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 #if defined(INET) || defined(INET6)
  51 #include <netinet/udp.h>
  52 #endif
  53 #include <sys/smp.h>
  54
  55
  56
  57 static void
  58 sctp_stop_all_cookie_timers(struct sctp_tcb *stcb)
  59 {
  60         struct sctp_nets *net;
  61
  62         /*
  63          * This now not only stops all cookie timers it also stops any INIT
  64          * timers as well. This will make sure that the timers are stopped
  65          * in all collision cases.
  66          */
  67         SCTP_TCB_LOCK_ASSERT(stcb);
  68         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
  69                 if (net->rxt_timer.type == SCTP_TIMER_TYPE_COOKIE) {
  70                         sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE,
  71                             stcb->sctp_ep,
  72                             stcb,
  73                             net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_1);
  74                 } else if (net->rxt_timer.type == SCTP_TIMER_TYPE_INIT) {
  75                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT,
  76                             stcb->sctp_ep,
  77                             stcb,
  78                             net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_2);
  79                 }
  80         }
  81 }
  82
  83 /* INIT handler */
  84 static void
  85 sctp_handle_init(struct mbuf *m, int iphlen, int offset,
  86     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
  87     struct sctp_init_chunk *cp, struct sctp_inpcb *inp,
  88     struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_no_unlock,
  89     uint8_t mflowtype, uint32_t mflowid,
  90     uint32_t vrf_id, uint16_t port)
  91 {
  92         struct sctp_init *init;
  93         struct mbuf *op_err;
  94
  95         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_init: handling INIT tcb:%p\n",
  96             (void *)stcb);
  97         if (stcb == NULL) {
  98                 SCTP_INP_RLOCK(inp);
  99         }
 100         /* validate length */
 101         if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_chunk)) {
 102                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 103                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 104                     mflowtype, mflowid,
 105                     vrf_id, port);
 106                 if (stcb)
 107                         *abort_no_unlock = 1;
 108                 goto outnow;
 109         }
 110         /* validate parameters */
 111         init = &cp->init;
 112         if (init->initiate_tag == 0) {
 113                 /* protocol error... send abort */
 114                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 115                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 116                     mflowtype, mflowid,
 117                     vrf_id, port);
 118                 if (stcb)
 119                         *abort_no_unlock = 1;
 120                 goto outnow;
 121         }
 122         if (ntohl(init->a_rwnd) < SCTP_MIN_RWND) {
 123                 /* invalid parameter... send abort */
 124                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 125                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 126                     mflowtype, mflowid,
 127                     vrf_id, port);
 128                 if (stcb)
 129                         *abort_no_unlock = 1;
 130                 goto outnow;
 131         }
 132         if (init->num_inbound_streams == 0) {
 133                 /* protocol error... send abort */
 134                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 135                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 136                     mflowtype, mflowid,
 137                     vrf_id, port);
 138                 if (stcb)
 139                         *abort_no_unlock = 1;
 140                 goto outnow;
 141         }
 142         if (init->num_outbound_streams == 0) {
 143                 /* protocol error... send abort */
 144                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 145                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 146                     mflowtype, mflowid,
 147                     vrf_id, port);
 148                 if (stcb)
 149                         *abort_no_unlock = 1;
 150                 goto outnow;
 151         }
 152         if (sctp_validate_init_auth_params(m, offset + sizeof(*cp),
 153             offset + ntohs(cp->ch.chunk_length))) {
 154                 /* auth parameter(s) error... send abort */
 155                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 156                     "Problem with AUTH parameters");
 157                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 158                     mflowtype, mflowid,
 159                     vrf_id, port);
 160                 if (stcb)
 161                         *abort_no_unlock = 1;
 162                 goto outnow;
 163         }
 164         /* We are only accepting if we have a socket with positive
 165          * so_qlimit. */
 166         if ((stcb == NULL) &&
 167             ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
 168             (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) ||
 169             (inp->sctp_socket == NULL) ||
 170             (inp->sctp_socket->so_qlimit == 0))) {
 171                 /*
 172                  * FIX ME ?? What about TCP model and we have a
 173                  * match/restart case? Actually no fix is needed. the lookup
 174                  * will always find the existing assoc so stcb would not be
 175                  * NULL. It may be questionable to do this since we COULD
 176                  * just send back the INIT-ACK and hope that the app did
 177                  * accept()'s by the time the COOKIE was sent. But there is
 178                  * a price to pay for COOKIE generation and I don't want to
 179                  * pay it on the chance that the app will actually do some
 180                  * accepts(). The App just looses and should NOT be in this
 181                  * state :-)
 182                  */
 183                 if (SCTP_BASE_SYSCTL(sctp_blackhole) == 0) {
 184                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 185                             "No listener");
 186                         sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err,
 187                             mflowtype, mflowid, inp->fibnum,
 188                             vrf_id, port);
 189                 }
 190                 goto outnow;
 191         }
 192         if ((stcb != NULL) &&
 193             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT)) {
 194                 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending SHUTDOWN-ACK\n");
 195                 sctp_send_shutdown_ack(stcb, NULL);
 196                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
 197         } else {
 198                 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n");
 199                 sctp_send_initiate_ack(inp, stcb, net, m, iphlen, offset,
 200                     src, dst, sh, cp,
 201                     mflowtype, mflowid,
 202                     vrf_id, port,
 203                     ((stcb == NULL) ? SCTP_HOLDS_LOCK : SCTP_NOT_LOCKED));
 204         }
 205 outnow:
 206         if (stcb == NULL) {
 207                 SCTP_INP_RUNLOCK(inp);
 208         }
 209 }
 210
 211 /*
 212  * process peer "INIT/INIT-ACK" chunk returns value < 0 on error
 213  */
 214
 215 int
 216 sctp_is_there_unsent_data(struct sctp_tcb *stcb, int so_locked
 217 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
 218     SCTP_UNUSED
 219 #endif
 220 )
 221 {
 222         int unsent_data;
 223         unsigned int i;
 224         struct sctp_stream_queue_pending *sp;
 225         struct sctp_association *asoc;
 226
 227         /*
 228          * This function returns if any stream has true unsent data on it.
 229          * Note that as it looks through it will clean up any places that
 230          * have old data that has been sent but left at top of stream queue.
 231          */
 232         asoc = &stcb->asoc;
 233         unsent_data = 0;
 234         SCTP_TCB_SEND_LOCK(stcb);
 235         if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
 236                 /* Check to see if some data queued */
 237                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
 238                         /* sa_ignore FREED_MEMORY */
 239                         sp = TAILQ_FIRST(&stcb->asoc.strmout[i].outqueue);
 240                         if (sp == NULL) {
 241                                 continue;
 242                         }
 243                         if ((sp->msg_is_complete) &&
 244                             (sp->length == 0) &&
 245                             (sp->sender_all_done)) {
 246                                 /*
 247                                  * We are doing differed cleanup. Last time
 248                                  * through when we took all the data the
 249                                  * sender_all_done was not set.
 250                                  */
 251                                 if (sp->put_last_out == 0) {
 252                                         SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
 253                                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n",
 254                                             sp->sender_all_done,
 255                                             sp->length,
 256                                             sp->msg_is_complete,
 257                                             sp->put_last_out);
 258                                 }
 259                                 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1);
 260                                 TAILQ_REMOVE(&stcb->asoc.strmout[i].outqueue, sp, next);
 261                                 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, &asoc->strmout[i], sp, 1);
 262                                 if (sp->net) {
 263                                         sctp_free_remote_addr(sp->net);
 264                                         sp->net = NULL;
 265                                 }
 266                                 if (sp->data) {
 267                                         sctp_m_freem(sp->data);
 268                                         sp->data = NULL;
 269                                 }
 270                                 sctp_free_a_strmoq(stcb, sp, so_locked);
 271                                 if (!TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
 272                                         unsent_data++;
 273                                 }
 274                         } else {
 275                                 unsent_data++;
 276                         }
 277                         if (unsent_data > 0) {
 278                                 break;
 279                         }
 280                 }
 281         }
 282         SCTP_TCB_SEND_UNLOCK(stcb);
 283         return (unsent_data);
 284 }
 285
 286 static int
 287 sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb)
 288 {
 289         struct sctp_init *init;
 290         struct sctp_association *asoc;
 291         struct sctp_nets *lnet;
 292         unsigned int i;
 293
 294         init = &cp->init;
 295         asoc = &stcb->asoc;
 296         /* save off parameters */
 297         asoc->peer_vtag = ntohl(init->initiate_tag);
 298         asoc->peers_rwnd = ntohl(init->a_rwnd);
 299         /* init tsn's */
 300         asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1;
 301
 302         if (!TAILQ_EMPTY(&asoc->nets)) {
 303                 /* update any ssthresh's that may have a default */
 304                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
 305                         lnet->ssthresh = asoc->peers_rwnd;
 306                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) {
 307                                 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION);
 308                         }
 309                 }
 310         }
 311         SCTP_TCB_SEND_LOCK(stcb);
 312         if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) {
 313                 unsigned int newcnt;
 314                 struct sctp_stream_out *outs;
 315                 struct sctp_stream_queue_pending *sp, *nsp;
 316                 struct sctp_tmit_chunk *chk, *nchk;
 317
 318                 /* abandon the upper streams */
 319                 newcnt = ntohs(init->num_inbound_streams);
 320                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
 321                         if (chk->rec.data.sid >= newcnt) {
 322                                 TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next);
 323                                 asoc->send_queue_cnt--;
 324                                 if (asoc->strmout[chk->rec.data.sid].chunks_on_queues > 0) {
 325                                         asoc->strmout[chk->rec.data.sid].chunks_on_queues--;
 326 #ifdef INVARIANTS
 327                                 } else {
 328                                         panic("No chunks on the queues for sid %u.", chk->rec.data.sid);
 329 #endif
 330                                 }
 331                                 if (chk->data != NULL) {
 332                                         sctp_free_bufspace(stcb, asoc, chk, 1);
 333                                         sctp_ulp_notify(SCTP_NOTIFY_UNSENT_DG_FAIL, stcb,
 334                                             0, chk, SCTP_SO_NOT_LOCKED);
 335                                         if (chk->data) {
 336                                                 sctp_m_freem(chk->data);
 337                                                 chk->data = NULL;
 338                                         }
 339                                 }
 340                                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
 341                                 /* sa_ignore FREED_MEMORY */
 342                         }
 343                 }
 344                 if (asoc->strmout) {
 345                         for (i = newcnt; i < asoc->pre_open_streams; i++) {
 346                                 outs = &asoc->strmout[i];
 347                                 TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) {
 348                                         atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1);
 349                                         TAILQ_REMOVE(&outs->outqueue, sp, next);
 350                                         stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, outs, sp, 1);
 351                                         sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL,
 352                                             stcb, 0, sp, SCTP_SO_NOT_LOCKED);
 353                                         if (sp->data) {
 354                                                 sctp_m_freem(sp->data);
 355                                                 sp->data = NULL;
 356                                         }
 357                                         if (sp->net) {
 358                                                 sctp_free_remote_addr(sp->net);
 359                                                 sp->net = NULL;
 360                                         }
 361                                         /* Free the chunk */
 362                                         sctp_free_a_strmoq(stcb, sp, SCTP_SO_NOT_LOCKED);
 363                                         /* sa_ignore FREED_MEMORY */
 364                                 }
 365                                 outs->state = SCTP_STREAM_CLOSED;
 366                         }
 367                 }
 368                 /* cut back the count */
 369                 asoc->pre_open_streams = newcnt;
 370         }
 371         SCTP_TCB_SEND_UNLOCK(stcb);
 372         asoc->streamoutcnt = asoc->pre_open_streams;
 373         if (asoc->strmout) {
 374                 for (i = 0; i < asoc->streamoutcnt; i++) {
 375                         asoc->strmout[i].state = SCTP_STREAM_OPEN;
 376                 }
 377         }
 378         /* EY - nr_sack: initialize highest tsn in nr_mapping_array */
 379         asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
 380         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
 381                 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
 382         }
 383         /* This is the next one we expect */
 384         asoc->str_reset_seq_in = asoc->asconf_seq_in + 1;
 385
 386         asoc->mapping_array_base_tsn = ntohl(init->initial_tsn);
 387         asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in;
 388
 389         asoc->advanced_peer_ack_point = asoc->last_acked_seq;
 390         /* open the requested streams */
 391
 392         if (asoc->strmin != NULL) {
 393                 /* Free the old ones */
 394                 for (i = 0; i < asoc->streamincnt; i++) {
 395                         sctp_clean_up_stream(stcb, &asoc->strmin[i].inqueue);
 396                         sctp_clean_up_stream(stcb, &asoc->strmin[i].uno_inqueue);
 397                 }
 398                 SCTP_FREE(asoc->strmin, SCTP_M_STRMI);
 399         }
 400         if (asoc->max_inbound_streams > ntohs(init->num_outbound_streams)) {
 401                 asoc->streamincnt = ntohs(init->num_outbound_streams);
 402         } else {
 403                 asoc->streamincnt = asoc->max_inbound_streams;
 404         }
 405         SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt *
 406             sizeof(struct sctp_stream_in), SCTP_M_STRMI);
 407         if (asoc->strmin == NULL) {
 408                 /* we didn't get memory for the streams! */
 409                 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n");
 410                 return (-1);
 411         }
 412         for (i = 0; i < asoc->streamincnt; i++) {
 413                 asoc->strmin[i].sid = i;
 414                 asoc->strmin[i].last_mid_delivered = 0xffffffff;
 415                 TAILQ_INIT(&asoc->strmin[i].inqueue);
 416                 TAILQ_INIT(&asoc->strmin[i].uno_inqueue);
 417                 asoc->strmin[i].pd_api_started = 0;
 418                 asoc->strmin[i].delivery_started = 0;
 419         }
 420         /*
 421          * load_address_from_init will put the addresses into the
 422          * association when the COOKIE is processed or the INIT-ACK is
 423          * processed. Both types of COOKIE's existing and new call this
 424          * routine. It will remove addresses that are no longer in the
 425          * association (for the restarting case where addresses are
 426          * removed). Up front when the INIT arrives we will discard it if it
 427          * is a restart and new addresses have been added.
