1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved. 5 * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved. 6 * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions are met: 10 * 11 * a) Redistributions of source code must retain the above copyright notice, 12 * this list of conditions and the following disclaimer. 13 * 14 * b) Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in 16 * the documentation and/or other materials provided with the distribution. 17 * 18 * c) Neither the name of Cisco Systems, Inc. nor the names of its 19 * contributors may be used to endorse or promote products derived 20 * from this software without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 23 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 24 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 26 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 28 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 29 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 30 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 31 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 32 * THE POSSIBILITY OF SUCH DAMAGE. 33 */ 34 35 #include <sys/cdefs.h> 36 __FBSDID("$FreeBSD$"); 37 38 #include <netinet/sctp_os.h> 39 #include <netinet/sctp_var.h> 40 #include <netinet/sctp_sysctl.h> 41 #include <netinet/sctp_pcb.h> 42 #include <netinet/sctp_header.h> 43 #include <netinet/sctputil.h> 44 #include <netinet/sctp_output.h> 45 #include <netinet/sctp_input.h> 46 #include <netinet/sctp_auth.h> 47 #include <netinet/sctp_indata.h> 48 #include <netinet/sctp_asconf.h> 49 #include <netinet/sctp_bsd_addr.h> 50 #include <netinet/sctp_timer.h> 51 #include <netinet/sctp_crc32.h> 52 #include <netinet/sctp_kdtrace.h> 53 #if defined(INET) || defined(INET6) 54 #include <netinet/udp.h> 55 #endif 56 #include <sys/smp.h> 57 58 static void 59 sctp_stop_all_cookie_timers(struct sctp_tcb *stcb) 60 { 61 struct sctp_nets *net; 62 63 /* 64 * This now not only stops all cookie timers it also stops any INIT 65 * timers as well. This will make sure that the timers are stopped 66 * in all collision cases. 67 */ 68 SCTP_TCB_LOCK_ASSERT(stcb); 69 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 70 if (net->rxt_timer.type == SCTP_TIMER_TYPE_COOKIE) { 71 sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE, 72 stcb->sctp_ep, 73 stcb, 74 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_1); 75 } else if (net->rxt_timer.type == SCTP_TIMER_TYPE_INIT) { 76 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, 77 stcb->sctp_ep, 78 stcb, 79 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_2); 80 } 81 } 82 } 83 84 /* INIT handler */ 85 static void 86 sctp_handle_init(struct mbuf *m, int iphlen, int offset, 87 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 88 struct sctp_init_chunk *cp, struct sctp_inpcb *inp, 89 struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_no_unlock, 90 uint8_t mflowtype, uint32_t mflowid, 91 uint32_t vrf_id, uint16_t port) 92 { 93 struct sctp_init *init; 94 struct mbuf *op_err; 95 96 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_init: handling INIT tcb:%p\n", 97 (void *)stcb); 98 if (stcb == NULL) { 99 SCTP_INP_RLOCK(inp); 100 } 101 /* Validate parameters */ 102 init = &cp->init; 103 if ((ntohl(init->initiate_tag) == 0) || 104 (ntohl(init->a_rwnd) < SCTP_MIN_RWND) || 105 (ntohs(init->num_inbound_streams) == 0) || 106 (ntohs(init->num_outbound_streams) == 0)) { 107 /* protocol error... send abort */ 108 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 109 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 110 mflowtype, mflowid, 111 vrf_id, port); 112 if (stcb) 113 *abort_no_unlock = 1; 114 goto outnow; 115 } 116 if (sctp_validate_init_auth_params(m, offset + sizeof(*cp), 117 offset + ntohs(cp->ch.chunk_length))) { 118 /* auth parameter(s) error... send abort */ 119 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 120 "Problem with AUTH parameters"); 121 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 122 mflowtype, mflowid, 123 vrf_id, port); 124 if (stcb) 125 *abort_no_unlock = 1; 126 goto outnow; 127 } 128 /* We are only accepting if we have a listening socket. */ 129 if ((stcb == NULL) && 130 ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 131 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) || 132 (!SCTP_IS_LISTENING(inp)))) { 133 /* 134 * FIX ME ?? What about TCP model and we have a 135 * match/restart case? Actually no fix is needed. the lookup 136 * will always find the existing assoc so stcb would not be 137 * NULL. It may be questionable to do this since we COULD 138 * just send back the INIT-ACK and hope that the app did 139 * accept()'s by the time the COOKIE was sent. But there is 140 * a price to pay for COOKIE generation and I don't want to 141 * pay it on the chance that the app will actually do some 142 * accepts(). The App just looses and should NOT be in this 143 * state :-) 144 */ 145 if (SCTP_BASE_SYSCTL(sctp_blackhole) == 0) { 146 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 147 "No listener"); 148 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err, 149 mflowtype, mflowid, inp->fibnum, 150 vrf_id, port); 151 } 152 goto outnow; 153 } 154 if ((stcb != NULL) && 155 (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT)) { 156 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending SHUTDOWN-ACK\n"); 157 sctp_send_shutdown_ack(stcb, NULL); 158 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 159 } else { 160 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n"); 161 sctp_send_initiate_ack(inp, stcb, net, m, iphlen, offset, 162 src, dst, sh, cp, 163 mflowtype, mflowid, 164 vrf_id, port); 165 } 166 outnow: 167 if (stcb == NULL) { 168 SCTP_INP_RUNLOCK(inp); 169 } 170 } 171 172 /* 173 * process peer "INIT/INIT-ACK" chunk returns value < 0 on error 174 */ 175 176 int 177 sctp_is_there_unsent_data(struct sctp_tcb *stcb, int so_locked) 178 { 179 int unsent_data; 180 unsigned int i; 181 struct sctp_stream_queue_pending *sp; 182 struct sctp_association *asoc; 183 184 /* 185 * This function returns if any stream has true unsent data on it. 186 * Note that as it looks through it will clean up any places that 187 * have old data that has been sent but left at top of stream queue. 188 */ 189 asoc = &stcb->asoc; 190 unsent_data = 0; 191 SCTP_TCB_SEND_LOCK(stcb); 192 if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 193 /* Check to see if some data queued */ 194 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 195 /* sa_ignore FREED_MEMORY */ 196 sp = TAILQ_FIRST(&stcb->asoc.strmout[i].outqueue); 197 if (sp == NULL) { 198 continue; 199 } 200 if ((sp->msg_is_complete) && 201 (sp->length == 0) && 202 (sp->sender_all_done)) { 203 /* 204 * We are doing differed cleanup. Last time 205 * through when we took all the data the 206 * sender_all_done was not set. 207 */ 208 if (sp->put_last_out == 0) { 209 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n"); 210 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n", 211 sp->sender_all_done, 212 sp->length, 213 sp->msg_is_complete, 214 sp->put_last_out); 215 } 216 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1); 217 TAILQ_REMOVE(&stcb->asoc.strmout[i].outqueue, sp, next); 218 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, &asoc->strmout[i], sp, 1); 219 if (sp->net) { 220 sctp_free_remote_addr(sp->net); 221 sp->net = NULL; 222 } 223 if (sp->data) { 224 sctp_m_freem(sp->data); 225 sp->data = NULL; 226 } 227 sctp_free_a_strmoq(stcb, sp, so_locked); 228 if (!TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) { 229 unsent_data++; 230 } 231 } else { 232 unsent_data++; 233 } 234 if (unsent_data > 0) { 235 break; 236 } 237 } 238 } 239 SCTP_TCB_SEND_UNLOCK(stcb); 240 return (unsent_data); 241 } 242 243 static int 244 sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb) 245 { 246 struct sctp_init *init; 247 struct sctp_association *asoc; 248 struct sctp_nets *lnet; 249 unsigned int i; 250 251 init = &cp->init; 252 asoc = &stcb->asoc; 253 /* save off parameters */ 254 asoc->peer_vtag = ntohl(init->initiate_tag); 255 asoc->peers_rwnd = ntohl(init->a_rwnd); 256 /* init tsn's */ 257 asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1; 258 259 if (!TAILQ_EMPTY(&asoc->nets)) { 260 /* update any ssthresh's that may have a default */ 261 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) { 262 lnet->ssthresh = asoc->peers_rwnd; 263 if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) { 264 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION); 265 } 266 } 267 } 268 SCTP_TCB_SEND_LOCK(stcb); 269 if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) { 270 unsigned int newcnt; 271 struct sctp_stream_out *outs; 272 struct sctp_stream_queue_pending *sp, *nsp; 273 struct sctp_tmit_chunk *chk, *nchk; 274 275 /* abandon the upper streams */ 276 newcnt = ntohs(init->num_inbound_streams); 277 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) { 278 if (chk->rec.data.sid >= newcnt) { 279 TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next); 280 asoc->send_queue_cnt--; 281 if (asoc->strmout[chk->rec.data.sid].chunks_on_queues > 0) { 282 asoc->strmout[chk->rec.data.sid].chunks_on_queues--; 283 #ifdef INVARIANTS 284 } else { 285 panic("No chunks on the queues for sid %u.", chk->rec.data.sid); 286 #endif 287 } 288 if (chk->data != NULL) { 289 sctp_free_bufspace(stcb, asoc, chk, 1); 290 sctp_ulp_notify(SCTP_NOTIFY_UNSENT_DG_FAIL, stcb, 291 0, chk, SCTP_SO_NOT_LOCKED); 292 if (chk->data) { 293 sctp_m_freem(chk->data); 294 chk->data = NULL; 295 } 296 } 297 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 298 /* sa_ignore FREED_MEMORY */ 299 } 300 } 301 if (asoc->strmout) { 302 for (i = newcnt; i < asoc->pre_open_streams; i++) { 303 outs = &asoc->strmout[i]; 304 TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) { 305 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1); 306 TAILQ_REMOVE(&outs->outqueue, sp, next); 307 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, outs, sp, 1); 308 sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL, 309 stcb, 0, sp, SCTP_SO_NOT_LOCKED); 310 if (sp->data) { 311 sctp_m_freem(sp->data); 312 sp->data = NULL; 313 } 314 if (sp->net) { 315 sctp_free_remote_addr(sp->net); 316 sp->net = NULL; 317 } 318 /* Free the chunk */ 319 sctp_free_a_strmoq(stcb, sp, SCTP_SO_NOT_LOCKED); 320 /* sa_ignore FREED_MEMORY */ 321 } 322 outs->state = SCTP_STREAM_CLOSED; 323 } 324 } 325 /* cut back the count */ 326 asoc->pre_open_streams = newcnt; 327 } 328 SCTP_TCB_SEND_UNLOCK(stcb); 329 asoc->streamoutcnt = asoc->pre_open_streams; 330 if (asoc->strmout) { 331 for (i = 0; i < asoc->streamoutcnt; i++) { 332 asoc->strmout[i].state = SCTP_STREAM_OPEN; 333 } 334 } 335 /* EY - nr_sack: initialize highest tsn in nr_mapping_array */ 336 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 337 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 338 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 339 } 340 /* This is the next one we expect */ 341 asoc->str_reset_seq_in = asoc->asconf_seq_in + 1; 342 343 asoc->mapping_array_base_tsn = ntohl(init->initial_tsn); 344 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in; 345 346 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 347 /* open the requested streams */ 348 349 if (asoc->strmin != NULL) { 350 /* Free the old ones */ 351 for (i = 0; i < asoc->streamincnt; i++) { 352 sctp_clean_up_stream(stcb, &asoc->strmin[i].inqueue); 353 sctp_clean_up_stream(stcb, &asoc->strmin[i].uno_inqueue); 354 } 355 SCTP_FREE(asoc->strmin, SCTP_M_STRMI); 356 } 357 if (asoc->max_inbound_streams > ntohs(init->num_outbound_streams)) { 358 asoc->streamincnt = ntohs(init->num_outbound_streams); 359 } else { 360 asoc->streamincnt = asoc->max_inbound_streams; 361 } 362 SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt * 363 sizeof(struct sctp_stream_in), SCTP_M_STRMI); 364 if (asoc->strmin == NULL) { 365 /* we didn't get memory for the streams! */ 366 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n"); 367 return (-1); 368 } 369 for (i = 0; i < asoc->streamincnt; i++) { 370 asoc->strmin[i].sid = i; 371 asoc->strmin[i].last_mid_delivered = 0xffffffff; 372 TAILQ_INIT(&asoc->strmin[i].inqueue); 373 TAILQ_INIT(&asoc->strmin[i].uno_inqueue); 374 asoc->strmin[i].pd_api_started = 0; 375 asoc->strmin[i].delivery_started = 0; 376 } 377 /* 378 * load_address_from_init will put the addresses into the 379 * association when the COOKIE is processed or the INIT-ACK is 380 * processed. Both types of COOKIE's existing and new call this 381 * routine. It will remove addresses that are no longer in the 382 * association (for the restarting case where addresses are 383 * removed). Up front when the INIT arrives we will discard it if it 384 * is a restart and new addresses have been added. 385 */ 386 /* sa_ignore MEMLEAK */ 387 return (0); 388 } 389 390 /* 391 * INIT-ACK message processing/consumption returns value < 0 on error 392 */ 393 static int 394 sctp_process_init_ack(struct mbuf *m, int iphlen, int offset, 395 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 396 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 397 struct sctp_nets *net, int *abort_no_unlock, 398 uint8_t mflowtype, uint32_t mflowid, 399 uint32_t vrf_id) 400 { 401 struct sctp_association *asoc; 402 struct mbuf *op_err; 403 int retval, abort_flag, cookie_found; 404 int initack_limit; 405 int nat_friendly = 0; 406 407 /* First verify that we have no illegal param's */ 408 abort_flag = 0; 409 cookie_found = 0; 410 411 op_err = sctp_arethere_unrecognized_parameters(m, 412 (offset + sizeof(struct sctp_init_chunk)), 413 &abort_flag, (struct sctp_chunkhdr *)cp, 414 &nat_friendly, &cookie_found); 415 if (abort_flag) { 416 /* Send an abort and notify peer */ 417 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, false, SCTP_SO_NOT_LOCKED); 418 *abort_no_unlock = 1; 419 return (-1); 420 } 421 if (!cookie_found) { 422 uint16_t len; 423 424 /* Only report the missing cookie parameter */ 425 if (op_err != NULL) { 426 sctp_m_freem(op_err); 427 } 428 len = (uint16_t)(sizeof(struct sctp_error_missing_param) + sizeof(uint16_t)); 429 /* We abort with an error of missing mandatory param */ 430 op_err = sctp_get_mbuf_for_msg(len, 0, M_NOWAIT, 1, MT_DATA); 431 if (op_err != NULL) { 432 struct sctp_error_missing_param *cause; 433 434 SCTP_BUF_LEN(op_err) = len; 435 cause = mtod(op_err, struct sctp_error_missing_param *); 436 /* Subtract the reserved param */ 437 cause->cause.code = htons(SCTP_CAUSE_MISSING_PARAM); 438 cause->cause.length = htons(len); 439 cause->num_missing_params = htonl(1); 440 cause->type[0] = htons(SCTP_STATE_COOKIE); 441 } 442 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 443 src, dst, sh, op_err, 444 mflowtype, mflowid, 445 vrf_id, net->port); 446 *abort_no_unlock = 1; 447 return (-3); 448 } 449 asoc = &stcb->asoc; 450 asoc->peer_supports_nat = (uint8_t)nat_friendly; 451 /* process the peer's parameters in the INIT-ACK */ 452 if (sctp_process_init((struct sctp_init_chunk *)cp, stcb) < 0) { 453 if (op_err != NULL) { 454 sctp_m_freem(op_err); 455 } 456 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 457 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_init() failed\n"); 458 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 459 src, dst, sh, op_err, 460 mflowtype, mflowid, 461 vrf_id, net->port); 462 *abort_no_unlock = 1; 463 return (-1); 464 } 465 initack_limit = offset + ntohs(cp->ch.chunk_length); 466 /* load all addresses */ 467 if ((retval = sctp_load_addresses_from_init(stcb, m, 468 offset + sizeof(struct sctp_init_chunk), 469 initack_limit, src, dst, NULL, stcb->asoc.port)) < 0) { 470 if (op_err != NULL) { 471 sctp_m_freem(op_err); 472 } 473 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 474 "Problem with address parameters"); 475 SCTPDBG(SCTP_DEBUG_INPUT1, 476 "Load addresses from INIT causes an abort %d\n", 477 retval); 478 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 479 src, dst, sh, op_err, 480 mflowtype, mflowid, 481 vrf_id, net->port); 482 *abort_no_unlock = 1; 483 return (-1); 484 } 485 /* if the peer doesn't support asconf, flush the asconf queue */ 486 if (asoc->asconf_supported == 0) { 487 struct sctp_asconf_addr *param, *nparam; 488 489 TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) { 490 TAILQ_REMOVE(&asoc->asconf_queue, param, next); 491 SCTP_FREE(param, SCTP_M_ASC_ADDR); 492 } 493 } 494 495 stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs, 496 stcb->asoc.local_hmacs); 497 if (op_err) { 498 sctp_queue_op_err(stcb, op_err); 499 /* queuing will steal away the mbuf chain to the out queue */ 500 op_err = NULL; 501 } 502 /* extract the cookie and queue it to "echo" it back... */ 503 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 504 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 505 stcb->asoc.overall_error_count, 506 0, 507 SCTP_FROM_SCTP_INPUT, 508 __LINE__); 509 } 510 stcb->asoc.overall_error_count = 0; 511 net->error_count = 0; 512 513 /* 514 * Cancel the INIT timer, We do this first before queueing the 515 * cookie. We always cancel at the primary to assue that we are 516 * canceling the timer started by the INIT which always goes to the 517 * primary. 518 */ 519 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb, 520 asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3); 521 522 /* calculate the RTO */ 523 sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, 524 SCTP_RTT_FROM_NON_DATA); 525 retval = sctp_send_cookie_echo(m, offset, initack_limit, stcb, net); 526 return (retval); 527 } 528 529 static void 530 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp, 531 struct sctp_tcb *stcb, struct sctp_nets *net) 532 { 533 union sctp_sockstore store; 534 struct sctp_nets *r_net, *f_net; 535 struct timeval tv; 536 int req_prim = 0; 537 uint16_t old_error_counter; 538 539 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) { 540 /* Invalid length */ 541 return; 542 } 543 544 memset(&store, 0, sizeof(store)); 545 switch (cp->heartbeat.hb_info.addr_family) { 546 #ifdef INET 547 case AF_INET: 548 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) { 549 store.sin.sin_family = cp->heartbeat.hb_info.addr_family; 550 store.sin.sin_len = cp->heartbeat.hb_info.addr_len; 551 store.sin.sin_port = stcb->rport; 552 memcpy(&store.sin.sin_addr, cp->heartbeat.hb_info.address, 553 sizeof(store.sin.sin_addr)); 554 } else { 555 return; 556 } 557 break; 558 #endif 559 #ifdef INET6 560 case AF_INET6: 561 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) { 562 store.sin6.sin6_family = cp->heartbeat.hb_info.addr_family; 563 store.sin6.sin6_len = cp->heartbeat.hb_info.addr_len; 564 store.sin6.sin6_port = stcb->rport; 565 memcpy(&store.sin6.sin6_addr, cp->heartbeat.hb_info.address, sizeof(struct in6_addr)); 566 } else { 567 return; 568 } 569 break; 570 #endif 571 default: 572 return; 573 } 574 r_net = sctp_findnet(stcb, &store.sa); 575 if (r_net == NULL) { 576 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n"); 577 return; 578 } 579 if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) && 580 (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) && 581 (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) { 582 /* 583 * If the its a HB and it's random value is correct when can 584 * confirm the destination. 585 */ 586 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 587 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) { 588 stcb->asoc.primary_destination = r_net; 589 r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY; 590 f_net = TAILQ_FIRST(&stcb->asoc.nets); 591 if (f_net != r_net) { 592 /* 593 * first one on the list is NOT the primary 594 * sctp_cmpaddr() is much more efficient if 595 * the primary is the first on the list, 596 * make it so. 597 */ 598 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next); 599 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next); 600 } 601 req_prim = 1; 602 } 603 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 604 stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 605 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, 606 r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4); 607 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 608 } 609 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 610 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 611 stcb->asoc.overall_error_count, 612 0, 613 SCTP_FROM_SCTP_INPUT, 614 __LINE__); 615 } 616 stcb->asoc.overall_error_count = 0; 617 old_error_counter = r_net->error_count; 618 r_net->error_count = 0; 619 r_net->hb_responded = 1; 620 tv.tv_sec = cp->heartbeat.hb_info.time_value_1; 621 tv.tv_usec = cp->heartbeat.hb_info.time_value_2; 622 /* Now lets do a RTO with this */ 623 sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, 624 SCTP_RTT_FROM_NON_DATA); 625 if (!(r_net->dest_state & SCTP_ADDR_REACHABLE)) { 626 r_net->dest_state |= SCTP_ADDR_REACHABLE; 627 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb, 628 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 629 } 630 if (r_net->dest_state & SCTP_ADDR_PF) { 631 r_net->dest_state &= ~SCTP_ADDR_PF; 632 stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net); 633 } 634 if (old_error_counter > 0) { 635 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 636 stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_5); 637 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 638 } 639 if (r_net == stcb->asoc.primary_destination) { 640 if (stcb->asoc.alternate) { 641 /* release the alternate, primary is good */ 642 sctp_free_remote_addr(stcb->asoc.alternate); 643 stcb->asoc.alternate = NULL; 644 } 645 } 646 /* Mobility adaptation */ 647 if (req_prim) { 648 if ((sctp_is_mobility_feature_on(stcb->sctp_ep, 649 SCTP_MOBILITY_BASE) || 650 sctp_is_mobility_feature_on(stcb->sctp_ep, 651 SCTP_MOBILITY_FASTHANDOFF)) && 652 sctp_is_mobility_feature_on(stcb->sctp_ep, 653 SCTP_MOBILITY_PRIM_DELETED)) { 654 sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED, 655 stcb->sctp_ep, stcb, NULL, 656 SCTP_FROM_SCTP_INPUT + SCTP_LOC_6); 657 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 658 SCTP_MOBILITY_FASTHANDOFF)) { 659 sctp_assoc_immediate_retrans(stcb, 660 stcb->asoc.primary_destination); 661 } 662 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 663 SCTP_MOBILITY_BASE)) { 664 sctp_move_chunks_from_net(stcb, 665 stcb->asoc.deleted_primary); 666 } 667 sctp_delete_prim_timer(stcb->sctp_ep, stcb); 668 } 669 } 670 } 671 672 static int 673 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb) 674 { 675 /* 676 * Return 0 means we want you to proceed with the abort non-zero 677 * means no abort processing. 678 */ 679 uint32_t new_vtag; 680 struct sctpasochead *head; 681 682 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || 683 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 684 new_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 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 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) { 694 /* generate a new vtag and send init */ 695 LIST_REMOVE(stcb, sctp_asocs); 696 stcb->asoc.my_vtag = new_vtag; 697 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 698 /* 699 * put it in the bucket in the vtag hash of assoc's for the 700 * system 701 */ 702 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 703 SCTP_INP_INFO_WUNLOCK(); 704 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 705 return (1); 706 } else { 707 /* 708 * treat like a case where the cookie expired i.e.: - dump 709 * current cookie. - generate a new vtag. - resend init. 710 */ 711 /* generate a new vtag and send init */ 712 LIST_REMOVE(stcb, sctp_asocs); 713 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT); 714 sctp_stop_all_cookie_timers(stcb); 715 sctp_toss_old_cookies(stcb, &stcb->asoc); 716 stcb->asoc.my_vtag = new_vtag; 717 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 718 /* 719 * put it in the bucket in the vtag hash of assoc's for the 720 * system 721 */ 722 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 723 SCTP_INP_INFO_WUNLOCK(); 724 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 725 return (1); 726 } 727 return (0); 728 } 729 730 static int 731 sctp_handle_nat_missing_state(struct sctp_tcb *stcb, 732 struct sctp_nets *net) 733 { 734 /* 735 * return 0 means we want you to proceed with the abort non-zero 736 * means no abort processing 737 */ 738 if (stcb->asoc.auth_supported == 0) { 739 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n"); 740 return (0); 741 } 742 sctp_asconf_send_nat_state_update(stcb, net); 743 return (1); 744 } 745 746 /* Returns 1 if the stcb was aborted, 0 otherwise */ 747 static int 748 sctp_handle_abort(struct sctp_abort_chunk *abort, 749 struct sctp_tcb *stcb, struct sctp_nets *net) 750 { 751 uint16_t len; 752 uint16_t error; 753 754 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n"); 755 if (stcb == NULL) 756 return (0); 757 758 len = ntohs(abort->ch.chunk_length); 759 if (len >= sizeof(struct sctp_chunkhdr) + sizeof(struct sctp_error_cause)) { 760 /* 761 * Need to check the cause codes for our two magic nat 762 * aborts which don't kill the assoc necessarily. 