sys/netinet/sctp_input.c

   1 /*-
   2  * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved.
   3  * Copyright (c) 2008-2011, by Randall Stewart. All rights reserved.
   4  * Copyright (c) 2008-2011, 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 /* $KAME: sctp_input.c,v 1.27 2005/03/06 16:04:17 itojun Exp $   */
  34
  35 #include <sys/cdefs.h>
  36 __FBSDID("$FreeBSD$");
  37
  38 #include <netinet/sctp_os.h>
  39 #include <netinet/sctp_var.h>
  40 #include <netinet/sctp_sysctl.h>
  41 #include <netinet/sctp_pcb.h>
  42 #include <netinet/sctp_header.h>
  43 #include <netinet/sctputil.h>
  44 #include <netinet/sctp_output.h>
  45 #include <netinet/sctp_input.h>
  46 #include <netinet/sctp_auth.h>
  47 #include <netinet/sctp_indata.h>
  48 #include <netinet/sctp_asconf.h>
  49 #include <netinet/sctp_bsd_addr.h>
  50 #include <netinet/sctp_timer.h>
  51 #include <netinet/sctp_crc32.h>
  52 #include <netinet/udp.h>
  53 #include <sys/smp.h>
  54
  55
  56
  57 static void
  58 sctp_stop_all_cookie_timers(struct sctp_tcb *stcb)
  59 {
  60         struct sctp_nets *net;
  61
  62         /*
  63          * This now not only stops all cookie timers it also stops any INIT
  64          * timers as well. This will make sure that the timers are stopped
  65          * in all collision cases.
  66          */
  67         SCTP_TCB_LOCK_ASSERT(stcb);
  68         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
  69                 if (net->rxt_timer.type == SCTP_TIMER_TYPE_COOKIE) {
  70                         sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE,
  71                             stcb->sctp_ep,
  72                             stcb,
  73                             net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_1);
  74                 } else if (net->rxt_timer.type == SCTP_TIMER_TYPE_INIT) {
  75                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT,
  76                             stcb->sctp_ep,
  77                             stcb,
  78                             net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_2);
  79                 }
  80         }
  81 }
  82
  83 /* INIT handler */
  84 static void
  85 sctp_handle_init(struct mbuf *m, int iphlen, int offset, struct sctphdr *sh,
  86     struct sctp_init_chunk *cp, struct sctp_inpcb *inp, struct sctp_tcb *stcb,
  87     struct sctp_nets *net, int *abort_no_unlock, uint32_t vrf_id, uint16_t port)
  88 {
  89         struct sctp_init *init;
  90         struct mbuf *op_err;
  91         uint32_t init_limit;
  92
  93         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_init: handling INIT tcb:%p\n",
  94             stcb);
  95         if (stcb == NULL) {
  96                 SCTP_INP_RLOCK(inp);
  97                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
  98                         goto outnow;
  99                 }
 100         }
 101         op_err = NULL;
 102         init = &cp->init;
 103         /* First are we accepting? */
 104         if ((inp->sctp_socket->so_qlimit == 0) && (stcb == NULL)) {
 105                 SCTPDBG(SCTP_DEBUG_INPUT2,
 106                     "sctp_handle_init: Abort, so_qlimit:%d\n",
 107                     inp->sctp_socket->so_qlimit);
 108                 /*
 109                  * FIX ME ?? What about TCP model and we have a
 110                  * match/restart case? Actually no fix is needed. the lookup
 111                  * will always find the existing assoc so stcb would not be
 112                  * NULL. It may be questionable to do this since we COULD
 113                  * just send back the INIT-ACK and hope that the app did
 114                  * accept()'s by the time the COOKIE was sent. But there is
 115                  * a price to pay for COOKIE generation and I don't want to
 116                  * pay it on the chance that the app will actually do some
 117                  * accepts(). The App just looses and should NOT be in this
 118                  * state :-)
 119                  */
 120                 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err,
 121                     vrf_id, port);
 122                 if (stcb)
 123                         *abort_no_unlock = 1;
 124                 goto outnow;
 125         }
 126         if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_chunk)) {
 127                 /* Invalid length */
 128                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
 129                 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err,
 130                     vrf_id, port);
 131                 if (stcb)
 132                         *abort_no_unlock = 1;
 133                 goto outnow;
 134         }
 135         /* validate parameters */
 136         if (init->initiate_tag == 0) {
 137                 /* protocol error... send abort */
 138                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
 139                 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err,
 140                     vrf_id, port);
 141                 if (stcb)
 142                         *abort_no_unlock = 1;
 143                 goto outnow;
 144         }
 145         if (ntohl(init->a_rwnd) < SCTP_MIN_RWND) {
 146                 /* invalid parameter... send abort */
 147                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
 148                 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err,
 149                     vrf_id, port);
 150                 if (stcb)
 151                         *abort_no_unlock = 1;
 152                 goto outnow;
 153         }
 154         if (init->num_inbound_streams == 0) {
 155                 /* protocol error... send abort */
 156                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
 157                 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err,
 158                     vrf_id, port);
 159                 if (stcb)
 160                         *abort_no_unlock = 1;
 161                 goto outnow;
 162         }
 163         if (init->num_outbound_streams == 0) {
 164                 /* protocol error... send abort */
 165                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
 166                 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err,
 167                     vrf_id, port);
 168                 if (stcb)
 169                         *abort_no_unlock = 1;
 170                 goto outnow;
 171         }
 172         init_limit = offset + ntohs(cp->ch.chunk_length);
 173         if (sctp_validate_init_auth_params(m, offset + sizeof(*cp),
 174             init_limit)) {
 175                 /* auth parameter(s) error... send abort */
 176                 sctp_abort_association(inp, stcb, m, iphlen, sh, NULL, vrf_id, port);
 177                 if (stcb)
 178                         *abort_no_unlock = 1;
 179                 goto outnow;
 180         }
 181         /* send an INIT-ACK w/cookie */
 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 outnow:
 186         if (stcb == NULL) {
 187                 SCTP_INP_RUNLOCK(inp);
 188         }
 189 }
 190
 191 /*
 192  * process peer "INIT/INIT-ACK" chunk returns value < 0 on error
 193  */
 194
 195 int
 196 sctp_is_there_unsent_data(struct sctp_tcb *stcb, int so_locked
 197 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
 198     SCTP_UNUSED
 199 #endif
 200 )
 201 {
 202         int unsent_data = 0;
 203         unsigned int i;
 204         struct sctp_stream_queue_pending *sp;
 205         struct sctp_association *asoc;
 206
 207         /*
 208          * This function returns the number of streams that have true unsent
 209          * data on them. Note that as it looks through it will clean up any
 210          * places that have old data that has been sent but left at top of
 211          * stream queue.
 212          */
 213         asoc = &stcb->asoc;
 214         SCTP_TCB_SEND_LOCK(stcb);
 215         if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
 216                 /* Check to see if some data queued */
 217                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
 218                         /* sa_ignore FREED_MEMORY */
 219                         sp = TAILQ_FIRST(&stcb->asoc.strmout[i].outqueue);
 220                         if (sp == NULL) {
 221                                 continue;
 222                         }
 223                         if ((sp->msg_is_complete) &&
 224                             (sp->length == 0) &&
 225                             (sp->sender_all_done)) {
 226                                 /*
 227                                  * We are doing differed cleanup. Last time
 228                                  * through when we took all the data the
 229                                  * sender_all_done was not set.
 230                                  */
 231                                 if (sp->put_last_out == 0) {
 232                                         SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
 233                                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n",
 234                                             sp->sender_all_done,
 235                                             sp->length,
 236                                             sp->msg_is_complete,
 237                                             sp->put_last_out);
 238                                 }
 239                                 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1);
 240                                 TAILQ_REMOVE(&stcb->asoc.strmout[i].outqueue, sp, next);
 241                                 if (sp->net) {
 242                                         sctp_free_remote_addr(sp->net);
 243                                         sp->net = NULL;
 244                                 }
 245                                 if (sp->data) {
 246                                         sctp_m_freem(sp->data);
 247                                         sp->data = NULL;
 248                                 }
 249                                 sctp_free_a_strmoq(stcb, sp, so_locked);
 250                         } else {
 251                                 unsent_data++;
 252                                 break;
 253                         }
 254                 }
 255         }
 256         SCTP_TCB_SEND_UNLOCK(stcb);
 257         return (unsent_data);
 258 }
 259
 260 static int
 261 sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb,
 262     struct sctp_nets *net)
 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_DG_FAIL, stcb,
 302                                             SCTP_NOTIFY_DATAGRAM_UNSENT, 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, SCTP_NOTIFY_DATAGRAM_UNSENT,
 320                                             sp, SCTP_SO_NOT_LOCKED);
 321                                         if (sp->data) {
 322                                                 sctp_m_freem(sp->data);
 323                                                 sp->data = NULL;
 324                                         }
 325                                         if (sp->net) {
 326                                                 sctp_free_remote_addr(sp->net);
 327                                                 sp->net = NULL;
 328                                         }
 329                                         /* Free the chunk */
 330                                         sctp_free_a_strmoq(stcb, sp, SCTP_SO_NOT_LOCKED);
 331                                         /* sa_ignore FREED_MEMORY */
 332                                 }
 333                         }
 334                 }
 335                 /* cut back the count */
 336                 asoc->pre_open_streams = newcnt;
 337         }
 338         SCTP_TCB_SEND_UNLOCK(stcb);
 339         asoc->strm_realoutsize = asoc->streamoutcnt = asoc->pre_open_streams;
 340
 341         /* EY - nr_sack: initialize highest tsn in nr_mapping_array */
 342         asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
 343         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
 344                 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
 345         }
 346         /* This is the next one we expect */
 347         asoc->str_reset_seq_in = asoc->asconf_seq_in + 1;
 348
 349         asoc->mapping_array_base_tsn = ntohl(init->initial_tsn);
 350         asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in;
 351
 352         asoc->advanced_peer_ack_point = asoc->last_acked_seq;
 353         /* open the requested streams */
 354
 355         if (asoc->strmin != NULL) {
 356                 /* Free the old ones */
 357                 struct sctp_queued_to_read *ctl, *nctl;
 358
 359                 for (i = 0; i < asoc->streamincnt; i++) {
 360                         TAILQ_FOREACH_SAFE(ctl, &asoc->strmin[i].inqueue, next, nctl) {
 361                                 TAILQ_REMOVE(&asoc->strmin[i].inqueue, ctl, next);
 362                                 sctp_free_remote_addr(ctl->whoFrom);
 363                                 ctl->whoFrom = NULL;
 364                                 sctp_m_freem(ctl->data);
 365                                 ctl->data = NULL;
 366                                 sctp_free_a_readq(stcb, ctl);
 367                         }
 368                 }
 369                 SCTP_FREE(asoc->strmin, SCTP_M_STRMI);
 370         }
 371         asoc->streamincnt = ntohs(init->num_outbound_streams);
 372         if (asoc->streamincnt > MAX_SCTP_STREAMS) {
 373                 asoc->streamincnt = MAX_SCTP_STREAMS;
 374         }
 375         SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt *
 376             sizeof(struct sctp_stream_in), SCTP_M_STRMI);
 377         if (asoc->strmin == NULL) {
 378                 /* we didn't get memory for the streams! */
 379                 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n");
 380                 return (-1);
 381         }
 382         for (i = 0; i < asoc->streamincnt; i++) {
 383                 asoc->strmin[i].stream_no = i;
 384                 asoc->strmin[i].last_sequence_delivered = 0xffff;
 385                 /*
 386                  * U-stream ranges will be set when the cookie is unpacked.
 387                  * Or for the INIT sender they are un set (if pr-sctp not
 388                  * supported) when the INIT-ACK arrives.
 389                  */
 390                 TAILQ_INIT(&asoc->strmin[i].inqueue);
 391                 asoc->strmin[i].delivery_started = 0;
 392         }
 393         /*
 394          * load_address_from_init will put the addresses into the
 395          * association when the COOKIE is processed or the INIT-ACK is
 396          * processed. Both types of COOKIE's existing and new call this
 397          * routine. It will remove addresses that are no longer in the
 398          * association (for the restarting case where addresses are
 399          * removed). Up front when the INIT arrives we will discard it if it
 400          * is a restart and new addresses have been added.
 401          */
 402         /* sa_ignore MEMLEAK */
 403         return (0);
 404 }
 405
 406 /*
 407  * INIT-ACK message processing/consumption returns value < 0 on error
 408  */
 409 static int
 410 sctp_process_init_ack(struct mbuf *m, int iphlen, int offset,
 411     struct sctphdr *sh, struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
 412     struct sctp_nets *net, int *abort_no_unlock, uint32_t vrf_id)
 413 {
 414         struct sctp_association *asoc;
 415         struct mbuf *op_err;
 416         int retval, abort_flag;
 417         uint32_t initack_limit;
 418         int nat_friendly = 0;
 419
 420         /* First verify that we have no illegal param's */
 421         abort_flag = 0;
 422         op_err = NULL;
 423
 424         op_err = sctp_arethere_unrecognized_parameters(m,
 425             (offset + sizeof(struct sctp_init_chunk)),
 426             &abort_flag, (struct sctp_chunkhdr *)cp, &nat_friendly);
 427         if (abort_flag) {
 428                 /* Send an abort and notify peer */
 429                 sctp_abort_an_association(stcb->sctp_ep, stcb, SCTP_CAUSE_PROTOCOL_VIOLATION, op_err, SCTP_SO_NOT_LOCKED);
 430                 *abort_no_unlock = 1;
 431                 return (-1);
 432         }
 433         asoc = &stcb->asoc;
 434         asoc->peer_supports_nat = (uint8_t) nat_friendly;
 435         /* process the peer's parameters in the INIT-ACK */
 436         retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb, net);
 437         if (retval < 0) {
 438                 return (retval);
 439         }
 440         initack_limit = offset + ntohs(cp->ch.chunk_length);
 441         /* load all addresses */
 442         if ((retval = sctp_load_addresses_from_init(stcb, m, iphlen,
 443             (offset + sizeof(struct sctp_init_chunk)), initack_limit, sh,
 444             NULL))) {
 445                 /* Huh, we should abort */
 446                 SCTPDBG(SCTP_DEBUG_INPUT1,
 447                     "Load addresses from INIT causes an abort %d\n",
 448                     retval);
 449                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh,
 450                     NULL, 0, net->port);
 451                 *abort_no_unlock = 1;
 452                 return (-1);
 453         }
 454         /* if the peer doesn't support asconf, flush the asconf queue */
 455         if (asoc->peer_supports_asconf == 0) {
 456                 struct sctp_asconf_addr *param, *nparam;
 457
 458                 TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) {
 459                         TAILQ_REMOVE(&asoc->asconf_queue, param, next);
 460                         SCTP_FREE(param, SCTP_M_ASC_ADDR);
 461                 }
 462         }
 463         stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs,
 464             stcb->asoc.local_hmacs);
 465         if (op_err) {
 466                 sctp_queue_op_err(stcb, op_err);
 467                 /* queuing will steal away the mbuf chain to the out queue */
 468                 op_err = NULL;
 469         }
 470         /* extract the cookie and queue it to "echo" it back... */
 471         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 472                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
 473                     stcb->asoc.overall_error_count,
 474                     0,
 475                     SCTP_FROM_SCTP_INPUT,
 476                     __LINE__);
 477         }
 478         stcb->asoc.overall_error_count = 0;
 479         net->error_count = 0;
 480
 481         /*
 482          * Cancel the INIT timer, We do this first before queueing the
 483          * cookie. We always cancel at the primary to assue that we are
 484          * canceling the timer started by the INIT which always goes to the
 485          * primary.
 486          */
 487         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb,
 488             asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4);
 489
 490         /* calculate the RTO */
 491         net->RTO = sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, sctp_align_safe_nocopy,
 492             SCTP_RTT_FROM_NON_DATA);
 493
 494         retval = sctp_send_cookie_echo(m, offset, stcb, net);
 495         if (retval < 0) {
 496                 /*
 497                  * No cookie, we probably should send a op error. But in any
 498                  * case if there is no cookie in the INIT-ACK, we can
 499                  * abandon the peer, its broke.
 500                  */
 501                 if (retval == -3) {
 502                         /* We abort with an error of missing mandatory param */
 503                         op_err =
 504                             sctp_generate_invmanparam(SCTP_CAUSE_MISSING_PARAM);
 505                         if (op_err) {
 506                                 /*
 507                                  * Expand beyond to include the mandatory
 508                                  * param cookie
 509                                  */
 510                                 struct sctp_inv_mandatory_param *mp;
 511
 512                                 SCTP_BUF_LEN(op_err) =
 513                                     sizeof(struct sctp_inv_mandatory_param);
 514                                 mp = mtod(op_err,
 515                                     struct sctp_inv_mandatory_param *);
 516                                 /* Subtract the reserved param */
 517                                 mp->length =
 518                                     htons(sizeof(struct sctp_inv_mandatory_param) - 2);
 519                                 mp->num_param = htonl(1);
 520                                 mp->param = htons(SCTP_STATE_COOKIE);
 521                                 mp->resv = 0;
 522                         }
 523                         sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
 524                             sh, op_err, 0, net->port);
 525                         *abort_no_unlock = 1;
 526                 }
 527                 return (retval);
 528         }
 529         return (0);
 530 }
 531
 532 static void
 533 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp,
 534     struct sctp_tcb *stcb, struct sctp_nets *net)
 535 {
 536         struct sockaddr_storage store;
 537         struct sctp_nets *r_net, *f_net;
 538         struct timeval tv;
 539         int req_prim = 0;
 540         uint16_t old_error_counter;
 541
 542 #ifdef INET
 543         struct sockaddr_in *sin;
 544
 545 #endif
 546 #ifdef INET6
 547         struct sockaddr_in6 *sin6;
 548
 549 #endif
 550
 551         if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) {
 552                 /* Invalid length */
 553                 return;
 554         }
 555         memset(&store, 0, sizeof(store));
 556         switch (cp->heartbeat.hb_info.addr_family) {
 557 #ifdef INET
 558         case AF_INET:
 559                 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) {
 560                         sin = (struct sockaddr_in *)&store;
 561                         sin->sin_family = cp->heartbeat.hb_info.addr_family;
 562                         sin->sin_len = cp->heartbeat.hb_info.addr_len;
 563                         sin->sin_port = stcb->rport;
 564                         memcpy(&sin->sin_addr, cp->heartbeat.hb_info.address,
 565                             sizeof(sin->sin_addr));
 566                 } else {
 567                         return;
 568                 }
 569                 break;
 570 #endif
 571 #ifdef INET6
 572         case AF_INET6:
 573                 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) {
 574                         sin6 = (struct sockaddr_in6 *)&store;
 575                         sin6->sin6_family = cp->heartbeat.hb_info.addr_family;
 576                         sin6->sin6_len = cp->heartbeat.hb_info.addr_len;
 577                         sin6->sin6_port = stcb->rport;
 578                         memcpy(&sin6->sin6_addr, cp->heartbeat.hb_info.address,
 579                             sizeof(sin6->sin6_addr));
 580                 } else {
 581                         return;
 582                 }
 583                 break;
 584 #endif
 585         default:
 586                 return;
 587         }
 588         r_net = sctp_findnet(stcb, (struct sockaddr *)&store);
 589         if (r_net == NULL) {
 590                 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n");
 591                 return;
 592         }
 593         if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) &&
 594             (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) &&
 595             (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) {
 596                 /*
 597                  * If the its a HB and it's random value is correct when can
 598                  * confirm the destination.
 599                  */
 600                 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
 601                 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) {
 602                         stcb->asoc.primary_destination = r_net;
 603                         r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY;
 604                         f_net = TAILQ_FIRST(&stcb->asoc.nets);
 605                         if (f_net != r_net) {
 606                                 /*
 607                                  * first one on the list is NOT the primary
 608                                  * sctp_cmpaddr() is much more efficent if
 609                                  * the primary is the first on the list,
 610                                  * make it so.
 611                                  */
 612                                 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next);
 613                                 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next);
 614                         }
 615                         req_prim = 1;
 616                 }
 617                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
 618                     stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED);
 619                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3);
 620                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
 621         }
 622         old_error_counter = r_net->error_count;
 623         r_net->error_count = 0;
 624         r_net->hb_responded = 1;
 625         tv.tv_sec = cp->heartbeat.hb_info.time_value_1;
 626         tv.tv_usec = cp->heartbeat.hb_info.time_value_2;
 627         /* Now lets do a RTO with this */
 628         r_net->RTO = sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, sctp_align_safe_nocopy,
 629             SCTP_RTT_FROM_NON_DATA);
 630         if (!(r_net->dest_state & SCTP_ADDR_REACHABLE)) {
 631                 r_net->dest_state |= SCTP_ADDR_REACHABLE;
 632                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb,
 633                     SCTP_HEARTBEAT_SUCCESS, (void *)r_net, SCTP_SO_NOT_LOCKED);
 634         }
 635         if (r_net->dest_state & SCTP_ADDR_PF) {
 636                 r_net->dest_state &= ~SCTP_ADDR_PF;
 637                 stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net);
 638         }
 639         if (old_error_counter > 0) {
 640                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3);
 641                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
 642         }
 643         if (r_net == stcb->asoc.primary_destination) {
 644                 if (stcb->asoc.alternate) {
 645                         /* release the alternate, primary is good */
 646                         sctp_free_remote_addr(stcb->asoc.alternate);
 647                         stcb->asoc.alternate = NULL;
 648                 }
 649         }
 650         /* Mobility adaptation */
 651         if (req_prim) {
 652                 if ((sctp_is_mobility_feature_on(stcb->sctp_ep,
 653                     SCTP_MOBILITY_BASE) ||
 654                     sctp_is_mobility_feature_on(stcb->sctp_ep,
 655                     SCTP_MOBILITY_FASTHANDOFF)) &&
 656                     sctp_is_mobility_feature_on(stcb->sctp_ep,
 657                     SCTP_MOBILITY_PRIM_DELETED)) {
 658
 659                         sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED, stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_TIMER + SCTP_LOC_7);
 660                         if (sctp_is_mobility_feature_on(stcb->sctp_ep,
 661                             SCTP_MOBILITY_FASTHANDOFF)) {
 662                                 sctp_assoc_immediate_retrans(stcb,
 663                                     stcb->asoc.primary_destination);
 664                         }
 665                         if (sctp_is_mobility_feature_on(stcb->sctp_ep,
 666                             SCTP_MOBILITY_BASE)) {
 667                                 sctp_move_chunks_from_net(stcb,
 668                                     stcb->asoc.deleted_primary);
 669                         }
 670                         sctp_delete_prim_timer(stcb->sctp_ep, stcb,
 671                             stcb->asoc.deleted_primary);
 672                 }
 673         }
 674 }
 675
 676 static int
 677 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb)
 678 {
 679         /*
 680          * return 0 means we want you to proceed with the abort non-zero
 681          * means no abort processing
 682          */
 683         struct sctpasochead *head;
 684
 685         if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_WAIT) {
 686                 /* generate a new vtag and send init */
 687                 LIST_REMOVE(stcb, sctp_asocs);
 688                 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1);
 689                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
 690                 /*
 691                  * put it in the bucket in the vtag hash of assoc's for the
 692                  * system
 693                  */
 694                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
 695                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
 696                 return (1);
 697         }
 698         if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) {
 699                 /*
 700                  * treat like a case where the cookie expired i.e.: - dump
 701                  * current cookie. - generate a new vtag. - resend init.
 702                  */
 703                 /* generate a new vtag and send init */
 704                 LIST_REMOVE(stcb, sctp_asocs);
 705                 stcb->asoc.state &= ~SCTP_STATE_COOKIE_ECHOED;
 706                 stcb->asoc.state |= SCTP_STATE_COOKIE_WAIT;
 707                 sctp_stop_all_cookie_timers(stcb);
 708                 sctp_toss_old_cookies(stcb, &stcb->asoc);
 709                 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1);
 710                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
 711                 /*
 712                  * put it in the bucket in the vtag hash of assoc's for the
 713                  * system
 714                  */
 715                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
 716                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
 717                 return (1);
 718         }
 719         return (0);
 720 }
 721
 722 static int
 723 sctp_handle_nat_missing_state(struct sctp_tcb *stcb,
 724     struct sctp_nets *net)
 725 {
 726         /*
 727          * return 0 means we want you to proceed with the abort non-zero
 728          * means no abort processing
 729          */
 730         if (stcb->asoc.peer_supports_auth == 0) {
 731                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n");
 732                 return (0);
 733         }
 734         sctp_asconf_send_nat_state_update(stcb, net);
 735         return (1);
 736 }
 737
 738
 739 static void
 740 sctp_handle_abort(struct sctp_abort_chunk *cp,
 741     struct sctp_tcb *stcb, struct sctp_nets *net)
 742 {
 743 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 744         struct socket *so;
 745
 746 #endif
 747         uint16_t len;
 748
 749         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n");
 750         if (stcb == NULL)
 751                 return;
 752
 753         len = ntohs(cp->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_abort_chunk *cpnext;
 760                 struct sctp_missing_nat_state *natc;
 761                 uint16_t cause;
 762
 763                 cpnext = cp;
 764                 cpnext++;
 765                 natc = (struct sctp_missing_nat_state *)cpnext;
 766                 cause = ntohs(natc->cause);
 767                 if (cause == SCTP_CAUSE_NAT_COLLIDING_STATE) {
 768                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n",
 769                             cp->ch.chunk_flags);
 770                         if (sctp_handle_nat_colliding_state(stcb)) {
 771                                 return;
 772                         }
 773                 } else if (cause == SCTP_CAUSE_NAT_MISSING_STATE) {
 774                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n",
 775                             cp->ch.chunk_flags);
 776                         if (sctp_handle_nat_missing_state(stcb, net)) {
 777                                 return;
 778                         }
 779                 }
 780         }
 781         /* stop any receive timers */
 782         sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_6);
 783         /* notify user of the abort and clean up... */
 784         sctp_abort_notification(stcb, 0, SCTP_SO_NOT_LOCKED);
 785         /* free the tcb */
 786 #if defined(SCTP_PANIC_ON_ABORT)
 787         printf("stcb:%p state:%d rport:%d net:%p\n",
 788             stcb, stcb->asoc.state, stcb->rport, net);
 789         if (!(stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET)) {
 790                 panic("Received an ABORT");
 791         } else {
 792                 printf("No panic its in state %x closed\n", stcb->asoc.state);
 793         }
 794 #endif
 795         SCTP_STAT_INCR_COUNTER32(sctps_aborted);
 796         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) ||
 797             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
 798                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 799         }
 800 #ifdef SCTP_ASOCLOG_OF_TSNS
 801         sctp_print_out_track_log(stcb);
 802 #endif
 803 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 804         so = SCTP_INP_SO(stcb->sctp_ep);
 805         atomic_add_int(&stcb->asoc.refcnt, 1);
 806         SCTP_TCB_UNLOCK(stcb);
 807         SCTP_SOCKET_LOCK(so, 1);
 808         SCTP_TCB_LOCK(stcb);
 809         atomic_subtract_int(&stcb->asoc.refcnt, 1);
 810 #endif
 811         stcb->asoc.state |= SCTP_STATE_WAS_ABORTED;
 812         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
 813             SCTP_FROM_SCTP_INPUT + SCTP_LOC_6);
 814 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 815         SCTP_SOCKET_UNLOCK(so, 1);
 816 #endif
 817         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n");
 818 }
 819
 820 static void
 821 sctp_start_net_timers(struct sctp_tcb *stcb)
 822 {
 823         uint32_t cnt_hb_sent;
 824         struct sctp_nets *net;
 825
 826         cnt_hb_sent = 0;
 827         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
 828                 /*
 829                  * For each network start: 1) A pmtu timer. 2) A HB timer 3)
 830                  * If the dest in unconfirmed send a hb as well if under
 831                  * max_hb_burst have been sent.
