1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved. 5 * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved. 6 * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions are met: 10 * 11 * a) Redistributions of source code must retain the above copyright notice, 12 * this list of conditions and the following disclaimer. 13 * 14 * b) Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in 16 * the documentation and/or other materials provided with the distribution. 17 * 18 * c) Neither the name of Cisco Systems, Inc. nor the names of its 19 * contributors may be used to endorse or promote products derived 20 * from this software without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 23 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 24 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 26 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 28 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 29 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 30 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 31 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 32 * THE POSSIBILITY OF SUCH DAMAGE. 33 */ 34 35 #include <sys/cdefs.h> 36 __FBSDID("$FreeBSD$"); 37 38 #include <netinet/sctp_os.h> 39 #include <netinet/sctp_var.h> 40 #include <netinet/sctp_sysctl.h> 41 #include <netinet/sctp_pcb.h> 42 #include <netinet/sctp_header.h> 43 #include <netinet/sctputil.h> 44 #include <netinet/sctp_output.h> 45 #include <netinet/sctp_input.h> 46 #include <netinet/sctp_auth.h> 47 #include <netinet/sctp_indata.h> 48 #include <netinet/sctp_asconf.h> 49 #include <netinet/sctp_bsd_addr.h> 50 #include <netinet/sctp_timer.h> 51 #include <netinet/sctp_crc32.h> 52 #include <netinet/sctp_kdtrace.h> 53 #if defined(INET) || defined(INET6) 54 #include <netinet/udp.h> 55 #endif 56 #include <sys/smp.h> 57 58 static void 59 sctp_stop_all_cookie_timers(struct sctp_tcb *stcb) 60 { 61 struct sctp_nets *net; 62 63 /* 64 * This now not only stops all cookie timers it also stops any INIT 65 * timers as well. This will make sure that the timers are stopped 66 * in all collision cases. 67 */ 68 SCTP_TCB_LOCK_ASSERT(stcb); 69 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 70 if (net->rxt_timer.type == SCTP_TIMER_TYPE_COOKIE) { 71 sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE, 72 stcb->sctp_ep, 73 stcb, 74 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_1); 75 } else if (net->rxt_timer.type == SCTP_TIMER_TYPE_INIT) { 76 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, 77 stcb->sctp_ep, 78 stcb, 79 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_2); 80 } 81 } 82 } 83 84 /* INIT handler */ 85 static void 86 sctp_handle_init(struct mbuf *m, int iphlen, int offset, 87 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 88 struct sctp_init_chunk *cp, struct sctp_inpcb *inp, 89 struct sctp_tcb *stcb, struct sctp_nets *net, 90 uint8_t mflowtype, uint32_t mflowid, 91 uint32_t vrf_id, uint16_t port) 92 { 93 struct sctp_init *init; 94 struct mbuf *op_err; 95 96 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_init: handling INIT tcb:%p\n", 97 (void *)stcb); 98 if (stcb == NULL) { 99 SCTP_INP_RLOCK(inp); 100 } 101 /* Validate parameters */ 102 init = &cp->init; 103 if (ntohl(init->initiate_tag) == 0) { 104 goto outnow; 105 } 106 if ((ntohl(init->a_rwnd) < SCTP_MIN_RWND) || 107 (ntohs(init->num_inbound_streams) == 0) || 108 (ntohs(init->num_outbound_streams) == 0)) { 109 /* protocol error... send abort */ 110 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 111 sctp_send_abort(m, iphlen, src, dst, sh, init->initiate_tag, op_err, 112 mflowtype, mflowid, inp->fibnum, 113 vrf_id, port); 114 goto outnow; 115 } 116 if (sctp_validate_init_auth_params(m, offset + sizeof(*cp), 117 offset + ntohs(cp->ch.chunk_length))) { 118 /* auth parameter(s) error... send abort */ 119 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 120 "Problem with AUTH parameters"); 121 sctp_send_abort(m, iphlen, src, dst, sh, init->initiate_tag, op_err, 122 mflowtype, mflowid, inp->fibnum, 123 vrf_id, port); 124 goto outnow; 125 } 126 /* We are only accepting if we have a listening socket. */ 127 if ((stcb == NULL) && 128 ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 129 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) || 130 (!SCTP_IS_LISTENING(inp)))) { 131 /* 132 * FIX ME ?? What about TCP model and we have a 133 * match/restart case? Actually no fix is needed. the lookup 134 * will always find the existing assoc so stcb would not be 135 * NULL. It may be questionable to do this since we COULD 136 * just send back the INIT-ACK and hope that the app did 137 * accept()'s by the time the COOKIE was sent. But there is 138 * a price to pay for COOKIE generation and I don't want to 139 * pay it on the chance that the app will actually do some 140 * accepts(). The App just looses and should NOT be in this 141 * state :-) 142 */ 143 if (SCTP_BASE_SYSCTL(sctp_blackhole) == 0) { 144 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 145 "No listener"); 146 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err, 147 mflowtype, mflowid, inp->fibnum, 148 vrf_id, port); 149 } 150 goto outnow; 151 } 152 if ((stcb != NULL) && 153 (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT)) { 154 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending SHUTDOWN-ACK\n"); 155 sctp_send_shutdown_ack(stcb, NULL); 156 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 157 } else { 158 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n"); 159 sctp_send_initiate_ack(inp, stcb, net, m, iphlen, offset, 160 src, dst, sh, cp, 161 mflowtype, mflowid, 162 vrf_id, port); 163 } 164 outnow: 165 if (stcb == NULL) { 166 SCTP_INP_RUNLOCK(inp); 167 } 168 } 169 170 /* 171 * process peer "INIT/INIT-ACK" chunk returns value < 0 on error 172 */ 173 174 int 175 sctp_is_there_unsent_data(struct sctp_tcb *stcb, int so_locked) 176 { 177 int unsent_data; 178 unsigned int i; 179 struct sctp_stream_queue_pending *sp; 180 struct sctp_association *asoc; 181 182 SCTP_TCB_LOCK_ASSERT(stcb); 183 184 /* 185 * This function returns if any stream has true unsent data on it. 186 * Note that as it looks through it will clean up any places that 187 * have old data that has been sent but left at top of stream queue. 188 */ 189 asoc = &stcb->asoc; 190 unsent_data = 0; 191 if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 192 /* Check to see if some data queued */ 193 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 194 /* sa_ignore FREED_MEMORY */ 195 sp = TAILQ_FIRST(&stcb->asoc.strmout[i].outqueue); 196 if (sp == NULL) { 197 continue; 198 } 199 if ((sp->msg_is_complete) && 200 (sp->length == 0) && 201 (sp->sender_all_done)) { 202 /* 203 * We are doing differed cleanup. Last time 204 * through when we took all the data the 205 * sender_all_done was not set. 206 */ 207 if (sp->put_last_out == 0) { 208 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n"); 209 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n", 210 sp->sender_all_done, 211 sp->length, 212 sp->msg_is_complete, 213 sp->put_last_out); 214 } 215 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1); 216 TAILQ_REMOVE(&stcb->asoc.strmout[i].outqueue, sp, next); 217 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, &asoc->strmout[i], sp); 218 if (sp->net) { 219 sctp_free_remote_addr(sp->net); 220 sp->net = NULL; 221 } 222 if (sp->data) { 223 sctp_m_freem(sp->data); 224 sp->data = NULL; 225 } 226 sctp_free_a_strmoq(stcb, sp, so_locked); 227 if (!TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) { 228 unsent_data++; 229 } 230 } else { 231 unsent_data++; 232 } 233 if (unsent_data > 0) { 234 break; 235 } 236 } 237 } 238 return (unsent_data); 239 } 240 241 static int 242 sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb) 243 { 244 struct sctp_init *init; 245 struct sctp_association *asoc; 246 struct sctp_nets *lnet; 247 unsigned int i; 248 249 SCTP_TCB_LOCK_ASSERT(stcb); 250 251 init = &cp->init; 252 asoc = &stcb->asoc; 253 /* save off parameters */ 254 asoc->peer_vtag = ntohl(init->initiate_tag); 255 asoc->peers_rwnd = ntohl(init->a_rwnd); 256 /* init tsn's */ 257 asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1; 258 259 if (!TAILQ_EMPTY(&asoc->nets)) { 260 /* update any ssthresh's that may have a default */ 261 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) { 262 lnet->ssthresh = asoc->peers_rwnd; 263 if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) { 264 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION); 265 } 266 } 267 } 268 if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) { 269 unsigned int newcnt; 270 struct sctp_stream_out *outs; 271 struct sctp_stream_queue_pending *sp, *nsp; 272 struct sctp_tmit_chunk *chk, *nchk; 273 274 /* abandon the upper streams */ 275 newcnt = ntohs(init->num_inbound_streams); 276 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) { 277 if (chk->rec.data.sid >= newcnt) { 278 TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next); 279 asoc->send_queue_cnt--; 280 if (asoc->strmout[chk->rec.data.sid].chunks_on_queues > 0) { 281 asoc->strmout[chk->rec.data.sid].chunks_on_queues--; 282 #ifdef INVARIANTS 283 } else { 284 panic("No chunks on the queues for sid %u.", chk->rec.data.sid); 285 #endif 286 } 287 if (chk->data != NULL) { 288 sctp_free_bufspace(stcb, asoc, chk, 1); 289 sctp_ulp_notify(SCTP_NOTIFY_UNSENT_DG_FAIL, stcb, 290 0, chk, SCTP_SO_NOT_LOCKED); 291 if (chk->data) { 292 sctp_m_freem(chk->data); 293 chk->data = NULL; 294 } 295 } 296 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 297 /* sa_ignore FREED_MEMORY */ 298 } 299 } 300 if (asoc->strmout) { 301 for (i = newcnt; i < asoc->pre_open_streams; i++) { 302 outs = &asoc->strmout[i]; 303 TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) { 304 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1); 305 TAILQ_REMOVE(&outs->outqueue, sp, next); 306 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, outs, sp); 307 sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL, 308 stcb, 0, sp, SCTP_SO_NOT_LOCKED); 309 if (sp->data) { 310 sctp_m_freem(sp->data); 311 sp->data = NULL; 312 } 313 if (sp->net) { 314 sctp_free_remote_addr(sp->net); 315 sp->net = NULL; 316 } 317 /* Free the chunk */ 318 sctp_free_a_strmoq(stcb, sp, SCTP_SO_NOT_LOCKED); 319 /* sa_ignore FREED_MEMORY */ 320 } 321 outs->state = SCTP_STREAM_CLOSED; 322 } 323 } 324 /* cut back the count */ 325 asoc->pre_open_streams = newcnt; 326 } 327 asoc->streamoutcnt = asoc->pre_open_streams; 328 if (asoc->strmout) { 329 for (i = 0; i < asoc->streamoutcnt; i++) { 330 asoc->strmout[i].state = SCTP_STREAM_OPEN; 331 } 332 } 333 /* EY - nr_sack: initialize highest tsn in nr_mapping_array */ 334 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 335 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 336 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 337 } 338 /* This is the next one we expect */ 339 asoc->str_reset_seq_in = asoc->asconf_seq_in + 1; 340 341 asoc->mapping_array_base_tsn = ntohl(init->initial_tsn); 342 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in; 343 344 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 345 /* open the requested streams */ 346 347 if (asoc->strmin != NULL) { 348 /* Free the old ones */ 349 for (i = 0; i < asoc->streamincnt; i++) { 350 sctp_clean_up_stream(stcb, &asoc->strmin[i].inqueue); 351 sctp_clean_up_stream(stcb, &asoc->strmin[i].uno_inqueue); 352 } 353 SCTP_FREE(asoc->strmin, SCTP_M_STRMI); 354 } 355 if (asoc->max_inbound_streams > ntohs(init->num_outbound_streams)) { 356 asoc->streamincnt = ntohs(init->num_outbound_streams); 357 } else { 358 asoc->streamincnt = asoc->max_inbound_streams; 359 } 360 SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt * 361 sizeof(struct sctp_stream_in), SCTP_M_STRMI); 362 if (asoc->strmin == NULL) { 363 /* we didn't get memory for the streams! */ 364 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n"); 365 return (-1); 366 } 367 for (i = 0; i < asoc->streamincnt; i++) { 368 asoc->strmin[i].sid = i; 369 asoc->strmin[i].last_mid_delivered = 0xffffffff; 370 TAILQ_INIT(&asoc->strmin[i].inqueue); 371 TAILQ_INIT(&asoc->strmin[i].uno_inqueue); 372 asoc->strmin[i].pd_api_started = 0; 373 asoc->strmin[i].delivery_started = 0; 374 } 375 /* 376 * load_address_from_init will put the addresses into the 377 * association when the COOKIE is processed or the INIT-ACK is 378 * processed. Both types of COOKIE's existing and new call this 379 * routine. It will remove addresses that are no longer in the 380 * association (for the restarting case where addresses are 381 * removed). Up front when the INIT arrives we will discard it if it 382 * is a restart and new addresses have been added. 383 */ 384 /* sa_ignore MEMLEAK */ 385 return (0); 386 } 387 388 /* 389 * INIT-ACK message processing/consumption returns value < 0 on error 390 */ 391 static int 392 sctp_process_init_ack(struct mbuf *m, int iphlen, int offset, 393 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 394 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 395 struct sctp_nets *net, int *abort_no_unlock, 396 uint8_t mflowtype, uint32_t mflowid, 397 uint32_t vrf_id) 398 { 399 struct sctp_association *asoc; 400 struct mbuf *op_err; 401 int retval, abort_flag, cookie_found; 402 int initack_limit; 403 int nat_friendly = 0; 404 405 /* First verify that we have no illegal param's */ 406 abort_flag = 0; 407 cookie_found = 0; 408 409 op_err = sctp_arethere_unrecognized_parameters(m, 410 (offset + sizeof(struct sctp_init_chunk)), 411 &abort_flag, (struct sctp_chunkhdr *)cp, 412 &nat_friendly, &cookie_found); 413 if (abort_flag) { 414 /* Send an abort and notify peer */ 415 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 416 src, dst, sh, op_err, 417 mflowtype, mflowid, 418 vrf_id, net->port); 419 *abort_no_unlock = 1; 420 return (-1); 421 } 422 if (!cookie_found) { 423 uint16_t len; 424 425 /* Only report the missing cookie parameter */ 426 if (op_err != NULL) { 427 sctp_m_freem(op_err); 428 } 429 len = (uint16_t)(sizeof(struct sctp_error_missing_param) + sizeof(uint16_t)); 430 /* We abort with an error of missing mandatory param */ 431 op_err = sctp_get_mbuf_for_msg(len, 0, M_NOWAIT, 1, MT_DATA); 432 if (op_err != NULL) { 433 struct sctp_error_missing_param *cause; 434 435 SCTP_BUF_LEN(op_err) = len; 436 cause = mtod(op_err, struct sctp_error_missing_param *); 437 /* Subtract the reserved param */ 438 cause->cause.code = htons(SCTP_CAUSE_MISSING_PARAM); 439 cause->cause.length = htons(len); 440 cause->num_missing_params = htonl(1); 441 cause->type[0] = htons(SCTP_STATE_COOKIE); 442 } 443 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 444 src, dst, sh, op_err, 445 mflowtype, mflowid, 446 vrf_id, net->port); 447 *abort_no_unlock = 1; 448 return (-3); 449 } 450 asoc = &stcb->asoc; 451 asoc->peer_supports_nat = (uint8_t)nat_friendly; 452 /* process the peer's parameters in the INIT-ACK */ 453 if (sctp_process_init((struct sctp_init_chunk *)cp, stcb) < 0) { 454 if (op_err != NULL) { 455 sctp_m_freem(op_err); 456 } 457 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 458 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_init() failed\n"); 459 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 460 src, dst, sh, op_err, 461 mflowtype, mflowid, 462 vrf_id, net->port); 463 *abort_no_unlock = 1; 464 return (-1); 465 } 466 initack_limit = offset + ntohs(cp->ch.chunk_length); 467 /* load all addresses */ 468 if ((retval = sctp_load_addresses_from_init(stcb, m, 469 offset + sizeof(struct sctp_init_chunk), 470 initack_limit, src, dst, NULL, stcb->asoc.port)) < 0) { 471 if (op_err != NULL) { 472 sctp_m_freem(op_err); 473 } 474 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 475 "Problem with address parameters"); 476 SCTPDBG(SCTP_DEBUG_INPUT1, 477 "Load addresses from INIT causes an abort %d\n", 478 retval); 479 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 480 src, dst, sh, op_err, 481 mflowtype, mflowid, 482 vrf_id, net->port); 483 *abort_no_unlock = 1; 484 return (-1); 485 } 486 /* if the peer doesn't support asconf, flush the asconf queue */ 487 if (asoc->asconf_supported == 0) { 488 struct sctp_asconf_addr *param, *nparam; 489 490 TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) { 491 TAILQ_REMOVE(&asoc->asconf_queue, param, next); 492 SCTP_FREE(param, SCTP_M_ASC_ADDR); 493 } 494 } 495 496 stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs, 497 stcb->asoc.local_hmacs); 498 if (op_err) { 499 sctp_queue_op_err(stcb, op_err); 500 /* queuing will steal away the mbuf chain to the out queue */ 501 op_err = NULL; 502 } 503 /* extract the cookie and queue it to "echo" it back... */ 504 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 505 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 506 stcb->asoc.overall_error_count, 507 0, 508 SCTP_FROM_SCTP_INPUT, 509 __LINE__); 510 } 511 512 /* 513 * Cancel the INIT timer, We do this first before queueing the 514 * cookie. We always cancel at the primary to assume that we are 515 * canceling the timer started by the INIT which always goes to the 516 * primary. 517 */ 518 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb, 519 asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3); 520 521 /* calculate the RTO */ 522 if (asoc->overall_error_count == 0) { 523 sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, 524 SCTP_RTT_FROM_NON_DATA); 525 } 526 stcb->asoc.overall_error_count = 0; 527 net->error_count = 0; 528 retval = sctp_send_cookie_echo(m, offset, initack_limit, stcb, net); 529 return (retval); 530 } 531 532 static void 533 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp, 534 struct sctp_tcb *stcb, struct sctp_nets *net) 535 { 536 union sctp_sockstore store; 537 struct sctp_nets *r_net, *f_net; 538 struct timeval tv; 539 int req_prim = 0; 540 uint16_t old_error_counter; 541 542 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) { 543 /* Invalid length */ 544 return; 545 } 546 547 memset(&store, 0, sizeof(store)); 548 switch (cp->heartbeat.hb_info.addr_family) { 549 #ifdef INET 550 case AF_INET: 551 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) { 552 store.sin.sin_family = cp->heartbeat.hb_info.addr_family; 553 store.sin.sin_len = cp->heartbeat.hb_info.addr_len; 554 store.sin.sin_port = stcb->rport; 555 memcpy(&store.sin.sin_addr, cp->heartbeat.hb_info.address, 556 sizeof(store.sin.sin_addr)); 557 } else { 558 return; 559 } 560 break; 561 #endif 562 #ifdef INET6 563 case AF_INET6: 564 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) { 565 store.sin6.sin6_family = cp->heartbeat.hb_info.addr_family; 566 store.sin6.sin6_len = cp->heartbeat.hb_info.addr_len; 567 store.sin6.sin6_port = stcb->rport; 568 memcpy(&store.sin6.sin6_addr, cp->heartbeat.hb_info.address, sizeof(struct in6_addr)); 569 } else { 570 return; 571 } 572 break; 573 #endif 574 default: 575 return; 576 } 577 r_net = sctp_findnet(stcb, &store.sa); 578 if (r_net == NULL) { 579 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n"); 580 return; 581 } 582 if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) && 583 (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) && 584 (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) { 585 /* 586 * If the its a HB and it's random value is correct when can 587 * confirm the destination. 588 */ 589 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 590 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) { 591 stcb->asoc.primary_destination = r_net; 592 r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY; 593 f_net = TAILQ_FIRST(&stcb->asoc.nets); 594 if (f_net != r_net) { 595 /* 596 * first one on the list is NOT the primary 597 * sctp_cmpaddr() is much more efficient if 598 * the primary is the first on the list, 599 * make it so. 600 */ 601 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next); 602 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next); 603 } 604 req_prim = 1; 605 } 606 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 607 stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 608 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, 609 r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4); 610 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 611 } 612 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 613 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 614 stcb->asoc.overall_error_count, 615 0, 616 SCTP_FROM_SCTP_INPUT, 617 __LINE__); 618 } 619 stcb->asoc.overall_error_count = 0; 620 old_error_counter = r_net->error_count; 621 r_net->error_count = 0; 622 r_net->hb_responded = 1; 623 tv.tv_sec = cp->heartbeat.hb_info.time_value_1; 624 tv.tv_usec = cp->heartbeat.hb_info.time_value_2; 625 /* Now lets do a RTO with this */ 626 sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, 627 SCTP_RTT_FROM_NON_DATA); 628 if ((r_net->dest_state & SCTP_ADDR_REACHABLE) == 0) { 629 r_net->dest_state |= SCTP_ADDR_REACHABLE; 630 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb, 631 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 632 } 633 if (r_net->dest_state & SCTP_ADDR_PF) { 634 r_net->dest_state &= ~SCTP_ADDR_PF; 635 stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net); 636 } 637 if (old_error_counter > 0) { 638 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 639 stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_5); 640 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 641 } 642 if (r_net == stcb->asoc.primary_destination) { 643 if (stcb->asoc.alternate) { 644 /* release the alternate, primary is good */ 645 sctp_free_remote_addr(stcb->asoc.alternate); 646 stcb->asoc.alternate = NULL; 647 } 648 } 649 /* Mobility adaptation */ 650 if (req_prim) { 651 if ((sctp_is_mobility_feature_on(stcb->sctp_ep, 652 SCTP_MOBILITY_BASE) || 653 sctp_is_mobility_feature_on(stcb->sctp_ep, 654 SCTP_MOBILITY_FASTHANDOFF)) && 655 sctp_is_mobility_feature_on(stcb->sctp_ep, 656 SCTP_MOBILITY_PRIM_DELETED)) { 657 sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED, 658 stcb->sctp_ep, stcb, NULL, 659 SCTP_FROM_SCTP_INPUT + SCTP_LOC_6); 660 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 661 SCTP_MOBILITY_FASTHANDOFF)) { 662 sctp_assoc_immediate_retrans(stcb, 663 stcb->asoc.primary_destination); 664 } 665 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 666 SCTP_MOBILITY_BASE)) { 667 sctp_move_chunks_from_net(stcb, 668 stcb->asoc.deleted_primary); 669 } 670 sctp_delete_prim_timer(stcb->sctp_ep, stcb); 671 } 672 } 673 } 674 675 static int 676 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb) 677 { 678 /* 679 * Return 0 means we want you to proceed with the abort non-zero 680 * means no abort processing. 681 */ 682 uint32_t new_vtag; 683 struct sctpasochead *head; 684 685 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || 686 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 687 atomic_add_int(&stcb->asoc.refcnt, 1); 688 SCTP_TCB_UNLOCK(stcb); 689 SCTP_INP_INFO_WLOCK(); 690 SCTP_TCB_LOCK(stcb); 691 atomic_subtract_int(&stcb->asoc.refcnt, 1); 692 } else { 693 return (0); 694 } 695 new_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 696 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) { 697 /* generate a new vtag and send init */ 698 LIST_REMOVE(stcb, sctp_asocs); 699 stcb->asoc.my_vtag = new_vtag; 700 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 701 /* 702 * put it in the bucket in the vtag hash of assoc's for the 703 * system 704 */ 705 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 706 SCTP_INP_INFO_WUNLOCK(); 707 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 708 return (1); 709 } else { 710 /* 711 * treat like a case where the cookie expired i.e.: - dump 712 * current cookie. - generate a new vtag. - resend init. 713 */ 714 /* generate a new vtag and send init */ 715 LIST_REMOVE(stcb, sctp_asocs); 716 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT); 717 sctp_stop_all_cookie_timers(stcb); 718 sctp_toss_old_cookies(stcb, &stcb->asoc); 719 stcb->asoc.my_vtag = new_vtag; 720 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 721 /* 722 * put it in the bucket in the vtag hash of assoc's for the 723 * system 724 */ 725 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 726 SCTP_INP_INFO_WUNLOCK(); 727 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 728 return (1); 729 } 730 return (0); 731 } 732 733 static int 734 sctp_handle_nat_missing_state(struct sctp_tcb *stcb, 735 struct sctp_nets *net) 736 { 737 /* 738 * return 0 means we want you to proceed with the abort non-zero 739 * means no abort processing 740 */ 741 if (stcb->asoc.auth_supported == 0) { 742 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n"); 743 return (0); 744 } 745 sctp_asconf_send_nat_state_update(stcb, net); 746 return (1); 747 } 748 749 /* Returns 1 if the stcb was aborted, 0 otherwise */ 750 static int 751 sctp_handle_abort(struct sctp_abort_chunk *abort, 752 struct sctp_tcb *stcb, struct sctp_nets *net) 753 { 754 uint16_t len; 755 uint16_t error; 756 757 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n"); 758 if (stcb == NULL) 759 return (0); 760 761 len = ntohs(abort->ch.chunk_length); 762 if (len >= sizeof(struct sctp_chunkhdr) + sizeof(struct sctp_error_cause)) { 763 /* 764 * Need to check the cause codes for our two magic nat 765 * aborts which don't kill the assoc necessarily. 