sctp_input.c revision 164181
1189251Ssam/*- 2189251Ssam * Copyright (c) 2001-2006, Cisco Systems, Inc. All rights reserved. 3189251Ssam * 4189251Ssam * Redistribution and use in source and binary forms, with or without 5252726Srpaulo * modification, are permitted provided that the following conditions are met: 6252726Srpaulo * 7189251Ssam * a) Redistributions of source code must retain the above copyright notice, 8189251Ssam * this list of conditions and the following disclaimer. 9189251Ssam * 10189251Ssam * b) Redistributions in binary form must reproduce the above copyright 11189251Ssam * notice, this list of conditions and the following disclaimer in 12189251Ssam * the documentation and/or other materials provided with the distribution. 13189251Ssam * 14189251Ssam * c) Neither the name of Cisco Systems, Inc. nor the names of its 15189251Ssam * contributors may be used to endorse or promote products derived 16189251Ssam * from this software without specific prior written permission. 17189251Ssam * 18189251Ssam * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19189251Ssam * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 20189251Ssam * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21189251Ssam * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 22189251Ssam * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23189251Ssam * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24189251Ssam * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25189251Ssam * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26189251Ssam * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27189251Ssam * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 28189251Ssam * THE POSSIBILITY OF SUCH DAMAGE. 29189251Ssam */ 30189251Ssam 31189251Ssam/* $KAME: sctp_input.c,v 1.27 2005/03/06 16:04:17 itojun Exp $ */ 32189251Ssam 33189251Ssam#include <sys/cdefs.h> 34189251Ssam__FBSDID("$FreeBSD: head/sys/netinet/sctp_input.c 164181 2006-11-11 15:59:01Z rrs $"); 35189251Ssam 36189251Ssam#include "opt_ipsec.h" 37189251Ssam#include "opt_compat.h" 38189251Ssam#include "opt_inet6.h" 39189251Ssam#include "opt_inet.h" 40189251Ssam#include "opt_sctp.h" 41189251Ssam 42189251Ssam#include <sys/param.h> 43189251Ssam#include <sys/systm.h> 44189251Ssam#include <sys/malloc.h> 45189251Ssam#include <sys/mbuf.h> 46189251Ssam#include <sys/socket.h> 47189251Ssam#include <sys/socketvar.h> 48189251Ssam#include <sys/sysctl.h> 49189251Ssam#include <sys/domain.h> 50189251Ssam#include <sys/protosw.h> 51189251Ssam#include <sys/kernel.h> 52189251Ssam#include <sys/errno.h> 53189251Ssam#include <sys/syslog.h> 54189251Ssam 55189251Ssam#include <sys/limits.h> 56189251Ssam#include <machine/cpu.h> 57189251Ssam 58189251Ssam#include <net/if.h> 59189251Ssam#include <net/route.h> 60#include <net/if_types.h> 61 62#include <netinet/in.h> 63#include <netinet/in_systm.h> 64#include <netinet/ip.h> 65#include <netinet/in_pcb.h> 66#include <netinet/in_var.h> 67#include <netinet/ip_var.h> 68 69#ifdef INET6 70#include <netinet/ip6.h> 71#include <netinet6/ip6_var.h> 72#endif /* INET6 */ 73 74#include <netinet/ip_icmp.h> 75#include <netinet/icmp_var.h> 76 77#include <netinet/sctp_os.h> 78#include <netinet/sctp_var.h> 79#include <netinet/sctp_pcb.h> 80#include <netinet/sctp_header.h> 81#include <netinet/sctputil.h> 82#include <netinet/sctp_output.h> 83#include <netinet/sctp_input.h> 84#include <netinet/sctp_auth.h> 85#include <netinet/sctp_indata.h> 86#include <netinet/sctp_asconf.h> 87 88#include <netinet/ip_options.h> 89 90 91#ifdef IPSEC 92#include <netinet6/ipsec.h> 93#include <netkey/key.h> 94#endif /* IPSEC */ 95 96 97#ifdef SCTP_DEBUG 98extern uint32_t sctp_debug_on; 99 100#endif 101 102 103static void 104sctp_stop_all_cookie_timers(struct sctp_tcb *stcb) 105{ 106 struct sctp_nets *net; 107 108 SCTP_TCB_LOCK_ASSERT(stcb); 109 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 110 if ((callout_pending(&net->rxt_timer.timer)) && 111 (net->rxt_timer.type == SCTP_TIMER_TYPE_COOKIE)) { 112 sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE, 113 stcb->sctp_ep, 114 stcb, 115 net); 116 } 117 } 118} 119 120/* INIT handler */ 121static void 122sctp_handle_init(struct mbuf *m, int iphlen, int offset, struct sctphdr *sh, 123 struct sctp_init_chunk *cp, struct sctp_inpcb *inp, struct sctp_tcb *stcb, 124 struct sctp_nets *net) 125{ 126 struct sctp_init *init; 127 struct mbuf *op_err; 128 uint32_t init_limit; 129 130#ifdef SCTP_DEBUG 131 if (sctp_debug_on & SCTP_DEBUG_INPUT2) { 132 printf("sctp_handle_init: handling INIT tcb:%p\n", stcb); 133 } 134#endif 135 op_err = NULL; 136 init = &cp->init; 137 /* First are we accepting? */ 138 if ((inp->sctp_socket->so_qlimit == 0) && (stcb == NULL)) { 139#ifdef SCTP_DEBUG 140 if (sctp_debug_on & SCTP_DEBUG_INPUT2) { 141 printf("sctp_handle_init: Abort, so_qlimit:%d\n", inp->sctp_socket->so_qlimit); 142 } 143#endif 144 /* 145 * FIX ME ?? What about TCP model and we have a 146 * match/restart case? 147 */ 148 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err); 149 return; 150 } 151 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_chunk)) { 152 /* Invalid length */ 153 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 154 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err); 155 return; 156 } 157 /* validate parameters */ 158 if (init->initiate_tag == 0) { 159 /* protocol error... send abort */ 160 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 161 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err); 162 return; 163 } 164 if (ntohl(init->a_rwnd) < SCTP_MIN_RWND) { 165 /* invalid parameter... send abort */ 166 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 167 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err); 168 return; 169 } 170 if (init->num_inbound_streams == 0) { 171 /* protocol error... send abort */ 172 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 173 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err); 174 return; 175 } 176 if (init->num_outbound_streams == 0) { 177 /* protocol error... send abort */ 178 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 179 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err); 180 return; 181 } 182 init_limit = offset + ntohs(cp->ch.chunk_length); 183 if (sctp_validate_init_auth_params(m, offset + sizeof(*cp), 184 init_limit)) { 185 /* auth parameter(s) error... send abort */ 186 sctp_abort_association(inp, stcb, m, iphlen, sh, NULL); 187 return; 188 } 189 /* send an INIT-ACK w/cookie */ 190#ifdef SCTP_DEBUG 191 if (sctp_debug_on & SCTP_DEBUG_INPUT3) { 192 printf("sctp_handle_init: sending INIT-ACK\n"); 193 } 194#endif 195 sctp_send_initiate_ack(inp, stcb, m, iphlen, offset, sh, cp); 196} 197 198/* 199 * process peer "INIT/INIT-ACK" chunk returns value < 0 on error 200 */ 201static int 202sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb, 203 struct sctp_nets *net) 204{ 205 struct sctp_init *init; 206 struct sctp_association *asoc; 207 struct sctp_nets *lnet; 208 unsigned int i; 209 210 init = &cp->init; 211 asoc = &stcb->asoc; 212 /* save off parameters */ 213 asoc->peer_vtag = ntohl(init->initiate_tag); 214 asoc->peers_rwnd = ntohl(init->a_rwnd); 215 if (TAILQ_FIRST(&asoc->nets)) { 216 /* update any ssthresh's that may have a default */ 217 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) { 218 lnet->ssthresh = asoc->peers_rwnd; 219 220#if defined(SCTP_CWND_MONITOR) || defined(SCTP_CWND_LOGGING) 221 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION); 222#endif 223 224 } 225 } 226 SCTP_TCB_SEND_LOCK(stcb); 227 if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) { 228 unsigned int newcnt; 229 struct sctp_stream_out *outs; 230 struct sctp_stream_queue_pending *sp; 231 232 /* cut back on number of streams */ 233 newcnt = ntohs(init->num_inbound_streams); 234 /* This if is probably not needed but I am cautious */ 235 if (asoc->strmout) { 236 /* First make sure no data chunks are trapped */ 237 for (i = newcnt; i < asoc->pre_open_streams; i++) { 238 outs = &asoc->strmout[i]; 239 sp = TAILQ_FIRST(&outs->outqueue); 240 while (sp) { 241 TAILQ_REMOVE(&outs->outqueue, sp, 242 next); 243 asoc->stream_queue_cnt--; 244 sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL, 245 stcb, SCTP_NOTIFY_DATAGRAM_UNSENT, 246 sp); 247 if (sp->data) { 248 sctp_m_freem(sp->data); 249 sp->data = NULL; 250 } 251 sctp_free_remote_addr(sp->net); 252 sp->net = NULL; 253 /* Free the chunk */ 254 printf("sp:%p tcb:%p weird free case\n", 255 sp, stcb); 256 257 sctp_free_a_strmoq(stcb, sp); 258 sp = TAILQ_FIRST(&outs->outqueue); 259 } 260 } 261 } 262 /* cut back the count and abandon the upper streams */ 263 asoc->pre_open_streams = newcnt; 264 } 265 SCTP_TCB_SEND_UNLOCK(stcb); 266 asoc->streamoutcnt = asoc->pre_open_streams; 267 /* init tsn's */ 268 asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1; 269#ifdef SCTP_MAP_LOGGING 270 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 271#endif 272 /* This is the next one we expect */ 273 asoc->str_reset_seq_in = asoc->asconf_seq_in + 1; 274 275 asoc->mapping_array_base_tsn = ntohl(init->initial_tsn); 276 asoc->cumulative_tsn = asoc->asconf_seq_in; 277 asoc->last_echo_tsn = asoc->asconf_seq_in; 278 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 279 /* open the requested streams */ 280 if (asoc->strmin != NULL) { 281 /* Free the old ones */ 282 struct sctp_queued_to_read *ctl; 283 284 for (i = 0; i < asoc->streamincnt; i++) { 285 ctl = TAILQ_FIRST(&asoc->strmin[i].inqueue); 286 while (ctl) { 287 TAILQ_REMOVE(&asoc->strmin[i].inqueue, ctl, next); 288 sctp_free_remote_addr(ctl->whoFrom); 289 sctp_m_freem(ctl->data); 290 ctl->data = NULL; 291 sctp_free_a_readq(stcb, ctl); 292 ctl = TAILQ_FIRST(&asoc->strmin[i].inqueue); 293 } 294 } 295 SCTP_FREE(asoc->strmin); 296 } 297 asoc->streamincnt = ntohs(init->num_outbound_streams); 298 if (asoc->streamincnt > MAX_SCTP_STREAMS) { 299 asoc->streamincnt = MAX_SCTP_STREAMS; 300 } 301 SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt * 302 sizeof(struct sctp_stream_in), "StreamsIn"); 303 if (asoc->strmin == NULL) { 304 /* we didn't get memory for the streams! */ 305#ifdef SCTP_DEBUG 306 if (sctp_debug_on & SCTP_DEBUG_INPUT2) { 307 printf("process_init: couldn't get memory for the streams!\n"); 308 } 309#endif 310 return (-1); 311 } 312 for (i = 0; i < asoc->streamincnt; i++) { 313 asoc->strmin[i].stream_no = i; 314 asoc->strmin[i].last_sequence_delivered = 0xffff; 315 /* 316 * U-stream ranges will be set when the cookie is unpacked. 317 * Or for the INIT sender they are un set (if pr-sctp not 318 * supported) when the INIT-ACK arrives. 319 */ 320 TAILQ_INIT(&asoc->strmin[i].inqueue); 321 /* 322 * we are not on any wheel, pr-sctp streams will go on the 323 * wheel when they have data waiting for reorder. 324 */ 325 asoc->strmin[i].next_spoke.tqe_next = 0; 326 asoc->strmin[i].next_spoke.tqe_prev = 0; 327 } 328 329 /* 330 * load_address_from_init will put the addresses into the 331 * association when the COOKIE is processed or the INIT-ACK is 332 * processed. Both types of COOKIE's existing and new call this 333 * routine. It will remove addresses that are no longer in the 334 * association (for the restarting case where addresses are 335 * removed). Up front when the INIT arrives we will discard it if it 336 * is a restart and new addresses have been added. 337 */ 338 return (0); 339} 340 341/* 342 * INIT-ACK message processing/consumption returns value < 0 on error 343 */ 344static int 345sctp_process_init_ack(struct mbuf *m, int iphlen, int offset, 346 struct sctphdr *sh, struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 347 struct sctp_nets *net) 348{ 349 struct sctp_association *asoc; 350 struct mbuf *op_err; 351 int retval, abort_flag; 352 uint32_t initack_limit; 353 354 /* First verify that we have no illegal param's */ 355 abort_flag = 0; 356 op_err = NULL; 357 358 op_err = sctp_arethere_unrecognized_parameters(m, 359 (offset + sizeof(struct sctp_init_chunk)), 360 &abort_flag, (struct sctp_chunkhdr *)cp); 361 if (abort_flag) { 362 /* Send an abort and notify peer */ 363 if (op_err != NULL) { 364 sctp_send_operr_to(m, iphlen, op_err, cp->init.initiate_tag); 365 } else { 366 /* 367 * Just notify (abort_assoc does this if we send an 368 * abort). 369 */ 370 sctp_abort_notification(stcb, 0); 371 /* 372 * No sense in further INIT's since we will get the 373 * same param back 374 */ 375 sctp_free_assoc(stcb->sctp_ep, stcb, 0); 376 } 377 return (-1); 378 } 379 asoc = &stcb->asoc; 380 /* process the peer's parameters in the INIT-ACK */ 381 retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb, net); 382 if (retval < 0) { 383 return (retval); 384 } 385 initack_limit = offset + ntohs(cp->ch.chunk_length); 386 /* load all addresses */ 387 if ((retval = sctp_load_addresses_from_init(stcb, m, iphlen, 388 (offset + sizeof(struct sctp_init_chunk)), initack_limit, sh, 389 NULL))) { 390 /* Huh, we should abort */ 391#ifdef SCTP_DEBUG 392 if (sctp_debug_on & SCTP_DEBUG_INPUT1) { 393 printf("Load addresses from INIT causes an abort %d\n", retval); 394 } 395#endif 396 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 397 NULL); 398 return (-1); 399 } 400 stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs, 401 stcb->asoc.local_hmacs); 402 if (op_err) { 403 sctp_queue_op_err(stcb, op_err); 404 /* queuing will steal away the mbuf chain to the out queue */ 405 op_err = NULL; 406 } 407 /* extract the cookie and queue it to "echo" it back... */ 408 stcb->asoc.overall_error_count = 0; 409 net->error_count = 0; 410 411 /* 412 * Cancel the INIT timer, We do this first before queueing the 413 * cookie. We always cancel at the primary to assue that we are 414 * canceling the timer started by the INIT which always goes to the 415 * primary. 416 */ 417 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb, 418 asoc->primary_destination); 419 420 retval = sctp_send_cookie_echo(m, offset, stcb, net); 421 if (retval < 0) { 422 /* 423 * No cookie, we probably should send a op error. But in any 424 * case if there is no cookie in the INIT-ACK, we can 425 * abandon the peer, its broke. 426 */ 427 if (retval == -3) { 428 /* We abort with an error of missing mandatory param */ 429 struct mbuf *op_err; 430 431 op_err = 432 sctp_generate_invmanparam(SCTP_CAUSE_MISSING_PARAM); 433 if (op_err) { 434 /* 435 * Expand beyond to include the mandatory 436 * param cookie 437 */ 438 struct sctp_inv_mandatory_param *mp; 439 440 op_err->m_len = 441 sizeof(struct sctp_inv_mandatory_param); 442 mp = mtod(op_err, 443 struct sctp_inv_mandatory_param *); 444 /* Subtract the reserved param */ 445 mp->length = 446 htons(sizeof(struct sctp_inv_mandatory_param) - 2); 447 mp->num_param = htonl(1); 448 mp->param = htons(SCTP_STATE_COOKIE); 449 mp->resv = 0; 450 } 451 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 452 sh, op_err); 453 } 454 return (retval); 455 } 456 /* calculate the RTO */ 457 net->RTO = sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered); 458 459 return (0); 460} 461 462static void 463sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp, 464 struct sctp_tcb *stcb, struct sctp_nets *net) 465{ 466 struct sockaddr_storage store; 467 struct sockaddr_in *sin; 468 struct sockaddr_in6 *sin6; 469 struct sctp_nets *r_net; 470 struct timeval tv; 471 472 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) { 473 /* Invalid length */ 474 return; 475 } 476 sin = (struct sockaddr_in *)&store; 477 sin6 = (struct sockaddr_in6 *)&store; 478 479 memset(&store, 0, sizeof(store)); 480 if (cp->heartbeat.hb_info.addr_family == AF_INET && 481 cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) { 482 sin->sin_family = cp->heartbeat.hb_info.addr_family; 483 sin->sin_len = cp->heartbeat.hb_info.addr_len; 484 sin->sin_port = stcb->rport; 485 memcpy(&sin->sin_addr, cp->heartbeat.hb_info.address, 486 sizeof(sin->sin_addr)); 487 } else if (cp->heartbeat.hb_info.addr_family == AF_INET6 && 488 cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) { 489 sin6->sin6_family = cp->heartbeat.hb_info.addr_family; 490 sin6->sin6_len = cp->heartbeat.hb_info.addr_len; 491 sin6->sin6_port = stcb->rport; 492 memcpy(&sin6->sin6_addr, cp->heartbeat.hb_info.address, 493 sizeof(sin6->sin6_addr)); 494 } else { 495 return; 496 } 497 r_net = sctp_findnet(stcb, (struct sockaddr *)sin); 498 if (r_net == NULL) { 499#ifdef SCTP_DEBUG 500 if (sctp_debug_on & SCTP_DEBUG_INPUT1) { 501 printf("Huh? I can't find the address I sent it to, discard\n"); 502 } 503#endif 504 return; 505 } 506 if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) && 507 (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) && 508 (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) { 509 /* 510 * If the its a HB and it's random value is correct when can 511 * confirm the destination. 512 */ 513 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 514 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 515 stcb, 0, (void *)r_net); 516 } 517 r_net->error_count = 0; 518 r_net->hb_responded = 1; 519 tv.tv_sec = cp->heartbeat.hb_info.time_value_1; 520 tv.tv_usec = cp->heartbeat.hb_info.time_value_2; 521 if (r_net->dest_state & SCTP_ADDR_NOT_REACHABLE) { 522 r_net->dest_state &= ~SCTP_ADDR_NOT_REACHABLE; 523 r_net->dest_state |= SCTP_ADDR_REACHABLE; 524 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb, 525 SCTP_HEARTBEAT_SUCCESS, (void *)r_net); 526 /* now was it the primary? if so restore */ 527 if (r_net->dest_state & SCTP_ADDR_WAS_PRIMARY) { 528 sctp_set_primary_addr(stcb, (struct sockaddr *)NULL, r_net); 529 } 530 } 531 /* Now lets do a RTO with this */ 532 r_net->RTO = sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv); 533} 534 535static void 536sctp_handle_abort(struct sctp_abort_chunk *cp, 537 struct sctp_tcb *stcb, struct sctp_nets *net) 538{ 539 540#ifdef SCTP_DEBUG 541 if (sctp_debug_on & SCTP_DEBUG_INPUT2) { 542 printf("sctp_handle_abort: handling ABORT\n"); 543 } 544#endif 545 if (stcb == NULL) 546 return; 547 /* verify that the destination addr is in the association */ 548 /* ignore abort for addresses being deleted */ 549 550 /* stop any receive timers */ 551 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net); 552 /* notify user of the abort and clean up... */ 553 sctp_abort_notification(stcb, 0); 554 /* free the tcb */ 555 SCTP_STAT_INCR_COUNTER32(sctps_aborted); 556 if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) || 557 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 558 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 559 } 560 sctp_free_assoc(stcb->sctp_ep, stcb, 0); 561#ifdef SCTP_DEBUG 562 if (sctp_debug_on & SCTP_DEBUG_INPUT2) { 563 printf("sctp_handle_abort: finished\n"); 564 } 565#endif 566} 567 568static void 569sctp_handle_shutdown(struct sctp_shutdown_chunk *cp, 570 struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag) 571{ 572 struct sctp_association *asoc; 573 int some_on_streamwheel; 574 575#ifdef SCTP_DEBUG 576 if (sctp_debug_on & SCTP_DEBUG_INPUT2) { 577 printf("sctp_handle_shutdown: handling SHUTDOWN\n"); 578 } 579#endif 580 if (stcb == NULL) 581 return; 582 583 if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_WAIT) || 584 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) { 585 return; 586 } 587 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) { 588 /* Shutdown NOT the expected size */ 589 return; 590 } else { 591 sctp_update_acked(stcb, cp, net, abort_flag); 592 } 593 asoc = &stcb->asoc; 594 if (stcb->asoc.control_pdapi) { 595 /* 596 * With a normal shutdown we assume the end of last record. 