sys/netinet/sctp_input.c

   1 /*-
   2  * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved.
   3  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
   4  * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions are met:
   8  *
   9  * a) Redistributions of source code must retain the above copyright notice,
  10  *    this list of conditions and the following disclaimer.
  11  *
  12  * b) Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in
  14  *    the documentation and/or other materials provided with the distribution.
  15  *
  16  * c) Neither the name of Cisco Systems, Inc. nor the names of its
  17  *    contributors may be used to endorse or promote products derived
  18  *    from this software without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  21  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  22  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  24  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  30  * THE POSSIBILITY OF SUCH DAMAGE.
  31  */
  32
  33 #include <sys/cdefs.h>
  34 __FBSDID("$FreeBSD$");
  35
  36 #include <netinet/sctp_os.h>
  37 #include <netinet/sctp_var.h>
  38 #include <netinet/sctp_sysctl.h>
  39 #include <netinet/sctp_pcb.h>
  40 #include <netinet/sctp_header.h>
  41 #include <netinet/sctputil.h>
  42 #include <netinet/sctp_output.h>
  43 #include <netinet/sctp_input.h>
  44 #include <netinet/sctp_auth.h>
  45 #include <netinet/sctp_indata.h>
  46 #include <netinet/sctp_asconf.h>
  47 #include <netinet/sctp_bsd_addr.h>
  48 #include <netinet/sctp_timer.h>
  49 #include <netinet/sctp_crc32.h>
  50 #include <netinet/udp.h>
  51 #include <sys/smp.h>
  52
  53
  54
  55 static void
  56 sctp_stop_all_cookie_timers(struct sctp_tcb *stcb)
  57 {
  58         struct sctp_nets *net;
  59
  60         /*
  61          * This now not only stops all cookie timers it also stops any INIT
  62          * timers as well. This will make sure that the timers are stopped
  63          * in all collision cases.
  64          */
  65         SCTP_TCB_LOCK_ASSERT(stcb);
  66         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
  67                 if (net->rxt_timer.type == SCTP_TIMER_TYPE_COOKIE) {
  68                         sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE,
  69                             stcb->sctp_ep,
  70                             stcb,
  71                             net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_1);
  72                 } else if (net->rxt_timer.type == SCTP_TIMER_TYPE_INIT) {
  73                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT,
  74                             stcb->sctp_ep,
  75                             stcb,
  76                             net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_2);
  77                 }
  78         }
  79 }
  80
  81 /* INIT handler */
  82 static void
  83 sctp_handle_init(struct mbuf *m, int iphlen, int offset, struct sctphdr *sh,
  84     struct sctp_init_chunk *cp, struct sctp_inpcb *inp, struct sctp_tcb *stcb,
  85     int *abort_no_unlock, uint32_t vrf_id, uint16_t port)
  86 {
  87         struct sctp_init *init;
  88         struct mbuf *op_err;
  89
  90         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_init: handling INIT tcb:%p\n",
  91             stcb);
  92         if (stcb == NULL) {
  93                 SCTP_INP_RLOCK(inp);
  94         }
  95         /* validate length */
  96         if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_chunk)) {
  97                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
  98                 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err,
  99                     vrf_id, port);
 100                 if (stcb)
 101                         *abort_no_unlock = 1;
 102                 goto outnow;
 103         }
 104         /* validate parameters */
 105         init = &cp->init;
 106         if (init->initiate_tag == 0) {
 107                 /* protocol error... send abort */
 108                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
 109                 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err,
 110                     vrf_id, port);
 111                 if (stcb)
 112                         *abort_no_unlock = 1;
 113                 goto outnow;
 114         }
 115         if (ntohl(init->a_rwnd) < SCTP_MIN_RWND) {
 116                 /* invalid parameter... send abort */
 117                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
 118                 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err,
 119                     vrf_id, port);
 120                 if (stcb)
 121                         *abort_no_unlock = 1;
 122                 goto outnow;
 123         }
 124         if (init->num_inbound_streams == 0) {
 125                 /* protocol error... send abort */
 126                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
 127                 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err,
 128                     vrf_id, port);
 129                 if (stcb)
 130                         *abort_no_unlock = 1;
 131                 goto outnow;
 132         }
 133         if (init->num_outbound_streams == 0) {
 134                 /* protocol error... send abort */
 135                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
 136                 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err,
 137                     vrf_id, port);
 138                 if (stcb)
 139                         *abort_no_unlock = 1;
 140                 goto outnow;
 141         }
 142         if (sctp_validate_init_auth_params(m, offset + sizeof(*cp),
 143             offset + ntohs(cp->ch.chunk_length))) {
 144                 /* auth parameter(s) error... send abort */
 145                 sctp_abort_association(inp, stcb, m, iphlen, sh, NULL, vrf_id, port);
 146                 if (stcb)
 147                         *abort_no_unlock = 1;
 148                 goto outnow;
 149         }
 150         /*
 151          * We are only accepting if we have a socket with positive
 152          * so_qlimit.
 153          */
 154         if ((stcb == NULL) &&
 155             ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
 156             (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) ||
 157             (inp->sctp_socket == NULL) ||
 158             (inp->sctp_socket->so_qlimit == 0))) {
 159                 /*
 160                  * FIX ME ?? What about TCP model and we have a
 161                  * match/restart case? Actually no fix is needed. the lookup
 162                  * will always find the existing assoc so stcb would not be
 163                  * NULL. It may be questionable to do this since we COULD
 164                  * just send back the INIT-ACK and hope that the app did
 165                  * accept()'s by the time the COOKIE was sent. But there is
 166                  * a price to pay for COOKIE generation and I don't want to
 167                  * pay it on the chance that the app will actually do some
 168                  * accepts(). The App just looses and should NOT be in this
 169                  * state :-)
 170                  */
 171                 if (SCTP_BASE_SYSCTL(sctp_blackhole) == 0) {
 172                         sctp_send_abort(m, iphlen, sh, 0, NULL, vrf_id, port);
 173                 }
 174                 goto outnow;
 175         }
 176         if ((stcb != NULL) &&
 177             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT)) {
 178                 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending SHUTDOWN-ACK\n");
 179                 sctp_send_shutdown_ack(stcb, NULL);
 180                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
 181         } else {
 182                 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n");
 183                 sctp_send_initiate_ack(inp, stcb, m, iphlen, offset, sh, cp, vrf_id, port,
 184                     ((stcb == NULL) ? SCTP_HOLDS_LOCK : SCTP_NOT_LOCKED));
 185         }
 186 outnow:
 187         if (stcb == NULL) {
 188                 SCTP_INP_RUNLOCK(inp);
 189         }
 190 }
 191
 192 /*
 193  * process peer "INIT/INIT-ACK" chunk returns value < 0 on error
 194  */
 195
 196 int
 197 sctp_is_there_unsent_data(struct sctp_tcb *stcb, int so_locked
 198 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
 199     SCTP_UNUSED
 200 #endif
 201 )
 202 {
 203         int unsent_data = 0;
 204         unsigned int i;
 205         struct sctp_stream_queue_pending *sp;
 206         struct sctp_association *asoc;
 207
 208         /*
 209          * This function returns the number of streams that have true unsent
 210          * data on them. Note that as it looks through it will clean up any
 211          * places that have old data that has been sent but left at top of
 212          * stream queue.
 213          */
 214         asoc = &stcb->asoc;
 215         SCTP_TCB_SEND_LOCK(stcb);
 216         if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
 217                 /* Check to see if some data queued */
 218                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
 219                         /* sa_ignore FREED_MEMORY */
 220                         sp = TAILQ_FIRST(&stcb->asoc.strmout[i].outqueue);
 221                         if (sp == NULL) {
 222                                 continue;
 223                         }
 224                         if ((sp->msg_is_complete) &&
 225                             (sp->length == 0) &&
 226                             (sp->sender_all_done)) {
 227                                 /*
 228                                  * We are doing differed cleanup. Last time
 229                                  * through when we took all the data the
 230                                  * sender_all_done was not set.
 231                                  */
 232                                 if (sp->put_last_out == 0) {
 233                                         SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
 234                                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n",
 235                                             sp->sender_all_done,
 236                                             sp->length,
 237                                             sp->msg_is_complete,
 238                                             sp->put_last_out);
 239                                 }
 240                                 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1);
 241                                 TAILQ_REMOVE(&stcb->asoc.strmout[i].outqueue, sp, next);
 242                                 if (sp->net) {
 243                                         sctp_free_remote_addr(sp->net);
 244                                         sp->net = NULL;
 245                                 }
 246                                 if (sp->data) {
 247                                         sctp_m_freem(sp->data);
 248                                         sp->data = NULL;
 249                                 }
 250                                 sctp_free_a_strmoq(stcb, sp, so_locked);
 251                         } else {
 252                                 unsent_data++;
 253                                 break;
 254                         }
 255                 }
 256         }
 257         SCTP_TCB_SEND_UNLOCK(stcb);
 258         return (unsent_data);
 259 }
 260
 261 static int
 262 sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb)
 263 {
 264         struct sctp_init *init;
 265         struct sctp_association *asoc;
 266         struct sctp_nets *lnet;
 267         unsigned int i;
 268
 269         init = &cp->init;
 270         asoc = &stcb->asoc;
 271         /* save off parameters */
 272         asoc->peer_vtag = ntohl(init->initiate_tag);
 273         asoc->peers_rwnd = ntohl(init->a_rwnd);
 274         /* init tsn's */
 275         asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1;
 276
 277         if (!TAILQ_EMPTY(&asoc->nets)) {
 278                 /* update any ssthresh's that may have a default */
 279                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
 280                         lnet->ssthresh = asoc->peers_rwnd;
 281                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) {
 282                                 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION);
 283                         }
 284                 }
 285         }
 286         SCTP_TCB_SEND_LOCK(stcb);
 287         if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) {
 288                 unsigned int newcnt;
 289                 struct sctp_stream_out *outs;
 290                 struct sctp_stream_queue_pending *sp, *nsp;
 291                 struct sctp_tmit_chunk *chk, *nchk;
 292
 293                 /* abandon the upper streams */
 294                 newcnt = ntohs(init->num_inbound_streams);
 295                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
 296                         if (chk->rec.data.stream_number >= newcnt) {
 297                                 TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next);
 298                                 asoc->send_queue_cnt--;
 299                                 if (chk->data != NULL) {
 300                                         sctp_free_bufspace(stcb, asoc, chk, 1);
 301                                         sctp_ulp_notify(SCTP_NOTIFY_UNSENT_DG_FAIL, stcb,
 302                                             0, chk, SCTP_SO_NOT_LOCKED);
 303                                         if (chk->data) {
 304                                                 sctp_m_freem(chk->data);
 305                                                 chk->data = NULL;
 306                                         }
 307                                 }
 308                                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
 309                                 /* sa_ignore FREED_MEMORY */
 310                         }
 311                 }
 312                 if (asoc->strmout) {
 313                         for (i = newcnt; i < asoc->pre_open_streams; i++) {
 314                                 outs = &asoc->strmout[i];
 315                                 TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) {
 316                                         TAILQ_REMOVE(&outs->outqueue, sp, next);
 317                                         asoc->stream_queue_cnt--;
 318                                         sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL,
 319                                             stcb, 0, sp, SCTP_SO_NOT_LOCKED);
 320                                         if (sp->data) {
 321                                                 sctp_m_freem(sp->data);
 322                                                 sp->data = NULL;
 323                                         }
 324                                         if (sp->net) {
 325                                                 sctp_free_remote_addr(sp->net);
 326                                                 sp->net = NULL;
 327                                         }
 328                                         /* Free the chunk */
 329                                         sctp_free_a_strmoq(stcb, sp, SCTP_SO_NOT_LOCKED);
 330                                         /* sa_ignore FREED_MEMORY */
 331                                 }
 332                         }
 333                 }
 334                 /* cut back the count */
 335                 asoc->pre_open_streams = newcnt;
 336         }
 337         SCTP_TCB_SEND_UNLOCK(stcb);
 338         asoc->strm_realoutsize = asoc->streamoutcnt = asoc->pre_open_streams;
 339
 340         /* EY - nr_sack: initialize highest tsn in nr_mapping_array */
 341         asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
 342         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
 343                 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
 344         }
 345         /* This is the next one we expect */
 346         asoc->str_reset_seq_in = asoc->asconf_seq_in + 1;
 347
 348         asoc->mapping_array_base_tsn = ntohl(init->initial_tsn);
 349         asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in;
 350
 351         asoc->advanced_peer_ack_point = asoc->last_acked_seq;
 352         /* open the requested streams */
 353
 354         if (asoc->strmin != NULL) {
 355                 /* Free the old ones */
 356                 struct sctp_queued_to_read *ctl, *nctl;
 357
 358                 for (i = 0; i < asoc->streamincnt; i++) {
 359                         TAILQ_FOREACH_SAFE(ctl, &asoc->strmin[i].inqueue, next, nctl) {
 360                                 TAILQ_REMOVE(&asoc->strmin[i].inqueue, ctl, next);
 361                                 sctp_free_remote_addr(ctl->whoFrom);
 362                                 ctl->whoFrom = NULL;
 363                                 sctp_m_freem(ctl->data);
 364                                 ctl->data = NULL;
 365                                 sctp_free_a_readq(stcb, ctl);
 366                         }
 367                 }
 368                 SCTP_FREE(asoc->strmin, SCTP_M_STRMI);
 369         }
 370         asoc->streamincnt = ntohs(init->num_outbound_streams);
 371         if (asoc->streamincnt > MAX_SCTP_STREAMS) {
 372                 asoc->streamincnt = MAX_SCTP_STREAMS;
 373         }
 374         SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt *
 375             sizeof(struct sctp_stream_in), SCTP_M_STRMI);
 376         if (asoc->strmin == NULL) {
 377                 /* we didn't get memory for the streams! */
 378                 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n");
 379                 return (-1);
 380         }
 381         for (i = 0; i < asoc->streamincnt; i++) {
 382                 asoc->strmin[i].stream_no = i;
 383                 asoc->strmin[i].last_sequence_delivered = 0xffff;
 384                 /*
 385                  * U-stream ranges will be set when the cookie is unpacked.
 386                  * Or for the INIT sender they are un set (if pr-sctp not
 387                  * supported) when the INIT-ACK arrives.
 388                  */
 389                 TAILQ_INIT(&asoc->strmin[i].inqueue);
 390                 asoc->strmin[i].delivery_started = 0;
 391         }
 392         /*
 393          * load_address_from_init will put the addresses into the
 394          * association when the COOKIE is processed or the INIT-ACK is
 395          * processed. Both types of COOKIE's existing and new call this
 396          * routine. It will remove addresses that are no longer in the
 397          * association (for the restarting case where addresses are
 398          * removed). Up front when the INIT arrives we will discard it if it
 399          * is a restart and new addresses have been added.
 400          */
 401         /* sa_ignore MEMLEAK */
 402         return (0);
 403 }
 404
 405 /*
 406  * INIT-ACK message processing/consumption returns value < 0 on error
 407  */
 408 static int
 409 sctp_process_init_ack(struct mbuf *m, int iphlen, int offset,
 410     struct sctphdr *sh, struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
 411     struct sctp_nets *net, int *abort_no_unlock, uint32_t vrf_id)
 412 {
 413         struct sctp_association *asoc;
 414         struct mbuf *op_err;
 415         int retval, abort_flag;
 416         uint32_t initack_limit;
 417         int nat_friendly = 0;
 418
 419         /* First verify that we have no illegal param's */
 420         abort_flag = 0;
 421         op_err = NULL;
 422
 423         op_err = sctp_arethere_unrecognized_parameters(m,
 424             (offset + sizeof(struct sctp_init_chunk)),
 425             &abort_flag, (struct sctp_chunkhdr *)cp, &nat_friendly);
 426         if (abort_flag) {
 427                 /* Send an abort and notify peer */
 428                 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
 429                 *abort_no_unlock = 1;
 430                 return (-1);
 431         }
 432         asoc = &stcb->asoc;
 433         asoc->peer_supports_nat = (uint8_t) nat_friendly;
 434         /* process the peer's parameters in the INIT-ACK */
 435         retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb);
 436         if (retval < 0) {
 437                 return (retval);
 438         }
 439         initack_limit = offset + ntohs(cp->ch.chunk_length);
 440         /* load all addresses */
 441         if ((retval = sctp_load_addresses_from_init(stcb, m,
 442             (offset + sizeof(struct sctp_init_chunk)), initack_limit, sh,
 443             NULL))) {
 444                 /* Huh, we should abort */
 445                 SCTPDBG(SCTP_DEBUG_INPUT1,
 446                     "Load addresses from INIT causes an abort %d\n",
 447                     retval);
 448                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh,
 449                     NULL, 0, net->port);
 450                 *abort_no_unlock = 1;
 451                 return (-1);
 452         }
 453         /* if the peer doesn't support asconf, flush the asconf queue */
 454         if (asoc->peer_supports_asconf == 0) {
 455                 struct sctp_asconf_addr *param, *nparam;
 456
 457                 TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) {
 458                         TAILQ_REMOVE(&asoc->asconf_queue, param, next);
 459                         SCTP_FREE(param, SCTP_M_ASC_ADDR);
 460                 }
 461         }
 462         stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs,
 463             stcb->asoc.local_hmacs);
 464         if (op_err) {
 465                 sctp_queue_op_err(stcb, op_err);
 466                 /* queuing will steal away the mbuf chain to the out queue */
 467                 op_err = NULL;
 468         }
 469         /* extract the cookie and queue it to "echo" it back... */
 470         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 471                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
 472                     stcb->asoc.overall_error_count,
 473                     0,
 474                     SCTP_FROM_SCTP_INPUT,
 475                     __LINE__);
 476         }
 477         stcb->asoc.overall_error_count = 0;
 478         net->error_count = 0;
 479
 480         /*
 481          * Cancel the INIT timer, We do this first before queueing the
 482          * cookie. We always cancel at the primary to assue that we are
 483          * canceling the timer started by the INIT which always goes to the
 484          * primary.
 485          */
 486         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb,
 487             asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4);
 488
 489         /* calculate the RTO */
 490         net->RTO = sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, sctp_align_safe_nocopy,
 491             SCTP_RTT_FROM_NON_DATA);
 492
 493         retval = sctp_send_cookie_echo(m, offset, stcb, net);
 494         if (retval < 0) {
 495                 /*
 496                  * No cookie, we probably should send a op error. But in any
 497                  * case if there is no cookie in the INIT-ACK, we can
 498                  * abandon the peer, its broke.
 499                  */
 500                 if (retval == -3) {
 501                         /* We abort with an error of missing mandatory param */
 502                         op_err =
 503                             sctp_generate_invmanparam(SCTP_CAUSE_MISSING_PARAM);
 504                         if (op_err) {
 505                                 /*
 506                                  * Expand beyond to include the mandatory
 507                                  * param cookie
 508                                  */
 509                                 struct sctp_inv_mandatory_param *mp;
 510
 511                                 SCTP_BUF_LEN(op_err) =
 512                                     sizeof(struct sctp_inv_mandatory_param);
 513                                 mp = mtod(op_err,
 514                                     struct sctp_inv_mandatory_param *);
 515                                 /* Subtract the reserved param */
 516                                 mp->length =
 517                                     htons(sizeof(struct sctp_inv_mandatory_param) - 2);
 518                                 mp->num_param = htonl(1);
 519                                 mp->param = htons(SCTP_STATE_COOKIE);
 520                                 mp->resv = 0;
 521                         }
 522                         sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
 523                             sh, op_err, vrf_id, net->port);
 524                         *abort_no_unlock = 1;
 525                 }
 526                 return (retval);
 527         }
 528         return (0);
 529 }
 530
 531 static void
 532 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp,
 533     struct sctp_tcb *stcb, struct sctp_nets *net)
 534 {
 535         struct sockaddr_storage store;
 536         struct sctp_nets *r_net, *f_net;
 537         struct timeval tv;
 538         int req_prim = 0;
 539         uint16_t old_error_counter;
 540
 541 #ifdef INET
 542         struct sockaddr_in *sin;
 543
 544 #endif
 545 #ifdef INET6
 546         struct sockaddr_in6 *sin6;
 547
 548 #endif
 549
 550         if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) {
 551                 /* Invalid length */
 552                 return;
 553         }
 554         memset(&store, 0, sizeof(store));
 555         switch (cp->heartbeat.hb_info.addr_family) {
 556 #ifdef INET
 557         case AF_INET:
 558                 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) {
 559                         sin = (struct sockaddr_in *)&store;
 560                         sin->sin_family = cp->heartbeat.hb_info.addr_family;
 561                         sin->sin_len = cp->heartbeat.hb_info.addr_len;
 562                         sin->sin_port = stcb->rport;
 563                         memcpy(&sin->sin_addr, cp->heartbeat.hb_info.address,
 564                             sizeof(sin->sin_addr));
 565                 } else {
 566                         return;
 567                 }
 568                 break;
 569 #endif
 570 #ifdef INET6
 571         case AF_INET6:
 572                 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) {
 573                         sin6 = (struct sockaddr_in6 *)&store;
 574                         sin6->sin6_family = cp->heartbeat.hb_info.addr_family;
 575                         sin6->sin6_len = cp->heartbeat.hb_info.addr_len;
 576                         sin6->sin6_port = stcb->rport;
 577                         memcpy(&sin6->sin6_addr, cp->heartbeat.hb_info.address,
 578                             sizeof(sin6->sin6_addr));
 579                 } else {
 580                         return;
 581                 }
 582                 break;
 583 #endif
 584         default:
 585                 return;
 586         }
 587         r_net = sctp_findnet(stcb, (struct sockaddr *)&store);
 588         if (r_net == NULL) {
 589                 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n");
 590                 return;
 591         }
 592         if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) &&
 593             (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) &&
 594             (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) {
 595                 /*
 596                  * If the its a HB and it's random value is correct when can
 597                  * confirm the destination.
 598                  */
 599                 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
 600                 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) {
 601                         stcb->asoc.primary_destination = r_net;
 602                         r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY;
 603                         f_net = TAILQ_FIRST(&stcb->asoc.nets);
 604                         if (f_net != r_net) {
 605                                 /*
 606                                  * first one on the list is NOT the primary
 607                                  * sctp_cmpaddr() is much more efficent if
 608                                  * the primary is the first on the list,
 609                                  * make it so.
 610                                  */
 611                                 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next);
 612                                 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next);
 613                         }
 614                         req_prim = 1;
 615                 }
 616                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
 617                     stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED);
 618                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3);
 619                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
 620         }
 621         old_error_counter = r_net->error_count;
 622         r_net->error_count = 0;
 623         r_net->hb_responded = 1;
 624         tv.tv_sec = cp->heartbeat.hb_info.time_value_1;
 625         tv.tv_usec = cp->heartbeat.hb_info.time_value_2;
 626         /* Now lets do a RTO with this */
 627         r_net->RTO = sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, sctp_align_safe_nocopy,
 628             SCTP_RTT_FROM_NON_DATA);
 629         if (!(r_net->dest_state & SCTP_ADDR_REACHABLE)) {
 630                 r_net->dest_state |= SCTP_ADDR_REACHABLE;
 631                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb,
 632                     0, (void *)r_net, SCTP_SO_NOT_LOCKED);
 633         }
 634         if (r_net->dest_state & SCTP_ADDR_PF) {
 635                 r_net->dest_state &= ~SCTP_ADDR_PF;
 636                 stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net);
 637         }
 638         if (old_error_counter > 0) {
 639                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3);
 640                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
 641         }
 642         if (r_net == stcb->asoc.primary_destination) {
 643                 if (stcb->asoc.alternate) {
 644                         /* release the alternate, primary is good */
 645                         sctp_free_remote_addr(stcb->asoc.alternate);
 646                         stcb->asoc.alternate = NULL;
 647                 }
 648         }
 649         /* Mobility adaptation */
 650         if (req_prim) {
 651                 if ((sctp_is_mobility_feature_on(stcb->sctp_ep,
 652                     SCTP_MOBILITY_BASE) ||
 653                     sctp_is_mobility_feature_on(stcb->sctp_ep,
 654                     SCTP_MOBILITY_FASTHANDOFF)) &&
 655                     sctp_is_mobility_feature_on(stcb->sctp_ep,
 656                     SCTP_MOBILITY_PRIM_DELETED)) {
 657
 658                         sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED, stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_TIMER + SCTP_LOC_7);
 659                         if (sctp_is_mobility_feature_on(stcb->sctp_ep,
 660                             SCTP_MOBILITY_FASTHANDOFF)) {
 661                                 sctp_assoc_immediate_retrans(stcb,
 662                                     stcb->asoc.primary_destination);
 663                         }
 664                         if (sctp_is_mobility_feature_on(stcb->sctp_ep,
 665                             SCTP_MOBILITY_BASE)) {
 666                                 sctp_move_chunks_from_net(stcb,
 667                                     stcb->asoc.deleted_primary);
 668                         }
 669                         sctp_delete_prim_timer(stcb->sctp_ep, stcb,
 670                             stcb->asoc.deleted_primary);
 671                 }
 672         }
 673 }
 674
 675 static int
 676 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb)
 677 {
 678         /*
 679          * return 0 means we want you to proceed with the abort non-zero
 680          * means no abort processing
 681          */
 682         struct sctpasochead *head;
 683
 684         if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_WAIT) {
 685                 /* generate a new vtag and send init */
 686                 LIST_REMOVE(stcb, sctp_asocs);
 687                 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1);
 688                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
 689                 /*
 690                  * put it in the bucket in the vtag hash of assoc's for the
 691                  * system
 692                  */
 693                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
 694                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
 695                 return (1);
 696         }
 697         if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) {
 698                 /*
 699                  * treat like a case where the cookie expired i.e.: - dump
 700                  * current cookie. - generate a new vtag. - resend init.
 701                  */
 702                 /* generate a new vtag and send init */
 703                 LIST_REMOVE(stcb, sctp_asocs);
 704                 stcb->asoc.state &= ~SCTP_STATE_COOKIE_ECHOED;
 705                 stcb->asoc.state |= SCTP_STATE_COOKIE_WAIT;
 706                 sctp_stop_all_cookie_timers(stcb);
 707                 sctp_toss_old_cookies(stcb, &stcb->asoc);
 708                 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1);
 709                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
 710                 /*
 711                  * put it in the bucket in the vtag hash of assoc's for the
 712                  * system
 713                  */
 714                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
 715                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
 716                 return (1);
 717         }
 718         return (0);
 719 }
 720
 721 static int
 722 sctp_handle_nat_missing_state(struct sctp_tcb *stcb,
 723     struct sctp_nets *net)
 724 {
 725         /*
 726          * return 0 means we want you to proceed with the abort non-zero
 727          * means no abort processing
 728          */
 729         if (stcb->asoc.peer_supports_auth == 0) {
 730                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n");
 731                 return (0);
 732         }
 733         sctp_asconf_send_nat_state_update(stcb, net);
 734         return (1);
 735 }
 736
 737
 738 static void
 739 sctp_handle_abort(struct sctp_abort_chunk *abort,
 740     struct sctp_tcb *stcb, struct sctp_nets *net)
 741 {
 742 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 743         struct socket *so;
 744
 745 #endif
 746         uint16_t len;
 747         uint16_t error;
 748
 749         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n");
 750         if (stcb == NULL)
 751                 return;
 752
 753         len = ntohs(abort->ch.chunk_length);
 754         if (len > sizeof(struct sctp_chunkhdr)) {
 755                 /*
 756                  * Need to check the cause codes for our two magic nat
 757                  * aborts which don't kill the assoc necessarily.
