 if (tp1 == NULL) { 3270 /* 3271 * Do it the other way , aka without paying 3272 * attention to queue seq order. 3273 */ 3274 SCTP_STAT_INCR(sctps_pdrpdnfnd); 3275 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3276 if (tp1->rec.data.TSN_seq == tsn) { 3277 /* found it */ 3278 break; 3279 } 3280 } 3281 } 3282 if (tp1 == NULL) { 3283 SCTP_STAT_INCR(sctps_pdrptsnnf); 3284 } 3285 if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) { 3286 uint8_t *ddp; 3287 3288 if (((flg & SCTP_BADCRC) == 0) && 3289 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3290 return (0); 3291 } 3292 if ((stcb->asoc.peers_rwnd == 0) && 3293 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3294 SCTP_STAT_INCR(sctps_pdrpdiwnp); 3295 return (0); 3296 } 3297 if (stcb->asoc.peers_rwnd == 0 && 3298 (flg & SCTP_FROM_MIDDLE_BOX)) { 3299 SCTP_STAT_INCR(sctps_pdrpdizrw); 3300 return (0); 3301 } 3302 ddp = (uint8_t *) (mtod(tp1->data, caddr_t)+ 3303 sizeof(struct sctp_data_chunk)); 3304 { 3305 unsigned int iii; 3306 3307 for (iii = 0; iii < sizeof(desc->data_bytes); 3308 iii++) { 3309 if (ddp[iii] != desc->data_bytes[iii]) { 3310 SCTP_STAT_INCR(sctps_pdrpbadd); 3311 return (-1); 3312 } 3313 } 3314 } 3315 3316 if (tp1->do_rtt) { 3317 /* 3318 * this guy had a RTO calculation 3319 * pending on it, cancel it 3320 */ 3321 if (tp1->whoTo->rto_needed == 0) { 3322 tp1->whoTo->rto_needed = 1; 3323 } 3324 tp1->do_rtt = 0; 3325 } 3326 SCTP_STAT_INCR(sctps_pdrpmark); 3327 if (tp1->sent != SCTP_DATAGRAM_RESEND) 3328 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3329 /* 3330 * mark it as if we were doing a FR, since 3331 * we will be getting gap ack reports behind 3332 * the info from the router. 3333 */ 3334 tp1->rec.data.doing_fast_retransmit = 1; 3335 /* 3336 * mark the tsn with what sequences can 3337 * cause a new FR. 3338 */ 3339 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) { 3340 tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq; 3341 } else { 3342 tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq; 3343 } 3344 3345 /* restart the timer */ 3346 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3347 stcb, tp1->whoTo, 3348 SCTP_FROM_SCTP_INPUT + SCTP_LOC_26); 3349 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3350 stcb, tp1->whoTo); 3351 3352 /* fix counts and things */ 3353 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 3354 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP, 3355 tp1->whoTo->flight_size, 3356 tp1->book_size, 3357 (uint32_t) (uintptr_t) stcb, 3358 tp1->rec.data.TSN_seq); 3359 } 3360 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3361 sctp_flight_size_decrease(tp1); 3362 sctp_total_flight_decrease(stcb, tp1); 3363 } 3364 tp1->sent = SCTP_DATAGRAM_RESEND; 3365 } { 3366 /* audit code */ 3367 unsigned int audit; 3368 3369 audit = 0; 3370 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3371 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3372 audit++; 3373 } 3374 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue, 3375 sctp_next) { 3376 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3377 audit++; 3378 } 3379 if (audit != stcb->asoc.sent_queue_retran_cnt) { 3380 SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n", 3381 audit, stcb->asoc.sent_queue_retran_cnt); 3382#ifndef SCTP_AUDITING_ENABLED 3383 stcb->asoc.sent_queue_retran_cnt = audit; 3384#endif 3385 } 3386 } 3387 } 3388 break; 3389 case SCTP_ASCONF: 3390 { 3391 struct sctp_tmit_chunk *asconf; 3392 3393 TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue, 3394 sctp_next) { 3395 if (asconf->rec.chunk_id.id == SCTP_ASCONF) { 3396 break; 3397 } 3398 } 3399 if (asconf) { 3400 if (asconf->sent != SCTP_DATAGRAM_RESEND) 3401 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3402 asconf->sent = SCTP_DATAGRAM_RESEND; 3403 asconf->snd_count--; 3404 } 3405 } 3406 break; 3407 case SCTP_INITIATION: 3408 /* resend the INIT */ 3409 stcb->asoc.dropped_special_cnt++; 3410 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) { 3411 /* 3412 * If we can get it in, in a few attempts we do 3413 * this, otherwise we let the timer fire. 3414 */ 3415 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, 3416 stcb, net, 3417 SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 3418 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 3419 } 3420 break; 3421 case SCTP_SELECTIVE_ACK: 3422 case SCTP_NR_SELECTIVE_ACK: 3423 /* resend the sack */ 3424 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED); 3425 break; 3426 case SCTP_HEARTBEAT_REQUEST: 3427 /* resend a demand HB */ 3428 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) { 3429 /* 3430 * Only retransmit if we KNOW we wont destroy the 3431 * tcb 3432 */ 3433 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 3434 } 3435 break; 3436 case SCTP_SHUTDOWN: 3437 sctp_send_shutdown(stcb, net); 3438 break; 3439 case SCTP_SHUTDOWN_ACK: 3440 sctp_send_shutdown_ack(stcb, net); 3441 break; 3442 case SCTP_COOKIE_ECHO: 3443 { 3444 struct sctp_tmit_chunk *cookie; 3445 3446 cookie = NULL; 3447 TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, 3448 sctp_next) { 3449 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) { 3450 break; 3451 } 3452 } 3453 if (cookie) { 3454 if (cookie->sent != SCTP_DATAGRAM_RESEND) 3455 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3456 cookie->sent = SCTP_DATAGRAM_RESEND; 3457 sctp_stop_all_cookie_timers(stcb); 3458 } 3459 } 3460 break; 3461 case SCTP_COOKIE_ACK: 3462 sctp_send_cookie_ack(stcb); 3463 break; 3464 case SCTP_ASCONF_ACK: 3465 /* resend last asconf ack */ 3466 sctp_send_asconf_ack(stcb); 3467 break; 3468 case SCTP_IFORWARD_CUM_TSN: 3469 case SCTP_FORWARD_CUM_TSN: 3470 send_forward_tsn(stcb, &stcb->asoc); 3471 break; 3472 /* can't do anything with these */ 3473 case SCTP_PACKET_DROPPED: 3474 case SCTP_INITIATION_ACK: /* this should not happen */ 3475 case SCTP_HEARTBEAT_ACK: 3476 case SCTP_ABORT_ASSOCIATION: 3477 case SCTP_OPERATION_ERROR: 3478 case SCTP_SHUTDOWN_COMPLETE: 3479 case SCTP_ECN_ECHO: 3480 case SCTP_ECN_CWR: 3481 default: 3482 break; 3483 } 3484 return (0); 3485} 3486 3487void 3488sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list) 3489{ 3490 uint32_t i; 3491 uint16_t temp; 3492 3493 /* 3494 * We set things to 0xffffffff since this is the last delivered 3495 * sequence and we will be sending in 0 after the reset. 3496 */ 3497 3498 if (number_entries) { 3499 for (i = 0; i < number_entries; i++) { 3500 temp = ntohs(list[i]); 3501 if (temp >= stcb->asoc.streamincnt) { 3502 continue; 3503 } 3504 stcb->asoc.strmin[temp].last_sequence_delivered = 0xffffffff; 3505 } 3506 } else { 3507 list = NULL; 3508 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3509 stcb->asoc.strmin[i].last_sequence_delivered = 0xffffffff; 3510 } 3511 } 3512 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3513} 3514 3515static void 3516sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list) 3517{ 3518 uint32_t i; 3519 uint16_t temp; 3520 3521 if (number_entries > 0) { 3522 for (i = 0; i < number_entries; i++) { 3523 temp = ntohs(list[i]); 3524 if (temp >= stcb->asoc.streamoutcnt) { 3525 /* no such stream */ 3526 continue; 3527 } 3528 stcb->asoc.strmout[temp].next_sequence_send = 0; 3529 } 3530 } else { 3531 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3532 stcb->asoc.strmout[i].next_sequence_send = 0; 3533 } 3534 } 3535 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3536} 3537 3538static void 3539sctp_reset_clear_pending(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list) 3540{ 3541 uint32_t i; 3542 uint16_t temp; 3543 3544 if (number_entries > 0) { 3545 for (i = 0; i < number_entries; i++) { 3546 temp = ntohs(list[i]); 3547 if (temp >= stcb->asoc.streamoutcnt) { 3548 /* no such stream */ 3549 continue; 3550 } 3551 stcb->asoc.strmout[temp].state = SCTP_STREAM_OPEN; 3552 } 3553 } else { 3554 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3555 stcb->asoc.strmout[i].state = SCTP_STREAM_OPEN; 3556 } 3557 } 3558} 3559 3560 3561struct sctp_stream_reset_request * 3562sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk) 3563{ 3564 struct sctp_association *asoc; 3565 struct sctp_chunkhdr *ch; 3566 struct sctp_stream_reset_request *r; 3567 struct sctp_tmit_chunk *chk; 3568 int len, clen; 3569 3570 asoc = &stcb->asoc; 3571 if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 3572 asoc->stream_reset_outstanding = 0; 3573 return (NULL); 3574 } 3575 if (stcb->asoc.str_reset == NULL) { 3576 asoc->stream_reset_outstanding = 0; 3577 return (NULL); 3578 } 3579 chk = stcb->asoc.str_reset; 3580 if (chk->data == NULL) { 3581 return (NULL); 3582 } 3583 if (bchk) { 3584 /* he wants a copy of the chk pointer */ 3585 *bchk = chk; 3586 } 3587 clen = chk->send_size; 3588 ch = mtod(chk->data, struct sctp_chunkhdr *); 3589 r = (struct sctp_stream_reset_request *)(ch + 1); 3590 if (ntohl(r->request_seq) == seq) { 3591 /* found it */ 3592 return (r); 3593 } 3594 len = SCTP_SIZE32(ntohs(r->ph.param_length)); 3595 if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) { 3596 /* move to the next one, there can only be a max of two */ 3597 r = (struct sctp_stream_reset_request *)((caddr_t)r + len); 3598 if (ntohl(r->request_seq) == seq) { 3599 return (r); 3600 } 3601 } 3602 /* that seq is not here */ 3603 return (NULL); 3604} 3605 3606static void 3607sctp_clean_up_stream_reset(struct sctp_tcb *stcb) 3608{ 3609 struct sctp_association *asoc; 3610 struct sctp_tmit_chunk *chk = stcb->asoc.str_reset; 3611 3612 if (stcb->asoc.str_reset == NULL) { 3613 return; 3614 } 3615 asoc = &stcb->asoc; 3616 3617 sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, 3618 chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_28); 3619 TAILQ_REMOVE(&asoc->control_send_queue, 3620 chk, 3621 sctp_next); 3622 if (chk->data) { 3623 sctp_m_freem(chk->data); 3624 chk->data = NULL; 3625 } 3626 asoc->ctrl_queue_cnt--; 3627 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3628 /* sa_ignore NO_NULL_CHK */ 3629 stcb->asoc.str_reset = NULL; 3630} 3631 3632 3633static int 3634sctp_handle_stream_reset_response(struct sctp_tcb *stcb, 3635 uint32_t seq, uint32_t action, 3636 struct sctp_stream_reset_response *respin) 3637{ 3638 uint16_t type; 3639 int lparm_len; 3640 struct sctp_association *asoc = &stcb->asoc; 3641 struct sctp_tmit_chunk *chk; 3642 struct sctp_stream_reset_request *req_param; 3643 struct sctp_stream_reset_out_request *req_out_param; 3644 struct sctp_stream_reset_in_request *req_in_param; 3645 uint32_t number_entries; 3646 3647 if (asoc->stream_reset_outstanding == 0) { 3648 /* duplicate */ 3649 return (0); 3650 } 3651 if (seq == stcb->asoc.str_reset_seq_out) { 3652 req_param = sctp_find_stream_reset(stcb, seq, &chk); 3653 if (req_param != NULL) { 3654 stcb->asoc.str_reset_seq_out++; 3655 type = ntohs(req_param->ph.param_type); 3656 lparm_len = ntohs(req_param->ph.param_length); 3657 if (type == SCTP_STR_RESET_OUT_REQUEST) { 3658 int no_clear = 0; 3659 3660 req_out_param = (struct sctp_stream_reset_out_request *)req_param; 3661 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t); 3662 asoc->stream_reset_out_is_outstanding = 0; 3663 if (asoc->stream_reset_outstanding) 3664 asoc->stream_reset_outstanding--; 3665 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3666 /* do it */ 3667 sctp_reset_out_streams(stcb, number_entries, req_out_param->list_of_streams); 3668 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3669 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3670 } else if (action == SCTP_STREAM_RESET_RESULT_IN_PROGRESS) { 3671 /* 3672 * Set it up so we don't stop 3673 * retransmitting 3674 */ 3675 asoc->stream_reset_outstanding++; 3676 stcb->asoc.str_reset_seq_out--; 3677 asoc->stream_reset_out_is_outstanding = 1; 3678 no_clear = 1; 3679 } else { 