1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved. 5 * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved. 6 * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions are met: 10 * 11 * a) Redistributions of source code must retain the above copyright notice, 12 * this list of conditions and the following disclaimer. 13 * 14 * b) Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in 16 * the documentation and/or other materials provided with the distribution. 17 * 18 * c) Neither the name of Cisco Systems, Inc. nor the names of its 19 * contributors may be used to endorse or promote products derived 20 * from this software without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 23 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 24 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 26 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 28 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 29 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 30 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 31 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 32 * THE POSSIBILITY OF SUCH DAMAGE. 33 */ 34 35 #include <sys/cdefs.h> 36 __FBSDID("$FreeBSD$"); 37 38 #include <netinet/sctp_os.h> 39 #include <netinet/sctp_var.h> 40 #include <netinet/sctp_sysctl.h> 41 #include <netinet/sctp_pcb.h> 42 #include <netinet/sctp_header.h> 43 #include <netinet/sctputil.h> 44 #include <netinet/sctp_output.h> 45 #include <netinet/sctp_input.h> 46 #include <netinet/sctp_auth.h> 47 #include <netinet/sctp_indata.h> 48 #include <netinet/sctp_asconf.h> 49 #include <netinet/sctp_bsd_addr.h> 50 #include <netinet/sctp_timer.h> 51 #include <netinet/sctp_crc32.h> 52 #include <netinet/sctp_kdtrace.h> 53 #if defined(INET) || defined(INET6) 54 #include <netinet/udp.h> 55 #endif 56 #include <sys/smp.h> 57 58 static void 59 sctp_stop_all_cookie_timers(struct sctp_tcb *stcb) 60 { 61 struct sctp_nets *net; 62 63 /* 64 * This now not only stops all cookie timers it also stops any INIT 65 * timers as well. This will make sure that the timers are stopped 66 * in all collision cases. 67 */ 68 SCTP_TCB_LOCK_ASSERT(stcb); 69 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 70 if (net->rxt_timer.type == SCTP_TIMER_TYPE_COOKIE) { 71 sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE, 72 stcb->sctp_ep, 73 stcb, 74 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_1); 75 } else if (net->rxt_timer.type == SCTP_TIMER_TYPE_INIT) { 76 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, 77 stcb->sctp_ep, 78 stcb, 79 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_2); 80 } 81 } 82 } 83 84 /* INIT handler */ 85 static void 86 sctp_handle_init(struct mbuf *m, int iphlen, int offset, 87 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 88 struct sctp_init_chunk *cp, struct sctp_inpcb *inp, 89 struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_no_unlock, 90 uint8_t mflowtype, uint32_t mflowid, 91 uint32_t vrf_id, uint16_t port) 92 { 93 struct sctp_init *init; 94 struct mbuf *op_err; 95 96 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_init: handling INIT tcb:%p\n", 97 (void *)stcb); 98 if (stcb == NULL) { 99 SCTP_INP_RLOCK(inp); 100 } 101 /* validate length */ 102 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_chunk)) { 103 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 104 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 105 mflowtype, mflowid, 106 vrf_id, port); 107 if (stcb) 108 *abort_no_unlock = 1; 109 goto outnow; 110 } 111 /* validate parameters */ 112 init = &cp->init; 113 if (init->initiate_tag == 0) { 114 /* protocol error... send abort */ 115 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 116 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 117 mflowtype, mflowid, 118 vrf_id, port); 119 if (stcb) 120 *abort_no_unlock = 1; 121 goto outnow; 122 } 123 if (ntohl(init->a_rwnd) < SCTP_MIN_RWND) { 124 /* invalid parameter... send abort */ 125 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 126 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 127 mflowtype, mflowid, 128 vrf_id, port); 129 if (stcb) 130 *abort_no_unlock = 1; 131 goto outnow; 132 } 133 if (init->num_inbound_streams == 0) { 134 /* protocol error... send abort */ 135 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 136 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 137 mflowtype, mflowid, 138 vrf_id, port); 139 if (stcb) 140 *abort_no_unlock = 1; 141 goto outnow; 142 } 143 if (init->num_outbound_streams == 0) { 144 /* protocol error... send abort */ 145 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 146 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 147 mflowtype, mflowid, 148 vrf_id, port); 149 if (stcb) 150 *abort_no_unlock = 1; 151 goto outnow; 152 } 153 if (sctp_validate_init_auth_params(m, offset + sizeof(*cp), 154 offset + ntohs(cp->ch.chunk_length))) { 155 /* auth parameter(s) error... send abort */ 156 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 157 "Problem with AUTH parameters"); 158 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 159 mflowtype, mflowid, 160 vrf_id, port); 161 if (stcb) 162 *abort_no_unlock = 1; 163 goto outnow; 164 } 165 /* We are only accepting if we have a listening socket. */ 166 if ((stcb == NULL) && 167 ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 168 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) || 169 (!SCTP_IS_LISTENING(inp)))) { 170 /* 171 * FIX ME ?? What about TCP model and we have a 172 * match/restart case? Actually no fix is needed. the lookup 173 * will always find the existing assoc so stcb would not be 174 * NULL. It may be questionable to do this since we COULD 175 * just send back the INIT-ACK and hope that the app did 176 * accept()'s by the time the COOKIE was sent. But there is 177 * a price to pay for COOKIE generation and I don't want to 178 * pay it on the chance that the app will actually do some 179 * accepts(). The App just looses and should NOT be in this 180 * state :-) 181 */ 182 if (SCTP_BASE_SYSCTL(sctp_blackhole) == 0) { 183 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 184 "No listener"); 185 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err, 186 mflowtype, mflowid, inp->fibnum, 187 vrf_id, port); 188 } 189 goto outnow; 190 } 191 if ((stcb != NULL) && 192 (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT)) { 193 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending SHUTDOWN-ACK\n"); 194 sctp_send_shutdown_ack(stcb, NULL); 195 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 196 } else { 197 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n"); 198 sctp_send_initiate_ack(inp, stcb, net, m, iphlen, offset, 199 src, dst, sh, cp, 200 mflowtype, mflowid, 201 vrf_id, port); 202 } 203 outnow: 204 if (stcb == NULL) { 205 SCTP_INP_RUNLOCK(inp); 206 } 207 } 208 209 /* 210 * process peer "INIT/INIT-ACK" chunk returns value < 0 on error 211 */ 212 213 int 214 sctp_is_there_unsent_data(struct sctp_tcb *stcb, int so_locked) 215 { 216 int unsent_data; 217 unsigned int i; 218 struct sctp_stream_queue_pending *sp; 219 struct sctp_association *asoc; 220 221 /* 222 * This function returns if any stream has true unsent data on it. 223 * Note that as it looks through it will clean up any places that 224 * have old data that has been sent but left at top of stream queue. 225 */ 226 asoc = &stcb->asoc; 227 unsent_data = 0; 228 SCTP_TCB_SEND_LOCK(stcb); 229 if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 230 /* Check to see if some data queued */ 231 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 232 /* sa_ignore FREED_MEMORY */ 233 sp = TAILQ_FIRST(&stcb->asoc.strmout[i].outqueue); 234 if (sp == NULL) { 235 continue; 236 } 237 if ((sp->msg_is_complete) && 238 (sp->length == 0) && 239 (sp->sender_all_done)) { 240 /* 241 * We are doing differed cleanup. Last time 242 * through when we took all the data the 243 * sender_all_done was not set. 244 */ 245 if (sp->put_last_out == 0) { 246 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n"); 247 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n", 248 sp->sender_all_done, 249 sp->length, 250 sp->msg_is_complete, 251 sp->put_last_out); 252 } 253 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1); 254 TAILQ_REMOVE(&stcb->asoc.strmout[i].outqueue, sp, next); 255 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, &asoc->strmout[i], sp, 1); 256 if (sp->net) { 257 sctp_free_remote_addr(sp->net); 258 sp->net = NULL; 259 } 260 if (sp->data) { 261 sctp_m_freem(sp->data); 262 sp->data = NULL; 263 } 264 sctp_free_a_strmoq(stcb, sp, so_locked); 265 if (!TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) { 266 unsent_data++; 267 } 268 } else { 269 unsent_data++; 270 } 271 if (unsent_data > 0) { 272 break; 273 } 274 } 275 } 276 SCTP_TCB_SEND_UNLOCK(stcb); 277 return (unsent_data); 278 } 279 280 static int 281 sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb) 282 { 283 struct sctp_init *init; 284 struct sctp_association *asoc; 285 struct sctp_nets *lnet; 286 unsigned int i; 287 288 init = &cp->init; 289 asoc = &stcb->asoc; 290 /* save off parameters */ 291 asoc->peer_vtag = ntohl(init->initiate_tag); 292 asoc->peers_rwnd = ntohl(init->a_rwnd); 293 /* init tsn's */ 294 asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1; 295 296 if (!TAILQ_EMPTY(&asoc->nets)) { 297 /* update any ssthresh's that may have a default */ 298 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) { 299 lnet->ssthresh = asoc->peers_rwnd; 300 if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) { 301 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION); 302 } 303 } 304 } 305 SCTP_TCB_SEND_LOCK(stcb); 306 if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) { 307 unsigned int newcnt; 308 struct sctp_stream_out *outs; 309 struct sctp_stream_queue_pending *sp, *nsp; 310 struct sctp_tmit_chunk *chk, *nchk; 311 312 /* abandon the upper streams */ 313 newcnt = ntohs(init->num_inbound_streams); 314 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) { 315 if (chk->rec.data.sid >= newcnt) { 316 TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next); 317 asoc->send_queue_cnt--; 318 if (asoc->strmout[chk->rec.data.sid].chunks_on_queues > 0) { 319 asoc->strmout[chk->rec.data.sid].chunks_on_queues--; 320 #ifdef INVARIANTS 321 } else { 322 panic("No chunks on the queues for sid %u.", chk->rec.data.sid); 323 #endif 324 } 325 if (chk->data != NULL) { 326 sctp_free_bufspace(stcb, asoc, chk, 1); 327 sctp_ulp_notify(SCTP_NOTIFY_UNSENT_DG_FAIL, stcb, 328 0, chk, SCTP_SO_NOT_LOCKED); 329 if (chk->data) { 330 sctp_m_freem(chk->data); 331 chk->data = NULL; 332 } 333 } 334 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 335 /* sa_ignore FREED_MEMORY */ 336 } 337 } 338 if (asoc->strmout) { 339 for (i = newcnt; i < asoc->pre_open_streams; i++) { 340 outs = &asoc->strmout[i]; 341 TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) { 342 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1); 343 TAILQ_REMOVE(&outs->outqueue, sp, next); 344 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, outs, sp, 1); 345 sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL, 346 stcb, 0, sp, SCTP_SO_NOT_LOCKED); 347 if (sp->data) { 348 sctp_m_freem(sp->data); 349 sp->data = NULL; 350 } 351 if (sp->net) { 352 sctp_free_remote_addr(sp->net); 353 sp->net = NULL; 354 } 355 /* Free the chunk */ 356 sctp_free_a_strmoq(stcb, sp, SCTP_SO_NOT_LOCKED); 357 /* sa_ignore FREED_MEMORY */ 358 } 359 outs->state = SCTP_STREAM_CLOSED; 360 } 361 } 362 /* cut back the count */ 363 asoc->pre_open_streams = newcnt; 364 } 365 SCTP_TCB_SEND_UNLOCK(stcb); 366 asoc->streamoutcnt = asoc->pre_open_streams; 367 if (asoc->strmout) { 368 for (i = 0; i < asoc->streamoutcnt; i++) { 369 asoc->strmout[i].state = SCTP_STREAM_OPEN; 370 } 371 } 372 /* EY - nr_sack: initialize highest tsn in nr_mapping_array */ 373 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 374 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 375 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 376 } 377 /* This is the next one we expect */ 378 asoc->str_reset_seq_in = asoc->asconf_seq_in + 1; 379 380 asoc->mapping_array_base_tsn = ntohl(init->initial_tsn); 381 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in; 382 383 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 384 /* open the requested streams */ 385 386 if (asoc->strmin != NULL) { 387 /* Free the old ones */ 388 for (i = 0; i < asoc->streamincnt; i++) { 389 sctp_clean_up_stream(stcb, &asoc->strmin[i].inqueue); 390 sctp_clean_up_stream(stcb, &asoc->strmin[i].uno_inqueue); 391 } 392 SCTP_FREE(asoc->strmin, SCTP_M_STRMI); 393 } 394 if (asoc->max_inbound_streams > ntohs(init->num_outbound_streams)) { 395 asoc->streamincnt = ntohs(init->num_outbound_streams); 396 } else { 397 asoc->streamincnt = asoc->max_inbound_streams; 398 } 399 SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt * 400 sizeof(struct sctp_stream_in), SCTP_M_STRMI); 401 if (asoc->strmin == NULL) { 402 /* we didn't get memory for the streams! */ 403 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n"); 404 return (-1); 405 } 406 for (i = 0; i < asoc->streamincnt; i++) { 407 asoc->strmin[i].sid = i; 408 asoc->strmin[i].last_mid_delivered = 0xffffffff; 409 TAILQ_INIT(&asoc->strmin[i].inqueue); 410 TAILQ_INIT(&asoc->strmin[i].uno_inqueue); 411 asoc->strmin[i].pd_api_started = 0; 412 asoc->strmin[i].delivery_started = 0; 413 } 414 /* 415 * load_address_from_init will put the addresses into the 416 * association when the COOKIE is processed or the INIT-ACK is 417 * processed. Both types of COOKIE's existing and new call this 418 * routine. It will remove addresses that are no longer in the 419 * association (for the restarting case where addresses are 420 * removed). Up front when the INIT arrives we will discard it if it 421 * is a restart and new addresses have been added. 422 */ 423 /* sa_ignore MEMLEAK */ 424 return (0); 425 } 426 427 /* 428 * INIT-ACK message processing/consumption returns value < 0 on error 429 */ 430 static int 431 sctp_process_init_ack(struct mbuf *m, int iphlen, int offset, 432 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 433 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 434 struct sctp_nets *net, int *abort_no_unlock, 435 uint8_t mflowtype, uint32_t mflowid, 436 uint32_t vrf_id) 437 { 438 struct sctp_association *asoc; 439 struct mbuf *op_err; 440 int retval, abort_flag, cookie_found; 441 int initack_limit; 442 int nat_friendly = 0; 443 444 /* First verify that we have no illegal param's */ 445 abort_flag = 0; 446 cookie_found = 0; 447 448 op_err = sctp_arethere_unrecognized_parameters(m, 449 (offset + sizeof(struct sctp_init_chunk)), 450 &abort_flag, (struct sctp_chunkhdr *)cp, 451 &nat_friendly, &cookie_found); 452 if (abort_flag) { 453 /* Send an abort and notify peer */ 454 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 455 *abort_no_unlock = 1; 456 return (-1); 457 } 458 if (!cookie_found) { 459 uint16_t len; 460 461 /* Only report the missing cookie parameter */ 462 if (op_err != NULL) { 463 sctp_m_freem(op_err); 464 } 465 len = (uint16_t)(sizeof(struct sctp_error_missing_param) + sizeof(uint16_t)); 466 /* We abort with an error of missing mandatory param */ 467 op_err = sctp_get_mbuf_for_msg(len, 0, M_NOWAIT, 1, MT_DATA); 468 if (op_err != NULL) { 469 struct sctp_error_missing_param *cause; 470 471 SCTP_BUF_LEN(op_err) = len; 472 cause = mtod(op_err, struct sctp_error_missing_param *); 473 /* Subtract the reserved param */ 474 cause->cause.code = htons(SCTP_CAUSE_MISSING_PARAM); 475 cause->cause.length = htons(len); 476 cause->num_missing_params = htonl(1); 477 cause->type[0] = htons(SCTP_STATE_COOKIE); 478 } 479 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 480 src, dst, sh, op_err, 481 mflowtype, mflowid, 482 vrf_id, net->port); 483 *abort_no_unlock = 1; 484 return (-3); 485 } 486 asoc = &stcb->asoc; 487 asoc->peer_supports_nat = (uint8_t)nat_friendly; 488 /* process the peer's parameters in the INIT-ACK */ 489 retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb); 490 if (retval < 0) { 491 if (op_err != NULL) { 492 sctp_m_freem(op_err); 493 } 494 return (retval); 495 } 496 initack_limit = offset + ntohs(cp->ch.chunk_length); 497 /* load all addresses */ 498 if ((retval = sctp_load_addresses_from_init(stcb, m, 499 (offset + sizeof(struct sctp_init_chunk)), initack_limit, 500 src, dst, NULL, stcb->asoc.port))) { 501 if (op_err != NULL) { 502 sctp_m_freem(op_err); 503 } 504 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 505 "Problem with address parameters"); 506 SCTPDBG(SCTP_DEBUG_INPUT1, 507 "Load addresses from INIT causes an abort %d\n", 508 retval); 509 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 510 src, dst, sh, op_err, 511 mflowtype, mflowid, 512 vrf_id, net->port); 513 *abort_no_unlock = 1; 514 return (-1); 515 } 516 /* if the peer doesn't support asconf, flush the asconf queue */ 517 if (asoc->asconf_supported == 0) { 518 struct sctp_asconf_addr *param, *nparam; 519 520 TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) { 521 TAILQ_REMOVE(&asoc->asconf_queue, param, next); 522 SCTP_FREE(param, SCTP_M_ASC_ADDR); 523 } 524 } 525 526 stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs, 527 stcb->asoc.local_hmacs); 528 if (op_err) { 529 sctp_queue_op_err(stcb, op_err); 530 /* queuing will steal away the mbuf chain to the out queue */ 531 op_err = NULL; 532 } 533 /* extract the cookie and queue it to "echo" it back... */ 534 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 535 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 536 stcb->asoc.overall_error_count, 537 0, 538 SCTP_FROM_SCTP_INPUT, 539 __LINE__); 540 } 541 stcb->asoc.overall_error_count = 0; 542 net->error_count = 0; 543 544 /* 545 * Cancel the INIT timer, We do this first before queueing the 546 * cookie. We always cancel at the primary to assue that we are 547 * canceling the timer started by the INIT which always goes to the 548 * primary. 549 */ 550 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb, 551 asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3); 552 553 /* calculate the RTO */ 554 sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, 555 SCTP_RTT_FROM_NON_DATA); 556 retval = sctp_send_cookie_echo(m, offset, initack_limit, stcb, net); 557 return (retval); 558 } 559 560 static void 561 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp, 562 struct sctp_tcb *stcb, struct sctp_nets *net) 563 { 564 union sctp_sockstore store; 565 struct sctp_nets *r_net, *f_net; 566 struct timeval tv; 567 int req_prim = 0; 568 uint16_t old_error_counter; 569 570 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) { 571 /* Invalid length */ 572 return; 573 } 574 575 memset(&store, 0, sizeof(store)); 576 switch (cp->heartbeat.hb_info.addr_family) { 577 #ifdef INET 578 case AF_INET: 579 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) { 580 store.sin.sin_family = cp->heartbeat.hb_info.addr_family; 581 store.sin.sin_len = cp->heartbeat.hb_info.addr_len; 582 store.sin.sin_port = stcb->rport; 583 memcpy(&store.sin.sin_addr, cp->heartbeat.hb_info.address, 584 sizeof(store.sin.sin_addr)); 585 } else { 586 return; 587 } 588 break; 589 #endif 590 #ifdef INET6 591 case AF_INET6: 592 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) { 593 store.sin6.sin6_family = cp->heartbeat.hb_info.addr_family; 594 store.sin6.sin6_len = cp->heartbeat.hb_info.addr_len; 595 store.sin6.sin6_port = stcb->rport; 596 memcpy(&store.sin6.sin6_addr, cp->heartbeat.hb_info.address, sizeof(struct in6_addr)); 597 } else { 598 return; 599 } 600 break; 601 #endif 602 default: 603 return; 604 } 605 r_net = sctp_findnet(stcb, &store.sa); 606 if (r_net == NULL) { 607 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n"); 608 return; 609 } 610 if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) && 611 (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) && 612 (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) { 613 /* 614 * If the its a HB and it's random value is correct when can 615 * confirm the destination. 616 */ 617 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 618 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) { 619 stcb->asoc.primary_destination = r_net; 620 r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY; 621 f_net = TAILQ_FIRST(&stcb->asoc.nets); 622 if (f_net != r_net) { 623 /* 624 * first one on the list is NOT the primary 625 * sctp_cmpaddr() is much more efficient if 626 * the primary is the first on the list, 627 * make it so. 628 */ 629 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next); 630 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next); 631 } 632 req_prim = 1; 633 } 634 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 635 stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 636 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, 637 r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4); 638 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 639 } 640 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 641 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 642 stcb->asoc.overall_error_count, 643 0, 644 SCTP_FROM_SCTP_INPUT, 645 __LINE__); 646 } 647 stcb->asoc.overall_error_count = 0; 648 old_error_counter = r_net->error_count; 649 r_net->error_count = 0; 650 r_net->hb_responded = 1; 651 tv.tv_sec = cp->heartbeat.hb_info.time_value_1; 652 tv.tv_usec = cp->heartbeat.hb_info.time_value_2; 653 /* Now lets do a RTO with this */ 654 sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, 655 SCTP_RTT_FROM_NON_DATA); 656 if (!(r_net->dest_state & SCTP_ADDR_REACHABLE)) { 657 r_net->dest_state |= SCTP_ADDR_REACHABLE; 658 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb, 659 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 660 } 661 if (r_net->dest_state & SCTP_ADDR_PF) { 662 r_net->dest_state &= ~SCTP_ADDR_PF; 663 stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net); 664 } 665 if (old_error_counter > 0) { 666 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 667 stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_5); 668 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 669 } 670 if (r_net == stcb->asoc.primary_destination) { 671 if (stcb->asoc.alternate) { 672 /* release the alternate, primary is good */ 673 sctp_free_remote_addr(stcb->asoc.alternate); 674 stcb->asoc.alternate = NULL; 675 } 676 } 677 /* Mobility adaptation */ 678 if (req_prim) { 679 if ((sctp_is_mobility_feature_on(stcb->sctp_ep, 680 SCTP_MOBILITY_BASE) || 681 sctp_is_mobility_feature_on(stcb->sctp_ep, 682 SCTP_MOBILITY_FASTHANDOFF)) && 683 sctp_is_mobility_feature_on(stcb->sctp_ep, 684 SCTP_MOBILITY_PRIM_DELETED)) { 685 sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED, 686 stcb->sctp_ep, stcb, NULL, 687 SCTP_FROM_SCTP_INPUT + SCTP_LOC_6); 688 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 689 SCTP_MOBILITY_FASTHANDOFF)) { 690 sctp_assoc_immediate_retrans(stcb, 691 stcb->asoc.primary_destination); 692 } 693 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 694 SCTP_MOBILITY_BASE)) { 695 sctp_move_chunks_from_net(stcb, 696 stcb->asoc.deleted_primary); 697 } 698 sctp_delete_prim_timer(stcb->sctp_ep, stcb); 699 } 700 } 701 } 702 703 static int 704 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb) 705 { 706 /* 707 * Return 0 means we want you to proceed with the abort non-zero 708 * means no abort processing. 