597 */ 598 SCTP_INP_READ_LOCK(stcb->sctp_ep); 599 stcb->asoc.control_pdapi->end_added = 1; 600 stcb->asoc.control_pdapi->pdapi_aborted = 1; 601 if (stcb->asoc.control_pdapi->tail_mbuf) { 602 stcb->asoc.control_pdapi->tail_mbuf->m_flags |= M_EOR; 603 } 604 stcb->asoc.control_pdapi = NULL; 605 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 606 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 607 } 608 /* goto SHUTDOWN_RECEIVED state to block new requests */ 609 if (stcb->sctp_socket) { 610 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) && 611 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) { 612 asoc->state = SCTP_STATE_SHUTDOWN_RECEIVED; 613 /* 614 * notify upper layer that peer has initiated a 615 * shutdown 616 */ 617 sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL); 618 619 /* reset time */ 620 SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 621 } 622 } 623 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) { 624 /* 625 * stop the shutdown timer, since we WILL move to 626 * SHUTDOWN-ACK-SENT. 627 */ 628 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net); 629 } 630 /* Now are we there yet? */ 631 some_on_streamwheel = 0; 632 if (!TAILQ_EMPTY(&asoc->out_wheel)) { 633 /* Check to see if some data queued */ 634 struct sctp_stream_out *outs; 635 636 TAILQ_FOREACH(outs, &asoc->out_wheel, next_spoke) { 637 if (!TAILQ_EMPTY(&outs->outqueue)) { 638 some_on_streamwheel = 1; 639 break; 640 } 641 } 642 } 643 if (!TAILQ_EMPTY(&asoc->send_queue) || 644 !TAILQ_EMPTY(&asoc->sent_queue) || 645 some_on_streamwheel) { 646 /* By returning we will push more data out */ 647 return; 648 } else { 649 /* no outstanding data to send, so move on... */ 650 /* send SHUTDOWN-ACK */ 651 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination); 652 /* move to SHUTDOWN-ACK-SENT state */ 653 if (asoc->state == SCTP_STATE_SHUTDOWN_RECEIVED) { 654 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 655 } 656 asoc->state = SCTP_STATE_SHUTDOWN_ACK_SENT; 657 658 /* start SHUTDOWN timer */ 659 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, 660 stcb, net); 661 } 662} 663 664static void 665sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp, 666 struct sctp_tcb *stcb, struct sctp_nets *net) 667{ 668 struct sctp_association *asoc; 669 670#ifdef SCTP_DEBUG 671 if (sctp_debug_on & SCTP_DEBUG_INPUT2) { 672 printf("sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n"); 673 } 674#endif 675 if (stcb == NULL) 676 return; 677 678 asoc = &stcb->asoc; 679 /* process according to association state */ 680 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) && 681 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) { 682 /* unexpected SHUTDOWN-ACK... so ignore... */ 683 SCTP_TCB_UNLOCK(stcb); 684 return; 685 } 686 if (stcb->asoc.control_pdapi) { 687 /* 688 * With a normal shutdown we assume the end of last record. 689 */ 690 SCTP_INP_READ_LOCK(stcb->sctp_ep); 691 stcb->asoc.control_pdapi->end_added = 1; 692 stcb->asoc.control_pdapi->pdapi_aborted = 1; 693 if (stcb->asoc.control_pdapi->tail_mbuf) { 694 stcb->asoc.control_pdapi->tail_mbuf->m_flags |= M_EOR; 695 } 696 stcb->asoc.control_pdapi = NULL; 697 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 698 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 699 } 700 /* are the queues empty? */ 701 if (!TAILQ_EMPTY(&asoc->send_queue) || 702 !TAILQ_EMPTY(&asoc->sent_queue) || 703 !TAILQ_EMPTY(&asoc->out_wheel)) { 704 sctp_report_all_outbound(stcb); 705 } 706 /* stop the timer */ 707 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net); 708 /* send SHUTDOWN-COMPLETE */ 709 sctp_send_shutdown_complete(stcb, net); 710 /* notify upper layer protocol */ 711 if (stcb->sctp_socket) { 712 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL); 713 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 714 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 715 /* Set the connected flag to disconnected */ 716 stcb->sctp_ep->sctp_socket->so_snd.sb_cc = 0; 717 } 718 } 719 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 720 /* free the TCB but first save off the ep */ 721 sctp_free_assoc(stcb->sctp_ep, stcb, 0); 722} 723 724/* 725 * Skip past the param header and then we will find the chunk that caused the 726 * problem. There are two possiblities ASCONF or FWD-TSN other than that and 727 * our peer must be broken. 728 */ 729static void 730sctp_process_unrecog_chunk(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr, 731 struct sctp_nets *net) 732{ 733 struct sctp_chunkhdr *chk; 734 735 chk = (struct sctp_chunkhdr *)((caddr_t)phdr + sizeof(*phdr)); 736 switch (chk->chunk_type) { 737 case SCTP_ASCONF_ACK: 738 case SCTP_ASCONF: 739 sctp_asconf_cleanup(stcb, net); 740 break; 741 case SCTP_FORWARD_CUM_TSN: 742 stcb->asoc.peer_supports_prsctp = 0; 743 break; 744 default: 745#ifdef SCTP_DEBUG 746 if (sctp_debug_on & SCTP_DEBUG_INPUT2) { 747 printf("Peer does not support chunk type %d(%x)??\n", 748 chk->chunk_type, (uint32_t) chk->chunk_type); 749 } 750#endif 751 break; 752 } 753} 754 755/* 756 * Skip past the param header and then we will find the param that caused the 757 * problem. There are a number of param's in a ASCONF OR the prsctp param 758 * these will turn of specific features. 759 */ 760static void 761sctp_process_unrecog_param(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr) 762{ 763 struct sctp_paramhdr *pbad; 764 765 pbad = phdr + 1; 766 switch (ntohs(pbad->param_type)) { 767 /* pr-sctp draft */ 768 case SCTP_PRSCTP_SUPPORTED: 769 stcb->asoc.peer_supports_prsctp = 0; 770 break; 771 case SCTP_SUPPORTED_CHUNK_EXT: 772 break; 773 /* draft-ietf-tsvwg-addip-sctp */ 774 case SCTP_ECN_NONCE_SUPPORTED: 775 stcb->asoc.peer_supports_ecn_nonce = 0; 776 stcb->asoc.ecn_nonce_allowed = 0; 777 stcb->asoc.ecn_allowed = 0; 778 break; 779 case SCTP_ADD_IP_ADDRESS: 780 case SCTP_DEL_IP_ADDRESS: 781 case SCTP_SET_PRIM_ADDR: 782 stcb->asoc.peer_supports_asconf = 0; 783 break; 784 case SCTP_SUCCESS_REPORT: 785 case SCTP_ERROR_CAUSE_IND: 786#ifdef SCTP_DEBUG 787 if (sctp_debug_on & SCTP_DEBUG_INPUT2) { 788 printf("Huh, the peer does not support success? or error cause?\n"); 789 printf("Turning off ASCONF to this strange peer\n"); 790 } 791#endif 792 stcb->asoc.peer_supports_asconf = 0; 793 break; 794 default: 795#ifdef SCTP_DEBUG 796 if (sctp_debug_on & SCTP_DEBUG_INPUT2) { 797 printf("Peer does not support param type %d(%x)??\n", 798 pbad->param_type, (uint32_t) pbad->param_type); 799 } 800#endif 801 break; 802 } 803} 804 805static int 806sctp_handle_error(struct sctp_chunkhdr *ch, 807 struct sctp_tcb *stcb, struct sctp_nets *net) 808{ 809 int chklen; 810 struct sctp_paramhdr *phdr; 811 uint16_t error_type; 812 uint16_t error_len; 813 struct sctp_association *asoc; 814 815 int adjust; 816 817 /* parse through all of the errors and process */ 818 asoc = &stcb->asoc; 819 phdr = (struct sctp_paramhdr *)((caddr_t)ch + 820 sizeof(struct sctp_chunkhdr)); 821 chklen = ntohs(ch->chunk_length) - sizeof(struct sctp_chunkhdr); 822 while ((size_t)chklen >= sizeof(struct sctp_paramhdr)) { 823 /* Process an Error Cause */ 824 error_type = ntohs(phdr->param_type); 825 error_len = ntohs(phdr->param_length); 826 if ((error_len > chklen) || (error_len == 0)) { 827 /* invalid param length for this param */ 828#ifdef SCTP_DEBUG 829 if (sctp_debug_on & SCTP_DEBUG_INPUT1) { 830 printf("Bogus length in error param- chunk left:%d errorlen:%d\n", 831 chklen, error_len); 832 } 833#endif /* SCTP_DEBUG */ 834 return (0); 835 } 836 switch (error_type) { 837 case SCTP_CAUSE_INVALID_STREAM: 838 case SCTP_CAUSE_MISSING_PARAM: 839 case SCTP_CAUSE_INVALID_PARAM: 840 case SCTP_CAUSE_NO_USER_DATA: 841#ifdef SCTP_DEBUG 842 if (sctp_debug_on & SCTP_DEBUG_INPUT1) { 843 printf("Software error we got a %d back? We have a bug :/ (or do they?)\n", 844 error_type); 845 } 846#endif 847 break; 848 case SCTP_CAUSE_STALE_COOKIE: 849 /* 850 * We only act if we have echoed a cookie and are 851 * waiting. 852 */ 853 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) { 854 int *p; 855 856 p = (int *)((caddr_t)phdr + sizeof(*phdr)); 857 /* Save the time doubled */ 858 asoc->cookie_preserve_req = ntohl(*p) << 1; 859 asoc->stale_cookie_count++; 860 if (asoc->stale_cookie_count > 861 asoc->max_init_times) { 862 sctp_abort_notification(stcb, 0); 863 /* now free the asoc */ 864 sctp_free_assoc(stcb->sctp_ep, stcb, 0); 865 return (-1); 866 } 867 /* blast back to INIT state */ 868 asoc->state &= ~SCTP_STATE_COOKIE_ECHOED; 869 asoc->state |= SCTP_STATE_COOKIE_WAIT; 870 871 sctp_stop_all_cookie_timers(stcb); 872 sctp_send_initiate(stcb->sctp_ep, stcb); 873 } 874 break; 875 case SCTP_CAUSE_UNRESOLVABLE_ADDR: 876 /* 877 * Nothing we can do here, we don't do hostname 878 * addresses so if the peer does not like my IPv6 879 * (or IPv4 for that matter) it does not matter. If 880 * they don't support that type of address, they can 881 * NOT possibly get that packet type... i.e. with no 882 * IPv6 you can't recieve a IPv6 packet. so we can 883 * safely ignore this one. If we ever added support 884 * for HOSTNAME Addresses, then we would need to do 885 * something here. 886 */ 887 break; 888 case SCTP_CAUSE_UNRECOG_CHUNK: 889 sctp_process_unrecog_chunk(stcb, phdr, net); 890 break; 891 case SCTP_CAUSE_UNRECOG_PARAM: 892 sctp_process_unrecog_param(stcb, phdr); 893 break; 894 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN: 895 /* 896 * We ignore this since the timer will drive out a 897 * new cookie anyway and there timer will drive us 898 * to send a SHUTDOWN_COMPLETE. We can't send one 899 * here since we don't have their tag. 900 */ 901 break; 902 case SCTP_CAUSE_DELETING_LAST_ADDR: 903 case SCTP_CAUSE_RESOURCE_SHORTAGE: 904 case SCTP_CAUSE_DELETING_SRC_ADDR: 905 /* 906 * We should NOT get these here, but in a 907 * ASCONF-ACK. n 908 */ 909#ifdef SCTP_DEBUG 910 if (sctp_debug_on & SCTP_DEBUG_INPUT2) { 911 printf("Peer sends ASCONF errors in a Operational Error?<%d>?\n", 912 error_type); 913 } 914#endif 915 break; 916 case SCTP_CAUSE_OUT_OF_RESC: 917 /* 918 * And what, pray tell do we do with the fact that 919 * the peer is out of resources? Not really sure we 920 * could do anything but abort. I suspect this n * 921 * should have came WITH an abort instead of in a 922 * OP-ERROR. 923 */ 924 break; 925 default: 926#ifdef SCTP_DEBUG 927 if (sctp_debug_on & SCTP_DEBUG_INPUT1) { 928 /* don't know what this error cause is... */ 929 printf("sctp_handle_error: unknown error type = 0x%xh\n", 930 error_type); 931 } 932#endif /* SCTP_DEBUG */ 933 break; 934 } 935 adjust = SCTP_SIZE32(error_len); 936 chklen -= adjust; 937 phdr = (struct sctp_paramhdr *)((caddr_t)phdr + adjust); 938 } 939 return (0); 940} 941 942static int 943sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset, struct sctphdr *sh, 944 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 945 struct sctp_nets *net) 946{ 947 struct sctp_init_ack *init_ack; 948 int *state; 949 struct mbuf *op_err; 950 951#ifdef SCTP_DEBUG 952 if (sctp_debug_on & SCTP_DEBUG_INPUT2) { 953 printf("sctp_handle_init_ack: handling INIT-ACK\n"); 954 } 955#endif 956 if (stcb == NULL) { 957#ifdef SCTP_DEBUG 958 if (sctp_debug_on & SCTP_DEBUG_INPUT2) { 959 printf("sctp_handle_init_ack: TCB is null\n"); 960 } 961#endif 962 return (-1); 963 } 964 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) { 965 /* Invalid length */ 966 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 967 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 968 op_err); 969 return (-1); 970 } 971 init_ack = &cp->init; 972 /* validate parameters */ 973 if (init_ack->initiate_tag == 0) { 974 /* protocol error... send an abort */ 975 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 976 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 977 op_err); 978 return (-1); 979 } 980 if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) { 981 /* protocol error... send an abort */ 982 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 983 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 984 op_err); 985 return (-1); 986 } 987 if (init_ack->num_inbound_streams == 0) { 988 /* protocol error... send an abort */ 989 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 990 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 991 op_err); 992 return (-1); 993 } 994 if (init_ack->num_outbound_streams == 0) { 995 /* protocol error... send an abort */ 996 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 997 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 998 op_err); 999 return (-1); 1000 } 1001 /* process according to association state... */ 1002 state = &stcb->asoc.state; 1003 switch (*state & SCTP_STATE_MASK) { 1004 case SCTP_STATE_COOKIE_WAIT: 1005 /* this is the expected state for this chunk */ 1006 /* process the INIT-ACK parameters */ 1007 if (stcb->asoc.primary_destination->dest_state & 1008 SCTP_ADDR_UNCONFIRMED) { 1009 /* 1010 * The primary is where we sent the INIT, we can 1011 * always consider it confirmed when the INIT-ACK is 1012 * returned. Do this before we load addresses 1013 * though. 1014 */ 1015 stcb->asoc.primary_destination->dest_state &= 1016 ~SCTP_ADDR_UNCONFIRMED; 1017 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 1018 stcb, 0, (void *)stcb->asoc.primary_destination); 1019 } 1020 if (sctp_process_init_ack(m, iphlen, offset, sh, cp, stcb, net 1021 ) < 0) { 1022 /* error in parsing parameters */ 1023 return (-1); 1024 } 1025 /* update our state */ 1026#ifdef SCTP_DEBUG 1027 if (sctp_debug_on & SCTP_DEBUG_INPUT2) { 1028 printf("moving to COOKIE-ECHOED state\n"); 1029 } 1030#endif 1031 if (*state & SCTP_STATE_SHUTDOWN_PENDING) { 1032 *state = SCTP_STATE_COOKIE_ECHOED | 1033 SCTP_STATE_SHUTDOWN_PENDING; 1034 } else { 1035 *state = SCTP_STATE_COOKIE_ECHOED; 1036 } 1037 1038 /* reset the RTO calc */ 1039 stcb->asoc.overall_error_count = 0; 1040 SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 1041 /* 1042 * collapse the init timer back in case of a exponential 1043 * backoff n 1044 */ 1045 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep, 1046 stcb, net); 1047 /* 1048 * the send at the end of the inbound data processing will 1049 * cause the cookie to be sent 1050 */ 1051 break; 1052 case SCTP_STATE_SHUTDOWN_SENT: 1053 /* incorrect state... discard */ 1054 break; 1055 case SCTP_STATE_COOKIE_ECHOED: 1056 /* incorrect state... discard */ 1057 break; 1058 case SCTP_STATE_OPEN: 1059 /* incorrect state... discard */ 1060 break; 1061 case SCTP_STATE_EMPTY: 1062 case SCTP_STATE_INUSE: 1063 default: 1064 /* incorrect state... discard */ 1065 return (-1); 1066 break; 1067 } /* end switch asoc state */ 1068#ifdef SCTP_DEBUG 1069 if (sctp_debug_on & SCTP_DEBUG_INPUT1) { 1070 printf("Leaving handle-init-ack end\n"); 1071 } 1072#endif 1073 return (0); 1074} 1075 1076 1077/* 1078 * handle a state cookie for an existing association m: input packet mbuf 1079 * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a 1080 * "split" mbuf and the cookie signature does not exist offset: offset into 1081 * mbuf to the cookie-echo chunk 1082 */ 1083static struct sctp_tcb * 1084sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset, 1085 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1086 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets *net, 1087 struct sockaddr *init_src, int *notification, sctp_assoc_t * sac_assoc_id) 1088{ 1089 struct sctp_association *asoc; 1090 struct sctp_init_chunk *init_cp, init_buf; 1091 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1092 int chk_length; 1093 int init_offset, initack_offset; 1094 int retval; 1095 1096 /* I know that the TCB is non-NULL from the caller */ 1097 asoc = &stcb->asoc; 1098 1099 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 1100 /* SHUTDOWN came in after sending INIT-ACK */ 1101 struct mbuf *op_err; 1102 struct sctp_paramhdr *ph; 1103 1104 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination); 1105 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 1106 1, M_DONTWAIT, 1, MT_DATA); 1107 if (op_err == NULL) { 1108 /* FOOBAR */ 1109 return (NULL); 1110 } 1111 /* pre-reserve some space */ 1112 op_err->m_data += sizeof(struct ip6_hdr); 1113 op_err->m_data += sizeof(struct sctphdr); 1114 op_err->m_data += sizeof(struct sctp_chunkhdr); 1115 /* Set the len */ 1116 op_err->m_len = op_err->m_pkthdr.len = sizeof(struct sctp_paramhdr); 1117 ph = mtod(op_err, struct sctp_paramhdr *); 1118 ph->param_type = htons(SCTP_CAUSE_COOKIE_IN_SHUTDOWN); 1119 ph->param_length = htons(sizeof(struct sctp_paramhdr)); 1120 sctp_send_operr_to(m, iphlen, op_err, cookie->peers_vtag); 1121 return (NULL); 1122 } 1123 /* 1124 * find and validate the INIT chunk in the cookie (peer's info) the 1125 * INIT should start after the cookie-echo header struct (chunk 1126 * header, state cookie header struct) 1127 */ 1128 init_offset = offset += sizeof(struct sctp_cookie_echo_chunk); 1129 1130 init_cp = (struct sctp_init_chunk *) 1131 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 1132 (uint8_t *) & init_buf); 1133 if (init_cp == NULL) { 1134 /* could not pull a INIT chunk in cookie */ 1135 return (NULL); 1136 } 1137 chk_length = ntohs(init_cp->ch.chunk_length); 1138 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 1139 return (NULL); 1140 } 1141 /* 1142 * find and validate the INIT-ACK chunk in the cookie (my info) the 1143 * INIT-ACK follows the INIT chunk 1144 */ 1145 initack_offset = init_offset + SCTP_SIZE32(chk_length); 1146 initack_cp = (struct sctp_init_ack_chunk *) 1147 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 1148 (uint8_t *) & initack_buf); 1149 if (initack_cp == NULL) { 1150 /* could not pull INIT-ACK chunk in cookie */ 1151 return (NULL); 1152 } 1153 chk_length = ntohs(initack_cp->ch.chunk_length); 1154 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 1155 return (NULL); 1156 } 1157 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1158 (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) { 1159 /* 1160 * case D in Section 5.2.4 Table 2: MMAA process accordingly 1161 * to get into the OPEN state 1162 */ 1163 switch SCTP_GET_STATE 1164 (asoc) { 1165 case