 428          */
 429         /* sa_ignore MEMLEAK */
 430         return (0);
 431 }
 432
 433 /*
 434  * INIT-ACK message processing/consumption returns value < 0 on error
 435  */
 436 static int
 437 sctp_process_init_ack(struct mbuf *m, int iphlen, int offset,
 438     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
 439     struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
 440     struct sctp_nets *net, int *abort_no_unlock,
 441     uint8_t mflowtype, uint32_t mflowid,
 442     uint32_t vrf_id)
 443 {
 444         struct sctp_association *asoc;
 445         struct mbuf *op_err;
 446         int retval, abort_flag;
 447         uint32_t initack_limit;
 448         int nat_friendly = 0;
 449
 450         /* First verify that we have no illegal param's */
 451         abort_flag = 0;
 452
 453         op_err = sctp_arethere_unrecognized_parameters(m,
 454             (offset + sizeof(struct sctp_init_chunk)),
 455             &abort_flag, (struct sctp_chunkhdr *)cp, &nat_friendly);
 456         if (abort_flag) {
 457                 /* Send an abort and notify peer */
 458                 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
 459                 *abort_no_unlock = 1;
 460                 return (-1);
 461         }
 462         asoc = &stcb->asoc;
 463         asoc->peer_supports_nat = (uint8_t)nat_friendly;
 464         /* process the peer's parameters in the INIT-ACK */
 465         retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb);
 466         if (retval < 0) {
 467                 return (retval);
 468         }
 469         initack_limit = offset + ntohs(cp->ch.chunk_length);
 470         /* load all addresses */
 471         if ((retval = sctp_load_addresses_from_init(stcb, m,
 472             (offset + sizeof(struct sctp_init_chunk)), initack_limit,
 473             src, dst, NULL, stcb->asoc.port))) {
 474                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 475                     "Problem with address parameters");
 476                 SCTPDBG(SCTP_DEBUG_INPUT1,
 477                     "Load addresses from INIT causes an abort %d\n",
 478                     retval);
 479                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
 480                     src, dst, sh, op_err,
 481                     mflowtype, mflowid,
 482                     vrf_id, net->port);
 483                 *abort_no_unlock = 1;
 484                 return (-1);
 485         }
 486         /* if the peer doesn't support asconf, flush the asconf queue */
 487         if (asoc->asconf_supported == 0) {
 488                 struct sctp_asconf_addr *param, *nparam;
 489
 490                 TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) {
 491                         TAILQ_REMOVE(&asoc->asconf_queue, param, next);
 492                         SCTP_FREE(param, SCTP_M_ASC_ADDR);
 493                 }
 494         }
 495         stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs,
 496             stcb->asoc.local_hmacs);
 497         if (op_err) {
 498                 sctp_queue_op_err(stcb, op_err);
 499                 /* queuing will steal away the mbuf chain to the out queue */
 500                 op_err = NULL;
 501         }
 502         /* extract the cookie and queue it to "echo" it back... */
 503         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 504                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
 505                     stcb->asoc.overall_error_count,
 506                     0,
 507                     SCTP_FROM_SCTP_INPUT,
 508                     __LINE__);
 509         }
 510         stcb->asoc.overall_error_count = 0;
 511         net->error_count = 0;
 512
 513         /*
 514          * Cancel the INIT timer, We do this first before queueing the
 515          * cookie. We always cancel at the primary to assue that we are
 516          * canceling the timer started by the INIT which always goes to the
 517          * primary.
 518          */
 519         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb,
 520             asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3);
 521
 522         /* calculate the RTO */
 523         net->RTO = sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, sctp_align_safe_nocopy,
 524             SCTP_RTT_FROM_NON_DATA);
 525         retval = sctp_send_cookie_echo(m, offset, stcb, net);
 526         if (retval < 0) {
 527                 /*
 528                  * No cookie, we probably should send a op error. But in any
 529                  * case if there is no cookie in the INIT-ACK, we can
 530                  * abandon the peer, its broke.
 531                  */
 532                 if (retval == -3) {
 533                         uint16_t len;
 534
 535                         len = (uint16_t)(sizeof(struct sctp_error_missing_param) + sizeof(uint16_t));
 536                         /* We abort with an error of missing mandatory param */
 537                         op_err = sctp_get_mbuf_for_msg(len, 0, M_NOWAIT, 1, MT_DATA);
 538                         if (op_err != NULL) {
 539                                 struct sctp_error_missing_param *cause;
 540
 541                                 SCTP_BUF_LEN(op_err) = len;
 542                                 cause = mtod(op_err, struct sctp_error_missing_param *);
 543                                 /* Subtract the reserved param */
 544                                 cause->cause.code = htons(SCTP_CAUSE_MISSING_PARAM);
 545                                 cause->cause.length = htons(len);
 546                                 cause->num_missing_params = htonl(1);
 547                                 cause->type[0] = htons(SCTP_STATE_COOKIE);
 548                         }
 549                         sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
 550                             src, dst, sh, op_err,
 551                             mflowtype, 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         union sctp_sockstore 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         if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) {
 571                 /* Invalid length */
 572                 return;
 573         }
 574         memset(&store, 0, sizeof(store));
 575         switch (cp->heartbeat.hb_info.addr_family) {
 576 #ifdef INET
 577         case AF_INET:
 578                 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) {
 579                         store.sin.sin_family = cp->heartbeat.hb_info.addr_family;
 580                         store.sin.sin_len = cp->heartbeat.hb_info.addr_len;
 581                         store.sin.sin_port = stcb->rport;
 582                         memcpy(&store.sin.sin_addr, cp->heartbeat.hb_info.address,
 583                             sizeof(store.sin.sin_addr));
 584                 } else {
 585                         return;
 586                 }
 587                 break;
 588 #endif
 589 #ifdef INET6
 590         case AF_INET6:
 591                 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) {
 592                         store.sin6.sin6_family = cp->heartbeat.hb_info.addr_family;
 593                         store.sin6.sin6_len = cp->heartbeat.hb_info.addr_len;
 594                         store.sin6.sin6_port = stcb->rport;
 595                         memcpy(&store.sin6.sin6_addr, cp->heartbeat.hb_info.address, sizeof(struct in6_addr));
 596                 } else {
 597                         return;
 598                 }
 599                 break;
 600 #endif
 601         default:
 602                 return;
 603         }
 604         r_net = sctp_findnet(stcb, &store.sa);
 605         if (r_net == NULL) {
 606                 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n");
 607                 return;
 608         }
 609         if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) &&
 610             (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) &&
 611             (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) {
 612                 /*
 613                  * If the its a HB and it's random value is correct when can
 614                  * confirm the destination.
 615                  */
 616                 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
 617                 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) {
 618                         stcb->asoc.primary_destination = r_net;
 619                         r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY;
 620                         f_net = TAILQ_FIRST(&stcb->asoc.nets);
 621                         if (f_net != r_net) {
 622                                 /*
 623                                  * first one on the list is NOT the primary
 624                                  * sctp_cmpaddr() is much more efficient if
 625                                  * the primary is the first on the list,
 626                                  * make it so.
 627                                  */
 628                                 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next);
 629                                 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next);
 630                         }
 631                         req_prim = 1;
 632                 }
 633                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
 634                     stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED);
 635                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb,
 636                     r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4);
 637                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
 638         }
 639         old_error_counter = r_net->error_count;
 640         r_net->error_count = 0;
 641         r_net->hb_responded = 1;
 642         tv.tv_sec = cp->heartbeat.hb_info.time_value_1;
 643         tv.tv_usec = cp->heartbeat.hb_info.time_value_2;
 644         /* Now lets do a RTO with this */
 645         r_net->RTO = sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, sctp_align_safe_nocopy,
 646             SCTP_RTT_FROM_NON_DATA);
 647         if (!(r_net->dest_state & SCTP_ADDR_REACHABLE)) {
 648                 r_net->dest_state |= SCTP_ADDR_REACHABLE;
 649                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb,
 650                     0, (void *)r_net, SCTP_SO_NOT_LOCKED);
 651         }
 652         if (r_net->dest_state & SCTP_ADDR_PF) {
 653                 r_net->dest_state &= ~SCTP_ADDR_PF;
 654                 stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net);
 655         }
 656         if (old_error_counter > 0) {
 657                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
 658                     stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_5);
 659                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
 660         }
 661         if (r_net == stcb->asoc.primary_destination) {
 662                 if (stcb->asoc.alternate) {
 663                         /* release the alternate, primary is good */
 664                         sctp_free_remote_addr(stcb->asoc.alternate);
 665                         stcb->asoc.alternate = NULL;
 666                 }
 667         }
 668         /* Mobility adaptation */
 669         if (req_prim) {
 670                 if ((sctp_is_mobility_feature_on(stcb->sctp_ep,
 671                     SCTP_MOBILITY_BASE) ||
 672                     sctp_is_mobility_feature_on(stcb->sctp_ep,
 673                     SCTP_MOBILITY_FASTHANDOFF)) &&
 674                     sctp_is_mobility_feature_on(stcb->sctp_ep,
 675                     SCTP_MOBILITY_PRIM_DELETED)) {
 676
 677                         sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED,
 678                             stcb->sctp_ep, stcb, NULL,
 679                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_6);
 680                         if (sctp_is_mobility_feature_on(stcb->sctp_ep,
 681                             SCTP_MOBILITY_FASTHANDOFF)) {
 682                                 sctp_assoc_immediate_retrans(stcb,
 683                                     stcb->asoc.primary_destination);
 684                         }
 685                         if (sctp_is_mobility_feature_on(stcb->sctp_ep,
 686                             SCTP_MOBILITY_BASE)) {
 687                                 sctp_move_chunks_from_net(stcb,
 688                                     stcb->asoc.deleted_primary);
 689                         }
 690                         sctp_delete_prim_timer(stcb->sctp_ep, stcb,
 691                             stcb->asoc.deleted_primary);
 692                 }
 693         }
 694 }
 695
 696 static int
 697 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb)
 698 {
 699         /*
 700          * return 0 means we want you to proceed with the abort non-zero
 701          * means no abort processing
 702          */
 703         struct sctpasochead *head;
 704
 705         if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_WAIT) {
 706                 /* generate a new vtag and send init */
 707                 LIST_REMOVE(stcb, sctp_asocs);
 708                 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1);
 709                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
 710                 /*
 711                  * put it in the bucket in the vtag hash of assoc's for the
 712                  * system
 713                  */
 714                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
 715                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
 716                 return (1);
 717         }
 718         if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) {
 719                 /*
 720                  * treat like a case where the cookie expired i.e.: - dump
 721                  * current cookie. - generate a new vtag. - resend init.
 722                  */
 723                 /* generate a new vtag and send init */
 724                 LIST_REMOVE(stcb, sctp_asocs);
 725                 stcb->asoc.state &= ~SCTP_STATE_COOKIE_ECHOED;
 726                 stcb->asoc.state |= SCTP_STATE_COOKIE_WAIT;
 727                 sctp_stop_all_cookie_timers(stcb);
 728                 sctp_toss_old_cookies(stcb, &stcb->asoc);
 729                 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1);
 730                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
 731                 /*
 732                  * put it in the bucket in the vtag hash of assoc's for the
 733                  * system
 734                  */
 735                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
 736                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
 737                 return (1);
 738         }
 739         return (0);
 740 }
 741
 742 static int
 743 sctp_handle_nat_missing_state(struct sctp_tcb *stcb,
 744     struct sctp_nets *net)
 745 {
 746         /*
 747          * return 0 means we want you to proceed with the abort non-zero
 748          * means no abort processing
 749          */
 750         if (stcb->asoc.auth_supported == 0) {
 751                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n");
 752                 return (0);
 753         }
 754         sctp_asconf_send_nat_state_update(stcb, net);
 755         return (1);
 756 }
 757
 758
 759 static void
 760 sctp_handle_abort(struct sctp_abort_chunk *abort,
 761     struct sctp_tcb *stcb, struct sctp_nets *net)
 762 {
 763 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 764         struct socket *so;
 765 #endif
 766         uint16_t len;
 767         uint16_t error;
 768
 769         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n");
 770         if (stcb == NULL)
 771                 return;
 772
 773         len = ntohs(abort->ch.chunk_length);
 774         if (len > sizeof(struct sctp_chunkhdr)) {
 775                 /*
 776                  * Need to check the cause codes for our two magic nat
 777                  * aborts which don't kill the assoc necessarily.
 778                  */
 779                 struct sctp_gen_error_cause *cause;
 780
 781                 cause = (struct sctp_gen_error_cause *)(abort + 1);
 782                 error = ntohs(cause->code);
 783                 if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) {
 784                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n",
 785                             abort->ch.chunk_flags);
 786                         if (sctp_handle_nat_colliding_state(stcb)) {
 787                                 return;
 788                         }
 789                 } else if (error == SCTP_CAUSE_NAT_MISSING_STATE) {
 790                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n",
 791                             abort->ch.chunk_flags);
 792                         if (sctp_handle_nat_missing_state(stcb, net)) {
 793                                 return;
 794                         }
 795                 }
 796         } else {
 797                 error = 0;
 798         }
 799         /* stop any receive timers */
 800         sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net,
 801             SCTP_FROM_SCTP_INPUT + SCTP_LOC_7);
 802         /* notify user of the abort and clean up... */
 803         sctp_abort_notification(stcb, 1, error, abort, SCTP_SO_NOT_LOCKED);
 804         /* free the tcb */
 805         SCTP_STAT_INCR_COUNTER32(sctps_aborted);
 806         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) ||
 807             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
 808                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 809         }
 810 #ifdef SCTP_ASOCLOG_OF_TSNS
 811         sctp_print_out_track_log(stcb);
 812 #endif
 813 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 814         so = SCTP_INP_SO(stcb->sctp_ep);
 815         atomic_add_int(&stcb->asoc.refcnt, 1);
 816         SCTP_TCB_UNLOCK(stcb);
 817         SCTP_SOCKET_LOCK(so, 1);
 818         SCTP_TCB_LOCK(stcb);
 819         atomic_subtract_int(&stcb->asoc.refcnt, 1);
 820 #endif
 821         stcb->asoc.state |= SCTP_STATE_WAS_ABORTED;
 822         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
 823             SCTP_FROM_SCTP_INPUT + SCTP_LOC_8);
 824 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 825         SCTP_SOCKET_UNLOCK(so, 1);
 826 #endif
 827         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n");
 828 }
 829
 830 static void
 831 sctp_start_net_timers(struct sctp_tcb *stcb)
 832 {
 833         uint32_t cnt_hb_sent;
 834         struct sctp_nets *net;
 835
 836         cnt_hb_sent = 0;
 837         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
 838                 /*
 839                  * For each network start: 1) A pmtu timer. 2) A HB timer 3)
 840                  * If the dest in unconfirmed send a hb as well if under
 841                  * max_hb_burst have been sent.
 842                  */
 843                 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net);
 844                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net);
 845                 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) &&
 846                     (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) {
 847                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
 848                         cnt_hb_sent++;
 849                 }
 850         }
 851         if (cnt_hb_sent) {
 852                 sctp_chunk_output(stcb->sctp_ep, stcb,
 853                     SCTP_OUTPUT_FROM_COOKIE_ACK,
 854                     SCTP_SO_NOT_LOCKED);
 855         }
 856 }
 857
 858
 859 static void
 860 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp,
 861     struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag)
 862 {
 863         struct sctp_association *asoc;
 864         int some_on_streamwheel;
 865         int old_state;
 866 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 867         struct socket *so;
 868 #endif
 869
 870         SCTPDBG(SCTP_DEBUG_INPUT2,
 871             "sctp_handle_shutdown: handling SHUTDOWN\n");
 872         if (stcb == NULL)
 873                 return;
 874         asoc = &stcb->asoc;
 875         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
 876             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
 877                 return;
 878         }
 879         if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) {
 880                 /* Shutdown NOT the expected size */
 881                 return;
 882         }
 883         old_state = SCTP_GET_STATE(asoc);
 884         sctp_update_acked(stcb, cp, abort_flag);
 885         if (*abort_flag) {
 886                 return;
 887         }
 888         if (asoc->control_pdapi) {
 889                 /*
 890                  * With a normal shutdown we assume the end of last record.
