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, 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 goto outnow; 105 } 106 if ((ntohl(init->a_rwnd) < SCTP_MIN_RWND) || 107 (ntohs(init->num_inbound_streams) == 0) || 108 (ntohs(init->num_outbound_streams) == 0)) { 109 /* protocol error... send abort */ 110 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 111 sctp_send_abort(m, iphlen, src, dst, sh, init->initiate_tag, op_err, 112 mflowtype, mflowid, inp->fibnum, 113 vrf_id, port); 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_send_abort(m, iphlen, src, dst, sh, init->initiate_tag, op_err, 122 mflowtype, mflowid, inp->fibnum, 123 vrf_id, port); 124 goto outnow; 125 } 126 /* We are only accepting if we have a listening socket. */ 127 if ((stcb == NULL) && 128 ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 129 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) || 130 (!SCTP_IS_LISTENING(inp)))) { 131 /* 132 * FIX ME ?? What about TCP model and we have a 133 * match/restart case? Actually no fix is needed. the lookup 134 * will always find the existing assoc so stcb would not be 135 * NULL. It may be questionable to do this since we COULD 136 * just send back the INIT-ACK and hope that the app did 137 * accept()'s by the time the COOKIE was sent. But there is 138 * a price to pay for COOKIE generation and I don't want to 139 * pay it on the chance that the app will actually do some 140 * accepts(). The App just looses and should NOT be in this 141 * state :-) 142 */ 143 if (SCTP_BASE_SYSCTL(sctp_blackhole) == 0) { 144 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 145 "No listener"); 146 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err, 147 mflowtype, mflowid, inp->fibnum, 148 vrf_id, port); 149 } 150 goto outnow; 151 } 152 if ((stcb != NULL) && 153 (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT)) { 154 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending SHUTDOWN-ACK\n"); 155 sctp_send_shutdown_ack(stcb, NULL); 156 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 157 } else { 158 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n"); 159 sctp_send_initiate_ack(inp, stcb, net, m, iphlen, offset, 160 src, dst, sh, cp, 161 mflowtype, mflowid, 162 vrf_id, port); 163 } 164 outnow: 165 if (stcb == NULL) { 166 SCTP_INP_RUNLOCK(inp); 167 } 168 } 169 170 /* 171 * process peer "INIT/INIT-ACK" chunk returns value < 0 on error 172 */ 173 174 int 175 sctp_is_there_unsent_data(struct sctp_tcb *stcb, int so_locked) 176 { 177 int unsent_data; 178 unsigned int i; 179 struct sctp_stream_queue_pending *sp; 180 struct sctp_association *asoc; 181 182 SCTP_TCB_LOCK_ASSERT(stcb); 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 if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 192 /* Check to see if some data queued */ 193 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 194 /* sa_ignore FREED_MEMORY */ 195 sp = TAILQ_FIRST(&stcb->asoc.strmout[i].outqueue); 196 if (sp == NULL) { 197 continue; 198 } 199 if ((sp->msg_is_complete) && 200 (sp->length == 0) && 201 (sp->sender_all_done)) { 202 /* 203 * We are doing differed cleanup. Last time 204 * through when we took all the data the 205 * sender_all_done was not set. 206 */ 207 if (sp->put_last_out == 0) { 208 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n"); 209 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n", 210 sp->sender_all_done, 211 sp->length, 212 sp->msg_is_complete, 213 sp->put_last_out); 214 } 215 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1); 216 TAILQ_REMOVE(&stcb->asoc.strmout[i].outqueue, sp, next); 217 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, &asoc->strmout[i], sp); 218 if (sp->net) { 219 sctp_free_remote_addr(sp->net); 220 sp->net = NULL; 221 } 222 if (sp->data) { 223 sctp_m_freem(sp->data); 224 sp->data = NULL; 225 } 226 sctp_free_a_strmoq(stcb, sp, so_locked); 227 if (!TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) { 228 unsent_data++; 229 } 230 } else { 231 unsent_data++; 232 } 233 if (unsent_data > 0) { 234 break; 235 } 236 } 237 } 238 return (unsent_data); 239 } 240 241 static int 242 sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb) 243 { 244 struct sctp_init *init; 245 struct sctp_association *asoc; 246 struct sctp_nets *lnet; 247 unsigned int i; 248 249 SCTP_TCB_LOCK_ASSERT(stcb); 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 if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) { 269 unsigned int newcnt; 270 struct sctp_stream_out *outs; 271 struct sctp_stream_queue_pending *sp, *nsp; 272 struct sctp_tmit_chunk *chk, *nchk; 273 274 /* abandon the upper streams */ 275 newcnt = ntohs(init->num_inbound_streams); 276 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) { 277 if (chk->rec.data.sid >= newcnt) { 278 TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next); 279 asoc->send_queue_cnt--; 280 if (asoc->strmout[chk->rec.data.sid].chunks_on_queues > 0) { 281 asoc->strmout[chk->rec.data.sid].chunks_on_queues--; 282 #ifdef INVARIANTS 283 } else { 284 panic("No chunks on the queues for sid %u.", chk->rec.data.sid); 285 #endif 286 } 287 if (chk->data != NULL) { 288 sctp_free_bufspace(stcb, asoc, chk, 1); 289 sctp_ulp_notify(SCTP_NOTIFY_UNSENT_DG_FAIL, stcb, 290 0, chk, SCTP_SO_NOT_LOCKED); 291 if (chk->data) { 292 sctp_m_freem(chk->data); 293 chk->data = NULL; 294 } 295 } 296 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 297 /* sa_ignore FREED_MEMORY */ 298 } 299 } 300 if (asoc->strmout) { 301 for (i = newcnt; i < asoc->pre_open_streams; i++) { 302 outs = &asoc->strmout[i]; 303 TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) { 304 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1); 305 TAILQ_REMOVE(&outs->outqueue, sp, next); 306 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, outs, sp); 307 sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL, 308 stcb, 0, sp, SCTP_SO_NOT_LOCKED); 309 if (sp->data) { 310 sctp_m_freem(sp->data); 311 sp->data = NULL; 312 } 313 if (sp->net) { 314 sctp_free_remote_addr(sp->net); 315 sp->net = NULL; 316 } 317 /* Free the chunk */ 318 sctp_free_a_strmoq(stcb, sp, SCTP_SO_NOT_LOCKED); 319 /* sa_ignore FREED_MEMORY */ 320 } 321 outs->state = SCTP_STREAM_CLOSED; 322 } 323 } 324 /* cut back the count */ 325 asoc->pre_open_streams = newcnt; 326 } 327 asoc->streamoutcnt = asoc->pre_open_streams; 328 if (asoc->strmout) { 329 for (i = 0; i < asoc->streamoutcnt; i++) { 330 asoc->strmout[i].state = SCTP_STREAM_OPEN; 331 } 332 } 333 /* EY - nr_sack: initialize highest tsn in nr_mapping_array */ 334 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 335 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 336 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 337 } 338 /* This is the next one we expect */ 339 asoc->str_reset_seq_in = asoc->asconf_seq_in + 1; 340 341 asoc->mapping_array_base_tsn = ntohl(init->initial_tsn); 342 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in; 343 344 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 345 /* open the requested streams */ 346 347 if (asoc->strmin != NULL) { 348 /* Free the old ones */ 349 for (i = 0; i < asoc->streamincnt; i++) { 350 sctp_clean_up_stream(stcb, &asoc->strmin[i].inqueue); 351 sctp_clean_up_stream(stcb, &asoc->strmin[i].uno_inqueue); 352 } 353 SCTP_FREE(asoc->strmin, SCTP_M_STRMI); 354 } 355 if (asoc->max_inbound_streams > ntohs(init->num_outbound_streams)) { 356 asoc->streamincnt = ntohs(init->num_outbound_streams); 357 } else { 358 asoc->streamincnt = asoc->max_inbound_streams; 359 } 360 SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt * 361 sizeof(struct sctp_stream_in), SCTP_M_STRMI); 362 if (asoc->strmin == NULL) { 363 /* we didn't get memory for the streams! */ 364 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n"); 365 return (-1); 366 } 367 for (i = 0; i < asoc->streamincnt; i++) { 368 asoc->strmin[i].sid = i; 369 asoc->strmin[i].last_mid_delivered = 0xffffffff; 370 TAILQ_INIT(&asoc->strmin[i].inqueue); 371 TAILQ_INIT(&asoc->strmin[i].uno_inqueue); 372 asoc->strmin[i].pd_api_started = 0; 373 asoc->strmin[i].delivery_started = 0; 374 } 375 /* 376 * load_address_from_init will put the addresses into the 377 * association when the COOKIE is processed or the INIT-ACK is 378 * processed. Both types of COOKIE's existing and new call this 379 * routine. It will remove addresses that are no longer in the 380 * association (for the restarting case where addresses are 381 * removed). Up front when the INIT arrives we will discard it if it 382 * is a restart and new addresses have been added. 383 */ 384 /* sa_ignore MEMLEAK */ 385 return (0); 386 } 387 388 /* 389 * INIT-ACK message processing/consumption returns value < 0 on error 390 */ 391 static int 392 sctp_process_init_ack(struct mbuf *m, int iphlen, int offset, 393 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 394 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 395 struct sctp_nets *net, int *abort_no_unlock, 396 uint8_t mflowtype, uint32_t mflowid, 397 uint32_t vrf_id) 398 { 399 struct sctp_association *asoc; 400 struct mbuf *op_err; 401 int retval, abort_flag, cookie_found; 402 int initack_limit; 403 int nat_friendly = 0; 404 405 /* First verify that we have no illegal param's */ 406 abort_flag = 0; 407 cookie_found = 0; 408 409 op_err = sctp_arethere_unrecognized_parameters(m, 410 (offset + sizeof(struct sctp_init_chunk)), 411 &abort_flag, (struct sctp_chunkhdr *)cp, 412 &nat_friendly, &cookie_found); 413 if (abort_flag) { 414 /* Send an abort and notify peer */ 415 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, false, SCTP_SO_NOT_LOCKED); 416 *abort_no_unlock = 1; 417 return (-1); 418 } 419 if (!cookie_found) { 420 uint16_t len; 421 422 /* Only report the missing cookie parameter */ 423 if (op_err != NULL) { 424 sctp_m_freem(op_err); 425 } 426 len = (uint16_t)(sizeof(struct sctp_error_missing_param) + sizeof(uint16_t)); 427 /* We abort with an error of missing mandatory param */ 428 op_err = sctp_get_mbuf_for_msg(len, 0, M_NOWAIT, 1, MT_DATA); 429 if (op_err != NULL) { 430 struct sctp_error_missing_param *cause; 431 432 SCTP_BUF_LEN(op_err) = len; 433 cause = mtod(op_err, struct sctp_error_missing_param *); 434 /* Subtract the reserved param */ 435 cause->cause.code = htons(SCTP_CAUSE_MISSING_PARAM); 436 cause->cause.length = htons(len); 437 cause->num_missing_params = htonl(1); 438 cause->type[0] = htons(SCTP_STATE_COOKIE); 439 } 440 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 441 src, dst, sh, op_err, 442 mflowtype, mflowid, 443 vrf_id, net->port); 444 *abort_no_unlock = 1; 445 return (-3); 446 } 447 asoc = &stcb->asoc; 448 asoc->peer_supports_nat = (uint8_t)nat_friendly; 449 /* process the peer's parameters in the INIT-ACK */ 450 if (sctp_process_init((struct sctp_init_chunk *)cp, stcb) < 0) { 451 if (op_err != NULL) { 452 sctp_m_freem(op_err); 453 } 454 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 455 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_init() failed\n"); 456 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 457 src, dst, sh, op_err, 458 mflowtype, mflowid, 459 vrf_id, net->port); 460 *abort_no_unlock = 1; 461 return (-1); 462 } 463 initack_limit = offset + ntohs(cp->ch.chunk_length); 464 /* load all addresses */ 465 if ((retval = sctp_load_addresses_from_init(stcb, m, 466 offset + sizeof(struct sctp_init_chunk), 467 initack_limit, src, dst, NULL, stcb->asoc.port)) < 0) { 468 if (op_err != NULL) { 469 sctp_m_freem(op_err); 470 } 471 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 472 "Problem with address parameters"); 473 SCTPDBG(SCTP_DEBUG_INPUT1, 474 "Load addresses from INIT causes an abort %d\n", 475 retval); 476 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 477 src, dst, sh, op_err, 478 mflowtype, mflowid, 479 vrf_id, net->port); 480 *abort_no_unlock = 1; 481 return (-1); 482 } 483 /* if the peer doesn't support asconf, flush the asconf queue */ 484 if (asoc->asconf_supported == 0) { 485 struct sctp_asconf_addr *param, *nparam; 486 487 TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) { 488 TAILQ_REMOVE(&asoc->asconf_queue, param, next); 489 SCTP_FREE(param, SCTP_M_ASC_ADDR); 490 } 491 } 492 493 stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs, 494 stcb->asoc.local_hmacs); 495 if (op_err) { 496 sctp_queue_op_err(stcb, op_err); 497 /* queuing will steal away the mbuf chain to the out queue */ 498 op_err = NULL; 499 } 500 /* extract the cookie and queue it to "echo" it back... */ 501 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 502 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 503 stcb->asoc.overall_error_count, 504 0, 505 SCTP_FROM_SCTP_INPUT, 506 __LINE__); 507 } 508 stcb->asoc.overall_error_count = 0; 509 net->error_count = 0; 510 511 /* 512 * Cancel the INIT timer, We do this first before queueing the 513 * cookie. We always cancel at the primary to assume that we are 514 * canceling the timer started by the INIT which always goes to the 515 * primary. 516 */ 517 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb, 518 asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3); 519 520 /* calculate the RTO */ 521 sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, 522 SCTP_RTT_FROM_NON_DATA); 523 retval = sctp_send_cookie_echo(m, offset, initack_limit, stcb, net); 524 return (retval); 525 } 526 527 static void 528 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp, 529 struct sctp_tcb *stcb, struct sctp_nets *net) 530 { 531 union sctp_sockstore store; 532 struct sctp_nets *r_net, *f_net; 533 struct timeval tv; 534 int req_prim = 0; 535 uint16_t old_error_counter; 536 537 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) { 538 /* Invalid length */ 539 return; 540 } 541 542 memset(&store, 0, sizeof(store)); 543 switch (cp->heartbeat.hb_info.addr_family) { 544 #ifdef INET 545 case AF_INET: 546 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) { 547 store.sin.sin_family = cp->heartbeat.hb_info.addr_family; 548 store.sin.sin_len = cp->heartbeat.hb_info.addr_len; 549 store.sin.sin_port = stcb->rport; 550 memcpy(&store.sin.sin_addr, cp->heartbeat.hb_info.address, 551 sizeof(store.sin.sin_addr)); 552 } else { 553 return; 554 } 555 break; 556 #endif 557 #ifdef INET6 558 case AF_INET6: 559 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) { 560 store.sin6.sin6_family = cp->heartbeat.hb_info.addr_family; 561 store.sin6.sin6_len = cp->heartbeat.hb_info.addr_len; 562 store.sin6.sin6_port = stcb->rport; 563 memcpy(&store.sin6.sin6_addr, cp->heartbeat.hb_info.address, sizeof(struct in6_addr)); 564 } else { 565 return; 566 } 567 break; 568 #endif 569 default: 570 return; 571 } 572 r_net = sctp_findnet(stcb, &store.sa); 573 if (r_net == NULL) { 574 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n"); 575 return; 576 } 577 if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) && 578 (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) && 579 (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) { 580 /* 581 * If the its a HB and it's random value is correct when can 582 * confirm the destination. 583 */ 584 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 585 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) { 586 stcb->asoc.primary_destination = r_net; 587 r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY; 588 f_net = TAILQ_FIRST(&stcb->asoc.nets); 589 if (f_net != r_net) { 590 /* 591 * first one on the list is NOT the primary 592 * sctp_cmpaddr() is much more efficient if 593 * the primary is the first on the list, 594 * make it so. 595 */ 596 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next); 597 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next); 598 } 599 req_prim = 1; 600 } 601 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 602 stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 603 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, 604 r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4); 605 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 606 } 607 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 608 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 609 stcb->asoc.overall_error_count, 610 0, 611 SCTP_FROM_SCTP_INPUT, 612 __LINE__); 613 } 614 stcb->asoc.overall_error_count = 0; 615 old_error_counter = r_net->error_count; 616 r_net->error_count = 0; 617 r_net->hb_responded = 1; 618 tv.tv_sec = cp->heartbeat.hb_info.time_value_1; 619 tv.tv_usec = cp->heartbeat.hb_info.time_value_2; 620 /* Now lets do a RTO with this */ 621 sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, 622 SCTP_RTT_FROM_NON_DATA); 623 if (!(r_net->dest_state & SCTP_ADDR_REACHABLE)) { 624 r_net->dest_state |= SCTP_ADDR_REACHABLE; 625 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb, 626 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 627 } 628 if (r_net->dest_state & SCTP_ADDR_PF) { 629 r_net->dest_state &= ~SCTP_ADDR_PF; 630 stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net); 631 } 632 if (old_error_counter > 0) { 633 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 634 stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_5); 635 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 636 } 637 if (r_net == stcb->asoc.primary_destination) { 638 if (stcb->asoc.alternate) { 639 /* release the alternate, primary is good */ 640 sctp_free_remote_addr(stcb->asoc.alternate); 641 stcb->asoc.alternate = NULL; 642 } 643 } 644 /* Mobility adaptation */ 645 if (req_prim) { 646 if ((sctp_is_mobility_feature_on(stcb->sctp_ep, 647 SCTP_MOBILITY_BASE) || 648 sctp_is_mobility_feature_on(stcb->sctp_ep, 649 SCTP_MOBILITY_FASTHANDOFF)) && 650 sctp_is_mobility_feature_on(stcb->sctp_ep, 651 SCTP_MOBILITY_PRIM_DELETED)) { 652 sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED, 653 stcb->sctp_ep, stcb, NULL, 654 SCTP_FROM_SCTP_INPUT + SCTP_LOC_6); 655 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 656 SCTP_MOBILITY_FASTHANDOFF)) { 657 sctp_assoc_immediate_retrans(stcb, 658 stcb->asoc.primary_destination); 659 } 660 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 661 SCTP_MOBILITY_BASE)) { 662 sctp_move_chunks_from_net(stcb, 663 stcb->asoc.deleted_primary); 664 } 665 sctp_delete_prim_timer(stcb->sctp_ep, stcb); 666 } 667 } 668 } 669 670 static int 671 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb) 672 { 673 /* 674 * Return 0 means we want you to proceed with the abort non-zero 675 * means no abort processing. 676 */ 677 uint32_t new_vtag; 678 struct sctpasochead *head; 679 680 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || 681 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 682 atomic_add_int(&stcb->asoc.refcnt, 1); 683 SCTP_TCB_UNLOCK(stcb); 684 SCTP_INP_INFO_WLOCK(); 685 SCTP_TCB_LOCK(stcb); 686 atomic_subtract_int(&stcb->asoc.refcnt, 1); 687 } else { 688 return (0); 689 } 690 new_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 691 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) { 692 /* generate a new vtag and send init */ 693 LIST_REMOVE(stcb, sctp_asocs); 694 stcb->asoc.my_vtag = new_vtag; 695 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 696 /* 697 * put it in the bucket in the vtag hash of assoc's for the 698 * system 699 */ 700 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 701 SCTP_INP_INFO_WUNLOCK(); 702 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 703 return (1); 704 } else { 705 /* 706 * treat like a case where the cookie expired i.e.: - dump 707 * current cookie. - generate a new vtag. - resend init. 708 */ 709 /* generate a new vtag and send init */ 710 LIST_REMOVE(stcb, sctp_asocs); 711 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT); 712 sctp_stop_all_cookie_timers(stcb); 713 sctp_toss_old_cookies(stcb, &stcb->asoc); 714 stcb->asoc.my_vtag = new_vtag; 715 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 716 /* 717 * put it in the bucket in the vtag hash of assoc's for the 718 * system 719 */ 720 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 721 SCTP_INP_INFO_WUNLOCK(); 722 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 723 return (1); 724 } 725 return (0); 726 } 727 728 static int 729 sctp_handle_nat_missing_state(struct sctp_tcb *stcb, 730 struct sctp_nets *net) 731 { 732 /* 733 * return 0 means we want you to proceed with the abort non-zero 734 * means no abort processing 735 */ 736 if (stcb->asoc.auth_supported == 0) { 737 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n"); 738 return (0); 739 } 740 sctp_asconf_send_nat_state_update(stcb, net); 741 return (1); 742 } 743 744 /* Returns 1 if the stcb was aborted, 0 otherwise */ 745 static int 746 sctp_handle_abort(struct sctp_abort_chunk *abort, 747 struct sctp_tcb *stcb, struct sctp_nets *net) 748 { 749 uint16_t len; 750 uint16_t error; 751 752 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n"); 753 if (stcb == NULL) 754 return (0); 755 756 len = ntohs(abort->ch.chunk_length); 757 if (len >= sizeof(struct sctp_chunkhdr) + sizeof(struct sctp_error_cause)) { 758 /* 759 * Need to check the cause codes for our two magic nat 760 * aborts which don't kill the assoc necessarily. 761 */ 762 struct sctp_error_cause *cause; 763 764 cause = (struct sctp_error_cause *)(abort + 1); 765 error = ntohs(cause->code); 766 if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) { 767 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state, ABORT flags:%x\n", 768 abort->ch.chunk_flags); 769 if (sctp_handle_nat_colliding_state(stcb)) { 770 return (0); 771 } 772 } else if (error == SCTP_CAUSE_NAT_MISSING_STATE) { 773 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state, ABORT flags:%x\n", 774 abort->ch.chunk_flags); 775 if (sctp_handle_nat_missing_state(stcb, net)) { 776 return (0); 777 } 778 } 779 } else { 780 error = 0; 781 } 782 /* stop any receive timers */ 783 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, NULL, 784 SCTP_FROM_SCTP_INPUT + SCTP_LOC_7); 785 /* notify user of the abort and clean up... */ 786 sctp_abort_notification(stcb, true, false, error, abort, SCTP_SO_NOT_LOCKED); 787 /* free the tcb */ 788 SCTP_STAT_INCR_COUNTER32(sctps_aborted); 789 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) || 790 (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 791 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 792 } 793 #ifdef SCTP_ASOCLOG_OF_TSNS 794 sctp_print_out_track_log(stcb); 795 #endif 796 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 797 SCTP_FROM_SCTP_INPUT + SCTP_LOC_8); 798 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n"); 799 return (1); 800 } 801 802 static void 803 sctp_start_net_timers(struct sctp_tcb *stcb) 804 { 805 uint32_t cnt_hb_sent; 806 struct sctp_nets *net; 807 808 cnt_hb_sent = 0; 809 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 810 /* 811 * For each network start: 1) A pmtu timer. 2) A HB timer 3) 812 * If the dest in unconfirmed send a hb as well if under 813 * max_hb_burst have been sent. 814 */ 815 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net); 816 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net); 817 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) && 818 (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) { 819 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 820 cnt_hb_sent++; 821 } 822 } 823 if (cnt_hb_sent) { 824 sctp_chunk_output(stcb->sctp_ep, stcb, 825 SCTP_OUTPUT_FROM_COOKIE_ACK, 826 SCTP_SO_NOT_LOCKED); 827 } 828 } 829 830 static void 831 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp, 832 struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag) 833 { 834 struct sctp_association *asoc; 835 int some_on_streamwheel; 836 int old_state; 837 838 SCTPDBG(SCTP_DEBUG_INPUT2, 839 "sctp_handle_shutdown: handling SHUTDOWN\n"); 840 if (stcb == NULL) 841 return; 842 asoc = &stcb->asoc; 843 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || 844 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 845 return; 846 } 847 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) { 848 /* Shutdown NOT the expected size */ 849 return; 850 } 851 old_state = SCTP_GET_STATE(stcb); 852 sctp_update_acked(stcb, cp, abort_flag); 853 if (*abort_flag) { 854 return; 855 } 856 if (asoc->control_pdapi) { 857 /* 858 * With a normal shutdown we assume the end of last record. 