 832                  */
 833                 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net);
 834                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net);
 835                 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) &&
 836                     (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) {
 837                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
 838                         cnt_hb_sent++;
 839                 }
 840         }
 841         if (cnt_hb_sent) {
 842                 sctp_chunk_output(stcb->sctp_ep, stcb,
 843                     SCTP_OUTPUT_FROM_COOKIE_ACK,
 844                     SCTP_SO_NOT_LOCKED);
 845         }
 846 }
 847
 848
 849 static void
 850 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp,
 851     struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag)
 852 {
 853         struct sctp_association *asoc;
 854         int some_on_streamwheel;
 855
 856 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 857         struct socket *so;
 858
 859 #endif
 860
 861         SCTPDBG(SCTP_DEBUG_INPUT2,
 862             "sctp_handle_shutdown: handling SHUTDOWN\n");
 863         if (stcb == NULL)
 864                 return;
 865         asoc = &stcb->asoc;
 866         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
 867             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
 868                 return;
 869         }
 870         if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) {
 871                 /* Shutdown NOT the expected size */
 872                 return;
 873         } else {
 874                 sctp_update_acked(stcb, cp, net, abort_flag);
 875                 if (*abort_flag) {
 876                         return;
 877                 }
 878         }
 879         if (asoc->control_pdapi) {
 880                 /*
 881                  * With a normal shutdown we assume the end of last record.
 882                  */
 883                 SCTP_INP_READ_LOCK(stcb->sctp_ep);
 884                 asoc->control_pdapi->end_added = 1;
 885                 asoc->control_pdapi->pdapi_aborted = 1;
 886                 asoc->control_pdapi = NULL;
 887                 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
 888 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 889                 so = SCTP_INP_SO(stcb->sctp_ep);
 890                 atomic_add_int(&stcb->asoc.refcnt, 1);
 891                 SCTP_TCB_UNLOCK(stcb);
 892                 SCTP_SOCKET_LOCK(so, 1);
 893                 SCTP_TCB_LOCK(stcb);
 894                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 895                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
 896                         /* assoc was freed while we were unlocked */
 897                         SCTP_SOCKET_UNLOCK(so, 1);
 898                         return;
 899                 }
 900 #endif
 901                 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
 902 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 903                 SCTP_SOCKET_UNLOCK(so, 1);
 904 #endif
 905         }
 906         /* goto SHUTDOWN_RECEIVED state to block new requests */
 907         if (stcb->sctp_socket) {
 908                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
 909                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) &&
 910                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) {
 911                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_RECEIVED);
 912                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
 913                         /*
 914                          * notify upper layer that peer has initiated a
 915                          * shutdown
 916                          */
 917                         sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
 918
 919                         /* reset time */
 920                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
 921                 }
 922         }
 923         if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) {
 924                 /*
 925                  * stop the shutdown timer, since we WILL move to
 926                  * SHUTDOWN-ACK-SENT.
 927                  */
 928                 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_8);
 929         }
 930         /* Now is there unsent data on a stream somewhere? */
 931         some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED);
 932
 933         if (!TAILQ_EMPTY(&asoc->send_queue) ||
 934             !TAILQ_EMPTY(&asoc->sent_queue) ||
 935             some_on_streamwheel) {
 936                 /* By returning we will push more data out */
 937                 return;
 938         } else {
 939                 /* no outstanding data to send, so move on... */
 940                 /* send SHUTDOWN-ACK */
 941                 sctp_send_shutdown_ack(stcb, net);
 942                 /* move to SHUTDOWN-ACK-SENT state */
 943                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
 944                     (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
 945                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 946                 }
 947                 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT);
 948                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
 949                 sctp_stop_timers_for_shutdown(stcb);
 950                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep,
 951                     stcb, net);
 952         }
 953 }
 954
 955 static void
 956 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp,
 957     struct sctp_tcb *stcb,
 958     struct sctp_nets *net)
 959 {
 960         struct sctp_association *asoc;
 961
 962 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 963         struct socket *so;
 964
 965         so = SCTP_INP_SO(stcb->sctp_ep);
 966 #endif
 967         SCTPDBG(SCTP_DEBUG_INPUT2,
 968             "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n");
 969         if (stcb == NULL)
 970                 return;
 971
 972         asoc = &stcb->asoc;
 973         /* process according to association state */
 974         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
 975             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
 976                 /* unexpected SHUTDOWN-ACK... do OOTB handling... */
 977                 sctp_send_shutdown_complete(stcb, net, 1);
 978                 SCTP_TCB_UNLOCK(stcb);
 979                 return;
 980         }
 981         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
 982             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
 983                 /* unexpected SHUTDOWN-ACK... so ignore... */
 984                 SCTP_TCB_UNLOCK(stcb);
 985                 return;
 986         }
 987         if (asoc->control_pdapi) {
 988                 /*
 989                  * With a normal shutdown we assume the end of last record.
 990                  */
 991                 SCTP_INP_READ_LOCK(stcb->sctp_ep);
 992                 asoc->control_pdapi->end_added = 1;
 993                 asoc->control_pdapi->pdapi_aborted = 1;
 994                 asoc->control_pdapi = NULL;
 995                 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
 996 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 997                 atomic_add_int(&stcb->asoc.refcnt, 1);
 998                 SCTP_TCB_UNLOCK(stcb);
 999                 SCTP_SOCKET_LOCK(so, 1);
1000                 SCTP_TCB_LOCK(stcb);
1001                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
1002                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1003                         /* assoc was freed while we were unlocked */
1004                         SCTP_SOCKET_UNLOCK(so, 1);
1005                         return;
1006                 }
1007 #endif
1008                 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
1009 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1010                 SCTP_SOCKET_UNLOCK(so, 1);
1011 #endif
1012         }
1013         /* are the queues empty? */
1014         if (!TAILQ_EMPTY(&asoc->send_queue) ||
1015             !TAILQ_EMPTY(&asoc->sent_queue) ||
1016             !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
1017                 sctp_report_all_outbound(stcb, 0, SCTP_SO_NOT_LOCKED);
1018         }
1019         /* stop the timer */
1020         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9);
1021         /* send SHUTDOWN-COMPLETE */
1022         sctp_send_shutdown_complete(stcb, net, 0);
1023         /* notify upper layer protocol */
1024         if (stcb->sctp_socket) {
1025                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
1026                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1027                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
1028                         /* Set the connected flag to disconnected */
1029                         stcb->sctp_ep->sctp_socket->so_snd.sb_cc = 0;
1030                 }
1031         }
1032         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
1033         /* free the TCB but first save off the ep */
1034 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1035         atomic_add_int(&stcb->asoc.refcnt, 1);
1036         SCTP_TCB_UNLOCK(stcb);
1037         SCTP_SOCKET_LOCK(so, 1);
1038         SCTP_TCB_LOCK(stcb);
1039         atomic_subtract_int(&stcb->asoc.refcnt, 1);
1040 #endif
1041         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1042             SCTP_FROM_SCTP_INPUT + SCTP_LOC_10);
1043 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1044         SCTP_SOCKET_UNLOCK(so, 1);
1045 #endif
1046 }
1047
1048 /*
1049  * Skip past the param header and then we will find the chunk that caused the
1050  * problem. There are two possiblities ASCONF or FWD-TSN other than that and
1051  * our peer must be broken.
1052  */
1053 static void
1054 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr,
1055     struct sctp_nets *net)
1056 {
1057         struct sctp_chunkhdr *chk;
1058
1059         chk = (struct sctp_chunkhdr *)((caddr_t)phdr + sizeof(*phdr));
1060         switch (chk->chunk_type) {
1061         case SCTP_ASCONF_ACK:
1062         case SCTP_ASCONF:
1063                 sctp_asconf_cleanup(stcb, net);
1064                 break;
1065         case SCTP_FORWARD_CUM_TSN:
1066                 stcb->asoc.peer_supports_prsctp = 0;
1067                 break;
1068         default:
1069                 SCTPDBG(SCTP_DEBUG_INPUT2,
1070                     "Peer does not support chunk type %d(%x)??\n",
1071                     chk->chunk_type, (uint32_t) chk->chunk_type);
1072                 break;
1073         }
1074 }
1075
1076 /*
1077  * Skip past the param header and then we will find the param that caused the
1078  * problem.  There are a number of param's in a ASCONF OR the prsctp param
1079  * these will turn of specific features.
1080  */
1081 static void
1082 sctp_process_unrecog_param(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr)
1083 {
1084         struct sctp_paramhdr *pbad;
1085
1086         pbad = phdr + 1;
1087         switch (ntohs(pbad->param_type)) {
1088                 /* pr-sctp draft */
1089         case SCTP_PRSCTP_SUPPORTED:
1090                 stcb->asoc.peer_supports_prsctp = 0;
1091                 break;
1092         case SCTP_SUPPORTED_CHUNK_EXT:
1093                 break;
1094                 /* draft-ietf-tsvwg-addip-sctp */
1095         case SCTP_HAS_NAT_SUPPORT:
1096                 stcb->asoc.peer_supports_nat = 0;
1097                 break;
1098         case SCTP_ADD_IP_ADDRESS:
1099         case SCTP_DEL_IP_ADDRESS:
1100         case SCTP_SET_PRIM_ADDR:
1101                 stcb->asoc.peer_supports_asconf = 0;
1102                 break;
1103         case SCTP_SUCCESS_REPORT:
1104         case SCTP_ERROR_CAUSE_IND:
1105                 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n");
1106                 SCTPDBG(SCTP_DEBUG_INPUT2,
1107                     "Turning off ASCONF to this strange peer\n");
1108                 stcb->asoc.peer_supports_asconf = 0;
1109                 break;
1110         default:
1111                 SCTPDBG(SCTP_DEBUG_INPUT2,
1112                     "Peer does not support param type %d(%x)??\n",
1113                     pbad->param_type, (uint32_t) pbad->param_type);
1114                 break;
1115         }
1116 }
1117
1118 static int
1119 sctp_handle_error(struct sctp_chunkhdr *ch,
1120     struct sctp_tcb *stcb, struct sctp_nets *net)
1121 {
1122         int chklen;
1123         struct sctp_paramhdr *phdr;
1124         uint16_t error_type;
1125         uint16_t error_len;
1126         struct sctp_association *asoc;
1127         int adjust;
1128
1129 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1130         struct socket *so;
1131
1132 #endif
1133
1134         /* parse through all of the errors and process */
1135         asoc = &stcb->asoc;
1136         phdr = (struct sctp_paramhdr *)((caddr_t)ch +
1137             sizeof(struct sctp_chunkhdr));
1138         chklen = ntohs(ch->chunk_length) - sizeof(struct sctp_chunkhdr);
1139         while ((size_t)chklen >= sizeof(struct sctp_paramhdr)) {
1140                 /* Process an Error Cause */
1141                 error_type = ntohs(phdr->param_type);
1142                 error_len = ntohs(phdr->param_length);
1143                 if ((error_len > chklen) || (error_len == 0)) {
1144                         /* invalid param length for this param */
1145                         SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in error param- chunk left:%d errorlen:%d\n",
1146                             chklen, error_len);
1147                         return (0);
1148                 }
1149                 switch (error_type) {
1150                 case SCTP_CAUSE_INVALID_STREAM:
1151                 case SCTP_CAUSE_MISSING_PARAM:
1152                 case SCTP_CAUSE_INVALID_PARAM:
1153                 case SCTP_CAUSE_NO_USER_DATA:
1154                         SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %d back? We have a bug :/ (or do they?)\n",
1155                             error_type);
1156                         break;
1157                 case SCTP_CAUSE_NAT_COLLIDING_STATE:
1158                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n",
1159                             ch->chunk_flags);
1160                         if (sctp_handle_nat_colliding_state(stcb)) {
1161                                 return (0);
1162                         }
1163                         break;
1164                 case SCTP_CAUSE_NAT_MISSING_STATE:
1165                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n",
1166                             ch->chunk_flags);
1167                         if (sctp_handle_nat_missing_state(stcb, net)) {
1168                                 return (0);
1169                         }
1170                         break;
1171                 case SCTP_CAUSE_STALE_COOKIE:
1172                         /*
1173                          * We only act if we have echoed a cookie and are
1174                          * waiting.
1175                          */
1176                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) {
1177                                 int *p;
1178
1179                                 p = (int *)((caddr_t)phdr + sizeof(*phdr));
1180                                 /* Save the time doubled */
1181                                 asoc->cookie_preserve_req = ntohl(*p) << 1;
1182                                 asoc->stale_cookie_count++;
1183                                 if (asoc->stale_cookie_count >
1184                                     asoc->max_init_times) {
1185                                         sctp_abort_notification(stcb, 0, SCTP_SO_NOT_LOCKED);
1186                                         /* now free the asoc */
1187 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1188                                         so = SCTP_INP_SO(stcb->sctp_ep);
1189                                         atomic_add_int(&stcb->asoc.refcnt, 1);
1190                                         SCTP_TCB_UNLOCK(stcb);
1191                                         SCTP_SOCKET_LOCK(so, 1);
1192                                         SCTP_TCB_LOCK(stcb);
1193                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
1194 #endif
1195                                         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1196                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_11);
1197 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1198                                         SCTP_SOCKET_UNLOCK(so, 1);
1199 #endif
1200                                         return (-1);
1201                                 }
1202                                 /* blast back to INIT state */
1203                                 sctp_toss_old_cookies(stcb, &stcb->asoc);
1204                                 asoc->state &= ~SCTP_STATE_COOKIE_ECHOED;
1205                                 asoc->state |= SCTP_STATE_COOKIE_WAIT;
1206                                 sctp_stop_all_cookie_timers(stcb);
1207                                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
1208                         }
1209                         break;
1210                 case SCTP_CAUSE_UNRESOLVABLE_ADDR:
1211                         /*
1212                          * Nothing we can do here, we don't do hostname
1213                          * addresses so if the peer does not like my IPv6
1214                          * (or IPv4 for that matter) it does not matter. If
1215                          * they don't support that type of address, they can
1216                          * NOT possibly get that packet type... i.e. with no
1217                          * IPv6 you can't recieve a IPv6 packet. so we can
1218                          * safely ignore this one. If we ever added support
1219                          * for HOSTNAME Addresses, then we would need to do
1220                          * something here.
1221                          */
1222                         break;
1223                 case SCTP_CAUSE_UNRECOG_CHUNK:
1224                         sctp_process_unrecog_chunk(stcb, phdr, net);
1225                         break;
1226                 case SCTP_CAUSE_UNRECOG_PARAM:
1227                         sctp_process_unrecog_param(stcb, phdr);
1228                         break;
1229                 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN:
1230                         /*
1231                          * We ignore this since the timer will drive out a
1232                          * new cookie anyway and there timer will drive us
1233                          * to send a SHUTDOWN_COMPLETE. We can't send one
1234                          * here since we don't have their tag.
1235                          */
1236                         break;
1237                 case SCTP_CAUSE_DELETING_LAST_ADDR:
1238                 case SCTP_CAUSE_RESOURCE_SHORTAGE:
1239                 case SCTP_CAUSE_DELETING_SRC_ADDR:
1240                         /*
1241                          * We should NOT get these here, but in a
1242                          * ASCONF-ACK.
1243                          */
1244                         SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a Operational Error?<%d>?\n",
1245                             error_type);
1246                         break;
1247                 case SCTP_CAUSE_OUT_OF_RESC:
1248                         /*
1249                          * And what, pray tell do we do with the fact that
1250                          * the peer is out of resources? Not really sure we
1251                          * could do anything but abort. I suspect this
1252                          * should have came WITH an abort instead of in a
1253                          * OP-ERROR.
1254                          */
1255                         break;
1256                 default:
1257                         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown error type = 0x%xh\n",
1258                             error_type);
1259                         break;
1260                 }
1261                 adjust = SCTP_SIZE32(error_len);
1262                 chklen -= adjust;
1263                 phdr = (struct sctp_paramhdr *)((caddr_t)phdr + adjust);
1264         }
1265         return (0);
1266 }
1267
1268 static int
1269 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset,
1270     struct sctphdr *sh, struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
1271     struct sctp_nets *net, int *abort_no_unlock, uint32_t vrf_id)
1272 {
1273         struct sctp_init_ack *init_ack;
1274         struct mbuf *op_err;
1275
1276         SCTPDBG(SCTP_DEBUG_INPUT2,
1277             "sctp_handle_init_ack: handling INIT-ACK\n");
1278
1279         if (stcb == NULL) {
1280                 SCTPDBG(SCTP_DEBUG_INPUT2,
1281                     "sctp_handle_init_ack: TCB is null\n");
1282                 return (-1);
1283         }
1284         if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) {
1285                 /* Invalid length */
1286                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
1287                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh,
1288                     op_err, 0, net->port);
1289                 *abort_no_unlock = 1;
1290                 return (-1);
1291         }
1292         init_ack = &cp->init;
1293         /* validate parameters */
1294         if (init_ack->initiate_tag == 0) {
1295                 /* protocol error... send an abort */
1296                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
1297                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh,
1298                     op_err, 0, net->port);
1299                 *abort_no_unlock = 1;
1300                 return (-1);
1301         }
1302         if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) {
1303                 /* protocol error... send an abort */
1304                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
1305                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh,
1306                     op_err, 0, net->port);
1307                 *abort_no_unlock = 1;
1308                 return (-1);
1309         }
1310         if (init_ack->num_inbound_streams == 0) {
1311                 /* protocol error... send an abort */
1312                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
1313                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh,
1314                     op_err, 0, net->port);
1315                 *abort_no_unlock = 1;
1316                 return (-1);
1317         }
1318         if (init_ack->num_outbound_streams == 0) {
1319                 /* protocol error... send an abort */
1320                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
1321                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh,
1322                     op_err, 0, net->port);
1323                 *abort_no_unlock = 1;
1324                 return (-1);
1325         }
1326         /* process according to association state... */
1327         switch (stcb->asoc.state & SCTP_STATE_MASK) {
1328         case SCTP_STATE_COOKIE_WAIT:
1329                 /* this is the expected state for this chunk */
1330                 /* process the INIT-ACK parameters */
1331                 if (stcb->asoc.primary_destination->dest_state &
1332                     SCTP_ADDR_UNCONFIRMED) {
1333                         /*
1334                          * The primary is where we sent the INIT, we can
1335                          * always consider it confirmed when the INIT-ACK is
1336                          * returned. Do this before we load addresses
1337                          * though.
1338                          */
1339                         stcb->asoc.primary_destination->dest_state &=
1340                             ~SCTP_ADDR_UNCONFIRMED;
1341                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
1342                             stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED);
1343                 }
1344                 if (sctp_process_init_ack(m, iphlen, offset, sh, cp, stcb,
1345                     net, abort_no_unlock, vrf_id) < 0) {
1346                         /* error in parsing parameters */
1347                         return (-1);
1348                 }
1349                 /* update our state */
1350                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n");
1351                 SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_ECHOED);
1352
1353                 /* reset the RTO calc */
1354                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
1355                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
1356                             stcb->asoc.overall_error_count,
1357                             0,
1358                             SCTP_FROM_SCTP_INPUT,
1359                             __LINE__);
1360                 }
1361                 stcb->asoc.overall_error_count = 0;
1362                 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
1363                 /*
1364                  * collapse the init timer back in case of a exponential
1365                  * backoff
1366                  */
1367                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep,
1368                     stcb, net);
1369                 /*
1370                  * the send at the end of the inbound data processing will
1371                  * cause the cookie to be sent
1372                  */
1373                 break;
1374         case SCTP_STATE_SHUTDOWN_SENT:
1375                 /* incorrect state... discard */
1376                 break;
1377         case SCTP_STATE_COOKIE_ECHOED:
1378                 /* incorrect state... discard */
1379                 break;
1380         case SCTP_STATE_OPEN:
1381                 /* incorrect state... discard */
1382                 break;
1383         case SCTP_STATE_EMPTY:
1384         case SCTP_STATE_INUSE:
1385         default:
1386                 /* incorrect state... discard */
1387                 return (-1);
1388                 break;
1389         }
1390         SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n");
1391         return (0);
1392 }
1393
1394 static struct sctp_tcb *
1395 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
1396     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1397     struct sctp_inpcb *inp, struct sctp_nets **netp,
1398     struct sockaddr *init_src, int *notification,
1399     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1400     uint32_t vrf_id, uint16_t port);
1401
1402
1403 /*
1404  * handle a state cookie for an existing association m: input packet mbuf
1405  * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a
1406  * "split" mbuf and the cookie signature does not exist offset: offset into
1407  * mbuf to the cookie-echo chunk
1408  */
1409 static struct sctp_tcb *
1410 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset,
1411     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1412     struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp,
1413     struct sockaddr *init_src, int *notification, sctp_assoc_t * sac_assoc_id,
1414     uint32_t vrf_id, int auth_skipped, uint32_t auth_offset, uint32_t auth_len, uint16_t port)
1415 {
1416         struct sctp_association *asoc;
1417         struct sctp_init_chunk *init_cp, init_buf;
1418         struct sctp_init_ack_chunk *initack_cp, initack_buf;
1419         struct sctp_nets *net;
1420         struct mbuf *op_err;
1421         struct sctp_paramhdr *ph;
1422         int chk_length;
1423         int init_offset, initack_offset, i;
1424         int retval;
1425         int spec_flag = 0;
1426         uint32_t how_indx;
1427
1428         net = *netp;
1429         /* I know that the TCB is non-NULL from the caller */
1430         asoc = &stcb->asoc;
1431         for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) {
1432                 if (asoc->cookie_how[how_indx] == 0)
1433                         break;
1434         }
1435         if (how_indx < sizeof(asoc->cookie_how)) {
1436                 asoc->cookie_how[how_indx] = 1;
1437         }
1438         if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
1439                 /* SHUTDOWN came in after sending INIT-ACK */
1440                 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination);
1441                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
1442                     0, M_DONTWAIT, 1, MT_DATA);
1443                 if (op_err == NULL) {
1444                         /* FOOBAR */
1445                         return (NULL);
1446                 }
1447                 /* Set the len */
1448                 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_paramhdr);
1449                 ph = mtod(op_err, struct sctp_paramhdr *);
1450                 ph->param_type = htons(SCTP_CAUSE_COOKIE_IN_SHUTDOWN);
1451                 ph->param_length = htons(sizeof(struct sctp_paramhdr));
1452                 sctp_send_operr_to(m, iphlen, op_err, cookie->peers_vtag,
1453                     vrf_id, net->port);
1454                 if (how_indx < sizeof(asoc->cookie_how))
1455                         asoc->cookie_how[how_indx] = 2;
1456                 return (NULL);
1457         }
1458         /*
1459          * find and validate the INIT chunk in the cookie (peer's info) the
1460          * INIT should start after the cookie-echo header struct (chunk
1461          * header, state cookie header struct)
1462          */
1463         init_offset = offset += sizeof(struct sctp_cookie_echo_chunk);
1464
1465         init_cp = (struct sctp_init_chunk *)
1466             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
1467             (uint8_t *) & init_buf);
1468         if (init_cp == NULL) {
1469                 /* could not pull a INIT chunk in cookie */
1470                 return (NULL);
1471         }
1472         chk_length = ntohs(init_cp->ch.chunk_length);
1473         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
1474                 return (NULL);
1475         }
1476         /*
1477          * find and validate the INIT-ACK chunk in the cookie (my info) the
1478          * INIT-ACK follows the INIT chunk
1479          */
1480         initack_offset = init_offset + SCTP_SIZE32(chk_length);
1481         initack_cp = (struct sctp_init_ack_chunk *)
1482             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
1483             (uint8_t *) & initack_buf);
1484         if (initack_cp == NULL) {
1485                 /* could not pull INIT-ACK chunk in cookie */
1486                 return (NULL);
1487         }
1488         chk_length = ntohs(initack_cp->ch.chunk_length);
1489         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
1490                 return (NULL);
1491         }
1492         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1493             (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) {
1494                 /*
1495                  * case D in Section 5.2.4 Table 2: MMAA process accordingly
1496                  * to get into the OPEN state
1497                  */
1498                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1499                         /*-
1500                          * Opps, this means that we somehow generated two vtag's
1501                          * the same. I.e. we did:
1502                          *  Us               Peer
1503                          *   <---INIT(tag=a)------
1504                          *   ----INIT-ACK(tag=t)-->
1505                          *   ----INIT(tag=t)------> *1
1506                          *   <---INIT-ACK(tag=a)---
1507                          *   <----CE(tag=t)------------- *2
1508                          *
1509                          * At point *1 we should be generating a different
1510                          * tag t'. Which means we would throw away the CE and send
1511                          * ours instead. Basically this is case C (throw away side).
1512                          */
1513                         if (how_indx < sizeof(asoc->cookie_how))
1514                                 asoc->cookie_how[how_indx] = 17;
1515                         return (NULL);
1516
1517                 }
1518                 switch SCTP_GET_STATE
1519                         (asoc) {
1520                 case SCTP_STATE_COOKIE_WAIT:
1521                 case SCTP_STATE_COOKIE_ECHOED:
1522                         /*
1523                          * INIT was sent but got a COOKIE_ECHO with the
1524                          * correct tags... just accept it...but we must
1525                          * process the init so that we can make sure we have
1526                          * the right seq no's.
1527                          */
1528                         /* First we must process the INIT !! */
1529                         retval = sctp_process_init(init_cp, stcb, net);
1530                         if (retval < 0) {
1531                                 if (how_indx < sizeof(asoc->cookie_how))
1532                                         asoc->cookie_how[how_indx] = 3;
1533                                 return (NULL);
1534                         }
1535                         /* we have already processed the INIT so no problem */
1536                         sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb,
1537                             net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_12);
1538                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_13);
1539                         /* update current state */
1540                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)
1541                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1542                         else
1543                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1544
1545                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1546                         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1547                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1548                                     stcb->sctp_ep, stcb, asoc->primary_destination);
1549                         }
1550                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1551                         sctp_stop_all_cookie_timers(stcb);
1552                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1553                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1554                             (inp->sctp_socket->so_qlimit == 0)
1555                             ) {
1556 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1557                                 struct socket *so;
1558
1559 #endif
1560                                 /*
1561                                  * Here is where collision would go if we
1562                                  * did a connect() and instead got a
1563                                  * init/init-ack/cookie done before the
1564                                  * init-ack came back..
