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 asoc->cookie_preserve_req = ntohl(stale_cookie->stale_time); 1168 /* Double it to be more robust on RTX */ 1169 if (asoc->cookie_preserve_req <= UINT32_MAX / 2) { 1170 asoc->cookie_preserve_req *= 2; 1171 } else { 1172 asoc->cookie_preserve_req = UINT32_MAX; 1173 } 1174 asoc->stale_cookie_count++; 1175 if (asoc->stale_cookie_count > 1176 asoc->max_init_times) { 1177 sctp_abort_notification(stcb, 0, 0, NULL, SCTP_SO_NOT_LOCKED); 1178 /* now free the asoc */ 1179 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1180 SCTP_FROM_SCTP_INPUT + SCTP_LOC_12); 1181 return (-1); 1182 } 1183 /* blast back to INIT state */ 1184 sctp_toss_old_cookies(stcb, &stcb->asoc); 1185 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT); 1186 sctp_stop_all_cookie_timers(stcb); 1187 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 1188 } 1189 break; 1190 case SCTP_CAUSE_UNRESOLVABLE_ADDR: 1191 /* 1192 * Nothing we can do here, we don't do hostname 1193 * addresses so if the peer does not like my IPv6 1194 * (or IPv4 for that matter) it does not matter. If 1195 * they don't support that type of address, they can 1196 * NOT possibly get that packet type... i.e. with no 1197 * IPv6 you can't receive a IPv6 packet. so we can 1198 * safely ignore this one. If we ever added support 1199 * for HOSTNAME Addresses, then we would need to do 1200 * something here. 1201 */ 1202 break; 1203 case SCTP_CAUSE_UNRECOG_CHUNK: 1204 if (cause_length >= sizeof(struct sctp_error_unrecognized_chunk)) { 1205 struct sctp_error_unrecognized_chunk *unrec_chunk; 1206 1207 unrec_chunk = (struct sctp_error_unrecognized_chunk *)cause; 1208 sctp_process_unrecog_chunk(stcb, unrec_chunk->ch.chunk_type); 1209 } 1210 break; 1211 case SCTP_CAUSE_UNRECOG_PARAM: 1212 /* XXX: We only consider the first parameter */ 1213 if (cause_length >= sizeof(struct sctp_error_cause) + sizeof(struct sctp_paramhdr)) { 1214 struct sctp_paramhdr *unrec_parameter; 1215 1216 unrec_parameter = (struct sctp_paramhdr *)(cause + 1); 1217 sctp_process_unrecog_param(stcb, ntohs(unrec_parameter->param_type)); 1218 } 1219 break; 1220 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN: 1221 /* 1222 * We ignore this since the timer will drive out a 1223 * new cookie anyway and there timer will drive us 1224 * to send a SHUTDOWN_COMPLETE. We can't send one 1225 * here since we don't have their tag. 1226 */ 1227 break; 1228 case SCTP_CAUSE_DELETING_LAST_ADDR: 1229 case SCTP_CAUSE_RESOURCE_SHORTAGE: 1230 case SCTP_CAUSE_DELETING_SRC_ADDR: 1231 /* 1232 * We should NOT get these here, but in a 1233 * ASCONF-ACK. 1234 */ 1235 SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a error cause with code %u.\n", 1236 cause_code); 1237 break; 1238 case SCTP_CAUSE_OUT_OF_RESC: 1239 /* 1240 * And what, pray tell do we do with the fact that 1241 * the peer is out of resources? Not really sure we 1242 * could do anything but abort. I suspect this 1243 * should have came WITH an abort instead of in a 1244 * OP-ERROR. 1245 */ 1246 break; 1247 default: 1248 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown code 0x%x\n", 1249 cause_code); 1250 break; 1251 } 1252 adjust = SCTP_SIZE32(cause_length); 1253 if (remaining_length >= adjust) { 1254 remaining_length -= adjust; 1255 } else { 1256 remaining_length = 0; 1257 } 1258 cause = (struct sctp_error_cause *)((caddr_t)cause + adjust); 1259 } 1260 sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, code, ch, SCTP_SO_NOT_LOCKED); 1261 return (0); 1262 } 1263 1264 static int 1265 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset, 1266 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 1267 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 1268 struct sctp_nets *net, int *abort_no_unlock, 1269 uint8_t mflowtype, uint32_t mflowid, 1270 uint32_t vrf_id) 1271 { 1272 struct sctp_init_ack *init_ack; 1273 struct mbuf *op_err; 1274 1275 SCTPDBG(SCTP_DEBUG_INPUT2, 1276 "sctp_handle_init_ack: handling INIT-ACK\n"); 1277 1278 if (stcb == NULL) { 1279 SCTPDBG(SCTP_DEBUG_INPUT2, 1280 "sctp_handle_init_ack: TCB is null\n"); 1281 return (-1); 1282 } 1283 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) { 1284 /* Invalid length */ 1285 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1286 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1287 src, dst, sh, op_err, 1288 mflowtype, mflowid, 1289 vrf_id, net->port); 1290 *abort_no_unlock = 1; 1291 return (-1); 1292 } 1293 init_ack = &cp->init; 1294 /* validate parameters */ 1295 if (init_ack->initiate_tag == 0) { 1296 /* protocol error... send an abort */ 1297 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1298 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1299 src, dst, sh, op_err, 1300 mflowtype, mflowid, 1301 vrf_id, net->port); 1302 *abort_no_unlock = 1; 1303 return (-1); 1304 } 1305 if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) { 1306 /* protocol error... send an abort */ 1307 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1308 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1309 src, dst, sh, op_err, 1310 mflowtype, mflowid, 1311 vrf_id, net->port); 1312 *abort_no_unlock = 1; 1313 return (-1); 1314 } 1315 if (init_ack->num_inbound_streams == 0) { 1316 /* protocol error... send an abort */ 1317 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1318 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1319 src, dst, sh, op_err, 1320 mflowtype, mflowid, 1321 vrf_id, net->port); 1322 *abort_no_unlock = 1; 1323 return (-1); 1324 } 1325 if (init_ack->num_outbound_streams == 0) { 1326 /* protocol error... send an abort */ 1327 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1328 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1329 src, dst, sh, op_err, 1330 mflowtype, mflowid, 1331 vrf_id, net->port); 1332 *abort_no_unlock = 1; 1333 return (-1); 1334 } 1335 /* process according to association state... */ 1336 switch (SCTP_GET_STATE(stcb)) { 1337 case SCTP_STATE_COOKIE_WAIT: 1338 /* this is the expected state for this chunk */ 1339 /* process the INIT-ACK parameters */ 1340 if (stcb->asoc.primary_destination->dest_state & 1341 SCTP_ADDR_UNCONFIRMED) { 1342 /* 1343 * The primary is where we sent the INIT, we can 1344 * always consider it confirmed when the INIT-ACK is 1345 * returned. Do this before we load addresses 1346 * though. 1347 */ 1348 stcb->asoc.primary_destination->dest_state &= 1349 ~SCTP_ADDR_UNCONFIRMED; 1350 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 1351 stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED); 1352 } 1353 if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb, 1354 net, abort_no_unlock, 1355 mflowtype, mflowid, 1356 vrf_id) < 0) { 1357 /* error in parsing parameters */ 1358 return (-1); 1359 } 1360 /* update our state */ 1361 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n"); 1362 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_ECHOED); 1363 1364 /* reset the RTO calc */ 1365 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 1366 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 1367 stcb->asoc.overall_error_count, 1368 0, 1369 SCTP_FROM_SCTP_INPUT, 1370 __LINE__); 1371 } 1372 stcb->asoc.overall_error_count = 0; 1373 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 1374 /* 1375 * collapse the init timer back in case of a exponential 1376 * backoff 1377 */ 1378 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep, 1379 stcb, net); 1380 /* 1381 * the send at the end of the inbound data processing will 1382 * cause the cookie to be sent 1383 */ 1384 break; 1385 case SCTP_STATE_SHUTDOWN_SENT: 1386 /* incorrect state... discard */ 1387 break; 1388 case SCTP_STATE_COOKIE_ECHOED: 1389 /* incorrect state... discard */ 1390 break; 1391 case SCTP_STATE_OPEN: 1392 /* incorrect state... discard */ 1393 break; 1394 case SCTP_STATE_EMPTY: 1395 case SCTP_STATE_INUSE: 1396 default: 1397 /* incorrect state... discard */ 1398 return (-1); 1399 break; 1400 } 1401 SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n"); 1402 return (0); 1403 } 1404 1405 static struct sctp_tcb * 1406 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1407 struct sockaddr *src, struct sockaddr *dst, 1408 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1409 struct sctp_inpcb *inp, struct sctp_nets **netp, 1410 struct sockaddr *init_src, int *notification, 1411 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1412 uint8_t mflowtype, uint32_t mflowid, 1413 uint32_t vrf_id, uint16_t port); 1414 1415 /* 1416 * handle a state cookie for an existing association m: input packet mbuf 1417 * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a 1418 * "split" mbuf and the cookie signature does not exist offset: offset into 1419 * mbuf to the cookie-echo chunk 1420 */ 1421 static struct sctp_tcb * 1422 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset, 1423 struct sockaddr *src, struct sockaddr *dst, 1424 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1425 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp, 1426 struct sockaddr *init_src, int *notification, 1427 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1428 uint8_t mflowtype, uint32_t mflowid, 1429 uint32_t vrf_id, uint16_t port) 1430 { 1431 struct sctp_association *asoc; 1432 struct sctp_init_chunk *init_cp, init_buf; 1433 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1434 struct sctp_nets *net; 1435 struct mbuf *op_err; 1436 struct timeval old; 1437 int init_offset, initack_offset, i; 1438 int retval; 1439 int spec_flag = 0; 1440 uint32_t how_indx; 1441 #if defined(SCTP_DETAILED_STR_STATS) 1442 int j; 1443 #endif 1444 1445 net = *netp; 1446 /* I know that the TCB is non-NULL from the caller */ 1447 asoc = &stcb->asoc; 1448 for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) { 1449 if (asoc->cookie_how[how_indx] == 0) 1450 break; 1451 } 1452 if (how_indx < sizeof(asoc->cookie_how)) { 1453 asoc->cookie_how[how_indx] = 1; 1454 } 1455 if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 1456 /* SHUTDOWN came in after sending INIT-ACK */ 1457 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination); 1458 op_err = sctp_generate_cause(SCTP_CAUSE_COOKIE_IN_SHUTDOWN, ""); 1459 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 1460 mflowtype, mflowid, inp->fibnum, 1461 vrf_id, net->port); 1462 if (how_indx < sizeof(asoc->cookie_how)) 1463 asoc->cookie_how[how_indx] = 2; 1464 return (NULL); 1465 } 1466 /* 1467 * find and validate the INIT chunk in the cookie (peer's info) the 1468 * INIT should start after the cookie-echo header struct (chunk 1469 * header, state cookie header struct) 1470 */ 1471 init_offset = offset += sizeof(struct sctp_cookie_echo_chunk); 1472 1473 init_cp = (struct sctp_init_chunk *) 1474 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 1475 (uint8_t *)&init_buf); 1476 if (init_cp == NULL) { 1477 /* could not pull a INIT chunk in cookie */ 1478 return (NULL); 1479 } 1480 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 1481 return (NULL); 1482 } 1483 /* 1484 * find and validate the INIT-ACK chunk in the cookie (my info) the 1485 * INIT-ACK follows the INIT chunk 1486 */ 1487 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 1488 initack_cp = (struct sctp_init_ack_chunk *) 1489 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 1490 (uint8_t *)&initack_buf); 1491 if (initack_cp == NULL) { 1492 /* could not pull INIT-ACK chunk in cookie */ 1493 return (NULL); 1494 } 1495 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 1496 return (NULL); 1497 } 1498 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1499 (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) { 1500 /* 1501 * case D in Section 5.2.4 Table 2: MMAA process accordingly 1502 * to get into the OPEN state 1503 */ 1504 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1505 /*- 1506 * Opps, this means that we somehow generated two vtag's 1507 * the same. I.e. we did: 1508 * Us Peer 1509 * <---INIT(tag=a)------ 1510 * ----INIT-ACK(tag=t)--> 1511 * ----INIT(tag=t)------> *1 1512 * <---INIT-ACK(tag=a)--- 1513 * <----CE(tag=t)------------- *2 1514 * 1515 * At point *1 we should be generating a different 1516 * tag t'. Which means we would throw away the CE and send 1517 * ours instead. Basically this is case C (throw away side). 