3680 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3681 } 3682 if (no_clear == 0) { 3683 sctp_reset_clear_pending(stcb, number_entries, req_out_param->list_of_streams); 3684 } 3685 } else if (type == SCTP_STR_RESET_IN_REQUEST) { 3686 req_in_param = (struct sctp_stream_reset_in_request *)req_param; 3687 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t); 3688 if (asoc->stream_reset_outstanding) 3689 asoc->stream_reset_outstanding--; 3690 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3691 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb, 3692 number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3693 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3694 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb, 3695 number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3696 } 3697 } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) { 3698 /* Ok we now may have more streams */ 3699 int num_stream; 3700 3701 num_stream = stcb->asoc.strm_pending_add_size; 3702 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) { 3703 /* TSNH */ 3704 num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt; 3705 } 3706 stcb->asoc.strm_pending_add_size = 0; 3707 if (asoc->stream_reset_outstanding) 3708 asoc->stream_reset_outstanding--; 3709 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3710 /* Put the new streams into effect */ 3711 int i; 3712 3713 for (i = asoc->streamoutcnt; i < (asoc->streamoutcnt + num_stream); i++) { 3714 asoc->strmout[i].state = SCTP_STREAM_OPEN; 3715 } 3716 asoc->streamoutcnt += num_stream; 3717 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 3718 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3719 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3720 SCTP_STREAM_CHANGE_DENIED); 3721 } else { 3722 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3723 SCTP_STREAM_CHANGE_FAILED); 3724 } 3725 } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) { 3726 if (asoc->stream_reset_outstanding) 3727 asoc->stream_reset_outstanding--; 3728 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3729 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3730 SCTP_STREAM_CHANGE_DENIED); 3731 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3732 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3733 SCTP_STREAM_CHANGE_FAILED); 3734 } 3735 } else if (type == SCTP_STR_RESET_TSN_REQUEST) { 3736 /** 3737 * a) Adopt the new in tsn. 3738 * b) reset the map 3739 * c) Adopt the new out-tsn 3740 */ 3741 struct sctp_stream_reset_response_tsn *resp; 3742 struct sctp_forward_tsn_chunk fwdtsn; 3743 int abort_flag = 0; 3744 3745 if (respin == NULL) { 3746 /* huh ? */ 3747 return (0); 3748 } 3749 if (ntohs(respin->ph.param_length) < sizeof(struct sctp_stream_reset_response_tsn)) { 3750 return (0); 3751 } 3752 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3753 resp = (struct sctp_stream_reset_response_tsn *)respin; 3754 asoc->stream_reset_outstanding--; 3755 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3756 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3757 fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1); 3758 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3759 if (abort_flag) { 3760 return (1); 3761 } 3762 stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1); 3763 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3764 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3765 } 3766 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 3767 stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn); 3768 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 3769 3770 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map; 3771 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size); 3772 3773 stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn); 3774 stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn; 3775 3776 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL); 3777 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL); 3778 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0); 3779 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3780 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3781 SCTP_ASSOC_RESET_DENIED); 3782 } else { 3783 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3784 SCTP_ASSOC_RESET_FAILED); 3785 } 3786 } 3787 /* get rid of the request and get the request flags */ 3788 if (asoc->stream_reset_outstanding == 0) { 3789 sctp_clean_up_stream_reset(stcb); 3790 } 3791 } 3792 } 3793 if (asoc->stream_reset_outstanding == 0) { 3794 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED); 3795 } 3796 return (0); 3797} 3798 3799static void 3800sctp_handle_str_reset_request_in(struct sctp_tcb *stcb, 3801 struct sctp_tmit_chunk *chk, 3802 struct sctp_stream_reset_in_request *req, int trunc) 3803{ 3804 uint32_t seq; 3805 int len, i; 3806 int number_entries; 3807 uint16_t temp; 3808 3809 /* 3810 * peer wants me to send a str-reset to him for my outgoing seq's if 3811 * seq_in is right. 3812 */ 3813 struct sctp_association *asoc = &stcb->asoc; 3814 3815 seq = ntohl(req->request_seq); 3816 if (asoc->str_reset_seq_in == seq) { 3817 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3818 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3819 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3820 } else if (trunc) { 3821 /* Can't do it, since they exceeded our buffer size */ 3822 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3823 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) { 3824 len = ntohs(req->ph.param_length); 3825 number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t)); 3826 if (number_entries) { 3827 for (i = 0; i < number_entries; i++) { 3828 temp = ntohs(req->list_of_streams[i]); 3829 if (temp >= stcb->asoc.streamoutcnt) { 3830 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3831 goto bad_boy; 3832 } 3833 req->list_of_streams[i] = temp; 3834 } 3835 for (i = 0; i < number_entries; i++) { 3836 if (stcb->asoc.strmout[req->list_of_streams[i]].state == SCTP_STREAM_OPEN) { 3837 stcb->asoc.strmout[req->list_of_streams[i]].state = SCTP_STREAM_RESET_PENDING; 3838 } 3839 } 3840 } else { 3841 /* Its all */ 3842 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3843 if (stcb->asoc.strmout[i].state == SCTP_STREAM_OPEN) 3844 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_PENDING; 3845 } 3846 } 3847 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3848 } else { 3849 /* Can't do it, since we have sent one out */ 3850 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 3851 } 3852bad_boy: 3853 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3854 asoc->str_reset_seq_in++; 3855 } else if (asoc->str_reset_seq_in - 1 == seq) { 3856 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3857 } else if (asoc->str_reset_seq_in - 2 == seq) { 3858 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3859 } else { 3860 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3861 } 3862 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED); 3863} 3864 3865static int 3866sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb, 3867 struct sctp_tmit_chunk *chk, 3868 struct sctp_stream_reset_tsn_request *req) 3869{ 3870 /* reset all in and out and update the tsn */ 3871 /* 3872 * A) reset my str-seq's on in and out. B) Select a receive next, 3873 * and set cum-ack to it. Also process this selected number as a 3874 * fwd-tsn as well. C) set in the response my next sending seq. 3875 */ 3876 struct sctp_forward_tsn_chunk fwdtsn; 3877 struct sctp_association *asoc = &stcb->asoc; 3878 int abort_flag = 0; 3879 uint32_t seq; 3880 3881 seq = ntohl(req->request_seq); 3882 if (asoc->str_reset_seq_in == seq) { 3883 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3884 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 3885 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3886 } else { 3887 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3888 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3889 fwdtsn.ch.chunk_flags = 0; 3890 fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1); 3891 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3892 if (abort_flag) { 3893 return (1); 3894 } 3895 asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA; 3896 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3897 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3898 } 3899 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map; 3900 asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1; 3901 memset(asoc->mapping_array, 0, asoc->mapping_array_size); 3902 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 3903 memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size); 3904 atomic_add_int(&asoc->sending_seq, 1); 3905 /* save off historical data for retrans */ 3906 asoc->last_sending_seq[1] = asoc->last_sending_seq[0]; 3907 asoc->last_sending_seq[0] = asoc->sending_seq; 3908 asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0]; 3909 asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn; 3910 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL); 3911 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL); 3912 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3913 sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0); 3914 } 3915 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3916 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3917 asoc->str_reset_seq_in++; 3918 } else if (asoc->str_reset_seq_in - 1 == seq) { 3919 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3920 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3921 } else if (asoc->str_reset_seq_in - 2 == seq) { 3922 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1], 3923 asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]); 3924 } else { 3925 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3926 } 3927 return (0); 3928} 3929 3930static void 3931sctp_handle_str_reset_request_out(struct sctp_tcb *stcb, 3932 struct sctp_tmit_chunk *chk, 3933 struct sctp_stream_reset_out_request *req, int trunc) 3934{ 3935 uint32_t seq, tsn; 3936 int number_entries, len; 3937 struct sctp_association *asoc = &stcb->asoc; 3938 3939 seq = ntohl(req->request_seq); 3940 3941 /* now if its not a duplicate we process it */ 3942 if (asoc->str_reset_seq_in == seq) { 3943 len = ntohs(req->ph.param_length); 3944 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t)); 3945 /* 3946 * the sender is resetting, handle the list issue.. we must 3947 * a) verify if we can do the reset, if so no problem b) If 3948 * we can't do the reset we must copy the request. c) queue 3949 * it, and setup the data in processor to trigger it off 3950 * when needed and dequeue all the queued data. 3951 */ 3952 tsn = ntohl(req->send_reset_at_tsn); 3953 3954 /* move the reset action back one */ 3955 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3956 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3957 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3958 } else if (trunc) { 3959 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3960 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) { 3961 /* we can do it now */ 3962 sctp_reset_in_stream(stcb, number_entries, req->list_of_streams); 3963 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3964 } else { 3965 /* 3966 * we must queue it up and thus wait for the TSN's 3967 * to arrive that are at or before tsn 3968 */ 3969 struct sctp_stream_reset_list *liste; 3970 int siz; 3971 3972 siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t)); 3973 SCTP_MALLOC(liste, struct sctp_stream_reset_list *, 3974 siz, SCTP_M_STRESET); 3975 if (liste == NULL) { 3976 /* gak out of memory */ 3977 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3978 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3979 