859 */ 860 SCTP_INP_READ_LOCK(stcb->sctp_ep); 861 if (asoc->control_pdapi->on_strm_q) { 862 struct sctp_stream_in *strm; 863 864 strm = &asoc->strmin[asoc->control_pdapi->sinfo_stream]; 865 if (asoc->control_pdapi->on_strm_q == SCTP_ON_UNORDERED) { 866 /* Unordered */ 867 TAILQ_REMOVE(&strm->uno_inqueue, asoc->control_pdapi, next_instrm); 868 asoc->control_pdapi->on_strm_q = 0; 869 } else if (asoc->control_pdapi->on_strm_q == SCTP_ON_ORDERED) { 870 /* Ordered */ 871 TAILQ_REMOVE(&strm->inqueue, asoc->control_pdapi, next_instrm); 872 asoc->control_pdapi->on_strm_q = 0; 873 #ifdef INVARIANTS 874 } else { 875 panic("Unknown state on ctrl:%p on_strm_q:%d", 876 asoc->control_pdapi, 877 asoc->control_pdapi->on_strm_q); 878 #endif 879 } 880 } 881 asoc->control_pdapi->end_added = 1; 882 asoc->control_pdapi->pdapi_aborted = 1; 883 asoc->control_pdapi = NULL; 884 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 885 if (stcb->sctp_socket) { 886 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 887 } 888 } 889 /* goto SHUTDOWN_RECEIVED state to block new requests */ 890 if (stcb->sctp_socket) { 891 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) && 892 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) && 893 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT)) { 894 SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_RECEIVED); 895 /* 896 * notify upper layer that peer has initiated a 897 * shutdown 898 */ 899 sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 900 901 /* reset time */ 902 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 903 } 904 } 905 if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) { 906 /* 907 * stop the shutdown timer, since we WILL move to 908 * SHUTDOWN-ACK-SENT. 909 */ 910 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, 911 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9); 912 } 913 /* Now is there unsent data on a stream somewhere? */ 914 some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED); 915 916 if (!TAILQ_EMPTY(&asoc->send_queue) || 917 !TAILQ_EMPTY(&asoc->sent_queue) || 918 some_on_streamwheel) { 919 /* By returning we will push more data out */ 920 return; 921 } else { 922 /* no outstanding data to send, so move on... */ 923 /* send SHUTDOWN-ACK */ 924 /* move to SHUTDOWN-ACK-SENT state */ 925 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) || 926 (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 927 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 928 } 929 if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 930 SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_ACK_SENT); 931 sctp_stop_timers_for_shutdown(stcb); 932 sctp_send_shutdown_ack(stcb, net); 933 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, 934 stcb->sctp_ep, stcb, net); 935 } else if (old_state == SCTP_STATE_SHUTDOWN_ACK_SENT) { 936 sctp_send_shutdown_ack(stcb, net); 937 } 938 } 939 } 940 941 static void 942 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED, 943 struct sctp_tcb *stcb, 944 struct sctp_nets *net) 945 { 946 struct sctp_association *asoc; 947 948 SCTPDBG(SCTP_DEBUG_INPUT2, 949 "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n"); 950 if (stcb == NULL) 951 return; 952 953 asoc = &stcb->asoc; 954 /* process according to association state */ 955 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || 956 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 957 /* unexpected SHUTDOWN-ACK... do OOTB handling... */ 958 sctp_send_shutdown_complete(stcb, net, 1); 959 SCTP_TCB_UNLOCK(stcb); 960 return; 961 } 962 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) && 963 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) { 964 /* unexpected SHUTDOWN-ACK... so ignore... */ 965 SCTP_TCB_UNLOCK(stcb); 966 return; 967 } 968 if (asoc->control_pdapi) { 969 /* 970 * With a normal shutdown we assume the end of last record. 971 */ 972 SCTP_INP_READ_LOCK(stcb->sctp_ep); 973 asoc->control_pdapi->end_added = 1; 974 asoc->control_pdapi->pdapi_aborted = 1; 975 asoc->control_pdapi = NULL; 976 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 977 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 978 } 979 #ifdef INVARIANTS 980 if (!TAILQ_EMPTY(&asoc->send_queue) || 981 !TAILQ_EMPTY(&asoc->sent_queue) || 982 sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) { 983 panic("Queues are not empty when handling SHUTDOWN-ACK"); 984 } 985 #endif 986 /* stop the timer */ 987 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, 988 SCTP_FROM_SCTP_INPUT + SCTP_LOC_10); 989 /* send SHUTDOWN-COMPLETE */ 990 sctp_send_shutdown_complete(stcb, net, 0); 991 /* notify upper layer protocol */ 992 if (stcb->sctp_socket) { 993 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 994 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 995 stcb->sctp_socket->so_snd.sb_cc = 0; 996 } 997 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 998 } 999 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 1000 /* free the TCB but first save off the ep */ 1001 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1002 SCTP_FROM_SCTP_INPUT + SCTP_LOC_11); 1003 } 1004 1005 static void 1006 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, uint8_t chunk_type) 1007 { 1008 switch (chunk_type) { 1009 case SCTP_ASCONF_ACK: 1010 case SCTP_ASCONF: 1011 sctp_asconf_cleanup(stcb); 1012 break; 1013 case SCTP_IFORWARD_CUM_TSN: 1014 case SCTP_FORWARD_CUM_TSN: 1015 stcb->asoc.prsctp_supported = 0; 1016 break; 1017 default: 1018 SCTPDBG(SCTP_DEBUG_INPUT2, 1019 "Peer does not support chunk type %d (0x%x).\n", 1020 chunk_type, chunk_type); 1021 break; 1022 } 1023 } 1024 1025 /* 1026 * Skip past the param header and then we will find the param that caused the 1027 * problem. There are a number of param's in a ASCONF OR the prsctp param 1028 * these will turn of specific features. 1029 * XXX: Is this the right thing to do? 1030 */ 1031 static void 1032 sctp_process_unrecog_param(struct sctp_tcb *stcb, uint16_t parameter_type) 1033 { 1034 switch (parameter_type) { 1035 /* pr-sctp draft */ 1036 case SCTP_PRSCTP_SUPPORTED: 1037 stcb->asoc.prsctp_supported = 0; 1038 break; 1039 case SCTP_SUPPORTED_CHUNK_EXT: 1040 break; 1041 /* draft-ietf-tsvwg-addip-sctp */ 1042 case SCTP_HAS_NAT_SUPPORT: 1043 stcb->asoc.peer_supports_nat = 0; 1044 break; 1045 case SCTP_ADD_IP_ADDRESS: 1046 case SCTP_DEL_IP_ADDRESS: 1047 case SCTP_SET_PRIM_ADDR: 1048 stcb->asoc.asconf_supported = 0; 1049 break; 1050 case SCTP_SUCCESS_REPORT: 1051 case SCTP_ERROR_CAUSE_IND: 1052 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n"); 1053 SCTPDBG(SCTP_DEBUG_INPUT2, 1054 "Turning off ASCONF to this strange peer\n"); 1055 stcb->asoc.asconf_supported = 0; 1056 break; 1057 default: 1058 SCTPDBG(SCTP_DEBUG_INPUT2, 1059 "Peer does not support param type %d (0x%x)??\n", 1060 parameter_type, parameter_type); 1061 break; 1062 } 1063 } 1064 1065 static int 1066 sctp_handle_error(struct sctp_chunkhdr *ch, 1067 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 1068 { 1069 struct sctp_error_cause *cause; 1070 struct sctp_association *asoc; 1071 uint32_t remaining_length, adjust; 1072 uint16_t code, cause_code, cause_length; 1073 1074 /* parse through all of the errors and process */ 1075 asoc = &stcb->asoc; 1076 cause = (struct sctp_error_cause *)((caddr_t)ch + 1077 sizeof(struct sctp_chunkhdr)); 1078 remaining_length = ntohs(ch->chunk_length); 1079 if (remaining_length > limit) { 1080 remaining_length = limit; 1081 } 1082 if (remaining_length >= sizeof(struct sctp_chunkhdr)) { 1083 remaining_length -= sizeof(struct sctp_chunkhdr); 1084 } else { 1085 remaining_length = 0; 1086 } 1087 code = 0; 1088 while (remaining_length >= sizeof(struct sctp_error_cause)) { 1089 /* Process an Error Cause */ 1090 cause_code = ntohs(cause->code); 1091 cause_length = ntohs(cause->length); 1092 if ((cause_length > remaining_length) || (cause_length == 0)) { 1093 /* Invalid cause length, possibly due to truncation. */ 1094 SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in cause - bytes left: %u cause length: %u\n", 1095 remaining_length, cause_length); 1096 return (0); 1097 } 1098 if (code == 0) { 1099 /* report the first error cause */ 1100 code = cause_code; 1101 } 1102 switch (cause_code) { 1103 case SCTP_CAUSE_INVALID_STREAM: 1104 case SCTP_CAUSE_MISSING_PARAM: 1105 case SCTP_CAUSE_INVALID_PARAM: 1106 case SCTP_CAUSE_NO_USER_DATA: 1107 SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %u back? We have a bug :/ (or do they?)\n", 1108 cause_code); 1109 break; 1110 case SCTP_CAUSE_NAT_COLLIDING_STATE: 1111 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state, ERROR flags: %x\n", 1112 ch->chunk_flags); 1113 if (sctp_handle_nat_colliding_state(stcb)) { 1114 return (0); 1115 } 1116 break; 1117 case SCTP_CAUSE_NAT_MISSING_STATE: 1118 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state, ERROR flags: %x\n", 1119 ch->chunk_flags); 1120 if (sctp_handle_nat_missing_state(stcb, net)) { 1121 return (0); 1122 } 1123 break; 1124 case SCTP_CAUSE_STALE_COOKIE: 1125 /* 1126 * We only act if we have echoed a cookie and are 1127 * waiting. 1128 */ 1129 if ((cause_length >= sizeof(struct sctp_error_stale_cookie)) && 1130 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 1131 struct sctp_error_stale_cookie *stale_cookie; 1132 1133 stale_cookie = (struct sctp_error_stale_cookie *)cause; 1134 /* stable_time is in usec, convert to msec. */ 1135 asoc->cookie_preserve_req = ntohl(stale_cookie->stale_time) / 1000; 1136 /* Double it to be more robust on RTX. */ 1137 asoc->cookie_preserve_req *= 2; 1138 asoc->stale_cookie_count++; 1139 if (asoc->stale_cookie_count > 1140 asoc->max_init_times) { 1141 sctp_abort_notification(stcb, false, true, 0, NULL, SCTP_SO_NOT_LOCKED); 1142 /* now free the asoc */ 1143 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1144 SCTP_FROM_SCTP_INPUT + SCTP_LOC_12); 1145 return (-1); 1146 } 1147 /* blast back to INIT state */ 1148 sctp_toss_old_cookies(stcb, &stcb->asoc); 1149 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT); 1150 sctp_stop_all_cookie_timers(stcb); 1151 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 1152 } 1153 break; 1154 case SCTP_CAUSE_UNRESOLVABLE_ADDR: 1155 /* 1156 * Nothing we can do here, we don't do hostname 1157 * addresses so if the peer does not like my IPv6 1158 * (or IPv4 for that matter) it does not matter. If 1159 * they don't support that type of address, they can 1160 * NOT possibly get that packet type... i.e. with no 1161 * IPv6 you can't receive a IPv6 packet. so we can 1162 * safely ignore this one. If we ever added support 1163 * for HOSTNAME Addresses, then we would need to do 1164 * something here. 1165 */ 1166 break; 1167 case SCTP_CAUSE_UNRECOG_CHUNK: 1168 if (cause_length >= sizeof(struct sctp_error_unrecognized_chunk)) { 1169 struct sctp_error_unrecognized_chunk *unrec_chunk; 1170 1171 unrec_chunk = (struct sctp_error_unrecognized_chunk *)cause; 1172 sctp_process_unrecog_chunk(stcb, unrec_chunk->ch.chunk_type); 1173 } 1174 break; 1175 case SCTP_CAUSE_UNRECOG_PARAM: 1176 /* XXX: We only consider the first parameter */ 1177 if (cause_length >= sizeof(struct sctp_error_cause) + sizeof(struct sctp_paramhdr)) { 1178 struct sctp_paramhdr *unrec_parameter; 1179 1180 unrec_parameter = (struct sctp_paramhdr *)(cause + 1); 1181 sctp_process_unrecog_param(stcb, ntohs(unrec_parameter->param_type)); 1182 } 1183 break; 1184 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN: 1185 /* 1186 * We ignore this since the timer will drive out a 1187 * new cookie anyway and there timer will drive us 1188 * to send a SHUTDOWN_COMPLETE. We can't send one 1189 * here since we don't have their tag. 1190 */ 1191 break; 1192 case SCTP_CAUSE_DELETING_LAST_ADDR: 1193 case SCTP_CAUSE_RESOURCE_SHORTAGE: 1194 case SCTP_CAUSE_DELETING_SRC_ADDR: 1195 /* 1196 * We should NOT get these here, but in a 1197 * ASCONF-ACK. 1198 */ 1199 SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a error cause with code %u.\n", 1200 cause_code); 1201 break; 1202 case SCTP_CAUSE_OUT_OF_RESC: 1203 /* 1204 * And what, pray tell do we do with the fact that 1205 * the peer is out of resources? Not really sure we 1206 * could do anything but abort. I suspect this 1207 * should have came WITH an abort instead of in a 1208 * OP-ERROR. 1209 */ 1210 break; 1211 default: 1212 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown code 0x%x\n", 1213 cause_code); 1214 break; 1215 } 1216 adjust = SCTP_SIZE32(cause_length); 1217 if (remaining_length >= adjust) { 1218 remaining_length -= adjust; 1219 } else { 1220 remaining_length = 0; 1221 } 1222 cause = (struct sctp_error_cause *)((caddr_t)cause + adjust); 1223 } 1224 sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, code, ch, SCTP_SO_NOT_LOCKED); 1225 return (0); 1226 } 1227 1228 static int 1229 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset, 1230 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 1231 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 1232 struct sctp_nets *net, int *abort_no_unlock, 1233 uint8_t mflowtype, uint32_t mflowid, 1234 uint32_t vrf_id) 1235 { 1236 struct sctp_init_ack *init_ack; 1237 struct mbuf *op_err; 1238 1239 SCTPDBG(SCTP_DEBUG_INPUT2, 1240 "sctp_handle_init_ack: handling INIT-ACK\n"); 1241 1242 if (stcb == NULL) { 1243 SCTPDBG(SCTP_DEBUG_INPUT2, 1244 "sctp_handle_init_ack: TCB is null\n"); 1245 return (-1); 1246 } 1247 /* Only process the INIT-ACK chunk in COOKIE WAIT state. */ 1248 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) { 1249 init_ack = &cp->init; 1250 /* Validate parameters. */ 1251 if ((ntohl(init_ack->initiate_tag) == 0) || 1252 (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) || 1253 (ntohs(init_ack->num_inbound_streams) == 0) || 1254 (ntohs(init_ack->num_outbound_streams) == 0)) { 1255 /* One of the mandatory parameters is illegal. */ 1256 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1257 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1258 src, dst, sh, op_err, 1259 mflowtype, mflowid, 1260 vrf_id, net->port); 1261 *abort_no_unlock = 1; 1262 return (-1); 1263 } 1264 if (stcb->asoc.primary_destination->dest_state & 1265 SCTP_ADDR_UNCONFIRMED) { 1266 /* 1267 * The primary is where we sent the INIT, we can 1268 * always consider it confirmed when the INIT-ACK is 1269 * returned. Do this before we load addresses 1270 * though. 1271 */ 1272 stcb->asoc.primary_destination->dest_state &= 1273 ~SCTP_ADDR_UNCONFIRMED; 1274 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 1275 stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED); 1276 } 1277 if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb, 1278 net, abort_no_unlock, 1279 mflowtype, mflowid, 1280 vrf_id) < 0) { 1281 /* error in parsing parameters */ 1282 return (-1); 1283 } 1284 /* Update our state. */ 1285 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n"); 1286 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_ECHOED); 1287 1288 /* Reset the RTO calculation. */ 1289 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 1290 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 1291 stcb->asoc.overall_error_count, 1292 0, 1293 SCTP_FROM_SCTP_INPUT, 1294 __LINE__); 1295 } 1296 stcb->asoc.overall_error_count = 0; 1297 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 1298 /* 1299 * Collapse the init timer back in case of a exponential 1300 * backoff. 1301 */ 1302 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep, 1303 stcb, net); 1304 /* 1305 * The output routine at the end of the inbound data 1306 * processing will cause the cookie to be sent. 1307 */ 1308 SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n"); 1309 return (0); 1310 } else { 1311 return (-1); 1312 } 1313 } 1314 1315 static struct sctp_tcb * 1316 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1317 struct sockaddr *src, struct sockaddr *dst, 1318 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1319 struct sctp_inpcb *inp, struct sctp_nets **netp, 1320 struct sockaddr *init_src, int *notification, 1321 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1322 uint8_t mflowtype, uint32_t mflowid, 1323 uint32_t vrf_id, uint16_t port); 1324 1325 /* 1326 * handle a state cookie for an existing association m: input packet mbuf 1327 * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a 1328 * "split" mbuf and the cookie signature does not exist offset: offset into 1329 * mbuf to the cookie-echo chunk 1330 */ 1331 static struct sctp_tcb * 1332 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset, 1333 struct sockaddr *src, struct sockaddr *dst, 1334 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1335 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp, 1336 struct sockaddr *init_src, int *notification, 1337 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1338 uint8_t mflowtype, uint32_t mflowid, 1339 uint32_t vrf_id, uint16_t port) 1340 { 1341 struct sctp_association *asoc; 1342 struct sctp_init_chunk *init_cp, init_buf; 1343 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1344 struct sctp_asconf_addr *aparam, *naparam; 1345 struct sctp_asconf_ack *aack, *naack; 1346 struct sctp_tmit_chunk *chk, *nchk; 1347 struct sctp_stream_reset_list *strrst, *nstrrst; 1348 struct sctp_queued_to_read *sq, *nsq; 1349 struct sctp_nets *net; 1350 struct mbuf *op_err; 1351 struct timeval old; 1352 int init_offset, initack_offset, i; 1353 int retval; 1354 int spec_flag = 0; 1355 uint32_t how_indx; 1356 #if defined(SCTP_DETAILED_STR_STATS) 1357 int j; 1358 #endif 1359 1360 net = *netp; 1361 /* I know that the TCB is non-NULL from the caller */ 1362 asoc = &stcb->asoc; 1363 for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) { 1364 if (asoc->cookie_how[how_indx] == 0) 1365 break; 1366 } 1367 if (how_indx < sizeof(asoc->cookie_how)) { 1368 asoc->cookie_how[how_indx] = 1; 1369 } 1370 if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 1371 /* SHUTDOWN came in after sending INIT-ACK */ 1372 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination); 1373 op_err = sctp_generate_cause(SCTP_CAUSE_COOKIE_IN_SHUTDOWN, ""); 1374 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 1375 mflowtype, mflowid, inp->fibnum, 1376 vrf_id, net->port); 1377 if (how_indx < sizeof(asoc->cookie_how)) 1378 asoc->cookie_how[how_indx] = 2; 1379 SCTP_TCB_UNLOCK(stcb); 1380 return (NULL); 1381 } 1382 /* 1383 * find and validate the INIT chunk in the cookie (peer's info) the 1384 * INIT should start after the cookie-echo header struct (chunk 1385 * header, state cookie header struct) 1386 */ 1387 init_offset = offset += sizeof(struct sctp_cookie_echo_chunk); 1388 1389 init_cp = (struct sctp_init_chunk *) 1390 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 1391 (uint8_t *)&init_buf); 1392 if (init_cp == NULL) { 1393 /* could not pull a INIT chunk in cookie */ 1394 SCTP_TCB_UNLOCK(stcb); 1395 return (NULL); 1396 } 1397 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 1398 SCTP_TCB_UNLOCK(stcb); 1399 return (NULL); 1400 } 1401 /* 1402 * find and validate the INIT-ACK chunk in the cookie (my info) the 1403 * INIT-ACK follows the INIT chunk 1404 */ 1405 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 1406 initack_cp = (struct sctp_init_ack_chunk *) 1407 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 1408 (uint8_t *)&initack_buf); 1409 if (initack_cp == NULL) { 1410 /* could not pull INIT-ACK chunk in cookie */ 1411 SCTP_TCB_UNLOCK(stcb); 1412 return (NULL); 1413 } 1414 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 1415 SCTP_TCB_UNLOCK(stcb); 1416 return (NULL); 1417 } 1418 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1419 (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) { 1420 /* 1421 * case D in Section 5.2.4 Table 2: MMAA process accordingly 1422 * to get into the OPEN state 1423 */ 1424 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1425 /*- 1426 * Opps, this means that we somehow generated two vtag's 1427 * the same. I.e. we did: 1428 * Us Peer 1429 * <---INIT(tag=a)------ 1430 * ----INIT-ACK(tag=t)--> 1431 * ----INIT(tag=t)------> *1 1432 * <---INIT-ACK(tag=a)--- 1433 * <----CE(tag=t)------------- *2 1434 * 1435 * At point *1 we should be generating a different 1436 * tag t'. Which means we would throw away the CE and send 1437 * ours instead. Basically this is case C (throw away side). 1438 */ 1439 if (how_indx < sizeof(asoc->cookie_how)) 1440 asoc->cookie_how[how_indx] = 17; 1441 SCTP_TCB_UNLOCK(stcb); 1442 return (NULL); 1443 } 1444 switch (SCTP_GET_STATE(stcb)) { 1445 case SCTP_STATE_COOKIE_WAIT: 1446 case SCTP_STATE_COOKIE_ECHOED: 1447 /* 1448 * INIT was sent but got a COOKIE_ECHO with the 1449 * correct tags... just accept it...but we must 1450 * process the init so that we can make sure we have 1451 * the right seq no's. 1452 */ 1453 /* First we must process the INIT !! */ 1454 if (sctp_process_init(init_cp, stcb) < 0) { 1455 if (how_indx < sizeof(asoc->cookie_how)) 1456 asoc->cookie_how[how_indx] = 3; 1457 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 1458 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_init() failed\n"); 1459 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1460 src, dst, sh, op_err, 1461 mflowtype, mflowid, 1462 vrf_id, net->port); 1463 return (NULL); 1464 } 1465 /* we have already processed the INIT so no problem */ 1466 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, 1467 stcb, net, 1468 SCTP_FROM_SCTP_INPUT + SCTP_LOC_13); 1469 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, 1470 stcb, net, 1471 SCTP_FROM_SCTP_INPUT + SCTP_LOC_14); 1472 /* update current state */ 1473 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) 1474 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1475 else 1476 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1477 1478 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 1479 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1480 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1481 stcb->sctp_ep, stcb, NULL); 1482 } 1483 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1484 sctp_stop_all_cookie_timers(stcb); 1485 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1486 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1487 (!SCTP_IS_LISTENING(inp))) { 1488 /* 1489 * Here is where collision would go if we 1490 * did a connect() and instead got a 1491 * init/init-ack/cookie done before the 1492 * init-ack came back.. 1493 */ 1494 stcb->sctp_ep->sctp_flags |= 1495 SCTP_PCB_FLAGS_CONNECTED; 1496 soisconnected(stcb->sctp_socket); 1497 } 1498 /* notify upper layer */ 1499 *notification = SCTP_NOTIFY_ASSOC_UP; 1500 /* 1501 * since we did not send a HB make sure we don't 1502 * double things 1503 */ 1504 old.tv_sec = cookie->time_entered.tv_sec; 1505 old.tv_usec = cookie->time_entered.tv_usec; 1506 net->hb_responded = 1; 1507 sctp_calculate_rto(stcb, asoc, net, &old, 1508 SCTP_RTT_FROM_NON_DATA); 1509 1510 if (stcb->asoc.sctp_autoclose_ticks && 1511 (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) { 1512 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 1513 inp, stcb, NULL); 1514 } 1515 break; 1516 default: 1517 /* 1518 * we're in the OPEN state (or beyond), so peer must 1519 * have simply lost the COOKIE-ACK 1520 */ 1521 break; 1522 } /* end switch */ 1523 sctp_stop_all_cookie_timers(stcb); 1524 if ((retval = sctp_load_addresses_from_init(stcb, m, 1525 init_offset + sizeof(struct sctp_init_chunk), 1526 initack_offset, src, dst, init_src, stcb->asoc.port)) < 0) { 1527 if (how_indx < sizeof(asoc->cookie_how)) 1528 asoc->cookie_how[how_indx] = 4; 1529 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 1530 "Problem with address parameters"); 1531 SCTPDBG(SCTP_DEBUG_INPUT1, 1532 "Load addresses from INIT causes an abort %d\n", 1533 retval); 1534 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1535 src, dst, sh, op_err, 1536 mflowtype, mflowid, 1537 vrf_id, net->port); 1538 return (NULL); 1539 } 1540 /* respond with a COOKIE-ACK */ 1541 sctp_toss_old_cookies(stcb, asoc); 1542 sctp_send_cookie_ack(stcb); 1543 if (how_indx < sizeof(asoc->cookie_how)) 1544 asoc->cookie_how[how_indx] = 5; 1545 return (stcb); 1546 } 1547 1548 if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1549 ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag && 1550 cookie->tie_tag_my_vtag == 0 && 1551 cookie->tie_tag_peer_vtag == 0) { 1552 /* 1553 * case C in Section 5.2.4 Table 2: XMOO silently discard 1554 */ 1555 if (how_indx < sizeof(asoc->cookie_how)) 1556 asoc->cookie_how[how_indx] = 6; 1557 SCTP_TCB_UNLOCK(stcb); 1558 return (NULL); 1559 } 1560 /* 1561 * If nat support, and the below and stcb is established, send back 1562 * a ABORT(colliding state) if we are established. 