766 */ 767 struct sctp_error_cause *cause; 768 769 cause = (struct sctp_error_cause *)(abort + 1); 770 error = ntohs(cause->code); 771 if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) { 772 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state, ABORT flags:%x\n", 773 abort->ch.chunk_flags); 774 if (sctp_handle_nat_colliding_state(stcb)) { 775 return (0); 776 } 777 } else if (error == SCTP_CAUSE_NAT_MISSING_STATE) { 778 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state, ABORT flags:%x\n", 779 abort->ch.chunk_flags); 780 if (sctp_handle_nat_missing_state(stcb, net)) { 781 return (0); 782 } 783 } 784 } else { 785 error = 0; 786 } 787 /* stop any receive timers */ 788 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, NULL, 789 SCTP_FROM_SCTP_INPUT + SCTP_LOC_7); 790 /* notify user of the abort and clean up... */ 791 sctp_abort_notification(stcb, true, false, error, abort, SCTP_SO_NOT_LOCKED); 792 /* free the tcb */ 793 SCTP_STAT_INCR_COUNTER32(sctps_aborted); 794 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) || 795 (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 796 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 797 } 798 #ifdef SCTP_ASOCLOG_OF_TSNS 799 sctp_print_out_track_log(stcb); 800 #endif 801 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 802 SCTP_FROM_SCTP_INPUT + SCTP_LOC_8); 803 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n"); 804 return (1); 805 } 806 807 static void 808 sctp_start_net_timers(struct sctp_tcb *stcb) 809 { 810 uint32_t cnt_hb_sent; 811 struct sctp_nets *net; 812 813 cnt_hb_sent = 0; 814 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 815 /* 816 * For each network start: 1) A pmtu timer. 2) A HB timer 3) 817 * If the dest in unconfirmed send a hb as well if under 818 * max_hb_burst have been sent. 819 */ 820 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net); 821 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net); 822 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) && 823 (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) { 824 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 825 cnt_hb_sent++; 826 } 827 } 828 if (cnt_hb_sent) { 829 sctp_chunk_output(stcb->sctp_ep, stcb, 830 SCTP_OUTPUT_FROM_COOKIE_ACK, 831 SCTP_SO_NOT_LOCKED); 832 } 833 } 834 835 static void 836 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp, 837 struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag) 838 { 839 struct sctp_association *asoc; 840 int some_on_streamwheel; 841 int old_state; 842 843 SCTPDBG(SCTP_DEBUG_INPUT2, 844 "sctp_handle_shutdown: handling SHUTDOWN\n"); 845 if (stcb == NULL) 846 return; 847 asoc = &stcb->asoc; 848 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || 849 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 850 return; 851 } 852 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) { 853 /* Shutdown NOT the expected size */ 854 return; 855 } 856 old_state = SCTP_GET_STATE(stcb); 857 sctp_update_acked(stcb, cp, abort_flag); 858 if (*abort_flag) { 859 return; 860 } 861 if (asoc->control_pdapi) { 862 /* 863 * With a normal shutdown we assume the end of last record. 864 */ 865 SCTP_INP_READ_LOCK(stcb->sctp_ep); 866 if (asoc->control_pdapi->on_strm_q) { 867 struct sctp_stream_in *strm; 868 869 strm = &asoc->strmin[asoc->control_pdapi->sinfo_stream]; 870 if (asoc->control_pdapi->on_strm_q == SCTP_ON_UNORDERED) { 871 /* Unordered */ 872 TAILQ_REMOVE(&strm->uno_inqueue, asoc->control_pdapi, next_instrm); 873 asoc->control_pdapi->on_strm_q = 0; 874 } else if (asoc->control_pdapi->on_strm_q == SCTP_ON_ORDERED) { 875 /* Ordered */ 876 TAILQ_REMOVE(&strm->inqueue, asoc->control_pdapi, next_instrm); 877 asoc->control_pdapi->on_strm_q = 0; 878 #ifdef INVARIANTS 879 } else { 880 panic("Unknown state on ctrl:%p on_strm_q:%d", 881 asoc->control_pdapi, 882 asoc->control_pdapi->on_strm_q); 883 #endif 884 } 885 } 886 asoc->control_pdapi->end_added = 1; 887 asoc->control_pdapi->pdapi_aborted = 1; 888 asoc->control_pdapi = NULL; 889 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 890 if (stcb->sctp_socket) { 891 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 892 } 893 } 894 /* goto SHUTDOWN_RECEIVED state to block new requests */ 895 if (stcb->sctp_socket) { 896 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) && 897 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) && 898 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT)) { 899 SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_RECEIVED); 900 /* 901 * notify upper layer that peer has initiated a 902 * shutdown 903 */ 904 sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 905 906 /* reset time */ 907 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 908 } 909 } 910 if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) { 911 /* 912 * stop the shutdown timer, since we WILL move to 913 * SHUTDOWN-ACK-SENT. 914 */ 915 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, 916 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9); 917 } 918 /* Now is there unsent data on a stream somewhere? */ 919 some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED); 920 921 if (!TAILQ_EMPTY(&asoc->send_queue) || 922 !TAILQ_EMPTY(&asoc->sent_queue) || 923 some_on_streamwheel) { 924 /* By returning we will push more data out */ 925 return; 926 } else { 927 /* no outstanding data to send, so move on... */ 928 /* send SHUTDOWN-ACK */ 929 /* move to SHUTDOWN-ACK-SENT state */ 930 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) || 931 (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 932 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 933 } 934 if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 935 SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_ACK_SENT); 936 sctp_stop_timers_for_shutdown(stcb); 937 sctp_send_shutdown_ack(stcb, net); 938 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, 939 stcb->sctp_ep, stcb, net); 940 } else if (old_state == SCTP_STATE_SHUTDOWN_ACK_SENT) { 941 sctp_send_shutdown_ack(stcb, net); 942 } 943 } 944 } 945 946 static void 947 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED, 948 struct sctp_tcb *stcb, 949 struct sctp_nets *net) 950 { 951 struct sctp_association *asoc; 952 953 SCTPDBG(SCTP_DEBUG_INPUT2, 954 "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n"); 955 if (stcb == NULL) 956 return; 957 958 asoc = &stcb->asoc; 959 /* process according to association state */ 960 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || 961 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 962 /* unexpected SHUTDOWN-ACK... do OOTB handling... */ 963 sctp_send_shutdown_complete(stcb, net, 1); 964 SCTP_TCB_UNLOCK(stcb); 965 return; 966 } 967 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) && 968 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) { 969 /* unexpected SHUTDOWN-ACK... so ignore... */ 970 SCTP_TCB_UNLOCK(stcb); 971 return; 972 } 973 if (asoc->control_pdapi) { 974 /* 975 * With a normal shutdown we assume the end of last record. 976 */ 977 SCTP_INP_READ_LOCK(stcb->sctp_ep); 978 asoc->control_pdapi->end_added = 1; 979 asoc->control_pdapi->pdapi_aborted = 1; 980 asoc->control_pdapi = NULL; 981 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 982 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 983 } 984 #ifdef INVARIANTS 985 if (!TAILQ_EMPTY(&asoc->send_queue) || 986 !TAILQ_EMPTY(&asoc->sent_queue) || 987 sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) { 988 panic("Queues are not empty when handling SHUTDOWN-ACK"); 989 } 990 #endif 991 /* stop the timer */ 992 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, 993 SCTP_FROM_SCTP_INPUT + SCTP_LOC_10); 994 /* send SHUTDOWN-COMPLETE */ 995 sctp_send_shutdown_complete(stcb, net, 0); 996 /* notify upper layer protocol */ 997 if (stcb->sctp_socket) { 998 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 999 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 1000 SCTP_SB_CLEAR(stcb->sctp_socket->so_snd); 1001 } 1002 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 1003 } 1004 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 1005 /* free the TCB but first save off the ep */ 1006 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1007 SCTP_FROM_SCTP_INPUT + SCTP_LOC_11); 1008 } 1009 1010 static void 1011 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, uint8_t chunk_type) 1012 { 1013 switch (chunk_type) { 1014 case SCTP_ASCONF_ACK: 1015 case SCTP_ASCONF: 1016 sctp_asconf_cleanup(stcb); 1017 break; 1018 case SCTP_IFORWARD_CUM_TSN: 1019 case SCTP_FORWARD_CUM_TSN: 1020 stcb->asoc.prsctp_supported = 0; 1021 break; 1022 default: 1023 SCTPDBG(SCTP_DEBUG_INPUT2, 1024 "Peer does not support chunk type %d (0x%x).\n", 1025 chunk_type, chunk_type); 1026 break; 1027 } 1028 } 1029 1030 /* 1031 * Skip past the param header and then we will find the param that caused the 1032 * problem. There are a number of param's in a ASCONF OR the prsctp param 1033 * these will turn of specific features. 1034 * XXX: Is this the right thing to do? 1035 */ 1036 static void 1037 sctp_process_unrecog_param(struct sctp_tcb *stcb, uint16_t parameter_type) 1038 { 1039 switch (parameter_type) { 1040 /* pr-sctp draft */ 1041 case SCTP_PRSCTP_SUPPORTED: 1042 stcb->asoc.prsctp_supported = 0; 1043 break; 1044 case SCTP_SUPPORTED_CHUNK_EXT: 1045 break; 1046 /* draft-ietf-tsvwg-addip-sctp */ 1047 case SCTP_HAS_NAT_SUPPORT: 1048 stcb->asoc.peer_supports_nat = 0; 1049 break; 1050 case SCTP_ADD_IP_ADDRESS: 1051 case SCTP_DEL_IP_ADDRESS: 1052 case SCTP_SET_PRIM_ADDR: 1053 stcb->asoc.asconf_supported = 0; 1054 break; 1055 case SCTP_SUCCESS_REPORT: 1056 case SCTP_ERROR_CAUSE_IND: 1057 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n"); 1058 SCTPDBG(SCTP_DEBUG_INPUT2, 1059 "Turning off ASCONF to this strange peer\n"); 1060 stcb->asoc.asconf_supported = 0; 1061 break; 1062 default: 1063 SCTPDBG(SCTP_DEBUG_INPUT2, 1064 "Peer does not support param type %d (0x%x)??\n", 1065 parameter_type, parameter_type); 1066 break; 1067 } 1068 } 1069 1070 static int 1071 sctp_handle_error(struct sctp_chunkhdr *ch, 1072 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 1073 { 1074 struct sctp_error_cause *cause; 1075 struct sctp_association *asoc; 1076 uint32_t remaining_length, adjust; 1077 uint16_t code, cause_code, cause_length; 1078 1079 /* parse through all of the errors and process */ 1080 asoc = &stcb->asoc; 1081 cause = (struct sctp_error_cause *)((caddr_t)ch + 1082 sizeof(struct sctp_chunkhdr)); 1083 remaining_length = ntohs(ch->chunk_length); 1084 if (remaining_length > limit) { 1085 remaining_length = limit; 1086 } 1087 if (remaining_length >= sizeof(struct sctp_chunkhdr)) { 1088 remaining_length -= sizeof(struct sctp_chunkhdr); 1089 } else { 1090 remaining_length = 0; 1091 } 1092 code = 0; 1093 while (remaining_length >= sizeof(struct sctp_error_cause)) { 1094 /* Process an Error Cause */ 1095 cause_code = ntohs(cause->code); 1096 cause_length = ntohs(cause->length); 1097 if ((cause_length > remaining_length) || (cause_length == 0)) { 1098 /* Invalid cause length, possibly due to truncation. */ 1099 SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in cause - bytes left: %u cause length: %u\n", 1100 remaining_length, cause_length); 1101 return (0); 1102 } 1103 if (code == 0) { 1104 /* report the first error cause */ 1105 code = cause_code; 1106 } 1107 switch (cause_code) { 1108 case SCTP_CAUSE_INVALID_STREAM: 1109 case SCTP_CAUSE_MISSING_PARAM: 1110 case SCTP_CAUSE_INVALID_PARAM: 1111 case SCTP_CAUSE_NO_USER_DATA: 1112 SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %u back? We have a bug :/ (or do they?)\n", 1113 cause_code); 1114 break; 1115 case SCTP_CAUSE_NAT_COLLIDING_STATE: 1116 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state, ERROR flags: %x\n", 1117 ch->chunk_flags); 1118 if (sctp_handle_nat_colliding_state(stcb)) { 1119 return (0); 1120 } 1121 break; 1122 case SCTP_CAUSE_NAT_MISSING_STATE: 1123 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state, ERROR flags: %x\n", 1124 ch->chunk_flags); 1125 if (sctp_handle_nat_missing_state(stcb, net)) { 1126 return (0); 1127 } 1128 break; 1129 case SCTP_CAUSE_STALE_COOKIE: 1130 /* 1131 * We only act if we have echoed a cookie and are 1132 * waiting. 1133 */ 1134 if ((cause_length >= sizeof(struct sctp_error_stale_cookie)) && 1135 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 1136 struct timeval now; 1137 struct sctp_error_stale_cookie *stale_cookie; 1138 uint64_t stale_time; 1139 1140 asoc->stale_cookie_count++; 1141 if (asoc->stale_cookie_count > asoc->max_init_times) { 1142 sctp_abort_notification(stcb, false, true, 0, NULL, SCTP_SO_NOT_LOCKED); 1143 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1144 SCTP_FROM_SCTP_INPUT + SCTP_LOC_12); 1145 return (-1); 1146 } 1147 stale_cookie = (struct sctp_error_stale_cookie *)cause; 1148 stale_time = ntohl(stale_cookie->stale_time); 1149 if (stale_time == 0) { 1150 /* Use an RTT as an approximation. */ 1151 (void)SCTP_GETTIME_TIMEVAL(&now); 1152 timevalsub(&now, &asoc->time_entered); 1153 stale_time = (uint64_t)1000000 * (uint64_t)now.tv_sec + (uint64_t)now.tv_usec; 1154 if (stale_time == 0) { 1155 stale_time = 1; 1156 } 1157 } 1158 /* 1159 * stale_time is in usec, convert it to 1160 * msec. Round upwards, to ensure that it is 1161 * non-zero. 1162 */ 1163 stale_time = (stale_time + 999) / 1000; 1164 /* Double it, to be more robust on RTX. */ 1165 stale_time = 2 * stale_time; 1166 asoc->cookie_preserve_req = (uint32_t)stale_time; 1167 if (asoc->overall_error_count == 0) { 1168 sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, 1169 SCTP_RTT_FROM_NON_DATA); 1170 } 1171 asoc->overall_error_count = 0; 1172 /* Blast back to INIT state */ 1173 sctp_toss_old_cookies(stcb, &stcb->asoc); 1174 sctp_stop_all_cookie_timers(stcb); 1175 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT); 1176 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 1177 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 1178 } 1179 break; 1180 case SCTP_CAUSE_UNRESOLVABLE_ADDR: 1181 /* 1182 * Nothing we can do here, we don't do hostname 1183 * addresses so if the peer does not like my IPv6 1184 * (or IPv4 for that matter) it does not matter. If 1185 * they don't support that type of address, they can 1186 * NOT possibly get that packet type... i.e. with no 1187 * IPv6 you can't receive a IPv6 packet. so we can 1188 * safely ignore this one. If we ever added support 1189 * for HOSTNAME Addresses, then we would need to do 1190 * something here. 1191 */ 1192 break; 1193 case SCTP_CAUSE_UNRECOG_CHUNK: 1194 if (cause_length >= sizeof(struct sctp_error_unrecognized_chunk)) { 1195 struct sctp_error_unrecognized_chunk *unrec_chunk; 1196 1197 unrec_chunk = (struct sctp_error_unrecognized_chunk *)cause; 1198 sctp_process_unrecog_chunk(stcb, unrec_chunk->ch.chunk_type); 1199 } 1200 break; 1201 case SCTP_CAUSE_UNRECOG_PARAM: 1202 /* XXX: We only consider the first parameter */ 1203 if (cause_length >= sizeof(struct sctp_error_cause) + sizeof(struct sctp_paramhdr)) { 1204 struct sctp_paramhdr *unrec_parameter; 1205 1206 unrec_parameter = (struct sctp_paramhdr *)(cause + 1); 1207 sctp_process_unrecog_param(stcb, ntohs(unrec_parameter->param_type)); 1208 } 1209 break; 1210 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN: 1211 /* 1212 * We ignore this since the timer will drive out a 1213 * new cookie anyway and there timer will drive us 1214 * to send a SHUTDOWN_COMPLETE. We can't send one 1215 * here since we don't have their tag. 1216 */ 1217 break; 1218 case SCTP_CAUSE_DELETING_LAST_ADDR: 1219 case SCTP_CAUSE_RESOURCE_SHORTAGE: 1220 case SCTP_CAUSE_DELETING_SRC_ADDR: 1221 /* 1222 * We should NOT get these here, but in a 1223 * ASCONF-ACK. 1224 */ 1225 SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a error cause with code %u.\n", 1226 cause_code); 1227 break; 1228 case SCTP_CAUSE_OUT_OF_RESC: 1229 /* 1230 * And what, pray tell do we do with the fact that 1231 * the peer is out of resources? Not really sure we 1232 * could do anything but abort. I suspect this 1233 * should have came WITH an abort instead of in a 1234 * OP-ERROR. 1235 */ 1236 break; 1237 default: 1238 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown code 0x%x\n", 1239 cause_code); 1240 break; 1241 } 1242 adjust = SCTP_SIZE32(cause_length); 1243 if (remaining_length >= adjust) { 1244 remaining_length -= adjust; 1245 } else { 1246 remaining_length = 0; 1247 } 1248 cause = (struct sctp_error_cause *)((caddr_t)cause + adjust); 1249 } 1250 sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, code, ch, SCTP_SO_NOT_LOCKED); 1251 return (0); 1252 } 1253 1254 static int 1255 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset, 1256 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 1257 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 1258 struct sctp_nets *net, int *abort_no_unlock, 1259 uint8_t mflowtype, uint32_t mflowid, 1260 uint32_t vrf_id) 1261 { 1262 struct sctp_init_ack *init_ack; 1263 struct mbuf *op_err; 1264 1265 SCTPDBG(SCTP_DEBUG_INPUT2, 1266 "sctp_handle_init_ack: handling INIT-ACK\n"); 1267 1268 if (stcb == NULL) { 1269 SCTPDBG(SCTP_DEBUG_INPUT2, 1270 "sctp_handle_init_ack: TCB is null\n"); 1271 return (-1); 1272 } 1273 /* Only process the INIT-ACK chunk in COOKIE WAIT state. */ 1274 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) { 1275 init_ack = &cp->init; 1276 /* Validate parameters. */ 1277 if ((ntohl(init_ack->initiate_tag) == 0) || 1278 (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) || 1279 (ntohs(init_ack->num_inbound_streams) == 0) || 1280 (ntohs(init_ack->num_outbound_streams) == 0)) { 1281 /* One of the mandatory parameters is illegal. */ 1282 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1283 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1284 src, dst, sh, op_err, 1285 mflowtype, mflowid, 1286 vrf_id, net->port); 1287 *abort_no_unlock = 1; 1288 return (-1); 1289 } 1290 if (stcb->asoc.primary_destination->dest_state & 1291 SCTP_ADDR_UNCONFIRMED) { 1292 /* 1293 * The primary is where we sent the INIT, we can 1294 * always consider it confirmed when the INIT-ACK is 1295 * returned. Do this before we load addresses 1296 * though. 1297 */ 1298 stcb->asoc.primary_destination->dest_state &= 1299 ~SCTP_ADDR_UNCONFIRMED; 1300 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 1301 stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED); 1302 } 1303 if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb, 1304 net, abort_no_unlock, 1305 mflowtype, mflowid, 1306 vrf_id) < 0) { 1307 /* error in parsing parameters */ 1308 return (-1); 1309 } 1310 /* Update our state. */ 1311 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n"); 1312 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_ECHOED); 1313 1314 /* Reset the RTO calculation. */ 1315 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 1316 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 1317 stcb->asoc.overall_error_count, 1318 0, 1319 SCTP_FROM_SCTP_INPUT, 1320 __LINE__); 1321 } 1322 stcb->asoc.overall_error_count = 0; 1323 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 1324 /* 1325 * Collapse the init timer back in case of a exponential 1326 * backoff. 1327 */ 1328 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep, 1329 stcb, net); 1330 /* 1331 * The output routine at the end of the inbound data 1332 * processing will cause the cookie to be sent. 1333 */ 1334 SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n"); 1335 return (0); 1336 } else { 1337 return (-1); 1338 } 1339 } 1340 1341 static struct sctp_tcb * 1342 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1343 struct sockaddr *src, struct sockaddr *dst, 1344 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1345 struct sctp_inpcb *inp, struct sctp_nets **netp, 1346 struct sockaddr *init_src, int *notification, 1347 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1348 uint8_t mflowtype, uint32_t mflowid, 1349 uint32_t vrf_id, uint16_t port); 1350 1351 /* 1352 * handle a state cookie for an existing association m: input packet mbuf 1353 * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a 1354 * "split" mbuf and the cookie signature does not exist offset: offset into 1355 * mbuf to the cookie-echo chunk 1356 */ 1357 static struct sctp_tcb * 1358 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset, 1359 struct sockaddr *src, struct sockaddr *dst, 1360 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1361 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp, 1362 struct sockaddr *init_src, int *notification, 1363 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1364 uint8_t mflowtype, uint32_t mflowid, 1365 uint32_t vrf_id, uint16_t port) 1366 { 1367 struct sctp_association *asoc; 1368 struct sctp_init_chunk *init_cp, init_buf; 1369 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1370 struct sctp_asconf_addr *aparam, *naparam; 1371 struct sctp_asconf_ack *aack, *naack; 1372 struct sctp_tmit_chunk *chk, *nchk; 1373 struct sctp_stream_reset_list *strrst, *nstrrst; 1374 struct sctp_queued_to_read *sq, *nsq; 1375 struct sctp_nets *net; 1376 struct mbuf *op_err; 1377 int init_offset, initack_offset, i; 1378 int retval; 1379 int spec_flag = 0; 1380 uint32_t how_indx; 1381 #if defined(SCTP_DETAILED_STR_STATS) 1382 int j; 1383 #endif 1384 1385 net = *netp; 1386 /* I know that the TCB is non-NULL from the caller */ 1387 asoc = &stcb->asoc; 1388 for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) { 1389 if (asoc->cookie_how[how_indx] == 0) 1390 break; 1391 } 1392 if (how_indx < sizeof(asoc->cookie_how)) { 1393 asoc->cookie_how[how_indx] = 1; 1394 } 1395 if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 1396 /* SHUTDOWN came in after sending INIT-ACK */ 1397 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination); 1398 op_err = sctp_generate_cause(SCTP_CAUSE_COOKIE_IN_SHUTDOWN, ""); 1399 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 1400 mflowtype, mflowid, inp->fibnum, 1401 vrf_id, net->port); 1402 if (how_indx < sizeof(asoc->cookie_how)) 1403 asoc->cookie_how[how_indx] = 2; 1404 SCTP_TCB_UNLOCK(stcb); 1405 return (NULL); 1406 } 1407 /* 1408 * find and validate the INIT chunk in the cookie (peer's info) the 1409 * INIT should start after the cookie-echo header struct (chunk 1410 * header, state cookie header struct) 1411 */ 1412 init_offset = offset += sizeof(struct sctp_cookie_echo_chunk); 1413 1414 init_cp = (struct sctp_init_chunk *) 1415 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 1416 (uint8_t *)&init_buf); 1417 if (init_cp == NULL) { 1418 /* could not pull a INIT chunk in cookie */ 1419 SCTP_TCB_UNLOCK(stcb); 1420 return (NULL); 1421 } 1422 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 1423 SCTP_TCB_UNLOCK(stcb); 1424 return (NULL); 1425 } 1426 /* 1427 * find and validate the INIT-ACK chunk in the cookie (my info) the 1428 * INIT-ACK follows the INIT chunk 1429 */ 1430 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 1431 initack_cp = (struct sctp_init_ack_chunk *) 1432 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 1433 (uint8_t *)&initack_buf); 1434 if (initack_cp == NULL) { 1435 /* could not pull INIT-ACK chunk in cookie */ 1436 SCTP_TCB_UNLOCK(stcb); 1437 return (NULL); 1438 } 1439 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 1440 SCTP_TCB_UNLOCK(stcb); 1441 return (NULL); 1442 } 1443 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1444 (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) { 1445 /* 1446 * case D in Section 5.2.4 Table 2: MMAA process accordingly 1447 * to get into the OPEN state 1448 */ 1449 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1450 /*- 1451 * Opps, this means that we somehow generated two vtag's 1452 * the same. I.e. we did: 1453 * Us Peer 1454 * <---INIT(tag=a)------ 1455 * ----INIT-ACK(tag=t)--> 1456 * ----INIT(tag=t)------> *1 1457 * <---INIT-ACK(tag=a)--- 1458 * <----CE(tag=t)------------- *2 1459 * 1460 * At point *1 we should be generating a different 1461 * tag t'. Which means we would throw away the CE and send 1462 * ours instead. Basically this is case C (throw away side). 