1565                                  */
1566                                 stcb->sctp_ep->sctp_flags |=
1567                                     SCTP_PCB_FLAGS_CONNECTED;
1568 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1569                                 so = SCTP_INP_SO(stcb->sctp_ep);
1570                                 atomic_add_int(&stcb->asoc.refcnt, 1);
1571                                 SCTP_TCB_UNLOCK(stcb);
1572                                 SCTP_SOCKET_LOCK(so, 1);
1573                                 SCTP_TCB_LOCK(stcb);
1574                                 atomic_add_int(&stcb->asoc.refcnt, -1);
1575                                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1576                                         SCTP_SOCKET_UNLOCK(so, 1);
1577                                         return (NULL);
1578                                 }
1579 #endif
1580                                 soisconnected(stcb->sctp_socket);
1581 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1582                                 SCTP_SOCKET_UNLOCK(so, 1);
1583 #endif
1584                         }
1585                         /* notify upper layer */
1586                         *notification = SCTP_NOTIFY_ASSOC_UP;
1587                         /*
1588                          * since we did not send a HB make sure we don't
1589                          * double things
1590                          */
1591                         net->hb_responded = 1;
1592                         net->RTO = sctp_calculate_rto(stcb, asoc, net,
1593                             &cookie->time_entered,
1594                             sctp_align_unsafe_makecopy,
1595                             SCTP_RTT_FROM_NON_DATA);
1596
1597                         if (stcb->asoc.sctp_autoclose_ticks &&
1598                             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) {
1599                                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
1600                                     inp, stcb, NULL);
1601                         }
1602                         break;
1603                 default:
1604                         /*
1605                          * we're in the OPEN state (or beyond), so peer must
1606                          * have simply lost the COOKIE-ACK
1607                          */
1608                         break;
1609                         }       /* end switch */
1610                 sctp_stop_all_cookie_timers(stcb);
1611                 /*
1612                  * We ignore the return code here.. not sure if we should
1613                  * somehow abort.. but we do have an existing asoc. This
1614                  * really should not fail.
1615                  */
1616                 if (sctp_load_addresses_from_init(stcb, m, iphlen,
1617                     init_offset + sizeof(struct sctp_init_chunk),
1618                     initack_offset, sh, init_src)) {
1619                         if (how_indx < sizeof(asoc->cookie_how))
1620                                 asoc->cookie_how[how_indx] = 4;
1621                         return (NULL);
1622                 }
1623                 /* respond with a COOKIE-ACK */
1624                 sctp_toss_old_cookies(stcb, asoc);
1625                 sctp_send_cookie_ack(stcb);
1626                 if (how_indx < sizeof(asoc->cookie_how))
1627                         asoc->cookie_how[how_indx] = 5;
1628                 return (stcb);
1629         }
1630         if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1631             ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag &&
1632             cookie->tie_tag_my_vtag == 0 &&
1633             cookie->tie_tag_peer_vtag == 0) {
1634                 /*
1635                  * case C in Section 5.2.4 Table 2: XMOO silently discard
1636                  */
1637                 if (how_indx < sizeof(asoc->cookie_how))
1638                         asoc->cookie_how[how_indx] = 6;
1639                 return (NULL);
1640         }
1641         /*
1642          * If nat support, and the below and stcb is established, send back
1643          * a ABORT(colliding state) if we are established.
1644          */
1645         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) &&
1646             (asoc->peer_supports_nat) &&
1647             ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1648             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1649             (asoc->peer_vtag == 0)))) {
1650                 /*
1651                  * Special case - Peer's support nat. We may have two init's
1652                  * that we gave out the same tag on since one was not
1653                  * established.. i.e. we get INIT from host-1 behind the nat
1654                  * and we respond tag-a, we get a INIT from host-2 behind
1655                  * the nat and we get tag-a again. Then we bring up host-1
1656                  * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1).
1657                  * Now we have colliding state. We must send an abort here
1658                  * with colliding state indication.
1659                  */
1660                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
1661                     0, M_DONTWAIT, 1, MT_DATA);
1662                 if (op_err == NULL) {
1663                         /* FOOBAR */
1664                         return (NULL);
1665                 }
1666                 /* pre-reserve some space */
1667 #ifdef INET6
1668                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
1669 #else
1670                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
1671 #endif
1672                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
1673                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
1674                 /* Set the len */
1675                 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_paramhdr);
1676                 ph = mtod(op_err, struct sctp_paramhdr *);
1677                 ph->param_type = htons(SCTP_CAUSE_NAT_COLLIDING_STATE);
1678                 ph->param_length = htons(sizeof(struct sctp_paramhdr));
1679                 sctp_send_abort(m, iphlen, sh, 0, op_err, vrf_id, port);
1680                 return (NULL);
1681         }
1682         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1683             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1684             (asoc->peer_vtag == 0))) {
1685                 /*
1686                  * case B in Section 5.2.4 Table 2: MXAA or MOAA my info
1687                  * should be ok, re-accept peer info
1688                  */
1689                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1690                         /*
1691                          * Extension of case C. If we hit this, then the
1692                          * random number generator returned the same vtag
1693                          * when we first sent our INIT-ACK and when we later
1694                          * sent our INIT. The side with the seq numbers that
1695                          * are different will be the one that normnally
1696                          * would have hit case C. This in effect "extends"
1697                          * our vtags in this collision case to be 64 bits.
1698                          * The same collision could occur aka you get both
1699                          * vtag and seq number the same twice in a row.. but
1700                          * is much less likely. If it did happen then we
1701                          * would proceed through and bring up the assoc.. we
1702                          * may end up with the wrong stream setup however..
1703                          * which would be bad.. but there is no way to
1704                          * tell.. until we send on a stream that does not
1705                          * exist :-)
1706                          */
1707                         if (how_indx < sizeof(asoc->cookie_how))
1708                                 asoc->cookie_how[how_indx] = 7;
1709
1710                         return (NULL);
1711                 }
1712                 if (how_indx < sizeof(asoc->cookie_how))
1713                         asoc->cookie_how[how_indx] = 8;
1714                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_14);
1715                 sctp_stop_all_cookie_timers(stcb);
1716                 /*
1717                  * since we did not send a HB make sure we don't double
1718                  * things
1719                  */
1720                 net->hb_responded = 1;
1721                 if (stcb->asoc.sctp_autoclose_ticks &&
1722                     sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
1723                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb,
1724                             NULL);
1725                 }
1726                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1727                 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
1728
1729                 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) {
1730                         /*
1731                          * Ok the peer probably discarded our data (if we
1732                          * echoed a cookie+data). So anything on the
1733                          * sent_queue should be marked for retransmit, we
1734                          * may not get something to kick us so it COULD
1735                          * still take a timeout to move these.. but it can't
1736                          * hurt to mark them.
1737                          */
1738                         struct sctp_tmit_chunk *chk;
1739
1740                         TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
1741                                 if (chk->sent < SCTP_DATAGRAM_RESEND) {
1742                                         chk->sent = SCTP_DATAGRAM_RESEND;
1743                                         sctp_flight_size_decrease(chk);
1744                                         sctp_total_flight_decrease(stcb, chk);
1745                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1746                                         spec_flag++;
1747                                 }
1748                         }
1749
1750                 }
1751                 /* process the INIT info (peer's info) */
1752                 retval = sctp_process_init(init_cp, stcb, net);
1753                 if (retval < 0) {
1754                         if (how_indx < sizeof(asoc->cookie_how))
1755                                 asoc->cookie_how[how_indx] = 9;
1756                         return (NULL);
1757                 }
1758                 if (sctp_load_addresses_from_init(stcb, m, iphlen,
1759                     init_offset + sizeof(struct sctp_init_chunk),
1760                     initack_offset, sh, init_src)) {
1761                         if (how_indx < sizeof(asoc->cookie_how))
1762                                 asoc->cookie_how[how_indx] = 10;
1763                         return (NULL);
1764                 }
1765                 if ((asoc->state & SCTP_STATE_COOKIE_WAIT) ||
1766                     (asoc->state & SCTP_STATE_COOKIE_ECHOED)) {
1767                         *notification = SCTP_NOTIFY_ASSOC_UP;
1768
1769                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1770                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1771                             (inp->sctp_socket->so_qlimit == 0)) {
1772 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1773                                 struct socket *so;
1774
1775 #endif
1776                                 stcb->sctp_ep->sctp_flags |=
1777                                     SCTP_PCB_FLAGS_CONNECTED;
1778 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1779                                 so = SCTP_INP_SO(stcb->sctp_ep);
1780                                 atomic_add_int(&stcb->asoc.refcnt, 1);
1781                                 SCTP_TCB_UNLOCK(stcb);
1782                                 SCTP_SOCKET_LOCK(so, 1);
1783                                 SCTP_TCB_LOCK(stcb);
1784                                 atomic_add_int(&stcb->asoc.refcnt, -1);
1785                                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1786                                         SCTP_SOCKET_UNLOCK(so, 1);
1787                                         return (NULL);
1788                                 }
1789 #endif
1790                                 soisconnected(stcb->sctp_socket);
1791 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1792                                 SCTP_SOCKET_UNLOCK(so, 1);
1793 #endif
1794                         }
1795                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)
1796                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1797                         else
1798                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1799                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1800                 } else if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
1801                         SCTP_STAT_INCR_COUNTER32(sctps_restartestab);
1802                 } else {
1803                         SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1804                 }
1805                 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1806                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1807                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1808                             stcb->sctp_ep, stcb, asoc->primary_destination);
1809                 }
1810                 sctp_stop_all_cookie_timers(stcb);
1811                 sctp_toss_old_cookies(stcb, asoc);
1812                 sctp_send_cookie_ack(stcb);
1813                 if (spec_flag) {
1814                         /*
1815                          * only if we have retrans set do we do this. What
1816                          * this call does is get only the COOKIE-ACK out and
1817                          * then when we return the normal call to
1818                          * sctp_chunk_output will get the retrans out behind
1819                          * this.
1820                          */
1821                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED);
1822                 }
1823                 if (how_indx < sizeof(asoc->cookie_how))
1824                         asoc->cookie_how[how_indx] = 11;
1825
1826                 return (stcb);
1827         }
1828         if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1829             ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) &&
1830             cookie->tie_tag_my_vtag == asoc->my_vtag_nonce &&
1831             cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce &&
1832             cookie->tie_tag_peer_vtag != 0) {
1833                 struct sctpasochead *head;
1834
1835                 if (asoc->peer_supports_nat) {
1836                         /*
1837                          * This is a gross gross hack. just call the
1838                          * cookie_new code since we are allowing a duplicate
1839                          * association. I hope this works...
1840                          */
1841                         return (sctp_process_cookie_new(m, iphlen, offset, sh, cookie, cookie_len,
1842                             inp, netp, init_src, notification,
1843                             auth_skipped, auth_offset, auth_len,
1844                             vrf_id, port));
1845                 }
1846                 /*
1847                  * case A in Section 5.2.4 Table 2: XXMM (peer restarted)
1848                  */
1849                 /* temp code */
1850                 if (how_indx < sizeof(asoc->cookie_how))
1851                         asoc->cookie_how[how_indx] = 12;
1852                 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_15);
1853                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
1854
1855                 *sac_assoc_id = sctp_get_associd(stcb);
1856                 /* notify upper layer */
1857                 *notification = SCTP_NOTIFY_ASSOC_RESTART;
1858                 atomic_add_int(&stcb->asoc.refcnt, 1);
1859                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_OPEN) &&
1860                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
1861                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) {
1862                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1863                 }
1864                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
1865                         SCTP_STAT_INCR_GAUGE32(sctps_restartestab);
1866                 } else if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) {
1867                         SCTP_STAT_INCR_GAUGE32(sctps_collisionestab);
1868                 }
1869                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1870                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1871                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1872                             stcb->sctp_ep, stcb, asoc->primary_destination);
1873
1874                 } else if (!(asoc->state & SCTP_STATE_SHUTDOWN_SENT)) {
1875                         /* move to OPEN state, if not in SHUTDOWN_SENT */
1876                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1877                 }
1878                 asoc->pre_open_streams =
1879                     ntohs(initack_cp->init.num_outbound_streams);
1880                 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
1881                 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
1882                 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
1883
1884                 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
1885
1886                 asoc->str_reset_seq_in = asoc->init_seq_number;
1887
1888                 asoc->advanced_peer_ack_point = asoc->last_acked_seq;
1889                 if (asoc->mapping_array) {
1890                         memset(asoc->mapping_array, 0,
1891                             asoc->mapping_array_size);
1892                 }
1893                 if (asoc->nr_mapping_array) {
1894                         memset(asoc->nr_mapping_array, 0,
1895                             asoc->mapping_array_size);
1896                 }
1897                 SCTP_TCB_UNLOCK(stcb);
1898                 SCTP_INP_INFO_WLOCK();
1899                 SCTP_INP_WLOCK(stcb->sctp_ep);
1900                 SCTP_TCB_LOCK(stcb);
1901                 atomic_add_int(&stcb->asoc.refcnt, -1);
1902                 /* send up all the data */
1903                 SCTP_TCB_SEND_LOCK(stcb);
1904
1905                 sctp_report_all_outbound(stcb, 1, SCTP_SO_NOT_LOCKED);
1906                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
1907                         stcb->asoc.strmout[i].stream_no = i;
1908                         stcb->asoc.strmout[i].next_sequence_sent = 0;
1909                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
1910                 }
1911                 /* process the INIT-ACK info (my info) */
1912                 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
1913                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1914
1915                 /* pull from vtag hash */
1916                 LIST_REMOVE(stcb, sctp_asocs);
1917                 /* re-insert to new vtag position */
1918                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag,
1919                     SCTP_BASE_INFO(hashasocmark))];
1920                 /*
1921                  * put it in the bucket in the vtag hash of assoc's for the
1922                  * system
1923                  */
1924                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
1925
1926                 /* process the INIT info (peer's info) */
1927                 SCTP_TCB_SEND_UNLOCK(stcb);
1928                 SCTP_INP_WUNLOCK(stcb->sctp_ep);
1929                 SCTP_INP_INFO_WUNLOCK();
1930
1931                 retval = sctp_process_init(init_cp, stcb, net);
1932                 if (retval < 0) {
1933                         if (how_indx < sizeof(asoc->cookie_how))
1934                                 asoc->cookie_how[how_indx] = 13;
1935
1936                         return (NULL);
1937                 }
1938                 /*
1939                  * since we did not send a HB make sure we don't double
1940                  * things
1941                  */
1942                 net->hb_responded = 1;
1943
1944                 if (sctp_load_addresses_from_init(stcb, m, iphlen,
1945                     init_offset + sizeof(struct sctp_init_chunk),
1946                     initack_offset, sh, init_src)) {
1947                         if (how_indx < sizeof(asoc->cookie_how))
1948                                 asoc->cookie_how[how_indx] = 14;
1949
1950                         return (NULL);
1951                 }
1952                 /* respond with a COOKIE-ACK */
1953                 sctp_stop_all_cookie_timers(stcb);
1954                 sctp_toss_old_cookies(stcb, asoc);
1955                 sctp_send_cookie_ack(stcb);
1956                 if (how_indx < sizeof(asoc->cookie_how))
1957                         asoc->cookie_how[how_indx] = 15;
1958
1959                 return (stcb);
1960         }
1961         if (how_indx < sizeof(asoc->cookie_how))
1962                 asoc->cookie_how[how_indx] = 16;
1963         /* all other cases... */
1964         return (NULL);
1965 }
1966
1967
1968 /*
1969  * handle a state cookie for a new association m: input packet mbuf chain--
1970  * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf
1971  * and the cookie signature does not exist offset: offset into mbuf to the
1972  * cookie-echo chunk length: length of the cookie chunk to: where the init
1973  * was from returns a new TCB
1974  */
1975 struct sctp_tcb *
1976 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
1977     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1978     struct sctp_inpcb *inp, struct sctp_nets **netp,
1979     struct sockaddr *init_src, int *notification,
1980     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1981     uint32_t vrf_id, uint16_t port)
1982 {
1983         struct sctp_tcb *stcb;
1984         struct sctp_init_chunk *init_cp, init_buf;
1985         struct sctp_init_ack_chunk *initack_cp, initack_buf;
1986         struct sockaddr_storage sa_store;
1987         struct sockaddr *initack_src = (struct sockaddr *)&sa_store;
1988         struct sctp_association *asoc;
1989         int chk_length;
1990         int init_offset, initack_offset, initack_limit;
1991         int retval;
1992         int error = 0;
1993         uint32_t old_tag;
1994         uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE];
1995
1996 #ifdef INET
1997         struct sockaddr_in *sin;
1998
1999 #endif
2000 #ifdef INET6
2001         struct sockaddr_in6 *sin6;
2002
2003 #endif
2004 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2005         struct socket *so;
2006
2007         so = SCTP_INP_SO(inp);
2008 #endif
2009
2010         /*
2011          * find and validate the INIT chunk in the cookie (peer's info) the
2012          * INIT should start after the cookie-echo header struct (chunk
2013          * header, state cookie header struct)
2014          */
2015         init_offset = offset + sizeof(struct sctp_cookie_echo_chunk);
2016         init_cp = (struct sctp_init_chunk *)
2017             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
2018             (uint8_t *) & init_buf);
2019         if (init_cp == NULL) {
2020                 /* could not pull a INIT chunk in cookie */
2021                 SCTPDBG(SCTP_DEBUG_INPUT1,
2022                     "process_cookie_new: could not pull INIT chunk hdr\n");
2023                 return (NULL);
2024         }
2025         chk_length = ntohs(init_cp->ch.chunk_length);
2026         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
2027                 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n");
2028                 return (NULL);
2029         }
2030         initack_offset = init_offset + SCTP_SIZE32(chk_length);
2031         /*
2032          * find and validate the INIT-ACK chunk in the cookie (my info) the
2033          * INIT-ACK follows the INIT chunk
2034          */
2035         initack_cp = (struct sctp_init_ack_chunk *)
2036             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
2037             (uint8_t *) & initack_buf);
2038         if (initack_cp == NULL) {
2039                 /* could not pull INIT-ACK chunk in cookie */
2040                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n");
2041                 return (NULL);
2042         }
2043         chk_length = ntohs(initack_cp->ch.chunk_length);
2044         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
2045                 return (NULL);
2046         }
2047         /*
2048          * NOTE: We can't use the INIT_ACK's chk_length to determine the
2049          * "initack_limit" value.  This is because the chk_length field
2050          * includes the length of the cookie, but the cookie is omitted when
2051          * the INIT and INIT_ACK are tacked onto the cookie...
2052          */
2053         initack_limit = offset + cookie_len;
2054
2055         /*
2056          * now that we know the INIT/INIT-ACK are in place, create a new TCB
2057          * and popluate
2058          */
2059
2060         /*
2061          * Here we do a trick, we set in NULL for the proc/thread argument.
2062          * We do this since in effect we only use the p argument when the
2063          * socket is unbound and we must do an implicit bind. Since we are
2064          * getting a cookie, we cannot be unbound.
2065          */
2066         stcb = sctp_aloc_assoc(inp, init_src, &error,
2067             ntohl(initack_cp->init.initiate_tag), vrf_id,
2068             (struct thread *)NULL
2069             );
2070         if (stcb == NULL) {
2071                 struct mbuf *op_err;
2072
2073                 /* memory problem? */
2074                 SCTPDBG(SCTP_DEBUG_INPUT1,
2075                     "process_cookie_new: no room for another TCB!\n");
2076                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC);
2077
2078                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2079                     sh, op_err, vrf_id, port);
2080                 return (NULL);
2081         }
2082         /* get the correct sctp_nets */
2083         if (netp)
2084                 *netp = sctp_findnet(stcb, init_src);
2085
2086         asoc = &stcb->asoc;
2087         /* get scope variables out of cookie */
2088         asoc->ipv4_local_scope = cookie->ipv4_scope;
2089         asoc->site_scope = cookie->site_scope;
2090         asoc->local_scope = cookie->local_scope;
2091         asoc->loopback_scope = cookie->loopback_scope;
2092
2093         if ((asoc->ipv4_addr_legal != cookie->ipv4_addr_legal) ||
2094             (asoc->ipv6_addr_legal != cookie->ipv6_addr_legal)) {
2095                 struct mbuf *op_err;
2096
2097                 /*
2098                  * Houston we have a problem. The EP changed while the
2099                  * cookie was in flight. Only recourse is to abort the
2100                  * association.
2101                  */
2102                 atomic_add_int(&stcb->asoc.refcnt, 1);
2103                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC);
2104                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2105                     sh, op_err, vrf_id, port);
2106 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2107                 SCTP_TCB_UNLOCK(stcb);
2108                 SCTP_SOCKET_LOCK(so, 1);
2109                 SCTP_TCB_LOCK(stcb);
2110 #endif
2111                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2112                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
2113 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2114                 SCTP_SOCKET_UNLOCK(so, 1);
2115 #endif
2116                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2117                 return (NULL);
2118         }
2119         /* process the INIT-ACK info (my info) */
2120         old_tag = asoc->my_vtag;
2121         asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
2122         asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
2123         asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
2124         asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
2125         asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
2126         asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
2127         asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
2128         asoc->str_reset_seq_in = asoc->init_seq_number;
2129
2130         asoc->advanced_peer_ack_point = asoc->last_acked_seq;
2131
2132         /* process the INIT info (peer's info) */
2133         if (netp)
2134                 retval = sctp_process_init(init_cp, stcb, *netp);
2135         else
2136                 retval = 0;
2137         if (retval < 0) {
2138                 atomic_add_int(&stcb->asoc.refcnt, 1);
2139 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2140                 SCTP_TCB_UNLOCK(stcb);
2141                 SCTP_SOCKET_LOCK(so, 1);
2142                 SCTP_TCB_LOCK(stcb);
2143 #endif
2144                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
2145 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2146                 SCTP_SOCKET_UNLOCK(so, 1);
2147 #endif
2148                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2149                 return (NULL);
2150         }
2151         /* load all addresses */
2152         if (sctp_load_addresses_from_init(stcb, m, iphlen,
2153             init_offset + sizeof(struct sctp_init_chunk), initack_offset, sh,
2154             init_src)) {
2155                 atomic_add_int(&stcb->asoc.refcnt, 1);
2156 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2157                 SCTP_TCB_UNLOCK(stcb);
2158                 SCTP_SOCKET_LOCK(so, 1);
2159                 SCTP_TCB_LOCK(stcb);
2160 #endif
2161                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_17);
2162 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2163                 SCTP_SOCKET_UNLOCK(so, 1);
2164 #endif
2165                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2166                 return (NULL);
2167         }
2168         /*
2169          * verify any preceding AUTH chunk that was skipped
2170          */
2171         /* pull the local authentication parameters from the cookie/init-ack */
2172         sctp_auth_get_cookie_params(stcb, m,
2173             initack_offset + sizeof(struct sctp_init_ack_chunk),
2174             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)));
2175         if (auth_skipped) {
2176                 struct sctp_auth_chunk *auth;
2177
2178                 auth = (struct sctp_auth_chunk *)
2179                     sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf);
2180                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) {
2181                         /* auth HMAC failed, dump the assoc and packet */
2182                         SCTPDBG(SCTP_DEBUG_AUTH1,
2183                             "COOKIE-ECHO: AUTH failed\n");
2184                         atomic_add_int(&stcb->asoc.refcnt, 1);
2185 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2186                         SCTP_TCB_UNLOCK(stcb);
2187                         SCTP_SOCKET_LOCK(so, 1);
2188                         SCTP_TCB_LOCK(stcb);
2189 #endif
2190                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_18);
2191 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2192                         SCTP_SOCKET_UNLOCK(so, 1);
2193 #endif
2194                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
2195                         return (NULL);
2196                 } else {
2197                         /* remaining chunks checked... good to go */
2198                         stcb->asoc.authenticated = 1;
2199                 }
2200         }
2201         /* update current state */
2202         SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2203         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
2204         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2205                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2206                     stcb->sctp_ep, stcb, asoc->primary_destination);
2207         }
2208         sctp_stop_all_cookie_timers(stcb);
2209         SCTP_STAT_INCR_COUNTER32(sctps_passiveestab);
2210         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2211
2212         /*
2213          * if we're doing ASCONFs, check to see if we have any new local
2214          * addresses that need to get added to the peer (eg. addresses
2215          * changed while cookie echo in flight).  This needs to be done
2216          * after we go to the OPEN state to do the correct asconf
2217          * processing. else, make sure we have the correct addresses in our
2218          * lists
2219          */
2220
2221         /* warning, we re-use sin, sin6, sa_store here! */
2222         /* pull in local_address (our "from" address) */
2223         switch (cookie->laddr_type) {
2224 #ifdef INET
2225         case SCTP_IPV4_ADDRESS:
2226                 /* source addr is IPv4 */
2227                 sin = (struct sockaddr_in *)initack_src;
2228                 memset(sin, 0, sizeof(*sin));
2229                 sin->sin_family = AF_INET;
2230                 sin->sin_len = sizeof(struct sockaddr_in);
2231                 sin->sin_addr.s_addr = cookie->laddress[0];
2232                 break;
2233 #endif
2234 #ifdef INET6
2235         case SCTP_IPV6_ADDRESS:
2236                 /* source addr is IPv6 */
2237                 sin6 = (struct sockaddr_in6 *)initack_src;
2238                 memset(sin6, 0, sizeof(*sin6));
2239                 sin6->sin6_family = AF_INET6;
2240                 sin6->sin6_len = sizeof(struct sockaddr_in6);
2241                 sin6->sin6_scope_id = cookie->scope_id;
2242                 memcpy(&sin6->sin6_addr, cookie->laddress,
2243                     sizeof(sin6->sin6_addr));
2244                 break;
2245 #endif
2246         default:
2247                 atomic_add_int(&stcb->asoc.refcnt, 1);
2248 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2249                 SCTP_TCB_UNLOCK(stcb);
2250                 SCTP_SOCKET_LOCK(so, 1);
2251                 SCTP_TCB_LOCK(stcb);
2252 #endif
2253                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_19);
2254 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2255                 SCTP_SOCKET_UNLOCK(so, 1);
2256 #endif
2257                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2258                 return (NULL);
2259         }
2260
2261         /* set up to notify upper layer */
2262         *notification = SCTP_NOTIFY_ASSOC_UP;
2263         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2264             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
2265             (inp->sctp_socket->so_qlimit == 0)) {
2266                 /*
2267                  * This is an endpoint that called connect() how it got a
2268                  * cookie that is NEW is a bit of a mystery. It must be that
2269                  * the INIT was sent, but before it got there.. a complete
2270                  * INIT/INIT-ACK/COOKIE arrived. But of course then it
2271                  * should have went to the other code.. not here.. oh well..
2272                  * a bit of protection is worth having..
2273                  */
2274                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2275 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2276                 atomic_add_int(&stcb->asoc.refcnt, 1);
2277                 SCTP_TCB_UNLOCK(stcb);
2278                 SCTP_SOCKET_LOCK(so, 1);
2279                 SCTP_TCB_LOCK(stcb);
2280                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2281                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
2282                         SCTP_SOCKET_UNLOCK(so, 1);
2283                         return (NULL);
2284                 }
2285 #endif
2286                 soisconnected(stcb->sctp_socket);
2287 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2288                 SCTP_SOCKET_UNLOCK(so, 1);
2289 #endif
2290         } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
2291             (inp->sctp_socket->so_qlimit)) {
2292                 /*
2293                  * We don't want to do anything with this one. Since it is
2294                  * the listening guy. The timer will get started for
2295                  * accepted connections in the caller.