SCTP_STATE_COOKIE_WAIT: 1166 /* 1167 * INIT was sent, but got got a COOKIE_ECHO with the 1168 * correct tags... just accept it... 1169 */ 1170 /* First we must process the INIT !! */ 1171 retval = sctp_process_init(init_cp, stcb, net); 1172 if (retval < 0) { 1173 return (NULL); 1174 } 1175 /* intentional fall through to below... */ 1176 1177 case SCTP_STATE_COOKIE_ECHOED: 1178 /* Duplicate INIT case */ 1179 /* we have already processed the INIT so no problem */ 1180 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, 1181 net); 1182 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net); 1183 sctp_stop_all_cookie_timers(stcb); 1184 /* update current state */ 1185 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1186 asoc->state = SCTP_STATE_OPEN | 1187 SCTP_STATE_SHUTDOWN_PENDING; 1188 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1189 stcb->sctp_ep, stcb, asoc->primary_destination); 1190 1191 } else if ((asoc->state & SCTP_STATE_SHUTDOWN_SENT) == 0) { 1192 /* if ok, move to OPEN state */ 1193 asoc->state = SCTP_STATE_OPEN; 1194 } 1195 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1196 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1197 (inp->sctp_socket->so_qlimit == 0) 1198 ) { 1199 /* 1200 * Here is where collision would go if we 1201 * did a connect() and instead got a 1202 * init/init-ack/cookie done before the 1203 * init-ack came back.. 1204 */ 1205 stcb->sctp_ep->sctp_flags |= 1206 SCTP_PCB_FLAGS_CONNECTED; 1207 soisconnected(stcb->sctp_ep->sctp_socket); 1208 } 1209 /* notify upper layer */ 1210 *notification = SCTP_NOTIFY_ASSOC_UP; 1211 /* 1212 * since we did not send a HB make sure we don't 1213 * double things 1214 */ 1215 net->hb_responded = 1; 1216 1217 if (stcb->asoc.sctp_autoclose_ticks && 1218 (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) { 1219 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 1220 inp, stcb, NULL); 1221 } 1222 break; 1223 default: 1224 /* 1225 * we're in the OPEN state (or beyond), so peer must 1226 * have simply lost the COOKIE-ACK 1227 */ 1228 break; 1229 } /* end switch */ 1230 1231 /* 1232 * We ignore the return code here.. not sure if we should 1233 * somehow abort.. but we do have an existing asoc. This 1234 * really should not fail. 1235 */ 1236 if (sctp_load_addresses_from_init(stcb, m, iphlen, 1237 init_offset + sizeof(struct sctp_init_chunk), 1238 initack_offset, sh, init_src)) { 1239 return (NULL); 1240 } 1241 /* respond with a COOKIE-ACK */ 1242 sctp_send_cookie_ack(stcb); 1243 return (stcb); 1244 } /* end if */ 1245 if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1246 ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag && 1247 cookie->tie_tag_my_vtag == 0 && 1248 cookie->tie_tag_peer_vtag == 0) { 1249 /* 1250 * case C in Section 5.2.4 Table 2: XMOO silently discard 1251 */ 1252 return (NULL); 1253 } 1254 if (ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag && 1255 (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag || 1256 init_cp->init.initiate_tag == 0)) { 1257 /* 1258 * case B in Section 5.2.4 Table 2: MXAA or MOAA my info 1259 * should be ok, re-accept peer info 1260 */ 1261 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net); 1262 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net); 1263 sctp_stop_all_cookie_timers(stcb); 1264 /* 1265 * since we did not send a HB make sure we don't double 1266 * things 1267 */ 1268 net->hb_responded = 1; 1269 if (stcb->asoc.sctp_autoclose_ticks && 1270 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 1271 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, 1272 NULL); 1273 } 1274 /* 1275 * FIX? Should we go out, in this case (if the seq numbers 1276 * changed on the peer) and set any data to RETRANSMIT? 1277 */ 1278 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1279 asoc->pre_open_streams = 1280 ntohs(initack_cp->init.num_outbound_streams); 1281 asoc->last_cwr_tsn = asoc->init_seq_number - 1; 1282 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 1283 asoc->str_reset_seq_in = asoc->init_seq_number; 1284 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 1285 1286 /* process the INIT info (peer's info) */ 1287 retval = sctp_process_init(init_cp, stcb, net); 1288 if (retval < 0) { 1289 return (NULL); 1290 } 1291 if (sctp_load_addresses_from_init(stcb, m, iphlen, 1292 init_offset + sizeof(struct sctp_init_chunk), 1293 initack_offset, sh, init_src)) { 1294 return (NULL); 1295 } 1296 if ((asoc->state & SCTP_STATE_COOKIE_WAIT) || 1297 (asoc->state & SCTP_STATE_COOKIE_ECHOED)) { 1298 *notification = SCTP_NOTIFY_ASSOC_UP; 1299 1300 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1301 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1302 (inp->sctp_socket->so_qlimit == 0)) { 1303 stcb->sctp_ep->sctp_flags |= 1304 SCTP_PCB_FLAGS_CONNECTED; 1305 soisconnected(stcb->sctp_ep->sctp_socket); 1306 } 1307 } 1308 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1309 asoc->state = SCTP_STATE_OPEN | 1310 SCTP_STATE_SHUTDOWN_PENDING; 1311 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1312 stcb->sctp_ep, stcb, asoc->primary_destination); 1313 1314 } else { 1315 asoc->state = SCTP_STATE_OPEN; 1316 } 1317 sctp_stop_all_cookie_timers(stcb); 1318 sctp_send_cookie_ack(stcb); 1319 return (stcb); 1320 } 1321 if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1322 ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) && 1323 cookie->tie_tag_my_vtag == asoc->my_vtag_nonce && 1324 cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce && 1325 cookie->tie_tag_peer_vtag != 0) { 1326 struct sctpasochead *head; 1327 1328 /* 1329 * case A in Section 5.2.4 Table 2: XXMM (peer restarted) 1330 */ 1331 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net); 1332 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net); 1333 *sac_assoc_id = sctp_get_associd(stcb); 1334 /* notify upper layer */ 1335 *notification = SCTP_NOTIFY_ASSOC_RESTART; 1336 1337 1338 /* send up all the data */ 1339 sctp_report_all_outbound(stcb); 1340 1341 /* process the INIT-ACK info (my info) */ 1342 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 1343 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1344 1345 /* pull from vtag hash */ 1346 LIST_REMOVE(stcb, sctp_asocs); 1347 /* re-insert to new vtag position */ 1348 head = &sctppcbinfo.sctp_asochash[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, 1349 sctppcbinfo.hashasocmark)]; 1350 /* 1351 * put it in the bucket in the vtag hash of assoc's for the 1352 * system 1353 */ 1354 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 1355 1356 /* Is this the first restart? */ 1357 if (stcb->asoc.in_restart_hash == 0) { 1358 /* Ok add it to assoc_id vtag hash */ 1359 head = &sctppcbinfo.sctp_restarthash[SCTP_PCBHASH_ASOC(stcb->asoc.assoc_id, 1360 sctppcbinfo.hashrestartmark)]; 1361 LIST_INSERT_HEAD(head, stcb, sctp_tcbrestarhash); 1362 stcb->asoc.in_restart_hash = 1; 1363 } 1364 asoc->pre_open_streams = 1365 ntohs(initack_cp->init.num_outbound_streams); 1366 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 1367 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 1368 1369 asoc->last_cwr_tsn = asoc->init_seq_number - 1; 1370 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 1371 1372 asoc->str_reset_seq_in = asoc->init_seq_number; 1373 1374 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 1375 if (asoc->mapping_array) 1376 memset(asoc->mapping_array, 0, 1377 asoc->mapping_array_size); 1378 /* process the INIT info (peer's info) */ 1379 retval = sctp_process_init(init_cp, stcb, net); 1380 if (retval < 0) { 1381 return (NULL); 1382 } 1383 /* 1384 * since we did not send a HB make sure we don't double 1385 * things 1386 */ 1387 net->hb_responded = 1; 1388 1389 if (sctp_load_addresses_from_init(stcb, m, iphlen, 1390 init_offset + sizeof(struct sctp_init_chunk), 1391 initack_offset, sh, init_src)) { 1392 return (NULL); 1393 } 1394 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1395 asoc->state = SCTP_STATE_OPEN | 1396 SCTP_STATE_SHUTDOWN_PENDING; 1397 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1398 stcb->sctp_ep, stcb, asoc->primary_destination); 1399 1400 } else if (!(asoc->state & SCTP_STATE_SHUTDOWN_SENT)) { 1401 /* move to OPEN state, if not in SHUTDOWN_SENT */ 1402 asoc->state = SCTP_STATE_OPEN; 1403 } 1404 /* respond with a COOKIE-ACK */ 1405 sctp_stop_all_cookie_timers(stcb); 1406 sctp_send_cookie_ack(stcb); 1407 1408 return (stcb); 1409 } 1410 /* if we are not a restart we need the assoc_id field pop'd */ 1411 asoc->assoc_id = ntohl(initack_cp->init.initiate_tag); 1412 1413 /* all other cases... */ 1414 return (NULL); 1415} 1416 1417/* 1418 * handle a state cookie for a new association m: input packet mbuf chain-- 1419 * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf 1420 * and the cookie signature does not exist offset: offset into mbuf to the 1421 * cookie-echo chunk length: length of the cookie chunk to: where the init 1422 * was from returns a new TCB 1423 */ 1424static struct sctp_tcb * 1425sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1426 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1427 struct sctp_inpcb *inp, struct sctp_nets **netp, 1428 struct sockaddr *init_src, int *notification, 1429 int auth_skipped, uint32_t auth_offset, uint32_t auth_len) 1430{ 1431 struct sctp_tcb *stcb; 1432 struct sctp_init_chunk *init_cp, init_buf; 1433 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1434 struct sockaddr_storage sa_store; 1435 struct sockaddr *initack_src = (struct sockaddr *)&sa_store; 1436 struct sockaddr_in *sin; 1437 struct sockaddr_in6 *sin6; 1438 struct sctp_association *asoc; 1439 int chk_length; 1440 int init_offset, initack_offset, initack_limit; 1441 int retval; 1442 int error = 0; 1443 uint32_t old_tag; 1444 uint8_t chunk_buf[DEFAULT_CHUNK_BUFFER]; 1445 1446 /* 1447 * find and validate the INIT chunk in the cookie (peer's info) the 1448 * INIT should start after the cookie-echo header struct (chunk 1449 * header, state cookie header struct) 1450 */ 1451 init_offset = offset + sizeof(struct sctp_cookie_echo_chunk); 1452 init_cp = (struct sctp_init_chunk *) 1453 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 1454 (uint8_t *) & init_buf); 1455 if (init_cp == NULL) { 1456 /* could not pull a INIT chunk in cookie */ 1457#ifdef SCTP_DEBUG 1458 if (sctp_debug_on & SCTP_DEBUG_INPUT1) { 1459 printf("process_cookie_new: could not pull INIT chunk hdr\n"); 1460 } 1461#endif /* SCTP_DEBUG */ 1462 return (NULL); 1463 } 1464 chk_length = ntohs(init_cp->ch.chunk_length); 1465 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 1466#ifdef SCTP_DEBUG 1467 if (sctp_debug_on & SCTP_DEBUG_INPUT1) { 1468 printf("HUH? process_cookie_new: could not find INIT chunk!\n"); 1469 } 1470#endif /* SCTP_DEBUG */ 1471 return (NULL); 1472 } 1473 initack_offset = init_offset + SCTP_SIZE32(chk_length); 1474 /* 1475 * find and validate the INIT-ACK chunk in the cookie (my info) the 1476 * INIT-ACK follows the INIT chunk 1477 */ 1478 initack_cp = (struct sctp_init_ack_chunk *) 1479 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 1480 (uint8_t *) & initack_buf); 1481 if (initack_cp == NULL) { 1482 /* could not pull INIT-ACK chunk in cookie */ 1483#ifdef SCTP_DEBUG 1484 if (sctp_debug_on & SCTP_DEBUG_INPUT1) { 1485 printf("process_cookie_new: could not pull INIT-ACK chunk hdr\n"); 1486 } 1487#endif /* SCTP_DEBUG */ 1488 return (NULL); 1489 } 1490 chk_length = ntohs(initack_cp->ch.chunk_length); 1491 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 1492 return (NULL); 1493 } 1494 /* 1495 * NOTE: We can't use the INIT_ACK's chk_length to determine the 1496 * "initack_limit" value. This is because the chk_length field 1497 * includes the length of the cookie, but the cookie is omitted when 1498 * the INIT and INIT_ACK are tacked onto the cookie... 1499 */ 1500 initack_limit = offset + cookie_len; 1501 1502 /* 1503 * now that we know the INIT/INIT-ACK are in place, create a new TCB 1504 * and popluate 1505 */ 1506 stcb = sctp_aloc_assoc(inp, init_src, 0, &error, 1507 ntohl(initack_cp->init.initiate_tag)); 1508 if (stcb == NULL) { 1509 struct mbuf *op_err; 1510 1511 /* memory problem? */ 1512#ifdef SCTP_DEBUG 1513 if (sctp_debug_on & SCTP_DEBUG_INPUT1) { 1514 printf("process_cookie_new: no room for another TCB!\n"); 1515 } 1516#endif /* SCTP_DEBUG */ 1517 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC); 1518 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 1519 sh, op_err); 1520 return (NULL); 1521 } 1522 /* get the correct sctp_nets */ 1523 *netp = sctp_findnet(stcb, init_src); 1524 asoc = &stcb->asoc; 1525 /* get scope variables out of cookie */ 1526 asoc->ipv4_local_scope = cookie->ipv4_scope; 1527 asoc->site_scope = cookie->site_scope; 1528 asoc->local_scope = cookie->local_scope; 1529 asoc->loopback_scope = cookie->loopback_scope; 1530 1531 if ((asoc->ipv4_addr_legal != cookie->ipv4_addr_legal) || 1532 (asoc->ipv6_addr_legal != cookie->ipv6_addr_legal)) { 1533 struct mbuf *op_err; 1534 1535 /* 1536 * Houston we have a problem. The EP changed while the 1537 * cookie was in flight. Only recourse is to abort the 1538 * association. 1539 */ 1540 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC); 1541 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 1542 sh, op_err); 1543 return (NULL); 1544 } 1545 /* process the INIT-ACK info (my info) */ 1546 old_tag = asoc->my_vtag; 1547 asoc->assoc_id = asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 1548 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1549 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 1550 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 1551 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 1552 asoc->last_cwr_tsn = asoc->init_seq_number - 1; 1553 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 1554 asoc->str_reset_seq_in = asoc->init_seq_number; 1555 1556 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 1557 1558 /* process the INIT info (peer's info) */ 1559 retval = sctp_process_init(init_cp, stcb, *netp); 1560 if (retval < 0) { 1561 sctp_free_assoc(inp, stcb, 0); 1562 return (NULL); 1563 } 1564 /* load all addresses */ 1565 if (sctp_load_addresses_from_init(stcb, m, iphlen, 1566 init_offset + sizeof(struct sctp_init_chunk), initack_offset, sh, 1567 init_src)) { 1568 sctp_free_assoc(inp, stcb, 0); 1569 return (NULL); 1570 } 1571 /* 1572 * verify any preceding AUTH chunk that was skipped 1573 */ 1574 /* pull the local authentication parameters from the cookie/init-ack */ 1575 sctp_auth_get_cookie_params(stcb, m, 1576 initack_offset + sizeof(struct sctp_init_ack_chunk), 1577 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk))); 1578 if (auth_skipped) { 1579 struct sctp_auth_chunk *auth; 1580 1581 auth = (struct sctp_auth_chunk *) 1582 sctp_m_getptr(m, auth_offset, auth_len, chunk_buf); 1583 if (sctp_handle_auth(stcb, auth, m, auth_offset)) { 1584 /* auth HMAC failed, dump the assoc and packet */ 1585#ifdef SCTP_DEBUG 1586 if (sctp_debug_on & SCTP_DEBUG_AUTH1) 1587 printf("COOKIE-ECHO: AUTH failed\n"); 1588#endif /* SCTP_DEBUG */ 1589 sctp_free_assoc(inp, stcb, 0); 1590 return (NULL); 1591 } else { 1592 /* remaining chunks checked... good to go */ 1593 stcb->asoc.authenticated = 1; 1594 } 1595 } 1596 /* update current state */ 1597#ifdef SCTP_DEBUG 1598 if (sctp_debug_on & SCTP_DEBUG_INPUT1) { 1599 printf("moving to OPEN state\n"); 1600 } 1601#endif 1602 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1603 asoc->state = SCTP_STATE_OPEN | SCTP_STATE_SHUTDOWN_PENDING; 1604 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1605 stcb->sctp_ep, stcb, asoc->primary_destination); 1606 } else { 1607 asoc->state = SCTP_STATE_OPEN; 1608 } 1609 SCTP_STAT_INCR_COUNTER32(sctps_passiveestab); 1610 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1611 sctp_stop_all_cookie_timers(stcb); 1612 /* calculate the RTT */ 1613 (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp, 1614 &cookie->time_entered); 1615 1616 /* 1617 * if we're doing ASCONFs, check to see if we have any new local 1618 * addresses that need to get added to the peer (eg. addresses 1619 * changed while cookie echo in flight). This needs to be done 1620 * after we go to the OPEN state to do the correct asconf 1621 * processing. else, make sure we have the correct addresses in our 1622 * lists 1623 */ 1624 1625 /* warning, we re-use sin, sin6, sa_store here! */ 1626 /* pull in local_address (our "from" address) */ 1627 if (cookie->laddr_type == SCTP_IPV4_ADDRESS) { 1628 /* source addr is IPv4 */ 1629 sin = (struct sockaddr_in *)initack_src; 1630 memset(sin, 0, sizeof(*sin)); 1631 sin->sin_family = AF_INET; 1632 sin->sin_len = sizeof(struct sockaddr_in); 1633 sin->sin_addr.s_addr = cookie->laddress[0]; 1634 } else if (cookie->laddr_type == SCTP_IPV6_ADDRESS) { 1635 /* source addr is IPv6 */ 1636 sin6 = (struct sockaddr_in6 *)initack_src; 1637 memset(sin6, 0, sizeof(*sin6)); 1638 sin6->sin6_family = AF_INET6; 1639 sin6->sin6_len = sizeof(struct sockaddr_in6); 1640 sin6->sin6_scope_id = cookie->scope_id; 1641 memcpy(&sin6->sin6_addr, cookie->laddress, 1642 sizeof(sin6->sin6_addr)); 1643 } else { 1644 sctp_free_assoc(inp, stcb, 0); 1645 return (NULL); 1646 } 1647 1648 sctp_check_address_list(stcb, m, 1649 initack_offset + sizeof(struct sctp_init_ack_chunk), 1650 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)), 1651 initack_src, cookie->local_scope, cookie->site_scope, 1652 cookie->ipv4_scope, cookie->loopback_scope); 1653 1654 1655 /* set up to notify upper layer */ 1656 *notification = SCTP_NOTIFY_ASSOC_UP; 1657 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1658 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1659 (inp->sctp_socket->so_qlimit == 0)) { 1660 /* 1661 * This is an endpoint that called connect() how it got a 1662 * cookie that is NEW is a bit of a mystery. It must be that 1663 * the INIT was sent, but before it got there.. a complete 1664 * INIT/INIT-ACK/COOKIE arrived. But of course then it 1665 * should have went to the other code.. not here.. oh well.. 1666 * a bit of protection is worth having.. 1667 */ 1668 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 1669 soisconnected(stcb->sctp_ep->sctp_socket); 1670 } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 1671 (inp->sctp_socket->so_qlimit)) { 1672 /* 1673 * We don't want to do anything with this one. Since it is 1674 * the listening guy. The timer will get started for 1675 * accepted connections in the caller. 