1518 */ 1519 if (how_indx < sizeof(asoc->cookie_how)) 1520 asoc->cookie_how[how_indx] = 17; 1521 return (NULL); 1522 } 1523 switch (SCTP_GET_STATE(stcb)) { 1524 case SCTP_STATE_COOKIE_WAIT: 1525 case SCTP_STATE_COOKIE_ECHOED: 1526 /* 1527 * INIT was sent but got a COOKIE_ECHO with the 1528 * correct tags... just accept it...but we must 1529 * process the init so that we can make sure we have 1530 * the right seq no's. 1531 */ 1532 /* First we must process the INIT !! */ 1533 retval = sctp_process_init(init_cp, stcb); 1534 if (retval < 0) { 1535 if (how_indx < sizeof(asoc->cookie_how)) 1536 asoc->cookie_how[how_indx] = 3; 1537 return (NULL); 1538 } 1539 /* we have already processed the INIT so no problem */ 1540 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, 1541 stcb, net, 1542 SCTP_FROM_SCTP_INPUT + SCTP_LOC_13); 1543 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, 1544 stcb, net, 1545 SCTP_FROM_SCTP_INPUT + SCTP_LOC_14); 1546 /* update current state */ 1547 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) 1548 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1549 else 1550 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1551 1552 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 1553 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1554 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1555 stcb->sctp_ep, stcb, NULL); 1556 } 1557 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1558 sctp_stop_all_cookie_timers(stcb); 1559 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1560 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1561 (!SCTP_IS_LISTENING(inp))) { 1562 /* 1563 * Here is where collision would go if we 1564 * did a connect() and instead got a 1565 * init/init-ack/cookie done before the 1566 * init-ack came back.. 1567 */ 1568 stcb->sctp_ep->sctp_flags |= 1569 SCTP_PCB_FLAGS_CONNECTED; 1570 soisconnected(stcb->sctp_socket); 1571 } 1572 /* notify upper layer */ 1573 *notification = SCTP_NOTIFY_ASSOC_UP; 1574 /* 1575 * since we did not send a HB make sure we don't 1576 * double things 1577 */ 1578 old.tv_sec = cookie->time_entered.tv_sec; 1579 old.tv_usec = cookie->time_entered.tv_usec; 1580 net->hb_responded = 1; 1581 sctp_calculate_rto(stcb, asoc, net, &old, 1582 SCTP_RTT_FROM_NON_DATA); 1583 1584 if (stcb->asoc.sctp_autoclose_ticks && 1585 (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) { 1586 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 1587 inp, stcb, NULL); 1588 } 1589 break; 1590 default: 1591 /* 1592 * we're in the OPEN state (or beyond), so peer must 1593 * have simply lost the COOKIE-ACK 1594 */ 1595 break; 1596 } /* end switch */ 1597 sctp_stop_all_cookie_timers(stcb); 1598 /* 1599 * We ignore the return code here.. not sure if we should 1600 * somehow abort.. but we do have an existing asoc. This 1601 * really should not fail. 1602 */ 1603 if (sctp_load_addresses_from_init(stcb, m, 1604 init_offset + sizeof(struct sctp_init_chunk), 1605 initack_offset, src, dst, init_src, stcb->asoc.port)) { 1606 if (how_indx < sizeof(asoc->cookie_how)) 1607 asoc->cookie_how[how_indx] = 4; 1608 return (NULL); 1609 } 1610 /* respond with a COOKIE-ACK */ 1611 sctp_toss_old_cookies(stcb, asoc); 1612 sctp_send_cookie_ack(stcb); 1613 if (how_indx < sizeof(asoc->cookie_how)) 1614 asoc->cookie_how[how_indx] = 5; 1615 return (stcb); 1616 } 1617 1618 if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1619 ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag && 1620 cookie->tie_tag_my_vtag == 0 && 1621 cookie->tie_tag_peer_vtag == 0) { 1622 /* 1623 * case C in Section 5.2.4 Table 2: XMOO silently discard 1624 */ 1625 if (how_indx < sizeof(asoc->cookie_how)) 1626 asoc->cookie_how[how_indx] = 6; 1627 return (NULL); 1628 } 1629 /* 1630 * If nat support, and the below and stcb is established, send back 1631 * a ABORT(colliding state) if we are established. 1632 */ 1633 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) && 1634 (asoc->peer_supports_nat) && 1635 ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1636 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1637 (asoc->peer_vtag == 0)))) { 1638 /* 1639 * Special case - Peer's support nat. We may have two init's 1640 * that we gave out the same tag on since one was not 1641 * established.. i.e. we get INIT from host-1 behind the nat 1642 * and we respond tag-a, we get a INIT from host-2 behind 1643 * the nat and we get tag-a again. Then we bring up host-1 1644 * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1). 1645 * Now we have colliding state. We must send an abort here 1646 * with colliding state indication. 1647 */ 1648 op_err = sctp_generate_cause(SCTP_CAUSE_NAT_COLLIDING_STATE, ""); 1649 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err, 1650 mflowtype, mflowid, inp->fibnum, 1651 vrf_id, port); 1652 return (NULL); 1653 } 1654 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1655 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1656 (asoc->peer_vtag == 0))) { 1657 /* 1658 * case B in Section 5.2.4 Table 2: MXAA or MOAA my info 1659 * should be ok, re-accept peer info 1660 */ 1661 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1662 /* 1663 * Extension of case C. If we hit this, then the 1664 * random number generator returned the same vtag 1665 * when we first sent our INIT-ACK and when we later 1666 * sent our INIT. The side with the seq numbers that 1667 * are different will be the one that normnally 1668 * would have hit case C. This in effect "extends" 1669 * our vtags in this collision case to be 64 bits. 1670 * The same collision could occur aka you get both 1671 * vtag and seq number the same twice in a row.. but 1672 * is much less likely. If it did happen then we 1673 * would proceed through and bring up the assoc.. we 1674 * may end up with the wrong stream setup however.. 1675 * which would be bad.. but there is no way to 1676 * tell.. until we send on a stream that does not 1677 * exist :-) 1678 */ 1679 if (how_indx < sizeof(asoc->cookie_how)) 1680 asoc->cookie_how[how_indx] = 7; 1681 1682 return (NULL); 1683 } 1684 if (how_indx < sizeof(asoc->cookie_how)) 1685 asoc->cookie_how[how_indx] = 8; 1686 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, 1687 SCTP_FROM_SCTP_INPUT + SCTP_LOC_15); 1688 sctp_stop_all_cookie_timers(stcb); 1689 /* 1690 * since we did not send a HB make sure we don't double 1691 * things 1692 */ 1693 net->hb_responded = 1; 1694 if (stcb->asoc.sctp_autoclose_ticks && 1695 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 1696 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, 1697 NULL); 1698 } 1699 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1700 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 1701 1702 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) { 1703 /* 1704 * Ok the peer probably discarded our data (if we 1705 * echoed a cookie+data). So anything on the 1706 * sent_queue should be marked for retransmit, we 1707 * may not get something to kick us so it COULD 1708 * still take a timeout to move these.. but it can't 1709 * hurt to mark them. 1710 */ 1711 struct sctp_tmit_chunk *chk; 1712 1713 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 1714 if (chk->sent < SCTP_DATAGRAM_RESEND) { 1715 chk->sent = SCTP_DATAGRAM_RESEND; 1716 sctp_flight_size_decrease(chk); 1717 sctp_total_flight_decrease(stcb, chk); 1718 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 1719 spec_flag++; 1720 } 1721 } 1722 } 1723 /* process the INIT info (peer's info) */ 1724 retval = sctp_process_init(init_cp, stcb); 1725 if (retval < 0) { 1726 if (how_indx < sizeof(asoc->cookie_how)) 1727 asoc->cookie_how[how_indx] = 9; 1728 return (NULL); 1729 } 1730 if (sctp_load_addresses_from_init(stcb, m, 1731 init_offset + sizeof(struct sctp_init_chunk), 1732 initack_offset, src, dst, init_src, stcb->asoc.port)) { 1733 if (how_indx < sizeof(asoc->cookie_how)) 1734 asoc->cookie_how[how_indx] = 10; 1735 return (NULL); 1736 } 1737 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || 1738 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 1739 *notification = SCTP_NOTIFY_ASSOC_UP; 1740 1741 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1742 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1743 (!SCTP_IS_LISTENING(inp))) { 1744 stcb->sctp_ep->sctp_flags |= 1745 SCTP_PCB_FLAGS_CONNECTED; 1746 soisconnected(stcb->sctp_socket); 1747 } 1748 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) 1749 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1750 else 1751 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1752 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1753 } else if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) { 1754 SCTP_STAT_INCR_COUNTER32(sctps_restartestab); 1755 } else { 1756 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1757 } 1758 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 1759 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1760 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1761 stcb->sctp_ep, stcb, NULL); 1762 } 1763 sctp_stop_all_cookie_timers(stcb); 1764 sctp_toss_old_cookies(stcb, asoc); 1765 sctp_send_cookie_ack(stcb); 1766 if (spec_flag) { 1767 /* 1768 * only if we have retrans set do we do this. What 1769 * this call does is get only the COOKIE-ACK out and 1770 * then when we return the normal call to 1771 * sctp_chunk_output will get the retrans out behind 1772 * this. 1773 */ 1774 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED); 1775 } 1776 if (how_indx < sizeof(asoc->cookie_how)) 1777 asoc->cookie_how[how_indx] = 11; 1778 1779 return (stcb); 1780 } 1781 if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1782 ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) && 1783 cookie->tie_tag_my_vtag == asoc->my_vtag_nonce && 1784 cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce && 1785 cookie->tie_tag_peer_vtag != 0) { 1786 struct sctpasochead *head; 1787 1788 if (asoc->peer_supports_nat) { 1789 /* 1790 * This is a gross gross hack. Just call the 1791 * cookie_new code since we are allowing a duplicate 1792 * association. I hope this works... 1793 */ 1794 return (sctp_process_cookie_new(m, iphlen, offset, src, dst, 1795 sh, cookie, cookie_len, 1796 inp, netp, init_src, notification, 1797 auth_skipped, auth_offset, auth_len, 1798 mflowtype, mflowid, 1799 vrf_id, port)); 1800 } 1801 /* 1802 * case A in Section 5.2.4 Table 2: XXMM (peer restarted) 1803 */ 1804 /* temp code */ 1805 if (how_indx < sizeof(asoc->cookie_how)) 1806 asoc->cookie_how[how_indx] = 12; 1807 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, 1808 SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 1809 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, 1810 SCTP_FROM_SCTP_INPUT + SCTP_LOC_17); 1811 1812 /* notify upper layer */ 1813 *notification = SCTP_NOTIFY_ASSOC_RESTART; 1814 atomic_add_int(&stcb->asoc.refcnt, 1); 1815 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_OPEN) && 1816 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) && 1817 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT)) { 1818 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1819 } 1820 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) { 1821 SCTP_STAT_INCR_GAUGE32(sctps_restartestab); 1822 } else if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) { 1823 SCTP_STAT_INCR_GAUGE32(sctps_collisionestab); 1824 } 1825 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1826 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 1827 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1828 stcb->sctp_ep, stcb, NULL); 1829 1830 } else if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) { 1831 /* move to OPEN state, if not in SHUTDOWN_SENT */ 1832 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 1833 } 1834 asoc->pre_open_streams = 1835 ntohs(initack_cp->init.num_outbound_streams); 1836 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 1837 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 1838 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 1839 1840 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 1841 1842 asoc->str_reset_seq_in = asoc->init_seq_number; 1843 1844 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 1845 if (asoc->mapping_array) { 1846 memset(asoc->mapping_array, 0, 1847 asoc->mapping_array_size); 1848 } 1849 if (asoc->nr_mapping_array) { 1850 memset(asoc->nr_mapping_array, 0, 1851 asoc->mapping_array_size); 1852 } 1853 SCTP_TCB_UNLOCK(stcb); 1854 SCTP_INP_INFO_WLOCK(); 1855 SCTP_INP_WLOCK(stcb->sctp_ep); 1856 SCTP_TCB_LOCK(stcb); 1857 atomic_add_int(&stcb->asoc.refcnt, -1); 1858 /* send up all the data */ 1859 SCTP_TCB_SEND_LOCK(stcb); 1860 1861 sctp_report_all_outbound(stcb, 0, SCTP_SO_LOCKED); 1862 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 1863 stcb->asoc.strmout[i].chunks_on_queues = 0; 1864 #if defined(SCTP_DETAILED_STR_STATS) 1865 for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) { 1866 asoc->strmout[i].abandoned_sent[j] = 0; 1867 asoc->strmout[i].abandoned_unsent[j] = 0; 1868 } 1869 #else 1870 asoc->strmout[i].abandoned_sent[0] = 0; 1871 asoc->strmout[i].abandoned_unsent[0] = 0; 1872 #endif 1873 stcb->asoc.strmout[i].sid = i; 1874 stcb->asoc.strmout[i].next_mid_ordered = 0; 1875 stcb->asoc.strmout[i].next_mid_unordered = 0; 1876 stcb->asoc.strmout[i].last_msg_incomplete = 0; 1877 } 1878 /* process the INIT-ACK info (my info) */ 1879 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 1880 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1881 1882 /* pull from vtag hash */ 1883 LIST_REMOVE(stcb, sctp_asocs); 1884 /* re-insert to new vtag position */ 1885 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, 1886 SCTP_BASE_INFO(hashasocmark))]; 1887 /* 1888 * put it in the bucket in the vtag hash of assoc's for the 1889 * system 1890 */ 1891 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 1892 1893 SCTP_TCB_SEND_UNLOCK(stcb); 1894 SCTP_INP_WUNLOCK(stcb->sctp_ep); 1895 SCTP_INP_INFO_WUNLOCK(); 1896 asoc->total_flight = 0; 1897 asoc->total_flight_count = 0; 1898 /* process the INIT info (peer's info) */ 1899 retval = sctp_process_init(init_cp, stcb); 1900 if (retval < 0) { 1901 if (how_indx < sizeof(asoc->cookie_how)) 1902 asoc->cookie_how[how_indx] = 13; 1903 1904 return (NULL); 1905 } 1906 /* 1907 * since we did not send a HB make sure we don't double 1908 * things 1909 */ 1910 net->hb_responded = 1; 1911 1912 if (sctp_load_addresses_from_init(stcb, m, 1913 init_offset + sizeof(struct sctp_init_chunk), 1914 initack_offset, src, dst, init_src, stcb->asoc.port)) { 1915 if (how_indx < sizeof(asoc->cookie_how)) 1916 asoc->cookie_how[how_indx] = 14; 1917 1918 return (NULL); 1919 } 1920 /* respond with a COOKIE-ACK */ 1921 sctp_stop_all_cookie_timers(stcb); 1922 sctp_toss_old_cookies(stcb, asoc); 1923 sctp_send_cookie_ack(stcb); 1924 if (how_indx < sizeof(asoc->cookie_how)) 1925 asoc->cookie_how[how_indx] = 15; 1926 1927 return (stcb); 1928 } 1929 if (how_indx < sizeof(asoc->cookie_how)) 1930 asoc->cookie_how[how_indx] = 16; 1931 /* all other cases... */ 1932 return (NULL); 1933 } 1934 1935 /* 1936 * handle a state cookie for a new association m: input packet mbuf chain-- 1937 * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf 1938 * and the cookie signature does not exist offset: offset into mbuf to the 1939 * cookie-echo chunk length: length of the cookie chunk to: where the init 1940 * was from returns a new TCB 1941 */ 1942 static struct sctp_tcb * 1943 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1944 struct sockaddr *src, struct sockaddr *dst, 1945 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1946 struct sctp_inpcb *inp, struct sctp_nets **netp, 1947 struct sockaddr *init_src, int *notification, 1948 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1949 uint8_t mflowtype, uint32_t mflowid, 1950 uint32_t vrf_id, uint16_t port) 1951 { 1952 struct sctp_tcb *stcb; 1953 struct sctp_init_chunk *init_cp, init_buf; 1954 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1955 union sctp_sockstore store; 1956 struct sctp_association *asoc; 1957 int init_offset, initack_offset, initack_limit; 1958 int retval; 1959 int error = 0; 1960 uint8_t auth_chunk_buf[SCTP_CHUNK_BUFFER_SIZE]; 1961 1962 /* 1963 * find and validate the INIT chunk in the cookie (peer's info) the 1964 * INIT should start after the cookie-echo header struct (chunk 1965 * header, state cookie header struct) 1966 */ 1967 init_offset = offset + sizeof(struct sctp_cookie_echo_chunk); 1968 init_cp = (struct sctp_init_chunk *) 1969 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 1970 (uint8_t *)&init_buf); 1971 if (init_cp == NULL) { 1972 /* could not pull a INIT chunk in cookie */ 1973 SCTPDBG(SCTP_DEBUG_INPUT1, 1974 "process_cookie_new: could not pull INIT chunk hdr\n"); 1975 return (NULL); 1976 } 1977 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 1978 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n"); 1979 return (NULL); 1980 } 1981 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 1982 /* 1983 * find and validate the INIT-ACK chunk in the cookie (my info) the 1984 * INIT-ACK follows the INIT chunk 1985 */ 1986 initack_cp = (struct sctp_init_ack_chunk *) 1987 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 1988 (uint8_t *)&initack_buf); 1989 if (initack_cp == NULL) { 1990 /* could not pull INIT-ACK chunk in cookie */ 1991 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n"); 1992 return (NULL); 1993 } 1994 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 1995 return (NULL); 1996 } 1997 /* 1998 * NOTE: We can't use the INIT_ACK's chk_length to determine the 1999 * "initack_limit" value. This is because the chk_length field 2000 * includes the length of the cookie, but the cookie is omitted when 2001 * the INIT and INIT_ACK are tacked onto the cookie... 2002 */ 2003 initack_limit = offset + cookie_len; 2004 2005 /* 2006 * now that we know the INIT/INIT-ACK are in place, create a new TCB 2007 * and popluate 2008 */ 2009 2010 /* 2011 * Here we do a trick, we set in NULL for the proc/thread argument. 2012 * We do this since in effect we only use the p argument when the 2013 * socket is unbound and we must do an implicit bind. Since we are 2014 * getting a cookie, we cannot be unbound. 2015 */ 2016 stcb = sctp_aloc_assoc(inp, init_src, &error, 2017 ntohl(initack_cp->init.initiate_tag), vrf_id, 2018 ntohs(initack_cp->init.num_outbound_streams), 2019 port, 2020 (struct thread *)NULL, 2021 SCTP_DONT_INITIALIZE_AUTH_PARAMS); 2022 if (stcb == NULL) { 2023 struct mbuf *op_err; 2024 2025 /* memory problem? */ 2026 SCTPDBG(SCTP_DEBUG_INPUT1, 2027 "process_cookie_new: no room for another TCB!\n"); 2028 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2029 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2030 src, dst, sh, op_err, 2031 mflowtype, mflowid, 2032 vrf_id, port); 2033 return (NULL); 2034 } 2035 /* get the correct sctp_nets */ 2036 if (netp) 2037 *netp = sctp_findnet(stcb, init_src); 2038 2039 asoc = &stcb->asoc; 2040 /* get scope variables out of cookie */ 2041 asoc->scope.ipv4_local_scope = cookie->ipv4_scope; 2042 asoc->scope.site_scope = cookie->site_scope; 2043 asoc->scope.local_scope = cookie->local_scope; 2044 asoc->scope.loopback_scope = cookie->loopback_scope; 2045 2046 if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) || 2047 (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) { 2048 struct mbuf *op_err; 2049 2050 /* 2051 * Houston we have a problem. The EP changed while the 2052 * cookie was in flight. Only recourse is to abort the 2053 * association. 2054 */ 2055 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2056 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2057 src, dst, sh, op_err, 2058 mflowtype, mflowid, 2059 vrf_id, port); 2060 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2061 SCTP_FROM_SCTP_INPUT + SCTP_LOC_18); 2062 return (NULL); 2063 } 2064 /* process the INIT-ACK info (my info) */ 2065 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 2066 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 2067 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 2068 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 2069 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 2070 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 2071 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 2072 asoc->str_reset_seq_in = asoc->init_seq_number; 2073 2074 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 2075 2076 /* process the INIT info (peer's info) */ 2077 if (netp) 2078 retval = sctp_process_init(init_cp, stcb); 2079 else 2080 retval = 0; 2081 if (retval < 0) { 2082 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2083 SCTP_FROM_SCTP_INPUT + SCTP_LOC_19); 2084 return (NULL); 2085 } 2086 /* load all addresses */ 2087 if (sctp_load_addresses_from_init(stcb, m, 2088 init_offset + sizeof(struct sctp_init_chunk), initack_offset, 2089 src, dst, init_src, port)) { 2090 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2091 SCTP_FROM_SCTP_INPUT + SCTP_LOC_20); 2092 return (NULL); 2093 } 2094 /* 2095 * verify any preceding AUTH chunk that was skipped 2096 */ 2097 /* pull the local authentication parameters from the cookie/init-ack */ 2098 sctp_auth_get_cookie_params(stcb, m, 2099 initack_offset + sizeof(struct sctp_init_ack_chunk), 2100 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk))); 2101 if (auth_skipped) { 2102 struct sctp_auth_chunk *auth; 2103 2104 if (auth_len <= SCTP_CHUNK_BUFFER_SIZE) { 2105 auth = (struct sctp_auth_chunk *)sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf); 2106 } else { 2107 auth = NULL; 2108 } 2109 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) { 2110 /* auth HMAC failed, dump the assoc and packet */ 2111 SCTPDBG(SCTP_DEBUG_AUTH1, 2112 "COOKIE-ECHO: AUTH failed\n"); 2113 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2114 SCTP_FROM_SCTP_INPUT + SCTP_LOC_21); 2115 return (NULL); 2116 } else { 2117 /* remaining chunks checked... good to go */ 2118 stcb->asoc.authenticated = 1; 2119 } 2120 } 2121 2122 /* 2123 * if we're doing ASCONFs, check to see if we have any new local 2124 * addresses that need to get added to the peer (eg. addresses 2125 * changed while cookie echo in flight). This needs to be done 2126 * after we go to the OPEN state to do the correct asconf 2127 * processing. else, make sure we have the correct addresses in our 2128 * lists 2129 */ 2130 2131 /* warning, we re-use sin, sin6, sa_store here! */ 2132 /* pull in local_address (our "from" address) */ 2133 switch (cookie->laddr_type) { 2134 #ifdef INET 2135 case SCTP_IPV4_ADDRESS: 2136 /* source addr is IPv4 */ 2137 memset(&store.sin, 0, sizeof(struct sockaddr_in)); 2138 store.sin.sin_family = AF_INET; 2139 store.sin.sin_len = sizeof(struct sockaddr_in); 2140 store.sin.sin_addr.s_addr = cookie->laddress[0]; 2141 break; 2142 #endif 2143 #ifdef INET6 2144 case SCTP_IPV6_ADDRESS: 2145 /* source addr is IPv6 */ 2146 memset(&store.sin6, 0, sizeof(struct sockaddr_in6)); 2147 store.sin6.sin6_family = AF_INET6; 2148 store.sin6.sin6_len = sizeof(struct sockaddr_in6); 2149 store.sin6.sin6_scope_id = cookie->scope_id; 2150 memcpy(&store.sin6.sin6_addr, cookie->laddress, sizeof(struct in6_addr)); 2151 break; 2152 #endif 2153 default: 2154 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2155 SCTP_FROM_SCTP_INPUT + SCTP_LOC_22); 2156 return (NULL); 2157 } 2158 2159 /* update current state */ 2160 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2161 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 2162 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2163 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2164 stcb->sctp_ep, stcb, NULL); 2165 } 2166 sctp_stop_all_cookie_timers(stcb); 2167 SCTP_STAT_INCR_COUNTER32(sctps_passiveestab); 2168 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2169 2170 /* set up to notify upper layer */ 2171 *notification = SCTP_NOTIFY_ASSOC_UP; 2172 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2173 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 2174 (!SCTP_IS_LISTENING(inp))) { 2175 /* 2176 * This is an endpoint that called connect() how it got a 2177 * cookie that is NEW is a bit of a mystery. It must be that 2178 * the INIT was sent, but before it got there.. a complete 2179 * INIT/INIT-ACK/COOKIE arrived. But of course then it 2180 * should have went to the other code.. not here.. oh well.. 2181 * a bit of protection is worth having.. 2182 */ 2183 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2184 soisconnected(stcb->sctp_socket); 2185 } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 2186 (SCTP_IS_LISTENING(inp))) { 2187 /* 2188 * We don't want to do anything with this one. Since it is 2189 * the listening guy. The timer will get started for 2190 * accepted connections in the caller. 2191 */ 2192 ; 2193 } 2194 /* since we did not send a HB make sure we don't double things */ 2195 if ((netp) && (*netp)) 2196 (*netp)->hb_responded = 1; 2197 2198 if (stcb->asoc.sctp_autoclose_ticks && 2199 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2200 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL); 2201 } 2202 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 2203 if ((netp != NULL) && (*netp != NULL)) { 2204 struct timeval old; 2205 2206 /* calculate the RTT and set the encaps port */ 2207 old.tv_sec = cookie->time_entered.tv_sec; 2208 old.tv_usec = cookie->time_entered.tv_usec; 2209 sctp_calculate_rto(stcb, asoc, *netp, &old, SCTP_RTT_FROM_NON_DATA); 2210 } 2211 /* respond with a COOKIE-ACK */ 2212 sctp_send_cookie_ack(stcb); 2213 2214 /* 2215 * check the address lists for any ASCONFs that need to be sent 2216 * AFTER the cookie-ack is sent 2217 */ 2218 sctp_check_address_list(stcb, m, 2219 initack_offset + sizeof(struct sctp_init_ack_chunk), 2220 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)), 2221 &store.sa, cookie->local_scope, cookie->site_scope, 2222 cookie->ipv4_scope, cookie->loopback_scope); 2223 2224 return (stcb); 2225 } 2226 2227 /* 2228 * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e 2229 * we NEED to make sure we are not already using the vtag. If so we 2230 * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit! 2231 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag, 2232 SCTP_BASE_INFO(hashasocmark))]; 2233 LIST_FOREACH(stcb, head, sctp_asocs) { 2234 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep)) { 2235 -- SEND ABORT - TRY AGAIN -- 2236 } 2237 } 2238 */ 2239 2240 /* 2241 * handles a COOKIE-ECHO message stcb: modified to either a new or left as 2242 * existing (non-NULL) TCB 2243 */ 2244 static struct mbuf * 2245 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset, 2246 struct sockaddr *src, struct sockaddr *dst, 2247 struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp, 2248 struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp, 2249 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2250 struct sctp_tcb **locked_tcb, 2251 uint8_t mflowtype, uint32_t mflowid, 2252 uint32_t vrf_id, uint16_t port) 2253 { 2254 struct sctp_state_cookie *cookie; 2255 struct sctp_tcb *l_stcb = *stcb; 2256 struct sctp_inpcb *l_inp; 2257 struct sockaddr *to; 2258 struct sctp_pcb *ep; 2259 struct mbuf *m_sig; 2260 uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE]; 2261 uint8_t *sig; 2262 uint8_t cookie_ok = 0; 2263 unsigned int sig_offset, cookie_offset; 2264 unsigned int cookie_len; 2265 struct timeval now; 2266 struct timeval time_expires; 2267 int notification = 0; 2268 struct sctp_nets *netl; 2269 int had_a_existing_tcb = 0; 2270 int send_int_conf = 0; 2271 #ifdef INET 2272 struct sockaddr_in sin; 2273 #endif 2274 #ifdef INET6 2275 struct sockaddr_in6 sin6; 2276 #endif 2277 2278 SCTPDBG(SCTP_DEBUG_INPUT2, 2279 "sctp_handle_cookie: handling COOKIE-ECHO\n"); 2280 2281 if (inp_p == NULL) { 2282 return (NULL); 2283 } 2284 cookie = &cp->cookie; 2285 cookie_offset = offset + sizeof(struct sctp_chunkhdr); 2286 cookie_len = ntohs(cp->ch.chunk_length); 2287 2288 if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) + 2289 sizeof(struct sctp_init_chunk) + 2290 sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) { 2291 /* cookie too small */ 2292 return (NULL); 2293 } 2294 if ((cookie->peerport != sh->src_port) || 2295 (cookie->myport != sh->dest_port) || 2296 (cookie->my_vtag != sh->v_tag)) { 2297 /* 2298 * invalid ports or bad tag. Note that we always leave the 2299 * v_tag in the header in network order and when we stored 2300 * it in the my_vtag slot we also left it in network order. 