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_association(stcb->sctp_ep, stcb, m, iphlen, 416 src, dst, sh, op_err, 417 mflowtype, mflowid, 418 vrf_id, net->port); 419 *abort_no_unlock = 1; 420 return (-1); 421 } 422 if (!cookie_found) { 423 uint16_t len; 424 425 /* Only report the missing cookie parameter */ 426 if (op_err != NULL) { 427 sctp_m_freem(op_err); 428 } 429 len = (uint16_t)(sizeof(struct sctp_error_missing_param) + sizeof(uint16_t)); 430 /* We abort with an error of missing mandatory param */ 431 op_err = sctp_get_mbuf_for_msg(len, 0, M_NOWAIT, 1, MT_DATA); 432 if (op_err != NULL) { 433 struct sctp_error_missing_param *cause; 434 435 SCTP_BUF_LEN(op_err) = len; 436 cause = mtod(op_err, struct sctp_error_missing_param *); 437 /* Subtract the reserved param */ 438 cause->cause.code = htons(SCTP_CAUSE_MISSING_PARAM); 439 cause->cause.length = htons(len); 440 cause->num_missing_params = htonl(1); 441 cause->type[0] = htons(SCTP_STATE_COOKIE); 442 } 443 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 444 src, dst, sh, op_err, 445 mflowtype, mflowid, 446 vrf_id, net->port); 447 *abort_no_unlock = 1; 448 return (-3); 449 } 450 asoc = &stcb->asoc; 451 asoc->peer_supports_nat = (uint8_t)nat_friendly; 452 /* process the peer's parameters in the INIT-ACK */ 453 if (sctp_process_init((struct sctp_init_chunk *)cp, stcb) < 0) { 454 if (op_err != NULL) { 455 sctp_m_freem(op_err); 456 } 457 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 458 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_init() failed\n"); 459 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 460 src, dst, sh, op_err, 461 mflowtype, mflowid, 462 vrf_id, net->port); 463 *abort_no_unlock = 1; 464 return (-1); 465 } 466 initack_limit = offset + ntohs(cp->ch.chunk_length); 467 /* load all addresses */ 468 if ((retval = sctp_load_addresses_from_init(stcb, m, 469 offset + sizeof(struct sctp_init_chunk), 470 initack_limit, src, dst, NULL, stcb->asoc.port)) < 0) { 471 if (op_err != NULL) { 472 sctp_m_freem(op_err); 473 } 474 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 475 "Problem with address parameters"); 476 SCTPDBG(SCTP_DEBUG_INPUT1, 477 "Load addresses from INIT causes an abort %d\n", 478 retval); 479 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 480 src, dst, sh, op_err, 481 mflowtype, mflowid, 482 vrf_id, net->port); 483 *abort_no_unlock = 1; 484 return (-1); 485 } 486 /* if the peer doesn't support asconf, flush the asconf queue */ 487 if (asoc->asconf_supported == 0) { 488 struct sctp_asconf_addr *param, *nparam; 489 490 TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) { 491 TAILQ_REMOVE(&asoc->asconf_queue, param, next); 492 SCTP_FREE(param, SCTP_M_ASC_ADDR); 493 } 494 } 495 496 stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs, 497 stcb->asoc.local_hmacs); 498 if (op_err) { 499 sctp_queue_op_err(stcb, op_err); 500 /* queuing will steal away the mbuf chain to the out queue */ 501 op_err = NULL; 502 } 503 /* extract the cookie and queue it to "echo" it back... */ 504 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 505 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 506 stcb->asoc.overall_error_count, 507 0, 508 SCTP_FROM_SCTP_INPUT, 509 __LINE__); 510 } 511 stcb->asoc.overall_error_count = 0; 512 net->error_count = 0; 513 514 /* 515 * Cancel the INIT timer, We do this first before queueing the 516 * cookie. We always cancel at the primary to assume that we are 517 * canceling the timer started by the INIT which always goes to the 518 * primary. 519 */ 520 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb, 521 asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3); 522 523 /* calculate the RTO */ 524 sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, 525 SCTP_RTT_FROM_NON_DATA); 526 retval = sctp_send_cookie_echo(m, offset, initack_limit, stcb, net); 527 return (retval); 528 } 529 530 static void 531 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp, 532 struct sctp_tcb *stcb, struct sctp_nets *net) 533 { 534 union sctp_sockstore store; 535 struct sctp_nets *r_net, *f_net; 536 struct timeval tv; 537 int req_prim = 0; 538 uint16_t old_error_counter; 539 540 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) { 541 /* Invalid length */ 542 return; 543 } 544 545 memset(&store, 0, sizeof(store)); 546 switch (cp->heartbeat.hb_info.addr_family) { 547 #ifdef INET 548 case AF_INET: 549 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) { 550 store.sin.sin_family = cp->heartbeat.hb_info.addr_family; 551 store.sin.sin_len = cp->heartbeat.hb_info.addr_len; 552 store.sin.sin_port = stcb->rport; 553 memcpy(&store.sin.sin_addr, cp->heartbeat.hb_info.address, 554 sizeof(store.sin.sin_addr)); 555 } else { 556 return; 557 } 558 break; 559 #endif 560 #ifdef INET6 561 case AF_INET6: 562 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) { 563 store.sin6.sin6_family = cp->heartbeat.hb_info.addr_family; 564 store.sin6.sin6_len = cp->heartbeat.hb_info.addr_len; 565 store.sin6.sin6_port = stcb->rport; 566 memcpy(&store.sin6.sin6_addr, cp->heartbeat.hb_info.address, sizeof(struct in6_addr)); 567 } else { 568 return; 569 } 570 break; 571 #endif 572 default: 573 return; 574 } 575 r_net = sctp_findnet(stcb, &store.sa); 576 if (r_net == NULL) { 577 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n"); 578 return; 579 } 580 if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) && 581 (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) && 582 (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) { 583 /* 584 * If the its a HB and it's random value is correct when can 585 * confirm the destination. 586 */ 587 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 588 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) { 589 stcb->asoc.primary_destination = r_net; 590 r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY; 591 f_net = TAILQ_FIRST(&stcb->asoc.nets); 592 if (f_net != r_net) { 593 /* 594 * first one on the list is NOT the primary 595 * sctp_cmpaddr() is much more efficient if 596 * the primary is the first on the list, 597 * make it so. 598 */ 599 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next); 600 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next); 601 } 602 req_prim = 1; 603 } 604 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 605 stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 606 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, 607 r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4); 608 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 609 } 610 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 611 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 612 stcb->asoc.overall_error_count, 613 0, 614 SCTP_FROM_SCTP_INPUT, 615 __LINE__); 616 } 617 stcb->asoc.overall_error_count = 0; 618 old_error_counter = r_net->error_count; 619 r_net->error_count = 0; 620 r_net->hb_responded = 1; 621 tv.tv_sec = cp->heartbeat.hb_info.time_value_1; 622 tv.tv_usec = cp->heartbeat.hb_info.time_value_2; 623 /* Now lets do a RTO with this */ 624 sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, 625 SCTP_RTT_FROM_NON_DATA); 626 if ((r_net->dest_state & SCTP_ADDR_REACHABLE) == 0) { 627 r_net->dest_state |= SCTP_ADDR_REACHABLE; 628 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb, 629 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 630 } 631 if (r_net->dest_state & SCTP_ADDR_PF) { 632 r_net->dest_state &= ~SCTP_ADDR_PF; 633 stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net); 634 } 635 if (old_error_counter > 0) { 636 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 637 stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_5); 638 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 639 } 640 if (r_net == stcb->asoc.primary_destination) { 641 if (stcb->asoc.alternate) { 642 /* release the alternate, primary is good */ 643 sctp_free_remote_addr(stcb->asoc.alternate); 644 stcb->asoc.alternate = NULL; 645 } 646 } 647 /* Mobility adaptation */ 648 if (req_prim) { 649 if ((sctp_is_mobility_feature_on(stcb->sctp_ep, 650 SCTP_MOBILITY_BASE) || 651 sctp_is_mobility_feature_on(stcb->sctp_ep, 652 SCTP_MOBILITY_FASTHANDOFF)) && 653 sctp_is_mobility_feature_on(stcb->sctp_ep, 654 SCTP_MOBILITY_PRIM_DELETED)) { 655 sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED, 656 stcb->sctp_ep, stcb, NULL, 657 SCTP_FROM_SCTP_INPUT + SCTP_LOC_6); 658 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 659 SCTP_MOBILITY_FASTHANDOFF)) { 660 sctp_assoc_immediate_retrans(stcb, 661 stcb->asoc.primary_destination); 662 } 663 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 664 SCTP_MOBILITY_BASE)) { 665 sctp_move_chunks_from_net(stcb, 666 stcb->asoc.deleted_primary); 667 } 668 sctp_delete_prim_timer(stcb->sctp_ep, stcb); 669 } 670 } 671 } 672 673 static int 674 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb) 675 { 676 /* 677 * Return 0 means we want you to proceed with the abort non-zero 678 * means no abort processing. 679 */ 680 uint32_t new_vtag; 681 struct sctpasochead *head; 682 683 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || 684 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 685 atomic_add_int(&stcb->asoc.refcnt, 1); 686 SCTP_TCB_UNLOCK(stcb); 687 SCTP_INP_INFO_WLOCK(); 688 SCTP_TCB_LOCK(stcb); 689 atomic_subtract_int(&stcb->asoc.refcnt, 1); 690 } else { 691 return (0); 692 } 693 new_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 694 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) { 695 /* generate a new vtag and send init */ 696 LIST_REMOVE(stcb, sctp_asocs); 697 stcb->asoc.my_vtag = new_vtag; 698 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 699 /* 700 * put it in the bucket in the vtag hash of assoc's for the 701 * system 702 */ 703 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 704 SCTP_INP_INFO_WUNLOCK(); 705 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 706 return (1); 707 } else { 708 /* 709 * treat like a case where the cookie expired i.e.: - dump 710 * current cookie. - generate a new vtag. - resend init. 711 */ 712 /* generate a new vtag and send init */ 713 LIST_REMOVE(stcb, sctp_asocs); 714 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT); 715 sctp_stop_all_cookie_timers(stcb); 716 sctp_toss_old_cookies(stcb, &stcb->asoc); 717 stcb->asoc.my_vtag = new_vtag; 718 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 719 /* 720 * put it in the bucket in the vtag hash of assoc's for the 721 * system 722 */ 723 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 724 SCTP_INP_INFO_WUNLOCK(); 725 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 726 return (1); 727 } 728 return (0); 729 } 730 731 static int 732 sctp_handle_nat_missing_state(struct sctp_tcb *stcb, 733 struct sctp_nets *net) 734 { 735 /* 736 * return 0 means we want you to proceed with the abort non-zero 737 * means no abort processing 738 */ 739 if (stcb->asoc.auth_supported == 0) { 740 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n"); 741 return (0); 742 } 743 sctp_asconf_send_nat_state_update(stcb, net); 744 return (1); 745 } 746 747 /* Returns 1 if the stcb was aborted, 0 otherwise */ 748 static int 749 sctp_handle_abort(struct sctp_abort_chunk *abort, 750 struct sctp_tcb *stcb, struct sctp_nets *net) 751 { 752 uint16_t len; 753 uint16_t error; 754 755 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n"); 756 if (stcb == NULL) 757 return (0); 758 759 len = ntohs(abort->ch.chunk_length); 760 if (len >= sizeof(struct sctp_chunkhdr) + sizeof(struct sctp_error_cause)) { 761 /* 762 * Need to check the cause codes for our two magic nat 763 * aborts which don't kill the assoc necessarily. 764 */ 765 struct sctp_error_cause *cause; 766 767 cause = (struct sctp_error_cause *)(abort + 1); 768 error = ntohs(cause->code); 769 if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) { 770 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state, ABORT flags:%x\n", 771 abort->ch.chunk_flags); 772 if (sctp_handle_nat_colliding_state(stcb)) { 773 return (0); 774 } 775 } else if (error == SCTP_CAUSE_NAT_MISSING_STATE) { 776 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state, ABORT flags:%x\n", 777 abort->ch.chunk_flags); 778 if (sctp_handle_nat_missing_state(stcb, net)) { 779 return (0); 780 } 781 } 782 } else { 783 error = 0; 784 } 785 /* stop any receive timers */ 786 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, NULL, 787 SCTP_FROM_SCTP_INPUT + SCTP_LOC_7); 788 /* notify user of the abort and clean up... */ 789 sctp_abort_notification(stcb, true, false, error, abort, SCTP_SO_NOT_LOCKED); 790 /* free the tcb */ 791 SCTP_STAT_INCR_COUNTER32(sctps_aborted); 792 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) || 793 (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 794 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 795 } 796 #ifdef SCTP_ASOCLOG_OF_TSNS 797 sctp_print_out_track_log(stcb); 798 #endif 799 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 800 SCTP_FROM_SCTP_INPUT + SCTP_LOC_8); 801 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n"); 802 return (1); 803 } 804 805 static void 806 sctp_start_net_timers(struct sctp_tcb *stcb) 807 { 808 uint32_t cnt_hb_sent; 809 struct sctp_nets *net; 810 811 cnt_hb_sent = 0; 812 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 813 /* 814 * For each network start: 1) A pmtu timer. 2) A HB timer 3) 815 * If the dest in unconfirmed send a hb as well if under 816 * max_hb_burst have been sent. 817 */ 818 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net); 819 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net); 820 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) && 821 (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) { 822 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 823 cnt_hb_sent++; 824 } 825 } 826 if (cnt_hb_sent) { 827 sctp_chunk_output(stcb->sctp_ep, stcb, 828 SCTP_OUTPUT_FROM_COOKIE_ACK, 829 SCTP_SO_NOT_LOCKED); 830 } 831 } 832 833 static void 834 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp, 835 struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag) 836 { 837 struct sctp_association *asoc; 838 int some_on_streamwheel; 839 int old_state; 840 841 SCTPDBG(SCTP_DEBUG_INPUT2, 842 "sctp_handle_shutdown: handling SHUTDOWN\n"); 843 if (stcb == NULL) 844 return; 845 asoc = &stcb->asoc; 846 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || 847 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 848 return; 849 } 850 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) { 851 /* Shutdown NOT the expected size */ 852 return; 853 } 854 old_state = SCTP_GET_STATE(stcb); 855 sctp_update_acked(stcb, cp, abort_flag); 856 if (*abort_flag) { 857 return; 858 } 859 if (asoc->control_pdapi) { 860 /* 861 * With a normal shutdown we assume the end of last record. 862 */ 863 SCTP_INP_READ_LOCK(stcb->sctp_ep); 864 if (asoc->control_pdapi->on_strm_q) { 865 struct sctp_stream_in *strm; 866 867 strm = &asoc->strmin[asoc->control_pdapi->sinfo_stream]; 868 if (asoc->control_pdapi->on_strm_q == SCTP_ON_UNORDERED) { 869 /* Unordered */ 870 TAILQ_REMOVE(&strm->uno_inqueue, asoc->control_pdapi, next_instrm); 871 asoc->control_pdapi->on_strm_q = 0; 872 } else if (asoc->control_pdapi->on_strm_q == SCTP_ON_ORDERED) { 873 /* Ordered */ 874 TAILQ_REMOVE(&strm->inqueue, asoc->control_pdapi, next_instrm); 875 asoc->control_pdapi->on_strm_q = 0; 876 #ifdef INVARIANTS 877 } else { 878 panic("Unknown state on ctrl:%p on_strm_q:%d", 879 asoc->control_pdapi, 880 asoc->control_pdapi->on_strm_q); 881 #endif 882 } 883 } 884 asoc->control_pdapi->end_added = 1; 885 asoc->control_pdapi->pdapi_aborted = 1; 886 asoc->control_pdapi = NULL; 887 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 888 if (stcb->sctp_socket) { 889 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 890 } 891 } 892 /* goto SHUTDOWN_RECEIVED state to block new requests */ 893 if (stcb->sctp_socket) { 894 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) && 895 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) && 896 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT)) { 897 SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_RECEIVED); 898 /* 899 * notify upper layer that peer has initiated a 900 * shutdown 901 */ 902 sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 903 904 /* reset time */ 905 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 906 } 907 } 908 if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) { 909 /* 910 * stop the shutdown timer, since we WILL move to 911 * SHUTDOWN-ACK-SENT. 912 */ 913 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, 914 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9); 915 } 916 /* Now is there unsent data on a stream somewhere? */ 917 some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED); 918 919 if (!TAILQ_EMPTY(&asoc->send_queue) || 920 !TAILQ_EMPTY(&asoc->sent_queue) || 921 some_on_streamwheel) { 922 /* By returning we will push more data out */ 923 return; 924 } else { 925 /* no outstanding data to send, so move on... */ 926 /* send SHUTDOWN-ACK */ 927 /* move to SHUTDOWN-ACK-SENT state */ 928 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) || 929 (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 930 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 931 } 932 if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 933 SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_ACK_SENT); 934 sctp_stop_timers_for_shutdown(stcb); 935 sctp_send_shutdown_ack(stcb, net); 936 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, 937 stcb->sctp_ep, stcb, net); 938 } else if (old_state == SCTP_STATE_SHUTDOWN_ACK_SENT) { 939 sctp_send_shutdown_ack(stcb, net); 940 } 941 } 942 } 943 944 static void 945 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED, 946 struct sctp_tcb *stcb, 947 struct sctp_nets *net) 948 { 949 struct sctp_association *asoc; 950 951 SCTPDBG(SCTP_DEBUG_INPUT2, 952 "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n"); 953 if (stcb == NULL) 954 return; 955 956 asoc = &stcb->asoc; 957 /* process according to association state */ 958 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || 959 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 960 /* unexpected SHUTDOWN-ACK... do OOTB handling... */ 961 sctp_send_shutdown_complete(stcb, net, 1); 962 SCTP_TCB_UNLOCK(stcb); 963 return; 964 } 965 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) && 966 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) { 967 /* unexpected SHUTDOWN-ACK... so ignore... */ 968 SCTP_TCB_UNLOCK(stcb); 969 return; 970 } 971 if (asoc->control_pdapi) { 972 /* 973 * With a normal shutdown we assume the end of last record. 974 */ 975 SCTP_INP_READ_LOCK(stcb->sctp_ep); 976 asoc->control_pdapi->end_added = 1; 977 asoc->control_pdapi->pdapi_aborted = 1; 978 asoc->control_pdapi = NULL; 979 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 980 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 981 } 982 #ifdef INVARIANTS 983 if (!TAILQ_EMPTY(&asoc->send_queue) || 984 !TAILQ_EMPTY(&asoc->sent_queue) || 985 sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) { 986 panic("Queues are not empty when handling SHUTDOWN-ACK"); 987 } 988 #endif 989 /* stop the timer */ 990 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, 991 SCTP_FROM_SCTP_INPUT + SCTP_LOC_10); 992 /* send SHUTDOWN-COMPLETE */ 993 sctp_send_shutdown_complete(stcb, net, 0); 994 /* notify upper layer protocol */ 995 if (stcb->sctp_socket) { 996 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 997 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 998 SCTP_SB_CLEAR(stcb->sctp_socket->so_snd); 999 } 1000 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 1001 } 1002 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 1003 /* free the TCB but first save off the ep */ 1004 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1005 SCTP_FROM_SCTP_INPUT + SCTP_LOC_11); 1006 } 1007 1008 static void 1009 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, uint8_t chunk_type) 1010 { 1011 switch (chunk_type) { 1012 case SCTP_ASCONF_ACK: 1013 case SCTP_ASCONF: 1014 sctp_asconf_cleanup(stcb); 1015 break; 1016 case SCTP_IFORWARD_CUM_TSN: 1017 case SCTP_FORWARD_CUM_TSN: 1018 stcb->asoc.prsctp_supported = 0; 1019 break; 1020 default: 1021 SCTPDBG(SCTP_DEBUG_INPUT2, 1022 "Peer does not support chunk type %d (0x%x).\n", 1023 chunk_type, chunk_type); 1024 break; 1025 } 1026 } 1027 1028 /* 1029 * Skip past the param header and then we will find the param that caused the 1030 * problem. There are a number of param's in a ASCONF OR the prsctp param 1031 * these will turn of specific features. 1032 * XXX: Is this the right thing to do? 1033 */ 1034 static void 1035 sctp_process_unrecog_param(struct sctp_tcb *stcb, uint16_t parameter_type) 1036 { 1037 switch (parameter_type) { 1038 /* pr-sctp draft */ 1039 case SCTP_PRSCTP_SUPPORTED: 1040 stcb->asoc.prsctp_supported = 0; 1041 break; 1042 case SCTP_SUPPORTED_CHUNK_EXT: 1043 break; 1044 /* draft-ietf-tsvwg-addip-sctp */ 1045 case SCTP_HAS_NAT_SUPPORT: 1046 stcb->asoc.peer_supports_nat = 0; 1047 break; 1048 case SCTP_ADD_IP_ADDRESS: 1049 case SCTP_DEL_IP_ADDRESS: 1050 case SCTP_SET_PRIM_ADDR: 1051 stcb->asoc.asconf_supported = 0; 1052 break; 1053 case SCTP_SUCCESS_REPORT: 1054 case SCTP_ERROR_CAUSE_IND: 1055 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n"); 1056 SCTPDBG(SCTP_DEBUG_INPUT2, 1057 "Turning off ASCONF to this strange peer\n"); 1058 stcb->asoc.asconf_supported = 0; 1059 break; 1060 default: 1061 SCTPDBG(SCTP_DEBUG_INPUT2, 1062 "Peer does not support param type %d (0x%x)??\n", 1063 parameter_type, parameter_type); 1064 break; 1065 } 1066 } 1067 1068 static int 1069 sctp_handle_error(struct sctp_chunkhdr *ch, 1070 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 1071 { 1072 struct sctp_error_cause *cause; 1073 struct sctp_association *asoc; 1074 uint32_t remaining_length, adjust; 1075 uint16_t code, cause_code, cause_length; 1076 1077 /* parse through all of the errors and process */ 1078 asoc = &stcb->asoc; 1079 cause = (struct sctp_error_cause *)((caddr_t)ch + 1080 sizeof(struct sctp_chunkhdr)); 1081 remaining_length = ntohs(ch->chunk_length); 1082 if (remaining_length > limit) { 1083 remaining_length = limit; 1084 } 1085 if (remaining_length >= sizeof(struct sctp_chunkhdr)) { 1086 remaining_length -= sizeof(struct sctp_chunkhdr); 1087 } else { 1088 remaining_length = 0; 1089 } 1090 code = 0; 1091 while (remaining_length >= sizeof(struct sctp_error_cause)) { 1092 /* Process an Error Cause */ 1093 cause_code = ntohs(cause->code); 1094 cause_length = ntohs(cause->length); 1095 if ((cause_length > remaining_length) || (cause_length == 0)) { 1096 /* Invalid cause length, possibly due to truncation. */ 1097 SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in cause - bytes left: %u cause length: %u\n", 1098 remaining_length, cause_length); 1099 return (0); 1100 } 1101 if (code == 0) { 1102 /* report the first error cause */ 1103 code = cause_code; 1104 } 1105 switch (cause_code) { 1106 case SCTP_CAUSE_INVALID_STREAM: 1107 case SCTP_CAUSE_MISSING_PARAM: 1108 case SCTP_CAUSE_INVALID_PARAM: 1109 case SCTP_CAUSE_NO_USER_DATA: 1110 SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %u back? We have a bug :/ (or do they?)