1463 */ 1464 if (how_indx < sizeof(asoc->cookie_how)) 1465 asoc->cookie_how[how_indx] = 17; 1466 SCTP_TCB_UNLOCK(stcb); 1467 return (NULL); 1468 } 1469 switch (SCTP_GET_STATE(stcb)) { 1470 case SCTP_STATE_COOKIE_WAIT: 1471 case SCTP_STATE_COOKIE_ECHOED: 1472 /* 1473 * INIT was sent but got a COOKIE_ECHO with the 1474 * correct tags... just accept it...but we must 1475 * process the init so that we can make sure we have 1476 * the right seq no's. 1477 */ 1478 /* First we must process the INIT !! */ 1479 if (sctp_process_init(init_cp, stcb) < 0) { 1480 if (how_indx < sizeof(asoc->cookie_how)) 1481 asoc->cookie_how[how_indx] = 3; 1482 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 1483 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_init() failed\n"); 1484 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1485 src, dst, sh, op_err, 1486 mflowtype, mflowid, 1487 vrf_id, net->port); 1488 return (NULL); 1489 } 1490 /* we have already processed the INIT so no problem */ 1491 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, 1492 stcb, net, 1493 SCTP_FROM_SCTP_INPUT + SCTP_LOC_13); 1494 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, 1495 stcb, net, 1496 SCTP_FROM_SCTP_INPUT + SCTP_LOC_14); 1497 /* update current state */ 1498 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) 1499 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1500 else 1501 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1502 1503 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 1504 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1505 sctp_stop_all_cookie_timers(stcb); 1506 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1507 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1508 (!SCTP_IS_LISTENING(inp))) { 1509 /* 1510 * Here is where collision would go if we 1511 * did a connect() and instead got a 1512 * init/init-ack/cookie done before the 1513 * init-ack came back.. 1514 */ 1515 sctp_pcb_add_flags(stcb->sctp_ep, SCTP_PCB_FLAGS_CONNECTED); 1516 soisconnected(stcb->sctp_socket); 1517 } 1518 /* notify upper layer */ 1519 *notification = SCTP_NOTIFY_ASSOC_UP; 1520 net->hb_responded = 1; 1521 if (stcb->asoc.sctp_autoclose_ticks && 1522 (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) { 1523 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 1524 inp, stcb, NULL); 1525 } 1526 break; 1527 default: 1528 /* 1529 * we're in the OPEN state (or beyond), so peer must 1530 * have simply lost the COOKIE-ACK 1531 */ 1532 break; 1533 } /* end switch */ 1534 sctp_stop_all_cookie_timers(stcb); 1535 if ((retval = sctp_load_addresses_from_init(stcb, m, 1536 init_offset + sizeof(struct sctp_init_chunk), 1537 initack_offset, src, dst, init_src, stcb->asoc.port)) < 0) { 1538 if (how_indx < sizeof(asoc->cookie_how)) 1539 asoc->cookie_how[how_indx] = 4; 1540 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 1541 "Problem with address parameters"); 1542 SCTPDBG(SCTP_DEBUG_INPUT1, 1543 "Load addresses from INIT causes an abort %d\n", 1544 retval); 1545 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1546 src, dst, sh, op_err, 1547 mflowtype, mflowid, 1548 vrf_id, net->port); 1549 return (NULL); 1550 } 1551 /* respond with a COOKIE-ACK */ 1552 sctp_toss_old_cookies(stcb, asoc); 1553 sctp_send_cookie_ack(stcb); 1554 if (how_indx < sizeof(asoc->cookie_how)) 1555 asoc->cookie_how[how_indx] = 5; 1556 return (stcb); 1557 } 1558 1559 if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1560 ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag && 1561 cookie->tie_tag_my_vtag == 0 && 1562 cookie->tie_tag_peer_vtag == 0) { 1563 /* 1564 * case C in Section 5.2.4 Table 2: XMOO silently discard 1565 */ 1566 if (how_indx < sizeof(asoc->cookie_how)) 1567 asoc->cookie_how[how_indx] = 6; 1568 SCTP_TCB_UNLOCK(stcb); 1569 return (NULL); 1570 } 1571 /* 1572 * If nat support, and the below and stcb is established, send back 1573 * a ABORT(colliding state) if we are established. 1574 */ 1575 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) && 1576 (asoc->peer_supports_nat) && 1577 ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1578 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1579 (asoc->peer_vtag == 0)))) { 1580 /* 1581 * Special case - Peer's support nat. We may have two init's 1582 * that we gave out the same tag on since one was not 1583 * established.. i.e. we get INIT from host-1 behind the nat 1584 * and we respond tag-a, we get a INIT from host-2 behind 1585 * the nat and we get tag-a again. Then we bring up host-1 1586 * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1). 1587 * Now we have colliding state. We must send an abort here 1588 * with colliding state indication. 1589 */ 1590 op_err = sctp_generate_cause(SCTP_CAUSE_NAT_COLLIDING_STATE, ""); 1591 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err, 1592 mflowtype, mflowid, inp->fibnum, 1593 vrf_id, port); 1594 SCTP_TCB_UNLOCK(stcb); 1595 return (NULL); 1596 } 1597 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1598 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1599 (asoc->peer_vtag == 0))) { 1600 /* 1601 * case B in Section 5.2.4 Table 2: MXAA or MOAA my info 1602 * should be ok, re-accept peer info 1603 */ 1604 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1605 /* 1606 * Extension of case C. If we hit this, then the 1607 * random number generator returned the same vtag 1608 * when we first sent our INIT-ACK and when we later 1609 * sent our INIT. The side with the seq numbers that 1610 * are different will be the one that normally would 1611 * have hit case C. This in effect "extends" our 1612 * vtags in this collision case to be 64 bits. The 1613 * same collision could occur aka you get both vtag 1614 * and seq number the same twice in a row.. but is 1615 * much less likely. If it did happen then we would 1616 * proceed through and bring up the assoc.. we may 1617 * end up with the wrong stream setup however.. 1618 * which would be bad.. but there is no way to 1619 * tell.. until we send on a stream that does not 1620 * exist :-) 1621 */ 1622 if (how_indx < sizeof(asoc->cookie_how)) 1623 asoc->cookie_how[how_indx] = 7; 1624 1625 SCTP_TCB_UNLOCK(stcb); 1626 return (NULL); 1627 } 1628 if (how_indx < sizeof(asoc->cookie_how)) 1629 asoc->cookie_how[how_indx] = 8; 1630 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, 1631 SCTP_FROM_SCTP_INPUT + SCTP_LOC_15); 1632 sctp_stop_all_cookie_timers(stcb); 1633 /* 1634 * since we did not send a HB make sure we don't double 1635 * things 1636 */ 1637 net->hb_responded = 1; 1638 if (stcb->asoc.sctp_autoclose_ticks && 1639 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 1640 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, 1641 NULL); 1642 } 1643 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1644 if (asoc->pre_open_streams < asoc->streamoutcnt) { 1645 asoc->pre_open_streams = asoc->streamoutcnt; 1646 } 1647 1648 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) { 1649 /* 1650 * Ok the peer probably discarded our data (if we 1651 * echoed a cookie+data). So anything on the 1652 * sent_queue should be marked for retransmit, we 1653 * may not get something to kick us so it COULD 1654 * still take a timeout to move these.. but it can't 1655 * hurt to mark them. 1656 */ 1657 1658 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 1659 if (chk->sent < SCTP_DATAGRAM_RESEND) { 1660 chk->sent = SCTP_DATAGRAM_RESEND; 1661 sctp_flight_size_decrease(chk); 1662 sctp_total_flight_decrease(stcb, chk); 1663 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 1664 spec_flag++; 1665 } 1666 } 1667 } 1668 /* process the INIT info (peer's info) */ 1669 if (sctp_process_init(init_cp, stcb) < 0) { 1670 if (how_indx < sizeof(asoc->cookie_how)) 1671 asoc->cookie_how[how_indx] = 9; 1672 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 1673 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_init() failed\n"); 1674 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1675 src, dst, sh, op_err, 1676 mflowtype, mflowid, 1677 vrf_id, net->port); 1678 return (NULL); 1679 } 1680 if ((retval = sctp_load_addresses_from_init(stcb, m, 1681 init_offset + sizeof(struct sctp_init_chunk), 1682 initack_offset, src, dst, init_src, stcb->asoc.port)) < 0) { 1683 if (how_indx < sizeof(asoc->cookie_how)) 1684 asoc->cookie_how[how_indx] = 10; 1685 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 1686 "Problem with address parameters"); 1687 SCTPDBG(SCTP_DEBUG_INPUT1, 1688 "Load addresses from INIT causes an abort %d\n", 1689 retval); 1690 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1691 src, dst, sh, op_err, 1692 mflowtype, mflowid, 1693 vrf_id, net->port); 1694 return (NULL); 1695 } 1696 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || 1697 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 1698 *notification = SCTP_NOTIFY_ASSOC_UP; 1699 1700 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1701 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1702 (!SCTP_IS_LISTENING(inp))) { 1703 sctp_pcb_add_flags(stcb->sctp_ep, SCTP_PCB_FLAGS_CONNECTED); 1704 soisconnected(stcb->sctp_socket); 1705 } 1706 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) 1707 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1708 else 1709 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1710 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1711 } else if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) { 1712 SCTP_STAT_INCR_COUNTER32(sctps_restartestab); 1713 } else { 1714 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1715 } 1716 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 1717 sctp_stop_all_cookie_timers(stcb); 1718 sctp_toss_old_cookies(stcb, asoc); 1719 sctp_send_cookie_ack(stcb); 1720 if (spec_flag) { 1721 /* 1722 * only if we have retrans set do we do this. What 1723 * this call does is get only the COOKIE-ACK out and 1724 * then when we return the normal call to 1725 * sctp_chunk_output will get the retrans out behind 1726 * this. 1727 */ 1728 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED); 1729 } 1730 if (how_indx < sizeof(asoc->cookie_how)) 1731 asoc->cookie_how[how_indx] = 11; 1732 1733 return (stcb); 1734 } 1735 if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1736 ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) && 1737 cookie->tie_tag_my_vtag == asoc->my_vtag_nonce && 1738 cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce && 1739 cookie->tie_tag_peer_vtag != 0) { 1740 struct sctpasochead *head; 1741 1742 if (asoc->peer_supports_nat) { 1743 struct sctp_tcb *local_stcb; 1744 1745 /* 1746 * This is a gross gross hack. Just call the 1747 * cookie_new code since we are allowing a duplicate 1748 * association. I hope this works... 1749 */ 1750 local_stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, 1751 sh, cookie, cookie_len, 1752 inp, netp, init_src, notification, 1753 auth_skipped, auth_offset, auth_len, 1754 mflowtype, mflowid, 1755 vrf_id, port); 1756 if (local_stcb == NULL) { 1757 SCTP_TCB_UNLOCK(stcb); 1758 } 1759 return (local_stcb); 1760 } 1761 /* 1762 * case A in Section 5.2.4 Table 2: XXMM (peer restarted) 1763 */ 1764 /* temp code */ 1765 if (how_indx < sizeof(asoc->cookie_how)) 1766 asoc->cookie_how[how_indx] = 12; 1767 sctp_stop_association_timers(stcb, false); 1768 /* notify upper layer */ 1769 *notification = SCTP_NOTIFY_ASSOC_RESTART; 1770 atomic_add_int(&stcb->asoc.refcnt, 1); 1771 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_OPEN) && 1772 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) && 1773 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT)) { 1774 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1775 } 1776 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) { 1777 SCTP_STAT_INCR_GAUGE32(sctps_restartestab); 1778 } else if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) { 1779 SCTP_STAT_INCR_GAUGE32(sctps_collisionestab); 1780 } 1781 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1782 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 1783 1784 } else if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) { 1785 /* move to OPEN state, if not in SHUTDOWN_SENT */ 1786 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 1787 } 1788 if (asoc->pre_open_streams < asoc->streamoutcnt) { 1789 asoc->pre_open_streams = asoc->streamoutcnt; 1790 } 1791 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 1792 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 1793 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 1794 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 1795 asoc->str_reset_seq_in = asoc->init_seq_number; 1796 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 1797 asoc->send_sack = 1; 1798 asoc->data_pkts_seen = 0; 1799 asoc->last_data_chunk_from = NULL; 1800 asoc->last_control_chunk_from = NULL; 1801 asoc->last_net_cmt_send_started = NULL; 1802 if (asoc->mapping_array) { 1803 memset(asoc->mapping_array, 0, 1804 asoc->mapping_array_size); 1805 } 1806 if (asoc->nr_mapping_array) { 1807 memset(asoc->nr_mapping_array, 0, 1808 asoc->mapping_array_size); 1809 } 1810 SCTP_TCB_UNLOCK(stcb); 1811 SCTP_INP_INFO_WLOCK(); 1812 SCTP_INP_WLOCK(stcb->sctp_ep); 1813 SCTP_TCB_LOCK(stcb); 1814 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1815 /* send up all the data */ 1816 sctp_report_all_outbound(stcb, 0, SCTP_SO_LOCKED); 1817 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 1818 stcb->asoc.strmout[i].chunks_on_queues = 0; 1819 #if defined(SCTP_DETAILED_STR_STATS) 1820 for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) { 1821 asoc->strmout[i].abandoned_sent[j] = 0; 1822 asoc->strmout[i].abandoned_unsent[j] = 0; 1823 } 1824 #else 1825 asoc->strmout[i].abandoned_sent[0] = 0; 1826 asoc->strmout[i].abandoned_unsent[0] = 0; 1827 #endif 1828 stcb->asoc.strmout[i].next_mid_ordered = 0; 1829 stcb->asoc.strmout[i].next_mid_unordered = 0; 1830 stcb->asoc.strmout[i].sid = i; 1831 stcb->asoc.strmout[i].last_msg_incomplete = 0; 1832 } 1833 TAILQ_FOREACH_SAFE(strrst, &asoc->resetHead, next_resp, nstrrst) { 1834 TAILQ_REMOVE(&asoc->resetHead, strrst, next_resp); 1835 SCTP_FREE(strrst, SCTP_M_STRESET); 1836 } 1837 TAILQ_FOREACH_SAFE(sq, &asoc->pending_reply_queue, next, nsq) { 1838 TAILQ_REMOVE(&asoc->pending_reply_queue, sq, next); 1839 if (sq->data) { 1840 sctp_m_freem(sq->data); 1841 sq->data = NULL; 1842 } 1843 sctp_free_remote_addr(sq->whoFrom); 1844 sq->whoFrom = NULL; 1845 sq->stcb = NULL; 1846 sctp_free_a_readq(stcb, sq); 1847 } 1848 TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) { 1849 TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next); 1850 if (chk->data) { 1851 sctp_m_freem(chk->data); 1852 chk->data = NULL; 1853 } 1854 if (chk->holds_key_ref) 1855 sctp_auth_key_release(stcb, chk->auth_keyid, SCTP_SO_LOCKED); 1856 sctp_free_remote_addr(chk->whoTo); 1857 SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_chunk), chk); 1858 SCTP_DECR_CHK_COUNT(); 1859 } 1860 asoc->ctrl_queue_cnt = 0; 1861 asoc->str_reset = NULL; 1862 asoc->stream_reset_outstanding = 0; 1863 TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) { 1864 TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next); 1865 if (chk->data) { 1866 sctp_m_freem(chk->data); 1867 chk->data = NULL; 1868 } 1869 if (chk->holds_key_ref) 1870 sctp_auth_key_release(stcb, chk->auth_keyid, SCTP_SO_LOCKED); 1871 sctp_free_remote_addr(chk->whoTo); 1872 SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_chunk), chk); 1873 SCTP_DECR_CHK_COUNT(); 1874 } 1875 TAILQ_FOREACH_SAFE(aparam, &asoc->asconf_queue, next, naparam) { 1876 TAILQ_REMOVE(&asoc->asconf_queue, aparam, next); 1877 SCTP_FREE(aparam, SCTP_M_ASC_ADDR); 1878 } 1879 TAILQ_FOREACH_SAFE(aack, &asoc->asconf_ack_sent, next, naack) { 1880 TAILQ_REMOVE(&asoc->asconf_ack_sent, aack, next); 1881 if (aack->data != NULL) { 1882 sctp_m_freem(aack->data); 1883 } 1884 SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_asconf_ack), aack); 1885 } 1886 asoc->rcv_edmid = cookie->rcv_edmid; 1887 1888 /* process the INIT-ACK info (my info) */ 1889 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 1890 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1891 1892 /* pull from vtag hash */ 1893 LIST_REMOVE(stcb, sctp_asocs); 1894 /* re-insert to new vtag position */ 1895 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, 1896 SCTP_BASE_INFO(hashasocmark))]; 1897 /* 1898 * put it in the bucket in the vtag hash of assoc's for the 1899 * system 1900 */ 1901 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 1902 1903 SCTP_INP_WUNLOCK(stcb->sctp_ep); 1904 SCTP_INP_INFO_WUNLOCK(); 1905 asoc->total_flight = 0; 1906 asoc->total_flight_count = 0; 1907 /* process the INIT info (peer's info) */ 1908 if (sctp_process_init(init_cp, stcb) < 0) { 1909 if (how_indx < sizeof(asoc->cookie_how)) 1910 asoc->cookie_how[how_indx] = 13; 1911 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 1912 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_init() failed\n"); 1913 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1914 src, dst, sh, op_err, 1915 mflowtype, mflowid, 1916 vrf_id, net->port); 1917 return (NULL); 1918 } 1919 /* 1920 * since we did not send a HB make sure we don't double 1921 * things 1922 */ 1923 net->hb_responded = 1; 1924 1925 if ((retval = sctp_load_addresses_from_init(stcb, m, 1926 init_offset + sizeof(struct sctp_init_chunk), 1927 initack_offset, src, dst, init_src, stcb->asoc.port)) < 0) { 1928 if (how_indx < sizeof(asoc->cookie_how)) 1929 asoc->cookie_how[how_indx] = 14; 1930 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 1931 "Problem with address parameters"); 1932 SCTPDBG(SCTP_DEBUG_INPUT1, 1933 "Load addresses from INIT causes an abort %d\n", 1934 retval); 1935 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1936 src, dst, sh, op_err, 1937 mflowtype, mflowid, 1938 vrf_id, net->port); 1939 return (NULL); 1940 } 1941 /* respond with a COOKIE-ACK */ 1942 sctp_send_cookie_ack(stcb); 1943 if (how_indx < sizeof(asoc->cookie_how)) 1944 asoc->cookie_how[how_indx] = 15; 1945 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE) && 1946 (asoc->sctp_autoclose_ticks > 0)) { 1947 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL); 1948 } 1949 return (stcb); 1950 } 1951 if (how_indx < sizeof(asoc->cookie_how)) 1952 asoc->cookie_how[how_indx] = 16; 1953 /* all other cases... */ 1954 SCTP_TCB_UNLOCK(stcb); 1955 return (NULL); 1956 } 1957 1958 /* 1959 * handle a state cookie for a new association m: input packet mbuf chain-- 1960 * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf 1961 * and the cookie signature does not exist offset: offset into mbuf to the 1962 * cookie-echo chunk length: length of the cookie chunk to: where the init 1963 * was from returns a new TCB 1964 */ 1965 static struct sctp_tcb * 1966 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1967 struct sockaddr *src, struct sockaddr *dst, 1968 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1969 struct sctp_inpcb *inp, struct sctp_nets **netp, 1970 struct sockaddr *init_src, int *notification, 1971 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1972 uint8_t mflowtype, uint32_t mflowid, 1973 uint32_t vrf_id, uint16_t port) 1974 { 1975 struct sctp_tcb *stcb; 1976 struct sctp_init_chunk *init_cp, init_buf; 1977 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1978 union sctp_sockstore store; 1979 struct sctp_association *asoc; 1980 int init_offset, initack_offset, initack_limit; 1981 int error = 0; 1982 uint8_t auth_chunk_buf[SCTP_CHUNK_BUFFER_SIZE]; 1983 1984 /* 1985 * find and validate the INIT chunk in the cookie (peer's info) the 1986 * INIT should start after the cookie-echo header struct (chunk 1987 * header, state cookie header struct) 1988 */ 1989 init_offset = offset + sizeof(struct sctp_cookie_echo_chunk); 1990 init_cp = (struct sctp_init_chunk *) 1991 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 1992 (uint8_t *)&init_buf); 1993 if (init_cp == NULL) { 1994 /* could not pull a INIT chunk in cookie */ 1995 SCTPDBG(SCTP_DEBUG_INPUT1, 1996 "process_cookie_new: could not pull INIT chunk hdr\n"); 1997 return (NULL); 1998 } 1999 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 2000 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n"); 2001 return (NULL); 2002 } 2003 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 2004 /* 2005 * find and validate the INIT-ACK chunk in the cookie (my info) the 2006 * INIT-ACK follows the INIT chunk 2007 */ 2008 initack_cp = (struct sctp_init_ack_chunk *) 2009 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 2010 (uint8_t *)&initack_buf); 2011 if (initack_cp == NULL) { 2012 /* could not pull INIT-ACK chunk in cookie */ 2013 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n"); 2014 return (NULL); 2015 } 2016 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 2017 return (NULL); 2018 } 2019 /* 2020 * NOTE: We can't use the INIT_ACK's chk_length to determine the 2021 * "initack_limit" value. This is because the chk_length field 2022 * includes the length of the cookie, but the cookie is omitted when 2023 * the INIT and INIT_ACK are tacked onto the cookie... 2024 */ 2025 initack_limit = offset + cookie_len; 2026 2027 /* 2028 * now that we know the INIT/INIT-ACK are in place, create a new TCB 2029 * and populate 2030 */ 2031 2032 /* 2033 * Here we do a trick, we set in NULL for the proc/thread argument. 2034 * We do this since in effect we only use the p argument when the 2035 * socket is unbound and we must do an implicit bind. Since we are 2036 * getting a cookie, we cannot be unbound. 2037 */ 2038 stcb = sctp_aloc_assoc(inp, init_src, &error, 2039 ntohl(initack_cp->init.initiate_tag), 2040 ntohl(initack_cp->init.initial_tsn), vrf_id, 2041 ntohs(initack_cp->init.num_outbound_streams), 2042 port, 2043 (struct thread *)NULL, 2044 SCTP_DONT_INITIALIZE_AUTH_PARAMS); 2045 if (stcb == NULL) { 2046 struct mbuf *op_err; 2047 2048 /* memory problem? */ 2049 SCTPDBG(SCTP_DEBUG_INPUT1, 2050 "process_cookie_new: no room for another TCB!\n"); 2051 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2052 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2053 src, dst, sh, op_err, 2054 mflowtype, mflowid, 2055 vrf_id, port); 2056 return (NULL); 2057 } 2058 asoc = &stcb->asoc; 2059 /* get scope variables out of cookie */ 2060 asoc->scope.ipv4_local_scope = cookie->ipv4_scope; 2061 asoc->scope.site_scope = cookie->site_scope; 2062 asoc->scope.local_scope = cookie->local_scope; 2063 asoc->scope.loopback_scope = cookie->loopback_scope; 2064 2065 if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) || 2066 (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) { 2067 struct mbuf *op_err; 2068 2069 /* 2070 * Houston we have a problem. The EP changed while the 2071 * cookie was in flight. Only recourse is to abort the 2072 * association. 