709 */ 710 uint32_t new_vtag; 711 struct sctpasochead *head; 712 713 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || 714 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 715 new_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 716 atomic_add_int(&stcb->asoc.refcnt, 1); 717 SCTP_TCB_UNLOCK(stcb); 718 SCTP_INP_INFO_WLOCK(); 719 SCTP_TCB_LOCK(stcb); 720 atomic_subtract_int(&stcb->asoc.refcnt, 1); 721 } else { 722 return (0); 723 } 724 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) { 725 /* generate a new vtag and send init */ 726 LIST_REMOVE(stcb, sctp_asocs); 727 stcb->asoc.my_vtag = new_vtag; 728 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 729 /* 730 * put it in the bucket in the vtag hash of assoc's for the 731 * system 732 */ 733 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 734 SCTP_INP_INFO_WUNLOCK(); 735 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 736 return (1); 737 } else { 738 /* 739 * treat like a case where the cookie expired i.e.: - dump 740 * current cookie. - generate a new vtag. - resend init. 741 */ 742 /* generate a new vtag and send init */ 743 LIST_REMOVE(stcb, sctp_asocs); 744 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT); 745 sctp_stop_all_cookie_timers(stcb); 746 sctp_toss_old_cookies(stcb, &stcb->asoc); 747 stcb->asoc.my_vtag = new_vtag; 748 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 749 /* 750 * put it in the bucket in the vtag hash of assoc's for the 751 * system 752 */ 753 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 754 SCTP_INP_INFO_WUNLOCK(); 755 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 756 return (1); 757 } 758 return (0); 759 } 760 761 static int 762 sctp_handle_nat_missing_state(struct sctp_tcb *stcb, 763 struct sctp_nets *net) 764 { 765 /* 766 * return 0 means we want you to proceed with the abort non-zero 767 * means no abort processing 768 */ 769 if (stcb->asoc.auth_supported == 0) { 770 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n"); 771 return (0); 772 } 773 sctp_asconf_send_nat_state_update(stcb, net); 774 return (1); 775 } 776 777 /* Returns 1 if the stcb was aborted, 0 otherwise */ 778 static int 779 sctp_handle_abort(struct sctp_abort_chunk *abort, 780 struct sctp_tcb *stcb, struct sctp_nets *net) 781 { 782 uint16_t len; 783 uint16_t error; 784 785 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n"); 786 if (stcb == NULL) 787 return (0); 788 789 len = ntohs(abort->ch.chunk_length); 790 if (len >= sizeof(struct sctp_chunkhdr) + sizeof(struct sctp_error_cause)) { 791 /* 792 * Need to check the cause codes for our two magic nat 793 * aborts which don't kill the assoc necessarily. 794 */ 795 struct sctp_error_cause *cause; 796 797 cause = (struct sctp_error_cause *)(abort + 1); 798 error = ntohs(cause->code); 799 if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) { 800 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state, ABORT flags:%x\n", 801 abort->ch.chunk_flags); 802 if (sctp_handle_nat_colliding_state(stcb)) { 803 return (0); 804 } 805 } else if (error == SCTP_CAUSE_NAT_MISSING_STATE) { 806 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state, ABORT flags:%x\n", 807 abort->ch.chunk_flags); 808 if (sctp_handle_nat_missing_state(stcb, net)) { 809 return (0); 810 } 811 } 812 } else { 813 error = 0; 814 } 815 /* stop any receive timers */ 816 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, NULL, 817 SCTP_FROM_SCTP_INPUT + SCTP_LOC_7); 818 /* notify user of the abort and clean up... */ 819 sctp_abort_notification(stcb, 1, error, abort, SCTP_SO_NOT_LOCKED); 820 /* free the tcb */ 821 SCTP_STAT_INCR_COUNTER32(sctps_aborted); 822 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) || 823 (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 824 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 825 } 826 #ifdef SCTP_ASOCLOG_OF_TSNS 827 sctp_print_out_track_log(stcb); 828 #endif 829 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 830 SCTP_FROM_SCTP_INPUT + SCTP_LOC_8); 831 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n"); 832 return (1); 833 } 834 835 static void 836 sctp_start_net_timers(struct sctp_tcb *stcb) 837 { 838 uint32_t cnt_hb_sent; 839 struct sctp_nets *net; 840 841 cnt_hb_sent = 0; 842 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 843 /* 844 * For each network start: 1) A pmtu timer. 2) A HB timer 3) 845 * If the dest in unconfirmed send a hb as well if under 846 * max_hb_burst have been sent. 847 */ 848 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net); 849 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net); 850 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) && 851 (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) { 852 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 853 cnt_hb_sent++; 854 } 855 } 856 if (cnt_hb_sent) { 857 sctp_chunk_output(stcb->sctp_ep, stcb, 858 SCTP_OUTPUT_FROM_COOKIE_ACK, 859 SCTP_SO_NOT_LOCKED); 860 } 861 } 862 863 static void 864 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp, 865 struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag) 866 { 867 struct sctp_association *asoc; 868 int some_on_streamwheel; 869 int old_state; 870 871 SCTPDBG(SCTP_DEBUG_INPUT2, 872 "sctp_handle_shutdown: handling SHUTDOWN\n"); 873 if (stcb == NULL) 874 return; 875 asoc = &stcb->asoc; 876 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || 877 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 878 return; 879 } 880 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) { 881 /* Shutdown NOT the expected size */ 882 return; 883 } 884 old_state = SCTP_GET_STATE(stcb); 885 sctp_update_acked(stcb, cp, abort_flag); 886 if (*abort_flag) { 887 return; 888 } 889 if (asoc->control_pdapi) { 890 /* 891 * With a normal shutdown we assume the end of last record. 892 */ 893 SCTP_INP_READ_LOCK(stcb->sctp_ep); 894 if (asoc->control_pdapi->on_strm_q) { 895 struct sctp_stream_in *strm; 896 897 strm = &asoc->strmin[asoc->control_pdapi->sinfo_stream]; 898 if (asoc->control_pdapi->on_strm_q == SCTP_ON_UNORDERED) { 899 /* Unordered */ 900 TAILQ_REMOVE(&strm->uno_inqueue, asoc->control_pdapi, next_instrm); 901 asoc->control_pdapi->on_strm_q = 0; 902 } else if (asoc->control_pdapi->on_strm_q == SCTP_ON_ORDERED) { 903 /* Ordered */ 904 TAILQ_REMOVE(&strm->inqueue, asoc->control_pdapi, next_instrm); 905 asoc->control_pdapi->on_strm_q = 0; 906 #ifdef INVARIANTS 907 } else { 908 panic("Unknown state on ctrl:%p on_strm_q:%d", 909 asoc->control_pdapi, 910 asoc->control_pdapi->on_strm_q); 911 #endif 912 } 913 } 914 asoc->control_pdapi->end_added = 1; 915 asoc->control_pdapi->pdapi_aborted = 1; 916 asoc->control_pdapi = NULL; 917 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 918 if (stcb->sctp_socket) { 919 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 920 } 921 } 922 /* goto SHUTDOWN_RECEIVED state to block new requests */ 923 if (stcb->sctp_socket) { 924 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) && 925 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) && 926 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT)) { 927 SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_RECEIVED); 928 /* 929 * notify upper layer that peer has initiated a 930 * shutdown 931 */ 932 sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 933 934 /* reset time */ 935 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 936 } 937 } 938 if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) { 939 /* 940 * stop the shutdown timer, since we WILL move to 941 * SHUTDOWN-ACK-SENT. 942 */ 943 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, 944 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9); 945 } 946 /* Now is there unsent data on a stream somewhere? */ 947 some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED); 948 949 if (!TAILQ_EMPTY(&asoc->send_queue) || 950 !TAILQ_EMPTY(&asoc->sent_queue) || 951 some_on_streamwheel) { 952 /* By returning we will push more data out */ 953 return; 954 } else { 955 /* no outstanding data to send, so move on... */ 956 /* send SHUTDOWN-ACK */ 957 /* move to SHUTDOWN-ACK-SENT state */ 958 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) || 959 (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 960 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 961 } 962 if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 963 SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_ACK_SENT); 964 sctp_stop_timers_for_shutdown(stcb); 965 sctp_send_shutdown_ack(stcb, net); 966 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, 967 stcb->sctp_ep, stcb, net); 968 } else if (old_state == SCTP_STATE_SHUTDOWN_ACK_SENT) { 969 sctp_send_shutdown_ack(stcb, net); 970 } 971 } 972 } 973 974 static void 975 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED, 976 struct sctp_tcb *stcb, 977 struct sctp_nets *net) 978 { 979 struct sctp_association *asoc; 980 981 SCTPDBG(SCTP_DEBUG_INPUT2, 982 "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n"); 983 if (stcb == NULL) 984 return; 985 986 asoc = &stcb->asoc; 987 /* process according to association state */ 988 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || 989 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 990 /* unexpected SHUTDOWN-ACK... do OOTB handling... */ 991 sctp_send_shutdown_complete(stcb, net, 1); 992 SCTP_TCB_UNLOCK(stcb); 993 return; 994 } 995 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) && 996 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) { 997 /* unexpected SHUTDOWN-ACK... so ignore... */ 998 SCTP_TCB_UNLOCK(stcb); 999 return; 1000 } 1001 if (asoc->control_pdapi) { 1002 /* 1003 * With a normal shutdown we assume the end of last record. 1004 */ 1005 SCTP_INP_READ_LOCK(stcb->sctp_ep); 1006 asoc->control_pdapi->end_added = 1; 1007 asoc->control_pdapi->pdapi_aborted = 1; 1008 asoc->control_pdapi = NULL; 1009 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 1010 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 1011 } 1012 #ifdef INVARIANTS 1013 if (!TAILQ_EMPTY(&asoc->send_queue) || 1014 !TAILQ_EMPTY(&asoc->sent_queue) || 1015 sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) { 1016 panic("Queues are not empty when handling SHUTDOWN-ACK"); 1017 } 1018 #endif 1019 /* stop the timer */ 1020 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, 1021 SCTP_FROM_SCTP_INPUT + SCTP_LOC_10); 1022 /* send SHUTDOWN-COMPLETE */ 1023 sctp_send_shutdown_complete(stcb, net, 0); 1024 /* notify upper layer protocol */ 1025 if (stcb->sctp_socket) { 1026 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1027 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 1028 stcb->sctp_socket->so_snd.sb_cc = 0; 1029 } 1030 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 1031 } 1032 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 1033 /* free the TCB but first save off the ep */ 1034 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1035 SCTP_FROM_SCTP_INPUT + SCTP_LOC_11); 1036 } 1037 1038 static void 1039 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, uint8_t chunk_type) 1040 { 1041 switch (chunk_type) { 1042 case SCTP_ASCONF_ACK: 1043 case SCTP_ASCONF: 1044 sctp_asconf_cleanup(stcb); 1045 break; 1046 case SCTP_IFORWARD_CUM_TSN: 1047 case SCTP_FORWARD_CUM_TSN: 1048 stcb->asoc.prsctp_supported = 0; 1049 break; 1050 default: 1051 SCTPDBG(SCTP_DEBUG_INPUT2, 1052 "Peer does not support chunk type %d (0x%x).\n", 1053 chunk_type, chunk_type); 1054 break; 1055 } 1056 } 1057 1058 /* 1059 * Skip past the param header and then we will find the param that caused the 1060 * problem. There are a number of param's in a ASCONF OR the prsctp param 1061 * these will turn of specific features. 1062 * XXX: Is this the right thing to do? 1063 */ 1064 static void 1065 sctp_process_unrecog_param(struct sctp_tcb *stcb, uint16_t parameter_type) 1066 { 1067 switch (parameter_type) { 1068 /* pr-sctp draft */ 1069 case SCTP_PRSCTP_SUPPORTED: 1070 stcb->asoc.prsctp_supported = 0; 1071 break; 1072 case SCTP_SUPPORTED_CHUNK_EXT: 1073 break; 1074 /* draft-ietf-tsvwg-addip-sctp */ 1075 case SCTP_HAS_NAT_SUPPORT: 1076 stcb->asoc.peer_supports_nat = 0; 1077 break; 1078 case SCTP_ADD_IP_ADDRESS: 1079 case SCTP_DEL_IP_ADDRESS: 1080 case SCTP_SET_PRIM_ADDR: 1081 stcb->asoc.asconf_supported = 0; 1082 break; 1083 case SCTP_SUCCESS_REPORT: 1084 case SCTP_ERROR_CAUSE_IND: 1085 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n"); 1086 SCTPDBG(SCTP_DEBUG_INPUT2, 1087 "Turning off ASCONF to this strange peer\n"); 1088 stcb->asoc.asconf_supported = 0; 1089 break; 1090 default: 1091 SCTPDBG(SCTP_DEBUG_INPUT2, 1092 "Peer does not support param type %d (0x%x)??\n", 1093 parameter_type, parameter_type); 1094 break; 1095 } 1096 } 1097 1098 static int 1099 sctp_handle_error(struct sctp_chunkhdr *ch, 1100 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 1101 { 1102 struct sctp_error_cause *cause; 1103 struct sctp_association *asoc; 1104 uint32_t remaining_length, adjust; 1105 uint16_t code, cause_code, cause_length; 1106 1107 /* parse through all of the errors and process */ 1108 asoc = &stcb->asoc; 1109 cause = (struct sctp_error_cause *)((caddr_t)ch + 1110 sizeof(struct sctp_chunkhdr)); 1111 remaining_length = ntohs(ch->chunk_length); 1112 if (remaining_length > limit) { 1113 remaining_length = limit; 1114 } 1115 if (remaining_length >= sizeof(struct sctp_chunkhdr)) { 1116 remaining_length -= sizeof(struct sctp_chunkhdr); 1117 } else { 1118 remaining_length = 0; 1119 } 1120 code = 0; 1121 while (remaining_length >= sizeof(struct sctp_error_cause)) { 1122 /* Process an Error Cause */ 1123 cause_code = ntohs(cause->code); 1124 cause_length = ntohs(cause->length); 1125 if ((cause_length > remaining_length) || (cause_length == 0)) { 1126 /* Invalid cause length, possibly due to truncation. */ 1127 SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in cause - bytes left: %u cause length: %u\n", 1128 remaining_length, cause_length); 1129 return (0); 1130 } 1131 if (code == 0) { 1132 /* report the first error cause */ 1133 code = cause_code; 1134 } 1135 switch (cause_code) { 1136 case SCTP_CAUSE_INVALID_STREAM: 1137 case SCTP_CAUSE_MISSING_PARAM: 1138 case SCTP_CAUSE_INVALID_PARAM: 1139 case SCTP_CAUSE_NO_USER_DATA: 1140 SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %u back? We have a bug :/ (or do they?)\n", 1141 cause_code); 1142 break; 1143 case SCTP_CAUSE_NAT_COLLIDING_STATE: 1144 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state, ERROR flags: %x\n", 1145 ch->chunk_flags); 1146 if (sctp_handle_nat_colliding_state(stcb)) { 1147 return (0); 1148 } 1149 break; 1150 case SCTP_CAUSE_NAT_MISSING_STATE: 1151 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state, ERROR flags: %x\n", 1152 ch->chunk_flags); 1153 if (sctp_handle_nat_missing_state(stcb, net)) { 1154 return (0); 1155 } 1156 break; 1157 case SCTP_CAUSE_STALE_COOKIE: 1158 /* 1159 * We only act if we have echoed a cookie and are 1160 * waiting. 1161 */ 1162 if ((cause_length >= sizeof(struct sctp_error_stale_cookie)) && 1163 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 1164 struct sctp_error_stale_cookie *stale_cookie; 1165 1166 stale_cookie = (struct sctp_error_stale_cookie *)cause; 1167 /* stable_time is in usec, convert to msec. */ 1168 asoc->cookie_preserve_req = ntohl(stale_cookie->stale_time) / 1000; 1169 /* Double it to be more robust on RTX. */ 1170 asoc->cookie_preserve_req *= 2; 1171 asoc->stale_cookie_count++; 1172 if (asoc->stale_cookie_count > 1173 asoc->max_init_times) { 1174 sctp_abort_notification(stcb, 0, 0, NULL, SCTP_SO_NOT_LOCKED); 1175 /* now free the asoc */ 1176 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1177 SCTP_FROM_SCTP_INPUT + SCTP_LOC_12); 1178 return (-1); 1179 } 1180 /* blast back to INIT state */ 1181 sctp_toss_old_cookies(stcb, &stcb->asoc); 1182 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT); 1183 sctp_stop_all_cookie_timers(stcb); 1184 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 1185 } 1186 break; 1187 case SCTP_CAUSE_UNRESOLVABLE_ADDR: 1188 /* 1189 * Nothing we can do here, we don't do hostname 1190 * addresses so if the peer does not like my IPv6 1191 * (or IPv4 for that matter) it does not matter. If 1192 * they don't support that type of address, they can 1193 * NOT possibly get that packet type... i.e. with no 1194 * IPv6 you can't receive a IPv6 packet. so we can 1195 * safely ignore this one. If we ever added support 1196 * for HOSTNAME Addresses, then we would need to do 1197 * something here. 1198 */ 1199 break; 1200 case SCTP_CAUSE_UNRECOG_CHUNK: 1201 if (cause_length >= sizeof(struct sctp_error_unrecognized_chunk)) { 1202 struct sctp_error_unrecognized_chunk *unrec_chunk; 1203 1204 unrec_chunk = (struct sctp_error_unrecognized_chunk *)cause; 1205 sctp_process_unrecog_chunk(stcb, unrec_chunk->ch.chunk_type); 1206 } 1207 break; 1208 case SCTP_CAUSE_UNRECOG_PARAM: 1209 /* XXX: We only consider the first parameter */ 1210 if (cause_length >= sizeof(struct sctp_error_cause) + sizeof(struct sctp_paramhdr)) { 1211 struct sctp_paramhdr *unrec_parameter; 1212 1213 unrec_parameter = (struct sctp_paramhdr *)(cause + 1); 1214 sctp_process_unrecog_param(stcb, ntohs(unrec_parameter->param_type)); 1215 } 1216 break; 1217 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN: 1218 /* 1219 * We ignore this since the timer will drive out a 1220 * new cookie anyway and there timer will drive us 1221 * to send a SHUTDOWN_COMPLETE. We can't send one 1222 * here since we don't have their tag. 1223 */ 1224 break; 1225 case SCTP_CAUSE_DELETING_LAST_ADDR: 1226 case SCTP_CAUSE_RESOURCE_SHORTAGE: 1227 case SCTP_CAUSE_DELETING_SRC_ADDR: 1228 /* 1229 * We should NOT get these here, but in a 1230 * ASCONF-ACK. 1231 */ 1232 SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a error cause with code %u.\n", 1233 cause_code); 1234 break; 1235 case SCTP_CAUSE_OUT_OF_RESC: 1236 /* 1237 * And what, pray tell do we do with the fact that 1238 * the peer is out of resources? Not really sure we 1239 * could do anything but abort. I suspect this 1240 * should have came WITH an abort instead of in a 1241 * OP-ERROR. 1242 */ 1243 break; 1244 default: 1245 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown code 0x%x\n", 1246 cause_code); 1247 break; 1248 } 1249 adjust = SCTP_SIZE32(cause_length); 1250 if (remaining_length >= adjust) { 1251 remaining_length -= adjust; 1252 } else { 1253 remaining_length = 0; 1254 } 1255 cause = (struct sctp_error_cause *)((caddr_t)cause + adjust); 1256 } 1257 sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, code, ch, SCTP_SO_NOT_LOCKED); 1258 return (0); 1259 } 1260 1261 static int 1262 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset, 1263 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 1264 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 1265 struct sctp_nets *net, int *abort_no_unlock, 1266 uint8_t mflowtype, uint32_t mflowid, 1267 uint32_t vrf_id) 1268 { 1269 struct sctp_init_ack *init_ack; 1270 struct mbuf *op_err; 1271 1272 SCTPDBG(SCTP_DEBUG_INPUT2, 1273 "sctp_handle_init_ack: handling INIT-ACK\n"); 1274 1275 if (stcb == NULL) { 1276 SCTPDBG(SCTP_DEBUG_INPUT2, 1277 "sctp_handle_init_ack: TCB is null\n"); 1278 return (-1); 1279 } 1280 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) { 1281 /* Invalid length */ 1282 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1283 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1284 src, dst, sh, op_err, 1285 mflowtype, mflowid, 1286 vrf_id, net->port); 1287 *abort_no_unlock = 1; 1288 return (-1); 1289 } 1290 init_ack = &cp->init; 1291 /* validate parameters */ 1292 if (init_ack->initiate_tag == 0) { 1293 /* protocol error... send an abort */ 1294 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1295 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1296 src, dst, sh, op_err, 1297 mflowtype, mflowid, 1298 vrf_id, net->port); 1299 *abort_no_unlock = 1; 1300 return (-1); 1301 } 1302 if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) { 1303 /* protocol error... send an abort */ 1304 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1305 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1306 src, dst, sh, op_err, 1307 mflowtype, mflowid, 1308 vrf_id, net->port); 1309 *abort_no_unlock = 1; 1310 return (-1); 1311 } 1312 if (init_ack->num_inbound_streams == 0) { 1313 /* protocol error... send an abort */ 1314 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1315 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1316 src, dst, sh, op_err, 1317 mflowtype, mflowid, 1318 vrf_id, net->port); 1319 *abort_no_unlock = 1; 1320 return (-1); 1321 } 1322 if (init_ack->num_outbound_streams == 0) { 1323 /* protocol error... send an abort */ 1324 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1325 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1326 src, dst, sh, op_err, 1327 mflowtype, mflowid, 1328 vrf_id, net->port); 1329 *abort_no_unlock = 1; 1330 return (-1); 1331 } 1332 /* process according to association state... */ 1333 switch (SCTP_GET_STATE(stcb)) { 1334 case SCTP_STATE_COOKIE_WAIT: 1335 /* this is the expected state for this chunk */ 1336 /* process the INIT-ACK parameters */ 1337 if (stcb->asoc.primary_destination->dest_state & 1338 SCTP_ADDR_UNCONFIRMED) { 1339 /* 1340 * The primary is where we sent the INIT, we can 1341 * always consider it confirmed when the INIT-ACK is 1342 * returned. Do this before we load addresses 1343 * though. 1344 */ 1345 stcb->asoc.primary_destination->dest_state &= 1346 ~SCTP_ADDR_UNCONFIRMED; 1347 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 1348 stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED); 1349 } 1350 if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb, 1351 net, abort_no_unlock, 1352 mflowtype, mflowid, 1353 vrf_id) < 0) { 1354 /* error in parsing parameters */ 1355 return (-1); 1356 } 1357 /* update our state */ 1358 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n"); 1359 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_ECHOED); 1360 1361 /* reset the RTO calc */ 1362 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 1363 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 1364 stcb->asoc.overall_error_count, 1365 0, 1366 SCTP_FROM_SCTP_INPUT, 1367 __LINE__); 1368 } 1369 stcb->asoc.overall_error_count = 0; 1370 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 1371 /* 1372 * collapse the init timer back in case of a exponential 1373 * backoff 1374 */ 1375 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep, 1376 stcb, net); 1377 /* 1378 * the send at the end of the inbound data processing will 1379 * cause the cookie to be sent 1380 */ 1381 break; 1382 case SCTP_STATE_SHUTDOWN_SENT: 1383 /* incorrect state... discard */ 1384 break; 1385 case SCTP_STATE_COOKIE_ECHOED: 1386 /* incorrect state... discard */ 1387 break; 1388 case SCTP_STATE_OPEN: 1389 /* incorrect state... discard */ 1390 break; 1391 case SCTP_STATE_EMPTY: 1392 case SCTP_STATE_INUSE: 1393 default: 1394 /* incorrect state... discard */ 1395 return (-1); 1396 break; 1397 } 1398 SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n"); 1399 return (0); 1400 } 1401 1402 static struct sctp_tcb * 1403 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1404 struct sockaddr *src, struct sockaddr *dst, 1405 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1406 struct sctp_inpcb *inp, struct sctp_nets **netp, 1407 struct sockaddr *init_src, int *notification, 1408 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1409 uint8_t mflowtype, uint32_t mflowid, 1410 uint32_t vrf_id, uint16_t port); 1411 1412 /* 1413 * handle a state cookie for an existing association m: input packet mbuf 1414 * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a 1415 * "split" mbuf and the cookie signature does not exist offset: offset into 1416 * mbuf to the cookie-echo chunk 1417 */ 1418 static struct sctp_tcb * 1419 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset, 1420 struct sockaddr *src, struct sockaddr *dst, 1421 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1422 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp, 1423 struct sockaddr *init_src, int *notification, 1424 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1425 uint8_t mflowtype, uint32_t mflowid, 1426 uint32_t vrf_id, uint16_t port) 1427 { 1428 struct sctp_association *asoc; 1429 struct sctp_init_chunk *init_cp, init_buf; 1430 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1431 struct sctp_nets *net; 1432 struct mbuf *op_err; 1433 struct timeval old; 1434 int init_offset, initack_offset, i; 1435 int retval; 1436 int spec_flag = 0; 1437 uint32_t how_indx; 1438 #if defined(SCTP_DETAILED_STR_STATS) 1439 int j; 1440 #endif 1441 1442 net = *netp; 1443 /* I know that the TCB is non-NULL from the caller */ 1444 asoc = &stcb->asoc; 1445 for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) { 1446 if (asoc->cookie_how[how_indx] == 0) 1447 break; 1448 } 1449 if (how_indx < sizeof(asoc->cookie_how)) { 1450 asoc->cookie_how[how_indx] = 1; 1451 } 1452 if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 1453 /* SHUTDOWN came in after sending INIT-ACK */ 1454 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination); 1455 op_err = sctp_generate_cause(SCTP_CAUSE_COOKIE_IN_SHUTDOWN, ""); 1456 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 1457 mflowtype, mflowid, inp->fibnum, 1458 vrf_id, net->port); 1459 if (how_indx < sizeof(asoc->cookie_how)) 1460 asoc->cookie_how[how_indx] = 2; 1461 return (NULL); 1462 } 1463 /* 1464 * find and validate the INIT chunk in the cookie (peer's info) the 1465 * INIT should start after the cookie-echo header struct (chunk 1466 * header, state cookie header struct) 1467 */ 1468 init_offset = offset += sizeof(struct sctp_cookie_echo_chunk); 1469 1470 init_cp = (struct sctp_init_chunk *) 1471 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 1472 (uint8_t *)&init_buf); 1473 if (init_cp == NULL) { 1474 /* could not pull a INIT chunk in cookie */ 1475 return (NULL); 1476 } 1477 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 1478 return (NULL); 1479 } 1480 /* 1481 * find and validate the INIT-ACK chunk in the cookie (my info) the 1482 * INIT-ACK follows the INIT chunk 1483 */ 1484 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 1485 initack_cp = (struct sctp_init_ack_chunk *) 1486 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 1487 (uint8_t *)&initack_buf); 1488 if (initack_cp == NULL) { 1489 /* could not pull INIT-ACK chunk in cookie */ 1490 return (NULL); 1491 } 1492 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 1493 return (NULL); 1494 } 1495 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1496 (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) { 1497 /* 1498 * case D in Section 5.2.4 Table 2: MMAA process accordingly 1499 * to get into the OPEN state 1500 */ 1501 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1502 /*- 1503 * Opps, this means that we somehow generated two vtag's 1504 * the same. I.e. we did: 1505 * Us Peer 1506 * <---INIT(tag=a)------ 1507 * ----INIT-ACK(tag=t)--> 1508 * ----INIT(tag=t)------> *1 1509 * <---INIT-ACK(tag=a)--- 1510 * <----CE(tag=t)------------- *2 1511 * 1512 * At point *1 we should be generating a different 1513 * tag t'. Which means we would throw away the CE and send 1514 * ours instead. Basically this is case C (throw away side). 