\n", 1111 cause_code); 1112 break; 1113 case SCTP_CAUSE_NAT_COLLIDING_STATE: 1114 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state, ERROR flags: %x\n", 1115 ch->chunk_flags); 1116 if (sctp_handle_nat_colliding_state(stcb)) { 1117 return (0); 1118 } 1119 break; 1120 case SCTP_CAUSE_NAT_MISSING_STATE: 1121 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state, ERROR flags: %x\n", 1122 ch->chunk_flags); 1123 if (sctp_handle_nat_missing_state(stcb, net)) { 1124 return (0); 1125 } 1126 break; 1127 case SCTP_CAUSE_STALE_COOKIE: 1128 /* 1129 * We only act if we have echoed a cookie and are 1130 * waiting. 1131 */ 1132 if ((cause_length >= sizeof(struct sctp_error_stale_cookie)) && 1133 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 1134 struct sctp_error_stale_cookie *stale_cookie; 1135 1136 stale_cookie = (struct sctp_error_stale_cookie *)cause; 1137 /* stable_time is in usec, convert to msec. */ 1138 asoc->cookie_preserve_req = ntohl(stale_cookie->stale_time) / 1000; 1139 /* Double it to be more robust on RTX. */ 1140 asoc->cookie_preserve_req *= 2; 1141 asoc->stale_cookie_count++; 1142 if (asoc->stale_cookie_count > 1143 asoc->max_init_times) { 1144 sctp_abort_notification(stcb, false, true, 0, NULL, SCTP_SO_NOT_LOCKED); 1145 /* now free the asoc */ 1146 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1147 SCTP_FROM_SCTP_INPUT + SCTP_LOC_12); 1148 return (-1); 1149 } 1150 /* blast back to INIT state */ 1151 sctp_toss_old_cookies(stcb, &stcb->asoc); 1152 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT); 1153 sctp_stop_all_cookie_timers(stcb); 1154 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 1155 } 1156 break; 1157 case SCTP_CAUSE_UNRESOLVABLE_ADDR: 1158 /* 1159 * Nothing we can do here, we don't do hostname 1160 * addresses so if the peer does not like my IPv6 1161 * (or IPv4 for that matter) it does not matter. If 1162 * they don't support that type of address, they can 1163 * NOT possibly get that packet type... i.e. with no 1164 * IPv6 you can't receive a IPv6 packet. so we can 1165 * safely ignore this one. If we ever added support 1166 * for HOSTNAME Addresses, then we would need to do 1167 * something here. 1168 */ 1169 break; 1170 case SCTP_CAUSE_UNRECOG_CHUNK: 1171 if (cause_length >= sizeof(struct sctp_error_unrecognized_chunk)) { 1172 struct sctp_error_unrecognized_chunk *unrec_chunk; 1173 1174 unrec_chunk = (struct sctp_error_unrecognized_chunk *)cause; 1175 sctp_process_unrecog_chunk(stcb, unrec_chunk->ch.chunk_type); 1176 } 1177 break; 1178 case SCTP_CAUSE_UNRECOG_PARAM: 1179 /* XXX: We only consider the first parameter */ 1180 if (cause_length >= sizeof(struct sctp_error_cause) + sizeof(struct sctp_paramhdr)) { 1181 struct sctp_paramhdr *unrec_parameter; 1182 1183 unrec_parameter = (struct sctp_paramhdr *)(cause + 1); 1184 sctp_process_unrecog_param(stcb, ntohs(unrec_parameter->param_type)); 1185 } 1186 break; 1187 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN: 1188 /* 1189 * We ignore this since the timer will drive out a 1190 * new cookie anyway and there timer will drive us 1191 * to send a SHUTDOWN_COMPLETE. We can't send one 1192 * here since we don't have their tag. 1193 */ 1194 break; 1195 case SCTP_CAUSE_DELETING_LAST_ADDR: 1196 case SCTP_CAUSE_RESOURCE_SHORTAGE: 1197 case SCTP_CAUSE_DELETING_SRC_ADDR: 1198 /* 1199 * We should NOT get these here, but in a 1200 * ASCONF-ACK. 1201 */ 1202 SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a error cause with code %u.\n", 1203 cause_code); 1204 break; 1205 case SCTP_CAUSE_OUT_OF_RESC: 1206 /* 1207 * And what, pray tell do we do with the fact that 1208 * the peer is out of resources? Not really sure we 1209 * could do anything but abort. I suspect this 1210 * should have came WITH an abort instead of in a 1211 * OP-ERROR. 1212 */ 1213 break; 1214 default: 1215 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown code 0x%x\n", 1216 cause_code); 1217 break; 1218 } 1219 adjust = SCTP_SIZE32(cause_length); 1220 if (remaining_length >= adjust) { 1221 remaining_length -= adjust; 1222 } else { 1223 remaining_length = 0; 1224 } 1225 cause = (struct sctp_error_cause *)((caddr_t)cause + adjust); 1226 } 1227 sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, code, ch, SCTP_SO_NOT_LOCKED); 1228 return (0); 1229 } 1230 1231 static int 1232 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset, 1233 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 1234 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 1235 struct sctp_nets *net, int *abort_no_unlock, 1236 uint8_t mflowtype, uint32_t mflowid, 1237 uint32_t vrf_id) 1238 { 1239 struct sctp_init_ack *init_ack; 1240 struct mbuf *op_err; 1241 1242 SCTPDBG(SCTP_DEBUG_INPUT2, 1243 "sctp_handle_init_ack: handling INIT-ACK\n"); 1244 1245 if (stcb == NULL) { 1246 SCTPDBG(SCTP_DEBUG_INPUT2, 1247 "sctp_handle_init_ack: TCB is null\n"); 1248 return (-1); 1249 } 1250 /* Only process the INIT-ACK chunk in COOKIE WAIT state. */ 1251 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) { 1252 init_ack = &cp->init; 1253 /* Validate parameters. */ 1254 if ((ntohl(init_ack->initiate_tag) == 0) || 1255 (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) || 1256 (ntohs(init_ack->num_inbound_streams) == 0) || 1257 (ntohs(init_ack->num_outbound_streams) == 0)) { 1258 /* One of the mandatory parameters is illegal. */ 1259 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1260 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1261 src, dst, sh, op_err, 1262 mflowtype, mflowid, 1263 vrf_id, net->port); 1264 *abort_no_unlock = 1; 1265 return (-1); 1266 } 1267 if (stcb->asoc.primary_destination->dest_state & 1268 SCTP_ADDR_UNCONFIRMED) { 1269 /* 1270 * The primary is where we sent the INIT, we can 1271 * always consider it confirmed when the INIT-ACK is 1272 * returned. Do this before we load addresses 1273 * though. 1274 */ 1275 stcb->asoc.primary_destination->dest_state &= 1276 ~SCTP_ADDR_UNCONFIRMED; 1277 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 1278 stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED); 1279 } 1280 if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb, 1281 net, abort_no_unlock, 1282 mflowtype, mflowid, 1283 vrf_id) < 0) { 1284 /* error in parsing parameters */ 1285 return (-1); 1286 } 1287 /* Update our state. */ 1288 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n"); 1289 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_ECHOED); 1290 1291 /* Reset the RTO calculation. */ 1292 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 1293 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 1294 stcb->asoc.overall_error_count, 1295 0, 1296 SCTP_FROM_SCTP_INPUT, 1297 __LINE__); 1298 } 1299 stcb->asoc.overall_error_count = 0; 1300 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 1301 /* 1302 * Collapse the init timer back in case of a exponential 1303 * backoff. 1304 */ 1305 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep, 1306 stcb, net); 1307 /* 1308 * The output routine at the end of the inbound data 1309 * processing will cause the cookie to be sent. 1310 */ 1311 SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n"); 1312 return (0); 1313 } else { 1314 return (-1); 1315 } 1316 } 1317 1318 static struct sctp_tcb * 1319 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1320 struct sockaddr *src, struct sockaddr *dst, 1321 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1322 struct sctp_inpcb *inp, struct sctp_nets **netp, 1323 struct sockaddr *init_src, int *notification, 1324 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1325 uint8_t mflowtype, uint32_t mflowid, 1326 uint32_t vrf_id, uint16_t port); 1327 1328 /* 1329 * handle a state cookie for an existing association m: input packet mbuf 1330 * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a 1331 * "split" mbuf and the cookie signature does not exist offset: offset into 1332 * mbuf to the cookie-echo chunk 1333 */ 1334 static struct sctp_tcb * 1335 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset, 1336 struct sockaddr *src, struct sockaddr *dst, 1337 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1338 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp, 1339 struct sockaddr *init_src, int *notification, 1340 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1341 uint8_t mflowtype, uint32_t mflowid, 1342 uint32_t vrf_id, uint16_t port) 1343 { 1344 struct sctp_association *asoc; 1345 struct sctp_init_chunk *init_cp, init_buf; 1346 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1347 struct sctp_asconf_addr *aparam, *naparam; 1348 struct sctp_asconf_ack *aack, *naack; 1349 struct sctp_tmit_chunk *chk, *nchk; 1350 struct sctp_stream_reset_list *strrst, *nstrrst; 1351 struct sctp_queued_to_read *sq, *nsq; 1352 struct sctp_nets *net; 1353 struct mbuf *op_err; 1354 int init_offset, initack_offset, i; 1355 int retval; 1356 int spec_flag = 0; 1357 uint32_t how_indx; 1358 #if defined(SCTP_DETAILED_STR_STATS) 1359 int j; 1360 #endif 1361 1362 net = *netp; 1363 /* I know that the TCB is non-NULL from the caller */ 1364 asoc = &stcb->asoc; 1365 for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) { 1366 if (asoc->cookie_how[how_indx] == 0) 1367 break; 1368 } 1369 if (how_indx < sizeof(asoc->cookie_how)) { 1370 asoc->cookie_how[how_indx] = 1; 1371 } 1372 if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 1373 /* SHUTDOWN came in after sending INIT-ACK */ 1374 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination); 1375 op_err = sctp_generate_cause(SCTP_CAUSE_COOKIE_IN_SHUTDOWN, ""); 1376 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 1377 mflowtype, mflowid, inp->fibnum, 1378 vrf_id, net->port); 1379 if (how_indx < sizeof(asoc->cookie_how)) 1380 asoc->cookie_how[how_indx] = 2; 1381 SCTP_TCB_UNLOCK(stcb); 1382 return (NULL); 1383 } 1384 /* 1385 * find and validate the INIT chunk in the cookie (peer's info) the 1386 * INIT should start after the cookie-echo header struct (chunk 1387 * header, state cookie header struct) 1388 */ 1389 init_offset = offset += sizeof(struct sctp_cookie_echo_chunk); 1390 1391 init_cp = (struct sctp_init_chunk *) 1392 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 1393 (uint8_t *)&init_buf); 1394 if (init_cp == NULL) { 1395 /* could not pull a INIT chunk in cookie */ 1396 SCTP_TCB_UNLOCK(stcb); 1397 return (NULL); 1398 } 1399 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 1400 SCTP_TCB_UNLOCK(stcb); 1401 return (NULL); 1402 } 1403 /* 1404 * find and validate the INIT-ACK chunk in the cookie (my info) the 1405 * INIT-ACK follows the INIT chunk 1406 */ 1407 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 1408 initack_cp = (struct sctp_init_ack_chunk *) 1409 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 1410 (uint8_t *)&initack_buf); 1411 if (initack_cp == NULL) { 1412 /* could not pull INIT-ACK chunk in cookie */ 1413 SCTP_TCB_UNLOCK(stcb); 1414 return (NULL); 1415 } 1416 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 1417 SCTP_TCB_UNLOCK(stcb); 1418 return (NULL); 1419 } 1420 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1421 (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) { 1422 /* 1423 * case D in Section 5.2.4 Table 2: MMAA process accordingly 1424 * to get into the OPEN state 1425 */ 1426 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1427 /*- 1428 * Opps, this means that we somehow generated two vtag's 1429 * the same. I.e. we did: 1430 * Us Peer 1431 * <---INIT(tag=a)------ 1432 * ----INIT-ACK(tag=t)--> 1433 * ----INIT(tag=t)------> *1 1434 * <---INIT-ACK(tag=a)--- 1435 * <----CE(tag=t)------------- *2 1436 * 1437 * At point *1 we should be generating a different 1438 * tag t'. Which means we would throw away the CE and send 1439 * ours instead. Basically this is case C (throw away side). 1440 */ 1441 if (how_indx < sizeof(asoc->cookie_how)) 1442 asoc->cookie_how[how_indx] = 17; 1443 SCTP_TCB_UNLOCK(stcb); 1444 return (NULL); 1445 } 1446 switch (SCTP_GET_STATE(stcb)) { 1447 case SCTP_STATE_COOKIE_WAIT: 1448 case SCTP_STATE_COOKIE_ECHOED: 1449 /* 1450 * INIT was sent but got a COOKIE_ECHO with the 1451 * correct tags... just accept it...but we must 1452 * process the init so that we can make sure we have 1453 * the right seq no's. 1454 */ 1455 /* First we must process the INIT !! */ 1456 if (sctp_process_init(init_cp, stcb) < 0) { 1457 if (how_indx < sizeof(asoc->cookie_how)) 1458 asoc->cookie_how[how_indx] = 3; 1459 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 1460 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_init() failed\n"); 1461 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1462 src, dst, sh, op_err, 1463 mflowtype, mflowid, 1464 vrf_id, net->port); 1465 return (NULL); 1466 } 1467 /* we have already processed the INIT so no problem */ 1468 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, 1469 stcb, net, 1470 SCTP_FROM_SCTP_INPUT + SCTP_LOC_13); 1471 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, 1472 stcb, net, 1473 SCTP_FROM_SCTP_INPUT + SCTP_LOC_14); 1474 /* update current state */ 1475 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) 1476 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1477 else 1478 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1479 1480 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 1481 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1482 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1483 stcb->sctp_ep, stcb, NULL); 1484 } 1485 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1486 sctp_stop_all_cookie_timers(stcb); 1487 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1488 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1489 (!SCTP_IS_LISTENING(inp))) { 1490 /* 1491 * Here is where collision would go if we 1492 * did a connect() and instead got a 1493 * init/init-ack/cookie done before the 1494 * init-ack came back.. 1495 */ 1496 sctp_pcb_add_flags(stcb->sctp_ep, SCTP_PCB_FLAGS_CONNECTED); 1497 soisconnected(stcb->sctp_socket); 1498 } 1499 /* notify upper layer */ 1500 *notification = SCTP_NOTIFY_ASSOC_UP; 1501 net->hb_responded = 1; 1502 if (stcb->asoc.sctp_autoclose_ticks && 1503 (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) { 1504 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 1505 inp, stcb, NULL); 1506 } 1507 break; 1508 default: 1509 /* 1510 * we're in the OPEN state (or beyond), so peer must 1511 * have simply lost the COOKIE-ACK 1512 */ 1513 break; 1514 } /* end switch */ 1515 sctp_stop_all_cookie_timers(stcb); 1516 if ((retval = sctp_load_addresses_from_init(stcb, m, 1517 init_offset + sizeof(struct sctp_init_chunk), 1518 initack_offset, src, dst, init_src, stcb->asoc.port)) < 0) { 1519 if (how_indx < sizeof(asoc->cookie_how)) 1520 asoc->cookie_how[how_indx] = 4; 1521 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 1522 "Problem with address parameters"); 1523 SCTPDBG(SCTP_DEBUG_INPUT1, 1524 "Load addresses from INIT causes an abort %d\n", 1525 retval); 1526 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1527 src, dst, sh, op_err, 1528 mflowtype, mflowid, 1529 vrf_id, net->port); 1530 return (NULL); 1531 } 1532 /* respond with a COOKIE-ACK */ 1533 sctp_toss_old_cookies(stcb, asoc); 1534 sctp_send_cookie_ack(stcb); 1535 if (how_indx < sizeof(asoc->cookie_how)) 1536 asoc->cookie_how[how_indx] = 5; 1537 return (stcb); 1538 } 1539 1540 if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1541 ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag && 1542 cookie->tie_tag_my_vtag == 0 && 1543 cookie->tie_tag_peer_vtag == 0) { 1544 /* 1545 * case C in Section 5.2.4 Table 2: XMOO silently discard 1546 */ 1547 if (how_indx < sizeof(asoc->cookie_how)) 1548 asoc->cookie_how[how_indx] = 6; 1549 SCTP_TCB_UNLOCK(stcb); 1550 return (NULL); 1551 } 1552 /* 1553 * If nat support, and the below and stcb is established, send back 1554 * a ABORT(colliding state) if we are established. 1555 */ 1556 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) && 1557 (asoc->peer_supports_nat) && 1558 ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1559 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1560 (asoc->peer_vtag == 0)))) { 1561 /* 1562 * Special case - Peer's support nat. We may have two init's 1563 * that we gave out the same tag on since one was not 1564 * established.. i.e. we get INIT from host-1 behind the nat 1565 * and we respond tag-a, we get a INIT from host-2 behind 1566 * the nat and we get tag-a again. Then we bring up host-1 1567 * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1). 1568 * Now we have colliding state. We must send an abort here 1569 * with colliding state indication. 1570 */ 1571 op_err = sctp_generate_cause(SCTP_CAUSE_NAT_COLLIDING_STATE, ""); 1572 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err, 1573 mflowtype, mflowid, inp->fibnum, 1574 vrf_id, port); 1575 SCTP_TCB_UNLOCK(stcb); 1576 return (NULL); 1577 } 1578 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1579 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1580 (asoc->peer_vtag == 0))) { 1581 /* 1582 * case B in Section 5.2.4 Table 2: MXAA or MOAA my info 1583 * should be ok, re-accept peer info 1584 */ 1585 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1586 /* 1587 * Extension of case C. If we hit this, then the 1588 * random number generator returned the same vtag 1589 * when we first sent our INIT-ACK and when we later 1590 * sent our INIT. The side with the seq numbers that 1591 * are different will be the one that normally would 1592 * have hit case C. This in effect "extends" our 1593 * vtags in this collision case to be 64 bits. The 1594 * same collision could occur aka you get both vtag 1595 * and seq number the same twice in a row.. but is 1596 * much less likely. If it did happen then we would 1597 * proceed through and bring up the assoc.. we may 1598 * end up with the wrong stream setup however.. 1599 * which would be bad.. but there is no way to 1600 * tell.. until we send on a stream that does not 1601 * exist :-) 1602 */ 1603 if (how_indx < sizeof(asoc->cookie_how)) 1604 asoc->cookie_how[how_indx] = 7; 1605 1606 SCTP_TCB_UNLOCK(stcb); 1607 return (NULL); 1608 } 1609 if (how_indx < sizeof(asoc->cookie_how)) 1610 asoc->cookie_how[how_indx] = 8; 1611 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, 1612 SCTP_FROM_SCTP_INPUT + SCTP_LOC_15); 1613 sctp_stop_all_cookie_timers(stcb); 1614 /* 1615 * since we did not send a HB make sure we don't double 1616 * things 1617 */ 1618 net->hb_responded = 1; 1619 if (stcb->asoc.sctp_autoclose_ticks && 1620 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 1621 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, 1622 NULL); 1623 } 1624 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1625 if (asoc->pre_open_streams < asoc->streamoutcnt) { 1626 asoc->pre_open_streams = asoc->streamoutcnt; 1627 } 1628 1629 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) { 1630 /* 1631 * Ok the peer probably discarded our data (if we 1632 * echoed a cookie+data). So anything on the 1633 * sent_queue should be marked for retransmit, we 1634 * may not get something to kick us so it COULD 1635 * still take a timeout to move these.. but it can't 1636 * hurt to mark them. 1637 */ 1638 1639 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 1640 if (chk->sent < SCTP_DATAGRAM_RESEND) { 1641 chk->sent = SCTP_DATAGRAM_RESEND; 1642 sctp_flight_size_decrease(chk); 1643 sctp_total_flight_decrease(stcb, chk); 1644 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 1645 spec_flag++; 1646 } 1647 } 1648 } 1649 /* process the INIT info (peer's info) */ 1650 if (sctp_process_init(init_cp, stcb) < 0) { 1651 if (how_indx < sizeof(asoc->cookie_how)) 1652 asoc->cookie_how[how_indx] = 9; 1653 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 1654 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_init() failed\n"); 1655 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1656 src, dst, sh, op_err, 1657 mflowtype, mflowid, 1658 vrf_id, net->port); 1659 return (NULL); 1660 } 1661 if ((retval = sctp_load_addresses_from_init(stcb, m, 1662 init_offset + sizeof(struct sctp_init_chunk), 1663 initack_offset, src, dst, init_src, stcb->asoc.port)) < 0) { 1664 if (how_indx < sizeof(asoc->cookie_how)) 1665 asoc->cookie_how[how_indx] = 10; 1666 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 1667 "Problem with address parameters"); 1668 SCTPDBG(SCTP_DEBUG_INPUT1, 1669 "Load addresses from INIT causes an abort %d\n", 1670 retval); 1671 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1672 src, dst, sh, op_err, 1673 mflowtype, mflowid, 1674 vrf_id, net->port); 1675 return (NULL); 1676 } 1677 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || 1678 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 1679 *notification = SCTP_NOTIFY_ASSOC_UP; 1680 1681 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1682 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1683 (!SCTP_IS_LISTENING(inp))) { 1684 sctp_pcb_add_flags(stcb->sctp_ep, SCTP_PCB_FLAGS_CONNECTED); 1685 soisconnected(stcb->sctp_socket); 1686 } 1687 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) 1688 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1689 else 1690 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1691 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1692 } else if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) { 1693 SCTP_STAT_INCR_COUNTER32(sctps_restartestab); 1694 } else { 1695 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1696 } 1697 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 1698 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1699 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1700 stcb->sctp_ep, stcb, NULL); 1701 } 1702 sctp_stop_all_cookie_timers(stcb); 1703 sctp_toss_old_cookies(stcb, asoc); 1704 sctp_send_cookie_ack(stcb); 1705 if (spec_flag) { 1706 /* 1707 * only if we have retrans set do we do this. What 1708 * this call does is get only the COOKIE-ACK out and 1709 * then when we return the normal call to 1710 * sctp_chunk_output will get the retrans out behind 1711 * this. 1712 */ 1713 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED); 1714 } 1715 if (how_indx < sizeof(asoc->cookie_how)) 1716 asoc->cookie_how[how_indx] = 11; 1717 1718 return (stcb); 1719 } 1720 if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1721 ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) && 1722 cookie->tie_tag_my_vtag == asoc->my_vtag_nonce && 1723 cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce && 1724 cookie->tie_tag_peer_vtag != 0) { 1725 struct sctpasochead *head; 1726 1727 if (asoc->peer_supports_nat) { 1728 struct sctp_tcb *local_stcb; 1729 1730 /* 1731 * This is a gross gross hack. Just call the 1732 * cookie_new code since we are allowing a duplicate 1733 * association. I hope this works... 