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 normnally 1600 * would have hit case C. This in effect "extends" 1601 * our vtags in this collision case to be 64 bits. 1602 * The same collision could occur aka you get both 1603 * vtag and seq number the same twice in a row.. but 1604 * is much less likely. If it did happen then we 1605 * would proceed through and bring up the assoc.. we 1606 * may 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 popluate 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 ep = &(*inp_p)->sctp_ep; 2330 l_inp = *inp_p; 2331 if (l_stcb) { 2332 SCTP_TCB_UNLOCK(l_stcb); 2333 } 2334 SCTP_INP_RLOCK(l_inp); 2335 if (l_stcb) { 2336 SCTP_TCB_LOCK(l_stcb); 2337 } 2338 /* which cookie is it? */ 2339 if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) && 2340 (ep->current_secret_number != ep->last_secret_number)) { 2341 /* it's the old cookie */ 2342 (void)sctp_hmac_m(SCTP_HMAC, 2343 (uint8_t *)ep->secret_key[(int)ep->last_secret_number], 2344 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2345 } else { 2346 /* it's the current cookie */ 2347 (void)sctp_hmac_m(SCTP_HMAC, 2348 (uint8_t *)ep->secret_key[(int)ep->current_secret_number], 2349 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2350 } 2351 /* get the signature */ 2352 SCTP_INP_RUNLOCK(l_inp); 2353 sig = (uint8_t *)sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *)&tmp_sig); 2354 if (sig == NULL) { 2355 /* couldn't find signature */ 2356 sctp_m_freem(m_sig); 2357 return (NULL); 2358 } 2359 /* compare the received digest with the computed digest */ 2360 if (timingsafe_bcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) { 2361 /* try the old cookie? */ 2362 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) && 2363 (ep->current_secret_number != ep->last_secret_number)) { 2364 /* compute digest with old */ 2365 (void)sctp_hmac_m(SCTP_HMAC, 2366 (uint8_t *)ep->secret_key[(int)ep->last_secret_number], 2367 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2368 /* compare */ 2369 if (timingsafe_bcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0) 2370 cookie_ok = 1; 2371 } 2372 } else { 2373 cookie_ok = 1; 2374 } 2375 2376 /* 2377 * Now before we continue we must reconstruct our mbuf so that 2378 * normal processing of any other chunks will work. 2379 */ 2380 { 2381 struct mbuf *m_at; 2382 2383 m_at = m; 2384 while (SCTP_BUF_NEXT(m_at) != NULL) { 2385 m_at = SCTP_BUF_NEXT(m_at); 2386 } 2387 SCTP_BUF_NEXT(m_at) = m_sig; 2388 } 2389 2390 if (cookie_ok == 0) { 2391 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n"); 2392 SCTPDBG(SCTP_DEBUG_INPUT2, 2393 "offset = %u, cookie_offset = %u, sig_offset = %u\n", 2394 (uint32_t)offset, cookie_offset, sig_offset); 2395 return (NULL); 2396 } 2397 2398 if (sctp_ticks_to_msecs(cookie->cookie_life) > SCTP_MAX_COOKIE_LIFE) { 2399 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: Invalid cookie lifetime\n"); 2400 return (NULL); 2401 } 2402 time_entered.tv_sec = cookie->time_entered.tv_sec; 2403 time_entered.tv_usec = cookie->time_entered.tv_usec; 2404 if ((time_entered.tv_sec < 0) || 2405 (time_entered.tv_usec < 0) || 2406 (time_entered.tv_usec >= 1000000)) { 2407 /* Invalid time stamp. Cookie must have been modified. */ 2408 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: Invalid time stamp\n"); 2409 return (NULL); 2410 } 2411 (void)SCTP_GETTIME_TIMEVAL(&now); 2412 if (timevalcmp(&now, &time_entered, <)) { 2413 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie generated in the future!\n"); 2414 return (NULL); 2415 } 2416 /* 2417 * Check the cookie timestamps to be sure it's not stale. 2418 * cookie_life is in ticks, so we convert to seconds. 2419 */ 2420 time_expires.tv_sec = time_entered.tv_sec + sctp_ticks_to_secs(cookie->cookie_life); 2421 time_expires.tv_usec = time_entered.tv_usec; 2422 if (timevalcmp(&now, &time_expires, >)) { 2423 /* cookie is stale! */ 2424 struct mbuf *op_err; 2425 struct sctp_error_stale_cookie *cause; 2426 struct timeval diff; 2427 uint32_t staleness; 2428 2429 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_error_stale_cookie), 2430 0, M_NOWAIT, 1, MT_DATA); 2431 if (op_err == NULL) { 2432 /* FOOBAR */ 2433 return (NULL); 2434 } 2435 /* Set the len */ 2436 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_error_stale_cookie); 2437 cause = mtod(op_err, struct sctp_error_stale_cookie *); 2438 cause->cause.code = htons(SCTP_CAUSE_STALE_COOKIE); 2439 cause->cause.length = htons(sizeof(struct sctp_error_stale_cookie)); 2440 diff = now; 2441 timevalsub(&diff, &time_expires); 2442 if ((uint32_t)diff.tv_sec > UINT32_MAX / 1000000) { 2443 staleness = UINT32_MAX; 2444 } else { 2445 staleness = (uint32_t)diff.tv_sec * 1000000; 2446 } 2447 if (UINT32_MAX - staleness >= (uint32_t)diff.tv_usec) { 2448 staleness += (uint32_t)diff.tv_usec; 2449 } else { 2450 staleness = UINT32_MAX; 2451 } 2452 cause->stale_time = htonl(staleness); 2453 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 2454 mflowtype, mflowid, l_inp->fibnum, 2455 vrf_id, port); 2456 return (NULL); 2457 } 2458 /* 2459 * Now we must see with the lookup address if we have an existing 2460 * asoc. This will only happen if we were in the COOKIE-WAIT state 2461 * and a INIT collided with us and somewhere the peer sent the 2462 * cookie on another address besides the single address our assoc 2463 * had for him. In this case we will have one of the tie-tags set at 2464 * least AND the address field in the cookie can be used to look it 2465 * up. 2466 */ 2467 to = NULL; 2468 switch (cookie->addr_type) { 2469 #ifdef INET6 2470 case SCTP_IPV6_ADDRESS: 2471 memset(&sin6, 0, sizeof(sin6)); 2472 sin6.sin6_family = AF_INET6; 2473 sin6.sin6_len = sizeof(sin6); 2474 sin6.sin6_port = sh->src_port; 2475 sin6.sin6_scope_id = cookie->scope_id; 2476 memcpy(&sin6.sin6_addr.s6_addr, cookie->address, 2477 sizeof(sin6.sin6_addr.s6_addr)); 2478 to = (struct sockaddr *)&sin6; 2479 break; 2480 #endif 2481 #ifdef INET 2482 case SCTP_IPV4_ADDRESS: 2483 memset(&sin, 0, sizeof(sin)); 2484 sin.sin_family = AF_INET; 2485 sin.sin_len = sizeof(sin); 2486 sin.sin_port = sh->src_port; 2487 sin.sin_addr.s_addr = cookie->address[0]; 2488 to = (struct sockaddr *)&sin; 2489 break; 2490 #endif 2491 default: 2492 /* This should not happen */ 2493 return (NULL); 2494 } 2495 if (*stcb == NULL) { 2496 /* Yep, lets check */ 2497 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL); 2498 if (*stcb == NULL) { 2499 /* 2500 * We should have only got back the same inp. If we 2501 * got back a different ep we have a problem. The 2502 * original findep got back l_inp and now 2503 */ 2504 if (l_inp != *inp_p) { 2505 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n"); 2506 } 2507 } else { 2508 if (*locked_tcb == NULL) { 2509 /* 2510 * In this case we found the assoc only 2511 * after we locked the create lock. This 2512 * means we are in a colliding case and we 2513 * must make sure that we unlock the tcb if 2514 * its one of the cases where we throw away 2515 * the incoming packets. 2516 */ 2517 *locked_tcb = *stcb; 2518 2519 /* 2520 * We must also increment the inp ref count 2521 * since the ref_count flags was set when we 2522 * did not find the TCB, now we found it 2523 * which reduces the refcount.. we must 2524 * raise it back out to balance it all :-) 2525 */ 2526 SCTP_INP_INCR_REF((*stcb)->sctp_ep); 2527 if ((*stcb)->sctp_ep != l_inp) { 2528 SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n", 2529 (void *)(*stcb)->sctp_ep, (void *)l_inp); 2530 } 2531 } 2532 } 2533 } 2534 2535 cookie_len -= SCTP_SIGNATURE_SIZE; 2536 if (*stcb == NULL) { 2537 /* this is the "normal" case... get a new TCB */ 2538 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh, 2539 cookie, cookie_len, *inp_p, 2540 netp, to, ¬ification, 2541 auth_skipped, auth_offset, auth_len, 2542 mflowtype, mflowid, 2543 vrf_id, port); 2544 } else { 2545 /* this is abnormal... cookie-echo on existing TCB */ 2546 had_a_existing_tcb = 1; 2547 *stcb = sctp_process_cookie_existing(m, iphlen, offset, 2548 src, dst, sh, 2549 cookie, cookie_len, *inp_p, *stcb, netp, to, 2550 ¬ification, auth_skipped, auth_offset, auth_len, 2551 mflowtype, mflowid, 2552 vrf_id, port); 2553 if (*stcb == NULL) { 2554 *locked_tcb = NULL; 2555 } 2556 } 2557 2558 if (*stcb == NULL) { 2559 /* still no TCB... must be bad cookie-echo */ 2560 return (NULL); 2561 } 2562 if (*netp != NULL) { 2563 (*netp)->flowtype = mflowtype; 2564 (*netp)->flowid = mflowid; 2565 } 2566 /* 2567 * Ok, we built an association so confirm the address we sent the 2568 * INIT-ACK to. 2569 */ 2570 netl = sctp_findnet(*stcb, to); 2571 /* 2572 * This code should in theory NOT run but 2573 */ 2574 if (netl == NULL) { 2575 /* TSNH! Huh, why do I need to add this address here? */ 2576 if (sctp_add_remote_addr(*stcb, to, NULL, port, 2577 SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) { 2578 return (NULL); 2579 } 2580 netl = sctp_findnet(*stcb, to); 2581 } 2582 if (netl) { 2583 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) { 2584 netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 2585 (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL, 2586 netl); 2587 send_int_conf = 1; 2588 } 2589 } 2590 sctp_start_net_timers(*stcb); 2591 if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) { 2592 if (!had_a_existing_tcb || 2593 (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) { 2594 /* 2595 * If we have a NEW cookie or the connect never 2596 * reached the connected state during collision we 2597 * must do the TCP accept thing. 2598 */ 2599 struct socket *so, *oso; 2600 struct sctp_inpcb *inp; 2601 2602 if (notification == SCTP_NOTIFY_ASSOC_RESTART) { 2603 /* 2604 * For a restart we will keep the same 2605 * socket, no need to do anything. I THINK!! 2606 */ 2607 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2608 if (send_int_conf) { 2609 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2610 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2611 } 2612 return (m); 2613 } 2614 oso = (*inp_p)->sctp_socket; 2615 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2616 SCTP_TCB_UNLOCK((*stcb)); 2617 CURVNET_SET(oso->so_vnet); 2618 so = sonewconn(oso, 0 2619 ); 2620 CURVNET_RESTORE(); 2621 SCTP_TCB_LOCK((*stcb)); 2622 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2623 2624 if (so == NULL) { 2625 struct mbuf *op_err; 2626 2627 /* Too many sockets */ 2628 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n"); 2629 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2630 sctp_abort_association(*inp_p, NULL, m, iphlen, 2631 src, dst, sh, op_err, 2632 mflowtype, mflowid, 2633 vrf_id, port); 2634 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, 2635 SCTP_FROM_SCTP_INPUT + SCTP_LOC_23); 2636 return (NULL); 2637 } 2638 inp = (struct sctp_inpcb *)so->so_pcb; 2639 SCTP_INP_INCR_REF(inp); 2640 /* 2641 * We add the unbound flag here so that if we get an 2642 * soabort() before we get the move_pcb done, we 2643 * will properly cleanup. 2644 */ 2645 inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE | 2646 SCTP_PCB_FLAGS_CONNECTED | 2647 SCTP_PCB_FLAGS_IN_TCPPOOL | 2648 SCTP_PCB_FLAGS_UNBOUND | 2649 (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) | 2650 SCTP_PCB_FLAGS_DONT_WAKE); 2651 inp->sctp_features = (*inp_p)->sctp_features; 2652 inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features; 2653 inp->sctp_socket = so; 2654 inp->sctp_frag_point = (*inp_p)->sctp_frag_point; 2655 inp->max_cwnd = (*inp_p)->max_cwnd; 2656 inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off; 2657 inp->ecn_supported = (*inp_p)->ecn_supported; 2658 inp->prsctp_supported = (*inp_p)->prsctp_supported; 2659 inp->auth_supported = (*inp_p)->auth_supported; 2660 inp->asconf_supported = (*inp_p)->asconf_supported; 2661 inp->reconfig_supported = (*inp_p)->reconfig_supported; 2662 inp->nrsack_supported = (*inp_p)->nrsack_supported; 2663 inp->pktdrop_supported = (*inp_p)->pktdrop_supported; 2664 inp->partial_delivery_point = (*inp_p)->partial_delivery_point; 2665 inp->sctp_context = (*inp_p)->sctp_context; 2666 inp->local_strreset_support = (*inp_p)->local_strreset_support; 2667 inp->fibnum = (*inp_p)->fibnum; 2668 /* 2669 * copy in the authentication parameters from the 2670 * original endpoint 2671 */ 2672 if (inp->sctp_ep.local_hmacs) 2673 sctp_free_hmaclist(inp->sctp_ep.local_hmacs); 2674 inp->sctp_ep.local_hmacs = 2675 sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs); 2676 if (inp->sctp_ep.local_auth_chunks) 2677 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks); 2678 inp->sctp_ep.local_auth_chunks = 2679 sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks); 2680 2681 /* 2682 * Now we must move it from one hash table to 2683 * another and get the tcb in the right place. 2684 */ 2685 2686 /* 2687 * This is where the one-2-one socket is put into 2688 * the accept state waiting for the accept! 2689 */ 2690 if (*stcb) { 2691 SCTP_ADD_SUBSTATE(*stcb, SCTP_STATE_IN_ACCEPT_QUEUE); 2692 } 2693 sctp_move_pcb_and_assoc(*inp_p, inp, *stcb); 2694 2695 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2696 SCTP_TCB_UNLOCK((*stcb)); 2697 2698 sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb, 2699 0); 2700 SCTP_TCB_LOCK((*stcb)); 2701 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2702 2703 /* 2704 * now we must check to see if we were aborted while 2705 * the move was going on and the lock/unlock 2706 * happened. 