sys/netinet/sctp_input.c

   1 /*-
   2  * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions are met:
   6  *
   7  * a) Redistributions of source code must retain the above copyright notice,
   8  *   this list of conditions and the following disclaimer.
   9  *
  10  * b) Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in
  12  *   the documentation and/or other materials provided with the distribution.
  13  *
  14  * c) Neither the name of Cisco Systems, Inc. nor the names of its
  15  *    contributors may be used to endorse or promote products derived
  16  *    from this software without specific prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  20  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  21  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  22  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  23  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  24  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  25  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  26  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  27  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  28  * THE POSSIBILITY OF SUCH DAMAGE.
  29  */
  30
  31 /* $KAME: sctp_input.c,v 1.27 2005/03/06 16:04:17 itojun Exp $   */
  32
  33 #include <sys/cdefs.h>
  34 __FBSDID("$FreeBSD$");
  35
  36 #include <netinet/sctp_os.h>
  37 #include <netinet/sctp_var.h>
  38 #include <netinet/sctp_sysctl.h>
  39 #include <netinet/sctp_pcb.h>
  40 #include <netinet/sctp_header.h>
  41 #include <netinet/sctputil.h>
  42 #include <netinet/sctp_output.h>
  43 #include <netinet/sctp_input.h>
  44 #include <netinet/sctp_auth.h>
  45 #include <netinet/sctp_indata.h>
  46 #include <netinet/sctp_asconf.h>
  47 #include <netinet/sctp_bsd_addr.h>
  48 #include <netinet/sctp_timer.h>
  49 #include <netinet/sctp_crc32.h>
  50 #include <netinet/udp.h>
  51
  52
  53
  54 static void
  55 sctp_stop_all_cookie_timers(struct sctp_tcb *stcb)
  56 {
  57         struct sctp_nets *net;
  58
  59         /*
  60          * This now not only stops all cookie timers it also stops any INIT
  61          * timers as well. This will make sure that the timers are stopped
  62          * in all collision cases.
  63          */
  64         SCTP_TCB_LOCK_ASSERT(stcb);
  65         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
  66                 if (net->rxt_timer.type == SCTP_TIMER_TYPE_COOKIE) {
  67                         sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE,
  68                             stcb->sctp_ep,
  69                             stcb,
  70                             net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_1);
  71                 } else if (net->rxt_timer.type == SCTP_TIMER_TYPE_INIT) {
  72                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT,
  73                             stcb->sctp_ep,
  74                             stcb,
  75                             net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_2);
  76                 }
  77         }
  78 }
  79
  80 /* INIT handler */
  81 static void
  82 sctp_handle_init(struct mbuf *m, int iphlen, int offset, struct sctphdr *sh,
  83     struct sctp_init_chunk *cp, struct sctp_inpcb *inp, struct sctp_tcb *stcb,
  84     struct sctp_nets *net, int *abort_no_unlock, uint32_t vrf_id, uint16_t port)
  85 {
  86         struct sctp_init *init;
  87         struct mbuf *op_err;
  88         uint32_t init_limit;
  89
  90         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_init: handling INIT tcb:%p\n",
  91             stcb);
  92         if (stcb == NULL) {
  93                 SCTP_INP_RLOCK(inp);
  94                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
  95                         goto outnow;
  96                 }
  97         }
  98         op_err = NULL;
  99         init = &cp->init;
 100         /* First are we accepting? */
 101         if ((inp->sctp_socket->so_qlimit == 0) && (stcb == NULL)) {
 102                 SCTPDBG(SCTP_DEBUG_INPUT2,
 103                     "sctp_handle_init: Abort, so_qlimit:%d\n",
 104                     inp->sctp_socket->so_qlimit);
 105                 /*
 106                  * FIX ME ?? What about TCP model and we have a
 107                  * match/restart case? Actually no fix is needed. the lookup
 108                  * will always find the existing assoc so stcb would not be
 109                  * NULL. It may be questionable to do this since we COULD
 110                  * just send back the INIT-ACK and hope that the app did
 111                  * accept()'s by the time the COOKIE was sent. But there is
 112                  * a price to pay for COOKIE generation and I don't want to
 113                  * pay it on the chance that the app will actually do some
 114                  * accepts(). The App just looses and should NOT be in this
 115                  * state :-)
 116                  */
 117                 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err,
 118                     vrf_id, port);
 119                 if (stcb)
 120                         *abort_no_unlock = 1;
 121                 goto outnow;
 122         }
 123         if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_chunk)) {
 124                 /* Invalid length */
 125                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
 126                 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err,
 127                     vrf_id, port);
 128                 if (stcb)
 129                         *abort_no_unlock = 1;
 130                 goto outnow;
 131         }
 132         /* validate parameters */
 133         if (init->initiate_tag == 0) {
 134                 /* protocol error... send abort */
 135                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
 136                 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err,
 137                     vrf_id, port);
 138                 if (stcb)
 139                         *abort_no_unlock = 1;
 140                 goto outnow;
 141         }
 142         if (ntohl(init->a_rwnd) < SCTP_MIN_RWND) {
 143                 /* invalid parameter... send abort */
 144                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
 145                 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err,
 146                     vrf_id, port);
 147                 if (stcb)
 148                         *abort_no_unlock = 1;
 149                 goto outnow;
 150         }
 151         if (init->num_inbound_streams == 0) {
 152                 /* protocol error... send abort */
 153                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
 154                 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err,
 155                     vrf_id, port);
 156                 if (stcb)
 157                         *abort_no_unlock = 1;
 158                 goto outnow;
 159         }
 160         if (init->num_outbound_streams == 0) {
 161                 /* protocol error... send abort */
 162                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
 163                 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err,
 164                     vrf_id, port);
 165                 if (stcb)
 166                         *abort_no_unlock = 1;
 167                 goto outnow;
 168         }
 169         init_limit = offset + ntohs(cp->ch.chunk_length);
 170         if (sctp_validate_init_auth_params(m, offset + sizeof(*cp),
 171             init_limit)) {
 172                 /* auth parameter(s) error... send abort */
 173                 sctp_abort_association(inp, stcb, m, iphlen, sh, NULL, vrf_id, port);
 174                 if (stcb)
 175                         *abort_no_unlock = 1;
 176                 goto outnow;
 177         }
 178         /* send an INIT-ACK w/cookie */
 179         SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n");
 180         sctp_send_initiate_ack(inp, stcb, m, iphlen, offset, sh, cp, vrf_id, port,
 181             ((stcb == NULL) ? SCTP_HOLDS_LOCK : SCTP_NOT_LOCKED));
 182 outnow:
 183         if (stcb == NULL) {
 184                 SCTP_INP_RUNLOCK(inp);
 185         }
 186 }
 187
 188 /*
 189  * process peer "INIT/INIT-ACK" chunk returns value < 0 on error
 190  */
 191
 192 int
 193 sctp_is_there_unsent_data(struct sctp_tcb *stcb)
 194 {
 195         int unsent_data = 0;
 196         struct sctp_stream_queue_pending *sp;
 197         struct sctp_stream_out *strq;
 198         struct sctp_association *asoc;
 199
 200         /*
 201          * This function returns the number of streams that have true unsent
 202          * data on them. Note that as it looks through it will clean up any
 203          * places that have old data that has been sent but left at top of
 204          * stream queue.
 205          */
 206         asoc = &stcb->asoc;
 207         SCTP_TCB_SEND_LOCK(stcb);
 208         if (!TAILQ_EMPTY(&asoc->out_wheel)) {
 209                 /* Check to see if some data queued */
 210                 TAILQ_FOREACH(strq, &asoc->out_wheel, next_spoke) {
 211         is_there_another:
 212                         /* sa_ignore FREED_MEMORY */
 213                         sp = TAILQ_FIRST(&strq->outqueue);
 214                         if (sp == NULL) {
 215                                 continue;
 216                         }
 217                         if ((sp->msg_is_complete) &&
 218                             (sp->length == 0) &&
 219                             (sp->sender_all_done)) {
 220                                 /*
 221                                  * We are doing differed cleanup. Last time
 222                                  * through when we took all the data the
 223                                  * sender_all_done was not set.
 224                                  */
 225                                 if (sp->put_last_out == 0) {
 226                                         SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
 227                                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n",
 228                                             sp->sender_all_done,
 229                                             sp->length,
 230                                             sp->msg_is_complete,
 231                                             sp->put_last_out);
 232                                 }
 233                                 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1);
 234                                 TAILQ_REMOVE(&strq->outqueue, sp, next);
 235                                 sctp_free_remote_addr(sp->net);
 236                                 if (sp->data) {
 237                                         sctp_m_freem(sp->data);
 238                                         sp->data = NULL;
 239                                 }
 240                                 sctp_free_a_strmoq(stcb, sp);
 241                                 goto is_there_another;
 242                         } else {
 243                                 unsent_data++;
 244                                 continue;
 245                         }
 246                 }
 247         }
 248         SCTP_TCB_SEND_UNLOCK(stcb);
 249         return (unsent_data);
 250 }
 251
 252 static int
 253 sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb,
 254     struct sctp_nets *net)
 255 {
 256         struct sctp_init *init;
 257         struct sctp_association *asoc;
 258         struct sctp_nets *lnet;
 259         unsigned int i;
 260
 261         init = &cp->init;
 262         asoc = &stcb->asoc;
 263         /* save off parameters */
 264         asoc->peer_vtag = ntohl(init->initiate_tag);
 265         asoc->peers_rwnd = ntohl(init->a_rwnd);
 266         if (TAILQ_FIRST(&asoc->nets)) {
 267                 /* update any ssthresh's that may have a default */
 268                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
 269                         lnet->ssthresh = asoc->peers_rwnd;
 270
 271                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) {
 272                                 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION);
 273                         }
 274                 }
 275         }
 276         SCTP_TCB_SEND_LOCK(stcb);
 277         if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) {
 278                 unsigned int newcnt;
 279                 struct sctp_stream_out *outs;
 280                 struct sctp_stream_queue_pending *sp;
 281                 struct sctp_tmit_chunk *chk, *chk_next;
 282
 283                 /* abandon the upper streams */
 284                 newcnt = ntohs(init->num_inbound_streams);
 285                 if (!TAILQ_EMPTY(&asoc->send_queue)) {
 286                         chk = TAILQ_FIRST(&asoc->send_queue);
 287                         while (chk) {
 288                                 chk_next = TAILQ_NEXT(chk, sctp_next);
 289                                 if (chk->rec.data.stream_number >= newcnt) {
 290                                         TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next);
 291                                         asoc->send_queue_cnt--;
 292                                         if (chk->data != NULL) {
 293                                                 sctp_free_bufspace(stcb, asoc, chk, 1);
 294                                                 sctp_ulp_notify(SCTP_NOTIFY_DG_FAIL, stcb,
 295                                                     SCTP_NOTIFY_DATAGRAM_UNSENT, chk, SCTP_SO_NOT_LOCKED);
 296                                                 if (chk->data) {
 297                                                         sctp_m_freem(chk->data);
 298                                                         chk->data = NULL;
 299                                                 }
 300                                         }
 301                                         sctp_free_a_chunk(stcb, chk);
 302                                         /* sa_ignore FREED_MEMORY */
 303                                 }
 304                                 chk = chk_next;
 305                         }
 306                 }
 307                 if (asoc->strmout) {
 308                         for (i = newcnt; i < asoc->pre_open_streams; i++) {
 309                                 outs = &asoc->strmout[i];
 310                                 sp = TAILQ_FIRST(&outs->outqueue);
 311                                 while (sp) {
 312                                         TAILQ_REMOVE(&outs->outqueue, sp, next);
 313                                         asoc->stream_queue_cnt--;
 314                                         sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL,
 315                                             stcb, SCTP_NOTIFY_DATAGRAM_UNSENT,
 316                                             sp, SCTP_SO_NOT_LOCKED);
 317                                         if (sp->data) {
 318                                                 sctp_m_freem(sp->data);
 319                                                 sp->data = NULL;
 320                                         }
 321                                         sctp_free_remote_addr(sp->net);
 322                                         sp->net = NULL;
 323                                         /* Free the chunk */
 324                                         sctp_free_a_strmoq(stcb, sp);
 325                                         /* sa_ignore FREED_MEMORY */
 326                                         sp = TAILQ_FIRST(&outs->outqueue);
 327                                 }
 328                         }
 329                 }
 330                 /* cut back the count */
 331                 asoc->pre_open_streams = newcnt;
 332         }
 333         SCTP_TCB_SEND_UNLOCK(stcb);
 334         asoc->strm_realoutsize = asoc->streamoutcnt = asoc->pre_open_streams;
 335         /* init tsn's */
 336         asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1;
 337         /* EY - nr_sack: initialize highest tsn in nr_mapping_array */
 338         asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
 339         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
 340                 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
 341         }
 342         /* This is the next one we expect */
 343         asoc->str_reset_seq_in = asoc->asconf_seq_in + 1;
 344
 345         asoc->mapping_array_base_tsn = ntohl(init->initial_tsn);
 346         /*
 347          * EY 05/13/08 - nr_sack: initialize nr_mapping array's base tsn
 348          * like above
 349          */
 350         asoc->nr_mapping_array_base_tsn = ntohl(init->initial_tsn);
 351         asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in;
 352         asoc->last_echo_tsn = asoc->asconf_seq_in;
 353         asoc->advanced_peer_ack_point = asoc->last_acked_seq;
 354         /* open the requested streams */
 355
 356         if (asoc->strmin != NULL) {
 357                 /* Free the old ones */
 358                 struct sctp_queued_to_read *ctl;
 359
 360                 for (i = 0; i < asoc->streamincnt; i++) {
 361                         ctl = TAILQ_FIRST(&asoc->strmin[i].inqueue);
 362                         while (ctl) {
 363                                 TAILQ_REMOVE(&asoc->strmin[i].inqueue, ctl, next);
 364                                 sctp_free_remote_addr(ctl->whoFrom);
 365                                 ctl->whoFrom = NULL;
 366                                 sctp_m_freem(ctl->data);
 367                                 ctl->data = NULL;
 368                                 sctp_free_a_readq(stcb, ctl);
 369                                 ctl = TAILQ_FIRST(&asoc->strmin[i].inqueue);
 370                         }
 371                 }
 372                 SCTP_FREE(asoc->strmin, SCTP_M_STRMI);
 373         }
 374         asoc->streamincnt = ntohs(init->num_outbound_streams);
 375         if (asoc->streamincnt > MAX_SCTP_STREAMS) {
 376                 asoc->streamincnt = MAX_SCTP_STREAMS;
 377         }
 378         SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt *
 379             sizeof(struct sctp_stream_in), SCTP_M_STRMI);
 380         if (asoc->strmin == NULL) {
 381                 /* we didn't get memory for the streams! */
 382                 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n");
 383                 return (-1);
 384         }
 385         for (i = 0; i < asoc->streamincnt; i++) {
 386                 asoc->strmin[i].stream_no = i;
 387                 asoc->strmin[i].last_sequence_delivered = 0xffff;
 388                 /*
 389                  * U-stream ranges will be set when the cookie is unpacked.
 390                  * Or for the INIT sender they are un set (if pr-sctp not
 391                  * supported) when the INIT-ACK arrives.
 392                  */
 393                 TAILQ_INIT(&asoc->strmin[i].inqueue);
 394                 asoc->strmin[i].delivery_started = 0;
 395         }
 396         /*
 397          * load_address_from_init will put the addresses into the
 398          * association when the COOKIE is processed or the INIT-ACK is
 399          * processed. Both types of COOKIE's existing and new call this
 400          * routine. It will remove addresses that are no longer in the
 401          * association (for the restarting case where addresses are
 402          * removed). Up front when the INIT arrives we will discard it if it
 403          * is a restart and new addresses have been added.
 404          */
 405         /* sa_ignore MEMLEAK */
 406         return (0);
 407 }
 408
 409 /*
 410  * INIT-ACK message processing/consumption returns value < 0 on error
 411  */
 412 static int
 413 sctp_process_init_ack(struct mbuf *m, int iphlen, int offset,
 414     struct sctphdr *sh, struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
 415     struct sctp_nets *net, int *abort_no_unlock, uint32_t vrf_id)
 416 {
 417         struct sctp_association *asoc;
 418         struct mbuf *op_err;
 419         int retval, abort_flag;
 420         uint32_t initack_limit;
 421         int nat_friendly = 0;
 422
 423         /* First verify that we have no illegal param's */
 424         abort_flag = 0;
 425         op_err = NULL;
 426
 427         op_err = sctp_arethere_unrecognized_parameters(m,
 428             (offset + sizeof(struct sctp_init_chunk)),
 429             &abort_flag, (struct sctp_chunkhdr *)cp, &nat_friendly);
 430         if (abort_flag) {
 431                 /* Send an abort and notify peer */
 432                 sctp_abort_an_association(stcb->sctp_ep, stcb, SCTP_CAUSE_PROTOCOL_VIOLATION, op_err, SCTP_SO_NOT_LOCKED);
 433                 *abort_no_unlock = 1;
 434                 return (-1);
 435         }
 436         asoc = &stcb->asoc;
 437         asoc->peer_supports_nat = (uint8_t) nat_friendly;
 438         /* process the peer's parameters in the INIT-ACK */
 439         retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb, net);
 440         if (retval < 0) {
 441                 return (retval);
 442         }
 443         initack_limit = offset + ntohs(cp->ch.chunk_length);
 444         /* load all addresses */
 445         if ((retval = sctp_load_addresses_from_init(stcb, m, iphlen,
 446             (offset + sizeof(struct sctp_init_chunk)), initack_limit, sh,
 447             NULL))) {
 448                 /* Huh, we should abort */
 449                 SCTPDBG(SCTP_DEBUG_INPUT1,
 450                     "Load addresses from INIT causes an abort %d\n",
 451                     retval);
 452                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh,
 453                     NULL, 0, net->port);
 454                 *abort_no_unlock = 1;
 455                 return (-1);
 456         }
 457         /* if the peer doesn't support asconf, flush the asconf queue */
 458         if (asoc->peer_supports_asconf == 0) {
 459                 struct sctp_asconf_addr *aparam;
 460
 461                 while (!TAILQ_EMPTY(&asoc->asconf_queue)) {
 462                         /* sa_ignore FREED_MEMORY */
 463                         aparam = TAILQ_FIRST(&asoc->asconf_queue);
 464                         TAILQ_REMOVE(&asoc->asconf_queue, aparam, next);
 465                         SCTP_FREE(aparam, SCTP_M_ASC_ADDR);
 466                 }
 467         }
 468         stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs,
 469             stcb->asoc.local_hmacs);
 470         if (op_err) {
 471                 sctp_queue_op_err(stcb, op_err);
 472                 /* queuing will steal away the mbuf chain to the out queue */
 473                 op_err = NULL;
 474         }
 475         /* extract the cookie and queue it to "echo" it back... */
 476         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 477                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
 478                     stcb->asoc.overall_error_count,
 479                     0,
 480                     SCTP_FROM_SCTP_INPUT,
 481                     __LINE__);
 482         }
 483         stcb->asoc.overall_error_count = 0;
 484         net->error_count = 0;
 485
 486         /*
 487          * Cancel the INIT timer, We do this first before queueing the
 488          * cookie. We always cancel at the primary to assue that we are
 489          * canceling the timer started by the INIT which always goes to the
 490          * primary.
 491          */
 492         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb,
 493             asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4);
 494
 495         /* calculate the RTO */
 496         net->RTO = sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, sctp_align_safe_nocopy);
 497
 498         retval = sctp_send_cookie_echo(m, offset, stcb, net);
 499         if (retval < 0) {
 500                 /*
 501                  * No cookie, we probably should send a op error. But in any
 502                  * case if there is no cookie in the INIT-ACK, we can
 503                  * abandon the peer, its broke.
 504                  */
 505                 if (retval == -3) {
 506                         /* We abort with an error of missing mandatory param */
 507                         op_err =
 508                             sctp_generate_invmanparam(SCTP_CAUSE_MISSING_PARAM);
 509                         if (op_err) {
 510                                 /*
 511                                  * Expand beyond to include the mandatory
 512                                  * param cookie
 513                                  */
 514                                 struct sctp_inv_mandatory_param *mp;
 515
 516                                 SCTP_BUF_LEN(op_err) =
 517                                     sizeof(struct sctp_inv_mandatory_param);
 518                                 mp = mtod(op_err,
 519                                     struct sctp_inv_mandatory_param *);
 520                                 /* Subtract the reserved param */
 521                                 mp->length =
 522                                     htons(sizeof(struct sctp_inv_mandatory_param) - 2);
 523                                 mp->num_param = htonl(1);
 524                                 mp->param = htons(SCTP_STATE_COOKIE);
 525                                 mp->resv = 0;
 526                         }
 527                         sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
 528                             sh, op_err, 0, net->port);
 529                         *abort_no_unlock = 1;
 530                 }
 531                 return (retval);
 532         }
 533         return (0);
 534 }
 535
 536 static void
 537 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp,
 538     struct sctp_tcb *stcb, struct sctp_nets *net)
 539 {
 540         struct sockaddr_storage store;
 541         struct sockaddr_in *sin;
 542         struct sockaddr_in6 *sin6;
 543         struct sctp_nets *r_net;
 544         struct timeval tv;
 545         int req_prim = 0;
 546
 547         if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) {
 548                 /* Invalid length */
 549                 return;
 550         }
 551         sin = (struct sockaddr_in *)&store;
 552         sin6 = (struct sockaddr_in6 *)&store;
 553
 554         memset(&store, 0, sizeof(store));
 555         if (cp->heartbeat.hb_info.addr_family == AF_INET &&
 556             cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) {
 557                 sin->sin_family = cp->heartbeat.hb_info.addr_family;
 558                 sin->sin_len = cp->heartbeat.hb_info.addr_len;
 559                 sin->sin_port = stcb->rport;
 560                 memcpy(&sin->sin_addr, cp->heartbeat.hb_info.address,
 561                     sizeof(sin->sin_addr));
 562         } else if (cp->heartbeat.hb_info.addr_family == AF_INET6 &&
 563             cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) {
 564                 sin6->sin6_family = cp->heartbeat.hb_info.addr_family;
 565                 sin6->sin6_len = cp->heartbeat.hb_info.addr_len;
 566                 sin6->sin6_port = stcb->rport;
 567                 memcpy(&sin6->sin6_addr, cp->heartbeat.hb_info.address,
 568                     sizeof(sin6->sin6_addr));
 569         } else {
 570                 return;
 571         }
 572         r_net = sctp_findnet(stcb, (struct sockaddr *)sin);
 573         if (r_net == NULL) {
 574                 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n");
 575                 return;
 576         }
 577         if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) &&
 578             (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) &&
 579             (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) {
 580                 /*
 581                  * If the its a HB and it's random value is correct when can
 582                  * confirm the destination.
 583                  */
 584                 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
 585                 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) {
 586                         stcb->asoc.primary_destination = r_net;
 587                         r_net->dest_state &= ~SCTP_ADDR_WAS_PRIMARY;
 588                         r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY;
 589                         r_net = TAILQ_FIRST(&stcb->asoc.nets);
 590                         if (r_net != stcb->asoc.primary_destination) {
 591                                 /*
 592                                  * first one on the list is NOT the primary
 593                                  * sctp_cmpaddr() is much more efficent if
 594                                  * the primary is the first on the list,
 595                                  * make it so.
 596                                  */
 597                                 TAILQ_REMOVE(&stcb->asoc.nets, stcb->asoc.primary_destination, sctp_next);
 598                                 TAILQ_INSERT_HEAD(&stcb->asoc.nets, stcb->asoc.primary_destination, sctp_next);
 599                         }
 600                         req_prim = 1;
 601                 }
 602                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
 603                     stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED);
 604         }
 605         r_net->error_count = 0;
 606         r_net->hb_responded = 1;
 607         tv.tv_sec = cp->heartbeat.hb_info.time_value_1;
 608         tv.tv_usec = cp->heartbeat.hb_info.time_value_2;
 609         if (r_net->dest_state & SCTP_ADDR_NOT_REACHABLE) {
 610                 r_net->dest_state &= ~SCTP_ADDR_NOT_REACHABLE;
 611                 r_net->dest_state |= SCTP_ADDR_REACHABLE;
 612                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb,
 613                     SCTP_HEARTBEAT_SUCCESS, (void *)r_net, SCTP_SO_NOT_LOCKED);
 614                 /* now was it the primary? if so restore */
 615                 if (r_net->dest_state & SCTP_ADDR_WAS_PRIMARY) {
 616                         (void)sctp_set_primary_addr(stcb, (struct sockaddr *)NULL, r_net);
 617                 }
 618         }
 619         /*
 620          * JRS 5/14/07 - If CMT PF is on and the destination is in PF state,
 621          * set the destination to active state and set the cwnd to one or
 622          * two MTU's based on whether PF1 or PF2 is being used. If a T3
 623          * timer is running, for the destination, stop the timer because a
 624          * PF-heartbeat was received.
 625          */
 626         if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) &&
 627             SCTP_BASE_SYSCTL(sctp_cmt_pf) &&
 628             (net->dest_state & SCTP_ADDR_PF) == SCTP_ADDR_PF) {
 629                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
 630                         sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
 631                             stcb, net,
 632                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_5);
 633                 }
 634                 net->dest_state &= ~SCTP_ADDR_PF;
 635                 net->cwnd = net->mtu * SCTP_BASE_SYSCTL(sctp_cmt_pf);
 636                 SCTPDBG(SCTP_DEBUG_INPUT1, "Destination %p moved from PF to reachable with cwnd %d.\n",
 637                     net, net->cwnd);
 638         }
 639         /* Now lets do a RTO with this */
 640         r_net->RTO = sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, sctp_align_safe_nocopy);
 641         /* Mobility adaptation */
 642         if (req_prim) {
 643                 if ((sctp_is_mobility_feature_on(stcb->sctp_ep,
 644                     SCTP_MOBILITY_BASE) ||
 645                     sctp_is_mobility_feature_on(stcb->sctp_ep,
 646                     SCTP_MOBILITY_FASTHANDOFF)) &&
 647                     sctp_is_mobility_feature_on(stcb->sctp_ep,
 648                     SCTP_MOBILITY_PRIM_DELETED)) {
 649
 650                         sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED, stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_TIMER + SCTP_LOC_7);
 651                         if (sctp_is_mobility_feature_on(stcb->sctp_ep,
 652                             SCTP_MOBILITY_FASTHANDOFF)) {
 653                                 sctp_assoc_immediate_retrans(stcb,
 654                                     stcb->asoc.primary_destination);
 655                         }
 656                         if (sctp_is_mobility_feature_on(stcb->sctp_ep,
 657                             SCTP_MOBILITY_BASE)) {
 658                                 sctp_move_chunks_from_deleted_prim(stcb,
 659                                     stcb->asoc.primary_destination);
 660                         }
 661                         sctp_delete_prim_timer(stcb->sctp_ep, stcb,
 662                             stcb->asoc.deleted_primary);
 663                 }
 664         }
 665 }
 666
 667 static int
 668 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb)
 669 {
 670         /*
 671          * return 0 means we want you to proceed with the abort non-zero
 672          * means no abort processing
 673          */
 674         struct sctpasochead *head;
 675
 676         if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_WAIT) {
 677                 /* generate a new vtag and send init */
 678                 LIST_REMOVE(stcb, sctp_asocs);
 679                 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1);
 680                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
 681                 /*
 682                  * put it in the bucket in the vtag hash of assoc's for the
 683                  * system
 684                  */
 685                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
 686                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
 687                 return (1);
 688         }
 689         if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) {
 690                 /*
 691                  * treat like a case where the cookie expired i.e.: - dump
 692                  * current cookie. - generate a new vtag. - resend init.