2073 */ 2074 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2075 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2076 src, dst, sh, op_err, 2077 mflowtype, mflowid, 2078 vrf_id, port); 2079 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2080 SCTP_FROM_SCTP_INPUT + SCTP_LOC_18); 2081 return (NULL); 2082 } 2083 asoc->rcv_edmid = cookie->rcv_edmid; 2084 /* process the INIT-ACK info (my info) */ 2085 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 2086 2087 /* process the INIT info (peer's info) */ 2088 if (sctp_process_init(init_cp, stcb) < 0) { 2089 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2090 SCTP_FROM_SCTP_INPUT + SCTP_LOC_19); 2091 return (NULL); 2092 } 2093 /* load all addresses */ 2094 if (sctp_load_addresses_from_init(stcb, m, 2095 init_offset + sizeof(struct sctp_init_chunk), 2096 initack_offset, src, dst, init_src, port) < 0) { 2097 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2098 SCTP_FROM_SCTP_INPUT + SCTP_LOC_20); 2099 return (NULL); 2100 } 2101 /* 2102 * verify any preceding AUTH chunk that was skipped 2103 */ 2104 /* pull the local authentication parameters from the cookie/init-ack */ 2105 sctp_auth_get_cookie_params(stcb, m, 2106 initack_offset + sizeof(struct sctp_init_ack_chunk), 2107 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk))); 2108 if (auth_skipped) { 2109 struct sctp_auth_chunk *auth; 2110 2111 if (auth_len <= SCTP_CHUNK_BUFFER_SIZE) { 2112 auth = (struct sctp_auth_chunk *)sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf); 2113 } else { 2114 auth = NULL; 2115 } 2116 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) { 2117 /* auth HMAC failed, dump the assoc and packet */ 2118 SCTPDBG(SCTP_DEBUG_AUTH1, 2119 "COOKIE-ECHO: AUTH failed\n"); 2120 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2121 SCTP_FROM_SCTP_INPUT + SCTP_LOC_21); 2122 return (NULL); 2123 } else { 2124 /* remaining chunks checked... good to go */ 2125 stcb->asoc.authenticated = 1; 2126 } 2127 } 2128 2129 /* 2130 * if we're doing ASCONFs, check to see if we have any new local 2131 * addresses that need to get added to the peer (eg. addresses 2132 * changed while cookie echo in flight). This needs to be done 2133 * after we go to the OPEN state to do the correct asconf 2134 * processing. else, make sure we have the correct addresses in our 2135 * lists 2136 */ 2137 2138 /* warning, we re-use sin, sin6, sa_store here! */ 2139 /* pull in local_address (our "from" address) */ 2140 switch (cookie->laddr_type) { 2141 #ifdef INET 2142 case SCTP_IPV4_ADDRESS: 2143 /* source addr is IPv4 */ 2144 memset(&store.sin, 0, sizeof(struct sockaddr_in)); 2145 store.sin.sin_family = AF_INET; 2146 store.sin.sin_len = sizeof(struct sockaddr_in); 2147 store.sin.sin_addr.s_addr = cookie->laddress[0]; 2148 break; 2149 #endif 2150 #ifdef INET6 2151 case SCTP_IPV6_ADDRESS: 2152 /* source addr is IPv6 */ 2153 memset(&store.sin6, 0, sizeof(struct sockaddr_in6)); 2154 store.sin6.sin6_family = AF_INET6; 2155 store.sin6.sin6_len = sizeof(struct sockaddr_in6); 2156 store.sin6.sin6_scope_id = cookie->scope_id; 2157 memcpy(&store.sin6.sin6_addr, cookie->laddress, sizeof(struct in6_addr)); 2158 break; 2159 #endif 2160 default: 2161 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2162 SCTP_FROM_SCTP_INPUT + SCTP_LOC_22); 2163 return (NULL); 2164 } 2165 2166 /* update current state */ 2167 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2168 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 2169 sctp_stop_all_cookie_timers(stcb); 2170 SCTP_STAT_INCR_COUNTER32(sctps_passiveestab); 2171 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2172 2173 /* set up to notify upper layer */ 2174 *notification = SCTP_NOTIFY_ASSOC_UP; 2175 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2176 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 2177 (!SCTP_IS_LISTENING(inp))) { 2178 /* 2179 * This is an endpoint that called connect() how it got a 2180 * cookie that is NEW is a bit of a mystery. It must be that 2181 * the INIT was sent, but before it got there.. a complete 2182 * INIT/INIT-ACK/COOKIE arrived. But of course then it 2183 * should have went to the other code.. not here.. oh well.. 2184 * a bit of protection is worth having.. 2185 * 2186 * XXXMJ unlocked 2187 */ 2188 sctp_pcb_add_flags(stcb->sctp_ep, SCTP_PCB_FLAGS_CONNECTED); 2189 soisconnected(stcb->sctp_socket); 2190 } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 2191 (SCTP_IS_LISTENING(inp))) { 2192 /* 2193 * We don't want to do anything with this one. Since it is 2194 * the listening guy. The timer will get started for 2195 * accepted connections in the caller. 2196 */ 2197 ; 2198 } 2199 if (stcb->asoc.sctp_autoclose_ticks && 2200 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2201 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL); 2202 } 2203 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 2204 *netp = sctp_findnet(stcb, init_src); 2205 if (*netp != NULL) { 2206 /* 2207 * Since we did not send a HB, make sure we don't double 2208 * things. 2209 */ 2210 (*netp)->hb_responded = 1; 2211 } 2212 /* respond with a COOKIE-ACK */ 2213 sctp_send_cookie_ack(stcb); 2214 2215 /* 2216 * check the address lists for any ASCONFs that need to be sent 2217 * AFTER the cookie-ack is sent 2218 */ 2219 sctp_check_address_list(stcb, m, 2220 initack_offset + sizeof(struct sctp_init_ack_chunk), 2221 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)), 2222 &store.sa, cookie->local_scope, cookie->site_scope, 2223 cookie->ipv4_scope, cookie->loopback_scope); 2224 2225 return (stcb); 2226 } 2227 2228 /* 2229 * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e 2230 * we NEED to make sure we are not already using the vtag. If so we 2231 * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit! 2232 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag, 2233 SCTP_BASE_INFO(hashasocmark))]; 2234 LIST_FOREACH(stcb, head, sctp_asocs) { 2235 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep)) { 2236 -- SEND ABORT - TRY AGAIN -- 2237 } 2238 } 2239 */ 2240 2241 /* 2242 * handles a COOKIE-ECHO message stcb: modified to either a new or left as 2243 * existing (non-NULL) TCB 2244 */ 2245 static struct mbuf * 2246 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset, 2247 struct sockaddr *src, struct sockaddr *dst, 2248 struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp, 2249 struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp, 2250 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2251 struct sctp_tcb **locked_tcb, 2252 uint8_t mflowtype, uint32_t mflowid, 2253 uint32_t vrf_id, uint16_t port) 2254 { 2255 struct sctp_state_cookie *cookie; 2256 struct sctp_tcb *l_stcb = *stcb; 2257 struct sctp_inpcb *l_inp; 2258 struct sockaddr *to; 2259 struct sctp_pcb *ep; 2260 struct mbuf *m_sig; 2261 uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE]; 2262 uint8_t *sig; 2263 uint8_t cookie_ok = 0; 2264 unsigned int sig_offset, cookie_offset; 2265 unsigned int cookie_len; 2266 struct timeval now; 2267 struct timeval time_entered, time_expires; 2268 int notification = 0; 2269 struct sctp_nets *netl; 2270 int had_a_existing_tcb = 0; 2271 int send_int_conf = 0; 2272 #ifdef INET 2273 struct sockaddr_in sin; 2274 #endif 2275 #ifdef INET6 2276 struct sockaddr_in6 sin6; 2277 #endif 2278 2279 SCTPDBG(SCTP_DEBUG_INPUT2, 2280 "sctp_handle_cookie: handling COOKIE-ECHO\n"); 2281 2282 if (inp_p == NULL) { 2283 return (NULL); 2284 } 2285 cookie = &cp->cookie; 2286 cookie_offset = offset + sizeof(struct sctp_chunkhdr); 2287 cookie_len = ntohs(cp->ch.chunk_length); 2288 2289 if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) + 2290 sizeof(struct sctp_init_chunk) + 2291 sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) { 2292 /* cookie too small */ 2293 return (NULL); 2294 } 2295 if ((cookie->peerport != sh->src_port) || 2296 (cookie->myport != sh->dest_port) || 2297 (cookie->my_vtag != sh->v_tag)) { 2298 /* 2299 * invalid ports or bad tag. Note that we always leave the 2300 * v_tag in the header in network order and when we stored 2301 * it in the my_vtag slot we also left it in network order. 2302 * This maintains the match even though it may be in the 2303 * opposite byte order of the machine :-> 2304 */ 2305 return (NULL); 2306 } 2307 /* 2308 * split off the signature into its own mbuf (since it should not be 2309 * calculated in the sctp_hmac_m() call). 2310 */ 2311 sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE; 2312 m_sig = m_split(m, sig_offset, M_NOWAIT); 2313 if (m_sig == NULL) { 2314 /* out of memory or ?? */ 2315 return (NULL); 2316 } 2317 #ifdef SCTP_MBUF_LOGGING 2318 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 2319 sctp_log_mbc(m_sig, SCTP_MBUF_SPLIT); 2320 } 2321 #endif 2322 2323 /* 2324 * compute the signature/digest for the cookie 2325 */ 2326 if (l_stcb != NULL) { 2327 atomic_add_int(&l_stcb->asoc.refcnt, 1); 2328 SCTP_TCB_UNLOCK(l_stcb); 2329 } 2330 l_inp = *inp_p; 2331 SCTP_INP_RLOCK(l_inp); 2332 if (l_stcb != NULL) { 2333 SCTP_TCB_LOCK(l_stcb); 2334 atomic_subtract_int(&l_stcb->asoc.refcnt, 1); 2335 } 2336 if (l_inp->sctp_flags & (SCTP_PCB_FLAGS_SOCKET_GONE | SCTP_PCB_FLAGS_SOCKET_ALLGONE)) { 2337 SCTP_INP_RUNLOCK(l_inp); 2338 sctp_m_freem(m_sig); 2339 return (NULL); 2340 } 2341 ep = &(*inp_p)->sctp_ep; 2342 /* which cookie is it? */ 2343 if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) && 2344 (ep->current_secret_number != ep->last_secret_number)) { 2345 /* it's the old cookie */ 2346 (void)sctp_hmac_m(SCTP_HMAC, 2347 (uint8_t *)ep->secret_key[(int)ep->last_secret_number], 2348 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2349 } else { 2350 /* it's the current cookie */ 2351 (void)sctp_hmac_m(SCTP_HMAC, 2352 (uint8_t *)ep->secret_key[(int)ep->current_secret_number], 2353 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2354 } 2355 /* get the signature */ 2356 SCTP_INP_RUNLOCK(l_inp); 2357 sig = (uint8_t *)sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *)&tmp_sig); 2358 if (sig == NULL) { 2359 /* couldn't find signature */ 2360 sctp_m_freem(m_sig); 2361 return (NULL); 2362 } 2363 /* compare the received digest with the computed digest */ 2364 if (timingsafe_bcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) { 2365 /* try the old cookie? */ 2366 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) && 2367 (ep->current_secret_number != ep->last_secret_number)) { 2368 /* compute digest with old */ 2369 (void)sctp_hmac_m(SCTP_HMAC, 2370 (uint8_t *)ep->secret_key[(int)ep->last_secret_number], 2371 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2372 /* compare */ 2373 if (timingsafe_bcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0) 2374 cookie_ok = 1; 2375 } 2376 } else { 2377 cookie_ok = 1; 2378 } 2379 2380 /* 2381 * Now before we continue we must reconstruct our mbuf so that 2382 * normal processing of any other chunks will work. 2383 */ 2384 { 2385 struct mbuf *m_at; 2386 2387 m_at = m; 2388 while (SCTP_BUF_NEXT(m_at) != NULL) { 2389 m_at = SCTP_BUF_NEXT(m_at); 2390 } 2391 SCTP_BUF_NEXT(m_at) = m_sig; 2392 } 2393 2394 if (cookie_ok == 0) { 2395 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n"); 2396 SCTPDBG(SCTP_DEBUG_INPUT2, 2397 "offset = %u, cookie_offset = %u, sig_offset = %u\n", 2398 (uint32_t)offset, cookie_offset, sig_offset); 2399 return (NULL); 2400 } 2401 2402 if (sctp_ticks_to_msecs(cookie->cookie_life) > SCTP_MAX_COOKIE_LIFE) { 2403 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: Invalid cookie lifetime\n"); 2404 return (NULL); 2405 } 2406 time_entered.tv_sec = cookie->time_entered.tv_sec; 2407 time_entered.tv_usec = cookie->time_entered.tv_usec; 2408 if ((time_entered.tv_sec < 0) || 2409 (time_entered.tv_usec < 0) || 2410 (time_entered.tv_usec >= 1000000)) { 2411 /* Invalid time stamp. Cookie must have been modified. */ 2412 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: Invalid time stamp\n"); 2413 return (NULL); 2414 } 2415 (void)SCTP_GETTIME_TIMEVAL(&now); 2416 if (timevalcmp(&now, &time_entered, <)) { 2417 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie generated in the future!\n"); 2418 return (NULL); 2419 } 2420 /* 2421 * Check the cookie timestamps to be sure it's not stale. 2422 * cookie_life is in ticks, so we convert to seconds. 2423 */ 2424 time_expires.tv_sec = time_entered.tv_sec + sctp_ticks_to_secs(cookie->cookie_life); 2425 time_expires.tv_usec = time_entered.tv_usec; 2426 if (timevalcmp(&now, &time_expires, >)) { 2427 /* cookie is stale! */ 2428 struct mbuf *op_err; 2429 struct sctp_error_stale_cookie *cause; 2430 struct timeval diff; 2431 uint32_t staleness; 2432 2433 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_error_stale_cookie), 2434 0, M_NOWAIT, 1, MT_DATA); 2435 if (op_err == NULL) { 2436 /* FOOBAR */ 2437 return (NULL); 2438 } 2439 /* Set the len */ 2440 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_error_stale_cookie); 2441 cause = mtod(op_err, struct sctp_error_stale_cookie *); 2442 cause->cause.code = htons(SCTP_CAUSE_STALE_COOKIE); 2443 cause->cause.length = htons(sizeof(struct sctp_error_stale_cookie)); 2444 diff = now; 2445 timevalsub(&diff, &time_expires); 2446 if ((uint32_t)diff.tv_sec > UINT32_MAX / 1000000) { 2447 staleness = UINT32_MAX; 2448 } else { 2449 staleness = (uint32_t)diff.tv_sec * 1000000; 2450 } 2451 if (UINT32_MAX - staleness >= (uint32_t)diff.tv_usec) { 2452 staleness += (uint32_t)diff.tv_usec; 2453 } else { 2454 staleness = UINT32_MAX; 2455 } 2456 cause->stale_time = htonl(staleness); 2457 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 2458 mflowtype, mflowid, l_inp->fibnum, 2459 vrf_id, port); 2460 return (NULL); 2461 } 2462 /* 2463 * Now we must see with the lookup address if we have an existing 2464 * asoc. This will only happen if we were in the COOKIE-WAIT state 2465 * and a INIT collided with us and somewhere the peer sent the 2466 * cookie on another address besides the single address our assoc 2467 * had for him. In this case we will have one of the tie-tags set at 2468 * least AND the address field in the cookie can be used to look it 2469 * up. 2470 */ 2471 to = NULL; 2472 switch (cookie->addr_type) { 2473 #ifdef INET6 2474 case SCTP_IPV6_ADDRESS: 2475 memset(&sin6, 0, sizeof(sin6)); 2476 sin6.sin6_family = AF_INET6; 2477 sin6.sin6_len = sizeof(sin6); 2478 sin6.sin6_port = sh->src_port; 2479 sin6.sin6_scope_id = cookie->scope_id; 2480 memcpy(&sin6.sin6_addr.s6_addr, cookie->address, 2481 sizeof(sin6.sin6_addr.s6_addr)); 2482 to = (struct sockaddr *)&sin6; 2483 break; 2484 #endif 2485 #ifdef INET 2486 case SCTP_IPV4_ADDRESS: 2487 memset(&sin, 0, sizeof(sin)); 2488 sin.sin_family = AF_INET; 2489 sin.sin_len = sizeof(sin); 2490 sin.sin_port = sh->src_port; 2491 sin.sin_addr.s_addr = cookie->address[0]; 2492 to = (struct sockaddr *)&sin; 2493 break; 2494 #endif 2495 default: 2496 /* This should not happen */ 2497 return (NULL); 2498 } 2499 if (*stcb == NULL) { 2500 /* Yep, lets check */ 2501 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL); 2502 if (*stcb == NULL) { 2503 /* 2504 * We should have only got back the same inp. If we 2505 * got back a different ep we have a problem. The 2506 * original findep got back l_inp and now 2507 */ 2508 if (l_inp != *inp_p) { 2509 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n"); 2510 } 2511 } else { 2512 if (*locked_tcb == NULL) { 2513 /* 2514 * In this case we found the assoc only 2515 * after we locked the create lock. This 2516 * means we are in a colliding case and we 2517 * must make sure that we unlock the tcb if 2518 * its one of the cases where we throw away 2519 * the incoming packets. 2520 */ 2521 *locked_tcb = *stcb; 2522 2523 /* 2524 * We must also increment the inp ref count 2525 * since the ref_count flags was set when we 2526 * did not find the TCB, now we found it 2527 * which reduces the refcount.. we must 2528 * raise it back out to balance it all :-) 2529 */ 2530 SCTP_INP_INCR_REF((*stcb)->sctp_ep); 2531 if ((*stcb)->sctp_ep != l_inp) { 2532 SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n", 2533 (void *)(*stcb)->sctp_ep, (void *)l_inp); 2534 } 2535 } 2536 } 2537 } 2538 2539 cookie_len -= SCTP_SIGNATURE_SIZE; 2540 if (*stcb == NULL) { 2541 /* this is the "normal" case... get a new TCB */ 2542 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh, 2543 cookie, cookie_len, *inp_p, 2544 netp, to, ¬ification, 2545 auth_skipped, auth_offset, auth_len, 2546 mflowtype, mflowid, 2547 vrf_id, port); 2548 } else { 2549 /* this is abnormal... cookie-echo on existing TCB */ 2550 had_a_existing_tcb = 1; 2551 *stcb = sctp_process_cookie_existing(m, iphlen, offset, 2552 src, dst, sh, 2553 cookie, cookie_len, *inp_p, *stcb, netp, to, 2554 ¬ification, auth_skipped, auth_offset, auth_len, 2555 mflowtype, mflowid, 2556 vrf_id, port); 2557 if (*stcb == NULL) { 2558 *locked_tcb = NULL; 2559 } 2560 } 2561 2562 if (*stcb == NULL) { 2563 /* still no TCB... must be bad cookie-echo */ 2564 return (NULL); 2565 } 2566 if (*netp != NULL) { 2567 (*netp)->flowtype = mflowtype; 2568 (*netp)->flowid = mflowid; 2569 } 2570 /* 2571 * Ok, we built an association so confirm the address we sent the 2572 * INIT-ACK to. 2573 */ 2574 netl = sctp_findnet(*stcb, to); 2575 /* 2576 * This code should in theory NOT run but 2577 */ 2578 if (netl == NULL) { 2579 /* TSNH! Huh, why do I need to add this address here? */ 2580 if (sctp_add_remote_addr(*stcb, to, NULL, port, 2581 SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) { 2582 return (NULL); 2583 } 2584 netl = sctp_findnet(*stcb, to); 2585 } 2586 if (netl) { 2587 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) { 2588 netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 2589 (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL, 2590 netl); 2591 send_int_conf = 1; 2592 } 2593 } 2594 sctp_start_net_timers(*stcb); 2595 if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) { 2596 if (!had_a_existing_tcb || 2597 (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) { 2598 /* 2599 * If we have a NEW cookie or the connect never 2600 * reached the connected state during collision we 2601 * must do the TCP accept thing. 2602 */ 2603 struct socket *so, *oso; 2604 struct sctp_inpcb *inp; 2605 2606 if (notification == SCTP_NOTIFY_ASSOC_RESTART) { 2607 /* 2608 * For a restart we will keep the same 2609 * socket, no need to do anything. I THINK!! 2610 */ 2611 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2612 if (send_int_conf) { 2613 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2614 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2615 } 2616 return (m); 2617 } 2618 oso = (*inp_p)->sctp_socket; 2619 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2620 SCTP_TCB_UNLOCK((*stcb)); 2621 CURVNET_SET(oso->so_vnet); 2622 so = sonewconn(oso, 0 2623 ); 2624 CURVNET_RESTORE(); 2625 SCTP_TCB_LOCK((*stcb)); 2626 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2627 2628 if (so == NULL) { 2629 struct mbuf *op_err; 2630 2631 /* Too many sockets */ 2632 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n"); 2633 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2634 sctp_abort_association(*inp_p, NULL, m, iphlen, 2635 src, dst, sh, op_err, 2636 mflowtype, mflowid, 2637 vrf_id, port); 2638 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, 2639 SCTP_FROM_SCTP_INPUT + SCTP_LOC_23); 2640 return (NULL); 2641 } 2642 inp = (struct sctp_inpcb *)so->so_pcb; 2643 SCTP_INP_INCR_REF(inp); 2644 /* 2645 * We add the unbound flag here so that if we get an 2646 * soabort() before we get the move_pcb done, we 2647 * will properly cleanup. 2648 */ 2649 inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE | 2650 SCTP_PCB_FLAGS_CONNECTED | 2651 SCTP_PCB_FLAGS_IN_TCPPOOL | 2652 SCTP_PCB_FLAGS_UNBOUND | 2653 (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) | 2654 SCTP_PCB_FLAGS_DONT_WAKE); 2655 inp->sctp_features = (*inp_p)->sctp_features; 2656 inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features; 2657 inp->sctp_socket = so; 2658 inp->sctp_frag_point = (*inp_p)->sctp_frag_point; 2659 inp->max_cwnd = (*inp_p)->max_cwnd; 2660 inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off; 2661 inp->ecn_supported = (*inp_p)->ecn_supported; 2662 inp->prsctp_supported = (*inp_p)->prsctp_supported; 2663 inp->auth_supported = (*inp_p)->auth_supported; 2664 inp->asconf_supported = (*inp_p)->asconf_supported; 2665 inp->reconfig_supported = (*inp_p)->reconfig_supported; 2666 inp->nrsack_supported = (*inp_p)->nrsack_supported; 2667 inp->pktdrop_supported = (*inp_p)->pktdrop_supported; 2668 inp->partial_delivery_point = (*inp_p)->partial_delivery_point; 2669 inp->sctp_context = (*inp_p)->sctp_context; 2670 inp->local_strreset_support = (*inp_p)->local_strreset_support; 2671 inp->fibnum = (*inp_p)->fibnum; 2672 /* 2673 * copy in the authentication parameters from the 2674 * original endpoint 2675 */ 2676 if (inp->sctp_ep.local_hmacs) 2677 sctp_free_hmaclist(inp->sctp_ep.local_hmacs); 2678 inp->sctp_ep.local_hmacs = 2679 sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs); 2680 if (inp->sctp_ep.local_auth_chunks) 2681 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks); 2682 inp->sctp_ep.local_auth_chunks = 2683 sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks); 2684 2685 /* 2686 * Now we must move it from one hash table to 2687 * another and get the tcb in the right place. 2688 */ 2689 2690 /* 2691 * This is where the one-2-one socket is put into 2692 * the accept state waiting for the accept! 2693 */ 2694 if (*stcb) { 2695 SCTP_ADD_SUBSTATE(*stcb, SCTP_STATE_IN_ACCEPT_QUEUE); 2696 } 2697 sctp_move_pcb_and_assoc(*inp_p, inp, *stcb); 2698 2699 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2700 SCTP_TCB_UNLOCK((*stcb)); 2701 2702 sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb, 2703 0); 2704 SCTP_TCB_LOCK((*stcb)); 2705 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2706 2707 /* 2708 * now we must check to see if we were aborted while 2709 * the move was going on and the lock/unlock 2710 * happened. 2711 */ 2712 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 2713 /* 2714 * yep it was, we leave the assoc attached 2715 * to the socket since the sctp_inpcb_free() 2716 * call will send an abort for us. 2717 */ 2718 SCTP_INP_DECR_REF(inp); 2719 return (NULL); 2720 } 2721 SCTP_INP_DECR_REF(inp); 2722 /* Switch over to the new guy */ 2723 *inp_p = inp; 2724 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2725 if (send_int_conf) { 2726 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2727 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2728 } 2729 2730 /* 2731 * Pull it from the incomplete queue and wake the 2732 * guy 2733 */ 2734 soisconnected(so); 2735 return (m); 2736 } 2737 } 2738 if (notification) { 2739 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2740 } 2741 if (send_int_conf) { 2742 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2743 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2744 } 2745 return (m); 2746 } 2747 2748 static void 2749 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED, 2750 struct sctp_tcb *stcb, struct sctp_nets *net) 2751 { 2752 /* cp must not be used, others call this without a c-ack :-) */ 2753 struct sctp_association *asoc; 2754 struct sctp_tmit_chunk *chk; 2755 2756 SCTPDBG(SCTP_DEBUG_INPUT2, 2757 "sctp_handle_cookie_ack: handling COOKIE-ACK\n"); 2758 if ((stcb == NULL) || (net == NULL)) { 2759 return; 2760 } 2761 2762 asoc = &stcb->asoc; 2763 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 2764 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 2765 asoc->overall_error_count, 2766 0, 2767 SCTP_FROM_SCTP_INPUT, 2768 __LINE__); 2769 } 2770 sctp_stop_all_cookie_timers(stcb); 2771 sctp_toss_old_cookies(stcb, asoc); 2772 /* process according to association state */ 2773 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) { 2774 /* state change only needed when I am in right state */ 2775 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2776 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 2777 sctp_start_net_timers(stcb); 2778 /* update RTO */ 2779 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 2780 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2781 if (asoc->overall_error_count == 0) { 2782 sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, 2783 SCTP_RTT_FROM_NON_DATA); 2784 } 2785 /* 2786 * Since we did not send a HB make sure we don't double 2787 * things. 2788 */ 2789 asoc->overall_error_count = 0; 2790 net->hb_responded = 1; 2791 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 2792 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2793 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2794 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 2795 sctp_pcb_add_flags(stcb->sctp_ep, SCTP_PCB_FLAGS_CONNECTED); 2796 if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) { 2797 soisconnected(stcb->sctp_socket); 2798 } 2799 } 2800 2801 if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) && 2802 TAILQ_EMPTY(&asoc->send_queue) && 2803 TAILQ_EMPTY(&asoc->sent_queue) && 2804 (asoc->stream_queue_cnt == 0)) { 2805 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 2806 SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_SENT); 2807 sctp_stop_timers_for_shutdown(stcb); 2808 sctp_send_shutdown(stcb, net); 2809 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, 2810 stcb->sctp_ep, stcb, net); 2811 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2812 stcb->sctp_ep, stcb, NULL); 2813 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_T3, SCTP_SO_LOCKED); 2814 } 2815 2816 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2817 /* 2818 * We don't need to do the asconf thing, nor hb or 2819 * autoclose if the socket is closed. 