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 <netinet/sctp_os.h> 36 #include <netinet/sctp_var.h> 37 #include <netinet/sctp_sysctl.h> 38 #include <netinet/sctp_pcb.h> 39 #include <netinet/sctp_header.h> 40 #include <netinet/sctputil.h> 41 #include <netinet/sctp_output.h> 42 #include <netinet/sctp_input.h> 43 #include <netinet/sctp_auth.h> 44 #include <netinet/sctp_indata.h> 45 #include <netinet/sctp_asconf.h> 46 #include <netinet/sctp_bsd_addr.h> 47 #include <netinet/sctp_timer.h> 48 #include <netinet/sctp_crc32.h> 49 #include <netinet/sctp_kdtrace.h> 50 #if defined(INET) || defined(INET6) 51 #include <netinet/udp.h> 52 #endif 53 #include <sys/smp.h> 54 55 static void 56 sctp_stop_all_cookie_timers(struct sctp_tcb *stcb) 57 { 58 struct sctp_nets *net; 59 60 /* 61 * This now not only stops all cookie timers it also stops any INIT 62 * timers as well. This will make sure that the timers are stopped 63 * in all collision cases. 64 */ 65 SCTP_TCB_LOCK_ASSERT(stcb); 66 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 67 if (net->rxt_timer.type == SCTP_TIMER_TYPE_COOKIE) { 68 sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE, 69 stcb->sctp_ep, 70 stcb, 71 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_1); 72 } else if (net->rxt_timer.type == SCTP_TIMER_TYPE_INIT) { 73 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, 74 stcb->sctp_ep, 75 stcb, 76 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_2); 77 } 78 } 79 } 80 81 /* INIT handler */ 82 static void 83 sctp_handle_init(struct mbuf *m, int iphlen, int offset, 84 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 85 struct sctp_init_chunk *cp, struct sctp_inpcb *inp, 86 struct sctp_tcb *stcb, struct sctp_nets *net, 87 uint8_t mflowtype, uint32_t mflowid, 88 uint32_t vrf_id, uint16_t port) 89 { 90 struct sctp_init *init; 91 struct mbuf *op_err; 92 93 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_init: handling INIT tcb:%p\n", 94 (void *)stcb); 95 if (stcb == NULL) { 96 SCTP_INP_RLOCK(inp); 97 } 98 /* Validate parameters */ 99 init = &cp->init; 100 if (ntohl(init->initiate_tag) == 0) { 101 goto outnow; 102 } 103 if ((ntohl(init->a_rwnd) < SCTP_MIN_RWND) || 104 (ntohs(init->num_inbound_streams) == 0) || 105 (ntohs(init->num_outbound_streams) == 0)) { 106 /* protocol error... send abort */ 107 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 108 sctp_send_abort(m, iphlen, src, dst, sh, init->initiate_tag, op_err, 109 mflowtype, mflowid, inp->fibnum, 110 vrf_id, port); 111 goto outnow; 112 } 113 if (sctp_validate_init_auth_params(m, offset + sizeof(*cp), 114 offset + ntohs(cp->ch.chunk_length))) { 115 /* auth parameter(s) error... send abort */ 116 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 117 "Problem with AUTH parameters"); 118 sctp_send_abort(m, iphlen, src, dst, sh, init->initiate_tag, op_err, 119 mflowtype, mflowid, inp->fibnum, 120 vrf_id, port); 121 goto outnow; 122 } 123 /* We are only accepting if we have a listening socket. */ 124 if ((stcb == NULL) && 125 ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 126 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) || 127 (!SCTP_IS_LISTENING(inp)))) { 128 /* 129 * FIX ME ?? What about TCP model and we have a 130 * match/restart case? Actually no fix is needed. the lookup 131 * will always find the existing assoc so stcb would not be 132 * NULL. It may be questionable to do this since we COULD 133 * just send back the INIT-ACK and hope that the app did 134 * accept()'s by the time the COOKIE was sent. But there is 135 * a price to pay for COOKIE generation and I don't want to 136 * pay it on the chance that the app will actually do some 137 * accepts(). The App just looses and should NOT be in this 138 * state :-) 139 */ 140 if (SCTP_BASE_SYSCTL(sctp_blackhole) == 0) { 141 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 142 "No listener"); 143 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err, 144 mflowtype, mflowid, inp->fibnum, 145 vrf_id, port); 146 } 147 goto outnow; 148 } 149 if ((stcb != NULL) && 150 (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT)) { 151 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending SHUTDOWN-ACK\n"); 152 sctp_send_shutdown_ack(stcb, NULL); 153 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 154 } else { 155 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n"); 156 sctp_send_initiate_ack(inp, stcb, net, m, iphlen, offset, 157 src, dst, sh, cp, 158 mflowtype, mflowid, 159 vrf_id, port); 160 } 161 outnow: 162 if (stcb == NULL) { 163 SCTP_INP_RUNLOCK(inp); 164 } 165 } 166 167 /* 168 * process peer "INIT/INIT-ACK" chunk returns value < 0 on error 169 */ 170 171 int 172 sctp_is_there_unsent_data(struct sctp_tcb *stcb, int so_locked) 173 { 174 int unsent_data; 175 unsigned int i; 176 struct sctp_stream_queue_pending *sp; 177 struct sctp_association *asoc; 178 179 SCTP_TCB_LOCK_ASSERT(stcb); 180 181 /* 182 * This function returns if any stream has true unsent data on it. 183 * Note that as it looks through it will clean up any places that 184 * have old data that has been sent but left at top of stream queue. 185 */ 186 asoc = &stcb->asoc; 187 unsent_data = 0; 188 if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 189 /* Check to see if some data queued */ 190 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 191 /* sa_ignore FREED_MEMORY */ 192 sp = TAILQ_FIRST(&stcb->asoc.strmout[i].outqueue); 193 if (sp == NULL) { 194 continue; 195 } 196 if ((sp->msg_is_complete) && 197 (sp->length == 0) && 198 (sp->sender_all_done)) { 199 /* 200 * We are doing differed cleanup. Last time 201 * through when we took all the data the 202 * sender_all_done was not set. 203 */ 204 if (sp->put_last_out == 0) { 205 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n"); 206 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n", 207 sp->sender_all_done, 208 sp->length, 209 sp->msg_is_complete, 210 sp->put_last_out); 211 } 212 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1); 213 TAILQ_REMOVE(&stcb->asoc.strmout[i].outqueue, sp, next); 214 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, &asoc->strmout[i], sp); 215 if (sp->net) { 216 sctp_free_remote_addr(sp->net); 217 sp->net = NULL; 218 } 219 if (sp->data) { 220 sctp_m_freem(sp->data); 221 sp->data = NULL; 222 } 223 sctp_free_a_strmoq(stcb, sp, so_locked); 224 if (!TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) { 225 unsent_data++; 226 } 227 } else { 228 unsent_data++; 229 } 230 if (unsent_data > 0) { 231 break; 232 } 233 } 234 } 235 return (unsent_data); 236 } 237 238 static int 239 sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb) 240 { 241 struct sctp_init *init; 242 struct sctp_association *asoc; 243 struct sctp_nets *lnet; 244 unsigned int i; 245 246 SCTP_TCB_LOCK_ASSERT(stcb); 247 248 init = &cp->init; 249 asoc = &stcb->asoc; 250 /* save off parameters */ 251 asoc->peer_vtag = ntohl(init->initiate_tag); 252 asoc->peers_rwnd = ntohl(init->a_rwnd); 253 /* init tsn's */ 254 asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1; 255 256 if (!TAILQ_EMPTY(&asoc->nets)) { 257 /* update any ssthresh's that may have a default */ 258 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) { 259 lnet->ssthresh = asoc->peers_rwnd; 260 if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) { 261 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION); 262 } 263 } 264 } 265 if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) { 266 unsigned int newcnt; 267 struct sctp_stream_out *outs; 268 struct sctp_stream_queue_pending *sp, *nsp; 269 struct sctp_tmit_chunk *chk, *nchk; 270 271 /* abandon the upper streams */ 272 newcnt = ntohs(init->num_inbound_streams); 273 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) { 274 if (chk->rec.data.sid >= newcnt) { 275 TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next); 276 asoc->send_queue_cnt--; 277 if (asoc->strmout[chk->rec.data.sid].chunks_on_queues > 0) { 278 asoc->strmout[chk->rec.data.sid].chunks_on_queues--; 279 #ifdef INVARIANTS 280 } else { 281 panic("No chunks on the queues for sid %u.", chk->rec.data.sid); 282 #endif 283 } 284 if (chk->data != NULL) { 285 sctp_free_bufspace(stcb, asoc, chk, 1); 286 sctp_ulp_notify(SCTP_NOTIFY_UNSENT_DG_FAIL, stcb, 287 0, chk, SCTP_SO_NOT_LOCKED); 288 if (chk->data) { 289 sctp_m_freem(chk->data); 290 chk->data = NULL; 291 } 292 } 293 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 294 /* sa_ignore FREED_MEMORY */ 295 } 296 } 297 if (asoc->strmout) { 298 for (i = newcnt; i < asoc->pre_open_streams; i++) { 299 outs = &asoc->strmout[i]; 300 TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) { 301 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1); 302 TAILQ_REMOVE(&outs->outqueue, sp, next); 303 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, outs, sp); 304 sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL, 305 stcb, 0, sp, SCTP_SO_NOT_LOCKED); 306 if (sp->data) { 307 sctp_m_freem(sp->data); 308 sp->data = NULL; 309 } 310 if (sp->net) { 311 sctp_free_remote_addr(sp->net); 312 sp->net = NULL; 313 } 314 /* Free the chunk */ 315 sctp_free_a_strmoq(stcb, sp, SCTP_SO_NOT_LOCKED); 316 /* sa_ignore FREED_MEMORY */ 317 } 318 outs->state = SCTP_STREAM_CLOSED; 319 } 320 } 321 /* cut back the count */ 322 asoc->pre_open_streams = newcnt; 323 } 324 asoc->streamoutcnt = asoc->pre_open_streams; 325 if (asoc->strmout) { 326 for (i = 0; i < asoc->streamoutcnt; i++) { 327 asoc->strmout[i].state = SCTP_STREAM_OPEN; 328 } 329 } 330 /* EY - nr_sack: initialize highest tsn in nr_mapping_array */ 331 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 332 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 333 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 334 } 335 /* This is the next one we expect */ 336 asoc->str_reset_seq_in = asoc->asconf_seq_in + 1; 337 338 asoc->mapping_array_base_tsn = ntohl(init->initial_tsn); 339 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in; 340 341 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 342 /* open the requested streams */ 343 344 if (asoc->strmin != NULL) { 345 /* Free the old ones */ 346 for (i = 0; i < asoc->streamincnt; i++) { 347 sctp_clean_up_stream(stcb, &asoc->strmin[i].inqueue); 348 sctp_clean_up_stream(stcb, &asoc->strmin[i].uno_inqueue); 349 } 350 SCTP_FREE(asoc->strmin, SCTP_M_STRMI); 351 } 352 if (asoc->max_inbound_streams > ntohs(init->num_outbound_streams)) { 353 asoc->streamincnt = ntohs(init->num_outbound_streams); 354 } else { 355 asoc->streamincnt = asoc->max_inbound_streams; 356 } 357 SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt * 358 sizeof(struct sctp_stream_in), SCTP_M_STRMI); 359 if (asoc->strmin == NULL) { 360 /* we didn't get memory for the streams! */ 361 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n"); 362 return (-1); 363 } 364 for (i = 0; i < asoc->streamincnt; i++) { 365 asoc->strmin[i].sid = i; 366 asoc->strmin[i].last_mid_delivered = 0xffffffff; 367 TAILQ_INIT(&asoc->strmin[i].inqueue); 368 TAILQ_INIT(&asoc->strmin[i].uno_inqueue); 369 asoc->strmin[i].pd_api_started = 0; 370 asoc->strmin[i].delivery_started = 0; 371 } 372 /* 373 * load_address_from_init will put the addresses into the 374 * association when the COOKIE is processed or the INIT-ACK is 375 * processed. Both types of COOKIE's existing and new call this 376 * routine. It will remove addresses that are no longer in the 377 * association (for the restarting case where addresses are 378 * removed). Up front when the INIT arrives we will discard it if it 379 * is a restart and new addresses have been added. 380 */ 381 /* sa_ignore MEMLEAK */ 382 return (0); 383 } 384 385 /* 386 * INIT-ACK message processing/consumption returns value < 0 on error 387 */ 388 static int 389 sctp_process_init_ack(struct mbuf *m, int iphlen, int offset, 390 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 391 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 392 struct sctp_nets *net, int *abort_no_unlock, 393 uint8_t mflowtype, uint32_t mflowid, 394 uint32_t vrf_id) 395 { 396 struct sctp_association *asoc; 397 struct mbuf *op_err; 398 int retval, abort_flag, cookie_found; 399 int initack_limit; 400 int nat_friendly = 0; 401 402 /* First verify that we have no illegal param's */ 403 abort_flag = 0; 404 cookie_found = 0; 405 406 op_err = sctp_arethere_unrecognized_parameters(m, 407 (offset + sizeof(struct sctp_init_chunk)), 408 &abort_flag, (struct sctp_chunkhdr *)cp, 409 &nat_friendly, &cookie_found); 410 if (abort_flag) { 411 /* Send an abort and notify peer */ 412 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 413 src, dst, sh, op_err, 414 mflowtype, mflowid, 415 vrf_id, net->port); 416 *abort_no_unlock = 1; 417 return (-1); 418 } 419 if (!cookie_found) { 420 uint16_t len; 421 422 /* Only report the missing cookie parameter */ 423 if (op_err != NULL) { 424 sctp_m_freem(op_err); 425 } 426 len = (uint16_t)(sizeof(struct sctp_error_missing_param) + sizeof(uint16_t)); 427 /* We abort with an error of missing mandatory param */ 428 op_err = sctp_get_mbuf_for_msg(len, 0, M_NOWAIT, 1, MT_DATA); 429 if (op_err != NULL) { 430 struct sctp_error_missing_param *cause; 431 432 SCTP_BUF_LEN(op_err) = len; 433 cause = mtod(op_err, struct sctp_error_missing_param *); 434 /* Subtract the reserved param */ 435 cause->cause.code = htons(SCTP_CAUSE_MISSING_PARAM); 436 cause->cause.length = htons(len); 437 cause->num_missing_params = htonl(1); 438 cause->type[0] = htons(SCTP_STATE_COOKIE); 439 } 440 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 441 src, dst, sh, op_err, 442 mflowtype, mflowid, 443 vrf_id, net->port); 444 *abort_no_unlock = 1; 445 return (-3); 446 } 447 asoc = &stcb->asoc; 448 asoc->peer_supports_nat = (uint8_t)nat_friendly; 449 /* process the peer's parameters in the INIT-ACK */ 450 if (sctp_process_init((struct sctp_init_chunk *)cp, stcb) < 0) { 451 if (op_err != NULL) { 452 sctp_m_freem(op_err); 453 } 454 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 455 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_init() failed\n"); 456 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 457 src, dst, sh, op_err, 458 mflowtype, mflowid, 459 vrf_id, net->port); 460 *abort_no_unlock = 1; 461 return (-1); 462 } 463 initack_limit = offset + ntohs(cp->ch.chunk_length); 464 /* load all addresses */ 465 if ((retval = sctp_load_addresses_from_init(stcb, m, 466 offset + sizeof(struct sctp_init_chunk), 467 initack_limit, src, dst, NULL, stcb->asoc.port)) < 0) { 468 if (op_err != NULL) { 469 sctp_m_freem(op_err); 470 } 471 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 472 "Problem with address parameters"); 473 SCTPDBG(SCTP_DEBUG_INPUT1, 474 "Load addresses from INIT causes an abort %d\n", 475 retval); 476 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 477 src, dst, sh, op_err, 478 mflowtype, mflowid, 479 vrf_id, net->port); 480 *abort_no_unlock = 1; 481 return (-1); 482 } 483 /* if the peer doesn't support asconf, flush the asconf queue */ 484 if (asoc->asconf_supported == 0) { 485 struct sctp_asconf_addr *param, *nparam; 486 487 TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) { 488 TAILQ_REMOVE(&asoc->asconf_queue, param, next); 489 SCTP_FREE(param, SCTP_M_ASC_ADDR); 490 } 491 } 492 493 stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs, 494 stcb->asoc.local_hmacs); 495 if (op_err) { 496 sctp_queue_op_err(stcb, op_err); 497 /* queuing will steal away the mbuf chain to the out queue */ 498 op_err = NULL; 499 } 500 /* extract the cookie and queue it to "echo" it back... */ 501 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 502 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 503 stcb->asoc.overall_error_count, 504 0, 505 SCTP_FROM_SCTP_INPUT, 506 __LINE__); 507 } 508 509 /* 510 * Cancel the INIT timer, We do this first before queueing the 511 * cookie. We always cancel at the primary to assume that we are 512 * canceling the timer started by the INIT which always goes to the 513 * primary. 514 */ 515 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb, 516 asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3); 517 518 /* calculate the RTO */ 519 if (asoc->overall_error_count == 0) { 520 sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, 521 SCTP_RTT_FROM_NON_DATA); 522 } 523 stcb->asoc.overall_error_count = 0; 524 net->error_count = 0; 525 retval = sctp_send_cookie_echo(m, offset, initack_limit, stcb, net); 526 return (retval); 527 } 528 529 static void 530 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp, 531 struct sctp_tcb *stcb, struct sctp_nets *net) 532 { 533 union sctp_sockstore store; 534 struct sctp_nets *r_net, *f_net; 535 struct timeval tv; 536 int req_prim = 0; 537 uint16_t old_error_counter; 538 539 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) { 540 /* Invalid length */ 541 return; 542 } 543 544 memset(&store, 0, sizeof(store)); 545 switch (cp->heartbeat.hb_info.addr_family) { 546 #ifdef INET 547 case AF_INET: 548 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) { 549 store.sin.sin_family = cp->heartbeat.hb_info.addr_family; 550 store.sin.sin_len = cp->heartbeat.hb_info.addr_len; 551 store.sin.sin_port = stcb->rport; 552 memcpy(&store.sin.sin_addr, cp->heartbeat.hb_info.address, 553 sizeof(store.sin.sin_addr)); 554 } else { 555 return; 556 } 557 break; 558 #endif 559 #ifdef INET6 560 case AF_INET6: 561 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) { 562 store.sin6.sin6_family = cp->heartbeat.hb_info.addr_family; 563 store.sin6.sin6_len = cp->heartbeat.hb_info.addr_len; 564 store.sin6.sin6_port = stcb->rport; 565 memcpy(&store.sin6.sin6_addr, cp->heartbeat.hb_info.address, sizeof(struct in6_addr)); 566 } else { 567 return; 568 } 569 break; 570 #endif 571 default: 572 return; 573 } 574 r_net = sctp_findnet(stcb, &store.sa); 575 if (r_net == NULL) { 576 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n"); 577 return; 578 } 579 if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) && 580 (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) && 581 (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) { 582 /* 583 * If the its a HB and it's random value is correct when can 584 * confirm the destination. 585 */ 586 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 587 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) { 588 stcb->asoc.primary_destination = r_net; 589 r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY; 590 f_net = TAILQ_FIRST(&stcb->asoc.nets); 591 if (f_net != r_net) { 592 /* 593 * first one on the list is NOT the primary 594 * sctp_cmpaddr() is much more efficient if 595 * the primary is the first on the list, 596 * make it so. 597 */ 598 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next); 599 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next); 600 } 601 req_prim = 1; 602 } 603 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 604 stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 605 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, 606 r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4); 607 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 608 } 609 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 610 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 611 stcb->asoc.overall_error_count, 612 0, 613 SCTP_FROM_SCTP_INPUT, 614 __LINE__); 615 } 616 stcb->asoc.overall_error_count = 0; 617 old_error_counter = r_net->error_count; 618 r_net->error_count = 0; 619 r_net->hb_responded = 1; 620 tv.tv_sec = cp->heartbeat.hb_info.time_value_1; 621 tv.tv_usec = cp->heartbeat.hb_info.time_value_2; 622 /* Now lets do a RTO with this */ 623 sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, 624 SCTP_RTT_FROM_NON_DATA); 625 if ((r_net->dest_state & SCTP_ADDR_REACHABLE) == 0) { 626 r_net->dest_state |= SCTP_ADDR_REACHABLE; 627 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb, 628 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 629 } 630 if (r_net->dest_state & SCTP_ADDR_PF) { 631 r_net->dest_state &= ~SCTP_ADDR_PF; 632 stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net); 633 } 634 if (old_error_counter > 0) { 635 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 636 stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_5); 637 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 638 } 639 if (r_net == stcb->asoc.primary_destination) { 640 if (stcb->asoc.alternate) { 641 /* release the alternate, primary is good */ 642 sctp_free_remote_addr(stcb->asoc.alternate); 643 stcb->asoc.alternate = NULL; 644 } 645 } 646 /* Mobility adaptation */ 647 if (req_prim) { 648 if ((sctp_is_mobility_feature_on(stcb->sctp_ep, 649 SCTP_MOBILITY_BASE) || 650 sctp_is_mobility_feature_on(stcb->sctp_ep, 651 SCTP_MOBILITY_FASTHANDOFF)) && 652 sctp_is_mobility_feature_on(stcb->sctp_ep, 653 SCTP_MOBILITY_PRIM_DELETED)) { 654 sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED, 655 stcb->sctp_ep, stcb, NULL, 656 SCTP_FROM_SCTP_INPUT + SCTP_LOC_6); 657 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 658 SCTP_MOBILITY_FASTHANDOFF)) { 659 sctp_assoc_immediate_retrans(stcb, 660 stcb->asoc.primary_destination); 661 } 662 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 663 SCTP_MOBILITY_BASE)) { 664 sctp_move_chunks_from_net(stcb, 665 stcb->asoc.deleted_primary); 666 } 667 sctp_delete_prim_timer(stcb->sctp_ep, stcb); 668 } 669 } 670 } 671 672 static int 673 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb) 674 { 675 /* 676 * Return 0 means we want you to proceed with the abort non-zero 677 * means no abort processing. 678 */ 679 uint32_t new_vtag; 680 struct sctpasochead *head; 681 682 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || 683 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 684 atomic_add_int(&stcb->asoc.refcnt, 1); 685 SCTP_TCB_UNLOCK(stcb); 686 SCTP_INP_INFO_WLOCK(); 687 SCTP_TCB_LOCK(stcb); 688 atomic_subtract_int(&stcb->asoc.refcnt, 1); 689 } else { 690 return (0); 691 } 692 new_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 693 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) { 694 /* generate a new vtag and send init */ 695 LIST_REMOVE(stcb, sctp_asocs); 696 stcb->asoc.my_vtag = new_vtag; 697 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 698 /* 699 * put it in the bucket in the vtag hash of assoc's for the 700 * system 701 */ 702 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 703 SCTP_INP_INFO_WUNLOCK(); 704 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 705 return (1); 706 } else { 707 /* 708 * treat like a case where the cookie expired i.e.: - dump 709 * current cookie. - generate a new vtag. - resend init. 710 */ 711 /* generate a new vtag and send init */ 712 LIST_REMOVE(stcb, sctp_asocs); 713 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT); 714 sctp_stop_all_cookie_timers(stcb); 715 sctp_toss_old_cookies(stcb, &stcb->asoc); 716 stcb->asoc.my_vtag = new_vtag; 717 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 718 /* 719 * put it in the bucket in the vtag hash of assoc's for the 720 * system 721 */ 722 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 723 SCTP_INP_INFO_WUNLOCK(); 724 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 725 return (1); 726 } 727 return (0); 728 } 729 730 static int 731 sctp_handle_nat_missing_state(struct sctp_tcb *stcb, 732 struct sctp_nets *net) 733 { 734 /* 735 * return 0 means we want you to proceed with the abort non-zero 736 * means no abort processing 737 */ 738 if (stcb->asoc.auth_supported == 0) { 739 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n"); 740 return (0); 741 } 742 sctp_asconf_send_nat_state_update(stcb, net); 743 return (1); 744 } 745 746 /* Returns 1 if the stcb was aborted, 0 otherwise */ 747 static int 748 sctp_handle_abort(struct sctp_abort_chunk *abort, 749 struct sctp_tcb *stcb, struct sctp_nets *net) 750 { 751 uint16_t len; 752 uint16_t error; 753 754 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n"); 755 if (stcb == NULL) 756 return (0); 757 758 len = ntohs(abort->ch.chunk_length); 759 if (len >= sizeof(struct sctp_chunkhdr) + sizeof(struct sctp_error_cause)) { 760 /* 761 * Need to check the cause codes for our two magic nat 762 * aborts which don't kill the assoc necessarily. 