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 #ifdef INVARIANTS
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                 panic("Queues are not empty when handling SHUTDOWN-ACK");
1036         }
1037 #endif
1038         /* stop the timer */
1039         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9);
1040         /* send SHUTDOWN-COMPLETE */
1041         sctp_send_shutdown_complete(stcb, net, 0);
1042         /* notify upper layer protocol */
1043         if (stcb->sctp_socket) {
1044                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1045                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
1046                         stcb->sctp_socket->so_snd.sb_cc = 0;
1047                 }
1048                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
1049         }
1050         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
1051         /* free the TCB but first save off the ep */
1052 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1053         atomic_add_int(&stcb->asoc.refcnt, 1);
1054         SCTP_TCB_UNLOCK(stcb);
1055         SCTP_SOCKET_LOCK(so, 1);
1056         SCTP_TCB_LOCK(stcb);
1057         atomic_subtract_int(&stcb->asoc.refcnt, 1);
1058 #endif
1059         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1060             SCTP_FROM_SCTP_INPUT + SCTP_LOC_10);
1061 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1062         SCTP_SOCKET_UNLOCK(so, 1);
1063 #endif
1064 }
1065
1066 /*
1067  * Skip past the param header and then we will find the chunk that caused the
1068  * problem. There are two possiblities ASCONF or FWD-TSN other than that and
1069  * our peer must be broken.
1070  */
1071 static void
1072 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr,
1073     struct sctp_nets *net)
1074 {
1075         struct sctp_chunkhdr *chk;
1076
1077         chk = (struct sctp_chunkhdr *)((caddr_t)phdr + sizeof(*phdr));
1078         switch (chk->chunk_type) {
1079         case SCTP_ASCONF_ACK:
1080         case SCTP_ASCONF:
1081                 sctp_asconf_cleanup(stcb, net);
1082                 break;
1083         case SCTP_FORWARD_CUM_TSN:
1084                 stcb->asoc.peer_supports_prsctp = 0;
1085                 break;
1086         default:
1087                 SCTPDBG(SCTP_DEBUG_INPUT2,
1088                     "Peer does not support chunk type %d(%x)??\n",
1089                     chk->chunk_type, (uint32_t) chk->chunk_type);
1090                 break;
1091         }
1092 }
1093
1094 /*
1095  * Skip past the param header and then we will find the param that caused the
1096  * problem.  There are a number of param's in a ASCONF OR the prsctp param
1097  * these will turn of specific features.
1098  */
1099 static void
1100 sctp_process_unrecog_param(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr)
1101 {
1102         struct sctp_paramhdr *pbad;
1103
1104         pbad = phdr + 1;
1105         switch (ntohs(pbad->param_type)) {
1106                 /* pr-sctp draft */
1107         case SCTP_PRSCTP_SUPPORTED:
1108                 stcb->asoc.peer_supports_prsctp = 0;
1109                 break;
1110         case SCTP_SUPPORTED_CHUNK_EXT:
1111                 break;
1112                 /* draft-ietf-tsvwg-addip-sctp */
1113         case SCTP_HAS_NAT_SUPPORT:
1114                 stcb->asoc.peer_supports_nat = 0;
1115                 break;
1116         case SCTP_ADD_IP_ADDRESS:
1117         case SCTP_DEL_IP_ADDRESS:
1118         case SCTP_SET_PRIM_ADDR:
1119                 stcb->asoc.peer_supports_asconf = 0;
1120                 break;
1121         case SCTP_SUCCESS_REPORT:
1122         case SCTP_ERROR_CAUSE_IND:
1123                 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n");
1124                 SCTPDBG(SCTP_DEBUG_INPUT2,
1125                     "Turning off ASCONF to this strange peer\n");
1126                 stcb->asoc.peer_supports_asconf = 0;
1127                 break;
1128         default:
1129                 SCTPDBG(SCTP_DEBUG_INPUT2,
1130                     "Peer does not support param type %d(%x)??\n",
1131                     pbad->param_type, (uint32_t) pbad->param_type);
1132                 break;
1133         }
1134 }
1135
1136 static int
1137 sctp_handle_error(struct sctp_chunkhdr *ch,
1138     struct sctp_tcb *stcb, struct sctp_nets *net)
1139 {
1140         int chklen;
1141         struct sctp_paramhdr *phdr;
1142         uint16_t error, error_type;
1143         uint16_t error_len;
1144         struct sctp_association *asoc;
1145         int adjust;
1146
1147 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1148         struct socket *so;
1149
1150 #endif
1151
1152         /* parse through all of the errors and process */
1153         asoc = &stcb->asoc;
1154         phdr = (struct sctp_paramhdr *)((caddr_t)ch +
1155             sizeof(struct sctp_chunkhdr));
1156         chklen = ntohs(ch->chunk_length) - sizeof(struct sctp_chunkhdr);
1157         error = 0;
1158         while ((size_t)chklen >= sizeof(struct sctp_paramhdr)) {
1159                 /* Process an Error Cause */
1160                 error_type = ntohs(phdr->param_type);
1161                 error_len = ntohs(phdr->param_length);
1162                 if ((error_len > chklen) || (error_len == 0)) {
1163                         /* invalid param length for this param */
1164                         SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in error param- chunk left:%d errorlen:%d\n",
1165                             chklen, error_len);
1166                         return (0);
1167                 }
1168                 if (error == 0) {
1169                         /* report the first error cause */
1170                         error = error_type;
1171                 }
1172                 switch (error_type) {
1173                 case SCTP_CAUSE_INVALID_STREAM:
1174                 case SCTP_CAUSE_MISSING_PARAM:
1175                 case SCTP_CAUSE_INVALID_PARAM:
1176                 case SCTP_CAUSE_NO_USER_DATA:
1177                         SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %d back? We have a bug :/ (or do they?)\n",
1178                             error_type);
1179                         break;
1180                 case SCTP_CAUSE_NAT_COLLIDING_STATE:
1181                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n",
1182                             ch->chunk_flags);
1183                         if (sctp_handle_nat_colliding_state(stcb)) {
1184                                 return (0);
1185                         }
1186                         break;
1187                 case SCTP_CAUSE_NAT_MISSING_STATE:
1188                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n",
1189                             ch->chunk_flags);
1190                         if (sctp_handle_nat_missing_state(stcb, net)) {
1191                                 return (0);
1192                         }
1193                         break;
1194                 case SCTP_CAUSE_STALE_COOKIE:
1195                         /*
1196                          * We only act if we have echoed a cookie and are
1197                          * waiting.
1198                          */
1199                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) {
1200                                 int *p;
1201
1202                                 p = (int *)((caddr_t)phdr + sizeof(*phdr));
1203                                 /* Save the time doubled */
1204                                 asoc->cookie_preserve_req = ntohl(*p) << 1;
1205                                 asoc->stale_cookie_count++;
1206                                 if (asoc->stale_cookie_count >
1207                                     asoc->max_init_times) {
1208                                         sctp_abort_notification(stcb, 0, 0, NULL, SCTP_SO_NOT_LOCKED);
1209                                         /* now free the asoc */
1210 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1211                                         so = SCTP_INP_SO(stcb->sctp_ep);
1212                                         atomic_add_int(&stcb->asoc.refcnt, 1);
1213                                         SCTP_TCB_UNLOCK(stcb);
1214                                         SCTP_SOCKET_LOCK(so, 1);
1215                                         SCTP_TCB_LOCK(stcb);
1216                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
1217 #endif
1218                                         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1219                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_11);
1220 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1221                                         SCTP_SOCKET_UNLOCK(so, 1);
1222 #endif
1223                                         return (-1);
1224                                 }
1225                                 /* blast back to INIT state */
1226                                 sctp_toss_old_cookies(stcb, &stcb->asoc);
1227                                 asoc->state &= ~SCTP_STATE_COOKIE_ECHOED;
1228                                 asoc->state |= SCTP_STATE_COOKIE_WAIT;
1229                                 sctp_stop_all_cookie_timers(stcb);
1230                                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
1231                         }
1232                         break;
1233                 case SCTP_CAUSE_UNRESOLVABLE_ADDR:
1234                         /*
1235                          * Nothing we can do here, we don't do hostname
1236                          * addresses so if the peer does not like my IPv6
1237                          * (or IPv4 for that matter) it does not matter. If
1238                          * they don't support that type of address, they can
1239                          * NOT possibly get that packet type... i.e. with no
1240                          * IPv6 you can't recieve a IPv6 packet. so we can
1241                          * safely ignore this one. If we ever added support
1242                          * for HOSTNAME Addresses, then we would need to do
1243                          * something here.
1244                          */
1245                         break;
1246                 case SCTP_CAUSE_UNRECOG_CHUNK:
1247                         sctp_process_unrecog_chunk(stcb, phdr, net);
1248                         break;
1249                 case SCTP_CAUSE_UNRECOG_PARAM:
1250                         sctp_process_unrecog_param(stcb, phdr);
1251                         break;
1252                 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN:
1253                         /*
1254                          * We ignore this since the timer will drive out a
1255                          * new cookie anyway and there timer will drive us
1256                          * to send a SHUTDOWN_COMPLETE. We can't send one
1257                          * here since we don't have their tag.
1258                          */
1259                         break;
1260                 case SCTP_CAUSE_DELETING_LAST_ADDR:
1261                 case SCTP_CAUSE_RESOURCE_SHORTAGE:
1262                 case SCTP_CAUSE_DELETING_SRC_ADDR:
1263                         /*
1264                          * We should NOT get these here, but in a
1265                          * ASCONF-ACK.
1266                          */
1267                         SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a Operational Error?<%d>?\n",
1268                             error_type);
1269                         break;
1270                 case SCTP_CAUSE_OUT_OF_RESC:
1271                         /*
1272                          * And what, pray tell do we do with the fact that
1273                          * the peer is out of resources? Not really sure we
1274                          * could do anything but abort. I suspect this
1275                          * should have came WITH an abort instead of in a
1276                          * OP-ERROR.
1277                          */
1278                         break;
1279                 default:
1280                         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown error type = 0x%xh\n",
1281                             error_type);
1282                         break;
1283                 }
1284                 adjust = SCTP_SIZE32(error_len);
1285                 chklen -= adjust;
1286                 phdr = (struct sctp_paramhdr *)((caddr_t)phdr + adjust);
1287         }
1288         sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, error, ch, SCTP_SO_NOT_LOCKED);
1289         return (0);
1290 }
1291
1292 static int
1293 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset,
1294     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
1295     struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
1296     struct sctp_nets *net, int *abort_no_unlock,
1297     uint8_t use_mflowid, uint32_t mflowid,
1298     uint32_t vrf_id)
1299 {
1300         struct sctp_init_ack *init_ack;
1301         struct mbuf *op_err;
1302
1303         SCTPDBG(SCTP_DEBUG_INPUT2,
1304             "sctp_handle_init_ack: handling INIT-ACK\n");
1305
1306         if (stcb == NULL) {
1307                 SCTPDBG(SCTP_DEBUG_INPUT2,
1308                     "sctp_handle_init_ack: TCB is null\n");
1309                 return (-1);
1310         }
1311         if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) {
1312                 /* Invalid length */
1313                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
1314                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1315                     src, dst, sh, op_err,
1316                     use_mflowid, mflowid,
1317                     vrf_id, net->port);
1318                 *abort_no_unlock = 1;
1319                 return (-1);
1320         }
1321         init_ack = &cp->init;
1322         /* validate parameters */
1323         if (init_ack->initiate_tag == 0) {
1324                 /* protocol error... send an abort */
1325                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
1326                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1327                     src, dst, sh, op_err,
1328                     use_mflowid, mflowid,
1329                     vrf_id, net->port);
1330                 *abort_no_unlock = 1;
1331                 return (-1);
1332         }
1333         if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) {
1334                 /* protocol error... send an abort */
1335                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
1336                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1337                     src, dst, sh, op_err,
1338                     use_mflowid, mflowid,
1339                     vrf_id, net->port);
1340                 *abort_no_unlock = 1;
1341                 return (-1);
1342         }
1343         if (init_ack->num_inbound_streams == 0) {
1344                 /* protocol error... send an abort */
1345                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
1346                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1347                     src, dst, sh, op_err,
1348                     use_mflowid, mflowid,
1349                     vrf_id, net->port);
1350                 *abort_no_unlock = 1;
1351                 return (-1);
1352         }
1353         if (init_ack->num_outbound_streams == 0) {
1354                 /* protocol error... send an abort */
1355                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
1356                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1357                     src, dst, sh, op_err,
1358                     use_mflowid, mflowid,
1359                     vrf_id, net->port);
1360                 *abort_no_unlock = 1;
1361                 return (-1);
1362         }
1363         /* process according to association state... */
1364         switch (stcb->asoc.state & SCTP_STATE_MASK) {
1365         case SCTP_STATE_COOKIE_WAIT:
1366                 /* this is the expected state for this chunk */
1367                 /* process the INIT-ACK parameters */
1368                 if (stcb->asoc.primary_destination->dest_state &
1369                     SCTP_ADDR_UNCONFIRMED) {
1370                         /*
1371                          * The primary is where we sent the INIT, we can
1372                          * always consider it confirmed when the INIT-ACK is
1373                          * returned. Do this before we load addresses
1374                          * though.
1375                          */
1376                         stcb->asoc.primary_destination->dest_state &=
1377                             ~SCTP_ADDR_UNCONFIRMED;
1378                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
1379                             stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED);
1380                 }
1381                 if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb,
1382                     net, abort_no_unlock,
1383                     use_mflowid, mflowid,
1384                     vrf_id) < 0) {
1385                         /* error in parsing parameters */
1386                         return (-1);
1387                 }
1388                 /* update our state */
1389                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n");
1390                 SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_ECHOED);
1391
1392                 /* reset the RTO calc */
1393                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
1394                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
1395                             stcb->asoc.overall_error_count,
1396                             0,
1397                             SCTP_FROM_SCTP_INPUT,
1398                             __LINE__);
1399                 }
1400                 stcb->asoc.overall_error_count = 0;
1401                 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
1402                 /*
1403                  * collapse the init timer back in case of a exponential
1404                  * backoff
1405                  */
1406                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep,
1407                     stcb, net);
1408                 /*
1409                  * the send at the end of the inbound data processing will
1410                  * cause the cookie to be sent
1411                  */
1412                 break;
1413         case SCTP_STATE_SHUTDOWN_SENT:
1414                 /* incorrect state... discard */
1415                 break;
1416         case SCTP_STATE_COOKIE_ECHOED:
1417                 /* incorrect state... discard */
1418                 break;
1419         case SCTP_STATE_OPEN:
1420                 /* incorrect state... discard */
1421                 break;
1422         case SCTP_STATE_EMPTY:
1423         case SCTP_STATE_INUSE:
1424         default:
1425                 /* incorrect state... discard */
1426                 return (-1);
1427                 break;
1428         }
1429         SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n");
1430         return (0);
1431 }
1432
1433 static struct sctp_tcb *
1434 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
1435     struct sockaddr *src, struct sockaddr *dst,
1436     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1437     struct sctp_inpcb *inp, struct sctp_nets **netp,
1438     struct sockaddr *init_src, int *notification,
1439     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1440     uint8_t use_mflowid, uint32_t mflowid,
1441     uint32_t vrf_id, uint16_t port);
1442
1443
1444 /*
1445  * handle a state cookie for an existing association m: input packet mbuf
1446  * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a
1447  * "split" mbuf and the cookie signature does not exist offset: offset into
1448  * mbuf to the cookie-echo chunk
1449  */
1450 static struct sctp_tcb *
1451 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset,
1452     struct sockaddr *src, struct sockaddr *dst,
1453     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1454     struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp,
1455     struct sockaddr *init_src, int *notification,
1456     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1457     uint8_t use_mflowid, uint32_t mflowid,
1458     uint32_t vrf_id, uint16_t port)
1459 {
1460         struct sctp_association *asoc;
1461         struct sctp_init_chunk *init_cp, init_buf;
1462         struct sctp_init_ack_chunk *initack_cp, initack_buf;
1463         struct sctp_nets *net;
1464         struct mbuf *op_err;
1465         struct sctp_paramhdr *ph;
1466         int init_offset, initack_offset, i;
1467         int retval;
1468         int spec_flag = 0;
1469         uint32_t how_indx;
1470
1471         net = *netp;
1472         /* I know that the TCB is non-NULL from the caller */
1473         asoc = &stcb->asoc;
1474         for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) {
1475                 if (asoc->cookie_how[how_indx] == 0)
1476                         break;
1477         }
1478         if (how_indx < sizeof(asoc->cookie_how)) {
1479                 asoc->cookie_how[how_indx] = 1;
1480         }
1481         if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
1482                 /* SHUTDOWN came in after sending INIT-ACK */
1483                 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination);
1484                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
1485                     0, M_DONTWAIT, 1, MT_DATA);
1486                 if (op_err == NULL) {
1487                         /* FOOBAR */
1488                         return (NULL);
1489                 }
1490                 /* Set the len */
1491                 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_paramhdr);
1492                 ph = mtod(op_err, struct sctp_paramhdr *);
1493                 ph->param_type = htons(SCTP_CAUSE_COOKIE_IN_SHUTDOWN);
1494                 ph->param_length = htons(sizeof(struct sctp_paramhdr));
1495                 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
1496                     use_mflowid, mflowid,
1497                     vrf_id, net->port);
1498                 if (how_indx < sizeof(asoc->cookie_how))
1499                         asoc->cookie_how[how_indx] = 2;
1500                 return (NULL);
1501         }
1502         /*
1503          * find and validate the INIT chunk in the cookie (peer's info) the
1504          * INIT should start after the cookie-echo header struct (chunk
1505          * header, state cookie header struct)
1506          */
1507         init_offset = offset += sizeof(struct sctp_cookie_echo_chunk);
1508
1509         init_cp = (struct sctp_init_chunk *)
1510             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
1511             (uint8_t *) & init_buf);
1512         if (init_cp == NULL) {
1513                 /* could not pull a INIT chunk in cookie */
1514                 return (NULL);
1515         }
1516         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
1517                 return (NULL);
1518         }
1519         /*
1520          * find and validate the INIT-ACK chunk in the cookie (my info) the
1521          * INIT-ACK follows the INIT chunk
1522          */
1523         initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
1524         initack_cp = (struct sctp_init_ack_chunk *)
1525             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
1526             (uint8_t *) & initack_buf);
1527         if (initack_cp == NULL) {
1528                 /* could not pull INIT-ACK chunk in cookie */
1529                 return (NULL);
1530         }
1531         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
1532                 return (NULL);
1533         }
1534         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1535             (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) {
1536                 /*
1537                  * case D in Section 5.2.4 Table 2: MMAA process accordingly
1538                  * to get into the OPEN state
1539                  */
1540                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1541                         /*-
1542                          * Opps, this means that we somehow generated two vtag's
1543                          * the same. I.e. we did:
1544                          *  Us               Peer
1545                          *   <---INIT(tag=a)------
1546                          *   ----INIT-ACK(tag=t)-->
1547                          *   ----INIT(tag=t)------> *1
1548                          *   <---INIT-ACK(tag=a)---
1549                          *   <----CE(tag=t)------------- *2
1550                          *
1551                          * At point *1 we should be generating a different
1552                          * tag t'. Which means we would throw away the CE and send
1553                          * ours instead. Basically this is case C (throw away side).
1554                          */
1555                         if (how_indx < sizeof(asoc->cookie_how))
1556                                 asoc->cookie_how[how_indx] = 17;
1557                         return (NULL);
1558
1559                 }
1560                 switch SCTP_GET_STATE
1561                         (asoc) {
1562                 case SCTP_STATE_COOKIE_WAIT:
1563                 case SCTP_STATE_COOKIE_ECHOED:
1564                         /*
1565                          * INIT was sent but got a COOKIE_ECHO with the
1566                          * correct tags... just accept it...but we must
1567                          * process the init so that we can make sure we have
1568                          * the right seq no's.
1569                          */
1570                         /* First we must process the INIT !! */
1571                         retval = sctp_process_init(init_cp, stcb);
1572                         if (retval < 0) {
1573                                 if (how_indx < sizeof(asoc->cookie_how))
1574                                         asoc->cookie_how[how_indx] = 3;
1575                                 return (NULL);
1576                         }
1577                         /* we have already processed the INIT so no problem */
1578                         sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb,
1579                             net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_12);
1580                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_13);
1581                         /* update current state */
1582                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)
1583                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1584                         else
1585                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1586
1587                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1588                         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1589                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1590                                     stcb->sctp_ep, stcb, asoc->primary_destination);
1591                         }
1592                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1593                         sctp_stop_all_cookie_timers(stcb);
1594                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1595                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1596                             (inp->sctp_socket->so_qlimit == 0)
1597                             ) {
1598 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1599                                 struct socket *so;
1600
1601 #endif
1602                                 /*
1603                                  * Here is where collision would go if we
1604                                  * did a connect() and instead got a
1605                                  * init/init-ack/cookie done before the
1606                                  * init-ack came back..
1607                                  */
1608                                 stcb->sctp_ep->sctp_flags |=
1609                                     SCTP_PCB_FLAGS_CONNECTED;
1610 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1611                                 so = SCTP_INP_SO(stcb->sctp_ep);
1612                                 atomic_add_int(&stcb->asoc.refcnt, 1);
1613                                 SCTP_TCB_UNLOCK(stcb);
1614                                 SCTP_SOCKET_LOCK(so, 1);
1615                                 SCTP_TCB_LOCK(stcb);
1616                                 atomic_add_int(&stcb->asoc.refcnt, -1);
1617                                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1618                                         SCTP_SOCKET_UNLOCK(so, 1);
1619                                         return (NULL);
1620                                 }
1621 #endif
1622                                 soisconnected(stcb->sctp_socket);
1623 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1624                                 SCTP_SOCKET_UNLOCK(so, 1);
1625 #endif
1626                         }
1627                         /* notify upper layer */
1628                         *notification = SCTP_NOTIFY_ASSOC_UP;
1629                         /*
1630                          * since we did not send a HB make sure we don't
1631                          * double things
1632                          */
1633                         net->hb_responded = 1;
1634                         net->RTO = sctp_calculate_rto(stcb, asoc, net,
1635                             &cookie->time_entered,
1636                             sctp_align_unsafe_makecopy,
1637                             SCTP_RTT_FROM_NON_DATA);
1638
1639                         if (stcb->asoc.sctp_autoclose_ticks &&
1640                             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) {
1641                                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
1642                                     inp, stcb, NULL);
1643                         }
1644                         break;
1645                 default:
1646                         /*
1647                          * we're in the OPEN state (or beyond), so peer must
1648                          * have simply lost the COOKIE-ACK
1649                          */
1650                         break;
1651                         }       /* end switch */
1652                 sctp_stop_all_cookie_timers(stcb);
1653                 /*
1654                  * We ignore the return code here.. not sure if we should
1655                  * somehow abort.. but we do have an existing asoc. This
1656                  * really should not fail.