 758                  */
 759                 struct sctp_missing_nat_state *natc;
 760
 761                 natc = (struct sctp_missing_nat_state *)(abort + 1);
 762                 error = ntohs(natc->cause);
 763                 if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) {
 764                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n",
 765                             abort->ch.chunk_flags);
 766                         if (sctp_handle_nat_colliding_state(stcb)) {
 767                                 return;
 768                         }
 769                 } else if (error == SCTP_CAUSE_NAT_MISSING_STATE) {
 770                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n",
 771                             abort->ch.chunk_flags);
 772                         if (sctp_handle_nat_missing_state(stcb, net)) {
 773                                 return;
 774                         }
 775                 }
 776         } else {
 777                 error = 0;
 778         }
 779         /* stop any receive timers */
 780         sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_6);
 781         /* notify user of the abort and clean up... */
 782         sctp_abort_notification(stcb, 1, error, abort, SCTP_SO_NOT_LOCKED);
 783         /* free the tcb */
 784         SCTP_STAT_INCR_COUNTER32(sctps_aborted);
 785         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) ||
 786             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
 787                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 788         }
 789 #ifdef SCTP_ASOCLOG_OF_TSNS
 790         sctp_print_out_track_log(stcb);
 791 #endif
 792 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 793         so = SCTP_INP_SO(stcb->sctp_ep);
 794         atomic_add_int(&stcb->asoc.refcnt, 1);
 795         SCTP_TCB_UNLOCK(stcb);
 796         SCTP_SOCKET_LOCK(so, 1);
 797         SCTP_TCB_LOCK(stcb);
 798         atomic_subtract_int(&stcb->asoc.refcnt, 1);
 799 #endif
 800         stcb->asoc.state |= SCTP_STATE_WAS_ABORTED;
 801         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
 802             SCTP_FROM_SCTP_INPUT + SCTP_LOC_6);
 803 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 804         SCTP_SOCKET_UNLOCK(so, 1);
 805 #endif
 806         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n");
 807 }
 808
 809 static void
 810 sctp_start_net_timers(struct sctp_tcb *stcb)
 811 {
 812         uint32_t cnt_hb_sent;
 813         struct sctp_nets *net;
 814
 815         cnt_hb_sent = 0;
 816         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
 817                 /*
 818                  * For each network start: 1) A pmtu timer. 2) A HB timer 3)
 819                  * If the dest in unconfirmed send a hb as well if under
 820                  * max_hb_burst have been sent.
 821                  */
 822                 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net);
 823                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net);
 824                 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) &&
 825                     (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) {
 826                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
 827                         cnt_hb_sent++;
 828                 }
 829         }
 830         if (cnt_hb_sent) {
 831                 sctp_chunk_output(stcb->sctp_ep, stcb,
 832                     SCTP_OUTPUT_FROM_COOKIE_ACK,
 833                     SCTP_SO_NOT_LOCKED);
 834         }
 835 }
 836
 837
 838 static void
 839 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp,
 840     struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag)
 841 {
 842         struct sctp_association *asoc;
 843         int some_on_streamwheel;
 844
 845 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 846         struct socket *so;
 847
 848 #endif
 849
 850         SCTPDBG(SCTP_DEBUG_INPUT2,
 851             "sctp_handle_shutdown: handling SHUTDOWN\n");
 852         if (stcb == NULL)
 853                 return;
 854         asoc = &stcb->asoc;
 855         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
 856             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
 857                 return;
 858         }
 859         if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) {
 860                 /* Shutdown NOT the expected size */
 861                 return;
 862         } else {
 863                 sctp_update_acked(stcb, cp, abort_flag);
 864                 if (*abort_flag) {
 865                         return;
 866                 }
 867         }
 868         if (asoc->control_pdapi) {
 869                 /*
 870                  * With a normal shutdown we assume the end of last record.
 871                  */
 872                 SCTP_INP_READ_LOCK(stcb->sctp_ep);
 873                 asoc->control_pdapi->end_added = 1;
 874                 asoc->control_pdapi->pdapi_aborted = 1;
 875                 asoc->control_pdapi = NULL;
 876                 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
 877 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 878                 so = SCTP_INP_SO(stcb->sctp_ep);
 879                 atomic_add_int(&stcb->asoc.refcnt, 1);
 880                 SCTP_TCB_UNLOCK(stcb);
 881                 SCTP_SOCKET_LOCK(so, 1);
 882                 SCTP_TCB_LOCK(stcb);
 883                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 884                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
 885                         /* assoc was freed while we were unlocked */
 886                         SCTP_SOCKET_UNLOCK(so, 1);
 887                         return;
 888                 }
 889 #endif
 890                 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
 891 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 892                 SCTP_SOCKET_UNLOCK(so, 1);
 893 #endif
 894         }
 895         /* goto SHUTDOWN_RECEIVED state to block new requests */
 896         if (stcb->sctp_socket) {
 897                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
 898                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) &&
 899                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) {
 900                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_RECEIVED);
 901                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
 902                         /*
 903                          * notify upper layer that peer has initiated a
 904                          * shutdown
 905                          */
 906                         sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
 907
 908                         /* reset time */
 909                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
 910                 }
 911         }
 912         if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) {
 913                 /*
 914                  * stop the shutdown timer, since we WILL move to
 915                  * SHUTDOWN-ACK-SENT.
 916                  */
 917                 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_8);
 918         }
 919         /* Now is there unsent data on a stream somewhere? */
 920         some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED);
 921
 922         if (!TAILQ_EMPTY(&asoc->send_queue) ||
 923             !TAILQ_EMPTY(&asoc->sent_queue) ||
 924             some_on_streamwheel) {
 925                 /* By returning we will push more data out */
 926                 return;
 927         } else {
 928                 /* no outstanding data to send, so move on... */
 929                 /* send SHUTDOWN-ACK */
 930                 sctp_send_shutdown_ack(stcb, net);
 931                 /* move to SHUTDOWN-ACK-SENT state */
 932                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
 933                     (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
 934                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 935                 }
 936                 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT);
 937                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
 938                 sctp_stop_timers_for_shutdown(stcb);
 939                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep,
 940                     stcb, net);
 941         }
 942 }
 943
 944 static void
 945 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED,
 946     struct sctp_tcb *stcb,
 947     struct sctp_nets *net)
 948 {
 949         struct sctp_association *asoc;
 950
 951 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 952         struct socket *so;
 953
 954         so = SCTP_INP_SO(stcb->sctp_ep);
 955 #endif
 956         SCTPDBG(SCTP_DEBUG_INPUT2,
 957             "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n");
 958         if (stcb == NULL)
 959                 return;
 960
 961         asoc = &stcb->asoc;
 962         /* process according to association state */
 963         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
 964             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
 965                 /* unexpected SHUTDOWN-ACK... do OOTB handling... */
 966                 sctp_send_shutdown_complete(stcb, net, 1);
 967                 SCTP_TCB_UNLOCK(stcb);
 968                 return;
 969         }
 970         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
 971             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
 972                 /* unexpected SHUTDOWN-ACK... so ignore... */
 973                 SCTP_TCB_UNLOCK(stcb);
 974                 return;
 975         }
 976         if (asoc->control_pdapi) {
 977                 /*
 978                  * With a normal shutdown we assume the end of last record.
 979                  */
 980                 SCTP_INP_READ_LOCK(stcb->sctp_ep);
 981                 asoc->control_pdapi->end_added = 1;
 982                 asoc->control_pdapi->pdapi_aborted = 1;
 983                 asoc->control_pdapi = NULL;
 984                 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
 985 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 986                 atomic_add_int(&stcb->asoc.refcnt, 1);
 987                 SCTP_TCB_UNLOCK(stcb);
 988                 SCTP_SOCKET_LOCK(so, 1);
 989                 SCTP_TCB_LOCK(stcb);
 990                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 991                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
 992                         /* assoc was freed while we were unlocked */
 993                         SCTP_SOCKET_UNLOCK(so, 1);
 994                         return;
 995                 }
 996 #endif
 997                 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
 998 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 999                 SCTP_SOCKET_UNLOCK(so, 1);
1000 #endif
1001         }
1002         /* are the queues empty? */
1003         if (!TAILQ_EMPTY(&asoc->send_queue) ||
1004             !TAILQ_EMPTY(&asoc->sent_queue) ||
1005             !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
1006                 sctp_report_all_outbound(stcb, 0, 0, SCTP_SO_NOT_LOCKED);
1007         }
1008         /* stop the timer */
1009         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9);
1010         /* send SHUTDOWN-COMPLETE */
1011         sctp_send_shutdown_complete(stcb, net, 0);
1012         /* notify upper layer protocol */
1013         if (stcb->sctp_socket) {
1014                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1015                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
1016                         stcb->sctp_socket->so_snd.sb_cc = 0;
1017                 }
1018                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
1019         }
1020         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
1021         /* free the TCB but first save off the ep */
1022 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1023         atomic_add_int(&stcb->asoc.refcnt, 1);
1024         SCTP_TCB_UNLOCK(stcb);
1025         SCTP_SOCKET_LOCK(so, 1);
1026         SCTP_TCB_LOCK(stcb);
1027         atomic_subtract_int(&stcb->asoc.refcnt, 1);
1028 #endif
1029         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1030             SCTP_FROM_SCTP_INPUT + SCTP_LOC_10);
1031 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1032         SCTP_SOCKET_UNLOCK(so, 1);
1033 #endif
1034 }
1035
1036 /*
1037  * Skip past the param header and then we will find the chunk that caused the
1038  * problem. There are two possiblities ASCONF or FWD-TSN other than that and
1039  * our peer must be broken.
1040  */
1041 static void
1042 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr,
1043     struct sctp_nets *net)
1044 {
1045         struct sctp_chunkhdr *chk;
1046
1047         chk = (struct sctp_chunkhdr *)((caddr_t)phdr + sizeof(*phdr));
1048         switch (chk->chunk_type) {
1049         case SCTP_ASCONF_ACK:
1050         case SCTP_ASCONF:
1051                 sctp_asconf_cleanup(stcb, net);
1052                 break;
1053         case SCTP_FORWARD_CUM_TSN:
1054                 stcb->asoc.peer_supports_prsctp = 0;
1055                 break;
1056         default:
1057                 SCTPDBG(SCTP_DEBUG_INPUT2,
1058                     "Peer does not support chunk type %d(%x)??\n",
1059                     chk->chunk_type, (uint32_t) chk->chunk_type);
1060                 break;
1061         }
1062 }
1063
1064 /*
1065  * Skip past the param header and then we will find the param that caused the
1066  * problem.  There are a number of param's in a ASCONF OR the prsctp param
1067  * these will turn of specific features.
1068  */
1069 static void
1070 sctp_process_unrecog_param(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr)
1071 {
1072         struct sctp_paramhdr *pbad;
1073
1074         pbad = phdr + 1;
1075         switch (ntohs(pbad->param_type)) {
1076                 /* pr-sctp draft */
1077         case SCTP_PRSCTP_SUPPORTED:
1078                 stcb->asoc.peer_supports_prsctp = 0;
1079                 break;
1080         case SCTP_SUPPORTED_CHUNK_EXT:
1081                 break;
1082                 /* draft-ietf-tsvwg-addip-sctp */
1083         case SCTP_HAS_NAT_SUPPORT:
1084                 stcb->asoc.peer_supports_nat = 0;
1085                 break;
1086         case SCTP_ADD_IP_ADDRESS:
1087         case SCTP_DEL_IP_ADDRESS:
1088         case SCTP_SET_PRIM_ADDR:
1089                 stcb->asoc.peer_supports_asconf = 0;
1090                 break;
1091         case SCTP_SUCCESS_REPORT:
1092         case SCTP_ERROR_CAUSE_IND:
1093                 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n");
1094                 SCTPDBG(SCTP_DEBUG_INPUT2,
1095                     "Turning off ASCONF to this strange peer\n");
1096                 stcb->asoc.peer_supports_asconf = 0;
1097                 break;
1098         default:
1099                 SCTPDBG(SCTP_DEBUG_INPUT2,
1100                     "Peer does not support param type %d(%x)??\n",
1101                     pbad->param_type, (uint32_t) pbad->param_type);
1102                 break;
1103         }
1104 }
1105
1106 static int
1107 sctp_handle_error(struct sctp_chunkhdr *ch,
1108     struct sctp_tcb *stcb, struct sctp_nets *net)
1109 {
1110         int chklen;
1111         struct sctp_paramhdr *phdr;
1112         uint16_t error, error_type;
1113         uint16_t error_len;
1114         struct sctp_association *asoc;
1115         int adjust;
1116
1117 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1118         struct socket *so;
1119
1120 #endif
1121
1122         /* parse through all of the errors and process */
1123         asoc = &stcb->asoc;
1124         phdr = (struct sctp_paramhdr *)((caddr_t)ch +
1125             sizeof(struct sctp_chunkhdr));
1126         chklen = ntohs(ch->chunk_length) - sizeof(struct sctp_chunkhdr);
1127         error = 0;
1128         while ((size_t)chklen >= sizeof(struct sctp_paramhdr)) {
1129                 /* Process an Error Cause */
1130                 error_type = ntohs(phdr->param_type);
1131                 error_len = ntohs(phdr->param_length);
1132                 if ((error_len > chklen) || (error_len == 0)) {
1133                         /* invalid param length for this param */
1134                         SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in error param- chunk left:%d errorlen:%d\n",
1135                             chklen, error_len);
1136                         return (0);
1137                 }
1138                 if (error == 0) {
1139                         /* report the first error cause */
1140                         error = error_type;
1141                 }
1142                 switch (error_type) {
1143                 case SCTP_CAUSE_INVALID_STREAM:
1144                 case SCTP_CAUSE_MISSING_PARAM:
1145                 case SCTP_CAUSE_INVALID_PARAM:
1146                 case SCTP_CAUSE_NO_USER_DATA:
1147                         SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %d back? We have a bug :/ (or do they?)\n",
1148                             error_type);
1149                         break;
1150                 case SCTP_CAUSE_NAT_COLLIDING_STATE:
1151                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n",
1152                             ch->chunk_flags);
1153                         if (sctp_handle_nat_colliding_state(stcb)) {
1154                                 return (0);
1155                         }
1156                         break;
1157                 case SCTP_CAUSE_NAT_MISSING_STATE:
1158                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n",
1159                             ch->chunk_flags);
1160                         if (sctp_handle_nat_missing_state(stcb, net)) {
1161                                 return (0);
1162                         }
1163                         break;
1164                 case SCTP_CAUSE_STALE_COOKIE:
1165                         /*
1166                          * We only act if we have echoed a cookie and are
1167                          * waiting.
1168                          */
1169                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) {
1170                                 int *p;
1171
1172                                 p = (int *)((caddr_t)phdr + sizeof(*phdr));
1173                                 /* Save the time doubled */
1174                                 asoc->cookie_preserve_req = ntohl(*p) << 1;
1175                                 asoc->stale_cookie_count++;
1176                                 if (asoc->stale_cookie_count >
1177                                     asoc->max_init_times) {
1178                                         sctp_abort_notification(stcb, 0, 0, NULL, SCTP_SO_NOT_LOCKED);
1179                                         /* now free the asoc */
1180 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1181                                         so = SCTP_INP_SO(stcb->sctp_ep);
1182                                         atomic_add_int(&stcb->asoc.refcnt, 1);
1183                                         SCTP_TCB_UNLOCK(stcb);
1184                                         SCTP_SOCKET_LOCK(so, 1);
1185                                         SCTP_TCB_LOCK(stcb);
1186                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
1187 #endif
1188                                         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1189                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_11);
1190 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1191                                         SCTP_SOCKET_UNLOCK(so, 1);
1192 #endif
1193                                         return (-1);
1194                                 }
1195                                 /* blast back to INIT state */
1196                                 sctp_toss_old_cookies(stcb, &stcb->asoc);
1197                                 asoc->state &= ~SCTP_STATE_COOKIE_ECHOED;
1198                                 asoc->state |= SCTP_STATE_COOKIE_WAIT;
1199                                 sctp_stop_all_cookie_timers(stcb);
1200                                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
1201                         }
1202                         break;
1203                 case SCTP_CAUSE_UNRESOLVABLE_ADDR:
1204                         /*
1205                          * Nothing we can do here, we don't do hostname
1206                          * addresses so if the peer does not like my IPv6
1207                          * (or IPv4 for that matter) it does not matter. If
1208                          * they don't support that type of address, they can
1209                          * NOT possibly get that packet type... i.e. with no
1210                          * IPv6 you can't recieve a IPv6 packet. so we can
1211                          * safely ignore this one. If we ever added support
1212                          * for HOSTNAME Addresses, then we would need to do
1213                          * something here.
1214                          */
1215                         break;
1216                 case SCTP_CAUSE_UNRECOG_CHUNK:
1217                         sctp_process_unrecog_chunk(stcb, phdr, net);
1218                         break;
1219                 case SCTP_CAUSE_UNRECOG_PARAM:
1220                         sctp_process_unrecog_param(stcb, phdr);
1221                         break;
1222                 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN:
1223                         /*
1224                          * We ignore this since the timer will drive out a
1225                          * new cookie anyway and there timer will drive us
1226                          * to send a SHUTDOWN_COMPLETE. We can't send one
1227                          * here since we don't have their tag.
1228                          */
1229                         break;
1230                 case SCTP_CAUSE_DELETING_LAST_ADDR:
1231                 case SCTP_CAUSE_RESOURCE_SHORTAGE:
1232                 case SCTP_CAUSE_DELETING_SRC_ADDR:
1233                         /*
1234                          * We should NOT get these here, but in a
1235                          * ASCONF-ACK.
1236                          */
1237                         SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a Operational Error?<%d>?\n",
1238                             error_type);
1239                         break;
1240                 case SCTP_CAUSE_OUT_OF_RESC:
1241                         /*
1242                          * And what, pray tell do we do with the fact that
1243                          * the peer is out of resources? Not really sure we
1244                          * could do anything but abort. I suspect this
1245                          * should have came WITH an abort instead of in a
1246                          * OP-ERROR.
1247                          */
1248                         break;
1249                 default:
1250                         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown error type = 0x%xh\n",
1251                             error_type);
1252                         break;
1253                 }
1254                 adjust = SCTP_SIZE32(error_len);
1255                 chklen -= adjust;
1256                 phdr = (struct sctp_paramhdr *)((caddr_t)phdr + adjust);
1257         }
1258         sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, error, ch, SCTP_SO_NOT_LOCKED);
1259         return (0);
1260 }
1261
1262 static int
1263 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset,
1264     struct sctphdr *sh, struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
1265     struct sctp_nets *net, int *abort_no_unlock, uint32_t vrf_id)
1266 {
1267         struct sctp_init_ack *init_ack;
1268         struct mbuf *op_err;
1269
1270         SCTPDBG(SCTP_DEBUG_INPUT2,
1271             "sctp_handle_init_ack: handling INIT-ACK\n");
1272
1273         if (stcb == NULL) {
1274                 SCTPDBG(SCTP_DEBUG_INPUT2,
1275                     "sctp_handle_init_ack: TCB is null\n");
1276                 return (-1);
1277         }
1278         if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) {
1279                 /* Invalid length */
1280                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
1281                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh,
1282                     op_err, 0, net->port);
1283                 *abort_no_unlock = 1;
1284                 return (-1);
1285         }
1286         init_ack = &cp->init;
1287         /* validate parameters */
1288         if (init_ack->initiate_tag == 0) {
1289                 /* protocol error... send an abort */
1290                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
1291                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh,
1292                     op_err, 0, net->port);
1293                 *abort_no_unlock = 1;
1294                 return (-1);
1295         }
1296         if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) {
1297                 /* protocol error... send an abort */
1298                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
1299                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh,
1300                     op_err, 0, net->port);
1301                 *abort_no_unlock = 1;
1302                 return (-1);
1303         }
1304         if (init_ack->num_inbound_streams == 0) {
1305                 /* protocol error... send an abort */
1306                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
1307                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh,
1308                     op_err, 0, net->port);
1309                 *abort_no_unlock = 1;
1310                 return (-1);
1311         }
1312         if (init_ack->num_outbound_streams == 0) {
1313                 /* protocol error... send an abort */
1314                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
1315                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh,
1316                     op_err, 0, net->port);
1317                 *abort_no_unlock = 1;
1318                 return (-1);
1319         }
1320         /* process according to association state... */
1321         switch (stcb->asoc.state & SCTP_STATE_MASK) {
1322         case SCTP_STATE_COOKIE_WAIT:
1323                 /* this is the expected state for this chunk */
1324                 /* process the INIT-ACK parameters */
1325                 if (stcb->asoc.primary_destination->dest_state &
1326                     SCTP_ADDR_UNCONFIRMED) {
1327                         /*
1328                          * The primary is where we sent the INIT, we can
1329                          * always consider it confirmed when the INIT-ACK is
1330                          * returned. Do this before we load addresses
1331                          * though.
1332                          */
1333                         stcb->asoc.primary_destination->dest_state &=
1334                             ~SCTP_ADDR_UNCONFIRMED;
1335                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
1336                             stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED);
1337                 }
1338                 if (sctp_process_init_ack(m, iphlen, offset, sh, cp, stcb,
1339                     net, abort_no_unlock, vrf_id) < 0) {
1340                         /* error in parsing parameters */
1341                         return (-1);
1342                 }
1343                 /* update our state */
1344                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n");
1345                 SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_ECHOED);
1346
1347                 /* reset the RTO calc */
1348                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
1349                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
1350                             stcb->asoc.overall_error_count,
1351                             0,
1352                             SCTP_FROM_SCTP_INPUT,
1353                             __LINE__);
1354                 }
1355                 stcb->asoc.overall_error_count = 0;
1356                 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
1357                 /*
1358                  * collapse the init timer back in case of a exponential
1359                  * backoff
1360                  */
1361                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep,
1362                     stcb, net);
1363                 /*
1364                  * the send at the end of the inbound data processing will
1365                  * cause the cookie to be sent
1366                  */
1367                 break;
1368         case SCTP_STATE_SHUTDOWN_SENT:
1369                 /* incorrect state... discard */
1370                 break;
1371         case SCTP_STATE_COOKIE_ECHOED:
1372                 /* incorrect state... discard */
1373                 break;
1374         case SCTP_STATE_OPEN:
1375                 /* incorrect state... discard */
1376                 break;
1377         case SCTP_STATE_EMPTY:
1378         case SCTP_STATE_INUSE:
1379         default:
1380                 /* incorrect state... discard */
1381                 return (-1);
1382                 break;
1383         }
1384         SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n");
1385         return (0);
1386 }
1387
1388 static struct sctp_tcb *
1389 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
1390     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1391     struct sctp_inpcb *inp, struct sctp_nets **netp,
1392     struct sockaddr *init_src, int *notification,
1393     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1394     uint32_t vrf_id, uint16_t port);
1395
1396
1397 /*
1398  * handle a state cookie for an existing association m: input packet mbuf
1399  * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a
1400  * "split" mbuf and the cookie signature does not exist offset: offset into
1401  * mbuf to the cookie-echo chunk
1402  */
1403 static struct sctp_tcb *
1404 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset,
1405     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1406     struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp,
1407     struct sockaddr *init_src, int *notification,
1408     uint32_t vrf_id, int auth_skipped, uint32_t auth_offset, uint32_t auth_len, uint16_t port)
1409 {
1410         struct sctp_association *asoc;
1411         struct sctp_init_chunk *init_cp, init_buf;
1412         struct sctp_init_ack_chunk *initack_cp, initack_buf;
1413         struct sctp_nets *net;
1414         struct mbuf *op_err;
1415         struct sctp_paramhdr *ph;
1416         int init_offset, initack_offset, i;
1417         int retval;
1418         int spec_flag = 0;
1419         uint32_t how_indx;
1420
1421         net = *netp;
1422         /* I know that the TCB is non-NULL from the caller */
1423         asoc = &stcb->asoc;
1424         for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) {
1425                 if (asoc->cookie_how[how_indx] == 0)
1426                         break;
1427         }
1428         if (how_indx < sizeof(asoc->cookie_how)) {
1429                 asoc->cookie_how[how_indx] = 1;
1430         }
1431         if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
1432                 /* SHUTDOWN came in after sending INIT-ACK */
1433                 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination);
1434                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
1435                     0, M_DONTWAIT, 1, MT_DATA);
1436                 if (op_err == NULL) {
1437                         /* FOOBAR */
1438                         return (NULL);
1439                 }
1440                 /* Set the len */
1441                 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_paramhdr);
1442                 ph = mtod(op_err, struct sctp_paramhdr *);
1443                 ph->param_type = htons(SCTP_CAUSE_COOKIE_IN_SHUTDOWN);
1444                 ph->param_length = htons(sizeof(struct sctp_paramhdr));
1445                 sctp_send_operr_to(m, iphlen, op_err, cookie->peers_vtag,
1446                     vrf_id, net->port);
1447                 if (how_indx < sizeof(asoc->cookie_how))
1448                         asoc->cookie_how[how_indx] = 2;
1449                 return (NULL);
1450         }
1451         /*
1452          * find and validate the INIT chunk in the cookie (peer's info) the
1453          * INIT should start after the cookie-echo header struct (chunk
1454          * header, state cookie header struct)
1455          */
1456         init_offset = offset += sizeof(struct sctp_cookie_echo_chunk);
1457
1458         init_cp = (struct sctp_init_chunk *)
1459             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
1460             (uint8_t *) & init_buf);
1461         if (init_cp == NULL) {
1462                 /* could not pull a INIT chunk in cookie */
1463                 return (NULL);
1464         }
1465         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
1466                 return (NULL);
1467         }
1468         /*
1469          * find and validate the INIT-ACK chunk in the cookie (my info) the
1470          * INIT-ACK follows the INIT chunk
1471          */
1472         initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
1473         initack_cp = (struct sctp_init_ack_chunk *)
1474             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
1475             (uint8_t *) & initack_buf);
1476         if (initack_cp == NULL) {
1477                 /* could not pull INIT-ACK chunk in cookie */
1478                 return (NULL);
1479         }
1480         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
1481                 return (NULL);
1482         }
1483         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1484             (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) {
1485                 /*
1486                  * case D in Section 5.2.4 Table 2: MMAA process accordingly
1487                  * to get into the OPEN state
1488                  */
1489                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1490                         /*-
1491                          * Opps, this means that we somehow generated two vtag's
1492                          * the same. I.e. we did:
1493                          *  Us               Peer
1494                          *   <---INIT(tag=a)------
1495                          *   ----INIT-ACK(tag=t)-->
1496                          *   ----INIT(tag=t)------> *1
1497                          *   <---INIT-ACK(tag=a)---
1498                          *   <----CE(tag=t)------------- *2
1499                          *
1500                          * At point *1 we should be generating a different
1501                          * tag t'. Which means we would throw away the CE and send
1502                          * ours instead. Basically this is case C (throw away side).
1503                          */
1504                         if (how_indx < sizeof(asoc->cookie_how))
1505                                 asoc->cookie_how[how_indx] = 17;
1506                         return (NULL);
1507
1508                 }
1509                 switch SCTP_GET_STATE
1510                         (asoc) {
1511                 case SCTP_STATE_COOKIE_WAIT:
1512                 case SCTP_STATE_COOKIE_ECHOED:
1513                         /*
1514                          * INIT was sent but got a COOKIE_ECHO with the
1515                          * correct tags... just accept it...but we must
1516                          * process the init so that we can make sure we have
1517                          * the right seq no's.