763 */ 764 struct sctp_error_cause *cause; 765 766 cause = (struct sctp_error_cause *)(abort + 1); 767 error = ntohs(cause->code); 768 if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) { 769 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state, ABORT flags:%x\n", 770 abort->ch.chunk_flags); 771 if (sctp_handle_nat_colliding_state(stcb)) { 772 return (0); 773 } 774 } else if (error == SCTP_CAUSE_NAT_MISSING_STATE) { 775 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state, ABORT flags:%x\n", 776 abort->ch.chunk_flags); 777 if (sctp_handle_nat_missing_state(stcb, net)) { 778 return (0); 779 } 780 } 781 } else { 782 error = 0; 783 } 784 /* stop any receive timers */ 785 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, NULL, 786 SCTP_FROM_SCTP_INPUT + SCTP_LOC_7); 787 /* notify user of the abort and clean up... */ 788 sctp_abort_notification(stcb, true, false, error, abort, SCTP_SO_NOT_LOCKED); 789 /* free the tcb */ 790 SCTP_STAT_INCR_COUNTER32(sctps_aborted); 791 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) || 792 (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 793 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 794 } 795 #ifdef SCTP_ASOCLOG_OF_TSNS 796 sctp_print_out_track_log(stcb); 797 #endif 798 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 799 SCTP_FROM_SCTP_INPUT + SCTP_LOC_8); 800 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n"); 801 return (1); 802 } 803 804 static void 805 sctp_start_net_timers(struct sctp_tcb *stcb) 806 { 807 uint32_t cnt_hb_sent; 808 struct sctp_nets *net; 809 810 cnt_hb_sent = 0; 811 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 812 /* 813 * For each network start: 1) A pmtu timer. 2) A HB timer 3) 814 * If the dest in unconfirmed send a hb as well if under 815 * max_hb_burst have been sent. 816 */ 817 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net); 818 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net); 819 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) && 820 (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) { 821 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 822 cnt_hb_sent++; 823 } 824 } 825 if (cnt_hb_sent) { 826 sctp_chunk_output(stcb->sctp_ep, stcb, 827 SCTP_OUTPUT_FROM_COOKIE_ACK, 828 SCTP_SO_NOT_LOCKED); 829 } 830 } 831 832 static void 833 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp, 834 struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag) 835 { 836 struct sctp_association *asoc; 837 int some_on_streamwheel; 838 int old_state; 839 840 SCTPDBG(SCTP_DEBUG_INPUT2, 841 "sctp_handle_shutdown: handling SHUTDOWN\n"); 842 if (stcb == NULL) 843 return; 844 asoc = &stcb->asoc; 845 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || 846 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 847 return; 848 } 849 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) { 850 /* Shutdown NOT the expected size */ 851 return; 852 } 853 old_state = SCTP_GET_STATE(stcb); 854 sctp_update_acked(stcb, cp, abort_flag); 855 if (*abort_flag) { 856 return; 857 } 858 if (asoc->control_pdapi) { 859 /* 860 * With a normal shutdown we assume the end of last record. 861 */ 862 SCTP_INP_READ_LOCK(stcb->sctp_ep); 863 if (asoc->control_pdapi->on_strm_q) { 864 struct sctp_stream_in *strm; 865 866 strm = &asoc->strmin[asoc->control_pdapi->sinfo_stream]; 867 if (asoc->control_pdapi->on_strm_q == SCTP_ON_UNORDERED) { 868 /* Unordered */ 869 TAILQ_REMOVE(&strm->uno_inqueue, asoc->control_pdapi, next_instrm); 870 asoc->control_pdapi->on_strm_q = 0; 871 } else if (asoc->control_pdapi->on_strm_q == SCTP_ON_ORDERED) { 872 /* Ordered */ 873 TAILQ_REMOVE(&strm->inqueue, asoc->control_pdapi, next_instrm); 874 asoc->control_pdapi->on_strm_q = 0; 875 #ifdef INVARIANTS 876 } else { 877 panic("Unknown state on ctrl:%p on_strm_q:%d", 878 asoc->control_pdapi, 879 asoc->control_pdapi->on_strm_q); 880 #endif 881 } 882 } 883 asoc->control_pdapi->end_added = 1; 884 asoc->control_pdapi->pdapi_aborted = 1; 885 asoc->control_pdapi = NULL; 886 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 887 if (stcb->sctp_socket) { 888 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 889 } 890 } 891 /* goto SHUTDOWN_RECEIVED state to block new requests */ 892 if (stcb->sctp_socket) { 893 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) && 894 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) && 895 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT)) { 896 SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_RECEIVED); 897 /* 898 * notify upper layer that peer has initiated a 899 * shutdown 900 */ 901 sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 902 903 /* reset time */ 904 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 905 } 906 } 907 if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) { 908 /* 909 * stop the shutdown timer, since we WILL move to 910 * SHUTDOWN-ACK-SENT. 911 */ 912 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, 913 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9); 914 } 915 /* Now is there unsent data on a stream somewhere? */ 916 some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED); 917 918 if (!TAILQ_EMPTY(&asoc->send_queue) || 919 !TAILQ_EMPTY(&asoc->sent_queue) || 920 some_on_streamwheel) { 921 /* By returning we will push more data out */ 922 return; 923 } else { 924 /* no outstanding data to send, so move on... */ 925 /* send SHUTDOWN-ACK */ 926 /* move to SHUTDOWN-ACK-SENT state */ 927 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) || 928 (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 929 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 930 } 931 if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 932 SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_ACK_SENT); 933 sctp_stop_timers_for_shutdown(stcb); 934 sctp_send_shutdown_ack(stcb, net); 935 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, 936 stcb->sctp_ep, stcb, net); 937 } else if (old_state == SCTP_STATE_SHUTDOWN_ACK_SENT) { 938 sctp_send_shutdown_ack(stcb, net); 939 } 940 } 941 } 942 943 static void 944 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED, 945 struct sctp_tcb *stcb, 946 struct sctp_nets *net) 947 { 948 struct sctp_association *asoc; 949 950 SCTPDBG(SCTP_DEBUG_INPUT2, 951 "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n"); 952 if (stcb == NULL) 953 return; 954 955 asoc = &stcb->asoc; 956 /* process according to association state */ 957 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || 958 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 959 /* unexpected SHUTDOWN-ACK... do OOTB handling... */ 960 sctp_send_shutdown_complete(stcb, net, 1); 961 SCTP_TCB_UNLOCK(stcb); 962 return; 963 } 964 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) && 965 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) { 966 /* unexpected SHUTDOWN-ACK... so ignore... */ 967 SCTP_TCB_UNLOCK(stcb); 968 return; 969 } 970 if (asoc->control_pdapi) { 971 /* 972 * With a normal shutdown we assume the end of last record. 973 */ 974 SCTP_INP_READ_LOCK(stcb->sctp_ep); 975 asoc->control_pdapi->end_added = 1; 976 asoc->control_pdapi->pdapi_aborted = 1; 977 asoc->control_pdapi = NULL; 978 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 979 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 980 } 981 #ifdef INVARIANTS 982 if (!TAILQ_EMPTY(&asoc->send_queue) || 983 !TAILQ_EMPTY(&asoc->sent_queue) || 984 sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) { 985 panic("Queues are not empty when handling SHUTDOWN-ACK"); 986 } 987 #endif 988 /* stop the timer */ 989 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, 990 SCTP_FROM_SCTP_INPUT + SCTP_LOC_10); 991 /* send SHUTDOWN-COMPLETE */ 992 sctp_send_shutdown_complete(stcb, net, 0); 993 /* notify upper layer protocol */ 994 if (stcb->sctp_socket) { 995 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 996 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 997 SCTP_SB_CLEAR(stcb->sctp_socket->so_snd); 998 } 999 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 1000 } 1001 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 1002 /* free the TCB but first save off the ep */ 1003 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1004 SCTP_FROM_SCTP_INPUT + SCTP_LOC_11); 1005 } 1006 1007 static void 1008 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, uint8_t chunk_type) 1009 { 1010 switch (chunk_type) { 1011 case SCTP_ASCONF_ACK: 1012 case SCTP_ASCONF: 1013 sctp_asconf_cleanup(stcb); 1014 break; 1015 case SCTP_IFORWARD_CUM_TSN: 1016 case SCTP_FORWARD_CUM_TSN: 1017 stcb->asoc.prsctp_supported = 0; 1018 break; 1019 default: 1020 SCTPDBG(SCTP_DEBUG_INPUT2, 1021 "Peer does not support chunk type %d (0x%x).\n", 1022 chunk_type, chunk_type); 1023 break; 1024 } 1025 } 1026 1027 /* 1028 * Skip past the param header and then we will find the param that caused the 1029 * problem. There are a number of param's in a ASCONF OR the prsctp param 1030 * these will turn of specific features. 1031 * XXX: Is this the right thing to do? 1032 */ 1033 static void 1034 sctp_process_unrecog_param(struct sctp_tcb *stcb, uint16_t parameter_type) 1035 { 1036 switch (parameter_type) { 1037 /* pr-sctp draft */ 1038 case SCTP_PRSCTP_SUPPORTED: 1039 stcb->asoc.prsctp_supported = 0; 1040 break; 1041 case SCTP_SUPPORTED_CHUNK_EXT: 1042 break; 1043 /* draft-ietf-tsvwg-addip-sctp */ 1044 case SCTP_HAS_NAT_SUPPORT: 1045 stcb->asoc.peer_supports_nat = 0; 1046 break; 1047 case SCTP_ADD_IP_ADDRESS: 1048 case SCTP_DEL_IP_ADDRESS: 1049 case SCTP_SET_PRIM_ADDR: 1050 stcb->asoc.asconf_supported = 0; 1051 break; 1052 case SCTP_SUCCESS_REPORT: 1053 case SCTP_ERROR_CAUSE_IND: 1054 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n"); 1055 SCTPDBG(SCTP_DEBUG_INPUT2, 1056 "Turning off ASCONF to this strange peer\n"); 1057 stcb->asoc.asconf_supported = 0; 1058 break; 1059 default: 1060 SCTPDBG(SCTP_DEBUG_INPUT2, 1061 "Peer does not support param type %d (0x%x)??\n", 1062 parameter_type, parameter_type); 1063 break; 1064 } 1065 } 1066 1067 static int 1068 sctp_handle_error(struct sctp_chunkhdr *ch, 1069 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 1070 { 1071 struct sctp_error_cause *cause; 1072 struct sctp_association *asoc; 1073 uint32_t remaining_length, adjust; 1074 uint16_t code, cause_code, cause_length; 1075 1076 /* parse through all of the errors and process */ 1077 asoc = &stcb->asoc; 1078 cause = (struct sctp_error_cause *)((caddr_t)ch + 1079 sizeof(struct sctp_chunkhdr)); 1080 remaining_length = ntohs(ch->chunk_length); 1081 if (remaining_length > limit) { 1082 remaining_length = limit; 1083 } 1084 if (remaining_length >= sizeof(struct sctp_chunkhdr)) { 1085 remaining_length -= sizeof(struct sctp_chunkhdr); 1086 } else { 1087 remaining_length = 0; 1088 } 1089 code = 0; 1090 while (remaining_length >= sizeof(struct sctp_error_cause)) { 1091 /* Process an Error Cause */ 1092 cause_code = ntohs(cause->code); 1093 cause_length = ntohs(cause->length); 1094 if ((cause_length > remaining_length) || (cause_length == 0)) { 1095 /* Invalid cause length, possibly due to truncation. */ 1096 SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in cause - bytes left: %u cause length: %u\n", 1097 remaining_length, cause_length); 1098 return (0); 1099 } 1100 if (code == 0) { 1101 /* report the first error cause */ 1102 code = cause_code; 1103 } 1104 switch (cause_code) { 1105 case SCTP_CAUSE_INVALID_STREAM: 1106 case SCTP_CAUSE_MISSING_PARAM: 1107 case SCTP_CAUSE_INVALID_PARAM: 1108 case SCTP_CAUSE_NO_USER_DATA: 1109 SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %u back? We have a bug :/ (or do they?)\n", 1110 cause_code); 1111 break; 1112 case SCTP_CAUSE_NAT_COLLIDING_STATE: 1113 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state, ERROR flags: %x\n", 1114 ch->chunk_flags); 1115 if (sctp_handle_nat_colliding_state(stcb)) { 1116 return (0); 1117 } 1118 break; 1119 case SCTP_CAUSE_NAT_MISSING_STATE: 1120 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state, ERROR flags: %x\n", 1121 ch->chunk_flags); 1122 if (sctp_handle_nat_missing_state(stcb, net)) { 1123 return (0); 1124 } 1125 break; 1126 case SCTP_CAUSE_STALE_COOKIE: 1127 /* 1128 * We only act if we have echoed a cookie and are 1129 * waiting. 1130 */ 1131 if ((cause_length >= sizeof(struct sctp_error_stale_cookie)) && 1132 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 1133 struct timeval now; 1134 struct sctp_error_stale_cookie *stale_cookie; 1135 uint64_t stale_time; 1136 1137 asoc->stale_cookie_count++; 1138 if (asoc->stale_cookie_count > asoc->max_init_times) { 1139 sctp_abort_notification(stcb, false, true, 0, NULL, SCTP_SO_NOT_LOCKED); 1140 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1141 SCTP_FROM_SCTP_INPUT + SCTP_LOC_12); 1142 return (-1); 1143 } 1144 stale_cookie = (struct sctp_error_stale_cookie *)cause; 1145 stale_time = ntohl(stale_cookie->stale_time); 1146 if (stale_time == 0) { 1147 /* Use an RTT as an approximation. */ 1148 (void)SCTP_GETTIME_TIMEVAL(&now); 1149 timevalsub(&now, &asoc->time_entered); 1150 stale_time = (uint64_t)1000000 * (uint64_t)now.tv_sec + (uint64_t)now.tv_usec; 1151 if (stale_time == 0) { 1152 stale_time = 1; 1153 } 1154 } 1155 /* 1156 * stale_time is in usec, convert it to 1157 * msec. Round upwards, to ensure that it is 1158 * non-zero. 1159 */ 1160 stale_time = (stale_time + 999) / 1000; 1161 /* Double it, to be more robust on RTX. */ 1162 stale_time = 2 * stale_time; 1163 asoc->cookie_preserve_req = (uint32_t)stale_time; 1164 if (asoc->overall_error_count == 0) { 1165 sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, 1166 SCTP_RTT_FROM_NON_DATA); 1167 } 1168 asoc->overall_error_count = 0; 1169 /* Blast back to INIT state */ 1170 sctp_toss_old_cookies(stcb, &stcb->asoc); 1171 sctp_stop_all_cookie_timers(stcb); 1172 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT); 1173 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 1174 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 1175 } 1176 break; 1177 case SCTP_CAUSE_UNRESOLVABLE_ADDR: 1178 /* 1179 * Nothing we can do here, we don't do hostname 1180 * addresses so if the peer does not like my IPv6 1181 * (or IPv4 for that matter) it does not matter. If 1182 * they don't support that type of address, they can 1183 * NOT possibly get that packet type... i.e. with no 1184 * IPv6 you can't receive a IPv6 packet. so we can 1185 * safely ignore this one. If we ever added support 1186 * for HOSTNAME Addresses, then we would need to do 1187 * something here. 1188 */ 1189 break; 1190 case SCTP_CAUSE_UNRECOG_CHUNK: 1191 if (cause_length >= sizeof(struct sctp_error_unrecognized_chunk)) { 1192 struct sctp_error_unrecognized_chunk *unrec_chunk; 1193 1194 unrec_chunk = (struct sctp_error_unrecognized_chunk *)cause; 1195 sctp_process_unrecog_chunk(stcb, unrec_chunk->ch.chunk_type); 1196 } 1197 break; 1198 case SCTP_CAUSE_UNRECOG_PARAM: 1199 /* XXX: We only consider the first parameter */ 1200 if (cause_length >= sizeof(struct sctp_error_cause) + sizeof(struct sctp_paramhdr)) { 1201 struct sctp_paramhdr *unrec_parameter; 1202 1203 unrec_parameter = (struct sctp_paramhdr *)(cause + 1); 1204 sctp_process_unrecog_param(stcb, ntohs(unrec_parameter->param_type)); 1205 } 1206 break; 1207 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN: 1208 /* 1209 * We ignore this since the timer will drive out a 1210 * new cookie anyway and there timer will drive us 1211 * to send a SHUTDOWN_COMPLETE. We can't send one 1212 * here since we don't have their tag. 1213 */ 1214 break; 1215 case SCTP_CAUSE_DELETING_LAST_ADDR: 1216 case SCTP_CAUSE_RESOURCE_SHORTAGE: 1217 case SCTP_CAUSE_DELETING_SRC_ADDR: 1218 /* 1219 * We should NOT get these here, but in a 1220 * ASCONF-ACK. 1221 */ 1222 SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a error cause with code %u.\n", 1223 cause_code); 1224 break; 1225 case SCTP_CAUSE_OUT_OF_RESC: 1226 /* 1227 * And what, pray tell do we do with the fact that 1228 * the peer is out of resources? Not really sure we 1229 * could do anything but abort. I suspect this 1230 * should have came WITH an abort instead of in a 1231 * OP-ERROR. 1232 */ 1233 break; 1234 default: 1235 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown code 0x%x\n", 1236 cause_code); 1237 break; 1238 } 1239 adjust = SCTP_SIZE32(cause_length); 1240 if (remaining_length >= adjust) { 1241 remaining_length -= adjust; 1242 } else { 1243 remaining_length = 0; 1244 } 1245 cause = (struct sctp_error_cause *)((caddr_t)cause + adjust); 1246 } 1247 sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, code, ch, SCTP_SO_NOT_LOCKED); 1248 return (0); 1249 } 1250 1251 static int 1252 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset, 1253 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 1254 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 1255 struct sctp_nets *net, int *abort_no_unlock, 1256 uint8_t mflowtype, uint32_t mflowid, 1257 uint32_t vrf_id) 1258 { 1259 struct sctp_init_ack *init_ack; 1260 struct mbuf *op_err; 1261 1262 SCTPDBG(SCTP_DEBUG_INPUT2, 1263 "sctp_handle_init_ack: handling INIT-ACK\n"); 1264 1265 if (stcb == NULL) { 1266 SCTPDBG(SCTP_DEBUG_INPUT2, 1267 "sctp_handle_init_ack: TCB is null\n"); 1268 return (-1); 1269 } 1270 /* Only process the INIT-ACK chunk in COOKIE WAIT state. */ 1271 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) { 1272 init_ack = &cp->init; 1273 /* Validate parameters. */ 1274 if ((ntohl(init_ack->initiate_tag) == 0) || 1275 (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) || 1276 (ntohs(init_ack->num_inbound_streams) == 0) || 1277 (ntohs(init_ack->num_outbound_streams) == 0)) { 1278 /* One of the mandatory parameters is illegal. */ 1279 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1280 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1281 src, dst, sh, op_err, 1282 mflowtype, mflowid, 1283 vrf_id, net->port); 1284 *abort_no_unlock = 1; 1285 return (-1); 1286 } 1287 if (stcb->asoc.primary_destination->dest_state & 1288 SCTP_ADDR_UNCONFIRMED) { 1289 /* 1290 * The primary is where we sent the INIT, we can 1291 * always consider it confirmed when the INIT-ACK is 1292 * returned. Do this before we load addresses 1293 * though. 1294 */ 1295 stcb->asoc.primary_destination->dest_state &= 1296 ~SCTP_ADDR_UNCONFIRMED; 1297 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 1298 stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED); 1299 } 1300 if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb, 1301 net, abort_no_unlock, 1302 mflowtype, mflowid, 1303 vrf_id) < 0) { 1304 /* error in parsing parameters */ 1305 return (-1); 1306 } 1307 /* Update our state. */ 1308 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n"); 1309 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_ECHOED); 1310 1311 /* Reset the RTO calculation. */ 1312 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 1313 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 1314 stcb->asoc.overall_error_count, 1315 0, 1316 SCTP_FROM_SCTP_INPUT, 1317 __LINE__); 1318 } 1319 stcb->asoc.overall_error_count = 0; 1320 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 1321 /* 1322 * Collapse the init timer back in case of a exponential 1323 * backoff. 1324 */ 1325 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep, 1326 stcb, net); 1327 /* 1328 * The output routine at the end of the inbound data 1329 * processing will cause the cookie to be sent. 1330 */ 1331 SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n"); 1332 return (0); 1333 } else { 1334 return (-1); 1335 } 1336 } 1337 1338 static struct sctp_tcb * 1339 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1340 struct sockaddr *src, struct sockaddr *dst, 1341 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1342 struct sctp_inpcb *inp, struct sctp_nets **netp, 1343 struct sockaddr *init_src, int *notification, 1344 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1345 uint8_t mflowtype, uint32_t mflowid, 1346 uint32_t vrf_id, uint16_t port); 1347 1348 /* 1349 * handle a state cookie for an existing association m: input packet mbuf 1350 * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a 1351 * "split" mbuf and the cookie signature does not exist offset: offset into 1352 * mbuf to the cookie-echo chunk 1353 */ 1354 static struct sctp_tcb * 1355 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset, 1356 struct sockaddr *src, struct sockaddr *dst, 1357 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1358 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp, 1359 struct sockaddr *init_src, int *notification, 1360 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1361 uint8_t mflowtype, uint32_t mflowid, 1362 uint32_t vrf_id, uint16_t port) 1363 { 1364 struct sctp_association *asoc; 1365 struct sctp_init_chunk *init_cp, init_buf; 1366 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1367 struct sctp_asconf_addr *aparam, *naparam; 1368 struct sctp_asconf_ack *aack, *naack; 1369 struct sctp_tmit_chunk *chk, *nchk; 1370 struct sctp_stream_reset_list *strrst, *nstrrst; 1371 struct sctp_queued_to_read *sq, *nsq; 1372 struct sctp_nets *net; 1373 struct mbuf *op_err; 1374 int init_offset, initack_offset, i; 1375 int retval; 1376 int spec_flag = 0; 1377 uint32_t how_indx; 1378 #if defined(SCTP_DETAILED_STR_STATS) 1379 int j; 1380 #endif 1381 1382 net = *netp; 1383 /* I know that the TCB is non-NULL from the caller */ 1384 asoc = &stcb->asoc; 1385 for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) { 1386 if (asoc->cookie_how[how_indx] == 0) 1387 break; 1388 } 1389 if (how_indx < sizeof(asoc->cookie_how)) { 1390 asoc->cookie_how[how_indx] = 1; 1391 } 1392 if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 1393 /* SHUTDOWN came in after sending INIT-ACK */ 1394 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination); 1395 op_err = sctp_generate_cause(SCTP_CAUSE_COOKIE_IN_SHUTDOWN, ""); 1396 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 1397 mflowtype, mflowid, inp->fibnum, 1398 vrf_id, net->port); 1399 if (how_indx < sizeof(asoc->cookie_how)) 1400 asoc->cookie_how[how_indx] = 2; 1401 SCTP_TCB_UNLOCK(stcb); 1402 return (NULL); 1403 } 1404 /* 1405 * find and validate the INIT chunk in the cookie (peer's info) the 1406 * INIT should start after the cookie-echo header struct (chunk 1407 * header, state cookie header struct) 1408 */ 1409 init_offset = offset += sizeof(struct sctp_cookie_echo_chunk); 1410 1411 init_cp = (struct sctp_init_chunk *) 1412 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 1413 (uint8_t *)&init_buf); 1414 if (init_cp == NULL) { 1415 /* could not pull a INIT chunk in cookie */ 1416 SCTP_TCB_UNLOCK(stcb); 1417 return (NULL); 1418 } 1419 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 1420 SCTP_TCB_UNLOCK(stcb); 1421 return (NULL); 1422 } 1423 /* 1424 * find and validate the INIT-ACK chunk in the cookie (my info) the 1425 * INIT-ACK follows the INIT chunk 1426 */ 1427 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 1428 initack_cp = (struct sctp_init_ack_chunk *) 1429 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 1430 (uint8_t *)&initack_buf); 1431 if (initack_cp == NULL) { 1432 /* could not pull INIT-ACK chunk in cookie */ 1433 SCTP_TCB_UNLOCK(stcb); 1434 return (NULL); 1435 } 1436 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 1437 SCTP_TCB_UNLOCK(stcb); 1438 return (NULL); 1439 } 1440 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1441 (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) { 1442 /* 1443 * case D in Section 5.2.4 Table 2: MMAA process accordingly 1444 * to get into the OPEN state 1445 */ 1446 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1447 /*- 1448 * Opps, this means that we somehow generated two vtag's 1449 * the same. I.e. we did: 1450 * Us Peer 1451 * <---INIT(tag=a)------ 1452 * ----INIT-ACK(tag=t)--> 1453 * ----INIT(tag=t)------> *1 1454 * <---INIT-ACK(tag=a)--- 1455 * <----CE(tag=t)------------- *2 1456 * 1457 * At point *1 we should be generating a different 1458 * tag t'. Which means we would throw away the CE and send 1459 * ours instead. Basically this is case C (throw away side). 