2707 */ 2708 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 2709 /* 2710 * yep it was, we leave the assoc attached 2711 * to the socket since the sctp_inpcb_free() 2712 * call will send an abort for us. 2713 */ 2714 SCTP_INP_DECR_REF(inp); 2715 return (NULL); 2716 } 2717 SCTP_INP_DECR_REF(inp); 2718 /* Switch over to the new guy */ 2719 *inp_p = inp; 2720 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2721 if (send_int_conf) { 2722 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2723 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2724 } 2725 2726 /* 2727 * Pull it from the incomplete queue and wake the 2728 * guy 2729 */ 2730 soisconnected(so); 2731 return (m); 2732 } 2733 } 2734 if (notification) { 2735 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2736 } 2737 if (send_int_conf) { 2738 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2739 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2740 } 2741 return (m); 2742 } 2743 2744 static void 2745 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED, 2746 struct sctp_tcb *stcb, struct sctp_nets *net) 2747 { 2748 /* cp must not be used, others call this without a c-ack :-) */ 2749 struct sctp_association *asoc; 2750 struct sctp_tmit_chunk *chk; 2751 2752 SCTPDBG(SCTP_DEBUG_INPUT2, 2753 "sctp_handle_cookie_ack: handling COOKIE-ACK\n"); 2754 if ((stcb == NULL) || (net == NULL)) { 2755 return; 2756 } 2757 2758 asoc = &stcb->asoc; 2759 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 2760 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 2761 asoc->overall_error_count, 2762 0, 2763 SCTP_FROM_SCTP_INPUT, 2764 __LINE__); 2765 } 2766 asoc->overall_error_count = 0; 2767 sctp_stop_all_cookie_timers(stcb); 2768 /* process according to association state */ 2769 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) { 2770 /* state change only needed when I am in right state */ 2771 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2772 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 2773 sctp_start_net_timers(stcb); 2774 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2775 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2776 stcb->sctp_ep, stcb, NULL); 2777 } 2778 /* update RTO */ 2779 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 2780 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2781 if (asoc->overall_error_count == 0) { 2782 sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, 2783 SCTP_RTT_FROM_NON_DATA); 2784 } 2785 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 2786 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2787 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2788 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 2789 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2790 if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) { 2791 soisconnected(stcb->sctp_socket); 2792 } 2793 } 2794 /* 2795 * since we did not send a HB make sure we don't double 2796 * things 2797 */ 2798 net->hb_responded = 1; 2799 2800 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2801 /* 2802 * We don't need to do the asconf thing, nor hb or 2803 * autoclose if the socket is closed. 2804 */ 2805 goto closed_socket; 2806 } 2807 2808 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 2809 stcb, net); 2810 2811 if (stcb->asoc.sctp_autoclose_ticks && 2812 sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2813 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 2814 stcb->sctp_ep, stcb, NULL); 2815 } 2816 /* 2817 * send ASCONF if parameters are pending and ASCONFs are 2818 * allowed (eg. addresses changed when init/cookie echo were 2819 * in flight) 2820 */ 2821 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) && 2822 (stcb->asoc.asconf_supported == 1) && 2823 (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) { 2824 #ifdef SCTP_TIMER_BASED_ASCONF 2825 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, 2826 stcb->sctp_ep, stcb, 2827 stcb->asoc.primary_destination); 2828 #else 2829 sctp_send_asconf(stcb, stcb->asoc.primary_destination, 2830 SCTP_ADDR_NOT_LOCKED); 2831 #endif 2832 } 2833 } 2834 closed_socket: 2835 /* Toss the cookie if I can */ 2836 sctp_toss_old_cookies(stcb, asoc); 2837 /* Restart the timer if we have pending data */ 2838 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) { 2839 if (chk->whoTo != NULL) { 2840 break; 2841 } 2842 } 2843 if (chk != NULL) { 2844 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 2845 } 2846 } 2847 2848 static void 2849 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp, 2850 struct sctp_tcb *stcb) 2851 { 2852 struct sctp_nets *net; 2853 struct sctp_tmit_chunk *lchk; 2854 struct sctp_ecne_chunk bkup; 2855 uint8_t override_bit; 2856 uint32_t tsn, window_data_tsn; 2857 int len; 2858 unsigned int pkt_cnt; 2859 2860 len = ntohs(cp->ch.chunk_length); 2861 if (len == sizeof(struct old_sctp_ecne_chunk)) { 2862 /* Its the old format */ 2863 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk)); 2864 bkup.num_pkts_since_cwr = htonl(1); 2865 cp = &bkup; 2866 } 2867 SCTP_STAT_INCR(sctps_recvecne); 2868 tsn = ntohl(cp->tsn); 2869 pkt_cnt = ntohl(cp->num_pkts_since_cwr); 2870 lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead); 2871 if (lchk == NULL) { 2872 window_data_tsn = stcb->asoc.sending_seq - 1; 2873 } else { 2874 window_data_tsn = lchk->rec.data.tsn; 2875 } 2876 2877 /* Find where it was sent to if possible. */ 2878 net = NULL; 2879 TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) { 2880 if (lchk->rec.data.tsn == tsn) { 2881 net = lchk->whoTo; 2882 net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send; 2883 break; 2884 } 2885 if (SCTP_TSN_GT(lchk->rec.data.tsn, tsn)) { 2886 break; 2887 } 2888 } 2889 if (net == NULL) { 2890 /* 2891 * What to do. A previous send of a CWR was possibly lost. 2892 * See how old it is, we may have it marked on the actual 2893 * net. 2894 */ 2895 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 2896 if (tsn == net->last_cwr_tsn) { 2897 /* Found him, send it off */ 2898 break; 2899 } 2900 } 2901 if (net == NULL) { 2902 /* 2903 * If we reach here, we need to send a special CWR 2904 * that says hey, we did this a long time ago and 2905 * you lost the response. 2906 */ 2907 net = TAILQ_FIRST(&stcb->asoc.nets); 2908 if (net == NULL) { 2909 /* TSNH */ 2910 return; 2911 } 2912 override_bit = SCTP_CWR_REDUCE_OVERRIDE; 2913 } else { 2914 override_bit = 0; 2915 } 2916 } else { 2917 override_bit = 0; 2918 } 2919 if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) && 2920 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 2921 /* 2922 * JRS - Use the congestion control given in the pluggable 2923 * CC module 2924 */ 2925 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt); 2926 /* 2927 * We reduce once every RTT. So we will only lower cwnd at 2928 * the next sending seq i.e. the window_data_tsn 2929 */ 2930 net->cwr_window_tsn = window_data_tsn; 2931 net->ecn_ce_pkt_cnt += pkt_cnt; 2932 net->lost_cnt = pkt_cnt; 2933 net->last_cwr_tsn = tsn; 2934 } else { 2935 override_bit |= SCTP_CWR_IN_SAME_WINDOW; 2936 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) && 2937 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 2938 /* 2939 * Another loss in the same window update how many 2940 * marks/packets lost we have had. 2941 */ 2942 int cnt = 1; 2943 2944 if (pkt_cnt > net->lost_cnt) { 2945 /* Should be the case */ 2946 cnt = (pkt_cnt - net->lost_cnt); 2947 net->ecn_ce_pkt_cnt += cnt; 2948 } 2949 net->lost_cnt = pkt_cnt; 2950 net->last_cwr_tsn = tsn; 2951 /* 2952 * Most CC functions will ignore this call, since we 2953 * are in-window yet of the initial CE the peer saw. 2954 */ 2955 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt); 2956 } 2957 } 2958 /* 2959 * We always send a CWR this way if our previous one was lost our 2960 * peer will get an update, or if it is not time again to reduce we 2961 * still get the cwr to the peer. Note we set the override when we 2962 * could not find the TSN on the chunk or the destination network. 2963 */ 2964 sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit); 2965 } 2966 2967 static void 2968 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net) 2969 { 2970 /* 2971 * Here we get a CWR from the peer. We must look in the outqueue and 2972 * make sure that we have a covered ECNE in the control chunk part. 2973 * If so remove it. 2974 */ 2975 struct sctp_tmit_chunk *chk, *nchk; 2976 struct sctp_ecne_chunk *ecne; 2977 int override; 2978 uint32_t cwr_tsn; 2979 2980 cwr_tsn = ntohl(cp->tsn); 2981 override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE; 2982 TAILQ_FOREACH_SAFE(chk, &stcb->asoc.control_send_queue, sctp_next, nchk) { 2983 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) { 2984 continue; 2985 } 2986 if ((override == 0) && (chk->whoTo != net)) { 2987 /* Must be from the right src unless override is set */ 2988 continue; 2989 } 2990 ecne = mtod(chk->data, struct sctp_ecne_chunk *); 2991 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) { 2992 /* this covers this ECNE, we can remove it */ 2993 stcb->asoc.ecn_echo_cnt_onq--; 2994 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, 2995 sctp_next); 2996 stcb->asoc.ctrl_queue_cnt--; 2997 sctp_m_freem(chk->data); 2998 chk->data = NULL; 2999 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3000 if (override == 0) { 3001 break; 3002 } 3003 } 3004 } 3005 } 3006 3007 static void 3008 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED, 3009 struct sctp_tcb *stcb, struct sctp_nets *net) 3010 { 3011 3012 SCTPDBG(SCTP_DEBUG_INPUT2, 3013 "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n"); 3014 if (stcb == NULL) 3015 return; 3016 3017 /* process according to association state */ 3018 if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 3019 /* unexpected SHUTDOWN-COMPLETE... so ignore... */ 3020 SCTPDBG(SCTP_DEBUG_INPUT2, 3021 "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n"); 3022 SCTP_TCB_UNLOCK(stcb); 3023 return; 3024 } 3025 /* notify upper layer protocol */ 3026 if (stcb->sctp_socket) { 3027 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 3028 } 3029 #ifdef INVARIANTS 3030 if (!TAILQ_EMPTY(&stcb->asoc.send_queue) || 3031 !TAILQ_EMPTY(&stcb->asoc.sent_queue) || 3032 sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) { 3033 panic("Queues are not empty when handling SHUTDOWN-COMPLETE"); 3034 } 3035 #endif 3036 /* stop the timer */ 3037 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, 3038 SCTP_FROM_SCTP_INPUT + SCTP_LOC_24); 3039 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 3040 /* free the TCB */ 3041 SCTPDBG(SCTP_DEBUG_INPUT2, 3042 "sctp_handle_shutdown_complete: calls free-asoc\n"); 3043 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 3044 SCTP_FROM_SCTP_INPUT + SCTP_LOC_25); 3045 return; 3046 } 3047 3048 static int 3049 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc, 3050 struct sctp_nets *net, uint8_t flg) 3051 { 3052 switch (desc->chunk_type) { 3053 case SCTP_DATA: 3054 case SCTP_IDATA: 3055 /* find the tsn to resend (possibly) */ 3056 { 3057 uint32_t tsn; 3058 struct sctp_tmit_chunk *tp1; 3059 3060 tsn = ntohl(desc->tsn_ifany); 3061 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3062 if (tp1->rec.data.tsn == tsn) { 3063 /* found it */ 3064 break; 3065 } 3066 if (SCTP_TSN_GT(tp1->rec.data.tsn, tsn)) { 3067 /* not found */ 3068 tp1 = NULL; 3069 break; 3070 } 3071 } 3072 if (tp1 == NULL) { 3073 /* 3074 * Do it the other way , aka without paying 3075 * attention to queue seq order. 3076 */ 3077 SCTP_STAT_INCR(sctps_pdrpdnfnd); 3078 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3079 if (tp1->rec.data.tsn == tsn) { 3080 /* found it */ 3081 break; 3082 } 3083 } 3084 } 3085 if (tp1 == NULL) { 3086 SCTP_STAT_INCR(sctps_pdrptsnnf); 3087 } 3088 if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) { 3089 if (((flg & SCTP_BADCRC) == 0) && 3090 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3091 return (0); 3092 } 3093 if ((stcb->asoc.peers_rwnd == 0) && 3094 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3095 SCTP_STAT_INCR(sctps_pdrpdiwnp); 3096 return (0); 3097 } 3098 if (stcb->asoc.peers_rwnd == 0 && 3099 (flg & SCTP_FROM_MIDDLE_BOX)) { 3100 SCTP_STAT_INCR(sctps_pdrpdizrw); 3101 return (0); 3102 } 3103 if ((uint32_t)SCTP_BUF_LEN(tp1->data) < 3104 SCTP_DATA_CHUNK_OVERHEAD(stcb) + SCTP_NUM_DB_TO_VERIFY) { 3105 /* Payload not matching. */ 3106 SCTP_STAT_INCR(sctps_pdrpbadd); 3107 return (-1); 3108 } 3109 if (memcmp(mtod(tp1->data, caddr_t)+SCTP_DATA_CHUNK_OVERHEAD(stcb), 3110 desc->data_bytes, SCTP_NUM_DB_TO_VERIFY) != 0) { 3111 /* Payload not matching. */ 3112 SCTP_STAT_INCR(sctps_pdrpbadd); 3113 return (-1); 3114 } 3115 if (tp1->do_rtt) { 3116 /* 3117 * this guy had a RTO calculation 3118 * pending on it, cancel it 3119 */ 3120 if (tp1->whoTo->rto_needed == 0) { 3121 tp1->whoTo->rto_needed = 1; 3122 } 3123 tp1->do_rtt = 0; 3124 } 3125 SCTP_STAT_INCR(sctps_pdrpmark); 3126 if (tp1->sent != SCTP_DATAGRAM_RESEND) 3127 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3128 /* 3129 * mark it as if we were doing a FR, since 3130 * we will be getting gap ack reports behind 3131 * the info from the router. 