sys/netinet/sctp_input.c

   1 /*-
   2  * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved.
   3  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
   4  * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions are met:
   8  *
   9  * a) Redistributions of source code must retain the above copyright notice,
  10  *    this list of conditions and the following disclaimer.
  11  *
  12  * b) Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in
  14  *    the documentation and/or other materials provided with the distribution.
  15  *
  16  * c) Neither the name of Cisco Systems, Inc. nor the names of its
  17  *    contributors may be used to endorse or promote products derived
  18  *    from this software without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  21  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  22  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  24  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  30  * THE POSSIBILITY OF SUCH DAMAGE.
  31  */
  32
  33 #include <sys/cdefs.h>
  34 __FBSDID("$FreeBSD$");
  35
  36 #include <netinet/sctp_os.h>
  37 #include <netinet/sctp_var.h>
  38 #include <netinet/sctp_sysctl.h>
  39 #include <netinet/sctp_pcb.h>
  40 #include <netinet/sctp_header.h>
  41 #include <netinet/sctputil.h>
  42 #include <netinet/sctp_output.h>
  43 #include <netinet/sctp_input.h>
  44 #include <netinet/sctp_auth.h>
  45 #include <netinet/sctp_indata.h>
  46 #include <netinet/sctp_asconf.h>
  47 #include <netinet/sctp_bsd_addr.h>
  48 #include <netinet/sctp_timer.h>
  49 #include <netinet/sctp_crc32.h>
  50 #include <netinet/udp.h>
  51 #include <sys/smp.h>
  52
  53
  54
  55 static void
  56 sctp_stop_all_cookie_timers(struct sctp_tcb *stcb)
  57 {
  58         struct sctp_nets *net;
  59
  60         /*
  61          * This now not only stops all cookie timers it also stops any INIT
  62          * timers as well. This will make sure that the timers are stopped
  63          * in all collision cases.
  64          */
  65         SCTP_TCB_LOCK_ASSERT(stcb);
  66         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
  67                 if (net->rxt_timer.type == SCTP_TIMER_TYPE_COOKIE) {
  68                         sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE,
  69                             stcb->sctp_ep,
  70                             stcb,
  71                             net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_1);
  72                 } else if (net->rxt_timer.type == SCTP_TIMER_TYPE_INIT) {
  73                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT,
  74                             stcb->sctp_ep,
  75                             stcb,
  76                             net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_2);
  77                 }
  78         }
  79 }
  80
  81 /* INIT handler */
  82 static void
  83 sctp_handle_init(struct mbuf *m, int iphlen, int offset,
  84     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
  85     struct sctp_init_chunk *cp, struct sctp_inpcb *inp,
  86     struct sctp_tcb *stcb, int *abort_no_unlock,
  87     uint8_t use_mflowid, uint32_t mflowid,
  88     uint32_t vrf_id, uint16_t port)
  89 {
  90         struct sctp_init *init;
  91         struct mbuf *op_err;
  92
  93         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_init: handling INIT tcb:%p\n",
  94             (void *)stcb);
  95         if (stcb == NULL) {
  96                 SCTP_INP_RLOCK(inp);
  97         }
  98         /* validate length */
  99         if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_chunk)) {
 100                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
 101                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 102                     use_mflowid, mflowid,
 103                     vrf_id, port);
 104                 if (stcb)
 105                         *abort_no_unlock = 1;
 106                 goto outnow;
 107         }
 108         /* validate parameters */
 109         init = &cp->init;
 110         if (init->initiate_tag == 0) {
 111                 /* protocol error... send abort */
 112                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
 113                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 114                     use_mflowid, mflowid,
 115                     vrf_id, port);
 116                 if (stcb)
 117                         *abort_no_unlock = 1;
 118                 goto outnow;
 119         }
 120         if (ntohl(init->a_rwnd) < SCTP_MIN_RWND) {
 121                 /* invalid parameter... send abort */
 122                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
 123                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 124                     use_mflowid, mflowid,
 125                     vrf_id, port);
 126                 if (stcb)
 127                         *abort_no_unlock = 1;
 128                 goto outnow;
 129         }
 130         if (init->num_inbound_streams == 0) {
 131                 /* protocol error... send abort */
 132                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
 133                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 134                     use_mflowid, mflowid,
 135                     vrf_id, port);
 136                 if (stcb)
 137                         *abort_no_unlock = 1;
 138                 goto outnow;
 139         }
 140         if (init->num_outbound_streams == 0) {
 141                 /* protocol error... send abort */
 142                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
 143                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 144                     use_mflowid, mflowid,
 145                     vrf_id, port);
 146                 if (stcb)
 147                         *abort_no_unlock = 1;
 148                 goto outnow;
 149         }
 150         if (sctp_validate_init_auth_params(m, offset + sizeof(*cp),
 151             offset + ntohs(cp->ch.chunk_length))) {
 152                 /* auth parameter(s) error... send abort */
 153                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, NULL,
 154                     use_mflowid, mflowid,
 155                     vrf_id, port);
 156                 if (stcb)
 157                         *abort_no_unlock = 1;
 158                 goto outnow;
 159         }
 160         /*
 161          * We are only accepting if we have a socket with positive
 162          * so_qlimit.
 163          */
 164         if ((stcb == NULL) &&
 165             ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
 166             (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) ||
 167             (inp->sctp_socket == NULL) ||
 168             (inp->sctp_socket->so_qlimit == 0))) {
 169                 /*
 170                  * FIX ME ?? What about TCP model and we have a
 171                  * match/restart case? Actually no fix is needed. the lookup
 172                  * will always find the existing assoc so stcb would not be
 173                  * NULL. It may be questionable to do this since we COULD
 174                  * just send back the INIT-ACK and hope that the app did
 175                  * accept()'s by the time the COOKIE was sent. But there is
 176                  * a price to pay for COOKIE generation and I don't want to
 177                  * pay it on the chance that the app will actually do some
 178                  * accepts(). The App just looses and should NOT be in this
 179                  * state :-)
 180                  */
 181                 if (SCTP_BASE_SYSCTL(sctp_blackhole) == 0) {
 182                         sctp_send_abort(m, iphlen, src, dst, sh, 0, NULL,
 183                             use_mflowid, mflowid,
 184                             vrf_id, port);
 185                 }
 186                 goto outnow;
 187         }
 188         if ((stcb != NULL) &&
 189             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT)) {
 190                 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending SHUTDOWN-ACK\n");
 191                 sctp_send_shutdown_ack(stcb, NULL);
 192                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
 193         } else {
 194                 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n");
 195                 sctp_send_initiate_ack(inp, stcb, m, iphlen, offset, src, dst,
 196                     sh, cp,
 197                     use_mflowid, mflowid,
 198                     vrf_id, port,
 199                     ((stcb == NULL) ? SCTP_HOLDS_LOCK : SCTP_NOT_LOCKED));
 200         }
 201 outnow:
 202         if (stcb == NULL) {
 203                 SCTP_INP_RUNLOCK(inp);
 204         }
 205 }
 206
 207 /*
 208  * process peer "INIT/INIT-ACK" chunk returns value < 0 on error
 209  */
 210
 211 int
 212 sctp_is_there_unsent_data(struct sctp_tcb *stcb, int so_locked
 213 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
 214     SCTP_UNUSED
 215 #endif
 216 )
 217 {
 218         int unsent_data = 0;
 219         unsigned int i;
 220         struct sctp_stream_queue_pending *sp;
 221         struct sctp_association *asoc;
 222
 223         /*
 224          * This function returns the number of streams that have true unsent
 225          * data on them. Note that as it looks through it will clean up any
 226          * places that have old data that has been sent but left at top of
 227          * stream queue.
 228          */
 229         asoc = &stcb->asoc;
 230         SCTP_TCB_SEND_LOCK(stcb);
 231         if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
 232                 /* Check to see if some data queued */
 233                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
 234                         /* sa_ignore FREED_MEMORY */
 235                         sp = TAILQ_FIRST(&stcb->asoc.strmout[i].outqueue);
 236                         if (sp == NULL) {
 237                                 continue;
 238                         }
 239                         if ((sp->msg_is_complete) &&
 240                             (sp->length == 0) &&
 241                             (sp->sender_all_done)) {
 242                                 /*
 243                                  * We are doing differed cleanup. Last time
 244                                  * through when we took all the data the
 245                                  * sender_all_done was not set.
 246                                  */
 247                                 if (sp->put_last_out == 0) {
 248                                         SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
 249                                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n",
 250                                             sp->sender_all_done,
 251                                             sp->length,
 252                                             sp->msg_is_complete,
 253                                             sp->put_last_out);
 254                                 }
 255                                 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1);
 256                                 TAILQ_REMOVE(&stcb->asoc.strmout[i].outqueue, sp, next);
 257                                 if (sp->net) {
 258                                         sctp_free_remote_addr(sp->net);
 259                                         sp->net = NULL;
 260                                 }
 261                                 if (sp->data) {
 262                                         sctp_m_freem(sp->data);
 263                                         sp->data = NULL;
 264                                 }
 265                                 sctp_free_a_strmoq(stcb, sp, so_locked);
 266                         } else {
 267                                 unsent_data++;
 268                                 break;
 269                         }
 270                 }
 271         }
 272         SCTP_TCB_SEND_UNLOCK(stcb);
 273         return (unsent_data);
 274 }
 275
 276 static int
 277 sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb)
 278 {
 279         struct sctp_init *init;
 280         struct sctp_association *asoc;
 281         struct sctp_nets *lnet;
 282         unsigned int i;
 283
 284         init = &cp->init;
 285         asoc = &stcb->asoc;
 286         /* save off parameters */
 287         asoc->peer_vtag = ntohl(init->initiate_tag);
 288         asoc->peers_rwnd = ntohl(init->a_rwnd);
 289         /* init tsn's */
 290         asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1;
 291
 292         if (!TAILQ_EMPTY(&asoc->nets)) {
 293                 /* update any ssthresh's that may have a default */
 294                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
 295                         lnet->ssthresh = asoc->peers_rwnd;
 296                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) {
 297                                 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION);
 298                         }
 299                 }
 300         }
 301         SCTP_TCB_SEND_LOCK(stcb);
 302         if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) {
 303                 unsigned int newcnt;
 304                 struct sctp_stream_out *outs;
 305                 struct sctp_stream_queue_pending *sp, *nsp;
 306                 struct sctp_tmit_chunk *chk, *nchk;
 307
 308                 /* abandon the upper streams */
 309                 newcnt = ntohs(init->num_inbound_streams);
 310                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
 311                         if (chk->rec.data.stream_number >= newcnt) {
 312                                 TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next);
 313                                 asoc->send_queue_cnt--;
 314                                 if (asoc->strmout[chk->rec.data.stream_number].chunks_on_queues > 0) {
 315                                         asoc->strmout[chk->rec.data.stream_number].chunks_on_queues--;
 316 #ifdef INVARIANTS
 317                                 } else {
 318                                         panic("No chunks on the queues for sid %u.", chk->rec.data.stream_number);
 319 #endif
 320                                 }
 321                                 if (chk->data != NULL) {
 322                                         sctp_free_bufspace(stcb, asoc, chk, 1);
 323                                         sctp_ulp_notify(SCTP_NOTIFY_UNSENT_DG_FAIL, stcb,
 324                                             0, chk, SCTP_SO_NOT_LOCKED);
 325                                         if (chk->data) {
 326                                                 sctp_m_freem(chk->data);
 327                                                 chk->data = NULL;
 328                                         }
 329                                 }
 330                                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
 331                                 /* sa_ignore FREED_MEMORY */
 332                         }
 333                 }
 334                 if (asoc->strmout) {
 335                         for (i = newcnt; i < asoc->pre_open_streams; i++) {
 336                                 outs = &asoc->strmout[i];
 337                                 TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) {
 338                                         TAILQ_REMOVE(&outs->outqueue, sp, next);
 339                                         asoc->stream_queue_cnt--;
 340                                         sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL,
 341                                             stcb, 0, sp, SCTP_SO_NOT_LOCKED);
 342                                         if (sp->data) {
 343                                                 sctp_m_freem(sp->data);
 344                                                 sp->data = NULL;
 345                                         }
 346                                         if (sp->net) {
 347                                                 sctp_free_remote_addr(sp->net);
 348                                                 sp->net = NULL;
 349                                         }
 350                                         /* Free the chunk */
 351                                         sctp_free_a_strmoq(stcb, sp, SCTP_SO_NOT_LOCKED);
 352                                         /* sa_ignore FREED_MEMORY */
 353                                 }
 354                         }
 355                 }
 356                 /* cut back the count */
 357                 asoc->pre_open_streams = newcnt;
 358         }
 359         SCTP_TCB_SEND_UNLOCK(stcb);
 360         asoc->strm_realoutsize = asoc->streamoutcnt = asoc->pre_open_streams;
 361
 362         /* EY - nr_sack: initialize highest tsn in nr_mapping_array */
 363         asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
 364         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
 365                 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
 366         }
 367         /* This is the next one we expect */
 368         asoc->str_reset_seq_in = asoc->asconf_seq_in + 1;
 369
 370         asoc->mapping_array_base_tsn = ntohl(init->initial_tsn);
 371         asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in;
 372
 373         asoc->advanced_peer_ack_point = asoc->last_acked_seq;
 374         /* open the requested streams */
 375
 376         if (asoc->strmin != NULL) {
 377                 /* Free the old ones */
 378                 struct sctp_queued_to_read *ctl, *nctl;
 379
 380                 for (i = 0; i < asoc->streamincnt; i++) {
 381                         TAILQ_FOREACH_SAFE(ctl, &asoc->strmin[i].inqueue, next, nctl) {
 382                                 TAILQ_REMOVE(&asoc->strmin[i].inqueue, ctl, next);
 383                                 sctp_free_remote_addr(ctl->whoFrom);
 384                                 ctl->whoFrom = NULL;
 385                                 sctp_m_freem(ctl->data);
 386                                 ctl->data = NULL;
 387                                 sctp_free_a_readq(stcb, ctl);
 388                         }
 389                 }
 390                 SCTP_FREE(asoc->strmin, SCTP_M_STRMI);
 391         }
 392         asoc->streamincnt = ntohs(init->num_outbound_streams);
 393         if (asoc->streamincnt > MAX_SCTP_STREAMS) {
 394                 asoc->streamincnt = MAX_SCTP_STREAMS;
 395         }
 396         SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt *
 397             sizeof(struct sctp_stream_in), SCTP_M_STRMI);
 398         if (asoc->strmin == NULL) {
 399                 /* we didn't get memory for the streams! */
 400                 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n");
 401                 return (-1);
 402         }
 403         for (i = 0; i < asoc->streamincnt; i++) {
 404                 asoc->strmin[i].stream_no = i;
 405                 asoc->strmin[i].last_sequence_delivered = 0xffff;
 406                 /*
 407                  * U-stream ranges will be set when the cookie is unpacked.
 408                  * Or for the INIT sender they are un set (if pr-sctp not
 409                  * supported) when the INIT-ACK arrives.
 410                  */
 411                 TAILQ_INIT(&asoc->strmin[i].inqueue);
 412                 asoc->strmin[i].delivery_started = 0;
 413         }
 414         /*
 415          * load_address_from_init will put the addresses into the
 416          * association when the COOKIE is processed or the INIT-ACK is
 417          * processed. Both types of COOKIE's existing and new call this
 418          * routine. It will remove addresses that are no longer in the
 419          * association (for the restarting case where addresses are
 420          * removed). Up front when the INIT arrives we will discard it if it
 421          * is a restart and new addresses have been added.
 422          */
 423         /* sa_ignore MEMLEAK */
 424         return (0);
 425 }
 426
 427 /*
 428  * INIT-ACK message processing/consumption returns value < 0 on error
 429  */
 430 static int
 431 sctp_process_init_ack(struct mbuf *m, int iphlen, int offset,
 432     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
 433     struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
 434     struct sctp_nets *net, int *abort_no_unlock,
 435     uint8_t use_mflowid, uint32_t mflowid,
 436     uint32_t vrf_id)
 437 {
 438         struct sctp_association *asoc;
 439         struct mbuf *op_err;
 440         int retval, abort_flag;
 441         uint32_t initack_limit;
 442         int nat_friendly = 0;
 443
 444         /* First verify that we have no illegal param's */
 445         abort_flag = 0;
 446         op_err = NULL;
 447
 448         op_err = sctp_arethere_unrecognized_parameters(m,
 449             (offset + sizeof(struct sctp_init_chunk)),
 450             &abort_flag, (struct sctp_chunkhdr *)cp, &nat_friendly);
 451         if (abort_flag) {
 452                 /* Send an abort and notify peer */
 453                 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
 454                 *abort_no_unlock = 1;
 455                 return (-1);
 456         }
 457         asoc = &stcb->asoc;
 458         asoc->peer_supports_nat = (uint8_t) nat_friendly;
 459         /* process the peer's parameters in the INIT-ACK */
 460         retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb);
 461         if (retval < 0) {
 462                 return (retval);
 463         }
 464         initack_limit = offset + ntohs(cp->ch.chunk_length);
 465         /* load all addresses */
 466         if ((retval = sctp_load_addresses_from_init(stcb, m,
 467             (offset + sizeof(struct sctp_init_chunk)), initack_limit,
 468             src, dst, NULL))) {
 469                 /* Huh, we should abort */
 470                 SCTPDBG(SCTP_DEBUG_INPUT1,
 471                     "Load addresses from INIT causes an abort %d\n",
 472                     retval);
 473                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
 474                     src, dst, sh, NULL,
 475                     use_mflowid, mflowid,
 476                     vrf_id, net->port);
 477                 *abort_no_unlock = 1;
 478                 return (-1);
 479         }
 480         /* if the peer doesn't support asconf, flush the asconf queue */
 481         if (asoc->peer_supports_asconf == 0) {
 482                 struct sctp_asconf_addr *param, *nparam;
 483
 484                 TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) {
 485                         TAILQ_REMOVE(&asoc->asconf_queue, param, next);
 486                         SCTP_FREE(param, SCTP_M_ASC_ADDR);
 487                 }
 488         }
 489         stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs,
 490             stcb->asoc.local_hmacs);
 491         if (op_err) {
 492                 sctp_queue_op_err(stcb, op_err);
 493                 /* queuing will steal away the mbuf chain to the out queue */
 494                 op_err = NULL;
 495         }
 496         /* extract the cookie and queue it to "echo" it back... */
 497         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 498                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
 499                     stcb->asoc.overall_error_count,
 500                     0,
 501                     SCTP_FROM_SCTP_INPUT,
 502                     __LINE__);
 503         }
 504         stcb->asoc.overall_error_count = 0;
 505         net->error_count = 0;
 506
 507         /*
 508          * Cancel the INIT timer, We do this first before queueing the
 509          * cookie. We always cancel at the primary to assue that we are
 510          * canceling the timer started by the INIT which always goes to the
 511          * primary.
 512          */
 513         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb,
 514             asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4);
 515
 516         /* calculate the RTO */
 517         net->RTO = sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, sctp_align_safe_nocopy,
 518             SCTP_RTT_FROM_NON_DATA);
 519
 520         retval = sctp_send_cookie_echo(m, offset, stcb, net);
 521         if (retval < 0) {
 522                 /*
 523                  * No cookie, we probably should send a op error. But in any
 524                  * case if there is no cookie in the INIT-ACK, we can
 525                  * abandon the peer, its broke.
 526                  */
 527                 if (retval == -3) {
 528                         /* We abort with an error of missing mandatory param */
 529                         op_err =
 530                             sctp_generate_invmanparam(SCTP_CAUSE_MISSING_PARAM);
 531                         if (op_err) {
 532                                 /*
 533                                  * Expand beyond to include the mandatory
 534                                  * param cookie
 535                                  */
 536                                 struct sctp_inv_mandatory_param *mp;
 537
 538                                 SCTP_BUF_LEN(op_err) =
 539                                     sizeof(struct sctp_inv_mandatory_param);
 540                                 mp = mtod(op_err,
 541                                     struct sctp_inv_mandatory_param *);
 542                                 /* Subtract the reserved param */
 543                                 mp->length =
 544                                     htons(sizeof(struct sctp_inv_mandatory_param) - 2);
 545                                 mp->num_param = htonl(1);
 546                                 mp->param = htons(SCTP_STATE_COOKIE);
 547                                 mp->resv = 0;
 548                         }
 549                         sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
 550                             src, dst, sh, op_err,
 551                             use_mflowid, mflowid,
 552                             vrf_id, net->port);
 553                         *abort_no_unlock = 1;
 554                 }
 555                 return (retval);
 556         }
 557         return (0);
 558 }
 559
 560 static void
 561 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp,
 562     struct sctp_tcb *stcb, struct sctp_nets *net)
 563 {
 564         struct sockaddr_storage store;
 565         struct sctp_nets *r_net, *f_net;
 566         struct timeval tv;
 567         int req_prim = 0;
 568         uint16_t old_error_counter;
 569
 570 #ifdef INET
 571         struct sockaddr_in *sin;
 572
 573 #endif
 574 #ifdef INET6
 575         struct sockaddr_in6 *sin6;
 576
 577 #endif
 578
 579         if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) {
 580                 /* Invalid length */
 581                 return;
 582         }
 583         memset(&store, 0, sizeof(store));
 584         switch (cp->heartbeat.hb_info.addr_family) {
 585 #ifdef INET
 586         case AF_INET:
 587                 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) {
 588                         sin = (struct sockaddr_in *)&store;
 589                         sin->sin_family = cp->heartbeat.hb_info.addr_family;
 590                         sin->sin_len = cp->heartbeat.hb_info.addr_len;
 591                         sin->sin_port = stcb->rport;
 592                         memcpy(&sin->sin_addr, cp->heartbeat.hb_info.address,
 593                             sizeof(sin->sin_addr));
 594                 } else {
 595                         return;
 596                 }
 597                 break;
 598 #endif
 599 #ifdef INET6
 600         case AF_INET6:
 601                 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) {
 602                         sin6 = (struct sockaddr_in6 *)&store;
 603                         sin6->sin6_family = cp->heartbeat.hb_info.addr_family;
 604                         sin6->sin6_len = cp->heartbeat.hb_info.addr_len;
 605                         sin6->sin6_port = stcb->rport;
 606                         memcpy(&sin6->sin6_addr, cp->heartbeat.hb_info.address,
 607                             sizeof(sin6->sin6_addr));
 608                 } else {
 609                         return;
 610                 }
 611                 break;
 612 #endif
 613         default:
 614                 return;
 615         }
 616         r_net = sctp_findnet(stcb, (struct sockaddr *)&store);
 617         if (r_net == NULL) {
 618                 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n");
 619                 return;
 620         }
 621         if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) &&
 622             (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) &&
 623             (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) {
 624                 /*
 625                  * If the its a HB and it's random value is correct when can
 626                  * confirm the destination.
 627                  */
 628                 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
 629                 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) {
 630                         stcb->asoc.primary_destination = r_net;
 631                         r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY;
 632                         f_net = TAILQ_FIRST(&stcb->asoc.nets);
 633                         if (f_net != r_net) {
 634                                 /*
 635                                  * first one on the list is NOT the primary
 636                                  * sctp_cmpaddr() is much more efficent if
 637                                  * the primary is the first on the list,
 638                                  * make it so.
 639                                  */
 640                                 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next);
 641                                 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next);
 642                         }
 643                         req_prim = 1;
 644                 }
 645                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
 646                     stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED);
 647                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3);
 648                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
 649         }
 650         old_error_counter = r_net->error_count;
 651         r_net->error_count = 0;
 652         r_net->hb_responded = 1;
 653         tv.tv_sec = cp->heartbeat.hb_info.time_value_1;
 654         tv.tv_usec = cp->heartbeat.hb_info.time_value_2;
 655         /* Now lets do a RTO with this */
 656         r_net->RTO = sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, sctp_align_safe_nocopy,
 657             SCTP_RTT_FROM_NON_DATA);
 658         if (!(r_net->dest_state & SCTP_ADDR_REACHABLE)) {
 659                 r_net->dest_state |= SCTP_ADDR_REACHABLE;
 660                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb,
 661                     0, (void *)r_net, SCTP_SO_NOT_LOCKED);
 662         }
 663         if (r_net->dest_state & SCTP_ADDR_PF) {
 664                 r_net->dest_state &= ~SCTP_ADDR_PF;
 665                 stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net);
 666         }
 667         if (old_error_counter > 0) {
 668                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3);
 669                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
 670         }
 671         if (r_net == stcb->asoc.primary_destination) {
 672                 if (stcb->asoc.alternate) {
 673                         /* release the alternate, primary is good */
 674                         sctp_free_remote_addr(stcb->asoc.alternate);
 675                         stcb->asoc.alternate = NULL;
 676                 }
 677         }
 678         /* Mobility adaptation */
 679         if (req_prim) {
 680                 if ((sctp_is_mobility_feature_on(stcb->sctp_ep,
 681                     SCTP_MOBILITY_BASE) ||
 682                     sctp_is_mobility_feature_on(stcb->sctp_ep,
 683                     SCTP_MOBILITY_FASTHANDOFF)) &&
 684                     sctp_is_mobility_feature_on(stcb->sctp_ep,
 685                     SCTP_MOBILITY_PRIM_DELETED)) {
 686
 687                         sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED, stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_TIMER + SCTP_LOC_7);
 688                         if (sctp_is_mobility_feature_on(stcb->sctp_ep,
 689                             SCTP_MOBILITY_FASTHANDOFF)) {
 690                                 sctp_assoc_immediate_retrans(stcb,
 691                                     stcb->asoc.primary_destination);
 692                         }
 693                         if (sctp_is_mobility_feature_on(stcb->sctp_ep,
 694                             SCTP_MOBILITY_BASE)) {
 695                                 sctp_move_chunks_from_net(stcb,
 696                                     stcb->asoc.deleted_primary);
 697                         }
 698                         sctp_delete_prim_timer(stcb->sctp_ep, stcb,
 699                             stcb->asoc.deleted_primary);
 700                 }
 701         }
 702 }
 703
 704 static int
 705 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb)
 706 {
 707         /*
 708          * return 0 means we want you to proceed with the abort non-zero
 709          * means no abort processing
 710          */
 711         struct sctpasochead *head;
 712
 713         if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_WAIT) {
 714                 /* generate a new vtag and send init */
 715                 LIST_REMOVE(stcb, sctp_asocs);
 716                 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1);
 717                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
 718                 /*
 719                  * put it in the bucket in the vtag hash of assoc's for the
 720                  * system
 721                  */
 722                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
 723                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
 724                 return (1);
 725         }
 726         if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) {
 727                 /*
 728                  * treat like a case where the cookie expired i.e.: - dump
 729                  * current cookie. - generate a new vtag. - resend init.