 693                  */
 694                 /* generate a new vtag and send init */
 695                 LIST_REMOVE(stcb, sctp_asocs);
 696                 stcb->asoc.state &= ~SCTP_STATE_COOKIE_ECHOED;
 697                 stcb->asoc.state |= SCTP_STATE_COOKIE_WAIT;
 698                 sctp_stop_all_cookie_timers(stcb);
 699                 sctp_toss_old_cookies(stcb, &stcb->asoc);
 700                 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1);
 701                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
 702                 /*
 703                  * put it in the bucket in the vtag hash of assoc's for the
 704                  * system
 705                  */
 706                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
 707                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
 708                 return (1);
 709         }
 710         return (0);
 711 }
 712
 713 static int
 714 sctp_handle_nat_missing_state(struct sctp_tcb *stcb,
 715     struct sctp_nets *net)
 716 {
 717         /*
 718          * return 0 means we want you to proceed with the abort non-zero
 719          * means no abort processing
 720          */
 721         if (stcb->asoc.peer_supports_auth == 0) {
 722                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n");
 723                 return (0);
 724         }
 725         sctp_asconf_send_nat_state_update(stcb, net);
 726         return (1);
 727 }
 728
 729
 730 static void
 731 sctp_handle_abort(struct sctp_abort_chunk *cp,
 732     struct sctp_tcb *stcb, struct sctp_nets *net)
 733 {
 734 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 735         struct socket *so;
 736
 737 #endif
 738         uint16_t len;
 739
 740         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n");
 741         if (stcb == NULL)
 742                 return;
 743
 744         len = ntohs(cp->ch.chunk_length);
 745         if (len > sizeof(struct sctp_chunkhdr)) {
 746                 /*
 747                  * Need to check the cause codes for our two magic nat
 748                  * aborts which don't kill the assoc necessarily.
 749                  */
 750                 struct sctp_abort_chunk *cpnext;
 751                 struct sctp_missing_nat_state *natc;
 752                 uint16_t cause;
 753
 754                 cpnext = cp;
 755                 cpnext++;
 756                 natc = (struct sctp_missing_nat_state *)cpnext;
 757                 cause = ntohs(natc->cause);
 758                 if (cause == SCTP_CAUSE_NAT_COLLIDING_STATE) {
 759                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n",
 760                             cp->ch.chunk_flags);
 761                         if (sctp_handle_nat_colliding_state(stcb)) {
 762                                 return;
 763                         }
 764                 } else if (cause == SCTP_CAUSE_NAT_MISSING_STATE) {
 765                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n",
 766                             cp->ch.chunk_flags);
 767                         if (sctp_handle_nat_missing_state(stcb, net)) {
 768                                 return;
 769                         }
 770                 }
 771         }
 772         /* stop any receive timers */
 773         sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_6);
 774         /* notify user of the abort and clean up... */
 775         sctp_abort_notification(stcb, 0, SCTP_SO_NOT_LOCKED);
 776         /* free the tcb */
 777 #if defined(SCTP_PANIC_ON_ABORT)
 778         printf("stcb:%p state:%d rport:%d net:%p\n",
 779             stcb, stcb->asoc.state, stcb->rport, net);
 780         if (!(stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET)) {
 781                 panic("Received an ABORT");
 782         } else {
 783                 printf("No panic its in state %x closed\n", stcb->asoc.state);
 784         }
 785 #endif
 786         SCTP_STAT_INCR_COUNTER32(sctps_aborted);
 787         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) ||
 788             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
 789                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 790         }
 791 #ifdef SCTP_ASOCLOG_OF_TSNS
 792         sctp_print_out_track_log(stcb);
 793 #endif
 794 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 795         so = SCTP_INP_SO(stcb->sctp_ep);
 796         atomic_add_int(&stcb->asoc.refcnt, 1);
 797         SCTP_TCB_UNLOCK(stcb);
 798         SCTP_SOCKET_LOCK(so, 1);
 799         SCTP_TCB_LOCK(stcb);
 800         atomic_subtract_int(&stcb->asoc.refcnt, 1);
 801 #endif
 802         stcb->asoc.state |= SCTP_STATE_WAS_ABORTED;
 803         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
 804             SCTP_FROM_SCTP_INPUT + SCTP_LOC_6);
 805 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 806         SCTP_SOCKET_UNLOCK(so, 1);
 807 #endif
 808         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n");
 809 }
 810
 811 static void
 812 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp,
 813     struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag)
 814 {
 815         struct sctp_association *asoc;
 816         int some_on_streamwheel;
 817
 818 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 819         struct socket *so;
 820
 821 #endif
 822
 823         SCTPDBG(SCTP_DEBUG_INPUT2,
 824             "sctp_handle_shutdown: handling SHUTDOWN\n");
 825         if (stcb == NULL)
 826                 return;
 827         asoc = &stcb->asoc;
 828         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
 829             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
 830                 return;
 831         }
 832         if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) {
 833                 /* Shutdown NOT the expected size */
 834                 return;
 835         } else {
 836                 sctp_update_acked(stcb, cp, net, abort_flag);
 837                 if (*abort_flag) {
 838                         return;
 839                 }
 840         }
 841         if (asoc->control_pdapi) {
 842                 /*
 843                  * With a normal shutdown we assume the end of last record.
 844                  */
 845                 SCTP_INP_READ_LOCK(stcb->sctp_ep);
 846                 asoc->control_pdapi->end_added = 1;
 847                 asoc->control_pdapi->pdapi_aborted = 1;
 848                 asoc->control_pdapi = NULL;
 849                 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
 850 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 851                 so = SCTP_INP_SO(stcb->sctp_ep);
 852                 atomic_add_int(&stcb->asoc.refcnt, 1);
 853                 SCTP_TCB_UNLOCK(stcb);
 854                 SCTP_SOCKET_LOCK(so, 1);
 855                 SCTP_TCB_LOCK(stcb);
 856                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 857                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
 858                         /* assoc was freed while we were unlocked */
 859                         SCTP_SOCKET_UNLOCK(so, 1);
 860                         return;
 861                 }
 862 #endif
 863                 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
 864 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 865                 SCTP_SOCKET_UNLOCK(so, 1);
 866 #endif
 867         }
 868         /* goto SHUTDOWN_RECEIVED state to block new requests */
 869         if (stcb->sctp_socket) {
 870                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
 871                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) &&
 872                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) {
 873                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_RECEIVED);
 874                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
 875                         /*
 876                          * notify upper layer that peer has initiated a
 877                          * shutdown
 878                          */
 879                         sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
 880
 881                         /* reset time */
 882                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
 883                 }
 884         }
 885         if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) {
 886                 /*
 887                  * stop the shutdown timer, since we WILL move to
 888                  * SHUTDOWN-ACK-SENT.
 889                  */
 890                 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_8);
 891         }
 892         /* Now is there unsent data on a stream somewhere? */
 893         some_on_streamwheel = sctp_is_there_unsent_data(stcb);
 894
 895         if (!TAILQ_EMPTY(&asoc->send_queue) ||
 896             !TAILQ_EMPTY(&asoc->sent_queue) ||
 897             some_on_streamwheel) {
 898                 /* By returning we will push more data out */
 899                 return;
 900         } else {
 901                 /* no outstanding data to send, so move on... */
 902                 /* send SHUTDOWN-ACK */
 903                 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination);
 904                 /* move to SHUTDOWN-ACK-SENT state */
 905                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
 906                     (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
 907                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 908                 }
 909                 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT);
 910                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
 911                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net,
 912                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_7);
 913                 /* start SHUTDOWN timer */
 914                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep,
 915                     stcb, net);
 916         }
 917 }
 918
 919 static void
 920 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp,
 921     struct sctp_tcb *stcb, struct sctp_nets *net)
 922 {
 923         struct sctp_association *asoc;
 924
 925 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 926         struct socket *so;
 927
 928         so = SCTP_INP_SO(stcb->sctp_ep);
 929 #endif
 930         SCTPDBG(SCTP_DEBUG_INPUT2,
 931             "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n");
 932         if (stcb == NULL)
 933                 return;
 934
 935         asoc = &stcb->asoc;
 936         /* process according to association state */
 937         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
 938             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
 939                 /* unexpected SHUTDOWN-ACK... so ignore... */
 940                 SCTP_TCB_UNLOCK(stcb);
 941                 return;
 942         }
 943         if (asoc->control_pdapi) {
 944                 /*
 945                  * With a normal shutdown we assume the end of last record.
 946                  */
 947                 SCTP_INP_READ_LOCK(stcb->sctp_ep);
 948                 asoc->control_pdapi->end_added = 1;
 949                 asoc->control_pdapi->pdapi_aborted = 1;
 950                 asoc->control_pdapi = NULL;
 951                 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
 952 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 953                 atomic_add_int(&stcb->asoc.refcnt, 1);
 954                 SCTP_TCB_UNLOCK(stcb);
 955                 SCTP_SOCKET_LOCK(so, 1);
 956                 SCTP_TCB_LOCK(stcb);
 957                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 958                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
 959                         /* assoc was freed while we were unlocked */
 960                         SCTP_SOCKET_UNLOCK(so, 1);
 961                         return;
 962                 }
 963 #endif
 964                 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
 965 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 966                 SCTP_SOCKET_UNLOCK(so, 1);
 967 #endif
 968         }
 969         /* are the queues empty? */
 970         if (!TAILQ_EMPTY(&asoc->send_queue) ||
 971             !TAILQ_EMPTY(&asoc->sent_queue) ||
 972             !TAILQ_EMPTY(&asoc->out_wheel)) {
 973                 sctp_report_all_outbound(stcb, 0, SCTP_SO_NOT_LOCKED);
 974         }
 975         /* stop the timer */
 976         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9);
 977         /* send SHUTDOWN-COMPLETE */
 978         sctp_send_shutdown_complete(stcb, net);
 979         /* notify upper layer protocol */
 980         if (stcb->sctp_socket) {
 981                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
 982                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
 983                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
 984                         /* Set the connected flag to disconnected */
 985                         stcb->sctp_ep->sctp_socket->so_snd.sb_cc = 0;
 986                 }
 987         }
 988         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
 989         /* free the TCB but first save off the ep */
 990 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 991         atomic_add_int(&stcb->asoc.refcnt, 1);
 992         SCTP_TCB_UNLOCK(stcb);
 993         SCTP_SOCKET_LOCK(so, 1);
 994         SCTP_TCB_LOCK(stcb);
 995         atomic_subtract_int(&stcb->asoc.refcnt, 1);
 996 #endif
 997         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
 998             SCTP_FROM_SCTP_INPUT + SCTP_LOC_10);
 999 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1000         SCTP_SOCKET_UNLOCK(so, 1);
1001 #endif
1002 }
1003
1004 /*
1005  * Skip past the param header and then we will find the chunk that caused the
1006  * problem. There are two possiblities ASCONF or FWD-TSN other than that and
1007  * our peer must be broken.
1008  */
1009 static void
1010 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr,
1011     struct sctp_nets *net)
1012 {
1013         struct sctp_chunkhdr *chk;
1014
1015         chk = (struct sctp_chunkhdr *)((caddr_t)phdr + sizeof(*phdr));
1016         switch (chk->chunk_type) {
1017         case SCTP_ASCONF_ACK:
1018         case SCTP_ASCONF:
1019                 sctp_asconf_cleanup(stcb, net);
1020                 break;
1021         case SCTP_FORWARD_CUM_TSN:
1022                 stcb->asoc.peer_supports_prsctp = 0;
1023                 break;
1024         default:
1025                 SCTPDBG(SCTP_DEBUG_INPUT2,
1026                     "Peer does not support chunk type %d(%x)??\n",
1027                     chk->chunk_type, (uint32_t) chk->chunk_type);
1028                 break;
1029         }
1030 }
1031
1032 /*
1033  * Skip past the param header and then we will find the param that caused the
1034  * problem.  There are a number of param's in a ASCONF OR the prsctp param
1035  * these will turn of specific features.
1036  */
1037 static void
1038 sctp_process_unrecog_param(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr)
1039 {
1040         struct sctp_paramhdr *pbad;
1041
1042         pbad = phdr + 1;
1043         switch (ntohs(pbad->param_type)) {
1044                 /* pr-sctp draft */
1045         case SCTP_PRSCTP_SUPPORTED:
1046                 stcb->asoc.peer_supports_prsctp = 0;
1047                 break;
1048         case SCTP_SUPPORTED_CHUNK_EXT:
1049                 break;
1050                 /* draft-ietf-tsvwg-addip-sctp */
1051         case SCTP_HAS_NAT_SUPPORT:
1052                 stcb->asoc.peer_supports_nat = 0;
1053                 break;
1054         case SCTP_ECN_NONCE_SUPPORTED:
1055                 stcb->asoc.peer_supports_ecn_nonce = 0;
1056                 stcb->asoc.ecn_nonce_allowed = 0;
1057                 stcb->asoc.ecn_allowed = 0;
1058                 break;
1059         case SCTP_ADD_IP_ADDRESS:
1060         case SCTP_DEL_IP_ADDRESS:
1061         case SCTP_SET_PRIM_ADDR:
1062                 stcb->asoc.peer_supports_asconf = 0;
1063                 break;
1064         case SCTP_SUCCESS_REPORT:
1065         case SCTP_ERROR_CAUSE_IND:
1066                 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n");
1067                 SCTPDBG(SCTP_DEBUG_INPUT2,
1068                     "Turning off ASCONF to this strange peer\n");
1069                 stcb->asoc.peer_supports_asconf = 0;
1070                 break;
1071         default:
1072                 SCTPDBG(SCTP_DEBUG_INPUT2,
1073                     "Peer does not support param type %d(%x)??\n",
1074                     pbad->param_type, (uint32_t) pbad->param_type);
1075                 break;
1076         }
1077 }
1078
1079 static int
1080 sctp_handle_error(struct sctp_chunkhdr *ch,
1081     struct sctp_tcb *stcb, struct sctp_nets *net)
1082 {
1083         int chklen;
1084         struct sctp_paramhdr *phdr;
1085         uint16_t error_type;
1086         uint16_t error_len;
1087         struct sctp_association *asoc;
1088         int adjust;
1089
1090 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1091         struct socket *so;
1092
1093 #endif
1094
1095         /* parse through all of the errors and process */
1096         asoc = &stcb->asoc;
1097         phdr = (struct sctp_paramhdr *)((caddr_t)ch +
1098             sizeof(struct sctp_chunkhdr));
1099         chklen = ntohs(ch->chunk_length) - sizeof(struct sctp_chunkhdr);
1100         while ((size_t)chklen >= sizeof(struct sctp_paramhdr)) {
1101                 /* Process an Error Cause */
1102                 error_type = ntohs(phdr->param_type);
1103                 error_len = ntohs(phdr->param_length);
1104                 if ((error_len > chklen) || (error_len == 0)) {
1105                         /* invalid param length for this param */
1106                         SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in error param- chunk left:%d errorlen:%d\n",
1107                             chklen, error_len);
1108                         return (0);
1109                 }
1110                 switch (error_type) {
1111                 case SCTP_CAUSE_INVALID_STREAM:
1112                 case SCTP_CAUSE_MISSING_PARAM:
1113                 case SCTP_CAUSE_INVALID_PARAM:
1114                 case SCTP_CAUSE_NO_USER_DATA:
1115                         SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %d back? We have a bug :/ (or do they?)\n",
1116                             error_type);
1117                         break;
1118                 case SCTP_CAUSE_NAT_COLLIDING_STATE:
1119                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n",
1120                             ch->chunk_flags);
1121                         if (sctp_handle_nat_colliding_state(stcb)) {
1122                                 return (0);
1123                         }
1124                         break;
1125                 case SCTP_CAUSE_NAT_MISSING_STATE:
1126                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n",
1127                             ch->chunk_flags);
1128                         if (sctp_handle_nat_missing_state(stcb, net)) {
1129                                 return (0);
1130                         }
1131                         break;
1132                 case SCTP_CAUSE_STALE_COOKIE:
1133                         /*
1134                          * We only act if we have echoed a cookie and are
1135                          * waiting.
1136                          */
1137                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) {
1138                                 int *p;
1139
1140                                 p = (int *)((caddr_t)phdr + sizeof(*phdr));
1141                                 /* Save the time doubled */
1142                                 asoc->cookie_preserve_req = ntohl(*p) << 1;
1143                                 asoc->stale_cookie_count++;
1144                                 if (asoc->stale_cookie_count >
1145                                     asoc->max_init_times) {
1146                                         sctp_abort_notification(stcb, 0, SCTP_SO_NOT_LOCKED);
1147                                         /* now free the asoc */
1148 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1149                                         so = SCTP_INP_SO(stcb->sctp_ep);
1150                                         atomic_add_int(&stcb->asoc.refcnt, 1);
1151                                         SCTP_TCB_UNLOCK(stcb);
1152                                         SCTP_SOCKET_LOCK(so, 1);
1153                                         SCTP_TCB_LOCK(stcb);
1154                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
1155 #endif
1156                                         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1157                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_11);
1158 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1159                                         SCTP_SOCKET_UNLOCK(so, 1);
1160 #endif
1161                                         return (-1);
1162                                 }
1163                                 /* blast back to INIT state */
1164                                 sctp_toss_old_cookies(stcb, &stcb->asoc);
1165                                 asoc->state &= ~SCTP_STATE_COOKIE_ECHOED;
1166                                 asoc->state |= SCTP_STATE_COOKIE_WAIT;
1167                                 sctp_stop_all_cookie_timers(stcb);
1168                                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
1169                         }
1170                         break;
1171                 case SCTP_CAUSE_UNRESOLVABLE_ADDR:
1172                         /*
1173                          * Nothing we can do here, we don't do hostname
1174                          * addresses so if the peer does not like my IPv6
1175                          * (or IPv4 for that matter) it does not matter. If
1176                          * they don't support that type of address, they can
1177                          * NOT possibly get that packet type... i.e. with no
1178                          * IPv6 you can't recieve a IPv6 packet. so we can
1179                          * safely ignore this one. If we ever added support
1180                          * for HOSTNAME Addresses, then we would need to do
1181                          * something here.
1182                          */
1183                         break;
1184                 case SCTP_CAUSE_UNRECOG_CHUNK:
1185                         sctp_process_unrecog_chunk(stcb, phdr, net);
1186                         break;
1187                 case SCTP_CAUSE_UNRECOG_PARAM:
1188                         sctp_process_unrecog_param(stcb, phdr);
1189                         break;
1190                 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN:
1191                         /*
1192                          * We ignore this since the timer will drive out a
1193                          * new cookie anyway and there timer will drive us
1194                          * to send a SHUTDOWN_COMPLETE. We can't send one
1195                          * here since we don't have their tag.
1196                          */
1197                         break;
1198                 case SCTP_CAUSE_DELETING_LAST_ADDR:
1199                 case SCTP_CAUSE_RESOURCE_SHORTAGE:
1200                 case SCTP_CAUSE_DELETING_SRC_ADDR:
1201                         /*
1202                          * We should NOT get these here, but in a
1203                          * ASCONF-ACK.
1204                          */
1205                         SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a Operational Error?<%d>?\n",
1206                             error_type);
1207                         break;
1208                 case SCTP_CAUSE_OUT_OF_RESC:
1209                         /*
1210                          * And what, pray tell do we do with the fact that
1211                          * the peer is out of resources? Not really sure we
1212                          * could do anything but abort. I suspect this
1213                          * should have came WITH an abort instead of in a
1214                          * OP-ERROR.
1215                          */
1216                         break;
1217                 default:
1218                         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown error type = 0x%xh\n",
1219                             error_type);
1220                         break;
1221                 }
1222                 adjust = SCTP_SIZE32(error_len);
1223                 chklen -= adjust;
1224                 phdr = (struct sctp_paramhdr *)((caddr_t)phdr + adjust);
1225         }
1226         return (0);
1227 }
1228
1229 static int
1230 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset,
1231     struct sctphdr *sh, struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
1232     struct sctp_nets *net, int *abort_no_unlock, uint32_t vrf_id)
1233 {
1234         struct sctp_init_ack *init_ack;
1235         struct mbuf *op_err;
1236
1237         SCTPDBG(SCTP_DEBUG_INPUT2,
1238             "sctp_handle_init_ack: handling INIT-ACK\n");
1239
1240         if (stcb == NULL) {
1241                 SCTPDBG(SCTP_DEBUG_INPUT2,
1242                     "sctp_handle_init_ack: TCB is null\n");
1243                 return (-1);
1244         }
1245         if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) {
1246                 /* Invalid length */
1247                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
1248                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh,
1249                     op_err, 0, net->port);
1250                 *abort_no_unlock = 1;
1251                 return (-1);
1252         }
1253         init_ack = &cp->init;
1254         /* validate parameters */
1255         if (init_ack->initiate_tag == 0) {
1256                 /* protocol error... send an abort */
1257                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
1258                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh,
1259                     op_err, 0, net->port);
1260                 *abort_no_unlock = 1;
1261                 return (-1);
1262         }
1263         if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) {
1264                 /* protocol error... send an abort */
1265                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
1266                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh,
1267                     op_err, 0, net->port);
1268                 *abort_no_unlock = 1;
1269                 return (-1);
1270         }
1271         if (init_ack->num_inbound_streams == 0) {
1272                 /* protocol error... send an abort */
1273                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
1274                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh,
1275                     op_err, 0, net->port);
1276                 *abort_no_unlock = 1;
1277                 return (-1);
1278         }
1279         if (init_ack->num_outbound_streams == 0) {
1280                 /* protocol error... send an abort */
1281                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
1282                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh,
1283                     op_err, 0, net->port);
1284                 *abort_no_unlock = 1;
1285                 return (-1);
1286         }
1287         /* process according to association state... */
1288         switch (stcb->asoc.state & SCTP_STATE_MASK) {
1289         case SCTP_STATE_COOKIE_WAIT:
1290                 /* this is the expected state for this chunk */
1291                 /* process the INIT-ACK parameters */
1292                 if (stcb->asoc.primary_destination->dest_state &
1293                     SCTP_ADDR_UNCONFIRMED) {
1294                         /*
1295                          * The primary is where we sent the INIT, we can
1296                          * always consider it confirmed when the INIT-ACK is
1297                          * returned. Do this before we load addresses
1298                          * though.
1299                          */
1300                         stcb->asoc.primary_destination->dest_state &=
1301                             ~SCTP_ADDR_UNCONFIRMED;
1302                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
1303                             stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED);
1304                 }
1305                 if (sctp_process_init_ack(m, iphlen, offset, sh, cp, stcb,
1306                     net, abort_no_unlock, vrf_id) < 0) {
1307                         /* error in parsing parameters */
1308                         return (-1);
1309                 }
1310                 /* update our state */
1311                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n");
1312                 SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_ECHOED);
1313
1314                 /* reset the RTO calc */
1315                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
1316                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
1317                             stcb->asoc.overall_error_count,
1318                             0,
1319                             SCTP_FROM_SCTP_INPUT,
1320                             __LINE__);
1321                 }
1322                 stcb->asoc.overall_error_count = 0;
1323                 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
1324                 /*
1325                  * collapse the init timer back in case of a exponential
1326                  * backoff
1327                  */
1328                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep,
1329                     stcb, net);
1330                 /*
1331                  * the send at the end of the inbound data processing will
1332                  * cause the cookie to be sent
1333                  */
1334                 break;
1335         case SCTP_STATE_SHUTDOWN_SENT:
1336                 /* incorrect state... discard */
1337                 break;
1338         case SCTP_STATE_COOKIE_ECHOED:
1339                 /* incorrect state... discard */
1340                 break;
1341         case SCTP_STATE_OPEN:
1342                 /* incorrect state... discard */
1343                 break;
1344         case SCTP_STATE_EMPTY:
1345         case SCTP_STATE_INUSE:
1346         default:
1347                 /* incorrect state... discard */
1348                 return (-1);
1349                 break;
1350         }
1351         SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n");
1352         return (0);
1353 }
1354
1355 static struct sctp_tcb *
1356 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
1357     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1358     struct sctp_inpcb *inp, struct sctp_nets **netp,
1359     struct sockaddr *init_src, int *notification,
1360     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1361     uint32_t vrf_id, uint16_t port);
1362
1363
1364 /*
1365  * handle a state cookie for an existing association m: input packet mbuf
1366  * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a
1367  * "split" mbuf and the cookie signature does not exist offset: offset into
1368  * mbuf to the cookie-echo chunk
1369  */
1370 static struct sctp_tcb *
1371 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset,
1372     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1373     struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp,
1374     struct sockaddr *init_src, int *notification, sctp_assoc_t * sac_assoc_id,
1375     uint32_t vrf_id, int auth_skipped, uint32_t auth_offset, uint32_t auth_len, uint16_t port)
1376 {
1377         struct sctp_association *asoc;
1378         struct sctp_init_chunk *init_cp, init_buf;
1379         struct sctp_init_ack_chunk *initack_cp, initack_buf;
1380         struct sctp_nets *net;
1381         struct mbuf *op_err;
1382         struct sctp_paramhdr *ph;
1383         int chk_length;
1384         int init_offset, initack_offset, i;
1385         int retval;
1386         int spec_flag = 0;
1387         uint32_t how_indx;
1388
1389         net = *netp;
1390         /* I know that the TCB is non-NULL from the caller */
1391         asoc = &stcb->asoc;
1392         for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) {
1393                 if (asoc->cookie_how[how_indx] == 0)
1394                         break;
1395         }
1396         if (how_indx < sizeof(asoc->cookie_how)) {
1397                 asoc->cookie_how[how_indx] = 1;
1398         }
1399         if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
1400                 /* SHUTDOWN came in after sending INIT-ACK */
1401                 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination);
1402                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
1403                     0, M_DONTWAIT, 1, MT_DATA);
1404                 if (op_err == NULL) {
1405                         /* FOOBAR */
1406                         return (NULL);
1407                 }
1408                 /* Set the len */
1409                 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_paramhdr);
1410                 ph = mtod(op_err, struct sctp_paramhdr *);
1411                 ph->param_type = htons(SCTP_CAUSE_COOKIE_IN_SHUTDOWN);
1412                 ph->param_length = htons(sizeof(struct sctp_paramhdr));
1413                 sctp_send_operr_to(m, iphlen, op_err, cookie->peers_vtag,
1414                     vrf_id, net->port);
1415                 if (how_indx < sizeof(asoc->cookie_how))
1416                         asoc->cookie_how[how_indx] = 2;
1417                 return (NULL);
1418         }
1419         /*
1420          * find and validate the INIT chunk in the cookie (peer's info) the
1421          * INIT should start after the cookie-echo header struct (chunk
1422          * header, state cookie header struct)
1423          */
1424         init_offset = offset += sizeof(struct sctp_cookie_echo_chunk);
1425
1426         init_cp = (struct sctp_init_chunk *)
1427             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
1428             (uint8_t *) & init_buf);
1429         if (init_cp == NULL) {
1430                 /* could not pull a INIT chunk in cookie */
1431                 return (NULL);
1432         }
1433         chk_length = ntohs(init_cp->ch.chunk_length);
1434         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
1435                 return (NULL);
1436         }
1437         /*
1438          * find and validate the INIT-ACK chunk in the cookie (my info) the
1439          * INIT-ACK follows the INIT chunk
1440          */
1441         initack_offset = init_offset + SCTP_SIZE32(chk_length);
1442         initack_cp = (struct sctp_init_ack_chunk *)
1443             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
1444             (uint8_t *) & initack_buf);
1445         if (initack_cp == NULL) {
1446                 /* could not pull INIT-ACK chunk in cookie */
1447                 return (NULL);
1448         }
1449         chk_length = ntohs(initack_cp->ch.chunk_length);
1450         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
1451                 return (NULL);
1452         }
1453         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1454             (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) {
1455                 /*
1456                  * case D in Section 5.2.4 Table 2: MMAA process accordingly
1457                  * to get into the OPEN state
1458                  */
1459                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1460                         /*-
1461                          * Opps, this means that we somehow generated two vtag's
1462                          * the same. I.e. we did:
1463                          *  Us               Peer
1464                          *   <---INIT(tag=a)------
1465                          *   ----INIT-ACK(tag=t)-->
1466                          *   ----INIT(tag=t)------> *1
1467                          *   <---INIT-ACK(tag=a)---
1468                          *   <----CE(tag=t)------------- *2
1469                          *
1470                          * At point *1 we should be generating a different
1471                          * tag t'. Which means we would throw away the CE and send
1472                          * ours instead. Basically this is case C (throw away side).