 891                  */
 892                 SCTP_INP_READ_LOCK(stcb->sctp_ep);
 893                 if (asoc->control_pdapi->on_strm_q) {
 894                         struct sctp_stream_in *strm;
 895
 896                         strm = &asoc->strmin[asoc->control_pdapi->sinfo_stream];
 897                         if (asoc->control_pdapi->on_strm_q == SCTP_ON_UNORDERED) {
 898                                 /* Unordered */
 899                                 TAILQ_REMOVE(&strm->uno_inqueue, asoc->control_pdapi, next_instrm);
 900                                 asoc->control_pdapi->on_strm_q = 0;
 901                         } else if (asoc->control_pdapi->on_strm_q == SCTP_ON_ORDERED) {
 902                                 /* Ordered */
 903                                 TAILQ_REMOVE(&strm->inqueue, asoc->control_pdapi, next_instrm);
 904                                 asoc->control_pdapi->on_strm_q = 0;
 905 #ifdef INVARIANTS
 906                         } else {
 907                                 panic("Unknown state on ctrl:%p on_strm_q:%d",
 908                                     asoc->control_pdapi,
 909                                     asoc->control_pdapi->on_strm_q);
 910 #endif
 911                         }
 912                 }
 913                 asoc->control_pdapi->end_added = 1;
 914                 asoc->control_pdapi->pdapi_aborted = 1;
 915                 asoc->control_pdapi = NULL;
 916                 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
 917 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 918                 so = SCTP_INP_SO(stcb->sctp_ep);
 919                 atomic_add_int(&stcb->asoc.refcnt, 1);
 920                 SCTP_TCB_UNLOCK(stcb);
 921                 SCTP_SOCKET_LOCK(so, 1);
 922                 SCTP_TCB_LOCK(stcb);
 923                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 924                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
 925                         /* assoc was freed while we were unlocked */
 926                         SCTP_SOCKET_UNLOCK(so, 1);
 927                         return;
 928                 }
 929 #endif
 930                 if (stcb->sctp_socket) {
 931                         sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
 932                 }
 933 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 934                 SCTP_SOCKET_UNLOCK(so, 1);
 935 #endif
 936         }
 937         /* goto SHUTDOWN_RECEIVED state to block new requests */
 938         if (stcb->sctp_socket) {
 939                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
 940                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) &&
 941                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) {
 942                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_RECEIVED);
 943                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
 944                         /*
 945                          * notify upper layer that peer has initiated a
 946                          * shutdown
 947                          */
 948                         sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
 949
 950                         /* reset time */
 951                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
 952                 }
 953         }
 954         if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) {
 955                 /*
 956                  * stop the shutdown timer, since we WILL move to
 957                  * SHUTDOWN-ACK-SENT.
 958                  */
 959                 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
 960                     net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9);
 961         }
 962         /* Now is there unsent data on a stream somewhere? */
 963         some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED);
 964
 965         if (!TAILQ_EMPTY(&asoc->send_queue) ||
 966             !TAILQ_EMPTY(&asoc->sent_queue) ||
 967             some_on_streamwheel) {
 968                 /* By returning we will push more data out */
 969                 return;
 970         } else {
 971                 /* no outstanding data to send, so move on... */
 972                 /* send SHUTDOWN-ACK */
 973                 /* move to SHUTDOWN-ACK-SENT state */
 974                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
 975                     (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
 976                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 977                 }
 978                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
 979                 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
 980                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT);
 981                         sctp_stop_timers_for_shutdown(stcb);
 982                         sctp_send_shutdown_ack(stcb, net);
 983                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK,
 984                             stcb->sctp_ep, stcb, net);
 985                 } else if (old_state == SCTP_STATE_SHUTDOWN_ACK_SENT) {
 986                         sctp_send_shutdown_ack(stcb, net);
 987                 }
 988         }
 989 }
 990
 991 static void
 992 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED,
 993     struct sctp_tcb *stcb,
 994     struct sctp_nets *net)
 995 {
 996         struct sctp_association *asoc;
 997 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 998         struct socket *so;
 999
1000         so = SCTP_INP_SO(stcb->sctp_ep);
1001 #endif
1002         SCTPDBG(SCTP_DEBUG_INPUT2,
1003             "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n");
1004         if (stcb == NULL)
1005                 return;
1006
1007         asoc = &stcb->asoc;
1008         /* process according to association state */
1009         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
1010             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
1011                 /* unexpected SHUTDOWN-ACK... do OOTB handling... */
1012                 sctp_send_shutdown_complete(stcb, net, 1);
1013                 SCTP_TCB_UNLOCK(stcb);
1014                 return;
1015         }
1016         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
1017             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
1018                 /* unexpected SHUTDOWN-ACK... so ignore... */
1019                 SCTP_TCB_UNLOCK(stcb);
1020                 return;
1021         }
1022         if (asoc->control_pdapi) {
1023                 /*
1024                  * With a normal shutdown we assume the end of last record.
1025                  */
1026                 SCTP_INP_READ_LOCK(stcb->sctp_ep);
1027                 asoc->control_pdapi->end_added = 1;
1028                 asoc->control_pdapi->pdapi_aborted = 1;
1029                 asoc->control_pdapi = NULL;
1030                 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
1031 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1032                 atomic_add_int(&stcb->asoc.refcnt, 1);
1033                 SCTP_TCB_UNLOCK(stcb);
1034                 SCTP_SOCKET_LOCK(so, 1);
1035                 SCTP_TCB_LOCK(stcb);
1036                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
1037                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1038                         /* assoc was freed while we were unlocked */
1039                         SCTP_SOCKET_UNLOCK(so, 1);
1040                         return;
1041                 }
1042 #endif
1043                 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
1044 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1045                 SCTP_SOCKET_UNLOCK(so, 1);
1046 #endif
1047         }
1048 #ifdef INVARIANTS
1049         if (!TAILQ_EMPTY(&asoc->send_queue) ||
1050             !TAILQ_EMPTY(&asoc->sent_queue) ||
1051             sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) {
1052                 panic("Queues are not empty when handling SHUTDOWN-ACK");
1053         }
1054 #endif
1055         /* stop the timer */
1056         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net,
1057             SCTP_FROM_SCTP_INPUT + SCTP_LOC_10);
1058         /* send SHUTDOWN-COMPLETE */
1059         sctp_send_shutdown_complete(stcb, net, 0);
1060         /* notify upper layer protocol */
1061         if (stcb->sctp_socket) {
1062                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1063                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
1064                         stcb->sctp_socket->so_snd.sb_cc = 0;
1065                 }
1066                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
1067         }
1068         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
1069         /* free the TCB but first save off the ep */
1070 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1071         atomic_add_int(&stcb->asoc.refcnt, 1);
1072         SCTP_TCB_UNLOCK(stcb);
1073         SCTP_SOCKET_LOCK(so, 1);
1074         SCTP_TCB_LOCK(stcb);
1075         atomic_subtract_int(&stcb->asoc.refcnt, 1);
1076 #endif
1077         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1078             SCTP_FROM_SCTP_INPUT + SCTP_LOC_11);
1079 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1080         SCTP_SOCKET_UNLOCK(so, 1);
1081 #endif
1082 }
1083
1084 /*
1085  * Skip past the param header and then we will find the chunk that caused the
1086  * problem. There are two possibilities ASCONF or FWD-TSN other than that and
1087  * our peer must be broken.
1088  */
1089 static void
1090 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr,
1091     struct sctp_nets *net)
1092 {
1093         struct sctp_chunkhdr *chk;
1094
1095         chk = (struct sctp_chunkhdr *)((caddr_t)phdr + sizeof(*phdr));
1096         switch (chk->chunk_type) {
1097         case SCTP_ASCONF_ACK:
1098         case SCTP_ASCONF:
1099                 sctp_asconf_cleanup(stcb, net);
1100                 break;
1101         case SCTP_IFORWARD_CUM_TSN:
1102         case SCTP_FORWARD_CUM_TSN:
1103                 stcb->asoc.prsctp_supported = 0;
1104                 break;
1105         default:
1106                 SCTPDBG(SCTP_DEBUG_INPUT2,
1107                     "Peer does not support chunk type %d(%x)??\n",
1108                     chk->chunk_type, (uint32_t)chk->chunk_type);
1109                 break;
1110         }
1111 }
1112
1113 /*
1114  * Skip past the param header and then we will find the param that caused the
1115  * problem.  There are a number of param's in a ASCONF OR the prsctp param
1116  * these will turn of specific features.
1117  * XXX: Is this the right thing to do?
1118  */
1119 static void
1120 sctp_process_unrecog_param(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr)
1121 {
1122         struct sctp_paramhdr *pbad;
1123
1124         pbad = phdr + 1;
1125         switch (ntohs(pbad->param_type)) {
1126                 /* pr-sctp draft */
1127         case SCTP_PRSCTP_SUPPORTED:
1128                 stcb->asoc.prsctp_supported = 0;
1129                 break;
1130         case SCTP_SUPPORTED_CHUNK_EXT:
1131                 break;
1132                 /* draft-ietf-tsvwg-addip-sctp */
1133         case SCTP_HAS_NAT_SUPPORT:
1134                 stcb->asoc.peer_supports_nat = 0;
1135                 break;
1136         case SCTP_ADD_IP_ADDRESS:
1137         case SCTP_DEL_IP_ADDRESS:
1138         case SCTP_SET_PRIM_ADDR:
1139                 stcb->asoc.asconf_supported = 0;
1140                 break;
1141         case SCTP_SUCCESS_REPORT:
1142         case SCTP_ERROR_CAUSE_IND:
1143                 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n");
1144                 SCTPDBG(SCTP_DEBUG_INPUT2,
1145                     "Turning off ASCONF to this strange peer\n");
1146                 stcb->asoc.asconf_supported = 0;
1147                 break;
1148         default:
1149                 SCTPDBG(SCTP_DEBUG_INPUT2,
1150                     "Peer does not support param type %d(%x)??\n",
1151                     pbad->param_type, (uint32_t)pbad->param_type);
1152                 break;
1153         }
1154 }
1155
1156 static int
1157 sctp_handle_error(struct sctp_chunkhdr *ch,
1158     struct sctp_tcb *stcb, struct sctp_nets *net)
1159 {
1160         int chklen;
1161         struct sctp_paramhdr *phdr;
1162         uint16_t error, error_type;
1163         uint16_t error_len;
1164         struct sctp_association *asoc;
1165         int adjust;
1166 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1167         struct socket *so;
1168 #endif
1169
1170         /* parse through all of the errors and process */
1171         asoc = &stcb->asoc;
1172         phdr = (struct sctp_paramhdr *)((caddr_t)ch +
1173             sizeof(struct sctp_chunkhdr));
1174         chklen = ntohs(ch->chunk_length) - sizeof(struct sctp_chunkhdr);
1175         error = 0;
1176         while ((size_t)chklen >= sizeof(struct sctp_paramhdr)) {
1177                 /* Process an Error Cause */
1178                 error_type = ntohs(phdr->param_type);
1179                 error_len = ntohs(phdr->param_length);
1180                 if ((error_len > chklen) || (error_len == 0)) {
1181                         /* invalid param length for this param */
1182                         SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in error param- chunk left:%d errorlen:%d\n",
1183                             chklen, error_len);
1184                         return (0);
1185                 }
1186                 if (error == 0) {
1187                         /* report the first error cause */
1188                         error = error_type;
1189                 }
1190                 switch (error_type) {
1191                 case SCTP_CAUSE_INVALID_STREAM:
1192                 case SCTP_CAUSE_MISSING_PARAM:
1193                 case SCTP_CAUSE_INVALID_PARAM:
1194                 case SCTP_CAUSE_NO_USER_DATA:
1195                         SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %d back? We have a bug :/ (or do they?)\n",
1196                             error_type);
1197                         break;
1198                 case SCTP_CAUSE_NAT_COLLIDING_STATE:
1199                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n",
1200                             ch->chunk_flags);
1201                         if (sctp_handle_nat_colliding_state(stcb)) {
1202                                 return (0);
1203                         }
1204                         break;
1205                 case SCTP_CAUSE_NAT_MISSING_STATE:
1206                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n",
1207                             ch->chunk_flags);
1208                         if (sctp_handle_nat_missing_state(stcb, net)) {
1209                                 return (0);
1210                         }
1211                         break;
1212                 case SCTP_CAUSE_STALE_COOKIE:
1213                         /*
1214                          * We only act if we have echoed a cookie and are
1215                          * waiting.
1216                          */
1217                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) {
1218                                 int *p;
1219
1220                                 p = (int *)((caddr_t)phdr + sizeof(*phdr));
1221                                 /* Save the time doubled */
1222                                 asoc->cookie_preserve_req = ntohl(*p) << 1;
1223                                 asoc->stale_cookie_count++;
1224                                 if (asoc->stale_cookie_count >
1225                                     asoc->max_init_times) {
1226                                         sctp_abort_notification(stcb, 0, 0, NULL, SCTP_SO_NOT_LOCKED);
1227                                         /* now free the asoc */
1228 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1229                                         so = SCTP_INP_SO(stcb->sctp_ep);
1230                                         atomic_add_int(&stcb->asoc.refcnt, 1);
1231                                         SCTP_TCB_UNLOCK(stcb);
1232                                         SCTP_SOCKET_LOCK(so, 1);
1233                                         SCTP_TCB_LOCK(stcb);
1234                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
1235 #endif
1236                                         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1237                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_12);
1238 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1239                                         SCTP_SOCKET_UNLOCK(so, 1);
1240 #endif
1241                                         return (-1);
1242                                 }
1243                                 /* blast back to INIT state */
1244                                 sctp_toss_old_cookies(stcb, &stcb->asoc);
1245                                 asoc->state &= ~SCTP_STATE_COOKIE_ECHOED;
1246                                 asoc->state |= SCTP_STATE_COOKIE_WAIT;
1247                                 sctp_stop_all_cookie_timers(stcb);
1248                                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
1249                         }
1250                         break;
1251                 case SCTP_CAUSE_UNRESOLVABLE_ADDR:
1252                         /*
1253                          * Nothing we can do here, we don't do hostname
1254                          * addresses so if the peer does not like my IPv6
1255                          * (or IPv4 for that matter) it does not matter. If
1256                          * they don't support that type of address, they can
1257                          * NOT possibly get that packet type... i.e. with no
1258                          * IPv6 you can't receive a IPv6 packet. so we can
1259                          * safely ignore this one. If we ever added support
1260                          * for HOSTNAME Addresses, then we would need to do
1261                          * something here.
1262                          */
1263                         break;
1264                 case SCTP_CAUSE_UNRECOG_CHUNK:
1265                         sctp_process_unrecog_chunk(stcb, phdr, net);
1266                         break;
1267                 case SCTP_CAUSE_UNRECOG_PARAM:
1268                         sctp_process_unrecog_param(stcb, phdr);
1269                         break;
1270                 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN:
1271                         /*
1272                          * We ignore this since the timer will drive out a
1273                          * new cookie anyway and there timer will drive us
1274                          * to send a SHUTDOWN_COMPLETE. We can't send one
1275                          * here since we don't have their tag.
1276                          */
1277                         break;
1278                 case SCTP_CAUSE_DELETING_LAST_ADDR:
1279                 case SCTP_CAUSE_RESOURCE_SHORTAGE:
1280                 case SCTP_CAUSE_DELETING_SRC_ADDR:
1281                         /*
1282                          * We should NOT get these here, but in a
1283                          * ASCONF-ACK.
1284                          */
1285                         SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a Operational Error?<%d>?\n",
1286                             error_type);
1287                         break;
1288                 case SCTP_CAUSE_OUT_OF_RESC:
1289                         /*
1290                          * And what, pray tell do we do with the fact that
1291                          * the peer is out of resources? Not really sure we
1292                          * could do anything but abort. I suspect this
1293                          * should have came WITH an abort instead of in a
1294                          * OP-ERROR.