1657                  */
1658                 if (sctp_load_addresses_from_init(stcb, m,
1659                     init_offset + sizeof(struct sctp_init_chunk),
1660                     initack_offset, src, dst, init_src)) {
1661                         if (how_indx < sizeof(asoc->cookie_how))
1662                                 asoc->cookie_how[how_indx] = 4;
1663                         return (NULL);
1664                 }
1665                 /* respond with a COOKIE-ACK */
1666                 sctp_toss_old_cookies(stcb, asoc);
1667                 sctp_send_cookie_ack(stcb);
1668                 if (how_indx < sizeof(asoc->cookie_how))
1669                         asoc->cookie_how[how_indx] = 5;
1670                 return (stcb);
1671         }
1672         if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1673             ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag &&
1674             cookie->tie_tag_my_vtag == 0 &&
1675             cookie->tie_tag_peer_vtag == 0) {
1676                 /*
1677                  * case C in Section 5.2.4 Table 2: XMOO silently discard
1678                  */
1679                 if (how_indx < sizeof(asoc->cookie_how))
1680                         asoc->cookie_how[how_indx] = 6;
1681                 return (NULL);
1682         }
1683         /*
1684          * If nat support, and the below and stcb is established, send back
1685          * a ABORT(colliding state) if we are established.
1686          */
1687         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) &&
1688             (asoc->peer_supports_nat) &&
1689             ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1690             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1691             (asoc->peer_vtag == 0)))) {
1692                 /*
1693                  * Special case - Peer's support nat. We may have two init's
1694                  * that we gave out the same tag on since one was not
1695                  * established.. i.e. we get INIT from host-1 behind the nat
1696                  * and we respond tag-a, we get a INIT from host-2 behind
1697                  * the nat and we get tag-a again. Then we bring up host-1
1698                  * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1).
1699                  * Now we have colliding state. We must send an abort here
1700                  * with colliding state indication.
1701                  */
1702                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
1703                     0, M_DONTWAIT, 1, MT_DATA);
1704                 if (op_err == NULL) {
1705                         /* FOOBAR */
1706                         return (NULL);
1707                 }
1708                 /* pre-reserve some space */
1709 #ifdef INET6
1710                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
1711 #else
1712                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
1713 #endif
1714                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
1715                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
1716                 /* Set the len */
1717                 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_paramhdr);
1718                 ph = mtod(op_err, struct sctp_paramhdr *);
1719                 ph->param_type = htons(SCTP_CAUSE_NAT_COLLIDING_STATE);
1720                 ph->param_length = htons(sizeof(struct sctp_paramhdr));
1721                 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err,
1722                     use_mflowid, mflowid,
1723                     vrf_id, port);
1724                 return (NULL);
1725         }
1726         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1727             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1728             (asoc->peer_vtag == 0))) {
1729                 /*
1730                  * case B in Section 5.2.4 Table 2: MXAA or MOAA my info
1731                  * should be ok, re-accept peer info
1732                  */
1733                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1734                         /*
1735                          * Extension of case C. If we hit this, then the
1736                          * random number generator returned the same vtag
1737                          * when we first sent our INIT-ACK and when we later
1738                          * sent our INIT. The side with the seq numbers that
1739                          * are different will be the one that normnally
1740                          * would have hit case C. This in effect "extends"
1741                          * our vtags in this collision case to be 64 bits.
1742                          * The same collision could occur aka you get both
1743                          * vtag and seq number the same twice in a row.. but
1744                          * is much less likely. If it did happen then we
1745                          * would proceed through and bring up the assoc.. we
1746                          * may end up with the wrong stream setup however..
1747                          * which would be bad.. but there is no way to
1748                          * tell.. until we send on a stream that does not
1749                          * exist :-)
1750                          */
1751                         if (how_indx < sizeof(asoc->cookie_how))
1752                                 asoc->cookie_how[how_indx] = 7;
1753
1754                         return (NULL);
1755                 }
1756                 if (how_indx < sizeof(asoc->cookie_how))
1757                         asoc->cookie_how[how_indx] = 8;
1758                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_14);
1759                 sctp_stop_all_cookie_timers(stcb);
1760                 /*
1761                  * since we did not send a HB make sure we don't double
1762                  * things
1763                  */
1764                 net->hb_responded = 1;
1765                 if (stcb->asoc.sctp_autoclose_ticks &&
1766                     sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
1767                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb,
1768                             NULL);
1769                 }
1770                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1771                 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
1772
1773                 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) {
1774                         /*
1775                          * Ok the peer probably discarded our data (if we
1776                          * echoed a cookie+data). So anything on the
1777                          * sent_queue should be marked for retransmit, we
1778                          * may not get something to kick us so it COULD
1779                          * still take a timeout to move these.. but it can't
1780                          * hurt to mark them.
1781                          */
1782                         struct sctp_tmit_chunk *chk;
1783
1784                         TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
1785                                 if (chk->sent < SCTP_DATAGRAM_RESEND) {
1786                                         chk->sent = SCTP_DATAGRAM_RESEND;
1787                                         sctp_flight_size_decrease(chk);
1788                                         sctp_total_flight_decrease(stcb, chk);
1789                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1790                                         spec_flag++;
1791                                 }
1792                         }
1793
1794                 }
1795                 /* process the INIT info (peer's info) */
1796                 retval = sctp_process_init(init_cp, stcb);
1797                 if (retval < 0) {
1798                         if (how_indx < sizeof(asoc->cookie_how))
1799                                 asoc->cookie_how[how_indx] = 9;
1800                         return (NULL);
1801                 }
1802                 if (sctp_load_addresses_from_init(stcb, m,
1803                     init_offset + sizeof(struct sctp_init_chunk),
1804                     initack_offset, src, dst, init_src)) {
1805                         if (how_indx < sizeof(asoc->cookie_how))
1806                                 asoc->cookie_how[how_indx] = 10;
1807                         return (NULL);
1808                 }
1809                 if ((asoc->state & SCTP_STATE_COOKIE_WAIT) ||
1810                     (asoc->state & SCTP_STATE_COOKIE_ECHOED)) {
1811                         *notification = SCTP_NOTIFY_ASSOC_UP;
1812
1813                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1814                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1815                             (inp->sctp_socket->so_qlimit == 0)) {
1816 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1817                                 struct socket *so;
1818
1819 #endif
1820                                 stcb->sctp_ep->sctp_flags |=
1821                                     SCTP_PCB_FLAGS_CONNECTED;
1822 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1823                                 so = SCTP_INP_SO(stcb->sctp_ep);
1824                                 atomic_add_int(&stcb->asoc.refcnt, 1);
1825                                 SCTP_TCB_UNLOCK(stcb);
1826                                 SCTP_SOCKET_LOCK(so, 1);
1827                                 SCTP_TCB_LOCK(stcb);
1828                                 atomic_add_int(&stcb->asoc.refcnt, -1);
1829                                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1830                                         SCTP_SOCKET_UNLOCK(so, 1);
1831                                         return (NULL);
1832                                 }
1833 #endif
1834                                 soisconnected(stcb->sctp_socket);
1835 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1836                                 SCTP_SOCKET_UNLOCK(so, 1);
1837 #endif
1838                         }
1839                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)
1840                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1841                         else
1842                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1843                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1844                 } else if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
1845                         SCTP_STAT_INCR_COUNTER32(sctps_restartestab);
1846                 } else {
1847                         SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1848                 }
1849                 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1850                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1851                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1852                             stcb->sctp_ep, stcb, asoc->primary_destination);
1853                 }
1854                 sctp_stop_all_cookie_timers(stcb);
1855                 sctp_toss_old_cookies(stcb, asoc);
1856                 sctp_send_cookie_ack(stcb);
1857                 if (spec_flag) {
1858                         /*
1859                          * only if we have retrans set do we do this. What
1860                          * this call does is get only the COOKIE-ACK out and
1861                          * then when we return the normal call to
1862                          * sctp_chunk_output will get the retrans out behind
1863                          * this.
1864                          */
1865                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED);
1866                 }
1867                 if (how_indx < sizeof(asoc->cookie_how))
1868                         asoc->cookie_how[how_indx] = 11;
1869
1870                 return (stcb);
1871         }
1872         if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1873             ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) &&
1874             cookie->tie_tag_my_vtag == asoc->my_vtag_nonce &&
1875             cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce &&
1876             cookie->tie_tag_peer_vtag != 0) {
1877                 struct sctpasochead *head;
1878
1879 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1880                 struct socket *so;
1881
1882 #endif
1883
1884                 if (asoc->peer_supports_nat) {
1885                         /*
1886                          * This is a gross gross hack. Just call the
1887                          * cookie_new code since we are allowing a duplicate
1888                          * association. I hope this works...
1889                          */
1890                         return (sctp_process_cookie_new(m, iphlen, offset, src, dst,
1891                             sh, cookie, cookie_len,
1892                             inp, netp, init_src, notification,
1893                             auth_skipped, auth_offset, auth_len,
1894                             use_mflowid, mflowid,
1895                             vrf_id, port));
1896                 }
1897                 /*
1898                  * case A in Section 5.2.4 Table 2: XXMM (peer restarted)
1899                  */
1900                 /* temp code */
1901                 if (how_indx < sizeof(asoc->cookie_how))
1902                         asoc->cookie_how[how_indx] = 12;
1903                 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_15);
1904                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
1905
1906                 /* notify upper layer */
1907                 *notification = SCTP_NOTIFY_ASSOC_RESTART;
1908                 atomic_add_int(&stcb->asoc.refcnt, 1);
1909                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_OPEN) &&
1910                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
1911                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) {
1912                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1913                 }
1914                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
1915                         SCTP_STAT_INCR_GAUGE32(sctps_restartestab);
1916                 } else if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) {
1917                         SCTP_STAT_INCR_GAUGE32(sctps_collisionestab);
1918                 }
1919                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1920                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1921                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1922                             stcb->sctp_ep, stcb, asoc->primary_destination);
1923
1924                 } else if (!(asoc->state & SCTP_STATE_SHUTDOWN_SENT)) {
1925                         /* move to OPEN state, if not in SHUTDOWN_SENT */
1926                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1927                 }
1928                 asoc->pre_open_streams =
1929                     ntohs(initack_cp->init.num_outbound_streams);
1930                 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
1931                 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
1932                 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
1933
1934                 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
1935
1936                 asoc->str_reset_seq_in = asoc->init_seq_number;
1937
1938                 asoc->advanced_peer_ack_point = asoc->last_acked_seq;
1939                 if (asoc->mapping_array) {
1940                         memset(asoc->mapping_array, 0,
1941                             asoc->mapping_array_size);
1942                 }
1943                 if (asoc->nr_mapping_array) {
1944                         memset(asoc->nr_mapping_array, 0,
1945                             asoc->mapping_array_size);
1946                 }
1947                 SCTP_TCB_UNLOCK(stcb);
1948 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1949                 so = SCTP_INP_SO(stcb->sctp_ep);
1950                 SCTP_SOCKET_LOCK(so, 1);
1951 #endif
1952                 SCTP_INP_INFO_WLOCK();
1953                 SCTP_INP_WLOCK(stcb->sctp_ep);
1954                 SCTP_TCB_LOCK(stcb);
1955                 atomic_add_int(&stcb->asoc.refcnt, -1);
1956                 /* send up all the data */
1957                 SCTP_TCB_SEND_LOCK(stcb);
1958
1959                 sctp_report_all_outbound(stcb, 0, 1, SCTP_SO_LOCKED);
1960                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
1961                         stcb->asoc.strmout[i].chunks_on_queues = 0;
1962                         stcb->asoc.strmout[i].stream_no = i;
1963                         stcb->asoc.strmout[i].next_sequence_send = 0;
1964                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
1965                 }
1966                 /* process the INIT-ACK info (my info) */
1967                 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
1968                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1969
1970                 /* pull from vtag hash */
1971                 LIST_REMOVE(stcb, sctp_asocs);
1972                 /* re-insert to new vtag position */
1973                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag,
1974                     SCTP_BASE_INFO(hashasocmark))];
1975                 /*
1976                  * put it in the bucket in the vtag hash of assoc's for the
1977                  * system
1978                  */
1979                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
1980
1981                 SCTP_TCB_SEND_UNLOCK(stcb);
1982                 SCTP_INP_WUNLOCK(stcb->sctp_ep);
1983                 SCTP_INP_INFO_WUNLOCK();
1984 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1985                 SCTP_SOCKET_UNLOCK(so, 1);
1986 #endif
1987                 asoc->total_flight = 0;
1988                 asoc->total_flight_count = 0;
1989                 /* process the INIT info (peer's info) */
1990                 retval = sctp_process_init(init_cp, stcb);
1991                 if (retval < 0) {
1992                         if (how_indx < sizeof(asoc->cookie_how))
1993                                 asoc->cookie_how[how_indx] = 13;
1994
1995                         return (NULL);
1996                 }
1997                 /*
1998                  * since we did not send a HB make sure we don't double
1999                  * things
2000                  */
2001                 net->hb_responded = 1;
2002
2003                 if (sctp_load_addresses_from_init(stcb, m,
2004                     init_offset + sizeof(struct sctp_init_chunk),
2005                     initack_offset, src, dst, init_src)) {
2006                         if (how_indx < sizeof(asoc->cookie_how))
2007                                 asoc->cookie_how[how_indx] = 14;
2008
2009                         return (NULL);
2010                 }
2011                 /* respond with a COOKIE-ACK */
2012                 sctp_stop_all_cookie_timers(stcb);
2013                 sctp_toss_old_cookies(stcb, asoc);
2014                 sctp_send_cookie_ack(stcb);
2015                 if (how_indx < sizeof(asoc->cookie_how))
2016                         asoc->cookie_how[how_indx] = 15;
2017
2018                 return (stcb);
2019         }
2020         if (how_indx < sizeof(asoc->cookie_how))
2021                 asoc->cookie_how[how_indx] = 16;
2022         /* all other cases... */
2023         return (NULL);
2024 }
2025
2026
2027 /*
2028  * handle a state cookie for a new association m: input packet mbuf chain--
2029  * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf
2030  * and the cookie signature does not exist offset: offset into mbuf to the
2031  * cookie-echo chunk length: length of the cookie chunk to: where the init
2032  * was from returns a new TCB
2033  */
2034 static struct sctp_tcb *
2035 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
2036     struct sockaddr *src, struct sockaddr *dst,
2037     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
2038     struct sctp_inpcb *inp, struct sctp_nets **netp,
2039     struct sockaddr *init_src, int *notification,
2040     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
2041     uint8_t use_mflowid, uint32_t mflowid,
2042     uint32_t vrf_id, uint16_t port)
2043 {
2044         struct sctp_tcb *stcb;
2045         struct sctp_init_chunk *init_cp, init_buf;
2046         struct sctp_init_ack_chunk *initack_cp, initack_buf;
2047         struct sockaddr_storage sa_store;
2048         struct sockaddr *initack_src = (struct sockaddr *)&sa_store;
2049         struct sctp_association *asoc;
2050         int init_offset, initack_offset, initack_limit;
2051         int retval;
2052         int error = 0;
2053         uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE];
2054
2055 #ifdef INET
2056         struct sockaddr_in *sin;
2057
2058 #endif
2059 #ifdef INET6
2060         struct sockaddr_in6 *sin6;
2061
2062 #endif
2063 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2064         struct socket *so;
2065
2066         so = SCTP_INP_SO(inp);
2067 #endif
2068
2069         /*
2070          * find and validate the INIT chunk in the cookie (peer's info) the
2071          * INIT should start after the cookie-echo header struct (chunk
2072          * header, state cookie header struct)
2073          */
2074         init_offset = offset + sizeof(struct sctp_cookie_echo_chunk);
2075         init_cp = (struct sctp_init_chunk *)
2076             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
2077             (uint8_t *) & init_buf);
2078         if (init_cp == NULL) {
2079                 /* could not pull a INIT chunk in cookie */
2080                 SCTPDBG(SCTP_DEBUG_INPUT1,
2081                     "process_cookie_new: could not pull INIT chunk hdr\n");
2082                 return (NULL);
2083         }
2084         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
2085                 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n");
2086                 return (NULL);
2087         }
2088         initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
2089         /*
2090          * find and validate the INIT-ACK chunk in the cookie (my info) the
2091          * INIT-ACK follows the INIT chunk
2092          */
2093         initack_cp = (struct sctp_init_ack_chunk *)
2094             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
2095             (uint8_t *) & initack_buf);
2096         if (initack_cp == NULL) {
2097                 /* could not pull INIT-ACK chunk in cookie */
2098                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n");
2099                 return (NULL);
2100         }
2101         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
2102                 return (NULL);
2103         }
2104         /*
2105          * NOTE: We can't use the INIT_ACK's chk_length to determine the
2106          * "initack_limit" value.  This is because the chk_length field
2107          * includes the length of the cookie, but the cookie is omitted when
2108          * the INIT and INIT_ACK are tacked onto the cookie...
2109          */
2110         initack_limit = offset + cookie_len;
2111
2112         /*
2113          * now that we know the INIT/INIT-ACK are in place, create a new TCB
2114          * and popluate
2115          */
2116
2117         /*
2118          * Here we do a trick, we set in NULL for the proc/thread argument.
2119          * We do this since in effect we only use the p argument when the
2120          * socket is unbound and we must do an implicit bind. Since we are
2121          * getting a cookie, we cannot be unbound.
2122          */
2123         stcb = sctp_aloc_assoc(inp, init_src, &error,
2124             ntohl(initack_cp->init.initiate_tag), vrf_id,
2125             (struct thread *)NULL
2126             );
2127         if (stcb == NULL) {
2128                 struct mbuf *op_err;
2129
2130                 /* memory problem? */
2131                 SCTPDBG(SCTP_DEBUG_INPUT1,
2132                     "process_cookie_new: no room for another TCB!\n");
2133                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC);
2134
2135                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2136                     src, dst, sh, op_err,
2137                     use_mflowid, mflowid,
2138                     vrf_id, port);
2139                 return (NULL);
2140         }
2141         /* get the correct sctp_nets */
2142         if (netp)
2143                 *netp = sctp_findnet(stcb, init_src);
2144
2145         asoc = &stcb->asoc;
2146         /* get scope variables out of cookie */
2147         asoc->scope.ipv4_local_scope = cookie->ipv4_scope;
2148         asoc->scope.site_scope = cookie->site_scope;
2149         asoc->scope.local_scope = cookie->local_scope;
2150         asoc->scope.loopback_scope = cookie->loopback_scope;
2151
2152         if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) ||
2153             (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) {
2154                 struct mbuf *op_err;
2155
2156                 /*
2157                  * Houston we have a problem. The EP changed while the
2158                  * cookie was in flight. Only recourse is to abort the
2159                  * association.
2160                  */
2161                 atomic_add_int(&stcb->asoc.refcnt, 1);
2162                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC);
2163                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2164                     src, dst, sh, op_err,
2165                     use_mflowid, mflowid,
2166                     vrf_id, port);
2167 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2168                 SCTP_TCB_UNLOCK(stcb);
2169                 SCTP_SOCKET_LOCK(so, 1);
2170                 SCTP_TCB_LOCK(stcb);
2171 #endif
2172                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2173                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
2174 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2175                 SCTP_SOCKET_UNLOCK(so, 1);
2176 #endif
2177                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2178                 return (NULL);
2179         }
2180         /* process the INIT-ACK info (my info) */
2181         asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
2182         asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
2183         asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
2184         asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
2185         asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
2186         asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
2187         asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
2188         asoc->str_reset_seq_in = asoc->init_seq_number;
2189
2190         asoc->advanced_peer_ack_point = asoc->last_acked_seq;
2191
2192         /* process the INIT info (peer's info) */
2193         if (netp)
2194                 retval = sctp_process_init(init_cp, stcb);
2195         else
2196                 retval = 0;
2197         if (retval < 0) {
2198                 atomic_add_int(&stcb->asoc.refcnt, 1);
2199 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2200                 SCTP_TCB_UNLOCK(stcb);
2201                 SCTP_SOCKET_LOCK(so, 1);
2202                 SCTP_TCB_LOCK(stcb);
2203 #endif
2204                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
2205 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2206                 SCTP_SOCKET_UNLOCK(so, 1);
2207 #endif
2208                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2209                 return (NULL);
2210         }
2211         /* load all addresses */
2212         if (sctp_load_addresses_from_init(stcb, m,
2213             init_offset + sizeof(struct sctp_init_chunk), initack_offset,
2214             src, dst, init_src)) {
2215                 atomic_add_int(&stcb->asoc.refcnt, 1);
2216 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2217                 SCTP_TCB_UNLOCK(stcb);
2218                 SCTP_SOCKET_LOCK(so, 1);
2219                 SCTP_TCB_LOCK(stcb);
2220 #endif
2221                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_17);
2222 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2223                 SCTP_SOCKET_UNLOCK(so, 1);
2224 #endif
2225                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2226                 return (NULL);
2227         }
2228         /*
2229          * verify any preceding AUTH chunk that was skipped
2230          */
2231         /* pull the local authentication parameters from the cookie/init-ack */
2232         sctp_auth_get_cookie_params(stcb, m,
2233             initack_offset + sizeof(struct sctp_init_ack_chunk),
2234             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)));
2235         if (auth_skipped) {
2236                 struct sctp_auth_chunk *auth;
2237
2238                 auth = (struct sctp_auth_chunk *)
2239                     sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf);
2240                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) {
2241                         /* auth HMAC failed, dump the assoc and packet */
2242                         SCTPDBG(SCTP_DEBUG_AUTH1,
2243                             "COOKIE-ECHO: AUTH failed\n");
2244                         atomic_add_int(&stcb->asoc.refcnt, 1);
2245 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2246                         SCTP_TCB_UNLOCK(stcb);
2247                         SCTP_SOCKET_LOCK(so, 1);
2248                         SCTP_TCB_LOCK(stcb);
2249 #endif
2250                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_18);
2251 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2252                         SCTP_SOCKET_UNLOCK(so, 1);
2253 #endif
2254                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
2255                         return (NULL);
2256                 } else {
2257                         /* remaining chunks checked... good to go */
2258                         stcb->asoc.authenticated = 1;
2259                 }
2260         }
2261         /* update current state */
2262         SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2263         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
2264         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2265                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2266                     stcb->sctp_ep, stcb, asoc->primary_destination);
2267         }
2268         sctp_stop_all_cookie_timers(stcb);
2269         SCTP_STAT_INCR_COUNTER32(sctps_passiveestab);
2270         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2271
2272         /*
2273          * if we're doing ASCONFs, check to see if we have any new local
2274          * addresses that need to get added to the peer (eg. addresses
2275          * changed while cookie echo in flight).  This needs to be done
2276          * after we go to the OPEN state to do the correct asconf
2277          * processing. else, make sure we have the correct addresses in our
2278          * lists
2279          */
2280
2281         /* warning, we re-use sin, sin6, sa_store here! */
2282         /* pull in local_address (our "from" address) */
2283         switch (cookie->laddr_type) {
2284 #ifdef INET
2285         case SCTP_IPV4_ADDRESS:
2286                 /* source addr is IPv4 */
2287                 sin = (struct sockaddr_in *)initack_src;
2288                 memset(sin, 0, sizeof(*sin));
2289                 sin->sin_family = AF_INET;
2290                 sin->sin_len = sizeof(struct sockaddr_in);
2291                 sin->sin_addr.s_addr = cookie->laddress[0];
2292                 break;
2293 #endif
2294 #ifdef INET6
2295         case SCTP_IPV6_ADDRESS:
2296                 /* source addr is IPv6 */
2297                 sin6 = (struct sockaddr_in6 *)initack_src;
2298                 memset(sin6, 0, sizeof(*sin6));
2299                 sin6->sin6_family = AF_INET6;
2300                 sin6->sin6_len = sizeof(struct sockaddr_in6);
2301                 sin6->sin6_scope_id = cookie->scope_id;
2302                 memcpy(&sin6->sin6_addr, cookie->laddress,
2303                     sizeof(sin6->sin6_addr));
2304                 break;
2305 #endif
2306         default:
2307                 atomic_add_int(&stcb->asoc.refcnt, 1);
2308 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2309                 SCTP_TCB_UNLOCK(stcb);
2310                 SCTP_SOCKET_LOCK(so, 1);
2311                 SCTP_TCB_LOCK(stcb);
2312 #endif
2313                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_19);
2314 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2315                 SCTP_SOCKET_UNLOCK(so, 1);
2316 #endif
2317                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2318                 return (NULL);
2319         }
2320
2321         /* set up to notify upper layer */
2322         *notification = SCTP_NOTIFY_ASSOC_UP;
2323         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2324             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
2325             (inp->sctp_socket->so_qlimit == 0)) {
2326                 /*
2327                  * This is an endpoint that called connect() how it got a
2328                  * cookie that is NEW is a bit of a mystery. It must be that
2329                  * the INIT was sent, but before it got there.. a complete
2330                  * INIT/INIT-ACK/COOKIE arrived. But of course then it
2331                  * should have went to the other code.. not here.. oh well..