1473                          */
1474                         if (how_indx < sizeof(asoc->cookie_how))
1475                                 asoc->cookie_how[how_indx] = 17;
1476                         return (NULL);
1477
1478                 }
1479                 switch SCTP_GET_STATE
1480                         (asoc) {
1481                 case SCTP_STATE_COOKIE_WAIT:
1482                 case SCTP_STATE_COOKIE_ECHOED:
1483                         /*
1484                          * INIT was sent but got a COOKIE_ECHO with the
1485                          * correct tags... just accept it...but we must
1486                          * process the init so that we can make sure we have
1487                          * the right seq no's.
1488                          */
1489                         /* First we must process the INIT !! */
1490                         retval = sctp_process_init(init_cp, stcb, net);
1491                         if (retval < 0) {
1492                                 if (how_indx < sizeof(asoc->cookie_how))
1493                                         asoc->cookie_how[how_indx] = 3;
1494                                 return (NULL);
1495                         }
1496                         /* we have already processed the INIT so no problem */
1497                         sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb,
1498                             net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_12);
1499                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_13);
1500                         /* update current state */
1501                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)
1502                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1503                         else
1504                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1505
1506                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1507                         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1508                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1509                                     stcb->sctp_ep, stcb, asoc->primary_destination);
1510                         }
1511                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1512                         sctp_stop_all_cookie_timers(stcb);
1513                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1514                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1515                             (inp->sctp_socket->so_qlimit == 0)
1516                             ) {
1517 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1518                                 struct socket *so;
1519
1520 #endif
1521                                 /*
1522                                  * Here is where collision would go if we
1523                                  * did a connect() and instead got a
1524                                  * init/init-ack/cookie done before the
1525                                  * init-ack came back..
1526                                  */
1527                                 stcb->sctp_ep->sctp_flags |=
1528                                     SCTP_PCB_FLAGS_CONNECTED;
1529 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1530                                 so = SCTP_INP_SO(stcb->sctp_ep);
1531                                 atomic_add_int(&stcb->asoc.refcnt, 1);
1532                                 SCTP_TCB_UNLOCK(stcb);
1533                                 SCTP_SOCKET_LOCK(so, 1);
1534                                 SCTP_TCB_LOCK(stcb);
1535                                 atomic_add_int(&stcb->asoc.refcnt, -1);
1536                                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1537                                         SCTP_SOCKET_UNLOCK(so, 1);
1538                                         return (NULL);
1539                                 }
1540 #endif
1541                                 soisconnected(stcb->sctp_socket);
1542 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1543                                 SCTP_SOCKET_UNLOCK(so, 1);
1544 #endif
1545                         }
1546                         /* notify upper layer */
1547                         *notification = SCTP_NOTIFY_ASSOC_UP;
1548                         /*
1549                          * since we did not send a HB make sure we don't
1550                          * double things
1551                          */
1552                         net->hb_responded = 1;
1553                         net->RTO = sctp_calculate_rto(stcb, asoc, net,
1554                             &cookie->time_entered, sctp_align_unsafe_makecopy);
1555
1556                         if (stcb->asoc.sctp_autoclose_ticks &&
1557                             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) {
1558                                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
1559                                     inp, stcb, NULL);
1560                         }
1561                         break;
1562                 default:
1563                         /*
1564                          * we're in the OPEN state (or beyond), so peer must
1565                          * have simply lost the COOKIE-ACK
1566                          */
1567                         break;
1568                         }       /* end switch */
1569                 sctp_stop_all_cookie_timers(stcb);
1570                 /*
1571                  * We ignore the return code here.. not sure if we should
1572                  * somehow abort.. but we do have an existing asoc. This
1573                  * really should not fail.
1574                  */
1575                 if (sctp_load_addresses_from_init(stcb, m, iphlen,
1576                     init_offset + sizeof(struct sctp_init_chunk),
1577                     initack_offset, sh, init_src)) {
1578                         if (how_indx < sizeof(asoc->cookie_how))
1579                                 asoc->cookie_how[how_indx] = 4;
1580                         return (NULL);
1581                 }
1582                 /* respond with a COOKIE-ACK */
1583                 sctp_toss_old_cookies(stcb, asoc);
1584                 sctp_send_cookie_ack(stcb);
1585                 if (how_indx < sizeof(asoc->cookie_how))
1586                         asoc->cookie_how[how_indx] = 5;
1587                 return (stcb);
1588         }
1589         if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1590             ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag &&
1591             cookie->tie_tag_my_vtag == 0 &&
1592             cookie->tie_tag_peer_vtag == 0) {
1593                 /*
1594                  * case C in Section 5.2.4 Table 2: XMOO silently discard
1595                  */
1596                 if (how_indx < sizeof(asoc->cookie_how))
1597                         asoc->cookie_how[how_indx] = 6;
1598                 return (NULL);
1599         }
1600         /*
1601          * If nat support, and the below and stcb is established, send back
1602          * a ABORT(colliding state) if we are established.
1603          */
1604         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) &&
1605             (asoc->peer_supports_nat) &&
1606             ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1607             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1608             (asoc->peer_vtag == 0)))) {
1609                 /*
1610                  * Special case - Peer's support nat. We may have two init's
1611                  * that we gave out the same tag on since one was not
1612                  * established.. i.e. we get INIT from host-1 behind the nat
1613                  * and we respond tag-a, we get a INIT from host-2 behind
1614                  * the nat and we get tag-a again. Then we bring up host-1
1615                  * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1).
1616                  * Now we have colliding state. We must send an abort here
1617                  * with colliding state indication.
1618                  */
1619                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
1620                     0, M_DONTWAIT, 1, MT_DATA);
1621                 if (op_err == NULL) {
1622                         /* FOOBAR */
1623                         return (NULL);
1624                 }
1625                 /* pre-reserve some space */
1626 #ifdef INET6
1627                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
1628 #else
1629                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
1630 #endif
1631                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
1632                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
1633                 /* Set the len */
1634                 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_paramhdr);
1635                 ph = mtod(op_err, struct sctp_paramhdr *);
1636                 ph->param_type = htons(SCTP_CAUSE_NAT_COLLIDING_STATE);
1637                 ph->param_length = htons(sizeof(struct sctp_paramhdr));
1638                 sctp_send_abort(m, iphlen, sh, 0, op_err, vrf_id, port);
1639                 return (NULL);
1640         }
1641         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1642             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1643             (asoc->peer_vtag == 0))) {
1644                 /*
1645                  * case B in Section 5.2.4 Table 2: MXAA or MOAA my info
1646                  * should be ok, re-accept peer info
1647                  */
1648                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1649                         /*
1650                          * Extension of case C. If we hit this, then the
1651                          * random number generator returned the same vtag
1652                          * when we first sent our INIT-ACK and when we later
1653                          * sent our INIT. The side with the seq numbers that
1654                          * are different will be the one that normnally
1655                          * would have hit case C. This in effect "extends"
1656                          * our vtags in this collision case to be 64 bits.
1657                          * The same collision could occur aka you get both
1658                          * vtag and seq number the same twice in a row.. but
1659                          * is much less likely. If it did happen then we
1660                          * would proceed through and bring up the assoc.. we
1661                          * may end up with the wrong stream setup however..
1662                          * which would be bad.. but there is no way to
1663                          * tell.. until we send on a stream that does not
1664                          * exist :-)
1665                          */
1666                         if (how_indx < sizeof(asoc->cookie_how))
1667                                 asoc->cookie_how[how_indx] = 7;
1668
1669                         return (NULL);
1670                 }
1671                 if (how_indx < sizeof(asoc->cookie_how))
1672                         asoc->cookie_how[how_indx] = 8;
1673                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_14);
1674                 sctp_stop_all_cookie_timers(stcb);
1675                 /*
1676                  * since we did not send a HB make sure we don't double
1677                  * things
1678                  */
1679                 net->hb_responded = 1;
1680                 if (stcb->asoc.sctp_autoclose_ticks &&
1681                     sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
1682                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb,
1683                             NULL);
1684                 }
1685                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1686                 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
1687
1688                 /* Note last_cwr_tsn? where is this used? */
1689                 asoc->last_cwr_tsn = asoc->init_seq_number - 1;
1690                 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) {
1691                         /*
1692                          * Ok the peer probably discarded our data (if we
1693                          * echoed a cookie+data). So anything on the
1694                          * sent_queue should be marked for retransmit, we
1695                          * may not get something to kick us so it COULD
1696                          * still take a timeout to move these.. but it can't
1697                          * hurt to mark them.
1698                          */
1699                         struct sctp_tmit_chunk *chk;
1700
1701                         TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
1702                                 if (chk->sent < SCTP_DATAGRAM_RESEND) {
1703                                         chk->sent = SCTP_DATAGRAM_RESEND;
1704                                         sctp_flight_size_decrease(chk);
1705                                         sctp_total_flight_decrease(stcb, chk);
1706                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1707                                         spec_flag++;
1708                                 }
1709                         }
1710
1711                 }
1712                 /* process the INIT info (peer's info) */
1713                 retval = sctp_process_init(init_cp, stcb, net);
1714                 if (retval < 0) {
1715                         if (how_indx < sizeof(asoc->cookie_how))
1716                                 asoc->cookie_how[how_indx] = 9;
1717                         return (NULL);
1718                 }
1719                 if (sctp_load_addresses_from_init(stcb, m, iphlen,
1720                     init_offset + sizeof(struct sctp_init_chunk),
1721                     initack_offset, sh, init_src)) {
1722                         if (how_indx < sizeof(asoc->cookie_how))
1723                                 asoc->cookie_how[how_indx] = 10;
1724                         return (NULL);
1725                 }
1726                 if ((asoc->state & SCTP_STATE_COOKIE_WAIT) ||
1727                     (asoc->state & SCTP_STATE_COOKIE_ECHOED)) {
1728                         *notification = SCTP_NOTIFY_ASSOC_UP;
1729
1730                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1731                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1732                             (inp->sctp_socket->so_qlimit == 0)) {
1733 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1734                                 struct socket *so;
1735
1736 #endif
1737                                 stcb->sctp_ep->sctp_flags |=
1738                                     SCTP_PCB_FLAGS_CONNECTED;
1739 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1740                                 so = SCTP_INP_SO(stcb->sctp_ep);
1741                                 atomic_add_int(&stcb->asoc.refcnt, 1);
1742                                 SCTP_TCB_UNLOCK(stcb);
1743                                 SCTP_SOCKET_LOCK(so, 1);
1744                                 SCTP_TCB_LOCK(stcb);
1745                                 atomic_add_int(&stcb->asoc.refcnt, -1);
1746                                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1747                                         SCTP_SOCKET_UNLOCK(so, 1);
1748                                         return (NULL);
1749                                 }
1750 #endif
1751                                 soisconnected(stcb->sctp_socket);
1752 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1753                                 SCTP_SOCKET_UNLOCK(so, 1);
1754 #endif
1755                         }
1756                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)
1757                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1758                         else
1759                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1760                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1761                 } else if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
1762                         SCTP_STAT_INCR_COUNTER32(sctps_restartestab);
1763                 } else {
1764                         SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1765                 }
1766                 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1767                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1768                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1769                             stcb->sctp_ep, stcb, asoc->primary_destination);
1770                 }
1771                 sctp_stop_all_cookie_timers(stcb);
1772                 sctp_toss_old_cookies(stcb, asoc);
1773                 sctp_send_cookie_ack(stcb);
1774                 if (spec_flag) {
1775                         /*
1776                          * only if we have retrans set do we do this. What
1777                          * this call does is get only the COOKIE-ACK out and
1778                          * then when we return the normal call to
1779                          * sctp_chunk_output will get the retrans out behind
1780                          * this.
1781                          */
1782                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED);
1783                 }
1784                 if (how_indx < sizeof(asoc->cookie_how))
1785                         asoc->cookie_how[how_indx] = 11;
1786
1787                 return (stcb);
1788         }
1789         if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1790             ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) &&
1791             cookie->tie_tag_my_vtag == asoc->my_vtag_nonce &&
1792             cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce &&
1793             cookie->tie_tag_peer_vtag != 0) {
1794                 struct sctpasochead *head;
1795
1796                 if (asoc->peer_supports_nat) {
1797                         /*
1798                          * This is a gross gross hack. just call the
1799                          * cookie_new code since we are allowing a duplicate
1800                          * association. I hope this works...
1801                          */
1802                         return (sctp_process_cookie_new(m, iphlen, offset, sh, cookie, cookie_len,
1803                             inp, netp, init_src, notification,
1804                             auth_skipped, auth_offset, auth_len,
1805                             vrf_id, port));
1806                 }
1807                 /*
1808                  * case A in Section 5.2.4 Table 2: XXMM (peer restarted)
1809                  */
1810                 /* temp code */
1811                 if (how_indx < sizeof(asoc->cookie_how))
1812                         asoc->cookie_how[how_indx] = 12;
1813                 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_15);
1814                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
1815
1816                 *sac_assoc_id = sctp_get_associd(stcb);
1817                 /* notify upper layer */
1818                 *notification = SCTP_NOTIFY_ASSOC_RESTART;
1819                 atomic_add_int(&stcb->asoc.refcnt, 1);
1820                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_OPEN) &&
1821                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
1822                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) {
1823                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1824                 }
1825                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
1826                         SCTP_STAT_INCR_GAUGE32(sctps_restartestab);
1827                 } else if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) {
1828                         SCTP_STAT_INCR_GAUGE32(sctps_collisionestab);
1829                 }
1830                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1831                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1832                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1833                             stcb->sctp_ep, stcb, asoc->primary_destination);
1834
1835                 } else if (!(asoc->state & SCTP_STATE_SHUTDOWN_SENT)) {
1836                         /* move to OPEN state, if not in SHUTDOWN_SENT */
1837                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1838                 }
1839                 asoc->pre_open_streams =
1840                     ntohs(initack_cp->init.num_outbound_streams);
1841                 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
1842                 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
1843                 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
1844
1845                 asoc->last_cwr_tsn = asoc->init_seq_number - 1;
1846                 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
1847
1848                 asoc->str_reset_seq_in = asoc->init_seq_number;
1849
1850                 asoc->advanced_peer_ack_point = asoc->last_acked_seq;
1851                 if (asoc->mapping_array) {
1852                         memset(asoc->mapping_array, 0,
1853                             asoc->mapping_array_size);
1854                 }
1855                 /* EY 05/13/08 - nr_sack version of the above if statement */
1856                 if (asoc->nr_mapping_array && SCTP_BASE_SYSCTL(sctp_nr_sack_on_off)
1857                     && asoc->peer_supports_nr_sack) {
1858                         memset(asoc->nr_mapping_array, 0,
1859                             asoc->nr_mapping_array_size);
1860                 }
1861                 SCTP_TCB_UNLOCK(stcb);
1862                 SCTP_INP_INFO_WLOCK();
1863                 SCTP_INP_WLOCK(stcb->sctp_ep);
1864                 SCTP_TCB_LOCK(stcb);
1865                 atomic_add_int(&stcb->asoc.refcnt, -1);
1866                 /* send up all the data */
1867                 SCTP_TCB_SEND_LOCK(stcb);
1868
1869                 sctp_report_all_outbound(stcb, 1, SCTP_SO_NOT_LOCKED);
1870                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
1871                         stcb->asoc.strmout[i].stream_no = i;
1872                         stcb->asoc.strmout[i].next_sequence_sent = 0;
1873                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
1874                 }
1875                 /* process the INIT-ACK info (my info) */
1876                 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
1877                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1878
1879                 /* pull from vtag hash */
1880                 LIST_REMOVE(stcb, sctp_asocs);
1881                 /* re-insert to new vtag position */
1882                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag,
1883                     SCTP_BASE_INFO(hashasocmark))];
1884                 /*
1885                  * put it in the bucket in the vtag hash of assoc's for the
1886                  * system
1887                  */
1888                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
1889
1890                 /* process the INIT info (peer's info) */
1891                 SCTP_TCB_SEND_UNLOCK(stcb);
1892                 SCTP_INP_WUNLOCK(stcb->sctp_ep);
1893                 SCTP_INP_INFO_WUNLOCK();
1894
1895                 retval = sctp_process_init(init_cp, stcb, net);
1896                 if (retval < 0) {
1897                         if (how_indx < sizeof(asoc->cookie_how))
1898                                 asoc->cookie_how[how_indx] = 13;
1899
1900                         return (NULL);
1901                 }
1902                 /*
1903                  * since we did not send a HB make sure we don't double
1904                  * things
1905                  */
1906                 net->hb_responded = 1;
1907
1908                 if (sctp_load_addresses_from_init(stcb, m, iphlen,
1909                     init_offset + sizeof(struct sctp_init_chunk),
1910                     initack_offset, sh, init_src)) {
1911                         if (how_indx < sizeof(asoc->cookie_how))
1912                                 asoc->cookie_how[how_indx] = 14;
1913
1914                         return (NULL);
1915                 }
1916                 /* respond with a COOKIE-ACK */
1917                 sctp_stop_all_cookie_timers(stcb);
1918                 sctp_toss_old_cookies(stcb, asoc);
1919                 sctp_send_cookie_ack(stcb);
1920                 if (how_indx < sizeof(asoc->cookie_how))
1921                         asoc->cookie_how[how_indx] = 15;
1922
1923                 return (stcb);
1924         }
1925         if (how_indx < sizeof(asoc->cookie_how))
1926                 asoc->cookie_how[how_indx] = 16;
1927         /* all other cases... */
1928         return (NULL);
1929 }
1930
1931
1932 /*
1933  * handle a state cookie for a new association m: input packet mbuf chain--
1934  * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf
1935  * and the cookie signature does not exist offset: offset into mbuf to the
1936  * cookie-echo chunk length: length of the cookie chunk to: where the init
1937  * was from returns a new TCB
1938  */
1939 struct sctp_tcb *
1940 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
1941     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1942     struct sctp_inpcb *inp, struct sctp_nets **netp,
1943     struct sockaddr *init_src, int *notification,
1944     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1945     uint32_t vrf_id, uint16_t port)
1946 {
1947         struct sctp_tcb *stcb;
1948         struct sctp_init_chunk *init_cp, init_buf;
1949         struct sctp_init_ack_chunk *initack_cp, initack_buf;
1950         struct sockaddr_storage sa_store;
1951         struct sockaddr *initack_src = (struct sockaddr *)&sa_store;
1952         struct sockaddr_in *sin;
1953         struct sockaddr_in6 *sin6;
1954         struct sctp_association *asoc;
1955         int chk_length;
1956         int init_offset, initack_offset, initack_limit;
1957         int retval;
1958         int error = 0;
1959         uint32_t old_tag;
1960         uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE];
1961
1962 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1963         struct socket *so;
1964
1965         so = SCTP_INP_SO(inp);
1966 #endif
1967
1968         /*
1969          * find and validate the INIT chunk in the cookie (peer's info) the
1970          * INIT should start after the cookie-echo header struct (chunk
1971          * header, state cookie header struct)
1972          */
1973         init_offset = offset + sizeof(struct sctp_cookie_echo_chunk);
1974         init_cp = (struct sctp_init_chunk *)
1975             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
1976             (uint8_t *) & init_buf);
1977         if (init_cp == NULL) {
1978                 /* could not pull a INIT chunk in cookie */
1979                 SCTPDBG(SCTP_DEBUG_INPUT1,
1980                     "process_cookie_new: could not pull INIT chunk hdr\n");
1981                 return (NULL);
1982         }
1983         chk_length = ntohs(init_cp->ch.chunk_length);
1984         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
1985                 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n");
1986                 return (NULL);
1987         }
1988         initack_offset = init_offset + SCTP_SIZE32(chk_length);
1989         /*
1990          * find and validate the INIT-ACK chunk in the cookie (my info) the
1991          * INIT-ACK follows the INIT chunk
1992          */
1993         initack_cp = (struct sctp_init_ack_chunk *)
1994             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
1995             (uint8_t *) & initack_buf);
1996         if (initack_cp == NULL) {
1997                 /* could not pull INIT-ACK chunk in cookie */
1998                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n");
1999                 return (NULL);
2000         }
2001         chk_length = ntohs(initack_cp->ch.chunk_length);
2002         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
2003                 return (NULL);
2004         }
2005         /*
2006          * NOTE: We can't use the INIT_ACK's chk_length to determine the
2007          * "initack_limit" value.  This is because the chk_length field
2008          * includes the length of the cookie, but the cookie is omitted when
2009          * the INIT and INIT_ACK are tacked onto the cookie...
2010          */
2011         initack_limit = offset + cookie_len;
2012
2013         /*
2014          * now that we know the INIT/INIT-ACK are in place, create a new TCB
2015          * and popluate
2016          */
2017
2018         /*
2019          * Here we do a trick, we set in NULL for the proc/thread argument.
2020          * We do this since in effect we only use the p argument when the
2021          * socket is unbound and we must do an implicit bind. Since we are
2022          * getting a cookie, we cannot be unbound.
2023          */
2024         stcb = sctp_aloc_assoc(inp, init_src, 0, &error,
2025             ntohl(initack_cp->init.initiate_tag), vrf_id,
2026             (struct thread *)NULL
2027             );
2028         if (stcb == NULL) {
2029                 struct mbuf *op_err;
2030
2031                 /* memory problem? */
2032                 SCTPDBG(SCTP_DEBUG_INPUT1,
2033                     "process_cookie_new: no room for another TCB!\n");
2034                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC);
2035
2036                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2037                     sh, op_err, vrf_id, port);
2038                 return (NULL);
2039         }
2040         /* get the correct sctp_nets */
2041         if (netp)
2042                 *netp = sctp_findnet(stcb, init_src);
2043
2044         asoc = &stcb->asoc;
2045         /* get scope variables out of cookie */
2046         asoc->ipv4_local_scope = cookie->ipv4_scope;
2047         asoc->site_scope = cookie->site_scope;
2048         asoc->local_scope = cookie->local_scope;
2049         asoc->loopback_scope = cookie->loopback_scope;
2050
2051         if ((asoc->ipv4_addr_legal != cookie->ipv4_addr_legal) ||
2052             (asoc->ipv6_addr_legal != cookie->ipv6_addr_legal)) {
2053                 struct mbuf *op_err;
2054
2055                 /*
2056                  * Houston we have a problem. The EP changed while the
2057                  * cookie was in flight. Only recourse is to abort the
2058                  * association.
2059                  */
2060                 atomic_add_int(&stcb->asoc.refcnt, 1);
2061                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC);
2062                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2063                     sh, op_err, vrf_id, port);
2064 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2065                 SCTP_TCB_UNLOCK(stcb);
2066                 SCTP_SOCKET_LOCK(so, 1);
2067                 SCTP_TCB_LOCK(stcb);
2068 #endif
2069                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2070                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
2071 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2072                 SCTP_SOCKET_UNLOCK(so, 1);
2073 #endif
2074                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2075                 return (NULL);
2076         }
2077         /* process the INIT-ACK info (my info) */
2078         old_tag = asoc->my_vtag;
2079         asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
2080         asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
2081         asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
2082         asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
2083         asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
2084         asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
2085         asoc->last_cwr_tsn = asoc->init_seq_number - 1;
2086         asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
2087         asoc->str_reset_seq_in = asoc->init_seq_number;
2088
2089         asoc->advanced_peer_ack_point = asoc->last_acked_seq;
2090
2091         /* process the INIT info (peer's info) */
2092         if (netp)
2093                 retval = sctp_process_init(init_cp, stcb, *netp);
2094         else
2095                 retval = 0;
2096         if (retval < 0) {
2097                 atomic_add_int(&stcb->asoc.refcnt, 1);
2098 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2099                 SCTP_TCB_UNLOCK(stcb);
2100                 SCTP_SOCKET_LOCK(so, 1);
2101                 SCTP_TCB_LOCK(stcb);
2102 #endif
2103                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
2104 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2105                 SCTP_SOCKET_UNLOCK(so, 1);
2106 #endif
2107                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2108                 return (NULL);
2109         }
2110         /* load all addresses */
2111         if (sctp_load_addresses_from_init(stcb, m, iphlen,
2112             init_offset + sizeof(struct sctp_init_chunk), initack_offset, sh,
2113             init_src)) {
2114                 atomic_add_int(&stcb->asoc.refcnt, 1);
2115 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2116                 SCTP_TCB_UNLOCK(stcb);
2117                 SCTP_SOCKET_LOCK(so, 1);
2118                 SCTP_TCB_LOCK(stcb);
2119 #endif
2120                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_17);
2121 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2122                 SCTP_SOCKET_UNLOCK(so, 1);
2123 #endif
2124                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2125                 return (NULL);
2126         }
2127         /*
2128          * verify any preceding AUTH chunk that was skipped
2129          */
2130         /* pull the local authentication parameters from the cookie/init-ack */
2131         sctp_auth_get_cookie_params(stcb, m,
2132             initack_offset + sizeof(struct sctp_init_ack_chunk),
2133             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)));
2134         if (auth_skipped) {
2135                 struct sctp_auth_chunk *auth;
2136
2137                 auth = (struct sctp_auth_chunk *)
2138                     sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf);
2139                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) {
2140                         /* auth HMAC failed, dump the assoc and packet */
2141                         SCTPDBG(SCTP_DEBUG_AUTH1,
2142                             "COOKIE-ECHO: AUTH failed\n");
2143                         atomic_add_int(&stcb->asoc.refcnt, 1);
2144 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2145                         SCTP_TCB_UNLOCK(stcb);
2146                         SCTP_SOCKET_LOCK(so, 1);
2147                         SCTP_TCB_LOCK(stcb);
2148 #endif
2149                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_18);
2150 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2151                         SCTP_SOCKET_UNLOCK(so, 1);
2152 #endif
2153                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
2154                         return (NULL);
2155                 } else {
2156                         /* remaining chunks checked... good to go */
2157                         stcb->asoc.authenticated = 1;
2158                 }
2159         }
2160         /* update current state */
2161         SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2162         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
2163         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2164                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2165                     stcb->sctp_ep, stcb, asoc->primary_destination);
2166         }
2167         sctp_stop_all_cookie_timers(stcb);
2168         SCTP_STAT_INCR_COUNTER32(sctps_passiveestab);
2169         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2170
2171         /*
2172          * if we're doing ASCONFs, check to see if we have any new local
2173          * addresses that need to get added to the peer (eg. addresses
2174          * changed while cookie echo in flight).  This needs to be done
2175          * after we go to the OPEN state to do the correct asconf
2176          * processing. else, make sure we have the correct addresses in our
2177          * lists
2178          */
2179
2180         /* warning, we re-use sin, sin6, sa_store here! */
2181         /* pull in local_address (our "from" address) */
2182         if (cookie->laddr_type == SCTP_IPV4_ADDRESS) {
2183                 /* source addr is IPv4 */
2184                 sin = (struct sockaddr_in *)initack_src;
2185                 memset(sin, 0, sizeof(*sin));
2186                 sin->sin_family = AF_INET;
2187                 sin->sin_len = sizeof(struct sockaddr_in);
2188                 sin->sin_addr.s_addr = cookie->laddress[0];
2189         } else if (cookie->laddr_type == SCTP_IPV6_ADDRESS) {
2190                 /* source addr is IPv6 */
2191                 sin6 = (struct sockaddr_in6 *)initack_src;
2192                 memset(sin6, 0, sizeof(*sin6));
2193                 sin6->sin6_family = AF_INET6;
2194                 sin6->sin6_len = sizeof(struct sockaddr_in6);
2195                 sin6->sin6_scope_id = cookie->scope_id;
2196                 memcpy(&sin6->sin6_addr, cookie->laddress,
2197                     sizeof(sin6->sin6_addr));
2198         } else {
2199                 atomic_add_int(&stcb->asoc.refcnt, 1);
2200 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2201                 SCTP_TCB_UNLOCK(stcb);
2202                 SCTP_SOCKET_LOCK(so, 1);
2203                 SCTP_TCB_LOCK(stcb);
2204 #endif
2205                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_19);
2206 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2207                 SCTP_SOCKET_UNLOCK(so, 1);
2208 #endif
2209                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2210                 return (NULL);
2211         }
2212
2213         /* set up to notify upper layer */
2214         *notification = SCTP_NOTIFY_ASSOC_UP;
2215         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2216             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
2217             (inp->sctp_socket->so_qlimit == 0)) {
2218                 /*
2219                  * This is an endpoint that called connect() how it got a
2220                  * cookie that is NEW is a bit of a mystery. It must be that
2221                  * the INIT was sent, but before it got there.. a complete
2222                  * INIT/INIT-ACK/COOKIE arrived. But of course then it
2223                  * should have went to the other code.. not here.. oh well..