1676 */ 1677 ; 1678 } 1679 /* since we did not send a HB make sure we don't double things */ 1680 (*netp)->hb_responded = 1; 1681 1682 if (stcb->asoc.sctp_autoclose_ticks && 1683 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 1684 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL); 1685 } 1686 /* respond with a COOKIE-ACK */ 1687 sctp_send_cookie_ack(stcb); 1688 return (stcb); 1689} 1690 1691 1692/* 1693 * handles a COOKIE-ECHO message stcb: modified to either a new or left as 1694 * existing (non-NULL) TCB 1695 */ 1696static struct mbuf * 1697sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset, 1698 struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp, 1699 struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp, 1700 int auth_skipped, uint32_t auth_offset, uint32_t auth_len) 1701{ 1702 struct sctp_state_cookie *cookie; 1703 struct sockaddr_in6 sin6; 1704 struct sockaddr_in sin; 1705 struct sctp_tcb *l_stcb = *stcb; 1706 struct sctp_inpcb *l_inp; 1707 struct sockaddr *to; 1708 sctp_assoc_t sac_restart_id; 1709 struct sctp_pcb *ep; 1710 struct mbuf *m_sig; 1711 uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE]; 1712 uint8_t *sig; 1713 uint8_t cookie_ok = 0; 1714 unsigned int size_of_pkt, sig_offset, cookie_offset; 1715 unsigned int cookie_len; 1716 struct timeval now; 1717 struct timeval time_expires; 1718 struct sockaddr_storage dest_store; 1719 struct sockaddr *localep_sa = (struct sockaddr *)&dest_store; 1720 struct ip *iph; 1721 int notification = 0; 1722 struct sctp_nets *netl; 1723 int had_a_existing_tcb = 0; 1724 1725#ifdef SCTP_DEBUG 1726 if (sctp_debug_on & SCTP_DEBUG_INPUT2) { 1727 printf("sctp_handle_cookie: handling COOKIE-ECHO\n"); 1728 } 1729#endif 1730 1731 if (inp_p == NULL) { 1732 return (NULL); 1733 } 1734 /* First get the destination address setup too. */ 1735 iph = mtod(m, struct ip *); 1736 if (iph->ip_v == IPVERSION) { 1737 /* its IPv4 */ 1738 struct sockaddr_in *sin; 1739 1740 sin = (struct sockaddr_in *)(localep_sa); 1741 memset(sin, 0, sizeof(*sin)); 1742 sin->sin_family = AF_INET; 1743 sin->sin_len = sizeof(*sin); 1744 sin->sin_port = sh->dest_port; 1745 sin->sin_addr.s_addr = iph->ip_dst.s_addr; 1746 } else if (iph->ip_v == (IPV6_VERSION >> 4)) { 1747 /* its IPv6 */ 1748 struct ip6_hdr *ip6; 1749 struct sockaddr_in6 *sin6; 1750 1751 sin6 = (struct sockaddr_in6 *)(localep_sa); 1752 memset(sin6, 0, sizeof(*sin6)); 1753 sin6->sin6_family = AF_INET6; 1754 sin6->sin6_len = sizeof(struct sockaddr_in6); 1755 ip6 = mtod(m, struct ip6_hdr *); 1756 sin6->sin6_port = sh->dest_port; 1757 sin6->sin6_addr = ip6->ip6_dst; 1758 } else { 1759 return (NULL); 1760 } 1761 1762 cookie = &cp->cookie; 1763 cookie_offset = offset + sizeof(struct sctp_chunkhdr); 1764 cookie_len = ntohs(cp->ch.chunk_length); 1765 1766 if ((cookie->peerport != sh->src_port) && 1767 (cookie->myport != sh->dest_port) && 1768 (cookie->my_vtag != sh->v_tag)) { 1769 /* 1770 * invalid ports or bad tag. Note that we always leave the 1771 * v_tag in the header in network order and when we stored 1772 * it in the my_vtag slot we also left it in network order. 1773 * This maintians the match even though it may be in the 1774 * opposite byte order of the machine :-> 1775 */ 1776 return (NULL); 1777 } 1778 /* compute size of packet */ 1779 if (m->m_flags & M_PKTHDR) { 1780 size_of_pkt = m->m_pkthdr.len; 1781 } else { 1782 /* Should have a pkt hdr really */ 1783 struct mbuf *mat; 1784 1785 mat = m; 1786 size_of_pkt = 0; 1787 while (mat != NULL) { 1788 size_of_pkt += mat->m_len; 1789 mat = mat->m_next; 1790 } 1791 } 1792 if (cookie_len > size_of_pkt || 1793 cookie_len < sizeof(struct sctp_cookie_echo_chunk) + 1794 sizeof(struct sctp_init_chunk) + 1795 sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) { 1796 /* cookie too long! or too small */ 1797 return (NULL); 1798 } 1799 /* 1800 * split off the signature into its own mbuf (since it should not be 1801 * calculated in the sctp_hmac_m() call). 1802 */ 1803 sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE; 1804 if (sig_offset > size_of_pkt) { 1805 /* packet not correct size! */ 1806 /* XXX this may already be accounted for earlier... */ 1807 return (NULL); 1808 } 1809 m_sig = m_split(m, sig_offset, M_DONTWAIT); 1810 if (m_sig == NULL) { 1811 /* out of memory or ?? */ 1812 return (NULL); 1813 } 1814 /* 1815 * compute the signature/digest for the cookie 1816 */ 1817 ep = &(*inp_p)->sctp_ep; 1818 l_inp = *inp_p; 1819 if (l_stcb) { 1820 SCTP_TCB_UNLOCK(l_stcb); 1821 } 1822 SCTP_INP_RLOCK(l_inp); 1823 if (l_stcb) { 1824 SCTP_TCB_LOCK(l_stcb); 1825 } 1826 /* which cookie is it? */ 1827 if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) && 1828 (ep->current_secret_number != ep->last_secret_number)) { 1829 /* it's the old cookie */ 1830 sctp_hmac_m(SCTP_HMAC, 1831 (uint8_t *) ep->secret_key[(int)ep->last_secret_number], 1832 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig); 1833 } else { 1834 /* it's the current cookie */ 1835 sctp_hmac_m(SCTP_HMAC, 1836 (uint8_t *) ep->secret_key[(int)ep->current_secret_number], 1837 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig); 1838 } 1839 /* get the signature */ 1840 SCTP_INP_RUNLOCK(l_inp); 1841 sig = (uint8_t *) sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *) & tmp_sig); 1842 if (sig == NULL) { 1843 /* couldn't find signature */ 1844 sctp_m_freem(m_sig); 1845 return (NULL); 1846 } 1847 /* compare the received digest with the computed digest */ 1848 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) { 1849 /* try the old cookie? */ 1850 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) && 1851 (ep->current_secret_number != ep->last_secret_number)) { 1852 /* compute digest with old */ 1853 sctp_hmac_m(SCTP_HMAC, 1854 (uint8_t *) ep->secret_key[(int)ep->last_secret_number], 1855 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig); 1856 /* compare */ 1857 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0) 1858 cookie_ok = 1; 1859 } 1860 } else { 1861 cookie_ok = 1; 1862 } 1863 1864 /* 1865 * Now before we continue we must reconstruct our mbuf so that 1866 * normal processing of any other chunks will work. 1867 */ 1868 { 1869 struct mbuf *m_at; 1870 1871 m_at = m; 1872 while (m_at->m_next != NULL) { 1873 m_at = m_at->m_next; 1874 } 1875 m_at->m_next = m_sig; 1876 if (m->m_flags & M_PKTHDR) { 1877 /* 1878 * We should only do this if and only if the front 1879 * mbuf has a m_pkthdr... it should in theory. 1880 */ 1881 if (m_sig->m_flags & M_PKTHDR) { 1882 /* Add back to the pkt hdr of main m chain */ 1883 m->m_pkthdr.len += m_sig->m_pkthdr.len; 1884 } else { 1885 /* 1886 * Got a problem, no pkthdr in split chain. 1887 * TSNH but we will handle it just in case 1888 */ 1889 int mmlen = 0; 1890 struct mbuf *lat; 1891 1892 printf("Warning: Hitting m_split join TSNH code - fixed\n"); 1893 lat = m_sig; 1894 while (lat) { 1895 mmlen += lat->m_len; 1896 lat = lat->m_next; 1897 } 1898 m->m_pkthdr.len += mmlen; 1899 } 1900 } 1901 } 1902 1903 if (cookie_ok == 0) { 1904#ifdef SCTP_DEBUG 1905 if (sctp_debug_on & SCTP_DEBUG_INPUT2) { 1906 printf("handle_cookie_echo: cookie signature validation failed!\n"); 1907 printf("offset = %u, cookie_offset = %u, sig_offset = %u\n", 1908 (uint32_t) offset, cookie_offset, sig_offset); 1909 } 1910#endif 1911 return (NULL); 1912 } 1913 /* 1914 * check the cookie timestamps to be sure it's not stale 1915 */ 1916 SCTP_GETTIME_TIMEVAL(&now); 1917 /* Expire time is in Ticks, so we convert to seconds */ 1918 time_expires.tv_sec = cookie->time_entered.tv_sec + cookie->cookie_life; 1919 time_expires.tv_usec = cookie->time_entered.tv_usec; 1920 if (timevalcmp(&now, &time_expires, >)) { 1921 /* cookie is stale! */ 1922 struct mbuf *op_err; 1923 struct sctp_stale_cookie_msg *scm; 1924 uint32_t tim; 1925 1926 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_stale_cookie_msg), 1927 1, M_DONTWAIT, 1, MT_DATA); 1928 if (op_err == NULL) { 1929 /* FOOBAR */ 1930 return (NULL); 1931 } 1932 /* pre-reserve some space */ 1933 op_err->m_data += sizeof(struct ip6_hdr); 1934 op_err->m_data += sizeof(struct sctphdr); 1935 op_err->m_data += sizeof(struct sctp_chunkhdr); 1936 1937 /* Set the len */ 1938 op_err->m_len = op_err->m_pkthdr.len = sizeof(struct sctp_stale_cookie_msg); 1939 scm = mtod(op_err, struct sctp_stale_cookie_msg *); 1940 scm->ph.param_type = htons(SCTP_CAUSE_STALE_COOKIE); 1941 scm->ph.param_length = htons((sizeof(struct sctp_paramhdr) + 1942 (sizeof(uint32_t)))); 1943 /* seconds to usec */ 1944 tim = (now.tv_sec - time_expires.tv_sec) * 1000000; 1945 /* add in usec */ 1946 if (tim == 0) 1947 tim = now.tv_usec - cookie->time_entered.tv_usec; 1948 scm->time_usec = htonl(tim); 1949 sctp_send_operr_to(m, iphlen, op_err, cookie->peers_vtag); 1950 return (NULL); 1951 } 1952 /* 1953 * Now we must see with the lookup address if we have an existing 1954 * asoc. This will only happen if we were in the COOKIE-WAIT state 1955 * and a INIT collided with us and somewhere the peer sent the 1956 * cookie on another address besides the single address our assoc 1957 * had for him. In this case we will have one of the tie-tags set at 1958 * least AND the address field in the cookie can be used to look it 1959 * up. 1960 */ 1961 to = NULL; 1962 if (cookie->addr_type == SCTP_IPV6_ADDRESS) { 1963 memset(&sin6, 0, sizeof(sin6)); 1964 sin6.sin6_family = AF_INET6; 1965 sin6.sin6_len = sizeof(sin6); 1966 sin6.sin6_port = sh->src_port; 1967 sin6.sin6_scope_id = cookie->scope_id; 1968 memcpy(&sin6.sin6_addr.s6_addr, cookie->address, 1969 sizeof(sin6.sin6_addr.s6_addr)); 1970 to = (struct sockaddr *)&sin6; 1971 } else if (cookie->addr_type == SCTP_IPV4_ADDRESS) { 1972 memset(&sin, 0, sizeof(sin)); 1973 sin.sin_family = AF_INET; 1974 sin.sin_len = sizeof(sin); 1975 sin.sin_port = sh->src_port; 1976 sin.sin_addr.s_addr = cookie->address[0]; 1977 to = (struct sockaddr *)&sin; 1978 } 1979 if ((*stcb == NULL) && to) { 1980 /* Yep, lets check */ 1981 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, localep_sa, NULL); 1982 if (*stcb == NULL) { 1983 /* 1984 * We should have only got back the same inp. If we 1985 * got back a different ep we have a problem. The 1986 * original findep got back l_inp and now 1987 */ 1988 if (l_inp != *inp_p) { 1989 printf("Bad problem find_ep got a diff inp then special_locate?\n"); 1990 } 1991 } 1992 } 1993 cookie_len -= SCTP_SIGNATURE_SIZE; 1994 if (*stcb == NULL) { 1995 /* this is the "normal" case... get a new TCB */ 1996 *stcb = sctp_process_cookie_new(m, iphlen, offset, sh, cookie, 1997 cookie_len, *inp_p, netp, to, ¬ification, 1998 auth_skipped, auth_offset, auth_len); 1999 } else { 2000 /* this is abnormal... cookie-echo on existing TCB */ 2001 had_a_existing_tcb = 1; 2002 *stcb = sctp_process_cookie_existing(m, iphlen, offset, sh, 2003 cookie, cookie_len, *inp_p, *stcb, *netp, to, ¬ification, 2004 &sac_restart_id); 2005 } 2006 2007 if (*stcb == NULL) { 2008 /* still no TCB... must be bad cookie-echo */ 2009 return (NULL); 2010 } 2011 /* 2012 * Ok, we built an association so confirm the address we sent the 2013 * INIT-ACK to. 2014 */ 2015 netl = sctp_findnet(*stcb, to); 2016 /* 2017 * This code should in theory NOT run but 2018 */ 2019 if (netl == NULL) { 2020 /* TSNH! Huh, why do I need to add this address here? */ 2021 int ret; 2022 2023 ret = sctp_add_remote_addr(*stcb, to, 0, 100); 2024 netl = sctp_findnet(*stcb, to); 2025 } 2026 if (netl) { 2027 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) { 2028 netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 2029 sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL, 2030 netl); 2031 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2032 (*stcb), 0, (void *)netl); 2033 } 2034 } 2035 if (*stcb) { 2036 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, *inp_p, 2037 *stcb, NULL); 2038 } 2039 if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) { 2040 if (!had_a_existing_tcb || 2041 (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) { 2042 /* 2043 * If we have a NEW cookie or the connect never 2044 * reached the connected state during collision we 2045 * must do the TCP accept thing. 2046 */ 2047 struct socket *so, *oso; 2048 struct sctp_inpcb *inp; 2049 2050 if (notification == SCTP_NOTIFY_ASSOC_RESTART) { 2051 /* 2052 * For a restart we will keep the same 2053 * socket, no need to do anything. I THINK!! 2054 */ 2055 sctp_ulp_notify(notification, *stcb, 0, (void *)&sac_restart_id); 2056 return (m); 2057 } 2058 oso = (*inp_p)->sctp_socket; 2059 /* 2060 * We do this to keep the sockets side happy durin 2061 * the sonewcon ONLY. 2062 */ 2063 NET_LOCK_GIANT(); 2064 SCTP_TCB_UNLOCK((*stcb)); 2065 so = sonewconn(oso, SS_ISCONNECTED 2066 ); 2067 NET_UNLOCK_GIANT(); 2068 SCTP_INP_WLOCK((*stcb)->sctp_ep); 2069 SCTP_TCB_LOCK((*stcb)); 2070 SCTP_INP_WUNLOCK((*stcb)->sctp_ep); 2071 if (so == NULL) { 2072 struct mbuf *op_err; 2073 2074 /* Too many sockets */ 2075#ifdef SCTP_DEBUG 2076 if (sctp_debug_on & SCTP_DEBUG_INPUT1) { 2077 printf("process_cookie_new: no room for another socket!\n"); 2078 } 2079#endif /* SCTP_DEBUG */ 2080 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC); 2081 sctp_abort_association(*inp_p, NULL, m, iphlen, 2082 sh, op_err); 2083 sctp_free_assoc(*inp_p, *stcb, 0); 2084 return (NULL); 2085 } 2086 inp = (struct sctp_inpcb *)so->so_pcb; 2087 inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE | 2088 SCTP_PCB_FLAGS_CONNECTED | 2089 SCTP_PCB_FLAGS_IN_TCPPOOL | 2090 (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) | 2091 SCTP_PCB_FLAGS_DONT_WAKE); 2092 inp->sctp_features = (*inp_p)->sctp_features; 2093 inp->sctp_socket = so; 2094 inp->sctp_frag_point = (*inp_p)->sctp_frag_point; 2095 inp->partial_delivery_point = (*inp_p)->partial_delivery_point; 2096 inp->sctp_context = (*inp_p)->sctp_context; 2097 inp->inp_starting_point_for_iterator = NULL; 2098 /* 2099 * copy in the authentication parameters from the 2100 * original endpoint 2101 */ 2102 if (inp->sctp_ep.local_hmacs) 2103 sctp_free_hmaclist(inp->sctp_ep.local_hmacs); 2104 inp->sctp_ep.local_hmacs = 2105 sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs); 2106 if (inp->sctp_ep.local_auth_chunks) 2107 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks); 2108 inp->sctp_ep.local_auth_chunks = 2109 sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks); 2110 (void)sctp_copy_skeylist(&(*inp_p)->sctp_ep.shared_keys, 2111 &inp->sctp_ep.shared_keys); 2112 2113 /* 2114 * Now we must move it from one hash table to 2115 * another and get the tcb in the right place. 2116 */ 2117 sctp_move_pcb_and_assoc(*inp_p, inp, *stcb); 2118 2119 sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb); 2120 2121 /* Switch over to the new guy */ 2122 *inp_p = inp; 2123 2124 sctp_ulp_notify(notification, *stcb, 0, NULL); 2125 return (m); 2126 } 2127 } 2128 if ((notification) && ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE)) { 2129 sctp_ulp_notify(notification, *stcb, 0, NULL); 2130 } 2131 return (m); 2132} 2133 2134static void 2135sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp, 2136 struct sctp_tcb *stcb, struct sctp_nets *net) 2137{ 2138 /* cp must not be used, others call this without a c-ack :-) */ 2139 struct sctp_association *asoc; 2140 2141#ifdef SCTP_DEBUG 2142 if (sctp_debug_on & SCTP_DEBUG_INPUT2) { 2143 printf("sctp_handle_cookie_ack: handling COOKIE-ACK\n"); 2144 } 2145#endif 2146 if (stcb == NULL) 2147 return; 2148 2149 asoc = &stcb->asoc; 2150 2151 sctp_stop_all_cookie_timers(stcb); 2152 /* process according to association state */ 2153 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) { 2154 /* state change only needed when I am in right state */ 2155#ifdef SCTP_DEBUG 2156 if (sctp_debug_on & SCTP_DEBUG_INPUT2) { 2157 printf("moving to OPEN state\n"); 2158 } 2159#endif 2160 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2161 asoc->state = SCTP_STATE_OPEN | SCTP_STATE_SHUTDOWN_PENDING; 2162 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2163 stcb->sctp_ep, stcb, asoc->primary_destination); 2164 2165 } else { 2166 asoc->state = SCTP_STATE_OPEN; 2167 } 2168 /* update RTO */ 2169 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 2170 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2171 if (asoc->overall_error_count == 0) { 2172 net->RTO = sctp_calculate_rto(stcb, asoc, net, 2173 &asoc->time_entered); 2174 } 2175 SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 2176 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL); 2177 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2178 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 2179 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2180 soisconnected(stcb->sctp_ep->sctp_socket); 2181 } 2182 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 2183 stcb, net); 2184 /* 2185 * since we did not send a HB make sure we don't double 2186 * things 2187 */ 2188 net->hb_responded = 1; 2189 2190 if (stcb->asoc.sctp_autoclose_ticks && 2191 sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2192 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 2193 stcb->sctp_ep, stcb, NULL); 2194 } 2195 /* 2196 * set ASCONF timer if ASCONFs are pending and allowed (eg. 2197 * addresses changed when init/cookie echo in flight) 2198 */ 2199 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) && 2200 (stcb->asoc.peer_supports_asconf) && 2201 (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) { 2202 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, 2203 stcb->sctp_ep, stcb, 2204 stcb->asoc.primary_destination); 2205 } 2206 } 2207 /* Toss the cookie if I can */ 2208 sctp_toss_old_cookies(stcb, asoc); 2209 if (!TAILQ_EMPTY(&asoc->sent_queue)) { 2210 /* Restart the timer if we have pending data */ 2211 struct sctp_tmit_chunk *chk; 2212 2213 chk = TAILQ_FIRST(&asoc->sent_queue); 2214 if (chk) { 2215 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 2216 stcb, chk->whoTo); 2217 } 2218 } 2219} 2220 2221static void 2222sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp, 2223 struct sctp_tcb *stcb) 2224{ 2225 struct sctp_nets *net; 2226 struct sctp_tmit_chunk *lchk; 2227 uint32_t tsn; 2228 2229 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_ecne_chunk)) { 2230 return; 2231 } 2232 SCTP_STAT_INCR(sctps_recvecne); 2233 tsn = ntohl(cp->tsn); 2234 /* ECN Nonce stuff: need a resync and disable the nonce sum check */ 2235 /* Also we make sure we disable the nonce_wait */ 2236 lchk = TAILQ_FIRST(&stcb->asoc.send_queue); 2237 if (lchk == NULL) { 2238 stcb->asoc.nonce_resync_tsn = stcb->asoc.sending_seq; 2239 } else { 2240 stcb->asoc.nonce_resync_tsn = lchk->rec.data.TSN_seq; 2241 } 2242 stcb->asoc.nonce_wait_for_ecne = 0; 2243 stcb->asoc.nonce_sum_check = 0; 2244 2245 /* Find where it was sent, if possible */ 2246 net = NULL; 2247 lchk = TAILQ_FIRST(&stcb->asoc.sent_queue); 2248 while (lchk) { 2249 if (lchk->rec.data.TSN_seq == tsn) { 2250 net = lchk->whoTo; 2251 break; 2252 } 2253 if (compare_with_wrap(lchk->rec.data.TSN_seq, tsn, MAX_SEQ)) 2254 break; 2255 lchk = TAILQ_NEXT(lchk, sctp_next); 2256 } 2257 if (net == NULL) 2258 /* default is we use the primary */ 2259 net = stcb->asoc.primary_destination; 2260 2261 if (compare_with_wrap(tsn, stcb->asoc.last_cwr_tsn, MAX_TSN)) { 