2332                  * a bit of protection is worth having..
2333                  */
2334                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2335 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2336                 atomic_add_int(&stcb->asoc.refcnt, 1);
2337                 SCTP_TCB_UNLOCK(stcb);
2338                 SCTP_SOCKET_LOCK(so, 1);
2339                 SCTP_TCB_LOCK(stcb);
2340                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2341                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
2342                         SCTP_SOCKET_UNLOCK(so, 1);
2343                         return (NULL);
2344                 }
2345 #endif
2346                 soisconnected(stcb->sctp_socket);
2347 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2348                 SCTP_SOCKET_UNLOCK(so, 1);
2349 #endif
2350         } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
2351             (inp->sctp_socket->so_qlimit)) {
2352                 /*
2353                  * We don't want to do anything with this one. Since it is
2354                  * the listening guy. The timer will get started for
2355                  * accepted connections in the caller.
2356                  */
2357                 ;
2358         }
2359         /* since we did not send a HB make sure we don't double things */
2360         if ((netp) && (*netp))
2361                 (*netp)->hb_responded = 1;
2362
2363         if (stcb->asoc.sctp_autoclose_ticks &&
2364             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2365                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL);
2366         }
2367         /* calculate the RTT */
2368         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
2369         if ((netp) && (*netp)) {
2370                 (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp,
2371                     &cookie->time_entered, sctp_align_unsafe_makecopy,
2372                     SCTP_RTT_FROM_NON_DATA);
2373         }
2374         /* respond with a COOKIE-ACK */
2375         sctp_send_cookie_ack(stcb);
2376
2377         /*
2378          * check the address lists for any ASCONFs that need to be sent
2379          * AFTER the cookie-ack is sent
2380          */
2381         sctp_check_address_list(stcb, m,
2382             initack_offset + sizeof(struct sctp_init_ack_chunk),
2383             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)),
2384             initack_src, cookie->local_scope, cookie->site_scope,
2385             cookie->ipv4_scope, cookie->loopback_scope);
2386
2387
2388         return (stcb);
2389 }
2390
2391 /*
2392  * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e
2393  * we NEED to make sure we are not already using the vtag. If so we
2394  * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit!
2395         head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag,
2396                                                             SCTP_BASE_INFO(hashasocmark))];
2397         LIST_FOREACH(stcb, head, sctp_asocs) {
2398                 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep))  {
2399                        -- SEND ABORT - TRY AGAIN --
2400                 }
2401         }
2402 */
2403
2404 /*
2405  * handles a COOKIE-ECHO message stcb: modified to either a new or left as
2406  * existing (non-NULL) TCB
2407  */
2408 static struct mbuf *
2409 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset,
2410     struct sockaddr *src, struct sockaddr *dst,
2411     struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp,
2412     struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp,
2413     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
2414     struct sctp_tcb **locked_tcb,
2415     uint8_t use_mflowid, uint32_t mflowid,
2416     uint32_t vrf_id, uint16_t port)
2417 {
2418         struct sctp_state_cookie *cookie;
2419         struct sctp_tcb *l_stcb = *stcb;
2420         struct sctp_inpcb *l_inp;
2421         struct sockaddr *to;
2422         struct sctp_pcb *ep;
2423         struct mbuf *m_sig;
2424         uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE];
2425         uint8_t *sig;
2426         uint8_t cookie_ok = 0;
2427         unsigned int sig_offset, cookie_offset;
2428         unsigned int cookie_len;
2429         struct timeval now;
2430         struct timeval time_expires;
2431         int notification = 0;
2432         struct sctp_nets *netl;
2433         int had_a_existing_tcb = 0;
2434         int send_int_conf = 0;
2435
2436 #ifdef INET
2437         struct sockaddr_in sin;
2438
2439 #endif
2440 #ifdef INET6
2441         struct sockaddr_in6 sin6;
2442
2443 #endif
2444
2445         SCTPDBG(SCTP_DEBUG_INPUT2,
2446             "sctp_handle_cookie: handling COOKIE-ECHO\n");
2447
2448         if (inp_p == NULL) {
2449                 return (NULL);
2450         }
2451         cookie = &cp->cookie;
2452         cookie_offset = offset + sizeof(struct sctp_chunkhdr);
2453         cookie_len = ntohs(cp->ch.chunk_length);
2454
2455         if ((cookie->peerport != sh->src_port) &&
2456             (cookie->myport != sh->dest_port) &&
2457             (cookie->my_vtag != sh->v_tag)) {
2458                 /*
2459                  * invalid ports or bad tag.  Note that we always leave the
2460                  * v_tag in the header in network order and when we stored
2461                  * it in the my_vtag slot we also left it in network order.
2462                  * This maintains the match even though it may be in the
2463                  * opposite byte order of the machine :->
2464                  */
2465                 return (NULL);
2466         }
2467         if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) +
2468             sizeof(struct sctp_init_chunk) +
2469             sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) {
2470                 /* cookie too small */
2471                 return (NULL);
2472         }
2473         /*
2474          * split off the signature into its own mbuf (since it should not be
2475          * calculated in the sctp_hmac_m() call).
2476          */
2477         sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE;
2478         m_sig = m_split(m, sig_offset, M_DONTWAIT);
2479         if (m_sig == NULL) {
2480                 /* out of memory or ?? */
2481                 return (NULL);
2482         }
2483 #ifdef SCTP_MBUF_LOGGING
2484         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
2485                 struct mbuf *mat;
2486
2487                 for (mat = m_sig; mat; mat = SCTP_BUF_NEXT(mat)) {
2488                         if (SCTP_BUF_IS_EXTENDED(mat)) {
2489                                 sctp_log_mb(mat, SCTP_MBUF_SPLIT);
2490                         }
2491                 }
2492         }
2493 #endif
2494
2495         /*
2496          * compute the signature/digest for the cookie
2497          */
2498         ep = &(*inp_p)->sctp_ep;
2499         l_inp = *inp_p;
2500         if (l_stcb) {
2501                 SCTP_TCB_UNLOCK(l_stcb);
2502         }
2503         SCTP_INP_RLOCK(l_inp);
2504         if (l_stcb) {
2505                 SCTP_TCB_LOCK(l_stcb);
2506         }
2507         /* which cookie is it? */
2508         if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) &&
2509             (ep->current_secret_number != ep->last_secret_number)) {
2510                 /* it's the old cookie */
2511                 (void)sctp_hmac_m(SCTP_HMAC,
2512                     (uint8_t *) ep->secret_key[(int)ep->last_secret_number],
2513                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2514         } else {
2515                 /* it's the current cookie */
2516                 (void)sctp_hmac_m(SCTP_HMAC,
2517                     (uint8_t *) ep->secret_key[(int)ep->current_secret_number],
2518                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2519         }
2520         /* get the signature */
2521         SCTP_INP_RUNLOCK(l_inp);
2522         sig = (uint8_t *) sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *) & tmp_sig);
2523         if (sig == NULL) {
2524                 /* couldn't find signature */
2525                 sctp_m_freem(m_sig);
2526                 return (NULL);
2527         }
2528         /* compare the received digest with the computed digest */
2529         if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) {
2530                 /* try the old cookie? */
2531                 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) &&
2532                     (ep->current_secret_number != ep->last_secret_number)) {
2533                         /* compute digest with old */
2534                         (void)sctp_hmac_m(SCTP_HMAC,
2535                             (uint8_t *) ep->secret_key[(int)ep->last_secret_number],
2536                             SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2537                         /* compare */
2538                         if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0)
2539                                 cookie_ok = 1;
2540                 }
2541         } else {
2542                 cookie_ok = 1;
2543         }
2544
2545         /*
2546          * Now before we continue we must reconstruct our mbuf so that
2547          * normal processing of any other chunks will work.
2548          */
2549         {
2550                 struct mbuf *m_at;
2551
2552                 m_at = m;
2553                 while (SCTP_BUF_NEXT(m_at) != NULL) {
2554                         m_at = SCTP_BUF_NEXT(m_at);
2555                 }
2556                 SCTP_BUF_NEXT(m_at) = m_sig;
2557         }
2558
2559         if (cookie_ok == 0) {
2560                 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n");
2561                 SCTPDBG(SCTP_DEBUG_INPUT2,
2562                     "offset = %u, cookie_offset = %u, sig_offset = %u\n",
2563                     (uint32_t) offset, cookie_offset, sig_offset);
2564                 return (NULL);
2565         }
2566         /*
2567          * check the cookie timestamps to be sure it's not stale
2568          */
2569         (void)SCTP_GETTIME_TIMEVAL(&now);
2570         /* Expire time is in Ticks, so we convert to seconds */
2571         time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life);
2572         time_expires.tv_usec = cookie->time_entered.tv_usec;
2573         /*
2574          * TODO sctp_constants.h needs alternative time macros when _KERNEL
2575          * is undefined.
2576          */
2577         if (timevalcmp(&now, &time_expires, >)) {
2578                 /* cookie is stale! */
2579                 struct mbuf *op_err;
2580                 struct sctp_stale_cookie_msg *scm;
2581                 uint32_t tim;
2582
2583                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_stale_cookie_msg),
2584                     0, M_DONTWAIT, 1, MT_DATA);
2585                 if (op_err == NULL) {
2586                         /* FOOBAR */
2587                         return (NULL);
2588                 }
2589                 /* Set the len */
2590                 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_stale_cookie_msg);
2591                 scm = mtod(op_err, struct sctp_stale_cookie_msg *);
2592                 scm->ph.param_type = htons(SCTP_CAUSE_STALE_COOKIE);
2593                 scm->ph.param_length = htons((sizeof(struct sctp_paramhdr) +
2594                     (sizeof(uint32_t))));
2595                 /* seconds to usec */
2596                 tim = (now.tv_sec - time_expires.tv_sec) * 1000000;
2597                 /* add in usec */
2598                 if (tim == 0)
2599                         tim = now.tv_usec - cookie->time_entered.tv_usec;
2600                 scm->time_usec = htonl(tim);
2601                 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
2602                     use_mflowid, mflowid,
2603                     vrf_id, port);
2604                 return (NULL);
2605         }
2606         /*
2607          * Now we must see with the lookup address if we have an existing
2608          * asoc. This will only happen if we were in the COOKIE-WAIT state
2609          * and a INIT collided with us and somewhere the peer sent the
2610          * cookie on another address besides the single address our assoc
2611          * had for him. In this case we will have one of the tie-tags set at
2612          * least AND the address field in the cookie can be used to look it
2613          * up.
2614          */
2615         to = NULL;
2616         switch (cookie->addr_type) {
2617 #ifdef INET6
2618         case SCTP_IPV6_ADDRESS:
2619                 memset(&sin6, 0, sizeof(sin6));
2620                 sin6.sin6_family = AF_INET6;
2621                 sin6.sin6_len = sizeof(sin6);
2622                 sin6.sin6_port = sh->src_port;
2623                 sin6.sin6_scope_id = cookie->scope_id;
2624                 memcpy(&sin6.sin6_addr.s6_addr, cookie->address,
2625                     sizeof(sin6.sin6_addr.s6_addr));
2626                 to = (struct sockaddr *)&sin6;
2627                 break;
2628 #endif
2629 #ifdef INET
2630         case SCTP_IPV4_ADDRESS:
2631                 memset(&sin, 0, sizeof(sin));
2632                 sin.sin_family = AF_INET;
2633                 sin.sin_len = sizeof(sin);
2634                 sin.sin_port = sh->src_port;
2635                 sin.sin_addr.s_addr = cookie->address[0];
2636                 to = (struct sockaddr *)&sin;
2637                 break;
2638 #endif
2639         default:
2640                 /* This should not happen */
2641                 return (NULL);
2642         }
2643         if ((*stcb == NULL) && to) {
2644                 /* Yep, lets check */
2645                 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL);
2646                 if (*stcb == NULL) {
2647                         /*
2648                          * We should have only got back the same inp. If we
2649                          * got back a different ep we have a problem. The
2650                          * original findep got back l_inp and now
2651                          */
2652                         if (l_inp != *inp_p) {
2653                                 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n");
2654                         }
2655                 } else {
2656                         if (*locked_tcb == NULL) {
2657                                 /*
2658                                  * In this case we found the assoc only
2659                                  * after we locked the create lock. This
2660                                  * means we are in a colliding case and we
2661                                  * must make sure that we unlock the tcb if
2662                                  * its one of the cases where we throw away
2663                                  * the incoming packets.
2664                                  */
2665                                 *locked_tcb = *stcb;
2666
2667                                 /*
2668                                  * We must also increment the inp ref count
2669                                  * since the ref_count flags was set when we
2670                                  * did not find the TCB, now we found it
2671                                  * which reduces the refcount.. we must
2672                                  * raise it back out to balance it all :-)
2673                                  */
2674                                 SCTP_INP_INCR_REF((*stcb)->sctp_ep);
2675                                 if ((*stcb)->sctp_ep != l_inp) {
2676                                         SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n",
2677                                             (void *)(*stcb)->sctp_ep, (void *)l_inp);
2678                                 }
2679                         }
2680                 }
2681         }
2682         if (to == NULL) {
2683                 return (NULL);
2684         }
2685         cookie_len -= SCTP_SIGNATURE_SIZE;
2686         if (*stcb == NULL) {
2687                 /* this is the "normal" case... get a new TCB */
2688                 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh,
2689                     cookie, cookie_len, *inp_p,
2690                     netp, to, &notification,
2691                     auth_skipped, auth_offset, auth_len,
2692                     use_mflowid, mflowid,
2693                     vrf_id, port);
2694         } else {
2695                 /* this is abnormal... cookie-echo on existing TCB */
2696                 had_a_existing_tcb = 1;
2697                 *stcb = sctp_process_cookie_existing(m, iphlen, offset,
2698                     src, dst, sh,
2699                     cookie, cookie_len, *inp_p, *stcb, netp, to,
2700                     &notification, auth_skipped, auth_offset, auth_len,
2701                     use_mflowid, mflowid,
2702                     vrf_id, port);
2703         }
2704
2705         if (*stcb == NULL) {
2706                 /* still no TCB... must be bad cookie-echo */
2707                 return (NULL);
2708         }
2709         if ((*netp != NULL) && (use_mflowid != 0)) {
2710                 (*netp)->flowid = mflowid;
2711 #ifdef INVARIANTS
2712                 (*netp)->flowidset = 1;
2713 #endif
2714         }
2715         /*
2716          * Ok, we built an association so confirm the address we sent the
2717          * INIT-ACK to.
2718          */
2719         netl = sctp_findnet(*stcb, to);
2720         /*
2721          * This code should in theory NOT run but
2722          */
2723         if (netl == NULL) {
2724                 /* TSNH! Huh, why do I need to add this address here? */
2725                 if (sctp_add_remote_addr(*stcb, to, NULL, SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) {
2726                         return (NULL);
2727                 }
2728                 netl = sctp_findnet(*stcb, to);
2729         }
2730         if (netl) {
2731                 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) {
2732                         netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
2733                         (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL,
2734                             netl);
2735                         send_int_conf = 1;
2736                 }
2737         }
2738         sctp_start_net_timers(*stcb);
2739         if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
2740                 if (!had_a_existing_tcb ||
2741                     (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
2742                         /*
2743                          * If we have a NEW cookie or the connect never
2744                          * reached the connected state during collision we
2745                          * must do the TCP accept thing.
2746                          */
2747                         struct socket *so, *oso;
2748                         struct sctp_inpcb *inp;
2749
2750                         if (notification == SCTP_NOTIFY_ASSOC_RESTART) {
2751                                 /*
2752                                  * For a restart we will keep the same
2753                                  * socket, no need to do anything. I THINK!!
2754                                  */
2755                                 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2756                                 if (send_int_conf) {
2757                                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2758                                             (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2759                                 }
2760                                 return (m);
2761                         }
2762                         oso = (*inp_p)->sctp_socket;
2763                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2764                         SCTP_TCB_UNLOCK((*stcb));
2765                         CURVNET_SET(oso->so_vnet);
2766                         so = sonewconn(oso, 0
2767                             );
2768                         CURVNET_RESTORE();
2769                         SCTP_TCB_LOCK((*stcb));
2770                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2771
2772                         if (so == NULL) {
2773                                 struct mbuf *op_err;
2774
2775 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2776                                 struct socket *pcb_so;
2777
2778 #endif
2779                                 /* Too many sockets */
2780                                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n");
2781                                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC);
2782                                 sctp_abort_association(*inp_p, NULL, m, iphlen,
2783                                     src, dst, sh, op_err,
2784                                     use_mflowid, mflowid,
2785                                     vrf_id, port);
2786 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2787                                 pcb_so = SCTP_INP_SO(*inp_p);
2788                                 atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2789                                 SCTP_TCB_UNLOCK((*stcb));
2790                                 SCTP_SOCKET_LOCK(pcb_so, 1);
2791                                 SCTP_TCB_LOCK((*stcb));
2792                                 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2793 #endif
2794                                 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_20);
2795 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2796                                 SCTP_SOCKET_UNLOCK(pcb_so, 1);
2797 #endif
2798                                 return (NULL);
2799                         }
2800                         inp = (struct sctp_inpcb *)so->so_pcb;
2801                         SCTP_INP_INCR_REF(inp);
2802                         /*
2803                          * We add the unbound flag here so that if we get an
2804                          * soabort() before we get the move_pcb done, we
2805                          * will properly cleanup.
2806                          */
2807                         inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE |
2808                             SCTP_PCB_FLAGS_CONNECTED |
2809                             SCTP_PCB_FLAGS_IN_TCPPOOL |
2810                             SCTP_PCB_FLAGS_UNBOUND |
2811                             (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) |
2812                             SCTP_PCB_FLAGS_DONT_WAKE);
2813                         inp->sctp_features = (*inp_p)->sctp_features;
2814                         inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features;
2815                         inp->sctp_socket = so;
2816                         inp->sctp_frag_point = (*inp_p)->sctp_frag_point;
2817                         inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off;
2818                         inp->sctp_ecn_enable = (*inp_p)->sctp_ecn_enable;
2819                         inp->partial_delivery_point = (*inp_p)->partial_delivery_point;
2820                         inp->sctp_context = (*inp_p)->sctp_context;
2821                         inp->local_strreset_support = (*inp_p)->local_strreset_support;
2822                         inp->inp_starting_point_for_iterator = NULL;
2823                         /*
2824                          * copy in the authentication parameters from the
2825                          * original endpoint
2826                          */
2827                         if (inp->sctp_ep.local_hmacs)
2828                                 sctp_free_hmaclist(inp->sctp_ep.local_hmacs);
2829                         inp->sctp_ep.local_hmacs =
2830                             sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs);
2831                         if (inp->sctp_ep.local_auth_chunks)
2832                                 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks);
2833                         inp->sctp_ep.local_auth_chunks =
2834                             sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks);
2835
2836                         /*
2837                          * Now we must move it from one hash table to
2838                          * another and get the tcb in the right place.
2839                          */
2840
2841                         /*
2842                          * This is where the one-2-one socket is put into
2843                          * the accept state waiting for the accept!
2844                          */
2845                         if (*stcb) {
2846                                 (*stcb)->asoc.state |= SCTP_STATE_IN_ACCEPT_QUEUE;
2847                         }
2848                         sctp_move_pcb_and_assoc(*inp_p, inp, *stcb);
2849
2850                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2851                         SCTP_TCB_UNLOCK((*stcb));
2852
2853                         sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb,
2854                             0);
2855                         SCTP_TCB_LOCK((*stcb));
2856                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2857
2858
2859                         /*
2860                          * now we must check to see if we were aborted while
2861                          * the move was going on and the lock/unlock
2862                          * happened.
2863                          */
2864                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
2865                                 /*
2866                                  * yep it was, we leave the assoc attached
2867                                  * to the socket since the sctp_inpcb_free()
2868                                  * call will send an abort for us.