2296                  */
2297                 ;
2298         }
2299         /* since we did not send a HB make sure we don't double things */
2300         if ((netp) && (*netp))
2301                 (*netp)->hb_responded = 1;
2302
2303         if (stcb->asoc.sctp_autoclose_ticks &&
2304             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2305                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL);
2306         }
2307         /* calculate the RTT */
2308         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
2309         if ((netp) && (*netp)) {
2310                 (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp,
2311                     &cookie->time_entered, sctp_align_unsafe_makecopy,
2312                     SCTP_RTT_FROM_NON_DATA);
2313         }
2314         /* respond with a COOKIE-ACK */
2315         sctp_send_cookie_ack(stcb);
2316
2317         /*
2318          * check the address lists for any ASCONFs that need to be sent
2319          * AFTER the cookie-ack is sent
2320          */
2321         sctp_check_address_list(stcb, m,
2322             initack_offset + sizeof(struct sctp_init_ack_chunk),
2323             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)),
2324             initack_src, cookie->local_scope, cookie->site_scope,
2325             cookie->ipv4_scope, cookie->loopback_scope);
2326
2327
2328         return (stcb);
2329 }
2330
2331 /*
2332  * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e
2333  * we NEED to make sure we are not already using the vtag. If so we
2334  * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit!
2335         head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag,
2336                                                             SCTP_BASE_INFO(hashasocmark))];
2337         LIST_FOREACH(stcb, head, sctp_asocs) {
2338                 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep))  {
2339                        -- SEND ABORT - TRY AGAIN --
2340                 }
2341         }
2342 */
2343
2344 /*
2345  * handles a COOKIE-ECHO message stcb: modified to either a new or left as
2346  * existing (non-NULL) TCB
2347  */
2348 static struct mbuf *
2349 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset,
2350     struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp,
2351     struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp,
2352     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
2353     struct sctp_tcb **locked_tcb, uint32_t vrf_id, uint16_t port)
2354 {
2355         struct sctp_state_cookie *cookie;
2356         struct sctp_tcb *l_stcb = *stcb;
2357         struct sctp_inpcb *l_inp;
2358         struct sockaddr *to;
2359         sctp_assoc_t sac_restart_id;
2360         struct sctp_pcb *ep;
2361         struct mbuf *m_sig;
2362         uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE];
2363         uint8_t *sig;
2364         uint8_t cookie_ok = 0;
2365         unsigned int size_of_pkt, sig_offset, cookie_offset;
2366         unsigned int cookie_len;
2367         struct timeval now;
2368         struct timeval time_expires;
2369         struct sockaddr_storage dest_store;
2370         struct sockaddr *localep_sa = (struct sockaddr *)&dest_store;
2371         struct ip *iph;
2372         int notification = 0;
2373         struct sctp_nets *netl;
2374         int had_a_existing_tcb = 0;
2375         int send_int_conf = 0;
2376
2377 #ifdef INET
2378         struct sockaddr_in sin;
2379
2380 #endif
2381 #ifdef INET6
2382         struct sockaddr_in6 sin6;
2383
2384 #endif
2385
2386         SCTPDBG(SCTP_DEBUG_INPUT2,
2387             "sctp_handle_cookie: handling COOKIE-ECHO\n");
2388
2389         if (inp_p == NULL) {
2390                 return (NULL);
2391         }
2392         /* First get the destination address setup too. */
2393         iph = mtod(m, struct ip *);
2394         switch (iph->ip_v) {
2395 #ifdef INET
2396         case IPVERSION:
2397                 {
2398                         /* its IPv4 */
2399                         struct sockaddr_in *lsin;
2400
2401                         lsin = (struct sockaddr_in *)(localep_sa);
2402                         memset(lsin, 0, sizeof(*lsin));
2403                         lsin->sin_family = AF_INET;
2404                         lsin->sin_len = sizeof(*lsin);
2405                         lsin->sin_port = sh->dest_port;
2406                         lsin->sin_addr.s_addr = iph->ip_dst.s_addr;
2407                         size_of_pkt = SCTP_GET_IPV4_LENGTH(iph);
2408                         break;
2409                 }
2410 #endif
2411 #ifdef INET6
2412         case IPV6_VERSION >> 4:
2413                 {
2414                         /* its IPv6 */
2415                         struct ip6_hdr *ip6;
2416                         struct sockaddr_in6 *lsin6;
2417
2418                         lsin6 = (struct sockaddr_in6 *)(localep_sa);
2419                         memset(lsin6, 0, sizeof(*lsin6));
2420                         lsin6->sin6_family = AF_INET6;
2421                         lsin6->sin6_len = sizeof(struct sockaddr_in6);
2422                         ip6 = mtod(m, struct ip6_hdr *);
2423                         lsin6->sin6_port = sh->dest_port;
2424                         lsin6->sin6_addr = ip6->ip6_dst;
2425                         size_of_pkt = SCTP_GET_IPV6_LENGTH(ip6) + iphlen;
2426                         break;
2427                 }
2428 #endif
2429         default:
2430                 return (NULL);
2431         }
2432
2433         cookie = &cp->cookie;
2434         cookie_offset = offset + sizeof(struct sctp_chunkhdr);
2435         cookie_len = ntohs(cp->ch.chunk_length);
2436
2437         if ((cookie->peerport != sh->src_port) &&
2438             (cookie->myport != sh->dest_port) &&
2439             (cookie->my_vtag != sh->v_tag)) {
2440                 /*
2441                  * invalid ports or bad tag.  Note that we always leave the
2442                  * v_tag in the header in network order and when we stored
2443                  * it in the my_vtag slot we also left it in network order.
2444                  * This maintains the match even though it may be in the
2445                  * opposite byte order of the machine :->
2446                  */
2447                 return (NULL);
2448         }
2449         if (cookie_len > size_of_pkt ||
2450             cookie_len < sizeof(struct sctp_cookie_echo_chunk) +
2451             sizeof(struct sctp_init_chunk) +
2452             sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) {
2453                 /* cookie too long!  or too small */
2454                 return (NULL);
2455         }
2456         /*
2457          * split off the signature into its own mbuf (since it should not be
2458          * calculated in the sctp_hmac_m() call).
2459          */
2460         sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE;
2461         if (sig_offset > size_of_pkt) {
2462                 /* packet not correct size! */
2463                 /* XXX this may already be accounted for earlier... */
2464                 return (NULL);
2465         }
2466         m_sig = m_split(m, sig_offset, M_DONTWAIT);
2467         if (m_sig == NULL) {
2468                 /* out of memory or ?? */
2469                 return (NULL);
2470         }
2471 #ifdef SCTP_MBUF_LOGGING
2472         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
2473                 struct mbuf *mat;
2474
2475                 mat = m_sig;
2476                 while (mat) {
2477                         if (SCTP_BUF_IS_EXTENDED(mat)) {
2478                                 sctp_log_mb(mat, SCTP_MBUF_SPLIT);
2479                         }
2480                         mat = SCTP_BUF_NEXT(mat);
2481                 }
2482         }
2483 #endif
2484
2485         /*
2486          * compute the signature/digest for the cookie
2487          */
2488         ep = &(*inp_p)->sctp_ep;
2489         l_inp = *inp_p;
2490         if (l_stcb) {
2491                 SCTP_TCB_UNLOCK(l_stcb);
2492         }
2493         SCTP_INP_RLOCK(l_inp);
2494         if (l_stcb) {
2495                 SCTP_TCB_LOCK(l_stcb);
2496         }
2497         /* which cookie is it? */
2498         if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) &&
2499             (ep->current_secret_number != ep->last_secret_number)) {
2500                 /* it's the old cookie */
2501                 (void)sctp_hmac_m(SCTP_HMAC,
2502                     (uint8_t *) ep->secret_key[(int)ep->last_secret_number],
2503                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2504         } else {
2505                 /* it's the current cookie */
2506                 (void)sctp_hmac_m(SCTP_HMAC,
2507                     (uint8_t *) ep->secret_key[(int)ep->current_secret_number],
2508                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2509         }
2510         /* get the signature */
2511         SCTP_INP_RUNLOCK(l_inp);
2512         sig = (uint8_t *) sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *) & tmp_sig);
2513         if (sig == NULL) {
2514                 /* couldn't find signature */
2515                 sctp_m_freem(m_sig);
2516                 return (NULL);
2517         }
2518         /* compare the received digest with the computed digest */
2519         if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) {
2520                 /* try the old cookie? */
2521                 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) &&
2522                     (ep->current_secret_number != ep->last_secret_number)) {
2523                         /* compute digest with old */
2524                         (void)sctp_hmac_m(SCTP_HMAC,
2525                             (uint8_t *) ep->secret_key[(int)ep->last_secret_number],
2526                             SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2527                         /* compare */
2528                         if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0)
2529                                 cookie_ok = 1;
2530                 }
2531         } else {
2532                 cookie_ok = 1;
2533         }
2534
2535         /*
2536          * Now before we continue we must reconstruct our mbuf so that
2537          * normal processing of any other chunks will work.
2538          */
2539         {
2540                 struct mbuf *m_at;
2541
2542                 m_at = m;
2543                 while (SCTP_BUF_NEXT(m_at) != NULL) {
2544                         m_at = SCTP_BUF_NEXT(m_at);
2545                 }
2546                 SCTP_BUF_NEXT(m_at) = m_sig;
2547         }
2548
2549         if (cookie_ok == 0) {
2550                 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n");
2551                 SCTPDBG(SCTP_DEBUG_INPUT2,
2552                     "offset = %u, cookie_offset = %u, sig_offset = %u\n",
2553                     (uint32_t) offset, cookie_offset, sig_offset);
2554                 return (NULL);
2555         }
2556         /*
2557          * check the cookie timestamps to be sure it's not stale
2558          */
2559         (void)SCTP_GETTIME_TIMEVAL(&now);
2560         /* Expire time is in Ticks, so we convert to seconds */
2561         time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life);
2562         time_expires.tv_usec = cookie->time_entered.tv_usec;
2563         /*
2564          * TODO sctp_constants.h needs alternative time macros when _KERNEL
2565          * is undefined.
2566          */
2567         if (timevalcmp(&now, &time_expires, >)) {
2568                 /* cookie is stale! */
2569                 struct mbuf *op_err;
2570                 struct sctp_stale_cookie_msg *scm;
2571                 uint32_t tim;
2572
2573                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_stale_cookie_msg),
2574                     0, M_DONTWAIT, 1, MT_DATA);
2575                 if (op_err == NULL) {
2576                         /* FOOBAR */
2577                         return (NULL);
2578                 }
2579                 /* Set the len */
2580                 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_stale_cookie_msg);
2581                 scm = mtod(op_err, struct sctp_stale_cookie_msg *);
2582                 scm->ph.param_type = htons(SCTP_CAUSE_STALE_COOKIE);
2583                 scm->ph.param_length = htons((sizeof(struct sctp_paramhdr) +
2584                     (sizeof(uint32_t))));
2585                 /* seconds to usec */
2586                 tim = (now.tv_sec - time_expires.tv_sec) * 1000000;
2587                 /* add in usec */
2588                 if (tim == 0)
2589                         tim = now.tv_usec - cookie->time_entered.tv_usec;
2590                 scm->time_usec = htonl(tim);
2591                 sctp_send_operr_to(m, iphlen, op_err, cookie->peers_vtag,
2592                     vrf_id, port);
2593                 return (NULL);
2594         }
2595         /*
2596          * Now we must see with the lookup address if we have an existing
2597          * asoc. This will only happen if we were in the COOKIE-WAIT state
2598          * and a INIT collided with us and somewhere the peer sent the
2599          * cookie on another address besides the single address our assoc
2600          * had for him. In this case we will have one of the tie-tags set at
2601          * least AND the address field in the cookie can be used to look it
2602          * up.
2603          */
2604         to = NULL;
2605         switch (cookie->addr_type) {
2606 #ifdef INET6
2607         case SCTP_IPV6_ADDRESS:
2608                 memset(&sin6, 0, sizeof(sin6));
2609                 sin6.sin6_family = AF_INET6;
2610                 sin6.sin6_len = sizeof(sin6);
2611                 sin6.sin6_port = sh->src_port;
2612                 sin6.sin6_scope_id = cookie->scope_id;
2613                 memcpy(&sin6.sin6_addr.s6_addr, cookie->address,
2614                     sizeof(sin6.sin6_addr.s6_addr));
2615                 to = (struct sockaddr *)&sin6;
2616                 break;
2617 #endif
2618 #ifdef INET
2619         case SCTP_IPV4_ADDRESS:
2620                 memset(&sin, 0, sizeof(sin));
2621                 sin.sin_family = AF_INET;
2622                 sin.sin_len = sizeof(sin);
2623                 sin.sin_port = sh->src_port;
2624                 sin.sin_addr.s_addr = cookie->address[0];
2625                 to = (struct sockaddr *)&sin;
2626                 break;
2627 #endif
2628         default:
2629                 /* This should not happen */
2630                 return (NULL);
2631         }
2632         if ((*stcb == NULL) && to) {
2633                 /* Yep, lets check */
2634                 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, localep_sa, NULL);
2635                 if (*stcb == NULL) {
2636                         /*
2637                          * We should have only got back the same inp. If we
2638                          * got back a different ep we have a problem. The
2639                          * original findep got back l_inp and now
2640                          */
2641                         if (l_inp != *inp_p) {
2642                                 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n");
2643                         }
2644                 } else {
2645                         if (*locked_tcb == NULL) {
2646                                 /*
2647                                  * In this case we found the assoc only
2648                                  * after we locked the create lock. This
2649                                  * means we are in a colliding case and we
2650                                  * must make sure that we unlock the tcb if
2651                                  * its one of the cases where we throw away
2652                                  * the incoming packets.
2653                                  */
2654                                 *locked_tcb = *stcb;
2655
2656                                 /*
2657                                  * We must also increment the inp ref count
2658                                  * since the ref_count flags was set when we
2659                                  * did not find the TCB, now we found it
2660                                  * which reduces the refcount.. we must
2661                                  * raise it back out to balance it all :-)
2662                                  */
2663                                 SCTP_INP_INCR_REF((*stcb)->sctp_ep);
2664                                 if ((*stcb)->sctp_ep != l_inp) {
2665                                         SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n",
2666                                             (*stcb)->sctp_ep, l_inp);
2667                                 }
2668                         }
2669                 }
2670         }
2671         if (to == NULL) {
2672                 return (NULL);
2673         }
2674         cookie_len -= SCTP_SIGNATURE_SIZE;
2675         if (*stcb == NULL) {
2676                 /* this is the "normal" case... get a new TCB */
2677                 *stcb = sctp_process_cookie_new(m, iphlen, offset, sh, cookie,
2678                     cookie_len, *inp_p, netp, to, &notification,
2679                     auth_skipped, auth_offset, auth_len, vrf_id, port);
2680         } else {
2681                 /* this is abnormal... cookie-echo on existing TCB */
2682                 had_a_existing_tcb = 1;
2683                 *stcb = sctp_process_cookie_existing(m, iphlen, offset, sh,
2684                     cookie, cookie_len, *inp_p, *stcb, netp, to,
2685                     &notification, &sac_restart_id, vrf_id, auth_skipped, auth_offset, auth_len, port);
2686         }
2687
2688         if (*stcb == NULL) {
2689                 /* still no TCB... must be bad cookie-echo */
2690                 return (NULL);
2691         }
2692         if ((*netp != NULL) && (m->m_flags & M_FLOWID)) {
2693                 (*netp)->flowid = m->m_pkthdr.flowid;
2694 #ifdef INVARIANTS
2695                 (*netp)->flowidset = 1;
2696 #endif
2697         }
2698         /*
2699          * Ok, we built an association so confirm the address we sent the
2700          * INIT-ACK to.
2701          */
2702         netl = sctp_findnet(*stcb, to);
2703         /*
2704          * This code should in theory NOT run but
2705          */
2706         if (netl == NULL) {
2707                 /* TSNH! Huh, why do I need to add this address here? */
2708                 int ret;
2709
2710                 ret = sctp_add_remote_addr(*stcb, to, NULL, SCTP_DONOT_SETSCOPE,
2711                     SCTP_IN_COOKIE_PROC);
2712                 netl = sctp_findnet(*stcb, to);
2713         }
2714         if (netl) {
2715                 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) {
2716                         netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
2717                         (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL,
2718                             netl);
2719                         send_int_conf = 1;
2720                 }
2721         }
2722         sctp_start_net_timers(*stcb);
2723         if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
2724                 if (!had_a_existing_tcb ||
2725                     (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
2726                         /*
2727                          * If we have a NEW cookie or the connect never
2728                          * reached the connected state during collision we
2729                          * must do the TCP accept thing.
2730                          */
2731                         struct socket *so, *oso;
2732                         struct sctp_inpcb *inp;
2733
2734                         if (notification == SCTP_NOTIFY_ASSOC_RESTART) {
2735                                 /*
2736                                  * For a restart we will keep the same
2737                                  * socket, no need to do anything. I THINK!!
2738                                  */
2739                                 sctp_ulp_notify(notification, *stcb, 0, (void *)&sac_restart_id, SCTP_SO_NOT_LOCKED);
2740                                 if (send_int_conf) {
2741                                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2742                                             (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2743                                 }
2744                                 return (m);
2745                         }
2746                         oso = (*inp_p)->sctp_socket;
2747                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2748                         SCTP_TCB_UNLOCK((*stcb));
2749                         CURVNET_SET(oso->so_vnet);
2750                         so = sonewconn(oso, 0
2751                             );
2752                         CURVNET_RESTORE();
2753                         SCTP_TCB_LOCK((*stcb));
2754                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2755
2756                         if (so == NULL) {
2757                                 struct mbuf *op_err;
2758
2759 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2760                                 struct socket *pcb_so;
2761
2762 #endif
2763                                 /* Too many sockets */
2764                                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n");
2765                                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC);
2766                                 sctp_abort_association(*inp_p, NULL, m, iphlen,
2767                                     sh, op_err, vrf_id, port);
2768 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2769                                 pcb_so = SCTP_INP_SO(*inp_p);
2770                                 atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2771                                 SCTP_TCB_UNLOCK((*stcb));
2772                                 SCTP_SOCKET_LOCK(pcb_so, 1);
2773                                 SCTP_TCB_LOCK((*stcb));
2774                                 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2775 #endif
2776                                 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_20);
2777 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2778                                 SCTP_SOCKET_UNLOCK(pcb_so, 1);
2779 #endif
2780                                 return (NULL);
2781                         }
2782                         inp = (struct sctp_inpcb *)so->so_pcb;
2783                         SCTP_INP_INCR_REF(inp);
2784                         /*
2785                          * We add the unbound flag here so that if we get an
2786                          * soabort() before we get the move_pcb done, we
2787                          * will properly cleanup.
2788                          */
2789                         inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE |
2790                             SCTP_PCB_FLAGS_CONNECTED |
2791                             SCTP_PCB_FLAGS_IN_TCPPOOL |
2792                             SCTP_PCB_FLAGS_UNBOUND |
2793                             (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) |
2794                             SCTP_PCB_FLAGS_DONT_WAKE);
2795                         inp->sctp_features = (*inp_p)->sctp_features;
2796                         inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features;
2797                         inp->sctp_socket = so;
2798                         inp->sctp_frag_point = (*inp_p)->sctp_frag_point;
2799                         inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off;
2800                         inp->sctp_ecn_enable = (*inp_p)->sctp_ecn_enable;
2801                         inp->partial_delivery_point = (*inp_p)->partial_delivery_point;
2802                         inp->sctp_context = (*inp_p)->sctp_context;
2803                         inp->inp_starting_point_for_iterator = NULL;
2804                         /*
2805                          * copy in the authentication parameters from the
2806                          * original endpoint
2807                          */
2808                         if (inp->sctp_ep.local_hmacs)
2809                                 sctp_free_hmaclist(inp->sctp_ep.local_hmacs);
2810                         inp->sctp_ep.local_hmacs =
2811                             sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs);
2812                         if (inp->sctp_ep.local_auth_chunks)
2813                                 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks);
2814                         inp->sctp_ep.local_auth_chunks =
2815                             sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks);
2816
2817                         /*
2818                          * Now we must move it from one hash table to
2819                          * another and get the tcb in the right place.
2820                          */
2821
2822                         /*
2823                          * This is where the one-2-one socket is put into
2824                          * the accept state waiting for the accept!
2825                          */
2826                         if (*stcb) {
2827                                 (*stcb)->asoc.state |= SCTP_STATE_IN_ACCEPT_QUEUE;
2828                         }
2829                         sctp_move_pcb_and_assoc(*inp_p, inp, *stcb);
2830
2831                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2832                         SCTP_TCB_UNLOCK((*stcb));
2833
2834                         sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb,
2835                             0);
2836                         SCTP_TCB_LOCK((*stcb));
2837                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2838
2839
2840                         /*
2841                          * now we must check to see if we were aborted while
2842                          * the move was going on and the lock/unlock
2843                          * happened.
2844                          */
2845                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
2846                                 /*
2847                                  * yep it was, we leave the assoc attached
2848                                  * to the socket since the sctp_inpcb_free()
2849                                  * call will send an abort for us.
2850                                  */
2851                                 SCTP_INP_DECR_REF(inp);
2852                                 return (NULL);
2853                         }
2854                         SCTP_INP_DECR_REF(inp);
2855                         /* Switch over to the new guy */
2856                         *inp_p = inp;
2857                         sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2858                         if (send_int_conf) {
2859                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2860                                     (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2861                         }
2862                         /*
2863                          * Pull it from the incomplete queue and wake the
2864                          * guy
2865                          */
2866 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2867                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2868                         SCTP_TCB_UNLOCK((*stcb));
2869                         SCTP_SOCKET_LOCK(so, 1);
2870 #endif
2871                         soisconnected(so);
2872 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2873                         SCTP_TCB_LOCK((*stcb));
2874                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2875                         SCTP_SOCKET_UNLOCK(so, 1);
2876 #endif
2877                         return (m);
2878                 }
2879         }
2880         if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE) {
2881                 if (notification) {
2882                         sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2883                 }
2884                 if (send_int_conf) {
2885                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2886                             (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2887                 }
2888         }
2889         return (m);
2890 }
2891
2892 static void
2893 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp,
2894     struct sctp_tcb *stcb, struct sctp_nets *net)
2895 {
2896         /* cp must not be used, others call this without a c-ack :-) */
2897         struct sctp_association *asoc;
2898
2899         SCTPDBG(SCTP_DEBUG_INPUT2,
2900             "sctp_handle_cookie_ack: handling COOKIE-ACK\n");
2901         if (stcb == NULL)
2902                 return;
2903
2904         asoc = &stcb->asoc;
2905
2906         sctp_stop_all_cookie_timers(stcb);
2907         /* process according to association state */
2908         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) {
2909                 /* state change only needed when I am in right state */
2910                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2911                 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
2912                 sctp_start_net_timers(stcb);
2913                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2914                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2915                             stcb->sctp_ep, stcb, asoc->primary_destination);
2916
2917                 }
2918                 /* update RTO */
2919                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
2920                 SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2921                 if (asoc->overall_error_count == 0) {
2922                         net->RTO = sctp_calculate_rto(stcb, asoc, net,
2923                             &asoc->time_entered, sctp_align_safe_nocopy,
2924                             SCTP_RTT_FROM_NON_DATA);
2925                 }
2926                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
2927                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2928                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2929                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
2930 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2931                         struct socket *so;
2932
2933 #endif
2934                         stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2935 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2936                         so = SCTP_INP_SO(stcb->sctp_ep);
2937                         atomic_add_int(&stcb->asoc.refcnt, 1);
2938                         SCTP_TCB_UNLOCK(stcb);
2939                         SCTP_SOCKET_LOCK(so, 1);
2940                         SCTP_TCB_LOCK(stcb);
2941                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
2942 #endif
2943                         if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) {
2944                                 soisconnected(stcb->sctp_socket);
2945                         }
2946 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2947                         SCTP_SOCKET_UNLOCK(so, 1);
2948 #endif
2949                 }
2950                 /*
2951                  * since we did not send a HB make sure we don't double
2952                  * things
2953                  */
2954                 net->hb_responded = 1;
2955
2956                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
2957                         /*
2958                          * We don't need to do the asconf thing, nor hb or
2959                          * autoclose if the socket is closed.
2960                          */
2961                         goto closed_socket;
2962                 }
2963                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
2964                     stcb, net);
2965
2966
2967                 if (stcb->asoc.sctp_autoclose_ticks &&
2968                     sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2969                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
2970                             stcb->sctp_ep, stcb, NULL);
2971                 }
2972                 /*
2973                  * send ASCONF if parameters are pending and ASCONFs are
2974                  * allowed (eg. addresses changed when init/cookie echo were
2975                  * in flight)
2976                  */
2977                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) &&
2978                     (stcb->asoc.peer_supports_asconf) &&
2979                     (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) {
2980 #ifdef SCTP_TIMER_BASED_ASCONF
2981                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF,
2982                             stcb->sctp_ep, stcb,
2983                             stcb->asoc.primary_destination);
2984 #else
2985                         sctp_send_asconf(stcb, stcb->asoc.primary_destination,
2986                             SCTP_ADDR_NOT_LOCKED);
2987 #endif
2988                 }
2989         }
2990 closed_socket:
2991         /* Toss the cookie if I can */
2992         sctp_toss_old_cookies(stcb, asoc);
2993         if (!TAILQ_EMPTY(&asoc->sent_queue)) {
2994                 /* Restart the timer if we have pending data */
2995                 struct sctp_tmit_chunk *chk;
2996
2997                 chk = TAILQ_FIRST(&asoc->sent_queue);
2998                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
2999         }
3000 }
3001
3002 static void
3003 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp,
3004     struct sctp_tcb *stcb)
3005 {
3006         struct sctp_nets *net;
3007         struct sctp_tmit_chunk *lchk;
3008         struct sctp_ecne_chunk bkup;
3009         uint8_t override_bit = 0;
3010         uint32_t tsn, window_data_tsn;
3011         int len;
3012         unsigned int pkt_cnt;
3013
3014         len = ntohs(cp->ch.chunk_length);
3015         if ((len != sizeof(struct sctp_ecne_chunk)) &&
3016             (len != sizeof(struct old_sctp_ecne_chunk))) {
3017                 return;
3018         }
3019         if (len == sizeof(struct old_sctp_ecne_chunk)) {
3020                 /* Its the old format */
3021                 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk));
3022                 bkup.num_pkts_since_cwr = htonl(1);
3023                 cp = &bkup;
3024         }
3025         SCTP_STAT_INCR(sctps_recvecne);
3026         tsn = ntohl(cp->tsn);
3027         pkt_cnt = ntohl(cp->num_pkts_since_cwr);
3028         lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead);
3029         if (lchk == NULL) {
3030                 window_data_tsn = stcb->asoc.sending_seq - 1;
3031         } else {
3032                 window_data_tsn = lchk->rec.data.TSN_seq;
3033         }
3034
3035         /* Find where it was sent to if possible. */
3036         net = NULL;
3037         TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) {
3038                 if (lchk->rec.data.TSN_seq == tsn) {
3039                         net = lchk->whoTo;
3040                         net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send;
3041                         break;
3042                 }
3043                 if (SCTP_TSN_GT(lchk->rec.data.TSN_seq, tsn)) {
3044                         break;
3045                 }
3046         }
3047         if (net == NULL) {
3048                 /*
3049                  * What to do. A previous send of a CWR was possibly lost.
3050                  * See how old it is, we may have it marked on the actual
3051                  * net.
3052                  */
3053                 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
3054                         if (tsn == net->last_cwr_tsn) {
3055                                 /* Found him, send it off */
3056                                 goto out;
3057                         }
3058                 }
3059                 /*
3060                  * If we reach here, we need to send a special CWR that says
3061                  * hey, we did this a long time ago and you lost the
3062                  * response.