1518                          */
1519                         /* First we must process the INIT !! */
1520                         retval = sctp_process_init(init_cp, stcb);
1521                         if (retval < 0) {
1522                                 if (how_indx < sizeof(asoc->cookie_how))
1523                                         asoc->cookie_how[how_indx] = 3;
1524                                 return (NULL);
1525                         }
1526                         /* we have already processed the INIT so no problem */
1527                         sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb,
1528                             net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_12);
1529                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_13);
1530                         /* update current state */
1531                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)
1532                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1533                         else
1534                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1535
1536                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1537                         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1538                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1539                                     stcb->sctp_ep, stcb, asoc->primary_destination);
1540                         }
1541                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1542                         sctp_stop_all_cookie_timers(stcb);
1543                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1544                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1545                             (inp->sctp_socket->so_qlimit == 0)
1546                             ) {
1547 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1548                                 struct socket *so;
1549
1550 #endif
1551                                 /*
1552                                  * Here is where collision would go if we
1553                                  * did a connect() and instead got a
1554                                  * init/init-ack/cookie done before the
1555                                  * init-ack came back..
1556                                  */
1557                                 stcb->sctp_ep->sctp_flags |=
1558                                     SCTP_PCB_FLAGS_CONNECTED;
1559 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1560                                 so = SCTP_INP_SO(stcb->sctp_ep);
1561                                 atomic_add_int(&stcb->asoc.refcnt, 1);
1562                                 SCTP_TCB_UNLOCK(stcb);
1563                                 SCTP_SOCKET_LOCK(so, 1);
1564                                 SCTP_TCB_LOCK(stcb);
1565                                 atomic_add_int(&stcb->asoc.refcnt, -1);
1566                                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1567                                         SCTP_SOCKET_UNLOCK(so, 1);
1568                                         return (NULL);
1569                                 }
1570 #endif
1571                                 soisconnected(stcb->sctp_socket);
1572 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1573                                 SCTP_SOCKET_UNLOCK(so, 1);
1574 #endif
1575                         }
1576                         /* notify upper layer */
1577                         *notification = SCTP_NOTIFY_ASSOC_UP;
1578                         /*
1579                          * since we did not send a HB make sure we don't
1580                          * double things
1581                          */
1582                         net->hb_responded = 1;
1583                         net->RTO = sctp_calculate_rto(stcb, asoc, net,
1584                             &cookie->time_entered,
1585                             sctp_align_unsafe_makecopy,
1586                             SCTP_RTT_FROM_NON_DATA);
1587
1588                         if (stcb->asoc.sctp_autoclose_ticks &&
1589                             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) {
1590                                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
1591                                     inp, stcb, NULL);
1592                         }
1593                         break;
1594                 default:
1595                         /*
1596                          * we're in the OPEN state (or beyond), so peer must
1597                          * have simply lost the COOKIE-ACK
1598                          */
1599                         break;
1600                         }       /* end switch */
1601                 sctp_stop_all_cookie_timers(stcb);
1602                 /*
1603                  * We ignore the return code here.. not sure if we should
1604                  * somehow abort.. but we do have an existing asoc. This
1605                  * really should not fail.
1606                  */
1607                 if (sctp_load_addresses_from_init(stcb, m,
1608                     init_offset + sizeof(struct sctp_init_chunk),
1609                     initack_offset, sh, init_src)) {
1610                         if (how_indx < sizeof(asoc->cookie_how))
1611                                 asoc->cookie_how[how_indx] = 4;
1612                         return (NULL);
1613                 }
1614                 /* respond with a COOKIE-ACK */
1615                 sctp_toss_old_cookies(stcb, asoc);
1616                 sctp_send_cookie_ack(stcb);
1617                 if (how_indx < sizeof(asoc->cookie_how))
1618                         asoc->cookie_how[how_indx] = 5;
1619                 return (stcb);
1620         }
1621         if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1622             ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag &&
1623             cookie->tie_tag_my_vtag == 0 &&
1624             cookie->tie_tag_peer_vtag == 0) {
1625                 /*
1626                  * case C in Section 5.2.4 Table 2: XMOO silently discard
1627                  */
1628                 if (how_indx < sizeof(asoc->cookie_how))
1629                         asoc->cookie_how[how_indx] = 6;
1630                 return (NULL);
1631         }
1632         /*
1633          * If nat support, and the below and stcb is established, send back
1634          * a ABORT(colliding state) if we are established.
1635          */
1636         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) &&
1637             (asoc->peer_supports_nat) &&
1638             ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1639             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1640             (asoc->peer_vtag == 0)))) {
1641                 /*
1642                  * Special case - Peer's support nat. We may have two init's
1643                  * that we gave out the same tag on since one was not
1644                  * established.. i.e. we get INIT from host-1 behind the nat
1645                  * and we respond tag-a, we get a INIT from host-2 behind
1646                  * the nat and we get tag-a again. Then we bring up host-1
1647                  * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1).
1648                  * Now we have colliding state. We must send an abort here
1649                  * with colliding state indication.
1650                  */
1651                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
1652                     0, M_DONTWAIT, 1, MT_DATA);
1653                 if (op_err == NULL) {
1654                         /* FOOBAR */
1655                         return (NULL);
1656                 }
1657                 /* pre-reserve some space */
1658 #ifdef INET6
1659                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
1660 #else
1661                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
1662 #endif
1663                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
1664                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
1665                 /* Set the len */
1666                 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_paramhdr);
1667                 ph = mtod(op_err, struct sctp_paramhdr *);
1668                 ph->param_type = htons(SCTP_CAUSE_NAT_COLLIDING_STATE);
1669                 ph->param_length = htons(sizeof(struct sctp_paramhdr));
1670                 sctp_send_abort(m, iphlen, sh, 0, op_err, vrf_id, port);
1671                 return (NULL);
1672         }
1673         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1674             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1675             (asoc->peer_vtag == 0))) {
1676                 /*
1677                  * case B in Section 5.2.4 Table 2: MXAA or MOAA my info
1678                  * should be ok, re-accept peer info
1679                  */
1680                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1681                         /*
1682                          * Extension of case C. If we hit this, then the
1683                          * random number generator returned the same vtag
1684                          * when we first sent our INIT-ACK and when we later
1685                          * sent our INIT. The side with the seq numbers that
1686                          * are different will be the one that normnally
1687                          * would have hit case C. This in effect "extends"
1688                          * our vtags in this collision case to be 64 bits.
1689                          * The same collision could occur aka you get both
1690                          * vtag and seq number the same twice in a row.. but
1691                          * is much less likely. If it did happen then we
1692                          * would proceed through and bring up the assoc.. we
1693                          * may end up with the wrong stream setup however..
1694                          * which would be bad.. but there is no way to
1695                          * tell.. until we send on a stream that does not
1696                          * exist :-)
1697                          */
1698                         if (how_indx < sizeof(asoc->cookie_how))
1699                                 asoc->cookie_how[how_indx] = 7;
1700
1701                         return (NULL);
1702                 }
1703                 if (how_indx < sizeof(asoc->cookie_how))
1704                         asoc->cookie_how[how_indx] = 8;
1705                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_14);
1706                 sctp_stop_all_cookie_timers(stcb);
1707                 /*
1708                  * since we did not send a HB make sure we don't double
1709                  * things
1710                  */
1711                 net->hb_responded = 1;
1712                 if (stcb->asoc.sctp_autoclose_ticks &&
1713                     sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
1714                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb,
1715                             NULL);
1716                 }
1717                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1718                 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
1719
1720                 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) {
1721                         /*
1722                          * Ok the peer probably discarded our data (if we
1723                          * echoed a cookie+data). So anything on the
1724                          * sent_queue should be marked for retransmit, we
1725                          * may not get something to kick us so it COULD
1726                          * still take a timeout to move these.. but it can't
1727                          * hurt to mark them.
1728                          */
1729                         struct sctp_tmit_chunk *chk;
1730
1731                         TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
1732                                 if (chk->sent < SCTP_DATAGRAM_RESEND) {
1733                                         chk->sent = SCTP_DATAGRAM_RESEND;
1734                                         sctp_flight_size_decrease(chk);
1735                                         sctp_total_flight_decrease(stcb, chk);
1736                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1737                                         spec_flag++;
1738                                 }
1739                         }
1740
1741                 }
1742                 /* process the INIT info (peer's info) */
1743                 retval = sctp_process_init(init_cp, stcb);
1744                 if (retval < 0) {
1745                         if (how_indx < sizeof(asoc->cookie_how))
1746                                 asoc->cookie_how[how_indx] = 9;
1747                         return (NULL);
1748                 }
1749                 if (sctp_load_addresses_from_init(stcb, m,
1750                     init_offset + sizeof(struct sctp_init_chunk),
1751                     initack_offset, sh, init_src)) {
1752                         if (how_indx < sizeof(asoc->cookie_how))
1753                                 asoc->cookie_how[how_indx] = 10;
1754                         return (NULL);
1755                 }
1756                 if ((asoc->state & SCTP_STATE_COOKIE_WAIT) ||
1757                     (asoc->state & SCTP_STATE_COOKIE_ECHOED)) {
1758                         *notification = SCTP_NOTIFY_ASSOC_UP;
1759
1760                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1761                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1762                             (inp->sctp_socket->so_qlimit == 0)) {
1763 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1764                                 struct socket *so;
1765
1766 #endif
1767                                 stcb->sctp_ep->sctp_flags |=
1768                                     SCTP_PCB_FLAGS_CONNECTED;
1769 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1770                                 so = SCTP_INP_SO(stcb->sctp_ep);
1771                                 atomic_add_int(&stcb->asoc.refcnt, 1);
1772                                 SCTP_TCB_UNLOCK(stcb);
1773                                 SCTP_SOCKET_LOCK(so, 1);
1774                                 SCTP_TCB_LOCK(stcb);
1775                                 atomic_add_int(&stcb->asoc.refcnt, -1);
1776                                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1777                                         SCTP_SOCKET_UNLOCK(so, 1);
1778                                         return (NULL);
1779                                 }
1780 #endif
1781                                 soisconnected(stcb->sctp_socket);
1782 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1783                                 SCTP_SOCKET_UNLOCK(so, 1);
1784 #endif
1785                         }
1786                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)
1787                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1788                         else
1789                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1790                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1791                 } else if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
1792                         SCTP_STAT_INCR_COUNTER32(sctps_restartestab);
1793                 } else {
1794                         SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1795                 }
1796                 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1797                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1798                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1799                             stcb->sctp_ep, stcb, asoc->primary_destination);
1800                 }
1801                 sctp_stop_all_cookie_timers(stcb);
1802                 sctp_toss_old_cookies(stcb, asoc);
1803                 sctp_send_cookie_ack(stcb);
1804                 if (spec_flag) {
1805                         /*
1806                          * only if we have retrans set do we do this. What
1807                          * this call does is get only the COOKIE-ACK out and
1808                          * then when we return the normal call to
1809                          * sctp_chunk_output will get the retrans out behind
1810                          * this.
1811                          */
1812                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED);
1813                 }
1814                 if (how_indx < sizeof(asoc->cookie_how))
1815                         asoc->cookie_how[how_indx] = 11;
1816
1817                 return (stcb);
1818         }
1819         if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1820             ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) &&
1821             cookie->tie_tag_my_vtag == asoc->my_vtag_nonce &&
1822             cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce &&
1823             cookie->tie_tag_peer_vtag != 0) {
1824                 struct sctpasochead *head;
1825
1826                 if (asoc->peer_supports_nat) {
1827                         /*
1828                          * This is a gross gross hack. just call the
1829                          * cookie_new code since we are allowing a duplicate
1830                          * association. I hope this works...
1831                          */
1832                         return (sctp_process_cookie_new(m, iphlen, offset, sh, cookie, cookie_len,
1833                             inp, netp, init_src, notification,
1834                             auth_skipped, auth_offset, auth_len,
1835                             vrf_id, port));
1836                 }
1837                 /*
1838                  * case A in Section 5.2.4 Table 2: XXMM (peer restarted)
1839                  */
1840                 /* temp code */
1841                 if (how_indx < sizeof(asoc->cookie_how))
1842                         asoc->cookie_how[how_indx] = 12;
1843                 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_15);
1844                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
1845
1846                 /* notify upper layer */
1847                 *notification = SCTP_NOTIFY_ASSOC_RESTART;
1848                 atomic_add_int(&stcb->asoc.refcnt, 1);
1849                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_OPEN) &&
1850                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
1851                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) {
1852                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1853                 }
1854                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
1855                         SCTP_STAT_INCR_GAUGE32(sctps_restartestab);
1856                 } else if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) {
1857                         SCTP_STAT_INCR_GAUGE32(sctps_collisionestab);
1858                 }
1859                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1860                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1861                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1862                             stcb->sctp_ep, stcb, asoc->primary_destination);
1863
1864                 } else if (!(asoc->state & SCTP_STATE_SHUTDOWN_SENT)) {
1865                         /* move to OPEN state, if not in SHUTDOWN_SENT */
1866                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1867                 }
1868                 asoc->pre_open_streams =
1869                     ntohs(initack_cp->init.num_outbound_streams);
1870                 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
1871                 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
1872                 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
1873
1874                 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
1875
1876                 asoc->str_reset_seq_in = asoc->init_seq_number;
1877
1878                 asoc->advanced_peer_ack_point = asoc->last_acked_seq;
1879                 if (asoc->mapping_array) {
1880                         memset(asoc->mapping_array, 0,
1881                             asoc->mapping_array_size);
1882                 }
1883                 if (asoc->nr_mapping_array) {
1884                         memset(asoc->nr_mapping_array, 0,
1885                             asoc->mapping_array_size);
1886                 }
1887                 SCTP_TCB_UNLOCK(stcb);
1888                 SCTP_INP_INFO_WLOCK();
1889                 SCTP_INP_WLOCK(stcb->sctp_ep);
1890                 SCTP_TCB_LOCK(stcb);
1891                 atomic_add_int(&stcb->asoc.refcnt, -1);
1892                 /* send up all the data */
1893                 SCTP_TCB_SEND_LOCK(stcb);
1894
1895                 sctp_report_all_outbound(stcb, 0, 1, SCTP_SO_NOT_LOCKED);
1896                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
1897                         stcb->asoc.strmout[i].stream_no = i;
1898                         stcb->asoc.strmout[i].next_sequence_sent = 0;
1899                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
1900                 }
1901                 /* process the INIT-ACK info (my info) */
1902                 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
1903                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1904
1905                 /* pull from vtag hash */
1906                 LIST_REMOVE(stcb, sctp_asocs);
1907                 /* re-insert to new vtag position */
1908                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag,
1909                     SCTP_BASE_INFO(hashasocmark))];
1910                 /*
1911                  * put it in the bucket in the vtag hash of assoc's for the
1912                  * system
1913                  */
1914                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
1915
1916                 /* process the INIT info (peer's info) */
1917                 SCTP_TCB_SEND_UNLOCK(stcb);
1918                 SCTP_INP_WUNLOCK(stcb->sctp_ep);
1919                 SCTP_INP_INFO_WUNLOCK();
1920
1921                 retval = sctp_process_init(init_cp, stcb);
1922                 if (retval < 0) {
1923                         if (how_indx < sizeof(asoc->cookie_how))
1924                                 asoc->cookie_how[how_indx] = 13;
1925
1926                         return (NULL);
1927                 }
1928                 /*
1929                  * since we did not send a HB make sure we don't double
1930                  * things
1931                  */
1932                 net->hb_responded = 1;
1933
1934                 if (sctp_load_addresses_from_init(stcb, m,
1935                     init_offset + sizeof(struct sctp_init_chunk),
1936                     initack_offset, sh, init_src)) {
1937                         if (how_indx < sizeof(asoc->cookie_how))
1938                                 asoc->cookie_how[how_indx] = 14;
1939
1940                         return (NULL);
1941                 }
1942                 /* respond with a COOKIE-ACK */
1943                 sctp_stop_all_cookie_timers(stcb);
1944                 sctp_toss_old_cookies(stcb, asoc);
1945                 sctp_send_cookie_ack(stcb);
1946                 if (how_indx < sizeof(asoc->cookie_how))
1947                         asoc->cookie_how[how_indx] = 15;
1948
1949                 return (stcb);
1950         }
1951         if (how_indx < sizeof(asoc->cookie_how))
1952                 asoc->cookie_how[how_indx] = 16;
1953         /* all other cases... */
1954         return (NULL);
1955 }
1956
1957
1958 /*
1959  * handle a state cookie for a new association m: input packet mbuf chain--
1960  * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf
1961  * and the cookie signature does not exist offset: offset into mbuf to the
1962  * cookie-echo chunk length: length of the cookie chunk to: where the init
1963  * was from returns a new TCB
1964  */
1965 struct sctp_tcb *
1966 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
1967     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1968     struct sctp_inpcb *inp, struct sctp_nets **netp,
1969     struct sockaddr *init_src, int *notification,
1970     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1971     uint32_t vrf_id, uint16_t port)
1972 {
1973         struct sctp_tcb *stcb;
1974         struct sctp_init_chunk *init_cp, init_buf;
1975         struct sctp_init_ack_chunk *initack_cp, initack_buf;
1976         struct sockaddr_storage sa_store;
1977         struct sockaddr *initack_src = (struct sockaddr *)&sa_store;
1978         struct sctp_association *asoc;
1979         int init_offset, initack_offset, initack_limit;
1980         int retval;
1981         int error = 0;
1982         uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE];
1983
1984 #ifdef INET
1985         struct sockaddr_in *sin;
1986
1987 #endif
1988 #ifdef INET6
1989         struct sockaddr_in6 *sin6;
1990
1991 #endif
1992 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1993         struct socket *so;
1994
1995         so = SCTP_INP_SO(inp);
1996 #endif
1997
1998         /*
1999          * find and validate the INIT chunk in the cookie (peer's info) the
2000          * INIT should start after the cookie-echo header struct (chunk
2001          * header, state cookie header struct)
2002          */
2003         init_offset = offset + sizeof(struct sctp_cookie_echo_chunk);
2004         init_cp = (struct sctp_init_chunk *)
2005             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
2006             (uint8_t *) & init_buf);
2007         if (init_cp == NULL) {
2008                 /* could not pull a INIT chunk in cookie */
2009                 SCTPDBG(SCTP_DEBUG_INPUT1,
2010                     "process_cookie_new: could not pull INIT chunk hdr\n");
2011                 return (NULL);
2012         }
2013         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
2014                 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n");
2015                 return (NULL);
2016         }
2017         initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
2018         /*
2019          * find and validate the INIT-ACK chunk in the cookie (my info) the
2020          * INIT-ACK follows the INIT chunk
2021          */
2022         initack_cp = (struct sctp_init_ack_chunk *)
2023             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
2024             (uint8_t *) & initack_buf);
2025         if (initack_cp == NULL) {
2026                 /* could not pull INIT-ACK chunk in cookie */
2027                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n");
2028                 return (NULL);
2029         }
2030         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
2031                 return (NULL);
2032         }
2033         /*
2034          * NOTE: We can't use the INIT_ACK's chk_length to determine the
2035          * "initack_limit" value.  This is because the chk_length field
2036          * includes the length of the cookie, but the cookie is omitted when
2037          * the INIT and INIT_ACK are tacked onto the cookie...
2038          */
2039         initack_limit = offset + cookie_len;
2040
2041         /*
2042          * now that we know the INIT/INIT-ACK are in place, create a new TCB
2043          * and popluate
2044          */
2045
2046         /*
2047          * Here we do a trick, we set in NULL for the proc/thread argument.
2048          * We do this since in effect we only use the p argument when the
2049          * socket is unbound and we must do an implicit bind. Since we are
2050          * getting a cookie, we cannot be unbound.
2051          */
2052         stcb = sctp_aloc_assoc(inp, init_src, &error,
2053             ntohl(initack_cp->init.initiate_tag), vrf_id,
2054             (struct thread *)NULL
2055             );
2056         if (stcb == NULL) {
2057                 struct mbuf *op_err;
2058
2059                 /* memory problem? */
2060                 SCTPDBG(SCTP_DEBUG_INPUT1,
2061                     "process_cookie_new: no room for another TCB!\n");
2062                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC);
2063
2064                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2065                     sh, op_err, vrf_id, port);
2066                 return (NULL);
2067         }
2068         /* get the correct sctp_nets */
2069         if (netp)
2070                 *netp = sctp_findnet(stcb, init_src);
2071
2072         asoc = &stcb->asoc;
2073         /* get scope variables out of cookie */
2074         asoc->ipv4_local_scope = cookie->ipv4_scope;
2075         asoc->site_scope = cookie->site_scope;
2076         asoc->local_scope = cookie->local_scope;
2077         asoc->loopback_scope = cookie->loopback_scope;
2078
2079         if ((asoc->ipv4_addr_legal != cookie->ipv4_addr_legal) ||
2080             (asoc->ipv6_addr_legal != cookie->ipv6_addr_legal)) {
2081                 struct mbuf *op_err;
2082
2083                 /*
2084                  * Houston we have a problem. The EP changed while the
2085                  * cookie was in flight. Only recourse is to abort the
2086                  * association.
2087                  */
2088                 atomic_add_int(&stcb->asoc.refcnt, 1);
2089                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC);
2090                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2091                     sh, op_err, vrf_id, port);
2092 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2093                 SCTP_TCB_UNLOCK(stcb);
2094                 SCTP_SOCKET_LOCK(so, 1);
2095                 SCTP_TCB_LOCK(stcb);
2096 #endif
2097                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2098                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
2099 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2100                 SCTP_SOCKET_UNLOCK(so, 1);
2101 #endif
2102                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2103                 return (NULL);
2104         }
2105         /* process the INIT-ACK info (my info) */
2106         asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
2107         asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
2108         asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
2109         asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
2110         asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
2111         asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
2112         asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
2113         asoc->str_reset_seq_in = asoc->init_seq_number;
2114
2115         asoc->advanced_peer_ack_point = asoc->last_acked_seq;
2116
2117         /* process the INIT info (peer's info) */
2118         if (netp)
2119                 retval = sctp_process_init(init_cp, stcb);
2120         else
2121                 retval = 0;
2122         if (retval < 0) {
2123                 atomic_add_int(&stcb->asoc.refcnt, 1);
2124 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2125                 SCTP_TCB_UNLOCK(stcb);
2126                 SCTP_SOCKET_LOCK(so, 1);
2127                 SCTP_TCB_LOCK(stcb);
2128 #endif
2129                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
2130 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2131                 SCTP_SOCKET_UNLOCK(so, 1);
2132 #endif
2133                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2134                 return (NULL);
2135         }
2136         /* load all addresses */
2137         if (sctp_load_addresses_from_init(stcb, m,
2138             init_offset + sizeof(struct sctp_init_chunk), initack_offset, sh,
2139             init_src)) {
2140                 atomic_add_int(&stcb->asoc.refcnt, 1);
2141 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2142                 SCTP_TCB_UNLOCK(stcb);
2143                 SCTP_SOCKET_LOCK(so, 1);
2144                 SCTP_TCB_LOCK(stcb);
2145 #endif
2146                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_17);
2147 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2148                 SCTP_SOCKET_UNLOCK(so, 1);
2149 #endif
2150                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2151                 return (NULL);
2152         }
2153         /*
2154          * verify any preceding AUTH chunk that was skipped
2155          */
2156         /* pull the local authentication parameters from the cookie/init-ack */
2157         sctp_auth_get_cookie_params(stcb, m,
2158             initack_offset + sizeof(struct sctp_init_ack_chunk),
2159             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)));
2160         if (auth_skipped) {
2161                 struct sctp_auth_chunk *auth;
2162
2163                 auth = (struct sctp_auth_chunk *)
2164                     sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf);
2165                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) {
2166                         /* auth HMAC failed, dump the assoc and packet */
2167                         SCTPDBG(SCTP_DEBUG_AUTH1,
2168                             "COOKIE-ECHO: AUTH failed\n");
2169                         atomic_add_int(&stcb->asoc.refcnt, 1);
2170 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2171                         SCTP_TCB_UNLOCK(stcb);
2172                         SCTP_SOCKET_LOCK(so, 1);
2173                         SCTP_TCB_LOCK(stcb);
2174 #endif
2175                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_18);
2176 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2177                         SCTP_SOCKET_UNLOCK(so, 1);
2178 #endif
2179                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
2180                         return (NULL);
2181                 } else {
2182                         /* remaining chunks checked... good to go */
2183                         stcb->asoc.authenticated = 1;
2184                 }
2185         }
2186         /* update current state */
2187         SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2188         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
2189         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2190                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2191                     stcb->sctp_ep, stcb, asoc->primary_destination);
2192         }
2193         sctp_stop_all_cookie_timers(stcb);
2194         SCTP_STAT_INCR_COUNTER32(sctps_passiveestab);
2195         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2196
2197         /*
2198          * if we're doing ASCONFs, check to see if we have any new local
2199          * addresses that need to get added to the peer (eg. addresses
2200          * changed while cookie echo in flight).  This needs to be done
2201          * after we go to the OPEN state to do the correct asconf
2202          * processing. else, make sure we have the correct addresses in our
2203          * lists
2204          */
2205
2206         /* warning, we re-use sin, sin6, sa_store here! */
2207         /* pull in local_address (our "from" address) */
2208         switch (cookie->laddr_type) {
2209 #ifdef INET
2210         case SCTP_IPV4_ADDRESS:
2211                 /* source addr is IPv4 */
2212                 sin = (struct sockaddr_in *)initack_src;
2213                 memset(sin, 0, sizeof(*sin));
2214                 sin->sin_family = AF_INET;
2215                 sin->sin_len = sizeof(struct sockaddr_in);
2216                 sin->sin_addr.s_addr = cookie->laddress[0];
2217                 break;
2218 #endif
2219 #ifdef INET6
2220         case SCTP_IPV6_ADDRESS:
2221                 /* source addr is IPv6 */
2222                 sin6 = (struct sockaddr_in6 *)initack_src;
2223                 memset(sin6, 0, sizeof(*sin6));
2224                 sin6->sin6_family = AF_INET6;
2225                 sin6->sin6_len = sizeof(struct sockaddr_in6);
2226                 sin6->sin6_scope_id = cookie->scope_id;
2227                 memcpy(&sin6->sin6_addr, cookie->laddress,
2228                     sizeof(sin6->sin6_addr));
2229                 break;
2230 #endif
2231         default:
2232                 atomic_add_int(&stcb->asoc.refcnt, 1);
2233 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2234                 SCTP_TCB_UNLOCK(stcb);
2235                 SCTP_SOCKET_LOCK(so, 1);
2236                 SCTP_TCB_LOCK(stcb);
2237 #endif
2238                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_19);
2239 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2240                 SCTP_SOCKET_UNLOCK(so, 1);
2241 #endif
2242                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2243                 return (NULL);
2244         }
2245
2246         /* set up to notify upper layer */
2247         *notification = SCTP_NOTIFY_ASSOC_UP;
2248         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2249             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
2250             (inp->sctp_socket->so_qlimit == 0)) {
2251                 /*
2252                  * This is an endpoint that called connect() how it got a
2253                  * cookie that is NEW is a bit of a mystery. It must be that
2254                  * the INIT was sent, but before it got there.. a complete
2255                  * INIT/INIT-ACK/COOKIE arrived. But of course then it
2256                  * should have went to the other code.. not here.. oh well..