2869                                  */
2870                                 SCTP_INP_DECR_REF(inp);
2871                                 return (NULL);
2872                         }
2873                         SCTP_INP_DECR_REF(inp);
2874                         /* Switch over to the new guy */
2875                         *inp_p = inp;
2876                         sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2877                         if (send_int_conf) {
2878                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2879                                     (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2880                         }
2881                         /*
2882                          * Pull it from the incomplete queue and wake the
2883                          * guy
2884                          */
2885 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2886                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2887                         SCTP_TCB_UNLOCK((*stcb));
2888                         SCTP_SOCKET_LOCK(so, 1);
2889 #endif
2890                         soisconnected(so);
2891 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2892                         SCTP_TCB_LOCK((*stcb));
2893                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2894                         SCTP_SOCKET_UNLOCK(so, 1);
2895 #endif
2896                         return (m);
2897                 }
2898         }
2899         if (notification) {
2900                 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2901         }
2902         if (send_int_conf) {
2903                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2904                     (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2905         }
2906         return (m);
2907 }
2908
2909 static void
2910 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED,
2911     struct sctp_tcb *stcb, struct sctp_nets *net)
2912 {
2913         /* cp must not be used, others call this without a c-ack :-) */
2914         struct sctp_association *asoc;
2915
2916         SCTPDBG(SCTP_DEBUG_INPUT2,
2917             "sctp_handle_cookie_ack: handling COOKIE-ACK\n");
2918         if (stcb == NULL)
2919                 return;
2920
2921         asoc = &stcb->asoc;
2922
2923         sctp_stop_all_cookie_timers(stcb);
2924         /* process according to association state */
2925         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) {
2926                 /* state change only needed when I am in right state */
2927                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2928                 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
2929                 sctp_start_net_timers(stcb);
2930                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2931                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2932                             stcb->sctp_ep, stcb, asoc->primary_destination);
2933
2934                 }
2935                 /* update RTO */
2936                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
2937                 SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2938                 if (asoc->overall_error_count == 0) {
2939                         net->RTO = sctp_calculate_rto(stcb, asoc, net,
2940                             &asoc->time_entered, sctp_align_safe_nocopy,
2941                             SCTP_RTT_FROM_NON_DATA);
2942                 }
2943                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
2944                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2945                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2946                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
2947 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2948                         struct socket *so;
2949
2950 #endif
2951                         stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2952 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2953                         so = SCTP_INP_SO(stcb->sctp_ep);
2954                         atomic_add_int(&stcb->asoc.refcnt, 1);
2955                         SCTP_TCB_UNLOCK(stcb);
2956                         SCTP_SOCKET_LOCK(so, 1);
2957                         SCTP_TCB_LOCK(stcb);
2958                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
2959 #endif
2960                         if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) {
2961                                 soisconnected(stcb->sctp_socket);
2962                         }
2963 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2964                         SCTP_SOCKET_UNLOCK(so, 1);
2965 #endif
2966                 }
2967                 /*
2968                  * since we did not send a HB make sure we don't double
2969                  * things
2970                  */
2971                 net->hb_responded = 1;
2972
2973                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
2974                         /*
2975                          * We don't need to do the asconf thing, nor hb or
2976                          * autoclose if the socket is closed.
2977                          */
2978                         goto closed_socket;
2979                 }
2980                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
2981                     stcb, net);
2982
2983
2984                 if (stcb->asoc.sctp_autoclose_ticks &&
2985                     sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2986                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
2987                             stcb->sctp_ep, stcb, NULL);
2988                 }
2989                 /*
2990                  * send ASCONF if parameters are pending and ASCONFs are
2991                  * allowed (eg. addresses changed when init/cookie echo were
2992                  * in flight)
2993                  */
2994                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) &&
2995                     (stcb->asoc.peer_supports_asconf) &&
2996                     (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) {
2997 #ifdef SCTP_TIMER_BASED_ASCONF
2998                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF,
2999                             stcb->sctp_ep, stcb,
3000                             stcb->asoc.primary_destination);
3001 #else
3002                         sctp_send_asconf(stcb, stcb->asoc.primary_destination,
3003                             SCTP_ADDR_NOT_LOCKED);
3004 #endif
3005                 }
3006         }
3007 closed_socket:
3008         /* Toss the cookie if I can */
3009         sctp_toss_old_cookies(stcb, asoc);
3010         if (!TAILQ_EMPTY(&asoc->sent_queue)) {
3011                 /* Restart the timer if we have pending data */
3012                 struct sctp_tmit_chunk *chk;
3013
3014                 chk = TAILQ_FIRST(&asoc->sent_queue);
3015                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
3016         }
3017 }
3018
3019 static void
3020 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp,
3021     struct sctp_tcb *stcb)
3022 {
3023         struct sctp_nets *net;
3024         struct sctp_tmit_chunk *lchk;
3025         struct sctp_ecne_chunk bkup;
3026         uint8_t override_bit;
3027         uint32_t tsn, window_data_tsn;
3028         int len;
3029         unsigned int pkt_cnt;
3030
3031         len = ntohs(cp->ch.chunk_length);
3032         if ((len != sizeof(struct sctp_ecne_chunk)) &&
3033             (len != sizeof(struct old_sctp_ecne_chunk))) {
3034                 return;
3035         }
3036         if (len == sizeof(struct old_sctp_ecne_chunk)) {
3037                 /* Its the old format */
3038                 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk));
3039                 bkup.num_pkts_since_cwr = htonl(1);
3040                 cp = &bkup;
3041         }
3042         SCTP_STAT_INCR(sctps_recvecne);
3043         tsn = ntohl(cp->tsn);
3044         pkt_cnt = ntohl(cp->num_pkts_since_cwr);
3045         lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead);
3046         if (lchk == NULL) {
3047                 window_data_tsn = stcb->asoc.sending_seq - 1;
3048         } else {
3049                 window_data_tsn = lchk->rec.data.TSN_seq;
3050         }
3051
3052         /* Find where it was sent to if possible. */
3053         net = NULL;
3054         TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) {
3055                 if (lchk->rec.data.TSN_seq == tsn) {
3056                         net = lchk->whoTo;
3057                         net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send;
3058                         break;
3059                 }
3060                 if (SCTP_TSN_GT(lchk->rec.data.TSN_seq, tsn)) {
3061                         break;
3062                 }
3063         }
3064         if (net == NULL) {
3065                 /*
3066                  * What to do. A previous send of a CWR was possibly lost.
3067                  * See how old it is, we may have it marked on the actual
3068                  * net.
3069                  */
3070                 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
3071                         if (tsn == net->last_cwr_tsn) {
3072                                 /* Found him, send it off */
3073                                 break;
3074                         }
3075                 }
3076                 if (net == NULL) {
3077                         /*
3078                          * If we reach here, we need to send a special CWR
3079                          * that says hey, we did this a long time ago and
3080                          * you lost the response.
3081                          */
3082                         net = TAILQ_FIRST(&stcb->asoc.nets);
3083                         if (net == NULL) {
3084                                 /* TSNH */
3085                                 return;
3086                         }
3087                         override_bit = SCTP_CWR_REDUCE_OVERRIDE;
3088                 } else {
3089                         override_bit = 0;
3090                 }
3091         } else {
3092                 override_bit = 0;
3093         }
3094         if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) &&
3095             ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
3096                 /*
3097                  * JRS - Use the congestion control given in the pluggable
3098                  * CC module
3099                  */
3100                 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt);
3101                 /*
3102                  * We reduce once every RTT. So we will only lower cwnd at
3103                  * the next sending seq i.e. the window_data_tsn
3104                  */
3105                 net->cwr_window_tsn = window_data_tsn;
3106                 net->ecn_ce_pkt_cnt += pkt_cnt;
3107                 net->lost_cnt = pkt_cnt;
3108                 net->last_cwr_tsn = tsn;
3109         } else {
3110                 override_bit |= SCTP_CWR_IN_SAME_WINDOW;
3111                 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) &&
3112                     ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
3113                         /*
3114                          * Another loss in the same window update how many
3115                          * marks/packets lost we have had.
3116                          */
3117                         int cnt = 1;
3118
3119                         if (pkt_cnt > net->lost_cnt) {
3120                                 /* Should be the case */
3121                                 cnt = (pkt_cnt - net->lost_cnt);
3122                                 net->ecn_ce_pkt_cnt += cnt;
3123                         }
3124                         net->lost_cnt = pkt_cnt;
3125                         net->last_cwr_tsn = tsn;
3126                         /*
3127                          * Most CC functions will ignore this call, since we
3128                          * are in-window yet of the initial CE the peer saw.
3129                          */
3130                         stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt);
3131                 }
3132         }
3133         /*
3134          * We always send a CWR this way if our previous one was lost our
3135          * peer will get an update, or if it is not time again to reduce we
3136          * still get the cwr to the peer. Note we set the override when we
3137          * could not find the TSN on the chunk or the destination network.
3138          */
3139         sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit);
3140 }
3141
3142 static void
3143 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net)
3144 {
3145         /*
3146          * Here we get a CWR from the peer. We must look in the outqueue and
3147          * make sure that we have a covered ECNE in the control chunk part.
3148          * If so remove it.
3149          */
3150         struct sctp_tmit_chunk *chk;
3151         struct sctp_ecne_chunk *ecne;
3152         int override;
3153         uint32_t cwr_tsn;
3154
3155         cwr_tsn = ntohl(cp->tsn);
3156
3157         override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE;
3158         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
3159                 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) {
3160                         continue;
3161                 }
3162                 if ((override == 0) && (chk->whoTo != net)) {
3163                         /* Must be from the right src unless override is set */
3164                         continue;
3165                 }
3166                 ecne = mtod(chk->data, struct sctp_ecne_chunk *);
3167                 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) {
3168                         /* this covers this ECNE, we can remove it */
3169                         stcb->asoc.ecn_echo_cnt_onq--;
3170                         TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk,
3171                             sctp_next);
3172                         if (chk->data) {
3173                                 sctp_m_freem(chk->data);
3174                                 chk->data = NULL;
3175                         }
3176                         stcb->asoc.ctrl_queue_cnt--;
3177                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3178                         if (override == 0) {
3179                                 break;
3180                         }
3181                 }
3182         }
3183 }
3184
3185 static void
3186 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED,
3187     struct sctp_tcb *stcb, struct sctp_nets *net)
3188 {
3189         struct sctp_association *asoc;
3190
3191 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3192         struct socket *so;
3193
3194 #endif
3195
3196         SCTPDBG(SCTP_DEBUG_INPUT2,
3197             "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n");
3198         if (stcb == NULL)
3199                 return;
3200
3201         asoc = &stcb->asoc;
3202         /* process according to association state */
3203         if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
3204                 /* unexpected SHUTDOWN-COMPLETE... so ignore... */
3205                 SCTPDBG(SCTP_DEBUG_INPUT2,
3206                     "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n");
3207                 SCTP_TCB_UNLOCK(stcb);
3208                 return;
3209         }
3210         /* notify upper layer protocol */
3211         if (stcb->sctp_socket) {
3212                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
3213         }
3214 #ifdef INVARIANTS
3215         if (!TAILQ_EMPTY(&asoc->send_queue) ||
3216             !TAILQ_EMPTY(&asoc->sent_queue) ||
3217             !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
3218                 panic("Queues are not empty when handling SHUTDOWN-COMPLETE");
3219         }
3220 #endif
3221         /* stop the timer */
3222         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_22);
3223         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
3224         /* free the TCB */
3225         SCTPDBG(SCTP_DEBUG_INPUT2,
3226             "sctp_handle_shutdown_complete: calls free-asoc\n");
3227 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3228         so = SCTP_INP_SO(stcb->sctp_ep);
3229         atomic_add_int(&stcb->asoc.refcnt, 1);
3230         SCTP_TCB_UNLOCK(stcb);
3231         SCTP_SOCKET_LOCK(so, 1);
3232         SCTP_TCB_LOCK(stcb);
3233         atomic_subtract_int(&stcb->asoc.refcnt, 1);
3234 #endif
3235         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_23);
3236 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3237         SCTP_SOCKET_UNLOCK(so, 1);
3238 #endif
3239         return;
3240 }
3241
3242 static int
3243 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc,
3244     struct sctp_nets *net, uint8_t flg)
3245 {
3246         switch (desc->chunk_type) {
3247         case SCTP_DATA:
3248                 /* find the tsn to resend (possibly */
3249                 {
3250                         uint32_t tsn;
3251                         struct sctp_tmit_chunk *tp1;
3252
3253                         tsn = ntohl(desc->tsn_ifany);
3254                         TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3255                                 if (tp1->rec.data.TSN_seq == tsn) {
3256                                         /* found it */
3257                                         break;
3258                                 }
3259                                 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, tsn)) {
3260                                         /* not found */
3261                                         tp1 = NULL;
3262                                         break;
3263                                 }
3264                         }
3265                         if (tp1 == NULL) {
3266                                 /*
3267                                  * Do it the other way , aka without paying
3268                                  * attention to queue seq order.
3269                                  */
3270                                 SCTP_STAT_INCR(sctps_pdrpdnfnd);
3271                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3272                                         if (tp1->rec.data.TSN_seq == tsn) {
3273                                                 /* found it */
3274                                                 break;
3275                                         }
3276                                 }
3277                         }
3278                         if (tp1 == NULL) {
3279                                 SCTP_STAT_INCR(sctps_pdrptsnnf);
3280                         }
3281                         if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) {
3282                                 uint8_t *ddp;
3283
3284                                 if (((flg & SCTP_BADCRC) == 0) &&
3285                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3286                                         return (0);
3287                                 }
3288                                 if ((stcb->asoc.peers_rwnd == 0) &&
3289                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3290                                         SCTP_STAT_INCR(sctps_pdrpdiwnp);
3291                                         return (0);
3292                                 }
3293                                 if (stcb->asoc.peers_rwnd == 0 &&
3294                                     (flg & SCTP_FROM_MIDDLE_BOX)) {
3295                                         SCTP_STAT_INCR(sctps_pdrpdizrw);
3296                                         return (0);
3297                                 }
3298                                 ddp = (uint8_t *) (mtod(tp1->data, caddr_t)+
3299                                     sizeof(struct sctp_data_chunk));
3300                                 {
3301                                         unsigned int iii;
3302
3303                                         for (iii = 0; iii < sizeof(desc->data_bytes);
3304                                             iii++) {
3305                                                 if (ddp[iii] != desc->data_bytes[iii]) {
3306                                                         SCTP_STAT_INCR(sctps_pdrpbadd);
3307                                                         return (-1);
3308                                                 }
3309                                         }
3310                                 }
3311
3312                                 if (tp1->do_rtt) {
3313                                         /*
3314                                          * this guy had a RTO calculation
3315                                          * pending on it, cancel it
3316                                          */
3317                                         if (tp1->whoTo->rto_needed == 0) {
3318                                                 tp1->whoTo->rto_needed = 1;
3319                                         }
3320                                         tp1->do_rtt = 0;
3321                                 }
3322                                 SCTP_STAT_INCR(sctps_pdrpmark);
3323                                 if (tp1->sent != SCTP_DATAGRAM_RESEND)
3324                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3325                                 /*
3326                                  * mark it as if we were doing a FR, since
3327                                  * we will be getting gap ack reports behind
3328                                  * the info from the router.
3329                                  */
3330                                 tp1->rec.data.doing_fast_retransmit = 1;
3331                                 /*
3332                                  * mark the tsn with what sequences can
3333                                  * cause a new FR.
3334                                  */
3335                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) {
3336                                         tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
3337                                 } else {
3338                                         tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq;
3339                                 }
3340
3341                                 /* restart the timer */
3342                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3343                                     stcb, tp1->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_24);
3344                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3345                                     stcb, tp1->whoTo);
3346
3347                                 /* fix counts and things */
3348                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
3349                                         sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP,
3350                                             tp1->whoTo->flight_size,
3351                                             tp1->book_size,
3352                                             (uintptr_t) stcb,
3353                                             tp1->rec.data.TSN_seq);
3354                                 }
3355                                 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
3356                                         sctp_flight_size_decrease(tp1);
3357                                         sctp_total_flight_decrease(stcb, tp1);
3358                                 }
3359                                 tp1->sent = SCTP_DATAGRAM_RESEND;
3360                         } {
3361                                 /* audit code */
3362                                 unsigned int audit;
3363
3364                                 audit = 0;
3365                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3366                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3367                                                 audit++;
3368                                 }
3369                                 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue,
3370                                     sctp_next) {
3371                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3372                                                 audit++;
3373                                 }
3374                                 if (audit != stcb->asoc.sent_queue_retran_cnt) {
3375                                         SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n",
3376                                             audit, stcb->asoc.sent_queue_retran_cnt);
3377 #ifndef SCTP_AUDITING_ENABLED
3378                                         stcb->asoc.sent_queue_retran_cnt = audit;
3379 #endif
3380                                 }
3381                         }
3382                 }
3383                 break;
3384         case SCTP_ASCONF:
3385                 {
3386                         struct sctp_tmit_chunk *asconf;
3387
3388                         TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue,
3389                             sctp_next) {
3390                                 if (asconf->rec.chunk_id.id == SCTP_ASCONF) {
3391                                         break;
3392                                 }
3393                         }
3394                         if (asconf) {
3395                                 if (asconf->sent != SCTP_DATAGRAM_RESEND)
3396                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3397                                 asconf->sent = SCTP_DATAGRAM_RESEND;
3398                                 asconf->snd_count--;
3399                         }
3400                 }
3401                 break;
3402         case SCTP_INITIATION:
3403                 /* resend the INIT */
3404                 stcb->asoc.dropped_special_cnt++;
3405                 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) {
3406                         /*
3407                          * If we can get it in, in a few attempts we do
3408                          * this, otherwise we let the timer fire.
3409                          */
3410                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep,
3411                             stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_25);
3412                         sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
3413                 }
3414                 break;
3415         case SCTP_SELECTIVE_ACK:
3416         case SCTP_NR_SELECTIVE_ACK:
3417                 /* resend the sack */
3418                 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED);
3419                 break;
3420         case SCTP_HEARTBEAT_REQUEST:
3421                 /* resend a demand HB */
3422                 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) {
3423                         /*
3424                          * Only retransmit if we KNOW we wont destroy the
3425                          * tcb
3426                          */
3427                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
3428                 }
3429                 break;
3430         case SCTP_SHUTDOWN:
3431                 sctp_send_shutdown(stcb, net);
3432                 break;
3433         case SCTP_SHUTDOWN_ACK:
3434                 sctp_send_shutdown_ack(stcb, net);
3435                 break;
3436         case SCTP_COOKIE_ECHO:
3437                 {
3438                         struct sctp_tmit_chunk *cookie;
3439
3440                         cookie = NULL;
3441                         TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue,
3442                             sctp_next) {
3443                                 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
3444                                         break;
3445                                 }
3446                         }
3447                         if (cookie) {
3448                                 if (cookie->sent != SCTP_DATAGRAM_RESEND)
3449                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3450                                 cookie->sent = SCTP_DATAGRAM_RESEND;
3451                                 sctp_stop_all_cookie_timers(stcb);
3452                         }
3453                 }
3454                 break;
3455         case SCTP_COOKIE_ACK:
3456                 sctp_send_cookie_ack(stcb);
3457                 break;
3458         case SCTP_ASCONF_ACK:
3459                 /* resend last asconf ack */
3460                 sctp_send_asconf_ack(stcb);
3461                 break;
3462         case SCTP_FORWARD_CUM_TSN:
3463                 send_forward_tsn(stcb, &stcb->asoc);
3464                 break;
3465                 /* can't do anything with these */
3466         case SCTP_PACKET_DROPPED:
3467         case SCTP_INITIATION_ACK:       /* this should not happen */
3468         case SCTP_HEARTBEAT_ACK:
3469         case SCTP_ABORT_ASSOCIATION:
3470         case SCTP_OPERATION_ERROR:
3471         case SCTP_SHUTDOWN_COMPLETE:
3472         case SCTP_ECN_ECHO:
3473         case SCTP_ECN_CWR:
3474         default:
3475                 break;
3476         }
3477         return (0);
3478 }
3479
3480 void
3481 sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list)
3482 {
3483         uint32_t i;
3484         uint16_t temp;
3485
3486         /*
3487          * We set things to 0xffff since this is the last delivered sequence
3488          * and we will be sending in 0 after the reset.