1563 */ 1564 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) && 1565 (asoc->peer_supports_nat) && 1566 ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1567 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1568 (asoc->peer_vtag == 0)))) { 1569 /* 1570 * Special case - Peer's support nat. We may have two init's 1571 * that we gave out the same tag on since one was not 1572 * established.. i.e. we get INIT from host-1 behind the nat 1573 * and we respond tag-a, we get a INIT from host-2 behind 1574 * the nat and we get tag-a again. Then we bring up host-1 1575 * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1). 1576 * Now we have colliding state. We must send an abort here 1577 * with colliding state indication. 1578 */ 1579 op_err = sctp_generate_cause(SCTP_CAUSE_NAT_COLLIDING_STATE, ""); 1580 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err, 1581 mflowtype, mflowid, inp->fibnum, 1582 vrf_id, port); 1583 SCTP_TCB_UNLOCK(stcb); 1584 return (NULL); 1585 } 1586 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1587 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1588 (asoc->peer_vtag == 0))) { 1589 /* 1590 * case B in Section 5.2.4 Table 2: MXAA or MOAA my info 1591 * should be ok, re-accept peer info 1592 */ 1593 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1594 /* 1595 * Extension of case C. If we hit this, then the 1596 * random number generator returned the same vtag 1597 * when we first sent our INIT-ACK and when we later 1598 * sent our INIT. The side with the seq numbers that 1599 * are different will be the one that normally would 1600 * have hit case C. This in effect "extends" our 1601 * vtags in this collision case to be 64 bits. The 1602 * same collision could occur aka you get both vtag 1603 * and seq number the same twice in a row.. but is 1604 * much less likely. If it did happen then we would 1605 * proceed through and bring up the assoc.. we may 1606 * end up with the wrong stream setup however.. 1607 * which would be bad.. but there is no way to 1608 * tell.. until we send on a stream that does not 1609 * exist :-) 1610 */ 1611 if (how_indx < sizeof(asoc->cookie_how)) 1612 asoc->cookie_how[how_indx] = 7; 1613 1614 SCTP_TCB_UNLOCK(stcb); 1615 return (NULL); 1616 } 1617 if (how_indx < sizeof(asoc->cookie_how)) 1618 asoc->cookie_how[how_indx] = 8; 1619 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, 1620 SCTP_FROM_SCTP_INPUT + SCTP_LOC_15); 1621 sctp_stop_all_cookie_timers(stcb); 1622 /* 1623 * since we did not send a HB make sure we don't double 1624 * things 1625 */ 1626 net->hb_responded = 1; 1627 if (stcb->asoc.sctp_autoclose_ticks && 1628 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 1629 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, 1630 NULL); 1631 } 1632 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1633 if (asoc->pre_open_streams < asoc->streamoutcnt) { 1634 asoc->pre_open_streams = asoc->streamoutcnt; 1635 } 1636 1637 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) { 1638 /* 1639 * Ok the peer probably discarded our data (if we 1640 * echoed a cookie+data). So anything on the 1641 * sent_queue should be marked for retransmit, we 1642 * may not get something to kick us so it COULD 1643 * still take a timeout to move these.. but it can't 1644 * hurt to mark them. 1645 */ 1646 1647 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 1648 if (chk->sent < SCTP_DATAGRAM_RESEND) { 1649 chk->sent = SCTP_DATAGRAM_RESEND; 1650 sctp_flight_size_decrease(chk); 1651 sctp_total_flight_decrease(stcb, chk); 1652 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 1653 spec_flag++; 1654 } 1655 } 1656 } 1657 /* process the INIT info (peer's info) */ 1658 if (sctp_process_init(init_cp, stcb) < 0) { 1659 if (how_indx < sizeof(asoc->cookie_how)) 1660 asoc->cookie_how[how_indx] = 9; 1661 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 1662 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_init() failed\n"); 1663 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1664 src, dst, sh, op_err, 1665 mflowtype, mflowid, 1666 vrf_id, net->port); 1667 return (NULL); 1668 } 1669 if ((retval = sctp_load_addresses_from_init(stcb, m, 1670 init_offset + sizeof(struct sctp_init_chunk), 1671 initack_offset, src, dst, init_src, stcb->asoc.port)) < 0) { 1672 if (how_indx < sizeof(asoc->cookie_how)) 1673 asoc->cookie_how[how_indx] = 10; 1674 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 1675 "Problem with address parameters"); 1676 SCTPDBG(SCTP_DEBUG_INPUT1, 1677 "Load addresses from INIT causes an abort %d\n", 1678 retval); 1679 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1680 src, dst, sh, op_err, 1681 mflowtype, mflowid, 1682 vrf_id, net->port); 1683 return (NULL); 1684 } 1685 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || 1686 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 1687 *notification = SCTP_NOTIFY_ASSOC_UP; 1688 1689 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1690 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1691 (!SCTP_IS_LISTENING(inp))) { 1692 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 1693 soisconnected(stcb->sctp_socket); 1694 } 1695 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) 1696 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1697 else 1698 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1699 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1700 } else if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) { 1701 SCTP_STAT_INCR_COUNTER32(sctps_restartestab); 1702 } else { 1703 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1704 } 1705 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 1706 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1707 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1708 stcb->sctp_ep, stcb, NULL); 1709 } 1710 sctp_stop_all_cookie_timers(stcb); 1711 sctp_toss_old_cookies(stcb, asoc); 1712 sctp_send_cookie_ack(stcb); 1713 if (spec_flag) { 1714 /* 1715 * only if we have retrans set do we do this. What 1716 * this call does is get only the COOKIE-ACK out and 1717 * then when we return the normal call to 1718 * sctp_chunk_output will get the retrans out behind 1719 * this. 1720 */ 1721 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED); 1722 } 1723 if (how_indx < sizeof(asoc->cookie_how)) 1724 asoc->cookie_how[how_indx] = 11; 1725 1726 return (stcb); 1727 } 1728 if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1729 ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) && 1730 cookie->tie_tag_my_vtag == asoc->my_vtag_nonce && 1731 cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce && 1732 cookie->tie_tag_peer_vtag != 0) { 1733 struct sctpasochead *head; 1734 1735 if (asoc->peer_supports_nat) { 1736 struct sctp_tcb *local_stcb; 1737 1738 /* 1739 * This is a gross gross hack. Just call the 1740 * cookie_new code since we are allowing a duplicate 1741 * association. I hope this works... 1742 */ 1743 local_stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, 1744 sh, cookie, cookie_len, 1745 inp, netp, init_src, notification, 1746 auth_skipped, auth_offset, auth_len, 1747 mflowtype, mflowid, 1748 vrf_id, port); 1749 if (local_stcb == NULL) { 1750 SCTP_TCB_UNLOCK(stcb); 1751 } 1752 return (local_stcb); 1753 } 1754 /* 1755 * case A in Section 5.2.4 Table 2: XXMM (peer restarted) 1756 */ 1757 /* temp code */ 1758 if (how_indx < sizeof(asoc->cookie_how)) 1759 asoc->cookie_how[how_indx] = 12; 1760 sctp_stop_association_timers(stcb, false); 1761 /* notify upper layer */ 1762 *notification = SCTP_NOTIFY_ASSOC_RESTART; 1763 atomic_add_int(&stcb->asoc.refcnt, 1); 1764 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_OPEN) && 1765 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) && 1766 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT)) { 1767 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1768 } 1769 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) { 1770 SCTP_STAT_INCR_GAUGE32(sctps_restartestab); 1771 } else if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) { 1772 SCTP_STAT_INCR_GAUGE32(sctps_collisionestab); 1773 } 1774 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1775 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 1776 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1777 stcb->sctp_ep, stcb, NULL); 1778 1779 } else if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) { 1780 /* move to OPEN state, if not in SHUTDOWN_SENT */ 1781 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 1782 } 1783 if (asoc->pre_open_streams < asoc->streamoutcnt) { 1784 asoc->pre_open_streams = asoc->streamoutcnt; 1785 } 1786 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 1787 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 1788 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 1789 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 1790 asoc->str_reset_seq_in = asoc->init_seq_number; 1791 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 1792 asoc->send_sack = 1; 1793 asoc->data_pkts_seen = 0; 1794 asoc->last_data_chunk_from = NULL; 1795 asoc->last_control_chunk_from = NULL; 1796 asoc->last_net_cmt_send_started = NULL; 1797 if (asoc->mapping_array) { 1798 memset(asoc->mapping_array, 0, 1799 asoc->mapping_array_size); 1800 } 1801 if (asoc->nr_mapping_array) { 1802 memset(asoc->nr_mapping_array, 0, 1803 asoc->mapping_array_size); 1804 } 1805 SCTP_TCB_UNLOCK(stcb); 1806 SCTP_INP_INFO_WLOCK(); 1807 SCTP_INP_WLOCK(stcb->sctp_ep); 1808 SCTP_TCB_LOCK(stcb); 1809 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1810 /* send up all the data */ 1811 sctp_report_all_outbound(stcb, 0, SCTP_SO_LOCKED); 1812 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 1813 stcb->asoc.strmout[i].chunks_on_queues = 0; 1814 #if defined(SCTP_DETAILED_STR_STATS) 1815 for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) { 1816 asoc->strmout[i].abandoned_sent[j] = 0; 1817 asoc->strmout[i].abandoned_unsent[j] = 0; 1818 } 1819 #else 1820 asoc->strmout[i].abandoned_sent[0] = 0; 1821 asoc->strmout[i].abandoned_unsent[0] = 0; 1822 #endif 1823 stcb->asoc.strmout[i].next_mid_ordered = 0; 1824 stcb->asoc.strmout[i].next_mid_unordered = 0; 1825 stcb->asoc.strmout[i].sid = i; 1826 stcb->asoc.strmout[i].last_msg_incomplete = 0; 1827 } 1828 TAILQ_FOREACH_SAFE(strrst, &asoc->resetHead, next_resp, nstrrst) { 1829 TAILQ_REMOVE(&asoc->resetHead, strrst, next_resp); 1830 SCTP_FREE(strrst, SCTP_M_STRESET); 1831 } 1832 TAILQ_FOREACH_SAFE(sq, &asoc->pending_reply_queue, next, nsq) { 1833 TAILQ_REMOVE(&asoc->pending_reply_queue, sq, next); 1834 if (sq->data) { 1835 sctp_m_freem(sq->data); 1836 sq->data = NULL; 1837 } 1838 sctp_free_remote_addr(sq->whoFrom); 1839 sq->whoFrom = NULL; 1840 sq->stcb = NULL; 1841 sctp_free_a_readq(stcb, sq); 1842 } 1843 TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) { 1844 TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next); 1845 if (chk->data) { 1846 sctp_m_freem(chk->data); 1847 chk->data = NULL; 1848 } 1849 if (chk->holds_key_ref) 1850 sctp_auth_key_release(stcb, chk->auth_keyid, SCTP_SO_LOCKED); 1851 sctp_free_remote_addr(chk->whoTo); 1852 SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_chunk), chk); 1853 SCTP_DECR_CHK_COUNT(); 1854 } 1855 asoc->ctrl_queue_cnt = 0; 1856 asoc->str_reset = NULL; 1857 asoc->stream_reset_outstanding = 0; 1858 TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) { 1859 TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next); 1860 if (chk->data) { 1861 sctp_m_freem(chk->data); 1862 chk->data = NULL; 1863 } 1864 if (chk->holds_key_ref) 1865 sctp_auth_key_release(stcb, chk->auth_keyid, SCTP_SO_LOCKED); 1866 sctp_free_remote_addr(chk->whoTo); 1867 SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_chunk), chk); 1868 SCTP_DECR_CHK_COUNT(); 1869 } 1870 TAILQ_FOREACH_SAFE(aparam, &asoc->asconf_queue, next, naparam) { 1871 TAILQ_REMOVE(&asoc->asconf_queue, aparam, next); 1872 SCTP_FREE(aparam, SCTP_M_ASC_ADDR); 1873 } 1874 TAILQ_FOREACH_SAFE(aack, &asoc->asconf_ack_sent, next, naack) { 1875 TAILQ_REMOVE(&asoc->asconf_ack_sent, aack, next); 1876 if (aack->data != NULL) { 1877 sctp_m_freem(aack->data); 1878 } 1879 SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_asconf_ack), aack); 1880 } 1881 1882 /* process the INIT-ACK info (my info) */ 1883 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 1884 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1885 1886 /* pull from vtag hash */ 1887 LIST_REMOVE(stcb, sctp_asocs); 1888 /* re-insert to new vtag position */ 1889 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, 1890 SCTP_BASE_INFO(hashasocmark))]; 1891 /* 1892 * put it in the bucket in the vtag hash of assoc's for the 1893 * system 1894 */ 1895 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 1896 1897 SCTP_INP_WUNLOCK(stcb->sctp_ep); 1898 SCTP_INP_INFO_WUNLOCK(); 1899 asoc->total_flight = 0; 1900 asoc->total_flight_count = 0; 1901 /* process the INIT info (peer's info) */ 1902 if (sctp_process_init(init_cp, stcb) < 0) { 1903 if (how_indx < sizeof(asoc->cookie_how)) 1904 asoc->cookie_how[how_indx] = 13; 1905 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 1906 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_init() failed\n"); 1907 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1908 src, dst, sh, op_err, 1909 mflowtype, mflowid, 1910 vrf_id, net->port); 1911 return (NULL); 1912 } 1913 /* 1914 * since we did not send a HB make sure we don't double 1915 * things 1916 */ 1917 net->hb_responded = 1; 1918 1919 if ((retval = sctp_load_addresses_from_init(stcb, m, 1920 init_offset + sizeof(struct sctp_init_chunk), 1921 initack_offset, src, dst, init_src, stcb->asoc.port)) < 0) { 1922 if (how_indx < sizeof(asoc->cookie_how)) 1923 asoc->cookie_how[how_indx] = 14; 1924 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 1925 "Problem with address parameters"); 1926 SCTPDBG(SCTP_DEBUG_INPUT1, 1927 "Load addresses from INIT causes an abort %d\n", 1928 retval); 1929 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1930 src, dst, sh, op_err, 1931 mflowtype, mflowid, 1932 vrf_id, net->port); 1933 return (NULL); 1934 } 1935 /* respond with a COOKIE-ACK */ 1936 sctp_send_cookie_ack(stcb); 1937 if (how_indx < sizeof(asoc->cookie_how)) 1938 asoc->cookie_how[how_indx] = 15; 1939 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE) && 1940 (asoc->sctp_autoclose_ticks > 0)) { 1941 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL); 1942 } 1943 return (stcb); 1944 } 1945 if (how_indx < sizeof(asoc->cookie_how)) 1946 asoc->cookie_how[how_indx] = 16; 1947 /* all other cases... */ 1948 SCTP_TCB_UNLOCK(stcb); 1949 return (NULL); 1950 } 1951 1952 /* 1953 * handle a state cookie for a new association m: input packet mbuf chain-- 1954 * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf 1955 * and the cookie signature does not exist offset: offset into mbuf to the 1956 * cookie-echo chunk length: length of the cookie chunk to: where the init 1957 * was from returns a new TCB 1958 */ 1959 static struct sctp_tcb * 1960 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1961 struct sockaddr *src, struct sockaddr *dst, 1962 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1963 struct sctp_inpcb *inp, struct sctp_nets **netp, 1964 struct sockaddr *init_src, int *notification, 1965 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1966 uint8_t mflowtype, uint32_t mflowid, 1967 uint32_t vrf_id, uint16_t port) 1968 { 1969 struct sctp_tcb *stcb; 1970 struct sctp_init_chunk *init_cp, init_buf; 1971 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1972 union sctp_sockstore store; 1973 struct sctp_association *asoc; 1974 int init_offset, initack_offset, initack_limit; 1975 int error = 0; 1976 uint8_t auth_chunk_buf[SCTP_CHUNK_BUFFER_SIZE]; 1977 1978 /* 1979 * find and validate the INIT chunk in the cookie (peer's info) the 1980 * INIT should start after the cookie-echo header struct (chunk 1981 * header, state cookie header struct) 1982 */ 1983 init_offset = offset + sizeof(struct sctp_cookie_echo_chunk); 1984 init_cp = (struct sctp_init_chunk *) 1985 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 1986 (uint8_t *)&init_buf); 1987 if (init_cp == NULL) { 1988 /* could not pull a INIT chunk in cookie */ 1989 SCTPDBG(SCTP_DEBUG_INPUT1, 1990 "process_cookie_new: could not pull INIT chunk hdr\n"); 1991 return (NULL); 1992 } 1993 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 1994 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n"); 1995 return (NULL); 1996 } 1997 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 1998 /* 1999 * find and validate the INIT-ACK chunk in the cookie (my info) the 2000 * INIT-ACK follows the INIT chunk 2001 */ 2002 initack_cp = (struct sctp_init_ack_chunk *) 2003 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 2004 (uint8_t *)&initack_buf); 2005 if (initack_cp == NULL) { 2006 /* could not pull INIT-ACK chunk in cookie */ 2007 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n"); 2008 return (NULL); 2009 } 2010 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 2011 return (NULL); 2012 } 2013 /* 2014 * NOTE: We can't use the INIT_ACK's chk_length to determine the 2015 * "initack_limit" value. This is because the chk_length field 2016 * includes the length of the cookie, but the cookie is omitted when 2017 * the INIT and INIT_ACK are tacked onto the cookie... 2018 */ 2019 initack_limit = offset + cookie_len; 2020 2021 /* 2022 * now that we know the INIT/INIT-ACK are in place, create a new TCB 2023 * and populate 2024 */ 2025 2026 /* 2027 * Here we do a trick, we set in NULL for the proc/thread argument. 2028 * We do this since in effect we only use the p argument when the 2029 * socket is unbound and we must do an implicit bind. Since we are 2030 * getting a cookie, we cannot be unbound. 2031 */ 2032 stcb = sctp_aloc_assoc(inp, init_src, &error, 2033 ntohl(initack_cp->init.initiate_tag), 2034 ntohl(initack_cp->init.initial_tsn), vrf_id, 2035 ntohs(initack_cp->init.num_outbound_streams), 2036 port, 2037 (struct thread *)NULL, 2038 SCTP_DONT_INITIALIZE_AUTH_PARAMS); 2039 if (stcb == NULL) { 2040 struct mbuf *op_err; 2041 2042 /* memory problem? */ 2043 SCTPDBG(SCTP_DEBUG_INPUT1, 2044 "process_cookie_new: no room for another TCB!\n"); 2045 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2046 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2047 src, dst, sh, op_err, 2048 mflowtype, mflowid, 2049 vrf_id, port); 2050 return (NULL); 2051 } 2052 asoc = &stcb->asoc; 2053 /* get scope variables out of cookie */ 2054 asoc->scope.ipv4_local_scope = cookie->ipv4_scope; 2055 asoc->scope.site_scope = cookie->site_scope; 2056 asoc->scope.local_scope = cookie->local_scope; 2057 asoc->scope.loopback_scope = cookie->loopback_scope; 2058 2059 if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) || 2060 (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) { 2061 struct mbuf *op_err; 2062 2063 /* 2064 * Houston we have a problem. The EP changed while the 2065 * cookie was in flight. Only recourse is to abort the 2066 * association. 2067 */ 2068 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2069 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2070 src, dst, sh, op_err, 2071 mflowtype, mflowid, 2072 vrf_id, port); 2073 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2074 SCTP_FROM_SCTP_INPUT + SCTP_LOC_18); 2075 return (NULL); 2076 } 2077 /* process the INIT-ACK info (my info) */ 2078 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 2079 2080 /* process the INIT info (peer's info) */ 2081 if (sctp_process_init(init_cp, stcb) < 0) { 2082 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2083 SCTP_FROM_SCTP_INPUT + SCTP_LOC_19); 2084 return (NULL); 2085 } 2086 /* load all addresses */ 2087 if (sctp_load_addresses_from_init(stcb, m, 2088 init_offset + sizeof(struct sctp_init_chunk), 2089 initack_offset, src, dst, init_src, port) < 0) { 2090 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2091 SCTP_FROM_SCTP_INPUT + SCTP_LOC_20); 2092 return (NULL); 2093 } 2094 /* 2095 * verify any preceding AUTH chunk that was skipped 2096 */ 2097 /* pull the local authentication parameters from the cookie/init-ack */ 2098 sctp_auth_get_cookie_params(stcb, m, 2099 initack_offset + sizeof(struct sctp_init_ack_chunk), 2100 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk))); 2101 if (auth_skipped) { 2102 struct sctp_auth_chunk *auth; 2103 2104 if (auth_len <= SCTP_CHUNK_BUFFER_SIZE) { 2105 auth = (struct sctp_auth_chunk *)sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf); 2106 } else { 2107 auth = NULL; 2108 } 2109 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) { 2110 /* auth HMAC failed, dump the assoc and packet */ 2111 SCTPDBG(SCTP_DEBUG_AUTH1, 2112 "COOKIE-ECHO: AUTH failed\n"); 2113 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2114 SCTP_FROM_SCTP_INPUT + SCTP_LOC_21); 2115 return (NULL); 2116 } else { 2117 /* remaining chunks checked... good to go */ 2118 stcb->asoc.authenticated = 1; 2119 } 2120 } 2121 2122 /* 2123 * if we're doing ASCONFs, check to see if we have any new local 2124 * addresses that need to get added to the peer (eg. addresses 2125 * changed while cookie echo in flight). This needs to be done 2126 * after we go to the OPEN state to do the correct asconf 2127 * processing. else, make sure we have the correct addresses in our 2128 * lists 2129 */ 2130 2131 /* warning, we re-use sin, sin6, sa_store here! */ 2132 /* pull in local_address (our "from" address) */ 2133 switch (cookie->laddr_type) { 2134 #ifdef INET 2135 case SCTP_IPV4_ADDRESS: 2136 /* source addr is IPv4 */ 2137 memset(&store.sin, 0, sizeof(struct sockaddr_in)); 2138 store.sin.sin_family = AF_INET; 2139 store.sin.sin_len = sizeof(struct sockaddr_in); 2140 store.sin.sin_addr.s_addr = cookie->laddress[0]; 2141 break; 2142 #endif 2143 #ifdef INET6 2144 case SCTP_IPV6_ADDRESS: 2145 /* source addr is IPv6 */ 2146 memset(&store.sin6, 0, sizeof(struct sockaddr_in6)); 2147 store.sin6.sin6_family = AF_INET6; 2148 store.sin6.sin6_len = sizeof(struct sockaddr_in6); 2149 store.sin6.sin6_scope_id = cookie->scope_id; 2150 memcpy(&store.sin6.sin6_addr, cookie->laddress, sizeof(struct in6_addr)); 2151 break; 2152 #endif 2153 default: 2154 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2155 SCTP_FROM_SCTP_INPUT + SCTP_LOC_22); 2156 return (NULL); 2157 } 2158 2159 /* update current state */ 2160 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2161 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 2162 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2163 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2164 stcb->sctp_ep, stcb, NULL); 2165 } 2166 sctp_stop_all_cookie_timers(stcb); 2167 SCTP_STAT_INCR_COUNTER32(sctps_passiveestab); 2168 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2169 2170 /* set up to notify upper layer */ 2171 *notification = SCTP_NOTIFY_ASSOC_UP; 2172 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2173 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 2174 (!SCTP_IS_LISTENING(inp))) { 2175 /* 2176 * This is an endpoint that called connect() how it got a 2177 * cookie that is NEW is a bit of a mystery. It must be that 2178 * the INIT was sent, but before it got there.. a complete 2179 * INIT/INIT-ACK/COOKIE arrived. But of course then it 2180 * should have went to the other code.. not here.. oh well.. 2181 * a bit of protection is worth having.. 