2301 * This maintains the match even though it may be in the 2302 * opposite byte order of the machine :-> 2303 */ 2304 return (NULL); 2305 } 2306 /* 2307 * split off the signature into its own mbuf (since it should not be 2308 * calculated in the sctp_hmac_m() call). 2309 */ 2310 sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE; 2311 m_sig = m_split(m, sig_offset, M_NOWAIT); 2312 if (m_sig == NULL) { 2313 /* out of memory or ?? */ 2314 return (NULL); 2315 } 2316 #ifdef SCTP_MBUF_LOGGING 2317 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 2318 sctp_log_mbc(m_sig, SCTP_MBUF_SPLIT); 2319 } 2320 #endif 2321 2322 /* 2323 * compute the signature/digest for the cookie 2324 */ 2325 ep = &(*inp_p)->sctp_ep; 2326 l_inp = *inp_p; 2327 if (l_stcb) { 2328 SCTP_TCB_UNLOCK(l_stcb); 2329 } 2330 SCTP_INP_RLOCK(l_inp); 2331 if (l_stcb) { 2332 SCTP_TCB_LOCK(l_stcb); 2333 } 2334 /* which cookie is it? */ 2335 if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) && 2336 (ep->current_secret_number != ep->last_secret_number)) { 2337 /* it's the old cookie */ 2338 (void)sctp_hmac_m(SCTP_HMAC, 2339 (uint8_t *)ep->secret_key[(int)ep->last_secret_number], 2340 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2341 } else { 2342 /* it's the current cookie */ 2343 (void)sctp_hmac_m(SCTP_HMAC, 2344 (uint8_t *)ep->secret_key[(int)ep->current_secret_number], 2345 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2346 } 2347 /* get the signature */ 2348 SCTP_INP_RUNLOCK(l_inp); 2349 sig = (uint8_t *)sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *)&tmp_sig); 2350 if (sig == NULL) { 2351 /* couldn't find signature */ 2352 sctp_m_freem(m_sig); 2353 return (NULL); 2354 } 2355 /* compare the received digest with the computed digest */ 2356 if (timingsafe_bcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) { 2357 /* try the old cookie? */ 2358 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) && 2359 (ep->current_secret_number != ep->last_secret_number)) { 2360 /* compute digest with old */ 2361 (void)sctp_hmac_m(SCTP_HMAC, 2362 (uint8_t *)ep->secret_key[(int)ep->last_secret_number], 2363 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2364 /* compare */ 2365 if (timingsafe_bcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0) 2366 cookie_ok = 1; 2367 } 2368 } else { 2369 cookie_ok = 1; 2370 } 2371 2372 /* 2373 * Now before we continue we must reconstruct our mbuf so that 2374 * normal processing of any other chunks will work. 2375 */ 2376 { 2377 struct mbuf *m_at; 2378 2379 m_at = m; 2380 while (SCTP_BUF_NEXT(m_at) != NULL) { 2381 m_at = SCTP_BUF_NEXT(m_at); 2382 } 2383 SCTP_BUF_NEXT(m_at) = m_sig; 2384 } 2385 2386 if (cookie_ok == 0) { 2387 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n"); 2388 SCTPDBG(SCTP_DEBUG_INPUT2, 2389 "offset = %u, cookie_offset = %u, sig_offset = %u\n", 2390 (uint32_t)offset, cookie_offset, sig_offset); 2391 return (NULL); 2392 } 2393 2394 /* 2395 * check the cookie timestamps to be sure it's not stale 2396 */ 2397 (void)SCTP_GETTIME_TIMEVAL(&now); 2398 /* Expire time is in Ticks, so we convert to seconds */ 2399 time_expires.tv_sec = cookie->time_entered.tv_sec + sctp_ticks_to_secs(cookie->cookie_life); 2400 time_expires.tv_usec = cookie->time_entered.tv_usec; 2401 if (timevalcmp(&now, &time_expires, >)) { 2402 /* cookie is stale! */ 2403 struct mbuf *op_err; 2404 struct sctp_error_stale_cookie *cause; 2405 struct timeval diff; 2406 uint32_t staleness; 2407 2408 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_error_stale_cookie), 2409 0, M_NOWAIT, 1, MT_DATA); 2410 if (op_err == NULL) { 2411 /* FOOBAR */ 2412 return (NULL); 2413 } 2414 /* Set the len */ 2415 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_error_stale_cookie); 2416 cause = mtod(op_err, struct sctp_error_stale_cookie *); 2417 cause->cause.code = htons(SCTP_CAUSE_STALE_COOKIE); 2418 cause->cause.length = htons((sizeof(struct sctp_paramhdr) + 2419 (sizeof(uint32_t)))); 2420 diff = now; 2421 timevalsub(&diff, &time_expires); 2422 if ((uint32_t)diff.tv_sec > UINT32_MAX / 1000000) { 2423 staleness = UINT32_MAX; 2424 } else { 2425 staleness = diff.tv_sec * 1000000; 2426 } 2427 if (UINT32_MAX - staleness >= (uint32_t)diff.tv_usec) { 2428 staleness += diff.tv_usec; 2429 } else { 2430 staleness = UINT32_MAX; 2431 } 2432 cause->stale_time = htonl(staleness); 2433 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 2434 mflowtype, mflowid, l_inp->fibnum, 2435 vrf_id, port); 2436 return (NULL); 2437 } 2438 /* 2439 * Now we must see with the lookup address if we have an existing 2440 * asoc. This will only happen if we were in the COOKIE-WAIT state 2441 * and a INIT collided with us and somewhere the peer sent the 2442 * cookie on another address besides the single address our assoc 2443 * had for him. In this case we will have one of the tie-tags set at 2444 * least AND the address field in the cookie can be used to look it 2445 * up. 2446 */ 2447 to = NULL; 2448 switch (cookie->addr_type) { 2449 #ifdef INET6 2450 case SCTP_IPV6_ADDRESS: 2451 memset(&sin6, 0, sizeof(sin6)); 2452 sin6.sin6_family = AF_INET6; 2453 sin6.sin6_len = sizeof(sin6); 2454 sin6.sin6_port = sh->src_port; 2455 sin6.sin6_scope_id = cookie->scope_id; 2456 memcpy(&sin6.sin6_addr.s6_addr, cookie->address, 2457 sizeof(sin6.sin6_addr.s6_addr)); 2458 to = (struct sockaddr *)&sin6; 2459 break; 2460 #endif 2461 #ifdef INET 2462 case SCTP_IPV4_ADDRESS: 2463 memset(&sin, 0, sizeof(sin)); 2464 sin.sin_family = AF_INET; 2465 sin.sin_len = sizeof(sin); 2466 sin.sin_port = sh->src_port; 2467 sin.sin_addr.s_addr = cookie->address[0]; 2468 to = (struct sockaddr *)&sin; 2469 break; 2470 #endif 2471 default: 2472 /* This should not happen */ 2473 return (NULL); 2474 } 2475 if (*stcb == NULL) { 2476 /* Yep, lets check */ 2477 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL); 2478 if (*stcb == NULL) { 2479 /* 2480 * We should have only got back the same inp. If we 2481 * got back a different ep we have a problem. The 2482 * original findep got back l_inp and now 2483 */ 2484 if (l_inp != *inp_p) { 2485 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n"); 2486 } 2487 } else { 2488 if (*locked_tcb == NULL) { 2489 /* 2490 * In this case we found the assoc only 2491 * after we locked the create lock. This 2492 * means we are in a colliding case and we 2493 * must make sure that we unlock the tcb if 2494 * its one of the cases where we throw away 2495 * the incoming packets. 2496 */ 2497 *locked_tcb = *stcb; 2498 2499 /* 2500 * We must also increment the inp ref count 2501 * since the ref_count flags was set when we 2502 * did not find the TCB, now we found it 2503 * which reduces the refcount.. we must 2504 * raise it back out to balance it all :-) 2505 */ 2506 SCTP_INP_INCR_REF((*stcb)->sctp_ep); 2507 if ((*stcb)->sctp_ep != l_inp) { 2508 SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n", 2509 (void *)(*stcb)->sctp_ep, (void *)l_inp); 2510 } 2511 } 2512 } 2513 } 2514 2515 cookie_len -= SCTP_SIGNATURE_SIZE; 2516 if (*stcb == NULL) { 2517 /* this is the "normal" case... get a new TCB */ 2518 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh, 2519 cookie, cookie_len, *inp_p, 2520 netp, to, ¬ification, 2521 auth_skipped, auth_offset, auth_len, 2522 mflowtype, mflowid, 2523 vrf_id, port); 2524 } else { 2525 /* this is abnormal... cookie-echo on existing TCB */ 2526 had_a_existing_tcb = 1; 2527 *stcb = sctp_process_cookie_existing(m, iphlen, offset, 2528 src, dst, sh, 2529 cookie, cookie_len, *inp_p, *stcb, netp, to, 2530 ¬ification, auth_skipped, auth_offset, auth_len, 2531 mflowtype, mflowid, 2532 vrf_id, port); 2533 } 2534 2535 if (*stcb == NULL) { 2536 /* still no TCB... must be bad cookie-echo */ 2537 return (NULL); 2538 } 2539 if (*netp != NULL) { 2540 (*netp)->flowtype = mflowtype; 2541 (*netp)->flowid = mflowid; 2542 } 2543 /* 2544 * Ok, we built an association so confirm the address we sent the 2545 * INIT-ACK to. 2546 */ 2547 netl = sctp_findnet(*stcb, to); 2548 /* 2549 * This code should in theory NOT run but 2550 */ 2551 if (netl == NULL) { 2552 /* TSNH! Huh, why do I need to add this address here? */ 2553 if (sctp_add_remote_addr(*stcb, to, NULL, port, 2554 SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) { 2555 return (NULL); 2556 } 2557 netl = sctp_findnet(*stcb, to); 2558 } 2559 if (netl) { 2560 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) { 2561 netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 2562 (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL, 2563 netl); 2564 send_int_conf = 1; 2565 } 2566 } 2567 sctp_start_net_timers(*stcb); 2568 if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) { 2569 if (!had_a_existing_tcb || 2570 (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) { 2571 /* 2572 * If we have a NEW cookie or the connect never 2573 * reached the connected state during collision we 2574 * must do the TCP accept thing. 2575 */ 2576 struct socket *so, *oso; 2577 struct sctp_inpcb *inp; 2578 2579 if (notification == SCTP_NOTIFY_ASSOC_RESTART) { 2580 /* 2581 * For a restart we will keep the same 2582 * socket, no need to do anything. I THINK!! 2583 */ 2584 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2585 if (send_int_conf) { 2586 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2587 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2588 } 2589 return (m); 2590 } 2591 oso = (*inp_p)->sctp_socket; 2592 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2593 SCTP_TCB_UNLOCK((*stcb)); 2594 CURVNET_SET(oso->so_vnet); 2595 so = sonewconn(oso, 0 2596 ); 2597 CURVNET_RESTORE(); 2598 SCTP_TCB_LOCK((*stcb)); 2599 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2600 2601 if (so == NULL) { 2602 struct mbuf *op_err; 2603 2604 /* Too many sockets */ 2605 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n"); 2606 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2607 sctp_abort_association(*inp_p, NULL, m, iphlen, 2608 src, dst, sh, op_err, 2609 mflowtype, mflowid, 2610 vrf_id, port); 2611 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, 2612 SCTP_FROM_SCTP_INPUT + SCTP_LOC_23); 2613 return (NULL); 2614 } 2615 inp = (struct sctp_inpcb *)so->so_pcb; 2616 SCTP_INP_INCR_REF(inp); 2617 /* 2618 * We add the unbound flag here so that if we get an 2619 * soabort() before we get the move_pcb done, we 2620 * will properly cleanup. 2621 */ 2622 inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE | 2623 SCTP_PCB_FLAGS_CONNECTED | 2624 SCTP_PCB_FLAGS_IN_TCPPOOL | 2625 SCTP_PCB_FLAGS_UNBOUND | 2626 (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) | 2627 SCTP_PCB_FLAGS_DONT_WAKE); 2628 inp->sctp_features = (*inp_p)->sctp_features; 2629 inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features; 2630 inp->sctp_socket = so; 2631 inp->sctp_frag_point = (*inp_p)->sctp_frag_point; 2632 inp->max_cwnd = (*inp_p)->max_cwnd; 2633 inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off; 2634 inp->ecn_supported = (*inp_p)->ecn_supported; 2635 inp->prsctp_supported = (*inp_p)->prsctp_supported; 2636 inp->auth_supported = (*inp_p)->auth_supported; 2637 inp->asconf_supported = (*inp_p)->asconf_supported; 2638 inp->reconfig_supported = (*inp_p)->reconfig_supported; 2639 inp->nrsack_supported = (*inp_p)->nrsack_supported; 2640 inp->pktdrop_supported = (*inp_p)->pktdrop_supported; 2641 inp->partial_delivery_point = (*inp_p)->partial_delivery_point; 2642 inp->sctp_context = (*inp_p)->sctp_context; 2643 inp->local_strreset_support = (*inp_p)->local_strreset_support; 2644 inp->fibnum = (*inp_p)->fibnum; 2645 inp->inp_starting_point_for_iterator = NULL; 2646 /* 2647 * copy in the authentication parameters from the 2648 * original endpoint 2649 */ 2650 if (inp->sctp_ep.local_hmacs) 2651 sctp_free_hmaclist(inp->sctp_ep.local_hmacs); 2652 inp->sctp_ep.local_hmacs = 2653 sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs); 2654 if (inp->sctp_ep.local_auth_chunks) 2655 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks); 2656 inp->sctp_ep.local_auth_chunks = 2657 sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks); 2658 2659 /* 2660 * Now we must move it from one hash table to 2661 * another and get the tcb in the right place. 2662 */ 2663 2664 /* 2665 * This is where the one-2-one socket is put into 2666 * the accept state waiting for the accept! 2667 */ 2668 if (*stcb) { 2669 SCTP_ADD_SUBSTATE(*stcb, SCTP_STATE_IN_ACCEPT_QUEUE); 2670 } 2671 sctp_move_pcb_and_assoc(*inp_p, inp, *stcb); 2672 2673 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2674 SCTP_TCB_UNLOCK((*stcb)); 2675 2676 sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb, 2677 0); 2678 SCTP_TCB_LOCK((*stcb)); 2679 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2680 2681 /* 2682 * now we must check to see if we were aborted while 2683 * the move was going on and the lock/unlock 2684 * happened. 