1460 */ 1461 if (how_indx < sizeof(asoc->cookie_how)) 1462 asoc->cookie_how[how_indx] = 17; 1463 SCTP_TCB_UNLOCK(stcb); 1464 return (NULL); 1465 } 1466 switch (SCTP_GET_STATE(stcb)) { 1467 case SCTP_STATE_COOKIE_WAIT: 1468 case SCTP_STATE_COOKIE_ECHOED: 1469 /* 1470 * INIT was sent but got a COOKIE_ECHO with the 1471 * correct tags... just accept it...but we must 1472 * process the init so that we can make sure we have 1473 * the right seq no's. 1474 */ 1475 /* First we must process the INIT !! */ 1476 if (sctp_process_init(init_cp, stcb) < 0) { 1477 if (how_indx < sizeof(asoc->cookie_how)) 1478 asoc->cookie_how[how_indx] = 3; 1479 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 1480 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_init() failed\n"); 1481 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1482 src, dst, sh, op_err, 1483 mflowtype, mflowid, 1484 vrf_id, net->port); 1485 return (NULL); 1486 } 1487 /* we have already processed the INIT so no problem */ 1488 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, 1489 stcb, net, 1490 SCTP_FROM_SCTP_INPUT + SCTP_LOC_13); 1491 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, 1492 stcb, net, 1493 SCTP_FROM_SCTP_INPUT + SCTP_LOC_14); 1494 /* update current state */ 1495 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) 1496 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1497 else 1498 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1499 1500 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 1501 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1502 sctp_stop_all_cookie_timers(stcb); 1503 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1504 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1505 (!SCTP_IS_LISTENING(inp))) { 1506 /* 1507 * Here is where collision would go if we 1508 * did a connect() and instead got a 1509 * init/init-ack/cookie done before the 1510 * init-ack came back.. 1511 */ 1512 sctp_pcb_add_flags(stcb->sctp_ep, SCTP_PCB_FLAGS_CONNECTED); 1513 soisconnected(stcb->sctp_socket); 1514 } 1515 /* notify upper layer */ 1516 *notification = SCTP_NOTIFY_ASSOC_UP; 1517 net->hb_responded = 1; 1518 if (stcb->asoc.sctp_autoclose_ticks && 1519 (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) { 1520 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 1521 inp, stcb, NULL); 1522 } 1523 break; 1524 default: 1525 /* 1526 * we're in the OPEN state (or beyond), so peer must 1527 * have simply lost the COOKIE-ACK 1528 */ 1529 break; 1530 } /* end switch */ 1531 sctp_stop_all_cookie_timers(stcb); 1532 if ((retval = sctp_load_addresses_from_init(stcb, m, 1533 init_offset + sizeof(struct sctp_init_chunk), 1534 initack_offset, src, dst, init_src, stcb->asoc.port)) < 0) { 1535 if (how_indx < sizeof(asoc->cookie_how)) 1536 asoc->cookie_how[how_indx] = 4; 1537 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 1538 "Problem with address parameters"); 1539 SCTPDBG(SCTP_DEBUG_INPUT1, 1540 "Load addresses from INIT causes an abort %d\n", 1541 retval); 1542 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1543 src, dst, sh, op_err, 1544 mflowtype, mflowid, 1545 vrf_id, net->port); 1546 return (NULL); 1547 } 1548 /* respond with a COOKIE-ACK */ 1549 sctp_toss_old_cookies(stcb, asoc); 1550 sctp_send_cookie_ack(stcb); 1551 if (how_indx < sizeof(asoc->cookie_how)) 1552 asoc->cookie_how[how_indx] = 5; 1553 return (stcb); 1554 } 1555 1556 if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1557 ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag && 1558 cookie->tie_tag_my_vtag == 0 && 1559 cookie->tie_tag_peer_vtag == 0) { 1560 /* 1561 * case C in Section 5.2.4 Table 2: XMOO silently discard 1562 */ 1563 if (how_indx < sizeof(asoc->cookie_how)) 1564 asoc->cookie_how[how_indx] = 6; 1565 SCTP_TCB_UNLOCK(stcb); 1566 return (NULL); 1567 } 1568 /* 1569 * If nat support, and the below and stcb is established, send back 1570 * a ABORT(colliding state) if we are established. 1571 */ 1572 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) && 1573 (asoc->peer_supports_nat) && 1574 ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1575 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1576 (asoc->peer_vtag == 0)))) { 1577 /* 1578 * Special case - Peer's support nat. We may have two init's 1579 * that we gave out the same tag on since one was not 1580 * established.. i.e. we get INIT from host-1 behind the nat 1581 * and we respond tag-a, we get a INIT from host-2 behind 1582 * the nat and we get tag-a again. Then we bring up host-1 1583 * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1). 1584 * Now we have colliding state. We must send an abort here 1585 * with colliding state indication. 1586 */ 1587 op_err = sctp_generate_cause(SCTP_CAUSE_NAT_COLLIDING_STATE, ""); 1588 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err, 1589 mflowtype, mflowid, inp->fibnum, 1590 vrf_id, port); 1591 SCTP_TCB_UNLOCK(stcb); 1592 return (NULL); 1593 } 1594 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1595 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1596 (asoc->peer_vtag == 0))) { 1597 /* 1598 * case B in Section 5.2.4 Table 2: MXAA or MOAA my info 1599 * should be ok, re-accept peer info 1600 */ 1601 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1602 /* 1603 * Extension of case C. If we hit this, then the 1604 * random number generator returned the same vtag 1605 * when we first sent our INIT-ACK and when we later 1606 * sent our INIT. The side with the seq numbers that 1607 * are different will be the one that normally would 1608 * have hit case C. This in effect "extends" our 1609 * vtags in this collision case to be 64 bits. The 1610 * same collision could occur aka you get both vtag 1611 * and seq number the same twice in a row.. but is 1612 * much less likely. If it did happen then we would 1613 * proceed through and bring up the assoc.. we may 1614 * end up with the wrong stream setup however.. 1615 * which would be bad.. but there is no way to 1616 * tell.. until we send on a stream that does not 1617 * exist :-) 1618 */ 1619 if (how_indx < sizeof(asoc->cookie_how)) 1620 asoc->cookie_how[how_indx] = 7; 1621 1622 SCTP_TCB_UNLOCK(stcb); 1623 return (NULL); 1624 } 1625 if (how_indx < sizeof(asoc->cookie_how)) 1626 asoc->cookie_how[how_indx] = 8; 1627 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, 1628 SCTP_FROM_SCTP_INPUT + SCTP_LOC_15); 1629 sctp_stop_all_cookie_timers(stcb); 1630 /* 1631 * since we did not send a HB make sure we don't double 1632 * things 1633 */ 1634 net->hb_responded = 1; 1635 if (stcb->asoc.sctp_autoclose_ticks && 1636 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 1637 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, 1638 NULL); 1639 } 1640 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1641 if (asoc->pre_open_streams < asoc->streamoutcnt) { 1642 asoc->pre_open_streams = asoc->streamoutcnt; 1643 } 1644 1645 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) { 1646 /* 1647 * Ok the peer probably discarded our data (if we 1648 * echoed a cookie+data). So anything on the 1649 * sent_queue should be marked for retransmit, we 1650 * may not get something to kick us so it COULD 1651 * still take a timeout to move these.. but it can't 1652 * hurt to mark them. 1653 */ 1654 1655 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 1656 if (chk->sent < SCTP_DATAGRAM_RESEND) { 1657 chk->sent = SCTP_DATAGRAM_RESEND; 1658 sctp_flight_size_decrease(chk); 1659 sctp_total_flight_decrease(stcb, chk); 1660 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 1661 spec_flag++; 1662 } 1663 } 1664 } 1665 /* process the INIT info (peer's info) */ 1666 if (sctp_process_init(init_cp, stcb) < 0) { 1667 if (how_indx < sizeof(asoc->cookie_how)) 1668 asoc->cookie_how[how_indx] = 9; 1669 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 1670 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_init() failed\n"); 1671 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1672 src, dst, sh, op_err, 1673 mflowtype, mflowid, 1674 vrf_id, net->port); 1675 return (NULL); 1676 } 1677 if ((retval = sctp_load_addresses_from_init(stcb, m, 1678 init_offset + sizeof(struct sctp_init_chunk), 1679 initack_offset, src, dst, init_src, stcb->asoc.port)) < 0) { 1680 if (how_indx < sizeof(asoc->cookie_how)) 1681 asoc->cookie_how[how_indx] = 10; 1682 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 1683 "Problem with address parameters"); 1684 SCTPDBG(SCTP_DEBUG_INPUT1, 1685 "Load addresses from INIT causes an abort %d\n", 1686 retval); 1687 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1688 src, dst, sh, op_err, 1689 mflowtype, mflowid, 1690 vrf_id, net->port); 1691 return (NULL); 1692 } 1693 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || 1694 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 1695 *notification = SCTP_NOTIFY_ASSOC_UP; 1696 1697 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1698 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1699 (!SCTP_IS_LISTENING(inp))) { 1700 sctp_pcb_add_flags(stcb->sctp_ep, SCTP_PCB_FLAGS_CONNECTED); 1701 soisconnected(stcb->sctp_socket); 1702 } 1703 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) 1704 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1705 else 1706 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1707 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1708 } else if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) { 1709 SCTP_STAT_INCR_COUNTER32(sctps_restartestab); 1710 } else { 1711 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1712 } 1713 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 1714 sctp_stop_all_cookie_timers(stcb); 1715 sctp_toss_old_cookies(stcb, asoc); 1716 sctp_send_cookie_ack(stcb); 1717 if (spec_flag) { 1718 /* 1719 * only if we have retrans set do we do this. What 1720 * this call does is get only the COOKIE-ACK out and 1721 * then when we return the normal call to 1722 * sctp_chunk_output will get the retrans out behind 1723 * this. 1724 */ 1725 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED); 1726 } 1727 if (how_indx < sizeof(asoc->cookie_how)) 1728 asoc->cookie_how[how_indx] = 11; 1729 1730 return (stcb); 1731 } 1732 if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1733 ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) && 1734 cookie->tie_tag_my_vtag == asoc->my_vtag_nonce && 1735 cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce && 1736 cookie->tie_tag_peer_vtag != 0) { 1737 struct sctpasochead *head; 1738 1739 if (asoc->peer_supports_nat) { 1740 struct sctp_tcb *local_stcb; 1741 1742 /* 1743 * This is a gross gross hack. Just call the 1744 * cookie_new code since we are allowing a duplicate 1745 * association. I hope this works... 1746 */ 1747 local_stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, 1748 sh, cookie, cookie_len, 1749 inp, netp, init_src, notification, 1750 auth_skipped, auth_offset, auth_len, 1751 mflowtype, mflowid, 1752 vrf_id, port); 1753 if (local_stcb == NULL) { 1754 SCTP_TCB_UNLOCK(stcb); 1755 } 1756 return (local_stcb); 1757 } 1758 /* 1759 * case A in Section 5.2.4 Table 2: XXMM (peer restarted) 1760 */ 1761 /* temp code */ 1762 if (how_indx < sizeof(asoc->cookie_how)) 1763 asoc->cookie_how[how_indx] = 12; 1764 sctp_stop_association_timers(stcb, false); 1765 /* notify upper layer */ 1766 *notification = SCTP_NOTIFY_ASSOC_RESTART; 1767 atomic_add_int(&stcb->asoc.refcnt, 1); 1768 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_OPEN) && 1769 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) && 1770 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT)) { 1771 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1772 } 1773 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) { 1774 SCTP_STAT_INCR_GAUGE32(sctps_restartestab); 1775 } else if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) { 1776 SCTP_STAT_INCR_GAUGE32(sctps_collisionestab); 1777 } 1778 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1779 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 1780 1781 } else if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) { 1782 /* move to OPEN state, if not in SHUTDOWN_SENT */ 1783 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 1784 } 1785 if (asoc->pre_open_streams < asoc->streamoutcnt) { 1786 asoc->pre_open_streams = asoc->streamoutcnt; 1787 } 1788 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 1789 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 1790 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 1791 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 1792 asoc->str_reset_seq_in = asoc->init_seq_number; 1793 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 1794 asoc->send_sack = 1; 1795 asoc->data_pkts_seen = 0; 1796 asoc->last_data_chunk_from = NULL; 1797 asoc->last_control_chunk_from = NULL; 1798 asoc->last_net_cmt_send_started = NULL; 1799 if (asoc->mapping_array) { 1800 memset(asoc->mapping_array, 0, 1801 asoc->mapping_array_size); 1802 } 1803 if (asoc->nr_mapping_array) { 1804 memset(asoc->nr_mapping_array, 0, 1805 asoc->mapping_array_size); 1806 } 1807 SCTP_TCB_UNLOCK(stcb); 1808 SCTP_INP_INFO_WLOCK(); 1809 SCTP_INP_WLOCK(stcb->sctp_ep); 1810 SCTP_TCB_LOCK(stcb); 1811 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1812 /* send up all the data */ 1813 sctp_report_all_outbound(stcb, 0, SCTP_SO_LOCKED); 1814 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 1815 stcb->asoc.strmout[i].chunks_on_queues = 0; 1816 #if defined(SCTP_DETAILED_STR_STATS) 1817 for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) { 1818 asoc->strmout[i].abandoned_sent[j] = 0; 1819 asoc->strmout[i].abandoned_unsent[j] = 0; 1820 } 1821 #else 1822 asoc->strmout[i].abandoned_sent[0] = 0; 1823 asoc->strmout[i].abandoned_unsent[0] = 0; 1824 #endif 1825 stcb->asoc.strmout[i].next_mid_ordered = 0; 1826 stcb->asoc.strmout[i].next_mid_unordered = 0; 1827 stcb->asoc.strmout[i].sid = i; 1828 stcb->asoc.strmout[i].last_msg_incomplete = 0; 1829 } 1830 TAILQ_FOREACH_SAFE(strrst, &asoc->resetHead, next_resp, nstrrst) { 1831 TAILQ_REMOVE(&asoc->resetHead, strrst, next_resp); 1832 SCTP_FREE(strrst, SCTP_M_STRESET); 1833 } 1834 TAILQ_FOREACH_SAFE(sq, &asoc->pending_reply_queue, next, nsq) { 1835 TAILQ_REMOVE(&asoc->pending_reply_queue, sq, next); 1836 if (sq->data) { 1837 sctp_m_freem(sq->data); 1838 sq->data = NULL; 1839 } 1840 sctp_free_remote_addr(sq->whoFrom); 1841 sq->whoFrom = NULL; 1842 sq->stcb = NULL; 1843 sctp_free_a_readq(stcb, sq); 1844 } 1845 TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) { 1846 TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next); 1847 if (chk->data) { 1848 sctp_m_freem(chk->data); 1849 chk->data = NULL; 1850 } 1851 if (chk->holds_key_ref) 1852 sctp_auth_key_release(stcb, chk->auth_keyid, SCTP_SO_LOCKED); 1853 sctp_free_remote_addr(chk->whoTo); 1854 SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_chunk), chk); 1855 SCTP_DECR_CHK_COUNT(); 1856 } 1857 asoc->ctrl_queue_cnt = 0; 1858 asoc->str_reset = NULL; 1859 asoc->stream_reset_outstanding = 0; 1860 TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) { 1861 TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next); 1862 if (chk->data) { 1863 sctp_m_freem(chk->data); 1864 chk->data = NULL; 1865 } 1866 if (chk->holds_key_ref) 1867 sctp_auth_key_release(stcb, chk->auth_keyid, SCTP_SO_LOCKED); 1868 sctp_free_remote_addr(chk->whoTo); 1869 SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_chunk), chk); 1870 SCTP_DECR_CHK_COUNT(); 1871 } 1872 TAILQ_FOREACH_SAFE(aparam, &asoc->asconf_queue, next, naparam) { 1873 TAILQ_REMOVE(&asoc->asconf_queue, aparam, next); 1874 SCTP_FREE(aparam, SCTP_M_ASC_ADDR); 1875 } 1876 TAILQ_FOREACH_SAFE(aack, &asoc->asconf_ack_sent, next, naack) { 1877 TAILQ_REMOVE(&asoc->asconf_ack_sent, aack, next); 1878 if (aack->data != NULL) { 1879 sctp_m_freem(aack->data); 1880 } 1881 SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_asconf_ack), aack); 1882 } 1883 asoc->rcv_edmid = cookie->rcv_edmid; 1884 1885 /* process the INIT-ACK info (my info) */ 1886 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 1887 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1888 1889 /* pull from vtag hash */ 1890 LIST_REMOVE(stcb, sctp_asocs); 1891 /* re-insert to new vtag position */ 1892 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, 1893 SCTP_BASE_INFO(hashasocmark))]; 1894 /* 1895 * put it in the bucket in the vtag hash of assoc's for the 1896 * system 1897 */ 1898 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 1899 1900 SCTP_INP_WUNLOCK(stcb->sctp_ep); 1901 SCTP_INP_INFO_WUNLOCK(); 1902 asoc->total_flight = 0; 1903 asoc->total_flight_count = 0; 1904 /* process the INIT info (peer's info) */ 1905 if (sctp_process_init(init_cp, stcb) < 0) { 1906 if (how_indx < sizeof(asoc->cookie_how)) 1907 asoc->cookie_how[how_indx] = 13; 1908 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 1909 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_init() failed\n"); 1910 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1911 src, dst, sh, op_err, 1912 mflowtype, mflowid, 1913 vrf_id, net->port); 1914 return (NULL); 1915 } 1916 /* 1917 * since we did not send a HB make sure we don't double 1918 * things 1919 */ 1920 net->hb_responded = 1; 1921 1922 if ((retval = sctp_load_addresses_from_init(stcb, m, 1923 init_offset + sizeof(struct sctp_init_chunk), 1924 initack_offset, src, dst, init_src, stcb->asoc.port)) < 0) { 1925 if (how_indx < sizeof(asoc->cookie_how)) 1926 asoc->cookie_how[how_indx] = 14; 1927 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 1928 "Problem with address parameters"); 1929 SCTPDBG(SCTP_DEBUG_INPUT1, 1930 "Load addresses from INIT causes an abort %d\n", 1931 retval); 1932 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1933 src, dst, sh, op_err, 1934 mflowtype, mflowid, 1935 vrf_id, net->port); 1936 return (NULL); 1937 } 1938 /* respond with a COOKIE-ACK */ 1939 sctp_send_cookie_ack(stcb); 1940 if (how_indx < sizeof(asoc->cookie_how)) 1941 asoc->cookie_how[how_indx] = 15; 1942 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE) && 1943 (asoc->sctp_autoclose_ticks > 0)) { 1944 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL); 1945 } 1946 return (stcb); 1947 } 1948 if (how_indx < sizeof(asoc->cookie_how)) 1949 asoc->cookie_how[how_indx] = 16; 1950 /* all other cases... */ 1951 SCTP_TCB_UNLOCK(stcb); 1952 return (NULL); 1953 } 1954 1955 /* 1956 * handle a state cookie for a new association m: input packet mbuf chain-- 1957 * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf 1958 * and the cookie signature does not exist offset: offset into mbuf to the 1959 * cookie-echo chunk length: length of the cookie chunk to: where the init 1960 * was from returns a new TCB 1961 */ 1962 static struct sctp_tcb * 1963 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1964 struct sockaddr *src, struct sockaddr *dst, 1965 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1966 struct sctp_inpcb *inp, struct sctp_nets **netp, 1967 struct sockaddr *init_src, int *notification, 1968 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1969 uint8_t mflowtype, uint32_t mflowid, 1970 uint32_t vrf_id, uint16_t port) 1971 { 1972 struct sctp_tcb *stcb; 1973 struct sctp_init_chunk *init_cp, init_buf; 1974 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1975 union sctp_sockstore store; 1976 struct sctp_association *asoc; 1977 int init_offset, initack_offset, initack_limit; 1978 int error = 0; 1979 uint8_t auth_chunk_buf[SCTP_CHUNK_BUFFER_SIZE]; 1980 1981 /* 1982 * find and validate the INIT chunk in the cookie (peer's info) the 1983 * INIT should start after the cookie-echo header struct (chunk 1984 * header, state cookie header struct) 1985 */ 1986 init_offset = offset + sizeof(struct sctp_cookie_echo_chunk); 1987 init_cp = (struct sctp_init_chunk *) 1988 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 1989 (uint8_t *)&init_buf); 1990 if (init_cp == NULL) { 1991 /* could not pull a INIT chunk in cookie */ 1992 SCTPDBG(SCTP_DEBUG_INPUT1, 1993 "process_cookie_new: could not pull INIT chunk hdr\n"); 1994 return (NULL); 1995 } 1996 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 1997 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n"); 1998 return (NULL); 1999 } 2000 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 2001 /* 2002 * find and validate the INIT-ACK chunk in the cookie (my info) the 2003 * INIT-ACK follows the INIT chunk 2004 */ 2005 initack_cp = (struct sctp_init_ack_chunk *) 2006 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 2007 (uint8_t *)&initack_buf); 2008 if (initack_cp == NULL) { 2009 /* could not pull INIT-ACK chunk in cookie */ 2010 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n"); 2011 return (NULL); 2012 } 2013 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 2014 return (NULL); 2015 } 2016 /* 2017 * NOTE: We can't use the INIT_ACK's chk_length to determine the 2018 * "initack_limit" value. This is because the chk_length field 2019 * includes the length of the cookie, but the cookie is omitted when 2020 * the INIT and INIT_ACK are tacked onto the cookie... 2021 */ 2022 initack_limit = offset + cookie_len; 2023 2024 /* 2025 * now that we know the INIT/INIT-ACK are in place, create a new TCB 2026 * and populate 2027 */ 2028 2029 /* 2030 * Here we do a trick, we set in NULL for the proc/thread argument. 2031 * We do this since in effect we only use the p argument when the 2032 * socket is unbound and we must do an implicit bind. Since we are 2033 * getting a cookie, we cannot be unbound. 2034 */ 2035 stcb = sctp_aloc_assoc(inp, init_src, &error, 2036 ntohl(initack_cp->init.initiate_tag), 2037 ntohl(initack_cp->init.initial_tsn), vrf_id, 2038 ntohs(initack_cp->init.num_outbound_streams), 2039 port, 2040 (struct thread *)NULL, 2041 SCTP_DONT_INITIALIZE_AUTH_PARAMS); 2042 if (stcb == NULL) { 2043 struct mbuf *op_err; 2044 2045 /* memory problem? */ 2046 SCTPDBG(SCTP_DEBUG_INPUT1, 2047 "process_cookie_new: no room for another TCB!\n"); 2048 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2049 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2050 src, dst, sh, op_err, 2051 mflowtype, mflowid, 2052 vrf_id, port); 2053 return (NULL); 2054 } 2055 asoc = &stcb->asoc; 2056 /* get scope variables out of cookie */ 2057 asoc->scope.ipv4_local_scope = cookie->ipv4_scope; 2058 asoc->scope.site_scope = cookie->site_scope; 2059 asoc->scope.local_scope = cookie->local_scope; 2060 asoc->scope.loopback_scope = cookie->loopback_scope; 2061 2062 if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) || 2063 (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) { 2064 struct mbuf *op_err; 2065 2066 /* 2067 * Houston we have a problem. The EP changed while the 2068 * cookie was in flight. Only recourse is to abort the 2069 * association. 