2224                  * a bit of protection is worth having..
2225                  */
2226                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2227 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2228                 atomic_add_int(&stcb->asoc.refcnt, 1);
2229                 SCTP_TCB_UNLOCK(stcb);
2230                 SCTP_SOCKET_LOCK(so, 1);
2231                 SCTP_TCB_LOCK(stcb);
2232                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2233                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
2234                         SCTP_SOCKET_UNLOCK(so, 1);
2235                         return (NULL);
2236                 }
2237 #endif
2238                 soisconnected(stcb->sctp_socket);
2239 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2240                 SCTP_SOCKET_UNLOCK(so, 1);
2241 #endif
2242         } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
2243             (inp->sctp_socket->so_qlimit)) {
2244                 /*
2245                  * We don't want to do anything with this one. Since it is
2246                  * the listening guy. The timer will get started for
2247                  * accepted connections in the caller.
2248                  */
2249                 ;
2250         }
2251         /* since we did not send a HB make sure we don't double things */
2252         if ((netp) && (*netp))
2253                 (*netp)->hb_responded = 1;
2254
2255         if (stcb->asoc.sctp_autoclose_ticks &&
2256             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2257                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL);
2258         }
2259         /* calculate the RTT */
2260         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
2261         if ((netp) && (*netp)) {
2262                 (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp,
2263                     &cookie->time_entered, sctp_align_unsafe_makecopy);
2264         }
2265         /* respond with a COOKIE-ACK */
2266         sctp_send_cookie_ack(stcb);
2267
2268         /*
2269          * check the address lists for any ASCONFs that need to be sent
2270          * AFTER the cookie-ack is sent
2271          */
2272         sctp_check_address_list(stcb, m,
2273             initack_offset + sizeof(struct sctp_init_ack_chunk),
2274             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)),
2275             initack_src, cookie->local_scope, cookie->site_scope,
2276             cookie->ipv4_scope, cookie->loopback_scope);
2277
2278
2279         return (stcb);
2280 }
2281
2282 /*
2283  * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e
2284  * we NEED to make sure we are not already using the vtag. If so we
2285  * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit!
2286         head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag,
2287                                                             SCTP_BASE_INFO(hashasocmark))];
2288         LIST_FOREACH(stcb, head, sctp_asocs) {
2289                 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep))  {
2290                        -- SEND ABORT - TRY AGAIN --
2291                 }
2292         }
2293 */
2294
2295 /*
2296  * handles a COOKIE-ECHO message stcb: modified to either a new or left as
2297  * existing (non-NULL) TCB
2298  */
2299 static struct mbuf *
2300 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset,
2301     struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp,
2302     struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp,
2303     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
2304     struct sctp_tcb **locked_tcb, uint32_t vrf_id, uint16_t port)
2305 {
2306         struct sctp_state_cookie *cookie;
2307         struct sockaddr_in6 sin6;
2308         struct sockaddr_in sin;
2309         struct sctp_tcb *l_stcb = *stcb;
2310         struct sctp_inpcb *l_inp;
2311         struct sockaddr *to;
2312         sctp_assoc_t sac_restart_id;
2313         struct sctp_pcb *ep;
2314         struct mbuf *m_sig;
2315         uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE];
2316         uint8_t *sig;
2317         uint8_t cookie_ok = 0;
2318         unsigned int size_of_pkt, sig_offset, cookie_offset;
2319         unsigned int cookie_len;
2320         struct timeval now;
2321         struct timeval time_expires;
2322         struct sockaddr_storage dest_store;
2323         struct sockaddr *localep_sa = (struct sockaddr *)&dest_store;
2324         struct ip *iph;
2325         int notification = 0;
2326         struct sctp_nets *netl;
2327         int had_a_existing_tcb = 0;
2328
2329         SCTPDBG(SCTP_DEBUG_INPUT2,
2330             "sctp_handle_cookie: handling COOKIE-ECHO\n");
2331
2332         if (inp_p == NULL) {
2333                 return (NULL);
2334         }
2335         /* First get the destination address setup too. */
2336         iph = mtod(m, struct ip *);
2337         switch (iph->ip_v) {
2338         case IPVERSION:
2339                 {
2340                         /* its IPv4 */
2341                         struct sockaddr_in *lsin;
2342
2343                         lsin = (struct sockaddr_in *)(localep_sa);
2344                         memset(lsin, 0, sizeof(*lsin));
2345                         lsin->sin_family = AF_INET;
2346                         lsin->sin_len = sizeof(*lsin);
2347                         lsin->sin_port = sh->dest_port;
2348                         lsin->sin_addr.s_addr = iph->ip_dst.s_addr;
2349                         size_of_pkt = SCTP_GET_IPV4_LENGTH(iph);
2350                         break;
2351                 }
2352 #ifdef INET6
2353         case IPV6_VERSION >> 4:
2354                 {
2355                         /* its IPv6 */
2356                         struct ip6_hdr *ip6;
2357                         struct sockaddr_in6 *lsin6;
2358
2359                         lsin6 = (struct sockaddr_in6 *)(localep_sa);
2360                         memset(lsin6, 0, sizeof(*lsin6));
2361                         lsin6->sin6_family = AF_INET6;
2362                         lsin6->sin6_len = sizeof(struct sockaddr_in6);
2363                         ip6 = mtod(m, struct ip6_hdr *);
2364                         lsin6->sin6_port = sh->dest_port;
2365                         lsin6->sin6_addr = ip6->ip6_dst;
2366                         size_of_pkt = SCTP_GET_IPV6_LENGTH(ip6) + iphlen;
2367                         break;
2368                 }
2369 #endif
2370         default:
2371                 return (NULL);
2372         }
2373
2374         cookie = &cp->cookie;
2375         cookie_offset = offset + sizeof(struct sctp_chunkhdr);
2376         cookie_len = ntohs(cp->ch.chunk_length);
2377
2378         if ((cookie->peerport != sh->src_port) &&
2379             (cookie->myport != sh->dest_port) &&
2380             (cookie->my_vtag != sh->v_tag)) {
2381                 /*
2382                  * invalid ports or bad tag.  Note that we always leave the
2383                  * v_tag in the header in network order and when we stored
2384                  * it in the my_vtag slot we also left it in network order.
2385                  * This maintains the match even though it may be in the
2386                  * opposite byte order of the machine :->
2387                  */
2388                 return (NULL);
2389         }
2390         if (cookie_len > size_of_pkt ||
2391             cookie_len < sizeof(struct sctp_cookie_echo_chunk) +
2392             sizeof(struct sctp_init_chunk) +
2393             sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) {
2394                 /* cookie too long!  or too small */
2395                 return (NULL);
2396         }
2397         /*
2398          * split off the signature into its own mbuf (since it should not be
2399          * calculated in the sctp_hmac_m() call).
2400          */
2401         sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE;
2402         if (sig_offset > size_of_pkt) {
2403                 /* packet not correct size! */
2404                 /* XXX this may already be accounted for earlier... */
2405                 return (NULL);
2406         }
2407         m_sig = m_split(m, sig_offset, M_DONTWAIT);
2408         if (m_sig == NULL) {
2409                 /* out of memory or ?? */
2410                 return (NULL);
2411         }
2412 #ifdef SCTP_MBUF_LOGGING
2413         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
2414                 struct mbuf *mat;
2415
2416                 mat = m_sig;
2417                 while (mat) {
2418                         if (SCTP_BUF_IS_EXTENDED(mat)) {
2419                                 sctp_log_mb(mat, SCTP_MBUF_SPLIT);
2420                         }
2421                         mat = SCTP_BUF_NEXT(mat);
2422                 }
2423         }
2424 #endif
2425
2426         /*
2427          * compute the signature/digest for the cookie
2428          */
2429         ep = &(*inp_p)->sctp_ep;
2430         l_inp = *inp_p;
2431         if (l_stcb) {
2432                 SCTP_TCB_UNLOCK(l_stcb);
2433         }
2434         SCTP_INP_RLOCK(l_inp);
2435         if (l_stcb) {
2436                 SCTP_TCB_LOCK(l_stcb);
2437         }
2438         /* which cookie is it? */
2439         if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) &&
2440             (ep->current_secret_number != ep->last_secret_number)) {
2441                 /* it's the old cookie */
2442                 (void)sctp_hmac_m(SCTP_HMAC,
2443                     (uint8_t *) ep->secret_key[(int)ep->last_secret_number],
2444                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2445         } else {
2446                 /* it's the current cookie */
2447                 (void)sctp_hmac_m(SCTP_HMAC,
2448                     (uint8_t *) ep->secret_key[(int)ep->current_secret_number],
2449                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2450         }
2451         /* get the signature */
2452         SCTP_INP_RUNLOCK(l_inp);
2453         sig = (uint8_t *) sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *) & tmp_sig);
2454         if (sig == NULL) {
2455                 /* couldn't find signature */
2456                 sctp_m_freem(m_sig);
2457                 return (NULL);
2458         }
2459         /* compare the received digest with the computed digest */
2460         if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) {
2461                 /* try the old cookie? */
2462                 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) &&
2463                     (ep->current_secret_number != ep->last_secret_number)) {
2464                         /* compute digest with old */
2465                         (void)sctp_hmac_m(SCTP_HMAC,
2466                             (uint8_t *) ep->secret_key[(int)ep->last_secret_number],
2467                             SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2468                         /* compare */
2469                         if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0)
2470                                 cookie_ok = 1;
2471                 }
2472         } else {
2473                 cookie_ok = 1;
2474         }
2475
2476         /*
2477          * Now before we continue we must reconstruct our mbuf so that
2478          * normal processing of any other chunks will work.
2479          */
2480         {
2481                 struct mbuf *m_at;
2482
2483                 m_at = m;
2484                 while (SCTP_BUF_NEXT(m_at) != NULL) {
2485                         m_at = SCTP_BUF_NEXT(m_at);
2486                 }
2487                 SCTP_BUF_NEXT(m_at) = m_sig;
2488         }
2489
2490         if (cookie_ok == 0) {
2491                 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n");
2492                 SCTPDBG(SCTP_DEBUG_INPUT2,
2493                     "offset = %u, cookie_offset = %u, sig_offset = %u\n",
2494                     (uint32_t) offset, cookie_offset, sig_offset);
2495                 return (NULL);
2496         }
2497         /*
2498          * check the cookie timestamps to be sure it's not stale
2499          */
2500         (void)SCTP_GETTIME_TIMEVAL(&now);
2501         /* Expire time is in Ticks, so we convert to seconds */
2502         time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life);
2503         time_expires.tv_usec = cookie->time_entered.tv_usec;
2504         /*
2505          * TODO sctp_constants.h needs alternative time macros when _KERNEL
2506          * is undefined.
2507          */
2508         if (timevalcmp(&now, &time_expires, >)) {
2509                 /* cookie is stale! */
2510                 struct mbuf *op_err;
2511                 struct sctp_stale_cookie_msg *scm;
2512                 uint32_t tim;
2513
2514                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_stale_cookie_msg),
2515                     0, M_DONTWAIT, 1, MT_DATA);
2516                 if (op_err == NULL) {
2517                         /* FOOBAR */
2518                         return (NULL);
2519                 }
2520                 /* Set the len */
2521                 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_stale_cookie_msg);
2522                 scm = mtod(op_err, struct sctp_stale_cookie_msg *);
2523                 scm->ph.param_type = htons(SCTP_CAUSE_STALE_COOKIE);
2524                 scm->ph.param_length = htons((sizeof(struct sctp_paramhdr) +
2525                     (sizeof(uint32_t))));
2526                 /* seconds to usec */
2527                 tim = (now.tv_sec - time_expires.tv_sec) * 1000000;
2528                 /* add in usec */
2529                 if (tim == 0)
2530                         tim = now.tv_usec - cookie->time_entered.tv_usec;
2531                 scm->time_usec = htonl(tim);
2532                 sctp_send_operr_to(m, iphlen, op_err, cookie->peers_vtag,
2533                     vrf_id, port);
2534                 return (NULL);
2535         }
2536         /*
2537          * Now we must see with the lookup address if we have an existing
2538          * asoc. This will only happen if we were in the COOKIE-WAIT state
2539          * and a INIT collided with us and somewhere the peer sent the
2540          * cookie on another address besides the single address our assoc
2541          * had for him. In this case we will have one of the tie-tags set at
2542          * least AND the address field in the cookie can be used to look it
2543          * up.
2544          */
2545         to = NULL;
2546         if (cookie->addr_type == SCTP_IPV6_ADDRESS) {
2547                 memset(&sin6, 0, sizeof(sin6));
2548                 sin6.sin6_family = AF_INET6;
2549                 sin6.sin6_len = sizeof(sin6);
2550                 sin6.sin6_port = sh->src_port;
2551                 sin6.sin6_scope_id = cookie->scope_id;
2552                 memcpy(&sin6.sin6_addr.s6_addr, cookie->address,
2553                     sizeof(sin6.sin6_addr.s6_addr));
2554                 to = (struct sockaddr *)&sin6;
2555         } else if (cookie->addr_type == SCTP_IPV4_ADDRESS) {
2556                 memset(&sin, 0, sizeof(sin));
2557                 sin.sin_family = AF_INET;
2558                 sin.sin_len = sizeof(sin);
2559                 sin.sin_port = sh->src_port;
2560                 sin.sin_addr.s_addr = cookie->address[0];
2561                 to = (struct sockaddr *)&sin;
2562         } else {
2563                 /* This should not happen */
2564                 return (NULL);
2565         }
2566         if ((*stcb == NULL) && to) {
2567                 /* Yep, lets check */
2568                 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, localep_sa, NULL);
2569                 if (*stcb == NULL) {
2570                         /*
2571                          * We should have only got back the same inp. If we
2572                          * got back a different ep we have a problem. The
2573                          * original findep got back l_inp and now
2574                          */
2575                         if (l_inp != *inp_p) {
2576                                 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n");
2577                         }
2578                 } else {
2579                         if (*locked_tcb == NULL) {
2580                                 /*
2581                                  * In this case we found the assoc only
2582                                  * after we locked the create lock. This
2583                                  * means we are in a colliding case and we
2584                                  * must make sure that we unlock the tcb if
2585                                  * its one of the cases where we throw away
2586                                  * the incoming packets.
2587                                  */
2588                                 *locked_tcb = *stcb;
2589
2590                                 /*
2591                                  * We must also increment the inp ref count
2592                                  * since the ref_count flags was set when we
2593                                  * did not find the TCB, now we found it
2594                                  * which reduces the refcount.. we must
2595                                  * raise it back out to balance it all :-)
2596                                  */
2597                                 SCTP_INP_INCR_REF((*stcb)->sctp_ep);
2598                                 if ((*stcb)->sctp_ep != l_inp) {
2599                                         SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n",
2600                                             (*stcb)->sctp_ep, l_inp);
2601                                 }
2602                         }
2603                 }
2604         }
2605         if (to == NULL) {
2606                 return (NULL);
2607         }
2608         cookie_len -= SCTP_SIGNATURE_SIZE;
2609         if (*stcb == NULL) {
2610                 /* this is the "normal" case... get a new TCB */
2611                 *stcb = sctp_process_cookie_new(m, iphlen, offset, sh, cookie,
2612                     cookie_len, *inp_p, netp, to, &notification,
2613                     auth_skipped, auth_offset, auth_len, vrf_id, port);
2614         } else {
2615                 /* this is abnormal... cookie-echo on existing TCB */
2616                 had_a_existing_tcb = 1;
2617                 *stcb = sctp_process_cookie_existing(m, iphlen, offset, sh,
2618                     cookie, cookie_len, *inp_p, *stcb, netp, to,
2619                     &notification, &sac_restart_id, vrf_id, auth_skipped, auth_offset, auth_len, port);
2620         }
2621
2622         if (*stcb == NULL) {
2623                 /* still no TCB... must be bad cookie-echo */
2624                 return (NULL);
2625         }
2626         /*
2627          * Ok, we built an association so confirm the address we sent the
2628          * INIT-ACK to.
2629          */
2630         netl = sctp_findnet(*stcb, to);
2631         /*
2632          * This code should in theory NOT run but
2633          */
2634         if (netl == NULL) {
2635                 /* TSNH! Huh, why do I need to add this address here? */
2636                 int ret;
2637
2638                 ret = sctp_add_remote_addr(*stcb, to, SCTP_DONOT_SETSCOPE,
2639                     SCTP_IN_COOKIE_PROC);
2640                 netl = sctp_findnet(*stcb, to);
2641         }
2642         if (netl) {
2643                 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) {
2644                         netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
2645                         (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL,
2646                             netl);
2647                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2648                             (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2649                 }
2650         }
2651         if (*stcb) {
2652                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, *inp_p,
2653                     *stcb, NULL);
2654         }
2655         if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
2656                 if (!had_a_existing_tcb ||
2657                     (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
2658                         /*
2659                          * If we have a NEW cookie or the connect never
2660                          * reached the connected state during collision we
2661                          * must do the TCP accept thing.
2662                          */
2663                         struct socket *so, *oso;
2664                         struct sctp_inpcb *inp;
2665
2666                         if (notification == SCTP_NOTIFY_ASSOC_RESTART) {
2667                                 /*
2668                                  * For a restart we will keep the same
2669                                  * socket, no need to do anything. I THINK!!
2670                                  */
2671                                 sctp_ulp_notify(notification, *stcb, 0, (void *)&sac_restart_id, SCTP_SO_NOT_LOCKED);
2672                                 return (m);
2673                         }
2674                         oso = (*inp_p)->sctp_socket;
2675                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2676                         SCTP_TCB_UNLOCK((*stcb));
2677                         so = sonewconn(oso, 0
2678                             );
2679                         SCTP_TCB_LOCK((*stcb));
2680                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2681
2682                         if (so == NULL) {
2683                                 struct mbuf *op_err;
2684
2685 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2686                                 struct socket *pcb_so;
2687
2688 #endif
2689                                 /* Too many sockets */
2690                                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n");
2691                                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC);
2692                                 sctp_abort_association(*inp_p, NULL, m, iphlen,
2693                                     sh, op_err, vrf_id, port);
2694 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2695                                 pcb_so = SCTP_INP_SO(*inp_p);
2696                                 atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2697                                 SCTP_TCB_UNLOCK((*stcb));
2698                                 SCTP_SOCKET_LOCK(pcb_so, 1);
2699                                 SCTP_TCB_LOCK((*stcb));
2700                                 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2701 #endif
2702                                 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_20);
2703 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2704                                 SCTP_SOCKET_UNLOCK(pcb_so, 1);
2705 #endif
2706                                 return (NULL);
2707                         }
2708                         inp = (struct sctp_inpcb *)so->so_pcb;
2709                         SCTP_INP_INCR_REF(inp);
2710                         /*
2711                          * We add the unbound flag here so that if we get an
2712                          * soabort() before we get the move_pcb done, we
2713                          * will properly cleanup.
2714                          */
2715                         inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE |
2716                             SCTP_PCB_FLAGS_CONNECTED |
2717                             SCTP_PCB_FLAGS_IN_TCPPOOL |
2718                             SCTP_PCB_FLAGS_UNBOUND |
2719                             (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) |
2720                             SCTP_PCB_FLAGS_DONT_WAKE);
2721                         inp->sctp_features = (*inp_p)->sctp_features;
2722                         inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features;
2723                         inp->sctp_socket = so;
2724                         inp->sctp_frag_point = (*inp_p)->sctp_frag_point;
2725                         inp->partial_delivery_point = (*inp_p)->partial_delivery_point;
2726                         inp->sctp_context = (*inp_p)->sctp_context;
2727                         inp->inp_starting_point_for_iterator = NULL;
2728                         /*
2729                          * copy in the authentication parameters from the
2730                          * original endpoint
2731                          */
2732                         if (inp->sctp_ep.local_hmacs)
2733                                 sctp_free_hmaclist(inp->sctp_ep.local_hmacs);
2734                         inp->sctp_ep.local_hmacs =
2735                             sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs);
2736                         if (inp->sctp_ep.local_auth_chunks)
2737                                 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks);
2738                         inp->sctp_ep.local_auth_chunks =
2739                             sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks);
2740
2741                         /*
2742                          * Now we must move it from one hash table to
2743                          * another and get the tcb in the right place.
2744                          */
2745                         sctp_move_pcb_and_assoc(*inp_p, inp, *stcb);
2746
2747                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2748                         SCTP_TCB_UNLOCK((*stcb));
2749
2750                         sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb,
2751                             0);
2752                         SCTP_TCB_LOCK((*stcb));
2753                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2754
2755
2756                         /*
2757                          * now we must check to see if we were aborted while
2758                          * the move was going on and the lock/unlock
2759                          * happened.
2760                          */
2761                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
2762                                 /*
2763                                  * yep it was, we leave the assoc attached
2764                                  * to the socket since the sctp_inpcb_free()
2765                                  * call will send an abort for us.
2766                                  */
2767                                 SCTP_INP_DECR_REF(inp);
2768                                 return (NULL);
2769                         }
2770                         SCTP_INP_DECR_REF(inp);
2771                         /* Switch over to the new guy */
2772                         *inp_p = inp;
2773                         sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2774
2775                         /*
2776                          * Pull it from the incomplete queue and wake the
2777                          * guy
2778                          */
2779 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2780                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2781                         SCTP_TCB_UNLOCK((*stcb));
2782                         SCTP_SOCKET_LOCK(so, 1);
2783 #endif
2784                         soisconnected(so);
2785 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2786                         SCTP_TCB_LOCK((*stcb));
2787                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2788                         SCTP_SOCKET_UNLOCK(so, 1);
2789 #endif
2790                         return (m);
2791                 }
2792         }
2793         if ((notification) && ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE)) {
2794                 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2795         }
2796         return (m);
2797 }
2798
2799 static void
2800 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp,
2801     struct sctp_tcb *stcb, struct sctp_nets *net)
2802 {
2803         /* cp must not be used, others call this without a c-ack :-) */
2804         struct sctp_association *asoc;
2805
2806         SCTPDBG(SCTP_DEBUG_INPUT2,
2807             "sctp_handle_cookie_ack: handling COOKIE-ACK\n");
2808         if (stcb == NULL)
2809                 return;
2810
2811         asoc = &stcb->asoc;
2812
2813         sctp_stop_all_cookie_timers(stcb);
2814         /* process according to association state */
2815         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) {
2816                 /* state change only needed when I am in right state */
2817                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2818                 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
2819                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2820                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2821                             stcb->sctp_ep, stcb, asoc->primary_destination);
2822
2823                 }
2824                 /* update RTO */
2825                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
2826                 SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2827                 if (asoc->overall_error_count == 0) {
2828                         net->RTO = sctp_calculate_rto(stcb, asoc, net,
2829                             &asoc->time_entered, sctp_align_safe_nocopy);
2830                 }
2831                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
2832                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2833                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2834                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
2835 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2836                         struct socket *so;
2837
2838 #endif
2839                         stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2840 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2841                         so = SCTP_INP_SO(stcb->sctp_ep);
2842                         atomic_add_int(&stcb->asoc.refcnt, 1);
2843                         SCTP_TCB_UNLOCK(stcb);
2844                         SCTP_SOCKET_LOCK(so, 1);
2845                         SCTP_TCB_LOCK(stcb);
2846                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
2847                         if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
2848                                 SCTP_SOCKET_UNLOCK(so, 1);
2849                                 return;
2850                         }
2851 #endif
2852                         soisconnected(stcb->sctp_socket);
2853 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2854                         SCTP_SOCKET_UNLOCK(so, 1);
2855 #endif
2856                 }
2857                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
2858                     stcb, net);
2859                 /*
2860                  * since we did not send a HB make sure we don't double
2861                  * things
2862                  */
2863                 net->hb_responded = 1;
2864
2865                 if (stcb->asoc.sctp_autoclose_ticks &&
2866                     sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2867                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
2868                             stcb->sctp_ep, stcb, NULL);
2869                 }
2870                 /*
2871                  * send ASCONF if parameters are pending and ASCONFs are
2872                  * allowed (eg. addresses changed when init/cookie echo were
2873                  * in flight)
2874                  */
2875                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) &&
2876                     (stcb->asoc.peer_supports_asconf) &&
2877                     (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) {
2878 #ifdef SCTP_TIMER_BASED_ASCONF
2879                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF,
2880                             stcb->sctp_ep, stcb,
2881                             stcb->asoc.primary_destination);
2882 #else
2883                         sctp_send_asconf(stcb, stcb->asoc.primary_destination,
2884                             SCTP_ADDR_NOT_LOCKED);
2885 #endif
2886                 }
2887         }
2888         /* Toss the cookie if I can */
2889         sctp_toss_old_cookies(stcb, asoc);
2890         if (!TAILQ_EMPTY(&asoc->sent_queue)) {
2891                 /* Restart the timer if we have pending data */
2892                 struct sctp_tmit_chunk *chk;
2893
2894                 chk = TAILQ_FIRST(&asoc->sent_queue);
2895                 if (chk) {
2896                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
2897                             stcb, chk->whoTo);
2898                 }
2899         }
2900 }
2901
2902 static void
2903 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp,
2904     struct sctp_tcb *stcb)
2905 {
2906         struct sctp_nets *net;
2907         struct sctp_tmit_chunk *lchk;
2908         uint32_t tsn;
2909
2910         if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_ecne_chunk)) {
2911                 return;
2912         }
2913         SCTP_STAT_INCR(sctps_recvecne);
2914         tsn = ntohl(cp->tsn);
2915         /* ECN Nonce stuff: need a resync and disable the nonce sum check */
2916         /* Also we make sure we disable the nonce_wait */
2917         lchk = TAILQ_FIRST(&stcb->asoc.send_queue);
2918         if (lchk == NULL) {
2919                 stcb->asoc.nonce_resync_tsn = stcb->asoc.sending_seq;
2920         } else {
2921                 stcb->asoc.nonce_resync_tsn = lchk->rec.data.TSN_seq;
2922         }
2923         stcb->asoc.nonce_wait_for_ecne = 0;
2924         stcb->asoc.nonce_sum_check = 0;
2925
2926         /* Find where it was sent, if possible */
2927         net = NULL;
2928         lchk = TAILQ_FIRST(&stcb->asoc.sent_queue);
2929         while (lchk) {
2930                 if (lchk->rec.data.TSN_seq == tsn) {
2931                         net = lchk->whoTo;
2932                         break;
2933                 }
2934                 if (compare_with_wrap(lchk->rec.data.TSN_seq, tsn, MAX_SEQ))
2935                         break;
2936                 lchk = TAILQ_NEXT(lchk, sctp_next);
2937         }
2938         if (net == NULL)
2939                 /* default is we use the primary */
2940                 net = stcb->asoc.primary_destination;
2941
2942         if (compare_with_wrap(tsn, stcb->asoc.last_cwr_tsn, MAX_TSN)) {
2943                 /*
2944                  * JRS - Use the congestion control given in the pluggable
2945                  * CC module
2946                  */
2947                 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net);
2948                 /*
2949                  * we reduce once every RTT. So we will only lower cwnd at
2950                  * the next sending seq i.e. the resync_tsn.