2182 * 2183 * XXXMJ unlocked 2184 */ 2185 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2186 soisconnected(stcb->sctp_socket); 2187 } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 2188 (SCTP_IS_LISTENING(inp))) { 2189 /* 2190 * We don't want to do anything with this one. Since it is 2191 * the listening guy. The timer will get started for 2192 * accepted connections in the caller. 2193 */ 2194 ; 2195 } 2196 if (stcb->asoc.sctp_autoclose_ticks && 2197 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2198 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL); 2199 } 2200 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 2201 *netp = sctp_findnet(stcb, init_src); 2202 if (*netp != NULL) { 2203 struct timeval old; 2204 2205 /* 2206 * Since we did not send a HB, make sure we don't double 2207 * things. 2208 */ 2209 (*netp)->hb_responded = 1; 2210 /* Calculate the RTT. */ 2211 old.tv_sec = cookie->time_entered.tv_sec; 2212 old.tv_usec = cookie->time_entered.tv_usec; 2213 sctp_calculate_rto(stcb, asoc, *netp, &old, SCTP_RTT_FROM_NON_DATA); 2214 } 2215 /* respond with a COOKIE-ACK */ 2216 sctp_send_cookie_ack(stcb); 2217 2218 /* 2219 * check the address lists for any ASCONFs that need to be sent 2220 * AFTER the cookie-ack is sent 2221 */ 2222 sctp_check_address_list(stcb, m, 2223 initack_offset + sizeof(struct sctp_init_ack_chunk), 2224 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)), 2225 &store.sa, cookie->local_scope, cookie->site_scope, 2226 cookie->ipv4_scope, cookie->loopback_scope); 2227 2228 return (stcb); 2229 } 2230 2231 /* 2232 * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e 2233 * we NEED to make sure we are not already using the vtag. If so we 2234 * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit! 2235 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag, 2236 SCTP_BASE_INFO(hashasocmark))]; 2237 LIST_FOREACH(stcb, head, sctp_asocs) { 2238 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep)) { 2239 -- SEND ABORT - TRY AGAIN -- 2240 } 2241 } 2242 */ 2243 2244 /* 2245 * handles a COOKIE-ECHO message stcb: modified to either a new or left as 2246 * existing (non-NULL) TCB 2247 */ 2248 static struct mbuf * 2249 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset, 2250 struct sockaddr *src, struct sockaddr *dst, 2251 struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp, 2252 struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp, 2253 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2254 struct sctp_tcb **locked_tcb, 2255 uint8_t mflowtype, uint32_t mflowid, 2256 uint32_t vrf_id, uint16_t port) 2257 { 2258 struct sctp_state_cookie *cookie; 2259 struct sctp_tcb *l_stcb = *stcb; 2260 struct sctp_inpcb *l_inp; 2261 struct sockaddr *to; 2262 struct sctp_pcb *ep; 2263 struct mbuf *m_sig; 2264 uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE]; 2265 uint8_t *sig; 2266 uint8_t cookie_ok = 0; 2267 unsigned int sig_offset, cookie_offset; 2268 unsigned int cookie_len; 2269 struct timeval now; 2270 struct timeval time_entered, time_expires; 2271 int notification = 0; 2272 struct sctp_nets *netl; 2273 int had_a_existing_tcb = 0; 2274 int send_int_conf = 0; 2275 #ifdef INET 2276 struct sockaddr_in sin; 2277 #endif 2278 #ifdef INET6 2279 struct sockaddr_in6 sin6; 2280 #endif 2281 2282 SCTPDBG(SCTP_DEBUG_INPUT2, 2283 "sctp_handle_cookie: handling COOKIE-ECHO\n"); 2284 2285 if (inp_p == NULL) { 2286 return (NULL); 2287 } 2288 cookie = &cp->cookie; 2289 cookie_offset = offset + sizeof(struct sctp_chunkhdr); 2290 cookie_len = ntohs(cp->ch.chunk_length); 2291 2292 if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) + 2293 sizeof(struct sctp_init_chunk) + 2294 sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) { 2295 /* cookie too small */ 2296 return (NULL); 2297 } 2298 if ((cookie->peerport != sh->src_port) || 2299 (cookie->myport != sh->dest_port) || 2300 (cookie->my_vtag != sh->v_tag)) { 2301 /* 2302 * invalid ports or bad tag. Note that we always leave the 2303 * v_tag in the header in network order and when we stored 2304 * it in the my_vtag slot we also left it in network order. 2305 * This maintains the match even though it may be in the 2306 * opposite byte order of the machine :-> 2307 */ 2308 return (NULL); 2309 } 2310 /* 2311 * split off the signature into its own mbuf (since it should not be 2312 * calculated in the sctp_hmac_m() call). 2313 */ 2314 sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE; 2315 m_sig = m_split(m, sig_offset, M_NOWAIT); 2316 if (m_sig == NULL) { 2317 /* out of memory or ?? */ 2318 return (NULL); 2319 } 2320 #ifdef SCTP_MBUF_LOGGING 2321 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 2322 sctp_log_mbc(m_sig, SCTP_MBUF_SPLIT); 2323 } 2324 #endif 2325 2326 /* 2327 * compute the signature/digest for the cookie 2328 */ 2329 if (l_stcb != NULL) { 2330 atomic_add_int(&l_stcb->asoc.refcnt, 1); 2331 SCTP_TCB_UNLOCK(l_stcb); 2332 } 2333 l_inp = *inp_p; 2334 SCTP_INP_RLOCK(l_inp); 2335 if (l_stcb != NULL) { 2336 SCTP_TCB_LOCK(l_stcb); 2337 atomic_subtract_int(&l_stcb->asoc.refcnt, 1); 2338 } 2339 if (l_inp->sctp_flags & (SCTP_PCB_FLAGS_SOCKET_GONE | SCTP_PCB_FLAGS_SOCKET_ALLGONE)) { 2340 SCTP_INP_RUNLOCK(l_inp); 2341 sctp_m_freem(m_sig); 2342 return (NULL); 2343 } 2344 ep = &(*inp_p)->sctp_ep; 2345 /* which cookie is it? */ 2346 if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) && 2347 (ep->current_secret_number != ep->last_secret_number)) { 2348 /* it's the old cookie */ 2349 (void)sctp_hmac_m(SCTP_HMAC, 2350 (uint8_t *)ep->secret_key[(int)ep->last_secret_number], 2351 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2352 } else { 2353 /* it's the current cookie */ 2354 (void)sctp_hmac_m(SCTP_HMAC, 2355 (uint8_t *)ep->secret_key[(int)ep->current_secret_number], 2356 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2357 } 2358 /* get the signature */ 2359 SCTP_INP_RUNLOCK(l_inp); 2360 sig = (uint8_t *)sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *)&tmp_sig); 2361 if (sig == NULL) { 2362 /* couldn't find signature */ 2363 sctp_m_freem(m_sig); 2364 return (NULL); 2365 } 2366 /* compare the received digest with the computed digest */ 2367 if (timingsafe_bcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) { 2368 /* try the old cookie? */ 2369 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) && 2370 (ep->current_secret_number != ep->last_secret_number)) { 2371 /* compute digest with old */ 2372 (void)sctp_hmac_m(SCTP_HMAC, 2373 (uint8_t *)ep->secret_key[(int)ep->last_secret_number], 2374 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2375 /* compare */ 2376 if (timingsafe_bcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0) 2377 cookie_ok = 1; 2378 } 2379 } else { 2380 cookie_ok = 1; 2381 } 2382 2383 /* 2384 * Now before we continue we must reconstruct our mbuf so that 2385 * normal processing of any other chunks will work. 2386 */ 2387 { 2388 struct mbuf *m_at; 2389 2390 m_at = m; 2391 while (SCTP_BUF_NEXT(m_at) != NULL) { 2392 m_at = SCTP_BUF_NEXT(m_at); 2393 } 2394 SCTP_BUF_NEXT(m_at) = m_sig; 2395 } 2396 2397 if (cookie_ok == 0) { 2398 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n"); 2399 SCTPDBG(SCTP_DEBUG_INPUT2, 2400 "offset = %u, cookie_offset = %u, sig_offset = %u\n", 2401 (uint32_t)offset, cookie_offset, sig_offset); 2402 return (NULL); 2403 } 2404 2405 if (sctp_ticks_to_msecs(cookie->cookie_life) > SCTP_MAX_COOKIE_LIFE) { 2406 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: Invalid cookie lifetime\n"); 2407 return (NULL); 2408 } 2409 time_entered.tv_sec = cookie->time_entered.tv_sec; 2410 time_entered.tv_usec = cookie->time_entered.tv_usec; 2411 if ((time_entered.tv_sec < 0) || 2412 (time_entered.tv_usec < 0) || 2413 (time_entered.tv_usec >= 1000000)) { 2414 /* Invalid time stamp. Cookie must have been modified. */ 2415 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: Invalid time stamp\n"); 2416 return (NULL); 2417 } 2418 (void)SCTP_GETTIME_TIMEVAL(&now); 2419 if (timevalcmp(&now, &time_entered, <)) { 2420 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie generated in the future!\n"); 2421 return (NULL); 2422 } 2423 /* 2424 * Check the cookie timestamps to be sure it's not stale. 2425 * cookie_life is in ticks, so we convert to seconds. 2426 */ 2427 time_expires.tv_sec = time_entered.tv_sec + sctp_ticks_to_secs(cookie->cookie_life); 2428 time_expires.tv_usec = time_entered.tv_usec; 2429 if (timevalcmp(&now, &time_expires, >)) { 2430 /* cookie is stale! */ 2431 struct mbuf *op_err; 2432 struct sctp_error_stale_cookie *cause; 2433 struct timeval diff; 2434 uint32_t staleness; 2435 2436 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_error_stale_cookie), 2437 0, M_NOWAIT, 1, MT_DATA); 2438 if (op_err == NULL) { 2439 /* FOOBAR */ 2440 return (NULL); 2441 } 2442 /* Set the len */ 2443 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_error_stale_cookie); 2444 cause = mtod(op_err, struct sctp_error_stale_cookie *); 2445 cause->cause.code = htons(SCTP_CAUSE_STALE_COOKIE); 2446 cause->cause.length = htons(sizeof(struct sctp_error_stale_cookie)); 2447 diff = now; 2448 timevalsub(&diff, &time_expires); 2449 if ((uint32_t)diff.tv_sec > UINT32_MAX / 1000000) { 2450 staleness = UINT32_MAX; 2451 } else { 2452 staleness = (uint32_t)diff.tv_sec * 1000000; 2453 } 2454 if (UINT32_MAX - staleness >= (uint32_t)diff.tv_usec) { 2455 staleness += (uint32_t)diff.tv_usec; 2456 } else { 2457 staleness = UINT32_MAX; 2458 } 2459 cause->stale_time = htonl(staleness); 2460 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 2461 mflowtype, mflowid, l_inp->fibnum, 2462 vrf_id, port); 2463 return (NULL); 2464 } 2465 /* 2466 * Now we must see with the lookup address if we have an existing 2467 * asoc. This will only happen if we were in the COOKIE-WAIT state 2468 * and a INIT collided with us and somewhere the peer sent the 2469 * cookie on another address besides the single address our assoc 2470 * had for him. In this case we will have one of the tie-tags set at 2471 * least AND the address field in the cookie can be used to look it 2472 * up. 2473 */ 2474 to = NULL; 2475 switch (cookie->addr_type) { 2476 #ifdef INET6 2477 case SCTP_IPV6_ADDRESS: 2478 memset(&sin6, 0, sizeof(sin6)); 2479 sin6.sin6_family = AF_INET6; 2480 sin6.sin6_len = sizeof(sin6); 2481 sin6.sin6_port = sh->src_port; 2482 sin6.sin6_scope_id = cookie->scope_id; 2483 memcpy(&sin6.sin6_addr.s6_addr, cookie->address, 2484 sizeof(sin6.sin6_addr.s6_addr)); 2485 to = (struct sockaddr *)&sin6; 2486 break; 2487 #endif 2488 #ifdef INET 2489 case SCTP_IPV4_ADDRESS: 2490 memset(&sin, 0, sizeof(sin)); 2491 sin.sin_family = AF_INET; 2492 sin.sin_len = sizeof(sin); 2493 sin.sin_port = sh->src_port; 2494 sin.sin_addr.s_addr = cookie->address[0]; 2495 to = (struct sockaddr *)&sin; 2496 break; 2497 #endif 2498 default: 2499 /* This should not happen */ 2500 return (NULL); 2501 } 2502 if (*stcb == NULL) { 2503 /* Yep, lets check */ 2504 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL); 2505 if (*stcb == NULL) { 2506 /* 2507 * We should have only got back the same inp. If we 2508 * got back a different ep we have a problem. The 2509 * original findep got back l_inp and now 2510 */ 2511 if (l_inp != *inp_p) { 2512 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n"); 2513 } 2514 } else { 2515 if (*locked_tcb == NULL) { 2516 /* 2517 * In this case we found the assoc only 2518 * after we locked the create lock. This 2519 * means we are in a colliding case and we 2520 * must make sure that we unlock the tcb if 2521 * its one of the cases where we throw away 2522 * the incoming packets. 2523 */ 2524 *locked_tcb = *stcb; 2525 2526 /* 2527 * We must also increment the inp ref count 2528 * since the ref_count flags was set when we 2529 * did not find the TCB, now we found it 2530 * which reduces the refcount.. we must 2531 * raise it back out to balance it all :-) 2532 */ 2533 SCTP_INP_INCR_REF((*stcb)->sctp_ep); 2534 if ((*stcb)->sctp_ep != l_inp) { 2535 SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n", 2536 (void *)(*stcb)->sctp_ep, (void *)l_inp); 2537 } 2538 } 2539 } 2540 } 2541 2542 cookie_len -= SCTP_SIGNATURE_SIZE; 2543 if (*stcb == NULL) { 2544 /* this is the "normal" case... get a new TCB */ 2545 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh, 2546 cookie, cookie_len, *inp_p, 2547 netp, to, ¬ification, 2548 auth_skipped, auth_offset, auth_len, 2549 mflowtype, mflowid, 2550 vrf_id, port); 2551 } else { 2552 /* this is abnormal... cookie-echo on existing TCB */ 2553 had_a_existing_tcb = 1; 2554 *stcb = sctp_process_cookie_existing(m, iphlen, offset, 2555 src, dst, sh, 2556 cookie, cookie_len, *inp_p, *stcb, netp, to, 2557 ¬ification, auth_skipped, auth_offset, auth_len, 2558 mflowtype, mflowid, 2559 vrf_id, port); 2560 if (*stcb == NULL) { 2561 *locked_tcb = NULL; 2562 } 2563 } 2564 2565 if (*stcb == NULL) { 2566 /* still no TCB... must be bad cookie-echo */ 2567 return (NULL); 2568 } 2569 if (*netp != NULL) { 2570 (*netp)->flowtype = mflowtype; 2571 (*netp)->flowid = mflowid; 2572 } 2573 /* 2574 * Ok, we built an association so confirm the address we sent the 2575 * INIT-ACK to. 2576 */ 2577 netl = sctp_findnet(*stcb, to); 2578 /* 2579 * This code should in theory NOT run but 2580 */ 2581 if (netl == NULL) { 2582 /* TSNH! Huh, why do I need to add this address here? */ 2583 if (sctp_add_remote_addr(*stcb, to, NULL, port, 2584 SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) { 2585 return (NULL); 2586 } 2587 netl = sctp_findnet(*stcb, to); 2588 } 2589 if (netl) { 2590 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) { 2591 netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 2592 (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL, 2593 netl); 2594 send_int_conf = 1; 2595 } 2596 } 2597 sctp_start_net_timers(*stcb); 2598 if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) { 2599 if (!had_a_existing_tcb || 2600 (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) { 2601 /* 2602 * If we have a NEW cookie or the connect never 2603 * reached the connected state during collision we 2604 * must do the TCP accept thing. 2605 */ 2606 struct socket *so, *oso; 2607 struct sctp_inpcb *inp; 2608 2609 if (notification == SCTP_NOTIFY_ASSOC_RESTART) { 2610 /* 2611 * For a restart we will keep the same 2612 * socket, no need to do anything. I THINK!! 2613 */ 2614 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2615 if (send_int_conf) { 2616 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2617 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2618 } 2619 return (m); 2620 } 2621 oso = (*inp_p)->sctp_socket; 2622 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2623 SCTP_TCB_UNLOCK((*stcb)); 2624 CURVNET_SET(oso->so_vnet); 2625 so = sonewconn(oso, 0 2626 ); 2627 CURVNET_RESTORE(); 2628 SCTP_TCB_LOCK((*stcb)); 2629 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2630 2631 if (so == NULL) { 2632 struct mbuf *op_err; 2633 2634 /* Too many sockets */ 2635 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n"); 2636 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2637 sctp_abort_association(*inp_p, NULL, m, iphlen, 2638 src, dst, sh, op_err, 2639 mflowtype, mflowid, 2640 vrf_id, port); 2641 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, 2642 SCTP_FROM_SCTP_INPUT + SCTP_LOC_23); 2643 return (NULL); 2644 } 2645 inp = (struct sctp_inpcb *)so->so_pcb; 2646 SCTP_INP_INCR_REF(inp); 2647 /* 2648 * We add the unbound flag here so that if we get an 2649 * soabort() before we get the move_pcb done, we 2650 * will properly cleanup. 2651 */ 2652 inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE | 2653 SCTP_PCB_FLAGS_CONNECTED | 2654 SCTP_PCB_FLAGS_IN_TCPPOOL | 2655 SCTP_PCB_FLAGS_UNBOUND | 2656 (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) | 2657 SCTP_PCB_FLAGS_DONT_WAKE); 2658 inp->sctp_features = (*inp_p)->sctp_features; 2659 inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features; 2660 inp->sctp_socket = so; 2661 inp->sctp_frag_point = (*inp_p)->sctp_frag_point; 2662 inp->max_cwnd = (*inp_p)->max_cwnd; 2663 inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off; 2664 inp->ecn_supported = (*inp_p)->ecn_supported; 2665 inp->prsctp_supported = (*inp_p)->prsctp_supported; 2666 inp->auth_supported = (*inp_p)->auth_supported; 2667 inp->asconf_supported = (*inp_p)->asconf_supported; 2668 inp->reconfig_supported = (*inp_p)->reconfig_supported; 2669 inp->nrsack_supported = (*inp_p)->nrsack_supported; 2670 inp->pktdrop_supported = (*inp_p)->pktdrop_supported; 2671 inp->partial_delivery_point = (*inp_p)->partial_delivery_point; 2672 inp->sctp_context = (*inp_p)->sctp_context; 2673 inp->local_strreset_support = (*inp_p)->local_strreset_support; 2674 inp->fibnum = (*inp_p)->fibnum; 2675 /* 2676 * copy in the authentication parameters from the 2677 * original endpoint 2678 */ 2679 if (inp->sctp_ep.local_hmacs) 2680 sctp_free_hmaclist(inp->sctp_ep.local_hmacs); 2681 inp->sctp_ep.local_hmacs = 2682 sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs); 2683 if (inp->sctp_ep.local_auth_chunks) 2684 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks); 2685 inp->sctp_ep.local_auth_chunks = 2686 sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks); 2687 2688 /* 2689 * Now we must move it from one hash table to 2690 * another and get the tcb in the right place. 2691 */ 2692 2693 /* 2694 * This is where the one-2-one socket is put into 2695 * the accept state waiting for the accept! 2696 */ 2697 if (*stcb) { 2698 SCTP_ADD_SUBSTATE(*stcb, SCTP_STATE_IN_ACCEPT_QUEUE); 2699 } 2700 sctp_move_pcb_and_assoc(*inp_p, inp, *stcb); 2701 2702 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2703 SCTP_TCB_UNLOCK((*stcb)); 2704 2705 sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb, 2706 0); 2707 SCTP_TCB_LOCK((*stcb)); 2708 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2709 2710 /* 2711 * now we must check to see if we were aborted while 2712 * the move was going on and the lock/unlock 2713 * happened. 2714 */ 2715 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 2716 /* 2717 * yep it was, we leave the assoc attached 2718 * to the socket since the sctp_inpcb_free() 2719 * call will send an abort for us. 2720 */ 2721 SCTP_INP_DECR_REF(inp); 2722 return (NULL); 2723 } 2724 SCTP_INP_DECR_REF(inp); 2725 /* Switch over to the new guy */ 2726 *inp_p = inp; 2727 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2728 if (send_int_conf) { 2729 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2730 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2731 } 2732 2733 /* 2734 * Pull it from the incomplete queue and wake the 2735 * guy 2736 */ 2737 soisconnected(so); 2738 return (m); 2739 } 2740 } 2741 if (notification) { 2742 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2743 } 2744 if (send_int_conf) { 2745 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2746 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2747 } 2748 return (m); 2749 } 2750 2751 static void 2752 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED, 2753 struct sctp_tcb *stcb, struct sctp_nets *net) 2754 { 2755 /* cp must not be used, others call this without a c-ack :-) */ 2756 struct sctp_association *asoc; 2757 struct sctp_tmit_chunk *chk; 2758 2759 SCTPDBG(SCTP_DEBUG_INPUT2, 2760 "sctp_handle_cookie_ack: handling COOKIE-ACK\n"); 2761 if ((stcb == NULL) || (net == NULL)) { 2762 return; 2763 } 2764 2765 asoc = &stcb->asoc; 2766 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 2767 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 2768 asoc->overall_error_count, 2769 0, 2770 SCTP_FROM_SCTP_INPUT, 2771 __LINE__); 2772 } 2773 asoc->overall_error_count = 0; 2774 sctp_stop_all_cookie_timers(stcb); 2775 /* process according to association state */ 2776 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) { 2777 /* state change only needed when I am in right state */ 2778 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2779 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 2780 sctp_start_net_timers(stcb); 2781 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2782 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2783 stcb->sctp_ep, stcb, NULL); 2784 } 2785 /* update RTO */ 2786 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 2787 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2788 if (asoc->overall_error_count == 0) { 2789 sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, 2790 SCTP_RTT_FROM_NON_DATA); 2791 } 2792 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 2793 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2794 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2795 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 2796 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2797 if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) { 2798 soisconnected(stcb->sctp_socket); 2799 } 2800 } 2801 /* 2802 * since we did not send a HB make sure we don't double 2803 * things 2804 */ 2805 net->hb_responded = 1; 2806 2807 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2808 /* 2809 * We don't need to do the asconf thing, nor hb or 2810 * autoclose if the socket is closed. 