1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved. 5 * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved. 6 * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions are met: 10 * 11 * a) Redistributions of source code must retain the above copyright notice, 12 * this list of conditions and the following disclaimer. 13 * 14 * b) Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in 16 * the documentation and/or other materials provided with the distribution. 17 * 18 * c) Neither the name of Cisco Systems, Inc. nor the names of its 19 * contributors may be used to endorse or promote products derived 20 * from this software without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 23 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 24 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 26 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 28 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 29 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 30 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 31 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 32 * THE POSSIBILITY OF SUCH DAMAGE. 33 */ 34 35 #include <sys/cdefs.h> 36 __FBSDID("$FreeBSD$"); 37 38 #include <netinet/sctp_os.h> 39 #include <netinet/sctp_var.h> 40 #include <netinet/sctp_sysctl.h> 41 #include <netinet/sctp_pcb.h> 42 #include <netinet/sctp_header.h> 43 #include <netinet/sctputil.h> 44 #include <netinet/sctp_output.h> 45 #include <netinet/sctp_input.h> 46 #include <netinet/sctp_auth.h> 47 #include <netinet/sctp_indata.h> 48 #include <netinet/sctp_asconf.h> 49 #include <netinet/sctp_bsd_addr.h> 50 #include <netinet/sctp_timer.h> 51 #include <netinet/sctp_crc32.h> 52 #include <netinet/sctp_kdtrace.h> 53 #if defined(INET) || defined(INET6) 54 #include <netinet/udp.h> 55 #endif 56 #include <sys/smp.h> 57 58 static void 59 sctp_stop_all_cookie_timers(struct sctp_tcb *stcb) 60 { 61 struct sctp_nets *net; 62 63 /* 64 * This now not only stops all cookie timers it also stops any INIT 65 * timers as well. This will make sure that the timers are stopped 66 * in all collision cases. 67 */ 68 SCTP_TCB_LOCK_ASSERT(stcb); 69 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 70 if (net->rxt_timer.type == SCTP_TIMER_TYPE_COOKIE) { 71 sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE, 72 stcb->sctp_ep, 73 stcb, 74 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_1); 75 } else if (net->rxt_timer.type == SCTP_TIMER_TYPE_INIT) { 76 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, 77 stcb->sctp_ep, 78 stcb, 79 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_2); 80 } 81 } 82 } 83 84 /* INIT handler */ 85 static void 86 sctp_handle_init(struct mbuf *m, int iphlen, int offset, 87 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 88 struct sctp_init_chunk *cp, struct sctp_inpcb *inp, 89 struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_no_unlock, 90 uint8_t mflowtype, uint32_t mflowid, 91 uint32_t vrf_id, uint16_t port) 92 { 93 struct sctp_init *init; 94 struct mbuf *op_err; 95 96 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_init: handling INIT tcb:%p\n", 97 (void *)stcb); 98 if (stcb == NULL) { 99 SCTP_INP_RLOCK(inp); 100 } 101 /* Validate parameters */ 102 init = &cp->init; 103 if ((ntohl(init->initiate_tag) == 0) || 104 (ntohl(init->a_rwnd) < SCTP_MIN_RWND) || 105 (ntohs(init->num_inbound_streams) == 0) || 106 (ntohs(init->num_outbound_streams) == 0)) { 107 /* protocol error... send abort */ 108 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 109 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 110 mflowtype, mflowid, 111 vrf_id, port); 112 if (stcb) 113 *abort_no_unlock = 1; 114 goto outnow; 115 } 116 if (sctp_validate_init_auth_params(m, offset + sizeof(*cp), 117 offset + ntohs(cp->ch.chunk_length))) { 118 /* auth parameter(s) error... send abort */ 119 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 120 "Problem with AUTH parameters"); 121 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 122 mflowtype, mflowid, 123 vrf_id, port); 124 if (stcb) 125 *abort_no_unlock = 1; 126 goto outnow; 127 } 128 /* We are only accepting if we have a listening socket. */ 129 if ((stcb == NULL) && 130 ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 131 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) || 132 (!SCTP_IS_LISTENING(inp)))) { 133 /* 134 * FIX ME ?? What about TCP model and we have a 135 * match/restart case? Actually no fix is needed. the lookup 136 * will always find the existing assoc so stcb would not be 137 * NULL. It may be questionable to do this since we COULD 138 * just send back the INIT-ACK and hope that the app did 139 * accept()'s by the time the COOKIE was sent. But there is 140 * a price to pay for COOKIE generation and I don't want to 141 * pay it on the chance that the app will actually do some 142 * accepts(). The App just looses and should NOT be in this 143 * state :-) 144 */ 145 if (SCTP_BASE_SYSCTL(sctp_blackhole) == 0) { 146 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 147 "No listener"); 148 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err, 149 mflowtype, mflowid, inp->fibnum, 150 vrf_id, port); 151 } 152 goto outnow; 153 } 154 if ((stcb != NULL) && 155 (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT)) { 156 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending SHUTDOWN-ACK\n"); 157 sctp_send_shutdown_ack(stcb, NULL); 158 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 159 } else { 160 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n"); 161 sctp_send_initiate_ack(inp, stcb, net, m, iphlen, offset, 162 src, dst, sh, cp, 163 mflowtype, mflowid, 164 vrf_id, port); 165 } 166 outnow: 167 if (stcb == NULL) { 168 SCTP_INP_RUNLOCK(inp); 169 } 170 } 171 172 /* 173 * process peer "INIT/INIT-ACK" chunk returns value < 0 on error 174 */ 175 176 int 177 sctp_is_there_unsent_data(struct sctp_tcb *stcb, int so_locked) 178 { 179 int unsent_data; 180 unsigned int i; 181 struct sctp_stream_queue_pending *sp; 182 struct sctp_association *asoc; 183 184 /* 185 * This function returns if any stream has true unsent data on it. 186 * Note that as it looks through it will clean up any places that 187 * have old data that has been sent but left at top of stream queue. 188 */ 189 asoc = &stcb->asoc; 190 unsent_data = 0; 191 SCTP_TCB_SEND_LOCK(stcb); 192 if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 193 /* Check to see if some data queued */ 194 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 195 /* sa_ignore FREED_MEMORY */ 196 sp = TAILQ_FIRST(&stcb->asoc.strmout[i].outqueue); 197 if (sp == NULL) { 198 continue; 199 } 200 if ((sp->msg_is_complete) && 201 (sp->length == 0) && 202 (sp->sender_all_done)) { 203 /* 204 * We are doing differed cleanup. Last time 205 * through when we took all the data the 206 * sender_all_done was not set. 207 */ 208 if (sp->put_last_out == 0) { 209 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n"); 210 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n", 211 sp->sender_all_done, 212 sp->length, 213 sp->msg_is_complete, 214 sp->put_last_out); 215 } 216 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1); 217 TAILQ_REMOVE(&stcb->asoc.strmout[i].outqueue, sp, next); 218 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, &asoc->strmout[i], sp, 1); 219 if (sp->net) { 220 sctp_free_remote_addr(sp->net); 221 sp->net = NULL; 222 } 223 if (sp->data) { 224 sctp_m_freem(sp->data); 225 sp->data = NULL; 226 } 227 sctp_free_a_strmoq(stcb, sp, so_locked); 228 if (!TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) { 229 unsent_data++; 230 } 231 } else { 232 unsent_data++; 233 } 234 if (unsent_data > 0) { 235 break; 236 } 237 } 238 } 239 SCTP_TCB_SEND_UNLOCK(stcb); 240 return (unsent_data); 241 } 242 243 static int 244 sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb) 245 { 246 struct sctp_init *init; 247 struct sctp_association *asoc; 248 struct sctp_nets *lnet; 249 unsigned int i; 250 251 init = &cp->init; 252 asoc = &stcb->asoc; 253 /* save off parameters */ 254 asoc->peer_vtag = ntohl(init->initiate_tag); 255 asoc->peers_rwnd = ntohl(init->a_rwnd); 256 /* init tsn's */ 257 asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1; 258 259 if (!TAILQ_EMPTY(&asoc->nets)) { 260 /* update any ssthresh's that may have a default */ 261 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) { 262 lnet->ssthresh = asoc->peers_rwnd; 263 if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) { 264 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION); 265 } 266 } 267 } 268 SCTP_TCB_SEND_LOCK(stcb); 269 if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) { 270 unsigned int newcnt; 271 struct sctp_stream_out *outs; 272 struct sctp_stream_queue_pending *sp, *nsp; 273 struct sctp_tmit_chunk *chk, *nchk; 274 275 /* abandon the upper streams */ 276 newcnt = ntohs(init->num_inbound_streams); 277 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) { 278 if (chk->rec.data.sid >= newcnt) { 279 TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next); 280 asoc->send_queue_cnt--; 281 if (asoc->strmout[chk->rec.data.sid].chunks_on_queues > 0) { 282 asoc->strmout[chk->rec.data.sid].chunks_on_queues--; 283 #ifdef INVARIANTS 284 } else { 285 panic("No chunks on the queues for sid %u.", chk->rec.data.sid); 286 #endif 287 } 288 if (chk->data != NULL) { 289 sctp_free_bufspace(stcb, asoc, chk, 1); 290 sctp_ulp_notify(SCTP_NOTIFY_UNSENT_DG_FAIL, stcb, 291 0, chk, SCTP_SO_NOT_LOCKED); 292 if (chk->data) { 293 sctp_m_freem(chk->data); 294 chk->data = NULL; 295 } 296 } 297 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 298 /* sa_ignore FREED_MEMORY */ 299 } 300 } 301 if (asoc->strmout) { 302 for (i = newcnt; i < asoc->pre_open_streams; i++) { 303 outs = &asoc->strmout[i]; 304 TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) { 305 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1); 306 TAILQ_REMOVE(&outs->outqueue, sp, next); 307 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, outs, sp, 1); 308 sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL, 309 stcb, 0, sp, SCTP_SO_NOT_LOCKED); 310 if (sp->data) { 311 sctp_m_freem(sp->data); 312 sp->data = NULL; 313 } 314 if (sp->net) { 315 sctp_free_remote_addr(sp->net); 316 sp->net = NULL; 317 } 318 /* Free the chunk */ 319 sctp_free_a_strmoq(stcb, sp, SCTP_SO_NOT_LOCKED); 320 /* sa_ignore FREED_MEMORY */ 321 } 322 outs->state = SCTP_STREAM_CLOSED; 323 } 324 } 325 /* cut back the count */ 326 asoc->pre_open_streams = newcnt; 327 } 328 SCTP_TCB_SEND_UNLOCK(stcb); 329 asoc->streamoutcnt = asoc->pre_open_streams; 330 if (asoc->strmout) { 331 for (i = 0; i < asoc->streamoutcnt; i++) { 332 asoc->strmout[i].state = SCTP_STREAM_OPEN; 333 } 334 } 335 /* EY - nr_sack: initialize highest tsn in nr_mapping_array */ 336 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 337 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 338 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 339 } 340 /* This is the next one we expect */ 341 asoc->str_reset_seq_in = asoc->asconf_seq_in + 1; 342 343 asoc->mapping_array_base_tsn = ntohl(init->initial_tsn); 344 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in; 345 346 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 347 /* open the requested streams */ 348 349 if (asoc->strmin != NULL) { 350 /* Free the old ones */ 351 for (i = 0; i < asoc->streamincnt; i++) { 352 sctp_clean_up_stream(stcb, &asoc->strmin[i].inqueue); 353 sctp_clean_up_stream(stcb, &asoc->strmin[i].uno_inqueue); 354 } 355 SCTP_FREE(asoc->strmin, SCTP_M_STRMI); 356 } 357 if (asoc->max_inbound_streams > ntohs(init->num_outbound_streams)) { 358 asoc->streamincnt = ntohs(init->num_outbound_streams); 359 } else { 360 asoc->streamincnt = asoc->max_inbound_streams; 361 } 362 SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt * 363 sizeof(struct sctp_stream_in), SCTP_M_STRMI); 364 if (asoc->strmin == NULL) { 365 /* we didn't get memory for the streams! */ 366 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n"); 367 return (-1); 368 } 369 for (i = 0; i < asoc->streamincnt; i++) { 370 asoc->strmin[i].sid = i; 371 asoc->strmin[i].last_mid_delivered = 0xffffffff; 372 TAILQ_INIT(&asoc->strmin[i].inqueue); 373 TAILQ_INIT(&asoc->strmin[i].uno_inqueue); 374 asoc->strmin[i].pd_api_started = 0; 375 asoc->strmin[i].delivery_started = 0; 376 } 377 /* 378 * load_address_from_init will put the addresses into the 379 * association when the COOKIE is processed or the INIT-ACK is 380 * processed. Both types of COOKIE's existing and new call this 381 * routine. It will remove addresses that are no longer in the 382 * association (for the restarting case where addresses are 383 * removed). Up front when the INIT arrives we will discard it if it 384 * is a restart and new addresses have been added. 385 */ 386 /* sa_ignore MEMLEAK */ 387 return (0); 388 } 389 390 /* 391 * INIT-ACK message processing/consumption returns value < 0 on error 392 */ 393 static int 394 sctp_process_init_ack(struct mbuf *m, int iphlen, int offset, 395 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 396 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 397 struct sctp_nets *net, int *abort_no_unlock, 398 uint8_t mflowtype, uint32_t mflowid, 399 uint32_t vrf_id) 400 { 401 struct sctp_association *asoc; 402 struct mbuf *op_err; 403 int retval, abort_flag, cookie_found; 404 int initack_limit; 405 int nat_friendly = 0; 406 407 /* First verify that we have no illegal param's */ 408 abort_flag = 0; 409 cookie_found = 0; 410 411 op_err = sctp_arethere_unrecognized_parameters(m, 412 (offset + sizeof(struct sctp_init_chunk)), 413 &abort_flag, (struct sctp_chunkhdr *)cp, 414 &nat_friendly, &cookie_found); 415 if (abort_flag) { 416 /* Send an abort and notify peer */ 417 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 418 *abort_no_unlock = 1; 419 return (-1); 420 } 421 if (!cookie_found) { 422 uint16_t len; 423 424 /* Only report the missing cookie parameter */ 425 if (op_err != NULL) { 426 sctp_m_freem(op_err); 427 } 428 len = (uint16_t)(sizeof(struct sctp_error_missing_param) + sizeof(uint16_t)); 429 /* We abort with an error of missing mandatory param */ 430 op_err = sctp_get_mbuf_for_msg(len, 0, M_NOWAIT, 1, MT_DATA); 431 if (op_err != NULL) { 432 struct sctp_error_missing_param *cause; 433 434 SCTP_BUF_LEN(op_err) = len; 435 cause = mtod(op_err, struct sctp_error_missing_param *); 436 /* Subtract the reserved param */ 437 cause->cause.code = htons(SCTP_CAUSE_MISSING_PARAM); 438 cause->cause.length = htons(len); 439 cause->num_missing_params = htonl(1); 440 cause->type[0] = htons(SCTP_STATE_COOKIE); 441 } 442 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 443 src, dst, sh, op_err, 444 mflowtype, mflowid, 445 vrf_id, net->port); 446 *abort_no_unlock = 1; 447 return (-3); 448 } 449 asoc = &stcb->asoc; 450 asoc->peer_supports_nat = (uint8_t)nat_friendly; 451 /* process the peer's parameters in the INIT-ACK */ 452 retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb); 453 if (retval < 0) { 454 if (op_err != NULL) { 455 sctp_m_freem(op_err); 456 } 457 return (retval); 458 } 459 initack_limit = offset + ntohs(cp->ch.chunk_length); 460 /* load all addresses */ 461 if ((retval = sctp_load_addresses_from_init(stcb, m, 462 (offset + sizeof(struct sctp_init_chunk)), initack_limit, 463 src, dst, NULL, stcb->asoc.port))) { 464 if (op_err != NULL) { 465 sctp_m_freem(op_err); 466 } 467 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 468 "Problem with address parameters"); 469 SCTPDBG(SCTP_DEBUG_INPUT1, 470 "Load addresses from INIT causes an abort %d\n", 471 retval); 472 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 473 src, dst, sh, op_err, 474 mflowtype, mflowid, 475 vrf_id, net->port); 476 *abort_no_unlock = 1; 477 return (-1); 478 } 479 /* if the peer doesn't support asconf, flush the asconf queue */ 480 if (asoc->asconf_supported == 0) { 481 struct sctp_asconf_addr *param, *nparam; 482 483 TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) { 484 TAILQ_REMOVE(&asoc->asconf_queue, param, next); 485 SCTP_FREE(param, SCTP_M_ASC_ADDR); 486 } 487 } 488 489 stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs, 490 stcb->asoc.local_hmacs); 491 if (op_err) { 492 sctp_queue_op_err(stcb, op_err); 493 /* queuing will steal away the mbuf chain to the out queue */ 494 op_err = NULL; 495 } 496 /* extract the cookie and queue it to "echo" it back... */ 497 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 498 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 499 stcb->asoc.overall_error_count, 500 0, 501 SCTP_FROM_SCTP_INPUT, 502 __LINE__); 503 } 504 stcb->asoc.overall_error_count = 0; 505 net->error_count = 0; 506 507 /* 508 * Cancel the INIT timer, We do this first before queueing the 509 * cookie. We always cancel at the primary to assue that we are 510 * canceling the timer started by the INIT which always goes to the 511 * primary. 512 */ 513 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb, 514 asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3); 515 516 /* calculate the RTO */ 517 sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, 518 SCTP_RTT_FROM_NON_DATA); 519 retval = sctp_send_cookie_echo(m, offset, initack_limit, stcb, net); 520 return (retval); 521 } 522 523 static void 524 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp, 525 struct sctp_tcb *stcb, struct sctp_nets *net) 526 { 527 union sctp_sockstore store; 528 struct sctp_nets *r_net, *f_net; 529 struct timeval tv; 530 int req_prim = 0; 531 uint16_t old_error_counter; 532 533 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) { 534 /* Invalid length */ 535 return; 536 } 537 538 memset(&store, 0, sizeof(store)); 539 switch (cp->heartbeat.hb_info.addr_family) { 540 #ifdef INET 541 case AF_INET: 542 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) { 543 store.sin.sin_family = cp->heartbeat.hb_info.addr_family; 544 store.sin.sin_len = cp->heartbeat.hb_info.addr_len; 545 store.sin.sin_port = stcb->rport; 546 memcpy(&store.sin.sin_addr, cp->heartbeat.hb_info.address, 547 sizeof(store.sin.sin_addr)); 548 } else { 549 return; 550 } 551 break; 552 #endif 553 #ifdef INET6 554 case AF_INET6: 555 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) { 556 store.sin6.sin6_family = cp->heartbeat.hb_info.addr_family; 557 store.sin6.sin6_len = cp->heartbeat.hb_info.addr_len; 558 store.sin6.sin6_port = stcb->rport; 559 memcpy(&store.sin6.sin6_addr, cp->heartbeat.hb_info.address, sizeof(struct in6_addr)); 560 } else { 561 return; 562 } 563 break; 564 #endif 565 default: 566 return; 567 } 568 r_net = sctp_findnet(stcb, &store.sa); 569 if (r_net == NULL) { 570 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n"); 571 return; 572 } 573 if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) && 574 (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) && 575 (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) { 576 /* 577 * If the its a HB and it's random value is correct when can 578 * confirm the destination. 579 */ 580 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 581 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) { 582 stcb->asoc.primary_destination = r_net; 583 r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY; 584 f_net = TAILQ_FIRST(&stcb->asoc.nets); 585 if (f_net != r_net) { 586 /* 587 * first one on the list is NOT the primary 588 * sctp_cmpaddr() is much more efficient if 589 * the primary is the first on the list, 590 * make it so. 591 */ 592 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next); 593 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next); 594 } 595 req_prim = 1; 596 } 597 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 598 stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 599 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, 600 r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4); 601 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 602 } 603 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 604 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 605 stcb->asoc.overall_error_count, 606 0, 607 SCTP_FROM_SCTP_INPUT, 608 __LINE__); 609 } 610 stcb->asoc.overall_error_count = 0; 611 old_error_counter = r_net->error_count; 612 r_net->error_count = 0; 613 r_net->hb_responded = 1; 614 tv.tv_sec = cp->heartbeat.hb_info.time_value_1; 615 tv.tv_usec = cp->heartbeat.hb_info.time_value_2; 616 /* Now lets do a RTO with this */ 617 sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, 618 SCTP_RTT_FROM_NON_DATA); 619 if (!(r_net->dest_state & SCTP_ADDR_REACHABLE)) { 620 r_net->dest_state |= SCTP_ADDR_REACHABLE; 621 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb, 622 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 623 } 624 if (r_net->dest_state & SCTP_ADDR_PF) { 625 r_net->dest_state &= ~SCTP_ADDR_PF; 626 stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net); 627 } 628 if (old_error_counter > 0) { 629 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 630 stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_5); 631 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 632 } 633 if (r_net == stcb->asoc.primary_destination) { 634 if (stcb->asoc.alternate) { 635 /* release the alternate, primary is good */ 636 sctp_free_remote_addr(stcb->asoc.alternate); 637 stcb->asoc.alternate = NULL; 638 } 639 } 640 /* Mobility adaptation */ 641 if (req_prim) { 642 if ((sctp_is_mobility_feature_on(stcb->sctp_ep, 643 SCTP_MOBILITY_BASE) || 644 sctp_is_mobility_feature_on(stcb->sctp_ep, 645 SCTP_MOBILITY_FASTHANDOFF)) && 646 sctp_is_mobility_feature_on(stcb->sctp_ep, 647 SCTP_MOBILITY_PRIM_DELETED)) { 648 sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED, 649 stcb->sctp_ep, stcb, NULL, 650 SCTP_FROM_SCTP_INPUT + SCTP_LOC_6); 651 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 652 SCTP_MOBILITY_FASTHANDOFF)) { 653 sctp_assoc_immediate_retrans(stcb, 654 stcb->asoc.primary_destination); 655 } 656 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 657 SCTP_MOBILITY_BASE)) { 658 sctp_move_chunks_from_net(stcb, 659 stcb->asoc.deleted_primary); 660 } 661 sctp_delete_prim_timer(stcb->sctp_ep, stcb); 662 } 663 } 664 } 665 666 static int 667 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb) 668 { 669 /* 670 * Return 0 means we want you to proceed with the abort non-zero 671 * means no abort processing. 672 */ 673 uint32_t new_vtag; 674 struct sctpasochead *head; 675 676 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || 677 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 678 new_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 679 atomic_add_int(&stcb->asoc.refcnt, 1); 680 SCTP_TCB_UNLOCK(stcb); 681 SCTP_INP_INFO_WLOCK(); 682 SCTP_TCB_LOCK(stcb); 683 atomic_subtract_int(&stcb->asoc.refcnt, 1); 684 } else { 685 return (0); 686 } 687 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) { 688 /* generate a new vtag and send init */ 689 LIST_REMOVE(stcb, sctp_asocs); 690 stcb->asoc.my_vtag = new_vtag; 691 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 692 /* 693 * put it in the bucket in the vtag hash of assoc's for the 694 * system 695 */ 696 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 697 SCTP_INP_INFO_WUNLOCK(); 698 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 699 return (1); 700 } else { 701 /* 702 * treat like a case where the cookie expired i.e.: - dump 703 * current cookie. - generate a new vtag. - resend init. 704 */ 705 /* generate a new vtag and send init */ 706 LIST_REMOVE(stcb, sctp_asocs); 707 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT); 708 sctp_stop_all_cookie_timers(stcb); 709 sctp_toss_old_cookies(stcb, &stcb->asoc); 710 stcb->asoc.my_vtag = new_vtag; 711 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 712 /* 713 * put it in the bucket in the vtag hash of assoc's for the 714 * system 715 */ 716 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 717 SCTP_INP_INFO_WUNLOCK(); 718 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 719 return (1); 720 } 721 return (0); 722 } 723 724 static int 725 sctp_handle_nat_missing_state(struct sctp_tcb *stcb, 726 struct sctp_nets *net) 727 { 728 /* 729 * return 0 means we want you to proceed with the abort non-zero 730 * means no abort processing 731 */ 732 if (stcb->asoc.auth_supported == 0) { 733 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n"); 734 return (0); 735 } 736 sctp_asconf_send_nat_state_update(stcb, net); 737 return (1); 738 } 739 740 /* Returns 1 if the stcb was aborted, 0 otherwise */ 741 static int 742 sctp_handle_abort(struct sctp_abort_chunk *abort, 743 struct sctp_tcb *stcb, struct sctp_nets *net) 744 { 745 uint16_t len; 746 uint16_t error; 747 748 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n"); 749 if (stcb == NULL) 750 return (0); 751 752 len = ntohs(abort->ch.chunk_length); 753 if (len >= sizeof(struct sctp_chunkhdr) + sizeof(struct sctp_error_cause)) { 754 /* 755 * Need to check the cause codes for our two magic nat 756 * aborts which don't kill the assoc necessarily. 