1515 */ 1516 if (how_indx < sizeof(asoc->cookie_how)) 1517 asoc->cookie_how[how_indx] = 17; 1518 return (NULL); 1519 } 1520 switch (SCTP_GET_STATE(stcb)) { 1521 case SCTP_STATE_COOKIE_WAIT: 1522 case SCTP_STATE_COOKIE_ECHOED: 1523 /* 1524 * INIT was sent but got a COOKIE_ECHO with the 1525 * correct tags... just accept it...but we must 1526 * process the init so that we can make sure we have 1527 * the right seq no's. 1528 */ 1529 /* First we must process the INIT !! */ 1530 retval = sctp_process_init(init_cp, stcb); 1531 if (retval < 0) { 1532 if (how_indx < sizeof(asoc->cookie_how)) 1533 asoc->cookie_how[how_indx] = 3; 1534 return (NULL); 1535 } 1536 /* we have already processed the INIT so no problem */ 1537 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, 1538 stcb, net, 1539 SCTP_FROM_SCTP_INPUT + SCTP_LOC_13); 1540 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, 1541 stcb, net, 1542 SCTP_FROM_SCTP_INPUT + SCTP_LOC_14); 1543 /* update current state */ 1544 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) 1545 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1546 else 1547 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1548 1549 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 1550 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1551 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1552 stcb->sctp_ep, stcb, NULL); 1553 } 1554 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1555 sctp_stop_all_cookie_timers(stcb); 1556 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1557 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1558 (!SCTP_IS_LISTENING(inp))) { 1559 /* 1560 * Here is where collision would go if we 1561 * did a connect() and instead got a 1562 * init/init-ack/cookie done before the 1563 * init-ack came back.. 1564 */ 1565 stcb->sctp_ep->sctp_flags |= 1566 SCTP_PCB_FLAGS_CONNECTED; 1567 soisconnected(stcb->sctp_socket); 1568 } 1569 /* notify upper layer */ 1570 *notification = SCTP_NOTIFY_ASSOC_UP; 1571 /* 1572 * since we did not send a HB make sure we don't 1573 * double things 1574 */ 1575 old.tv_sec = cookie->time_entered.tv_sec; 1576 old.tv_usec = cookie->time_entered.tv_usec; 1577 net->hb_responded = 1; 1578 sctp_calculate_rto(stcb, asoc, net, &old, 1579 SCTP_RTT_FROM_NON_DATA); 1580 1581 if (stcb->asoc.sctp_autoclose_ticks && 1582 (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) { 1583 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 1584 inp, stcb, NULL); 1585 } 1586 break; 1587 default: 1588 /* 1589 * we're in the OPEN state (or beyond), so peer must 1590 * have simply lost the COOKIE-ACK 1591 */ 1592 break; 1593 } /* end switch */ 1594 sctp_stop_all_cookie_timers(stcb); 1595 /* 1596 * We ignore the return code here.. not sure if we should 1597 * somehow abort.. but we do have an existing asoc. This 1598 * really should not fail. 1599 */ 1600 if (sctp_load_addresses_from_init(stcb, m, 1601 init_offset + sizeof(struct sctp_init_chunk), 1602 initack_offset, src, dst, init_src, stcb->asoc.port)) { 1603 if (how_indx < sizeof(asoc->cookie_how)) 1604 asoc->cookie_how[how_indx] = 4; 1605 return (NULL); 1606 } 1607 /* respond with a COOKIE-ACK */ 1608 sctp_toss_old_cookies(stcb, asoc); 1609 sctp_send_cookie_ack(stcb); 1610 if (how_indx < sizeof(asoc->cookie_how)) 1611 asoc->cookie_how[how_indx] = 5; 1612 return (stcb); 1613 } 1614 1615 if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1616 ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag && 1617 cookie->tie_tag_my_vtag == 0 && 1618 cookie->tie_tag_peer_vtag == 0) { 1619 /* 1620 * case C in Section 5.2.4 Table 2: XMOO silently discard 1621 */ 1622 if (how_indx < sizeof(asoc->cookie_how)) 1623 asoc->cookie_how[how_indx] = 6; 1624 return (NULL); 1625 } 1626 /* 1627 * If nat support, and the below and stcb is established, send back 1628 * a ABORT(colliding state) if we are established. 1629 */ 1630 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) && 1631 (asoc->peer_supports_nat) && 1632 ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1633 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1634 (asoc->peer_vtag == 0)))) { 1635 /* 1636 * Special case - Peer's support nat. We may have two init's 1637 * that we gave out the same tag on since one was not 1638 * established.. i.e. we get INIT from host-1 behind the nat 1639 * and we respond tag-a, we get a INIT from host-2 behind 1640 * the nat and we get tag-a again. Then we bring up host-1 1641 * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1). 1642 * Now we have colliding state. We must send an abort here 1643 * with colliding state indication. 1644 */ 1645 op_err = sctp_generate_cause(SCTP_CAUSE_NAT_COLLIDING_STATE, ""); 1646 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err, 1647 mflowtype, mflowid, inp->fibnum, 1648 vrf_id, port); 1649 return (NULL); 1650 } 1651 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1652 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1653 (asoc->peer_vtag == 0))) { 1654 /* 1655 * case B in Section 5.2.4 Table 2: MXAA or MOAA my info 1656 * should be ok, re-accept peer info 1657 */ 1658 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1659 /* 1660 * Extension of case C. If we hit this, then the 1661 * random number generator returned the same vtag 1662 * when we first sent our INIT-ACK and when we later 1663 * sent our INIT. The side with the seq numbers that 1664 * are different will be the one that normnally 1665 * would have hit case C. This in effect "extends" 1666 * our vtags in this collision case to be 64 bits. 1667 * The same collision could occur aka you get both 1668 * vtag and seq number the same twice in a row.. but 1669 * is much less likely. If it did happen then we 1670 * would proceed through and bring up the assoc.. we 1671 * may end up with the wrong stream setup however.. 1672 * which would be bad.. but there is no way to 1673 * tell.. until we send on a stream that does not 1674 * exist :-) 1675 */ 1676 if (how_indx < sizeof(asoc->cookie_how)) 1677 asoc->cookie_how[how_indx] = 7; 1678 1679 return (NULL); 1680 } 1681 if (how_indx < sizeof(asoc->cookie_how)) 1682 asoc->cookie_how[how_indx] = 8; 1683 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, 1684 SCTP_FROM_SCTP_INPUT + SCTP_LOC_15); 1685 sctp_stop_all_cookie_timers(stcb); 1686 /* 1687 * since we did not send a HB make sure we don't double 1688 * things 1689 */ 1690 net->hb_responded = 1; 1691 if (stcb->asoc.sctp_autoclose_ticks && 1692 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 1693 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, 1694 NULL); 1695 } 1696 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1697 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 1698 1699 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) { 1700 /* 1701 * Ok the peer probably discarded our data (if we 1702 * echoed a cookie+data). So anything on the 1703 * sent_queue should be marked for retransmit, we 1704 * may not get something to kick us so it COULD 1705 * still take a timeout to move these.. but it can't 1706 * hurt to mark them. 1707 */ 1708 struct sctp_tmit_chunk *chk; 1709 1710 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 1711 if (chk->sent < SCTP_DATAGRAM_RESEND) { 1712 chk->sent = SCTP_DATAGRAM_RESEND; 1713 sctp_flight_size_decrease(chk); 1714 sctp_total_flight_decrease(stcb, chk); 1715 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 1716 spec_flag++; 1717 } 1718 } 1719 } 1720 /* process the INIT info (peer's info) */ 1721 retval = sctp_process_init(init_cp, stcb); 1722 if (retval < 0) { 1723 if (how_indx < sizeof(asoc->cookie_how)) 1724 asoc->cookie_how[how_indx] = 9; 1725 return (NULL); 1726 } 1727 if (sctp_load_addresses_from_init(stcb, m, 1728 init_offset + sizeof(struct sctp_init_chunk), 1729 initack_offset, src, dst, init_src, stcb->asoc.port)) { 1730 if (how_indx < sizeof(asoc->cookie_how)) 1731 asoc->cookie_how[how_indx] = 10; 1732 return (NULL); 1733 } 1734 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || 1735 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 1736 *notification = SCTP_NOTIFY_ASSOC_UP; 1737 1738 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1739 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1740 (!SCTP_IS_LISTENING(inp))) { 1741 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 1742 soisconnected(stcb->sctp_socket); 1743 } 1744 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) 1745 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1746 else 1747 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1748 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1749 } else if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) { 1750 SCTP_STAT_INCR_COUNTER32(sctps_restartestab); 1751 } else { 1752 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1753 } 1754 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 1755 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1756 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1757 stcb->sctp_ep, stcb, NULL); 1758 } 1759 sctp_stop_all_cookie_timers(stcb); 1760 sctp_toss_old_cookies(stcb, asoc); 1761 sctp_send_cookie_ack(stcb); 1762 if (spec_flag) { 1763 /* 1764 * only if we have retrans set do we do this. What 1765 * this call does is get only the COOKIE-ACK out and 1766 * then when we return the normal call to 1767 * sctp_chunk_output will get the retrans out behind 1768 * this. 1769 */ 1770 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED); 1771 } 1772 if (how_indx < sizeof(asoc->cookie_how)) 1773 asoc->cookie_how[how_indx] = 11; 1774 1775 return (stcb); 1776 } 1777 if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1778 ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) && 1779 cookie->tie_tag_my_vtag == asoc->my_vtag_nonce && 1780 cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce && 1781 cookie->tie_tag_peer_vtag != 0) { 1782 struct sctpasochead *head; 1783 1784 if (asoc->peer_supports_nat) { 1785 /* 1786 * This is a gross gross hack. Just call the 1787 * cookie_new code since we are allowing a duplicate 1788 * association. I hope this works... 1789 */ 1790 return (sctp_process_cookie_new(m, iphlen, offset, src, dst, 1791 sh, cookie, cookie_len, 1792 inp, netp, init_src, notification, 1793 auth_skipped, auth_offset, auth_len, 1794 mflowtype, mflowid, 1795 vrf_id, port)); 1796 } 1797 /* 1798 * case A in Section 5.2.4 Table 2: XXMM (peer restarted) 1799 */ 1800 /* temp code */ 1801 if (how_indx < sizeof(asoc->cookie_how)) 1802 asoc->cookie_how[how_indx] = 12; 1803 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, 1804 SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 1805 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, 1806 SCTP_FROM_SCTP_INPUT + SCTP_LOC_17); 1807 1808 /* notify upper layer */ 1809 *notification = SCTP_NOTIFY_ASSOC_RESTART; 1810 atomic_add_int(&stcb->asoc.refcnt, 1); 1811 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_OPEN) && 1812 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) && 1813 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT)) { 1814 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1815 } 1816 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) { 1817 SCTP_STAT_INCR_GAUGE32(sctps_restartestab); 1818 } else if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) { 1819 SCTP_STAT_INCR_GAUGE32(sctps_collisionestab); 1820 } 1821 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1822 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 1823 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1824 stcb->sctp_ep, stcb, NULL); 1825 1826 } else if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) { 1827 /* move to OPEN state, if not in SHUTDOWN_SENT */ 1828 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 1829 } 1830 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 1831 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 1832 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 1833 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 1834 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 1835 asoc->str_reset_seq_in = asoc->init_seq_number; 1836 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 1837 asoc->send_sack = 1; 1838 if (asoc->mapping_array) { 1839 memset(asoc->mapping_array, 0, 1840 asoc->mapping_array_size); 1841 } 1842 if (asoc->nr_mapping_array) { 1843 memset(asoc->nr_mapping_array, 0, 1844 asoc->mapping_array_size); 1845 } 1846 SCTP_TCB_UNLOCK(stcb); 1847 SCTP_INP_INFO_WLOCK(); 1848 SCTP_INP_WLOCK(stcb->sctp_ep); 1849 SCTP_TCB_LOCK(stcb); 1850 atomic_add_int(&stcb->asoc.refcnt, -1); 1851 /* send up all the data */ 1852 SCTP_TCB_SEND_LOCK(stcb); 1853 1854 sctp_report_all_outbound(stcb, 0, SCTP_SO_LOCKED); 1855 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 1856 stcb->asoc.strmout[i].chunks_on_queues = 0; 1857 #if defined(SCTP_DETAILED_STR_STATS) 1858 for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) { 1859 asoc->strmout[i].abandoned_sent[j] = 0; 1860 asoc->strmout[i].abandoned_unsent[j] = 0; 1861 } 1862 #else 1863 asoc->strmout[i].abandoned_sent[0] = 0; 1864 asoc->strmout[i].abandoned_unsent[0] = 0; 1865 #endif 1866 stcb->asoc.strmout[i].sid = i; 1867 stcb->asoc.strmout[i].next_mid_ordered = 0; 1868 stcb->asoc.strmout[i].next_mid_unordered = 0; 1869 stcb->asoc.strmout[i].last_msg_incomplete = 0; 1870 } 1871 /* process the INIT-ACK info (my info) */ 1872 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 1873 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1874 1875 /* pull from vtag hash */ 1876 LIST_REMOVE(stcb, sctp_asocs); 1877 /* re-insert to new vtag position */ 1878 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, 1879 SCTP_BASE_INFO(hashasocmark))]; 1880 /* 1881 * put it in the bucket in the vtag hash of assoc's for the 1882 * system 1883 */ 1884 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 1885 1886 SCTP_TCB_SEND_UNLOCK(stcb); 1887 SCTP_INP_WUNLOCK(stcb->sctp_ep); 1888 SCTP_INP_INFO_WUNLOCK(); 1889 asoc->total_flight = 0; 1890 asoc->total_flight_count = 0; 1891 /* process the INIT info (peer's info) */ 1892 retval = sctp_process_init(init_cp, stcb); 1893 if (retval < 0) { 1894 if (how_indx < sizeof(asoc->cookie_how)) 1895 asoc->cookie_how[how_indx] = 13; 1896 1897 return (NULL); 1898 } 1899 /* 1900 * since we did not send a HB make sure we don't double 1901 * things 1902 */ 1903 net->hb_responded = 1; 1904 1905 if (sctp_load_addresses_from_init(stcb, m, 1906 init_offset + sizeof(struct sctp_init_chunk), 1907 initack_offset, src, dst, init_src, stcb->asoc.port)) { 1908 if (how_indx < sizeof(asoc->cookie_how)) 1909 asoc->cookie_how[how_indx] = 14; 1910 1911 return (NULL); 1912 } 1913 /* respond with a COOKIE-ACK */ 1914 sctp_stop_all_cookie_timers(stcb); 1915 sctp_toss_old_cookies(stcb, asoc); 1916 sctp_send_cookie_ack(stcb); 1917 if (how_indx < sizeof(asoc->cookie_how)) 1918 asoc->cookie_how[how_indx] = 15; 1919 1920 return (stcb); 1921 } 1922 if (how_indx < sizeof(asoc->cookie_how)) 1923 asoc->cookie_how[how_indx] = 16; 1924 /* all other cases... */ 1925 return (NULL); 1926 } 1927 1928 /* 1929 * handle a state cookie for a new association m: input packet mbuf chain-- 1930 * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf 1931 * and the cookie signature does not exist offset: offset into mbuf to the 1932 * cookie-echo chunk length: length of the cookie chunk to: where the init 1933 * was from returns a new TCB 1934 */ 1935 static struct sctp_tcb * 1936 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1937 struct sockaddr *src, struct sockaddr *dst, 1938 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1939 struct sctp_inpcb *inp, struct sctp_nets **netp, 1940 struct sockaddr *init_src, int *notification, 1941 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1942 uint8_t mflowtype, uint32_t mflowid, 1943 uint32_t vrf_id, uint16_t port) 1944 { 1945 struct sctp_tcb *stcb; 1946 struct sctp_init_chunk *init_cp, init_buf; 1947 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1948 union sctp_sockstore store; 1949 struct sctp_association *asoc; 1950 int init_offset, initack_offset, initack_limit; 1951 int retval; 1952 int error = 0; 1953 uint8_t auth_chunk_buf[SCTP_CHUNK_BUFFER_SIZE]; 1954 1955 /* 1956 * find and validate the INIT chunk in the cookie (peer's info) the 1957 * INIT should start after the cookie-echo header struct (chunk 1958 * header, state cookie header struct) 1959 */ 1960 init_offset = offset + sizeof(struct sctp_cookie_echo_chunk); 1961 init_cp = (struct sctp_init_chunk *) 1962 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 1963 (uint8_t *)&init_buf); 1964 if (init_cp == NULL) { 1965 /* could not pull a INIT chunk in cookie */ 1966 SCTPDBG(SCTP_DEBUG_INPUT1, 1967 "process_cookie_new: could not pull INIT chunk hdr\n"); 1968 return (NULL); 1969 } 1970 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 1971 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n"); 1972 return (NULL); 1973 } 1974 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 1975 /* 1976 * find and validate the INIT-ACK chunk in the cookie (my info) the 1977 * INIT-ACK follows the INIT chunk 1978 */ 1979 initack_cp = (struct sctp_init_ack_chunk *) 1980 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 1981 (uint8_t *)&initack_buf); 1982 if (initack_cp == NULL) { 1983 /* could not pull INIT-ACK chunk in cookie */ 1984 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n"); 1985 return (NULL); 1986 } 1987 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 1988 return (NULL); 1989 } 1990 /* 1991 * NOTE: We can't use the INIT_ACK's chk_length to determine the 1992 * "initack_limit" value. This is because the chk_length field 1993 * includes the length of the cookie, but the cookie is omitted when 1994 * the INIT and INIT_ACK are tacked onto the cookie... 1995 */ 1996 initack_limit = offset + cookie_len; 1997 1998 /* 1999 * now that we know the INIT/INIT-ACK are in place, create a new TCB 2000 * and popluate 2001 */ 2002 2003 /* 2004 * Here we do a trick, we set in NULL for the proc/thread argument. 2005 * We do this since in effect we only use the p argument when the 2006 * socket is unbound and we must do an implicit bind. Since we are 2007 * getting a cookie, we cannot be unbound. 2008 */ 2009 stcb = sctp_aloc_assoc(inp, init_src, &error, 2010 ntohl(initack_cp->init.initiate_tag), vrf_id, 2011 ntohs(initack_cp->init.num_outbound_streams), 2012 port, 2013 (struct thread *)NULL, 2014 SCTP_DONT_INITIALIZE_AUTH_PARAMS); 2015 if (stcb == NULL) { 2016 struct mbuf *op_err; 2017 2018 /* memory problem? */ 2019 SCTPDBG(SCTP_DEBUG_INPUT1, 2020 "process_cookie_new: no room for another TCB!\n"); 2021 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2022 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2023 src, dst, sh, op_err, 2024 mflowtype, mflowid, 2025 vrf_id, port); 2026 return (NULL); 2027 } 2028 asoc = &stcb->asoc; 2029 /* get scope variables out of cookie */ 2030 asoc->scope.ipv4_local_scope = cookie->ipv4_scope; 2031 asoc->scope.site_scope = cookie->site_scope; 2032 asoc->scope.local_scope = cookie->local_scope; 2033 asoc->scope.loopback_scope = cookie->loopback_scope; 2034 2035 if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) || 2036 (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) { 2037 struct mbuf *op_err; 2038 2039 /* 2040 * Houston we have a problem. The EP changed while the 2041 * cookie was in flight. Only recourse is to abort the 2042 * association. 