return; 3980 } 3981 liste->seq = seq; 3982 liste->tsn = tsn; 3983 liste->number_entries = number_entries; 3984 memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t)); 3985 TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp); 3986 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_IN_PROGRESS; 3987 } 3988 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3989 asoc->str_reset_seq_in++; 3990 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3991 /* 3992 * one seq back, just echo back last action since my 3993 * response was lost. 3994 */ 3995 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3996 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3997 /* 3998 * two seq back, just echo back last action since my 3999 * response was lost. 4000 */ 4001 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 4002 } else { 4003 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 4004 } 4005} 4006 4007static void 4008sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 4009 struct sctp_stream_reset_add_strm *str_add) 4010{ 4011 /* 4012 * Peer is requesting to add more streams. If its within our 4013 * max-streams we will allow it. 4014 */ 4015 uint32_t num_stream, i; 4016 uint32_t seq; 4017 struct sctp_association *asoc = &stcb->asoc; 4018 struct sctp_queued_to_read *ctl, *nctl; 4019 4020 /* Get the number. */ 4021 seq = ntohl(str_add->request_seq); 4022 num_stream = ntohs(str_add->number_of_streams); 4023 /* Now what would be the new total? */ 4024 if (asoc->str_reset_seq_in == seq) { 4025 num_stream += stcb->asoc.streamincnt; 4026 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 4027 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 4028 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4029 } else if ((num_stream > stcb->asoc.max_inbound_streams) || 4030 (num_stream > 0xffff)) { 4031 /* We must reject it they ask for to many */ 4032 denied: 4033 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4034 } else { 4035 /* Ok, we can do that :-) */ 4036 struct sctp_stream_in *oldstrm; 4037 4038 /* save off the old */ 4039 oldstrm = stcb->asoc.strmin; 4040 SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *, 4041 (num_stream * sizeof(struct sctp_stream_in)), 4042 SCTP_M_STRMI); 4043 if (stcb->asoc.strmin == NULL) { 4044 stcb->asoc.strmin = oldstrm; 4045 goto denied; 4046 } 4047 /* copy off the old data */ 4048 for (i = 0; i < stcb->asoc.streamincnt; i++) { 4049 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 4050 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue); 4051 stcb->asoc.strmin[i].stream_no = i; 4052 stcb->asoc.strmin[i].last_sequence_delivered = oldstrm[i].last_sequence_delivered; 4053 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started; 4054 stcb->asoc.strmin[i].pd_api_started = oldstrm[i].pd_api_started; 4055 /* now anything on those queues? */ 4056 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next_instrm, nctl) { 4057 TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next_instrm); 4058 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next_instrm); 4059 } 4060 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].uno_inqueue, next_instrm, nctl) { 4061 TAILQ_REMOVE(&oldstrm[i].uno_inqueue, ctl, next_instrm); 4062 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].uno_inqueue, ctl, next_instrm); 4063 } 4064 } 4065 /* Init the new streams */ 4066 for (i = stcb->asoc.streamincnt; i < num_stream; i++) { 4067 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 4068 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue); 4069 stcb->asoc.strmin[i].stream_no = i; 4070 stcb->asoc.strmin[i].last_sequence_delivered = 0xffffffff; 4071 stcb->asoc.strmin[i].pd_api_started = 0; 4072 stcb->asoc.strmin[i].delivery_started = 0; 4073 } 4074 SCTP_FREE(oldstrm, SCTP_M_STRMI); 4075 /* update the size */ 4076 stcb->asoc.streamincnt = num_stream; 4077 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 4078 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 4079 } 4080 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4081 asoc->str_reset_seq_in++; 4082 } else if ((asoc->str_reset_seq_in - 1) == seq) { 4083 /* 4084 * one seq back, just echo back last action since my 4085 * response was lost. 4086 */ 4087 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4088 } else if ((asoc->str_reset_seq_in - 2) == seq) { 4089 /* 4090 * two seq back, just echo back last action since my 4091 * response was lost. 4092 */ 4093 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 4094 } else { 4095 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 4096 4097 } 4098} 4099 4100static void 4101sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 4102 struct sctp_stream_reset_add_strm *str_add) 4103{ 4104 /* 4105 * Peer is requesting to add more streams. If its within our 4106 * max-streams we will allow it. 4107 */ 4108 uint16_t num_stream; 4109 uint32_t seq; 4110 struct sctp_association *asoc = &stcb->asoc; 4111 4112 /* Get the number. */ 4113 seq = ntohl(str_add->request_seq); 4114 num_stream = ntohs(str_add->number_of_streams); 4115 /* Now what would be the new total? */ 4116 if (asoc->str_reset_seq_in == seq) { 4117 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 4118 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 4119 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4120 } else if (stcb->asoc.stream_reset_outstanding) { 4121 /* We must reject it we have something pending */ 4122 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 4123 } else { 4124 /* Ok, we can do that :-) */ 4125 int mychk; 4126 4127 mychk = stcb->asoc.streamoutcnt; 4128 mychk += num_stream; 4129 if (mychk < 0x10000) { 4130 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 4131 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 1, num_stream, 0, 1)) { 4132 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4133 } 4134 } else { 4135 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4136 } 4137 } 4138 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]); 4139 asoc->str_reset_seq_in++; 4140 } else if ((asoc->str_reset_seq_in - 1) == seq) { 4141 /* 4142 * one seq back, just echo back last action since my 4143 * response was lost. 4144 */ 4145 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4146 } else if ((asoc->str_reset_seq_in - 2) == seq) { 4147 /* 4148 * two seq back, just echo back last action since my 4149 * response was lost. 4150 */ 4151 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 4152 } else { 4153 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 4154 } 4155} 4156 4157#ifdef __GNUC__ 4158__attribute__((noinline)) 4159#endif 4160 static int 4161 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset, 4162 struct sctp_chunkhdr *ch_req) 4163{ 4164 uint16_t remaining_length, param_len, ptype; 4165 struct sctp_paramhdr pstore; 4166 uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE]; 4167 uint32_t seq = 0; 4168 int num_req = 0; 4169 int trunc = 0; 4170 struct sctp_tmit_chunk *chk; 4171 struct sctp_chunkhdr *ch; 4172 struct sctp_paramhdr *ph; 4173 int ret_code = 0; 4174 int num_param = 0; 4175 4176 /* now it may be a reset or a reset-response */ 4177 remaining_length = ntohs(ch_req->chunk_length) - sizeof(struct sctp_chunkhdr); 4178 4179 /* setup for adding the response */ 4180 sctp_alloc_a_chunk(stcb, chk); 4181 if (chk == NULL) { 4182 return (ret_code); 4183 } 4184 chk->copy_by_ref = 0; 4185 chk->rec.chunk_id.id = SCTP_STREAM_RESET; 4186 chk->rec.chunk_id.can_take_data = 0; 4187 chk->flags = 0; 4188 chk->asoc = &stcb->asoc; 4189 chk->no_fr_allowed = 0; 4190 chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr); 4191 chk->book_size_scale = 0; 4192 chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA); 4193 if (chk->data == NULL) { 4194strres_nochunk: 4195 if (chk->data) { 4196 sctp_m_freem(chk->data); 4197 chk->data = NULL; 4198 } 4199 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 4200 return (ret_code); 4201 } 4202 SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD); 4203 4204 /* setup chunk parameters */ 4205 chk->sent = SCTP_DATAGRAM_UNSENT; 4206 chk->snd_count = 0; 4207 chk->whoTo = NULL; 4208 4209 ch = mtod(chk->data, struct sctp_chunkhdr *); 4210 ch->chunk_type = SCTP_STREAM_RESET; 4211 ch->chunk_flags = 0; 4212 ch->chunk_length = htons(chk->send_size); 4213 SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size); 4214 offset += sizeof(struct sctp_chunkhdr); 4215 while (remaining_length >= sizeof(struct sctp_paramhdr)) { 4216 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *) & pstore); 4217 if (ph == NULL) { 4218 /* TSNH */ 4219 break; 4220 } 4221 param_len = ntohs(ph->param_length); 4222 if ((param_len > remaining_length) || 4223 (param_len < (sizeof(struct sctp_paramhdr) + sizeof(uint32_t)))) { 4224 /* bad parameter length */ 4225 break; 4226 } 4227 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, sizeof(cstore)), 4228 (uint8_t *) & cstore); 4229 if (ph == NULL) { 4230 /* TSNH */ 4231 break; 4232 } 4233 ptype = ntohs(ph->param_type); 4234 num_param++; 4235 if (param_len > sizeof(cstore)) { 4236 trunc = 1; 4237 } else { 4238 trunc = 0; 4239 } 4240 if (num_param > SCTP_MAX_RESET_PARAMS) { 4241 /* hit the max of parameters already sorry.. */ 4242 break; 4243 } 4244 if (ptype == SCTP_STR_RESET_OUT_REQUEST) { 4245 struct sctp_stream_reset_out_request *req_out; 4246 4247 if (param_len < sizeof(struct sctp_stream_reset_out_request)) { 4248 break; 4249 } 4250 req_out = (struct sctp_stream_reset_out_request *)ph; 4251 num_req++; 4252 if (stcb->asoc.stream_reset_outstanding) { 4253 seq = ntohl(req_out->response_seq); 4254 if (seq == stcb->asoc.str_reset_seq_out) { 4255 /* implicit ack */ 4256 (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL); 4257 } 4258 } 4259 sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc); 4260 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) { 4261 struct sctp_stream_reset_add_strm *str_add; 4262 4263 if (param_len < sizeof(struct sctp_stream_reset_add_strm)) { 4264 break; 4265 } 4266 str_add = (struct sctp_stream_reset_add_strm *)ph; 4267 num_req++; 4268 sctp_handle_str_reset_add_strm(stcb, chk, str_add); 4269 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) { 4270 struct sctp_stream_reset_add_strm *str_add; 4271 4272 if (param_len < sizeof(struct sctp_stream_reset_add_strm)) { 4273 break; 4274 } 4275 str_add = (struct sctp_stream_reset_add_strm *)ph; 4276 num_req++; 4277 sctp_handle_str_reset_add_out_strm(stcb, chk, str_add); 4278 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) { 4279 struct sctp_stream_reset_in_request *req_in; 4280 4281 num_req++; 4282 req_in = (struct sctp_stream_reset_in_request *)ph; 4283 sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc); 4284 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) { 4285 struct sctp_stream_reset_tsn_request *req_tsn; 4286 4287 num_req++; 4288 req_tsn = (struct sctp_stream_reset_tsn_request *)ph; 4289 if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) { 4290 ret_code = 1; 4291 goto strres_nochunk; 4292 } 4293 /* no more */ 4294 break; 4295 } else if (ptype == SCTP_STR_RESET_RESPONSE) { 4296 struct sctp_stream_reset_response *resp; 4297 uint32_t result; 4298 4299 if (param_len < sizeof(struct sctp_stream_reset_response)) { 4300 break; 4301 } 4302 resp = (struct sctp_stream_reset_response *)ph; 4303 seq = ntohl(resp->response_seq); 4304 result = ntohl(resp->result); 4305 if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) { 4306 ret_code = 1; 4307 goto strres_nochunk; 4308 } 4309 } else { 4310 break; 4311 } 4312 offset += SCTP_SIZE32(param_len); 4313 if (remaining_length >= SCTP_SIZE32(param_len)) { 4314 remaining_length -= SCTP_SIZE32(param_len); 4315 } else { 4316 remaining_length = 0; 