1734 */ 1735 local_stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, 1736 sh, cookie, cookie_len, 1737 inp, netp, init_src, notification, 1738 auth_skipped, auth_offset, auth_len, 1739 mflowtype, mflowid, 1740 vrf_id, port); 1741 if (local_stcb == NULL) { 1742 SCTP_TCB_UNLOCK(stcb); 1743 } 1744 return (local_stcb); 1745 } 1746 /* 1747 * case A in Section 5.2.4 Table 2: XXMM (peer restarted) 1748 */ 1749 /* temp code */ 1750 if (how_indx < sizeof(asoc->cookie_how)) 1751 asoc->cookie_how[how_indx] = 12; 1752 sctp_stop_association_timers(stcb, false); 1753 /* notify upper layer */ 1754 *notification = SCTP_NOTIFY_ASSOC_RESTART; 1755 atomic_add_int(&stcb->asoc.refcnt, 1); 1756 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_OPEN) && 1757 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) && 1758 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT)) { 1759 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1760 } 1761 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) { 1762 SCTP_STAT_INCR_GAUGE32(sctps_restartestab); 1763 } else if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) { 1764 SCTP_STAT_INCR_GAUGE32(sctps_collisionestab); 1765 } 1766 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1767 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 1768 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1769 stcb->sctp_ep, stcb, NULL); 1770 1771 } else if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) { 1772 /* move to OPEN state, if not in SHUTDOWN_SENT */ 1773 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 1774 } 1775 if (asoc->pre_open_streams < asoc->streamoutcnt) { 1776 asoc->pre_open_streams = asoc->streamoutcnt; 1777 } 1778 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 1779 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 1780 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 1781 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 1782 asoc->str_reset_seq_in = asoc->init_seq_number; 1783 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 1784 asoc->send_sack = 1; 1785 asoc->data_pkts_seen = 0; 1786 asoc->last_data_chunk_from = NULL; 1787 asoc->last_control_chunk_from = NULL; 1788 asoc->last_net_cmt_send_started = NULL; 1789 if (asoc->mapping_array) { 1790 memset(asoc->mapping_array, 0, 1791 asoc->mapping_array_size); 1792 } 1793 if (asoc->nr_mapping_array) { 1794 memset(asoc->nr_mapping_array, 0, 1795 asoc->mapping_array_size); 1796 } 1797 SCTP_TCB_UNLOCK(stcb); 1798 SCTP_INP_INFO_WLOCK(); 1799 SCTP_INP_WLOCK(stcb->sctp_ep); 1800 SCTP_TCB_LOCK(stcb); 1801 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1802 /* send up all the data */ 1803 sctp_report_all_outbound(stcb, 0, SCTP_SO_LOCKED); 1804 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 1805 stcb->asoc.strmout[i].chunks_on_queues = 0; 1806 #if defined(SCTP_DETAILED_STR_STATS) 1807 for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) { 1808 asoc->strmout[i].abandoned_sent[j] = 0; 1809 asoc->strmout[i].abandoned_unsent[j] = 0; 1810 } 1811 #else 1812 asoc->strmout[i].abandoned_sent[0] = 0; 1813 asoc->strmout[i].abandoned_unsent[0] = 0; 1814 #endif 1815 stcb->asoc.strmout[i].next_mid_ordered = 0; 1816 stcb->asoc.strmout[i].next_mid_unordered = 0; 1817 stcb->asoc.strmout[i].sid = i; 1818 stcb->asoc.strmout[i].last_msg_incomplete = 0; 1819 } 1820 TAILQ_FOREACH_SAFE(strrst, &asoc->resetHead, next_resp, nstrrst) { 1821 TAILQ_REMOVE(&asoc->resetHead, strrst, next_resp); 1822 SCTP_FREE(strrst, SCTP_M_STRESET); 1823 } 1824 TAILQ_FOREACH_SAFE(sq, &asoc->pending_reply_queue, next, nsq) { 1825 TAILQ_REMOVE(&asoc->pending_reply_queue, sq, next); 1826 if (sq->data) { 1827 sctp_m_freem(sq->data); 1828 sq->data = NULL; 1829 } 1830 sctp_free_remote_addr(sq->whoFrom); 1831 sq->whoFrom = NULL; 1832 sq->stcb = NULL; 1833 sctp_free_a_readq(stcb, sq); 1834 } 1835 TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) { 1836 TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next); 1837 if (chk->data) { 1838 sctp_m_freem(chk->data); 1839 chk->data = NULL; 1840 } 1841 if (chk->holds_key_ref) 1842 sctp_auth_key_release(stcb, chk->auth_keyid, SCTP_SO_LOCKED); 1843 sctp_free_remote_addr(chk->whoTo); 1844 SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_chunk), chk); 1845 SCTP_DECR_CHK_COUNT(); 1846 } 1847 asoc->ctrl_queue_cnt = 0; 1848 asoc->str_reset = NULL; 1849 asoc->stream_reset_outstanding = 0; 1850 TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) { 1851 TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next); 1852 if (chk->data) { 1853 sctp_m_freem(chk->data); 1854 chk->data = NULL; 1855 } 1856 if (chk->holds_key_ref) 1857 sctp_auth_key_release(stcb, chk->auth_keyid, SCTP_SO_LOCKED); 1858 sctp_free_remote_addr(chk->whoTo); 1859 SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_chunk), chk); 1860 SCTP_DECR_CHK_COUNT(); 1861 } 1862 TAILQ_FOREACH_SAFE(aparam, &asoc->asconf_queue, next, naparam) { 1863 TAILQ_REMOVE(&asoc->asconf_queue, aparam, next); 1864 SCTP_FREE(aparam, SCTP_M_ASC_ADDR); 1865 } 1866 TAILQ_FOREACH_SAFE(aack, &asoc->asconf_ack_sent, next, naack) { 1867 TAILQ_REMOVE(&asoc->asconf_ack_sent, aack, next); 1868 if (aack->data != NULL) { 1869 sctp_m_freem(aack->data); 1870 } 1871 SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_asconf_ack), aack); 1872 } 1873 asoc->zero_checksum = cookie->zero_checksum; 1874 1875 /* process the INIT-ACK info (my info) */ 1876 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 1877 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1878 1879 /* pull from vtag hash */ 1880 LIST_REMOVE(stcb, sctp_asocs); 1881 /* re-insert to new vtag position */ 1882 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, 1883 SCTP_BASE_INFO(hashasocmark))]; 1884 /* 1885 * put it in the bucket in the vtag hash of assoc's for the 1886 * system 1887 */ 1888 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 1889 1890 SCTP_INP_WUNLOCK(stcb->sctp_ep); 1891 SCTP_INP_INFO_WUNLOCK(); 1892 asoc->total_flight = 0; 1893 asoc->total_flight_count = 0; 1894 /* process the INIT info (peer's info) */ 1895 if (sctp_process_init(init_cp, stcb) < 0) { 1896 if (how_indx < sizeof(asoc->cookie_how)) 1897 asoc->cookie_how[how_indx] = 13; 1898 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 1899 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_init() failed\n"); 1900 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1901 src, dst, sh, op_err, 1902 mflowtype, mflowid, 1903 vrf_id, net->port); 1904 return (NULL); 1905 } 1906 /* 1907 * since we did not send a HB make sure we don't double 1908 * things 1909 */ 1910 net->hb_responded = 1; 1911 1912 if ((retval = sctp_load_addresses_from_init(stcb, m, 1913 init_offset + sizeof(struct sctp_init_chunk), 1914 initack_offset, src, dst, init_src, stcb->asoc.port)) < 0) { 1915 if (how_indx < sizeof(asoc->cookie_how)) 1916 asoc->cookie_how[how_indx] = 14; 1917 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 1918 "Problem with address parameters"); 1919 SCTPDBG(SCTP_DEBUG_INPUT1, 1920 "Load addresses from INIT causes an abort %d\n", 1921 retval); 1922 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1923 src, dst, sh, op_err, 1924 mflowtype, mflowid, 1925 vrf_id, net->port); 1926 return (NULL); 1927 } 1928 /* respond with a COOKIE-ACK */ 1929 sctp_send_cookie_ack(stcb); 1930 if (how_indx < sizeof(asoc->cookie_how)) 1931 asoc->cookie_how[how_indx] = 15; 1932 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE) && 1933 (asoc->sctp_autoclose_ticks > 0)) { 1934 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL); 1935 } 1936 return (stcb); 1937 } 1938 if (how_indx < sizeof(asoc->cookie_how)) 1939 asoc->cookie_how[how_indx] = 16; 1940 /* all other cases... */ 1941 SCTP_TCB_UNLOCK(stcb); 1942 return (NULL); 1943 } 1944 1945 /* 1946 * handle a state cookie for a new association m: input packet mbuf chain-- 1947 * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf 1948 * and the cookie signature does not exist offset: offset into mbuf to the 1949 * cookie-echo chunk length: length of the cookie chunk to: where the init 1950 * was from returns a new TCB 1951 */ 1952 static struct sctp_tcb * 1953 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1954 struct sockaddr *src, struct sockaddr *dst, 1955 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1956 struct sctp_inpcb *inp, struct sctp_nets **netp, 1957 struct sockaddr *init_src, int *notification, 1958 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1959 uint8_t mflowtype, uint32_t mflowid, 1960 uint32_t vrf_id, uint16_t port) 1961 { 1962 struct sctp_tcb *stcb; 1963 struct sctp_init_chunk *init_cp, init_buf; 1964 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1965 union sctp_sockstore store; 1966 struct sctp_association *asoc; 1967 int init_offset, initack_offset, initack_limit; 1968 int error = 0; 1969 uint8_t auth_chunk_buf[SCTP_CHUNK_BUFFER_SIZE]; 1970 1971 /* 1972 * find and validate the INIT chunk in the cookie (peer's info) the 1973 * INIT should start after the cookie-echo header struct (chunk 1974 * header, state cookie header struct) 1975 */ 1976 init_offset = offset + sizeof(struct sctp_cookie_echo_chunk); 1977 init_cp = (struct sctp_init_chunk *) 1978 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 1979 (uint8_t *)&init_buf); 1980 if (init_cp == NULL) { 1981 /* could not pull a INIT chunk in cookie */ 1982 SCTPDBG(SCTP_DEBUG_INPUT1, 1983 "process_cookie_new: could not pull INIT chunk hdr\n"); 1984 return (NULL); 1985 } 1986 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 1987 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n"); 1988 return (NULL); 1989 } 1990 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 1991 /* 1992 * find and validate the INIT-ACK chunk in the cookie (my info) the 1993 * INIT-ACK follows the INIT chunk 1994 */ 1995 initack_cp = (struct sctp_init_ack_chunk *) 1996 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 1997 (uint8_t *)&initack_buf); 1998 if (initack_cp == NULL) { 1999 /* could not pull INIT-ACK chunk in cookie */ 2000 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n"); 2001 return (NULL); 2002 } 2003 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 2004 return (NULL); 2005 } 2006 /* 2007 * NOTE: We can't use the INIT_ACK's chk_length to determine the 2008 * "initack_limit" value. This is because the chk_length field 2009 * includes the length of the cookie, but the cookie is omitted when 2010 * the INIT and INIT_ACK are tacked onto the cookie... 2011 */ 2012 initack_limit = offset + cookie_len; 2013 2014 /* 2015 * now that we know the INIT/INIT-ACK are in place, create a new TCB 2016 * and populate 2017 */ 2018 2019 /* 2020 * Here we do a trick, we set in NULL for the proc/thread argument. 2021 * We do this since in effect we only use the p argument when the 2022 * socket is unbound and we must do an implicit bind. Since we are 2023 * getting a cookie, we cannot be unbound. 2024 */ 2025 stcb = sctp_aloc_assoc(inp, init_src, &error, 2026 ntohl(initack_cp->init.initiate_tag), 2027 ntohl(initack_cp->init.initial_tsn), vrf_id, 2028 ntohs(initack_cp->init.num_outbound_streams), 2029 port, 2030 (struct thread *)NULL, 2031 SCTP_DONT_INITIALIZE_AUTH_PARAMS); 2032 if (stcb == NULL) { 2033 struct mbuf *op_err; 2034 2035 /* memory problem? */ 2036 SCTPDBG(SCTP_DEBUG_INPUT1, 2037 "process_cookie_new: no room for another TCB!\n"); 2038 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2039 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2040 src, dst, sh, op_err, 2041 mflowtype, mflowid, 2042 vrf_id, port); 2043 return (NULL); 2044 } 2045 asoc = &stcb->asoc; 2046 /* get scope variables out of cookie */ 2047 asoc->scope.ipv4_local_scope = cookie->ipv4_scope; 2048 asoc->scope.site_scope = cookie->site_scope; 2049 asoc->scope.local_scope = cookie->local_scope; 2050 asoc->scope.loopback_scope = cookie->loopback_scope; 2051 2052 if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) || 2053 (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) { 2054 struct mbuf *op_err; 2055 2056 /* 2057 * Houston we have a problem. The EP changed while the 2058 * cookie was in flight. Only recourse is to abort the 2059 * association. 2060 */ 2061 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2062 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2063 src, dst, sh, op_err, 2064 mflowtype, mflowid, 2065 vrf_id, port); 2066 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2067 SCTP_FROM_SCTP_INPUT + SCTP_LOC_18); 2068 return (NULL); 2069 } 2070 asoc->zero_checksum = cookie->zero_checksum; 2071 /* process the INIT-ACK info (my info) */ 2072 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 2073 2074 /* process the INIT info (peer's info) */ 2075 if (sctp_process_init(init_cp, stcb) < 0) { 2076 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2077 SCTP_FROM_SCTP_INPUT + SCTP_LOC_19); 2078 return (NULL); 2079 } 2080 /* load all addresses */ 2081 if (sctp_load_addresses_from_init(stcb, m, 2082 init_offset + sizeof(struct sctp_init_chunk), 2083 initack_offset, src, dst, init_src, port) < 0) { 2084 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2085 SCTP_FROM_SCTP_INPUT + SCTP_LOC_20); 2086 return (NULL); 2087 } 2088 /* 2089 * verify any preceding AUTH chunk that was skipped 2090 */ 2091 /* pull the local authentication parameters from the cookie/init-ack */ 2092 sctp_auth_get_cookie_params(stcb, m, 2093 initack_offset + sizeof(struct sctp_init_ack_chunk), 2094 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk))); 2095 if (auth_skipped) { 2096 struct sctp_auth_chunk *auth; 2097 2098 if (auth_len <= SCTP_CHUNK_BUFFER_SIZE) { 2099 auth = (struct sctp_auth_chunk *)sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf); 2100 } else { 2101 auth = NULL; 2102 } 2103 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) { 2104 /* auth HMAC failed, dump the assoc and packet */ 2105 SCTPDBG(SCTP_DEBUG_AUTH1, 2106 "COOKIE-ECHO: AUTH failed\n"); 2107 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2108 SCTP_FROM_SCTP_INPUT + SCTP_LOC_21); 2109 return (NULL); 2110 } else { 2111 /* remaining chunks checked... good to go */ 2112 stcb->asoc.authenticated = 1; 2113 } 2114 } 2115 2116 /* 2117 * if we're doing ASCONFs, check to see if we have any new local 2118 * addresses that need to get added to the peer (eg. addresses 2119 * changed while cookie echo in flight). This needs to be done 2120 * after we go to the OPEN state to do the correct asconf 2121 * processing. else, make sure we have the correct addresses in our 2122 * lists 2123 */ 2124 2125 /* warning, we re-use sin, sin6, sa_store here! */ 2126 /* pull in local_address (our "from" address) */ 2127 switch (cookie->laddr_type) { 2128 #ifdef INET 2129 case SCTP_IPV4_ADDRESS: 2130 /* source addr is IPv4 */ 2131 memset(&store.sin, 0, sizeof(struct sockaddr_in)); 2132 store.sin.sin_family = AF_INET; 2133 store.sin.sin_len = sizeof(struct sockaddr_in); 2134 store.sin.sin_addr.s_addr = cookie->laddress[0]; 2135 break; 2136 #endif 2137 #ifdef INET6 2138 case SCTP_IPV6_ADDRESS: 2139 /* source addr is IPv6 */ 2140 memset(&store.sin6, 0, sizeof(struct sockaddr_in6)); 2141 store.sin6.sin6_family = AF_INET6; 2142 store.sin6.sin6_len = sizeof(struct sockaddr_in6); 2143 store.sin6.sin6_scope_id = cookie->scope_id; 2144 memcpy(&store.sin6.sin6_addr, cookie->laddress, sizeof(struct in6_addr)); 2145 break; 2146 #endif 2147 default: 2148 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2149 SCTP_FROM_SCTP_INPUT + SCTP_LOC_22); 2150 return (NULL); 2151 } 2152 2153 /* update current state */ 2154 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2155 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 2156 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2157 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2158 stcb->sctp_ep, stcb, NULL); 2159 } 2160 sctp_stop_all_cookie_timers(stcb); 2161 SCTP_STAT_INCR_COUNTER32(sctps_passiveestab); 2162 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2163 2164 /* set up to notify upper layer */ 2165 *notification = SCTP_NOTIFY_ASSOC_UP; 2166 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2167 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 2168 (!SCTP_IS_LISTENING(inp))) { 2169 /* 2170 * This is an endpoint that called connect() how it got a 2171 * cookie that is NEW is a bit of a mystery. It must be that 2172 * the INIT was sent, but before it got there.. a complete 2173 * INIT/INIT-ACK/COOKIE arrived. But of course then it 2174 * should have went to the other code.. not here.. oh well.. 2175 * a bit of protection is worth having.. 2176 * 2177 * XXXMJ unlocked 2178 */ 2179 sctp_pcb_add_flags(stcb->sctp_ep, SCTP_PCB_FLAGS_CONNECTED); 2180 soisconnected(stcb->sctp_socket); 2181 } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 2182 (SCTP_IS_LISTENING(inp))) { 2183 /* 2184 * We don't want to do anything with this one. Since it is 2185 * the listening guy. The timer will get started for 2186 * accepted connections in the caller. 2187 */ 2188 ; 2189 } 2190 if (stcb->asoc.sctp_autoclose_ticks && 2191 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2192 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL); 2193 } 2194 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 2195 *netp = sctp_findnet(stcb, init_src); 2196 if (*netp != NULL) { 2197 /* 2198 * Since we did not send a HB, make sure we don't double 2199 * things. 2200 */ 2201 (*netp)->hb_responded = 1; 2202 } 2203 /* respond with a COOKIE-ACK */ 2204 sctp_send_cookie_ack(stcb); 2205 2206 /* 2207 * check the address lists for any ASCONFs that need to be sent 2208 * AFTER the cookie-ack is sent 2209 */ 2210 sctp_check_address_list(stcb, m, 2211 initack_offset + sizeof(struct sctp_init_ack_chunk), 2212 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)), 2213 &store.sa, cookie->local_scope, cookie->site_scope, 2214 cookie->ipv4_scope, cookie->loopback_scope); 2215 2216 return (stcb); 2217 } 2218 2219 /* 2220 * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e 2221 * we NEED to make sure we are not already using the vtag. If so we 2222 * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit! 2223 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag, 2224 SCTP_BASE_INFO(hashasocmark))]; 2225 LIST_FOREACH(stcb, head, sctp_asocs) { 2226 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep)) { 2227 -- SEND ABORT - TRY AGAIN -- 2228 } 2229 } 2230 */ 2231 2232 /* 2233 * handles a COOKIE-ECHO message stcb: modified to either a new or left as 2234 * existing (non-NULL) TCB 2235 */ 2236 static struct mbuf * 2237 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset, 2238 struct sockaddr *src, struct sockaddr *dst, 2239 struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp, 2240 struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp, 2241 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2242 struct sctp_tcb **locked_tcb, 2243 uint8_t mflowtype, uint32_t mflowid, 2244 uint32_t vrf_id, uint16_t port) 2245 { 2246 struct sctp_state_cookie *cookie; 2247 struct sctp_tcb *l_stcb = *stcb; 2248 struct sctp_inpcb *l_inp; 2249 struct sockaddr *to; 2250 struct sctp_pcb *ep; 2251 struct mbuf *m_sig; 2252 uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE]; 2253 uint8_t *sig; 2254 uint8_t cookie_ok = 0; 2255 unsigned int sig_offset, cookie_offset; 2256 unsigned int cookie_len; 2257 struct timeval now; 2258 struct timeval time_entered, time_expires; 2259 int notification = 0; 2260 struct sctp_nets *netl; 2261 int had_a_existing_tcb = 0; 2262 int send_int_conf = 0; 2263 #ifdef INET 2264 struct sockaddr_in sin; 2265 #endif 2266 #ifdef INET6 2267 struct sockaddr_in6 sin6; 2268 #endif 2269 2270 SCTPDBG(SCTP_DEBUG_INPUT2, 2271 "sctp_handle_cookie: handling COOKIE-ECHO\n"); 2272 2273 if (inp_p == NULL) { 2274 return (NULL); 2275 } 2276 cookie = &cp->cookie; 2277 cookie_offset = offset + sizeof(struct sctp_chunkhdr); 2278 cookie_len = ntohs(cp->ch.chunk_length); 2279 2280 if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) + 2281 sizeof(struct sctp_init_chunk) + 2282 sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) { 2283 /* cookie too small */ 2284 return (NULL); 2285 } 2286 if ((cookie->peerport != sh->src_port) || 2287 (cookie->myport != sh->dest_port) || 2288 (cookie->my_vtag != sh->v_tag)) { 2289 /* 2290 * invalid ports or bad tag. Note that we always leave the 2291 * v_tag in the header in network order and when we stored 2292 * it in the my_vtag slot we also left it in network order. 2293 * This maintains the match even though it may be in the 2294 * opposite byte order of the machine :-> 2295 */ 2296 return (NULL); 2297 } 2298 /* 2299 * split off the signature into its own mbuf (since it should not be 2300 * calculated in the sctp_hmac_m() call). 