 730                  */
 731                 /* generate a new vtag and send init */
 732                 LIST_REMOVE(stcb, sctp_asocs);
 733                 stcb->asoc.state &= ~SCTP_STATE_COOKIE_ECHOED;
 734                 stcb->asoc.state |= SCTP_STATE_COOKIE_WAIT;
 735                 sctp_stop_all_cookie_timers(stcb);
 736                 sctp_toss_old_cookies(stcb, &stcb->asoc);
 737                 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1);
 738                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
 739                 /*
 740                  * put it in the bucket in the vtag hash of assoc's for the
 741                  * system
 742                  */
 743                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
 744                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
 745                 return (1);
 746         }
 747         return (0);
 748 }
 749
 750 static int
 751 sctp_handle_nat_missing_state(struct sctp_tcb *stcb,
 752     struct sctp_nets *net)
 753 {
 754         /*
 755          * return 0 means we want you to proceed with the abort non-zero
 756          * means no abort processing
 757          */
 758         if (stcb->asoc.peer_supports_auth == 0) {
 759                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n");
 760                 return (0);
 761         }
 762         sctp_asconf_send_nat_state_update(stcb, net);
 763         return (1);
 764 }
 765
 766
 767 static void
 768 sctp_handle_abort(struct sctp_abort_chunk *abort,
 769     struct sctp_tcb *stcb, struct sctp_nets *net)
 770 {
 771 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 772         struct socket *so;
 773
 774 #endif
 775         uint16_t len;
 776         uint16_t error;
 777
 778         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n");
 779         if (stcb == NULL)
 780                 return;
 781
 782         len = ntohs(abort->ch.chunk_length);
 783         if (len > sizeof(struct sctp_chunkhdr)) {
 784                 /*
 785                  * Need to check the cause codes for our two magic nat
 786                  * aborts which don't kill the assoc necessarily.
 787                  */
 788                 struct sctp_missing_nat_state *natc;
 789
 790                 natc = (struct sctp_missing_nat_state *)(abort + 1);
 791                 error = ntohs(natc->cause);
 792                 if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) {
 793                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n",
 794                             abort->ch.chunk_flags);
 795                         if (sctp_handle_nat_colliding_state(stcb)) {
 796                                 return;
 797                         }
 798                 } else if (error == SCTP_CAUSE_NAT_MISSING_STATE) {
 799                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n",
 800                             abort->ch.chunk_flags);
 801                         if (sctp_handle_nat_missing_state(stcb, net)) {
 802                                 return;
 803                         }
 804                 }
 805         } else {
 806                 error = 0;
 807         }
 808         /* stop any receive timers */
 809         sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_6);
 810         /* notify user of the abort and clean up... */
 811         sctp_abort_notification(stcb, 1, error, abort, SCTP_SO_NOT_LOCKED);
 812         /* free the tcb */
 813         SCTP_STAT_INCR_COUNTER32(sctps_aborted);
 814         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) ||
 815             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
 816                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 817         }
 818 #ifdef SCTP_ASOCLOG_OF_TSNS
 819         sctp_print_out_track_log(stcb);
 820 #endif
 821 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 822         so = SCTP_INP_SO(stcb->sctp_ep);
 823         atomic_add_int(&stcb->asoc.refcnt, 1);
 824         SCTP_TCB_UNLOCK(stcb);
 825         SCTP_SOCKET_LOCK(so, 1);
 826         SCTP_TCB_LOCK(stcb);
 827         atomic_subtract_int(&stcb->asoc.refcnt, 1);
 828 #endif
 829         stcb->asoc.state |= SCTP_STATE_WAS_ABORTED;
 830         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
 831             SCTP_FROM_SCTP_INPUT + SCTP_LOC_6);
 832 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 833         SCTP_SOCKET_UNLOCK(so, 1);
 834 #endif
 835         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n");
 836 }
 837
 838 static void
 839 sctp_start_net_timers(struct sctp_tcb *stcb)
 840 {
 841         uint32_t cnt_hb_sent;
 842         struct sctp_nets *net;
 843
 844         cnt_hb_sent = 0;
 845         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
 846                 /*
 847                  * For each network start: 1) A pmtu timer. 2) A HB timer 3)
 848                  * If the dest in unconfirmed send a hb as well if under
 849                  * max_hb_burst have been sent.
 850                  */
 851                 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net);
 852                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net);
 853                 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) &&
 854                     (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) {
 855                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
 856                         cnt_hb_sent++;
 857                 }
 858         }
 859         if (cnt_hb_sent) {
 860                 sctp_chunk_output(stcb->sctp_ep, stcb,
 861                     SCTP_OUTPUT_FROM_COOKIE_ACK,
 862                     SCTP_SO_NOT_LOCKED);
 863         }
 864 }
 865
 866
 867 static void
 868 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp,
 869     struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag)
 870 {
 871         struct sctp_association *asoc;
 872         int some_on_streamwheel;
 873
 874 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 875         struct socket *so;
 876
 877 #endif
 878
 879         SCTPDBG(SCTP_DEBUG_INPUT2,
 880             "sctp_handle_shutdown: handling SHUTDOWN\n");
 881         if (stcb == NULL)
 882                 return;
 883         asoc = &stcb->asoc;
 884         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
 885             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
 886                 return;
 887         }
 888         if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) {
 889                 /* Shutdown NOT the expected size */
 890                 return;
 891         } else {
 892                 sctp_update_acked(stcb, cp, abort_flag);
 893                 if (*abort_flag) {
 894                         return;
 895                 }
 896         }
 897         if (asoc->control_pdapi) {
 898                 /*
 899                  * With a normal shutdown we assume the end of last record.
 900                  */
 901                 SCTP_INP_READ_LOCK(stcb->sctp_ep);
 902                 asoc->control_pdapi->end_added = 1;
 903                 asoc->control_pdapi->pdapi_aborted = 1;
 904                 asoc->control_pdapi = NULL;
 905                 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
 906 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 907                 so = SCTP_INP_SO(stcb->sctp_ep);
 908                 atomic_add_int(&stcb->asoc.refcnt, 1);
 909                 SCTP_TCB_UNLOCK(stcb);
 910                 SCTP_SOCKET_LOCK(so, 1);
 911                 SCTP_TCB_LOCK(stcb);
 912                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 913                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
 914                         /* assoc was freed while we were unlocked */
 915                         SCTP_SOCKET_UNLOCK(so, 1);
 916                         return;
 917                 }
 918 #endif
 919                 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
 920 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 921                 SCTP_SOCKET_UNLOCK(so, 1);
 922 #endif
 923         }
 924         /* goto SHUTDOWN_RECEIVED state to block new requests */
 925         if (stcb->sctp_socket) {
 926                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
 927                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) &&
 928                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) {
 929                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_RECEIVED);
 930                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
 931                         /*
 932                          * notify upper layer that peer has initiated a
 933                          * shutdown
 934                          */
 935                         sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
 936
 937                         /* reset time */
 938                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
 939                 }
 940         }
 941         if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) {
 942                 /*
 943                  * stop the shutdown timer, since we WILL move to
 944                  * SHUTDOWN-ACK-SENT.
 945                  */
 946                 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_8);
 947         }
 948         /* Now is there unsent data on a stream somewhere? */
 949         some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED);
 950
 951         if (!TAILQ_EMPTY(&asoc->send_queue) ||
 952             !TAILQ_EMPTY(&asoc->sent_queue) ||
 953             some_on_streamwheel) {
 954                 /* By returning we will push more data out */
 955                 return;
 956         } else {
 957                 /* no outstanding data to send, so move on... */
 958                 /* send SHUTDOWN-ACK */
 959                 /* move to SHUTDOWN-ACK-SENT state */
 960                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
 961                     (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
 962                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 963                 }
 964                 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT);
 965                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
 966                 sctp_stop_timers_for_shutdown(stcb);
 967                 sctp_send_shutdown_ack(stcb, net);
 968                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep,
 969                     stcb, net);
 970         }
 971 }
 972
 973 static void
 974 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED,
 975     struct sctp_tcb *stcb,
 976     struct sctp_nets *net)
 977 {
 978         struct sctp_association *asoc;
 979
 980 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 981         struct socket *so;
 982
 983         so = SCTP_INP_SO(stcb->sctp_ep);
 984 #endif
 985         SCTPDBG(SCTP_DEBUG_INPUT2,
 986             "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n");
 987         if (stcb == NULL)
 988                 return;
 989
 990         asoc = &stcb->asoc;
 991         /* process according to association state */
 992         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
 993             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
 994                 /* unexpected SHUTDOWN-ACK... do OOTB handling... */
 995                 sctp_send_shutdown_complete(stcb, net, 1);
 996                 SCTP_TCB_UNLOCK(stcb);
 997                 return;
 998         }
 999         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
1000             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
1001                 /* unexpected SHUTDOWN-ACK... so ignore... */
1002                 SCTP_TCB_UNLOCK(stcb);
1003                 return;
1004         }
1005         if (asoc->control_pdapi) {
1006                 /*
1007                  * With a normal shutdown we assume the end of last record.
1008                  */
1009                 SCTP_INP_READ_LOCK(stcb->sctp_ep);
1010                 asoc->control_pdapi->end_added = 1;
1011                 asoc->control_pdapi->pdapi_aborted = 1;
1012                 asoc->control_pdapi = NULL;
1013                 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
1014 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1015                 atomic_add_int(&stcb->asoc.refcnt, 1);
1016                 SCTP_TCB_UNLOCK(stcb);
1017                 SCTP_SOCKET_LOCK(so, 1);
1018                 SCTP_TCB_LOCK(stcb);
1019                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
1020                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1021                         /* assoc was freed while we were unlocked */
1022                         SCTP_SOCKET_UNLOCK(so, 1);
1023                         return;
1024                 }
1025 #endif
1026                 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
1027 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1028                 SCTP_SOCKET_UNLOCK(so, 1);
1029 #endif
1030         }
1031         /* are the queues empty? */
1032         if (!TAILQ_EMPTY(&asoc->send_queue) ||
1033             !TAILQ_EMPTY(&asoc->sent_queue) ||
1034             !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
1035                 sctp_report_all_outbound(stcb, 0, 0, SCTP_SO_NOT_LOCKED);
1036         }
1037         /* stop the timer */
1038         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9);
1039         /* send SHUTDOWN-COMPLETE */
1040         sctp_send_shutdown_complete(stcb, net, 0);
1041         /* notify upper layer protocol */
1042         if (stcb->sctp_socket) {
1043                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1044                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
1045                         stcb->sctp_socket->so_snd.sb_cc = 0;
1046                 }
1047                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
1048         }
1049         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
1050         /* free the TCB but first save off the ep */
1051 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1052         atomic_add_int(&stcb->asoc.refcnt, 1);
1053         SCTP_TCB_UNLOCK(stcb);
1054         SCTP_SOCKET_LOCK(so, 1);
1055         SCTP_TCB_LOCK(stcb);
1056         atomic_subtract_int(&stcb->asoc.refcnt, 1);
1057 #endif
1058         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1059             SCTP_FROM_SCTP_INPUT + SCTP_LOC_10);
1060 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1061         SCTP_SOCKET_UNLOCK(so, 1);
1062 #endif
1063 }
1064
1065 /*
1066  * Skip past the param header and then we will find the chunk that caused the
1067  * problem. There are two possiblities ASCONF or FWD-TSN other than that and
1068  * our peer must be broken.
1069  */
1070 static void
1071 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr,
1072     struct sctp_nets *net)
1073 {
1074         struct sctp_chunkhdr *chk;
1075
1076         chk = (struct sctp_chunkhdr *)((caddr_t)phdr + sizeof(*phdr));
1077         switch (chk->chunk_type) {
1078         case SCTP_ASCONF_ACK:
1079         case SCTP_ASCONF:
1080                 sctp_asconf_cleanup(stcb, net);
1081                 break;
1082         case SCTP_FORWARD_CUM_TSN:
1083                 stcb->asoc.peer_supports_prsctp = 0;
1084                 break;
1085         default:
1086                 SCTPDBG(SCTP_DEBUG_INPUT2,
1087                     "Peer does not support chunk type %d(%x)??\n",
1088                     chk->chunk_type, (uint32_t) chk->chunk_type);
1089                 break;
1090         }
1091 }
1092
1093 /*
1094  * Skip past the param header and then we will find the param that caused the
1095  * problem.  There are a number of param's in a ASCONF OR the prsctp param
1096  * these will turn of specific features.
1097  */
1098 static void
1099 sctp_process_unrecog_param(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr)
1100 {
1101         struct sctp_paramhdr *pbad;
1102
1103         pbad = phdr + 1;
1104         switch (ntohs(pbad->param_type)) {
1105                 /* pr-sctp draft */
1106         case SCTP_PRSCTP_SUPPORTED:
1107                 stcb->asoc.peer_supports_prsctp = 0;
1108                 break;
1109         case SCTP_SUPPORTED_CHUNK_EXT:
1110                 break;
1111                 /* draft-ietf-tsvwg-addip-sctp */
1112         case SCTP_HAS_NAT_SUPPORT:
1113                 stcb->asoc.peer_supports_nat = 0;
1114                 break;
1115         case SCTP_ADD_IP_ADDRESS:
1116         case SCTP_DEL_IP_ADDRESS:
1117         case SCTP_SET_PRIM_ADDR:
1118                 stcb->asoc.peer_supports_asconf = 0;
1119                 break;
1120         case SCTP_SUCCESS_REPORT:
1121         case SCTP_ERROR_CAUSE_IND:
1122                 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n");
1123                 SCTPDBG(SCTP_DEBUG_INPUT2,
1124                     "Turning off ASCONF to this strange peer\n");
1125                 stcb->asoc.peer_supports_asconf = 0;
1126                 break;
1127         default:
1128                 SCTPDBG(SCTP_DEBUG_INPUT2,
1129                     "Peer does not support param type %d(%x)??\n",
1130                     pbad->param_type, (uint32_t) pbad->param_type);
1131                 break;
1132         }
1133 }
1134
1135 static int
1136 sctp_handle_error(struct sctp_chunkhdr *ch,
1137     struct sctp_tcb *stcb, struct sctp_nets *net)
1138 {
1139         int chklen;
1140         struct sctp_paramhdr *phdr;
1141         uint16_t error, error_type;
1142         uint16_t error_len;
1143         struct sctp_association *asoc;
1144         int adjust;
1145
1146 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1147         struct socket *so;
1148
1149 #endif
1150
1151         /* parse through all of the errors and process */
1152         asoc = &stcb->asoc;
1153         phdr = (struct sctp_paramhdr *)((caddr_t)ch +
1154             sizeof(struct sctp_chunkhdr));
1155         chklen = ntohs(ch->chunk_length) - sizeof(struct sctp_chunkhdr);
1156         error = 0;
1157         while ((size_t)chklen >= sizeof(struct sctp_paramhdr)) {
1158                 /* Process an Error Cause */
1159                 error_type = ntohs(phdr->param_type);
1160                 error_len = ntohs(phdr->param_length);
1161                 if ((error_len > chklen) || (error_len == 0)) {
1162                         /* invalid param length for this param */
1163                         SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in error param- chunk left:%d errorlen:%d\n",
1164                             chklen, error_len);
1165                         return (0);
1166                 }
1167                 if (error == 0) {
1168                         /* report the first error cause */
1169                         error = error_type;
1170                 }
1171                 switch (error_type) {
1172                 case SCTP_CAUSE_INVALID_STREAM:
1173                 case SCTP_CAUSE_MISSING_PARAM:
1174                 case SCTP_CAUSE_INVALID_PARAM:
1175                 case SCTP_CAUSE_NO_USER_DATA:
1176                         SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %d back? We have a bug :/ (or do they?)\n",
1177                             error_type);
1178                         break;
1179                 case SCTP_CAUSE_NAT_COLLIDING_STATE:
1180                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n",
1181                             ch->chunk_flags);
1182                         if (sctp_handle_nat_colliding_state(stcb)) {
1183                                 return (0);
1184                         }
1185                         break;
1186                 case SCTP_CAUSE_NAT_MISSING_STATE:
1187                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n",
1188                             ch->chunk_flags);
1189                         if (sctp_handle_nat_missing_state(stcb, net)) {
1190                                 return (0);
1191                         }
1192                         break;
1193                 case SCTP_CAUSE_STALE_COOKIE:
1194                         /*
1195                          * We only act if we have echoed a cookie and are
1196                          * waiting.
1197                          */
1198                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) {
1199                                 int *p;
1200
1201                                 p = (int *)((caddr_t)phdr + sizeof(*phdr));
1202                                 /* Save the time doubled */
1203                                 asoc->cookie_preserve_req = ntohl(*p) << 1;
1204                                 asoc->stale_cookie_count++;
1205                                 if (asoc->stale_cookie_count >
1206                                     asoc->max_init_times) {
1207                                         sctp_abort_notification(stcb, 0, 0, NULL, SCTP_SO_NOT_LOCKED);
1208                                         /* now free the asoc */
1209 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1210                                         so = SCTP_INP_SO(stcb->sctp_ep);
1211                                         atomic_add_int(&stcb->asoc.refcnt, 1);
1212                                         SCTP_TCB_UNLOCK(stcb);
1213                                         SCTP_SOCKET_LOCK(so, 1);
1214                                         SCTP_TCB_LOCK(stcb);
1215                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
1216 #endif
1217                                         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1218                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_11);
1219 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1220                                         SCTP_SOCKET_UNLOCK(so, 1);
1221 #endif
1222                                         return (-1);
1223                                 }
1224                                 /* blast back to INIT state */
1225                                 sctp_toss_old_cookies(stcb, &stcb->asoc);
1226                                 asoc->state &= ~SCTP_STATE_COOKIE_ECHOED;
1227                                 asoc->state |= SCTP_STATE_COOKIE_WAIT;
1228                                 sctp_stop_all_cookie_timers(stcb);
1229                                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
1230                         }
1231                         break;
1232                 case SCTP_CAUSE_UNRESOLVABLE_ADDR:
1233                         /*
1234                          * Nothing we can do here, we don't do hostname
1235                          * addresses so if the peer does not like my IPv6
1236                          * (or IPv4 for that matter) it does not matter. If
1237                          * they don't support that type of address, they can
1238                          * NOT possibly get that packet type... i.e. with no
1239                          * IPv6 you can't recieve a IPv6 packet. so we can
1240                          * safely ignore this one. If we ever added support
1241                          * for HOSTNAME Addresses, then we would need to do
1242                          * something here.
1243                          */
1244                         break;
1245                 case SCTP_CAUSE_UNRECOG_CHUNK:
1246                         sctp_process_unrecog_chunk(stcb, phdr, net);
1247                         break;
1248                 case SCTP_CAUSE_UNRECOG_PARAM:
1249                         sctp_process_unrecog_param(stcb, phdr);
1250                         break;
1251                 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN:
1252                         /*
1253                          * We ignore this since the timer will drive out a
1254                          * new cookie anyway and there timer will drive us
1255                          * to send a SHUTDOWN_COMPLETE. We can't send one
1256                          * here since we don't have their tag.
1257                          */
1258                         break;
1259                 case SCTP_CAUSE_DELETING_LAST_ADDR:
1260                 case SCTP_CAUSE_RESOURCE_SHORTAGE:
1261                 case SCTP_CAUSE_DELETING_SRC_ADDR:
1262                         /*
1263                          * We should NOT get these here, but in a
1264                          * ASCONF-ACK.
1265                          */
1266                         SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a Operational Error?<%d>?\n",
1267                             error_type);
1268                         break;
1269                 case SCTP_CAUSE_OUT_OF_RESC:
1270                         /*
1271                          * And what, pray tell do we do with the fact that
1272                          * the peer is out of resources? Not really sure we
1273                          * could do anything but abort. I suspect this
1274                          * should have came WITH an abort instead of in a
1275                          * OP-ERROR.
1276                          */
1277                         break;
1278                 default:
1279                         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown error type = 0x%xh\n",
1280                             error_type);
1281                         break;
1282                 }
1283                 adjust = SCTP_SIZE32(error_len);
1284                 chklen -= adjust;
1285                 phdr = (struct sctp_paramhdr *)((caddr_t)phdr + adjust);
1286         }
1287         sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, error, ch, SCTP_SO_NOT_LOCKED);
1288         return (0);
1289 }
1290
1291 static int
1292 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset,
1293     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
1294     struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
1295     struct sctp_nets *net, int *abort_no_unlock,
1296     uint8_t use_mflowid, uint32_t mflowid,
1297     uint32_t vrf_id)
1298 {
1299         struct sctp_init_ack *init_ack;
1300         struct mbuf *op_err;
1301
1302         SCTPDBG(SCTP_DEBUG_INPUT2,
1303             "sctp_handle_init_ack: handling INIT-ACK\n");
1304
1305         if (stcb == NULL) {
1306                 SCTPDBG(SCTP_DEBUG_INPUT2,
1307                     "sctp_handle_init_ack: TCB is null\n");
1308                 return (-1);
1309         }
1310         if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) {
1311                 /* Invalid length */
1312                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
1313                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1314                     src, dst, sh, op_err,
1315                     use_mflowid, mflowid,
1316                     vrf_id, net->port);
1317                 *abort_no_unlock = 1;
1318                 return (-1);
1319         }
1320         init_ack = &cp->init;
1321         /* validate parameters */
1322         if (init_ack->initiate_tag == 0) {
1323                 /* protocol error... send an abort */
1324                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
1325                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1326                     src, dst, sh, op_err,
1327                     use_mflowid, mflowid,
1328                     vrf_id, net->port);
1329                 *abort_no_unlock = 1;
1330                 return (-1);
1331         }
1332         if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) {
1333                 /* protocol error... send an abort */
1334                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
1335                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1336                     src, dst, sh, op_err,
1337                     use_mflowid, mflowid,
1338                     vrf_id, net->port);
1339                 *abort_no_unlock = 1;
1340                 return (-1);
1341         }
1342         if (init_ack->num_inbound_streams == 0) {
1343                 /* protocol error... send an abort */
1344                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
1345                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1346                     src, dst, sh, op_err,
1347                     use_mflowid, mflowid,
1348                     vrf_id, net->port);
1349                 *abort_no_unlock = 1;
1350                 return (-1);
1351         }
1352         if (init_ack->num_outbound_streams == 0) {
1353                 /* protocol error... send an abort */
1354                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
1355                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1356                     src, dst, sh, op_err,
1357                     use_mflowid, mflowid,
1358                     vrf_id, net->port);
1359                 *abort_no_unlock = 1;
1360                 return (-1);
1361         }
1362         /* process according to association state... */
1363         switch (stcb->asoc.state & SCTP_STATE_MASK) {
1364         case SCTP_STATE_COOKIE_WAIT:
1365                 /* this is the expected state for this chunk */
1366                 /* process the INIT-ACK parameters */
1367                 if (stcb->asoc.primary_destination->dest_state &
1368                     SCTP_ADDR_UNCONFIRMED) {
1369                         /*
1370                          * The primary is where we sent the INIT, we can
1371                          * always consider it confirmed when the INIT-ACK is
1372                          * returned. Do this before we load addresses
1373                          * though.
1374                          */
1375                         stcb->asoc.primary_destination->dest_state &=
1376                             ~SCTP_ADDR_UNCONFIRMED;
1377                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
1378                             stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED);
1379                 }
1380                 if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb,
1381                     net, abort_no_unlock,
1382                     use_mflowid, mflowid,
1383                     vrf_id) < 0) {
1384                         /* error in parsing parameters */
1385                         return (-1);
1386                 }
1387                 /* update our state */
1388                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n");
1389                 SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_ECHOED);
1390
1391                 /* reset the RTO calc */
1392                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
1393                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
1394                             stcb->asoc.overall_error_count,
1395                             0,
1396                             SCTP_FROM_SCTP_INPUT,
1397                             __LINE__);
1398                 }
1399                 stcb->asoc.overall_error_count = 0;
1400                 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
1401                 /*
1402                  * collapse the init timer back in case of a exponential
1403                  * backoff
1404                  */
1405                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep,
1406                     stcb, net);
1407                 /*
1408                  * the send at the end of the inbound data processing will
1409                  * cause the cookie to be sent
1410                  */
1411                 break;
1412         case SCTP_STATE_SHUTDOWN_SENT:
1413                 /* incorrect state... discard */
1414                 break;
1415         case SCTP_STATE_COOKIE_ECHOED:
1416                 /* incorrect state... discard */
1417                 break;
1418         case SCTP_STATE_OPEN:
1419                 /* incorrect state... discard */
1420                 break;
1421         case SCTP_STATE_EMPTY:
1422         case SCTP_STATE_INUSE:
1423         default:
1424                 /* incorrect state... discard */
1425                 return (-1);
1426                 break;
1427         }
1428         SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n");
1429         return (0);
1430 }
1431
1432 static struct sctp_tcb *
1433 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
1434     struct sockaddr *src, struct sockaddr *dst,
1435     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1436     struct sctp_inpcb *inp, struct sctp_nets **netp,
1437     struct sockaddr *init_src, int *notification,
1438     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1439     uint8_t use_mflowid, uint32_t mflowid,
1440     uint32_t vrf_id, uint16_t port);
1441
1442
1443 /*
1444  * handle a state cookie for an existing association m: input packet mbuf
1445  * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a
1446  * "split" mbuf and the cookie signature does not exist offset: offset into
1447  * mbuf to the cookie-echo chunk
1448  */
1449 static struct sctp_tcb *
1450 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset,
1451     struct sockaddr *src, struct sockaddr *dst,
1452     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1453     struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp,
1454     struct sockaddr *init_src, int *notification,
1455     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1456     uint8_t use_mflowid, uint32_t mflowid,
1457     uint32_t vrf_id, uint16_t port)
1458 {
1459         struct sctp_association *asoc;
1460         struct sctp_init_chunk *init_cp, init_buf;
1461         struct sctp_init_ack_chunk *initack_cp, initack_buf;
1462         struct sctp_nets *net;
1463         struct mbuf *op_err;
1464         struct sctp_paramhdr *ph;
1465         int init_offset, initack_offset, i;
1466         int retval;
1467         int spec_flag = 0;
1468         uint32_t how_indx;
1469
1470         net = *netp;
1471         /* I know that the TCB is non-NULL from the caller */
1472         asoc = &stcb->asoc;
1473         for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) {
1474                 if (asoc->cookie_how[how_indx] == 0)
1475                         break;
1476         }
1477         if (how_indx < sizeof(asoc->cookie_how)) {
1478                 asoc->cookie_how[how_indx] = 1;
1479         }
1480         if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
1481                 /* SHUTDOWN came in after sending INIT-ACK */
1482                 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination);
1483                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
1484                     0, M_DONTWAIT, 1, MT_DATA);
1485                 if (op_err == NULL) {
1486                         /* FOOBAR */
1487                         return (NULL);
1488                 }
1489                 /* Set the len */
1490                 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_paramhdr);
1491                 ph = mtod(op_err, struct sctp_paramhdr *);
1492                 ph->param_type = htons(SCTP_CAUSE_COOKIE_IN_SHUTDOWN);
1493                 ph->param_length = htons(sizeof(struct sctp_paramhdr));
1494                 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
1495                     use_mflowid, mflowid,
1496                     vrf_id, net->port);
1497                 if (how_indx < sizeof(asoc->cookie_how))
1498                         asoc->cookie_how[how_indx] = 2;
1499                 return (NULL);
1500         }
1501         /*
1502          * find and validate the INIT chunk in the cookie (peer's info) the
1503          * INIT should start after the cookie-echo header struct (chunk
1504          * header, state cookie header struct)
1505          */
1506         init_offset = offset += sizeof(struct sctp_cookie_echo_chunk);
1507
1508         init_cp = (struct sctp_init_chunk *)
1509             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
1510             (uint8_t *) & init_buf);
1511         if (init_cp == NULL) {
1512                 /* could not pull a INIT chunk in cookie */
1513                 return (NULL);
1514         }
1515         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
1516                 return (NULL);
1517         }
1518         /*
1519          * find and validate the INIT-ACK chunk in the cookie (my info) the
1520          * INIT-ACK follows the INIT chunk
1521          */
1522         initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
1523         initack_cp = (struct sctp_init_ack_chunk *)
1524             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
1525             (uint8_t *) & initack_buf);
1526         if (initack_cp == NULL) {
1527                 /* could not pull INIT-ACK chunk in cookie */
1528                 return (NULL);
1529         }
1530         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
1531                 return (NULL);
1532         }
1533         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1534             (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) {
1535                 /*
1536                  * case D in Section 5.2.4 Table 2: MMAA process accordingly
1537                  * to get into the OPEN state
1538                  */
1539                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1540                         /*-
1541                          * Opps, this means that we somehow generated two vtag's
1542                          * the same. I.e. we did:
1543                          *  Us               Peer
1544                          *   <---INIT(tag=a)------
1545                          *   ----INIT-ACK(tag=t)-->
1546                          *   ----INIT(tag=t)------> *1
1547                          *   <---INIT-ACK(tag=a)---
1548                          *   <----CE(tag=t)------------- *2
1549                          *
1550                          * At point *1 we should be generating a different
1551                          * tag t'. Which means we would throw away the CE and send
1552                          * ours instead. Basically this is case C (throw away side).