2257                  * a bit of protection is worth having..
2258                  */
2259                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2260 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2261                 atomic_add_int(&stcb->asoc.refcnt, 1);
2262                 SCTP_TCB_UNLOCK(stcb);
2263                 SCTP_SOCKET_LOCK(so, 1);
2264                 SCTP_TCB_LOCK(stcb);
2265                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2266                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
2267                         SCTP_SOCKET_UNLOCK(so, 1);
2268                         return (NULL);
2269                 }
2270 #endif
2271                 soisconnected(stcb->sctp_socket);
2272 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2273                 SCTP_SOCKET_UNLOCK(so, 1);
2274 #endif
2275         } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
2276             (inp->sctp_socket->so_qlimit)) {
2277                 /*
2278                  * We don't want to do anything with this one. Since it is
2279                  * the listening guy. The timer will get started for
2280                  * accepted connections in the caller.
2281                  */
2282                 ;
2283         }
2284         /* since we did not send a HB make sure we don't double things */
2285         if ((netp) && (*netp))
2286                 (*netp)->hb_responded = 1;
2287
2288         if (stcb->asoc.sctp_autoclose_ticks &&
2289             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2290                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL);
2291         }
2292         /* calculate the RTT */
2293         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
2294         if ((netp) && (*netp)) {
2295                 (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp,
2296                     &cookie->time_entered, sctp_align_unsafe_makecopy,
2297                     SCTP_RTT_FROM_NON_DATA);
2298         }
2299         /* respond with a COOKIE-ACK */
2300         sctp_send_cookie_ack(stcb);
2301
2302         /*
2303          * check the address lists for any ASCONFs that need to be sent
2304          * AFTER the cookie-ack is sent
2305          */
2306         sctp_check_address_list(stcb, m,
2307             initack_offset + sizeof(struct sctp_init_ack_chunk),
2308             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)),
2309             initack_src, cookie->local_scope, cookie->site_scope,
2310             cookie->ipv4_scope, cookie->loopback_scope);
2311
2312
2313         return (stcb);
2314 }
2315
2316 /*
2317  * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e
2318  * we NEED to make sure we are not already using the vtag. If so we
2319  * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit!
2320         head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag,
2321                                                             SCTP_BASE_INFO(hashasocmark))];
2322         LIST_FOREACH(stcb, head, sctp_asocs) {
2323                 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep))  {
2324                        -- SEND ABORT - TRY AGAIN --
2325                 }
2326         }
2327 */
2328
2329 /*
2330  * handles a COOKIE-ECHO message stcb: modified to either a new or left as
2331  * existing (non-NULL) TCB
2332  */
2333 static struct mbuf *
2334 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset,
2335     struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp,
2336     struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp,
2337     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
2338     struct sctp_tcb **locked_tcb, uint32_t vrf_id, uint16_t port)
2339 {
2340         struct sctp_state_cookie *cookie;
2341         struct sctp_tcb *l_stcb = *stcb;
2342         struct sctp_inpcb *l_inp;
2343         struct sockaddr *to;
2344         struct sctp_pcb *ep;
2345         struct mbuf *m_sig;
2346         uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE];
2347         uint8_t *sig;
2348         uint8_t cookie_ok = 0;
2349         unsigned int size_of_pkt, sig_offset, cookie_offset;
2350         unsigned int cookie_len;
2351         struct timeval now;
2352         struct timeval time_expires;
2353         struct sockaddr_storage dest_store;
2354         struct sockaddr *localep_sa = (struct sockaddr *)&dest_store;
2355         struct ip *iph;
2356         int notification = 0;
2357         struct sctp_nets *netl;
2358         int had_a_existing_tcb = 0;
2359         int send_int_conf = 0;
2360
2361 #ifdef INET
2362         struct sockaddr_in sin;
2363
2364 #endif
2365 #ifdef INET6
2366         struct sockaddr_in6 sin6;
2367
2368 #endif
2369
2370         SCTPDBG(SCTP_DEBUG_INPUT2,
2371             "sctp_handle_cookie: handling COOKIE-ECHO\n");
2372
2373         if (inp_p == NULL) {
2374                 return (NULL);
2375         }
2376         /* First get the destination address setup too. */
2377         iph = mtod(m, struct ip *);
2378         switch (iph->ip_v) {
2379 #ifdef INET
2380         case IPVERSION:
2381                 {
2382                         /* its IPv4 */
2383                         struct sockaddr_in *lsin;
2384
2385                         lsin = (struct sockaddr_in *)(localep_sa);
2386                         memset(lsin, 0, sizeof(*lsin));
2387                         lsin->sin_family = AF_INET;
2388                         lsin->sin_len = sizeof(*lsin);
2389                         lsin->sin_port = sh->dest_port;
2390                         lsin->sin_addr.s_addr = iph->ip_dst.s_addr;
2391                         size_of_pkt = SCTP_GET_IPV4_LENGTH(iph);
2392                         break;
2393                 }
2394 #endif
2395 #ifdef INET6
2396         case IPV6_VERSION >> 4:
2397                 {
2398                         /* its IPv6 */
2399                         struct ip6_hdr *ip6;
2400                         struct sockaddr_in6 *lsin6;
2401
2402                         lsin6 = (struct sockaddr_in6 *)(localep_sa);
2403                         memset(lsin6, 0, sizeof(*lsin6));
2404                         lsin6->sin6_family = AF_INET6;
2405                         lsin6->sin6_len = sizeof(struct sockaddr_in6);
2406                         ip6 = mtod(m, struct ip6_hdr *);
2407                         lsin6->sin6_port = sh->dest_port;
2408                         lsin6->sin6_addr = ip6->ip6_dst;
2409                         size_of_pkt = SCTP_GET_IPV6_LENGTH(ip6) + iphlen;
2410                         break;
2411                 }
2412 #endif
2413         default:
2414                 return (NULL);
2415         }
2416
2417         cookie = &cp->cookie;
2418         cookie_offset = offset + sizeof(struct sctp_chunkhdr);
2419         cookie_len = ntohs(cp->ch.chunk_length);
2420
2421         if ((cookie->peerport != sh->src_port) &&
2422             (cookie->myport != sh->dest_port) &&
2423             (cookie->my_vtag != sh->v_tag)) {
2424                 /*
2425                  * invalid ports or bad tag.  Note that we always leave the
2426                  * v_tag in the header in network order and when we stored
2427                  * it in the my_vtag slot we also left it in network order.
2428                  * This maintains the match even though it may be in the
2429                  * opposite byte order of the machine :->
2430                  */
2431                 return (NULL);
2432         }
2433         if (cookie_len > size_of_pkt ||
2434             cookie_len < sizeof(struct sctp_cookie_echo_chunk) +
2435             sizeof(struct sctp_init_chunk) +
2436             sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) {
2437                 /* cookie too long!  or too small */
2438                 return (NULL);
2439         }
2440         /*
2441          * split off the signature into its own mbuf (since it should not be
2442          * calculated in the sctp_hmac_m() call).
2443          */
2444         sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE;
2445         if (sig_offset > size_of_pkt) {
2446                 /* packet not correct size! */
2447                 /* XXX this may already be accounted for earlier... */
2448                 return (NULL);
2449         }
2450         m_sig = m_split(m, sig_offset, M_DONTWAIT);
2451         if (m_sig == NULL) {
2452                 /* out of memory or ?? */
2453                 return (NULL);
2454         }
2455 #ifdef SCTP_MBUF_LOGGING
2456         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
2457                 struct mbuf *mat;
2458
2459                 for (mat = m_sig; mat; mat = SCTP_BUF_NEXT(mat)) {
2460                         if (SCTP_BUF_IS_EXTENDED(mat)) {
2461                                 sctp_log_mb(mat, SCTP_MBUF_SPLIT);
2462                         }
2463                 }
2464         }
2465 #endif
2466
2467         /*
2468          * compute the signature/digest for the cookie
2469          */
2470         ep = &(*inp_p)->sctp_ep;
2471         l_inp = *inp_p;
2472         if (l_stcb) {
2473                 SCTP_TCB_UNLOCK(l_stcb);
2474         }
2475         SCTP_INP_RLOCK(l_inp);
2476         if (l_stcb) {
2477                 SCTP_TCB_LOCK(l_stcb);
2478         }
2479         /* which cookie is it? */
2480         if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) &&
2481             (ep->current_secret_number != ep->last_secret_number)) {
2482                 /* it's the old cookie */
2483                 (void)sctp_hmac_m(SCTP_HMAC,
2484                     (uint8_t *) ep->secret_key[(int)ep->last_secret_number],
2485                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2486         } else {
2487                 /* it's the current cookie */
2488                 (void)sctp_hmac_m(SCTP_HMAC,
2489                     (uint8_t *) ep->secret_key[(int)ep->current_secret_number],
2490                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2491         }
2492         /* get the signature */
2493         SCTP_INP_RUNLOCK(l_inp);
2494         sig = (uint8_t *) sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *) & tmp_sig);
2495         if (sig == NULL) {
2496                 /* couldn't find signature */
2497                 sctp_m_freem(m_sig);
2498                 return (NULL);
2499         }
2500         /* compare the received digest with the computed digest */
2501         if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) {
2502                 /* try the old cookie? */
2503                 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) &&
2504                     (ep->current_secret_number != ep->last_secret_number)) {
2505                         /* compute digest with old */
2506                         (void)sctp_hmac_m(SCTP_HMAC,
2507                             (uint8_t *) ep->secret_key[(int)ep->last_secret_number],
2508                             SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2509                         /* compare */
2510                         if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0)
2511                                 cookie_ok = 1;
2512                 }
2513         } else {
2514                 cookie_ok = 1;
2515         }
2516
2517         /*
2518          * Now before we continue we must reconstruct our mbuf so that
2519          * normal processing of any other chunks will work.
2520          */
2521         {
2522                 struct mbuf *m_at;
2523
2524                 m_at = m;
2525                 while (SCTP_BUF_NEXT(m_at) != NULL) {
2526                         m_at = SCTP_BUF_NEXT(m_at);
2527                 }
2528                 SCTP_BUF_NEXT(m_at) = m_sig;
2529         }
2530
2531         if (cookie_ok == 0) {
2532                 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n");
2533                 SCTPDBG(SCTP_DEBUG_INPUT2,
2534                     "offset = %u, cookie_offset = %u, sig_offset = %u\n",
2535                     (uint32_t) offset, cookie_offset, sig_offset);
2536                 return (NULL);
2537         }
2538         /*
2539          * check the cookie timestamps to be sure it's not stale
2540          */
2541         (void)SCTP_GETTIME_TIMEVAL(&now);
2542         /* Expire time is in Ticks, so we convert to seconds */
2543         time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life);
2544         time_expires.tv_usec = cookie->time_entered.tv_usec;
2545         /*
2546          * TODO sctp_constants.h needs alternative time macros when _KERNEL
2547          * is undefined.
2548          */
2549         if (timevalcmp(&now, &time_expires, >)) {
2550                 /* cookie is stale! */
2551                 struct mbuf *op_err;
2552                 struct sctp_stale_cookie_msg *scm;
2553                 uint32_t tim;
2554
2555                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_stale_cookie_msg),
2556                     0, M_DONTWAIT, 1, MT_DATA);
2557                 if (op_err == NULL) {
2558                         /* FOOBAR */
2559                         return (NULL);
2560                 }
2561                 /* Set the len */
2562                 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_stale_cookie_msg);
2563                 scm = mtod(op_err, struct sctp_stale_cookie_msg *);
2564                 scm->ph.param_type = htons(SCTP_CAUSE_STALE_COOKIE);
2565                 scm->ph.param_length = htons((sizeof(struct sctp_paramhdr) +
2566                     (sizeof(uint32_t))));
2567                 /* seconds to usec */
2568                 tim = (now.tv_sec - time_expires.tv_sec) * 1000000;
2569                 /* add in usec */
2570                 if (tim == 0)
2571                         tim = now.tv_usec - cookie->time_entered.tv_usec;
2572                 scm->time_usec = htonl(tim);
2573                 sctp_send_operr_to(m, iphlen, op_err, cookie->peers_vtag,
2574                     vrf_id, port);
2575                 return (NULL);
2576         }
2577         /*
2578          * Now we must see with the lookup address if we have an existing
2579          * asoc. This will only happen if we were in the COOKIE-WAIT state
2580          * and a INIT collided with us and somewhere the peer sent the
2581          * cookie on another address besides the single address our assoc
2582          * had for him. In this case we will have one of the tie-tags set at
2583          * least AND the address field in the cookie can be used to look it
2584          * up.
2585          */
2586         to = NULL;
2587         switch (cookie->addr_type) {
2588 #ifdef INET6
2589         case SCTP_IPV6_ADDRESS:
2590                 memset(&sin6, 0, sizeof(sin6));
2591                 sin6.sin6_family = AF_INET6;
2592                 sin6.sin6_len = sizeof(sin6);
2593                 sin6.sin6_port = sh->src_port;
2594                 sin6.sin6_scope_id = cookie->scope_id;
2595                 memcpy(&sin6.sin6_addr.s6_addr, cookie->address,
2596                     sizeof(sin6.sin6_addr.s6_addr));
2597                 to = (struct sockaddr *)&sin6;
2598                 break;
2599 #endif
2600 #ifdef INET
2601         case SCTP_IPV4_ADDRESS:
2602                 memset(&sin, 0, sizeof(sin));
2603                 sin.sin_family = AF_INET;
2604                 sin.sin_len = sizeof(sin);
2605                 sin.sin_port = sh->src_port;
2606                 sin.sin_addr.s_addr = cookie->address[0];
2607                 to = (struct sockaddr *)&sin;
2608                 break;
2609 #endif
2610         default:
2611                 /* This should not happen */
2612                 return (NULL);
2613         }
2614         if ((*stcb == NULL) && to) {
2615                 /* Yep, lets check */
2616                 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, localep_sa, NULL);
2617                 if (*stcb == NULL) {
2618                         /*
2619                          * We should have only got back the same inp. If we
2620                          * got back a different ep we have a problem. The
2621                          * original findep got back l_inp and now
2622                          */
2623                         if (l_inp != *inp_p) {
2624                                 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n");
2625                         }
2626                 } else {
2627                         if (*locked_tcb == NULL) {
2628                                 /*
2629                                  * In this case we found the assoc only
2630                                  * after we locked the create lock. This
2631                                  * means we are in a colliding case and we
2632                                  * must make sure that we unlock the tcb if
2633                                  * its one of the cases where we throw away
2634                                  * the incoming packets.
2635                                  */
2636                                 *locked_tcb = *stcb;
2637
2638                                 /*
2639                                  * We must also increment the inp ref count
2640                                  * since the ref_count flags was set when we
2641                                  * did not find the TCB, now we found it
2642                                  * which reduces the refcount.. we must
2643                                  * raise it back out to balance it all :-)
2644                                  */
2645                                 SCTP_INP_INCR_REF((*stcb)->sctp_ep);
2646                                 if ((*stcb)->sctp_ep != l_inp) {
2647                                         SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n",
2648                                             (*stcb)->sctp_ep, l_inp);
2649                                 }
2650                         }
2651                 }
2652         }
2653         if (to == NULL) {
2654                 return (NULL);
2655         }
2656         cookie_len -= SCTP_SIGNATURE_SIZE;
2657         if (*stcb == NULL) {
2658                 /* this is the "normal" case... get a new TCB */
2659                 *stcb = sctp_process_cookie_new(m, iphlen, offset, sh, cookie,
2660                     cookie_len, *inp_p, netp, to, &notification,
2661                     auth_skipped, auth_offset, auth_len, vrf_id, port);
2662         } else {
2663                 /* this is abnormal... cookie-echo on existing TCB */
2664                 had_a_existing_tcb = 1;
2665                 *stcb = sctp_process_cookie_existing(m, iphlen, offset, sh,
2666                     cookie, cookie_len, *inp_p, *stcb, netp, to,
2667                     &notification, vrf_id, auth_skipped, auth_offset, auth_len, port);
2668         }
2669
2670         if (*stcb == NULL) {
2671                 /* still no TCB... must be bad cookie-echo */
2672                 return (NULL);
2673         }
2674         if ((*netp != NULL) && (m->m_flags & M_FLOWID)) {
2675                 (*netp)->flowid = m->m_pkthdr.flowid;
2676 #ifdef INVARIANTS
2677                 (*netp)->flowidset = 1;
2678 #endif
2679         }
2680         /*
2681          * Ok, we built an association so confirm the address we sent the
2682          * INIT-ACK to.
2683          */
2684         netl = sctp_findnet(*stcb, to);
2685         /*
2686          * This code should in theory NOT run but
2687          */
2688         if (netl == NULL) {
2689                 /* TSNH! Huh, why do I need to add this address here? */
2690                 if (sctp_add_remote_addr(*stcb, to, NULL, SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) {
2691                         return (NULL);
2692                 }
2693                 netl = sctp_findnet(*stcb, to);
2694         }
2695         if (netl) {
2696                 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) {
2697                         netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
2698                         (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL,
2699                             netl);
2700                         send_int_conf = 1;
2701                 }
2702         }
2703         sctp_start_net_timers(*stcb);
2704         if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
2705                 if (!had_a_existing_tcb ||
2706                     (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
2707                         /*
2708                          * If we have a NEW cookie or the connect never
2709                          * reached the connected state during collision we
2710                          * must do the TCP accept thing.
2711                          */
2712                         struct socket *so, *oso;
2713                         struct sctp_inpcb *inp;
2714
2715                         if (notification == SCTP_NOTIFY_ASSOC_RESTART) {
2716                                 /*
2717                                  * For a restart we will keep the same
2718                                  * socket, no need to do anything. I THINK!!
2719                                  */
2720                                 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2721                                 if (send_int_conf) {
2722                                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2723                                             (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2724                                 }
2725                                 return (m);
2726                         }
2727                         oso = (*inp_p)->sctp_socket;
2728                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2729                         SCTP_TCB_UNLOCK((*stcb));
2730                         CURVNET_SET(oso->so_vnet);
2731                         so = sonewconn(oso, 0
2732                             );
2733                         CURVNET_RESTORE();
2734                         SCTP_TCB_LOCK((*stcb));
2735                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2736
2737                         if (so == NULL) {
2738                                 struct mbuf *op_err;
2739
2740 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2741                                 struct socket *pcb_so;
2742
2743 #endif
2744                                 /* Too many sockets */
2745                                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n");
2746                                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC);
2747                                 sctp_abort_association(*inp_p, NULL, m, iphlen,
2748                                     sh, op_err, vrf_id, port);
2749 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2750                                 pcb_so = SCTP_INP_SO(*inp_p);
2751                                 atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2752                                 SCTP_TCB_UNLOCK((*stcb));
2753                                 SCTP_SOCKET_LOCK(pcb_so, 1);
2754                                 SCTP_TCB_LOCK((*stcb));
2755                                 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2756 #endif
2757                                 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_20);
2758 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2759                                 SCTP_SOCKET_UNLOCK(pcb_so, 1);
2760 #endif
2761                                 return (NULL);
2762                         }
2763                         inp = (struct sctp_inpcb *)so->so_pcb;
2764                         SCTP_INP_INCR_REF(inp);
2765                         /*
2766                          * We add the unbound flag here so that if we get an
2767                          * soabort() before we get the move_pcb done, we
2768                          * will properly cleanup.
2769                          */
2770                         inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE |
2771                             SCTP_PCB_FLAGS_CONNECTED |
2772                             SCTP_PCB_FLAGS_IN_TCPPOOL |
2773                             SCTP_PCB_FLAGS_UNBOUND |
2774                             (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) |
2775                             SCTP_PCB_FLAGS_DONT_WAKE);
2776                         inp->sctp_features = (*inp_p)->sctp_features;
2777                         inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features;
2778                         inp->sctp_socket = so;
2779                         inp->sctp_frag_point = (*inp_p)->sctp_frag_point;
2780                         inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off;
2781                         inp->sctp_ecn_enable = (*inp_p)->sctp_ecn_enable;
2782                         inp->partial_delivery_point = (*inp_p)->partial_delivery_point;
2783                         inp->sctp_context = (*inp_p)->sctp_context;
2784                         inp->local_strreset_support = (*inp_p)->local_strreset_support;
2785                         inp->inp_starting_point_for_iterator = NULL;
2786                         /*
2787                          * copy in the authentication parameters from the
2788                          * original endpoint
2789                          */
2790                         if (inp->sctp_ep.local_hmacs)
2791                                 sctp_free_hmaclist(inp->sctp_ep.local_hmacs);
2792                         inp->sctp_ep.local_hmacs =
2793                             sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs);
2794                         if (inp->sctp_ep.local_auth_chunks)
2795                                 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks);
2796                         inp->sctp_ep.local_auth_chunks =
2797                             sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks);
2798
2799                         /*
2800                          * Now we must move it from one hash table to
2801                          * another and get the tcb in the right place.
2802                          */
2803
2804                         /*
2805                          * This is where the one-2-one socket is put into
2806                          * the accept state waiting for the accept!
2807                          */
2808                         if (*stcb) {
2809                                 (*stcb)->asoc.state |= SCTP_STATE_IN_ACCEPT_QUEUE;
2810                         }
2811                         sctp_move_pcb_and_assoc(*inp_p, inp, *stcb);
2812
2813                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2814                         SCTP_TCB_UNLOCK((*stcb));
2815
2816                         sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb,
2817                             0);
2818                         SCTP_TCB_LOCK((*stcb));
2819                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2820
2821
2822                         /*
2823                          * now we must check to see if we were aborted while
2824                          * the move was going on and the lock/unlock
2825                          * happened.
2826                          */
2827                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
2828                                 /*
2829                                  * yep it was, we leave the assoc attached
2830                                  * to the socket since the sctp_inpcb_free()
2831                                  * call will send an abort for us.
2832                                  */
2833                                 SCTP_INP_DECR_REF(inp);
2834                                 return (NULL);
2835                         }
2836                         SCTP_INP_DECR_REF(inp);
2837                         /* Switch over to the new guy */
2838                         *inp_p = inp;
2839                         sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2840                         if (send_int_conf) {
2841                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2842                                     (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2843                         }
2844                         /*
2845                          * Pull it from the incomplete queue and wake the
2846                          * guy
2847                          */
2848 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2849                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2850                         SCTP_TCB_UNLOCK((*stcb));
2851                         SCTP_SOCKET_LOCK(so, 1);
2852 #endif
2853                         soisconnected(so);
2854 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2855                         SCTP_TCB_LOCK((*stcb));
2856                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2857                         SCTP_SOCKET_UNLOCK(so, 1);
2858 #endif
2859                         return (m);
2860                 }
2861         }
2862         if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE) {
2863                 if (notification) {
2864                         sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2865                 }
2866                 if (send_int_conf) {
2867                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2868                             (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2869                 }
2870         }
2871         return (m);
2872 }
2873
2874 static void
2875 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED,
2876     struct sctp_tcb *stcb, struct sctp_nets *net)
2877 {
2878         /* cp must not be used, others call this without a c-ack :-) */
2879         struct sctp_association *asoc;
2880
2881         SCTPDBG(SCTP_DEBUG_INPUT2,
2882             "sctp_handle_cookie_ack: handling COOKIE-ACK\n");
2883         if (stcb == NULL)
2884                 return;
2885
2886         asoc = &stcb->asoc;
2887
2888         sctp_stop_all_cookie_timers(stcb);
2889         /* process according to association state */
2890         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) {
2891                 /* state change only needed when I am in right state */
2892                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2893                 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
2894                 sctp_start_net_timers(stcb);
2895                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2896                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2897                             stcb->sctp_ep, stcb, asoc->primary_destination);
2898
2899                 }
2900                 /* update RTO */
2901                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
2902                 SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2903                 if (asoc->overall_error_count == 0) {
2904                         net->RTO = sctp_calculate_rto(stcb, asoc, net,
2905                             &asoc->time_entered, sctp_align_safe_nocopy,
2906                             SCTP_RTT_FROM_NON_DATA);
2907                 }
2908                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
2909                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2910                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2911                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
2912 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2913                         struct socket *so;
2914
2915 #endif
2916                         stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2917 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2918                         so = SCTP_INP_SO(stcb->sctp_ep);
2919                         atomic_add_int(&stcb->asoc.refcnt, 1);
2920                         SCTP_TCB_UNLOCK(stcb);
2921                         SCTP_SOCKET_LOCK(so, 1);
2922                         SCTP_TCB_LOCK(stcb);
2923                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
2924 #endif
2925                         if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) {
2926                                 soisconnected(stcb->sctp_socket);
2927                         }
2928 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2929                         SCTP_SOCKET_UNLOCK(so, 1);
2930 #endif
2931                 }
2932                 /*
2933                  * since we did not send a HB make sure we don't double
2934                  * things
2935                  */
2936                 net->hb_responded = 1;
2937
2938                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
2939                         /*
2940                          * We don't need to do the asconf thing, nor hb or
2941                          * autoclose if the socket is closed.
2942                          */
2943                         goto closed_socket;
2944                 }
2945                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
2946                     stcb, net);
2947
2948
2949                 if (stcb->asoc.sctp_autoclose_ticks &&
2950                     sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2951                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
2952                             stcb->sctp_ep, stcb, NULL);
2953                 }
2954                 /*
2955                  * send ASCONF if parameters are pending and ASCONFs are
2956                  * allowed (eg. addresses changed when init/cookie echo were
2957                  * in flight)
2958                  */
2959                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) &&
2960                     (stcb->asoc.peer_supports_asconf) &&
2961                     (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) {
2962 #ifdef SCTP_TIMER_BASED_ASCONF
2963                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF,
2964                             stcb->sctp_ep, stcb,
2965                             stcb->asoc.primary_destination);
2966 #else
2967                         sctp_send_asconf(stcb, stcb->asoc.primary_destination,
2968                             SCTP_ADDR_NOT_LOCKED);
2969 #endif
2970                 }
2971         }
2972 closed_socket:
2973         /* Toss the cookie if I can */
2974         sctp_toss_old_cookies(stcb, asoc);
2975         if (!TAILQ_EMPTY(&asoc->sent_queue)) {
2976                 /* Restart the timer if we have pending data */
2977                 struct sctp_tmit_chunk *chk;
2978
2979                 chk = TAILQ_FIRST(&asoc->sent_queue);
2980                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
2981         }
2982 }
2983
2984 static void
2985 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp,
2986     struct sctp_tcb *stcb)
2987 {
2988         struct sctp_nets *net;
2989         struct sctp_tmit_chunk *lchk;
2990         struct sctp_ecne_chunk bkup;
2991         uint8_t override_bit;
2992         uint32_t tsn, window_data_tsn;
2993         int len;
2994         unsigned int pkt_cnt;
2995
2996         len = ntohs(cp->ch.chunk_length);
2997         if ((len != sizeof(struct sctp_ecne_chunk)) &&
2998             (len != sizeof(struct old_sctp_ecne_chunk))) {
2999                 return;
3000         }
3001         if (len == sizeof(struct old_sctp_ecne_chunk)) {
3002                 /* Its the old format */
3003                 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk));
3004                 bkup.num_pkts_since_cwr = htonl(1);
3005                 cp = &bkup;
3006         }
3007         SCTP_STAT_INCR(sctps_recvecne);
3008         tsn = ntohl(cp->tsn);
3009         pkt_cnt = ntohl(cp->num_pkts_since_cwr);
3010         lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead);
3011         if (lchk == NULL) {
3012                 window_data_tsn = stcb->asoc.sending_seq - 1;
3013         } else {
3014                 window_data_tsn = lchk->rec.data.TSN_seq;
3015         }
3016
3017         /* Find where it was sent to if possible. */
3018         net = NULL;
3019         TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) {
3020                 if (lchk->rec.data.TSN_seq == tsn) {
3021                         net = lchk->whoTo;
3022                         net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send;
3023                         break;
3024                 }
3025                 if (SCTP_TSN_GT(lchk->rec.data.TSN_seq, tsn)) {
3026                         break;
3027                 }
3028         }
3029         if (net == NULL) {
3030                 /*
3031                  * What to do. A previous send of a CWR was possibly lost.