757 */ 758 struct sctp_error_cause *cause; 759 760 cause = (struct sctp_error_cause *)(abort + 1); 761 error = ntohs(cause->code); 762 if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) { 763 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state, ABORT flags:%x\n", 764 abort->ch.chunk_flags); 765 if (sctp_handle_nat_colliding_state(stcb)) { 766 return (0); 767 } 768 } else if (error == SCTP_CAUSE_NAT_MISSING_STATE) { 769 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state, ABORT flags:%x\n", 770 abort->ch.chunk_flags); 771 if (sctp_handle_nat_missing_state(stcb, net)) { 772 return (0); 773 } 774 } 775 } else { 776 error = 0; 777 } 778 /* stop any receive timers */ 779 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, NULL, 780 SCTP_FROM_SCTP_INPUT + SCTP_LOC_7); 781 /* notify user of the abort and clean up... */ 782 sctp_abort_notification(stcb, 1, error, abort, SCTP_SO_NOT_LOCKED); 783 /* free the tcb */ 784 SCTP_STAT_INCR_COUNTER32(sctps_aborted); 785 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) || 786 (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 787 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 788 } 789 #ifdef SCTP_ASOCLOG_OF_TSNS 790 sctp_print_out_track_log(stcb); 791 #endif 792 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 793 SCTP_FROM_SCTP_INPUT + SCTP_LOC_8); 794 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n"); 795 return (1); 796 } 797 798 static void 799 sctp_start_net_timers(struct sctp_tcb *stcb) 800 { 801 uint32_t cnt_hb_sent; 802 struct sctp_nets *net; 803 804 cnt_hb_sent = 0; 805 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 806 /* 807 * For each network start: 1) A pmtu timer. 2) A HB timer 3) 808 * If the dest in unconfirmed send a hb as well if under 809 * max_hb_burst have been sent. 810 */ 811 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net); 812 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net); 813 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) && 814 (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) { 815 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 816 cnt_hb_sent++; 817 } 818 } 819 if (cnt_hb_sent) { 820 sctp_chunk_output(stcb->sctp_ep, stcb, 821 SCTP_OUTPUT_FROM_COOKIE_ACK, 822 SCTP_SO_NOT_LOCKED); 823 } 824 } 825 826 static void 827 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp, 828 struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag) 829 { 830 struct sctp_association *asoc; 831 int some_on_streamwheel; 832 int old_state; 833 834 SCTPDBG(SCTP_DEBUG_INPUT2, 835 "sctp_handle_shutdown: handling SHUTDOWN\n"); 836 if (stcb == NULL) 837 return; 838 asoc = &stcb->asoc; 839 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || 840 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 841 return; 842 } 843 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) { 844 /* Shutdown NOT the expected size */ 845 return; 846 } 847 old_state = SCTP_GET_STATE(stcb); 848 sctp_update_acked(stcb, cp, abort_flag); 849 if (*abort_flag) { 850 return; 851 } 852 if (asoc->control_pdapi) { 853 /* 854 * With a normal shutdown we assume the end of last record. 855 */ 856 SCTP_INP_READ_LOCK(stcb->sctp_ep); 857 if (asoc->control_pdapi->on_strm_q) { 858 struct sctp_stream_in *strm; 859 860 strm = &asoc->strmin[asoc->control_pdapi->sinfo_stream]; 861 if (asoc->control_pdapi->on_strm_q == SCTP_ON_UNORDERED) { 862 /* Unordered */ 863 TAILQ_REMOVE(&strm->uno_inqueue, asoc->control_pdapi, next_instrm); 864 asoc->control_pdapi->on_strm_q = 0; 865 } else if (asoc->control_pdapi->on_strm_q == SCTP_ON_ORDERED) { 866 /* Ordered */ 867 TAILQ_REMOVE(&strm->inqueue, asoc->control_pdapi, next_instrm); 868 asoc->control_pdapi->on_strm_q = 0; 869 #ifdef INVARIANTS 870 } else { 871 panic("Unknown state on ctrl:%p on_strm_q:%d", 872 asoc->control_pdapi, 873 asoc->control_pdapi->on_strm_q); 874 #endif 875 } 876 } 877 asoc->control_pdapi->end_added = 1; 878 asoc->control_pdapi->pdapi_aborted = 1; 879 asoc->control_pdapi = NULL; 880 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 881 if (stcb->sctp_socket) { 882 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 883 } 884 } 885 /* goto SHUTDOWN_RECEIVED state to block new requests */ 886 if (stcb->sctp_socket) { 887 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) && 888 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) && 889 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT)) { 890 SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_RECEIVED); 891 /* 892 * notify upper layer that peer has initiated a 893 * shutdown 894 */ 895 sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 896 897 /* reset time */ 898 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 899 } 900 } 901 if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) { 902 /* 903 * stop the shutdown timer, since we WILL move to 904 * SHUTDOWN-ACK-SENT. 905 */ 906 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, 907 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9); 908 } 909 /* Now is there unsent data on a stream somewhere? */ 910 some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED); 911 912 if (!TAILQ_EMPTY(&asoc->send_queue) || 913 !TAILQ_EMPTY(&asoc->sent_queue) || 914 some_on_streamwheel) { 915 /* By returning we will push more data out */ 916 return; 917 } else { 918 /* no outstanding data to send, so move on... */ 919 /* send SHUTDOWN-ACK */ 920 /* move to SHUTDOWN-ACK-SENT state */ 921 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) || 922 (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 923 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 924 } 925 if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 926 SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_ACK_SENT); 927 sctp_stop_timers_for_shutdown(stcb); 928 sctp_send_shutdown_ack(stcb, net); 929 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, 930 stcb->sctp_ep, stcb, net); 931 } else if (old_state == SCTP_STATE_SHUTDOWN_ACK_SENT) { 932 sctp_send_shutdown_ack(stcb, net); 933 } 934 } 935 } 936 937 static void 938 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED, 939 struct sctp_tcb *stcb, 940 struct sctp_nets *net) 941 { 942 struct sctp_association *asoc; 943 944 SCTPDBG(SCTP_DEBUG_INPUT2, 945 "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n"); 946 if (stcb == NULL) 947 return; 948 949 asoc = &stcb->asoc; 950 /* process according to association state */ 951 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || 952 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 953 /* unexpected SHUTDOWN-ACK... do OOTB handling... */ 954 sctp_send_shutdown_complete(stcb, net, 1); 955 SCTP_TCB_UNLOCK(stcb); 956 return; 957 } 958 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) && 959 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) { 960 /* unexpected SHUTDOWN-ACK... so ignore... */ 961 SCTP_TCB_UNLOCK(stcb); 962 return; 963 } 964 if (asoc->control_pdapi) { 965 /* 966 * With a normal shutdown we assume the end of last record. 967 */ 968 SCTP_INP_READ_LOCK(stcb->sctp_ep); 969 asoc->control_pdapi->end_added = 1; 970 asoc->control_pdapi->pdapi_aborted = 1; 971 asoc->control_pdapi = NULL; 972 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 973 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 974 } 975 #ifdef INVARIANTS 976 if (!TAILQ_EMPTY(&asoc->send_queue) || 977 !TAILQ_EMPTY(&asoc->sent_queue) || 978 sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) { 979 panic("Queues are not empty when handling SHUTDOWN-ACK"); 980 } 981 #endif 982 /* stop the timer */ 983 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, 984 SCTP_FROM_SCTP_INPUT + SCTP_LOC_10); 985 /* send SHUTDOWN-COMPLETE */ 986 sctp_send_shutdown_complete(stcb, net, 0); 987 /* notify upper layer protocol */ 988 if (stcb->sctp_socket) { 989 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 990 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 991 stcb->sctp_socket->so_snd.sb_cc = 0; 992 } 993 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 994 } 995 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 996 /* free the TCB but first save off the ep */ 997 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 998 SCTP_FROM_SCTP_INPUT + SCTP_LOC_11); 999 } 1000 1001 static void 1002 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, uint8_t chunk_type) 1003 { 1004 switch (chunk_type) { 1005 case SCTP_ASCONF_ACK: 1006 case SCTP_ASCONF: 1007 sctp_asconf_cleanup(stcb); 1008 break; 1009 case SCTP_IFORWARD_CUM_TSN: 1010 case SCTP_FORWARD_CUM_TSN: 1011 stcb->asoc.prsctp_supported = 0; 1012 break; 1013 default: 1014 SCTPDBG(SCTP_DEBUG_INPUT2, 1015 "Peer does not support chunk type %d (0x%x).\n", 1016 chunk_type, chunk_type); 1017 break; 1018 } 1019 } 1020 1021 /* 1022 * Skip past the param header and then we will find the param that caused the 1023 * problem. There are a number of param's in a ASCONF OR the prsctp param 1024 * these will turn of specific features. 1025 * XXX: Is this the right thing to do? 1026 */ 1027 static void 1028 sctp_process_unrecog_param(struct sctp_tcb *stcb, uint16_t parameter_type) 1029 { 1030 switch (parameter_type) { 1031 /* pr-sctp draft */ 1032 case SCTP_PRSCTP_SUPPORTED: 1033 stcb->asoc.prsctp_supported = 0; 1034 break; 1035 case SCTP_SUPPORTED_CHUNK_EXT: 1036 break; 1037 /* draft-ietf-tsvwg-addip-sctp */ 1038 case SCTP_HAS_NAT_SUPPORT: 1039 stcb->asoc.peer_supports_nat = 0; 1040 break; 1041 case SCTP_ADD_IP_ADDRESS: 1042 case SCTP_DEL_IP_ADDRESS: 1043 case SCTP_SET_PRIM_ADDR: 1044 stcb->asoc.asconf_supported = 0; 1045 break; 1046 case SCTP_SUCCESS_REPORT: 1047 case SCTP_ERROR_CAUSE_IND: 1048 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n"); 1049 SCTPDBG(SCTP_DEBUG_INPUT2, 1050 "Turning off ASCONF to this strange peer\n"); 1051 stcb->asoc.asconf_supported = 0; 1052 break; 1053 default: 1054 SCTPDBG(SCTP_DEBUG_INPUT2, 1055 "Peer does not support param type %d (0x%x)??\n", 1056 parameter_type, parameter_type); 1057 break; 1058 } 1059 } 1060 1061 static int 1062 sctp_handle_error(struct sctp_chunkhdr *ch, 1063 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 1064 { 1065 struct sctp_error_cause *cause; 1066 struct sctp_association *asoc; 1067 uint32_t remaining_length, adjust; 1068 uint16_t code, cause_code, cause_length; 1069 1070 /* parse through all of the errors and process */ 1071 asoc = &stcb->asoc; 1072 cause = (struct sctp_error_cause *)((caddr_t)ch + 1073 sizeof(struct sctp_chunkhdr)); 1074 remaining_length = ntohs(ch->chunk_length); 1075 if (remaining_length > limit) { 1076 remaining_length = limit; 1077 } 1078 if (remaining_length >= sizeof(struct sctp_chunkhdr)) { 1079 remaining_length -= sizeof(struct sctp_chunkhdr); 1080 } else { 1081 remaining_length = 0; 1082 } 1083 code = 0; 1084 while (remaining_length >= sizeof(struct sctp_error_cause)) { 1085 /* Process an Error Cause */ 1086 cause_code = ntohs(cause->code); 1087 cause_length = ntohs(cause->length); 1088 if ((cause_length > remaining_length) || (cause_length == 0)) { 1089 /* Invalid cause length, possibly due to truncation. */ 1090 SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in cause - bytes left: %u cause length: %u\n", 1091 remaining_length, cause_length); 1092 return (0); 1093 } 1094 if (code == 0) { 1095 /* report the first error cause */ 1096 code = cause_code; 1097 } 1098 switch (cause_code) { 1099 case SCTP_CAUSE_INVALID_STREAM: 1100 case SCTP_CAUSE_MISSING_PARAM: 1101 case SCTP_CAUSE_INVALID_PARAM: 1102 case SCTP_CAUSE_NO_USER_DATA: 1103 SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %u back? We have a bug :/ (or do they?)\n", 1104 cause_code); 1105 break; 1106 case SCTP_CAUSE_NAT_COLLIDING_STATE: 1107 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state, ERROR flags: %x\n", 1108 ch->chunk_flags); 1109 if (sctp_handle_nat_colliding_state(stcb)) { 1110 return (0); 1111 } 1112 break; 1113 case SCTP_CAUSE_NAT_MISSING_STATE: 1114 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state, ERROR flags: %x\n", 1115 ch->chunk_flags); 1116 if (sctp_handle_nat_missing_state(stcb, net)) { 1117 return (0); 1118 } 1119 break; 1120 case SCTP_CAUSE_STALE_COOKIE: 1121 /* 1122 * We only act if we have echoed a cookie and are 1123 * waiting. 1124 */ 1125 if ((cause_length >= sizeof(struct sctp_error_stale_cookie)) && 1126 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 1127 struct sctp_error_stale_cookie *stale_cookie; 1128 1129 stale_cookie = (struct sctp_error_stale_cookie *)cause; 1130 /* stable_time is in usec, convert to msec. */ 1131 asoc->cookie_preserve_req = ntohl(stale_cookie->stale_time) / 1000; 1132 /* Double it to be more robust on RTX. */ 1133 asoc->cookie_preserve_req *= 2; 1134 asoc->stale_cookie_count++; 1135 if (asoc->stale_cookie_count > 1136 asoc->max_init_times) { 1137 sctp_abort_notification(stcb, 0, 0, NULL, SCTP_SO_NOT_LOCKED); 1138 /* now free the asoc */ 1139 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1140 SCTP_FROM_SCTP_INPUT + SCTP_LOC_12); 1141 return (-1); 1142 } 1143 /* blast back to INIT state */ 1144 sctp_toss_old_cookies(stcb, &stcb->asoc); 1145 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT); 1146 sctp_stop_all_cookie_timers(stcb); 1147 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 1148 } 1149 break; 1150 case SCTP_CAUSE_UNRESOLVABLE_ADDR: 1151 /* 1152 * Nothing we can do here, we don't do hostname 1153 * addresses so if the peer does not like my IPv6 1154 * (or IPv4 for that matter) it does not matter. If 1155 * they don't support that type of address, they can 1156 * NOT possibly get that packet type... i.e. with no 1157 * IPv6 you can't receive a IPv6 packet. so we can 1158 * safely ignore this one. If we ever added support 1159 * for HOSTNAME Addresses, then we would need to do 1160 * something here. 1161 */ 1162 break; 1163 case SCTP_CAUSE_UNRECOG_CHUNK: 1164 if (cause_length >= sizeof(struct sctp_error_unrecognized_chunk)) { 1165 struct sctp_error_unrecognized_chunk *unrec_chunk; 1166 1167 unrec_chunk = (struct sctp_error_unrecognized_chunk *)cause; 1168 sctp_process_unrecog_chunk(stcb, unrec_chunk->ch.chunk_type); 1169 } 1170 break; 1171 case SCTP_CAUSE_UNRECOG_PARAM: 1172 /* XXX: We only consider the first parameter */ 1173 if (cause_length >= sizeof(struct sctp_error_cause) + sizeof(struct sctp_paramhdr)) { 1174 struct sctp_paramhdr *unrec_parameter; 1175 1176 unrec_parameter = (struct sctp_paramhdr *)(cause + 1); 1177 sctp_process_unrecog_param(stcb, ntohs(unrec_parameter->param_type)); 1178 } 1179 break; 1180 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN: 1181 /* 1182 * We ignore this since the timer will drive out a 1183 * new cookie anyway and there timer will drive us 1184 * to send a SHUTDOWN_COMPLETE. We can't send one 1185 * here since we don't have their tag. 1186 */ 1187 break; 1188 case SCTP_CAUSE_DELETING_LAST_ADDR: 1189 case SCTP_CAUSE_RESOURCE_SHORTAGE: 1190 case SCTP_CAUSE_DELETING_SRC_ADDR: 1191 /* 1192 * We should NOT get these here, but in a 1193 * ASCONF-ACK. 1194 */ 1195 SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a error cause with code %u.\n", 1196 cause_code); 1197 break; 1198 case SCTP_CAUSE_OUT_OF_RESC: 1199 /* 1200 * And what, pray tell do we do with the fact that 1201 * the peer is out of resources? Not really sure we 1202 * could do anything but abort. I suspect this 1203 * should have came WITH an abort instead of in a 1204 * OP-ERROR. 1205 */ 1206 break; 1207 default: 1208 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown code 0x%x\n", 1209 cause_code); 1210 break; 1211 } 1212 adjust = SCTP_SIZE32(cause_length); 1213 if (remaining_length >= adjust) { 1214 remaining_length -= adjust; 1215 } else { 1216 remaining_length = 0; 1217 } 1218 cause = (struct sctp_error_cause *)((caddr_t)cause + adjust); 1219 } 1220 sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, code, ch, SCTP_SO_NOT_LOCKED); 1221 return (0); 1222 } 1223 1224 static int 1225 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset, 1226 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 1227 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 1228 struct sctp_nets *net, int *abort_no_unlock, 1229 uint8_t mflowtype, uint32_t mflowid, 1230 uint32_t vrf_id) 1231 { 1232 struct sctp_init_ack *init_ack; 1233 struct mbuf *op_err; 1234 1235 SCTPDBG(SCTP_DEBUG_INPUT2, 1236 "sctp_handle_init_ack: handling INIT-ACK\n"); 1237 1238 if (stcb == NULL) { 1239 SCTPDBG(SCTP_DEBUG_INPUT2, 1240 "sctp_handle_init_ack: TCB is null\n"); 1241 return (-1); 1242 } 1243 init_ack = &cp->init; 1244 /* Validate parameters. */ 1245 if ((ntohl(init_ack->initiate_tag) == 0) || 1246 (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) || 1247 (ntohs(init_ack->num_inbound_streams) == 0) || 1248 (ntohs(init_ack->num_outbound_streams) == 0)) { 1249 /* protocol error... send an abort */ 1250 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1251 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1252 src, dst, sh, op_err, 1253 mflowtype, mflowid, 1254 vrf_id, net->port); 1255 *abort_no_unlock = 1; 1256 return (-1); 1257 } 1258 /* process according to association state... */ 1259 switch (SCTP_GET_STATE(stcb)) { 1260 case SCTP_STATE_COOKIE_WAIT: 1261 /* this is the expected state for this chunk */ 1262 /* process the INIT-ACK parameters */ 1263 if (stcb->asoc.primary_destination->dest_state & 1264 SCTP_ADDR_UNCONFIRMED) { 1265 /* 1266 * The primary is where we sent the INIT, we can 1267 * always consider it confirmed when the INIT-ACK is 1268 * returned. Do this before we load addresses 1269 * though. 1270 */ 1271 stcb->asoc.primary_destination->dest_state &= 1272 ~SCTP_ADDR_UNCONFIRMED; 1273 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 1274 stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED); 1275 } 1276 if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb, 1277 net, abort_no_unlock, 1278 mflowtype, mflowid, 1279 vrf_id) < 0) { 1280 /* error in parsing parameters */ 1281 return (-1); 1282 } 1283 /* update our state */ 1284 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n"); 1285 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_ECHOED); 1286 1287 /* reset the RTO calc */ 1288 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 1289 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 1290 stcb->asoc.overall_error_count, 1291 0, 1292 SCTP_FROM_SCTP_INPUT, 1293 __LINE__); 1294 } 1295 stcb->asoc.overall_error_count = 0; 1296 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 1297 /* 1298 * collapse the init timer back in case of a exponential 1299 * backoff 1300 */ 1301 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep, 1302 stcb, net); 1303 /* 1304 * the send at the end of the inbound data processing will 1305 * cause the cookie to be sent 1306 */ 1307 break; 1308 case SCTP_STATE_SHUTDOWN_SENT: 1309 /* incorrect state... discard */ 1310 break; 1311 case SCTP_STATE_COOKIE_ECHOED: 1312 /* incorrect state... discard */ 1313 break; 1314 case SCTP_STATE_OPEN: 1315 /* incorrect state... discard */ 1316 break; 1317 case SCTP_STATE_EMPTY: 1318 case SCTP_STATE_INUSE: 1319 default: 1320 /* incorrect state... discard */ 1321 return (-1); 1322 break; 1323 } 1324 SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n"); 1325 return (0); 1326 } 1327 1328 static struct sctp_tcb * 1329 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1330 struct sockaddr *src, struct sockaddr *dst, 1331 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1332 struct sctp_inpcb *inp, struct sctp_nets **netp, 1333 struct sockaddr *init_src, int *notification, 1334 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1335 uint8_t mflowtype, uint32_t mflowid, 1336 uint32_t vrf_id, uint16_t port); 1337 1338 /* 1339 * handle a state cookie for an existing association m: input packet mbuf 1340 * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a 1341 * "split" mbuf and the cookie signature does not exist offset: offset into 1342 * mbuf to the cookie-echo chunk 1343 */ 1344 static struct sctp_tcb * 1345 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset, 1346 struct sockaddr *src, struct sockaddr *dst, 1347 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1348 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp, 1349 struct sockaddr *init_src, int *notification, 1350 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1351 uint8_t mflowtype, uint32_t mflowid, 1352 uint32_t vrf_id, uint16_t port) 1353 { 1354 struct sctp_association *asoc; 1355 struct sctp_init_chunk *init_cp, init_buf; 1356 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1357 struct sctp_asconf_addr *aparam, *naparam; 1358 struct sctp_asconf_ack *aack, *naack; 1359 struct sctp_tmit_chunk *chk, *nchk; 1360 struct sctp_stream_reset_list *strrst, *nstrrst; 1361 struct sctp_queued_to_read *sq, *nsq; 1362 struct sctp_nets *net; 1363 struct mbuf *op_err; 1364 struct timeval old; 1365 int init_offset, initack_offset, i; 1366 int retval; 1367 int spec_flag = 0; 1368 uint32_t how_indx; 1369 #if defined(SCTP_DETAILED_STR_STATS) 1370 int j; 1371 #endif 1372 1373 net = *netp; 1374 /* I know that the TCB is non-NULL from the caller */ 1375 asoc = &stcb->asoc; 1376 for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) { 1377 if (asoc->cookie_how[how_indx] == 0) 1378 break; 1379 } 1380 if (how_indx < sizeof(asoc->cookie_how)) { 1381 asoc->cookie_how[how_indx] = 1; 1382 } 1383 if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 1384 /* SHUTDOWN came in after sending INIT-ACK */ 1385 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination); 1386 op_err = sctp_generate_cause(SCTP_CAUSE_COOKIE_IN_SHUTDOWN, ""); 1387 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 1388 mflowtype, mflowid, inp->fibnum, 1389 vrf_id, net->port); 1390 if (how_indx < sizeof(asoc->cookie_how)) 1391 asoc->cookie_how[how_indx] = 2; 1392 return (NULL); 1393 } 1394 /* 1395 * find and validate the INIT chunk in the cookie (peer's info) the 1396 * INIT should start after the cookie-echo header struct (chunk 1397 * header, state cookie header struct) 1398 */ 1399 init_offset = offset += sizeof(struct sctp_cookie_echo_chunk); 1400 1401 init_cp = (struct sctp_init_chunk *) 1402 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 1403 (uint8_t *)&init_buf); 1404 if (init_cp == NULL) { 1405 /* could not pull a INIT chunk in cookie */ 1406 return (NULL); 1407 } 1408 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 1409 return (NULL); 1410 } 1411 /* 1412 * find and validate the INIT-ACK chunk in the cookie (my info) the 1413 * INIT-ACK follows the INIT chunk 1414 */ 1415 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 1416 initack_cp = (struct sctp_init_ack_chunk *) 1417 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 1418 (uint8_t *)&initack_buf); 1419 if (initack_cp == NULL) { 1420 /* could not pull INIT-ACK chunk in cookie */ 1421 return (NULL); 1422 } 1423 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 1424 return (NULL); 1425 } 1426 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1427 (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) { 1428 /* 1429 * case D in Section 5.2.4 Table 2: MMAA process accordingly 1430 * to get into the OPEN state 1431 */ 1432 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1433 /*- 1434 * Opps, this means that we somehow generated two vtag's 1435 * the same. I.e. we did: 1436 * Us Peer 1437 * <---INIT(tag=a)------ 1438 * ----INIT-ACK(tag=t)--> 1439 * ----INIT(tag=t)------> *1 1440 * <---INIT-ACK(tag=a)--- 1441 * <----CE(tag=t)------------- *2 1442 * 1443 * At point *1 we should be generating a different 1444 * tag t'. Which means we would throw away the CE and send 1445 * ours instead. Basically this is case C (throw away side). 