2262#ifdef SCTP_CWND_MONITOR 2263 int old_cwnd; 2264 2265 old_cwnd = net->cwnd; 2266#endif 2267 SCTP_STAT_INCR(sctps_ecnereducedcwnd); 2268 net->ssthresh = net->cwnd / 2; 2269 if (net->ssthresh < net->mtu) { 2270 net->ssthresh = net->mtu; 2271 /* here back off the timer as well, to slow us down */ 2272 net->RTO <<= 2; 2273 } 2274 net->cwnd = net->ssthresh; 2275#ifdef SCTP_CWND_MONITOR 2276 sctp_log_cwnd(stcb, net, (net->cwnd - old_cwnd), SCTP_CWND_LOG_FROM_SAT); 2277#endif 2278 /* 2279 * we reduce once every RTT. So we will only lower cwnd at 2280 * the next sending seq i.e. the resync_tsn. 2281 */ 2282 stcb->asoc.last_cwr_tsn = stcb->asoc.nonce_resync_tsn; 2283 } 2284 /* 2285 * We always send a CWR this way if our previous one was lost our 2286 * peer will get an update, or if it is not time again to reduce we 2287 * still get the cwr to the peer. 2288 */ 2289 sctp_send_cwr(stcb, net, tsn); 2290} 2291 2292static void 2293sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb) 2294{ 2295 /* 2296 * Here we get a CWR from the peer. We must look in the outqueue and 2297 * make sure that we have a covered ECNE in teh control chunk part. 2298 * If so remove it. 2299 */ 2300 struct sctp_tmit_chunk *chk; 2301 struct sctp_ecne_chunk *ecne; 2302 2303 TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) { 2304 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) { 2305 continue; 2306 } 2307 /* 2308 * Look for and remove if it is the right TSN. Since there 2309 * is only ONE ECNE on the control queue at any one time we 2310 * don't need to worry about more than one! 2311 */ 2312 ecne = mtod(chk->data, struct sctp_ecne_chunk *); 2313 if (compare_with_wrap(ntohl(cp->tsn), ntohl(ecne->tsn), 2314 MAX_TSN) || (cp->tsn == ecne->tsn)) { 2315 /* this covers this ECNE, we can remove it */ 2316 stcb->asoc.ecn_echo_cnt_onq--; 2317 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, 2318 sctp_next); 2319 if (chk->data) { 2320 sctp_m_freem(chk->data); 2321 chk->data = NULL; 2322 } 2323 stcb->asoc.ctrl_queue_cnt--; 2324 sctp_free_remote_addr(chk->whoTo); 2325 sctp_free_a_chunk(stcb, chk); 2326 break; 2327 } 2328 } 2329} 2330 2331static void 2332sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp, 2333 struct sctp_tcb *stcb, struct sctp_nets *net) 2334{ 2335 struct sctp_association *asoc; 2336 2337#ifdef SCTP_DEBUG 2338 if (sctp_debug_on & SCTP_DEBUG_INPUT2) { 2339 printf("sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n"); 2340 } 2341#endif 2342 if (stcb == NULL) 2343 return; 2344 2345 asoc = &stcb->asoc; 2346 /* process according to association state */ 2347 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 2348 /* unexpected SHUTDOWN-COMPLETE... so ignore... */ 2349 SCTP_TCB_UNLOCK(stcb); 2350 return; 2351 } 2352 /* notify upper layer protocol */ 2353 if (stcb->sctp_socket) { 2354 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL); 2355 /* are the queues empty? they should be */ 2356 if (!TAILQ_EMPTY(&asoc->send_queue) || 2357 !TAILQ_EMPTY(&asoc->sent_queue) || 2358 !TAILQ_EMPTY(&asoc->out_wheel)) { 2359 sctp_report_all_outbound(stcb); 2360 } 2361 } 2362 /* stop the timer */ 2363 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net); 2364 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 2365 /* free the TCB */ 2366 sctp_free_assoc(stcb->sctp_ep, stcb, 0); 2367 return; 2368} 2369 2370static int 2371process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc, 2372 struct sctp_nets *net, uint8_t flg) 2373{ 2374 switch (desc->chunk_type) { 2375 case SCTP_DATA: 2376 /* find the tsn to resend (possibly */ 2377 { 2378 uint32_t tsn; 2379 struct sctp_tmit_chunk *tp1; 2380 2381 tsn = ntohl(desc->tsn_ifany); 2382 tp1 = TAILQ_FIRST(&stcb->asoc.sent_queue); 2383 while (tp1) { 2384 if (tp1->rec.data.TSN_seq == tsn) { 2385 /* found it */ 2386 break; 2387 } 2388 if (compare_with_wrap(tp1->rec.data.TSN_seq, tsn, 2389 MAX_TSN)) { 2390 /* not found */ 2391 tp1 = NULL; 2392 break; 2393 } 2394 tp1 = TAILQ_NEXT(tp1, sctp_next); 2395 } 2396 if (tp1 == NULL) { 2397 /* 2398 * Do it the other way , aka without paying 2399 * attention to queue seq order. 2400 */ 2401 SCTP_STAT_INCR(sctps_pdrpdnfnd); 2402 tp1 = TAILQ_FIRST(&stcb->asoc.sent_queue); 2403 while (tp1) { 2404 if (tp1->rec.data.TSN_seq == tsn) { 2405 /* found it */ 2406 break; 2407 } 2408 tp1 = TAILQ_NEXT(tp1, sctp_next); 2409 } 2410 } 2411 if (tp1 == NULL) { 2412 SCTP_STAT_INCR(sctps_pdrptsnnf); 2413 } 2414 if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) { 2415 uint8_t *ddp; 2416 2417 if ((stcb->asoc.peers_rwnd == 0) && 2418 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 2419 SCTP_STAT_INCR(sctps_pdrpdiwnp); 2420 return (0); 2421 } 2422 if (stcb->asoc.peers_rwnd == 0 && 2423 (flg & SCTP_FROM_MIDDLE_BOX)) { 2424 SCTP_STAT_INCR(sctps_pdrpdizrw); 2425 return (0); 2426 } 2427 ddp = (uint8_t *) (mtod(tp1->data, caddr_t)+ 2428 sizeof(struct sctp_data_chunk)); 2429 { 2430 unsigned int iii; 2431 2432 for (iii = 0; iii < sizeof(desc->data_bytes); 2433 iii++) { 2434 if (ddp[iii] != desc->data_bytes[iii]) { 2435 SCTP_STAT_INCR(sctps_pdrpbadd); 2436 return (-1); 2437 } 2438 } 2439 } 2440 /* 2441 * We zero out the nonce so resync not 2442 * needed 2443 */ 2444 tp1->rec.data.ect_nonce = 0; 2445 2446 if (tp1->do_rtt) { 2447 /* 2448 * this guy had a RTO calculation 2449 * pending on it, cancel it 2450 */ 2451 tp1->whoTo->rto_pending = 0; 2452 tp1->do_rtt = 0; 2453 } 2454 SCTP_STAT_INCR(sctps_pdrpmark); 2455 if (tp1->sent != SCTP_DATAGRAM_RESEND) 2456 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 2457 tp1->sent = SCTP_DATAGRAM_RESEND; 2458 /* 2459 * mark it as if we were doing a FR, since 2460 * we will be getting gap ack reports behind 2461 * the info from the router. 2462 */ 2463 tp1->rec.data.doing_fast_retransmit = 1; 2464 /* 2465 * mark the tsn with what sequences can 2466 * cause a new FR. 2467 */ 2468 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) { 2469 tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq; 2470 } else { 2471 tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq; 2472 } 2473 2474 /* restart the timer */ 2475 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 2476 stcb, tp1->whoTo); 2477 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 2478 stcb, tp1->whoTo); 2479 2480 /* fix counts and things */ 2481 if (tp1->whoTo->flight_size >= tp1->book_size) 2482 tp1->whoTo->flight_size -= tp1->book_size; 2483 else 2484 tp1->whoTo->flight_size = 0; 2485 2486 if (stcb->asoc.total_flight >= tp1->book_size) { 2487 stcb->asoc.total_flight -= tp1->book_size; 2488 if (stcb->asoc.total_flight_count > 0) 2489 stcb->asoc.total_flight_count--; 2490 } else { 2491 stcb->asoc.total_flight = 0; 2492 stcb->asoc.total_flight_count = 0; 2493 } 2494 tp1->snd_count--; 2495 } { 2496 /* audit code */ 2497 unsigned int audit; 2498 2499 audit = 0; 2500 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 2501 if (tp1->sent == SCTP_DATAGRAM_RESEND) 2502 audit++; 2503 } 2504 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue, 2505 sctp_next) { 2506 if (tp1->sent == SCTP_DATAGRAM_RESEND) 2507 audit++; 2508 } 2509 if (audit != stcb->asoc.sent_queue_retran_cnt) { 2510 printf("**Local Audit finds cnt:%d asoc cnt:%d\n", 2511 audit, stcb->asoc.sent_queue_retran_cnt); 2512#ifndef SCTP_AUDITING_ENABLED 2513 stcb->asoc.sent_queue_retran_cnt = audit; 2514#endif 2515 } 2516 } 2517 } 2518 break; 2519 case SCTP_ASCONF: 2520 { 2521 struct sctp_tmit_chunk *asconf; 2522 2523 TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue, 2524 sctp_next) { 2525 if (asconf->rec.chunk_id.id == SCTP_ASCONF) { 2526 break; 2527 } 2528 } 2529 if (asconf) { 2530 if (asconf->sent != SCTP_DATAGRAM_RESEND) 2531 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 2532 asconf->sent = SCTP_DATAGRAM_RESEND; 2533 asconf->snd_count--; 2534 } 2535 } 2536 break; 2537 case SCTP_INITIATION: 2538 /* resend the INIT */ 2539 stcb->asoc.dropped_special_cnt++; 2540 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) { 2541 /* 2542 * If we can get it in, in a few attempts we do 2543 * this, otherwise we let the timer fire. 2544 */ 2545 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, 2546 stcb, net); 2547 sctp_send_initiate(stcb->sctp_ep, stcb); 2548 } 2549 break; 2550 case SCTP_SELECTIVE_ACK: 2551 /* resend the sack */ 2552 sctp_send_sack(stcb); 2553 break; 2554 case SCTP_HEARTBEAT_REQUEST: 2555 /* resend a demand HB */ 2556 sctp_send_hb(stcb, 1, net); 2557 break; 2558 case SCTP_SHUTDOWN: 2559 sctp_send_shutdown(stcb, net); 2560 break; 2561 case SCTP_SHUTDOWN_ACK: 2562 sctp_send_shutdown_ack(stcb, net); 2563 break; 2564 case SCTP_COOKIE_ECHO: 2565 { 2566 struct sctp_tmit_chunk *cookie; 2567 2568 cookie = NULL; 2569 TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, 2570 sctp_next) { 2571 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) { 2572 break; 2573 } 2574 } 2575 if (cookie) { 2576 if (cookie->sent != SCTP_DATAGRAM_RESEND) 2577 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 2578 cookie->sent = SCTP_DATAGRAM_RESEND; 2579 sctp_stop_all_cookie_timers(stcb); 2580 } 2581 } 2582 break; 2583 case SCTP_COOKIE_ACK: 2584 sctp_send_cookie_ack(stcb); 2585 break; 2586 case SCTP_ASCONF_ACK: 2587 /* resend last asconf ack */ 2588 sctp_send_asconf_ack(stcb, 1); 2589 break; 2590 case SCTP_FORWARD_CUM_TSN: 2591 send_forward_tsn(stcb, &stcb->asoc); 2592 break; 2593 /* can't do anything with these */ 2594 case SCTP_PACKET_DROPPED: 2595 case SCTP_INITIATION_ACK: /* this should not happen */ 2596 case SCTP_HEARTBEAT_ACK: 2597 case SCTP_ABORT_ASSOCIATION: 2598 case SCTP_OPERATION_ERROR: 2599 case SCTP_SHUTDOWN_COMPLETE: 2600 case SCTP_ECN_ECHO: 2601 case SCTP_ECN_CWR: 2602 default: 2603 break; 2604 } 2605 return (0); 2606} 2607 2608void 2609sctp_reset_in_stream(struct sctp_tcb *stcb, int number_entries, uint16_t * list) 2610{ 2611 int i; 2612 uint16_t temp; 2613 2614 /* 2615 * We set things to 0xffff since this is the last delivered sequence 2616 * and we will be sending in 0 after the reset. 2617 */ 2618 2619 if (number_entries) { 2620 for (i = 0; i < number_entries; i++) { 2621 temp = ntohs(list[i]); 2622 if (temp >= stcb->asoc.streamincnt) { 2623 continue; 2624 } 2625 stcb->asoc.strmin[temp].last_sequence_delivered = 0xffff; 2626 } 2627 } else { 2628 list = NULL; 2629 for (i = 0; i < stcb->asoc.streamincnt; i++) { 2630 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff; 2631 } 2632 } 2633 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list); 2634} 2635 2636static void 2637sctp_reset_out_streams(struct sctp_tcb *stcb, int number_entries, uint16_t * list) 2638{ 2639 int i; 2640 2641 if (number_entries == 0) { 2642 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 2643 stcb->asoc.strmout[i].next_sequence_sent = 0; 2644 } 2645 } else if (number_entries) { 2646 for (i = 0; i < number_entries; i++) { 2647 uint16_t temp; 2648 2649 temp = ntohs(list[i]); 2650 if (temp >= stcb->asoc.streamoutcnt) { 2651 /* no such stream */ 2652 continue; 2653 } 2654 stcb->asoc.strmout[temp].next_sequence_sent = 0; 2655 } 2656 } 2657 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list); 2658} 2659 2660 2661struct sctp_stream_reset_out_request * 2662sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk) 2663{ 2664 struct sctp_association *asoc; 2665 struct sctp_stream_reset_out_req *req; 2666 struct sctp_stream_reset_out_request *r; 2667 struct sctp_tmit_chunk *chk; 2668 int len, clen; 2669 2670 asoc = &stcb->asoc; 2671 if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 2672 return (NULL); 2673 } 2674 if (stcb->asoc.str_reset == NULL) { 2675 return (NULL); 2676 } 2677 chk = stcb->asoc.str_reset; 2678 if (chk->data == NULL) { 2679 return (NULL); 2680 } 2681 if (bchk) { 2682 /* he wants a copy of the chk pointer */ 2683 *bchk = chk; 2684 } 2685 clen = chk->send_size; 2686 req = mtod(chk->data, struct sctp_stream_reset_out_req *); 2687 r = &req->sr_req; 2688 if (ntohl(r->request_seq) == seq) { 2689 /* found it */ 2690 return (r); 2691 } 2692 len = SCTP_SIZE32(ntohs(r->ph.param_length)); 2693 if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) { 2694 /* move to the next one, there can only be a max of two */ 2695 r = (struct sctp_stream_reset_out_request *)((caddr_t)r + len); 2696 if (ntohl(r->request_seq) == seq) { 2697 return (r); 2698 } 2699 } 2700 /* that seq is not here */ 2701 return (NULL); 2702} 2703 2704static void 2705sctp_clean_up_stream_reset(struct sctp_tcb *stcb) 2706{ 2707 struct sctp_association *asoc; 2708 2709 asoc = &stcb->asoc; 2710 struct sctp_tmit_chunk *chk = stcb->asoc.str_reset; 2711 2712 if (stcb->asoc.str_reset == NULL) { 2713 return; 2714 } 2715 sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo); 2716 TAILQ_REMOVE(&asoc->control_send_queue, 2717 chk, 2718 sctp_next); 2719 if (chk->data) { 2720 sctp_m_freem(chk->data); 2721 chk->data = NULL; 2722 } 2723 asoc->ctrl_queue_cnt--; 2724 sctp_free_remote_addr(chk->whoTo); 2725 2726 sctp_free_a_chunk(stcb, chk); 2727 stcb->asoc.str_reset = NULL; 2728} 2729 2730 2731static int 2732sctp_handle_stream_reset_response(struct sctp_tcb *stcb, 2733 uint32_t seq, uint32_t action, 2734 struct sctp_stream_reset_response *respin) 2735{ 2736 uint16_t type; 2737 int lparm_len; 2738 struct sctp_association *asoc = &stcb->asoc; 2739 struct sctp_tmit_chunk *chk; 2740 struct sctp_stream_reset_out_request *srparam; 2741 int number_entries; 2742 2743 if (asoc->stream_reset_outstanding == 0) { 2744 /* duplicate */ 2745 return (0); 2746 } 2747 if (seq == stcb->asoc.str_reset_seq_out) { 2748 srparam = sctp_find_stream_reset(stcb, seq, &chk); 2749 if (srparam) { 2750 stcb->asoc.str_reset_seq_out++; 2751 type = ntohs(srparam->ph.param_type); 2752 lparm_len = ntohs(srparam->ph.param_length); 2753 if (type == SCTP_STR_RESET_OUT_REQUEST) { 2754 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t); 2755 asoc->stream_reset_out_is_outstanding = 0; 2756 if (asoc->stream_reset_outstanding) 2757 asoc->stream_reset_outstanding--; 2758 if (action == SCTP_STREAM_RESET_PERFORMED) { 2759 /* do it */ 2760 sctp_reset_out_streams(stcb, number_entries, srparam->list_of_streams); 2761 } else { 2762 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, srparam->list_of_streams); 2763 } 2764 } else if (type == SCTP_STR_RESET_IN_REQUEST) { 2765 /* Answered my request */ 2766 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t); 2767 if (asoc->stream_reset_outstanding) 2768 asoc->stream_reset_outstanding--; 2769 if (action != SCTP_STREAM_RESET_PERFORMED) { 2770 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb, number_entries, srparam->list_of_streams); 2771 } 2772 } else if (type == SCTP_STR_RESET_TSN_REQUEST) { 2773 /** 2774 * a) Adopt the new in tsn. 2775 * b) reset the map 2776 * c) Adopt the new out-tsn 2777 */ 2778 struct sctp_stream_reset_response_tsn *resp; 2779 struct sctp_forward_tsn_chunk fwdtsn; 2780 int abort_flag = 0; 2781 2782 if (respin == NULL) { 2783 /* huh ? */ 2784 return (0); 2785 } 2786 if (action == SCTP_STREAM_RESET_PERFORMED) { 2787 resp = (struct sctp_stream_reset_response_tsn *)respin; 2788 asoc->stream_reset_outstanding--; 2789 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 2790 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 2791 fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1); 2792 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag); 2793 if (abort_flag) { 2794 return (1); 2795 } 2796 stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1); 2797 stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 2798 stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn); 2799 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 2800 stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn); 2801 stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn; 2802 2803 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL); 2804 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL); 2805 2806 } 2807 } 2808 /* get rid of the request and get the request flags */ 2809 if (asoc->stream_reset_outstanding == 0) { 2810 sctp_clean_up_stream_reset(stcb); 2811 } 2812 } 2813 } 2814 return (0); 2815} 2816 2817static void 2818sctp_handle_str_reset_request_in(struct sctp_tcb *stcb, 2819 struct sctp_tmit_chunk *chk, 2820 struct sctp_stream_reset_in_request *req) 2821{ 2822 uint32_t seq; 2823 int len, i; 2824 int number_entries; 2825 uint16_t temp; 2826 2827 /* 2828 * peer wants me to send a str-reset to him for my outgoing seq's if 2829 * seq_in is right. 