3032                  * See how old it is, we may have it marked on the actual
3033                  * net.
3034                  */
3035                 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
3036                         if (tsn == net->last_cwr_tsn) {
3037                                 /* Found him, send it off */
3038                                 break;
3039                         }
3040                 }
3041                 if (net == NULL) {
3042                         /*
3043                          * If we reach here, we need to send a special CWR
3044                          * that says hey, we did this a long time ago and
3045                          * you lost the response.
3046                          */
3047                         net = TAILQ_FIRST(&stcb->asoc.nets);
3048                         if (net == NULL) {
3049                                 /* TSNH */
3050                                 return;
3051                         }
3052                         override_bit = SCTP_CWR_REDUCE_OVERRIDE;
3053                 } else {
3054                         override_bit = 0;
3055                 }
3056         } else {
3057                 override_bit = 0;
3058         }
3059         if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) &&
3060             ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
3061                 /*
3062                  * JRS - Use the congestion control given in the pluggable
3063                  * CC module
3064                  */
3065                 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt);
3066                 /*
3067                  * We reduce once every RTT. So we will only lower cwnd at
3068                  * the next sending seq i.e. the window_data_tsn
3069                  */
3070                 net->cwr_window_tsn = window_data_tsn;
3071                 net->ecn_ce_pkt_cnt += pkt_cnt;
3072                 net->lost_cnt = pkt_cnt;
3073                 net->last_cwr_tsn = tsn;
3074         } else {
3075                 override_bit |= SCTP_CWR_IN_SAME_WINDOW;
3076                 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) &&
3077                     ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
3078                         /*
3079                          * Another loss in the same window update how many
3080                          * marks/packets lost we have had.
3081                          */
3082                         int cnt = 1;
3083
3084                         if (pkt_cnt > net->lost_cnt) {
3085                                 /* Should be the case */
3086                                 cnt = (pkt_cnt - net->lost_cnt);
3087                                 net->ecn_ce_pkt_cnt += cnt;
3088                         }
3089                         net->lost_cnt = pkt_cnt;
3090                         net->last_cwr_tsn = tsn;
3091                         /*
3092                          * Most CC functions will ignore this call, since we
3093                          * are in-window yet of the initial CE the peer saw.
3094                          */
3095                         stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt);
3096                 }
3097         }
3098         /*
3099          * We always send a CWR this way if our previous one was lost our
3100          * peer will get an update, or if it is not time again to reduce we
3101          * still get the cwr to the peer. Note we set the override when we
3102          * could not find the TSN on the chunk or the destination network.
3103          */
3104         sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit);
3105 }
3106
3107 static void
3108 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net)
3109 {
3110         /*
3111          * Here we get a CWR from the peer. We must look in the outqueue and
3112          * make sure that we have a covered ECNE in the control chunk part.
3113          * If so remove it.
3114          */
3115         struct sctp_tmit_chunk *chk;
3116         struct sctp_ecne_chunk *ecne;
3117         int override;
3118         uint32_t cwr_tsn;
3119
3120         cwr_tsn = ntohl(cp->tsn);
3121
3122         override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE;
3123         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
3124                 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) {
3125                         continue;
3126                 }
3127                 if ((override == 0) && (chk->whoTo != net)) {
3128                         /* Must be from the right src unless override is set */
3129                         continue;
3130                 }
3131                 ecne = mtod(chk->data, struct sctp_ecne_chunk *);
3132                 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) {
3133                         /* this covers this ECNE, we can remove it */
3134                         stcb->asoc.ecn_echo_cnt_onq--;
3135                         TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk,
3136                             sctp_next);
3137                         if (chk->data) {
3138                                 sctp_m_freem(chk->data);
3139                                 chk->data = NULL;
3140                         }
3141                         stcb->asoc.ctrl_queue_cnt--;
3142                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3143                         if (override == 0) {
3144                                 break;
3145                         }
3146                 }
3147         }
3148 }
3149
3150 static void
3151 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED,
3152     struct sctp_tcb *stcb, struct sctp_nets *net)
3153 {
3154         struct sctp_association *asoc;
3155
3156 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3157         struct socket *so;
3158
3159 #endif
3160
3161         SCTPDBG(SCTP_DEBUG_INPUT2,
3162             "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n");
3163         if (stcb == NULL)
3164                 return;
3165
3166         asoc = &stcb->asoc;
3167         /* process according to association state */
3168         if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
3169                 /* unexpected SHUTDOWN-COMPLETE... so ignore... */
3170                 SCTPDBG(SCTP_DEBUG_INPUT2,
3171                     "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n");
3172                 SCTP_TCB_UNLOCK(stcb);
3173                 return;
3174         }
3175         /* notify upper layer protocol */
3176         if (stcb->sctp_socket) {
3177                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
3178                 /* are the queues empty? they should be */
3179                 if (!TAILQ_EMPTY(&asoc->send_queue) ||
3180                     !TAILQ_EMPTY(&asoc->sent_queue) ||
3181                     !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
3182                         sctp_report_all_outbound(stcb, 0, 0, SCTP_SO_NOT_LOCKED);
3183                 }
3184         }
3185         /* stop the timer */
3186         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_22);
3187         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
3188         /* free the TCB */
3189         SCTPDBG(SCTP_DEBUG_INPUT2,
3190             "sctp_handle_shutdown_complete: calls free-asoc\n");
3191 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3192         so = SCTP_INP_SO(stcb->sctp_ep);
3193         atomic_add_int(&stcb->asoc.refcnt, 1);
3194         SCTP_TCB_UNLOCK(stcb);
3195         SCTP_SOCKET_LOCK(so, 1);
3196         SCTP_TCB_LOCK(stcb);
3197         atomic_subtract_int(&stcb->asoc.refcnt, 1);
3198 #endif
3199         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_23);
3200 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3201         SCTP_SOCKET_UNLOCK(so, 1);
3202 #endif
3203         return;
3204 }
3205
3206 static int
3207 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc,
3208     struct sctp_nets *net, uint8_t flg)
3209 {
3210         switch (desc->chunk_type) {
3211         case SCTP_DATA:
3212                 /* find the tsn to resend (possibly */
3213                 {
3214                         uint32_t tsn;
3215                         struct sctp_tmit_chunk *tp1;
3216
3217                         tsn = ntohl(desc->tsn_ifany);
3218                         TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3219                                 if (tp1->rec.data.TSN_seq == tsn) {
3220                                         /* found it */
3221                                         break;
3222                                 }
3223                                 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, tsn)) {
3224                                         /* not found */
3225                                         tp1 = NULL;
3226                                         break;
3227                                 }
3228                         }
3229                         if (tp1 == NULL) {
3230                                 /*
3231                                  * Do it the other way , aka without paying
3232                                  * attention to queue seq order.
3233                                  */
3234                                 SCTP_STAT_INCR(sctps_pdrpdnfnd);
3235                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3236                                         if (tp1->rec.data.TSN_seq == tsn) {
3237                                                 /* found it */
3238                                                 break;
3239                                         }
3240                                 }
3241                         }
3242                         if (tp1 == NULL) {
3243                                 SCTP_STAT_INCR(sctps_pdrptsnnf);
3244                         }
3245                         if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) {
3246                                 uint8_t *ddp;
3247
3248                                 if (((flg & SCTP_BADCRC) == 0) &&
3249                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3250                                         return (0);
3251                                 }
3252                                 if ((stcb->asoc.peers_rwnd == 0) &&
3253                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3254                                         SCTP_STAT_INCR(sctps_pdrpdiwnp);
3255                                         return (0);
3256                                 }
3257                                 if (stcb->asoc.peers_rwnd == 0 &&
3258                                     (flg & SCTP_FROM_MIDDLE_BOX)) {
3259                                         SCTP_STAT_INCR(sctps_pdrpdizrw);
3260                                         return (0);
3261                                 }
3262                                 ddp = (uint8_t *) (mtod(tp1->data, caddr_t)+
3263                                     sizeof(struct sctp_data_chunk));
3264                                 {
3265                                         unsigned int iii;
3266
3267                                         for (iii = 0; iii < sizeof(desc->data_bytes);
3268                                             iii++) {
3269                                                 if (ddp[iii] != desc->data_bytes[iii]) {
3270                                                         SCTP_STAT_INCR(sctps_pdrpbadd);
3271                                                         return (-1);
3272                                                 }
3273                                         }
3274                                 }
3275
3276                                 if (tp1->do_rtt) {
3277                                         /*
3278                                          * this guy had a RTO calculation
3279                                          * pending on it, cancel it
3280                                          */
3281                                         if (tp1->whoTo->rto_needed == 0) {
3282                                                 tp1->whoTo->rto_needed = 1;
3283                                         }
3284                                         tp1->do_rtt = 0;
3285                                 }
3286                                 SCTP_STAT_INCR(sctps_pdrpmark);
3287                                 if (tp1->sent != SCTP_DATAGRAM_RESEND)
3288                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3289                                 /*
3290                                  * mark it as if we were doing a FR, since
3291                                  * we will be getting gap ack reports behind
3292                                  * the info from the router.
3293                                  */
3294                                 tp1->rec.data.doing_fast_retransmit = 1;
3295                                 /*
3296                                  * mark the tsn with what sequences can
3297                                  * cause a new FR.
3298                                  */
3299                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) {
3300                                         tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
3301                                 } else {
3302                                         tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq;
3303                                 }
3304
3305                                 /* restart the timer */
3306                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3307                                     stcb, tp1->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_24);
3308                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3309                                     stcb, tp1->whoTo);
3310
3311                                 /* fix counts and things */
3312                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
3313                                         sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP,
3314                                             tp1->whoTo->flight_size,
3315                                             tp1->book_size,
3316                                             (uintptr_t) stcb,
3317                                             tp1->rec.data.TSN_seq);
3318                                 }
3319                                 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
3320                                         sctp_flight_size_decrease(tp1);
3321                                         sctp_total_flight_decrease(stcb, tp1);
3322                                 }
3323                                 tp1->sent = SCTP_DATAGRAM_RESEND;
3324                         } {
3325                                 /* audit code */
3326                                 unsigned int audit;
3327
3328                                 audit = 0;
3329                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3330                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3331                                                 audit++;
3332                                 }
3333                                 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue,
3334                                     sctp_next) {
3335                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3336                                                 audit++;
3337                                 }
3338                                 if (audit != stcb->asoc.sent_queue_retran_cnt) {
3339                                         SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n",
3340                                             audit, stcb->asoc.sent_queue_retran_cnt);
3341 #ifndef SCTP_AUDITING_ENABLED
3342                                         stcb->asoc.sent_queue_retran_cnt = audit;
3343 #endif
3344                                 }
3345                         }
3346                 }
3347                 break;
3348         case SCTP_ASCONF:
3349                 {
3350                         struct sctp_tmit_chunk *asconf;
3351
3352                         TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue,
3353                             sctp_next) {
3354                                 if (asconf->rec.chunk_id.id == SCTP_ASCONF) {
3355                                         break;
3356                                 }
3357                         }
3358                         if (asconf) {
3359                                 if (asconf->sent != SCTP_DATAGRAM_RESEND)
3360                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3361                                 asconf->sent = SCTP_DATAGRAM_RESEND;
3362                                 asconf->snd_count--;
3363                         }
3364                 }
3365                 break;
3366         case SCTP_INITIATION:
3367                 /* resend the INIT */
3368                 stcb->asoc.dropped_special_cnt++;
3369                 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) {
3370                         /*
3371                          * If we can get it in, in a few attempts we do
3372                          * this, otherwise we let the timer fire.
3373                          */
3374                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep,
3375                             stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_25);
3376                         sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
3377                 }
3378                 break;
3379         case SCTP_SELECTIVE_ACK:
3380         case SCTP_NR_SELECTIVE_ACK:
3381                 /* resend the sack */
3382                 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED);
3383                 break;
3384         case SCTP_HEARTBEAT_REQUEST:
3385                 /* resend a demand HB */
3386                 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) {
3387                         /*
3388                          * Only retransmit if we KNOW we wont destroy the
3389                          * tcb
3390                          */
3391                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
3392                 }
3393                 break;
3394         case SCTP_SHUTDOWN:
3395                 sctp_send_shutdown(stcb, net);
3396                 break;
3397         case SCTP_SHUTDOWN_ACK:
3398                 sctp_send_shutdown_ack(stcb, net);
3399                 break;
3400         case SCTP_COOKIE_ECHO:
3401                 {
3402                         struct sctp_tmit_chunk *cookie;
3403
3404                         cookie = NULL;
3405                         TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue,
3406                             sctp_next) {
3407                                 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
3408                                         break;
3409                                 }
3410                         }
3411                         if (cookie) {
3412                                 if (cookie->sent != SCTP_DATAGRAM_RESEND)
3413                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3414                                 cookie->sent = SCTP_DATAGRAM_RESEND;
3415                                 sctp_stop_all_cookie_timers(stcb);
3416                         }
3417                 }
3418                 break;
3419         case SCTP_COOKIE_ACK:
3420                 sctp_send_cookie_ack(stcb);
3421                 break;
3422         case SCTP_ASCONF_ACK:
3423                 /* resend last asconf ack */
3424                 sctp_send_asconf_ack(stcb);
3425                 break;
3426         case SCTP_FORWARD_CUM_TSN:
3427                 send_forward_tsn(stcb, &stcb->asoc);
3428                 break;
3429                 /* can't do anything with these */
3430         case SCTP_PACKET_DROPPED:
3431         case SCTP_INITIATION_ACK:       /* this should not happen */
3432         case SCTP_HEARTBEAT_ACK:
3433         case SCTP_ABORT_ASSOCIATION:
3434         case SCTP_OPERATION_ERROR:
3435         case SCTP_SHUTDOWN_COMPLETE:
3436         case SCTP_ECN_ECHO:
3437         case SCTP_ECN_CWR:
3438         default:
3439                 break;
3440         }
3441         return (0);
3442 }
3443
3444 void
3445 sctp_reset_in_stream(struct sctp_tcb *stcb, int number_entries, uint16_t * list)
3446 {
3447         int i;
3448         uint16_t temp;
3449
3450         /*
3451          * We set things to 0xffff since this is the last delivered sequence
3452          * and we will be sending in 0 after the reset.
3453          */
3454
3455         if (number_entries) {
3456                 for (i = 0; i < number_entries; i++) {
3457                         temp = ntohs(list[i]);
3458                         if (temp >= stcb->asoc.streamincnt) {
3459                                 continue;
3460                         }
3461                         stcb->asoc.strmin[temp].last_sequence_delivered = 0xffff;
3462                 }
3463         } else {
3464                 list = NULL;
3465                 for (i = 0; i < stcb->asoc.streamincnt; i++) {
3466                         stcb->asoc.strmin[i].last_sequence_delivered = 0xffff;
3467                 }
3468         }
3469         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3470 }
3471
3472 static void
3473 sctp_reset_out_streams(struct sctp_tcb *stcb, int number_entries, uint16_t * list)
3474 {
3475         int i;
3476
3477         if (number_entries == 0) {
3478                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3479                         stcb->asoc.strmout[i].next_sequence_sent = 0;
3480                 }
3481         } else if (number_entries) {
3482                 for (i = 0; i < number_entries; i++) {
3483                         uint16_t temp;
3484
3485                         temp = ntohs(list[i]);
3486                         if (temp >= stcb->asoc.streamoutcnt) {
3487                                 /* no such stream */
3488                                 continue;
3489                         }
3490                         stcb->asoc.strmout[temp].next_sequence_sent = 0;
3491                 }
3492         }
3493         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3494 }
3495
3496
3497 struct sctp_stream_reset_out_request *
3498 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk)
3499 {
3500         struct sctp_association *asoc;
3501         struct sctp_stream_reset_out_req *req;
3502         struct sctp_stream_reset_out_request *r;
3503         struct sctp_tmit_chunk *chk;
3504         int len, clen;
3505
3506         asoc = &stcb->asoc;
3507         if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
3508                 asoc->stream_reset_outstanding = 0;
3509                 return (NULL);
3510         }
3511         if (stcb->asoc.str_reset == NULL) {
3512                 asoc->stream_reset_outstanding = 0;
3513                 return (NULL);
3514         }
3515         chk = stcb->asoc.str_reset;
3516         if (chk->data == NULL) {
3517                 return (NULL);
3518         }
3519         if (bchk) {
3520                 /* he wants a copy of the chk pointer */
3521                 *bchk = chk;
3522         }
3523         clen = chk->send_size;
3524         req = mtod(chk->data, struct sctp_stream_reset_out_req *);
3525         r = &req->sr_req;
3526         if (ntohl(r->request_seq) == seq) {
3527                 /* found it */
3528                 return (r);
3529         }
3530         len = SCTP_SIZE32(ntohs(r->ph.param_length));
3531         if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) {
3532                 /* move to the next one, there can only be a max of two */
3533                 r = (struct sctp_stream_reset_out_request *)((caddr_t)r + len);
3534                 if (ntohl(r->request_seq) == seq) {
3535                         return (r);
3536                 }
3537         }
3538         /* that seq is not here */
3539         return (NULL);
3540 }
3541
3542 static void
3543 sctp_clean_up_stream_reset(struct sctp_tcb *stcb)
3544 {
3545         struct sctp_association *asoc;
3546         struct sctp_tmit_chunk *chk = stcb->asoc.str_reset;
3547
3548         if (stcb->asoc.str_reset == NULL) {
3549                 return;
3550         }
3551         asoc = &stcb->asoc;
3552
3553         sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_26);
3554         TAILQ_REMOVE(&asoc->control_send_queue,
3555             chk,
3556             sctp_next);
3557         if (chk->data) {
3558                 sctp_m_freem(chk->data);
3559                 chk->data = NULL;
3560         }
3561         asoc->ctrl_queue_cnt--;
3562         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3563         /* sa_ignore NO_NULL_CHK */
3564         stcb->asoc.str_reset = NULL;
3565 }
3566
3567
3568 static int
3569 sctp_handle_stream_reset_response(struct sctp_tcb *stcb,
3570     uint32_t seq, uint32_t action,
3571     struct sctp_stream_reset_response *respin)
3572 {
3573         uint16_t type;
3574         int lparm_len;
3575         struct sctp_association *asoc = &stcb->asoc;
3576         struct sctp_tmit_chunk *chk;
3577         struct sctp_stream_reset_out_request *srparam;
3578         int number_entries;
3579
3580         if (asoc->stream_reset_outstanding == 0) {
3581                 /* duplicate */
3582                 return (0);
3583         }
3584         if (seq == stcb->asoc.str_reset_seq_out) {
3585                 srparam = sctp_find_stream_reset(stcb, seq, &chk);
3586                 if (srparam) {
3587                         stcb->asoc.str_reset_seq_out++;
3588                         type = ntohs(srparam->ph.param_type);
3589                         lparm_len = ntohs(srparam->ph.param_length);
3590                         if (type == SCTP_STR_RESET_OUT_REQUEST) {
3591                                 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t);
3592                                 asoc->stream_reset_out_is_outstanding = 0;
3593                                 if (asoc->stream_reset_outstanding)
3594                                         asoc->stream_reset_outstanding--;
3595                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3596                                         /* do it */
3597                                         sctp_reset_out_streams(stcb, number_entries, srparam->list_of_streams);
3598                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3599                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED);
3600                                 } else {
3601                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED);
3602                                 }
3603                         } else if (type == SCTP_STR_RESET_IN_REQUEST) {
3604                                 /* Answered my request */
3605                                 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t);
3606                                 if (asoc->stream_reset_outstanding)
3607                                         asoc->stream_reset_outstanding--;
3608                                 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3609                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb,
3610                                             number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED);
3611                                 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3612                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb,
3613                                             number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED);
3614                                 }
3615                         } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) {
3616                                 /* Ok we now may have more streams */
3617                                 int num_stream;
3618
3619                                 num_stream = stcb->asoc.strm_pending_add_size;
3620                                 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) {
3621                                         /* TSNH */
3622                                         num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt;
3623                                 }
3624                                 stcb->asoc.strm_pending_add_size = 0;
3625                                 if (asoc->stream_reset_outstanding)
3626                                         asoc->stream_reset_outstanding--;
3627                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3628                                         /* Put the new streams into effect */
3629                                         stcb->asoc.streamoutcnt += num_stream;
3630                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
3631                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3632                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3633                                             SCTP_STREAM_CHANGE_DENIED);
3634                                 } else {
3635                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3636                                             SCTP_STREAM_CHANGE_FAILED);
3637                                 }
3638                         } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) {
3639                                 if (asoc->stream_reset_outstanding)
3640                                         asoc->stream_reset_outstanding--;
3641                                 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3642                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3643                                             SCTP_STREAM_CHANGE_DENIED);
3644                                 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3645                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3646                                             SCTP_STREAM_CHANGE_FAILED);
3647                                 }
3648                         } else if (type == SCTP_STR_RESET_TSN_REQUEST) {
3649                                 /**
3650                                  * a) Adopt the new in tsn.
3651                                  * b) reset the map
3652                                  * c) Adopt the new out-tsn
3653                                  */
3654                                 struct sctp_stream_reset_response_tsn *resp;
3655                                 struct sctp_forward_tsn_chunk fwdtsn;
3656                                 int abort_flag = 0;
3657
3658                                 if (respin == NULL) {
3659                                         /* huh ? */
3660                                         return (0);
3661                                 }
3662                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3663                                         resp = (struct sctp_stream_reset_response_tsn *)respin;
3664                                         asoc->stream_reset_outstanding--;
3665                                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3666                                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3667                                         fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1);
3668                                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3669                                         if (abort_flag) {
3670                                                 return (1);
3671                                         }
3672                                         stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1);
3673                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3674                                                 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3675                                         }
3676                                         stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map;
3677                                         stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn);
3678                                         memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size);
3679
3680                                         stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map;
3681                                         memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size);
3682
3683                                         stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn);
3684                                         stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn;
3685
3686                                         sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL);
3687                                         sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL);
3688                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0);
3689                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3690                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
3691                                             SCTP_ASSOC_RESET_DENIED);
3692                                 } else {
3693                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
3694                                             SCTP_ASSOC_RESET_FAILED);
3695                                 }
3696                         }
3697                         /* get rid of the request and get the request flags */
3698                         if (asoc->stream_reset_outstanding == 0) {
3699                                 sctp_clean_up_stream_reset(stcb);
3700                         }
3701                 }
3702         }
3703         return (0);
3704 }
3705
3706 static void
3707 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb,
3708     struct sctp_tmit_chunk *chk,
3709     struct sctp_stream_reset_in_request *req, int trunc)
3710 {
3711         uint32_t seq;
3712         int len, i;
3713         int number_entries;
3714         uint16_t temp;
3715
3716         /*
3717          * peer wants me to send a str-reset to him for my outgoing seq's if
3718          * seq_in is right.
3719          */
3720         struct sctp_association *asoc = &stcb->asoc;
3721
3722         seq = ntohl(req->request_seq);
3723         if (asoc->str_reset_seq_in == seq) {
3724                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3725                 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
3726                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3727                 } else if (trunc) {
3728                         /* Can't do it, since they exceeded our buffer size  */
3729                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3730                 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) {
3731                         len = ntohs(req->ph.param_length);
3732                         number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t));
3733                         for (i = 0; i < number_entries; i++) {
3734                                 temp = ntohs(req->list_of_streams[i]);
3735                                 req->list_of_streams[i] = temp;
3736                         }
3737                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3738                         sctp_add_stream_reset_out(chk, number_entries, req->list_of_streams,
3739                             asoc->str_reset_seq_out,
3740                             seq, (asoc->sending_seq - 1));
3741                         asoc->stream_reset_out_is_outstanding = 1;
3742                         asoc->str_reset = chk;
3743                         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
3744                         stcb->asoc.stream_reset_outstanding++;
3745                 } else {
3746                         /* Can't do it, since we have sent one out */
3747                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
3748                 }
3749                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3750                 asoc->str_reset_seq_in++;
3751         } else if (asoc->str_reset_seq_in - 1 == seq) {
3752                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3753         } else if (asoc->str_reset_seq_in - 2 == seq) {
3754                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3755         } else {
3756                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3757         }
3758 }
3759
3760 static int
3761 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb,
3762     struct sctp_tmit_chunk *chk,
3763     struct sctp_stream_reset_tsn_request *req)
3764 {
3765         /* reset all in and out and update the tsn */
3766         /*
3767          * A) reset my str-seq's on in and out. B) Select a receive next,
3768          * and set cum-ack to it. Also process this selected number as a
3769          * fwd-tsn as well. C) set in the response my next sending seq.
3770          */
3771         struct sctp_forward_tsn_chunk fwdtsn;
3772         struct sctp_association *asoc = &stcb->asoc;
3773         int abort_flag = 0;
3774         uint32_t seq;
3775
3776         seq = ntohl(req->request_seq);
3777         if (asoc->str_reset_seq_in == seq) {
3778                 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0];
3779                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
3780                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3781                 } else {
3782                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3783                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3784                         fwdtsn.ch.chunk_flags = 0;
3785                         fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1);
3786                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3787                         if (abort_flag) {
3788                                 return (1);
3789                         }
3790                         asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA;
3791                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3792                                 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3793                         }
3794                         asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map;
3795                         asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1;
3796                         memset(asoc->mapping_array, 0, asoc->mapping_array_size);
3797                         asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
3798                         memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size);
3799                         atomic_add_int(&asoc->sending_seq, 1);
3800                         /* save off historical data for retrans */
3801                         asoc->last_sending_seq[1] = asoc->last_sending_seq[0];
3802                         asoc->last_sending_seq[0] = asoc->sending_seq;
3803                         asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0];
3804                         asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn;
3805                         sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL);
3806                         sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL);
3807                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3808                         sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0);
3809                 }
3810                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3811                     asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
3812                 asoc->str_reset_seq_in++;
3813         } else if (asoc->str_reset_seq_in - 1 == seq) {
3814                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3815                     asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
3816         } else if (asoc->str_reset_seq_in - 2 == seq) {
3817                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1],
3818                     asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]);
3819         } else {
3820                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3821         }
3822         return (0);
3823 }
3824
3825 static void
3826 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb,
3827     struct sctp_tmit_chunk *chk,
3828     struct sctp_stream_reset_out_request *req, int trunc)
3829 {
3830         uint32_t seq, tsn;
3831         int number_entries, len;
3832         struct sctp_association *asoc = &stcb->asoc;
3833
3834         seq = ntohl(req->request_seq);
3835
3836         /* now if its not a duplicate we process it */
3837         if (asoc->str_reset_seq_in == seq) {
3838                 len = ntohs(req->ph.param_length);
3839                 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t));
3840                 /*
3841                  * the sender is resetting, handle the list issue.. we must
3842                  * a) verify if we can do the reset, if so no problem b) If
3843                  * we can't do the reset we must copy the request. c) queue
3844                  * it, and setup the data in processor to trigger it off
3845                  * when needed and dequeue all the queued data.