1295                          */
1296                         break;
1297                 default:
1298                         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown error type = 0x%xh\n",
1299                             error_type);
1300                         break;
1301                 }
1302                 adjust = SCTP_SIZE32(error_len);
1303                 chklen -= adjust;
1304                 phdr = (struct sctp_paramhdr *)((caddr_t)phdr + adjust);
1305         }
1306         sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, error, ch, SCTP_SO_NOT_LOCKED);
1307         return (0);
1308 }
1309
1310 static int
1311 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset,
1312     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
1313     struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
1314     struct sctp_nets *net, int *abort_no_unlock,
1315     uint8_t mflowtype, uint32_t mflowid,
1316     uint32_t vrf_id)
1317 {
1318         struct sctp_init_ack *init_ack;
1319         struct mbuf *op_err;
1320
1321         SCTPDBG(SCTP_DEBUG_INPUT2,
1322             "sctp_handle_init_ack: handling INIT-ACK\n");
1323
1324         if (stcb == NULL) {
1325                 SCTPDBG(SCTP_DEBUG_INPUT2,
1326                     "sctp_handle_init_ack: TCB is null\n");
1327                 return (-1);
1328         }
1329         if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) {
1330                 /* Invalid length */
1331                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1332                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1333                     src, dst, sh, op_err,
1334                     mflowtype, mflowid,
1335                     vrf_id, net->port);
1336                 *abort_no_unlock = 1;
1337                 return (-1);
1338         }
1339         init_ack = &cp->init;
1340         /* validate parameters */
1341         if (init_ack->initiate_tag == 0) {
1342                 /* protocol error... send an abort */
1343                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1344                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1345                     src, dst, sh, op_err,
1346                     mflowtype, mflowid,
1347                     vrf_id, net->port);
1348                 *abort_no_unlock = 1;
1349                 return (-1);
1350         }
1351         if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) {
1352                 /* protocol error... send an abort */
1353                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1354                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1355                     src, dst, sh, op_err,
1356                     mflowtype, mflowid,
1357                     vrf_id, net->port);
1358                 *abort_no_unlock = 1;
1359                 return (-1);
1360         }
1361         if (init_ack->num_inbound_streams == 0) {
1362                 /* protocol error... send an abort */
1363                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1364                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1365                     src, dst, sh, op_err,
1366                     mflowtype, mflowid,
1367                     vrf_id, net->port);
1368                 *abort_no_unlock = 1;
1369                 return (-1);
1370         }
1371         if (init_ack->num_outbound_streams == 0) {
1372                 /* protocol error... send an abort */
1373                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1374                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1375                     src, dst, sh, op_err,
1376                     mflowtype, mflowid,
1377                     vrf_id, net->port);
1378                 *abort_no_unlock = 1;
1379                 return (-1);
1380         }
1381         /* process according to association state... */
1382         switch (stcb->asoc.state & SCTP_STATE_MASK) {
1383         case SCTP_STATE_COOKIE_WAIT:
1384                 /* this is the expected state for this chunk */
1385                 /* process the INIT-ACK parameters */
1386                 if (stcb->asoc.primary_destination->dest_state &
1387                     SCTP_ADDR_UNCONFIRMED) {
1388                         /*
1389                          * The primary is where we sent the INIT, we can
1390                          * always consider it confirmed when the INIT-ACK is
1391                          * returned. Do this before we load addresses
1392                          * though.
1393                          */
1394                         stcb->asoc.primary_destination->dest_state &=
1395                             ~SCTP_ADDR_UNCONFIRMED;
1396                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
1397                             stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED);
1398                 }
1399                 if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb,
1400                     net, abort_no_unlock,
1401                     mflowtype, mflowid,
1402                     vrf_id) < 0) {
1403                         /* error in parsing parameters */
1404                         return (-1);
1405                 }
1406                 /* update our state */
1407                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n");
1408                 SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_ECHOED);
1409
1410                 /* reset the RTO calc */
1411                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
1412                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
1413                             stcb->asoc.overall_error_count,
1414                             0,
1415                             SCTP_FROM_SCTP_INPUT,
1416                             __LINE__);
1417                 }
1418                 stcb->asoc.overall_error_count = 0;
1419                 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
1420                 /*
1421                  * collapse the init timer back in case of a exponential
1422                  * backoff
1423                  */
1424                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep,
1425                     stcb, net);
1426                 /*
1427                  * the send at the end of the inbound data processing will
1428                  * cause the cookie to be sent
1429                  */
1430                 break;
1431         case SCTP_STATE_SHUTDOWN_SENT:
1432                 /* incorrect state... discard */
1433                 break;
1434         case SCTP_STATE_COOKIE_ECHOED:
1435                 /* incorrect state... discard */
1436                 break;
1437         case SCTP_STATE_OPEN:
1438                 /* incorrect state... discard */
1439                 break;
1440         case SCTP_STATE_EMPTY:
1441         case SCTP_STATE_INUSE:
1442         default:
1443                 /* incorrect state... discard */
1444                 return (-1);
1445                 break;
1446         }
1447         SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n");
1448         return (0);
1449 }
1450
1451 static struct sctp_tcb *
1452 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
1453     struct sockaddr *src, struct sockaddr *dst,
1454     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1455     struct sctp_inpcb *inp, struct sctp_nets **netp,
1456     struct sockaddr *init_src, int *notification,
1457     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1458     uint8_t mflowtype, uint32_t mflowid,
1459     uint32_t vrf_id, uint16_t port);
1460
1461
1462 /*
1463  * handle a state cookie for an existing association m: input packet mbuf
1464  * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a
1465  * "split" mbuf and the cookie signature does not exist offset: offset into
1466  * mbuf to the cookie-echo chunk
1467  */
1468 static struct sctp_tcb *
1469 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset,
1470     struct sockaddr *src, struct sockaddr *dst,
1471     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1472     struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp,
1473     struct sockaddr *init_src, int *notification,
1474     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1475     uint8_t mflowtype, uint32_t mflowid,
1476     uint32_t vrf_id, uint16_t port)
1477 {
1478         struct sctp_association *asoc;
1479         struct sctp_init_chunk *init_cp, init_buf;
1480         struct sctp_init_ack_chunk *initack_cp, initack_buf;
1481         struct sctp_nets *net;
1482         struct mbuf *op_err;
1483         int init_offset, initack_offset, i;
1484         int retval;
1485         int spec_flag = 0;
1486         uint32_t how_indx;
1487 #if defined(SCTP_DETAILED_STR_STATS)
1488         int j;
1489 #endif
1490
1491         net = *netp;
1492         /* I know that the TCB is non-NULL from the caller */
1493         asoc = &stcb->asoc;
1494         for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) {
1495                 if (asoc->cookie_how[how_indx] == 0)
1496                         break;
1497         }
1498         if (how_indx < sizeof(asoc->cookie_how)) {
1499                 asoc->cookie_how[how_indx] = 1;
1500         }
1501         if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
1502                 /* SHUTDOWN came in after sending INIT-ACK */
1503                 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination);
1504                 op_err = sctp_generate_cause(SCTP_CAUSE_COOKIE_IN_SHUTDOWN, "");
1505                 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
1506                     mflowtype, mflowid, inp->fibnum,
1507                     vrf_id, net->port);
1508                 if (how_indx < sizeof(asoc->cookie_how))
1509                         asoc->cookie_how[how_indx] = 2;
1510                 return (NULL);
1511         }
1512         /*
1513          * find and validate the INIT chunk in the cookie (peer's info) the
1514          * INIT should start after the cookie-echo header struct (chunk
1515          * header, state cookie header struct)
1516          */
1517         init_offset = offset += sizeof(struct sctp_cookie_echo_chunk);
1518
1519         init_cp = (struct sctp_init_chunk *)
1520             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
1521             (uint8_t *)&init_buf);
1522         if (init_cp == NULL) {
1523                 /* could not pull a INIT chunk in cookie */
1524                 return (NULL);
1525         }
1526         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
1527                 return (NULL);
1528         }
1529         /*
1530          * find and validate the INIT-ACK chunk in the cookie (my info) the
1531          * INIT-ACK follows the INIT chunk
1532          */
1533         initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
1534         initack_cp = (struct sctp_init_ack_chunk *)
1535             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
1536             (uint8_t *)&initack_buf);
1537         if (initack_cp == NULL) {
1538                 /* could not pull INIT-ACK chunk in cookie */
1539                 return (NULL);
1540         }
1541         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
1542                 return (NULL);
1543         }
1544         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1545             (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) {
1546                 /*
1547                  * case D in Section 5.2.4 Table 2: MMAA process accordingly
1548                  * to get into the OPEN state
1549                  */
1550                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1551                         /*-
1552                          * Opps, this means that we somehow generated two vtag's
1553                          * the same. I.e. we did:
1554                          *  Us               Peer
1555                          *   <---INIT(tag=a)------
1556                          *   ----INIT-ACK(tag=t)-->
1557                          *   ----INIT(tag=t)------> *1
1558                          *   <---INIT-ACK(tag=a)---
1559                          *   <----CE(tag=t)------------- *2
1560                          *
1561                          * At point *1 we should be generating a different
1562                          * tag t'. Which means we would throw away the CE and send
1563                          * ours instead. Basically this is case C (throw away side).
1564                          */
1565                         if (how_indx < sizeof(asoc->cookie_how))
1566                                 asoc->cookie_how[how_indx] = 17;
1567                         return (NULL);
1568
1569                 }
1570                 switch (SCTP_GET_STATE(asoc)) {
1571                 case SCTP_STATE_COOKIE_WAIT:
1572                 case SCTP_STATE_COOKIE_ECHOED:
1573                         /*
1574                          * INIT was sent but got a COOKIE_ECHO with the
1575                          * correct tags... just accept it...but we must
1576                          * process the init so that we can make sure we have
1577                          * the right seq no's.
1578                          */
1579                         /* First we must process the INIT !! */
1580                         retval = sctp_process_init(init_cp, stcb);
1581                         if (retval < 0) {
1582                                 if (how_indx < sizeof(asoc->cookie_how))
1583                                         asoc->cookie_how[how_indx] = 3;
1584                                 return (NULL);
1585                         }
1586                         /* we have already processed the INIT so no problem */
1587                         sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp,
1588                             stcb, net,
1589                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_13);
1590                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp,
1591                             stcb, net,
1592                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_14);
1593                         /* update current state */
1594                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)
1595                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1596                         else
1597                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1598
1599                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1600                         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1601                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1602                                     stcb->sctp_ep, stcb, asoc->primary_destination);
1603                         }
1604                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1605                         sctp_stop_all_cookie_timers(stcb);
1606                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1607                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1608                             (inp->sctp_socket->so_qlimit == 0)
1609                             ) {
1610 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1611                                 struct socket *so;
1612 #endif
1613                                 /*
1614                                  * Here is where collision would go if we
1615                                  * did a connect() and instead got a
1616                                  * init/init-ack/cookie done before the
1617                                  * init-ack came back..
1618                                  */
1619                                 stcb->sctp_ep->sctp_flags |=
1620                                     SCTP_PCB_FLAGS_CONNECTED;
1621 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1622                                 so = SCTP_INP_SO(stcb->sctp_ep);
1623                                 atomic_add_int(&stcb->asoc.refcnt, 1);
1624                                 SCTP_TCB_UNLOCK(stcb);
1625                                 SCTP_SOCKET_LOCK(so, 1);
1626                                 SCTP_TCB_LOCK(stcb);
1627                                 atomic_add_int(&stcb->asoc.refcnt, -1);
1628                                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1629                                         SCTP_SOCKET_UNLOCK(so, 1);
1630                                         return (NULL);
1631                                 }
1632 #endif
1633                                 soisconnected(stcb->sctp_socket);
1634 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1635                                 SCTP_SOCKET_UNLOCK(so, 1);
1636 #endif
1637                         }
1638                         /* notify upper layer */
1639                         *notification = SCTP_NOTIFY_ASSOC_UP;
1640                         /*
1641                          * since we did not send a HB make sure we don't
1642                          * double things
1643                          */
1644                         net->hb_responded = 1;
1645                         net->RTO = sctp_calculate_rto(stcb, asoc, net,
1646                             &cookie->time_entered,
1647                             sctp_align_unsafe_makecopy,
1648                             SCTP_RTT_FROM_NON_DATA);
1649
1650                         if (stcb->asoc.sctp_autoclose_ticks &&
1651                             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) {
1652                                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
1653                                     inp, stcb, NULL);
1654                         }
1655                         break;
1656                 default:
1657                         /*
1658                          * we're in the OPEN state (or beyond), so peer must
1659                          * have simply lost the COOKIE-ACK
1660                          */
1661                         break;
1662                 }               /* end switch */
1663                 sctp_stop_all_cookie_timers(stcb);
1664                 /*
1665                  * We ignore the return code here.. not sure if we should
1666                  * somehow abort.. but we do have an existing asoc. This
1667                  * really should not fail.
1668                  */
1669                 if (sctp_load_addresses_from_init(stcb, m,
1670                     init_offset + sizeof(struct sctp_init_chunk),
1671                     initack_offset, src, dst, init_src, stcb->asoc.port)) {
1672                         if (how_indx < sizeof(asoc->cookie_how))
1673                                 asoc->cookie_how[how_indx] = 4;
1674                         return (NULL);
1675                 }
1676                 /* respond with a COOKIE-ACK */
1677                 sctp_toss_old_cookies(stcb, asoc);
1678                 sctp_send_cookie_ack(stcb);
1679                 if (how_indx < sizeof(asoc->cookie_how))
1680                         asoc->cookie_how[how_indx] = 5;
1681                 return (stcb);
1682         }
1683         if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1684             ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag &&
1685             cookie->tie_tag_my_vtag == 0 &&
1686             cookie->tie_tag_peer_vtag == 0) {
1687                 /*
1688                  * case C in Section 5.2.4 Table 2: XMOO silently discard
1689                  */
1690                 if (how_indx < sizeof(asoc->cookie_how))
1691                         asoc->cookie_how[how_indx] = 6;
1692                 return (NULL);
1693         }
1694         /*
1695          * If nat support, and the below and stcb is established, send back
1696          * a ABORT(colliding state) if we are established.
1697          */
1698         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) &&
1699             (asoc->peer_supports_nat) &&
1700             ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1701             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1702             (asoc->peer_vtag == 0)))) {
1703                 /*
1704                  * Special case - Peer's support nat. We may have two init's
1705                  * that we gave out the same tag on since one was not
1706                  * established.. i.e. we get INIT from host-1 behind the nat
1707                  * and we respond tag-a, we get a INIT from host-2 behind
1708                  * the nat and we get tag-a again. Then we bring up host-1
1709                  * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1).
1710                  * Now we have colliding state. We must send an abort here
1711                  * with colliding state indication.
1712                  */
1713                 op_err = sctp_generate_cause(SCTP_CAUSE_NAT_COLLIDING_STATE, "");
1714                 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err,
1715                     mflowtype, mflowid, inp->fibnum,
1716                     vrf_id, port);
1717                 return (NULL);
1718         }
1719         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1720             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1721             (asoc->peer_vtag == 0))) {
1722                 /*
1723                  * case B in Section 5.2.4 Table 2: MXAA or MOAA my info
1724                  * should be ok, re-accept peer info
1725                  */
1726                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1727                         /*
1728                          * Extension of case C. If we hit this, then the
1729                          * random number generator returned the same vtag
1730                          * when we first sent our INIT-ACK and when we later
1731                          * sent our INIT. The side with the seq numbers that
1732                          * are different will be the one that normnally
1733                          * would have hit case C. This in effect "extends"
1734                          * our vtags in this collision case to be 64 bits.
1735                          * The same collision could occur aka you get both
1736                          * vtag and seq number the same twice in a row.. but
1737                          * is much less likely. If it did happen then we
1738                          * would proceed through and bring up the assoc.. we
1739                          * may end up with the wrong stream setup however..