1553                          */
1554                         if (how_indx < sizeof(asoc->cookie_how))
1555                                 asoc->cookie_how[how_indx] = 17;
1556                         return (NULL);
1557
1558                 }
1559                 switch SCTP_GET_STATE
1560                         (asoc) {
1561                 case SCTP_STATE_COOKIE_WAIT:
1562                 case SCTP_STATE_COOKIE_ECHOED:
1563                         /*
1564                          * INIT was sent but got a COOKIE_ECHO with the
1565                          * correct tags... just accept it...but we must
1566                          * process the init so that we can make sure we have
1567                          * the right seq no's.
1568                          */
1569                         /* First we must process the INIT !! */
1570                         retval = sctp_process_init(init_cp, stcb);
1571                         if (retval < 0) {
1572                                 if (how_indx < sizeof(asoc->cookie_how))
1573                                         asoc->cookie_how[how_indx] = 3;
1574                                 return (NULL);
1575                         }
1576                         /* we have already processed the INIT so no problem */
1577                         sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb,
1578                             net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_12);
1579                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_13);
1580                         /* update current state */
1581                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)
1582                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1583                         else
1584                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1585
1586                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1587                         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1588                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1589                                     stcb->sctp_ep, stcb, asoc->primary_destination);
1590                         }
1591                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1592                         sctp_stop_all_cookie_timers(stcb);
1593                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1594                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1595                             (inp->sctp_socket->so_qlimit == 0)
1596                             ) {
1597 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1598                                 struct socket *so;
1599
1600 #endif
1601                                 /*
1602                                  * Here is where collision would go if we
1603                                  * did a connect() and instead got a
1604                                  * init/init-ack/cookie done before the
1605                                  * init-ack came back..
1606                                  */
1607                                 stcb->sctp_ep->sctp_flags |=
1608                                     SCTP_PCB_FLAGS_CONNECTED;
1609 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1610                                 so = SCTP_INP_SO(stcb->sctp_ep);
1611                                 atomic_add_int(&stcb->asoc.refcnt, 1);
1612                                 SCTP_TCB_UNLOCK(stcb);
1613                                 SCTP_SOCKET_LOCK(so, 1);
1614                                 SCTP_TCB_LOCK(stcb);
1615                                 atomic_add_int(&stcb->asoc.refcnt, -1);
1616                                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1617                                         SCTP_SOCKET_UNLOCK(so, 1);
1618                                         return (NULL);
1619                                 }
1620 #endif
1621                                 soisconnected(stcb->sctp_socket);
1622 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1623                                 SCTP_SOCKET_UNLOCK(so, 1);
1624 #endif
1625                         }
1626                         /* notify upper layer */
1627                         *notification = SCTP_NOTIFY_ASSOC_UP;
1628                         /*
1629                          * since we did not send a HB make sure we don't
1630                          * double things
1631                          */
1632                         net->hb_responded = 1;
1633                         net->RTO = sctp_calculate_rto(stcb, asoc, net,
1634                             &cookie->time_entered,
1635                             sctp_align_unsafe_makecopy,
1636                             SCTP_RTT_FROM_NON_DATA);
1637
1638                         if (stcb->asoc.sctp_autoclose_ticks &&
1639                             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) {
1640                                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
1641                                     inp, stcb, NULL);
1642                         }
1643                         break;
1644                 default:
1645                         /*
1646                          * we're in the OPEN state (or beyond), so peer must
1647                          * have simply lost the COOKIE-ACK
1648                          */
1649                         break;
1650                         }       /* end switch */
1651                 sctp_stop_all_cookie_timers(stcb);
1652                 /*
1653                  * We ignore the return code here.. not sure if we should
1654                  * somehow abort.. but we do have an existing asoc. This
1655                  * really should not fail.
1656                  */
1657                 if (sctp_load_addresses_from_init(stcb, m,
1658                     init_offset + sizeof(struct sctp_init_chunk),
1659                     initack_offset, src, dst, init_src)) {
1660                         if (how_indx < sizeof(asoc->cookie_how))
1661                                 asoc->cookie_how[how_indx] = 4;
1662                         return (NULL);
1663                 }
1664                 /* respond with a COOKIE-ACK */
1665                 sctp_toss_old_cookies(stcb, asoc);
1666                 sctp_send_cookie_ack(stcb);
1667                 if (how_indx < sizeof(asoc->cookie_how))
1668                         asoc->cookie_how[how_indx] = 5;
1669                 return (stcb);
1670         }
1671         if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1672             ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag &&
1673             cookie->tie_tag_my_vtag == 0 &&
1674             cookie->tie_tag_peer_vtag == 0) {
1675                 /*
1676                  * case C in Section 5.2.4 Table 2: XMOO silently discard
1677                  */
1678                 if (how_indx < sizeof(asoc->cookie_how))
1679                         asoc->cookie_how[how_indx] = 6;
1680                 return (NULL);
1681         }
1682         /*
1683          * If nat support, and the below and stcb is established, send back
1684          * a ABORT(colliding state) if we are established.
1685          */
1686         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) &&
1687             (asoc->peer_supports_nat) &&
1688             ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1689             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1690             (asoc->peer_vtag == 0)))) {
1691                 /*
1692                  * Special case - Peer's support nat. We may have two init's
1693                  * that we gave out the same tag on since one was not
1694                  * established.. i.e. we get INIT from host-1 behind the nat
1695                  * and we respond tag-a, we get a INIT from host-2 behind
1696                  * the nat and we get tag-a again. Then we bring up host-1
1697                  * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1).
1698                  * Now we have colliding state. We must send an abort here
1699                  * with colliding state indication.
1700                  */
1701                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
1702                     0, M_DONTWAIT, 1, MT_DATA);
1703                 if (op_err == NULL) {
1704                         /* FOOBAR */
1705                         return (NULL);
1706                 }
1707                 /* pre-reserve some space */
1708 #ifdef INET6
1709                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
1710 #else
1711                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
1712 #endif
1713                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
1714                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
1715                 /* Set the len */
1716                 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_paramhdr);
1717                 ph = mtod(op_err, struct sctp_paramhdr *);
1718                 ph->param_type = htons(SCTP_CAUSE_NAT_COLLIDING_STATE);
1719                 ph->param_length = htons(sizeof(struct sctp_paramhdr));
1720                 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err,
1721                     use_mflowid, mflowid,
1722                     vrf_id, port);
1723                 return (NULL);
1724         }
1725         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1726             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1727             (asoc->peer_vtag == 0))) {
1728                 /*
1729                  * case B in Section 5.2.4 Table 2: MXAA or MOAA my info
1730                  * should be ok, re-accept peer info
1731                  */
1732                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1733                         /*
1734                          * Extension of case C. If we hit this, then the
1735                          * random number generator returned the same vtag
1736                          * when we first sent our INIT-ACK and when we later
1737                          * sent our INIT. The side with the seq numbers that
1738                          * are different will be the one that normnally
1739                          * would have hit case C. This in effect "extends"
1740                          * our vtags in this collision case to be 64 bits.
1741                          * The same collision could occur aka you get both
1742                          * vtag and seq number the same twice in a row.. but
1743                          * is much less likely. If it did happen then we
1744                          * would proceed through and bring up the assoc.. we
1745                          * may end up with the wrong stream setup however..
1746                          * which would be bad.. but there is no way to
1747                          * tell.. until we send on a stream that does not
1748                          * exist :-)
1749                          */
1750                         if (how_indx < sizeof(asoc->cookie_how))
1751                                 asoc->cookie_how[how_indx] = 7;
1752
1753                         return (NULL);
1754                 }
1755                 if (how_indx < sizeof(asoc->cookie_how))
1756                         asoc->cookie_how[how_indx] = 8;
1757                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_14);
1758                 sctp_stop_all_cookie_timers(stcb);
1759                 /*
1760                  * since we did not send a HB make sure we don't double
1761                  * things
1762                  */
1763                 net->hb_responded = 1;
1764                 if (stcb->asoc.sctp_autoclose_ticks &&
1765                     sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
1766                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb,
1767                             NULL);
1768                 }
1769                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1770                 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
1771
1772                 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) {
1773                         /*
1774                          * Ok the peer probably discarded our data (if we
1775                          * echoed a cookie+data). So anything on the
1776                          * sent_queue should be marked for retransmit, we
1777                          * may not get something to kick us so it COULD
1778                          * still take a timeout to move these.. but it can't
1779                          * hurt to mark them.
1780                          */
1781                         struct sctp_tmit_chunk *chk;
1782
1783                         TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
1784                                 if (chk->sent < SCTP_DATAGRAM_RESEND) {
1785                                         chk->sent = SCTP_DATAGRAM_RESEND;
1786                                         sctp_flight_size_decrease(chk);
1787                                         sctp_total_flight_decrease(stcb, chk);
1788                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1789                                         spec_flag++;
1790                                 }
1791                         }
1792
1793                 }
1794                 /* process the INIT info (peer's info) */
1795                 retval = sctp_process_init(init_cp, stcb);
1796                 if (retval < 0) {
1797                         if (how_indx < sizeof(asoc->cookie_how))
1798                                 asoc->cookie_how[how_indx] = 9;
1799                         return (NULL);
1800                 }
1801                 if (sctp_load_addresses_from_init(stcb, m,
1802                     init_offset + sizeof(struct sctp_init_chunk),
1803                     initack_offset, src, dst, init_src)) {
1804                         if (how_indx < sizeof(asoc->cookie_how))
1805                                 asoc->cookie_how[how_indx] = 10;
1806                         return (NULL);
1807                 }
1808                 if ((asoc->state & SCTP_STATE_COOKIE_WAIT) ||
1809                     (asoc->state & SCTP_STATE_COOKIE_ECHOED)) {
1810                         *notification = SCTP_NOTIFY_ASSOC_UP;
1811
1812                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1813                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1814                             (inp->sctp_socket->so_qlimit == 0)) {
1815 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1816                                 struct socket *so;
1817
1818 #endif
1819                                 stcb->sctp_ep->sctp_flags |=
1820                                     SCTP_PCB_FLAGS_CONNECTED;
1821 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1822                                 so = SCTP_INP_SO(stcb->sctp_ep);
1823                                 atomic_add_int(&stcb->asoc.refcnt, 1);
1824                                 SCTP_TCB_UNLOCK(stcb);
1825                                 SCTP_SOCKET_LOCK(so, 1);
1826                                 SCTP_TCB_LOCK(stcb);
1827                                 atomic_add_int(&stcb->asoc.refcnt, -1);
1828                                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1829                                         SCTP_SOCKET_UNLOCK(so, 1);
1830                                         return (NULL);
1831                                 }
1832 #endif
1833                                 soisconnected(stcb->sctp_socket);
1834 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1835                                 SCTP_SOCKET_UNLOCK(so, 1);
1836 #endif
1837                         }
1838                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)
1839                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1840                         else
1841                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1842                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1843                 } else if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
1844                         SCTP_STAT_INCR_COUNTER32(sctps_restartestab);
1845                 } else {
1846                         SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1847                 }
1848                 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1849                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1850                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1851                             stcb->sctp_ep, stcb, asoc->primary_destination);
1852                 }
1853                 sctp_stop_all_cookie_timers(stcb);
1854                 sctp_toss_old_cookies(stcb, asoc);
1855                 sctp_send_cookie_ack(stcb);
1856                 if (spec_flag) {
1857                         /*
1858                          * only if we have retrans set do we do this. What
1859                          * this call does is get only the COOKIE-ACK out and
1860                          * then when we return the normal call to
1861                          * sctp_chunk_output will get the retrans out behind
1862                          * this.
1863                          */
1864                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED);
1865                 }
1866                 if (how_indx < sizeof(asoc->cookie_how))
1867                         asoc->cookie_how[how_indx] = 11;
1868
1869                 return (stcb);
1870         }
1871         if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1872             ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) &&
1873             cookie->tie_tag_my_vtag == asoc->my_vtag_nonce &&
1874             cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce &&
1875             cookie->tie_tag_peer_vtag != 0) {
1876                 struct sctpasochead *head;
1877
1878                 if (asoc->peer_supports_nat) {
1879                         /*
1880                          * This is a gross gross hack. just call the
1881                          * cookie_new code since we are allowing a duplicate
1882                          * association. I hope this works...
1883                          */
1884                         return (sctp_process_cookie_new(m, iphlen, offset, src, dst,
1885                             sh, cookie, cookie_len,
1886                             inp, netp, init_src, notification,
1887                             auth_skipped, auth_offset, auth_len,
1888                             use_mflowid, mflowid,
1889                             vrf_id, port));
1890                 }
1891                 /*
1892                  * case A in Section 5.2.4 Table 2: XXMM (peer restarted)
1893                  */
1894                 /* temp code */
1895                 if (how_indx < sizeof(asoc->cookie_how))
1896                         asoc->cookie_how[how_indx] = 12;
1897                 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_15);
1898                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
1899
1900                 /* notify upper layer */
1901                 *notification = SCTP_NOTIFY_ASSOC_RESTART;
1902                 atomic_add_int(&stcb->asoc.refcnt, 1);
1903                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_OPEN) &&
1904                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
1905                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) {
1906                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1907                 }
1908                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
1909                         SCTP_STAT_INCR_GAUGE32(sctps_restartestab);
1910                 } else if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) {
1911                         SCTP_STAT_INCR_GAUGE32(sctps_collisionestab);
1912                 }
1913                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1914                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1915                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1916                             stcb->sctp_ep, stcb, asoc->primary_destination);
1917
1918                 } else if (!(asoc->state & SCTP_STATE_SHUTDOWN_SENT)) {
1919                         /* move to OPEN state, if not in SHUTDOWN_SENT */
1920                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1921                 }
1922                 asoc->pre_open_streams =
1923                     ntohs(initack_cp->init.num_outbound_streams);
1924                 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
1925                 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
1926                 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
1927
1928                 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
1929
1930                 asoc->str_reset_seq_in = asoc->init_seq_number;
1931
1932                 asoc->advanced_peer_ack_point = asoc->last_acked_seq;
1933                 if (asoc->mapping_array) {
1934                         memset(asoc->mapping_array, 0,
1935                             asoc->mapping_array_size);
1936                 }
1937                 if (asoc->nr_mapping_array) {
1938                         memset(asoc->nr_mapping_array, 0,
1939                             asoc->mapping_array_size);
1940                 }
1941                 SCTP_TCB_UNLOCK(stcb);
1942                 SCTP_INP_INFO_WLOCK();
1943                 SCTP_INP_WLOCK(stcb->sctp_ep);
1944                 SCTP_TCB_LOCK(stcb);
1945                 atomic_add_int(&stcb->asoc.refcnt, -1);
1946                 /* send up all the data */
1947                 SCTP_TCB_SEND_LOCK(stcb);
1948
1949                 sctp_report_all_outbound(stcb, 0, 1, SCTP_SO_NOT_LOCKED);
1950                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
1951                         stcb->asoc.strmout[i].chunks_on_queues = 0;
1952                         stcb->asoc.strmout[i].stream_no = i;
1953                         stcb->asoc.strmout[i].next_sequence_send = 0;
1954                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
1955                 }
1956                 /* process the INIT-ACK info (my info) */
1957                 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
1958                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1959
1960                 /* pull from vtag hash */
1961                 LIST_REMOVE(stcb, sctp_asocs);
1962                 /* re-insert to new vtag position */
1963                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag,
1964                     SCTP_BASE_INFO(hashasocmark))];
1965                 /*
1966                  * put it in the bucket in the vtag hash of assoc's for the
1967                  * system
1968                  */
1969                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
1970
1971                 /* process the INIT info (peer's info) */
1972                 SCTP_TCB_SEND_UNLOCK(stcb);
1973                 SCTP_INP_WUNLOCK(stcb->sctp_ep);
1974                 SCTP_INP_INFO_WUNLOCK();
1975
1976                 retval = sctp_process_init(init_cp, stcb);
1977                 if (retval < 0) {
1978                         if (how_indx < sizeof(asoc->cookie_how))
1979                                 asoc->cookie_how[how_indx] = 13;
1980
1981                         return (NULL);
1982                 }
1983                 /*
1984                  * since we did not send a HB make sure we don't double
1985                  * things
1986                  */
1987                 net->hb_responded = 1;
1988
1989                 if (sctp_load_addresses_from_init(stcb, m,
1990                     init_offset + sizeof(struct sctp_init_chunk),
1991                     initack_offset, src, dst, init_src)) {
1992                         if (how_indx < sizeof(asoc->cookie_how))
1993                                 asoc->cookie_how[how_indx] = 14;
1994
1995                         return (NULL);
1996                 }
1997                 /* respond with a COOKIE-ACK */
1998                 sctp_stop_all_cookie_timers(stcb);
1999                 sctp_toss_old_cookies(stcb, asoc);
2000                 sctp_send_cookie_ack(stcb);
2001                 if (how_indx < sizeof(asoc->cookie_how))
2002                         asoc->cookie_how[how_indx] = 15;
2003
2004                 return (stcb);
2005         }
2006         if (how_indx < sizeof(asoc->cookie_how))
2007                 asoc->cookie_how[how_indx] = 16;
2008         /* all other cases... */
2009         return (NULL);
2010 }
2011
2012
2013 /*
2014  * handle a state cookie for a new association m: input packet mbuf chain--
2015  * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf
2016  * and the cookie signature does not exist offset: offset into mbuf to the
2017  * cookie-echo chunk length: length of the cookie chunk to: where the init
2018  * was from returns a new TCB
2019  */
2020 static struct sctp_tcb *
2021 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
2022     struct sockaddr *src, struct sockaddr *dst,
2023     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
2024     struct sctp_inpcb *inp, struct sctp_nets **netp,
2025     struct sockaddr *init_src, int *notification,
2026     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
2027     uint8_t use_mflowid, uint32_t mflowid,
2028     uint32_t vrf_id, uint16_t port)
2029 {
2030         struct sctp_tcb *stcb;
2031         struct sctp_init_chunk *init_cp, init_buf;
2032         struct sctp_init_ack_chunk *initack_cp, initack_buf;
2033         struct sockaddr_storage sa_store;
2034         struct sockaddr *initack_src = (struct sockaddr *)&sa_store;
2035         struct sctp_association *asoc;
2036         int init_offset, initack_offset, initack_limit;
2037         int retval;
2038         int error = 0;
2039         uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE];
2040
2041 #ifdef INET
2042         struct sockaddr_in *sin;
2043
2044 #endif
2045 #ifdef INET6
2046         struct sockaddr_in6 *sin6;
2047
2048 #endif
2049 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2050         struct socket *so;
2051
2052         so = SCTP_INP_SO(inp);
2053 #endif
2054
2055         /*
2056          * find and validate the INIT chunk in the cookie (peer's info) the
2057          * INIT should start after the cookie-echo header struct (chunk
2058          * header, state cookie header struct)
2059          */
2060         init_offset = offset + sizeof(struct sctp_cookie_echo_chunk);
2061         init_cp = (struct sctp_init_chunk *)
2062             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
2063             (uint8_t *) & init_buf);
2064         if (init_cp == NULL) {
2065                 /* could not pull a INIT chunk in cookie */
2066                 SCTPDBG(SCTP_DEBUG_INPUT1,
2067                     "process_cookie_new: could not pull INIT chunk hdr\n");
2068                 return (NULL);
2069         }
2070         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
2071                 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n");
2072                 return (NULL);
2073         }
2074         initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
2075         /*
2076          * find and validate the INIT-ACK chunk in the cookie (my info) the
2077          * INIT-ACK follows the INIT chunk
2078          */
2079         initack_cp = (struct sctp_init_ack_chunk *)
2080             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
2081             (uint8_t *) & initack_buf);
2082         if (initack_cp == NULL) {
2083                 /* could not pull INIT-ACK chunk in cookie */
2084                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n");
2085                 return (NULL);
2086         }
2087         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
2088                 return (NULL);
2089         }
2090         /*
2091          * NOTE: We can't use the INIT_ACK's chk_length to determine the
2092          * "initack_limit" value.  This is because the chk_length field
2093          * includes the length of the cookie, but the cookie is omitted when
2094          * the INIT and INIT_ACK are tacked onto the cookie...
2095          */
2096         initack_limit = offset + cookie_len;
2097
2098         /*
2099          * now that we know the INIT/INIT-ACK are in place, create a new TCB
2100          * and popluate
2101          */
2102
2103         /*
2104          * Here we do a trick, we set in NULL for the proc/thread argument.
2105          * We do this since in effect we only use the p argument when the
2106          * socket is unbound and we must do an implicit bind. Since we are
2107          * getting a cookie, we cannot be unbound.
2108          */
2109         stcb = sctp_aloc_assoc(inp, init_src, &error,
2110             ntohl(initack_cp->init.initiate_tag), vrf_id,
2111             (struct thread *)NULL
2112             );
2113         if (stcb == NULL) {
2114                 struct mbuf *op_err;
2115
2116                 /* memory problem? */
2117                 SCTPDBG(SCTP_DEBUG_INPUT1,
2118                     "process_cookie_new: no room for another TCB!\n");
2119                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC);
2120
2121                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2122                     src, dst, sh, op_err,
2123                     use_mflowid, mflowid,
2124                     vrf_id, port);
2125                 return (NULL);
2126         }
2127         /* get the correct sctp_nets */
2128         if (netp)
2129                 *netp = sctp_findnet(stcb, init_src);
2130
2131         asoc = &stcb->asoc;
2132         /* get scope variables out of cookie */
2133         asoc->scope.ipv4_local_scope = cookie->ipv4_scope;
2134         asoc->scope.site_scope = cookie->site_scope;
2135         asoc->scope.local_scope = cookie->local_scope;
2136         asoc->scope.loopback_scope = cookie->loopback_scope;
2137
2138         if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) ||
2139             (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) {
2140                 struct mbuf *op_err;
2141
2142                 /*
2143                  * Houston we have a problem. The EP changed while the
2144                  * cookie was in flight. Only recourse is to abort the
2145                  * association.
2146                  */
2147                 atomic_add_int(&stcb->asoc.refcnt, 1);
2148                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC);
2149                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2150                     src, dst, sh, op_err,
2151                     use_mflowid, mflowid,
2152                     vrf_id, port);
2153 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2154                 SCTP_TCB_UNLOCK(stcb);
2155                 SCTP_SOCKET_LOCK(so, 1);
2156                 SCTP_TCB_LOCK(stcb);
2157 #endif
2158                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2159                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
2160 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2161                 SCTP_SOCKET_UNLOCK(so, 1);
2162 #endif
2163                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2164                 return (NULL);
2165         }
2166         /* process the INIT-ACK info (my info) */
2167         asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
2168         asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
2169         asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
2170         asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
2171         asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
2172         asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
2173         asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
2174         asoc->str_reset_seq_in = asoc->init_seq_number;
2175
2176         asoc->advanced_peer_ack_point = asoc->last_acked_seq;
2177
2178         /* process the INIT info (peer's info) */
2179         if (netp)
2180                 retval = sctp_process_init(init_cp, stcb);
2181         else
2182                 retval = 0;
2183         if (retval < 0) {
2184                 atomic_add_int(&stcb->asoc.refcnt, 1);
2185 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2186                 SCTP_TCB_UNLOCK(stcb);
2187                 SCTP_SOCKET_LOCK(so, 1);
2188                 SCTP_TCB_LOCK(stcb);
2189 #endif
2190                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
2191 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2192                 SCTP_SOCKET_UNLOCK(so, 1);
2193 #endif
2194                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2195                 return (NULL);
2196         }
2197         /* load all addresses */
2198         if (sctp_load_addresses_from_init(stcb, m,
2199             init_offset + sizeof(struct sctp_init_chunk), initack_offset,
2200             src, dst, init_src)) {
2201                 atomic_add_int(&stcb->asoc.refcnt, 1);
2202 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2203                 SCTP_TCB_UNLOCK(stcb);
2204                 SCTP_SOCKET_LOCK(so, 1);
2205                 SCTP_TCB_LOCK(stcb);
2206 #endif
2207                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_17);
2208 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2209                 SCTP_SOCKET_UNLOCK(so, 1);
2210 #endif
2211                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2212                 return (NULL);
2213         }
2214         /*
2215          * verify any preceding AUTH chunk that was skipped
2216          */
2217         /* pull the local authentication parameters from the cookie/init-ack */
2218         sctp_auth_get_cookie_params(stcb, m,
2219             initack_offset + sizeof(struct sctp_init_ack_chunk),
2220             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)));
2221         if (auth_skipped) {
2222                 struct sctp_auth_chunk *auth;
2223
2224                 auth = (struct sctp_auth_chunk *)
2225                     sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf);
2226                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) {
2227                         /* auth HMAC failed, dump the assoc and packet */
2228                         SCTPDBG(SCTP_DEBUG_AUTH1,
2229                             "COOKIE-ECHO: AUTH failed\n");
2230                         atomic_add_int(&stcb->asoc.refcnt, 1);
2231 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2232                         SCTP_TCB_UNLOCK(stcb);
2233                         SCTP_SOCKET_LOCK(so, 1);
2234                         SCTP_TCB_LOCK(stcb);
2235 #endif
2236                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_18);
2237 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2238                         SCTP_SOCKET_UNLOCK(so, 1);
2239 #endif
2240                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
2241                         return (NULL);
2242                 } else {
2243                         /* remaining chunks checked... good to go */
2244                         stcb->asoc.authenticated = 1;
2245                 }
2246         }
2247         /* update current state */
2248         SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2249         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
2250         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2251                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2252                     stcb->sctp_ep, stcb, asoc->primary_destination);
2253         }
2254         sctp_stop_all_cookie_timers(stcb);
2255         SCTP_STAT_INCR_COUNTER32(sctps_passiveestab);
2256         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2257
2258         /*
2259          * if we're doing ASCONFs, check to see if we have any new local
2260          * addresses that need to get added to the peer (eg. addresses
2261          * changed while cookie echo in flight).  This needs to be done
2262          * after we go to the OPEN state to do the correct asconf
2263          * processing. else, make sure we have the correct addresses in our
2264          * lists
2265          */
2266
2267         /* warning, we re-use sin, sin6, sa_store here! */
2268         /* pull in local_address (our "from" address) */
2269         switch (cookie->laddr_type) {
2270 #ifdef INET
2271         case SCTP_IPV4_ADDRESS:
2272                 /* source addr is IPv4 */
2273                 sin = (struct sockaddr_in *)initack_src;
2274                 memset(sin, 0, sizeof(*sin));
2275                 sin->sin_family = AF_INET;
2276                 sin->sin_len = sizeof(struct sockaddr_in);
2277                 sin->sin_addr.s_addr = cookie->laddress[0];
2278                 break;
2279 #endif
2280 #ifdef INET6
2281         case SCTP_IPV6_ADDRESS:
2282                 /* source addr is IPv6 */
2283                 sin6 = (struct sockaddr_in6 *)initack_src;
2284                 memset(sin6, 0, sizeof(*sin6));
2285                 sin6->sin6_family = AF_INET6;
2286                 sin6->sin6_len = sizeof(struct sockaddr_in6);
2287                 sin6->sin6_scope_id = cookie->scope_id;
2288                 memcpy(&sin6->sin6_addr, cookie->laddress,
2289                     sizeof(sin6->sin6_addr));
2290                 break;
2291 #endif
2292         default:
2293                 atomic_add_int(&stcb->asoc.refcnt, 1);
2294 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2295                 SCTP_TCB_UNLOCK(stcb);
2296                 SCTP_SOCKET_LOCK(so, 1);
2297                 SCTP_TCB_LOCK(stcb);
2298 #endif
2299                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_19);
2300 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2301                 SCTP_SOCKET_UNLOCK(so, 1);
2302 #endif
2303                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2304                 return (NULL);
2305         }
2306
2307         /* set up to notify upper layer */
2308         *notification = SCTP_NOTIFY_ASSOC_UP;
2309         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2310             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
2311             (inp->sctp_socket->so_qlimit == 0)) {
2312                 /*
2313                  * This is an endpoint that called connect() how it got a
2314                  * cookie that is NEW is a bit of a mystery. It must be that
2315                  * the INIT was sent, but before it got there.. a complete
2316                  * INIT/INIT-ACK/COOKIE arrived. But of course then it
2317                  * should have went to the other code.. not here.. oh well..