3846                  */
3847                 tsn = ntohl(req->send_reset_at_tsn);
3848
3849                 /* move the reset action back one */
3850                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3851                 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
3852                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3853                 } else if (trunc) {
3854                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3855                 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) {
3856                         /* we can do it now */
3857                         sctp_reset_in_stream(stcb, number_entries, req->list_of_streams);
3858                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3859                 } else {
3860                         /*
3861                          * we must queue it up and thus wait for the TSN's
3862                          * to arrive that are at or before tsn
3863                          */
3864                         struct sctp_stream_reset_list *liste;
3865                         int siz;
3866
3867                         siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t));
3868                         SCTP_MALLOC(liste, struct sctp_stream_reset_list *,
3869                             siz, SCTP_M_STRESET);
3870                         if (liste == NULL) {
3871                                 /* gak out of memory */
3872                                 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3873                                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3874                                 return;
3875                         }
3876                         liste->tsn = tsn;
3877                         liste->number_entries = number_entries;
3878                         memcpy(&liste->req, req,
3879                             (sizeof(struct sctp_stream_reset_out_request) + (number_entries * sizeof(uint16_t))));
3880                         TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp);
3881                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3882                 }
3883                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3884                 asoc->str_reset_seq_in++;
3885         } else if ((asoc->str_reset_seq_in - 1) == seq) {
3886                 /*
3887                  * one seq back, just echo back last action since my
3888                  * response was lost.
3889                  */
3890                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3891         } else if ((asoc->str_reset_seq_in - 2) == seq) {
3892                 /*
3893                  * two seq back, just echo back last action since my
3894                  * response was lost.
3895                  */
3896                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3897         } else {
3898                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3899         }
3900 }
3901
3902 static void
3903 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
3904     struct sctp_stream_reset_add_strm *str_add)
3905 {
3906         /*
3907          * Peer is requesting to add more streams. If its within our
3908          * max-streams we will allow it.
3909          */
3910         uint32_t num_stream, i;
3911         uint32_t seq;
3912         struct sctp_association *asoc = &stcb->asoc;
3913         struct sctp_queued_to_read *ctl, *nctl;
3914
3915         /* Get the number. */
3916         seq = ntohl(str_add->request_seq);
3917         num_stream = ntohs(str_add->number_of_streams);
3918         /* Now what would be the new total? */
3919         if (asoc->str_reset_seq_in == seq) {
3920                 num_stream += stcb->asoc.streamincnt;
3921                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
3922                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
3923                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3924                 } else if ((num_stream > stcb->asoc.max_inbound_streams) ||
3925                     (num_stream > 0xffff)) {
3926                         /* We must reject it they ask for to many */
3927         denied:
3928                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3929                 } else {
3930                         /* Ok, we can do that :-) */
3931                         struct sctp_stream_in *oldstrm;
3932
3933                         /* save off the old */
3934                         oldstrm = stcb->asoc.strmin;
3935                         SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *,
3936                             (num_stream * sizeof(struct sctp_stream_in)),
3937                             SCTP_M_STRMI);
3938                         if (stcb->asoc.strmin == NULL) {
3939                                 stcb->asoc.strmin = oldstrm;
3940                                 goto denied;
3941                         }
3942                         /* copy off the old data */
3943                         for (i = 0; i < stcb->asoc.streamincnt; i++) {
3944                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
3945                                 stcb->asoc.strmin[i].stream_no = i;
3946                                 stcb->asoc.strmin[i].last_sequence_delivered = oldstrm[i].last_sequence_delivered;
3947                                 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started;
3948                                 /* now anything on those queues? */
3949                                 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next, nctl) {
3950                                         TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next);
3951                                         TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next);
3952                                 }
3953                         }
3954                         /* Init the new streams */
3955                         for (i = stcb->asoc.streamincnt; i < num_stream; i++) {
3956                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
3957                                 stcb->asoc.strmin[i].stream_no = i;
3958                                 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff;
3959                                 stcb->asoc.strmin[i].delivery_started = 0;
3960                         }
3961                         SCTP_FREE(oldstrm, SCTP_M_STRMI);
3962                         /* update the size */
3963                         stcb->asoc.streamincnt = num_stream;
3964                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3965                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
3966                 }
3967                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3968                 asoc->str_reset_seq_in++;
3969         } else if ((asoc->str_reset_seq_in - 1) == seq) {
3970                 /*
3971                  * one seq back, just echo back last action since my
3972                  * response was lost.
3973                  */
3974                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3975         } else if ((asoc->str_reset_seq_in - 2) == seq) {
3976                 /*
3977                  * two seq back, just echo back last action since my
3978                  * response was lost.
3979                  */
3980                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3981         } else {
3982                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3983
3984         }
3985 }
3986
3987 static void
3988 sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
3989     struct sctp_stream_reset_add_strm *str_add)
3990 {
3991         /*
3992          * Peer is requesting to add more streams. If its within our
3993          * max-streams we will allow it.
3994          */
3995         uint16_t num_stream;
3996         uint32_t seq;
3997         struct sctp_association *asoc = &stcb->asoc;
3998
3999         /* Get the number. */
4000         seq = ntohl(str_add->request_seq);
4001         num_stream = ntohs(str_add->number_of_streams);
4002         /* Now what would be the new total? */
4003         if (asoc->str_reset_seq_in == seq) {
4004                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
4005                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
4006                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4007                 } else if (stcb->asoc.stream_reset_outstanding) {
4008                         /* We must reject it we have something pending */
4009                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
4010                 } else {
4011                         /* Ok, we can do that :-) */
4012                         int mychk;
4013
4014                         mychk = stcb->asoc.streamoutcnt;
4015                         mychk += num_stream;
4016                         if (mychk < 0x10000) {
4017                                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
4018                                 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 0, 1, num_stream, 0, 1)) {
4019                                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4020                                 }
4021                         } else {
4022                                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4023                         }
4024                 }
4025                 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]);
4026                 asoc->str_reset_seq_in++;
4027         } else if ((asoc->str_reset_seq_in - 1) == seq) {
4028                 /*
4029                  * one seq back, just echo back last action since my
4030                  * response was lost.
4031                  */
4032                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4033         } else if ((asoc->str_reset_seq_in - 2) == seq) {
4034                 /*
4035                  * two seq back, just echo back last action since my
4036                  * response was lost.
4037                  */
4038                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
4039         } else {
4040                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
4041         }
4042 }
4043
4044 #ifdef __GNUC__
4045 __attribute__((noinline))
4046 #endif
4047         static int
4048             sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset,
4049         struct sctp_stream_reset_out_req *sr_req)
4050 {
4051         int chk_length, param_len, ptype;
4052         struct sctp_paramhdr pstore;
4053         uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE];
4054         uint32_t seq = 0;
4055         int num_req = 0;
4056         int trunc = 0;
4057         struct sctp_tmit_chunk *chk;
4058         struct sctp_chunkhdr *ch;
4059         struct sctp_paramhdr *ph;
4060         int ret_code = 0;
4061         int num_param = 0;
4062
4063         /* now it may be a reset or a reset-response */
4064         chk_length = ntohs(sr_req->ch.chunk_length);
4065
4066         /* setup for adding the response */
4067         sctp_alloc_a_chunk(stcb, chk);
4068         if (chk == NULL) {
4069                 return (ret_code);
4070         }
4071         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
4072         chk->rec.chunk_id.can_take_data = 0;
4073         chk->asoc = &stcb->asoc;
4074         chk->no_fr_allowed = 0;
4075         chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr);
4076         chk->book_size_scale = 0;
4077         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
4078         if (chk->data == NULL) {
4079 strres_nochunk:
4080                 if (chk->data) {
4081                         sctp_m_freem(chk->data);
4082                         chk->data = NULL;
4083                 }
4084                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
4085                 return (ret_code);
4086         }
4087         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
4088
4089         /* setup chunk parameters */
4090         chk->sent = SCTP_DATAGRAM_UNSENT;
4091         chk->snd_count = 0;
4092         chk->whoTo = NULL;
4093
4094         ch = mtod(chk->data, struct sctp_chunkhdr *);
4095         ch->chunk_type = SCTP_STREAM_RESET;
4096         ch->chunk_flags = 0;
4097         ch->chunk_length = htons(chk->send_size);
4098         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
4099         offset += sizeof(struct sctp_chunkhdr);
4100         while ((size_t)chk_length >= sizeof(struct sctp_stream_reset_tsn_request)) {
4101                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *) & pstore);
4102                 if (ph == NULL)
4103                         break;
4104                 param_len = ntohs(ph->param_length);
4105                 if (param_len < (int)sizeof(struct sctp_stream_reset_tsn_request)) {
4106                         /* bad param */
4107                         break;
4108                 }
4109                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, (int)sizeof(cstore)),
4110                     (uint8_t *) & cstore);
4111                 ptype = ntohs(ph->param_type);
4112                 num_param++;
4113                 if (param_len > (int)sizeof(cstore)) {
4114                         trunc = 1;
4115                 } else {
4116                         trunc = 0;
4117                 }
4118                 if (num_param > SCTP_MAX_RESET_PARAMS) {
4119                         /* hit the max of parameters already sorry.. */
4120                         break;
4121                 }
4122                 if (ptype == SCTP_STR_RESET_OUT_REQUEST) {
4123                         struct sctp_stream_reset_out_request *req_out;
4124
4125                         req_out = (struct sctp_stream_reset_out_request *)ph;
4126                         num_req++;
4127                         if (stcb->asoc.stream_reset_outstanding) {
4128                                 seq = ntohl(req_out->response_seq);
4129                                 if (seq == stcb->asoc.str_reset_seq_out) {
4130                                         /* implicit ack */
4131                                         (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL);
4132                                 }
4133                         }
4134                         sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc);
4135                 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) {
4136                         struct sctp_stream_reset_add_strm *str_add;
4137
4138                         str_add = (struct sctp_stream_reset_add_strm *)ph;
4139                         num_req++;
4140                         sctp_handle_str_reset_add_strm(stcb, chk, str_add);
4141                 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) {
4142                         struct sctp_stream_reset_add_strm *str_add;
4143
4144                         str_add = (struct sctp_stream_reset_add_strm *)ph;
4145                         num_req++;
4146                         sctp_handle_str_reset_add_out_strm(stcb, chk, str_add);
4147                 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) {
4148                         struct sctp_stream_reset_in_request *req_in;
4149
4150                         num_req++;
4151                         req_in = (struct sctp_stream_reset_in_request *)ph;
4152                         sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc);
4153                 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) {
4154                         struct sctp_stream_reset_tsn_request *req_tsn;
4155
4156                         num_req++;
4157                         req_tsn = (struct sctp_stream_reset_tsn_request *)ph;
4158                         if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) {
4159                                 ret_code = 1;
4160                                 goto strres_nochunk;
4161                         }
4162                         /* no more */
4163                         break;
4164                 } else if (ptype == SCTP_STR_RESET_RESPONSE) {
4165                         struct sctp_stream_reset_response *resp;
4166                         uint32_t result;
4167
4168                         resp = (struct sctp_stream_reset_response *)ph;
4169                         seq = ntohl(resp->response_seq);
4170                         result = ntohl(resp->result);
4171                         if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) {
4172                                 ret_code = 1;
4173                                 goto strres_nochunk;
4174                         }
4175                 } else {
4176                         break;
4177                 }
4178                 offset += SCTP_SIZE32(param_len);
4179                 chk_length -= SCTP_SIZE32(param_len);
4180         }
4181         if (num_req == 0) {
4182                 /* we have no response free the stuff */
4183                 goto strres_nochunk;
4184         }
4185         /* ok we have a chunk to link in */
4186         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue,
4187             chk,
4188             sctp_next);
4189         stcb->asoc.ctrl_queue_cnt++;
4190         return (ret_code);
4191 }
4192
4193 /*
4194  * Handle a router or endpoints report of a packet loss, there are two ways
4195  * to handle this, either we get the whole packet and must disect it
4196  * ourselves (possibly with truncation and or corruption) or it is a summary
4197  * from a middle box that did the disectting for us.
4198  */
4199 static void
4200 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp,
4201     struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit)
4202 {
4203         uint32_t bottle_bw, on_queue;
4204         uint16_t trunc_len;
4205         unsigned int chlen;
4206         unsigned int at;
4207         struct sctp_chunk_desc desc;
4208         struct sctp_chunkhdr *ch;
4209
4210         chlen = ntohs(cp->ch.chunk_length);
4211         chlen -= sizeof(struct sctp_pktdrop_chunk);
4212         /* XXX possible chlen underflow */
4213         if (chlen == 0) {
4214                 ch = NULL;
4215                 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)
4216                         SCTP_STAT_INCR(sctps_pdrpbwrpt);
4217         } else {
4218                 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr));
4219                 chlen -= sizeof(struct sctphdr);
4220                 /* XXX possible chlen underflow */
4221                 memset(&desc, 0, sizeof(desc));
4222         }
4223         trunc_len = (uint16_t) ntohs(cp->trunc_len);
4224         if (trunc_len > limit) {
4225                 trunc_len = limit;
4226         }
4227         /* now the chunks themselves */
4228         while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) {
4229                 desc.chunk_type = ch->chunk_type;
4230                 /* get amount we need to move */
4231                 at = ntohs(ch->chunk_length);
4232                 if (at < sizeof(struct sctp_chunkhdr)) {
4233                         /* corrupt chunk, maybe at the end? */
4234                         SCTP_STAT_INCR(sctps_pdrpcrupt);
4235                         break;
4236                 }
4237                 if (trunc_len == 0) {
4238                         /* we are supposed to have all of it */
4239                         if (at > chlen) {
4240                                 /* corrupt skip it */
4241                                 SCTP_STAT_INCR(sctps_pdrpcrupt);
4242                                 break;
4243                         }
4244                 } else {
4245                         /* is there enough of it left ? */
4246                         if (desc.chunk_type == SCTP_DATA) {
4247                                 if (chlen < (sizeof(struct sctp_data_chunk) +
4248                                     sizeof(desc.data_bytes))) {
4249                                         break;
4250                                 }
4251                         } else {
4252                                 if (chlen < sizeof(struct sctp_chunkhdr)) {
4253                                         break;
4254                                 }
4255                         }
4256                 }
4257                 if (desc.chunk_type == SCTP_DATA) {
4258                         /* can we get out the tsn? */
4259                         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
4260                                 SCTP_STAT_INCR(sctps_pdrpmbda);
4261
4262                         if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) {
4263                                 /* yep */
4264                                 struct sctp_data_chunk *dcp;
4265                                 uint8_t *ddp;
4266                                 unsigned int iii;
4267
4268                                 dcp = (struct sctp_data_chunk *)ch;
4269                                 ddp = (uint8_t *) (dcp + 1);
4270                                 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) {
4271                                         desc.data_bytes[iii] = ddp[iii];
4272                                 }
4273                                 desc.tsn_ifany = dcp->dp.tsn;
4274                         } else {
4275                                 /* nope we are done. */
4276                                 SCTP_STAT_INCR(sctps_pdrpnedat);
4277                                 break;
4278                         }
4279                 } else {
4280                         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
4281                                 SCTP_STAT_INCR(sctps_pdrpmbct);
4282                 }
4283
4284                 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) {
4285                         SCTP_STAT_INCR(sctps_pdrppdbrk);
4286                         break;
4287                 }
4288                 if (SCTP_SIZE32(at) > chlen) {
4289                         break;
4290                 }
4291                 chlen -= SCTP_SIZE32(at);
4292                 if (chlen < sizeof(struct sctp_chunkhdr)) {
4293                         /* done, none left */
4294                         break;
4295                 }
4296                 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at));
4297         }
4298         /* Now update any rwnd --- possibly */
4299         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) {
4300                 /* From a peer, we get a rwnd report */
4301                 uint32_t a_rwnd;
4302
4303                 SCTP_STAT_INCR(sctps_pdrpfehos);
4304
4305                 bottle_bw = ntohl(cp->bottle_bw);
4306                 on_queue = ntohl(cp->current_onq);
4307                 if (bottle_bw && on_queue) {
4308                         /* a rwnd report is in here */
4309                         if (bottle_bw > on_queue)
4310                                 a_rwnd = bottle_bw - on_queue;
4311                         else
4312                                 a_rwnd = 0;
4313
4314                         if (a_rwnd == 0)
4315                                 stcb->asoc.peers_rwnd = 0;
4316                         else {
4317                                 if (a_rwnd > stcb->asoc.total_flight) {
4318                                         stcb->asoc.peers_rwnd =
4319                                             a_rwnd - stcb->asoc.total_flight;
4320                                 } else {
4321                                         stcb->asoc.peers_rwnd = 0;
4322                                 }
4323                                 if (stcb->asoc.peers_rwnd <
4324                                     stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
4325                                         /* SWS sender side engages */
4326                                         stcb->asoc.peers_rwnd = 0;
4327                                 }
4328                         }
4329                 }
4330         } else {
4331                 SCTP_STAT_INCR(sctps_pdrpfmbox);
4332         }
4333
4334         /* now middle boxes in sat networks get a cwnd bump */
4335         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) &&
4336             (stcb->asoc.sat_t3_loss_recovery == 0) &&
4337             (stcb->asoc.sat_network)) {
4338                 /*
4339                  * This is debateable but for sat networks it makes sense
4340                  * Note if a T3 timer has went off, we will prohibit any
4341                  * changes to cwnd until we exit the t3 loss recovery.
4342                  */
4343                 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb,
4344                     net, cp, &bottle_bw, &on_queue);
4345         }
4346 }
4347
4348 /*
4349  * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to
4350  * still contain IP/SCTP header - stcb: is the tcb found for this packet -
4351  * offset: offset into the mbuf chain to first chunkhdr - length: is the
4352  * length of the complete packet outputs: - length: modified to remaining
4353  * length after control processing - netp: modified to new sctp_nets after
4354  * cookie-echo processing - return NULL to discard the packet (ie. no asoc,
4355  * bad packet,...) otherwise return the tcb for this packet
4356  */
4357 #ifdef __GNUC__
4358 __attribute__((noinline))
4359 #endif
4360         static struct sctp_tcb *
4361                  sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length,
4362              struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp,
4363              struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen,
4364              uint32_t vrf_id, uint16_t port)
4365 {
4366         struct sctp_association *asoc;
4367         uint32_t vtag_in;
4368         int num_chunks = 0;     /* number of control chunks processed */
4369         uint32_t chk_length;
4370         int ret;
4371         int abort_no_unlock = 0;
4372         int ecne_seen = 0;
4373
4374         /*
4375          * How big should this be, and should it be alloc'd? Lets try the
4376          * d-mtu-ceiling for now (2k) and that should hopefully work ...
4377          * until we get into jumbo grams and such..
4378          */
4379         uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE];
4380         struct sctp_tcb *locked_tcb = stcb;
4381         int got_auth = 0;
4382         uint32_t auth_offset = 0, auth_len = 0;
4383         int auth_skipped = 0;
4384         int asconf_cnt = 0;
4385
4386 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4387         struct socket *so;
4388
4389 #endif
4390
4391         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n",
4392             iphlen, *offset, length, stcb);
4393
4394         /* validate chunk header length... */
4395         if (ntohs(ch->chunk_length) < sizeof(*ch)) {
4396                 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n",
4397                     ntohs(ch->chunk_length));
4398                 if (locked_tcb) {
4399                         SCTP_TCB_UNLOCK(locked_tcb);
4400                 }
4401                 return (NULL);
4402         }
4403         /*
4404          * validate the verification tag
4405          */
4406         vtag_in = ntohl(sh->v_tag);
4407
4408         if (locked_tcb) {
4409                 SCTP_TCB_LOCK_ASSERT(locked_tcb);
4410         }
4411         if (ch->chunk_type == SCTP_INITIATION) {
4412                 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n",
4413                     ntohs(ch->chunk_length), vtag_in);
4414                 if (vtag_in != 0) {
4415                         /* protocol error- silently discard... */
4416                         SCTP_STAT_INCR(sctps_badvtag);
4417                         if (locked_tcb) {
4418                                 SCTP_TCB_UNLOCK(locked_tcb);
4419                         }
4420                         return (NULL);
4421                 }
4422         } else if (ch->chunk_type != SCTP_COOKIE_ECHO) {
4423                 /*
4424                  * If there is no stcb, skip the AUTH chunk and process
4425                  * later after a stcb is found (to validate the lookup was
4426                  * valid.
4427                  */
4428                 if ((ch->chunk_type == SCTP_AUTHENTICATION) &&
4429                     (stcb == NULL) &&
4430                     !SCTP_BASE_SYSCTL(sctp_auth_disable)) {
4431                         /* save this chunk for later processing */
4432                         auth_skipped = 1;
4433                         auth_offset = *offset;
4434                         auth_len = ntohs(ch->chunk_length);
4435
4436                         /* (temporarily) move past this chunk */
4437                         *offset += SCTP_SIZE32(auth_len);
4438                         if (*offset >= length) {
4439                                 /* no more data left in the mbuf chain */
4440                                 *offset = length;
4441                                 if (locked_tcb) {
4442                                         SCTP_TCB_UNLOCK(locked_tcb);
4443                                 }
4444                                 return (NULL);
4445                         }
4446                         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4447                             sizeof(struct sctp_chunkhdr), chunk_buf);
4448                 }
4449                 if (ch == NULL) {
4450                         /* Help */
4451                         *offset = length;
4452                         if (locked_tcb) {
4453                                 SCTP_TCB_UNLOCK(locked_tcb);
4454                         }
4455                         return (NULL);
4456                 }
4457                 if (ch->chunk_type == SCTP_COOKIE_ECHO) {
4458                         goto process_control_chunks;
4459                 }
4460                 /*
4461                  * first check if it's an ASCONF with an unknown src addr we
4462                  * need to look inside to find the association
4463                  */
4464                 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) {
4465                         struct sctp_chunkhdr *asconf_ch = ch;
4466                         uint32_t asconf_offset = 0, asconf_len = 0;
4467
4468                         /* inp's refcount may be reduced */
4469                         SCTP_INP_INCR_REF(inp);
4470
4471                         asconf_offset = *offset;
4472                         do {
4473                                 asconf_len = ntohs(asconf_ch->chunk_length);
4474                                 if (asconf_len < sizeof(struct sctp_asconf_paramhdr))
4475                                         break;
4476                                 stcb = sctp_findassociation_ep_asconf(m,
4477                                     *offset, sh, &inp, netp, vrf_id);
4478                                 if (stcb != NULL)
4479                                         break;
4480                                 asconf_offset += SCTP_SIZE32(asconf_len);
4481                                 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset,
4482                                     sizeof(struct sctp_chunkhdr), chunk_buf);
4483                         } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF);
4484                         if (stcb == NULL) {
4485                                 /*
4486                                  * reduce inp's refcount if not reduced in
4487                                  * sctp_findassociation_ep_asconf().
4488                                  */
4489                                 SCTP_INP_DECR_REF(inp);
4490                         } else {
4491                                 locked_tcb = stcb;
4492                         }
4493
4494                         /* now go back and verify any auth chunk to be sure */
4495                         if (auth_skipped && (stcb != NULL)) {
4496                                 struct sctp_auth_chunk *auth;
4497
4498                                 auth = (struct sctp_auth_chunk *)
4499                                     sctp_m_getptr(m, auth_offset,
4500                                     auth_len, chunk_buf);
4501                                 got_auth = 1;
4502                                 auth_skipped = 0;
4503                                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m,
4504                                     auth_offset)) {
4505                                         /* auth HMAC failed so dump it */
4506                                         *offset = length;
4507                                         if (locked_tcb) {
4508                                                 SCTP_TCB_UNLOCK(locked_tcb);
4509                                         }
4510                                         return (NULL);
4511                                 } else {
4512                                         /* remaining chunks are HMAC checked */
4513                                         stcb->asoc.authenticated = 1;
4514                                 }
4515                         }
4516                 }
4517                 if (stcb == NULL) {
4518                         /* no association, so it's out of the blue... */
4519                         sctp_handle_ootb(m, iphlen, *offset, sh, inp,
4520                             vrf_id, port);
4521                         *offset = length;
4522                         if (locked_tcb) {
4523                                 SCTP_TCB_UNLOCK(locked_tcb);
4524                         }
4525                         return (NULL);
4526                 }
4527                 asoc = &stcb->asoc;
4528                 /* ABORT and SHUTDOWN can use either v_tag... */
4529                 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) ||
4530                     (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) ||
4531                     (ch->chunk_type == SCTP_PACKET_DROPPED)) {
4532                         if ((vtag_in == asoc->my_vtag) ||
4533                             ((ch->chunk_flags & SCTP_HAD_NO_TCB) &&
4534                             (vtag_in == asoc->peer_vtag))) {
4535                                 /* this is valid */
4536                         } else {
4537                                 /* drop this packet... */
4538                                 SCTP_STAT_INCR(sctps_badvtag);
4539                                 if (locked_tcb) {
4540                                         SCTP_TCB_UNLOCK(locked_tcb);
4541                                 }
4542                                 return (NULL);
4543                         }
4544                 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
4545                         if (vtag_in != asoc->my_vtag) {
4546                                 /*
4547                                  * this could be a stale SHUTDOWN-ACK or the
4548                                  * peer never got the SHUTDOWN-COMPLETE and
4549                                  * is still hung; we have started a new asoc
4550                                  * but it won't complete until the shutdown
4551                                  * is completed
4552                                  */
4553                                 if (locked_tcb) {
4554                                         SCTP_TCB_UNLOCK(locked_tcb);
4555                                 }
4556                                 sctp_handle_ootb(m, iphlen, *offset, sh, inp,
4557                                     vrf_id, port);
4558                                 return (NULL);
4559                         }
4560                 } else {
4561                         /* for all other chunks, vtag must match */
4562                         if (vtag_in != asoc->my_vtag) {
4563                                 /* invalid vtag... */
4564                                 SCTPDBG(SCTP_DEBUG_INPUT3,
4565                                     "invalid vtag: %xh, expect %xh\n",
4566                                     vtag_in, asoc->my_vtag);
4567                                 SCTP_STAT_INCR(sctps_badvtag);
4568                                 if (locked_tcb) {
4569                                         SCTP_TCB_UNLOCK(locked_tcb);
4570                                 }
4571                                 *offset = length;
4572                                 return (NULL);
4573                         }
4574                 }
4575         }                       /* end if !SCTP_COOKIE_ECHO */
4576         /*
4577          * process all control chunks...
4578          */
4579         if (((ch->chunk_type == SCTP_SELECTIVE_ACK) ||
4580             (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) ||
4581             (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) &&
4582             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) {
4583                 /* implied cookie-ack.. we must have lost the ack */
4584                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
4585                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
4586                             stcb->asoc.overall_error_count,
4587                             0,
4588                             SCTP_FROM_SCTP_INPUT,
4589                             __LINE__);
4590                 }
4591                 stcb->asoc.overall_error_count = 0;
4592                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb,
4593                     *netp);
4594         }
4595 process_control_chunks:
4596         while (IS_SCTP_CONTROL(ch)) {
4597                 /* validate chunk length */
4598                 chk_length = ntohs(ch->chunk_length);
4599                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n",
4600                     ch->chunk_type, chk_length);
4601                 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length);
4602                 if (chk_length < sizeof(*ch) ||
4603                     (*offset + (int)chk_length) > length) {
4604                         *offset = length;
4605                         if (locked_tcb) {
4606                                 SCTP_TCB_UNLOCK(locked_tcb);
4607                         }
4608                         return (NULL);
4609                 }
4610                 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks);
4611                 /*
4612                  * INIT-ACK only gets the init ack "header" portion only
4613                  * because we don't have to process the peer's COOKIE. All
4614                  * others get a complete chunk.