2820 */ 2821 goto closed_socket; 2822 } 2823 2824 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 2825 stcb, net); 2826 2827 if (stcb->asoc.sctp_autoclose_ticks && 2828 sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2829 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 2830 stcb->sctp_ep, stcb, NULL); 2831 } 2832 /* 2833 * send ASCONF if parameters are pending and ASCONFs are 2834 * allowed (eg. addresses changed when init/cookie echo were 2835 * in flight) 2836 */ 2837 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) && 2838 (stcb->asoc.asconf_supported == 1) && 2839 (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) { 2840 #ifdef SCTP_TIMER_BASED_ASCONF 2841 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, 2842 stcb->sctp_ep, stcb, 2843 stcb->asoc.primary_destination); 2844 #else 2845 sctp_send_asconf(stcb, stcb->asoc.primary_destination, 2846 SCTP_ADDR_NOT_LOCKED); 2847 #endif 2848 } 2849 } 2850 closed_socket: 2851 /* Restart the timer if we have pending data */ 2852 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) { 2853 if (chk->whoTo != NULL) { 2854 break; 2855 } 2856 } 2857 if (chk != NULL) { 2858 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 2859 } 2860 } 2861 2862 static void 2863 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp, 2864 struct sctp_tcb *stcb) 2865 { 2866 struct sctp_nets *net; 2867 struct sctp_tmit_chunk *lchk; 2868 struct sctp_ecne_chunk bkup; 2869 uint8_t override_bit; 2870 uint32_t tsn, window_data_tsn; 2871 int len; 2872 unsigned int pkt_cnt; 2873 2874 len = ntohs(cp->ch.chunk_length); 2875 if (len == sizeof(struct old_sctp_ecne_chunk)) { 2876 /* Its the old format */ 2877 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk)); 2878 bkup.num_pkts_since_cwr = htonl(1); 2879 cp = &bkup; 2880 } 2881 SCTP_STAT_INCR(sctps_recvecne); 2882 tsn = ntohl(cp->tsn); 2883 pkt_cnt = ntohl(cp->num_pkts_since_cwr); 2884 lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead); 2885 if (lchk == NULL) { 2886 window_data_tsn = stcb->asoc.sending_seq - 1; 2887 } else { 2888 window_data_tsn = lchk->rec.data.tsn; 2889 } 2890 2891 /* Find where it was sent to if possible. */ 2892 net = NULL; 2893 TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) { 2894 if (lchk->rec.data.tsn == tsn) { 2895 net = lchk->whoTo; 2896 net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send; 2897 break; 2898 } 2899 if (SCTP_TSN_GT(lchk->rec.data.tsn, tsn)) { 2900 break; 2901 } 2902 } 2903 if (net == NULL) { 2904 /* 2905 * What to do. A previous send of a CWR was possibly lost. 2906 * See how old it is, we may have it marked on the actual 2907 * net. 2908 */ 2909 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 2910 if (tsn == net->last_cwr_tsn) { 2911 /* Found him, send it off */ 2912 break; 2913 } 2914 } 2915 if (net == NULL) { 2916 /* 2917 * If we reach here, we need to send a special CWR 2918 * that says hey, we did this a long time ago and 2919 * you lost the response. 2920 */ 2921 net = TAILQ_FIRST(&stcb->asoc.nets); 2922 if (net == NULL) { 2923 /* TSNH */ 2924 return; 2925 } 2926 override_bit = SCTP_CWR_REDUCE_OVERRIDE; 2927 } else { 2928 override_bit = 0; 2929 } 2930 } else { 2931 override_bit = 0; 2932 } 2933 if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) && 2934 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 2935 /* 2936 * JRS - Use the congestion control given in the pluggable 2937 * CC module 2938 */ 2939 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt); 2940 /* 2941 * We reduce once every RTT. So we will only lower cwnd at 2942 * the next sending seq i.e. the window_data_tsn 2943 */ 2944 net->cwr_window_tsn = window_data_tsn; 2945 net->ecn_ce_pkt_cnt += pkt_cnt; 2946 net->lost_cnt = pkt_cnt; 2947 net->last_cwr_tsn = tsn; 2948 } else { 2949 override_bit |= SCTP_CWR_IN_SAME_WINDOW; 2950 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) && 2951 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 2952 /* 2953 * Another loss in the same window update how many 2954 * marks/packets lost we have had. 2955 */ 2956 int cnt = 1; 2957 2958 if (pkt_cnt > net->lost_cnt) { 2959 /* Should be the case */ 2960 cnt = (pkt_cnt - net->lost_cnt); 2961 net->ecn_ce_pkt_cnt += cnt; 2962 } 2963 net->lost_cnt = pkt_cnt; 2964 net->last_cwr_tsn = tsn; 2965 /* 2966 * Most CC functions will ignore this call, since we 2967 * are in-window yet of the initial CE the peer saw. 2968 */ 2969 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt); 2970 } 2971 } 2972 /* 2973 * We always send a CWR this way if our previous one was lost our 2974 * peer will get an update, or if it is not time again to reduce we 2975 * still get the cwr to the peer. Note we set the override when we 2976 * could not find the TSN on the chunk or the destination network. 2977 */ 2978 sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit); 2979 } 2980 2981 static void 2982 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net) 2983 { 2984 /* 2985 * Here we get a CWR from the peer. We must look in the outqueue and 2986 * make sure that we have a covered ECNE in the control chunk part. 2987 * If so remove it. 2988 */ 2989 struct sctp_tmit_chunk *chk, *nchk; 2990 struct sctp_ecne_chunk *ecne; 2991 int override; 2992 uint32_t cwr_tsn; 2993 2994 cwr_tsn = ntohl(cp->tsn); 2995 override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE; 2996 TAILQ_FOREACH_SAFE(chk, &stcb->asoc.control_send_queue, sctp_next, nchk) { 2997 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) { 2998 continue; 2999 } 3000 if ((override == 0) && (chk->whoTo != net)) { 3001 /* Must be from the right src unless override is set */ 3002 continue; 3003 } 3004 ecne = mtod(chk->data, struct sctp_ecne_chunk *); 3005 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) { 3006 /* this covers this ECNE, we can remove it */ 3007 stcb->asoc.ecn_echo_cnt_onq--; 3008 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, 3009 sctp_next); 3010 stcb->asoc.ctrl_queue_cnt--; 3011 sctp_m_freem(chk->data); 3012 chk->data = NULL; 3013 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3014 if (override == 0) { 3015 break; 3016 } 3017 } 3018 } 3019 } 3020 3021 static void 3022 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED, 3023 struct sctp_tcb *stcb, struct sctp_nets *net) 3024 { 3025 3026 SCTPDBG(SCTP_DEBUG_INPUT2, 3027 "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n"); 3028 if (stcb == NULL) 3029 return; 3030 3031 /* process according to association state */ 3032 if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 3033 /* unexpected SHUTDOWN-COMPLETE... so ignore... */ 3034 SCTPDBG(SCTP_DEBUG_INPUT2, 3035 "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n"); 3036 SCTP_TCB_UNLOCK(stcb); 3037 return; 3038 } 3039 /* notify upper layer protocol */ 3040 if (stcb->sctp_socket) { 3041 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 3042 } 3043 #ifdef INVARIANTS 3044 if (!TAILQ_EMPTY(&stcb->asoc.send_queue) || 3045 !TAILQ_EMPTY(&stcb->asoc.sent_queue) || 3046 sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) { 3047 panic("Queues are not empty when handling SHUTDOWN-COMPLETE"); 3048 } 3049 #endif 3050 /* stop the timer */ 3051 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, 3052 SCTP_FROM_SCTP_INPUT + SCTP_LOC_24); 3053 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 3054 /* free the TCB */ 3055 SCTPDBG(SCTP_DEBUG_INPUT2, 3056 "sctp_handle_shutdown_complete: calls free-asoc\n"); 3057 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 3058 SCTP_FROM_SCTP_INPUT + SCTP_LOC_25); 3059 return; 3060 } 3061 3062 static int 3063 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc, 3064 struct sctp_nets *net, uint8_t flg) 3065 { 3066 switch (desc->chunk_type) { 3067 case SCTP_DATA: 3068 case SCTP_IDATA: 3069 /* find the tsn to resend (possibly) */ 3070 { 3071 uint32_t tsn; 3072 struct sctp_tmit_chunk *tp1; 3073 3074 tsn = ntohl(desc->tsn_ifany); 3075 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3076 if (tp1->rec.data.tsn == tsn) { 3077 /* found it */ 3078 break; 3079 } 3080 if (SCTP_TSN_GT(tp1->rec.data.tsn, tsn)) { 3081 /* not found */ 3082 tp1 = NULL; 3083 break; 3084 } 3085 } 3086 if (tp1 == NULL) { 3087 /* 3088 * Do it the other way , aka without paying 3089 * attention to queue seq order. 3090 */ 3091 SCTP_STAT_INCR(sctps_pdrpdnfnd); 3092 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3093 if (tp1->rec.data.tsn == tsn) { 3094 /* found it */ 3095 break; 3096 } 3097 } 3098 } 3099 if (tp1 == NULL) { 3100 SCTP_STAT_INCR(sctps_pdrptsnnf); 3101 } 3102 if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) { 3103 if (((flg & SCTP_BADCRC) == 0) && 3104 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3105 return (0); 3106 } 3107 if ((stcb->asoc.peers_rwnd == 0) && 3108 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3109 SCTP_STAT_INCR(sctps_pdrpdiwnp); 3110 return (0); 3111 } 3112 if (stcb->asoc.peers_rwnd == 0 && 3113 (flg & SCTP_FROM_MIDDLE_BOX)) { 3114 SCTP_STAT_INCR(sctps_pdrpdizrw); 3115 return (0); 3116 } 3117 if ((uint32_t)SCTP_BUF_LEN(tp1->data) < 3118 SCTP_DATA_CHUNK_OVERHEAD(stcb) + SCTP_NUM_DB_TO_VERIFY) { 3119 /* Payload not matching. */ 3120 SCTP_STAT_INCR(sctps_pdrpbadd); 3121 return (-1); 3122 } 3123 if (memcmp(mtod(tp1->data, caddr_t)+SCTP_DATA_CHUNK_OVERHEAD(stcb), 3124 desc->data_bytes, SCTP_NUM_DB_TO_VERIFY) != 0) { 3125 /* Payload not matching. */ 3126 SCTP_STAT_INCR(sctps_pdrpbadd); 3127 return (-1); 3128 } 3129 if (tp1->do_rtt) { 3130 /* 3131 * this guy had a RTO calculation 3132 * pending on it, cancel it 3133 */ 3134 if (tp1->whoTo->rto_needed == 0) { 3135 tp1->whoTo->rto_needed = 1; 3136 } 3137 tp1->do_rtt = 0; 3138 } 3139 SCTP_STAT_INCR(sctps_pdrpmark); 3140 if (tp1->sent != SCTP_DATAGRAM_RESEND) 3141 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3142 /* 3143 * mark it as if we were doing a FR, since 3144 * we will be getting gap ack reports behind 3145 * the info from the router. 3146 */ 3147 tp1->rec.data.doing_fast_retransmit = 1; 3148 /* 3149 * mark the tsn with what sequences can 3150 * cause a new FR. 3151 */ 3152 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) { 3153 tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq; 3154 } else { 3155 tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.tsn; 3156 } 3157 3158 /* restart the timer */ 3159 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3160 stcb, tp1->whoTo, 3161 SCTP_FROM_SCTP_INPUT + SCTP_LOC_26); 3162 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3163 stcb, tp1->whoTo); 3164 3165 /* fix counts and things */ 3166 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 3167 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP, 3168 tp1->whoTo->flight_size, 3169 tp1->book_size, 3170 (uint32_t)(uintptr_t)stcb, 3171 tp1->rec.data.tsn); 3172 } 3173 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3174 sctp_flight_size_decrease(tp1); 3175 sctp_total_flight_decrease(stcb, tp1); 3176 } 3177 tp1->sent = SCTP_DATAGRAM_RESEND; 3178 } { 3179 /* audit code */ 3180 unsigned int audit; 3181 3182 audit = 0; 3183 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3184 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3185 audit++; 3186 } 3187 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue, 3188 sctp_next) { 3189 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3190 audit++; 3191 } 3192 if (audit != stcb->asoc.sent_queue_retran_cnt) { 3193 SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n", 3194 audit, stcb->asoc.sent_queue_retran_cnt); 3195 #ifndef SCTP_AUDITING_ENABLED 3196 stcb->asoc.sent_queue_retran_cnt = audit; 3197 #endif 3198 } 3199 } 3200 } 3201 break; 3202 case SCTP_ASCONF: 3203 { 3204 struct sctp_tmit_chunk *asconf; 3205 3206 TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue, 3207 sctp_next) { 3208 if (asconf->rec.chunk_id.id == SCTP_ASCONF) { 3209 break; 3210 } 3211 } 3212 if (asconf) { 3213 if (asconf->sent != SCTP_DATAGRAM_RESEND) 3214 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3215 asconf->sent = SCTP_DATAGRAM_RESEND; 3216 asconf->snd_count--; 3217 } 3218 } 3219 break; 3220 case SCTP_INITIATION: 3221 /* resend the INIT */ 3222 stcb->asoc.dropped_special_cnt++; 3223 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) { 3224 /* 3225 * If we can get it in, in a few attempts we do 3226 * this, otherwise we let the timer fire. 3227 */ 3228 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, 3229 stcb, net, 3230 SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 3231 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 3232 } 3233 break; 3234 case SCTP_SELECTIVE_ACK: 3235 case SCTP_NR_SELECTIVE_ACK: 3236 /* resend the sack */ 3237 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED); 3238 break; 3239 case SCTP_HEARTBEAT_REQUEST: 3240 /* resend a demand HB */ 3241 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) { 3242 /* 3243 * Only retransmit if we KNOW we wont destroy the 3244 * tcb 3245 */ 3246 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 3247 } 3248 break; 3249 case SCTP_SHUTDOWN: 3250 sctp_send_shutdown(stcb, net); 3251 break; 3252 case SCTP_SHUTDOWN_ACK: 3253 sctp_send_shutdown_ack(stcb, net); 3254 break; 3255 case SCTP_COOKIE_ECHO: 3256 { 3257 struct sctp_tmit_chunk *cookie; 3258 3259 cookie = NULL; 3260 TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, 3261 sctp_next) { 3262 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) { 3263 break; 3264 } 3265 } 3266 if (cookie) { 3267 if (cookie->sent != SCTP_DATAGRAM_RESEND) 3268 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3269 cookie->sent = SCTP_DATAGRAM_RESEND; 3270 sctp_stop_all_cookie_timers(stcb); 3271 } 3272 } 3273 break; 3274 case SCTP_COOKIE_ACK: 3275 sctp_send_cookie_ack(stcb); 3276 break; 3277 case SCTP_ASCONF_ACK: 3278 /* resend last asconf ack */ 3279 sctp_send_asconf_ack(stcb); 3280 break; 3281 case SCTP_IFORWARD_CUM_TSN: 3282 case SCTP_FORWARD_CUM_TSN: 3283 send_forward_tsn(stcb, &stcb->asoc); 3284 break; 3285 /* can't do anything with these */ 3286 case SCTP_PACKET_DROPPED: 3287 case SCTP_INITIATION_ACK: /* this should not happen */ 3288 case SCTP_HEARTBEAT_ACK: 3289 case SCTP_ABORT_ASSOCIATION: 3290 case SCTP_OPERATION_ERROR: 3291 case SCTP_SHUTDOWN_COMPLETE: 3292 case SCTP_ECN_ECHO: 3293 case SCTP_ECN_CWR: 3294 default: 3295 break; 3296 } 3297 return (0); 3298 } 3299 3300 void 3301 sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list) 3302 { 3303 uint32_t i; 3304 uint16_t temp; 3305 3306 /* 3307 * We set things to 0xffffffff since this is the last delivered 3308 * sequence and we will be sending in 0 after the reset. 3309 */ 3310 3311 if (number_entries) { 3312 for (i = 0; i < number_entries; i++) { 3313 temp = ntohs(list[i]); 3314 if (temp >= stcb->asoc.streamincnt) { 3315 continue; 3316 } 3317 stcb->asoc.strmin[temp].last_mid_delivered = 0xffffffff; 3318 } 3319 } else { 3320 list = NULL; 3321 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3322 stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff; 3323 } 3324 } 3325 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3326 } 3327 3328 static void 3329 sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list) 3330 { 3331 uint32_t i; 3332 uint16_t temp; 3333 3334 if (number_entries > 0) { 3335 for (i = 0; i < number_entries; i++) { 3336 temp = ntohs(list[i]); 3337 if (temp >= stcb->asoc.streamoutcnt) { 3338 /* no such stream */ 3339 continue; 3340 } 3341 stcb->asoc.strmout[temp].next_mid_ordered = 0; 3342 stcb->asoc.strmout[temp].next_mid_unordered = 0; 3343 } 3344 } else { 3345 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3346 stcb->asoc.strmout[i].next_mid_ordered = 0; 3347 stcb->asoc.strmout[i].next_mid_unordered = 0; 3348 } 3349 } 3350 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3351 } 3352 3353 static void 3354 sctp_reset_clear_pending(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list) 3355 { 3356 uint32_t i; 3357 uint16_t temp; 3358 3359 if (number_entries > 0) { 3360 for (i = 0; i < number_entries; i++) { 3361 temp = ntohs(list[i]); 3362 if (temp >= stcb->asoc.streamoutcnt) { 3363 /* no such stream */ 3364 continue; 3365 } 3366 stcb->asoc.strmout[temp].state = SCTP_STREAM_OPEN; 3367 } 3368 } else { 3369 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3370 stcb->asoc.strmout[i].state = SCTP_STREAM_OPEN; 3371 } 3372 } 3373 } 3374 3375 struct sctp_stream_reset_request * 3376 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk) 3377 { 3378 struct sctp_association *asoc; 3379 struct sctp_chunkhdr *ch; 3380 struct sctp_stream_reset_request *r; 3381 struct sctp_tmit_chunk *chk; 3382 int len, clen; 3383 3384 asoc = &stcb->asoc; 3385 chk = asoc->str_reset; 3386 if (TAILQ_EMPTY(&asoc->control_send_queue) || 3387 (chk == NULL)) { 3388 asoc->stream_reset_outstanding = 0; 3389 return (NULL); 3390 } 3391 if (chk->data == NULL) { 3392 return (NULL); 3393 } 3394 if (bchk != NULL) { 3395 /* he wants a copy of the chk pointer */ 3396 *bchk = chk; 3397 } 3398 clen = chk->send_size; 3399 ch = mtod(chk->data, struct sctp_chunkhdr *); 3400 r = (struct sctp_stream_reset_request *)(ch + 1); 3401 if (ntohl(r->request_seq) == seq) { 3402 /* found it */ 3403 return (r); 3404 } 3405 len = SCTP_SIZE32(ntohs(r->ph.param_length)); 3406 if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) { 3407 /* move to the next one, there can only be a max of two */ 3408 r = (struct sctp_stream_reset_request *)((caddr_t)r + len); 3409 if (ntohl(r->request_seq) == seq) { 3410 return (r); 3411 } 3412 } 3413 /* that seq is not here */ 3414 return (NULL); 3415 } 3416 3417 static void 3418 sctp_clean_up_stream_reset(struct sctp_tcb *stcb) 3419 { 3420 struct sctp_association *asoc; 3421 struct sctp_tmit_chunk *chk; 3422 3423 asoc = &stcb->asoc; 3424 chk = asoc->str_reset; 3425 if (chk == NULL) { 3426 return; 3427 } 3428 asoc->str_reset = NULL; 3429 sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, 3430 NULL, SCTP_FROM_SCTP_INPUT + SCTP_LOC_28); 3431 TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next); 3432 asoc->ctrl_queue_cnt--; 3433 if (chk->data) { 3434 sctp_m_freem(chk->data); 3435 chk->data = NULL; 3436 } 3437 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3438 } 3439 3440 static int 3441 sctp_handle_stream_reset_response(struct sctp_tcb *stcb, 3442 uint32_t seq, uint32_t action, 3443 struct sctp_stream_reset_response *respin) 3444 { 3445 uint16_t type; 3446 int lparam_len; 3447 struct sctp_association *asoc = &stcb->asoc; 3448 struct sctp_tmit_chunk *chk; 3449 struct sctp_stream_reset_request *req_param; 3450 struct sctp_stream_reset_out_request *req_out_param; 3451 struct sctp_stream_reset_in_request *req_in_param; 3452 uint32_t number_entries; 3453 3454 if (asoc->stream_reset_outstanding == 0) { 3455 /* duplicate */ 3456 return (0); 3457 } 3458 if (seq == stcb->asoc.str_reset_seq_out) { 3459 req_param = sctp_find_stream_reset(stcb, seq, &chk); 3460 if (req_param != NULL) { 3461 stcb->asoc.str_reset_seq_out++; 3462 type = ntohs(req_param->ph.param_type); 3463 lparam_len = ntohs(req_param->ph.param_length); 3464 if (type == SCTP_STR_RESET_OUT_REQUEST) { 3465 int no_clear = 0; 3466 3467 req_out_param = (struct sctp_stream_reset_out_request *)req_param; 3468 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t); 3469 asoc->stream_reset_out_is_outstanding = 0; 3470 if (asoc->stream_reset_outstanding) 3471 asoc->stream_reset_outstanding--; 3472 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3473 /* do it */ 3474 sctp_reset_out_streams(stcb, number_entries, req_out_param->list_of_streams); 3475 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3476 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3477 } else if (action == SCTP_STREAM_RESET_RESULT_IN_PROGRESS) { 3478 /* 3479 * Set it up so we don't stop 3480 * retransmitting 3481 */ 3482 asoc->stream_reset_outstanding++; 3483 stcb->asoc.str_reset_seq_out--; 3484 asoc->stream_reset_out_is_outstanding = 1; 3485 no_clear = 1; 3486 } else { 3487 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3488 } 3489 if (no_clear == 0) { 3490 sctp_reset_clear_pending(stcb, number_entries, req_out_param->list_of_streams); 3491 } 3492 } else if (type == SCTP_STR_RESET_IN_REQUEST) { 3493 req_in_param = (struct sctp_stream_reset_in_request *)req_param; 3494 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t); 3495 if (asoc->stream_reset_outstanding) 3496 asoc->stream_reset_outstanding--; 3497 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3498 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb, 3499 number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3500 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3501 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb, 3502 number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3503 } 3504 } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) { 3505 /* Ok we now may have more streams */ 3506 int num_stream; 3507 3508 num_stream = stcb->asoc.strm_pending_add_size; 3509 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) { 3510 /* TSNH */ 3511 num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt; 3512 } 3513 stcb->asoc.strm_pending_add_size = 0; 3514 if (asoc->stream_reset_outstanding) 3515 asoc->stream_reset_outstanding--; 3516 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3517 /* Put the new streams into effect */ 3518 int i; 3519 3520 for (i = asoc->streamoutcnt; i < (asoc->streamoutcnt + num_stream); i++) { 3521 asoc->strmout[i].state = SCTP_STREAM_OPEN; 3522 } 3523 asoc->streamoutcnt += num_stream; 3524 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 3525 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3526 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3527 SCTP_STREAM_CHANGE_DENIED); 3528 } else { 3529 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3530 SCTP_STREAM_CHANGE_FAILED); 3531 } 3532 } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) { 3533 if (asoc->stream_reset_outstanding) 3534 asoc->stream_reset_outstanding--; 3535 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3536 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3537 SCTP_STREAM_CHANGE_DENIED); 3538 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3539 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3540 SCTP_STREAM_CHANGE_FAILED); 3541 } 3542 } else if (type == SCTP_STR_RESET_TSN_REQUEST) { 3543 /** 3544 * a) Adopt the new in tsn. 3545 * b) reset the map 3546 * c) Adopt the new out-tsn 3547 */ 3548 struct sctp_stream_reset_response_tsn *resp; 3549 struct sctp_forward_tsn_chunk fwdtsn; 3550 int abort_flag = 0; 3551 3552 if (respin == NULL) { 3553 /* huh ? */ 3554 return (0); 3555 } 3556 if (ntohs(respin->ph.param_length) < sizeof(struct sctp_stream_reset_response_tsn)) { 3557 return (0); 3558 } 3559 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3560 resp = (struct sctp_stream_reset_response_tsn *)respin; 3561 asoc->stream_reset_outstanding--; 3562 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3563 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3564 fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1); 3565 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3566 if (abort_flag) { 3567 return (1); 3568 } 3569 stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1); 3570 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3571 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3572 } 3573 3574 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 3575 stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn); 3576 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 3577 3578 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map; 3579 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size); 3580 3581 stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn); 3582 stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn; 3583 3584 sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL); 3585 sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL); 3586 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0); 3587 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3588 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3589 SCTP_ASSOC_RESET_DENIED); 3590 } else { 3591 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3592 SCTP_ASSOC_RESET_FAILED); 3593 } 3594 } 3595 /* get rid of the request and get the request flags */ 3596 if (asoc->stream_reset_outstanding == 0) { 3597 sctp_clean_up_stream_reset(stcb); 3598 } 3599 } 3600 } 3601 if (asoc->stream_reset_outstanding == 0) { 3602 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED); 3603 } 3604 return (0); 3605 } 3606 3607 static void 3608 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb, 3609 struct sctp_tmit_chunk *chk, 3610 struct sctp_stream_reset_in_request *req, int trunc) 3611 { 3612 uint32_t seq; 3613 int len, i; 3614 int number_entries; 3615 uint16_t temp; 3616 3617 /* 3618 * peer wants me to send a str-reset to him for my outgoing seq's if 3619 * seq_in is right. 