4317 } 4318 } 4319 if (num_req == 0) { 4320 /* we have no response free the stuff */ 4321 goto strres_nochunk; 4322 } 4323 /* ok we have a chunk to link in */ 4324 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, 4325 chk, 4326 sctp_next); 4327 stcb->asoc.ctrl_queue_cnt++; 4328 return (ret_code); 4329} 4330 4331/* 4332 * Handle a router or endpoints report of a packet loss, there are two ways 4333 * to handle this, either we get the whole packet and must disect it 4334 * ourselves (possibly with truncation and or corruption) or it is a summary 4335 * from a middle box that did the disectting for us. 4336 */ 4337static void 4338sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp, 4339 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 4340{ 4341 uint32_t bottle_bw, on_queue; 4342 uint16_t trunc_len; 4343 unsigned int chlen; 4344 unsigned int at; 4345 struct sctp_chunk_desc desc; 4346 struct sctp_chunkhdr *ch; 4347 4348 chlen = ntohs(cp->ch.chunk_length); 4349 chlen -= sizeof(struct sctp_pktdrop_chunk); 4350 /* XXX possible chlen underflow */ 4351 if (chlen == 0) { 4352 ch = NULL; 4353 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) 4354 SCTP_STAT_INCR(sctps_pdrpbwrpt); 4355 } else { 4356 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr)); 4357 chlen -= sizeof(struct sctphdr); 4358 /* XXX possible chlen underflow */ 4359 memset(&desc, 0, sizeof(desc)); 4360 } 4361 trunc_len = (uint16_t) ntohs(cp->trunc_len); 4362 if (trunc_len > limit) { 4363 trunc_len = limit; 4364 } 4365 /* now the chunks themselves */ 4366 while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) { 4367 desc.chunk_type = ch->chunk_type; 4368 /* get amount we need to move */ 4369 at = ntohs(ch->chunk_length); 4370 if (at < sizeof(struct sctp_chunkhdr)) { 4371 /* corrupt chunk, maybe at the end? */ 4372 SCTP_STAT_INCR(sctps_pdrpcrupt); 4373 break; 4374 } 4375 if (trunc_len == 0) { 4376 /* we are supposed to have all of it */ 4377 if (at > chlen) { 4378 /* corrupt skip it */ 4379 SCTP_STAT_INCR(sctps_pdrpcrupt); 4380 break; 4381 } 4382 } else { 4383 /* is there enough of it left ? */ 4384 if (desc.chunk_type == SCTP_DATA) { 4385 if (chlen < (sizeof(struct sctp_data_chunk) + 4386 sizeof(desc.data_bytes))) { 4387 break; 4388 } 4389 } else { 4390 if (chlen < sizeof(struct sctp_chunkhdr)) { 4391 break; 4392 } 4393 } 4394 } 4395 if (desc.chunk_type == SCTP_DATA) { 4396 /* can we get out the tsn? */ 4397 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4398 SCTP_STAT_INCR(sctps_pdrpmbda); 4399 4400 if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) { 4401 /* yep */ 4402 struct sctp_data_chunk *dcp; 4403 uint8_t *ddp; 4404 unsigned int iii; 4405 4406 dcp = (struct sctp_data_chunk *)ch; 4407 ddp = (uint8_t *) (dcp + 1); 4408 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) { 4409 desc.data_bytes[iii] = ddp[iii]; 4410 } 4411 desc.tsn_ifany = dcp->dp.tsn; 4412 } else { 4413 /* nope we are done. */ 4414 SCTP_STAT_INCR(sctps_pdrpnedat); 4415 break; 4416 } 4417 } else { 4418 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4419 SCTP_STAT_INCR(sctps_pdrpmbct); 4420 } 4421 4422 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) { 4423 SCTP_STAT_INCR(sctps_pdrppdbrk); 4424 break; 4425 } 4426 if (SCTP_SIZE32(at) > chlen) { 4427 break; 4428 } 4429 chlen -= SCTP_SIZE32(at); 4430 if (chlen < sizeof(struct sctp_chunkhdr)) { 4431 /* done, none left */ 4432 break; 4433 } 4434 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at)); 4435 } 4436 /* Now update any rwnd --- possibly */ 4437 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) { 4438 /* From a peer, we get a rwnd report */ 4439 uint32_t a_rwnd; 4440 4441 SCTP_STAT_INCR(sctps_pdrpfehos); 4442 4443 bottle_bw = ntohl(cp->bottle_bw); 4444 on_queue = ntohl(cp->current_onq); 4445 if (bottle_bw && on_queue) { 4446 /* a rwnd report is in here */ 4447 if (bottle_bw > on_queue) 4448 a_rwnd = bottle_bw - on_queue; 4449 else 4450 a_rwnd = 0; 4451 4452 if (a_rwnd == 0) 4453 stcb->asoc.peers_rwnd = 0; 4454 else { 4455 if (a_rwnd > stcb->asoc.total_flight) { 4456 stcb->asoc.peers_rwnd = 4457 a_rwnd - stcb->asoc.total_flight; 4458 } else { 4459 stcb->asoc.peers_rwnd = 0; 4460 } 4461 if (stcb->asoc.peers_rwnd < 4462 stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 4463 /* SWS sender side engages */ 4464 stcb->asoc.peers_rwnd = 0; 4465 } 4466 } 4467 } 4468 } else { 4469 SCTP_STAT_INCR(sctps_pdrpfmbox); 4470 } 4471 4472 /* now middle boxes in sat networks get a cwnd bump */ 4473 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) && 4474 (stcb->asoc.sat_t3_loss_recovery == 0) && 4475 (stcb->asoc.sat_network)) { 4476 /* 4477 * This is debateable but for sat networks it makes sense 4478 * Note if a T3 timer has went off, we will prohibit any 4479 * changes to cwnd until we exit the t3 loss recovery. 4480 */ 4481 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb, 4482 net, cp, &bottle_bw, &on_queue); 4483 } 4484} 4485 4486/* 4487 * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to 4488 * still contain IP/SCTP header - stcb: is the tcb found for this packet - 4489 * offset: offset into the mbuf chain to first chunkhdr - length: is the 4490 * length of the complete packet outputs: - length: modified to remaining 4491 * length after control processing - netp: modified to new sctp_nets after 4492 * cookie-echo processing - return NULL to discard the packet (ie. no asoc, 4493 * bad packet,...) otherwise return the tcb for this packet 4494 */ 4495#ifdef __GNUC__ 4496__attribute__((noinline)) 4497#endif 4498 static struct sctp_tcb * 4499 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length, 4500 struct sockaddr *src, struct sockaddr *dst, 4501 struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp, 4502 struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen, 4503 uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum, 4504 uint32_t vrf_id, uint16_t port) 4505{ 4506 struct sctp_association *asoc; 4507 struct mbuf *op_err; 4508 char msg[SCTP_DIAG_INFO_LEN]; 4509 uint32_t vtag_in; 4510 int num_chunks = 0; /* number of control chunks processed */ 4511 uint32_t chk_length; 4512 int ret; 4513 int abort_no_unlock = 0; 4514 int ecne_seen = 0; 4515 4516 /* 4517 * How big should this be, and should it be alloc'd? Lets try the 4518 * d-mtu-ceiling for now (2k) and that should hopefully work ... 4519 * until we get into jumbo grams and such.. 4520 */ 4521 uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE]; 4522 struct sctp_tcb *locked_tcb = stcb; 4523 int got_auth = 0; 4524 uint32_t auth_offset = 0, auth_len = 0; 4525 int auth_skipped = 0; 4526 int asconf_cnt = 0; 4527 4528#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4529 struct socket *so; 4530 4531#endif 4532 4533 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n", 4534 iphlen, *offset, length, (void *)stcb); 4535 4536 /* validate chunk header length... */ 4537 if (ntohs(ch->chunk_length) < sizeof(*ch)) { 4538 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n", 4539 ntohs(ch->chunk_length)); 4540 if (locked_tcb) { 4541 SCTP_TCB_UNLOCK(locked_tcb); 4542 } 4543 return (NULL); 4544 } 4545 /* 4546 * validate the verification tag 4547 */ 4548 vtag_in = ntohl(sh->v_tag); 4549 4550 if (locked_tcb) { 4551 SCTP_TCB_LOCK_ASSERT(locked_tcb); 4552 } 4553 if (ch->chunk_type == SCTP_INITIATION) { 4554 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n", 4555 ntohs(ch->chunk_length), vtag_in); 4556 if (vtag_in != 0) { 4557 /* protocol error- silently discard... */ 4558 SCTP_STAT_INCR(sctps_badvtag); 4559 if (locked_tcb) { 4560 SCTP_TCB_UNLOCK(locked_tcb); 4561 } 4562 return (NULL); 4563 } 4564 } else if (ch->chunk_type != SCTP_COOKIE_ECHO) { 4565 /* 4566 * If there is no stcb, skip the AUTH chunk and process 4567 * later after a stcb is found (to validate the lookup was 4568 * valid. 4569 */ 4570 if ((ch->chunk_type == SCTP_AUTHENTICATION) && 4571 (stcb == NULL) && 4572 (inp->auth_supported == 1)) { 4573 /* save this chunk for later processing */ 4574 auth_skipped = 1; 4575 auth_offset = *offset; 4576 auth_len = ntohs(ch->chunk_length); 4577 4578 /* (temporarily) move past this chunk */ 4579 *offset += SCTP_SIZE32(auth_len); 4580 if (*offset >= length) { 4581 /* no more data left in the mbuf chain */ 4582 *offset = length; 4583 if (locked_tcb) { 4584 SCTP_TCB_UNLOCK(locked_tcb); 4585 } 4586 return (NULL); 4587 } 4588 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4589 sizeof(struct sctp_chunkhdr), chunk_buf); 4590 } 4591 if (ch == NULL) { 4592 /* Help */ 4593 *offset = length; 4594 if (locked_tcb) { 4595 SCTP_TCB_UNLOCK(locked_tcb); 4596 } 4597 return (NULL); 4598 } 4599 if (ch->chunk_type == SCTP_COOKIE_ECHO) { 4600 goto process_control_chunks; 4601 } 4602 /* 4603 * first check if it's an ASCONF with an unknown src addr we 4604 * need to look inside to find the association 4605 */ 4606 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) { 4607 struct sctp_chunkhdr *asconf_ch = ch; 4608 uint32_t asconf_offset = 0, asconf_len = 0; 4609 4610 /* inp's refcount may be reduced */ 4611 SCTP_INP_INCR_REF(inp); 4612 4613 asconf_offset = *offset; 4614 do { 4615 asconf_len = ntohs(asconf_ch->chunk_length); 4616 if (asconf_len < sizeof(struct sctp_asconf_paramhdr)) 4617 break; 4618 stcb = sctp_findassociation_ep_asconf(m, 4619 *offset, 4620 dst, 4621 sh, &inp, netp, vrf_id); 4622 if (stcb != NULL) 4623 break; 4624 asconf_offset += SCTP_SIZE32(asconf_len); 4625 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset, 4626 sizeof(struct sctp_chunkhdr), chunk_buf); 4627 } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF); 4628 if (stcb == NULL) { 4629 /* 4630 * reduce inp's refcount if not reduced in 4631 * sctp_findassociation_ep_asconf(). 4632 */ 4633 SCTP_INP_DECR_REF(inp); 4634 } else { 4635 locked_tcb = stcb; 4636 } 4637 4638 /* now go back and verify any auth chunk to be sure */ 4639 if (auth_skipped && (stcb != NULL)) { 4640 struct sctp_auth_chunk *auth; 4641 4642 auth = (struct sctp_auth_chunk *) 4643 sctp_m_getptr(m, auth_offset, 4644 auth_len, chunk_buf); 4645 got_auth = 1; 4646 auth_skipped = 0; 4647 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, 4648 auth_offset)) { 4649 /* auth HMAC failed so dump it */ 4650 *offset = length; 4651 if (locked_tcb) { 4652 SCTP_TCB_UNLOCK(locked_tcb); 4653 } 4654 return (NULL); 4655 } else { 4656 /* remaining chunks are HMAC checked */ 4657 stcb->asoc.authenticated = 1; 4658 } 4659 } 4660 } 4661 if (stcb == NULL) { 4662 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 4663 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4664 msg); 4665 /* no association, so it's out of the blue... */ 4666 sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, op_err, 4667 mflowtype, mflowid, inp->fibnum, 4668 vrf_id, port); 4669 *offset = length; 4670 if (locked_tcb) { 4671 SCTP_TCB_UNLOCK(locked_tcb); 4672 } 4673 return (NULL); 4674 } 4675 asoc = &stcb->asoc; 4676 /* ABORT and SHUTDOWN can use either v_tag... */ 4677 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) || 4678 (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) || 4679 (ch->chunk_type == SCTP_PACKET_DROPPED)) { 4680 /* Take the T-bit always into account. */ 4681 if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) && 4682 (vtag_in == asoc->my_vtag)) || 4683 (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) && 4684 (vtag_in == asoc->peer_vtag))) { 4685 /* this is valid */ 4686 } else { 4687 /* drop this packet... */ 4688 SCTP_STAT_INCR(sctps_badvtag); 4689 if (locked_tcb) { 4690 SCTP_TCB_UNLOCK(locked_tcb); 4691 } 4692 return (NULL); 4693 } 4694 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 4695 if (vtag_in != asoc->my_vtag) { 4696 /* 4697 * this could be a stale SHUTDOWN-ACK or the 4698 * peer never got the SHUTDOWN-COMPLETE and 4699 * is still hung; we have started a new asoc 4700 * but it won't complete until the shutdown 4701 * is completed 4702 */ 4703 if (locked_tcb) { 4704 SCTP_TCB_UNLOCK(locked_tcb); 4705 } 4706 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 4707 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4708 msg); 4709 sctp_handle_ootb(m, iphlen, *offset, src, dst, 4710 sh, inp, op_err, 4711 mflowtype, mflowid, fibnum, 4712 vrf_id, port); 4713 return (NULL); 4714 } 4715 } else { 4716 /* for all other chunks, vtag must match */ 4717 if (vtag_in != asoc->my_vtag) { 4718 /* invalid vtag... */ 4719 SCTPDBG(SCTP_DEBUG_INPUT3, 4720 "invalid vtag: %xh, expect %xh\n", 4721 vtag_in, asoc->my_vtag); 4722 SCTP_STAT_INCR(sctps_badvtag); 4723 if (locked_tcb) { 4724 SCTP_TCB_UNLOCK(locked_tcb); 4725 } 4726 *offset = length; 4727 return (NULL); 4728 } 4729 } 4730 } /* end if !SCTP_COOKIE_ECHO */ 4731 /* 4732 * process all control chunks... 