3489          */
3490
3491         if (number_entries) {
3492                 for (i = 0; i < number_entries; i++) {
3493                         temp = ntohs(list[i]);
3494                         if (temp >= stcb->asoc.streamincnt) {
3495                                 continue;
3496                         }
3497                         stcb->asoc.strmin[temp].last_sequence_delivered = 0xffff;
3498                 }
3499         } else {
3500                 list = NULL;
3501                 for (i = 0; i < stcb->asoc.streamincnt; i++) {
3502                         stcb->asoc.strmin[i].last_sequence_delivered = 0xffff;
3503                 }
3504         }
3505         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3506 }
3507
3508 static void
3509 sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list)
3510 {
3511         uint32_t i;
3512         uint16_t temp;
3513
3514         if (number_entries > 0) {
3515                 for (i = 0; i < number_entries; i++) {
3516                         temp = ntohs(list[i]);
3517                         if (temp >= stcb->asoc.streamoutcnt) {
3518                                 /* no such stream */
3519                                 continue;
3520                         }
3521                         stcb->asoc.strmout[temp].next_sequence_send = 0;
3522                 }
3523         } else {
3524                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3525                         stcb->asoc.strmout[i].next_sequence_send = 0;
3526                 }
3527         }
3528         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3529 }
3530
3531
3532 struct sctp_stream_reset_out_request *
3533 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk)
3534 {
3535         struct sctp_association *asoc;
3536         struct sctp_chunkhdr *ch;
3537         struct sctp_stream_reset_out_request *r;
3538         struct sctp_tmit_chunk *chk;
3539         int len, clen;
3540
3541         asoc = &stcb->asoc;
3542         if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
3543                 asoc->stream_reset_outstanding = 0;
3544                 return (NULL);
3545         }
3546         if (stcb->asoc.str_reset == NULL) {
3547                 asoc->stream_reset_outstanding = 0;
3548                 return (NULL);
3549         }
3550         chk = stcb->asoc.str_reset;
3551         if (chk->data == NULL) {
3552                 return (NULL);
3553         }
3554         if (bchk) {
3555                 /* he wants a copy of the chk pointer */
3556                 *bchk = chk;
3557         }
3558         clen = chk->send_size;
3559         ch = mtod(chk->data, struct sctp_chunkhdr *);
3560         r = (struct sctp_stream_reset_out_request *)(ch + 1);
3561         if (ntohl(r->request_seq) == seq) {
3562                 /* found it */
3563                 return (r);
3564         }
3565         len = SCTP_SIZE32(ntohs(r->ph.param_length));
3566         if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) {
3567                 /* move to the next one, there can only be a max of two */
3568                 r = (struct sctp_stream_reset_out_request *)((caddr_t)r + len);
3569                 if (ntohl(r->request_seq) == seq) {
3570                         return (r);
3571                 }
3572         }
3573         /* that seq is not here */
3574         return (NULL);
3575 }
3576
3577 static void
3578 sctp_clean_up_stream_reset(struct sctp_tcb *stcb)
3579 {
3580         struct sctp_association *asoc;
3581         struct sctp_tmit_chunk *chk = stcb->asoc.str_reset;
3582
3583         if (stcb->asoc.str_reset == NULL) {
3584                 return;
3585         }
3586         asoc = &stcb->asoc;
3587
3588         sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_26);
3589         TAILQ_REMOVE(&asoc->control_send_queue,
3590             chk,
3591             sctp_next);
3592         if (chk->data) {
3593                 sctp_m_freem(chk->data);
3594                 chk->data = NULL;
3595         }
3596         asoc->ctrl_queue_cnt--;
3597         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3598         /* sa_ignore NO_NULL_CHK */
3599         stcb->asoc.str_reset = NULL;
3600 }
3601
3602
3603 static int
3604 sctp_handle_stream_reset_response(struct sctp_tcb *stcb,
3605     uint32_t seq, uint32_t action,
3606     struct sctp_stream_reset_response *respin)
3607 {
3608         uint16_t type;
3609         int lparm_len;
3610         struct sctp_association *asoc = &stcb->asoc;
3611         struct sctp_tmit_chunk *chk;
3612         struct sctp_stream_reset_out_request *srparam;
3613         uint32_t number_entries;
3614
3615         if (asoc->stream_reset_outstanding == 0) {
3616                 /* duplicate */
3617                 return (0);
3618         }
3619         if (seq == stcb->asoc.str_reset_seq_out) {
3620                 srparam = sctp_find_stream_reset(stcb, seq, &chk);
3621                 if (srparam) {
3622                         stcb->asoc.str_reset_seq_out++;
3623                         type = ntohs(srparam->ph.param_type);
3624                         lparm_len = ntohs(srparam->ph.param_length);
3625                         if (type == SCTP_STR_RESET_OUT_REQUEST) {
3626                                 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t);
3627                                 asoc->stream_reset_out_is_outstanding = 0;
3628                                 if (asoc->stream_reset_outstanding)
3629                                         asoc->stream_reset_outstanding--;
3630                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3631                                         /* do it */
3632                                         sctp_reset_out_streams(stcb, number_entries, srparam->list_of_streams);
3633                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3634                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED);
3635                                 } else {
3636                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED);
3637                                 }
3638                         } else if (type == SCTP_STR_RESET_IN_REQUEST) {
3639                                 /* Answered my request */
3640                                 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t);
3641                                 if (asoc->stream_reset_outstanding)
3642                                         asoc->stream_reset_outstanding--;
3643                                 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3644                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb,
3645                                             number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED);
3646                                 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3647                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb,
3648                                             number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED);
3649                                 }
3650                         } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) {
3651                                 /* Ok we now may have more streams */
3652                                 int num_stream;
3653
3654                                 num_stream = stcb->asoc.strm_pending_add_size;
3655                                 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) {
3656                                         /* TSNH */
3657                                         num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt;
3658                                 }
3659                                 stcb->asoc.strm_pending_add_size = 0;
3660                                 if (asoc->stream_reset_outstanding)
3661                                         asoc->stream_reset_outstanding--;
3662                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3663                                         /* Put the new streams into effect */
3664                                         stcb->asoc.streamoutcnt += num_stream;
3665                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
3666                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3667                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3668                                             SCTP_STREAM_CHANGE_DENIED);
3669                                 } else {
3670                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3671                                             SCTP_STREAM_CHANGE_FAILED);
3672                                 }
3673                         } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) {
3674                                 if (asoc->stream_reset_outstanding)
3675                                         asoc->stream_reset_outstanding--;
3676                                 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3677                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3678                                             SCTP_STREAM_CHANGE_DENIED);
3679                                 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3680                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3681                                             SCTP_STREAM_CHANGE_FAILED);
3682                                 }
3683                         } else if (type == SCTP_STR_RESET_TSN_REQUEST) {
3684                                 /**
3685                                  * a) Adopt the new in tsn.
3686                                  * b) reset the map
3687                                  * c) Adopt the new out-tsn
3688                                  */
3689                                 struct sctp_stream_reset_response_tsn *resp;
3690                                 struct sctp_forward_tsn_chunk fwdtsn;
3691                                 int abort_flag = 0;
3692
3693                                 if (respin == NULL) {
3694                                         /* huh ? */
3695                                         return (0);
3696                                 }
3697                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3698                                         resp = (struct sctp_stream_reset_response_tsn *)respin;
3699                                         asoc->stream_reset_outstanding--;
3700                                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3701                                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3702                                         fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1);
3703                                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3704                                         if (abort_flag) {
3705                                                 return (1);
3706                                         }
3707                                         stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1);
3708                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3709                                                 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3710                                         }
3711                                         stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map;
3712                                         stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn);
3713                                         memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size);
3714
3715                                         stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map;
3716                                         memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size);
3717
3718                                         stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn);
3719                                         stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn;
3720
3721                                         sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL);
3722                                         sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL);
3723                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0);
3724                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3725                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
3726                                             SCTP_ASSOC_RESET_DENIED);
3727                                 } else {
3728                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
3729                                             SCTP_ASSOC_RESET_FAILED);
3730                                 }
3731                         }
3732                         /* get rid of the request and get the request flags */
3733                         if (asoc->stream_reset_outstanding == 0) {
3734                                 sctp_clean_up_stream_reset(stcb);
3735                         }
3736                 }
3737         }
3738         return (0);
3739 }
3740
3741 static void
3742 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb,
3743     struct sctp_tmit_chunk *chk,
3744     struct sctp_stream_reset_in_request *req, int trunc)
3745 {
3746         uint32_t seq;
3747         int len, i;
3748         int number_entries;
3749         uint16_t temp;
3750
3751         /*
3752          * peer wants me to send a str-reset to him for my outgoing seq's if
3753          * seq_in is right.
3754          */
3755         struct sctp_association *asoc = &stcb->asoc;
3756
3757         seq = ntohl(req->request_seq);
3758         if (asoc->str_reset_seq_in == seq) {
3759                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3760                 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
3761                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3762                 } else if (trunc) {
3763                         /* Can't do it, since they exceeded our buffer size  */
3764                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3765                 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) {
3766                         len = ntohs(req->ph.param_length);
3767                         number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t));
3768                         for (i = 0; i < number_entries; i++) {
3769                                 temp = ntohs(req->list_of_streams[i]);
3770                                 req->list_of_streams[i] = temp;
3771                         }
3772                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3773                         sctp_add_stream_reset_out(chk, number_entries, req->list_of_streams,
3774                             asoc->str_reset_seq_out,
3775                             seq, (asoc->sending_seq - 1));
3776                         asoc->stream_reset_out_is_outstanding = 1;
3777                         asoc->str_reset = chk;
3778                         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
3779                         stcb->asoc.stream_reset_outstanding++;
3780                 } else {
3781                         /* Can't do it, since we have sent one out */
3782                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
3783                 }
3784                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3785                 asoc->str_reset_seq_in++;
3786         } else if (asoc->str_reset_seq_in - 1 == seq) {
3787                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3788         } else if (asoc->str_reset_seq_in - 2 == seq) {
3789                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3790         } else {
3791                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3792         }
3793 }
3794
3795 static int
3796 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb,
3797     struct sctp_tmit_chunk *chk,
3798     struct sctp_stream_reset_tsn_request *req)
3799 {
3800         /* reset all in and out and update the tsn */
3801         /*
3802          * A) reset my str-seq's on in and out. B) Select a receive next,
3803          * and set cum-ack to it. Also process this selected number as a
3804          * fwd-tsn as well. C) set in the response my next sending seq.
3805          */
3806         struct sctp_forward_tsn_chunk fwdtsn;
3807         struct sctp_association *asoc = &stcb->asoc;
3808         int abort_flag = 0;
3809         uint32_t seq;
3810
3811         seq = ntohl(req->request_seq);
3812         if (asoc->str_reset_seq_in == seq) {
3813                 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0];
3814                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
3815                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3816                 } else {
3817                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3818                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3819                         fwdtsn.ch.chunk_flags = 0;
3820                         fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1);
3821                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3822                         if (abort_flag) {
3823                                 return (1);
3824                         }
3825                         asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA;
3826                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3827                                 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3828                         }
3829                         asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map;
3830                         asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1;
3831                         memset(asoc->mapping_array, 0, asoc->mapping_array_size);
3832                         asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
3833                         memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size);
3834                         atomic_add_int(&asoc->sending_seq, 1);
3835                         /* save off historical data for retrans */
3836                         asoc->last_sending_seq[1] = asoc->last_sending_seq[0];
3837                         asoc->last_sending_seq[0] = asoc->sending_seq;
3838                         asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0];
3839                         asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn;
3840                         sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL);
3841                         sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL);
3842                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3843                         sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0);
3844                 }
3845                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3846                     asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
3847                 asoc->str_reset_seq_in++;
3848         } else if (asoc->str_reset_seq_in - 1 == seq) {
3849                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3850                     asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
3851         } else if (asoc->str_reset_seq_in - 2 == seq) {
3852                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1],
3853                     asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]);
3854         } else {
3855                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3856         }
3857         return (0);
3858 }
3859
3860 static void
3861 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb,
3862     struct sctp_tmit_chunk *chk,
3863     struct sctp_stream_reset_out_request *req, int trunc)
3864 {
3865         uint32_t seq, tsn;
3866         int number_entries, len;
3867         struct sctp_association *asoc = &stcb->asoc;
3868
3869         seq = ntohl(req->request_seq);
3870
3871         /* now if its not a duplicate we process it */
3872         if (asoc->str_reset_seq_in == seq) {
3873                 len = ntohs(req->ph.param_length);
3874                 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t));
3875                 /*
3876                  * the sender is resetting, handle the list issue.. we must
3877                  * a) verify if we can do the reset, if so no problem b) If
3878                  * we can't do the reset we must copy the request. c) queue
3879                  * it, and setup the data in processor to trigger it off
3880                  * when needed and dequeue all the queued data.
3881                  */
3882                 tsn = ntohl(req->send_reset_at_tsn);
3883
3884                 /* move the reset action back one */
3885                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3886                 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
3887                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3888                 } else if (trunc) {
3889                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3890                 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) {
3891                         /* we can do it now */
3892                         sctp_reset_in_stream(stcb, number_entries, req->list_of_streams);
3893                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3894                 } else {
3895                         /*
3896                          * we must queue it up and thus wait for the TSN's
3897                          * to arrive that are at or before tsn
3898                          */
3899                         struct sctp_stream_reset_list *liste;
3900                         int siz;
3901
3902                         siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t));
3903                         SCTP_MALLOC(liste, struct sctp_stream_reset_list *,
3904                             siz, SCTP_M_STRESET);
3905                         if (liste == NULL) {
3906                                 /* gak out of memory */
3907                                 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3908                                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3909                                 return;
3910                         }
3911                         liste->tsn = tsn;
3912                         liste->number_entries = number_entries;
3913                         memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t));
3914                         TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp);
3915                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3916                 }
3917                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3918                 asoc->str_reset_seq_in++;
3919         } else if ((asoc->str_reset_seq_in - 1) == seq) {
3920                 /*
3921                  * one seq back, just echo back last action since my
3922                  * response was lost.
3923                  */
3924                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3925         } else if ((asoc->str_reset_seq_in - 2) == seq) {
3926                 /*
3927                  * two seq back, just echo back last action since my
3928                  * response was lost.
3929                  */
3930                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3931         } else {
3932                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3933         }
3934 }
3935
3936 static void
3937 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
3938     struct sctp_stream_reset_add_strm *str_add)
3939 {
3940         /*
3941          * Peer is requesting to add more streams. If its within our
3942          * max-streams we will allow it.
3943          */
3944         uint32_t num_stream, i;
3945         uint32_t seq;
3946         struct sctp_association *asoc = &stcb->asoc;
3947         struct sctp_queued_to_read *ctl, *nctl;
3948
3949         /* Get the number. */
3950         seq = ntohl(str_add->request_seq);
3951         num_stream = ntohs(str_add->number_of_streams);
3952         /* Now what would be the new total? */
3953         if (asoc->str_reset_seq_in == seq) {
3954                 num_stream += stcb->asoc.streamincnt;
3955                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
3956                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
3957                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3958                 } else if ((num_stream > stcb->asoc.max_inbound_streams) ||
3959                     (num_stream > 0xffff)) {
3960                         /* We must reject it they ask for to many */
3961         denied:
3962                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3963                 } else {
3964                         /* Ok, we can do that :-) */
3965                         struct sctp_stream_in *oldstrm;
3966
3967                         /* save off the old */
3968                         oldstrm = stcb->asoc.strmin;
3969                         SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *,
3970                             (num_stream * sizeof(struct sctp_stream_in)),
3971                             SCTP_M_STRMI);
3972                         if (stcb->asoc.strmin == NULL) {
3973                                 stcb->asoc.strmin = oldstrm;
3974                                 goto denied;
3975                         }
3976                         /* copy off the old data */
3977                         for (i = 0; i < stcb->asoc.streamincnt; i++) {
3978                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
3979                                 stcb->asoc.strmin[i].stream_no = i;
3980                                 stcb->asoc.strmin[i].last_sequence_delivered = oldstrm[i].last_sequence_delivered;
3981                                 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started;
3982                                 /* now anything on those queues? */
3983                                 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next, nctl) {
3984                                         TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next);
3985                                         TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next);
3986                                 }
3987                         }
3988                         /* Init the new streams */
3989                         for (i = stcb->asoc.streamincnt; i < num_stream; i++) {
3990                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
3991                                 stcb->asoc.strmin[i].stream_no = i;
3992                                 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff;
3993                                 stcb->asoc.strmin[i].delivery_started = 0;
3994                         }
3995                         SCTP_FREE(oldstrm, SCTP_M_STRMI);
3996                         /* update the size */
3997                         stcb->asoc.streamincnt = num_stream;
3998                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3999                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
4000                 }
4001                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4002                 asoc->str_reset_seq_in++;
4003         } else if ((asoc->str_reset_seq_in - 1) == seq) {
4004                 /*
4005                  * one seq back, just echo back last action since my
4006                  * response was lost.
4007                  */
4008                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4009         } else if ((asoc->str_reset_seq_in - 2) == seq) {
4010                 /*
4011                  * two seq back, just echo back last action since my
4012                  * response was lost.
4013                  */
4014                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
4015         } else {
4016                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
4017
4018         }
4019 }
4020
4021 static void
4022 sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
4023     struct sctp_stream_reset_add_strm *str_add)
4024 {
4025         /*
4026          * Peer is requesting to add more streams. If its within our
4027          * max-streams we will allow it.
4028          */
4029         uint16_t num_stream;
4030         uint32_t seq;
4031         struct sctp_association *asoc = &stcb->asoc;
4032
4033         /* Get the number. */
4034         seq = ntohl(str_add->request_seq);
4035         num_stream = ntohs(str_add->number_of_streams);
4036         /* Now what would be the new total? */
4037         if (asoc->str_reset_seq_in == seq) {
4038                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
4039                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
4040                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4041                 } else if (stcb->asoc.stream_reset_outstanding) {
4042                         /* We must reject it we have something pending */
4043                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
4044                 } else {
4045                         /* Ok, we can do that :-) */
4046                         int mychk;
4047
4048                         mychk = stcb->asoc.streamoutcnt;
4049                         mychk += num_stream;
4050                         if (mychk < 0x10000) {
4051                                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
4052                                 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 0, 1, num_stream, 0, 1)) {
4053                                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4054                                 }
4055                         } else {
4056                                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4057                         }
4058                 }
4059                 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]);
4060                 asoc->str_reset_seq_in++;
4061         } else if ((asoc->str_reset_seq_in - 1) == seq) {
4062                 /*
4063                  * one seq back, just echo back last action since my
4064                  * response was lost.
4065                  */
4066                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4067         } else if ((asoc->str_reset_seq_in - 2) == seq) {
4068                 /*
4069                  * two seq back, just echo back last action since my
4070                  * response was lost.
4071                  */
4072                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
4073         } else {
4074                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
4075         }
4076 }
4077
4078 #ifdef __GNUC__
4079 __attribute__((noinline))
4080 #endif
4081         static int
4082             sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset,
4083         struct sctp_chunkhdr *ch_req)
4084 {
4085         int chk_length, param_len, ptype;
4086         struct sctp_paramhdr pstore;
4087         uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE];
4088         uint32_t seq = 0;
4089         int num_req = 0;
4090         int trunc = 0;
4091         struct sctp_tmit_chunk *chk;
4092         struct sctp_chunkhdr *ch;
4093         struct sctp_paramhdr *ph;
4094         int ret_code = 0;
4095         int num_param = 0;
4096
4097         /* now it may be a reset or a reset-response */
4098         chk_length = ntohs(ch_req->chunk_length);
4099
4100         /* setup for adding the response */
4101         sctp_alloc_a_chunk(stcb, chk);
4102         if (chk == NULL) {
4103                 return (ret_code);
4104         }
4105         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
4106         chk->rec.chunk_id.can_take_data = 0;
4107         chk->asoc = &stcb->asoc;
4108         chk->no_fr_allowed = 0;
4109         chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr);
4110         chk->book_size_scale = 0;
4111         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
4112         if (chk->data == NULL) {
4113 strres_nochunk:
4114                 if (chk->data) {
4115                         sctp_m_freem(chk->data);
4116                         chk->data = NULL;
4117                 }
4118                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
4119                 return (ret_code);
4120         }
4121         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
4122
4123         /* setup chunk parameters */
4124         chk->sent = SCTP_DATAGRAM_UNSENT;
4125         chk->snd_count = 0;
4126         chk->whoTo = NULL;
4127
4128         ch = mtod(chk->data, struct sctp_chunkhdr *);
4129         ch->chunk_type = SCTP_STREAM_RESET;
4130         ch->chunk_flags = 0;
4131         ch->chunk_length = htons(chk->send_size);
4132         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
4133         offset += sizeof(struct sctp_chunkhdr);
4134         while ((size_t)chk_length >= sizeof(struct sctp_stream_reset_tsn_request)) {
4135                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *) & pstore);
4136                 if (ph == NULL)
4137                         break;
4138                 param_len = ntohs(ph->param_length);
4139                 if (param_len < (int)sizeof(struct sctp_stream_reset_tsn_request)) {
4140                         /* bad param */
4141                         break;
4142                 }
4143                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, (int)sizeof(cstore)),
4144                     (uint8_t *) & cstore);
4145                 ptype = ntohs(ph->param_type);
4146                 num_param++;
4147                 if (param_len > (int)sizeof(cstore)) {
4148                         trunc = 1;
4149                 } else {
4150                         trunc = 0;
4151                 }
4152                 if (num_param > SCTP_MAX_RESET_PARAMS) {
4153                         /* hit the max of parameters already sorry.. */
4154                         break;
4155                 }
4156                 if (ptype == SCTP_STR_RESET_OUT_REQUEST) {
4157                         struct sctp_stream_reset_out_request *req_out;
4158
4159                         req_out = (struct sctp_stream_reset_out_request *)ph;
4160                         num_req++;
4161                         if (stcb->asoc.stream_reset_outstanding) {
4162                                 seq = ntohl(req_out->response_seq);
4163                                 if (seq == stcb->asoc.str_reset_seq_out) {
4164                                         /* implicit ack */
4165                                         (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL);
4166                                 }
4167                         }
4168                         sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc);
4169                 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) {
4170                         struct sctp_stream_reset_add_strm *str_add;
4171
4172                         str_add = (struct sctp_stream_reset_add_strm *)ph;
4173                         num_req++;
4174                         sctp_handle_str_reset_add_strm(stcb, chk, str_add);
4175                 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) {
4176                         struct sctp_stream_reset_add_strm *str_add;
4177
4178                         str_add = (struct sctp_stream_reset_add_strm *)ph;
4179                         num_req++;
4180                         sctp_handle_str_reset_add_out_strm(stcb, chk, str_add);
4181                 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) {
4182                         struct sctp_stream_reset_in_request *req_in;
4183
4184                         num_req++;
4185                         req_in = (struct sctp_stream_reset_in_request *)ph;
4186                         sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc);
4187                 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) {
4188                         struct sctp_stream_reset_tsn_request *req_tsn;
4189
4190                         num_req++;
4191                         req_tsn = (struct sctp_stream_reset_tsn_request *)ph;
4192                         if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) {
4193                                 ret_code = 1;
4194                                 goto strres_nochunk;
4195                         }
4196                         /* no more */
4197                         break;
4198                 } else if (ptype == SCTP_STR_RESET_RESPONSE) {
4199                         struct sctp_stream_reset_response *resp;
4200                         uint32_t result;
4201
4202                         resp = (struct sctp_stream_reset_response *)ph;
4203                         seq = ntohl(resp->response_seq);
4204                         result = ntohl(resp->result);
4205                         if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) {
4206                                 ret_code = 1;
4207                                 goto strres_nochunk;
4208                         }
4209                 } else {
4210                         break;
4211                 }
4212                 offset += SCTP_SIZE32(param_len);
4213                 chk_length -= SCTP_SIZE32(param_len);
4214         }
4215         if (num_req == 0) {
4216                 /* we have no response free the stuff */
4217                 goto strres_nochunk;
4218         }
4219         /* ok we have a chunk to link in */
4220         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue,
4221             chk,
4222             sctp_next);
4223         stcb->asoc.ctrl_queue_cnt++;
4224         return (ret_code);
4225 }
4226
4227 /*
4228  * Handle a router or endpoints report of a packet loss, there are two ways
4229  * to handle this, either we get the whole packet and must disect it
4230  * ourselves (possibly with truncation and or corruption) or it is a summary
4231  * from a middle box that did the disectting for us.