2301 */ 2302 sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE; 2303 m_sig = m_split(m, sig_offset, M_NOWAIT); 2304 if (m_sig == NULL) { 2305 /* out of memory or ?? */ 2306 return (NULL); 2307 } 2308 #ifdef SCTP_MBUF_LOGGING 2309 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 2310 sctp_log_mbc(m_sig, SCTP_MBUF_SPLIT); 2311 } 2312 #endif 2313 2314 /* 2315 * compute the signature/digest for the cookie 2316 */ 2317 if (l_stcb != NULL) { 2318 atomic_add_int(&l_stcb->asoc.refcnt, 1); 2319 SCTP_TCB_UNLOCK(l_stcb); 2320 } 2321 l_inp = *inp_p; 2322 SCTP_INP_RLOCK(l_inp); 2323 if (l_stcb != NULL) { 2324 SCTP_TCB_LOCK(l_stcb); 2325 atomic_subtract_int(&l_stcb->asoc.refcnt, 1); 2326 } 2327 if (l_inp->sctp_flags & (SCTP_PCB_FLAGS_SOCKET_GONE | SCTP_PCB_FLAGS_SOCKET_ALLGONE)) { 2328 SCTP_INP_RUNLOCK(l_inp); 2329 sctp_m_freem(m_sig); 2330 return (NULL); 2331 } 2332 ep = &(*inp_p)->sctp_ep; 2333 /* which cookie is it? */ 2334 if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) && 2335 (ep->current_secret_number != ep->last_secret_number)) { 2336 /* it's the old cookie */ 2337 (void)sctp_hmac_m(SCTP_HMAC, 2338 (uint8_t *)ep->secret_key[(int)ep->last_secret_number], 2339 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2340 } else { 2341 /* it's the current cookie */ 2342 (void)sctp_hmac_m(SCTP_HMAC, 2343 (uint8_t *)ep->secret_key[(int)ep->current_secret_number], 2344 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2345 } 2346 /* get the signature */ 2347 SCTP_INP_RUNLOCK(l_inp); 2348 sig = (uint8_t *)sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *)&tmp_sig); 2349 if (sig == NULL) { 2350 /* couldn't find signature */ 2351 sctp_m_freem(m_sig); 2352 return (NULL); 2353 } 2354 /* compare the received digest with the computed digest */ 2355 if (timingsafe_bcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) { 2356 /* try the old cookie? */ 2357 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) && 2358 (ep->current_secret_number != ep->last_secret_number)) { 2359 /* compute digest with old */ 2360 (void)sctp_hmac_m(SCTP_HMAC, 2361 (uint8_t *)ep->secret_key[(int)ep->last_secret_number], 2362 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2363 /* compare */ 2364 if (timingsafe_bcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0) 2365 cookie_ok = 1; 2366 } 2367 } else { 2368 cookie_ok = 1; 2369 } 2370 2371 /* 2372 * Now before we continue we must reconstruct our mbuf so that 2373 * normal processing of any other chunks will work. 2374 */ 2375 { 2376 struct mbuf *m_at; 2377 2378 m_at = m; 2379 while (SCTP_BUF_NEXT(m_at) != NULL) { 2380 m_at = SCTP_BUF_NEXT(m_at); 2381 } 2382 SCTP_BUF_NEXT(m_at) = m_sig; 2383 } 2384 2385 if (cookie_ok == 0) { 2386 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n"); 2387 SCTPDBG(SCTP_DEBUG_INPUT2, 2388 "offset = %u, cookie_offset = %u, sig_offset = %u\n", 2389 (uint32_t)offset, cookie_offset, sig_offset); 2390 return (NULL); 2391 } 2392 2393 if (sctp_ticks_to_msecs(cookie->cookie_life) > SCTP_MAX_COOKIE_LIFE) { 2394 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: Invalid cookie lifetime\n"); 2395 return (NULL); 2396 } 2397 time_entered.tv_sec = cookie->time_entered.tv_sec; 2398 time_entered.tv_usec = cookie->time_entered.tv_usec; 2399 if ((time_entered.tv_sec < 0) || 2400 (time_entered.tv_usec < 0) || 2401 (time_entered.tv_usec >= 1000000)) { 2402 /* Invalid time stamp. Cookie must have been modified. */ 2403 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: Invalid time stamp\n"); 2404 return (NULL); 2405 } 2406 (void)SCTP_GETTIME_TIMEVAL(&now); 2407 if (timevalcmp(&now, &time_entered, <)) { 2408 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie generated in the future!\n"); 2409 return (NULL); 2410 } 2411 /* 2412 * Check the cookie timestamps to be sure it's not stale. 2413 * cookie_life is in ticks, so we convert to seconds. 2414 */ 2415 time_expires.tv_sec = time_entered.tv_sec + sctp_ticks_to_secs(cookie->cookie_life); 2416 time_expires.tv_usec = time_entered.tv_usec; 2417 if (timevalcmp(&now, &time_expires, >)) { 2418 /* cookie is stale! */ 2419 struct mbuf *op_err; 2420 struct sctp_error_stale_cookie *cause; 2421 struct timeval diff; 2422 uint32_t staleness; 2423 2424 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_error_stale_cookie), 2425 0, M_NOWAIT, 1, MT_DATA); 2426 if (op_err == NULL) { 2427 /* FOOBAR */ 2428 return (NULL); 2429 } 2430 /* Set the len */ 2431 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_error_stale_cookie); 2432 cause = mtod(op_err, struct sctp_error_stale_cookie *); 2433 cause->cause.code = htons(SCTP_CAUSE_STALE_COOKIE); 2434 cause->cause.length = htons(sizeof(struct sctp_error_stale_cookie)); 2435 diff = now; 2436 timevalsub(&diff, &time_expires); 2437 if ((uint32_t)diff.tv_sec > UINT32_MAX / 1000000) { 2438 staleness = UINT32_MAX; 2439 } else { 2440 staleness = (uint32_t)diff.tv_sec * 1000000; 2441 } 2442 if (UINT32_MAX - staleness >= (uint32_t)diff.tv_usec) { 2443 staleness += (uint32_t)diff.tv_usec; 2444 } else { 2445 staleness = UINT32_MAX; 2446 } 2447 cause->stale_time = htonl(staleness); 2448 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 2449 mflowtype, mflowid, l_inp->fibnum, 2450 vrf_id, port); 2451 return (NULL); 2452 } 2453 /* 2454 * Now we must see with the lookup address if we have an existing 2455 * asoc. This will only happen if we were in the COOKIE-WAIT state 2456 * and a INIT collided with us and somewhere the peer sent the 2457 * cookie on another address besides the single address our assoc 2458 * had for him. In this case we will have one of the tie-tags set at 2459 * least AND the address field in the cookie can be used to look it 2460 * up. 2461 */ 2462 to = NULL; 2463 switch (cookie->addr_type) { 2464 #ifdef INET6 2465 case SCTP_IPV6_ADDRESS: 2466 memset(&sin6, 0, sizeof(sin6)); 2467 sin6.sin6_family = AF_INET6; 2468 sin6.sin6_len = sizeof(sin6); 2469 sin6.sin6_port = sh->src_port; 2470 sin6.sin6_scope_id = cookie->scope_id; 2471 memcpy(&sin6.sin6_addr.s6_addr, cookie->address, 2472 sizeof(sin6.sin6_addr.s6_addr)); 2473 to = (struct sockaddr *)&sin6; 2474 break; 2475 #endif 2476 #ifdef INET 2477 case SCTP_IPV4_ADDRESS: 2478 memset(&sin, 0, sizeof(sin)); 2479 sin.sin_family = AF_INET; 2480 sin.sin_len = sizeof(sin); 2481 sin.sin_port = sh->src_port; 2482 sin.sin_addr.s_addr = cookie->address[0]; 2483 to = (struct sockaddr *)&sin; 2484 break; 2485 #endif 2486 default: 2487 /* This should not happen */ 2488 return (NULL); 2489 } 2490 if (*stcb == NULL) { 2491 /* Yep, lets check */ 2492 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL); 2493 if (*stcb == NULL) { 2494 /* 2495 * We should have only got back the same inp. If we 2496 * got back a different ep we have a problem. The 2497 * original findep got back l_inp and now 2498 */ 2499 if (l_inp != *inp_p) { 2500 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n"); 2501 } 2502 } else { 2503 if (*locked_tcb == NULL) { 2504 /* 2505 * In this case we found the assoc only 2506 * after we locked the create lock. This 2507 * means we are in a colliding case and we 2508 * must make sure that we unlock the tcb if 2509 * its one of the cases where we throw away 2510 * the incoming packets. 2511 */ 2512 *locked_tcb = *stcb; 2513 2514 /* 2515 * We must also increment the inp ref count 2516 * since the ref_count flags was set when we 2517 * did not find the TCB, now we found it 2518 * which reduces the refcount.. we must 2519 * raise it back out to balance it all :-) 2520 */ 2521 SCTP_INP_INCR_REF((*stcb)->sctp_ep); 2522 if ((*stcb)->sctp_ep != l_inp) { 2523 SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n", 2524 (void *)(*stcb)->sctp_ep, (void *)l_inp); 2525 } 2526 } 2527 } 2528 } 2529 2530 cookie_len -= SCTP_SIGNATURE_SIZE; 2531 if (*stcb == NULL) { 2532 /* this is the "normal" case... get a new TCB */ 2533 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh, 2534 cookie, cookie_len, *inp_p, 2535 netp, to, ¬ification, 2536 auth_skipped, auth_offset, auth_len, 2537 mflowtype, mflowid, 2538 vrf_id, port); 2539 } else { 2540 /* this is abnormal... cookie-echo on existing TCB */ 2541 had_a_existing_tcb = 1; 2542 *stcb = sctp_process_cookie_existing(m, iphlen, offset, 2543 src, dst, sh, 2544 cookie, cookie_len, *inp_p, *stcb, netp, to, 2545 ¬ification, auth_skipped, auth_offset, auth_len, 2546 mflowtype, mflowid, 2547 vrf_id, port); 2548 if (*stcb == NULL) { 2549 *locked_tcb = NULL; 2550 } 2551 } 2552 2553 if (*stcb == NULL) { 2554 /* still no TCB... must be bad cookie-echo */ 2555 return (NULL); 2556 } 2557 if (*netp != NULL) { 2558 (*netp)->flowtype = mflowtype; 2559 (*netp)->flowid = mflowid; 2560 } 2561 /* 2562 * Ok, we built an association so confirm the address we sent the 2563 * INIT-ACK to. 2564 */ 2565 netl = sctp_findnet(*stcb, to); 2566 /* 2567 * This code should in theory NOT run but 2568 */ 2569 if (netl == NULL) { 2570 /* TSNH! Huh, why do I need to add this address here? */ 2571 if (sctp_add_remote_addr(*stcb, to, NULL, port, 2572 SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) { 2573 return (NULL); 2574 } 2575 netl = sctp_findnet(*stcb, to); 2576 } 2577 if (netl) { 2578 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) { 2579 netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 2580 (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL, 2581 netl); 2582 send_int_conf = 1; 2583 } 2584 } 2585 sctp_start_net_timers(*stcb); 2586 if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) { 2587 if (!had_a_existing_tcb || 2588 (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) { 2589 /* 2590 * If we have a NEW cookie or the connect never 2591 * reached the connected state during collision we 2592 * must do the TCP accept thing. 2593 */ 2594 struct socket *so, *oso; 2595 struct sctp_inpcb *inp; 2596 2597 if (notification == SCTP_NOTIFY_ASSOC_RESTART) { 2598 /* 2599 * For a restart we will keep the same 2600 * socket, no need to do anything. I THINK!! 2601 */ 2602 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2603 if (send_int_conf) { 2604 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2605 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2606 } 2607 return (m); 2608 } 2609 oso = (*inp_p)->sctp_socket; 2610 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2611 SCTP_TCB_UNLOCK((*stcb)); 2612 CURVNET_SET(oso->so_vnet); 2613 so = sonewconn(oso, 0 2614 ); 2615 CURVNET_RESTORE(); 2616 SCTP_TCB_LOCK((*stcb)); 2617 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2618 2619 if (so == NULL) { 2620 struct mbuf *op_err; 2621 2622 /* Too many sockets */ 2623 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n"); 2624 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2625 sctp_abort_association(*inp_p, NULL, m, iphlen, 2626 src, dst, sh, op_err, 2627 mflowtype, mflowid, 2628 vrf_id, port); 2629 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, 2630 SCTP_FROM_SCTP_INPUT + SCTP_LOC_23); 2631 return (NULL); 2632 } 2633 inp = (struct sctp_inpcb *)so->so_pcb; 2634 SCTP_INP_INCR_REF(inp); 2635 /* 2636 * We add the unbound flag here so that if we get an 2637 * soabort() before we get the move_pcb done, we 2638 * will properly cleanup. 2639 */ 2640 inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE | 2641 SCTP_PCB_FLAGS_CONNECTED | 2642 SCTP_PCB_FLAGS_IN_TCPPOOL | 2643 SCTP_PCB_FLAGS_UNBOUND | 2644 (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) | 2645 SCTP_PCB_FLAGS_DONT_WAKE); 2646 inp->sctp_features = (*inp_p)->sctp_features; 2647 inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features; 2648 inp->sctp_socket = so; 2649 inp->sctp_frag_point = (*inp_p)->sctp_frag_point; 2650 inp->max_cwnd = (*inp_p)->max_cwnd; 2651 inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off; 2652 inp->ecn_supported = (*inp_p)->ecn_supported; 2653 inp->prsctp_supported = (*inp_p)->prsctp_supported; 2654 inp->auth_supported = (*inp_p)->auth_supported; 2655 inp->asconf_supported = (*inp_p)->asconf_supported; 2656 inp->reconfig_supported = (*inp_p)->reconfig_supported; 2657 inp->nrsack_supported = (*inp_p)->nrsack_supported; 2658 inp->pktdrop_supported = (*inp_p)->pktdrop_supported; 2659 inp->partial_delivery_point = (*inp_p)->partial_delivery_point; 2660 inp->sctp_context = (*inp_p)->sctp_context; 2661 inp->local_strreset_support = (*inp_p)->local_strreset_support; 2662 inp->fibnum = (*inp_p)->fibnum; 2663 /* 2664 * copy in the authentication parameters from the 2665 * original endpoint 2666 */ 2667 if (inp->sctp_ep.local_hmacs) 2668 sctp_free_hmaclist(inp->sctp_ep.local_hmacs); 2669 inp->sctp_ep.local_hmacs = 2670 sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs); 2671 if (inp->sctp_ep.local_auth_chunks) 2672 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks); 2673 inp->sctp_ep.local_auth_chunks = 2674 sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks); 2675 2676 /* 2677 * Now we must move it from one hash table to 2678 * another and get the tcb in the right place. 2679 */ 2680 2681 /* 2682 * This is where the one-2-one socket is put into 2683 * the accept state waiting for the accept! 2684 */ 2685 if (*stcb) { 2686 SCTP_ADD_SUBSTATE(*stcb, SCTP_STATE_IN_ACCEPT_QUEUE); 2687 } 2688 sctp_move_pcb_and_assoc(*inp_p, inp, *stcb); 2689 2690 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2691 SCTP_TCB_UNLOCK((*stcb)); 2692 2693 sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb, 2694 0); 2695 SCTP_TCB_LOCK((*stcb)); 2696 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2697 2698 /* 2699 * now we must check to see if we were aborted while 2700 * the move was going on and the lock/unlock 2701 * happened. 2702 */ 2703 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 2704 /* 2705 * yep it was, we leave the assoc attached 2706 * to the socket since the sctp_inpcb_free() 2707 * call will send an abort for us. 2708 */ 2709 SCTP_INP_DECR_REF(inp); 2710 return (NULL); 2711 } 2712 SCTP_INP_DECR_REF(inp); 2713 /* Switch over to the new guy */ 2714 *inp_p = inp; 2715 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2716 if (send_int_conf) { 2717 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2718 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2719 } 2720 2721 /* 2722 * Pull it from the incomplete queue and wake the 2723 * guy 2724 */ 2725 soisconnected(so); 2726 return (m); 2727 } 2728 } 2729 if (notification) { 2730 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2731 } 2732 if (send_int_conf) { 2733 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2734 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2735 } 2736 return (m); 2737 } 2738 2739 static void 2740 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED, 2741 struct sctp_tcb *stcb, struct sctp_nets *net) 2742 { 2743 /* cp must not be used, others call this without a c-ack :-) */ 2744 struct sctp_association *asoc; 2745 struct sctp_tmit_chunk *chk; 2746 2747 SCTPDBG(SCTP_DEBUG_INPUT2, 2748 "sctp_handle_cookie_ack: handling COOKIE-ACK\n"); 2749 if ((stcb == NULL) || (net == NULL)) { 2750 return; 2751 } 2752 2753 asoc = &stcb->asoc; 2754 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 2755 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 2756 asoc->overall_error_count, 2757 0, 2758 SCTP_FROM_SCTP_INPUT, 2759 __LINE__); 2760 } 2761 asoc->overall_error_count = 0; 2762 sctp_stop_all_cookie_timers(stcb); 2763 /* process according to association state */ 2764 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) { 2765 /* state change only needed when I am in right state */ 2766 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2767 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 2768 sctp_start_net_timers(stcb); 2769 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2770 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2771 stcb->sctp_ep, stcb, NULL); 2772 } 2773 /* update RTO */ 2774 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 2775 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2776 if (asoc->overall_error_count == 0) { 2777 sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, 2778 SCTP_RTT_FROM_NON_DATA); 2779 } 2780 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 2781 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2782 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2783 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 2784 sctp_pcb_add_flags(stcb->sctp_ep, SCTP_PCB_FLAGS_CONNECTED); 2785 if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) { 2786 soisconnected(stcb->sctp_socket); 2787 } 2788 } 2789 /* 2790 * since we did not send a HB make sure we don't double 2791 * things 2792 */ 2793 net->hb_responded = 1; 2794 2795 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2796 /* 2797 * We don't need to do the asconf thing, nor hb or 2798 * autoclose if the socket is closed. 2799 */ 2800 goto closed_socket; 2801 } 2802 2803 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 2804 stcb, net); 2805 2806 if (stcb->asoc.sctp_autoclose_ticks && 2807 sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2808 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 2809 stcb->sctp_ep, stcb, NULL); 2810 } 2811 /* 2812 * send ASCONF if parameters are pending and ASCONFs are 2813 * allowed (eg. addresses changed when init/cookie echo were 2814 * in flight) 2815 */ 2816 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) && 2817 (stcb->asoc.asconf_supported == 1) && 2818 (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) { 2819 #ifdef SCTP_TIMER_BASED_ASCONF 2820 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, 2821 stcb->sctp_ep, stcb, 2822 stcb->asoc.primary_destination); 2823 #else 2824 sctp_send_asconf(stcb, stcb->asoc.primary_destination, 2825 SCTP_ADDR_NOT_LOCKED); 2826 #endif 2827 } 2828 } 2829 closed_socket: 2830 /* Toss the cookie if I can */ 2831 sctp_toss_old_cookies(stcb, asoc); 2832 /* Restart the timer if we have pending data */ 2833 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) { 2834 if (chk->whoTo != NULL) { 2835 break; 2836 } 2837 } 2838 if (chk != NULL) { 2839 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 2840 } 2841 } 2842 2843 static void 2844 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp, 2845 struct sctp_tcb *stcb) 2846 { 2847 struct sctp_nets *net; 2848 struct sctp_tmit_chunk *lchk; 2849 struct sctp_ecne_chunk bkup; 2850 uint8_t override_bit; 2851 uint32_t tsn, window_data_tsn; 2852 int len; 2853 unsigned int pkt_cnt; 2854 2855 len = ntohs(cp->ch.chunk_length); 2856 if (len == sizeof(struct old_sctp_ecne_chunk)) { 2857 /* Its the old format */ 2858 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk)); 2859 bkup.num_pkts_since_cwr = htonl(1); 2860 cp = &bkup; 2861 } 2862 SCTP_STAT_INCR(sctps_recvecne); 2863 tsn = ntohl(cp->tsn); 2864 pkt_cnt = ntohl(cp->num_pkts_since_cwr); 2865 lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead); 2866 if (lchk == NULL) { 2867 window_data_tsn = stcb->asoc.sending_seq - 1; 2868 } else { 2869 window_data_tsn = lchk->rec.data.tsn; 2870 } 2871 2872 /* Find where it was sent to if possible. */ 2873 net = NULL; 2874 TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) { 2875 if (lchk->rec.data.tsn == tsn) { 2876 net = lchk->whoTo; 2877 net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send; 2878 break; 2879 } 2880 if (SCTP_TSN_GT(lchk->rec.data.tsn, tsn)) { 2881 break; 2882 } 2883 } 2884 if (net == NULL) { 2885 /* 2886 * What to do. A previous send of a CWR was possibly lost. 2887 * See how old it is, we may have it marked on the actual 2888 * net. 2889 */ 2890 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 2891 if (tsn == net->last_cwr_tsn) { 2892 /* Found him, send it off */ 2893 break; 2894 } 2895 } 2896 if (net == NULL) { 2897 /* 2898 * If we reach here, we need to send a special CWR 2899 * that says hey, we did this a long time ago and 2900 * you lost the response. 2901 */ 2902 net = TAILQ_FIRST(&stcb->asoc.nets); 2903 if (net == NULL) { 2904 /* TSNH */ 2905 return; 2906 } 2907 override_bit = SCTP_CWR_REDUCE_OVERRIDE; 2908 } else { 2909 override_bit = 0; 2910 } 2911 } else { 2912 override_bit = 0; 2913 } 2914 if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) && 2915 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 2916 /* 2917 * JRS - Use the congestion control given in the pluggable 2918 * CC module 2919 */ 2920 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt); 2921 /* 2922 * We reduce once every RTT. So we will only lower cwnd at 2923 * the next sending seq i.e. the window_data_tsn 2924 */ 2925 net->cwr_window_tsn = window_data_tsn; 2926 net->ecn_ce_pkt_cnt += pkt_cnt; 2927 net->lost_cnt = pkt_cnt; 2928 net->last_cwr_tsn = tsn; 2929 } else { 2930 override_bit |= SCTP_CWR_IN_SAME_WINDOW; 2931 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) && 2932 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 2933 /* 2934 * Another loss in the same window update how many 2935 * marks/packets lost we have had. 2936 */ 2937 int cnt = 1; 2938 2939 if (pkt_cnt > net->lost_cnt) { 2940 /* Should be the case */ 2941 cnt = (pkt_cnt - net->lost_cnt); 2942 net->ecn_ce_pkt_cnt += cnt; 2943 } 2944 net->lost_cnt = pkt_cnt; 2945 net->last_cwr_tsn = tsn; 2946 /* 2947 * Most CC functions will ignore this call, since we 2948 * are in-window yet of the initial CE the peer saw. 2949 */ 2950 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt); 2951 } 2952 } 2953 /* 2954 * We always send a CWR this way if our previous one was lost our 2955 * peer will get an update, or if it is not time again to reduce we 2956 * still get the cwr to the peer. Note we set the override when we 2957 * could not find the TSN on the chunk or the destination network. 2958 */ 2959 sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit); 2960 } 2961 2962 static void 2963 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net) 2964 { 2965 /* 2966 * Here we get a CWR from the peer. We must look in the outqueue and 2967 * make sure that we have a covered ECNE in the control chunk part. 2968 * If so remove it. 2969 */ 2970 struct sctp_tmit_chunk *chk, *nchk; 2971 struct sctp_ecne_chunk *ecne; 2972 int override; 2973 uint32_t cwr_tsn; 2974 2975 cwr_tsn = ntohl(cp->tsn); 2976 override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE; 2977 TAILQ_FOREACH_SAFE(chk, &stcb->asoc.control_send_queue, sctp_next, nchk) { 2978 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) { 2979 continue; 2980 } 2981 if ((override == 0) && (chk->whoTo != net)) { 2982 /* Must be from the right src unless override is set */ 2983 continue; 2984 } 2985 ecne = mtod(chk->data, struct sctp_ecne_chunk *); 2986 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) { 2987 /* this covers this ECNE, we can remove it */ 2988 stcb->asoc.ecn_echo_cnt_onq--; 2989 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, 2990 sctp_next); 2991 stcb->asoc.ctrl_queue_cnt--; 2992 sctp_m_freem(chk->data); 2993 chk->data = NULL; 2994 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 2995 if (override == 0) { 2996 break; 2997 } 2998 } 2999 } 3000 } 3001 3002 static void 3003 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED, 3004 struct sctp_tcb *stcb, struct sctp_nets *net) 3005 { 3006 3007 SCTPDBG(SCTP_DEBUG_INPUT2, 3008 "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n"); 3009 if (stcb == NULL) 3010 return; 3011 3012 /* process according to association state */ 3013 if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 3014 /* unexpected SHUTDOWN-COMPLETE... so ignore... */ 3015 SCTPDBG(SCTP_DEBUG_INPUT2, 3016 "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n"); 3017 SCTP_TCB_UNLOCK(stcb); 3018 return; 3019 } 3020 /* notify upper layer protocol */ 3021 if (stcb->sctp_socket) { 3022 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 3023 } 3024 #ifdef INVARIANTS 3025 if (!TAILQ_EMPTY(&stcb->asoc.send_queue) || 3026 !TAILQ_EMPTY(&stcb->asoc.sent_queue) || 3027 sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) { 3028 panic("Queues are not empty when handling SHUTDOWN-COMPLETE"); 3029 } 3030 #endif 3031 /* stop the timer */ 3032 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, 3033 SCTP_FROM_SCTP_INPUT + SCTP_LOC_24); 3034 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 3035 /* free the TCB */ 3036 SCTPDBG(SCTP_DEBUG_INPUT2, 3037 "sctp_handle_shutdown_complete: calls free-asoc\n"); 3038 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 3039 SCTP_FROM_SCTP_INPUT + SCTP_LOC_25); 3040 return; 3041 } 3042 3043 static int 3044 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc, 3045 struct sctp_nets *net, uint8_t flg) 3046 { 3047 switch (desc->chunk_type) { 3048 case SCTP_DATA: 3049 case SCTP_IDATA: 3050 /* find the tsn to resend (possibly) */ 3051 { 3052 uint32_t tsn; 3053 struct sctp_tmit_chunk *tp1; 3054 3055 tsn = ntohl(desc->tsn_ifany); 3056 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3057 if (tp1->rec.data.tsn == tsn) { 3058 /* found it */ 3059 break; 3060 } 3061 if (SCTP_TSN_GT(tp1->rec.data.tsn, tsn)) { 3062 /* not found */ 3063 tp1 = NULL; 3064 break; 3065 } 3066 } 3067 if (tp1 == NULL) { 3068 /* 3069 * Do it the other way , aka without paying 3070 * attention to queue seq order. 