3132 */ 3133 tp1->rec.data.doing_fast_retransmit = 1; 3134 /* 3135 * mark the tsn with what sequences can 3136 * cause a new FR. 3137 */ 3138 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) { 3139 tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq; 3140 } else { 3141 tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.tsn; 3142 } 3143 3144 /* restart the timer */ 3145 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3146 stcb, tp1->whoTo, 3147 SCTP_FROM_SCTP_INPUT + SCTP_LOC_26); 3148 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3149 stcb, tp1->whoTo); 3150 3151 /* fix counts and things */ 3152 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 3153 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP, 3154 tp1->whoTo->flight_size, 3155 tp1->book_size, 3156 (uint32_t)(uintptr_t)stcb, 3157 tp1->rec.data.tsn); 3158 } 3159 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3160 sctp_flight_size_decrease(tp1); 3161 sctp_total_flight_decrease(stcb, tp1); 3162 } 3163 tp1->sent = SCTP_DATAGRAM_RESEND; 3164 } { 3165 /* audit code */ 3166 unsigned int audit; 3167 3168 audit = 0; 3169 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3170 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3171 audit++; 3172 } 3173 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue, 3174 sctp_next) { 3175 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3176 audit++; 3177 } 3178 if (audit != stcb->asoc.sent_queue_retran_cnt) { 3179 SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n", 3180 audit, stcb->asoc.sent_queue_retran_cnt); 3181 #ifndef SCTP_AUDITING_ENABLED 3182 stcb->asoc.sent_queue_retran_cnt = audit; 3183 #endif 3184 } 3185 } 3186 } 3187 break; 3188 case SCTP_ASCONF: 3189 { 3190 struct sctp_tmit_chunk *asconf; 3191 3192 TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue, 3193 sctp_next) { 3194 if (asconf->rec.chunk_id.id == SCTP_ASCONF) { 3195 break; 3196 } 3197 } 3198 if (asconf) { 3199 if (asconf->sent != SCTP_DATAGRAM_RESEND) 3200 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3201 asconf->sent = SCTP_DATAGRAM_RESEND; 3202 asconf->snd_count--; 3203 } 3204 } 3205 break; 3206 case SCTP_INITIATION: 3207 /* resend the INIT */ 3208 stcb->asoc.dropped_special_cnt++; 3209 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) { 3210 /* 3211 * If we can get it in, in a few attempts we do 3212 * this, otherwise we let the timer fire. 3213 */ 3214 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, 3215 stcb, net, 3216 SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 3217 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 3218 } 3219 break; 3220 case SCTP_SELECTIVE_ACK: 3221 case SCTP_NR_SELECTIVE_ACK: 3222 /* resend the sack */ 3223 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED); 3224 break; 3225 case SCTP_HEARTBEAT_REQUEST: 3226 /* resend a demand HB */ 3227 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) { 3228 /* 3229 * Only retransmit if we KNOW we wont destroy the 3230 * tcb 3231 */ 3232 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 3233 } 3234 break; 3235 case SCTP_SHUTDOWN: 3236 sctp_send_shutdown(stcb, net); 3237 break; 3238 case SCTP_SHUTDOWN_ACK: 3239 sctp_send_shutdown_ack(stcb, net); 3240 break; 3241 case SCTP_COOKIE_ECHO: 3242 { 3243 struct sctp_tmit_chunk *cookie; 3244 3245 cookie = NULL; 3246 TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, 3247 sctp_next) { 3248 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) { 3249 break; 3250 } 3251 } 3252 if (cookie) { 3253 if (cookie->sent != SCTP_DATAGRAM_RESEND) 3254 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3255 cookie->sent = SCTP_DATAGRAM_RESEND; 3256 sctp_stop_all_cookie_timers(stcb); 3257 } 3258 } 3259 break; 3260 case SCTP_COOKIE_ACK: 3261 sctp_send_cookie_ack(stcb); 3262 break; 3263 case SCTP_ASCONF_ACK: 3264 /* resend last asconf ack */ 3265 sctp_send_asconf_ack(stcb); 3266 break; 3267 case SCTP_IFORWARD_CUM_TSN: 3268 case SCTP_FORWARD_CUM_TSN: 3269 send_forward_tsn(stcb, &stcb->asoc); 3270 break; 3271 /* can't do anything with these */ 3272 case SCTP_PACKET_DROPPED: 3273 case SCTP_INITIATION_ACK: /* this should not happen */ 3274 case SCTP_HEARTBEAT_ACK: 3275 case SCTP_ABORT_ASSOCIATION: 3276 case SCTP_OPERATION_ERROR: 3277 case SCTP_SHUTDOWN_COMPLETE: 3278 case SCTP_ECN_ECHO: 3279 case SCTP_ECN_CWR: 3280 default: 3281 break; 3282 } 3283 return (0); 3284 } 3285 3286 void 3287 sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list) 3288 { 3289 uint32_t i; 3290 uint16_t temp; 3291 3292 /* 3293 * We set things to 0xffffffff since this is the last delivered 3294 * sequence and we will be sending in 0 after the reset. 3295 */ 3296 3297 if (number_entries) { 3298 for (i = 0; i < number_entries; i++) { 3299 temp = ntohs(list[i]); 3300 if (temp >= stcb->asoc.streamincnt) { 3301 continue; 3302 } 3303 stcb->asoc.strmin[temp].last_mid_delivered = 0xffffffff; 3304 } 3305 } else { 3306 list = NULL; 3307 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3308 stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff; 3309 } 3310 } 3311 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3312 } 3313 3314 static void 3315 sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list) 3316 { 3317 uint32_t i; 3318 uint16_t temp; 3319 3320 if (number_entries > 0) { 3321 for (i = 0; i < number_entries; i++) { 3322 temp = ntohs(list[i]); 3323 if (temp >= stcb->asoc.streamoutcnt) { 3324 /* no such stream */ 3325 continue; 3326 } 3327 stcb->asoc.strmout[temp].next_mid_ordered = 0; 3328 stcb->asoc.strmout[temp].next_mid_unordered = 0; 3329 } 3330 } else { 3331 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3332 stcb->asoc.strmout[i].next_mid_ordered = 0; 3333 stcb->asoc.strmout[i].next_mid_unordered = 0; 3334 } 3335 } 3336 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3337 } 3338 3339 static void 3340 sctp_reset_clear_pending(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list) 3341 { 3342 uint32_t i; 3343 uint16_t temp; 3344 3345 if (number_entries > 0) { 3346 for (i = 0; i < number_entries; i++) { 3347 temp = ntohs(list[i]); 3348 if (temp >= stcb->asoc.streamoutcnt) { 3349 /* no such stream */ 3350 continue; 3351 } 3352 stcb->asoc.strmout[temp].state = SCTP_STREAM_OPEN; 3353 } 3354 } else { 3355 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3356 stcb->asoc.strmout[i].state = SCTP_STREAM_OPEN; 3357 } 3358 } 3359 } 3360 3361 struct sctp_stream_reset_request * 3362 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk) 3363 { 3364 struct sctp_association *asoc; 3365 struct sctp_chunkhdr *ch; 3366 struct sctp_stream_reset_request *r; 3367 struct sctp_tmit_chunk *chk; 3368 int len, clen; 3369 3370 asoc = &stcb->asoc; 3371 chk = asoc->str_reset; 3372 if (TAILQ_EMPTY(&asoc->control_send_queue) || 3373 (chk == NULL)) { 3374 asoc->stream_reset_outstanding = 0; 3375 return (NULL); 3376 } 3377 if (chk->data == NULL) { 3378 return (NULL); 3379 } 3380 if (bchk != NULL) { 3381 /* he wants a copy of the chk pointer */ 3382 *bchk = chk; 3383 } 3384 clen = chk->send_size; 3385 ch = mtod(chk->data, struct sctp_chunkhdr *); 3386 r = (struct sctp_stream_reset_request *)(ch + 1); 3387 if (ntohl(r->request_seq) == seq) { 3388 /* found it */ 3389 return (r); 3390 } 3391 len = SCTP_SIZE32(ntohs(r->ph.param_length)); 3392 if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) { 3393 /* move to the next one, there can only be a max of two */ 3394 r = (struct sctp_stream_reset_request *)((caddr_t)r + len); 3395 if (ntohl(r->request_seq) == seq) { 3396 return (r); 3397 } 3398 } 3399 /* that seq is not here */ 3400 return (NULL); 3401 } 3402 3403 static void 3404 sctp_clean_up_stream_reset(struct sctp_tcb *stcb) 3405 { 3406 struct sctp_association *asoc; 3407 struct sctp_tmit_chunk *chk; 3408 3409 asoc = &stcb->asoc; 3410 chk = asoc->str_reset; 3411 if (chk == NULL) { 3412 return; 3413 } 3414 asoc->str_reset = NULL; 3415 sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, 3416 NULL, SCTP_FROM_SCTP_INPUT + SCTP_LOC_28); 3417 TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next); 3418 asoc->ctrl_queue_cnt--; 3419 if (chk->data) { 3420 sctp_m_freem(chk->data); 3421 chk->data = NULL; 3422 } 3423 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3424 } 3425 3426 static int 3427 sctp_handle_stream_reset_response(struct sctp_tcb *stcb, 3428 uint32_t seq, uint32_t action, 3429 struct sctp_stream_reset_response *respin) 3430 { 3431 uint16_t type; 3432 int lparam_len; 3433 struct sctp_association *asoc = &stcb->asoc; 3434 struct sctp_tmit_chunk *chk; 3435 struct sctp_stream_reset_request *req_param; 3436 struct sctp_stream_reset_out_request *req_out_param; 3437 struct sctp_stream_reset_in_request *req_in_param; 3438 uint32_t number_entries; 3439 3440 if (asoc->stream_reset_outstanding == 0) { 3441 /* duplicate */ 3442 return (0); 3443 } 3444 if (seq == stcb->asoc.str_reset_seq_out) { 3445 req_param = sctp_find_stream_reset(stcb, seq, &chk); 3446 if (req_param != NULL) { 3447 stcb->asoc.str_reset_seq_out++; 3448 type = ntohs(req_param->ph.param_type); 3449 lparam_len = ntohs(req_param->ph.param_length); 3450 if (type == SCTP_STR_RESET_OUT_REQUEST) { 3451 int no_clear = 0; 3452 3453 req_out_param = (struct sctp_stream_reset_out_request *)req_param; 3454 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t); 3455 asoc->stream_reset_out_is_outstanding = 0; 3456 if (asoc->stream_reset_outstanding) 3457 asoc->stream_reset_outstanding--; 3458 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3459 /* do it */ 3460 sctp_reset_out_streams(stcb, number_entries, req_out_param->list_of_streams); 3461 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3462 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3463 } else if (action == SCTP_STREAM_RESET_RESULT_IN_PROGRESS) { 3464 /* 3465 * Set it up so we don't stop 3466 * retransmitting 3467 */ 3468 asoc->stream_reset_outstanding++; 3469 stcb->asoc.str_reset_seq_out--; 3470 asoc->stream_reset_out_is_outstanding = 1; 3471 no_clear = 1; 3472 } else { 3473 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3474 } 3475 if (no_clear == 0) { 3476 sctp_reset_clear_pending(stcb, number_entries, req_out_param->list_of_streams); 3477 } 3478 } else if (type == SCTP_STR_RESET_IN_REQUEST) { 3479 req_in_param = (struct sctp_stream_reset_in_request *)req_param; 3480 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t); 3481 if (asoc->stream_reset_outstanding) 3482 asoc->stream_reset_outstanding--; 3483 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3484 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb, 3485 number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3486 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3487 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb, 3488 number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3489 } 3490 } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) { 3491 /* Ok we now may have more streams */ 3492 int num_stream; 3493 3494 num_stream = stcb->asoc.strm_pending_add_size; 3495 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) { 3496 /* TSNH */ 3497 num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt; 3498 } 3499 stcb->asoc.strm_pending_add_size = 0; 3500 if (asoc->stream_reset_outstanding) 3501 asoc->stream_reset_outstanding--; 3502 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3503 /* Put the new streams into effect */ 3504 int i; 3505 3506 for (i = asoc->streamoutcnt; i < (asoc->streamoutcnt + num_stream); i++) { 3507 asoc->strmout[i].state = SCTP_STREAM_OPEN; 3508 } 3509 asoc->streamoutcnt += num_stream; 3510 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 3511 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3512 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3513 SCTP_STREAM_CHANGE_DENIED); 3514 } else { 3515 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3516 SCTP_STREAM_CHANGE_FAILED); 3517 } 3518 } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) { 3519 if (asoc->stream_reset_outstanding) 3520 asoc->stream_reset_outstanding--; 3521 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3522 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3523 SCTP_STREAM_CHANGE_DENIED); 3524 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3525 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3526 SCTP_STREAM_CHANGE_FAILED); 3527 } 3528 } else if (type == SCTP_STR_RESET_TSN_REQUEST) { 3529 /** 3530 * a) Adopt the new in tsn. 3531 * b) reset the map 3532 * c) Adopt the new out-tsn 3533 */ 3534 struct sctp_stream_reset_response_tsn *resp; 3535 struct sctp_forward_tsn_chunk fwdtsn; 3536 int abort_flag = 0; 3537 3538 if (respin == NULL) { 3539 /* huh ? */ 3540 return (0); 3541 } 3542 if (ntohs(respin->ph.param_length) < sizeof(struct sctp_stream_reset_response_tsn)) { 3543 return (0); 3544 } 3545 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3546 resp = (struct sctp_stream_reset_response_tsn *)respin; 3547 asoc->stream_reset_outstanding--; 3548 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3549 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3550 fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1); 3551 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3552 if (abort_flag) { 3553 return (1); 3554 } 3555 stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1); 3556 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3557 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3558 } 3559 3560 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 3561 stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn); 3562 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 3563 3564 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map; 3565 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size); 3566 3567 stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn); 3568 stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn; 3569 3570 sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL); 3571 sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL); 3572 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0); 3573 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3574 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3575 SCTP_ASSOC_RESET_DENIED); 3576 } else { 3577 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3578 SCTP_ASSOC_RESET_FAILED); 3579 } 3580 } 3581 /* get rid of the request and get the request flags */ 3582 if (asoc->stream_reset_outstanding == 0) { 3583 sctp_clean_up_stream_reset(stcb); 3584 } 3585 } 3586 } 3587 if (asoc->stream_reset_outstanding == 0) { 3588 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED); 3589 } 3590 return (0); 3591 } 3592 3593 static void 3594 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb, 3595 struct sctp_tmit_chunk *chk, 3596 struct sctp_stream_reset_in_request *req, int trunc) 3597 { 3598 uint32_t seq; 3599 int len, i; 3600 int number_entries; 3601 uint16_t temp; 3602 3603 /* 3604 * peer wants me to send a str-reset to him for my outgoing seq's if 3605 * seq_in is right. 