2318                  * a bit of protection is worth having..
2319                  */
2320                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2321 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2322                 atomic_add_int(&stcb->asoc.refcnt, 1);
2323                 SCTP_TCB_UNLOCK(stcb);
2324                 SCTP_SOCKET_LOCK(so, 1);
2325                 SCTP_TCB_LOCK(stcb);
2326                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2327                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
2328                         SCTP_SOCKET_UNLOCK(so, 1);
2329                         return (NULL);
2330                 }
2331 #endif
2332                 soisconnected(stcb->sctp_socket);
2333 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2334                 SCTP_SOCKET_UNLOCK(so, 1);
2335 #endif
2336         } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
2337             (inp->sctp_socket->so_qlimit)) {
2338                 /*
2339                  * We don't want to do anything with this one. Since it is
2340                  * the listening guy. The timer will get started for
2341                  * accepted connections in the caller.
2342                  */
2343                 ;
2344         }
2345         /* since we did not send a HB make sure we don't double things */
2346         if ((netp) && (*netp))
2347                 (*netp)->hb_responded = 1;
2348
2349         if (stcb->asoc.sctp_autoclose_ticks &&
2350             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2351                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL);
2352         }
2353         /* calculate the RTT */
2354         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
2355         if ((netp) && (*netp)) {
2356                 (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp,
2357                     &cookie->time_entered, sctp_align_unsafe_makecopy,
2358                     SCTP_RTT_FROM_NON_DATA);
2359         }
2360         /* respond with a COOKIE-ACK */
2361         sctp_send_cookie_ack(stcb);
2362
2363         /*
2364          * check the address lists for any ASCONFs that need to be sent
2365          * AFTER the cookie-ack is sent
2366          */
2367         sctp_check_address_list(stcb, m,
2368             initack_offset + sizeof(struct sctp_init_ack_chunk),
2369             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)),
2370             initack_src, cookie->local_scope, cookie->site_scope,
2371             cookie->ipv4_scope, cookie->loopback_scope);
2372
2373
2374         return (stcb);
2375 }
2376
2377 /*
2378  * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e
2379  * we NEED to make sure we are not already using the vtag. If so we
2380  * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit!
2381         head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag,
2382                                                             SCTP_BASE_INFO(hashasocmark))];
2383         LIST_FOREACH(stcb, head, sctp_asocs) {
2384                 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep))  {
2385                        -- SEND ABORT - TRY AGAIN --
2386                 }
2387         }
2388 */
2389
2390 /*
2391  * handles a COOKIE-ECHO message stcb: modified to either a new or left as
2392  * existing (non-NULL) TCB
2393  */
2394 static struct mbuf *
2395 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset,
2396     struct sockaddr *src, struct sockaddr *dst,
2397     struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp,
2398     struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp,
2399     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
2400     struct sctp_tcb **locked_tcb,
2401     uint8_t use_mflowid, uint32_t mflowid,
2402     uint32_t vrf_id, uint16_t port)
2403 {
2404         struct sctp_state_cookie *cookie;
2405         struct sctp_tcb *l_stcb = *stcb;
2406         struct sctp_inpcb *l_inp;
2407         struct sockaddr *to;
2408         struct sctp_pcb *ep;
2409         struct mbuf *m_sig;
2410         uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE];
2411         uint8_t *sig;
2412         uint8_t cookie_ok = 0;
2413         unsigned int sig_offset, cookie_offset;
2414         unsigned int cookie_len;
2415         struct timeval now;
2416         struct timeval time_expires;
2417         int notification = 0;
2418         struct sctp_nets *netl;
2419         int had_a_existing_tcb = 0;
2420         int send_int_conf = 0;
2421
2422 #ifdef INET
2423         struct sockaddr_in sin;
2424
2425 #endif
2426 #ifdef INET6
2427         struct sockaddr_in6 sin6;
2428
2429 #endif
2430
2431         SCTPDBG(SCTP_DEBUG_INPUT2,
2432             "sctp_handle_cookie: handling COOKIE-ECHO\n");
2433
2434         if (inp_p == NULL) {
2435                 return (NULL);
2436         }
2437         cookie = &cp->cookie;
2438         cookie_offset = offset + sizeof(struct sctp_chunkhdr);
2439         cookie_len = ntohs(cp->ch.chunk_length);
2440
2441         if ((cookie->peerport != sh->src_port) &&
2442             (cookie->myport != sh->dest_port) &&
2443             (cookie->my_vtag != sh->v_tag)) {
2444                 /*
2445                  * invalid ports or bad tag.  Note that we always leave the
2446                  * v_tag in the header in network order and when we stored
2447                  * it in the my_vtag slot we also left it in network order.
2448                  * This maintains the match even though it may be in the
2449                  * opposite byte order of the machine :->
2450                  */
2451                 return (NULL);
2452         }
2453         if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) +
2454             sizeof(struct sctp_init_chunk) +
2455             sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) {
2456                 /* cookie too small */
2457                 return (NULL);
2458         }
2459         /*
2460          * split off the signature into its own mbuf (since it should not be
2461          * calculated in the sctp_hmac_m() call).
2462          */
2463         sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE;
2464         m_sig = m_split(m, sig_offset, M_DONTWAIT);
2465         if (m_sig == NULL) {
2466                 /* out of memory or ?? */
2467                 return (NULL);
2468         }
2469 #ifdef SCTP_MBUF_LOGGING
2470         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
2471                 struct mbuf *mat;
2472
2473                 for (mat = m_sig; mat; mat = SCTP_BUF_NEXT(mat)) {
2474                         if (SCTP_BUF_IS_EXTENDED(mat)) {
2475                                 sctp_log_mb(mat, SCTP_MBUF_SPLIT);
2476                         }
2477                 }
2478         }
2479 #endif
2480
2481         /*
2482          * compute the signature/digest for the cookie
2483          */
2484         ep = &(*inp_p)->sctp_ep;
2485         l_inp = *inp_p;
2486         if (l_stcb) {
2487                 SCTP_TCB_UNLOCK(l_stcb);
2488         }
2489         SCTP_INP_RLOCK(l_inp);
2490         if (l_stcb) {
2491                 SCTP_TCB_LOCK(l_stcb);
2492         }
2493         /* which cookie is it? */
2494         if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) &&
2495             (ep->current_secret_number != ep->last_secret_number)) {
2496                 /* it's the old cookie */
2497                 (void)sctp_hmac_m(SCTP_HMAC,
2498                     (uint8_t *) ep->secret_key[(int)ep->last_secret_number],
2499                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2500         } else {
2501                 /* it's the current cookie */
2502                 (void)sctp_hmac_m(SCTP_HMAC,
2503                     (uint8_t *) ep->secret_key[(int)ep->current_secret_number],
2504                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2505         }
2506         /* get the signature */
2507         SCTP_INP_RUNLOCK(l_inp);
2508         sig = (uint8_t *) sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *) & tmp_sig);
2509         if (sig == NULL) {
2510                 /* couldn't find signature */
2511                 sctp_m_freem(m_sig);
2512                 return (NULL);
2513         }
2514         /* compare the received digest with the computed digest */
2515         if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) {
2516                 /* try the old cookie? */
2517                 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) &&
2518                     (ep->current_secret_number != ep->last_secret_number)) {
2519                         /* compute digest with old */
2520                         (void)sctp_hmac_m(SCTP_HMAC,
2521                             (uint8_t *) ep->secret_key[(int)ep->last_secret_number],
2522                             SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2523                         /* compare */
2524                         if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0)
2525                                 cookie_ok = 1;
2526                 }
2527         } else {
2528                 cookie_ok = 1;
2529         }
2530
2531         /*
2532          * Now before we continue we must reconstruct our mbuf so that
2533          * normal processing of any other chunks will work.
2534          */
2535         {
2536                 struct mbuf *m_at;
2537
2538                 m_at = m;
2539                 while (SCTP_BUF_NEXT(m_at) != NULL) {
2540                         m_at = SCTP_BUF_NEXT(m_at);
2541                 }
2542                 SCTP_BUF_NEXT(m_at) = m_sig;
2543         }
2544
2545         if (cookie_ok == 0) {
2546                 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n");
2547                 SCTPDBG(SCTP_DEBUG_INPUT2,
2548                     "offset = %u, cookie_offset = %u, sig_offset = %u\n",
2549                     (uint32_t) offset, cookie_offset, sig_offset);
2550                 return (NULL);
2551         }
2552         /*
2553          * check the cookie timestamps to be sure it's not stale
2554          */
2555         (void)SCTP_GETTIME_TIMEVAL(&now);
2556         /* Expire time is in Ticks, so we convert to seconds */
2557         time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life);
2558         time_expires.tv_usec = cookie->time_entered.tv_usec;
2559         /*
2560          * TODO sctp_constants.h needs alternative time macros when _KERNEL
2561          * is undefined.
2562          */
2563         if (timevalcmp(&now, &time_expires, >)) {
2564                 /* cookie is stale! */
2565                 struct mbuf *op_err;
2566                 struct sctp_stale_cookie_msg *scm;
2567                 uint32_t tim;
2568
2569                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_stale_cookie_msg),
2570                     0, M_DONTWAIT, 1, MT_DATA);
2571                 if (op_err == NULL) {
2572                         /* FOOBAR */
2573                         return (NULL);
2574                 }
2575                 /* Set the len */
2576                 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_stale_cookie_msg);
2577                 scm = mtod(op_err, struct sctp_stale_cookie_msg *);
2578                 scm->ph.param_type = htons(SCTP_CAUSE_STALE_COOKIE);
2579                 scm->ph.param_length = htons((sizeof(struct sctp_paramhdr) +
2580                     (sizeof(uint32_t))));
2581                 /* seconds to usec */
2582                 tim = (now.tv_sec - time_expires.tv_sec) * 1000000;
2583                 /* add in usec */
2584                 if (tim == 0)
2585                         tim = now.tv_usec - cookie->time_entered.tv_usec;
2586                 scm->time_usec = htonl(tim);
2587                 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
2588                     use_mflowid, mflowid,
2589                     vrf_id, port);
2590                 return (NULL);
2591         }
2592         /*
2593          * Now we must see with the lookup address if we have an existing
2594          * asoc. This will only happen if we were in the COOKIE-WAIT state
2595          * and a INIT collided with us and somewhere the peer sent the
2596          * cookie on another address besides the single address our assoc
2597          * had for him. In this case we will have one of the tie-tags set at
2598          * least AND the address field in the cookie can be used to look it
2599          * up.
2600          */
2601         to = NULL;
2602         switch (cookie->addr_type) {
2603 #ifdef INET6
2604         case SCTP_IPV6_ADDRESS:
2605                 memset(&sin6, 0, sizeof(sin6));
2606                 sin6.sin6_family = AF_INET6;
2607                 sin6.sin6_len = sizeof(sin6);
2608                 sin6.sin6_port = sh->src_port;
2609                 sin6.sin6_scope_id = cookie->scope_id;
2610                 memcpy(&sin6.sin6_addr.s6_addr, cookie->address,
2611                     sizeof(sin6.sin6_addr.s6_addr));
2612                 to = (struct sockaddr *)&sin6;
2613                 break;
2614 #endif
2615 #ifdef INET
2616         case SCTP_IPV4_ADDRESS:
2617                 memset(&sin, 0, sizeof(sin));
2618                 sin.sin_family = AF_INET;
2619                 sin.sin_len = sizeof(sin);
2620                 sin.sin_port = sh->src_port;
2621                 sin.sin_addr.s_addr = cookie->address[0];
2622                 to = (struct sockaddr *)&sin;
2623                 break;
2624 #endif
2625         default:
2626                 /* This should not happen */
2627                 return (NULL);
2628         }
2629         if ((*stcb == NULL) && to) {
2630                 /* Yep, lets check */
2631                 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL);
2632                 if (*stcb == NULL) {
2633                         /*
2634                          * We should have only got back the same inp. If we
2635                          * got back a different ep we have a problem. The
2636                          * original findep got back l_inp and now
2637                          */
2638                         if (l_inp != *inp_p) {
2639                                 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n");
2640                         }
2641                 } else {
2642                         if (*locked_tcb == NULL) {
2643                                 /*
2644                                  * In this case we found the assoc only
2645                                  * after we locked the create lock. This
2646                                  * means we are in a colliding case and we
2647                                  * must make sure that we unlock the tcb if
2648                                  * its one of the cases where we throw away
2649                                  * the incoming packets.
2650                                  */
2651                                 *locked_tcb = *stcb;
2652
2653                                 /*
2654                                  * We must also increment the inp ref count
2655                                  * since the ref_count flags was set when we
2656                                  * did not find the TCB, now we found it
2657                                  * which reduces the refcount.. we must
2658                                  * raise it back out to balance it all :-)
2659                                  */
2660                                 SCTP_INP_INCR_REF((*stcb)->sctp_ep);
2661                                 if ((*stcb)->sctp_ep != l_inp) {
2662                                         SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n",
2663                                             (void *)(*stcb)->sctp_ep, (void *)l_inp);
2664                                 }
2665                         }
2666                 }
2667         }
2668         if (to == NULL) {
2669                 return (NULL);
2670         }
2671         cookie_len -= SCTP_SIGNATURE_SIZE;
2672         if (*stcb == NULL) {
2673                 /* this is the "normal" case... get a new TCB */
2674                 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh,
2675                     cookie, cookie_len, *inp_p,
2676                     netp, to, &notification,
2677                     auth_skipped, auth_offset, auth_len,
2678                     use_mflowid, mflowid,
2679                     vrf_id, port);
2680         } else {
2681                 /* this is abnormal... cookie-echo on existing TCB */
2682                 had_a_existing_tcb = 1;
2683                 *stcb = sctp_process_cookie_existing(m, iphlen, offset,
2684                     src, dst, sh,
2685                     cookie, cookie_len, *inp_p, *stcb, netp, to,
2686                     &notification, auth_skipped, auth_offset, auth_len,
2687                     use_mflowid, mflowid,
2688                     vrf_id, port);
2689         }
2690
2691         if (*stcb == NULL) {
2692                 /* still no TCB... must be bad cookie-echo */
2693                 return (NULL);
2694         }
2695         if ((*netp != NULL) && (use_mflowid != 0)) {
2696                 (*netp)->flowid = mflowid;
2697 #ifdef INVARIANTS
2698                 (*netp)->flowidset = 1;
2699 #endif
2700         }
2701         /*
2702          * Ok, we built an association so confirm the address we sent the
2703          * INIT-ACK to.
2704          */
2705         netl = sctp_findnet(*stcb, to);
2706         /*
2707          * This code should in theory NOT run but
2708          */
2709         if (netl == NULL) {
2710                 /* TSNH! Huh, why do I need to add this address here? */
2711                 if (sctp_add_remote_addr(*stcb, to, NULL, SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) {
2712                         return (NULL);
2713                 }
2714                 netl = sctp_findnet(*stcb, to);
2715         }
2716         if (netl) {
2717                 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) {
2718                         netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
2719                         (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL,
2720                             netl);
2721                         send_int_conf = 1;
2722                 }
2723         }
2724         sctp_start_net_timers(*stcb);
2725         if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
2726                 if (!had_a_existing_tcb ||
2727                     (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
2728                         /*
2729                          * If we have a NEW cookie or the connect never
2730                          * reached the connected state during collision we
2731                          * must do the TCP accept thing.
2732                          */
2733                         struct socket *so, *oso;
2734                         struct sctp_inpcb *inp;
2735
2736                         if (notification == SCTP_NOTIFY_ASSOC_RESTART) {
2737                                 /*
2738                                  * For a restart we will keep the same
2739                                  * socket, no need to do anything. I THINK!!
2740                                  */
2741                                 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2742                                 if (send_int_conf) {
2743                                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2744                                             (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2745                                 }
2746                                 return (m);
2747                         }
2748                         oso = (*inp_p)->sctp_socket;
2749                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2750                         SCTP_TCB_UNLOCK((*stcb));
2751                         CURVNET_SET(oso->so_vnet);
2752                         so = sonewconn(oso, 0
2753                             );
2754                         CURVNET_RESTORE();
2755                         SCTP_TCB_LOCK((*stcb));
2756                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2757
2758                         if (so == NULL) {
2759                                 struct mbuf *op_err;
2760
2761 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2762                                 struct socket *pcb_so;
2763
2764 #endif
2765                                 /* Too many sockets */
2766                                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n");
2767                                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC);
2768                                 sctp_abort_association(*inp_p, NULL, m, iphlen,
2769                                     src, dst, sh, op_err,
2770                                     use_mflowid, mflowid,
2771                                     vrf_id, port);
2772 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2773                                 pcb_so = SCTP_INP_SO(*inp_p);
2774                                 atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2775                                 SCTP_TCB_UNLOCK((*stcb));
2776                                 SCTP_SOCKET_LOCK(pcb_so, 1);
2777                                 SCTP_TCB_LOCK((*stcb));
2778                                 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2779 #endif
2780                                 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_20);
2781 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2782                                 SCTP_SOCKET_UNLOCK(pcb_so, 1);
2783 #endif
2784                                 return (NULL);
2785                         }
2786                         inp = (struct sctp_inpcb *)so->so_pcb;
2787                         SCTP_INP_INCR_REF(inp);
2788                         /*
2789                          * We add the unbound flag here so that if we get an
2790                          * soabort() before we get the move_pcb done, we
2791                          * will properly cleanup.
2792                          */
2793                         inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE |
2794                             SCTP_PCB_FLAGS_CONNECTED |
2795                             SCTP_PCB_FLAGS_IN_TCPPOOL |
2796                             SCTP_PCB_FLAGS_UNBOUND |
2797                             (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) |
2798                             SCTP_PCB_FLAGS_DONT_WAKE);
2799                         inp->sctp_features = (*inp_p)->sctp_features;
2800                         inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features;
2801                         inp->sctp_socket = so;
2802                         inp->sctp_frag_point = (*inp_p)->sctp_frag_point;
2803                         inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off;
2804                         inp->sctp_ecn_enable = (*inp_p)->sctp_ecn_enable;
2805                         inp->partial_delivery_point = (*inp_p)->partial_delivery_point;
2806                         inp->sctp_context = (*inp_p)->sctp_context;
2807                         inp->local_strreset_support = (*inp_p)->local_strreset_support;
2808                         inp->inp_starting_point_for_iterator = NULL;
2809                         /*
2810                          * copy in the authentication parameters from the
2811                          * original endpoint
2812                          */
2813                         if (inp->sctp_ep.local_hmacs)
2814                                 sctp_free_hmaclist(inp->sctp_ep.local_hmacs);
2815                         inp->sctp_ep.local_hmacs =
2816                             sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs);
2817                         if (inp->sctp_ep.local_auth_chunks)
2818                                 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks);
2819                         inp->sctp_ep.local_auth_chunks =
2820                             sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks);
2821
2822                         /*
2823                          * Now we must move it from one hash table to
2824                          * another and get the tcb in the right place.
2825                          */
2826
2827                         /*
2828                          * This is where the one-2-one socket is put into
2829                          * the accept state waiting for the accept!
2830                          */
2831                         if (*stcb) {
2832                                 (*stcb)->asoc.state |= SCTP_STATE_IN_ACCEPT_QUEUE;
2833                         }
2834                         sctp_move_pcb_and_assoc(*inp_p, inp, *stcb);
2835
2836                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2837                         SCTP_TCB_UNLOCK((*stcb));
2838
2839                         sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb,
2840                             0);
2841                         SCTP_TCB_LOCK((*stcb));
2842                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2843
2844
2845                         /*
2846                          * now we must check to see if we were aborted while
2847                          * the move was going on and the lock/unlock
2848                          * happened.
2849                          */
2850                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
2851                                 /*
2852                                  * yep it was, we leave the assoc attached
2853                                  * to the socket since the sctp_inpcb_free()
2854                                  * call will send an abort for us.
2855                                  */
2856                                 SCTP_INP_DECR_REF(inp);
2857                                 return (NULL);
2858                         }
2859                         SCTP_INP_DECR_REF(inp);
2860                         /* Switch over to the new guy */
2861                         *inp_p = inp;
2862                         sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2863                         if (send_int_conf) {
2864                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2865                                     (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2866                         }
2867                         /*
2868                          * Pull it from the incomplete queue and wake the
2869                          * guy
2870                          */
2871 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2872                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2873                         SCTP_TCB_UNLOCK((*stcb));
2874                         SCTP_SOCKET_LOCK(so, 1);
2875 #endif
2876                         soisconnected(so);
2877 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2878                         SCTP_TCB_LOCK((*stcb));
2879                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2880                         SCTP_SOCKET_UNLOCK(so, 1);
2881 #endif
2882                         return (m);
2883                 }
2884         }
2885         if (notification) {
2886                 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2887         }
2888         if (send_int_conf) {
2889                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2890                     (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2891         }
2892         return (m);
2893 }
2894
2895 static void
2896 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED,
2897     struct sctp_tcb *stcb, struct sctp_nets *net)
2898 {
2899         /* cp must not be used, others call this without a c-ack :-) */
2900         struct sctp_association *asoc;
2901
2902         SCTPDBG(SCTP_DEBUG_INPUT2,
2903             "sctp_handle_cookie_ack: handling COOKIE-ACK\n");
2904         if (stcb == NULL)
2905                 return;
2906
2907         asoc = &stcb->asoc;
2908
2909         sctp_stop_all_cookie_timers(stcb);
2910         /* process according to association state */
2911         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) {
2912                 /* state change only needed when I am in right state */
2913                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2914                 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
2915                 sctp_start_net_timers(stcb);
2916                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2917                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2918                             stcb->sctp_ep, stcb, asoc->primary_destination);
2919
2920                 }
2921                 /* update RTO */
2922                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
2923                 SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2924                 if (asoc->overall_error_count == 0) {
2925                         net->RTO = sctp_calculate_rto(stcb, asoc, net,
2926                             &asoc->time_entered, sctp_align_safe_nocopy,
2927                             SCTP_RTT_FROM_NON_DATA);
2928                 }
2929                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
2930                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2931                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2932                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
2933 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2934                         struct socket *so;
2935
2936 #endif
2937                         stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2938 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2939                         so = SCTP_INP_SO(stcb->sctp_ep);
2940                         atomic_add_int(&stcb->asoc.refcnt, 1);
2941                         SCTP_TCB_UNLOCK(stcb);
2942                         SCTP_SOCKET_LOCK(so, 1);
2943                         SCTP_TCB_LOCK(stcb);
2944                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
2945 #endif
2946                         if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) {
2947                                 soisconnected(stcb->sctp_socket);
2948                         }
2949 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2950                         SCTP_SOCKET_UNLOCK(so, 1);
2951 #endif
2952                 }
2953                 /*
2954                  * since we did not send a HB make sure we don't double
2955                  * things
2956                  */
2957                 net->hb_responded = 1;
2958
2959                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
2960                         /*
2961                          * We don't need to do the asconf thing, nor hb or
2962                          * autoclose if the socket is closed.
2963                          */
2964                         goto closed_socket;
2965                 }
2966                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
2967                     stcb, net);
2968
2969
2970                 if (stcb->asoc.sctp_autoclose_ticks &&
2971                     sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2972                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
2973                             stcb->sctp_ep, stcb, NULL);
2974                 }
2975                 /*
2976                  * send ASCONF if parameters are pending and ASCONFs are
2977                  * allowed (eg. addresses changed when init/cookie echo were
2978                  * in flight)
2979                  */
2980                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) &&
2981                     (stcb->asoc.peer_supports_asconf) &&
2982                     (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) {
2983 #ifdef SCTP_TIMER_BASED_ASCONF
2984                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF,
2985                             stcb->sctp_ep, stcb,
2986                             stcb->asoc.primary_destination);
2987 #else
2988                         sctp_send_asconf(stcb, stcb->asoc.primary_destination,
2989                             SCTP_ADDR_NOT_LOCKED);
2990 #endif
2991                 }
2992         }
2993 closed_socket:
2994         /* Toss the cookie if I can */
2995         sctp_toss_old_cookies(stcb, asoc);
2996         if (!TAILQ_EMPTY(&asoc->sent_queue)) {
2997                 /* Restart the timer if we have pending data */
2998                 struct sctp_tmit_chunk *chk;
2999
3000                 chk = TAILQ_FIRST(&asoc->sent_queue);
3001                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
3002         }
3003 }
3004
3005 static void
3006 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp,
3007     struct sctp_tcb *stcb)
3008 {
3009         struct sctp_nets *net;
3010         struct sctp_tmit_chunk *lchk;
3011         struct sctp_ecne_chunk bkup;
3012         uint8_t override_bit;
3013         uint32_t tsn, window_data_tsn;
3014         int len;
3015         unsigned int pkt_cnt;
3016
3017         len = ntohs(cp->ch.chunk_length);
3018         if ((len != sizeof(struct sctp_ecne_chunk)) &&
3019             (len != sizeof(struct old_sctp_ecne_chunk))) {
3020                 return;
3021         }
3022         if (len == sizeof(struct old_sctp_ecne_chunk)) {
3023                 /* Its the old format */
3024                 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk));
3025                 bkup.num_pkts_since_cwr = htonl(1);
3026                 cp = &bkup;
3027         }
3028         SCTP_STAT_INCR(sctps_recvecne);
3029         tsn = ntohl(cp->tsn);
3030         pkt_cnt = ntohl(cp->num_pkts_since_cwr);
3031         lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead);
3032         if (lchk == NULL) {
3033                 window_data_tsn = stcb->asoc.sending_seq - 1;
3034         } else {
3035                 window_data_tsn = lchk->rec.data.TSN_seq;
3036         }
3037
3038         /* Find where it was sent to if possible. */
3039         net = NULL;
3040         TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) {
3041                 if (lchk->rec.data.TSN_seq == tsn) {
3042                         net = lchk->whoTo;
3043                         net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send;
3044                         break;
3045                 }
3046                 if (SCTP_TSN_GT(lchk->rec.data.TSN_seq, tsn)) {
3047                         break;
3048                 }
3049         }
3050         if (net == NULL) {
3051                 /*
3052                  * What to do. A previous send of a CWR was possibly lost.