3063                  */
3064                 net = TAILQ_FIRST(&stcb->asoc.nets);
3065                 override_bit = SCTP_CWR_REDUCE_OVERRIDE;
3066         }
3067 out:
3068         if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) &&
3069             ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
3070                 /*
3071                  * JRS - Use the congestion control given in the pluggable
3072                  * CC module
3073                  */
3074                 int ocwnd;
3075
3076                 ocwnd = net->cwnd;
3077                 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt);
3078                 /*
3079                  * We reduce once every RTT. So we will only lower cwnd at
3080                  * the next sending seq i.e. the window_data_tsn
3081                  */
3082                 net->cwr_window_tsn = window_data_tsn;
3083                 net->ecn_ce_pkt_cnt += pkt_cnt;
3084                 net->lost_cnt = pkt_cnt;
3085                 net->last_cwr_tsn = tsn;
3086         } else {
3087                 override_bit |= SCTP_CWR_IN_SAME_WINDOW;
3088                 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) &&
3089                     ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
3090                         /*
3091                          * Another loss in the same window update how many
3092                          * marks/packets lost we have had.
3093                          */
3094                         int cnt = 1;
3095
3096                         if (pkt_cnt > net->lost_cnt) {
3097                                 /* Should be the case */
3098                                 cnt = (pkt_cnt - net->lost_cnt);
3099                                 net->ecn_ce_pkt_cnt += cnt;
3100                         }
3101                         net->lost_cnt = pkt_cnt;
3102                         net->last_cwr_tsn = tsn;
3103                         /*
3104                          * Most CC functions will ignore this call, since we
3105                          * are in-window yet of the initial CE the peer saw.
3106                          */
3107                         stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt);
3108                 }
3109         }
3110         /*
3111          * We always send a CWR this way if our previous one was lost our
3112          * peer will get an update, or if it is not time again to reduce we
3113          * still get the cwr to the peer. Note we set the override when we
3114          * could not find the TSN on the chunk or the destination network.
3115          */
3116         sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit);
3117 }
3118
3119 static void
3120 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net)
3121 {
3122         /*
3123          * Here we get a CWR from the peer. We must look in the outqueue and
3124          * make sure that we have a covered ECNE in teh control chunk part.
3125          * If so remove it.
3126          */
3127         struct sctp_tmit_chunk *chk;
3128         struct sctp_ecne_chunk *ecne;
3129         int override;
3130         uint32_t cwr_tsn;
3131
3132         cwr_tsn = ntohl(cp->tsn);
3133
3134         override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE;
3135         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
3136                 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) {
3137                         continue;
3138                 }
3139                 if ((override == 0) && (chk->whoTo != net)) {
3140                         /* Must be from the right src unless override is set */
3141                         continue;
3142                 }
3143                 ecne = mtod(chk->data, struct sctp_ecne_chunk *);
3144                 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) {
3145                         /* this covers this ECNE, we can remove it */
3146                         stcb->asoc.ecn_echo_cnt_onq--;
3147                         TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk,
3148                             sctp_next);
3149                         if (chk->data) {
3150                                 sctp_m_freem(chk->data);
3151                                 chk->data = NULL;
3152                         }
3153                         stcb->asoc.ctrl_queue_cnt--;
3154                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3155                         if (override == 0) {
3156                                 break;
3157                         }
3158                 }
3159         }
3160 }
3161
3162 static void
3163 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp,
3164     struct sctp_tcb *stcb, struct sctp_nets *net)
3165 {
3166         struct sctp_association *asoc;
3167
3168 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3169         struct socket *so;
3170
3171 #endif
3172
3173         SCTPDBG(SCTP_DEBUG_INPUT2,
3174             "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n");
3175         if (stcb == NULL)
3176                 return;
3177
3178         asoc = &stcb->asoc;
3179         /* process according to association state */
3180         if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
3181                 /* unexpected SHUTDOWN-COMPLETE... so ignore... */
3182                 SCTPDBG(SCTP_DEBUG_INPUT2,
3183                     "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n");
3184                 SCTP_TCB_UNLOCK(stcb);
3185                 return;
3186         }
3187         /* notify upper layer protocol */
3188         if (stcb->sctp_socket) {
3189                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
3190                 /* are the queues empty? they should be */
3191                 if (!TAILQ_EMPTY(&asoc->send_queue) ||
3192                     !TAILQ_EMPTY(&asoc->sent_queue) ||
3193                     !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
3194                         sctp_report_all_outbound(stcb, 0, SCTP_SO_NOT_LOCKED);
3195                 }
3196         }
3197         /* stop the timer */
3198         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_22);
3199         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
3200         /* free the TCB */
3201         SCTPDBG(SCTP_DEBUG_INPUT2,
3202             "sctp_handle_shutdown_complete: calls free-asoc\n");
3203 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3204         so = SCTP_INP_SO(stcb->sctp_ep);
3205         atomic_add_int(&stcb->asoc.refcnt, 1);
3206         SCTP_TCB_UNLOCK(stcb);
3207         SCTP_SOCKET_LOCK(so, 1);
3208         SCTP_TCB_LOCK(stcb);
3209         atomic_subtract_int(&stcb->asoc.refcnt, 1);
3210 #endif
3211         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_23);
3212 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3213         SCTP_SOCKET_UNLOCK(so, 1);
3214 #endif
3215         return;
3216 }
3217
3218 static int
3219 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc,
3220     struct sctp_nets *net, uint8_t flg)
3221 {
3222         switch (desc->chunk_type) {
3223         case SCTP_DATA:
3224                 /* find the tsn to resend (possibly */
3225                 {
3226                         uint32_t tsn;
3227                         struct sctp_tmit_chunk *tp1;
3228
3229                         tsn = ntohl(desc->tsn_ifany);
3230                         TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3231                                 if (tp1->rec.data.TSN_seq == tsn) {
3232                                         /* found it */
3233                                         break;
3234                                 }
3235                                 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, tsn)) {
3236                                         /* not found */
3237                                         tp1 = NULL;
3238                                         break;
3239                                 }
3240                         }
3241                         if (tp1 == NULL) {
3242                                 /*
3243                                  * Do it the other way , aka without paying
3244                                  * attention to queue seq order.
3245                                  */
3246                                 SCTP_STAT_INCR(sctps_pdrpdnfnd);
3247                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3248                                         if (tp1->rec.data.TSN_seq == tsn) {
3249                                                 /* found it */
3250                                                 break;
3251                                         }
3252                                 }
3253                         }
3254                         if (tp1 == NULL) {
3255                                 SCTP_STAT_INCR(sctps_pdrptsnnf);
3256                         }
3257                         if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) {
3258                                 uint8_t *ddp;
3259
3260                                 if (((flg & SCTP_BADCRC) == 0) &&
3261                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3262                                         return (0);
3263                                 }
3264                                 if ((stcb->asoc.peers_rwnd == 0) &&
3265                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3266                                         SCTP_STAT_INCR(sctps_pdrpdiwnp);
3267                                         return (0);
3268                                 }
3269                                 if (stcb->asoc.peers_rwnd == 0 &&
3270                                     (flg & SCTP_FROM_MIDDLE_BOX)) {
3271                                         SCTP_STAT_INCR(sctps_pdrpdizrw);
3272                                         return (0);
3273                                 }
3274                                 ddp = (uint8_t *) (mtod(tp1->data, caddr_t)+
3275                                     sizeof(struct sctp_data_chunk));
3276                                 {
3277                                         unsigned int iii;
3278
3279                                         for (iii = 0; iii < sizeof(desc->data_bytes);
3280                                             iii++) {
3281                                                 if (ddp[iii] != desc->data_bytes[iii]) {
3282                                                         SCTP_STAT_INCR(sctps_pdrpbadd);
3283                                                         return (-1);
3284                                                 }
3285                                         }
3286                                 }
3287
3288                                 if (tp1->do_rtt) {
3289                                         /*
3290                                          * this guy had a RTO calculation
3291                                          * pending on it, cancel it
3292                                          */
3293                                         if (tp1->whoTo->rto_needed == 0) {
3294                                                 tp1->whoTo->rto_needed = 1;
3295                                         }
3296                                         tp1->do_rtt = 0;
3297                                 }
3298                                 SCTP_STAT_INCR(sctps_pdrpmark);
3299                                 if (tp1->sent != SCTP_DATAGRAM_RESEND)
3300                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3301                                 /*
3302                                  * mark it as if we were doing a FR, since
3303                                  * we will be getting gap ack reports behind
3304                                  * the info from the router.
3305                                  */
3306                                 tp1->rec.data.doing_fast_retransmit = 1;
3307                                 /*
3308                                  * mark the tsn with what sequences can
3309                                  * cause a new FR.
3310                                  */
3311                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) {
3312                                         tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
3313                                 } else {
3314                                         tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq;
3315                                 }
3316
3317                                 /* restart the timer */
3318                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3319                                     stcb, tp1->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_24);
3320                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3321                                     stcb, tp1->whoTo);
3322
3323                                 /* fix counts and things */
3324                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
3325                                         sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP,
3326                                             tp1->whoTo->flight_size,
3327                                             tp1->book_size,
3328                                             (uintptr_t) stcb,
3329                                             tp1->rec.data.TSN_seq);
3330                                 }
3331                                 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
3332                                         sctp_flight_size_decrease(tp1);
3333                                         sctp_total_flight_decrease(stcb, tp1);
3334                                 }
3335                                 tp1->sent = SCTP_DATAGRAM_RESEND;
3336                         } {
3337                                 /* audit code */
3338                                 unsigned int audit;
3339
3340                                 audit = 0;
3341                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3342                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3343                                                 audit++;
3344                                 }
3345                                 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue,
3346                                     sctp_next) {
3347                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3348                                                 audit++;
3349                                 }
3350                                 if (audit != stcb->asoc.sent_queue_retran_cnt) {
3351                                         SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n",
3352                                             audit, stcb->asoc.sent_queue_retran_cnt);
3353 #ifndef SCTP_AUDITING_ENABLED
3354                                         stcb->asoc.sent_queue_retran_cnt = audit;
3355 #endif
3356                                 }
3357                         }
3358                 }
3359                 break;
3360         case SCTP_ASCONF:
3361                 {
3362                         struct sctp_tmit_chunk *asconf;
3363
3364                         TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue,
3365                             sctp_next) {
3366                                 if (asconf->rec.chunk_id.id == SCTP_ASCONF) {
3367                                         break;
3368                                 }
3369                         }
3370                         if (asconf) {
3371                                 if (asconf->sent != SCTP_DATAGRAM_RESEND)
3372                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3373                                 asconf->sent = SCTP_DATAGRAM_RESEND;
3374                                 asconf->snd_count--;
3375                         }
3376                 }
3377                 break;
3378         case SCTP_INITIATION:
3379                 /* resend the INIT */
3380                 stcb->asoc.dropped_special_cnt++;
3381                 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) {
3382                         /*
3383                          * If we can get it in, in a few attempts we do
3384                          * this, otherwise we let the timer fire.
3385                          */
3386                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep,
3387                             stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_25);
3388                         sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
3389                 }
3390                 break;
3391         case SCTP_SELECTIVE_ACK:
3392         case SCTP_NR_SELECTIVE_ACK:
3393                 /* resend the sack */
3394                 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED);
3395                 break;
3396         case SCTP_HEARTBEAT_REQUEST:
3397                 /* resend a demand HB */
3398                 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) {
3399                         /*
3400                          * Only retransmit if we KNOW we wont destroy the
3401                          * tcb
3402                          */
3403                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
3404                 }
3405                 break;
3406         case SCTP_SHUTDOWN:
3407                 sctp_send_shutdown(stcb, net);
3408                 break;
3409         case SCTP_SHUTDOWN_ACK:
3410                 sctp_send_shutdown_ack(stcb, net);
3411                 break;
3412         case SCTP_COOKIE_ECHO:
3413                 {
3414                         struct sctp_tmit_chunk *cookie;
3415
3416                         cookie = NULL;
3417                         TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue,
3418                             sctp_next) {
3419                                 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
3420                                         break;
3421                                 }
3422                         }
3423                         if (cookie) {
3424                                 if (cookie->sent != SCTP_DATAGRAM_RESEND)
3425                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3426                                 cookie->sent = SCTP_DATAGRAM_RESEND;
3427                                 sctp_stop_all_cookie_timers(stcb);
3428                         }
3429                 }
3430                 break;
3431         case SCTP_COOKIE_ACK:
3432                 sctp_send_cookie_ack(stcb);
3433                 break;
3434         case SCTP_ASCONF_ACK:
3435                 /* resend last asconf ack */
3436                 sctp_send_asconf_ack(stcb);
3437                 break;
3438         case SCTP_FORWARD_CUM_TSN:
3439                 send_forward_tsn(stcb, &stcb->asoc);
3440                 break;
3441                 /* can't do anything with these */
3442         case SCTP_PACKET_DROPPED:
3443         case SCTP_INITIATION_ACK:       /* this should not happen */
3444         case SCTP_HEARTBEAT_ACK:
3445         case SCTP_ABORT_ASSOCIATION:
3446         case SCTP_OPERATION_ERROR:
3447         case SCTP_SHUTDOWN_COMPLETE:
3448         case SCTP_ECN_ECHO:
3449         case SCTP_ECN_CWR:
3450         default:
3451                 break;
3452         }
3453         return (0);
3454 }
3455
3456 void
3457 sctp_reset_in_stream(struct sctp_tcb *stcb, int number_entries, uint16_t * list)
3458 {
3459         int i;
3460         uint16_t temp;
3461
3462         /*
3463          * We set things to 0xffff since this is the last delivered sequence
3464          * and we will be sending in 0 after the reset.
3465          */
3466
3467         if (number_entries) {
3468                 for (i = 0; i < number_entries; i++) {
3469                         temp = ntohs(list[i]);
3470                         if (temp >= stcb->asoc.streamincnt) {
3471                                 continue;
3472                         }
3473                         stcb->asoc.strmin[temp].last_sequence_delivered = 0xffff;
3474                 }
3475         } else {
3476                 list = NULL;
3477                 for (i = 0; i < stcb->asoc.streamincnt; i++) {
3478                         stcb->asoc.strmin[i].last_sequence_delivered = 0xffff;
3479                 }
3480         }
3481         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3482 }
3483
3484 static void
3485 sctp_reset_out_streams(struct sctp_tcb *stcb, int number_entries, uint16_t * list)
3486 {
3487         int i;
3488
3489         if (number_entries == 0) {
3490                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3491                         stcb->asoc.strmout[i].next_sequence_sent = 0;
3492                 }
3493         } else if (number_entries) {
3494                 for (i = 0; i < number_entries; i++) {
3495                         uint16_t temp;
3496
3497                         temp = ntohs(list[i]);
3498                         if (temp >= stcb->asoc.streamoutcnt) {
3499                                 /* no such stream */
3500                                 continue;
3501                         }
3502                         stcb->asoc.strmout[temp].next_sequence_sent = 0;
3503                 }
3504         }
3505         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3506 }
3507
3508
3509 struct sctp_stream_reset_out_request *
3510 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk)
3511 {
3512         struct sctp_association *asoc;
3513         struct sctp_stream_reset_out_req *req;
3514         struct sctp_stream_reset_out_request *r;
3515         struct sctp_tmit_chunk *chk;
3516         int len, clen;
3517
3518         asoc = &stcb->asoc;
3519         if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
3520                 asoc->stream_reset_outstanding = 0;
3521                 return (NULL);
3522         }
3523         if (stcb->asoc.str_reset == NULL) {
3524                 asoc->stream_reset_outstanding = 0;
3525                 return (NULL);
3526         }
3527         chk = stcb->asoc.str_reset;
3528         if (chk->data == NULL) {
3529                 return (NULL);
3530         }
3531         if (bchk) {
3532                 /* he wants a copy of the chk pointer */
3533                 *bchk = chk;
3534         }
3535         clen = chk->send_size;
3536         req = mtod(chk->data, struct sctp_stream_reset_out_req *);
3537         r = &req->sr_req;
3538         if (ntohl(r->request_seq) == seq) {
3539                 /* found it */
3540                 return (r);
3541         }
3542         len = SCTP_SIZE32(ntohs(r->ph.param_length));
3543         if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) {
3544                 /* move to the next one, there can only be a max of two */
3545                 r = (struct sctp_stream_reset_out_request *)((caddr_t)r + len);
3546                 if (ntohl(r->request_seq) == seq) {
3547                         return (r);
3548                 }
3549         }
3550         /* that seq is not here */
3551         return (NULL);
3552 }
3553
3554 static void
3555 sctp_clean_up_stream_reset(struct sctp_tcb *stcb)
3556 {
3557         struct sctp_association *asoc;
3558         struct sctp_tmit_chunk *chk = stcb->asoc.str_reset;
3559
3560         if (stcb->asoc.str_reset == NULL) {
3561                 return;
3562         }
3563         asoc = &stcb->asoc;
3564
3565         sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_26);
3566         TAILQ_REMOVE(&asoc->control_send_queue,
3567             chk,
3568             sctp_next);
3569         if (chk->data) {
3570                 sctp_m_freem(chk->data);
3571                 chk->data = NULL;
3572         }
3573         asoc->ctrl_queue_cnt--;
3574         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3575         /* sa_ignore NO_NULL_CHK */
3576         stcb->asoc.str_reset = NULL;
3577 }
3578
3579
3580 static int
3581 sctp_handle_stream_reset_response(struct sctp_tcb *stcb,
3582     uint32_t seq, uint32_t action,
3583     struct sctp_stream_reset_response *respin)
3584 {
3585         uint16_t type;
3586         int lparm_len;
3587         struct sctp_association *asoc = &stcb->asoc;
3588         struct sctp_tmit_chunk *chk;
3589         struct sctp_stream_reset_out_request *srparam;
3590         int number_entries;
3591
3592         if (asoc->stream_reset_outstanding == 0) {
3593                 /* duplicate */
3594                 return (0);
3595         }
3596         if (seq == stcb->asoc.str_reset_seq_out) {
3597                 srparam = sctp_find_stream_reset(stcb, seq, &chk);
3598                 if (srparam) {
3599                         stcb->asoc.str_reset_seq_out++;
3600                         type = ntohs(srparam->ph.param_type);
3601                         lparm_len = ntohs(srparam->ph.param_length);
3602                         if (type == SCTP_STR_RESET_OUT_REQUEST) {
3603                                 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t);
3604                                 asoc->stream_reset_out_is_outstanding = 0;
3605                                 if (asoc->stream_reset_outstanding)
3606                                         asoc->stream_reset_outstanding--;
3607                                 if (action == SCTP_STREAM_RESET_PERFORMED) {
3608                                         /* do it */
3609                                         sctp_reset_out_streams(stcb, number_entries, srparam->list_of_streams);
3610                                 } else {
3611                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED);
3612                                 }
3613                         } else if (type == SCTP_STR_RESET_IN_REQUEST) {
3614                                 /* Answered my request */
3615                                 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t);
3616                                 if (asoc->stream_reset_outstanding)
3617                                         asoc->stream_reset_outstanding--;
3618                                 if (action != SCTP_STREAM_RESET_PERFORMED) {
3619                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb, number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED);
3620                                 }
3621                         } else if (type == SCTP_STR_RESET_ADD_STREAMS) {
3622                                 /* Ok we now may have more streams */
3623                                 if (asoc->stream_reset_outstanding)
3624                                         asoc->stream_reset_outstanding--;
3625                                 if (action == SCTP_STREAM_RESET_PERFORMED) {
3626                                         /* Put the new streams into effect */
3627                                         stcb->asoc.streamoutcnt = stcb->asoc.strm_realoutsize;
3628                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_ADD_OK, stcb,
3629                                             (uint32_t) stcb->asoc.streamoutcnt, NULL, SCTP_SO_NOT_LOCKED);
3630                                 } else {
3631                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_ADD_FAIL, stcb,
3632                                             (uint32_t) stcb->asoc.streamoutcnt, NULL, SCTP_SO_NOT_LOCKED);
3633                                 }
3634                         } else if (type == SCTP_STR_RESET_TSN_REQUEST) {
3635                                 /**
3636                                  * a) Adopt the new in tsn.
3637                                  * b) reset the map
3638                                  * c) Adopt the new out-tsn
3639                                  */
3640                                 struct sctp_stream_reset_response_tsn *resp;
3641                                 struct sctp_forward_tsn_chunk fwdtsn;
3642                                 int abort_flag = 0;
3643
3644                                 if (respin == NULL) {
3645                                         /* huh ? */
3646                                         return (0);
3647                                 }
3648                                 if (action == SCTP_STREAM_RESET_PERFORMED) {
3649                                         resp = (struct sctp_stream_reset_response_tsn *)respin;
3650                                         asoc->stream_reset_outstanding--;
3651                                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3652                                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3653                                         fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1);
3654                                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3655                                         if (abort_flag) {
3656                                                 return (1);
3657                                         }
3658                                         stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1);
3659                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3660                                                 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3661                                         }
3662                                         stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map;
3663                                         stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn);
3664                                         memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size);
3665
3666                                         stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map;
3667                                         memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size);
3668
3669                                         stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn);
3670                                         stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn;
3671
3672                                         sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL);
3673                                         sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL);
3674
3675                                 }
3676                         }
3677                         /* get rid of the request and get the request flags */
3678                         if (asoc->stream_reset_outstanding == 0) {
3679                                 sctp_clean_up_stream_reset(stcb);
3680                         }
3681                 }
3682         }
3683         return (0);
3684 }
3685
3686 static void
3687 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb,
3688     struct sctp_tmit_chunk *chk,
3689     struct sctp_stream_reset_in_request *req, int trunc)
3690 {
3691         uint32_t seq;
3692         int len, i;
3693         int number_entries;
3694         uint16_t temp;
3695
3696         /*
3697          * peer wants me to send a str-reset to him for my outgoing seq's if
3698          * seq_in is right.
3699          */
3700         struct sctp_association *asoc = &stcb->asoc;
3701
3702         seq = ntohl(req->request_seq);
3703         if (asoc->str_reset_seq_in == seq) {
3704                 if (trunc) {
3705                         /* Can't do it, since they exceeded our buffer size  */
3706                         asoc->last_reset_action[1] = asoc->last_reset_action[0];
3707                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_DENIED;
3708                         sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3709                 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) {
3710                         len = ntohs(req->ph.param_length);
3711                         number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t));
3712                         for (i = 0; i < number_entries; i++) {
3713                                 temp = ntohs(req->list_of_streams[i]);
3714                                 req->list_of_streams[i] = temp;
3715                         }
3716                         /* move the reset action back one */
3717                         asoc->last_reset_action[1] = asoc->last_reset_action[0];
3718                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED;
3719                         sctp_add_stream_reset_out(chk, number_entries, req->list_of_streams,
3720                             asoc->str_reset_seq_out,
3721                             seq, (asoc->sending_seq - 1));
3722                         asoc->stream_reset_out_is_outstanding = 1;
3723                         asoc->str_reset = chk;
3724                         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
3725                         stcb->asoc.stream_reset_outstanding++;
3726                 } else {
3727                         /* Can't do it, since we have sent one out */
3728                         asoc->last_reset_action[1] = asoc->last_reset_action[0];
3729                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_TRY_LATER;
3730                         sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3731                 }
3732                 asoc->str_reset_seq_in++;
3733         } else if (asoc->str_reset_seq_in - 1 == seq) {
3734                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3735         } else if (asoc->str_reset_seq_in - 2 == seq) {
3736                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3737         } else {
3738                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO);
3739         }
3740 }
3741
3742 static int
3743 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb,
3744     struct sctp_tmit_chunk *chk,
3745     struct sctp_stream_reset_tsn_request *req)
3746 {
3747         /* reset all in and out and update the tsn */
3748         /*
3749          * A) reset my str-seq's on in and out. B) Select a receive next,
3750          * and set cum-ack to it. Also process this selected number as a
3751          * fwd-tsn as well. C) set in the response my next sending seq.
3752          */
3753         struct sctp_forward_tsn_chunk fwdtsn;
3754         struct sctp_association *asoc = &stcb->asoc;
3755         int abort_flag = 0;
3756         uint32_t seq;
3757
3758         seq = ntohl(req->request_seq);
3759         if (asoc->str_reset_seq_in == seq) {
3760                 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3761                 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3762                 fwdtsn.ch.chunk_flags = 0;
3763                 fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1);
3764                 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3765                 if (abort_flag) {
3766                         return (1);
3767                 }
3768                 stcb->asoc.highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA;
3769                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3770                         sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3771                 }
3772                 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map;
3773                 stcb->asoc.mapping_array_base_tsn = stcb->asoc.highest_tsn_inside_map + 1;
3774                 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size);
3775                 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map;
3776                 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size);
3777                 atomic_add_int(&stcb->asoc.sending_seq, 1);
3778                 /* save off historical data for retrans */
3779                 stcb->asoc.last_sending_seq[1] = stcb->asoc.last_sending_seq[0];
3780                 stcb->asoc.last_sending_seq[0] = stcb->asoc.sending_seq;
3781                 stcb->asoc.last_base_tsnsent[1] = stcb->asoc.last_base_tsnsent[0];
3782                 stcb->asoc.last_base_tsnsent[0] = stcb->asoc.mapping_array_base_tsn;
3783
3784                 sctp_add_stream_reset_result_tsn(chk,
3785                     ntohl(req->request_seq),
3786                     SCTP_STREAM_RESET_PERFORMED,
3787                     stcb->asoc.sending_seq,
3788                     stcb->asoc.mapping_array_base_tsn);
3789                 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL);
3790                 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL);
3791                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
3792                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED;
3793
3794                 asoc->str_reset_seq_in++;
3795         } else if (asoc->str_reset_seq_in - 1 == seq) {
3796                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3797                     stcb->asoc.last_sending_seq[0],
3798                     stcb->asoc.last_base_tsnsent[0]
3799                     );
3800         } else if (asoc->str_reset_seq_in - 2 == seq) {
3801                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1],
3802                     stcb->asoc.last_sending_seq[1],
3803                     stcb->asoc.last_base_tsnsent[1]
3804                     );
3805         } else {
3806                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO);
3807         }
3808         return (0);
3809 }
3810
3811 static void
3812 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb,
3813     struct sctp_tmit_chunk *chk,
3814     struct sctp_stream_reset_out_request *req, int trunc)
3815 {
3816         uint32_t seq, tsn;
3817         int number_entries, len;
3818         struct sctp_association *asoc = &stcb->asoc;
3819
3820         seq = ntohl(req->request_seq);
3821
3822         /* now if its not a duplicate we process it */
3823         if (asoc->str_reset_seq_in == seq) {
3824                 len = ntohs(req->ph.param_length);
3825                 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t));
3826                 /*
3827                  * the sender is resetting, handle the list issue.. we must
3828                  * a) verify if we can do the reset, if so no problem b) If
3829                  * we can't do the reset we must copy the request. c) queue
3830                  * it, and setup the data in processor to trigger it off
3831                  * when needed and dequeue all the queued data.