2070 */ 2071 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2072 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2073 src, dst, sh, op_err, 2074 mflowtype, mflowid, 2075 vrf_id, port); 2076 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2077 SCTP_FROM_SCTP_INPUT + SCTP_LOC_18); 2078 return (NULL); 2079 } 2080 asoc->rcv_edmid = cookie->rcv_edmid; 2081 /* process the INIT-ACK info (my info) */ 2082 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 2083 2084 /* process the INIT info (peer's info) */ 2085 if (sctp_process_init(init_cp, stcb) < 0) { 2086 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2087 SCTP_FROM_SCTP_INPUT + SCTP_LOC_19); 2088 return (NULL); 2089 } 2090 /* load all addresses */ 2091 if (sctp_load_addresses_from_init(stcb, m, 2092 init_offset + sizeof(struct sctp_init_chunk), 2093 initack_offset, src, dst, init_src, port) < 0) { 2094 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2095 SCTP_FROM_SCTP_INPUT + SCTP_LOC_20); 2096 return (NULL); 2097 } 2098 /* 2099 * verify any preceding AUTH chunk that was skipped 2100 */ 2101 /* pull the local authentication parameters from the cookie/init-ack */ 2102 sctp_auth_get_cookie_params(stcb, m, 2103 initack_offset + sizeof(struct sctp_init_ack_chunk), 2104 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk))); 2105 if (auth_skipped) { 2106 struct sctp_auth_chunk *auth; 2107 2108 if (auth_len <= SCTP_CHUNK_BUFFER_SIZE) { 2109 auth = (struct sctp_auth_chunk *)sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf); 2110 } else { 2111 auth = NULL; 2112 } 2113 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) { 2114 /* auth HMAC failed, dump the assoc and packet */ 2115 SCTPDBG(SCTP_DEBUG_AUTH1, 2116 "COOKIE-ECHO: AUTH failed\n"); 2117 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2118 SCTP_FROM_SCTP_INPUT + SCTP_LOC_21); 2119 return (NULL); 2120 } else { 2121 /* remaining chunks checked... good to go */ 2122 stcb->asoc.authenticated = 1; 2123 } 2124 } 2125 2126 /* 2127 * if we're doing ASCONFs, check to see if we have any new local 2128 * addresses that need to get added to the peer (eg. addresses 2129 * changed while cookie echo in flight). This needs to be done 2130 * after we go to the OPEN state to do the correct asconf 2131 * processing. else, make sure we have the correct addresses in our 2132 * lists 2133 */ 2134 2135 /* warning, we re-use sin, sin6, sa_store here! */ 2136 /* pull in local_address (our "from" address) */ 2137 switch (cookie->laddr_type) { 2138 #ifdef INET 2139 case SCTP_IPV4_ADDRESS: 2140 /* source addr is IPv4 */ 2141 memset(&store.sin, 0, sizeof(struct sockaddr_in)); 2142 store.sin.sin_family = AF_INET; 2143 store.sin.sin_len = sizeof(struct sockaddr_in); 2144 store.sin.sin_addr.s_addr = cookie->laddress[0]; 2145 break; 2146 #endif 2147 #ifdef INET6 2148 case SCTP_IPV6_ADDRESS: 2149 /* source addr is IPv6 */ 2150 memset(&store.sin6, 0, sizeof(struct sockaddr_in6)); 2151 store.sin6.sin6_family = AF_INET6; 2152 store.sin6.sin6_len = sizeof(struct sockaddr_in6); 2153 store.sin6.sin6_scope_id = cookie->scope_id; 2154 memcpy(&store.sin6.sin6_addr, cookie->laddress, sizeof(struct in6_addr)); 2155 break; 2156 #endif 2157 default: 2158 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2159 SCTP_FROM_SCTP_INPUT + SCTP_LOC_22); 2160 return (NULL); 2161 } 2162 2163 /* update current state */ 2164 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2165 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 2166 sctp_stop_all_cookie_timers(stcb); 2167 SCTP_STAT_INCR_COUNTER32(sctps_passiveestab); 2168 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2169 2170 /* set up to notify upper layer */ 2171 *notification = SCTP_NOTIFY_ASSOC_UP; 2172 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2173 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 2174 (!SCTP_IS_LISTENING(inp))) { 2175 /* 2176 * This is an endpoint that called connect() how it got a 2177 * cookie that is NEW is a bit of a mystery. It must be that 2178 * the INIT was sent, but before it got there.. a complete 2179 * INIT/INIT-ACK/COOKIE arrived. But of course then it 2180 * should have went to the other code.. not here.. oh well.. 2181 * a bit of protection is worth having.. 2182 * 2183 * XXXMJ unlocked 2184 */ 2185 sctp_pcb_add_flags(stcb->sctp_ep, SCTP_PCB_FLAGS_CONNECTED); 2186 soisconnected(stcb->sctp_socket); 2187 } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 2188 (SCTP_IS_LISTENING(inp))) { 2189 /* 2190 * We don't want to do anything with this one. Since it is 2191 * the listening guy. The timer will get started for 2192 * accepted connections in the caller. 2193 */ 2194 ; 2195 } 2196 if (stcb->asoc.sctp_autoclose_ticks && 2197 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2198 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL); 2199 } 2200 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 2201 *netp = sctp_findnet(stcb, init_src); 2202 if (*netp != NULL) { 2203 /* 2204 * Since we did not send a HB, make sure we don't double 2205 * things. 2206 */ 2207 (*netp)->hb_responded = 1; 2208 } 2209 /* respond with a COOKIE-ACK */ 2210 sctp_send_cookie_ack(stcb); 2211 2212 /* 2213 * check the address lists for any ASCONFs that need to be sent 2214 * AFTER the cookie-ack is sent 2215 */ 2216 sctp_check_address_list(stcb, m, 2217 initack_offset + sizeof(struct sctp_init_ack_chunk), 2218 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)), 2219 &store.sa, cookie->local_scope, cookie->site_scope, 2220 cookie->ipv4_scope, cookie->loopback_scope); 2221 2222 return (stcb); 2223 } 2224 2225 /* 2226 * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e 2227 * we NEED to make sure we are not already using the vtag. If so we 2228 * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit! 2229 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag, 2230 SCTP_BASE_INFO(hashasocmark))]; 2231 LIST_FOREACH(stcb, head, sctp_asocs) { 2232 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep)) { 2233 -- SEND ABORT - TRY AGAIN -- 2234 } 2235 } 2236 */ 2237 2238 /* 2239 * handles a COOKIE-ECHO message stcb: modified to either a new or left as 2240 * existing (non-NULL) TCB 2241 */ 2242 static struct mbuf * 2243 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset, 2244 struct sockaddr *src, struct sockaddr *dst, 2245 struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp, 2246 struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp, 2247 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2248 struct sctp_tcb **locked_tcb, 2249 uint8_t mflowtype, uint32_t mflowid, 2250 uint32_t vrf_id, uint16_t port) 2251 { 2252 struct sctp_state_cookie *cookie; 2253 struct sctp_tcb *l_stcb = *stcb; 2254 struct sctp_inpcb *l_inp; 2255 struct sockaddr *to; 2256 struct sctp_pcb *ep; 2257 struct mbuf *m_sig; 2258 uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE]; 2259 uint8_t *sig; 2260 uint8_t cookie_ok = 0; 2261 unsigned int sig_offset, cookie_offset; 2262 unsigned int cookie_len; 2263 struct timeval now; 2264 struct timeval time_entered, time_expires; 2265 int notification = 0; 2266 struct sctp_nets *netl; 2267 int had_a_existing_tcb = 0; 2268 int send_int_conf = 0; 2269 #ifdef INET 2270 struct sockaddr_in sin; 2271 #endif 2272 #ifdef INET6 2273 struct sockaddr_in6 sin6; 2274 #endif 2275 2276 SCTPDBG(SCTP_DEBUG_INPUT2, 2277 "sctp_handle_cookie: handling COOKIE-ECHO\n"); 2278 2279 if (inp_p == NULL) { 2280 return (NULL); 2281 } 2282 cookie = &cp->cookie; 2283 cookie_offset = offset + sizeof(struct sctp_chunkhdr); 2284 cookie_len = ntohs(cp->ch.chunk_length); 2285 2286 if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) + 2287 sizeof(struct sctp_init_chunk) + 2288 sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) { 2289 /* cookie too small */ 2290 return (NULL); 2291 } 2292 if ((cookie->peerport != sh->src_port) || 2293 (cookie->myport != sh->dest_port) || 2294 (cookie->my_vtag != sh->v_tag)) { 2295 /* 2296 * invalid ports or bad tag. Note that we always leave the 2297 * v_tag in the header in network order and when we stored 2298 * it in the my_vtag slot we also left it in network order. 2299 * This maintains the match even though it may be in the 2300 * opposite byte order of the machine :-> 2301 */ 2302 return (NULL); 2303 } 2304 /* 2305 * split off the signature into its own mbuf (since it should not be 2306 * calculated in the sctp_hmac_m() call). 2307 */ 2308 sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE; 2309 m_sig = m_split(m, sig_offset, M_NOWAIT); 2310 if (m_sig == NULL) { 2311 /* out of memory or ?? */ 2312 return (NULL); 2313 } 2314 #ifdef SCTP_MBUF_LOGGING 2315 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 2316 sctp_log_mbc(m_sig, SCTP_MBUF_SPLIT); 2317 } 2318 #endif 2319 2320 /* 2321 * compute the signature/digest for the cookie 2322 */ 2323 if (l_stcb != NULL) { 2324 atomic_add_int(&l_stcb->asoc.refcnt, 1); 2325 SCTP_TCB_UNLOCK(l_stcb); 2326 } 2327 l_inp = *inp_p; 2328 SCTP_INP_RLOCK(l_inp); 2329 if (l_stcb != NULL) { 2330 SCTP_TCB_LOCK(l_stcb); 2331 atomic_subtract_int(&l_stcb->asoc.refcnt, 1); 2332 } 2333 if (l_inp->sctp_flags & (SCTP_PCB_FLAGS_SOCKET_GONE | SCTP_PCB_FLAGS_SOCKET_ALLGONE)) { 2334 SCTP_INP_RUNLOCK(l_inp); 2335 sctp_m_freem(m_sig); 2336 return (NULL); 2337 } 2338 ep = &(*inp_p)->sctp_ep; 2339 /* which cookie is it? */ 2340 if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) && 2341 (ep->current_secret_number != ep->last_secret_number)) { 2342 /* it's the old cookie */ 2343 (void)sctp_hmac_m(SCTP_HMAC, 2344 (uint8_t *)ep->secret_key[(int)ep->last_secret_number], 2345 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2346 } else { 2347 /* it's the current cookie */ 2348 (void)sctp_hmac_m(SCTP_HMAC, 2349 (uint8_t *)ep->secret_key[(int)ep->current_secret_number], 2350 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2351 } 2352 /* get the signature */ 2353 SCTP_INP_RUNLOCK(l_inp); 2354 sig = (uint8_t *)sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *)&tmp_sig); 2355 if (sig == NULL) { 2356 /* couldn't find signature */ 2357 sctp_m_freem(m_sig); 2358 return (NULL); 2359 } 2360 /* compare the received digest with the computed digest */ 2361 if (timingsafe_bcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) { 2362 /* try the old cookie? */ 2363 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) && 2364 (ep->current_secret_number != ep->last_secret_number)) { 2365 /* compute digest with old */ 2366 (void)sctp_hmac_m(SCTP_HMAC, 2367 (uint8_t *)ep->secret_key[(int)ep->last_secret_number], 2368 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2369 /* compare */ 2370 if (timingsafe_bcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0) 2371 cookie_ok = 1; 2372 } 2373 } else { 2374 cookie_ok = 1; 2375 } 2376 2377 /* 2378 * Now before we continue we must reconstruct our mbuf so that 2379 * normal processing of any other chunks will work. 2380 */ 2381 { 2382 struct mbuf *m_at; 2383 2384 m_at = m; 2385 while (SCTP_BUF_NEXT(m_at) != NULL) { 2386 m_at = SCTP_BUF_NEXT(m_at); 2387 } 2388 SCTP_BUF_NEXT(m_at) = m_sig; 2389 } 2390 2391 if (cookie_ok == 0) { 2392 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n"); 2393 SCTPDBG(SCTP_DEBUG_INPUT2, 2394 "offset = %u, cookie_offset = %u, sig_offset = %u\n", 2395 (uint32_t)offset, cookie_offset, sig_offset); 2396 return (NULL); 2397 } 2398 2399 if (sctp_ticks_to_msecs(cookie->cookie_life) > SCTP_MAX_COOKIE_LIFE) { 2400 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: Invalid cookie lifetime\n"); 2401 return (NULL); 2402 } 2403 time_entered.tv_sec = cookie->time_entered.tv_sec; 2404 time_entered.tv_usec = cookie->time_entered.tv_usec; 2405 if ((time_entered.tv_sec < 0) || 2406 (time_entered.tv_usec < 0) || 2407 (time_entered.tv_usec >= 1000000)) { 2408 /* Invalid time stamp. Cookie must have been modified. */ 2409 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: Invalid time stamp\n"); 2410 return (NULL); 2411 } 2412 (void)SCTP_GETTIME_TIMEVAL(&now); 2413 if (timevalcmp(&now, &time_entered, <)) { 2414 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie generated in the future!\n"); 2415 return (NULL); 2416 } 2417 /* 2418 * Check the cookie timestamps to be sure it's not stale. 2419 * cookie_life is in ticks, so we convert to seconds. 2420 */ 2421 time_expires.tv_sec = time_entered.tv_sec + sctp_ticks_to_secs(cookie->cookie_life); 2422 time_expires.tv_usec = time_entered.tv_usec; 2423 if (timevalcmp(&now, &time_expires, >)) { 2424 /* cookie is stale! */ 2425 struct mbuf *op_err; 2426 struct sctp_error_stale_cookie *cause; 2427 struct timeval diff; 2428 uint32_t staleness; 2429 2430 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_error_stale_cookie), 2431 0, M_NOWAIT, 1, MT_DATA); 2432 if (op_err == NULL) { 2433 /* FOOBAR */ 2434 return (NULL); 2435 } 2436 /* Set the len */ 2437 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_error_stale_cookie); 2438 cause = mtod(op_err, struct sctp_error_stale_cookie *); 2439 cause->cause.code = htons(SCTP_CAUSE_STALE_COOKIE); 2440 cause->cause.length = htons(sizeof(struct sctp_error_stale_cookie)); 2441 diff = now; 2442 timevalsub(&diff, &time_expires); 2443 if ((uint32_t)diff.tv_sec > UINT32_MAX / 1000000) { 2444 staleness = UINT32_MAX; 2445 } else { 2446 staleness = (uint32_t)diff.tv_sec * 1000000; 2447 } 2448 if (UINT32_MAX - staleness >= (uint32_t)diff.tv_usec) { 2449 staleness += (uint32_t)diff.tv_usec; 2450 } else { 2451 staleness = UINT32_MAX; 2452 } 2453 cause->stale_time = htonl(staleness); 2454 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 2455 mflowtype, mflowid, l_inp->fibnum, 2456 vrf_id, port); 2457 return (NULL); 2458 } 2459 /* 2460 * Now we must see with the lookup address if we have an existing 2461 * asoc. This will only happen if we were in the COOKIE-WAIT state 2462 * and a INIT collided with us and somewhere the peer sent the 2463 * cookie on another address besides the single address our assoc 2464 * had for him. In this case we will have one of the tie-tags set at 2465 * least AND the address field in the cookie can be used to look it 2466 * up. 2467 */ 2468 to = NULL; 2469 switch (cookie->addr_type) { 2470 #ifdef INET6 2471 case SCTP_IPV6_ADDRESS: 2472 memset(&sin6, 0, sizeof(sin6)); 2473 sin6.sin6_family = AF_INET6; 2474 sin6.sin6_len = sizeof(sin6); 2475 sin6.sin6_port = sh->src_port; 2476 sin6.sin6_scope_id = cookie->scope_id; 2477 memcpy(&sin6.sin6_addr.s6_addr, cookie->address, 2478 sizeof(sin6.sin6_addr.s6_addr)); 2479 to = (struct sockaddr *)&sin6; 2480 break; 2481 #endif 2482 #ifdef INET 2483 case SCTP_IPV4_ADDRESS: 2484 memset(&sin, 0, sizeof(sin)); 2485 sin.sin_family = AF_INET; 2486 sin.sin_len = sizeof(sin); 2487 sin.sin_port = sh->src_port; 2488 sin.sin_addr.s_addr = cookie->address[0]; 2489 to = (struct sockaddr *)&sin; 2490 break; 2491 #endif 2492 default: 2493 /* This should not happen */ 2494 return (NULL); 2495 } 2496 if (*stcb == NULL) { 2497 /* Yep, lets check */ 2498 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL); 2499 if (*stcb == NULL) { 2500 /* 2501 * We should have only got back the same inp. If we 2502 * got back a different ep we have a problem. The 2503 * original findep got back l_inp and now 2504 */ 2505 if (l_inp != *inp_p) { 2506 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n"); 2507 } 2508 } else { 2509 if (*locked_tcb == NULL) { 2510 /* 2511 * In this case we found the assoc only 2512 * after we locked the create lock. This 2513 * means we are in a colliding case and we 2514 * must make sure that we unlock the tcb if 2515 * its one of the cases where we throw away 2516 * the incoming packets. 2517 */ 2518 *locked_tcb = *stcb; 2519 2520 /* 2521 * We must also increment the inp ref count 2522 * since the ref_count flags was set when we 2523 * did not find the TCB, now we found it 2524 * which reduces the refcount.. we must 2525 * raise it back out to balance it all :-) 2526 */ 2527 SCTP_INP_INCR_REF((*stcb)->sctp_ep); 2528 if ((*stcb)->sctp_ep != l_inp) { 2529 SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n", 2530 (void *)(*stcb)->sctp_ep, (void *)l_inp); 2531 } 2532 } 2533 } 2534 } 2535 2536 cookie_len -= SCTP_SIGNATURE_SIZE; 2537 if (*stcb == NULL) { 2538 /* this is the "normal" case... get a new TCB */ 2539 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh, 2540 cookie, cookie_len, *inp_p, 2541 netp, to, ¬ification, 2542 auth_skipped, auth_offset, auth_len, 2543 mflowtype, mflowid, 2544 vrf_id, port); 2545 } else { 2546 /* this is abnormal... cookie-echo on existing TCB */ 2547 had_a_existing_tcb = 1; 2548 *stcb = sctp_process_cookie_existing(m, iphlen, offset, 2549 src, dst, sh, 2550 cookie, cookie_len, *inp_p, *stcb, netp, to, 2551 ¬ification, auth_skipped, auth_offset, auth_len, 2552 mflowtype, mflowid, 2553 vrf_id, port); 2554 if (*stcb == NULL) { 2555 *locked_tcb = NULL; 2556 } 2557 } 2558 2559 if (*stcb == NULL) { 2560 /* still no TCB... must be bad cookie-echo */ 2561 return (NULL); 2562 } 2563 if (*netp != NULL) { 2564 (*netp)->flowtype = mflowtype; 2565 (*netp)->flowid = mflowid; 2566 } 2567 /* 2568 * Ok, we built an association so confirm the address we sent the 2569 * INIT-ACK to. 2570 */ 2571 netl = sctp_findnet(*stcb, to); 2572 /* 2573 * This code should in theory NOT run but 2574 */ 2575 if (netl == NULL) { 2576 /* TSNH! Huh, why do I need to add this address here? */ 2577 if (sctp_add_remote_addr(*stcb, to, NULL, port, 2578 SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) { 2579 return (NULL); 2580 } 2581 netl = sctp_findnet(*stcb, to); 2582 } 2583 if (netl) { 2584 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) { 2585 netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 2586 (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL, 2587 netl); 2588 send_int_conf = 1; 2589 } 2590 } 2591 sctp_start_net_timers(*stcb); 2592 if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) { 2593 if (!had_a_existing_tcb || 2594 (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) { 2595 /* 2596 * If we have a NEW cookie or the connect never 2597 * reached the connected state during collision we 2598 * must do the TCP accept thing. 2599 */ 2600 struct socket *so, *oso; 2601 struct sctp_inpcb *inp; 2602 2603 if (notification == SCTP_NOTIFY_ASSOC_RESTART) { 2604 /* 2605 * For a restart we will keep the same 2606 * socket, no need to do anything. I THINK!! 2607 */ 2608 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2609 if (send_int_conf) { 2610 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2611 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2612 } 2613 return (m); 2614 } 2615 oso = (*inp_p)->sctp_socket; 2616 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2617 SCTP_TCB_UNLOCK((*stcb)); 2618 CURVNET_SET(oso->so_vnet); 2619 so = sonewconn(oso, 0 2620 ); 2621 CURVNET_RESTORE(); 2622 SCTP_TCB_LOCK((*stcb)); 2623 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2624 2625 if (so == NULL) { 2626 struct mbuf *op_err; 2627 2628 /* Too many sockets */ 2629 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n"); 2630 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2631 sctp_abort_association(*inp_p, NULL, m, iphlen, 2632 src, dst, sh, op_err, 2633 mflowtype, mflowid, 2634 vrf_id, port); 2635 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, 2636 SCTP_FROM_SCTP_INPUT + SCTP_LOC_23); 2637 return (NULL); 2638 } 2639 inp = (struct sctp_inpcb *)so->so_pcb; 2640 SCTP_INP_INCR_REF(inp); 2641 /* 2642 * We add the unbound flag here so that if we get an 2643 * soabort() before we get the move_pcb done, we 2644 * will properly cleanup. 2645 */ 2646 inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE | 2647 SCTP_PCB_FLAGS_CONNECTED | 2648 SCTP_PCB_FLAGS_IN_TCPPOOL | 2649 SCTP_PCB_FLAGS_UNBOUND | 2650 (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) | 2651 SCTP_PCB_FLAGS_DONT_WAKE); 2652 inp->sctp_features = (*inp_p)->sctp_features; 2653 inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features; 2654 inp->sctp_socket = so; 2655 inp->sctp_frag_point = (*inp_p)->sctp_frag_point; 2656 inp->max_cwnd = (*inp_p)->max_cwnd; 2657 inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off; 2658 inp->ecn_supported = (*inp_p)->ecn_supported; 2659 inp->prsctp_supported = (*inp_p)->prsctp_supported; 2660 inp->auth_supported = (*inp_p)->auth_supported; 2661 inp->asconf_supported = (*inp_p)->asconf_supported; 2662 inp->reconfig_supported = (*inp_p)->reconfig_supported; 2663 inp->nrsack_supported = (*inp_p)->nrsack_supported; 2664 inp->pktdrop_supported = (*inp_p)->pktdrop_supported; 2665 inp->partial_delivery_point = (*inp_p)->partial_delivery_point; 2666 inp->sctp_context = (*inp_p)->sctp_context; 2667 inp->local_strreset_support = (*inp_p)->local_strreset_support; 2668 inp->fibnum = (*inp_p)->fibnum; 2669 /* 2670 * copy in the authentication parameters from the 2671 * original endpoint 2672 */ 2673 if (inp->sctp_ep.local_hmacs) 2674 sctp_free_hmaclist(inp->sctp_ep.local_hmacs); 2675 inp->sctp_ep.local_hmacs = 2676 sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs); 2677 if (inp->sctp_ep.local_auth_chunks) 2678 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks); 2679 inp->sctp_ep.local_auth_chunks = 2680 sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks); 2681 2682 /* 2683 * Now we must move it from one hash table to 2684 * another and get the tcb in the right place. 2685 */ 2686 2687 /* 2688 * This is where the one-2-one socket is put into 2689 * the accept state waiting for the accept! 2690 */ 2691 if (*stcb) { 2692 SCTP_ADD_SUBSTATE(*stcb, SCTP_STATE_IN_ACCEPT_QUEUE); 2693 } 2694 sctp_move_pcb_and_assoc(*inp_p, inp, *stcb); 2695 2696 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2697 SCTP_TCB_UNLOCK((*stcb)); 2698 2699 sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb, 2700 0); 2701 SCTP_TCB_LOCK((*stcb)); 2702 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2703 2704 /* 2705 * now we must check to see if we were aborted while 2706 * the move was going on and the lock/unlock 2707 * happened. 2708 */ 2709 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 2710 /* 2711 * yep it was, we leave the assoc attached 2712 * to the socket since the sctp_inpcb_free() 2713 * call will send an abort for us. 2714 */ 2715 SCTP_INP_DECR_REF(inp); 2716 return (NULL); 2717 } 2718 SCTP_INP_DECR_REF(inp); 2719 /* Switch over to the new guy */ 2720 *inp_p = inp; 2721 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2722 if (send_int_conf) { 2723 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2724 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2725 } 2726 2727 /* 2728 * Pull it from the incomplete queue and wake the 2729 * guy 2730 */ 2731 soisconnected(so); 2732 return (m); 2733 } 2734 } 2735 if (notification) { 2736 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2737 } 2738 if (send_int_conf) { 2739 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2740 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2741 } 2742 return (m); 2743 } 2744 2745 static void 2746 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED, 2747 struct sctp_tcb *stcb, struct sctp_nets *net) 2748 { 2749 /* cp must not be used, others call this without a c-ack :-) */ 2750 struct sctp_association *asoc; 2751 struct sctp_tmit_chunk *chk; 2752 2753 SCTPDBG(SCTP_DEBUG_INPUT2, 2754 "sctp_handle_cookie_ack: handling COOKIE-ACK\n"); 2755 if ((stcb == NULL) || (net == NULL)) { 2756 return; 2757 } 2758 2759 asoc = &stcb->asoc; 2760 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 2761 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 2762 asoc->overall_error_count, 2763 0, 2764 SCTP_FROM_SCTP_INPUT, 2765 __LINE__); 2766 } 2767 sctp_stop_all_cookie_timers(stcb); 2768 sctp_toss_old_cookies(stcb, asoc); 2769 /* process according to association state */ 2770 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) { 2771 /* state change only needed when I am in right state */ 2772 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2773 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 2774 sctp_start_net_timers(stcb); 2775 /* update RTO */ 2776 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 2777 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2778 if (asoc->overall_error_count == 0) { 2779 sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, 2780 SCTP_RTT_FROM_NON_DATA); 2781 } 2782 /* 2783 * Since we did not send a HB make sure we don't double 2784 * things. 2785 */ 2786 asoc->overall_error_count = 0; 2787 net->hb_responded = 1; 2788 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 2789 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2790 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2791 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 2792 sctp_pcb_add_flags(stcb->sctp_ep, SCTP_PCB_FLAGS_CONNECTED); 2793 if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) { 2794 soisconnected(stcb->sctp_socket); 2795 } 2796 } 2797 2798 if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) && 2799 TAILQ_EMPTY(&asoc->send_queue) && 2800 TAILQ_EMPTY(&asoc->sent_queue) && 2801 (asoc->stream_queue_cnt == 0)) { 2802 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 2803 SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_SENT); 2804 sctp_stop_timers_for_shutdown(stcb); 2805 sctp_send_shutdown(stcb, net); 2806 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, 2807 stcb->sctp_ep, stcb, net); 2808 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2809 stcb->sctp_ep, stcb, NULL); 2810 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_T3, SCTP_SO_LOCKED); 2811 } 2812 2813 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2814 /* 2815 * We don't need to do the asconf thing, nor hb or 2816 * autoclose if the socket is closed. 