2685 */ 2686 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 2687 /* 2688 * yep it was, we leave the assoc attached 2689 * to the socket since the sctp_inpcb_free() 2690 * call will send an abort for us. 2691 */ 2692 SCTP_INP_DECR_REF(inp); 2693 return (NULL); 2694 } 2695 SCTP_INP_DECR_REF(inp); 2696 /* Switch over to the new guy */ 2697 *inp_p = inp; 2698 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2699 if (send_int_conf) { 2700 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2701 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2702 } 2703 2704 /* 2705 * Pull it from the incomplete queue and wake the 2706 * guy 2707 */ 2708 soisconnected(so); 2709 return (m); 2710 } 2711 } 2712 if (notification) { 2713 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2714 } 2715 if (send_int_conf) { 2716 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2717 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2718 } 2719 return (m); 2720 } 2721 2722 static void 2723 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED, 2724 struct sctp_tcb *stcb, struct sctp_nets *net) 2725 { 2726 /* cp must not be used, others call this without a c-ack :-) */ 2727 struct sctp_association *asoc; 2728 struct sctp_tmit_chunk *chk; 2729 2730 SCTPDBG(SCTP_DEBUG_INPUT2, 2731 "sctp_handle_cookie_ack: handling COOKIE-ACK\n"); 2732 if ((stcb == NULL) || (net == NULL)) { 2733 return; 2734 } 2735 2736 asoc = &stcb->asoc; 2737 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 2738 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 2739 asoc->overall_error_count, 2740 0, 2741 SCTP_FROM_SCTP_INPUT, 2742 __LINE__); 2743 } 2744 asoc->overall_error_count = 0; 2745 sctp_stop_all_cookie_timers(stcb); 2746 /* process according to association state */ 2747 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) { 2748 /* state change only needed when I am in right state */ 2749 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2750 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 2751 sctp_start_net_timers(stcb); 2752 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2753 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2754 stcb->sctp_ep, stcb, NULL); 2755 } 2756 /* update RTO */ 2757 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 2758 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2759 if (asoc->overall_error_count == 0) { 2760 sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, 2761 SCTP_RTT_FROM_NON_DATA); 2762 } 2763 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 2764 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2765 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2766 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 2767 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2768 if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) { 2769 soisconnected(stcb->sctp_socket); 2770 } 2771 } 2772 /* 2773 * since we did not send a HB make sure we don't double 2774 * things 2775 */ 2776 net->hb_responded = 1; 2777 2778 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2779 /* 2780 * We don't need to do the asconf thing, nor hb or 2781 * autoclose if the socket is closed. 2782 */ 2783 goto closed_socket; 2784 } 2785 2786 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 2787 stcb, net); 2788 2789 if (stcb->asoc.sctp_autoclose_ticks && 2790 sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2791 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 2792 stcb->sctp_ep, stcb, NULL); 2793 } 2794 /* 2795 * send ASCONF if parameters are pending and ASCONFs are 2796 * allowed (eg. addresses changed when init/cookie echo were 2797 * in flight) 2798 */ 2799 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) && 2800 (stcb->asoc.asconf_supported == 1) && 2801 (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) { 2802 #ifdef SCTP_TIMER_BASED_ASCONF 2803 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, 2804 stcb->sctp_ep, stcb, 2805 stcb->asoc.primary_destination); 2806 #else 2807 sctp_send_asconf(stcb, stcb->asoc.primary_destination, 2808 SCTP_ADDR_NOT_LOCKED); 2809 #endif 2810 } 2811 } 2812 closed_socket: 2813 /* Toss the cookie if I can */ 2814 sctp_toss_old_cookies(stcb, asoc); 2815 /* Restart the timer if we have pending data */ 2816 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) { 2817 if (chk->whoTo != NULL) { 2818 break; 2819 } 2820 } 2821 if (chk != NULL) { 2822 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 2823 } 2824 } 2825 2826 static void 2827 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp, 2828 struct sctp_tcb *stcb) 2829 { 2830 struct sctp_nets *net; 2831 struct sctp_tmit_chunk *lchk; 2832 struct sctp_ecne_chunk bkup; 2833 uint8_t override_bit; 2834 uint32_t tsn, window_data_tsn; 2835 int len; 2836 unsigned int pkt_cnt; 2837 2838 len = ntohs(cp->ch.chunk_length); 2839 if ((len != sizeof(struct sctp_ecne_chunk)) && 2840 (len != sizeof(struct old_sctp_ecne_chunk))) { 2841 return; 2842 } 2843 if (len == sizeof(struct old_sctp_ecne_chunk)) { 2844 /* Its the old format */ 2845 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk)); 2846 bkup.num_pkts_since_cwr = htonl(1); 2847 cp = &bkup; 2848 } 2849 SCTP_STAT_INCR(sctps_recvecne); 2850 tsn = ntohl(cp->tsn); 2851 pkt_cnt = ntohl(cp->num_pkts_since_cwr); 2852 lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead); 2853 if (lchk == NULL) { 2854 window_data_tsn = stcb->asoc.sending_seq - 1; 2855 } else { 2856 window_data_tsn = lchk->rec.data.tsn; 2857 } 2858 2859 /* Find where it was sent to if possible. */ 2860 net = NULL; 2861 TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) { 2862 if (lchk->rec.data.tsn == tsn) { 2863 net = lchk->whoTo; 2864 net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send; 2865 break; 2866 } 2867 if (SCTP_TSN_GT(lchk->rec.data.tsn, tsn)) { 2868 break; 2869 } 2870 } 2871 if (net == NULL) { 2872 /* 2873 * What to do. A previous send of a CWR was possibly lost. 2874 * See how old it is, we may have it marked on the actual 2875 * net. 2876 */ 2877 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 2878 if (tsn == net->last_cwr_tsn) { 2879 /* Found him, send it off */ 2880 break; 2881 } 2882 } 2883 if (net == NULL) { 2884 /* 2885 * If we reach here, we need to send a special CWR 2886 * that says hey, we did this a long time ago and 2887 * you lost the response. 2888 */ 2889 net = TAILQ_FIRST(&stcb->asoc.nets); 2890 if (net == NULL) { 2891 /* TSNH */ 2892 return; 2893 } 2894 override_bit = SCTP_CWR_REDUCE_OVERRIDE; 2895 } else { 2896 override_bit = 0; 2897 } 2898 } else { 2899 override_bit = 0; 2900 } 2901 if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) && 2902 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 2903 /* 2904 * JRS - Use the congestion control given in the pluggable 2905 * CC module 2906 */ 2907 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt); 2908 /* 2909 * We reduce once every RTT. So we will only lower cwnd at 2910 * the next sending seq i.e. the window_data_tsn 2911 */ 2912 net->cwr_window_tsn = window_data_tsn; 2913 net->ecn_ce_pkt_cnt += pkt_cnt; 2914 net->lost_cnt = pkt_cnt; 2915 net->last_cwr_tsn = tsn; 2916 } else { 2917 override_bit |= SCTP_CWR_IN_SAME_WINDOW; 2918 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) && 2919 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 2920 /* 2921 * Another loss in the same window update how many 2922 * marks/packets lost we have had. 2923 */ 2924 int cnt = 1; 2925 2926 if (pkt_cnt > net->lost_cnt) { 2927 /* Should be the case */ 2928 cnt = (pkt_cnt - net->lost_cnt); 2929 net->ecn_ce_pkt_cnt += cnt; 2930 } 2931 net->lost_cnt = pkt_cnt; 2932 net->last_cwr_tsn = tsn; 2933 /* 2934 * Most CC functions will ignore this call, since we 2935 * are in-window yet of the initial CE the peer saw. 2936 */ 2937 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt); 2938 } 2939 } 2940 /* 2941 * We always send a CWR this way if our previous one was lost our 2942 * peer will get an update, or if it is not time again to reduce we 2943 * still get the cwr to the peer. Note we set the override when we 2944 * could not find the TSN on the chunk or the destination network. 2945 */ 2946 sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit); 2947 } 2948 2949 static void 2950 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net) 2951 { 2952 /* 2953 * Here we get a CWR from the peer. We must look in the outqueue and 2954 * make sure that we have a covered ECNE in the control chunk part. 2955 * If so remove it. 2956 */ 2957 struct sctp_tmit_chunk *chk, *nchk; 2958 struct sctp_ecne_chunk *ecne; 2959 int override; 2960 uint32_t cwr_tsn; 2961 2962 cwr_tsn = ntohl(cp->tsn); 2963 override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE; 2964 TAILQ_FOREACH_SAFE(chk, &stcb->asoc.control_send_queue, sctp_next, nchk) { 2965 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) { 2966 continue; 2967 } 2968 if ((override == 0) && (chk->whoTo != net)) { 2969 /* Must be from the right src unless override is set */ 2970 continue; 2971 } 2972 ecne = mtod(chk->data, struct sctp_ecne_chunk *); 2973 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) { 2974 /* this covers this ECNE, we can remove it */ 2975 stcb->asoc.ecn_echo_cnt_onq--; 2976 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, 2977 sctp_next); 2978 stcb->asoc.ctrl_queue_cnt--; 2979 sctp_m_freem(chk->data); 2980 chk->data = NULL; 2981 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 2982 if (override == 0) { 2983 break; 2984 } 2985 } 2986 } 2987 } 2988 2989 static void 2990 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED, 2991 struct sctp_tcb *stcb, struct sctp_nets *net) 2992 { 2993 2994 SCTPDBG(SCTP_DEBUG_INPUT2, 2995 "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n"); 2996 if (stcb == NULL) 2997 return; 2998 2999 /* process according to association state */ 3000 if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 3001 /* unexpected SHUTDOWN-COMPLETE... so ignore... */ 3002 SCTPDBG(SCTP_DEBUG_INPUT2, 3003 "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n"); 3004 SCTP_TCB_UNLOCK(stcb); 3005 return; 3006 } 3007 /* notify upper layer protocol */ 3008 if (stcb->sctp_socket) { 3009 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 3010 } 3011 #ifdef INVARIANTS 3012 if (!TAILQ_EMPTY(&stcb->asoc.send_queue) || 3013 !TAILQ_EMPTY(&stcb->asoc.sent_queue) || 3014 sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) { 3015 panic("Queues are not empty when handling SHUTDOWN-COMPLETE"); 3016 } 3017 #endif 3018 /* stop the timer */ 3019 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, 3020 SCTP_FROM_SCTP_INPUT + SCTP_LOC_24); 3021 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 3022 /* free the TCB */ 3023 SCTPDBG(SCTP_DEBUG_INPUT2, 3024 "sctp_handle_shutdown_complete: calls free-asoc\n"); 3025 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 3026 SCTP_FROM_SCTP_INPUT + SCTP_LOC_25); 3027 return; 3028 } 3029 3030 static int 3031 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc, 3032 struct sctp_nets *net, uint8_t flg) 3033 { 3034 switch (desc->chunk_type) { 3035 case SCTP_DATA: 3036 case SCTP_IDATA: 3037 /* find the tsn to resend (possibly) */ 3038 { 3039 uint32_t tsn; 3040 struct sctp_tmit_chunk *tp1; 3041 3042 tsn = ntohl(desc->tsn_ifany); 3043 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3044 if (tp1->rec.data.tsn == tsn) { 3045 /* found it */ 3046 break; 3047 } 3048 if (SCTP_TSN_GT(tp1->rec.data.tsn, tsn)) { 3049 /* not found */ 3050 tp1 = NULL; 3051 break; 3052 } 3053 } 3054 if (tp1 == NULL) { 3055 /* 3056 * Do it the other way , aka without paying 3057 * attention to queue seq order. 3058 */ 3059 SCTP_STAT_INCR(sctps_pdrpdnfnd); 3060 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3061 if (tp1->rec.data.tsn == tsn) { 3062 /* found it */ 3063 break; 3064 } 3065 } 3066 } 3067 if (tp1 == NULL) { 3068 SCTP_STAT_INCR(sctps_pdrptsnnf); 3069 } 3070 if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) { 3071 if (((flg & SCTP_BADCRC) == 0) && 3072 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3073 return (0); 3074 } 3075 if ((stcb->asoc.peers_rwnd == 0) && 3076 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3077 SCTP_STAT_INCR(sctps_pdrpdiwnp); 3078 return (0); 3079 } 3080 if (stcb->asoc.peers_rwnd == 0 && 3081 (flg & SCTP_FROM_MIDDLE_BOX)) { 3082 SCTP_STAT_INCR(sctps_pdrpdizrw); 3083 return (0); 3084 } 3085 if ((uint32_t)SCTP_BUF_LEN(tp1->data) < 3086 SCTP_DATA_CHUNK_OVERHEAD(stcb) + SCTP_NUM_DB_TO_VERIFY) { 3087 /* Payload not matching. */ 3088 SCTP_STAT_INCR(sctps_pdrpbadd); 3089 return (-1); 3090 } 3091 if (memcmp(mtod(tp1->data, caddr_t)+SCTP_DATA_CHUNK_OVERHEAD(stcb), 3092 desc->data_bytes, SCTP_NUM_DB_TO_VERIFY) != 0) { 3093 /* Payload not matching. */ 3094 SCTP_STAT_INCR(sctps_pdrpbadd); 3095 return (-1); 3096 } 3097 if (tp1->do_rtt) { 3098 /* 3099 * this guy had a RTO calculation 3100 * pending on it, cancel it 3101 */ 3102 if (tp1->whoTo->rto_needed == 0) { 3103 tp1->whoTo->rto_needed = 1; 3104 } 3105 tp1->do_rtt = 0; 3106 } 3107 SCTP_STAT_INCR(sctps_pdrpmark); 3108 if (tp1->sent != SCTP_DATAGRAM_RESEND) 3109 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3110 /* 3111 * mark it as if we were doing a FR, since 3112 * we will be getting gap ack reports behind 3113 * the info from the router. 