1740                          * which would be bad.. but there is no way to
1741                          * tell.. until we send on a stream that does not
1742                          * exist :-)
1743                          */
1744                         if (how_indx < sizeof(asoc->cookie_how))
1745                                 asoc->cookie_how[how_indx] = 7;
1746
1747                         return (NULL);
1748                 }
1749                 if (how_indx < sizeof(asoc->cookie_how))
1750                         asoc->cookie_how[how_indx] = 8;
1751                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net,
1752                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_15);
1753                 sctp_stop_all_cookie_timers(stcb);
1754                 /*
1755                  * since we did not send a HB make sure we don't double
1756                  * things
1757                  */
1758                 net->hb_responded = 1;
1759                 if (stcb->asoc.sctp_autoclose_ticks &&
1760                     sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
1761                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb,
1762                             NULL);
1763                 }
1764                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1765                 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
1766
1767                 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) {
1768                         /*
1769                          * Ok the peer probably discarded our data (if we
1770                          * echoed a cookie+data). So anything on the
1771                          * sent_queue should be marked for retransmit, we
1772                          * may not get something to kick us so it COULD
1773                          * still take a timeout to move these.. but it can't
1774                          * hurt to mark them.
1775                          */
1776                         struct sctp_tmit_chunk *chk;
1777
1778                         TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
1779                                 if (chk->sent < SCTP_DATAGRAM_RESEND) {
1780                                         chk->sent = SCTP_DATAGRAM_RESEND;
1781                                         sctp_flight_size_decrease(chk);
1782                                         sctp_total_flight_decrease(stcb, chk);
1783                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1784                                         spec_flag++;
1785                                 }
1786                         }
1787
1788                 }
1789                 /* process the INIT info (peer's info) */
1790                 retval = sctp_process_init(init_cp, stcb);
1791                 if (retval < 0) {
1792                         if (how_indx < sizeof(asoc->cookie_how))
1793                                 asoc->cookie_how[how_indx] = 9;
1794                         return (NULL);
1795                 }
1796                 if (sctp_load_addresses_from_init(stcb, m,
1797                     init_offset + sizeof(struct sctp_init_chunk),
1798                     initack_offset, src, dst, init_src, stcb->asoc.port)) {
1799                         if (how_indx < sizeof(asoc->cookie_how))
1800                                 asoc->cookie_how[how_indx] = 10;
1801                         return (NULL);
1802                 }
1803                 if ((asoc->state & SCTP_STATE_COOKIE_WAIT) ||
1804                     (asoc->state & SCTP_STATE_COOKIE_ECHOED)) {
1805                         *notification = SCTP_NOTIFY_ASSOC_UP;
1806
1807                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1808                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1809                             (inp->sctp_socket->so_qlimit == 0)) {
1810 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1811                                 struct socket *so;
1812 #endif
1813                                 stcb->sctp_ep->sctp_flags |=
1814                                     SCTP_PCB_FLAGS_CONNECTED;
1815 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1816                                 so = SCTP_INP_SO(stcb->sctp_ep);
1817                                 atomic_add_int(&stcb->asoc.refcnt, 1);
1818                                 SCTP_TCB_UNLOCK(stcb);
1819                                 SCTP_SOCKET_LOCK(so, 1);
1820                                 SCTP_TCB_LOCK(stcb);
1821                                 atomic_add_int(&stcb->asoc.refcnt, -1);
1822                                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1823                                         SCTP_SOCKET_UNLOCK(so, 1);
1824                                         return (NULL);
1825                                 }
1826 #endif
1827                                 soisconnected(stcb->sctp_socket);
1828 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1829                                 SCTP_SOCKET_UNLOCK(so, 1);
1830 #endif
1831                         }
1832                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)
1833                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1834                         else
1835                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1836                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1837                 } else if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
1838                         SCTP_STAT_INCR_COUNTER32(sctps_restartestab);
1839                 } else {
1840                         SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1841                 }
1842                 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1843                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1844                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1845                             stcb->sctp_ep, stcb, asoc->primary_destination);
1846                 }
1847                 sctp_stop_all_cookie_timers(stcb);
1848                 sctp_toss_old_cookies(stcb, asoc);
1849                 sctp_send_cookie_ack(stcb);
1850                 if (spec_flag) {
1851                         /*
1852                          * only if we have retrans set do we do this. What
1853                          * this call does is get only the COOKIE-ACK out and
1854                          * then when we return the normal call to
1855                          * sctp_chunk_output will get the retrans out behind
1856                          * this.
1857                          */
1858                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED);
1859                 }
1860                 if (how_indx < sizeof(asoc->cookie_how))
1861                         asoc->cookie_how[how_indx] = 11;
1862
1863                 return (stcb);
1864         }
1865         if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1866             ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) &&
1867             cookie->tie_tag_my_vtag == asoc->my_vtag_nonce &&
1868             cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce &&
1869             cookie->tie_tag_peer_vtag != 0) {
1870                 struct sctpasochead *head;
1871 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1872                 struct socket *so;
1873 #endif
1874
1875                 if (asoc->peer_supports_nat) {
1876                         /*
1877                          * This is a gross gross hack. Just call the
1878                          * cookie_new code since we are allowing a duplicate
1879                          * association. I hope this works...
1880                          */
1881                         return (sctp_process_cookie_new(m, iphlen, offset, src, dst,
1882                             sh, cookie, cookie_len,
1883                             inp, netp, init_src, notification,
1884                             auth_skipped, auth_offset, auth_len,
1885                             mflowtype, mflowid,
1886                             vrf_id, port));
1887                 }
1888                 /*
1889                  * case A in Section 5.2.4 Table 2: XXMM (peer restarted)
1890                  */
1891                 /* temp code */
1892                 if (how_indx < sizeof(asoc->cookie_how))
1893                         asoc->cookie_how[how_indx] = 12;
1894                 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net,
1895                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
1896                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net,
1897                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_17);
1898
1899                 /* notify upper layer */
1900                 *notification = SCTP_NOTIFY_ASSOC_RESTART;
1901                 atomic_add_int(&stcb->asoc.refcnt, 1);
1902                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_OPEN) &&
1903                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
1904                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) {
1905                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1906                 }
1907                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
1908                         SCTP_STAT_INCR_GAUGE32(sctps_restartestab);
1909                 } else if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) {
1910                         SCTP_STAT_INCR_GAUGE32(sctps_collisionestab);
1911                 }
1912                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1913                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1914                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1915                             stcb->sctp_ep, stcb, asoc->primary_destination);
1916
1917                 } else if (!(asoc->state & SCTP_STATE_SHUTDOWN_SENT)) {
1918                         /* move to OPEN state, if not in SHUTDOWN_SENT */
1919                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1920                 }
1921                 asoc->pre_open_streams =
1922                     ntohs(initack_cp->init.num_outbound_streams);
1923                 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
1924                 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
1925                 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
1926
1927                 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
1928
1929                 asoc->str_reset_seq_in = asoc->init_seq_number;
1930
1931                 asoc->advanced_peer_ack_point = asoc->last_acked_seq;
1932                 if (asoc->mapping_array) {
1933                         memset(asoc->mapping_array, 0,
1934                             asoc->mapping_array_size);
1935                 }
1936                 if (asoc->nr_mapping_array) {
1937                         memset(asoc->nr_mapping_array, 0,
1938                             asoc->mapping_array_size);
1939                 }
1940                 SCTP_TCB_UNLOCK(stcb);
1941 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1942                 so = SCTP_INP_SO(stcb->sctp_ep);
1943                 SCTP_SOCKET_LOCK(so, 1);
1944 #endif
1945                 SCTP_INP_INFO_WLOCK();
1946                 SCTP_INP_WLOCK(stcb->sctp_ep);
1947                 SCTP_TCB_LOCK(stcb);
1948                 atomic_add_int(&stcb->asoc.refcnt, -1);
1949                 /* send up all the data */
1950                 SCTP_TCB_SEND_LOCK(stcb);
1951
1952                 sctp_report_all_outbound(stcb, 0, 1, SCTP_SO_LOCKED);
1953                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
1954                         stcb->asoc.strmout[i].chunks_on_queues = 0;
1955 #if defined(SCTP_DETAILED_STR_STATS)
1956                         for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
1957                                 asoc->strmout[i].abandoned_sent[j] = 0;
1958                                 asoc->strmout[i].abandoned_unsent[j] = 0;
1959                         }
1960 #else
1961                         asoc->strmout[i].abandoned_sent[0] = 0;
1962                         asoc->strmout[i].abandoned_unsent[0] = 0;
1963 #endif
1964                         stcb->asoc.strmout[i].sid = i;
1965                         stcb->asoc.strmout[i].next_mid_ordered = 0;
1966                         stcb->asoc.strmout[i].next_mid_unordered = 0;
1967                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
1968                 }
1969                 /* process the INIT-ACK info (my info) */
1970                 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
1971                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1972
1973                 /* pull from vtag hash */
1974                 LIST_REMOVE(stcb, sctp_asocs);
1975                 /* re-insert to new vtag position */
1976                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag,
1977                     SCTP_BASE_INFO(hashasocmark))];
1978                 /*
1979                  * put it in the bucket in the vtag hash of assoc's for the
1980                  * system
1981                  */
1982                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
1983
1984                 SCTP_TCB_SEND_UNLOCK(stcb);
1985                 SCTP_INP_WUNLOCK(stcb->sctp_ep);
1986                 SCTP_INP_INFO_WUNLOCK();
1987 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1988                 SCTP_SOCKET_UNLOCK(so, 1);
1989 #endif
1990                 asoc->total_flight = 0;
1991                 asoc->total_flight_count = 0;
1992                 /* process the INIT info (peer's info) */
1993                 retval = sctp_process_init(init_cp, stcb);
1994                 if (retval < 0) {
1995                         if (how_indx < sizeof(asoc->cookie_how))
1996                                 asoc->cookie_how[how_indx] = 13;
1997
1998                         return (NULL);
1999                 }
2000                 /*
2001                  * since we did not send a HB make sure we don't double
2002                  * things
2003                  */
2004                 net->hb_responded = 1;
2005
2006                 if (sctp_load_addresses_from_init(stcb, m,
2007                     init_offset + sizeof(struct sctp_init_chunk),
2008                     initack_offset, src, dst, init_src, stcb->asoc.port)) {
2009                         if (how_indx < sizeof(asoc->cookie_how))
2010                                 asoc->cookie_how[how_indx] = 14;
2011
2012                         return (NULL);
2013                 }
2014                 /* respond with a COOKIE-ACK */
2015                 sctp_stop_all_cookie_timers(stcb);
2016                 sctp_toss_old_cookies(stcb, asoc);
2017                 sctp_send_cookie_ack(stcb);
2018                 if (how_indx < sizeof(asoc->cookie_how))
2019                         asoc->cookie_how[how_indx] = 15;
2020
2021                 return (stcb);
2022         }
2023         if (how_indx < sizeof(asoc->cookie_how))
2024                 asoc->cookie_how[how_indx] = 16;
2025         /* all other cases... */
2026         return (NULL);
2027 }
2028
2029
2030 /*
2031  * handle a state cookie for a new association m: input packet mbuf chain--
2032  * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf
2033  * and the cookie signature does not exist offset: offset into mbuf to the
2034  * cookie-echo chunk length: length of the cookie chunk to: where the init
2035  * was from returns a new TCB
2036  */
2037 static struct sctp_tcb *
2038 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
2039     struct sockaddr *src, struct sockaddr *dst,
2040     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
2041     struct sctp_inpcb *inp, struct sctp_nets **netp,
2042     struct sockaddr *init_src, int *notification,
2043     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
2044     uint8_t mflowtype, uint32_t mflowid,
2045     uint32_t vrf_id, uint16_t port)
2046 {
2047         struct sctp_tcb *stcb;
2048         struct sctp_init_chunk *init_cp, init_buf;
2049         struct sctp_init_ack_chunk *initack_cp, initack_buf;
2050         union sctp_sockstore store;
2051         struct sctp_association *asoc;
2052         int init_offset, initack_offset, initack_limit;
2053         int retval;
2054         int error = 0;
2055         uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE];
2056 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2057         struct socket *so;
2058
2059         so = SCTP_INP_SO(inp);
2060 #endif
2061
2062         /*
2063          * find and validate the INIT chunk in the cookie (peer's info) the
2064          * INIT should start after the cookie-echo header struct (chunk
2065          * header, state cookie header struct)
2066          */
2067         init_offset = offset + sizeof(struct sctp_cookie_echo_chunk);
2068         init_cp = (struct sctp_init_chunk *)
2069             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
2070             (uint8_t *)&init_buf);
2071         if (init_cp == NULL) {
2072                 /* could not pull a INIT chunk in cookie */
2073                 SCTPDBG(SCTP_DEBUG_INPUT1,
2074                     "process_cookie_new: could not pull INIT chunk hdr\n");
2075                 return (NULL);
2076         }
2077         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
2078                 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n");
2079                 return (NULL);
2080         }
2081         initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
2082         /*
2083          * find and validate the INIT-ACK chunk in the cookie (my info) the
2084          * INIT-ACK follows the INIT chunk
2085          */
2086         initack_cp = (struct sctp_init_ack_chunk *)
2087             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
2088             (uint8_t *)&initack_buf);
2089         if (initack_cp == NULL) {
2090                 /* could not pull INIT-ACK chunk in cookie */
2091                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n");
2092                 return (NULL);
2093         }
2094         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
2095                 return (NULL);
2096         }
2097         /*
2098          * NOTE: We can't use the INIT_ACK's chk_length to determine the
2099          * "initack_limit" value.  This is because the chk_length field
2100          * includes the length of the cookie, but the cookie is omitted when
2101          * the INIT and INIT_ACK are tacked onto the cookie...
2102          */
2103         initack_limit = offset + cookie_len;
2104
2105         /*
2106          * now that we know the INIT/INIT-ACK are in place, create a new TCB
2107          * and popluate
2108          */
2109
2110         /*
2111          * Here we do a trick, we set in NULL for the proc/thread argument.
2112          * We do this since in effect we only use the p argument when the
2113          * socket is unbound and we must do an implicit bind. Since we are
2114          * getting a cookie, we cannot be unbound.
2115          */
2116         stcb = sctp_aloc_assoc(inp, init_src, &error,
2117             ntohl(initack_cp->init.initiate_tag), vrf_id,
2118             ntohs(initack_cp->init.num_outbound_streams),
2119             port,
2120             (struct thread *)NULL
2121             );
2122         if (stcb == NULL) {
2123                 struct mbuf *op_err;
2124
2125                 /* memory problem? */
2126                 SCTPDBG(SCTP_DEBUG_INPUT1,
2127                     "process_cookie_new: no room for another TCB!\n");
2128                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2129                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2130                     src, dst, sh, op_err,
2131                     mflowtype, mflowid,
2132                     vrf_id, port);
2133                 return (NULL);
2134         }
2135         /* get the correct sctp_nets */
2136         if (netp)
2137                 *netp = sctp_findnet(stcb, init_src);
2138
2139         asoc = &stcb->asoc;
2140         /* get scope variables out of cookie */
2141         asoc->scope.ipv4_local_scope = cookie->ipv4_scope;
2142         asoc->scope.site_scope = cookie->site_scope;
2143         asoc->scope.local_scope = cookie->local_scope;
2144         asoc->scope.loopback_scope = cookie->loopback_scope;
2145
2146         if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) ||
2147             (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) {
2148                 struct mbuf *op_err;
2149
2150                 /*
2151                  * Houston we have a problem. The EP changed while the
2152                  * cookie was in flight. Only recourse is to abort the
2153                  * association.