3053                  * See how old it is, we may have it marked on the actual
3054                  * net.
3055                  */
3056                 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
3057                         if (tsn == net->last_cwr_tsn) {
3058                                 /* Found him, send it off */
3059                                 break;
3060                         }
3061                 }
3062                 if (net == NULL) {
3063                         /*
3064                          * If we reach here, we need to send a special CWR
3065                          * that says hey, we did this a long time ago and
3066                          * you lost the response.
3067                          */
3068                         net = TAILQ_FIRST(&stcb->asoc.nets);
3069                         if (net == NULL) {
3070                                 /* TSNH */
3071                                 return;
3072                         }
3073                         override_bit = SCTP_CWR_REDUCE_OVERRIDE;
3074                 } else {
3075                         override_bit = 0;
3076                 }
3077         } else {
3078                 override_bit = 0;
3079         }
3080         if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) &&
3081             ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
3082                 /*
3083                  * JRS - Use the congestion control given in the pluggable
3084                  * CC module
3085                  */
3086                 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt);
3087                 /*
3088                  * We reduce once every RTT. So we will only lower cwnd at
3089                  * the next sending seq i.e. the window_data_tsn
3090                  */
3091                 net->cwr_window_tsn = window_data_tsn;
3092                 net->ecn_ce_pkt_cnt += pkt_cnt;
3093                 net->lost_cnt = pkt_cnt;
3094                 net->last_cwr_tsn = tsn;
3095         } else {
3096                 override_bit |= SCTP_CWR_IN_SAME_WINDOW;
3097                 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) &&
3098                     ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
3099                         /*
3100                          * Another loss in the same window update how many
3101                          * marks/packets lost we have had.
3102                          */
3103                         int cnt = 1;
3104
3105                         if (pkt_cnt > net->lost_cnt) {
3106                                 /* Should be the case */
3107                                 cnt = (pkt_cnt - net->lost_cnt);
3108                                 net->ecn_ce_pkt_cnt += cnt;
3109                         }
3110                         net->lost_cnt = pkt_cnt;
3111                         net->last_cwr_tsn = tsn;
3112                         /*
3113                          * Most CC functions will ignore this call, since we
3114                          * are in-window yet of the initial CE the peer saw.
3115                          */
3116                         stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt);
3117                 }
3118         }
3119         /*
3120          * We always send a CWR this way if our previous one was lost our
3121          * peer will get an update, or if it is not time again to reduce we
3122          * still get the cwr to the peer. Note we set the override when we
3123          * could not find the TSN on the chunk or the destination network.
3124          */
3125         sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit);
3126 }
3127
3128 static void
3129 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net)
3130 {
3131         /*
3132          * Here we get a CWR from the peer. We must look in the outqueue and
3133          * make sure that we have a covered ECNE in the control chunk part.
3134          * If so remove it.
3135          */
3136         struct sctp_tmit_chunk *chk;
3137         struct sctp_ecne_chunk *ecne;
3138         int override;
3139         uint32_t cwr_tsn;
3140
3141         cwr_tsn = ntohl(cp->tsn);
3142
3143         override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE;
3144         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
3145                 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) {
3146                         continue;
3147                 }
3148                 if ((override == 0) && (chk->whoTo != net)) {
3149                         /* Must be from the right src unless override is set */
3150                         continue;
3151                 }
3152                 ecne = mtod(chk->data, struct sctp_ecne_chunk *);
3153                 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) {
3154                         /* this covers this ECNE, we can remove it */
3155                         stcb->asoc.ecn_echo_cnt_onq--;
3156                         TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk,
3157                             sctp_next);
3158                         if (chk->data) {
3159                                 sctp_m_freem(chk->data);
3160                                 chk->data = NULL;
3161                         }
3162                         stcb->asoc.ctrl_queue_cnt--;
3163                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3164                         if (override == 0) {
3165                                 break;
3166                         }
3167                 }
3168         }
3169 }
3170
3171 static void
3172 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED,
3173     struct sctp_tcb *stcb, struct sctp_nets *net)
3174 {
3175         struct sctp_association *asoc;
3176
3177 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3178         struct socket *so;
3179
3180 #endif
3181
3182         SCTPDBG(SCTP_DEBUG_INPUT2,
3183             "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n");
3184         if (stcb == NULL)
3185                 return;
3186
3187         asoc = &stcb->asoc;
3188         /* process according to association state */
3189         if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
3190                 /* unexpected SHUTDOWN-COMPLETE... so ignore... */
3191                 SCTPDBG(SCTP_DEBUG_INPUT2,
3192                     "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n");
3193                 SCTP_TCB_UNLOCK(stcb);
3194                 return;
3195         }
3196         /* notify upper layer protocol */
3197         if (stcb->sctp_socket) {
3198                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
3199                 /* are the queues empty? they should be */
3200                 if (!TAILQ_EMPTY(&asoc->send_queue) ||
3201                     !TAILQ_EMPTY(&asoc->sent_queue) ||
3202                     !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
3203                         sctp_report_all_outbound(stcb, 0, 0, SCTP_SO_NOT_LOCKED);
3204                 }
3205         }
3206         /* stop the timer */
3207         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_22);
3208         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
3209         /* free the TCB */
3210         SCTPDBG(SCTP_DEBUG_INPUT2,
3211             "sctp_handle_shutdown_complete: calls free-asoc\n");
3212 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3213         so = SCTP_INP_SO(stcb->sctp_ep);
3214         atomic_add_int(&stcb->asoc.refcnt, 1);
3215         SCTP_TCB_UNLOCK(stcb);
3216         SCTP_SOCKET_LOCK(so, 1);
3217         SCTP_TCB_LOCK(stcb);
3218         atomic_subtract_int(&stcb->asoc.refcnt, 1);
3219 #endif
3220         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_23);
3221 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3222         SCTP_SOCKET_UNLOCK(so, 1);
3223 #endif
3224         return;
3225 }
3226
3227 static int
3228 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc,
3229     struct sctp_nets *net, uint8_t flg)
3230 {
3231         switch (desc->chunk_type) {
3232         case SCTP_DATA:
3233                 /* find the tsn to resend (possibly */
3234                 {
3235                         uint32_t tsn;
3236                         struct sctp_tmit_chunk *tp1;
3237
3238                         tsn = ntohl(desc->tsn_ifany);
3239                         TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3240                                 if (tp1->rec.data.TSN_seq == tsn) {
3241                                         /* found it */
3242                                         break;
3243                                 }
3244                                 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, tsn)) {
3245                                         /* not found */
3246                                         tp1 = NULL;
3247                                         break;
3248                                 }
3249                         }
3250                         if (tp1 == NULL) {
3251                                 /*
3252                                  * Do it the other way , aka without paying
3253                                  * attention to queue seq order.
3254                                  */
3255                                 SCTP_STAT_INCR(sctps_pdrpdnfnd);
3256                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3257                                         if (tp1->rec.data.TSN_seq == tsn) {
3258                                                 /* found it */
3259                                                 break;
3260                                         }
3261                                 }
3262                         }
3263                         if (tp1 == NULL) {
3264                                 SCTP_STAT_INCR(sctps_pdrptsnnf);
3265                         }
3266                         if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) {
3267                                 uint8_t *ddp;
3268
3269                                 if (((flg & SCTP_BADCRC) == 0) &&
3270                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3271                                         return (0);
3272                                 }
3273                                 if ((stcb->asoc.peers_rwnd == 0) &&
3274                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3275                                         SCTP_STAT_INCR(sctps_pdrpdiwnp);
3276                                         return (0);
3277                                 }
3278                                 if (stcb->asoc.peers_rwnd == 0 &&
3279                                     (flg & SCTP_FROM_MIDDLE_BOX)) {
3280                                         SCTP_STAT_INCR(sctps_pdrpdizrw);
3281                                         return (0);
3282                                 }
3283                                 ddp = (uint8_t *) (mtod(tp1->data, caddr_t)+
3284                                     sizeof(struct sctp_data_chunk));
3285                                 {
3286                                         unsigned int iii;
3287
3288                                         for (iii = 0; iii < sizeof(desc->data_bytes);
3289                                             iii++) {
3290                                                 if (ddp[iii] != desc->data_bytes[iii]) {
3291                                                         SCTP_STAT_INCR(sctps_pdrpbadd);
3292                                                         return (-1);
3293                                                 }
3294                                         }
3295                                 }
3296
3297                                 if (tp1->do_rtt) {
3298                                         /*
3299                                          * this guy had a RTO calculation
3300                                          * pending on it, cancel it
3301                                          */
3302                                         if (tp1->whoTo->rto_needed == 0) {
3303                                                 tp1->whoTo->rto_needed = 1;
3304                                         }
3305                                         tp1->do_rtt = 0;
3306                                 }
3307                                 SCTP_STAT_INCR(sctps_pdrpmark);
3308                                 if (tp1->sent != SCTP_DATAGRAM_RESEND)
3309                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3310                                 /*
3311                                  * mark it as if we were doing a FR, since
3312                                  * we will be getting gap ack reports behind
3313                                  * the info from the router.
3314                                  */
3315                                 tp1->rec.data.doing_fast_retransmit = 1;
3316                                 /*
3317                                  * mark the tsn with what sequences can
3318                                  * cause a new FR.
3319                                  */
3320                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) {
3321                                         tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
3322                                 } else {
3323                                         tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq;
3324                                 }
3325
3326                                 /* restart the timer */
3327                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3328                                     stcb, tp1->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_24);
3329                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3330                                     stcb, tp1->whoTo);
3331
3332                                 /* fix counts and things */
3333                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
3334                                         sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP,
3335                                             tp1->whoTo->flight_size,
3336                                             tp1->book_size,
3337                                             (uintptr_t) stcb,
3338                                             tp1->rec.data.TSN_seq);
3339                                 }
3340                                 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
3341                                         sctp_flight_size_decrease(tp1);
3342                                         sctp_total_flight_decrease(stcb, tp1);
3343                                 }
3344                                 tp1->sent = SCTP_DATAGRAM_RESEND;
3345                         } {
3346                                 /* audit code */
3347                                 unsigned int audit;
3348
3349                                 audit = 0;
3350                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3351                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3352                                                 audit++;
3353                                 }
3354                                 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue,
3355                                     sctp_next) {
3356                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3357                                                 audit++;
3358                                 }
3359                                 if (audit != stcb->asoc.sent_queue_retran_cnt) {
3360                                         SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n",
3361                                             audit, stcb->asoc.sent_queue_retran_cnt);
3362 #ifndef SCTP_AUDITING_ENABLED
3363                                         stcb->asoc.sent_queue_retran_cnt = audit;
3364 #endif
3365                                 }
3366                         }
3367                 }
3368                 break;
3369         case SCTP_ASCONF:
3370                 {
3371                         struct sctp_tmit_chunk *asconf;
3372
3373                         TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue,
3374                             sctp_next) {
3375                                 if (asconf->rec.chunk_id.id == SCTP_ASCONF) {
3376                                         break;
3377                                 }
3378                         }
3379                         if (asconf) {
3380                                 if (asconf->sent != SCTP_DATAGRAM_RESEND)
3381                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3382                                 asconf->sent = SCTP_DATAGRAM_RESEND;
3383                                 asconf->snd_count--;
3384                         }
3385                 }
3386                 break;
3387         case SCTP_INITIATION:
3388                 /* resend the INIT */
3389                 stcb->asoc.dropped_special_cnt++;
3390                 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) {
3391                         /*
3392                          * If we can get it in, in a few attempts we do
3393                          * this, otherwise we let the timer fire.
3394                          */
3395                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep,
3396                             stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_25);
3397                         sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
3398                 }
3399                 break;
3400         case SCTP_SELECTIVE_ACK:
3401         case SCTP_NR_SELECTIVE_ACK:
3402                 /* resend the sack */
3403                 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED);
3404                 break;
3405         case SCTP_HEARTBEAT_REQUEST:
3406                 /* resend a demand HB */
3407                 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) {
3408                         /*
3409                          * Only retransmit if we KNOW we wont destroy the
3410                          * tcb
3411                          */
3412                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
3413                 }
3414                 break;
3415         case SCTP_SHUTDOWN:
3416                 sctp_send_shutdown(stcb, net);
3417                 break;
3418         case SCTP_SHUTDOWN_ACK:
3419                 sctp_send_shutdown_ack(stcb, net);
3420                 break;
3421         case SCTP_COOKIE_ECHO:
3422                 {
3423                         struct sctp_tmit_chunk *cookie;
3424
3425                         cookie = NULL;
3426                         TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue,
3427                             sctp_next) {
3428                                 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
3429                                         break;
3430                                 }
3431                         }
3432                         if (cookie) {
3433                                 if (cookie->sent != SCTP_DATAGRAM_RESEND)
3434                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3435                                 cookie->sent = SCTP_DATAGRAM_RESEND;
3436                                 sctp_stop_all_cookie_timers(stcb);
3437                         }
3438                 }
3439                 break;
3440         case SCTP_COOKIE_ACK:
3441                 sctp_send_cookie_ack(stcb);
3442                 break;
3443         case SCTP_ASCONF_ACK:
3444                 /* resend last asconf ack */
3445                 sctp_send_asconf_ack(stcb);
3446                 break;
3447         case SCTP_FORWARD_CUM_TSN:
3448                 send_forward_tsn(stcb, &stcb->asoc);
3449                 break;
3450                 /* can't do anything with these */
3451         case SCTP_PACKET_DROPPED:
3452         case SCTP_INITIATION_ACK:       /* this should not happen */
3453         case SCTP_HEARTBEAT_ACK:
3454         case SCTP_ABORT_ASSOCIATION:
3455         case SCTP_OPERATION_ERROR:
3456         case SCTP_SHUTDOWN_COMPLETE:
3457         case SCTP_ECN_ECHO:
3458         case SCTP_ECN_CWR:
3459         default:
3460                 break;
3461         }
3462         return (0);
3463 }
3464
3465 void
3466 sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list)
3467 {
3468         uint32_t i;
3469         uint16_t temp;
3470
3471         /*
3472          * We set things to 0xffff since this is the last delivered sequence
3473          * and we will be sending in 0 after the reset.
3474          */
3475
3476         if (number_entries) {
3477                 for (i = 0; i < number_entries; i++) {
3478                         temp = ntohs(list[i]);
3479                         if (temp >= stcb->asoc.streamincnt) {
3480                                 continue;
3481                         }
3482                         stcb->asoc.strmin[temp].last_sequence_delivered = 0xffff;
3483                 }
3484         } else {
3485                 list = NULL;
3486                 for (i = 0; i < stcb->asoc.streamincnt; i++) {
3487                         stcb->asoc.strmin[i].last_sequence_delivered = 0xffff;
3488                 }
3489         }
3490         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3491 }
3492
3493 static void
3494 sctp_reset_out_streams(struct sctp_tcb *stcb, int number_entries, uint16_t * list)
3495 {
3496         int i;
3497
3498         if (number_entries == 0) {
3499                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3500                         stcb->asoc.strmout[i].next_sequence_send = 0;
3501                 }
3502         } else if (number_entries) {
3503                 for (i = 0; i < number_entries; i++) {
3504                         uint16_t temp;
3505
3506                         temp = ntohs(list[i]);
3507                         if (temp >= stcb->asoc.streamoutcnt) {
3508                                 /* no such stream */
3509                                 continue;
3510                         }
3511                         stcb->asoc.strmout[temp].next_sequence_send = 0;
3512                 }
3513         }
3514         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3515 }
3516
3517
3518 struct sctp_stream_reset_out_request *
3519 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk)
3520 {
3521         struct sctp_association *asoc;
3522         struct sctp_chunkhdr *ch;
3523         struct sctp_stream_reset_out_request *r;
3524         struct sctp_tmit_chunk *chk;
3525         int len, clen;
3526
3527         asoc = &stcb->asoc;
3528         if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
3529                 asoc->stream_reset_outstanding = 0;
3530                 return (NULL);
3531         }
3532         if (stcb->asoc.str_reset == NULL) {
3533                 asoc->stream_reset_outstanding = 0;
3534                 return (NULL);
3535         }
3536         chk = stcb->asoc.str_reset;
3537         if (chk->data == NULL) {
3538                 return (NULL);
3539         }
3540         if (bchk) {
3541                 /* he wants a copy of the chk pointer */
3542                 *bchk = chk;
3543         }
3544         clen = chk->send_size;
3545         ch = mtod(chk->data, struct sctp_chunkhdr *);
3546         r = (struct sctp_stream_reset_out_request *)(ch + 1);
3547         if (ntohl(r->request_seq) == seq) {
3548                 /* found it */
3549                 return (r);
3550         }
3551         len = SCTP_SIZE32(ntohs(r->ph.param_length));
3552         if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) {
3553                 /* move to the next one, there can only be a max of two */
3554                 r = (struct sctp_stream_reset_out_request *)((caddr_t)r + len);
3555                 if (ntohl(r->request_seq) == seq) {
3556                         return (r);
3557                 }
3558         }
3559         /* that seq is not here */
3560         return (NULL);
3561 }
3562
3563 static void
3564 sctp_clean_up_stream_reset(struct sctp_tcb *stcb)
3565 {
3566         struct sctp_association *asoc;
3567         struct sctp_tmit_chunk *chk = stcb->asoc.str_reset;
3568
3569         if (stcb->asoc.str_reset == NULL) {
3570                 return;
3571         }
3572         asoc = &stcb->asoc;
3573
3574         sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_26);
3575         TAILQ_REMOVE(&asoc->control_send_queue,
3576             chk,
3577             sctp_next);
3578         if (chk->data) {
3579                 sctp_m_freem(chk->data);
3580                 chk->data = NULL;
3581         }
3582         asoc->ctrl_queue_cnt--;
3583         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3584         /* sa_ignore NO_NULL_CHK */
3585         stcb->asoc.str_reset = NULL;
3586 }
3587
3588
3589 static int
3590 sctp_handle_stream_reset_response(struct sctp_tcb *stcb,
3591     uint32_t seq, uint32_t action,
3592     struct sctp_stream_reset_response *respin)
3593 {
3594         uint16_t type;
3595         int lparm_len;
3596         struct sctp_association *asoc = &stcb->asoc;
3597         struct sctp_tmit_chunk *chk;
3598         struct sctp_stream_reset_out_request *srparam;
3599         int number_entries;
3600
3601         if (asoc->stream_reset_outstanding == 0) {
3602                 /* duplicate */
3603                 return (0);
3604         }
3605         if (seq == stcb->asoc.str_reset_seq_out) {
3606                 srparam = sctp_find_stream_reset(stcb, seq, &chk);
3607                 if (srparam) {
3608                         stcb->asoc.str_reset_seq_out++;
3609                         type = ntohs(srparam->ph.param_type);
3610                         lparm_len = ntohs(srparam->ph.param_length);
3611                         if (type == SCTP_STR_RESET_OUT_REQUEST) {
3612                                 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t);
3613                                 asoc->stream_reset_out_is_outstanding = 0;
3614                                 if (asoc->stream_reset_outstanding)
3615                                         asoc->stream_reset_outstanding--;
3616                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3617                                         /* do it */
3618                                         sctp_reset_out_streams(stcb, number_entries, srparam->list_of_streams);
3619                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3620                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED);
3621                                 } else {
3622                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED);
3623                                 }
3624                         } else if (type == SCTP_STR_RESET_IN_REQUEST) {
3625                                 /* Answered my request */
3626                                 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t);
3627                                 if (asoc->stream_reset_outstanding)
3628                                         asoc->stream_reset_outstanding--;
3629                                 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3630                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb,
3631                                             number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED);
3632                                 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3633                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb,
3634                                             number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED);
3635                                 }
3636                         } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) {
3637                                 /* Ok we now may have more streams */
3638                                 int num_stream;
3639
3640                                 num_stream = stcb->asoc.strm_pending_add_size;
3641                                 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) {
3642                                         /* TSNH */
3643                                         num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt;
3644                                 }
3645                                 stcb->asoc.strm_pending_add_size = 0;
3646                                 if (asoc->stream_reset_outstanding)
3647                                         asoc->stream_reset_outstanding--;
3648                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3649                                         /* Put the new streams into effect */
3650                                         stcb->asoc.streamoutcnt += num_stream;
3651                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
3652                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3653                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3654                                             SCTP_STREAM_CHANGE_DENIED);
3655                                 } else {
3656                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3657                                             SCTP_STREAM_CHANGE_FAILED);
3658                                 }
3659                         } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) {
3660                                 if (asoc->stream_reset_outstanding)
3661                                         asoc->stream_reset_outstanding--;
3662                                 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3663                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3664                                             SCTP_STREAM_CHANGE_DENIED);
3665                                 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3666                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3667                                             SCTP_STREAM_CHANGE_FAILED);
3668                                 }
3669                         } else if (type == SCTP_STR_RESET_TSN_REQUEST) {
3670                                 /**
3671                                  * a) Adopt the new in tsn.
3672                                  * b) reset the map
3673                                  * c) Adopt the new out-tsn
3674                                  */
3675                                 struct sctp_stream_reset_response_tsn *resp;
3676                                 struct sctp_forward_tsn_chunk fwdtsn;
3677                                 int abort_flag = 0;
3678
3679                                 if (respin == NULL) {
3680                                         /* huh ? */
3681                                         return (0);
3682                                 }
3683                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3684                                         resp = (struct sctp_stream_reset_response_tsn *)respin;
3685                                         asoc->stream_reset_outstanding--;
3686                                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3687                                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3688                                         fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1);
3689                                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3690                                         if (abort_flag) {
3691                                                 return (1);
3692                                         }
3693                                         stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1);
3694                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3695                                                 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3696                                         }
3697                                         stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map;
3698                                         stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn);
3699                                         memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size);
3700
3701                                         stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map;
3702                                         memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size);
3703
3704                                         stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn);
3705                                         stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn;
3706
3707                                         sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL);
3708                                         sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL);
3709                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0);
3710                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3711                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
3712                                             SCTP_ASSOC_RESET_DENIED);
3713                                 } else {
3714                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
3715                                             SCTP_ASSOC_RESET_FAILED);
3716                                 }
3717                         }
3718                         /* get rid of the request and get the request flags */
3719                         if (asoc->stream_reset_outstanding == 0) {
3720                                 sctp_clean_up_stream_reset(stcb);
3721                         }
3722                 }
3723         }
3724         return (0);
3725 }
3726
3727 static void
3728 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb,
3729     struct sctp_tmit_chunk *chk,
3730     struct sctp_stream_reset_in_request *req, int trunc)
3731 {
3732         uint32_t seq;
3733         int len, i;
3734         int number_entries;
3735         uint16_t temp;
3736
3737         /*
3738          * peer wants me to send a str-reset to him for my outgoing seq's if
3739          * seq_in is right.
3740          */
3741         struct sctp_association *asoc = &stcb->asoc;
3742
3743         seq = ntohl(req->request_seq);
3744         if (asoc->str_reset_seq_in == seq) {
3745                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3746                 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
3747                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3748                 } else if (trunc) {
3749                         /* Can't do it, since they exceeded our buffer size  */
3750                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3751                 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) {
3752                         len = ntohs(req->ph.param_length);
3753                         number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t));
3754                         for (i = 0; i < number_entries; i++) {
3755                                 temp = ntohs(req->list_of_streams[i]);
3756                                 req->list_of_streams[i] = temp;
3757                         }
3758                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3759                         sctp_add_stream_reset_out(chk, number_entries, req->list_of_streams,
3760                             asoc->str_reset_seq_out,
3761                             seq, (asoc->sending_seq - 1));
3762                         asoc->stream_reset_out_is_outstanding = 1;
3763                         asoc->str_reset = chk;
3764                         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
3765                         stcb->asoc.stream_reset_outstanding++;
3766                 } else {
3767                         /* Can't do it, since we have sent one out */
3768                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
3769                 }
3770                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3771                 asoc->str_reset_seq_in++;
3772         } else if (asoc->str_reset_seq_in - 1 == seq) {
3773                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3774         } else if (asoc->str_reset_seq_in - 2 == seq) {
3775                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3776         } else {
3777                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3778         }
3779 }
3780
3781 static int
3782 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb,
3783     struct sctp_tmit_chunk *chk,
3784     struct sctp_stream_reset_tsn_request *req)
3785 {
3786         /* reset all in and out and update the tsn */
3787         /*
3788          * A) reset my str-seq's on in and out. B) Select a receive next,
3789          * and set cum-ack to it. Also process this selected number as a
3790          * fwd-tsn as well. C) set in the response my next sending seq.
3791          */
3792         struct sctp_forward_tsn_chunk fwdtsn;
3793         struct sctp_association *asoc = &stcb->asoc;
3794         int abort_flag = 0;
3795         uint32_t seq;
3796
3797         seq = ntohl(req->request_seq);
3798         if (asoc->str_reset_seq_in == seq) {
3799                 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0];
3800                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
3801                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3802                 } else {
3803                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3804                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3805                         fwdtsn.ch.chunk_flags = 0;
3806                         fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1);
3807                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3808                         if (abort_flag) {
3809                                 return (1);
3810                         }
3811                         asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA;
3812                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3813                                 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3814                         }
3815                         asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map;
3816                         asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1;
3817                         memset(asoc->mapping_array, 0, asoc->mapping_array_size);
3818                         asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
3819                         memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size);
3820                         atomic_add_int(&asoc->sending_seq, 1);
3821                         /* save off historical data for retrans */
3822                         asoc->last_sending_seq[1] = asoc->last_sending_seq[0];
3823                         asoc->last_sending_seq[0] = asoc->sending_seq;
3824                         asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0];
3825                         asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn;
3826                         sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL);
3827                         sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL);
3828                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3829                         sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0);
3830                 }
3831                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3832                     asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
3833                 asoc->str_reset_seq_in++;
3834         } else if (asoc->str_reset_seq_in - 1 == seq) {
3835                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3836                     asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
3837         } else if (asoc->str_reset_seq_in - 2 == seq) {
3838                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1],
3839                     asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]);
3840         } else {
3841                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3842         }
3843         return (0);
3844 }
3845
3846 static void
3847 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb,
3848     struct sctp_tmit_chunk *chk,
3849     struct sctp_stream_reset_out_request *req, int trunc)
3850 {
3851         uint32_t seq, tsn;
3852         int number_entries, len;
3853         struct sctp_association *asoc = &stcb->asoc;
3854
3855         seq = ntohl(req->request_seq);
3856
3857         /* now if its not a duplicate we process it */
3858         if (asoc->str_reset_seq_in == seq) {
3859                 len = ntohs(req->ph.param_length);
3860                 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t));
3861                 /*
3862                  * the sender is resetting, handle the list issue.. we must
3863                  * a) verify if we can do the reset, if so no problem b) If
3864                  * we can't do the reset we must copy the request. c) queue
3865                  * it, and setup the data in processor to trigger it off
3866                  * when needed and dequeue all the queued data.