2811 */ 2812 goto closed_socket; 2813 } 2814 2815 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 2816 stcb, net); 2817 2818 if (stcb->asoc.sctp_autoclose_ticks && 2819 sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2820 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 2821 stcb->sctp_ep, stcb, NULL); 2822 } 2823 /* 2824 * send ASCONF if parameters are pending and ASCONFs are 2825 * allowed (eg. addresses changed when init/cookie echo were 2826 * in flight) 2827 */ 2828 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) && 2829 (stcb->asoc.asconf_supported == 1) && 2830 (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) { 2831 #ifdef SCTP_TIMER_BASED_ASCONF 2832 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, 2833 stcb->sctp_ep, stcb, 2834 stcb->asoc.primary_destination); 2835 #else 2836 sctp_send_asconf(stcb, stcb->asoc.primary_destination, 2837 SCTP_ADDR_NOT_LOCKED); 2838 #endif 2839 } 2840 } 2841 closed_socket: 2842 /* Toss the cookie if I can */ 2843 sctp_toss_old_cookies(stcb, asoc); 2844 /* Restart the timer if we have pending data */ 2845 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) { 2846 if (chk->whoTo != NULL) { 2847 break; 2848 } 2849 } 2850 if (chk != NULL) { 2851 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 2852 } 2853 } 2854 2855 static void 2856 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp, 2857 struct sctp_tcb *stcb) 2858 { 2859 struct sctp_nets *net; 2860 struct sctp_tmit_chunk *lchk; 2861 struct sctp_ecne_chunk bkup; 2862 uint8_t override_bit; 2863 uint32_t tsn, window_data_tsn; 2864 int len; 2865 unsigned int pkt_cnt; 2866 2867 len = ntohs(cp->ch.chunk_length); 2868 if (len == sizeof(struct old_sctp_ecne_chunk)) { 2869 /* Its the old format */ 2870 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk)); 2871 bkup.num_pkts_since_cwr = htonl(1); 2872 cp = &bkup; 2873 } 2874 SCTP_STAT_INCR(sctps_recvecne); 2875 tsn = ntohl(cp->tsn); 2876 pkt_cnt = ntohl(cp->num_pkts_since_cwr); 2877 lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead); 2878 if (lchk == NULL) { 2879 window_data_tsn = stcb->asoc.sending_seq - 1; 2880 } else { 2881 window_data_tsn = lchk->rec.data.tsn; 2882 } 2883 2884 /* Find where it was sent to if possible. */ 2885 net = NULL; 2886 TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) { 2887 if (lchk->rec.data.tsn == tsn) { 2888 net = lchk->whoTo; 2889 net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send; 2890 break; 2891 } 2892 if (SCTP_TSN_GT(lchk->rec.data.tsn, tsn)) { 2893 break; 2894 } 2895 } 2896 if (net == NULL) { 2897 /* 2898 * What to do. A previous send of a CWR was possibly lost. 2899 * See how old it is, we may have it marked on the actual 2900 * net. 2901 */ 2902 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 2903 if (tsn == net->last_cwr_tsn) { 2904 /* Found him, send it off */ 2905 break; 2906 } 2907 } 2908 if (net == NULL) { 2909 /* 2910 * If we reach here, we need to send a special CWR 2911 * that says hey, we did this a long time ago and 2912 * you lost the response. 2913 */ 2914 net = TAILQ_FIRST(&stcb->asoc.nets); 2915 if (net == NULL) { 2916 /* TSNH */ 2917 return; 2918 } 2919 override_bit = SCTP_CWR_REDUCE_OVERRIDE; 2920 } else { 2921 override_bit = 0; 2922 } 2923 } else { 2924 override_bit = 0; 2925 } 2926 if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) && 2927 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 2928 /* 2929 * JRS - Use the congestion control given in the pluggable 2930 * CC module 2931 */ 2932 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt); 2933 /* 2934 * We reduce once every RTT. So we will only lower cwnd at 2935 * the next sending seq i.e. the window_data_tsn 2936 */ 2937 net->cwr_window_tsn = window_data_tsn; 2938 net->ecn_ce_pkt_cnt += pkt_cnt; 2939 net->lost_cnt = pkt_cnt; 2940 net->last_cwr_tsn = tsn; 2941 } else { 2942 override_bit |= SCTP_CWR_IN_SAME_WINDOW; 2943 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) && 2944 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 2945 /* 2946 * Another loss in the same window update how many 2947 * marks/packets lost we have had. 2948 */ 2949 int cnt = 1; 2950 2951 if (pkt_cnt > net->lost_cnt) { 2952 /* Should be the case */ 2953 cnt = (pkt_cnt - net->lost_cnt); 2954 net->ecn_ce_pkt_cnt += cnt; 2955 } 2956 net->lost_cnt = pkt_cnt; 2957 net->last_cwr_tsn = tsn; 2958 /* 2959 * Most CC functions will ignore this call, since we 2960 * are in-window yet of the initial CE the peer saw. 2961 */ 2962 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt); 2963 } 2964 } 2965 /* 2966 * We always send a CWR this way if our previous one was lost our 2967 * peer will get an update, or if it is not time again to reduce we 2968 * still get the cwr to the peer. Note we set the override when we 2969 * could not find the TSN on the chunk or the destination network. 2970 */ 2971 sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit); 2972 } 2973 2974 static void 2975 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net) 2976 { 2977 /* 2978 * Here we get a CWR from the peer. We must look in the outqueue and 2979 * make sure that we have a covered ECNE in the control chunk part. 2980 * If so remove it. 2981 */ 2982 struct sctp_tmit_chunk *chk, *nchk; 2983 struct sctp_ecne_chunk *ecne; 2984 int override; 2985 uint32_t cwr_tsn; 2986 2987 cwr_tsn = ntohl(cp->tsn); 2988 override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE; 2989 TAILQ_FOREACH_SAFE(chk, &stcb->asoc.control_send_queue, sctp_next, nchk) { 2990 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) { 2991 continue; 2992 } 2993 if ((override == 0) && (chk->whoTo != net)) { 2994 /* Must be from the right src unless override is set */ 2995 continue; 2996 } 2997 ecne = mtod(chk->data, struct sctp_ecne_chunk *); 2998 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) { 2999 /* this covers this ECNE, we can remove it */ 3000 stcb->asoc.ecn_echo_cnt_onq--; 3001 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, 3002 sctp_next); 3003 stcb->asoc.ctrl_queue_cnt--; 3004 sctp_m_freem(chk->data); 3005 chk->data = NULL; 3006 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3007 if (override == 0) { 3008 break; 3009 } 3010 } 3011 } 3012 } 3013 3014 static void 3015 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED, 3016 struct sctp_tcb *stcb, struct sctp_nets *net) 3017 { 3018 3019 SCTPDBG(SCTP_DEBUG_INPUT2, 3020 "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n"); 3021 if (stcb == NULL) 3022 return; 3023 3024 /* process according to association state */ 3025 if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 3026 /* unexpected SHUTDOWN-COMPLETE... so ignore... */ 3027 SCTPDBG(SCTP_DEBUG_INPUT2, 3028 "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n"); 3029 SCTP_TCB_UNLOCK(stcb); 3030 return; 3031 } 3032 /* notify upper layer protocol */ 3033 if (stcb->sctp_socket) { 3034 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 3035 } 3036 #ifdef INVARIANTS 3037 if (!TAILQ_EMPTY(&stcb->asoc.send_queue) || 3038 !TAILQ_EMPTY(&stcb->asoc.sent_queue) || 3039 sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) { 3040 panic("Queues are not empty when handling SHUTDOWN-COMPLETE"); 3041 } 3042 #endif 3043 /* stop the timer */ 3044 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, 3045 SCTP_FROM_SCTP_INPUT + SCTP_LOC_24); 3046 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 3047 /* free the TCB */ 3048 SCTPDBG(SCTP_DEBUG_INPUT2, 3049 "sctp_handle_shutdown_complete: calls free-asoc\n"); 3050 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 3051 SCTP_FROM_SCTP_INPUT + SCTP_LOC_25); 3052 return; 3053 } 3054 3055 static int 3056 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc, 3057 struct sctp_nets *net, uint8_t flg) 3058 { 3059 switch (desc->chunk_type) { 3060 case SCTP_DATA: 3061 case SCTP_IDATA: 3062 /* find the tsn to resend (possibly) */ 3063 { 3064 uint32_t tsn; 3065 struct sctp_tmit_chunk *tp1; 3066 3067 tsn = ntohl(desc->tsn_ifany); 3068 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3069 if (tp1->rec.data.tsn == tsn) { 3070 /* found it */ 3071 break; 3072 } 3073 if (SCTP_TSN_GT(tp1->rec.data.tsn, tsn)) { 3074 /* not found */ 3075 tp1 = NULL; 3076 break; 3077 } 3078 } 3079 if (tp1 == NULL) { 3080 /* 3081 * Do it the other way , aka without paying 3082 * attention to queue seq order. 3083 */ 3084 SCTP_STAT_INCR(sctps_pdrpdnfnd); 3085 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3086 if (tp1->rec.data.tsn == tsn) { 3087 /* found it */ 3088 break; 3089 } 3090 } 3091 } 3092 if (tp1 == NULL) { 3093 SCTP_STAT_INCR(sctps_pdrptsnnf); 3094 } 3095 if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) { 3096 if (((flg & SCTP_BADCRC) == 0) && 3097 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3098 return (0); 3099 } 3100 if ((stcb->asoc.peers_rwnd == 0) && 3101 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3102 SCTP_STAT_INCR(sctps_pdrpdiwnp); 3103 return (0); 3104 } 3105 if (stcb->asoc.peers_rwnd == 0 && 3106 (flg & SCTP_FROM_MIDDLE_BOX)) { 3107 SCTP_STAT_INCR(sctps_pdrpdizrw); 3108 return (0); 3109 } 3110 if ((uint32_t)SCTP_BUF_LEN(tp1->data) < 3111 SCTP_DATA_CHUNK_OVERHEAD(stcb) + SCTP_NUM_DB_TO_VERIFY) { 3112 /* Payload not matching. */ 3113 SCTP_STAT_INCR(sctps_pdrpbadd); 3114 return (-1); 3115 } 3116 if (memcmp(mtod(tp1->data, caddr_t)+SCTP_DATA_CHUNK_OVERHEAD(stcb), 3117 desc->data_bytes, SCTP_NUM_DB_TO_VERIFY) != 0) { 3118 /* Payload not matching. */ 3119 SCTP_STAT_INCR(sctps_pdrpbadd); 3120 return (-1); 3121 } 3122 if (tp1->do_rtt) { 3123 /* 3124 * this guy had a RTO calculation 3125 * pending on it, cancel it 3126 */ 3127 if (tp1->whoTo->rto_needed == 0) { 3128 tp1->whoTo->rto_needed = 1; 3129 } 3130 tp1->do_rtt = 0; 3131 } 3132 SCTP_STAT_INCR(sctps_pdrpmark); 3133 if (tp1->sent != SCTP_DATAGRAM_RESEND) 3134 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3135 /* 3136 * mark it as if we were doing a FR, since 3137 * we will be getting gap ack reports behind 3138 * the info from the router. 3139 */ 3140 tp1->rec.data.doing_fast_retransmit = 1; 3141 /* 3142 * mark the tsn with what sequences can 3143 * cause a new FR. 3144 */ 3145 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) { 3146 tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq; 3147 } else { 3148 tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.tsn; 3149 } 3150 3151 /* restart the timer */ 3152 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3153 stcb, tp1->whoTo, 3154 SCTP_FROM_SCTP_INPUT + SCTP_LOC_26); 3155 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3156 stcb, tp1->whoTo); 3157 3158 /* fix counts and things */ 3159 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 3160 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP, 3161 tp1->whoTo->flight_size, 3162 tp1->book_size, 3163 (uint32_t)(uintptr_t)stcb, 3164 tp1->rec.data.tsn); 3165 } 3166 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3167 sctp_flight_size_decrease(tp1); 3168 sctp_total_flight_decrease(stcb, tp1); 3169 } 3170 tp1->sent = SCTP_DATAGRAM_RESEND; 3171 } { 3172 /* audit code */ 3173 unsigned int audit; 3174 3175 audit = 0; 3176 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3177 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3178 audit++; 3179 } 3180 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue, 3181 sctp_next) { 3182 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3183 audit++; 3184 } 3185 if (audit != stcb->asoc.sent_queue_retran_cnt) { 3186 SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n", 3187 audit, stcb->asoc.sent_queue_retran_cnt); 3188 #ifndef SCTP_AUDITING_ENABLED 3189 stcb->asoc.sent_queue_retran_cnt = audit; 3190 #endif 3191 } 3192 } 3193 } 3194 break; 3195 case SCTP_ASCONF: 3196 { 3197 struct sctp_tmit_chunk *asconf; 3198 3199 TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue, 3200 sctp_next) { 3201 if (asconf->rec.chunk_id.id == SCTP_ASCONF) { 3202 break; 3203 } 3204 } 3205 if (asconf) { 3206 if (asconf->sent != SCTP_DATAGRAM_RESEND) 3207 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3208 asconf->sent = SCTP_DATAGRAM_RESEND; 3209 asconf->snd_count--; 3210 } 3211 } 3212 break; 3213 case SCTP_INITIATION: 3214 /* resend the INIT */ 3215 stcb->asoc.dropped_special_cnt++; 3216 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) { 3217 /* 3218 * If we can get it in, in a few attempts we do 3219 * this, otherwise we let the timer fire. 3220 */ 3221 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, 3222 stcb, net, 3223 SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 3224 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 3225 } 3226 break; 3227 case SCTP_SELECTIVE_ACK: 3228 case SCTP_NR_SELECTIVE_ACK: 3229 /* resend the sack */ 3230 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED); 3231 break; 3232 case SCTP_HEARTBEAT_REQUEST: 3233 /* resend a demand HB */ 3234 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) { 3235 /* 3236 * Only retransmit if we KNOW we wont destroy the 3237 * tcb 3238 */ 3239 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 3240 } 3241 break; 3242 case SCTP_SHUTDOWN: 3243 sctp_send_shutdown(stcb, net); 3244 break; 3245 case SCTP_SHUTDOWN_ACK: 3246 sctp_send_shutdown_ack(stcb, net); 3247 break; 3248 case SCTP_COOKIE_ECHO: 3249 { 3250 struct sctp_tmit_chunk *cookie; 3251 3252 cookie = NULL; 3253 TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, 3254 sctp_next) { 3255 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) { 3256 break; 3257 } 3258 } 3259 if (cookie) { 3260 if (cookie->sent != SCTP_DATAGRAM_RESEND) 3261 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3262 cookie->sent = SCTP_DATAGRAM_RESEND; 3263 sctp_stop_all_cookie_timers(stcb); 3264 } 3265 } 3266 break; 3267 case SCTP_COOKIE_ACK: 3268 sctp_send_cookie_ack(stcb); 3269 break; 3270 case SCTP_ASCONF_ACK: 3271 /* resend last asconf ack */ 3272 sctp_send_asconf_ack(stcb); 3273 break; 3274 case SCTP_IFORWARD_CUM_TSN: 3275 case SCTP_FORWARD_CUM_TSN: 3276 send_forward_tsn(stcb, &stcb->asoc); 3277 break; 3278 /* can't do anything with these */ 3279 case SCTP_PACKET_DROPPED: 3280 case SCTP_INITIATION_ACK: /* this should not happen */ 3281 case SCTP_HEARTBEAT_ACK: 3282 case SCTP_ABORT_ASSOCIATION: 3283 case SCTP_OPERATION_ERROR: 3284 case SCTP_SHUTDOWN_COMPLETE: 3285 case SCTP_ECN_ECHO: 3286 case SCTP_ECN_CWR: 3287 default: 3288 break; 3289 } 3290 return (0); 3291 } 3292 3293 void 3294 sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list) 3295 { 3296 uint32_t i; 3297 uint16_t temp; 3298 3299 /* 3300 * We set things to 0xffffffff since this is the last delivered 3301 * sequence and we will be sending in 0 after the reset. 3302 */ 3303 3304 if (number_entries) { 3305 for (i = 0; i < number_entries; i++) { 3306 temp = ntohs(list[i]); 3307 if (temp >= stcb->asoc.streamincnt) { 3308 continue; 3309 } 3310 stcb->asoc.strmin[temp].last_mid_delivered = 0xffffffff; 3311 } 3312 } else { 3313 list = NULL; 3314 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3315 stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff; 3316 } 3317 } 3318 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3319 } 3320 3321 static void 3322 sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list) 3323 { 3324 uint32_t i; 3325 uint16_t temp; 3326 3327 if (number_entries > 0) { 3328 for (i = 0; i < number_entries; i++) { 3329 temp = ntohs(list[i]); 3330 if (temp >= stcb->asoc.streamoutcnt) { 3331 /* no such stream */ 3332 continue; 3333 } 3334 stcb->asoc.strmout[temp].next_mid_ordered = 0; 3335 stcb->asoc.strmout[temp].next_mid_unordered = 0; 3336 } 3337 } else { 3338 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3339 stcb->asoc.strmout[i].next_mid_ordered = 0; 3340 stcb->asoc.strmout[i].next_mid_unordered = 0; 3341 } 3342 } 3343 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3344 } 3345 3346 static void 3347 sctp_reset_clear_pending(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list) 3348 { 3349 uint32_t i; 3350 uint16_t temp; 3351 3352 if (number_entries > 0) { 3353 for (i = 0; i < number_entries; i++) { 3354 temp = ntohs(list[i]); 3355 if (temp >= stcb->asoc.streamoutcnt) { 3356 /* no such stream */ 3357 continue; 3358 } 3359 stcb->asoc.strmout[temp].state = SCTP_STREAM_OPEN; 3360 } 3361 } else { 3362 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3363 stcb->asoc.strmout[i].state = SCTP_STREAM_OPEN; 3364 } 3365 } 3366 } 3367 3368 struct sctp_stream_reset_request * 3369 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk) 3370 { 3371 struct sctp_association *asoc; 3372 struct sctp_chunkhdr *ch; 3373 struct sctp_stream_reset_request *r; 3374 struct sctp_tmit_chunk *chk; 3375 int len, clen; 3376 3377 asoc = &stcb->asoc; 3378 chk = asoc->str_reset; 3379 if (TAILQ_EMPTY(&asoc->control_send_queue) || 3380 (chk == NULL)) { 3381 asoc->stream_reset_outstanding = 0; 3382 return (NULL); 3383 } 3384 if (chk->data == NULL) { 3385 return (NULL); 3386 } 3387 if (bchk != NULL) { 3388 /* he wants a copy of the chk pointer */ 3389 *bchk = chk; 3390 } 3391 clen = chk->send_size; 3392 ch = mtod(chk->data, struct sctp_chunkhdr *); 3393 r = (struct sctp_stream_reset_request *)(ch + 1); 3394 if (ntohl(r->request_seq) == seq) { 3395 /* found it */ 3396 return (r); 3397 } 3398 len = SCTP_SIZE32(ntohs(r->ph.param_length)); 3399 if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) { 3400 /* move to the next one, there can only be a max of two */ 3401 r = (struct sctp_stream_reset_request *)((caddr_t)r + len); 3402 if (ntohl(r->request_seq) == seq) { 3403 return (r); 3404 } 3405 } 3406 /* that seq is not here */ 3407 return (NULL); 3408 } 3409 3410 static void 3411 sctp_clean_up_stream_reset(struct sctp_tcb *stcb) 3412 { 3413 struct sctp_association *asoc; 3414 struct sctp_tmit_chunk *chk; 3415 3416 asoc = &stcb->asoc; 3417 chk = asoc->str_reset; 3418 if (chk == NULL) { 3419 return; 3420 } 3421 asoc->str_reset = NULL; 3422 sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, 3423 NULL, SCTP_FROM_SCTP_INPUT + SCTP_LOC_28); 3424 TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next); 3425 asoc->ctrl_queue_cnt--; 3426 if (chk->data) { 3427 sctp_m_freem(chk->data); 3428 chk->data = NULL; 3429 } 3430 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3431 } 3432 3433 static int 3434 sctp_handle_stream_reset_response(struct sctp_tcb *stcb, 3435 uint32_t seq, uint32_t action, 3436 struct sctp_stream_reset_response *respin) 3437 { 3438 uint16_t type; 3439 int lparam_len; 3440 struct sctp_association *asoc = &stcb->asoc; 3441 struct sctp_tmit_chunk *chk; 3442 struct sctp_stream_reset_request *req_param; 3443 struct sctp_stream_reset_out_request *req_out_param; 3444 struct sctp_stream_reset_in_request *req_in_param; 3445 uint32_t number_entries; 3446 3447 if (asoc->stream_reset_outstanding == 0) { 3448 /* duplicate */ 3449 return (0); 3450 } 3451 if (seq == stcb->asoc.str_reset_seq_out) { 3452 req_param = sctp_find_stream_reset(stcb, seq, &chk); 3453 if (req_param != NULL) { 3454 stcb->asoc.str_reset_seq_out++; 3455 type = ntohs(req_param->ph.param_type); 3456 lparam_len = ntohs(req_param->ph.param_length); 3457 if (type == SCTP_STR_RESET_OUT_REQUEST) { 3458 int no_clear = 0; 3459 3460 req_out_param = (struct sctp_stream_reset_out_request *)req_param; 3461 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t); 3462 asoc->stream_reset_out_is_outstanding = 0; 3463 if (asoc->stream_reset_outstanding) 3464 asoc->stream_reset_outstanding--; 3465 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3466 /* do it */ 3467 sctp_reset_out_streams(stcb, number_entries, req_out_param->list_of_streams); 3468 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3469 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3470 } else if (action == SCTP_STREAM_RESET_RESULT_IN_PROGRESS) { 3471 /* 3472 * Set it up so we don't stop 3473 * retransmitting 3474 */ 3475 asoc->stream_reset_outstanding++; 3476 stcb->asoc.str_reset_seq_out--; 3477 asoc->stream_reset_out_is_outstanding = 1; 3478 no_clear = 1; 3479 } else { 3480 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3481 } 3482 if (no_clear == 0) { 3483 sctp_reset_clear_pending(stcb, number_entries, req_out_param->list_of_streams); 3484 } 3485 } else if (type == SCTP_STR_RESET_IN_REQUEST) { 3486 req_in_param = (struct sctp_stream_reset_in_request *)req_param; 3487 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t); 3488 if (asoc->stream_reset_outstanding) 3489 asoc->stream_reset_outstanding--; 3490 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3491 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb, 3492 number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3493 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3494 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb, 3495 number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3496 } 3497 } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) { 3498 /* Ok we now may have more streams */ 3499 int num_stream; 3500 3501 num_stream = stcb->asoc.strm_pending_add_size; 3502 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) { 3503 /* TSNH */ 3504 num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt; 3505 } 3506 stcb->asoc.strm_pending_add_size = 0; 3507 if (asoc->stream_reset_outstanding) 3508 asoc->stream_reset_outstanding--; 3509 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3510 /* Put the new streams into effect */ 3511 int i; 3512 3513 for (i = asoc->streamoutcnt; i < (asoc->streamoutcnt + num_stream); i++) { 3514 asoc->strmout[i].state = SCTP_STREAM_OPEN; 3515 } 3516 asoc->streamoutcnt += num_stream; 3517 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 3518 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3519 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3520 SCTP_STREAM_CHANGE_DENIED); 3521 } else { 3522 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3523 SCTP_STREAM_CHANGE_FAILED); 3524 } 3525 } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) { 3526 if (asoc->stream_reset_outstanding) 3527 asoc->stream_reset_outstanding--; 3528 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3529 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3530 SCTP_STREAM_CHANGE_DENIED); 3531 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3532 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3533 SCTP_STREAM_CHANGE_FAILED); 3534 } 3535 } else if (type == SCTP_STR_RESET_TSN_REQUEST) { 3536 /** 3537 * a) Adopt the new in tsn. 3538 * b) reset the map 3539 * c) Adopt the new out-tsn 3540 */ 3541 struct sctp_stream_reset_response_tsn *resp; 3542 struct sctp_forward_tsn_chunk fwdtsn; 3543 int abort_flag = 0; 3544 3545 if (respin == NULL) { 3546 /* huh ? */ 3547 return (0); 3548 } 3549 if (ntohs(respin->ph.param_length) < sizeof(struct sctp_stream_reset_response_tsn)) { 3550 return (0); 3551 } 3552 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3553 resp = (struct sctp_stream_reset_response_tsn *)respin; 3554 asoc->stream_reset_outstanding--; 3555 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3556 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3557 fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1); 3558 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3559 if (abort_flag) { 3560 return (1); 3561 } 3562 stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1); 3563 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3564 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3565 } 3566 3567 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 3568 stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn); 3569 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 3570 3571 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map; 3572 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size); 3573 3574 stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn); 3575 stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn; 3576 3577 sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL); 3578 sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL); 3579 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0); 3580 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3581 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3582 SCTP_ASSOC_RESET_DENIED); 3583 } else { 3584 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3585 SCTP_ASSOC_RESET_FAILED); 3586 } 3587 } 3588 /* get rid of the request and get the request flags */ 3589 if (asoc->stream_reset_outstanding == 0) { 3590 sctp_clean_up_stream_reset(stcb); 3591 } 3592 } 3593 } 3594 if (asoc->stream_reset_outstanding == 0) { 3595 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED); 3596 } 3597 return (0); 3598 } 3599 3600 static void 3601 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb, 3602 struct sctp_tmit_chunk *chk, 3603 struct sctp_stream_reset_in_request *req, int trunc) 3604 { 3605 uint32_t seq; 3606 int len, i; 3607 int number_entries; 3608 uint16_t temp; 3609 3610 /* 3611 * peer wants me to send a str-reset to him for my outgoing seq's if 3612 * seq_in is right. 