3606 */ 3607 struct sctp_association *asoc = &stcb->asoc; 3608 3609 seq = ntohl(req->request_seq); 3610 if (asoc->str_reset_seq_in == seq) { 3611 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3612 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3613 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3614 } else if (trunc) { 3615 /* Can't do it, since they exceeded our buffer size */ 3616 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3617 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) { 3618 len = ntohs(req->ph.param_length); 3619 number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t)); 3620 if (number_entries) { 3621 for (i = 0; i < number_entries; i++) { 3622 temp = ntohs(req->list_of_streams[i]); 3623 if (temp >= stcb->asoc.streamoutcnt) { 3624 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3625 goto bad_boy; 3626 } 3627 req->list_of_streams[i] = temp; 3628 } 3629 for (i = 0; i < number_entries; i++) { 3630 if (stcb->asoc.strmout[req->list_of_streams[i]].state == SCTP_STREAM_OPEN) { 3631 stcb->asoc.strmout[req->list_of_streams[i]].state = SCTP_STREAM_RESET_PENDING; 3632 } 3633 } 3634 } else { 3635 /* Its all */ 3636 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3637 if (stcb->asoc.strmout[i].state == SCTP_STREAM_OPEN) 3638 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_PENDING; 3639 } 3640 } 3641 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3642 } else { 3643 /* Can't do it, since we have sent one out */ 3644 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 3645 } 3646 bad_boy: 3647 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3648 asoc->str_reset_seq_in++; 3649 } else if (asoc->str_reset_seq_in - 1 == seq) { 3650 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3651 } else if (asoc->str_reset_seq_in - 2 == seq) { 3652 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3653 } else { 3654 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3655 } 3656 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED); 3657 } 3658 3659 static int 3660 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb, 3661 struct sctp_tmit_chunk *chk, 3662 struct sctp_stream_reset_tsn_request *req) 3663 { 3664 /* reset all in and out and update the tsn */ 3665 /* 3666 * A) reset my str-seq's on in and out. B) Select a receive next, 3667 * and set cum-ack to it. Also process this selected number as a 3668 * fwd-tsn as well. C) set in the response my next sending seq. 3669 */ 3670 struct sctp_forward_tsn_chunk fwdtsn; 3671 struct sctp_association *asoc = &stcb->asoc; 3672 int abort_flag = 0; 3673 uint32_t seq; 3674 3675 seq = ntohl(req->request_seq); 3676 if (asoc->str_reset_seq_in == seq) { 3677 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3678 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 3679 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3680 } else { 3681 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3682 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3683 fwdtsn.ch.chunk_flags = 0; 3684 fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1); 3685 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3686 if (abort_flag) { 3687 return (1); 3688 } 3689 asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA; 3690 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3691 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3692 } 3693 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map; 3694 asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1; 3695 memset(asoc->mapping_array, 0, asoc->mapping_array_size); 3696 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 3697 memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size); 3698 atomic_add_int(&asoc->sending_seq, 1); 3699 /* save off historical data for retrans */ 3700 asoc->last_sending_seq[1] = asoc->last_sending_seq[0]; 3701 asoc->last_sending_seq[0] = asoc->sending_seq; 3702 asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0]; 3703 asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn; 3704 sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL); 3705 sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL); 3706 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3707 sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0); 3708 } 3709 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3710 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3711 asoc->str_reset_seq_in++; 3712 } else if (asoc->str_reset_seq_in - 1 == seq) { 3713 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3714 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3715 } else if (asoc->str_reset_seq_in - 2 == seq) { 3716 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1], 3717 asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]); 3718 } else { 3719 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3720 } 3721 return (0); 3722 } 3723 3724 static void 3725 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb, 3726 struct sctp_tmit_chunk *chk, 3727 struct sctp_stream_reset_out_request *req, int trunc) 3728 { 3729 uint32_t seq, tsn; 3730 int number_entries, len; 3731 struct sctp_association *asoc = &stcb->asoc; 3732 3733 seq = ntohl(req->request_seq); 3734 3735 /* now if its not a duplicate we process it */ 3736 if (asoc->str_reset_seq_in == seq) { 3737 len = ntohs(req->ph.param_length); 3738 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t)); 3739 /* 3740 * the sender is resetting, handle the list issue.. we must 3741 * a) verify if we can do the reset, if so no problem b) If 3742 * we can't do the reset we must copy the request. c) queue 3743 * it, and setup the data in processor to trigger it off 3744 * when needed and dequeue all the queued data. 3745 */ 3746 tsn = ntohl(req->send_reset_at_tsn); 3747 3748 /* move the reset action back one */ 3749 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3750 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3751 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3752 } else if (trunc) { 3753 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3754 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) { 3755 /* we can do it now */ 3756 sctp_reset_in_stream(stcb, number_entries, req->list_of_streams); 3757 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3758 } else { 3759 /* 3760 * we must queue it up and thus wait for the TSN's 3761 * to arrive that are at or before tsn 3762 */ 3763 struct sctp_stream_reset_list *liste; 3764 int siz; 3765 3766 siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t)); 3767 SCTP_MALLOC(liste, struct sctp_stream_reset_list *, 3768 siz, SCTP_M_STRESET); 3769 if (liste == NULL) { 3770 /* gak out of memory */ 3771 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3772 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3773 return; 3774 } 3775 liste->seq = seq; 3776 liste->tsn = tsn; 3777 liste->number_entries = number_entries; 3778 memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t)); 3779 TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp); 3780 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_IN_PROGRESS; 3781 } 3782 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3783 asoc->str_reset_seq_in++; 3784 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3785 /* 3786 * one seq back, just echo back last action since my 3787 * response was lost. 3788 */ 3789 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3790 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3791 /* 3792 * two seq back, just echo back last action since my 3793 * response was lost. 3794 */ 3795 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3796 } else { 3797 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3798 } 3799 } 3800 3801 static void 3802 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 3803 struct sctp_stream_reset_add_strm *str_add) 3804 { 3805 /* 3806 * Peer is requesting to add more streams. If its within our 3807 * max-streams we will allow it. 3808 */ 3809 uint32_t num_stream, i; 3810 uint32_t seq; 3811 struct sctp_association *asoc = &stcb->asoc; 3812 struct sctp_queued_to_read *ctl, *nctl; 3813 3814 /* Get the number. */ 3815 seq = ntohl(str_add->request_seq); 3816 num_stream = ntohs(str_add->number_of_streams); 3817 /* Now what would be the new total? */ 3818 if (asoc->str_reset_seq_in == seq) { 3819 num_stream += stcb->asoc.streamincnt; 3820 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3821 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 3822 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3823 } else if ((num_stream > stcb->asoc.max_inbound_streams) || 3824 (num_stream > 0xffff)) { 3825 /* We must reject it they ask for to many */ 3826 denied: 3827 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3828 } else { 3829 /* Ok, we can do that :-) */ 3830 struct sctp_stream_in *oldstrm; 3831 3832 /* save off the old */ 3833 oldstrm = stcb->asoc.strmin; 3834 SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *, 3835 (num_stream * sizeof(struct sctp_stream_in)), 3836 SCTP_M_STRMI); 3837 if (stcb->asoc.strmin == NULL) { 3838 stcb->asoc.strmin = oldstrm; 3839 goto denied; 3840 } 3841 /* copy off the old data */ 3842 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3843 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 3844 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue); 3845 stcb->asoc.strmin[i].sid = i; 3846 stcb->asoc.strmin[i].last_mid_delivered = oldstrm[i].last_mid_delivered; 3847 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started; 3848 stcb->asoc.strmin[i].pd_api_started = oldstrm[i].pd_api_started; 3849 /* now anything on those queues? */ 3850 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next_instrm, nctl) { 3851 TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next_instrm); 3852 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next_instrm); 3853 } 3854 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].uno_inqueue, next_instrm, nctl) { 3855 TAILQ_REMOVE(&oldstrm[i].uno_inqueue, ctl, next_instrm); 3856 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].uno_inqueue, ctl, next_instrm); 3857 } 3858 } 3859 /* Init the new streams */ 3860 for (i = stcb->asoc.streamincnt; i < num_stream; i++) { 3861 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 3862 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue); 3863 stcb->asoc.strmin[i].sid = i; 3864 stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff; 3865 stcb->asoc.strmin[i].pd_api_started = 0; 3866 stcb->asoc.strmin[i].delivery_started = 0; 3867 } 3868 SCTP_FREE(oldstrm, SCTP_M_STRMI); 3869 /* update the size */ 3870 stcb->asoc.streamincnt = num_stream; 3871 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3872 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 3873 } 3874 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3875 asoc->str_reset_seq_in++; 3876 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3877 /* 3878 * one seq back, just echo back last action since my 3879 * response was lost. 3880 */ 3881 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3882 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3883 /* 3884 * two seq back, just echo back last action since my 3885 * response was lost. 3886 */ 3887 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3888 } else { 3889 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3890 } 3891 } 3892 3893 static void 3894 sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 3895 struct sctp_stream_reset_add_strm *str_add) 3896 { 3897 /* 3898 * Peer is requesting to add more streams. If its within our 3899 * max-streams we will allow it. 3900 */ 3901 uint16_t num_stream; 3902 uint32_t seq; 3903 struct sctp_association *asoc = &stcb->asoc; 3904 3905 /* Get the number. */ 3906 seq = ntohl(str_add->request_seq); 3907 num_stream = ntohs(str_add->number_of_streams); 3908 /* Now what would be the new total? */ 3909 if (asoc->str_reset_seq_in == seq) { 3910 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3911 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 3912 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3913 } else if (stcb->asoc.stream_reset_outstanding) { 3914 /* We must reject it we have something pending */ 3915 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 3916 } else { 3917 /* Ok, we can do that :-) */ 3918 int mychk; 3919 3920 mychk = stcb->asoc.streamoutcnt; 3921 mychk += num_stream; 3922 if (mychk < 0x10000) { 3923 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3924 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 1, num_stream, 0, 1)) { 3925 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3926 } 3927 } else { 3928 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3929 } 3930 } 3931 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]); 3932 asoc->str_reset_seq_in++; 3933 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3934 /* 3935 * one seq back, just echo back last action since my 3936 * response was lost. 3937 */ 3938 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3939 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3940 /* 3941 * two seq back, just echo back last action since my 3942 * response was lost. 3943 */ 3944 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3945 } else { 3946 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3947 } 3948 } 3949 3950 #ifdef __GNUC__ 3951 __attribute__((noinline)) 3952 #endif 3953 static int 3954 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset, 3955 struct sctp_chunkhdr *ch_req) 3956 { 3957 uint16_t remaining_length, param_len, ptype; 3958 struct sctp_paramhdr pstore; 3959 uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE]; 3960 uint32_t seq = 0; 3961 int num_req = 0; 3962 int trunc = 0; 3963 struct sctp_tmit_chunk *chk; 3964 struct sctp_chunkhdr *ch; 3965 struct sctp_paramhdr *ph; 3966 int ret_code = 0; 3967 int num_param = 0; 3968 3969 /* now it may be a reset or a reset-response */ 3970 remaining_length = ntohs(ch_req->chunk_length) - sizeof(struct sctp_chunkhdr); 3971 3972 /* setup for adding the response */ 3973 sctp_alloc_a_chunk(stcb, chk); 3974 if (chk == NULL) { 3975 return (ret_code); 3976 } 3977 chk->copy_by_ref = 0; 3978 chk->rec.chunk_id.id = SCTP_STREAM_RESET; 3979 chk->rec.chunk_id.can_take_data = 0; 3980 chk->flags = 0; 3981 chk->asoc = &stcb->asoc; 3982 chk->no_fr_allowed = 0; 3983 chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr); 3984 chk->book_size_scale = 0; 3985 chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA); 3986 if (chk->data == NULL) { 3987 strres_nochunk: 3988 if (chk->data) { 3989 sctp_m_freem(chk->data); 3990 chk->data = NULL; 3991 } 3992 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3993 return (ret_code); 3994 } 3995 SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD); 3996 3997 /* setup chunk parameters */ 3998 chk->sent = SCTP_DATAGRAM_UNSENT; 3999 chk->snd_count = 0; 4000 chk->whoTo = NULL; 4001 4002 ch = mtod(chk->data, struct sctp_chunkhdr *); 4003 ch->chunk_type = SCTP_STREAM_RESET; 4004 ch->chunk_flags = 0; 4005 ch->chunk_length = htons(chk->send_size); 4006 SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size); 4007 offset += sizeof(struct sctp_chunkhdr); 4008 while (remaining_length >= sizeof(struct sctp_paramhdr)) { 4009 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *)&pstore); 4010 if (ph == NULL) { 4011 /* TSNH */ 4012 break; 4013 } 4014 param_len = ntohs(ph->param_length); 4015 if ((param_len > remaining_length) || 4016 (param_len < (sizeof(struct sctp_paramhdr) + sizeof(uint32_t)))) { 4017 /* bad parameter length */ 4018 break; 4019 } 4020 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, sizeof(cstore)), 4021 (uint8_t *)&cstore); 4022 if (ph == NULL) { 4023 /* TSNH */ 4024 break; 4025 } 4026 ptype = ntohs(ph->param_type); 4027 num_param++; 4028 if (param_len > sizeof(cstore)) { 4029 trunc = 1; 4030 } else { 4031 trunc = 0; 4032 } 4033 if (num_param > SCTP_MAX_RESET_PARAMS) { 4034 /* hit the max of parameters already sorry.. */ 4035 break; 4036 } 4037 if (ptype == SCTP_STR_RESET_OUT_REQUEST) { 4038 struct sctp_stream_reset_out_request *req_out; 4039 4040 if (param_len < sizeof(struct sctp_stream_reset_out_request)) { 4041 break; 4042 } 4043 req_out = (struct sctp_stream_reset_out_request *)ph; 4044 num_req++; 4045 if (stcb->asoc.stream_reset_outstanding) { 4046 seq = ntohl(req_out->response_seq); 4047 if (seq == stcb->asoc.str_reset_seq_out) { 4048 /* implicit ack */ 4049 (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL); 4050 } 4051 } 4052 sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc); 4053 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) { 4054 struct sctp_stream_reset_add_strm *str_add; 4055 4056 if (param_len < sizeof(struct sctp_stream_reset_add_strm)) { 4057 break; 4058 } 4059 str_add = (struct sctp_stream_reset_add_strm *)ph; 4060 num_req++; 4061 sctp_handle_str_reset_add_strm(stcb, chk, str_add); 4062 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) { 4063 struct sctp_stream_reset_add_strm *str_add; 4064 4065 if (param_len < sizeof(struct sctp_stream_reset_add_strm)) { 4066 break; 4067 } 4068 str_add = (struct sctp_stream_reset_add_strm *)ph; 4069 num_req++; 4070 sctp_handle_str_reset_add_out_strm(stcb, chk, str_add); 4071 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) { 4072 struct sctp_stream_reset_in_request *req_in; 4073 4074 num_req++; 4075 req_in = (struct sctp_stream_reset_in_request *)ph; 4076 sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc); 4077 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) { 4078 struct sctp_stream_reset_tsn_request *req_tsn; 4079 4080 num_req++; 4081 req_tsn = (struct sctp_stream_reset_tsn_request *)ph; 4082 if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) { 4083 ret_code = 1; 4084 goto strres_nochunk; 4085 } 4086 /* no more */ 4087 break; 4088 } else if (ptype == SCTP_STR_RESET_RESPONSE) { 4089 struct sctp_stream_reset_response *resp; 4090 uint32_t result; 4091 4092 if (param_len < sizeof(struct sctp_stream_reset_response)) { 4093 break; 4094 } 4095 resp = (struct sctp_stream_reset_response *)ph; 4096 seq = ntohl(resp->response_seq); 4097 result = ntohl(resp->result); 4098 if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) { 4099 ret_code = 1; 4100 goto strres_nochunk; 4101 } 4102 } else { 4103 break; 4104 } 4105 offset += SCTP_SIZE32(param_len); 4106 if (remaining_length >= SCTP_SIZE32(param_len)) { 4107 remaining_length -= SCTP_SIZE32(param_len); 4108 } else { 4109 remaining_length = 0; 4110 } 4111 } 4112 if (num_req == 0) { 4113 /* we have no response free the stuff */ 4114 goto strres_nochunk; 4115 } 4116 /* ok we have a chunk to link in */ 4117 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, 4118 chk, 4119 sctp_next); 4120 stcb->asoc.ctrl_queue_cnt++; 4121 return (ret_code); 4122 } 4123 4124 /* 4125 * Handle a router or endpoints report of a packet loss, there are two ways 4126 * to handle this, either we get the whole packet and must disect it 4127 * ourselves (possibly with truncation and or corruption) or it is a summary 4128 * from a middle box that did the disectting for us. 4129 */ 4130 static void 4131 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp, 4132 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 4133 { 4134 struct sctp_chunk_desc desc; 4135 struct sctp_chunkhdr *chk_hdr; 4136 struct sctp_data_chunk *data_chunk; 4137 struct sctp_idata_chunk *idata_chunk; 4138 uint32_t bottle_bw, on_queue; 4139 uint32_t offset, chk_len; 4140 uint16_t pktdrp_len; 4141 uint8_t pktdrp_flags; 4142 4143 KASSERT(sizeof(struct sctp_pktdrop_chunk) <= limit, 4144 ("PKTDROP chunk too small")); 4145 pktdrp_flags = cp->ch.chunk_flags; 4146 pktdrp_len = ntohs(cp->ch.chunk_length); 4147 KASSERT(limit <= pktdrp_len, ("Inconsistent limit")); 4148 if (pktdrp_flags & SCTP_PACKET_TRUNCATED) { 4149 if (ntohs(cp->trunc_len) <= pktdrp_len - sizeof(struct sctp_pktdrop_chunk)) { 4150 /* The peer plays games with us. */ 4151 return; 4152 } 4153 } 4154 limit -= sizeof(struct sctp_pktdrop_chunk); 4155 offset = 0; 4156 if (offset == limit) { 4157 if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) { 4158 SCTP_STAT_INCR(sctps_pdrpbwrpt); 4159 } 4160 } else if (offset + sizeof(struct sctphdr) > limit) { 4161 /* Only a partial SCTP common header. */ 4162 SCTP_STAT_INCR(sctps_pdrpcrupt); 4163 offset = limit; 4164 } else { 4165 /* XXX: Check embedded SCTP common header. */ 4166 offset += sizeof(struct sctphdr); 4167 } 4168 /* Now parse through the chunks themselves. */ 4169 while (offset < limit) { 4170 if (offset + sizeof(struct sctp_chunkhdr) > limit) { 4171 SCTP_STAT_INCR(sctps_pdrpcrupt); 4172 break; 4173 } 4174 chk_hdr = (struct sctp_chunkhdr *)(cp->data + offset); 4175 desc.chunk_type = chk_hdr->chunk_type; 4176 /* get amount we need to move */ 4177 chk_len = (uint32_t)ntohs(chk_hdr->chunk_length); 4178 if (chk_len < sizeof(struct sctp_chunkhdr)) { 4179 /* Someone is lying... */ 4180 break; 4181 } 4182 if (desc.chunk_type == SCTP_DATA) { 4183 if (stcb->asoc.idata_supported) { 4184 /* Some is playing games with us. */ 4185 break; 4186 } 4187 if (chk_len <= sizeof(struct sctp_data_chunk)) { 4188 /* Some is playing games with us. */ 4189 break; 4190 } 4191 if (chk_len < sizeof(struct sctp_data_chunk) + SCTP_NUM_DB_TO_VERIFY) { 4192 /* 4193 * Not enough data bytes available in the 4194 * chunk. 4195 */ 4196 SCTP_STAT_INCR(sctps_pdrpnedat); 4197 goto next_chunk; 4198 } 4199 if (offset + sizeof(struct sctp_data_chunk) + SCTP_NUM_DB_TO_VERIFY > limit) { 4200 /* Not enough data in buffer. */ 4201 break; 4202 } 4203 data_chunk = (struct sctp_data_chunk *)(cp->data + offset); 4204 memcpy(desc.data_bytes, data_chunk + 1, SCTP_NUM_DB_TO_VERIFY); 4205 desc.tsn_ifany = data_chunk->dp.tsn; 4206 if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) { 4207 SCTP_STAT_INCR(sctps_pdrpmbda); 4208 } 4209 } else if (desc.chunk_type == SCTP_IDATA) { 4210 if (!stcb->asoc.idata_supported) { 4211 /* Some is playing games with us. */ 4212 break; 4213 } 4214 if (chk_len <= sizeof(struct sctp_idata_chunk)) { 4215 /* Some is playing games with us. */ 4216 break; 4217 } 4218 if (chk_len < sizeof(struct sctp_idata_chunk) + SCTP_NUM_DB_TO_VERIFY) { 4219 /* 4220 * Not enough data bytes available in the 4221 * chunk. 4222 */ 4223 SCTP_STAT_INCR(sctps_pdrpnedat); 4224 goto next_chunk; 4225 } 4226 if (offset + sizeof(struct sctp_idata_chunk) + SCTP_NUM_DB_TO_VERIFY > limit) { 4227 /* Not enough data in buffer. */ 4228 break; 4229 } 4230 idata_chunk = (struct sctp_idata_chunk *)(cp->data + offset); 4231 memcpy(desc.data_bytes, idata_chunk + 1, SCTP_NUM_DB_TO_VERIFY); 4232 desc.tsn_ifany = idata_chunk->dp.tsn; 4233 if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) { 4234 SCTP_STAT_INCR(sctps_pdrpmbda); 4235 } 4236 } else { 4237 if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) { 4238 SCTP_STAT_INCR(sctps_pdrpmbct); 4239 } 4240 } 4241 if (process_chunk_drop(stcb, &desc, net, pktdrp_flags)) { 4242 SCTP_STAT_INCR(sctps_pdrppdbrk); 4243 break; 4244 } 4245 next_chunk: 4246 offset += SCTP_SIZE32(chk_len); 4247 } 4248 /* Now update any rwnd --- possibly */ 4249 if ((pktdrp_flags & SCTP_FROM_MIDDLE_BOX) == 0) { 4250 /* From a peer, we get a rwnd report */ 4251 uint32_t a_rwnd; 4252 4253 SCTP_STAT_INCR(sctps_pdrpfehos); 4254 4255 bottle_bw = ntohl(cp->bottle_bw); 4256 on_queue = ntohl(cp->current_onq); 4257 if (bottle_bw && on_queue) { 4258 /* a rwnd report is in here */ 4259 if (bottle_bw > on_queue) 4260 a_rwnd = bottle_bw - on_queue; 4261 else 4262 a_rwnd = 0; 4263 4264 if (a_rwnd == 0) 4265 stcb->asoc.peers_rwnd = 0; 4266 else { 4267 if (a_rwnd > stcb->asoc.total_flight) { 4268 stcb->asoc.peers_rwnd = 4269 a_rwnd - stcb->asoc.total_flight; 4270 } else { 4271 stcb->asoc.peers_rwnd = 0; 4272 } 4273 if (stcb->asoc.peers_rwnd < 4274 stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 4275 /* SWS sender side engages */ 4276 stcb->asoc.peers_rwnd = 0; 4277 } 4278 } 4279 } 4280 } else { 4281 SCTP_STAT_INCR(sctps_pdrpfmbox); 4282 } 4283 4284 /* now middle boxes in sat networks get a cwnd bump */ 4285 if ((pktdrp_flags & SCTP_FROM_MIDDLE_BOX) && 4286 (stcb->asoc.sat_t3_loss_recovery == 0) && 4287 (stcb->asoc.sat_network)) { 4288 /* 4289 * This is debatable but for sat networks it makes sense 4290 * Note if a T3 timer has went off, we will prohibit any 4291 * changes to cwnd until we exit the t3 loss recovery. 4292 */ 4293 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb, 4294 net, cp, &bottle_bw, &on_queue); 4295 } 4296 } 4297 4298 /* 4299 * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to 4300 * still contain IP/SCTP header - stcb: is the tcb found for this packet - 4301 * offset: offset into the mbuf chain to first chunkhdr - length: is the 4302 * length of the complete packet outputs: - length: modified to remaining 4303 * length after control processing - netp: modified to new sctp_nets after 4304 * cookie-echo processing - return NULL to discard the packet (ie. no asoc, 4305 * bad packet,...) otherwise return the tcb for this packet 4306 */ 4307 #ifdef __GNUC__ 4308 __attribute__((noinline)) 4309 #endif 4310 static struct sctp_tcb * 4311 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length, 4312 struct sockaddr *src, struct sockaddr *dst, 4313 struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp, 4314 struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen, 4315 uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum, 4316 uint32_t vrf_id, uint16_t port) 4317 { 4318 struct sctp_association *asoc; 4319 struct mbuf *op_err; 4320 char msg[SCTP_DIAG_INFO_LEN]; 4321 uint32_t vtag_in; 4322 int num_chunks = 0; /* number of control chunks processed */ 4323 uint32_t chk_length, contiguous; 4324 int ret; 4325 int abort_no_unlock = 0; 4326 int ecne_seen = 0; 4327 int abort_flag; 4328 4329 /* 4330 * How big should this be, and should it be alloc'd? Lets try the 4331 * d-mtu-ceiling for now (2k) and that should hopefully work ... 4332 * until we get into jumbo grams and such.. 4333 */ 4334 uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE]; 4335 int got_auth = 0; 4336 uint32_t auth_offset = 0, auth_len = 0; 4337 int auth_skipped = 0; 4338 int asconf_cnt = 0; 4339 4340 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n", 4341 iphlen, *offset, length, (void *)stcb); 4342 4343 if (stcb) { 4344 SCTP_TCB_LOCK_ASSERT(stcb); 4345 } 4346 /* validate chunk header length... */ 4347 if (ntohs(ch->chunk_length) < sizeof(*ch)) { 4348 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n", 4349 ntohs(ch->chunk_length)); 4350 *offset = length; 4351 return (stcb); 4352 } 4353 /* 4354 * validate the verification tag 4355 */ 4356 vtag_in = ntohl(sh->v_tag); 4357 4358 if (ch->chunk_type == SCTP_INITIATION) { 4359 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n", 4360 ntohs(ch->chunk_length), vtag_in); 4361 if (vtag_in != 0) { 4362 /* protocol error- silently discard... */ 4363 SCTP_STAT_INCR(sctps_badvtag); 4364 if (stcb != NULL) { 4365 SCTP_TCB_UNLOCK(stcb); 4366 } 4367 return (NULL); 4368 } 4369 } else if (ch->chunk_type != SCTP_COOKIE_ECHO) { 4370 /* 4371 * If there is no stcb, skip the AUTH chunk and process 4372 * later after a stcb is found (to validate the lookup was 4373 * valid. 4374 */ 4375 if ((ch->chunk_type == SCTP_AUTHENTICATION) && 4376 (stcb == NULL) && 4377 (inp->auth_supported == 1)) { 4378 /* save this chunk for later processing */ 4379 auth_skipped = 1; 4380 auth_offset = *offset; 4381 auth_len = ntohs(ch->chunk_length); 4382 4383 /* (temporarily) move past this chunk */ 4384 *offset += SCTP_SIZE32(auth_len); 4385 if (*offset >= length) { 4386 /* no more data left in the mbuf chain */ 4387 *offset = length; 4388 return (NULL); 4389 } 4390 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4391 sizeof(struct sctp_chunkhdr), chunk_buf); 4392 } 4393 if (ch == NULL) { 4394 /* Help */ 4395 *offset = length; 4396 return (stcb); 4397 } 4398 if (ch->chunk_type == SCTP_COOKIE_ECHO) { 4399 goto process_control_chunks; 4400 } 4401 /* 4402 * first check if it's an ASCONF with an unknown src addr we 4403 * need to look inside to find the association 4404 */ 4405 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) { 4406 struct sctp_chunkhdr *asconf_ch = ch; 4407 uint32_t asconf_offset = 0, asconf_len = 0; 4408 4409 /* inp's refcount may be reduced */ 4410 SCTP_INP_INCR_REF(inp); 4411 4412 asconf_offset = *offset; 4413 do { 4414 asconf_len = ntohs(asconf_ch->chunk_length); 4415 if (asconf_len < sizeof(struct sctp_asconf_paramhdr)) 4416 break; 4417 stcb = sctp_findassociation_ep_asconf(m, 4418 *offset, 4419 dst, 4420 sh, &inp, netp, vrf_id); 4421 if (stcb != NULL) 4422 break; 4423 asconf_offset += SCTP_SIZE32(asconf_len); 4424 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset, 4425 sizeof(struct sctp_chunkhdr), chunk_buf); 4426 } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF); 4427 if (stcb == NULL) { 4428 /* 4429 * reduce inp's refcount if not reduced in 4430 * sctp_findassociation_ep_asconf(). 