4232  */
4233 static void
4234 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp,
4235     struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit)
4236 {
4237         uint32_t bottle_bw, on_queue;
4238         uint16_t trunc_len;
4239         unsigned int chlen;
4240         unsigned int at;
4241         struct sctp_chunk_desc desc;
4242         struct sctp_chunkhdr *ch;
4243
4244         chlen = ntohs(cp->ch.chunk_length);
4245         chlen -= sizeof(struct sctp_pktdrop_chunk);
4246         /* XXX possible chlen underflow */
4247         if (chlen == 0) {
4248                 ch = NULL;
4249                 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)
4250                         SCTP_STAT_INCR(sctps_pdrpbwrpt);
4251         } else {
4252                 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr));
4253                 chlen -= sizeof(struct sctphdr);
4254                 /* XXX possible chlen underflow */
4255                 memset(&desc, 0, sizeof(desc));
4256         }
4257         trunc_len = (uint16_t) ntohs(cp->trunc_len);
4258         if (trunc_len > limit) {
4259                 trunc_len = limit;
4260         }
4261         /* now the chunks themselves */
4262         while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) {
4263                 desc.chunk_type = ch->chunk_type;
4264                 /* get amount we need to move */
4265                 at = ntohs(ch->chunk_length);
4266                 if (at < sizeof(struct sctp_chunkhdr)) {
4267                         /* corrupt chunk, maybe at the end? */
4268                         SCTP_STAT_INCR(sctps_pdrpcrupt);
4269                         break;
4270                 }
4271                 if (trunc_len == 0) {
4272                         /* we are supposed to have all of it */
4273                         if (at > chlen) {
4274                                 /* corrupt skip it */
4275                                 SCTP_STAT_INCR(sctps_pdrpcrupt);
4276                                 break;
4277                         }
4278                 } else {
4279                         /* is there enough of it left ? */
4280                         if (desc.chunk_type == SCTP_DATA) {
4281                                 if (chlen < (sizeof(struct sctp_data_chunk) +
4282                                     sizeof(desc.data_bytes))) {
4283                                         break;
4284                                 }
4285                         } else {
4286                                 if (chlen < sizeof(struct sctp_chunkhdr)) {
4287                                         break;
4288                                 }
4289                         }
4290                 }
4291                 if (desc.chunk_type == SCTP_DATA) {
4292                         /* can we get out the tsn? */
4293                         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
4294                                 SCTP_STAT_INCR(sctps_pdrpmbda);
4295
4296                         if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) {
4297                                 /* yep */
4298                                 struct sctp_data_chunk *dcp;
4299                                 uint8_t *ddp;
4300                                 unsigned int iii;
4301
4302                                 dcp = (struct sctp_data_chunk *)ch;
4303                                 ddp = (uint8_t *) (dcp + 1);
4304                                 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) {
4305                                         desc.data_bytes[iii] = ddp[iii];
4306                                 }
4307                                 desc.tsn_ifany = dcp->dp.tsn;
4308                         } else {
4309                                 /* nope we are done. */
4310                                 SCTP_STAT_INCR(sctps_pdrpnedat);
4311                                 break;
4312                         }
4313                 } else {
4314                         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
4315                                 SCTP_STAT_INCR(sctps_pdrpmbct);
4316                 }
4317
4318                 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) {
4319                         SCTP_STAT_INCR(sctps_pdrppdbrk);
4320                         break;
4321                 }
4322                 if (SCTP_SIZE32(at) > chlen) {
4323                         break;
4324                 }
4325                 chlen -= SCTP_SIZE32(at);
4326                 if (chlen < sizeof(struct sctp_chunkhdr)) {
4327                         /* done, none left */
4328                         break;
4329                 }
4330                 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at));
4331         }
4332         /* Now update any rwnd --- possibly */
4333         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) {
4334                 /* From a peer, we get a rwnd report */
4335                 uint32_t a_rwnd;
4336
4337                 SCTP_STAT_INCR(sctps_pdrpfehos);
4338
4339                 bottle_bw = ntohl(cp->bottle_bw);
4340                 on_queue = ntohl(cp->current_onq);
4341                 if (bottle_bw && on_queue) {
4342                         /* a rwnd report is in here */
4343                         if (bottle_bw > on_queue)
4344                                 a_rwnd = bottle_bw - on_queue;
4345                         else
4346                                 a_rwnd = 0;
4347
4348                         if (a_rwnd == 0)
4349                                 stcb->asoc.peers_rwnd = 0;
4350                         else {
4351                                 if (a_rwnd > stcb->asoc.total_flight) {
4352                                         stcb->asoc.peers_rwnd =
4353                                             a_rwnd - stcb->asoc.total_flight;
4354                                 } else {
4355                                         stcb->asoc.peers_rwnd = 0;
4356                                 }
4357                                 if (stcb->asoc.peers_rwnd <
4358                                     stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
4359                                         /* SWS sender side engages */
4360                                         stcb->asoc.peers_rwnd = 0;
4361                                 }
4362                         }
4363                 }
4364         } else {
4365                 SCTP_STAT_INCR(sctps_pdrpfmbox);
4366         }
4367
4368         /* now middle boxes in sat networks get a cwnd bump */
4369         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) &&
4370             (stcb->asoc.sat_t3_loss_recovery == 0) &&
4371             (stcb->asoc.sat_network)) {
4372                 /*
4373                  * This is debateable but for sat networks it makes sense
4374                  * Note if a T3 timer has went off, we will prohibit any
4375                  * changes to cwnd until we exit the t3 loss recovery.
4376                  */
4377                 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb,
4378                     net, cp, &bottle_bw, &on_queue);
4379         }
4380 }
4381
4382 /*
4383  * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to
4384  * still contain IP/SCTP header - stcb: is the tcb found for this packet -
4385  * offset: offset into the mbuf chain to first chunkhdr - length: is the
4386  * length of the complete packet outputs: - length: modified to remaining
4387  * length after control processing - netp: modified to new sctp_nets after
4388  * cookie-echo processing - return NULL to discard the packet (ie. no asoc,
4389  * bad packet,...) otherwise return the tcb for this packet
4390  */
4391 #ifdef __GNUC__
4392 __attribute__((noinline))
4393 #endif
4394         static struct sctp_tcb *
4395                  sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length,
4396              struct sockaddr *src, struct sockaddr *dst,
4397              struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp,
4398              struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen,
4399              uint8_t use_mflowid, uint32_t mflowid,
4400              uint32_t vrf_id, uint16_t port)
4401 {
4402         struct sctp_association *asoc;
4403         uint32_t vtag_in;
4404         int num_chunks = 0;     /* number of control chunks processed */
4405         uint32_t chk_length;
4406         int ret;
4407         int abort_no_unlock = 0;
4408         int ecne_seen = 0;
4409
4410         /*
4411          * How big should this be, and should it be alloc'd? Lets try the
4412          * d-mtu-ceiling for now (2k) and that should hopefully work ...
4413          * until we get into jumbo grams and such..
4414          */
4415         uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE];
4416         struct sctp_tcb *locked_tcb = stcb;
4417         int got_auth = 0;
4418         uint32_t auth_offset = 0, auth_len = 0;
4419         int auth_skipped = 0;
4420         int asconf_cnt = 0;
4421
4422 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4423         struct socket *so;
4424
4425 #endif
4426
4427         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n",
4428             iphlen, *offset, length, (void *)stcb);
4429
4430         /* validate chunk header length... */
4431         if (ntohs(ch->chunk_length) < sizeof(*ch)) {
4432                 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n",
4433                     ntohs(ch->chunk_length));
4434                 if (locked_tcb) {
4435                         SCTP_TCB_UNLOCK(locked_tcb);
4436                 }
4437                 return (NULL);
4438         }
4439         /*
4440          * validate the verification tag
4441          */
4442         vtag_in = ntohl(sh->v_tag);
4443
4444         if (locked_tcb) {
4445                 SCTP_TCB_LOCK_ASSERT(locked_tcb);
4446         }
4447         if (ch->chunk_type == SCTP_INITIATION) {
4448                 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n",
4449                     ntohs(ch->chunk_length), vtag_in);
4450                 if (vtag_in != 0) {
4451                         /* protocol error- silently discard... */
4452                         SCTP_STAT_INCR(sctps_badvtag);
4453                         if (locked_tcb) {
4454                                 SCTP_TCB_UNLOCK(locked_tcb);
4455                         }
4456                         return (NULL);
4457                 }
4458         } else if (ch->chunk_type != SCTP_COOKIE_ECHO) {
4459                 /*
4460                  * If there is no stcb, skip the AUTH chunk and process
4461                  * later after a stcb is found (to validate the lookup was
4462                  * valid.
4463                  */
4464                 if ((ch->chunk_type == SCTP_AUTHENTICATION) &&
4465                     (stcb == NULL) &&
4466                     !SCTP_BASE_SYSCTL(sctp_auth_disable)) {
4467                         /* save this chunk for later processing */
4468                         auth_skipped = 1;
4469                         auth_offset = *offset;
4470                         auth_len = ntohs(ch->chunk_length);
4471
4472                         /* (temporarily) move past this chunk */
4473                         *offset += SCTP_SIZE32(auth_len);
4474                         if (*offset >= length) {
4475                                 /* no more data left in the mbuf chain */
4476                                 *offset = length;
4477                                 if (locked_tcb) {
4478                                         SCTP_TCB_UNLOCK(locked_tcb);
4479                                 }
4480                                 return (NULL);
4481                         }
4482                         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4483                             sizeof(struct sctp_chunkhdr), chunk_buf);
4484                 }
4485                 if (ch == NULL) {
4486                         /* Help */
4487                         *offset = length;
4488                         if (locked_tcb) {
4489                                 SCTP_TCB_UNLOCK(locked_tcb);
4490                         }
4491                         return (NULL);
4492                 }
4493                 if (ch->chunk_type == SCTP_COOKIE_ECHO) {
4494                         goto process_control_chunks;
4495                 }
4496                 /*
4497                  * first check if it's an ASCONF with an unknown src addr we
4498                  * need to look inside to find the association
4499                  */
4500                 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) {
4501                         struct sctp_chunkhdr *asconf_ch = ch;
4502                         uint32_t asconf_offset = 0, asconf_len = 0;
4503
4504                         /* inp's refcount may be reduced */
4505                         SCTP_INP_INCR_REF(inp);
4506
4507                         asconf_offset = *offset;
4508                         do {
4509                                 asconf_len = ntohs(asconf_ch->chunk_length);
4510                                 if (asconf_len < sizeof(struct sctp_asconf_paramhdr))
4511                                         break;
4512                                 stcb = sctp_findassociation_ep_asconf(m,
4513                                     *offset,
4514                                     dst,
4515                                     sh, &inp, netp, vrf_id);
4516                                 if (stcb != NULL)
4517                                         break;
4518                                 asconf_offset += SCTP_SIZE32(asconf_len);
4519                                 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset,
4520                                     sizeof(struct sctp_chunkhdr), chunk_buf);
4521                         } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF);
4522                         if (stcb == NULL) {
4523                                 /*
4524                                  * reduce inp's refcount if not reduced in
4525                                  * sctp_findassociation_ep_asconf().
4526                                  */
4527                                 SCTP_INP_DECR_REF(inp);
4528                         } else {
4529                                 locked_tcb = stcb;
4530                         }
4531
4532                         /* now go back and verify any auth chunk to be sure */
4533                         if (auth_skipped && (stcb != NULL)) {
4534                                 struct sctp_auth_chunk *auth;
4535
4536                                 auth = (struct sctp_auth_chunk *)
4537                                     sctp_m_getptr(m, auth_offset,
4538                                     auth_len, chunk_buf);
4539                                 got_auth = 1;
4540                                 auth_skipped = 0;
4541                                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m,
4542                                     auth_offset)) {
4543                                         /* auth HMAC failed so dump it */
4544                                         *offset = length;
4545                                         if (locked_tcb) {
4546                                                 SCTP_TCB_UNLOCK(locked_tcb);
4547                                         }
4548                                         return (NULL);
4549                                 } else {
4550                                         /* remaining chunks are HMAC checked */
4551                                         stcb->asoc.authenticated = 1;
4552                                 }
4553                         }
4554                 }
4555                 if (stcb == NULL) {
4556                         /* no association, so it's out of the blue... */
4557                         sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp,
4558                             use_mflowid, mflowid,
4559                             vrf_id, port);
4560                         *offset = length;
4561                         if (locked_tcb) {
4562                                 SCTP_TCB_UNLOCK(locked_tcb);
4563                         }
4564                         return (NULL);
4565                 }
4566                 asoc = &stcb->asoc;
4567                 /* ABORT and SHUTDOWN can use either v_tag... */
4568                 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) ||
4569                     (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) ||
4570                     (ch->chunk_type == SCTP_PACKET_DROPPED)) {
4571                         /* Take the T-bit always into account. */
4572                         if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) &&
4573                             (vtag_in == asoc->my_vtag)) ||
4574                             (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) &&
4575                             (vtag_in == asoc->peer_vtag))) {
4576                                 /* this is valid */
4577                         } else {
4578                                 /* drop this packet... */
4579                                 SCTP_STAT_INCR(sctps_badvtag);
4580                                 if (locked_tcb) {
4581                                         SCTP_TCB_UNLOCK(locked_tcb);
4582                                 }
4583                                 return (NULL);
4584                         }
4585                 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
4586                         if (vtag_in != asoc->my_vtag) {
4587                                 /*
4588                                  * this could be a stale SHUTDOWN-ACK or the
4589                                  * peer never got the SHUTDOWN-COMPLETE and
4590                                  * is still hung; we have started a new asoc
4591                                  * but it won't complete until the shutdown
4592                                  * is completed
4593                                  */
4594                                 if (locked_tcb) {
4595                                         SCTP_TCB_UNLOCK(locked_tcb);
4596                                 }
4597                                 sctp_handle_ootb(m, iphlen, *offset, src, dst,
4598                                     sh, inp,
4599                                     use_mflowid, mflowid,
4600                                     vrf_id, port);
4601                                 return (NULL);
4602                         }
4603                 } else {
4604                         /* for all other chunks, vtag must match */
4605                         if (vtag_in != asoc->my_vtag) {
4606                                 /* invalid vtag... */
4607                                 SCTPDBG(SCTP_DEBUG_INPUT3,
4608                                     "invalid vtag: %xh, expect %xh\n",
4609                                     vtag_in, asoc->my_vtag);
4610                                 SCTP_STAT_INCR(sctps_badvtag);
4611                                 if (locked_tcb) {
4612                                         SCTP_TCB_UNLOCK(locked_tcb);
4613                                 }
4614                                 *offset = length;
4615                                 return (NULL);
4616                         }
4617                 }
4618         }                       /* end if !SCTP_COOKIE_ECHO */
4619         /*
4620          * process all control chunks...
4621          */
4622         if (((ch->chunk_type == SCTP_SELECTIVE_ACK) ||
4623             (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) ||
4624             (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) &&
4625             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) {
4626                 /* implied cookie-ack.. we must have lost the ack */
4627                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
4628                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
4629                             stcb->asoc.overall_error_count,
4630                             0,
4631                             SCTP_FROM_SCTP_INPUT,
4632                             __LINE__);
4633                 }
4634                 stcb->asoc.overall_error_count = 0;
4635                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb,
4636                     *netp);
4637         }
4638 process_control_chunks:
4639         while (IS_SCTP_CONTROL(ch)) {
4640                 /* validate chunk length */
4641                 chk_length = ntohs(ch->chunk_length);
4642                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n",
4643                     ch->chunk_type, chk_length);
4644                 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length);
4645                 if (chk_length < sizeof(*ch) ||
4646                     (*offset + (int)chk_length) > length) {
4647                         *offset = length;
4648                         if (locked_tcb) {
4649                                 SCTP_TCB_UNLOCK(locked_tcb);
4650                         }
4651                         return (NULL);
4652                 }
4653                 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks);
4654                 /*
4655                  * INIT-ACK only gets the init ack "header" portion only
4656                  * because we don't have to process the peer's COOKIE. All
4657                  * others get a complete chunk.
4658                  */
4659                 if ((ch->chunk_type == SCTP_INITIATION_ACK) ||
4660                     (ch->chunk_type == SCTP_INITIATION)) {
4661                         /* get an init-ack chunk */
4662                         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4663                             sizeof(struct sctp_init_ack_chunk), chunk_buf);
4664                         if (ch == NULL) {
4665                                 *offset = length;
4666                                 if (locked_tcb) {
4667                                         SCTP_TCB_UNLOCK(locked_tcb);
4668                                 }
4669                                 return (NULL);
4670                         }
4671                 } else {
4672                         /* For cookies and all other chunks. */
4673                         if (chk_length > sizeof(chunk_buf)) {
4674                                 /*
4675                                  * use just the size of the chunk buffer so
4676                                  * the front part of our chunks fit in
4677                                  * contiguous space up to the chunk buffer
4678                                  * size (508 bytes). For chunks that need to
4679                                  * get more than that they must use the
4680                                  * sctp_m_getptr() function or other means
4681                                  * (e.g. know how to parse mbuf chains).
4682                                  * Cookies do this already.
4683                                  */
4684                                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4685                                     (sizeof(chunk_buf) - 4),
4686                                     chunk_buf);
4687                                 if (ch == NULL) {
4688                                         *offset = length;
4689                                         if (locked_tcb) {
4690                                                 SCTP_TCB_UNLOCK(locked_tcb);
4691                                         }
4692                                         return (NULL);
4693                                 }
4694                         } else {
4695                                 /* We can fit it all */
4696                                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4697                                     chk_length, chunk_buf);
4698                                 if (ch == NULL) {
4699                                         SCTP_PRINTF("sctp_process_control: Can't get the all data....\n");
4700                                         *offset = length;
4701                                         if (locked_tcb) {
4702                                                 SCTP_TCB_UNLOCK(locked_tcb);
4703                                         }
4704                                         return (NULL);
4705                                 }
4706                         }
4707                 }
4708                 num_chunks++;
4709                 /* Save off the last place we got a control from */
4710                 if (stcb != NULL) {
4711                         if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) {
4712                                 /*
4713                                  * allow last_control to be NULL if
4714                                  * ASCONF... ASCONF processing will find the
4715                                  * right net later
4716                                  */
4717                                 if ((netp != NULL) && (*netp != NULL))
4718                                         stcb->asoc.last_control_chunk_from = *netp;
4719                         }
4720                 }
4721 #ifdef SCTP_AUDITING_ENABLED
4722                 sctp_audit_log(0xB0, ch->chunk_type);
4723 #endif
4724
4725                 /* check to see if this chunk required auth, but isn't */
4726                 if ((stcb != NULL) &&
4727                     !SCTP_BASE_SYSCTL(sctp_auth_disable) &&
4728                     sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) &&
4729                     !stcb->asoc.authenticated) {
4730                         /* "silently" ignore */
4731                         SCTP_STAT_INCR(sctps_recvauthmissing);
4732                         goto next_chunk;
4733                 }
4734                 switch (ch->chunk_type) {
4735                 case SCTP_INITIATION:
4736                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n");
4737                         /* The INIT chunk must be the only chunk. */
4738                         if ((num_chunks > 1) ||
4739                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4740                                 sctp_abort_association(inp, stcb, m, iphlen,
4741                                     src, dst, sh, NULL,
4742                                     use_mflowid, mflowid,
4743                                     vrf_id, port);
4744                                 *offset = length;
4745                                 return (NULL);
4746                         }
4747                         /* Honor our resource limit. */
4748                         if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) {
4749                                 struct mbuf *op_err;
4750
4751                                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC);
4752                                 sctp_abort_association(inp, stcb, m, iphlen,
4753                                     src, dst, sh, op_err,
4754                                     use_mflowid, mflowid,
4755                                     vrf_id, port);
4756                                 *offset = length;
4757                                 return (NULL);
4758                         }
4759                         sctp_handle_init(m, iphlen, *offset, src, dst, sh,
4760                             (struct sctp_init_chunk *)ch, inp,
4761                             stcb, &abort_no_unlock,
4762                             use_mflowid, mflowid,
4763                             vrf_id, port);
4764                         *offset = length;
4765                         if ((!abort_no_unlock) && (locked_tcb)) {
4766                                 SCTP_TCB_UNLOCK(locked_tcb);
4767                         }
4768                         return (NULL);
4769                         break;
4770                 case SCTP_PAD_CHUNK:
4771                         break;
4772                 case SCTP_INITIATION_ACK:
4773                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT-ACK\n");
4774                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4775                                 /* We are not interested anymore */
4776                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
4777                                         ;
4778                                 } else {
4779                                         if (locked_tcb != stcb) {
4780                                                 /* Very unlikely */
4781                                                 SCTP_TCB_UNLOCK(locked_tcb);
4782                                         }
4783                                         *offset = length;
4784                                         if (stcb) {
4785 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4786                                                 so = SCTP_INP_SO(inp);
4787                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4788                                                 SCTP_TCB_UNLOCK(stcb);
4789                                                 SCTP_SOCKET_LOCK(so, 1);
4790                                                 SCTP_TCB_LOCK(stcb);
4791                                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4792 #endif
4793                                                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27);
4794 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4795                                                 SCTP_SOCKET_UNLOCK(so, 1);
4796 #endif
4797                                         }
4798                                         return (NULL);
4799                                 }
4800                         }
4801                         /* The INIT-ACK chunk must be the only chunk. */
4802                         if ((num_chunks > 1) ||
4803                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4804                                 *offset = length;
4805                                 if (locked_tcb) {
4806                                         SCTP_TCB_UNLOCK(locked_tcb);
4807                                 }
4808                                 return (NULL);
4809                         }
4810                         if ((netp) && (*netp)) {
4811                                 ret = sctp_handle_init_ack(m, iphlen, *offset,
4812                                     src, dst, sh,
4813                                     (struct sctp_init_ack_chunk *)ch,
4814                                     stcb, *netp,
4815                                     &abort_no_unlock,
4816                                     use_mflowid, mflowid,
4817                                     vrf_id);
4818                         } else {
4819                                 ret = -1;
4820                         }
4821                         *offset = length;
4822                         if (abort_no_unlock) {
4823                                 return (NULL);
4824                         }
4825                         /*
4826                          * Special case, I must call the output routine to
4827                          * get the cookie echoed
4828                          */
4829                         if ((stcb != NULL) && (ret == 0)) {
4830                                 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
4831                         }
4832                         if (locked_tcb) {
4833                                 SCTP_TCB_UNLOCK(locked_tcb);
4834                         }
4835                         return (NULL);
4836                         break;
4837                 case SCTP_SELECTIVE_ACK:
4838                         {
4839                                 struct sctp_sack_chunk *sack;
4840                                 int abort_now = 0;
4841                                 uint32_t a_rwnd, cum_ack;
4842                                 uint16_t num_seg, num_dup;
4843                                 uint8_t flags;
4844                                 int offset_seg, offset_dup;
4845
4846                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK\n");
4847                                 SCTP_STAT_INCR(sctps_recvsacks);
4848                                 if (stcb == NULL) {
4849                                         SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing SACK chunk\n");
4850                                         break;
4851                                 }
4852                                 if (chk_length < sizeof(struct sctp_sack_chunk)) {
4853                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n");
4854                                         break;
4855                                 }
4856                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
4857                                         /*-
4858                                          * If we have sent a shutdown-ack, we will pay no
4859                                          * attention to a sack sent in to us since
4860                                          * we don't care anymore.
4861                                          */
4862                                         break;
4863                                 }
4864                                 sack = (struct sctp_sack_chunk *)ch;
4865                                 flags = ch->chunk_flags;
4866                                 cum_ack = ntohl(sack->sack.cum_tsn_ack);
4867                                 num_seg = ntohs(sack->sack.num_gap_ack_blks);
4868                                 num_dup = ntohs(sack->sack.num_dup_tsns);
4869                                 a_rwnd = (uint32_t) ntohl(sack->sack.a_rwnd);
4870                                 if (sizeof(struct sctp_sack_chunk) +
4871                                     num_seg * sizeof(struct sctp_gap_ack_block) +
4872                                     num_dup * sizeof(uint32_t) != chk_length) {
4873                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n");
4874                                         break;
4875                                 }
4876                                 offset_seg = *offset + sizeof(struct sctp_sack_chunk);
4877                                 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
4878                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n",
4879                                     cum_ack, num_seg, a_rwnd);
4880                                 stcb->asoc.seen_a_sack_this_pkt = 1;
4881                                 if ((stcb->asoc.pr_sctp_cnt == 0) &&
4882                                     (num_seg == 0) &&
4883                                     SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
4884                                     (stcb->asoc.saw_sack_with_frags == 0) &&
4885                                     (stcb->asoc.saw_sack_with_nr_frags == 0) &&
4886                                     (!TAILQ_EMPTY(&stcb->asoc.sent_queue))
4887                                     ) {
4888                                         /*
4889                                          * We have a SIMPLE sack having no
4890                                          * prior segments and data on sent
4891                                          * queue to be acked.. Use the
4892                                          * faster path sack processing. We
4893                                          * also allow window update sacks
4894                                          * with no missing segments to go
4895                                          * this way too.