3620 */ 3621 struct sctp_association *asoc = &stcb->asoc; 3622 3623 seq = ntohl(req->request_seq); 3624 if (asoc->str_reset_seq_in == seq) { 3625 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3626 if ((asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ) == 0) { 3627 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3628 } else if (trunc) { 3629 /* Can't do it, since they exceeded our buffer size */ 3630 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3631 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) { 3632 len = ntohs(req->ph.param_length); 3633 number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t)); 3634 if (number_entries) { 3635 for (i = 0; i < number_entries; i++) { 3636 temp = ntohs(req->list_of_streams[i]); 3637 if (temp >= stcb->asoc.streamoutcnt) { 3638 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3639 goto bad_boy; 3640 } 3641 req->list_of_streams[i] = temp; 3642 } 3643 for (i = 0; i < number_entries; i++) { 3644 if (stcb->asoc.strmout[req->list_of_streams[i]].state == SCTP_STREAM_OPEN) { 3645 stcb->asoc.strmout[req->list_of_streams[i]].state = SCTP_STREAM_RESET_PENDING; 3646 } 3647 } 3648 } else { 3649 /* Its all */ 3650 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3651 if (stcb->asoc.strmout[i].state == SCTP_STREAM_OPEN) 3652 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_PENDING; 3653 } 3654 } 3655 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3656 } else { 3657 /* Can't do it, since we have sent one out */ 3658 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 3659 } 3660 bad_boy: 3661 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3662 asoc->str_reset_seq_in++; 3663 } else if (asoc->str_reset_seq_in - 1 == seq) { 3664 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3665 } else if (asoc->str_reset_seq_in - 2 == seq) { 3666 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3667 } else { 3668 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3669 } 3670 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED); 3671 } 3672 3673 static int 3674 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb, 3675 struct sctp_tmit_chunk *chk, 3676 struct sctp_stream_reset_tsn_request *req) 3677 { 3678 /* reset all in and out and update the tsn */ 3679 /* 3680 * A) reset my str-seq's on in and out. B) Select a receive next, 3681 * and set cum-ack to it. Also process this selected number as a 3682 * fwd-tsn as well. C) set in the response my next sending seq. 3683 */ 3684 struct sctp_forward_tsn_chunk fwdtsn; 3685 struct sctp_association *asoc = &stcb->asoc; 3686 int abort_flag = 0; 3687 uint32_t seq; 3688 3689 seq = ntohl(req->request_seq); 3690 if (asoc->str_reset_seq_in == seq) { 3691 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3692 if ((asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ) == 0) { 3693 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3694 } else { 3695 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3696 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3697 fwdtsn.ch.chunk_flags = 0; 3698 fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1); 3699 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3700 if (abort_flag) { 3701 return (1); 3702 } 3703 asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA; 3704 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3705 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3706 } 3707 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map; 3708 asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1; 3709 memset(asoc->mapping_array, 0, asoc->mapping_array_size); 3710 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 3711 memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size); 3712 atomic_add_int(&asoc->sending_seq, 1); 3713 /* save off historical data for retrans */ 3714 asoc->last_sending_seq[1] = asoc->last_sending_seq[0]; 3715 asoc->last_sending_seq[0] = asoc->sending_seq; 3716 asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0]; 3717 asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn; 3718 sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL); 3719 sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL); 3720 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3721 sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0); 3722 } 3723 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3724 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3725 asoc->str_reset_seq_in++; 3726 } else if (asoc->str_reset_seq_in - 1 == seq) { 3727 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3728 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3729 } else if (asoc->str_reset_seq_in - 2 == seq) { 3730 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1], 3731 asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]); 3732 } else { 3733 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3734 } 3735 return (0); 3736 } 3737 3738 static void 3739 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb, 3740 struct sctp_tmit_chunk *chk, 3741 struct sctp_stream_reset_out_request *req, int trunc) 3742 { 3743 uint32_t seq, tsn; 3744 int number_entries, len; 3745 struct sctp_association *asoc = &stcb->asoc; 3746 3747 seq = ntohl(req->request_seq); 3748 3749 /* now if its not a duplicate we process it */ 3750 if (asoc->str_reset_seq_in == seq) { 3751 len = ntohs(req->ph.param_length); 3752 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t)); 3753 /* 3754 * the sender is resetting, handle the list issue.. we must 3755 * a) verify if we can do the reset, if so no problem b) If 3756 * we can't do the reset we must copy the request. c) queue 3757 * it, and setup the data in processor to trigger it off 3758 * when needed and dequeue all the queued data. 3759 */ 3760 tsn = ntohl(req->send_reset_at_tsn); 3761 3762 /* move the reset action back one */ 3763 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3764 if ((asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ) == 0) { 3765 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3766 } else if (trunc) { 3767 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3768 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) { 3769 /* we can do it now */ 3770 sctp_reset_in_stream(stcb, number_entries, req->list_of_streams); 3771 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3772 } else { 3773 /* 3774 * we must queue it up and thus wait for the TSN's 3775 * to arrive that are at or before tsn 3776 */ 3777 struct sctp_stream_reset_list *liste; 3778 int siz; 3779 3780 siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t)); 3781 SCTP_MALLOC(liste, struct sctp_stream_reset_list *, 3782 siz, SCTP_M_STRESET); 3783 if (liste == NULL) { 3784 /* gak out of memory */ 3785 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3786 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3787 return; 3788 } 3789 liste->seq = seq; 3790 liste->tsn = tsn; 3791 liste->number_entries = number_entries; 3792 memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t)); 3793 TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp); 3794 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_IN_PROGRESS; 3795 } 3796 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3797 asoc->str_reset_seq_in++; 3798 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3799 /* 3800 * one seq back, just echo back last action since my 3801 * response was lost. 3802 */ 3803 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3804 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3805 /* 3806 * two seq back, just echo back last action since my 3807 * response was lost. 3808 */ 3809 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3810 } else { 3811 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3812 } 3813 } 3814 3815 static void 3816 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 3817 struct sctp_stream_reset_add_strm *str_add) 3818 { 3819 /* 3820 * Peer is requesting to add more streams. If its within our 3821 * max-streams we will allow it. 3822 */ 3823 uint32_t num_stream, i; 3824 uint32_t seq; 3825 struct sctp_association *asoc = &stcb->asoc; 3826 struct sctp_queued_to_read *ctl, *nctl; 3827 3828 /* Get the number. */ 3829 seq = ntohl(str_add->request_seq); 3830 num_stream = ntohs(str_add->number_of_streams); 3831 /* Now what would be the new total? */ 3832 if (asoc->str_reset_seq_in == seq) { 3833 num_stream += stcb->asoc.streamincnt; 3834 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3835 if ((asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ) == 0) { 3836 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3837 } else if ((num_stream > stcb->asoc.max_inbound_streams) || 3838 (num_stream > 0xffff)) { 3839 /* We must reject it they ask for to many */ 3840 denied: 3841 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3842 } else { 3843 /* Ok, we can do that :-) */ 3844 struct sctp_stream_in *oldstrm; 3845 3846 /* save off the old */ 3847 oldstrm = stcb->asoc.strmin; 3848 SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *, 3849 (num_stream * sizeof(struct sctp_stream_in)), 3850 SCTP_M_STRMI); 3851 if (stcb->asoc.strmin == NULL) { 3852 stcb->asoc.strmin = oldstrm; 3853 goto denied; 3854 } 3855 /* copy off the old data */ 3856 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3857 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 3858 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue); 3859 stcb->asoc.strmin[i].sid = i; 3860 stcb->asoc.strmin[i].last_mid_delivered = oldstrm[i].last_mid_delivered; 3861 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started; 3862 stcb->asoc.strmin[i].pd_api_started = oldstrm[i].pd_api_started; 3863 /* now anything on those queues? */ 3864 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next_instrm, nctl) { 3865 TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next_instrm); 3866 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next_instrm); 3867 } 3868 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].uno_inqueue, next_instrm, nctl) { 3869 TAILQ_REMOVE(&oldstrm[i].uno_inqueue, ctl, next_instrm); 3870 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].uno_inqueue, ctl, next_instrm); 3871 } 3872 } 3873 /* Init the new streams */ 3874 for (i = stcb->asoc.streamincnt; i < num_stream; i++) { 3875 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 3876 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue); 3877 stcb->asoc.strmin[i].sid = i; 3878 stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff; 3879 stcb->asoc.strmin[i].pd_api_started = 0; 3880 stcb->asoc.strmin[i].delivery_started = 0; 3881 } 3882 SCTP_FREE(oldstrm, SCTP_M_STRMI); 3883 /* update the size */ 3884 stcb->asoc.streamincnt = num_stream; 3885 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3886 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 3887 } 3888 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3889 asoc->str_reset_seq_in++; 3890 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3891 /* 3892 * one seq back, just echo back last action since my 3893 * response was lost. 3894 */ 3895 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3896 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3897 /* 3898 * two seq back, just echo back last action since my 3899 * response was lost. 3900 */ 3901 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3902 } else { 3903 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3904 } 3905 } 3906 3907 static void 3908 sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 3909 struct sctp_stream_reset_add_strm *str_add) 3910 { 3911 /* 3912 * Peer is requesting to add more streams. If its within our 3913 * max-streams we will allow it. 3914 */ 3915 uint16_t num_stream; 3916 uint32_t seq; 3917 struct sctp_association *asoc = &stcb->asoc; 3918 3919 /* Get the number. */ 3920 seq = ntohl(str_add->request_seq); 3921 num_stream = ntohs(str_add->number_of_streams); 3922 /* Now what would be the new total? */ 3923 if (asoc->str_reset_seq_in == seq) { 3924 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3925 if ((asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ) == 0) { 3926 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3927 } else if (stcb->asoc.stream_reset_outstanding) { 3928 /* We must reject it we have something pending */ 3929 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 3930 } else { 3931 /* Ok, we can do that :-) */ 3932 int mychk; 3933 3934 mychk = stcb->asoc.streamoutcnt; 3935 mychk += num_stream; 3936 if (mychk < 0x10000) { 3937 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3938 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 1, num_stream, 0, 1)) { 3939 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3940 } 3941 } else { 3942 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3943 } 3944 } 3945 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]); 3946 asoc->str_reset_seq_in++; 3947 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3948 /* 3949 * one seq back, just echo back last action since my 3950 * response was lost. 3951 */ 3952 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3953 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3954 /* 3955 * two seq back, just echo back last action since my 3956 * response was lost. 3957 */ 3958 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3959 } else { 3960 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3961 } 3962 } 3963 3964 #ifdef __GNUC__ 3965 __attribute__((noinline)) 3966 #endif 3967 static int 3968 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset, 3969 struct sctp_chunkhdr *ch_req) 3970 { 3971 uint16_t remaining_length, param_len, ptype; 3972 struct sctp_paramhdr pstore; 3973 uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE]; 3974 uint32_t seq = 0; 3975 int num_req = 0; 3976 int trunc = 0; 3977 struct sctp_tmit_chunk *chk; 3978 struct sctp_chunkhdr *ch; 3979 struct sctp_paramhdr *ph; 3980 int ret_code = 0; 3981 int num_param = 0; 3982 3983 /* now it may be a reset or a reset-response */ 3984 remaining_length = ntohs(ch_req->chunk_length) - sizeof(struct sctp_chunkhdr); 3985 3986 /* setup for adding the response */ 3987 sctp_alloc_a_chunk(stcb, chk); 3988 if (chk == NULL) { 3989 return (ret_code); 3990 } 3991 chk->copy_by_ref = 0; 3992 chk->rec.chunk_id.id = SCTP_STREAM_RESET; 3993 chk->rec.chunk_id.can_take_data = 0; 3994 chk->flags = 0; 3995 chk->asoc = &stcb->asoc; 3996 chk->no_fr_allowed = 0; 3997 chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr); 3998 chk->book_size_scale = 0; 3999 chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA); 4000 if (chk->data == NULL) { 4001 strres_nochunk: 4002 if (chk->data) { 4003 sctp_m_freem(chk->data); 4004 chk->data = NULL; 4005 } 4006 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 4007 return (ret_code); 4008 } 4009 SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD); 4010 4011 /* setup chunk parameters */ 4012 chk->sent = SCTP_DATAGRAM_UNSENT; 4013 chk->snd_count = 0; 4014 chk->whoTo = NULL; 4015 4016 ch = mtod(chk->data, struct sctp_chunkhdr *); 4017 ch->chunk_type = SCTP_STREAM_RESET; 4018 ch->chunk_flags = 0; 4019 ch->chunk_length = htons(chk->send_size); 4020 SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size); 4021 offset += sizeof(struct sctp_chunkhdr); 4022 while (remaining_length >= sizeof(struct sctp_paramhdr)) { 4023 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *)&pstore); 4024 if (ph == NULL) { 4025 /* TSNH */ 4026 break; 4027 } 4028 param_len = ntohs(ph->param_length); 4029 if ((param_len > remaining_length) || 4030 (param_len < (sizeof(struct sctp_paramhdr) + sizeof(uint32_t)))) { 4031 /* bad parameter length */ 4032 break; 4033 } 4034 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, sizeof(cstore)), 4035 (uint8_t *)&cstore); 4036 if (ph == NULL) { 4037 /* TSNH */ 4038 break; 4039 } 4040 ptype = ntohs(ph->param_type); 4041 num_param++; 4042 if (param_len > sizeof(cstore)) { 4043 trunc = 1; 4044 } else { 4045 trunc = 0; 4046 } 4047 if (num_param > SCTP_MAX_RESET_PARAMS) { 4048 /* hit the max of parameters already sorry.. */ 4049 break; 4050 } 4051 if (ptype == SCTP_STR_RESET_OUT_REQUEST) { 4052 struct sctp_stream_reset_out_request *req_out; 4053 4054 if (param_len < sizeof(struct sctp_stream_reset_out_request)) { 4055 break; 4056 } 4057 req_out = (struct sctp_stream_reset_out_request *)ph; 4058 num_req++; 4059 if (stcb->asoc.stream_reset_outstanding) { 4060 seq = ntohl(req_out->response_seq); 4061 if (seq == stcb->asoc.str_reset_seq_out) { 4062 /* implicit ack */ 4063 (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL); 4064 } 4065 } 4066 sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc); 4067 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) { 4068 struct sctp_stream_reset_add_strm *str_add; 4069 4070 if (param_len < sizeof(struct sctp_stream_reset_add_strm)) { 4071 break; 4072 } 4073 str_add = (struct sctp_stream_reset_add_strm *)ph; 4074 num_req++; 4075 sctp_handle_str_reset_add_strm(stcb, chk, str_add); 4076 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) { 4077 struct sctp_stream_reset_add_strm *str_add; 4078 4079 if (param_len < sizeof(struct sctp_stream_reset_add_strm)) { 4080 break; 4081 } 4082 str_add = (struct sctp_stream_reset_add_strm *)ph; 4083 num_req++; 4084 sctp_handle_str_reset_add_out_strm(stcb, chk, str_add); 4085 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) { 4086 struct sctp_stream_reset_in_request *req_in; 4087 4088 num_req++; 4089 req_in = (struct sctp_stream_reset_in_request *)ph; 4090 sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc); 4091 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) { 4092 struct sctp_stream_reset_tsn_request *req_tsn; 4093 4094 num_req++; 4095 req_tsn = (struct sctp_stream_reset_tsn_request *)ph; 4096 if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) { 4097 ret_code = 1; 4098 goto strres_nochunk; 4099 } 4100 /* no more */ 4101 break; 4102 } else if (ptype == SCTP_STR_RESET_RESPONSE) { 4103 struct sctp_stream_reset_response *resp; 4104 uint32_t result; 4105 4106 if (param_len < sizeof(struct sctp_stream_reset_response)) { 4107 break; 4108 } 4109 resp = (struct sctp_stream_reset_response *)ph; 4110 seq = ntohl(resp->response_seq); 4111 result = ntohl(resp->result); 4112 if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) { 4113 ret_code = 1; 4114 goto strres_nochunk; 4115 } 4116 } else { 4117 break; 4118 } 4119 offset += SCTP_SIZE32(param_len); 4120 if (remaining_length >= SCTP_SIZE32(param_len)) { 4121 remaining_length -= SCTP_SIZE32(param_len); 4122 } else { 4123 remaining_length = 0; 4124 } 4125 } 4126 if (num_req == 0) { 4127 /* we have no response free the stuff */ 4128 goto strres_nochunk; 4129 } 4130 /* ok we have a chunk to link in */ 4131 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, 4132 chk, 4133 sctp_next); 4134 stcb->asoc.ctrl_queue_cnt++; 4135 return (ret_code); 4136 } 4137 4138 /* 4139 * Handle a router or endpoints report of a packet loss, there are two ways 4140 * to handle this, either we get the whole packet and must disect it 4141 * ourselves (possibly with truncation and or corruption) or it is a summary 4142 * from a middle box that did the disecting for us. 4143 */ 4144 static void 4145 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp, 4146 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 4147 { 4148 struct sctp_chunk_desc desc; 4149 struct sctp_chunkhdr *chk_hdr; 4150 struct sctp_data_chunk *data_chunk; 4151 struct sctp_idata_chunk *idata_chunk; 4152 uint32_t bottle_bw, on_queue; 4153 uint32_t offset, chk_len; 4154 uint16_t pktdrp_len; 4155 uint8_t pktdrp_flags; 4156 4157 KASSERT(sizeof(struct sctp_pktdrop_chunk) <= limit, 4158 ("PKTDROP chunk too small")); 4159 pktdrp_flags = cp->ch.chunk_flags; 4160 pktdrp_len = ntohs(cp->ch.chunk_length); 4161 KASSERT(limit <= pktdrp_len, ("Inconsistent limit")); 4162 if (pktdrp_flags & SCTP_PACKET_TRUNCATED) { 4163 if (ntohs(cp->trunc_len) <= pktdrp_len - sizeof(struct sctp_pktdrop_chunk)) { 4164 /* The peer plays games with us. */ 4165 return; 4166 } 4167 } 4168 limit -= sizeof(struct sctp_pktdrop_chunk); 4169 offset = 0; 4170 if (offset == limit) { 4171 if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) { 4172 SCTP_STAT_INCR(sctps_pdrpbwrpt); 4173 } 4174 } else if (offset + sizeof(struct sctphdr) > limit) { 4175 /* Only a partial SCTP common header. */ 4176 SCTP_STAT_INCR(sctps_pdrpcrupt); 4177 offset = limit; 4178 } else { 4179 /* XXX: Check embedded SCTP common header. */ 4180 offset += sizeof(struct sctphdr); 4181 } 4182 /* Now parse through the chunks themselves. */ 4183 while (offset < limit) { 4184 if (offset + sizeof(struct sctp_chunkhdr) > limit) { 4185 SCTP_STAT_INCR(sctps_pdrpcrupt); 4186 break; 4187 } 4188 chk_hdr = (struct sctp_chunkhdr *)(cp->data + offset); 4189 desc.chunk_type = chk_hdr->chunk_type; 4190 /* get amount we need to move */ 4191 chk_len = (uint32_t)ntohs(chk_hdr->chunk_length); 4192 if (chk_len < sizeof(struct sctp_chunkhdr)) { 4193 /* Someone is lying... */ 4194 break; 4195 } 4196 if (desc.chunk_type == SCTP_DATA) { 4197 if (stcb->asoc.idata_supported) { 4198 /* Some is playing games with us. */ 4199 break; 4200 } 4201 if (chk_len <= sizeof(struct sctp_data_chunk)) { 4202 /* Some is playing games with us. */ 4203 break; 4204 } 4205 if (chk_len < sizeof(struct sctp_data_chunk) + SCTP_NUM_DB_TO_VERIFY) { 4206 /* 4207 * Not enough data bytes available in the 4208 * chunk. 4209 */ 4210 SCTP_STAT_INCR(sctps_pdrpnedat); 4211 goto next_chunk; 4212 } 4213 if (offset + sizeof(struct sctp_data_chunk) + SCTP_NUM_DB_TO_VERIFY > limit) { 4214 /* Not enough data in buffer. */ 4215 break; 4216 } 4217 data_chunk = (struct sctp_data_chunk *)(cp->data + offset); 4218 memcpy(desc.data_bytes, data_chunk + 1, SCTP_NUM_DB_TO_VERIFY); 4219 desc.tsn_ifany = data_chunk->dp.tsn; 4220 if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) { 4221 SCTP_STAT_INCR(sctps_pdrpmbda); 4222 } 4223 } else if (desc.chunk_type == SCTP_IDATA) { 4224 if (!stcb->asoc.idata_supported) { 4225 /* Some is playing games with us. */ 4226 break; 4227 } 4228 if (chk_len <= sizeof(struct sctp_idata_chunk)) { 4229 /* Some is playing games with us. */ 4230 break; 4231 } 4232 if (chk_len < sizeof(struct sctp_idata_chunk) + SCTP_NUM_DB_TO_VERIFY) { 4233 /* 4234 * Not enough data bytes available in the 4235 * chunk. 4236 */ 4237 SCTP_STAT_INCR(sctps_pdrpnedat); 4238 goto next_chunk; 4239 } 4240 if (offset + sizeof(struct sctp_idata_chunk) + SCTP_NUM_DB_TO_VERIFY > limit) { 4241 /* Not enough data in buffer. */ 4242 break; 4243 } 4244 idata_chunk = (struct sctp_idata_chunk *)(cp->data + offset); 4245 memcpy(desc.data_bytes, idata_chunk + 1, SCTP_NUM_DB_TO_VERIFY); 4246 desc.tsn_ifany = idata_chunk->dp.tsn; 4247 if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) { 4248 SCTP_STAT_INCR(sctps_pdrpmbda); 4249 } 4250 } else { 4251 if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) { 4252 SCTP_STAT_INCR(sctps_pdrpmbct); 4253 } 4254 } 4255 if (process_chunk_drop(stcb, &desc, net, pktdrp_flags)) { 4256 SCTP_STAT_INCR(sctps_pdrppdbrk); 4257 break; 4258 } 4259 next_chunk: 4260 offset += SCTP_SIZE32(chk_len); 4261 } 4262 /* Now update any rwnd --- possibly */ 4263 if ((pktdrp_flags & SCTP_FROM_MIDDLE_BOX) == 0) { 4264 /* From a peer, we get a rwnd report */ 4265 uint32_t a_rwnd; 4266 4267 SCTP_STAT_INCR(sctps_pdrpfehos); 4268 4269 bottle_bw = ntohl(cp->bottle_bw); 4270 on_queue = ntohl(cp->current_onq); 4271 if (bottle_bw && on_queue) { 4272 /* a rwnd report is in here */ 4273 if (bottle_bw > on_queue) 4274 a_rwnd = bottle_bw - on_queue; 4275 else 4276 a_rwnd = 0; 4277 4278 if (a_rwnd == 0) 4279 stcb->asoc.peers_rwnd = 0; 4280 else { 4281 if (a_rwnd > stcb->asoc.total_flight) { 4282 stcb->asoc.peers_rwnd = 4283 a_rwnd - stcb->asoc.total_flight; 4284 } else { 4285 stcb->asoc.peers_rwnd = 0; 4286 } 4287 if (stcb->asoc.peers_rwnd < 4288 stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 4289 /* SWS sender side engages */ 4290 stcb->asoc.peers_rwnd = 0; 4291 } 4292 } 4293 } 4294 } else { 4295 SCTP_STAT_INCR(sctps_pdrpfmbox); 4296 } 4297 4298 /* now middle boxes in sat networks get a cwnd bump */ 4299 if ((pktdrp_flags & SCTP_FROM_MIDDLE_BOX) && 4300 (stcb->asoc.sat_t3_loss_recovery == 0) && 4301 (stcb->asoc.sat_network)) { 4302 /* 4303 * This is debatable but for sat networks it makes sense 4304 * Note if a T3 timer has went off, we will prohibit any 4305 * changes to cwnd until we exit the t3 loss recovery. 