1446 */ 1447 if (how_indx < sizeof(asoc->cookie_how)) 1448 asoc->cookie_how[how_indx] = 17; 1449 return (NULL); 1450 } 1451 switch (SCTP_GET_STATE(stcb)) { 1452 case SCTP_STATE_COOKIE_WAIT: 1453 case SCTP_STATE_COOKIE_ECHOED: 1454 /* 1455 * INIT was sent but got a COOKIE_ECHO with the 1456 * correct tags... just accept it...but we must 1457 * process the init so that we can make sure we have 1458 * the right seq no's. 1459 */ 1460 /* First we must process the INIT !! */ 1461 retval = sctp_process_init(init_cp, stcb); 1462 if (retval < 0) { 1463 if (how_indx < sizeof(asoc->cookie_how)) 1464 asoc->cookie_how[how_indx] = 3; 1465 return (NULL); 1466 } 1467 /* we have already processed the INIT so no problem */ 1468 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, 1469 stcb, net, 1470 SCTP_FROM_SCTP_INPUT + SCTP_LOC_13); 1471 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, 1472 stcb, net, 1473 SCTP_FROM_SCTP_INPUT + SCTP_LOC_14); 1474 /* update current state */ 1475 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) 1476 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1477 else 1478 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1479 1480 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 1481 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1482 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1483 stcb->sctp_ep, stcb, NULL); 1484 } 1485 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1486 sctp_stop_all_cookie_timers(stcb); 1487 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1488 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1489 (!SCTP_IS_LISTENING(inp))) { 1490 /* 1491 * Here is where collision would go if we 1492 * did a connect() and instead got a 1493 * init/init-ack/cookie done before the 1494 * init-ack came back.. 1495 */ 1496 stcb->sctp_ep->sctp_flags |= 1497 SCTP_PCB_FLAGS_CONNECTED; 1498 soisconnected(stcb->sctp_socket); 1499 } 1500 /* notify upper layer */ 1501 *notification = SCTP_NOTIFY_ASSOC_UP; 1502 /* 1503 * since we did not send a HB make sure we don't 1504 * double things 1505 */ 1506 old.tv_sec = cookie->time_entered.tv_sec; 1507 old.tv_usec = cookie->time_entered.tv_usec; 1508 net->hb_responded = 1; 1509 sctp_calculate_rto(stcb, asoc, net, &old, 1510 SCTP_RTT_FROM_NON_DATA); 1511 1512 if (stcb->asoc.sctp_autoclose_ticks && 1513 (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) { 1514 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 1515 inp, stcb, NULL); 1516 } 1517 break; 1518 default: 1519 /* 1520 * we're in the OPEN state (or beyond), so peer must 1521 * have simply lost the COOKIE-ACK 1522 */ 1523 break; 1524 } /* end switch */ 1525 sctp_stop_all_cookie_timers(stcb); 1526 /* 1527 * We ignore the return code here.. not sure if we should 1528 * somehow abort.. but we do have an existing asoc. This 1529 * really should not fail. 1530 */ 1531 if (sctp_load_addresses_from_init(stcb, m, 1532 init_offset + sizeof(struct sctp_init_chunk), 1533 initack_offset, src, dst, init_src, stcb->asoc.port)) { 1534 if (how_indx < sizeof(asoc->cookie_how)) 1535 asoc->cookie_how[how_indx] = 4; 1536 return (NULL); 1537 } 1538 /* respond with a COOKIE-ACK */ 1539 sctp_toss_old_cookies(stcb, asoc); 1540 sctp_send_cookie_ack(stcb); 1541 if (how_indx < sizeof(asoc->cookie_how)) 1542 asoc->cookie_how[how_indx] = 5; 1543 return (stcb); 1544 } 1545 1546 if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1547 ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag && 1548 cookie->tie_tag_my_vtag == 0 && 1549 cookie->tie_tag_peer_vtag == 0) { 1550 /* 1551 * case C in Section 5.2.4 Table 2: XMOO silently discard 1552 */ 1553 if (how_indx < sizeof(asoc->cookie_how)) 1554 asoc->cookie_how[how_indx] = 6; 1555 return (NULL); 1556 } 1557 /* 1558 * If nat support, and the below and stcb is established, send back 1559 * a ABORT(colliding state) if we are established. 1560 */ 1561 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) && 1562 (asoc->peer_supports_nat) && 1563 ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1564 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1565 (asoc->peer_vtag == 0)))) { 1566 /* 1567 * Special case - Peer's support nat. We may have two init's 1568 * that we gave out the same tag on since one was not 1569 * established.. i.e. we get INIT from host-1 behind the nat 1570 * and we respond tag-a, we get a INIT from host-2 behind 1571 * the nat and we get tag-a again. Then we bring up host-1 1572 * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1). 1573 * Now we have colliding state. We must send an abort here 1574 * with colliding state indication. 1575 */ 1576 op_err = sctp_generate_cause(SCTP_CAUSE_NAT_COLLIDING_STATE, ""); 1577 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err, 1578 mflowtype, mflowid, inp->fibnum, 1579 vrf_id, port); 1580 return (NULL); 1581 } 1582 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1583 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1584 (asoc->peer_vtag == 0))) { 1585 /* 1586 * case B in Section 5.2.4 Table 2: MXAA or MOAA my info 1587 * should be ok, re-accept peer info 1588 */ 1589 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1590 /* 1591 * Extension of case C. If we hit this, then the 1592 * random number generator returned the same vtag 1593 * when we first sent our INIT-ACK and when we later 1594 * sent our INIT. The side with the seq numbers that 1595 * are different will be the one that normnally 1596 * would have hit case C. This in effect "extends" 1597 * our vtags in this collision case to be 64 bits. 1598 * The same collision could occur aka you get both 1599 * vtag and seq number the same twice in a row.. but 1600 * is much less likely. If it did happen then we 1601 * would proceed through and bring up the assoc.. we 1602 * may end up with the wrong stream setup however.. 1603 * which would be bad.. but there is no way to 1604 * tell.. until we send on a stream that does not 1605 * exist :-) 1606 */ 1607 if (how_indx < sizeof(asoc->cookie_how)) 1608 asoc->cookie_how[how_indx] = 7; 1609 1610 return (NULL); 1611 } 1612 if (how_indx < sizeof(asoc->cookie_how)) 1613 asoc->cookie_how[how_indx] = 8; 1614 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, 1615 SCTP_FROM_SCTP_INPUT + SCTP_LOC_15); 1616 sctp_stop_all_cookie_timers(stcb); 1617 /* 1618 * since we did not send a HB make sure we don't double 1619 * things 1620 */ 1621 net->hb_responded = 1; 1622 if (stcb->asoc.sctp_autoclose_ticks && 1623 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 1624 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, 1625 NULL); 1626 } 1627 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1628 if (asoc->pre_open_streams < asoc->streamoutcnt) { 1629 asoc->pre_open_streams = asoc->streamoutcnt; 1630 } 1631 1632 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) { 1633 /* 1634 * Ok the peer probably discarded our data (if we 1635 * echoed a cookie+data). So anything on the 1636 * sent_queue should be marked for retransmit, we 1637 * may not get something to kick us so it COULD 1638 * still take a timeout to move these.. but it can't 1639 * hurt to mark them. 1640 */ 1641 1642 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 1643 if (chk->sent < SCTP_DATAGRAM_RESEND) { 1644 chk->sent = SCTP_DATAGRAM_RESEND; 1645 sctp_flight_size_decrease(chk); 1646 sctp_total_flight_decrease(stcb, chk); 1647 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 1648 spec_flag++; 1649 } 1650 } 1651 } 1652 /* process the INIT info (peer's info) */ 1653 retval = sctp_process_init(init_cp, stcb); 1654 if (retval < 0) { 1655 if (how_indx < sizeof(asoc->cookie_how)) 1656 asoc->cookie_how[how_indx] = 9; 1657 return (NULL); 1658 } 1659 if (sctp_load_addresses_from_init(stcb, m, 1660 init_offset + sizeof(struct sctp_init_chunk), 1661 initack_offset, src, dst, init_src, stcb->asoc.port)) { 1662 if (how_indx < sizeof(asoc->cookie_how)) 1663 asoc->cookie_how[how_indx] = 10; 1664 return (NULL); 1665 } 1666 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || 1667 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 1668 *notification = SCTP_NOTIFY_ASSOC_UP; 1669 1670 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1671 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1672 (!SCTP_IS_LISTENING(inp))) { 1673 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 1674 soisconnected(stcb->sctp_socket); 1675 } 1676 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) 1677 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1678 else 1679 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1680 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1681 } else if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) { 1682 SCTP_STAT_INCR_COUNTER32(sctps_restartestab); 1683 } else { 1684 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1685 } 1686 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 1687 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1688 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1689 stcb->sctp_ep, stcb, NULL); 1690 } 1691 sctp_stop_all_cookie_timers(stcb); 1692 sctp_toss_old_cookies(stcb, asoc); 1693 sctp_send_cookie_ack(stcb); 1694 if (spec_flag) { 1695 /* 1696 * only if we have retrans set do we do this. What 1697 * this call does is get only the COOKIE-ACK out and 1698 * then when we return the normal call to 1699 * sctp_chunk_output will get the retrans out behind 1700 * this. 1701 */ 1702 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED); 1703 } 1704 if (how_indx < sizeof(asoc->cookie_how)) 1705 asoc->cookie_how[how_indx] = 11; 1706 1707 return (stcb); 1708 } 1709 if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1710 ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) && 1711 cookie->tie_tag_my_vtag == asoc->my_vtag_nonce && 1712 cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce && 1713 cookie->tie_tag_peer_vtag != 0) { 1714 struct sctpasochead *head; 1715 1716 if (asoc->peer_supports_nat) { 1717 /* 1718 * This is a gross gross hack. Just call the 1719 * cookie_new code since we are allowing a duplicate 1720 * association. I hope this works... 1721 */ 1722 return (sctp_process_cookie_new(m, iphlen, offset, src, dst, 1723 sh, cookie, cookie_len, 1724 inp, netp, init_src, notification, 1725 auth_skipped, auth_offset, auth_len, 1726 mflowtype, mflowid, 1727 vrf_id, port)); 1728 } 1729 /* 1730 * case A in Section 5.2.4 Table 2: XXMM (peer restarted) 1731 */ 1732 /* temp code */ 1733 if (how_indx < sizeof(asoc->cookie_how)) 1734 asoc->cookie_how[how_indx] = 12; 1735 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, 1736 SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 1737 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, 1738 SCTP_FROM_SCTP_INPUT + SCTP_LOC_17); 1739 1740 /* notify upper layer */ 1741 *notification = SCTP_NOTIFY_ASSOC_RESTART; 1742 atomic_add_int(&stcb->asoc.refcnt, 1); 1743 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_OPEN) && 1744 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) && 1745 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT)) { 1746 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1747 } 1748 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) { 1749 SCTP_STAT_INCR_GAUGE32(sctps_restartestab); 1750 } else if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) { 1751 SCTP_STAT_INCR_GAUGE32(sctps_collisionestab); 1752 } 1753 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1754 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 1755 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1756 stcb->sctp_ep, stcb, NULL); 1757 1758 } else if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) { 1759 /* move to OPEN state, if not in SHUTDOWN_SENT */ 1760 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 1761 } 1762 if (asoc->pre_open_streams < asoc->streamoutcnt) { 1763 asoc->pre_open_streams = asoc->streamoutcnt; 1764 } 1765 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 1766 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 1767 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 1768 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 1769 asoc->str_reset_seq_in = asoc->init_seq_number; 1770 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 1771 asoc->send_sack = 1; 1772 if (asoc->mapping_array) { 1773 memset(asoc->mapping_array, 0, 1774 asoc->mapping_array_size); 1775 } 1776 if (asoc->nr_mapping_array) { 1777 memset(asoc->nr_mapping_array, 0, 1778 asoc->mapping_array_size); 1779 } 1780 SCTP_TCB_UNLOCK(stcb); 1781 SCTP_INP_INFO_WLOCK(); 1782 SCTP_INP_WLOCK(stcb->sctp_ep); 1783 SCTP_TCB_LOCK(stcb); 1784 atomic_add_int(&stcb->asoc.refcnt, -1); 1785 /* send up all the data */ 1786 SCTP_TCB_SEND_LOCK(stcb); 1787 1788 sctp_report_all_outbound(stcb, 0, SCTP_SO_LOCKED); 1789 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 1790 stcb->asoc.strmout[i].chunks_on_queues = 0; 1791 #if defined(SCTP_DETAILED_STR_STATS) 1792 for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) { 1793 asoc->strmout[i].abandoned_sent[j] = 0; 1794 asoc->strmout[i].abandoned_unsent[j] = 0; 1795 } 1796 #else 1797 asoc->strmout[i].abandoned_sent[0] = 0; 1798 asoc->strmout[i].abandoned_unsent[0] = 0; 1799 #endif 1800 stcb->asoc.strmout[i].next_mid_ordered = 0; 1801 stcb->asoc.strmout[i].next_mid_unordered = 0; 1802 stcb->asoc.strmout[i].sid = i; 1803 stcb->asoc.strmout[i].last_msg_incomplete = 0; 1804 } 1805 TAILQ_FOREACH_SAFE(strrst, &asoc->resetHead, next_resp, nstrrst) { 1806 TAILQ_REMOVE(&asoc->resetHead, strrst, next_resp); 1807 SCTP_FREE(strrst, SCTP_M_STRESET); 1808 } 1809 TAILQ_FOREACH_SAFE(sq, &asoc->pending_reply_queue, next, nsq) { 1810 TAILQ_REMOVE(&asoc->pending_reply_queue, sq, next); 1811 if (sq->data) { 1812 sctp_m_freem(sq->data); 1813 sq->data = NULL; 1814 } 1815 sctp_free_remote_addr(sq->whoFrom); 1816 sq->whoFrom = NULL; 1817 sq->stcb = NULL; 1818 sctp_free_a_readq(stcb, sq); 1819 } 1820 TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) { 1821 TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next); 1822 if (chk->data) { 1823 sctp_m_freem(chk->data); 1824 chk->data = NULL; 1825 } 1826 if (chk->holds_key_ref) 1827 sctp_auth_key_release(stcb, chk->auth_keyid, SCTP_SO_LOCKED); 1828 sctp_free_remote_addr(chk->whoTo); 1829 SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_chunk), chk); 1830 SCTP_DECR_CHK_COUNT(); 1831 } 1832 TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) { 1833 TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next); 1834 if (chk->data) { 1835 sctp_m_freem(chk->data); 1836 chk->data = NULL; 1837 } 1838 if (chk->holds_key_ref) 1839 sctp_auth_key_release(stcb, chk->auth_keyid, SCTP_SO_LOCKED); 1840 sctp_free_remote_addr(chk->whoTo); 1841 SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_chunk), chk); 1842 SCTP_DECR_CHK_COUNT(); 1843 } 1844 TAILQ_FOREACH_SAFE(aparam, &asoc->asconf_queue, next, naparam) { 1845 TAILQ_REMOVE(&asoc->asconf_queue, aparam, next); 1846 SCTP_FREE(aparam, SCTP_M_ASC_ADDR); 1847 } 1848 TAILQ_FOREACH_SAFE(aack, &asoc->asconf_ack_sent, next, naack) { 1849 TAILQ_REMOVE(&asoc->asconf_ack_sent, aack, next); 1850 if (aack->data != NULL) { 1851 sctp_m_freem(aack->data); 1852 } 1853 SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_asconf_ack), aack); 1854 } 1855 1856 /* process the INIT-ACK info (my info) */ 1857 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 1858 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1859 1860 /* pull from vtag hash */ 1861 LIST_REMOVE(stcb, sctp_asocs); 1862 /* re-insert to new vtag position */ 1863 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, 1864 SCTP_BASE_INFO(hashasocmark))]; 1865 /* 1866 * put it in the bucket in the vtag hash of assoc's for the 1867 * system 1868 */ 1869 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 1870 1871 SCTP_TCB_SEND_UNLOCK(stcb); 1872 SCTP_INP_WUNLOCK(stcb->sctp_ep); 1873 SCTP_INP_INFO_WUNLOCK(); 1874 asoc->total_flight = 0; 1875 asoc->total_flight_count = 0; 1876 /* process the INIT info (peer's info) */ 1877 retval = sctp_process_init(init_cp, stcb); 1878 if (retval < 0) { 1879 if (how_indx < sizeof(asoc->cookie_how)) 1880 asoc->cookie_how[how_indx] = 13; 1881 1882 return (NULL); 1883 } 1884 /* 1885 * since we did not send a HB make sure we don't double 1886 * things 1887 */ 1888 net->hb_responded = 1; 1889 1890 if (sctp_load_addresses_from_init(stcb, m, 1891 init_offset + sizeof(struct sctp_init_chunk), 1892 initack_offset, src, dst, init_src, stcb->asoc.port)) { 1893 if (how_indx < sizeof(asoc->cookie_how)) 1894 asoc->cookie_how[how_indx] = 14; 1895 1896 return (NULL); 1897 } 1898 /* respond with a COOKIE-ACK */ 1899 sctp_stop_all_cookie_timers(stcb); 1900 sctp_toss_old_cookies(stcb, asoc); 1901 sctp_send_cookie_ack(stcb); 1902 if (how_indx < sizeof(asoc->cookie_how)) 1903 asoc->cookie_how[how_indx] = 15; 1904 1905 return (stcb); 1906 } 1907 if (how_indx < sizeof(asoc->cookie_how)) 1908 asoc->cookie_how[how_indx] = 16; 1909 /* all other cases... */ 1910 return (NULL); 1911 } 1912 1913 /* 1914 * handle a state cookie for a new association m: input packet mbuf chain-- 1915 * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf 1916 * and the cookie signature does not exist offset: offset into mbuf to the 1917 * cookie-echo chunk length: length of the cookie chunk to: where the init 1918 * was from returns a new TCB 1919 */ 1920 static struct sctp_tcb * 1921 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1922 struct sockaddr *src, struct sockaddr *dst, 1923 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1924 struct sctp_inpcb *inp, struct sctp_nets **netp, 1925 struct sockaddr *init_src, int *notification, 1926 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1927 uint8_t mflowtype, uint32_t mflowid, 1928 uint32_t vrf_id, uint16_t port) 1929 { 1930 struct sctp_tcb *stcb; 1931 struct sctp_init_chunk *init_cp, init_buf; 1932 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1933 union sctp_sockstore store; 1934 struct sctp_association *asoc; 1935 int init_offset, initack_offset, initack_limit; 1936 int retval; 1937 int error = 0; 1938 uint8_t auth_chunk_buf[SCTP_CHUNK_BUFFER_SIZE]; 1939 1940 /* 1941 * find and validate the INIT chunk in the cookie (peer's info) the 1942 * INIT should start after the cookie-echo header struct (chunk 1943 * header, state cookie header struct) 1944 */ 1945 init_offset = offset + sizeof(struct sctp_cookie_echo_chunk); 1946 init_cp = (struct sctp_init_chunk *) 1947 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 1948 (uint8_t *)&init_buf); 1949 if (init_cp == NULL) { 1950 /* could not pull a INIT chunk in cookie */ 1951 SCTPDBG(SCTP_DEBUG_INPUT1, 1952 "process_cookie_new: could not pull INIT chunk hdr\n"); 1953 return (NULL); 1954 } 1955 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 1956 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n"); 1957 return (NULL); 1958 } 1959 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 1960 /* 1961 * find and validate the INIT-ACK chunk in the cookie (my info) the 1962 * INIT-ACK follows the INIT chunk 1963 */ 1964 initack_cp = (struct sctp_init_ack_chunk *) 1965 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 1966 (uint8_t *)&initack_buf); 1967 if (initack_cp == NULL) { 1968 /* could not pull INIT-ACK chunk in cookie */ 1969 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n"); 1970 return (NULL); 1971 } 1972 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 1973 return (NULL); 1974 } 1975 /* 1976 * NOTE: We can't use the INIT_ACK's chk_length to determine the 1977 * "initack_limit" value. This is because the chk_length field 1978 * includes the length of the cookie, but the cookie is omitted when 1979 * the INIT and INIT_ACK are tacked onto the cookie... 1980 */ 1981 initack_limit = offset + cookie_len; 1982 1983 /* 1984 * now that we know the INIT/INIT-ACK are in place, create a new TCB 1985 * and popluate 1986 */ 1987 1988 /* 1989 * Here we do a trick, we set in NULL for the proc/thread argument. 1990 * We do this since in effect we only use the p argument when the 1991 * socket is unbound and we must do an implicit bind. Since we are 1992 * getting a cookie, we cannot be unbound. 1993 */ 1994 stcb = sctp_aloc_assoc(inp, init_src, &error, 1995 ntohl(initack_cp->init.initiate_tag), vrf_id, 1996 ntohs(initack_cp->init.num_outbound_streams), 1997 port, 1998 (struct thread *)NULL, 1999 SCTP_DONT_INITIALIZE_AUTH_PARAMS); 2000 if (stcb == NULL) { 2001 struct mbuf *op_err; 2002 2003 /* memory problem? */ 2004 SCTPDBG(SCTP_DEBUG_INPUT1, 2005 "process_cookie_new: no room for another TCB!\n"); 2006 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2007 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2008 src, dst, sh, op_err, 2009 mflowtype, mflowid, 2010 vrf_id, port); 2011 return (NULL); 2012 } 2013 asoc = &stcb->asoc; 2014 /* get scope variables out of cookie */ 2015 asoc->scope.ipv4_local_scope = cookie->ipv4_scope; 2016 asoc->scope.site_scope = cookie->site_scope; 2017 asoc->scope.local_scope = cookie->local_scope; 2018 asoc->scope.loopback_scope = cookie->loopback_scope; 2019 2020 if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) || 2021 (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) { 2022 struct mbuf *op_err; 2023 2024 /* 2025 * Houston we have a problem. The EP changed while the 2026 * cookie was in flight. Only recourse is to abort the 2027 * association. 