2043 */ 2044 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2045 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2046 src, dst, sh, op_err, 2047 mflowtype, mflowid, 2048 vrf_id, port); 2049 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2050 SCTP_FROM_SCTP_INPUT + SCTP_LOC_18); 2051 return (NULL); 2052 } 2053 /* process the INIT-ACK info (my info) */ 2054 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 2055 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 2056 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 2057 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 2058 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 2059 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 2060 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 2061 asoc->str_reset_seq_in = asoc->init_seq_number; 2062 2063 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 2064 2065 /* process the INIT info (peer's info) */ 2066 retval = sctp_process_init(init_cp, stcb); 2067 if (retval < 0) { 2068 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2069 SCTP_FROM_SCTP_INPUT + SCTP_LOC_19); 2070 return (NULL); 2071 } 2072 /* load all addresses */ 2073 if (sctp_load_addresses_from_init(stcb, m, 2074 init_offset + sizeof(struct sctp_init_chunk), initack_offset, 2075 src, dst, init_src, port)) { 2076 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2077 SCTP_FROM_SCTP_INPUT + SCTP_LOC_20); 2078 return (NULL); 2079 } 2080 /* 2081 * verify any preceding AUTH chunk that was skipped 2082 */ 2083 /* pull the local authentication parameters from the cookie/init-ack */ 2084 sctp_auth_get_cookie_params(stcb, m, 2085 initack_offset + sizeof(struct sctp_init_ack_chunk), 2086 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk))); 2087 if (auth_skipped) { 2088 struct sctp_auth_chunk *auth; 2089 2090 if (auth_len <= SCTP_CHUNK_BUFFER_SIZE) { 2091 auth = (struct sctp_auth_chunk *)sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf); 2092 } else { 2093 auth = NULL; 2094 } 2095 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) { 2096 /* auth HMAC failed, dump the assoc and packet */ 2097 SCTPDBG(SCTP_DEBUG_AUTH1, 2098 "COOKIE-ECHO: AUTH failed\n"); 2099 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2100 SCTP_FROM_SCTP_INPUT + SCTP_LOC_21); 2101 return (NULL); 2102 } else { 2103 /* remaining chunks checked... good to go */ 2104 stcb->asoc.authenticated = 1; 2105 } 2106 } 2107 2108 /* 2109 * if we're doing ASCONFs, check to see if we have any new local 2110 * addresses that need to get added to the peer (eg. addresses 2111 * changed while cookie echo in flight). This needs to be done 2112 * after we go to the OPEN state to do the correct asconf 2113 * processing. else, make sure we have the correct addresses in our 2114 * lists 2115 */ 2116 2117 /* warning, we re-use sin, sin6, sa_store here! */ 2118 /* pull in local_address (our "from" address) */ 2119 switch (cookie->laddr_type) { 2120 #ifdef INET 2121 case SCTP_IPV4_ADDRESS: 2122 /* source addr is IPv4 */ 2123 memset(&store.sin, 0, sizeof(struct sockaddr_in)); 2124 store.sin.sin_family = AF_INET; 2125 store.sin.sin_len = sizeof(struct sockaddr_in); 2126 store.sin.sin_addr.s_addr = cookie->laddress[0]; 2127 break; 2128 #endif 2129 #ifdef INET6 2130 case SCTP_IPV6_ADDRESS: 2131 /* source addr is IPv6 */ 2132 memset(&store.sin6, 0, sizeof(struct sockaddr_in6)); 2133 store.sin6.sin6_family = AF_INET6; 2134 store.sin6.sin6_len = sizeof(struct sockaddr_in6); 2135 store.sin6.sin6_scope_id = cookie->scope_id; 2136 memcpy(&store.sin6.sin6_addr, cookie->laddress, sizeof(struct in6_addr)); 2137 break; 2138 #endif 2139 default: 2140 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2141 SCTP_FROM_SCTP_INPUT + SCTP_LOC_22); 2142 return (NULL); 2143 } 2144 2145 /* update current state */ 2146 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2147 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 2148 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2149 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2150 stcb->sctp_ep, stcb, NULL); 2151 } 2152 sctp_stop_all_cookie_timers(stcb); 2153 SCTP_STAT_INCR_COUNTER32(sctps_passiveestab); 2154 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2155 2156 /* set up to notify upper layer */ 2157 *notification = SCTP_NOTIFY_ASSOC_UP; 2158 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2159 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 2160 (!SCTP_IS_LISTENING(inp))) { 2161 /* 2162 * This is an endpoint that called connect() how it got a 2163 * cookie that is NEW is a bit of a mystery. It must be that 2164 * the INIT was sent, but before it got there.. a complete 2165 * INIT/INIT-ACK/COOKIE arrived. But of course then it 2166 * should have went to the other code.. not here.. oh well.. 2167 * a bit of protection is worth having.. 2168 */ 2169 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2170 soisconnected(stcb->sctp_socket); 2171 } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 2172 (SCTP_IS_LISTENING(inp))) { 2173 /* 2174 * We don't want to do anything with this one. Since it is 2175 * the listening guy. The timer will get started for 2176 * accepted connections in the caller. 2177 */ 2178 ; 2179 } 2180 if (stcb->asoc.sctp_autoclose_ticks && 2181 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2182 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL); 2183 } 2184 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 2185 *netp = sctp_findnet(stcb, init_src); 2186 if (*netp != NULL) { 2187 struct timeval old; 2188 2189 /* 2190 * Since we did not send a HB, make sure we don't double 2191 * things. 2192 */ 2193 (*netp)->hb_responded = 1; 2194 /* Calculate the RTT. */ 2195 old.tv_sec = cookie->time_entered.tv_sec; 2196 old.tv_usec = cookie->time_entered.tv_usec; 2197 sctp_calculate_rto(stcb, asoc, *netp, &old, SCTP_RTT_FROM_NON_DATA); 2198 } 2199 /* respond with a COOKIE-ACK */ 2200 sctp_send_cookie_ack(stcb); 2201 2202 /* 2203 * check the address lists for any ASCONFs that need to be sent 2204 * AFTER the cookie-ack is sent 2205 */ 2206 sctp_check_address_list(stcb, m, 2207 initack_offset + sizeof(struct sctp_init_ack_chunk), 2208 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)), 2209 &store.sa, cookie->local_scope, cookie->site_scope, 2210 cookie->ipv4_scope, cookie->loopback_scope); 2211 2212 return (stcb); 2213 } 2214 2215 /* 2216 * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e 2217 * we NEED to make sure we are not already using the vtag. If so we 2218 * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit! 2219 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag, 2220 SCTP_BASE_INFO(hashasocmark))]; 2221 LIST_FOREACH(stcb, head, sctp_asocs) { 2222 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep)) { 2223 -- SEND ABORT - TRY AGAIN -- 2224 } 2225 } 2226 */ 2227 2228 /* 2229 * handles a COOKIE-ECHO message stcb: modified to either a new or left as 2230 * existing (non-NULL) TCB 2231 */ 2232 static struct mbuf * 2233 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset, 2234 struct sockaddr *src, struct sockaddr *dst, 2235 struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp, 2236 struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp, 2237 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2238 struct sctp_tcb **locked_tcb, 2239 uint8_t mflowtype, uint32_t mflowid, 2240 uint32_t vrf_id, uint16_t port) 2241 { 2242 struct sctp_state_cookie *cookie; 2243 struct sctp_tcb *l_stcb = *stcb; 2244 struct sctp_inpcb *l_inp; 2245 struct sockaddr *to; 2246 struct sctp_pcb *ep; 2247 struct mbuf *m_sig; 2248 uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE]; 2249 uint8_t *sig; 2250 uint8_t cookie_ok = 0; 2251 unsigned int sig_offset, cookie_offset; 2252 unsigned int cookie_len; 2253 struct timeval now; 2254 struct timeval time_entered, time_expires; 2255 int notification = 0; 2256 struct sctp_nets *netl; 2257 int had_a_existing_tcb = 0; 2258 int send_int_conf = 0; 2259 #ifdef INET 2260 struct sockaddr_in sin; 2261 #endif 2262 #ifdef INET6 2263 struct sockaddr_in6 sin6; 2264 #endif 2265 2266 SCTPDBG(SCTP_DEBUG_INPUT2, 2267 "sctp_handle_cookie: handling COOKIE-ECHO\n"); 2268 2269 if (inp_p == NULL) { 2270 return (NULL); 2271 } 2272 cookie = &cp->cookie; 2273 cookie_offset = offset + sizeof(struct sctp_chunkhdr); 2274 cookie_len = ntohs(cp->ch.chunk_length); 2275 2276 if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) + 2277 sizeof(struct sctp_init_chunk) + 2278 sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) { 2279 /* cookie too small */ 2280 return (NULL); 2281 } 2282 if ((cookie->peerport != sh->src_port) || 2283 (cookie->myport != sh->dest_port) || 2284 (cookie->my_vtag != sh->v_tag)) { 2285 /* 2286 * invalid ports or bad tag. Note that we always leave the 2287 * v_tag in the header in network order and when we stored 2288 * it in the my_vtag slot we also left it in network order. 2289 * This maintains the match even though it may be in the 2290 * opposite byte order of the machine :-> 2291 */ 2292 return (NULL); 2293 } 2294 /* 2295 * split off the signature into its own mbuf (since it should not be 2296 * calculated in the sctp_hmac_m() call). 2297 */ 2298 sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE; 2299 m_sig = m_split(m, sig_offset, M_NOWAIT); 2300 if (m_sig == NULL) { 2301 /* out of memory or ?? */ 2302 return (NULL); 2303 } 2304 #ifdef SCTP_MBUF_LOGGING 2305 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 2306 sctp_log_mbc(m_sig, SCTP_MBUF_SPLIT); 2307 } 2308 #endif 2309 2310 /* 2311 * compute the signature/digest for the cookie 2312 */ 2313 ep = &(*inp_p)->sctp_ep; 2314 l_inp = *inp_p; 2315 if (l_stcb) { 2316 SCTP_TCB_UNLOCK(l_stcb); 2317 } 2318 SCTP_INP_RLOCK(l_inp); 2319 if (l_stcb) { 2320 SCTP_TCB_LOCK(l_stcb); 2321 } 2322 /* which cookie is it? */ 2323 if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) && 2324 (ep->current_secret_number != ep->last_secret_number)) { 2325 /* it's the old cookie */ 2326 (void)sctp_hmac_m(SCTP_HMAC, 2327 (uint8_t *)ep->secret_key[(int)ep->last_secret_number], 2328 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2329 } else { 2330 /* it's the current cookie */ 2331 (void)sctp_hmac_m(SCTP_HMAC, 2332 (uint8_t *)ep->secret_key[(int)ep->current_secret_number], 2333 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2334 } 2335 /* get the signature */ 2336 SCTP_INP_RUNLOCK(l_inp); 2337 sig = (uint8_t *)sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *)&tmp_sig); 2338 if (sig == NULL) { 2339 /* couldn't find signature */ 2340 sctp_m_freem(m_sig); 2341 return (NULL); 2342 } 2343 /* compare the received digest with the computed digest */ 2344 if (timingsafe_bcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) { 2345 /* try the old cookie? */ 2346 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) && 2347 (ep->current_secret_number != ep->last_secret_number)) { 2348 /* compute digest with old */ 2349 (void)sctp_hmac_m(SCTP_HMAC, 2350 (uint8_t *)ep->secret_key[(int)ep->last_secret_number], 2351 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2352 /* compare */ 2353 if (timingsafe_bcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0) 2354 cookie_ok = 1; 2355 } 2356 } else { 2357 cookie_ok = 1; 2358 } 2359 2360 /* 2361 * Now before we continue we must reconstruct our mbuf so that 2362 * normal processing of any other chunks will work. 2363 */ 2364 { 2365 struct mbuf *m_at; 2366 2367 m_at = m; 2368 while (SCTP_BUF_NEXT(m_at) != NULL) { 2369 m_at = SCTP_BUF_NEXT(m_at); 2370 } 2371 SCTP_BUF_NEXT(m_at) = m_sig; 2372 } 2373 2374 if (cookie_ok == 0) { 2375 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n"); 2376 SCTPDBG(SCTP_DEBUG_INPUT2, 2377 "offset = %u, cookie_offset = %u, sig_offset = %u\n", 2378 (uint32_t)offset, cookie_offset, sig_offset); 2379 return (NULL); 2380 } 2381 2382 if (sctp_ticks_to_msecs(cookie->cookie_life) > SCTP_MAX_COOKIE_LIFE) { 2383 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: Invalid cookie lifetime\n"); 2384 return (NULL); 2385 } 2386 time_entered.tv_sec = cookie->time_entered.tv_sec; 2387 time_entered.tv_usec = cookie->time_entered.tv_usec; 2388 if ((time_entered.tv_sec < 0) || 2389 (time_entered.tv_usec < 0) || 2390 (time_entered.tv_usec >= 1000000)) { 2391 /* Invalid time stamp. Cookie must have been modified. */ 2392 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: Invalid time stamp\n"); 2393 return (NULL); 2394 } 2395 (void)SCTP_GETTIME_TIMEVAL(&now); 2396 if (timevalcmp(&now, &time_entered, <)) { 2397 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie generated in the future!\n"); 2398 return (NULL); 2399 } 2400 /* 2401 * Check the cookie timestamps to be sure it's not stale. 2402 * cookie_life is in ticks, so we convert to seconds. 2403 */ 2404 time_expires.tv_sec = time_entered.tv_sec + sctp_ticks_to_secs(cookie->cookie_life); 2405 time_expires.tv_usec = time_entered.tv_usec; 2406 if (timevalcmp(&now, &time_expires, >)) { 2407 /* cookie is stale! */ 2408 struct mbuf *op_err; 2409 struct sctp_error_stale_cookie *cause; 2410 struct timeval diff; 2411 uint32_t staleness; 2412 2413 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_error_stale_cookie), 2414 0, M_NOWAIT, 1, MT_DATA); 2415 if (op_err == NULL) { 2416 /* FOOBAR */ 2417 return (NULL); 2418 } 2419 /* Set the len */ 2420 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_error_stale_cookie); 2421 cause = mtod(op_err, struct sctp_error_stale_cookie *); 2422 cause->cause.code = htons(SCTP_CAUSE_STALE_COOKIE); 2423 cause->cause.length = htons(sizeof(struct sctp_error_stale_cookie)); 2424 diff = now; 2425 timevalsub(&diff, &time_expires); 2426 if ((uint32_t)diff.tv_sec > UINT32_MAX / 1000000) { 2427 staleness = UINT32_MAX; 2428 } else { 2429 staleness = diff.tv_sec * 1000000; 2430 } 2431 if (UINT32_MAX - staleness >= (uint32_t)diff.tv_usec) { 2432 staleness += diff.tv_usec; 2433 } else { 2434 staleness = UINT32_MAX; 2435 } 2436 cause->stale_time = htonl(staleness); 2437 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 2438 mflowtype, mflowid, l_inp->fibnum, 2439 vrf_id, port); 2440 return (NULL); 2441 } 2442 /* 2443 * Now we must see with the lookup address if we have an existing 2444 * asoc. This will only happen if we were in the COOKIE-WAIT state 2445 * and a INIT collided with us and somewhere the peer sent the 2446 * cookie on another address besides the single address our assoc 2447 * had for him. In this case we will have one of the tie-tags set at 2448 * least AND the address field in the cookie can be used to look it 2449 * up. 2450 */ 2451 to = NULL; 2452 switch (cookie->addr_type) { 2453 #ifdef INET6 2454 case SCTP_IPV6_ADDRESS: 2455 memset(&sin6, 0, sizeof(sin6)); 2456 sin6.sin6_family = AF_INET6; 2457 sin6.sin6_len = sizeof(sin6); 2458 sin6.sin6_port = sh->src_port; 2459 sin6.sin6_scope_id = cookie->scope_id; 2460 memcpy(&sin6.sin6_addr.s6_addr, cookie->address, 2461 sizeof(sin6.sin6_addr.s6_addr)); 2462 to = (struct sockaddr *)&sin6; 2463 break; 2464 #endif 2465 #ifdef INET 2466 case SCTP_IPV4_ADDRESS: 2467 memset(&sin, 0, sizeof(sin)); 2468 sin.sin_family = AF_INET; 2469 sin.sin_len = sizeof(sin); 2470 sin.sin_port = sh->src_port; 2471 sin.sin_addr.s_addr = cookie->address[0]; 2472 to = (struct sockaddr *)&sin; 2473 break; 2474 #endif 2475 default: 2476 /* This should not happen */ 2477 return (NULL); 2478 } 2479 if (*stcb == NULL) { 2480 /* Yep, lets check */ 2481 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL); 2482 if (*stcb == NULL) { 2483 /* 2484 * We should have only got back the same inp. If we 2485 * got back a different ep we have a problem. The 2486 * original findep got back l_inp and now 2487 */ 2488 if (l_inp != *inp_p) { 2489 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n"); 2490 } 2491 } else { 2492 if (*locked_tcb == NULL) { 2493 /* 2494 * In this case we found the assoc only 2495 * after we locked the create lock. This 2496 * means we are in a colliding case and we 2497 * must make sure that we unlock the tcb if 2498 * its one of the cases where we throw away 2499 * the incoming packets. 2500 */ 2501 *locked_tcb = *stcb; 2502 2503 /* 2504 * We must also increment the inp ref count 2505 * since the ref_count flags was set when we 2506 * did not find the TCB, now we found it 2507 * which reduces the refcount.. we must 2508 * raise it back out to balance it all :-) 2509 */ 2510 SCTP_INP_INCR_REF((*stcb)->sctp_ep); 2511 if ((*stcb)->sctp_ep != l_inp) { 2512 SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n", 2513 (void *)(*stcb)->sctp_ep, (void *)l_inp); 2514 } 2515 } 2516 } 2517 } 2518 2519 cookie_len -= SCTP_SIGNATURE_SIZE; 2520 if (*stcb == NULL) { 2521 /* this is the "normal" case... get a new TCB */ 2522 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh, 2523 cookie, cookie_len, *inp_p, 2524 netp, to, ¬ification, 2525 auth_skipped, auth_offset, auth_len, 2526 mflowtype, mflowid, 2527 vrf_id, port); 2528 } else { 2529 /* this is abnormal... cookie-echo on existing TCB */ 2530 had_a_existing_tcb = 1; 2531 *stcb = sctp_process_cookie_existing(m, iphlen, offset, 2532 src, dst, sh, 2533 cookie, cookie_len, *inp_p, *stcb, netp, to, 2534 ¬ification, auth_skipped, auth_offset, auth_len, 2535 mflowtype, mflowid, 2536 vrf_id, port); 2537 } 2538 2539 if (*stcb == NULL) { 2540 /* still no TCB... must be bad cookie-echo */ 2541 return (NULL); 2542 } 2543 if (*netp != NULL) { 2544 (*netp)->flowtype = mflowtype; 2545 (*netp)->flowid = mflowid; 2546 } 2547 /* 2548 * Ok, we built an association so confirm the address we sent the 2549 * INIT-ACK to. 2550 */ 2551 netl = sctp_findnet(*stcb, to); 2552 /* 2553 * This code should in theory NOT run but 2554 */ 2555 if (netl == NULL) { 2556 /* TSNH! Huh, why do I need to add this address here? */ 2557 if (sctp_add_remote_addr(*stcb, to, NULL, port, 2558 SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) { 2559 return (NULL); 2560 } 2561 netl = sctp_findnet(*stcb, to); 2562 } 2563 if (netl) { 2564 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) { 2565 netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 2566 (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL, 2567 netl); 2568 send_int_conf = 1; 2569 } 2570 } 2571 sctp_start_net_timers(*stcb); 2572 if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) { 2573 if (!had_a_existing_tcb || 2574 (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) { 2575 /* 2576 * If we have a NEW cookie or the connect never 2577 * reached the connected state during collision we 2578 * must do the TCP accept thing. 2579 */ 2580 struct socket *so, *oso; 2581 struct sctp_inpcb *inp; 2582 2583 if (notification == SCTP_NOTIFY_ASSOC_RESTART) { 2584 /* 2585 * For a restart we will keep the same 2586 * socket, no need to do anything. I THINK!! 2587 */ 2588 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2589 if (send_int_conf) { 2590 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2591 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2592 } 2593 return (m); 2594 } 2595 oso = (*inp_p)->sctp_socket; 2596 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2597 SCTP_TCB_UNLOCK((*stcb)); 2598 CURVNET_SET(oso->so_vnet); 2599 so = sonewconn(oso, 0 2600 ); 2601 CURVNET_RESTORE(); 2602 SCTP_TCB_LOCK((*stcb)); 2603 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2604 2605 if (so == NULL) { 2606 struct mbuf *op_err; 2607 2608 /* Too many sockets */ 2609 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n"); 2610 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2611 sctp_abort_association(*inp_p, NULL, m, iphlen, 2612 src, dst, sh, op_err, 2613 mflowtype, mflowid, 2614 vrf_id, port); 2615 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, 2616 SCTP_FROM_SCTP_INPUT + SCTP_LOC_23); 2617 return (NULL); 2618 } 2619 inp = (struct sctp_inpcb *)so->so_pcb; 2620 SCTP_INP_INCR_REF(inp); 2621 /* 2622 * We add the unbound flag here so that if we get an 2623 * soabort() before we get the move_pcb done, we 2624 * will properly cleanup. 2625 */ 2626 inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE | 2627 SCTP_PCB_FLAGS_CONNECTED | 2628 SCTP_PCB_FLAGS_IN_TCPPOOL | 2629 SCTP_PCB_FLAGS_UNBOUND | 2630 (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) | 2631 SCTP_PCB_FLAGS_DONT_WAKE); 2632 inp->sctp_features = (*inp_p)->sctp_features; 2633 inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features; 2634 inp->sctp_socket = so; 2635 inp->sctp_frag_point = (*inp_p)->sctp_frag_point; 2636 inp->max_cwnd = (*inp_p)->max_cwnd; 2637 inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off; 2638 inp->ecn_supported = (*inp_p)->ecn_supported; 2639 inp->prsctp_supported = (*inp_p)->prsctp_supported; 2640 inp->auth_supported = (*inp_p)->auth_supported; 2641 inp->asconf_supported = (*inp_p)->asconf_supported; 2642 inp->reconfig_supported = (*inp_p)->reconfig_supported; 2643 inp->nrsack_supported = (*inp_p)->nrsack_supported; 2644 inp->pktdrop_supported = (*inp_p)->pktdrop_supported; 2645 inp->partial_delivery_point = (*inp_p)->partial_delivery_point; 2646 inp->sctp_context = (*inp_p)->sctp_context; 2647 inp->local_strreset_support = (*inp_p)->local_strreset_support; 2648 inp->fibnum = (*inp_p)->fibnum; 2649 inp->inp_starting_point_for_iterator = NULL; 2650 /* 2651 * copy in the authentication parameters from the 2652 * original endpoint 2653 */ 2654 if (inp->sctp_ep.local_hmacs) 2655 sctp_free_hmaclist(inp->sctp_ep.local_hmacs); 2656 inp->sctp_ep.local_hmacs = 2657 sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs); 2658 if (inp->sctp_ep.local_auth_chunks) 2659 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks); 2660 inp->sctp_ep.local_auth_chunks = 2661 sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks); 2662 2663 /* 2664 * Now we must move it from one hash table to 2665 * another and get the tcb in the right place. 2666 */ 2667 2668 /* 2669 * This is where the one-2-one socket is put into 2670 * the accept state waiting for the accept! 2671 */ 2672 if (*stcb) { 2673 SCTP_ADD_SUBSTATE(*stcb, SCTP_STATE_IN_ACCEPT_QUEUE); 2674 } 2675 sctp_move_pcb_and_assoc(*inp_p, inp, *stcb); 2676 2677 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2678 SCTP_TCB_UNLOCK((*stcb)); 2679 2680 sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb, 2681 0); 2682 SCTP_TCB_LOCK((*stcb)); 2683 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2684 2685 /* 2686 * now we must check to see if we were aborted while 2687 * the move was going on and the lock/unlock 2688 * happened. 2689 */ 2690 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 2691 /* 2692 * yep it was, we leave the assoc attached 2693 * to the socket since the sctp_inpcb_free() 2694 * call will send an abort for us. 2695 */ 2696 SCTP_INP_DECR_REF(inp); 2697 return (NULL); 2698 } 2699 SCTP_INP_DECR_REF(inp); 2700 /* Switch over to the new guy */ 2701 *inp_p = inp; 2702 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2703 if (send_int_conf) { 2704 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2705 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2706 } 2707 2708 /* 2709 * Pull it from the incomplete queue and wake the 2710 * guy 2711 */ 2712 soisconnected(so); 2713 return (m); 2714 } 2715 } 2716 if (notification) { 2717 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2718 } 2719 if (send_int_conf) { 2720 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2721 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2722 } 2723 return (m); 2724 } 2725 2726 static void 2727 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED, 2728 struct sctp_tcb *stcb, struct sctp_nets *net) 2729 { 2730 /* cp must not be used, others call this without a c-ack :-) */ 2731 struct sctp_association *asoc; 2732 struct sctp_tmit_chunk *chk; 2733 2734 SCTPDBG(SCTP_DEBUG_INPUT2, 2735 "sctp_handle_cookie_ack: handling COOKIE-ACK\n"); 2736 if ((stcb == NULL) || (net == NULL)) { 2737 return; 2738 } 2739 2740 asoc = &stcb->asoc; 2741 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 2742 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 2743 asoc->overall_error_count, 2744 0, 2745 SCTP_FROM_SCTP_INPUT, 2746 __LINE__); 2747 } 2748 asoc->overall_error_count = 0; 2749 sctp_stop_all_cookie_timers(stcb); 2750 /* process according to association state */ 2751 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) { 2752 /* state change only needed when I am in right state */ 2753 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2754 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 2755 sctp_start_net_timers(stcb); 2756 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2757 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2758 stcb->sctp_ep, stcb, NULL); 2759 } 2760 /* update RTO */ 2761 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 2762 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2763 if (asoc->overall_error_count == 0) { 2764 sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, 2765 SCTP_RTT_FROM_NON_DATA); 2766 } 2767 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 2768 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2769 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2770 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 2771 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2772 if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) { 2773 soisconnected(stcb->sctp_socket); 2774 } 2775 } 2776 /* 2777 * since we did not send a HB make sure we don't double 2778 * things 2779 */ 2780 net->hb_responded = 1; 2781 2782 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2783 /* 2784 * We don't need to do the asconf thing, nor hb or 2785 * autoclose if the socket is closed. 