4306 */ 4307 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb, 4308 net, cp, &bottle_bw, &on_queue); 4309 } 4310 } 4311 4312 /* 4313 * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to 4314 * still contain IP/SCTP header - stcb: is the tcb found for this packet - 4315 * offset: offset into the mbuf chain to first chunkhdr - length: is the 4316 * length of the complete packet outputs: - length: modified to remaining 4317 * length after control processing - netp: modified to new sctp_nets after 4318 * cookie-echo processing - return NULL to discard the packet (ie. no asoc, 4319 * bad packet,...) otherwise return the tcb for this packet 4320 */ 4321 #ifdef __GNUC__ 4322 __attribute__((noinline)) 4323 #endif 4324 static struct sctp_tcb * 4325 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length, 4326 struct sockaddr *src, struct sockaddr *dst, 4327 struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp, 4328 struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen, 4329 uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum, 4330 uint32_t vrf_id, uint16_t port) 4331 { 4332 struct sctp_association *asoc; 4333 struct mbuf *op_err; 4334 char msg[SCTP_DIAG_INFO_LEN]; 4335 uint32_t vtag_in; 4336 int num_chunks = 0; /* number of control chunks processed */ 4337 uint32_t chk_length, contiguous; 4338 int ret; 4339 int abort_no_unlock = 0; 4340 int ecne_seen = 0; 4341 int abort_flag; 4342 4343 /* 4344 * How big should this be, and should it be alloc'd? Lets try the 4345 * d-mtu-ceiling for now (2k) and that should hopefully work ... 4346 * until we get into jumbo grams and such.. 4347 */ 4348 uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE]; 4349 int got_auth = 0; 4350 uint32_t auth_offset = 0, auth_len = 0; 4351 int auth_skipped = 0; 4352 int asconf_cnt = 0; 4353 4354 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n", 4355 iphlen, *offset, length, (void *)stcb); 4356 4357 if (stcb) { 4358 SCTP_TCB_LOCK_ASSERT(stcb); 4359 } 4360 /* validate chunk header length... */ 4361 if (ntohs(ch->chunk_length) < sizeof(*ch)) { 4362 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n", 4363 ntohs(ch->chunk_length)); 4364 *offset = length; 4365 return (stcb); 4366 } 4367 /* 4368 * validate the verification tag 4369 */ 4370 vtag_in = ntohl(sh->v_tag); 4371 4372 if (ch->chunk_type == SCTP_INITIATION) { 4373 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n", 4374 ntohs(ch->chunk_length), vtag_in); 4375 if (vtag_in != 0) { 4376 /* protocol error- silently discard... */ 4377 SCTP_STAT_INCR(sctps_badvtag); 4378 if (stcb != NULL) { 4379 SCTP_TCB_UNLOCK(stcb); 4380 } 4381 return (NULL); 4382 } 4383 } else if (ch->chunk_type != SCTP_COOKIE_ECHO) { 4384 /* 4385 * If there is no stcb, skip the AUTH chunk and process 4386 * later after a stcb is found (to validate the lookup was 4387 * valid. 4388 */ 4389 if ((ch->chunk_type == SCTP_AUTHENTICATION) && 4390 (stcb == NULL) && 4391 (inp->auth_supported == 1)) { 4392 /* save this chunk for later processing */ 4393 auth_skipped = 1; 4394 auth_offset = *offset; 4395 auth_len = ntohs(ch->chunk_length); 4396 4397 /* (temporarily) move past this chunk */ 4398 *offset += SCTP_SIZE32(auth_len); 4399 if (*offset >= length) { 4400 /* no more data left in the mbuf chain */ 4401 *offset = length; 4402 return (NULL); 4403 } 4404 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4405 sizeof(struct sctp_chunkhdr), chunk_buf); 4406 } 4407 if (ch == NULL) { 4408 /* Help */ 4409 *offset = length; 4410 return (stcb); 4411 } 4412 if (ch->chunk_type == SCTP_COOKIE_ECHO) { 4413 goto process_control_chunks; 4414 } 4415 /* 4416 * first check if it's an ASCONF with an unknown src addr we 4417 * need to look inside to find the association 4418 */ 4419 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) { 4420 struct sctp_chunkhdr *asconf_ch = ch; 4421 uint32_t asconf_offset = 0, asconf_len = 0; 4422 4423 /* inp's refcount may be reduced */ 4424 SCTP_INP_INCR_REF(inp); 4425 4426 asconf_offset = *offset; 4427 do { 4428 asconf_len = ntohs(asconf_ch->chunk_length); 4429 if (asconf_len < sizeof(struct sctp_asconf_paramhdr)) 4430 break; 4431 stcb = sctp_findassociation_ep_asconf(m, 4432 *offset, 4433 dst, 4434 sh, &inp, netp, vrf_id); 4435 if (stcb != NULL) 4436 break; 4437 asconf_offset += SCTP_SIZE32(asconf_len); 4438 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset, 4439 sizeof(struct sctp_chunkhdr), chunk_buf); 4440 } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF); 4441 if (stcb == NULL) { 4442 /* 4443 * reduce inp's refcount if not reduced in 4444 * sctp_findassociation_ep_asconf(). 4445 */ 4446 SCTP_INP_DECR_REF(inp); 4447 } 4448 4449 /* now go back and verify any auth chunk to be sure */ 4450 if (auth_skipped && (stcb != NULL)) { 4451 struct sctp_auth_chunk *auth; 4452 4453 if (auth_len <= SCTP_CHUNK_BUFFER_SIZE) { 4454 auth = (struct sctp_auth_chunk *)sctp_m_getptr(m, auth_offset, auth_len, chunk_buf); 4455 got_auth = 1; 4456 auth_skipped = 0; 4457 } else { 4458 auth = NULL; 4459 } 4460 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, 4461 auth_offset)) { 4462 /* auth HMAC failed so dump it */ 4463 *offset = length; 4464 return (stcb); 4465 } else { 4466 /* remaining chunks are HMAC checked */ 4467 stcb->asoc.authenticated = 1; 4468 } 4469 } 4470 } 4471 if (stcb == NULL) { 4472 SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 4473 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4474 msg); 4475 /* no association, so it's out of the blue... */ 4476 sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, op_err, 4477 mflowtype, mflowid, inp->fibnum, 4478 vrf_id, port); 4479 *offset = length; 4480 return (NULL); 4481 } 4482 asoc = &stcb->asoc; 4483 /* ABORT and SHUTDOWN can use either v_tag... */ 4484 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) || 4485 (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) || 4486 (ch->chunk_type == SCTP_PACKET_DROPPED)) { 4487 /* Take the T-bit always into account. */ 4488 if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) && 4489 (vtag_in == asoc->my_vtag)) || 4490 (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) && 4491 (asoc->peer_vtag != htonl(0)) && 4492 (vtag_in == asoc->peer_vtag))) { 4493 /* this is valid */ 4494 } else { 4495 /* drop this packet... */ 4496 SCTP_STAT_INCR(sctps_badvtag); 4497 if (stcb != NULL) { 4498 SCTP_TCB_UNLOCK(stcb); 4499 } 4500 return (NULL); 4501 } 4502 } else { 4503 /* for all other chunks, vtag must match */ 4504 if (vtag_in != asoc->my_vtag) { 4505 /* invalid vtag... */ 4506 SCTPDBG(SCTP_DEBUG_INPUT3, 4507 "invalid vtag: %xh, expect %xh\n", 4508 vtag_in, asoc->my_vtag); 4509 SCTP_STAT_INCR(sctps_badvtag); 4510 if (stcb != NULL) { 4511 SCTP_TCB_UNLOCK(stcb); 4512 } 4513 *offset = length; 4514 return (NULL); 4515 } 4516 } 4517 } /* end if !SCTP_COOKIE_ECHO */ 4518 /* 4519 * process all control chunks... 4520 */ 4521 if (((ch->chunk_type == SCTP_SELECTIVE_ACK) || 4522 (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) || 4523 (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) && 4524 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 4525 /* implied cookie-ack.. we must have lost the ack */ 4526 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, 4527 *netp); 4528 } 4529 4530 process_control_chunks: 4531 while (IS_SCTP_CONTROL(ch)) { 4532 /* validate chunk length */ 4533 chk_length = ntohs(ch->chunk_length); 4534 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n", 4535 ch->chunk_type, chk_length); 4536 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length); 4537 if (chk_length < sizeof(*ch) || 4538 (*offset + (int)chk_length) > length) { 4539 *offset = length; 4540 return (stcb); 4541 } 4542 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks); 4543 /* 4544 * INIT and INIT-ACK only gets the init ack "header" portion 4545 * only because we don't have to process the peer's COOKIE. 4546 * All others get a complete chunk. 4547 */ 4548 switch (ch->chunk_type) { 4549 case SCTP_INITIATION: 4550 contiguous = sizeof(struct sctp_init_chunk); 4551 break; 4552 case SCTP_INITIATION_ACK: 4553 contiguous = sizeof(struct sctp_init_ack_chunk); 4554 break; 4555 default: 4556 contiguous = min(chk_length, sizeof(chunk_buf)); 4557 break; 4558 } 4559 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4560 contiguous, 4561 chunk_buf); 4562 if (ch == NULL) { 4563 *offset = length; 4564 return (stcb); 4565 } 4566 4567 num_chunks++; 4568 /* Save off the last place we got a control from */ 4569 if (stcb != NULL) { 4570 if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) { 4571 /* 4572 * allow last_control to be NULL if 4573 * ASCONF... ASCONF processing will find the 4574 * right net later 4575 */ 4576 if ((netp != NULL) && (*netp != NULL)) 4577 stcb->asoc.last_control_chunk_from = *netp; 4578 } 4579 } 4580 #ifdef SCTP_AUDITING_ENABLED 4581 sctp_audit_log(0xB0, ch->chunk_type); 4582 #endif 4583 4584 /* check to see if this chunk required auth, but isn't */ 4585 if ((stcb != NULL) && 4586 sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) && 4587 !stcb->asoc.authenticated) { 4588 /* "silently" ignore */ 4589 SCTP_STAT_INCR(sctps_recvauthmissing); 4590 goto next_chunk; 4591 } 4592 switch (ch->chunk_type) { 4593 case SCTP_INITIATION: 4594 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n"); 4595 /* The INIT chunk must be the only chunk. */ 4596 if ((num_chunks > 1) || 4597 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4598 /* 4599 * RFC 4960bis requires stopping the 4600 * processing of the packet. 4601 */ 4602 *offset = length; 4603 return (stcb); 4604 } 4605 /* Honor our resource limit. */ 4606 if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) { 4607 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 4608 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err, 4609 mflowtype, mflowid, inp->fibnum, 4610 vrf_id, port); 4611 *offset = length; 4612 if (stcb != NULL) { 4613 SCTP_TCB_UNLOCK(stcb); 4614 } 4615 return (NULL); 4616 } 4617 sctp_handle_init(m, iphlen, *offset, src, dst, sh, 4618 (struct sctp_init_chunk *)ch, inp, 4619 stcb, *netp, 4620 mflowtype, mflowid, 4621 vrf_id, port); 4622 *offset = length; 4623 if (stcb != NULL) { 4624 SCTP_TCB_UNLOCK(stcb); 4625 } 4626 return (NULL); 4627 break; 4628 case SCTP_PAD_CHUNK: 4629 break; 4630 case SCTP_INITIATION_ACK: 4631 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT_ACK\n"); 4632 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4633 /* We are not interested anymore */ 4634 if ((stcb != NULL) && (stcb->asoc.total_output_queue_size)) { 4635 ; 4636 } else { 4637 *offset = length; 4638 if (stcb != NULL) { 4639 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 4640 SCTP_FROM_SCTP_INPUT + SCTP_LOC_29); 4641 } 4642 return (NULL); 4643 } 4644 } 4645 /* The INIT-ACK chunk must be the only chunk. */ 4646 if ((num_chunks > 1) || 4647 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4648 *offset = length; 4649 return (stcb); 4650 } 4651 if ((netp != NULL) && (*netp != NULL)) { 4652 ret = sctp_handle_init_ack(m, iphlen, *offset, 4653 src, dst, sh, 4654 (struct sctp_init_ack_chunk *)ch, 4655 stcb, *netp, 4656 &abort_no_unlock, 4657 mflowtype, mflowid, 4658 vrf_id); 4659 } else { 4660 ret = -1; 4661 } 4662 *offset = length; 4663 if (abort_no_unlock) { 4664 return (NULL); 4665 } 4666 /* 4667 * Special case, I must call the output routine to 4668 * get the cookie echoed 4669 */ 4670 if ((stcb != NULL) && (ret == 0)) { 4671 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 4672 } 4673 return (stcb); 4674 break; 4675 case SCTP_SELECTIVE_ACK: 4676 case SCTP_NR_SELECTIVE_ACK: 4677 { 4678 int abort_now = 0; 4679 uint32_t a_rwnd, cum_ack; 4680 uint16_t num_seg, num_nr_seg, num_dup; 4681 uint8_t flags; 4682 int offset_seg, offset_dup; 4683 4684 SCTPDBG(SCTP_DEBUG_INPUT3, "%s\n", 4685 ch->chunk_type == SCTP_SELECTIVE_ACK ? "SCTP_SACK" : "SCTP_NR_SACK"); 4686 SCTP_STAT_INCR(sctps_recvsacks); 4687 if (stcb == NULL) { 4688 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing %s chunk\n", 4689 (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK"); 4690 break; 4691 } 4692 if (ch->chunk_type == SCTP_SELECTIVE_ACK) { 4693 if (chk_length < sizeof(struct sctp_sack_chunk)) { 4694 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n"); 4695 break; 4696 } 4697 } else { 4698 if (stcb->asoc.nrsack_supported == 0) { 4699 goto unknown_chunk; 4700 } 4701 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) { 4702 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR_SACK chunk, too small\n"); 4703 break; 4704 } 4705 } 4706 if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4707 /*- 4708 * If we have sent a shutdown-ack, we will pay no 4709 * attention to a sack sent in to us since 4710 * we don't care anymore. 4711 */ 4712 break; 4713 } 4714 flags = ch->chunk_flags; 4715 if (ch->chunk_type == SCTP_SELECTIVE_ACK) { 4716 struct sctp_sack_chunk *sack; 4717 4718 sack = (struct sctp_sack_chunk *)ch; 4719 cum_ack = ntohl(sack->sack.cum_tsn_ack); 4720 num_seg = ntohs(sack->sack.num_gap_ack_blks); 4721 num_nr_seg = 0; 4722 num_dup = ntohs(sack->sack.num_dup_tsns); 4723 a_rwnd = ntohl(sack->sack.a_rwnd); 4724 if (sizeof(struct sctp_sack_chunk) + 4725 num_seg * sizeof(struct sctp_gap_ack_block) + 4726 num_dup * sizeof(uint32_t) != chk_length) { 4727 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n"); 4728 break; 4729 } 4730 offset_seg = *offset + sizeof(struct sctp_sack_chunk); 4731 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 4732 } else { 4733 struct sctp_nr_sack_chunk *nr_sack; 4734 4735 nr_sack = (struct sctp_nr_sack_chunk *)ch; 4736 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack); 4737 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks); 4738 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks); 4739 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns); 4740 a_rwnd = ntohl(nr_sack->nr_sack.a_rwnd); 4741 if (sizeof(struct sctp_nr_sack_chunk) + 4742 (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) + 4743 num_dup * sizeof(uint32_t) != chk_length) { 4744 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n"); 4745 break; 4746 } 4747 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk); 4748 offset_dup = offset_seg + (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block); 4749 } 4750 SCTPDBG(SCTP_DEBUG_INPUT3, "%s process cum_ack:%x num_seg:%d a_rwnd:%d\n", 4751 (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK", 4752 cum_ack, num_seg, a_rwnd); 4753 stcb->asoc.seen_a_sack_this_pkt = 1; 4754 if ((stcb->asoc.pr_sctp_cnt == 0) && 4755 (num_seg == 0) && (num_nr_seg == 0) && 4756 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 4757 (stcb->asoc.saw_sack_with_frags == 0) && 4758 (stcb->asoc.saw_sack_with_nr_frags == 0) && 4759 (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) { 4760 /* 4761 * We have a SIMPLE sack having no 4762 * prior segments and data on sent 4763 * queue to be acked. Use the faster 4764 * path sack processing. We also 4765 * allow window update sacks with no 4766 * missing segments to go this way 4767 * too. 4768 */ 4769 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, 4770 &abort_now, ecne_seen); 4771 } else { 4772 if ((netp != NULL) && (*netp != NULL)) { 4773 sctp_handle_sack(m, offset_seg, offset_dup, stcb, 4774 num_seg, num_nr_seg, num_dup, &abort_now, flags, 4775 cum_ack, a_rwnd, ecne_seen); 4776 } 4777 } 4778 if (abort_now) { 4779 /* ABORT signal from sack processing */ 4780 *offset = length; 4781 return (NULL); 4782 } 4783 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 4784 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 4785 (stcb->asoc.stream_queue_cnt == 0)) { 4786 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 4787 } 4788 break; 4789 } 4790 case SCTP_HEARTBEAT_REQUEST: 4791 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n"); 4792 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 4793 SCTP_STAT_INCR(sctps_recvheartbeat); 4794 sctp_send_heartbeat_ack(stcb, m, *offset, 4795 chk_length, *netp); 4796 } 4797 break; 4798 case SCTP_HEARTBEAT_ACK: 4799 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT_ACK\n"); 4800 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) { 4801 /* Its not ours */ 4802 break; 4803 } 4804 SCTP_STAT_INCR(sctps_recvheartbeatack); 4805 if ((netp != NULL) && (*netp != NULL)) { 4806 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch, 4807 stcb, *netp); 4808 } 4809 break; 4810 case SCTP_ABORT_ASSOCIATION: 4811 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n", 4812 (void *)stcb); 4813 *offset = length; 4814 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 4815 if (sctp_handle_abort((struct sctp_abort_chunk *)ch, stcb, *netp)) { 4816 return (NULL); 4817 } else { 4818 return (stcb); 4819 } 4820 } else { 4821 return (NULL); 4822 } 4823 break; 4824 case SCTP_SHUTDOWN: 4825 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n", 4826 (void *)stcb); 4827 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) { 4828 break; 4829 } 4830 if ((netp != NULL) && (*netp != NULL)) { 4831 abort_flag = 0; 4832 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch, 4833 stcb, *netp, &abort_flag); 4834 if (abort_flag) { 4835 *offset = length; 4836 return (NULL); 4837 } 4838 } 4839 break; 4840 case SCTP_SHUTDOWN_ACK: 4841 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_ACK, stcb %p\n", (void *)stcb); 4842 if ((chk_length == sizeof(struct sctp_shutdown_ack_chunk)) && 4843 (stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 4844 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp); 4845 *offset = length; 4846 return (NULL); 4847 } 4848 break; 4849 case SCTP_OPERATION_ERROR: 4850 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP_ERR\n"); 4851 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL) && 4852 sctp_handle_error(ch, stcb, *netp, contiguous) < 0) { 4853 *offset = length; 4854 return (NULL); 4855 } 4856 break; 4857 case SCTP_COOKIE_ECHO: 4858 SCTPDBG(SCTP_DEBUG_INPUT3, 4859 "SCTP_COOKIE_ECHO, stcb %p\n", (void *)stcb); 4860 if ((stcb != NULL) && (stcb->asoc.total_output_queue_size > 0)) { 4861 ; 4862 } else { 4863 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4864 /* We are not interested anymore */ 4865 abend: 4866 if (stcb != NULL) { 4867 SCTP_TCB_UNLOCK(stcb); 4868 } 4869 *offset = length; 4870 return (NULL); 4871 } 4872 } 4873 /*- 4874 * First are we accepting? We do this again here 4875 * since it is possible that a previous endpoint WAS 4876 * listening responded to a INIT-ACK and then 4877 * closed. We opened and bound.. and are now no 4878 * longer listening. 4879 * 4880 * XXXGL: notes on checking listen queue length. 4881 * 1) SCTP_IS_LISTENING() doesn't necessarily mean 4882 * SOLISTENING(), because a listening "UDP type" 4883 * socket isn't listening in terms of the socket 4884 * layer. It is a normal data flow socket, that 4885 * can fork off new connections. Thus, we should 4886 * look into sol_qlen only in case we are !UDP. 4887 * 2) Checking sol_qlen in general requires locking 4888 * the socket, and this code lacks that. 4889 */ 4890 if ((stcb == NULL) && 4891 (!SCTP_IS_LISTENING(inp) || 4892 (((inp->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE) == 0) && 4893 inp->sctp_socket->sol_qlen >= inp->sctp_socket->sol_qlimit))) { 4894 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 4895 (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) { 4896 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 4897 sctp_abort_association(inp, stcb, m, iphlen, 4898 src, dst, sh, op_err, 4899 mflowtype, mflowid, 4900 vrf_id, port); 4901 } 4902 *offset = length; 4903 return (NULL); 4904 } else { 4905 struct mbuf *ret_buf; 4906 struct sctp_inpcb *linp; 4907 struct sctp_tmit_chunk *chk; 4908 4909 if (inp->sctp_flags & (SCTP_PCB_FLAGS_SOCKET_GONE | 4910 SCTP_PCB_FLAGS_SOCKET_ALLGONE)) { 4911 goto abend; 4912 } 4913 4914 if (stcb) { 4915 linp = NULL; 4916 } else { 4917 linp = inp; 4918 } 4919 4920 if (linp != NULL) { 4921 SCTP_ASOC_CREATE_LOCK(linp); 4922 } 4923 4924 if (netp != NULL) { 4925 struct sctp_tcb *locked_stcb; 4926 4927 locked_stcb = stcb; 4928 ret_buf = 4929 sctp_handle_cookie_echo(m, iphlen, 4930 *offset, 4931 src, dst, 4932 sh, 4933 (struct sctp_cookie_echo_chunk *)ch, 4934 &inp, &stcb, netp, 4935 auth_skipped, 4936 auth_offset, 4937 auth_len, 4938 &locked_stcb, 4939 mflowtype, 4940 mflowid, 4941 vrf_id, 4942 port); 4943 if ((locked_stcb != NULL) && (locked_stcb != stcb)) { 4944 SCTP_TCB_UNLOCK(locked_stcb); 4945 } 4946 if (stcb != NULL) { 4947 SCTP_TCB_LOCK_ASSERT(stcb); 4948 } 4949 } else { 4950 ret_buf = NULL; 4951 } 4952 if (linp != NULL) { 4953 SCTP_ASOC_CREATE_UNLOCK(linp); 4954 } 4955 if (ret_buf == NULL) { 4956 if (stcb != NULL) { 4957 SCTP_TCB_UNLOCK(stcb); 4958 } 4959 SCTPDBG(SCTP_DEBUG_INPUT3, 4960 "GAK, null buffer\n"); 4961 *offset = length; 4962 return (NULL); 4963 } 4964 /* if AUTH skipped, see if it verified... */ 4965 if (auth_skipped) { 4966 got_auth = 1; 4967 auth_skipped = 0; 4968 } 4969 /* Restart the timer if we have pending data */ 4970 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 4971 if (chk->whoTo != NULL) { 4972 break; 4973 } 4974 } 4975 if (chk != NULL) { 4976 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 4977 } 4978 } 4979 break; 4980 case SCTP_COOKIE_ACK: 4981 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE_ACK, stcb %p\n", (void *)stcb); 4982 if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) { 4983 break; 4984 } 4985 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4986 /* We are not interested anymore */ 4987 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4988 ; 4989 } else if (stcb) { 4990 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 4991 SCTP_FROM_SCTP_INPUT + SCTP_LOC_30); 4992 *offset = length; 4993 return (NULL); 4994 } 4995 } 4996 if ((netp != NULL) && (*netp != NULL)) { 4997 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp); 4998 } 4999 break; 5000 case SCTP_ECN_ECHO: 5001 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_ECHO\n"); 5002 if (stcb == NULL) { 5003 break; 5004 } 5005 if (stcb->asoc.ecn_supported == 0) { 5006 goto unknown_chunk; 5007 } 5008 if ((chk_length != sizeof(struct sctp_ecne_chunk)) && 5009 (chk_length != sizeof(struct old_sctp_ecne_chunk))) { 5010 break; 5011 } 5012 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, stcb); 5013 ecne_seen = 1; 5014 break; 5015 case SCTP_ECN_CWR: 5016 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_CWR\n"); 5017 if (stcb == NULL) { 5018 break; 5019 } 5020 if (stcb->asoc.ecn_supported == 0) { 5021 goto unknown_chunk; 5022 } 5023 if (chk_length != sizeof(struct sctp_cwr_chunk)) { 5024 break; 5025 } 5026 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp); 5027 break; 5028 case SCTP_SHUTDOWN_COMPLETE: 5029 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_COMPLETE, stcb %p\n", (void *)stcb); 5030 /* must be first and only chunk */ 5031 if ((num_chunks > 1) || 5032 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 5033 *offset = length; 5034 return (stcb); 5035 } 5036 if ((chk_length == sizeof(struct sctp_shutdown_complete_chunk)) && 5037 (stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 5038 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch, 5039 stcb, *netp); 5040 *offset = length; 5041 return (NULL); 5042 } 5043 break; 5044 case SCTP_ASCONF: 5045 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n"); 5046 if (stcb != NULL) { 5047 if (stcb->asoc.asconf_supported == 0) { 5048 goto unknown_chunk; 5049 } 5050 sctp_handle_asconf(m, *offset, src, 5051 (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0); 5052 asconf_cnt++; 5053 } 5054 break; 5055 case SCTP_ASCONF_ACK: 5056 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF_ACK\n"); 5057 if (stcb == NULL) { 5058 break; 5059 } 5060 if (stcb->asoc.asconf_supported == 0) { 5061 goto unknown_chunk; 5062 } 5063 if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) { 5064 break; 5065 } 5066 if ((netp != NULL) && (*netp != NULL)) { 5067 /* He's alive so give him credit */ 5068 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5069 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5070 stcb->asoc.overall_error_count, 5071 0, 5072 SCTP_FROM_SCTP_INPUT, 5073 __LINE__); 5074 } 5075 stcb->asoc.overall_error_count = 0; 5076 sctp_handle_asconf_ack(m, *offset, 5077 (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock); 5078 if (abort_no_unlock) 5079 return (NULL); 5080 } 5081 break; 5082 case SCTP_FORWARD_CUM_TSN: 5083 case SCTP_IFORWARD_CUM_TSN: 5084 SCTPDBG(SCTP_DEBUG_INPUT3, "%s\n", 5085 ch->chunk_type == SCTP_FORWARD_CUM_TSN ? "FORWARD_TSN" : "I_FORWARD_TSN"); 5086 if (stcb == NULL) { 5087 break; 5088 } 5089 if (stcb->asoc.prsctp_supported == 0) { 5090 goto unknown_chunk; 5091 } 5092 if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) { 5093 break; 5094 } 5095 if (((stcb->asoc.idata_supported == 1) && (ch->chunk_type == SCTP_FORWARD_CUM_TSN)) || 5096 ((stcb->asoc.idata_supported == 0) && (ch->chunk_type == SCTP_IFORWARD_CUM_TSN))) { 5097 if (ch->chunk_type == SCTP_FORWARD_CUM_TSN) { 5098 SCTP_SNPRINTF(msg, sizeof(msg), "%s", "FORWARD-TSN chunk received when I-FORWARD-TSN was negotiated"); 5099 } else { 5100 SCTP_SNPRINTF(msg, sizeof(msg), "%s", "I-FORWARD-TSN chunk received when FORWARD-TSN was negotiated"); 5101 } 5102 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); 5103 sctp_abort_an_association(inp, stcb, op_err, false, SCTP_SO_NOT_LOCKED); 5104 *offset = length; 5105 return (NULL); 5106 } 5107 *fwd_tsn_seen = 1; 5108 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5109 /* We are not interested anymore */ 5110 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 5111 SCTP_FROM_SCTP_INPUT + SCTP_LOC_31); 5112 *offset = length; 5113 return (NULL); 5114 } 5115 /* 5116 * For sending a SACK this looks like DATA chunks. 