3832                  */
3833                 tsn = ntohl(req->send_reset_at_tsn);
3834
3835                 /* move the reset action back one */
3836                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3837                 if (trunc) {
3838                         sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_DENIED);
3839                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_DENIED;
3840                 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) {
3841                         /* we can do it now */
3842                         sctp_reset_in_stream(stcb, number_entries, req->list_of_streams);
3843                         sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_PERFORMED);
3844                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED;
3845                 } else {
3846                         /*
3847                          * we must queue it up and thus wait for the TSN's
3848                          * to arrive that are at or before tsn
3849                          */
3850                         struct sctp_stream_reset_list *liste;
3851                         int siz;
3852
3853                         siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t));
3854                         SCTP_MALLOC(liste, struct sctp_stream_reset_list *,
3855                             siz, SCTP_M_STRESET);
3856                         if (liste == NULL) {
3857                                 /* gak out of memory */
3858                                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_DENIED);
3859                                 asoc->last_reset_action[0] = SCTP_STREAM_RESET_DENIED;
3860                                 return;
3861                         }
3862                         liste->tsn = tsn;
3863                         liste->number_entries = number_entries;
3864                         memcpy(&liste->req, req,
3865                             (sizeof(struct sctp_stream_reset_out_request) + (number_entries * sizeof(uint16_t))));
3866                         TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp);
3867                         sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_PERFORMED);
3868                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED;
3869                 }
3870                 asoc->str_reset_seq_in++;
3871         } else if ((asoc->str_reset_seq_in - 1) == seq) {
3872                 /*
3873                  * one seq back, just echo back last action since my
3874                  * response was lost.
3875                  */
3876                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3877         } else if ((asoc->str_reset_seq_in - 2) == seq) {
3878                 /*
3879                  * two seq back, just echo back last action since my
3880                  * response was lost.
3881                  */
3882                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3883         } else {
3884                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO);
3885         }
3886 }
3887
3888 static void
3889 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
3890     struct sctp_stream_reset_add_strm *str_add)
3891 {
3892         /*
3893          * Peer is requesting to add more streams. If its within our
3894          * max-streams we will allow it.
3895          */
3896         uint16_t num_stream, i;
3897         uint32_t seq;
3898         struct sctp_association *asoc = &stcb->asoc;
3899         struct sctp_queued_to_read *ctl, *nctl;
3900
3901         /* Get the number. */
3902         seq = ntohl(str_add->request_seq);
3903         num_stream = ntohs(str_add->number_of_streams);
3904         /* Now what would be the new total? */
3905         if (asoc->str_reset_seq_in == seq) {
3906                 num_stream += stcb->asoc.streamincnt;
3907                 if (num_stream > stcb->asoc.max_inbound_streams) {
3908                         /* We must reject it they ask for to many */
3909         denied:
3910                         sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_DENIED);
3911                         stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
3912                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_DENIED;
3913                 } else {
3914                         /* Ok, we can do that :-) */
3915                         struct sctp_stream_in *oldstrm;
3916
3917                         /* save off the old */
3918                         oldstrm = stcb->asoc.strmin;
3919                         SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *,
3920                             (num_stream * sizeof(struct sctp_stream_in)),
3921                             SCTP_M_STRMI);
3922                         if (stcb->asoc.strmin == NULL) {
3923                                 stcb->asoc.strmin = oldstrm;
3924                                 goto denied;
3925                         }
3926                         /* copy off the old data */
3927                         for (i = 0; i < stcb->asoc.streamincnt; i++) {
3928                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
3929                                 stcb->asoc.strmin[i].stream_no = i;
3930                                 stcb->asoc.strmin[i].last_sequence_delivered = oldstrm[i].last_sequence_delivered;
3931                                 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started;
3932                                 /* now anything on those queues? */
3933                                 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next, nctl) {
3934                                         TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next);
3935                                         TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next);
3936                                 }
3937                         }
3938                         /* Init the new streams */
3939                         for (i = stcb->asoc.streamincnt; i < num_stream; i++) {
3940                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
3941                                 stcb->asoc.strmin[i].stream_no = i;
3942                                 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff;
3943                                 stcb->asoc.strmin[i].delivery_started = 0;
3944                         }
3945                         SCTP_FREE(oldstrm, SCTP_M_STRMI);
3946                         /* update the size */
3947                         stcb->asoc.streamincnt = num_stream;
3948                         /* Send the ack */
3949                         sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_PERFORMED);
3950                         stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
3951                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED;
3952                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_INSTREAM_ADD_OK, stcb,
3953                             (uint32_t) stcb->asoc.streamincnt, NULL, SCTP_SO_NOT_LOCKED);
3954                 }
3955         } else if ((asoc->str_reset_seq_in - 1) == seq) {
3956                 /*
3957                  * one seq back, just echo back last action since my
3958                  * response was lost.
3959                  */
3960                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3961         } else if ((asoc->str_reset_seq_in - 2) == seq) {
3962                 /*
3963                  * two seq back, just echo back last action since my
3964                  * response was lost.
3965                  */
3966                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3967         } else {
3968                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO);
3969
3970         }
3971 }
3972
3973 #ifdef __GNUC__
3974 __attribute__((noinline))
3975 #endif
3976         static int
3977             sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset,
3978         struct sctp_stream_reset_out_req *sr_req)
3979 {
3980         int chk_length, param_len, ptype;
3981         struct sctp_paramhdr pstore;
3982         uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE];
3983
3984         uint32_t seq;
3985         int num_req = 0;
3986         int trunc = 0;
3987         struct sctp_tmit_chunk *chk;
3988         struct sctp_chunkhdr *ch;
3989         struct sctp_paramhdr *ph;
3990         int ret_code = 0;
3991         int num_param = 0;
3992
3993         /* now it may be a reset or a reset-response */
3994         chk_length = ntohs(sr_req->ch.chunk_length);
3995
3996         /* setup for adding the response */
3997         sctp_alloc_a_chunk(stcb, chk);
3998         if (chk == NULL) {
3999                 return (ret_code);
4000         }
4001         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
4002         chk->rec.chunk_id.can_take_data = 0;
4003         chk->asoc = &stcb->asoc;
4004         chk->no_fr_allowed = 0;
4005         chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr);
4006         chk->book_size_scale = 0;
4007         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
4008         if (chk->data == NULL) {
4009 strres_nochunk:
4010                 if (chk->data) {
4011                         sctp_m_freem(chk->data);
4012                         chk->data = NULL;
4013                 }
4014                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
4015                 return (ret_code);
4016         }
4017         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
4018
4019         /* setup chunk parameters */
4020         chk->sent = SCTP_DATAGRAM_UNSENT;
4021         chk->snd_count = 0;
4022         chk->whoTo = NULL;
4023
4024         ch = mtod(chk->data, struct sctp_chunkhdr *);
4025         ch->chunk_type = SCTP_STREAM_RESET;
4026         ch->chunk_flags = 0;
4027         ch->chunk_length = htons(chk->send_size);
4028         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
4029         offset += sizeof(struct sctp_chunkhdr);
4030         while ((size_t)chk_length >= sizeof(struct sctp_stream_reset_tsn_request)) {
4031                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *) & pstore);
4032                 if (ph == NULL)
4033                         break;
4034                 param_len = ntohs(ph->param_length);
4035                 if (param_len < (int)sizeof(struct sctp_stream_reset_tsn_request)) {
4036                         /* bad param */
4037                         break;
4038                 }
4039                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, (int)sizeof(cstore)),
4040                     (uint8_t *) & cstore);
4041                 ptype = ntohs(ph->param_type);
4042                 num_param++;
4043                 if (param_len > (int)sizeof(cstore)) {
4044                         trunc = 1;
4045                 } else {
4046                         trunc = 0;
4047                 }
4048
4049                 if (num_param > SCTP_MAX_RESET_PARAMS) {
4050                         /* hit the max of parameters already sorry.. */
4051                         break;
4052                 }
4053                 if (ptype == SCTP_STR_RESET_OUT_REQUEST) {
4054                         struct sctp_stream_reset_out_request *req_out;
4055
4056                         req_out = (struct sctp_stream_reset_out_request *)ph;
4057                         num_req++;
4058                         if (stcb->asoc.stream_reset_outstanding) {
4059                                 seq = ntohl(req_out->response_seq);
4060                                 if (seq == stcb->asoc.str_reset_seq_out) {
4061                                         /* implicit ack */
4062                                         (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_PERFORMED, NULL);
4063                                 }
4064                         }
4065                         sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc);
4066                 } else if (ptype == SCTP_STR_RESET_ADD_STREAMS) {
4067                         struct sctp_stream_reset_add_strm *str_add;
4068
4069                         str_add = (struct sctp_stream_reset_add_strm *)ph;
4070                         num_req++;
4071                         sctp_handle_str_reset_add_strm(stcb, chk, str_add);
4072                 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) {
4073                         struct sctp_stream_reset_in_request *req_in;
4074
4075                         num_req++;
4076
4077                         req_in = (struct sctp_stream_reset_in_request *)ph;
4078
4079                         sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc);
4080                 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) {
4081                         struct sctp_stream_reset_tsn_request *req_tsn;
4082
4083                         num_req++;
4084                         req_tsn = (struct sctp_stream_reset_tsn_request *)ph;
4085
4086                         if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) {
4087                                 ret_code = 1;
4088                                 goto strres_nochunk;
4089                         }
4090                         /* no more */
4091                         break;
4092                 } else if (ptype == SCTP_STR_RESET_RESPONSE) {
4093                         struct sctp_stream_reset_response *resp;
4094                         uint32_t result;
4095
4096                         resp = (struct sctp_stream_reset_response *)ph;
4097                         seq = ntohl(resp->response_seq);
4098                         result = ntohl(resp->result);
4099                         if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) {
4100                                 ret_code = 1;
4101                                 goto strres_nochunk;
4102                         }
4103                 } else {
4104                         break;
4105                 }
4106                 offset += SCTP_SIZE32(param_len);
4107                 chk_length -= SCTP_SIZE32(param_len);
4108         }
4109         if (num_req == 0) {
4110                 /* we have no response free the stuff */
4111                 goto strres_nochunk;
4112         }
4113         /* ok we have a chunk to link in */
4114         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue,
4115             chk,
4116             sctp_next);
4117         stcb->asoc.ctrl_queue_cnt++;
4118         return (ret_code);
4119 }
4120
4121 /*
4122  * Handle a router or endpoints report of a packet loss, there are two ways
4123  * to handle this, either we get the whole packet and must disect it
4124  * ourselves (possibly with truncation and or corruption) or it is a summary
4125  * from a middle box that did the disectting for us.
4126  */
4127 static void
4128 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp,
4129     struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit)
4130 {
4131         uint32_t bottle_bw, on_queue;
4132         uint16_t trunc_len;
4133         unsigned int chlen;
4134         unsigned int at;
4135         struct sctp_chunk_desc desc;
4136         struct sctp_chunkhdr *ch;
4137
4138         chlen = ntohs(cp->ch.chunk_length);
4139         chlen -= sizeof(struct sctp_pktdrop_chunk);
4140         /* XXX possible chlen underflow */
4141         if (chlen == 0) {
4142                 ch = NULL;
4143                 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)
4144                         SCTP_STAT_INCR(sctps_pdrpbwrpt);
4145         } else {
4146                 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr));
4147                 chlen -= sizeof(struct sctphdr);
4148                 /* XXX possible chlen underflow */
4149                 memset(&desc, 0, sizeof(desc));
4150         }
4151         trunc_len = (uint16_t) ntohs(cp->trunc_len);
4152         if (trunc_len > limit) {
4153                 trunc_len = limit;
4154         }
4155         /* now the chunks themselves */
4156         while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) {
4157                 desc.chunk_type = ch->chunk_type;
4158                 /* get amount we need to move */
4159                 at = ntohs(ch->chunk_length);
4160                 if (at < sizeof(struct sctp_chunkhdr)) {
4161                         /* corrupt chunk, maybe at the end? */
4162                         SCTP_STAT_INCR(sctps_pdrpcrupt);
4163                         break;
4164                 }
4165                 if (trunc_len == 0) {
4166                         /* we are supposed to have all of it */
4167                         if (at > chlen) {
4168                                 /* corrupt skip it */
4169                                 SCTP_STAT_INCR(sctps_pdrpcrupt);
4170                                 break;
4171                         }
4172                 } else {
4173                         /* is there enough of it left ? */
4174                         if (desc.chunk_type == SCTP_DATA) {
4175                                 if (chlen < (sizeof(struct sctp_data_chunk) +
4176                                     sizeof(desc.data_bytes))) {
4177                                         break;
4178                                 }
4179                         } else {
4180                                 if (chlen < sizeof(struct sctp_chunkhdr)) {
4181                                         break;
4182                                 }
4183                         }
4184                 }
4185                 if (desc.chunk_type == SCTP_DATA) {
4186                         /* can we get out the tsn? */
4187                         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
4188                                 SCTP_STAT_INCR(sctps_pdrpmbda);
4189
4190                         if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) {
4191                                 /* yep */
4192                                 struct sctp_data_chunk *dcp;
4193                                 uint8_t *ddp;
4194                                 unsigned int iii;
4195
4196                                 dcp = (struct sctp_data_chunk *)ch;
4197                                 ddp = (uint8_t *) (dcp + 1);
4198                                 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) {
4199                                         desc.data_bytes[iii] = ddp[iii];
4200                                 }
4201                                 desc.tsn_ifany = dcp->dp.tsn;
4202                         } else {
4203                                 /* nope we are done. */
4204                                 SCTP_STAT_INCR(sctps_pdrpnedat);
4205                                 break;
4206                         }
4207                 } else {
4208                         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
4209                                 SCTP_STAT_INCR(sctps_pdrpmbct);
4210                 }
4211
4212                 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) {
4213                         SCTP_STAT_INCR(sctps_pdrppdbrk);
4214                         break;
4215                 }
4216                 if (SCTP_SIZE32(at) > chlen) {
4217                         break;
4218                 }
4219                 chlen -= SCTP_SIZE32(at);
4220                 if (chlen < sizeof(struct sctp_chunkhdr)) {
4221                         /* done, none left */
4222                         break;
4223                 }
4224                 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at));
4225         }
4226         /* Now update any rwnd --- possibly */
4227         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) {
4228                 /* From a peer, we get a rwnd report */
4229                 uint32_t a_rwnd;
4230
4231                 SCTP_STAT_INCR(sctps_pdrpfehos);
4232
4233                 bottle_bw = ntohl(cp->bottle_bw);
4234                 on_queue = ntohl(cp->current_onq);
4235                 if (bottle_bw && on_queue) {
4236                         /* a rwnd report is in here */
4237                         if (bottle_bw > on_queue)
4238                                 a_rwnd = bottle_bw - on_queue;
4239                         else
4240                                 a_rwnd = 0;
4241
4242                         if (a_rwnd == 0)
4243                                 stcb->asoc.peers_rwnd = 0;
4244                         else {
4245                                 if (a_rwnd > stcb->asoc.total_flight) {
4246                                         stcb->asoc.peers_rwnd =
4247                                             a_rwnd - stcb->asoc.total_flight;
4248                                 } else {
4249                                         stcb->asoc.peers_rwnd = 0;
4250                                 }
4251                                 if (stcb->asoc.peers_rwnd <
4252                                     stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
4253                                         /* SWS sender side engages */
4254                                         stcb->asoc.peers_rwnd = 0;
4255                                 }
4256                         }
4257                 }
4258         } else {
4259                 SCTP_STAT_INCR(sctps_pdrpfmbox);
4260         }
4261
4262         /* now middle boxes in sat networks get a cwnd bump */
4263         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) &&
4264             (stcb->asoc.sat_t3_loss_recovery == 0) &&
4265             (stcb->asoc.sat_network)) {
4266                 /*
4267                  * This is debateable but for sat networks it makes sense
4268                  * Note if a T3 timer has went off, we will prohibit any
4269                  * changes to cwnd until we exit the t3 loss recovery.
4270                  */
4271                 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb,
4272                     net, cp, &bottle_bw, &on_queue);
4273         }
4274 }
4275
4276 /*
4277  * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to
4278  * still contain IP/SCTP header - stcb: is the tcb found for this packet -
4279  * offset: offset into the mbuf chain to first chunkhdr - length: is the
4280  * length of the complete packet outputs: - length: modified to remaining
4281  * length after control processing - netp: modified to new sctp_nets after
4282  * cookie-echo processing - return NULL to discard the packet (ie. no asoc,
4283  * bad packet,...) otherwise return the tcb for this packet
4284  */
4285 #ifdef __GNUC__
4286 __attribute__((noinline))
4287 #endif
4288         static struct sctp_tcb *
4289                  sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length,
4290              struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp,
4291              struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen,
4292              uint32_t vrf_id, uint16_t port)
4293 {
4294         struct sctp_association *asoc;
4295         uint32_t vtag_in;
4296         int num_chunks = 0;     /* number of control chunks processed */
4297         uint32_t chk_length;
4298         int ret;
4299         int abort_no_unlock = 0;
4300         int ecne_seen = 0;
4301
4302         /*
4303          * How big should this be, and should it be alloc'd? Lets try the
4304          * d-mtu-ceiling for now (2k) and that should hopefully work ...
4305          * until we get into jumbo grams and such..
4306          */
4307         uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE];
4308         struct sctp_tcb *locked_tcb = stcb;
4309         int got_auth = 0;
4310         uint32_t auth_offset = 0, auth_len = 0;
4311         int auth_skipped = 0;
4312         int asconf_cnt = 0;
4313
4314 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4315         struct socket *so;
4316
4317 #endif
4318
4319         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n",
4320             iphlen, *offset, length, stcb);
4321
4322         /* validate chunk header length... */
4323         if (ntohs(ch->chunk_length) < sizeof(*ch)) {
4324                 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n",
4325                     ntohs(ch->chunk_length));
4326                 if (locked_tcb) {
4327                         SCTP_TCB_UNLOCK(locked_tcb);
4328                 }
4329                 return (NULL);
4330         }
4331         /*
4332          * validate the verification tag
4333          */
4334         vtag_in = ntohl(sh->v_tag);
4335
4336         if (locked_tcb) {
4337                 SCTP_TCB_LOCK_ASSERT(locked_tcb);
4338         }
4339         if (ch->chunk_type == SCTP_INITIATION) {
4340                 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n",
4341                     ntohs(ch->chunk_length), vtag_in);
4342                 if (vtag_in != 0) {
4343                         /* protocol error- silently discard... */
4344                         SCTP_STAT_INCR(sctps_badvtag);
4345                         if (locked_tcb) {
4346                                 SCTP_TCB_UNLOCK(locked_tcb);
4347                         }
4348                         return (NULL);
4349                 }
4350         } else if (ch->chunk_type != SCTP_COOKIE_ECHO) {
4351                 /*
4352                  * If there is no stcb, skip the AUTH chunk and process
4353                  * later after a stcb is found (to validate the lookup was
4354                  * valid.
4355                  */
4356                 if ((ch->chunk_type == SCTP_AUTHENTICATION) &&
4357                     (stcb == NULL) &&
4358                     !SCTP_BASE_SYSCTL(sctp_auth_disable)) {
4359                         /* save this chunk for later processing */
4360                         auth_skipped = 1;
4361                         auth_offset = *offset;
4362                         auth_len = ntohs(ch->chunk_length);
4363
4364                         /* (temporarily) move past this chunk */
4365                         *offset += SCTP_SIZE32(auth_len);
4366                         if (*offset >= length) {
4367                                 /* no more data left in the mbuf chain */
4368                                 *offset = length;
4369                                 if (locked_tcb) {
4370                                         SCTP_TCB_UNLOCK(locked_tcb);
4371                                 }
4372                                 return (NULL);
4373                         }
4374                         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4375                             sizeof(struct sctp_chunkhdr), chunk_buf);
4376                 }
4377                 if (ch == NULL) {
4378                         /* Help */
4379                         *offset = length;
4380                         if (locked_tcb) {
4381                                 SCTP_TCB_UNLOCK(locked_tcb);
4382                         }
4383                         return (NULL);
4384                 }
4385                 if (ch->chunk_type == SCTP_COOKIE_ECHO) {
4386                         goto process_control_chunks;
4387                 }
4388                 /*
4389                  * first check if it's an ASCONF with an unknown src addr we
4390                  * need to look inside to find the association
4391                  */
4392                 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) {
4393                         struct sctp_chunkhdr *asconf_ch = ch;
4394                         uint32_t asconf_offset = 0, asconf_len = 0;
4395
4396                         /* inp's refcount may be reduced */
4397                         SCTP_INP_INCR_REF(inp);
4398
4399                         asconf_offset = *offset;
4400                         do {
4401                                 asconf_len = ntohs(asconf_ch->chunk_length);
4402                                 if (asconf_len < sizeof(struct sctp_asconf_paramhdr))
4403                                         break;
4404                                 stcb = sctp_findassociation_ep_asconf(m, iphlen,
4405                                     *offset, sh, &inp, netp, vrf_id);
4406                                 if (stcb != NULL)
4407                                         break;
4408                                 asconf_offset += SCTP_SIZE32(asconf_len);
4409                                 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset,
4410                                     sizeof(struct sctp_chunkhdr), chunk_buf);
4411                         } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF);
4412                         if (stcb == NULL) {
4413                                 /*
4414                                  * reduce inp's refcount if not reduced in
4415                                  * sctp_findassociation_ep_asconf().
4416                                  */
4417                                 SCTP_INP_DECR_REF(inp);
4418                         } else {
4419                                 locked_tcb = stcb;
4420                         }
4421
4422                         /* now go back and verify any auth chunk to be sure */
4423                         if (auth_skipped && (stcb != NULL)) {
4424                                 struct sctp_auth_chunk *auth;
4425
4426                                 auth = (struct sctp_auth_chunk *)
4427                                     sctp_m_getptr(m, auth_offset,
4428                                     auth_len, chunk_buf);
4429                                 got_auth = 1;
4430                                 auth_skipped = 0;
4431                                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m,
4432                                     auth_offset)) {
4433                                         /* auth HMAC failed so dump it */
4434                                         *offset = length;
4435                                         if (locked_tcb) {
4436                                                 SCTP_TCB_UNLOCK(locked_tcb);
4437                                         }
4438                                         return (NULL);
4439                                 } else {
4440                                         /* remaining chunks are HMAC checked */
4441                                         stcb->asoc.authenticated = 1;
4442                                 }
4443                         }
4444                 }
4445                 if (stcb == NULL) {
4446                         /* no association, so it's out of the blue... */
4447                         sctp_handle_ootb(m, iphlen, *offset, sh, inp, NULL,
4448                             vrf_id, port);
4449                         *offset = length;
4450                         if (locked_tcb) {
4451                                 SCTP_TCB_UNLOCK(locked_tcb);
4452                         }
4453                         return (NULL);
4454                 }
4455                 asoc = &stcb->asoc;
4456                 /* ABORT and SHUTDOWN can use either v_tag... */
4457                 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) ||
4458                     (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) ||
4459                     (ch->chunk_type == SCTP_PACKET_DROPPED)) {
4460                         if ((vtag_in == asoc->my_vtag) ||
4461                             ((ch->chunk_flags & SCTP_HAD_NO_TCB) &&
4462                             (vtag_in == asoc->peer_vtag))) {
4463                                 /* this is valid */
4464                         } else {
4465                                 /* drop this packet... */
4466                                 SCTP_STAT_INCR(sctps_badvtag);
4467                                 if (locked_tcb) {
4468                                         SCTP_TCB_UNLOCK(locked_tcb);
4469                                 }
4470                                 return (NULL);
4471                         }
4472                 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
4473                         if (vtag_in != asoc->my_vtag) {
4474                                 /*
4475                                  * this could be a stale SHUTDOWN-ACK or the
4476                                  * peer never got the SHUTDOWN-COMPLETE and
4477                                  * is still hung; we have started a new asoc
4478                                  * but it won't complete until the shutdown
4479                                  * is completed
4480                                  */
4481                                 if (locked_tcb) {
4482                                         SCTP_TCB_UNLOCK(locked_tcb);
4483                                 }
4484                                 sctp_handle_ootb(m, iphlen, *offset, sh, inp,
4485                                     NULL, vrf_id, port);
4486                                 return (NULL);
4487                         }
4488                 } else {
4489                         /* for all other chunks, vtag must match */
4490                         if (vtag_in != asoc->my_vtag) {
4491                                 /* invalid vtag... */
4492                                 SCTPDBG(SCTP_DEBUG_INPUT3,
4493                                     "invalid vtag: %xh, expect %xh\n",
4494                                     vtag_in, asoc->my_vtag);
4495                                 SCTP_STAT_INCR(sctps_badvtag);
4496                                 if (locked_tcb) {
4497                                         SCTP_TCB_UNLOCK(locked_tcb);
4498                                 }
4499                                 *offset = length;
4500                                 return (NULL);
4501                         }
4502                 }
4503         }                       /* end if !SCTP_COOKIE_ECHO */
4504         /*
4505          * process all control chunks...
4506          */
4507         if (((ch->chunk_type == SCTP_SELECTIVE_ACK) ||
4508         /* EY */
4509             (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) ||
4510             (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) &&
4511             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) {
4512                 /* implied cookie-ack.. we must have lost the ack */
4513                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
4514                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
4515                             stcb->asoc.overall_error_count,
4516                             0,
4517                             SCTP_FROM_SCTP_INPUT,
4518                             __LINE__);
4519                 }
4520                 stcb->asoc.overall_error_count = 0;
4521                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb,
4522                     *netp);
4523         }
4524 process_control_chunks:
4525         while (IS_SCTP_CONTROL(ch)) {
4526                 /* validate chunk length */
4527                 chk_length = ntohs(ch->chunk_length);
4528                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n",
4529                     ch->chunk_type, chk_length);
4530                 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length);
4531                 if (chk_length < sizeof(*ch) ||
4532                     (*offset + (int)chk_length) > length) {
4533                         *offset = length;
4534                         if (locked_tcb) {
4535                                 SCTP_TCB_UNLOCK(locked_tcb);
4536                         }
4537                         return (NULL);
4538                 }
4539                 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks);
4540                 /*
4541                  * INIT-ACK only gets the init ack "header" portion only
4542                  * because we don't have to process the peer's COOKIE. All
4543                  * others get a complete chunk.
4544                  */
4545                 if ((ch->chunk_type == SCTP_INITIATION_ACK) ||
4546                     (ch->chunk_type == SCTP_INITIATION)) {
4547                         /* get an init-ack chunk */
4548                         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4549                             sizeof(struct sctp_init_ack_chunk), chunk_buf);
4550                         if (ch == NULL) {
4551                                 *offset = length;
4552                                 if (locked_tcb) {
4553                                         SCTP_TCB_UNLOCK(locked_tcb);
4554                                 }
4555                                 return (NULL);
4556                         }
4557                 } else {
4558                         /* For cookies and all other chunks. */
4559                         if (chk_length > sizeof(chunk_buf)) {
4560                                 /*
4561                                  * use just the size of the chunk buffer so
4562                                  * the front part of our chunks fit in
4563                                  * contiguous space up to the chunk buffer
4564                                  * size (508 bytes). For chunks that need to
4565                                  * get more than that they must use the
4566                                  * sctp_m_getptr() function or other means
4567                                  * (e.g. know how to parse mbuf chains).
4568                                  * Cookies do this already.