4733 */ 4734 if (((ch->chunk_type == SCTP_SELECTIVE_ACK) || 4735 (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) || 4736 (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) && 4737 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) { 4738 /* implied cookie-ack.. we must have lost the ack */ 4739 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4740 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4741 stcb->asoc.overall_error_count, 4742 0, 4743 SCTP_FROM_SCTP_INPUT, 4744 __LINE__); 4745 } 4746 stcb->asoc.overall_error_count = 0; 4747 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, 4748 *netp); 4749 } 4750process_control_chunks: 4751 while (IS_SCTP_CONTROL(ch)) { 4752 /* validate chunk length */ 4753 chk_length = ntohs(ch->chunk_length); 4754 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n", 4755 ch->chunk_type, chk_length); 4756 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length); 4757 if (chk_length < sizeof(*ch) || 4758 (*offset + (int)chk_length) > length) { 4759 *offset = length; 4760 if (locked_tcb) { 4761 SCTP_TCB_UNLOCK(locked_tcb); 4762 } 4763 return (NULL); 4764 } 4765 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks); 4766 /* 4767 * INIT-ACK only gets the init ack "header" portion only 4768 * because we don't have to process the peer's COOKIE. All 4769 * others get a complete chunk. 4770 */ 4771 if ((ch->chunk_type == SCTP_INITIATION_ACK) || 4772 (ch->chunk_type == SCTP_INITIATION)) { 4773 /* get an init-ack chunk */ 4774 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4775 sizeof(struct sctp_init_ack_chunk), chunk_buf); 4776 if (ch == NULL) { 4777 *offset = length; 4778 if (locked_tcb) { 4779 SCTP_TCB_UNLOCK(locked_tcb); 4780 } 4781 return (NULL); 4782 } 4783 } else { 4784 /* For cookies and all other chunks. */ 4785 if (chk_length > sizeof(chunk_buf)) { 4786 /* 4787 * use just the size of the chunk buffer so 4788 * the front part of our chunks fit in 4789 * contiguous space up to the chunk buffer 4790 * size (508 bytes). For chunks that need to 4791 * get more than that they must use the 4792 * sctp_m_getptr() function or other means 4793 * (e.g. know how to parse mbuf chains). 4794 * Cookies do this already. 4795 */ 4796 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4797 (sizeof(chunk_buf) - 4), 4798 chunk_buf); 4799 if (ch == NULL) { 4800 *offset = length; 4801 if (locked_tcb) { 4802 SCTP_TCB_UNLOCK(locked_tcb); 4803 } 4804 return (NULL); 4805 } 4806 } else { 4807 /* We can fit it all */ 4808 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4809 chk_length, chunk_buf); 4810 if (ch == NULL) { 4811 SCTP_PRINTF("sctp_process_control: Can't get the all data....\n"); 4812 *offset = length; 4813 if (locked_tcb) { 4814 SCTP_TCB_UNLOCK(locked_tcb); 4815 } 4816 return (NULL); 4817 } 4818 } 4819 } 4820 num_chunks++; 4821 /* Save off the last place we got a control from */ 4822 if (stcb != NULL) { 4823 if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) { 4824 /* 4825 * allow last_control to be NULL if 4826 * ASCONF... ASCONF processing will find the 4827 * right net later 4828 */ 4829 if ((netp != NULL) && (*netp != NULL)) 4830 stcb->asoc.last_control_chunk_from = *netp; 4831 } 4832 } 4833#ifdef SCTP_AUDITING_ENABLED 4834 sctp_audit_log(0xB0, ch->chunk_type); 4835#endif 4836 4837 /* check to see if this chunk required auth, but isn't */ 4838 if ((stcb != NULL) && 4839 (stcb->asoc.auth_supported == 1) && 4840 sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) && 4841 !stcb->asoc.authenticated) { 4842 /* "silently" ignore */ 4843 SCTP_STAT_INCR(sctps_recvauthmissing); 4844 goto next_chunk; 4845 } 4846 switch (ch->chunk_type) { 4847 case SCTP_INITIATION: 4848 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n"); 4849 /* The INIT chunk must be the only chunk. */ 4850 if ((num_chunks > 1) || 4851 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4852 /* RFC 4960 requires that no ABORT is sent */ 4853 *offset = length; 4854 if (locked_tcb) { 4855 SCTP_TCB_UNLOCK(locked_tcb); 4856 } 4857 return (NULL); 4858 } 4859 /* Honor our resource limit. */ 4860 if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) { 4861 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 4862 sctp_abort_association(inp, stcb, m, iphlen, 4863 src, dst, sh, op_err, 4864 mflowtype, mflowid, 4865 vrf_id, port); 4866 *offset = length; 4867 return (NULL); 4868 } 4869 sctp_handle_init(m, iphlen, *offset, src, dst, sh, 4870 (struct sctp_init_chunk *)ch, inp, 4871 stcb, *netp, &abort_no_unlock, 4872 mflowtype, mflowid, 4873 vrf_id, port); 4874 *offset = length; 4875 if ((!abort_no_unlock) && (locked_tcb)) { 4876 SCTP_TCB_UNLOCK(locked_tcb); 4877 } 4878 return (NULL); 4879 break; 4880 case SCTP_PAD_CHUNK: 4881 break; 4882 case SCTP_INITIATION_ACK: 4883 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT-ACK\n"); 4884 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4885 /* We are not interested anymore */ 4886 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4887 ; 4888 } else { 4889 if ((locked_tcb != NULL) && (locked_tcb != stcb)) { 4890 /* Very unlikely */ 4891 SCTP_TCB_UNLOCK(locked_tcb); 4892 } 4893 *offset = length; 4894 if (stcb) { 4895#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4896 so = SCTP_INP_SO(inp); 4897 atomic_add_int(&stcb->asoc.refcnt, 1); 4898 SCTP_TCB_UNLOCK(stcb); 4899 SCTP_SOCKET_LOCK(so, 1); 4900 SCTP_TCB_LOCK(stcb); 4901 atomic_subtract_int(&stcb->asoc.refcnt, 1); 4902#endif 4903 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 4904 SCTP_FROM_SCTP_INPUT + SCTP_LOC_29); 4905#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4906 SCTP_SOCKET_UNLOCK(so, 1); 4907#endif 4908 } 4909 return (NULL); 4910 } 4911 } 4912 /* The INIT-ACK chunk must be the only chunk. */ 4913 if ((num_chunks > 1) || 4914 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4915 *offset = length; 4916 if (locked_tcb) { 4917 SCTP_TCB_UNLOCK(locked_tcb); 4918 } 4919 return (NULL); 4920 } 4921 if ((netp) && (*netp)) { 4922 ret = sctp_handle_init_ack(m, iphlen, *offset, 4923 src, dst, sh, 4924 (struct sctp_init_ack_chunk *)ch, 4925 stcb, *netp, 4926 &abort_no_unlock, 4927 mflowtype, mflowid, 4928 vrf_id); 4929 } else { 4930 ret = -1; 4931 } 4932 *offset = length; 4933 if (abort_no_unlock) { 4934 return (NULL); 4935 } 4936 /* 4937 * Special case, I must call the output routine to 4938 * get the cookie echoed 4939 */ 4940 if ((stcb != NULL) && (ret == 0)) { 4941 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 4942 } 4943 if (locked_tcb) { 4944 SCTP_TCB_UNLOCK(locked_tcb); 4945 } 4946 return (NULL); 4947 break; 4948 case SCTP_SELECTIVE_ACK: 4949 { 4950 struct sctp_sack_chunk *sack; 4951 int abort_now = 0; 4952 uint32_t a_rwnd, cum_ack; 4953 uint16_t num_seg, num_dup; 4954 uint8_t flags; 4955 int offset_seg, offset_dup; 4956 4957 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK\n"); 4958 SCTP_STAT_INCR(sctps_recvsacks); 4959 if (stcb == NULL) { 4960 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing SACK chunk\n"); 4961 break; 4962 } 4963 if (chk_length < sizeof(struct sctp_sack_chunk)) { 4964 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n"); 4965 break; 4966 } 4967 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4968 /*- 4969 * If we have sent a shutdown-ack, we will pay no 4970 * attention to a sack sent in to us since 4971 * we don't care anymore. 4972 */ 4973 break; 4974 } 4975 sack = (struct sctp_sack_chunk *)ch; 4976 flags = ch->chunk_flags; 4977 cum_ack = ntohl(sack->sack.cum_tsn_ack); 4978 num_seg = ntohs(sack->sack.num_gap_ack_blks); 4979 num_dup = ntohs(sack->sack.num_dup_tsns); 4980 a_rwnd = (uint32_t) ntohl(sack->sack.a_rwnd); 4981 if (sizeof(struct sctp_sack_chunk) + 4982 num_seg * sizeof(struct sctp_gap_ack_block) + 4983 num_dup * sizeof(uint32_t) != chk_length) { 4984 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n"); 4985 break; 4986 } 4987 offset_seg = *offset + sizeof(struct sctp_sack_chunk); 4988 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 4989 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n", 4990 cum_ack, num_seg, a_rwnd); 4991 stcb->asoc.seen_a_sack_this_pkt = 1; 4992 if ((stcb->asoc.pr_sctp_cnt == 0) && 4993 (num_seg == 0) && 4994 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 4995 (stcb->asoc.saw_sack_with_frags == 0) && 4996 (stcb->asoc.saw_sack_with_nr_frags == 0) && 4997 (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) 4998 ) { 4999 /* 5000 * We have a SIMPLE sack having no 5001 * prior segments and data on sent 5002 * queue to be acked.. Use the 5003 * faster path sack processing. We 5004 * also allow window update sacks 5005 * with no missing segments to go 5006 * this way too. 5007 */ 5008 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, &abort_now, ecne_seen); 5009 } else { 5010 if (netp && *netp) 5011 sctp_handle_sack(m, offset_seg, offset_dup, stcb, 5012 num_seg, 0, num_dup, &abort_now, flags, 5013 cum_ack, a_rwnd, ecne_seen); 5014 } 5015 if (abort_now) { 5016 /* ABORT signal from sack processing */ 5017 *offset = length; 5018 return (NULL); 5019 } 5020 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 5021 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 5022 (stcb->asoc.stream_queue_cnt == 0)) { 5023 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 5024 } 5025 } 5026 break; 5027 /* 5028 * EY - nr_sack: If the received chunk is an 5029 * nr_sack chunk 5030 */ 5031 case SCTP_NR_SELECTIVE_ACK: 5032 { 5033 struct sctp_nr_sack_chunk *nr_sack; 5034 int abort_now = 0; 5035 uint32_t a_rwnd, cum_ack; 5036 uint16_t num_seg, num_nr_seg, num_dup; 5037 uint8_t flags; 5038 int offset_seg, offset_dup; 5039 5040 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK\n"); 5041 SCTP_STAT_INCR(sctps_recvsacks); 5042 if (stcb == NULL) { 5043 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing NR-SACK chunk\n"); 5044 break; 5045 } 5046 if (stcb->asoc.nrsack_supported == 0) { 5047 goto unknown_chunk; 5048 } 5049 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) { 5050 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR-SACK chunk, too small\n"); 5051 break; 5052 } 5053 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 5054 /*- 5055 * If we have sent a shutdown-ack, we will pay no 5056 * attention to a sack sent in to us since 5057 * we don't care anymore. 