2951                  */
2952                 stcb->asoc.last_cwr_tsn = stcb->asoc.nonce_resync_tsn;
2953         }
2954         /*
2955          * We always send a CWR this way if our previous one was lost our
2956          * peer will get an update, or if it is not time again to reduce we
2957          * still get the cwr to the peer.
2958          */
2959         sctp_send_cwr(stcb, net, tsn);
2960 }
2961
2962 static void
2963 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb)
2964 {
2965         /*
2966          * Here we get a CWR from the peer. We must look in the outqueue and
2967          * make sure that we have a covered ECNE in teh control chunk part.
2968          * If so remove it.
2969          */
2970         struct sctp_tmit_chunk *chk;
2971         struct sctp_ecne_chunk *ecne;
2972
2973         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
2974                 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) {
2975                         continue;
2976                 }
2977                 /*
2978                  * Look for and remove if it is the right TSN. Since there
2979                  * is only ONE ECNE on the control queue at any one time we
2980                  * don't need to worry about more than one!
2981                  */
2982                 ecne = mtod(chk->data, struct sctp_ecne_chunk *);
2983                 if (compare_with_wrap(ntohl(cp->tsn), ntohl(ecne->tsn),
2984                     MAX_TSN) || (cp->tsn == ecne->tsn)) {
2985                         /* this covers this ECNE, we can remove it */
2986                         stcb->asoc.ecn_echo_cnt_onq--;
2987                         TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk,
2988                             sctp_next);
2989                         if (chk->data) {
2990                                 sctp_m_freem(chk->data);
2991                                 chk->data = NULL;
2992                         }
2993                         stcb->asoc.ctrl_queue_cnt--;
2994                         sctp_free_a_chunk(stcb, chk);
2995                         break;
2996                 }
2997         }
2998 }
2999
3000 static void
3001 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp,
3002     struct sctp_tcb *stcb, struct sctp_nets *net)
3003 {
3004         struct sctp_association *asoc;
3005
3006 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3007         struct socket *so;
3008
3009 #endif
3010
3011         SCTPDBG(SCTP_DEBUG_INPUT2,
3012             "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n");
3013         if (stcb == NULL)
3014                 return;
3015
3016         asoc = &stcb->asoc;
3017         /* process according to association state */
3018         if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
3019                 /* unexpected SHUTDOWN-COMPLETE... so ignore... */
3020                 SCTPDBG(SCTP_DEBUG_INPUT2,
3021                     "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n");
3022                 SCTP_TCB_UNLOCK(stcb);
3023                 return;
3024         }
3025         /* notify upper layer protocol */
3026         if (stcb->sctp_socket) {
3027                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
3028                 /* are the queues empty? they should be */
3029                 if (!TAILQ_EMPTY(&asoc->send_queue) ||
3030                     !TAILQ_EMPTY(&asoc->sent_queue) ||
3031                     !TAILQ_EMPTY(&asoc->out_wheel)) {
3032                         sctp_report_all_outbound(stcb, 0, SCTP_SO_NOT_LOCKED);
3033                 }
3034         }
3035         /* stop the timer */
3036         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_22);
3037         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
3038         /* free the TCB */
3039         SCTPDBG(SCTP_DEBUG_INPUT2,
3040             "sctp_handle_shutdown_complete: calls free-asoc\n");
3041 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3042         so = SCTP_INP_SO(stcb->sctp_ep);
3043         atomic_add_int(&stcb->asoc.refcnt, 1);
3044         SCTP_TCB_UNLOCK(stcb);
3045         SCTP_SOCKET_LOCK(so, 1);
3046         SCTP_TCB_LOCK(stcb);
3047         atomic_subtract_int(&stcb->asoc.refcnt, 1);
3048 #endif
3049         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_23);
3050 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3051         SCTP_SOCKET_UNLOCK(so, 1);
3052 #endif
3053         return;
3054 }
3055
3056 static int
3057 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc,
3058     struct sctp_nets *net, uint8_t flg)
3059 {
3060         switch (desc->chunk_type) {
3061                 case SCTP_DATA:
3062                 /* find the tsn to resend (possibly */
3063                 {
3064                         uint32_t tsn;
3065                         struct sctp_tmit_chunk *tp1;
3066
3067                         tsn = ntohl(desc->tsn_ifany);
3068                         tp1 = TAILQ_FIRST(&stcb->asoc.sent_queue);
3069                         while (tp1) {
3070                                 if (tp1->rec.data.TSN_seq == tsn) {
3071                                         /* found it */
3072                                         break;
3073                                 }
3074                                 if (compare_with_wrap(tp1->rec.data.TSN_seq, tsn,
3075                                     MAX_TSN)) {
3076                                         /* not found */
3077                                         tp1 = NULL;
3078                                         break;
3079                                 }
3080                                 tp1 = TAILQ_NEXT(tp1, sctp_next);
3081                         }
3082                         if (tp1 == NULL) {
3083                                 /*
3084                                  * Do it the other way , aka without paying
3085                                  * attention to queue seq order.
3086                                  */
3087                                 SCTP_STAT_INCR(sctps_pdrpdnfnd);
3088                                 tp1 = TAILQ_FIRST(&stcb->asoc.sent_queue);
3089                                 while (tp1) {
3090                                         if (tp1->rec.data.TSN_seq == tsn) {
3091                                                 /* found it */
3092                                                 break;
3093                                         }
3094                                         tp1 = TAILQ_NEXT(tp1, sctp_next);
3095                                 }
3096                         }
3097                         if (tp1 == NULL) {
3098                                 SCTP_STAT_INCR(sctps_pdrptsnnf);
3099                         }
3100                         if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) {
3101                                 uint8_t *ddp;
3102
3103                                 if ((stcb->asoc.peers_rwnd == 0) &&
3104                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3105                                         SCTP_STAT_INCR(sctps_pdrpdiwnp);
3106                                         return (0);
3107                                 }
3108                                 if (stcb->asoc.peers_rwnd == 0 &&
3109                                     (flg & SCTP_FROM_MIDDLE_BOX)) {
3110                                         SCTP_STAT_INCR(sctps_pdrpdizrw);
3111                                         return (0);
3112                                 }
3113                                 ddp = (uint8_t *) (mtod(tp1->data, caddr_t)+
3114                                     sizeof(struct sctp_data_chunk));
3115                                 {
3116                                         unsigned int iii;
3117
3118                                         for (iii = 0; iii < sizeof(desc->data_bytes);
3119                                             iii++) {
3120                                                 if (ddp[iii] != desc->data_bytes[iii]) {
3121                                                         SCTP_STAT_INCR(sctps_pdrpbadd);
3122                                                         return (-1);
3123                                                 }
3124                                         }
3125                                 }
3126                                 /*
3127                                  * We zero out the nonce so resync not
3128                                  * needed
3129                                  */
3130                                 tp1->rec.data.ect_nonce = 0;
3131
3132                                 if (tp1->do_rtt) {
3133                                         /*
3134                                          * this guy had a RTO calculation
3135                                          * pending on it, cancel it
3136                                          */
3137                                         tp1->do_rtt = 0;
3138                                 }
3139                                 SCTP_STAT_INCR(sctps_pdrpmark);
3140                                 if (tp1->sent != SCTP_DATAGRAM_RESEND)
3141                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3142                                 tp1->sent = SCTP_DATAGRAM_RESEND;
3143                                 /*
3144                                  * mark it as if we were doing a FR, since
3145                                  * we will be getting gap ack reports behind
3146                                  * the info from the router.
3147                                  */
3148                                 tp1->rec.data.doing_fast_retransmit = 1;
3149                                 /*
3150                                  * mark the tsn with what sequences can
3151                                  * cause a new FR.
3152                                  */
3153                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) {
3154                                         tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
3155                                 } else {
3156                                         tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq;
3157                                 }
3158
3159                                 /* restart the timer */
3160                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3161                                     stcb, tp1->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_24);
3162                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3163                                     stcb, tp1->whoTo);
3164
3165                                 /* fix counts and things */
3166                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
3167                                         sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP,
3168                                             tp1->whoTo->flight_size,
3169                                             tp1->book_size,
3170                                             (uintptr_t) stcb,
3171                                             tp1->rec.data.TSN_seq);
3172                                 }
3173                                 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
3174                                         sctp_flight_size_decrease(tp1);
3175                                         sctp_total_flight_decrease(stcb, tp1);
3176                                 }
3177                         } {
3178                                 /* audit code */
3179                                 unsigned int audit;
3180
3181                                 audit = 0;
3182                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3183                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3184                                                 audit++;
3185                                 }
3186                                 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue,
3187                                     sctp_next) {
3188                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3189                                                 audit++;
3190                                 }
3191                                 if (audit != stcb->asoc.sent_queue_retran_cnt) {
3192                                         SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n",
3193                                             audit, stcb->asoc.sent_queue_retran_cnt);
3194 #ifndef SCTP_AUDITING_ENABLED
3195                                         stcb->asoc.sent_queue_retran_cnt = audit;
3196 #endif
3197                                 }
3198                         }
3199                 }
3200                 break;
3201         case SCTP_ASCONF:
3202                 {
3203                         struct sctp_tmit_chunk *asconf;
3204
3205                         TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue,
3206                             sctp_next) {
3207                                 if (asconf->rec.chunk_id.id == SCTP_ASCONF) {
3208                                         break;
3209                                 }
3210                         }
3211                         if (asconf) {
3212                                 if (asconf->sent != SCTP_DATAGRAM_RESEND)
3213                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3214                                 asconf->sent = SCTP_DATAGRAM_RESEND;
3215                                 asconf->snd_count--;
3216                         }
3217                 }
3218                 break;
3219         case SCTP_INITIATION:
3220                 /* resend the INIT */
3221                 stcb->asoc.dropped_special_cnt++;
3222                 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) {
3223                         /*
3224                          * If we can get it in, in a few attempts we do
3225                          * this, otherwise we let the timer fire.
3226                          */
3227                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep,
3228                             stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_25);
3229                         sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
3230                 }
3231                 break;
3232         case SCTP_SELECTIVE_ACK:
3233                 /* resend the sack */
3234                 sctp_send_sack(stcb);
3235                 break;
3236                 /* EY for nr_sacks */
3237         case SCTP_NR_SELECTIVE_ACK:
3238                 sctp_send_nr_sack(stcb);        /* EY resend the nr-sack */
3239                 break;
3240         case SCTP_HEARTBEAT_REQUEST:
3241                 /* resend a demand HB */
3242                 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) {
3243                         /*
3244                          * Only retransmit if we KNOW we wont destroy the
3245                          * tcb
3246                          */
3247                         (void)sctp_send_hb(stcb, 1, net);
3248                 }
3249                 break;
3250         case SCTP_SHUTDOWN:
3251                 sctp_send_shutdown(stcb, net);
3252                 break;
3253         case SCTP_SHUTDOWN_ACK:
3254                 sctp_send_shutdown_ack(stcb, net);
3255                 break;
3256         case SCTP_COOKIE_ECHO:
3257                 {
3258                         struct sctp_tmit_chunk *cookie;
3259
3260                         cookie = NULL;
3261                         TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue,
3262                             sctp_next) {
3263                                 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
3264                                         break;
3265                                 }
3266                         }
3267                         if (cookie) {
3268                                 if (cookie->sent != SCTP_DATAGRAM_RESEND)
3269                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3270                                 cookie->sent = SCTP_DATAGRAM_RESEND;
3271                                 sctp_stop_all_cookie_timers(stcb);
3272                         }
3273                 }
3274                 break;
3275         case SCTP_COOKIE_ACK:
3276                 sctp_send_cookie_ack(stcb);
3277                 break;
3278         case SCTP_ASCONF_ACK:
3279                 /* resend last asconf ack */
3280                 sctp_send_asconf_ack(stcb);
3281                 break;
3282         case SCTP_FORWARD_CUM_TSN:
3283                 send_forward_tsn(stcb, &stcb->asoc);
3284                 break;
3285                 /* can't do anything with these */
3286         case SCTP_PACKET_DROPPED:
3287         case SCTP_INITIATION_ACK:       /* this should not happen */
3288         case SCTP_HEARTBEAT_ACK:
3289         case SCTP_ABORT_ASSOCIATION:
3290         case SCTP_OPERATION_ERROR:
3291         case SCTP_SHUTDOWN_COMPLETE:
3292         case SCTP_ECN_ECHO:
3293         case SCTP_ECN_CWR:
3294         default:
3295                 break;
3296         }
3297         return (0);
3298 }
3299
3300 void
3301 sctp_reset_in_stream(struct sctp_tcb *stcb, int number_entries, uint16_t * list)
3302 {
3303         int i;
3304         uint16_t temp;
3305
3306         /*
3307          * We set things to 0xffff since this is the last delivered sequence
3308          * and we will be sending in 0 after the reset.
3309          */
3310
3311         if (number_entries) {
3312                 for (i = 0; i < number_entries; i++) {
3313                         temp = ntohs(list[i]);
3314                         if (temp >= stcb->asoc.streamincnt) {
3315                                 continue;
3316                         }
3317                         stcb->asoc.strmin[temp].last_sequence_delivered = 0xffff;
3318                 }
3319         } else {
3320                 list = NULL;
3321                 for (i = 0; i < stcb->asoc.streamincnt; i++) {
3322                         stcb->asoc.strmin[i].last_sequence_delivered = 0xffff;
3323                 }
3324         }
3325         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3326 }
3327
3328 static void
3329 sctp_reset_out_streams(struct sctp_tcb *stcb, int number_entries, uint16_t * list)
3330 {
3331         int i;
3332
3333         if (number_entries == 0) {
3334                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3335                         stcb->asoc.strmout[i].next_sequence_sent = 0;
3336                 }
3337         } else if (number_entries) {
3338                 for (i = 0; i < number_entries; i++) {
3339                         uint16_t temp;
3340
3341                         temp = ntohs(list[i]);
3342                         if (temp >= stcb->asoc.streamoutcnt) {
3343                                 /* no such stream */
3344                                 continue;
3345                         }
3346                         stcb->asoc.strmout[temp].next_sequence_sent = 0;
3347                 }
3348         }
3349         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3350 }
3351
3352
3353 struct sctp_stream_reset_out_request *
3354 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk)
3355 {
3356         struct sctp_association *asoc;
3357         struct sctp_stream_reset_out_req *req;
3358         struct sctp_stream_reset_out_request *r;
3359         struct sctp_tmit_chunk *chk;
3360         int len, clen;
3361
3362         asoc = &stcb->asoc;
3363         if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
3364                 asoc->stream_reset_outstanding = 0;
3365                 return (NULL);
3366         }
3367         if (stcb->asoc.str_reset == NULL) {
3368                 asoc->stream_reset_outstanding = 0;
3369                 return (NULL);
3370         }
3371         chk = stcb->asoc.str_reset;
3372         if (chk->data == NULL) {
3373                 return (NULL);
3374         }
3375         if (bchk) {
3376                 /* he wants a copy of the chk pointer */
3377                 *bchk = chk;
3378         }
3379         clen = chk->send_size;
3380         req = mtod(chk->data, struct sctp_stream_reset_out_req *);
3381         r = &req->sr_req;
3382         if (ntohl(r->request_seq) == seq) {
3383                 /* found it */
3384                 return (r);
3385         }
3386         len = SCTP_SIZE32(ntohs(r->ph.param_length));
3387         if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) {
3388                 /* move to the next one, there can only be a max of two */
3389                 r = (struct sctp_stream_reset_out_request *)((caddr_t)r + len);
3390                 if (ntohl(r->request_seq) == seq) {
3391                         return (r);
3392                 }
3393         }
3394         /* that seq is not here */
3395         return (NULL);
3396 }
3397
3398 static void
3399 sctp_clean_up_stream_reset(struct sctp_tcb *stcb)
3400 {
3401         struct sctp_association *asoc;
3402         struct sctp_tmit_chunk *chk = stcb->asoc.str_reset;
3403
3404         if (stcb->asoc.str_reset == NULL) {
3405                 return;
3406         }
3407         asoc = &stcb->asoc;
3408
3409         sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_26);
3410         TAILQ_REMOVE(&asoc->control_send_queue,
3411             chk,
3412             sctp_next);
3413         if (chk->data) {
3414                 sctp_m_freem(chk->data);
3415                 chk->data = NULL;
3416         }
3417         asoc->ctrl_queue_cnt--;
3418         sctp_free_a_chunk(stcb, chk);
3419         /* sa_ignore NO_NULL_CHK */
3420         stcb->asoc.str_reset = NULL;
3421 }
3422
3423
3424 static int
3425 sctp_handle_stream_reset_response(struct sctp_tcb *stcb,
3426     uint32_t seq, uint32_t action,
3427     struct sctp_stream_reset_response *respin)
3428 {
3429         uint16_t type;
3430         int lparm_len;
3431         struct sctp_association *asoc = &stcb->asoc;
3432         struct sctp_tmit_chunk *chk;
3433         struct sctp_stream_reset_out_request *srparam;
3434         int number_entries;
3435
3436         if (asoc->stream_reset_outstanding == 0) {
3437                 /* duplicate */
3438                 return (0);
3439         }
3440         if (seq == stcb->asoc.str_reset_seq_out) {
3441                 srparam = sctp_find_stream_reset(stcb, seq, &chk);
3442                 if (srparam) {
3443                         stcb->asoc.str_reset_seq_out++;
3444                         type = ntohs(srparam->ph.param_type);
3445                         lparm_len = ntohs(srparam->ph.param_length);
3446                         if (type == SCTP_STR_RESET_OUT_REQUEST) {
3447                                 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t);
3448                                 asoc->stream_reset_out_is_outstanding = 0;
3449                                 if (asoc->stream_reset_outstanding)
3450                                         asoc->stream_reset_outstanding--;
3451                                 if (action == SCTP_STREAM_RESET_PERFORMED) {
3452                                         /* do it */
3453                                         sctp_reset_out_streams(stcb, number_entries, srparam->list_of_streams);
3454                                 } else {
3455                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED);
3456                                 }
3457                         } else if (type == SCTP_STR_RESET_IN_REQUEST) {
3458                                 /* Answered my request */
3459                                 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t);
3460                                 if (asoc->stream_reset_outstanding)
3461                                         asoc->stream_reset_outstanding--;
3462                                 if (action != SCTP_STREAM_RESET_PERFORMED) {
3463                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb, number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED);
3464                                 }
3465                         } else if (type == SCTP_STR_RESET_ADD_STREAMS) {
3466                                 /* Ok we now may have more streams */
3467                                 if (asoc->stream_reset_outstanding)
3468                                         asoc->stream_reset_outstanding--;
3469                                 if (action == SCTP_STREAM_RESET_PERFORMED) {
3470                                         /* Put the new streams into effect */
3471                                         stcb->asoc.streamoutcnt = stcb->asoc.strm_realoutsize;
3472                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_ADD_OK, stcb,
3473                                             (uint32_t) stcb->asoc.streamoutcnt, NULL, SCTP_SO_NOT_LOCKED);
3474                                 } else {
3475                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_ADD_FAIL, stcb,
3476                                             (uint32_t) stcb->asoc.streamoutcnt, NULL, SCTP_SO_NOT_LOCKED);
3477                                 }
3478                         } else if (type == SCTP_STR_RESET_TSN_REQUEST) {
3479                                 /**
3480                                  * a) Adopt the new in tsn.
3481                                  * b) reset the map
3482                                  * c) Adopt the new out-tsn
3483                                  */
3484                                 struct sctp_stream_reset_response_tsn *resp;
3485                                 struct sctp_forward_tsn_chunk fwdtsn;
3486                                 int abort_flag = 0;
3487
3488                                 if (respin == NULL) {
3489                                         /* huh ? */
3490                                         return (0);
3491                                 }
3492                                 if (action == SCTP_STREAM_RESET_PERFORMED) {
3493                                         resp = (struct sctp_stream_reset_response_tsn *)respin;
3494                                         asoc->stream_reset_outstanding--;
3495                                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3496                                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3497                                         fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1);
3498                                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3499                                         if (abort_flag) {
3500                                                 return (1);
3501                                         }
3502                                         stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1);
3503                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3504                                                 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3505                                         }
3506                                         stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map;
3507                                         stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn);
3508                                         memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size);
3509
3510                                         /*
3511                                          * EY 05/13/08 - nr_sack: to keep
3512                                          * nr_mapping array be consistent
3513                                          * with mapping_array
3514                                          */
3515                                         if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off) && stcb->asoc.peer_supports_nr_sack) {
3516                                                 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map;
3517                                                 stcb->asoc.nr_mapping_array_base_tsn = stcb->asoc.mapping_array_base_tsn;
3518                                                 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.nr_mapping_array_size);
3519                                         }
3520                                         stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn);
3521                                         stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn;
3522
3523                                         sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL);
3524                                         sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL);
3525
3526                                 }
3527                         }
3528                         /* get rid of the request and get the request flags */
3529                         if (asoc->stream_reset_outstanding == 0) {
3530                                 sctp_clean_up_stream_reset(stcb);
3531                         }
3532                 }
3533         }
3534         return (0);
3535 }
3536
3537 static void
3538 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb,
3539     struct sctp_tmit_chunk *chk,
3540     struct sctp_stream_reset_in_request *req, int trunc)
3541 {
3542         uint32_t seq;
3543         int len, i;
3544         int number_entries;
3545         uint16_t temp;
3546
3547         /*
3548          * peer wants me to send a str-reset to him for my outgoing seq's if
3549          * seq_in is right.
3550          */
3551         struct sctp_association *asoc = &stcb->asoc;
3552
3553         seq = ntohl(req->request_seq);
3554         if (asoc->str_reset_seq_in == seq) {
3555                 if (trunc) {
3556                         /* Can't do it, since they exceeded our buffer size  */
3557                         asoc->last_reset_action[1] = asoc->last_reset_action[0];
3558                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_DENIED;
3559                         sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3560                 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) {
3561                         len = ntohs(req->ph.param_length);
3562                         number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t));
3563                         for (i = 0; i < number_entries; i++) {
3564                                 temp = ntohs(req->list_of_streams[i]);
3565                                 req->list_of_streams[i] = temp;
3566                         }
3567                         /* move the reset action back one */
3568                         asoc->last_reset_action[1] = asoc->last_reset_action[0];
3569                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED;
3570                         sctp_add_stream_reset_out(chk, number_entries, req->list_of_streams,
3571                             asoc->str_reset_seq_out,
3572                             seq, (asoc->sending_seq - 1));
3573                         asoc->stream_reset_out_is_outstanding = 1;
3574                         asoc->str_reset = chk;
3575                         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
3576                         stcb->asoc.stream_reset_outstanding++;
3577                 } else {
3578                         /* Can't do it, since we have sent one out */
3579                         asoc->last_reset_action[1] = asoc->last_reset_action[0];
3580                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_TRY_LATER;
3581                         sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3582                 }
3583                 asoc->str_reset_seq_in++;
3584         } else if (asoc->str_reset_seq_in - 1 == seq) {
3585                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3586         } else if (asoc->str_reset_seq_in - 2 == seq) {
3587                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3588         } else {
3589                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO);
3590         }
3591 }
3592
3593 static int
3594 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb,
3595     struct sctp_tmit_chunk *chk,
3596     struct sctp_stream_reset_tsn_request *req)
3597 {
3598         /* reset all in and out and update the tsn */
3599         /*
3600          * A) reset my str-seq's on in and out. B) Select a receive next,
3601          * and set cum-ack to it. Also process this selected number as a
3602          * fwd-tsn as well. C) set in the response my next sending seq.
3603          */
3604         struct sctp_forward_tsn_chunk fwdtsn;
3605         struct sctp_association *asoc = &stcb->asoc;
3606         int abort_flag = 0;
3607         uint32_t seq;
3608
3609         seq = ntohl(req->request_seq);
3610         if (asoc->str_reset_seq_in == seq) {
3611                 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3612                 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3613                 fwdtsn.ch.chunk_flags = 0;
3614                 fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1);
3615                 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3616                 if (abort_flag) {
3617                         return (1);
3618                 }
3619                 stcb->asoc.highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA;
3620                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3621                         sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3622                 }
3623                 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map;
3624                 stcb->asoc.mapping_array_base_tsn = stcb->asoc.highest_tsn_inside_map + 1;
3625                 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size);
3626                 /*
3627                  * EY 05/13/08 -nr_sack: to keep nr_mapping array consistent
3628                  * with mapping array
3629                  */
3630                 if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off) && stcb->asoc.peer_supports_nr_sack) {
3631                         stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map;
3632                         stcb->asoc.nr_mapping_array_base_tsn = stcb->asoc.highest_tsn_inside_map + 1;
3633                         memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.nr_mapping_array_size);
3634                 }
3635                 atomic_add_int(&stcb->asoc.sending_seq, 1);
3636                 /* save off historical data for retrans */
3637                 stcb->asoc.last_sending_seq[1] = stcb->asoc.last_sending_seq[0];
3638                 stcb->asoc.last_sending_seq[0] = stcb->asoc.sending_seq;
3639                 stcb->asoc.last_base_tsnsent[1] = stcb->asoc.last_base_tsnsent[0];
3640                 stcb->asoc.last_base_tsnsent[0] = stcb->asoc.mapping_array_base_tsn;
3641
3642                 sctp_add_stream_reset_result_tsn(chk,
3643                     ntohl(req->request_seq),
3644                     SCTP_STREAM_RESET_PERFORMED,
3645                     stcb->asoc.sending_seq,
3646                     stcb->asoc.mapping_array_base_tsn);
3647                 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL);
3648                 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL);
3649                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
3650                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED;
3651
3652                 asoc->str_reset_seq_in++;
3653         } else if (asoc->str_reset_seq_in - 1 == seq) {
3654                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3655                     stcb->asoc.last_sending_seq[0],
3656                     stcb->asoc.last_base_tsnsent[0]
3657                     );
3658         } else if (asoc->str_reset_seq_in - 2 == seq) {
3659                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1],
3660                     stcb->asoc.last_sending_seq[1],
3661                     stcb->asoc.last_base_tsnsent[1]
3662                     );
3663         } else {
3664                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO);
3665         }
3666         return (0);
3667 }
3668
3669 static void
3670 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb,
3671     struct sctp_tmit_chunk *chk,
3672     struct sctp_stream_reset_out_request *req, int trunc)
3673 {
3674         uint32_t seq, tsn;
3675         int number_entries, len;
3676         struct sctp_association *asoc = &stcb->asoc;
3677
3678         seq = ntohl(req->request_seq);
3679
3680         /* now if its not a duplicate we process it */
3681         if (asoc->str_reset_seq_in == seq) {
3682                 len = ntohs(req->ph.param_length);
3683                 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t));
3684                 /*
3685                  * the sender is resetting, handle the list issue.. we must
3686                  * a) verify if we can do the reset, if so no problem b) If
3687                  * we can't do the reset we must copy the request. c) queue
3688                  * it, and setup the data in processor to trigger it off
3689                  * when needed and dequeue all the queued data.