2028 */ 2029 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2030 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2031 src, dst, sh, op_err, 2032 mflowtype, mflowid, 2033 vrf_id, port); 2034 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2035 SCTP_FROM_SCTP_INPUT + SCTP_LOC_18); 2036 return (NULL); 2037 } 2038 /* process the INIT-ACK info (my info) */ 2039 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 2040 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 2041 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 2042 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 2043 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 2044 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 2045 asoc->str_reset_seq_in = asoc->init_seq_number; 2046 2047 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 2048 2049 /* process the INIT info (peer's info) */ 2050 retval = sctp_process_init(init_cp, stcb); 2051 if (retval < 0) { 2052 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2053 SCTP_FROM_SCTP_INPUT + SCTP_LOC_19); 2054 return (NULL); 2055 } 2056 /* load all addresses */ 2057 if (sctp_load_addresses_from_init(stcb, m, 2058 init_offset + sizeof(struct sctp_init_chunk), initack_offset, 2059 src, dst, init_src, port)) { 2060 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2061 SCTP_FROM_SCTP_INPUT + SCTP_LOC_20); 2062 return (NULL); 2063 } 2064 /* 2065 * verify any preceding AUTH chunk that was skipped 2066 */ 2067 /* pull the local authentication parameters from the cookie/init-ack */ 2068 sctp_auth_get_cookie_params(stcb, m, 2069 initack_offset + sizeof(struct sctp_init_ack_chunk), 2070 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk))); 2071 if (auth_skipped) { 2072 struct sctp_auth_chunk *auth; 2073 2074 if (auth_len <= SCTP_CHUNK_BUFFER_SIZE) { 2075 auth = (struct sctp_auth_chunk *)sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf); 2076 } else { 2077 auth = NULL; 2078 } 2079 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) { 2080 /* auth HMAC failed, dump the assoc and packet */ 2081 SCTPDBG(SCTP_DEBUG_AUTH1, 2082 "COOKIE-ECHO: AUTH failed\n"); 2083 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2084 SCTP_FROM_SCTP_INPUT + SCTP_LOC_21); 2085 return (NULL); 2086 } else { 2087 /* remaining chunks checked... good to go */ 2088 stcb->asoc.authenticated = 1; 2089 } 2090 } 2091 2092 /* 2093 * if we're doing ASCONFs, check to see if we have any new local 2094 * addresses that need to get added to the peer (eg. addresses 2095 * changed while cookie echo in flight). This needs to be done 2096 * after we go to the OPEN state to do the correct asconf 2097 * processing. else, make sure we have the correct addresses in our 2098 * lists 2099 */ 2100 2101 /* warning, we re-use sin, sin6, sa_store here! */ 2102 /* pull in local_address (our "from" address) */ 2103 switch (cookie->laddr_type) { 2104 #ifdef INET 2105 case SCTP_IPV4_ADDRESS: 2106 /* source addr is IPv4 */ 2107 memset(&store.sin, 0, sizeof(struct sockaddr_in)); 2108 store.sin.sin_family = AF_INET; 2109 store.sin.sin_len = sizeof(struct sockaddr_in); 2110 store.sin.sin_addr.s_addr = cookie->laddress[0]; 2111 break; 2112 #endif 2113 #ifdef INET6 2114 case SCTP_IPV6_ADDRESS: 2115 /* source addr is IPv6 */ 2116 memset(&store.sin6, 0, sizeof(struct sockaddr_in6)); 2117 store.sin6.sin6_family = AF_INET6; 2118 store.sin6.sin6_len = sizeof(struct sockaddr_in6); 2119 store.sin6.sin6_scope_id = cookie->scope_id; 2120 memcpy(&store.sin6.sin6_addr, cookie->laddress, sizeof(struct in6_addr)); 2121 break; 2122 #endif 2123 default: 2124 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2125 SCTP_FROM_SCTP_INPUT + SCTP_LOC_22); 2126 return (NULL); 2127 } 2128 2129 /* update current state */ 2130 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2131 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 2132 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2133 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2134 stcb->sctp_ep, stcb, NULL); 2135 } 2136 sctp_stop_all_cookie_timers(stcb); 2137 SCTP_STAT_INCR_COUNTER32(sctps_passiveestab); 2138 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2139 2140 /* set up to notify upper layer */ 2141 *notification = SCTP_NOTIFY_ASSOC_UP; 2142 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2143 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 2144 (!SCTP_IS_LISTENING(inp))) { 2145 /* 2146 * This is an endpoint that called connect() how it got a 2147 * cookie that is NEW is a bit of a mystery. It must be that 2148 * the INIT was sent, but before it got there.. a complete 2149 * INIT/INIT-ACK/COOKIE arrived. But of course then it 2150 * should have went to the other code.. not here.. oh well.. 2151 * a bit of protection is worth having.. 2152 */ 2153 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2154 soisconnected(stcb->sctp_socket); 2155 } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 2156 (SCTP_IS_LISTENING(inp))) { 2157 /* 2158 * We don't want to do anything with this one. Since it is 2159 * the listening guy. The timer will get started for 2160 * accepted connections in the caller. 2161 */ 2162 ; 2163 } 2164 if (stcb->asoc.sctp_autoclose_ticks && 2165 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2166 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL); 2167 } 2168 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 2169 *netp = sctp_findnet(stcb, init_src); 2170 if (*netp != NULL) { 2171 struct timeval old; 2172 2173 /* 2174 * Since we did not send a HB, make sure we don't double 2175 * things. 2176 */ 2177 (*netp)->hb_responded = 1; 2178 /* Calculate the RTT. */ 2179 old.tv_sec = cookie->time_entered.tv_sec; 2180 old.tv_usec = cookie->time_entered.tv_usec; 2181 sctp_calculate_rto(stcb, asoc, *netp, &old, SCTP_RTT_FROM_NON_DATA); 2182 } 2183 /* respond with a COOKIE-ACK */ 2184 sctp_send_cookie_ack(stcb); 2185 2186 /* 2187 * check the address lists for any ASCONFs that need to be sent 2188 * AFTER the cookie-ack is sent 2189 */ 2190 sctp_check_address_list(stcb, m, 2191 initack_offset + sizeof(struct sctp_init_ack_chunk), 2192 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)), 2193 &store.sa, cookie->local_scope, cookie->site_scope, 2194 cookie->ipv4_scope, cookie->loopback_scope); 2195 2196 return (stcb); 2197 } 2198 2199 /* 2200 * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e 2201 * we NEED to make sure we are not already using the vtag. If so we 2202 * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit! 2203 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag, 2204 SCTP_BASE_INFO(hashasocmark))]; 2205 LIST_FOREACH(stcb, head, sctp_asocs) { 2206 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep)) { 2207 -- SEND ABORT - TRY AGAIN -- 2208 } 2209 } 2210 */ 2211 2212 /* 2213 * handles a COOKIE-ECHO message stcb: modified to either a new or left as 2214 * existing (non-NULL) TCB 2215 */ 2216 static struct mbuf * 2217 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset, 2218 struct sockaddr *src, struct sockaddr *dst, 2219 struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp, 2220 struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp, 2221 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2222 struct sctp_tcb **locked_tcb, 2223 uint8_t mflowtype, uint32_t mflowid, 2224 uint32_t vrf_id, uint16_t port) 2225 { 2226 struct sctp_state_cookie *cookie; 2227 struct sctp_tcb *l_stcb = *stcb; 2228 struct sctp_inpcb *l_inp; 2229 struct sockaddr *to; 2230 struct sctp_pcb *ep; 2231 struct mbuf *m_sig; 2232 uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE]; 2233 uint8_t *sig; 2234 uint8_t cookie_ok = 0; 2235 unsigned int sig_offset, cookie_offset; 2236 unsigned int cookie_len; 2237 struct timeval now; 2238 struct timeval time_entered, time_expires; 2239 int notification = 0; 2240 struct sctp_nets *netl; 2241 int had_a_existing_tcb = 0; 2242 int send_int_conf = 0; 2243 #ifdef INET 2244 struct sockaddr_in sin; 2245 #endif 2246 #ifdef INET6 2247 struct sockaddr_in6 sin6; 2248 #endif 2249 2250 SCTPDBG(SCTP_DEBUG_INPUT2, 2251 "sctp_handle_cookie: handling COOKIE-ECHO\n"); 2252 2253 if (inp_p == NULL) { 2254 return (NULL); 2255 } 2256 cookie = &cp->cookie; 2257 cookie_offset = offset + sizeof(struct sctp_chunkhdr); 2258 cookie_len = ntohs(cp->ch.chunk_length); 2259 2260 if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) + 2261 sizeof(struct sctp_init_chunk) + 2262 sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) { 2263 /* cookie too small */ 2264 return (NULL); 2265 } 2266 if ((cookie->peerport != sh->src_port) || 2267 (cookie->myport != sh->dest_port) || 2268 (cookie->my_vtag != sh->v_tag)) { 2269 /* 2270 * invalid ports or bad tag. Note that we always leave the 2271 * v_tag in the header in network order and when we stored 2272 * it in the my_vtag slot we also left it in network order. 2273 * This maintains the match even though it may be in the 2274 * opposite byte order of the machine :-> 2275 */ 2276 return (NULL); 2277 } 2278 /* 2279 * split off the signature into its own mbuf (since it should not be 2280 * calculated in the sctp_hmac_m() call). 2281 */ 2282 sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE; 2283 m_sig = m_split(m, sig_offset, M_NOWAIT); 2284 if (m_sig == NULL) { 2285 /* out of memory or ?? */ 2286 return (NULL); 2287 } 2288 #ifdef SCTP_MBUF_LOGGING 2289 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 2290 sctp_log_mbc(m_sig, SCTP_MBUF_SPLIT); 2291 } 2292 #endif 2293 2294 /* 2295 * compute the signature/digest for the cookie 2296 */ 2297 ep = &(*inp_p)->sctp_ep; 2298 l_inp = *inp_p; 2299 if (l_stcb) { 2300 SCTP_TCB_UNLOCK(l_stcb); 2301 } 2302 SCTP_INP_RLOCK(l_inp); 2303 if (l_stcb) { 2304 SCTP_TCB_LOCK(l_stcb); 2305 } 2306 /* which cookie is it? */ 2307 if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) && 2308 (ep->current_secret_number != ep->last_secret_number)) { 2309 /* it's the old cookie */ 2310 (void)sctp_hmac_m(SCTP_HMAC, 2311 (uint8_t *)ep->secret_key[(int)ep->last_secret_number], 2312 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2313 } else { 2314 /* it's the current cookie */ 2315 (void)sctp_hmac_m(SCTP_HMAC, 2316 (uint8_t *)ep->secret_key[(int)ep->current_secret_number], 2317 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2318 } 2319 /* get the signature */ 2320 SCTP_INP_RUNLOCK(l_inp); 2321 sig = (uint8_t *)sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *)&tmp_sig); 2322 if (sig == NULL) { 2323 /* couldn't find signature */ 2324 sctp_m_freem(m_sig); 2325 return (NULL); 2326 } 2327 /* compare the received digest with the computed digest */ 2328 if (timingsafe_bcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) { 2329 /* try the old cookie? */ 2330 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) && 2331 (ep->current_secret_number != ep->last_secret_number)) { 2332 /* compute digest with old */ 2333 (void)sctp_hmac_m(SCTP_HMAC, 2334 (uint8_t *)ep->secret_key[(int)ep->last_secret_number], 2335 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2336 /* compare */ 2337 if (timingsafe_bcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0) 2338 cookie_ok = 1; 2339 } 2340 } else { 2341 cookie_ok = 1; 2342 } 2343 2344 /* 2345 * Now before we continue we must reconstruct our mbuf so that 2346 * normal processing of any other chunks will work. 2347 */ 2348 { 2349 struct mbuf *m_at; 2350 2351 m_at = m; 2352 while (SCTP_BUF_NEXT(m_at) != NULL) { 2353 m_at = SCTP_BUF_NEXT(m_at); 2354 } 2355 SCTP_BUF_NEXT(m_at) = m_sig; 2356 } 2357 2358 if (cookie_ok == 0) { 2359 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n"); 2360 SCTPDBG(SCTP_DEBUG_INPUT2, 2361 "offset = %u, cookie_offset = %u, sig_offset = %u\n", 2362 (uint32_t)offset, cookie_offset, sig_offset); 2363 return (NULL); 2364 } 2365 2366 if (sctp_ticks_to_msecs(cookie->cookie_life) > SCTP_MAX_COOKIE_LIFE) { 2367 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: Invalid cookie lifetime\n"); 2368 return (NULL); 2369 } 2370 time_entered.tv_sec = cookie->time_entered.tv_sec; 2371 time_entered.tv_usec = cookie->time_entered.tv_usec; 2372 if ((time_entered.tv_sec < 0) || 2373 (time_entered.tv_usec < 0) || 2374 (time_entered.tv_usec >= 1000000)) { 2375 /* Invalid time stamp. Cookie must have been modified. */ 2376 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: Invalid time stamp\n"); 2377 return (NULL); 2378 } 2379 (void)SCTP_GETTIME_TIMEVAL(&now); 2380 if (timevalcmp(&now, &time_entered, <)) { 2381 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie generated in the future!\n"); 2382 return (NULL); 2383 } 2384 /* 2385 * Check the cookie timestamps to be sure it's not stale. 2386 * cookie_life is in ticks, so we convert to seconds. 2387 */ 2388 time_expires.tv_sec = time_entered.tv_sec + sctp_ticks_to_secs(cookie->cookie_life); 2389 time_expires.tv_usec = time_entered.tv_usec; 2390 if (timevalcmp(&now, &time_expires, >)) { 2391 /* cookie is stale! */ 2392 struct mbuf *op_err; 2393 struct sctp_error_stale_cookie *cause; 2394 struct timeval diff; 2395 uint32_t staleness; 2396 2397 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_error_stale_cookie), 2398 0, M_NOWAIT, 1, MT_DATA); 2399 if (op_err == NULL) { 2400 /* FOOBAR */ 2401 return (NULL); 2402 } 2403 /* Set the len */ 2404 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_error_stale_cookie); 2405 cause = mtod(op_err, struct sctp_error_stale_cookie *); 2406 cause->cause.code = htons(SCTP_CAUSE_STALE_COOKIE); 2407 cause->cause.length = htons(sizeof(struct sctp_error_stale_cookie)); 2408 diff = now; 2409 timevalsub(&diff, &time_expires); 2410 if ((uint32_t)diff.tv_sec > UINT32_MAX / 1000000) { 2411 staleness = UINT32_MAX; 2412 } else { 2413 staleness = diff.tv_sec * 1000000; 2414 } 2415 if (UINT32_MAX - staleness >= (uint32_t)diff.tv_usec) { 2416 staleness += diff.tv_usec; 2417 } else { 2418 staleness = UINT32_MAX; 2419 } 2420 cause->stale_time = htonl(staleness); 2421 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 2422 mflowtype, mflowid, l_inp->fibnum, 2423 vrf_id, port); 2424 return (NULL); 2425 } 2426 /* 2427 * Now we must see with the lookup address if we have an existing 2428 * asoc. This will only happen if we were in the COOKIE-WAIT state 2429 * and a INIT collided with us and somewhere the peer sent the 2430 * cookie on another address besides the single address our assoc 2431 * had for him. In this case we will have one of the tie-tags set at 2432 * least AND the address field in the cookie can be used to look it 2433 * up. 2434 */ 2435 to = NULL; 2436 switch (cookie->addr_type) { 2437 #ifdef INET6 2438 case SCTP_IPV6_ADDRESS: 2439 memset(&sin6, 0, sizeof(sin6)); 2440 sin6.sin6_family = AF_INET6; 2441 sin6.sin6_len = sizeof(sin6); 2442 sin6.sin6_port = sh->src_port; 2443 sin6.sin6_scope_id = cookie->scope_id; 2444 memcpy(&sin6.sin6_addr.s6_addr, cookie->address, 2445 sizeof(sin6.sin6_addr.s6_addr)); 2446 to = (struct sockaddr *)&sin6; 2447 break; 2448 #endif 2449 #ifdef INET 2450 case SCTP_IPV4_ADDRESS: 2451 memset(&sin, 0, sizeof(sin)); 2452 sin.sin_family = AF_INET; 2453 sin.sin_len = sizeof(sin); 2454 sin.sin_port = sh->src_port; 2455 sin.sin_addr.s_addr = cookie->address[0]; 2456 to = (struct sockaddr *)&sin; 2457 break; 2458 #endif 2459 default: 2460 /* This should not happen */ 2461 return (NULL); 2462 } 2463 if (*stcb == NULL) { 2464 /* Yep, lets check */ 2465 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL); 2466 if (*stcb == NULL) { 2467 /* 2468 * We should have only got back the same inp. If we 2469 * got back a different ep we have a problem. The 2470 * original findep got back l_inp and now 2471 */ 2472 if (l_inp != *inp_p) { 2473 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n"); 2474 } 2475 } else { 2476 if (*locked_tcb == NULL) { 2477 /* 2478 * In this case we found the assoc only 2479 * after we locked the create lock. This 2480 * means we are in a colliding case and we 2481 * must make sure that we unlock the tcb if 2482 * its one of the cases where we throw away 2483 * the incoming packets. 2484 */ 2485 *locked_tcb = *stcb; 2486 2487 /* 2488 * We must also increment the inp ref count 2489 * since the ref_count flags was set when we 2490 * did not find the TCB, now we found it 2491 * which reduces the refcount.. we must 2492 * raise it back out to balance it all :-) 2493 */ 2494 SCTP_INP_INCR_REF((*stcb)->sctp_ep); 2495 if ((*stcb)->sctp_ep != l_inp) { 2496 SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n", 2497 (void *)(*stcb)->sctp_ep, (void *)l_inp); 2498 } 2499 } 2500 } 2501 } 2502 2503 cookie_len -= SCTP_SIGNATURE_SIZE; 2504 if (*stcb == NULL) { 2505 /* this is the "normal" case... get a new TCB */ 2506 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh, 2507 cookie, cookie_len, *inp_p, 2508 netp, to, ¬ification, 2509 auth_skipped, auth_offset, auth_len, 2510 mflowtype, mflowid, 2511 vrf_id, port); 2512 } else { 2513 /* this is abnormal... cookie-echo on existing TCB */ 2514 had_a_existing_tcb = 1; 2515 *stcb = sctp_process_cookie_existing(m, iphlen, offset, 2516 src, dst, sh, 2517 cookie, cookie_len, *inp_p, *stcb, netp, to, 2518 ¬ification, auth_skipped, auth_offset, auth_len, 2519 mflowtype, mflowid, 2520 vrf_id, port); 2521 } 2522 2523 if (*stcb == NULL) { 2524 /* still no TCB... must be bad cookie-echo */ 2525 return (NULL); 2526 } 2527 if (*netp != NULL) { 2528 (*netp)->flowtype = mflowtype; 2529 (*netp)->flowid = mflowid; 2530 } 2531 /* 2532 * Ok, we built an association so confirm the address we sent the 2533 * INIT-ACK to. 2534 */ 2535 netl = sctp_findnet(*stcb, to); 2536 /* 2537 * This code should in theory NOT run but 2538 */ 2539 if (netl == NULL) { 2540 /* TSNH! Huh, why do I need to add this address here? */ 2541 if (sctp_add_remote_addr(*stcb, to, NULL, port, 2542 SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) { 2543 return (NULL); 2544 } 2545 netl = sctp_findnet(*stcb, to); 2546 } 2547 if (netl) { 2548 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) { 2549 netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 2550 (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL, 2551 netl); 2552 send_int_conf = 1; 2553 } 2554 } 2555 sctp_start_net_timers(*stcb); 2556 if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) { 2557 if (!had_a_existing_tcb || 2558 (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) { 2559 /* 2560 * If we have a NEW cookie or the connect never 2561 * reached the connected state during collision we 2562 * must do the TCP accept thing. 2563 */ 2564 struct socket *so, *oso; 2565 struct sctp_inpcb *inp; 2566 2567 if (notification == SCTP_NOTIFY_ASSOC_RESTART) { 2568 /* 2569 * For a restart we will keep the same 2570 * socket, no need to do anything. I THINK!! 2571 */ 2572 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2573 if (send_int_conf) { 2574 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2575 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2576 } 2577 return (m); 2578 } 2579 oso = (*inp_p)->sctp_socket; 2580 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2581 SCTP_TCB_UNLOCK((*stcb)); 2582 CURVNET_SET(oso->so_vnet); 2583 so = sonewconn(oso, 0 2584 ); 2585 CURVNET_RESTORE(); 2586 SCTP_TCB_LOCK((*stcb)); 2587 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2588 2589 if (so == NULL) { 2590 struct mbuf *op_err; 2591 2592 /* Too many sockets */ 2593 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n"); 2594 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2595 sctp_abort_association(*inp_p, NULL, m, iphlen, 2596 src, dst, sh, op_err, 2597 mflowtype, mflowid, 2598 vrf_id, port); 2599 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, 2600 SCTP_FROM_SCTP_INPUT + SCTP_LOC_23); 2601 return (NULL); 2602 } 2603 inp = (struct sctp_inpcb *)so->so_pcb; 2604 SCTP_INP_INCR_REF(inp); 2605 /* 2606 * We add the unbound flag here so that if we get an 2607 * soabort() before we get the move_pcb done, we 2608 * will properly cleanup. 2609 */ 2610 inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE | 2611 SCTP_PCB_FLAGS_CONNECTED | 2612 SCTP_PCB_FLAGS_IN_TCPPOOL | 2613 SCTP_PCB_FLAGS_UNBOUND | 2614 (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) | 2615 SCTP_PCB_FLAGS_DONT_WAKE); 2616 inp->sctp_features = (*inp_p)->sctp_features; 2617 inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features; 2618 inp->sctp_socket = so; 2619 inp->sctp_frag_point = (*inp_p)->sctp_frag_point; 2620 inp->max_cwnd = (*inp_p)->max_cwnd; 2621 inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off; 2622 inp->ecn_supported = (*inp_p)->ecn_supported; 2623 inp->prsctp_supported = (*inp_p)->prsctp_supported; 2624 inp->auth_supported = (*inp_p)->auth_supported; 2625 inp->asconf_supported = (*inp_p)->asconf_supported; 2626 inp->reconfig_supported = (*inp_p)->reconfig_supported; 2627 inp->nrsack_supported = (*inp_p)->nrsack_supported; 2628 inp->pktdrop_supported = (*inp_p)->pktdrop_supported; 2629 inp->partial_delivery_point = (*inp_p)->partial_delivery_point; 2630 inp->sctp_context = (*inp_p)->sctp_context; 2631 inp->local_strreset_support = (*inp_p)->local_strreset_support; 2632 inp->fibnum = (*inp_p)->fibnum; 2633 inp->inp_starting_point_for_iterator = NULL; 2634 /* 2635 * copy in the authentication parameters from the 2636 * original endpoint 2637 */ 2638 if (inp->sctp_ep.local_hmacs) 2639 sctp_free_hmaclist(inp->sctp_ep.local_hmacs); 2640 inp->sctp_ep.local_hmacs = 2641 sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs); 2642 if (inp->sctp_ep.local_auth_chunks) 2643 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks); 2644 inp->sctp_ep.local_auth_chunks = 2645 sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks); 2646 2647 /* 2648 * Now we must move it from one hash table to 2649 * another and get the tcb in the right place. 2650 */ 2651 2652 /* 2653 * This is where the one-2-one socket is put into 2654 * the accept state waiting for the accept! 2655 */ 2656 if (*stcb) { 2657 SCTP_ADD_SUBSTATE(*stcb, SCTP_STATE_IN_ACCEPT_QUEUE); 2658 } 2659 sctp_move_pcb_and_assoc(*inp_p, inp, *stcb); 2660 2661 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2662 SCTP_TCB_UNLOCK((*stcb)); 2663 2664 sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb, 2665 0); 2666 SCTP_TCB_LOCK((*stcb)); 2667 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2668 2669 /* 2670 * now we must check to see if we were aborted while 2671 * the move was going on and the lock/unlock 2672 * happened. 2673 */ 2674 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 2675 /* 2676 * yep it was, we leave the assoc attached 2677 * to the socket since the sctp_inpcb_free() 2678 * call will send an abort for us. 2679 */ 2680 SCTP_INP_DECR_REF(inp); 2681 return (NULL); 2682 } 2683 SCTP_INP_DECR_REF(inp); 2684 /* Switch over to the new guy */ 2685 *inp_p = inp; 2686 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2687 if (send_int_conf) { 2688 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2689 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2690 } 2691 2692 /* 2693 * Pull it from the incomplete queue and wake the 2694 * guy 2695 */ 2696 soisconnected(so); 2697 return (m); 2698 } 2699 } 2700 if (notification) { 2701 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2702 } 2703 if (send_int_conf) { 2704 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2705 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2706 } 2707 return (m); 2708 } 2709 2710 static void 2711 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED, 2712 struct sctp_tcb *stcb, struct sctp_nets *net) 2713 { 2714 /* cp must not be used, others call this without a c-ack :-) */ 2715 struct sctp_association *asoc; 2716 struct sctp_tmit_chunk *chk; 2717 2718 SCTPDBG(SCTP_DEBUG_INPUT2, 2719 "sctp_handle_cookie_ack: handling COOKIE-ACK\n"); 2720 if ((stcb == NULL) || (net == NULL)) { 2721 return; 2722 } 2723 2724 asoc = &stcb->asoc; 2725 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 2726 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 2727 asoc->overall_error_count, 2728 0, 2729 SCTP_FROM_SCTP_INPUT, 2730 __LINE__); 2731 } 2732 asoc->overall_error_count = 0; 2733 sctp_stop_all_cookie_timers(stcb); 2734 /* process according to association state */ 2735 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) { 2736 /* state change only needed when I am in right state */ 2737 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2738 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 2739 sctp_start_net_timers(stcb); 2740 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2741 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2742 stcb->sctp_ep, stcb, NULL); 2743 } 2744 /* update RTO */ 2745 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 2746 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2747 if (asoc->overall_error_count == 0) { 2748 sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, 2749 SCTP_RTT_FROM_NON_DATA); 2750 } 2751 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 2752 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2753 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2754 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 2755 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2756 if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) { 2757 soisconnected(stcb->sctp_socket); 2758 } 2759 } 2760 /* 2761 * since we did not send a HB make sure we don't double 2762 * things 2763 */ 2764 net->hb_responded = 1; 2765 2766 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2767 /* 2768 * We don't need to do the asconf thing, nor hb or 2769 * autoclose if the socket is closed. 