3867                  */
3868                 tsn = ntohl(req->send_reset_at_tsn);
3869
3870                 /* move the reset action back one */
3871                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3872                 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
3873                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3874                 } else if (trunc) {
3875                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3876                 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) {
3877                         /* we can do it now */
3878                         sctp_reset_in_stream(stcb, number_entries, req->list_of_streams);
3879                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3880                 } else {
3881                         /*
3882                          * we must queue it up and thus wait for the TSN's
3883                          * to arrive that are at or before tsn
3884                          */
3885                         struct sctp_stream_reset_list *liste;
3886                         int siz;
3887
3888                         siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t));
3889                         SCTP_MALLOC(liste, struct sctp_stream_reset_list *,
3890                             siz, SCTP_M_STRESET);
3891                         if (liste == NULL) {
3892                                 /* gak out of memory */
3893                                 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3894                                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3895                                 return;
3896                         }
3897                         liste->tsn = tsn;
3898                         liste->number_entries = number_entries;
3899                         memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t));
3900                         TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp);
3901                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3902                 }
3903                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3904                 asoc->str_reset_seq_in++;
3905         } else if ((asoc->str_reset_seq_in - 1) == seq) {
3906                 /*
3907                  * one seq back, just echo back last action since my
3908                  * response was lost.
3909                  */
3910                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3911         } else if ((asoc->str_reset_seq_in - 2) == seq) {
3912                 /*
3913                  * two seq back, just echo back last action since my
3914                  * response was lost.
3915                  */
3916                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3917         } else {
3918                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3919         }
3920 }
3921
3922 static void
3923 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
3924     struct sctp_stream_reset_add_strm *str_add)
3925 {
3926         /*
3927          * Peer is requesting to add more streams. If its within our
3928          * max-streams we will allow it.
3929          */
3930         uint32_t num_stream, i;
3931         uint32_t seq;
3932         struct sctp_association *asoc = &stcb->asoc;
3933         struct sctp_queued_to_read *ctl, *nctl;
3934
3935         /* Get the number. */
3936         seq = ntohl(str_add->request_seq);
3937         num_stream = ntohs(str_add->number_of_streams);
3938         /* Now what would be the new total? */
3939         if (asoc->str_reset_seq_in == seq) {
3940                 num_stream += stcb->asoc.streamincnt;
3941                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
3942                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
3943                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3944                 } else if ((num_stream > stcb->asoc.max_inbound_streams) ||
3945                     (num_stream > 0xffff)) {
3946                         /* We must reject it they ask for to many */
3947         denied:
3948                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3949                 } else {
3950                         /* Ok, we can do that :-) */
3951                         struct sctp_stream_in *oldstrm;
3952
3953                         /* save off the old */
3954                         oldstrm = stcb->asoc.strmin;
3955                         SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *,
3956                             (num_stream * sizeof(struct sctp_stream_in)),
3957                             SCTP_M_STRMI);
3958                         if (stcb->asoc.strmin == NULL) {
3959                                 stcb->asoc.strmin = oldstrm;
3960                                 goto denied;
3961                         }
3962                         /* copy off the old data */
3963                         for (i = 0; i < stcb->asoc.streamincnt; i++) {
3964                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
3965                                 stcb->asoc.strmin[i].stream_no = i;
3966                                 stcb->asoc.strmin[i].last_sequence_delivered = oldstrm[i].last_sequence_delivered;
3967                                 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started;
3968                                 /* now anything on those queues? */
3969                                 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next, nctl) {
3970                                         TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next);
3971                                         TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next);
3972                                 }
3973                         }
3974                         /* Init the new streams */
3975                         for (i = stcb->asoc.streamincnt; i < num_stream; i++) {
3976                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
3977                                 stcb->asoc.strmin[i].stream_no = i;
3978                                 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff;
3979                                 stcb->asoc.strmin[i].delivery_started = 0;
3980                         }
3981                         SCTP_FREE(oldstrm, SCTP_M_STRMI);
3982                         /* update the size */
3983                         stcb->asoc.streamincnt = num_stream;
3984                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3985                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
3986                 }
3987                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3988                 asoc->str_reset_seq_in++;
3989         } else if ((asoc->str_reset_seq_in - 1) == seq) {
3990                 /*
3991                  * one seq back, just echo back last action since my
3992                  * response was lost.
3993                  */
3994                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3995         } else if ((asoc->str_reset_seq_in - 2) == seq) {
3996                 /*
3997                  * two seq back, just echo back last action since my
3998                  * response was lost.
3999                  */
4000                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
4001         } else {
4002                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
4003
4004         }
4005 }
4006
4007 static void
4008 sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
4009     struct sctp_stream_reset_add_strm *str_add)
4010 {
4011         /*
4012          * Peer is requesting to add more streams. If its within our
4013          * max-streams we will allow it.
4014          */
4015         uint16_t num_stream;
4016         uint32_t seq;
4017         struct sctp_association *asoc = &stcb->asoc;
4018
4019         /* Get the number. */
4020         seq = ntohl(str_add->request_seq);
4021         num_stream = ntohs(str_add->number_of_streams);
4022         /* Now what would be the new total? */
4023         if (asoc->str_reset_seq_in == seq) {
4024                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
4025                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
4026                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4027                 } else if (stcb->asoc.stream_reset_outstanding) {
4028                         /* We must reject it we have something pending */
4029                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
4030                 } else {
4031                         /* Ok, we can do that :-) */
4032                         int mychk;
4033
4034                         mychk = stcb->asoc.streamoutcnt;
4035                         mychk += num_stream;
4036                         if (mychk < 0x10000) {
4037                                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
4038                                 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 0, 1, num_stream, 0, 1)) {
4039                                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4040                                 }
4041                         } else {
4042                                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4043                         }
4044                 }
4045                 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]);
4046                 asoc->str_reset_seq_in++;
4047         } else if ((asoc->str_reset_seq_in - 1) == seq) {
4048                 /*
4049                  * one seq back, just echo back last action since my
4050                  * response was lost.
4051                  */
4052                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4053         } else if ((asoc->str_reset_seq_in - 2) == seq) {
4054                 /*
4055                  * two seq back, just echo back last action since my
4056                  * response was lost.
4057                  */
4058                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
4059         } else {
4060                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
4061         }
4062 }
4063
4064 #ifdef __GNUC__
4065 __attribute__((noinline))
4066 #endif
4067         static int
4068             sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset,
4069         struct sctp_chunkhdr *ch_req)
4070 {
4071         int chk_length, param_len, ptype;
4072         struct sctp_paramhdr pstore;
4073         uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE];
4074         uint32_t seq = 0;
4075         int num_req = 0;
4076         int trunc = 0;
4077         struct sctp_tmit_chunk *chk;
4078         struct sctp_chunkhdr *ch;
4079         struct sctp_paramhdr *ph;
4080         int ret_code = 0;
4081         int num_param = 0;
4082
4083         /* now it may be a reset or a reset-response */
4084         chk_length = ntohs(ch_req->chunk_length);
4085
4086         /* setup for adding the response */
4087         sctp_alloc_a_chunk(stcb, chk);
4088         if (chk == NULL) {
4089                 return (ret_code);
4090         }
4091         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
4092         chk->rec.chunk_id.can_take_data = 0;
4093         chk->asoc = &stcb->asoc;
4094         chk->no_fr_allowed = 0;
4095         chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr);
4096         chk->book_size_scale = 0;
4097         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
4098         if (chk->data == NULL) {
4099 strres_nochunk:
4100                 if (chk->data) {
4101                         sctp_m_freem(chk->data);
4102                         chk->data = NULL;
4103                 }
4104                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
4105                 return (ret_code);
4106         }
4107         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
4108
4109         /* setup chunk parameters */
4110         chk->sent = SCTP_DATAGRAM_UNSENT;
4111         chk->snd_count = 0;
4112         chk->whoTo = NULL;
4113
4114         ch = mtod(chk->data, struct sctp_chunkhdr *);
4115         ch->chunk_type = SCTP_STREAM_RESET;
4116         ch->chunk_flags = 0;
4117         ch->chunk_length = htons(chk->send_size);
4118         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
4119         offset += sizeof(struct sctp_chunkhdr);
4120         while ((size_t)chk_length >= sizeof(struct sctp_stream_reset_tsn_request)) {
4121                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *) & pstore);
4122                 if (ph == NULL)
4123                         break;
4124                 param_len = ntohs(ph->param_length);
4125                 if (param_len < (int)sizeof(struct sctp_stream_reset_tsn_request)) {
4126                         /* bad param */
4127                         break;
4128                 }
4129                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, (int)sizeof(cstore)),
4130                     (uint8_t *) & cstore);
4131                 ptype = ntohs(ph->param_type);
4132                 num_param++;
4133                 if (param_len > (int)sizeof(cstore)) {
4134                         trunc = 1;
4135                 } else {
4136                         trunc = 0;
4137                 }
4138                 if (num_param > SCTP_MAX_RESET_PARAMS) {
4139                         /* hit the max of parameters already sorry.. */
4140                         break;
4141                 }
4142                 if (ptype == SCTP_STR_RESET_OUT_REQUEST) {
4143                         struct sctp_stream_reset_out_request *req_out;
4144
4145                         req_out = (struct sctp_stream_reset_out_request *)ph;
4146                         num_req++;
4147                         if (stcb->asoc.stream_reset_outstanding) {
4148                                 seq = ntohl(req_out->response_seq);
4149                                 if (seq == stcb->asoc.str_reset_seq_out) {
4150                                         /* implicit ack */
4151                                         (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL);
4152                                 }
4153                         }
4154                         sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc);
4155                 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) {
4156                         struct sctp_stream_reset_add_strm *str_add;
4157
4158                         str_add = (struct sctp_stream_reset_add_strm *)ph;
4159                         num_req++;
4160                         sctp_handle_str_reset_add_strm(stcb, chk, str_add);
4161                 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) {
4162                         struct sctp_stream_reset_add_strm *str_add;
4163
4164                         str_add = (struct sctp_stream_reset_add_strm *)ph;
4165                         num_req++;
4166                         sctp_handle_str_reset_add_out_strm(stcb, chk, str_add);
4167                 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) {
4168                         struct sctp_stream_reset_in_request *req_in;
4169
4170                         num_req++;
4171                         req_in = (struct sctp_stream_reset_in_request *)ph;
4172                         sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc);
4173                 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) {
4174                         struct sctp_stream_reset_tsn_request *req_tsn;
4175
4176                         num_req++;
4177                         req_tsn = (struct sctp_stream_reset_tsn_request *)ph;
4178                         if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) {
4179                                 ret_code = 1;
4180                                 goto strres_nochunk;
4181                         }
4182                         /* no more */
4183                         break;
4184                 } else if (ptype == SCTP_STR_RESET_RESPONSE) {
4185                         struct sctp_stream_reset_response *resp;
4186                         uint32_t result;
4187
4188                         resp = (struct sctp_stream_reset_response *)ph;
4189                         seq = ntohl(resp->response_seq);
4190                         result = ntohl(resp->result);
4191                         if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) {
4192                                 ret_code = 1;
4193                                 goto strres_nochunk;
4194                         }
4195                 } else {
4196                         break;
4197                 }
4198                 offset += SCTP_SIZE32(param_len);
4199                 chk_length -= SCTP_SIZE32(param_len);
4200         }
4201         if (num_req == 0) {
4202                 /* we have no response free the stuff */
4203                 goto strres_nochunk;
4204         }
4205         /* ok we have a chunk to link in */
4206         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue,
4207             chk,
4208             sctp_next);
4209         stcb->asoc.ctrl_queue_cnt++;
4210         return (ret_code);
4211 }
4212
4213 /*
4214  * Handle a router or endpoints report of a packet loss, there are two ways
4215  * to handle this, either we get the whole packet and must disect it
4216  * ourselves (possibly with truncation and or corruption) or it is a summary
4217  * from a middle box that did the disectting for us.
4218  */
4219 static void
4220 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp,
4221     struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit)
4222 {
4223         uint32_t bottle_bw, on_queue;
4224         uint16_t trunc_len;
4225         unsigned int chlen;
4226         unsigned int at;
4227         struct sctp_chunk_desc desc;
4228         struct sctp_chunkhdr *ch;
4229
4230         chlen = ntohs(cp->ch.chunk_length);
4231         chlen -= sizeof(struct sctp_pktdrop_chunk);
4232         /* XXX possible chlen underflow */
4233         if (chlen == 0) {
4234                 ch = NULL;
4235                 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)
4236                         SCTP_STAT_INCR(sctps_pdrpbwrpt);
4237         } else {
4238                 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr));
4239                 chlen -= sizeof(struct sctphdr);
4240                 /* XXX possible chlen underflow */
4241                 memset(&desc, 0, sizeof(desc));
4242         }
4243         trunc_len = (uint16_t) ntohs(cp->trunc_len);
4244         if (trunc_len > limit) {
4245                 trunc_len = limit;
4246         }
4247         /* now the chunks themselves */
4248         while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) {
4249                 desc.chunk_type = ch->chunk_type;
4250                 /* get amount we need to move */
4251                 at = ntohs(ch->chunk_length);
4252                 if (at < sizeof(struct sctp_chunkhdr)) {
4253                         /* corrupt chunk, maybe at the end? */
4254                         SCTP_STAT_INCR(sctps_pdrpcrupt);
4255                         break;
4256                 }
4257                 if (trunc_len == 0) {
4258                         /* we are supposed to have all of it */
4259                         if (at > chlen) {
4260                                 /* corrupt skip it */
4261                                 SCTP_STAT_INCR(sctps_pdrpcrupt);
4262                                 break;
4263                         }
4264                 } else {
4265                         /* is there enough of it left ? */
4266                         if (desc.chunk_type == SCTP_DATA) {
4267                                 if (chlen < (sizeof(struct sctp_data_chunk) +
4268                                     sizeof(desc.data_bytes))) {
4269                                         break;
4270                                 }
4271                         } else {
4272                                 if (chlen < sizeof(struct sctp_chunkhdr)) {
4273                                         break;
4274                                 }
4275                         }
4276                 }
4277                 if (desc.chunk_type == SCTP_DATA) {
4278                         /* can we get out the tsn? */
4279                         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
4280                                 SCTP_STAT_INCR(sctps_pdrpmbda);
4281
4282                         if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) {
4283                                 /* yep */
4284                                 struct sctp_data_chunk *dcp;
4285                                 uint8_t *ddp;
4286                                 unsigned int iii;
4287
4288                                 dcp = (struct sctp_data_chunk *)ch;
4289                                 ddp = (uint8_t *) (dcp + 1);
4290                                 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) {
4291                                         desc.data_bytes[iii] = ddp[iii];
4292                                 }
4293                                 desc.tsn_ifany = dcp->dp.tsn;
4294                         } else {
4295                                 /* nope we are done. */
4296                                 SCTP_STAT_INCR(sctps_pdrpnedat);
4297                                 break;
4298                         }
4299                 } else {
4300                         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
4301                                 SCTP_STAT_INCR(sctps_pdrpmbct);
4302                 }
4303
4304                 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) {
4305                         SCTP_STAT_INCR(sctps_pdrppdbrk);
4306                         break;
4307                 }
4308                 if (SCTP_SIZE32(at) > chlen) {
4309                         break;
4310                 }
4311                 chlen -= SCTP_SIZE32(at);
4312                 if (chlen < sizeof(struct sctp_chunkhdr)) {
4313                         /* done, none left */
4314                         break;
4315                 }
4316                 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at));
4317         }
4318         /* Now update any rwnd --- possibly */
4319         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) {
4320                 /* From a peer, we get a rwnd report */
4321                 uint32_t a_rwnd;
4322
4323                 SCTP_STAT_INCR(sctps_pdrpfehos);
4324
4325                 bottle_bw = ntohl(cp->bottle_bw);
4326                 on_queue = ntohl(cp->current_onq);
4327                 if (bottle_bw && on_queue) {
4328                         /* a rwnd report is in here */
4329                         if (bottle_bw > on_queue)
4330                                 a_rwnd = bottle_bw - on_queue;
4331                         else
4332                                 a_rwnd = 0;
4333
4334                         if (a_rwnd == 0)
4335                                 stcb->asoc.peers_rwnd = 0;
4336                         else {
4337                                 if (a_rwnd > stcb->asoc.total_flight) {
4338                                         stcb->asoc.peers_rwnd =
4339                                             a_rwnd - stcb->asoc.total_flight;
4340                                 } else {
4341                                         stcb->asoc.peers_rwnd = 0;
4342                                 }
4343                                 if (stcb->asoc.peers_rwnd <
4344                                     stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
4345                                         /* SWS sender side engages */
4346                                         stcb->asoc.peers_rwnd = 0;
4347                                 }
4348                         }
4349                 }
4350         } else {
4351                 SCTP_STAT_INCR(sctps_pdrpfmbox);
4352         }
4353
4354         /* now middle boxes in sat networks get a cwnd bump */
4355         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) &&
4356             (stcb->asoc.sat_t3_loss_recovery == 0) &&
4357             (stcb->asoc.sat_network)) {
4358                 /*
4359                  * This is debateable but for sat networks it makes sense
4360                  * Note if a T3 timer has went off, we will prohibit any
4361                  * changes to cwnd until we exit the t3 loss recovery.
4362                  */
4363                 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb,
4364                     net, cp, &bottle_bw, &on_queue);
4365         }
4366 }
4367
4368 /*
4369  * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to
4370  * still contain IP/SCTP header - stcb: is the tcb found for this packet -
4371  * offset: offset into the mbuf chain to first chunkhdr - length: is the
4372  * length of the complete packet outputs: - length: modified to remaining
4373  * length after control processing - netp: modified to new sctp_nets after
4374  * cookie-echo processing - return NULL to discard the packet (ie. no asoc,
4375  * bad packet,...) otherwise return the tcb for this packet
4376  */
4377 #ifdef __GNUC__
4378 __attribute__((noinline))
4379 #endif
4380         static struct sctp_tcb *
4381                  sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length,
4382              struct sockaddr *src, struct sockaddr *dst,
4383              struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp,
4384              struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen,
4385              uint8_t use_mflowid, uint32_t mflowid,
4386              uint32_t vrf_id, uint16_t port)
4387 {
4388         struct sctp_association *asoc;
4389         uint32_t vtag_in;
4390         int num_chunks = 0;     /* number of control chunks processed */
4391         uint32_t chk_length;
4392         int ret;
4393         int abort_no_unlock = 0;
4394         int ecne_seen = 0;
4395
4396         /*
4397          * How big should this be, and should it be alloc'd? Lets try the
4398          * d-mtu-ceiling for now (2k) and that should hopefully work ...
4399          * until we get into jumbo grams and such..
4400          */
4401         uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE];
4402         struct sctp_tcb *locked_tcb = stcb;
4403         int got_auth = 0;
4404         uint32_t auth_offset = 0, auth_len = 0;
4405         int auth_skipped = 0;
4406         int asconf_cnt = 0;
4407
4408 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4409         struct socket *so;
4410
4411 #endif
4412
4413         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n",
4414             iphlen, *offset, length, (void *)stcb);
4415
4416         /* validate chunk header length... */
4417         if (ntohs(ch->chunk_length) < sizeof(*ch)) {
4418                 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n",
4419                     ntohs(ch->chunk_length));
4420                 if (locked_tcb) {
4421                         SCTP_TCB_UNLOCK(locked_tcb);
4422                 }
4423                 return (NULL);
4424         }
4425         /*
4426          * validate the verification tag
4427          */
4428         vtag_in = ntohl(sh->v_tag);
4429
4430         if (locked_tcb) {
4431                 SCTP_TCB_LOCK_ASSERT(locked_tcb);
4432         }
4433         if (ch->chunk_type == SCTP_INITIATION) {
4434                 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n",
4435                     ntohs(ch->chunk_length), vtag_in);
4436                 if (vtag_in != 0) {
4437                         /* protocol error- silently discard... */
4438                         SCTP_STAT_INCR(sctps_badvtag);
4439                         if (locked_tcb) {
4440                                 SCTP_TCB_UNLOCK(locked_tcb);
4441                         }
4442                         return (NULL);
4443                 }
4444         } else if (ch->chunk_type != SCTP_COOKIE_ECHO) {
4445                 /*
4446                  * If there is no stcb, skip the AUTH chunk and process
4447                  * later after a stcb is found (to validate the lookup was
4448                  * valid.
4449                  */
4450                 if ((ch->chunk_type == SCTP_AUTHENTICATION) &&
4451                     (stcb == NULL) &&
4452                     !SCTP_BASE_SYSCTL(sctp_auth_disable)) {
4453                         /* save this chunk for later processing */
4454                         auth_skipped = 1;
4455                         auth_offset = *offset;
4456                         auth_len = ntohs(ch->chunk_length);
4457
4458                         /* (temporarily) move past this chunk */
4459                         *offset += SCTP_SIZE32(auth_len);
4460                         if (*offset >= length) {
4461                                 /* no more data left in the mbuf chain */
4462                                 *offset = length;
4463                                 if (locked_tcb) {
4464                                         SCTP_TCB_UNLOCK(locked_tcb);
4465                                 }
4466                                 return (NULL);
4467                         }
4468                         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4469                             sizeof(struct sctp_chunkhdr), chunk_buf);
4470                 }
4471                 if (ch == NULL) {
4472                         /* Help */
4473                         *offset = length;
4474                         if (locked_tcb) {
4475                                 SCTP_TCB_UNLOCK(locked_tcb);
4476                         }
4477                         return (NULL);
4478                 }
4479                 if (ch->chunk_type == SCTP_COOKIE_ECHO) {
4480                         goto process_control_chunks;
4481                 }
4482                 /*
4483                  * first check if it's an ASCONF with an unknown src addr we
4484                  * need to look inside to find the association
4485                  */
4486                 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) {
4487                         struct sctp_chunkhdr *asconf_ch = ch;
4488                         uint32_t asconf_offset = 0, asconf_len = 0;
4489
4490                         /* inp's refcount may be reduced */
4491                         SCTP_INP_INCR_REF(inp);
4492
4493                         asconf_offset = *offset;
4494                         do {
4495                                 asconf_len = ntohs(asconf_ch->chunk_length);
4496                                 if (asconf_len < sizeof(struct sctp_asconf_paramhdr))
4497                                         break;
4498                                 stcb = sctp_findassociation_ep_asconf(m,
4499                                     *offset,
4500                                     dst,
4501                                     sh, &inp, netp, vrf_id);
4502                                 if (stcb != NULL)
4503                                         break;
4504                                 asconf_offset += SCTP_SIZE32(asconf_len);
4505                                 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset,
4506                                     sizeof(struct sctp_chunkhdr), chunk_buf);
4507                         } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF);
4508                         if (stcb == NULL) {
4509                                 /*
4510                                  * reduce inp's refcount if not reduced in
4511                                  * sctp_findassociation_ep_asconf().
4512                                  */
4513                                 SCTP_INP_DECR_REF(inp);
4514                         } else {
4515                                 locked_tcb = stcb;
4516                         }
4517
4518                         /* now go back and verify any auth chunk to be sure */
4519                         if (auth_skipped && (stcb != NULL)) {
4520                                 struct sctp_auth_chunk *auth;
4521
4522                                 auth = (struct sctp_auth_chunk *)
4523                                     sctp_m_getptr(m, auth_offset,
4524                                     auth_len, chunk_buf);
4525                                 got_auth = 1;
4526                                 auth_skipped = 0;
4527                                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m,
4528                                     auth_offset)) {
4529                                         /* auth HMAC failed so dump it */
4530                                         *offset = length;
4531                                         if (locked_tcb) {
4532                                                 SCTP_TCB_UNLOCK(locked_tcb);
4533                                         }
4534                                         return (NULL);
4535                                 } else {
4536                                         /* remaining chunks are HMAC checked */
4537                                         stcb->asoc.authenticated = 1;
4538                                 }
4539                         }
4540                 }
4541                 if (stcb == NULL) {
4542                         /* no association, so it's out of the blue... */
4543                         sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp,
4544                             use_mflowid, mflowid,
4545                             vrf_id, port);
4546                         *offset = length;
4547                         if (locked_tcb) {
4548                                 SCTP_TCB_UNLOCK(locked_tcb);
4549                         }
4550                         return (NULL);
4551                 }
4552                 asoc = &stcb->asoc;
4553                 /* ABORT and SHUTDOWN can use either v_tag... */
4554                 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) ||
4555                     (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) ||
4556                     (ch->chunk_type == SCTP_PACKET_DROPPED)) {
4557                         if ((vtag_in == asoc->my_vtag) ||
4558                             ((ch->chunk_flags & SCTP_HAD_NO_TCB) &&
4559                             (vtag_in == asoc->peer_vtag))) {
4560                                 /* this is valid */
4561                         } else {
4562                                 /* drop this packet... */
4563                                 SCTP_STAT_INCR(sctps_badvtag);
4564                                 if (locked_tcb) {
4565                                         SCTP_TCB_UNLOCK(locked_tcb);
4566                                 }
4567                                 return (NULL);
4568                         }
4569                 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
4570                         if (vtag_in != asoc->my_vtag) {
4571                                 /*
4572                                  * this could be a stale SHUTDOWN-ACK or the
4573                                  * peer never got the SHUTDOWN-COMPLETE and
4574                                  * is still hung; we have started a new asoc
4575                                  * but it won't complete until the shutdown
4576                                  * is completed
4577                                  */
4578                                 if (locked_tcb) {
4579                                         SCTP_TCB_UNLOCK(locked_tcb);
4580                                 }
4581                                 sctp_handle_ootb(m, iphlen, *offset, src, dst,
4582                                     sh, inp,
4583                                     use_mflowid, mflowid,
4584                                     vrf_id, port);
4585                                 return (NULL);
4586                         }
4587                 } else {
4588                         /* for all other chunks, vtag must match */
4589                         if (vtag_in != asoc->my_vtag) {
4590                                 /* invalid vtag... */
4591                                 SCTPDBG(SCTP_DEBUG_INPUT3,
4592                                     "invalid vtag: %xh, expect %xh\n",
4593                                     vtag_in, asoc->my_vtag);
4594                                 SCTP_STAT_INCR(sctps_badvtag);
4595                                 if (locked_tcb) {
4596                                         SCTP_TCB_UNLOCK(locked_tcb);
4597                                 }
4598                                 *offset = length;
4599                                 return (NULL);
4600                         }
4601                 }
4602         }                       /* end if !SCTP_COOKIE_ECHO */
4603         /*
4604          * process all control chunks...