4896                                          */
4897                                         sctp_express_handle_sack(stcb, cum_ack, a_rwnd, &abort_now, ecne_seen);
4898                                 } else {
4899                                         if (netp && *netp)
4900                                                 sctp_handle_sack(m, offset_seg, offset_dup, stcb,
4901                                                     num_seg, 0, num_dup, &abort_now, flags,
4902                                                     cum_ack, a_rwnd, ecne_seen);
4903                                 }
4904                                 if (abort_now) {
4905                                         /* ABORT signal from sack processing */
4906                                         *offset = length;
4907                                         return (NULL);
4908                                 }
4909                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
4910                                     TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
4911                                     (stcb->asoc.stream_queue_cnt == 0)) {
4912                                         sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
4913                                 }
4914                         }
4915                         break;
4916                         /*
4917                          * EY - nr_sack:  If the received chunk is an
4918                          * nr_sack chunk
4919                          */
4920                 case SCTP_NR_SELECTIVE_ACK:
4921                         {
4922                                 struct sctp_nr_sack_chunk *nr_sack;
4923                                 int abort_now = 0;
4924                                 uint32_t a_rwnd, cum_ack;
4925                                 uint16_t num_seg, num_nr_seg, num_dup;
4926                                 uint8_t flags;
4927                                 int offset_seg, offset_dup;
4928
4929                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK\n");
4930                                 SCTP_STAT_INCR(sctps_recvsacks);
4931                                 if (stcb == NULL) {
4932                                         SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing NR-SACK chunk\n");
4933                                         break;
4934                                 }
4935                                 if ((stcb->asoc.sctp_nr_sack_on_off == 0) ||
4936                                     (stcb->asoc.peer_supports_nr_sack == 0)) {
4937                                         goto unknown_chunk;
4938                                 }
4939                                 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) {
4940                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR-SACK chunk, too small\n");
4941                                         break;
4942                                 }
4943                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
4944                                         /*-
4945                                          * If we have sent a shutdown-ack, we will pay no
4946                                          * attention to a sack sent in to us since
4947                                          * we don't care anymore.
4948                                          */
4949                                         break;
4950                                 }
4951                                 nr_sack = (struct sctp_nr_sack_chunk *)ch;
4952                                 flags = ch->chunk_flags;
4953                                 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack);
4954                                 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks);
4955                                 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks);
4956                                 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns);
4957                                 a_rwnd = (uint32_t) ntohl(nr_sack->nr_sack.a_rwnd);
4958                                 if (sizeof(struct sctp_nr_sack_chunk) +
4959                                     (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) +
4960                                     num_dup * sizeof(uint32_t) != chk_length) {
4961                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n");
4962                                         break;
4963                                 }
4964                                 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk);
4965                                 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
4966                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n",
4967                                     cum_ack, num_seg, a_rwnd);
4968                                 stcb->asoc.seen_a_sack_this_pkt = 1;
4969                                 if ((stcb->asoc.pr_sctp_cnt == 0) &&
4970                                     (num_seg == 0) && (num_nr_seg == 0) &&
4971                                     SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
4972                                     (stcb->asoc.saw_sack_with_frags == 0) &&
4973                                     (stcb->asoc.saw_sack_with_nr_frags == 0) &&
4974                                     (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
4975                                         /*
4976                                          * We have a SIMPLE sack having no
4977                                          * prior segments and data on sent
4978                                          * queue to be acked. Use the faster
4979                                          * path sack processing. We also
4980                                          * allow window update sacks with no
4981                                          * missing segments to go this way
4982                                          * too.
4983                                          */
4984                                         sctp_express_handle_sack(stcb, cum_ack, a_rwnd,
4985                                             &abort_now, ecne_seen);
4986                                 } else {
4987                                         if (netp && *netp)
4988                                                 sctp_handle_sack(m, offset_seg, offset_dup, stcb,
4989                                                     num_seg, num_nr_seg, num_dup, &abort_now, flags,
4990                                                     cum_ack, a_rwnd, ecne_seen);
4991                                 }
4992                                 if (abort_now) {
4993                                         /* ABORT signal from sack processing */
4994                                         *offset = length;
4995                                         return (NULL);
4996                                 }
4997                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
4998                                     TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
4999                                     (stcb->asoc.stream_queue_cnt == 0)) {
5000                                         sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
5001                                 }
5002                         }
5003                         break;
5004
5005                 case SCTP_HEARTBEAT_REQUEST:
5006                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n");
5007                         if ((stcb) && netp && *netp) {
5008                                 SCTP_STAT_INCR(sctps_recvheartbeat);
5009                                 sctp_send_heartbeat_ack(stcb, m, *offset,
5010                                     chk_length, *netp);
5011
5012                                 /* He's alive so give him credit */
5013                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5014                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5015                                             stcb->asoc.overall_error_count,
5016                                             0,
5017                                             SCTP_FROM_SCTP_INPUT,
5018                                             __LINE__);
5019                                 }
5020                                 stcb->asoc.overall_error_count = 0;
5021                         }
5022                         break;
5023                 case SCTP_HEARTBEAT_ACK:
5024                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT-ACK\n");
5025                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) {
5026                                 /* Its not ours */
5027                                 *offset = length;
5028                                 if (locked_tcb) {
5029                                         SCTP_TCB_UNLOCK(locked_tcb);
5030                                 }
5031                                 return (NULL);
5032                         }
5033                         /* He's alive so give him credit */
5034                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5035                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5036                                     stcb->asoc.overall_error_count,
5037                                     0,
5038                                     SCTP_FROM_SCTP_INPUT,
5039                                     __LINE__);
5040                         }
5041                         stcb->asoc.overall_error_count = 0;
5042                         SCTP_STAT_INCR(sctps_recvheartbeatack);
5043                         if (netp && *netp)
5044                                 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch,
5045                                     stcb, *netp);
5046                         break;
5047                 case SCTP_ABORT_ASSOCIATION:
5048                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n",
5049                             (void *)stcb);
5050                         if ((stcb) && netp && *netp)
5051                                 sctp_handle_abort((struct sctp_abort_chunk *)ch,
5052                                     stcb, *netp);
5053                         *offset = length;
5054                         return (NULL);
5055                         break;
5056                 case SCTP_SHUTDOWN:
5057                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n",
5058                             (void *)stcb);
5059                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) {
5060                                 *offset = length;
5061                                 if (locked_tcb) {
5062                                         SCTP_TCB_UNLOCK(locked_tcb);
5063                                 }
5064                                 return (NULL);
5065                         }
5066                         if (netp && *netp) {
5067                                 int abort_flag = 0;
5068
5069                                 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch,
5070                                     stcb, *netp, &abort_flag);
5071                                 if (abort_flag) {
5072                                         *offset = length;
5073                                         return (NULL);
5074                                 }
5075                         }
5076                         break;
5077                 case SCTP_SHUTDOWN_ACK:
5078                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-ACK, stcb %p\n", (void *)stcb);
5079                         if ((stcb) && (netp) && (*netp))
5080                                 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp);
5081                         *offset = length;
5082                         return (NULL);
5083                         break;
5084
5085                 case SCTP_OPERATION_ERROR:
5086                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP-ERR\n");
5087                         if ((stcb) && netp && *netp && sctp_handle_error(ch, stcb, *netp) < 0) {
5088                                 *offset = length;
5089                                 return (NULL);
5090                         }
5091                         break;
5092                 case SCTP_COOKIE_ECHO:
5093                         SCTPDBG(SCTP_DEBUG_INPUT3,
5094                             "SCTP_COOKIE-ECHO, stcb %p\n", (void *)stcb);
5095                         if ((stcb) && (stcb->asoc.total_output_queue_size)) {
5096                                 ;
5097                         } else {
5098                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5099                                         /* We are not interested anymore */
5100                         abend:
5101                                         if (stcb) {
5102                                                 SCTP_TCB_UNLOCK(stcb);
5103                                         }
5104                                         *offset = length;
5105                                         return (NULL);
5106                                 }
5107                         }
5108                         /*
5109                          * First are we accepting? We do this again here
5110                          * since it is possible that a previous endpoint WAS
5111                          * listening responded to a INIT-ACK and then
5112                          * closed. We opened and bound.. and are now no
5113                          * longer listening.
5114                          */
5115
5116                         if ((stcb == NULL) && (inp->sctp_socket->so_qlen >= inp->sctp_socket->so_qlimit)) {
5117                                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
5118                                     (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) {
5119                                         struct mbuf *op_err;
5120
5121                                         op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC);
5122                                         sctp_abort_association(inp, stcb, m, iphlen,
5123                                             src, dst, sh, op_err,
5124                                             use_mflowid, mflowid,
5125                                             vrf_id, port);
5126                                 }
5127                                 *offset = length;
5128                                 return (NULL);
5129                         } else {
5130                                 struct mbuf *ret_buf;
5131                                 struct sctp_inpcb *linp;
5132
5133                                 if (stcb) {
5134                                         linp = NULL;
5135                                 } else {
5136                                         linp = inp;
5137                                 }
5138
5139                                 if (linp) {
5140                                         SCTP_ASOC_CREATE_LOCK(linp);
5141                                         if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
5142                                             (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
5143                                                 SCTP_ASOC_CREATE_UNLOCK(linp);
5144                                                 goto abend;
5145                                         }
5146                                 }
5147                                 if (netp) {
5148                                         ret_buf =
5149                                             sctp_handle_cookie_echo(m, iphlen,
5150                                             *offset,
5151                                             src, dst,
5152                                             sh,
5153                                             (struct sctp_cookie_echo_chunk *)ch,
5154                                             &inp, &stcb, netp,
5155                                             auth_skipped,
5156                                             auth_offset,
5157                                             auth_len,
5158                                             &locked_tcb,
5159                                             use_mflowid,
5160                                             mflowid,
5161                                             vrf_id,
5162                                             port);
5163                                 } else {
5164                                         ret_buf = NULL;
5165                                 }
5166                                 if (linp) {
5167                                         SCTP_ASOC_CREATE_UNLOCK(linp);
5168                                 }
5169                                 if (ret_buf == NULL) {
5170                                         if (locked_tcb) {
5171                                                 SCTP_TCB_UNLOCK(locked_tcb);
5172                                         }
5173                                         SCTPDBG(SCTP_DEBUG_INPUT3,
5174                                             "GAK, null buffer\n");
5175                                         *offset = length;
5176                                         return (NULL);
5177                                 }
5178                                 /* if AUTH skipped, see if it verified... */
5179                                 if (auth_skipped) {
5180                                         got_auth = 1;
5181                                         auth_skipped = 0;
5182                                 }
5183                                 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) {
5184                                         /*
5185                                          * Restart the timer if we have
5186                                          * pending data
5187                                          */
5188                                         struct sctp_tmit_chunk *chk;
5189
5190                                         chk = TAILQ_FIRST(&stcb->asoc.sent_queue);
5191                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
5192                                 }
5193                         }
5194                         break;
5195                 case SCTP_COOKIE_ACK:
5196                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE-ACK, stcb %p\n", (void *)stcb);
5197                         if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) {
5198                                 if (locked_tcb) {
5199                                         SCTP_TCB_UNLOCK(locked_tcb);
5200                                 }
5201                                 return (NULL);
5202                         }
5203                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5204                                 /* We are not interested anymore */
5205                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
5206                                         ;
5207                                 } else if (stcb) {
5208 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5209                                         so = SCTP_INP_SO(inp);
5210                                         atomic_add_int(&stcb->asoc.refcnt, 1);
5211                                         SCTP_TCB_UNLOCK(stcb);
5212                                         SCTP_SOCKET_LOCK(so, 1);
5213                                         SCTP_TCB_LOCK(stcb);
5214                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
5215 #endif
5216                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27);
5217 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5218                                         SCTP_SOCKET_UNLOCK(so, 1);
5219 #endif
5220                                         *offset = length;
5221                                         return (NULL);
5222                                 }
5223                         }
5224                         /* He's alive so give him credit */
5225                         if ((stcb) && netp && *netp) {
5226                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5227                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5228                                             stcb->asoc.overall_error_count,
5229                                             0,
5230                                             SCTP_FROM_SCTP_INPUT,
5231                                             __LINE__);
5232                                 }
5233                                 stcb->asoc.overall_error_count = 0;
5234                                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp);
5235                         }
5236                         break;
5237                 case SCTP_ECN_ECHO:
5238                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-ECHO\n");
5239                         /* He's alive so give him credit */
5240                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) {
5241                                 /* Its not ours */
5242                                 if (locked_tcb) {
5243                                         SCTP_TCB_UNLOCK(locked_tcb);
5244                                 }
5245                                 *offset = length;
5246                                 return (NULL);
5247                         }
5248                         if (stcb) {
5249                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5250                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5251                                             stcb->asoc.overall_error_count,
5252                                             0,
5253                                             SCTP_FROM_SCTP_INPUT,
5254                                             __LINE__);
5255                                 }
5256                                 stcb->asoc.overall_error_count = 0;
5257                                 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch,
5258                                     stcb);
5259                                 ecne_seen = 1;
5260                         }
5261                         break;
5262                 case SCTP_ECN_CWR:
5263                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-CWR\n");
5264                         /* He's alive so give him credit */
5265                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) {
5266                                 /* Its not ours */
5267                                 if (locked_tcb) {
5268                                         SCTP_TCB_UNLOCK(locked_tcb);
5269                                 }
5270                                 *offset = length;
5271                                 return (NULL);
5272                         }
5273                         if (stcb) {
5274                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5275                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5276                                             stcb->asoc.overall_error_count,
5277                                             0,
5278                                             SCTP_FROM_SCTP_INPUT,
5279                                             __LINE__);
5280                                 }
5281                                 stcb->asoc.overall_error_count = 0;
5282                                 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp);
5283                         }
5284                         break;
5285                 case SCTP_SHUTDOWN_COMPLETE:
5286                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-COMPLETE, stcb %p\n", (void *)stcb);
5287                         /* must be first and only chunk */
5288                         if ((num_chunks > 1) ||
5289                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
5290                                 *offset = length;
5291                                 if (locked_tcb) {
5292                                         SCTP_TCB_UNLOCK(locked_tcb);
5293                                 }
5294                                 return (NULL);
5295                         }
5296                         if ((stcb) && netp && *netp) {
5297                                 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch,
5298                                     stcb, *netp);
5299                         }
5300                         *offset = length;
5301                         return (NULL);
5302                         break;
5303                 case SCTP_ASCONF:
5304                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n");
5305                         /* He's alive so give him credit */
5306                         if (stcb) {
5307                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5308                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5309                                             stcb->asoc.overall_error_count,
5310                                             0,
5311                                             SCTP_FROM_SCTP_INPUT,
5312                                             __LINE__);
5313                                 }
5314                                 stcb->asoc.overall_error_count = 0;
5315                                 sctp_handle_asconf(m, *offset, src,
5316                                     (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0);
5317                                 asconf_cnt++;
5318                         }
5319                         break;
5320                 case SCTP_ASCONF_ACK:
5321                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF-ACK\n");
5322                         if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) {
5323                                 /* Its not ours */
5324                                 if (locked_tcb) {
5325                                         SCTP_TCB_UNLOCK(locked_tcb);
5326                                 }
5327                                 *offset = length;
5328                                 return (NULL);
5329                         }
5330                         if ((stcb) && netp && *netp) {
5331                                 /* He's alive so give him credit */
5332                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5333                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5334                                             stcb->asoc.overall_error_count,
5335                                             0,
5336                                             SCTP_FROM_SCTP_INPUT,
5337                                             __LINE__);
5338                                 }
5339                                 stcb->asoc.overall_error_count = 0;
5340                                 sctp_handle_asconf_ack(m, *offset,
5341                                     (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock);
5342                                 if (abort_no_unlock)
5343                                         return (NULL);
5344                         }
5345                         break;
5346                 case SCTP_FORWARD_CUM_TSN:
5347                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD-TSN\n");
5348                         if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) {
5349                                 /* Its not ours */
5350                                 if (locked_tcb) {
5351                                         SCTP_TCB_UNLOCK(locked_tcb);
5352                                 }
5353                                 *offset = length;
5354                                 return (NULL);
5355                         }
5356                         /* He's alive so give him credit */
5357                         if (stcb) {
5358                                 int abort_flag = 0;
5359
5360                                 stcb->asoc.overall_error_count = 0;
5361                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5362                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5363                                             stcb->asoc.overall_error_count,
5364                                             0,
5365                                             SCTP_FROM_SCTP_INPUT,
5366                                             __LINE__);
5367                                 }
5368                                 *fwd_tsn_seen = 1;
5369                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5370                                         /* We are not interested anymore */
5371 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5372                                         so = SCTP_INP_SO(inp);
5373                                         atomic_add_int(&stcb->asoc.refcnt, 1);
5374                                         SCTP_TCB_UNLOCK(stcb);
5375                                         SCTP_SOCKET_LOCK(so, 1);
5376                                         SCTP_TCB_LOCK(stcb);
5377                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
5378 #endif
5379                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_29);
5380 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5381                                         SCTP_SOCKET_UNLOCK(so, 1);
5382 #endif
5383                                         *offset = length;
5384                                         return (NULL);
5385                                 }
5386                                 sctp_handle_forward_tsn(stcb,
5387                                     (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset);
5388                                 if (abort_flag) {
5389                                         *offset = length;
5390                                         return (NULL);
5391                                 } else {
5392                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5393                                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5394                                                     stcb->asoc.overall_error_count,
5395                                                     0,
5396                                                     SCTP_FROM_SCTP_INPUT,
5397                                                     __LINE__);
5398                                         }
5399                                         stcb->asoc.overall_error_count = 0;
5400                                 }
5401
5402                         }
5403                         break;
5404                 case SCTP_STREAM_RESET:
5405                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n");
5406                         if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) {
5407                                 /* Its not ours */
5408                                 if (locked_tcb) {
5409                                         SCTP_TCB_UNLOCK(locked_tcb);
5410                                 }
5411                                 *offset = length;
5412                                 return (NULL);
5413                         }
5414                         if (stcb->asoc.peer_supports_strreset == 0) {
5415                                 /*
5416                                  * hmm, peer should have announced this, but
5417                                  * we will turn it on since he is sending us
5418                                  * a stream reset.
5419                                  */
5420                                 stcb->asoc.peer_supports_strreset = 1;
5421                         }
5422                         if (sctp_handle_stream_reset(stcb, m, *offset, ch)) {
5423                                 /* stop processing */
5424                                 *offset = length;
5425                                 return (NULL);
5426                         }
5427                         break;
5428                 case SCTP_PACKET_DROPPED:
5429                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n");
5430                         /* re-get it all please */
5431                         if (chk_length < sizeof(struct sctp_pktdrop_chunk)) {
5432                                 /* Its not ours */
5433                                 if (locked_tcb) {
5434                                         SCTP_TCB_UNLOCK(locked_tcb);
5435                                 }
5436                                 *offset = length;
5437                                 return (NULL);
5438                         }
5439                         if (ch && (stcb) && netp && (*netp)) {
5440                                 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch,
5441                                     stcb, *netp,
5442                                     min(chk_length, (sizeof(chunk_buf) - 4)));
5443
5444                         }
5445                         break;
5446
5447                 case SCTP_AUTHENTICATION:
5448                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n");
5449                         if (SCTP_BASE_SYSCTL(sctp_auth_disable))
5450                                 goto unknown_chunk;
5451
5452                         if (stcb == NULL) {
5453                                 /* save the first AUTH for later processing */
5454                                 if (auth_skipped == 0) {
5455                                         auth_offset = *offset;
5456                                         auth_len = chk_length;
5457                                         auth_skipped = 1;
5458                                 }
5459                                 /* skip this chunk (temporarily) */
5460                                 goto next_chunk;
5461                         }
5462                         if ((chk_length < (sizeof(struct sctp_auth_chunk))) ||
5463                             (chk_length > (sizeof(struct sctp_auth_chunk) +
5464                             SCTP_AUTH_DIGEST_LEN_MAX))) {
5465                                 /* Its not ours */
5466                                 if (locked_tcb) {
5467                                         SCTP_TCB_UNLOCK(locked_tcb);
5468                                 }
5469                                 *offset = length;
5470                                 return (NULL);
5471                         }
5472                         if (got_auth == 1) {
5473                                 /* skip this chunk... it's already auth'd */
5474                                 goto next_chunk;
5475                         }
5476                         got_auth = 1;
5477                         if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch,
5478                             m, *offset)) {
5479                                 /* auth HMAC failed so dump the packet */
5480                                 *offset = length;
5481                                 return (stcb);
5482                         } else {
5483                                 /* remaining chunks are HMAC checked */
5484                                 stcb->asoc.authenticated = 1;
5485                         }
5486                         break;
5487
5488                 default:
5489         unknown_chunk:
5490                         /* it's an unknown chunk! */
5491                         if ((ch->chunk_type & 0x40) && (stcb != NULL)) {
5492                                 struct mbuf *mm;
5493                                 struct sctp_paramhdr *phd;
5494
5495                                 mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
5496                                     0, M_DONTWAIT, 1, MT_DATA);
5497                                 if (mm) {
5498                                         phd = mtod(mm, struct sctp_paramhdr *);
5499                                         /*
5500                                          * We cheat and use param type since
5501                                          * we did not bother to define a
5502                                          * error cause struct. They are the
5503                                          * same basic format with different
5504                                          * names.