2770 */ 2771 goto closed_socket; 2772 } 2773 2774 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 2775 stcb, net); 2776 2777 if (stcb->asoc.sctp_autoclose_ticks && 2778 sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2779 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 2780 stcb->sctp_ep, stcb, NULL); 2781 } 2782 /* 2783 * send ASCONF if parameters are pending and ASCONFs are 2784 * allowed (eg. addresses changed when init/cookie echo were 2785 * in flight) 2786 */ 2787 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) && 2788 (stcb->asoc.asconf_supported == 1) && 2789 (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) { 2790 #ifdef SCTP_TIMER_BASED_ASCONF 2791 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, 2792 stcb->sctp_ep, stcb, 2793 stcb->asoc.primary_destination); 2794 #else 2795 sctp_send_asconf(stcb, stcb->asoc.primary_destination, 2796 SCTP_ADDR_NOT_LOCKED); 2797 #endif 2798 } 2799 } 2800 closed_socket: 2801 /* Toss the cookie if I can */ 2802 sctp_toss_old_cookies(stcb, asoc); 2803 /* Restart the timer if we have pending data */ 2804 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) { 2805 if (chk->whoTo != NULL) { 2806 break; 2807 } 2808 } 2809 if (chk != NULL) { 2810 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 2811 } 2812 } 2813 2814 static void 2815 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp, 2816 struct sctp_tcb *stcb) 2817 { 2818 struct sctp_nets *net; 2819 struct sctp_tmit_chunk *lchk; 2820 struct sctp_ecne_chunk bkup; 2821 uint8_t override_bit; 2822 uint32_t tsn, window_data_tsn; 2823 int len; 2824 unsigned int pkt_cnt; 2825 2826 len = ntohs(cp->ch.chunk_length); 2827 if ((len != sizeof(struct sctp_ecne_chunk)) && 2828 (len != sizeof(struct old_sctp_ecne_chunk))) { 2829 return; 2830 } 2831 if (len == sizeof(struct old_sctp_ecne_chunk)) { 2832 /* Its the old format */ 2833 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk)); 2834 bkup.num_pkts_since_cwr = htonl(1); 2835 cp = &bkup; 2836 } 2837 SCTP_STAT_INCR(sctps_recvecne); 2838 tsn = ntohl(cp->tsn); 2839 pkt_cnt = ntohl(cp->num_pkts_since_cwr); 2840 lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead); 2841 if (lchk == NULL) { 2842 window_data_tsn = stcb->asoc.sending_seq - 1; 2843 } else { 2844 window_data_tsn = lchk->rec.data.tsn; 2845 } 2846 2847 /* Find where it was sent to if possible. */ 2848 net = NULL; 2849 TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) { 2850 if (lchk->rec.data.tsn == tsn) { 2851 net = lchk->whoTo; 2852 net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send; 2853 break; 2854 } 2855 if (SCTP_TSN_GT(lchk->rec.data.tsn, tsn)) { 2856 break; 2857 } 2858 } 2859 if (net == NULL) { 2860 /* 2861 * What to do. A previous send of a CWR was possibly lost. 2862 * See how old it is, we may have it marked on the actual 2863 * net. 2864 */ 2865 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 2866 if (tsn == net->last_cwr_tsn) { 2867 /* Found him, send it off */ 2868 break; 2869 } 2870 } 2871 if (net == NULL) { 2872 /* 2873 * If we reach here, we need to send a special CWR 2874 * that says hey, we did this a long time ago and 2875 * you lost the response. 2876 */ 2877 net = TAILQ_FIRST(&stcb->asoc.nets); 2878 if (net == NULL) { 2879 /* TSNH */ 2880 return; 2881 } 2882 override_bit = SCTP_CWR_REDUCE_OVERRIDE; 2883 } else { 2884 override_bit = 0; 2885 } 2886 } else { 2887 override_bit = 0; 2888 } 2889 if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) && 2890 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 2891 /* 2892 * JRS - Use the congestion control given in the pluggable 2893 * CC module 2894 */ 2895 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt); 2896 /* 2897 * We reduce once every RTT. So we will only lower cwnd at 2898 * the next sending seq i.e. the window_data_tsn 2899 */ 2900 net->cwr_window_tsn = window_data_tsn; 2901 net->ecn_ce_pkt_cnt += pkt_cnt; 2902 net->lost_cnt = pkt_cnt; 2903 net->last_cwr_tsn = tsn; 2904 } else { 2905 override_bit |= SCTP_CWR_IN_SAME_WINDOW; 2906 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) && 2907 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 2908 /* 2909 * Another loss in the same window update how many 2910 * marks/packets lost we have had. 2911 */ 2912 int cnt = 1; 2913 2914 if (pkt_cnt > net->lost_cnt) { 2915 /* Should be the case */ 2916 cnt = (pkt_cnt - net->lost_cnt); 2917 net->ecn_ce_pkt_cnt += cnt; 2918 } 2919 net->lost_cnt = pkt_cnt; 2920 net->last_cwr_tsn = tsn; 2921 /* 2922 * Most CC functions will ignore this call, since we 2923 * are in-window yet of the initial CE the peer saw. 2924 */ 2925 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt); 2926 } 2927 } 2928 /* 2929 * We always send a CWR this way if our previous one was lost our 2930 * peer will get an update, or if it is not time again to reduce we 2931 * still get the cwr to the peer. Note we set the override when we 2932 * could not find the TSN on the chunk or the destination network. 2933 */ 2934 sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit); 2935 } 2936 2937 static void 2938 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net) 2939 { 2940 /* 2941 * Here we get a CWR from the peer. We must look in the outqueue and 2942 * make sure that we have a covered ECNE in the control chunk part. 2943 * If so remove it. 2944 */ 2945 struct sctp_tmit_chunk *chk, *nchk; 2946 struct sctp_ecne_chunk *ecne; 2947 int override; 2948 uint32_t cwr_tsn; 2949 2950 cwr_tsn = ntohl(cp->tsn); 2951 override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE; 2952 TAILQ_FOREACH_SAFE(chk, &stcb->asoc.control_send_queue, sctp_next, nchk) { 2953 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) { 2954 continue; 2955 } 2956 if ((override == 0) && (chk->whoTo != net)) { 2957 /* Must be from the right src unless override is set */ 2958 continue; 2959 } 2960 ecne = mtod(chk->data, struct sctp_ecne_chunk *); 2961 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) { 2962 /* this covers this ECNE, we can remove it */ 2963 stcb->asoc.ecn_echo_cnt_onq--; 2964 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, 2965 sctp_next); 2966 stcb->asoc.ctrl_queue_cnt--; 2967 sctp_m_freem(chk->data); 2968 chk->data = NULL; 2969 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 2970 if (override == 0) { 2971 break; 2972 } 2973 } 2974 } 2975 } 2976 2977 static void 2978 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED, 2979 struct sctp_tcb *stcb, struct sctp_nets *net) 2980 { 2981 2982 SCTPDBG(SCTP_DEBUG_INPUT2, 2983 "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n"); 2984 if (stcb == NULL) 2985 return; 2986 2987 /* process according to association state */ 2988 if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 2989 /* unexpected SHUTDOWN-COMPLETE... so ignore... */ 2990 SCTPDBG(SCTP_DEBUG_INPUT2, 2991 "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n"); 2992 SCTP_TCB_UNLOCK(stcb); 2993 return; 2994 } 2995 /* notify upper layer protocol */ 2996 if (stcb->sctp_socket) { 2997 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2998 } 2999 #ifdef INVARIANTS 3000 if (!TAILQ_EMPTY(&stcb->asoc.send_queue) || 3001 !TAILQ_EMPTY(&stcb->asoc.sent_queue) || 3002 sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) { 3003 panic("Queues are not empty when handling SHUTDOWN-COMPLETE"); 3004 } 3005 #endif 3006 /* stop the timer */ 3007 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, 3008 SCTP_FROM_SCTP_INPUT + SCTP_LOC_24); 3009 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 3010 /* free the TCB */ 3011 SCTPDBG(SCTP_DEBUG_INPUT2, 3012 "sctp_handle_shutdown_complete: calls free-asoc\n"); 3013 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 3014 SCTP_FROM_SCTP_INPUT + SCTP_LOC_25); 3015 return; 3016 } 3017 3018 static int 3019 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc, 3020 struct sctp_nets *net, uint8_t flg) 3021 { 3022 switch (desc->chunk_type) { 3023 case SCTP_DATA: 3024 case SCTP_IDATA: 3025 /* find the tsn to resend (possibly) */ 3026 { 3027 uint32_t tsn; 3028 struct sctp_tmit_chunk *tp1; 3029 3030 tsn = ntohl(desc->tsn_ifany); 3031 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3032 if (tp1->rec.data.tsn == tsn) { 3033 /* found it */ 3034 break; 3035 } 3036 if (SCTP_TSN_GT(tp1->rec.data.tsn, tsn)) { 3037 /* not found */ 3038 tp1 = NULL; 3039 break; 3040 } 3041 } 3042 if (tp1 == NULL) { 3043 /* 3044 * Do it the other way , aka without paying 3045 * attention to queue seq order. 3046 */ 3047 SCTP_STAT_INCR(sctps_pdrpdnfnd); 3048 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3049 if (tp1->rec.data.tsn == tsn) { 3050 /* found it */ 3051 break; 3052 } 3053 } 3054 } 3055 if (tp1 == NULL) { 3056 SCTP_STAT_INCR(sctps_pdrptsnnf); 3057 } 3058 if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) { 3059 if (((flg & SCTP_BADCRC) == 0) && 3060 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3061 return (0); 3062 } 3063 if ((stcb->asoc.peers_rwnd == 0) && 3064 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3065 SCTP_STAT_INCR(sctps_pdrpdiwnp); 3066 return (0); 3067 } 3068 if (stcb->asoc.peers_rwnd == 0 && 3069 (flg & SCTP_FROM_MIDDLE_BOX)) { 3070 SCTP_STAT_INCR(sctps_pdrpdizrw); 3071 return (0); 3072 } 3073 if ((uint32_t)SCTP_BUF_LEN(tp1->data) < 3074 SCTP_DATA_CHUNK_OVERHEAD(stcb) + SCTP_NUM_DB_TO_VERIFY) { 3075 /* Payload not matching. */ 3076 SCTP_STAT_INCR(sctps_pdrpbadd); 3077 return (-1); 3078 } 3079 if (memcmp(mtod(tp1->data, caddr_t)+SCTP_DATA_CHUNK_OVERHEAD(stcb), 3080 desc->data_bytes, SCTP_NUM_DB_TO_VERIFY) != 0) { 3081 /* Payload not matching. */ 3082 SCTP_STAT_INCR(sctps_pdrpbadd); 3083 return (-1); 3084 } 3085 if (tp1->do_rtt) { 3086 /* 3087 * this guy had a RTO calculation 3088 * pending on it, cancel it 3089 */ 3090 if (tp1->whoTo->rto_needed == 0) { 3091 tp1->whoTo->rto_needed = 1; 3092 } 3093 tp1->do_rtt = 0; 3094 } 3095 SCTP_STAT_INCR(sctps_pdrpmark); 3096 if (tp1->sent != SCTP_DATAGRAM_RESEND) 3097 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3098 /* 3099 * mark it as if we were doing a FR, since 3100 * we will be getting gap ack reports behind 3101 * the info from the router. 3102 */ 3103 tp1->rec.data.doing_fast_retransmit = 1; 3104 /* 3105 * mark the tsn with what sequences can 3106 * cause a new FR. 3107 */ 3108 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) { 3109 tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq; 3110 } else { 3111 tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.tsn; 3112 } 3113 3114 /* restart the timer */ 3115 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3116 stcb, tp1->whoTo, 3117 SCTP_FROM_SCTP_INPUT + SCTP_LOC_26); 3118 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3119 stcb, tp1->whoTo); 3120 3121 /* fix counts and things */ 3122 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 3123 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP, 3124 tp1->whoTo->flight_size, 3125 tp1->book_size, 3126 (uint32_t)(uintptr_t)stcb, 3127 tp1->rec.data.tsn); 3128 } 3129 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3130 sctp_flight_size_decrease(tp1); 3131 sctp_total_flight_decrease(stcb, tp1); 3132 } 3133 tp1->sent = SCTP_DATAGRAM_RESEND; 3134 } { 3135 /* audit code */ 3136 unsigned int audit; 3137 3138 audit = 0; 3139 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3140 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3141 audit++; 3142 } 3143 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue, 3144 sctp_next) { 3145 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3146 audit++; 3147 } 3148 if (audit != stcb->asoc.sent_queue_retran_cnt) { 3149 SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n", 3150 audit, stcb->asoc.sent_queue_retran_cnt); 3151 #ifndef SCTP_AUDITING_ENABLED 3152 stcb->asoc.sent_queue_retran_cnt = audit; 3153 #endif 3154 } 3155 } 3156 } 3157 break; 3158 case SCTP_ASCONF: 3159 { 3160 struct sctp_tmit_chunk *asconf; 3161 3162 TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue, 3163 sctp_next) { 3164 if (asconf->rec.chunk_id.id == SCTP_ASCONF) { 3165 break; 3166 } 3167 } 3168 if (asconf) { 3169 if (asconf->sent != SCTP_DATAGRAM_RESEND) 3170 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3171 asconf->sent = SCTP_DATAGRAM_RESEND; 3172 asconf->snd_count--; 3173 } 3174 } 3175 break; 3176 case SCTP_INITIATION: 3177 /* resend the INIT */ 3178 stcb->asoc.dropped_special_cnt++; 3179 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) { 3180 /* 3181 * If we can get it in, in a few attempts we do 3182 * this, otherwise we let the timer fire. 3183 */ 3184 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, 3185 stcb, net, 3186 SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 3187 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 3188 } 3189 break; 3190 case SCTP_SELECTIVE_ACK: 3191 case SCTP_NR_SELECTIVE_ACK: 3192 /* resend the sack */ 3193 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED); 3194 break; 3195 case SCTP_HEARTBEAT_REQUEST: 3196 /* resend a demand HB */ 3197 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) { 3198 /* 3199 * Only retransmit if we KNOW we wont destroy the 3200 * tcb 3201 */ 3202 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 3203 } 3204 break; 3205 case SCTP_SHUTDOWN: 3206 sctp_send_shutdown(stcb, net); 3207 break; 3208 case SCTP_SHUTDOWN_ACK: 3209 sctp_send_shutdown_ack(stcb, net); 3210 break; 3211 case SCTP_COOKIE_ECHO: 3212 { 3213 struct sctp_tmit_chunk *cookie; 3214 3215 cookie = NULL; 3216 TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, 3217 sctp_next) { 3218 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) { 3219 break; 3220 } 3221 } 3222 if (cookie) { 3223 if (cookie->sent != SCTP_DATAGRAM_RESEND) 3224 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3225 cookie->sent = SCTP_DATAGRAM_RESEND; 3226 sctp_stop_all_cookie_timers(stcb); 3227 } 3228 } 3229 break; 3230 case SCTP_COOKIE_ACK: 3231 sctp_send_cookie_ack(stcb); 3232 break; 3233 case SCTP_ASCONF_ACK: 3234 /* resend last asconf ack */ 3235 sctp_send_asconf_ack(stcb); 3236 break; 3237 case SCTP_IFORWARD_CUM_TSN: 3238 case SCTP_FORWARD_CUM_TSN: 3239 send_forward_tsn(stcb, &stcb->asoc); 3240 break; 3241 /* can't do anything with these */ 3242 case SCTP_PACKET_DROPPED: 3243 case SCTP_INITIATION_ACK: /* this should not happen */ 3244 case SCTP_HEARTBEAT_ACK: 3245 case SCTP_ABORT_ASSOCIATION: 3246 case SCTP_OPERATION_ERROR: 3247 case SCTP_SHUTDOWN_COMPLETE: 3248 case SCTP_ECN_ECHO: 3249 case SCTP_ECN_CWR: 3250 default: 3251 break; 3252 } 3253 return (0); 3254 } 3255 3256 void 3257 sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list) 3258 { 3259 uint32_t i; 3260 uint16_t temp; 3261 3262 /* 3263 * We set things to 0xffffffff since this is the last delivered 3264 * sequence and we will be sending in 0 after the reset. 3265 */ 3266 3267 if (number_entries) { 3268 for (i = 0; i < number_entries; i++) { 3269 temp = ntohs(list[i]); 3270 if (temp >= stcb->asoc.streamincnt) { 3271 continue; 3272 } 3273 stcb->asoc.strmin[temp].last_mid_delivered = 0xffffffff; 3274 } 3275 } else { 3276 list = NULL; 3277 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3278 stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff; 3279 } 3280 } 3281 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3282 } 3283 3284 static void 3285 sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list) 3286 { 3287 uint32_t i; 3288 uint16_t temp; 3289 3290 if (number_entries > 0) { 3291 for (i = 0; i < number_entries; i++) { 3292 temp = ntohs(list[i]); 3293 if (temp >= stcb->asoc.streamoutcnt) { 3294 /* no such stream */ 3295 continue; 3296 } 3297 stcb->asoc.strmout[temp].next_mid_ordered = 0; 3298 stcb->asoc.strmout[temp].next_mid_unordered = 0; 3299 } 3300 } else { 3301 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3302 stcb->asoc.strmout[i].next_mid_ordered = 0; 3303 stcb->asoc.strmout[i].next_mid_unordered = 0; 3304 } 3305 } 3306 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3307 } 3308 3309 static void 3310 sctp_reset_clear_pending(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list) 3311 { 3312 uint32_t i; 3313 uint16_t temp; 3314 3315 if (number_entries > 0) { 3316 for (i = 0; i < number_entries; i++) { 3317 temp = ntohs(list[i]); 3318 if (temp >= stcb->asoc.streamoutcnt) { 3319 /* no such stream */ 3320 continue; 3321 } 3322 stcb->asoc.strmout[temp].state = SCTP_STREAM_OPEN; 3323 } 3324 } else { 3325 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3326 stcb->asoc.strmout[i].state = SCTP_STREAM_OPEN; 3327 } 3328 } 3329 } 3330 3331 struct sctp_stream_reset_request * 3332 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk) 3333 { 3334 struct sctp_association *asoc; 3335 struct sctp_chunkhdr *ch; 3336 struct sctp_stream_reset_request *r; 3337 struct sctp_tmit_chunk *chk; 3338 int len, clen; 3339 3340 asoc = &stcb->asoc; 3341 chk = asoc->str_reset; 3342 if (TAILQ_EMPTY(&asoc->control_send_queue) || 3343 (chk == NULL)) { 3344 asoc->stream_reset_outstanding = 0; 3345 return (NULL); 3346 } 3347 if (chk->data == NULL) { 3348 return (NULL); 3349 } 3350 if (bchk != NULL) { 3351 /* he wants a copy of the chk pointer */ 3352 *bchk = chk; 3353 } 3354 clen = chk->send_size; 3355 ch = mtod(chk->data, struct sctp_chunkhdr *); 3356 r = (struct sctp_stream_reset_request *)(ch + 1); 3357 if (ntohl(r->request_seq) == seq) { 3358 /* found it */ 3359 return (r); 3360 } 3361 len = SCTP_SIZE32(ntohs(r->ph.param_length)); 3362 if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) { 3363 /* move to the next one, there can only be a max of two */ 3364 r = (struct sctp_stream_reset_request *)((caddr_t)r + len); 3365 if (ntohl(r->request_seq) == seq) { 3366 return (r); 3367 } 3368 } 3369 /* that seq is not here */ 3370 return (NULL); 3371 } 3372 3373 static void 3374 sctp_clean_up_stream_reset(struct sctp_tcb *stcb) 3375 { 3376 struct sctp_association *asoc; 3377 struct sctp_tmit_chunk *chk; 3378 3379 asoc = &stcb->asoc; 3380 chk = asoc->str_reset; 3381 if (chk == NULL) { 3382 return; 3383 } 3384 asoc->str_reset = NULL; 3385 sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, 3386 NULL, SCTP_FROM_SCTP_INPUT + SCTP_LOC_28); 3387 TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next); 3388 asoc->ctrl_queue_cnt--; 3389 if (chk->data) { 3390 sctp_m_freem(chk->data); 3391 chk->data = NULL; 3392 } 3393 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3394 } 3395 3396 static int 3397 sctp_handle_stream_reset_response(struct sctp_tcb *stcb, 3398 uint32_t seq, uint32_t action, 3399 struct sctp_stream_reset_response *respin) 3400 { 3401 uint16_t type; 3402 int lparam_len; 3403 struct sctp_association *asoc = &stcb->asoc; 3404 struct sctp_tmit_chunk *chk; 3405 struct sctp_stream_reset_request *req_param; 3406 struct sctp_stream_reset_out_request *req_out_param; 3407 struct sctp_stream_reset_in_request *req_in_param; 3408 uint32_t number_entries; 3409 3410 if (asoc->stream_reset_outstanding == 0) { 3411 /* duplicate */ 3412 return (0); 3413 } 3414 if (seq == stcb->asoc.str_reset_seq_out) { 3415 req_param = sctp_find_stream_reset(stcb, seq, &chk); 3416 if (req_param != NULL) { 3417 stcb->asoc.str_reset_seq_out++; 3418 type = ntohs(req_param->ph.param_type); 3419 lparam_len = ntohs(req_param->ph.param_length); 3420 if (type == SCTP_STR_RESET_OUT_REQUEST) { 3421 int no_clear = 0; 3422 3423 req_out_param = (struct sctp_stream_reset_out_request *)req_param; 3424 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t); 3425 asoc->stream_reset_out_is_outstanding = 0; 3426 if (asoc->stream_reset_outstanding) 3427 asoc->stream_reset_outstanding--; 3428 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3429 /* do it */ 3430 sctp_reset_out_streams(stcb, number_entries, req_out_param->list_of_streams); 3431 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3432 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3433 } else if (action == SCTP_STREAM_RESET_RESULT_IN_PROGRESS) { 3434 /* 3435 * Set it up so we don't stop 3436 * retransmitting 3437 */ 3438 asoc->stream_reset_outstanding++; 3439 stcb->asoc.str_reset_seq_out--; 3440 asoc->stream_reset_out_is_outstanding = 1; 3441 no_clear = 1; 3442 } else { 3443 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3444 } 3445 if (no_clear == 0) { 3446 sctp_reset_clear_pending(stcb, number_entries, req_out_param->list_of_streams); 3447 } 3448 } else if (type == SCTP_STR_RESET_IN_REQUEST) { 3449 req_in_param = (struct sctp_stream_reset_in_request *)req_param; 3450 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t); 3451 if (asoc->stream_reset_outstanding) 3452 asoc->stream_reset_outstanding--; 3453 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3454 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb, 3455 number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3456 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3457 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb, 3458 number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3459 } 3460 } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) { 3461 /* Ok we now may have more streams */ 3462 int num_stream; 3463 3464 num_stream = stcb->asoc.strm_pending_add_size; 3465 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) { 3466 /* TSNH */ 3467 num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt; 3468 } 3469 stcb->asoc.strm_pending_add_size = 0; 3470 if (asoc->stream_reset_outstanding) 3471 asoc->stream_reset_outstanding--; 3472 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3473 /* Put the new streams into effect */ 3474 int i; 3475 3476 for (i = asoc->streamoutcnt; i < (asoc->streamoutcnt + num_stream); i++) { 3477 asoc->strmout[i].state = SCTP_STREAM_OPEN; 3478 } 3479 asoc->streamoutcnt += num_stream; 3480 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 3481 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3482 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3483 SCTP_STREAM_CHANGE_DENIED); 3484 } else { 3485 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3486 SCTP_STREAM_CHANGE_FAILED); 3487 } 3488 } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) { 3489 if (asoc->stream_reset_outstanding) 3490 asoc->stream_reset_outstanding--; 3491 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3492 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3493 SCTP_STREAM_CHANGE_DENIED); 3494 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3495 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3496 SCTP_STREAM_CHANGE_FAILED); 3497 } 3498 } else if (type == SCTP_STR_RESET_TSN_REQUEST) { 3499 /** 3500 * a) Adopt the new in tsn. 3501 * b) reset the map 3502 * c) Adopt the new out-tsn 3503 */ 3504 struct sctp_stream_reset_response_tsn *resp; 3505 struct sctp_forward_tsn_chunk fwdtsn; 3506 int abort_flag = 0; 3507 3508 if (respin == NULL) { 3509 /* huh ? */ 3510 return (0); 3511 } 3512 if (ntohs(respin->ph.param_length) < sizeof(struct sctp_stream_reset_response_tsn)) { 3513 return (0); 3514 } 3515 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3516 resp = (struct sctp_stream_reset_response_tsn *)respin; 3517 asoc->stream_reset_outstanding--; 3518 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3519 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3520 fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1); 3521 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3522 if (abort_flag) { 3523 return (1); 3524 } 3525 stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1); 3526 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3527 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3528 } 3529 3530 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 3531 stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn); 3532 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 3533 3534 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map; 3535 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size); 3536 3537 stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn); 3538 stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn; 3539 3540 sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL); 3541 sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL); 3542 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0); 3543 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3544 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3545 SCTP_ASSOC_RESET_DENIED); 3546 } else { 3547 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3548 SCTP_ASSOC_RESET_FAILED); 3549 } 3550 } 3551 /* get rid of the request and get the request flags */ 3552 if (asoc->stream_reset_outstanding == 0) { 3553 sctp_clean_up_stream_reset(stcb); 3554 } 3555 } 3556 } 3557 if (asoc->stream_reset_outstanding == 0) { 3558 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED); 3559 } 3560 return (0); 3561 } 3562 3563 static void 3564 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb, 3565 struct sctp_tmit_chunk *chk, 3566 struct sctp_stream_reset_in_request *req, int trunc) 3567 { 3568 uint32_t seq; 3569 int len, i; 3570 int number_entries; 3571 uint16_t temp; 3572 3573 /* 3574 * peer wants me to send a str-reset to him for my outgoing seq's if 3575 * seq_in is right. 