3690                  */
3691                 tsn = ntohl(req->send_reset_at_tsn);
3692
3693                 /* move the reset action back one */
3694                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3695                 if (trunc) {
3696                         sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_DENIED);
3697                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_DENIED;
3698                 } else if ((tsn == asoc->cumulative_tsn) ||
3699                     (compare_with_wrap(asoc->cumulative_tsn, tsn, MAX_TSN))) {
3700                         /* we can do it now */
3701                         sctp_reset_in_stream(stcb, number_entries, req->list_of_streams);
3702                         sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_PERFORMED);
3703                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED;
3704                 } else {
3705                         /*
3706                          * we must queue it up and thus wait for the TSN's
3707                          * to arrive that are at or before tsn
3708                          */
3709                         struct sctp_stream_reset_list *liste;
3710                         int siz;
3711
3712                         siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t));
3713                         SCTP_MALLOC(liste, struct sctp_stream_reset_list *,
3714                             siz, SCTP_M_STRESET);
3715                         if (liste == NULL) {
3716                                 /* gak out of memory */
3717                                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_DENIED);
3718                                 asoc->last_reset_action[0] = SCTP_STREAM_RESET_DENIED;
3719                                 return;
3720                         }
3721                         liste->tsn = tsn;
3722                         liste->number_entries = number_entries;
3723                         memcpy(&liste->req, req,
3724                             (sizeof(struct sctp_stream_reset_out_request) + (number_entries * sizeof(uint16_t))));
3725                         TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp);
3726                         sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_PERFORMED);
3727                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED;
3728                 }
3729                 asoc->str_reset_seq_in++;
3730         } else if ((asoc->str_reset_seq_in - 1) == seq) {
3731                 /*
3732                  * one seq back, just echo back last action since my
3733                  * response was lost.
3734                  */
3735                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3736         } else if ((asoc->str_reset_seq_in - 2) == seq) {
3737                 /*
3738                  * two seq back, just echo back last action since my
3739                  * response was lost.
3740                  */
3741                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3742         } else {
3743                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO);
3744         }
3745 }
3746
3747 static void
3748 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
3749     struct sctp_stream_reset_add_strm *str_add)
3750 {
3751         /*
3752          * Peer is requesting to add more streams. If its within our
3753          * max-streams we will allow it.
3754          */
3755         uint16_t num_stream, i;
3756         uint32_t seq;
3757         struct sctp_association *asoc = &stcb->asoc;
3758         struct sctp_queued_to_read *ctl;
3759
3760         /* Get the number. */
3761         seq = ntohl(str_add->request_seq);
3762         num_stream = ntohs(str_add->number_of_streams);
3763         /* Now what would be the new total? */
3764         if (asoc->str_reset_seq_in == seq) {
3765                 num_stream += stcb->asoc.streamincnt;
3766                 if (num_stream > stcb->asoc.max_inbound_streams) {
3767                         /* We must reject it they ask for to many */
3768         denied:
3769                         sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_DENIED);
3770                         stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
3771                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_DENIED;
3772                 } else {
3773                         /* Ok, we can do that :-) */
3774                         struct sctp_stream_in *oldstrm;
3775
3776                         /* save off the old */
3777                         oldstrm = stcb->asoc.strmin;
3778                         SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *,
3779                             (num_stream * sizeof(struct sctp_stream_in)),
3780                             SCTP_M_STRMI);
3781                         if (stcb->asoc.strmin == NULL) {
3782                                 stcb->asoc.strmin = oldstrm;
3783                                 goto denied;
3784                         }
3785                         /* copy off the old data */
3786                         for (i = 0; i < stcb->asoc.streamincnt; i++) {
3787                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
3788                                 stcb->asoc.strmin[i].stream_no = i;
3789                                 stcb->asoc.strmin[i].last_sequence_delivered = oldstrm[i].last_sequence_delivered;
3790                                 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started;
3791                                 /* now anything on those queues? */
3792                                 while (TAILQ_EMPTY(&oldstrm[i].inqueue) == 0) {
3793                                         ctl = TAILQ_FIRST(&oldstrm[i].inqueue);
3794                                         TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next);
3795                                         TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next);
3796                                 }
3797                         }
3798                         /* Init the new streams */
3799                         for (i = stcb->asoc.streamincnt; i < num_stream; i++) {
3800                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
3801                                 stcb->asoc.strmin[i].stream_no = i;
3802                                 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff;
3803                                 stcb->asoc.strmin[i].delivery_started = 0;
3804                         }
3805                         SCTP_FREE(oldstrm, SCTP_M_STRMI);
3806                         /* update the size */
3807                         stcb->asoc.streamincnt = num_stream;
3808                         /* Send the ack */
3809                         sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_PERFORMED);
3810                         stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
3811                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED;
3812                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_INSTREAM_ADD_OK, stcb,
3813                             (uint32_t) stcb->asoc.streamincnt, NULL, SCTP_SO_NOT_LOCKED);
3814                 }
3815         } else if ((asoc->str_reset_seq_in - 1) == seq) {
3816                 /*
3817                  * one seq back, just echo back last action since my
3818                  * response was lost.
3819                  */
3820                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3821         } else if ((asoc->str_reset_seq_in - 2) == seq) {
3822                 /*
3823                  * two seq back, just echo back last action since my
3824                  * response was lost.
3825                  */
3826                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3827         } else {
3828                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO);
3829
3830         }
3831 }
3832
3833 #ifdef __GNUC__
3834 __attribute__((noinline))
3835 #endif
3836         static int
3837             sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset,
3838         struct sctp_stream_reset_out_req *sr_req)
3839 {
3840         int chk_length, param_len, ptype;
3841         struct sctp_paramhdr pstore;
3842         uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE];
3843
3844         uint32_t seq;
3845         int num_req = 0;
3846         int trunc = 0;
3847         struct sctp_tmit_chunk *chk;
3848         struct sctp_chunkhdr *ch;
3849         struct sctp_paramhdr *ph;
3850         int ret_code = 0;
3851         int num_param = 0;
3852
3853         /* now it may be a reset or a reset-response */
3854         chk_length = ntohs(sr_req->ch.chunk_length);
3855
3856         /* setup for adding the response */
3857         sctp_alloc_a_chunk(stcb, chk);
3858         if (chk == NULL) {
3859                 return (ret_code);
3860         }
3861         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
3862         chk->rec.chunk_id.can_take_data = 0;
3863         chk->asoc = &stcb->asoc;
3864         chk->no_fr_allowed = 0;
3865         chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr);
3866         chk->book_size_scale = 0;
3867         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
3868         if (chk->data == NULL) {
3869 strres_nochunk:
3870                 if (chk->data) {
3871                         sctp_m_freem(chk->data);
3872                         chk->data = NULL;
3873                 }
3874                 sctp_free_a_chunk(stcb, chk);
3875                 return (ret_code);
3876         }
3877         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
3878
3879         /* setup chunk parameters */
3880         chk->sent = SCTP_DATAGRAM_UNSENT;
3881         chk->snd_count = 0;
3882         chk->whoTo = stcb->asoc.primary_destination;
3883         atomic_add_int(&chk->whoTo->ref_count, 1);
3884
3885         ch = mtod(chk->data, struct sctp_chunkhdr *);
3886         ch->chunk_type = SCTP_STREAM_RESET;
3887         ch->chunk_flags = 0;
3888         ch->chunk_length = htons(chk->send_size);
3889         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
3890         offset += sizeof(struct sctp_chunkhdr);
3891         while ((size_t)chk_length >= sizeof(struct sctp_stream_reset_tsn_request)) {
3892                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *) & pstore);
3893                 if (ph == NULL)
3894                         break;
3895                 param_len = ntohs(ph->param_length);
3896                 if (param_len < (int)sizeof(struct sctp_stream_reset_tsn_request)) {
3897                         /* bad param */
3898                         break;
3899                 }
3900                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, (int)sizeof(cstore)),
3901                     (uint8_t *) & cstore);
3902                 ptype = ntohs(ph->param_type);
3903                 num_param++;
3904                 if (param_len > (int)sizeof(cstore)) {
3905                         trunc = 1;
3906                 } else {
3907                         trunc = 0;
3908                 }
3909
3910                 if (num_param > SCTP_MAX_RESET_PARAMS) {
3911                         /* hit the max of parameters already sorry.. */
3912                         break;
3913                 }
3914                 if (ptype == SCTP_STR_RESET_OUT_REQUEST) {
3915                         struct sctp_stream_reset_out_request *req_out;
3916
3917                         req_out = (struct sctp_stream_reset_out_request *)ph;
3918                         num_req++;
3919                         if (stcb->asoc.stream_reset_outstanding) {
3920                                 seq = ntohl(req_out->response_seq);
3921                                 if (seq == stcb->asoc.str_reset_seq_out) {
3922                                         /* implicit ack */
3923                                         (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_PERFORMED, NULL);
3924                                 }
3925                         }
3926                         sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc);
3927                 } else if (ptype == SCTP_STR_RESET_ADD_STREAMS) {
3928                         struct sctp_stream_reset_add_strm *str_add;
3929
3930                         str_add = (struct sctp_stream_reset_add_strm *)ph;
3931                         num_req++;
3932                         sctp_handle_str_reset_add_strm(stcb, chk, str_add);
3933                 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) {
3934                         struct sctp_stream_reset_in_request *req_in;
3935
3936                         num_req++;
3937
3938                         req_in = (struct sctp_stream_reset_in_request *)ph;
3939
3940                         sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc);
3941                 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) {
3942                         struct sctp_stream_reset_tsn_request *req_tsn;
3943
3944                         num_req++;
3945                         req_tsn = (struct sctp_stream_reset_tsn_request *)ph;
3946
3947                         if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) {
3948                                 ret_code = 1;
3949                                 goto strres_nochunk;
3950                         }
3951                         /* no more */
3952                         break;
3953                 } else if (ptype == SCTP_STR_RESET_RESPONSE) {
3954                         struct sctp_stream_reset_response *resp;
3955                         uint32_t result;
3956
3957                         resp = (struct sctp_stream_reset_response *)ph;
3958                         seq = ntohl(resp->response_seq);
3959                         result = ntohl(resp->result);
3960                         if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) {
3961                                 ret_code = 1;
3962                                 goto strres_nochunk;
3963                         }
3964                 } else {
3965                         break;
3966                 }
3967                 offset += SCTP_SIZE32(param_len);
3968                 chk_length -= SCTP_SIZE32(param_len);
3969         }
3970         if (num_req == 0) {
3971                 /* we have no response free the stuff */
3972                 goto strres_nochunk;
3973         }
3974         /* ok we have a chunk to link in */
3975         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue,
3976             chk,
3977             sctp_next);
3978         stcb->asoc.ctrl_queue_cnt++;
3979         return (ret_code);
3980 }
3981
3982 /*
3983  * Handle a router or endpoints report of a packet loss, there are two ways
3984  * to handle this, either we get the whole packet and must disect it
3985  * ourselves (possibly with truncation and or corruption) or it is a summary
3986  * from a middle box that did the disectting for us.
3987  */
3988 static void
3989 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp,
3990     struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit)
3991 {
3992         uint32_t bottle_bw, on_queue;
3993         uint16_t trunc_len;
3994         unsigned int chlen;
3995         unsigned int at;
3996         struct sctp_chunk_desc desc;
3997         struct sctp_chunkhdr *ch;
3998
3999         chlen = ntohs(cp->ch.chunk_length);
4000         chlen -= sizeof(struct sctp_pktdrop_chunk);
4001         /* XXX possible chlen underflow */
4002         if (chlen == 0) {
4003                 ch = NULL;
4004                 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)
4005                         SCTP_STAT_INCR(sctps_pdrpbwrpt);
4006         } else {
4007                 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr));
4008                 chlen -= sizeof(struct sctphdr);
4009                 /* XXX possible chlen underflow */
4010                 memset(&desc, 0, sizeof(desc));
4011         }
4012         trunc_len = (uint16_t) ntohs(cp->trunc_len);
4013         if (trunc_len > limit) {
4014                 trunc_len = limit;
4015         }
4016         /* now the chunks themselves */
4017         while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) {
4018                 desc.chunk_type = ch->chunk_type;
4019                 /* get amount we need to move */
4020                 at = ntohs(ch->chunk_length);
4021                 if (at < sizeof(struct sctp_chunkhdr)) {
4022                         /* corrupt chunk, maybe at the end? */
4023                         SCTP_STAT_INCR(sctps_pdrpcrupt);
4024                         break;
4025                 }
4026                 if (trunc_len == 0) {
4027                         /* we are supposed to have all of it */
4028                         if (at > chlen) {
4029                                 /* corrupt skip it */
4030                                 SCTP_STAT_INCR(sctps_pdrpcrupt);
4031                                 break;
4032                         }
4033                 } else {
4034                         /* is there enough of it left ? */
4035                         if (desc.chunk_type == SCTP_DATA) {
4036                                 if (chlen < (sizeof(struct sctp_data_chunk) +
4037                                     sizeof(desc.data_bytes))) {
4038                                         break;
4039                                 }
4040                         } else {
4041                                 if (chlen < sizeof(struct sctp_chunkhdr)) {
4042                                         break;
4043                                 }
4044                         }
4045                 }
4046                 if (desc.chunk_type == SCTP_DATA) {
4047                         /* can we get out the tsn? */
4048                         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
4049                                 SCTP_STAT_INCR(sctps_pdrpmbda);
4050
4051                         if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) {
4052                                 /* yep */
4053                                 struct sctp_data_chunk *dcp;
4054                                 uint8_t *ddp;
4055                                 unsigned int iii;
4056
4057                                 dcp = (struct sctp_data_chunk *)ch;
4058                                 ddp = (uint8_t *) (dcp + 1);
4059                                 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) {
4060                                         desc.data_bytes[iii] = ddp[iii];
4061                                 }
4062                                 desc.tsn_ifany = dcp->dp.tsn;
4063                         } else {
4064                                 /* nope we are done. */
4065                                 SCTP_STAT_INCR(sctps_pdrpnedat);
4066                                 break;
4067                         }
4068                 } else {
4069                         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
4070                                 SCTP_STAT_INCR(sctps_pdrpmbct);
4071                 }
4072
4073                 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) {
4074                         SCTP_STAT_INCR(sctps_pdrppdbrk);
4075                         break;
4076                 }
4077                 if (SCTP_SIZE32(at) > chlen) {
4078                         break;
4079                 }
4080                 chlen -= SCTP_SIZE32(at);
4081                 if (chlen < sizeof(struct sctp_chunkhdr)) {
4082                         /* done, none left */
4083                         break;
4084                 }
4085                 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at));
4086         }
4087         /* Now update any rwnd --- possibly */
4088         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) {
4089                 /* From a peer, we get a rwnd report */
4090                 uint32_t a_rwnd;
4091
4092                 SCTP_STAT_INCR(sctps_pdrpfehos);
4093
4094                 bottle_bw = ntohl(cp->bottle_bw);
4095                 on_queue = ntohl(cp->current_onq);
4096                 if (bottle_bw && on_queue) {
4097                         /* a rwnd report is in here */
4098                         if (bottle_bw > on_queue)
4099                                 a_rwnd = bottle_bw - on_queue;
4100                         else
4101                                 a_rwnd = 0;
4102
4103                         if (a_rwnd == 0)
4104                                 stcb->asoc.peers_rwnd = 0;
4105                         else {
4106                                 if (a_rwnd > stcb->asoc.total_flight) {
4107                                         stcb->asoc.peers_rwnd =
4108                                             a_rwnd - stcb->asoc.total_flight;
4109                                 } else {
4110                                         stcb->asoc.peers_rwnd = 0;
4111                                 }
4112                                 if (stcb->asoc.peers_rwnd <
4113                                     stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
4114                                         /* SWS sender side engages */
4115                                         stcb->asoc.peers_rwnd = 0;
4116                                 }
4117                         }
4118                 }
4119         } else {
4120                 SCTP_STAT_INCR(sctps_pdrpfmbox);
4121         }
4122
4123         /* now middle boxes in sat networks get a cwnd bump */
4124         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) &&
4125             (stcb->asoc.sat_t3_loss_recovery == 0) &&
4126             (stcb->asoc.sat_network)) {
4127                 /*
4128                  * This is debateable but for sat networks it makes sense
4129                  * Note if a T3 timer has went off, we will prohibit any
4130                  * changes to cwnd until we exit the t3 loss recovery.
4131                  */
4132                 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb,
4133                     net, cp, &bottle_bw, &on_queue);
4134         }
4135 }
4136
4137 /*
4138  * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to
4139  * still contain IP/SCTP header - stcb: is the tcb found for this packet -
4140  * offset: offset into the mbuf chain to first chunkhdr - length: is the
4141  * length of the complete packet outputs: - length: modified to remaining
4142  * length after control processing - netp: modified to new sctp_nets after
4143  * cookie-echo processing - return NULL to discard the packet (ie. no asoc,
4144  * bad packet,...) otherwise return the tcb for this packet
4145  */
4146 #ifdef __GNUC__
4147 __attribute__((noinline))
4148 #endif
4149         static struct sctp_tcb *
4150                  sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length,
4151              struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp,
4152              struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen,
4153              uint32_t vrf_id, uint16_t port)
4154 {
4155         struct sctp_association *asoc;
4156         uint32_t vtag_in;
4157         int num_chunks = 0;     /* number of control chunks processed */
4158         uint32_t chk_length;
4159         int ret;
4160         int abort_no_unlock = 0;
4161
4162         /*
4163          * How big should this be, and should it be alloc'd? Lets try the
4164          * d-mtu-ceiling for now (2k) and that should hopefully work ...
4165          * until we get into jumbo grams and such..
4166          */
4167         uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE];
4168         struct sctp_tcb *locked_tcb = stcb;
4169         int got_auth = 0;
4170         uint32_t auth_offset = 0, auth_len = 0;
4171         int auth_skipped = 0;
4172         int asconf_cnt = 0;
4173
4174 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4175         struct socket *so;
4176
4177 #endif
4178
4179         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n",
4180             iphlen, *offset, length, stcb);
4181
4182         /* validate chunk header length... */
4183         if (ntohs(ch->chunk_length) < sizeof(*ch)) {
4184                 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n",
4185                     ntohs(ch->chunk_length));
4186                 if (locked_tcb) {
4187                         SCTP_TCB_UNLOCK(locked_tcb);
4188                 }
4189                 return (NULL);
4190         }
4191         /*
4192          * validate the verification tag
4193          */
4194         vtag_in = ntohl(sh->v_tag);
4195
4196         if (locked_tcb) {
4197                 SCTP_TCB_LOCK_ASSERT(locked_tcb);
4198         }
4199         if (ch->chunk_type == SCTP_INITIATION) {
4200                 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n",
4201                     ntohs(ch->chunk_length), vtag_in);
4202                 if (vtag_in != 0) {
4203                         /* protocol error- silently discard... */
4204                         SCTP_STAT_INCR(sctps_badvtag);
4205                         if (locked_tcb) {
4206                                 SCTP_TCB_UNLOCK(locked_tcb);
4207                         }
4208                         return (NULL);
4209                 }
4210         } else if (ch->chunk_type != SCTP_COOKIE_ECHO) {
4211                 /*
4212                  * If there is no stcb, skip the AUTH chunk and process
4213                  * later after a stcb is found (to validate the lookup was
4214                  * valid.
4215                  */
4216                 if ((ch->chunk_type == SCTP_AUTHENTICATION) &&
4217                     (stcb == NULL) &&
4218                     !SCTP_BASE_SYSCTL(sctp_auth_disable)) {
4219                         /* save this chunk for later processing */
4220                         auth_skipped = 1;
4221                         auth_offset = *offset;
4222                         auth_len = ntohs(ch->chunk_length);
4223
4224                         /* (temporarily) move past this chunk */
4225                         *offset += SCTP_SIZE32(auth_len);
4226                         if (*offset >= length) {
4227                                 /* no more data left in the mbuf chain */
4228                                 *offset = length;
4229                                 if (locked_tcb) {
4230                                         SCTP_TCB_UNLOCK(locked_tcb);
4231                                 }
4232                                 return (NULL);
4233                         }
4234                         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4235                             sizeof(struct sctp_chunkhdr), chunk_buf);
4236                 }
4237                 if (ch == NULL) {
4238                         /* Help */
4239                         *offset = length;
4240                         if (locked_tcb) {
4241                                 SCTP_TCB_UNLOCK(locked_tcb);
4242                         }
4243                         return (NULL);
4244                 }
4245                 if (ch->chunk_type == SCTP_COOKIE_ECHO) {
4246                         goto process_control_chunks;
4247                 }
4248                 /*
4249                  * first check if it's an ASCONF with an unknown src addr we
4250                  * need to look inside to find the association
4251                  */
4252                 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) {
4253                         struct sctp_chunkhdr *asconf_ch = ch;
4254                         uint32_t asconf_offset = 0, asconf_len = 0;
4255
4256                         /* inp's refcount may be reduced */
4257                         SCTP_INP_INCR_REF(inp);
4258
4259                         asconf_offset = *offset;
4260                         do {
4261                                 asconf_len = ntohs(asconf_ch->chunk_length);
4262                                 if (asconf_len < sizeof(struct sctp_asconf_paramhdr))
4263                                         break;
4264                                 stcb = sctp_findassociation_ep_asconf(m, iphlen,
4265                                     *offset, sh, &inp, netp, vrf_id);
4266                                 if (stcb != NULL)
4267                                         break;
4268                                 asconf_offset += SCTP_SIZE32(asconf_len);
4269                                 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset,
4270                                     sizeof(struct sctp_chunkhdr), chunk_buf);
4271                         } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF);
4272                         if (stcb == NULL) {
4273                                 /*
4274                                  * reduce inp's refcount if not reduced in
4275                                  * sctp_findassociation_ep_asconf().
4276                                  */
4277                                 SCTP_INP_DECR_REF(inp);
4278                         } else {
4279                                 locked_tcb = stcb;
4280                         }
4281
4282                         /* now go back and verify any auth chunk to be sure */
4283                         if (auth_skipped && (stcb != NULL)) {
4284                                 struct sctp_auth_chunk *auth;
4285
4286                                 auth = (struct sctp_auth_chunk *)
4287                                     sctp_m_getptr(m, auth_offset,
4288                                     auth_len, chunk_buf);
4289                                 got_auth = 1;
4290                                 auth_skipped = 0;
4291                                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m,
4292                                     auth_offset)) {
4293                                         /* auth HMAC failed so dump it */
4294                                         *offset = length;
4295                                         if (locked_tcb) {
4296                                                 SCTP_TCB_UNLOCK(locked_tcb);
4297                                         }
4298                                         return (NULL);
4299                                 } else {
4300                                         /* remaining chunks are HMAC checked */
4301                                         stcb->asoc.authenticated = 1;
4302                                 }
4303                         }
4304                 }
4305                 if (stcb == NULL) {
4306                         /* no association, so it's out of the blue... */
4307                         sctp_handle_ootb(m, iphlen, *offset, sh, inp, NULL,
4308                             vrf_id, port);
4309                         *offset = length;
4310                         if (locked_tcb) {
4311                                 SCTP_TCB_UNLOCK(locked_tcb);
4312                         }
4313                         return (NULL);
4314                 }
4315                 asoc = &stcb->asoc;
4316                 /* ABORT and SHUTDOWN can use either v_tag... */
4317                 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) ||
4318                     (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) ||
4319                     (ch->chunk_type == SCTP_PACKET_DROPPED)) {
4320                         if ((vtag_in == asoc->my_vtag) ||
4321                             ((ch->chunk_flags & SCTP_HAD_NO_TCB) &&
4322                             (vtag_in == asoc->peer_vtag))) {
4323                                 /* this is valid */
4324                         } else {
4325                                 /* drop this packet... */
4326                                 SCTP_STAT_INCR(sctps_badvtag);
4327                                 if (locked_tcb) {
4328                                         SCTP_TCB_UNLOCK(locked_tcb);
4329                                 }
4330                                 return (NULL);
4331                         }
4332                 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
4333                         if (vtag_in != asoc->my_vtag) {
4334                                 /*
4335                                  * this could be a stale SHUTDOWN-ACK or the
4336                                  * peer never got the SHUTDOWN-COMPLETE and
4337                                  * is still hung; we have started a new asoc
4338                                  * but it won't complete until the shutdown
4339                                  * is completed
4340                                  */
4341                                 if (locked_tcb) {
4342                                         SCTP_TCB_UNLOCK(locked_tcb);
4343                                 }
4344                                 sctp_handle_ootb(m, iphlen, *offset, sh, inp,
4345                                     NULL, vrf_id, port);
4346                                 return (NULL);
4347                         }
4348                 } else {
4349                         /* for all other chunks, vtag must match */
4350                         if (vtag_in != asoc->my_vtag) {
4351                                 /* invalid vtag... */
4352                                 SCTPDBG(SCTP_DEBUG_INPUT3,
4353                                     "invalid vtag: %xh, expect %xh\n",
4354                                     vtag_in, asoc->my_vtag);
4355                                 SCTP_STAT_INCR(sctps_badvtag);
4356                                 if (locked_tcb) {
4357                                         SCTP_TCB_UNLOCK(locked_tcb);
4358                                 }
4359                                 *offset = length;
4360                                 return (NULL);
4361                         }
4362                 }
4363         }                       /* end if !SCTP_COOKIE_ECHO */
4364         /*
4365          * process all control chunks...
4366          */
4367         if (((ch->chunk_type == SCTP_SELECTIVE_ACK) ||
4368         /* EY */
4369             (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) ||
4370             (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) &&
4371             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) {
4372                 /* implied cookie-ack.. we must have lost the ack */
4373                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
4374                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
4375                             stcb->asoc.overall_error_count,
4376                             0,
4377                             SCTP_FROM_SCTP_INPUT,
4378                             __LINE__);
4379                 }
4380                 stcb->asoc.overall_error_count = 0;
4381                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb,
4382                     *netp);
4383         }
4384 process_control_chunks:
4385         while (IS_SCTP_CONTROL(ch)) {
4386                 /* validate chunk length */
4387                 chk_length = ntohs(ch->chunk_length);
4388                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n",
4389                     ch->chunk_type, chk_length);
4390                 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length);
4391                 if (chk_length < sizeof(*ch) ||
4392                     (*offset + (int)chk_length) > length) {
4393                         *offset = length;
4394                         if (locked_tcb) {
4395                                 SCTP_TCB_UNLOCK(locked_tcb);
4396                         }
4397                         return (NULL);
4398                 }
4399                 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks);
4400                 /*
4401                  * INIT-ACK only gets the init ack "header" portion only
4402                  * because we don't have to process the peer's COOKIE. All
4403                  * others get a complete chunk.
4404                  */
4405                 if ((ch->chunk_type == SCTP_INITIATION_ACK) ||
4406                     (ch->chunk_type == SCTP_INITIATION)) {
4407                         /* get an init-ack chunk */
4408                         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4409                             sizeof(struct sctp_init_ack_chunk), chunk_buf);
4410                         if (ch == NULL) {
4411                                 *offset = length;
4412                                 if (locked_tcb) {
4413                                         SCTP_TCB_UNLOCK(locked_tcb);
4414                                 }
4415                                 return (NULL);
4416                         }
4417                 } else {
4418                         /* For cookies and all other chunks. */
4419                         if (chk_length > sizeof(chunk_buf)) {
4420                                 /*
4421                                  * use just the size of the chunk buffer so
4422                                  * the front part of our chunks fit in
4423                                  * contiguous space up to the chunk buffer
4424                                  * size (508 bytes). For chunks that need to
4425                                  * get more than that they must use the
4426                                  * sctp_m_getptr() function or other means
4427                                  * (e.g. know how to parse mbuf chains).
4428                                  * Cookies do this already.