4431 */ 4432 SCTP_INP_DECR_REF(inp); 4433 } 4434 4435 /* now go back and verify any auth chunk to be sure */ 4436 if (auth_skipped && (stcb != NULL)) { 4437 struct sctp_auth_chunk *auth; 4438 4439 if (auth_len <= SCTP_CHUNK_BUFFER_SIZE) { 4440 auth = (struct sctp_auth_chunk *)sctp_m_getptr(m, auth_offset, auth_len, chunk_buf); 4441 got_auth = 1; 4442 auth_skipped = 0; 4443 } else { 4444 auth = NULL; 4445 } 4446 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, 4447 auth_offset)) { 4448 /* auth HMAC failed so dump it */ 4449 *offset = length; 4450 return (stcb); 4451 } else { 4452 /* remaining chunks are HMAC checked */ 4453 stcb->asoc.authenticated = 1; 4454 } 4455 } 4456 } 4457 if (stcb == NULL) { 4458 SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 4459 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4460 msg); 4461 /* no association, so it's out of the blue... */ 4462 sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, op_err, 4463 mflowtype, mflowid, inp->fibnum, 4464 vrf_id, port); 4465 *offset = length; 4466 return (NULL); 4467 } 4468 asoc = &stcb->asoc; 4469 /* ABORT and SHUTDOWN can use either v_tag... */ 4470 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) || 4471 (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) || 4472 (ch->chunk_type == SCTP_PACKET_DROPPED)) { 4473 /* Take the T-bit always into account. */ 4474 if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) && 4475 (vtag_in == asoc->my_vtag)) || 4476 (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) && 4477 (asoc->peer_vtag != htonl(0)) && 4478 (vtag_in == asoc->peer_vtag))) { 4479 /* this is valid */ 4480 } else { 4481 /* drop this packet... */ 4482 SCTP_STAT_INCR(sctps_badvtag); 4483 if (stcb != NULL) { 4484 SCTP_TCB_UNLOCK(stcb); 4485 } 4486 return (NULL); 4487 } 4488 } else { 4489 /* for all other chunks, vtag must match */ 4490 if (vtag_in != asoc->my_vtag) { 4491 /* invalid vtag... */ 4492 SCTPDBG(SCTP_DEBUG_INPUT3, 4493 "invalid vtag: %xh, expect %xh\n", 4494 vtag_in, asoc->my_vtag); 4495 SCTP_STAT_INCR(sctps_badvtag); 4496 if (stcb != NULL) { 4497 SCTP_TCB_UNLOCK(stcb); 4498 } 4499 *offset = length; 4500 return (NULL); 4501 } 4502 } 4503 } /* end if !SCTP_COOKIE_ECHO */ 4504 /* 4505 * process all control chunks... 4506 */ 4507 if (((ch->chunk_type == SCTP_SELECTIVE_ACK) || 4508 (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) || 4509 (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) && 4510 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 4511 /* implied cookie-ack.. we must have lost the ack */ 4512 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, 4513 *netp); 4514 } 4515 4516 process_control_chunks: 4517 while (IS_SCTP_CONTROL(ch)) { 4518 /* validate chunk length */ 4519 chk_length = ntohs(ch->chunk_length); 4520 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n", 4521 ch->chunk_type, chk_length); 4522 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length); 4523 if (chk_length < sizeof(*ch) || 4524 (*offset + (int)chk_length) > length) { 4525 *offset = length; 4526 return (stcb); 4527 } 4528 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks); 4529 /* 4530 * INIT and INIT-ACK only gets the init ack "header" portion 4531 * only because we don't have to process the peer's COOKIE. 4532 * All others get a complete chunk. 4533 */ 4534 switch (ch->chunk_type) { 4535 case SCTP_INITIATION: 4536 contiguous = sizeof(struct sctp_init_chunk); 4537 break; 4538 case SCTP_INITIATION_ACK: 4539 contiguous = sizeof(struct sctp_init_ack_chunk); 4540 break; 4541 default: 4542 contiguous = min(chk_length, sizeof(chunk_buf)); 4543 break; 4544 } 4545 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4546 contiguous, 4547 chunk_buf); 4548 if (ch == NULL) { 4549 *offset = length; 4550 return (stcb); 4551 } 4552 4553 num_chunks++; 4554 /* Save off the last place we got a control from */ 4555 if (stcb != NULL) { 4556 if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) { 4557 /* 4558 * allow last_control to be NULL if 4559 * ASCONF... ASCONF processing will find the 4560 * right net later 4561 */ 4562 if ((netp != NULL) && (*netp != NULL)) 4563 stcb->asoc.last_control_chunk_from = *netp; 4564 } 4565 } 4566 #ifdef SCTP_AUDITING_ENABLED 4567 sctp_audit_log(0xB0, ch->chunk_type); 4568 #endif 4569 4570 /* check to see if this chunk required auth, but isn't */ 4571 if ((stcb != NULL) && 4572 sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) && 4573 !stcb->asoc.authenticated) { 4574 /* "silently" ignore */ 4575 SCTP_STAT_INCR(sctps_recvauthmissing); 4576 goto next_chunk; 4577 } 4578 switch (ch->chunk_type) { 4579 case SCTP_INITIATION: 4580 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n"); 4581 /* The INIT chunk must be the only chunk. */ 4582 if ((num_chunks > 1) || 4583 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4584 /* 4585 * RFC 4960bis requires stopping the 4586 * processing of the packet. 4587 */ 4588 *offset = length; 4589 return (stcb); 4590 } 4591 /* Honor our resource limit. */ 4592 if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) { 4593 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 4594 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err, 4595 mflowtype, mflowid, inp->fibnum, 4596 vrf_id, port); 4597 *offset = length; 4598 if (stcb != NULL) { 4599 SCTP_TCB_UNLOCK(stcb); 4600 } 4601 return (NULL); 4602 } 4603 sctp_handle_init(m, iphlen, *offset, src, dst, sh, 4604 (struct sctp_init_chunk *)ch, inp, 4605 stcb, *netp, 4606 mflowtype, mflowid, 4607 vrf_id, port); 4608 *offset = length; 4609 if (stcb != NULL) { 4610 SCTP_TCB_UNLOCK(stcb); 4611 } 4612 return (NULL); 4613 break; 4614 case SCTP_PAD_CHUNK: 4615 break; 4616 case SCTP_INITIATION_ACK: 4617 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT_ACK\n"); 4618 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4619 /* We are not interested anymore */ 4620 if ((stcb != NULL) && (stcb->asoc.total_output_queue_size)) { 4621 ; 4622 } else { 4623 *offset = length; 4624 if (stcb != NULL) { 4625 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 4626 SCTP_FROM_SCTP_INPUT + SCTP_LOC_29); 4627 } 4628 return (NULL); 4629 } 4630 } 4631 /* The INIT-ACK chunk must be the only chunk. */ 4632 if ((num_chunks > 1) || 4633 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4634 *offset = length; 4635 return (stcb); 4636 } 4637 if ((netp != NULL) && (*netp != NULL)) { 4638 ret = sctp_handle_init_ack(m, iphlen, *offset, 4639 src, dst, sh, 4640 (struct sctp_init_ack_chunk *)ch, 4641 stcb, *netp, 4642 &abort_no_unlock, 4643 mflowtype, mflowid, 4644 vrf_id); 4645 } else { 4646 ret = -1; 4647 } 4648 *offset = length; 4649 if (abort_no_unlock) { 4650 return (NULL); 4651 } 4652 /* 4653 * Special case, I must call the output routine to 4654 * get the cookie echoed 4655 */ 4656 if ((stcb != NULL) && (ret == 0)) { 4657 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 4658 } 4659 return (stcb); 4660 break; 4661 case SCTP_SELECTIVE_ACK: 4662 case SCTP_NR_SELECTIVE_ACK: 4663 { 4664 int abort_now = 0; 4665 uint32_t a_rwnd, cum_ack; 4666 uint16_t num_seg, num_nr_seg, num_dup; 4667 uint8_t flags; 4668 int offset_seg, offset_dup; 4669 4670 SCTPDBG(SCTP_DEBUG_INPUT3, "%s\n", 4671 ch->chunk_type == SCTP_SELECTIVE_ACK ? "SCTP_SACK" : "SCTP_NR_SACK"); 4672 SCTP_STAT_INCR(sctps_recvsacks); 4673 if (stcb == NULL) { 4674 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing %s chunk\n", 4675 (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK"); 4676 break; 4677 } 4678 if (ch->chunk_type == SCTP_SELECTIVE_ACK) { 4679 if (chk_length < sizeof(struct sctp_sack_chunk)) { 4680 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n"); 4681 break; 4682 } 4683 } else { 4684 if (stcb->asoc.nrsack_supported == 0) { 4685 goto unknown_chunk; 4686 } 4687 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) { 4688 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR_SACK chunk, too small\n"); 4689 break; 4690 } 4691 } 4692 if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4693 /*- 4694 * If we have sent a shutdown-ack, we will pay no 4695 * attention to a sack sent in to us since 4696 * we don't care anymore. 4697 */ 4698 break; 4699 } 4700 flags = ch->chunk_flags; 4701 if (ch->chunk_type == SCTP_SELECTIVE_ACK) { 4702 struct sctp_sack_chunk *sack; 4703 4704 sack = (struct sctp_sack_chunk *)ch; 4705 cum_ack = ntohl(sack->sack.cum_tsn_ack); 4706 num_seg = ntohs(sack->sack.num_gap_ack_blks); 4707 num_nr_seg = 0; 4708 num_dup = ntohs(sack->sack.num_dup_tsns); 4709 a_rwnd = ntohl(sack->sack.a_rwnd); 4710 if (sizeof(struct sctp_sack_chunk) + 4711 num_seg * sizeof(struct sctp_gap_ack_block) + 4712 num_dup * sizeof(uint32_t) != chk_length) { 4713 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n"); 4714 break; 4715 } 4716 offset_seg = *offset + sizeof(struct sctp_sack_chunk); 4717 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 4718 } else { 4719 struct sctp_nr_sack_chunk *nr_sack; 4720 4721 nr_sack = (struct sctp_nr_sack_chunk *)ch; 4722 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack); 4723 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks); 4724 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks); 4725 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns); 4726 a_rwnd = ntohl(nr_sack->nr_sack.a_rwnd); 4727 if (sizeof(struct sctp_nr_sack_chunk) + 4728 (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) + 4729 num_dup * sizeof(uint32_t) != chk_length) { 4730 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n"); 4731 break; 4732 } 4733 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk); 4734 offset_dup = offset_seg + (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block); 4735 } 4736 SCTPDBG(SCTP_DEBUG_INPUT3, "%s process cum_ack:%x num_seg:%d a_rwnd:%d\n", 4737 (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK", 4738 cum_ack, num_seg, a_rwnd); 4739 stcb->asoc.seen_a_sack_this_pkt = 1; 4740 if ((stcb->asoc.pr_sctp_cnt == 0) && 4741 (num_seg == 0) && (num_nr_seg == 0) && 4742 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 4743 (stcb->asoc.saw_sack_with_frags == 0) && 4744 (stcb->asoc.saw_sack_with_nr_frags == 0) && 4745 (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) { 4746 /* 4747 * We have a SIMPLE sack having no 4748 * prior segments and data on sent 4749 * queue to be acked. Use the faster 4750 * path sack processing. We also 4751 * allow window update sacks with no 4752 * missing segments to go this way 4753 * too. 4754 */ 4755 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, 4756 &abort_now, ecne_seen); 4757 } else { 4758 if ((netp != NULL) && (*netp != NULL)) { 4759 sctp_handle_sack(m, offset_seg, offset_dup, stcb, 4760 num_seg, num_nr_seg, num_dup, &abort_now, flags, 4761 cum_ack, a_rwnd, ecne_seen); 4762 } 4763 } 4764 if (abort_now) { 4765 /* ABORT signal from sack processing */ 4766 *offset = length; 4767 return (NULL); 4768 } 4769 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 4770 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 4771 (stcb->asoc.stream_queue_cnt == 0)) { 4772 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 4773 } 4774 break; 4775 } 4776 case SCTP_HEARTBEAT_REQUEST: 4777 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n"); 4778 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 4779 SCTP_STAT_INCR(sctps_recvheartbeat); 4780 sctp_send_heartbeat_ack(stcb, m, *offset, 4781 chk_length, *netp); 4782 } 4783 break; 4784 case SCTP_HEARTBEAT_ACK: 4785 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT_ACK\n"); 4786 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) { 4787 /* Its not ours */ 4788 break; 4789 } 4790 SCTP_STAT_INCR(sctps_recvheartbeatack); 4791 if ((netp != NULL) && (*netp != NULL)) { 4792 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch, 4793 stcb, *netp); 4794 } 4795 break; 4796 case SCTP_ABORT_ASSOCIATION: 4797 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n", 4798 (void *)stcb); 4799 *offset = length; 4800 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 4801 if (sctp_handle_abort((struct sctp_abort_chunk *)ch, stcb, *netp)) { 4802 return (NULL); 4803 } else { 4804 return (stcb); 4805 } 4806 } else { 4807 return (NULL); 4808 } 4809 break; 4810 case SCTP_SHUTDOWN: 4811 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n", 4812 (void *)stcb); 4813 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) { 4814 break; 4815 } 4816 if ((netp != NULL) && (*netp != NULL)) { 4817 abort_flag = 0; 4818 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch, 4819 stcb, *netp, &abort_flag); 4820 if (abort_flag) { 4821 *offset = length; 4822 return (NULL); 4823 } 4824 } 4825 break; 4826 case SCTP_SHUTDOWN_ACK: 4827 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_ACK, stcb %p\n", (void *)stcb); 4828 if ((chk_length == sizeof(struct sctp_shutdown_ack_chunk)) && 4829 (stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 4830 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp); 4831 *offset = length; 4832 return (NULL); 4833 } 4834 break; 4835 case SCTP_OPERATION_ERROR: 4836 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP_ERR\n"); 4837 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL) && 4838 sctp_handle_error(ch, stcb, *netp, contiguous) < 0) { 4839 *offset = length; 4840 return (NULL); 4841 } 4842 break; 4843 case SCTP_COOKIE_ECHO: 4844 SCTPDBG(SCTP_DEBUG_INPUT3, 4845 "SCTP_COOKIE_ECHO, stcb %p\n", (void *)stcb); 4846 if ((stcb != NULL) && (stcb->asoc.total_output_queue_size > 0)) { 4847 ; 4848 } else { 4849 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4850 /* We are not interested anymore */ 4851 abend: 4852 if (stcb != NULL) { 4853 SCTP_TCB_UNLOCK(stcb); 4854 } 4855 *offset = length; 4856 return (NULL); 4857 } 4858 } 4859 /*- 4860 * First are we accepting? We do this again here 4861 * since it is possible that a previous endpoint WAS 4862 * listening responded to a INIT-ACK and then 4863 * closed. We opened and bound.. and are now no 4864 * longer listening. 4865 * 4866 * XXXGL: notes on checking listen queue length. 