763 */ 764 struct sctp_error_cause *cause; 765 766 cause = (struct sctp_error_cause *)(abort + 1); 767 error = ntohs(cause->code); 768 if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) { 769 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state, ABORT flags:%x\n", 770 abort->ch.chunk_flags); 771 if (sctp_handle_nat_colliding_state(stcb)) { 772 return (0); 773 } 774 } else if (error == SCTP_CAUSE_NAT_MISSING_STATE) { 775 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state, ABORT flags:%x\n", 776 abort->ch.chunk_flags); 777 if (sctp_handle_nat_missing_state(stcb, net)) { 778 return (0); 779 } 780 } 781 } else { 782 error = 0; 783 } 784 /* stop any receive timers */ 785 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, NULL, 786 SCTP_FROM_SCTP_INPUT + SCTP_LOC_7); 787 /* notify user of the abort and clean up... */ 788 sctp_abort_notification(stcb, true, false, error, abort, SCTP_SO_NOT_LOCKED); 789 /* free the tcb */ 790 SCTP_STAT_INCR_COUNTER32(sctps_aborted); 791 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) || 792 (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 793 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 794 } 795 #ifdef SCTP_ASOCLOG_OF_TSNS 796 sctp_print_out_track_log(stcb); 797 #endif 798 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 799 SCTP_FROM_SCTP_INPUT + SCTP_LOC_8); 800 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n"); 801 return (1); 802 } 803 804 static void 805 sctp_start_net_timers(struct sctp_tcb *stcb) 806 { 807 uint32_t cnt_hb_sent; 808 struct sctp_nets *net; 809 810 cnt_hb_sent = 0; 811 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 812 /* 813 * For each network start: 1) A pmtu timer. 2) A HB timer 3) 814 * If the dest in unconfirmed send a hb as well if under 815 * max_hb_burst have been sent. 816 */ 817 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net); 818 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net); 819 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) && 820 (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) { 821 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 822 cnt_hb_sent++; 823 } 824 } 825 if (cnt_hb_sent) { 826 sctp_chunk_output(stcb->sctp_ep, stcb, 827 SCTP_OUTPUT_FROM_COOKIE_ACK, 828 SCTP_SO_NOT_LOCKED); 829 } 830 } 831 832 static void 833 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp, 834 struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag) 835 { 836 struct sctp_association *asoc; 837 int some_on_streamwheel; 838 int old_state; 839 840 SCTPDBG(SCTP_DEBUG_INPUT2, 841 "sctp_handle_shutdown: handling SHUTDOWN\n"); 842 if (stcb == NULL) 843 return; 844 asoc = &stcb->asoc; 845 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || 846 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 847 return; 848 } 849 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) { 850 /* Shutdown NOT the expected size */ 851 return; 852 } 853 old_state = SCTP_GET_STATE(stcb); 854 sctp_update_acked(stcb, cp, abort_flag); 855 if (*abort_flag) { 856 return; 857 } 858 if (asoc->control_pdapi) { 859 /* 860 * With a normal shutdown we assume the end of last record. 861 */ 862 SCTP_INP_READ_LOCK(stcb->sctp_ep); 863 if (asoc->control_pdapi->on_strm_q) { 864 struct sctp_stream_in *strm; 865 866 strm = &asoc->strmin[asoc->control_pdapi->sinfo_stream]; 867 if (asoc->control_pdapi->on_strm_q == SCTP_ON_UNORDERED) { 868 /* Unordered */ 869 TAILQ_REMOVE(&strm->uno_inqueue, asoc->control_pdapi, next_instrm); 870 asoc->control_pdapi->on_strm_q = 0; 871 } else if (asoc->control_pdapi->on_strm_q == SCTP_ON_ORDERED) { 872 /* Ordered */ 873 TAILQ_REMOVE(&strm->inqueue, asoc->control_pdapi, next_instrm); 874 asoc->control_pdapi->on_strm_q = 0; 875 #ifdef INVARIANTS 876 } else { 877 panic("Unknown state on ctrl:%p on_strm_q:%d", 878 asoc->control_pdapi, 879 asoc->control_pdapi->on_strm_q); 880 #endif 881 } 882 } 883 asoc->control_pdapi->end_added = 1; 884 asoc->control_pdapi->pdapi_aborted = 1; 885 asoc->control_pdapi = NULL; 886 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 887 if (stcb->sctp_socket) { 888 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 889 } 890 } 891 /* goto SHUTDOWN_RECEIVED state to block new requests */ 892 if (stcb->sctp_socket) { 893 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) && 894 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) && 895 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT)) { 896 SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_RECEIVED); 897 /* 898 * notify upper layer that peer has initiated a 899 * shutdown 900 */ 901 sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 902 903 /* reset time */ 904 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 905 } 906 } 907 if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) { 908 /* 909 * stop the shutdown timer, since we WILL move to 910 * SHUTDOWN-ACK-SENT. 911 */ 912 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, 913 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9); 914 } 915 /* Now is there unsent data on a stream somewhere? */ 916 some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED); 917 918 if (!TAILQ_EMPTY(&asoc->send_queue) || 919 !TAILQ_EMPTY(&asoc->sent_queue) || 920 some_on_streamwheel) { 921 /* By returning we will push more data out */ 922 return; 923 } else { 924 /* no outstanding data to send, so move on... */ 925 /* send SHUTDOWN-ACK */ 926 /* move to SHUTDOWN-ACK-SENT state */ 927 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) || 928 (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 929 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 930 } 931 if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 932 SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_ACK_SENT); 933 sctp_stop_timers_for_shutdown(stcb); 934 sctp_send_shutdown_ack(stcb, net); 935 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, 936 stcb->sctp_ep, stcb, net); 937 } else if (old_state == SCTP_STATE_SHUTDOWN_ACK_SENT) { 938 sctp_send_shutdown_ack(stcb, net); 939 } 940 } 941 } 942 943 static void 944 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED, 945 struct sctp_tcb *stcb, 946 struct sctp_nets *net) 947 { 948 struct sctp_association *asoc; 949 950 SCTPDBG(SCTP_DEBUG_INPUT2, 951 "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n"); 952 if (stcb == NULL) 953 return; 954 955 asoc = &stcb->asoc; 956 /* process according to association state */ 957 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || 958 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 959 /* unexpected SHUTDOWN-ACK... do OOTB handling... */ 960 sctp_send_shutdown_complete(stcb, net, 1); 961 SCTP_TCB_UNLOCK(stcb); 962 return; 963 } 964 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) && 965 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) { 966 /* unexpected SHUTDOWN-ACK... so ignore... */ 967 SCTP_TCB_UNLOCK(stcb); 968 return; 969 } 970 if (asoc->control_pdapi) { 971 /* 972 * With a normal shutdown we assume the end of last record. 973 */ 974 SCTP_INP_READ_LOCK(stcb->sctp_ep); 975 asoc->control_pdapi->end_added = 1; 976 asoc->control_pdapi->pdapi_aborted = 1; 977 asoc->control_pdapi = NULL; 978 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 979 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 980 } 981 #ifdef INVARIANTS 982 if (!TAILQ_EMPTY(&asoc->send_queue) || 983 !TAILQ_EMPTY(&asoc->sent_queue) || 984 sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) { 985 panic("Queues are not empty when handling SHUTDOWN-ACK"); 986 } 987 #endif 988 /* stop the timer */ 989 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, 990 SCTP_FROM_SCTP_INPUT + SCTP_LOC_10); 991 /* send SHUTDOWN-COMPLETE */ 992 sctp_send_shutdown_complete(stcb, net, 0); 993 /* notify upper layer protocol */ 994 if (stcb->sctp_socket) { 995 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 996 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 997 stcb->sctp_socket->so_snd.sb_cc = 0; 998 } 999 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 1000 } 1001 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 1002 /* free the TCB but first save off the ep */ 1003 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1004 SCTP_FROM_SCTP_INPUT + SCTP_LOC_11); 1005 } 1006 1007 static void 1008 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, uint8_t chunk_type) 1009 { 1010 switch (chunk_type) { 1011 case SCTP_ASCONF_ACK: 1012 case SCTP_ASCONF: 1013 sctp_asconf_cleanup(stcb); 1014 break; 1015 case SCTP_IFORWARD_CUM_TSN: 1016 case SCTP_FORWARD_CUM_TSN: 1017 stcb->asoc.prsctp_supported = 0; 1018 break; 1019 default: 1020 SCTPDBG(SCTP_DEBUG_INPUT2, 1021 "Peer does not support chunk type %d (0x%x).\n", 1022 chunk_type, chunk_type); 1023 break; 1024 } 1025 } 1026 1027 /* 1028 * Skip past the param header and then we will find the param that caused the 1029 * problem. There are a number of param's in a ASCONF OR the prsctp param 1030 * these will turn of specific features. 1031 * XXX: Is this the right thing to do? 1032 */ 1033 static void 1034 sctp_process_unrecog_param(struct sctp_tcb *stcb, uint16_t parameter_type) 1035 { 1036 switch (parameter_type) { 1037 /* pr-sctp draft */ 1038 case SCTP_PRSCTP_SUPPORTED: 1039 stcb->asoc.prsctp_supported = 0; 1040 break; 1041 case SCTP_SUPPORTED_CHUNK_EXT: 1042 break; 1043 /* draft-ietf-tsvwg-addip-sctp */ 1044 case SCTP_HAS_NAT_SUPPORT: 1045 stcb->asoc.peer_supports_nat = 0; 1046 break; 1047 case SCTP_ADD_IP_ADDRESS: 1048 case SCTP_DEL_IP_ADDRESS: 1049 case SCTP_SET_PRIM_ADDR: 1050 stcb->asoc.asconf_supported = 0; 1051 break; 1052 case SCTP_SUCCESS_REPORT: 1053 case SCTP_ERROR_CAUSE_IND: 1054 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n"); 1055 SCTPDBG(SCTP_DEBUG_INPUT2, 1056 "Turning off ASCONF to this strange peer\n"); 1057 stcb->asoc.asconf_supported = 0; 1058 break; 1059 default: 1060 SCTPDBG(SCTP_DEBUG_INPUT2, 1061 "Peer does not support param type %d (0x%x)??\n", 1062 parameter_type, parameter_type); 1063 break; 1064 } 1065 } 1066 1067 static int 1068 sctp_handle_error(struct sctp_chunkhdr *ch, 1069 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 1070 { 1071 struct sctp_error_cause *cause; 1072 struct sctp_association *asoc; 1073 uint32_t remaining_length, adjust; 1074 uint16_t code, cause_code, cause_length; 1075 1076 /* parse through all of the errors and process */ 1077 asoc = &stcb->asoc; 1078 cause = (struct sctp_error_cause *)((caddr_t)ch + 1079 sizeof(struct sctp_chunkhdr)); 1080 remaining_length = ntohs(ch->chunk_length); 1081 if (remaining_length > limit) { 1082 remaining_length = limit; 1083 } 1084 if (remaining_length >= sizeof(struct sctp_chunkhdr)) { 1085 remaining_length -= sizeof(struct sctp_chunkhdr); 1086 } else { 1087 remaining_length = 0; 1088 } 1089 code = 0; 1090 while (remaining_length >= sizeof(struct sctp_error_cause)) { 1091 /* Process an Error Cause */ 1092 cause_code = ntohs(cause->code); 1093 cause_length = ntohs(cause->length); 1094 if ((cause_length > remaining_length) || (cause_length == 0)) { 1095 /* Invalid cause length, possibly due to truncation. */ 1096 SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in cause - bytes left: %u cause length: %u\n", 1097 remaining_length, cause_length); 1098 return (0); 1099 } 1100 if (code == 0) { 1101 /* report the first error cause */ 1102 code = cause_code; 1103 } 1104 switch (cause_code) { 1105 case SCTP_CAUSE_INVALID_STREAM: 1106 case SCTP_CAUSE_MISSING_PARAM: 1107 case SCTP_CAUSE_INVALID_PARAM: 1108 case SCTP_CAUSE_NO_USER_DATA: 1109 SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %u back? We have a bug :/ (or do they?)\n", 1110 cause_code); 1111 break; 1112 case SCTP_CAUSE_NAT_COLLIDING_STATE: 1113 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state, ERROR flags: %x\n", 1114 ch->chunk_flags); 1115 if (sctp_handle_nat_colliding_state(stcb)) { 1116 return (0); 1117 } 1118 break; 1119 case SCTP_CAUSE_NAT_MISSING_STATE: 1120 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state, ERROR flags: %x\n", 1121 ch->chunk_flags); 1122 if (sctp_handle_nat_missing_state(stcb, net)) { 1123 return (0); 1124 } 1125 break; 1126 case SCTP_CAUSE_STALE_COOKIE: 1127 /* 1128 * We only act if we have echoed a cookie and are 1129 * waiting. 1130 */ 1131 if ((cause_length >= sizeof(struct sctp_error_stale_cookie)) && 1132 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 1133 struct sctp_error_stale_cookie *stale_cookie; 1134 1135 stale_cookie = (struct sctp_error_stale_cookie *)cause; 1136 /* stable_time is in usec, convert to msec. */ 1137 asoc->cookie_preserve_req = ntohl(stale_cookie->stale_time) / 1000; 1138 /* Double it to be more robust on RTX. */ 1139 asoc->cookie_preserve_req *= 2; 1140 asoc->stale_cookie_count++; 1141 if (asoc->stale_cookie_count > 1142 asoc->max_init_times) { 1143 sctp_abort_notification(stcb, false, true, 0, NULL, SCTP_SO_NOT_LOCKED); 1144 /* now free the asoc */ 1145 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1146 SCTP_FROM_SCTP_INPUT + SCTP_LOC_12); 1147 return (-1); 1148 } 1149 /* blast back to INIT state */ 1150 sctp_toss_old_cookies(stcb, &stcb->asoc); 1151 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT); 1152 sctp_stop_all_cookie_timers(stcb); 1153 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 1154 } 1155 break; 1156 case SCTP_CAUSE_UNRESOLVABLE_ADDR: 1157 /* 1158 * Nothing we can do here, we don't do hostname 1159 * addresses so if the peer does not like my IPv6 1160 * (or IPv4 for that matter) it does not matter. If 1161 * they don't support that type of address, they can 1162 * NOT possibly get that packet type... i.e. with no 1163 * IPv6 you can't receive a IPv6 packet. so we can 1164 * safely ignore this one. If we ever added support 1165 * for HOSTNAME Addresses, then we would need to do 1166 * something here. 1167 */ 1168 break; 1169 case SCTP_CAUSE_UNRECOG_CHUNK: 1170 if (cause_length >= sizeof(struct sctp_error_unrecognized_chunk)) { 1171 struct sctp_error_unrecognized_chunk *unrec_chunk; 1172 1173 unrec_chunk = (struct sctp_error_unrecognized_chunk *)cause; 1174 sctp_process_unrecog_chunk(stcb, unrec_chunk->ch.chunk_type); 1175 } 1176 break; 1177 case SCTP_CAUSE_UNRECOG_PARAM: 1178 /* XXX: We only consider the first parameter */ 1179 if (cause_length >= sizeof(struct sctp_error_cause) + sizeof(struct sctp_paramhdr)) { 1180 struct sctp_paramhdr *unrec_parameter; 1181 1182 unrec_parameter = (struct sctp_paramhdr *)(cause + 1); 1183 sctp_process_unrecog_param(stcb, ntohs(unrec_parameter->param_type)); 1184 } 1185 break; 1186 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN: 1187 /* 1188 * We ignore this since the timer will drive out a 1189 * new cookie anyway and there timer will drive us 1190 * to send a SHUTDOWN_COMPLETE. We can't send one 1191 * here since we don't have their tag. 1192 */ 1193 break; 1194 case SCTP_CAUSE_DELETING_LAST_ADDR: 1195 case SCTP_CAUSE_RESOURCE_SHORTAGE: 1196 case SCTP_CAUSE_DELETING_SRC_ADDR: 1197 /* 1198 * We should NOT get these here, but in a 1199 * ASCONF-ACK. 1200 */ 1201 SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a error cause with code %u.\n", 1202 cause_code); 1203 break; 1204 case SCTP_CAUSE_OUT_OF_RESC: 1205 /* 1206 * And what, pray tell do we do with the fact that 1207 * the peer is out of resources? Not really sure we 1208 * could do anything but abort. I suspect this 1209 * should have came WITH an abort instead of in a 1210 * OP-ERROR. 1211 */ 1212 break; 1213 default: 1214 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown code 0x%x\n", 1215 cause_code); 1216 break; 1217 } 1218 adjust = SCTP_SIZE32(cause_length); 1219 if (remaining_length >= adjust) { 1220 remaining_length -= adjust; 1221 } else { 1222 remaining_length = 0; 1223 } 1224 cause = (struct sctp_error_cause *)((caddr_t)cause + adjust); 1225 } 1226 sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, code, ch, SCTP_SO_NOT_LOCKED); 1227 return (0); 1228 } 1229 1230 static int 1231 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset, 1232 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 1233 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 1234 struct sctp_nets *net, int *abort_no_unlock, 1235 uint8_t mflowtype, uint32_t mflowid, 1236 uint32_t vrf_id) 1237 { 1238 struct sctp_init_ack *init_ack; 1239 struct mbuf *op_err; 1240 1241 SCTPDBG(SCTP_DEBUG_INPUT2, 1242 "sctp_handle_init_ack: handling INIT-ACK\n"); 1243 1244 if (stcb == NULL) { 1245 SCTPDBG(SCTP_DEBUG_INPUT2, 1246 "sctp_handle_init_ack: TCB is null\n"); 1247 return (-1); 1248 } 1249 init_ack = &cp->init; 1250 /* Validate parameters. */ 1251 if ((ntohl(init_ack->initiate_tag) == 0) || 1252 (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) || 1253 (ntohs(init_ack->num_inbound_streams) == 0) || 1254 (ntohs(init_ack->num_outbound_streams) == 0)) { 1255 /* protocol error... send an abort */ 1256 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1257 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1258 src, dst, sh, op_err, 1259 mflowtype, mflowid, 1260 vrf_id, net->port); 1261 *abort_no_unlock = 1; 1262 return (-1); 1263 } 1264 /* process according to association state... */ 1265 switch (SCTP_GET_STATE(stcb)) { 1266 case SCTP_STATE_COOKIE_WAIT: 1267 /* this is the expected state for this chunk */ 1268 /* process the INIT-ACK parameters */ 1269 if (stcb->asoc.primary_destination->dest_state & 1270 SCTP_ADDR_UNCONFIRMED) { 1271 /* 1272 * The primary is where we sent the INIT, we can 1273 * always consider it confirmed when the INIT-ACK is 1274 * returned. Do this before we load addresses 1275 * though. 1276 */ 1277 stcb->asoc.primary_destination->dest_state &= 1278 ~SCTP_ADDR_UNCONFIRMED; 1279 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 1280 stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED); 1281 } 1282 if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb, 1283 net, abort_no_unlock, 1284 mflowtype, mflowid, 1285 vrf_id) < 0) { 1286 /* error in parsing parameters */ 1287 return (-1); 1288 } 1289 /* update our state */ 1290 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n"); 1291 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_ECHOED); 1292 1293 /* reset the RTO calc */ 1294 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 1295 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 1296 stcb->asoc.overall_error_count, 1297 0, 1298 SCTP_FROM_SCTP_INPUT, 1299 __LINE__); 1300 } 1301 stcb->asoc.overall_error_count = 0; 1302 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 1303 /* 1304 * collapse the init timer back in case of a exponential 1305 * backoff 1306 */ 1307 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep, 1308 stcb, net); 1309 /* 1310 * the send at the end of the inbound data processing will 1311 * cause the cookie to be sent 1312 */ 1313 break; 1314 case SCTP_STATE_SHUTDOWN_SENT: 1315 /* incorrect state... discard */ 1316 break; 1317 case SCTP_STATE_COOKIE_ECHOED: 1318 /* incorrect state... discard */ 1319 break; 1320 case SCTP_STATE_OPEN: 1321 /* incorrect state... discard */ 1322 break; 1323 case SCTP_STATE_EMPTY: 1324 case SCTP_STATE_INUSE: 1325 default: 1326 /* incorrect state... discard */ 1327 return (-1); 1328 break; 1329 } 1330 SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n"); 1331 return (0); 1332 } 1333 1334 static struct sctp_tcb * 1335 sctp_process_cookie_new(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_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 /* 1345 * handle a state cookie for an existing association m: input packet mbuf 1346 * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a 1347 * "split" mbuf and the cookie signature does not exist offset: offset into 1348 * mbuf to the cookie-echo chunk 1349 */ 1350 static struct sctp_tcb * 1351 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset, 1352 struct sockaddr *src, struct sockaddr *dst, 1353 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1354 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp, 1355 struct sockaddr *init_src, int *notification, 1356 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1357 uint8_t mflowtype, uint32_t mflowid, 1358 uint32_t vrf_id, uint16_t port) 1359 { 1360 struct sctp_association *asoc; 1361 struct sctp_init_chunk *init_cp, init_buf; 1362 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1363 struct sctp_asconf_addr *aparam, *naparam; 1364 struct sctp_asconf_ack *aack, *naack; 1365 struct sctp_tmit_chunk *chk, *nchk; 1366 struct sctp_stream_reset_list *strrst, *nstrrst; 1367 struct sctp_queued_to_read *sq, *nsq; 1368 struct sctp_nets *net; 1369 struct mbuf *op_err; 1370 struct timeval old; 1371 int init_offset, initack_offset, i; 1372 int retval; 1373 int spec_flag = 0; 1374 uint32_t how_indx; 1375 #if defined(SCTP_DETAILED_STR_STATS) 1376 int j; 1377 #endif 1378 1379 net = *netp; 1380 /* I know that the TCB is non-NULL from the caller */ 1381 asoc = &stcb->asoc; 1382 for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) { 1383 if (asoc->cookie_how[how_indx] == 0) 1384 break; 1385 } 1386 if (how_indx < sizeof(asoc->cookie_how)) { 1387 asoc->cookie_how[how_indx] = 1; 1388 } 1389 if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 1390 /* SHUTDOWN came in after sending INIT-ACK */ 1391 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination); 1392 op_err = sctp_generate_cause(SCTP_CAUSE_COOKIE_IN_SHUTDOWN, ""); 1393 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 1394 mflowtype, mflowid, inp->fibnum, 1395 vrf_id, net->port); 1396 if (how_indx < sizeof(asoc->cookie_how)) 1397 asoc->cookie_how[how_indx] = 2; 1398 SCTP_TCB_UNLOCK(stcb); 1399 return (NULL); 1400 } 1401 /* 1402 * find and validate the INIT chunk in the cookie (peer's info) the 1403 * INIT should start after the cookie-echo header struct (chunk 1404 * header, state cookie header struct) 1405 */ 1406 init_offset = offset += sizeof(struct sctp_cookie_echo_chunk); 1407 1408 init_cp = (struct sctp_init_chunk *) 1409 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 1410 (uint8_t *)&init_buf); 1411 if (init_cp == NULL) { 1412 /* could not pull a INIT chunk in cookie */ 1413 SCTP_TCB_UNLOCK(stcb); 1414 return (NULL); 1415 } 1416 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 1417 SCTP_TCB_UNLOCK(stcb); 1418 return (NULL); 1419 } 1420 /* 1421 * find and validate the INIT-ACK chunk in the cookie (my info) the 1422 * INIT-ACK follows the INIT chunk 1423 */ 1424 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 1425 initack_cp = (struct sctp_init_ack_chunk *) 1426 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 1427 (uint8_t *)&initack_buf); 1428 if (initack_cp == NULL) { 1429 /* could not pull INIT-ACK chunk in cookie */ 1430 SCTP_TCB_UNLOCK(stcb); 1431 return (NULL); 1432 } 1433 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 1434 SCTP_TCB_UNLOCK(stcb); 1435 return (NULL); 1436 } 1437 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1438 (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) { 1439 /* 1440 * case D in Section 5.2.4 Table 2: MMAA process accordingly 1441 * to get into the OPEN state 1442 */ 1443 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1444 /*- 1445 * Opps, this means that we somehow generated two vtag's 1446 * the same. I.e. we did: 1447 * Us Peer 1448 * <---INIT(tag=a)------ 1449 * ----INIT-ACK(tag=t)--> 1450 * ----INIT(tag=t)------> *1 1451 * <---INIT-ACK(tag=a)--- 1452 * <----CE(tag=t)------------- *2 1453 * 1454 * At point *1 we should be generating a different 1455 * tag t'. Which means we would throw away the CE and send 1456 * ours instead. Basically this is case C (throw away side). 