4429                                  */
4430                                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4431                                     (sizeof(chunk_buf) - 4),
4432                                     chunk_buf);
4433                                 if (ch == NULL) {
4434                                         *offset = length;
4435                                         if (locked_tcb) {
4436                                                 SCTP_TCB_UNLOCK(locked_tcb);
4437                                         }
4438                                         return (NULL);
4439                                 }
4440                         } else {
4441                                 /* We can fit it all */
4442                                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4443                                     chk_length, chunk_buf);
4444                                 if (ch == NULL) {
4445                                         SCTP_PRINTF("sctp_process_control: Can't get the all data....\n");
4446                                         *offset = length;
4447                                         if (locked_tcb) {
4448                                                 SCTP_TCB_UNLOCK(locked_tcb);
4449                                         }
4450                                         return (NULL);
4451                                 }
4452                         }
4453                 }
4454                 num_chunks++;
4455                 /* Save off the last place we got a control from */
4456                 if (stcb != NULL) {
4457                         if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) {
4458                                 /*
4459                                  * allow last_control to be NULL if
4460                                  * ASCONF... ASCONF processing will find the
4461                                  * right net later
4462                                  */
4463                                 if ((netp != NULL) && (*netp != NULL))
4464                                         stcb->asoc.last_control_chunk_from = *netp;
4465                         }
4466                 }
4467 #ifdef SCTP_AUDITING_ENABLED
4468                 sctp_audit_log(0xB0, ch->chunk_type);
4469 #endif
4470
4471                 /* check to see if this chunk required auth, but isn't */
4472                 if ((stcb != NULL) &&
4473                     !SCTP_BASE_SYSCTL(sctp_auth_disable) &&
4474                     sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) &&
4475                     !stcb->asoc.authenticated) {
4476                         /* "silently" ignore */
4477                         SCTP_STAT_INCR(sctps_recvauthmissing);
4478                         goto next_chunk;
4479                 }
4480                 switch (ch->chunk_type) {
4481                 case SCTP_INITIATION:
4482                         /* must be first and only chunk */
4483                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n");
4484                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4485                                 /* We are not interested anymore? */
4486                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
4487                                         /*
4488                                          * collision case where we are
4489                                          * sending to them too
4490                                          */
4491                                         ;
4492                                 } else {
4493                                         if (locked_tcb) {
4494                                                 SCTP_TCB_UNLOCK(locked_tcb);
4495                                         }
4496                                         *offset = length;
4497                                         return (NULL);
4498                                 }
4499                         }
4500                         if ((chk_length > SCTP_LARGEST_INIT_ACCEPTED) ||
4501                             (num_chunks > 1) ||
4502                             (SCTP_BASE_SYSCTL(sctp_strict_init) && (length - *offset > (int)SCTP_SIZE32(chk_length)))) {
4503                                 *offset = length;
4504                                 if (locked_tcb) {
4505                                         SCTP_TCB_UNLOCK(locked_tcb);
4506                                 }
4507                                 return (NULL);
4508                         }
4509                         if ((stcb != NULL) &&
4510                             (SCTP_GET_STATE(&stcb->asoc) ==
4511                             SCTP_STATE_SHUTDOWN_ACK_SENT)) {
4512                                 sctp_send_shutdown_ack(stcb,
4513                                     stcb->asoc.primary_destination);
4514                                 *offset = length;
4515                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
4516                                 if (locked_tcb) {
4517                                         SCTP_TCB_UNLOCK(locked_tcb);
4518                                 }
4519                                 return (NULL);
4520                         }
4521                         if (netp) {
4522                                 sctp_handle_init(m, iphlen, *offset, sh,
4523                                     (struct sctp_init_chunk *)ch, inp,
4524                                     stcb, *netp, &abort_no_unlock, vrf_id, port);
4525                         }
4526                         if (abort_no_unlock)
4527                                 return (NULL);
4528
4529                         *offset = length;
4530                         if (locked_tcb) {
4531                                 SCTP_TCB_UNLOCK(locked_tcb);
4532                         }
4533                         return (NULL);
4534                         break;
4535                 case SCTP_PAD_CHUNK:
4536                         break;
4537                 case SCTP_INITIATION_ACK:
4538                         /* must be first and only chunk */
4539                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT-ACK\n");
4540                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4541                                 /* We are not interested anymore */
4542                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
4543                                         ;
4544                                 } else {
4545                                         if (locked_tcb) {
4546                                                 SCTP_TCB_UNLOCK(locked_tcb);
4547                                         }
4548                                         *offset = length;
4549                                         if (stcb) {
4550 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4551                                                 so = SCTP_INP_SO(inp);
4552                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4553                                                 SCTP_TCB_UNLOCK(stcb);
4554                                                 SCTP_SOCKET_LOCK(so, 1);
4555                                                 SCTP_TCB_LOCK(stcb);
4556                                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4557 #endif
4558                                                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27);
4559 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4560                                                 SCTP_SOCKET_UNLOCK(so, 1);
4561 #endif
4562                                         }
4563                                         return (NULL);
4564                                 }
4565                         }
4566                         if ((num_chunks > 1) ||
4567                             (SCTP_BASE_SYSCTL(sctp_strict_init) && (length - *offset > (int)SCTP_SIZE32(chk_length)))) {
4568                                 *offset = length;
4569                                 if (locked_tcb) {
4570                                         SCTP_TCB_UNLOCK(locked_tcb);
4571                                 }
4572                                 return (NULL);
4573                         }
4574                         if ((netp) && (*netp)) {
4575                                 ret = sctp_handle_init_ack(m, iphlen, *offset, sh,
4576                                     (struct sctp_init_ack_chunk *)ch, stcb, *netp, &abort_no_unlock, vrf_id);
4577                         } else {
4578                                 ret = -1;
4579                         }
4580                         /*
4581                          * Special case, I must call the output routine to
4582                          * get the cookie echoed
4583                          */
4584                         if (abort_no_unlock)
4585                                 return (NULL);
4586
4587                         if ((stcb) && ret == 0)
4588                                 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
4589                         *offset = length;
4590                         if (locked_tcb) {
4591                                 SCTP_TCB_UNLOCK(locked_tcb);
4592                         }
4593                         return (NULL);
4594                         break;
4595                 case SCTP_SELECTIVE_ACK:
4596                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK\n");
4597                         SCTP_STAT_INCR(sctps_recvsacks);
4598                         {
4599                                 struct sctp_sack_chunk *sack;
4600                                 int abort_now = 0;
4601                                 uint32_t a_rwnd, cum_ack;
4602                                 uint16_t num_seg;
4603                                 int nonce_sum_flag;
4604
4605                                 if ((stcb == NULL) || (chk_length < sizeof(struct sctp_sack_chunk))) {
4606                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on sack chunk, too small\n");
4607                                         *offset = length;
4608                                         if (locked_tcb) {
4609                                                 SCTP_TCB_UNLOCK(locked_tcb);
4610                                         }
4611                                         return (NULL);
4612                                 }
4613                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
4614                                         /*-
4615                                          * If we have sent a shutdown-ack, we will pay no
4616                                          * attention to a sack sent in to us since
4617                                          * we don't care anymore.
4618                                          */
4619                                         break;
4620                                 }
4621                                 sack = (struct sctp_sack_chunk *)ch;
4622                                 nonce_sum_flag = ch->chunk_flags & SCTP_SACK_NONCE_SUM;
4623                                 cum_ack = ntohl(sack->sack.cum_tsn_ack);
4624                                 num_seg = ntohs(sack->sack.num_gap_ack_blks);
4625                                 a_rwnd = (uint32_t) ntohl(sack->sack.a_rwnd);
4626                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n",
4627                                     cum_ack,
4628                                     num_seg,
4629                                     a_rwnd
4630                                     );
4631                                 stcb->asoc.seen_a_sack_this_pkt = 1;
4632                                 if ((stcb->asoc.pr_sctp_cnt == 0) &&
4633                                     (num_seg == 0) &&
4634                                     ((compare_with_wrap(cum_ack, stcb->asoc.last_acked_seq, MAX_TSN)) ||
4635                                     (cum_ack == stcb->asoc.last_acked_seq)) &&
4636                                     (stcb->asoc.saw_sack_with_frags == 0) &&
4637                                     (!TAILQ_EMPTY(&stcb->asoc.sent_queue))
4638                                     ) {
4639                                         /*
4640                                          * We have a SIMPLE sack having no
4641                                          * prior segments and data on sent
4642                                          * queue to be acked.. Use the
4643                                          * faster path sack processing. We
4644                                          * also allow window update sacks
4645                                          * with no missing segments to go
4646                                          * this way too.
4647                                          */
4648                                         sctp_express_handle_sack(stcb, cum_ack, a_rwnd, nonce_sum_flag,
4649                                             &abort_now);
4650                                 } else {
4651                                         if (netp && *netp)
4652                                                 sctp_handle_sack(m, *offset,
4653                                                     sack, stcb, *netp, &abort_now, chk_length, a_rwnd);
4654                                 }
4655                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
4656                                     TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
4657                                     (stcb->asoc.stream_queue_cnt == 0)) {
4658                                         sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
4659                                 }
4660                                 if (abort_now) {
4661                                         /* ABORT signal from sack processing */
4662                                         *offset = length;
4663                                         return (NULL);
4664                                 }
4665                         }
4666                         break;
4667                         /*
4668                          * EY - nr_sack:  If the received chunk is an
4669                          * nr_sack chunk
4670                          */
4671                 case SCTP_NR_SELECTIVE_ACK:
4672                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK\n");
4673                         SCTP_STAT_INCR(sctps_recvsacks);
4674                         {
4675                                 struct sctp_nr_sack_chunk *nr_sack;
4676                                 int abort_now = 0;
4677                                 uint32_t a_rwnd, cum_ack;
4678                                 uint16_t num_seg, num_nr_seg;
4679                                 int nonce_sum_flag;
4680
4681                                 if ((stcb == NULL) || (chk_length < sizeof(struct sctp_nr_sack_chunk))) {
4682                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on nr_sack chunk, too small\n");
4683                         ignore_nr_sack:
4684                                         *offset = length;
4685                                         if (locked_tcb) {
4686                                                 SCTP_TCB_UNLOCK(locked_tcb);
4687                                         }
4688                                         return (NULL);
4689                                 }
4690                                 /*
4691                                  * EY nr_sacks have not been negotiated but
4692                                  * the peer end sent an nr_sack, silently
4693                                  * discard the chunk
4694                                  */
4695                                 if (!(SCTP_BASE_SYSCTL(sctp_nr_sack_on_off) && stcb->asoc.peer_supports_nr_sack)) {
4696                                         goto unknown_chunk;
4697                                 }
4698                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
4699                                         /*-
4700                                          * If we have sent a shutdown-ack, we will pay no
4701                                          * attention to a sack sent in to us since
4702                                          * we don't care anymore.
4703                                          */
4704                                         goto ignore_nr_sack;
4705                                 }
4706                                 nr_sack = (struct sctp_nr_sack_chunk *)ch;
4707                                 nonce_sum_flag = ch->chunk_flags & SCTP_SACK_NONCE_SUM;
4708
4709                                 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack);
4710                                 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks);
4711                                 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks);
4712                                 a_rwnd = (uint32_t) ntohl(nr_sack->nr_sack.a_rwnd);
4713                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n",
4714                                     cum_ack,
4715                                     num_seg,
4716                                     a_rwnd
4717                                     );
4718                                 stcb->asoc.seen_a_sack_this_pkt = 1;
4719                                 if ((stcb->asoc.pr_sctp_cnt == 0) &&
4720                                     (num_seg == 0) &&
4721                                     ((compare_with_wrap(cum_ack, stcb->asoc.last_acked_seq, MAX_TSN)) ||
4722                                     (cum_ack == stcb->asoc.last_acked_seq)) &&
4723                                     (stcb->asoc.saw_sack_with_frags == 0) &&
4724                                     (!TAILQ_EMPTY(&stcb->asoc.sent_queue))
4725                                     ) {
4726                                         /*
4727                                          * We have a SIMPLE sack having no
4728                                          * prior segments and data on sent
4729                                          * queue to be acked.. Use the
4730                                          * faster path sack processing. We
4731                                          * also allow window update sacks
4732                                          * with no missing segments to go
4733                                          * this way too.
4734                                          */
4735                                         sctp_express_handle_nr_sack(stcb, cum_ack, a_rwnd, nonce_sum_flag,
4736                                             &abort_now);
4737                                 } else {
4738                                         if (netp && *netp)
4739                                                 sctp_handle_nr_sack(m, *offset,
4740                                                     nr_sack, stcb, *netp, &abort_now, chk_length, a_rwnd);
4741                                 }
4742                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
4743                                     TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
4744                                     (stcb->asoc.stream_queue_cnt == 0)) {
4745                                         sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
4746                                 }
4747                                 if (abort_now) {
4748                                         /* ABORT signal from sack processing */
4749                                         *offset = length;
4750                                         return (NULL);
4751                                 }
4752                         }
4753                         break;
4754
4755                 case SCTP_HEARTBEAT_REQUEST:
4756                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n");
4757                         if ((stcb) && netp && *netp) {
4758                                 SCTP_STAT_INCR(sctps_recvheartbeat);
4759                                 sctp_send_heartbeat_ack(stcb, m, *offset,
4760                                     chk_length, *netp);
4761
4762                                 /* He's alive so give him credit */
4763                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
4764                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
4765                                             stcb->asoc.overall_error_count,
4766                                             0,
4767                                             SCTP_FROM_SCTP_INPUT,
4768                                             __LINE__);
4769                                 }
4770                                 stcb->asoc.overall_error_count = 0;
4771                         }
4772                         break;
4773                 case SCTP_HEARTBEAT_ACK:
4774                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT-ACK\n");
4775                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) {
4776                                 /* Its not ours */
4777                                 *offset = length;
4778                                 if (locked_tcb) {
4779                                         SCTP_TCB_UNLOCK(locked_tcb);
4780                                 }
4781                                 return (NULL);
4782                         }
4783                         /* He's alive so give him credit */
4784                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
4785                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
4786                                     stcb->asoc.overall_error_count,
4787                                     0,
4788                                     SCTP_FROM_SCTP_INPUT,
4789                                     __LINE__);
4790                         }
4791                         stcb->asoc.overall_error_count = 0;
4792                         SCTP_STAT_INCR(sctps_recvheartbeatack);
4793                         if (netp && *netp)
4794                                 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch,
4795                                     stcb, *netp);
4796                         break;
4797                 case SCTP_ABORT_ASSOCIATION:
4798                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n",
4799                             stcb);
4800                         if ((stcb) && netp && *netp)
4801                                 sctp_handle_abort((struct sctp_abort_chunk *)ch,
4802                                     stcb, *netp);
4803                         *offset = length;
4804                         return (NULL);
4805                         break;
4806                 case SCTP_SHUTDOWN:
4807                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n",
4808                             stcb);
4809                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) {
4810                                 *offset = length;
4811                                 if (locked_tcb) {
4812                                         SCTP_TCB_UNLOCK(locked_tcb);
4813                                 }
4814                                 return (NULL);
4815                         }
4816                         if (netp && *netp) {
4817                                 int abort_flag = 0;
4818
4819                                 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch,
4820                                     stcb, *netp, &abort_flag);
4821                                 if (abort_flag) {
4822                                         *offset = length;
4823                                         return (NULL);
4824                                 }
4825                         }
4826                         break;
4827                 case SCTP_SHUTDOWN_ACK:
4828                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-ACK, stcb %p\n", stcb);
4829                         if ((stcb) && (netp) && (*netp))
4830                                 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp);
4831                         *offset = length;
4832                         return (NULL);
4833                         break;
4834
4835                 case SCTP_OPERATION_ERROR:
4836                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP-ERR\n");
4837                         if ((stcb) && netp && *netp && sctp_handle_error(ch, stcb, *netp) < 0) {
4838
4839                                 *offset = length;
4840                                 return (NULL);
4841                         }
4842                         break;
4843                 case SCTP_COOKIE_ECHO:
4844                         SCTPDBG(SCTP_DEBUG_INPUT3,
4845                             "SCTP_COOKIE-ECHO, stcb %p\n", stcb);
4846                         if ((stcb) && (stcb->asoc.total_output_queue_size)) {
4847                                 ;
4848                         } else {
4849                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4850                                         /* We are not interested anymore */
4851                                         *offset = length;
4852                                         return (NULL);
4853                                 }
4854                         }
4855                         /*
4856                          * First are we accepting? We do this again here
4857                          * sincen it is possible that a previous endpoint
4858                          * WAS listening responded to a INIT-ACK and then
4859                          * closed. We opened and bound.. and are now no
4860                          * longer listening.
4861                          */
4862
4863                         if ((stcb == NULL) && (inp->sctp_socket->so_qlen >= inp->sctp_socket->so_qlimit)) {
4864                                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
4865                                     (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) {
4866                                         struct mbuf *oper;
4867                                         struct sctp_paramhdr *phdr;
4868
4869                                         oper = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
4870                                             0, M_DONTWAIT, 1, MT_DATA);
4871                                         if (oper) {
4872                                                 SCTP_BUF_LEN(oper) =
4873                                                     sizeof(struct sctp_paramhdr);
4874                                                 phdr = mtod(oper,
4875                                                     struct sctp_paramhdr *);
4876                                                 phdr->param_type =
4877                                                     htons(SCTP_CAUSE_OUT_OF_RESC);
4878                                                 phdr->param_length =
4879                                                     htons(sizeof(struct sctp_paramhdr));
4880                                         }
4881                                         sctp_abort_association(inp, stcb, m,
4882                                             iphlen, sh, oper, vrf_id, port);
4883                                 }
4884                                 *offset = length;
4885                                 return (NULL);
4886                         } else {
4887                                 struct mbuf *ret_buf;
4888                                 struct sctp_inpcb *linp;
4889
4890                                 if (stcb) {
4891                                         linp = NULL;
4892                                 } else {
4893                                         linp = inp;
4894                                 }
4895
4896                                 if (linp) {
4897                                         SCTP_ASOC_CREATE_LOCK(linp);
4898                                 }
4899                                 if (netp) {
4900                                         ret_buf =
4901                                             sctp_handle_cookie_echo(m, iphlen,
4902                                             *offset, sh,
4903                                             (struct sctp_cookie_echo_chunk *)ch,
4904                                             &inp, &stcb, netp,
4905                                             auth_skipped,
4906                                             auth_offset,
4907                                             auth_len,
4908                                             &locked_tcb,
4909                                             vrf_id,
4910                                             port);
4911                                 } else {
4912                                         ret_buf = NULL;
4913                                 }
4914                                 if (linp) {
4915                                         SCTP_ASOC_CREATE_UNLOCK(linp);
4916                                 }
4917                                 if (ret_buf == NULL) {
4918                                         if (locked_tcb) {
4919                                                 SCTP_TCB_UNLOCK(locked_tcb);
4920                                         }
4921                                         SCTPDBG(SCTP_DEBUG_INPUT3,
4922                                             "GAK, null buffer\n");
4923                                         auth_skipped = 0;
4924                                         *offset = length;
4925                                         return (NULL);
4926                                 }
4927                                 /* if AUTH skipped, see if it verified... */
4928                                 if (auth_skipped) {
4929                                         got_auth = 1;
4930                                         auth_skipped = 0;
4931                                 }
4932                                 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) {
4933                                         /*
4934                                          * Restart the timer if we have
4935                                          * pending data
4936                                          */
4937                                         struct sctp_tmit_chunk *chk;
4938
4939                                         chk = TAILQ_FIRST(&stcb->asoc.sent_queue);
4940                                         if (chk) {
4941                                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND,
4942                                                     stcb->sctp_ep, stcb,
4943                                                     chk->whoTo);
4944                                         }
4945                                 }
4946                         }
4947                         break;
4948                 case SCTP_COOKIE_ACK:
4949                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE-ACK, stcb %p\n", stcb);
4950                         if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) {
4951                                 if (locked_tcb) {
4952                                         SCTP_TCB_UNLOCK(locked_tcb);
4953                                 }
4954                                 return (NULL);
4955                         }
4956                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4957                                 /* We are not interested anymore */
4958                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
4959                                         ;
4960                                 } else if (stcb) {
4961 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4962                                         so = SCTP_INP_SO(inp);
4963                                         atomic_add_int(&stcb->asoc.refcnt, 1);
4964                                         SCTP_TCB_UNLOCK(stcb);
4965                                         SCTP_SOCKET_LOCK(so, 1);
4966                                         SCTP_TCB_LOCK(stcb);
4967                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
4968 #endif
4969                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27);
4970 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4971                                         SCTP_SOCKET_UNLOCK(so, 1);
4972 #endif
4973                                         *offset = length;
4974                                         return (NULL);
4975                                 }
4976                         }
4977                         /* He's alive so give him credit */
4978                         if ((stcb) && netp && *netp) {
4979                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
4980                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
4981                                             stcb->asoc.overall_error_count,
4982                                             0,
4983                                             SCTP_FROM_SCTP_INPUT,
4984                                             __LINE__);
4985                                 }
4986                                 stcb->asoc.overall_error_count = 0;
4987                                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp);
4988                         }
4989                         break;
4990                 case SCTP_ECN_ECHO:
4991                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-ECHO\n");
4992                         /* He's alive so give him credit */
4993                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) {
4994                                 /* Its not ours */
4995                                 if (locked_tcb) {
4996                                         SCTP_TCB_UNLOCK(locked_tcb);
4997                                 }
4998                                 *offset = length;
4999                                 return (NULL);
5000                         }
5001                         if (stcb) {
5002                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5003                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5004                                             stcb->asoc.overall_error_count,
5005                                             0,
5006                                             SCTP_FROM_SCTP_INPUT,
5007                                             __LINE__);
5008                                 }
5009                                 stcb->asoc.overall_error_count = 0;
5010                                 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch,
5011                                     stcb);
5012                         }
5013                         break;
5014                 case SCTP_ECN_CWR:
5015                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-CWR\n");
5016                         /* He's alive so give him credit */
5017                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) {
5018                                 /* Its not ours */
5019                                 if (locked_tcb) {
5020                                         SCTP_TCB_UNLOCK(locked_tcb);
5021                                 }
5022                                 *offset = length;
5023                                 return (NULL);
5024                         }
5025                         if (stcb) {
5026                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5027                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5028                                             stcb->asoc.overall_error_count,
5029                                             0,
5030                                             SCTP_FROM_SCTP_INPUT,
5031                                             __LINE__);
5032                                 }
5033                                 stcb->asoc.overall_error_count = 0;
5034                                 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb);
5035                         }
5036                         break;
5037                 case SCTP_SHUTDOWN_COMPLETE:
5038                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-COMPLETE, stcb %p\n", stcb);
5039                         /* must be first and only chunk */
5040                         if ((num_chunks > 1) ||
5041                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
5042                                 *offset = length;
5043                                 if (locked_tcb) {
5044                                         SCTP_TCB_UNLOCK(locked_tcb);
5045                                 }
5046                                 return (NULL);
5047                         }
5048                         if ((stcb) && netp && *netp) {
5049                                 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch,
5050                                     stcb, *netp);
5051                         }
5052                         *offset = length;
5053                         return (NULL);
5054                         break;
5055                 case SCTP_ASCONF:
5056                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n");
5057                         /* He's alive so give him credit */
5058                         if (stcb) {
5059                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5060                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5061                                             stcb->asoc.overall_error_count,
5062                                             0,
5063                                             SCTP_FROM_SCTP_INPUT,
5064                                             __LINE__);
5065                                 }
5066                                 stcb->asoc.overall_error_count = 0;
5067                                 sctp_handle_asconf(m, *offset,
5068                                     (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0);
5069                                 asconf_cnt++;
5070                         }
5071                         break;
5072                 case SCTP_ASCONF_ACK:
5073                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF-ACK\n");
5074                         if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) {
5075                                 /* Its not ours */
5076                                 if (locked_tcb) {
5077                                         SCTP_TCB_UNLOCK(locked_tcb);
5078                                 }
5079                                 *offset = length;
5080                                 return (NULL);
5081                         }
5082                         if ((stcb) && netp && *netp) {
5083                                 /* He's alive so give him credit */
5084                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5085                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5086                                             stcb->asoc.overall_error_count,
5087                                             0,
5088                                             SCTP_FROM_SCTP_INPUT,
5089                                             __LINE__);
5090                                 }
5091                                 stcb->asoc.overall_error_count = 0;
5092                                 sctp_handle_asconf_ack(m, *offset,
5093                                     (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock);
5094                                 if (abort_no_unlock)
5095                                         return (NULL);
5096                         }
5097                         break;
5098                 case SCTP_FORWARD_CUM_TSN:
5099                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD-TSN\n");
5100                         if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) {
5101                                 /* Its not ours */
5102                                 if (locked_tcb) {
5103                                         SCTP_TCB_UNLOCK(locked_tcb);
5104                                 }
5105                                 *offset = length;
5106                                 return (NULL);
5107                         }
5108                         /* He's alive so give him credit */
5109                         if (stcb) {
5110                                 int abort_flag = 0;
5111
5112                                 stcb->asoc.overall_error_count = 0;
5113                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5114                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5115                                             stcb->asoc.overall_error_count,
5116                                             0,
5117                                             SCTP_FROM_SCTP_INPUT,
5118                                             __LINE__);
5119                                 }
5120                                 *fwd_tsn_seen = 1;
5121                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5122                                         /* We are not interested anymore */
5123 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5124                                         so = SCTP_INP_SO(inp);
5125                                         atomic_add_int(&stcb->asoc.refcnt, 1);
5126                                         SCTP_TCB_UNLOCK(stcb);
5127                                         SCTP_SOCKET_LOCK(so, 1);
5128                                         SCTP_TCB_LOCK(stcb);
5129                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
5130 #endif
5131                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_29);
5132 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5133                                         SCTP_SOCKET_UNLOCK(so, 1);
5134 #endif
5135                                         *offset = length;
5136                                         return (NULL);
5137                                 }
5138                                 sctp_handle_forward_tsn(stcb,
5139                                     (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset);
5140                                 if (abort_flag) {
5141                                         *offset = length;
5142                                         return (NULL);
5143                                 } else {
5144                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5145                                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5146                                                     stcb->asoc.overall_error_count,
5147                                                     0,
5148                                                     SCTP_FROM_SCTP_INPUT,
5149                                                     __LINE__);
5150                                         }
5151                                         stcb->asoc.overall_error_count = 0;
5152                                 }
5153
5154                         }
5155                         break;
5156                 case SCTP_STREAM_RESET:
5157                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n");
5158                         if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) {
5159                                 /* Its not ours */
5160                                 if (locked_tcb) {
5161                                         SCTP_TCB_UNLOCK(locked_tcb);
5162                                 }
5163                                 *offset = length;
5164                                 return (NULL);
5165                         }
5166                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5167                                 /* We are not interested anymore */
5168 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5169                                 so = SCTP_INP_SO(inp);
5170                                 atomic_add_int(&stcb->asoc.refcnt, 1);
5171                                 SCTP_TCB_UNLOCK(stcb);
5172                                 SCTP_SOCKET_LOCK(so, 1);
5173                                 SCTP_TCB_LOCK(stcb);
5174                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
5175 #endif
5176                                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_30);
5177 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5178                                 SCTP_SOCKET_UNLOCK(so, 1);
5179 #endif
5180                                 *offset = length;
5181                                 return (NULL);
5182                         }
5183                         if (stcb->asoc.peer_supports_strreset == 0) {
5184                                 /*
5185                                  * hmm, peer should have announced this, but
5186                                  * we will turn it on since he is sending us
5187                                  * a stream reset.