5117 */ 5118 stcb->asoc.last_data_chunk_from = stcb->asoc.last_control_chunk_from; 5119 abort_flag = 0; 5120 sctp_handle_forward_tsn(stcb, 5121 (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset); 5122 if (abort_flag) { 5123 *offset = length; 5124 return (NULL); 5125 } 5126 break; 5127 case SCTP_STREAM_RESET: 5128 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n"); 5129 if (stcb == NULL) { 5130 break; 5131 } 5132 if (stcb->asoc.reconfig_supported == 0) { 5133 goto unknown_chunk; 5134 } 5135 if (chk_length < sizeof(struct sctp_stream_reset_tsn_req)) { 5136 break; 5137 } 5138 if (sctp_handle_stream_reset(stcb, m, *offset, ch)) { 5139 /* stop processing */ 5140 *offset = length; 5141 return (NULL); 5142 } 5143 break; 5144 case SCTP_PACKET_DROPPED: 5145 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n"); 5146 if (stcb == NULL) { 5147 break; 5148 } 5149 if (stcb->asoc.pktdrop_supported == 0) { 5150 goto unknown_chunk; 5151 } 5152 if (chk_length < sizeof(struct sctp_pktdrop_chunk)) { 5153 break; 5154 } 5155 if ((netp != NULL) && (*netp != NULL)) { 5156 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch, 5157 stcb, *netp, 5158 min(chk_length, contiguous)); 5159 } 5160 break; 5161 case SCTP_AUTHENTICATION: 5162 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n"); 5163 if (stcb == NULL) { 5164 /* save the first AUTH for later processing */ 5165 if (auth_skipped == 0) { 5166 auth_offset = *offset; 5167 auth_len = chk_length; 5168 auth_skipped = 1; 5169 } 5170 /* skip this chunk (temporarily) */ 5171 break; 5172 } 5173 if (stcb->asoc.auth_supported == 0) { 5174 goto unknown_chunk; 5175 } 5176 if ((chk_length < (sizeof(struct sctp_auth_chunk))) || 5177 (chk_length > (sizeof(struct sctp_auth_chunk) + 5178 SCTP_AUTH_DIGEST_LEN_MAX))) { 5179 /* Its not ours */ 5180 *offset = length; 5181 return (stcb); 5182 } 5183 if (got_auth == 1) { 5184 /* skip this chunk... it's already auth'd */ 5185 break; 5186 } 5187 got_auth = 1; 5188 if (sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch, m, *offset)) { 5189 /* auth HMAC failed so dump the packet */ 5190 *offset = length; 5191 return (stcb); 5192 } else { 5193 /* remaining chunks are HMAC checked */ 5194 stcb->asoc.authenticated = 1; 5195 } 5196 break; 5197 5198 default: 5199 unknown_chunk: 5200 /* it's an unknown chunk! */ 5201 if ((ch->chunk_type & 0x40) && 5202 (stcb != NULL) && 5203 (SCTP_GET_STATE(stcb) != SCTP_STATE_EMPTY) && 5204 (SCTP_GET_STATE(stcb) != SCTP_STATE_INUSE) && 5205 (SCTP_GET_STATE(stcb) != SCTP_STATE_COOKIE_WAIT)) { 5206 struct sctp_gen_error_cause *cause; 5207 int len; 5208 5209 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_gen_error_cause), 5210 0, M_NOWAIT, 1, MT_DATA); 5211 if (op_err != NULL) { 5212 len = min(SCTP_SIZE32(chk_length), (uint32_t)(length - *offset)); 5213 cause = mtod(op_err, struct sctp_gen_error_cause *); 5214 cause->code = htons(SCTP_CAUSE_UNRECOG_CHUNK); 5215 cause->length = htons((uint16_t)(len + sizeof(struct sctp_gen_error_cause))); 5216 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_gen_error_cause); 5217 SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(m, *offset, len, M_NOWAIT); 5218 if (SCTP_BUF_NEXT(op_err) != NULL) { 5219 #ifdef SCTP_MBUF_LOGGING 5220 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5221 sctp_log_mbc(SCTP_BUF_NEXT(op_err), SCTP_MBUF_ICOPY); 5222 } 5223 #endif 5224 sctp_queue_op_err(stcb, op_err); 5225 } else { 5226 sctp_m_freem(op_err); 5227 } 5228 } 5229 } 5230 if ((ch->chunk_type & 0x80) == 0) { 5231 /* discard this packet */ 5232 *offset = length; 5233 return (stcb); 5234 } /* else skip this bad chunk and continue... */ 5235 break; 5236 } /* switch (ch->chunk_type) */ 5237 5238 next_chunk: 5239 /* get the next chunk */ 5240 *offset += SCTP_SIZE32(chk_length); 5241 if (*offset >= length) { 5242 /* no more data left in the mbuf chain */ 5243 break; 5244 } 5245 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 5246 sizeof(struct sctp_chunkhdr), chunk_buf); 5247 if (ch == NULL) { 5248 *offset = length; 5249 return (stcb); 5250 } 5251 } /* while */ 5252 5253 if ((asconf_cnt > 0) && (stcb != NULL)) { 5254 sctp_send_asconf_ack(stcb); 5255 } 5256 return (stcb); 5257 } 5258 5259 /* 5260 * common input chunk processing (v4 and v6) 5261 */ 5262 void 5263 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length, 5264 struct sockaddr *src, struct sockaddr *dst, 5265 struct sctphdr *sh, struct sctp_chunkhdr *ch, 5266 uint8_t compute_crc, 5267 uint8_t ecn_bits, 5268 uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum, 5269 uint32_t vrf_id, uint16_t port) 5270 { 5271 char msg[SCTP_DIAG_INFO_LEN]; 5272 struct mbuf *m = *mm, *op_err; 5273 struct sctp_inpcb *inp = NULL, *inp_decr = NULL; 5274 struct sctp_tcb *stcb = NULL; 5275 struct sctp_nets *net = NULL; 5276 uint32_t high_tsn; 5277 uint32_t cksum_in_hdr; 5278 int un_sent; 5279 int cnt_ctrl_ready = 0; 5280 int fwd_tsn_seen = 0, data_processed = 0; 5281 bool cksum_validated, stcb_looked_up; 5282 5283 SCTP_STAT_INCR(sctps_recvdatagrams); 5284 #ifdef SCTP_AUDITING_ENABLED 5285 sctp_audit_log(0xE0, 1); 5286 sctp_auditing(0, inp, stcb, net); 5287 #endif 5288 5289 stcb_looked_up = false; 5290 if (compute_crc != 0) { 5291 cksum_validated = false; 5292 cksum_in_hdr = sh->checksum; 5293 if (cksum_in_hdr != htonl(0)) { 5294 uint32_t cksum_calculated; 5295 5296 validate_cksum: 5297 sh->checksum = 0; 5298 cksum_calculated = sctp_calculate_cksum(m, iphlen); 5299 sh->checksum = cksum_in_hdr; 5300 if (cksum_calculated != cksum_in_hdr) { 5301 if (stcb_looked_up) { 5302 /* 5303 * The packet has a zero checksum, 5304 * which is not the correct CRC, no 5305 * stcb has been found or an stcb 5306 * has been found but an incorrect 5307 * zero checksum is not acceptable. 5308 */ 5309 KASSERT(cksum_in_hdr == htonl(0), 5310 ("cksum in header not zero: %x", 5311 ntohl(cksum_in_hdr))); 5312 if ((inp == NULL) && 5313 (SCTP_BASE_SYSCTL(sctp_ootb_with_zero_cksum) == 1)) { 5314 /* 5315 * This is an OOTB packet, 5316 * depending on the sysctl 5317 * variable, pretend that 5318 * the checksum is 5319 * acceptable, to allow an 5320 * appropriate response 5321 * (ABORT, for examlpe) to 5322 * be sent. 5323 */ 5324 KASSERT(stcb == NULL, 5325 ("stcb is %p", stcb)); 5326 SCTP_STAT_INCR(sctps_recvzerocrc); 5327 goto cksum_validated; 5328 } 5329 } else { 5330 stcb = sctp_findassociation_addr(m, offset, src, dst, 5331 sh, ch, &inp, &net, vrf_id); 5332 } 5333 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad cksum in SCTP packet:%x calculated:%x m:%p mlen:%d iphlen:%d\n", 5334 ntohl(cksum_in_hdr), ntohl(cksum_calculated), (void *)m, length, iphlen); 5335 #if defined(INET) || defined(INET6) 5336 if ((ch->chunk_type != SCTP_INITIATION) && 5337 (net != NULL) && (net->port != port)) { 5338 if (net->port == 0) { 5339 /* 5340 * UDP encapsulation turned 5341 * on. 5342 */ 5343 net->mtu -= sizeof(struct udphdr); 5344 if (stcb->asoc.smallest_mtu > net->mtu) { 5345 sctp_pathmtu_adjustment(stcb, net->mtu, true); 5346 } 5347 } else if (port == 0) { 5348 /* 5349 * UDP encapsulation turned 5350 * off. 5351 */ 5352 net->mtu += sizeof(struct udphdr); 5353 /* XXX Update smallest_mtu */ 5354 } 5355 net->port = port; 5356 } 5357 #endif 5358 if (net != NULL) { 5359 net->flowtype = mflowtype; 5360 net->flowid = mflowid; 5361 } 5362 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5363 if ((inp != NULL) && (stcb != NULL)) { 5364 if (stcb->asoc.pktdrop_supported) { 5365 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1); 5366 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED); 5367 } 5368 } else if ((inp != NULL) && (stcb == NULL)) { 5369 inp_decr = inp; 5370 } 5371 SCTP_STAT_INCR(sctps_badsum); 5372 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors); 5373 goto out; 5374 } else { 5375 cksum_validated = true; 5376 } 5377 } 5378 KASSERT(cksum_validated || cksum_in_hdr == htonl(0), 5379 ("cksum 0x%08x not zero and not validated", ntohl(cksum_in_hdr))); 5380 if (!cksum_validated) { 5381 stcb = sctp_findassociation_addr(m, offset, src, dst, 5382 sh, ch, &inp, &net, vrf_id); 5383 stcb_looked_up = true; 5384 if (stcb == NULL) { 5385 goto validate_cksum; 5386 } 5387 if (stcb->asoc.rcv_edmid == SCTP_EDMID_NONE) { 5388 goto validate_cksum; 5389 } 5390 KASSERT(stcb->asoc.rcv_edmid == SCTP_EDMID_LOWER_LAYER_DTLS, 5391 ("Unexpected EDMID %u", stcb->asoc.rcv_edmid)); 5392 SCTP_STAT_INCR(sctps_recvzerocrc); 5393 } 5394 } 5395 cksum_validated: 5396 /* Destination port of 0 is illegal, based on RFC4960. */ 5397 if (sh->dest_port == htons(0)) { 5398 SCTP_STAT_INCR(sctps_hdrops); 5399 if ((stcb == NULL) && (inp != NULL)) { 5400 inp_decr = inp; 5401 } 5402 goto out; 5403 } 5404 if (!stcb_looked_up) { 5405 stcb = sctp_findassociation_addr(m, offset, src, dst, 5406 sh, ch, &inp, &net, vrf_id); 5407 } 5408 #if defined(INET) || defined(INET6) 5409 if ((ch->chunk_type != SCTP_INITIATION) && 5410 (net != NULL) && (net->port != port)) { 5411 if (net->port == 0) { 5412 /* UDP encapsulation turned on. */ 5413 net->mtu -= sizeof(struct udphdr); 5414 if (stcb->asoc.smallest_mtu > net->mtu) { 5415 sctp_pathmtu_adjustment(stcb, net->mtu, true); 5416 } 5417 } else if (port == 0) { 5418 /* UDP encapsulation turned off. */ 5419 net->mtu += sizeof(struct udphdr); 5420 /* XXX Update smallest_mtu */ 5421 } 5422 net->port = port; 5423 } 5424 #endif 5425 if (net != NULL) { 5426 net->flowtype = mflowtype; 5427 net->flowid = mflowid; 5428 } 5429 if (inp == NULL) { 5430 SCTP_STAT_INCR(sctps_noport); 5431 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5432 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) { 5433 goto out; 5434 } 5435 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 5436 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks); 5437 sctp_send_shutdown_complete2(src, dst, sh, 5438 mflowtype, mflowid, fibnum, 5439 vrf_id, port); 5440 goto out; 5441 } 5442 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) { 5443 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks); 5444 goto out; 5445 } 5446 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) { 5447 if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) || 5448 ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) && 5449 (ch->chunk_type != SCTP_INIT))) { 5450 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5451 "Out of the blue"); 5452 sctp_send_abort(m, iphlen, src, dst, 5453 sh, 0, op_err, 5454 mflowtype, mflowid, fibnum, 5455 vrf_id, port); 5456 } 5457 } 5458 goto out; 5459 } else if (stcb == NULL) { 5460 inp_decr = inp; 5461 } 5462 SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n", 5463 (void *)m, iphlen, offset, length, (void *)stcb); 5464 if (stcb) { 5465 /* always clear this before beginning a packet */ 5466 stcb->asoc.authenticated = 0; 5467 stcb->asoc.seen_a_sack_this_pkt = 0; 5468 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n", 5469 (void *)stcb, stcb->asoc.state); 5470 5471 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) || 5472 (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) { 5473 /*- 5474 * If we hit here, we had a ref count 5475 * up when the assoc was aborted and the 5476 * timer is clearing out the assoc, we should 5477 * NOT respond to any packet.. its OOTB. 5478 */ 5479 SCTP_TCB_UNLOCK(stcb); 5480 stcb = NULL; 5481 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5482 SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5483 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5484 msg); 5485 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5486 mflowtype, mflowid, inp->fibnum, 5487 vrf_id, port); 5488 goto out; 5489 } 5490 } 5491 if (IS_SCTP_CONTROL(ch)) { 5492 /* process the control portion of the SCTP packet */ 5493 /* sa_ignore NO_NULL_CHK */ 5494 stcb = sctp_process_control(m, iphlen, &offset, length, 5495 src, dst, sh, ch, 5496 inp, stcb, &net, &fwd_tsn_seen, 5497 mflowtype, mflowid, fibnum, 5498 vrf_id, port); 5499 if (stcb) { 5500 /* 5501 * This covers us if the cookie-echo was there and 5502 * it changes our INP. 5503 */ 5504 inp = stcb->sctp_ep; 5505 #if defined(INET) || defined(INET6) 5506 if ((ch->chunk_type != SCTP_INITIATION) && 5507 (net != NULL) && (net->port != port)) { 5508 if (net->port == 0) { 5509 /* UDP encapsulation turned on. */ 5510 net->mtu -= sizeof(struct udphdr); 5511 if (stcb->asoc.smallest_mtu > net->mtu) { 5512 sctp_pathmtu_adjustment(stcb, net->mtu, true); 5513 } 5514 } else if (port == 0) { 5515 /* UDP encapsulation turned off. */ 5516 net->mtu += sizeof(struct udphdr); 5517 /* XXX Update smallest_mtu */ 5518 } 5519 net->port = port; 5520 } 5521 #endif 5522 } 5523 } else { 5524 /* 5525 * no control chunks, so pre-process DATA chunks (these 5526 * checks are taken care of by control processing) 5527 */ 5528 5529 /* 5530 * if DATA only packet, and auth is required, then punt... 5531 * can't have authenticated without any AUTH (control) 5532 * chunks 5533 */ 5534 if ((stcb != NULL) && 5535 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) { 5536 /* "silently" ignore */ 5537 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5538 SCTP_STAT_INCR(sctps_recvauthmissing); 5539 goto out; 5540 } 5541 if (stcb == NULL) { 5542 /* out of the blue DATA chunk */ 5543 SCTP_PROBE5(receive, NULL, NULL, m, NULL, sh); 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, fibnum, 5549 vrf_id, port); 5550 goto out; 5551 } 5552 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) { 5553 /* v_tag mismatch! */ 5554 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5555 SCTP_STAT_INCR(sctps_badvtag); 5556 goto out; 5557 } 5558 } 5559 5560 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5561 if (stcb == NULL) { 5562 /* 5563 * no valid TCB for this packet, or we found it's a bad 5564 * packet while processing control, or we're done with this 5565 * packet (done or skip rest of data), so we drop it... 5566 */ 5567 goto out; 5568 } 5569 5570 /* 5571 * DATA chunk processing 5572 */ 5573 /* plow through the data chunks while length > offset */ 5574 5575 /* 5576 * Rest should be DATA only. Check authentication state if AUTH for 5577 * DATA is required. 5578 */ 5579 if ((length > offset) && 5580 (stcb != NULL) && 5581 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) && 5582 !stcb->asoc.authenticated) { 5583 /* "silently" ignore */ 5584 SCTP_STAT_INCR(sctps_recvauthmissing); 5585 SCTPDBG(SCTP_DEBUG_AUTH1, 5586 "Data chunk requires AUTH, skipped\n"); 5587 goto trigger_send; 5588 } 5589 if (length > offset) { 5590 int retval; 5591 5592 /* 5593 * First check to make sure our state is correct. We would 5594 * not get here unless we really did have a tag, so we don't 5595 * abort if this happens, just dump the chunk silently. 5596 */ 5597 switch (SCTP_GET_STATE(stcb)) { 5598 case SCTP_STATE_COOKIE_ECHOED: 5599 /* 5600 * we consider data with valid tags in this state 5601 * shows us the cookie-ack was lost. Imply it was 5602 * there. 5603 */ 5604 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net); 5605 break; 5606 case SCTP_STATE_COOKIE_WAIT: 5607 /* 5608 * We consider OOTB any data sent during asoc setup. 5609 */ 5610 SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5611 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5612 msg); 5613 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5614 mflowtype, mflowid, inp->fibnum, 5615 vrf_id, port); 5616 goto out; 5617 /* sa_ignore NOTREACHED */ 5618 break; 5619 case SCTP_STATE_EMPTY: /* should not happen */ 5620 case SCTP_STATE_INUSE: /* should not happen */ 5621 case SCTP_STATE_SHUTDOWN_RECEIVED: /* This is a peer error */ 5622 case SCTP_STATE_SHUTDOWN_ACK_SENT: 5623 default: 5624 goto out; 5625 /* sa_ignore NOTREACHED */ 5626 break; 5627 case SCTP_STATE_OPEN: 5628 case SCTP_STATE_SHUTDOWN_SENT: 5629 break; 5630 } 5631 /* plow through the data chunks while length > offset */ 5632 retval = sctp_process_data(mm, iphlen, &offset, length, 5633 inp, stcb, net, &high_tsn); 5634 if (retval == 2) { 5635 /* 5636 * The association aborted, NO UNLOCK needed since 5637 * the association is destroyed. 5638 */ 5639 stcb = NULL; 5640 goto out; 5641 } 5642 if (retval == 0) { 5643 data_processed = 1; 5644 } 5645 /* 5646 * Anything important needs to have been m_copy'ed in 5647 * process_data 5648 */ 5649 } 5650 5651 /* take care of ecn */ 5652 if ((data_processed == 1) && 5653 (stcb->asoc.ecn_supported == 1) && 5654 ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) { 5655 /* Yep, we need to add a ECNE */ 5656 sctp_send_ecn_echo(stcb, net, high_tsn); 5657 } 5658 5659 if ((data_processed == 0) && (fwd_tsn_seen)) { 5660 int was_a_gap; 5661 uint32_t highest_tsn; 5662 5663 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) { 5664 highest_tsn = stcb->asoc.highest_tsn_inside_nr_map; 5665 } else { 5666 highest_tsn = stcb->asoc.highest_tsn_inside_map; 5667 } 5668 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn); 5669 stcb->asoc.send_sack = 1; 5670 sctp_sack_check(stcb, was_a_gap); 5671 } else if (fwd_tsn_seen) { 5672 stcb->asoc.send_sack = 1; 5673 } 5674 /* trigger send of any chunks in queue... */ 5675 trigger_send: 5676 #ifdef SCTP_AUDITING_ENABLED 5677 sctp_audit_log(0xE0, 2); 5678 sctp_auditing(1, inp, stcb, net); 5679 #endif 5680 SCTPDBG(SCTP_DEBUG_INPUT1, 5681 "Check for chunk output prw:%d tqe:%d tf=%d\n", 5682 stcb->asoc.peers_rwnd, 5683 TAILQ_EMPTY(&stcb->asoc.control_send_queue), 5684 stcb->asoc.total_flight); 5685 un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight); 5686 if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 5687 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq; 5688 } 5689 if (!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue) || 5690 cnt_ctrl_ready || 5691 stcb->asoc.trigger_reset || 5692 ((un_sent > 0) && 5693 (stcb->asoc.peers_rwnd > 0 || stcb->asoc.total_flight == 0))) { 5694 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n"); 5695 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 5696 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n"); 5697 } 5698 #ifdef SCTP_AUDITING_ENABLED 5699 sctp_audit_log(0xE0, 3); 5700 sctp_auditing(2, inp, stcb, net); 5701 #endif 5702 out: 5703 if (stcb != NULL) { 5704 SCTP_TCB_UNLOCK(stcb); 5705 } 5706 if (inp_decr != NULL) { 5707 /* reduce ref-count */ 5708 SCTP_INP_WLOCK(inp_decr); 5709 SCTP_INP_DECR_REF(inp_decr); 5710 SCTP_INP_WUNLOCK(inp_decr); 5711 } 5712 return; 5713 } 5714 5715 #ifdef INET 5716 void 5717 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port) 5718 { 5719 struct mbuf *m; 5720 int iphlen; 5721 uint32_t vrf_id = 0; 5722 uint8_t ecn_bits; 5723 struct sockaddr_in src, dst; 5724 struct ip *ip; 5725 struct sctphdr *sh; 5726 struct sctp_chunkhdr *ch; 5727 int length, offset; 5728 uint8_t compute_crc; 5729 uint32_t mflowid; 5730 uint8_t mflowtype; 5731 uint16_t fibnum; 5732 5733 iphlen = off; 5734 if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) { 5735 SCTP_RELEASE_PKT(i_pak); 5736 return; 5737 } 5738 m = SCTP_HEADER_TO_CHAIN(i_pak); 5739 #ifdef SCTP_MBUF_LOGGING 5740 /* Log in any input mbufs */ 5741 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5742 sctp_log_mbc(m, SCTP_MBUF_INPUT); 5743 } 5744 #endif 5745 #ifdef SCTP_PACKET_LOGGING 5746 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) { 5747 sctp_packet_log(m); 5748 } 5749 #endif 5750 SCTPDBG(SCTP_DEBUG_CRCOFFLOAD, 5751 "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n", 5752 m->m_pkthdr.len, 5753 if_name(m->m_pkthdr.rcvif), 5754 (int)m->m_pkthdr.csum_flags, CSUM_BITS); 5755 mflowid = m->m_pkthdr.flowid; 5756 mflowtype = M_HASHTYPE_GET(m); 5757 fibnum = M_GETFIB(m); 5758 SCTP_STAT_INCR(sctps_recvpackets); 5759 SCTP_STAT_INCR_COUNTER64(sctps_inpackets); 5760 /* Get IP, SCTP, and first chunk header together in the first mbuf. */ 5761 offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr); 5762 if (SCTP_BUF_LEN(m) < offset) { 5763 if ((m = m_pullup(m, offset)) == NULL) { 5764 SCTP_STAT_INCR(sctps_hdrops); 5765 return; 5766 } 5767 } 5768 ip = mtod(m, struct ip *); 5769 sh = (struct sctphdr *)((caddr_t)ip + iphlen); 5770 ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr)); 5771 offset -= sizeof(struct sctp_chunkhdr); 5772 memset(&src, 0, sizeof(struct sockaddr_in)); 5773 src.sin_family = AF_INET; 5774 src.sin_len = sizeof(struct sockaddr_in); 5775 src.sin_port = sh->src_port; 5776 src.sin_addr = ip->ip_src; 5777 memset(&dst, 0, sizeof(struct sockaddr_in)); 5778 dst.sin_family = AF_INET; 5779 dst.sin_len = sizeof(struct sockaddr_in); 5780 dst.sin_port = sh->dest_port; 5781 dst.sin_addr = ip->ip_dst; 5782 length = ntohs(ip->ip_len); 5783 /* Validate mbuf chain length with IP payload length. */ 5784 if (SCTP_HEADER_LEN(m) != length) { 5785 SCTPDBG(SCTP_DEBUG_INPUT1, 5786 "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m)); 5787 SCTP_STAT_INCR(sctps_hdrops); 5788 goto out; 5789 } 5790 /* SCTP does not allow broadcasts or multicasts */ 5791 if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) { 5792 goto out; 5793 } 5794 if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) { 5795 goto out; 5796 } 5797 ecn_bits = ip->ip_tos; 5798 if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) { 5799 SCTP_STAT_INCR(sctps_recvhwcrc); 5800 compute_crc = 0; 5801 } else { 5802 SCTP_STAT_INCR(sctps_recvswcrc); 5803 compute_crc = 1; 5804 } 5805 sctp_common_input_processing(&m, iphlen, offset, length, 5806 (struct sockaddr *)&src, 5807 (struct sockaddr *)&dst, 5808 sh, ch, 5809 compute_crc, 5810 ecn_bits, 5811 mflowtype, mflowid, fibnum, 5812 vrf_id, port); 5813 out: 5814 if (m) { 5815 sctp_m_freem(m); 5816 } 5817 return; 5818 } 5819 5820 #if defined(SCTP_MCORE_INPUT) && defined(SMP) 5821 extern int *sctp_cpuarry; 5822 #endif 5823 5824 int 5825 sctp_input(struct mbuf **mp, int *offp, int proto SCTP_UNUSED) 5826 { 5827 struct mbuf *m; 5828 int off; 5829 5830 m = *mp; 5831 off = *offp; 5832 #if defined(SCTP_MCORE_INPUT) && defined(SMP) 5833 if (mp_ncpus > 1) { 5834 struct ip *ip; 5835 struct sctphdr *sh; 5836 int offset; 5837 int cpu_to_use; 5838 uint32_t flowid, tag; 5839 5840 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) { 5841 flowid = m->m_pkthdr.flowid; 5842 } else { 5843 /* 5844 * No flow id built by lower layers fix it so we 5845 * create one. 5846 */ 5847 offset = off + sizeof(struct sctphdr); 5848 if (SCTP_BUF_LEN(m) < offset) { 5849 if ((m = m_pullup(m, offset)) == NULL) { 5850 SCTP_STAT_INCR(sctps_hdrops); 5851 return (IPPROTO_DONE); 5852 } 5853 } 5854 ip = mtod(m, struct ip *); 5855 sh = (struct sctphdr *)((caddr_t)ip + off); 5856 tag = htonl(sh->v_tag); 5857 flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port); 5858 m->m_pkthdr.flowid = flowid; 5859 M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE_HASH); 5860 } 5861 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus]; 5862 sctp_queue_to_mcore(m, off, cpu_to_use); 5863 return (IPPROTO_DONE); 5864 } 5865 #endif 5866 sctp_input_with_port(m, off, 0); 5867 return (IPPROTO_DONE); 5868 } 5869 #endif 5870