2786 */ 2787 goto closed_socket; 2788 } 2789 2790 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 2791 stcb, net); 2792 2793 if (stcb->asoc.sctp_autoclose_ticks && 2794 sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2795 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 2796 stcb->sctp_ep, stcb, NULL); 2797 } 2798 /* 2799 * send ASCONF if parameters are pending and ASCONFs are 2800 * allowed (eg. addresses changed when init/cookie echo were 2801 * in flight) 2802 */ 2803 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) && 2804 (stcb->asoc.asconf_supported == 1) && 2805 (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) { 2806 #ifdef SCTP_TIMER_BASED_ASCONF 2807 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, 2808 stcb->sctp_ep, stcb, 2809 stcb->asoc.primary_destination); 2810 #else 2811 sctp_send_asconf(stcb, stcb->asoc.primary_destination, 2812 SCTP_ADDR_NOT_LOCKED); 2813 #endif 2814 } 2815 } 2816 closed_socket: 2817 /* Toss the cookie if I can */ 2818 sctp_toss_old_cookies(stcb, asoc); 2819 /* Restart the timer if we have pending data */ 2820 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) { 2821 if (chk->whoTo != NULL) { 2822 break; 2823 } 2824 } 2825 if (chk != NULL) { 2826 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 2827 } 2828 } 2829 2830 static void 2831 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp, 2832 struct sctp_tcb *stcb) 2833 { 2834 struct sctp_nets *net; 2835 struct sctp_tmit_chunk *lchk; 2836 struct sctp_ecne_chunk bkup; 2837 uint8_t override_bit; 2838 uint32_t tsn, window_data_tsn; 2839 int len; 2840 unsigned int pkt_cnt; 2841 2842 len = ntohs(cp->ch.chunk_length); 2843 if ((len != sizeof(struct sctp_ecne_chunk)) && 2844 (len != sizeof(struct old_sctp_ecne_chunk))) { 2845 return; 2846 } 2847 if (len == sizeof(struct old_sctp_ecne_chunk)) { 2848 /* Its the old format */ 2849 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk)); 2850 bkup.num_pkts_since_cwr = htonl(1); 2851 cp = &bkup; 2852 } 2853 SCTP_STAT_INCR(sctps_recvecne); 2854 tsn = ntohl(cp->tsn); 2855 pkt_cnt = ntohl(cp->num_pkts_since_cwr); 2856 lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead); 2857 if (lchk == NULL) { 2858 window_data_tsn = stcb->asoc.sending_seq - 1; 2859 } else { 2860 window_data_tsn = lchk->rec.data.tsn; 2861 } 2862 2863 /* Find where it was sent to if possible. */ 2864 net = NULL; 2865 TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) { 2866 if (lchk->rec.data.tsn == tsn) { 2867 net = lchk->whoTo; 2868 net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send; 2869 break; 2870 } 2871 if (SCTP_TSN_GT(lchk->rec.data.tsn, tsn)) { 2872 break; 2873 } 2874 } 2875 if (net == NULL) { 2876 /* 2877 * What to do. A previous send of a CWR was possibly lost. 2878 * See how old it is, we may have it marked on the actual 2879 * net. 2880 */ 2881 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 2882 if (tsn == net->last_cwr_tsn) { 2883 /* Found him, send it off */ 2884 break; 2885 } 2886 } 2887 if (net == NULL) { 2888 /* 2889 * If we reach here, we need to send a special CWR 2890 * that says hey, we did this a long time ago and 2891 * you lost the response. 2892 */ 2893 net = TAILQ_FIRST(&stcb->asoc.nets); 2894 if (net == NULL) { 2895 /* TSNH */ 2896 return; 2897 } 2898 override_bit = SCTP_CWR_REDUCE_OVERRIDE; 2899 } else { 2900 override_bit = 0; 2901 } 2902 } else { 2903 override_bit = 0; 2904 } 2905 if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) && 2906 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 2907 /* 2908 * JRS - Use the congestion control given in the pluggable 2909 * CC module 2910 */ 2911 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt); 2912 /* 2913 * We reduce once every RTT. So we will only lower cwnd at 2914 * the next sending seq i.e. the window_data_tsn 2915 */ 2916 net->cwr_window_tsn = window_data_tsn; 2917 net->ecn_ce_pkt_cnt += pkt_cnt; 2918 net->lost_cnt = pkt_cnt; 2919 net->last_cwr_tsn = tsn; 2920 } else { 2921 override_bit |= SCTP_CWR_IN_SAME_WINDOW; 2922 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) && 2923 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 2924 /* 2925 * Another loss in the same window update how many 2926 * marks/packets lost we have had. 2927 */ 2928 int cnt = 1; 2929 2930 if (pkt_cnt > net->lost_cnt) { 2931 /* Should be the case */ 2932 cnt = (pkt_cnt - net->lost_cnt); 2933 net->ecn_ce_pkt_cnt += cnt; 2934 } 2935 net->lost_cnt = pkt_cnt; 2936 net->last_cwr_tsn = tsn; 2937 /* 2938 * Most CC functions will ignore this call, since we 2939 * are in-window yet of the initial CE the peer saw. 2940 */ 2941 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt); 2942 } 2943 } 2944 /* 2945 * We always send a CWR this way if our previous one was lost our 2946 * peer will get an update, or if it is not time again to reduce we 2947 * still get the cwr to the peer. Note we set the override when we 2948 * could not find the TSN on the chunk or the destination network. 2949 */ 2950 sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit); 2951 } 2952 2953 static void 2954 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net) 2955 { 2956 /* 2957 * Here we get a CWR from the peer. We must look in the outqueue and 2958 * make sure that we have a covered ECNE in the control chunk part. 2959 * If so remove it. 2960 */ 2961 struct sctp_tmit_chunk *chk, *nchk; 2962 struct sctp_ecne_chunk *ecne; 2963 int override; 2964 uint32_t cwr_tsn; 2965 2966 cwr_tsn = ntohl(cp->tsn); 2967 override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE; 2968 TAILQ_FOREACH_SAFE(chk, &stcb->asoc.control_send_queue, sctp_next, nchk) { 2969 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) { 2970 continue; 2971 } 2972 if ((override == 0) && (chk->whoTo != net)) { 2973 /* Must be from the right src unless override is set */ 2974 continue; 2975 } 2976 ecne = mtod(chk->data, struct sctp_ecne_chunk *); 2977 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) { 2978 /* this covers this ECNE, we can remove it */ 2979 stcb->asoc.ecn_echo_cnt_onq--; 2980 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, 2981 sctp_next); 2982 stcb->asoc.ctrl_queue_cnt--; 2983 sctp_m_freem(chk->data); 2984 chk->data = NULL; 2985 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 2986 if (override == 0) { 2987 break; 2988 } 2989 } 2990 } 2991 } 2992 2993 static void 2994 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED, 2995 struct sctp_tcb *stcb, struct sctp_nets *net) 2996 { 2997 2998 SCTPDBG(SCTP_DEBUG_INPUT2, 2999 "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n"); 3000 if (stcb == NULL) 3001 return; 3002 3003 /* process according to association state */ 3004 if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 3005 /* unexpected SHUTDOWN-COMPLETE... so ignore... */ 3006 SCTPDBG(SCTP_DEBUG_INPUT2, 3007 "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n"); 3008 SCTP_TCB_UNLOCK(stcb); 3009 return; 3010 } 3011 /* notify upper layer protocol */ 3012 if (stcb->sctp_socket) { 3013 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 3014 } 3015 #ifdef INVARIANTS 3016 if (!TAILQ_EMPTY(&stcb->asoc.send_queue) || 3017 !TAILQ_EMPTY(&stcb->asoc.sent_queue) || 3018 sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) { 3019 panic("Queues are not empty when handling SHUTDOWN-COMPLETE"); 3020 } 3021 #endif 3022 /* stop the timer */ 3023 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, 3024 SCTP_FROM_SCTP_INPUT + SCTP_LOC_24); 3025 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 3026 /* free the TCB */ 3027 SCTPDBG(SCTP_DEBUG_INPUT2, 3028 "sctp_handle_shutdown_complete: calls free-asoc\n"); 3029 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 3030 SCTP_FROM_SCTP_INPUT + SCTP_LOC_25); 3031 return; 3032 } 3033 3034 static int 3035 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc, 3036 struct sctp_nets *net, uint8_t flg) 3037 { 3038 switch (desc->chunk_type) { 3039 case SCTP_DATA: 3040 case SCTP_IDATA: 3041 /* find the tsn to resend (possibly) */ 3042 { 3043 uint32_t tsn; 3044 struct sctp_tmit_chunk *tp1; 3045 3046 tsn = ntohl(desc->tsn_ifany); 3047 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3048 if (tp1->rec.data.tsn == tsn) { 3049 /* found it */ 3050 break; 3051 } 3052 if (SCTP_TSN_GT(tp1->rec.data.tsn, tsn)) { 3053 /* not found */ 3054 tp1 = NULL; 3055 break; 3056 } 3057 } 3058 if (tp1 == NULL) { 3059 /* 3060 * Do it the other way , aka without paying 3061 * attention to queue seq order. 3062 */ 3063 SCTP_STAT_INCR(sctps_pdrpdnfnd); 3064 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3065 if (tp1->rec.data.tsn == tsn) { 3066 /* found it */ 3067 break; 3068 } 3069 } 3070 } 3071 if (tp1 == NULL) { 3072 SCTP_STAT_INCR(sctps_pdrptsnnf); 3073 } 3074 if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) { 3075 if (((flg & SCTP_BADCRC) == 0) && 3076 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3077 return (0); 3078 } 3079 if ((stcb->asoc.peers_rwnd == 0) && 3080 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3081 SCTP_STAT_INCR(sctps_pdrpdiwnp); 3082 return (0); 3083 } 3084 if (stcb->asoc.peers_rwnd == 0 && 3085 (flg & SCTP_FROM_MIDDLE_BOX)) { 3086 SCTP_STAT_INCR(sctps_pdrpdizrw); 3087 return (0); 3088 } 3089 if ((uint32_t)SCTP_BUF_LEN(tp1->data) < 3090 SCTP_DATA_CHUNK_OVERHEAD(stcb) + SCTP_NUM_DB_TO_VERIFY) { 3091 /* Payload not matching. */ 3092 SCTP_STAT_INCR(sctps_pdrpbadd); 3093 return (-1); 3094 } 3095 if (memcmp(mtod(tp1->data, caddr_t)+SCTP_DATA_CHUNK_OVERHEAD(stcb), 3096 desc->data_bytes, SCTP_NUM_DB_TO_VERIFY) != 0) { 3097 /* Payload not matching. */ 3098 SCTP_STAT_INCR(sctps_pdrpbadd); 3099 return (-1); 3100 } 3101 if (tp1->do_rtt) { 3102 /* 3103 * this guy had a RTO calculation 3104 * pending on it, cancel it 3105 */ 3106 if (tp1->whoTo->rto_needed == 0) { 3107 tp1->whoTo->rto_needed = 1; 3108 } 3109 tp1->do_rtt = 0; 3110 } 3111 SCTP_STAT_INCR(sctps_pdrpmark); 3112 if (tp1->sent != SCTP_DATAGRAM_RESEND) 3113 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3114 /* 3115 * mark it as if we were doing a FR, since 3116 * we will be getting gap ack reports behind 3117 * the info from the router. 3118 */ 3119 tp1->rec.data.doing_fast_retransmit = 1; 3120 /* 3121 * mark the tsn with what sequences can 3122 * cause a new FR. 3123 */ 3124 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) { 3125 tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq; 3126 } else { 3127 tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.tsn; 3128 } 3129 3130 /* restart the timer */ 3131 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3132 stcb, tp1->whoTo, 3133 SCTP_FROM_SCTP_INPUT + SCTP_LOC_26); 3134 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3135 stcb, tp1->whoTo); 3136 3137 /* fix counts and things */ 3138 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 3139 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP, 3140 tp1->whoTo->flight_size, 3141 tp1->book_size, 3142 (uint32_t)(uintptr_t)stcb, 3143 tp1->rec.data.tsn); 3144 } 3145 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3146 sctp_flight_size_decrease(tp1); 3147 sctp_total_flight_decrease(stcb, tp1); 3148 } 3149 tp1->sent = SCTP_DATAGRAM_RESEND; 3150 } { 3151 /* audit code */ 3152 unsigned int audit; 3153 3154 audit = 0; 3155 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3156 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3157 audit++; 3158 } 3159 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue, 3160 sctp_next) { 3161 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3162 audit++; 3163 } 3164 if (audit != stcb->asoc.sent_queue_retran_cnt) { 3165 SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n", 3166 audit, stcb->asoc.sent_queue_retran_cnt); 3167 #ifndef SCTP_AUDITING_ENABLED 3168 stcb->asoc.sent_queue_retran_cnt = audit; 3169 #endif 3170 } 3171 } 3172 } 3173 break; 3174 case SCTP_ASCONF: 3175 { 3176 struct sctp_tmit_chunk *asconf; 3177 3178 TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue, 3179 sctp_next) { 3180 if (asconf->rec.chunk_id.id == SCTP_ASCONF) { 3181 break; 3182 } 3183 } 3184 if (asconf) { 3185 if (asconf->sent != SCTP_DATAGRAM_RESEND) 3186 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3187 asconf->sent = SCTP_DATAGRAM_RESEND; 3188 asconf->snd_count--; 3189 } 3190 } 3191 break; 3192 case SCTP_INITIATION: 3193 /* resend the INIT */ 3194 stcb->asoc.dropped_special_cnt++; 3195 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) { 3196 /* 3197 * If we can get it in, in a few attempts we do 3198 * this, otherwise we let the timer fire. 3199 */ 3200 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, 3201 stcb, net, 3202 SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 3203 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 3204 } 3205 break; 3206 case SCTP_SELECTIVE_ACK: 3207 case SCTP_NR_SELECTIVE_ACK: 3208 /* resend the sack */ 3209 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED); 3210 break; 3211 case SCTP_HEARTBEAT_REQUEST: 3212 /* resend a demand HB */ 3213 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) { 3214 /* 3215 * Only retransmit if we KNOW we wont destroy the 3216 * tcb 3217 */ 3218 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 3219 } 3220 break; 3221 case SCTP_SHUTDOWN: 3222 sctp_send_shutdown(stcb, net); 3223 break; 3224 case SCTP_SHUTDOWN_ACK: 3225 sctp_send_shutdown_ack(stcb, net); 3226 break; 3227 case SCTP_COOKIE_ECHO: 3228 { 3229 struct sctp_tmit_chunk *cookie; 3230 3231 cookie = NULL; 3232 TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, 3233 sctp_next) { 3234 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) { 3235 break; 3236 } 3237 } 3238 if (cookie) { 3239 if (cookie->sent != SCTP_DATAGRAM_RESEND) 3240 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3241 cookie->sent = SCTP_DATAGRAM_RESEND; 3242 sctp_stop_all_cookie_timers(stcb); 3243 } 3244 } 3245 break; 3246 case SCTP_COOKIE_ACK: 3247 sctp_send_cookie_ack(stcb); 3248 break; 3249 case SCTP_ASCONF_ACK: 3250 /* resend last asconf ack */ 3251 sctp_send_asconf_ack(stcb); 3252 break; 3253 case SCTP_IFORWARD_CUM_TSN: 3254 case SCTP_FORWARD_CUM_TSN: 3255 send_forward_tsn(stcb, &stcb->asoc); 3256 break; 3257 /* can't do anything with these */ 3258 case SCTP_PACKET_DROPPED: 3259 case SCTP_INITIATION_ACK: /* this should not happen */ 3260 case SCTP_HEARTBEAT_ACK: 3261 case SCTP_ABORT_ASSOCIATION: 3262 case SCTP_OPERATION_ERROR: 3263 case SCTP_SHUTDOWN_COMPLETE: 3264 case SCTP_ECN_ECHO: 3265 case SCTP_ECN_CWR: 3266 default: 3267 break; 3268 } 3269 return (0); 3270 } 3271 3272 void 3273 sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list) 3274 { 3275 uint32_t i; 3276 uint16_t temp; 3277 3278 /* 3279 * We set things to 0xffffffff since this is the last delivered 3280 * sequence and we will be sending in 0 after the reset. 3281 */ 3282 3283 if (number_entries) { 3284 for (i = 0; i < number_entries; i++) { 3285 temp = ntohs(list[i]); 3286 if (temp >= stcb->asoc.streamincnt) { 3287 continue; 3288 } 3289 stcb->asoc.strmin[temp].last_mid_delivered = 0xffffffff; 3290 } 3291 } else { 3292 list = NULL; 3293 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3294 stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff; 3295 } 3296 } 3297 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3298 } 3299 3300 static void 3301 sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list) 3302 { 3303 uint32_t i; 3304 uint16_t temp; 3305 3306 if (number_entries > 0) { 3307 for (i = 0; i < number_entries; i++) { 3308 temp = ntohs(list[i]); 3309 if (temp >= stcb->asoc.streamoutcnt) { 3310 /* no such stream */ 3311 continue; 3312 } 3313 stcb->asoc.strmout[temp].next_mid_ordered = 0; 3314 stcb->asoc.strmout[temp].next_mid_unordered = 0; 3315 } 3316 } else { 3317 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3318 stcb->asoc.strmout[i].next_mid_ordered = 0; 3319 stcb->asoc.strmout[i].next_mid_unordered = 0; 3320 } 3321 } 3322 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3323 } 3324 3325 static void 3326 sctp_reset_clear_pending(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].state = SCTP_STREAM_OPEN; 3339 } 3340 } else { 3341 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3342 stcb->asoc.strmout[i].state = SCTP_STREAM_OPEN; 3343 } 3344 } 3345 } 3346 3347 struct sctp_stream_reset_request * 3348 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk) 3349 { 3350 struct sctp_association *asoc; 3351 struct sctp_chunkhdr *ch; 3352 struct sctp_stream_reset_request *r; 3353 struct sctp_tmit_chunk *chk; 3354 int len, clen; 3355 3356 asoc = &stcb->asoc; 3357 if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 3358 asoc->stream_reset_outstanding = 0; 3359 return (NULL); 3360 } 3361 if (stcb->asoc.str_reset == NULL) { 3362 asoc->stream_reset_outstanding = 0; 3363 return (NULL); 3364 } 3365 chk = stcb->asoc.str_reset; 3366 if (chk->data == NULL) { 3367 return (NULL); 3368 } 3369 if (bchk) { 3370 /* he wants a copy of the chk pointer */ 3371 *bchk = chk; 3372 } 3373 clen = chk->send_size; 3374 ch = mtod(chk->data, struct sctp_chunkhdr *); 3375 r = (struct sctp_stream_reset_request *)(ch + 1); 3376 if (ntohl(r->request_seq) == seq) { 3377 /* found it */ 3378 return (r); 3379 } 3380 len = SCTP_SIZE32(ntohs(r->ph.param_length)); 3381 if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) { 3382 /* move to the next one, there can only be a max of two */ 3383 r = (struct sctp_stream_reset_request *)((caddr_t)r + len); 3384 if (ntohl(r->request_seq) == seq) { 3385 return (r); 3386 } 3387 } 3388 /* that seq is not here */ 3389 return (NULL); 3390 } 3391 3392 static void 3393 sctp_clean_up_stream_reset(struct sctp_tcb *stcb) 3394 { 3395 struct sctp_association *asoc; 3396 struct sctp_tmit_chunk *chk; 3397 3398 asoc = &stcb->asoc; 3399 chk = asoc->str_reset; 3400 if (chk == NULL) { 3401 return; 3402 } 3403 asoc->str_reset = NULL; 3404 sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, 3405 NULL, SCTP_FROM_SCTP_INPUT + SCTP_LOC_28); 3406 TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next); 3407 asoc->ctrl_queue_cnt--; 3408 if (chk->data) { 3409 sctp_m_freem(chk->data); 3410 chk->data = NULL; 3411 } 3412 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3413 } 3414 3415 static int 3416 sctp_handle_stream_reset_response(struct sctp_tcb *stcb, 3417 uint32_t seq, uint32_t action, 3418 struct sctp_stream_reset_response *respin) 3419 { 3420 uint16_t type; 3421 int lparam_len; 3422 struct sctp_association *asoc = &stcb->asoc; 3423 struct sctp_tmit_chunk *chk; 3424 struct sctp_stream_reset_request *req_param; 3425 struct sctp_stream_reset_out_request *req_out_param; 3426 struct sctp_stream_reset_in_request *req_in_param; 3427 uint32_t number_entries; 3428 3429 if (asoc->stream_reset_outstanding == 0) { 3430 /* duplicate */ 3431 return (0); 3432 } 3433 if (seq == stcb->asoc.str_reset_seq_out) { 3434 req_param = sctp_find_stream_reset(stcb, seq, &chk); 3435 if (req_param != NULL) { 3436 stcb->asoc.str_reset_seq_out++; 3437 type = ntohs(req_param->ph.param_type); 3438 lparam_len = ntohs(req_param->ph.param_length); 3439 if (type == SCTP_STR_RESET_OUT_REQUEST) { 3440 int no_clear = 0; 3441 3442 req_out_param = (struct sctp_stream_reset_out_request *)req_param; 3443 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t); 3444 asoc->stream_reset_out_is_outstanding = 0; 3445 if (asoc->stream_reset_outstanding) 3446 asoc->stream_reset_outstanding--; 3447 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3448 /* do it */ 3449 sctp_reset_out_streams(stcb, number_entries, req_out_param->list_of_streams); 3450 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3451 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3452 } else if (action == SCTP_STREAM_RESET_RESULT_IN_PROGRESS) { 3453 /* 3454 * Set it up so we don't stop 3455 * retransmitting 3456 */ 3457 asoc->stream_reset_outstanding++; 3458 stcb->asoc.str_reset_seq_out--; 3459 asoc->stream_reset_out_is_outstanding = 1; 3460 no_clear = 1; 3461 } else { 3462 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3463 } 3464 if (no_clear == 0) { 3465 sctp_reset_clear_pending(stcb, number_entries, req_out_param->list_of_streams); 3466 } 3467 } else if (type == SCTP_STR_RESET_IN_REQUEST) { 3468 req_in_param = (struct sctp_stream_reset_in_request *)req_param; 3469 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t); 3470 if (asoc->stream_reset_outstanding) 3471 asoc->stream_reset_outstanding--; 3472 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3473 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb, 3474 number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3475 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3476 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb, 3477 number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3478 } 3479 } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) { 3480 /* Ok we now may have more streams */ 3481 int num_stream; 3482 3483 num_stream = stcb->asoc.strm_pending_add_size; 3484 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) { 3485 /* TSNH */ 3486 num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt; 3487 } 3488 stcb->asoc.strm_pending_add_size = 0; 3489 if (asoc->stream_reset_outstanding) 3490 asoc->stream_reset_outstanding--; 3491 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3492 /* Put the new streams into effect */ 3493 int i; 3494 3495 for (i = asoc->streamoutcnt; i < (asoc->streamoutcnt + num_stream); i++) { 3496 asoc->strmout[i].state = SCTP_STREAM_OPEN; 3497 } 3498 asoc->streamoutcnt += num_stream; 3499 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 3500 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3501 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3502 SCTP_STREAM_CHANGE_DENIED); 3503 } else { 3504 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3505 SCTP_STREAM_CHANGE_FAILED); 3506 } 3507 } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) { 3508 if (asoc->stream_reset_outstanding) 3509 asoc->stream_reset_outstanding--; 3510 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3511 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3512 SCTP_STREAM_CHANGE_DENIED); 3513 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3514 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3515 SCTP_STREAM_CHANGE_FAILED); 3516 } 3517 } else if (type == SCTP_STR_RESET_TSN_REQUEST) { 3518 /** 3519 * a) Adopt the new in tsn. 3520 * b) reset the map 3521 * c) Adopt the new out-tsn 3522 */ 3523 struct sctp_stream_reset_response_tsn *resp; 3524 struct sctp_forward_tsn_chunk fwdtsn; 3525 int abort_flag = 0; 3526 3527 if (respin == NULL) { 3528 /* huh ? */ 3529 return (0); 3530 } 3531 if (ntohs(respin->ph.param_length) < sizeof(struct sctp_stream_reset_response_tsn)) { 3532 return (0); 3533 } 3534 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3535 resp = (struct sctp_stream_reset_response_tsn *)respin; 3536 asoc->stream_reset_outstanding--; 3537 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3538 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3539 fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1); 3540 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3541 if (abort_flag) { 3542 return (1); 3543 } 3544 stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1); 3545 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3546 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3547 } 3548 3549 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 3550 stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn); 3551 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 3552 3553 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map; 3554 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size); 3555 3556 stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn); 3557 stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn; 3558 3559 sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL); 3560 sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL); 3561 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0); 3562 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3563 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3564 SCTP_ASSOC_RESET_DENIED); 3565 } else { 3566 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3567 SCTP_ASSOC_RESET_FAILED); 3568 } 3569 } 3570 /* get rid of the request and get the request flags */ 3571 if (asoc->stream_reset_outstanding == 0) { 3572 sctp_clean_up_stream_reset(stcb); 3573 } 3574 } 3575 } 3576 if (asoc->stream_reset_outstanding == 0) { 3577 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED); 3578 } 3579 return (0); 3580 } 3581 3582 static void 3583 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb, 3584 struct sctp_tmit_chunk *chk, 3585 struct sctp_stream_reset_in_request *req, int trunc) 3586 { 3587 uint32_t seq; 3588 int len, i; 3589 int number_entries; 3590 uint16_t temp; 3591 3592 /* 3593 * peer wants me to send a str-reset to him for my outgoing seq's if 3594 * seq_in is right. 