3613 */ 3614 struct sctp_association *asoc = &stcb->asoc; 3615 3616 seq = ntohl(req->request_seq); 3617 if (asoc->str_reset_seq_in == seq) { 3618 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3619 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3620 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3621 } else if (trunc) { 3622 /* Can't do it, since they exceeded our buffer size */ 3623 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3624 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) { 3625 len = ntohs(req->ph.param_length); 3626 number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t)); 3627 if (number_entries) { 3628 for (i = 0; i < number_entries; i++) { 3629 temp = ntohs(req->list_of_streams[i]); 3630 if (temp >= stcb->asoc.streamoutcnt) { 3631 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3632 goto bad_boy; 3633 } 3634 req->list_of_streams[i] = temp; 3635 } 3636 for (i = 0; i < number_entries; i++) { 3637 if (stcb->asoc.strmout[req->list_of_streams[i]].state == SCTP_STREAM_OPEN) { 3638 stcb->asoc.strmout[req->list_of_streams[i]].state = SCTP_STREAM_RESET_PENDING; 3639 } 3640 } 3641 } else { 3642 /* Its all */ 3643 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3644 if (stcb->asoc.strmout[i].state == SCTP_STREAM_OPEN) 3645 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_PENDING; 3646 } 3647 } 3648 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3649 } else { 3650 /* Can't do it, since we have sent one out */ 3651 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 3652 } 3653 bad_boy: 3654 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3655 asoc->str_reset_seq_in++; 3656 } else if (asoc->str_reset_seq_in - 1 == seq) { 3657 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3658 } else if (asoc->str_reset_seq_in - 2 == seq) { 3659 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3660 } else { 3661 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3662 } 3663 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED); 3664 } 3665 3666 static int 3667 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb, 3668 struct sctp_tmit_chunk *chk, 3669 struct sctp_stream_reset_tsn_request *req) 3670 { 3671 /* reset all in and out and update the tsn */ 3672 /* 3673 * A) reset my str-seq's on in and out. B) Select a receive next, 3674 * and set cum-ack to it. Also process this selected number as a 3675 * fwd-tsn as well. C) set in the response my next sending seq. 3676 */ 3677 struct sctp_forward_tsn_chunk fwdtsn; 3678 struct sctp_association *asoc = &stcb->asoc; 3679 int abort_flag = 0; 3680 uint32_t seq; 3681 3682 seq = ntohl(req->request_seq); 3683 if (asoc->str_reset_seq_in == seq) { 3684 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3685 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 3686 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3687 } else { 3688 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3689 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3690 fwdtsn.ch.chunk_flags = 0; 3691 fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1); 3692 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3693 if (abort_flag) { 3694 return (1); 3695 } 3696 asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA; 3697 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3698 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3699 } 3700 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map; 3701 asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1; 3702 memset(asoc->mapping_array, 0, asoc->mapping_array_size); 3703 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 3704 memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size); 3705 atomic_add_int(&asoc->sending_seq, 1); 3706 /* save off historical data for retrans */ 3707 asoc->last_sending_seq[1] = asoc->last_sending_seq[0]; 3708 asoc->last_sending_seq[0] = asoc->sending_seq; 3709 asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0]; 3710 asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn; 3711 sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL); 3712 sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL); 3713 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3714 sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0); 3715 } 3716 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3717 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3718 asoc->str_reset_seq_in++; 3719 } else if (asoc->str_reset_seq_in - 1 == seq) { 3720 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3721 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3722 } else if (asoc->str_reset_seq_in - 2 == seq) { 3723 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1], 3724 asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]); 3725 } else { 3726 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3727 } 3728 return (0); 3729 } 3730 3731 static void 3732 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb, 3733 struct sctp_tmit_chunk *chk, 3734 struct sctp_stream_reset_out_request *req, int trunc) 3735 { 3736 uint32_t seq, tsn; 3737 int number_entries, len; 3738 struct sctp_association *asoc = &stcb->asoc; 3739 3740 seq = ntohl(req->request_seq); 3741 3742 /* now if its not a duplicate we process it */ 3743 if (asoc->str_reset_seq_in == seq) { 3744 len = ntohs(req->ph.param_length); 3745 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t)); 3746 /* 3747 * the sender is resetting, handle the list issue.. we must 3748 * a) verify if we can do the reset, if so no problem b) If 3749 * we can't do the reset we must copy the request. c) queue 3750 * it, and setup the data in processor to trigger it off 3751 * when needed and dequeue all the queued data. 3752 */ 3753 tsn = ntohl(req->send_reset_at_tsn); 3754 3755 /* move the reset action back one */ 3756 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3757 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3758 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3759 } else if (trunc) { 3760 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3761 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) { 3762 /* we can do it now */ 3763 sctp_reset_in_stream(stcb, number_entries, req->list_of_streams); 3764 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3765 } else { 3766 /* 3767 * we must queue it up and thus wait for the TSN's 3768 * to arrive that are at or before tsn 3769 */ 3770 struct sctp_stream_reset_list *liste; 3771 int siz; 3772 3773 siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t)); 3774 SCTP_MALLOC(liste, struct sctp_stream_reset_list *, 3775 siz, SCTP_M_STRESET); 3776 if (liste == NULL) { 3777 /* gak out of memory */ 3778 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3779 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3780 return; 3781 } 3782 liste->seq = seq; 3783 liste->tsn = tsn; 3784 liste->number_entries = number_entries; 3785 memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t)); 3786 TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp); 3787 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_IN_PROGRESS; 3788 } 3789 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3790 asoc->str_reset_seq_in++; 3791 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3792 /* 3793 * one seq back, just echo back last action since my 3794 * response was lost. 3795 */ 3796 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3797 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3798 /* 3799 * two seq back, just echo back last action since my 3800 * response was lost. 3801 */ 3802 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3803 } else { 3804 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3805 } 3806 } 3807 3808 static void 3809 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 3810 struct sctp_stream_reset_add_strm *str_add) 3811 { 3812 /* 3813 * Peer is requesting to add more streams. If its within our 3814 * max-streams we will allow it. 3815 */ 3816 uint32_t num_stream, i; 3817 uint32_t seq; 3818 struct sctp_association *asoc = &stcb->asoc; 3819 struct sctp_queued_to_read *ctl, *nctl; 3820 3821 /* Get the number. */ 3822 seq = ntohl(str_add->request_seq); 3823 num_stream = ntohs(str_add->number_of_streams); 3824 /* Now what would be the new total? */ 3825 if (asoc->str_reset_seq_in == seq) { 3826 num_stream += stcb->asoc.streamincnt; 3827 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3828 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 3829 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3830 } else if ((num_stream > stcb->asoc.max_inbound_streams) || 3831 (num_stream > 0xffff)) { 3832 /* We must reject it they ask for to many */ 3833 denied: 3834 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3835 } else { 3836 /* Ok, we can do that :-) */ 3837 struct sctp_stream_in *oldstrm; 3838 3839 /* save off the old */ 3840 oldstrm = stcb->asoc.strmin; 3841 SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *, 3842 (num_stream * sizeof(struct sctp_stream_in)), 3843 SCTP_M_STRMI); 3844 if (stcb->asoc.strmin == NULL) { 3845 stcb->asoc.strmin = oldstrm; 3846 goto denied; 3847 } 3848 /* copy off the old data */ 3849 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3850 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 3851 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue); 3852 stcb->asoc.strmin[i].sid = i; 3853 stcb->asoc.strmin[i].last_mid_delivered = oldstrm[i].last_mid_delivered; 3854 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started; 3855 stcb->asoc.strmin[i].pd_api_started = oldstrm[i].pd_api_started; 3856 /* now anything on those queues? */ 3857 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next_instrm, nctl) { 3858 TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next_instrm); 3859 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next_instrm); 3860 } 3861 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].uno_inqueue, next_instrm, nctl) { 3862 TAILQ_REMOVE(&oldstrm[i].uno_inqueue, ctl, next_instrm); 3863 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].uno_inqueue, ctl, next_instrm); 3864 } 3865 } 3866 /* Init the new streams */ 3867 for (i = stcb->asoc.streamincnt; i < num_stream; i++) { 3868 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 3869 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue); 3870 stcb->asoc.strmin[i].sid = i; 3871 stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff; 3872 stcb->asoc.strmin[i].pd_api_started = 0; 3873 stcb->asoc.strmin[i].delivery_started = 0; 3874 } 3875 SCTP_FREE(oldstrm, SCTP_M_STRMI); 3876 /* update the size */ 3877 stcb->asoc.streamincnt = num_stream; 3878 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3879 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 3880 } 3881 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3882 asoc->str_reset_seq_in++; 3883 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3884 /* 3885 * one seq back, just echo back last action since my 3886 * response was lost. 3887 */ 3888 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3889 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3890 /* 3891 * two seq back, just echo back last action since my 3892 * response was lost. 3893 */ 3894 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3895 } else { 3896 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3897 } 3898 } 3899 3900 static void 3901 sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 3902 struct sctp_stream_reset_add_strm *str_add) 3903 { 3904 /* 3905 * Peer is requesting to add more streams. If its within our 3906 * max-streams we will allow it. 3907 */ 3908 uint16_t num_stream; 3909 uint32_t seq; 3910 struct sctp_association *asoc = &stcb->asoc; 3911 3912 /* Get the number. */ 3913 seq = ntohl(str_add->request_seq); 3914 num_stream = ntohs(str_add->number_of_streams); 3915 /* Now what would be the new total? */ 3916 if (asoc->str_reset_seq_in == seq) { 3917 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3918 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 3919 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3920 } else if (stcb->asoc.stream_reset_outstanding) { 3921 /* We must reject it we have something pending */ 3922 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 3923 } else { 3924 /* Ok, we can do that :-) */ 3925 int mychk; 3926 3927 mychk = stcb->asoc.streamoutcnt; 3928 mychk += num_stream; 3929 if (mychk < 0x10000) { 3930 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3931 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 1, num_stream, 0, 1)) { 3932 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3933 } 3934 } else { 3935 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3936 } 3937 } 3938 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]); 3939 asoc->str_reset_seq_in++; 3940 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3941 /* 3942 * one seq back, just echo back last action since my 3943 * response was lost. 3944 */ 3945 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3946 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3947 /* 3948 * two seq back, just echo back last action since my 3949 * response was lost. 3950 */ 3951 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3952 } else { 3953 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3954 } 3955 } 3956 3957 #ifdef __GNUC__ 3958 __attribute__((noinline)) 3959 #endif 3960 static int 3961 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset, 3962 struct sctp_chunkhdr *ch_req) 3963 { 3964 uint16_t remaining_length, param_len, ptype; 3965 struct sctp_paramhdr pstore; 3966 uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE]; 3967 uint32_t seq = 0; 3968 int num_req = 0; 3969 int trunc = 0; 3970 struct sctp_tmit_chunk *chk; 3971 struct sctp_chunkhdr *ch; 3972 struct sctp_paramhdr *ph; 3973 int ret_code = 0; 3974 int num_param = 0; 3975 3976 /* now it may be a reset or a reset-response */ 3977 remaining_length = ntohs(ch_req->chunk_length) - sizeof(struct sctp_chunkhdr); 3978 3979 /* setup for adding the response */ 3980 sctp_alloc_a_chunk(stcb, chk); 3981 if (chk == NULL) { 3982 return (ret_code); 3983 } 3984 chk->copy_by_ref = 0; 3985 chk->rec.chunk_id.id = SCTP_STREAM_RESET; 3986 chk->rec.chunk_id.can_take_data = 0; 3987 chk->flags = 0; 3988 chk->asoc = &stcb->asoc; 3989 chk->no_fr_allowed = 0; 3990 chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr); 3991 chk->book_size_scale = 0; 3992 chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA); 3993 if (chk->data == NULL) { 3994 strres_nochunk: 3995 if (chk->data) { 3996 sctp_m_freem(chk->data); 3997 chk->data = NULL; 3998 } 3999 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 4000 return (ret_code); 4001 } 4002 SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD); 4003 4004 /* setup chunk parameters */ 4005 chk->sent = SCTP_DATAGRAM_UNSENT; 4006 chk->snd_count = 0; 4007 chk->whoTo = NULL; 4008 4009 ch = mtod(chk->data, struct sctp_chunkhdr *); 4010 ch->chunk_type = SCTP_STREAM_RESET; 4011 ch->chunk_flags = 0; 4012 ch->chunk_length = htons(chk->send_size); 4013 SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size); 4014 offset += sizeof(struct sctp_chunkhdr); 4015 while (remaining_length >= sizeof(struct sctp_paramhdr)) { 4016 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *)&pstore); 4017 if (ph == NULL) { 4018 /* TSNH */ 4019 break; 4020 } 4021 param_len = ntohs(ph->param_length); 4022 if ((param_len > remaining_length) || 4023 (param_len < (sizeof(struct sctp_paramhdr) + sizeof(uint32_t)))) { 4024 /* bad parameter length */ 4025 break; 4026 } 4027 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, sizeof(cstore)), 4028 (uint8_t *)&cstore); 4029 if (ph == NULL) { 4030 /* TSNH */ 4031 break; 4032 } 4033 ptype = ntohs(ph->param_type); 4034 num_param++; 4035 if (param_len > sizeof(cstore)) { 4036 trunc = 1; 4037 } else { 4038 trunc = 0; 4039 } 4040 if (num_param > SCTP_MAX_RESET_PARAMS) { 4041 /* hit the max of parameters already sorry.. */ 4042 break; 4043 } 4044 if (ptype == SCTP_STR_RESET_OUT_REQUEST) { 4045 struct sctp_stream_reset_out_request *req_out; 4046 4047 if (param_len < sizeof(struct sctp_stream_reset_out_request)) { 4048 break; 4049 } 4050 req_out = (struct sctp_stream_reset_out_request *)ph; 4051 num_req++; 4052 if (stcb->asoc.stream_reset_outstanding) { 4053 seq = ntohl(req_out->response_seq); 4054 if (seq == stcb->asoc.str_reset_seq_out) { 4055 /* implicit ack */ 4056 (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL); 4057 } 4058 } 4059 sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc); 4060 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) { 4061 struct sctp_stream_reset_add_strm *str_add; 4062 4063 if (param_len < sizeof(struct sctp_stream_reset_add_strm)) { 4064 break; 4065 } 4066 str_add = (struct sctp_stream_reset_add_strm *)ph; 4067 num_req++; 4068 sctp_handle_str_reset_add_strm(stcb, chk, str_add); 4069 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) { 4070 struct sctp_stream_reset_add_strm *str_add; 4071 4072 if (param_len < sizeof(struct sctp_stream_reset_add_strm)) { 4073 break; 4074 } 4075 str_add = (struct sctp_stream_reset_add_strm *)ph; 4076 num_req++; 4077 sctp_handle_str_reset_add_out_strm(stcb, chk, str_add); 4078 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) { 4079 struct sctp_stream_reset_in_request *req_in; 4080 4081 num_req++; 4082 req_in = (struct sctp_stream_reset_in_request *)ph; 4083 sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc); 4084 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) { 4085 struct sctp_stream_reset_tsn_request *req_tsn; 4086 4087 num_req++; 4088 req_tsn = (struct sctp_stream_reset_tsn_request *)ph; 4089 if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) { 4090 ret_code = 1; 4091 goto strres_nochunk; 4092 } 4093 /* no more */ 4094 break; 4095 } else if (ptype == SCTP_STR_RESET_RESPONSE) { 4096 struct sctp_stream_reset_response *resp; 4097 uint32_t result; 4098 4099 if (param_len < sizeof(struct sctp_stream_reset_response)) { 4100 break; 4101 } 4102 resp = (struct sctp_stream_reset_response *)ph; 4103 seq = ntohl(resp->response_seq); 4104 result = ntohl(resp->result); 4105 if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) { 4106 ret_code = 1; 4107 goto strres_nochunk; 4108 } 4109 } else { 4110 break; 4111 } 4112 offset += SCTP_SIZE32(param_len); 4113 if (remaining_length >= SCTP_SIZE32(param_len)) { 4114 remaining_length -= SCTP_SIZE32(param_len); 4115 } else { 4116 remaining_length = 0; 4117 } 4118 } 4119 if (num_req == 0) { 4120 /* we have no response free the stuff */ 4121 goto strres_nochunk; 4122 } 4123 /* ok we have a chunk to link in */ 4124 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, 4125 chk, 4126 sctp_next); 4127 stcb->asoc.ctrl_queue_cnt++; 4128 return (ret_code); 4129 } 4130 4131 /* 4132 * Handle a router or endpoints report of a packet loss, there are two ways 4133 * to handle this, either we get the whole packet and must disect it 4134 * ourselves (possibly with truncation and or corruption) or it is a summary 4135 * from a middle box that did the disecting for us. 4136 */ 4137 static void 4138 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp, 4139 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 4140 { 4141 struct sctp_chunk_desc desc; 4142 struct sctp_chunkhdr *chk_hdr; 4143 struct sctp_data_chunk *data_chunk; 4144 struct sctp_idata_chunk *idata_chunk; 4145 uint32_t bottle_bw, on_queue; 4146 uint32_t offset, chk_len; 4147 uint16_t pktdrp_len; 4148 uint8_t pktdrp_flags; 4149 4150 KASSERT(sizeof(struct sctp_pktdrop_chunk) <= limit, 4151 ("PKTDROP chunk too small")); 4152 pktdrp_flags = cp->ch.chunk_flags; 4153 pktdrp_len = ntohs(cp->ch.chunk_length); 4154 KASSERT(limit <= pktdrp_len, ("Inconsistent limit")); 4155 if (pktdrp_flags & SCTP_PACKET_TRUNCATED) { 4156 if (ntohs(cp->trunc_len) <= pktdrp_len - sizeof(struct sctp_pktdrop_chunk)) { 4157 /* The peer plays games with us. */ 4158 return; 4159 } 4160 } 4161 limit -= sizeof(struct sctp_pktdrop_chunk); 4162 offset = 0; 4163 if (offset == limit) { 4164 if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) { 4165 SCTP_STAT_INCR(sctps_pdrpbwrpt); 4166 } 4167 } else if (offset + sizeof(struct sctphdr) > limit) { 4168 /* Only a partial SCTP common header. */ 4169 SCTP_STAT_INCR(sctps_pdrpcrupt); 4170 offset = limit; 4171 } else { 4172 /* XXX: Check embedded SCTP common header. */ 4173 offset += sizeof(struct sctphdr); 4174 } 4175 /* Now parse through the chunks themselves. */ 4176 while (offset < limit) { 4177 if (offset + sizeof(struct sctp_chunkhdr) > limit) { 4178 SCTP_STAT_INCR(sctps_pdrpcrupt); 4179 break; 4180 } 4181 chk_hdr = (struct sctp_chunkhdr *)(cp->data + offset); 4182 desc.chunk_type = chk_hdr->chunk_type; 4183 /* get amount we need to move */ 4184 chk_len = (uint32_t)ntohs(chk_hdr->chunk_length); 4185 if (chk_len < sizeof(struct sctp_chunkhdr)) { 4186 /* Someone is lying... */ 4187 break; 4188 } 4189 if (desc.chunk_type == SCTP_DATA) { 4190 if (stcb->asoc.idata_supported) { 4191 /* Some is playing games with us. */ 4192 break; 4193 } 4194 if (chk_len <= sizeof(struct sctp_data_chunk)) { 4195 /* Some is playing games with us. */ 4196 break; 4197 } 4198 if (chk_len < sizeof(struct sctp_data_chunk) + SCTP_NUM_DB_TO_VERIFY) { 4199 /* 4200 * Not enough data bytes available in the 4201 * chunk. 4202 */ 4203 SCTP_STAT_INCR(sctps_pdrpnedat); 4204 goto next_chunk; 4205 } 4206 if (offset + sizeof(struct sctp_data_chunk) + SCTP_NUM_DB_TO_VERIFY > limit) { 4207 /* Not enough data in buffer. */ 4208 break; 4209 } 4210 data_chunk = (struct sctp_data_chunk *)(cp->data + offset); 4211 memcpy(desc.data_bytes, data_chunk + 1, SCTP_NUM_DB_TO_VERIFY); 4212 desc.tsn_ifany = data_chunk->dp.tsn; 4213 if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) { 4214 SCTP_STAT_INCR(sctps_pdrpmbda); 4215 } 4216 } else if (desc.chunk_type == SCTP_IDATA) { 4217 if (!stcb->asoc.idata_supported) { 4218 /* Some is playing games with us. */ 4219 break; 4220 } 4221 if (chk_len <= sizeof(struct sctp_idata_chunk)) { 4222 /* Some is playing games with us. */ 4223 break; 4224 } 4225 if (chk_len < sizeof(struct sctp_idata_chunk) + SCTP_NUM_DB_TO_VERIFY) { 4226 /* 4227 * Not enough data bytes available in the 4228 * chunk. 4229 */ 4230 SCTP_STAT_INCR(sctps_pdrpnedat); 4231 goto next_chunk; 4232 } 4233 if (offset + sizeof(struct sctp_idata_chunk) + SCTP_NUM_DB_TO_VERIFY > limit) { 4234 /* Not enough data in buffer. */ 4235 break; 4236 } 4237 idata_chunk = (struct sctp_idata_chunk *)(cp->data + offset); 4238 memcpy(desc.data_bytes, idata_chunk + 1, SCTP_NUM_DB_TO_VERIFY); 4239 desc.tsn_ifany = idata_chunk->dp.tsn; 4240 if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) { 4241 SCTP_STAT_INCR(sctps_pdrpmbda); 4242 } 4243 } else { 4244 if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) { 4245 SCTP_STAT_INCR(sctps_pdrpmbct); 4246 } 4247 } 4248 if (process_chunk_drop(stcb, &desc, net, pktdrp_flags)) { 4249 SCTP_STAT_INCR(sctps_pdrppdbrk); 4250 break; 4251 } 4252 next_chunk: 4253 offset += SCTP_SIZE32(chk_len); 4254 } 4255 /* Now update any rwnd --- possibly */ 4256 if ((pktdrp_flags & SCTP_FROM_MIDDLE_BOX) == 0) { 4257 /* From a peer, we get a rwnd report */ 4258 uint32_t a_rwnd; 4259 4260 SCTP_STAT_INCR(sctps_pdrpfehos); 4261 4262 bottle_bw = ntohl(cp->bottle_bw); 4263 on_queue = ntohl(cp->current_onq); 4264 if (bottle_bw && on_queue) { 4265 /* a rwnd report is in here */ 4266 if (bottle_bw > on_queue) 4267 a_rwnd = bottle_bw - on_queue; 4268 else 4269 a_rwnd = 0; 4270 4271 if (a_rwnd == 0) 4272 stcb->asoc.peers_rwnd = 0; 4273 else { 4274 if (a_rwnd > stcb->asoc.total_flight) { 4275 stcb->asoc.peers_rwnd = 4276 a_rwnd - stcb->asoc.total_flight; 4277 } else { 4278 stcb->asoc.peers_rwnd = 0; 4279 } 4280 if (stcb->asoc.peers_rwnd < 4281 stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 4282 /* SWS sender side engages */ 4283 stcb->asoc.peers_rwnd = 0; 4284 } 4285 } 4286 } 4287 } else { 4288 SCTP_STAT_INCR(sctps_pdrpfmbox); 4289 } 4290 4291 /* now middle boxes in sat networks get a cwnd bump */ 4292 if ((pktdrp_flags & SCTP_FROM_MIDDLE_BOX) && 4293 (stcb->asoc.sat_t3_loss_recovery == 0) && 4294 (stcb->asoc.sat_network)) { 4295 /* 4296 * This is debatable but for sat networks it makes sense 4297 * Note if a T3 timer has went off, we will prohibit any 4298 * changes to cwnd until we exit the t3 loss recovery. 