3071 */ 3072 SCTP_STAT_INCR(sctps_pdrpdnfnd); 3073 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3074 if (tp1->rec.data.tsn == tsn) { 3075 /* found it */ 3076 break; 3077 } 3078 } 3079 } 3080 if (tp1 == NULL) { 3081 SCTP_STAT_INCR(sctps_pdrptsnnf); 3082 } 3083 if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) { 3084 if (((flg & SCTP_BADCRC) == 0) && 3085 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3086 return (0); 3087 } 3088 if ((stcb->asoc.peers_rwnd == 0) && 3089 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3090 SCTP_STAT_INCR(sctps_pdrpdiwnp); 3091 return (0); 3092 } 3093 if (stcb->asoc.peers_rwnd == 0 && 3094 (flg & SCTP_FROM_MIDDLE_BOX)) { 3095 SCTP_STAT_INCR(sctps_pdrpdizrw); 3096 return (0); 3097 } 3098 if ((uint32_t)SCTP_BUF_LEN(tp1->data) < 3099 SCTP_DATA_CHUNK_OVERHEAD(stcb) + SCTP_NUM_DB_TO_VERIFY) { 3100 /* Payload not matching. */ 3101 SCTP_STAT_INCR(sctps_pdrpbadd); 3102 return (-1); 3103 } 3104 if (memcmp(mtod(tp1->data, caddr_t)+SCTP_DATA_CHUNK_OVERHEAD(stcb), 3105 desc->data_bytes, SCTP_NUM_DB_TO_VERIFY) != 0) { 3106 /* Payload not matching. */ 3107 SCTP_STAT_INCR(sctps_pdrpbadd); 3108 return (-1); 3109 } 3110 if (tp1->do_rtt) { 3111 /* 3112 * this guy had a RTO calculation 3113 * pending on it, cancel it 3114 */ 3115 if (tp1->whoTo->rto_needed == 0) { 3116 tp1->whoTo->rto_needed = 1; 3117 } 3118 tp1->do_rtt = 0; 3119 } 3120 SCTP_STAT_INCR(sctps_pdrpmark); 3121 if (tp1->sent != SCTP_DATAGRAM_RESEND) 3122 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3123 /* 3124 * mark it as if we were doing a FR, since 3125 * we will be getting gap ack reports behind 3126 * the info from the router. 3127 */ 3128 tp1->rec.data.doing_fast_retransmit = 1; 3129 /* 3130 * mark the tsn with what sequences can 3131 * cause a new FR. 3132 */ 3133 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) { 3134 tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq; 3135 } else { 3136 tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.tsn; 3137 } 3138 3139 /* restart the timer */ 3140 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3141 stcb, tp1->whoTo, 3142 SCTP_FROM_SCTP_INPUT + SCTP_LOC_26); 3143 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3144 stcb, tp1->whoTo); 3145 3146 /* fix counts and things */ 3147 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 3148 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP, 3149 tp1->whoTo->flight_size, 3150 tp1->book_size, 3151 (uint32_t)(uintptr_t)stcb, 3152 tp1->rec.data.tsn); 3153 } 3154 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3155 sctp_flight_size_decrease(tp1); 3156 sctp_total_flight_decrease(stcb, tp1); 3157 } 3158 tp1->sent = SCTP_DATAGRAM_RESEND; 3159 } { 3160 /* audit code */ 3161 unsigned int audit; 3162 3163 audit = 0; 3164 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3165 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3166 audit++; 3167 } 3168 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue, 3169 sctp_next) { 3170 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3171 audit++; 3172 } 3173 if (audit != stcb->asoc.sent_queue_retran_cnt) { 3174 SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n", 3175 audit, stcb->asoc.sent_queue_retran_cnt); 3176 #ifndef SCTP_AUDITING_ENABLED 3177 stcb->asoc.sent_queue_retran_cnt = audit; 3178 #endif 3179 } 3180 } 3181 } 3182 break; 3183 case SCTP_ASCONF: 3184 { 3185 struct sctp_tmit_chunk *asconf; 3186 3187 TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue, 3188 sctp_next) { 3189 if (asconf->rec.chunk_id.id == SCTP_ASCONF) { 3190 break; 3191 } 3192 } 3193 if (asconf) { 3194 if (asconf->sent != SCTP_DATAGRAM_RESEND) 3195 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3196 asconf->sent = SCTP_DATAGRAM_RESEND; 3197 asconf->snd_count--; 3198 } 3199 } 3200 break; 3201 case SCTP_INITIATION: 3202 /* resend the INIT */ 3203 stcb->asoc.dropped_special_cnt++; 3204 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) { 3205 /* 3206 * If we can get it in, in a few attempts we do 3207 * this, otherwise we let the timer fire. 3208 */ 3209 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, 3210 stcb, net, 3211 SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 3212 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 3213 } 3214 break; 3215 case SCTP_SELECTIVE_ACK: 3216 case SCTP_NR_SELECTIVE_ACK: 3217 /* resend the sack */ 3218 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED); 3219 break; 3220 case SCTP_HEARTBEAT_REQUEST: 3221 /* resend a demand HB */ 3222 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) { 3223 /* 3224 * Only retransmit if we KNOW we wont destroy the 3225 * tcb 3226 */ 3227 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 3228 } 3229 break; 3230 case SCTP_SHUTDOWN: 3231 sctp_send_shutdown(stcb, net); 3232 break; 3233 case SCTP_SHUTDOWN_ACK: 3234 sctp_send_shutdown_ack(stcb, net); 3235 break; 3236 case SCTP_COOKIE_ECHO: 3237 { 3238 struct sctp_tmit_chunk *cookie; 3239 3240 cookie = NULL; 3241 TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, 3242 sctp_next) { 3243 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) { 3244 break; 3245 } 3246 } 3247 if (cookie) { 3248 if (cookie->sent != SCTP_DATAGRAM_RESEND) 3249 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3250 cookie->sent = SCTP_DATAGRAM_RESEND; 3251 sctp_stop_all_cookie_timers(stcb); 3252 } 3253 } 3254 break; 3255 case SCTP_COOKIE_ACK: 3256 sctp_send_cookie_ack(stcb); 3257 break; 3258 case SCTP_ASCONF_ACK: 3259 /* resend last asconf ack */ 3260 sctp_send_asconf_ack(stcb); 3261 break; 3262 case SCTP_IFORWARD_CUM_TSN: 3263 case SCTP_FORWARD_CUM_TSN: 3264 send_forward_tsn(stcb, &stcb->asoc); 3265 break; 3266 /* can't do anything with these */ 3267 case SCTP_PACKET_DROPPED: 3268 case SCTP_INITIATION_ACK: /* this should not happen */ 3269 case SCTP_HEARTBEAT_ACK: 3270 case SCTP_ABORT_ASSOCIATION: 3271 case SCTP_OPERATION_ERROR: 3272 case SCTP_SHUTDOWN_COMPLETE: 3273 case SCTP_ECN_ECHO: 3274 case SCTP_ECN_CWR: 3275 default: 3276 break; 3277 } 3278 return (0); 3279 } 3280 3281 void 3282 sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list) 3283 { 3284 uint32_t i; 3285 uint16_t temp; 3286 3287 /* 3288 * We set things to 0xffffffff since this is the last delivered 3289 * sequence and we will be sending in 0 after the reset. 3290 */ 3291 3292 if (number_entries) { 3293 for (i = 0; i < number_entries; i++) { 3294 temp = ntohs(list[i]); 3295 if (temp >= stcb->asoc.streamincnt) { 3296 continue; 3297 } 3298 stcb->asoc.strmin[temp].last_mid_delivered = 0xffffffff; 3299 } 3300 } else { 3301 list = NULL; 3302 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3303 stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff; 3304 } 3305 } 3306 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3307 } 3308 3309 static void 3310 sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list) 3311 { 3312 uint32_t i; 3313 uint16_t temp; 3314 3315 if (number_entries > 0) { 3316 for (i = 0; i < number_entries; i++) { 3317 temp = ntohs(list[i]); 3318 if (temp >= stcb->asoc.streamoutcnt) { 3319 /* no such stream */ 3320 continue; 3321 } 3322 stcb->asoc.strmout[temp].next_mid_ordered = 0; 3323 stcb->asoc.strmout[temp].next_mid_unordered = 0; 3324 } 3325 } else { 3326 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3327 stcb->asoc.strmout[i].next_mid_ordered = 0; 3328 stcb->asoc.strmout[i].next_mid_unordered = 0; 3329 } 3330 } 3331 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3332 } 3333 3334 static void 3335 sctp_reset_clear_pending(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list) 3336 { 3337 uint32_t i; 3338 uint16_t temp; 3339 3340 if (number_entries > 0) { 3341 for (i = 0; i < number_entries; i++) { 3342 temp = ntohs(list[i]); 3343 if (temp >= stcb->asoc.streamoutcnt) { 3344 /* no such stream */ 3345 continue; 3346 } 3347 stcb->asoc.strmout[temp].state = SCTP_STREAM_OPEN; 3348 } 3349 } else { 3350 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3351 stcb->asoc.strmout[i].state = SCTP_STREAM_OPEN; 3352 } 3353 } 3354 } 3355 3356 struct sctp_stream_reset_request * 3357 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk) 3358 { 3359 struct sctp_association *asoc; 3360 struct sctp_chunkhdr *ch; 3361 struct sctp_stream_reset_request *r; 3362 struct sctp_tmit_chunk *chk; 3363 int len, clen; 3364 3365 asoc = &stcb->asoc; 3366 chk = asoc->str_reset; 3367 if (TAILQ_EMPTY(&asoc->control_send_queue) || 3368 (chk == NULL)) { 3369 asoc->stream_reset_outstanding = 0; 3370 return (NULL); 3371 } 3372 if (chk->data == NULL) { 3373 return (NULL); 3374 } 3375 if (bchk != NULL) { 3376 /* he wants a copy of the chk pointer */ 3377 *bchk = chk; 3378 } 3379 clen = chk->send_size; 3380 ch = mtod(chk->data, struct sctp_chunkhdr *); 3381 r = (struct sctp_stream_reset_request *)(ch + 1); 3382 if (ntohl(r->request_seq) == seq) { 3383 /* found it */ 3384 return (r); 3385 } 3386 len = SCTP_SIZE32(ntohs(r->ph.param_length)); 3387 if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) { 3388 /* move to the next one, there can only be a max of two */ 3389 r = (struct sctp_stream_reset_request *)((caddr_t)r + len); 3390 if (ntohl(r->request_seq) == seq) { 3391 return (r); 3392 } 3393 } 3394 /* that seq is not here */ 3395 return (NULL); 3396 } 3397 3398 static void 3399 sctp_clean_up_stream_reset(struct sctp_tcb *stcb) 3400 { 3401 struct sctp_association *asoc; 3402 struct sctp_tmit_chunk *chk; 3403 3404 asoc = &stcb->asoc; 3405 chk = asoc->str_reset; 3406 if (chk == NULL) { 3407 return; 3408 } 3409 asoc->str_reset = NULL; 3410 sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, 3411 NULL, SCTP_FROM_SCTP_INPUT + SCTP_LOC_28); 3412 TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next); 3413 asoc->ctrl_queue_cnt--; 3414 if (chk->data) { 3415 sctp_m_freem(chk->data); 3416 chk->data = NULL; 3417 } 3418 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3419 } 3420 3421 static int 3422 sctp_handle_stream_reset_response(struct sctp_tcb *stcb, 3423 uint32_t seq, uint32_t action, 3424 struct sctp_stream_reset_response *respin) 3425 { 3426 uint16_t type; 3427 int lparam_len; 3428 struct sctp_association *asoc = &stcb->asoc; 3429 struct sctp_tmit_chunk *chk; 3430 struct sctp_stream_reset_request *req_param; 3431 struct sctp_stream_reset_out_request *req_out_param; 3432 struct sctp_stream_reset_in_request *req_in_param; 3433 uint32_t number_entries; 3434 3435 if (asoc->stream_reset_outstanding == 0) { 3436 /* duplicate */ 3437 return (0); 3438 } 3439 if (seq == stcb->asoc.str_reset_seq_out) { 3440 req_param = sctp_find_stream_reset(stcb, seq, &chk); 3441 if (req_param != NULL) { 3442 stcb->asoc.str_reset_seq_out++; 3443 type = ntohs(req_param->ph.param_type); 3444 lparam_len = ntohs(req_param->ph.param_length); 3445 if (type == SCTP_STR_RESET_OUT_REQUEST) { 3446 int no_clear = 0; 3447 3448 req_out_param = (struct sctp_stream_reset_out_request *)req_param; 3449 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t); 3450 asoc->stream_reset_out_is_outstanding = 0; 3451 if (asoc->stream_reset_outstanding) 3452 asoc->stream_reset_outstanding--; 3453 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3454 /* do it */ 3455 sctp_reset_out_streams(stcb, number_entries, req_out_param->list_of_streams); 3456 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3457 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3458 } else if (action == SCTP_STREAM_RESET_RESULT_IN_PROGRESS) { 3459 /* 3460 * Set it up so we don't stop 3461 * retransmitting 3462 */ 3463 asoc->stream_reset_outstanding++; 3464 stcb->asoc.str_reset_seq_out--; 3465 asoc->stream_reset_out_is_outstanding = 1; 3466 no_clear = 1; 3467 } else { 3468 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3469 } 3470 if (no_clear == 0) { 3471 sctp_reset_clear_pending(stcb, number_entries, req_out_param->list_of_streams); 3472 } 3473 } else if (type == SCTP_STR_RESET_IN_REQUEST) { 3474 req_in_param = (struct sctp_stream_reset_in_request *)req_param; 3475 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t); 3476 if (asoc->stream_reset_outstanding) 3477 asoc->stream_reset_outstanding--; 3478 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3479 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb, 3480 number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3481 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3482 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb, 3483 number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3484 } 3485 } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) { 3486 /* Ok we now may have more streams */ 3487 int num_stream; 3488 3489 num_stream = stcb->asoc.strm_pending_add_size; 3490 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) { 3491 /* TSNH */ 3492 num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt; 3493 } 3494 stcb->asoc.strm_pending_add_size = 0; 3495 if (asoc->stream_reset_outstanding) 3496 asoc->stream_reset_outstanding--; 3497 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3498 /* Put the new streams into effect */ 3499 int i; 3500 3501 for (i = asoc->streamoutcnt; i < (asoc->streamoutcnt + num_stream); i++) { 3502 asoc->strmout[i].state = SCTP_STREAM_OPEN; 3503 } 3504 asoc->streamoutcnt += num_stream; 3505 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 3506 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3507 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3508 SCTP_STREAM_CHANGE_DENIED); 3509 } else { 3510 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3511 SCTP_STREAM_CHANGE_FAILED); 3512 } 3513 } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) { 3514 if (asoc->stream_reset_outstanding) 3515 asoc->stream_reset_outstanding--; 3516 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3517 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3518 SCTP_STREAM_CHANGE_DENIED); 3519 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3520 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3521 SCTP_STREAM_CHANGE_FAILED); 3522 } 3523 } else if (type == SCTP_STR_RESET_TSN_REQUEST) { 3524 /** 3525 * a) Adopt the new in tsn. 3526 * b) reset the map 3527 * c) Adopt the new out-tsn 3528 */ 3529 struct sctp_stream_reset_response_tsn *resp; 3530 struct sctp_forward_tsn_chunk fwdtsn; 3531 int abort_flag = 0; 3532 3533 if (respin == NULL) { 3534 /* huh ? */ 3535 return (0); 3536 } 3537 if (ntohs(respin->ph.param_length) < sizeof(struct sctp_stream_reset_response_tsn)) { 3538 return (0); 3539 } 3540 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3541 resp = (struct sctp_stream_reset_response_tsn *)respin; 3542 asoc->stream_reset_outstanding--; 3543 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3544 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3545 fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1); 3546 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3547 if (abort_flag) { 3548 return (1); 3549 } 3550 stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1); 3551 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3552 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3553 } 3554 3555 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 3556 stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn); 3557 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 3558 3559 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map; 3560 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size); 3561 3562 stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn); 3563 stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn; 3564 3565 sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL); 3566 sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL); 3567 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0); 3568 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3569 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3570 SCTP_ASSOC_RESET_DENIED); 3571 } else { 3572 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3573 SCTP_ASSOC_RESET_FAILED); 3574 } 3575 } 3576 /* get rid of the request and get the request flags */ 3577 if (asoc->stream_reset_outstanding == 0) { 3578 sctp_clean_up_stream_reset(stcb); 3579 } 3580 } 3581 } 3582 if (asoc->stream_reset_outstanding == 0) { 3583 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED); 3584 } 3585 return (0); 3586 } 3587 3588 static void 3589 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb, 3590 struct sctp_tmit_chunk *chk, 3591 struct sctp_stream_reset_in_request *req, int trunc) 3592 { 3593 uint32_t seq; 3594 int len, i; 3595 int number_entries; 3596 uint16_t temp; 3597 3598 /* 3599 * peer wants me to send a str-reset to him for my outgoing seq's if 3600 * seq_in is right. 3601 */ 3602 struct sctp_association *asoc = &stcb->asoc; 3603 3604 seq = ntohl(req->request_seq); 3605 if (asoc->str_reset_seq_in == seq) { 3606 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3607 if ((asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ) == 0) { 3608 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3609 } else if (trunc) { 3610 /* Can't do it, since they exceeded our buffer size */ 3611 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3612 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) { 3613 len = ntohs(req->ph.param_length); 3614 number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t)); 3615 if (number_entries) { 3616 for (i = 0; i < number_entries; i++) { 3617 temp = ntohs(req->list_of_streams[i]); 3618 if (temp >= stcb->asoc.streamoutcnt) { 3619 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3620 goto bad_boy; 3621 } 3622 req->list_of_streams[i] = temp; 3623 } 3624 for (i = 0; i < number_entries; i++) { 3625 if (stcb->asoc.strmout[req->list_of_streams[i]].state == SCTP_STREAM_OPEN) { 3626 stcb->asoc.strmout[req->list_of_streams[i]].state = SCTP_STREAM_RESET_PENDING; 3627 } 3628 } 3629 } else { 3630 /* Its all */ 3631 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3632 if (stcb->asoc.strmout[i].state == SCTP_STREAM_OPEN) 3633 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_PENDING; 3634 } 3635 } 3636 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3637 } else { 3638 /* Can't do it, since we have sent one out */ 3639 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 3640 } 3641 bad_boy: 3642 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3643 asoc->str_reset_seq_in++; 3644 } else if (asoc->str_reset_seq_in - 1 == seq) { 3645 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3646 } else if (asoc->str_reset_seq_in - 2 == seq) { 3647 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3648 } else { 3649 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3650 } 3651 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED); 3652 } 3653 3654 static int 3655 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb, 3656 struct sctp_tmit_chunk *chk, 3657 struct sctp_stream_reset_tsn_request *req) 3658 { 3659 /* reset all in and out and update the tsn */ 3660 /* 3661 * A) reset my str-seq's on in and out. B) Select a receive next, 3662 * and set cum-ack to it. Also process this selected number as a 3663 * fwd-tsn as well. C) set in the response my next sending seq. 3664 */ 3665 struct sctp_forward_tsn_chunk fwdtsn; 3666 struct sctp_association *asoc = &stcb->asoc; 3667 int abort_flag = 0; 3668 uint32_t seq; 3669 3670 seq = ntohl(req->request_seq); 3671 if (asoc->str_reset_seq_in == seq) { 3672 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3673 if ((asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ) == 0) { 3674 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3675 } else { 3676 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3677 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3678 fwdtsn.ch.chunk_flags = 0; 3679 fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1); 3680 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3681 if (abort_flag) { 3682 return (1); 3683 } 3684 asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA; 3685 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3686 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3687 } 3688 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map; 3689 asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1; 3690 memset(asoc->mapping_array, 0, asoc->mapping_array_size); 3691 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 3692 memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size); 3693 atomic_add_int(&asoc->sending_seq, 1); 3694 /* save off historical data for retrans */ 3695 asoc->last_sending_seq[1] = asoc->last_sending_seq[0]; 3696 asoc->last_sending_seq[0] = asoc->sending_seq; 3697 asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0]; 3698 asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn; 3699 sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL); 3700 sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL); 3701 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3702 sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0); 3703 } 3704 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3705 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3706 asoc->str_reset_seq_in++; 3707 } else if (asoc->str_reset_seq_in - 1 == seq) { 3708 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3709 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3710 } else if (asoc->str_reset_seq_in - 2 == seq) { 3711 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1], 3712 asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]); 3713 } else { 3714 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3715 } 3716 return (0); 3717 } 3718 3719 static void 3720 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb, 3721 struct sctp_tmit_chunk *chk, 3722 struct sctp_stream_reset_out_request *req, int trunc) 3723 { 3724 uint32_t seq, tsn; 3725 int number_entries, len; 3726 struct sctp_association *asoc = &stcb->asoc; 3727 3728 seq = ntohl(req->request_seq); 3729 3730 /* now if its not a duplicate we process it */ 3731 if (asoc->str_reset_seq_in == seq) { 3732 len = ntohs(req->ph.param_length); 3733 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t)); 3734 /* 3735 * the sender is resetting, handle the list issue.. we must 3736 * a) verify if we can do the reset, if so no problem b) If 3737 * we can't do the reset we must copy the request. c) queue 3738 * it, and setup the data in processor to trigger it off 3739 * when needed and dequeue all the queued data. 3740 */ 3741 tsn = ntohl(req->send_reset_at_tsn); 3742 3743 /* move the reset action back one */ 3744 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3745 if ((asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ) == 0) { 3746 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3747 } else if (trunc) { 3748 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3749 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) { 3750 /* we can do it now */ 3751 sctp_reset_in_stream(stcb, number_entries, req->list_of_streams); 3752 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3753 } else { 3754 /* 3755 * we must queue it up and thus wait for the TSN's 3756 * to arrive that are at or before tsn 3757 */ 3758 struct sctp_stream_reset_list *liste; 3759 int siz; 3760 3761 siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t)); 3762 SCTP_MALLOC(liste, struct sctp_stream_reset_list *, 3763 siz, SCTP_M_STRESET); 3764 if (liste == NULL) { 3765 /* gak out of memory */ 3766 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3767 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3768 return; 3769 } 3770 liste->seq = seq; 3771 liste->tsn = tsn; 3772 liste->number_entries = number_entries; 3773 memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t)); 3774 TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp); 3775 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_IN_PROGRESS; 3776 } 3777 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3778 asoc->str_reset_seq_in++; 3779 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3780 /* 3781 * one seq back, just echo back last action since my 3782 * response was lost. 3783 */ 3784 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3785 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3786 /* 3787 * two seq back, just echo back last action since my 3788 * response was lost. 3789 */ 3790 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3791 } else { 3792 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3793 } 3794 } 3795 3796 static void 3797 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 3798 struct sctp_stream_reset_add_strm *str_add) 3799 { 3800 /* 3801 * Peer is requesting to add more streams. If its within our 3802 * max-streams we will allow it. 3803 */ 3804 uint32_t num_stream, i; 3805 uint32_t seq; 3806 struct sctp_association *asoc = &stcb->asoc; 3807 struct sctp_queued_to_read *ctl, *nctl; 3808 3809 /* Get the number. */ 3810 seq = ntohl(str_add->request_seq); 3811 num_stream = ntohs(str_add->number_of_streams); 3812 /* Now what would be the new total? */ 3813 if (asoc->str_reset_seq_in == seq) { 3814 num_stream += stcb->asoc.streamincnt; 3815 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3816 if ((asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ) == 0) { 3817 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3818 } else if ((num_stream > stcb->asoc.max_inbound_streams) || 3819 (num_stream > 0xffff)) { 3820 /* We must reject it they ask for to many */ 3821 denied: 3822 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3823 } else { 3824 /* Ok, we can do that :-) */ 3825 struct sctp_stream_in *oldstrm; 3826 3827 /* save off the old */ 3828 oldstrm = stcb->asoc.strmin; 3829 SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *, 3830 (num_stream * sizeof(struct sctp_stream_in)), 3831 SCTP_M_STRMI); 3832 if (stcb->asoc.strmin == NULL) { 3833 stcb->asoc.strmin = oldstrm; 3834 goto denied; 3835 } 3836 /* copy off the old data */ 3837 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3838 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 3839 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue); 3840 stcb->asoc.strmin[i].sid = i; 3841 stcb->asoc.strmin[i].last_mid_delivered = oldstrm[i].last_mid_delivered; 3842 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started; 3843 stcb->asoc.strmin[i].pd_api_started = oldstrm[i].pd_api_started; 3844 /* now anything on those queues? */ 3845 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next_instrm, nctl) { 3846 TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next_instrm); 3847 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next_instrm); 3848 } 3849 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].uno_inqueue, next_instrm, nctl) { 3850 TAILQ_REMOVE(&oldstrm[i].uno_inqueue, ctl, next_instrm); 3851 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].uno_inqueue, ctl, next_instrm); 3852 } 3853 } 3854 /* Init the new streams */ 3855 for (i = stcb->asoc.streamincnt; i < num_stream; i++) { 3856 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 3857 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue); 3858 stcb->asoc.strmin[i].sid = i; 3859 stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff; 3860 stcb->asoc.strmin[i].pd_api_started = 0; 3861 stcb->asoc.strmin[i].delivery_started = 0; 3862 } 3863 SCTP_FREE(oldstrm, SCTP_M_STRMI); 3864 /* update the size */ 3865 stcb->asoc.streamincnt = num_stream; 3866 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3867 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 3868 } 3869 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3870 asoc->str_reset_seq_in++; 3871 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3872 /* 3873 * one seq back, just echo back last action since my 3874 * response was lost. 3875 */ 3876 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3877 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3878 /* 3879 * two seq back, just echo back last action since my 3880 * response was lost. 3881 */ 3882 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3883 } else { 3884 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3885 } 3886 } 3887 3888 static void 3889 sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 3890 struct sctp_stream_reset_add_strm *str_add) 3891 { 3892 /* 3893 * Peer is requesting to add more streams. If its within our 3894 * max-streams we will allow it. 3895 */ 3896 uint16_t num_stream; 3897 uint32_t seq; 3898 struct sctp_association *asoc = &stcb->asoc; 3899 3900 /* Get the number. */ 3901 seq = ntohl(str_add->request_seq); 3902 num_stream = ntohs(str_add->number_of_streams); 3903 /* Now what would be the new total? */ 3904 if (asoc->str_reset_seq_in == seq) { 3905 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3906 if ((asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ) == 0) { 3907 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3908 } else if (stcb->asoc.stream_reset_outstanding) { 3909 /* We must reject it we have something pending */ 3910 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 3911 } else { 3912 /* Ok, we can do that :-) */ 3913 int mychk; 3914 3915 mychk = stcb->asoc.streamoutcnt; 3916 mychk += num_stream; 3917 if (mychk < 0x10000) { 3918 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3919 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 1, num_stream, 0, 1)) { 3920 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3921 } 3922 } else { 3923 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3924 } 3925 } 3926 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]); 3927 asoc->str_reset_seq_in++; 3928 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3929 /* 3930 * one seq back, just echo back last action since my 3931 * response was lost. 3932 */ 3933 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3934 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3935 /* 3936 * two seq back, just echo back last action since my 3937 * response was lost. 3938 */ 3939 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3940 } else { 3941 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3942 } 3943 } 3944 3945 #ifdef __GNUC__ 3946 __attribute__((noinline)) 3947 #endif 3948 static int 3949 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset, 3950 struct sctp_chunkhdr *ch_req) 3951 { 3952 uint16_t remaining_length, param_len, ptype; 3953 struct sctp_paramhdr pstore; 3954 uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE]; 3955 uint32_t seq = 0; 3956 int num_req = 0; 3957 int trunc = 0; 3958 struct sctp_tmit_chunk *chk; 3959 struct sctp_chunkhdr *ch; 3960 struct sctp_paramhdr *ph; 3961 int ret_code = 0; 3962 int num_param = 0; 3963 3964 /* now it may be a reset or a reset-response */ 3965 remaining_length = ntohs(ch_req->chunk_length) - sizeof(struct sctp_chunkhdr); 3966 3967 /* setup for adding the response */ 3968 sctp_alloc_a_chunk(stcb, chk); 3969 if (chk == NULL) { 3970 return (ret_code); 3971 } 3972 chk->copy_by_ref = 0; 3973 chk->rec.chunk_id.id = SCTP_STREAM_RESET; 3974 chk->rec.chunk_id.can_take_data = 0; 3975 chk->flags = 0; 3976 chk->asoc = &stcb->asoc; 3977 chk->no_fr_allowed = 0; 3978 chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr); 3979 chk->book_size_scale = 0; 3980 chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA); 3981 if (chk->data == NULL) { 3982 strres_nochunk: 3983 if (chk->data) { 3984 sctp_m_freem(chk->data); 3985 chk->data = NULL; 3986 } 3987 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3988 return (ret_code); 3989 } 3990 SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD); 3991 3992 /* setup chunk parameters */ 3993 chk->sent = SCTP_DATAGRAM_UNSENT; 3994 chk->snd_count = 0; 3995 chk->whoTo = NULL; 3996 3997 ch = mtod(chk->data, struct sctp_chunkhdr *); 3998 ch->chunk_type = SCTP_STREAM_RESET; 3999 ch->chunk_flags = 0; 4000 ch->chunk_length = htons(chk->send_size); 4001 SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size); 4002 offset += sizeof(struct sctp_chunkhdr); 4003 while (remaining_length >= sizeof(struct sctp_paramhdr)) { 4004 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *)&pstore); 4005 if (ph == NULL) { 4006 /* TSNH */ 4007 break; 4008 } 4009 param_len = ntohs(ph->param_length); 4010 if ((param_len > remaining_length) || 4011 (param_len < (sizeof(struct sctp_paramhdr) + sizeof(uint32_t)))) { 4012 /* bad parameter length */ 4013 break; 4014 } 4015 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, sizeof(cstore)), 4016 (uint8_t *)&cstore); 4017 if (ph == NULL) { 4018 /* TSNH */ 4019 break; 4020 } 4021 ptype = ntohs(ph->param_type); 4022 num_param++; 4023 if (param_len > sizeof(cstore)) { 4024 trunc = 1; 4025 } else { 4026 trunc = 0; 4027 } 4028 if (num_param > SCTP_MAX_RESET_PARAMS) { 4029 /* hit the max of parameters already sorry.. */ 4030 break; 4031 } 4032 if (ptype == SCTP_STR_RESET_OUT_REQUEST) { 4033 struct sctp_stream_reset_out_request *req_out; 4034 4035 if (param_len < sizeof(struct sctp_stream_reset_out_request)) { 4036 break; 4037 } 4038 req_out = (struct sctp_stream_reset_out_request *)ph; 4039 num_req++; 4040 if (stcb->asoc.stream_reset_outstanding) { 4041 seq = ntohl(req_out->response_seq); 4042 if (seq == stcb->asoc.str_reset_seq_out) { 4043 /* implicit ack */ 4044 (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL); 4045 } 4046 } 4047 sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc); 4048 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) { 4049 struct sctp_stream_reset_add_strm *str_add; 4050 4051 if (param_len < sizeof(struct sctp_stream_reset_add_strm)) { 4052 break; 4053 } 4054 str_add = (struct sctp_stream_reset_add_strm *)ph; 4055 num_req++; 4056 sctp_handle_str_reset_add_strm(stcb, chk, str_add); 4057 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) { 4058 struct sctp_stream_reset_add_strm *str_add; 4059 4060 if (param_len < sizeof(struct sctp_stream_reset_add_strm)) { 4061 break; 4062 } 4063 str_add = (struct sctp_stream_reset_add_strm *)ph; 4064 num_req++; 4065 sctp_handle_str_reset_add_out_strm(stcb, chk, str_add); 4066 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) { 4067 struct sctp_stream_reset_in_request *req_in; 4068 4069 num_req++; 4070 req_in = (struct sctp_stream_reset_in_request *)ph; 4071 sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc); 4072 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) { 4073 struct sctp_stream_reset_tsn_request *req_tsn; 4074 4075 num_req++; 4076 req_tsn = (struct sctp_stream_reset_tsn_request *)ph; 4077 if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) { 4078 ret_code = 1; 4079 goto strres_nochunk; 4080 } 4081 /* no more */ 4082 break; 4083 } else if (ptype == SCTP_STR_RESET_RESPONSE) { 4084 struct sctp_stream_reset_response *resp; 4085 uint32_t result; 4086 4087 if (param_len < sizeof(struct sctp_stream_reset_response)) { 4088 break; 4089 } 4090 resp = (struct sctp_stream_reset_response *)ph; 4091 seq = ntohl(resp->response_seq); 4092 result = ntohl(resp->result); 4093 if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) { 4094 ret_code = 1; 4095 goto strres_nochunk; 4096 } 4097 } else { 4098 break; 4099 } 4100 offset += SCTP_SIZE32(param_len); 4101 if (remaining_length >= SCTP_SIZE32(param_len)) { 4102 remaining_length -= SCTP_SIZE32(param_len); 4103 } else { 4104 remaining_length = 0; 4105 } 4106 } 4107 if (num_req == 0) { 4108 /* we have no response free the stuff */ 4109 goto strres_nochunk; 4110 } 4111 /* ok we have a chunk to link in */ 4112 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, 4113 chk, 4114 sctp_next); 4115 stcb->asoc.ctrl_queue_cnt++; 4116 return (ret_code); 4117 } 4118 4119 /* 4120 * Handle a router or endpoints report of a packet loss, there are two ways 4121 * to handle this, either we get the whole packet and must disect it 4122 * ourselves (possibly with truncation and or corruption) or it is a summary 4123 * from a middle box that did the disecting for us. 4124 */ 4125 static void 4126 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp, 4127 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 4128 { 4129 struct sctp_chunk_desc desc; 4130 struct sctp_chunkhdr *chk_hdr; 4131 struct sctp_data_chunk *data_chunk; 4132 struct sctp_idata_chunk *idata_chunk; 4133 uint32_t bottle_bw, on_queue; 4134 uint32_t offset, chk_len; 4135 uint16_t pktdrp_len; 4136 uint8_t pktdrp_flags; 4137 4138 KASSERT(sizeof(struct sctp_pktdrop_chunk) <= limit, 4139 ("PKTDROP chunk too small")); 4140 pktdrp_flags = cp->ch.chunk_flags; 4141 pktdrp_len = ntohs(cp->ch.chunk_length); 4142 KASSERT(limit <= pktdrp_len, ("Inconsistent limit")); 4143 if (pktdrp_flags & SCTP_PACKET_TRUNCATED) { 4144 if (ntohs(cp->trunc_len) <= pktdrp_len - sizeof(struct sctp_pktdrop_chunk)) { 4145 /* The peer plays games with us. */ 4146 return; 4147 } 4148 } 4149 limit -= sizeof(struct sctp_pktdrop_chunk); 4150 offset = 0; 4151 if (offset == limit) { 4152 if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) { 4153 SCTP_STAT_INCR(sctps_pdrpbwrpt); 4154 } 4155 } else if (offset + sizeof(struct sctphdr) > limit) { 4156 /* Only a partial SCTP common header. */ 4157 SCTP_STAT_INCR(sctps_pdrpcrupt); 4158 offset = limit; 4159 } else { 4160 /* XXX: Check embedded SCTP common header. */ 4161 offset += sizeof(struct sctphdr); 4162 } 4163 /* Now parse through the chunks themselves. */ 4164 while (offset < limit) { 4165 if (offset + sizeof(struct sctp_chunkhdr) > limit) { 4166 SCTP_STAT_INCR(sctps_pdrpcrupt); 4167 break; 4168 } 4169 chk_hdr = (struct sctp_chunkhdr *)(cp->data + offset); 4170 desc.chunk_type = chk_hdr->chunk_type; 4171 /* get amount we need to move */ 4172 chk_len = (uint32_t)ntohs(chk_hdr->chunk_length); 4173 if (chk_len < sizeof(struct sctp_chunkhdr)) { 4174 /* Someone is lying... */ 4175 break; 4176 } 4177 if (desc.chunk_type == SCTP_DATA) { 4178 if (stcb->asoc.idata_supported) { 4179 /* Some is playing games with us. */ 4180 break; 4181 } 4182 if (chk_len <= sizeof(struct sctp_data_chunk)) { 4183 /* Some is playing games with us. */ 4184 break; 4185 } 4186 if (chk_len < sizeof(struct sctp_data_chunk) + SCTP_NUM_DB_TO_VERIFY) { 4187 /* 4188 * Not enough data bytes available in the 4189 * chunk. 4190 */ 4191 SCTP_STAT_INCR(sctps_pdrpnedat); 4192 goto next_chunk; 4193 } 4194 if (offset + sizeof(struct sctp_data_chunk) + SCTP_NUM_DB_TO_VERIFY > limit) { 4195 /* Not enough data in buffer. */ 4196 break; 4197 } 4198 data_chunk = (struct sctp_data_chunk *)(cp->data + offset); 4199 memcpy(desc.data_bytes, data_chunk + 1, SCTP_NUM_DB_TO_VERIFY); 4200 desc.tsn_ifany = data_chunk->dp.tsn; 4201 if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) { 4202 SCTP_STAT_INCR(sctps_pdrpmbda); 4203 } 4204 } else if (desc.chunk_type == SCTP_IDATA) { 4205 if (!stcb->asoc.idata_supported) { 4206 /* Some is playing games with us. */ 4207 break; 4208 } 4209 if (chk_len <= sizeof(struct sctp_idata_chunk)) { 4210 /* Some is playing games with us. */ 4211 break; 4212 } 4213 if (chk_len < sizeof(struct sctp_idata_chunk) + SCTP_NUM_DB_TO_VERIFY) { 4214 /* 4215 * Not enough data bytes available in the 4216 * chunk. 4217 */ 4218 SCTP_STAT_INCR(sctps_pdrpnedat); 4219 goto next_chunk; 4220 } 4221 if (offset + sizeof(struct sctp_idata_chunk) + SCTP_NUM_DB_TO_VERIFY > limit) { 4222 /* Not enough data in buffer. */ 4223 break; 4224 } 4225 idata_chunk = (struct sctp_idata_chunk *)(cp->data + offset); 4226 memcpy(desc.data_bytes, idata_chunk + 1, SCTP_NUM_DB_TO_VERIFY); 4227 desc.tsn_ifany = idata_chunk->dp.tsn; 4228 if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) { 4229 SCTP_STAT_INCR(sctps_pdrpmbda); 4230 } 4231 } else { 4232 if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) { 4233 SCTP_STAT_INCR(sctps_pdrpmbct); 4234 } 4235 } 4236 if (process_chunk_drop(stcb, &desc, net, pktdrp_flags)) { 4237 SCTP_STAT_INCR(sctps_pdrppdbrk); 4238 break; 4239 } 4240 next_chunk: 4241 offset += SCTP_SIZE32(chk_len); 4242 } 4243 /* Now update any rwnd --- possibly */ 4244 if ((pktdrp_flags & SCTP_FROM_MIDDLE_BOX) == 0) { 4245 /* From a peer, we get a rwnd report */ 4246 uint32_t a_rwnd; 4247 4248 SCTP_STAT_INCR(sctps_pdrpfehos); 4249 4250 bottle_bw = ntohl(cp->bottle_bw); 4251 on_queue = ntohl(cp->current_onq); 4252 if (bottle_bw && on_queue) { 4253 /* a rwnd report is in here */ 4254 if (bottle_bw > on_queue) 4255 a_rwnd = bottle_bw - on_queue; 4256 else 4257 a_rwnd = 0; 4258 4259 if (a_rwnd == 0) 4260 stcb->asoc.peers_rwnd = 0; 4261 else { 4262 if (a_rwnd > stcb->asoc.total_flight) { 4263 stcb->asoc.peers_rwnd = 4264 a_rwnd - stcb->asoc.total_flight; 4265 } else { 4266 stcb->asoc.peers_rwnd = 0; 4267 } 4268 if (stcb->asoc.peers_rwnd < 4269 stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 4270 /* SWS sender side engages */ 4271 stcb->asoc.peers_rwnd = 0; 4272 } 4273 } 4274 } 4275 } else { 4276 SCTP_STAT_INCR(sctps_pdrpfmbox); 4277 } 4278 4279 /* now middle boxes in sat networks get a cwnd bump */ 4280 if ((pktdrp_flags & SCTP_FROM_MIDDLE_BOX) && 4281 (stcb->asoc.sat_t3_loss_recovery == 0) && 4282 (stcb->asoc.sat_network)) { 4283 /* 4284 * This is debatable but for sat networks it makes sense 4285 * Note if a T3 timer has went off, we will prohibit any 4286 * changes to cwnd until we exit the t3 loss recovery. 4287 */ 4288 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb, 4289 net, cp, &bottle_bw, &on_queue); 4290 } 4291 } 4292 4293 /* 4294 * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to 4295 * still contain IP/SCTP header - stcb: is the tcb found for this packet - 4296 * offset: offset into the mbuf chain to first chunkhdr - length: is the 4297 * length of the complete packet outputs: - length: modified to remaining 4298 * length after control processing - netp: modified to new sctp_nets after 4299 * cookie-echo processing - return NULL to discard the packet (ie. no asoc, 4300 * bad packet,...) otherwise return the tcb for this packet 4301 */ 4302 #ifdef __GNUC__ 4303 __attribute__((noinline)) 4304 #endif 4305 static struct sctp_tcb * 4306 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length, 4307 struct sockaddr *src, struct sockaddr *dst, 4308 struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp, 4309 struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen, 4310 uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum, 4311 uint32_t vrf_id, uint16_t port) 4312 { 4313 struct sctp_association *asoc; 4314 struct mbuf *op_err; 4315 char msg[SCTP_DIAG_INFO_LEN]; 4316 uint32_t vtag_in; 4317 int num_chunks = 0; /* number of control chunks processed */ 4318 uint32_t chk_length, contiguous; 4319 int ret; 4320 int abort_no_unlock = 0; 4321 int ecne_seen = 0; 4322 int abort_flag; 4323 4324 /* 4325 * How big should this be, and should it be alloc'd? Lets try the 4326 * d-mtu-ceiling for now (2k) and that should hopefully work ... 4327 * until we get into jumbo grams and such.. 4328 */ 4329 uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE]; 4330 int got_auth = 0; 4331 uint32_t auth_offset = 0, auth_len = 0; 4332 int auth_skipped = 0; 4333 int asconf_cnt = 0; 4334 4335 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n", 4336 iphlen, *offset, length, (void *)stcb); 4337 4338 if (stcb) { 4339 SCTP_TCB_LOCK_ASSERT(stcb); 4340 } 4341 /* validate chunk header length... */ 4342 if (ntohs(ch->chunk_length) < sizeof(*ch)) { 4343 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n", 4344 ntohs(ch->chunk_length)); 4345 *offset = length; 4346 return (stcb); 4347 } 4348 /* 4349 * validate the verification tag 4350 */ 4351 vtag_in = ntohl(sh->v_tag); 4352 4353 if (ch->chunk_type == SCTP_INITIATION) { 4354 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n", 4355 ntohs(ch->chunk_length), vtag_in); 4356 if (vtag_in != 0) { 4357 /* protocol error- silently discard... */ 4358 SCTP_STAT_INCR(sctps_badvtag); 4359 if (stcb != NULL) { 4360 SCTP_TCB_UNLOCK(stcb); 4361 } 4362 return (NULL); 4363 } 4364 } else if (ch->chunk_type != SCTP_COOKIE_ECHO) { 4365 /* 4366 * If there is no stcb, skip the AUTH chunk and process 4367 * later after a stcb is found (to validate the lookup was 4368 * valid. 