1457 */ 1458 if (how_indx < sizeof(asoc->cookie_how)) 1459 asoc->cookie_how[how_indx] = 17; 1460 SCTP_TCB_UNLOCK(stcb); 1461 return (NULL); 1462 } 1463 switch (SCTP_GET_STATE(stcb)) { 1464 case SCTP_STATE_COOKIE_WAIT: 1465 case SCTP_STATE_COOKIE_ECHOED: 1466 /* 1467 * INIT was sent but got a COOKIE_ECHO with the 1468 * correct tags... just accept it...but we must 1469 * process the init so that we can make sure we have 1470 * the right seq no's. 1471 */ 1472 /* First we must process the INIT !! */ 1473 if (sctp_process_init(init_cp, stcb) < 0) { 1474 if (how_indx < sizeof(asoc->cookie_how)) 1475 asoc->cookie_how[how_indx] = 3; 1476 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 1477 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_init() failed\n"); 1478 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1479 src, dst, sh, op_err, 1480 mflowtype, mflowid, 1481 vrf_id, net->port); 1482 return (NULL); 1483 } 1484 /* we have already processed the INIT so no problem */ 1485 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, 1486 stcb, net, 1487 SCTP_FROM_SCTP_INPUT + SCTP_LOC_13); 1488 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, 1489 stcb, net, 1490 SCTP_FROM_SCTP_INPUT + SCTP_LOC_14); 1491 /* update current state */ 1492 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) 1493 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1494 else 1495 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1496 1497 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 1498 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1499 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1500 stcb->sctp_ep, stcb, NULL); 1501 } 1502 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1503 sctp_stop_all_cookie_timers(stcb); 1504 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1505 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1506 (!SCTP_IS_LISTENING(inp))) { 1507 /* 1508 * Here is where collision would go if we 1509 * did a connect() and instead got a 1510 * init/init-ack/cookie done before the 1511 * init-ack came back.. 1512 */ 1513 stcb->sctp_ep->sctp_flags |= 1514 SCTP_PCB_FLAGS_CONNECTED; 1515 soisconnected(stcb->sctp_socket); 1516 } 1517 /* notify upper layer */ 1518 *notification = SCTP_NOTIFY_ASSOC_UP; 1519 /* 1520 * since we did not send a HB make sure we don't 1521 * double things 1522 */ 1523 old.tv_sec = cookie->time_entered.tv_sec; 1524 old.tv_usec = cookie->time_entered.tv_usec; 1525 net->hb_responded = 1; 1526 sctp_calculate_rto(stcb, asoc, net, &old, 1527 SCTP_RTT_FROM_NON_DATA); 1528 1529 if (stcb->asoc.sctp_autoclose_ticks && 1530 (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) { 1531 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 1532 inp, stcb, NULL); 1533 } 1534 break; 1535 default: 1536 /* 1537 * we're in the OPEN state (or beyond), so peer must 1538 * have simply lost the COOKIE-ACK 1539 */ 1540 break; 1541 } /* end switch */ 1542 sctp_stop_all_cookie_timers(stcb); 1543 if ((retval = sctp_load_addresses_from_init(stcb, m, 1544 init_offset + sizeof(struct sctp_init_chunk), 1545 initack_offset, src, dst, init_src, stcb->asoc.port)) < 0) { 1546 if (how_indx < sizeof(asoc->cookie_how)) 1547 asoc->cookie_how[how_indx] = 4; 1548 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 1549 "Problem with address parameters"); 1550 SCTPDBG(SCTP_DEBUG_INPUT1, 1551 "Load addresses from INIT causes an abort %d\n", 1552 retval); 1553 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1554 src, dst, sh, op_err, 1555 mflowtype, mflowid, 1556 vrf_id, net->port); 1557 return (NULL); 1558 } 1559 /* respond with a COOKIE-ACK */ 1560 sctp_toss_old_cookies(stcb, asoc); 1561 sctp_send_cookie_ack(stcb); 1562 if (how_indx < sizeof(asoc->cookie_how)) 1563 asoc->cookie_how[how_indx] = 5; 1564 return (stcb); 1565 } 1566 1567 if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1568 ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag && 1569 cookie->tie_tag_my_vtag == 0 && 1570 cookie->tie_tag_peer_vtag == 0) { 1571 /* 1572 * case C in Section 5.2.4 Table 2: XMOO silently discard 1573 */ 1574 if (how_indx < sizeof(asoc->cookie_how)) 1575 asoc->cookie_how[how_indx] = 6; 1576 SCTP_TCB_UNLOCK(stcb); 1577 return (NULL); 1578 } 1579 /* 1580 * If nat support, and the below and stcb is established, send back 1581 * a ABORT(colliding state) if we are established. 1582 */ 1583 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) && 1584 (asoc->peer_supports_nat) && 1585 ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1586 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1587 (asoc->peer_vtag == 0)))) { 1588 /* 1589 * Special case - Peer's support nat. We may have two init's 1590 * that we gave out the same tag on since one was not 1591 * established.. i.e. we get INIT from host-1 behind the nat 1592 * and we respond tag-a, we get a INIT from host-2 behind 1593 * the nat and we get tag-a again. Then we bring up host-1 1594 * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1). 1595 * Now we have colliding state. We must send an abort here 1596 * with colliding state indication. 1597 */ 1598 op_err = sctp_generate_cause(SCTP_CAUSE_NAT_COLLIDING_STATE, ""); 1599 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err, 1600 mflowtype, mflowid, inp->fibnum, 1601 vrf_id, port); 1602 SCTP_TCB_UNLOCK(stcb); 1603 return (NULL); 1604 } 1605 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1606 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1607 (asoc->peer_vtag == 0))) { 1608 /* 1609 * case B in Section 5.2.4 Table 2: MXAA or MOAA my info 1610 * should be ok, re-accept peer info 1611 */ 1612 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1613 /* 1614 * Extension of case C. If we hit this, then the 1615 * random number generator returned the same vtag 1616 * when we first sent our INIT-ACK and when we later 1617 * sent our INIT. The side with the seq numbers that 1618 * are different will be the one that normnally 1619 * would have hit case C. This in effect "extends" 1620 * our vtags in this collision case to be 64 bits. 1621 * The same collision could occur aka you get both 1622 * vtag and seq number the same twice in a row.. but 1623 * is much less likely. If it did happen then we 1624 * would proceed through and bring up the assoc.. we 1625 * may end up with the wrong stream setup however.. 1626 * which would be bad.. but there is no way to 1627 * tell.. until we send on a stream that does not 1628 * exist :-) 1629 */ 1630 if (how_indx < sizeof(asoc->cookie_how)) 1631 asoc->cookie_how[how_indx] = 7; 1632 1633 SCTP_TCB_UNLOCK(stcb); 1634 return (NULL); 1635 } 1636 if (how_indx < sizeof(asoc->cookie_how)) 1637 asoc->cookie_how[how_indx] = 8; 1638 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, 1639 SCTP_FROM_SCTP_INPUT + SCTP_LOC_15); 1640 sctp_stop_all_cookie_timers(stcb); 1641 /* 1642 * since we did not send a HB make sure we don't double 1643 * things 1644 */ 1645 net->hb_responded = 1; 1646 if (stcb->asoc.sctp_autoclose_ticks && 1647 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 1648 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, 1649 NULL); 1650 } 1651 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1652 if (asoc->pre_open_streams < asoc->streamoutcnt) { 1653 asoc->pre_open_streams = asoc->streamoutcnt; 1654 } 1655 1656 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) { 1657 /* 1658 * Ok the peer probably discarded our data (if we 1659 * echoed a cookie+data). So anything on the 1660 * sent_queue should be marked for retransmit, we 1661 * may not get something to kick us so it COULD 1662 * still take a timeout to move these.. but it can't 1663 * hurt to mark them. 1664 */ 1665 1666 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 1667 if (chk->sent < SCTP_DATAGRAM_RESEND) { 1668 chk->sent = SCTP_DATAGRAM_RESEND; 1669 sctp_flight_size_decrease(chk); 1670 sctp_total_flight_decrease(stcb, chk); 1671 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 1672 spec_flag++; 1673 } 1674 } 1675 } 1676 /* process the INIT info (peer's info) */ 1677 if (sctp_process_init(init_cp, stcb) < 0) { 1678 if (how_indx < sizeof(asoc->cookie_how)) 1679 asoc->cookie_how[how_indx] = 9; 1680 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 1681 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_init() failed\n"); 1682 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1683 src, dst, sh, op_err, 1684 mflowtype, mflowid, 1685 vrf_id, net->port); 1686 return (NULL); 1687 } 1688 if ((retval = sctp_load_addresses_from_init(stcb, m, 1689 init_offset + sizeof(struct sctp_init_chunk), 1690 initack_offset, src, dst, init_src, stcb->asoc.port)) < 0) { 1691 if (how_indx < sizeof(asoc->cookie_how)) 1692 asoc->cookie_how[how_indx] = 10; 1693 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 1694 "Problem with address parameters"); 1695 SCTPDBG(SCTP_DEBUG_INPUT1, 1696 "Load addresses from INIT causes an abort %d\n", 1697 retval); 1698 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1699 src, dst, sh, op_err, 1700 mflowtype, mflowid, 1701 vrf_id, net->port); 1702 return (NULL); 1703 } 1704 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || 1705 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 1706 *notification = SCTP_NOTIFY_ASSOC_UP; 1707 1708 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1709 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1710 (!SCTP_IS_LISTENING(inp))) { 1711 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 1712 soisconnected(stcb->sctp_socket); 1713 } 1714 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) 1715 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1716 else 1717 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1718 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1719 } else if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) { 1720 SCTP_STAT_INCR_COUNTER32(sctps_restartestab); 1721 } else { 1722 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1723 } 1724 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 1725 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1726 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1727 stcb->sctp_ep, stcb, NULL); 1728 } 1729 sctp_stop_all_cookie_timers(stcb); 1730 sctp_toss_old_cookies(stcb, asoc); 1731 sctp_send_cookie_ack(stcb); 1732 if (spec_flag) { 1733 /* 1734 * only if we have retrans set do we do this. What 1735 * this call does is get only the COOKIE-ACK out and 1736 * then when we return the normal call to 1737 * sctp_chunk_output will get the retrans out behind 1738 * this. 1739 */ 1740 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED); 1741 } 1742 if (how_indx < sizeof(asoc->cookie_how)) 1743 asoc->cookie_how[how_indx] = 11; 1744 1745 return (stcb); 1746 } 1747 if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1748 ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) && 1749 cookie->tie_tag_my_vtag == asoc->my_vtag_nonce && 1750 cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce && 1751 cookie->tie_tag_peer_vtag != 0) { 1752 struct sctpasochead *head; 1753 1754 if (asoc->peer_supports_nat) { 1755 struct sctp_tcb *local_stcb; 1756 1757 /* 1758 * This is a gross gross hack. Just call the 1759 * cookie_new code since we are allowing a duplicate 1760 * association. I hope this works... 1761 */ 1762 local_stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, 1763 sh, cookie, cookie_len, 1764 inp, netp, init_src, notification, 1765 auth_skipped, auth_offset, auth_len, 1766 mflowtype, mflowid, 1767 vrf_id, port); 1768 if (local_stcb == NULL) { 1769 SCTP_TCB_UNLOCK(stcb); 1770 } 1771 return (local_stcb); 1772 } 1773 /* 1774 * case A in Section 5.2.4 Table 2: XXMM (peer restarted) 1775 */ 1776 /* temp code */ 1777 if (how_indx < sizeof(asoc->cookie_how)) 1778 asoc->cookie_how[how_indx] = 12; 1779 sctp_stop_association_timers(stcb, false); 1780 /* notify upper layer */ 1781 *notification = SCTP_NOTIFY_ASSOC_RESTART; 1782 atomic_add_int(&stcb->asoc.refcnt, 1); 1783 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_OPEN) && 1784 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) && 1785 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT)) { 1786 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1787 } 1788 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) { 1789 SCTP_STAT_INCR_GAUGE32(sctps_restartestab); 1790 } else if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) { 1791 SCTP_STAT_INCR_GAUGE32(sctps_collisionestab); 1792 } 1793 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1794 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 1795 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1796 stcb->sctp_ep, stcb, NULL); 1797 1798 } else if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) { 1799 /* move to OPEN state, if not in SHUTDOWN_SENT */ 1800 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 1801 } 1802 if (asoc->pre_open_streams < asoc->streamoutcnt) { 1803 asoc->pre_open_streams = asoc->streamoutcnt; 1804 } 1805 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 1806 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 1807 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 1808 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 1809 asoc->str_reset_seq_in = asoc->init_seq_number; 1810 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 1811 asoc->send_sack = 1; 1812 asoc->data_pkts_seen = 0; 1813 asoc->last_data_chunk_from = NULL; 1814 asoc->last_control_chunk_from = NULL; 1815 asoc->last_net_cmt_send_started = NULL; 1816 if (asoc->mapping_array) { 1817 memset(asoc->mapping_array, 0, 1818 asoc->mapping_array_size); 1819 } 1820 if (asoc->nr_mapping_array) { 1821 memset(asoc->nr_mapping_array, 0, 1822 asoc->mapping_array_size); 1823 } 1824 SCTP_TCB_UNLOCK(stcb); 1825 SCTP_INP_INFO_WLOCK(); 1826 SCTP_INP_WLOCK(stcb->sctp_ep); 1827 SCTP_TCB_LOCK(stcb); 1828 atomic_add_int(&stcb->asoc.refcnt, -1); 1829 /* send up all the data */ 1830 SCTP_TCB_SEND_LOCK(stcb); 1831 1832 sctp_report_all_outbound(stcb, 0, SCTP_SO_LOCKED); 1833 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 1834 stcb->asoc.strmout[i].chunks_on_queues = 0; 1835 #if defined(SCTP_DETAILED_STR_STATS) 1836 for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) { 1837 asoc->strmout[i].abandoned_sent[j] = 0; 1838 asoc->strmout[i].abandoned_unsent[j] = 0; 1839 } 1840 #else 1841 asoc->strmout[i].abandoned_sent[0] = 0; 1842 asoc->strmout[i].abandoned_unsent[0] = 0; 1843 #endif 1844 stcb->asoc.strmout[i].next_mid_ordered = 0; 1845 stcb->asoc.strmout[i].next_mid_unordered = 0; 1846 stcb->asoc.strmout[i].sid = i; 1847 stcb->asoc.strmout[i].last_msg_incomplete = 0; 1848 } 1849 TAILQ_FOREACH_SAFE(strrst, &asoc->resetHead, next_resp, nstrrst) { 1850 TAILQ_REMOVE(&asoc->resetHead, strrst, next_resp); 1851 SCTP_FREE(strrst, SCTP_M_STRESET); 1852 } 1853 TAILQ_FOREACH_SAFE(sq, &asoc->pending_reply_queue, next, nsq) { 1854 TAILQ_REMOVE(&asoc->pending_reply_queue, sq, next); 1855 if (sq->data) { 1856 sctp_m_freem(sq->data); 1857 sq->data = NULL; 1858 } 1859 sctp_free_remote_addr(sq->whoFrom); 1860 sq->whoFrom = NULL; 1861 sq->stcb = NULL; 1862 sctp_free_a_readq(stcb, sq); 1863 } 1864 TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) { 1865 TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next); 1866 if (chk->data) { 1867 sctp_m_freem(chk->data); 1868 chk->data = NULL; 1869 } 1870 if (chk->holds_key_ref) 1871 sctp_auth_key_release(stcb, chk->auth_keyid, SCTP_SO_LOCKED); 1872 sctp_free_remote_addr(chk->whoTo); 1873 SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_chunk), chk); 1874 SCTP_DECR_CHK_COUNT(); 1875 } 1876 asoc->ctrl_queue_cnt = 0; 1877 asoc->str_reset = NULL; 1878 asoc->stream_reset_outstanding = 0; 1879 TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) { 1880 TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next); 1881 if (chk->data) { 1882 sctp_m_freem(chk->data); 1883 chk->data = NULL; 1884 } 1885 if (chk->holds_key_ref) 1886 sctp_auth_key_release(stcb, chk->auth_keyid, SCTP_SO_LOCKED); 1887 sctp_free_remote_addr(chk->whoTo); 1888 SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_chunk), chk); 1889 SCTP_DECR_CHK_COUNT(); 1890 } 1891 TAILQ_FOREACH_SAFE(aparam, &asoc->asconf_queue, next, naparam) { 1892 TAILQ_REMOVE(&asoc->asconf_queue, aparam, next); 1893 SCTP_FREE(aparam, SCTP_M_ASC_ADDR); 1894 } 1895 TAILQ_FOREACH_SAFE(aack, &asoc->asconf_ack_sent, next, naack) { 1896 TAILQ_REMOVE(&asoc->asconf_ack_sent, aack, next); 1897 if (aack->data != NULL) { 1898 sctp_m_freem(aack->data); 1899 } 1900 SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_asconf_ack), aack); 1901 } 1902 1903 /* process the INIT-ACK info (my info) */ 1904 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 1905 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1906 1907 /* pull from vtag hash */ 1908 LIST_REMOVE(stcb, sctp_asocs); 1909 /* re-insert to new vtag position */ 1910 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, 1911 SCTP_BASE_INFO(hashasocmark))]; 1912 /* 1913 * put it in the bucket in the vtag hash of assoc's for the 1914 * system 1915 */ 1916 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 1917 1918 SCTP_TCB_SEND_UNLOCK(stcb); 1919 SCTP_INP_WUNLOCK(stcb->sctp_ep); 1920 SCTP_INP_INFO_WUNLOCK(); 1921 asoc->total_flight = 0; 1922 asoc->total_flight_count = 0; 1923 /* process the INIT info (peer's info) */ 1924 if (sctp_process_init(init_cp, stcb) < 0) { 1925 if (how_indx < sizeof(asoc->cookie_how)) 1926 asoc->cookie_how[how_indx] = 13; 1927 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 1928 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_init() failed\n"); 1929 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1930 src, dst, sh, op_err, 1931 mflowtype, mflowid, 1932 vrf_id, net->port); 1933 return (NULL); 1934 } 1935 /* 1936 * since we did not send a HB make sure we don't double 1937 * things 1938 */ 1939 net->hb_responded = 1; 1940 1941 if ((retval = sctp_load_addresses_from_init(stcb, m, 1942 init_offset + sizeof(struct sctp_init_chunk), 1943 initack_offset, src, dst, init_src, stcb->asoc.port)) < 0) { 1944 if (how_indx < sizeof(asoc->cookie_how)) 1945 asoc->cookie_how[how_indx] = 14; 1946 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 1947 "Problem with address parameters"); 1948 SCTPDBG(SCTP_DEBUG_INPUT1, 1949 "Load addresses from INIT causes an abort %d\n", 1950 retval); 1951 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1952 src, dst, sh, op_err, 1953 mflowtype, mflowid, 1954 vrf_id, net->port); 1955 return (NULL); 1956 } 1957 /* respond with a COOKIE-ACK */ 1958 sctp_send_cookie_ack(stcb); 1959 if (how_indx < sizeof(asoc->cookie_how)) 1960 asoc->cookie_how[how_indx] = 15; 1961 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE) && 1962 (asoc->sctp_autoclose_ticks > 0)) { 1963 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL); 1964 } 1965 return (stcb); 1966 } 1967 if (how_indx < sizeof(asoc->cookie_how)) 1968 asoc->cookie_how[how_indx] = 16; 1969 /* all other cases... */ 1970 SCTP_TCB_UNLOCK(stcb); 1971 return (NULL); 1972 } 1973 1974 /* 1975 * handle a state cookie for a new association m: input packet mbuf chain-- 1976 * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf 1977 * and the cookie signature does not exist offset: offset into mbuf to the 1978 * cookie-echo chunk length: length of the cookie chunk to: where the init 1979 * was from returns a new TCB 1980 */ 1981 static struct sctp_tcb * 1982 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1983 struct sockaddr *src, struct sockaddr *dst, 1984 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1985 struct sctp_inpcb *inp, struct sctp_nets **netp, 1986 struct sockaddr *init_src, int *notification, 1987 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1988 uint8_t mflowtype, uint32_t mflowid, 1989 uint32_t vrf_id, uint16_t port) 1990 { 1991 struct sctp_tcb *stcb; 1992 struct sctp_init_chunk *init_cp, init_buf; 1993 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1994 union sctp_sockstore store; 1995 struct sctp_association *asoc; 1996 int init_offset, initack_offset, initack_limit; 1997 int retval; 1998 int error = 0; 1999 uint8_t auth_chunk_buf[SCTP_CHUNK_BUFFER_SIZE]; 2000 2001 /* 2002 * find and validate the INIT chunk in the cookie (peer's info) the 2003 * INIT should start after the cookie-echo header struct (chunk 2004 * header, state cookie header struct) 2005 */ 2006 init_offset = offset + sizeof(struct sctp_cookie_echo_chunk); 2007 init_cp = (struct sctp_init_chunk *) 2008 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 2009 (uint8_t *)&init_buf); 2010 if (init_cp == NULL) { 2011 /* could not pull a INIT chunk in cookie */ 2012 SCTPDBG(SCTP_DEBUG_INPUT1, 2013 "process_cookie_new: could not pull INIT chunk hdr\n"); 2014 return (NULL); 2015 } 2016 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 2017 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n"); 2018 return (NULL); 2019 } 2020 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 2021 /* 2022 * find and validate the INIT-ACK chunk in the cookie (my info) the 2023 * INIT-ACK follows the INIT chunk 2024 */ 2025 initack_cp = (struct sctp_init_ack_chunk *) 2026 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 2027 (uint8_t *)&initack_buf); 2028 if (initack_cp == NULL) { 2029 /* could not pull INIT-ACK chunk in cookie */ 2030 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n"); 2031 return (NULL); 2032 } 2033 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 2034 return (NULL); 2035 } 2036 /* 2037 * NOTE: We can't use the INIT_ACK's chk_length to determine the 2038 * "initack_limit" value. This is because the chk_length field 2039 * includes the length of the cookie, but the cookie is omitted when 2040 * the INIT and INIT_ACK are tacked onto the cookie... 2041 */ 2042 initack_limit = offset + cookie_len; 2043 2044 /* 2045 * now that we know the INIT/INIT-ACK are in place, create a new TCB 2046 * and popluate 2047 */ 2048 2049 /* 2050 * Here we do a trick, we set in NULL for the proc/thread argument. 2051 * We do this since in effect we only use the p argument when the 2052 * socket is unbound and we must do an implicit bind. Since we are 2053 * getting a cookie, we cannot be unbound. 2054 */ 2055 stcb = sctp_aloc_assoc(inp, init_src, &error, 2056 ntohl(initack_cp->init.initiate_tag), 2057 ntohl(initack_cp->init.initial_tsn), vrf_id, 2058 ntohs(initack_cp->init.num_outbound_streams), 2059 port, 2060 (struct thread *)NULL, 2061 SCTP_DONT_INITIALIZE_AUTH_PARAMS); 2062 if (stcb == NULL) { 2063 struct mbuf *op_err; 2064 2065 /* memory problem? */ 2066 SCTPDBG(SCTP_DEBUG_INPUT1, 2067 "process_cookie_new: no room for another TCB!\n"); 2068 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2069 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2070 src, dst, sh, op_err, 2071 mflowtype, mflowid, 2072 vrf_id, port); 2073 return (NULL); 2074 } 2075 asoc = &stcb->asoc; 2076 /* get scope variables out of cookie */ 2077 asoc->scope.ipv4_local_scope = cookie->ipv4_scope; 2078 asoc->scope.site_scope = cookie->site_scope; 2079 asoc->scope.local_scope = cookie->local_scope; 2080 asoc->scope.loopback_scope = cookie->loopback_scope; 2081 2082 if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) || 2083 (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) { 2084 struct mbuf *op_err; 2085 2086 /* 2087 * Houston we have a problem. The EP changed while the 2088 * cookie was in flight. Only recourse is to abort the 2089 * association. 