3576 */ 3577 struct sctp_association *asoc = &stcb->asoc; 3578 3579 seq = ntohl(req->request_seq); 3580 if (asoc->str_reset_seq_in == seq) { 3581 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3582 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3583 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3584 } else if (trunc) { 3585 /* Can't do it, since they exceeded our buffer size */ 3586 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3587 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) { 3588 len = ntohs(req->ph.param_length); 3589 number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t)); 3590 if (number_entries) { 3591 for (i = 0; i < number_entries; i++) { 3592 temp = ntohs(req->list_of_streams[i]); 3593 if (temp >= stcb->asoc.streamoutcnt) { 3594 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3595 goto bad_boy; 3596 } 3597 req->list_of_streams[i] = temp; 3598 } 3599 for (i = 0; i < number_entries; i++) { 3600 if (stcb->asoc.strmout[req->list_of_streams[i]].state == SCTP_STREAM_OPEN) { 3601 stcb->asoc.strmout[req->list_of_streams[i]].state = SCTP_STREAM_RESET_PENDING; 3602 } 3603 } 3604 } else { 3605 /* Its all */ 3606 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3607 if (stcb->asoc.strmout[i].state == SCTP_STREAM_OPEN) 3608 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_PENDING; 3609 } 3610 } 3611 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3612 } else { 3613 /* Can't do it, since we have sent one out */ 3614 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 3615 } 3616 bad_boy: 3617 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3618 asoc->str_reset_seq_in++; 3619 } else if (asoc->str_reset_seq_in - 1 == seq) { 3620 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3621 } else if (asoc->str_reset_seq_in - 2 == seq) { 3622 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3623 } else { 3624 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3625 } 3626 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED); 3627 } 3628 3629 static int 3630 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb, 3631 struct sctp_tmit_chunk *chk, 3632 struct sctp_stream_reset_tsn_request *req) 3633 { 3634 /* reset all in and out and update the tsn */ 3635 /* 3636 * A) reset my str-seq's on in and out. B) Select a receive next, 3637 * and set cum-ack to it. Also process this selected number as a 3638 * fwd-tsn as well. C) set in the response my next sending seq. 3639 */ 3640 struct sctp_forward_tsn_chunk fwdtsn; 3641 struct sctp_association *asoc = &stcb->asoc; 3642 int abort_flag = 0; 3643 uint32_t seq; 3644 3645 seq = ntohl(req->request_seq); 3646 if (asoc->str_reset_seq_in == seq) { 3647 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3648 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 3649 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3650 } else { 3651 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3652 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3653 fwdtsn.ch.chunk_flags = 0; 3654 fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1); 3655 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3656 if (abort_flag) { 3657 return (1); 3658 } 3659 asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA; 3660 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3661 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3662 } 3663 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map; 3664 asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1; 3665 memset(asoc->mapping_array, 0, asoc->mapping_array_size); 3666 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 3667 memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size); 3668 atomic_add_int(&asoc->sending_seq, 1); 3669 /* save off historical data for retrans */ 3670 asoc->last_sending_seq[1] = asoc->last_sending_seq[0]; 3671 asoc->last_sending_seq[0] = asoc->sending_seq; 3672 asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0]; 3673 asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn; 3674 sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL); 3675 sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL); 3676 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3677 sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0); 3678 } 3679 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3680 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3681 asoc->str_reset_seq_in++; 3682 } else if (asoc->str_reset_seq_in - 1 == seq) { 3683 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3684 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3685 } else if (asoc->str_reset_seq_in - 2 == seq) { 3686 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1], 3687 asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]); 3688 } else { 3689 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3690 } 3691 return (0); 3692 } 3693 3694 static void 3695 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb, 3696 struct sctp_tmit_chunk *chk, 3697 struct sctp_stream_reset_out_request *req, int trunc) 3698 { 3699 uint32_t seq, tsn; 3700 int number_entries, len; 3701 struct sctp_association *asoc = &stcb->asoc; 3702 3703 seq = ntohl(req->request_seq); 3704 3705 /* now if its not a duplicate we process it */ 3706 if (asoc->str_reset_seq_in == seq) { 3707 len = ntohs(req->ph.param_length); 3708 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t)); 3709 /* 3710 * the sender is resetting, handle the list issue.. we must 3711 * a) verify if we can do the reset, if so no problem b) If 3712 * we can't do the reset we must copy the request. c) queue 3713 * it, and setup the data in processor to trigger it off 3714 * when needed and dequeue all the queued data. 3715 */ 3716 tsn = ntohl(req->send_reset_at_tsn); 3717 3718 /* move the reset action back one */ 3719 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3720 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3721 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3722 } else if (trunc) { 3723 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3724 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) { 3725 /* we can do it now */ 3726 sctp_reset_in_stream(stcb, number_entries, req->list_of_streams); 3727 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3728 } else { 3729 /* 3730 * we must queue it up and thus wait for the TSN's 3731 * to arrive that are at or before tsn 3732 */ 3733 struct sctp_stream_reset_list *liste; 3734 int siz; 3735 3736 siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t)); 3737 SCTP_MALLOC(liste, struct sctp_stream_reset_list *, 3738 siz, SCTP_M_STRESET); 3739 if (liste == NULL) { 3740 /* gak out of memory */ 3741 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3742 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3743 return; 3744 } 3745 liste->seq = seq; 3746 liste->tsn = tsn; 3747 liste->number_entries = number_entries; 3748 memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t)); 3749 TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp); 3750 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_IN_PROGRESS; 3751 } 3752 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3753 asoc->str_reset_seq_in++; 3754 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3755 /* 3756 * one seq back, just echo back last action since my 3757 * response was lost. 3758 */ 3759 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3760 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3761 /* 3762 * two seq back, just echo back last action since my 3763 * response was lost. 3764 */ 3765 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3766 } else { 3767 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3768 } 3769 } 3770 3771 static void 3772 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 3773 struct sctp_stream_reset_add_strm *str_add) 3774 { 3775 /* 3776 * Peer is requesting to add more streams. If its within our 3777 * max-streams we will allow it. 3778 */ 3779 uint32_t num_stream, i; 3780 uint32_t seq; 3781 struct sctp_association *asoc = &stcb->asoc; 3782 struct sctp_queued_to_read *ctl, *nctl; 3783 3784 /* Get the number. */ 3785 seq = ntohl(str_add->request_seq); 3786 num_stream = ntohs(str_add->number_of_streams); 3787 /* Now what would be the new total? */ 3788 if (asoc->str_reset_seq_in == seq) { 3789 num_stream += stcb->asoc.streamincnt; 3790 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3791 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 3792 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3793 } else if ((num_stream > stcb->asoc.max_inbound_streams) || 3794 (num_stream > 0xffff)) { 3795 /* We must reject it they ask for to many */ 3796 denied: 3797 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3798 } else { 3799 /* Ok, we can do that :-) */ 3800 struct sctp_stream_in *oldstrm; 3801 3802 /* save off the old */ 3803 oldstrm = stcb->asoc.strmin; 3804 SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *, 3805 (num_stream * sizeof(struct sctp_stream_in)), 3806 SCTP_M_STRMI); 3807 if (stcb->asoc.strmin == NULL) { 3808 stcb->asoc.strmin = oldstrm; 3809 goto denied; 3810 } 3811 /* copy off the old data */ 3812 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3813 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 3814 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue); 3815 stcb->asoc.strmin[i].sid = i; 3816 stcb->asoc.strmin[i].last_mid_delivered = oldstrm[i].last_mid_delivered; 3817 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started; 3818 stcb->asoc.strmin[i].pd_api_started = oldstrm[i].pd_api_started; 3819 /* now anything on those queues? */ 3820 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next_instrm, nctl) { 3821 TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next_instrm); 3822 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next_instrm); 3823 } 3824 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].uno_inqueue, next_instrm, nctl) { 3825 TAILQ_REMOVE(&oldstrm[i].uno_inqueue, ctl, next_instrm); 3826 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].uno_inqueue, ctl, next_instrm); 3827 } 3828 } 3829 /* Init the new streams */ 3830 for (i = stcb->asoc.streamincnt; i < num_stream; i++) { 3831 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 3832 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue); 3833 stcb->asoc.strmin[i].sid = i; 3834 stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff; 3835 stcb->asoc.strmin[i].pd_api_started = 0; 3836 stcb->asoc.strmin[i].delivery_started = 0; 3837 } 3838 SCTP_FREE(oldstrm, SCTP_M_STRMI); 3839 /* update the size */ 3840 stcb->asoc.streamincnt = num_stream; 3841 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3842 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 3843 } 3844 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3845 asoc->str_reset_seq_in++; 3846 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3847 /* 3848 * one seq back, just echo back last action since my 3849 * response was lost. 3850 */ 3851 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3852 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3853 /* 3854 * two seq back, just echo back last action since my 3855 * response was lost. 3856 */ 3857 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3858 } else { 3859 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3860 } 3861 } 3862 3863 static void 3864 sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 3865 struct sctp_stream_reset_add_strm *str_add) 3866 { 3867 /* 3868 * Peer is requesting to add more streams. If its within our 3869 * max-streams we will allow it. 3870 */ 3871 uint16_t num_stream; 3872 uint32_t seq; 3873 struct sctp_association *asoc = &stcb->asoc; 3874 3875 /* Get the number. */ 3876 seq = ntohl(str_add->request_seq); 3877 num_stream = ntohs(str_add->number_of_streams); 3878 /* Now what would be the new total? */ 3879 if (asoc->str_reset_seq_in == seq) { 3880 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3881 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 3882 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3883 } else if (stcb->asoc.stream_reset_outstanding) { 3884 /* We must reject it we have something pending */ 3885 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 3886 } else { 3887 /* Ok, we can do that :-) */ 3888 int mychk; 3889 3890 mychk = stcb->asoc.streamoutcnt; 3891 mychk += num_stream; 3892 if (mychk < 0x10000) { 3893 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3894 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 1, num_stream, 0, 1)) { 3895 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3896 } 3897 } else { 3898 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3899 } 3900 } 3901 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]); 3902 asoc->str_reset_seq_in++; 3903 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3904 /* 3905 * one seq back, just echo back last action since my 3906 * response was lost. 3907 */ 3908 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3909 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3910 /* 3911 * two seq back, just echo back last action since my 3912 * response was lost. 3913 */ 3914 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3915 } else { 3916 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3917 } 3918 } 3919 3920 #ifdef __GNUC__ 3921 __attribute__((noinline)) 3922 #endif 3923 static int 3924 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset, 3925 struct sctp_chunkhdr *ch_req) 3926 { 3927 uint16_t remaining_length, param_len, ptype; 3928 struct sctp_paramhdr pstore; 3929 uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE]; 3930 uint32_t seq = 0; 3931 int num_req = 0; 3932 int trunc = 0; 3933 struct sctp_tmit_chunk *chk; 3934 struct sctp_chunkhdr *ch; 3935 struct sctp_paramhdr *ph; 3936 int ret_code = 0; 3937 int num_param = 0; 3938 3939 /* now it may be a reset or a reset-response */ 3940 remaining_length = ntohs(ch_req->chunk_length) - sizeof(struct sctp_chunkhdr); 3941 3942 /* setup for adding the response */ 3943 sctp_alloc_a_chunk(stcb, chk); 3944 if (chk == NULL) { 3945 return (ret_code); 3946 } 3947 chk->copy_by_ref = 0; 3948 chk->rec.chunk_id.id = SCTP_STREAM_RESET; 3949 chk->rec.chunk_id.can_take_data = 0; 3950 chk->flags = 0; 3951 chk->asoc = &stcb->asoc; 3952 chk->no_fr_allowed = 0; 3953 chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr); 3954 chk->book_size_scale = 0; 3955 chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA); 3956 if (chk->data == NULL) { 3957 strres_nochunk: 3958 if (chk->data) { 3959 sctp_m_freem(chk->data); 3960 chk->data = NULL; 3961 } 3962 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3963 return (ret_code); 3964 } 3965 SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD); 3966 3967 /* setup chunk parameters */ 3968 chk->sent = SCTP_DATAGRAM_UNSENT; 3969 chk->snd_count = 0; 3970 chk->whoTo = NULL; 3971 3972 ch = mtod(chk->data, struct sctp_chunkhdr *); 3973 ch->chunk_type = SCTP_STREAM_RESET; 3974 ch->chunk_flags = 0; 3975 ch->chunk_length = htons(chk->send_size); 3976 SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size); 3977 offset += sizeof(struct sctp_chunkhdr); 3978 while (remaining_length >= sizeof(struct sctp_paramhdr)) { 3979 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *)&pstore); 3980 if (ph == NULL) { 3981 /* TSNH */ 3982 break; 3983 } 3984 param_len = ntohs(ph->param_length); 3985 if ((param_len > remaining_length) || 3986 (param_len < (sizeof(struct sctp_paramhdr) + sizeof(uint32_t)))) { 3987 /* bad parameter length */ 3988 break; 3989 } 3990 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, sizeof(cstore)), 3991 (uint8_t *)&cstore); 3992 if (ph == NULL) { 3993 /* TSNH */ 3994 break; 3995 } 3996 ptype = ntohs(ph->param_type); 3997 num_param++; 3998 if (param_len > sizeof(cstore)) { 3999 trunc = 1; 4000 } else { 4001 trunc = 0; 4002 } 4003 if (num_param > SCTP_MAX_RESET_PARAMS) { 4004 /* hit the max of parameters already sorry.. */ 4005 break; 4006 } 4007 if (ptype == SCTP_STR_RESET_OUT_REQUEST) { 4008 struct sctp_stream_reset_out_request *req_out; 4009 4010 if (param_len < sizeof(struct sctp_stream_reset_out_request)) { 4011 break; 4012 } 4013 req_out = (struct sctp_stream_reset_out_request *)ph; 4014 num_req++; 4015 if (stcb->asoc.stream_reset_outstanding) { 4016 seq = ntohl(req_out->response_seq); 4017 if (seq == stcb->asoc.str_reset_seq_out) { 4018 /* implicit ack */ 4019 (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL); 4020 } 4021 } 4022 sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc); 4023 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) { 4024 struct sctp_stream_reset_add_strm *str_add; 4025 4026 if (param_len < sizeof(struct sctp_stream_reset_add_strm)) { 4027 break; 4028 } 4029 str_add = (struct sctp_stream_reset_add_strm *)ph; 4030 num_req++; 4031 sctp_handle_str_reset_add_strm(stcb, chk, str_add); 4032 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) { 4033 struct sctp_stream_reset_add_strm *str_add; 4034 4035 if (param_len < sizeof(struct sctp_stream_reset_add_strm)) { 4036 break; 4037 } 4038 str_add = (struct sctp_stream_reset_add_strm *)ph; 4039 num_req++; 4040 sctp_handle_str_reset_add_out_strm(stcb, chk, str_add); 4041 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) { 4042 struct sctp_stream_reset_in_request *req_in; 4043 4044 num_req++; 4045 req_in = (struct sctp_stream_reset_in_request *)ph; 4046 sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc); 4047 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) { 4048 struct sctp_stream_reset_tsn_request *req_tsn; 4049 4050 num_req++; 4051 req_tsn = (struct sctp_stream_reset_tsn_request *)ph; 4052 if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) { 4053 ret_code = 1; 4054 goto strres_nochunk; 4055 } 4056 /* no more */ 4057 break; 4058 } else if (ptype == SCTP_STR_RESET_RESPONSE) { 4059 struct sctp_stream_reset_response *resp; 4060 uint32_t result; 4061 4062 if (param_len < sizeof(struct sctp_stream_reset_response)) { 4063 break; 4064 } 4065 resp = (struct sctp_stream_reset_response *)ph; 4066 seq = ntohl(resp->response_seq); 4067 result = ntohl(resp->result); 4068 if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) { 4069 ret_code = 1; 4070 goto strres_nochunk; 4071 } 4072 } else { 4073 break; 4074 } 4075 offset += SCTP_SIZE32(param_len); 4076 if (remaining_length >= SCTP_SIZE32(param_len)) { 4077 remaining_length -= SCTP_SIZE32(param_len); 4078 } else { 4079 remaining_length = 0; 4080 } 4081 } 4082 if (num_req == 0) { 4083 /* we have no response free the stuff */ 4084 goto strres_nochunk; 4085 } 4086 /* ok we have a chunk to link in */ 4087 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, 4088 chk, 4089 sctp_next); 4090 stcb->asoc.ctrl_queue_cnt++; 4091 return (ret_code); 4092 } 4093 4094 /* 4095 * Handle a router or endpoints report of a packet loss, there are two ways 4096 * to handle this, either we get the whole packet and must disect it 4097 * ourselves (possibly with truncation and or corruption) or it is a summary 4098 * from a middle box that did the disectting for us. 4099 */ 4100 static void 4101 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp, 4102 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 4103 { 4104 struct sctp_chunk_desc desc; 4105 struct sctp_chunkhdr *chk_hdr; 4106 struct sctp_data_chunk *data_chunk; 4107 struct sctp_idata_chunk *idata_chunk; 4108 uint32_t bottle_bw, on_queue; 4109 uint32_t offset, chk_len; 4110 uint16_t pktdrp_len; 4111 uint8_t pktdrp_flags; 4112 4113 KASSERT(sizeof(struct sctp_pktdrop_chunk) <= limit, 4114 ("PKTDROP chunk too small")); 4115 pktdrp_flags = cp->ch.chunk_flags; 4116 pktdrp_len = ntohs(cp->ch.chunk_length); 4117 KASSERT(limit <= pktdrp_len, ("Inconsistent limit")); 4118 if (pktdrp_flags & SCTP_PACKET_TRUNCATED) { 4119 if (ntohs(cp->trunc_len) <= pktdrp_len - sizeof(struct sctp_pktdrop_chunk)) { 4120 /* The peer plays games with us. */ 4121 return; 4122 } 4123 } 4124 limit -= sizeof(struct sctp_pktdrop_chunk); 4125 offset = 0; 4126 if (offset == limit) { 4127 if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) { 4128 SCTP_STAT_INCR(sctps_pdrpbwrpt); 4129 } 4130 } else if (offset + sizeof(struct sctphdr) > limit) { 4131 /* Only a partial SCTP common header. */ 4132 SCTP_STAT_INCR(sctps_pdrpcrupt); 4133 offset = limit; 4134 } else { 4135 /* XXX: Check embedded SCTP common header. */ 4136 offset += sizeof(struct sctphdr); 4137 } 4138 /* Now parse through the chunks themselves. */ 4139 while (offset < limit) { 4140 if (offset + sizeof(struct sctp_chunkhdr) > limit) { 4141 SCTP_STAT_INCR(sctps_pdrpcrupt); 4142 break; 4143 } 4144 chk_hdr = (struct sctp_chunkhdr *)(cp->data + offset); 4145 desc.chunk_type = chk_hdr->chunk_type; 4146 /* get amount we need to move */ 4147 chk_len = (uint32_t)ntohs(chk_hdr->chunk_length); 4148 if (chk_len < sizeof(struct sctp_chunkhdr)) { 4149 /* Someone is lying... */ 4150 break; 4151 } 4152 if (desc.chunk_type == SCTP_DATA) { 4153 if (stcb->asoc.idata_supported) { 4154 /* Some is playing games with us. */ 4155 break; 4156 } 4157 if (chk_len <= sizeof(struct sctp_data_chunk)) { 4158 /* Some is playing games with us. */ 4159 break; 4160 } 4161 if (chk_len < sizeof(struct sctp_data_chunk) + SCTP_NUM_DB_TO_VERIFY) { 4162 /* 4163 * Not enough data bytes available in the 4164 * chunk. 4165 */ 4166 SCTP_STAT_INCR(sctps_pdrpnedat); 4167 goto next_chunk; 4168 } 4169 if (offset + sizeof(struct sctp_data_chunk) + SCTP_NUM_DB_TO_VERIFY > limit) { 4170 /* Not enough data in buffer. */ 4171 break; 4172 } 4173 data_chunk = (struct sctp_data_chunk *)(cp->data + offset); 4174 memcpy(desc.data_bytes, data_chunk + 1, SCTP_NUM_DB_TO_VERIFY); 4175 desc.tsn_ifany = data_chunk->dp.tsn; 4176 if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) { 4177 SCTP_STAT_INCR(sctps_pdrpmbda); 4178 } 4179 } else if (desc.chunk_type == SCTP_IDATA) { 4180 if (!stcb->asoc.idata_supported) { 4181 /* Some is playing games with us. */ 4182 break; 4183 } 4184 if (chk_len <= sizeof(struct sctp_idata_chunk)) { 4185 /* Some is playing games with us. */ 4186 break; 4187 } 4188 if (chk_len < sizeof(struct sctp_idata_chunk) + SCTP_NUM_DB_TO_VERIFY) { 4189 /* 4190 * Not enough data bytes available in the 4191 * chunk. 4192 */ 4193 SCTP_STAT_INCR(sctps_pdrpnedat); 4194 goto next_chunk; 4195 } 4196 if (offset + sizeof(struct sctp_idata_chunk) + SCTP_NUM_DB_TO_VERIFY > limit) { 4197 /* Not enough data in buffer. */ 4198 break; 4199 } 4200 idata_chunk = (struct sctp_idata_chunk *)(cp->data + offset); 4201 memcpy(desc.data_bytes, idata_chunk + 1, SCTP_NUM_DB_TO_VERIFY); 4202 desc.tsn_ifany = idata_chunk->dp.tsn; 4203 if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) { 4204 SCTP_STAT_INCR(sctps_pdrpmbda); 4205 } 4206 } else { 4207 if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) { 4208 SCTP_STAT_INCR(sctps_pdrpmbct); 4209 } 4210 } 4211 if (process_chunk_drop(stcb, &desc, net, pktdrp_flags)) { 4212 SCTP_STAT_INCR(sctps_pdrppdbrk); 4213 break; 4214 } 4215 next_chunk: 4216 offset += SCTP_SIZE32(chk_len); 4217 } 4218 /* Now update any rwnd --- possibly */ 4219 if ((pktdrp_flags & SCTP_FROM_MIDDLE_BOX) == 0) { 4220 /* From a peer, we get a rwnd report */ 4221 uint32_t a_rwnd; 4222 4223 SCTP_STAT_INCR(sctps_pdrpfehos); 4224 4225 bottle_bw = ntohl(cp->bottle_bw); 4226 on_queue = ntohl(cp->current_onq); 4227 if (bottle_bw && on_queue) { 4228 /* a rwnd report is in here */ 4229 if (bottle_bw > on_queue) 4230 a_rwnd = bottle_bw - on_queue; 4231 else 4232 a_rwnd = 0; 4233 4234 if (a_rwnd == 0) 4235 stcb->asoc.peers_rwnd = 0; 4236 else { 4237 if (a_rwnd > stcb->asoc.total_flight) { 4238 stcb->asoc.peers_rwnd = 4239 a_rwnd - stcb->asoc.total_flight; 4240 } else { 4241 stcb->asoc.peers_rwnd = 0; 4242 } 4243 if (stcb->asoc.peers_rwnd < 4244 stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 4245 /* SWS sender side engages */ 4246 stcb->asoc.peers_rwnd = 0; 4247 } 4248 } 4249 } 4250 } else { 4251 SCTP_STAT_INCR(sctps_pdrpfmbox); 4252 } 4253 4254 /* now middle boxes in sat networks get a cwnd bump */ 4255 if ((pktdrp_flags & SCTP_FROM_MIDDLE_BOX) && 4256 (stcb->asoc.sat_t3_loss_recovery == 0) && 4257 (stcb->asoc.sat_network)) { 4258 /* 4259 * This is debatable but for sat networks it makes sense 4260 * Note if a T3 timer has went off, we will prohibit any 4261 * changes to cwnd until we exit the t3 loss recovery. 