4569                                  */
4570                                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4571                                     (sizeof(chunk_buf) - 4),
4572                                     chunk_buf);
4573                                 if (ch == NULL) {
4574                                         *offset = length;
4575                                         if (locked_tcb) {
4576                                                 SCTP_TCB_UNLOCK(locked_tcb);
4577                                         }
4578                                         return (NULL);
4579                                 }
4580                         } else {
4581                                 /* We can fit it all */
4582                                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4583                                     chk_length, chunk_buf);
4584                                 if (ch == NULL) {
4585                                         SCTP_PRINTF("sctp_process_control: Can't get the all data....\n");
4586                                         *offset = length;
4587                                         if (locked_tcb) {
4588                                                 SCTP_TCB_UNLOCK(locked_tcb);
4589                                         }
4590                                         return (NULL);
4591                                 }
4592                         }
4593                 }
4594                 num_chunks++;
4595                 /* Save off the last place we got a control from */
4596                 if (stcb != NULL) {
4597                         if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) {
4598                                 /*
4599                                  * allow last_control to be NULL if
4600                                  * ASCONF... ASCONF processing will find the
4601                                  * right net later
4602                                  */
4603                                 if ((netp != NULL) && (*netp != NULL))
4604                                         stcb->asoc.last_control_chunk_from = *netp;
4605                         }
4606                 }
4607 #ifdef SCTP_AUDITING_ENABLED
4608                 sctp_audit_log(0xB0, ch->chunk_type);
4609 #endif
4610
4611                 /* check to see if this chunk required auth, but isn't */
4612                 if ((stcb != NULL) &&
4613                     !SCTP_BASE_SYSCTL(sctp_auth_disable) &&
4614                     sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) &&
4615                     !stcb->asoc.authenticated) {
4616                         /* "silently" ignore */
4617                         SCTP_STAT_INCR(sctps_recvauthmissing);
4618                         goto next_chunk;
4619                 }
4620                 switch (ch->chunk_type) {
4621                 case SCTP_INITIATION:
4622                         /* must be first and only chunk */
4623                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n");
4624                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4625                                 /* We are not interested anymore? */
4626                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
4627                                         /*
4628                                          * collision case where we are
4629                                          * sending to them too
4630                                          */
4631                                         ;
4632                                 } else {
4633                                         if (locked_tcb) {
4634                                                 SCTP_TCB_UNLOCK(locked_tcb);
4635                                         }
4636                                         *offset = length;
4637                                         return (NULL);
4638                                 }
4639                         }
4640                         if ((chk_length > SCTP_LARGEST_INIT_ACCEPTED) ||
4641                             (num_chunks > 1) ||
4642                             (SCTP_BASE_SYSCTL(sctp_strict_init) && (length - *offset > (int)SCTP_SIZE32(chk_length)))) {
4643                                 *offset = length;
4644                                 if (locked_tcb) {
4645                                         SCTP_TCB_UNLOCK(locked_tcb);
4646                                 }
4647                                 return (NULL);
4648                         }
4649                         if ((stcb != NULL) &&
4650                             (SCTP_GET_STATE(&stcb->asoc) ==
4651                             SCTP_STATE_SHUTDOWN_ACK_SENT)) {
4652                                 sctp_send_shutdown_ack(stcb, NULL);
4653                                 *offset = length;
4654                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
4655                                 if (locked_tcb) {
4656                                         SCTP_TCB_UNLOCK(locked_tcb);
4657                                 }
4658                                 return (NULL);
4659                         }
4660                         if (netp) {
4661                                 sctp_handle_init(m, iphlen, *offset, sh,
4662                                     (struct sctp_init_chunk *)ch, inp,
4663                                     stcb, *netp, &abort_no_unlock, vrf_id, port);
4664                         }
4665                         if (abort_no_unlock)
4666                                 return (NULL);
4667
4668                         *offset = length;
4669                         if (locked_tcb) {
4670                                 SCTP_TCB_UNLOCK(locked_tcb);
4671                         }
4672                         return (NULL);
4673                         break;
4674                 case SCTP_PAD_CHUNK:
4675                         break;
4676                 case SCTP_INITIATION_ACK:
4677                         /* must be first and only chunk */
4678                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT-ACK\n");
4679                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4680                                 /* We are not interested anymore */
4681                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
4682                                         ;
4683                                 } else {
4684                                         if (locked_tcb != stcb) {
4685                                                 /* Very unlikely */
4686                                                 SCTP_TCB_UNLOCK(locked_tcb);
4687                                         }
4688                                         *offset = length;
4689                                         if (stcb) {
4690 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4691                                                 so = SCTP_INP_SO(inp);
4692                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4693                                                 SCTP_TCB_UNLOCK(stcb);
4694                                                 SCTP_SOCKET_LOCK(so, 1);
4695                                                 SCTP_TCB_LOCK(stcb);
4696                                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4697 #endif
4698                                                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27);
4699 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4700                                                 SCTP_SOCKET_UNLOCK(so, 1);
4701 #endif
4702                                         }
4703                                         return (NULL);
4704                                 }
4705                         }
4706                         if ((num_chunks > 1) ||
4707                             (SCTP_BASE_SYSCTL(sctp_strict_init) && (length - *offset > (int)SCTP_SIZE32(chk_length)))) {
4708                                 *offset = length;
4709                                 if (locked_tcb) {
4710                                         SCTP_TCB_UNLOCK(locked_tcb);
4711                                 }
4712                                 return (NULL);
4713                         }
4714                         if ((netp) && (*netp)) {
4715                                 ret = sctp_handle_init_ack(m, iphlen, *offset, sh,
4716                                     (struct sctp_init_ack_chunk *)ch, stcb, *netp, &abort_no_unlock, vrf_id);
4717                         } else {
4718                                 ret = -1;
4719                         }
4720                         /*
4721                          * Special case, I must call the output routine to
4722                          * get the cookie echoed
4723                          */
4724                         if (abort_no_unlock)
4725                                 return (NULL);
4726
4727                         if ((stcb) && ret == 0)
4728                                 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
4729                         *offset = length;
4730                         if (locked_tcb) {
4731                                 SCTP_TCB_UNLOCK(locked_tcb);
4732                         }
4733                         return (NULL);
4734                         break;
4735                 case SCTP_SELECTIVE_ACK:
4736                         {
4737                                 struct sctp_sack_chunk *sack;
4738                                 int abort_now = 0;
4739                                 uint32_t a_rwnd, cum_ack;
4740                                 uint16_t num_seg, num_dup;
4741                                 uint8_t flags;
4742                                 int offset_seg, offset_dup;
4743
4744                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK\n");
4745                                 SCTP_STAT_INCR(sctps_recvsacks);
4746                                 if (stcb == NULL) {
4747                                         SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing SACK chunk\n");
4748                                         break;
4749                                 }
4750                                 if (chk_length < sizeof(struct sctp_sack_chunk)) {
4751                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n");
4752                                         break;
4753                                 }
4754                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
4755                                         /*-
4756                                          * If we have sent a shutdown-ack, we will pay no
4757                                          * attention to a sack sent in to us since
4758                                          * we don't care anymore.
4759                                          */
4760                                         break;
4761                                 }
4762                                 sack = (struct sctp_sack_chunk *)ch;
4763                                 flags = ch->chunk_flags;
4764                                 cum_ack = ntohl(sack->sack.cum_tsn_ack);
4765                                 num_seg = ntohs(sack->sack.num_gap_ack_blks);
4766                                 num_dup = ntohs(sack->sack.num_dup_tsns);
4767                                 a_rwnd = (uint32_t) ntohl(sack->sack.a_rwnd);
4768                                 if (sizeof(struct sctp_sack_chunk) +
4769                                     num_seg * sizeof(struct sctp_gap_ack_block) +
4770                                     num_dup * sizeof(uint32_t) != chk_length) {
4771                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n");
4772                                         break;
4773                                 }
4774                                 offset_seg = *offset + sizeof(struct sctp_sack_chunk);
4775                                 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
4776                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n",
4777                                     cum_ack, num_seg, a_rwnd);
4778                                 stcb->asoc.seen_a_sack_this_pkt = 1;
4779                                 if ((stcb->asoc.pr_sctp_cnt == 0) &&
4780                                     (num_seg == 0) &&
4781                                     SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
4782                                     (stcb->asoc.saw_sack_with_frags == 0) &&
4783                                     (stcb->asoc.saw_sack_with_nr_frags == 0) &&
4784                                     (!TAILQ_EMPTY(&stcb->asoc.sent_queue))
4785                                     ) {
4786                                         /*
4787                                          * We have a SIMPLE sack having no
4788                                          * prior segments and data on sent
4789                                          * queue to be acked.. Use the
4790                                          * faster path sack processing. We
4791                                          * also allow window update sacks
4792                                          * with no missing segments to go
4793                                          * this way too.
4794                                          */
4795                                         sctp_express_handle_sack(stcb, cum_ack, a_rwnd, &abort_now, ecne_seen);
4796                                 } else {
4797                                         if (netp && *netp)
4798                                                 sctp_handle_sack(m, offset_seg, offset_dup,
4799                                                     stcb, *netp,
4800                                                     num_seg, 0, num_dup, &abort_now, flags,
4801                                                     cum_ack, a_rwnd, ecne_seen);
4802                                 }
4803                                 if (abort_now) {
4804                                         /* ABORT signal from sack processing */
4805                                         *offset = length;
4806                                         return (NULL);
4807                                 }
4808                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
4809                                     TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
4810                                     (stcb->asoc.stream_queue_cnt == 0)) {
4811                                         sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
4812                                 }
4813                         }
4814                         break;
4815                         /*
4816                          * EY - nr_sack:  If the received chunk is an
4817                          * nr_sack chunk
4818                          */
4819                 case SCTP_NR_SELECTIVE_ACK:
4820                         {
4821                                 struct sctp_nr_sack_chunk *nr_sack;
4822                                 int abort_now = 0;
4823                                 uint32_t a_rwnd, cum_ack;
4824                                 uint16_t num_seg, num_nr_seg, num_dup;
4825                                 uint8_t flags;
4826                                 int offset_seg, offset_dup;
4827
4828                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK\n");
4829                                 SCTP_STAT_INCR(sctps_recvsacks);
4830                                 if (stcb == NULL) {
4831                                         SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing NR-SACK chunk\n");
4832                                         break;
4833                                 }
4834                                 if ((stcb->asoc.sctp_nr_sack_on_off == 0) ||
4835                                     (stcb->asoc.peer_supports_nr_sack == 0)) {
4836                                         goto unknown_chunk;
4837                                 }
4838                                 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) {
4839                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR-SACK chunk, too small\n");
4840                                         break;
4841                                 }
4842                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
4843                                         /*-
4844                                          * If we have sent a shutdown-ack, we will pay no
4845                                          * attention to a sack sent in to us since
4846                                          * we don't care anymore.
4847                                          */
4848                                         break;
4849                                 }
4850                                 nr_sack = (struct sctp_nr_sack_chunk *)ch;
4851                                 flags = ch->chunk_flags;
4852                                 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack);
4853                                 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks);
4854                                 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks);
4855                                 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns);
4856                                 a_rwnd = (uint32_t) ntohl(nr_sack->nr_sack.a_rwnd);
4857                                 if (sizeof(struct sctp_nr_sack_chunk) +
4858                                     (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) +
4859                                     num_dup * sizeof(uint32_t) != chk_length) {
4860                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n");
4861                                         break;
4862                                 }
4863                                 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk);
4864                                 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
4865                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n",
4866                                     cum_ack, num_seg, a_rwnd);
4867                                 stcb->asoc.seen_a_sack_this_pkt = 1;
4868                                 if ((stcb->asoc.pr_sctp_cnt == 0) &&
4869                                     (num_seg == 0) && (num_nr_seg == 0) &&
4870                                     SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
4871                                     (stcb->asoc.saw_sack_with_frags == 0) &&
4872                                     (stcb->asoc.saw_sack_with_nr_frags == 0) &&
4873                                     (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
4874                                         /*
4875                                          * We have a SIMPLE sack having no
4876                                          * prior segments and data on sent
4877                                          * queue to be acked. Use the faster
4878                                          * path sack processing. We also
4879                                          * allow window update sacks with no
4880                                          * missing segments to go this way
4881                                          * too.
4882                                          */
4883                                         sctp_express_handle_sack(stcb, cum_ack, a_rwnd,
4884                                             &abort_now, ecne_seen);
4885                                 } else {
4886                                         if (netp && *netp)
4887                                                 sctp_handle_sack(m, offset_seg, offset_dup,
4888                                                     stcb, *netp,
4889                                                     num_seg, num_nr_seg, num_dup, &abort_now, flags,
4890                                                     cum_ack, a_rwnd, ecne_seen);
4891                                 }
4892                                 if (abort_now) {
4893                                         /* ABORT signal from sack processing */
4894                                         *offset = length;
4895                                         return (NULL);
4896                                 }
4897                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
4898                                     TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
4899                                     (stcb->asoc.stream_queue_cnt == 0)) {
4900                                         sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
4901                                 }
4902                         }
4903                         break;
4904
4905                 case SCTP_HEARTBEAT_REQUEST:
4906                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n");
4907                         if ((stcb) && netp && *netp) {
4908                                 SCTP_STAT_INCR(sctps_recvheartbeat);
4909                                 sctp_send_heartbeat_ack(stcb, m, *offset,
4910                                     chk_length, *netp);
4911
4912                                 /* He's alive so give him credit */
4913                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
4914                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
4915                                             stcb->asoc.overall_error_count,
4916                                             0,
4917                                             SCTP_FROM_SCTP_INPUT,
4918                                             __LINE__);
4919                                 }
4920                                 stcb->asoc.overall_error_count = 0;
4921                         }
4922                         break;
4923                 case SCTP_HEARTBEAT_ACK:
4924                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT-ACK\n");
4925                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) {
4926                                 /* Its not ours */
4927                                 *offset = length;
4928                                 if (locked_tcb) {
4929                                         SCTP_TCB_UNLOCK(locked_tcb);
4930                                 }
4931                                 return (NULL);
4932                         }
4933                         /* He's alive so give him credit */
4934                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
4935                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
4936                                     stcb->asoc.overall_error_count,
4937                                     0,
4938                                     SCTP_FROM_SCTP_INPUT,
4939                                     __LINE__);
4940                         }
4941                         stcb->asoc.overall_error_count = 0;
4942                         SCTP_STAT_INCR(sctps_recvheartbeatack);
4943                         if (netp && *netp)
4944                                 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch,
4945                                     stcb, *netp);
4946                         break;
4947                 case SCTP_ABORT_ASSOCIATION:
4948                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n",
4949                             stcb);
4950                         if ((stcb) && netp && *netp)
4951                                 sctp_handle_abort((struct sctp_abort_chunk *)ch,
4952                                     stcb, *netp);
4953                         *offset = length;
4954                         return (NULL);
4955                         break;
4956                 case SCTP_SHUTDOWN:
4957                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n",
4958                             stcb);
4959                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) {
4960                                 *offset = length;
4961                                 if (locked_tcb) {
4962                                         SCTP_TCB_UNLOCK(locked_tcb);
4963                                 }
4964                                 return (NULL);
4965                         }
4966                         if (netp && *netp) {
4967                                 int abort_flag = 0;
4968
4969                                 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch,
4970                                     stcb, *netp, &abort_flag);
4971                                 if (abort_flag) {
4972                                         *offset = length;
4973                                         return (NULL);
4974                                 }
4975                         }
4976                         break;
4977                 case SCTP_SHUTDOWN_ACK:
4978                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-ACK, stcb %p\n", stcb);
4979                         if ((stcb) && (netp) && (*netp))
4980                                 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp);
4981                         *offset = length;
4982                         return (NULL);
4983                         break;
4984
4985                 case SCTP_OPERATION_ERROR:
4986                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP-ERR\n");
4987                         if ((stcb) && netp && *netp && sctp_handle_error(ch, stcb, *netp) < 0) {
4988
4989                                 *offset = length;
4990                                 return (NULL);
4991                         }
4992                         break;
4993                 case SCTP_COOKIE_ECHO:
4994                         SCTPDBG(SCTP_DEBUG_INPUT3,
4995                             "SCTP_COOKIE-ECHO, stcb %p\n", stcb);
4996                         if ((stcb) && (stcb->asoc.total_output_queue_size)) {
4997                                 ;
4998                         } else {
4999                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5000                                         /* We are not interested anymore */
5001                         abend:
5002                                         if (stcb) {
5003                                                 SCTP_TCB_UNLOCK(stcb);
5004                                         }
5005                                         *offset = length;
5006                                         return (NULL);
5007                                 }
5008                         }
5009                         /*
5010                          * First are we accepting? We do this again here
5011                          * since it is possible that a previous endpoint WAS
5012                          * listening responded to a INIT-ACK and then
5013                          * closed. We opened and bound.. and are now no
5014                          * longer listening.
5015                          */
5016
5017                         if ((stcb == NULL) && (inp->sctp_socket->so_qlen >= inp->sctp_socket->so_qlimit)) {
5018                                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
5019                                     (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) {
5020                                         struct mbuf *oper;
5021                                         struct sctp_paramhdr *phdr;
5022
5023                                         oper = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
5024                                             0, M_DONTWAIT, 1, MT_DATA);
5025                                         if (oper) {
5026                                                 SCTP_BUF_LEN(oper) =
5027                                                     sizeof(struct sctp_paramhdr);
5028                                                 phdr = mtod(oper,
5029                                                     struct sctp_paramhdr *);
5030                                                 phdr->param_type =
5031                                                     htons(SCTP_CAUSE_OUT_OF_RESC);
5032                                                 phdr->param_length =
5033                                                     htons(sizeof(struct sctp_paramhdr));
5034                                         }
5035                                         sctp_abort_association(inp, stcb, m,
5036                                             iphlen, sh, oper, vrf_id, port);
5037                                 }
5038                                 *offset = length;
5039                                 return (NULL);
5040                         } else {
5041                                 struct mbuf *ret_buf;
5042                                 struct sctp_inpcb *linp;
5043
5044                                 if (stcb) {
5045                                         linp = NULL;
5046                                 } else {
5047                                         linp = inp;
5048                                 }
5049
5050                                 if (linp) {
5051                                         SCTP_ASOC_CREATE_LOCK(linp);
5052                                         if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
5053                                             (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
5054                                                 SCTP_ASOC_CREATE_UNLOCK(linp);
5055                                                 goto abend;
5056                                         }
5057                                 }
5058                                 if (netp) {
5059                                         ret_buf =
5060                                             sctp_handle_cookie_echo(m, iphlen,
5061                                             *offset, sh,
5062                                             (struct sctp_cookie_echo_chunk *)ch,
5063                                             &inp, &stcb, netp,
5064                                             auth_skipped,
5065                                             auth_offset,
5066                                             auth_len,
5067                                             &locked_tcb,
5068                                             vrf_id,
5069                                             port);
5070                                 } else {
5071                                         ret_buf = NULL;
5072                                 }
5073                                 if (linp) {
5074                                         SCTP_ASOC_CREATE_UNLOCK(linp);
5075                                 }
5076                                 if (ret_buf == NULL) {
5077                                         if (locked_tcb) {
5078                                                 SCTP_TCB_UNLOCK(locked_tcb);
5079                                         }
5080                                         SCTPDBG(SCTP_DEBUG_INPUT3,
5081                                             "GAK, null buffer\n");
5082                                         auth_skipped = 0;
5083                                         *offset = length;
5084                                         return (NULL);
5085                                 }
5086                                 /* if AUTH skipped, see if it verified... */
5087                                 if (auth_skipped) {
5088                                         got_auth = 1;
5089                                         auth_skipped = 0;
5090                                 }
5091                                 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) {
5092                                         /*
5093                                          * Restart the timer if we have
5094                                          * pending data
5095                                          */
5096                                         struct sctp_tmit_chunk *chk;
5097
5098                                         chk = TAILQ_FIRST(&stcb->asoc.sent_queue);
5099                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
5100                                 }
5101                         }
5102                         break;
5103                 case SCTP_COOKIE_ACK:
5104                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE-ACK, stcb %p\n", stcb);
5105                         if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) {
5106                                 if (locked_tcb) {
5107                                         SCTP_TCB_UNLOCK(locked_tcb);
5108                                 }
5109                                 return (NULL);
5110                         }
5111                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5112                                 /* We are not interested anymore */
5113                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
5114                                         ;
5115                                 } else if (stcb) {
5116 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5117                                         so = SCTP_INP_SO(inp);
5118                                         atomic_add_int(&stcb->asoc.refcnt, 1);
5119                                         SCTP_TCB_UNLOCK(stcb);
5120                                         SCTP_SOCKET_LOCK(so, 1);
5121                                         SCTP_TCB_LOCK(stcb);
5122                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
5123 #endif
5124                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27);
5125 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5126                                         SCTP_SOCKET_UNLOCK(so, 1);
5127 #endif
5128                                         *offset = length;
5129                                         return (NULL);
5130                                 }
5131                         }
5132                         /* He's alive so give him credit */
5133                         if ((stcb) && netp && *netp) {
5134                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5135                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5136                                             stcb->asoc.overall_error_count,
5137                                             0,
5138                                             SCTP_FROM_SCTP_INPUT,
5139                                             __LINE__);
5140                                 }
5141                                 stcb->asoc.overall_error_count = 0;
5142                                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp);
5143                         }
5144                         break;
5145                 case SCTP_ECN_ECHO:
5146                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-ECHO\n");
5147                         /* He's alive so give him credit */
5148                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) {
5149                                 /* Its not ours */
5150                                 if (locked_tcb) {
5151                                         SCTP_TCB_UNLOCK(locked_tcb);
5152                                 }
5153                                 *offset = length;
5154                                 return (NULL);
5155                         }
5156                         if (stcb) {
5157                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5158                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5159                                             stcb->asoc.overall_error_count,
5160                                             0,
5161                                             SCTP_FROM_SCTP_INPUT,
5162                                             __LINE__);
5163                                 }
5164                                 stcb->asoc.overall_error_count = 0;
5165                                 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch,
5166                                     stcb);
5167                                 ecne_seen = 1;
5168                         }
5169                         break;
5170                 case SCTP_ECN_CWR:
5171                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-CWR\n");
5172                         /* He's alive so give him credit */
5173                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) {
5174                                 /* Its not ours */
5175                                 if (locked_tcb) {
5176                                         SCTP_TCB_UNLOCK(locked_tcb);
5177                                 }
5178                                 *offset = length;
5179                                 return (NULL);
5180                         }
5181                         if (stcb) {
5182                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5183                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5184                                             stcb->asoc.overall_error_count,
5185                                             0,
5186                                             SCTP_FROM_SCTP_INPUT,
5187                                             __LINE__);
5188                                 }
5189                                 stcb->asoc.overall_error_count = 0;
5190                                 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp);
5191                         }
5192                         break;
5193                 case SCTP_SHUTDOWN_COMPLETE:
5194                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-COMPLETE, stcb %p\n", stcb);
5195                         /* must be first and only chunk */
5196                         if ((num_chunks > 1) ||
5197                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
5198                                 *offset = length;
5199                                 if (locked_tcb) {
5200                                         SCTP_TCB_UNLOCK(locked_tcb);
5201                                 }
5202                                 return (NULL);
5203                         }
5204                         if ((stcb) && netp && *netp) {
5205                                 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch,
5206                                     stcb, *netp);
5207                         }
5208                         *offset = length;
5209                         return (NULL);
5210                         break;
5211                 case SCTP_ASCONF:
5212                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n");
5213                         /* He's alive so give him credit */
5214                         if (stcb) {
5215                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5216                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5217                                             stcb->asoc.overall_error_count,
5218                                             0,
5219                                             SCTP_FROM_SCTP_INPUT,
5220                                             __LINE__);
5221                                 }
5222                                 stcb->asoc.overall_error_count = 0;
5223                                 sctp_handle_asconf(m, *offset,
5224                                     (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0);
5225                                 asconf_cnt++;
5226                         }
5227                         break;
5228                 case SCTP_ASCONF_ACK:
5229                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF-ACK\n");
5230                         if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) {
5231                                 /* Its not ours */
5232                                 if (locked_tcb) {
5233                                         SCTP_TCB_UNLOCK(locked_tcb);
5234                                 }
5235                                 *offset = length;
5236                                 return (NULL);
5237                         }
5238                         if ((stcb) && netp && *netp) {
5239                                 /* He's alive so give him credit */
5240                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5241                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5242                                             stcb->asoc.overall_error_count,
5243                                             0,
5244                                             SCTP_FROM_SCTP_INPUT,
5245                                             __LINE__);
5246                                 }
5247                                 stcb->asoc.overall_error_count = 0;
5248                                 sctp_handle_asconf_ack(m, *offset,
5249                                     (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock);
5250                                 if (abort_no_unlock)
5251                                         return (NULL);
5252                         }
5253                         break;
5254                 case SCTP_FORWARD_CUM_TSN:
5255                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD-TSN\n");
5256                         if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) {
5257                                 /* Its not ours */
5258                                 if (locked_tcb) {
5259                                         SCTP_TCB_UNLOCK(locked_tcb);
5260                                 }
5261                                 *offset = length;
5262                                 return (NULL);
5263                         }
5264                         /* He's alive so give him credit */
5265                         if (stcb) {
5266                                 int abort_flag = 0;
5267
5268                                 stcb->asoc.overall_error_count = 0;
5269                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5270                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5271                                             stcb->asoc.overall_error_count,
5272                                             0,
5273                                             SCTP_FROM_SCTP_INPUT,
5274                                             __LINE__);
5275                                 }
5276                                 *fwd_tsn_seen = 1;
5277                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5278                                         /* We are not interested anymore */
5279 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5280                                         so = SCTP_INP_SO(inp);
5281                                         atomic_add_int(&stcb->asoc.refcnt, 1);
5282                                         SCTP_TCB_UNLOCK(stcb);
5283                                         SCTP_SOCKET_LOCK(so, 1);
5284                                         SCTP_TCB_LOCK(stcb);
5285                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
5286 #endif
5287                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_29);
5288 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5289                                         SCTP_SOCKET_UNLOCK(so, 1);
5290 #endif
5291                                         *offset = length;
5292                                         return (NULL);
5293                                 }
5294                                 sctp_handle_forward_tsn(stcb,
5295                                     (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset);
5296                                 if (abort_flag) {
5297                                         *offset = length;
5298                                         return (NULL);
5299                                 } else {
5300                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5301                                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5302                                                     stcb->asoc.overall_error_count,
5303                                                     0,
5304                                                     SCTP_FROM_SCTP_INPUT,
5305                                                     __LINE__);
5306                                         }
5307                                         stcb->asoc.overall_error_count = 0;
5308                                 }
5309
5310                         }
5311                         break;
5312                 case SCTP_STREAM_RESET:
5313                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n");
5314                         if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) {
5315                                 /* Its not ours */
5316                                 if (locked_tcb) {
5317                                         SCTP_TCB_UNLOCK(locked_tcb);
5318                                 }
5319                                 *offset = length;
5320                                 return (NULL);
5321                         }
5322                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5323                                 /* We are not interested anymore */
5324 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5325                                 so = SCTP_INP_SO(inp);
5326                                 atomic_add_int(&stcb->asoc.refcnt, 1);
5327                                 SCTP_TCB_UNLOCK(stcb);
5328                                 SCTP_SOCKET_LOCK(so, 1);
5329                                 SCTP_TCB_LOCK(stcb);
5330                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
5331 #endif
5332                                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_30);
5333 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5334                                 SCTP_SOCKET_UNLOCK(so, 1);
5335 #endif
5336                                 *offset = length;
5337                                 return (NULL);
5338                         }
5339                         if (stcb->asoc.peer_supports_strreset == 0) {
5340                                 /*
5341                                  * hmm, peer should have announced this, but
5342                                  * we will turn it on since he is sending us
5343                                  * a stream reset.