2090 */ 2091 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2092 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2093 src, dst, sh, op_err, 2094 mflowtype, mflowid, 2095 vrf_id, port); 2096 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2097 SCTP_FROM_SCTP_INPUT + SCTP_LOC_18); 2098 return (NULL); 2099 } 2100 /* process the INIT-ACK info (my info) */ 2101 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 2102 2103 /* process the INIT info (peer's info) */ 2104 if (sctp_process_init(init_cp, stcb) < 0) { 2105 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2106 SCTP_FROM_SCTP_INPUT + SCTP_LOC_19); 2107 return (NULL); 2108 } 2109 /* load all addresses */ 2110 if ((retval = sctp_load_addresses_from_init(stcb, m, 2111 init_offset + sizeof(struct sctp_init_chunk), 2112 initack_offset, src, dst, init_src, port)) < 0) { 2113 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2114 SCTP_FROM_SCTP_INPUT + SCTP_LOC_20); 2115 return (NULL); 2116 } 2117 /* 2118 * verify any preceding AUTH chunk that was skipped 2119 */ 2120 /* pull the local authentication parameters from the cookie/init-ack */ 2121 sctp_auth_get_cookie_params(stcb, m, 2122 initack_offset + sizeof(struct sctp_init_ack_chunk), 2123 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk))); 2124 if (auth_skipped) { 2125 struct sctp_auth_chunk *auth; 2126 2127 if (auth_len <= SCTP_CHUNK_BUFFER_SIZE) { 2128 auth = (struct sctp_auth_chunk *)sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf); 2129 } else { 2130 auth = NULL; 2131 } 2132 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) { 2133 /* auth HMAC failed, dump the assoc and packet */ 2134 SCTPDBG(SCTP_DEBUG_AUTH1, 2135 "COOKIE-ECHO: AUTH failed\n"); 2136 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2137 SCTP_FROM_SCTP_INPUT + SCTP_LOC_21); 2138 return (NULL); 2139 } else { 2140 /* remaining chunks checked... good to go */ 2141 stcb->asoc.authenticated = 1; 2142 } 2143 } 2144 2145 /* 2146 * if we're doing ASCONFs, check to see if we have any new local 2147 * addresses that need to get added to the peer (eg. addresses 2148 * changed while cookie echo in flight). This needs to be done 2149 * after we go to the OPEN state to do the correct asconf 2150 * processing. else, make sure we have the correct addresses in our 2151 * lists 2152 */ 2153 2154 /* warning, we re-use sin, sin6, sa_store here! */ 2155 /* pull in local_address (our "from" address) */ 2156 switch (cookie->laddr_type) { 2157 #ifdef INET 2158 case SCTP_IPV4_ADDRESS: 2159 /* source addr is IPv4 */ 2160 memset(&store.sin, 0, sizeof(struct sockaddr_in)); 2161 store.sin.sin_family = AF_INET; 2162 store.sin.sin_len = sizeof(struct sockaddr_in); 2163 store.sin.sin_addr.s_addr = cookie->laddress[0]; 2164 break; 2165 #endif 2166 #ifdef INET6 2167 case SCTP_IPV6_ADDRESS: 2168 /* source addr is IPv6 */ 2169 memset(&store.sin6, 0, sizeof(struct sockaddr_in6)); 2170 store.sin6.sin6_family = AF_INET6; 2171 store.sin6.sin6_len = sizeof(struct sockaddr_in6); 2172 store.sin6.sin6_scope_id = cookie->scope_id; 2173 memcpy(&store.sin6.sin6_addr, cookie->laddress, sizeof(struct in6_addr)); 2174 break; 2175 #endif 2176 default: 2177 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2178 SCTP_FROM_SCTP_INPUT + SCTP_LOC_22); 2179 return (NULL); 2180 } 2181 2182 /* update current state */ 2183 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2184 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 2185 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2186 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2187 stcb->sctp_ep, stcb, NULL); 2188 } 2189 sctp_stop_all_cookie_timers(stcb); 2190 SCTP_STAT_INCR_COUNTER32(sctps_passiveestab); 2191 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2192 2193 /* set up to notify upper layer */ 2194 *notification = SCTP_NOTIFY_ASSOC_UP; 2195 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2196 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 2197 (!SCTP_IS_LISTENING(inp))) { 2198 /* 2199 * This is an endpoint that called connect() how it got a 2200 * cookie that is NEW is a bit of a mystery. It must be that 2201 * the INIT was sent, but before it got there.. a complete 2202 * INIT/INIT-ACK/COOKIE arrived. But of course then it 2203 * should have went to the other code.. not here.. oh well.. 2204 * a bit of protection is worth having.. 2205 */ 2206 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2207 soisconnected(stcb->sctp_socket); 2208 } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 2209 (SCTP_IS_LISTENING(inp))) { 2210 /* 2211 * We don't want to do anything with this one. Since it is 2212 * the listening guy. The timer will get started for 2213 * accepted connections in the caller. 2214 */ 2215 ; 2216 } 2217 if (stcb->asoc.sctp_autoclose_ticks && 2218 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2219 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL); 2220 } 2221 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 2222 *netp = sctp_findnet(stcb, init_src); 2223 if (*netp != NULL) { 2224 struct timeval old; 2225 2226 /* 2227 * Since we did not send a HB, make sure we don't double 2228 * things. 2229 */ 2230 (*netp)->hb_responded = 1; 2231 /* Calculate the RTT. */ 2232 old.tv_sec = cookie->time_entered.tv_sec; 2233 old.tv_usec = cookie->time_entered.tv_usec; 2234 sctp_calculate_rto(stcb, asoc, *netp, &old, SCTP_RTT_FROM_NON_DATA); 2235 } 2236 /* respond with a COOKIE-ACK */ 2237 sctp_send_cookie_ack(stcb); 2238 2239 /* 2240 * check the address lists for any ASCONFs that need to be sent 2241 * AFTER the cookie-ack is sent 2242 */ 2243 sctp_check_address_list(stcb, m, 2244 initack_offset + sizeof(struct sctp_init_ack_chunk), 2245 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)), 2246 &store.sa, cookie->local_scope, cookie->site_scope, 2247 cookie->ipv4_scope, cookie->loopback_scope); 2248 2249 return (stcb); 2250 } 2251 2252 /* 2253 * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e 2254 * we NEED to make sure we are not already using the vtag. If so we 2255 * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit! 2256 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag, 2257 SCTP_BASE_INFO(hashasocmark))]; 2258 LIST_FOREACH(stcb, head, sctp_asocs) { 2259 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep)) { 2260 -- SEND ABORT - TRY AGAIN -- 2261 } 2262 } 2263 */ 2264 2265 /* 2266 * handles a COOKIE-ECHO message stcb: modified to either a new or left as 2267 * existing (non-NULL) TCB 2268 */ 2269 static struct mbuf * 2270 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset, 2271 struct sockaddr *src, struct sockaddr *dst, 2272 struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp, 2273 struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp, 2274 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2275 struct sctp_tcb **locked_tcb, 2276 uint8_t mflowtype, uint32_t mflowid, 2277 uint32_t vrf_id, uint16_t port) 2278 { 2279 struct sctp_state_cookie *cookie; 2280 struct sctp_tcb *l_stcb = *stcb; 2281 struct sctp_inpcb *l_inp; 2282 struct sockaddr *to; 2283 struct sctp_pcb *ep; 2284 struct mbuf *m_sig; 2285 uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE]; 2286 uint8_t *sig; 2287 uint8_t cookie_ok = 0; 2288 unsigned int sig_offset, cookie_offset; 2289 unsigned int cookie_len; 2290 struct timeval now; 2291 struct timeval time_entered, time_expires; 2292 int notification = 0; 2293 struct sctp_nets *netl; 2294 int had_a_existing_tcb = 0; 2295 int send_int_conf = 0; 2296 #ifdef INET 2297 struct sockaddr_in sin; 2298 #endif 2299 #ifdef INET6 2300 struct sockaddr_in6 sin6; 2301 #endif 2302 2303 SCTPDBG(SCTP_DEBUG_INPUT2, 2304 "sctp_handle_cookie: handling COOKIE-ECHO\n"); 2305 2306 if (inp_p == NULL) { 2307 return (NULL); 2308 } 2309 cookie = &cp->cookie; 2310 cookie_offset = offset + sizeof(struct sctp_chunkhdr); 2311 cookie_len = ntohs(cp->ch.chunk_length); 2312 2313 if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) + 2314 sizeof(struct sctp_init_chunk) + 2315 sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) { 2316 /* cookie too small */ 2317 return (NULL); 2318 } 2319 if ((cookie->peerport != sh->src_port) || 2320 (cookie->myport != sh->dest_port) || 2321 (cookie->my_vtag != sh->v_tag)) { 2322 /* 2323 * invalid ports or bad tag. Note that we always leave the 2324 * v_tag in the header in network order and when we stored 2325 * it in the my_vtag slot we also left it in network order. 2326 * This maintains the match even though it may be in the 2327 * opposite byte order of the machine :-> 2328 */ 2329 return (NULL); 2330 } 2331 /* 2332 * split off the signature into its own mbuf (since it should not be 2333 * calculated in the sctp_hmac_m() call). 2334 */ 2335 sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE; 2336 m_sig = m_split(m, sig_offset, M_NOWAIT); 2337 if (m_sig == NULL) { 2338 /* out of memory or ?? */ 2339 return (NULL); 2340 } 2341 #ifdef SCTP_MBUF_LOGGING 2342 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 2343 sctp_log_mbc(m_sig, SCTP_MBUF_SPLIT); 2344 } 2345 #endif 2346 2347 /* 2348 * compute the signature/digest for the cookie 2349 */ 2350 ep = &(*inp_p)->sctp_ep; 2351 l_inp = *inp_p; 2352 if (l_stcb) { 2353 SCTP_TCB_UNLOCK(l_stcb); 2354 } 2355 SCTP_INP_RLOCK(l_inp); 2356 if (l_stcb) { 2357 SCTP_TCB_LOCK(l_stcb); 2358 } 2359 /* which cookie is it? */ 2360 if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) && 2361 (ep->current_secret_number != ep->last_secret_number)) { 2362 /* it's the old cookie */ 2363 (void)sctp_hmac_m(SCTP_HMAC, 2364 (uint8_t *)ep->secret_key[(int)ep->last_secret_number], 2365 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2366 } else { 2367 /* it's the current cookie */ 2368 (void)sctp_hmac_m(SCTP_HMAC, 2369 (uint8_t *)ep->secret_key[(int)ep->current_secret_number], 2370 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2371 } 2372 /* get the signature */ 2373 SCTP_INP_RUNLOCK(l_inp); 2374 sig = (uint8_t *)sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *)&tmp_sig); 2375 if (sig == NULL) { 2376 /* couldn't find signature */ 2377 sctp_m_freem(m_sig); 2378 return (NULL); 2379 } 2380 /* compare the received digest with the computed digest */ 2381 if (timingsafe_bcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) { 2382 /* try the old cookie? */ 2383 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) && 2384 (ep->current_secret_number != ep->last_secret_number)) { 2385 /* compute digest with old */ 2386 (void)sctp_hmac_m(SCTP_HMAC, 2387 (uint8_t *)ep->secret_key[(int)ep->last_secret_number], 2388 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2389 /* compare */ 2390 if (timingsafe_bcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0) 2391 cookie_ok = 1; 2392 } 2393 } else { 2394 cookie_ok = 1; 2395 } 2396 2397 /* 2398 * Now before we continue we must reconstruct our mbuf so that 2399 * normal processing of any other chunks will work. 2400 */ 2401 { 2402 struct mbuf *m_at; 2403 2404 m_at = m; 2405 while (SCTP_BUF_NEXT(m_at) != NULL) { 2406 m_at = SCTP_BUF_NEXT(m_at); 2407 } 2408 SCTP_BUF_NEXT(m_at) = m_sig; 2409 } 2410 2411 if (cookie_ok == 0) { 2412 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n"); 2413 SCTPDBG(SCTP_DEBUG_INPUT2, 2414 "offset = %u, cookie_offset = %u, sig_offset = %u\n", 2415 (uint32_t)offset, cookie_offset, sig_offset); 2416 return (NULL); 2417 } 2418 2419 if (sctp_ticks_to_msecs(cookie->cookie_life) > SCTP_MAX_COOKIE_LIFE) { 2420 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: Invalid cookie lifetime\n"); 2421 return (NULL); 2422 } 2423 time_entered.tv_sec = cookie->time_entered.tv_sec; 2424 time_entered.tv_usec = cookie->time_entered.tv_usec; 2425 if ((time_entered.tv_sec < 0) || 2426 (time_entered.tv_usec < 0) || 2427 (time_entered.tv_usec >= 1000000)) { 2428 /* Invalid time stamp. Cookie must have been modified. */ 2429 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: Invalid time stamp\n"); 2430 return (NULL); 2431 } 2432 (void)SCTP_GETTIME_TIMEVAL(&now); 2433 if (timevalcmp(&now, &time_entered, <)) { 2434 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie generated in the future!\n"); 2435 return (NULL); 2436 } 2437 /* 2438 * Check the cookie timestamps to be sure it's not stale. 2439 * cookie_life is in ticks, so we convert to seconds. 2440 */ 2441 time_expires.tv_sec = time_entered.tv_sec + sctp_ticks_to_secs(cookie->cookie_life); 2442 time_expires.tv_usec = time_entered.tv_usec; 2443 if (timevalcmp(&now, &time_expires, >)) { 2444 /* cookie is stale! */ 2445 struct mbuf *op_err; 2446 struct sctp_error_stale_cookie *cause; 2447 struct timeval diff; 2448 uint32_t staleness; 2449 2450 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_error_stale_cookie), 2451 0, M_NOWAIT, 1, MT_DATA); 2452 if (op_err == NULL) { 2453 /* FOOBAR */ 2454 return (NULL); 2455 } 2456 /* Set the len */ 2457 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_error_stale_cookie); 2458 cause = mtod(op_err, struct sctp_error_stale_cookie *); 2459 cause->cause.code = htons(SCTP_CAUSE_STALE_COOKIE); 2460 cause->cause.length = htons(sizeof(struct sctp_error_stale_cookie)); 2461 diff = now; 2462 timevalsub(&diff, &time_expires); 2463 if ((uint32_t)diff.tv_sec > UINT32_MAX / 1000000) { 2464 staleness = UINT32_MAX; 2465 } else { 2466 staleness = diff.tv_sec * 1000000; 2467 } 2468 if (UINT32_MAX - staleness >= (uint32_t)diff.tv_usec) { 2469 staleness += diff.tv_usec; 2470 } else { 2471 staleness = UINT32_MAX; 2472 } 2473 cause->stale_time = htonl(staleness); 2474 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 2475 mflowtype, mflowid, l_inp->fibnum, 2476 vrf_id, port); 2477 return (NULL); 2478 } 2479 /* 2480 * Now we must see with the lookup address if we have an existing 2481 * asoc. This will only happen if we were in the COOKIE-WAIT state 2482 * and a INIT collided with us and somewhere the peer sent the 2483 * cookie on another address besides the single address our assoc 2484 * had for him. In this case we will have one of the tie-tags set at 2485 * least AND the address field in the cookie can be used to look it 2486 * up. 2487 */ 2488 to = NULL; 2489 switch (cookie->addr_type) { 2490 #ifdef INET6 2491 case SCTP_IPV6_ADDRESS: 2492 memset(&sin6, 0, sizeof(sin6)); 2493 sin6.sin6_family = AF_INET6; 2494 sin6.sin6_len = sizeof(sin6); 2495 sin6.sin6_port = sh->src_port; 2496 sin6.sin6_scope_id = cookie->scope_id; 2497 memcpy(&sin6.sin6_addr.s6_addr, cookie->address, 2498 sizeof(sin6.sin6_addr.s6_addr)); 2499 to = (struct sockaddr *)&sin6; 2500 break; 2501 #endif 2502 #ifdef INET 2503 case SCTP_IPV4_ADDRESS: 2504 memset(&sin, 0, sizeof(sin)); 2505 sin.sin_family = AF_INET; 2506 sin.sin_len = sizeof(sin); 2507 sin.sin_port = sh->src_port; 2508 sin.sin_addr.s_addr = cookie->address[0]; 2509 to = (struct sockaddr *)&sin; 2510 break; 2511 #endif 2512 default: 2513 /* This should not happen */ 2514 return (NULL); 2515 } 2516 if (*stcb == NULL) { 2517 /* Yep, lets check */ 2518 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL); 2519 if (*stcb == NULL) { 2520 /* 2521 * We should have only got back the same inp. If we 2522 * got back a different ep we have a problem. The 2523 * original findep got back l_inp and now 2524 */ 2525 if (l_inp != *inp_p) { 2526 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n"); 2527 } 2528 } else { 2529 if (*locked_tcb == NULL) { 2530 /* 2531 * In this case we found the assoc only 2532 * after we locked the create lock. This 2533 * means we are in a colliding case and we 2534 * must make sure that we unlock the tcb if 2535 * its one of the cases where we throw away 2536 * the incoming packets. 2537 */ 2538 *locked_tcb = *stcb; 2539 2540 /* 2541 * We must also increment the inp ref count 2542 * since the ref_count flags was set when we 2543 * did not find the TCB, now we found it 2544 * which reduces the refcount.. we must 2545 * raise it back out to balance it all :-) 2546 */ 2547 SCTP_INP_INCR_REF((*stcb)->sctp_ep); 2548 if ((*stcb)->sctp_ep != l_inp) { 2549 SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n", 2550 (void *)(*stcb)->sctp_ep, (void *)l_inp); 2551 } 2552 } 2553 } 2554 } 2555 2556 cookie_len -= SCTP_SIGNATURE_SIZE; 2557 if (*stcb == NULL) { 2558 /* this is the "normal" case... get a new TCB */ 2559 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh, 2560 cookie, cookie_len, *inp_p, 2561 netp, to, ¬ification, 2562 auth_skipped, auth_offset, auth_len, 2563 mflowtype, mflowid, 2564 vrf_id, port); 2565 } else { 2566 /* this is abnormal... cookie-echo on existing TCB */ 2567 had_a_existing_tcb = 1; 2568 *stcb = sctp_process_cookie_existing(m, iphlen, offset, 2569 src, dst, sh, 2570 cookie, cookie_len, *inp_p, *stcb, netp, to, 2571 ¬ification, auth_skipped, auth_offset, auth_len, 2572 mflowtype, mflowid, 2573 vrf_id, port); 2574 if (*stcb == NULL) { 2575 *locked_tcb = NULL; 2576 } 2577 } 2578 2579 if (*stcb == NULL) { 2580 /* still no TCB... must be bad cookie-echo */ 2581 return (NULL); 2582 } 2583 if (*netp != NULL) { 2584 (*netp)->flowtype = mflowtype; 2585 (*netp)->flowid = mflowid; 2586 } 2587 /* 2588 * Ok, we built an association so confirm the address we sent the 2589 * INIT-ACK to. 2590 */ 2591 netl = sctp_findnet(*stcb, to); 2592 /* 2593 * This code should in theory NOT run but 2594 */ 2595 if (netl == NULL) { 2596 /* TSNH! Huh, why do I need to add this address here? */ 2597 if (sctp_add_remote_addr(*stcb, to, NULL, port, 2598 SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) { 2599 return (NULL); 2600 } 2601 netl = sctp_findnet(*stcb, to); 2602 } 2603 if (netl) { 2604 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) { 2605 netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 2606 (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL, 2607 netl); 2608 send_int_conf = 1; 2609 } 2610 } 2611 sctp_start_net_timers(*stcb); 2612 if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) { 2613 if (!had_a_existing_tcb || 2614 (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) { 2615 /* 2616 * If we have a NEW cookie or the connect never 2617 * reached the connected state during collision we 2618 * must do the TCP accept thing. 2619 */ 2620 struct socket *so, *oso; 2621 struct sctp_inpcb *inp; 2622 2623 if (notification == SCTP_NOTIFY_ASSOC_RESTART) { 2624 /* 2625 * For a restart we will keep the same 2626 * socket, no need to do anything. I THINK!! 2627 */ 2628 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2629 if (send_int_conf) { 2630 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2631 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2632 } 2633 return (m); 2634 } 2635 oso = (*inp_p)->sctp_socket; 2636 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2637 SCTP_TCB_UNLOCK((*stcb)); 2638 CURVNET_SET(oso->so_vnet); 2639 so = sonewconn(oso, 0 2640 ); 2641 CURVNET_RESTORE(); 2642 SCTP_TCB_LOCK((*stcb)); 2643 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2644 2645 if (so == NULL) { 2646 struct mbuf *op_err; 2647 2648 /* Too many sockets */ 2649 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n"); 2650 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2651 sctp_abort_association(*inp_p, NULL, m, iphlen, 2652 src, dst, sh, op_err, 2653 mflowtype, mflowid, 2654 vrf_id, port); 2655 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, 2656 SCTP_FROM_SCTP_INPUT + SCTP_LOC_23); 2657 return (NULL); 2658 } 2659 inp = (struct sctp_inpcb *)so->so_pcb; 2660 SCTP_INP_INCR_REF(inp); 2661 /* 2662 * We add the unbound flag here so that if we get an 2663 * soabort() before we get the move_pcb done, we 2664 * will properly cleanup. 2665 */ 2666 inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE | 2667 SCTP_PCB_FLAGS_CONNECTED | 2668 SCTP_PCB_FLAGS_IN_TCPPOOL | 2669 SCTP_PCB_FLAGS_UNBOUND | 2670 (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) | 2671 SCTP_PCB_FLAGS_DONT_WAKE); 2672 inp->sctp_features = (*inp_p)->sctp_features; 2673 inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features; 2674 inp->sctp_socket = so; 2675 inp->sctp_frag_point = (*inp_p)->sctp_frag_point; 2676 inp->max_cwnd = (*inp_p)->max_cwnd; 2677 inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off; 2678 inp->ecn_supported = (*inp_p)->ecn_supported; 2679 inp->prsctp_supported = (*inp_p)->prsctp_supported; 2680 inp->auth_supported = (*inp_p)->auth_supported; 2681 inp->asconf_supported = (*inp_p)->asconf_supported; 2682 inp->reconfig_supported = (*inp_p)->reconfig_supported; 2683 inp->nrsack_supported = (*inp_p)->nrsack_supported; 2684 inp->pktdrop_supported = (*inp_p)->pktdrop_supported; 2685 inp->partial_delivery_point = (*inp_p)->partial_delivery_point; 2686 inp->sctp_context = (*inp_p)->sctp_context; 2687 inp->local_strreset_support = (*inp_p)->local_strreset_support; 2688 inp->fibnum = (*inp_p)->fibnum; 2689 inp->inp_starting_point_for_iterator = NULL; 2690 /* 2691 * copy in the authentication parameters from the 2692 * original endpoint 2693 */ 2694 if (inp->sctp_ep.local_hmacs) 2695 sctp_free_hmaclist(inp->sctp_ep.local_hmacs); 2696 inp->sctp_ep.local_hmacs = 2697 sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs); 2698 if (inp->sctp_ep.local_auth_chunks) 2699 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks); 2700 inp->sctp_ep.local_auth_chunks = 2701 sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks); 2702 2703 /* 2704 * Now we must move it from one hash table to 2705 * another and get the tcb in the right place. 2706 */ 2707 2708 /* 2709 * This is where the one-2-one socket is put into 2710 * the accept state waiting for the accept! 2711 */ 2712 if (*stcb) { 2713 SCTP_ADD_SUBSTATE(*stcb, SCTP_STATE_IN_ACCEPT_QUEUE); 2714 } 2715 sctp_move_pcb_and_assoc(*inp_p, inp, *stcb); 2716 2717 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2718 SCTP_TCB_UNLOCK((*stcb)); 2719 2720 sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb, 2721 0); 2722 SCTP_TCB_LOCK((*stcb)); 2723 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2724 2725 /* 2726 * now we must check to see if we were aborted while 2727 * the move was going on and the lock/unlock 2728 * happened. 2729 */ 2730 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 2731 /* 2732 * yep it was, we leave the assoc attached 2733 * to the socket since the sctp_inpcb_free() 2734 * call will send an abort for us. 2735 */ 2736 SCTP_INP_DECR_REF(inp); 2737 return (NULL); 2738 } 2739 SCTP_INP_DECR_REF(inp); 2740 /* Switch over to the new guy */ 2741 *inp_p = inp; 2742 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2743 if (send_int_conf) { 2744 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2745 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2746 } 2747 2748 /* 2749 * Pull it from the incomplete queue and wake the 2750 * guy 2751 */ 2752 soisconnected(so); 2753 return (m); 2754 } 2755 } 2756 if (notification) { 2757 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2758 } 2759 if (send_int_conf) { 2760 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2761 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2762 } 2763 return (m); 2764 } 2765 2766 static void 2767 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED, 2768 struct sctp_tcb *stcb, struct sctp_nets *net) 2769 { 2770 /* cp must not be used, others call this without a c-ack :-) */ 2771 struct sctp_association *asoc; 2772 struct sctp_tmit_chunk *chk; 2773 2774 SCTPDBG(SCTP_DEBUG_INPUT2, 2775 "sctp_handle_cookie_ack: handling COOKIE-ACK\n"); 2776 if ((stcb == NULL) || (net == NULL)) { 2777 return; 2778 } 2779 2780 asoc = &stcb->asoc; 2781 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 2782 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 2783 asoc->overall_error_count, 2784 0, 2785 SCTP_FROM_SCTP_INPUT, 2786 __LINE__); 2787 } 2788 asoc->overall_error_count = 0; 2789 sctp_stop_all_cookie_timers(stcb); 2790 /* process according to association state */ 2791 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) { 2792 /* state change only needed when I am in right state */ 2793 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2794 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 2795 sctp_start_net_timers(stcb); 2796 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2797 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2798 stcb->sctp_ep, stcb, NULL); 2799 } 2800 /* update RTO */ 2801 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 2802 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2803 if (asoc->overall_error_count == 0) { 2804 sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, 2805 SCTP_RTT_FROM_NON_DATA); 2806 } 2807 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 2808 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2809 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2810 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 2811 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2812 if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) { 2813 soisconnected(stcb->sctp_socket); 2814 } 2815 } 2816 /* 2817 * since we did not send a HB make sure we don't double 2818 * things 2819 */ 2820 net->hb_responded = 1; 2821 2822 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2823 /* 2824 * We don't need to do the asconf thing, nor hb or 2825 * autoclose if the socket is closed. 