2817 */ 2818 goto closed_socket; 2819 } 2820 2821 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 2822 stcb, net); 2823 2824 if (stcb->asoc.sctp_autoclose_ticks && 2825 sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2826 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 2827 stcb->sctp_ep, stcb, NULL); 2828 } 2829 /* 2830 * send ASCONF if parameters are pending and ASCONFs are 2831 * allowed (eg. addresses changed when init/cookie echo were 2832 * in flight) 2833 */ 2834 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) && 2835 (stcb->asoc.asconf_supported == 1) && 2836 (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) { 2837 #ifdef SCTP_TIMER_BASED_ASCONF 2838 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, 2839 stcb->sctp_ep, stcb, 2840 stcb->asoc.primary_destination); 2841 #else 2842 sctp_send_asconf(stcb, stcb->asoc.primary_destination, 2843 SCTP_ADDR_NOT_LOCKED); 2844 #endif 2845 } 2846 } 2847 closed_socket: 2848 /* Restart the timer if we have pending data */ 2849 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) { 2850 if (chk->whoTo != NULL) { 2851 break; 2852 } 2853 } 2854 if (chk != NULL) { 2855 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 2856 } 2857 } 2858 2859 static void 2860 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp, 2861 struct sctp_tcb *stcb) 2862 { 2863 struct sctp_nets *net; 2864 struct sctp_tmit_chunk *lchk; 2865 struct sctp_ecne_chunk bkup; 2866 uint8_t override_bit; 2867 uint32_t tsn, window_data_tsn; 2868 int len; 2869 unsigned int pkt_cnt; 2870 2871 len = ntohs(cp->ch.chunk_length); 2872 if (len == sizeof(struct old_sctp_ecne_chunk)) { 2873 /* Its the old format */ 2874 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk)); 2875 bkup.num_pkts_since_cwr = htonl(1); 2876 cp = &bkup; 2877 } 2878 SCTP_STAT_INCR(sctps_recvecne); 2879 tsn = ntohl(cp->tsn); 2880 pkt_cnt = ntohl(cp->num_pkts_since_cwr); 2881 lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead); 2882 if (lchk == NULL) { 2883 window_data_tsn = stcb->asoc.sending_seq - 1; 2884 } else { 2885 window_data_tsn = lchk->rec.data.tsn; 2886 } 2887 2888 /* Find where it was sent to if possible. */ 2889 net = NULL; 2890 TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) { 2891 if (lchk->rec.data.tsn == tsn) { 2892 net = lchk->whoTo; 2893 net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send; 2894 break; 2895 } 2896 if (SCTP_TSN_GT(lchk->rec.data.tsn, tsn)) { 2897 break; 2898 } 2899 } 2900 if (net == NULL) { 2901 /* 2902 * What to do. A previous send of a CWR was possibly lost. 2903 * See how old it is, we may have it marked on the actual 2904 * net. 2905 */ 2906 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 2907 if (tsn == net->last_cwr_tsn) { 2908 /* Found him, send it off */ 2909 break; 2910 } 2911 } 2912 if (net == NULL) { 2913 /* 2914 * If we reach here, we need to send a special CWR 2915 * that says hey, we did this a long time ago and 2916 * you lost the response. 2917 */ 2918 net = TAILQ_FIRST(&stcb->asoc.nets); 2919 if (net == NULL) { 2920 /* TSNH */ 2921 return; 2922 } 2923 override_bit = SCTP_CWR_REDUCE_OVERRIDE; 2924 } else { 2925 override_bit = 0; 2926 } 2927 } else { 2928 override_bit = 0; 2929 } 2930 if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) && 2931 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 2932 /* 2933 * JRS - Use the congestion control given in the pluggable 2934 * CC module 2935 */ 2936 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt); 2937 /* 2938 * We reduce once every RTT. So we will only lower cwnd at 2939 * the next sending seq i.e. the window_data_tsn 2940 */ 2941 net->cwr_window_tsn = window_data_tsn; 2942 net->ecn_ce_pkt_cnt += pkt_cnt; 2943 net->lost_cnt = pkt_cnt; 2944 net->last_cwr_tsn = tsn; 2945 } else { 2946 override_bit |= SCTP_CWR_IN_SAME_WINDOW; 2947 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) && 2948 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 2949 /* 2950 * Another loss in the same window update how many 2951 * marks/packets lost we have had. 2952 */ 2953 int cnt = 1; 2954 2955 if (pkt_cnt > net->lost_cnt) { 2956 /* Should be the case */ 2957 cnt = (pkt_cnt - net->lost_cnt); 2958 net->ecn_ce_pkt_cnt += cnt; 2959 } 2960 net->lost_cnt = pkt_cnt; 2961 net->last_cwr_tsn = tsn; 2962 /* 2963 * Most CC functions will ignore this call, since we 2964 * are in-window yet of the initial CE the peer saw. 2965 */ 2966 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt); 2967 } 2968 } 2969 /* 2970 * We always send a CWR this way if our previous one was lost our 2971 * peer will get an update, or if it is not time again to reduce we 2972 * still get the cwr to the peer. Note we set the override when we 2973 * could not find the TSN on the chunk or the destination network. 2974 */ 2975 sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit); 2976 } 2977 2978 static void 2979 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net) 2980 { 2981 /* 2982 * Here we get a CWR from the peer. We must look in the outqueue and 2983 * make sure that we have a covered ECNE in the control chunk part. 2984 * If so remove it. 2985 */ 2986 struct sctp_tmit_chunk *chk, *nchk; 2987 struct sctp_ecne_chunk *ecne; 2988 int override; 2989 uint32_t cwr_tsn; 2990 2991 cwr_tsn = ntohl(cp->tsn); 2992 override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE; 2993 TAILQ_FOREACH_SAFE(chk, &stcb->asoc.control_send_queue, sctp_next, nchk) { 2994 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) { 2995 continue; 2996 } 2997 if ((override == 0) && (chk->whoTo != net)) { 2998 /* Must be from the right src unless override is set */ 2999 continue; 3000 } 3001 ecne = mtod(chk->data, struct sctp_ecne_chunk *); 3002 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) { 3003 /* this covers this ECNE, we can remove it */ 3004 stcb->asoc.ecn_echo_cnt_onq--; 3005 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, 3006 sctp_next); 3007 stcb->asoc.ctrl_queue_cnt--; 3008 sctp_m_freem(chk->data); 3009 chk->data = NULL; 3010 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3011 if (override == 0) { 3012 break; 3013 } 3014 } 3015 } 3016 } 3017 3018 static void 3019 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED, 3020 struct sctp_tcb *stcb, struct sctp_nets *net) 3021 { 3022 3023 SCTPDBG(SCTP_DEBUG_INPUT2, 3024 "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n"); 3025 if (stcb == NULL) 3026 return; 3027 3028 /* process according to association state */ 3029 if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 3030 /* unexpected SHUTDOWN-COMPLETE... so ignore... */ 3031 SCTPDBG(SCTP_DEBUG_INPUT2, 3032 "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n"); 3033 SCTP_TCB_UNLOCK(stcb); 3034 return; 3035 } 3036 /* notify upper layer protocol */ 3037 if (stcb->sctp_socket) { 3038 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 3039 } 3040 #ifdef INVARIANTS 3041 if (!TAILQ_EMPTY(&stcb->asoc.send_queue) || 3042 !TAILQ_EMPTY(&stcb->asoc.sent_queue) || 3043 sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) { 3044 panic("Queues are not empty when handling SHUTDOWN-COMPLETE"); 3045 } 3046 #endif 3047 /* stop the timer */ 3048 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, 3049 SCTP_FROM_SCTP_INPUT + SCTP_LOC_24); 3050 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 3051 /* free the TCB */ 3052 SCTPDBG(SCTP_DEBUG_INPUT2, 3053 "sctp_handle_shutdown_complete: calls free-asoc\n"); 3054 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 3055 SCTP_FROM_SCTP_INPUT + SCTP_LOC_25); 3056 return; 3057 } 3058 3059 static int 3060 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc, 3061 struct sctp_nets *net, uint8_t flg) 3062 { 3063 switch (desc->chunk_type) { 3064 case SCTP_DATA: 3065 case SCTP_IDATA: 3066 /* find the tsn to resend (possibly) */ 3067 { 3068 uint32_t tsn; 3069 struct sctp_tmit_chunk *tp1; 3070 3071 tsn = ntohl(desc->tsn_ifany); 3072 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3073 if (tp1->rec.data.tsn == tsn) { 3074 /* found it */ 3075 break; 3076 } 3077 if (SCTP_TSN_GT(tp1->rec.data.tsn, tsn)) { 3078 /* not found */ 3079 tp1 = NULL; 3080 break; 3081 } 3082 } 3083 if (tp1 == NULL) { 3084 /* 3085 * Do it the other way , aka without paying 3086 * attention to queue seq order. 3087 */ 3088 SCTP_STAT_INCR(sctps_pdrpdnfnd); 3089 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3090 if (tp1->rec.data.tsn == tsn) { 3091 /* found it */ 3092 break; 3093 } 3094 } 3095 } 3096 if (tp1 == NULL) { 3097 SCTP_STAT_INCR(sctps_pdrptsnnf); 3098 } 3099 if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) { 3100 if (((flg & SCTP_BADCRC) == 0) && 3101 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3102 return (0); 3103 } 3104 if ((stcb->asoc.peers_rwnd == 0) && 3105 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3106 SCTP_STAT_INCR(sctps_pdrpdiwnp); 3107 return (0); 3108 } 3109 if (stcb->asoc.peers_rwnd == 0 && 3110 (flg & SCTP_FROM_MIDDLE_BOX)) { 3111 SCTP_STAT_INCR(sctps_pdrpdizrw); 3112 return (0); 3113 } 3114 if ((uint32_t)SCTP_BUF_LEN(tp1->data) < 3115 SCTP_DATA_CHUNK_OVERHEAD(stcb) + SCTP_NUM_DB_TO_VERIFY) { 3116 /* Payload not matching. */ 3117 SCTP_STAT_INCR(sctps_pdrpbadd); 3118 return (-1); 3119 } 3120 if (memcmp(mtod(tp1->data, caddr_t)+SCTP_DATA_CHUNK_OVERHEAD(stcb), 3121 desc->data_bytes, SCTP_NUM_DB_TO_VERIFY) != 0) { 3122 /* Payload not matching. */ 3123 SCTP_STAT_INCR(sctps_pdrpbadd); 3124 return (-1); 3125 } 3126 if (tp1->do_rtt) { 3127 /* 3128 * this guy had a RTO calculation 3129 * pending on it, cancel it 3130 */ 3131 if (tp1->whoTo->rto_needed == 0) { 3132 tp1->whoTo->rto_needed = 1; 3133 } 3134 tp1->do_rtt = 0; 3135 } 3136 SCTP_STAT_INCR(sctps_pdrpmark); 3137 if (tp1->sent != SCTP_DATAGRAM_RESEND) 3138 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3139 /* 3140 * mark it as if we were doing a FR, since 3141 * we will be getting gap ack reports behind 3142 * the info from the router. 3143 */ 3144 tp1->rec.data.doing_fast_retransmit = 1; 3145 /* 3146 * mark the tsn with what sequences can 3147 * cause a new FR. 3148 */ 3149 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) { 3150 tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq; 3151 } else { 3152 tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.tsn; 3153 } 3154 3155 /* restart the timer */ 3156 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3157 stcb, tp1->whoTo, 3158 SCTP_FROM_SCTP_INPUT + SCTP_LOC_26); 3159 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3160 stcb, tp1->whoTo); 3161 3162 /* fix counts and things */ 3163 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 3164 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP, 3165 tp1->whoTo->flight_size, 3166 tp1->book_size, 3167 (uint32_t)(uintptr_t)stcb, 3168 tp1->rec.data.tsn); 3169 } 3170 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3171 sctp_flight_size_decrease(tp1); 3172 sctp_total_flight_decrease(stcb, tp1); 3173 } 3174 tp1->sent = SCTP_DATAGRAM_RESEND; 3175 } { 3176 /* audit code */ 3177 unsigned int audit; 3178 3179 audit = 0; 3180 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3181 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3182 audit++; 3183 } 3184 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue, 3185 sctp_next) { 3186 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3187 audit++; 3188 } 3189 if (audit != stcb->asoc.sent_queue_retran_cnt) { 3190 SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n", 3191 audit, stcb->asoc.sent_queue_retran_cnt); 3192 #ifndef SCTP_AUDITING_ENABLED 3193 stcb->asoc.sent_queue_retran_cnt = audit; 3194 #endif 3195 } 3196 } 3197 } 3198 break; 3199 case SCTP_ASCONF: 3200 { 3201 struct sctp_tmit_chunk *asconf; 3202 3203 TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue, 3204 sctp_next) { 3205 if (asconf->rec.chunk_id.id == SCTP_ASCONF) { 3206 break; 3207 } 3208 } 3209 if (asconf) { 3210 if (asconf->sent != SCTP_DATAGRAM_RESEND) 3211 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3212 asconf->sent = SCTP_DATAGRAM_RESEND; 3213 asconf->snd_count--; 3214 } 3215 } 3216 break; 3217 case SCTP_INITIATION: 3218 /* resend the INIT */ 3219 stcb->asoc.dropped_special_cnt++; 3220 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) { 3221 /* 3222 * If we can get it in, in a few attempts we do 3223 * this, otherwise we let the timer fire. 3224 */ 3225 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, 3226 stcb, net, 3227 SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 3228 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 3229 } 3230 break; 3231 case SCTP_SELECTIVE_ACK: 3232 case SCTP_NR_SELECTIVE_ACK: 3233 /* resend the sack */ 3234 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED); 3235 break; 3236 case SCTP_HEARTBEAT_REQUEST: 3237 /* resend a demand HB */ 3238 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) { 3239 /* 3240 * Only retransmit if we KNOW we wont destroy the 3241 * tcb 3242 */ 3243 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 3244 } 3245 break; 3246 case SCTP_SHUTDOWN: 3247 sctp_send_shutdown(stcb, net); 3248 break; 3249 case SCTP_SHUTDOWN_ACK: 3250 sctp_send_shutdown_ack(stcb, net); 3251 break; 3252 case SCTP_COOKIE_ECHO: 3253 { 3254 struct sctp_tmit_chunk *cookie; 3255 3256 cookie = NULL; 3257 TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, 3258 sctp_next) { 3259 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) { 3260 break; 3261 } 3262 } 3263 if (cookie) { 3264 if (cookie->sent != SCTP_DATAGRAM_RESEND) 3265 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3266 cookie->sent = SCTP_DATAGRAM_RESEND; 3267 sctp_stop_all_cookie_timers(stcb); 3268 } 3269 } 3270 break; 3271 case SCTP_COOKIE_ACK: 3272 sctp_send_cookie_ack(stcb); 3273 break; 3274 case SCTP_ASCONF_ACK: 3275 /* resend last asconf ack */ 3276 sctp_send_asconf_ack(stcb); 3277 break; 3278 case SCTP_IFORWARD_CUM_TSN: 3279 case SCTP_FORWARD_CUM_TSN: 3280 send_forward_tsn(stcb, &stcb->asoc); 3281 break; 3282 /* can't do anything with these */ 3283 case SCTP_PACKET_DROPPED: 3284 case SCTP_INITIATION_ACK: /* this should not happen */ 3285 case SCTP_HEARTBEAT_ACK: 3286 case SCTP_ABORT_ASSOCIATION: 3287 case SCTP_OPERATION_ERROR: 3288 case SCTP_SHUTDOWN_COMPLETE: 3289 case SCTP_ECN_ECHO: 3290 case SCTP_ECN_CWR: 3291 default: 3292 break; 3293 } 3294 return (0); 3295 } 3296 3297 void 3298 sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list) 3299 { 3300 uint32_t i; 3301 uint16_t temp; 3302 3303 /* 3304 * We set things to 0xffffffff since this is the last delivered 3305 * sequence and we will be sending in 0 after the reset. 3306 */ 3307 3308 if (number_entries) { 3309 for (i = 0; i < number_entries; i++) { 3310 temp = ntohs(list[i]); 3311 if (temp >= stcb->asoc.streamincnt) { 3312 continue; 3313 } 3314 stcb->asoc.strmin[temp].last_mid_delivered = 0xffffffff; 3315 } 3316 } else { 3317 list = NULL; 3318 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3319 stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff; 3320 } 3321 } 3322 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3323 } 3324 3325 static void 3326 sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list) 3327 { 3328 uint32_t i; 3329 uint16_t temp; 3330 3331 if (number_entries > 0) { 3332 for (i = 0; i < number_entries; i++) { 3333 temp = ntohs(list[i]); 3334 if (temp >= stcb->asoc.streamoutcnt) { 3335 /* no such stream */ 3336 continue; 3337 } 3338 stcb->asoc.strmout[temp].next_mid_ordered = 0; 3339 stcb->asoc.strmout[temp].next_mid_unordered = 0; 3340 } 3341 } else { 3342 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3343 stcb->asoc.strmout[i].next_mid_ordered = 0; 3344 stcb->asoc.strmout[i].next_mid_unordered = 0; 3345 } 3346 } 3347 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3348 } 3349 3350 static void 3351 sctp_reset_clear_pending(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list) 3352 { 3353 uint32_t i; 3354 uint16_t temp; 3355 3356 if (number_entries > 0) { 3357 for (i = 0; i < number_entries; i++) { 3358 temp = ntohs(list[i]); 3359 if (temp >= stcb->asoc.streamoutcnt) { 3360 /* no such stream */ 3361 continue; 3362 } 3363 stcb->asoc.strmout[temp].state = SCTP_STREAM_OPEN; 3364 } 3365 } else { 3366 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3367 stcb->asoc.strmout[i].state = SCTP_STREAM_OPEN; 3368 } 3369 } 3370 } 3371 3372 struct sctp_stream_reset_request * 3373 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk) 3374 { 3375 struct sctp_association *asoc; 3376 struct sctp_chunkhdr *ch; 3377 struct sctp_stream_reset_request *r; 3378 struct sctp_tmit_chunk *chk; 3379 int len, clen; 3380 3381 asoc = &stcb->asoc; 3382 chk = asoc->str_reset; 3383 if (TAILQ_EMPTY(&asoc->control_send_queue) || 3384 (chk == NULL)) { 3385 asoc->stream_reset_outstanding = 0; 3386 return (NULL); 3387 } 3388 if (chk->data == NULL) { 3389 return (NULL); 3390 } 3391 if (bchk != NULL) { 3392 /* he wants a copy of the chk pointer */ 3393 *bchk = chk; 3394 } 3395 clen = chk->send_size; 3396 ch = mtod(chk->data, struct sctp_chunkhdr *); 3397 r = (struct sctp_stream_reset_request *)(ch + 1); 3398 if (ntohl(r->request_seq) == seq) { 3399 /* found it */ 3400 return (r); 3401 } 3402 len = SCTP_SIZE32(ntohs(r->ph.param_length)); 3403 if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) { 3404 /* move to the next one, there can only be a max of two */ 3405 r = (struct sctp_stream_reset_request *)((caddr_t)r + len); 3406 if (ntohl(r->request_seq) == seq) { 3407 return (r); 3408 } 3409 } 3410 /* that seq is not here */ 3411 return (NULL); 3412 } 3413 3414 static void 3415 sctp_clean_up_stream_reset(struct sctp_tcb *stcb) 3416 { 3417 struct sctp_association *asoc; 3418 struct sctp_tmit_chunk *chk; 3419 3420 asoc = &stcb->asoc; 3421 chk = asoc->str_reset; 3422 if (chk == NULL) { 3423 return; 3424 } 3425 asoc->str_reset = NULL; 3426 sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, 3427 NULL, SCTP_FROM_SCTP_INPUT + SCTP_LOC_28); 3428 TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next); 3429 asoc->ctrl_queue_cnt--; 3430 if (chk->data) { 3431 sctp_m_freem(chk->data); 3432 chk->data = NULL; 3433 } 3434 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3435 } 3436 3437 static int 3438 sctp_handle_stream_reset_response(struct sctp_tcb *stcb, 3439 uint32_t seq, uint32_t action, 3440 struct sctp_stream_reset_response *respin) 3441 { 3442 uint16_t type; 3443 int lparam_len; 3444 struct sctp_association *asoc = &stcb->asoc; 3445 struct sctp_tmit_chunk *chk; 3446 struct sctp_stream_reset_request *req_param; 3447 struct sctp_stream_reset_out_request *req_out_param; 3448 struct sctp_stream_reset_in_request *req_in_param; 3449 uint32_t number_entries; 3450 3451 if (asoc->stream_reset_outstanding == 0) { 3452 /* duplicate */ 3453 return (0); 3454 } 3455 if (seq == stcb->asoc.str_reset_seq_out) { 3456 req_param = sctp_find_stream_reset(stcb, seq, &chk); 3457 if (req_param != NULL) { 3458 stcb->asoc.str_reset_seq_out++; 3459 type = ntohs(req_param->ph.param_type); 3460 lparam_len = ntohs(req_param->ph.param_length); 3461 if (type == SCTP_STR_RESET_OUT_REQUEST) { 3462 int no_clear = 0; 3463 3464 req_out_param = (struct sctp_stream_reset_out_request *)req_param; 3465 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t); 3466 asoc->stream_reset_out_is_outstanding = 0; 3467 if (asoc->stream_reset_outstanding) 3468 asoc->stream_reset_outstanding--; 3469 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3470 /* do it */ 3471 sctp_reset_out_streams(stcb, number_entries, req_out_param->list_of_streams); 3472 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3473 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3474 } else if (action == SCTP_STREAM_RESET_RESULT_IN_PROGRESS) { 3475 /* 3476 * Set it up so we don't stop 3477 * retransmitting 3478 */ 3479 asoc->stream_reset_outstanding++; 3480 stcb->asoc.str_reset_seq_out--; 3481 asoc->stream_reset_out_is_outstanding = 1; 3482 no_clear = 1; 3483 } else { 3484 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3485 } 3486 if (no_clear == 0) { 3487 sctp_reset_clear_pending(stcb, number_entries, req_out_param->list_of_streams); 3488 } 3489 } else if (type == SCTP_STR_RESET_IN_REQUEST) { 3490 req_in_param = (struct sctp_stream_reset_in_request *)req_param; 3491 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t); 3492 if (asoc->stream_reset_outstanding) 3493 asoc->stream_reset_outstanding--; 3494 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3495 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb, 3496 number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3497 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3498 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb, 3499 number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3500 } 3501 } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) { 3502 /* Ok we now may have more streams */ 3503 int num_stream; 3504 3505 num_stream = stcb->asoc.strm_pending_add_size; 3506 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) { 3507 /* TSNH */ 3508 num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt; 3509 } 3510 stcb->asoc.strm_pending_add_size = 0; 3511 if (asoc->stream_reset_outstanding) 3512 asoc->stream_reset_outstanding--; 3513 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3514 /* Put the new streams into effect */ 3515 int i; 3516 3517 for (i = asoc->streamoutcnt; i < (asoc->streamoutcnt + num_stream); i++) { 3518 asoc->strmout[i].state = SCTP_STREAM_OPEN; 3519 } 3520 asoc->streamoutcnt += num_stream; 3521 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 3522 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3523 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3524 SCTP_STREAM_CHANGE_DENIED); 3525 } else { 3526 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3527 SCTP_STREAM_CHANGE_FAILED); 3528 } 3529 } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) { 3530 if (asoc->stream_reset_outstanding) 3531 asoc->stream_reset_outstanding--; 3532 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3533 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3534 SCTP_STREAM_CHANGE_DENIED); 3535 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3536 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3537 SCTP_STREAM_CHANGE_FAILED); 3538 } 3539 } else if (type == SCTP_STR_RESET_TSN_REQUEST) { 3540 /** 3541 * a) Adopt the new in tsn. 3542 * b) reset the map 3543 * c) Adopt the new out-tsn 3544 */ 3545 struct sctp_stream_reset_response_tsn *resp; 3546 struct sctp_forward_tsn_chunk fwdtsn; 3547 int abort_flag = 0; 3548 3549 if (respin == NULL) { 3550 /* huh ? */ 3551 return (0); 3552 } 3553 if (ntohs(respin->ph.param_length) < sizeof(struct sctp_stream_reset_response_tsn)) { 3554 return (0); 3555 } 3556 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3557 resp = (struct sctp_stream_reset_response_tsn *)respin; 3558 asoc->stream_reset_outstanding--; 3559 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3560 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3561 fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1); 3562 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3563 if (abort_flag) { 3564 return (1); 3565 } 3566 stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1); 3567 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3568 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3569 } 3570 3571 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 3572 stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn); 3573 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 3574 3575 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map; 3576 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size); 3577 3578 stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn); 3579 stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn; 3580 3581 sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL); 3582 sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL); 3583 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0); 3584 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3585 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3586 SCTP_ASSOC_RESET_DENIED); 3587 } else { 3588 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3589 SCTP_ASSOC_RESET_FAILED); 3590 } 3591 } 3592 /* get rid of the request and get the request flags */ 3593 if (asoc->stream_reset_outstanding == 0) { 3594 sctp_clean_up_stream_reset(stcb); 3595 } 3596 } 3597 } 3598 if (asoc->stream_reset_outstanding == 0) { 3599 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED); 3600 } 3601 return (0); 3602 } 3603 3604 static void 3605 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb, 3606 struct sctp_tmit_chunk *chk, 3607 struct sctp_stream_reset_in_request *req, int trunc) 3608 { 3609 uint32_t seq; 3610 int len, i; 3611 int number_entries; 3612 uint16_t temp; 3613 3614 /* 3615 * peer wants me to send a str-reset to him for my outgoing seq's if 3616 * seq_in is right. 