4867 * 1) SCTP_IS_LISTENING() doesn't necessarily mean 4868 * SOLISTENING(), because a listening "UDP type" 4869 * socket isn't listening in terms of the socket 4870 * layer. It is a normal data flow socket, that 4871 * can fork off new connections. Thus, we should 4872 * look into sol_qlen only in case we are !UDP. 4873 * 2) Checking sol_qlen in general requires locking 4874 * the socket, and this code lacks that. 4875 */ 4876 if ((stcb == NULL) && 4877 (!SCTP_IS_LISTENING(inp) || 4878 (!(inp->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE) && 4879 inp->sctp_socket->sol_qlen >= inp->sctp_socket->sol_qlimit))) { 4880 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 4881 (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) { 4882 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 4883 sctp_abort_association(inp, stcb, m, iphlen, 4884 src, dst, sh, op_err, 4885 mflowtype, mflowid, 4886 vrf_id, port); 4887 } 4888 *offset = length; 4889 return (NULL); 4890 } else { 4891 struct mbuf *ret_buf; 4892 struct sctp_inpcb *linp; 4893 struct sctp_tmit_chunk *chk; 4894 4895 if (inp->sctp_flags & (SCTP_PCB_FLAGS_SOCKET_GONE | 4896 SCTP_PCB_FLAGS_SOCKET_ALLGONE)) { 4897 goto abend; 4898 } 4899 4900 if (stcb) { 4901 linp = NULL; 4902 } else { 4903 linp = inp; 4904 } 4905 4906 if (linp != NULL) { 4907 SCTP_ASOC_CREATE_LOCK(linp); 4908 } 4909 4910 if (netp != NULL) { 4911 struct sctp_tcb *locked_stcb; 4912 4913 locked_stcb = stcb; 4914 ret_buf = 4915 sctp_handle_cookie_echo(m, iphlen, 4916 *offset, 4917 src, dst, 4918 sh, 4919 (struct sctp_cookie_echo_chunk *)ch, 4920 &inp, &stcb, netp, 4921 auth_skipped, 4922 auth_offset, 4923 auth_len, 4924 &locked_stcb, 4925 mflowtype, 4926 mflowid, 4927 vrf_id, 4928 port); 4929 if ((locked_stcb != NULL) && (locked_stcb != stcb)) { 4930 SCTP_TCB_UNLOCK(locked_stcb); 4931 } 4932 if (stcb != NULL) { 4933 SCTP_TCB_LOCK_ASSERT(stcb); 4934 } 4935 } else { 4936 ret_buf = NULL; 4937 } 4938 if (linp != NULL) { 4939 SCTP_ASOC_CREATE_UNLOCK(linp); 4940 } 4941 if (ret_buf == NULL) { 4942 if (stcb != NULL) { 4943 SCTP_TCB_UNLOCK(stcb); 4944 } 4945 SCTPDBG(SCTP_DEBUG_INPUT3, 4946 "GAK, null buffer\n"); 4947 *offset = length; 4948 return (NULL); 4949 } 4950 /* if AUTH skipped, see if it verified... */ 4951 if (auth_skipped) { 4952 got_auth = 1; 4953 auth_skipped = 0; 4954 } 4955 /* Restart the timer if we have pending data */ 4956 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 4957 if (chk->whoTo != NULL) { 4958 break; 4959 } 4960 } 4961 if (chk != NULL) { 4962 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 4963 } 4964 } 4965 break; 4966 case SCTP_COOKIE_ACK: 4967 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE_ACK, stcb %p\n", (void *)stcb); 4968 if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) { 4969 break; 4970 } 4971 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4972 /* We are not interested anymore */ 4973 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4974 ; 4975 } else if (stcb) { 4976 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 4977 SCTP_FROM_SCTP_INPUT + SCTP_LOC_30); 4978 *offset = length; 4979 return (NULL); 4980 } 4981 } 4982 if ((netp != NULL) && (*netp != NULL)) { 4983 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp); 4984 } 4985 break; 4986 case SCTP_ECN_ECHO: 4987 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_ECHO\n"); 4988 if (stcb == NULL) { 4989 break; 4990 } 4991 if (stcb->asoc.ecn_supported == 0) { 4992 goto unknown_chunk; 4993 } 4994 if ((chk_length != sizeof(struct sctp_ecne_chunk)) && 4995 (chk_length != sizeof(struct old_sctp_ecne_chunk))) { 4996 break; 4997 } 4998 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, stcb); 4999 ecne_seen = 1; 5000 break; 5001 case SCTP_ECN_CWR: 5002 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_CWR\n"); 5003 if (stcb == NULL) { 5004 break; 5005 } 5006 if (stcb->asoc.ecn_supported == 0) { 5007 goto unknown_chunk; 5008 } 5009 if (chk_length != sizeof(struct sctp_cwr_chunk)) { 5010 break; 5011 } 5012 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp); 5013 break; 5014 case SCTP_SHUTDOWN_COMPLETE: 5015 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_COMPLETE, stcb %p\n", (void *)stcb); 5016 /* must be first and only chunk */ 5017 if ((num_chunks > 1) || 5018 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 5019 *offset = length; 5020 return (stcb); 5021 } 5022 if ((chk_length == sizeof(struct sctp_shutdown_complete_chunk)) && 5023 (stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 5024 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch, 5025 stcb, *netp); 5026 *offset = length; 5027 return (NULL); 5028 } 5029 break; 5030 case SCTP_ASCONF: 5031 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n"); 5032 if (stcb != NULL) { 5033 if (stcb->asoc.asconf_supported == 0) { 5034 goto unknown_chunk; 5035 } 5036 sctp_handle_asconf(m, *offset, src, 5037 (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0); 5038 asconf_cnt++; 5039 } 5040 break; 5041 case SCTP_ASCONF_ACK: 5042 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF_ACK\n"); 5043 if (stcb == NULL) { 5044 break; 5045 } 5046 if (stcb->asoc.asconf_supported == 0) { 5047 goto unknown_chunk; 5048 } 5049 if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) { 5050 break; 5051 } 5052 if ((netp != NULL) && (*netp != NULL)) { 5053 /* He's alive so give him credit */ 5054 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5055 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5056 stcb->asoc.overall_error_count, 5057 0, 5058 SCTP_FROM_SCTP_INPUT, 5059 __LINE__); 5060 } 5061 stcb->asoc.overall_error_count = 0; 5062 sctp_handle_asconf_ack(m, *offset, 5063 (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock); 5064 if (abort_no_unlock) 5065 return (NULL); 5066 } 5067 break; 5068 case SCTP_FORWARD_CUM_TSN: 5069 case SCTP_IFORWARD_CUM_TSN: 5070 SCTPDBG(SCTP_DEBUG_INPUT3, "%s\n", 5071 ch->chunk_type == SCTP_FORWARD_CUM_TSN ? "FORWARD_TSN" : "I_FORWARD_TSN"); 5072 if (stcb == NULL) { 5073 break; 5074 } 5075 if (stcb->asoc.prsctp_supported == 0) { 5076 goto unknown_chunk; 5077 } 5078 if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) { 5079 break; 5080 } 5081 if (((stcb->asoc.idata_supported == 1) && (ch->chunk_type == SCTP_FORWARD_CUM_TSN)) || 5082 ((stcb->asoc.idata_supported == 0) && (ch->chunk_type == SCTP_IFORWARD_CUM_TSN))) { 5083 if (ch->chunk_type == SCTP_FORWARD_CUM_TSN) { 5084 SCTP_SNPRINTF(msg, sizeof(msg), "%s", "FORWARD-TSN chunk received when I-FORWARD-TSN was negotiated"); 5085 } else { 5086 SCTP_SNPRINTF(msg, sizeof(msg), "%s", "I-FORWARD-TSN chunk received when FORWARD-TSN was negotiated"); 5087 } 5088 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); 5089 sctp_abort_an_association(inp, stcb, op_err, false, SCTP_SO_NOT_LOCKED); 5090 *offset = length; 5091 return (NULL); 5092 } 5093 *fwd_tsn_seen = 1; 5094 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5095 /* We are not interested anymore */ 5096 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 5097 SCTP_FROM_SCTP_INPUT + SCTP_LOC_31); 5098 *offset = length; 5099 return (NULL); 5100 } 5101 /* 5102 * For sending a SACK this looks like DATA chunks. 5103 */ 5104 stcb->asoc.last_data_chunk_from = stcb->asoc.last_control_chunk_from; 5105 abort_flag = 0; 5106 sctp_handle_forward_tsn(stcb, 5107 (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset); 5108 if (abort_flag) { 5109 *offset = length; 5110 return (NULL); 5111 } 5112 break; 5113 case SCTP_STREAM_RESET: 5114 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n"); 5115 if (stcb == NULL) { 5116 break; 5117 } 5118 if (stcb->asoc.reconfig_supported == 0) { 5119 goto unknown_chunk; 5120 } 5121 if (chk_length < sizeof(struct sctp_stream_reset_tsn_req)) { 5122 break; 5123 } 5124 if (sctp_handle_stream_reset(stcb, m, *offset, ch)) { 5125 /* stop processing */ 5126 *offset = length; 5127 return (NULL); 5128 } 5129 break; 5130 case SCTP_PACKET_DROPPED: 5131 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n"); 5132 if (stcb == NULL) { 5133 break; 5134 } 5135 if (stcb->asoc.pktdrop_supported == 0) { 5136 goto unknown_chunk; 5137 } 5138 if (chk_length < sizeof(struct sctp_pktdrop_chunk)) { 5139 break; 5140 } 5141 if ((netp != NULL) && (*netp != NULL)) { 5142 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch, 5143 stcb, *netp, 5144 min(chk_length, contiguous)); 5145 } 5146 break; 5147 case SCTP_AUTHENTICATION: 5148 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n"); 5149 if (stcb == NULL) { 5150 /* save the first AUTH for later processing */ 5151 if (auth_skipped == 0) { 5152 auth_offset = *offset; 5153 auth_len = chk_length; 5154 auth_skipped = 1; 5155 } 5156 /* skip this chunk (temporarily) */ 5157 break; 5158 } 5159 if (stcb->asoc.auth_supported == 0) { 5160 goto unknown_chunk; 5161 } 5162 if ((chk_length < (sizeof(struct sctp_auth_chunk))) || 5163 (chk_length > (sizeof(struct sctp_auth_chunk) + 5164 SCTP_AUTH_DIGEST_LEN_MAX))) { 5165 /* Its not ours */ 5166 *offset = length; 5167 return (stcb); 5168 } 5169 if (got_auth == 1) { 5170 /* skip this chunk... it's already auth'd */ 5171 break; 5172 } 5173 got_auth = 1; 5174 if (sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch, m, *offset)) { 5175 /* auth HMAC failed so dump the packet */ 5176 *offset = length; 5177 return (stcb); 5178 } else { 5179 /* remaining chunks are HMAC checked */ 5180 stcb->asoc.authenticated = 1; 5181 } 5182 break; 5183 5184 default: 5185 unknown_chunk: 5186 /* it's an unknown chunk! */ 5187 if ((ch->chunk_type & 0x40) && 5188 (stcb != NULL) && 5189 (SCTP_GET_STATE(stcb) != SCTP_STATE_EMPTY) && 5190 (SCTP_GET_STATE(stcb) != SCTP_STATE_INUSE) && 5191 (SCTP_GET_STATE(stcb) != SCTP_STATE_COOKIE_WAIT)) { 5192 struct sctp_gen_error_cause *cause; 5193 int len; 5194 5195 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_gen_error_cause), 5196 0, M_NOWAIT, 1, MT_DATA); 5197 if (op_err != NULL) { 5198 len = min(SCTP_SIZE32(chk_length), (uint32_t)(length - *offset)); 5199 cause = mtod(op_err, struct sctp_gen_error_cause *); 5200 cause->code = htons(SCTP_CAUSE_UNRECOG_CHUNK); 5201 cause->length = htons((uint16_t)(len + sizeof(struct sctp_gen_error_cause))); 5202 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_gen_error_cause); 5203 SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(m, *offset, len, M_NOWAIT); 5204 if (SCTP_BUF_NEXT(op_err) != NULL) { 5205 #ifdef SCTP_MBUF_LOGGING 5206 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5207 sctp_log_mbc(SCTP_BUF_NEXT(op_err), SCTP_MBUF_ICOPY); 5208 } 5209 #endif 5210 sctp_queue_op_err(stcb, op_err); 5211 } else { 5212 sctp_m_freem(op_err); 5213 } 5214 } 5215 } 5216 if ((ch->chunk_type & 0x80) == 0) { 5217 /* discard this packet */ 5218 *offset = length; 5219 return (stcb); 5220 } /* else skip this bad chunk and continue... */ 5221 break; 5222 } /* switch (ch->chunk_type) */ 5223 5224 next_chunk: 5225 /* get the next chunk */ 5226 *offset += SCTP_SIZE32(chk_length); 5227 if (*offset >= length) { 5228 /* no more data left in the mbuf chain */ 5229 break; 5230 } 5231 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 5232 sizeof(struct sctp_chunkhdr), chunk_buf); 5233 if (ch == NULL) { 5234 *offset = length; 5235 return (stcb); 5236 } 5237 } /* while */ 5238 5239 if ((asconf_cnt > 0) && (stcb != NULL)) { 5240 sctp_send_asconf_ack(stcb); 5241 } 5242 return (stcb); 5243 } 5244 5245 /* 5246 * common input chunk processing (v4 and v6) 5247 */ 5248 void 5249 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length, 5250 struct sockaddr *src, struct sockaddr *dst, 5251 struct sctphdr *sh, struct sctp_chunkhdr *ch, 5252 uint8_t compute_crc, 5253 uint8_t ecn_bits, 5254 uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum, 5255 uint32_t vrf_id, uint16_t port) 5256 { 5257 uint32_t high_tsn; 5258 int fwd_tsn_seen = 0, data_processed = 0; 5259 struct mbuf *m = *mm, *op_err; 5260 char msg[SCTP_DIAG_INFO_LEN]; 5261 int un_sent; 5262 int cnt_ctrl_ready = 0; 5263 struct sctp_inpcb *inp = NULL, *inp_decr = NULL; 5264 struct sctp_tcb *stcb = NULL; 5265 struct sctp_nets *net = NULL; 5266 5267 SCTP_STAT_INCR(sctps_recvdatagrams); 5268 #ifdef SCTP_AUDITING_ENABLED 5269 sctp_audit_log(0xE0, 1); 5270 sctp_auditing(0, inp, stcb, net); 5271 #endif 5272 if (compute_crc != 0) { 5273 uint32_t check, calc_check; 5274 5275 check = sh->checksum; 5276 sh->checksum = 0; 5277 calc_check = sctp_calculate_cksum(m, iphlen); 5278 sh->checksum = check; 5279 if (calc_check != check) { 5280 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x m:%p mlen:%d iphlen:%d\n", 5281 calc_check, check, (void *)m, length, iphlen); 5282 stcb = sctp_findassociation_addr(m, offset, src, dst, 5283 sh, ch, &inp, &net, vrf_id); 5284 #if defined(INET) || defined(INET6) 5285 if ((ch->chunk_type != SCTP_INITIATION) && 5286 (net != NULL) && (net->port != port)) { 5287 if (net->port == 0) { 5288 /* UDP encapsulation turned on. */ 5289 net->mtu -= sizeof(struct udphdr); 5290 if (stcb->asoc.smallest_mtu > net->mtu) { 5291 sctp_pathmtu_adjustment(stcb, net->mtu, true); 5292 } 5293 } else if (port == 0) { 5294 /* UDP encapsulation turned off. */ 5295 net->mtu += sizeof(struct udphdr); 5296 /* XXX Update smallest_mtu */ 5297 } 5298 net->port = port; 5299 } 5300 #endif 5301 if (net != NULL) { 5302 net->flowtype = mflowtype; 5303 net->flowid = mflowid; 5304 } 5305 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5306 if ((inp != NULL) && (stcb != NULL)) { 5307 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1); 5308 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED); 5309 } else if ((inp != NULL) && (stcb == NULL)) { 5310 inp_decr = inp; 5311 } 5312 SCTP_STAT_INCR(sctps_badsum); 5313 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors); 5314 goto out; 5315 } 5316 } 5317 /* Destination port of 0 is illegal, based on RFC4960. */ 5318 if (sh->dest_port == 0) { 5319 SCTP_STAT_INCR(sctps_hdrops); 5320 goto out; 5321 } 5322 stcb = sctp_findassociation_addr(m, offset, src, dst, 5323 sh, ch, &inp, &net, vrf_id); 5324 #if defined(INET) || defined(INET6) 5325 if ((ch->chunk_type != SCTP_INITIATION) && 5326 (net != NULL) && (net->port != port)) { 5327 if (net->port == 