4299 */ 4300 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb, 4301 net, cp, &bottle_bw, &on_queue); 4302 } 4303 } 4304 4305 /* 4306 * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to 4307 * still contain IP/SCTP header - stcb: is the tcb found for this packet - 4308 * offset: offset into the mbuf chain to first chunkhdr - length: is the 4309 * length of the complete packet outputs: - length: modified to remaining 4310 * length after control processing - netp: modified to new sctp_nets after 4311 * cookie-echo processing - return NULL to discard the packet (ie. no asoc, 4312 * bad packet,...) otherwise return the tcb for this packet 4313 */ 4314 #ifdef __GNUC__ 4315 __attribute__((noinline)) 4316 #endif 4317 static struct sctp_tcb * 4318 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length, 4319 struct sockaddr *src, struct sockaddr *dst, 4320 struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp, 4321 struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen, 4322 uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum, 4323 uint32_t vrf_id, uint16_t port) 4324 { 4325 struct sctp_association *asoc; 4326 struct mbuf *op_err; 4327 char msg[SCTP_DIAG_INFO_LEN]; 4328 uint32_t vtag_in; 4329 int num_chunks = 0; /* number of control chunks processed */ 4330 uint32_t chk_length, contiguous; 4331 int ret; 4332 int abort_no_unlock = 0; 4333 int ecne_seen = 0; 4334 int abort_flag; 4335 4336 /* 4337 * How big should this be, and should it be alloc'd? Lets try the 4338 * d-mtu-ceiling for now (2k) and that should hopefully work ... 4339 * until we get into jumbo grams and such.. 4340 */ 4341 uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE]; 4342 int got_auth = 0; 4343 uint32_t auth_offset = 0, auth_len = 0; 4344 int auth_skipped = 0; 4345 int asconf_cnt = 0; 4346 4347 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n", 4348 iphlen, *offset, length, (void *)stcb); 4349 4350 if (stcb) { 4351 SCTP_TCB_LOCK_ASSERT(stcb); 4352 } 4353 /* validate chunk header length... */ 4354 if (ntohs(ch->chunk_length) < sizeof(*ch)) { 4355 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n", 4356 ntohs(ch->chunk_length)); 4357 *offset = length; 4358 return (stcb); 4359 } 4360 /* 4361 * validate the verification tag 4362 */ 4363 vtag_in = ntohl(sh->v_tag); 4364 4365 if (ch->chunk_type == SCTP_INITIATION) { 4366 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n", 4367 ntohs(ch->chunk_length), vtag_in); 4368 if (vtag_in != 0) { 4369 /* protocol error- silently discard... */ 4370 SCTP_STAT_INCR(sctps_badvtag); 4371 if (stcb != NULL) { 4372 SCTP_TCB_UNLOCK(stcb); 4373 } 4374 return (NULL); 4375 } 4376 } else if (ch->chunk_type != SCTP_COOKIE_ECHO) { 4377 /* 4378 * If there is no stcb, skip the AUTH chunk and process 4379 * later after a stcb is found (to validate the lookup was 4380 * valid. 4381 */ 4382 if ((ch->chunk_type == SCTP_AUTHENTICATION) && 4383 (stcb == NULL) && 4384 (inp->auth_supported == 1)) { 4385 /* save this chunk for later processing */ 4386 auth_skipped = 1; 4387 auth_offset = *offset; 4388 auth_len = ntohs(ch->chunk_length); 4389 4390 /* (temporarily) move past this chunk */ 4391 *offset += SCTP_SIZE32(auth_len); 4392 if (*offset >= length) { 4393 /* no more data left in the mbuf chain */ 4394 *offset = length; 4395 return (NULL); 4396 } 4397 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4398 sizeof(struct sctp_chunkhdr), chunk_buf); 4399 } 4400 if (ch == NULL) { 4401 /* Help */ 4402 *offset = length; 4403 return (stcb); 4404 } 4405 if (ch->chunk_type == SCTP_COOKIE_ECHO) { 4406 goto process_control_chunks; 4407 } 4408 /* 4409 * first check if it's an ASCONF with an unknown src addr we 4410 * need to look inside to find the association 4411 */ 4412 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) { 4413 struct sctp_chunkhdr *asconf_ch = ch; 4414 uint32_t asconf_offset = 0, asconf_len = 0; 4415 4416 /* inp's refcount may be reduced */ 4417 SCTP_INP_INCR_REF(inp); 4418 4419 asconf_offset = *offset; 4420 do { 4421 asconf_len = ntohs(asconf_ch->chunk_length); 4422 if (asconf_len < sizeof(struct sctp_asconf_paramhdr)) 4423 break; 4424 stcb = sctp_findassociation_ep_asconf(m, 4425 *offset, 4426 dst, 4427 sh, &inp, netp, vrf_id); 4428 if (stcb != NULL) 4429 break; 4430 asconf_offset += SCTP_SIZE32(asconf_len); 4431 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset, 4432 sizeof(struct sctp_chunkhdr), chunk_buf); 4433 } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF); 4434 if (stcb == NULL) { 4435 /* 4436 * reduce inp's refcount if not reduced in 4437 * sctp_findassociation_ep_asconf(). 4438 */ 4439 SCTP_INP_DECR_REF(inp); 4440 } 4441 4442 /* now go back and verify any auth chunk to be sure */ 4443 if (auth_skipped && (stcb != NULL)) { 4444 struct sctp_auth_chunk *auth; 4445 4446 if (auth_len <= SCTP_CHUNK_BUFFER_SIZE) { 4447 auth = (struct sctp_auth_chunk *)sctp_m_getptr(m, auth_offset, auth_len, chunk_buf); 4448 got_auth = 1; 4449 auth_skipped = 0; 4450 } else { 4451 auth = NULL; 4452 } 4453 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, 4454 auth_offset)) { 4455 /* auth HMAC failed so dump it */ 4456 *offset = length; 4457 return (stcb); 4458 } else { 4459 /* remaining chunks are HMAC checked */ 4460 stcb->asoc.authenticated = 1; 4461 } 4462 } 4463 } 4464 if (stcb == NULL) { 4465 SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 4466 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4467 msg); 4468 /* no association, so it's out of the blue... */ 4469 sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, op_err, 4470 mflowtype, mflowid, inp->fibnum, 4471 vrf_id, port); 4472 *offset = length; 4473 return (NULL); 4474 } 4475 asoc = &stcb->asoc; 4476 /* ABORT and SHUTDOWN can use either v_tag... */ 4477 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) || 4478 (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) || 4479 (ch->chunk_type == SCTP_PACKET_DROPPED)) { 4480 /* Take the T-bit always into account. */ 4481 if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) && 4482 (vtag_in == asoc->my_vtag)) || 4483 (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) && 4484 (asoc->peer_vtag != htonl(0)) && 4485 (vtag_in == asoc->peer_vtag))) { 4486 /* this is valid */ 4487 } else { 4488 /* drop this packet... */ 4489 SCTP_STAT_INCR(sctps_badvtag); 4490 if (stcb != NULL) { 4491 SCTP_TCB_UNLOCK(stcb); 4492 } 4493 return (NULL); 4494 } 4495 } else { 4496 /* for all other chunks, vtag must match */ 4497 if (vtag_in != asoc->my_vtag) { 4498 /* invalid vtag... */ 4499 SCTPDBG(SCTP_DEBUG_INPUT3, 4500 "invalid vtag: %xh, expect %xh\n", 4501 vtag_in, asoc->my_vtag); 4502 SCTP_STAT_INCR(sctps_badvtag); 4503 if (stcb != NULL) { 4504 SCTP_TCB_UNLOCK(stcb); 4505 } 4506 *offset = length; 4507 return (NULL); 4508 } 4509 } 4510 } /* end if !SCTP_COOKIE_ECHO */ 4511 /* 4512 * process all control chunks... 4513 */ 4514 if (((ch->chunk_type == SCTP_SELECTIVE_ACK) || 4515 (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) || 4516 (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) && 4517 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 4518 /* implied cookie-ack.. we must have lost the ack */ 4519 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, 4520 *netp); 4521 } 4522 4523 process_control_chunks: 4524 while (IS_SCTP_CONTROL(ch)) { 4525 /* validate chunk length */ 4526 chk_length = ntohs(ch->chunk_length); 4527 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n", 4528 ch->chunk_type, chk_length); 4529 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length); 4530 if (chk_length < sizeof(*ch) || 4531 (*offset + (int)chk_length) > length) { 4532 *offset = length; 4533 return (stcb); 4534 } 4535 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks); 4536 /* 4537 * INIT and INIT-ACK only gets the init ack "header" portion 4538 * only because we don't have to process the peer's COOKIE. 4539 * All others get a complete chunk. 4540 */ 4541 switch (ch->chunk_type) { 4542 case SCTP_INITIATION: 4543 contiguous = sizeof(struct sctp_init_chunk); 4544 break; 4545 case SCTP_INITIATION_ACK: 4546 contiguous = sizeof(struct sctp_init_ack_chunk); 4547 break; 4548 default: 4549 contiguous = min(chk_length, sizeof(chunk_buf)); 4550 break; 4551 } 4552 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4553 contiguous, 4554 chunk_buf); 4555 if (ch == NULL) { 4556 *offset = length; 4557 return (stcb); 4558 } 4559 4560 num_chunks++; 4561 /* Save off the last place we got a control from */ 4562 if (stcb != NULL) { 4563 if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) { 4564 /* 4565 * allow last_control to be NULL if 4566 * ASCONF... ASCONF processing will find the 4567 * right net later 4568 */ 4569 if ((netp != NULL) && (*netp != NULL)) 4570 stcb->asoc.last_control_chunk_from = *netp; 4571 } 4572 } 4573 #ifdef SCTP_AUDITING_ENABLED 4574 sctp_audit_log(0xB0, ch->chunk_type); 4575 #endif 4576 4577 /* check to see if this chunk required auth, but isn't */ 4578 if ((stcb != NULL) && 4579 sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) && 4580 !stcb->asoc.authenticated) { 4581 /* "silently" ignore */ 4582 SCTP_STAT_INCR(sctps_recvauthmissing); 4583 goto next_chunk; 4584 } 4585 switch (ch->chunk_type) { 4586 case SCTP_INITIATION: 4587 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n"); 4588 /* The INIT chunk must be the only chunk. */ 4589 if ((num_chunks > 1) || 4590 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4591 /* 4592 * RFC 4960bis requires stopping the 4593 * processing of the packet. 4594 */ 4595 *offset = length; 4596 return (stcb); 4597 } 4598 /* Honor our resource limit. */ 4599 if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) { 4600 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 4601 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err, 4602 mflowtype, mflowid, inp->fibnum, 4603 vrf_id, port); 4604 *offset = length; 4605 if (stcb != NULL) { 4606 SCTP_TCB_UNLOCK(stcb); 4607 } 4608 return (NULL); 4609 } 4610 sctp_handle_init(m, iphlen, *offset, src, dst, sh, 4611 (struct sctp_init_chunk *)ch, inp, 4612 stcb, *netp, 4613 mflowtype, mflowid, 4614 vrf_id, port); 4615 *offset = length; 4616 if (stcb != NULL) { 4617 SCTP_TCB_UNLOCK(stcb); 4618 } 4619 return (NULL); 4620 break; 4621 case SCTP_PAD_CHUNK: 4622 break; 4623 case SCTP_INITIATION_ACK: 4624 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT_ACK\n"); 4625 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4626 /* We are not interested anymore */ 4627 if ((stcb != NULL) && (stcb->asoc.total_output_queue_size)) { 4628 ; 4629 } else { 4630 *offset = length; 4631 if (stcb != NULL) { 4632 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 4633 SCTP_FROM_SCTP_INPUT + SCTP_LOC_29); 4634 } 4635 return (NULL); 4636 } 4637 } 4638 /* The INIT-ACK chunk must be the only chunk. */ 4639 if ((num_chunks > 1) || 4640 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4641 *offset = length; 4642 return (stcb); 4643 } 4644 if ((netp != NULL) && (*netp != NULL)) { 4645 ret = sctp_handle_init_ack(m, iphlen, *offset, 4646 src, dst, sh, 4647 (struct sctp_init_ack_chunk *)ch, 4648 stcb, *netp, 4649 &abort_no_unlock, 4650 mflowtype, mflowid, 4651 vrf_id); 4652 } else { 4653 ret = -1; 4654 } 4655 *offset = length; 4656 if (abort_no_unlock) { 4657 return (NULL); 4658 } 4659 /* 4660 * Special case, I must call the output routine to 4661 * get the cookie echoed 4662 */ 4663 if ((stcb != NULL) && (ret == 0)) { 4664 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 4665 } 4666 return (stcb); 4667 break; 4668 case SCTP_SELECTIVE_ACK: 4669 case SCTP_NR_SELECTIVE_ACK: 4670 { 4671 int abort_now = 0; 4672 uint32_t a_rwnd, cum_ack; 4673 uint16_t num_seg, num_nr_seg, num_dup; 4674 uint8_t flags; 4675 int offset_seg, offset_dup; 4676 4677 SCTPDBG(SCTP_DEBUG_INPUT3, "%s\n", 4678 ch->chunk_type == SCTP_SELECTIVE_ACK ? "SCTP_SACK" : "SCTP_NR_SACK"); 4679 SCTP_STAT_INCR(sctps_recvsacks); 4680 if (stcb == NULL) { 4681 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing %s chunk\n", 4682 (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK"); 4683 break; 4684 } 4685 if (ch->chunk_type == SCTP_SELECTIVE_ACK) { 4686 if (chk_length < sizeof(struct sctp_sack_chunk)) { 4687 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n"); 4688 break; 4689 } 4690 } else { 4691 if (stcb->asoc.nrsack_supported == 0) { 4692 goto unknown_chunk; 4693 } 4694 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) { 4695 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR_SACK chunk, too small\n"); 4696 break; 4697 } 4698 } 4699 if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4700 /*- 4701 * If we have sent a shutdown-ack, we will pay no 4702 * attention to a sack sent in to us since 4703 * we don't care anymore. 4704 */ 4705 break; 4706 } 4707 flags = ch->chunk_flags; 4708 if (ch->chunk_type == SCTP_SELECTIVE_ACK) { 4709 struct sctp_sack_chunk *sack; 4710 4711 sack = (struct sctp_sack_chunk *)ch; 4712 cum_ack = ntohl(sack->sack.cum_tsn_ack); 4713 num_seg = ntohs(sack->sack.num_gap_ack_blks); 4714 num_nr_seg = 0; 4715 num_dup = ntohs(sack->sack.num_dup_tsns); 4716 a_rwnd = ntohl(sack->sack.a_rwnd); 4717 if (sizeof(struct sctp_sack_chunk) + 4718 num_seg * sizeof(struct sctp_gap_ack_block) + 4719 num_dup * sizeof(uint32_t) != chk_length) { 4720 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n"); 4721 break; 4722 } 4723 offset_seg = *offset + sizeof(struct sctp_sack_chunk); 4724 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 4725 } else { 4726 struct sctp_nr_sack_chunk *nr_sack; 4727 4728 nr_sack = (struct sctp_nr_sack_chunk *)ch; 4729 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack); 4730 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks); 4731 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks); 4732 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns); 4733 a_rwnd = ntohl(nr_sack->nr_sack.a_rwnd); 4734 if (sizeof(struct sctp_nr_sack_chunk) + 4735 (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) + 4736 num_dup * sizeof(uint32_t) != chk_length) { 4737 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n"); 4738 break; 4739 } 4740 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk); 4741 offset_dup = offset_seg + (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block); 4742 } 4743 SCTPDBG(SCTP_DEBUG_INPUT3, "%s process cum_ack:%x num_seg:%d a_rwnd:%d\n", 4744 (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK", 4745 cum_ack, num_seg, a_rwnd); 4746 stcb->asoc.seen_a_sack_this_pkt = 1; 4747 if ((stcb->asoc.pr_sctp_cnt == 0) && 4748 (num_seg == 0) && (num_nr_seg == 0) && 4749 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 4750 (stcb->asoc.saw_sack_with_frags == 0) && 4751 (stcb->asoc.saw_sack_with_nr_frags == 0) && 4752 (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) { 4753 /* 4754 * We have a SIMPLE sack having no 4755 * prior segments and data on sent 4756 * queue to be acked. Use the faster 4757 * path sack processing. We also 4758 * allow window update sacks with no 4759 * missing segments to go this way 4760 * too. 4761 */ 4762 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, 4763 &abort_now, ecne_seen); 4764 } else { 4765 if ((netp != NULL) && (*netp != NULL)) { 4766 sctp_handle_sack(m, offset_seg, offset_dup, stcb, 4767 num_seg, num_nr_seg, num_dup, &abort_now, flags, 4768 cum_ack, a_rwnd, ecne_seen); 4769 } 4770 } 4771 if (abort_now) { 4772 /* ABORT signal from sack processing */ 4773 *offset = length; 4774 return (NULL); 4775 } 4776 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 4777 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 4778 (stcb->asoc.stream_queue_cnt == 0)) { 4779 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 4780 } 4781 break; 4782 } 4783 case SCTP_HEARTBEAT_REQUEST: 4784 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n"); 4785 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 4786 SCTP_STAT_INCR(sctps_recvheartbeat); 4787 sctp_send_heartbeat_ack(stcb, m, *offset, 4788 chk_length, *netp); 4789 } 4790 break; 4791 case SCTP_HEARTBEAT_ACK: 4792 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT_ACK\n"); 4793 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) { 4794 /* Its not ours */ 4795 break; 4796 } 4797 SCTP_STAT_INCR(sctps_recvheartbeatack); 4798 if ((netp != NULL) && (*netp != NULL)) { 4799 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch, 4800 stcb, *netp); 4801 } 4802 break; 4803 case SCTP_ABORT_ASSOCIATION: 4804 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n", 4805 (void *)stcb); 4806 *offset = length; 4807 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 4808 if (sctp_handle_abort((struct sctp_abort_chunk *)ch, stcb, *netp)) { 4809 return (NULL); 4810 } else { 4811 return (stcb); 4812 } 4813 } else { 4814 return (NULL); 4815 } 4816 break; 4817 case SCTP_SHUTDOWN: 4818 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n", 4819 (void *)stcb); 4820 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) { 4821 break; 4822 } 4823 if ((netp != NULL) && (*netp != NULL)) { 4824 abort_flag = 0; 4825 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch, 4826 stcb, *netp, &abort_flag); 4827 if (abort_flag) { 4828 *offset = length; 4829 return (NULL); 4830 } 4831 } 4832 break; 4833 case SCTP_SHUTDOWN_ACK: 4834 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_ACK, stcb %p\n", (void *)stcb); 4835 if ((chk_length == sizeof(struct sctp_shutdown_ack_chunk)) && 4836 (stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 4837 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp); 4838 *offset = length; 4839 return (NULL); 4840 } 4841 break; 4842 case SCTP_OPERATION_ERROR: 4843 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP_ERR\n"); 4844 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL) && 4845 sctp_handle_error(ch, stcb, *netp, contiguous) < 0) { 4846 *offset = length; 4847 return (NULL); 4848 } 4849 break; 4850 case SCTP_COOKIE_ECHO: 4851 SCTPDBG(SCTP_DEBUG_INPUT3, 4852 "SCTP_COOKIE_ECHO, stcb %p\n", (void *)stcb); 4853 if ((stcb != NULL) && (stcb->asoc.total_output_queue_size > 0)) { 4854 ; 4855 } else { 4856 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4857 /* We are not interested anymore */ 4858 abend: 4859 if (stcb != NULL) { 4860 SCTP_TCB_UNLOCK(stcb); 4861 } 4862 *offset = length; 4863 return (NULL); 4864 } 4865 } 4866 /*- 4867 * First are we accepting? We do this again here 4868 * since it is possible that a previous endpoint WAS 4869 * listening responded to a INIT-ACK and then 4870 * closed. We opened and bound.. and are now no 4871 * longer listening. 4872 * 4873 * XXXGL: notes on checking listen queue length. 4874 * 1) SCTP_IS_LISTENING() doesn't necessarily mean 4875 * SOLISTENING(), because a listening "UDP type" 4876 * socket isn't listening in terms of the socket 4877 * layer. It is a normal data flow socket, that 4878 * can fork off new connections. Thus, we should 4879 * look into sol_qlen only in case we are !UDP. 4880 * 2) Checking sol_qlen in general requires locking 4881 * the socket, and this code lacks that. 4882 */ 4883 if ((stcb == NULL) && 4884 (!SCTP_IS_LISTENING(inp) || 4885 (!(inp->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE) && 4886 inp->sctp_socket->sol_qlen >= inp->sctp_socket->sol_qlimit))) { 4887 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 4888 (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) { 4889 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 4890 sctp_abort_association(inp, stcb, m, iphlen, 4891 src, dst, sh, op_err, 4892 mflowtype, mflowid, 4893 vrf_id, port); 4894 } 4895 *offset = length; 4896 return (NULL); 4897 } else { 4898 struct mbuf *ret_buf; 4899 struct sctp_inpcb *linp; 4900 struct sctp_tmit_chunk *chk; 4901 4902 if (inp->sctp_flags & (SCTP_PCB_FLAGS_SOCKET_GONE | 4903 SCTP_PCB_FLAGS_SOCKET_ALLGONE)) { 4904 goto abend; 4905 } 4906 4907 if (stcb) { 4908 linp = NULL; 4909 } else { 4910 linp = inp; 4911 } 4912 4913 if (linp != NULL) { 4914 SCTP_ASOC_CREATE_LOCK(linp); 4915 } 4916 4917 if (netp != NULL) { 4918 struct sctp_tcb *locked_stcb; 4919 4920 locked_stcb = stcb; 4921 ret_buf = 4922 sctp_handle_cookie_echo(m, iphlen, 4923 *offset, 4924 src, dst, 4925 sh, 4926 (struct sctp_cookie_echo_chunk *)ch, 4927 &inp, &stcb, netp, 4928 auth_skipped, 4929 auth_offset, 4930 auth_len, 4931 &locked_stcb, 4932 mflowtype, 4933 mflowid, 4934 vrf_id, 4935 port); 4936 if ((locked_stcb != NULL) && (locked_stcb != stcb)) { 4937 SCTP_TCB_UNLOCK(locked_stcb); 4938 } 4939 if (stcb != NULL) { 4940 SCTP_TCB_LOCK_ASSERT(stcb); 4941 } 4942 } else { 4943 ret_buf = NULL; 4944 } 4945 if (linp != NULL) { 4946 SCTP_ASOC_CREATE_UNLOCK(linp); 4947 } 4948 if (ret_buf == NULL) { 4949 if (stcb != NULL) { 4950 SCTP_TCB_UNLOCK(stcb); 4951 } 4952 SCTPDBG(SCTP_DEBUG_INPUT3, 4953 "GAK, null buffer\n"); 4954 *offset = length; 4955 return (NULL); 4956 } 4957 /* if AUTH skipped, see if it verified... */ 4958 if (auth_skipped) { 4959 got_auth = 1; 4960 auth_skipped = 0; 4961 } 4962 /* Restart the timer if we have pending data */ 4963 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 4964 if (chk->whoTo != NULL) { 4965 break; 4966 } 4967 } 4968 if (chk != NULL) { 4969 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 4970 } 4971 } 4972 break; 4973 case SCTP_COOKIE_ACK: 4974 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE_ACK, stcb %p\n", (void *)stcb); 4975 if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) { 4976 break; 4977 } 4978 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4979 /* We are not interested anymore */ 4980 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4981 ; 4982 } else if (stcb) { 4983 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 4984 SCTP_FROM_SCTP_INPUT + SCTP_LOC_30); 4985 *offset = length; 4986 return (NULL); 4987 } 4988 } 4989 if ((netp != NULL) && (*netp != NULL)) { 4990 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp); 4991 } 4992 break; 4993 case SCTP_ECN_ECHO: 4994 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_ECHO\n"); 4995 if (stcb == NULL) { 4996 break; 4997 } 4998 if (stcb->asoc.ecn_supported == 0) { 4999 goto unknown_chunk; 5000 } 5001 if ((chk_length != sizeof(struct sctp_ecne_chunk)) && 5002 (chk_length != sizeof(struct old_sctp_ecne_chunk))) { 5003 break; 5004 } 5005 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, stcb); 5006 ecne_seen = 1; 5007 break; 5008 case SCTP_ECN_CWR: 5009 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_CWR\n"); 5010 if (stcb == NULL) { 5011 break; 5012 } 5013 if (stcb->asoc.ecn_supported == 0) { 5014 goto unknown_chunk; 5015 } 5016 if (chk_length != sizeof(struct sctp_cwr_chunk)) { 5017 break; 5018 } 5019 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp); 5020 break; 5021 case SCTP_SHUTDOWN_COMPLETE: 5022 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_COMPLETE, stcb %p\n", (void *)stcb); 5023 /* must be first and only chunk */ 5024 if ((num_chunks > 1) || 5025 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 5026 *offset = length; 5027 return (stcb); 5028 } 5029 if ((chk_length == sizeof(struct sctp_shutdown_complete_chunk)) && 5030 (stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 5031 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch, 5032 stcb, *netp); 5033 *offset = length; 5034 return (NULL); 5035 } 5036 break; 5037 case SCTP_ASCONF: 5038 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n"); 5039 if (stcb != NULL) { 5040 if (stcb->asoc.asconf_supported == 0) { 5041 goto unknown_chunk; 5042 } 5043 sctp_handle_asconf(m, *offset, src, 5044 (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0); 5045 asconf_cnt++; 5046 } 5047 break; 5048 case SCTP_ASCONF_ACK: 5049 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF_ACK\n"); 5050 if (stcb == NULL) { 5051 break; 5052 } 5053 if (stcb->asoc.asconf_supported == 0) { 5054 goto unknown_chunk; 5055 } 5056 if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) { 5057 break; 5058 } 5059 if ((netp != NULL) && (*netp != NULL)) { 5060 /* He's alive so give him credit */ 5061 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5062 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5063 stcb->asoc.overall_error_count, 5064 0, 5065 SCTP_FROM_SCTP_INPUT, 5066 __LINE__); 5067 } 5068 stcb->asoc.overall_error_count = 0; 5069 sctp_handle_asconf_ack(m, *offset, 5070 (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock); 5071 if (abort_no_unlock) 5072 return (NULL); 5073 } 5074 break; 5075 case SCTP_FORWARD_CUM_TSN: 5076 case SCTP_IFORWARD_CUM_TSN: 5077 SCTPDBG(SCTP_DEBUG_INPUT3, "%s\n", 5078 ch->chunk_type == SCTP_FORWARD_CUM_TSN ? "FORWARD_TSN" : "I_FORWARD_TSN"); 5079 if (stcb == NULL) { 5080 break; 5081 } 5082 if (stcb->asoc.prsctp_supported == 0) { 5083 goto unknown_chunk; 5084 } 5085 if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) { 5086 break; 5087 } 5088 if (((stcb->asoc.idata_supported == 1) && (ch->chunk_type == SCTP_FORWARD_CUM_TSN)) || 5089 ((stcb->asoc.idata_supported == 0) && (ch->chunk_type == SCTP_IFORWARD_CUM_TSN))) { 5090 if (ch->chunk_type == SCTP_FORWARD_CUM_TSN) { 5091 SCTP_SNPRINTF(msg, sizeof(msg), "%s", "FORWARD-TSN chunk received when I-FORWARD-TSN was negotiated"); 5092 } else { 5093 SCTP_SNPRINTF(msg, sizeof(msg), "%s", "I-FORWARD-TSN chunk received when FORWARD-TSN was negotiated"); 5094 } 5095 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); 5096 sctp_abort_an_association(inp, stcb, op_err, false, SCTP_SO_NOT_LOCKED); 5097 *offset = length; 5098 return (NULL); 5099 } 5100 *fwd_tsn_seen = 1; 5101 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5102 /* We are not interested anymore */ 5103 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 5104 SCTP_FROM_SCTP_INPUT + SCTP_LOC_31); 5105 *offset = length; 5106 return (NULL); 5107 } 5108 /* 5109 * For sending a SACK this looks like DATA chunks. 