2154                  */
2155                 atomic_add_int(&stcb->asoc.refcnt, 1);
2156                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2157                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2158                     src, dst, sh, op_err,
2159                     mflowtype, mflowid,
2160                     vrf_id, port);
2161 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2162                 SCTP_TCB_UNLOCK(stcb);
2163                 SCTP_SOCKET_LOCK(so, 1);
2164                 SCTP_TCB_LOCK(stcb);
2165 #endif
2166                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2167                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_18);
2168 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2169                 SCTP_SOCKET_UNLOCK(so, 1);
2170 #endif
2171                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2172                 return (NULL);
2173         }
2174         /* process the INIT-ACK info (my info) */
2175         asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
2176         asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
2177         asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
2178         asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
2179         asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
2180         asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
2181         asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
2182         asoc->str_reset_seq_in = asoc->init_seq_number;
2183
2184         asoc->advanced_peer_ack_point = asoc->last_acked_seq;
2185
2186         /* process the INIT info (peer's info) */
2187         if (netp)
2188                 retval = sctp_process_init(init_cp, stcb);
2189         else
2190                 retval = 0;
2191         if (retval < 0) {
2192                 atomic_add_int(&stcb->asoc.refcnt, 1);
2193 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2194                 SCTP_TCB_UNLOCK(stcb);
2195                 SCTP_SOCKET_LOCK(so, 1);
2196                 SCTP_TCB_LOCK(stcb);
2197 #endif
2198                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2199                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_19);
2200 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2201                 SCTP_SOCKET_UNLOCK(so, 1);
2202 #endif
2203                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2204                 return (NULL);
2205         }
2206         /* load all addresses */
2207         if (sctp_load_addresses_from_init(stcb, m,
2208             init_offset + sizeof(struct sctp_init_chunk), initack_offset,
2209             src, dst, init_src, port)) {
2210                 atomic_add_int(&stcb->asoc.refcnt, 1);
2211 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2212                 SCTP_TCB_UNLOCK(stcb);
2213                 SCTP_SOCKET_LOCK(so, 1);
2214                 SCTP_TCB_LOCK(stcb);
2215 #endif
2216                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2217                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_20);
2218 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2219                 SCTP_SOCKET_UNLOCK(so, 1);
2220 #endif
2221                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2222                 return (NULL);
2223         }
2224         /*
2225          * verify any preceding AUTH chunk that was skipped
2226          */
2227         /* pull the local authentication parameters from the cookie/init-ack */
2228         sctp_auth_get_cookie_params(stcb, m,
2229             initack_offset + sizeof(struct sctp_init_ack_chunk),
2230             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)));
2231         if (auth_skipped) {
2232                 struct sctp_auth_chunk *auth;
2233
2234                 auth = (struct sctp_auth_chunk *)
2235                     sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf);
2236                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) {
2237                         /* auth HMAC failed, dump the assoc and packet */
2238                         SCTPDBG(SCTP_DEBUG_AUTH1,
2239                             "COOKIE-ECHO: AUTH failed\n");
2240                         atomic_add_int(&stcb->asoc.refcnt, 1);
2241 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2242                         SCTP_TCB_UNLOCK(stcb);
2243                         SCTP_SOCKET_LOCK(so, 1);
2244                         SCTP_TCB_LOCK(stcb);
2245 #endif
2246                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2247                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_21);
2248 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2249                         SCTP_SOCKET_UNLOCK(so, 1);
2250 #endif
2251                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
2252                         return (NULL);
2253                 } else {
2254                         /* remaining chunks checked... good to go */
2255                         stcb->asoc.authenticated = 1;
2256                 }
2257         }
2258         /* update current state */
2259         SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2260         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
2261         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2262                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2263                     stcb->sctp_ep, stcb, asoc->primary_destination);
2264         }
2265         sctp_stop_all_cookie_timers(stcb);
2266         SCTP_STAT_INCR_COUNTER32(sctps_passiveestab);
2267         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2268
2269         /*
2270          * if we're doing ASCONFs, check to see if we have any new local
2271          * addresses that need to get added to the peer (eg. addresses
2272          * changed while cookie echo in flight).  This needs to be done
2273          * after we go to the OPEN state to do the correct asconf
2274          * processing. else, make sure we have the correct addresses in our
2275          * lists
2276          */
2277
2278         /* warning, we re-use sin, sin6, sa_store here! */
2279         /* pull in local_address (our "from" address) */
2280         switch (cookie->laddr_type) {
2281 #ifdef INET
2282         case SCTP_IPV4_ADDRESS:
2283                 /* source addr is IPv4 */
2284                 memset(&store.sin, 0, sizeof(struct sockaddr_in));
2285                 store.sin.sin_family = AF_INET;
2286                 store.sin.sin_len = sizeof(struct sockaddr_in);
2287                 store.sin.sin_addr.s_addr = cookie->laddress[0];
2288                 break;
2289 #endif
2290 #ifdef INET6
2291         case SCTP_IPV6_ADDRESS:
2292                 /* source addr is IPv6 */
2293                 memset(&store.sin6, 0, sizeof(struct sockaddr_in6));
2294                 store.sin6.sin6_family = AF_INET6;
2295                 store.sin6.sin6_len = sizeof(struct sockaddr_in6);
2296                 store.sin6.sin6_scope_id = cookie->scope_id;
2297                 memcpy(&store.sin6.sin6_addr, cookie->laddress, sizeof(struct in6_addr));
2298                 break;
2299 #endif
2300         default:
2301                 atomic_add_int(&stcb->asoc.refcnt, 1);
2302 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2303                 SCTP_TCB_UNLOCK(stcb);
2304                 SCTP_SOCKET_LOCK(so, 1);
2305                 SCTP_TCB_LOCK(stcb);
2306 #endif
2307                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2308                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_22);
2309 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2310                 SCTP_SOCKET_UNLOCK(so, 1);
2311 #endif
2312                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2313                 return (NULL);
2314         }
2315
2316         /* set up to notify upper layer */
2317         *notification = SCTP_NOTIFY_ASSOC_UP;
2318         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2319             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
2320             (inp->sctp_socket->so_qlimit == 0)) {
2321                 /*
2322                  * This is an endpoint that called connect() how it got a
2323                  * cookie that is NEW is a bit of a mystery. It must be that
2324                  * the INIT was sent, but before it got there.. a complete
2325                  * INIT/INIT-ACK/COOKIE arrived. But of course then it
2326                  * should have went to the other code.. not here.. oh well..
2327                  * a bit of protection is worth having..
2328                  */
2329                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2330 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2331                 atomic_add_int(&stcb->asoc.refcnt, 1);
2332                 SCTP_TCB_UNLOCK(stcb);
2333                 SCTP_SOCKET_LOCK(so, 1);
2334                 SCTP_TCB_LOCK(stcb);
2335                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2336                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
2337                         SCTP_SOCKET_UNLOCK(so, 1);
2338                         return (NULL);
2339                 }
2340 #endif
2341                 soisconnected(stcb->sctp_socket);
2342 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2343                 SCTP_SOCKET_UNLOCK(so, 1);
2344 #endif
2345         } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
2346             (inp->sctp_socket->so_qlimit)) {
2347                 /*
2348                  * We don't want to do anything with this one. Since it is
2349                  * the listening guy. The timer will get started for
2350                  * accepted connections in the caller.
2351                  */
2352                 ;
2353         }
2354         /* since we did not send a HB make sure we don't double things */
2355         if ((netp) && (*netp))
2356                 (*netp)->hb_responded = 1;
2357
2358         if (stcb->asoc.sctp_autoclose_ticks &&
2359             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2360                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL);
2361         }
2362         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
2363         if ((netp != NULL) && (*netp != NULL)) {
2364                 /* calculate the RTT and set the encaps port */
2365                 (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp,
2366                     &cookie->time_entered, sctp_align_unsafe_makecopy,
2367                     SCTP_RTT_FROM_NON_DATA);
2368         }
2369         /* respond with a COOKIE-ACK */
2370         sctp_send_cookie_ack(stcb);
2371
2372         /*
2373          * check the address lists for any ASCONFs that need to be sent
2374          * AFTER the cookie-ack is sent
2375          */
2376         sctp_check_address_list(stcb, m,
2377             initack_offset + sizeof(struct sctp_init_ack_chunk),
2378             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)),
2379             &store.sa, cookie->local_scope, cookie->site_scope,
2380             cookie->ipv4_scope, cookie->loopback_scope);
2381
2382
2383         return (stcb);
2384 }
2385
2386 /*
2387  * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e
2388  * we NEED to make sure we are not already using the vtag. If so we
2389  * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit!
2390         head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag,
2391                                                             SCTP_BASE_INFO(hashasocmark))];
2392         LIST_FOREACH(stcb, head, sctp_asocs) {
2393                 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep))  {
2394                        -- SEND ABORT - TRY AGAIN --
2395                 }
2396         }
2397 */
2398
2399 /*
2400  * handles a COOKIE-ECHO message stcb: modified to either a new or left as
2401  * existing (non-NULL) TCB
2402  */
2403 static struct mbuf *
2404 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset,
2405     struct sockaddr *src, struct sockaddr *dst,
2406     struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp,
2407     struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp,
2408     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
2409     struct sctp_tcb **locked_tcb,
2410     uint8_t mflowtype, uint32_t mflowid,
2411     uint32_t vrf_id, uint16_t port)
2412 {
2413         struct sctp_state_cookie *cookie;
2414         struct sctp_tcb *l_stcb = *stcb;
2415         struct sctp_inpcb *l_inp;
2416         struct sockaddr *to;
2417         struct sctp_pcb *ep;
2418         struct mbuf *m_sig;
2419         uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE];
2420         uint8_t *sig;
2421         uint8_t cookie_ok = 0;
2422         unsigned int sig_offset, cookie_offset;
2423         unsigned int cookie_len;
2424         struct timeval now;
2425         struct timeval time_expires;
2426         int notification = 0;
2427         struct sctp_nets *netl;
2428         int had_a_existing_tcb = 0;
2429         int send_int_conf = 0;
2430 #ifdef INET
2431         struct sockaddr_in sin;
2432 #endif
2433 #ifdef INET6
2434         struct sockaddr_in6 sin6;
2435 #endif
2436
2437         SCTPDBG(SCTP_DEBUG_INPUT2,
2438             "sctp_handle_cookie: handling COOKIE-ECHO\n");
2439
2440         if (inp_p == NULL) {
2441                 return (NULL);
2442         }
2443         cookie = &cp->cookie;
2444         cookie_offset = offset + sizeof(struct sctp_chunkhdr);
2445         cookie_len = ntohs(cp->ch.chunk_length);
2446
2447         if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) +
2448             sizeof(struct sctp_init_chunk) +
2449             sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) {
2450                 /* cookie too small */
2451                 return (NULL);
2452         }
2453         if ((cookie->peerport != sh->src_port) ||
2454             (cookie->myport != sh->dest_port) ||
2455             (cookie->my_vtag != sh->v_tag)) {
2456                 /*
2457                  * invalid ports or bad tag.  Note that we always leave the
2458                  * v_tag in the header in network order and when we stored
2459                  * it in the my_vtag slot we also left it in network order.
2460                  * This maintains the match even though it may be in the
2461                  * opposite byte order of the machine :->
2462                  */
2463                 return (NULL);
2464         }
2465         /*
2466          * split off the signature into its own mbuf (since it should not be
2467          * calculated in the sctp_hmac_m() call).
2468          */
2469         sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE;
2470         m_sig = m_split(m, sig_offset, M_NOWAIT);
2471         if (m_sig == NULL) {
2472                 /* out of memory or ?? */
2473                 return (NULL);
2474         }
2475 #ifdef SCTP_MBUF_LOGGING
2476         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
2477                 sctp_log_mbc(m_sig, SCTP_MBUF_SPLIT);
2478         }
2479 #endif
2480
2481         /*
2482          * compute the signature/digest for the cookie
2483          */
2484         ep = &(*inp_p)->sctp_ep;
2485         l_inp = *inp_p;
2486         if (l_stcb) {
2487                 SCTP_TCB_UNLOCK(l_stcb);
2488         }
2489         SCTP_INP_RLOCK(l_inp);
2490         if (l_stcb) {
2491                 SCTP_TCB_LOCK(l_stcb);
2492         }
2493         /* which cookie is it? */
2494         if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) &&
2495             (ep->current_secret_number != ep->last_secret_number)) {
2496                 /* it's the old cookie */
2497                 (void)sctp_hmac_m(SCTP_HMAC,
2498                     (uint8_t *)ep->secret_key[(int)ep->last_secret_number],
2499                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2500         } else {
2501                 /* it's the current cookie */
2502                 (void)sctp_hmac_m(SCTP_HMAC,
2503                     (uint8_t *)ep->secret_key[(int)ep->current_secret_number],
2504                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2505         }
2506         /* get the signature */
2507         SCTP_INP_RUNLOCK(l_inp);
2508         sig = (uint8_t *)sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *)&tmp_sig);
2509         if (sig == NULL) {
2510                 /* couldn't find signature */
2511                 sctp_m_freem(m_sig);
2512                 return (NULL);
2513         }
2514         /* compare the received digest with the computed digest */
2515         if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) {
2516                 /* try the old cookie? */
2517                 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) &&
2518                     (ep->current_secret_number != ep->last_secret_number)) {
2519                         /* compute digest with old */
2520                         (void)sctp_hmac_m(SCTP_HMAC,
2521                             (uint8_t *)ep->secret_key[(int)ep->last_secret_number],
2522                             SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2523                         /* compare */
2524                         if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0)
2525                                 cookie_ok = 1;
2526                 }
2527         } else {
2528                 cookie_ok = 1;
2529         }
2530
2531         /*
2532          * Now before we continue we must reconstruct our mbuf so that
2533          * normal processing of any other chunks will work.
2534          */
2535         {
2536                 struct mbuf *m_at;
2537
2538                 m_at = m;
2539                 while (SCTP_BUF_NEXT(m_at) != NULL) {
2540                         m_at = SCTP_BUF_NEXT(m_at);
2541                 }
2542                 SCTP_BUF_NEXT(m_at) = m_sig;
2543         }
2544
2545         if (cookie_ok == 0) {
2546                 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n");
2547                 SCTPDBG(SCTP_DEBUG_INPUT2,
2548                     "offset = %u, cookie_offset = %u, sig_offset = %u\n",
2549                     (uint32_t)offset, cookie_offset, sig_offset);
2550                 return (NULL);
2551         }
2552         /*
2553          * check the cookie timestamps to be sure it's not stale
2554          */
2555         (void)SCTP_GETTIME_TIMEVAL(&now);
2556         /* Expire time is in Ticks, so we convert to seconds */
2557         time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life);
2558         time_expires.tv_usec = cookie->time_entered.tv_usec;
2559         /*
2560          * TODO sctp_constants.h needs alternative time macros when _KERNEL
2561          * is undefined.
2562          */
2563         if (timevalcmp(&now, &time_expires, >)) {
2564                 /* cookie is stale! */
2565                 struct mbuf *op_err;
2566                 struct sctp_error_stale_cookie *cause;
2567                 uint32_t tim;
2568
2569                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_error_stale_cookie),
2570                     0, M_NOWAIT, 1, MT_DATA);
2571                 if (op_err == NULL) {
2572                         /* FOOBAR */
2573                         return (NULL);
2574                 }
2575                 /* Set the len */
2576                 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_error_stale_cookie);
2577                 cause = mtod(op_err, struct sctp_error_stale_cookie *);
2578                 cause->cause.code = htons(SCTP_CAUSE_STALE_COOKIE);
2579                 cause->cause.length = htons((sizeof(struct sctp_paramhdr) +
2580                     (sizeof(uint32_t))));
2581                 /* seconds to usec */
2582                 tim = (now.tv_sec - time_expires.tv_sec) * 1000000;
2583                 /* add in usec */
2584                 if (tim == 0)
2585                         tim = now.tv_usec - cookie->time_entered.tv_usec;
2586                 cause->stale_time = htonl(tim);
2587                 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
2588                     mflowtype, mflowid, l_inp->fibnum,
2589                     vrf_id, port);
2590                 return (NULL);
2591         }
2592         /*
2593          * Now we must see with the lookup address if we have an existing
2594          * asoc. This will only happen if we were in the COOKIE-WAIT state
2595          * and a INIT collided with us and somewhere the peer sent the
2596          * cookie on another address besides the single address our assoc
2597          * had for him. In this case we will have one of the tie-tags set at
2598          * least AND the address field in the cookie can be used to look it
2599          * up.