5344                                  */
5345                                 stcb->asoc.peer_supports_strreset = 1;
5346                         }
5347                         if (sctp_handle_stream_reset(stcb, m, *offset, (struct sctp_stream_reset_out_req *)ch)) {
5348                                 /* stop processing */
5349                                 *offset = length;
5350                                 return (NULL);
5351                         }
5352                         break;
5353                 case SCTP_PACKET_DROPPED:
5354                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n");
5355                         /* re-get it all please */
5356                         if (chk_length < sizeof(struct sctp_pktdrop_chunk)) {
5357                                 /* Its not ours */
5358                                 if (locked_tcb) {
5359                                         SCTP_TCB_UNLOCK(locked_tcb);
5360                                 }
5361                                 *offset = length;
5362                                 return (NULL);
5363                         }
5364                         if (ch && (stcb) && netp && (*netp)) {
5365                                 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch,
5366                                     stcb, *netp,
5367                                     min(chk_length, (sizeof(chunk_buf) - 4)));
5368
5369                         }
5370                         break;
5371
5372                 case SCTP_AUTHENTICATION:
5373                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n");
5374                         if (SCTP_BASE_SYSCTL(sctp_auth_disable))
5375                                 goto unknown_chunk;
5376
5377                         if (stcb == NULL) {
5378                                 /* save the first AUTH for later processing */
5379                                 if (auth_skipped == 0) {
5380                                         auth_offset = *offset;
5381                                         auth_len = chk_length;
5382                                         auth_skipped = 1;
5383                                 }
5384                                 /* skip this chunk (temporarily) */
5385                                 goto next_chunk;
5386                         }
5387                         if ((chk_length < (sizeof(struct sctp_auth_chunk))) ||
5388                             (chk_length > (sizeof(struct sctp_auth_chunk) +
5389                             SCTP_AUTH_DIGEST_LEN_MAX))) {
5390                                 /* Its not ours */
5391                                 if (locked_tcb) {
5392                                         SCTP_TCB_UNLOCK(locked_tcb);
5393                                 }
5394                                 *offset = length;
5395                                 return (NULL);
5396                         }
5397                         if (got_auth == 1) {
5398                                 /* skip this chunk... it's already auth'd */
5399                                 goto next_chunk;
5400                         }
5401                         got_auth = 1;
5402                         if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch,
5403                             m, *offset)) {
5404                                 /* auth HMAC failed so dump the packet */
5405                                 *offset = length;
5406                                 return (stcb);
5407                         } else {
5408                                 /* remaining chunks are HMAC checked */
5409                                 stcb->asoc.authenticated = 1;
5410                         }
5411                         break;
5412
5413                 default:
5414         unknown_chunk:
5415                         /* it's an unknown chunk! */
5416                         if ((ch->chunk_type & 0x40) && (stcb != NULL)) {
5417                                 struct mbuf *mm;
5418                                 struct sctp_paramhdr *phd;
5419
5420                                 mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
5421                                     0, M_DONTWAIT, 1, MT_DATA);
5422                                 if (mm) {
5423                                         phd = mtod(mm, struct sctp_paramhdr *);
5424                                         /*
5425                                          * We cheat and use param type since
5426                                          * we did not bother to define a
5427                                          * error cause struct. They are the
5428                                          * same basic format with different
5429                                          * names.
5430                                          */
5431                                         phd->param_type = htons(SCTP_CAUSE_UNRECOG_CHUNK);
5432                                         phd->param_length = htons(chk_length + sizeof(*phd));
5433                                         SCTP_BUF_LEN(mm) = sizeof(*phd);
5434                                         SCTP_BUF_NEXT(mm) = SCTP_M_COPYM(m, *offset, SCTP_SIZE32(chk_length),
5435                                             M_DONTWAIT);
5436                                         if (SCTP_BUF_NEXT(mm)) {
5437 #ifdef SCTP_MBUF_LOGGING
5438                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5439                                                         struct mbuf *mat;
5440
5441                                                         mat = SCTP_BUF_NEXT(mm);
5442                                                         while (mat) {
5443                                                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
5444                                                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
5445                                                                 }
5446                                                                 mat = SCTP_BUF_NEXT(mat);
5447                                                         }
5448                                                 }
5449 #endif
5450                                                 sctp_queue_op_err(stcb, mm);
5451                                         } else {
5452                                                 sctp_m_freem(mm);
5453                                         }
5454                                 }
5455                         }
5456                         if ((ch->chunk_type & 0x80) == 0) {
5457                                 /* discard this packet */
5458                                 *offset = length;
5459                                 return (stcb);
5460                         }       /* else skip this bad chunk and continue... */
5461                         break;
5462                 }               /* switch (ch->chunk_type) */
5463
5464
5465 next_chunk:
5466                 /* get the next chunk */
5467                 *offset += SCTP_SIZE32(chk_length);
5468                 if (*offset >= length) {
5469                         /* no more data left in the mbuf chain */
5470                         break;
5471                 }
5472                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
5473                     sizeof(struct sctp_chunkhdr), chunk_buf);
5474                 if (ch == NULL) {
5475                         if (locked_tcb) {
5476                                 SCTP_TCB_UNLOCK(locked_tcb);
5477                         }
5478                         *offset = length;
5479                         return (NULL);
5480                 }
5481         }                       /* while */
5482
5483         if (asconf_cnt > 0 && stcb != NULL) {
5484                 sctp_send_asconf_ack(stcb);
5485         }
5486         return (stcb);
5487 }
5488
5489
5490 #ifdef INVARIANTS
5491 #ifdef __GNUC__
5492 __attribute__((noinline))
5493 #endif
5494         void
5495              sctp_validate_no_locks(struct sctp_inpcb *inp)
5496 {
5497         struct sctp_tcb *lstcb;
5498
5499         LIST_FOREACH(lstcb, &inp->sctp_asoc_list, sctp_tcblist) {
5500                 if (mtx_owned(&lstcb->tcb_mtx)) {
5501                         panic("Own lock on stcb at return from input");
5502                 }
5503         }
5504         if (mtx_owned(&inp->inp_create_mtx)) {
5505                 panic("Own create lock on inp");
5506         }
5507         if (mtx_owned(&inp->inp_mtx)) {
5508                 panic("Own inp lock on inp");
5509         }
5510 }
5511
5512 #endif
5513
5514 /*
5515  * common input chunk processing (v4 and v6)
5516  */
5517 void
5518 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset,
5519     int length, struct sctphdr *sh, struct sctp_chunkhdr *ch,
5520     struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets *net,
5521     uint8_t ecn_bits, uint32_t vrf_id, uint16_t port)
5522 {
5523         /*
5524          * Control chunk processing
5525          */
5526         uint32_t high_tsn;
5527         int fwd_tsn_seen = 0, data_processed = 0;
5528         struct mbuf *m = *mm;
5529         int abort_flag = 0;
5530         int un_sent;
5531         int cnt_ctrl_ready = 0;
5532
5533         SCTP_STAT_INCR(sctps_recvdatagrams);
5534 #ifdef SCTP_AUDITING_ENABLED
5535         sctp_audit_log(0xE0, 1);
5536         sctp_auditing(0, inp, stcb, net);
5537 #endif
5538
5539         SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n",
5540             m, iphlen, offset, length, stcb);
5541         if (stcb) {
5542                 /* always clear this before beginning a packet */
5543                 stcb->asoc.authenticated = 0;
5544                 stcb->asoc.seen_a_sack_this_pkt = 0;
5545                 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n",
5546                     stcb, stcb->asoc.state);
5547
5548                 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) ||
5549                     (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) {
5550                         /*-
5551                          * If we hit here, we had a ref count
5552                          * up when the assoc was aborted and the
5553                          * timer is clearing out the assoc, we should
5554                          * NOT respond to any packet.. its OOTB.
5555                          */
5556                         SCTP_TCB_UNLOCK(stcb);
5557                         sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL,
5558                             vrf_id, port);
5559                         goto out_now;
5560                 }
5561         }
5562         if (IS_SCTP_CONTROL(ch)) {
5563                 /* process the control portion of the SCTP packet */
5564                 /* sa_ignore NO_NULL_CHK */
5565                 stcb = sctp_process_control(m, iphlen, &offset, length, sh, ch,
5566                     inp, stcb, &net, &fwd_tsn_seen, vrf_id, port);
5567                 if (stcb) {
5568                         /*
5569                          * This covers us if the cookie-echo was there and
5570                          * it changes our INP.
5571                          */
5572                         inp = stcb->sctp_ep;
5573                         if ((net) && (port)) {
5574                                 if (net->port == 0) {
5575                                         sctp_pathmtu_adjustment(inp, stcb, net, net->mtu - sizeof(struct udphdr));
5576                                 }
5577                                 net->port = port;
5578                         }
5579                 }
5580         } else {
5581                 /*
5582                  * no control chunks, so pre-process DATA chunks (these
5583                  * checks are taken care of by control processing)
5584                  */
5585
5586                 /*
5587                  * if DATA only packet, and auth is required, then punt...
5588                  * can't have authenticated without any AUTH (control)
5589                  * chunks
5590                  */
5591                 if ((stcb != NULL) &&
5592                     !SCTP_BASE_SYSCTL(sctp_auth_disable) &&
5593                     sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) {
5594                         /* "silently" ignore */
5595                         SCTP_STAT_INCR(sctps_recvauthmissing);
5596                         SCTP_TCB_UNLOCK(stcb);
5597                         goto out_now;
5598                 }
5599                 if (stcb == NULL) {
5600                         /* out of the blue DATA chunk */
5601                         sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL,
5602                             vrf_id, port);
5603                         goto out_now;
5604                 }
5605                 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) {
5606                         /* v_tag mismatch! */
5607                         SCTP_STAT_INCR(sctps_badvtag);
5608                         SCTP_TCB_UNLOCK(stcb);
5609                         goto out_now;
5610                 }
5611         }
5612
5613         if (stcb == NULL) {
5614                 /*
5615                  * no valid TCB for this packet, or we found it's a bad
5616                  * packet while processing control, or we're done with this
5617                  * packet (done or skip rest of data), so we drop it...
5618                  */
5619                 goto out_now;
5620         }
5621         /*
5622          * DATA chunk processing
5623          */
5624         /* plow through the data chunks while length > offset */
5625
5626         /*
5627          * Rest should be DATA only.  Check authentication state if AUTH for
5628          * DATA is required.
5629          */
5630         if ((length > offset) &&
5631             (stcb != NULL) &&
5632             !SCTP_BASE_SYSCTL(sctp_auth_disable) &&
5633             sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) &&
5634             !stcb->asoc.authenticated) {
5635                 /* "silently" ignore */
5636                 SCTP_STAT_INCR(sctps_recvauthmissing);
5637                 SCTPDBG(SCTP_DEBUG_AUTH1,
5638                     "Data chunk requires AUTH, skipped\n");
5639                 goto trigger_send;
5640         }
5641         if (length > offset) {
5642                 int retval;
5643
5644                 /*
5645                  * First check to make sure our state is correct. We would
5646                  * not get here unless we really did have a tag, so we don't
5647                  * abort if this happens, just dump the chunk silently.
5648                  */
5649                 switch (SCTP_GET_STATE(&stcb->asoc)) {
5650                 case SCTP_STATE_COOKIE_ECHOED:
5651                         /*
5652                          * we consider data with valid tags in this state
5653                          * shows us the cookie-ack was lost. Imply it was
5654                          * there.
5655                          */
5656                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5657                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5658                                     stcb->asoc.overall_error_count,
5659                                     0,
5660                                     SCTP_FROM_SCTP_INPUT,
5661                                     __LINE__);
5662                         }
5663                         stcb->asoc.overall_error_count = 0;
5664                         sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net);
5665                         break;
5666                 case SCTP_STATE_COOKIE_WAIT:
5667                         /*
5668                          * We consider OOTB any data sent during asoc setup.
5669                          */
5670                         sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL,
5671                             vrf_id, port);
5672                         SCTP_TCB_UNLOCK(stcb);
5673                         goto out_now;
5674                         /* sa_ignore NOTREACHED */
5675                         break;
5676                 case SCTP_STATE_EMPTY:  /* should not happen */
5677                 case SCTP_STATE_INUSE:  /* should not happen */
5678                 case SCTP_STATE_SHUTDOWN_RECEIVED:      /* This is a peer error */
5679                 case SCTP_STATE_SHUTDOWN_ACK_SENT:
5680                 default:
5681                         SCTP_TCB_UNLOCK(stcb);
5682                         goto out_now;
5683                         /* sa_ignore NOTREACHED */
5684                         break;
5685                 case SCTP_STATE_OPEN:
5686                 case SCTP_STATE_SHUTDOWN_SENT:
5687                         break;
5688                 }
5689                 /* plow through the data chunks while length > offset */
5690                 retval = sctp_process_data(mm, iphlen, &offset, length, sh,
5691                     inp, stcb, net, &high_tsn);
5692                 if (retval == 2) {
5693                         /*
5694                          * The association aborted, NO UNLOCK needed since
5695                          * the association is destroyed.
5696                          */
5697                         goto out_now;
5698                 }
5699                 data_processed = 1;
5700                 /*
5701                  * Anything important needs to have been m_copy'ed in
5702                  * process_data
5703                  */
5704         }
5705         /* take care of ecn */
5706         if ((stcb->asoc.ecn_allowed == 1) &&
5707             ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) {
5708                 /* Yep, we need to add a ECNE */
5709                 sctp_send_ecn_echo(stcb, net, high_tsn);
5710         }
5711         if ((data_processed == 0) && (fwd_tsn_seen)) {
5712                 int was_a_gap;
5713                 uint32_t highest_tsn;
5714
5715                 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) {
5716                         highest_tsn = stcb->asoc.highest_tsn_inside_nr_map;
5717                 } else {
5718                         highest_tsn = stcb->asoc.highest_tsn_inside_map;
5719                 }
5720                 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn);
5721                 stcb->asoc.send_sack = 1;
5722                 sctp_sack_check(stcb, was_a_gap, &abort_flag);
5723                 if (abort_flag) {
5724                         /* Again, we aborted so NO UNLOCK needed */
5725                         goto out_now;
5726                 }
5727         } else if (fwd_tsn_seen) {
5728                 stcb->asoc.send_sack = 1;
5729         }
5730         /* trigger send of any chunks in queue... */
5731 trigger_send:
5732 #ifdef SCTP_AUDITING_ENABLED
5733         sctp_audit_log(0xE0, 2);
5734         sctp_auditing(1, inp, stcb, net);
5735 #endif
5736         SCTPDBG(SCTP_DEBUG_INPUT1,
5737             "Check for chunk output prw:%d tqe:%d tf=%d\n",
5738             stcb->asoc.peers_rwnd,
5739             TAILQ_EMPTY(&stcb->asoc.control_send_queue),
5740             stcb->asoc.total_flight);
5741         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
5742         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
5743                 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq;
5744         }
5745         if (cnt_ctrl_ready ||
5746             ((un_sent) &&
5747             (stcb->asoc.peers_rwnd > 0 ||
5748             (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) {
5749                 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n");
5750                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
5751                 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n");
5752         }
5753 #ifdef SCTP_AUDITING_ENABLED
5754         sctp_audit_log(0xE0, 3);
5755         sctp_auditing(2, inp, stcb, net);
5756 #endif
5757         SCTP_TCB_UNLOCK(stcb);
5758 out_now:
5759 #ifdef INVARIANTS
5760         sctp_validate_no_locks(inp);
5761 #endif
5762         return;
5763 }
5764
5765 #if 0
5766 static void
5767 sctp_print_mbuf_chain(struct mbuf *m)
5768 {
5769         for (; m; m = SCTP_BUF_NEXT(m)) {
5770                 printf("%p: m_len = %ld\n", m, SCTP_BUF_LEN(m));
5771                 if (SCTP_BUF_IS_EXTENDED(m))
5772                         printf("%p: extend_size = %d\n", m, SCTP_BUF_EXTEND_SIZE(m));
5773         }
5774 }
5775
5776 #endif
5777
5778 #ifdef INET
5779 void
5780 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port)
5781 {
5782 #ifdef SCTP_MBUF_LOGGING
5783         struct mbuf *mat;
5784
5785 #endif
5786         struct mbuf *m;
5787         int iphlen;
5788         uint32_t vrf_id = 0;
5789         uint8_t ecn_bits;
5790         struct ip *ip;
5791         struct sctphdr *sh;
5792         struct sctp_inpcb *inp = NULL;
5793         struct sctp_nets *net;
5794         struct sctp_tcb *stcb = NULL;
5795         struct sctp_chunkhdr *ch;
5796         int refcount_up = 0;
5797         int length, mlen, offset;
5798
5799 #if !defined(SCTP_WITH_NO_CSUM)
5800         uint32_t check, calc_check;
5801
5802 #endif
5803
5804         if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) {
5805                 SCTP_RELEASE_PKT(i_pak);
5806                 return;
5807         }
5808         mlen = SCTP_HEADER_LEN(i_pak);
5809         iphlen = off;
5810         m = SCTP_HEADER_TO_CHAIN(i_pak);
5811
5812         net = NULL;
5813         SCTP_STAT_INCR(sctps_recvpackets);
5814         SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
5815
5816
5817 #ifdef SCTP_MBUF_LOGGING
5818         /* Log in any input mbufs */
5819         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5820                 mat = m;
5821                 while (mat) {
5822                         if (SCTP_BUF_IS_EXTENDED(mat)) {
5823                                 sctp_log_mb(mat, SCTP_MBUF_INPUT);
5824                         }
5825                         mat = SCTP_BUF_NEXT(mat);
5826                 }
5827         }
5828 #endif
5829 #ifdef  SCTP_PACKET_LOGGING
5830         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
5831                 sctp_packet_log(m, mlen);
5832 #endif
5833         /*
5834          * Must take out the iphlen, since mlen expects this (only effect lb
5835          * case)
5836          */
5837         mlen -= iphlen;
5838
5839         /*
5840          * Get IP, SCTP, and first chunk header together in first mbuf.
5841          */
5842         ip = mtod(m, struct ip *);
5843         offset = iphlen + sizeof(*sh) + sizeof(*ch);
5844         if (SCTP_BUF_LEN(m) < offset) {
5845                 if ((m = m_pullup(m, offset)) == 0) {
5846                         SCTP_STAT_INCR(sctps_hdrops);
5847                         return;
5848                 }
5849                 ip = mtod(m, struct ip *);
5850         }
5851         /* validate mbuf chain length with IP payload length */
5852         if (mlen < (SCTP_GET_IPV4_LENGTH(ip) - iphlen)) {
5853                 SCTP_STAT_INCR(sctps_hdrops);
5854                 goto bad;
5855         }
5856         sh = (struct sctphdr *)((caddr_t)ip + iphlen);
5857         ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(*sh));
5858         SCTPDBG(SCTP_DEBUG_INPUT1,
5859             "sctp_input() length:%d iphlen:%d\n", mlen, iphlen);
5860
5861         /* SCTP does not allow broadcasts or multicasts */
5862         if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
5863                 goto bad;
5864         }
5865         if (SCTP_IS_IT_BROADCAST(ip->ip_dst, m)) {
5866                 /*
5867                  * We only look at broadcast if its a front state, All
5868                  * others we will not have a tcb for anyway.
5869                  */
5870                 goto bad;
5871         }
5872         /* validate SCTP checksum */
5873         SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
5874             "sctp_input(): Packet of length %d received on %s with csum_flags 0x%x.\n",
5875             m->m_pkthdr.len,
5876             if_name(m->m_pkthdr.rcvif),
5877             m->m_pkthdr.csum_flags);
5878 #if defined(SCTP_WITH_NO_CSUM)
5879         SCTP_STAT_INCR(sctps_recvnocrc);
5880 #else
5881         if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
5882                 SCTP_STAT_INCR(sctps_recvhwcrc);
5883                 goto sctp_skip_csum_4;
5884         }
5885         check = sh->checksum;   /* save incoming checksum */
5886         sh->checksum = 0;       /* prepare for calc */
5887         calc_check = sctp_calculate_cksum(m, iphlen);
5888         sh->checksum = check;
5889         SCTP_STAT_INCR(sctps_recvswcrc);
5890         if (calc_check != check) {
5891                 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x  m:%p mlen:%d iphlen:%d\n",
5892                     calc_check, check, m, mlen, iphlen);
5893
5894                 stcb = sctp_findassociation_addr(m, iphlen,
5895                     offset - sizeof(*ch),
5896                     sh, ch, &inp, &net,
5897                     vrf_id);
5898                 if ((net) && (port)) {
5899                         if (net->port == 0) {
5900                                 sctp_pathmtu_adjustment(inp, stcb, net, net->mtu - sizeof(struct udphdr));
5901                         }
5902                         net->port = port;
5903                 }
5904                 if ((net != NULL) && (m->m_flags & M_FLOWID)) {
5905                         net->flowid = m->m_pkthdr.flowid;
5906 #ifdef INVARIANTS
5907                         net->flowidset = 1;
5908 #endif
5909                 }
5910                 if ((inp) && (stcb)) {
5911                         sctp_send_packet_dropped(stcb, net, m, iphlen, 1);
5912                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED);
5913                 } else if ((inp != NULL) && (stcb == NULL)) {
5914                         refcount_up = 1;
5915                 }
5916                 SCTP_STAT_INCR(sctps_badsum);
5917                 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors);
5918                 goto bad;
5919         }
5920 sctp_skip_csum_4:
5921 #endif
5922         /* destination port of 0 is illegal, based on RFC2960. */
5923         if (sh->dest_port == 0) {
5924                 SCTP_STAT_INCR(sctps_hdrops);
5925                 goto bad;
5926         }
5927         /*
5928          * Locate pcb and tcb for datagram sctp_findassociation_addr() wants
5929          * IP/SCTP/first chunk header...
5930          */
5931         stcb = sctp_findassociation_addr(m, iphlen, offset - sizeof(*ch),
5932             sh, ch, &inp, &net, vrf_id);
5933         if ((net) && (port)) {
5934                 if (net->port == 0) {
5935                         sctp_pathmtu_adjustment(inp, stcb, net, net->mtu - sizeof(struct udphdr));
5936                 }
5937                 net->port = port;
5938         }
5939         if ((net != NULL) && (m->m_flags & M_FLOWID)) {
5940                 net->flowid = m->m_pkthdr.flowid;
5941 #ifdef INVARIANTS
5942                 net->flowidset = 1;
5943 #endif
5944         }
5945         /* inp's ref-count increased && stcb locked */
5946         if (inp == NULL) {
5947                 struct sctp_init_chunk *init_chk, chunk_buf;
5948
5949                 SCTP_STAT_INCR(sctps_noport);
5950 #ifdef ICMP_BANDLIM
5951                 /*
5952                  * we use the bandwidth limiting to protect against sending
5953                  * too many ABORTS all at once. In this case these count the
5954                  * same as an ICMP message.
5955                  */
5956                 if (badport_bandlim(0) < 0)
5957                         goto bad;
5958 #endif                          /* ICMP_BANDLIM */
5959                 SCTPDBG(SCTP_DEBUG_INPUT1,
5960                     "Sending a ABORT from packet entry!\n");
5961                 if (ch->chunk_type == SCTP_INITIATION) {
5962                         /*
5963                          * we do a trick here to get the INIT tag, dig in
5964                          * and get the tag from the INIT and put it in the
5965                          * common header.
5966                          */
5967                         init_chk = (struct sctp_init_chunk *)sctp_m_getptr(m,
5968                             iphlen + sizeof(*sh), sizeof(*init_chk),
5969                             (uint8_t *) & chunk_buf);
5970                         if (init_chk != NULL)
5971                                 sh->v_tag = init_chk->init.initiate_tag;
5972                 }
5973                 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
5974                         sctp_send_shutdown_complete2(m, iphlen, sh, vrf_id, port);
5975                         goto bad;
5976                 }
5977                 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) {
5978                         goto bad;
5979                 }
5980                 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION)
5981                         sctp_send_abort(m, iphlen, sh, 0, NULL, vrf_id, port);
5982                 goto bad;
5983         } else if (stcb == NULL) {
5984                 refcount_up = 1;
5985         }
5986 #ifdef IPSEC
5987         /*
5988          * I very much doubt any of the IPSEC stuff will work but I have no
5989          * idea, so I will leave it in place.
5990          */
5991         if (inp && ipsec4_in_reject(m, &inp->ip_inp.inp)) {
5992                 MODULE_GLOBAL(ipsec4stat).in_polvio++;
5993                 SCTP_STAT_INCR(sctps_hdrops);
5994                 goto bad;
5995         }
5996 #endif                          /* IPSEC */
5997
5998         /*
5999          * common chunk processing
6000          */
6001         length = ip->ip_len + iphlen;
6002         offset -= sizeof(struct sctp_chunkhdr);
6003
6004         ecn_bits = ip->ip_tos;
6005
6006         /* sa_ignore NO_NULL_CHK */
6007         sctp_common_input_processing(&m, iphlen, offset, length, sh, ch,
6008             inp, stcb, net, ecn_bits, vrf_id, port);
6009         /* inp's ref-count reduced && stcb unlocked */
6010         if (m) {
6011                 sctp_m_freem(m);
6012         }
6013         if ((inp) && (refcount_up)) {
6014                 /* reduce ref-count */
6015                 SCTP_INP_DECR_REF(inp);
6016         }
6017         return;
6018 bad:
6019         if (stcb) {
6020                 SCTP_TCB_UNLOCK(stcb);
6021         }
6022         if ((inp) && (refcount_up)) {
6023                 /* reduce ref-count */
6024                 SCTP_INP_DECR_REF(inp);
6025         }
6026         if (m) {
6027                 sctp_m_freem(m);
6028         }
6029         return;
6030 }
6031
6032 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
6033 extern int *sctp_cpuarry;
6034
6035 #endif
6036
6037 void
6038 sctp_input(struct mbuf *m, int off)
6039 {
6040 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
6041         struct ip *ip;
6042         struct sctphdr *sh;
6043         int offset;
6044         int cpu_to_use;
6045         uint32_t flowid, tag;
6046
6047         if (mp_ncpus > 1) {
6048                 if (m->m_flags & M_FLOWID) {
6049                         flowid = m->m_pkthdr.flowid;
6050                 } else {
6051                         /*
6052                          * No flow id built by lower layers fix it so we
6053                          * create one.
6054                          */
6055                         ip = mtod(m, struct ip *);
6056                         offset = off + sizeof(*sh);
6057                         if (SCTP_BUF_LEN(m) < offset) {
6058                                 if ((m = m_pullup(m, offset)) == 0) {
6059                                         SCTP_STAT_INCR(sctps_hdrops);
6060                                         return;
6061                                 }
6062                                 ip = mtod(m, struct ip *);
6063                         }
6064                         sh = (struct sctphdr *)((caddr_t)ip + off);
6065                         tag = htonl(sh->v_tag);
6066                         flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port);
6067                         m->m_pkthdr.flowid = flowid;
6068                         m->m_flags |= M_FLOWID;
6069                 }
6070                 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus];
6071                 sctp_queue_to_mcore(m, off, cpu_to_use);
6072                 return;
6073         }
6074 #endif
6075         sctp_input_with_port(m, off, 0);
6076 }
6077
6078 #endif