2830 */ 2831 struct sctp_association *asoc = &stcb->asoc; 2832 2833 seq = ntohl(req->request_seq); 2834 if (asoc->str_reset_seq_in == seq) { 2835 if (stcb->asoc.stream_reset_out_is_outstanding == 0) { 2836 len = ntohs(req->ph.param_length); 2837 number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t)); 2838 for (i = 0; i < number_entries; i++) { 2839 temp = ntohs(req->list_of_streams[i]); 2840 req->list_of_streams[i] = temp; 2841 } 2842 /* move the reset action back one */ 2843 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 2844 asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 2845 sctp_add_stream_reset_out(chk, number_entries, req->list_of_streams, 2846 asoc->str_reset_seq_out, 2847 seq, (asoc->sending_seq - 1)); 2848 asoc->stream_reset_out_is_outstanding = 1; 2849 asoc->str_reset = chk; 2850 sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo); 2851 stcb->asoc.stream_reset_outstanding++; 2852 } else { 2853 /* Can't do it, since we have sent one out */ 2854 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 2855 asoc->last_reset_action[0] = SCTP_STREAM_RESET_TRY_LATER; 2856 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 2857 } 2858 asoc->str_reset_seq_in++; 2859 } else if (asoc->str_reset_seq_in - 1 == seq) { 2860 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 2861 } else if (asoc->str_reset_seq_in - 2 == seq) { 2862 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 2863 } else { 2864 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO); 2865 } 2866} 2867 2868static int 2869sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb, 2870 struct sctp_tmit_chunk *chk, 2871 struct sctp_stream_reset_tsn_request *req) 2872{ 2873 /* reset all in and out and update the tsn */ 2874 /* 2875 * A) reset my str-seq's on in and out. B) Select a receive next, 2876 * and set cum-ack to it. Also process this selected number as a 2877 * fwd-tsn as well. C) set in the response my next sending seq. 2878 */ 2879 struct sctp_forward_tsn_chunk fwdtsn; 2880 struct sctp_association *asoc = &stcb->asoc; 2881 int abort_flag = 0; 2882 uint32_t seq; 2883 2884 seq = ntohl(req->request_seq); 2885 if (asoc->str_reset_seq_in == seq) { 2886 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 2887 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 2888 fwdtsn.ch.chunk_flags = 0; 2889 fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1); 2890 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag); 2891 if (abort_flag) { 2892 return (1); 2893 } 2894 stcb->asoc.highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA; 2895 stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 2896 stcb->asoc.mapping_array_base_tsn = stcb->asoc.highest_tsn_inside_map + 1; 2897 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 2898 atomic_add_int(&stcb->asoc.sending_seq, 1); 2899 /* save off historical data for retrans */ 2900 stcb->asoc.last_sending_seq[1] = stcb->asoc.last_sending_seq[0]; 2901 stcb->asoc.last_sending_seq[0] = stcb->asoc.sending_seq; 2902 stcb->asoc.last_base_tsnsent[1] = stcb->asoc.last_base_tsnsent[0]; 2903 stcb->asoc.last_base_tsnsent[0] = stcb->asoc.mapping_array_base_tsn; 2904 2905 sctp_add_stream_reset_result_tsn(chk, 2906 ntohl(req->request_seq), 2907 SCTP_STREAM_RESET_PERFORMED, 2908 stcb->asoc.sending_seq, 2909 stcb->asoc.mapping_array_base_tsn); 2910 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL); 2911 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL); 2912 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 2913 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 2914 2915 asoc->str_reset_seq_in++; 2916 } else if (asoc->str_reset_seq_in - 1 == seq) { 2917 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 2918 stcb->asoc.last_sending_seq[0], 2919 stcb->asoc.last_base_tsnsent[0] 2920 ); 2921 } else if (asoc->str_reset_seq_in - 2 == seq) { 2922 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1], 2923 stcb->asoc.last_sending_seq[1], 2924 stcb->asoc.last_base_tsnsent[1] 2925 ); 2926 } else { 2927 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO); 2928 } 2929 return (0); 2930} 2931 2932static void 2933sctp_handle_str_reset_request_out(struct sctp_tcb *stcb, 2934 struct sctp_tmit_chunk *chk, 2935 struct sctp_stream_reset_out_request *req) 2936{ 2937 uint32_t seq, tsn; 2938 int number_entries, len; 2939 struct sctp_association *asoc = &stcb->asoc; 2940 2941 seq = ntohl(req->request_seq); 2942 2943 /* now if its not a duplicate we process it */ 2944 if (asoc->str_reset_seq_in == seq) { 2945 len = ntohs(req->ph.param_length); 2946 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t)); 2947 /* 2948 * the sender is resetting, handle the list issue.. we must 2949 * a) verify if we can do the reset, if so no problem b) If 2950 * we can't do the reset we must copy the request. c) queue 2951 * it, and setup the data in processor to trigger it off 2952 * when needed and dequeue all the queued data. 2953 */ 2954 tsn = ntohl(req->send_reset_at_tsn); 2955 2956 /* move the reset action back one */ 2957 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 2958 if ((tsn == asoc->cumulative_tsn) || 2959 (compare_with_wrap(asoc->cumulative_tsn, tsn, MAX_TSN))) { 2960 /* we can do it now */ 2961 sctp_reset_in_stream(stcb, number_entries, req->list_of_streams); 2962 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_PERFORMED); 2963 asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 2964 } else { 2965 /* 2966 * we must queue it up and thus wait for the TSN's 2967 * to arrive that are at or before tsn 2968 */ 2969 struct sctp_stream_reset_list *liste; 2970 int siz; 2971 2972 siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t)); 2973 SCTP_MALLOC(liste, struct sctp_stream_reset_list *, 2974 siz, "StrRstList"); 2975 if (liste == NULL) { 2976 /* gak out of memory */ 2977 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_DENIED); 2978 asoc->last_reset_action[0] = SCTP_STREAM_RESET_DENIED; 2979 return; 2980 } 2981 liste->tsn = tsn; 2982 liste->number_entries = number_entries; 2983 memcpy(&liste->req, req, 2984 (sizeof(struct sctp_stream_reset_out_request) + (number_entries * sizeof(uint16_t)))); 2985 TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp); 2986 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_PERFORMED); 2987 asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 2988 } 2989 asoc->str_reset_seq_in++; 2990 } else if ((asoc->str_reset_seq_in - 1) == seq) { 2991 /* 2992 * one seq back, just echo back last action since my 2993 * response was lost. 2994 */ 2995 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 2996 } else if ((asoc->str_reset_seq_in - 2) == seq) { 2997 /* 2998 * two seq back, just echo back last action since my 2999 * response was lost. 3000 */ 3001 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3002 } else { 3003 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO); 3004 } 3005} 3006 3007static int 3008sctp_handle_stream_reset(struct sctp_tcb *stcb, struct sctp_stream_reset_out_req *sr_req) 3009{ 3010 int chk_length, param_len, ptype; 3011 uint32_t seq; 3012 int num_req = 0; 3013 struct sctp_tmit_chunk *chk; 3014 struct sctp_chunkhdr *ch; 3015 struct sctp_paramhdr *ph; 3016 3017 /* now it may be a reset or a reset-response */ 3018 chk_length = ntohs(sr_req->ch.chunk_length); 3019 int ret_code = 0; 3020 int num_param = 0; 3021 3022 /* setup for adding the response */ 3023 sctp_alloc_a_chunk(stcb, chk); 3024 if (chk == NULL) { 3025 return (ret_code); 3026 } 3027 chk->rec.chunk_id.id = SCTP_STREAM_RESET; 3028 chk->asoc = &stcb->asoc; 3029 chk->no_fr_allowed = 0; 3030 chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr); 3031 chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_DONTWAIT, 1, MT_DATA); 3032 if (chk->data == NULL) { 3033strres_nochunk: 3034 if (chk->data) { 3035 sctp_m_freem(chk->data); 3036 chk->data = NULL; 3037 } 3038 sctp_free_a_chunk(stcb, chk); 3039 return (ret_code); 3040 } 3041 chk->data->m_data += SCTP_MIN_OVERHEAD; 3042 3043 /* setup chunk parameters */ 3044 chk->sent = SCTP_DATAGRAM_UNSENT; 3045 chk->snd_count = 0; 3046 chk->whoTo = stcb->asoc.primary_destination; 3047 atomic_add_int(&chk->whoTo->ref_count, 1); 3048 3049 ch = mtod(chk->data, struct sctp_chunkhdr *); 3050 ch->chunk_type = SCTP_STREAM_RESET; 3051 ch->chunk_flags = 0; 3052 ch->chunk_length = htons(chk->send_size); 3053 chk->data->m_pkthdr.len = chk->data->m_len = SCTP_SIZE32(chk->send_size); 3054 3055 3056 ph = (struct sctp_paramhdr *)&sr_req->sr_req; 3057 while ((size_t)chk_length >= sizeof(struct sctp_stream_reset_tsn_request)) { 3058 param_len = ntohs(ph->param_length); 3059 if (param_len < (int)sizeof(struct sctp_stream_reset_tsn_request)) { 3060 /* bad param */ 3061 break; 3062 } 3063 ptype = ntohs(ph->param_type); 3064 num_param++; 3065 if (num_param > SCTP_MAX_RESET_PARAMS) { 3066 /* hit the max of parameters already sorry.. */ 3067 break; 3068 } 3069 if (ptype == SCTP_STR_RESET_OUT_REQUEST) { 3070 struct sctp_stream_reset_out_request *req_out; 3071 3072 req_out = (struct sctp_stream_reset_out_request *)ph; 3073 num_req++; 3074 if (stcb->asoc.stream_reset_outstanding) { 3075 seq = ntohl(req_out->response_seq); 3076 if (seq == stcb->asoc.str_reset_seq_out) { 3077 /* implicit ack */ 3078 sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_PERFORMED, NULL); 3079 } 3080 } 3081 sctp_handle_str_reset_request_out(stcb, chk, req_out); 3082 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) { 3083 struct sctp_stream_reset_in_request *req_in; 3084 3085 num_req++; 3086 req_in = (struct sctp_stream_reset_in_request *)ph; 3087 sctp_handle_str_reset_request_in(stcb, chk, req_in); 3088 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) { 3089 struct sctp_stream_reset_tsn_request *req_tsn; 3090 3091 num_req++; 3092 req_tsn = (struct sctp_stream_reset_tsn_request *)ph; 3093 if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) { 3094 ret_code = 1; 3095 goto strres_nochunk; 3096 } 3097 /* no more */ 3098 break; 3099 } else if (ptype == SCTP_STR_RESET_RESPONSE) { 3100 struct sctp_stream_reset_response *resp; 3101 uint32_t result; 3102 3103 resp = (struct sctp_stream_reset_response *)ph; 3104 seq = ntohl(resp->response_seq); 3105 result = ntohl(resp->result); 3106 if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) { 3107 ret_code = 1; 3108 goto strres_nochunk; 3109 } 3110 } else { 3111 break; 3112 } 3113 3114 ph = (struct sctp_paramhdr *)((caddr_t)ph + SCTP_SIZE32(param_len)); 3115 chk_length -= SCTP_SIZE32(param_len); 3116 } 3117 if (num_req == 0) { 3118 /* we have no response free the stuff */ 3119 goto strres_nochunk; 3120 } 3121 /* ok we have a chunk to link in */ 3122 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, 3123 chk, 3124 sctp_next); 3125 stcb->asoc.ctrl_queue_cnt++; 3126 return (ret_code); 3127} 3128 3129/* 3130 * Handle a router or endpoints report of a packet loss, there are two ways 3131 * to handle this, either we get the whole packet and must disect it 3132 * ourselves (possibly with truncation and or corruption) or it is a summary 3133 * from a middle box that did the disectting for us. 3134 */ 3135static void 3136sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp, 3137 struct sctp_tcb *stcb, struct sctp_nets *net) 3138{ 3139 uint32_t bottle_bw, on_queue; 3140 uint16_t trunc_len; 3141 unsigned int chlen; 3142 unsigned int at; 3143 struct sctp_chunk_desc desc; 3144 struct sctp_chunkhdr *ch; 3145 3146 chlen = ntohs(cp->ch.chunk_length); 3147 chlen -= sizeof(struct sctp_pktdrop_chunk); 3148 /* XXX possible chlen underflow */ 3149 if (chlen == 0) { 3150 ch = NULL; 3151 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) 3152 SCTP_STAT_INCR(sctps_pdrpbwrpt); 3153 } else { 3154 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr)); 3155 chlen -= sizeof(struct sctphdr); 3156 /* XXX possible chlen underflow */ 3157 memset(&desc, 0, sizeof(desc)); 3158 } 3159 trunc_len = (uint16_t) ntohs(cp->trunc_len); 3160 /* now the chunks themselves */ 3161 while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) { 3162 desc.chunk_type = ch->chunk_type; 3163 /* get amount we need to move */ 3164 at = ntohs(ch->chunk_length); 3165 if (at < sizeof(struct sctp_chunkhdr)) { 3166 /* corrupt chunk, maybe at the end? */ 3167 SCTP_STAT_INCR(sctps_pdrpcrupt); 3168 break; 3169 } 3170 if (trunc_len == 0) { 3171 /* we are supposed to have all of it */ 3172 if (at > chlen) { 3173 /* corrupt skip it */ 3174 SCTP_STAT_INCR(sctps_pdrpcrupt); 3175 break; 3176 } 3177 } else { 3178 /* is there enough of it left ? */ 3179 if (desc.chunk_type == SCTP_DATA) { 3180 if (chlen < (sizeof(struct sctp_data_chunk) + 3181 sizeof(desc.data_bytes))) { 3182 break; 3183 } 3184 } else { 3185 if (chlen < sizeof(struct sctp_chunkhdr)) { 3186 break; 3187 } 3188 } 3189 } 3190 if (desc.chunk_type == SCTP_DATA) { 3191 /* can we get out the tsn? */ 3192 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 3193 SCTP_STAT_INCR(sctps_pdrpmbda); 3194 3195 if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) { 3196 /* yep */ 3197 struct sctp_data_chunk *dcp; 3198 uint8_t *ddp; 3199 unsigned int iii; 3200 3201 dcp = (struct sctp_data_chunk *)ch; 3202 ddp = (uint8_t *) (dcp + 1); 3203 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) { 3204 desc.data_bytes[iii] = ddp[iii]; 3205 } 3206 desc.tsn_ifany = dcp->dp.tsn; 3207 } else { 3208 /* nope we are done. */ 3209 SCTP_STAT_INCR(sctps_pdrpnedat); 3210 break; 3211 } 3212 } else { 3213 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 3214 SCTP_STAT_INCR(sctps_pdrpmbct); 3215 } 3216 3217 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) { 3218 SCTP_STAT_INCR(sctps_pdrppdbrk); 3219 break; 3220 } 3221 if (SCTP_SIZE32(at) > chlen) { 3222 break; 3223 } 3224 chlen -= SCTP_SIZE32(at); 3225 if (chlen < sizeof(struct sctp_chunkhdr)) { 3226 /* done, none left */ 3227 break; 3228 } 3229 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at)); 3230 } 3231 /* Now update any rwnd --- possibly */ 3232 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) { 3233 /* From a peer, we get a rwnd report */ 3234 uint32_t a_rwnd; 3235 3236 SCTP_STAT_INCR(sctps_pdrpfehos); 3237 3238 bottle_bw = ntohl(cp->bottle_bw); 3239 on_queue = ntohl(cp->current_onq); 3240 if (bottle_bw && on_queue) { 3241 /* a rwnd report is in here */ 3242 if (bottle_bw > on_queue) 3243 a_rwnd = bottle_bw - on_queue; 3244 else 3245 a_rwnd = 0; 3246 3247 if (a_rwnd == 0) 3248 stcb->asoc.peers_rwnd = 0; 3249 else { 3250 if (a_rwnd > stcb->asoc.total_flight) { 3251 stcb->asoc.peers_rwnd = 3252 a_rwnd - stcb->asoc.total_flight; 3253 } else { 3254 stcb->asoc.peers_rwnd = 0; 3255 } 3256 if (stcb->asoc.peers_rwnd < 3257 stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 3258 /* SWS sender side engages */ 3259 stcb->asoc.peers_rwnd = 0; 3260 } 3261 } 3262 } 3263 } else { 3264 SCTP_STAT_INCR(sctps_pdrpfmbox); 3265 } 3266 3267 /* now middle boxes in sat networks get a cwnd bump */ 3268 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) && 3269 (stcb->asoc.sat_t3_loss_recovery == 0) && 3270 (stcb->asoc.sat_network)) { 3271 /* 3272 * This is debateable but for sat networks it makes sense 3273 * Note if a T3 timer has went off, we will prohibit any 3274 * changes to cwnd until we exit the t3 loss recovery. 3275 */ 3276 uint32_t bw_avail; 3277 int rtt, incr; 3278 3279#ifdef SCTP_CWND_MONITOR 3280 int old_cwnd = net->cwnd; 3281 3282#endif 3283 /* need real RTT for this calc */ 3284 rtt = ((net->lastsa >> 2) + net->lastsv) >> 1; 3285 /* get bottle neck bw */ 3286 bottle_bw = ntohl(cp->bottle_bw); 3287 /* and whats on queue */ 3288 on_queue = ntohl(cp->current_onq); 3289 /* 3290 * adjust the on-queue if our flight is more it could be 3291 * that the router has not yet gotten data "in-flight" to it 3292 */ 3293 if (on_queue < net->flight_size) 3294 on_queue = net->flight_size; 3295 3296 /* calculate the available space */ 3297 bw_avail = (bottle_bw * rtt) / 1000; 3298 if (bw_avail > bottle_bw) { 3299 /* 3300 * Cap the growth to no more than the bottle neck. 3301 * This can happen as RTT slides up due to queues. 3302 * It also means if you have more than a 1 second 3303 * RTT with a empty queue you will be limited to the 3304 * bottle_bw per second no matter if other points 3305 * have 1/2 the RTT and you could get more out... 3306 */ 3307 bw_avail = bottle_bw; 3308 } 3309 if (on_queue > bw_avail) { 3310 /* 3311 * No room for anything else don't allow anything 3312 * else to be "added to the fire". 3313 */ 3314 int seg_inflight, seg_onqueue, my_portion; 3315 3316 net->partial_bytes_acked = 0; 3317 3318 /* how much are we over queue size? */ 3319 incr = on_queue - bw_avail; 3320 if (stcb->asoc.seen_a_sack_this_pkt) { 3321 /* 3322 * undo any cwnd adjustment that the sack 3323 * might have made 3324 */ 3325 net->cwnd = net->prev_cwnd; 3326 } 3327 /* Now how much of that is mine? */ 3328 seg_inflight = net->flight_size / net->mtu; 3329 seg_onqueue = on_queue / net->mtu; 3330 my_portion = (incr * seg_inflight) / seg_onqueue; 3331 3332 /* Have I made an adjustment already */ 3333 if (net->cwnd > net->flight_size) { 3334 /* 3335 * for this flight I made an adjustment we 3336 * need to decrease the portion by a share 3337 * our previous adjustment. 3338 */ 3339 int diff_adj; 3340 3341 diff_adj = net->cwnd - net->flight_size; 3342 if (diff_adj > my_portion) 3343 my_portion = 0; 3344 else 3345 my_portion -= diff_adj; 3346 } 3347 /* 3348 * back down to the previous cwnd (assume we have 3349 * had a sack before this packet). minus what ever 3350 * portion of the overage is my fault. 3351 */ 3352 net->cwnd -= my_portion; 3353 3354 /* we will NOT back down more than 1 MTU */ 3355 if (net->cwnd <= net->mtu) { 3356 net->cwnd = net->mtu; 3357 } 3358 /* force into CA */ 3359 net->ssthresh = net->cwnd - 1; 3360 } else { 3361 /* 3362 * Take 1/4 of the space left or max burst up .. 3363 * whichever is less. 3364 */ 3365 incr = min((bw_avail - on_queue) >> 2, 3366 (int)stcb->asoc.max_burst * (int)net->mtu); 3367 net->cwnd += incr; 3368 } 3369 if (net->cwnd > bw_avail) { 3370 /* We can't exceed the pipe size */ 3371 net->cwnd = bw_avail; 3372 } 3373 if (net->cwnd < net->mtu) { 3374 /* We always have 1 MTU */ 3375 net->cwnd = net->mtu; 3376 } 3377#ifdef SCTP_CWND_MONITOR 3378 if (net->cwnd - old_cwnd != 0) { 3379 /* log only changes */ 3380 sctp_log_cwnd(stcb, net, (net->cwnd - old_cwnd), 3381 SCTP_CWND_LOG_FROM_SAT); 3382 } 3383#endif 3384 } 3385} 3386 3387extern int sctp_strict_init; 3388extern int sctp_abort_if_one_2_one_hits_limit; 3389 3390/* 3391 * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to 3392 * still contain IP/SCTP header - stcb: is the tcb found for this packet - 3393 * offset: offset into the mbuf chain to first chunkhdr - length: is the 3394 * length of the complete packet outputs: - length: modified to remaining 3395 * length after control processing - netp: modified to new sctp_nets after 3396 * cookie-echo processing - return NULL to discard the packet (ie. no asoc, 3397 * bad packet,...) otherwise return the tcb for this packet 3398 */ 3399static struct sctp_tcb * 3400sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length, 3401 struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp, 3402 struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen) 3403{ 3404 struct sctp_association *asoc; 3405 uint32_t vtag_in; 3406 int num_chunks = 0; /* number of control chunks processed */ 3407 int chk_length; 3408 int ret; 3409 3410 /* 3411 * How big should this be, and should it be alloc'd? Lets try the 3412 * d-mtu-ceiling for now (2k) and that should hopefully work ... 3413 * until we get into jumbo grams and such.. 3414 */ 3415 uint8_t chunk_buf[DEFAULT_CHUNK_BUFFER]; 3416 struct sctp_tcb *locked_tcb = stcb; 3417 int got_auth = 0; 3418 uint32_t auth_offset = 0, auth_len = 0; 3419 int auth_skipped = 0; 3420 3421#ifdef SCTP_DEBUG 3422 if (sctp_debug_on & SCTP_DEBUG_INPUT1) { 3423 printf("sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n", 3424 iphlen, *offset, length, stcb); 3425 } 3426#endif /* SCTP_DEBUG */ 3427 3428 /* validate chunk header length... */ 3429 if (ntohs(ch->chunk_length) < sizeof(*ch)) { 3430 return (NULL); 3431 } 3432 /* 3433 * validate the verification tag 3434 */ 3435 vtag_in = ntohl(sh->v_tag); 3436 3437 if (ch->chunk_type == SCTP_INITIATION) { 3438 if (vtag_in != 0) { 3439 /* protocol error- silently discard... */ 3440 SCTP_STAT_INCR(sctps_badvtag); 3441 if (locked_tcb) 3442 SCTP_TCB_UNLOCK(locked_tcb); 3443 return (NULL); 3444 } 3445 } else if (ch->chunk_type != SCTP_COOKIE_ECHO) { 3446 /* 3447 * If there is no stcb, skip the AUTH chunk and process 3448 * later after a stcb is found (to validate the lookup was 3449 * valid. 