0) { 5328 /* UDP encapsulation turned on. */ 5329 net->mtu -= sizeof(struct udphdr); 5330 if (stcb->asoc.smallest_mtu > net->mtu) { 5331 sctp_pathmtu_adjustment(stcb, net->mtu, true); 5332 } 5333 } else if (port == 0) { 5334 /* UDP encapsulation turned off. */ 5335 net->mtu += sizeof(struct udphdr); 5336 /* XXX Update smallest_mtu */ 5337 } 5338 net->port = port; 5339 } 5340 #endif 5341 if (net != NULL) { 5342 net->flowtype = mflowtype; 5343 net->flowid = mflowid; 5344 } 5345 if (inp == NULL) { 5346 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5347 SCTP_STAT_INCR(sctps_noport); 5348 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) { 5349 goto out; 5350 } 5351 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 5352 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks); 5353 sctp_send_shutdown_complete2(src, dst, sh, 5354 mflowtype, mflowid, fibnum, 5355 vrf_id, port); 5356 goto out; 5357 } 5358 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) { 5359 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks); 5360 goto out; 5361 } 5362 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) { 5363 if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) || 5364 ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) && 5365 (ch->chunk_type != SCTP_INIT))) { 5366 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5367 "Out of the blue"); 5368 sctp_send_abort(m, iphlen, src, dst, 5369 sh, 0, op_err, 5370 mflowtype, mflowid, fibnum, 5371 vrf_id, port); 5372 } 5373 } 5374 goto out; 5375 } else if (stcb == NULL) { 5376 inp_decr = inp; 5377 } 5378 SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n", 5379 (void *)m, iphlen, offset, length, (void *)stcb); 5380 if (stcb) { 5381 /* always clear this before beginning a packet */ 5382 stcb->asoc.authenticated = 0; 5383 stcb->asoc.seen_a_sack_this_pkt = 0; 5384 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n", 5385 (void *)stcb, stcb->asoc.state); 5386 5387 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) || 5388 (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) { 5389 /*- 5390 * If we hit here, we had a ref count 5391 * up when the assoc was aborted and the 5392 * timer is clearing out the assoc, we should 5393 * NOT respond to any packet.. its OOTB. 5394 */ 5395 SCTP_TCB_UNLOCK(stcb); 5396 stcb = NULL; 5397 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5398 SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5399 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5400 msg); 5401 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5402 mflowtype, mflowid, inp->fibnum, 5403 vrf_id, port); 5404 goto out; 5405 } 5406 } 5407 if (IS_SCTP_CONTROL(ch)) { 5408 /* process the control portion of the SCTP packet */ 5409 /* sa_ignore NO_NULL_CHK */ 5410 stcb = sctp_process_control(m, iphlen, &offset, length, 5411 src, dst, sh, ch, 5412 inp, stcb, &net, &fwd_tsn_seen, 5413 mflowtype, mflowid, fibnum, 5414 vrf_id, port); 5415 if (stcb) { 5416 /* 5417 * This covers us if the cookie-echo was there and 5418 * it changes our INP. 5419 */ 5420 inp = stcb->sctp_ep; 5421 #if defined(INET) || defined(INET6) 5422 if ((ch->chunk_type != SCTP_INITIATION) && 5423 (net != NULL) && (net->port != port)) { 5424 if (net->port == 0) { 5425 /* UDP encapsulation turned on. */ 5426 net->mtu -= sizeof(struct udphdr); 5427 if (stcb->asoc.smallest_mtu > net->mtu) { 5428 sctp_pathmtu_adjustment(stcb, net->mtu, true); 5429 } 5430 } else if (port == 0) { 5431 /* UDP encapsulation turned off. */ 5432 net->mtu += sizeof(struct udphdr); 5433 /* XXX Update smallest_mtu */ 5434 } 5435 net->port = port; 5436 } 5437 #endif 5438 } 5439 } else { 5440 /* 5441 * no control chunks, so pre-process DATA chunks (these 5442 * checks are taken care of by control processing) 5443 */ 5444 5445 /* 5446 * if DATA only packet, and auth is required, then punt... 5447 * can't have authenticated without any AUTH (control) 5448 * chunks 5449 */ 5450 if ((stcb != NULL) && 5451 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) { 5452 /* "silently" ignore */ 5453 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5454 SCTP_STAT_INCR(sctps_recvauthmissing); 5455 goto out; 5456 } 5457 if (stcb == NULL) { 5458 /* out of the blue DATA chunk */ 5459 SCTP_PROBE5(receive, NULL, NULL, m, NULL, sh); 5460 SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5461 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5462 msg); 5463 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5464 mflowtype, mflowid, fibnum, 5465 vrf_id, port); 5466 goto out; 5467 } 5468 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) { 5469 /* v_tag mismatch! */ 5470 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5471 SCTP_STAT_INCR(sctps_badvtag); 5472 goto out; 5473 } 5474 } 5475 5476 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5477 if (stcb == NULL) { 5478 /* 5479 * no valid TCB for this packet, or we found it's a bad 5480 * packet while processing control, or we're done with this 5481 * packet (done or skip rest of data), so we drop it... 5482 */ 5483 goto out; 5484 } 5485 5486 /* 5487 * DATA chunk processing 5488 */ 5489 /* plow through the data chunks while length > offset */ 5490 5491 /* 5492 * Rest should be DATA only. Check authentication state if AUTH for 5493 * DATA is required. 5494 */ 5495 if ((length > offset) && 5496 (stcb != NULL) && 5497 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) && 5498 !stcb->asoc.authenticated) { 5499 /* "silently" ignore */ 5500 SCTP_STAT_INCR(sctps_recvauthmissing); 5501 SCTPDBG(SCTP_DEBUG_AUTH1, 5502 "Data chunk requires AUTH, skipped\n"); 5503 goto trigger_send; 5504 } 5505 if (length > offset) { 5506 int retval; 5507 5508 /* 5509 * First check to make sure our state is correct. We would 5510 * not get here unless we really did have a tag, so we don't 5511 * abort if this happens, just dump the chunk silently. 5512 */ 5513 switch (SCTP_GET_STATE(stcb)) { 5514 case SCTP_STATE_COOKIE_ECHOED: 5515 /* 5516 * we consider data with valid tags in this state 5517 * shows us the cookie-ack was lost. Imply it was 5518 * there. 5519 */ 5520 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net); 5521 break; 5522 case SCTP_STATE_COOKIE_WAIT: 5523 /* 5524 * We consider OOTB any data sent during asoc setup. 5525 */ 5526 SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5527 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5528 msg); 5529 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5530 mflowtype, mflowid, inp->fibnum, 5531 vrf_id, port); 5532 goto out; 5533 /* sa_ignore NOTREACHED */ 5534 break; 5535 case SCTP_STATE_EMPTY: /* should not happen */ 5536 case SCTP_STATE_INUSE: /* should not happen */ 5537 case SCTP_STATE_SHUTDOWN_RECEIVED: /* This is a peer error */ 5538 case SCTP_STATE_SHUTDOWN_ACK_SENT: 5539 default: 5540 goto out; 5541 /* sa_ignore NOTREACHED */ 5542 break; 5543 case SCTP_STATE_OPEN: 5544 case SCTP_STATE_SHUTDOWN_SENT: 5545 break; 5546 } 5547 /* plow through the data chunks while length > offset */ 5548 retval = sctp_process_data(mm, iphlen, &offset, length, 5549 inp, stcb, net, &high_tsn); 5550 if (retval == 2) { 5551 /* 5552 * The association aborted, NO UNLOCK needed since 5553 * the association is destroyed. 5554 */ 5555 stcb = NULL; 5556 goto out; 5557 } 5558 if (retval == 0) { 5559 data_processed = 1; 5560 } 5561 /* 5562 * Anything important needs to have been m_copy'ed in 5563 * process_data 5564 */ 5565 } 5566 5567 /* take care of ecn */ 5568 if ((data_processed == 1) && 5569 (stcb->asoc.ecn_supported == 1) && 5570 ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) { 5571 /* Yep, we need to add a ECNE */ 5572 sctp_send_ecn_echo(stcb, net, high_tsn); 5573 } 5574 5575 if ((data_processed == 0) && (fwd_tsn_seen)) { 5576 int was_a_gap; 5577 uint32_t highest_tsn; 5578 5579 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) { 5580 highest_tsn = stcb->asoc.highest_tsn_inside_nr_map; 5581 } else { 5582 highest_tsn = stcb->asoc.highest_tsn_inside_map; 5583 } 5584 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn); 5585 stcb->asoc.send_sack = 1; 5586 sctp_sack_check(stcb, was_a_gap); 5587 } else if (fwd_tsn_seen) { 5588 stcb->asoc.send_sack = 1; 5589 } 5590 /* trigger send of any chunks in queue... */ 5591 trigger_send: 5592 #ifdef SCTP_AUDITING_ENABLED 5593 sctp_audit_log(0xE0, 2); 5594 sctp_auditing(1, inp, stcb, net); 5595 #endif 5596 SCTPDBG(SCTP_DEBUG_INPUT1, 5597 "Check for chunk output prw:%d tqe:%d tf=%d\n", 5598 stcb->asoc.peers_rwnd, 5599 TAILQ_EMPTY(&stcb->asoc.control_send_queue), 5600 stcb->asoc.total_flight); 5601 un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight); 5602 if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 5603 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq; 5604 } 5605 if (!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue) || 5606 cnt_ctrl_ready || 5607 stcb->asoc.trigger_reset || 5608 ((un_sent > 0) && 5609 (stcb->asoc.peers_rwnd > 0 || stcb->asoc.total_flight == 0))) { 5610 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n"); 5611 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 5612 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n"); 5613 } 5614 #ifdef SCTP_AUDITING_ENABLED 5615 sctp_audit_log(0xE0, 3); 5616 sctp_auditing(2, inp, stcb, net); 5617 #endif 5618 out: 5619 if (stcb != NULL) { 5620 SCTP_TCB_UNLOCK(stcb); 5621 } 5622 if (inp_decr != NULL) { 5623 /* reduce ref-count */ 5624 SCTP_INP_WLOCK(inp_decr); 5625 SCTP_INP_DECR_REF(inp_decr); 5626 SCTP_INP_WUNLOCK(inp_decr); 5627 } 5628 return; 5629 } 5630 5631 #ifdef INET 5632 void 5633 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port) 5634 { 5635 struct mbuf *m; 5636 int iphlen; 5637 uint32_t vrf_id = 0; 5638 uint8_t ecn_bits; 5639 struct sockaddr_in src, dst; 5640 struct ip *ip; 5641 struct sctphdr *sh; 5642 struct sctp_chunkhdr *ch; 5643 int length, offset; 5644 uint8_t compute_crc; 5645 uint32_t mflowid; 5646 uint8_t mflowtype; 5647 uint16_t fibnum; 5648 5649 iphlen = off; 5650 if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) { 5651 SCTP_RELEASE_PKT(i_pak); 5652 return; 5653 } 5654 m = SCTP_HEADER_TO_CHAIN(i_pak); 5655 #ifdef SCTP_MBUF_LOGGING 5656 /* Log in any input mbufs */ 5657 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5658 sctp_log_mbc(m, SCTP_MBUF_INPUT); 5659 } 5660 #endif 5661 #ifdef SCTP_PACKET_LOGGING 5662 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) { 5663 sctp_packet_log(m); 5664 } 5665 #endif 5666 SCTPDBG(SCTP_DEBUG_CRCOFFLOAD, 5667 "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n", 5668 m->m_pkthdr.len, 5669 if_name(m->m_pkthdr.rcvif), 5670 (int)m->m_pkthdr.csum_flags, CSUM_BITS); 5671 mflowid = m->m_pkthdr.flowid; 5672 mflowtype = M_HASHTYPE_GET(m); 5673 fibnum = M_GETFIB(m); 5674 SCTP_STAT_INCR(sctps_recvpackets); 5675 SCTP_STAT_INCR_COUNTER64(sctps_inpackets); 5676 /* Get IP, SCTP, and first chunk header together in the first mbuf. */ 5677 offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr); 5678 if (SCTP_BUF_LEN(m) < offset) { 5679 if ((m = m_pullup(m, offset)) == NULL) { 5680 SCTP_STAT_INCR(sctps_hdrops); 5681 return; 5682 } 5683 } 5684 ip = mtod(m, struct ip *); 5685 sh = (struct sctphdr *)((caddr_t)ip + iphlen); 5686 ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr)); 5687 offset -= sizeof(struct sctp_chunkhdr); 5688 memset(&src, 0, sizeof(struct sockaddr_in)); 5689 src.sin_family = AF_INET; 5690 src.sin_len = sizeof(struct sockaddr_in); 5691 src.sin_port = sh->src_port; 5692 src.sin_addr = ip->ip_src; 5693 memset(&dst, 0, sizeof(struct sockaddr_in)); 5694 dst.sin_family = AF_INET; 5695 dst.sin_len = sizeof(struct sockaddr_in); 5696 dst.sin_port = sh->dest_port; 5697 dst.sin_addr = ip->ip_dst; 5698 length = ntohs(ip->ip_len); 5699 /* Validate mbuf chain length with IP payload length. */ 5700 if (SCTP_HEADER_LEN(m) != length) { 5701 SCTPDBG(SCTP_DEBUG_INPUT1, 5702 "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m)); 5703 SCTP_STAT_INCR(sctps_hdrops); 5704 goto out; 5705 } 5706 /* SCTP does not allow broadcasts or multicasts */ 5707 if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) { 5708 goto out; 5709 } 5710 if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) { 5711 goto out; 5712 } 5713 ecn_bits = ip->ip_tos; 5714 if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) { 5715 SCTP_STAT_INCR(sctps_recvhwcrc); 5716 compute_crc = 0; 5717 } else { 5718 SCTP_STAT_INCR(sctps_recvswcrc); 5719 compute_crc = 1; 5720 } 5721 sctp_common_input_processing(&m, iphlen, offset, length, 5722 (struct sockaddr *)&src, 5723 (struct sockaddr *)&dst, 5724 sh, ch, 5725 compute_crc, 5726 ecn_bits, 5727 mflowtype, mflowid, fibnum, 5728 vrf_id, port); 5729 out: 5730 if (m) { 5731 sctp_m_freem(m); 5732 } 5733 return; 5734 } 5735 5736 #if defined(SCTP_MCORE_INPUT) && defined(SMP) 5737 extern int *sctp_cpuarry; 5738 #endif 5739 5740 int 5741 sctp_input(struct mbuf **mp, int *offp, int proto SCTP_UNUSED) 5742 { 5743 struct mbuf *m; 5744 int off; 5745 5746 m = *mp; 5747 off = *offp; 5748 #if defined(SCTP_MCORE_INPUT) && defined(SMP) 5749 if (mp_ncpus > 1) { 5750 struct ip *ip; 5751 struct sctphdr *sh; 5752 int offset; 5753 int cpu_to_use; 5754 uint32_t flowid, tag; 5755 5756 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) { 5757 flowid = m->m_pkthdr.flowid; 5758 } else { 5759 /* 5760 * No flow id built by lower layers fix it so we 5761 * create one. 5762 */ 5763 offset = off + sizeof(struct sctphdr); 5764 if (SCTP_BUF_LEN(m) < offset) { 5765 if ((m = m_pullup(m, offset)) == NULL) { 5766 SCTP_STAT_INCR(sctps_hdrops); 5767 return (IPPROTO_DONE); 5768 } 5769 } 5770 ip = mtod(m, struct ip *); 5771 sh = (struct sctphdr *)((caddr_t)ip + off); 5772 tag = htonl(sh->v_tag); 5773 flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port); 5774 m->m_pkthdr.flowid = flowid; 5775 M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE_HASH); 5776 } 5777 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus]; 5778 sctp_queue_to_mcore(m, off, cpu_to_use); 5779 return (IPPROTO_DONE); 5780 } 5781 #endif 5782 sctp_input_with_port(m, off, 0); 5783 return (IPPROTO_DONE); 5784 } 5785 #endif 5786