2826 */ 2827 goto closed_socket; 2828 } 2829 2830 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 2831 stcb, net); 2832 2833 if (stcb->asoc.sctp_autoclose_ticks && 2834 sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2835 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 2836 stcb->sctp_ep, stcb, NULL); 2837 } 2838 /* 2839 * send ASCONF if parameters are pending and ASCONFs are 2840 * allowed (eg. addresses changed when init/cookie echo were 2841 * in flight) 2842 */ 2843 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) && 2844 (stcb->asoc.asconf_supported == 1) && 2845 (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) { 2846 #ifdef SCTP_TIMER_BASED_ASCONF 2847 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, 2848 stcb->sctp_ep, stcb, 2849 stcb->asoc.primary_destination); 2850 #else 2851 sctp_send_asconf(stcb, stcb->asoc.primary_destination, 2852 SCTP_ADDR_NOT_LOCKED); 2853 #endif 2854 } 2855 } 2856 closed_socket: 2857 /* Toss the cookie if I can */ 2858 sctp_toss_old_cookies(stcb, asoc); 2859 /* Restart the timer if we have pending data */ 2860 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) { 2861 if (chk->whoTo != NULL) { 2862 break; 2863 } 2864 } 2865 if (chk != NULL) { 2866 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 2867 } 2868 } 2869 2870 static void 2871 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp, 2872 struct sctp_tcb *stcb) 2873 { 2874 struct sctp_nets *net; 2875 struct sctp_tmit_chunk *lchk; 2876 struct sctp_ecne_chunk bkup; 2877 uint8_t override_bit; 2878 uint32_t tsn, window_data_tsn; 2879 int len; 2880 unsigned int pkt_cnt; 2881 2882 len = ntohs(cp->ch.chunk_length); 2883 if (len == sizeof(struct old_sctp_ecne_chunk)) { 2884 /* Its the old format */ 2885 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk)); 2886 bkup.num_pkts_since_cwr = htonl(1); 2887 cp = &bkup; 2888 } 2889 SCTP_STAT_INCR(sctps_recvecne); 2890 tsn = ntohl(cp->tsn); 2891 pkt_cnt = ntohl(cp->num_pkts_since_cwr); 2892 lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead); 2893 if (lchk == NULL) { 2894 window_data_tsn = stcb->asoc.sending_seq - 1; 2895 } else { 2896 window_data_tsn = lchk->rec.data.tsn; 2897 } 2898 2899 /* Find where it was sent to if possible. */ 2900 net = NULL; 2901 TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) { 2902 if (lchk->rec.data.tsn == tsn) { 2903 net = lchk->whoTo; 2904 net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send; 2905 break; 2906 } 2907 if (SCTP_TSN_GT(lchk->rec.data.tsn, tsn)) { 2908 break; 2909 } 2910 } 2911 if (net == NULL) { 2912 /* 2913 * What to do. A previous send of a CWR was possibly lost. 2914 * See how old it is, we may have it marked on the actual 2915 * net. 2916 */ 2917 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 2918 if (tsn == net->last_cwr_tsn) { 2919 /* Found him, send it off */ 2920 break; 2921 } 2922 } 2923 if (net == NULL) { 2924 /* 2925 * If we reach here, we need to send a special CWR 2926 * that says hey, we did this a long time ago and 2927 * you lost the response. 2928 */ 2929 net = TAILQ_FIRST(&stcb->asoc.nets); 2930 if (net == NULL) { 2931 /* TSNH */ 2932 return; 2933 } 2934 override_bit = SCTP_CWR_REDUCE_OVERRIDE; 2935 } else { 2936 override_bit = 0; 2937 } 2938 } else { 2939 override_bit = 0; 2940 } 2941 if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) && 2942 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 2943 /* 2944 * JRS - Use the congestion control given in the pluggable 2945 * CC module 2946 */ 2947 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt); 2948 /* 2949 * We reduce once every RTT. So we will only lower cwnd at 2950 * the next sending seq i.e. the window_data_tsn 2951 */ 2952 net->cwr_window_tsn = window_data_tsn; 2953 net->ecn_ce_pkt_cnt += pkt_cnt; 2954 net->lost_cnt = pkt_cnt; 2955 net->last_cwr_tsn = tsn; 2956 } else { 2957 override_bit |= SCTP_CWR_IN_SAME_WINDOW; 2958 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) && 2959 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 2960 /* 2961 * Another loss in the same window update how many 2962 * marks/packets lost we have had. 2963 */ 2964 int cnt = 1; 2965 2966 if (pkt_cnt > net->lost_cnt) { 2967 /* Should be the case */ 2968 cnt = (pkt_cnt - net->lost_cnt); 2969 net->ecn_ce_pkt_cnt += cnt; 2970 } 2971 net->lost_cnt = pkt_cnt; 2972 net->last_cwr_tsn = tsn; 2973 /* 2974 * Most CC functions will ignore this call, since we 2975 * are in-window yet of the initial CE the peer saw. 2976 */ 2977 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt); 2978 } 2979 } 2980 /* 2981 * We always send a CWR this way if our previous one was lost our 2982 * peer will get an update, or if it is not time again to reduce we 2983 * still get the cwr to the peer. Note we set the override when we 2984 * could not find the TSN on the chunk or the destination network. 2985 */ 2986 sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit); 2987 } 2988 2989 static void 2990 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net) 2991 { 2992 /* 2993 * Here we get a CWR from the peer. We must look in the outqueue and 2994 * make sure that we have a covered ECNE in the control chunk part. 2995 * If so remove it. 2996 */ 2997 struct sctp_tmit_chunk *chk, *nchk; 2998 struct sctp_ecne_chunk *ecne; 2999 int override; 3000 uint32_t cwr_tsn; 3001 3002 cwr_tsn = ntohl(cp->tsn); 3003 override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE; 3004 TAILQ_FOREACH_SAFE(chk, &stcb->asoc.control_send_queue, sctp_next, nchk) { 3005 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) { 3006 continue; 3007 } 3008 if ((override == 0) && (chk->whoTo != net)) { 3009 /* Must be from the right src unless override is set */ 3010 continue; 3011 } 3012 ecne = mtod(chk->data, struct sctp_ecne_chunk *); 3013 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) { 3014 /* this covers this ECNE, we can remove it */ 3015 stcb->asoc.ecn_echo_cnt_onq--; 3016 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, 3017 sctp_next); 3018 stcb->asoc.ctrl_queue_cnt--; 3019 sctp_m_freem(chk->data); 3020 chk->data = NULL; 3021 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3022 if (override == 0) { 3023 break; 3024 } 3025 } 3026 } 3027 } 3028 3029 static void 3030 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED, 3031 struct sctp_tcb *stcb, struct sctp_nets *net) 3032 { 3033 3034 SCTPDBG(SCTP_DEBUG_INPUT2, 3035 "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n"); 3036 if (stcb == NULL) 3037 return; 3038 3039 /* process according to association state */ 3040 if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 3041 /* unexpected SHUTDOWN-COMPLETE... so ignore... */ 3042 SCTPDBG(SCTP_DEBUG_INPUT2, 3043 "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n"); 3044 SCTP_TCB_UNLOCK(stcb); 3045 return; 3046 } 3047 /* notify upper layer protocol */ 3048 if (stcb->sctp_socket) { 3049 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 3050 } 3051 #ifdef INVARIANTS 3052 if (!TAILQ_EMPTY(&stcb->asoc.send_queue) || 3053 !TAILQ_EMPTY(&stcb->asoc.sent_queue) || 3054 sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) { 3055 panic("Queues are not empty when handling SHUTDOWN-COMPLETE"); 3056 } 3057 #endif 3058 /* stop the timer */ 3059 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, 3060 SCTP_FROM_SCTP_INPUT + SCTP_LOC_24); 3061 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 3062 /* free the TCB */ 3063 SCTPDBG(SCTP_DEBUG_INPUT2, 3064 "sctp_handle_shutdown_complete: calls free-asoc\n"); 3065 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 3066 SCTP_FROM_SCTP_INPUT + SCTP_LOC_25); 3067 return; 3068 } 3069 3070 static int 3071 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc, 3072 struct sctp_nets *net, uint8_t flg) 3073 { 3074 switch (desc->chunk_type) { 3075 case SCTP_DATA: 3076 case SCTP_IDATA: 3077 /* find the tsn to resend (possibly) */ 3078 { 3079 uint32_t tsn; 3080 struct sctp_tmit_chunk *tp1; 3081 3082 tsn = ntohl(desc->tsn_ifany); 3083 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3084 if (tp1->rec.data.tsn == tsn) { 3085 /* found it */ 3086 break; 3087 } 3088 if (SCTP_TSN_GT(tp1->rec.data.tsn, tsn)) { 3089 /* not found */ 3090 tp1 = NULL; 3091 break; 3092 } 3093 } 3094 if (tp1 == NULL) { 3095 /* 3096 * Do it the other way , aka without paying 3097 * attention to queue seq order. 3098 */ 3099 SCTP_STAT_INCR(sctps_pdrpdnfnd); 3100 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3101 if (tp1->rec.data.tsn == tsn) { 3102 /* found it */ 3103 break; 3104 } 3105 } 3106 } 3107 if (tp1 == NULL) { 3108 SCTP_STAT_INCR(sctps_pdrptsnnf); 3109 } 3110 if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) { 3111 if (((flg & SCTP_BADCRC) == 0) && 3112 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3113 return (0); 3114 } 3115 if ((stcb->asoc.peers_rwnd == 0) && 3116 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3117 SCTP_STAT_INCR(sctps_pdrpdiwnp); 3118 return (0); 3119 } 3120 if (stcb->asoc.peers_rwnd == 0 && 3121 (flg & SCTP_FROM_MIDDLE_BOX)) { 3122 SCTP_STAT_INCR(sctps_pdrpdizrw); 3123 return (0); 3124 } 3125 if ((uint32_t)SCTP_BUF_LEN(tp1->data) < 3126 SCTP_DATA_CHUNK_OVERHEAD(stcb) + SCTP_NUM_DB_TO_VERIFY) { 3127 /* Payload not matching. */ 3128 SCTP_STAT_INCR(sctps_pdrpbadd); 3129 return (-1); 3130 } 3131 if (memcmp(mtod(tp1->data, caddr_t)+SCTP_DATA_CHUNK_OVERHEAD(stcb), 3132 desc->data_bytes, SCTP_NUM_DB_TO_VERIFY) != 0) { 3133 /* Payload not matching. */ 3134 SCTP_STAT_INCR(sctps_pdrpbadd); 3135 return (-1); 3136 } 3137 if (tp1->do_rtt) { 3138 /* 3139 * this guy had a RTO calculation 3140 * pending on it, cancel it 3141 */ 3142 if (tp1->whoTo->rto_needed == 0) { 3143 tp1->whoTo->rto_needed = 1; 3144 } 3145 tp1->do_rtt = 0; 3146 } 3147 SCTP_STAT_INCR(sctps_pdrpmark); 3148 if (tp1->sent != SCTP_DATAGRAM_RESEND) 3149 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3150 /* 3151 * mark it as if we were doing a FR, since 3152 * we will be getting gap ack reports behind 3153 * the info from the router. 3154 */ 3155 tp1->rec.data.doing_fast_retransmit = 1; 3156 /* 3157 * mark the tsn with what sequences can 3158 * cause a new FR. 3159 */ 3160 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) { 3161 tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq; 3162 } else { 3163 tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.tsn; 3164 } 3165 3166 /* restart the timer */ 3167 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3168 stcb, tp1->whoTo, 3169 SCTP_FROM_SCTP_INPUT + SCTP_LOC_26); 3170 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3171 stcb, tp1->whoTo); 3172 3173 /* fix counts and things */ 3174 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 3175 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP, 3176 tp1->whoTo->flight_size, 3177 tp1->book_size, 3178 (uint32_t)(uintptr_t)stcb, 3179 tp1->rec.data.tsn); 3180 } 3181 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3182 sctp_flight_size_decrease(tp1); 3183 sctp_total_flight_decrease(stcb, tp1); 3184 } 3185 tp1->sent = SCTP_DATAGRAM_RESEND; 3186 } { 3187 /* audit code */ 3188 unsigned int audit; 3189 3190 audit = 0; 3191 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3192 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3193 audit++; 3194 } 3195 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue, 3196 sctp_next) { 3197 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3198 audit++; 3199 } 3200 if (audit != stcb->asoc.sent_queue_retran_cnt) { 3201 SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n", 3202 audit, stcb->asoc.sent_queue_retran_cnt); 3203 #ifndef SCTP_AUDITING_ENABLED 3204 stcb->asoc.sent_queue_retran_cnt = audit; 3205 #endif 3206 } 3207 } 3208 } 3209 break; 3210 case SCTP_ASCONF: 3211 { 3212 struct sctp_tmit_chunk *asconf; 3213 3214 TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue, 3215 sctp_next) { 3216 if (asconf->rec.chunk_id.id == SCTP_ASCONF) { 3217 break; 3218 } 3219 } 3220 if (asconf) { 3221 if (asconf->sent != SCTP_DATAGRAM_RESEND) 3222 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3223 asconf->sent = SCTP_DATAGRAM_RESEND; 3224 asconf->snd_count--; 3225 } 3226 } 3227 break; 3228 case SCTP_INITIATION: 3229 /* resend the INIT */ 3230 stcb->asoc.dropped_special_cnt++; 3231 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) { 3232 /* 3233 * If we can get it in, in a few attempts we do 3234 * this, otherwise we let the timer fire. 3235 */ 3236 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, 3237 stcb, net, 3238 SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 3239 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 3240 } 3241 break; 3242 case SCTP_SELECTIVE_ACK: 3243 case SCTP_NR_SELECTIVE_ACK: 3244 /* resend the sack */ 3245 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED); 3246 break; 3247 case SCTP_HEARTBEAT_REQUEST: 3248 /* resend a demand HB */ 3249 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) { 3250 /* 3251 * Only retransmit if we KNOW we wont destroy the 3252 * tcb 3253 */ 3254 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 3255 } 3256 break; 3257 case SCTP_SHUTDOWN: 3258 sctp_send_shutdown(stcb, net); 3259 break; 3260 case SCTP_SHUTDOWN_ACK: 3261 sctp_send_shutdown_ack(stcb, net); 3262 break; 3263 case SCTP_COOKIE_ECHO: 3264 { 3265 struct sctp_tmit_chunk *cookie; 3266 3267 cookie = NULL; 3268 TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, 3269 sctp_next) { 3270 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) { 3271 break; 3272 } 3273 } 3274 if (cookie) { 3275 if (cookie->sent != SCTP_DATAGRAM_RESEND) 3276 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3277 cookie->sent = SCTP_DATAGRAM_RESEND; 3278 sctp_stop_all_cookie_timers(stcb); 3279 } 3280 } 3281 break; 3282 case SCTP_COOKIE_ACK: 3283 sctp_send_cookie_ack(stcb); 3284 break; 3285 case SCTP_ASCONF_ACK: 3286 /* resend last asconf ack */ 3287 sctp_send_asconf_ack(stcb); 3288 break; 3289 case SCTP_IFORWARD_CUM_TSN: 3290 case SCTP_FORWARD_CUM_TSN: 3291 send_forward_tsn(stcb, &stcb->asoc); 3292 break; 3293 /* can't do anything with these */ 3294 case SCTP_PACKET_DROPPED: 3295 case SCTP_INITIATION_ACK: /* this should not happen */ 3296 case SCTP_HEARTBEAT_ACK: 3297 case SCTP_ABORT_ASSOCIATION: 3298 case SCTP_OPERATION_ERROR: 3299 case SCTP_SHUTDOWN_COMPLETE: 3300 case SCTP_ECN_ECHO: 3301 case SCTP_ECN_CWR: 3302 default: 3303 break; 3304 } 3305 return (0); 3306 } 3307 3308 void 3309 sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list) 3310 { 3311 uint32_t i; 3312 uint16_t temp; 3313 3314 /* 3315 * We set things to 0xffffffff since this is the last delivered 3316 * sequence and we will be sending in 0 after the reset. 3317 */ 3318 3319 if (number_entries) { 3320 for (i = 0; i < number_entries; i++) { 3321 temp = ntohs(list[i]); 3322 if (temp >= stcb->asoc.streamincnt) { 3323 continue; 3324 } 3325 stcb->asoc.strmin[temp].last_mid_delivered = 0xffffffff; 3326 } 3327 } else { 3328 list = NULL; 3329 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3330 stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff; 3331 } 3332 } 3333 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3334 } 3335 3336 static void 3337 sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list) 3338 { 3339 uint32_t i; 3340 uint16_t temp; 3341 3342 if (number_entries > 0) { 3343 for (i = 0; i < number_entries; i++) { 3344 temp = ntohs(list[i]); 3345 if (temp >= stcb->asoc.streamoutcnt) { 3346 /* no such stream */ 3347 continue; 3348 } 3349 stcb->asoc.strmout[temp].next_mid_ordered = 0; 3350 stcb->asoc.strmout[temp].next_mid_unordered = 0; 3351 } 3352 } else { 3353 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3354 stcb->asoc.strmout[i].next_mid_ordered = 0; 3355 stcb->asoc.strmout[i].next_mid_unordered = 0; 3356 } 3357 } 3358 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3359 } 3360 3361 static void 3362 sctp_reset_clear_pending(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list) 3363 { 3364 uint32_t i; 3365 uint16_t temp; 3366 3367 if (number_entries > 0) { 3368 for (i = 0; i < number_entries; i++) { 3369 temp = ntohs(list[i]); 3370 if (temp >= stcb->asoc.streamoutcnt) { 3371 /* no such stream */ 3372 continue; 3373 } 3374 stcb->asoc.strmout[temp].state = SCTP_STREAM_OPEN; 3375 } 3376 } else { 3377 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3378 stcb->asoc.strmout[i].state = SCTP_STREAM_OPEN; 3379 } 3380 } 3381 } 3382 3383 struct sctp_stream_reset_request * 3384 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk) 3385 { 3386 struct sctp_association *asoc; 3387 struct sctp_chunkhdr *ch; 3388 struct sctp_stream_reset_request *r; 3389 struct sctp_tmit_chunk *chk; 3390 int len, clen; 3391 3392 asoc = &stcb->asoc; 3393 chk = asoc->str_reset; 3394 if (TAILQ_EMPTY(&asoc->control_send_queue) || 3395 (chk == NULL)) { 3396 asoc->stream_reset_outstanding = 0; 3397 return (NULL); 3398 } 3399 if (chk->data == NULL) { 3400 return (NULL); 3401 } 3402 if (bchk != NULL) { 3403 /* he wants a copy of the chk pointer */ 3404 *bchk = chk; 3405 } 3406 clen = chk->send_size; 3407 ch = mtod(chk->data, struct sctp_chunkhdr *); 3408 r = (struct sctp_stream_reset_request *)(ch + 1); 3409 if (ntohl(r->request_seq) == seq) { 3410 /* found it */ 3411 return (r); 3412 } 3413 len = SCTP_SIZE32(ntohs(r->ph.param_length)); 3414 if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) { 3415 /* move to the next one, there can only be a max of two */ 3416 r = (struct sctp_stream_reset_request *)((caddr_t)r + len); 3417 if (ntohl(r->request_seq) == seq) { 3418 return (r); 3419 } 3420 } 3421 /* that seq is not here */ 3422 return (NULL); 3423 } 3424 3425 static void 3426 sctp_clean_up_stream_reset(struct sctp_tcb *stcb) 3427 { 3428 struct sctp_association *asoc; 3429 struct sctp_tmit_chunk *chk; 3430 3431 asoc = &stcb->asoc; 3432 chk = asoc->str_reset; 3433 if (chk == NULL) { 3434 return; 3435 } 3436 asoc->str_reset = NULL; 3437 sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, 3438 NULL, SCTP_FROM_SCTP_INPUT + SCTP_LOC_28); 3439 TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next); 3440 asoc->ctrl_queue_cnt--; 3441 if (chk->data) { 3442 sctp_m_freem(chk->data); 3443 chk->data = NULL; 3444 } 3445 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3446 } 3447 3448 static int 3449 sctp_handle_stream_reset_response(struct sctp_tcb *stcb, 3450 uint32_t seq, uint32_t action, 3451 struct sctp_stream_reset_response *respin) 3452 { 3453 uint16_t type; 3454 int lparam_len; 3455 struct sctp_association *asoc = &stcb->asoc; 3456 struct sctp_tmit_chunk *chk; 3457 struct sctp_stream_reset_request *req_param; 3458 struct sctp_stream_reset_out_request *req_out_param; 3459 struct sctp_stream_reset_in_request *req_in_param; 3460 uint32_t number_entries; 3461 3462 if (asoc->stream_reset_outstanding == 0) { 3463 /* duplicate */ 3464 return (0); 3465 } 3466 if (seq == stcb->asoc.str_reset_seq_out) { 3467 req_param = sctp_find_stream_reset(stcb, seq, &chk); 3468 if (req_param != NULL) { 3469 stcb->asoc.str_reset_seq_out++; 3470 type = ntohs(req_param->ph.param_type); 3471 lparam_len = ntohs(req_param->ph.param_length); 3472 if (type == SCTP_STR_RESET_OUT_REQUEST) { 3473 int no_clear = 0; 3474 3475 req_out_param = (struct sctp_stream_reset_out_request *)req_param; 3476 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t); 3477 asoc->stream_reset_out_is_outstanding = 0; 3478 if (asoc->stream_reset_outstanding) 3479 asoc->stream_reset_outstanding--; 3480 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3481 /* do it */ 3482 sctp_reset_out_streams(stcb, number_entries, req_out_param->list_of_streams); 3483 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3484 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3485 } else if (action == SCTP_STREAM_RESET_RESULT_IN_PROGRESS) { 3486 /* 3487 * Set it up so we don't stop 3488 * retransmitting 3489 */ 3490 asoc->stream_reset_outstanding++; 3491 stcb->asoc.str_reset_seq_out--; 3492 asoc->stream_reset_out_is_outstanding = 1; 3493 no_clear = 1; 3494 } else { 3495 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3496 } 3497 if (no_clear == 0) { 3498 sctp_reset_clear_pending(stcb, number_entries, req_out_param->list_of_streams); 3499 } 3500 } else if (type == SCTP_STR_RESET_IN_REQUEST) { 3501 req_in_param = (struct sctp_stream_reset_in_request *)req_param; 3502 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t); 3503 if (asoc->stream_reset_outstanding) 3504 asoc->stream_reset_outstanding--; 3505 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3506 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb, 3507 number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3508 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3509 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb, 3510 number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3511 } 3512 } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) { 3513 /* Ok we now may have more streams */ 3514 int num_stream; 3515 3516 num_stream = stcb->asoc.strm_pending_add_size; 3517 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) { 3518 /* TSNH */ 3519 num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt; 3520 } 3521 stcb->asoc.strm_pending_add_size = 0; 3522 if (asoc->stream_reset_outstanding) 3523 asoc->stream_reset_outstanding--; 3524 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3525 /* Put the new streams into effect */ 3526 int i; 3527 3528 for (i = asoc->streamoutcnt; i < (asoc->streamoutcnt + num_stream); i++) { 3529 asoc->strmout[i].state = SCTP_STREAM_OPEN; 3530 } 3531 asoc->streamoutcnt += num_stream; 3532 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 3533 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3534 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3535 SCTP_STREAM_CHANGE_DENIED); 3536 } else { 3537 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3538 SCTP_STREAM_CHANGE_FAILED); 3539 } 3540 } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) { 3541 if (asoc->stream_reset_outstanding) 3542 asoc->stream_reset_outstanding--; 3543 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3544 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3545 SCTP_STREAM_CHANGE_DENIED); 3546 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3547 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3548 SCTP_STREAM_CHANGE_FAILED); 3549 } 3550 } else if (type == SCTP_STR_RESET_TSN_REQUEST) { 3551 /** 3552 * a) Adopt the new in tsn. 3553 * b) reset the map 3554 * c) Adopt the new out-tsn 3555 */ 3556 struct sctp_stream_reset_response_tsn *resp; 3557 struct sctp_forward_tsn_chunk fwdtsn; 3558 int abort_flag = 0; 3559 3560 if (respin == NULL) { 3561 /* huh ? */ 3562 return (0); 3563 } 3564 if (ntohs(respin->ph.param_length) < sizeof(struct sctp_stream_reset_response_tsn)) { 3565 return (0); 3566 } 3567 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3568 resp = (struct sctp_stream_reset_response_tsn *)respin; 3569 asoc->stream_reset_outstanding--; 3570 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3571 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3572 fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1); 3573 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3574 if (abort_flag) { 3575 return (1); 3576 } 3577 stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1); 3578 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3579 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3580 } 3581 3582 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 3583 stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn); 3584 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 3585 3586 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map; 3587 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size); 3588 3589 stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn); 3590 stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn; 3591 3592 sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL); 3593 sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL); 3594 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0); 3595 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3596 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3597 SCTP_ASSOC_RESET_DENIED); 3598 } else { 3599 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3600 SCTP_ASSOC_RESET_FAILED); 3601 } 3602 } 3603 /* get rid of the request and get the request flags */ 3604 if (asoc->stream_reset_outstanding == 0) { 3605 sctp_clean_up_stream_reset(stcb); 3606 } 3607 } 3608 } 3609 if (asoc->stream_reset_outstanding == 0) { 3610 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED); 3611 } 3612 return (0); 3613 } 3614 3615 static void 3616 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb, 3617 struct sctp_tmit_chunk *chk, 3618 struct sctp_stream_reset_in_request *req, int trunc) 3619 { 3620 uint32_t seq; 3621 int len, i; 3622 int number_entries; 3623 uint16_t temp; 3624 3625 /* 3626 * peer wants me to send a str-reset to him for my outgoing seq's if 3627 * seq_in is right. 