3114 */ 3115 tp1->rec.data.doing_fast_retransmit = 1; 3116 /* 3117 * mark the tsn with what sequences can 3118 * cause a new FR. 3119 */ 3120 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) { 3121 tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq; 3122 } else { 3123 tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.tsn; 3124 } 3125 3126 /* restart the timer */ 3127 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3128 stcb, tp1->whoTo, 3129 SCTP_FROM_SCTP_INPUT + SCTP_LOC_26); 3130 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3131 stcb, tp1->whoTo); 3132 3133 /* fix counts and things */ 3134 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 3135 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP, 3136 tp1->whoTo->flight_size, 3137 tp1->book_size, 3138 (uint32_t)(uintptr_t)stcb, 3139 tp1->rec.data.tsn); 3140 } 3141 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3142 sctp_flight_size_decrease(tp1); 3143 sctp_total_flight_decrease(stcb, tp1); 3144 } 3145 tp1->sent = SCTP_DATAGRAM_RESEND; 3146 } { 3147 /* audit code */ 3148 unsigned int audit; 3149 3150 audit = 0; 3151 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3152 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3153 audit++; 3154 } 3155 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue, 3156 sctp_next) { 3157 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3158 audit++; 3159 } 3160 if (audit != stcb->asoc.sent_queue_retran_cnt) { 3161 SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n", 3162 audit, stcb->asoc.sent_queue_retran_cnt); 3163 #ifndef SCTP_AUDITING_ENABLED 3164 stcb->asoc.sent_queue_retran_cnt = audit; 3165 #endif 3166 } 3167 } 3168 } 3169 break; 3170 case SCTP_ASCONF: 3171 { 3172 struct sctp_tmit_chunk *asconf; 3173 3174 TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue, 3175 sctp_next) { 3176 if (asconf->rec.chunk_id.id == SCTP_ASCONF) { 3177 break; 3178 } 3179 } 3180 if (asconf) { 3181 if (asconf->sent != SCTP_DATAGRAM_RESEND) 3182 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3183 asconf->sent = SCTP_DATAGRAM_RESEND; 3184 asconf->snd_count--; 3185 } 3186 } 3187 break; 3188 case SCTP_INITIATION: 3189 /* resend the INIT */ 3190 stcb->asoc.dropped_special_cnt++; 3191 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) { 3192 /* 3193 * If we can get it in, in a few attempts we do 3194 * this, otherwise we let the timer fire. 3195 */ 3196 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, 3197 stcb, net, 3198 SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 3199 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 3200 } 3201 break; 3202 case SCTP_SELECTIVE_ACK: 3203 case SCTP_NR_SELECTIVE_ACK: 3204 /* resend the sack */ 3205 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED); 3206 break; 3207 case SCTP_HEARTBEAT_REQUEST: 3208 /* resend a demand HB */ 3209 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) { 3210 /* 3211 * Only retransmit if we KNOW we wont destroy the 3212 * tcb 3213 */ 3214 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 3215 } 3216 break; 3217 case SCTP_SHUTDOWN: 3218 sctp_send_shutdown(stcb, net); 3219 break; 3220 case SCTP_SHUTDOWN_ACK: 3221 sctp_send_shutdown_ack(stcb, net); 3222 break; 3223 case SCTP_COOKIE_ECHO: 3224 { 3225 struct sctp_tmit_chunk *cookie; 3226 3227 cookie = NULL; 3228 TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, 3229 sctp_next) { 3230 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) { 3231 break; 3232 } 3233 } 3234 if (cookie) { 3235 if (cookie->sent != SCTP_DATAGRAM_RESEND) 3236 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3237 cookie->sent = SCTP_DATAGRAM_RESEND; 3238 sctp_stop_all_cookie_timers(stcb); 3239 } 3240 } 3241 break; 3242 case SCTP_COOKIE_ACK: 3243 sctp_send_cookie_ack(stcb); 3244 break; 3245 case SCTP_ASCONF_ACK: 3246 /* resend last asconf ack */ 3247 sctp_send_asconf_ack(stcb); 3248 break; 3249 case SCTP_IFORWARD_CUM_TSN: 3250 case SCTP_FORWARD_CUM_TSN: 3251 send_forward_tsn(stcb, &stcb->asoc); 3252 break; 3253 /* can't do anything with these */ 3254 case SCTP_PACKET_DROPPED: 3255 case SCTP_INITIATION_ACK: /* this should not happen */ 3256 case SCTP_HEARTBEAT_ACK: 3257 case SCTP_ABORT_ASSOCIATION: 3258 case SCTP_OPERATION_ERROR: 3259 case SCTP_SHUTDOWN_COMPLETE: 3260 case SCTP_ECN_ECHO: 3261 case SCTP_ECN_CWR: 3262 default: 3263 break; 3264 } 3265 return (0); 3266 } 3267 3268 void 3269 sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list) 3270 { 3271 uint32_t i; 3272 uint16_t temp; 3273 3274 /* 3275 * We set things to 0xffffffff since this is the last delivered 3276 * sequence and we will be sending in 0 after the reset. 3277 */ 3278 3279 if (number_entries) { 3280 for (i = 0; i < number_entries; i++) { 3281 temp = ntohs(list[i]); 3282 if (temp >= stcb->asoc.streamincnt) { 3283 continue; 3284 } 3285 stcb->asoc.strmin[temp].last_mid_delivered = 0xffffffff; 3286 } 3287 } else { 3288 list = NULL; 3289 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3290 stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff; 3291 } 3292 } 3293 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3294 } 3295 3296 static void 3297 sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list) 3298 { 3299 uint32_t i; 3300 uint16_t temp; 3301 3302 if (number_entries > 0) { 3303 for (i = 0; i < number_entries; i++) { 3304 temp = ntohs(list[i]); 3305 if (temp >= stcb->asoc.streamoutcnt) { 3306 /* no such stream */ 3307 continue; 3308 } 3309 stcb->asoc.strmout[temp].next_mid_ordered = 0; 3310 stcb->asoc.strmout[temp].next_mid_unordered = 0; 3311 } 3312 } else { 3313 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3314 stcb->asoc.strmout[i].next_mid_ordered = 0; 3315 stcb->asoc.strmout[i].next_mid_unordered = 0; 3316 } 3317 } 3318 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3319 } 3320 3321 static void 3322 sctp_reset_clear_pending(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list) 3323 { 3324 uint32_t i; 3325 uint16_t temp; 3326 3327 if (number_entries > 0) { 3328 for (i = 0; i < number_entries; i++) { 3329 temp = ntohs(list[i]); 3330 if (temp >= stcb->asoc.streamoutcnt) { 3331 /* no such stream */ 3332 continue; 3333 } 3334 stcb->asoc.strmout[temp].state = SCTP_STREAM_OPEN; 3335 } 3336 } else { 3337 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3338 stcb->asoc.strmout[i].state = SCTP_STREAM_OPEN; 3339 } 3340 } 3341 } 3342 3343 struct sctp_stream_reset_request * 3344 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk) 3345 { 3346 struct sctp_association *asoc; 3347 struct sctp_chunkhdr *ch; 3348 struct sctp_stream_reset_request *r; 3349 struct sctp_tmit_chunk *chk; 3350 int len, clen; 3351 3352 asoc = &stcb->asoc; 3353 if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 3354 asoc->stream_reset_outstanding = 0; 3355 return (NULL); 3356 } 3357 if (stcb->asoc.str_reset == NULL) { 3358 asoc->stream_reset_outstanding = 0; 3359 return (NULL); 3360 } 3361 chk = stcb->asoc.str_reset; 3362 if (chk->data == NULL) { 3363 return (NULL); 3364 } 3365 if (bchk) { 3366 /* he wants a copy of the chk pointer */ 3367 *bchk = chk; 3368 } 3369 clen = chk->send_size; 3370 ch = mtod(chk->data, struct sctp_chunkhdr *); 3371 r = (struct sctp_stream_reset_request *)(ch + 1); 3372 if (ntohl(r->request_seq) == seq) { 3373 /* found it */ 3374 return (r); 3375 } 3376 len = SCTP_SIZE32(ntohs(r->ph.param_length)); 3377 if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) { 3378 /* move to the next one, there can only be a max of two */ 3379 r = (struct sctp_stream_reset_request *)((caddr_t)r + len); 3380 if (ntohl(r->request_seq) == seq) { 3381 return (r); 3382 } 3383 } 3384 /* that seq is not here */ 3385 return (NULL); 3386 } 3387 3388 static void 3389 sctp_clean_up_stream_reset(struct sctp_tcb *stcb) 3390 { 3391 struct sctp_association *asoc; 3392 struct sctp_tmit_chunk *chk; 3393 3394 asoc = &stcb->asoc; 3395 chk = asoc->str_reset; 3396 if (chk == NULL) { 3397 return; 3398 } 3399 asoc->str_reset = NULL; 3400 sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, 3401 NULL, SCTP_FROM_SCTP_INPUT + SCTP_LOC_28); 3402 TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next); 3403 asoc->ctrl_queue_cnt--; 3404 if (chk->data) { 3405 sctp_m_freem(chk->data); 3406 chk->data = NULL; 3407 } 3408 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3409 } 3410 3411 static int 3412 sctp_handle_stream_reset_response(struct sctp_tcb *stcb, 3413 uint32_t seq, uint32_t action, 3414 struct sctp_stream_reset_response *respin) 3415 { 3416 uint16_t type; 3417 int lparam_len; 3418 struct sctp_association *asoc = &stcb->asoc; 3419 struct sctp_tmit_chunk *chk; 3420 struct sctp_stream_reset_request *req_param; 3421 struct sctp_stream_reset_out_request *req_out_param; 3422 struct sctp_stream_reset_in_request *req_in_param; 3423 uint32_t number_entries; 3424 3425 if (asoc->stream_reset_outstanding == 0) { 3426 /* duplicate */ 3427 return (0); 3428 } 3429 if (seq == stcb->asoc.str_reset_seq_out) { 3430 req_param = sctp_find_stream_reset(stcb, seq, &chk); 3431 if (req_param != NULL) { 3432 stcb->asoc.str_reset_seq_out++; 3433 type = ntohs(req_param->ph.param_type); 3434 lparam_len = ntohs(req_param->ph.param_length); 3435 if (type == SCTP_STR_RESET_OUT_REQUEST) { 3436 int no_clear = 0; 3437 3438 req_out_param = (struct sctp_stream_reset_out_request *)req_param; 3439 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t); 3440 asoc->stream_reset_out_is_outstanding = 0; 3441 if (asoc->stream_reset_outstanding) 3442 asoc->stream_reset_outstanding--; 3443 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3444 /* do it */ 3445 sctp_reset_out_streams(stcb, number_entries, req_out_param->list_of_streams); 3446 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3447 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3448 } else if (action == SCTP_STREAM_RESET_RESULT_IN_PROGRESS) { 3449 /* 3450 * Set it up so we don't stop 3451 * retransmitting 3452 */ 3453 asoc->stream_reset_outstanding++; 3454 stcb->asoc.str_reset_seq_out--; 3455 asoc->stream_reset_out_is_outstanding = 1; 3456 no_clear = 1; 3457 } else { 3458 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3459 } 3460 if (no_clear == 0) { 3461 sctp_reset_clear_pending(stcb, number_entries, req_out_param->list_of_streams); 3462 } 3463 } else if (type == SCTP_STR_RESET_IN_REQUEST) { 3464 req_in_param = (struct sctp_stream_reset_in_request *)req_param; 3465 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t); 3466 if (asoc->stream_reset_outstanding) 3467 asoc->stream_reset_outstanding--; 3468 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3469 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb, 3470 number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3471 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3472 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb, 3473 number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3474 } 3475 } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) { 3476 /* Ok we now may have more streams */ 3477 int num_stream; 3478 3479 num_stream = stcb->asoc.strm_pending_add_size; 3480 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) { 3481 /* TSNH */ 3482 num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt; 3483 } 3484 stcb->asoc.strm_pending_add_size = 0; 3485 if (asoc->stream_reset_outstanding) 3486 asoc->stream_reset_outstanding--; 3487 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3488 /* Put the new streams into effect */ 3489 int i; 3490 3491 for (i = asoc->streamoutcnt; i < (asoc->streamoutcnt + num_stream); i++) { 3492 asoc->strmout[i].state = SCTP_STREAM_OPEN; 3493 } 3494 asoc->streamoutcnt += num_stream; 3495 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 3496 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3497 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3498 SCTP_STREAM_CHANGE_DENIED); 3499 } else { 3500 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3501 SCTP_STREAM_CHANGE_FAILED); 3502 } 3503 } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) { 3504 if (asoc->stream_reset_outstanding) 3505 asoc->stream_reset_outstanding--; 3506 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3507 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3508 SCTP_STREAM_CHANGE_DENIED); 3509 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3510 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3511 SCTP_STREAM_CHANGE_FAILED); 3512 } 3513 } else if (type == SCTP_STR_RESET_TSN_REQUEST) { 3514 /** 3515 * a) Adopt the new in tsn. 3516 * b) reset the map 3517 * c) Adopt the new out-tsn 3518 */ 3519 struct sctp_stream_reset_response_tsn *resp; 3520 struct sctp_forward_tsn_chunk fwdtsn; 3521 int abort_flag = 0; 3522 3523 if (respin == NULL) { 3524 /* huh ? */ 3525 return (0); 3526 } 3527 if (ntohs(respin->ph.param_length) < sizeof(struct sctp_stream_reset_response_tsn)) { 3528 return (0); 3529 } 3530 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3531 resp = (struct sctp_stream_reset_response_tsn *)respin; 3532 asoc->stream_reset_outstanding--; 3533 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3534 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3535 fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1); 3536 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3537 if (abort_flag) { 3538 return (1); 3539 } 3540 stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1); 3541 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3542 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3543 } 3544 3545 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 3546 stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn); 3547 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 3548 3549 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map; 3550 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size); 3551 3552 stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn); 3553 stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn; 3554 3555 sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL); 3556 sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL); 3557 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0); 3558 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3559 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3560 SCTP_ASSOC_RESET_DENIED); 3561 } else { 3562 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3563 SCTP_ASSOC_RESET_FAILED); 3564 } 3565 } 3566 /* get rid of the request and get the request flags */ 3567 if (asoc->stream_reset_outstanding == 0) { 3568 sctp_clean_up_stream_reset(stcb); 3569 } 3570 } 3571 } 3572 if (asoc->stream_reset_outstanding == 0) { 3573 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED); 3574 } 3575 return (0); 3576 } 3577 3578 static void 3579 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb, 3580 struct sctp_tmit_chunk *chk, 3581 struct sctp_stream_reset_in_request *req, int trunc) 3582 { 3583 uint32_t seq; 3584 int len, i; 3585 int number_entries; 3586 uint16_t temp; 3587 3588 /* 3589 * peer wants me to send a str-reset to him for my outgoing seq's if 3590 * seq_in is right. 