3617 */ 3618 struct sctp_association *asoc = &stcb->asoc; 3619 3620 seq = ntohl(req->request_seq); 3621 if (asoc->str_reset_seq_in == seq) { 3622 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3623 if ((asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ) == 0) { 3624 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3625 } else if (trunc) { 3626 /* Can't do it, since they exceeded our buffer size */ 3627 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3628 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) { 3629 len = ntohs(req->ph.param_length); 3630 number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t)); 3631 if (number_entries) { 3632 for (i = 0; i < number_entries; i++) { 3633 temp = ntohs(req->list_of_streams[i]); 3634 if (temp >= stcb->asoc.streamoutcnt) { 3635 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3636 goto bad_boy; 3637 } 3638 req->list_of_streams[i] = temp; 3639 } 3640 for (i = 0; i < number_entries; i++) { 3641 if (stcb->asoc.strmout[req->list_of_streams[i]].state == SCTP_STREAM_OPEN) { 3642 stcb->asoc.strmout[req->list_of_streams[i]].state = SCTP_STREAM_RESET_PENDING; 3643 } 3644 } 3645 } else { 3646 /* Its all */ 3647 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3648 if (stcb->asoc.strmout[i].state == SCTP_STREAM_OPEN) 3649 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_PENDING; 3650 } 3651 } 3652 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3653 } else { 3654 /* Can't do it, since we have sent one out */ 3655 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 3656 } 3657 bad_boy: 3658 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3659 asoc->str_reset_seq_in++; 3660 } else if (asoc->str_reset_seq_in - 1 == seq) { 3661 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3662 } else if (asoc->str_reset_seq_in - 2 == seq) { 3663 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3664 } else { 3665 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3666 } 3667 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED); 3668 } 3669 3670 static int 3671 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb, 3672 struct sctp_tmit_chunk *chk, 3673 struct sctp_stream_reset_tsn_request *req) 3674 { 3675 /* reset all in and out and update the tsn */ 3676 /* 3677 * A) reset my str-seq's on in and out. B) Select a receive next, 3678 * and set cum-ack to it. Also process this selected number as a 3679 * fwd-tsn as well. C) set in the response my next sending seq. 3680 */ 3681 struct sctp_forward_tsn_chunk fwdtsn; 3682 struct sctp_association *asoc = &stcb->asoc; 3683 int abort_flag = 0; 3684 uint32_t seq; 3685 3686 seq = ntohl(req->request_seq); 3687 if (asoc->str_reset_seq_in == seq) { 3688 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3689 if ((asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ) == 0) { 3690 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3691 } else { 3692 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3693 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3694 fwdtsn.ch.chunk_flags = 0; 3695 fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1); 3696 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3697 if (abort_flag) { 3698 return (1); 3699 } 3700 asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA; 3701 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3702 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3703 } 3704 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map; 3705 asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1; 3706 memset(asoc->mapping_array, 0, asoc->mapping_array_size); 3707 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 3708 memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size); 3709 atomic_add_int(&asoc->sending_seq, 1); 3710 /* save off historical data for retrans */ 3711 asoc->last_sending_seq[1] = asoc->last_sending_seq[0]; 3712 asoc->last_sending_seq[0] = asoc->sending_seq; 3713 asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0]; 3714 asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn; 3715 sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL); 3716 sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL); 3717 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3718 sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0); 3719 } 3720 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3721 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3722 asoc->str_reset_seq_in++; 3723 } else if (asoc->str_reset_seq_in - 1 == seq) { 3724 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3725 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3726 } else if (asoc->str_reset_seq_in - 2 == seq) { 3727 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1], 3728 asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]); 3729 } else { 3730 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3731 } 3732 return (0); 3733 } 3734 3735 static void 3736 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb, 3737 struct sctp_tmit_chunk *chk, 3738 struct sctp_stream_reset_out_request *req, int trunc) 3739 { 3740 uint32_t seq, tsn; 3741 int number_entries, len; 3742 struct sctp_association *asoc = &stcb->asoc; 3743 3744 seq = ntohl(req->request_seq); 3745 3746 /* now if its not a duplicate we process it */ 3747 if (asoc->str_reset_seq_in == seq) { 3748 len = ntohs(req->ph.param_length); 3749 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t)); 3750 /* 3751 * the sender is resetting, handle the list issue.. we must 3752 * a) verify if we can do the reset, if so no problem b) If 3753 * we can't do the reset we must copy the request. c) queue 3754 * it, and setup the data in processor to trigger it off 3755 * when needed and dequeue all the queued data. 3756 */ 3757 tsn = ntohl(req->send_reset_at_tsn); 3758 3759 /* move the reset action back one */ 3760 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3761 if ((asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ) == 0) { 3762 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3763 } else if (trunc) { 3764 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3765 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) { 3766 /* we can do it now */ 3767 sctp_reset_in_stream(stcb, number_entries, req->list_of_streams); 3768 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3769 } else { 3770 /* 3771 * we must queue it up and thus wait for the TSN's 3772 * to arrive that are at or before tsn 3773 */ 3774 struct sctp_stream_reset_list *liste; 3775 int siz; 3776 3777 siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t)); 3778 SCTP_MALLOC(liste, struct sctp_stream_reset_list *, 3779 siz, SCTP_M_STRESET); 3780 if (liste == NULL) { 3781 /* gak out of memory */ 3782 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3783 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3784 return; 3785 } 3786 liste->seq = seq; 3787 liste->tsn = tsn; 3788 liste->number_entries = number_entries; 3789 memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t)); 3790 TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp); 3791 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_IN_PROGRESS; 3792 } 3793 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3794 asoc->str_reset_seq_in++; 3795 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3796 /* 3797 * one seq back, just echo back last action since my 3798 * response was lost. 3799 */ 3800 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3801 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3802 /* 3803 * two seq back, just echo back last action since my 3804 * response was lost. 3805 */ 3806 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3807 } else { 3808 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3809 } 3810 } 3811 3812 static void 3813 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 3814 struct sctp_stream_reset_add_strm *str_add) 3815 { 3816 /* 3817 * Peer is requesting to add more streams. If its within our 3818 * max-streams we will allow it. 3819 */ 3820 uint32_t num_stream, i; 3821 uint32_t seq; 3822 struct sctp_association *asoc = &stcb->asoc; 3823 struct sctp_queued_to_read *ctl, *nctl; 3824 3825 /* Get the number. */ 3826 seq = ntohl(str_add->request_seq); 3827 num_stream = ntohs(str_add->number_of_streams); 3828 /* Now what would be the new total? */ 3829 if (asoc->str_reset_seq_in == seq) { 3830 num_stream += stcb->asoc.streamincnt; 3831 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3832 if ((asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ) == 0) { 3833 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3834 } else if ((num_stream > stcb->asoc.max_inbound_streams) || 3835 (num_stream > 0xffff)) { 3836 /* We must reject it they ask for to many */ 3837 denied: 3838 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3839 } else { 3840 /* Ok, we can do that :-) */ 3841 struct sctp_stream_in *oldstrm; 3842 3843 /* save off the old */ 3844 oldstrm = stcb->asoc.strmin; 3845 SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *, 3846 (num_stream * sizeof(struct sctp_stream_in)), 3847 SCTP_M_STRMI); 3848 if (stcb->asoc.strmin == NULL) { 3849 stcb->asoc.strmin = oldstrm; 3850 goto denied; 3851 } 3852 /* copy off the old data */ 3853 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3854 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 3855 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue); 3856 stcb->asoc.strmin[i].sid = i; 3857 stcb->asoc.strmin[i].last_mid_delivered = oldstrm[i].last_mid_delivered; 3858 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started; 3859 stcb->asoc.strmin[i].pd_api_started = oldstrm[i].pd_api_started; 3860 /* now anything on those queues? */ 3861 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next_instrm, nctl) { 3862 TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next_instrm); 3863 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next_instrm); 3864 } 3865 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].uno_inqueue, next_instrm, nctl) { 3866 TAILQ_REMOVE(&oldstrm[i].uno_inqueue, ctl, next_instrm); 3867 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].uno_inqueue, ctl, next_instrm); 3868 } 3869 } 3870 /* Init the new streams */ 3871 for (i = stcb->asoc.streamincnt; i < num_stream; i++) { 3872 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 3873 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue); 3874 stcb->asoc.strmin[i].sid = i; 3875 stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff; 3876 stcb->asoc.strmin[i].pd_api_started = 0; 3877 stcb->asoc.strmin[i].delivery_started = 0; 3878 } 3879 SCTP_FREE(oldstrm, SCTP_M_STRMI); 3880 /* update the size */ 3881 stcb->asoc.streamincnt = num_stream; 3882 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3883 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 3884 } 3885 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3886 asoc->str_reset_seq_in++; 3887 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3888 /* 3889 * one seq back, just echo back last action since my 3890 * response was lost. 3891 */ 3892 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3893 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3894 /* 3895 * two seq back, just echo back last action since my 3896 * response was lost. 3897 */ 3898 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3899 } else { 3900 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3901 } 3902 } 3903 3904 static void 3905 sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 3906 struct sctp_stream_reset_add_strm *str_add) 3907 { 3908 /* 3909 * Peer is requesting to add more streams. If its within our 3910 * max-streams we will allow it. 3911 */ 3912 uint16_t num_stream; 3913 uint32_t seq; 3914 struct sctp_association *asoc = &stcb->asoc; 3915 3916 /* Get the number. */ 3917 seq = ntohl(str_add->request_seq); 3918 num_stream = ntohs(str_add->number_of_streams); 3919 /* Now what would be the new total? */ 3920 if (asoc->str_reset_seq_in == seq) { 3921 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3922 if ((asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ) == 0) { 3923 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3924 } else if (stcb->asoc.stream_reset_outstanding) { 3925 /* We must reject it we have something pending */ 3926 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 3927 } else { 3928 /* Ok, we can do that :-) */ 3929 int mychk; 3930 3931 mychk = stcb->asoc.streamoutcnt; 3932 mychk += num_stream; 3933 if (mychk < 0x10000) { 3934 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3935 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 1, num_stream, 0, 1)) { 3936 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3937 } 3938 } else { 3939 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3940 } 3941 } 3942 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]); 3943 asoc->str_reset_seq_in++; 3944 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3945 /* 3946 * one seq back, just echo back last action since my 3947 * response was lost. 3948 */ 3949 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3950 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3951 /* 3952 * two seq back, just echo back last action since my 3953 * response was lost. 3954 */ 3955 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3956 } else { 3957 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3958 } 3959 } 3960 3961 #ifdef __GNUC__ 3962 __attribute__((noinline)) 3963 #endif 3964 static int 3965 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset, 3966 struct sctp_chunkhdr *ch_req) 3967 { 3968 uint16_t remaining_length, param_len, ptype; 3969 struct sctp_paramhdr pstore; 3970 uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE]; 3971 uint32_t seq = 0; 3972 int num_req = 0; 3973 int trunc = 0; 3974 struct sctp_tmit_chunk *chk; 3975 struct sctp_chunkhdr *ch; 3976 struct sctp_paramhdr *ph; 3977 int ret_code = 0; 3978 int num_param = 0; 3979 3980 /* now it may be a reset or a reset-response */ 3981 remaining_length = ntohs(ch_req->chunk_length) - sizeof(struct sctp_chunkhdr); 3982 3983 /* setup for adding the response */ 3984 sctp_alloc_a_chunk(stcb, chk); 3985 if (chk == NULL) { 3986 return (ret_code); 3987 } 3988 chk->copy_by_ref = 0; 3989 chk->rec.chunk_id.id = SCTP_STREAM_RESET; 3990 chk->rec.chunk_id.can_take_data = 0; 3991 chk->flags = 0; 3992 chk->asoc = &stcb->asoc; 3993 chk->no_fr_allowed = 0; 3994 chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr); 3995 chk->book_size_scale = 0; 3996 chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA); 3997 if (chk->data == NULL) { 3998 strres_nochunk: 3999 if (chk->data) { 4000 sctp_m_freem(chk->data); 4001 chk->data = NULL; 4002 } 4003 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 4004 return (ret_code); 4005 } 4006 SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD); 4007 4008 /* setup chunk parameters */ 4009 chk->sent = SCTP_DATAGRAM_UNSENT; 4010 chk->snd_count = 0; 4011 chk->whoTo = NULL; 4012 4013 ch = mtod(chk->data, struct sctp_chunkhdr *); 4014 ch->chunk_type = SCTP_STREAM_RESET; 4015 ch->chunk_flags = 0; 4016 ch->chunk_length = htons(chk->send_size); 4017 SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size); 4018 offset += sizeof(struct sctp_chunkhdr); 4019 while (remaining_length >= sizeof(struct sctp_paramhdr)) { 4020 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *)&pstore); 4021 if (ph == NULL) { 4022 /* TSNH */ 4023 break; 4024 } 4025 param_len = ntohs(ph->param_length); 4026 if ((param_len > remaining_length) || 4027 (param_len < (sizeof(struct sctp_paramhdr) + sizeof(uint32_t)))) { 4028 /* bad parameter length */ 4029 break; 4030 } 4031 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, sizeof(cstore)), 4032 (uint8_t *)&cstore); 4033 if (ph == NULL) { 4034 /* TSNH */ 4035 break; 4036 } 4037 ptype = ntohs(ph->param_type); 4038 num_param++; 4039 if (param_len > sizeof(cstore)) { 4040 trunc = 1; 4041 } else { 4042 trunc = 0; 4043 } 4044 if (num_param > SCTP_MAX_RESET_PARAMS) { 4045 /* hit the max of parameters already sorry.. */ 4046 break; 4047 } 4048 if (ptype == SCTP_STR_RESET_OUT_REQUEST) { 4049 struct sctp_stream_reset_out_request *req_out; 4050 4051 if (param_len < sizeof(struct sctp_stream_reset_out_request)) { 4052 break; 4053 } 4054 req_out = (struct sctp_stream_reset_out_request *)ph; 4055 num_req++; 4056 if (stcb->asoc.stream_reset_outstanding) { 4057 seq = ntohl(req_out->response_seq); 4058 if (seq == stcb->asoc.str_reset_seq_out) { 4059 /* implicit ack */ 4060 (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL); 4061 } 4062 } 4063 sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc); 4064 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) { 4065 struct sctp_stream_reset_add_strm *str_add; 4066 4067 if (param_len < sizeof(struct sctp_stream_reset_add_strm)) { 4068 break; 4069 } 4070 str_add = (struct sctp_stream_reset_add_strm *)ph; 4071 num_req++; 4072 sctp_handle_str_reset_add_strm(stcb, chk, str_add); 4073 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) { 4074 struct sctp_stream_reset_add_strm *str_add; 4075 4076 if (param_len < sizeof(struct sctp_stream_reset_add_strm)) { 4077 break; 4078 } 4079 str_add = (struct sctp_stream_reset_add_strm *)ph; 4080 num_req++; 4081 sctp_handle_str_reset_add_out_strm(stcb, chk, str_add); 4082 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) { 4083 struct sctp_stream_reset_in_request *req_in; 4084 4085 num_req++; 4086 req_in = (struct sctp_stream_reset_in_request *)ph; 4087 sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc); 4088 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) { 4089 struct sctp_stream_reset_tsn_request *req_tsn; 4090 4091 num_req++; 4092 req_tsn = (struct sctp_stream_reset_tsn_request *)ph; 4093 if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) { 4094 ret_code = 1; 4095 goto strres_nochunk; 4096 } 4097 /* no more */ 4098 break; 4099 } else if (ptype == SCTP_STR_RESET_RESPONSE) { 4100 struct sctp_stream_reset_response *resp; 4101 uint32_t result; 4102 4103 if (param_len < sizeof(struct sctp_stream_reset_response)) { 4104 break; 4105 } 4106 resp = (struct sctp_stream_reset_response *)ph; 4107 seq = ntohl(resp->response_seq); 4108 result = ntohl(resp->result); 4109 if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) { 4110 ret_code = 1; 4111 goto strres_nochunk; 4112 } 4113 } else { 4114 break; 4115 } 4116 offset += SCTP_SIZE32(param_len); 4117 if (remaining_length >= SCTP_SIZE32(param_len)) { 4118 remaining_length -= SCTP_SIZE32(param_len); 4119 } else { 4120 remaining_length = 0; 4121 } 4122 } 4123 if (num_req == 0) { 4124 /* we have no response free the stuff */ 4125 goto strres_nochunk; 4126 } 4127 /* ok we have a chunk to link in */ 4128 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, 4129 chk, 4130 sctp_next); 4131 stcb->asoc.ctrl_queue_cnt++; 4132 return (ret_code); 4133 } 4134 4135 /* 4136 * Handle a router or endpoints report of a packet loss, there are two ways 4137 * to handle this, either we get the whole packet and must disect it 4138 * ourselves (possibly with truncation and or corruption) or it is a summary 4139 * from a middle box that did the disecting for us. 4140 */ 4141 static void 4142 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp, 4143 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 4144 { 4145 struct sctp_chunk_desc desc; 4146 struct sctp_chunkhdr *chk_hdr; 4147 struct sctp_data_chunk *data_chunk; 4148 struct sctp_idata_chunk *idata_chunk; 4149 uint32_t bottle_bw, on_queue; 4150 uint32_t offset, chk_len; 4151 uint16_t pktdrp_len; 4152 uint8_t pktdrp_flags; 4153 4154 KASSERT(sizeof(struct sctp_pktdrop_chunk) <= limit, 4155 ("PKTDROP chunk too small")); 4156 pktdrp_flags = cp->ch.chunk_flags; 4157 pktdrp_len = ntohs(cp->ch.chunk_length); 4158 KASSERT(limit <= pktdrp_len, ("Inconsistent limit")); 4159 if (pktdrp_flags & SCTP_PACKET_TRUNCATED) { 4160 if (ntohs(cp->trunc_len) <= pktdrp_len - sizeof(struct sctp_pktdrop_chunk)) { 4161 /* The peer plays games with us. */ 4162 return; 4163 } 4164 } 4165 limit -= sizeof(struct sctp_pktdrop_chunk); 4166 offset = 0; 4167 if (offset == limit) { 4168 if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) { 4169 SCTP_STAT_INCR(sctps_pdrpbwrpt); 4170 } 4171 } else if (offset + sizeof(struct sctphdr) > limit) { 4172 /* Only a partial SCTP common header. */ 4173 SCTP_STAT_INCR(sctps_pdrpcrupt); 4174 offset = limit; 4175 } else { 4176 /* XXX: Check embedded SCTP common header. */ 4177 offset += sizeof(struct sctphdr); 4178 } 4179 /* Now parse through the chunks themselves. */ 4180 while (offset < limit) { 4181 if (offset + sizeof(struct sctp_chunkhdr) > limit) { 4182 SCTP_STAT_INCR(sctps_pdrpcrupt); 4183 break; 4184 } 4185 chk_hdr = (struct sctp_chunkhdr *)(cp->data + offset); 4186 desc.chunk_type = chk_hdr->chunk_type; 4187 /* get amount we need to move */ 4188 chk_len = (uint32_t)ntohs(chk_hdr->chunk_length); 4189 if (chk_len < sizeof(struct sctp_chunkhdr)) { 4190 /* Someone is lying... */ 4191 break; 4192 } 4193 if (desc.chunk_type == SCTP_DATA) { 4194 if (stcb->asoc.idata_supported) { 4195 /* Some is playing games with us. */ 4196 break; 4197 } 4198 if (chk_len <= sizeof(struct sctp_data_chunk)) { 4199 /* Some is playing games with us. */ 4200 break; 4201 } 4202 if (chk_len < sizeof(struct sctp_data_chunk) + SCTP_NUM_DB_TO_VERIFY) { 4203 /* 4204 * Not enough data bytes available in the 4205 * chunk. 4206 */ 4207 SCTP_STAT_INCR(sctps_pdrpnedat); 4208 goto next_chunk; 4209 } 4210 if (offset + sizeof(struct sctp_data_chunk) + SCTP_NUM_DB_TO_VERIFY > limit) { 4211 /* Not enough data in buffer. */ 4212 break; 4213 } 4214 data_chunk = (struct sctp_data_chunk *)(cp->data + offset); 4215 memcpy(desc.data_bytes, data_chunk + 1, SCTP_NUM_DB_TO_VERIFY); 4216 desc.tsn_ifany = data_chunk->dp.tsn; 4217 if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) { 4218 SCTP_STAT_INCR(sctps_pdrpmbda); 4219 } 4220 } else if (desc.chunk_type == SCTP_IDATA) { 4221 if (!stcb->asoc.idata_supported) { 4222 /* Some is playing games with us. */ 4223 break; 4224 } 4225 if (chk_len <= sizeof(struct sctp_idata_chunk)) { 4226 /* Some is playing games with us. */ 4227 break; 4228 } 4229 if (chk_len < sizeof(struct sctp_idata_chunk) + SCTP_NUM_DB_TO_VERIFY) { 4230 /* 4231 * Not enough data bytes available in the 4232 * chunk. 4233 */ 4234 SCTP_STAT_INCR(sctps_pdrpnedat); 4235 goto next_chunk; 4236 } 4237 if (offset + sizeof(struct sctp_idata_chunk) + SCTP_NUM_DB_TO_VERIFY > limit) { 4238 /* Not enough data in buffer. */ 4239 break; 4240 } 4241 idata_chunk = (struct sctp_idata_chunk *)(cp->data + offset); 4242 memcpy(desc.data_bytes, idata_chunk + 1, SCTP_NUM_DB_TO_VERIFY); 4243 desc.tsn_ifany = idata_chunk->dp.tsn; 4244 if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) { 4245 SCTP_STAT_INCR(sctps_pdrpmbda); 4246 } 4247 } else { 4248 if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) { 4249 SCTP_STAT_INCR(sctps_pdrpmbct); 4250 } 4251 } 4252 if (process_chunk_drop(stcb, &desc, net, pktdrp_flags)) { 4253 SCTP_STAT_INCR(sctps_pdrppdbrk); 4254 break; 4255 } 4256 next_chunk: 4257 offset += SCTP_SIZE32(chk_len); 4258 } 4259 /* Now update any rwnd --- possibly */ 4260 if ((pktdrp_flags & SCTP_FROM_MIDDLE_BOX) == 0) { 4261 /* From a peer, we get a rwnd report */ 4262 uint32_t a_rwnd; 4263 4264 SCTP_STAT_INCR(sctps_pdrpfehos); 4265 4266 bottle_bw = ntohl(cp->bottle_bw); 4267 on_queue = ntohl(cp->current_onq); 4268 if (bottle_bw && on_queue) { 4269 /* a rwnd report is in here */ 4270 if (bottle_bw > on_queue) 4271 a_rwnd = bottle_bw - on_queue; 4272 else 4273 a_rwnd = 0; 4274 4275 if (a_rwnd == 0) 4276 stcb->asoc.peers_rwnd = 0; 4277 else { 4278 if (a_rwnd > stcb->asoc.total_flight) { 4279 stcb->asoc.peers_rwnd = 4280 a_rwnd - stcb->asoc.total_flight; 4281 } else { 4282 stcb->asoc.peers_rwnd = 0; 4283 } 4284 if (stcb->asoc.peers_rwnd < 4285 stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 4286 /* SWS sender side engages */ 4287 stcb->asoc.peers_rwnd = 0; 4288 } 4289 } 4290 } 4291 } else { 4292 SCTP_STAT_INCR(sctps_pdrpfmbox); 4293 } 4294 4295 /* now middle boxes in sat networks get a cwnd bump */ 4296 if ((pktdrp_flags & SCTP_FROM_MIDDLE_BOX) && 4297 (stcb->asoc.sat_t3_loss_recovery == 0) && 4298 (stcb->asoc.sat_network)) { 4299 /* 4300 * This is debatable but for sat networks it makes sense 4301 * Note if a T3 timer has went off, we will prohibit any 4302 * changes to cwnd until we exit the t3 loss recovery. 