3595 */ 3596 struct sctp_association *asoc = &stcb->asoc; 3597 3598 seq = ntohl(req->request_seq); 3599 if (asoc->str_reset_seq_in == seq) { 3600 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3601 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3602 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3603 } else if (trunc) { 3604 /* Can't do it, since they exceeded our buffer size */ 3605 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3606 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) { 3607 len = ntohs(req->ph.param_length); 3608 number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t)); 3609 if (number_entries) { 3610 for (i = 0; i < number_entries; i++) { 3611 temp = ntohs(req->list_of_streams[i]); 3612 if (temp >= stcb->asoc.streamoutcnt) { 3613 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3614 goto bad_boy; 3615 } 3616 req->list_of_streams[i] = temp; 3617 } 3618 for (i = 0; i < number_entries; i++) { 3619 if (stcb->asoc.strmout[req->list_of_streams[i]].state == SCTP_STREAM_OPEN) { 3620 stcb->asoc.strmout[req->list_of_streams[i]].state = SCTP_STREAM_RESET_PENDING; 3621 } 3622 } 3623 } else { 3624 /* Its all */ 3625 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3626 if (stcb->asoc.strmout[i].state == SCTP_STREAM_OPEN) 3627 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_PENDING; 3628 } 3629 } 3630 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3631 } else { 3632 /* Can't do it, since we have sent one out */ 3633 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 3634 } 3635 bad_boy: 3636 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3637 asoc->str_reset_seq_in++; 3638 } else if (asoc->str_reset_seq_in - 1 == seq) { 3639 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3640 } else if (asoc->str_reset_seq_in - 2 == seq) { 3641 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3642 } else { 3643 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3644 } 3645 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED); 3646 } 3647 3648 static int 3649 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb, 3650 struct sctp_tmit_chunk *chk, 3651 struct sctp_stream_reset_tsn_request *req) 3652 { 3653 /* reset all in and out and update the tsn */ 3654 /* 3655 * A) reset my str-seq's on in and out. B) Select a receive next, 3656 * and set cum-ack to it. Also process this selected number as a 3657 * fwd-tsn as well. C) set in the response my next sending seq. 3658 */ 3659 struct sctp_forward_tsn_chunk fwdtsn; 3660 struct sctp_association *asoc = &stcb->asoc; 3661 int abort_flag = 0; 3662 uint32_t seq; 3663 3664 seq = ntohl(req->request_seq); 3665 if (asoc->str_reset_seq_in == seq) { 3666 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3667 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 3668 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3669 } else { 3670 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3671 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3672 fwdtsn.ch.chunk_flags = 0; 3673 fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1); 3674 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3675 if (abort_flag) { 3676 return (1); 3677 } 3678 asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA; 3679 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3680 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3681 } 3682 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map; 3683 asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1; 3684 memset(asoc->mapping_array, 0, asoc->mapping_array_size); 3685 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 3686 memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size); 3687 atomic_add_int(&asoc->sending_seq, 1); 3688 /* save off historical data for retrans */ 3689 asoc->last_sending_seq[1] = asoc->last_sending_seq[0]; 3690 asoc->last_sending_seq[0] = asoc->sending_seq; 3691 asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0]; 3692 asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn; 3693 sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL); 3694 sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL); 3695 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3696 sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0); 3697 } 3698 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3699 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3700 asoc->str_reset_seq_in++; 3701 } else if (asoc->str_reset_seq_in - 1 == seq) { 3702 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3703 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3704 } else if (asoc->str_reset_seq_in - 2 == seq) { 3705 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1], 3706 asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]); 3707 } else { 3708 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3709 } 3710 return (0); 3711 } 3712 3713 static void 3714 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb, 3715 struct sctp_tmit_chunk *chk, 3716 struct sctp_stream_reset_out_request *req, int trunc) 3717 { 3718 uint32_t seq, tsn; 3719 int number_entries, len; 3720 struct sctp_association *asoc = &stcb->asoc; 3721 3722 seq = ntohl(req->request_seq); 3723 3724 /* now if its not a duplicate we process it */ 3725 if (asoc->str_reset_seq_in == seq) { 3726 len = ntohs(req->ph.param_length); 3727 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t)); 3728 /* 3729 * the sender is resetting, handle the list issue.. we must 3730 * a) verify if we can do the reset, if so no problem b) If 3731 * we can't do the reset we must copy the request. c) queue 3732 * it, and setup the data in processor to trigger it off 3733 * when needed and dequeue all the queued data. 3734 */ 3735 tsn = ntohl(req->send_reset_at_tsn); 3736 3737 /* move the reset action back one */ 3738 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3739 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3740 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3741 } else if (trunc) { 3742 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3743 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) { 3744 /* we can do it now */ 3745 sctp_reset_in_stream(stcb, number_entries, req->list_of_streams); 3746 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3747 } else { 3748 /* 3749 * we must queue it up and thus wait for the TSN's 3750 * to arrive that are at or before tsn 3751 */ 3752 struct sctp_stream_reset_list *liste; 3753 int siz; 3754 3755 siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t)); 3756 SCTP_MALLOC(liste, struct sctp_stream_reset_list *, 3757 siz, SCTP_M_STRESET); 3758 if (liste == NULL) { 3759 /* gak out of memory */ 3760 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3761 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3762 return; 3763 } 3764 liste->seq = seq; 3765 liste->tsn = tsn; 3766 liste->number_entries = number_entries; 3767 memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t)); 3768 TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp); 3769 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_IN_PROGRESS; 3770 } 3771 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3772 asoc->str_reset_seq_in++; 3773 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3774 /* 3775 * one seq back, just echo back last action since my 3776 * response was lost. 3777 */ 3778 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3779 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3780 /* 3781 * two seq back, just echo back last action since my 3782 * response was lost. 3783 */ 3784 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3785 } else { 3786 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3787 } 3788 } 3789 3790 static void 3791 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 3792 struct sctp_stream_reset_add_strm *str_add) 3793 { 3794 /* 3795 * Peer is requesting to add more streams. If its within our 3796 * max-streams we will allow it. 3797 */ 3798 uint32_t num_stream, i; 3799 uint32_t seq; 3800 struct sctp_association *asoc = &stcb->asoc; 3801 struct sctp_queued_to_read *ctl, *nctl; 3802 3803 /* Get the number. */ 3804 seq = ntohl(str_add->request_seq); 3805 num_stream = ntohs(str_add->number_of_streams); 3806 /* Now what would be the new total? */ 3807 if (asoc->str_reset_seq_in == seq) { 3808 num_stream += stcb->asoc.streamincnt; 3809 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3810 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 3811 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3812 } else if ((num_stream > stcb->asoc.max_inbound_streams) || 3813 (num_stream > 0xffff)) { 3814 /* We must reject it they ask for to many */ 3815 denied: 3816 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3817 } else { 3818 /* Ok, we can do that :-) */ 3819 struct sctp_stream_in *oldstrm; 3820 3821 /* save off the old */ 3822 oldstrm = stcb->asoc.strmin; 3823 SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *, 3824 (num_stream * sizeof(struct sctp_stream_in)), 3825 SCTP_M_STRMI); 3826 if (stcb->asoc.strmin == NULL) { 3827 stcb->asoc.strmin = oldstrm; 3828 goto denied; 3829 } 3830 /* copy off the old data */ 3831 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3832 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 3833 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue); 3834 stcb->asoc.strmin[i].sid = i; 3835 stcb->asoc.strmin[i].last_mid_delivered = oldstrm[i].last_mid_delivered; 3836 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started; 3837 stcb->asoc.strmin[i].pd_api_started = oldstrm[i].pd_api_started; 3838 /* now anything on those queues? */ 3839 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next_instrm, nctl) { 3840 TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next_instrm); 3841 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next_instrm); 3842 } 3843 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].uno_inqueue, next_instrm, nctl) { 3844 TAILQ_REMOVE(&oldstrm[i].uno_inqueue, ctl, next_instrm); 3845 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].uno_inqueue, ctl, next_instrm); 3846 } 3847 } 3848 /* Init the new streams */ 3849 for (i = stcb->asoc.streamincnt; i < num_stream; i++) { 3850 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 3851 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue); 3852 stcb->asoc.strmin[i].sid = i; 3853 stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff; 3854 stcb->asoc.strmin[i].pd_api_started = 0; 3855 stcb->asoc.strmin[i].delivery_started = 0; 3856 } 3857 SCTP_FREE(oldstrm, SCTP_M_STRMI); 3858 /* update the size */ 3859 stcb->asoc.streamincnt = num_stream; 3860 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3861 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 3862 } 3863 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3864 asoc->str_reset_seq_in++; 3865 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3866 /* 3867 * one seq back, just echo back last action since my 3868 * response was lost. 3869 */ 3870 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3871 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3872 /* 3873 * two seq back, just echo back last action since my 3874 * response was lost. 3875 */ 3876 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3877 } else { 3878 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3879 } 3880 } 3881 3882 static void 3883 sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 3884 struct sctp_stream_reset_add_strm *str_add) 3885 { 3886 /* 3887 * Peer is requesting to add more streams. If its within our 3888 * max-streams we will allow it. 3889 */ 3890 uint16_t num_stream; 3891 uint32_t seq; 3892 struct sctp_association *asoc = &stcb->asoc; 3893 3894 /* Get the number. */ 3895 seq = ntohl(str_add->request_seq); 3896 num_stream = ntohs(str_add->number_of_streams); 3897 /* Now what would be the new total? */ 3898 if (asoc->str_reset_seq_in == seq) { 3899 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3900 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 3901 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3902 } else if (stcb->asoc.stream_reset_outstanding) { 3903 /* We must reject it we have something pending */ 3904 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 3905 } else { 3906 /* Ok, we can do that :-) */ 3907 int mychk; 3908 3909 mychk = stcb->asoc.streamoutcnt; 3910 mychk += num_stream; 3911 if (mychk < 0x10000) { 3912 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3913 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 1, num_stream, 0, 1)) { 3914 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3915 } 3916 } else { 3917 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3918 } 3919 } 3920 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]); 3921 asoc->str_reset_seq_in++; 3922 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3923 /* 3924 * one seq back, just echo back last action since my 3925 * response was lost. 3926 */ 3927 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3928 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3929 /* 3930 * two seq back, just echo back last action since my 3931 * response was lost. 3932 */ 3933 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3934 } else { 3935 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3936 } 3937 } 3938 3939 #ifdef __GNUC__ 3940 __attribute__((noinline)) 3941 #endif 3942 static int 3943 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset, 3944 struct sctp_chunkhdr *ch_req) 3945 { 3946 uint16_t remaining_length, param_len, ptype; 3947 struct sctp_paramhdr pstore; 3948 uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE]; 3949 uint32_t seq = 0; 3950 int num_req = 0; 3951 int trunc = 0; 3952 struct sctp_tmit_chunk *chk; 3953 struct sctp_chunkhdr *ch; 3954 struct sctp_paramhdr *ph; 3955 int ret_code = 0; 3956 int num_param = 0; 3957 3958 /* now it may be a reset or a reset-response */ 3959 remaining_length = ntohs(ch_req->chunk_length) - sizeof(struct sctp_chunkhdr); 3960 3961 /* setup for adding the response */ 3962 sctp_alloc_a_chunk(stcb, chk); 3963 if (chk == NULL) { 3964 return (ret_code); 3965 } 3966 chk->copy_by_ref = 0; 3967 chk->rec.chunk_id.id = SCTP_STREAM_RESET; 3968 chk->rec.chunk_id.can_take_data = 0; 3969 chk->flags = 0; 3970 chk->asoc = &stcb->asoc; 3971 chk->no_fr_allowed = 0; 3972 chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr); 3973 chk->book_size_scale = 0; 3974 chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA); 3975 if (chk->data == NULL) { 3976 strres_nochunk: 3977 if (chk->data) { 3978 sctp_m_freem(chk->data); 3979 chk->data = NULL; 3980 } 3981 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3982 return (ret_code); 3983 } 3984 SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD); 3985 3986 /* setup chunk parameters */ 3987 chk->sent = SCTP_DATAGRAM_UNSENT; 3988 chk->snd_count = 0; 3989 chk->whoTo = NULL; 3990 3991 ch = mtod(chk->data, struct sctp_chunkhdr *); 3992 ch->chunk_type = SCTP_STREAM_RESET; 3993 ch->chunk_flags = 0; 3994 ch->chunk_length = htons(chk->send_size); 3995 SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size); 3996 offset += sizeof(struct sctp_chunkhdr); 3997 while (remaining_length >= sizeof(struct sctp_paramhdr)) { 3998 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *)&pstore); 3999 if (ph == NULL) { 4000 /* TSNH */ 4001 break; 4002 } 4003 param_len = ntohs(ph->param_length); 4004 if ((param_len > remaining_length) || 4005 (param_len < (sizeof(struct sctp_paramhdr) + sizeof(uint32_t)))) { 4006 /* bad parameter length */ 4007 break; 4008 } 4009 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, sizeof(cstore)), 4010 (uint8_t *)&cstore); 4011 if (ph == NULL) { 4012 /* TSNH */ 4013 break; 4014 } 4015 ptype = ntohs(ph->param_type); 4016 num_param++; 4017 if (param_len > sizeof(cstore)) { 4018 trunc = 1; 4019 } else { 4020 trunc = 0; 4021 } 4022 if (num_param > SCTP_MAX_RESET_PARAMS) { 4023 /* hit the max of parameters already sorry.. */ 4024 break; 4025 } 4026 if (ptype == SCTP_STR_RESET_OUT_REQUEST) { 4027 struct sctp_stream_reset_out_request *req_out; 4028 4029 if (param_len < sizeof(struct sctp_stream_reset_out_request)) { 4030 break; 4031 } 4032 req_out = (struct sctp_stream_reset_out_request *)ph; 4033 num_req++; 4034 if (stcb->asoc.stream_reset_outstanding) { 4035 seq = ntohl(req_out->response_seq); 4036 if (seq == stcb->asoc.str_reset_seq_out) { 4037 /* implicit ack */ 4038 (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL); 4039 } 4040 } 4041 sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc); 4042 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) { 4043 struct sctp_stream_reset_add_strm *str_add; 4044 4045 if (param_len < sizeof(struct sctp_stream_reset_add_strm)) { 4046 break; 4047 } 4048 str_add = (struct sctp_stream_reset_add_strm *)ph; 4049 num_req++; 4050 sctp_handle_str_reset_add_strm(stcb, chk, str_add); 4051 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) { 4052 struct sctp_stream_reset_add_strm *str_add; 4053 4054 if (param_len < sizeof(struct sctp_stream_reset_add_strm)) { 4055 break; 4056 } 4057 str_add = (struct sctp_stream_reset_add_strm *)ph; 4058 num_req++; 4059 sctp_handle_str_reset_add_out_strm(stcb, chk, str_add); 4060 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) { 4061 struct sctp_stream_reset_in_request *req_in; 4062 4063 num_req++; 4064 req_in = (struct sctp_stream_reset_in_request *)ph; 4065 sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc); 4066 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) { 4067 struct sctp_stream_reset_tsn_request *req_tsn; 4068 4069 num_req++; 4070 req_tsn = (struct sctp_stream_reset_tsn_request *)ph; 4071 if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) { 4072 ret_code = 1; 4073 goto strres_nochunk; 4074 } 4075 /* no more */ 4076 break; 4077 } else if (ptype == SCTP_STR_RESET_RESPONSE) { 4078 struct sctp_stream_reset_response *resp; 4079 uint32_t result; 4080 4081 if (param_len < sizeof(struct sctp_stream_reset_response)) { 4082 break; 4083 } 4084 resp = (struct sctp_stream_reset_response *)ph; 4085 seq = ntohl(resp->response_seq); 4086 result = ntohl(resp->result); 4087 if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) { 4088 ret_code = 1; 4089 goto strres_nochunk; 4090 } 4091 } else { 4092 break; 4093 } 4094 offset += SCTP_SIZE32(param_len); 4095 if (remaining_length >= SCTP_SIZE32(param_len)) { 4096 remaining_length -= SCTP_SIZE32(param_len); 4097 } else { 4098 remaining_length = 0; 4099 } 4100 } 4101 if (num_req == 0) { 4102 /* we have no response free the stuff */ 4103 goto strres_nochunk; 4104 } 4105 /* ok we have a chunk to link in */ 4106 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, 4107 chk, 4108 sctp_next); 4109 stcb->asoc.ctrl_queue_cnt++; 4110 return (ret_code); 4111 } 4112 4113 /* 4114 * Handle a router or endpoints report of a packet loss, there are two ways 4115 * to handle this, either we get the whole packet and must disect it 4116 * ourselves (possibly with truncation and or corruption) or it is a summary 4117 * from a middle box that did the disectting for us. 4118 */ 4119 static void 4120 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp, 4121 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 4122 { 4123 struct sctp_chunk_desc desc; 4124 struct sctp_chunkhdr *chk_hdr; 4125 struct sctp_data_chunk *data_chunk; 4126 struct sctp_idata_chunk *idata_chunk; 4127 uint32_t bottle_bw, on_queue; 4128 uint32_t offset, chk_len; 4129 uint16_t pktdrp_len; 4130 uint8_t pktdrp_flags; 4131 4132 KASSERT(sizeof(struct sctp_pktdrop_chunk) <= limit, 4133 ("PKTDROP chunk too small")); 4134 pktdrp_flags = cp->ch.chunk_flags; 4135 pktdrp_len = ntohs(cp->ch.chunk_length); 4136 KASSERT(limit <= pktdrp_len, ("Inconsistent limit")); 4137 if (pktdrp_flags & SCTP_PACKET_TRUNCATED) { 4138 if (ntohs(cp->trunc_len) <= pktdrp_len - sizeof(struct sctp_pktdrop_chunk)) { 4139 /* The peer plays games with us. */ 4140 return; 4141 } 4142 } 4143 limit -= sizeof(struct sctp_pktdrop_chunk); 4144 offset = 0; 4145 if (offset == limit) { 4146 if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) { 4147 SCTP_STAT_INCR(sctps_pdrpbwrpt); 4148 } 4149 } else if (offset + sizeof(struct sctphdr) > limit) { 4150 /* Only a partial SCTP common header. */ 4151 SCTP_STAT_INCR(sctps_pdrpcrupt); 4152 offset = limit; 4153 } else { 4154 /* XXX: Check embedded SCTP common header. */ 4155 offset += sizeof(struct sctphdr); 4156 } 4157 /* Now parse through the chunks themselves. */ 4158 while (offset < limit) { 4159 if (offset + sizeof(struct sctp_chunkhdr) > limit) { 4160 SCTP_STAT_INCR(sctps_pdrpcrupt); 4161 break; 4162 } 4163 chk_hdr = (struct sctp_chunkhdr *)(cp->data + offset); 4164 desc.chunk_type = chk_hdr->chunk_type; 4165 /* get amount we need to move */ 4166 chk_len = (uint32_t)ntohs(chk_hdr->chunk_length); 4167 if (chk_len < sizeof(struct sctp_chunkhdr)) { 4168 /* Someone is lying... */ 4169 break; 4170 } 4171 if (desc.chunk_type == SCTP_DATA) { 4172 if (stcb->asoc.idata_supported) { 4173 /* Some is playing games with us. */ 4174 break; 4175 } 4176 if (chk_len <= sizeof(struct sctp_data_chunk)) { 4177 /* Some is playing games with us. */ 4178 break; 4179 } 4180 if (chk_len < sizeof(struct sctp_data_chunk) + SCTP_NUM_DB_TO_VERIFY) { 4181 /* 4182 * Not enough data bytes available in the 4183 * chunk. 4184 */ 4185 SCTP_STAT_INCR(sctps_pdrpnedat); 4186 goto next_chunk; 4187 } 4188 if (offset + sizeof(struct sctp_data_chunk) + SCTP_NUM_DB_TO_VERIFY > limit) { 4189 /* Not enough data in buffer. */ 4190 break; 4191 } 4192 data_chunk = (struct sctp_data_chunk *)(cp->data + offset); 4193 memcpy(desc.data_bytes, data_chunk + 1, SCTP_NUM_DB_TO_VERIFY); 4194 desc.tsn_ifany = data_chunk->dp.tsn; 4195 if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) { 4196 SCTP_STAT_INCR(sctps_pdrpmbda); 4197 } 4198 } else if (desc.chunk_type == SCTP_IDATA) { 4199 if (!stcb->asoc.idata_supported) { 4200 /* Some is playing games with us. */ 4201 break; 4202 } 4203 if (chk_len <= sizeof(struct sctp_idata_chunk)) { 4204 /* Some is playing games with us. */ 4205 break; 4206 } 4207 if (chk_len < sizeof(struct sctp_idata_chunk) + SCTP_NUM_DB_TO_VERIFY) { 4208 /* 4209 * Not enough data bytes available in the 4210 * chunk. 