3450 */ 3451 if ((ch->chunk_type == SCTP_AUTHENTICATION) && 3452 (stcb == NULL) && !sctp_auth_disable) { 3453 /* save this chunk for later processing */ 3454 auth_skipped = 1; 3455 auth_offset = *offset; 3456 auth_len = ntohs(ch->chunk_length); 3457 3458 /* (temporarily) move past this chunk */ 3459 *offset += SCTP_SIZE32(auth_len); 3460 if (*offset >= length) { 3461 /* no more data left in the mbuf chain */ 3462 *offset = length; 3463 return (NULL); 3464 } 3465 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 3466 sizeof(struct sctp_chunkhdr), chunk_buf); 3467 } 3468 if (ch->chunk_type == SCTP_COOKIE_ECHO) { 3469 goto process_control_chunks; 3470 } 3471 /* 3472 * first check if it's an ASCONF with an unknown src addr we 3473 * need to look inside to find the association 3474 */ 3475 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) { 3476 /* inp's refcount may be reduced */ 3477 SCTP_INP_INCR_REF(inp); 3478 3479 stcb = sctp_findassociation_ep_asconf(m, iphlen, 3480 *offset, sh, &inp, netp); 3481 if (stcb == NULL) { 3482 /* 3483 * reduce inp's refcount if not reduced in 3484 * sctp_findassociation_ep_asconf(). 3485 */ 3486 SCTP_INP_DECR_REF(inp); 3487 } 3488 /* now go back and verify any auth chunk to be sure */ 3489 if (auth_skipped && (stcb != NULL)) { 3490 struct sctp_auth_chunk *auth; 3491 3492 auth = (struct sctp_auth_chunk *) 3493 sctp_m_getptr(m, auth_offset, 3494 auth_len, chunk_buf); 3495 got_auth = 1; 3496 auth_skipped = 0; 3497 if (sctp_handle_auth(stcb, auth, m, 3498 auth_offset)) { 3499 /* auth HMAC failed so dump it */ 3500 *offset = length; 3501 return (NULL); 3502 } else { 3503 /* remaining chunks are HMAC checked */ 3504 stcb->asoc.authenticated = 1; 3505 } 3506 } 3507 } 3508 if (stcb == NULL) { 3509 /* no association, so it's out of the blue... */ 3510 sctp_handle_ootb(m, iphlen, *offset, sh, inp, NULL); 3511 *offset = length; 3512 if (locked_tcb) 3513 SCTP_TCB_UNLOCK(locked_tcb); 3514 return (NULL); 3515 } 3516 asoc = &stcb->asoc; 3517 /* ABORT and SHUTDOWN can use either v_tag... */ 3518 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) || 3519 (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) || 3520 (ch->chunk_type == SCTP_PACKET_DROPPED)) { 3521 if ((vtag_in == asoc->my_vtag) || 3522 ((ch->chunk_flags & SCTP_HAD_NO_TCB) && 3523 (vtag_in == asoc->peer_vtag))) { 3524 /* this is valid */ 3525 } else { 3526 /* drop this packet... */ 3527 SCTP_STAT_INCR(sctps_badvtag); 3528 if (locked_tcb) 3529 SCTP_TCB_UNLOCK(locked_tcb); 3530 return (NULL); 3531 } 3532 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 3533 if (vtag_in != asoc->my_vtag) { 3534 /* 3535 * this could be a stale SHUTDOWN-ACK or the 3536 * peer never got the SHUTDOWN-COMPLETE and 3537 * is still hung; we have started a new asoc 3538 * but it won't complete until the shutdown 3539 * is completed 3540 */ 3541 if (locked_tcb) 3542 SCTP_TCB_UNLOCK(locked_tcb); 3543 sctp_handle_ootb(m, iphlen, *offset, sh, inp, 3544 NULL); 3545 return (NULL); 3546 } 3547 } else { 3548 /* for all other chunks, vtag must match */ 3549 if (vtag_in != asoc->my_vtag) { 3550 /* invalid vtag... */ 3551#ifdef SCTP_DEBUG 3552 if (sctp_debug_on & SCTP_DEBUG_INPUT3) { 3553 printf("invalid vtag: %xh, expect %xh\n", vtag_in, asoc->my_vtag); 3554 } 3555#endif /* SCTP_DEBUG */ 3556 SCTP_STAT_INCR(sctps_badvtag); 3557 if (locked_tcb) 3558 SCTP_TCB_UNLOCK(locked_tcb); 3559 *offset = length; 3560 return (NULL); 3561 } 3562 } 3563 } /* end if !SCTP_COOKIE_ECHO */ 3564 /* 3565 * process all control chunks... 3566 */ 3567 if (((ch->chunk_type == SCTP_SELECTIVE_ACK) || 3568 (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) && 3569 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) { 3570 /* implied cookie-ack.. we must have lost the ack */ 3571 stcb->asoc.overall_error_count = 0; 3572 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, 3573 *netp); 3574 } 3575process_control_chunks: 3576 3577 while (IS_SCTP_CONTROL(ch)) { 3578 /* validate chunk length */ 3579 chk_length = ntohs(ch->chunk_length); 3580#ifdef SCTP_DEBUG 3581 if (sctp_debug_on & SCTP_DEBUG_INPUT2) { 3582 printf("sctp_process_control: processing a chunk type=%u, len=%u\n", 3583 ch->chunk_type, chk_length); 3584 } 3585#endif /* SCTP_DEBUG */ 3586 if ((size_t)chk_length < sizeof(*ch) || 3587 (*offset + chk_length) > length) { 3588 *offset = length; 3589 if (locked_tcb) 3590 SCTP_TCB_UNLOCK(locked_tcb); 3591 return (NULL); 3592 } 3593 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks); 3594 /* 3595 * INIT-ACK only gets the init ack "header" portion only 3596 * because we don't have to process the peer's COOKIE. All 3597 * others get a complete chunk. 3598 */ 3599 if (ch->chunk_type == SCTP_INITIATION_ACK) { 3600 /* get an init-ack chunk */ 3601 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 3602 sizeof(struct sctp_init_ack_chunk), chunk_buf); 3603 if (ch == NULL) { 3604 *offset = length; 3605 if (locked_tcb) 3606 SCTP_TCB_UNLOCK(locked_tcb); 3607 return (NULL); 3608 } 3609 } else { 3610 /* get a complete chunk... */ 3611 if ((size_t)chk_length > sizeof(chunk_buf)) { 3612 struct mbuf *oper; 3613 struct sctp_paramhdr *phdr; 3614 3615 oper = NULL; 3616 oper = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 3617 1, M_DONTWAIT, 1, MT_DATA); 3618 if (oper) { 3619 /* pre-reserve some space */ 3620 oper->m_data += sizeof(struct sctp_chunkhdr); 3621 oper->m_len = sizeof(struct sctp_paramhdr); 3622 oper->m_pkthdr.len = oper->m_len; 3623 phdr = mtod(oper, struct sctp_paramhdr *); 3624 phdr->param_type = htons(SCTP_CAUSE_OUT_OF_RESC); 3625 phdr->param_length = htons(sizeof(struct sctp_paramhdr)); 3626 sctp_queue_op_err(stcb, oper); 3627 } 3628 if (locked_tcb) 3629 SCTP_TCB_UNLOCK(locked_tcb); 3630 return (NULL); 3631 } 3632 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 3633 chk_length, chunk_buf); 3634 if (ch == NULL) { 3635 printf("sctp_process_control: Can't get the all data....\n"); 3636 *offset = length; 3637 if (locked_tcb) 3638 SCTP_TCB_UNLOCK(locked_tcb); 3639 return (NULL); 3640 } 3641 } 3642 num_chunks++; 3643 /* Save off the last place we got a control from */ 3644 if (stcb != NULL) { 3645 if ((*netp != NULL) || (ch->chunk_type == SCTP_ASCONF)) { 3646 /* 3647 * allow last_control to be NULL if 3648 * ASCONF... ASCONF processing will find the 3649 * right net later 3650 */ 3651 stcb->asoc.last_control_chunk_from = *netp; 3652 } 3653 } 3654#ifdef SCTP_AUDITING_ENABLED 3655 sctp_audit_log(0xB0, ch->chunk_type); 3656#endif 3657 3658 /* check to see if this chunk required auth, but isn't */ 3659 if ((stcb != NULL) && !sctp_auth_disable && 3660 sctp_auth_is_required_chunk(ch->chunk_type, 3661 stcb->asoc.local_auth_chunks) && 3662 !stcb->asoc.authenticated) { 3663 /* "silently" ignore */ 3664 SCTP_STAT_INCR(sctps_recvauthmissing); 3665 goto next_chunk; 3666 } 3667 switch (ch->chunk_type) { 3668 case SCTP_INITIATION: 3669 /* must be first and only chunk */ 3670#ifdef SCTP_DEBUG 3671 if (sctp_debug_on & SCTP_DEBUG_INPUT3) { 3672 printf("SCTP_INIT\n"); 3673 } 3674#endif /* SCTP_DEBUG */ 3675 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 3676 /* We are not interested anymore? */ 3677 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 3678 /* 3679 * collision case where we are 3680 * sending to them too 3681 */ 3682 ; 3683 } else { 3684 if (locked_tcb) 3685 SCTP_TCB_UNLOCK(locked_tcb); 3686 *offset = length; 3687 return (NULL); 3688 } 3689 } 3690 if ((num_chunks > 1) || 3691 (sctp_strict_init && (length - *offset > SCTP_SIZE32(chk_length)))) { 3692 *offset = length; 3693 if (locked_tcb) 3694 SCTP_TCB_UNLOCK(locked_tcb); 3695 return (NULL); 3696 } 3697 if ((stcb != NULL) && 3698 (SCTP_GET_STATE(&stcb->asoc) == 3699 SCTP_STATE_SHUTDOWN_ACK_SENT)) { 3700 sctp_send_shutdown_ack(stcb, 3701 stcb->asoc.primary_destination); 3702 *offset = length; 3703 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC); 3704 if (locked_tcb) 3705 SCTP_TCB_UNLOCK(locked_tcb); 3706 return (NULL); 3707 } 3708 sctp_handle_init(m, iphlen, *offset, sh, 3709 (struct sctp_init_chunk *)ch, inp, stcb, *netp); 3710 *offset = length; 3711 if (locked_tcb) 3712 SCTP_TCB_UNLOCK(locked_tcb); 3713 return (NULL); 3714 break; 3715 case SCTP_INITIATION_ACK: 3716 /* must be first and only chunk */ 3717#ifdef SCTP_DEBUG 3718 if (sctp_debug_on & SCTP_DEBUG_INPUT3) { 3719 printf("SCTP_INIT-ACK\n"); 3720 } 3721#endif /* SCTP_DEBUG */ 3722 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 3723 /* We are not interested anymore */ 3724 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 3725 ; 3726 } else { 3727 if (locked_tcb) 3728 SCTP_TCB_UNLOCK(locked_tcb); 3729 *offset = length; 3730 if (stcb) { 3731 sctp_free_assoc(inp, stcb, 0); 3732 } 3733 return (NULL); 3734 } 3735 } 3736 if ((num_chunks > 1) || 3737 (sctp_strict_init && (length - *offset > SCTP_SIZE32(chk_length)))) { 3738 *offset = length; 3739 if (locked_tcb) 3740 SCTP_TCB_UNLOCK(locked_tcb); 3741 return (NULL); 3742 } 3743 ret = sctp_handle_init_ack(m, iphlen, *offset, sh, 3744 (struct sctp_init_ack_chunk *)ch, stcb, *netp); 3745 /* 3746 * Special case, I must call the output routine to 3747 * get the cookie echoed 3748 */ 3749 if ((stcb) && ret == 0) 3750 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC); 3751 *offset = length; 3752 if (locked_tcb) 3753 SCTP_TCB_UNLOCK(locked_tcb); 3754 return (NULL); 3755 break; 3756 case SCTP_SELECTIVE_ACK: 3757#ifdef SCTP_DEBUG 3758 if (sctp_debug_on & SCTP_DEBUG_INPUT3) { 3759 printf("SCTP_SACK\n"); 3760 } 3761#endif /* SCTP_DEBUG */ 3762 SCTP_STAT_INCR(sctps_recvsacks); 3763 { 3764 struct sctp_sack_chunk *sack; 3765 int abort_now = 0; 3766 uint32_t a_rwnd, cum_ack; 3767 uint16_t num_seg; 3768 int nonce_sum_flag; 3769 3770 sack = (struct sctp_sack_chunk *)ch; 3771 3772 nonce_sum_flag = ch->chunk_flags & SCTP_SACK_NONCE_SUM; 3773 cum_ack = ntohl(sack->sack.cum_tsn_ack); 3774 num_seg = ntohs(sack->sack.num_gap_ack_blks); 3775 a_rwnd = (uint32_t) ntohl(sack->sack.a_rwnd); 3776 stcb->asoc.seen_a_sack_this_pkt = 1; 3777 if ((stcb->asoc.pr_sctp_cnt == 0) && 3778 (num_seg == 0) && 3779 ((compare_with_wrap(cum_ack, stcb->asoc.last_acked_seq, MAX_TSN)) || 3780 (cum_ack == stcb->asoc.last_acked_seq)) && 3781 (stcb->asoc.saw_sack_with_frags == 0) && 3782 (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) 3783 ) { 3784 /* 3785 * We have a SIMPLE sack having no 3786 * prior segments and data on sent 3787 * queue to be acked.. Use the 3788 * faster path sack processing. We 3789 * also allow window update sacks 3790 * with no missing segments to go 3791 * this way too. 3792 */ 3793 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, nonce_sum_flag, &abort_now); 3794 } else { 3795 sctp_handle_sack(sack, stcb, *netp, &abort_now); 3796 } 3797 if (abort_now) { 3798 /* ABORT signal from sack processing */ 3799 *offset = length; 3800 return (NULL); 3801 } 3802 } 3803 break; 3804 case SCTP_HEARTBEAT_REQUEST: 3805#ifdef SCTP_DEBUG 3806 if (sctp_debug_on & SCTP_DEBUG_INPUT3) { 3807 printf("SCTP_HEARTBEAT\n"); 3808 } 3809#endif /* SCTP_DEBUG */ 3810 SCTP_STAT_INCR(sctps_recvheartbeat); 3811 sctp_send_heartbeat_ack(stcb, m, *offset, chk_length, 3812 *netp); 3813 3814 /* He's alive so give him credit */ 3815 stcb->asoc.overall_error_count = 0; 3816 break; 3817 case SCTP_HEARTBEAT_ACK: 3818#ifdef SCTP_DEBUG 3819 if (sctp_debug_on & SCTP_DEBUG_INPUT3) { 3820 printf("SCTP_HEARTBEAT-ACK\n"); 3821 } 3822#endif /* SCTP_DEBUG */ 3823 3824 /* He's alive so give him credit */ 3825 stcb->asoc.overall_error_count = 0; 3826 SCTP_STAT_INCR(sctps_recvheartbeatack); 3827 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch, 3828 stcb, *netp); 3829 break; 3830 case SCTP_ABORT_ASSOCIATION: 3831#ifdef SCTP_DEBUG 3832 if (sctp_debug_on & SCTP_DEBUG_INPUT3) { 3833 printf("SCTP_ABORT\n"); 3834 } 3835#endif /* SCTP_DEBUG */ 3836 sctp_handle_abort((struct sctp_abort_chunk *)ch, 3837 stcb, *netp); 3838 *offset = length; 3839 return (NULL); 3840 break; 3841 case SCTP_SHUTDOWN: 3842#ifdef SCTP_DEBUG 3843 if (sctp_debug_on & SCTP_DEBUG_INPUT3) { 3844 printf("SCTP_SHUTDOWN\n"); 3845 } 3846#endif /* SCTP_DEBUG */ 3847 { 3848 int abort_flag = 0; 3849 3850 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch, 3851 stcb, *netp, &abort_flag); 3852 if (abort_flag) { 3853 *offset = length; 3854 return (NULL); 3855 } 3856 } 3857 break; 3858 case SCTP_SHUTDOWN_ACK: 3859#ifdef SCTP_DEBUG 3860 if (sctp_debug_on & SCTP_DEBUG_INPUT3) { 3861 printf("SCTP_SHUTDOWN-ACK\n"); 3862 } 3863#endif /* SCTP_DEBUG */ 3864 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp); 3865 *offset = length; 3866 return (NULL); 3867 break; 3868 case SCTP_OPERATION_ERROR: 3869#ifdef SCTP_DEBUG 3870 if (sctp_debug_on & SCTP_DEBUG_INPUT3) { 3871 printf("SCTP_OP-ERR\n"); 3872 } 3873#endif /* SCTP_DEBUG */ 3874 if (sctp_handle_error(ch, stcb, *netp) < 0) { 3875 *offset = length; 3876 return (NULL); 3877 } 3878 break; 3879 case SCTP_COOKIE_ECHO: 3880#ifdef SCTP_DEBUG 3881 if (sctp_debug_on & SCTP_DEBUG_INPUT3) { 3882 printf("SCTP_COOKIE-ECHO stcb is %p\n", stcb); 3883 } 3884#endif /* SCTP_DEBUG */ 3885 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 3886 ; 3887 } else { 3888 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) && 3889 (stcb == NULL)) { 3890 /* We are not interested anymore */ 3891 *offset = length; 3892 return (NULL); 3893 } 3894 } 3895 /* 3896 * First are we accepting? We do this again here 3897 * since it is possible that a previous endpoint WAS 3898 * listening responded to a INIT-ACK and then 3899 * closed. We opened and bound.. and are now no 3900 * longer listening. 3901 */ 3902 if (inp->sctp_socket->so_qlimit == 0) { 3903 if ((stcb) && (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 3904 /* 3905 * special case, is this a retran'd 3906 * COOKIE-ECHO or a restarting assoc 3907 * that is a peeled off or 3908 * one-to-one style socket. 3909 */ 3910 goto process_cookie_anyway; 3911 } 3912 sctp_abort_association(inp, stcb, m, iphlen, sh, 3913 NULL); 3914 *offset = length; 3915 return (NULL); 3916 } else if (inp->sctp_socket->so_qlimit) { 3917 /* we are accepting so check limits like TCP */ 3918 if (inp->sctp_socket->so_qlen > 3919 inp->sctp_socket->so_qlimit) { 3920 /* no space */ 3921 struct mbuf *oper; 3922 struct sctp_paramhdr *phdr; 3923 3924 if (sctp_abort_if_one_2_one_hits_limit) { 3925 oper = NULL; 3926 oper = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 3927 1, M_DONTWAIT, 1, MT_DATA); 3928 if (oper) { 3929 oper->m_len = 3930 oper->m_pkthdr.len = 3931 sizeof(struct sctp_paramhdr); 3932 phdr = mtod(oper, 3933 struct sctp_paramhdr *); 3934 phdr->param_type = 3935 htons(SCTP_CAUSE_OUT_OF_RESC); 3936 phdr->param_length = 3937 htons(sizeof(struct sctp_paramhdr)); 3938 } 3939 sctp_abort_association(inp, stcb, m, 3940 iphlen, sh, oper); 3941 } 3942 *offset = length; 3943 return (NULL); 3944 } 3945 } 3946 process_cookie_anyway: 3947 { 3948 struct mbuf *ret_buf; 3949 3950 ret_buf = 3951 sctp_handle_cookie_echo(m, iphlen, 3952 *offset, sh, 3953 (struct sctp_cookie_echo_chunk *)ch, 3954 &inp, &stcb, netp, 3955 auth_skipped, 3956 auth_offset, 3957 auth_len); 3958 3959 if (ret_buf == NULL) { 3960 if (locked_tcb) { 3961 SCTP_TCB_UNLOCK(locked_tcb); 3962 } 3963#ifdef SCTP_DEBUG 3964 if (sctp_debug_on & SCTP_DEBUG_INPUT3) { 3965 printf("GAK, null buffer\n"); 3966 } 3967#endif /* SCTP_DEBUG */ 3968 auth_skipped = 0; 3969 *offset = length; 3970 return (NULL); 3971 } 3972 /* if AUTH skipped, see if it verified... */ 3973 if (auth_skipped) { 3974 got_auth = 1; 3975 auth_skipped = 0; 3976 } 3977 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) { 3978 /* 3979 * Restart the timer if we have 3980 * pending data 3981 */ 3982 struct sctp_tmit_chunk *chk; 3983 3984 chk = TAILQ_FIRST(&stcb->asoc.sent_queue); 3985 if (chk) { 3986 sctp_timer_start(SCTP_TIMER_TYPE_SEND, 3987 stcb->sctp_ep, stcb, 3988 chk->whoTo); 3989 } 3990 } 3991 } 3992 break; 3993 case SCTP_COOKIE_ACK: 3994#ifdef SCTP_DEBUG 3995 if (sctp_debug_on & SCTP_DEBUG_INPUT3) { 3996 printf("SCTP_COOKIE-ACK\n"); 3997 } 3998#endif /* SCTP_DEBUG */ 3999 4000 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4001 /* We are not interested anymore */ 4002 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4003 ; 4004 } else { 4005 sctp_free_assoc(inp, stcb, 0); 4006 *offset = length; 4007 return (NULL); 4008 } 4009 } 4010 /* He's alive so give him credit */ 4011 stcb->asoc.overall_error_count = 0; 4012 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp); 4013 break; 4014 case SCTP_ECN_ECHO: 4015#ifdef SCTP_DEBUG 4016 if (sctp_debug_on & SCTP_DEBUG_INPUT3) { 4017 printf("SCTP_ECN-ECHO\n"); 4018 } 4019#endif /* SCTP_DEBUG */ 4020 /* He's alive so give him credit */ 4021 stcb->asoc.overall_error_count = 0; 4022 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, 4023 stcb); 4024 break; 4025 case SCTP_ECN_CWR: 4026#ifdef SCTP_DEBUG 4027 if (sctp_debug_on & SCTP_DEBUG_INPUT3) { 4028 printf("SCTP_ECN-CWR\n"); 4029 } 4030#endif /* SCTP_DEBUG */ 4031 /* He's alive so give him credit */ 4032 stcb->asoc.overall_error_count = 0; 4033 4034 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb); 4035 break; 4036 case SCTP_SHUTDOWN_COMPLETE: 4037#ifdef SCTP_DEBUG 4038 if (sctp_debug_on & SCTP_DEBUG_INPUT3) { 4039 printf("SCTP_SHUTDOWN-COMPLETE\n"); 4040 } 4041#endif /* SCTP_DEBUG */ 4042 /* must be first and only chunk */ 4043 if ((num_chunks > 1) || 4044 (length - *offset > SCTP_SIZE32(chk_length))) { 4045 *offset = length; 4046 if (locked_tcb) 4047 SCTP_TCB_UNLOCK(locked_tcb); 4048 4049 return (NULL); 4050 } 4051 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch, 4052 stcb, *netp); 4053 *offset = length; 4054 return (NULL); 4055 break; 4056 case SCTP_ASCONF: 4057#ifdef SCTP_DEBUG 4058 if (sctp_debug_on & SCTP_DEBUG_INPUT3) { 4059 printf("SCTP_ASCONF\n"); 4060 } 4061#endif /* SCTP_DEBUG */ 4062 /* He's alive so give him credit */ 4063 stcb->asoc.overall_error_count = 0; 4064 4065 sctp_handle_asconf(m, *offset, 4066 (struct sctp_asconf_chunk *)ch, stcb); 4067 break; 4068 case SCTP_ASCONF_ACK: 4069#ifdef SCTP_DEBUG 4070 if (sctp_debug_on & SCTP_DEBUG_INPUT3) { 4071 printf("SCTP_ASCONF-ACK\n"); 4072 } 4073#endif /* SCTP_DEBUG */ 4074 /* He's alive so give him credit */ 4075 stcb->asoc.overall_error_count = 0; 4076 4077 sctp_handle_asconf_ack(m, *offset, 4078 (struct sctp_asconf_ack_chunk *)ch, stcb, *netp); 4079 break; 4080 case SCTP_FORWARD_CUM_TSN: 4081#ifdef SCTP_DEBUG 4082 if (sctp_debug_on & SCTP_DEBUG_INPUT3) { 4083 printf("SCTP_FWD-TSN\n"); 4084 } 4085#endif /* SCTP_DEBUG */ 4086 /* He's alive so give him credit */ 4087 { 4088 int abort_flag = 0; 4089 4090 stcb->asoc.overall_error_count = 0; 4091 *fwd_tsn_seen = 1; 4092 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4093 /* We are not interested anymore */ 4094 sctp_free_assoc(inp, stcb, 0); 4095 *offset = length; 4096 return (NULL); 4097 } 4098 sctp_handle_forward_tsn(stcb, 4099 (struct sctp_forward_tsn_chunk *)ch, &abort_flag); 4100 if (abort_flag) { 4101 *offset = length; 4102 return (NULL); 4103 } else { 4104 stcb->asoc.overall_error_count = 0; 4105 } 4106 4107 } 4108 break; 4109 case SCTP_STREAM_RESET: 4110#ifdef SCTP_DEBUG 4111 if (sctp_debug_on & SCTP_DEBUG_INPUT3) { 4112 printf("SCTP_STREAM_RESET\n"); 4113 } 4114#endif /* SCTP_DEBUG */ 4115 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4116 chk_length, chunk_buf); 4117 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4118 /* We are not interested anymore */ 4119 sctp_free_assoc(inp, stcb, 0); 4120 *offset = length; 4121 return (NULL); 4122 } 4123 if (stcb->asoc.peer_supports_strreset == 0) { 4124 /* 4125 * hmm, peer should have announced this, but 4126 * we will turn it on since he is sending us 4127 * a stream reset. 