3628 */ 3629 struct sctp_association *asoc = &stcb->asoc; 3630 3631 seq = ntohl(req->request_seq); 3632 if (asoc->str_reset_seq_in == seq) { 3633 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3634 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3635 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3636 } else if (trunc) { 3637 /* Can't do it, since they exceeded our buffer size */ 3638 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3639 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) { 3640 len = ntohs(req->ph.param_length); 3641 number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t)); 3642 if (number_entries) { 3643 for (i = 0; i < number_entries; i++) { 3644 temp = ntohs(req->list_of_streams[i]); 3645 if (temp >= stcb->asoc.streamoutcnt) { 3646 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3647 goto bad_boy; 3648 } 3649 req->list_of_streams[i] = temp; 3650 } 3651 for (i = 0; i < number_entries; i++) { 3652 if (stcb->asoc.strmout[req->list_of_streams[i]].state == SCTP_STREAM_OPEN) { 3653 stcb->asoc.strmout[req->list_of_streams[i]].state = SCTP_STREAM_RESET_PENDING; 3654 } 3655 } 3656 } else { 3657 /* Its all */ 3658 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3659 if (stcb->asoc.strmout[i].state == SCTP_STREAM_OPEN) 3660 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_PENDING; 3661 } 3662 } 3663 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3664 } else { 3665 /* Can't do it, since we have sent one out */ 3666 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 3667 } 3668 bad_boy: 3669 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3670 asoc->str_reset_seq_in++; 3671 } else if (asoc->str_reset_seq_in - 1 == seq) { 3672 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3673 } else if (asoc->str_reset_seq_in - 2 == seq) { 3674 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3675 } else { 3676 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3677 } 3678 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED); 3679 } 3680 3681 static int 3682 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb, 3683 struct sctp_tmit_chunk *chk, 3684 struct sctp_stream_reset_tsn_request *req) 3685 { 3686 /* reset all in and out and update the tsn */ 3687 /* 3688 * A) reset my str-seq's on in and out. B) Select a receive next, 3689 * and set cum-ack to it. Also process this selected number as a 3690 * fwd-tsn as well. C) set in the response my next sending seq. 3691 */ 3692 struct sctp_forward_tsn_chunk fwdtsn; 3693 struct sctp_association *asoc = &stcb->asoc; 3694 int abort_flag = 0; 3695 uint32_t seq; 3696 3697 seq = ntohl(req->request_seq); 3698 if (asoc->str_reset_seq_in == seq) { 3699 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3700 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 3701 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3702 } else { 3703 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3704 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3705 fwdtsn.ch.chunk_flags = 0; 3706 fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1); 3707 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3708 if (abort_flag) { 3709 return (1); 3710 } 3711 asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA; 3712 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3713 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3714 } 3715 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map; 3716 asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1; 3717 memset(asoc->mapping_array, 0, asoc->mapping_array_size); 3718 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 3719 memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size); 3720 atomic_add_int(&asoc->sending_seq, 1); 3721 /* save off historical data for retrans */ 3722 asoc->last_sending_seq[1] = asoc->last_sending_seq[0]; 3723 asoc->last_sending_seq[0] = asoc->sending_seq; 3724 asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0]; 3725 asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn; 3726 sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL); 3727 sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL); 3728 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3729 sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0); 3730 } 3731 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3732 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3733 asoc->str_reset_seq_in++; 3734 } else if (asoc->str_reset_seq_in - 1 == seq) { 3735 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3736 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3737 } else if (asoc->str_reset_seq_in - 2 == seq) { 3738 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1], 3739 asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]); 3740 } else { 3741 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3742 } 3743 return (0); 3744 } 3745 3746 static void 3747 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb, 3748 struct sctp_tmit_chunk *chk, 3749 struct sctp_stream_reset_out_request *req, int trunc) 3750 { 3751 uint32_t seq, tsn; 3752 int number_entries, len; 3753 struct sctp_association *asoc = &stcb->asoc; 3754 3755 seq = ntohl(req->request_seq); 3756 3757 /* now if its not a duplicate we process it */ 3758 if (asoc->str_reset_seq_in == seq) { 3759 len = ntohs(req->ph.param_length); 3760 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t)); 3761 /* 3762 * the sender is resetting, handle the list issue.. we must 3763 * a) verify if we can do the reset, if so no problem b) If 3764 * we can't do the reset we must copy the request. c) queue 3765 * it, and setup the data in processor to trigger it off 3766 * when needed and dequeue all the queued data. 3767 */ 3768 tsn = ntohl(req->send_reset_at_tsn); 3769 3770 /* move the reset action back one */ 3771 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3772 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3773 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3774 } else if (trunc) { 3775 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3776 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) { 3777 /* we can do it now */ 3778 sctp_reset_in_stream(stcb, number_entries, req->list_of_streams); 3779 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3780 } else { 3781 /* 3782 * we must queue it up and thus wait for the TSN's 3783 * to arrive that are at or before tsn 3784 */ 3785 struct sctp_stream_reset_list *liste; 3786 int siz; 3787 3788 siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t)); 3789 SCTP_MALLOC(liste, struct sctp_stream_reset_list *, 3790 siz, SCTP_M_STRESET); 3791 if (liste == NULL) { 3792 /* gak out of memory */ 3793 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3794 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3795 return; 3796 } 3797 liste->seq = seq; 3798 liste->tsn = tsn; 3799 liste->number_entries = number_entries; 3800 memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t)); 3801 TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp); 3802 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_IN_PROGRESS; 3803 } 3804 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3805 asoc->str_reset_seq_in++; 3806 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3807 /* 3808 * one seq back, just echo back last action since my 3809 * response was lost. 3810 */ 3811 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3812 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3813 /* 3814 * two seq back, just echo back last action since my 3815 * response was lost. 3816 */ 3817 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3818 } else { 3819 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3820 } 3821 } 3822 3823 static void 3824 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 3825 struct sctp_stream_reset_add_strm *str_add) 3826 { 3827 /* 3828 * Peer is requesting to add more streams. If its within our 3829 * max-streams we will allow it. 3830 */ 3831 uint32_t num_stream, i; 3832 uint32_t seq; 3833 struct sctp_association *asoc = &stcb->asoc; 3834 struct sctp_queued_to_read *ctl, *nctl; 3835 3836 /* Get the number. */ 3837 seq = ntohl(str_add->request_seq); 3838 num_stream = ntohs(str_add->number_of_streams); 3839 /* Now what would be the new total? */ 3840 if (asoc->str_reset_seq_in == seq) { 3841 num_stream += stcb->asoc.streamincnt; 3842 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3843 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 3844 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3845 } else if ((num_stream > stcb->asoc.max_inbound_streams) || 3846 (num_stream > 0xffff)) { 3847 /* We must reject it they ask for to many */ 3848 denied: 3849 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3850 } else { 3851 /* Ok, we can do that :-) */ 3852 struct sctp_stream_in *oldstrm; 3853 3854 /* save off the old */ 3855 oldstrm = stcb->asoc.strmin; 3856 SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *, 3857 (num_stream * sizeof(struct sctp_stream_in)), 3858 SCTP_M_STRMI); 3859 if (stcb->asoc.strmin == NULL) { 3860 stcb->asoc.strmin = oldstrm; 3861 goto denied; 3862 } 3863 /* copy off the old data */ 3864 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3865 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 3866 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue); 3867 stcb->asoc.strmin[i].sid = i; 3868 stcb->asoc.strmin[i].last_mid_delivered = oldstrm[i].last_mid_delivered; 3869 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started; 3870 stcb->asoc.strmin[i].pd_api_started = oldstrm[i].pd_api_started; 3871 /* now anything on those queues? */ 3872 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next_instrm, nctl) { 3873 TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next_instrm); 3874 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next_instrm); 3875 } 3876 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].uno_inqueue, next_instrm, nctl) { 3877 TAILQ_REMOVE(&oldstrm[i].uno_inqueue, ctl, next_instrm); 3878 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].uno_inqueue, ctl, next_instrm); 3879 } 3880 } 3881 /* Init the new streams */ 3882 for (i = stcb->asoc.streamincnt; i < num_stream; i++) { 3883 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 3884 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue); 3885 stcb->asoc.strmin[i].sid = i; 3886 stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff; 3887 stcb->asoc.strmin[i].pd_api_started = 0; 3888 stcb->asoc.strmin[i].delivery_started = 0; 3889 } 3890 SCTP_FREE(oldstrm, SCTP_M_STRMI); 3891 /* update the size */ 3892 stcb->asoc.streamincnt = num_stream; 3893 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3894 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 3895 } 3896 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3897 asoc->str_reset_seq_in++; 3898 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3899 /* 3900 * one seq back, just echo back last action since my 3901 * response was lost. 3902 */ 3903 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3904 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3905 /* 3906 * two seq back, just echo back last action since my 3907 * response was lost. 3908 */ 3909 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3910 } else { 3911 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3912 } 3913 } 3914 3915 static void 3916 sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 3917 struct sctp_stream_reset_add_strm *str_add) 3918 { 3919 /* 3920 * Peer is requesting to add more streams. If its within our 3921 * max-streams we will allow it. 3922 */ 3923 uint16_t num_stream; 3924 uint32_t seq; 3925 struct sctp_association *asoc = &stcb->asoc; 3926 3927 /* Get the number. */ 3928 seq = ntohl(str_add->request_seq); 3929 num_stream = ntohs(str_add->number_of_streams); 3930 /* Now what would be the new total? */ 3931 if (asoc->str_reset_seq_in == seq) { 3932 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3933 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 3934 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3935 } else if (stcb->asoc.stream_reset_outstanding) { 3936 /* We must reject it we have something pending */ 3937 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 3938 } else { 3939 /* Ok, we can do that :-) */ 3940 int mychk; 3941 3942 mychk = stcb->asoc.streamoutcnt; 3943 mychk += num_stream; 3944 if (mychk < 0x10000) { 3945 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3946 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 1, num_stream, 0, 1)) { 3947 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3948 } 3949 } else { 3950 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3951 } 3952 } 3953 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]); 3954 asoc->str_reset_seq_in++; 3955 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3956 /* 3957 * one seq back, just echo back last action since my 3958 * response was lost. 3959 */ 3960 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3961 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3962 /* 3963 * two seq back, just echo back last action since my 3964 * response was lost. 3965 */ 3966 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3967 } else { 3968 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3969 } 3970 } 3971 3972 #ifdef __GNUC__ 3973 __attribute__((noinline)) 3974 #endif 3975 static int 3976 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset, 3977 struct sctp_chunkhdr *ch_req) 3978 { 3979 uint16_t remaining_length, param_len, ptype; 3980 struct sctp_paramhdr pstore; 3981 uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE]; 3982 uint32_t seq = 0; 3983 int num_req = 0; 3984 int trunc = 0; 3985 struct sctp_tmit_chunk *chk; 3986 struct sctp_chunkhdr *ch; 3987 struct sctp_paramhdr *ph; 3988 int ret_code = 0; 3989 int num_param = 0; 3990 3991 /* now it may be a reset or a reset-response */ 3992 remaining_length = ntohs(ch_req->chunk_length) - sizeof(struct sctp_chunkhdr); 3993 3994 /* setup for adding the response */ 3995 sctp_alloc_a_chunk(stcb, chk); 3996 if (chk == NULL) { 3997 return (ret_code); 3998 } 3999 chk->copy_by_ref = 0; 4000 chk->rec.chunk_id.id = SCTP_STREAM_RESET; 4001 chk->rec.chunk_id.can_take_data = 0; 4002 chk->flags = 0; 4003 chk->asoc = &stcb->asoc; 4004 chk->no_fr_allowed = 0; 4005 chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr); 4006 chk->book_size_scale = 0; 4007 chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA); 4008 if (chk->data == NULL) { 4009 strres_nochunk: 4010 if (chk->data) { 4011 sctp_m_freem(chk->data); 4012 chk->data = NULL; 4013 } 4014 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 4015 return (ret_code); 4016 } 4017 SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD); 4018 4019 /* setup chunk parameters */ 4020 chk->sent = SCTP_DATAGRAM_UNSENT; 4021 chk->snd_count = 0; 4022 chk->whoTo = NULL; 4023 4024 ch = mtod(chk->data, struct sctp_chunkhdr *); 4025 ch->chunk_type = SCTP_STREAM_RESET; 4026 ch->chunk_flags = 0; 4027 ch->chunk_length = htons(chk->send_size); 4028 SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size); 4029 offset += sizeof(struct sctp_chunkhdr); 4030 while (remaining_length >= sizeof(struct sctp_paramhdr)) { 4031 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *)&pstore); 4032 if (ph == NULL) { 4033 /* TSNH */ 4034 break; 4035 } 4036 param_len = ntohs(ph->param_length); 4037 if ((param_len > remaining_length) || 4038 (param_len < (sizeof(struct sctp_paramhdr) + sizeof(uint32_t)))) { 4039 /* bad parameter length */ 4040 break; 4041 } 4042 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, sizeof(cstore)), 4043 (uint8_t *)&cstore); 4044 if (ph == NULL) { 4045 /* TSNH */ 4046 break; 4047 } 4048 ptype = ntohs(ph->param_type); 4049 num_param++; 4050 if (param_len > sizeof(cstore)) { 4051 trunc = 1; 4052 } else { 4053 trunc = 0; 4054 } 4055 if (num_param > SCTP_MAX_RESET_PARAMS) { 4056 /* hit the max of parameters already sorry.. */ 4057 break; 4058 } 4059 if (ptype == SCTP_STR_RESET_OUT_REQUEST) { 4060 struct sctp_stream_reset_out_request *req_out; 4061 4062 if (param_len < sizeof(struct sctp_stream_reset_out_request)) { 4063 break; 4064 } 4065 req_out = (struct sctp_stream_reset_out_request *)ph; 4066 num_req++; 4067 if (stcb->asoc.stream_reset_outstanding) { 4068 seq = ntohl(req_out->response_seq); 4069 if (seq == stcb->asoc.str_reset_seq_out) { 4070 /* implicit ack */ 4071 (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL); 4072 } 4073 } 4074 sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc); 4075 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) { 4076 struct sctp_stream_reset_add_strm *str_add; 4077 4078 if (param_len < sizeof(struct sctp_stream_reset_add_strm)) { 4079 break; 4080 } 4081 str_add = (struct sctp_stream_reset_add_strm *)ph; 4082 num_req++; 4083 sctp_handle_str_reset_add_strm(stcb, chk, str_add); 4084 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) { 4085 struct sctp_stream_reset_add_strm *str_add; 4086 4087 if (param_len < sizeof(struct sctp_stream_reset_add_strm)) { 4088 break; 4089 } 4090 str_add = (struct sctp_stream_reset_add_strm *)ph; 4091 num_req++; 4092 sctp_handle_str_reset_add_out_strm(stcb, chk, str_add); 4093 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) { 4094 struct sctp_stream_reset_in_request *req_in; 4095 4096 num_req++; 4097 req_in = (struct sctp_stream_reset_in_request *)ph; 4098 sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc); 4099 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) { 4100 struct sctp_stream_reset_tsn_request *req_tsn; 4101 4102 num_req++; 4103 req_tsn = (struct sctp_stream_reset_tsn_request *)ph; 4104 if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) { 4105 ret_code = 1; 4106 goto strres_nochunk; 4107 } 4108 /* no more */ 4109 break; 4110 } else if (ptype == SCTP_STR_RESET_RESPONSE) { 4111 struct sctp_stream_reset_response *resp; 4112 uint32_t result; 4113 4114 if (param_len < sizeof(struct sctp_stream_reset_response)) { 4115 break; 4116 } 4117 resp = (struct sctp_stream_reset_response *)ph; 4118 seq = ntohl(resp->response_seq); 4119 result = ntohl(resp->result); 4120 if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) { 4121 ret_code = 1; 4122 goto strres_nochunk; 4123 } 4124 } else { 4125 break; 4126 } 4127 offset += SCTP_SIZE32(param_len); 4128 if (remaining_length >= SCTP_SIZE32(param_len)) { 4129 remaining_length -= SCTP_SIZE32(param_len); 4130 } else { 4131 remaining_length = 0; 4132 } 4133 } 4134 if (num_req == 0) { 4135 /* we have no response free the stuff */ 4136 goto strres_nochunk; 4137 } 4138 /* ok we have a chunk to link in */ 4139 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, 4140 chk, 4141 sctp_next); 4142 stcb->asoc.ctrl_queue_cnt++; 4143 return (ret_code); 4144 } 4145 4146 /* 4147 * Handle a router or endpoints report of a packet loss, there are two ways 4148 * to handle this, either we get the whole packet and must disect it 4149 * ourselves (possibly with truncation and or corruption) or it is a summary 4150 * from a middle box that did the disectting for us. 4151 */ 4152 static void 4153 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp, 4154 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 4155 { 4156 struct sctp_chunk_desc desc; 4157 struct sctp_chunkhdr *chk_hdr; 4158 struct sctp_data_chunk *data_chunk; 4159 struct sctp_idata_chunk *idata_chunk; 4160 uint32_t bottle_bw, on_queue; 4161 uint32_t offset, chk_len; 4162 uint16_t pktdrp_len; 4163 uint8_t pktdrp_flags; 4164 4165 KASSERT(sizeof(struct sctp_pktdrop_chunk) <= limit, 4166 ("PKTDROP chunk too small")); 4167 pktdrp_flags = cp->ch.chunk_flags; 4168 pktdrp_len = ntohs(cp->ch.chunk_length); 4169 KASSERT(limit <= pktdrp_len, ("Inconsistent limit")); 4170 if (pktdrp_flags & SCTP_PACKET_TRUNCATED) { 4171 if (ntohs(cp->trunc_len) <= pktdrp_len - sizeof(struct sctp_pktdrop_chunk)) { 4172 /* The peer plays games with us. */ 4173 return; 4174 } 4175 } 4176 limit -= sizeof(struct sctp_pktdrop_chunk); 4177 offset = 0; 4178 if (offset == limit) { 4179 if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) { 4180 SCTP_STAT_INCR(sctps_pdrpbwrpt); 4181 } 4182 } else if (offset + sizeof(struct sctphdr) > limit) { 4183 /* Only a partial SCTP common header. */ 4184 SCTP_STAT_INCR(sctps_pdrpcrupt); 4185 offset = limit; 4186 } else { 4187 /* XXX: Check embedded SCTP common header. */ 4188 offset += sizeof(struct sctphdr); 4189 } 4190 /* Now parse through the chunks themselves. */ 4191 while (offset < limit) { 4192 if (offset + sizeof(struct sctp_chunkhdr) > limit) { 4193 SCTP_STAT_INCR(sctps_pdrpcrupt); 4194 break; 4195 } 4196 chk_hdr = (struct sctp_chunkhdr *)(cp->data + offset); 4197 desc.chunk_type = chk_hdr->chunk_type; 4198 /* get amount we need to move */ 4199 chk_len = (uint32_t)ntohs(chk_hdr->chunk_length); 4200 if (chk_len < sizeof(struct sctp_chunkhdr)) { 4201 /* Someone is lying... */ 4202 break; 4203 } 4204 if (desc.chunk_type == SCTP_DATA) { 4205 if (stcb->asoc.idata_supported) { 4206 /* Some is playing games with us. */ 4207 break; 4208 } 4209 if (chk_len <= sizeof(struct sctp_data_chunk)) { 4210 /* Some is playing games with us. */ 4211 break; 4212 } 4213 if (chk_len < sizeof(struct sctp_data_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_data_chunk) + SCTP_NUM_DB_TO_VERIFY > limit) { 4222 /* Not enough data in buffer. */ 4223 break; 4224 } 4225 data_chunk = (struct sctp_data_chunk *)(cp->data + offset); 4226 memcpy(desc.data_bytes, data_chunk + 1, SCTP_NUM_DB_TO_VERIFY); 4227 desc.tsn_ifany = data_chunk->dp.tsn; 4228 if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) { 4229 SCTP_STAT_INCR(sctps_pdrpmbda); 4230 } 4231 } else if (desc.chunk_type == SCTP_IDATA) { 4232 if (!stcb->asoc.idata_supported) { 4233 /* Some is playing games with us. */ 4234 break; 4235 } 4236 if (chk_len <= sizeof(struct sctp_idata_chunk)) { 4237 /* Some is playing games with us. */ 4238 break; 4239 } 4240 if (chk_len < sizeof(struct sctp_idata_chunk) + SCTP_NUM_DB_TO_VERIFY) { 4241 /* 4242 * Not enough data bytes available in the 4243 * chunk. 