4615                  */
4616                 if ((ch->chunk_type == SCTP_INITIATION_ACK) ||
4617                     (ch->chunk_type == SCTP_INITIATION)) {
4618                         /* get an init-ack chunk */
4619                         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4620                             sizeof(struct sctp_init_ack_chunk), chunk_buf);
4621                         if (ch == NULL) {
4622                                 *offset = length;
4623                                 if (locked_tcb) {
4624                                         SCTP_TCB_UNLOCK(locked_tcb);
4625                                 }
4626                                 return (NULL);
4627                         }
4628                 } else {
4629                         /* For cookies and all other chunks. */
4630                         if (chk_length > sizeof(chunk_buf)) {
4631                                 /*
4632                                  * use just the size of the chunk buffer so
4633                                  * the front part of our chunks fit in
4634                                  * contiguous space up to the chunk buffer
4635                                  * size (508 bytes). For chunks that need to
4636                                  * get more than that they must use the
4637                                  * sctp_m_getptr() function or other means
4638                                  * (e.g. know how to parse mbuf chains).
4639                                  * Cookies do this already.
4640                                  */
4641                                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4642                                     (sizeof(chunk_buf) - 4),
4643                                     chunk_buf);
4644                                 if (ch == NULL) {
4645                                         *offset = length;
4646                                         if (locked_tcb) {
4647                                                 SCTP_TCB_UNLOCK(locked_tcb);
4648                                         }
4649                                         return (NULL);
4650                                 }
4651                         } else {
4652                                 /* We can fit it all */
4653                                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4654                                     chk_length, chunk_buf);
4655                                 if (ch == NULL) {
4656                                         SCTP_PRINTF("sctp_process_control: Can't get the all data....\n");
4657                                         *offset = length;
4658                                         if (locked_tcb) {
4659                                                 SCTP_TCB_UNLOCK(locked_tcb);
4660                                         }
4661                                         return (NULL);
4662                                 }
4663                         }
4664                 }
4665                 num_chunks++;
4666                 /* Save off the last place we got a control from */
4667                 if (stcb != NULL) {
4668                         if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) {
4669                                 /*
4670                                  * allow last_control to be NULL if
4671                                  * ASCONF... ASCONF processing will find the
4672                                  * right net later
4673                                  */
4674                                 if ((netp != NULL) && (*netp != NULL))
4675                                         stcb->asoc.last_control_chunk_from = *netp;
4676                         }
4677                 }
4678 #ifdef SCTP_AUDITING_ENABLED
4679                 sctp_audit_log(0xB0, ch->chunk_type);
4680 #endif
4681
4682                 /* check to see if this chunk required auth, but isn't */
4683                 if ((stcb != NULL) &&
4684                     !SCTP_BASE_SYSCTL(sctp_auth_disable) &&
4685                     sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) &&
4686                     !stcb->asoc.authenticated) {
4687                         /* "silently" ignore */
4688                         SCTP_STAT_INCR(sctps_recvauthmissing);
4689                         goto next_chunk;
4690                 }
4691                 switch (ch->chunk_type) {
4692                 case SCTP_INITIATION:
4693                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n");
4694                         /* The INIT chunk must be the only chunk. */
4695                         if ((num_chunks > 1) ||
4696                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4697                                 sctp_abort_association(inp, stcb, m,
4698                                     iphlen, sh, NULL, vrf_id, port);
4699                                 *offset = length;
4700                                 return (NULL);
4701                         }
4702                         /* Honor our resource limit. */
4703                         if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) {
4704                                 struct mbuf *op_err;
4705
4706                                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC);
4707                                 sctp_abort_association(inp, stcb, m,
4708                                     iphlen, sh, op_err, vrf_id, port);
4709                                 *offset = length;
4710                                 return (NULL);
4711                         }
4712                         sctp_handle_init(m, iphlen, *offset, sh,
4713                             (struct sctp_init_chunk *)ch, inp,
4714                             stcb, &abort_no_unlock, vrf_id, port);
4715                         *offset = length;
4716                         if ((!abort_no_unlock) && (locked_tcb)) {
4717                                 SCTP_TCB_UNLOCK(locked_tcb);
4718                         }
4719                         return (NULL);
4720                         break;
4721                 case SCTP_PAD_CHUNK:
4722                         break;
4723                 case SCTP_INITIATION_ACK:
4724                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT-ACK\n");
4725                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4726                                 /* We are not interested anymore */
4727                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
4728                                         ;
4729                                 } else {
4730                                         if (locked_tcb != stcb) {
4731                                                 /* Very unlikely */
4732                                                 SCTP_TCB_UNLOCK(locked_tcb);
4733                                         }
4734                                         *offset = length;
4735                                         if (stcb) {
4736 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4737                                                 so = SCTP_INP_SO(inp);
4738                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4739                                                 SCTP_TCB_UNLOCK(stcb);
4740                                                 SCTP_SOCKET_LOCK(so, 1);
4741                                                 SCTP_TCB_LOCK(stcb);
4742                                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4743 #endif
4744                                                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27);
4745 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4746                                                 SCTP_SOCKET_UNLOCK(so, 1);
4747 #endif
4748                                         }
4749                                         return (NULL);
4750                                 }
4751                         }
4752                         /* The INIT-ACK chunk must be the only chunk. */
4753                         if ((num_chunks > 1) ||
4754                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4755                                 *offset = length;
4756                                 if (locked_tcb) {
4757                                         SCTP_TCB_UNLOCK(locked_tcb);
4758                                 }
4759                                 return (NULL);
4760                         }
4761                         if ((netp) && (*netp)) {
4762                                 ret = sctp_handle_init_ack(m, iphlen, *offset, sh,
4763                                     (struct sctp_init_ack_chunk *)ch, stcb, *netp, &abort_no_unlock, vrf_id);
4764                         } else {
4765                                 ret = -1;
4766                         }
4767                         *offset = length;
4768                         if (abort_no_unlock) {
4769                                 return (NULL);
4770                         }
4771                         /*
4772                          * Special case, I must call the output routine to
4773                          * get the cookie echoed
4774                          */
4775                         if ((stcb != NULL) && (ret == 0)) {
4776                                 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
4777                         }
4778                         if (locked_tcb) {
4779                                 SCTP_TCB_UNLOCK(locked_tcb);
4780                         }
4781                         return (NULL);
4782                         break;
4783                 case SCTP_SELECTIVE_ACK:
4784                         {
4785                                 struct sctp_sack_chunk *sack;
4786                                 int abort_now = 0;
4787                                 uint32_t a_rwnd, cum_ack;
4788                                 uint16_t num_seg, num_dup;
4789                                 uint8_t flags;
4790                                 int offset_seg, offset_dup;
4791
4792                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK\n");
4793                                 SCTP_STAT_INCR(sctps_recvsacks);
4794                                 if (stcb == NULL) {
4795                                         SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing SACK chunk\n");
4796                                         break;
4797                                 }
4798                                 if (chk_length < sizeof(struct sctp_sack_chunk)) {
4799                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n");
4800                                         break;
4801                                 }
4802                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
4803                                         /*-
4804                                          * If we have sent a shutdown-ack, we will pay no
4805                                          * attention to a sack sent in to us since
4806                                          * we don't care anymore.
4807                                          */
4808                                         break;
4809                                 }
4810                                 sack = (struct sctp_sack_chunk *)ch;
4811                                 flags = ch->chunk_flags;
4812                                 cum_ack = ntohl(sack->sack.cum_tsn_ack);
4813                                 num_seg = ntohs(sack->sack.num_gap_ack_blks);
4814                                 num_dup = ntohs(sack->sack.num_dup_tsns);
4815                                 a_rwnd = (uint32_t) ntohl(sack->sack.a_rwnd);
4816                                 if (sizeof(struct sctp_sack_chunk) +
4817                                     num_seg * sizeof(struct sctp_gap_ack_block) +
4818                                     num_dup * sizeof(uint32_t) != chk_length) {
4819                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n");
4820                                         break;
4821                                 }
4822                                 offset_seg = *offset + sizeof(struct sctp_sack_chunk);
4823                                 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
4824                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n",
4825                                     cum_ack, num_seg, a_rwnd);
4826                                 stcb->asoc.seen_a_sack_this_pkt = 1;
4827                                 if ((stcb->asoc.pr_sctp_cnt == 0) &&
4828                                     (num_seg == 0) &&
4829                                     SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
4830                                     (stcb->asoc.saw_sack_with_frags == 0) &&
4831                                     (stcb->asoc.saw_sack_with_nr_frags == 0) &&
4832                                     (!TAILQ_EMPTY(&stcb->asoc.sent_queue))
4833                                     ) {
4834                                         /*
4835                                          * We have a SIMPLE sack having no
4836                                          * prior segments and data on sent
4837                                          * queue to be acked.. Use the
4838                                          * faster path sack processing. We
4839                                          * also allow window update sacks
4840                                          * with no missing segments to go
4841                                          * this way too.
4842                                          */
4843                                         sctp_express_handle_sack(stcb, cum_ack, a_rwnd, &abort_now, ecne_seen);
4844                                 } else {
4845                                         if (netp && *netp)
4846                                                 sctp_handle_sack(m, offset_seg, offset_dup, stcb,
4847                                                     num_seg, 0, num_dup, &abort_now, flags,
4848                                                     cum_ack, a_rwnd, ecne_seen);
4849                                 }
4850                                 if (abort_now) {
4851                                         /* ABORT signal from sack processing */
4852                                         *offset = length;
4853                                         return (NULL);
4854                                 }
4855                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
4856                                     TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
4857                                     (stcb->asoc.stream_queue_cnt == 0)) {
4858                                         sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
4859                                 }
4860                         }
4861                         break;
4862                         /*
4863                          * EY - nr_sack:  If the received chunk is an
4864                          * nr_sack chunk
4865                          */
4866                 case SCTP_NR_SELECTIVE_ACK:
4867                         {
4868                                 struct sctp_nr_sack_chunk *nr_sack;
4869                                 int abort_now = 0;
4870                                 uint32_t a_rwnd, cum_ack;
4871                                 uint16_t num_seg, num_nr_seg, num_dup;
4872                                 uint8_t flags;
4873                                 int offset_seg, offset_dup;
4874
4875                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK\n");
4876                                 SCTP_STAT_INCR(sctps_recvsacks);
4877                                 if (stcb == NULL) {
4878                                         SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing NR-SACK chunk\n");
4879                                         break;
4880                                 }
4881                                 if ((stcb->asoc.sctp_nr_sack_on_off == 0) ||
4882                                     (stcb->asoc.peer_supports_nr_sack == 0)) {
4883                                         goto unknown_chunk;
4884                                 }
4885                                 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) {
4886                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR-SACK chunk, too small\n");
4887                                         break;
4888                                 }
4889                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
4890                                         /*-
4891                                          * If we have sent a shutdown-ack, we will pay no
4892                                          * attention to a sack sent in to us since
4893                                          * we don't care anymore.
4894                                          */
4895                                         break;
4896                                 }
4897                                 nr_sack = (struct sctp_nr_sack_chunk *)ch;
4898                                 flags = ch->chunk_flags;
4899                                 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack);
4900                                 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks);
4901                                 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks);
4902                                 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns);
4903                                 a_rwnd = (uint32_t) ntohl(nr_sack->nr_sack.a_rwnd);
4904                                 if (sizeof(struct sctp_nr_sack_chunk) +
4905                                     (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) +
4906                                     num_dup * sizeof(uint32_t) != chk_length) {
4907                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n");
4908                                         break;
4909                                 }
4910                                 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk);
4911                                 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
4912                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n",
4913                                     cum_ack, num_seg, a_rwnd);
4914                                 stcb->asoc.seen_a_sack_this_pkt = 1;
4915                                 if ((stcb->asoc.pr_sctp_cnt == 0) &&
4916                                     (num_seg == 0) && (num_nr_seg == 0) &&
4917                                     SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
4918                                     (stcb->asoc.saw_sack_with_frags == 0) &&
4919                                     (stcb->asoc.saw_sack_with_nr_frags == 0) &&
4920                                     (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
4921                                         /*
4922                                          * We have a SIMPLE sack having no
4923                                          * prior segments and data on sent
4924                                          * queue to be acked. Use the faster
4925                                          * path sack processing. We also
4926                                          * allow window update sacks with no
4927                                          * missing segments to go this way
4928                                          * too.
4929                                          */
4930                                         sctp_express_handle_sack(stcb, cum_ack, a_rwnd,
4931                                             &abort_now, ecne_seen);
4932                                 } else {
4933                                         if (netp && *netp)
4934                                                 sctp_handle_sack(m, offset_seg, offset_dup, stcb,
4935                                                     num_seg, num_nr_seg, num_dup, &abort_now, flags,
4936                                                     cum_ack, a_rwnd, ecne_seen);
4937                                 }
4938                                 if (abort_now) {
4939                                         /* ABORT signal from sack processing */
4940                                         *offset = length;
4941                                         return (NULL);
4942                                 }
4943                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
4944                                     TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
4945                                     (stcb->asoc.stream_queue_cnt == 0)) {
4946                                         sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
4947                                 }
4948                         }
4949                         break;
4950
4951                 case SCTP_HEARTBEAT_REQUEST:
4952                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n");
4953                         if ((stcb) && netp && *netp) {
4954                                 SCTP_STAT_INCR(sctps_recvheartbeat);
4955                                 sctp_send_heartbeat_ack(stcb, m, *offset,
4956                                     chk_length, *netp);
4957
4958                                 /* He's alive so give him credit */
4959                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
4960                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
4961                                             stcb->asoc.overall_error_count,
4962                                             0,
4963                                             SCTP_FROM_SCTP_INPUT,
4964                                             __LINE__);
4965                                 }
4966                                 stcb->asoc.overall_error_count = 0;
4967                         }
4968                         break;
4969                 case SCTP_HEARTBEAT_ACK:
4970                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT-ACK\n");
4971                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) {
4972                                 /* Its not ours */
4973                                 *offset = length;
4974                                 if (locked_tcb) {
4975                                         SCTP_TCB_UNLOCK(locked_tcb);
4976                                 }
4977                                 return (NULL);
4978                         }
4979                         /* He's alive so give him credit */
4980                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
4981                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
4982                                     stcb->asoc.overall_error_count,
4983                                     0,
4984                                     SCTP_FROM_SCTP_INPUT,
4985                                     __LINE__);
4986                         }
4987                         stcb->asoc.overall_error_count = 0;
4988                         SCTP_STAT_INCR(sctps_recvheartbeatack);
4989                         if (netp && *netp)
4990                                 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch,
4991                                     stcb, *netp);
4992                         break;
4993                 case SCTP_ABORT_ASSOCIATION:
4994                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n",
4995                             stcb);
4996                         if ((stcb) && netp && *netp)
4997                                 sctp_handle_abort((struct sctp_abort_chunk *)ch,
4998                                     stcb, *netp);
4999                         *offset = length;
5000                         return (NULL);
5001                         break;
5002                 case SCTP_SHUTDOWN:
5003                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n",
5004                             stcb);
5005                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) {
5006                                 *offset = length;
5007                                 if (locked_tcb) {
5008                                         SCTP_TCB_UNLOCK(locked_tcb);
5009                                 }
5010                                 return (NULL);
5011                         }
5012                         if (netp && *netp) {
5013                                 int abort_flag = 0;
5014
5015                                 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch,
5016                                     stcb, *netp, &abort_flag);
5017                                 if (abort_flag) {
5018                                         *offset = length;
5019                                         return (NULL);
5020                                 }
5021                         }
5022                         break;
5023                 case SCTP_SHUTDOWN_ACK:
5024                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-ACK, stcb %p\n", stcb);
5025                         if ((stcb) && (netp) && (*netp))
5026                                 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp);
5027                         *offset = length;
5028                         return (NULL);
5029                         break;
5030
5031                 case SCTP_OPERATION_ERROR:
5032                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP-ERR\n");
5033                         if ((stcb) && netp && *netp && sctp_handle_error(ch, stcb, *netp) < 0) {
5034                                 *offset = length;
5035                                 return (NULL);
5036                         }
5037                         break;
5038                 case SCTP_COOKIE_ECHO:
5039                         SCTPDBG(SCTP_DEBUG_INPUT3,
5040                             "SCTP_COOKIE-ECHO, stcb %p\n", stcb);
5041                         if ((stcb) && (stcb->asoc.total_output_queue_size)) {
5042                                 ;
5043                         } else {
5044                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5045                                         /* We are not interested anymore */
5046                         abend:
5047                                         if (stcb) {
5048                                                 SCTP_TCB_UNLOCK(stcb);
5049                                         }
5050                                         *offset = length;
5051                                         return (NULL);
5052                                 }
5053                         }
5054                         /*
5055                          * First are we accepting? We do this again here
5056                          * since it is possible that a previous endpoint WAS
5057                          * listening responded to a INIT-ACK and then
5058                          * closed. We opened and bound.. and are now no
5059                          * longer listening.
5060                          */
5061
5062                         if ((stcb == NULL) && (inp->sctp_socket->so_qlen >= inp->sctp_socket->so_qlimit)) {
5063                                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
5064                                     (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) {
5065                                         struct mbuf *op_err;
5066
5067                                         op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC);
5068                                         sctp_abort_association(inp, stcb, m,
5069                                             iphlen, sh, op_err, vrf_id, port);
5070                                 }
5071                                 *offset = length;
5072                                 return (NULL);
5073                         } else {
5074                                 struct mbuf *ret_buf;
5075                                 struct sctp_inpcb *linp;
5076
5077                                 if (stcb) {
5078                                         linp = NULL;
5079                                 } else {
5080                                         linp = inp;
5081                                 }
5082
5083                                 if (linp) {
5084                                         SCTP_ASOC_CREATE_LOCK(linp);
5085                                         if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
5086                                             (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
5087                                                 SCTP_ASOC_CREATE_UNLOCK(linp);
5088                                                 goto abend;
5089                                         }
5090                                 }
5091                                 if (netp) {
5092                                         ret_buf =
5093                                             sctp_handle_cookie_echo(m, iphlen,
5094                                             *offset, sh,
5095                                             (struct sctp_cookie_echo_chunk *)ch,
5096                                             &inp, &stcb, netp,
5097                                             auth_skipped,
5098                                             auth_offset,
5099                                             auth_len,
5100                                             &locked_tcb,
5101                                             vrf_id,
5102                                             port);
5103                                 } else {
5104                                         ret_buf = NULL;
5105                                 }
5106                                 if (linp) {
5107                                         SCTP_ASOC_CREATE_UNLOCK(linp);
5108                                 }
5109                                 if (ret_buf == NULL) {
5110                                         if (locked_tcb) {
5111                                                 SCTP_TCB_UNLOCK(locked_tcb);
5112                                         }
5113                                         SCTPDBG(SCTP_DEBUG_INPUT3,
5114                                             "GAK, null buffer\n");
5115                                         *offset = length;
5116                                         return (NULL);
5117                                 }
5118                                 /* if AUTH skipped, see if it verified... */
5119                                 if (auth_skipped) {
5120                                         got_auth = 1;
5121                                         auth_skipped = 0;
5122                                 }
5123                                 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) {
5124                                         /*
5125                                          * Restart the timer if we have
5126                                          * pending data
5127                                          */
5128                                         struct sctp_tmit_chunk *chk;
5129
5130                                         chk = TAILQ_FIRST(&stcb->asoc.sent_queue);
5131                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
5132                                 }
5133                         }
5134                         break;
5135                 case SCTP_COOKIE_ACK:
5136                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE-ACK, stcb %p\n", stcb);
5137                         if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) {
5138                                 if (locked_tcb) {
5139                                         SCTP_TCB_UNLOCK(locked_tcb);
5140                                 }
5141                                 return (NULL);
5142                         }
5143                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5144                                 /* We are not interested anymore */
5145                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
5146                                         ;
5147                                 } else if (stcb) {
5148 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5149                                         so = SCTP_INP_SO(inp);
5150                                         atomic_add_int(&stcb->asoc.refcnt, 1);
5151                                         SCTP_TCB_UNLOCK(stcb);
5152                                         SCTP_SOCKET_LOCK(so, 1);
5153                                         SCTP_TCB_LOCK(stcb);
5154                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
5155 #endif
5156                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27);
5157 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5158                                         SCTP_SOCKET_UNLOCK(so, 1);
5159 #endif
5160                                         *offset = length;
5161                                         return (NULL);
5162                                 }
5163                         }
5164                         /* He's alive so give him credit */
5165                         if ((stcb) && netp && *netp) {
5166                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5167                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5168                                             stcb->asoc.overall_error_count,
5169                                             0,
5170                                             SCTP_FROM_SCTP_INPUT,
5171                                             __LINE__);
5172                                 }
5173                                 stcb->asoc.overall_error_count = 0;
5174                                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp);
5175                         }
5176                         break;
5177                 case SCTP_ECN_ECHO:
5178                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-ECHO\n");
5179                         /* He's alive so give him credit */
5180                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) {
5181                                 /* Its not ours */
5182                                 if (locked_tcb) {
5183                                         SCTP_TCB_UNLOCK(locked_tcb);
5184                                 }
5185                                 *offset = length;
5186                                 return (NULL);
5187                         }
5188                         if (stcb) {
5189                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5190                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5191                                             stcb->asoc.overall_error_count,
5192                                             0,
5193                                             SCTP_FROM_SCTP_INPUT,
5194                                             __LINE__);
5195                                 }
5196                                 stcb->asoc.overall_error_count = 0;
5197                                 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch,
5198                                     stcb);
5199                                 ecne_seen = 1;
5200                         }
5201                         break;
5202                 case SCTP_ECN_CWR:
5203                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-CWR\n");
5204                         /* He's alive so give him credit */
5205                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) {
5206                                 /* Its not ours */
5207                                 if (locked_tcb) {
5208                                         SCTP_TCB_UNLOCK(locked_tcb);
5209                                 }
5210                                 *offset = length;
5211                                 return (NULL);
5212                         }
5213                         if (stcb) {
5214                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5215                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5216                                             stcb->asoc.overall_error_count,
5217                                             0,
5218                                             SCTP_FROM_SCTP_INPUT,
5219                                             __LINE__);
5220                                 }
5221                                 stcb->asoc.overall_error_count = 0;
5222                                 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp);
5223                         }
5224                         break;
5225                 case SCTP_SHUTDOWN_COMPLETE:
5226                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-COMPLETE, stcb %p\n", stcb);
5227                         /* must be first and only chunk */
5228                         if ((num_chunks > 1) ||
5229                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
5230                                 *offset = length;
5231                                 if (locked_tcb) {
5232                                         SCTP_TCB_UNLOCK(locked_tcb);
5233                                 }
5234                                 return (NULL);
5235                         }
5236                         if ((stcb) && netp && *netp) {
5237                                 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch,
5238                                     stcb, *netp);
5239                         }
5240                         *offset = length;
5241                         return (NULL);
5242                         break;
5243                 case SCTP_ASCONF:
5244                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n");
5245                         /* He's alive so give him credit */
5246                         if (stcb) {
5247                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5248                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5249                                             stcb->asoc.overall_error_count,
5250                                             0,
5251                                             SCTP_FROM_SCTP_INPUT,
5252                                             __LINE__);
5253                                 }
5254                                 stcb->asoc.overall_error_count = 0;
5255                                 sctp_handle_asconf(m, *offset,
5256                                     (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0);
5257                                 asconf_cnt++;
5258                         }
5259                         break;
5260                 case SCTP_ASCONF_ACK:
5261                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF-ACK\n");
5262                         if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) {
5263                                 /* Its not ours */
5264                                 if (locked_tcb) {
5265                                         SCTP_TCB_UNLOCK(locked_tcb);
5266                                 }
5267                                 *offset = length;
5268                                 return (NULL);
5269                         }
5270                         if ((stcb) && netp && *netp) {
5271                                 /* He's alive so give him credit */
5272                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5273                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5274                                             stcb->asoc.overall_error_count,
5275                                             0,
5276                                             SCTP_FROM_SCTP_INPUT,
5277                                             __LINE__);
5278                                 }
5279                                 stcb->asoc.overall_error_count = 0;
5280                                 sctp_handle_asconf_ack(m, *offset,
5281                                     (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock);
5282                                 if (abort_no_unlock)
5283                                         return (NULL);
5284                         }
5285                         break;
5286                 case SCTP_FORWARD_CUM_TSN:
5287                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD-TSN\n");
5288                         if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) {
5289                                 /* Its not ours */
5290                                 if (locked_tcb) {
5291                                         SCTP_TCB_UNLOCK(locked_tcb);
5292                                 }
5293                                 *offset = length;
5294                                 return (NULL);
5295                         }
5296                         /* He's alive so give him credit */
5297                         if (stcb) {
5298                                 int abort_flag = 0;
5299
5300                                 stcb->asoc.overall_error_count = 0;
5301                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5302                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5303                                             stcb->asoc.overall_error_count,
5304                                             0,
5305                                             SCTP_FROM_SCTP_INPUT,
5306                                             __LINE__);
5307                                 }
5308                                 *fwd_tsn_seen = 1;
5309                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5310                                         /* We are not interested anymore */
5311 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5312                                         so = SCTP_INP_SO(inp);
5313                                         atomic_add_int(&stcb->asoc.refcnt, 1);
5314                                         SCTP_TCB_UNLOCK(stcb);
5315                                         SCTP_SOCKET_LOCK(so, 1);
5316                                         SCTP_TCB_LOCK(stcb);
5317                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
5318 #endif
5319                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_29);
5320 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5321                                         SCTP_SOCKET_UNLOCK(so, 1);
5322 #endif
5323                                         *offset = length;
5324                                         return (NULL);
5325                                 }
5326                                 sctp_handle_forward_tsn(stcb,
5327                                     (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset);
5328                                 if (abort_flag) {
5329                                         *offset = length;
5330                                         return (NULL);
5331                                 } else {
5332                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5333                                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5334                                                     stcb->asoc.overall_error_count,
5335                                                     0,
5336                                                     SCTP_FROM_SCTP_INPUT,
5337                                                     __LINE__);
5338                                         }
5339                                         stcb->asoc.overall_error_count = 0;
5340                                 }
5341
5342                         }
5343                         break;
5344                 case SCTP_STREAM_RESET:
5345                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n");
5346                         if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) {
5347                                 /* Its not ours */
5348                                 if (locked_tcb) {
5349                                         SCTP_TCB_UNLOCK(locked_tcb);
5350                                 }
5351                                 *offset = length;
5352                                 return (NULL);
5353                         }
5354                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5355                                 /* We are not interested anymore */
5356 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5357                                 so = SCTP_INP_SO(inp);
5358                                 atomic_add_int(&stcb->asoc.refcnt, 1);
5359                                 SCTP_TCB_UNLOCK(stcb);
5360                                 SCTP_SOCKET_LOCK(so, 1);
5361                                 SCTP_TCB_LOCK(stcb);
5362                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
5363 #endif
5364                                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_30);
5365 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5366                                 SCTP_SOCKET_UNLOCK(so, 1);
5367 #endif
5368                                 *offset = length;
5369                                 return (NULL);
5370                         }
5371                         if (stcb->asoc.peer_supports_strreset == 0) {
5372                                 /*
5373                                  * hmm, peer should have announced this, but
5374                                  * we will turn it on since he is sending us
5375                                  * a stream reset.