4211 */ 4212 SCTP_STAT_INCR(sctps_pdrpnedat); 4213 goto next_chunk; 4214 } 4215 if (offset + sizeof(struct sctp_idata_chunk) + SCTP_NUM_DB_TO_VERIFY > limit) { 4216 /* Not enough data in buffer. */ 4217 break; 4218 } 4219 idata_chunk = (struct sctp_idata_chunk *)(cp->data + offset); 4220 memcpy(desc.data_bytes, idata_chunk + 1, SCTP_NUM_DB_TO_VERIFY); 4221 desc.tsn_ifany = idata_chunk->dp.tsn; 4222 if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) { 4223 SCTP_STAT_INCR(sctps_pdrpmbda); 4224 } 4225 } else { 4226 if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) { 4227 SCTP_STAT_INCR(sctps_pdrpmbct); 4228 } 4229 } 4230 if (process_chunk_drop(stcb, &desc, net, pktdrp_flags)) { 4231 SCTP_STAT_INCR(sctps_pdrppdbrk); 4232 break; 4233 } 4234 next_chunk: 4235 offset += SCTP_SIZE32(chk_len); 4236 } 4237 /* Now update any rwnd --- possibly */ 4238 if ((pktdrp_flags & SCTP_FROM_MIDDLE_BOX) == 0) { 4239 /* From a peer, we get a rwnd report */ 4240 uint32_t a_rwnd; 4241 4242 SCTP_STAT_INCR(sctps_pdrpfehos); 4243 4244 bottle_bw = ntohl(cp->bottle_bw); 4245 on_queue = ntohl(cp->current_onq); 4246 if (bottle_bw && on_queue) { 4247 /* a rwnd report is in here */ 4248 if (bottle_bw > on_queue) 4249 a_rwnd = bottle_bw - on_queue; 4250 else 4251 a_rwnd = 0; 4252 4253 if (a_rwnd == 0) 4254 stcb->asoc.peers_rwnd = 0; 4255 else { 4256 if (a_rwnd > stcb->asoc.total_flight) { 4257 stcb->asoc.peers_rwnd = 4258 a_rwnd - stcb->asoc.total_flight; 4259 } else { 4260 stcb->asoc.peers_rwnd = 0; 4261 } 4262 if (stcb->asoc.peers_rwnd < 4263 stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 4264 /* SWS sender side engages */ 4265 stcb->asoc.peers_rwnd = 0; 4266 } 4267 } 4268 } 4269 } else { 4270 SCTP_STAT_INCR(sctps_pdrpfmbox); 4271 } 4272 4273 /* now middle boxes in sat networks get a cwnd bump */ 4274 if ((pktdrp_flags & SCTP_FROM_MIDDLE_BOX) && 4275 (stcb->asoc.sat_t3_loss_recovery == 0) && 4276 (stcb->asoc.sat_network)) { 4277 /* 4278 * This is debatable but for sat networks it makes sense 4279 * Note if a T3 timer has went off, we will prohibit any 4280 * changes to cwnd until we exit the t3 loss recovery. 4281 */ 4282 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb, 4283 net, cp, &bottle_bw, &on_queue); 4284 } 4285 } 4286 4287 /* 4288 * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to 4289 * still contain IP/SCTP header - stcb: is the tcb found for this packet - 4290 * offset: offset into the mbuf chain to first chunkhdr - length: is the 4291 * length of the complete packet outputs: - length: modified to remaining 4292 * length after control processing - netp: modified to new sctp_nets after 4293 * cookie-echo processing - return NULL to discard the packet (ie. no asoc, 4294 * bad packet,...) otherwise return the tcb for this packet 4295 */ 4296 #ifdef __GNUC__ 4297 __attribute__((noinline)) 4298 #endif 4299 static struct sctp_tcb * 4300 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length, 4301 struct sockaddr *src, struct sockaddr *dst, 4302 struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp, 4303 struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen, 4304 uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum, 4305 uint32_t vrf_id, uint16_t port) 4306 { 4307 struct sctp_association *asoc; 4308 struct mbuf *op_err; 4309 char msg[SCTP_DIAG_INFO_LEN]; 4310 uint32_t vtag_in; 4311 int num_chunks = 0; /* number of control chunks processed */ 4312 uint32_t chk_length, contiguous; 4313 int ret; 4314 int abort_no_unlock = 0; 4315 int ecne_seen = 0; 4316 4317 /* 4318 * How big should this be, and should it be alloc'd? Lets try the 4319 * d-mtu-ceiling for now (2k) and that should hopefully work ... 4320 * until we get into jumbo grams and such.. 4321 */ 4322 uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE]; 4323 int got_auth = 0; 4324 uint32_t auth_offset = 0, auth_len = 0; 4325 int auth_skipped = 0; 4326 int asconf_cnt = 0; 4327 4328 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n", 4329 iphlen, *offset, length, (void *)stcb); 4330 4331 if (stcb) { 4332 SCTP_TCB_LOCK_ASSERT(stcb); 4333 } 4334 /* validate chunk header length... */ 4335 if (ntohs(ch->chunk_length) < sizeof(*ch)) { 4336 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n", 4337 ntohs(ch->chunk_length)); 4338 *offset = length; 4339 return (stcb); 4340 } 4341 /* 4342 * validate the verification tag 4343 */ 4344 vtag_in = ntohl(sh->v_tag); 4345 4346 if (ch->chunk_type == SCTP_INITIATION) { 4347 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n", 4348 ntohs(ch->chunk_length), vtag_in); 4349 if (vtag_in != 0) { 4350 /* protocol error- silently discard... */ 4351 SCTP_STAT_INCR(sctps_badvtag); 4352 if (stcb != NULL) { 4353 SCTP_TCB_UNLOCK(stcb); 4354 } 4355 return (NULL); 4356 } 4357 } else if (ch->chunk_type != SCTP_COOKIE_ECHO) { 4358 /* 4359 * If there is no stcb, skip the AUTH chunk and process 4360 * later after a stcb is found (to validate the lookup was 4361 * valid. 4362 */ 4363 if ((ch->chunk_type == SCTP_AUTHENTICATION) && 4364 (stcb == NULL) && 4365 (inp->auth_supported == 1)) { 4366 /* save this chunk for later processing */ 4367 auth_skipped = 1; 4368 auth_offset = *offset; 4369 auth_len = ntohs(ch->chunk_length); 4370 4371 /* (temporarily) move past this chunk */ 4372 *offset += SCTP_SIZE32(auth_len); 4373 if (*offset >= length) { 4374 /* no more data left in the mbuf chain */ 4375 *offset = length; 4376 return (NULL); 4377 } 4378 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4379 sizeof(struct sctp_chunkhdr), chunk_buf); 4380 } 4381 if (ch == NULL) { 4382 /* Help */ 4383 *offset = length; 4384 return (stcb); 4385 } 4386 if (ch->chunk_type == SCTP_COOKIE_ECHO) { 4387 goto process_control_chunks; 4388 } 4389 /* 4390 * first check if it's an ASCONF with an unknown src addr we 4391 * need to look inside to find the association 4392 */ 4393 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) { 4394 struct sctp_chunkhdr *asconf_ch = ch; 4395 uint32_t asconf_offset = 0, asconf_len = 0; 4396 4397 /* inp's refcount may be reduced */ 4398 SCTP_INP_INCR_REF(inp); 4399 4400 asconf_offset = *offset; 4401 do { 4402 asconf_len = ntohs(asconf_ch->chunk_length); 4403 if (asconf_len < sizeof(struct sctp_asconf_paramhdr)) 4404 break; 4405 stcb = sctp_findassociation_ep_asconf(m, 4406 *offset, 4407 dst, 4408 sh, &inp, netp, vrf_id); 4409 if (stcb != NULL) 4410 break; 4411 asconf_offset += SCTP_SIZE32(asconf_len); 4412 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset, 4413 sizeof(struct sctp_chunkhdr), chunk_buf); 4414 } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF); 4415 if (stcb == NULL) { 4416 /* 4417 * reduce inp's refcount if not reduced in 4418 * sctp_findassociation_ep_asconf(). 4419 */ 4420 SCTP_INP_DECR_REF(inp); 4421 } 4422 4423 /* now go back and verify any auth chunk to be sure */ 4424 if (auth_skipped && (stcb != NULL)) { 4425 struct sctp_auth_chunk *auth; 4426 4427 if (auth_len <= SCTP_CHUNK_BUFFER_SIZE) { 4428 auth = (struct sctp_auth_chunk *)sctp_m_getptr(m, auth_offset, auth_len, chunk_buf); 4429 got_auth = 1; 4430 auth_skipped = 0; 4431 } else { 4432 auth = NULL; 4433 } 4434 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, 4435 auth_offset)) { 4436 /* auth HMAC failed so dump it */ 4437 *offset = length; 4438 return (stcb); 4439 } else { 4440 /* remaining chunks are HMAC checked */ 4441 stcb->asoc.authenticated = 1; 4442 } 4443 } 4444 } 4445 if (stcb == NULL) { 4446 SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 4447 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4448 msg); 4449 /* no association, so it's out of the blue... */ 4450 sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, op_err, 4451 mflowtype, mflowid, inp->fibnum, 4452 vrf_id, port); 4453 *offset = length; 4454 return (NULL); 4455 } 4456 asoc = &stcb->asoc; 4457 /* ABORT and SHUTDOWN can use either v_tag... */ 4458 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) || 4459 (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) || 4460 (ch->chunk_type == SCTP_PACKET_DROPPED)) { 4461 /* Take the T-bit always into account. */ 4462 if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) && 4463 (vtag_in == asoc->my_vtag)) || 4464 (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) && 4465 (asoc->peer_vtag != htonl(0)) && 4466 (vtag_in == asoc->peer_vtag))) { 4467 /* this is valid */ 4468 } else { 4469 /* drop this packet... */ 4470 SCTP_STAT_INCR(sctps_badvtag); 4471 if (stcb != NULL) { 4472 SCTP_TCB_UNLOCK(stcb); 4473 } 4474 return (NULL); 4475 } 4476 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 4477 if (vtag_in != asoc->my_vtag) { 4478 /* 4479 * this could be a stale SHUTDOWN-ACK or the 4480 * peer never got the SHUTDOWN-COMPLETE and 4481 * is still hung; we have started a new asoc 4482 * but it won't complete until the shutdown 4483 * is completed 4484 */ 4485 if (stcb != NULL) { 4486 SCTP_TCB_UNLOCK(stcb); 4487 } 4488 SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 4489 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4490 msg); 4491 sctp_handle_ootb(m, iphlen, *offset, src, dst, 4492 sh, inp, op_err, 4493 mflowtype, mflowid, fibnum, 4494 vrf_id, port); 4495 return (NULL); 4496 } 4497 } else { 4498 /* for all other chunks, vtag must match */ 4499 if (vtag_in != asoc->my_vtag) { 4500 /* invalid vtag... */ 4501 SCTPDBG(SCTP_DEBUG_INPUT3, 4502 "invalid vtag: %xh, expect %xh\n", 4503 vtag_in, asoc->my_vtag); 4504 SCTP_STAT_INCR(sctps_badvtag); 4505 if (stcb != NULL) { 4506 SCTP_TCB_UNLOCK(stcb); 4507 } 4508 *offset = length; 4509 return (NULL); 4510 } 4511 } 4512 } /* end if !SCTP_COOKIE_ECHO */ 4513 /* 4514 * process all control chunks... 4515 */ 4516 if (((ch->chunk_type == SCTP_SELECTIVE_ACK) || 4517 (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) || 4518 (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) && 4519 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 4520 /* implied cookie-ack.. we must have lost the ack */ 4521 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, 4522 *netp); 4523 } 4524 4525 process_control_chunks: 4526 while (IS_SCTP_CONTROL(ch)) { 4527 /* validate chunk length */ 4528 chk_length = ntohs(ch->chunk_length); 4529 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n", 4530 ch->chunk_type, chk_length); 4531 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length); 4532 if (chk_length < sizeof(*ch) || 4533 (*offset + (int)chk_length) > length) { 4534 *offset = length; 4535 return (stcb); 4536 } 4537 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks); 4538 /* 4539 * INIT and INIT-ACK only gets the init ack "header" portion 4540 * only because we don't have to process the peer's COOKIE. 4541 * All others get a complete chunk. 4542 */ 4543 switch (ch->chunk_type) { 4544 case SCTP_INITIATION: 4545 contiguous = sizeof(struct sctp_init_chunk); 4546 break; 4547 case SCTP_INITIATION_ACK: 4548 contiguous = sizeof(struct sctp_init_ack_chunk); 4549 break; 4550 default: 4551 contiguous = min(chk_length, sizeof(chunk_buf)); 4552 break; 4553 } 4554 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4555 contiguous, 4556 chunk_buf); 4557 if (ch == NULL) { 4558 *offset = length; 4559 if (stcb != NULL) { 4560 SCTP_TCB_UNLOCK(stcb); 4561 } 4562 return (NULL); 4563 } 4564 4565 num_chunks++; 4566 /* Save off the last place we got a control from */ 4567 if (stcb != NULL) { 4568 if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) { 4569 /* 4570 * allow last_control to be NULL if 4571 * ASCONF... ASCONF processing will find the 4572 * right net later 4573 */ 4574 if ((netp != NULL) && (*netp != NULL)) 4575 stcb->asoc.last_control_chunk_from = *netp; 4576 } 4577 } 4578 #ifdef SCTP_AUDITING_ENABLED 4579 sctp_audit_log(0xB0, ch->chunk_type); 4580 #endif 4581 4582 /* check to see if this chunk required auth, but isn't */ 4583 if ((stcb != NULL) && 4584 sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) && 4585 !stcb->asoc.authenticated) { 4586 /* "silently" ignore */ 4587 SCTP_STAT_INCR(sctps_recvauthmissing); 4588 goto next_chunk; 4589 } 4590 switch (ch->chunk_type) { 4591 case SCTP_INITIATION: 4592 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n"); 4593 /* The INIT chunk must be the only chunk. */ 4594 if ((num_chunks > 1) || 4595 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4596 /* RFC 4960 requires that no ABORT is sent */ 4597 *offset = length; 4598 if (stcb != NULL) { 4599 SCTP_TCB_UNLOCK(stcb); 4600 } 4601 return (NULL); 4602 } 4603 /* Honor our resource limit. */ 4604 if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) { 4605 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 4606 sctp_abort_association(inp, stcb, m, iphlen, 4607 src, dst, sh, op_err, 4608 mflowtype, mflowid, 4609 vrf_id, port); 4610 *offset = length; 4611 return (NULL); 4612 } 4613 sctp_handle_init(m, iphlen, *offset, src, dst, sh, 4614 (struct sctp_init_chunk *)ch, inp, 4615 stcb, *netp, &abort_no_unlock, 4616 mflowtype, mflowid, 4617 vrf_id, port); 4618 *offset = length; 4619 if ((!abort_no_unlock) && (stcb != NULL)) { 4620 SCTP_TCB_UNLOCK(stcb); 4621 } 4622 return (NULL); 4623 break; 4624 case SCTP_PAD_CHUNK: 4625 break; 4626 case SCTP_INITIATION_ACK: 4627 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT_ACK\n"); 4628 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4629 /* We are not interested anymore */ 4630 if ((stcb != NULL) && (stcb->asoc.total_output_queue_size)) { 4631 ; 4632 } else { 4633 *offset = length; 4634 if (stcb != NULL) { 4635 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 4636 SCTP_FROM_SCTP_INPUT + SCTP_LOC_29); 4637 } 4638 return (NULL); 4639 } 4640 } 4641 /* The INIT-ACK chunk must be the only chunk. */ 4642 if ((num_chunks > 1) || 4643 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4644 *offset = length; 4645 return (stcb); 4646 } 4647 if ((netp != NULL) && (*netp != NULL)) { 4648 ret = sctp_handle_init_ack(m, iphlen, *offset, 4649 src, dst, sh, 4650 (struct sctp_init_ack_chunk *)ch, 4651 stcb, *netp, 4652 &abort_no_unlock, 4653 mflowtype, mflowid, 4654 vrf_id); 4655 } else { 4656 ret = -1; 4657 } 4658 *offset = length; 4659 if (abort_no_unlock) { 4660 return (NULL); 4661 } 4662 /* 4663 * Special case, I must call the output routine to 4664 * get the cookie echoed 4665 */ 4666 if ((stcb != NULL) && (ret == 0)) { 4667 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 4668 } 4669 return (stcb); 4670 break; 4671 case SCTP_SELECTIVE_ACK: 4672 case SCTP_NR_SELECTIVE_ACK: 4673 { 4674 int abort_now = 0; 4675 uint32_t a_rwnd, cum_ack; 4676 uint16_t num_seg, num_nr_seg, num_dup; 4677 uint8_t flags; 4678 int offset_seg, offset_dup; 4679 4680 SCTPDBG(SCTP_DEBUG_INPUT3, "%s\n", 4681 ch->chunk_type == SCTP_SELECTIVE_ACK ? "SCTP_SACK" : "SCTP_NR_SACK"); 4682 SCTP_STAT_INCR(sctps_recvsacks); 4683 if (stcb == NULL) { 4684 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing %s chunk\n", 4685 (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK"); 4686 break; 4687 } 4688 if (ch->chunk_type == SCTP_SELECTIVE_ACK) { 4689 if (chk_length < sizeof(struct sctp_sack_chunk)) { 4690 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n"); 4691 break; 4692 } 4693 } else { 4694 if (stcb->asoc.nrsack_supported == 0) { 4695 goto unknown_chunk; 4696 } 4697 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) { 4698 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR_SACK chunk, too small\n"); 4699 break; 4700 } 4701 } 4702 if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4703 /*- 4704 * If we have sent a shutdown-ack, we will pay no 4705 * attention to a sack sent in to us since 4706 * we don't care anymore. 4707 */ 4708 break; 4709 } 4710 flags = ch->chunk_flags; 4711 if (ch->chunk_type == SCTP_SELECTIVE_ACK) { 4712 struct sctp_sack_chunk *sack; 4713 4714 sack = (struct sctp_sack_chunk *)ch; 4715 cum_ack = ntohl(sack->sack.cum_tsn_ack); 4716 num_seg = ntohs(sack->sack.num_gap_ack_blks); 4717 num_nr_seg = 0; 4718 num_dup = ntohs(sack->sack.num_dup_tsns); 4719 a_rwnd = ntohl(sack->sack.a_rwnd); 4720 if (sizeof(struct sctp_sack_chunk) + 4721 num_seg * sizeof(struct sctp_gap_ack_block) + 4722 num_dup * sizeof(uint32_t) != chk_length) { 4723 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n"); 4724 break; 4725 } 4726 offset_seg = *offset + sizeof(struct sctp_sack_chunk); 4727 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 4728 } else { 4729 struct sctp_nr_sack_chunk *nr_sack; 4730 4731 nr_sack = (struct sctp_nr_sack_chunk *)ch; 4732 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack); 4733 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks); 4734 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks); 4735 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns); 4736 a_rwnd = ntohl(nr_sack->nr_sack.a_rwnd); 4737 if (sizeof(struct sctp_nr_sack_chunk) + 4738 (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) + 4739 num_dup * sizeof(uint32_t) != chk_length) { 4740 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n"); 4741 break; 4742 } 4743 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk); 4744 offset_dup = offset_seg + (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block); 4745 } 4746 SCTPDBG(SCTP_DEBUG_INPUT3, "%s process cum_ack:%x num_seg:%d a_rwnd:%d\n", 4747 (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK", 4748 cum_ack, num_seg, a_rwnd); 4749 stcb->asoc.seen_a_sack_this_pkt = 1; 4750 if ((stcb->asoc.pr_sctp_cnt == 0) && 4751 (num_seg == 0) && (num_nr_seg == 0) && 4752 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 4753 (stcb->asoc.saw_sack_with_frags == 0) && 4754 (stcb->asoc.saw_sack_with_nr_frags == 0) && 4755 (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) { 4756 /* 4757 * We have a SIMPLE sack having no 4758 * prior segments and data on sent 4759 * queue to be acked. Use the faster 4760 * path sack processing. We also 4761 * allow window update sacks with no 4762 * missing segments to go this way 4763 * too. 4764 */ 4765 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, 4766 &abort_now, ecne_seen); 4767 } else { 4768 if ((netp != NULL) && (*netp != NULL)) { 4769 sctp_handle_sack(m, offset_seg, offset_dup, stcb, 4770 num_seg, num_nr_seg, num_dup, &abort_now, flags, 4771 cum_ack, a_rwnd, ecne_seen); 4772 } 4773 } 4774 if (abort_now) { 4775 /* ABORT signal from sack processing */ 4776 *offset = length; 4777 return (NULL); 4778 } 4779 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 4780 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 4781 (stcb->asoc.stream_queue_cnt == 0)) { 4782 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 4783 } 4784 break; 4785 } 4786 case SCTP_HEARTBEAT_REQUEST: 4787 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n"); 4788 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 4789 SCTP_STAT_INCR(sctps_recvheartbeat); 4790 sctp_send_heartbeat_ack(stcb, m, *offset, 4791 chk_length, *netp); 4792 } 4793 break; 4794 case SCTP_HEARTBEAT_ACK: 4795 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT_ACK\n"); 4796 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) { 4797 /* Its not ours */ 4798 *offset = length; 4799 return (stcb); 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 *offset = length; 4826 return (stcb); 4827 } 4828 if ((netp != NULL) && (*netp != NULL)) { 4829 int abort_flag = 0; 4830 4831 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch, 4832 stcb, *netp, &abort_flag); 4833 if (abort_flag) { 4834 *offset = length; 4835 return (NULL); 4836 } 4837 } 4838 break; 4839 case SCTP_SHUTDOWN_ACK: 4840 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_ACK, stcb %p\n", (void *)stcb); 4841 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 4842 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp); 4843 } 4844 *offset = length; 4845 return (NULL); 4846 break; 4847 case SCTP_OPERATION_ERROR: 4848 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP_ERR\n"); 4849 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL) && 4850 sctp_handle_error(ch, stcb, *netp, contiguous) < 0) { 4851 *offset = length; 4852 return (NULL); 4853 } 4854 break; 4855 case SCTP_COOKIE_ECHO: 4856 SCTPDBG(SCTP_DEBUG_INPUT3, 4857 "SCTP_COOKIE_ECHO, stcb %p\n", (void *)stcb); 4858 if ((stcb != NULL) && (stcb->asoc.total_output_queue_size > 0)) { 4859 ; 4860 } else { 4861 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4862 /* We are not interested anymore */ 4863 abend: 4864 if (stcb != NULL) { 4865 SCTP_TCB_UNLOCK(stcb); 4866 } 4867 *offset = length; 4868 return (NULL); 4869 } 4870 } 4871 /*- 4872 * First are we accepting? We do this again here 4873 * since it is possible that a previous endpoint WAS 4874 * listening responded to a INIT-ACK and then 4875 * closed. We opened and bound.. and are now no 4876 * longer listening. 4877 * 4878 * XXXGL: notes on checking listen queue length. 4879 * 1) SCTP_IS_LISTENING() doesn't necessarily mean 4880 * SOLISTENING(), because a listening "UDP type" 4881 * socket isn't listening in terms of the socket 4882 * layer. It is a normal data flow socket, that 4883 * can fork off new connections. Thus, we should 4884 * look into sol_qlen only in case we are !UDP. 4885 * 2) Checking sol_qlen in general requires locking 4886 * the socket, and this code lacks that. 4887 */ 4888 if ((stcb == NULL) && 4889 (!SCTP_IS_LISTENING(inp) || 4890 (!(inp->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE) && 4891 inp->sctp_socket->sol_qlen >= inp->sctp_socket->sol_qlimit))) { 4892 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 4893 (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) { 4894 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 4895 sctp_abort_association(inp, stcb, m, iphlen, 4896 src, dst, sh, op_err, 4897 mflowtype, mflowid, 4898 vrf_id, port); 4899 } 4900 *offset = length; 4901 return (NULL); 4902 } else { 4903 struct mbuf *ret_buf; 4904 struct sctp_inpcb *linp; 4905 struct sctp_tmit_chunk *chk; 4906 4907 if (stcb) { 4908 linp = NULL; 4909 } else { 4910 linp = inp; 4911 } 4912 4913 if (linp != NULL) { 4914 SCTP_ASOC_CREATE_LOCK(linp); 4915 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 4916 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) { 4917 SCTP_ASOC_CREATE_UNLOCK(linp); 4918 goto abend; 4919 } 4920 } 4921 4922 if (netp != NULL) { 4923 struct sctp_tcb *locked_stcb; 4924 4925 locked_stcb = stcb; 4926 ret_buf = 4927 sctp_handle_cookie_echo(m, iphlen, 4928 *offset, 4929 src, dst, 4930 sh, 4931 (struct sctp_cookie_echo_chunk *)ch, 4932 &inp, &stcb, netp, 4933 auth_skipped, 4934 auth_offset, 4935 auth_len, 4936 &locked_stcb, 4937 mflowtype, 4938 mflowid, 4939 vrf_id, 4940 port); 4941 if ((locked_stcb != NULL) && (locked_stcb != stcb)) { 4942 SCTP_TCB_UNLOCK(locked_stcb); 4943 } 4944 if (stcb != NULL) { 4945 SCTP_TCB_LOCK_ASSERT(stcb); 4946 } 4947 } else { 4948 ret_buf = NULL; 4949 } 4950 if (linp != NULL) { 4951 SCTP_ASOC_CREATE_UNLOCK(linp); 4952 } 4953 if (ret_buf == NULL) { 4954 if (stcb != NULL) { 4955 SCTP_TCB_UNLOCK(stcb); 4956 } 4957 SCTPDBG(SCTP_DEBUG_INPUT3, 4958 "GAK, null buffer\n"); 4959 *offset = length; 4960 return (NULL); 4961 } 4962 /* if AUTH skipped, see if it verified... */ 4963 if (auth_skipped) { 4964 got_auth = 1; 4965 auth_skipped = 0; 4966 } 4967 /* Restart the timer if we have pending data */ 4968 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 4969 if (chk->whoTo != NULL) { 4970 break; 4971 } 4972 } 4973 if (chk != NULL) { 4974 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 4975 } 4976 } 4977 break; 4978 case SCTP_COOKIE_ACK: 4979 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE_ACK, stcb %p\n", (void *)stcb); 4980 if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) { 4981 return (stcb); 4982 } 4983 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4984 /* We are not interested anymore */ 4985 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4986 ; 4987 } else if (stcb) { 4988 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 4989 SCTP_FROM_SCTP_INPUT + SCTP_LOC_30); 4990 *offset = length; 4991 return (NULL); 4992 } 4993 } 4994 if ((netp != NULL) && (*netp != NULL)) { 4995 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp); 4996 } 4997 break; 4998 case SCTP_ECN_ECHO: 4999 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_ECHO\n"); 5000 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) { 5001 /* Its not ours */ 5002 *offset = length; 5003 return (stcb); 5004 } 5005 if (stcb->asoc.ecn_supported == 0) { 5006 goto unknown_chunk; 5007 } 5008 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, stcb); 5009 ecne_seen = 1; 5010 break; 5011 case SCTP_ECN_CWR: 5012 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_CWR\n"); 5013 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) { 5014 *offset = length; 5015 return (stcb); 5016 } 5017 if (stcb->asoc.ecn_supported == 0) { 5018 goto unknown_chunk; 5019 } 5020 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp); 5021 break; 5022 case SCTP_SHUTDOWN_COMPLETE: 5023 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_COMPLETE, stcb %p\n", (void *)stcb); 5024 /* must be first and only chunk */ 5025 if ((num_chunks > 1) || 5026 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 5027 *offset = length; 5028 return (stcb); 5029 } 5030 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 5031 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch, 5032 stcb, *netp); 5033 } 5034 *offset = length; 5035 return (NULL); 5036 break; 5037 case SCTP_ASCONF: 5038 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n"); 5039 if (stcb != NULL) { 5040 if (stcb->asoc.asconf_supported == 0) { 5041 goto unknown_chunk; 5042 } 5043 sctp_handle_asconf(m, *offset, src, 5044 (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0); 5045 asconf_cnt++; 5046 } 5047 break; 5048 case SCTP_ASCONF_ACK: 5049 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF_ACK\n"); 5050 if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) { 5051 /* Its not ours */ 5052 *offset = length; 5053 return (stcb); 5054 } 5055 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 5056 if (stcb->asoc.asconf_supported == 0) { 5057 goto unknown_chunk; 5058 } 5059 /* He's alive so give him credit */ 5060 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5061 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5062 stcb->asoc.overall_error_count, 5063 0, 5064 SCTP_FROM_SCTP_INPUT, 5065 __LINE__); 5066 } 5067 stcb->asoc.overall_error_count = 0; 5068 sctp_handle_asconf_ack(m, *offset, 5069 (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock); 5070 if (abort_no_unlock) 5071 return (NULL); 5072 } 5073 break; 5074 case SCTP_FORWARD_CUM_TSN: 5075 case SCTP_IFORWARD_CUM_TSN: 5076 SCTPDBG(SCTP_DEBUG_INPUT3, "%s\n", 5077 ch->chunk_type == SCTP_FORWARD_CUM_TSN ? "FORWARD_TSN" : "I_FORWARD_TSN"); 5078 if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) { 5079 /* Its not ours */ 5080 *offset = length; 5081 return (stcb); 5082 } 5083 5084 if (stcb != NULL) { 5085 int abort_flag = 0; 5086 5087 if (stcb->asoc.prsctp_supported == 0) { 5088 goto unknown_chunk; 5089 } 5090 if (((stcb->asoc.idata_supported == 1) && (ch->chunk_type == SCTP_FORWARD_CUM_TSN)) || 5091 ((stcb->asoc.idata_supported == 0) && (ch->chunk_type == SCTP_IFORWARD_CUM_TSN))) { 5092 if (ch->chunk_type == SCTP_FORWARD_CUM_TSN) { 5093 SCTP_SNPRINTF(msg, sizeof(msg), "%s", "FORWARD-TSN chunk received when I-FORWARD-TSN was negotiated"); 5094 } else { 5095 SCTP_SNPRINTF(msg, sizeof(msg), "%s", "I-FORWARD-TSN chunk received when FORWARD-TSN was negotiated"); 5096 } 5097 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); 5098 sctp_abort_an_association(inp, stcb, op_err, SCTP_SO_NOT_LOCKED); 5099 *offset = length; 5100 return (NULL); 5101 } 5102 *fwd_tsn_seen = 1; 5103 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5104 /* We are not interested anymore */ 5105 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 5106 SCTP_FROM_SCTP_INPUT + SCTP_LOC_31); 5107 *offset = length; 5108 return (NULL); 5109 } 5110 /* 5111 * For sending a SACK this looks like DATA 5112 * chunks. 