4262 */ 4263 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb, 4264 net, cp, &bottle_bw, &on_queue); 4265 } 4266 } 4267 4268 /* 4269 * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to 4270 * still contain IP/SCTP header - stcb: is the tcb found for this packet - 4271 * offset: offset into the mbuf chain to first chunkhdr - length: is the 4272 * length of the complete packet outputs: - length: modified to remaining 4273 * length after control processing - netp: modified to new sctp_nets after 4274 * cookie-echo processing - return NULL to discard the packet (ie. no asoc, 4275 * bad packet,...) otherwise return the tcb for this packet 4276 */ 4277 #ifdef __GNUC__ 4278 __attribute__((noinline)) 4279 #endif 4280 static struct sctp_tcb * 4281 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length, 4282 struct sockaddr *src, struct sockaddr *dst, 4283 struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp, 4284 struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen, 4285 uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum, 4286 uint32_t vrf_id, uint16_t port) 4287 { 4288 struct sctp_association *asoc; 4289 struct mbuf *op_err; 4290 char msg[SCTP_DIAG_INFO_LEN]; 4291 uint32_t vtag_in; 4292 int num_chunks = 0; /* number of control chunks processed */ 4293 uint32_t chk_length, contiguous; 4294 int ret; 4295 int abort_no_unlock = 0; 4296 int ecne_seen = 0; 4297 4298 /* 4299 * How big should this be, and should it be alloc'd? Lets try the 4300 * d-mtu-ceiling for now (2k) and that should hopefully work ... 4301 * until we get into jumbo grams and such.. 4302 */ 4303 uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE]; 4304 int got_auth = 0; 4305 uint32_t auth_offset = 0, auth_len = 0; 4306 int auth_skipped = 0; 4307 int asconf_cnt = 0; 4308 4309 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n", 4310 iphlen, *offset, length, (void *)stcb); 4311 4312 if (stcb) { 4313 SCTP_TCB_LOCK_ASSERT(stcb); 4314 } 4315 /* validate chunk header length... */ 4316 if (ntohs(ch->chunk_length) < sizeof(*ch)) { 4317 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n", 4318 ntohs(ch->chunk_length)); 4319 *offset = length; 4320 return (stcb); 4321 } 4322 /* 4323 * validate the verification tag 4324 */ 4325 vtag_in = ntohl(sh->v_tag); 4326 4327 if (ch->chunk_type == SCTP_INITIATION) { 4328 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n", 4329 ntohs(ch->chunk_length), vtag_in); 4330 if (vtag_in != 0) { 4331 /* protocol error- silently discard... */ 4332 SCTP_STAT_INCR(sctps_badvtag); 4333 if (stcb != NULL) { 4334 SCTP_TCB_UNLOCK(stcb); 4335 } 4336 return (NULL); 4337 } 4338 } else if (ch->chunk_type != SCTP_COOKIE_ECHO) { 4339 /* 4340 * If there is no stcb, skip the AUTH chunk and process 4341 * later after a stcb is found (to validate the lookup was 4342 * valid. 4343 */ 4344 if ((ch->chunk_type == SCTP_AUTHENTICATION) && 4345 (stcb == NULL) && 4346 (inp->auth_supported == 1)) { 4347 /* save this chunk for later processing */ 4348 auth_skipped = 1; 4349 auth_offset = *offset; 4350 auth_len = ntohs(ch->chunk_length); 4351 4352 /* (temporarily) move past this chunk */ 4353 *offset += SCTP_SIZE32(auth_len); 4354 if (*offset >= length) { 4355 /* no more data left in the mbuf chain */ 4356 *offset = length; 4357 return (NULL); 4358 } 4359 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4360 sizeof(struct sctp_chunkhdr), chunk_buf); 4361 } 4362 if (ch == NULL) { 4363 /* Help */ 4364 *offset = length; 4365 return (stcb); 4366 } 4367 if (ch->chunk_type == SCTP_COOKIE_ECHO) { 4368 goto process_control_chunks; 4369 } 4370 /* 4371 * first check if it's an ASCONF with an unknown src addr we 4372 * need to look inside to find the association 4373 */ 4374 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) { 4375 struct sctp_chunkhdr *asconf_ch = ch; 4376 uint32_t asconf_offset = 0, asconf_len = 0; 4377 4378 /* inp's refcount may be reduced */ 4379 SCTP_INP_INCR_REF(inp); 4380 4381 asconf_offset = *offset; 4382 do { 4383 asconf_len = ntohs(asconf_ch->chunk_length); 4384 if (asconf_len < sizeof(struct sctp_asconf_paramhdr)) 4385 break; 4386 stcb = sctp_findassociation_ep_asconf(m, 4387 *offset, 4388 dst, 4389 sh, &inp, netp, vrf_id); 4390 if (stcb != NULL) 4391 break; 4392 asconf_offset += SCTP_SIZE32(asconf_len); 4393 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset, 4394 sizeof(struct sctp_chunkhdr), chunk_buf); 4395 } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF); 4396 if (stcb == NULL) { 4397 /* 4398 * reduce inp's refcount if not reduced in 4399 * sctp_findassociation_ep_asconf(). 4400 */ 4401 SCTP_INP_DECR_REF(inp); 4402 } 4403 4404 /* now go back and verify any auth chunk to be sure */ 4405 if (auth_skipped && (stcb != NULL)) { 4406 struct sctp_auth_chunk *auth; 4407 4408 if (auth_len <= SCTP_CHUNK_BUFFER_SIZE) { 4409 auth = (struct sctp_auth_chunk *)sctp_m_getptr(m, auth_offset, auth_len, chunk_buf); 4410 got_auth = 1; 4411 auth_skipped = 0; 4412 } else { 4413 auth = NULL; 4414 } 4415 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, 4416 auth_offset)) { 4417 /* auth HMAC failed so dump it */ 4418 *offset = length; 4419 return (stcb); 4420 } else { 4421 /* remaining chunks are HMAC checked */ 4422 stcb->asoc.authenticated = 1; 4423 } 4424 } 4425 } 4426 if (stcb == NULL) { 4427 SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 4428 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4429 msg); 4430 /* no association, so it's out of the blue... */ 4431 sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, op_err, 4432 mflowtype, mflowid, inp->fibnum, 4433 vrf_id, port); 4434 *offset = length; 4435 return (NULL); 4436 } 4437 asoc = &stcb->asoc; 4438 /* ABORT and SHUTDOWN can use either v_tag... */ 4439 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) || 4440 (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) || 4441 (ch->chunk_type == SCTP_PACKET_DROPPED)) { 4442 /* Take the T-bit always into account. */ 4443 if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) && 4444 (vtag_in == asoc->my_vtag)) || 4445 (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) && 4446 (asoc->peer_vtag != htonl(0)) && 4447 (vtag_in == asoc->peer_vtag))) { 4448 /* this is valid */ 4449 } else { 4450 /* drop this packet... */ 4451 SCTP_STAT_INCR(sctps_badvtag); 4452 if (stcb != NULL) { 4453 SCTP_TCB_UNLOCK(stcb); 4454 } 4455 return (NULL); 4456 } 4457 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 4458 if (vtag_in != asoc->my_vtag) { 4459 /* 4460 * this could be a stale SHUTDOWN-ACK or the 4461 * peer never got the SHUTDOWN-COMPLETE and 4462 * is still hung; we have started a new asoc 4463 * but it won't complete until the shutdown 4464 * is completed 4465 */ 4466 if (stcb != NULL) { 4467 SCTP_TCB_UNLOCK(stcb); 4468 } 4469 SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 4470 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4471 msg); 4472 sctp_handle_ootb(m, iphlen, *offset, src, dst, 4473 sh, inp, op_err, 4474 mflowtype, mflowid, fibnum, 4475 vrf_id, port); 4476 return (NULL); 4477 } 4478 } else { 4479 /* for all other chunks, vtag must match */ 4480 if (vtag_in != asoc->my_vtag) { 4481 /* invalid vtag... */ 4482 SCTPDBG(SCTP_DEBUG_INPUT3, 4483 "invalid vtag: %xh, expect %xh\n", 4484 vtag_in, asoc->my_vtag); 4485 SCTP_STAT_INCR(sctps_badvtag); 4486 if (stcb != NULL) { 4487 SCTP_TCB_UNLOCK(stcb); 4488 } 4489 *offset = length; 4490 return (NULL); 4491 } 4492 } 4493 } /* end if !SCTP_COOKIE_ECHO */ 4494 /* 4495 * process all control chunks... 4496 */ 4497 if (((ch->chunk_type == SCTP_SELECTIVE_ACK) || 4498 (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) || 4499 (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) && 4500 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 4501 /* implied cookie-ack.. we must have lost the ack */ 4502 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, 4503 *netp); 4504 } 4505 4506 process_control_chunks: 4507 while (IS_SCTP_CONTROL(ch)) { 4508 /* validate chunk length */ 4509 chk_length = ntohs(ch->chunk_length); 4510 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n", 4511 ch->chunk_type, chk_length); 4512 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length); 4513 if (chk_length < sizeof(*ch) || 4514 (*offset + (int)chk_length) > length) { 4515 *offset = length; 4516 return (stcb); 4517 } 4518 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks); 4519 /* 4520 * INIT and INIT-ACK only gets the init ack "header" portion 4521 * only because we don't have to process the peer's COOKIE. 4522 * All others get a complete chunk. 4523 */ 4524 switch (ch->chunk_type) { 4525 case SCTP_INITIATION: 4526 contiguous = sizeof(struct sctp_init_chunk); 4527 break; 4528 case SCTP_INITIATION_ACK: 4529 contiguous = sizeof(struct sctp_init_ack_chunk); 4530 break; 4531 default: 4532 contiguous = min(chk_length, sizeof(chunk_buf)); 4533 break; 4534 } 4535 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4536 contiguous, 4537 chunk_buf); 4538 if (ch == NULL) { 4539 *offset = length; 4540 return (stcb); 4541 } 4542 4543 num_chunks++; 4544 /* Save off the last place we got a control from */ 4545 if (stcb != NULL) { 4546 if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) { 4547 /* 4548 * allow last_control to be NULL if 4549 * ASCONF... ASCONF processing will find the 4550 * right net later 4551 */ 4552 if ((netp != NULL) && (*netp != NULL)) 4553 stcb->asoc.last_control_chunk_from = *netp; 4554 } 4555 } 4556 #ifdef SCTP_AUDITING_ENABLED 4557 sctp_audit_log(0xB0, ch->chunk_type); 4558 #endif 4559 4560 /* check to see if this chunk required auth, but isn't */ 4561 if ((stcb != NULL) && 4562 sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) && 4563 !stcb->asoc.authenticated) { 4564 /* "silently" ignore */ 4565 SCTP_STAT_INCR(sctps_recvauthmissing); 4566 goto next_chunk; 4567 } 4568 switch (ch->chunk_type) { 4569 case SCTP_INITIATION: 4570 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n"); 4571 /* The INIT chunk must be the only chunk. */ 4572 if ((num_chunks > 1) || 4573 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4574 /* 4575 * RFC 4960bis requires stopping the 4576 * processing of the packet. 4577 */ 4578 *offset = length; 4579 return (stcb); 4580 } 4581 /* Honor our resource limit. */ 4582 if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) { 4583 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 4584 sctp_abort_association(inp, stcb, m, iphlen, 4585 src, dst, sh, op_err, 4586 mflowtype, mflowid, 4587 vrf_id, port); 4588 *offset = length; 4589 return (NULL); 4590 } 4591 sctp_handle_init(m, iphlen, *offset, src, dst, sh, 4592 (struct sctp_init_chunk *)ch, inp, 4593 stcb, *netp, &abort_no_unlock, 4594 mflowtype, mflowid, 4595 vrf_id, port); 4596 *offset = length; 4597 if ((!abort_no_unlock) && (stcb != NULL)) { 4598 SCTP_TCB_UNLOCK(stcb); 4599 } 4600 return (NULL); 4601 break; 4602 case SCTP_PAD_CHUNK: 4603 break; 4604 case SCTP_INITIATION_ACK: 4605 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT_ACK\n"); 4606 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4607 /* We are not interested anymore */ 4608 if ((stcb != NULL) && (stcb->asoc.total_output_queue_size)) { 4609 ; 4610 } else { 4611 *offset = length; 4612 if (stcb != NULL) { 4613 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 4614 SCTP_FROM_SCTP_INPUT + SCTP_LOC_29); 4615 } 4616 return (NULL); 4617 } 4618 } 4619 /* The INIT-ACK chunk must be the only chunk. */ 4620 if ((num_chunks > 1) || 4621 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4622 *offset = length; 4623 return (stcb); 4624 } 4625 if ((netp != NULL) && (*netp != NULL)) { 4626 ret = sctp_handle_init_ack(m, iphlen, *offset, 4627 src, dst, sh, 4628 (struct sctp_init_ack_chunk *)ch, 4629 stcb, *netp, 4630 &abort_no_unlock, 4631 mflowtype, mflowid, 4632 vrf_id); 4633 } else { 4634 ret = -1; 4635 } 4636 *offset = length; 4637 if (abort_no_unlock) { 4638 return (NULL); 4639 } 4640 /* 4641 * Special case, I must call the output routine to 4642 * get the cookie echoed 4643 */ 4644 if ((stcb != NULL) && (ret == 0)) { 4645 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 4646 } 4647 return (stcb); 4648 break; 4649 case SCTP_SELECTIVE_ACK: 4650 case SCTP_NR_SELECTIVE_ACK: 4651 { 4652 int abort_now = 0; 4653 uint32_t a_rwnd, cum_ack; 4654 uint16_t num_seg, num_nr_seg, num_dup; 4655 uint8_t flags; 4656 int offset_seg, offset_dup; 4657 4658 SCTPDBG(SCTP_DEBUG_INPUT3, "%s\n", 4659 ch->chunk_type == SCTP_SELECTIVE_ACK ? "SCTP_SACK" : "SCTP_NR_SACK"); 4660 SCTP_STAT_INCR(sctps_recvsacks); 4661 if (stcb == NULL) { 4662 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing %s chunk\n", 4663 (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK"); 4664 break; 4665 } 4666 if (ch->chunk_type == SCTP_SELECTIVE_ACK) { 4667 if (chk_length < sizeof(struct sctp_sack_chunk)) { 4668 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n"); 4669 break; 4670 } 4671 } else { 4672 if (stcb->asoc.nrsack_supported == 0) { 4673 goto unknown_chunk; 4674 } 4675 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) { 4676 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR_SACK chunk, too small\n"); 4677 break; 4678 } 4679 } 4680 if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4681 /*- 4682 * If we have sent a shutdown-ack, we will pay no 4683 * attention to a sack sent in to us since 4684 * we don't care anymore. 4685 */ 4686 break; 4687 } 4688 flags = ch->chunk_flags; 4689 if (ch->chunk_type == SCTP_SELECTIVE_ACK) { 4690 struct sctp_sack_chunk *sack; 4691 4692 sack = (struct sctp_sack_chunk *)ch; 4693 cum_ack = ntohl(sack->sack.cum_tsn_ack); 4694 num_seg = ntohs(sack->sack.num_gap_ack_blks); 4695 num_nr_seg = 0; 4696 num_dup = ntohs(sack->sack.num_dup_tsns); 4697 a_rwnd = ntohl(sack->sack.a_rwnd); 4698 if (sizeof(struct sctp_sack_chunk) + 4699 num_seg * sizeof(struct sctp_gap_ack_block) + 4700 num_dup * sizeof(uint32_t) != chk_length) { 4701 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n"); 4702 break; 4703 } 4704 offset_seg = *offset + sizeof(struct sctp_sack_chunk); 4705 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 4706 } else { 4707 struct sctp_nr_sack_chunk *nr_sack; 4708 4709 nr_sack = (struct sctp_nr_sack_chunk *)ch; 4710 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack); 4711 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks); 4712 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks); 4713 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns); 4714 a_rwnd = ntohl(nr_sack->nr_sack.a_rwnd); 4715 if (sizeof(struct sctp_nr_sack_chunk) + 4716 (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) + 4717 num_dup * sizeof(uint32_t) != chk_length) { 4718 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n"); 4719 break; 4720 } 4721 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk); 4722 offset_dup = offset_seg + (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block); 4723 } 4724 SCTPDBG(SCTP_DEBUG_INPUT3, "%s process cum_ack:%x num_seg:%d a_rwnd:%d\n", 4725 (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK", 4726 cum_ack, num_seg, a_rwnd); 4727 stcb->asoc.seen_a_sack_this_pkt = 1; 4728 if ((stcb->asoc.pr_sctp_cnt == 0) && 4729 (num_seg == 0) && (num_nr_seg == 0) && 4730 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 4731 (stcb->asoc.saw_sack_with_frags == 0) && 4732 (stcb->asoc.saw_sack_with_nr_frags == 0) && 4733 (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) { 4734 /* 4735 * We have a SIMPLE sack having no 4736 * prior segments and data on sent 4737 * queue to be acked. Use the faster 4738 * path sack processing. We also 4739 * allow window update sacks with no 4740 * missing segments to go this way 4741 * too. 4742 */ 4743 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, 4744 &abort_now, ecne_seen); 4745 } else { 4746 if ((netp != NULL) && (*netp != NULL)) { 4747 sctp_handle_sack(m, offset_seg, offset_dup, stcb, 4748 num_seg, num_nr_seg, num_dup, &abort_now, flags, 4749 cum_ack, a_rwnd, ecne_seen); 4750 } 4751 } 4752 if (abort_now) { 4753 /* ABORT signal from sack processing */ 4754 *offset = length; 4755 return (NULL); 4756 } 4757 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 4758 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 4759 (stcb->asoc.stream_queue_cnt == 0)) { 4760 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 4761 } 4762 break; 4763 } 4764 case SCTP_HEARTBEAT_REQUEST: 4765 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n"); 4766 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 4767 SCTP_STAT_INCR(sctps_recvheartbeat); 4768 sctp_send_heartbeat_ack(stcb, m, *offset, 4769 chk_length, *netp); 4770 } 4771 break; 4772 case SCTP_HEARTBEAT_ACK: 4773 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT_ACK\n"); 4774 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) { 4775 /* Its not ours */ 4776 *offset = length; 4777 return (stcb); 4778 } 4779 SCTP_STAT_INCR(sctps_recvheartbeatack); 4780 if ((netp != NULL) && (*netp != NULL)) { 4781 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch, 4782 stcb, *netp); 4783 } 4784 break; 4785 case SCTP_ABORT_ASSOCIATION: 4786 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n", 4787 (void *)stcb); 4788 *offset = length; 4789 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 4790 if (sctp_handle_abort((struct sctp_abort_chunk *)ch, stcb, *netp)) { 4791 return (NULL); 4792 } else { 4793 return (stcb); 4794 } 4795 } else { 4796 return (NULL); 4797 } 4798 break; 4799 case SCTP_SHUTDOWN: 4800 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n", 4801 (void *)stcb); 4802 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) { 4803 *offset = length; 4804 return (stcb); 4805 } 4806 if ((netp != NULL) && (*netp != NULL)) { 4807 int abort_flag = 0; 4808 4809 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch, 4810 stcb, *netp, &abort_flag); 4811 if (abort_flag) { 4812 *offset = length; 4813 return (NULL); 4814 } 4815 } 4816 break; 4817 case SCTP_SHUTDOWN_ACK: 4818 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_ACK, stcb %p\n", (void *)stcb); 4819 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 4820 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp); 4821 } 4822 *offset = length; 4823 return (NULL); 4824 break; 4825 case SCTP_OPERATION_ERROR: 4826 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP_ERR\n"); 4827 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL) && 4828 sctp_handle_error(ch, stcb, *netp, contiguous) < 0) { 4829 *offset = length; 4830 return (NULL); 4831 } 4832 break; 4833 case SCTP_COOKIE_ECHO: 4834 SCTPDBG(SCTP_DEBUG_INPUT3, 4835 "SCTP_COOKIE_ECHO, stcb %p\n", (void *)stcb); 4836 if ((stcb != NULL) && (stcb->asoc.total_output_queue_size > 0)) { 4837 ; 4838 } else { 4839 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4840 /* We are not interested anymore */ 4841 abend: 4842 if (stcb != NULL) { 4843 SCTP_TCB_UNLOCK(stcb); 4844 } 4845 *offset = length; 4846 return (NULL); 4847 } 4848 } 4849 /*- 4850 * First are we accepting? We do this again here 4851 * since it is possible that a previous endpoint WAS 4852 * listening responded to a INIT-ACK and then 4853 * closed. We opened and bound.. and are now no 4854 * longer listening. 4855 * 4856 * XXXGL: notes on checking listen queue length. 4857 * 1) SCTP_IS_LISTENING() doesn't necessarily mean 4858 * SOLISTENING(), because a listening "UDP type" 4859 * socket isn't listening in terms of the socket 4860 * layer. It is a normal data flow socket, that 4861 * can fork off new connections. Thus, we should 4862 * look into sol_qlen only in case we are !UDP. 4863 * 2) Checking sol_qlen in general requires locking 4864 * the socket, and this code lacks that. 4865 */ 4866 if ((stcb == NULL) && 4867 (!SCTP_IS_LISTENING(inp) || 4868 (!(inp->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE) && 4869 inp->sctp_socket->sol_qlen >= inp->sctp_socket->sol_qlimit))) { 4870 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 4871 (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) { 4872 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 4873 sctp_abort_association(inp, stcb, m, iphlen, 4874 src, dst, sh, op_err, 4875 mflowtype, mflowid, 4876 vrf_id, port); 4877 } 4878 *offset = length; 4879 return (NULL); 4880 } else { 4881 struct mbuf *ret_buf; 4882 struct sctp_inpcb *linp; 4883 struct sctp_tmit_chunk *chk; 4884 4885 if (stcb) { 4886 linp = NULL; 4887 } else { 4888 linp = inp; 4889 } 4890 4891 if (linp != NULL) { 4892 SCTP_ASOC_CREATE_LOCK(linp); 4893 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 4894 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) { 4895 SCTP_ASOC_CREATE_UNLOCK(linp); 4896 goto abend; 4897 } 4898 } 4899 4900 if (netp != NULL) { 4901 struct sctp_tcb *locked_stcb; 4902 4903 locked_stcb = stcb; 4904 ret_buf = 4905 sctp_handle_cookie_echo(m, iphlen, 4906 *offset, 4907 src, dst, 4908 sh, 4909 (struct sctp_cookie_echo_chunk *)ch, 4910 &inp, &stcb, netp, 4911 auth_skipped, 4912 auth_offset, 4913 auth_len, 4914 &locked_stcb, 4915 mflowtype, 4916 mflowid, 4917 vrf_id, 4918 port); 4919 if ((locked_stcb != NULL) && (locked_stcb != stcb)) { 4920 SCTP_TCB_UNLOCK(locked_stcb); 4921 } 4922 if (stcb != NULL) { 4923 SCTP_TCB_LOCK_ASSERT(stcb); 4924 } 4925 } else { 4926 ret_buf = NULL; 4927 } 4928 if (linp != NULL) { 4929 SCTP_ASOC_CREATE_UNLOCK(linp); 4930 } 4931 if (ret_buf == NULL) { 4932 if (stcb != NULL) { 4933 SCTP_TCB_UNLOCK(stcb); 4934 } 4935 SCTPDBG(SCTP_DEBUG_INPUT3, 4936 "GAK, null buffer\n"); 4937 *offset = length; 4938 return (NULL); 4939 } 4940 /* if AUTH skipped, see if it verified... */ 4941 if (auth_skipped) { 4942 got_auth = 1; 4943 auth_skipped = 0; 4944 } 4945 /* Restart the timer if we have pending data */ 4946 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 4947 if (chk->whoTo != NULL) { 4948 break; 4949 } 4950 } 4951 if (chk != NULL) { 4952 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 4953 } 4954 } 4955 break; 4956 case SCTP_COOKIE_ACK: 4957 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE_ACK, stcb %p\n", (void *)stcb); 4958 if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) { 4959 return (stcb); 4960 } 4961 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4962 /* We are not interested anymore */ 4963 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4964 ; 4965 } else if (stcb) { 4966 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 4967 SCTP_FROM_SCTP_INPUT + SCTP_LOC_30); 4968 *offset = length; 4969 return (NULL); 4970 } 4971 } 4972 if ((netp != NULL) && (*netp != NULL)) { 4973 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp); 4974 } 4975 break; 4976 case SCTP_ECN_ECHO: 4977 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_ECHO\n"); 4978 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) { 4979 /* Its not ours */ 4980 *offset = length; 4981 return (stcb); 4982 } 4983 if (stcb->asoc.ecn_supported == 0) { 4984 goto unknown_chunk; 4985 } 4986 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, stcb); 4987 ecne_seen = 1; 4988 break; 4989 case SCTP_ECN_CWR: 4990 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_CWR\n"); 4991 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) { 4992 *offset = length; 4993 return (stcb); 4994 } 4995 if (stcb->asoc.ecn_supported == 0) { 4996 goto unknown_chunk; 4997 } 4998 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp); 4999 break; 5000 case SCTP_SHUTDOWN_COMPLETE: 5001 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_COMPLETE, stcb %p\n", (void *)stcb); 5002 /* must be first and only chunk */ 5003 if ((num_chunks > 1) || 5004 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 5005 *offset = length; 5006 return (stcb); 5007 } 5008 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 5009 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch, 5010 stcb, *netp); 5011 } 5012 *offset = length; 5013 return (NULL); 5014 break; 5015 case SCTP_ASCONF: 5016 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n"); 5017 if (stcb != NULL) { 5018 if (stcb->asoc.asconf_supported == 0) { 5019 goto unknown_chunk; 5020 } 5021 sctp_handle_asconf(m, *offset, src, 5022 (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0); 5023 asconf_cnt++; 5024 } 5025 break; 5026 case SCTP_ASCONF_ACK: 5027 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF_ACK\n"); 5028 if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) { 5029 /* Its not ours */ 5030 *offset = length; 5031 return (stcb); 5032 } 5033 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 5034 if (stcb->asoc.asconf_supported == 0) { 5035 goto unknown_chunk; 5036 } 5037 /* He's alive so give him credit */ 5038 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5039 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5040 stcb->asoc.overall_error_count, 5041 0, 5042 SCTP_FROM_SCTP_INPUT, 5043 __LINE__); 5044 } 5045 stcb->asoc.overall_error_count = 0; 5046 sctp_handle_asconf_ack(m, *offset, 5047 (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock); 5048 if (abort_no_unlock) 5049 return (NULL); 5050 } 5051 break; 5052 case SCTP_FORWARD_CUM_TSN: 5053 case SCTP_IFORWARD_CUM_TSN: 5054 SCTPDBG(SCTP_DEBUG_INPUT3, "%s\n", 5055 ch->chunk_type == SCTP_FORWARD_CUM_TSN ? "FORWARD_TSN" : "I_FORWARD_TSN"); 5056 if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) { 5057 /* Its not ours */ 5058 *offset = length; 5059 return (stcb); 5060 } 5061 5062 if (stcb != NULL) { 5063 int abort_flag = 0; 5064 5065 if (stcb->asoc.prsctp_supported == 0) { 5066 goto unknown_chunk; 5067 } 5068 if (((stcb->asoc.idata_supported == 1) && (ch->chunk_type == SCTP_FORWARD_CUM_TSN)) || 5069 ((stcb->asoc.idata_supported == 0) && (ch->chunk_type == SCTP_IFORWARD_CUM_TSN))) { 5070 if (ch->chunk_type == SCTP_FORWARD_CUM_TSN) { 5071 SCTP_SNPRINTF(msg, sizeof(msg), "%s", "FORWARD-TSN chunk received when I-FORWARD-TSN was negotiated"); 5072 } else { 5073 SCTP_SNPRINTF(msg, sizeof(msg), "%s", "I-FORWARD-TSN chunk received when FORWARD-TSN was negotiated"); 5074 } 5075 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); 5076 sctp_abort_an_association(inp, stcb, op_err, SCTP_SO_NOT_LOCKED); 5077 *offset = length; 5078 return (NULL); 5079 } 5080 *fwd_tsn_seen = 1; 5081 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5082 /* We are not interested anymore */ 5083 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 5084 SCTP_FROM_SCTP_INPUT + SCTP_LOC_31); 5085 *offset = length; 5086 return (NULL); 5087 } 5088 /* 5089 * For sending a SACK this looks like DATA 5090 * chunks. 