4605          */
4606         if (((ch->chunk_type == SCTP_SELECTIVE_ACK) ||
4607             (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) ||
4608             (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) &&
4609             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) {
4610                 /* implied cookie-ack.. we must have lost the ack */
4611                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
4612                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
4613                             stcb->asoc.overall_error_count,
4614                             0,
4615                             SCTP_FROM_SCTP_INPUT,
4616                             __LINE__);
4617                 }
4618                 stcb->asoc.overall_error_count = 0;
4619                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb,
4620                     *netp);
4621         }
4622 process_control_chunks:
4623         while (IS_SCTP_CONTROL(ch)) {
4624                 /* validate chunk length */
4625                 chk_length = ntohs(ch->chunk_length);
4626                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n",
4627                     ch->chunk_type, chk_length);
4628                 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length);
4629                 if (chk_length < sizeof(*ch) ||
4630                     (*offset + (int)chk_length) > length) {
4631                         *offset = length;
4632                         if (locked_tcb) {
4633                                 SCTP_TCB_UNLOCK(locked_tcb);
4634                         }
4635                         return (NULL);
4636                 }
4637                 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks);
4638                 /*
4639                  * INIT-ACK only gets the init ack "header" portion only
4640                  * because we don't have to process the peer's COOKIE. All
4641                  * others get a complete chunk.
4642                  */
4643                 if ((ch->chunk_type == SCTP_INITIATION_ACK) ||
4644                     (ch->chunk_type == SCTP_INITIATION)) {
4645                         /* get an init-ack chunk */
4646                         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4647                             sizeof(struct sctp_init_ack_chunk), chunk_buf);
4648                         if (ch == NULL) {
4649                                 *offset = length;
4650                                 if (locked_tcb) {
4651                                         SCTP_TCB_UNLOCK(locked_tcb);
4652                                 }
4653                                 return (NULL);
4654                         }
4655                 } else {
4656                         /* For cookies and all other chunks. */
4657                         if (chk_length > sizeof(chunk_buf)) {
4658                                 /*
4659                                  * use just the size of the chunk buffer so
4660                                  * the front part of our chunks fit in
4661                                  * contiguous space up to the chunk buffer
4662                                  * size (508 bytes). For chunks that need to
4663                                  * get more than that they must use the
4664                                  * sctp_m_getptr() function or other means
4665                                  * (e.g. know how to parse mbuf chains).
4666                                  * Cookies do this already.
4667                                  */
4668                                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4669                                     (sizeof(chunk_buf) - 4),
4670                                     chunk_buf);
4671                                 if (ch == NULL) {
4672                                         *offset = length;
4673                                         if (locked_tcb) {
4674                                                 SCTP_TCB_UNLOCK(locked_tcb);
4675                                         }
4676                                         return (NULL);
4677                                 }
4678                         } else {
4679                                 /* We can fit it all */
4680                                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4681                                     chk_length, chunk_buf);
4682                                 if (ch == NULL) {
4683                                         SCTP_PRINTF("sctp_process_control: Can't get the all data....\n");
4684                                         *offset = length;
4685                                         if (locked_tcb) {
4686                                                 SCTP_TCB_UNLOCK(locked_tcb);
4687                                         }
4688                                         return (NULL);
4689                                 }
4690                         }
4691                 }
4692                 num_chunks++;
4693                 /* Save off the last place we got a control from */
4694                 if (stcb != NULL) {
4695                         if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) {
4696                                 /*
4697                                  * allow last_control to be NULL if
4698                                  * ASCONF... ASCONF processing will find the
4699                                  * right net later
4700                                  */
4701                                 if ((netp != NULL) && (*netp != NULL))
4702                                         stcb->asoc.last_control_chunk_from = *netp;
4703                         }
4704                 }
4705 #ifdef SCTP_AUDITING_ENABLED
4706                 sctp_audit_log(0xB0, ch->chunk_type);
4707 #endif
4708
4709                 /* check to see if this chunk required auth, but isn't */
4710                 if ((stcb != NULL) &&
4711                     !SCTP_BASE_SYSCTL(sctp_auth_disable) &&
4712                     sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) &&
4713                     !stcb->asoc.authenticated) {
4714                         /* "silently" ignore */
4715                         SCTP_STAT_INCR(sctps_recvauthmissing);
4716                         goto next_chunk;
4717                 }
4718                 switch (ch->chunk_type) {
4719                 case SCTP_INITIATION:
4720                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n");
4721                         /* The INIT chunk must be the only chunk. */
4722                         if ((num_chunks > 1) ||
4723                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4724                                 sctp_abort_association(inp, stcb, m, iphlen,
4725                                     src, dst, sh, NULL,
4726                                     use_mflowid, mflowid,
4727                                     vrf_id, port);
4728                                 *offset = length;
4729                                 return (NULL);
4730                         }
4731                         /* Honor our resource limit. */
4732                         if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) {
4733                                 struct mbuf *op_err;
4734
4735                                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC);
4736                                 sctp_abort_association(inp, stcb, m, iphlen,
4737                                     src, dst, sh, op_err,
4738                                     use_mflowid, mflowid,
4739                                     vrf_id, port);
4740                                 *offset = length;
4741                                 return (NULL);
4742                         }
4743                         sctp_handle_init(m, iphlen, *offset, src, dst, sh,
4744                             (struct sctp_init_chunk *)ch, inp,
4745                             stcb, &abort_no_unlock,
4746                             use_mflowid, mflowid,
4747                             vrf_id, port);
4748                         *offset = length;
4749                         if ((!abort_no_unlock) && (locked_tcb)) {
4750                                 SCTP_TCB_UNLOCK(locked_tcb);
4751                         }
4752                         return (NULL);
4753                         break;
4754                 case SCTP_PAD_CHUNK:
4755                         break;
4756                 case SCTP_INITIATION_ACK:
4757                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT-ACK\n");
4758                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4759                                 /* We are not interested anymore */
4760                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
4761                                         ;
4762                                 } else {
4763                                         if (locked_tcb != stcb) {
4764                                                 /* Very unlikely */
4765                                                 SCTP_TCB_UNLOCK(locked_tcb);
4766                                         }
4767                                         *offset = length;
4768                                         if (stcb) {
4769 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4770                                                 so = SCTP_INP_SO(inp);
4771                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4772                                                 SCTP_TCB_UNLOCK(stcb);
4773                                                 SCTP_SOCKET_LOCK(so, 1);
4774                                                 SCTP_TCB_LOCK(stcb);
4775                                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4776 #endif
4777                                                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27);
4778 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4779                                                 SCTP_SOCKET_UNLOCK(so, 1);
4780 #endif
4781                                         }
4782                                         return (NULL);
4783                                 }
4784                         }
4785                         /* The INIT-ACK chunk must be the only chunk. */
4786                         if ((num_chunks > 1) ||
4787                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4788                                 *offset = length;
4789                                 if (locked_tcb) {
4790                                         SCTP_TCB_UNLOCK(locked_tcb);
4791                                 }
4792                                 return (NULL);
4793                         }
4794                         if ((netp) && (*netp)) {
4795                                 ret = sctp_handle_init_ack(m, iphlen, *offset,
4796                                     src, dst, sh,
4797                                     (struct sctp_init_ack_chunk *)ch,
4798                                     stcb, *netp,
4799                                     &abort_no_unlock,
4800                                     use_mflowid, mflowid,
4801                                     vrf_id);
4802                         } else {
4803                                 ret = -1;
4804                         }
4805                         *offset = length;
4806                         if (abort_no_unlock) {
4807                                 return (NULL);
4808                         }
4809                         /*
4810                          * Special case, I must call the output routine to
4811                          * get the cookie echoed
4812                          */
4813                         if ((stcb != NULL) && (ret == 0)) {
4814                                 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
4815                         }
4816                         if (locked_tcb) {
4817                                 SCTP_TCB_UNLOCK(locked_tcb);
4818                         }
4819                         return (NULL);
4820                         break;
4821                 case SCTP_SELECTIVE_ACK:
4822                         {
4823                                 struct sctp_sack_chunk *sack;
4824                                 int abort_now = 0;
4825                                 uint32_t a_rwnd, cum_ack;
4826                                 uint16_t num_seg, num_dup;
4827                                 uint8_t flags;
4828                                 int offset_seg, offset_dup;
4829
4830                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK\n");
4831                                 SCTP_STAT_INCR(sctps_recvsacks);
4832                                 if (stcb == NULL) {
4833                                         SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing SACK chunk\n");
4834                                         break;
4835                                 }
4836                                 if (chk_length < sizeof(struct sctp_sack_chunk)) {
4837                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n");
4838                                         break;
4839                                 }
4840                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
4841                                         /*-
4842                                          * If we have sent a shutdown-ack, we will pay no
4843                                          * attention to a sack sent in to us since
4844                                          * we don't care anymore.
4845                                          */
4846                                         break;
4847                                 }
4848                                 sack = (struct sctp_sack_chunk *)ch;
4849                                 flags = ch->chunk_flags;
4850                                 cum_ack = ntohl(sack->sack.cum_tsn_ack);
4851                                 num_seg = ntohs(sack->sack.num_gap_ack_blks);
4852                                 num_dup = ntohs(sack->sack.num_dup_tsns);
4853                                 a_rwnd = (uint32_t) ntohl(sack->sack.a_rwnd);
4854                                 if (sizeof(struct sctp_sack_chunk) +
4855                                     num_seg * sizeof(struct sctp_gap_ack_block) +
4856                                     num_dup * sizeof(uint32_t) != chk_length) {
4857                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n");
4858                                         break;
4859                                 }
4860                                 offset_seg = *offset + sizeof(struct sctp_sack_chunk);
4861                                 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
4862                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n",
4863                                     cum_ack, num_seg, a_rwnd);
4864                                 stcb->asoc.seen_a_sack_this_pkt = 1;
4865                                 if ((stcb->asoc.pr_sctp_cnt == 0) &&
4866                                     (num_seg == 0) &&
4867                                     SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
4868                                     (stcb->asoc.saw_sack_with_frags == 0) &&
4869                                     (stcb->asoc.saw_sack_with_nr_frags == 0) &&
4870                                     (!TAILQ_EMPTY(&stcb->asoc.sent_queue))
4871                                     ) {
4872                                         /*
4873                                          * We have a SIMPLE sack having no
4874                                          * prior segments and data on sent
4875                                          * queue to be acked.. Use the
4876                                          * faster path sack processing. We
4877                                          * also allow window update sacks
4878                                          * with no missing segments to go
4879                                          * this way too.
4880                                          */
4881                                         sctp_express_handle_sack(stcb, cum_ack, a_rwnd, &abort_now, ecne_seen);
4882                                 } else {
4883                                         if (netp && *netp)
4884                                                 sctp_handle_sack(m, offset_seg, offset_dup, stcb,
4885                                                     num_seg, 0, num_dup, &abort_now, flags,
4886                                                     cum_ack, a_rwnd, ecne_seen);
4887                                 }
4888                                 if (abort_now) {
4889                                         /* ABORT signal from sack processing */
4890                                         *offset = length;
4891                                         return (NULL);
4892                                 }
4893                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
4894                                     TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
4895                                     (stcb->asoc.stream_queue_cnt == 0)) {
4896                                         sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
4897                                 }
4898                         }
4899                         break;
4900                         /*
4901                          * EY - nr_sack:  If the received chunk is an
4902                          * nr_sack chunk
4903                          */
4904                 case SCTP_NR_SELECTIVE_ACK:
4905                         {
4906                                 struct sctp_nr_sack_chunk *nr_sack;
4907                                 int abort_now = 0;
4908                                 uint32_t a_rwnd, cum_ack;
4909                                 uint16_t num_seg, num_nr_seg, num_dup;
4910                                 uint8_t flags;
4911                                 int offset_seg, offset_dup;
4912
4913                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK\n");
4914                                 SCTP_STAT_INCR(sctps_recvsacks);
4915                                 if (stcb == NULL) {
4916                                         SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing NR-SACK chunk\n");
4917                                         break;
4918                                 }
4919                                 if ((stcb->asoc.sctp_nr_sack_on_off == 0) ||
4920                                     (stcb->asoc.peer_supports_nr_sack == 0)) {
4921                                         goto unknown_chunk;
4922                                 }
4923                                 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) {
4924                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR-SACK chunk, too small\n");
4925                                         break;
4926                                 }
4927                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
4928                                         /*-
4929                                          * If we have sent a shutdown-ack, we will pay no
4930                                          * attention to a sack sent in to us since
4931                                          * we don't care anymore.
4932                                          */
4933                                         break;
4934                                 }
4935                                 nr_sack = (struct sctp_nr_sack_chunk *)ch;
4936                                 flags = ch->chunk_flags;
4937                                 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack);
4938                                 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks);
4939                                 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks);
4940                                 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns);
4941                                 a_rwnd = (uint32_t) ntohl(nr_sack->nr_sack.a_rwnd);
4942                                 if (sizeof(struct sctp_nr_sack_chunk) +
4943                                     (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) +
4944                                     num_dup * sizeof(uint32_t) != chk_length) {
4945                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n");
4946                                         break;
4947                                 }
4948                                 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk);
4949                                 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
4950                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n",
4951                                     cum_ack, num_seg, a_rwnd);
4952                                 stcb->asoc.seen_a_sack_this_pkt = 1;
4953                                 if ((stcb->asoc.pr_sctp_cnt == 0) &&
4954                                     (num_seg == 0) && (num_nr_seg == 0) &&
4955                                     SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
4956                                     (stcb->asoc.saw_sack_with_frags == 0) &&
4957                                     (stcb->asoc.saw_sack_with_nr_frags == 0) &&
4958                                     (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
4959                                         /*
4960                                          * We have a SIMPLE sack having no
4961                                          * prior segments and data on sent
4962                                          * queue to be acked. Use the faster
4963                                          * path sack processing. We also
4964                                          * allow window update sacks with no
4965                                          * missing segments to go this way
4966                                          * too.
4967                                          */
4968                                         sctp_express_handle_sack(stcb, cum_ack, a_rwnd,
4969                                             &abort_now, ecne_seen);
4970                                 } else {
4971                                         if (netp && *netp)
4972                                                 sctp_handle_sack(m, offset_seg, offset_dup, stcb,
4973                                                     num_seg, num_nr_seg, num_dup, &abort_now, flags,
4974                                                     cum_ack, a_rwnd, ecne_seen);
4975                                 }
4976                                 if (abort_now) {
4977                                         /* ABORT signal from sack processing */
4978                                         *offset = length;
4979                                         return (NULL);
4980                                 }
4981                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
4982                                     TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
4983                                     (stcb->asoc.stream_queue_cnt == 0)) {
4984                                         sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
4985                                 }
4986                         }
4987                         break;
4988
4989                 case SCTP_HEARTBEAT_REQUEST:
4990                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n");
4991                         if ((stcb) && netp && *netp) {
4992                                 SCTP_STAT_INCR(sctps_recvheartbeat);
4993                                 sctp_send_heartbeat_ack(stcb, m, *offset,
4994                                     chk_length, *netp);
4995
4996                                 /* He's alive so give him credit */
4997                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
4998                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
4999                                             stcb->asoc.overall_error_count,
5000                                             0,
5001                                             SCTP_FROM_SCTP_INPUT,
5002                                             __LINE__);
5003                                 }
5004                                 stcb->asoc.overall_error_count = 0;
5005                         }
5006                         break;
5007                 case SCTP_HEARTBEAT_ACK:
5008                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT-ACK\n");
5009                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) {
5010                                 /* Its not ours */
5011                                 *offset = length;
5012                                 if (locked_tcb) {
5013                                         SCTP_TCB_UNLOCK(locked_tcb);
5014                                 }
5015                                 return (NULL);
5016                         }
5017                         /* He's alive so give him credit */
5018                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5019                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5020                                     stcb->asoc.overall_error_count,
5021                                     0,
5022                                     SCTP_FROM_SCTP_INPUT,
5023                                     __LINE__);
5024                         }
5025                         stcb->asoc.overall_error_count = 0;
5026                         SCTP_STAT_INCR(sctps_recvheartbeatack);
5027                         if (netp && *netp)
5028                                 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch,
5029                                     stcb, *netp);
5030                         break;
5031                 case SCTP_ABORT_ASSOCIATION:
5032                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n",
5033                             (void *)stcb);
5034                         if ((stcb) && netp && *netp)
5035                                 sctp_handle_abort((struct sctp_abort_chunk *)ch,
5036                                     stcb, *netp);
5037                         *offset = length;
5038                         return (NULL);
5039                         break;
5040                 case SCTP_SHUTDOWN:
5041                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n",
5042                             (void *)stcb);
5043                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) {
5044                                 *offset = length;
5045                                 if (locked_tcb) {
5046                                         SCTP_TCB_UNLOCK(locked_tcb);
5047                                 }
5048                                 return (NULL);
5049                         }
5050                         if (netp && *netp) {
5051                                 int abort_flag = 0;
5052
5053                                 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch,
5054                                     stcb, *netp, &abort_flag);
5055                                 if (abort_flag) {
5056                                         *offset = length;
5057                                         return (NULL);
5058                                 }
5059                         }
5060                         break;
5061                 case SCTP_SHUTDOWN_ACK:
5062                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-ACK, stcb %p\n", (void *)stcb);
5063                         if ((stcb) && (netp) && (*netp))
5064                                 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp);
5065                         *offset = length;
5066                         return (NULL);
5067                         break;
5068
5069                 case SCTP_OPERATION_ERROR:
5070                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP-ERR\n");
5071                         if ((stcb) && netp && *netp && sctp_handle_error(ch, stcb, *netp) < 0) {
5072                                 *offset = length;
5073                                 return (NULL);
5074                         }
5075                         break;
5076                 case SCTP_COOKIE_ECHO:
5077                         SCTPDBG(SCTP_DEBUG_INPUT3,
5078                             "SCTP_COOKIE-ECHO, stcb %p\n", (void *)stcb);
5079                         if ((stcb) && (stcb->asoc.total_output_queue_size)) {
5080                                 ;
5081                         } else {
5082                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5083                                         /* We are not interested anymore */
5084                         abend:
5085                                         if (stcb) {
5086                                                 SCTP_TCB_UNLOCK(stcb);
5087                                         }
5088                                         *offset = length;
5089                                         return (NULL);
5090                                 }
5091                         }
5092                         /*
5093                          * First are we accepting? We do this again here
5094                          * since it is possible that a previous endpoint WAS
5095                          * listening responded to a INIT-ACK and then
5096                          * closed. We opened and bound.. and are now no
5097                          * longer listening.
5098                          */
5099
5100                         if ((stcb == NULL) && (inp->sctp_socket->so_qlen >= inp->sctp_socket->so_qlimit)) {
5101                                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
5102                                     (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) {
5103                                         struct mbuf *op_err;
5104
5105                                         op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC);
5106                                         sctp_abort_association(inp, stcb, m, iphlen,
5107                                             src, dst, sh, op_err,
5108                                             use_mflowid, mflowid,
5109                                             vrf_id, port);
5110                                 }
5111                                 *offset = length;
5112                                 return (NULL);
5113                         } else {
5114                                 struct mbuf *ret_buf;
5115                                 struct sctp_inpcb *linp;
5116
5117                                 if (stcb) {
5118                                         linp = NULL;
5119                                 } else {
5120                                         linp = inp;
5121                                 }
5122
5123                                 if (linp) {
5124                                         SCTP_ASOC_CREATE_LOCK(linp);
5125                                         if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
5126                                             (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
5127                                                 SCTP_ASOC_CREATE_UNLOCK(linp);
5128                                                 goto abend;
5129                                         }
5130                                 }
5131                                 if (netp) {
5132                                         ret_buf =
5133                                             sctp_handle_cookie_echo(m, iphlen,
5134                                             *offset,
5135                                             src, dst,
5136                                             sh,
5137                                             (struct sctp_cookie_echo_chunk *)ch,
5138                                             &inp, &stcb, netp,
5139                                             auth_skipped,
5140                                             auth_offset,
5141                                             auth_len,
5142                                             &locked_tcb,
5143                                             use_mflowid,
5144                                             mflowid,
5145                                             vrf_id,
5146                                             port);
5147                                 } else {
5148                                         ret_buf = NULL;
5149                                 }
5150                                 if (linp) {
5151                                         SCTP_ASOC_CREATE_UNLOCK(linp);
5152                                 }
5153                                 if (ret_buf == NULL) {
5154                                         if (locked_tcb) {
5155                                                 SCTP_TCB_UNLOCK(locked_tcb);
5156                                         }
5157                                         SCTPDBG(SCTP_DEBUG_INPUT3,
5158                                             "GAK, null buffer\n");
5159                                         *offset = length;
5160                                         return (NULL);
5161                                 }
5162                                 /* if AUTH skipped, see if it verified... */
5163                                 if (auth_skipped) {
5164                                         got_auth = 1;
5165                                         auth_skipped = 0;
5166                                 }
5167                                 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) {
5168                                         /*
5169                                          * Restart the timer if we have
5170                                          * pending data
5171                                          */
5172                                         struct sctp_tmit_chunk *chk;
5173
5174                                         chk = TAILQ_FIRST(&stcb->asoc.sent_queue);
5175                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
5176                                 }
5177                         }
5178                         break;
5179                 case SCTP_COOKIE_ACK:
5180                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE-ACK, stcb %p\n", (void *)stcb);
5181                         if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) {
5182                                 if (locked_tcb) {
5183                                         SCTP_TCB_UNLOCK(locked_tcb);
5184                                 }
5185                                 return (NULL);
5186                         }
5187                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5188                                 /* We are not interested anymore */
5189                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
5190                                         ;
5191                                 } else if (stcb) {
5192 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5193                                         so = SCTP_INP_SO(inp);
5194                                         atomic_add_int(&stcb->asoc.refcnt, 1);
5195                                         SCTP_TCB_UNLOCK(stcb);
5196                                         SCTP_SOCKET_LOCK(so, 1);
5197                                         SCTP_TCB_LOCK(stcb);
5198                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
5199 #endif
5200                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27);
5201 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5202                                         SCTP_SOCKET_UNLOCK(so, 1);
5203 #endif
5204                                         *offset = length;
5205                                         return (NULL);
5206                                 }
5207                         }
5208                         /* He's alive so give him credit */
5209                         if ((stcb) && netp && *netp) {
5210                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5211                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5212                                             stcb->asoc.overall_error_count,
5213                                             0,
5214                                             SCTP_FROM_SCTP_INPUT,
5215                                             __LINE__);
5216                                 }
5217                                 stcb->asoc.overall_error_count = 0;
5218                                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp);
5219                         }
5220                         break;
5221                 case SCTP_ECN_ECHO:
5222                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-ECHO\n");
5223                         /* He's alive so give him credit */
5224                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) {
5225                                 /* Its not ours */
5226                                 if (locked_tcb) {
5227                                         SCTP_TCB_UNLOCK(locked_tcb);
5228                                 }
5229                                 *offset = length;
5230                                 return (NULL);
5231                         }
5232                         if (stcb) {
5233                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5234                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5235                                             stcb->asoc.overall_error_count,
5236                                             0,
5237                                             SCTP_FROM_SCTP_INPUT,
5238                                             __LINE__);
5239                                 }
5240                                 stcb->asoc.overall_error_count = 0;
5241                                 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch,
5242                                     stcb);
5243                                 ecne_seen = 1;
5244                         }
5245                         break;
5246                 case SCTP_ECN_CWR:
5247                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-CWR\n");
5248                         /* He's alive so give him credit */
5249                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) {
5250                                 /* Its not ours */
5251                                 if (locked_tcb) {
5252                                         SCTP_TCB_UNLOCK(locked_tcb);
5253                                 }
5254                                 *offset = length;
5255                                 return (NULL);
5256                         }
5257                         if (stcb) {
5258                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5259                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5260                                             stcb->asoc.overall_error_count,
5261                                             0,
5262                                             SCTP_FROM_SCTP_INPUT,
5263                                             __LINE__);
5264                                 }
5265                                 stcb->asoc.overall_error_count = 0;
5266                                 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp);
5267                         }
5268                         break;
5269                 case SCTP_SHUTDOWN_COMPLETE:
5270                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-COMPLETE, stcb %p\n", (void *)stcb);
5271                         /* must be first and only chunk */
5272                         if ((num_chunks > 1) ||
5273                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
5274                                 *offset = length;
5275                                 if (locked_tcb) {
5276                                         SCTP_TCB_UNLOCK(locked_tcb);
5277                                 }
5278                                 return (NULL);
5279                         }
5280                         if ((stcb) && netp && *netp) {
5281                                 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch,
5282                                     stcb, *netp);
5283                         }
5284                         *offset = length;
5285                         return (NULL);
5286                         break;
5287                 case SCTP_ASCONF:
5288                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n");
5289                         /* He's alive so give him credit */
5290                         if (stcb) {
5291                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5292                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5293                                             stcb->asoc.overall_error_count,
5294                                             0,
5295                                             SCTP_FROM_SCTP_INPUT,
5296                                             __LINE__);
5297                                 }
5298                                 stcb->asoc.overall_error_count = 0;
5299                                 sctp_handle_asconf(m, *offset, src,
5300                                     (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0);
5301                                 asconf_cnt++;
5302                         }
5303                         break;
5304                 case SCTP_ASCONF_ACK:
5305                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF-ACK\n");
5306                         if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) {
5307                                 /* Its not ours */
5308                                 if (locked_tcb) {
5309                                         SCTP_TCB_UNLOCK(locked_tcb);
5310                                 }
5311                                 *offset = length;
5312                                 return (NULL);
5313                         }
5314                         if ((stcb) && netp && *netp) {
5315                                 /* He's alive so give him credit */
5316                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5317                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5318                                             stcb->asoc.overall_error_count,
5319                                             0,
5320                                             SCTP_FROM_SCTP_INPUT,
5321                                             __LINE__);
5322                                 }
5323                                 stcb->asoc.overall_error_count = 0;
5324                                 sctp_handle_asconf_ack(m, *offset,
5325                                     (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock);
5326                                 if (abort_no_unlock)
5327                                         return (NULL);
5328                         }
5329                         break;
5330                 case SCTP_FORWARD_CUM_TSN:
5331                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD-TSN\n");
5332                         if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) {
5333                                 /* Its not ours */
5334                                 if (locked_tcb) {
5335                                         SCTP_TCB_UNLOCK(locked_tcb);
5336                                 }
5337                                 *offset = length;
5338                                 return (NULL);
5339                         }
5340                         /* He's alive so give him credit */
5341                         if (stcb) {
5342                                 int abort_flag = 0;
5343
5344                                 stcb->asoc.overall_error_count = 0;
5345                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5346                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5347                                             stcb->asoc.overall_error_count,
5348                                             0,
5349                                             SCTP_FROM_SCTP_INPUT,
5350                                             __LINE__);
5351                                 }
5352                                 *fwd_tsn_seen = 1;
5353                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5354                                         /* We are not interested anymore */
5355 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5356                                         so = SCTP_INP_SO(inp);
5357                                         atomic_add_int(&stcb->asoc.refcnt, 1);
5358                                         SCTP_TCB_UNLOCK(stcb);
5359                                         SCTP_SOCKET_LOCK(so, 1);
5360                                         SCTP_TCB_LOCK(stcb);
5361                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
5362 #endif
5363                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_29);
5364 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5365                                         SCTP_SOCKET_UNLOCK(so, 1);
5366 #endif
5367                                         *offset = length;
5368                                         return (NULL);
5369                                 }
5370                                 sctp_handle_forward_tsn(stcb,
5371                                     (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset);
5372                                 if (abort_flag) {
5373                                         *offset = length;
5374                                         return (NULL);
5375                                 } else {
5376                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5377                                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5378                                                     stcb->asoc.overall_error_count,
5379                                                     0,
5380                                                     SCTP_FROM_SCTP_INPUT,
5381                                                     __LINE__);
5382                                         }
5383                                         stcb->asoc.overall_error_count = 0;
5384                                 }
5385
5386                         }
5387                         break;
5388                 case SCTP_STREAM_RESET:
5389                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n");
5390                         if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) {
5391                                 /* Its not ours */
5392                                 if (locked_tcb) {
5393                                         SCTP_TCB_UNLOCK(locked_tcb);
5394                                 }
5395                                 *offset = length;
5396                                 return (NULL);
5397                         }
5398                         if (stcb->asoc.peer_supports_strreset == 0) {
5399                                 /*
5400                                  * hmm, peer should have announced this, but
5401                                  * we will turn it on since he is sending us
5402                                  * a stream reset.