5505                                          */
5506                                         phd->param_type = htons(SCTP_CAUSE_UNRECOG_CHUNK);
5507                                         phd->param_length = htons(chk_length + sizeof(*phd));
5508                                         SCTP_BUF_LEN(mm) = sizeof(*phd);
5509                                         SCTP_BUF_NEXT(mm) = SCTP_M_COPYM(m, *offset, chk_length, M_DONTWAIT);
5510                                         if (SCTP_BUF_NEXT(mm)) {
5511                                                 if (sctp_pad_lastmbuf(SCTP_BUF_NEXT(mm), SCTP_SIZE32(chk_length) - chk_length, NULL)) {
5512                                                         sctp_m_freem(mm);
5513                                                 } else {
5514 #ifdef SCTP_MBUF_LOGGING
5515                                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5516                                                                 struct mbuf *mat;
5517
5518                                                                 for (mat = SCTP_BUF_NEXT(mm); mat; mat = SCTP_BUF_NEXT(mat)) {
5519                                                                         if (SCTP_BUF_IS_EXTENDED(mat)) {
5520                                                                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
5521                                                                         }
5522                                                                 }
5523                                                         }
5524 #endif
5525                                                         sctp_queue_op_err(stcb, mm);
5526                                                 }
5527                                         } else {
5528                                                 sctp_m_freem(mm);
5529                                         }
5530                                 }
5531                         }
5532                         if ((ch->chunk_type & 0x80) == 0) {
5533                                 /* discard this packet */
5534                                 *offset = length;
5535                                 return (stcb);
5536                         }       /* else skip this bad chunk and continue... */
5537                         break;
5538                 }               /* switch (ch->chunk_type) */
5539
5540
5541 next_chunk:
5542                 /* get the next chunk */
5543                 *offset += SCTP_SIZE32(chk_length);
5544                 if (*offset >= length) {
5545                         /* no more data left in the mbuf chain */
5546                         break;
5547                 }
5548                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
5549                     sizeof(struct sctp_chunkhdr), chunk_buf);
5550                 if (ch == NULL) {
5551                         if (locked_tcb) {
5552                                 SCTP_TCB_UNLOCK(locked_tcb);
5553                         }
5554                         *offset = length;
5555                         return (NULL);
5556                 }
5557         }                       /* while */
5558
5559         if (asconf_cnt > 0 && stcb != NULL) {
5560                 sctp_send_asconf_ack(stcb);
5561         }
5562         return (stcb);
5563 }
5564
5565
5566 #ifdef INVARIANTS
5567 #ifdef __GNUC__
5568 __attribute__((noinline))
5569 #endif
5570         void
5571              sctp_validate_no_locks(struct sctp_inpcb *inp)
5572 {
5573         struct sctp_tcb *lstcb;
5574
5575         LIST_FOREACH(lstcb, &inp->sctp_asoc_list, sctp_tcblist) {
5576                 if (mtx_owned(&lstcb->tcb_mtx)) {
5577                         panic("Own lock on stcb at return from input");
5578                 }
5579         }
5580         if (mtx_owned(&inp->inp_create_mtx)) {
5581                 panic("Own create lock on inp");
5582         }
5583         if (mtx_owned(&inp->inp_mtx)) {
5584                 panic("Own inp lock on inp");
5585         }
5586 }
5587
5588 #endif
5589
5590 /*
5591  * common input chunk processing (v4 and v6)
5592  */
5593 void
5594 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length,
5595     struct sockaddr *src, struct sockaddr *dst,
5596     struct sctphdr *sh, struct sctp_chunkhdr *ch,
5597 #if !defined(SCTP_WITH_NO_CSUM)
5598     uint8_t compute_crc,
5599 #endif
5600     uint8_t ecn_bits,
5601     uint8_t use_mflowid, uint32_t mflowid,
5602     uint32_t vrf_id, uint16_t port)
5603 {
5604         uint32_t high_tsn;
5605         int fwd_tsn_seen = 0, data_processed = 0;
5606         struct mbuf *m = *mm;
5607         int un_sent;
5608         int cnt_ctrl_ready = 0;
5609         struct sctp_inpcb *inp = NULL, *inp_decr = NULL;
5610         struct sctp_tcb *stcb = NULL;
5611         struct sctp_nets *net = NULL;
5612
5613         SCTP_STAT_INCR(sctps_recvdatagrams);
5614 #ifdef SCTP_AUDITING_ENABLED
5615         sctp_audit_log(0xE0, 1);
5616         sctp_auditing(0, inp, stcb, net);
5617 #endif
5618 #if !defined(SCTP_WITH_NO_CSUM)
5619         if (compute_crc != 0) {
5620                 uint32_t check, calc_check;
5621
5622                 check = sh->checksum;
5623                 sh->checksum = 0;
5624                 calc_check = sctp_calculate_cksum(m, iphlen);
5625                 sh->checksum = check;
5626                 if (calc_check != check) {
5627                         SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x  m:%p mlen:%d iphlen:%d\n",
5628                             calc_check, check, (void *)m, length, iphlen);
5629                         stcb = sctp_findassociation_addr(m, offset, src, dst,
5630                             sh, ch, &inp, &net, vrf_id);
5631                         if ((net != NULL) && (port != 0)) {
5632                                 if (net->port == 0) {
5633                                         sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr));
5634                                 }
5635                                 net->port = port;
5636                         }
5637                         if ((net != NULL) && (use_mflowid != 0)) {
5638                                 net->flowid = mflowid;
5639 #ifdef INVARIANTS
5640                                 net->flowidset = 1;
5641 #endif
5642                         }
5643                         if ((inp != NULL) && (stcb != NULL)) {
5644                                 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1);
5645                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED);
5646                         } else if ((inp != NULL) && (stcb == NULL)) {
5647                                 inp_decr = inp;
5648                         }
5649                         SCTP_STAT_INCR(sctps_badsum);
5650                         SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors);
5651                         goto out;
5652                 }
5653         }
5654 #endif
5655         /* Destination port of 0 is illegal, based on RFC4960. */
5656         if (sh->dest_port == 0) {
5657                 SCTP_STAT_INCR(sctps_hdrops);
5658                 goto out;
5659         }
5660         stcb = sctp_findassociation_addr(m, offset, src, dst,
5661             sh, ch, &inp, &net, vrf_id);
5662         if ((net != NULL) && (port != 0)) {
5663                 if (net->port == 0) {
5664                         sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr));
5665                 }
5666                 net->port = port;
5667         }
5668         if ((net != NULL) && (use_mflowid != 0)) {
5669                 net->flowid = mflowid;
5670 #ifdef INVARIANTS
5671                 net->flowidset = 1;
5672 #endif
5673         }
5674         if (inp == NULL) {
5675                 SCTP_STAT_INCR(sctps_noport);
5676                 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) {
5677                         goto out;
5678                 }
5679                 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
5680                         sctp_send_shutdown_complete2(src, dst, sh,
5681                             use_mflowid, mflowid,
5682                             vrf_id, port);
5683                         goto out;
5684                 }
5685                 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) {
5686                         goto out;
5687                 }
5688                 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) {
5689                         if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) ||
5690                             ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) &&
5691                             (ch->chunk_type != SCTP_INIT))) {
5692                                 sctp_send_abort(m, iphlen, src, dst,
5693                                     sh, 0, NULL,
5694                                     use_mflowid, mflowid,
5695                                     vrf_id, port);
5696                         }
5697                 }
5698                 goto out;
5699         } else if (stcb == NULL) {
5700                 inp_decr = inp;
5701         }
5702 #ifdef IPSEC
5703         /*-
5704          * I very much doubt any of the IPSEC stuff will work but I have no
5705          * idea, so I will leave it in place.
5706          */
5707         if (inp != NULL) {
5708                 switch (dst->sa_family) {
5709 #ifdef INET
5710                 case AF_INET:
5711                         if (ipsec4_in_reject(m, &inp->ip_inp.inp)) {
5712                                 MODULE_GLOBAL(ipsec4stat).in_polvio++;
5713                                 SCTP_STAT_INCR(sctps_hdrops);
5714                                 goto out;
5715                         }
5716                         break;
5717 #endif
5718 #ifdef INET6
5719                 case AF_INET6:
5720                         if (ipsec6_in_reject(m, &inp->ip_inp.inp)) {
5721                                 MODULE_GLOBAL(ipsec6stat).in_polvio++;
5722                                 SCTP_STAT_INCR(sctps_hdrops);
5723                                 goto out;
5724                         }
5725                         break;
5726 #endif
5727                 default:
5728                         break;
5729                 }
5730         }
5731 #endif
5732         SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n",
5733             (void *)m, iphlen, offset, length, (void *)stcb);
5734         if (stcb) {
5735                 /* always clear this before beginning a packet */
5736                 stcb->asoc.authenticated = 0;
5737                 stcb->asoc.seen_a_sack_this_pkt = 0;
5738                 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n",
5739                     (void *)stcb, stcb->asoc.state);
5740
5741                 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) ||
5742                     (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) {
5743                         /*-
5744                          * If we hit here, we had a ref count
5745                          * up when the assoc was aborted and the
5746                          * timer is clearing out the assoc, we should
5747                          * NOT respond to any packet.. its OOTB.
5748                          */
5749                         SCTP_TCB_UNLOCK(stcb);
5750                         stcb = NULL;
5751                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp,
5752                             use_mflowid, mflowid,
5753                             vrf_id, port);
5754                         goto out;
5755                 }
5756         }
5757         if (IS_SCTP_CONTROL(ch)) {
5758                 /* process the control portion of the SCTP packet */
5759                 /* sa_ignore NO_NULL_CHK */
5760                 stcb = sctp_process_control(m, iphlen, &offset, length,
5761                     src, dst, sh, ch,
5762                     inp, stcb, &net, &fwd_tsn_seen,
5763                     use_mflowid, mflowid,
5764                     vrf_id, port);
5765                 if (stcb) {
5766                         /*
5767                          * This covers us if the cookie-echo was there and
5768                          * it changes our INP.
5769                          */
5770                         inp = stcb->sctp_ep;
5771                         if ((net) && (port)) {
5772                                 if (net->port == 0) {
5773                                         sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr));
5774                                 }
5775                                 net->port = port;
5776                         }
5777                 }
5778         } else {
5779                 /*
5780                  * no control chunks, so pre-process DATA chunks (these
5781                  * checks are taken care of by control processing)
5782                  */
5783
5784                 /*
5785                  * if DATA only packet, and auth is required, then punt...
5786                  * can't have authenticated without any AUTH (control)
5787                  * chunks
5788                  */
5789                 if ((stcb != NULL) &&
5790                     !SCTP_BASE_SYSCTL(sctp_auth_disable) &&
5791                     sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) {
5792                         /* "silently" ignore */
5793                         SCTP_STAT_INCR(sctps_recvauthmissing);
5794                         goto out;
5795                 }
5796                 if (stcb == NULL) {
5797                         /* out of the blue DATA chunk */
5798                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp,
5799                             use_mflowid, mflowid,
5800                             vrf_id, port);
5801                         goto out;
5802                 }
5803                 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) {
5804                         /* v_tag mismatch! */
5805                         SCTP_STAT_INCR(sctps_badvtag);
5806                         goto out;
5807                 }
5808         }
5809
5810         if (stcb == NULL) {
5811                 /*
5812                  * no valid TCB for this packet, or we found it's a bad
5813                  * packet while processing control, or we're done with this
5814                  * packet (done or skip rest of data), so we drop it...
5815                  */
5816                 goto out;
5817         }
5818         /*
5819          * DATA chunk processing
5820          */
5821         /* plow through the data chunks while length > offset */
5822
5823         /*
5824          * Rest should be DATA only.  Check authentication state if AUTH for
5825          * DATA is required.
5826          */
5827         if ((length > offset) &&
5828             (stcb != NULL) &&
5829             !SCTP_BASE_SYSCTL(sctp_auth_disable) &&
5830             sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) &&
5831             !stcb->asoc.authenticated) {
5832                 /* "silently" ignore */
5833                 SCTP_STAT_INCR(sctps_recvauthmissing);
5834                 SCTPDBG(SCTP_DEBUG_AUTH1,
5835                     "Data chunk requires AUTH, skipped\n");
5836                 goto trigger_send;
5837         }
5838         if (length > offset) {
5839                 int retval;
5840
5841                 /*
5842                  * First check to make sure our state is correct. We would
5843                  * not get here unless we really did have a tag, so we don't
5844                  * abort if this happens, just dump the chunk silently.
5845                  */
5846                 switch (SCTP_GET_STATE(&stcb->asoc)) {
5847                 case SCTP_STATE_COOKIE_ECHOED:
5848                         /*
5849                          * we consider data with valid tags in this state
5850                          * shows us the cookie-ack was lost. Imply it was
5851                          * there.
5852                          */
5853                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5854                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5855                                     stcb->asoc.overall_error_count,
5856                                     0,
5857                                     SCTP_FROM_SCTP_INPUT,
5858                                     __LINE__);
5859                         }
5860                         stcb->asoc.overall_error_count = 0;
5861                         sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net);
5862                         break;
5863                 case SCTP_STATE_COOKIE_WAIT:
5864                         /*
5865                          * We consider OOTB any data sent during asoc setup.
5866                          */
5867                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp,
5868                             use_mflowid, mflowid,
5869                             vrf_id, port);
5870                         goto out;
5871                         /* sa_ignore NOTREACHED */
5872                         break;
5873                 case SCTP_STATE_EMPTY:  /* should not happen */
5874                 case SCTP_STATE_INUSE:  /* should not happen */
5875                 case SCTP_STATE_SHUTDOWN_RECEIVED:      /* This is a peer error */
5876                 case SCTP_STATE_SHUTDOWN_ACK_SENT:
5877                 default:
5878                         goto out;
5879                         /* sa_ignore NOTREACHED */
5880                         break;
5881                 case SCTP_STATE_OPEN:
5882                 case SCTP_STATE_SHUTDOWN_SENT:
5883                         break;
5884                 }
5885                 /* plow through the data chunks while length > offset */
5886                 retval = sctp_process_data(mm, iphlen, &offset, length,
5887                     src, dst, sh,
5888                     inp, stcb, net, &high_tsn,
5889                     use_mflowid, mflowid,
5890                     vrf_id, port);
5891                 if (retval == 2) {
5892                         /*
5893                          * The association aborted, NO UNLOCK needed since
5894                          * the association is destroyed.
5895                          */
5896                         stcb = NULL;
5897                         goto out;
5898                 }
5899                 data_processed = 1;
5900                 /*
5901                  * Anything important needs to have been m_copy'ed in
5902                  * process_data
5903                  */
5904         }
5905         /* take care of ecn */
5906         if ((data_processed == 1) &&
5907             (stcb->asoc.ecn_allowed == 1) &&
5908             ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) {
5909                 /* Yep, we need to add a ECNE */
5910                 sctp_send_ecn_echo(stcb, net, high_tsn);
5911         }
5912         if ((data_processed == 0) && (fwd_tsn_seen)) {
5913                 int was_a_gap;
5914                 uint32_t highest_tsn;
5915
5916                 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) {
5917                         highest_tsn = stcb->asoc.highest_tsn_inside_nr_map;
5918                 } else {
5919                         highest_tsn = stcb->asoc.highest_tsn_inside_map;
5920                 }
5921                 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn);
5922                 stcb->asoc.send_sack = 1;
5923                 sctp_sack_check(stcb, was_a_gap);
5924         } else if (fwd_tsn_seen) {
5925                 stcb->asoc.send_sack = 1;
5926         }
5927         /* trigger send of any chunks in queue... */
5928 trigger_send:
5929 #ifdef SCTP_AUDITING_ENABLED
5930         sctp_audit_log(0xE0, 2);
5931         sctp_auditing(1, inp, stcb, net);
5932 #endif
5933         SCTPDBG(SCTP_DEBUG_INPUT1,
5934             "Check for chunk output prw:%d tqe:%d tf=%d\n",
5935             stcb->asoc.peers_rwnd,
5936             TAILQ_EMPTY(&stcb->asoc.control_send_queue),
5937             stcb->asoc.total_flight);
5938         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
5939         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
5940                 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq;
5941         }
5942         if (cnt_ctrl_ready ||
5943             ((un_sent) &&
5944             (stcb->asoc.peers_rwnd > 0 ||
5945             (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) {
5946                 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n");
5947                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
5948                 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n");
5949         }
5950 #ifdef SCTP_AUDITING_ENABLED
5951         sctp_audit_log(0xE0, 3);
5952         sctp_auditing(2, inp, stcb, net);
5953 #endif
5954 out:
5955         if (stcb != NULL) {
5956                 SCTP_TCB_UNLOCK(stcb);
5957         }
5958         if (inp_decr != NULL) {
5959                 /* reduce ref-count */
5960                 SCTP_INP_WLOCK(inp_decr);
5961                 SCTP_INP_DECR_REF(inp_decr);
5962                 SCTP_INP_WUNLOCK(inp_decr);
5963         }
5964 #ifdef INVARIANTS
5965         if (inp != NULL) {
5966                 sctp_validate_no_locks(inp);
5967         }
5968 #endif
5969         return;
5970 }
5971
5972 #if 0
5973 static void
5974 sctp_print_mbuf_chain(struct mbuf *m)
5975 {
5976         for (; m; m = SCTP_BUF_NEXT(m)) {
5977                 SCTP_PRINTF("%p: m_len = %ld\n", (void *)m, SCTP_BUF_LEN(m));
5978                 if (SCTP_BUF_IS_EXTENDED(m))
5979                         SCTP_PRINTF("%p: extend_size = %d\n", (void *)m, SCTP_BUF_EXTEND_SIZE(m));
5980         }
5981 }
5982
5983 #endif
5984
5985 #ifdef INET
5986 void
5987 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port)
5988 {
5989         struct mbuf *m;
5990         int iphlen;
5991         uint32_t vrf_id = 0;
5992         uint8_t ecn_bits;
5993         struct sockaddr_in src, dst;
5994         struct ip *ip;
5995         struct sctphdr *sh;
5996         struct sctp_chunkhdr *ch;
5997         int length, offset;
5998
5999 #if !defined(SCTP_WITH_NO_CSUM)
6000         uint8_t compute_crc;
6001
6002 #endif
6003         uint32_t mflowid;
6004         uint8_t use_mflowid;
6005
6006         iphlen = off;
6007         if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) {
6008                 SCTP_RELEASE_PKT(i_pak);
6009                 return;
6010         }
6011         m = SCTP_HEADER_TO_CHAIN(i_pak);
6012 #ifdef SCTP_MBUF_LOGGING
6013         /* Log in any input mbufs */
6014         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6015                 struct mbuf *mat;
6016
6017                 for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
6018                         if (SCTP_BUF_IS_EXTENDED(mat)) {
6019                                 sctp_log_mb(mat, SCTP_MBUF_INPUT);
6020                         }
6021                 }
6022         }
6023 #endif
6024 #ifdef SCTP_PACKET_LOGGING
6025         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
6026                 sctp_packet_log(m);
6027         }
6028 #endif
6029         SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
6030             "sctp_input(): Packet of length %d received on %s with csum_flags 0x%x.\n",
6031             m->m_pkthdr.len,
6032             if_name(m->m_pkthdr.rcvif),
6033             m->m_pkthdr.csum_flags);
6034         if (m->m_flags & M_FLOWID) {
6035                 mflowid = m->m_pkthdr.flowid;
6036                 use_mflowid = 1;
6037         } else {
6038                 mflowid = 0;
6039                 use_mflowid = 0;
6040         }
6041         SCTP_STAT_INCR(sctps_recvpackets);
6042         SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
6043         /* Get IP, SCTP, and first chunk header together in the first mbuf. */
6044         offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
6045         if (SCTP_BUF_LEN(m) < offset) {
6046                 if ((m = m_pullup(m, offset)) == NULL) {
6047                         SCTP_STAT_INCR(sctps_hdrops);
6048                         return;
6049                 }
6050         }
6051         ip = mtod(m, struct ip *);
6052         sh = (struct sctphdr *)((caddr_t)ip + iphlen);
6053         ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr));
6054         offset -= sizeof(struct sctp_chunkhdr);
6055         memset(&src, 0, sizeof(struct sockaddr_in));
6056         src.sin_family = AF_INET;
6057         src.sin_len = sizeof(struct sockaddr_in);
6058         src.sin_port = sh->src_port;
6059         src.sin_addr = ip->ip_src;
6060         memset(&dst, 0, sizeof(struct sockaddr_in));
6061         dst.sin_family = AF_INET;
6062         dst.sin_len = sizeof(struct sockaddr_in);
6063         dst.sin_port = sh->dest_port;
6064         dst.sin_addr = ip->ip_dst;
6065         length = ip->ip_len + iphlen;
6066         /* Validate mbuf chain length with IP payload length. */
6067         if (SCTP_HEADER_LEN(m) != length) {
6068                 SCTPDBG(SCTP_DEBUG_INPUT1,
6069                     "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m));
6070                 SCTP_STAT_INCR(sctps_hdrops);
6071                 goto out;
6072         }
6073         /* SCTP does not allow broadcasts or multicasts */
6074         if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) {
6075                 goto out;
6076         }
6077         if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) {
6078                 goto out;
6079         }
6080         ecn_bits = ip->ip_tos;
6081 #if defined(SCTP_WITH_NO_CSUM)
6082         SCTP_STAT_INCR(sctps_recvnocrc);
6083 #else
6084         if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
6085                 SCTP_STAT_INCR(sctps_recvhwcrc);
6086                 compute_crc = 0;
6087         } else {
6088                 SCTP_STAT_INCR(sctps_recvswcrc);
6089                 compute_crc = 1;
6090         }
6091 #endif
6092         sctp_common_input_processing(&m, iphlen, offset, length,
6093             (struct sockaddr *)&src,
6094             (struct sockaddr *)&dst,
6095             sh, ch,
6096 #if !defined(SCTP_WITH_NO_CSUM)
6097             compute_crc,
6098 #endif
6099             ecn_bits,
6100             use_mflowid, mflowid,
6101             vrf_id, port);
6102 out:
6103         if (m) {
6104                 sctp_m_freem(m);
6105         }
6106         return;
6107 }
6108
6109 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
6110 extern int *sctp_cpuarry;
6111
6112 #endif
6113
6114 void
6115 sctp_input(struct mbuf *m, int off)
6116 {
6117 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
6118         struct ip *ip;
6119         struct sctphdr *sh;
6120         int offset;
6121         int cpu_to_use;
6122         uint32_t flowid, tag;
6123
6124         if (mp_ncpus > 1) {
6125                 if (m->m_flags & M_FLOWID) {
6126                         flowid = m->m_pkthdr.flowid;
6127                 } else {
6128                         /*
6129                          * No flow id built by lower layers fix it so we
6130                          * create one.
6131                          */
6132                         offset = off + sizeof(struct sctphdr);
6133                         if (SCTP_BUF_LEN(m) < offset) {
6134                                 if ((m = m_pullup(m, offset)) == NULL) {
6135                                         SCTP_STAT_INCR(sctps_hdrops);
6136                                         return;
6137                                 }
6138                         }
6139                         ip = mtod(m, struct ip *);
6140                         sh = (struct sctphdr *)((caddr_t)ip + off);
6141                         tag = htonl(sh->v_tag);
6142                         flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port);
6143                         m->m_pkthdr.flowid = flowid;
6144                         m->m_flags |= M_FLOWID;
6145                 }
6146                 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus];
6147                 sctp_queue_to_mcore(m, off, cpu_to_use);
6148                 return;
6149         }
6150 #endif
6151         sctp_input_with_port(m, off, 0);
6152 }
6153
6154 #endif