4244 */ 4245 SCTP_STAT_INCR(sctps_pdrpnedat); 4246 goto next_chunk; 4247 } 4248 if (offset + sizeof(struct sctp_idata_chunk) + SCTP_NUM_DB_TO_VERIFY > limit) { 4249 /* Not enough data in buffer. */ 4250 break; 4251 } 4252 idata_chunk = (struct sctp_idata_chunk *)(cp->data + offset); 4253 memcpy(desc.data_bytes, idata_chunk + 1, SCTP_NUM_DB_TO_VERIFY); 4254 desc.tsn_ifany = idata_chunk->dp.tsn; 4255 if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) { 4256 SCTP_STAT_INCR(sctps_pdrpmbda); 4257 } 4258 } else { 4259 if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) { 4260 SCTP_STAT_INCR(sctps_pdrpmbct); 4261 } 4262 } 4263 if (process_chunk_drop(stcb, &desc, net, pktdrp_flags)) { 4264 SCTP_STAT_INCR(sctps_pdrppdbrk); 4265 break; 4266 } 4267 next_chunk: 4268 offset += SCTP_SIZE32(chk_len); 4269 } 4270 /* Now update any rwnd --- possibly */ 4271 if ((pktdrp_flags & SCTP_FROM_MIDDLE_BOX) == 0) { 4272 /* From a peer, we get a rwnd report */ 4273 uint32_t a_rwnd; 4274 4275 SCTP_STAT_INCR(sctps_pdrpfehos); 4276 4277 bottle_bw = ntohl(cp->bottle_bw); 4278 on_queue = ntohl(cp->current_onq); 4279 if (bottle_bw && on_queue) { 4280 /* a rwnd report is in here */ 4281 if (bottle_bw > on_queue) 4282 a_rwnd = bottle_bw - on_queue; 4283 else 4284 a_rwnd = 0; 4285 4286 if (a_rwnd == 0) 4287 stcb->asoc.peers_rwnd = 0; 4288 else { 4289 if (a_rwnd > stcb->asoc.total_flight) { 4290 stcb->asoc.peers_rwnd = 4291 a_rwnd - stcb->asoc.total_flight; 4292 } else { 4293 stcb->asoc.peers_rwnd = 0; 4294 } 4295 if (stcb->asoc.peers_rwnd < 4296 stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 4297 /* SWS sender side engages */ 4298 stcb->asoc.peers_rwnd = 0; 4299 } 4300 } 4301 } 4302 } else { 4303 SCTP_STAT_INCR(sctps_pdrpfmbox); 4304 } 4305 4306 /* now middle boxes in sat networks get a cwnd bump */ 4307 if ((pktdrp_flags & SCTP_FROM_MIDDLE_BOX) && 4308 (stcb->asoc.sat_t3_loss_recovery == 0) && 4309 (stcb->asoc.sat_network)) { 4310 /* 4311 * This is debatable but for sat networks it makes sense 4312 * Note if a T3 timer has went off, we will prohibit any 4313 * changes to cwnd until we exit the t3 loss recovery. 4314 */ 4315 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb, 4316 net, cp, &bottle_bw, &on_queue); 4317 } 4318 } 4319 4320 /* 4321 * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to 4322 * still contain IP/SCTP header - stcb: is the tcb found for this packet - 4323 * offset: offset into the mbuf chain to first chunkhdr - length: is the 4324 * length of the complete packet outputs: - length: modified to remaining 4325 * length after control processing - netp: modified to new sctp_nets after 4326 * cookie-echo processing - return NULL to discard the packet (ie. no asoc, 4327 * bad packet,...) otherwise return the tcb for this packet 4328 */ 4329 #ifdef __GNUC__ 4330 __attribute__((noinline)) 4331 #endif 4332 static struct sctp_tcb * 4333 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length, 4334 struct sockaddr *src, struct sockaddr *dst, 4335 struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp, 4336 struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen, 4337 uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum, 4338 uint32_t vrf_id, uint16_t port) 4339 { 4340 struct sctp_association *asoc; 4341 struct mbuf *op_err; 4342 char msg[SCTP_DIAG_INFO_LEN]; 4343 uint32_t vtag_in; 4344 int num_chunks = 0; /* number of control chunks processed */ 4345 uint32_t chk_length, contiguous; 4346 int ret; 4347 int abort_no_unlock = 0; 4348 int ecne_seen = 0; 4349 int abort_flag; 4350 4351 /* 4352 * How big should this be, and should it be alloc'd? Lets try the 4353 * d-mtu-ceiling for now (2k) and that should hopefully work ... 4354 * until we get into jumbo grams and such.. 4355 */ 4356 uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE]; 4357 int got_auth = 0; 4358 uint32_t auth_offset = 0, auth_len = 0; 4359 int auth_skipped = 0; 4360 int asconf_cnt = 0; 4361 4362 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n", 4363 iphlen, *offset, length, (void *)stcb); 4364 4365 if (stcb) { 4366 SCTP_TCB_LOCK_ASSERT(stcb); 4367 } 4368 /* validate chunk header length... */ 4369 if (ntohs(ch->chunk_length) < sizeof(*ch)) { 4370 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n", 4371 ntohs(ch->chunk_length)); 4372 *offset = length; 4373 return (stcb); 4374 } 4375 /* 4376 * validate the verification tag 4377 */ 4378 vtag_in = ntohl(sh->v_tag); 4379 4380 if (ch->chunk_type == SCTP_INITIATION) { 4381 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n", 4382 ntohs(ch->chunk_length), vtag_in); 4383 if (vtag_in != 0) { 4384 /* protocol error- silently discard... */ 4385 SCTP_STAT_INCR(sctps_badvtag); 4386 if (stcb != NULL) { 4387 SCTP_TCB_UNLOCK(stcb); 4388 } 4389 return (NULL); 4390 } 4391 } else if (ch->chunk_type != SCTP_COOKIE_ECHO) { 4392 /* 4393 * If there is no stcb, skip the AUTH chunk and process 4394 * later after a stcb is found (to validate the lookup was 4395 * valid. 4396 */ 4397 if ((ch->chunk_type == SCTP_AUTHENTICATION) && 4398 (stcb == NULL) && 4399 (inp->auth_supported == 1)) { 4400 /* save this chunk for later processing */ 4401 auth_skipped = 1; 4402 auth_offset = *offset; 4403 auth_len = ntohs(ch->chunk_length); 4404 4405 /* (temporarily) move past this chunk */ 4406 *offset += SCTP_SIZE32(auth_len); 4407 if (*offset >= length) { 4408 /* no more data left in the mbuf chain */ 4409 *offset = length; 4410 return (NULL); 4411 } 4412 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4413 sizeof(struct sctp_chunkhdr), chunk_buf); 4414 } 4415 if (ch == NULL) { 4416 /* Help */ 4417 *offset = length; 4418 return (stcb); 4419 } 4420 if (ch->chunk_type == SCTP_COOKIE_ECHO) { 4421 goto process_control_chunks; 4422 } 4423 /* 4424 * first check if it's an ASCONF with an unknown src addr we 4425 * need to look inside to find the association 4426 */ 4427 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) { 4428 struct sctp_chunkhdr *asconf_ch = ch; 4429 uint32_t asconf_offset = 0, asconf_len = 0; 4430 4431 /* inp's refcount may be reduced */ 4432 SCTP_INP_INCR_REF(inp); 4433 4434 asconf_offset = *offset; 4435 do { 4436 asconf_len = ntohs(asconf_ch->chunk_length); 4437 if (asconf_len < sizeof(struct sctp_asconf_paramhdr)) 4438 break; 4439 stcb = sctp_findassociation_ep_asconf(m, 4440 *offset, 4441 dst, 4442 sh, &inp, netp, vrf_id); 4443 if (stcb != NULL) 4444 break; 4445 asconf_offset += SCTP_SIZE32(asconf_len); 4446 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset, 4447 sizeof(struct sctp_chunkhdr), chunk_buf); 4448 } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF); 4449 if (stcb == NULL) { 4450 /* 4451 * reduce inp's refcount if not reduced in 4452 * sctp_findassociation_ep_asconf(). 4453 */ 4454 SCTP_INP_DECR_REF(inp); 4455 } 4456 4457 /* now go back and verify any auth chunk to be sure */ 4458 if (auth_skipped && (stcb != NULL)) { 4459 struct sctp_auth_chunk *auth; 4460 4461 if (auth_len <= SCTP_CHUNK_BUFFER_SIZE) { 4462 auth = (struct sctp_auth_chunk *)sctp_m_getptr(m, auth_offset, auth_len, chunk_buf); 4463 got_auth = 1; 4464 auth_skipped = 0; 4465 } else { 4466 auth = NULL; 4467 } 4468 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, 4469 auth_offset)) { 4470 /* auth HMAC failed so dump it */ 4471 *offset = length; 4472 return (stcb); 4473 } else { 4474 /* remaining chunks are HMAC checked */ 4475 stcb->asoc.authenticated = 1; 4476 } 4477 } 4478 } 4479 if (stcb == NULL) { 4480 SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 4481 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4482 msg); 4483 /* no association, so it's out of the blue... */ 4484 sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, op_err, 4485 mflowtype, mflowid, inp->fibnum, 4486 vrf_id, port); 4487 *offset = length; 4488 return (NULL); 4489 } 4490 asoc = &stcb->asoc; 4491 /* ABORT and SHUTDOWN can use either v_tag... */ 4492 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) || 4493 (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) || 4494 (ch->chunk_type == SCTP_PACKET_DROPPED)) { 4495 /* Take the T-bit always into account. */ 4496 if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) && 4497 (vtag_in == asoc->my_vtag)) || 4498 (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) && 4499 (asoc->peer_vtag != htonl(0)) && 4500 (vtag_in == asoc->peer_vtag))) { 4501 /* this is valid */ 4502 } else { 4503 /* drop this packet... */ 4504 SCTP_STAT_INCR(sctps_badvtag); 4505 if (stcb != NULL) { 4506 SCTP_TCB_UNLOCK(stcb); 4507 } 4508 return (NULL); 4509 } 4510 } else { 4511 /* for all other chunks, vtag must match */ 4512 if (vtag_in != asoc->my_vtag) { 4513 /* invalid vtag... */ 4514 SCTPDBG(SCTP_DEBUG_INPUT3, 4515 "invalid vtag: %xh, expect %xh\n", 4516 vtag_in, asoc->my_vtag); 4517 SCTP_STAT_INCR(sctps_badvtag); 4518 if (stcb != NULL) { 4519 SCTP_TCB_UNLOCK(stcb); 4520 } 4521 *offset = length; 4522 return (NULL); 4523 } 4524 } 4525 } /* end if !SCTP_COOKIE_ECHO */ 4526 /* 4527 * process all control chunks... 4528 */ 4529 if (((ch->chunk_type == SCTP_SELECTIVE_ACK) || 4530 (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) || 4531 (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) && 4532 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 4533 /* implied cookie-ack.. we must have lost the ack */ 4534 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, 4535 *netp); 4536 } 4537 4538 process_control_chunks: 4539 while (IS_SCTP_CONTROL(ch)) { 4540 /* validate chunk length */ 4541 chk_length = ntohs(ch->chunk_length); 4542 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n", 4543 ch->chunk_type, chk_length); 4544 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length); 4545 if (chk_length < sizeof(*ch) || 4546 (*offset + (int)chk_length) > length) { 4547 *offset = length; 4548 return (stcb); 4549 } 4550 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks); 4551 /* 4552 * INIT and INIT-ACK only gets the init ack "header" portion 4553 * only because we don't have to process the peer's COOKIE. 4554 * All others get a complete chunk. 4555 */ 4556 switch (ch->chunk_type) { 4557 case SCTP_INITIATION: 4558 contiguous = sizeof(struct sctp_init_chunk); 4559 break; 4560 case SCTP_INITIATION_ACK: 4561 contiguous = sizeof(struct sctp_init_ack_chunk); 4562 break; 4563 default: 4564 contiguous = min(chk_length, sizeof(chunk_buf)); 4565 break; 4566 } 4567 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4568 contiguous, 4569 chunk_buf); 4570 if (ch == NULL) { 4571 *offset = length; 4572 return (stcb); 4573 } 4574 4575 num_chunks++; 4576 /* Save off the last place we got a control from */ 4577 if (stcb != NULL) { 4578 if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) { 4579 /* 4580 * allow last_control to be NULL if 4581 * ASCONF... ASCONF processing will find the 4582 * right net later 4583 */ 4584 if ((netp != NULL) && (*netp != NULL)) 4585 stcb->asoc.last_control_chunk_from = *netp; 4586 } 4587 } 4588 #ifdef SCTP_AUDITING_ENABLED 4589 sctp_audit_log(0xB0, ch->chunk_type); 4590 #endif 4591 4592 /* check to see if this chunk required auth, but isn't */ 4593 if ((stcb != NULL) && 4594 sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) && 4595 !stcb->asoc.authenticated) { 4596 /* "silently" ignore */ 4597 SCTP_STAT_INCR(sctps_recvauthmissing); 4598 goto next_chunk; 4599 } 4600 switch (ch->chunk_type) { 4601 case SCTP_INITIATION: 4602 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n"); 4603 /* The INIT chunk must be the only chunk. */ 4604 if ((num_chunks > 1) || 4605 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4606 /* 4607 * RFC 4960bis requires stopping the 4608 * processing of the packet. 4609 */ 4610 *offset = length; 4611 return (stcb); 4612 } 4613 /* Honor our resource limit. */ 4614 if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) { 4615 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 4616 sctp_abort_association(inp, stcb, m, iphlen, 4617 src, dst, sh, op_err, 4618 mflowtype, mflowid, 4619 vrf_id, port); 4620 *offset = length; 4621 return (NULL); 4622 } 4623 sctp_handle_init(m, iphlen, *offset, src, dst, sh, 4624 (struct sctp_init_chunk *)ch, inp, 4625 stcb, *netp, &abort_no_unlock, 4626 mflowtype, mflowid, 4627 vrf_id, port); 4628 *offset = length; 4629 if ((!abort_no_unlock) && (stcb != NULL)) { 4630 SCTP_TCB_UNLOCK(stcb); 4631 } 4632 return (NULL); 4633 break; 4634 case SCTP_PAD_CHUNK: 4635 break; 4636 case SCTP_INITIATION_ACK: 4637 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT_ACK\n"); 4638 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4639 /* We are not interested anymore */ 4640 if ((stcb != NULL) && (stcb->asoc.total_output_queue_size)) { 4641 ; 4642 } else { 4643 *offset = length; 4644 if (stcb != NULL) { 4645 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 4646 SCTP_FROM_SCTP_INPUT + SCTP_LOC_29); 4647 } 4648 return (NULL); 4649 } 4650 } 4651 /* The INIT-ACK chunk must be the only chunk. */ 4652 if ((num_chunks > 1) || 4653 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4654 *offset = length; 4655 return (stcb); 4656 } 4657 if ((netp != NULL) && (*netp != NULL)) { 4658 ret = sctp_handle_init_ack(m, iphlen, *offset, 4659 src, dst, sh, 4660 (struct sctp_init_ack_chunk *)ch, 4661 stcb, *netp, 4662 &abort_no_unlock, 4663 mflowtype, mflowid, 4664 vrf_id); 4665 } else { 4666 ret = -1; 4667 } 4668 *offset = length; 4669 if (abort_no_unlock) { 4670 return (NULL); 4671 } 4672 /* 4673 * Special case, I must call the output routine to 4674 * get the cookie echoed 4675 */ 4676 if ((stcb != NULL) && (ret == 0)) { 4677 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 4678 } 4679 return (stcb); 4680 break; 4681 case SCTP_SELECTIVE_ACK: 4682 case SCTP_NR_SELECTIVE_ACK: 4683 { 4684 int abort_now = 0; 4685 uint32_t a_rwnd, cum_ack; 4686 uint16_t num_seg, num_nr_seg, num_dup; 4687 uint8_t flags; 4688 int offset_seg, offset_dup; 4689 4690 SCTPDBG(SCTP_DEBUG_INPUT3, "%s\n", 4691 ch->chunk_type == SCTP_SELECTIVE_ACK ? "SCTP_SACK" : "SCTP_NR_SACK"); 4692 SCTP_STAT_INCR(sctps_recvsacks); 4693 if (stcb == NULL) { 4694 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing %s chunk\n", 4695 (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK"); 4696 break; 4697 } 4698 if (ch->chunk_type == SCTP_SELECTIVE_ACK) { 4699 if (chk_length < sizeof(struct sctp_sack_chunk)) { 4700 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n"); 4701 break; 4702 } 4703 } else { 4704 if (stcb->asoc.nrsack_supported == 0) { 4705 goto unknown_chunk; 4706 } 4707 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) { 4708 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR_SACK chunk, too small\n"); 4709 break; 4710 } 4711 } 4712 if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4713 /*- 4714 * If we have sent a shutdown-ack, we will pay no 4715 * attention to a sack sent in to us since 4716 * we don't care anymore. 4717 */ 4718 break; 4719 } 4720 flags = ch->chunk_flags; 4721 if (ch->chunk_type == SCTP_SELECTIVE_ACK) { 4722 struct sctp_sack_chunk *sack; 4723 4724 sack = (struct sctp_sack_chunk *)ch; 4725 cum_ack = ntohl(sack->sack.cum_tsn_ack); 4726 num_seg = ntohs(sack->sack.num_gap_ack_blks); 4727 num_nr_seg = 0; 4728 num_dup = ntohs(sack->sack.num_dup_tsns); 4729 a_rwnd = ntohl(sack->sack.a_rwnd); 4730 if (sizeof(struct sctp_sack_chunk) + 4731 num_seg * sizeof(struct sctp_gap_ack_block) + 4732 num_dup * sizeof(uint32_t) != chk_length) { 4733 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n"); 4734 break; 4735 } 4736 offset_seg = *offset + sizeof(struct sctp_sack_chunk); 4737 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 4738 } else { 4739 struct sctp_nr_sack_chunk *nr_sack; 4740 4741 nr_sack = (struct sctp_nr_sack_chunk *)ch; 4742 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack); 4743 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks); 4744 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks); 4745 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns); 4746 a_rwnd = ntohl(nr_sack->nr_sack.a_rwnd); 4747 if (sizeof(struct sctp_nr_sack_chunk) + 4748 (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) + 4749 num_dup * sizeof(uint32_t) != chk_length) { 4750 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n"); 4751 break; 4752 } 4753 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk); 4754 offset_dup = offset_seg + (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block); 4755 } 4756 SCTPDBG(SCTP_DEBUG_INPUT3, "%s process cum_ack:%x num_seg:%d a_rwnd:%d\n", 4757 (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK", 4758 cum_ack, num_seg, a_rwnd); 4759 stcb->asoc.seen_a_sack_this_pkt = 1; 4760 if ((stcb->asoc.pr_sctp_cnt == 0) && 4761 (num_seg == 0) && (num_nr_seg == 0) && 4762 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 4763 (stcb->asoc.saw_sack_with_frags == 0) && 4764 (stcb->asoc.saw_sack_with_nr_frags == 0) && 4765 (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) { 4766 /* 4767 * We have a SIMPLE sack having no 4768 * prior segments and data on sent 4769 * queue to be acked. Use the faster 4770 * path sack processing. We also 4771 * allow window update sacks with no 4772 * missing segments to go this way 4773 * too. 4774 */ 4775 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, 4776 &abort_now, ecne_seen); 4777 } else { 4778 if ((netp != NULL) && (*netp != NULL)) { 4779 sctp_handle_sack(m, offset_seg, offset_dup, stcb, 4780 num_seg, num_nr_seg, num_dup, &abort_now, flags, 4781 cum_ack, a_rwnd, ecne_seen); 4782 } 4783 } 4784 if (abort_now) { 4785 /* ABORT signal from sack processing */ 4786 *offset = length; 4787 return (NULL); 4788 } 4789 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 4790 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 4791 (stcb->asoc.stream_queue_cnt == 0)) { 4792 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 4793 } 4794 break; 4795 } 4796 case SCTP_HEARTBEAT_REQUEST: 4797 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n"); 4798 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 4799 SCTP_STAT_INCR(sctps_recvheartbeat); 4800 sctp_send_heartbeat_ack(stcb, m, *offset, 4801 chk_length, *netp); 4802 } 4803 break; 4804 case SCTP_HEARTBEAT_ACK: 4805 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT_ACK\n"); 4806 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) { 4807 /* Its not ours */ 4808 break; 4809 } 4810 SCTP_STAT_INCR(sctps_recvheartbeatack); 4811 if ((netp != NULL) && (*netp != NULL)) { 4812 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch, 4813 stcb, *netp); 4814 } 4815 break; 4816 case SCTP_ABORT_ASSOCIATION: 4817 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n", 4818 (void *)stcb); 4819 *offset = length; 4820 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 4821 if (sctp_handle_abort((struct sctp_abort_chunk *)ch, stcb, *netp)) { 4822 return (NULL); 4823 } else { 4824 return (stcb); 4825 } 4826 } else { 4827 return (NULL); 4828 } 4829 break; 4830 case SCTP_SHUTDOWN: 4831 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n", 4832 (void *)stcb); 4833 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) { 4834 break; 4835 } 4836 if ((netp != NULL) && (*netp != NULL)) { 4837 abort_flag = 0; 4838 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch, 4839 stcb, *netp, &abort_flag); 4840 if (abort_flag) { 4841 *offset = length; 4842 return (NULL); 4843 } 4844 } 4845 break; 4846 case SCTP_SHUTDOWN_ACK: 4847 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_ACK, stcb %p\n", (void *)stcb); 4848 if ((chk_length == sizeof(struct sctp_shutdown_ack_chunk)) && 4849 (stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 4850 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp); 4851 *offset = length; 4852 return (NULL); 4853 } 4854 break; 4855 case SCTP_OPERATION_ERROR: 4856 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP_ERR\n"); 4857 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL) && 4858 sctp_handle_error(ch, stcb, *netp, contiguous) < 0) { 4859 *offset = length; 4860 return (NULL); 4861 } 4862 break; 4863 case SCTP_COOKIE_ECHO: 4864 SCTPDBG(SCTP_DEBUG_INPUT3, 4865 "SCTP_COOKIE_ECHO, stcb %p\n", (void *)stcb); 4866 if ((stcb != NULL) && (stcb->asoc.total_output_queue_size > 0)) { 4867 ; 4868 } else { 4869 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4870 /* We are not interested anymore */ 4871 abend: 4872 if (stcb != NULL) { 4873 SCTP_TCB_UNLOCK(stcb); 4874 } 4875 *offset = length; 4876 return (NULL); 4877 } 4878 } 4879 /*- 4880 * First are we accepting? We do this again here 4881 * since it is possible that a previous endpoint WAS 4882 * listening responded to a INIT-ACK and then 4883 * closed. We opened and bound.. and are now no 4884 * longer listening. 4885 * 4886 * XXXGL: notes on checking listen queue length. 4887 * 1) SCTP_IS_LISTENING() doesn't necessarily mean 4888 * SOLISTENING(), because a listening "UDP type" 4889 * socket isn't listening in terms of the socket 4890 * layer. It is a normal data flow socket, that 4891 * can fork off new connections. Thus, we should 4892 * look into sol_qlen only in case we are !UDP. 4893 * 2) Checking sol_qlen in general requires locking 4894 * the socket, and this code lacks that. 4895 */ 4896 if ((stcb == NULL) && 4897 (!SCTP_IS_LISTENING(inp) || 4898 (!(inp->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE) && 4899 inp->sctp_socket->sol_qlen >= inp->sctp_socket->sol_qlimit))) { 4900 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 4901 (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) { 4902 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 4903 sctp_abort_association(inp, stcb, m, iphlen, 4904 src, dst, sh, op_err, 4905 mflowtype, mflowid, 4906 vrf_id, port); 4907 } 4908 *offset = length; 4909 return (NULL); 4910 } else { 4911 struct mbuf *ret_buf; 4912 struct sctp_inpcb *linp; 4913 struct sctp_tmit_chunk *chk; 4914 4915 if (stcb) { 4916 linp = NULL; 4917 } else { 4918 linp = inp; 4919 } 4920 4921 if (linp != NULL) { 4922 SCTP_ASOC_CREATE_LOCK(linp); 4923 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 4924 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) { 4925 SCTP_ASOC_CREATE_UNLOCK(linp); 4926 goto abend; 4927 } 4928 } 4929 4930 if (netp != NULL) { 4931 struct sctp_tcb *locked_stcb; 4932 4933 locked_stcb = stcb; 4934 ret_buf = 4935 sctp_handle_cookie_echo(m, iphlen, 4936 *offset, 4937 src, dst, 4938 sh, 4939 (struct sctp_cookie_echo_chunk *)ch, 4940 &inp, &stcb, netp, 4941 auth_skipped, 4942 auth_offset, 4943 auth_len, 4944 &locked_stcb, 4945 mflowtype, 4946 mflowid, 4947 vrf_id, 4948 port); 4949 if ((locked_stcb != NULL) && (locked_stcb != stcb)) { 4950 SCTP_TCB_UNLOCK(locked_stcb); 4951 } 4952 if (stcb != NULL) { 4953 SCTP_TCB_LOCK_ASSERT(stcb); 4954 } 4955 } else { 4956 ret_buf = NULL; 4957 } 4958 if (linp != NULL) { 4959 SCTP_ASOC_CREATE_UNLOCK(linp); 4960 } 4961 if (ret_buf == NULL) { 4962 if (stcb != NULL) { 4963 SCTP_TCB_UNLOCK(stcb); 4964 } 4965 SCTPDBG(SCTP_DEBUG_INPUT3, 4966 "GAK, null buffer\n"); 4967 *offset = length; 4968 return (NULL); 4969 } 4970 /* if AUTH skipped, see if it verified... */ 4971 if (auth_skipped) { 4972 got_auth = 1; 4973 auth_skipped = 0; 4974 } 4975 /* Restart the timer if we have pending data */ 4976 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 4977 if (chk->whoTo != NULL) { 4978 break; 4979 } 4980 } 4981 if (chk != NULL) { 4982 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 4983 } 4984 } 4985 break; 4986 case SCTP_COOKIE_ACK: 4987 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE_ACK, stcb %p\n", (void *)stcb); 4988 if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) { 4989 break; 4990 } 4991 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4992 /* We are not interested anymore */ 4993 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4994 ; 4995 } else if (stcb) { 4996 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 4997 SCTP_FROM_SCTP_INPUT + SCTP_LOC_30); 4998 *offset = length; 4999 return (NULL); 5000 } 5001 } 5002 if ((netp != NULL) && (*netp != NULL)) { 5003 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp); 5004 } 5005 break; 5006 case SCTP_ECN_ECHO: 5007 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_ECHO\n"); 5008 if (stcb == NULL) { 5009 break; 5010 } 5011 if (stcb->asoc.ecn_supported == 0) { 5012 goto unknown_chunk; 5013 } 5014 if ((chk_length != sizeof(struct sctp_ecne_chunk)) && 5015 (chk_length != sizeof(struct old_sctp_ecne_chunk))) { 5016 break; 5017 } 5018 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, stcb); 5019 ecne_seen = 1; 5020 break; 5021 case SCTP_ECN_CWR: 5022 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_CWR\n"); 5023 if (stcb == NULL) { 5024 break; 5025 } 5026 if (stcb->asoc.ecn_supported == 0) { 5027 goto unknown_chunk; 5028 } 5029 if (chk_length != sizeof(struct sctp_cwr_chunk)) { 5030 break; 5031 } 5032 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp); 5033 break; 5034 case SCTP_SHUTDOWN_COMPLETE: 5035 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_COMPLETE, stcb %p\n", (void *)stcb); 5036 /* must be first and only chunk */ 5037 if ((num_chunks > 1) || 5038 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 5039 *offset = length; 5040 return (stcb); 5041 } 5042 if ((chk_length == sizeof(struct sctp_shutdown_complete_chunk)) && 5043 (stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 5044 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch, 5045 stcb, *netp); 5046 *offset = length; 5047 return (NULL); 5048 } 5049 break; 5050 case SCTP_ASCONF: 5051 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n"); 5052 if (stcb != NULL) { 5053 if (stcb->asoc.asconf_supported == 0) { 5054 goto unknown_chunk; 5055 } 5056 sctp_handle_asconf(m, *offset, src, 5057 (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0); 5058 asconf_cnt++; 5059 } 5060 break; 5061 case SCTP_ASCONF_ACK: 5062 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF_ACK\n"); 5063 if (stcb == NULL) { 5064 break; 5065 } 5066 if (stcb->asoc.asconf_supported == 0) { 5067 goto unknown_chunk; 5068 } 5069 if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) { 5070 break; 5071 } 5072 if ((netp != NULL) && (*netp != NULL)) { 5073 /* He's alive so give him credit */ 5074 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5075 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5076 stcb->asoc.overall_error_count, 5077 0, 5078 SCTP_FROM_SCTP_INPUT, 5079 __LINE__); 5080 } 5081 stcb->asoc.overall_error_count = 0; 5082 sctp_handle_asconf_ack(m, *offset, 5083 (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock); 5084 if (abort_no_unlock) 5085 return (NULL); 5086 } 5087 break; 5088 case SCTP_FORWARD_CUM_TSN: 5089 case SCTP_IFORWARD_CUM_TSN: 5090 SCTPDBG(SCTP_DEBUG_INPUT3, "%s\n", 5091 ch->chunk_type == SCTP_FORWARD_CUM_TSN ? "FORWARD_TSN" : "I_FORWARD_TSN"); 5092 if (stcb == NULL) { 5093 break; 5094 } 5095 if (stcb->asoc.prsctp_supported == 0) { 5096 goto unknown_chunk; 5097 } 5098 if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) { 5099 break; 5100 } 5101 if (((stcb->asoc.idata_supported == 1) && (ch->chunk_type == SCTP_FORWARD_CUM_TSN)) || 5102 ((stcb->asoc.idata_supported == 0) && (ch->chunk_type == SCTP_IFORWARD_CUM_TSN))) { 5103 if (ch->chunk_type == SCTP_FORWARD_CUM_TSN) { 5104 SCTP_SNPRINTF(msg, sizeof(msg), "%s", "FORWARD-TSN chunk received when I-FORWARD-TSN was negotiated"); 5105 } else { 5106 SCTP_SNPRINTF(msg, sizeof(msg), "%s", "I-FORWARD-TSN chunk received when FORWARD-TSN was negotiated"); 5107 } 5108 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); 5109 sctp_abort_an_association(inp, stcb, op_err, false, SCTP_SO_NOT_LOCKED); 5110 *offset = length; 5111 return (NULL); 5112 } 5113 *fwd_tsn_seen = 1; 5114 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5115 /* We are not interested anymore */ 5116 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 5117 SCTP_FROM_SCTP_INPUT + SCTP_LOC_31); 5118 *offset = length; 5119 return (NULL); 5120 } 5121 /* 5122 * For sending a SACK this looks like DATA chunks. 