5110 */ 5111 stcb->asoc.last_data_chunk_from = stcb->asoc.last_control_chunk_from; 5112 abort_flag = 0; 5113 sctp_handle_forward_tsn(stcb, 5114 (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset); 5115 if (abort_flag) { 5116 *offset = length; 5117 return (NULL); 5118 } 5119 break; 5120 case SCTP_STREAM_RESET: 5121 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n"); 5122 if (stcb == NULL) { 5123 break; 5124 } 5125 if (stcb->asoc.reconfig_supported == 0) { 5126 goto unknown_chunk; 5127 } 5128 if (chk_length < sizeof(struct sctp_stream_reset_tsn_req)) { 5129 break; 5130 } 5131 if (sctp_handle_stream_reset(stcb, m, *offset, ch)) { 5132 /* stop processing */ 5133 *offset = length; 5134 return (NULL); 5135 } 5136 break; 5137 case SCTP_PACKET_DROPPED: 5138 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n"); 5139 if (stcb == NULL) { 5140 break; 5141 } 5142 if (stcb->asoc.pktdrop_supported == 0) { 5143 goto unknown_chunk; 5144 } 5145 if (chk_length < sizeof(struct sctp_pktdrop_chunk)) { 5146 break; 5147 } 5148 if ((netp != NULL) && (*netp != NULL)) { 5149 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch, 5150 stcb, *netp, 5151 min(chk_length, contiguous)); 5152 } 5153 break; 5154 case SCTP_AUTHENTICATION: 5155 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n"); 5156 if (stcb == NULL) { 5157 /* save the first AUTH for later processing */ 5158 if (auth_skipped == 0) { 5159 auth_offset = *offset; 5160 auth_len = chk_length; 5161 auth_skipped = 1; 5162 } 5163 /* skip this chunk (temporarily) */ 5164 break; 5165 } 5166 if (stcb->asoc.auth_supported == 0) { 5167 goto unknown_chunk; 5168 } 5169 if ((chk_length < (sizeof(struct sctp_auth_chunk))) || 5170 (chk_length > (sizeof(struct sctp_auth_chunk) + 5171 SCTP_AUTH_DIGEST_LEN_MAX))) { 5172 /* Its not ours */ 5173 *offset = length; 5174 return (stcb); 5175 } 5176 if (got_auth == 1) { 5177 /* skip this chunk... it's already auth'd */ 5178 break; 5179 } 5180 got_auth = 1; 5181 if (sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch, m, *offset)) { 5182 /* auth HMAC failed so dump the packet */ 5183 *offset = length; 5184 return (stcb); 5185 } else { 5186 /* remaining chunks are HMAC checked */ 5187 stcb->asoc.authenticated = 1; 5188 } 5189 break; 5190 5191 default: 5192 unknown_chunk: 5193 /* it's an unknown chunk! */ 5194 if ((ch->chunk_type & 0x40) && 5195 (stcb != NULL) && 5196 (SCTP_GET_STATE(stcb) != SCTP_STATE_EMPTY) && 5197 (SCTP_GET_STATE(stcb) != SCTP_STATE_INUSE) && 5198 (SCTP_GET_STATE(stcb) != SCTP_STATE_COOKIE_WAIT)) { 5199 struct sctp_gen_error_cause *cause; 5200 int len; 5201 5202 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_gen_error_cause), 5203 0, M_NOWAIT, 1, MT_DATA); 5204 if (op_err != NULL) { 5205 len = min(SCTP_SIZE32(chk_length), (uint32_t)(length - *offset)); 5206 cause = mtod(op_err, struct sctp_gen_error_cause *); 5207 cause->code = htons(SCTP_CAUSE_UNRECOG_CHUNK); 5208 cause->length = htons((uint16_t)(len + sizeof(struct sctp_gen_error_cause))); 5209 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_gen_error_cause); 5210 SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(m, *offset, len, M_NOWAIT); 5211 if (SCTP_BUF_NEXT(op_err) != NULL) { 5212 #ifdef SCTP_MBUF_LOGGING 5213 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5214 sctp_log_mbc(SCTP_BUF_NEXT(op_err), SCTP_MBUF_ICOPY); 5215 } 5216 #endif 5217 sctp_queue_op_err(stcb, op_err); 5218 } else { 5219 sctp_m_freem(op_err); 5220 } 5221 } 5222 } 5223 if ((ch->chunk_type & 0x80) == 0) { 5224 /* discard this packet */ 5225 *offset = length; 5226 return (stcb); 5227 } /* else skip this bad chunk and continue... */ 5228 break; 5229 } /* switch (ch->chunk_type) */ 5230 5231 next_chunk: 5232 /* get the next chunk */ 5233 *offset += SCTP_SIZE32(chk_length); 5234 if (*offset >= length) { 5235 /* no more data left in the mbuf chain */ 5236 break; 5237 } 5238 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 5239 sizeof(struct sctp_chunkhdr), chunk_buf); 5240 if (ch == NULL) { 5241 *offset = length; 5242 return (stcb); 5243 } 5244 } /* while */ 5245 5246 if ((asconf_cnt > 0) && (stcb != NULL)) { 5247 sctp_send_asconf_ack(stcb); 5248 } 5249 return (stcb); 5250 } 5251 5252 /* 5253 * common input chunk processing (v4 and v6) 5254 */ 5255 void 5256 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length, 5257 struct sockaddr *src, struct sockaddr *dst, 5258 struct sctphdr *sh, struct sctp_chunkhdr *ch, 5259 uint8_t compute_crc, 5260 uint8_t ecn_bits, 5261 uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum, 5262 uint32_t vrf_id, uint16_t port) 5263 { 5264 uint32_t high_tsn; 5265 int fwd_tsn_seen = 0, data_processed = 0; 5266 struct mbuf *m = *mm, *op_err; 5267 char msg[SCTP_DIAG_INFO_LEN]; 5268 int un_sent; 5269 int cnt_ctrl_ready = 0; 5270 struct sctp_inpcb *inp = NULL, *inp_decr = NULL; 5271 struct sctp_tcb *stcb = NULL; 5272 struct sctp_nets *net = NULL; 5273 5274 SCTP_STAT_INCR(sctps_recvdatagrams); 5275 #ifdef SCTP_AUDITING_ENABLED 5276 sctp_audit_log(0xE0, 1); 5277 sctp_auditing(0, inp, stcb, net); 5278 #endif 5279 if (compute_crc != 0) { 5280 uint32_t check, calc_check; 5281 5282 check = sh->checksum; 5283 sh->checksum = 0; 5284 calc_check = sctp_calculate_cksum(m, iphlen); 5285 sh->checksum = check; 5286 if (calc_check != check) { 5287 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x m:%p mlen:%d iphlen:%d\n", 5288 calc_check, check, (void *)m, length, iphlen); 5289 stcb = sctp_findassociation_addr(m, offset, src, dst, 5290 sh, ch, &inp, &net, vrf_id); 5291 #if defined(INET) || defined(INET6) 5292 if ((ch->chunk_type != SCTP_INITIATION) && 5293 (net != NULL) && (net->port != port)) { 5294 if (net->port == 0) { 5295 /* UDP encapsulation turned on. */ 5296 net->mtu -= sizeof(struct udphdr); 5297 if (stcb->asoc.smallest_mtu > net->mtu) { 5298 sctp_pathmtu_adjustment(stcb, net->mtu, true); 5299 } 5300 } else if (port == 0) { 5301 /* UDP encapsulation turned off. */ 5302 net->mtu += sizeof(struct udphdr); 5303 /* XXX Update smallest_mtu */ 5304 } 5305 net->port = port; 5306 } 5307 #endif 5308 if (net != NULL) { 5309 net->flowtype = mflowtype; 5310 net->flowid = mflowid; 5311 } 5312 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5313 if ((inp != NULL) && (stcb != NULL)) { 5314 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1); 5315 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED); 5316 } else if ((inp != NULL) && (stcb == NULL)) { 5317 inp_decr = inp; 5318 } 5319 SCTP_STAT_INCR(sctps_badsum); 5320 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors); 5321 goto out; 5322 } 5323 } 5324 /* Destination port of 0 is illegal, based on RFC4960. */ 5325 if (sh->dest_port == 0) { 5326 SCTP_STAT_INCR(sctps_hdrops); 5327 goto out; 5328 } 5329 stcb = sctp_findassociation_addr(m, offset, src, dst, 5330 sh, ch, &inp, &net, vrf_id); 5331 #if defined(INET) || defined(INET6) 5332 if ((ch->chunk_type != SCTP_INITIATION) && 5333 (net != NULL) && (net->port != port)) { 5334 if (net->port == 0) { 5335 /* UDP encapsulation turned on. */ 5336 net->mtu -= sizeof(struct udphdr); 5337 if (stcb->asoc.smallest_mtu > net->mtu) { 5338 sctp_pathmtu_adjustment(stcb, net->mtu, true); 5339 } 5340 } else if (port == 0) { 5341 /* UDP encapsulation turned off. */ 5342 net->mtu += sizeof(struct udphdr); 5343 /* XXX Update smallest_mtu */ 5344 } 5345 net->port = port; 5346 } 5347 #endif 5348 if (net != NULL) { 5349 net->flowtype = mflowtype; 5350 net->flowid = mflowid; 5351 } 5352 if (inp == NULL) { 5353 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5354 SCTP_STAT_INCR(sctps_noport); 5355 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) { 5356 goto out; 5357 } 5358 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 5359 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks); 5360 sctp_send_shutdown_complete2(src, dst, sh, 5361 mflowtype, mflowid, fibnum, 5362 vrf_id, port); 5363 goto out; 5364 } 5365 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) { 5366 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks); 5367 goto out; 5368 } 5369 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) { 5370 if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) || 5371 ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) && 5372 (ch->chunk_type != SCTP_INIT))) { 5373 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5374 "Out of the blue"); 5375 sctp_send_abort(m, iphlen, src, dst, 5376 sh, 0, op_err, 5377 mflowtype, mflowid, fibnum, 5378 vrf_id, port); 5379 } 5380 } 5381 goto out; 5382 } else if (stcb == NULL) { 5383 inp_decr = inp; 5384 } 5385 SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n", 5386 (void *)m, iphlen, offset, length, (void *)stcb); 5387 if (stcb) { 5388 /* always clear this before beginning a packet */ 5389 stcb->asoc.authenticated = 0; 5390 stcb->asoc.seen_a_sack_this_pkt = 0; 5391 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n", 5392 (void *)stcb, stcb->asoc.state); 5393 5394 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) || 5395 (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) { 5396 /*- 5397 * If we hit here, we had a ref count 5398 * up when the assoc was aborted and the 5399 * timer is clearing out the assoc, we should 5400 * NOT respond to any packet.. its OOTB. 5401 */ 5402 SCTP_TCB_UNLOCK(stcb); 5403 stcb = NULL; 5404 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5405 SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5406 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5407 msg); 5408 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5409 mflowtype, mflowid, inp->fibnum, 5410 vrf_id, port); 5411 goto out; 5412 } 5413 } 5414 if (IS_SCTP_CONTROL(ch)) { 5415 /* process the control portion of the SCTP packet */ 5416 /* sa_ignore NO_NULL_CHK */ 5417 stcb = sctp_process_control(m, iphlen, &offset, length, 5418 src, dst, sh, ch, 5419 inp, stcb, &net, &fwd_tsn_seen, 5420 mflowtype, mflowid, fibnum, 5421 vrf_id, port); 5422 if (stcb) { 5423 /* 5424 * This covers us if the cookie-echo was there and 5425 * it changes our INP. 5426 */ 5427 inp = stcb->sctp_ep; 5428 #if defined(INET) || defined(INET6) 5429 if ((ch->chunk_type != SCTP_INITIATION) && 5430 (net != NULL) && (net->port != port)) { 5431 if (net->port == 0) { 5432 /* UDP encapsulation turned on. */ 5433 net->mtu -= sizeof(struct udphdr); 5434 if (stcb->asoc.smallest_mtu > net->mtu) { 5435 sctp_pathmtu_adjustment(stcb, net->mtu, true); 5436 } 5437 } else if (port == 0) { 5438 /* UDP encapsulation turned off. */ 5439 net->mtu += sizeof(struct udphdr); 5440 /* XXX Update smallest_mtu */ 5441 } 5442 net->port = port; 5443 } 5444 #endif 5445 } 5446 } else { 5447 /* 5448 * no control chunks, so pre-process DATA chunks (these 5449 * checks are taken care of by control processing) 5450 */ 5451 5452 /* 5453 * if DATA only packet, and auth is required, then punt... 5454 * can't have authenticated without any AUTH (control) 5455 * chunks 5456 */ 5457 if ((stcb != NULL) && 5458 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) { 5459 /* "silently" ignore */ 5460 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5461 SCTP_STAT_INCR(sctps_recvauthmissing); 5462 goto out; 5463 } 5464 if (stcb == NULL) { 5465 /* out of the blue DATA chunk */ 5466 SCTP_PROBE5(receive, NULL, NULL, m, NULL, sh); 5467 SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5468 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5469 msg); 5470 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5471 mflowtype, mflowid, fibnum, 5472 vrf_id, port); 5473 goto out; 5474 } 5475 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) { 5476 /* v_tag mismatch! */ 5477 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5478 SCTP_STAT_INCR(sctps_badvtag); 5479 goto out; 5480 } 5481 } 5482 5483 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5484 if (stcb == NULL) { 5485 /* 5486 * no valid TCB for this packet, or we found it's a bad 5487 * packet while processing control, or we're done with this 5488 * packet (done or skip rest of data), so we drop it... 5489 */ 5490 goto out; 5491 } 5492 5493 /* 5494 * DATA chunk processing 5495 */ 5496 /* plow through the data chunks while length > offset */ 5497 5498 /* 5499 * Rest should be DATA only. Check authentication state if AUTH for 5500 * DATA is required. 5501 */ 5502 if ((length > offset) && 5503 (stcb != NULL) && 5504 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) && 5505 !stcb->asoc.authenticated) { 5506 /* "silently" ignore */ 5507 SCTP_STAT_INCR(sctps_recvauthmissing); 5508 SCTPDBG(SCTP_DEBUG_AUTH1, 5509 "Data chunk requires AUTH, skipped\n"); 5510 goto trigger_send; 5511 } 5512 if (length > offset) { 5513 int retval; 5514 5515 /* 5516 * First check to make sure our state is correct. We would 5517 * not get here unless we really did have a tag, so we don't 5518 * abort if this happens, just dump the chunk silently. 5519 */ 5520 switch (SCTP_GET_STATE(stcb)) { 5521 case SCTP_STATE_COOKIE_ECHOED: 5522 /* 5523 * we consider data with valid tags in this state 5524 * shows us the cookie-ack was lost. Imply it was 5525 * there. 5526 */ 5527 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net); 5528 break; 5529 case SCTP_STATE_COOKIE_WAIT: 5530 /* 5531 * We consider OOTB any data sent during asoc setup. 5532 */ 5533 SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5534 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5535 msg); 5536 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5537 mflowtype, mflowid, inp->fibnum, 5538 vrf_id, port); 5539 goto out; 5540 /* sa_ignore NOTREACHED */ 5541 break; 5542 case SCTP_STATE_EMPTY: /* should not happen */ 5543 case SCTP_STATE_INUSE: /* should not happen */ 5544 case SCTP_STATE_SHUTDOWN_RECEIVED: /* This is a peer error */ 5545 case SCTP_STATE_SHUTDOWN_ACK_SENT: 5546 default: 5547 goto out; 5548 /* sa_ignore NOTREACHED */ 5549 break; 5550 case SCTP_STATE_OPEN: 5551 case SCTP_STATE_SHUTDOWN_SENT: 5552 break; 5553 } 5554 /* plow through the data chunks while length > offset */ 5555 retval = sctp_process_data(mm, iphlen, &offset, length, 5556 inp, stcb, net, &high_tsn); 5557 if (retval == 2) { 5558 /* 5559 * The association aborted, NO UNLOCK needed since 5560 * the association is destroyed. 5561 */ 5562 stcb = NULL; 5563 goto out; 5564 } 5565 if (retval == 0) { 5566 data_processed = 1; 5567 } 5568 /* 5569 * Anything important needs to have been m_copy'ed in 5570 * process_data 5571 */ 5572 } 5573 5574 /* take care of ecn */ 5575 if ((data_processed == 1) && 5576 (stcb->asoc.ecn_supported == 1) && 5577 ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) { 5578 /* Yep, we need to add a ECNE */ 5579 sctp_send_ecn_echo(stcb, net, high_tsn); 5580 } 5581 5582 if ((data_processed == 0) && (fwd_tsn_seen)) { 5583 int was_a_gap; 5584 uint32_t highest_tsn; 5585 5586 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) { 5587 highest_tsn = stcb->asoc.highest_tsn_inside_nr_map; 5588 } else { 5589 highest_tsn = stcb->asoc.highest_tsn_inside_map; 5590 } 5591 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn); 5592 stcb->asoc.send_sack = 1; 5593 sctp_sack_check(stcb, was_a_gap); 5594 } else if (fwd_tsn_seen) { 5595 stcb->asoc.send_sack = 1; 5596 } 5597 /* trigger send of any chunks in queue... */ 5598 trigger_send: 5599 #ifdef SCTP_AUDITING_ENABLED 5600 sctp_audit_log(0xE0, 2); 5601 sctp_auditing(1, inp, stcb, net); 5602 #endif 5603 SCTPDBG(SCTP_DEBUG_INPUT1, 5604 "Check for chunk output prw:%d tqe:%d tf=%d\n", 5605 stcb->asoc.peers_rwnd, 5606 TAILQ_EMPTY(&stcb->asoc.control_send_queue), 5607 stcb->asoc.total_flight); 5608 un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight); 5609 if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 5610 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq; 5611 } 5612 if (!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue) || 5613 cnt_ctrl_ready || 5614 stcb->asoc.trigger_reset || 5615 ((un_sent > 0) && 5616 (stcb->asoc.peers_rwnd > 0 || stcb->asoc.total_flight == 0))) { 5617 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n"); 5618 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 5619 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n"); 5620 } 5621 #ifdef SCTP_AUDITING_ENABLED 5622 sctp_audit_log(0xE0, 3); 5623 sctp_auditing(2, inp, stcb, net); 5624 #endif 5625 out: 5626 if (stcb != NULL) { 5627 SCTP_TCB_UNLOCK(stcb); 5628 } 5629 if (inp_decr != NULL) { 5630 /* reduce ref-count */ 5631 SCTP_INP_WLOCK(inp_decr); 5632 SCTP_INP_DECR_REF(inp_decr); 5633 SCTP_INP_WUNLOCK(inp_decr); 5634 } 5635 return; 5636 } 5637 5638 #ifdef INET 5639 void 5640 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port) 5641 { 5642 struct mbuf *m; 5643 int iphlen; 5644 uint32_t vrf_id = 0; 5645 uint8_t ecn_bits; 5646 struct sockaddr_in src, dst; 5647 struct ip *ip; 5648 struct sctphdr *sh; 5649 struct sctp_chunkhdr *ch; 5650 int length, offset; 5651 uint8_t compute_crc; 5652 uint32_t mflowid; 5653 uint8_t mflowtype; 5654 uint16_t fibnum; 5655 5656 iphlen = off; 5657 if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) { 5658 SCTP_RELEASE_PKT(i_pak); 5659 return; 5660 } 5661 m = SCTP_HEADER_TO_CHAIN(i_pak); 5662 #ifdef SCTP_MBUF_LOGGING 5663 /* Log in any input mbufs */ 5664 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5665 sctp_log_mbc(m, SCTP_MBUF_INPUT); 5666 } 5667 #endif 5668 #ifdef SCTP_PACKET_LOGGING 5669 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) { 5670 sctp_packet_log(m); 5671 } 5672 #endif 5673 SCTPDBG(SCTP_DEBUG_CRCOFFLOAD, 5674 "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n", 5675 m->m_pkthdr.len, 5676 if_name(m->m_pkthdr.rcvif), 5677 (int)m->m_pkthdr.csum_flags, CSUM_BITS); 5678 mflowid = m->m_pkthdr.flowid; 5679 mflowtype = M_HASHTYPE_GET(m); 5680 fibnum = M_GETFIB(m); 5681 SCTP_STAT_INCR(sctps_recvpackets); 5682 SCTP_STAT_INCR_COUNTER64(sctps_inpackets); 5683 /* Get IP, SCTP, and first chunk header together in the first mbuf. */ 5684 offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr); 5685 if (SCTP_BUF_LEN(m) < offset) { 5686 if ((m = m_pullup(m, offset)) == NULL) { 5687 SCTP_STAT_INCR(sctps_hdrops); 5688 return; 5689 } 5690 } 5691 ip = mtod(m, struct ip *); 5692 sh = (struct sctphdr *)((caddr_t)ip + iphlen); 5693 ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr)); 5694 offset -= sizeof(struct sctp_chunkhdr); 5695 memset(&src, 0, sizeof(struct sockaddr_in)); 5696 src.sin_family = AF_INET; 5697 src.sin_len = sizeof(struct sockaddr_in); 5698 src.sin_port = sh->src_port; 5699 src.sin_addr = ip->ip_src; 5700 memset(&dst, 0, sizeof(struct sockaddr_in)); 5701 dst.sin_family = AF_INET; 5702 dst.sin_len = sizeof(struct sockaddr_in); 5703 dst.sin_port = sh->dest_port; 5704 dst.sin_addr = ip->ip_dst; 5705 length = ntohs(ip->ip_len); 5706 /* Validate mbuf chain length with IP payload length. */ 5707 if (SCTP_HEADER_LEN(m) != length) { 5708 SCTPDBG(SCTP_DEBUG_INPUT1, 5709 "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m)); 5710 SCTP_STAT_INCR(sctps_hdrops); 5711 goto out; 5712 } 5713 /* SCTP does not allow broadcasts or multicasts */ 5714 if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) { 5715 goto out; 5716 } 5717 if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) { 5718 goto out; 5719 } 5720 ecn_bits = ip->ip_tos; 5721 if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) { 5722 SCTP_STAT_INCR(sctps_recvhwcrc); 5723 compute_crc = 0; 5724 } else { 5725 SCTP_STAT_INCR(sctps_recvswcrc); 5726 compute_crc = 1; 5727 } 5728 sctp_common_input_processing(&m, iphlen, offset, length, 5729 (struct sockaddr *)&src, 5730 (struct sockaddr *)&dst, 5731 sh, ch, 5732 compute_crc, 5733 ecn_bits, 5734 mflowtype, mflowid, fibnum, 5735 vrf_id, port); 5736 out: 5737 if (m) { 5738 sctp_m_freem(m); 5739 } 5740 return; 5741 } 5742 5743 #if defined(SCTP_MCORE_INPUT) && defined(SMP) 5744 extern int *sctp_cpuarry; 5745 #endif 5746 5747 int 5748 sctp_input(struct mbuf **mp, int *offp, int proto SCTP_UNUSED) 5749 { 5750 struct mbuf *m; 5751 int off; 5752 5753 m = *mp; 5754 off = *offp; 5755 #if defined(SCTP_MCORE_INPUT) && defined(SMP) 5756 if (mp_ncpus > 1) { 5757 struct ip *ip; 5758 struct sctphdr *sh; 5759 int offset; 5760 int cpu_to_use; 5761 uint32_t flowid, tag; 5762 5763 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) { 5764 flowid = m->m_pkthdr.flowid; 5765 } else { 5766 /* 5767 * No flow id built by lower layers fix it so we 5768 * create one. 5769 */ 5770 offset = off + sizeof(struct sctphdr); 5771 if (SCTP_BUF_LEN(m) < offset) { 5772 if ((m = m_pullup(m, offset)) == NULL) { 5773 SCTP_STAT_INCR(sctps_hdrops); 5774 return (IPPROTO_DONE); 5775 } 5776 } 5777 ip = mtod(m, struct ip *); 5778 sh = (struct sctphdr *)((caddr_t)ip + off); 5779 tag = htonl(sh->v_tag); 5780 flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port); 5781 m->m_pkthdr.flowid = flowid; 5782 M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE_HASH); 5783 } 5784 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus]; 5785 sctp_queue_to_mcore(m, off, cpu_to_use); 5786 return (IPPROTO_DONE); 5787 } 5788 #endif 5789 sctp_input_with_port(m, off, 0); 5790 return (IPPROTO_DONE); 5791 } 5792 #endif 5793