5058 */ 5059 break; 5060 } 5061 nr_sack = (struct sctp_nr_sack_chunk *)ch; 5062 flags = ch->chunk_flags; 5063 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack); 5064 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks); 5065 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks); 5066 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns); 5067 a_rwnd = (uint32_t) ntohl(nr_sack->nr_sack.a_rwnd); 5068 if (sizeof(struct sctp_nr_sack_chunk) + 5069 (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) + 5070 num_dup * sizeof(uint32_t) != chk_length) { 5071 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n"); 5072 break; 5073 } 5074 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk); 5075 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 5076 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n", 5077 cum_ack, num_seg, a_rwnd); 5078 stcb->asoc.seen_a_sack_this_pkt = 1; 5079 if ((stcb->asoc.pr_sctp_cnt == 0) && 5080 (num_seg == 0) && (num_nr_seg == 0) && 5081 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 5082 (stcb->asoc.saw_sack_with_frags == 0) && 5083 (stcb->asoc.saw_sack_with_nr_frags == 0) && 5084 (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) { 5085 /* 5086 * We have a SIMPLE sack having no 5087 * prior segments and data on sent 5088 * queue to be acked. Use the faster 5089 * path sack processing. We also 5090 * allow window update sacks with no 5091 * missing segments to go this way 5092 * too. 5093 */ 5094 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, 5095 &abort_now, ecne_seen); 5096 } else { 5097 if (netp && *netp) 5098 sctp_handle_sack(m, offset_seg, offset_dup, stcb, 5099 num_seg, num_nr_seg, num_dup, &abort_now, flags, 5100 cum_ack, a_rwnd, ecne_seen); 5101 } 5102 if (abort_now) { 5103 /* ABORT signal from sack processing */ 5104 *offset = length; 5105 return (NULL); 5106 } 5107 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 5108 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 5109 (stcb->asoc.stream_queue_cnt == 0)) { 5110 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 5111 } 5112 } 5113 break; 5114 5115 case SCTP_HEARTBEAT_REQUEST: 5116 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n"); 5117 if ((stcb) && netp && *netp) { 5118 SCTP_STAT_INCR(sctps_recvheartbeat); 5119 sctp_send_heartbeat_ack(stcb, m, *offset, 5120 chk_length, *netp); 5121 5122 /* He's alive so give him credit */ 5123 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5124 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5125 stcb->asoc.overall_error_count, 5126 0, 5127 SCTP_FROM_SCTP_INPUT, 5128 __LINE__); 5129 } 5130 stcb->asoc.overall_error_count = 0; 5131 } 5132 break; 5133 case SCTP_HEARTBEAT_ACK: 5134 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT-ACK\n"); 5135 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) { 5136 /* Its not ours */ 5137 *offset = length; 5138 if (locked_tcb) { 5139 SCTP_TCB_UNLOCK(locked_tcb); 5140 } 5141 return (NULL); 5142 } 5143 /* He's alive so give him credit */ 5144 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5145 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5146 stcb->asoc.overall_error_count, 5147 0, 5148 SCTP_FROM_SCTP_INPUT, 5149 __LINE__); 5150 } 5151 stcb->asoc.overall_error_count = 0; 5152 SCTP_STAT_INCR(sctps_recvheartbeatack); 5153 if (netp && *netp) 5154 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch, 5155 stcb, *netp); 5156 break; 5157 case SCTP_ABORT_ASSOCIATION: 5158 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n", 5159 (void *)stcb); 5160 if ((stcb) && netp && *netp) 5161 sctp_handle_abort((struct sctp_abort_chunk *)ch, 5162 stcb, *netp); 5163 *offset = length; 5164 return (NULL); 5165 break; 5166 case SCTP_SHUTDOWN: 5167 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n", 5168 (void *)stcb); 5169 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) { 5170 *offset = length; 5171 if (locked_tcb) { 5172 SCTP_TCB_UNLOCK(locked_tcb); 5173 } 5174 return (NULL); 5175 } 5176 if (netp && *netp) { 5177 int abort_flag = 0; 5178 5179 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch, 5180 stcb, *netp, &abort_flag); 5181 if (abort_flag) { 5182 *offset = length; 5183 return (NULL); 5184 } 5185 } 5186 break; 5187 case SCTP_SHUTDOWN_ACK: 5188 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-ACK, stcb %p\n", (void *)stcb); 5189 if ((stcb) && (netp) && (*netp)) 5190 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp); 5191 *offset = length; 5192 return (NULL); 5193 break; 5194 5195 case SCTP_OPERATION_ERROR: 5196 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP-ERR\n"); 5197 if ((stcb) && netp && *netp && sctp_handle_error(ch, stcb, *netp) < 0) { 5198 *offset = length; 5199 return (NULL); 5200 } 5201 break; 5202 case SCTP_COOKIE_ECHO: 5203 SCTPDBG(SCTP_DEBUG_INPUT3, 5204 "SCTP_COOKIE-ECHO, stcb %p\n", (void *)stcb); 5205 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 5206 ; 5207 } else { 5208 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5209 /* We are not interested anymore */ 5210 abend: 5211 if (stcb) { 5212 SCTP_TCB_UNLOCK(stcb); 5213 } 5214 *offset = length; 5215 return (NULL); 5216 } 5217 } 5218 /* 5219 * First are we accepting? We do this again here 5220 * since it is possible that a previous endpoint WAS 5221 * listening responded to a INIT-ACK and then 5222 * closed. We opened and bound.. and are now no 5223 * longer listening. 5224 */ 5225 5226 if ((stcb == NULL) && (inp->sctp_socket->so_qlen >= inp->sctp_socket->so_qlimit)) { 5227 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 5228 (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) { 5229 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 5230 sctp_abort_association(inp, stcb, m, iphlen, 5231 src, dst, sh, op_err, 5232 mflowtype, mflowid, 5233 vrf_id, port); 5234 } 5235 *offset = length; 5236 return (NULL); 5237 } else { 5238 struct mbuf *ret_buf; 5239 struct sctp_inpcb *linp; 5240 5241 if (stcb) { 5242 linp = NULL; 5243 } else { 5244 linp = inp; 5245 } 5246 5247 if (linp) { 5248 SCTP_ASOC_CREATE_LOCK(linp); 5249 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 5250 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) { 5251 SCTP_ASOC_CREATE_UNLOCK(linp); 5252 goto abend; 5253 } 5254 } 5255 if (netp) { 5256 ret_buf = 5257 sctp_handle_cookie_echo(m, iphlen, 5258 *offset, 5259 src, dst, 5260 sh, 5261 (struct sctp_cookie_echo_chunk *)ch, 5262 &inp, &stcb, netp, 5263 auth_skipped, 5264 auth_offset, 5265 auth_len, 5266 &locked_tcb, 5267 mflowtype, 5268 mflowid, 5269 vrf_id, 5270 port); 5271 } else { 5272 ret_buf = NULL; 5273 } 5274 if (linp) { 5275 SCTP_ASOC_CREATE_UNLOCK(linp); 5276 } 5277 if (ret_buf == NULL) { 5278 if (locked_tcb) { 5279 SCTP_TCB_UNLOCK(locked_tcb); 5280 } 5281 SCTPDBG(SCTP_DEBUG_INPUT3, 5282 "GAK, null buffer\n"); 5283 *offset = length; 5284 return (NULL); 5285 } 5286 /* if AUTH skipped, see if it verified... */ 5287 if (auth_skipped) { 5288 got_auth = 1; 5289 auth_skipped = 0; 5290 } 5291 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) { 5292 /* 5293 * Restart the timer if we have 5294 * pending data 5295 */ 5296 struct sctp_tmit_chunk *chk; 5297 5298 chk = TAILQ_FIRST(&stcb->asoc.sent_queue); 5299 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 5300 } 5301 } 5302 break; 5303 case SCTP_COOKIE_ACK: 5304 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE-ACK, stcb %p\n", (void *)stcb); 5305 if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) { 5306 if (locked_tcb) { 5307 SCTP_TCB_UNLOCK(locked_tcb); 5308 } 5309 return (NULL); 5310 } 5311 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5312 /* We are not interested anymore */ 5313 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 5314 ; 5315 } else if (stcb) { 5316#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5317 so = SCTP_INP_SO(inp); 5318 atomic_add_int(&stcb->asoc.refcnt, 1); 5319 SCTP_TCB_UNLOCK(stcb); 5320 SCTP_SOCKET_LOCK(so, 1); 5321 SCTP_TCB_LOCK(stcb); 5322 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5323#endif 5324 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 5325 SCTP_FROM_SCTP_INPUT + SCTP_LOC_30); 5326#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5327 SCTP_SOCKET_UNLOCK(so, 1); 5328#endif 5329 *offset = length; 5330 return (NULL); 5331 } 5332 } 5333 /* He's alive so give him credit */ 5334 if ((stcb) && netp && *netp) { 5335 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5336 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5337 stcb->asoc.overall_error_count, 5338 0, 5339 SCTP_FROM_SCTP_INPUT, 5340 __LINE__); 5341 } 5342 stcb->asoc.overall_error_count = 0; 5343 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp); 5344 } 5345 break; 5346 case SCTP_ECN_ECHO: 5347 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-ECHO\n"); 5348 /* He's alive so give him credit */ 5349 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) { 5350 /* Its not ours */ 5351 if (locked_tcb) { 5352 SCTP_TCB_UNLOCK(locked_tcb); 5353 } 5354 *offset = length; 5355 return (NULL); 5356 } 5357 if (stcb) { 5358 if (stcb->asoc.ecn_supported == 0) { 5359 goto unknown_chunk; 5360 } 5361 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5362 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5363 stcb->asoc.overall_error_count, 5364 0, 5365 SCTP_FROM_SCTP_INPUT, 5366 __LINE__); 5367 } 5368 stcb->asoc.overall_error_count = 0; 5369 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, 5370 stcb); 5371 ecne_seen = 1; 5372 } 5373 break; 5374 case SCTP_ECN_CWR: 5375 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-CWR\n"); 5376 /* He's alive so give him credit */ 5377 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) { 5378 /* Its not ours */ 5379 if (locked_tcb) { 5380 SCTP_TCB_UNLOCK(locked_tcb); 5381 } 5382 *offset = length; 5383 return (NULL); 5384 } 5385 if (stcb) { 5386 if (stcb->asoc.ecn_supported == 0) { 5387 goto unknown_chunk; 5388 } 5389 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5390 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5391 stcb->asoc.overall_error_count, 5392 0, 5393 SCTP_FROM_SCTP_INPUT, 5394 __LINE__); 5395 } 5396 stcb->asoc.overall_error_count = 0; 5397 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp); 5398 } 5399 break; 5400 case SCTP_SHUTDOWN_COMPLETE: 5401 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-COMPLETE, stcb %p\n", (void *)stcb); 5402 /* must be first and only chunk */ 5403 if ((num_chunks > 1) || 5404 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 5405 *offset = length; 5406 if (locked_tcb) { 5407 SCTP_TCB_UNLOCK(locked_tcb); 5408 } 5409 return (NULL); 5410 } 5411 if ((stcb) && netp && *netp) { 5412 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch, 5413 stcb, *netp); 5414 } 5415 *offset = length; 5416 return (NULL); 5417 break; 5418 case SCTP_ASCONF: 5419 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n"); 5420 /* He's alive so give him credit */ 5421 if (stcb) { 5422 if (stcb->asoc.asconf_supported == 0) { 5423 goto unknown_chunk; 5424 } 5425 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5426 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5427 stcb->asoc.overall_error_count, 5428 0, 5429 SCTP_FROM_SCTP_INPUT, 5430 __LINE__); 5431 } 5432 stcb->asoc.overall_error_count = 0; 5433 sctp_handle_asconf(m, *offset, src, 5434 (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0); 5435 asconf_cnt++; 5436 } 5437 break; 5438 case SCTP_ASCONF_ACK: 5439 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF-ACK\n"); 5440 if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) { 5441 /* Its not ours */ 5442 if (locked_tcb) { 5443 SCTP_TCB_UNLOCK(locked_tcb); 5444 } 5445 *offset = length; 5446 return (NULL); 5447 } 5448 if ((stcb) && netp && *netp) { 5449 if (stcb->asoc.asconf_supported == 0) { 5450 goto unknown_chunk; 5451 } 5452 /* He's alive so give him credit */ 5453 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5454 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5455 stcb->asoc.overall_error_count, 5456 0, 5457 SCTP_FROM_SCTP_INPUT, 5458 __LINE__); 5459 } 5460 stcb->asoc.overall_error_count = 0; 5461 sctp_handle_asconf_ack(m, *offset, 5462 (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock); 5463 if (abort_no_unlock) 5464 return (NULL); 5465 } 5466 