5123 */ 5124 stcb->asoc.last_data_chunk_from = stcb->asoc.last_control_chunk_from; 5125 abort_flag = 0; 5126 sctp_handle_forward_tsn(stcb, 5127 (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset); 5128 if (abort_flag) { 5129 *offset = length; 5130 return (NULL); 5131 } 5132 break; 5133 case SCTP_STREAM_RESET: 5134 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n"); 5135 if (stcb == NULL) { 5136 break; 5137 } 5138 if (stcb->asoc.reconfig_supported == 0) { 5139 goto unknown_chunk; 5140 } 5141 if (chk_length < sizeof(struct sctp_stream_reset_tsn_req)) { 5142 break; 5143 } 5144 if (sctp_handle_stream_reset(stcb, m, *offset, ch)) { 5145 /* stop processing */ 5146 *offset = length; 5147 return (NULL); 5148 } 5149 break; 5150 case SCTP_PACKET_DROPPED: 5151 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n"); 5152 if (stcb == NULL) { 5153 break; 5154 } 5155 if (stcb->asoc.pktdrop_supported == 0) { 5156 goto unknown_chunk; 5157 } 5158 if (chk_length < sizeof(struct sctp_pktdrop_chunk)) { 5159 break; 5160 } 5161 if ((netp != NULL) && (*netp != NULL)) { 5162 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch, 5163 stcb, *netp, 5164 min(chk_length, contiguous)); 5165 } 5166 break; 5167 case SCTP_AUTHENTICATION: 5168 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n"); 5169 if (stcb == NULL) { 5170 /* save the first AUTH for later processing */ 5171 if (auth_skipped == 0) { 5172 auth_offset = *offset; 5173 auth_len = chk_length; 5174 auth_skipped = 1; 5175 } 5176 /* skip this chunk (temporarily) */ 5177 break; 5178 } 5179 if (stcb->asoc.auth_supported == 0) { 5180 goto unknown_chunk; 5181 } 5182 if ((chk_length < (sizeof(struct sctp_auth_chunk))) || 5183 (chk_length > (sizeof(struct sctp_auth_chunk) + 5184 SCTP_AUTH_DIGEST_LEN_MAX))) { 5185 /* Its not ours */ 5186 *offset = length; 5187 return (stcb); 5188 } 5189 if (got_auth == 1) { 5190 /* skip this chunk... it's already auth'd */ 5191 break; 5192 } 5193 got_auth = 1; 5194 if (sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch, m, *offset)) { 5195 /* auth HMAC failed so dump the packet */ 5196 *offset = length; 5197 return (stcb); 5198 } else { 5199 /* remaining chunks are HMAC checked */ 5200 stcb->asoc.authenticated = 1; 5201 } 5202 break; 5203 5204 default: 5205 unknown_chunk: 5206 /* it's an unknown chunk! */ 5207 if ((ch->chunk_type & 0x40) && 5208 (stcb != NULL) && 5209 (SCTP_GET_STATE(stcb) != SCTP_STATE_EMPTY) && 5210 (SCTP_GET_STATE(stcb) != SCTP_STATE_INUSE) && 5211 (SCTP_GET_STATE(stcb) != SCTP_STATE_COOKIE_WAIT)) { 5212 struct sctp_gen_error_cause *cause; 5213 int len; 5214 5215 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_gen_error_cause), 5216 0, M_NOWAIT, 1, MT_DATA); 5217 if (op_err != NULL) { 5218 len = min(SCTP_SIZE32(chk_length), (uint32_t)(length - *offset)); 5219 cause = mtod(op_err, struct sctp_gen_error_cause *); 5220 cause->code = htons(SCTP_CAUSE_UNRECOG_CHUNK); 5221 cause->length = htons((uint16_t)(len + sizeof(struct sctp_gen_error_cause))); 5222 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_gen_error_cause); 5223 SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(m, *offset, len, M_NOWAIT); 5224 if (SCTP_BUF_NEXT(op_err) != NULL) { 5225 #ifdef SCTP_MBUF_LOGGING 5226 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5227 sctp_log_mbc(SCTP_BUF_NEXT(op_err), SCTP_MBUF_ICOPY); 5228 } 5229 #endif 5230 sctp_queue_op_err(stcb, op_err); 5231 } else { 5232 sctp_m_freem(op_err); 5233 } 5234 } 5235 } 5236 if ((ch->chunk_type & 0x80) == 0) { 5237 /* discard this packet */ 5238 *offset = length; 5239 return (stcb); 5240 } /* else skip this bad chunk and continue... */ 5241 break; 5242 } /* switch (ch->chunk_type) */ 5243 5244 next_chunk: 5245 /* get the next chunk */ 5246 *offset += SCTP_SIZE32(chk_length); 5247 if (*offset >= length) { 5248 /* no more data left in the mbuf chain */ 5249 break; 5250 } 5251 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 5252 sizeof(struct sctp_chunkhdr), chunk_buf); 5253 if (ch == NULL) { 5254 *offset = length; 5255 return (stcb); 5256 } 5257 } /* while */ 5258 5259 if ((asconf_cnt > 0) && (stcb != NULL)) { 5260 sctp_send_asconf_ack(stcb); 5261 } 5262 return (stcb); 5263 } 5264 5265 /* 5266 * common input chunk processing (v4 and v6) 5267 */ 5268 void 5269 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length, 5270 struct sockaddr *src, struct sockaddr *dst, 5271 struct sctphdr *sh, struct sctp_chunkhdr *ch, 5272 uint8_t compute_crc, 5273 uint8_t ecn_bits, 5274 uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum, 5275 uint32_t vrf_id, uint16_t port) 5276 { 5277 uint32_t high_tsn; 5278 int fwd_tsn_seen = 0, data_processed = 0; 5279 struct mbuf *m = *mm, *op_err; 5280 char msg[SCTP_DIAG_INFO_LEN]; 5281 int un_sent; 5282 int cnt_ctrl_ready = 0; 5283 struct sctp_inpcb *inp = NULL, *inp_decr = NULL; 5284 struct sctp_tcb *stcb = NULL; 5285 struct sctp_nets *net = NULL; 5286 5287 SCTP_STAT_INCR(sctps_recvdatagrams); 5288 #ifdef SCTP_AUDITING_ENABLED 5289 sctp_audit_log(0xE0, 1); 5290 sctp_auditing(0, inp, stcb, net); 5291 #endif 5292 if (compute_crc != 0) { 5293 uint32_t check, calc_check; 5294 5295 check = sh->checksum; 5296 sh->checksum = 0; 5297 calc_check = sctp_calculate_cksum(m, iphlen); 5298 sh->checksum = check; 5299 if (calc_check != check) { 5300 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x m:%p mlen:%d iphlen:%d\n", 5301 calc_check, check, (void *)m, length, iphlen); 5302 stcb = sctp_findassociation_addr(m, offset, src, dst, 5303 sh, ch, &inp, &net, vrf_id); 5304 #if defined(INET) || defined(INET6) 5305 if ((ch->chunk_type != SCTP_INITIATION) && 5306 (net != NULL) && (net->port != port)) { 5307 if (net->port == 0) { 5308 /* UDP encapsulation turned on. */ 5309 net->mtu -= sizeof(struct udphdr); 5310 if (stcb->asoc.smallest_mtu > net->mtu) { 5311 sctp_pathmtu_adjustment(stcb, net->mtu); 5312 } 5313 } else if (port == 0) { 5314 /* UDP encapsulation turned off. */ 5315 net->mtu += sizeof(struct udphdr); 5316 /* XXX Update smallest_mtu */ 5317 } 5318 net->port = port; 5319 } 5320 #endif 5321 if (net != NULL) { 5322 net->flowtype = mflowtype; 5323 net->flowid = mflowid; 5324 } 5325 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5326 if ((inp != NULL) && (stcb != NULL)) { 5327 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1); 5328 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED); 5329 } else if ((inp != NULL) && (stcb == NULL)) { 5330 inp_decr = inp; 5331 } 5332 SCTP_STAT_INCR(sctps_badsum); 5333 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors); 5334 goto out; 5335 } 5336 } 5337 /* Destination port of 0 is illegal, based on RFC4960. */ 5338 if (sh->dest_port == 0) { 5339 SCTP_STAT_INCR(sctps_hdrops); 5340 goto out; 5341 } 5342 stcb = sctp_findassociation_addr(m, offset, src, dst, 5343 sh, ch, &inp, &net, vrf_id); 5344 #if defined(INET) || defined(INET6) 5345 if ((ch->chunk_type != SCTP_INITIATION) && 5346 (net != NULL) && (net->port != port)) { 5347 if (net->port == 0) { 5348 /* UDP encapsulation turned on. */ 5349 net->mtu -= sizeof(struct udphdr); 5350 if (stcb->asoc.smallest_mtu > net->mtu) { 5351 sctp_pathmtu_adjustment(stcb, net->mtu); 5352 } 5353 } else if (port == 0) { 5354 /* UDP encapsulation turned off. */ 5355 net->mtu += sizeof(struct udphdr); 5356 /* XXX Update smallest_mtu */ 5357 } 5358 net->port = port; 5359 } 5360 #endif 5361 if (net != NULL) { 5362 net->flowtype = mflowtype; 5363 net->flowid = mflowid; 5364 } 5365 if (inp == NULL) { 5366 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5367 SCTP_STAT_INCR(sctps_noport); 5368 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) { 5369 goto out; 5370 } 5371 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 5372 sctp_send_shutdown_complete2(src, dst, sh, 5373 mflowtype, mflowid, fibnum, 5374 vrf_id, port); 5375 goto out; 5376 } 5377 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) { 5378 goto out; 5379 } 5380 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) { 5381 if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) || 5382 ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) && 5383 (ch->chunk_type != SCTP_INIT))) { 5384 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5385 "Out of the blue"); 5386 sctp_send_abort(m, iphlen, src, dst, 5387 sh, 0, op_err, 5388 mflowtype, mflowid, fibnum, 5389 vrf_id, port); 5390 } 5391 } 5392 goto out; 5393 } else if (stcb == NULL) { 5394 inp_decr = inp; 5395 } 5396 SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n", 5397 (void *)m, iphlen, offset, length, (void *)stcb); 5398 if (stcb) { 5399 /* always clear this before beginning a packet */ 5400 stcb->asoc.authenticated = 0; 5401 stcb->asoc.seen_a_sack_this_pkt = 0; 5402 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n", 5403 (void *)stcb, stcb->asoc.state); 5404 5405 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) || 5406 (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) { 5407 /*- 5408 * If we hit here, we had a ref count 5409 * up when the assoc was aborted and the 5410 * timer is clearing out the assoc, we should 5411 * NOT respond to any packet.. its OOTB. 5412 */ 5413 SCTP_TCB_UNLOCK(stcb); 5414 stcb = NULL; 5415 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5416 SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5417 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5418 msg); 5419 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5420 mflowtype, mflowid, inp->fibnum, 5421 vrf_id, port); 5422 goto out; 5423 } 5424 } 5425 if (IS_SCTP_CONTROL(ch)) { 5426 /* process the control portion of the SCTP packet */ 5427 /* sa_ignore NO_NULL_CHK */ 5428 stcb = sctp_process_control(m, iphlen, &offset, length, 5429 src, dst, sh, ch, 5430 inp, stcb, &net, &fwd_tsn_seen, 5431 mflowtype, mflowid, fibnum, 5432 vrf_id, port); 5433 if (stcb) { 5434 /* 5435 * This covers us if the cookie-echo was there and 5436 * it changes our INP. 5437 */ 5438 inp = stcb->sctp_ep; 5439 #if defined(INET) || defined(INET6) 5440 if ((ch->chunk_type != SCTP_INITIATION) && 5441 (net != NULL) && (net->port != port)) { 5442 if (net->port == 0) { 5443 /* UDP encapsulation turned on. */ 5444 net->mtu -= sizeof(struct udphdr); 5445 if (stcb->asoc.smallest_mtu > net->mtu) { 5446 sctp_pathmtu_adjustment(stcb, net->mtu); 5447 } 5448 } else if (port == 0) { 5449 /* UDP encapsulation turned off. */ 5450 net->mtu += sizeof(struct udphdr); 5451 /* XXX Update smallest_mtu */ 5452 } 5453 net->port = port; 5454 } 5455 #endif 5456 } 5457 } else { 5458 /* 5459 * no control chunks, so pre-process DATA chunks (these 5460 * checks are taken care of by control processing) 5461 */ 5462 5463 /* 5464 * if DATA only packet, and auth is required, then punt... 5465 * can't have authenticated without any AUTH (control) 5466 * chunks 5467 */ 5468 if ((stcb != NULL) && 5469 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) { 5470 /* "silently" ignore */ 5471 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5472 SCTP_STAT_INCR(sctps_recvauthmissing); 5473 goto out; 5474 } 5475 if (stcb == NULL) { 5476 /* out of the blue DATA chunk */ 5477 SCTP_PROBE5(receive, NULL, NULL, m, NULL, sh); 5478 SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5479 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5480 msg); 5481 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5482 mflowtype, mflowid, fibnum, 5483 vrf_id, port); 5484 goto out; 5485 } 5486 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) { 5487 /* v_tag mismatch! */ 5488 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5489 SCTP_STAT_INCR(sctps_badvtag); 5490 goto out; 5491 } 5492 } 5493 5494 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5495 if (stcb == NULL) { 5496 /* 5497 * no valid TCB for this packet, or we found it's a bad 5498 * packet while processing control, or we're done with this 5499 * packet (done or skip rest of data), so we drop it... 5500 */ 5501 goto out; 5502 } 5503 5504 /* 5505 * DATA chunk processing 5506 */ 5507 /* plow through the data chunks while length > offset */ 5508 5509 /* 5510 * Rest should be DATA only. Check authentication state if AUTH for 5511 * DATA is required. 5512 */ 5513 if ((length > offset) && 5514 (stcb != NULL) && 5515 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) && 5516 !stcb->asoc.authenticated) { 5517 /* "silently" ignore */ 5518 SCTP_STAT_INCR(sctps_recvauthmissing); 5519 SCTPDBG(SCTP_DEBUG_AUTH1, 5520 "Data chunk requires AUTH, skipped\n"); 5521 goto trigger_send; 5522 } 5523 if (length > offset) { 5524 int retval; 5525 5526 /* 5527 * First check to make sure our state is correct. We would 5528 * not get here unless we really did have a tag, so we don't 5529 * abort if this happens, just dump the chunk silently. 5530 */ 5531 switch (SCTP_GET_STATE(stcb)) { 5532 case SCTP_STATE_COOKIE_ECHOED: 5533 /* 5534 * we consider data with valid tags in this state 5535 * shows us the cookie-ack was lost. Imply it was 5536 * there. 5537 */ 5538 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net); 5539 break; 5540 case SCTP_STATE_COOKIE_WAIT: 5541 /* 5542 * We consider OOTB any data sent during asoc setup. 5543 */ 5544 SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5545 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5546 msg); 5547 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5548 mflowtype, mflowid, inp->fibnum, 5549 vrf_id, port); 5550 goto out; 5551 /* sa_ignore NOTREACHED */ 5552 break; 5553 case SCTP_STATE_EMPTY: /* should not happen */ 5554 case SCTP_STATE_INUSE: /* should not happen */ 5555 case SCTP_STATE_SHUTDOWN_RECEIVED: /* This is a peer error */ 5556 case SCTP_STATE_SHUTDOWN_ACK_SENT: 5557 default: 5558 goto out; 5559 /* sa_ignore NOTREACHED */ 5560 break; 5561 case SCTP_STATE_OPEN: 5562 case SCTP_STATE_SHUTDOWN_SENT: 5563 break; 5564 } 5565 /* plow through the data chunks while length > offset */ 5566 retval = sctp_process_data(mm, iphlen, &offset, length, 5567 inp, stcb, net, &high_tsn); 5568 if (retval == 2) { 5569 /* 5570 * The association aborted, NO UNLOCK needed since 5571 * the association is destroyed. 5572 */ 5573 stcb = NULL; 5574 goto out; 5575 } 5576 if (retval == 0) { 5577 data_processed = 1; 5578 } 5579 /* 5580 * Anything important needs to have been m_copy'ed in 5581 * process_data 5582 */ 5583 } 5584 5585 /* take care of ecn */ 5586 if ((data_processed == 1) && 5587 (stcb->asoc.ecn_supported == 1) && 5588 ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) { 5589 /* Yep, we need to add a ECNE */ 5590 sctp_send_ecn_echo(stcb, net, high_tsn); 5591 } 5592 5593 if ((data_processed == 0) && (fwd_tsn_seen)) { 5594 int was_a_gap; 5595 uint32_t highest_tsn; 5596 5597 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) { 5598 highest_tsn = stcb->asoc.highest_tsn_inside_nr_map; 5599 } else { 5600 highest_tsn = stcb->asoc.highest_tsn_inside_map; 5601 } 5602 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn); 5603 stcb->asoc.send_sack = 1; 5604 sctp_sack_check(stcb, was_a_gap); 5605 } else if (fwd_tsn_seen) { 5606 stcb->asoc.send_sack = 1; 5607 } 5608 /* trigger send of any chunks in queue... */ 5609 trigger_send: 5610 #ifdef SCTP_AUDITING_ENABLED 5611 sctp_audit_log(0xE0, 2); 5612 sctp_auditing(1, inp, stcb, net); 5613 #endif 5614 SCTPDBG(SCTP_DEBUG_INPUT1, 5615 "Check for chunk output prw:%d tqe:%d tf=%d\n", 5616 stcb->asoc.peers_rwnd, 5617 TAILQ_EMPTY(&stcb->asoc.control_send_queue), 5618 stcb->asoc.total_flight); 5619 un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight); 5620 if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 5621 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq; 5622 } 5623 if (!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue) || 5624 cnt_ctrl_ready || 5625 stcb->asoc.trigger_reset || 5626 ((un_sent > 0) && 5627 (stcb->asoc.peers_rwnd > 0 || stcb->asoc.total_flight == 0))) { 5628 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n"); 5629 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 5630 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n"); 5631 } 5632 #ifdef SCTP_AUDITING_ENABLED 5633 sctp_audit_log(0xE0, 3); 5634 sctp_auditing(2, inp, stcb, net); 5635 #endif 5636 out: 5637 if (stcb != NULL) { 5638 SCTP_TCB_UNLOCK(stcb); 5639 } 5640 if (inp_decr != NULL) { 5641 /* reduce ref-count */ 5642 SCTP_INP_WLOCK(inp_decr); 5643 SCTP_INP_DECR_REF(inp_decr); 5644 SCTP_INP_WUNLOCK(inp_decr); 5645 } 5646 return; 5647 } 5648 5649 #ifdef INET 5650 void 5651 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port) 5652 { 5653 struct mbuf *m; 5654 int iphlen; 5655 uint32_t vrf_id = 0; 5656 uint8_t ecn_bits; 5657 struct sockaddr_in src, dst; 5658 struct ip *ip; 5659 struct sctphdr *sh; 5660 struct sctp_chunkhdr *ch; 5661 int length, offset; 5662 uint8_t compute_crc; 5663 uint32_t mflowid; 5664 uint8_t mflowtype; 5665 uint16_t fibnum; 5666 5667 iphlen = off; 5668 if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) { 5669 SCTP_RELEASE_PKT(i_pak); 5670 return; 5671 } 5672 m = SCTP_HEADER_TO_CHAIN(i_pak); 5673 #ifdef SCTP_MBUF_LOGGING 5674 /* Log in any input mbufs */ 5675 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5676 sctp_log_mbc(m, SCTP_MBUF_INPUT); 5677 } 5678 #endif 5679 #ifdef SCTP_PACKET_LOGGING 5680 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) { 5681 sctp_packet_log(m); 5682 } 5683 #endif 5684 SCTPDBG(SCTP_DEBUG_CRCOFFLOAD, 5685 "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n", 5686 m->m_pkthdr.len, 5687 if_name(m->m_pkthdr.rcvif), 5688 (int)m->m_pkthdr.csum_flags, CSUM_BITS); 5689 mflowid = m->m_pkthdr.flowid; 5690 mflowtype = M_HASHTYPE_GET(m); 5691 fibnum = M_GETFIB(m); 5692 SCTP_STAT_INCR(sctps_recvpackets); 5693 SCTP_STAT_INCR_COUNTER64(sctps_inpackets); 5694 /* Get IP, SCTP, and first chunk header together in the first mbuf. */ 5695 offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr); 5696 if (SCTP_BUF_LEN(m) < offset) { 5697 if ((m = m_pullup(m, offset)) == NULL) { 5698 SCTP_STAT_INCR(sctps_hdrops); 5699 return; 5700 } 5701 } 5702 ip = mtod(m, struct ip *); 5703 sh = (struct sctphdr *)((caddr_t)ip + iphlen); 5704 ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr)); 5705 offset -= sizeof(struct sctp_chunkhdr); 5706 memset(&src, 0, sizeof(struct sockaddr_in)); 5707 src.sin_family = AF_INET; 5708 src.sin_len = sizeof(struct sockaddr_in); 5709 src.sin_port = sh->src_port; 5710 src.sin_addr = ip->ip_src; 5711 memset(&dst, 0, sizeof(struct sockaddr_in)); 5712 dst.sin_family = AF_INET; 5713 dst.sin_len = sizeof(struct sockaddr_in); 5714 dst.sin_port = sh->dest_port; 5715 dst.sin_addr = ip->ip_dst; 5716 length = ntohs(ip->ip_len); 5717 /* Validate mbuf chain length with IP payload length. */ 5718 if (SCTP_HEADER_LEN(m) != length) { 5719 SCTPDBG(SCTP_DEBUG_INPUT1, 5720 "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m)); 5721 SCTP_STAT_INCR(sctps_hdrops); 5722 goto out; 5723 } 5724 /* SCTP does not allow broadcasts or multicasts */ 5725 if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) { 5726 goto out; 5727 } 5728 if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) { 5729 goto out; 5730 } 5731 ecn_bits = ip->ip_tos; 5732 if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) { 5733 SCTP_STAT_INCR(sctps_recvhwcrc); 5734 compute_crc = 0; 5735 } else { 5736 SCTP_STAT_INCR(sctps_recvswcrc); 5737 compute_crc = 1; 5738 } 5739 sctp_common_input_processing(&m, iphlen, offset, length, 5740 (struct sockaddr *)&src, 5741 (struct sockaddr *)&dst, 5742 sh, ch, 5743 compute_crc, 5744 ecn_bits, 5745 mflowtype, mflowid, fibnum, 5746 vrf_id, port); 5747 out: 5748 if (m) { 5749 sctp_m_freem(m); 5750 } 5751 return; 5752 } 5753 5754 #if defined(SCTP_MCORE_INPUT) && defined(SMP) 5755 extern int *sctp_cpuarry; 5756 #endif 5757 5758 int 5759 sctp_input(struct mbuf **mp, int *offp, int proto SCTP_UNUSED) 5760 { 5761 struct mbuf *m; 5762 int off; 5763 5764 m = *mp; 5765 off = *offp; 5766 #if defined(SCTP_MCORE_INPUT) && defined(SMP) 5767 if (mp_ncpus > 1) { 5768 struct ip *ip; 5769 struct sctphdr *sh; 5770 int offset; 5771 int cpu_to_use; 5772 uint32_t flowid, tag; 5773 5774 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) { 5775 flowid = m->m_pkthdr.flowid; 5776 } else { 5777 /* 5778 * No flow id built by lower layers fix it so we 5779 * create one. 5780 */ 5781 offset = off + sizeof(struct sctphdr); 5782 if (SCTP_BUF_LEN(m) < offset) { 5783 if ((m = m_pullup(m, offset)) == NULL) { 5784 SCTP_STAT_INCR(sctps_hdrops); 5785 return (IPPROTO_DONE); 5786 } 5787 } 5788 ip = mtod(m, struct ip *); 5789 sh = (struct sctphdr *)((caddr_t)ip + off); 5790 tag = htonl(sh->v_tag); 5791 flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port); 5792 m->m_pkthdr.flowid = flowid; 5793 M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE_HASH); 5794 } 5795 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus]; 5796 sctp_queue_to_mcore(m, off, cpu_to_use); 5797 return (IPPROTO_DONE); 5798 } 5799 #endif 5800 sctp_input_with_port(m, off, 0); 5801 return (IPPROTO_DONE); 5802 } 5803 #endif 5804