4369 */ 4370 if ((ch->chunk_type == SCTP_AUTHENTICATION) && 4371 (stcb == NULL) && 4372 (inp->auth_supported == 1)) { 4373 /* save this chunk for later processing */ 4374 auth_skipped = 1; 4375 auth_offset = *offset; 4376 auth_len = ntohs(ch->chunk_length); 4377 4378 /* (temporarily) move past this chunk */ 4379 *offset += SCTP_SIZE32(auth_len); 4380 if (*offset >= length) { 4381 /* no more data left in the mbuf chain */ 4382 *offset = length; 4383 return (NULL); 4384 } 4385 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4386 sizeof(struct sctp_chunkhdr), chunk_buf); 4387 } 4388 if (ch == NULL) { 4389 /* Help */ 4390 *offset = length; 4391 return (stcb); 4392 } 4393 if (ch->chunk_type == SCTP_COOKIE_ECHO) { 4394 goto process_control_chunks; 4395 } 4396 /* 4397 * first check if it's an ASCONF with an unknown src addr we 4398 * need to look inside to find the association 4399 */ 4400 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) { 4401 struct sctp_chunkhdr *asconf_ch = ch; 4402 uint32_t asconf_offset = 0, asconf_len = 0; 4403 4404 /* inp's refcount may be reduced */ 4405 SCTP_INP_INCR_REF(inp); 4406 4407 asconf_offset = *offset; 4408 do { 4409 asconf_len = ntohs(asconf_ch->chunk_length); 4410 if (asconf_len < sizeof(struct sctp_asconf_paramhdr)) 4411 break; 4412 stcb = sctp_findassociation_ep_asconf(m, 4413 *offset, 4414 dst, 4415 sh, &inp, netp, vrf_id); 4416 if (stcb != NULL) 4417 break; 4418 asconf_offset += SCTP_SIZE32(asconf_len); 4419 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset, 4420 sizeof(struct sctp_chunkhdr), chunk_buf); 4421 } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF); 4422 if (stcb == NULL) { 4423 /* 4424 * reduce inp's refcount if not reduced in 4425 * sctp_findassociation_ep_asconf(). 4426 */ 4427 SCTP_INP_DECR_REF(inp); 4428 } 4429 4430 /* now go back and verify any auth chunk to be sure */ 4431 if (auth_skipped && (stcb != NULL)) { 4432 struct sctp_auth_chunk *auth; 4433 4434 if (auth_len <= SCTP_CHUNK_BUFFER_SIZE) { 4435 auth = (struct sctp_auth_chunk *)sctp_m_getptr(m, auth_offset, auth_len, chunk_buf); 4436 got_auth = 1; 4437 auth_skipped = 0; 4438 } else { 4439 auth = NULL; 4440 } 4441 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, 4442 auth_offset)) { 4443 /* auth HMAC failed so dump it */ 4444 *offset = length; 4445 return (stcb); 4446 } else { 4447 /* remaining chunks are HMAC checked */ 4448 stcb->asoc.authenticated = 1; 4449 } 4450 } 4451 } 4452 if (stcb == NULL) { 4453 SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 4454 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4455 msg); 4456 /* no association, so it's out of the blue... */ 4457 sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, op_err, 4458 mflowtype, mflowid, inp->fibnum, 4459 vrf_id, port); 4460 *offset = length; 4461 return (NULL); 4462 } 4463 asoc = &stcb->asoc; 4464 /* ABORT and SHUTDOWN can use either v_tag... */ 4465 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) || 4466 (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) || 4467 (ch->chunk_type == SCTP_PACKET_DROPPED)) { 4468 /* Take the T-bit always into account. */ 4469 if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) && 4470 (vtag_in == asoc->my_vtag)) || 4471 (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) && 4472 (asoc->peer_vtag != htonl(0)) && 4473 (vtag_in == asoc->peer_vtag))) { 4474 /* this is valid */ 4475 } else { 4476 /* drop this packet... */ 4477 SCTP_STAT_INCR(sctps_badvtag); 4478 if (stcb != NULL) { 4479 SCTP_TCB_UNLOCK(stcb); 4480 } 4481 return (NULL); 4482 } 4483 } else { 4484 /* for all other chunks, vtag must match */ 4485 if (vtag_in != asoc->my_vtag) { 4486 /* invalid vtag... */ 4487 SCTPDBG(SCTP_DEBUG_INPUT3, 4488 "invalid vtag: %xh, expect %xh\n", 4489 vtag_in, asoc->my_vtag); 4490 SCTP_STAT_INCR(sctps_badvtag); 4491 if (stcb != NULL) { 4492 SCTP_TCB_UNLOCK(stcb); 4493 } 4494 *offset = length; 4495 return (NULL); 4496 } 4497 } 4498 } /* end if !SCTP_COOKIE_ECHO */ 4499 /* 4500 * process all control chunks... 4501 */ 4502 if (((ch->chunk_type == SCTP_SELECTIVE_ACK) || 4503 (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) || 4504 (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) && 4505 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 4506 /* implied cookie-ack.. we must have lost the ack */ 4507 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, 4508 *netp); 4509 } 4510 4511 process_control_chunks: 4512 while (IS_SCTP_CONTROL(ch)) { 4513 /* validate chunk length */ 4514 chk_length = ntohs(ch->chunk_length); 4515 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n", 4516 ch->chunk_type, chk_length); 4517 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length); 4518 if (chk_length < sizeof(*ch) || 4519 (*offset + (int)chk_length) > length) { 4520 *offset = length; 4521 return (stcb); 4522 } 4523 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks); 4524 /* 4525 * INIT and INIT-ACK only gets the init ack "header" portion 4526 * only because we don't have to process the peer's COOKIE. 4527 * All others get a complete chunk. 4528 */ 4529 switch (ch->chunk_type) { 4530 case SCTP_INITIATION: 4531 contiguous = sizeof(struct sctp_init_chunk); 4532 break; 4533 case SCTP_INITIATION_ACK: 4534 contiguous = sizeof(struct sctp_init_ack_chunk); 4535 break; 4536 default: 4537 contiguous = min(chk_length, sizeof(chunk_buf)); 4538 break; 4539 } 4540 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4541 contiguous, 4542 chunk_buf); 4543 if (ch == NULL) { 4544 *offset = length; 4545 return (stcb); 4546 } 4547 4548 num_chunks++; 4549 /* Save off the last place we got a control from */ 4550 if (stcb != NULL) { 4551 if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) { 4552 /* 4553 * allow last_control to be NULL if 4554 * ASCONF... ASCONF processing will find the 4555 * right net later 4556 */ 4557 if ((netp != NULL) && (*netp != NULL)) 4558 stcb->asoc.last_control_chunk_from = *netp; 4559 } 4560 } 4561 #ifdef SCTP_AUDITING_ENABLED 4562 sctp_audit_log(0xB0, ch->chunk_type); 4563 #endif 4564 4565 /* check to see if this chunk required auth, but isn't */ 4566 if ((stcb != NULL) && 4567 sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) && 4568 !stcb->asoc.authenticated) { 4569 /* "silently" ignore */ 4570 SCTP_STAT_INCR(sctps_recvauthmissing); 4571 goto next_chunk; 4572 } 4573 switch (ch->chunk_type) { 4574 case SCTP_INITIATION: 4575 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n"); 4576 /* The INIT chunk must be the only chunk. */ 4577 if ((num_chunks > 1) || 4578 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4579 /* 4580 * RFC 4960bis requires stopping the 4581 * processing of the packet. 4582 */ 4583 *offset = length; 4584 return (stcb); 4585 } 4586 /* Honor our resource limit. */ 4587 if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) { 4588 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 4589 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err, 4590 mflowtype, mflowid, inp->fibnum, 4591 vrf_id, port); 4592 *offset = length; 4593 if (stcb != NULL) { 4594 SCTP_TCB_UNLOCK(stcb); 4595 } 4596 return (NULL); 4597 } 4598 sctp_handle_init(m, iphlen, *offset, src, dst, sh, 4599 (struct sctp_init_chunk *)ch, inp, 4600 stcb, *netp, 4601 mflowtype, mflowid, 4602 vrf_id, port); 4603 *offset = length; 4604 if (stcb != NULL) { 4605 SCTP_TCB_UNLOCK(stcb); 4606 } 4607 return (NULL); 4608 break; 4609 case SCTP_PAD_CHUNK: 4610 break; 4611 case SCTP_INITIATION_ACK: 4612 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT_ACK\n"); 4613 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4614 /* We are not interested anymore */ 4615 if ((stcb != NULL) && (stcb->asoc.total_output_queue_size)) { 4616 ; 4617 } else { 4618 *offset = length; 4619 if (stcb != NULL) { 4620 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 4621 SCTP_FROM_SCTP_INPUT + SCTP_LOC_29); 4622 } 4623 return (NULL); 4624 } 4625 } 4626 /* The INIT-ACK chunk must be the only chunk. */ 4627 if ((num_chunks > 1) || 4628 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4629 *offset = length; 4630 return (stcb); 4631 } 4632 if ((netp != NULL) && (*netp != NULL)) { 4633 ret = sctp_handle_init_ack(m, iphlen, *offset, 4634 src, dst, sh, 4635 (struct sctp_init_ack_chunk *)ch, 4636 stcb, *netp, 4637 &abort_no_unlock, 4638 mflowtype, mflowid, 4639 vrf_id); 4640 } else { 4641 ret = -1; 4642 } 4643 *offset = length; 4644 if (abort_no_unlock) { 4645 return (NULL); 4646 } 4647 /* 4648 * Special case, I must call the output routine to 4649 * get the cookie echoed 4650 */ 4651 if ((stcb != NULL) && (ret == 0)) { 4652 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 4653 } 4654 return (stcb); 4655 break; 4656 case SCTP_SELECTIVE_ACK: 4657 case SCTP_NR_SELECTIVE_ACK: 4658 { 4659 int abort_now = 0; 4660 uint32_t a_rwnd, cum_ack; 4661 uint16_t num_seg, num_nr_seg, num_dup; 4662 uint8_t flags; 4663 int offset_seg, offset_dup; 4664 4665 SCTPDBG(SCTP_DEBUG_INPUT3, "%s\n", 4666 ch->chunk_type == SCTP_SELECTIVE_ACK ? "SCTP_SACK" : "SCTP_NR_SACK"); 4667 SCTP_STAT_INCR(sctps_recvsacks); 4668 if (stcb == NULL) { 4669 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing %s chunk\n", 4670 (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK"); 4671 break; 4672 } 4673 if (ch->chunk_type == SCTP_SELECTIVE_ACK) { 4674 if (chk_length < sizeof(struct sctp_sack_chunk)) { 4675 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n"); 4676 break; 4677 } 4678 } else { 4679 if (stcb->asoc.nrsack_supported == 0) { 4680 goto unknown_chunk; 4681 } 4682 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) { 4683 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR_SACK chunk, too small\n"); 4684 break; 4685 } 4686 } 4687 if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4688 /*- 4689 * If we have sent a shutdown-ack, we will pay no 4690 * attention to a sack sent in to us since 4691 * we don't care anymore. 4692 */ 4693 break; 4694 } 4695 flags = ch->chunk_flags; 4696 if (ch->chunk_type == SCTP_SELECTIVE_ACK) { 4697 struct sctp_sack_chunk *sack; 4698 4699 sack = (struct sctp_sack_chunk *)ch; 4700 cum_ack = ntohl(sack->sack.cum_tsn_ack); 4701 num_seg = ntohs(sack->sack.num_gap_ack_blks); 4702 num_nr_seg = 0; 4703 num_dup = ntohs(sack->sack.num_dup_tsns); 4704 a_rwnd = ntohl(sack->sack.a_rwnd); 4705 if (sizeof(struct sctp_sack_chunk) + 4706 num_seg * sizeof(struct sctp_gap_ack_block) + 4707 num_dup * sizeof(uint32_t) != chk_length) { 4708 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n"); 4709 break; 4710 } 4711 offset_seg = *offset + sizeof(struct sctp_sack_chunk); 4712 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 4713 } else { 4714 struct sctp_nr_sack_chunk *nr_sack; 4715 4716 nr_sack = (struct sctp_nr_sack_chunk *)ch; 4717 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack); 4718 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks); 4719 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks); 4720 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns); 4721 a_rwnd = ntohl(nr_sack->nr_sack.a_rwnd); 4722 if (sizeof(struct sctp_nr_sack_chunk) + 4723 (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) + 4724 num_dup * sizeof(uint32_t) != chk_length) { 4725 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n"); 4726 break; 4727 } 4728 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk); 4729 offset_dup = offset_seg + (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block); 4730 } 4731 SCTPDBG(SCTP_DEBUG_INPUT3, "%s process cum_ack:%x num_seg:%d a_rwnd:%d\n", 4732 (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK", 4733 cum_ack, num_seg, a_rwnd); 4734 stcb->asoc.seen_a_sack_this_pkt = 1; 4735 if ((stcb->asoc.pr_sctp_cnt == 0) && 4736 (num_seg == 0) && (num_nr_seg == 0) && 4737 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 4738 (stcb->asoc.saw_sack_with_frags == 0) && 4739 (stcb->asoc.saw_sack_with_nr_frags == 0) && 4740 (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) { 4741 /* 4742 * We have a SIMPLE sack having no 4743 * prior segments and data on sent 4744 * queue to be acked. Use the faster 4745 * path sack processing. We also 4746 * allow window update sacks with no 4747 * missing segments to go this way 4748 * too. 4749 */ 4750 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, 4751 &abort_now, ecne_seen); 4752 } else { 4753 if ((netp != NULL) && (*netp != NULL)) { 4754 sctp_handle_sack(m, offset_seg, offset_dup, stcb, 4755 num_seg, num_nr_seg, num_dup, &abort_now, flags, 4756 cum_ack, a_rwnd, ecne_seen); 4757 } 4758 } 4759 if (abort_now) { 4760 /* ABORT signal from sack processing */ 4761 *offset = length; 4762 return (NULL); 4763 } 4764 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 4765 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 4766 (stcb->asoc.stream_queue_cnt == 0)) { 4767 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 4768 } 4769 break; 4770 } 4771 case SCTP_HEARTBEAT_REQUEST: 4772 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n"); 4773 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 4774 SCTP_STAT_INCR(sctps_recvheartbeat); 4775 sctp_send_heartbeat_ack(stcb, m, *offset, 4776 chk_length, *netp); 4777 } 4778 break; 4779 case SCTP_HEARTBEAT_ACK: 4780 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT_ACK\n"); 4781 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) { 4782 /* Its not ours */ 4783 break; 4784 } 4785 SCTP_STAT_INCR(sctps_recvheartbeatack); 4786 if ((netp != NULL) && (*netp != NULL)) { 4787 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch, 4788 stcb, *netp); 4789 } 4790 break; 4791 case SCTP_ABORT_ASSOCIATION: 4792 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n", 4793 (void *)stcb); 4794 *offset = length; 4795 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 4796 if (sctp_handle_abort((struct sctp_abort_chunk *)ch, stcb, *netp)) { 4797 return (NULL); 4798 } else { 4799 return (stcb); 4800 } 4801 } else { 4802 return (NULL); 4803 } 4804 break; 4805 case SCTP_SHUTDOWN: 4806 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n", 4807 (void *)stcb); 4808 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) { 4809 break; 4810 } 4811 if ((netp != NULL) && (*netp != NULL)) { 4812 abort_flag = 0; 4813 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch, 4814 stcb, *netp, &abort_flag); 4815 if (abort_flag) { 4816 *offset = length; 4817 return (NULL); 4818 } 4819 } 4820 break; 4821 case SCTP_SHUTDOWN_ACK: 4822 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_ACK, stcb %p\n", (void *)stcb); 4823 if ((chk_length == sizeof(struct sctp_shutdown_ack_chunk)) && 4824 (stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 4825 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp); 4826 *offset = length; 4827 return (NULL); 4828 } 4829 break; 4830 case SCTP_OPERATION_ERROR: 4831 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP_ERR\n"); 4832 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL) && 4833 sctp_handle_error(ch, stcb, *netp, contiguous) < 0) { 4834 *offset = length; 4835 return (NULL); 4836 } 4837 break; 4838 case SCTP_COOKIE_ECHO: 4839 SCTPDBG(SCTP_DEBUG_INPUT3, 4840 "SCTP_COOKIE_ECHO, stcb %p\n", (void *)stcb); 4841 if ((stcb != NULL) && (stcb->asoc.total_output_queue_size > 0)) { 4842 ; 4843 } else { 4844 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4845 /* We are not interested anymore */ 4846 abend: 4847 if (stcb != NULL) { 4848 SCTP_TCB_UNLOCK(stcb); 4849 } 4850 *offset = length; 4851 return (NULL); 4852 } 4853 } 4854 /*- 4855 * First are we accepting? We do this again here 4856 * since it is possible that a previous endpoint WAS 4857 * listening responded to a INIT-ACK and then 4858 * closed. We opened and bound.. and are now no 4859 * longer listening. 4860 * 4861 * XXXGL: notes on checking listen queue length. 4862 * 1) SCTP_IS_LISTENING() doesn't necessarily mean 4863 * SOLISTENING(), because a listening "UDP type" 4864 * socket isn't listening in terms of the socket 4865 * layer. It is a normal data flow socket, that 4866 * can fork off new connections. Thus, we should 4867 * look into sol_qlen only in case we are !UDP. 4868 * 2) Checking sol_qlen in general requires locking 4869 * the socket, and this code lacks that. 4870 */ 4871 if ((stcb == NULL) && 4872 (!SCTP_IS_LISTENING(inp) || 4873 (((inp->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE) == 0) && 4874 inp->sctp_socket->sol_qlen >= inp->sctp_socket->sol_qlimit))) { 4875 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 4876 (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) { 4877 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 4878 sctp_abort_association(inp, stcb, m, iphlen, 4879 src, dst, sh, op_err, 4880 mflowtype, mflowid, 4881 vrf_id, port); 4882 } 4883 *offset = length; 4884 return (NULL); 4885 } else { 4886 struct mbuf *ret_buf; 4887 struct sctp_inpcb *linp; 4888 struct sctp_tmit_chunk *chk; 4889 4890 if (inp->sctp_flags & (SCTP_PCB_FLAGS_SOCKET_GONE | 4891 SCTP_PCB_FLAGS_SOCKET_ALLGONE)) { 4892 goto abend; 4893 } 4894 4895 if (stcb) { 4896 linp = NULL; 4897 } else { 4898 linp = inp; 4899 } 4900 4901 if (linp != NULL) { 4902 SCTP_ASOC_CREATE_LOCK(linp); 4903 } 4904 4905 if (netp != NULL) { 4906 struct sctp_tcb *locked_stcb; 4907 4908 locked_stcb = stcb; 4909 ret_buf = 4910 sctp_handle_cookie_echo(m, iphlen, 4911 *offset, 4912 src, dst, 4913 sh, 4914 (struct sctp_cookie_echo_chunk *)ch, 4915 &inp, &stcb, netp, 4916 auth_skipped, 4917 auth_offset, 4918 auth_len, 4919 &locked_stcb, 4920 mflowtype, 4921 mflowid, 4922 vrf_id, 4923 port); 4924 if ((locked_stcb != NULL) && (locked_stcb != stcb)) { 4925 SCTP_TCB_UNLOCK(locked_stcb); 4926 } 4927 if (stcb != NULL) { 4928 SCTP_TCB_LOCK_ASSERT(stcb); 4929 } 4930 } else { 4931 ret_buf = NULL; 4932 } 4933 if (linp != NULL) { 4934 SCTP_ASOC_CREATE_UNLOCK(linp); 4935 } 4936 if (ret_buf == NULL) { 4937 if (stcb != NULL) { 4938 SCTP_TCB_UNLOCK(stcb); 4939 } 4940 SCTPDBG(SCTP_DEBUG_INPUT3, 4941 "GAK, null buffer\n"); 4942 *offset = length; 4943 return (NULL); 4944 } 4945 /* if AUTH skipped, see if it verified... */ 4946 if (auth_skipped) { 4947 got_auth = 1; 4948 auth_skipped = 0; 4949 } 4950 /* Restart the timer if we have pending data */ 4951 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 4952 if (chk->whoTo != NULL) { 4953 break; 4954 } 4955 } 4956 if (chk != NULL) { 4957 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 4958 } 4959 } 4960 break; 4961 case SCTP_COOKIE_ACK: 4962 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE_ACK, stcb %p\n", (void *)stcb); 4963 if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) { 4964 break; 4965 } 4966 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4967 /* We are not interested anymore */ 4968 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4969 ; 4970 } else if (stcb) { 4971 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 4972 SCTP_FROM_SCTP_INPUT + SCTP_LOC_30); 4973 *offset = length; 4974 return (NULL); 4975 } 4976 } 4977 if ((netp != NULL) && (*netp != NULL)) { 4978 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp); 4979 } 4980 break; 4981 case SCTP_ECN_ECHO: 4982 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_ECHO\n"); 4983 if (stcb == NULL) { 4984 break; 4985 } 4986 if (stcb->asoc.ecn_supported == 0) { 4987 goto unknown_chunk; 4988 } 4989 if ((chk_length != sizeof(struct sctp_ecne_chunk)) && 4990 (chk_length != sizeof(struct old_sctp_ecne_chunk))) { 4991 break; 4992 } 4993 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, stcb); 4994 ecne_seen = 1; 4995 break; 4996 case SCTP_ECN_CWR: 4997 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_CWR\n"); 4998 if (stcb == NULL) { 4999 break; 5000 } 5001 if (stcb->asoc.ecn_supported == 0) { 5002 goto unknown_chunk; 5003 } 5004 if (chk_length != sizeof(struct sctp_cwr_chunk)) { 5005 break; 5006 } 5007 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp); 5008 break; 5009 case SCTP_SHUTDOWN_COMPLETE: 5010 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_COMPLETE, stcb %p\n", (void *)stcb); 5011 /* must be first and only chunk */ 5012 if ((num_chunks > 1) || 5013 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 5014 *offset = length; 5015 return (stcb); 5016 } 5017 if ((chk_length == sizeof(struct sctp_shutdown_complete_chunk)) && 5018 (stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 5019 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch, 5020 stcb, *netp); 5021 *offset = length; 5022 return (NULL); 5023 } 5024 break; 5025 case SCTP_ASCONF: 5026 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n"); 5027 if (stcb != NULL) { 5028 if (stcb->asoc.asconf_supported == 0) { 5029 goto unknown_chunk; 5030 } 5031 sctp_handle_asconf(m, *offset, src, 5032 (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0); 5033 asconf_cnt++; 5034 } 5035 break; 5036 case SCTP_ASCONF_ACK: 5037 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF_ACK\n"); 5038 if (stcb == NULL) { 5039 break; 5040 } 5041 if (stcb->asoc.asconf_supported == 0) { 5042 goto unknown_chunk; 5043 } 5044 if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) { 5045 break; 5046 } 5047 if ((netp != NULL) && (*netp != NULL)) { 5048 /* He's alive so give him credit */ 5049 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5050 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5051 stcb->asoc.overall_error_count, 5052 0, 5053 SCTP_FROM_SCTP_INPUT, 5054 __LINE__); 5055 } 5056 stcb->asoc.overall_error_count = 0; 5057 sctp_handle_asconf_ack(m, *offset, 5058 (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock); 5059 if (abort_no_unlock) 5060 return (NULL); 5061 } 5062 break; 5063 case SCTP_FORWARD_CUM_TSN: 5064 case SCTP_IFORWARD_CUM_TSN: 5065 SCTPDBG(SCTP_DEBUG_INPUT3, "%s\n", 5066 ch->chunk_type == SCTP_FORWARD_CUM_TSN ? "FORWARD_TSN" : "I_FORWARD_TSN"); 5067 if (stcb == NULL) { 5068 break; 5069 } 5070 if (stcb->asoc.prsctp_supported == 0) { 5071 goto unknown_chunk; 5072 } 5073 if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) { 5074 break; 5075 } 5076 if (((stcb->asoc.idata_supported == 1) && (ch->chunk_type == SCTP_FORWARD_CUM_TSN)) || 5077 ((stcb->asoc.idata_supported == 0) && (ch->chunk_type == SCTP_IFORWARD_CUM_TSN))) { 5078 if (ch->chunk_type == SCTP_FORWARD_CUM_TSN) { 5079 SCTP_SNPRINTF(msg, sizeof(msg), "%s", "FORWARD-TSN chunk received when I-FORWARD-TSN was negotiated"); 5080 } else { 5081 SCTP_SNPRINTF(msg, sizeof(msg), "%s", "I-FORWARD-TSN chunk received when FORWARD-TSN was negotiated"); 5082 } 5083 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); 5084 sctp_abort_an_association(inp, stcb, op_err, false, SCTP_SO_NOT_LOCKED); 5085 *offset = length; 5086 return (NULL); 5087 } 5088 *fwd_tsn_seen = 1; 5089 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5090 /* We are not interested anymore */ 5091 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 5092 SCTP_FROM_SCTP_INPUT + SCTP_LOC_31); 5093 *offset = length; 5094 return (NULL); 5095 } 5096 /* 5097 * For sending a SACK this looks like DATA chunks. 