4303 */ 4304 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb, 4305 net, cp, &bottle_bw, &on_queue); 4306 } 4307 } 4308 4309 /* 4310 * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to 4311 * still contain IP/SCTP header - stcb: is the tcb found for this packet - 4312 * offset: offset into the mbuf chain to first chunkhdr - length: is the 4313 * length of the complete packet outputs: - length: modified to remaining 4314 * length after control processing - netp: modified to new sctp_nets after 4315 * cookie-echo processing - return NULL to discard the packet (ie. no asoc, 4316 * bad packet,...) otherwise return the tcb for this packet 4317 */ 4318 #ifdef __GNUC__ 4319 __attribute__((noinline)) 4320 #endif 4321 static struct sctp_tcb * 4322 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length, 4323 struct sockaddr *src, struct sockaddr *dst, 4324 struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp, 4325 struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen, 4326 uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum, 4327 uint32_t vrf_id, uint16_t port) 4328 { 4329 struct sctp_association *asoc; 4330 struct mbuf *op_err; 4331 char msg[SCTP_DIAG_INFO_LEN]; 4332 uint32_t vtag_in; 4333 int num_chunks = 0; /* number of control chunks processed */ 4334 uint32_t chk_length, contiguous; 4335 int ret; 4336 int abort_no_unlock = 0; 4337 int ecne_seen = 0; 4338 int abort_flag; 4339 4340 /* 4341 * How big should this be, and should it be alloc'd? Lets try the 4342 * d-mtu-ceiling for now (2k) and that should hopefully work ... 4343 * until we get into jumbo grams and such.. 4344 */ 4345 uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE]; 4346 int got_auth = 0; 4347 uint32_t auth_offset = 0, auth_len = 0; 4348 int auth_skipped = 0; 4349 int asconf_cnt = 0; 4350 4351 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n", 4352 iphlen, *offset, length, (void *)stcb); 4353 4354 if (stcb) { 4355 SCTP_TCB_LOCK_ASSERT(stcb); 4356 } 4357 /* validate chunk header length... */ 4358 if (ntohs(ch->chunk_length) < sizeof(*ch)) { 4359 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n", 4360 ntohs(ch->chunk_length)); 4361 *offset = length; 4362 return (stcb); 4363 } 4364 /* 4365 * validate the verification tag 4366 */ 4367 vtag_in = ntohl(sh->v_tag); 4368 4369 if (ch->chunk_type == SCTP_INITIATION) { 4370 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n", 4371 ntohs(ch->chunk_length), vtag_in); 4372 if (vtag_in != 0) { 4373 /* protocol error- silently discard... */ 4374 SCTP_STAT_INCR(sctps_badvtag); 4375 if (stcb != NULL) { 4376 SCTP_TCB_UNLOCK(stcb); 4377 } 4378 return (NULL); 4379 } 4380 } else if (ch->chunk_type != SCTP_COOKIE_ECHO) { 4381 /* 4382 * If there is no stcb, skip the AUTH chunk and process 4383 * later after a stcb is found (to validate the lookup was 4384 * valid. 4385 */ 4386 if ((ch->chunk_type == SCTP_AUTHENTICATION) && 4387 (stcb == NULL) && 4388 (inp->auth_supported == 1)) { 4389 /* save this chunk for later processing */ 4390 auth_skipped = 1; 4391 auth_offset = *offset; 4392 auth_len = ntohs(ch->chunk_length); 4393 4394 /* (temporarily) move past this chunk */ 4395 *offset += SCTP_SIZE32(auth_len); 4396 if (*offset >= length) { 4397 /* no more data left in the mbuf chain */ 4398 *offset = length; 4399 return (NULL); 4400 } 4401 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4402 sizeof(struct sctp_chunkhdr), chunk_buf); 4403 } 4404 if (ch == NULL) { 4405 /* Help */ 4406 *offset = length; 4407 return (stcb); 4408 } 4409 if (ch->chunk_type == SCTP_COOKIE_ECHO) { 4410 goto process_control_chunks; 4411 } 4412 /* 4413 * first check if it's an ASCONF with an unknown src addr we 4414 * need to look inside to find the association 4415 */ 4416 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) { 4417 struct sctp_chunkhdr *asconf_ch = ch; 4418 uint32_t asconf_offset = 0, asconf_len = 0; 4419 4420 /* inp's refcount may be reduced */ 4421 SCTP_INP_INCR_REF(inp); 4422 4423 asconf_offset = *offset; 4424 do { 4425 asconf_len = ntohs(asconf_ch->chunk_length); 4426 if (asconf_len < sizeof(struct sctp_asconf_paramhdr)) 4427 break; 4428 stcb = sctp_findassociation_ep_asconf(m, 4429 *offset, 4430 dst, 4431 sh, &inp, netp, vrf_id); 4432 if (stcb != NULL) 4433 break; 4434 asconf_offset += SCTP_SIZE32(asconf_len); 4435 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset, 4436 sizeof(struct sctp_chunkhdr), chunk_buf); 4437 } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF); 4438 if (stcb == NULL) { 4439 /* 4440 * reduce inp's refcount if not reduced in 4441 * sctp_findassociation_ep_asconf(). 4442 */ 4443 SCTP_INP_DECR_REF(inp); 4444 } 4445 4446 /* now go back and verify any auth chunk to be sure */ 4447 if (auth_skipped && (stcb != NULL)) { 4448 struct sctp_auth_chunk *auth; 4449 4450 if (auth_len <= SCTP_CHUNK_BUFFER_SIZE) { 4451 auth = (struct sctp_auth_chunk *)sctp_m_getptr(m, auth_offset, auth_len, chunk_buf); 4452 got_auth = 1; 4453 auth_skipped = 0; 4454 } else { 4455 auth = NULL; 4456 } 4457 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, 4458 auth_offset)) { 4459 /* auth HMAC failed so dump it */ 4460 *offset = length; 4461 return (stcb); 4462 } else { 4463 /* remaining chunks are HMAC checked */ 4464 stcb->asoc.authenticated = 1; 4465 } 4466 } 4467 } 4468 if (stcb == NULL) { 4469 SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 4470 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4471 msg); 4472 /* no association, so it's out of the blue... */ 4473 sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, op_err, 4474 mflowtype, mflowid, inp->fibnum, 4475 vrf_id, port); 4476 *offset = length; 4477 return (NULL); 4478 } 4479 asoc = &stcb->asoc; 4480 /* ABORT and SHUTDOWN can use either v_tag... */ 4481 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) || 4482 (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) || 4483 (ch->chunk_type == SCTP_PACKET_DROPPED)) { 4484 /* Take the T-bit always into account. */ 4485 if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) && 4486 (vtag_in == asoc->my_vtag)) || 4487 (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) && 4488 (asoc->peer_vtag != htonl(0)) && 4489 (vtag_in == asoc->peer_vtag))) { 4490 /* this is valid */ 4491 } else { 4492 /* drop this packet... */ 4493 SCTP_STAT_INCR(sctps_badvtag); 4494 if (stcb != NULL) { 4495 SCTP_TCB_UNLOCK(stcb); 4496 } 4497 return (NULL); 4498 } 4499 } else { 4500 /* for all other chunks, vtag must match */ 4501 if (vtag_in != asoc->my_vtag) { 4502 /* invalid vtag... */ 4503 SCTPDBG(SCTP_DEBUG_INPUT3, 4504 "invalid vtag: %xh, expect %xh\n", 4505 vtag_in, asoc->my_vtag); 4506 SCTP_STAT_INCR(sctps_badvtag); 4507 if (stcb != NULL) { 4508 SCTP_TCB_UNLOCK(stcb); 4509 } 4510 *offset = length; 4511 return (NULL); 4512 } 4513 } 4514 } /* end if !SCTP_COOKIE_ECHO */ 4515 /* 4516 * process all control chunks... 4517 */ 4518 if (((ch->chunk_type == SCTP_SELECTIVE_ACK) || 4519 (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) || 4520 (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) && 4521 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 4522 /* implied cookie-ack.. we must have lost the ack */ 4523 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, 4524 *netp); 4525 } 4526 4527 process_control_chunks: 4528 while (IS_SCTP_CONTROL(ch)) { 4529 /* validate chunk length */ 4530 chk_length = ntohs(ch->chunk_length); 4531 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n", 4532 ch->chunk_type, chk_length); 4533 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length); 4534 if (chk_length < sizeof(*ch) || 4535 (*offset + (int)chk_length) > length) { 4536 *offset = length; 4537 return (stcb); 4538 } 4539 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks); 4540 /* 4541 * INIT and INIT-ACK only gets the init ack "header" portion 4542 * only because we don't have to process the peer's COOKIE. 4543 * All others get a complete chunk. 4544 */ 4545 switch (ch->chunk_type) { 4546 case SCTP_INITIATION: 4547 contiguous = sizeof(struct sctp_init_chunk); 4548 break; 4549 case SCTP_INITIATION_ACK: 4550 contiguous = sizeof(struct sctp_init_ack_chunk); 4551 break; 4552 default: 4553 contiguous = min(chk_length, sizeof(chunk_buf)); 4554 break; 4555 } 4556 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4557 contiguous, 4558 chunk_buf); 4559 if (ch == NULL) { 4560 *offset = length; 4561 return (stcb); 4562 } 4563 4564 num_chunks++; 4565 /* Save off the last place we got a control from */ 4566 if (stcb != NULL) { 4567 if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) { 4568 /* 4569 * allow last_control to be NULL if 4570 * ASCONF... ASCONF processing will find the 4571 * right net later 4572 */ 4573 if ((netp != NULL) && (*netp != NULL)) 4574 stcb->asoc.last_control_chunk_from = *netp; 4575 } 4576 } 4577 #ifdef SCTP_AUDITING_ENABLED 4578 sctp_audit_log(0xB0, ch->chunk_type); 4579 #endif 4580 4581 /* check to see if this chunk required auth, but isn't */ 4582 if ((stcb != NULL) && 4583 sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) && 4584 !stcb->asoc.authenticated) { 4585 /* "silently" ignore */ 4586 SCTP_STAT_INCR(sctps_recvauthmissing); 4587 goto next_chunk; 4588 } 4589 switch (ch->chunk_type) { 4590 case SCTP_INITIATION: 4591 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n"); 4592 /* The INIT chunk must be the only chunk. */ 4593 if ((num_chunks > 1) || 4594 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4595 /* 4596 * RFC 4960bis requires stopping the 4597 * processing of the packet. 4598 */ 4599 *offset = length; 4600 return (stcb); 4601 } 4602 /* Honor our resource limit. */ 4603 if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) { 4604 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 4605 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err, 4606 mflowtype, mflowid, inp->fibnum, 4607 vrf_id, port); 4608 *offset = length; 4609 if (stcb != NULL) { 4610 SCTP_TCB_UNLOCK(stcb); 4611 } 4612 return (NULL); 4613 } 4614 sctp_handle_init(m, iphlen, *offset, src, dst, sh, 4615 (struct sctp_init_chunk *)ch, inp, 4616 stcb, *netp, 4617 mflowtype, mflowid, 4618 vrf_id, port); 4619 *offset = length; 4620 if (stcb != NULL) { 4621 SCTP_TCB_UNLOCK(stcb); 4622 } 4623 return (NULL); 4624 break; 4625 case SCTP_PAD_CHUNK: 4626 break; 4627 case SCTP_INITIATION_ACK: 4628 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT_ACK\n"); 4629 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4630 /* We are not interested anymore */ 4631 if ((stcb != NULL) && (stcb->asoc.total_output_queue_size)) { 4632 ; 4633 } else { 4634 *offset = length; 4635 if (stcb != NULL) { 4636 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 4637 SCTP_FROM_SCTP_INPUT + SCTP_LOC_29); 4638 } 4639 return (NULL); 4640 } 4641 } 4642 /* The INIT-ACK chunk must be the only chunk. */ 4643 if ((num_chunks > 1) || 4644 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4645 *offset = length; 4646 return (stcb); 4647 } 4648 if ((netp != NULL) && (*netp != NULL)) { 4649 ret = sctp_handle_init_ack(m, iphlen, *offset, 4650 src, dst, sh, 4651 (struct sctp_init_ack_chunk *)ch, 4652 stcb, *netp, 4653 &abort_no_unlock, 4654 mflowtype, mflowid, 4655 vrf_id); 4656 } else { 4657 ret = -1; 4658 } 4659 *offset = length; 4660 if (abort_no_unlock) { 4661 return (NULL); 4662 } 4663 /* 4664 * Special case, I must call the output routine to 4665 * get the cookie echoed 4666 */ 4667 if ((stcb != NULL) && (ret == 0)) { 4668 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 4669 } 4670 return (stcb); 4671 break; 4672 case SCTP_SELECTIVE_ACK: 4673 case SCTP_NR_SELECTIVE_ACK: 4674 { 4675 int abort_now = 0; 4676 uint32_t a_rwnd, cum_ack; 4677 uint16_t num_seg, num_nr_seg, num_dup; 4678 uint8_t flags; 4679 int offset_seg, offset_dup; 4680 4681 SCTPDBG(SCTP_DEBUG_INPUT3, "%s\n", 4682 ch->chunk_type == SCTP_SELECTIVE_ACK ? "SCTP_SACK" : "SCTP_NR_SACK"); 4683 SCTP_STAT_INCR(sctps_recvsacks); 4684 if (stcb == NULL) { 4685 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing %s chunk\n", 4686 (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK"); 4687 break; 4688 } 4689 if (ch->chunk_type == SCTP_SELECTIVE_ACK) { 4690 if (chk_length < sizeof(struct sctp_sack_chunk)) { 4691 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n"); 4692 break; 4693 } 4694 } else { 4695 if (stcb->asoc.nrsack_supported == 0) { 4696 goto unknown_chunk; 4697 } 4698 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) { 4699 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR_SACK chunk, too small\n"); 4700 break; 4701 } 4702 } 4703 if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4704 /*- 4705 * If we have sent a shutdown-ack, we will pay no 4706 * attention to a sack sent in to us since 4707 * we don't care anymore. 4708 */ 4709 break; 4710 } 4711 flags = ch->chunk_flags; 4712 if (ch->chunk_type == SCTP_SELECTIVE_ACK) { 4713 struct sctp_sack_chunk *sack; 4714 4715 sack = (struct sctp_sack_chunk *)ch; 4716 cum_ack = ntohl(sack->sack.cum_tsn_ack); 4717 num_seg = ntohs(sack->sack.num_gap_ack_blks); 4718 num_nr_seg = 0; 4719 num_dup = ntohs(sack->sack.num_dup_tsns); 4720 a_rwnd = ntohl(sack->sack.a_rwnd); 4721 if (sizeof(struct sctp_sack_chunk) + 4722 num_seg * sizeof(struct sctp_gap_ack_block) + 4723 num_dup * sizeof(uint32_t) != chk_length) { 4724 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n"); 4725 break; 4726 } 4727 offset_seg = *offset + sizeof(struct sctp_sack_chunk); 4728 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 4729 } else { 4730 struct sctp_nr_sack_chunk *nr_sack; 4731 4732 nr_sack = (struct sctp_nr_sack_chunk *)ch; 4733 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack); 4734 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks); 4735 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks); 4736 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns); 4737 a_rwnd = ntohl(nr_sack->nr_sack.a_rwnd); 4738 if (sizeof(struct sctp_nr_sack_chunk) + 4739 (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) + 4740 num_dup * sizeof(uint32_t) != chk_length) { 4741 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n"); 4742 break; 4743 } 4744 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk); 4745 offset_dup = offset_seg + (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block); 4746 } 4747 SCTPDBG(SCTP_DEBUG_INPUT3, "%s process cum_ack:%x num_seg:%d a_rwnd:%d\n", 4748 (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK", 4749 cum_ack, num_seg, a_rwnd); 4750 stcb->asoc.seen_a_sack_this_pkt = 1; 4751 if ((stcb->asoc.pr_sctp_cnt == 0) && 4752 (num_seg == 0) && (num_nr_seg == 0) && 4753 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 4754 (stcb->asoc.saw_sack_with_frags == 0) && 4755 (stcb->asoc.saw_sack_with_nr_frags == 0) && 4756 (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) { 4757 /* 4758 * We have a SIMPLE sack having no 4759 * prior segments and data on sent 4760 * queue to be acked. Use the faster 4761 * path sack processing. We also 4762 * allow window update sacks with no 4763 * missing segments to go this way 4764 * too. 4765 */ 4766 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, 4767 &abort_now, ecne_seen); 4768 } else { 4769 if ((netp != NULL) && (*netp != NULL)) { 4770 sctp_handle_sack(m, offset_seg, offset_dup, stcb, 4771 num_seg, num_nr_seg, num_dup, &abort_now, flags, 4772 cum_ack, a_rwnd, ecne_seen); 4773 } 4774 } 4775 if (abort_now) { 4776 /* ABORT signal from sack processing */ 4777 *offset = length; 4778 return (NULL); 4779 } 4780 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 4781 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 4782 (stcb->asoc.stream_queue_cnt == 0)) { 4783 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 4784 } 4785 break; 4786 } 4787 case SCTP_HEARTBEAT_REQUEST: 4788 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n"); 4789 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 4790 SCTP_STAT_INCR(sctps_recvheartbeat); 4791 sctp_send_heartbeat_ack(stcb, m, *offset, 4792 chk_length, *netp); 4793 } 4794 break; 4795 case SCTP_HEARTBEAT_ACK: 4796 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT_ACK\n"); 4797 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) { 4798 /* Its not ours */ 4799 break; 4800 } 4801 SCTP_STAT_INCR(sctps_recvheartbeatack); 4802 if ((netp != NULL) && (*netp != NULL)) { 4803 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch, 4804 stcb, *netp); 4805 } 4806 break; 4807 case SCTP_ABORT_ASSOCIATION: 4808 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n", 4809 (void *)stcb); 4810 *offset = length; 4811 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 4812 if (sctp_handle_abort((struct sctp_abort_chunk *)ch, stcb, *netp)) { 4813 return (NULL); 4814 } else { 4815 return (stcb); 4816 } 4817 } else { 4818 return (NULL); 4819 } 4820 break; 4821 case SCTP_SHUTDOWN: 4822 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n", 4823 (void *)stcb); 4824 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) { 4825 break; 4826 } 4827 if ((netp != NULL) && (*netp != NULL)) { 4828 abort_flag = 0; 4829 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch, 4830 stcb, *netp, &abort_flag); 4831 if (abort_flag) { 4832 *offset = length; 4833 return (NULL); 4834 } 4835 } 4836 break; 4837 case SCTP_SHUTDOWN_ACK: 4838 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_ACK, stcb %p\n", (void *)stcb); 4839 if ((chk_length == sizeof(struct sctp_shutdown_ack_chunk)) && 4840 (stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 4841 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp); 4842 *offset = length; 4843 return (NULL); 4844 } 4845 break; 4846 case SCTP_OPERATION_ERROR: 4847 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP_ERR\n"); 4848 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL) && 4849 sctp_handle_error(ch, stcb, *netp, contiguous) < 0) { 4850 *offset = length; 4851 return (NULL); 4852 } 4853 break; 4854 case SCTP_COOKIE_ECHO: 4855 SCTPDBG(SCTP_DEBUG_INPUT3, 4856 "SCTP_COOKIE_ECHO, stcb %p\n", (void *)stcb); 4857 if ((stcb != NULL) && (stcb->asoc.total_output_queue_size > 0)) { 4858 ; 4859 } else { 4860 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4861 /* We are not interested anymore */ 4862 abend: 4863 if (stcb != NULL) { 4864 SCTP_TCB_UNLOCK(stcb); 4865 } 4866 *offset = length; 4867 return (NULL); 4868 } 4869 } 4870 /*- 4871 * First are we accepting? We do this again here 4872 * since it is possible that a previous endpoint WAS 4873 * listening responded to a INIT-ACK and then 4874 * closed. We opened and bound.. and are now no 4875 * longer listening. 4876 * 4877 * XXXGL: notes on checking listen queue length. 4878 * 1) SCTP_IS_LISTENING() doesn't necessarily mean 4879 * SOLISTENING(), because a listening "UDP type" 4880 * socket isn't listening in terms of the socket 4881 * layer. It is a normal data flow socket, that 4882 * can fork off new connections. Thus, we should 4883 * look into sol_qlen only in case we are !UDP. 4884 * 2) Checking sol_qlen in general requires locking 4885 * the socket, and this code lacks that. 4886 */ 4887 if ((stcb == NULL) && 4888 (!SCTP_IS_LISTENING(inp) || 4889 (((inp->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE) == 0) && 4890 inp->sctp_socket->sol_qlen >= inp->sctp_socket->sol_qlimit))) { 4891 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 4892 (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) { 4893 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 4894 sctp_abort_association(inp, stcb, m, iphlen, 4895 src, dst, sh, op_err, 4896 mflowtype, mflowid, 4897 vrf_id, port); 4898 } 4899 *offset = length; 4900 return (NULL); 4901 } else { 4902 struct mbuf *ret_buf; 4903 struct sctp_inpcb *linp; 4904 struct sctp_tmit_chunk *chk; 4905 4906 if (inp->sctp_flags & (SCTP_PCB_FLAGS_SOCKET_GONE | 4907 SCTP_PCB_FLAGS_SOCKET_ALLGONE)) { 4908 goto abend; 4909 } 4910 4911 if (stcb) { 4912 linp = NULL; 4913 } else { 4914 linp = inp; 4915 } 4916 4917 if (linp != NULL) { 4918 SCTP_ASOC_CREATE_LOCK(linp); 4919 } 4920 4921 if (netp != NULL) { 4922 struct sctp_tcb *locked_stcb; 4923 4924 locked_stcb = stcb; 4925 ret_buf = 4926 sctp_handle_cookie_echo(m, iphlen, 4927 *offset, 4928 src, dst, 4929 sh, 4930 (struct sctp_cookie_echo_chunk *)ch, 4931 &inp, &stcb, netp, 4932 auth_skipped, 4933 auth_offset, 4934 auth_len, 4935 &locked_stcb, 4936 mflowtype, 4937 mflowid, 4938 vrf_id, 4939 port); 4940 if ((locked_stcb != NULL) && (locked_stcb != stcb)) { 4941 SCTP_TCB_UNLOCK(locked_stcb); 4942 } 4943 if (stcb != NULL) { 4944 SCTP_TCB_LOCK_ASSERT(stcb); 4945 } 4946 } else { 4947 ret_buf = NULL; 4948 } 4949 if (linp != NULL) { 4950 SCTP_ASOC_CREATE_UNLOCK(linp); 4951 } 4952 if (ret_buf == NULL) { 4953 if (stcb != NULL) { 4954 SCTP_TCB_UNLOCK(stcb); 4955 } 4956 SCTPDBG(SCTP_DEBUG_INPUT3, 4957 "GAK, null buffer\n"); 4958 *offset = length; 4959 return (NULL); 4960 } 4961 /* if AUTH skipped, see if it verified... */ 4962 if (auth_skipped) { 4963 got_auth = 1; 4964 auth_skipped = 0; 4965 } 4966 /* Restart the timer if we have pending data */ 4967 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 4968 if (chk->whoTo != NULL) { 4969 break; 4970 } 4971 } 4972 if (chk != NULL) { 4973 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 4974 } 4975 } 4976 break; 4977 case SCTP_COOKIE_ACK: 4978 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE_ACK, stcb %p\n", (void *)stcb); 4979 if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) { 4980 break; 4981 } 4982 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4983 /* We are not interested anymore */ 4984 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4985 ; 4986 } else if (stcb) { 4987 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 4988 SCTP_FROM_SCTP_INPUT + SCTP_LOC_30); 4989 *offset = length; 4990 return (NULL); 4991 } 4992 } 4993 if ((netp != NULL) && (*netp != NULL)) { 4994 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp); 4995 } 4996 break; 4997 case SCTP_ECN_ECHO: 4998 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_ECHO\n"); 4999 if (stcb == NULL) { 5000 break; 5001 } 5002 if (stcb->asoc.ecn_supported == 0) { 5003 goto unknown_chunk; 5004 } 5005 if ((chk_length != sizeof(struct sctp_ecne_chunk)) && 5006 (chk_length != sizeof(struct old_sctp_ecne_chunk))) { 5007 break; 5008 } 5009 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, stcb); 5010 ecne_seen = 1; 5011 break; 5012 case SCTP_ECN_CWR: 5013 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_CWR\n"); 5014 if (stcb == NULL) { 5015 break; 5016 } 5017 if (stcb->asoc.ecn_supported == 0) { 5018 goto unknown_chunk; 5019 } 5020 if (chk_length != sizeof(struct sctp_cwr_chunk)) { 5021 break; 5022 } 5023 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp); 5024 break; 5025 case SCTP_SHUTDOWN_COMPLETE: 5026 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_COMPLETE, stcb %p\n", (void *)stcb); 5027 /* must be first and only chunk */ 5028 if ((num_chunks > 1) || 5029 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 5030 *offset = length; 5031 return (stcb); 5032 } 5033 if ((chk_length == sizeof(struct sctp_shutdown_complete_chunk)) && 5034 (stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 5035 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch, 5036 stcb, *netp); 5037 *offset = length; 5038 return (NULL); 5039 } 5040 break; 5041 case SCTP_ASCONF: 5042 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n"); 5043 if (stcb != NULL) { 5044 if (stcb->asoc.asconf_supported == 0) { 5045 goto unknown_chunk; 5046 } 5047 sctp_handle_asconf(m, *offset, src, 5048 (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0); 5049 asconf_cnt++; 5050 } 5051 break; 5052 case SCTP_ASCONF_ACK: 5053 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF_ACK\n"); 5054 if (stcb == NULL) { 5055 break; 5056 } 5057 if (stcb->asoc.asconf_supported == 0) { 5058 goto unknown_chunk; 5059 } 5060 if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) { 5061 break; 5062 } 5063 if ((netp != NULL) && (*netp != NULL)) { 5064 /* He's alive so give him credit */ 5065 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5066 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5067 stcb->asoc.overall_error_count, 5068 0, 5069 SCTP_FROM_SCTP_INPUT, 5070 __LINE__); 5071 } 5072 stcb->asoc.overall_error_count = 0; 5073 sctp_handle_asconf_ack(m, *offset, 5074 (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock); 5075 if (abort_no_unlock) 5076 return (NULL); 5077 } 5078 break; 5079 case SCTP_FORWARD_CUM_TSN: 5080 case SCTP_IFORWARD_CUM_TSN: 5081 SCTPDBG(SCTP_DEBUG_INPUT3, "%s\n", 5082 ch->chunk_type == SCTP_FORWARD_CUM_TSN ? "FORWARD_TSN" : "I_FORWARD_TSN"); 5083 if (stcb == NULL) { 5084 break; 5085 } 5086 if (stcb->asoc.prsctp_supported == 0) { 5087 goto unknown_chunk; 5088 } 5089 if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) { 5090 break; 5091 } 5092 if (((stcb->asoc.idata_supported == 1) && (ch->chunk_type == SCTP_FORWARD_CUM_TSN)) || 5093 ((stcb->asoc.idata_supported == 0) && (ch->chunk_type == SCTP_IFORWARD_CUM_TSN))) { 5094 if (ch->chunk_type == SCTP_FORWARD_CUM_TSN) { 5095 SCTP_SNPRINTF(msg, sizeof(msg), "%s", "FORWARD-TSN chunk received when I-FORWARD-TSN was negotiated"); 5096 } else { 5097 SCTP_SNPRINTF(msg, sizeof(msg), "%s", "I-FORWARD-TSN chunk received when FORWARD-TSN was negotiated"); 5098 } 5099 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); 5100 sctp_abort_an_association(inp, stcb, op_err, false, SCTP_SO_NOT_LOCKED); 5101 *offset = length; 5102 return (NULL); 5103 } 5104 *fwd_tsn_seen = 1; 5105 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5106 /* We are not interested anymore */ 5107 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 5108 SCTP_FROM_SCTP_INPUT + SCTP_LOC_31); 5109 *offset = length; 5110 return (NULL); 5111 } 5112 /* 5113 * For sending a SACK this looks like DATA chunks. 