2600          */
2601         to = NULL;
2602         switch (cookie->addr_type) {
2603 #ifdef INET6
2604         case SCTP_IPV6_ADDRESS:
2605                 memset(&sin6, 0, sizeof(sin6));
2606                 sin6.sin6_family = AF_INET6;
2607                 sin6.sin6_len = sizeof(sin6);
2608                 sin6.sin6_port = sh->src_port;
2609                 sin6.sin6_scope_id = cookie->scope_id;
2610                 memcpy(&sin6.sin6_addr.s6_addr, cookie->address,
2611                     sizeof(sin6.sin6_addr.s6_addr));
2612                 to = (struct sockaddr *)&sin6;
2613                 break;
2614 #endif
2615 #ifdef INET
2616         case SCTP_IPV4_ADDRESS:
2617                 memset(&sin, 0, sizeof(sin));
2618                 sin.sin_family = AF_INET;
2619                 sin.sin_len = sizeof(sin);
2620                 sin.sin_port = sh->src_port;
2621                 sin.sin_addr.s_addr = cookie->address[0];
2622                 to = (struct sockaddr *)&sin;
2623                 break;
2624 #endif
2625         default:
2626                 /* This should not happen */
2627                 return (NULL);
2628         }
2629         if (*stcb == NULL) {
2630                 /* Yep, lets check */
2631                 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL);
2632                 if (*stcb == NULL) {
2633                         /*
2634                          * We should have only got back the same inp. If we
2635                          * got back a different ep we have a problem. The
2636                          * original findep got back l_inp and now
2637                          */
2638                         if (l_inp != *inp_p) {
2639                                 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n");
2640                         }
2641                 } else {
2642                         if (*locked_tcb == NULL) {
2643                                 /*
2644                                  * In this case we found the assoc only
2645                                  * after we locked the create lock. This
2646                                  * means we are in a colliding case and we
2647                                  * must make sure that we unlock the tcb if
2648                                  * its one of the cases where we throw away
2649                                  * the incoming packets.
2650                                  */
2651                                 *locked_tcb = *stcb;
2652
2653                                 /*
2654                                  * We must also increment the inp ref count
2655                                  * since the ref_count flags was set when we
2656                                  * did not find the TCB, now we found it
2657                                  * which reduces the refcount.. we must
2658                                  * raise it back out to balance it all :-)
2659                                  */
2660                                 SCTP_INP_INCR_REF((*stcb)->sctp_ep);
2661                                 if ((*stcb)->sctp_ep != l_inp) {
2662                                         SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n",
2663                                             (void *)(*stcb)->sctp_ep, (void *)l_inp);
2664                                 }
2665                         }
2666                 }
2667         }
2668         cookie_len -= SCTP_SIGNATURE_SIZE;
2669         if (*stcb == NULL) {
2670                 /* this is the "normal" case... get a new TCB */
2671                 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh,
2672                     cookie, cookie_len, *inp_p,
2673                     netp, to, &notification,
2674                     auth_skipped, auth_offset, auth_len,
2675                     mflowtype, mflowid,
2676                     vrf_id, port);
2677         } else {
2678                 /* this is abnormal... cookie-echo on existing TCB */
2679                 had_a_existing_tcb = 1;
2680                 *stcb = sctp_process_cookie_existing(m, iphlen, offset,
2681                     src, dst, sh,
2682                     cookie, cookie_len, *inp_p, *stcb, netp, to,
2683                     &notification, auth_skipped, auth_offset, auth_len,
2684                     mflowtype, mflowid,
2685                     vrf_id, port);
2686         }
2687
2688         if (*stcb == NULL) {
2689                 /* still no TCB... must be bad cookie-echo */
2690                 return (NULL);
2691         }
2692         if (*netp != NULL) {
2693                 (*netp)->flowtype = mflowtype;
2694                 (*netp)->flowid = mflowid;
2695         }
2696         /*
2697          * Ok, we built an association so confirm the address we sent the
2698          * INIT-ACK to.
2699          */
2700         netl = sctp_findnet(*stcb, to);
2701         /*
2702          * This code should in theory NOT run but
2703          */
2704         if (netl == NULL) {
2705                 /* TSNH! Huh, why do I need to add this address here? */
2706                 if (sctp_add_remote_addr(*stcb, to, NULL, port,
2707                     SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) {
2708                         return (NULL);
2709                 }
2710                 netl = sctp_findnet(*stcb, to);
2711         }
2712         if (netl) {
2713                 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) {
2714                         netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
2715                         (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL,
2716                             netl);
2717                         send_int_conf = 1;
2718                 }
2719         }
2720         sctp_start_net_timers(*stcb);
2721         if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
2722                 if (!had_a_existing_tcb ||
2723                     (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
2724                         /*
2725                          * If we have a NEW cookie or the connect never
2726                          * reached the connected state during collision we
2727                          * must do the TCP accept thing.
2728                          */
2729                         struct socket *so, *oso;
2730                         struct sctp_inpcb *inp;
2731
2732                         if (notification == SCTP_NOTIFY_ASSOC_RESTART) {
2733                                 /*
2734                                  * For a restart we will keep the same
2735                                  * socket, no need to do anything. I THINK!!
2736                                  */
2737                                 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2738                                 if (send_int_conf) {
2739                                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2740                                             (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2741                                 }
2742                                 return (m);
2743                         }
2744                         oso = (*inp_p)->sctp_socket;
2745                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2746                         SCTP_TCB_UNLOCK((*stcb));
2747                         CURVNET_SET(oso->so_vnet);
2748                         so = sonewconn(oso, 0
2749                             );
2750                         CURVNET_RESTORE();
2751                         SCTP_TCB_LOCK((*stcb));
2752                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2753
2754                         if (so == NULL) {
2755                                 struct mbuf *op_err;
2756 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2757                                 struct socket *pcb_so;
2758 #endif
2759                                 /* Too many sockets */
2760                                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n");
2761                                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2762                                 sctp_abort_association(*inp_p, NULL, m, iphlen,
2763                                     src, dst, sh, op_err,
2764                                     mflowtype, mflowid,
2765                                     vrf_id, port);
2766 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2767                                 pcb_so = SCTP_INP_SO(*inp_p);
2768                                 atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2769                                 SCTP_TCB_UNLOCK((*stcb));
2770                                 SCTP_SOCKET_LOCK(pcb_so, 1);
2771                                 SCTP_TCB_LOCK((*stcb));
2772                                 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2773 #endif
2774                                 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC,
2775                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_23);
2776 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2777                                 SCTP_SOCKET_UNLOCK(pcb_so, 1);
2778 #endif
2779                                 return (NULL);
2780                         }
2781                         inp = (struct sctp_inpcb *)so->so_pcb;
2782                         SCTP_INP_INCR_REF(inp);
2783                         /*
2784                          * We add the unbound flag here so that if we get an
2785                          * soabort() before we get the move_pcb done, we
2786                          * will properly cleanup.
2787                          */
2788                         inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE |
2789                             SCTP_PCB_FLAGS_CONNECTED |
2790                             SCTP_PCB_FLAGS_IN_TCPPOOL |
2791                             SCTP_PCB_FLAGS_UNBOUND |
2792                             (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) |
2793                             SCTP_PCB_FLAGS_DONT_WAKE);
2794                         inp->sctp_features = (*inp_p)->sctp_features;
2795                         inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features;
2796                         inp->sctp_socket = so;
2797                         inp->sctp_frag_point = (*inp_p)->sctp_frag_point;
2798                         inp->max_cwnd = (*inp_p)->max_cwnd;
2799                         inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off;
2800                         inp->ecn_supported = (*inp_p)->ecn_supported;
2801                         inp->prsctp_supported = (*inp_p)->prsctp_supported;
2802                         inp->auth_supported = (*inp_p)->auth_supported;
2803                         inp->asconf_supported = (*inp_p)->asconf_supported;
2804                         inp->reconfig_supported = (*inp_p)->reconfig_supported;
2805                         inp->nrsack_supported = (*inp_p)->nrsack_supported;
2806                         inp->pktdrop_supported = (*inp_p)->pktdrop_supported;
2807                         inp->partial_delivery_point = (*inp_p)->partial_delivery_point;
2808                         inp->sctp_context = (*inp_p)->sctp_context;
2809                         inp->local_strreset_support = (*inp_p)->local_strreset_support;
2810                         inp->fibnum = (*inp_p)->fibnum;
2811                         inp->inp_starting_point_for_iterator = NULL;
2812                         /*
2813                          * copy in the authentication parameters from the
2814                          * original endpoint
2815                          */
2816                         if (inp->sctp_ep.local_hmacs)
2817                                 sctp_free_hmaclist(inp->sctp_ep.local_hmacs);
2818                         inp->sctp_ep.local_hmacs =
2819                             sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs);
2820                         if (inp->sctp_ep.local_auth_chunks)
2821                                 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks);
2822                         inp->sctp_ep.local_auth_chunks =
2823                             sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks);
2824
2825                         /*
2826                          * Now we must move it from one hash table to
2827                          * another and get the tcb in the right place.
2828                          */
2829
2830                         /*
2831                          * This is where the one-2-one socket is put into
2832                          * the accept state waiting for the accept!
2833                          */
2834                         if (*stcb) {
2835                                 (*stcb)->asoc.state |= SCTP_STATE_IN_ACCEPT_QUEUE;
2836                         }
2837                         sctp_move_pcb_and_assoc(*inp_p, inp, *stcb);
2838
2839                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2840                         SCTP_TCB_UNLOCK((*stcb));
2841
2842                         sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb,
2843                             0);
2844                         SCTP_TCB_LOCK((*stcb));
2845                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2846
2847
2848                         /*
2849                          * now we must check to see if we were aborted while
2850                          * the move was going on and the lock/unlock
2851                          * happened.
2852                          */
2853                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
2854                                 /*
2855                                  * yep it was, we leave the assoc attached
2856                                  * to the socket since the sctp_inpcb_free()
2857                                  * call will send an abort for us.
2858                                  */
2859                                 SCTP_INP_DECR_REF(inp);
2860                                 return (NULL);
2861                         }
2862                         SCTP_INP_DECR_REF(inp);
2863                         /* Switch over to the new guy */
2864                         *inp_p = inp;
2865                         sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2866                         if (send_int_conf) {
2867                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2868                                     (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2869                         }
2870                         /*
2871                          * Pull it from the incomplete queue and wake the
2872                          * guy
2873                          */
2874 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2875                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2876                         SCTP_TCB_UNLOCK((*stcb));
2877                         SCTP_SOCKET_LOCK(so, 1);
2878 #endif
2879                         soisconnected(so);
2880 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2881                         SCTP_TCB_LOCK((*stcb));
2882                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2883                         SCTP_SOCKET_UNLOCK(so, 1);
2884 #endif
2885                         return (m);
2886                 }
2887         }
2888         if (notification) {
2889                 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2890         }
2891         if (send_int_conf) {
2892                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2893                     (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2894         }
2895         return (m);
2896 }
2897
2898 static void
2899 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED,
2900     struct sctp_tcb *stcb, struct sctp_nets *net)
2901 {
2902         /* cp must not be used, others call this without a c-ack :-) */
2903         struct sctp_association *asoc;
2904
2905         SCTPDBG(SCTP_DEBUG_INPUT2,
2906             "sctp_handle_cookie_ack: handling COOKIE-ACK\n");
2907         if ((stcb == NULL) || (net == NULL)) {
2908                 return;
2909         }
2910         asoc = &stcb->asoc;
2911
2912         sctp_stop_all_cookie_timers(stcb);
2913         /* process according to association state */
2914         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) {
2915                 /* state change only needed when I am in right state */
2916                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2917                 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
2918                 sctp_start_net_timers(stcb);
2919                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2920                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2921                             stcb->sctp_ep, stcb, asoc->primary_destination);
2922
2923                 }
2924                 /* update RTO */
2925                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
2926                 SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2927                 if (asoc->overall_error_count == 0) {
2928                         net->RTO = sctp_calculate_rto(stcb, asoc, net,
2929                             &asoc->time_entered, sctp_align_safe_nocopy,
2930                             SCTP_RTT_FROM_NON_DATA);
2931                 }
2932                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
2933                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2934                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2935                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
2936 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2937                         struct socket *so;
2938
2939 #endif
2940                         stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2941 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2942                         so = SCTP_INP_SO(stcb->sctp_ep);
2943                         atomic_add_int(&stcb->asoc.refcnt, 1);
2944                         SCTP_TCB_UNLOCK(stcb);
2945                         SCTP_SOCKET_LOCK(so, 1);
2946                         SCTP_TCB_LOCK(stcb);
2947                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
2948 #endif
2949                         if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) {
2950                                 soisconnected(stcb->sctp_socket);
2951                         }
2952 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2953                         SCTP_SOCKET_UNLOCK(so, 1);
2954 #endif
2955                 }
2956                 /*
2957                  * since we did not send a HB make sure we don't double
2958                  * things
2959                  */
2960                 net->hb_responded = 1;
2961
2962                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
2963                         /*
2964                          * We don't need to do the asconf thing, nor hb or
2965                          * autoclose if the socket is closed.
2966                          */
2967                         goto closed_socket;
2968                 }
2969                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
2970                     stcb, net);
2971
2972
2973                 if (stcb->asoc.sctp_autoclose_ticks &&
2974                     sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2975                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
2976                             stcb->sctp_ep, stcb, NULL);
2977                 }
2978                 /*
2979                  * send ASCONF if parameters are pending and ASCONFs are
2980                  * allowed (eg. addresses changed when init/cookie echo were
2981                  * in flight)
2982                  */
2983                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) &&
2984                     (stcb->asoc.asconf_supported == 1) &&
2985                     (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) {
2986 #ifdef SCTP_TIMER_BASED_ASCONF
2987                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF,
2988                             stcb->sctp_ep, stcb,
2989                             stcb->asoc.primary_destination);
2990 #else
2991                         sctp_send_asconf(stcb, stcb->asoc.primary_destination,
2992                             SCTP_ADDR_NOT_LOCKED);
2993 #endif
2994                 }
2995         }
2996 closed_socket:
2997         /* Toss the cookie if I can */
2998         sctp_toss_old_cookies(stcb, asoc);
2999         if (!TAILQ_EMPTY(&asoc->sent_queue)) {
3000                 /* Restart the timer if we have pending data */
3001                 struct sctp_tmit_chunk *chk;
3002
3003                 chk = TAILQ_FIRST(&asoc->sent_queue);
3004                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
3005         }
3006 }
3007
3008 static void
3009 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp,
3010     struct sctp_tcb *stcb)
3011 {
3012         struct sctp_nets *net;
3013         struct sctp_tmit_chunk *lchk;
3014         struct sctp_ecne_chunk bkup;
3015         uint8_t override_bit;
3016         uint32_t tsn, window_data_tsn;
3017         int len;
3018         unsigned int pkt_cnt;
3019
3020         len = ntohs(cp->ch.chunk_length);
3021         if ((len != sizeof(struct sctp_ecne_chunk)) &&
3022             (len != sizeof(struct old_sctp_ecne_chunk))) {
3023                 return;
3024         }
3025         if (len == sizeof(struct old_sctp_ecne_chunk)) {
3026                 /* Its the old format */
3027                 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk));
3028                 bkup.num_pkts_since_cwr = htonl(1);
3029                 cp = &bkup;
3030         }
3031         SCTP_STAT_INCR(sctps_recvecne);
3032         tsn = ntohl(cp->tsn);
3033         pkt_cnt = ntohl(cp->num_pkts_since_cwr);
3034         lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead);
3035         if (lchk == NULL) {
3036                 window_data_tsn = stcb->asoc.sending_seq - 1;
3037         } else {
3038                 window_data_tsn = lchk->rec.data.tsn;
3039         }
3040
3041         /* Find where it was sent to if possible. */
3042         net = NULL;
3043         TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) {
3044                 if (lchk->rec.data.tsn == tsn) {
3045                         net = lchk->whoTo;
3046                         net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send;
3047                         break;
3048                 }
3049                 if (SCTP_TSN_GT(lchk->rec.data.tsn, tsn)) {
3050                         break;
3051                 }
3052         }
3053         if (net == NULL) {
3054                 /*
3055                  * What to do. A previous send of a CWR was possibly lost.