5188                                  */
5189                                 stcb->asoc.peer_supports_strreset = 1;
5190                         }
5191                         if (sctp_handle_stream_reset(stcb, m, *offset, (struct sctp_stream_reset_out_req *)ch)) {
5192                                 /* stop processing */
5193                                 *offset = length;
5194                                 return (NULL);
5195                         }
5196                         break;
5197                 case SCTP_PACKET_DROPPED:
5198                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n");
5199                         /* re-get it all please */
5200                         if (chk_length < sizeof(struct sctp_pktdrop_chunk)) {
5201                                 /* Its not ours */
5202                                 if (locked_tcb) {
5203                                         SCTP_TCB_UNLOCK(locked_tcb);
5204                                 }
5205                                 *offset = length;
5206                                 return (NULL);
5207                         }
5208                         if (ch && (stcb) && netp && (*netp)) {
5209                                 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch,
5210                                     stcb, *netp,
5211                                     min(chk_length, (sizeof(chunk_buf) - 4)));
5212
5213                         }
5214                         break;
5215
5216                 case SCTP_AUTHENTICATION:
5217                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n");
5218                         if (SCTP_BASE_SYSCTL(sctp_auth_disable))
5219                                 goto unknown_chunk;
5220
5221                         if (stcb == NULL) {
5222                                 /* save the first AUTH for later processing */
5223                                 if (auth_skipped == 0) {
5224                                         auth_offset = *offset;
5225                                         auth_len = chk_length;
5226                                         auth_skipped = 1;
5227                                 }
5228                                 /* skip this chunk (temporarily) */
5229                                 goto next_chunk;
5230                         }
5231                         if ((chk_length < (sizeof(struct sctp_auth_chunk))) ||
5232                             (chk_length > (sizeof(struct sctp_auth_chunk) +
5233                             SCTP_AUTH_DIGEST_LEN_MAX))) {
5234                                 /* Its not ours */
5235                                 if (locked_tcb) {
5236                                         SCTP_TCB_UNLOCK(locked_tcb);
5237                                 }
5238                                 *offset = length;
5239                                 return (NULL);
5240                         }
5241                         if (got_auth == 1) {
5242                                 /* skip this chunk... it's already auth'd */
5243                                 goto next_chunk;
5244                         }
5245                         got_auth = 1;
5246                         if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch,
5247                             m, *offset)) {
5248                                 /* auth HMAC failed so dump the packet */
5249                                 *offset = length;
5250                                 return (stcb);
5251                         } else {
5252                                 /* remaining chunks are HMAC checked */
5253                                 stcb->asoc.authenticated = 1;
5254                         }
5255                         break;
5256
5257                 default:
5258         unknown_chunk:
5259                         /* it's an unknown chunk! */
5260                         if ((ch->chunk_type & 0x40) && (stcb != NULL)) {
5261                                 struct mbuf *mm;
5262                                 struct sctp_paramhdr *phd;
5263
5264                                 mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
5265                                     0, M_DONTWAIT, 1, MT_DATA);
5266                                 if (mm) {
5267                                         phd = mtod(mm, struct sctp_paramhdr *);
5268                                         /*
5269                                          * We cheat and use param type since
5270                                          * we did not bother to define a
5271                                          * error cause struct. They are the
5272                                          * same basic format with different
5273                                          * names.
5274                                          */
5275                                         phd->param_type = htons(SCTP_CAUSE_UNRECOG_CHUNK);
5276                                         phd->param_length = htons(chk_length + sizeof(*phd));
5277                                         SCTP_BUF_LEN(mm) = sizeof(*phd);
5278                                         SCTP_BUF_NEXT(mm) = SCTP_M_COPYM(m, *offset, SCTP_SIZE32(chk_length),
5279                                             M_DONTWAIT);
5280                                         if (SCTP_BUF_NEXT(mm)) {
5281 #ifdef SCTP_MBUF_LOGGING
5282                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5283                                                         struct mbuf *mat;
5284
5285                                                         mat = SCTP_BUF_NEXT(mm);
5286                                                         while (mat) {
5287                                                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
5288                                                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
5289                                                                 }
5290                                                                 mat = SCTP_BUF_NEXT(mat);
5291                                                         }
5292                                                 }
5293 #endif
5294                                                 sctp_queue_op_err(stcb, mm);
5295                                         } else {
5296                                                 sctp_m_freem(mm);
5297                                         }
5298                                 }
5299                         }
5300                         if ((ch->chunk_type & 0x80) == 0) {
5301                                 /* discard this packet */
5302                                 *offset = length;
5303                                 return (stcb);
5304                         }       /* else skip this bad chunk and continue... */
5305                         break;
5306                 }               /* switch (ch->chunk_type) */
5307
5308
5309 next_chunk:
5310                 /* get the next chunk */
5311                 *offset += SCTP_SIZE32(chk_length);
5312                 if (*offset >= length) {
5313                         /* no more data left in the mbuf chain */
5314                         break;
5315                 }
5316                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
5317                     sizeof(struct sctp_chunkhdr), chunk_buf);
5318                 if (ch == NULL) {
5319                         if (locked_tcb) {
5320                                 SCTP_TCB_UNLOCK(locked_tcb);
5321                         }
5322                         *offset = length;
5323                         return (NULL);
5324                 }
5325         }                       /* while */
5326
5327         if (asconf_cnt > 0 && stcb != NULL) {
5328                 sctp_send_asconf_ack(stcb);
5329         }
5330         return (stcb);
5331 }
5332
5333
5334 /*
5335  * Process the ECN bits we have something set so we must look to see if it is
5336  * ECN(0) or ECN(1) or CE
5337  */
5338 static void
5339 sctp_process_ecn_marked_a(struct sctp_tcb *stcb, struct sctp_nets *net,
5340     uint8_t ecn_bits)
5341 {
5342         if ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS) {
5343                 ;
5344         } else if ((ecn_bits & SCTP_ECT1_BIT) == SCTP_ECT1_BIT) {
5345                 /*
5346                  * we only add to the nonce sum for ECT1, ECT0 does not
5347                  * change the NS bit (that we have yet to find a way to send
5348                  * it yet).
5349                  */
5350
5351                 /* ECN Nonce stuff */
5352                 stcb->asoc.receiver_nonce_sum++;
5353                 stcb->asoc.receiver_nonce_sum &= SCTP_SACK_NONCE_SUM;
5354
5355                 /*
5356                  * Drag up the last_echo point if cumack is larger since we
5357                  * don't want the point falling way behind by more than
5358                  * 2^^31 and then having it be incorrect.
5359                  */
5360                 if (compare_with_wrap(stcb->asoc.cumulative_tsn,
5361                     stcb->asoc.last_echo_tsn, MAX_TSN)) {
5362                         stcb->asoc.last_echo_tsn = stcb->asoc.cumulative_tsn;
5363                 }
5364         } else if ((ecn_bits & SCTP_ECT0_BIT) == SCTP_ECT0_BIT) {
5365                 /*
5366                  * Drag up the last_echo point if cumack is larger since we
5367                  * don't want the point falling way behind by more than
5368                  * 2^^31 and then having it be incorrect.
5369                  */
5370                 if (compare_with_wrap(stcb->asoc.cumulative_tsn,
5371                     stcb->asoc.last_echo_tsn, MAX_TSN)) {
5372                         stcb->asoc.last_echo_tsn = stcb->asoc.cumulative_tsn;
5373                 }
5374         }
5375 }
5376
5377 static void
5378 sctp_process_ecn_marked_b(struct sctp_tcb *stcb, struct sctp_nets *net,
5379     uint32_t high_tsn, uint8_t ecn_bits)
5380 {
5381         if ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS) {
5382                 /*
5383                  * we possibly must notify the sender that a congestion
5384                  * window reduction is in order. We do this by adding a ECNE
5385                  * chunk to the output chunk queue. The incoming CWR will
5386                  * remove this chunk.
5387                  */
5388                 if (compare_with_wrap(high_tsn, stcb->asoc.last_echo_tsn,
5389                     MAX_TSN)) {
5390                         /* Yep, we need to add a ECNE */
5391                         sctp_send_ecn_echo(stcb, net, high_tsn);
5392                         stcb->asoc.last_echo_tsn = high_tsn;
5393                 }
5394         }
5395 }
5396
5397 #ifdef INVARIANTS
5398 static void
5399 sctp_validate_no_locks(struct sctp_inpcb *inp)
5400 {
5401         struct sctp_tcb *stcb;
5402
5403         LIST_FOREACH(stcb, &inp->sctp_asoc_list, sctp_tcblist) {
5404                 if (mtx_owned(&stcb->tcb_mtx)) {
5405                         panic("Own lock on stcb at return from input");
5406                 }
5407         }
5408 }
5409
5410 #endif
5411
5412 /*
5413  * common input chunk processing (v4 and v6)
5414  */
5415 void
5416 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset,
5417     int length, struct sctphdr *sh, struct sctp_chunkhdr *ch,
5418     struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets *net,
5419     uint8_t ecn_bits, uint32_t vrf_id, uint16_t port)
5420 {
5421         /*
5422          * Control chunk processing
5423          */
5424         uint32_t high_tsn;
5425         int fwd_tsn_seen = 0, data_processed = 0;
5426         struct mbuf *m = *mm;
5427         int abort_flag = 0;
5428         int un_sent;
5429
5430         SCTP_STAT_INCR(sctps_recvdatagrams);
5431 #ifdef SCTP_AUDITING_ENABLED
5432         sctp_audit_log(0xE0, 1);
5433         sctp_auditing(0, inp, stcb, net);
5434 #endif
5435
5436         SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n",
5437             m, iphlen, offset, length, stcb);
5438         if (stcb) {
5439                 /* always clear this before beginning a packet */
5440                 stcb->asoc.authenticated = 0;
5441                 stcb->asoc.seen_a_sack_this_pkt = 0;
5442                 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n",
5443                     stcb, stcb->asoc.state);
5444
5445                 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) ||
5446                     (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) {
5447                         /*-
5448                          * If we hit here, we had a ref count
5449                          * up when the assoc was aborted and the
5450                          * timer is clearing out the assoc, we should
5451                          * NOT respond to any packet.. its OOTB.
5452                          */
5453                         SCTP_TCB_UNLOCK(stcb);
5454                         sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL,
5455                             vrf_id, port);
5456                         goto out_now;
5457                 }
5458         }
5459         if (IS_SCTP_CONTROL(ch)) {
5460                 /* process the control portion of the SCTP packet */
5461                 /* sa_ignore NO_NULL_CHK */
5462                 stcb = sctp_process_control(m, iphlen, &offset, length, sh, ch,
5463                     inp, stcb, &net, &fwd_tsn_seen, vrf_id, port);
5464                 if (stcb) {
5465                         /*
5466                          * This covers us if the cookie-echo was there and
5467                          * it changes our INP.
5468                          */
5469                         inp = stcb->sctp_ep;
5470                         if ((net) && (port)) {
5471                                 if (net->port == 0) {
5472                                         sctp_pathmtu_adjustment(inp, stcb, net, net->mtu - sizeof(struct udphdr));
5473                                 }
5474                                 net->port = port;
5475                         }
5476                 }
5477         } else {
5478                 /*
5479                  * no control chunks, so pre-process DATA chunks (these
5480                  * checks are taken care of by control processing)
5481                  */
5482
5483                 /*
5484                  * if DATA only packet, and auth is required, then punt...
5485                  * can't have authenticated without any AUTH (control)
5486                  * chunks
5487                  */
5488                 if ((stcb != NULL) &&
5489                     !SCTP_BASE_SYSCTL(sctp_auth_disable) &&
5490                     sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) {
5491                         /* "silently" ignore */
5492                         SCTP_STAT_INCR(sctps_recvauthmissing);
5493                         SCTP_TCB_UNLOCK(stcb);
5494                         goto out_now;
5495                 }
5496                 if (stcb == NULL) {
5497                         /* out of the blue DATA chunk */
5498                         sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL,
5499                             vrf_id, port);
5500                         goto out_now;
5501                 }
5502                 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) {
5503                         /* v_tag mismatch! */
5504                         SCTP_STAT_INCR(sctps_badvtag);
5505                         SCTP_TCB_UNLOCK(stcb);
5506                         goto out_now;
5507                 }
5508         }
5509
5510         if (stcb == NULL) {
5511                 /*
5512                  * no valid TCB for this packet, or we found it's a bad
5513                  * packet while processing control, or we're done with this
5514                  * packet (done or skip rest of data), so we drop it...
5515                  */
5516                 goto out_now;
5517         }
5518         /*
5519          * DATA chunk processing
5520          */
5521         /* plow through the data chunks while length > offset */
5522
5523         /*
5524          * Rest should be DATA only.  Check authentication state if AUTH for
5525          * DATA is required.
5526          */
5527         if ((length > offset) &&
5528             (stcb != NULL) &&
5529             !SCTP_BASE_SYSCTL(sctp_auth_disable) &&
5530             sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) &&
5531             !stcb->asoc.authenticated) {
5532                 /* "silently" ignore */
5533                 SCTP_STAT_INCR(sctps_recvauthmissing);
5534                 SCTPDBG(SCTP_DEBUG_AUTH1,
5535                     "Data chunk requires AUTH, skipped\n");
5536                 goto trigger_send;
5537         }
5538         if (length > offset) {
5539                 int retval;
5540
5541                 /*
5542                  * First check to make sure our state is correct. We would
5543                  * not get here unless we really did have a tag, so we don't
5544                  * abort if this happens, just dump the chunk silently.
5545                  */
5546                 switch (SCTP_GET_STATE(&stcb->asoc)) {
5547                 case SCTP_STATE_COOKIE_ECHOED:
5548                         /*
5549                          * we consider data with valid tags in this state
5550                          * shows us the cookie-ack was lost. Imply it was
5551                          * there.
5552                          */
5553                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5554                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5555                                     stcb->asoc.overall_error_count,
5556                                     0,
5557                                     SCTP_FROM_SCTP_INPUT,
5558                                     __LINE__);
5559                         }
5560                         stcb->asoc.overall_error_count = 0;
5561                         sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net);
5562                         break;
5563                 case SCTP_STATE_COOKIE_WAIT:
5564                         /*
5565                          * We consider OOTB any data sent during asoc setup.
5566                          */
5567                         sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL,
5568                             vrf_id, port);
5569                         SCTP_TCB_UNLOCK(stcb);
5570                         goto out_now;
5571                         /* sa_ignore NOTREACHED */
5572                         break;
5573                 case SCTP_STATE_EMPTY:  /* should not happen */
5574                 case SCTP_STATE_INUSE:  /* should not happen */
5575                 case SCTP_STATE_SHUTDOWN_RECEIVED:      /* This is a peer error */
5576                 case SCTP_STATE_SHUTDOWN_ACK_SENT:
5577                 default:
5578                         SCTP_TCB_UNLOCK(stcb);
5579                         goto out_now;
5580                         /* sa_ignore NOTREACHED */
5581                         break;
5582                 case SCTP_STATE_OPEN:
5583                 case SCTP_STATE_SHUTDOWN_SENT:
5584                         break;
5585                 }
5586                 /* take care of ECN, part 1. */
5587                 if (stcb->asoc.ecn_allowed &&
5588                     (ecn_bits & (SCTP_ECT0_BIT | SCTP_ECT1_BIT))) {
5589                         sctp_process_ecn_marked_a(stcb, net, ecn_bits);
5590                 }
5591                 /* plow through the data chunks while length > offset */
5592                 retval = sctp_process_data(mm, iphlen, &offset, length, sh,
5593                     inp, stcb, net, &high_tsn);
5594                 if (retval == 2) {
5595                         /*
5596                          * The association aborted, NO UNLOCK needed since
5597                          * the association is destroyed.
5598                          */
5599                         goto out_now;
5600                 }
5601                 data_processed = 1;
5602                 if (retval == 0) {
5603                         /* take care of ecn part 2. */
5604                         if (stcb->asoc.ecn_allowed &&
5605                             (ecn_bits & (SCTP_ECT0_BIT | SCTP_ECT1_BIT))) {
5606                                 sctp_process_ecn_marked_b(stcb, net, high_tsn,
5607                                     ecn_bits);
5608                         }
5609                 }
5610                 /*
5611                  * Anything important needs to have been m_copy'ed in
5612                  * process_data
5613                  */
5614         }
5615         if ((data_processed == 0) && (fwd_tsn_seen)) {
5616                 int was_a_gap = 0;
5617
5618                 if (compare_with_wrap(stcb->asoc.highest_tsn_inside_map,
5619                     stcb->asoc.cumulative_tsn, MAX_TSN)) {
5620                         /* there was a gap before this data was processed */
5621                         was_a_gap = 1;
5622                 }
5623                 stcb->asoc.send_sack = 1;
5624                 sctp_sack_check(stcb, 1, was_a_gap, &abort_flag);
5625                 if (abort_flag) {
5626                         /* Again, we aborted so NO UNLOCK needed */
5627                         goto out_now;
5628                 }
5629         } else if (fwd_tsn_seen) {
5630                 stcb->asoc.send_sack = 1;
5631         }
5632         /* trigger send of any chunks in queue... */
5633 trigger_send:
5634 #ifdef SCTP_AUDITING_ENABLED
5635         sctp_audit_log(0xE0, 2);
5636         sctp_auditing(1, inp, stcb, net);
5637 #endif
5638         SCTPDBG(SCTP_DEBUG_INPUT1,
5639             "Check for chunk output prw:%d tqe:%d tf=%d\n",
5640             stcb->asoc.peers_rwnd,
5641             TAILQ_EMPTY(&stcb->asoc.control_send_queue),
5642             stcb->asoc.total_flight);
5643         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
5644
5645         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue) ||
5646             ((un_sent) &&
5647             (stcb->asoc.peers_rwnd > 0 ||
5648             (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) {
5649                 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n");
5650                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
5651                 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n");
5652         }
5653 #ifdef SCTP_AUDITING_ENABLED
5654         sctp_audit_log(0xE0, 3);
5655         sctp_auditing(2, inp, stcb, net);
5656 #endif
5657         SCTP_TCB_UNLOCK(stcb);
5658 out_now:
5659 #ifdef INVARIANTS
5660         sctp_validate_no_locks(inp);
5661 #endif
5662         return;
5663 }
5664
5665 #if 0
5666 static void
5667 sctp_print_mbuf_chain(struct mbuf *m)
5668 {
5669         for (; m; m = SCTP_BUF_NEXT(m)) {
5670                 printf("%p: m_len = %ld\n", m, SCTP_BUF_LEN(m));
5671                 if (SCTP_BUF_IS_EXTENDED(m))
5672                         printf("%p: extend_size = %d\n", m, SCTP_BUF_EXTEND_SIZE(m));
5673         }
5674 }
5675
5676 #endif
5677
5678 void
5679 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port)
5680 {
5681 #ifdef SCTP_MBUF_LOGGING
5682         struct mbuf *mat;
5683
5684 #endif
5685         struct mbuf *m;
5686         int iphlen;
5687         uint32_t vrf_id = 0;
5688         uint8_t ecn_bits;
5689         struct ip *ip;
5690         struct sctphdr *sh;
5691         struct sctp_inpcb *inp = NULL;
5692
5693         uint32_t check, calc_check;
5694         struct sctp_nets *net;
5695         struct sctp_tcb *stcb = NULL;
5696         struct sctp_chunkhdr *ch;
5697         int refcount_up = 0;
5698         int length, mlen, offset;
5699
5700         if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) {
5701                 SCTP_RELEASE_PKT(i_pak);
5702                 return;
5703         }
5704         mlen = SCTP_HEADER_LEN(i_pak);
5705         iphlen = off;
5706         m = SCTP_HEADER_TO_CHAIN(i_pak);
5707
5708         net = NULL;
5709         SCTP_STAT_INCR(sctps_recvpackets);
5710         SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
5711
5712
5713 #ifdef SCTP_MBUF_LOGGING
5714         /* Log in any input mbufs */
5715         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5716                 mat = m;
5717                 while (mat) {
5718                         if (SCTP_BUF_IS_EXTENDED(mat)) {
5719                                 sctp_log_mb(mat, SCTP_MBUF_INPUT);
5720                         }
5721                         mat = SCTP_BUF_NEXT(mat);
5722                 }
5723         }
5724 #endif
5725 #ifdef  SCTP_PACKET_LOGGING
5726         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
5727                 sctp_packet_log(m, mlen);
5728 #endif
5729         /*
5730          * Must take out the iphlen, since mlen expects this (only effect lb
5731          * case)
5732          */
5733         mlen -= iphlen;
5734
5735         /*
5736          * Get IP, SCTP, and first chunk header together in first mbuf.
5737          */
5738         ip = mtod(m, struct ip *);
5739         offset = iphlen + sizeof(*sh) + sizeof(*ch);
5740         if (SCTP_BUF_LEN(m) < offset) {
5741                 if ((m = m_pullup(m, offset)) == 0) {
5742                         SCTP_STAT_INCR(sctps_hdrops);
5743                         return;
5744                 }
5745                 ip = mtod(m, struct ip *);
5746         }
5747         /* validate mbuf chain length with IP payload length */
5748         if (mlen < (SCTP_GET_IPV4_LENGTH(ip) - iphlen)) {
5749                 SCTP_STAT_INCR(sctps_hdrops);
5750                 goto bad;
5751         }
5752         sh = (struct sctphdr *)((caddr_t)ip + iphlen);
5753         ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(*sh));
5754         SCTPDBG(SCTP_DEBUG_INPUT1,
5755             "sctp_input() length:%d iphlen:%d\n", mlen, iphlen);
5756
5757         /* SCTP does not allow broadcasts or multicasts */
5758         if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
5759                 goto bad;
5760         }
5761         if (SCTP_IS_IT_BROADCAST(ip->ip_dst, m)) {
5762                 /*
5763                  * We only look at broadcast if its a front state, All
5764                  * others we will not have a tcb for anyway.
5765                  */
5766                 goto bad;
5767         }
5768         /* validate SCTP checksum */
5769         SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
5770             "sctp_input(): Packet of length %d received on %s with csum_flags 0x%x.\n",
5771             m->m_pkthdr.len,
5772             if_name(m->m_pkthdr.rcvif),
5773             m->m_pkthdr.csum_flags);
5774         if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
5775                 SCTP_STAT_INCR(sctps_recvhwcrc);
5776                 goto sctp_skip_csum_4;
5777         }
5778         check = sh->checksum;   /* save incoming checksum */
5779         if ((check == 0) && (SCTP_BASE_SYSCTL(sctp_no_csum_on_loopback)) &&
5780             ((ip->ip_src.s_addr == ip->ip_dst.s_addr) ||
5781             (SCTP_IS_IT_LOOPBACK(m)))
5782             ) {
5783                 SCTP_STAT_INCR(sctps_recvnocrc);
5784                 goto sctp_skip_csum_4;
5785         }
5786         sh->checksum = 0;       /* prepare for calc */
5787         calc_check = sctp_calculate_cksum(m, iphlen);
5788         SCTP_STAT_INCR(sctps_recvswcrc);
5789         if (calc_check != check) {
5790                 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x  m:%p mlen:%d iphlen:%d\n",
5791                     calc_check, check, m, mlen, iphlen);
5792
5793                 stcb = sctp_findassociation_addr(m, iphlen,
5794                     offset - sizeof(*ch),
5795                     sh, ch, &inp, &net,
5796                     vrf_id);
5797                 if ((net) && (port)) {
5798                         if (net->port == 0) {
5799                                 sctp_pathmtu_adjustment(inp, stcb, net, net->mtu - sizeof(struct udphdr));
5800                         }
5801                         net->port = port;
5802                 }
5803                 if ((inp) && (stcb)) {
5804                         sctp_send_packet_dropped(stcb, net, m, iphlen, 1);
5805                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED);
5806                 } else if ((inp != NULL) && (stcb == NULL)) {
5807                         refcount_up = 1;
5808                 }
5809                 SCTP_STAT_INCR(sctps_badsum);
5810                 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors);
5811                 goto bad;
5812         }
5813         sh->checksum = calc_check;
5814 sctp_skip_csum_4:
5815         /* destination port of 0 is illegal, based on RFC2960. */
5816         if (sh->dest_port == 0) {
5817                 SCTP_STAT_INCR(sctps_hdrops);
5818                 goto bad;
5819         }
5820         /*
5821          * Locate pcb and tcb for datagram sctp_findassociation_addr() wants
5822          * IP/SCTP/first chunk header...
5823          */
5824         stcb = sctp_findassociation_addr(m, iphlen, offset - sizeof(*ch),
5825             sh, ch, &inp, &net, vrf_id);
5826         if ((net) && (port)) {
5827                 if (net->port == 0) {
5828                         sctp_pathmtu_adjustment(inp, stcb, net, net->mtu - sizeof(struct udphdr));
5829                 }
5830                 net->port = port;
5831         }
5832         /* inp's ref-count increased && stcb locked */
5833         if (inp == NULL) {
5834                 struct sctp_init_chunk *init_chk, chunk_buf;
5835
5836                 SCTP_STAT_INCR(sctps_noport);
5837 #ifdef ICMP_BANDLIM
5838                 /*
5839                  * we use the bandwidth limiting to protect against sending
5840                  * too many ABORTS all at once. In this case these count the
5841                  * same as an ICMP message.
5842                  */
5843                 if (badport_bandlim(0) < 0)
5844                         goto bad;
5845 #endif                          /* ICMP_BANDLIM */
5846                 SCTPDBG(SCTP_DEBUG_INPUT1,
5847                     "Sending a ABORT from packet entry!\n");
5848                 if (ch->chunk_type == SCTP_INITIATION) {
5849                         /*
5850                          * we do a trick here to get the INIT tag, dig in
5851                          * and get the tag from the INIT and put it in the
5852                          * common header.
5853                          */
5854                         init_chk = (struct sctp_init_chunk *)sctp_m_getptr(m,
5855                             iphlen + sizeof(*sh), sizeof(*init_chk),
5856                             (uint8_t *) & chunk_buf);
5857                         if (init_chk != NULL)
5858                                 sh->v_tag = init_chk->init.initiate_tag;
5859                 }
5860                 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
5861                         sctp_send_shutdown_complete2(m, iphlen, sh, vrf_id, port);
5862                         goto bad;
5863                 }
5864                 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) {
5865                         goto bad;
5866                 }
5867                 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION)
5868                         sctp_send_abort(m, iphlen, sh, 0, NULL, vrf_id, port);
5869                 goto bad;
5870         } else if (stcb == NULL) {
5871                 refcount_up = 1;
5872         }
5873 #ifdef IPSEC
5874         /*
5875          * I very much doubt any of the IPSEC stuff will work but I have no
5876          * idea, so I will leave it in place.
5877          */
5878         if (inp && ipsec4_in_reject(m, &inp->ip_inp.inp)) {
5879                 MODULE_GLOBAL(MOD_IPSEC, ipsec4stat).in_polvio++;
5880                 SCTP_STAT_INCR(sctps_hdrops);
5881                 goto bad;
5882         }
5883 #endif                          /* IPSEC */
5884
5885         /*
5886          * common chunk processing
5887          */
5888         length = ip->ip_len + iphlen;
5889         offset -= sizeof(struct sctp_chunkhdr);
5890
5891         ecn_bits = ip->ip_tos;
5892
5893         /* sa_ignore NO_NULL_CHK */
5894         sctp_common_input_processing(&m, iphlen, offset, length, sh, ch,
5895             inp, stcb, net, ecn_bits, vrf_id, port);
5896         /* inp's ref-count reduced && stcb unlocked */
5897         if (m) {
5898                 sctp_m_freem(m);
5899         }
5900         if ((inp) && (refcount_up)) {
5901                 /* reduce ref-count */
5902                 SCTP_INP_DECR_REF(inp);
5903         }
5904         return;
5905 bad:
5906         if (stcb) {
5907                 SCTP_TCB_UNLOCK(stcb);
5908         }
5909         if ((inp) && (refcount_up)) {
5910                 /* reduce ref-count */
5911                 SCTP_INP_DECR_REF(inp);
5912         }
5913         if (m) {
5914                 sctp_m_freem(m);
5915         }
5916         return;
5917 }
5918 void
5919 sctp_input(i_pak, off)
5920         struct mbuf *i_pak;
5921         int off;
5922 {
5923         sctp_input_with_port(i_pak, off, 0);
5924 }