5098 */ 5099 stcb->asoc.last_data_chunk_from = stcb->asoc.last_control_chunk_from; 5100 abort_flag = 0; 5101 sctp_handle_forward_tsn(stcb, 5102 (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset); 5103 if (abort_flag) { 5104 *offset = length; 5105 return (NULL); 5106 } 5107 break; 5108 case SCTP_STREAM_RESET: 5109 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n"); 5110 if (stcb == NULL) { 5111 break; 5112 } 5113 if (stcb->asoc.reconfig_supported == 0) { 5114 goto unknown_chunk; 5115 } 5116 if (chk_length < sizeof(struct sctp_stream_reset_tsn_req)) { 5117 break; 5118 } 5119 if (sctp_handle_stream_reset(stcb, m, *offset, ch)) { 5120 /* stop processing */ 5121 *offset = length; 5122 return (NULL); 5123 } 5124 break; 5125 case SCTP_PACKET_DROPPED: 5126 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n"); 5127 if (stcb == NULL) { 5128 break; 5129 } 5130 if (stcb->asoc.pktdrop_supported == 0) { 5131 goto unknown_chunk; 5132 } 5133 if (chk_length < sizeof(struct sctp_pktdrop_chunk)) { 5134 break; 5135 } 5136 if ((netp != NULL) && (*netp != NULL)) { 5137 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch, 5138 stcb, *netp, 5139 min(chk_length, contiguous)); 5140 } 5141 break; 5142 case SCTP_AUTHENTICATION: 5143 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n"); 5144 if (stcb == NULL) { 5145 /* save the first AUTH for later processing */ 5146 if (auth_skipped == 0) { 5147 auth_offset = *offset; 5148 auth_len = chk_length; 5149 auth_skipped = 1; 5150 } 5151 /* skip this chunk (temporarily) */ 5152 break; 5153 } 5154 if (stcb->asoc.auth_supported == 0) { 5155 goto unknown_chunk; 5156 } 5157 if ((chk_length < (sizeof(struct sctp_auth_chunk))) || 5158 (chk_length > (sizeof(struct sctp_auth_chunk) + 5159 SCTP_AUTH_DIGEST_LEN_MAX))) { 5160 /* Its not ours */ 5161 *offset = length; 5162 return (stcb); 5163 } 5164 if (got_auth == 1) { 5165 /* skip this chunk... it's already auth'd */ 5166 break; 5167 } 5168 got_auth = 1; 5169 if (sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch, m, *offset)) { 5170 /* auth HMAC failed so dump the packet */ 5171 *offset = length; 5172 return (stcb); 5173 } else { 5174 /* remaining chunks are HMAC checked */ 5175 stcb->asoc.authenticated = 1; 5176 } 5177 break; 5178 5179 default: 5180 unknown_chunk: 5181 /* it's an unknown chunk! */ 5182 if ((ch->chunk_type & 0x40) && 5183 (stcb != NULL) && 5184 (SCTP_GET_STATE(stcb) != SCTP_STATE_EMPTY) && 5185 (SCTP_GET_STATE(stcb) != SCTP_STATE_INUSE) && 5186 (SCTP_GET_STATE(stcb) != SCTP_STATE_COOKIE_WAIT)) { 5187 struct sctp_gen_error_cause *cause; 5188 int len; 5189 5190 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_gen_error_cause), 5191 0, M_NOWAIT, 1, MT_DATA); 5192 if (op_err != NULL) { 5193 len = min(SCTP_SIZE32(chk_length), (uint32_t)(length - *offset)); 5194 cause = mtod(op_err, struct sctp_gen_error_cause *); 5195 cause->code = htons(SCTP_CAUSE_UNRECOG_CHUNK); 5196 cause->length = htons((uint16_t)(len + sizeof(struct sctp_gen_error_cause))); 5197 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_gen_error_cause); 5198 SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(m, *offset, len, M_NOWAIT); 5199 if (SCTP_BUF_NEXT(op_err) != NULL) { 5200 #ifdef SCTP_MBUF_LOGGING 5201 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5202 sctp_log_mbc(SCTP_BUF_NEXT(op_err), SCTP_MBUF_ICOPY); 5203 } 5204 #endif 5205 sctp_queue_op_err(stcb, op_err); 5206 } else { 5207 sctp_m_freem(op_err); 5208 } 5209 } 5210 } 5211 if ((ch->chunk_type & 0x80) == 0) { 5212 /* discard this packet */ 5213 *offset = length; 5214 return (stcb); 5215 } /* else skip this bad chunk and continue... */ 5216 break; 5217 } /* switch (ch->chunk_type) */ 5218 5219 next_chunk: 5220 /* get the next chunk */ 5221 *offset += SCTP_SIZE32(chk_length); 5222 if (*offset >= length) { 5223 /* no more data left in the mbuf chain */ 5224 break; 5225 } 5226 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 5227 sizeof(struct sctp_chunkhdr), chunk_buf); 5228 if (ch == NULL) { 5229 *offset = length; 5230 return (stcb); 5231 } 5232 } /* while */ 5233 5234 if ((asconf_cnt > 0) && (stcb != NULL)) { 5235 sctp_send_asconf_ack(stcb); 5236 } 5237 return (stcb); 5238 } 5239 5240 /* 5241 * common input chunk processing (v4 and v6) 5242 */ 5243 void 5244 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length, 5245 struct sockaddr *src, struct sockaddr *dst, 5246 struct sctphdr *sh, struct sctp_chunkhdr *ch, 5247 uint8_t compute_crc, 5248 uint8_t ecn_bits, 5249 uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum, 5250 uint32_t vrf_id, uint16_t port) 5251 { 5252 char msg[SCTP_DIAG_INFO_LEN]; 5253 struct mbuf *m = *mm, *op_err; 5254 struct sctp_inpcb *inp = NULL, *inp_decr = NULL; 5255 struct sctp_tcb *stcb = NULL; 5256 struct sctp_nets *net = NULL; 5257 uint32_t high_tsn; 5258 uint32_t cksum_in_hdr; 5259 int un_sent; 5260 int cnt_ctrl_ready = 0; 5261 int fwd_tsn_seen = 0, data_processed = 0; 5262 bool cksum_validated, stcb_looked_up; 5263 5264 SCTP_STAT_INCR(sctps_recvdatagrams); 5265 #ifdef SCTP_AUDITING_ENABLED 5266 sctp_audit_log(0xE0, 1); 5267 sctp_auditing(0, inp, stcb, net); 5268 #endif 5269 5270 stcb_looked_up = false; 5271 if (compute_crc != 0) { 5272 cksum_validated = false; 5273 cksum_in_hdr = sh->checksum; 5274 if (cksum_in_hdr != htonl(0)) { 5275 uint32_t cksum_calculated; 5276 5277 validate_cksum: 5278 sh->checksum = 0; 5279 cksum_calculated = sctp_calculate_cksum(m, iphlen); 5280 sh->checksum = cksum_in_hdr; 5281 if (cksum_calculated != cksum_in_hdr) { 5282 if (stcb_looked_up) { 5283 /* 5284 * The packet has a zero checksum, 5285 * which is not the correct CRC, no 5286 * stcb has been found or an stcb 5287 * has been found but an incorrect 5288 * zero checksum is not acceptable. 5289 */ 5290 KASSERT(cksum_in_hdr == htonl(0), 5291 ("cksum in header not zero: %x", 5292 ntohl(cksum_in_hdr))); 5293 if ((inp == NULL) && 5294 (SCTP_BASE_SYSCTL(sctp_ootb_with_zero_cksum) == 1)) { 5295 /* 5296 * This is an OOTB packet, 5297 * depending on the sysctl 5298 * variable, pretend that 5299 * the checksum is 5300 * acceptable, to allow an 5301 * appropriate response 5302 * (ABORT, for examlpe) to 5303 * be sent. 5304 */ 5305 KASSERT(stcb == NULL, 5306 ("stcb is %p", stcb)); 5307 SCTP_STAT_INCR(sctps_recvzerocrc); 5308 goto cksum_validated; 5309 } 5310 } else { 5311 stcb = sctp_findassociation_addr(m, offset, src, dst, 5312 sh, ch, &inp, &net, vrf_id); 5313 } 5314 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad cksum in SCTP packet:%x calculated:%x m:%p mlen:%d iphlen:%d\n", 5315 ntohl(cksum_in_hdr), ntohl(cksum_calculated), (void *)m, length, iphlen); 5316 #if defined(INET) || defined(INET6) 5317 if ((ch->chunk_type != SCTP_INITIATION) && 5318 (net != NULL) && (net->port != port)) { 5319 if (net->port == 0) { 5320 /* 5321 * UDP encapsulation turned 5322 * on. 5323 */ 5324 net->mtu -= sizeof(struct udphdr); 5325 if (stcb->asoc.smallest_mtu > net->mtu) { 5326 sctp_pathmtu_adjustment(stcb, net->mtu, true); 5327 } 5328 } else if (port == 0) { 5329 /* 5330 * UDP encapsulation turned 5331 * off. 5332 */ 5333 net->mtu += sizeof(struct udphdr); 5334 /* XXX Update smallest_mtu */ 5335 } 5336 net->port = port; 5337 } 5338 #endif 5339 if (net != NULL) { 5340 net->flowtype = mflowtype; 5341 net->flowid = mflowid; 5342 } 5343 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5344 if ((inp != NULL) && (stcb != NULL)) { 5345 if (stcb->asoc.pktdrop_supported) { 5346 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1); 5347 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED); 5348 } 5349 } else if ((inp != NULL) && (stcb == NULL)) { 5350 inp_decr = inp; 5351 } 5352 SCTP_STAT_INCR(sctps_badsum); 5353 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors); 5354 goto out; 5355 } else { 5356 cksum_validated = true; 5357 } 5358 } 5359 KASSERT(cksum_validated || cksum_in_hdr == htonl(0), 5360 ("cksum 0x%08x not zero and not validated", ntohl(cksum_in_hdr))); 5361 if (!cksum_validated) { 5362 stcb = sctp_findassociation_addr(m, offset, src, dst, 5363 sh, ch, &inp, &net, vrf_id); 5364 stcb_looked_up = true; 5365 if ((stcb == NULL) || (stcb->asoc.zero_checksum == 0)) { 5366 goto validate_cksum; 5367 } 5368 SCTP_STAT_INCR(sctps_recvzerocrc); 5369 } 5370 } 5371 cksum_validated: 5372 /* Destination port of 0 is illegal, based on RFC4960. */ 5373 if (sh->dest_port == htons(0)) { 5374 SCTP_STAT_INCR(sctps_hdrops); 5375 if ((stcb == NULL) && (inp != NULL)) { 5376 inp_decr = inp; 5377 } 5378 goto out; 5379 } 5380 if (!stcb_looked_up) { 5381 stcb = sctp_findassociation_addr(m, offset, src, dst, 5382 sh, ch, &inp, &net, vrf_id); 5383 } 5384 #if defined(INET) || defined(INET6) 5385 if ((ch->chunk_type != SCTP_INITIATION) && 5386 (net != NULL) && (net->port != port)) { 5387 if (net->port == 0) { 5388 /* UDP encapsulation turned on. */ 5389 net->mtu -= sizeof(struct udphdr); 5390 if (stcb->asoc.smallest_mtu > net->mtu) { 5391 sctp_pathmtu_adjustment(stcb, net->mtu, true); 5392 } 5393 } else if (port == 0) { 5394 /* UDP encapsulation turned off. */ 5395 net->mtu += sizeof(struct udphdr); 5396 /* XXX Update smallest_mtu */ 5397 } 5398 net->port = port; 5399 } 5400 #endif 5401 if (net != NULL) { 5402 net->flowtype = mflowtype; 5403 net->flowid = mflowid; 5404 } 5405 if (inp == NULL) { 5406 SCTP_STAT_INCR(sctps_noport); 5407 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5408 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) { 5409 goto out; 5410 } 5411 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 5412 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks); 5413 sctp_send_shutdown_complete2(src, dst, sh, 5414 mflowtype, mflowid, fibnum, 5415 vrf_id, port); 5416 goto out; 5417 } 5418 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) { 5419 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks); 5420 goto out; 5421 } 5422 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) { 5423 if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) || 5424 ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) && 5425 (ch->chunk_type != SCTP_INIT))) { 5426 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5427 "Out of the blue"); 5428 sctp_send_abort(m, iphlen, src, dst, 5429 sh, 0, op_err, 5430 mflowtype, mflowid, fibnum, 5431 vrf_id, port); 5432 } 5433 } 5434 goto out; 5435 } else if (stcb == NULL) { 5436 inp_decr = inp; 5437 } 5438 SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n", 5439 (void *)m, iphlen, offset, length, (void *)stcb); 5440 if (stcb) { 5441 /* always clear this before beginning a packet */ 5442 stcb->asoc.authenticated = 0; 5443 stcb->asoc.seen_a_sack_this_pkt = 0; 5444 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n", 5445 (void *)stcb, stcb->asoc.state); 5446 5447 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) || 5448 (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) { 5449 /*- 5450 * If we hit here, we had a ref count 5451 * up when the assoc was aborted and the 5452 * timer is clearing out the assoc, we should 5453 * NOT respond to any packet.. its OOTB. 5454 */ 5455 SCTP_TCB_UNLOCK(stcb); 5456 stcb = NULL; 5457 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5458 SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5459 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5460 msg); 5461 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5462 mflowtype, mflowid, inp->fibnum, 5463 vrf_id, port); 5464 goto out; 5465 } 5466 } 5467 if (IS_SCTP_CONTROL(ch)) { 5468 /* process the control portion of the SCTP packet */ 5469 /* sa_ignore NO_NULL_CHK */ 5470 stcb = sctp_process_control(m, iphlen, &offset, length, 5471 src, dst, sh, ch, 5472 inp, stcb, &net, &fwd_tsn_seen, 5473 mflowtype, mflowid, fibnum, 5474 vrf_id, port); 5475 if (stcb) { 5476 /* 5477 * This covers us if the cookie-echo was there and 5478 * it changes our INP. 5479 */ 5480 inp = stcb->sctp_ep; 5481 #if defined(INET) || defined(INET6) 5482 if ((ch->chunk_type != SCTP_INITIATION) && 5483 (net != NULL) && (net->port != port)) { 5484 if (net->port == 0) { 5485 /* UDP encapsulation turned on. */ 5486 net->mtu -= sizeof(struct udphdr); 5487 if (stcb->asoc.smallest_mtu > net->mtu) { 5488 sctp_pathmtu_adjustment(stcb, net->mtu, true); 5489 } 5490 } else if (port == 0) { 5491 /* UDP encapsulation turned off. */ 5492 net->mtu += sizeof(struct udphdr); 5493 /* XXX Update smallest_mtu */ 5494 } 5495 net->port = port; 5496 } 5497 #endif 5498 } 5499 } else { 5500 /* 5501 * no control chunks, so pre-process DATA chunks (these 5502 * checks are taken care of by control processing) 5503 */ 5504 5505 /* 5506 * if DATA only packet, and auth is required, then punt... 5507 * can't have authenticated without any AUTH (control) 5508 * chunks 5509 */ 5510 if ((stcb != NULL) && 5511 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) { 5512 /* "silently" ignore */ 5513 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5514 SCTP_STAT_INCR(sctps_recvauthmissing); 5515 goto out; 5516 } 5517 if (stcb == NULL) { 5518 /* out of the blue DATA chunk */ 5519 SCTP_PROBE5(receive, NULL, NULL, m, NULL, sh); 5520 SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5521 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5522 msg); 5523 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5524 mflowtype, mflowid, fibnum, 5525 vrf_id, port); 5526 goto out; 5527 } 5528 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) { 5529 /* v_tag mismatch! */ 5530 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5531 SCTP_STAT_INCR(sctps_badvtag); 5532 goto out; 5533 } 5534 } 5535 5536 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5537 if (stcb == NULL) { 5538 /* 5539 * no valid TCB for this packet, or we found it's a bad 5540 * packet while processing control, or we're done with this 5541 * packet (done or skip rest of data), so we drop it... 5542 */ 5543 goto out; 5544 } 5545 5546 /* 5547 * DATA chunk processing 5548 */ 5549 /* plow through the data chunks while length > offset */ 5550 5551 /* 5552 * Rest should be DATA only. Check authentication state if AUTH for 5553 * DATA is required. 5554 */ 5555 if ((length > offset) && 5556 (stcb != NULL) && 5557 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) && 5558 !stcb->asoc.authenticated) { 5559 /* "silently" ignore */ 5560 SCTP_STAT_INCR(sctps_recvauthmissing); 5561 SCTPDBG(SCTP_DEBUG_AUTH1, 5562 "Data chunk requires AUTH, skipped\n"); 5563 goto trigger_send; 5564 } 5565 if (length > offset) { 5566 int retval; 5567 5568 /* 5569 * First check to make sure our state is correct. We would 5570 * not get here unless we really did have a tag, so we don't 5571 * abort if this happens, just dump the chunk silently. 5572 */ 5573 switch (SCTP_GET_STATE(stcb)) { 5574 case SCTP_STATE_COOKIE_ECHOED: 5575 /* 5576 * we consider data with valid tags in this state 5577 * shows us the cookie-ack was lost. Imply it was 5578 * there. 5579 */ 5580 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net); 5581 break; 5582 case SCTP_STATE_COOKIE_WAIT: 5583 /* 5584 * We consider OOTB any data sent during asoc setup. 5585 */ 5586 SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5587 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5588 msg); 5589 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5590 mflowtype, mflowid, inp->fibnum, 5591 vrf_id, port); 5592 goto out; 5593 /* sa_ignore NOTREACHED */ 5594 break; 5595 case SCTP_STATE_EMPTY: /* should not happen */ 5596 case SCTP_STATE_INUSE: /* should not happen */ 5597 case SCTP_STATE_SHUTDOWN_RECEIVED: /* This is a peer error */ 5598 case SCTP_STATE_SHUTDOWN_ACK_SENT: 5599 default: 5600 goto out; 5601 /* sa_ignore NOTREACHED */ 5602 break; 5603 case SCTP_STATE_OPEN: 5604 case SCTP_STATE_SHUTDOWN_SENT: 5605 break; 5606 } 5607 /* plow through the data chunks while length > offset */ 5608 retval = sctp_process_data(mm, iphlen, &offset, length, 5609 inp, stcb, net, &high_tsn); 5610 if (retval == 2) { 5611 /* 5612 * The association aborted, NO UNLOCK needed since 5613 * the association is destroyed. 5614 */ 5615 stcb = NULL; 5616 goto out; 5617 } 5618 if (retval == 0) { 5619 data_processed = 1; 5620 } 5621 /* 5622 * Anything important needs to have been m_copy'ed in 5623 * process_data 5624 */ 5625 } 5626 5627 /* take care of ecn */ 5628 if ((data_processed == 1) && 5629 (stcb->asoc.ecn_supported == 1) && 5630 ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) { 5631 /* Yep, we need to add a ECNE */ 5632 sctp_send_ecn_echo(stcb, net, high_tsn); 5633 } 5634 5635 if ((data_processed == 0) && (fwd_tsn_seen)) { 5636 int was_a_gap; 5637 uint32_t highest_tsn; 5638 5639 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) { 5640 highest_tsn = stcb->asoc.highest_tsn_inside_nr_map; 5641 } else { 5642 highest_tsn = stcb->asoc.highest_tsn_inside_map; 5643 } 5644 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn); 5645 stcb->asoc.send_sack = 1; 5646 sctp_sack_check(stcb, was_a_gap); 5647 } else if (fwd_tsn_seen) { 5648 stcb->asoc.send_sack = 1; 5649 } 5650 /* trigger send of any chunks in queue... */ 5651 trigger_send: 5652 #ifdef SCTP_AUDITING_ENABLED 5653 sctp_audit_log(0xE0, 2); 5654 sctp_auditing(1, inp, stcb, net); 5655 #endif 5656 SCTPDBG(SCTP_DEBUG_INPUT1, 5657 "Check for chunk output prw:%d tqe:%d tf=%d\n", 5658 stcb->asoc.peers_rwnd, 5659 TAILQ_EMPTY(&stcb->asoc.control_send_queue), 5660 stcb->asoc.total_flight); 5661 un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight); 5662 if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 5663 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq; 5664 } 5665 if (!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue) || 5666 cnt_ctrl_ready || 5667 stcb->asoc.trigger_reset || 5668 ((un_sent > 0) && 5669 (stcb->asoc.peers_rwnd > 0 || stcb->asoc.total_flight == 0))) { 5670 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n"); 5671 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 5672 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n"); 5673 } 5674 #ifdef SCTP_AUDITING_ENABLED 5675 sctp_audit_log(0xE0, 3); 5676 sctp_auditing(2, inp, stcb, net); 5677 #endif 5678 out: 5679 if (stcb != NULL) { 5680 SCTP_TCB_UNLOCK(stcb); 5681 } 5682 if (inp_decr != NULL) { 5683 /* reduce ref-count */ 5684 SCTP_INP_WLOCK(inp_decr); 5685 SCTP_INP_DECR_REF(inp_decr); 5686 SCTP_INP_WUNLOCK(inp_decr); 5687 } 5688 return; 5689 } 5690 5691 #ifdef INET 5692 void 5693 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port) 5694 { 5695 struct mbuf *m; 5696 int iphlen; 5697 uint32_t vrf_id = 0; 5698 uint8_t ecn_bits; 5699 struct sockaddr_in src, dst; 5700 struct ip *ip; 5701 struct sctphdr *sh; 5702 struct sctp_chunkhdr *ch; 5703 int length, offset; 5704 uint8_t compute_crc; 5705 uint32_t mflowid; 5706 uint8_t mflowtype; 5707 uint16_t fibnum; 5708 5709 iphlen = off; 5710 if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) { 5711 SCTP_RELEASE_PKT(i_pak); 5712 return; 5713 } 5714 m = SCTP_HEADER_TO_CHAIN(i_pak); 5715 #ifdef SCTP_MBUF_LOGGING 5716 /* Log in any input mbufs */ 5717 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5718 sctp_log_mbc(m, SCTP_MBUF_INPUT); 5719 } 5720 #endif 5721 #ifdef SCTP_PACKET_LOGGING 5722 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) { 5723 sctp_packet_log(m); 5724 } 5725 #endif 5726 SCTPDBG(SCTP_DEBUG_CRCOFFLOAD, 5727 "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n", 5728 m->m_pkthdr.len, 5729 if_name(m->m_pkthdr.rcvif), 5730 (int)m->m_pkthdr.csum_flags, CSUM_BITS); 5731 mflowid = m->m_pkthdr.flowid; 5732 mflowtype = M_HASHTYPE_GET(m); 5733 fibnum = M_GETFIB(m); 5734 SCTP_STAT_INCR(sctps_recvpackets); 5735 SCTP_STAT_INCR_COUNTER64(sctps_inpackets); 5736 /* Get IP, SCTP, and first chunk header together in the first mbuf. */ 5737 offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr); 5738 if (SCTP_BUF_LEN(m) < offset) { 5739 if ((m = m_pullup(m, offset)) == NULL) { 5740 SCTP_STAT_INCR(sctps_hdrops); 5741 return; 5742 } 5743 } 5744 ip = mtod(m, struct ip *); 5745 sh = (struct sctphdr *)((caddr_t)ip + iphlen); 5746 ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr)); 5747 offset -= sizeof(struct sctp_chunkhdr); 5748 memset(&src, 0, sizeof(struct sockaddr_in)); 5749 src.sin_family = AF_INET; 5750 src.sin_len = sizeof(struct sockaddr_in); 5751 src.sin_port = sh->src_port; 5752 src.sin_addr = ip->ip_src; 5753 memset(&dst, 0, sizeof(struct sockaddr_in)); 5754 dst.sin_family = AF_INET; 5755 dst.sin_len = sizeof(struct sockaddr_in); 5756 dst.sin_port = sh->dest_port; 5757 dst.sin_addr = ip->ip_dst; 5758 length = ntohs(ip->ip_len); 5759 /* Validate mbuf chain length with IP payload length. */ 5760 if (SCTP_HEADER_LEN(m) != length) { 5761 SCTPDBG(SCTP_DEBUG_INPUT1, 5762 "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m)); 5763 SCTP_STAT_INCR(sctps_hdrops); 5764 goto out; 5765 } 5766 /* SCTP does not allow broadcasts or multicasts */ 5767 if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) { 5768 goto out; 5769 } 5770 if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) { 5771 goto out; 5772 } 5773 ecn_bits = ip->ip_tos; 5774 if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) { 5775 SCTP_STAT_INCR(sctps_recvhwcrc); 5776 compute_crc = 0; 5777 } else { 5778 SCTP_STAT_INCR(sctps_recvswcrc); 5779 compute_crc = 1; 5780 } 5781 sctp_common_input_processing(&m, iphlen, offset, length, 5782 (struct sockaddr *)&src, 5783 (struct sockaddr *)&dst, 5784 sh, ch, 5785 compute_crc, 5786 ecn_bits, 5787 mflowtype, mflowid, fibnum, 5788 vrf_id, port); 5789 out: 5790 if (m) { 5791 sctp_m_freem(m); 5792 } 5793 return; 5794 } 5795 5796 #if defined(SCTP_MCORE_INPUT) && defined(SMP) 5797 extern int *sctp_cpuarry; 5798 #endif 5799 5800 int 5801 sctp_input(struct mbuf **mp, int *offp, int proto SCTP_UNUSED) 5802 { 5803 struct mbuf *m; 5804 int off; 5805 5806 m = *mp; 5807 off = *offp; 5808 #if defined(SCTP_MCORE_INPUT) && defined(SMP) 5809 if (mp_ncpus > 1) { 5810 struct ip *ip; 5811 struct sctphdr *sh; 5812 int offset; 5813 int cpu_to_use; 5814 uint32_t flowid, tag; 5815 5816 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) { 5817 flowid = m->m_pkthdr.flowid; 5818 } else { 5819 /* 5820 * No flow id built by lower layers fix it so we 5821 * create one. 5822 */ 5823 offset = off + sizeof(struct sctphdr); 5824 if (SCTP_BUF_LEN(m) < offset) { 5825 if ((m = m_pullup(m, offset)) == NULL) { 5826 SCTP_STAT_INCR(sctps_hdrops); 5827 return (IPPROTO_DONE); 5828 } 5829 } 5830 ip = mtod(m, struct ip *); 5831 sh = (struct sctphdr *)((caddr_t)ip + off); 5832 tag = htonl(sh->v_tag); 5833 flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port); 5834 m->m_pkthdr.flowid = flowid; 5835 M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE_HASH); 5836 } 5837 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus]; 5838 sctp_queue_to_mcore(m, off, cpu_to_use); 5839 return (IPPROTO_DONE); 5840 } 5841 #endif 5842 sctp_input_with_port(m, off, 0); 5843 return (IPPROTO_DONE); 5844 } 5845 #endif 5846