break; 5467 case SCTP_FORWARD_CUM_TSN: 5468 case SCTP_IFORWARD_CUM_TSN: 5469 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD-TSN\n"); 5470 if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) { 5471 /* Its not ours */ 5472 if (locked_tcb) { 5473 SCTP_TCB_UNLOCK(locked_tcb); 5474 } 5475 *offset = length; 5476 return (NULL); 5477 } 5478 /* He's alive so give him credit */ 5479 if (stcb) { 5480 int abort_flag = 0; 5481 5482 if (stcb->asoc.prsctp_supported == 0) { 5483 goto unknown_chunk; 5484 } 5485 stcb->asoc.overall_error_count = 0; 5486 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5487 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5488 stcb->asoc.overall_error_count, 5489 0, 5490 SCTP_FROM_SCTP_INPUT, 5491 __LINE__); 5492 } 5493 *fwd_tsn_seen = 1; 5494 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5495 /* We are not interested anymore */ 5496#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5497 so = SCTP_INP_SO(inp); 5498 atomic_add_int(&stcb->asoc.refcnt, 1); 5499 SCTP_TCB_UNLOCK(stcb); 5500 SCTP_SOCKET_LOCK(so, 1); 5501 SCTP_TCB_LOCK(stcb); 5502 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5503#endif 5504 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 5505 SCTP_FROM_SCTP_INPUT + SCTP_LOC_31); 5506#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5507 SCTP_SOCKET_UNLOCK(so, 1); 5508#endif 5509 *offset = length; 5510 return (NULL); 5511 } 5512 sctp_handle_forward_tsn(stcb, 5513 (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset); 5514 if (abort_flag) { 5515 *offset = length; 5516 return (NULL); 5517 } else { 5518 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5519 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5520 stcb->asoc.overall_error_count, 5521 0, 5522 SCTP_FROM_SCTP_INPUT, 5523 __LINE__); 5524 } 5525 stcb->asoc.overall_error_count = 0; 5526 } 5527 5528 } 5529 break; 5530 case SCTP_STREAM_RESET: 5531 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n"); 5532 if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) { 5533 /* Its not ours */ 5534 if (locked_tcb) { 5535 SCTP_TCB_UNLOCK(locked_tcb); 5536 } 5537 *offset = length; 5538 return (NULL); 5539 } 5540 if (stcb->asoc.reconfig_supported == 0) { 5541 goto unknown_chunk; 5542 } 5543 if (sctp_handle_stream_reset(stcb, m, *offset, ch)) { 5544 /* stop processing */ 5545 *offset = length; 5546 return (NULL); 5547 } 5548 break; 5549 case SCTP_PACKET_DROPPED: 5550 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n"); 5551 /* re-get it all please */ 5552 if (chk_length < sizeof(struct sctp_pktdrop_chunk)) { 5553 /* Its not ours */ 5554 if (locked_tcb) { 5555 SCTP_TCB_UNLOCK(locked_tcb); 5556 } 5557 *offset = length; 5558 return (NULL); 5559 } 5560 if (ch && (stcb) && netp && (*netp)) { 5561 if (stcb->asoc.pktdrop_supported == 0) { 5562 goto unknown_chunk; 5563 } 5564 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch, 5565 stcb, *netp, 5566 min(chk_length, (sizeof(chunk_buf) - 4))); 5567 5568 } 5569 break; 5570 case SCTP_AUTHENTICATION: 5571 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n"); 5572 if (stcb == NULL) { 5573 /* save the first AUTH for later processing */ 5574 if (auth_skipped == 0) { 5575 auth_offset = *offset; 5576 auth_len = chk_length; 5577 auth_skipped = 1; 5578 } 5579 /* skip this chunk (temporarily) */ 5580 goto next_chunk; 5581 } 5582 if (stcb->asoc.auth_supported == 0) { 5583 goto unknown_chunk; 5584 } 5585 if ((chk_length < (sizeof(struct sctp_auth_chunk))) || 5586 (chk_length > (sizeof(struct sctp_auth_chunk) + 5587 SCTP_AUTH_DIGEST_LEN_MAX))) { 5588 /* Its not ours */ 5589 if (locked_tcb) { 5590 SCTP_TCB_UNLOCK(locked_tcb); 5591 } 5592 *offset = length; 5593 return (NULL); 5594 } 5595 if (got_auth == 1) { 5596 /* skip this chunk... it's already auth'd */ 5597 goto next_chunk; 5598 } 5599 got_auth = 1; 5600 if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch, 5601 m, *offset)) { 5602 /* auth HMAC failed so dump the packet */ 5603 *offset = length; 5604 return (stcb); 5605 } else { 5606 /* remaining chunks are HMAC checked */ 5607 stcb->asoc.authenticated = 1; 5608 } 5609 break; 5610 5611 default: 5612 unknown_chunk: 5613 /* it's an unknown chunk! */ 5614 if ((ch->chunk_type & 0x40) && (stcb != NULL)) { 5615 struct sctp_gen_error_cause *cause; 5616 int len; 5617 5618 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_gen_error_cause), 5619 0, M_NOWAIT, 1, MT_DATA); 5620 if (op_err != NULL) { 5621 len = min(SCTP_SIZE32(chk_length), (uint32_t) (length - *offset)); 5622 cause = mtod(op_err, struct sctp_gen_error_cause *); 5623 cause->code = htons(SCTP_CAUSE_UNRECOG_CHUNK); 5624 cause->length = htons((uint16_t) (len + sizeof(struct sctp_gen_error_cause))); 5625 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_gen_error_cause); 5626 SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(m, *offset, len, M_NOWAIT); 5627 if (SCTP_BUF_NEXT(op_err) != NULL) { 5628#ifdef SCTP_MBUF_LOGGING 5629 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5630 sctp_log_mbc(SCTP_BUF_NEXT(op_err), SCTP_MBUF_ICOPY); 5631 } 5632#endif 5633 sctp_queue_op_err(stcb, op_err); 5634 } else { 5635 sctp_m_freem(op_err); 5636 } 5637 } 5638 } 5639 if ((ch->chunk_type & 0x80) == 0) { 5640 /* discard this packet */ 5641 *offset = length; 5642 return (stcb); 5643 } /* else skip this bad chunk and continue... */ 5644 break; 5645 } /* switch (ch->chunk_type) */ 5646 5647 5648next_chunk: 5649 /* get the next chunk */ 5650 *offset += SCTP_SIZE32(chk_length); 5651 if (*offset >= length) { 5652 /* no more data left in the mbuf chain */ 5653 break; 5654 } 5655 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 5656 sizeof(struct sctp_chunkhdr), chunk_buf); 5657 if (ch == NULL) { 5658 if (locked_tcb) { 5659 SCTP_TCB_UNLOCK(locked_tcb); 5660 } 5661 *offset = length; 5662 return (NULL); 5663 } 5664 } /* while */ 5665 5666 if (asconf_cnt > 0 && stcb != NULL) { 5667 sctp_send_asconf_ack(stcb); 5668 } 5669 return (stcb); 5670} 5671 5672 5673/* 5674 * common input chunk processing (v4 and v6) 5675 */ 5676void 5677sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length, 5678 struct sockaddr *src, struct sockaddr *dst, 5679 struct sctphdr *sh, struct sctp_chunkhdr *ch, 5680#if !defined(SCTP_WITH_NO_CSUM) 5681 uint8_t compute_crc, 5682#endif 5683 uint8_t ecn_bits, 5684 uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum, 5685 uint32_t vrf_id, uint16_t port) 5686{ 5687 uint32_t high_tsn; 5688 int fwd_tsn_seen = 0, data_processed = 0; 5689 struct mbuf *m = *mm, *op_err; 5690 char msg[SCTP_DIAG_INFO_LEN]; 5691 int un_sent; 5692 int cnt_ctrl_ready = 0; 5693 struct sctp_inpcb *inp = NULL, *inp_decr = NULL; 5694 struct sctp_tcb *stcb = NULL; 5695 struct sctp_nets *net = NULL; 5696 5697 SCTP_STAT_INCR(sctps_recvdatagrams); 5698#ifdef SCTP_AUDITING_ENABLED 5699 sctp_audit_log(0xE0, 1); 5700 sctp_auditing(0, inp, stcb, net); 5701#endif 5702#if !defined(SCTP_WITH_NO_CSUM) 5703 if (compute_crc != 0) { 5704 uint32_t check, calc_check; 5705 5706 check = sh->checksum; 5707 sh->checksum = 0; 5708 calc_check = sctp_calculate_cksum(m, iphlen); 5709 sh->checksum = check; 5710 if (calc_check != check) { 5711 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x m:%p mlen:%d iphlen:%d\n", 5712 calc_check, check, (void *)m, length, iphlen); 5713 stcb = sctp_findassociation_addr(m, offset, src, dst, 5714 sh, ch, &inp, &net, vrf_id); 5715#if defined(INET) || defined(INET6) 5716 if ((ch->chunk_type != SCTP_INITIATION) && 5717 (net != NULL) && (net->port != port)) { 5718 if (net->port == 0) { 5719 /* UDP encapsulation turned on. */ 5720 net->mtu -= sizeof(struct udphdr); 5721 if (stcb->asoc.smallest_mtu > net->mtu) { 5722 sctp_pathmtu_adjustment(stcb, net->mtu); 5723 } 5724 } else if (port == 0) { 5725 /* UDP encapsulation turned off. */ 5726 net->mtu += sizeof(struct udphdr); 5727 /* XXX Update smallest_mtu */ 5728 } 5729 net->port = port; 5730 } 5731#endif 5732 if (net != NULL) { 5733 net->flowtype = mflowtype; 5734 net->flowid = mflowid; 5735 } 5736 if ((inp != NULL) && (stcb != NULL)) { 5737 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1); 5738 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED); 5739 } else if ((inp != NULL) && (stcb == NULL)) { 5740 inp_decr = inp; 5741 } 5742 SCTP_STAT_INCR(sctps_badsum); 5743 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors); 5744 goto out; 5745 } 5746 } 5747#endif 5748 /* Destination port of 0 is illegal, based on RFC4960. */ 5749 if (sh->dest_port == 0) { 5750 SCTP_STAT_INCR(sctps_hdrops); 5751 goto out; 5752 } 5753 stcb = sctp_findassociation_addr(m, offset, src, dst, 5754 sh, ch, &inp, &net, vrf_id); 5755#if defined(INET) || defined(INET6) 5756 if ((ch->chunk_type != SCTP_INITIATION) && 5757 (net != NULL) && (net->port != port)) { 5758 if (net->port == 0) { 5759 /* UDP encapsulation turned on. */ 5760 net->mtu -= sizeof(struct udphdr); 5761 if (stcb->asoc.smallest_mtu > net->mtu) { 5762 sctp_pathmtu_adjustment(stcb, net->mtu); 5763 } 5764 } else if (port == 0) { 5765 /* UDP encapsulation turned off. */ 5766 net->mtu += sizeof(struct udphdr); 5767 /* XXX Update smallest_mtu */ 5768 } 5769 net->port = port; 5770 } 5771#endif 5772 if (net != NULL) { 5773 net->flowtype = mflowtype; 5774 net->flowid = mflowid; 5775 } 5776 if (inp == NULL) { 5777 SCTP_STAT_INCR(sctps_noport); 5778 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) { 5779 goto out; 5780 } 5781 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 5782 sctp_send_shutdown_complete2(src, dst, sh, 5783 mflowtype, mflowid, fibnum, 5784 vrf_id, port); 5785 goto out; 5786 } 5787 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) { 5788 goto out; 5789 } 5790 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) { 5791 if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) || 5792 ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) && 5793 (ch->chunk_type != SCTP_INIT))) { 5794 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5795 "Out of the blue"); 5796 sctp_send_abort(m, iphlen, src, dst, 5797 sh, 0, op_err, 5798 mflowtype, mflowid, fibnum, 5799 vrf_id, port); 5800 } 5801 } 5802 goto out; 5803 } else if (stcb == NULL) { 5804 inp_decr = inp; 5805 } 5806#ifdef IPSEC 5807 /*- 5808 * I very much doubt any of the IPSEC stuff will work but I have no 5809 * idea, so I will leave it in place. 