5376                                  */
5377                                 stcb->asoc.peer_supports_strreset = 1;
5378                         }
5379                         if (sctp_handle_stream_reset(stcb, m, *offset, (struct sctp_stream_reset_out_req *)ch)) {
5380                                 /* stop processing */
5381                                 *offset = length;
5382                                 return (NULL);
5383                         }
5384                         break;
5385                 case SCTP_PACKET_DROPPED:
5386                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n");
5387                         /* re-get it all please */
5388                         if (chk_length < sizeof(struct sctp_pktdrop_chunk)) {
5389                                 /* Its not ours */
5390                                 if (locked_tcb) {
5391                                         SCTP_TCB_UNLOCK(locked_tcb);
5392                                 }
5393                                 *offset = length;
5394                                 return (NULL);
5395                         }
5396                         if (ch && (stcb) && netp && (*netp)) {
5397                                 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch,
5398                                     stcb, *netp,
5399                                     min(chk_length, (sizeof(chunk_buf) - 4)));
5400
5401                         }
5402                         break;
5403
5404                 case SCTP_AUTHENTICATION:
5405                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n");
5406                         if (SCTP_BASE_SYSCTL(sctp_auth_disable))
5407                                 goto unknown_chunk;
5408
5409                         if (stcb == NULL) {
5410                                 /* save the first AUTH for later processing */
5411                                 if (auth_skipped == 0) {
5412                                         auth_offset = *offset;
5413                                         auth_len = chk_length;
5414                                         auth_skipped = 1;
5415                                 }
5416                                 /* skip this chunk (temporarily) */
5417                                 goto next_chunk;
5418                         }
5419                         if ((chk_length < (sizeof(struct sctp_auth_chunk))) ||
5420                             (chk_length > (sizeof(struct sctp_auth_chunk) +
5421                             SCTP_AUTH_DIGEST_LEN_MAX))) {
5422                                 /* Its not ours */
5423                                 if (locked_tcb) {
5424                                         SCTP_TCB_UNLOCK(locked_tcb);
5425                                 }
5426                                 *offset = length;
5427                                 return (NULL);
5428                         }
5429                         if (got_auth == 1) {
5430                                 /* skip this chunk... it's already auth'd */
5431                                 goto next_chunk;
5432                         }
5433                         got_auth = 1;
5434                         if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch,
5435                             m, *offset)) {
5436                                 /* auth HMAC failed so dump the packet */
5437                                 *offset = length;
5438                                 return (stcb);
5439                         } else {
5440                                 /* remaining chunks are HMAC checked */
5441                                 stcb->asoc.authenticated = 1;
5442                         }
5443                         break;
5444
5445                 default:
5446         unknown_chunk:
5447                         /* it's an unknown chunk! */
5448                         if ((ch->chunk_type & 0x40) && (stcb != NULL)) {
5449                                 struct mbuf *mm;
5450                                 struct sctp_paramhdr *phd;
5451
5452                                 mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
5453                                     0, M_DONTWAIT, 1, MT_DATA);
5454                                 if (mm) {
5455                                         phd = mtod(mm, struct sctp_paramhdr *);
5456                                         /*
5457                                          * We cheat and use param type since
5458                                          * we did not bother to define a
5459                                          * error cause struct. They are the
5460                                          * same basic format with different
5461                                          * names.
5462                                          */
5463                                         phd->param_type = htons(SCTP_CAUSE_UNRECOG_CHUNK);
5464                                         phd->param_length = htons(chk_length + sizeof(*phd));
5465                                         SCTP_BUF_LEN(mm) = sizeof(*phd);
5466                                         SCTP_BUF_NEXT(mm) = SCTP_M_COPYM(m, *offset, chk_length, M_DONTWAIT);
5467                                         if (SCTP_BUF_NEXT(mm)) {
5468                                                 if (sctp_pad_lastmbuf(SCTP_BUF_NEXT(mm), SCTP_SIZE32(chk_length) - chk_length, NULL)) {
5469                                                         sctp_m_freem(mm);
5470                                                 } else {
5471 #ifdef SCTP_MBUF_LOGGING
5472                                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5473                                                                 struct mbuf *mat;
5474
5475                                                                 for (mat = SCTP_BUF_NEXT(mm); mat; mat = SCTP_BUF_NEXT(mat)) {
5476                                                                         if (SCTP_BUF_IS_EXTENDED(mat)) {
5477                                                                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
5478                                                                         }
5479                                                                 }
5480                                                         }
5481 #endif
5482                                                         sctp_queue_op_err(stcb, mm);
5483                                                 }
5484                                         } else {
5485                                                 sctp_m_freem(mm);
5486                                         }
5487                                 }
5488                         }
5489                         if ((ch->chunk_type & 0x80) == 0) {
5490                                 /* discard this packet */
5491                                 *offset = length;
5492                                 return (stcb);
5493                         }       /* else skip this bad chunk and continue... */
5494                         break;
5495                 }               /* switch (ch->chunk_type) */
5496
5497
5498 next_chunk:
5499                 /* get the next chunk */
5500                 *offset += SCTP_SIZE32(chk_length);
5501                 if (*offset >= length) {
5502                         /* no more data left in the mbuf chain */
5503                         break;
5504                 }
5505                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
5506                     sizeof(struct sctp_chunkhdr), chunk_buf);
5507                 if (ch == NULL) {
5508                         if (locked_tcb) {
5509                                 SCTP_TCB_UNLOCK(locked_tcb);
5510                         }
5511                         *offset = length;
5512                         return (NULL);
5513                 }
5514         }                       /* while */
5515
5516         if (asconf_cnt > 0 && stcb != NULL) {
5517                 sctp_send_asconf_ack(stcb);
5518         }
5519         return (stcb);
5520 }
5521
5522
5523 #ifdef INVARIANTS
5524 #ifdef __GNUC__
5525 __attribute__((noinline))
5526 #endif
5527         void
5528              sctp_validate_no_locks(struct sctp_inpcb *inp)
5529 {
5530         struct sctp_tcb *lstcb;
5531
5532         LIST_FOREACH(lstcb, &inp->sctp_asoc_list, sctp_tcblist) {
5533                 if (mtx_owned(&lstcb->tcb_mtx)) {
5534                         panic("Own lock on stcb at return from input");
5535                 }
5536         }
5537         if (mtx_owned(&inp->inp_create_mtx)) {
5538                 panic("Own create lock on inp");
5539         }
5540         if (mtx_owned(&inp->inp_mtx)) {
5541                 panic("Own inp lock on inp");
5542         }
5543 }
5544
5545 #endif
5546
5547 /*
5548  * common input chunk processing (v4 and v6)
5549  */
5550 void
5551 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset,
5552     int length, struct sctphdr *sh, struct sctp_chunkhdr *ch,
5553     struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets *net,
5554     uint8_t ecn_bits, uint32_t vrf_id, uint16_t port)
5555 {
5556         /*
5557          * Control chunk processing
5558          */
5559         uint32_t high_tsn;
5560         int fwd_tsn_seen = 0, data_processed = 0;
5561         struct mbuf *m = *mm;
5562         int un_sent;
5563         int cnt_ctrl_ready = 0;
5564
5565         SCTP_STAT_INCR(sctps_recvdatagrams);
5566 #ifdef SCTP_AUDITING_ENABLED
5567         sctp_audit_log(0xE0, 1);
5568         sctp_auditing(0, inp, stcb, net);
5569 #endif
5570
5571         SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n",
5572             m, iphlen, offset, length, stcb);
5573         if (stcb) {
5574                 /* always clear this before beginning a packet */
5575                 stcb->asoc.authenticated = 0;
5576                 stcb->asoc.seen_a_sack_this_pkt = 0;
5577                 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n",
5578                     stcb, stcb->asoc.state);
5579
5580                 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) ||
5581                     (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) {
5582                         /*-
5583                          * If we hit here, we had a ref count
5584                          * up when the assoc was aborted and the
5585                          * timer is clearing out the assoc, we should
5586                          * NOT respond to any packet.. its OOTB.
5587                          */
5588                         SCTP_TCB_UNLOCK(stcb);
5589                         sctp_handle_ootb(m, iphlen, offset, sh, inp,
5590                             vrf_id, port);
5591                         goto out_now;
5592                 }
5593         }
5594         if (IS_SCTP_CONTROL(ch)) {
5595                 /* process the control portion of the SCTP packet */
5596                 /* sa_ignore NO_NULL_CHK */
5597                 stcb = sctp_process_control(m, iphlen, &offset, length, sh, ch,
5598                     inp, stcb, &net, &fwd_tsn_seen, vrf_id, port);
5599                 if (stcb) {
5600                         /*
5601                          * This covers us if the cookie-echo was there and
5602                          * it changes our INP.
5603                          */
5604                         inp = stcb->sctp_ep;
5605                         if ((net) && (port)) {
5606                                 if (net->port == 0) {
5607                                         sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr));
5608                                 }
5609                                 net->port = port;
5610                         }
5611                 }
5612         } else {
5613                 /*
5614                  * no control chunks, so pre-process DATA chunks (these
5615                  * checks are taken care of by control processing)
5616                  */
5617
5618                 /*
5619                  * if DATA only packet, and auth is required, then punt...
5620                  * can't have authenticated without any AUTH (control)
5621                  * chunks
5622                  */
5623                 if ((stcb != NULL) &&
5624                     !SCTP_BASE_SYSCTL(sctp_auth_disable) &&
5625                     sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) {
5626                         /* "silently" ignore */
5627                         SCTP_STAT_INCR(sctps_recvauthmissing);
5628                         SCTP_TCB_UNLOCK(stcb);
5629                         goto out_now;
5630                 }
5631                 if (stcb == NULL) {
5632                         /* out of the blue DATA chunk */
5633                         sctp_handle_ootb(m, iphlen, offset, sh, inp,
5634                             vrf_id, port);
5635                         goto out_now;
5636                 }
5637                 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) {
5638                         /* v_tag mismatch! */
5639                         SCTP_STAT_INCR(sctps_badvtag);
5640                         SCTP_TCB_UNLOCK(stcb);
5641                         goto out_now;
5642                 }
5643         }
5644
5645         if (stcb == NULL) {
5646                 /*
5647                  * no valid TCB for this packet, or we found it's a bad
5648                  * packet while processing control, or we're done with this
5649                  * packet (done or skip rest of data), so we drop it...
5650                  */
5651                 goto out_now;
5652         }
5653         /*
5654          * DATA chunk processing
5655          */
5656         /* plow through the data chunks while length > offset */
5657
5658         /*
5659          * Rest should be DATA only.  Check authentication state if AUTH for
5660          * DATA is required.
5661          */
5662         if ((length > offset) &&
5663             (stcb != NULL) &&
5664             !SCTP_BASE_SYSCTL(sctp_auth_disable) &&
5665             sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) &&
5666             !stcb->asoc.authenticated) {
5667                 /* "silently" ignore */
5668                 SCTP_STAT_INCR(sctps_recvauthmissing);
5669                 SCTPDBG(SCTP_DEBUG_AUTH1,
5670                     "Data chunk requires AUTH, skipped\n");
5671                 goto trigger_send;
5672         }
5673         if (length > offset) {
5674                 int retval;
5675
5676                 /*
5677                  * First check to make sure our state is correct. We would
5678                  * not get here unless we really did have a tag, so we don't
5679                  * abort if this happens, just dump the chunk silently.
5680                  */
5681                 switch (SCTP_GET_STATE(&stcb->asoc)) {
5682                 case SCTP_STATE_COOKIE_ECHOED:
5683                         /*
5684                          * we consider data with valid tags in this state
5685                          * shows us the cookie-ack was lost. Imply it was
5686                          * there.
5687                          */
5688                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5689                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5690                                     stcb->asoc.overall_error_count,
5691                                     0,
5692                                     SCTP_FROM_SCTP_INPUT,
5693                                     __LINE__);
5694                         }
5695                         stcb->asoc.overall_error_count = 0;
5696                         sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net);
5697                         break;
5698                 case SCTP_STATE_COOKIE_WAIT:
5699                         /*
5700                          * We consider OOTB any data sent during asoc setup.
5701                          */
5702                         sctp_handle_ootb(m, iphlen, offset, sh, inp,
5703                             vrf_id, port);
5704                         SCTP_TCB_UNLOCK(stcb);
5705                         goto out_now;
5706                         /* sa_ignore NOTREACHED */
5707                         break;
5708                 case SCTP_STATE_EMPTY:  /* should not happen */
5709                 case SCTP_STATE_INUSE:  /* should not happen */
5710                 case SCTP_STATE_SHUTDOWN_RECEIVED:      /* This is a peer error */
5711                 case SCTP_STATE_SHUTDOWN_ACK_SENT:
5712                 default:
5713                         SCTP_TCB_UNLOCK(stcb);
5714                         goto out_now;
5715                         /* sa_ignore NOTREACHED */
5716                         break;
5717                 case SCTP_STATE_OPEN:
5718                 case SCTP_STATE_SHUTDOWN_SENT:
5719                         break;
5720                 }
5721                 /* plow through the data chunks while length > offset */
5722                 retval = sctp_process_data(mm, iphlen, &offset, length, sh,
5723                     inp, stcb, net, &high_tsn);
5724                 if (retval == 2) {
5725                         /*
5726                          * The association aborted, NO UNLOCK needed since
5727                          * the association is destroyed.
5728                          */
5729                         goto out_now;
5730                 }
5731                 data_processed = 1;
5732                 /*
5733                  * Anything important needs to have been m_copy'ed in
5734                  * process_data
5735                  */
5736         }
5737         /* take care of ecn */
5738         if ((data_processed == 1) &&
5739             (stcb->asoc.ecn_allowed == 1) &&
5740             ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) {
5741                 /* Yep, we need to add a ECNE */
5742                 sctp_send_ecn_echo(stcb, net, high_tsn);
5743         }
5744         if ((data_processed == 0) && (fwd_tsn_seen)) {
5745                 int was_a_gap;
5746                 uint32_t highest_tsn;
5747
5748                 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) {
5749                         highest_tsn = stcb->asoc.highest_tsn_inside_nr_map;
5750                 } else {
5751                         highest_tsn = stcb->asoc.highest_tsn_inside_map;
5752                 }
5753                 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn);
5754                 stcb->asoc.send_sack = 1;
5755                 sctp_sack_check(stcb, was_a_gap);
5756         } else if (fwd_tsn_seen) {
5757                 stcb->asoc.send_sack = 1;
5758         }
5759         /* trigger send of any chunks in queue... */
5760 trigger_send:
5761 #ifdef SCTP_AUDITING_ENABLED
5762         sctp_audit_log(0xE0, 2);
5763         sctp_auditing(1, inp, stcb, net);
5764 #endif
5765         SCTPDBG(SCTP_DEBUG_INPUT1,
5766             "Check for chunk output prw:%d tqe:%d tf=%d\n",
5767             stcb->asoc.peers_rwnd,
5768             TAILQ_EMPTY(&stcb->asoc.control_send_queue),
5769             stcb->asoc.total_flight);
5770         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
5771         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
5772                 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq;
5773         }
5774         if (cnt_ctrl_ready ||
5775             ((un_sent) &&
5776             (stcb->asoc.peers_rwnd > 0 ||
5777             (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) {
5778                 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n");
5779                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
5780                 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n");
5781         }
5782 #ifdef SCTP_AUDITING_ENABLED
5783         sctp_audit_log(0xE0, 3);
5784         sctp_auditing(2, inp, stcb, net);
5785 #endif
5786         SCTP_TCB_UNLOCK(stcb);
5787 out_now:
5788 #ifdef INVARIANTS
5789         sctp_validate_no_locks(inp);
5790 #endif
5791         return;
5792 }
5793
5794 #if 0
5795 static void
5796 sctp_print_mbuf_chain(struct mbuf *m)
5797 {
5798         for (; m; m = SCTP_BUF_NEXT(m)) {
5799                 SCTP_PRINTF("%p: m_len = %ld\n", m, SCTP_BUF_LEN(m));
5800                 if (SCTP_BUF_IS_EXTENDED(m))
5801                         SCTP_PRINTF("%p: extend_size = %d\n", m, SCTP_BUF_EXTEND_SIZE(m));
5802         }
5803 }
5804
5805 #endif
5806
5807 #ifdef INET
5808 void
5809 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port)
5810 {
5811         struct mbuf *m;
5812         int iphlen;
5813         uint32_t vrf_id = 0;
5814         uint8_t ecn_bits;
5815         struct ip *ip;
5816         struct sctphdr *sh;
5817         struct sctp_inpcb *inp = NULL;
5818         struct sctp_nets *net;
5819         struct sctp_tcb *stcb = NULL;
5820         struct sctp_chunkhdr *ch;
5821         int refcount_up = 0;
5822         int length, mlen, offset;
5823
5824 #if !defined(SCTP_WITH_NO_CSUM)
5825         uint32_t check, calc_check;
5826
5827 #endif
5828
5829         if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) {
5830                 SCTP_RELEASE_PKT(i_pak);
5831                 return;
5832         }
5833         mlen = SCTP_HEADER_LEN(i_pak);
5834         iphlen = off;
5835         m = SCTP_HEADER_TO_CHAIN(i_pak);
5836
5837         net = NULL;
5838         SCTP_STAT_INCR(sctps_recvpackets);
5839         SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
5840
5841
5842 #ifdef SCTP_MBUF_LOGGING
5843         /* Log in any input mbufs */
5844         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5845                 struct mbuf *mat;
5846
5847                 for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
5848                         if (SCTP_BUF_IS_EXTENDED(mat)) {
5849                                 sctp_log_mb(mat, SCTP_MBUF_INPUT);
5850                         }
5851                 }
5852         }
5853 #endif
5854 #ifdef  SCTP_PACKET_LOGGING
5855         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
5856                 sctp_packet_log(m, mlen);
5857 #endif
5858         /*
5859          * Must take out the iphlen, since mlen expects this (only effect lb
5860          * case)
5861          */
5862         mlen -= iphlen;
5863
5864         /*
5865          * Get IP, SCTP, and first chunk header together in first mbuf.
5866          */
5867         ip = mtod(m, struct ip *);
5868         offset = iphlen + sizeof(*sh) + sizeof(*ch);
5869         if (SCTP_BUF_LEN(m) < offset) {
5870                 if ((m = m_pullup(m, offset)) == 0) {
5871                         SCTP_STAT_INCR(sctps_hdrops);
5872                         return;
5873                 }
5874                 ip = mtod(m, struct ip *);
5875         }
5876         /* validate mbuf chain length with IP payload length */
5877         if (mlen < (SCTP_GET_IPV4_LENGTH(ip) - iphlen)) {
5878                 SCTP_STAT_INCR(sctps_hdrops);
5879                 goto bad;
5880         }
5881         sh = (struct sctphdr *)((caddr_t)ip + iphlen);
5882         ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(*sh));
5883         SCTPDBG(SCTP_DEBUG_INPUT1,
5884             "sctp_input() length:%d iphlen:%d\n", mlen, iphlen);
5885
5886         /* SCTP does not allow broadcasts or multicasts */
5887         if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
5888                 goto bad;
5889         }
5890         if (SCTP_IS_IT_BROADCAST(ip->ip_dst, m)) {
5891                 /*
5892                  * We only look at broadcast if its a front state, All
5893                  * others we will not have a tcb for anyway.
5894                  */
5895                 goto bad;
5896         }
5897         /* validate SCTP checksum */
5898         SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
5899             "sctp_input(): Packet of length %d received on %s with csum_flags 0x%x.\n",
5900             m->m_pkthdr.len,
5901             if_name(m->m_pkthdr.rcvif),
5902             m->m_pkthdr.csum_flags);
5903 #if defined(SCTP_WITH_NO_CSUM)
5904         SCTP_STAT_INCR(sctps_recvnocrc);
5905 #else
5906         if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
5907                 SCTP_STAT_INCR(sctps_recvhwcrc);
5908                 goto sctp_skip_csum_4;
5909         }
5910         check = sh->checksum;   /* save incoming checksum */
5911         sh->checksum = 0;       /* prepare for calc */
5912         calc_check = sctp_calculate_cksum(m, iphlen);
5913         sh->checksum = check;
5914         SCTP_STAT_INCR(sctps_recvswcrc);
5915         if (calc_check != check) {
5916                 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x  m:%p mlen:%d iphlen:%d\n",
5917                     calc_check, check, m, mlen, iphlen);
5918
5919                 stcb = sctp_findassociation_addr(m,
5920                     offset - sizeof(*ch),
5921                     sh, ch, &inp, &net,
5922                     vrf_id);
5923                 if ((net) && (port)) {
5924                         if (net->port == 0) {
5925                                 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr));
5926                         }
5927                         net->port = port;
5928                 }
5929                 if ((net != NULL) && (m->m_flags & M_FLOWID)) {
5930                         net->flowid = m->m_pkthdr.flowid;
5931 #ifdef INVARIANTS
5932                         net->flowidset = 1;
5933 #endif
5934                 }
5935                 if ((inp) && (stcb)) {
5936                         sctp_send_packet_dropped(stcb, net, m, iphlen, 1);
5937                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED);
5938                 } else if ((inp != NULL) && (stcb == NULL)) {
5939                         refcount_up = 1;
5940                 }
5941                 SCTP_STAT_INCR(sctps_badsum);
5942                 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors);
5943                 goto bad;
5944         }
5945 sctp_skip_csum_4:
5946 #endif
5947         /* destination port of 0 is illegal, based on RFC2960. */
5948         if (sh->dest_port == 0) {
5949                 SCTP_STAT_INCR(sctps_hdrops);
5950                 goto bad;
5951         }
5952         /*
5953          * Locate pcb and tcb for datagram sctp_findassociation_addr() wants
5954          * IP/SCTP/first chunk header...
5955          */
5956         stcb = sctp_findassociation_addr(m, offset - sizeof(*ch),
5957             sh, ch, &inp, &net, vrf_id);
5958         if ((net) && (port)) {
5959                 if (net->port == 0) {
5960                         sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr));
5961                 }
5962                 net->port = port;
5963         }
5964         if ((net != NULL) && (m->m_flags & M_FLOWID)) {
5965                 net->flowid = m->m_pkthdr.flowid;
5966 #ifdef INVARIANTS
5967                 net->flowidset = 1;
5968 #endif
5969         }
5970         /* inp's ref-count increased && stcb locked */
5971         if (inp == NULL) {
5972                 struct sctp_init_chunk *init_chk, chunk_buf;
5973
5974                 SCTP_STAT_INCR(sctps_noport);
5975 #ifdef ICMP_BANDLIM
5976                 /*
5977                  * we use the bandwidth limiting to protect against sending
5978                  * too many ABORTS all at once. In this case these count the
5979                  * same as an ICMP message.
5980                  */
5981                 if (badport_bandlim(0) < 0)
5982                         goto bad;
5983 #endif                          /* ICMP_BANDLIM */
5984                 SCTPDBG(SCTP_DEBUG_INPUT1,
5985                     "Sending a ABORT from packet entry!\n");
5986                 if (ch->chunk_type == SCTP_INITIATION) {
5987                         /*
5988                          * we do a trick here to get the INIT tag, dig in
5989                          * and get the tag from the INIT and put it in the
5990                          * common header.
5991                          */
5992                         init_chk = (struct sctp_init_chunk *)sctp_m_getptr(m,
5993                             iphlen + sizeof(*sh), sizeof(*init_chk),
5994                             (uint8_t *) & chunk_buf);
5995                         if (init_chk != NULL)
5996                                 sh->v_tag = init_chk->init.initiate_tag;
5997                 }
5998                 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
5999                         sctp_send_shutdown_complete2(m, sh, vrf_id, port);
6000                         goto bad;
6001                 }
6002                 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) {
6003                         goto bad;
6004                 }
6005                 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) {
6006                         if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) ||
6007                             ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) &&
6008                             (ch->chunk_type != SCTP_INIT))) {
6009                                 sctp_send_abort(m, iphlen, sh, 0, NULL, vrf_id, port);
6010                         }
6011                 }
6012                 goto bad;
6013         } else if (stcb == NULL) {
6014                 refcount_up = 1;
6015         }
6016 #ifdef IPSEC
6017         /*
6018          * I very much doubt any of the IPSEC stuff will work but I have no
6019          * idea, so I will leave it in place.
6020          */
6021         if (inp && ipsec4_in_reject(m, &inp->ip_inp.inp)) {
6022                 MODULE_GLOBAL(ipsec4stat).in_polvio++;
6023                 SCTP_STAT_INCR(sctps_hdrops);
6024                 goto bad;
6025         }
6026 #endif                          /* IPSEC */
6027
6028         /*
6029          * common chunk processing
6030          */
6031         length = ip->ip_len + iphlen;
6032         offset -= sizeof(struct sctp_chunkhdr);
6033
6034         ecn_bits = ip->ip_tos;
6035
6036         /* sa_ignore NO_NULL_CHK */
6037         sctp_common_input_processing(&m, iphlen, offset, length, sh, ch,
6038             inp, stcb, net, ecn_bits, vrf_id, port);
6039         /* inp's ref-count reduced && stcb unlocked */
6040         if (m) {
6041                 sctp_m_freem(m);
6042         }
6043         if ((inp) && (refcount_up)) {
6044                 /* reduce ref-count */
6045                 SCTP_INP_DECR_REF(inp);
6046         }
6047         return;
6048 bad:
6049         if (stcb) {
6050                 SCTP_TCB_UNLOCK(stcb);
6051         }
6052         if ((inp) && (refcount_up)) {
6053                 /* reduce ref-count */
6054                 SCTP_INP_DECR_REF(inp);
6055         }
6056         if (m) {
6057                 sctp_m_freem(m);
6058         }
6059         return;
6060 }
6061
6062 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
6063 extern int *sctp_cpuarry;
6064
6065 #endif
6066
6067 void
6068 sctp_input(struct mbuf *m, int off)
6069 {
6070 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
6071         struct ip *ip;
6072         struct sctphdr *sh;
6073         int offset;
6074         int cpu_to_use;
6075         uint32_t flowid, tag;
6076
6077         if (mp_ncpus > 1) {
6078                 if (m->m_flags & M_FLOWID) {
6079                         flowid = m->m_pkthdr.flowid;
6080                 } else {
6081                         /*
6082                          * No flow id built by lower layers fix it so we
6083                          * create one.
6084                          */
6085                         ip = mtod(m, struct ip *);
6086                         offset = off + sizeof(*sh);
6087                         if (SCTP_BUF_LEN(m) < offset) {
6088                                 if ((m = m_pullup(m, offset)) == 0) {
6089                                         SCTP_STAT_INCR(sctps_hdrops);
6090                                         return;
6091                                 }
6092                                 ip = mtod(m, struct ip *);
6093                         }
6094                         sh = (struct sctphdr *)((caddr_t)ip + off);
6095                         tag = htonl(sh->v_tag);
6096                         flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port);
6097                         m->m_pkthdr.flowid = flowid;
6098                         m->m_flags |= M_FLOWID;
6099                 }
6100                 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus];
6101                 sctp_queue_to_mcore(m, off, cpu_to_use);
6102                 return;
6103         }
6104 #endif
6105         sctp_input_with_port(m, off, 0);
6106 }
6107
6108 #endif