5403                                  */
5404                                 stcb->asoc.peer_supports_strreset = 1;
5405                         }
5406                         if (sctp_handle_stream_reset(stcb, m, *offset, ch)) {
5407                                 /* stop processing */
5408                                 *offset = length;
5409                                 return (NULL);
5410                         }
5411                         break;
5412                 case SCTP_PACKET_DROPPED:
5413                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n");
5414                         /* re-get it all please */
5415                         if (chk_length < sizeof(struct sctp_pktdrop_chunk)) {
5416                                 /* Its not ours */
5417                                 if (locked_tcb) {
5418                                         SCTP_TCB_UNLOCK(locked_tcb);
5419                                 }
5420                                 *offset = length;
5421                                 return (NULL);
5422                         }
5423                         if (ch && (stcb) && netp && (*netp)) {
5424                                 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch,
5425                                     stcb, *netp,
5426                                     min(chk_length, (sizeof(chunk_buf) - 4)));
5427
5428                         }
5429                         break;
5430
5431                 case SCTP_AUTHENTICATION:
5432                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n");
5433                         if (SCTP_BASE_SYSCTL(sctp_auth_disable))
5434                                 goto unknown_chunk;
5435
5436                         if (stcb == NULL) {
5437                                 /* save the first AUTH for later processing */
5438                                 if (auth_skipped == 0) {
5439                                         auth_offset = *offset;
5440                                         auth_len = chk_length;
5441                                         auth_skipped = 1;
5442                                 }
5443                                 /* skip this chunk (temporarily) */
5444                                 goto next_chunk;
5445                         }
5446                         if ((chk_length < (sizeof(struct sctp_auth_chunk))) ||
5447                             (chk_length > (sizeof(struct sctp_auth_chunk) +
5448                             SCTP_AUTH_DIGEST_LEN_MAX))) {
5449                                 /* Its not ours */
5450                                 if (locked_tcb) {
5451                                         SCTP_TCB_UNLOCK(locked_tcb);
5452                                 }
5453                                 *offset = length;
5454                                 return (NULL);
5455                         }
5456                         if (got_auth == 1) {
5457                                 /* skip this chunk... it's already auth'd */
5458                                 goto next_chunk;
5459                         }
5460                         got_auth = 1;
5461                         if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch,
5462                             m, *offset)) {
5463                                 /* auth HMAC failed so dump the packet */
5464                                 *offset = length;
5465                                 return (stcb);
5466                         } else {
5467                                 /* remaining chunks are HMAC checked */
5468                                 stcb->asoc.authenticated = 1;
5469                         }
5470                         break;
5471
5472                 default:
5473         unknown_chunk:
5474                         /* it's an unknown chunk! */
5475                         if ((ch->chunk_type & 0x40) && (stcb != NULL)) {
5476                                 struct mbuf *mm;
5477                                 struct sctp_paramhdr *phd;
5478
5479                                 mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
5480                                     0, M_DONTWAIT, 1, MT_DATA);
5481                                 if (mm) {
5482                                         phd = mtod(mm, struct sctp_paramhdr *);
5483                                         /*
5484                                          * We cheat and use param type since
5485                                          * we did not bother to define a
5486                                          * error cause struct. They are the
5487                                          * same basic format with different
5488                                          * names.
5489                                          */
5490                                         phd->param_type = htons(SCTP_CAUSE_UNRECOG_CHUNK);
5491                                         phd->param_length = htons(chk_length + sizeof(*phd));
5492                                         SCTP_BUF_LEN(mm) = sizeof(*phd);
5493                                         SCTP_BUF_NEXT(mm) = SCTP_M_COPYM(m, *offset, chk_length, M_DONTWAIT);
5494                                         if (SCTP_BUF_NEXT(mm)) {
5495                                                 if (sctp_pad_lastmbuf(SCTP_BUF_NEXT(mm), SCTP_SIZE32(chk_length) - chk_length, NULL)) {
5496                                                         sctp_m_freem(mm);
5497                                                 } else {
5498 #ifdef SCTP_MBUF_LOGGING
5499                                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5500                                                                 struct mbuf *mat;
5501
5502                                                                 for (mat = SCTP_BUF_NEXT(mm); mat; mat = SCTP_BUF_NEXT(mat)) {
5503                                                                         if (SCTP_BUF_IS_EXTENDED(mat)) {
5504                                                                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
5505                                                                         }
5506                                                                 }
5507                                                         }
5508 #endif
5509                                                         sctp_queue_op_err(stcb, mm);
5510                                                 }
5511                                         } else {
5512                                                 sctp_m_freem(mm);
5513                                         }
5514                                 }
5515                         }
5516                         if ((ch->chunk_type & 0x80) == 0) {
5517                                 /* discard this packet */
5518                                 *offset = length;
5519                                 return (stcb);
5520                         }       /* else skip this bad chunk and continue... */
5521                         break;
5522                 }               /* switch (ch->chunk_type) */
5523
5524
5525 next_chunk:
5526                 /* get the next chunk */
5527                 *offset += SCTP_SIZE32(chk_length);
5528                 if (*offset >= length) {
5529                         /* no more data left in the mbuf chain */
5530                         break;
5531                 }
5532                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
5533                     sizeof(struct sctp_chunkhdr), chunk_buf);
5534                 if (ch == NULL) {
5535                         if (locked_tcb) {
5536                                 SCTP_TCB_UNLOCK(locked_tcb);
5537                         }
5538                         *offset = length;
5539                         return (NULL);
5540                 }
5541         }                       /* while */
5542
5543         if (asconf_cnt > 0 && stcb != NULL) {
5544                 sctp_send_asconf_ack(stcb);
5545         }
5546         return (stcb);
5547 }
5548
5549
5550 #ifdef INVARIANTS
5551 #ifdef __GNUC__
5552 __attribute__((noinline))
5553 #endif
5554         void
5555              sctp_validate_no_locks(struct sctp_inpcb *inp)
5556 {
5557         struct sctp_tcb *lstcb;
5558
5559         LIST_FOREACH(lstcb, &inp->sctp_asoc_list, sctp_tcblist) {
5560                 if (mtx_owned(&lstcb->tcb_mtx)) {
5561                         panic("Own lock on stcb at return from input");
5562                 }
5563         }
5564         if (mtx_owned(&inp->inp_create_mtx)) {
5565                 panic("Own create lock on inp");
5566         }
5567         if (mtx_owned(&inp->inp_mtx)) {
5568                 panic("Own inp lock on inp");
5569         }
5570 }
5571
5572 #endif
5573
5574 /*
5575  * common input chunk processing (v4 and v6)
5576  */
5577 void
5578 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length,
5579     struct sockaddr *src, struct sockaddr *dst,
5580     struct sctphdr *sh, struct sctp_chunkhdr *ch,
5581 #if !defined(SCTP_WITH_NO_CSUM)
5582     uint8_t compute_crc,
5583 #endif
5584     uint8_t ecn_bits,
5585     uint8_t use_mflowid, uint32_t mflowid,
5586     uint32_t vrf_id, uint16_t port)
5587 {
5588         uint32_t high_tsn;
5589         int fwd_tsn_seen = 0, data_processed = 0;
5590         struct mbuf *m = *mm;
5591         int un_sent;
5592         int cnt_ctrl_ready = 0;
5593         struct sctp_inpcb *inp = NULL, *inp_decr = NULL;
5594         struct sctp_tcb *stcb = NULL;
5595         struct sctp_nets *net = NULL;
5596
5597         SCTP_STAT_INCR(sctps_recvdatagrams);
5598 #ifdef SCTP_AUDITING_ENABLED
5599         sctp_audit_log(0xE0, 1);
5600         sctp_auditing(0, inp, stcb, net);
5601 #endif
5602 #if !defined(SCTP_WITH_NO_CSUM)
5603         if (compute_crc != 0) {
5604                 uint32_t check, calc_check;
5605
5606                 check = sh->checksum;
5607                 sh->checksum = 0;
5608                 calc_check = sctp_calculate_cksum(m, iphlen);
5609                 sh->checksum = check;
5610                 if (calc_check != check) {
5611                         SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x  m:%p mlen:%d iphlen:%d\n",
5612                             calc_check, check, (void *)m, length, iphlen);
5613                         stcb = sctp_findassociation_addr(m, offset, src, dst,
5614                             sh, ch, &inp, &net, vrf_id);
5615                         if ((net != NULL) && (port != 0)) {
5616                                 if (net->port == 0) {
5617                                         sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr));
5618                                 }
5619                                 net->port = port;
5620                         }
5621                         if ((net != NULL) && (use_mflowid != 0)) {
5622                                 net->flowid = mflowid;
5623 #ifdef INVARIANTS
5624                                 net->flowidset = 1;
5625 #endif
5626                         }
5627                         if ((inp != NULL) && (stcb != NULL)) {
5628                                 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1);
5629                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED);
5630                         } else if ((inp != NULL) && (stcb == NULL)) {
5631                                 inp_decr = inp;
5632                         }
5633                         SCTP_STAT_INCR(sctps_badsum);
5634                         SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors);
5635                         goto out;
5636                 }
5637         }
5638 #endif
5639         /* Destination port of 0 is illegal, based on RFC4960. */
5640         if (sh->dest_port == 0) {
5641                 SCTP_STAT_INCR(sctps_hdrops);
5642                 goto out;
5643         }
5644         stcb = sctp_findassociation_addr(m, offset, src, dst,
5645             sh, ch, &inp, &net, vrf_id);
5646         if ((net != NULL) && (port != 0)) {
5647                 if (net->port == 0) {
5648                         sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr));
5649                 }
5650                 net->port = port;
5651         }
5652         if ((net != NULL) && (use_mflowid != 0)) {
5653                 net->flowid = mflowid;
5654 #ifdef INVARIANTS
5655                 net->flowidset = 1;
5656 #endif
5657         }
5658         if (inp == NULL) {
5659                 SCTP_STAT_INCR(sctps_noport);
5660                 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) {
5661                         goto out;
5662                 }
5663                 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
5664                         sctp_send_shutdown_complete2(src, dst, sh,
5665                             use_mflowid, mflowid,
5666                             vrf_id, port);
5667                         goto out;
5668                 }
5669                 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) {
5670                         goto out;
5671                 }
5672                 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) {
5673                         if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) ||
5674                             ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) &&
5675                             (ch->chunk_type != SCTP_INIT))) {
5676                                 sctp_send_abort(m, iphlen, src, dst,
5677                                     sh, 0, NULL,
5678                                     use_mflowid, mflowid,
5679                                     vrf_id, port);
5680                         }
5681                 }
5682                 goto out;
5683         } else if (stcb == NULL) {
5684                 inp_decr = inp;
5685         }
5686 #ifdef IPSEC
5687         /*-
5688          * I very much doubt any of the IPSEC stuff will work but I have no
5689          * idea, so I will leave it in place.
5690          */
5691         if (inp != NULL) {
5692                 switch (dst->sa_family) {
5693 #ifdef INET
5694                 case AF_INET:
5695                         if (ipsec4_in_reject(m, &inp->ip_inp.inp)) {
5696                                 MODULE_GLOBAL(ipsec4stat).in_polvio++;
5697                                 SCTP_STAT_INCR(sctps_hdrops);
5698                                 goto out;
5699                         }
5700                         break;
5701 #endif
5702 #ifdef INET6
5703                 case AF_INET6:
5704                         if (ipsec6_in_reject(m, &inp->ip_inp.inp)) {
5705                                 MODULE_GLOBAL(ipsec6stat).in_polvio++;
5706                                 SCTP_STAT_INCR(sctps_hdrops);
5707                                 goto out;
5708                         }
5709                         break;
5710 #endif
5711                 default:
5712                         break;
5713                 }
5714         }
5715 #endif
5716         SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n",
5717             (void *)m, iphlen, offset, length, (void *)stcb);
5718         if (stcb) {
5719                 /* always clear this before beginning a packet */
5720                 stcb->asoc.authenticated = 0;
5721                 stcb->asoc.seen_a_sack_this_pkt = 0;
5722                 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n",
5723                     (void *)stcb, stcb->asoc.state);
5724
5725                 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) ||
5726                     (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) {
5727                         /*-
5728                          * If we hit here, we had a ref count
5729                          * up when the assoc was aborted and the
5730                          * timer is clearing out the assoc, we should
5731                          * NOT respond to any packet.. its OOTB.
5732                          */
5733                         SCTP_TCB_UNLOCK(stcb);
5734                         stcb = NULL;
5735                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp,
5736                             use_mflowid, mflowid,
5737                             vrf_id, port);
5738                         goto out;
5739                 }
5740         }
5741         if (IS_SCTP_CONTROL(ch)) {
5742                 /* process the control portion of the SCTP packet */
5743                 /* sa_ignore NO_NULL_CHK */
5744                 stcb = sctp_process_control(m, iphlen, &offset, length,
5745                     src, dst, sh, ch,
5746                     inp, stcb, &net, &fwd_tsn_seen,
5747                     use_mflowid, mflowid,
5748                     vrf_id, port);
5749                 if (stcb) {
5750                         /*
5751                          * This covers us if the cookie-echo was there and
5752                          * it changes our INP.
5753                          */
5754                         inp = stcb->sctp_ep;
5755                         if ((net) && (port)) {
5756                                 if (net->port == 0) {
5757                                         sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr));
5758                                 }
5759                                 net->port = port;
5760                         }
5761                 }
5762         } else {
5763                 /*
5764                  * no control chunks, so pre-process DATA chunks (these
5765                  * checks are taken care of by control processing)
5766                  */
5767
5768                 /*
5769                  * if DATA only packet, and auth is required, then punt...
5770                  * can't have authenticated without any AUTH (control)
5771                  * chunks
5772                  */
5773                 if ((stcb != NULL) &&
5774                     !SCTP_BASE_SYSCTL(sctp_auth_disable) &&
5775                     sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) {
5776                         /* "silently" ignore */
5777                         SCTP_STAT_INCR(sctps_recvauthmissing);
5778                         goto out;
5779                 }
5780                 if (stcb == NULL) {
5781                         /* out of the blue DATA chunk */
5782                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp,
5783                             use_mflowid, mflowid,
5784                             vrf_id, port);
5785                         goto out;
5786                 }
5787                 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) {
5788                         /* v_tag mismatch! */
5789                         SCTP_STAT_INCR(sctps_badvtag);
5790                         goto out;
5791                 }
5792         }
5793
5794         if (stcb == NULL) {
5795                 /*
5796                  * no valid TCB for this packet, or we found it's a bad
5797                  * packet while processing control, or we're done with this
5798                  * packet (done or skip rest of data), so we drop it...
5799                  */
5800                 goto out;
5801         }
5802         /*
5803          * DATA chunk processing
5804          */
5805         /* plow through the data chunks while length > offset */
5806
5807         /*
5808          * Rest should be DATA only.  Check authentication state if AUTH for
5809          * DATA is required.
5810          */
5811         if ((length > offset) &&
5812             (stcb != NULL) &&
5813             !SCTP_BASE_SYSCTL(sctp_auth_disable) &&
5814             sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) &&
5815             !stcb->asoc.authenticated) {
5816                 /* "silently" ignore */
5817                 SCTP_STAT_INCR(sctps_recvauthmissing);
5818                 SCTPDBG(SCTP_DEBUG_AUTH1,
5819                     "Data chunk requires AUTH, skipped\n");
5820                 goto trigger_send;
5821         }
5822         if (length > offset) {
5823                 int retval;
5824
5825                 /*
5826                  * First check to make sure our state is correct. We would
5827                  * not get here unless we really did have a tag, so we don't
5828                  * abort if this happens, just dump the chunk silently.
5829                  */
5830                 switch (SCTP_GET_STATE(&stcb->asoc)) {
5831                 case SCTP_STATE_COOKIE_ECHOED:
5832                         /*
5833                          * we consider data with valid tags in this state
5834                          * shows us the cookie-ack was lost. Imply it was
5835                          * there.
5836                          */
5837                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5838                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5839                                     stcb->asoc.overall_error_count,
5840                                     0,
5841                                     SCTP_FROM_SCTP_INPUT,
5842                                     __LINE__);
5843                         }
5844                         stcb->asoc.overall_error_count = 0;
5845                         sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net);
5846                         break;
5847                 case SCTP_STATE_COOKIE_WAIT:
5848                         /*
5849                          * We consider OOTB any data sent during asoc setup.
5850                          */
5851                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp,
5852                             use_mflowid, mflowid,
5853                             vrf_id, port);
5854                         goto out;
5855                         /* sa_ignore NOTREACHED */
5856                         break;
5857                 case SCTP_STATE_EMPTY:  /* should not happen */
5858                 case SCTP_STATE_INUSE:  /* should not happen */
5859                 case SCTP_STATE_SHUTDOWN_RECEIVED:      /* This is a peer error */
5860                 case SCTP_STATE_SHUTDOWN_ACK_SENT:
5861                 default:
5862                         goto out;
5863                         /* sa_ignore NOTREACHED */
5864                         break;
5865                 case SCTP_STATE_OPEN:
5866                 case SCTP_STATE_SHUTDOWN_SENT:
5867                         break;
5868                 }
5869                 /* plow through the data chunks while length > offset */
5870                 retval = sctp_process_data(mm, iphlen, &offset, length,
5871                     src, dst, sh,
5872                     inp, stcb, net, &high_tsn,
5873                     use_mflowid, mflowid,
5874                     vrf_id, port);
5875                 if (retval == 2) {
5876                         /*
5877                          * The association aborted, NO UNLOCK needed since
5878                          * the association is destroyed.
5879                          */
5880                         stcb = NULL;
5881                         goto out;
5882                 }
5883                 data_processed = 1;
5884                 /*
5885                  * Anything important needs to have been m_copy'ed in
5886                  * process_data
5887                  */
5888         }
5889         /* take care of ecn */
5890         if ((data_processed == 1) &&
5891             (stcb->asoc.ecn_allowed == 1) &&
5892             ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) {
5893                 /* Yep, we need to add a ECNE */
5894                 sctp_send_ecn_echo(stcb, net, high_tsn);
5895         }
5896         if ((data_processed == 0) && (fwd_tsn_seen)) {
5897                 int was_a_gap;
5898                 uint32_t highest_tsn;
5899
5900                 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) {
5901                         highest_tsn = stcb->asoc.highest_tsn_inside_nr_map;
5902                 } else {
5903                         highest_tsn = stcb->asoc.highest_tsn_inside_map;
5904                 }
5905                 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn);
5906                 stcb->asoc.send_sack = 1;
5907                 sctp_sack_check(stcb, was_a_gap);
5908         } else if (fwd_tsn_seen) {
5909                 stcb->asoc.send_sack = 1;
5910         }
5911         /* trigger send of any chunks in queue... */
5912 trigger_send:
5913 #ifdef SCTP_AUDITING_ENABLED
5914         sctp_audit_log(0xE0, 2);
5915         sctp_auditing(1, inp, stcb, net);
5916 #endif
5917         SCTPDBG(SCTP_DEBUG_INPUT1,
5918             "Check for chunk output prw:%d tqe:%d tf=%d\n",
5919             stcb->asoc.peers_rwnd,
5920             TAILQ_EMPTY(&stcb->asoc.control_send_queue),
5921             stcb->asoc.total_flight);
5922         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
5923         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
5924                 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq;
5925         }
5926         if (cnt_ctrl_ready ||
5927             ((un_sent) &&
5928             (stcb->asoc.peers_rwnd > 0 ||
5929             (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) {
5930                 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n");
5931                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
5932                 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n");
5933         }
5934 #ifdef SCTP_AUDITING_ENABLED
5935         sctp_audit_log(0xE0, 3);
5936         sctp_auditing(2, inp, stcb, net);
5937 #endif
5938 out:
5939         if (stcb != NULL) {
5940                 SCTP_TCB_UNLOCK(stcb);
5941         }
5942         if (inp_decr != NULL) {
5943                 /* reduce ref-count */
5944                 SCTP_INP_WLOCK(inp_decr);
5945                 SCTP_INP_DECR_REF(inp_decr);
5946                 SCTP_INP_WUNLOCK(inp_decr);
5947         }
5948 #ifdef INVARIANTS
5949         if (inp != NULL) {
5950                 sctp_validate_no_locks(inp);
5951         }
5952 #endif
5953         return;
5954 }
5955
5956 #if 0
5957 static void
5958 sctp_print_mbuf_chain(struct mbuf *m)
5959 {
5960         for (; m; m = SCTP_BUF_NEXT(m)) {
5961                 SCTP_PRINTF("%p: m_len = %ld\n", (void *)m, SCTP_BUF_LEN(m));
5962                 if (SCTP_BUF_IS_EXTENDED(m))
5963                         SCTP_PRINTF("%p: extend_size = %d\n", (void *)m, SCTP_BUF_EXTEND_SIZE(m));
5964         }
5965 }
5966
5967 #endif
5968
5969 #ifdef INET
5970 void
5971 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port)
5972 {
5973         struct mbuf *m;
5974         int iphlen;
5975         uint32_t vrf_id = 0;
5976         uint8_t ecn_bits;
5977         struct sockaddr_in src, dst;
5978         struct ip *ip;
5979         struct sctphdr *sh;
5980         struct sctp_chunkhdr *ch;
5981         int length, offset;
5982
5983 #if !defined(SCTP_WITH_NO_CSUM)
5984         uint8_t compute_crc;
5985
5986 #endif
5987         uint32_t mflowid;
5988         uint8_t use_mflowid;
5989
5990         iphlen = off;
5991         if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) {
5992                 SCTP_RELEASE_PKT(i_pak);
5993                 return;
5994         }
5995         m = SCTP_HEADER_TO_CHAIN(i_pak);
5996 #ifdef SCTP_MBUF_LOGGING
5997         /* Log in any input mbufs */
5998         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5999                 struct mbuf *mat;
6000
6001                 for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
6002                         if (SCTP_BUF_IS_EXTENDED(mat)) {
6003                                 sctp_log_mb(mat, SCTP_MBUF_INPUT);
6004                         }
6005                 }
6006         }
6007 #endif
6008 #ifdef SCTP_PACKET_LOGGING
6009         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
6010                 sctp_packet_log(m);
6011         }
6012 #endif
6013         SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
6014             "sctp_input(): Packet of length %d received on %s with csum_flags 0x%x.\n",
6015             m->m_pkthdr.len,
6016             if_name(m->m_pkthdr.rcvif),
6017             m->m_pkthdr.csum_flags);
6018         if (m->m_flags & M_FLOWID) {
6019                 mflowid = m->m_pkthdr.flowid;
6020                 use_mflowid = 1;
6021         } else {
6022                 mflowid = 0;
6023                 use_mflowid = 0;
6024         }
6025         SCTP_STAT_INCR(sctps_recvpackets);
6026         SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
6027         /* Get IP, SCTP, and first chunk header together in the first mbuf. */
6028         offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
6029         if (SCTP_BUF_LEN(m) < offset) {
6030                 if ((m = m_pullup(m, offset)) == NULL) {
6031                         SCTP_STAT_INCR(sctps_hdrops);
6032                         return;
6033                 }
6034         }
6035         ip = mtod(m, struct ip *);
6036         sh = (struct sctphdr *)((caddr_t)ip + iphlen);
6037         ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr));
6038         offset -= sizeof(struct sctp_chunkhdr);
6039         memset(&src, 0, sizeof(struct sockaddr_in));
6040         src.sin_family = AF_INET;
6041         src.sin_len = sizeof(struct sockaddr_in);
6042         src.sin_port = sh->src_port;
6043         src.sin_addr = ip->ip_src;
6044         memset(&dst, 0, sizeof(struct sockaddr_in));
6045         dst.sin_family = AF_INET;
6046         dst.sin_len = sizeof(struct sockaddr_in);
6047         dst.sin_port = sh->dest_port;
6048         dst.sin_addr = ip->ip_dst;
6049         length = ip->ip_len + iphlen;
6050         /* Validate mbuf chain length with IP payload length. */
6051         if (SCTP_HEADER_LEN(m) != length) {
6052                 SCTPDBG(SCTP_DEBUG_INPUT1,
6053                     "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m));
6054                 SCTP_STAT_INCR(sctps_hdrops);
6055                 goto out;
6056         }
6057         /* SCTP does not allow broadcasts or multicasts */
6058         if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) {
6059                 goto out;
6060         }
6061         if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) {
6062                 goto out;
6063         }
6064         ecn_bits = ip->ip_tos;
6065 #if defined(SCTP_WITH_NO_CSUM)
6066         SCTP_STAT_INCR(sctps_recvnocrc);
6067 #else
6068         if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
6069                 SCTP_STAT_INCR(sctps_recvhwcrc);
6070                 compute_crc = 0;
6071         } else {
6072                 SCTP_STAT_INCR(sctps_recvswcrc);
6073                 compute_crc = 1;
6074         }
6075 #endif
6076         sctp_common_input_processing(&m, iphlen, offset, length,
6077             (struct sockaddr *)&src,
6078             (struct sockaddr *)&dst,
6079             sh, ch,
6080 #if !defined(SCTP_WITH_NO_CSUM)
6081             compute_crc,
6082 #endif
6083             ecn_bits,
6084             use_mflowid, mflowid,
6085             vrf_id, port);
6086 out:
6087         if (m) {
6088                 sctp_m_freem(m);
6089         }
6090         return;
6091 }
6092
6093 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
6094 extern int *sctp_cpuarry;
6095
6096 #endif
6097
6098 void
6099 sctp_input(struct mbuf *m, int off)
6100 {
6101 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
6102         struct ip *ip;
6103         struct sctphdr *sh;
6104         int offset;
6105         int cpu_to_use;
6106         uint32_t flowid, tag;
6107
6108         if (mp_ncpus > 1) {
6109                 if (m->m_flags & M_FLOWID) {
6110                         flowid = m->m_pkthdr.flowid;
6111                 } else {
6112                         /*
6113                          * No flow id built by lower layers fix it so we
6114                          * create one.
6115                          */
6116                         offset = off + sizeof(struct sctphdr);
6117                         if (SCTP_BUF_LEN(m) < offset) {
6118                                 if ((m = m_pullup(m, offset)) == NULL) {
6119                                         SCTP_STAT_INCR(sctps_hdrops);
6120                                         return;
6121                                 }
6122                         }
6123                         ip = mtod(m, struct ip *);
6124                         sh = (struct sctphdr *)((caddr_t)ip + off);
6125                         tag = htonl(sh->v_tag);
6126                         flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port);
6127                         m->m_pkthdr.flowid = flowid;
6128                         m->m_flags |= M_FLOWID;
6129                 }
6130                 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus];
6131                 sctp_queue_to_mcore(m, off, cpu_to_use);
6132                 return;
6133         }
6134 #endif
6135         sctp_input_with_port(m, off, 0);
6136 }
6137
6138 #endif