3591 */ 3592 struct sctp_association *asoc = &stcb->asoc; 3593 3594 seq = ntohl(req->request_seq); 3595 if (asoc->str_reset_seq_in == seq) { 3596 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3597 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3598 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3599 } else if (trunc) { 3600 /* Can't do it, since they exceeded our buffer size */ 3601 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3602 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) { 3603 len = ntohs(req->ph.param_length); 3604 number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t)); 3605 if (number_entries) { 3606 for (i = 0; i < number_entries; i++) { 3607 temp = ntohs(req->list_of_streams[i]); 3608 if (temp >= stcb->asoc.streamoutcnt) { 3609 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3610 goto bad_boy; 3611 } 3612 req->list_of_streams[i] = temp; 3613 } 3614 for (i = 0; i < number_entries; i++) { 3615 if (stcb->asoc.strmout[req->list_of_streams[i]].state == SCTP_STREAM_OPEN) { 3616 stcb->asoc.strmout[req->list_of_streams[i]].state = SCTP_STREAM_RESET_PENDING; 3617 } 3618 } 3619 } else { 3620 /* Its all */ 3621 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3622 if (stcb->asoc.strmout[i].state == SCTP_STREAM_OPEN) 3623 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_PENDING; 3624 } 3625 } 3626 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3627 } else { 3628 /* Can't do it, since we have sent one out */ 3629 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 3630 } 3631 bad_boy: 3632 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3633 asoc->str_reset_seq_in++; 3634 } else if (asoc->str_reset_seq_in - 1 == seq) { 3635 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3636 } else if (asoc->str_reset_seq_in - 2 == seq) { 3637 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3638 } else { 3639 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3640 } 3641 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED); 3642 } 3643 3644 static int 3645 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb, 3646 struct sctp_tmit_chunk *chk, 3647 struct sctp_stream_reset_tsn_request *req) 3648 { 3649 /* reset all in and out and update the tsn */ 3650 /* 3651 * A) reset my str-seq's on in and out. B) Select a receive next, 3652 * and set cum-ack to it. Also process this selected number as a 3653 * fwd-tsn as well. C) set in the response my next sending seq. 3654 */ 3655 struct sctp_forward_tsn_chunk fwdtsn; 3656 struct sctp_association *asoc = &stcb->asoc; 3657 int abort_flag = 0; 3658 uint32_t seq; 3659 3660 seq = ntohl(req->request_seq); 3661 if (asoc->str_reset_seq_in == seq) { 3662 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3663 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 3664 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3665 } else { 3666 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3667 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3668 fwdtsn.ch.chunk_flags = 0; 3669 fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1); 3670 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3671 if (abort_flag) { 3672 return (1); 3673 } 3674 asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA; 3675 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3676 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3677 } 3678 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map; 3679 asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1; 3680 memset(asoc->mapping_array, 0, asoc->mapping_array_size); 3681 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 3682 memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size); 3683 atomic_add_int(&asoc->sending_seq, 1); 3684 /* save off historical data for retrans */ 3685 asoc->last_sending_seq[1] = asoc->last_sending_seq[0]; 3686 asoc->last_sending_seq[0] = asoc->sending_seq; 3687 asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0]; 3688 asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn; 3689 sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL); 3690 sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL); 3691 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3692 sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0); 3693 } 3694 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3695 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3696 asoc->str_reset_seq_in++; 3697 } else if (asoc->str_reset_seq_in - 1 == seq) { 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 } else if (asoc->str_reset_seq_in - 2 == seq) { 3701 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1], 3702 asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]); 3703 } else { 3704 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3705 } 3706 return (0); 3707 } 3708 3709 static void 3710 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb, 3711 struct sctp_tmit_chunk *chk, 3712 struct sctp_stream_reset_out_request *req, int trunc) 3713 { 3714 uint32_t seq, tsn; 3715 int number_entries, len; 3716 struct sctp_association *asoc = &stcb->asoc; 3717 3718 seq = ntohl(req->request_seq); 3719 3720 /* now if its not a duplicate we process it */ 3721 if (asoc->str_reset_seq_in == seq) { 3722 len = ntohs(req->ph.param_length); 3723 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t)); 3724 /* 3725 * the sender is resetting, handle the list issue.. we must 3726 * a) verify if we can do the reset, if so no problem b) If 3727 * we can't do the reset we must copy the request. c) queue 3728 * it, and setup the data in processor to trigger it off 3729 * when needed and dequeue all the queued data. 3730 */ 3731 tsn = ntohl(req->send_reset_at_tsn); 3732 3733 /* move the reset action back one */ 3734 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3735 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3736 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3737 } else if (trunc) { 3738 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3739 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) { 3740 /* we can do it now */ 3741 sctp_reset_in_stream(stcb, number_entries, req->list_of_streams); 3742 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3743 } else { 3744 /* 3745 * we must queue it up and thus wait for the TSN's 3746 * to arrive that are at or before tsn 3747 */ 3748 struct sctp_stream_reset_list *liste; 3749 int siz; 3750 3751 siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t)); 3752 SCTP_MALLOC(liste, struct sctp_stream_reset_list *, 3753 siz, SCTP_M_STRESET); 3754 if (liste == NULL) { 3755 /* gak out of memory */ 3756 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3757 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3758 return; 3759 } 3760 liste->seq = seq; 3761 liste->tsn = tsn; 3762 liste->number_entries = number_entries; 3763 memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t)); 3764 TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp); 3765 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_IN_PROGRESS; 3766 } 3767 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3768 asoc->str_reset_seq_in++; 3769 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3770 /* 3771 * one seq back, just echo back last action since my 3772 * response was lost. 3773 */ 3774 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3775 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3776 /* 3777 * two seq back, just echo back last action since my 3778 * response was lost. 3779 */ 3780 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3781 } else { 3782 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3783 } 3784 } 3785 3786 static void 3787 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 3788 struct sctp_stream_reset_add_strm *str_add) 3789 { 3790 /* 3791 * Peer is requesting to add more streams. If its within our 3792 * max-streams we will allow it. 3793 */ 3794 uint32_t num_stream, i; 3795 uint32_t seq; 3796 struct sctp_association *asoc = &stcb->asoc; 3797 struct sctp_queued_to_read *ctl, *nctl; 3798 3799 /* Get the number. */ 3800 seq = ntohl(str_add->request_seq); 3801 num_stream = ntohs(str_add->number_of_streams); 3802 /* Now what would be the new total? */ 3803 if (asoc->str_reset_seq_in == seq) { 3804 num_stream += stcb->asoc.streamincnt; 3805 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3806 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 3807 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3808 } else if ((num_stream > stcb->asoc.max_inbound_streams) || 3809 (num_stream > 0xffff)) { 3810 /* We must reject it they ask for to many */ 3811 denied: 3812 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3813 } else { 3814 /* Ok, we can do that :-) */ 3815 struct sctp_stream_in *oldstrm; 3816 3817 /* save off the old */ 3818 oldstrm = stcb->asoc.strmin; 3819 SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *, 3820 (num_stream * sizeof(struct sctp_stream_in)), 3821 SCTP_M_STRMI); 3822 if (stcb->asoc.strmin == NULL) { 3823 stcb->asoc.strmin = oldstrm; 3824 goto denied; 3825 } 3826 /* copy off the old data */ 3827 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3828 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 3829 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue); 3830 stcb->asoc.strmin[i].sid = i; 3831 stcb->asoc.strmin[i].last_mid_delivered = oldstrm[i].last_mid_delivered; 3832 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started; 3833 stcb->asoc.strmin[i].pd_api_started = oldstrm[i].pd_api_started; 3834 /* now anything on those queues? */ 3835 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next_instrm, nctl) { 3836 TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next_instrm); 3837 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next_instrm); 3838 } 3839 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].uno_inqueue, next_instrm, nctl) { 3840 TAILQ_REMOVE(&oldstrm[i].uno_inqueue, ctl, next_instrm); 3841 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].uno_inqueue, ctl, next_instrm); 3842 } 3843 } 3844 /* Init the new streams */ 3845 for (i = stcb->asoc.streamincnt; i < num_stream; i++) { 3846 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 3847 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue); 3848 stcb->asoc.strmin[i].sid = i; 3849 stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff; 3850 stcb->asoc.strmin[i].pd_api_started = 0; 3851 stcb->asoc.strmin[i].delivery_started = 0; 3852 } 3853 SCTP_FREE(oldstrm, SCTP_M_STRMI); 3854 /* update the size */ 3855 stcb->asoc.streamincnt = num_stream; 3856 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3857 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 3858 } 3859 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3860 asoc->str_reset_seq_in++; 3861 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3862 /* 3863 * one seq back, just echo back last action since my 3864 * response was lost. 3865 */ 3866 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3867 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3868 /* 3869 * two seq back, just echo back last action since my 3870 * response was lost. 3871 */ 3872 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3873 } else { 3874 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3875 } 3876 } 3877 3878 static void 3879 sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 3880 struct sctp_stream_reset_add_strm *str_add) 3881 { 3882 /* 3883 * Peer is requesting to add more streams. If its within our 3884 * max-streams we will allow it. 3885 */ 3886 uint16_t num_stream; 3887 uint32_t seq; 3888 struct sctp_association *asoc = &stcb->asoc; 3889 3890 /* Get the number. */ 3891 seq = ntohl(str_add->request_seq); 3892 num_stream = ntohs(str_add->number_of_streams); 3893 /* Now what would be the new total? */ 3894 if (asoc->str_reset_seq_in == seq) { 3895 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3896 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 3897 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3898 } else if (stcb->asoc.stream_reset_outstanding) { 3899 /* We must reject it we have something pending */ 3900 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 3901 } else { 3902 /* Ok, we can do that :-) */ 3903 int mychk; 3904 3905 mychk = stcb->asoc.streamoutcnt; 3906 mychk += num_stream; 3907 if (mychk < 0x10000) { 3908 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3909 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 1, num_stream, 0, 1)) { 3910 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3911 } 3912 } else { 3913 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3914 } 3915 } 3916 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]); 3917 asoc->str_reset_seq_in++; 3918 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3919 /* 3920 * one seq back, just echo back last action since my 3921 * response was lost. 3922 */ 3923 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3924 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3925 /* 3926 * two seq back, just echo back last action since my 3927 * response was lost. 3928 */ 3929 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3930 } else { 3931 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3932 } 3933 } 3934 3935 #ifdef __GNUC__ 3936 __attribute__((noinline)) 3937 #endif 3938 static int 3939 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset, 3940 struct sctp_chunkhdr *ch_req) 3941 { 3942 uint16_t remaining_length, param_len, ptype; 3943 struct sctp_paramhdr pstore; 3944 uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE]; 3945 uint32_t seq = 0; 3946 int num_req = 0; 3947 int trunc = 0; 3948 struct sctp_tmit_chunk *chk; 3949 struct sctp_chunkhdr *ch; 3950 struct sctp_paramhdr *ph; 3951 int ret_code = 0; 3952 int num_param = 0; 3953 3954 /* now it may be a reset or a reset-response */ 3955 remaining_length = ntohs(ch_req->chunk_length) - sizeof(struct sctp_chunkhdr); 3956 3957 /* setup for adding the response */ 3958 sctp_alloc_a_chunk(stcb, chk); 3959 if (chk == NULL) { 3960 return (ret_code); 3961 } 3962 chk->copy_by_ref = 0; 3963 chk->rec.chunk_id.id = SCTP_STREAM_RESET; 3964 chk->rec.chunk_id.can_take_data = 0; 3965 chk->flags = 0; 3966 chk->asoc = &stcb->asoc; 3967 chk->no_fr_allowed = 0; 3968 chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr); 3969 chk->book_size_scale = 0; 3970 chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA); 3971 if (chk->data == NULL) { 3972 strres_nochunk: 3973 if (chk->data) { 3974 sctp_m_freem(chk->data); 3975 chk->data = NULL; 3976 } 3977 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3978 return (ret_code); 3979 } 3980 SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD); 3981 3982 /* setup chunk parameters */ 3983 chk->sent = SCTP_DATAGRAM_UNSENT; 3984 chk->snd_count = 0; 3985 chk->whoTo = NULL; 3986 3987 ch = mtod(chk->data, struct sctp_chunkhdr *); 3988 ch->chunk_type = SCTP_STREAM_RESET; 3989 ch->chunk_flags = 0; 3990 ch->chunk_length = htons(chk->send_size); 3991 SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size); 3992 offset += sizeof(struct sctp_chunkhdr); 3993 while (remaining_length >= sizeof(struct sctp_paramhdr)) { 3994 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *)&pstore); 3995 if (ph == NULL) { 3996 /* TSNH */ 3997 break; 3998 } 3999 param_len = ntohs(ph->param_length); 4000 if ((param_len > remaining_length) || 4001 (param_len < (sizeof(struct sctp_paramhdr) + sizeof(uint32_t)))) { 4002 /* bad parameter length */ 4003 break; 4004 } 4005 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, sizeof(cstore)), 4006 (uint8_t *)&cstore); 4007 if (ph == NULL) { 4008 /* TSNH */ 4009 break; 4010 } 4011 ptype = ntohs(ph->param_type); 4012 num_param++; 4013 if (param_len > sizeof(cstore)) { 4014 trunc = 1; 4015 } else { 4016 trunc = 0; 4017 } 4018 if (num_param > SCTP_MAX_RESET_PARAMS) { 4019 /* hit the max of parameters already sorry.. */ 4020 break; 4021 } 4022 if (ptype == SCTP_STR_RESET_OUT_REQUEST) { 4023 struct sctp_stream_reset_out_request *req_out; 4024 4025 if (param_len < sizeof(struct sctp_stream_reset_out_request)) { 4026 break; 4027 } 4028 req_out = (struct sctp_stream_reset_out_request *)ph; 4029 num_req++; 4030 if (stcb->asoc.stream_reset_outstanding) { 4031 seq = ntohl(req_out->response_seq); 4032 if (seq == stcb->asoc.str_reset_seq_out) { 4033 /* implicit ack */ 4034 (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL); 4035 } 4036 } 4037 sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc); 4038 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) { 4039 struct sctp_stream_reset_add_strm *str_add; 4040 4041 if (param_len < sizeof(struct sctp_stream_reset_add_strm)) { 4042 break; 4043 } 4044 str_add = (struct sctp_stream_reset_add_strm *)ph; 4045 num_req++; 4046 sctp_handle_str_reset_add_strm(stcb, chk, str_add); 4047 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) { 4048 struct sctp_stream_reset_add_strm *str_add; 4049 4050 if (param_len < sizeof(struct sctp_stream_reset_add_strm)) { 4051 break; 4052 } 4053 str_add = (struct sctp_stream_reset_add_strm *)ph; 4054 num_req++; 4055 sctp_handle_str_reset_add_out_strm(stcb, chk, str_add); 4056 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) { 4057 struct sctp_stream_reset_in_request *req_in; 4058 4059 num_req++; 4060 req_in = (struct sctp_stream_reset_in_request *)ph; 4061 sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc); 4062 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) { 4063 struct sctp_stream_reset_tsn_request *req_tsn; 4064 4065 num_req++; 4066 req_tsn = (struct sctp_stream_reset_tsn_request *)ph; 4067 if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) { 4068 ret_code = 1; 4069 goto strres_nochunk; 4070 } 4071 /* no more */ 4072 break; 4073 } else if (ptype == SCTP_STR_RESET_RESPONSE) { 4074 struct sctp_stream_reset_response *resp; 4075 uint32_t result; 4076 4077 if (param_len < sizeof(struct sctp_stream_reset_response)) { 4078 break; 4079 } 4080 resp = (struct sctp_stream_reset_response *)ph; 4081 seq = ntohl(resp->response_seq); 4082 result = ntohl(resp->result); 4083 if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) { 4084 ret_code = 1; 4085 goto strres_nochunk; 4086 } 4087 } else { 4088 break; 4089 } 4090 offset += SCTP_SIZE32(param_len); 4091 if (remaining_length >= SCTP_SIZE32(param_len)) { 4092 remaining_length -= SCTP_SIZE32(param_len); 4093 } else { 4094 remaining_length = 0; 4095 } 4096 } 4097 if (num_req == 0) { 4098 /* we have no response free the stuff */ 4099 goto strres_nochunk; 4100 } 4101 /* ok we have a chunk to link in */ 4102 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, 4103 chk, 4104 sctp_next); 4105 stcb->asoc.ctrl_queue_cnt++; 4106 return (ret_code); 4107 } 4108 4109 /* 4110 * Handle a router or endpoints report of a packet loss, there are two ways 4111 * to handle this, either we get the whole packet and must disect it 4112 * ourselves (possibly with truncation and or corruption) or it is a summary 4113 * from a middle box that did the disectting for us. 4114 */ 4115 static void 4116 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp, 4117 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 4118 { 4119 struct sctp_chunk_desc desc; 4120 struct sctp_chunkhdr *chk_hdr; 4121 struct sctp_data_chunk *data_chunk; 4122 struct sctp_idata_chunk *idata_chunk; 4123 uint32_t bottle_bw, on_queue; 4124 uint32_t offset, chk_len; 4125 uint16_t trunc_len; 4126 uint16_t pktdrp_len; 4127 uint8_t pktdrp_flags; 4128 4129 KASSERT(sizeof(struct sctp_pktdrop_chunk) <= limit, 4130 ("PKTDROP chunk too small")); 4131 pktdrp_flags = cp->ch.chunk_flags; 4132 pktdrp_len = ntohs(cp->ch.chunk_length); 4133 KASSERT(limit <= pktdrp_len, ("Inconsistent limit")); 4134 if (pktdrp_flags & SCTP_PACKET_TRUNCATED) { 4135 trunc_len = ntohs(cp->trunc_len); 4136 if (trunc_len <= pktdrp_len - sizeof(struct sctp_pktdrop_chunk)) { 4137 /* The peer plays games with us. */ 4138 return; 4139 } 4140 } else { 4141 trunc_len = 0; 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 data_processed = 1; 5567 /* 5568 * Anything important needs to have been m_copy'ed in 5569 * process_data 5570 */ 5571 } 5572 5573 /* take care of ecn */ 5574 if ((data_processed == 1) && 5575 (stcb->asoc.ecn_supported == 1) && 5576 ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) { 5577 /* Yep, we need to add a ECNE */ 5578 sctp_send_ecn_echo(stcb, net, high_tsn); 5579 } 5580 5581 if ((data_processed == 0) && (fwd_tsn_seen)) { 5582 int was_a_gap; 5583 uint32_t highest_tsn; 5584 5585 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) { 5586 highest_tsn = stcb->asoc.highest_tsn_inside_nr_map; 5587 } else { 5588 highest_tsn = stcb->asoc.highest_tsn_inside_map; 5589 } 5590 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn); 5591 stcb->asoc.send_sack = 1; 5592 sctp_sack_check(stcb, was_a_gap); 5593 } else if (fwd_tsn_seen) { 5594 stcb->asoc.send_sack = 1; 5595 } 5596 /* trigger send of any chunks in queue... */ 5597 trigger_send: 5598 #ifdef SCTP_AUDITING_ENABLED 5599 sctp_audit_log(0xE0, 2); 5600 sctp_auditing(1, inp, stcb, net); 5601 #endif 5602 SCTPDBG(SCTP_DEBUG_INPUT1, 5603 "Check for chunk output prw:%d tqe:%d tf=%d\n", 5604 stcb->asoc.peers_rwnd, 5605 TAILQ_EMPTY(&stcb->asoc.control_send_queue), 5606 stcb->asoc.total_flight); 5607 un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight); 5608 if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 5609 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq; 5610 } 5611 if (!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue) || 5612 cnt_ctrl_ready || 5613 stcb->asoc.trigger_reset || 5614 ((un_sent > 0) && 5615 (stcb->asoc.peers_rwnd > 0 || stcb->asoc.total_flight == 0))) { 5616 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n"); 5617 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 5618 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n"); 5619 } 5620 #ifdef SCTP_AUDITING_ENABLED 5621 sctp_audit_log(0xE0, 3); 5622 sctp_auditing(2, inp, stcb, net); 5623 #endif 5624 out: 5625 if (stcb != NULL) { 5626 SCTP_TCB_UNLOCK(stcb); 5627 } 5628 if (inp_decr != NULL) { 5629 /* reduce ref-count */ 5630 SCTP_INP_WLOCK(inp_decr); 5631 SCTP_INP_DECR_REF(inp_decr); 5632 SCTP_INP_WUNLOCK(inp_decr); 5633 } 5634 return; 5635 } 5636 5637 #ifdef INET 5638 void 5639 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port) 5640 { 5641 struct mbuf *m; 5642 int iphlen; 5643 uint32_t vrf_id = 0; 5644 uint8_t ecn_bits; 5645 struct sockaddr_in src, dst; 5646 struct ip *ip; 5647 struct sctphdr *sh; 5648 struct sctp_chunkhdr *ch; 5649 int length, offset; 5650 uint8_t compute_crc; 5651 uint32_t mflowid; 5652 uint8_t mflowtype; 5653 uint16_t fibnum; 5654 5655 iphlen = off; 5656 if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) { 5657 SCTP_RELEASE_PKT(i_pak); 5658 return; 5659 } 5660 m = SCTP_HEADER_TO_CHAIN(i_pak); 5661 #ifdef SCTP_MBUF_LOGGING 5662 /* Log in any input mbufs */ 5663 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5664 sctp_log_mbc(m, SCTP_MBUF_INPUT); 5665 } 5666 #endif 5667 #ifdef SCTP_PACKET_LOGGING 5668 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) { 5669 sctp_packet_log(m); 5670 } 5671 #endif 5672 SCTPDBG(SCTP_DEBUG_CRCOFFLOAD, 5673 "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n", 5674 m->m_pkthdr.len, 5675 if_name(m->m_pkthdr.rcvif), 5676 (int)m->m_pkthdr.csum_flags, CSUM_BITS); 5677 mflowid = m->m_pkthdr.flowid; 5678 mflowtype = M_HASHTYPE_GET(m); 5679 fibnum = M_GETFIB(m); 5680 SCTP_STAT_INCR(sctps_recvpackets); 5681 SCTP_STAT_INCR_COUNTER64(sctps_inpackets); 5682 /* Get IP, SCTP, and first chunk header together in the first mbuf. */ 5683 offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr); 5684 if (SCTP_BUF_LEN(m) < offset) { 5685 if ((m = m_pullup(m, offset)) == NULL) { 5686 SCTP_STAT_INCR(sctps_hdrops); 5687 return; 5688 } 5689 } 5690 ip = mtod(m, struct ip *); 5691 sh = (struct sctphdr *)((caddr_t)ip + iphlen); 5692 ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr)); 5693 offset -= sizeof(struct sctp_chunkhdr); 5694 memset(&src, 0, sizeof(struct sockaddr_in)); 5695 src.sin_family = AF_INET; 5696 src.sin_len = sizeof(struct sockaddr_in); 5697 src.sin_port = sh->src_port; 5698 src.sin_addr = ip->ip_src; 5699 memset(&dst, 0, sizeof(struct sockaddr_in)); 5700 dst.sin_family = AF_INET; 5701 dst.sin_len = sizeof(struct sockaddr_in); 5702 dst.sin_port = sh->dest_port; 5703 dst.sin_addr = ip->ip_dst; 5704 length = ntohs(ip->ip_len); 5705 /* Validate mbuf chain length with IP payload length. */ 5706 if (SCTP_HEADER_LEN(m) != length) { 5707 SCTPDBG(SCTP_DEBUG_INPUT1, 5708 "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m)); 5709 SCTP_STAT_INCR(sctps_hdrops); 5710 goto out; 5711 } 5712 /* SCTP does not allow broadcasts or multicasts */ 5713 if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) { 5714 goto out; 5715 } 5716 if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) { 5717 goto out; 5718 } 5719 ecn_bits = ip->ip_tos; 5720 if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) { 5721 SCTP_STAT_INCR(sctps_recvhwcrc); 5722 compute_crc = 0; 5723 } else { 5724 SCTP_STAT_INCR(sctps_recvswcrc); 5725 compute_crc = 1; 5726 } 5727 sctp_common_input_processing(&m, iphlen, offset, length, 5728 (struct sockaddr *)&src, 5729 (struct sockaddr *)&dst, 5730 sh, ch, 5731 compute_crc, 5732 ecn_bits, 5733 mflowtype, mflowid, fibnum, 5734 vrf_id, port); 5735 out: 5736 if (m) { 5737 sctp_m_freem(m); 5738 } 5739 return; 5740 } 5741 5742 #if defined(SCTP_MCORE_INPUT) && defined(SMP) 5743 extern int *sctp_cpuarry; 5744 #endif 5745 5746 int 5747 sctp_input(struct mbuf **mp, int *offp, int proto SCTP_UNUSED) 5748 { 5749 struct mbuf *m; 5750 int off; 5751 5752 m = *mp; 5753 off = *offp; 5754 #if defined(SCTP_MCORE_INPUT) && defined(SMP) 5755 if (mp_ncpus > 1) { 5756 struct ip *ip; 5757 struct sctphdr *sh; 5758 int offset; 5759 int cpu_to_use; 5760 uint32_t flowid, tag; 5761 5762 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) { 5763 flowid = m->m_pkthdr.flowid; 5764 } else { 5765 /* 5766 * No flow id built by lower layers fix it so we 5767 * create one. 5768 */ 5769 offset = off + sizeof(struct sctphdr); 5770 if (SCTP_BUF_LEN(m) < offset) { 5771 if ((m = m_pullup(m, offset)) == NULL) { 5772 SCTP_STAT_INCR(sctps_hdrops); 5773 return (IPPROTO_DONE); 5774 } 5775 } 5776 ip = mtod(m, struct ip *); 5777 sh = (struct sctphdr *)((caddr_t)ip + off); 5778 tag = htonl(sh->v_tag); 5779 flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port); 5780 m->m_pkthdr.flowid = flowid; 5781 M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE_HASH); 5782 } 5783 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus]; 5784 sctp_queue_to_mcore(m, off, cpu_to_use); 5785 return (IPPROTO_DONE); 5786 } 5787 #endif 5788 sctp_input_with_port(m, off, 0); 5789 return (IPPROTO_DONE); 5790 } 5791 #endif 5792