5091 */ 5092 stcb->asoc.last_data_chunk_from = stcb->asoc.last_control_chunk_from; 5093 sctp_handle_forward_tsn(stcb, 5094 (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset); 5095 if (abort_flag) { 5096 *offset = length; 5097 return (NULL); 5098 } 5099 } 5100 break; 5101 case SCTP_STREAM_RESET: 5102 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n"); 5103 if ((stcb == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req))) { 5104 /* Its not ours */ 5105 *offset = length; 5106 return (stcb); 5107 } 5108 if (stcb->asoc.reconfig_supported == 0) { 5109 goto unknown_chunk; 5110 } 5111 if (sctp_handle_stream_reset(stcb, m, *offset, ch)) { 5112 /* stop processing */ 5113 *offset = length; 5114 return (NULL); 5115 } 5116 break; 5117 case SCTP_PACKET_DROPPED: 5118 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n"); 5119 /* re-get it all please */ 5120 if (chk_length < sizeof(struct sctp_pktdrop_chunk)) { 5121 /* Its not ours */ 5122 *offset = length; 5123 return (stcb); 5124 } 5125 5126 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 5127 if (stcb->asoc.pktdrop_supported == 0) { 5128 goto unknown_chunk; 5129 } 5130 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch, 5131 stcb, *netp, 5132 min(chk_length, contiguous)); 5133 } 5134 break; 5135 case SCTP_AUTHENTICATION: 5136 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n"); 5137 if (stcb == NULL) { 5138 /* save the first AUTH for later processing */ 5139 if (auth_skipped == 0) { 5140 auth_offset = *offset; 5141 auth_len = chk_length; 5142 auth_skipped = 1; 5143 } 5144 /* skip this chunk (temporarily) */ 5145 goto next_chunk; 5146 } 5147 if (stcb->asoc.auth_supported == 0) { 5148 goto unknown_chunk; 5149 } 5150 if ((chk_length < (sizeof(struct sctp_auth_chunk))) || 5151 (chk_length > (sizeof(struct sctp_auth_chunk) + 5152 SCTP_AUTH_DIGEST_LEN_MAX))) { 5153 /* Its not ours */ 5154 *offset = length; 5155 return (stcb); 5156 } 5157 if (got_auth == 1) { 5158 /* skip this chunk... it's already auth'd */ 5159 goto next_chunk; 5160 } 5161 got_auth = 1; 5162 if (sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch, m, *offset)) { 5163 /* auth HMAC failed so dump the packet */ 5164 *offset = length; 5165 return (stcb); 5166 } else { 5167 /* remaining chunks are HMAC checked */ 5168 stcb->asoc.authenticated = 1; 5169 } 5170 break; 5171 5172 default: 5173 unknown_chunk: 5174 /* it's an unknown chunk! */ 5175 if ((ch->chunk_type & 0x40) && 5176 (stcb != NULL) && 5177 (SCTP_GET_STATE(stcb) != SCTP_STATE_EMPTY) && 5178 (SCTP_GET_STATE(stcb) != SCTP_STATE_INUSE) && 5179 (SCTP_GET_STATE(stcb) != SCTP_STATE_COOKIE_WAIT)) { 5180 struct sctp_gen_error_cause *cause; 5181 int len; 5182 5183 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_gen_error_cause), 5184 0, M_NOWAIT, 1, MT_DATA); 5185 if (op_err != NULL) { 5186 len = min(SCTP_SIZE32(chk_length), (uint32_t)(length - *offset)); 5187 cause = mtod(op_err, struct sctp_gen_error_cause *); 5188 cause->code = htons(SCTP_CAUSE_UNRECOG_CHUNK); 5189 cause->length = htons((uint16_t)(len + sizeof(struct sctp_gen_error_cause))); 5190 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_gen_error_cause); 5191 SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(m, *offset, len, M_NOWAIT); 5192 if (SCTP_BUF_NEXT(op_err) != NULL) { 5193 #ifdef SCTP_MBUF_LOGGING 5194 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5195 sctp_log_mbc(SCTP_BUF_NEXT(op_err), SCTP_MBUF_ICOPY); 5196 } 5197 #endif 5198 sctp_queue_op_err(stcb, op_err); 5199 } else { 5200 sctp_m_freem(op_err); 5201 } 5202 } 5203 } 5204 if ((ch->chunk_type & 0x80) == 0) { 5205 /* discard this packet */ 5206 *offset = length; 5207 return (stcb); 5208 } /* else skip this bad chunk and continue... */ 5209 break; 5210 } /* switch (ch->chunk_type) */ 5211 5212 next_chunk: 5213 /* get the next chunk */ 5214 *offset += SCTP_SIZE32(chk_length); 5215 if (*offset >= length) { 5216 /* no more data left in the mbuf chain */ 5217 break; 5218 } 5219 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 5220 sizeof(struct sctp_chunkhdr), chunk_buf); 5221 if (ch == NULL) { 5222 *offset = length; 5223 return (stcb); 5224 } 5225 } /* while */ 5226 5227 if ((asconf_cnt > 0) && (stcb != NULL)) { 5228 sctp_send_asconf_ack(stcb); 5229 } 5230 return (stcb); 5231 } 5232 5233 /* 5234 * common input chunk processing (v4 and v6) 5235 */ 5236 void 5237 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length, 5238 struct sockaddr *src, struct sockaddr *dst, 5239 struct sctphdr *sh, struct sctp_chunkhdr *ch, 5240 uint8_t compute_crc, 5241 uint8_t ecn_bits, 5242 uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum, 5243 uint32_t vrf_id, uint16_t port) 5244 { 5245 uint32_t high_tsn; 5246 int fwd_tsn_seen = 0, data_processed = 0; 5247 struct mbuf *m = *mm, *op_err; 5248 char msg[SCTP_DIAG_INFO_LEN]; 5249 int un_sent; 5250 int cnt_ctrl_ready = 0; 5251 struct sctp_inpcb *inp = NULL, *inp_decr = NULL; 5252 struct sctp_tcb *stcb = NULL; 5253 struct sctp_nets *net = NULL; 5254 5255 SCTP_STAT_INCR(sctps_recvdatagrams); 5256 #ifdef SCTP_AUDITING_ENABLED 5257 sctp_audit_log(0xE0, 1); 5258 sctp_auditing(0, inp, stcb, net); 5259 #endif 5260 if (compute_crc != 0) { 5261 uint32_t check, calc_check; 5262 5263 check = sh->checksum; 5264 sh->checksum = 0; 5265 calc_check = sctp_calculate_cksum(m, iphlen); 5266 sh->checksum = check; 5267 if (calc_check != check) { 5268 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x m:%p mlen:%d iphlen:%d\n", 5269 calc_check, check, (void *)m, length, iphlen); 5270 stcb = sctp_findassociation_addr(m, offset, src, dst, 5271 sh, ch, &inp, &net, vrf_id); 5272 #if defined(INET) || defined(INET6) 5273 if ((ch->chunk_type != SCTP_INITIATION) && 5274 (net != NULL) && (net->port != port)) { 5275 if (net->port == 0) { 5276 /* UDP encapsulation turned on. */ 5277 net->mtu -= sizeof(struct udphdr); 5278 if (stcb->asoc.smallest_mtu > net->mtu) { 5279 sctp_pathmtu_adjustment(stcb, net->mtu); 5280 } 5281 } else if (port == 0) { 5282 /* UDP encapsulation turned off. */ 5283 net->mtu += sizeof(struct udphdr); 5284 /* XXX Update smallest_mtu */ 5285 } 5286 net->port = port; 5287 } 5288 #endif 5289 if (net != NULL) { 5290 net->flowtype = mflowtype; 5291 net->flowid = mflowid; 5292 } 5293 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5294 if ((inp != NULL) && (stcb != NULL)) { 5295 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1); 5296 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED); 5297 } else if ((inp != NULL) && (stcb == NULL)) { 5298 inp_decr = inp; 5299 } 5300 SCTP_STAT_INCR(sctps_badsum); 5301 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors); 5302 goto out; 5303 } 5304 } 5305 /* Destination port of 0 is illegal, based on RFC4960. */ 5306 if (sh->dest_port == 0) { 5307 SCTP_STAT_INCR(sctps_hdrops); 5308 goto out; 5309 } 5310 stcb = sctp_findassociation_addr(m, offset, src, dst, 5311 sh, ch, &inp, &net, vrf_id); 5312 #if defined(INET) || defined(INET6) 5313 if ((ch->chunk_type != SCTP_INITIATION) && 5314 (net != NULL) && (net->port != port)) { 5315 if (net->port == 0) { 5316 /* UDP encapsulation turned on. */ 5317 net->mtu -= sizeof(struct udphdr); 5318 if (stcb->asoc.smallest_mtu > net->mtu) { 5319 sctp_pathmtu_adjustment(stcb, net->mtu); 5320 } 5321 } else if (port == 0) { 5322 /* UDP encapsulation turned off. */ 5323 net->mtu += sizeof(struct udphdr); 5324 /* XXX Update smallest_mtu */ 5325 } 5326 net->port = port; 5327 } 5328 #endif 5329 if (net != NULL) { 5330 net->flowtype = mflowtype; 5331 net->flowid = mflowid; 5332 } 5333 if (inp == NULL) { 5334 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5335 SCTP_STAT_INCR(sctps_noport); 5336 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) { 5337 goto out; 5338 } 5339 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 5340 sctp_send_shutdown_complete2(src, dst, sh, 5341 mflowtype, mflowid, fibnum, 5342 vrf_id, port); 5343 goto out; 5344 } 5345 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) { 5346 goto out; 5347 } 5348 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) { 5349 if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) || 5350 ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) && 5351 (ch->chunk_type != SCTP_INIT))) { 5352 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5353 "Out of the blue"); 5354 sctp_send_abort(m, iphlen, src, dst, 5355 sh, 0, op_err, 5356 mflowtype, mflowid, fibnum, 5357 vrf_id, port); 5358 } 5359 } 5360 goto out; 5361 } else if (stcb == NULL) { 5362 inp_decr = inp; 5363 } 5364 SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n", 5365 (void *)m, iphlen, offset, length, (void *)stcb); 5366 if (stcb) { 5367 /* always clear this before beginning a packet */ 5368 stcb->asoc.authenticated = 0; 5369 stcb->asoc.seen_a_sack_this_pkt = 0; 5370 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n", 5371 (void *)stcb, stcb->asoc.state); 5372 5373 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) || 5374 (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) { 5375 /*- 5376 * If we hit here, we had a ref count 5377 * up when the assoc was aborted and the 5378 * timer is clearing out the assoc, we should 5379 * NOT respond to any packet.. its OOTB. 5380 */ 5381 SCTP_TCB_UNLOCK(stcb); 5382 stcb = NULL; 5383 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5384 SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5385 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5386 msg); 5387 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5388 mflowtype, mflowid, inp->fibnum, 5389 vrf_id, port); 5390 goto out; 5391 } 5392 } 5393 if (IS_SCTP_CONTROL(ch)) { 5394 /* process the control portion of the SCTP packet */ 5395 /* sa_ignore NO_NULL_CHK */ 5396 stcb = sctp_process_control(m, iphlen, &offset, length, 5397 src, dst, sh, ch, 5398 inp, stcb, &net, &fwd_tsn_seen, 5399 mflowtype, mflowid, fibnum, 5400 vrf_id, port); 5401 if (stcb) { 5402 /* 5403 * This covers us if the cookie-echo was there and 5404 * it changes our INP. 5405 */ 5406 inp = stcb->sctp_ep; 5407 #if defined(INET) || defined(INET6) 5408 if ((ch->chunk_type != SCTP_INITIATION) && 5409 (net != NULL) && (net->port != port)) { 5410 if (net->port == 0) { 5411 /* UDP encapsulation turned on. */ 5412 net->mtu -= sizeof(struct udphdr); 5413 if (stcb->asoc.smallest_mtu > net->mtu) { 5414 sctp_pathmtu_adjustment(stcb, net->mtu); 5415 } 5416 } else if (port == 0) { 5417 /* UDP encapsulation turned off. */ 5418 net->mtu += sizeof(struct udphdr); 5419 /* XXX Update smallest_mtu */ 5420 } 5421 net->port = port; 5422 } 5423 #endif 5424 } 5425 } else { 5426 /* 5427 * no control chunks, so pre-process DATA chunks (these 5428 * checks are taken care of by control processing) 5429 */ 5430 5431 /* 5432 * if DATA only packet, and auth is required, then punt... 5433 * can't have authenticated without any AUTH (control) 5434 * chunks 5435 */ 5436 if ((stcb != NULL) && 5437 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) { 5438 /* "silently" ignore */ 5439 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5440 SCTP_STAT_INCR(sctps_recvauthmissing); 5441 goto out; 5442 } 5443 if (stcb == NULL) { 5444 /* out of the blue DATA chunk */ 5445 SCTP_PROBE5(receive, NULL, NULL, m, NULL, sh); 5446 SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5447 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5448 msg); 5449 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5450 mflowtype, mflowid, fibnum, 5451 vrf_id, port); 5452 goto out; 5453 } 5454 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) { 5455 /* v_tag mismatch! */ 5456 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5457 SCTP_STAT_INCR(sctps_badvtag); 5458 goto out; 5459 } 5460 } 5461 5462 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5463 if (stcb == NULL) { 5464 /* 5465 * no valid TCB for this packet, or we found it's a bad 5466 * packet while processing control, or we're done with this 5467 * packet (done or skip rest of data), so we drop it... 5468 */ 5469 goto out; 5470 } 5471 5472 /* 5473 * DATA chunk processing 5474 */ 5475 /* plow through the data chunks while length > offset */ 5476 5477 /* 5478 * Rest should be DATA only. Check authentication state if AUTH for 5479 * DATA is required. 5480 */ 5481 if ((length > offset) && 5482 (stcb != NULL) && 5483 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) && 5484 !stcb->asoc.authenticated) { 5485 /* "silently" ignore */ 5486 SCTP_STAT_INCR(sctps_recvauthmissing); 5487 SCTPDBG(SCTP_DEBUG_AUTH1, 5488 "Data chunk requires AUTH, skipped\n"); 5489 goto trigger_send; 5490 } 5491 if (length > offset) { 5492 int retval; 5493 5494 /* 5495 * First check to make sure our state is correct. We would 5496 * not get here unless we really did have a tag, so we don't 5497 * abort if this happens, just dump the chunk silently. 5498 */ 5499 switch (SCTP_GET_STATE(stcb)) { 5500 case SCTP_STATE_COOKIE_ECHOED: 5501 /* 5502 * we consider data with valid tags in this state 5503 * shows us the cookie-ack was lost. Imply it was 5504 * there. 5505 */ 5506 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net); 5507 break; 5508 case SCTP_STATE_COOKIE_WAIT: 5509 /* 5510 * We consider OOTB any data sent during asoc setup. 5511 */ 5512 SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5513 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5514 msg); 5515 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5516 mflowtype, mflowid, inp->fibnum, 5517 vrf_id, port); 5518 goto out; 5519 /* sa_ignore NOTREACHED */ 5520 break; 5521 case SCTP_STATE_EMPTY: /* should not happen */ 5522 case SCTP_STATE_INUSE: /* should not happen */ 5523 case SCTP_STATE_SHUTDOWN_RECEIVED: /* This is a peer error */ 5524 case SCTP_STATE_SHUTDOWN_ACK_SENT: 5525 default: 5526 goto out; 5527 /* sa_ignore NOTREACHED */ 5528 break; 5529 case SCTP_STATE_OPEN: 5530 case SCTP_STATE_SHUTDOWN_SENT: 5531 break; 5532 } 5533 /* plow through the data chunks while length > offset */ 5534 retval = sctp_process_data(mm, iphlen, &offset, length, 5535 inp, stcb, net, &high_tsn); 5536 if (retval == 2) { 5537 /* 5538 * The association aborted, NO UNLOCK needed since 5539 * the association is destroyed. 5540 */ 5541 stcb = NULL; 5542 goto out; 5543 } 5544 if (retval == 0) { 5545 data_processed = 1; 5546 } 5547 /* 5548 * Anything important needs to have been m_copy'ed in 5549 * process_data 5550 */ 5551 } 5552 5553 /* take care of ecn */ 5554 if ((data_processed == 1) && 5555 (stcb->asoc.ecn_supported == 1) && 5556 ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) { 5557 /* Yep, we need to add a ECNE */ 5558 sctp_send_ecn_echo(stcb, net, high_tsn); 5559 } 5560 5561 if ((data_processed == 0) && (fwd_tsn_seen)) { 5562 int was_a_gap; 5563 uint32_t highest_tsn; 5564 5565 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) { 5566 highest_tsn = stcb->asoc.highest_tsn_inside_nr_map; 5567 } else { 5568 highest_tsn = stcb->asoc.highest_tsn_inside_map; 5569 } 5570 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn); 5571 stcb->asoc.send_sack = 1; 5572 sctp_sack_check(stcb, was_a_gap); 5573 } else if (fwd_tsn_seen) { 5574 stcb->asoc.send_sack = 1; 5575 } 5576 /* trigger send of any chunks in queue... */ 5577 trigger_send: 5578 #ifdef SCTP_AUDITING_ENABLED 5579 sctp_audit_log(0xE0, 2); 5580 sctp_auditing(1, inp, stcb, net); 5581 #endif 5582 SCTPDBG(SCTP_DEBUG_INPUT1, 5583 "Check for chunk output prw:%d tqe:%d tf=%d\n", 5584 stcb->asoc.peers_rwnd, 5585 TAILQ_EMPTY(&stcb->asoc.control_send_queue), 5586 stcb->asoc.total_flight); 5587 un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight); 5588 if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 5589 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq; 5590 } 5591 if (!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue) || 5592 cnt_ctrl_ready || 5593 stcb->asoc.trigger_reset || 5594 ((un_sent > 0) && 5595 (stcb->asoc.peers_rwnd > 0 || stcb->asoc.total_flight == 0))) { 5596 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n"); 5597 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 5598 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n"); 5599 } 5600 #ifdef SCTP_AUDITING_ENABLED 5601 sctp_audit_log(0xE0, 3); 5602 sctp_auditing(2, inp, stcb, net); 5603 #endif 5604 out: 5605 if (stcb != NULL) { 5606 SCTP_TCB_UNLOCK(stcb); 5607 } 5608 if (inp_decr != NULL) { 5609 /* reduce ref-count */ 5610 SCTP_INP_WLOCK(inp_decr); 5611 SCTP_INP_DECR_REF(inp_decr); 5612 SCTP_INP_WUNLOCK(inp_decr); 5613 } 5614 return; 5615 } 5616 5617 #ifdef INET 5618 void 5619 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port) 5620 { 5621 struct mbuf *m; 5622 int iphlen; 5623 uint32_t vrf_id = 0; 5624 uint8_t ecn_bits; 5625 struct sockaddr_in src, dst; 5626 struct ip *ip; 5627 struct sctphdr *sh; 5628 struct sctp_chunkhdr *ch; 5629 int length, offset; 5630 uint8_t compute_crc; 5631 uint32_t mflowid; 5632 uint8_t mflowtype; 5633 uint16_t fibnum; 5634 5635 iphlen = off; 5636 if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) { 5637 SCTP_RELEASE_PKT(i_pak); 5638 return; 5639 } 5640 m = SCTP_HEADER_TO_CHAIN(i_pak); 5641 #ifdef SCTP_MBUF_LOGGING 5642 /* Log in any input mbufs */ 5643 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5644 sctp_log_mbc(m, SCTP_MBUF_INPUT); 5645 } 5646 #endif 5647 #ifdef SCTP_PACKET_LOGGING 5648 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) { 5649 sctp_packet_log(m); 5650 } 5651 #endif 5652 SCTPDBG(SCTP_DEBUG_CRCOFFLOAD, 5653 "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n", 5654 m->m_pkthdr.len, 5655 if_name(m->m_pkthdr.rcvif), 5656 (int)m->m_pkthdr.csum_flags, CSUM_BITS); 5657 mflowid = m->m_pkthdr.flowid; 5658 mflowtype = M_HASHTYPE_GET(m); 5659 fibnum = M_GETFIB(m); 5660 SCTP_STAT_INCR(sctps_recvpackets); 5661 SCTP_STAT_INCR_COUNTER64(sctps_inpackets); 5662 /* Get IP, SCTP, and first chunk header together in the first mbuf. */ 5663 offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr); 5664 if (SCTP_BUF_LEN(m) < offset) { 5665 if ((m = m_pullup(m, offset)) == NULL) { 5666 SCTP_STAT_INCR(sctps_hdrops); 5667 return; 5668 } 5669 } 5670 ip = mtod(m, struct ip *); 5671 sh = (struct sctphdr *)((caddr_t)ip + iphlen); 5672 ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr)); 5673 offset -= sizeof(struct sctp_chunkhdr); 5674 memset(&src, 0, sizeof(struct sockaddr_in)); 5675 src.sin_family = AF_INET; 5676 src.sin_len = sizeof(struct sockaddr_in); 5677 src.sin_port = sh->src_port; 5678 src.sin_addr = ip->ip_src; 5679 memset(&dst, 0, sizeof(struct sockaddr_in)); 5680 dst.sin_family = AF_INET; 5681 dst.sin_len = sizeof(struct sockaddr_in); 5682 dst.sin_port = sh->dest_port; 5683 dst.sin_addr = ip->ip_dst; 5684 length = ntohs(ip->ip_len); 5685 /* Validate mbuf chain length with IP payload length. */ 5686 if (SCTP_HEADER_LEN(m) != length) { 5687 SCTPDBG(SCTP_DEBUG_INPUT1, 5688 "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m)); 5689 SCTP_STAT_INCR(sctps_hdrops); 5690 goto out; 5691 } 5692 /* SCTP does not allow broadcasts or multicasts */ 5693 if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) { 5694 goto out; 5695 } 5696 if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) { 5697 goto out; 5698 } 5699 ecn_bits = ip->ip_tos; 5700 if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) { 5701 SCTP_STAT_INCR(sctps_recvhwcrc); 5702 compute_crc = 0; 5703 } else { 5704 SCTP_STAT_INCR(sctps_recvswcrc); 5705 compute_crc = 1; 5706 } 5707 sctp_common_input_processing(&m, iphlen, offset, length, 5708 (struct sockaddr *)&src, 5709 (struct sockaddr *)&dst, 5710 sh, ch, 5711 compute_crc, 5712 ecn_bits, 5713 mflowtype, mflowid, fibnum, 5714 vrf_id, port); 5715 out: 5716 if (m) { 5717 sctp_m_freem(m); 5718 } 5719 return; 5720 } 5721 5722 #if defined(SCTP_MCORE_INPUT) && defined(SMP) 5723 extern int *sctp_cpuarry; 5724 #endif 5725 5726 int 5727 sctp_input(struct mbuf **mp, int *offp, int proto SCTP_UNUSED) 5728 { 5729 struct mbuf *m; 5730 int off; 5731 5732 m = *mp; 5733 off = *offp; 5734 #if defined(SCTP_MCORE_INPUT) && defined(SMP) 5735 if (mp_ncpus > 1) { 5736 struct ip *ip; 5737 struct sctphdr *sh; 5738 int offset; 5739 int cpu_to_use; 5740 uint32_t flowid, tag; 5741 5742 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) { 5743 flowid = m->m_pkthdr.flowid; 5744 } else { 5745 /* 5746 * No flow id built by lower layers fix it so we 5747 * create one. 5748 */ 5749 offset = off + sizeof(struct sctphdr); 5750 if (SCTP_BUF_LEN(m) < offset) { 5751 if ((m = m_pullup(m, offset)) == NULL) { 5752 SCTP_STAT_INCR(sctps_hdrops); 5753 return (IPPROTO_DONE); 5754 } 5755 } 5756 ip = mtod(m, struct ip *); 5757 sh = (struct sctphdr *)((caddr_t)ip + off); 5758 tag = htonl(sh->v_tag); 5759 flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port); 5760 m->m_pkthdr.flowid = flowid; 5761 M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE_HASH); 5762 } 5763 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus]; 5764 sctp_queue_to_mcore(m, off, cpu_to_use); 5765 return (IPPROTO_DONE); 5766 } 5767 #endif 5768 sctp_input_with_port(m, off, 0); 5769 return (IPPROTO_DONE); 5770 } 5771 #endif 5772