5113 */ 5114 stcb->asoc.last_data_chunk_from = stcb->asoc.last_control_chunk_from; 5115 sctp_handle_forward_tsn(stcb, 5116 (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset); 5117 if (abort_flag) { 5118 *offset = length; 5119 return (NULL); 5120 } 5121 } 5122 break; 5123 case SCTP_STREAM_RESET: 5124 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n"); 5125 if ((stcb == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req))) { 5126 /* Its not ours */ 5127 *offset = length; 5128 return (stcb); 5129 } 5130 if (stcb->asoc.reconfig_supported == 0) { 5131 goto unknown_chunk; 5132 } 5133 if (sctp_handle_stream_reset(stcb, m, *offset, ch)) { 5134 /* stop processing */ 5135 *offset = length; 5136 return (NULL); 5137 } 5138 break; 5139 case SCTP_PACKET_DROPPED: 5140 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n"); 5141 /* re-get it all please */ 5142 if (chk_length < sizeof(struct sctp_pktdrop_chunk)) { 5143 /* Its not ours */ 5144 *offset = length; 5145 return (stcb); 5146 } 5147 5148 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 5149 if (stcb->asoc.pktdrop_supported == 0) { 5150 goto unknown_chunk; 5151 } 5152 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch, 5153 stcb, *netp, 5154 min(chk_length, contiguous)); 5155 } 5156 break; 5157 case SCTP_AUTHENTICATION: 5158 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n"); 5159 if (stcb == NULL) { 5160 /* save the first AUTH for later processing */ 5161 if (auth_skipped == 0) { 5162 auth_offset = *offset; 5163 auth_len = chk_length; 5164 auth_skipped = 1; 5165 } 5166 /* skip this chunk (temporarily) */ 5167 goto next_chunk; 5168 } 5169 if (stcb->asoc.auth_supported == 0) { 5170 goto unknown_chunk; 5171 } 5172 if ((chk_length < (sizeof(struct sctp_auth_chunk))) || 5173 (chk_length > (sizeof(struct sctp_auth_chunk) + 5174 SCTP_AUTH_DIGEST_LEN_MAX))) { 5175 /* Its not ours */ 5176 *offset = length; 5177 return (stcb); 5178 } 5179 if (got_auth == 1) { 5180 /* skip this chunk... it's already auth'd */ 5181 goto next_chunk; 5182 } 5183 got_auth = 1; 5184 if (sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch, m, *offset)) { 5185 /* auth HMAC failed so dump the packet */ 5186 *offset = length; 5187 return (stcb); 5188 } else { 5189 /* remaining chunks are HMAC checked */ 5190 stcb->asoc.authenticated = 1; 5191 } 5192 break; 5193 5194 default: 5195 unknown_chunk: 5196 /* it's an unknown chunk! */ 5197 if ((ch->chunk_type & 0x40) && 5198 (stcb != NULL) && 5199 (SCTP_GET_STATE(stcb) != SCTP_STATE_EMPTY) && 5200 (SCTP_GET_STATE(stcb) != SCTP_STATE_INUSE) && 5201 (SCTP_GET_STATE(stcb) != SCTP_STATE_COOKIE_WAIT)) { 5202 struct sctp_gen_error_cause *cause; 5203 int len; 5204 5205 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_gen_error_cause), 5206 0, M_NOWAIT, 1, MT_DATA); 5207 if (op_err != NULL) { 5208 len = min(SCTP_SIZE32(chk_length), (uint32_t)(length - *offset)); 5209 cause = mtod(op_err, struct sctp_gen_error_cause *); 5210 cause->code = htons(SCTP_CAUSE_UNRECOG_CHUNK); 5211 cause->length = htons((uint16_t)(len + sizeof(struct sctp_gen_error_cause))); 5212 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_gen_error_cause); 5213 SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(m, *offset, len, M_NOWAIT); 5214 if (SCTP_BUF_NEXT(op_err) != NULL) { 5215 #ifdef SCTP_MBUF_LOGGING 5216 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5217 sctp_log_mbc(SCTP_BUF_NEXT(op_err), SCTP_MBUF_ICOPY); 5218 } 5219 #endif 5220 sctp_queue_op_err(stcb, op_err); 5221 } else { 5222 sctp_m_freem(op_err); 5223 } 5224 } 5225 } 5226 if ((ch->chunk_type & 0x80) == 0) { 5227 /* discard this packet */ 5228 *offset = length; 5229 return (stcb); 5230 } /* else skip this bad chunk and continue... */ 5231 break; 5232 } /* switch (ch->chunk_type) */ 5233 5234 next_chunk: 5235 /* get the next chunk */ 5236 *offset += SCTP_SIZE32(chk_length); 5237 if (*offset >= length) { 5238 /* no more data left in the mbuf chain */ 5239 break; 5240 } 5241 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 5242 sizeof(struct sctp_chunkhdr), chunk_buf); 5243 if (ch == NULL) { 5244 *offset = length; 5245 return (stcb); 5246 } 5247 } /* while */ 5248 5249 if ((asconf_cnt > 0) && (stcb != NULL)) { 5250 sctp_send_asconf_ack(stcb); 5251 } 5252 return (stcb); 5253 } 5254 5255 /* 5256 * common input chunk processing (v4 and v6) 5257 */ 5258 void 5259 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length, 5260 struct sockaddr *src, struct sockaddr *dst, 5261 struct sctphdr *sh, struct sctp_chunkhdr *ch, 5262 uint8_t compute_crc, 5263 uint8_t ecn_bits, 5264 uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum, 5265 uint32_t vrf_id, uint16_t port) 5266 { 5267 uint32_t high_tsn; 5268 int fwd_tsn_seen = 0, data_processed = 0; 5269 struct mbuf *m = *mm, *op_err; 5270 char msg[SCTP_DIAG_INFO_LEN]; 5271 int un_sent; 5272 int cnt_ctrl_ready = 0; 5273 struct sctp_inpcb *inp = NULL, *inp_decr = NULL; 5274 struct sctp_tcb *stcb = NULL; 5275 struct sctp_nets *net = NULL; 5276 5277 SCTP_STAT_INCR(sctps_recvdatagrams); 5278 #ifdef SCTP_AUDITING_ENABLED 5279 sctp_audit_log(0xE0, 1); 5280 sctp_auditing(0, inp, stcb, net); 5281 #endif 5282 if (compute_crc != 0) { 5283 uint32_t check, calc_check; 5284 5285 check = sh->checksum; 5286 sh->checksum = 0; 5287 calc_check = sctp_calculate_cksum(m, iphlen); 5288 sh->checksum = check; 5289 if (calc_check != check) { 5290 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x m:%p mlen:%d iphlen:%d\n", 5291 calc_check, check, (void *)m, length, iphlen); 5292 stcb = sctp_findassociation_addr(m, offset, src, dst, 5293 sh, ch, &inp, &net, vrf_id); 5294 #if defined(INET) || defined(INET6) 5295 if ((ch->chunk_type != SCTP_INITIATION) && 5296 (net != NULL) && (net->port != port)) { 5297 if (net->port == 0) { 5298 /* UDP encapsulation turned on. */ 5299 net->mtu -= sizeof(struct udphdr); 5300 if (stcb->asoc.smallest_mtu > net->mtu) { 5301 sctp_pathmtu_adjustment(stcb, net->mtu); 5302 } 5303 } else if (port == 0) { 5304 /* UDP encapsulation turned off. */ 5305 net->mtu += sizeof(struct udphdr); 5306 /* XXX Update smallest_mtu */ 5307 } 5308 net->port = port; 5309 } 5310 #endif 5311 if (net != NULL) { 5312 net->flowtype = mflowtype; 5313 net->flowid = mflowid; 5314 } 5315 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5316 if ((inp != NULL) && (stcb != NULL)) { 5317 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1); 5318 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED); 5319 } else if ((inp != NULL) && (stcb == NULL)) { 5320 inp_decr = inp; 5321 } 5322 SCTP_STAT_INCR(sctps_badsum); 5323 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors); 5324 goto out; 5325 } 5326 } 5327 /* Destination port of 0 is illegal, based on RFC4960. */ 5328 if (sh->dest_port == 0) { 5329 SCTP_STAT_INCR(sctps_hdrops); 5330 goto out; 5331 } 5332 stcb = sctp_findassociation_addr(m, offset, src, dst, 5333 sh, ch, &inp, &net, vrf_id); 5334 #if defined(INET) || defined(INET6) 5335 if ((ch->chunk_type != SCTP_INITIATION) && 5336 (net != NULL) && (net->port != port)) { 5337 if (net->port == 0) { 5338 /* UDP encapsulation turned on. */ 5339 net->mtu -= sizeof(struct udphdr); 5340 if (stcb->asoc.smallest_mtu > net->mtu) { 5341 sctp_pathmtu_adjustment(stcb, net->mtu); 5342 } 5343 } else if (port == 0) { 5344 /* UDP encapsulation turned off. */ 5345 net->mtu += sizeof(struct udphdr); 5346 /* XXX Update smallest_mtu */ 5347 } 5348 net->port = port; 5349 } 5350 #endif 5351 if (net != NULL) { 5352 net->flowtype = mflowtype; 5353 net->flowid = mflowid; 5354 } 5355 if (inp == NULL) { 5356 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5357 SCTP_STAT_INCR(sctps_noport); 5358 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) { 5359 goto out; 5360 } 5361 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 5362 sctp_send_shutdown_complete2(src, dst, sh, 5363 mflowtype, mflowid, fibnum, 5364 vrf_id, port); 5365 goto out; 5366 } 5367 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) { 5368 goto out; 5369 } 5370 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) { 5371 if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) || 5372 ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) && 5373 (ch->chunk_type != SCTP_INIT))) { 5374 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5375 "Out of the blue"); 5376 sctp_send_abort(m, iphlen, src, dst, 5377 sh, 0, op_err, 5378 mflowtype, mflowid, fibnum, 5379 vrf_id, port); 5380 } 5381 } 5382 goto out; 5383 } else if (stcb == NULL) { 5384 inp_decr = inp; 5385 } 5386 SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n", 5387 (void *)m, iphlen, offset, length, (void *)stcb); 5388 if (stcb) { 5389 /* always clear this before beginning a packet */ 5390 stcb->asoc.authenticated = 0; 5391 stcb->asoc.seen_a_sack_this_pkt = 0; 5392 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n", 5393 (void *)stcb, stcb->asoc.state); 5394 5395 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) || 5396 (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) { 5397 /*- 5398 * If we hit here, we had a ref count 5399 * up when the assoc was aborted and the 5400 * timer is clearing out the assoc, we should 5401 * NOT respond to any packet.. its OOTB. 5402 */ 5403 SCTP_TCB_UNLOCK(stcb); 5404 stcb = NULL; 5405 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5406 SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5407 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5408 msg); 5409 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5410 mflowtype, mflowid, inp->fibnum, 5411 vrf_id, port); 5412 goto out; 5413 } 5414 } 5415 if (IS_SCTP_CONTROL(ch)) { 5416 /* process the control portion of the SCTP packet */ 5417 /* sa_ignore NO_NULL_CHK */ 5418 stcb = sctp_process_control(m, iphlen, &offset, length, 5419 src, dst, sh, ch, 5420 inp, stcb, &net, &fwd_tsn_seen, 5421 mflowtype, mflowid, fibnum, 5422 vrf_id, port); 5423 if (stcb) { 5424 /* 5425 * This covers us if the cookie-echo was there and 5426 * it changes our INP. 5427 */ 5428 inp = stcb->sctp_ep; 5429 #if defined(INET) || defined(INET6) 5430 if ((ch->chunk_type != SCTP_INITIATION) && 5431 (net != NULL) && (net->port != port)) { 5432 if (net->port == 0) { 5433 /* UDP encapsulation turned on. */ 5434 net->mtu -= sizeof(struct udphdr); 5435 if (stcb->asoc.smallest_mtu > net->mtu) { 5436 sctp_pathmtu_adjustment(stcb, net->mtu); 5437 } 5438 } else if (port == 0) { 5439 /* UDP encapsulation turned off. */ 5440 net->mtu += sizeof(struct udphdr); 5441 /* XXX Update smallest_mtu */ 5442 } 5443 net->port = port; 5444 } 5445 #endif 5446 } 5447 } else { 5448 /* 5449 * no control chunks, so pre-process DATA chunks (these 5450 * checks are taken care of by control processing) 5451 */ 5452 5453 /* 5454 * if DATA only packet, and auth is required, then punt... 5455 * can't have authenticated without any AUTH (control) 5456 * chunks 5457 */ 5458 if ((stcb != NULL) && 5459 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) { 5460 /* "silently" ignore */ 5461 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5462 SCTP_STAT_INCR(sctps_recvauthmissing); 5463 goto out; 5464 } 5465 if (stcb == NULL) { 5466 /* out of the blue DATA chunk */ 5467 SCTP_PROBE5(receive, NULL, NULL, m, NULL, sh); 5468 SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5469 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5470 msg); 5471 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5472 mflowtype, mflowid, fibnum, 5473 vrf_id, port); 5474 goto out; 5475 } 5476 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) { 5477 /* v_tag mismatch! */ 5478 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5479 SCTP_STAT_INCR(sctps_badvtag); 5480 goto out; 5481 } 5482 } 5483 5484 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5485 if (stcb == NULL) { 5486 /* 5487 * no valid TCB for this packet, or we found it's a bad 5488 * packet while processing control, or we're done with this 5489 * packet (done or skip rest of data), so we drop it... 5490 */ 5491 goto out; 5492 } 5493 5494 /* 5495 * DATA chunk processing 5496 */ 5497 /* plow through the data chunks while length > offset */ 5498 5499 /* 5500 * Rest should be DATA only. Check authentication state if AUTH for 5501 * DATA is required. 5502 */ 5503 if ((length > offset) && 5504 (stcb != NULL) && 5505 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) && 5506 !stcb->asoc.authenticated) { 5507 /* "silently" ignore */ 5508 SCTP_STAT_INCR(sctps_recvauthmissing); 5509 SCTPDBG(SCTP_DEBUG_AUTH1, 5510 "Data chunk requires AUTH, skipped\n"); 5511 goto trigger_send; 5512 } 5513 if (length > offset) { 5514 int retval; 5515 5516 /* 5517 * First check to make sure our state is correct. We would 5518 * not get here unless we really did have a tag, so we don't 5519 * abort if this happens, just dump the chunk silently. 5520 */ 5521 switch (SCTP_GET_STATE(stcb)) { 5522 case SCTP_STATE_COOKIE_ECHOED: 5523 /* 5524 * we consider data with valid tags in this state 5525 * shows us the cookie-ack was lost. Imply it was 5526 * there. 5527 */ 5528 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net); 5529 break; 5530 case SCTP_STATE_COOKIE_WAIT: 5531 /* 5532 * We consider OOTB any data sent during asoc setup. 5533 */ 5534 SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5535 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5536 msg); 5537 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5538 mflowtype, mflowid, inp->fibnum, 5539 vrf_id, port); 5540 goto out; 5541 /* sa_ignore NOTREACHED */ 5542 break; 5543 case SCTP_STATE_EMPTY: /* should not happen */ 5544 case SCTP_STATE_INUSE: /* should not happen */ 5545 case SCTP_STATE_SHUTDOWN_RECEIVED: /* This is a peer error */ 5546 case SCTP_STATE_SHUTDOWN_ACK_SENT: 5547 default: 5548 goto out; 5549 /* sa_ignore NOTREACHED */ 5550 break; 5551 case SCTP_STATE_OPEN: 5552 case SCTP_STATE_SHUTDOWN_SENT: 5553 break; 5554 } 5555 /* plow through the data chunks while length > offset */ 5556 retval = sctp_process_data(mm, iphlen, &offset, length, 5557 inp, stcb, net, &high_tsn); 5558 if (retval == 2) { 5559 /* 5560 * The association aborted, NO UNLOCK needed since 5561 * the association is destroyed. 5562 */ 5563 stcb = NULL; 5564 goto out; 5565 } 5566 if (retval == 0) { 5567 data_processed = 1; 5568 } 5569 /* 5570 * Anything important needs to have been m_copy'ed in 5571 * process_data 5572 */ 5573 } 5574 5575 /* take care of ecn */ 5576 if ((data_processed == 1) && 5577 (stcb->asoc.ecn_supported == 1) && 5578 ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) { 5579 /* Yep, we need to add a ECNE */ 5580 sctp_send_ecn_echo(stcb, net, high_tsn); 5581 } 5582 5583 if ((data_processed == 0) && (fwd_tsn_seen)) { 5584 int was_a_gap; 5585 uint32_t highest_tsn; 5586 5587 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) { 5588 highest_tsn = stcb->asoc.highest_tsn_inside_nr_map; 5589 } else { 5590 highest_tsn = stcb->asoc.highest_tsn_inside_map; 5591 } 5592 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn); 5593 stcb->asoc.send_sack = 1; 5594 sctp_sack_check(stcb, was_a_gap); 5595 } else if (fwd_tsn_seen) { 5596 stcb->asoc.send_sack = 1; 5597 } 5598 /* trigger send of any chunks in queue... */ 5599 trigger_send: 5600 #ifdef SCTP_AUDITING_ENABLED 5601 sctp_audit_log(0xE0, 2); 5602 sctp_auditing(1, inp, stcb, net); 5603 #endif 5604 SCTPDBG(SCTP_DEBUG_INPUT1, 5605 "Check for chunk output prw:%d tqe:%d tf=%d\n", 5606 stcb->asoc.peers_rwnd, 5607 TAILQ_EMPTY(&stcb->asoc.control_send_queue), 5608 stcb->asoc.total_flight); 5609 un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight); 5610 if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 5611 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq; 5612 } 5613 if (!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue) || 5614 cnt_ctrl_ready || 5615 stcb->asoc.trigger_reset || 5616 ((un_sent > 0) && 5617 (stcb->asoc.peers_rwnd > 0 || stcb->asoc.total_flight == 0))) { 5618 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n"); 5619 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 5620 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n"); 5621 } 5622 #ifdef SCTP_AUDITING_ENABLED 5623 sctp_audit_log(0xE0, 3); 5624 sctp_auditing(2, inp, stcb, net); 5625 #endif 5626 out: 5627 if (stcb != NULL) { 5628 SCTP_TCB_UNLOCK(stcb); 5629 } 5630 if (inp_decr != NULL) { 5631 /* reduce ref-count */ 5632 SCTP_INP_WLOCK(inp_decr); 5633 SCTP_INP_DECR_REF(inp_decr); 5634 SCTP_INP_WUNLOCK(inp_decr); 5635 } 5636 return; 5637 } 5638 5639 #ifdef INET 5640 void 5641 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port) 5642 { 5643 struct mbuf *m; 5644 int iphlen; 5645 uint32_t vrf_id = 0; 5646 uint8_t ecn_bits; 5647 struct sockaddr_in src, dst; 5648 struct ip *ip; 5649 struct sctphdr *sh; 5650 struct sctp_chunkhdr *ch; 5651 int length, offset; 5652 uint8_t compute_crc; 5653 uint32_t mflowid; 5654 uint8_t mflowtype; 5655 uint16_t fibnum; 5656 5657 iphlen = off; 5658 if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) { 5659 SCTP_RELEASE_PKT(i_pak); 5660 return; 5661 } 5662 m = SCTP_HEADER_TO_CHAIN(i_pak); 5663 #ifdef SCTP_MBUF_LOGGING 5664 /* Log in any input mbufs */ 5665 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5666 sctp_log_mbc(m, SCTP_MBUF_INPUT); 5667 } 5668 #endif 5669 #ifdef SCTP_PACKET_LOGGING 5670 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) { 5671 sctp_packet_log(m); 5672 } 5673 #endif 5674 SCTPDBG(SCTP_DEBUG_CRCOFFLOAD, 5675 "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n", 5676 m->m_pkthdr.len, 5677 if_name(m->m_pkthdr.rcvif), 5678 (int)m->m_pkthdr.csum_flags, CSUM_BITS); 5679 mflowid = m->m_pkthdr.flowid; 5680 mflowtype = M_HASHTYPE_GET(m); 5681 fibnum = M_GETFIB(m); 5682 SCTP_STAT_INCR(sctps_recvpackets); 5683 SCTP_STAT_INCR_COUNTER64(sctps_inpackets); 5684 /* Get IP, SCTP, and first chunk header together in the first mbuf. */ 5685 offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr); 5686 if (SCTP_BUF_LEN(m) < offset) { 5687 if ((m = m_pullup(m, offset)) == NULL) { 5688 SCTP_STAT_INCR(sctps_hdrops); 5689 return; 5690 } 5691 } 5692 ip = mtod(m, struct ip *); 5693 sh = (struct sctphdr *)((caddr_t)ip + iphlen); 5694 ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr)); 5695 offset -= sizeof(struct sctp_chunkhdr); 5696 memset(&src, 0, sizeof(struct sockaddr_in)); 5697 src.sin_family = AF_INET; 5698 src.sin_len = sizeof(struct sockaddr_in); 5699 src.sin_port = sh->src_port; 5700 src.sin_addr = ip->ip_src; 5701 memset(&dst, 0, sizeof(struct sockaddr_in)); 5702 dst.sin_family = AF_INET; 5703 dst.sin_len = sizeof(struct sockaddr_in); 5704 dst.sin_port = sh->dest_port; 5705 dst.sin_addr = ip->ip_dst; 5706 length = ntohs(ip->ip_len); 5707 /* Validate mbuf chain length with IP payload length. */ 5708 if (SCTP_HEADER_LEN(m) != length) { 5709 SCTPDBG(SCTP_DEBUG_INPUT1, 5710 "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m)); 5711 SCTP_STAT_INCR(sctps_hdrops); 5712 goto out; 5713 } 5714 /* SCTP does not allow broadcasts or multicasts */ 5715 if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) { 5716 goto out; 5717 } 5718 if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) { 5719 goto out; 5720 } 5721 ecn_bits = ip->ip_tos; 5722 if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) { 5723 SCTP_STAT_INCR(sctps_recvhwcrc); 5724 compute_crc = 0; 5725 } else { 5726 SCTP_STAT_INCR(sctps_recvswcrc); 5727 compute_crc = 1; 5728 } 5729 sctp_common_input_processing(&m, iphlen, offset, length, 5730 (struct sockaddr *)&src, 5731 (struct sockaddr *)&dst, 5732 sh, ch, 5733 compute_crc, 5734 ecn_bits, 5735 mflowtype, mflowid, fibnum, 5736 vrf_id, port); 5737 out: 5738 if (m) { 5739 sctp_m_freem(m); 5740 } 5741 return; 5742 } 5743 5744 #if defined(SCTP_MCORE_INPUT) && defined(SMP) 5745 extern int *sctp_cpuarry; 5746 #endif 5747 5748 int 5749 sctp_input(struct mbuf **mp, int *offp, int proto SCTP_UNUSED) 5750 { 5751 struct mbuf *m; 5752 int off; 5753 5754 m = *mp; 5755 off = *offp; 5756 #if defined(SCTP_MCORE_INPUT) && defined(SMP) 5757 if (mp_ncpus > 1) { 5758 struct ip *ip; 5759 struct sctphdr *sh; 5760 int offset; 5761 int cpu_to_use; 5762 uint32_t flowid, tag; 5763 5764 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) { 5765 flowid = m->m_pkthdr.flowid; 5766 } else { 5767 /* 5768 * No flow id built by lower layers fix it so we 5769 * create one. 5770 */ 5771 offset = off + sizeof(struct sctphdr); 5772 if (SCTP_BUF_LEN(m) < offset) { 5773 if ((m = m_pullup(m, offset)) == NULL) { 5774 SCTP_STAT_INCR(sctps_hdrops); 5775 return (IPPROTO_DONE); 5776 } 5777 } 5778 ip = mtod(m, struct ip *); 5779 sh = (struct sctphdr *)((caddr_t)ip + off); 5780 tag = htonl(sh->v_tag); 5781 flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port); 5782 m->m_pkthdr.flowid = flowid; 5783 M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE_HASH); 5784 } 5785 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus]; 5786 sctp_queue_to_mcore(m, off, cpu_to_use); 5787 return (IPPROTO_DONE); 5788 } 5789 #endif 5790 sctp_input_with_port(m, off, 0); 5791 return (IPPROTO_DONE); 5792 } 5793 #endif 5794