5810 */ 5811 if (inp != NULL) { 5812 switch (dst->sa_family) { 5813#ifdef INET 5814 case AF_INET: 5815 if (ipsec4_in_reject(m, &inp->ip_inp.inp)) { 5816 SCTP_STAT_INCR(sctps_hdrops); 5817 goto out; 5818 } 5819 break; 5820#endif 5821#ifdef INET6 5822 case AF_INET6: 5823 if (ipsec6_in_reject(m, &inp->ip_inp.inp)) { 5824 SCTP_STAT_INCR(sctps_hdrops); 5825 goto out; 5826 } 5827 break; 5828#endif 5829 default: 5830 break; 5831 } 5832 } 5833#endif 5834 SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n", 5835 (void *)m, iphlen, offset, length, (void *)stcb); 5836 if (stcb) { 5837 /* always clear this before beginning a packet */ 5838 stcb->asoc.authenticated = 0; 5839 stcb->asoc.seen_a_sack_this_pkt = 0; 5840 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n", 5841 (void *)stcb, stcb->asoc.state); 5842 5843 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) || 5844 (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) { 5845 /*- 5846 * If we hit here, we had a ref count 5847 * up when the assoc was aborted and the 5848 * timer is clearing out the assoc, we should 5849 * NOT respond to any packet.. its OOTB. 5850 */ 5851 SCTP_TCB_UNLOCK(stcb); 5852 stcb = NULL; 5853 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5854 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5855 msg); 5856 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5857 mflowtype, mflowid, inp->fibnum, 5858 vrf_id, port); 5859 goto out; 5860 } 5861 } 5862 if (IS_SCTP_CONTROL(ch)) { 5863 /* process the control portion of the SCTP packet */ 5864 /* sa_ignore NO_NULL_CHK */ 5865 stcb = sctp_process_control(m, iphlen, &offset, length, 5866 src, dst, sh, ch, 5867 inp, stcb, &net, &fwd_tsn_seen, 5868 mflowtype, mflowid, fibnum, 5869 vrf_id, port); 5870 if (stcb) { 5871 /* 5872 * This covers us if the cookie-echo was there and 5873 * it changes our INP. 5874 */ 5875 inp = stcb->sctp_ep; 5876#if defined(INET) || defined(INET6) 5877 if ((ch->chunk_type != SCTP_INITIATION) && 5878 (net != NULL) && (net->port != port)) { 5879 if (net->port == 0) { 5880 /* UDP encapsulation turned on. */ 5881 net->mtu -= sizeof(struct udphdr); 5882 if (stcb->asoc.smallest_mtu > net->mtu) { 5883 sctp_pathmtu_adjustment(stcb, net->mtu); 5884 } 5885 } else if (port == 0) { 5886 /* UDP encapsulation turned off. */ 5887 net->mtu += sizeof(struct udphdr); 5888 /* XXX Update smallest_mtu */ 5889 } 5890 net->port = port; 5891 } 5892#endif 5893 } 5894 } else { 5895 /* 5896 * no control chunks, so pre-process DATA chunks (these 5897 * checks are taken care of by control processing) 5898 */ 5899 5900 /* 5901 * if DATA only packet, and auth is required, then punt... 5902 * can't have authenticated without any AUTH (control) 5903 * chunks 5904 */ 5905 if ((stcb != NULL) && 5906 (stcb->asoc.auth_supported == 1) && 5907 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) { 5908 /* "silently" ignore */ 5909 SCTP_STAT_INCR(sctps_recvauthmissing); 5910 goto out; 5911 } 5912 if (stcb == NULL) { 5913 /* out of the blue DATA chunk */ 5914 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5915 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5916 msg); 5917 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5918 mflowtype, mflowid, fibnum, 5919 vrf_id, port); 5920 goto out; 5921 } 5922 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) { 5923 /* v_tag mismatch! */ 5924 SCTP_STAT_INCR(sctps_badvtag); 5925 goto out; 5926 } 5927 } 5928 5929 if (stcb == NULL) { 5930 /* 5931 * no valid TCB for this packet, or we found it's a bad 5932 * packet while processing control, or we're done with this 5933 * packet (done or skip rest of data), so we drop it... 5934 */ 5935 goto out; 5936 } 5937 /* 5938 * DATA chunk processing 5939 */ 5940 /* plow through the data chunks while length > offset */ 5941 5942 /* 5943 * Rest should be DATA only. Check authentication state if AUTH for 5944 * DATA is required. 5945 */ 5946 if ((length > offset) && 5947 (stcb != NULL) && 5948 (stcb->asoc.auth_supported == 1) && 5949 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) && 5950 !stcb->asoc.authenticated) { 5951 /* "silently" ignore */ 5952 SCTP_STAT_INCR(sctps_recvauthmissing); 5953 SCTPDBG(SCTP_DEBUG_AUTH1, 5954 "Data chunk requires AUTH, skipped\n"); 5955 goto trigger_send; 5956 } 5957 if (length > offset) { 5958 int retval; 5959 5960 /* 5961 * First check to make sure our state is correct. We would 5962 * not get here unless we really did have a tag, so we don't 5963 * abort if this happens, just dump the chunk silently. 5964 */ 5965 switch (SCTP_GET_STATE(&stcb->asoc)) { 5966 case SCTP_STATE_COOKIE_ECHOED: 5967 /* 5968 * we consider data with valid tags in this state 5969 * shows us the cookie-ack was lost. Imply it was 5970 * there. 5971 */ 5972 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5973 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5974 stcb->asoc.overall_error_count, 5975 0, 5976 SCTP_FROM_SCTP_INPUT, 5977 __LINE__); 5978 } 5979 stcb->asoc.overall_error_count = 0; 5980 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net); 5981 break; 5982 case SCTP_STATE_COOKIE_WAIT: 5983 /* 5984 * We consider OOTB any data sent during asoc setup. 5985 */ 5986 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5987 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5988 msg); 5989 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5990 mflowtype, mflowid, inp->fibnum, 5991 vrf_id, port); 5992 goto out; 5993 /* sa_ignore NOTREACHED */ 5994 break; 5995 case SCTP_STATE_EMPTY: /* should not happen */ 5996 case SCTP_STATE_INUSE: /* should not happen */ 5997 case SCTP_STATE_SHUTDOWN_RECEIVED: /* This is a peer error */ 5998 case SCTP_STATE_SHUTDOWN_ACK_SENT: 5999 default: 6000 goto out; 6001 /* sa_ignore NOTREACHED */ 6002 break; 6003 case SCTP_STATE_OPEN: 6004 case SCTP_STATE_SHUTDOWN_SENT: 6005 break; 6006 } 6007 /* plow through the data chunks while length > offset */ 6008 retval = sctp_process_data(mm, iphlen, &offset, length, 6009 inp, stcb, net, &high_tsn); 6010 if (retval == 2) { 6011 /* 6012 * The association aborted, NO UNLOCK needed since 6013 * the association is destroyed. 6014 */ 6015 stcb = NULL; 6016 goto out; 6017 } 6018 data_processed = 1; 6019 /* 6020 * Anything important needs to have been m_copy'ed in 6021 * process_data 6022 */ 6023 } 6024 /* take care of ecn */ 6025 if ((data_processed == 1) && 6026 (stcb->asoc.ecn_supported == 1) && 6027 ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) { 6028 /* Yep, we need to add a ECNE */ 6029 sctp_send_ecn_echo(stcb, net, high_tsn); 6030 } 6031 if ((data_processed == 0) && (fwd_tsn_seen)) { 6032 int was_a_gap; 6033 uint32_t highest_tsn; 6034 6035 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) { 6036 highest_tsn = stcb->asoc.highest_tsn_inside_nr_map; 6037 } else { 6038 highest_tsn = stcb->asoc.highest_tsn_inside_map; 6039 } 6040 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn); 6041 stcb->asoc.send_sack = 1; 6042 sctp_sack_check(stcb, was_a_gap); 6043 } else if (fwd_tsn_seen) { 6044 stcb->asoc.send_sack = 1; 6045 } 6046 /* trigger send of any chunks in queue... */ 6047trigger_send: 6048#ifdef SCTP_AUDITING_ENABLED 6049 sctp_audit_log(0xE0, 2); 6050 sctp_auditing(1, inp, stcb, net); 6051#endif 6052 SCTPDBG(SCTP_DEBUG_INPUT1, 6053 "Check for chunk output prw:%d tqe:%d tf=%d\n", 6054 stcb->asoc.peers_rwnd, 6055 TAILQ_EMPTY(&stcb->asoc.control_send_queue), 6056 stcb->asoc.total_flight); 6057 un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight); 6058 if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 6059 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq; 6060 } 6061 if (!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue) || 6062 cnt_ctrl_ready || 6063 stcb->asoc.trigger_reset || 6064 ((un_sent) && 6065 (stcb->asoc.peers_rwnd > 0 || 6066 (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) { 6067 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n"); 6068 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 6069 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n"); 6070 } 6071#ifdef SCTP_AUDITING_ENABLED 6072 sctp_audit_log(0xE0, 3); 6073 sctp_auditing(2, inp, stcb, net); 6074#endif 6075out: 6076 if (stcb != NULL) { 6077 SCTP_TCB_UNLOCK(stcb); 6078 } 6079 if (inp_decr != NULL) { 6080 /* reduce ref-count */ 6081 SCTP_INP_WLOCK(inp_decr); 6082 SCTP_INP_DECR_REF(inp_decr); 6083 SCTP_INP_WUNLOCK(inp_decr); 6084 } 6085 return; 6086} 6087 6088#ifdef INET 6089void 6090sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port) 6091{ 6092 struct mbuf *m; 6093 int iphlen; 6094 uint32_t vrf_id = 0; 6095 uint8_t ecn_bits; 6096 struct sockaddr_in src, dst; 6097 struct ip *ip; 6098 struct sctphdr *sh; 6099 struct sctp_chunkhdr *ch; 6100 int length, offset; 6101 6102#if !defined(SCTP_WITH_NO_CSUM) 6103 uint8_t compute_crc; 6104 6105#endif 6106 uint32_t mflowid; 6107 uint8_t mflowtype; 6108 uint16_t fibnum; 6109 6110 iphlen = off; 6111 if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) { 6112 SCTP_RELEASE_PKT(i_pak); 6113 return; 6114 } 6115 m = SCTP_HEADER_TO_CHAIN(i_pak); 6116#ifdef SCTP_MBUF_LOGGING 6117 /* Log in any input mbufs */ 6118 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 6119 sctp_log_mbc(m, SCTP_MBUF_INPUT); 6120 } 6121#endif 6122#ifdef SCTP_PACKET_LOGGING 6123 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) { 6124 sctp_packet_log(m); 6125 } 6126#endif 6127 SCTPDBG(SCTP_DEBUG_CRCOFFLOAD, 6128 "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n", 6129 m->m_pkthdr.len, 6130 if_name(m->m_pkthdr.rcvif), 6131 (int)m->m_pkthdr.csum_flags, CSUM_BITS); 6132 mflowid = m->m_pkthdr.flowid; 6133 mflowtype = M_HASHTYPE_GET(m); 6134 fibnum = M_GETFIB(m); 6135 SCTP_STAT_INCR(sctps_recvpackets); 6136 SCTP_STAT_INCR_COUNTER64(sctps_inpackets); 6137 /* Get IP, SCTP, and first chunk header together in the first mbuf. */ 6138 offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr); 6139 if (SCTP_BUF_LEN(m) < offset) { 6140 if ((m = m_pullup(m, offset)) == NULL) { 6141 SCTP_STAT_INCR(sctps_hdrops); 6142 return; 6143 } 6144 } 6145 ip = mtod(m, struct ip *); 6146 sh = (struct sctphdr *)((caddr_t)ip + iphlen); 6147 ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr)); 6148 offset -= sizeof(struct sctp_chunkhdr); 6149 memset(&src, 0, sizeof(struct sockaddr_in)); 6150 src.sin_family = AF_INET; 6151 src.sin_len = sizeof(struct sockaddr_in); 6152 src.sin_port = sh->src_port; 6153 src.sin_addr = ip->ip_src; 6154 memset(&dst, 0, sizeof(struct sockaddr_in)); 6155 dst.sin_family = AF_INET; 6156 dst.sin_len = sizeof(struct sockaddr_in); 6157 dst.sin_port = sh->dest_port; 6158 dst.sin_addr = ip->ip_dst; 6159 length = ntohs(ip->ip_len); 6160 /* Validate mbuf chain length with IP payload length. */ 6161 if (SCTP_HEADER_LEN(m) != length) { 6162 SCTPDBG(SCTP_DEBUG_INPUT1, 6163 "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m)); 6164 SCTP_STAT_INCR(sctps_hdrops); 6165 goto out; 6166 } 6167 /* SCTP does not allow broadcasts or multicasts */ 6168 if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) { 6169 goto out; 6170 } 6171 if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) { 6172 goto out; 6173 } 6174 ecn_bits = ip->ip_tos; 6175#if defined(SCTP_WITH_NO_CSUM) 6176 SCTP_STAT_INCR(sctps_recvnocrc); 6177#else 6178 if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) { 6179 SCTP_STAT_INCR(sctps_recvhwcrc); 6180 compute_crc = 0; 6181 } else { 6182 SCTP_STAT_INCR(sctps_recvswcrc); 6183 compute_crc = 1; 6184 } 6185#endif 6186 sctp_common_input_processing(&m, iphlen, offset, length, 6187 (struct sockaddr *)&src, 6188 (struct sockaddr *)&dst, 6189 sh, ch, 6190#if !defined(SCTP_WITH_NO_CSUM) 6191 compute_crc, 6192#endif 6193 ecn_bits, 6194 mflowtype, mflowid, fibnum, 6195 vrf_id, port); 6196out: 6197 if (m) { 6198 sctp_m_freem(m); 6199 } 6200 return; 6201} 6202 6203#if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP) 6204extern int *sctp_cpuarry; 6205 6206#endif 6207 6208int 6209sctp_input(struct mbuf **mp, int *offp, int proto SCTP_UNUSED) 6210{ 6211 struct mbuf *m; 6212 int off; 6213 6214 m = *mp; 6215 off = *offp; 6216#if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP) 6217 if (mp_ncpus > 1) { 6218 struct ip *ip; 6219 struct sctphdr *sh; 6220 int offset; 6221 int cpu_to_use; 6222 uint32_t flowid, tag; 6223 6224 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) { 6225 flowid = m->m_pkthdr.flowid; 6226 } else { 6227 /* 6228 * No flow id built by lower layers fix it so we 6229 * create one. 6230 */ 6231 offset = off + sizeof(struct sctphdr); 6232 if (SCTP_BUF_LEN(m) < offset) { 6233 if ((m = m_pullup(m, offset)) == NULL) { 6234 SCTP_STAT_INCR(sctps_hdrops); 6235 return (IPPROTO_DONE); 6236 } 6237 } 6238 ip = mtod(m, struct ip *); 6239 sh = (struct sctphdr *)((caddr_t)ip + off); 6240 tag = htonl(sh->v_tag); 6241 flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port); 6242 m->m_pkthdr.flowid = flowid; 6243 M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE); 6244 } 6245 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus]; 6246 sctp_queue_to_mcore(m, off, cpu_to_use); 6247 return (IPPROTO_DONE); 6248 } 6249#endif 6250 sctp_input_with_port(m, off, 0); 6251 return (IPPROTO_DONE); 6252} 6253 6254#endif 6255