4128 */ 4129 stcb->asoc.peer_supports_strreset = 1; 4130 } 4131 if (sctp_handle_stream_reset(stcb, (struct sctp_stream_reset_out_req *)ch)) { 4132 /* stop processing */ 4133 *offset = length; 4134 return (NULL); 4135 } 4136 break; 4137 case SCTP_PACKET_DROPPED: 4138#ifdef SCTP_DEBUG 4139 if (sctp_debug_on & SCTP_DEBUG_INPUT3) { 4140 printf("SCTP_PACKET_DROPPED\n"); 4141 } 4142#endif /* SCTP_DEBUG */ 4143 /* re-get it all please */ 4144 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4145 chk_length, chunk_buf); 4146 4147 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch, 4148 stcb, *netp); 4149 4150 break; 4151 4152 case SCTP_AUTHENTICATION: 4153#ifdef SCTP_DEBUG 4154 if (sctp_debug_on & SCTP_DEBUG_INPUT3) { 4155 printf("SCTP_AUTHENTICATION\n"); 4156 } 4157#endif /* SCTP_DEBUG */ 4158 if (sctp_auth_disable) 4159 goto unknown_chunk; 4160 4161 if (stcb == NULL) { 4162 /* save the first AUTH for later processing */ 4163 if (auth_skipped == 0) { 4164 auth_offset = *offset; 4165 auth_len = chk_length; 4166 auth_skipped = 1; 4167 } 4168 /* skip this chunk (temporarily) */ 4169 goto next_chunk; 4170 } 4171 if (got_auth == 1) { 4172 /* skip this chunk... it's already auth'd */ 4173 goto next_chunk; 4174 } 4175 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4176 chk_length, chunk_buf); 4177 got_auth = 1; 4178 if (sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch, 4179 m, *offset)) { 4180 /* auth HMAC failed so dump the packet */ 4181 *offset = length; 4182 return (stcb); 4183 } else { 4184 /* remaining chunks are HMAC checked */ 4185 stcb->asoc.authenticated = 1; 4186 } 4187 break; 4188 4189 default: 4190 unknown_chunk: 4191 /* it's an unknown chunk! */ 4192 if ((ch->chunk_type & 0x40) && (stcb != NULL)) { 4193 struct mbuf *mm; 4194 struct sctp_paramhdr *phd; 4195 4196 mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 4197 1, M_DONTWAIT, 1, MT_DATA); 4198 if (mm) { 4199 phd = mtod(mm, struct sctp_paramhdr *); 4200 /* 4201 * We cheat and use param type since 4202 * we did not bother to define a 4203 * error cause struct. They are the 4204 * same basic format with different 4205 * names. 4206 */ 4207 phd->param_type = htons(SCTP_CAUSE_UNRECOG_CHUNK); 4208 phd->param_length = htons(chk_length + sizeof(*phd)); 4209 mm->m_len = sizeof(*phd); 4210 mm->m_next = sctp_m_copym(m, *offset, SCTP_SIZE32(chk_length), 4211 M_DONTWAIT); 4212 if (mm->m_next) { 4213 mm->m_pkthdr.len = SCTP_SIZE32(chk_length) + sizeof(*phd); 4214 sctp_queue_op_err(stcb, mm); 4215 } else { 4216 sctp_m_freem(mm); 4217 } 4218 } 4219 } 4220 if ((ch->chunk_type & 0x80) == 0) { 4221 /* discard this packet */ 4222 *offset = length; 4223 return (stcb); 4224 } /* else skip this bad chunk and continue... */ 4225 break; 4226 } /* switch (ch->chunk_type) */ 4227 4228 4229next_chunk: 4230 /* get the next chunk */ 4231 *offset += SCTP_SIZE32(chk_length); 4232 if (*offset >= length) { 4233 /* no more data left in the mbuf chain */ 4234 break; 4235 } 4236 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4237 sizeof(struct sctp_chunkhdr), chunk_buf); 4238 if (ch == NULL) { 4239 if (locked_tcb) 4240 SCTP_TCB_UNLOCK(locked_tcb); 4241 *offset = length; 4242 return (NULL); 4243 } 4244 } /* while */ 4245 return (stcb); 4246} 4247 4248 4249/* 4250 * Process the ECN bits we have something set so we must look to see if it is 4251 * ECN(0) or ECN(1) or CE 4252 */ 4253static __inline void 4254sctp_process_ecn_marked_a(struct sctp_tcb *stcb, struct sctp_nets *net, 4255 uint8_t ecn_bits) 4256{ 4257 if ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS) { 4258 ; 4259 } else if ((ecn_bits & SCTP_ECT1_BIT) == SCTP_ECT1_BIT) { 4260 /* 4261 * we only add to the nonce sum for ECT1, ECT0 does not 4262 * change the NS bit (that we have yet to find a way to send 4263 * it yet). 4264 */ 4265 4266 /* ECN Nonce stuff */ 4267 stcb->asoc.receiver_nonce_sum++; 4268 stcb->asoc.receiver_nonce_sum &= SCTP_SACK_NONCE_SUM; 4269 4270 /* 4271 * Drag up the last_echo point if cumack is larger since we 4272 * don't want the point falling way behind by more than 4273 * 2^^31 and then having it be incorrect. 4274 */ 4275 if (compare_with_wrap(stcb->asoc.cumulative_tsn, 4276 stcb->asoc.last_echo_tsn, MAX_TSN)) { 4277 stcb->asoc.last_echo_tsn = stcb->asoc.cumulative_tsn; 4278 } 4279 } else if ((ecn_bits & SCTP_ECT0_BIT) == SCTP_ECT0_BIT) { 4280 /* 4281 * Drag up the last_echo point if cumack is larger since we 4282 * don't want the point falling way behind by more than 4283 * 2^^31 and then having it be incorrect. 4284 */ 4285 if (compare_with_wrap(stcb->asoc.cumulative_tsn, 4286 stcb->asoc.last_echo_tsn, MAX_TSN)) { 4287 stcb->asoc.last_echo_tsn = stcb->asoc.cumulative_tsn; 4288 } 4289 } 4290} 4291 4292static __inline void 4293sctp_process_ecn_marked_b(struct sctp_tcb *stcb, struct sctp_nets *net, 4294 uint32_t high_tsn, uint8_t ecn_bits) 4295{ 4296 if ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS) { 4297 /* 4298 * we possibly must notify the sender that a congestion 4299 * window reduction is in order. We do this by adding a ECNE 4300 * chunk to the output chunk queue. The incoming CWR will 4301 * remove this chunk. 4302 */ 4303 if (compare_with_wrap(high_tsn, stcb->asoc.last_echo_tsn, 4304 MAX_TSN)) { 4305 /* Yep, we need to add a ECNE */ 4306 sctp_send_ecn_echo(stcb, net, high_tsn); 4307 stcb->asoc.last_echo_tsn = high_tsn; 4308 } 4309 } 4310} 4311 4312/* 4313 * common input chunk processing (v4 and v6) 4314 */ 4315int 4316sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, 4317 int length, struct sctphdr *sh, struct sctp_chunkhdr *ch, 4318 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets *net, 4319 uint8_t ecn_bits) 4320{ 4321 /* 4322 * Control chunk processing 4323 */ 4324 uint32_t high_tsn; 4325 int fwd_tsn_seen = 0, data_processed = 0; 4326 struct mbuf *m = *mm; 4327 int abort_flag = 0; 4328 int un_sent; 4329 4330 SCTP_STAT_INCR(sctps_recvdatagrams); 4331#ifdef SCTP_AUDITING_ENABLED 4332 sctp_audit_log(0xE0, 1); 4333 sctp_auditing(0, inp, stcb, net); 4334#endif 4335 4336#ifdef SCTP_DEBUG 4337 if (sctp_debug_on & SCTP_DEBUG_INPUT1) { 4338 printf("Ok, Common input processing called, m:%p iphlen:%d offset:%d\n", 4339 m, iphlen, offset); 4340 } 4341#endif /* SCTP_DEBUG */ 4342 4343 if (stcb) { 4344 /* always clear this before beginning a packet */ 4345 stcb->asoc.authenticated = 0; 4346 stcb->asoc.seen_a_sack_this_pkt = 0; 4347 } 4348 if (IS_SCTP_CONTROL(ch)) { 4349 /* process the control portion of the SCTP packet */ 4350 stcb = sctp_process_control(m, iphlen, &offset, length, sh, ch, 4351 inp, stcb, &net, &fwd_tsn_seen); 4352 if (stcb) { 4353 /* 4354 * This covers us if the cookie-echo was there and 4355 * it changes our INP. 4356 */ 4357 inp = stcb->sctp_ep; 4358 } 4359 } else { 4360 /* 4361 * no control chunks, so pre-process DATA chunks (these 4362 * checks are taken care of by control processing) 4363 */ 4364 4365 /* 4366 * if DATA only packet, and auth is required, then punt... 4367 * can't have authenticated without any AUTH (control) 4368 * chunks 4369 */ 4370 if ((stcb != NULL) && !sctp_auth_disable && 4371 sctp_auth_is_required_chunk(SCTP_DATA, 4372 stcb->asoc.local_auth_chunks)) { 4373 /* "silently" ignore */ 4374 SCTP_STAT_INCR(sctps_recvauthmissing); 4375 SCTP_TCB_UNLOCK(stcb); 4376 return (1); 4377 } 4378 if (stcb == NULL) { 4379 /* out of the blue DATA chunk */ 4380 sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL); 4381 return (1); 4382 } 4383 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) { 4384 /* v_tag mismatch! */ 4385 SCTP_STAT_INCR(sctps_badvtag); 4386 SCTP_TCB_UNLOCK(stcb); 4387 return (1); 4388 } 4389 } 4390 4391 if (stcb == NULL) { 4392 /* 4393 * no valid TCB for this packet, or we found it's a bad 4394 * packet while processing control, or we're done with this 4395 * packet (done or skip rest of data), so we drop it... 4396 */ 4397 return (1); 4398 } 4399 /* 4400 * DATA chunk processing 4401 */ 4402 /* plow through the data chunks while length > offset */ 4403 4404 /* 4405 * Rest should be DATA only. Check authentication state if AUTH for 4406 * DATA is required. 4407 */ 4408 if ((stcb != NULL) && !sctp_auth_disable && 4409 sctp_auth_is_required_chunk(SCTP_DATA, 4410 stcb->asoc.local_auth_chunks) && 4411 !stcb->asoc.authenticated) { 4412 /* "silently" ignore */ 4413 SCTP_STAT_INCR(sctps_recvauthmissing); 4414#ifdef SCTP_DEBUG 4415 if (sctp_debug_on & SCTP_DEBUG_AUTH1) 4416 printf("Data chunk requires AUTH, skipped\n"); 4417#endif 4418 SCTP_TCB_UNLOCK(stcb); 4419 return (1); 4420 } 4421 if (length > offset) { 4422 int retval; 4423 4424 /* 4425 * First check to make sure our state is correct. We would 4426 * not get here unless we really did have a tag, so we don't 4427 * abort if this happens, just dump the chunk silently. 4428 */ 4429 switch (SCTP_GET_STATE(&stcb->asoc)) { 4430 case SCTP_STATE_COOKIE_ECHOED: 4431 /* 4432 * we consider data with valid tags in this state 4433 * shows us the cookie-ack was lost. Imply it was 4434 * there. 4435 */ 4436 stcb->asoc.overall_error_count = 0; 4437 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net); 4438 break; 4439 case SCTP_STATE_COOKIE_WAIT: 4440 /* 4441 * We consider OOTB any data sent during asoc setup. 4442 */ 4443 sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL); 4444 SCTP_TCB_UNLOCK(stcb); 4445 return (1); 4446 break; 4447 case SCTP_STATE_EMPTY: /* should not happen */ 4448 case SCTP_STATE_INUSE: /* should not happen */ 4449 case SCTP_STATE_SHUTDOWN_RECEIVED: /* This is a peer error */ 4450 case SCTP_STATE_SHUTDOWN_ACK_SENT: 4451 default: 4452 SCTP_TCB_UNLOCK(stcb); 4453 return (1); 4454 break; 4455 case SCTP_STATE_OPEN: 4456 case SCTP_STATE_SHUTDOWN_SENT: 4457 break; 4458 } 4459 /* take care of ECN, part 1. */ 4460 if (stcb->asoc.ecn_allowed && 4461 (ecn_bits & (SCTP_ECT0_BIT | SCTP_ECT1_BIT))) { 4462 sctp_process_ecn_marked_a(stcb, net, ecn_bits); 4463 } 4464 /* plow through the data chunks while length > offset */ 4465 retval = sctp_process_data(mm, iphlen, &offset, length, sh, 4466 inp, stcb, net, &high_tsn); 4467 if (retval == 2) { 4468 /* 4469 * The association aborted, NO UNLOCK needed since 4470 * the association is destroyed. 4471 */ 4472 return (0); 4473 } 4474 data_processed = 1; 4475 if (retval == 0) { 4476 /* take care of ecn part 2. */ 4477 if (stcb->asoc.ecn_allowed && 4478 (ecn_bits & (SCTP_ECT0_BIT | SCTP_ECT1_BIT))) { 4479 sctp_process_ecn_marked_b(stcb, net, high_tsn, 4480 ecn_bits); 4481 } 4482 } 4483 /* 4484 * Anything important needs to have been m_copy'ed in 4485 * process_data 4486 */ 4487 } 4488 if ((data_processed == 0) && (fwd_tsn_seen)) { 4489 int was_a_gap = 0; 4490 4491 if (compare_with_wrap(stcb->asoc.highest_tsn_inside_map, 4492 stcb->asoc.cumulative_tsn, MAX_TSN)) { 4493 /* there was a gap before this data was processed */ 4494 was_a_gap = 1; 4495 } 4496 sctp_sack_check(stcb, 1, was_a_gap, &abort_flag); 4497 if (abort_flag) { 4498 /* Again, we aborted so NO UNLOCK needed */ 4499 return (0); 4500 } 4501 } 4502 /* trigger send of any chunks in queue... */ 4503#ifdef SCTP_AUDITING_ENABLED 4504 sctp_audit_log(0xE0, 2); 4505 sctp_auditing(1, inp, stcb, net); 4506#endif 4507#ifdef SCTP_DEBUG 4508 if (sctp_debug_on & SCTP_DEBUG_INPUT1) { 4509 printf("Check for chunk output prw:%d tqe:%d tf=%d\n", 4510 stcb->asoc.peers_rwnd, 4511 TAILQ_EMPTY(&stcb->asoc.control_send_queue), 4512 stcb->asoc.total_flight); 4513 } 4514#endif 4515 un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight); 4516 4517 if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue) || 4518 ((un_sent) && 4519 (stcb->asoc.peers_rwnd > 0 || 4520 (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) { 4521#ifdef SCTP_DEBUG 4522 if (sctp_debug_on & SCTP_DEBUG_INPUT3) { 4523 printf("Calling chunk OUTPUT\n"); 4524 } 4525#endif 4526 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC); 4527#ifdef SCTP_DEBUG 4528 if (sctp_debug_on & SCTP_DEBUG_INPUT3) { 4529 printf("chunk OUTPUT returns\n"); 4530 } 4531#endif 4532 } 4533#ifdef SCTP_AUDITING_ENABLED 4534 sctp_audit_log(0xE0, 3); 4535 sctp_auditing(2, inp, stcb, net); 4536#endif 4537 SCTP_TCB_UNLOCK(stcb); 4538 return (0); 4539} 4540 4541extern int sctp_no_csum_on_loopback; 4542 4543 4544void 4545sctp_input(m, off) 4546 struct mbuf *m; 4547 int off; 4548 4549{ 4550#ifdef SCTP_MBUF_LOGGING 4551 struct mbuf *mat; 4552 4553#endif 4554 int iphlen; 4555 int s; 4556 uint8_t ecn_bits; 4557 struct ip *ip; 4558 struct sctphdr *sh; 4559 struct sctp_inpcb *inp = NULL; 4560 4561 uint32_t check, calc_check; 4562 struct sctp_nets *net; 4563 struct sctp_tcb *stcb = NULL; 4564 struct sctp_chunkhdr *ch; 4565 int refcount_up = 0; 4566 int length, mlen, offset; 4567 4568 4569 iphlen = off; 4570 net = NULL; 4571 SCTP_STAT_INCR(sctps_recvpackets); 4572 SCTP_STAT_INCR_COUNTER64(sctps_inpackets); 4573 4574 /* 4575 * Strip IP options, we don't allow any in or out. 4576 */ 4577#ifdef SCTP_MBUF_LOGGING 4578 /* Log in any input mbufs */ 4579 mat = m; 4580 while (mat) { 4581 if (mat->m_flags & M_EXT) { 4582 sctp_log_mb(mat, SCTP_MBUF_INPUT); 4583 } 4584 mat = mat->m_next; 4585 } 4586#endif 4587 if ((size_t)iphlen > sizeof(struct ip)) { 4588 ip_stripoptions(m, (struct mbuf *)0); 4589 iphlen = sizeof(struct ip); 4590 } 4591 /* 4592 * Get IP, SCTP, and first chunk header together in first mbuf. 4593 */ 4594 ip = mtod(m, struct ip *); 4595 offset = iphlen + sizeof(*sh) + sizeof(*ch); 4596 if (m->m_len < offset) { 4597 if ((m = m_pullup(m, offset)) == 0) { 4598 SCTP_STAT_INCR(sctps_hdrops); 4599 return; 4600 } 4601 ip = mtod(m, struct ip *); 4602 } 4603 sh = (struct sctphdr *)((caddr_t)ip + iphlen); 4604 ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(*sh)); 4605 4606 /* SCTP does not allow broadcasts or multicasts */ 4607 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) { 4608 goto bad; 4609 } 4610 if (((ch->chunk_type == SCTP_INITIATION) || 4611 (ch->chunk_type == SCTP_INITIATION_ACK) || 4612 (ch->chunk_type == SCTP_COOKIE_ECHO)) && 4613 (in_broadcast(ip->ip_dst, m->m_pkthdr.rcvif))) { 4614 /* 4615 * We only look at broadcast if its a front state, All 4616 * others we will not have a tcb for anyway. 4617 */ 4618 goto bad; 4619 } 4620 /* destination port of 0 is illegal, based on RFC2960. */ 4621 if (sh->dest_port == 0) { 4622 SCTP_STAT_INCR(sctps_hdrops); 4623 goto bad; 4624 } 4625 /* validate SCTP checksum */ 4626 if ((sctp_no_csum_on_loopback == 0) || 4627 (m->m_pkthdr.rcvif == NULL) || 4628 (m->m_pkthdr.rcvif->if_type != IFT_LOOP)) { 4629 /* 4630 * we do NOT validate things from the loopback if the sysctl 4631 * is set to 1. 4632 */ 4633 check = sh->checksum; /* save incoming checksum */ 4634 if ((check == 0) && (sctp_no_csum_on_loopback)) { 4635 /* 4636 * special hook for where we got a local address 4637 * somehow routed across a non IFT_LOOP type 4638 * interface 4639 */ 4640 if (ip->ip_src.s_addr == ip->ip_dst.s_addr) 4641 goto sctp_skip_csum_4; 4642 } 4643 sh->checksum = 0; /* prepare for calc */ 4644 calc_check = sctp_calculate_sum(m, &mlen, iphlen); 4645 if (calc_check != check) { 4646#ifdef SCTP_DEBUG 4647 if (sctp_debug_on & SCTP_DEBUG_INPUT1) { 4648 printf("Bad CSUM on SCTP packet calc_check:%x check:%x m:%p mlen:%d iphlen:%d\n", 4649 calc_check, check, m, mlen, iphlen); 4650 } 4651#endif 4652 4653 stcb = sctp_findassociation_addr(m, iphlen, 4654 offset - sizeof(*ch), 4655 sh, ch, &inp, &net); 4656 if ((inp) && (stcb)) { 4657 sctp_send_packet_dropped(stcb, net, m, iphlen, 1); 4658 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR); 4659 } else if ((inp != NULL) && (stcb == NULL)) { 4660 refcount_up = 1; 4661 } 4662 SCTP_STAT_INCR(sctps_badsum); 4663 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors); 4664 goto bad; 4665 } 4666 sh->checksum = calc_check; 4667 } else { 4668sctp_skip_csum_4: 4669 mlen = m->m_pkthdr.len; 4670 } 4671 /* validate mbuf chain length with IP payload length */ 4672 if (mlen < (ip->ip_len - iphlen)) { 4673 SCTP_STAT_INCR(sctps_hdrops); 4674 goto bad; 4675 } 4676 /* 4677 * Locate pcb and tcb for datagram sctp_findassociation_addr() wants 4678 * IP/SCTP/first chunk header... 4679 */ 4680 stcb = sctp_findassociation_addr(m, iphlen, offset - sizeof(*ch), 4681 sh, ch, &inp, &net); 4682 /* inp's ref-count increased && stcb locked */ 4683 if (inp == NULL) { 4684 struct sctp_init_chunk *init_chk, chunk_buf; 4685 4686 SCTP_STAT_INCR(sctps_noport); 4687#ifdef ICMP_BANDLIM 4688 /* 4689 * we use the bandwidth limiting to protect against sending 4690 * too many ABORTS all at once. In this case these count the 4691 * same as an ICMP message. 4692 */ 4693 if (badport_bandlim(0) < 0) 4694 goto bad; 4695#endif /* ICMP_BANDLIM */ 4696#ifdef SCTP_DEBUG 4697 if (sctp_debug_on & SCTP_DEBUG_INPUT1) { 4698 printf("Sending a ABORT from packet entry!\n"); 4699 } 4700#endif 4701 if (ch->chunk_type == SCTP_INITIATION) { 4702 /* 4703 * we do a trick here to get the INIT tag, dig in 4704 * and get the tag from the INIT and put it in the 4705 * common header. 4706 */ 4707 init_chk = (struct sctp_init_chunk *)sctp_m_getptr(m, 4708 iphlen + sizeof(*sh), sizeof(*init_chk), 4709 (uint8_t *) & chunk_buf); 4710 if (init_chk != NULL) 4711 sh->v_tag = init_chk->init.initiate_tag; 4712 } 4713 sctp_send_abort(m, iphlen, sh, 0, NULL); 4714 goto bad; 4715 } else if (stcb == NULL) { 4716 refcount_up = 1; 4717 } 4718#ifdef IPSEC 4719 /* 4720 * I very much doubt any of the IPSEC stuff will work but I have no 4721 * idea, so I will leave it in place. 4722 */ 4723 4724 if (inp && ipsec4_in_reject(m, &inp->ip_inp.inp)) { 4725 ipsecstat.in_polvio++; 4726 SCTP_STAT_INCR(sctps_hdrops); 4727 goto bad; 4728 } 4729#endif /* IPSEC */ 4730 4731 4732 4733 /* 4734 * common chunk processing 4735 */ 4736 length = ip->ip_len + iphlen; 4737 offset -= sizeof(struct sctp_chunkhdr); 4738 4739 ecn_bits = ip->ip_tos; 4740 s = splnet(); 4741 4742 sctp_common_input_processing(&m, iphlen, offset, length, sh, ch, 4743 inp, stcb, net, ecn_bits); 4744 /* inp's ref-count reduced && stcb unlocked */ 4745 splx(s); 4746 if (m) { 4747 sctp_m_freem(m); 4748 } 4749 if ((inp) && (refcount_up)) { 4750 /* reduce ref-count */ 4751 SCTP_INP_WLOCK(inp); 4752 SCTP_INP_DECR_REF(inp); 4753 SCTP_INP_WUNLOCK(inp); 4754 } 4755 return; 4756bad: 4757 if (stcb) 4758 SCTP_TCB_UNLOCK(stcb); 4759 4760 if ((inp) && (refcount_up)) { 4761 /* reduce ref-count */ 4762 SCTP_INP_WLOCK(inp); 4763 SCTP_INP_DECR_REF(inp); 4764 SCTP_INP_WUNLOCK(inp); 4765 } 4766 if (m) { 4767 sctp_m_freem(m); 4768 } 4769 return; 4770} 4771