5114 */ 5115 stcb->asoc.last_data_chunk_from = stcb->asoc.last_control_chunk_from; 5116 abort_flag = 0; 5117 sctp_handle_forward_tsn(stcb, 5118 (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset); 5119 if (abort_flag) { 5120 *offset = length; 5121 return (NULL); 5122 } 5123 break; 5124 case SCTP_STREAM_RESET: 5125 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n"); 5126 if (stcb == NULL) { 5127 break; 5128 } 5129 if (stcb->asoc.reconfig_supported == 0) { 5130 goto unknown_chunk; 5131 } 5132 if (chk_length < sizeof(struct sctp_stream_reset_tsn_req)) { 5133 break; 5134 } 5135 if (sctp_handle_stream_reset(stcb, m, *offset, ch)) { 5136 /* stop processing */ 5137 *offset = length; 5138 return (NULL); 5139 } 5140 break; 5141 case SCTP_PACKET_DROPPED: 5142 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n"); 5143 if (stcb == NULL) { 5144 break; 5145 } 5146 if (stcb->asoc.pktdrop_supported == 0) { 5147 goto unknown_chunk; 5148 } 5149 if (chk_length < sizeof(struct sctp_pktdrop_chunk)) { 5150 break; 5151 } 5152 if ((netp != NULL) && (*netp != NULL)) { 5153 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch, 5154 stcb, *netp, 5155 min(chk_length, contiguous)); 5156 } 5157 break; 5158 case SCTP_AUTHENTICATION: 5159 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n"); 5160 if (stcb == NULL) { 5161 /* save the first AUTH for later processing */ 5162 if (auth_skipped == 0) { 5163 auth_offset = *offset; 5164 auth_len = chk_length; 5165 auth_skipped = 1; 5166 } 5167 /* skip this chunk (temporarily) */ 5168 break; 5169 } 5170 if (stcb->asoc.auth_supported == 0) { 5171 goto unknown_chunk; 5172 } 5173 if ((chk_length < (sizeof(struct sctp_auth_chunk))) || 5174 (chk_length > (sizeof(struct sctp_auth_chunk) + 5175 SCTP_AUTH_DIGEST_LEN_MAX))) { 5176 /* Its not ours */ 5177 *offset = length; 5178 return (stcb); 5179 } 5180 if (got_auth == 1) { 5181 /* skip this chunk... it's already auth'd */ 5182 break; 5183 } 5184 got_auth = 1; 5185 if (sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch, m, *offset)) { 5186 /* auth HMAC failed so dump the packet */ 5187 *offset = length; 5188 return (stcb); 5189 } else { 5190 /* remaining chunks are HMAC checked */ 5191 stcb->asoc.authenticated = 1; 5192 } 5193 break; 5194 5195 default: 5196 unknown_chunk: 5197 /* it's an unknown chunk! */ 5198 if ((ch->chunk_type & 0x40) && 5199 (stcb != NULL) && 5200 (SCTP_GET_STATE(stcb) != SCTP_STATE_EMPTY) && 5201 (SCTP_GET_STATE(stcb) != SCTP_STATE_INUSE) && 5202 (SCTP_GET_STATE(stcb) != SCTP_STATE_COOKIE_WAIT)) { 5203 struct sctp_gen_error_cause *cause; 5204 int len; 5205 5206 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_gen_error_cause), 5207 0, M_NOWAIT, 1, MT_DATA); 5208 if (op_err != NULL) { 5209 len = min(SCTP_SIZE32(chk_length), (uint32_t)(length - *offset)); 5210 cause = mtod(op_err, struct sctp_gen_error_cause *); 5211 cause->code = htons(SCTP_CAUSE_UNRECOG_CHUNK); 5212 cause->length = htons((uint16_t)(len + sizeof(struct sctp_gen_error_cause))); 5213 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_gen_error_cause); 5214 SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(m, *offset, len, M_NOWAIT); 5215 if (SCTP_BUF_NEXT(op_err) != NULL) { 5216 #ifdef SCTP_MBUF_LOGGING 5217 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5218 sctp_log_mbc(SCTP_BUF_NEXT(op_err), SCTP_MBUF_ICOPY); 5219 } 5220 #endif 5221 sctp_queue_op_err(stcb, op_err); 5222 } else { 5223 sctp_m_freem(op_err); 5224 } 5225 } 5226 } 5227 if ((ch->chunk_type & 0x80) == 0) { 5228 /* discard this packet */ 5229 *offset = length; 5230 return (stcb); 5231 } /* else skip this bad chunk and continue... */ 5232 break; 5233 } /* switch (ch->chunk_type) */ 5234 5235 next_chunk: 5236 /* get the next chunk */ 5237 *offset += SCTP_SIZE32(chk_length); 5238 if (*offset >= length) { 5239 /* no more data left in the mbuf chain */ 5240 break; 5241 } 5242 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 5243 sizeof(struct sctp_chunkhdr), chunk_buf); 5244 if (ch == NULL) { 5245 *offset = length; 5246 return (stcb); 5247 } 5248 } /* while */ 5249 5250 if ((asconf_cnt > 0) && (stcb != NULL)) { 5251 sctp_send_asconf_ack(stcb); 5252 } 5253 return (stcb); 5254 } 5255 5256 /* 5257 * common input chunk processing (v4 and v6) 5258 */ 5259 void 5260 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length, 5261 struct sockaddr *src, struct sockaddr *dst, 5262 struct sctphdr *sh, struct sctp_chunkhdr *ch, 5263 uint8_t compute_crc, 5264 uint8_t ecn_bits, 5265 uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum, 5266 uint32_t vrf_id, uint16_t port) 5267 { 5268 char msg[SCTP_DIAG_INFO_LEN]; 5269 struct mbuf *m = *mm, *op_err; 5270 struct sctp_inpcb *inp = NULL, *inp_decr = NULL; 5271 struct sctp_tcb *stcb = NULL; 5272 struct sctp_nets *net = NULL; 5273 uint32_t high_tsn; 5274 uint32_t cksum_in_hdr; 5275 int un_sent; 5276 int cnt_ctrl_ready = 0; 5277 int fwd_tsn_seen = 0, data_processed = 0; 5278 bool cksum_validated, stcb_looked_up; 5279 5280 SCTP_STAT_INCR(sctps_recvdatagrams); 5281 #ifdef SCTP_AUDITING_ENABLED 5282 sctp_audit_log(0xE0, 1); 5283 sctp_auditing(0, inp, stcb, net); 5284 #endif 5285 5286 stcb_looked_up = false; 5287 if (compute_crc != 0) { 5288 cksum_validated = false; 5289 cksum_in_hdr = sh->checksum; 5290 if (cksum_in_hdr != htonl(0)) { 5291 uint32_t cksum_calculated; 5292 5293 validate_cksum: 5294 sh->checksum = 0; 5295 cksum_calculated = sctp_calculate_cksum(m, iphlen); 5296 sh->checksum = cksum_in_hdr; 5297 if (cksum_calculated != cksum_in_hdr) { 5298 if (stcb_looked_up) { 5299 /* 5300 * The packet has a zero checksum, 5301 * which is not the correct CRC, no 5302 * stcb has been found or an stcb 5303 * has been found but an incorrect 5304 * zero checksum is not acceptable. 5305 */ 5306 KASSERT(cksum_in_hdr == htonl(0), 5307 ("cksum in header not zero: %x", 5308 ntohl(cksum_in_hdr))); 5309 if ((inp == NULL) && 5310 (SCTP_BASE_SYSCTL(sctp_ootb_with_zero_cksum) == 1)) { 5311 /* 5312 * This is an OOTB packet, 5313 * depending on the sysctl 5314 * variable, pretend that 5315 * the checksum is 5316 * acceptable, to allow an 5317 * appropriate response 5318 * (ABORT, for examlpe) to 5319 * be sent. 5320 */ 5321 KASSERT(stcb == NULL, 5322 ("stcb is %p", stcb)); 5323 SCTP_STAT_INCR(sctps_recvzerocrc); 5324 goto cksum_validated; 5325 } 5326 } else { 5327 stcb = sctp_findassociation_addr(m, offset, src, dst, 5328 sh, ch, &inp, &net, vrf_id); 5329 } 5330 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad cksum in SCTP packet:%x calculated:%x m:%p mlen:%d iphlen:%d\n", 5331 ntohl(cksum_in_hdr), ntohl(cksum_calculated), (void *)m, length, iphlen); 5332 #if defined(INET) || defined(INET6) 5333 if ((ch->chunk_type != SCTP_INITIATION) && 5334 (net != NULL) && (net->port != port)) { 5335 if (net->port == 0) { 5336 /* 5337 * UDP encapsulation turned 5338 * on. 5339 */ 5340 net->mtu -= sizeof(struct udphdr); 5341 if (stcb->asoc.smallest_mtu > net->mtu) { 5342 sctp_pathmtu_adjustment(stcb, net->mtu, true); 5343 } 5344 } else if (port == 0) { 5345 /* 5346 * UDP encapsulation turned 5347 * off. 5348 */ 5349 net->mtu += sizeof(struct udphdr); 5350 /* XXX Update smallest_mtu */ 5351 } 5352 net->port = port; 5353 } 5354 #endif 5355 if (net != NULL) { 5356 net->flowtype = mflowtype; 5357 net->flowid = mflowid; 5358 } 5359 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5360 if ((inp != NULL) && (stcb != NULL)) { 5361 if (stcb->asoc.pktdrop_supported) { 5362 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1); 5363 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED); 5364 } 5365 } else if ((inp != NULL) && (stcb == NULL)) { 5366 inp_decr = inp; 5367 } 5368 SCTP_STAT_INCR(sctps_badsum); 5369 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors); 5370 goto out; 5371 } else { 5372 cksum_validated = true; 5373 } 5374 } 5375 KASSERT(cksum_validated || cksum_in_hdr == htonl(0), 5376 ("cksum 0x%08x not zero and not validated", ntohl(cksum_in_hdr))); 5377 if (!cksum_validated) { 5378 stcb = sctp_findassociation_addr(m, offset, src, dst, 5379 sh, ch, &inp, &net, vrf_id); 5380 stcb_looked_up = true; 5381 if (stcb == NULL) { 5382 goto validate_cksum; 5383 } 5384 if (stcb->asoc.rcv_edmid == SCTP_EDMID_NONE) { 5385 goto validate_cksum; 5386 } 5387 KASSERT(stcb->asoc.rcv_edmid == SCTP_EDMID_LOWER_LAYER_DTLS, 5388 ("Unexpected EDMID %u", stcb->asoc.rcv_edmid)); 5389 SCTP_STAT_INCR(sctps_recvzerocrc); 5390 } 5391 } 5392 cksum_validated: 5393 /* Destination port of 0 is illegal, based on RFC4960. */ 5394 if (sh->dest_port == htons(0)) { 5395 SCTP_STAT_INCR(sctps_hdrops); 5396 if ((stcb == NULL) && (inp != NULL)) { 5397 inp_decr = inp; 5398 } 5399 goto out; 5400 } 5401 if (!stcb_looked_up) { 5402 stcb = sctp_findassociation_addr(m, offset, src, dst, 5403 sh, ch, &inp, &net, vrf_id); 5404 } 5405 #if defined(INET) || defined(INET6) 5406 if ((ch->chunk_type != SCTP_INITIATION) && 5407 (net != NULL) && (net->port != port)) { 5408 if (net->port == 0) { 5409 /* UDP encapsulation turned on. */ 5410 net->mtu -= sizeof(struct udphdr); 5411 if (stcb->asoc.smallest_mtu > net->mtu) { 5412 sctp_pathmtu_adjustment(stcb, net->mtu, true); 5413 } 5414 } else if (port == 0) { 5415 /* UDP encapsulation turned off. */ 5416 net->mtu += sizeof(struct udphdr); 5417 /* XXX Update smallest_mtu */ 5418 } 5419 net->port = port; 5420 } 5421 #endif 5422 if (net != NULL) { 5423 net->flowtype = mflowtype; 5424 net->flowid = mflowid; 5425 } 5426 if (inp == NULL) { 5427 SCTP_STAT_INCR(sctps_noport); 5428 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5429 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) { 5430 goto out; 5431 } 5432 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 5433 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks); 5434 sctp_send_shutdown_complete2(src, dst, sh, 5435 mflowtype, mflowid, fibnum, 5436 vrf_id, port); 5437 goto out; 5438 } 5439 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) { 5440 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks); 5441 goto out; 5442 } 5443 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) { 5444 if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) || 5445 ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) && 5446 (ch->chunk_type != SCTP_INIT))) { 5447 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5448 "Out of the blue"); 5449 sctp_send_abort(m, iphlen, src, dst, 5450 sh, 0, op_err, 5451 mflowtype, mflowid, fibnum, 5452 vrf_id, port); 5453 } 5454 } 5455 goto out; 5456 } else if (stcb == NULL) { 5457 inp_decr = inp; 5458 } 5459 SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n", 5460 (void *)m, iphlen, offset, length, (void *)stcb); 5461 if (stcb) { 5462 /* always clear this before beginning a packet */ 5463 stcb->asoc.authenticated = 0; 5464 stcb->asoc.seen_a_sack_this_pkt = 0; 5465 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n", 5466 (void *)stcb, stcb->asoc.state); 5467 5468 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) || 5469 (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) { 5470 /*- 5471 * If we hit here, we had a ref count 5472 * up when the assoc was aborted and the 5473 * timer is clearing out the assoc, we should 5474 * NOT respond to any packet.. its OOTB. 5475 */ 5476 SCTP_TCB_UNLOCK(stcb); 5477 stcb = NULL; 5478 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5479 SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5480 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5481 msg); 5482 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5483 mflowtype, mflowid, inp->fibnum, 5484 vrf_id, port); 5485 goto out; 5486 } 5487 } 5488 if (IS_SCTP_CONTROL(ch)) { 5489 /* process the control portion of the SCTP packet */ 5490 /* sa_ignore NO_NULL_CHK */ 5491 stcb = sctp_process_control(m, iphlen, &offset, length, 5492 src, dst, sh, ch, 5493 inp, stcb, &net, &fwd_tsn_seen, 5494 mflowtype, mflowid, fibnum, 5495 vrf_id, port); 5496 if (stcb) { 5497 /* 5498 * This covers us if the cookie-echo was there and 5499 * it changes our INP. 5500 */ 5501 inp = stcb->sctp_ep; 5502 #if defined(INET) || defined(INET6) 5503 if ((ch->chunk_type != SCTP_INITIATION) && 5504 (net != NULL) && (net->port != port)) { 5505 if (net->port == 0) { 5506 /* UDP encapsulation turned on. */ 5507 net->mtu -= sizeof(struct udphdr); 5508 if (stcb->asoc.smallest_mtu > net->mtu) { 5509 sctp_pathmtu_adjustment(stcb, net->mtu, true); 5510 } 5511 } else if (port == 0) { 5512 /* UDP encapsulation turned off. */ 5513 net->mtu += sizeof(struct udphdr); 5514 /* XXX Update smallest_mtu */ 5515 } 5516 net->port = port; 5517 } 5518 #endif 5519 } 5520 } else { 5521 /* 5522 * no control chunks, so pre-process DATA chunks (these 5523 * checks are taken care of by control processing) 5524 */ 5525 5526 /* 5527 * if DATA only packet, and auth is required, then punt... 5528 * can't have authenticated without any AUTH (control) 5529 * chunks 5530 */ 5531 if ((stcb != NULL) && 5532 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) { 5533 /* "silently" ignore */ 5534 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5535 SCTP_STAT_INCR(sctps_recvauthmissing); 5536 goto out; 5537 } 5538 if (stcb == NULL) { 5539 /* out of the blue DATA chunk */ 5540 SCTP_PROBE5(receive, NULL, NULL, m, NULL, sh); 5541 SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5542 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5543 msg); 5544 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5545 mflowtype, mflowid, fibnum, 5546 vrf_id, port); 5547 goto out; 5548 } 5549 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) { 5550 /* v_tag mismatch! */ 5551 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5552 SCTP_STAT_INCR(sctps_badvtag); 5553 goto out; 5554 } 5555 } 5556 5557 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5558 if (stcb == NULL) { 5559 /* 5560 * no valid TCB for this packet, or we found it's a bad 5561 * packet while processing control, or we're done with this 5562 * packet (done or skip rest of data), so we drop it... 5563 */ 5564 goto out; 5565 } 5566 5567 /* 5568 * DATA chunk processing 5569 */ 5570 /* plow through the data chunks while length > offset */ 5571 5572 /* 5573 * Rest should be DATA only. Check authentication state if AUTH for 5574 * DATA is required. 5575 */ 5576 if ((length > offset) && 5577 (stcb != NULL) && 5578 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) && 5579 !stcb->asoc.authenticated) { 5580 /* "silently" ignore */ 5581 SCTP_STAT_INCR(sctps_recvauthmissing); 5582 SCTPDBG(SCTP_DEBUG_AUTH1, 5583 "Data chunk requires AUTH, skipped\n"); 5584 goto trigger_send; 5585 } 5586 if (length > offset) { 5587 int retval; 5588 5589 /* 5590 * First check to make sure our state is correct. We would 5591 * not get here unless we really did have a tag, so we don't 5592 * abort if this happens, just dump the chunk silently. 5593 */ 5594 switch (SCTP_GET_STATE(stcb)) { 5595 case SCTP_STATE_COOKIE_ECHOED: 5596 /* 5597 * we consider data with valid tags in this state 5598 * shows us the cookie-ack was lost. Imply it was 5599 * there. 5600 */ 5601 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net); 5602 break; 5603 case SCTP_STATE_COOKIE_WAIT: 5604 /* 5605 * We consider OOTB any data sent during asoc setup. 5606 */ 5607 SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5608 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5609 msg); 5610 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5611 mflowtype, mflowid, inp->fibnum, 5612 vrf_id, port); 5613 goto out; 5614 /* sa_ignore NOTREACHED */ 5615 break; 5616 case SCTP_STATE_EMPTY: /* should not happen */ 5617 case SCTP_STATE_INUSE: /* should not happen */ 5618 case SCTP_STATE_SHUTDOWN_RECEIVED: /* This is a peer error */ 5619 case SCTP_STATE_SHUTDOWN_ACK_SENT: 5620 default: 5621 goto out; 5622 /* sa_ignore NOTREACHED */ 5623 break; 5624 case SCTP_STATE_OPEN: 5625 case SCTP_STATE_SHUTDOWN_SENT: 5626 break; 5627 } 5628 /* plow through the data chunks while length > offset */ 5629 retval = sctp_process_data(mm, iphlen, &offset, length, 5630 inp, stcb, net, &high_tsn); 5631 if (retval == 2) { 5632 /* 5633 * The association aborted, NO UNLOCK needed since 5634 * the association is destroyed. 5635 */ 5636 stcb = NULL; 5637 goto out; 5638 } 5639 if (retval == 0) { 5640 data_processed = 1; 5641 } 5642 /* 5643 * Anything important needs to have been m_copy'ed in 5644 * process_data 5645 */ 5646 } 5647 5648 /* take care of ecn */ 5649 if ((data_processed == 1) && 5650 (stcb->asoc.ecn_supported == 1) && 5651 ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) { 5652 /* Yep, we need to add a ECNE */ 5653 sctp_send_ecn_echo(stcb, net, high_tsn); 5654 } 5655 5656 if ((data_processed == 0) && (fwd_tsn_seen)) { 5657 int was_a_gap; 5658 uint32_t highest_tsn; 5659 5660 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) { 5661 highest_tsn = stcb->asoc.highest_tsn_inside_nr_map; 5662 } else { 5663 highest_tsn = stcb->asoc.highest_tsn_inside_map; 5664 } 5665 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn); 5666 stcb->asoc.send_sack = 1; 5667 sctp_sack_check(stcb, was_a_gap); 5668 } else if (fwd_tsn_seen) { 5669 stcb->asoc.send_sack = 1; 5670 } 5671 /* trigger send of any chunks in queue... */ 5672 trigger_send: 5673 #ifdef SCTP_AUDITING_ENABLED 5674 sctp_audit_log(0xE0, 2); 5675 sctp_auditing(1, inp, stcb, net); 5676 #endif 5677 SCTPDBG(SCTP_DEBUG_INPUT1, 5678 "Check for chunk output prw:%d tqe:%d tf=%d\n", 5679 stcb->asoc.peers_rwnd, 5680 TAILQ_EMPTY(&stcb->asoc.control_send_queue), 5681 stcb->asoc.total_flight); 5682 un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight); 5683 if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 5684 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq; 5685 } 5686 if (!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue) || 5687 cnt_ctrl_ready || 5688 stcb->asoc.trigger_reset || 5689 ((un_sent > 0) && 5690 (stcb->asoc.peers_rwnd > 0 || stcb->asoc.total_flight == 0))) { 5691 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n"); 5692 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 5693 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n"); 5694 } 5695 #ifdef SCTP_AUDITING_ENABLED 5696 sctp_audit_log(0xE0, 3); 5697 sctp_auditing(2, inp, stcb, net); 5698 #endif 5699 out: 5700 if (stcb != NULL) { 5701 SCTP_TCB_UNLOCK(stcb); 5702 } 5703 if (inp_decr != NULL) { 5704 /* reduce ref-count */ 5705 SCTP_INP_WLOCK(inp_decr); 5706 SCTP_INP_DECR_REF(inp_decr); 5707 SCTP_INP_WUNLOCK(inp_decr); 5708 } 5709 return; 5710 } 5711 5712 #ifdef INET 5713 void 5714 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port) 5715 { 5716 struct mbuf *m; 5717 int iphlen; 5718 uint32_t vrf_id = 0; 5719 uint8_t ecn_bits; 5720 struct sockaddr_in src, dst; 5721 struct ip *ip; 5722 struct sctphdr *sh; 5723 struct sctp_chunkhdr *ch; 5724 int length, offset; 5725 uint8_t compute_crc; 5726 uint32_t mflowid; 5727 uint8_t mflowtype; 5728 uint16_t fibnum; 5729 5730 iphlen = off; 5731 if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) { 5732 SCTP_RELEASE_PKT(i_pak); 5733 return; 5734 } 5735 m = SCTP_HEADER_TO_CHAIN(i_pak); 5736 #ifdef SCTP_MBUF_LOGGING 5737 /* Log in any input mbufs */ 5738 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5739 sctp_log_mbc(m, SCTP_MBUF_INPUT); 5740 } 5741 #endif 5742 #ifdef SCTP_PACKET_LOGGING 5743 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) { 5744 sctp_packet_log(m); 5745 } 5746 #endif 5747 SCTPDBG(SCTP_DEBUG_CRCOFFLOAD, 5748 "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n", 5749 m->m_pkthdr.len, 5750 if_name(m->m_pkthdr.rcvif), 5751 (int)m->m_pkthdr.csum_flags, CSUM_BITS); 5752 mflowid = m->m_pkthdr.flowid; 5753 mflowtype = M_HASHTYPE_GET(m); 5754 fibnum = M_GETFIB(m); 5755 SCTP_STAT_INCR(sctps_recvpackets); 5756 SCTP_STAT_INCR_COUNTER64(sctps_inpackets); 5757 /* Get IP, SCTP, and first chunk header together in the first mbuf. */ 5758 offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr); 5759 if (SCTP_BUF_LEN(m) < offset) { 5760 if ((m = m_pullup(m, offset)) == NULL) { 5761 SCTP_STAT_INCR(sctps_hdrops); 5762 return; 5763 } 5764 } 5765 ip = mtod(m, struct ip *); 5766 sh = (struct sctphdr *)((caddr_t)ip + iphlen); 5767 ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr)); 5768 offset -= sizeof(struct sctp_chunkhdr); 5769 memset(&src, 0, sizeof(struct sockaddr_in)); 5770 src.sin_family = AF_INET; 5771 src.sin_len = sizeof(struct sockaddr_in); 5772 src.sin_port = sh->src_port; 5773 src.sin_addr = ip->ip_src; 5774 memset(&dst, 0, sizeof(struct sockaddr_in)); 5775 dst.sin_family = AF_INET; 5776 dst.sin_len = sizeof(struct sockaddr_in); 5777 dst.sin_port = sh->dest_port; 5778 dst.sin_addr = ip->ip_dst; 5779 length = ntohs(ip->ip_len); 5780 /* Validate mbuf chain length with IP payload length. */ 5781 if (SCTP_HEADER_LEN(m) != length) { 5782 SCTPDBG(SCTP_DEBUG_INPUT1, 5783 "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m)); 5784 SCTP_STAT_INCR(sctps_hdrops); 5785 goto out; 5786 } 5787 /* SCTP does not allow broadcasts or multicasts */ 5788 if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) { 5789 goto out; 5790 } 5791 if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) { 5792 goto out; 5793 } 5794 ecn_bits = ip->ip_tos; 5795 if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) { 5796 SCTP_STAT_INCR(sctps_recvhwcrc); 5797 compute_crc = 0; 5798 } else { 5799 SCTP_STAT_INCR(sctps_recvswcrc); 5800 compute_crc = 1; 5801 } 5802 sctp_common_input_processing(&m, iphlen, offset, length, 5803 (struct sockaddr *)&src, 5804 (struct sockaddr *)&dst, 5805 sh, ch, 5806 compute_crc, 5807 ecn_bits, 5808 mflowtype, mflowid, fibnum, 5809 vrf_id, port); 5810 out: 5811 if (m) { 5812 sctp_m_freem(m); 5813 } 5814 return; 5815 } 5816 5817 #if defined(SCTP_MCORE_INPUT) && defined(SMP) 5818 extern int *sctp_cpuarry; 5819 #endif 5820 5821 int 5822 sctp_input(struct mbuf **mp, int *offp, int proto SCTP_UNUSED) 5823 { 5824 struct mbuf *m; 5825 int off; 5826 5827 m = *mp; 5828 off = *offp; 5829 #if defined(SCTP_MCORE_INPUT) && defined(SMP) 5830 if (mp_ncpus > 1) { 5831 struct ip *ip; 5832 struct sctphdr *sh; 5833 int offset; 5834 int cpu_to_use; 5835 uint32_t flowid, tag; 5836 5837 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) { 5838 flowid = m->m_pkthdr.flowid; 5839 } else { 5840 /* 5841 * No flow id built by lower layers fix it so we 5842 * create one. 5843 */ 5844 offset = off + sizeof(struct sctphdr); 5845 if (SCTP_BUF_LEN(m) < offset) { 5846 if ((m = m_pullup(m, offset)) == NULL) { 5847 SCTP_STAT_INCR(sctps_hdrops); 5848 return (IPPROTO_DONE); 5849 } 5850 } 5851 ip = mtod(m, struct ip *); 5852 sh = (struct sctphdr *)((caddr_t)ip + off); 5853 tag = htonl(sh->v_tag); 5854 flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port); 5855 m->m_pkthdr.flowid = flowid; 5856 M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE_HASH); 5857 } 5858 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus]; 5859 sctp_queue_to_mcore(m, off, cpu_to_use); 5860 return (IPPROTO_DONE); 5861 } 5862 #endif 5863 sctp_input_with_port(m, off, 0); 5864 return (IPPROTO_DONE); 5865 } 5866 #endif 5867