3056                  * See how old it is, we may have it marked on the actual
3057                  * net.
3058                  */
3059                 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
3060                         if (tsn == net->last_cwr_tsn) {
3061                                 /* Found him, send it off */
3062                                 break;
3063                         }
3064                 }
3065                 if (net == NULL) {
3066                         /*
3067                          * If we reach here, we need to send a special CWR
3068                          * that says hey, we did this a long time ago and
3069                          * you lost the response.
3070                          */
3071                         net = TAILQ_FIRST(&stcb->asoc.nets);
3072                         if (net == NULL) {
3073                                 /* TSNH */
3074                                 return;
3075                         }
3076                         override_bit = SCTP_CWR_REDUCE_OVERRIDE;
3077                 } else {
3078                         override_bit = 0;
3079                 }
3080         } else {
3081                 override_bit = 0;
3082         }
3083         if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) &&
3084             ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
3085                 /*
3086                  * JRS - Use the congestion control given in the pluggable
3087                  * CC module
3088                  */
3089                 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt);
3090                 /*
3091                  * We reduce once every RTT. So we will only lower cwnd at
3092                  * the next sending seq i.e. the window_data_tsn
3093                  */
3094                 net->cwr_window_tsn = window_data_tsn;
3095                 net->ecn_ce_pkt_cnt += pkt_cnt;
3096                 net->lost_cnt = pkt_cnt;
3097                 net->last_cwr_tsn = tsn;
3098         } else {
3099                 override_bit |= SCTP_CWR_IN_SAME_WINDOW;
3100                 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) &&
3101                     ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
3102                         /*
3103                          * Another loss in the same window update how many
3104                          * marks/packets lost we have had.
3105                          */
3106                         int cnt = 1;
3107
3108                         if (pkt_cnt > net->lost_cnt) {
3109                                 /* Should be the case */
3110                                 cnt = (pkt_cnt - net->lost_cnt);
3111                                 net->ecn_ce_pkt_cnt += cnt;
3112                         }
3113                         net->lost_cnt = pkt_cnt;
3114                         net->last_cwr_tsn = tsn;
3115                         /*
3116                          * Most CC functions will ignore this call, since we
3117                          * are in-window yet of the initial CE the peer saw.
3118                          */
3119                         stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt);
3120                 }
3121         }
3122         /*
3123          * We always send a CWR this way if our previous one was lost our
3124          * peer will get an update, or if it is not time again to reduce we
3125          * still get the cwr to the peer. Note we set the override when we
3126          * could not find the TSN on the chunk or the destination network.
3127          */
3128         sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit);
3129 }
3130
3131 static void
3132 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net)
3133 {
3134         /*
3135          * Here we get a CWR from the peer. We must look in the outqueue and
3136          * make sure that we have a covered ECNE in the control chunk part.
3137          * If so remove it.
3138          */
3139         struct sctp_tmit_chunk *chk;
3140         struct sctp_ecne_chunk *ecne;
3141         int override;
3142         uint32_t cwr_tsn;
3143
3144         cwr_tsn = ntohl(cp->tsn);
3145         override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE;
3146         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
3147                 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) {
3148                         continue;
3149                 }
3150                 if ((override == 0) && (chk->whoTo != net)) {
3151                         /* Must be from the right src unless override is set */
3152                         continue;
3153                 }
3154                 ecne = mtod(chk->data, struct sctp_ecne_chunk *);
3155                 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) {
3156                         /* this covers this ECNE, we can remove it */
3157                         stcb->asoc.ecn_echo_cnt_onq--;
3158                         TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk,
3159                             sctp_next);
3160                         sctp_m_freem(chk->data);
3161                         chk->data = NULL;
3162                         stcb->asoc.ctrl_queue_cnt--;
3163                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3164                         if (override == 0) {
3165                                 break;
3166                         }
3167                 }
3168         }
3169 }
3170
3171 static void
3172 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED,
3173     struct sctp_tcb *stcb, struct sctp_nets *net)
3174 {
3175         struct sctp_association *asoc;
3176 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3177         struct socket *so;
3178 #endif
3179
3180         SCTPDBG(SCTP_DEBUG_INPUT2,
3181             "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n");
3182         if (stcb == NULL)
3183                 return;
3184
3185         asoc = &stcb->asoc;
3186         /* process according to association state */
3187         if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
3188                 /* unexpected SHUTDOWN-COMPLETE... so ignore... */
3189                 SCTPDBG(SCTP_DEBUG_INPUT2,
3190                     "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n");
3191                 SCTP_TCB_UNLOCK(stcb);
3192                 return;
3193         }
3194         /* notify upper layer protocol */
3195         if (stcb->sctp_socket) {
3196                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
3197         }
3198 #ifdef INVARIANTS
3199         if (!TAILQ_EMPTY(&asoc->send_queue) ||
3200             !TAILQ_EMPTY(&asoc->sent_queue) ||
3201             sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) {
3202                 panic("Queues are not empty when handling SHUTDOWN-COMPLETE");
3203         }
3204 #endif
3205         /* stop the timer */
3206         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net,
3207             SCTP_FROM_SCTP_INPUT + SCTP_LOC_24);
3208         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
3209         /* free the TCB */
3210         SCTPDBG(SCTP_DEBUG_INPUT2,
3211             "sctp_handle_shutdown_complete: calls free-asoc\n");
3212 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3213         so = SCTP_INP_SO(stcb->sctp_ep);
3214         atomic_add_int(&stcb->asoc.refcnt, 1);
3215         SCTP_TCB_UNLOCK(stcb);
3216         SCTP_SOCKET_LOCK(so, 1);
3217         SCTP_TCB_LOCK(stcb);
3218         atomic_subtract_int(&stcb->asoc.refcnt, 1);
3219 #endif
3220         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
3221             SCTP_FROM_SCTP_INPUT + SCTP_LOC_25);
3222 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3223         SCTP_SOCKET_UNLOCK(so, 1);
3224 #endif
3225         return;
3226 }
3227
3228 static int
3229 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc,
3230     struct sctp_nets *net, uint8_t flg)
3231 {
3232         switch (desc->chunk_type) {
3233         case SCTP_DATA:
3234                 /* find the tsn to resend (possibly */
3235                 {
3236                         uint32_t tsn;
3237                         struct sctp_tmit_chunk *tp1;
3238
3239                         tsn = ntohl(desc->tsn_ifany);
3240                         TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3241                                 if (tp1->rec.data.tsn == tsn) {
3242                                         /* found it */
3243                                         break;
3244                                 }
3245                                 if (SCTP_TSN_GT(tp1->rec.data.tsn, tsn)) {
3246                                         /* not found */
3247                                         tp1 = NULL;
3248                                         break;
3249                                 }
3250                         }
3251                         if (tp1 == NULL) {
3252                                 /*
3253                                  * Do it the other way , aka without paying
3254                                  * attention to queue seq order.
3255                                  */
3256                                 SCTP_STAT_INCR(sctps_pdrpdnfnd);
3257                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3258                                         if (tp1->rec.data.tsn == tsn) {
3259                                                 /* found it */
3260                                                 break;
3261                                         }
3262                                 }
3263                         }
3264                         if (tp1 == NULL) {
3265                                 SCTP_STAT_INCR(sctps_pdrptsnnf);
3266                         }
3267                         if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) {
3268                                 uint8_t *ddp;
3269
3270                                 if (((flg & SCTP_BADCRC) == 0) &&
3271                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3272                                         return (0);
3273                                 }
3274                                 if ((stcb->asoc.peers_rwnd == 0) &&
3275                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3276                                         SCTP_STAT_INCR(sctps_pdrpdiwnp);
3277                                         return (0);
3278                                 }
3279                                 if (stcb->asoc.peers_rwnd == 0 &&
3280                                     (flg & SCTP_FROM_MIDDLE_BOX)) {
3281                                         SCTP_STAT_INCR(sctps_pdrpdizrw);
3282                                         return (0);
3283                                 }
3284                                 ddp = (uint8_t *)(mtod(tp1->data, caddr_t)+
3285                                     sizeof(struct sctp_data_chunk));
3286                                 {
3287                                         unsigned int iii;
3288
3289                                         for (iii = 0; iii < sizeof(desc->data_bytes);
3290                                             iii++) {
3291                                                 if (ddp[iii] != desc->data_bytes[iii]) {
3292                                                         SCTP_STAT_INCR(sctps_pdrpbadd);
3293                                                         return (-1);
3294                                                 }
3295                                         }
3296                                 }
3297
3298                                 if (tp1->do_rtt) {
3299                                         /*
3300                                          * this guy had a RTO calculation
3301                                          * pending on it, cancel it
3302                                          */
3303                                         if (tp1->whoTo->rto_needed == 0) {
3304                                                 tp1->whoTo->rto_needed = 1;
3305                                         }
3306                                         tp1->do_rtt = 0;
3307                                 }
3308                                 SCTP_STAT_INCR(sctps_pdrpmark);
3309                                 if (tp1->sent != SCTP_DATAGRAM_RESEND)
3310                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3311                                 /*
3312                                  * mark it as if we were doing a FR, since
3313                                  * we will be getting gap ack reports behind
3314                                  * the info from the router.
3315                                  */
3316                                 tp1->rec.data.doing_fast_retransmit = 1;
3317                                 /*
3318                                  * mark the tsn with what sequences can
3319                                  * cause a new FR.
3320                                  */
3321                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) {
3322                                         tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
3323                                 } else {
3324                                         tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.tsn;
3325                                 }
3326
3327                                 /* restart the timer */
3328                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3329                                     stcb, tp1->whoTo,
3330                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_26);
3331                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3332                                     stcb, tp1->whoTo);
3333
3334                                 /* fix counts and things */
3335                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
3336                                         sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP,
3337                                             tp1->whoTo->flight_size,
3338                                             tp1->book_size,
3339                                             (uint32_t)(uintptr_t)stcb,
3340                                             tp1->rec.data.tsn);
3341                                 }
3342                                 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
3343                                         sctp_flight_size_decrease(tp1);
3344                                         sctp_total_flight_decrease(stcb, tp1);
3345                                 }
3346                                 tp1->sent = SCTP_DATAGRAM_RESEND;
3347                         } {
3348                                 /* audit code */
3349                                 unsigned int audit;
3350
3351                                 audit = 0;
3352                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3353                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3354                                                 audit++;
3355                                 }
3356                                 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue,
3357                                     sctp_next) {
3358                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3359                                                 audit++;
3360                                 }
3361                                 if (audit != stcb->asoc.sent_queue_retran_cnt) {
3362                                         SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n",
3363                                             audit, stcb->asoc.sent_queue_retran_cnt);
3364 #ifndef SCTP_AUDITING_ENABLED
3365                                         stcb->asoc.sent_queue_retran_cnt = audit;
3366 #endif
3367                                 }
3368                         }
3369                 }
3370                 break;
3371         case SCTP_ASCONF:
3372                 {
3373                         struct sctp_tmit_chunk *asconf;
3374
3375                         TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue,
3376                             sctp_next) {
3377                                 if (asconf->rec.chunk_id.id == SCTP_ASCONF) {
3378                                         break;
3379                                 }
3380                         }
3381                         if (asconf) {
3382                                 if (asconf->sent != SCTP_DATAGRAM_RESEND)
3383                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3384                                 asconf->sent = SCTP_DATAGRAM_RESEND;
3385                                 asconf->snd_count--;
3386                         }
3387                 }
3388                 break;
3389         case SCTP_INITIATION:
3390                 /* resend the INIT */
3391                 stcb->asoc.dropped_special_cnt++;
3392                 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) {
3393                         /*
3394                          * If we can get it in, in a few attempts we do
3395                          * this, otherwise we let the timer fire.
3396                          */
3397                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep,
3398                             stcb, net,
3399                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_27);
3400                         sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
3401                 }
3402                 break;
3403         case SCTP_SELECTIVE_ACK:
3404         case SCTP_NR_SELECTIVE_ACK:
3405                 /* resend the sack */
3406                 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED);
3407                 break;
3408         case SCTP_HEARTBEAT_REQUEST:
3409                 /* resend a demand HB */
3410                 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) {
3411                         /*
3412                          * Only retransmit if we KNOW we wont destroy the
3413                          * tcb
3414                          */
3415                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
3416                 }
3417                 break;
3418         case SCTP_SHUTDOWN:
3419                 sctp_send_shutdown(stcb, net);
3420                 break;
3421         case SCTP_SHUTDOWN_ACK:
3422                 sctp_send_shutdown_ack(stcb, net);
3423                 break;
3424         case SCTP_COOKIE_ECHO:
3425                 {
3426                         struct sctp_tmit_chunk *cookie;
3427
3428                         cookie = NULL;
3429                         TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue,
3430                             sctp_next) {
3431                                 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
3432                                         break;
3433                                 }
3434                         }
3435                         if (cookie) {
3436                                 if (cookie->sent != SCTP_DATAGRAM_RESEND)
3437                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3438                                 cookie->sent = SCTP_DATAGRAM_RESEND;
3439                                 sctp_stop_all_cookie_timers(stcb);
3440                         }
3441                 }
3442                 break;
3443         case SCTP_COOKIE_ACK:
3444                 sctp_send_cookie_ack(stcb);
3445                 break;
3446         case SCTP_ASCONF_ACK:
3447                 /* resend last asconf ack */
3448                 sctp_send_asconf_ack(stcb);
3449                 break;
3450         case SCTP_IFORWARD_CUM_TSN:
3451         case SCTP_FORWARD_CUM_TSN:
3452                 send_forward_tsn(stcb, &stcb->asoc);
3453                 break;
3454                 /* can't do anything with these */
3455         case SCTP_PACKET_DROPPED:
3456         case SCTP_INITIATION_ACK:       /* this should not happen */
3457         case SCTP_HEARTBEAT_ACK:
3458         case SCTP_ABORT_ASSOCIATION:
3459         case SCTP_OPERATION_ERROR:
3460         case SCTP_SHUTDOWN_COMPLETE:
3461         case SCTP_ECN_ECHO:
3462         case SCTP_ECN_CWR:
3463         default:
3464                 break;
3465         }
3466         return (0);
3467 }
3468
3469 void
3470 sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list)
3471 {
3472         uint32_t i;
3473         uint16_t temp;
3474
3475         /*
3476          * We set things to 0xffffffff since this is the last delivered
3477          * sequence and we will be sending in 0 after the reset.
3478          */
3479
3480         if (number_entries) {
3481                 for (i = 0; i < number_entries; i++) {
3482                         temp = ntohs(list[i]);
3483                         if (temp >= stcb->asoc.streamincnt) {
3484                                 continue;
3485                         }
3486                         stcb->asoc.strmin[temp].last_mid_delivered = 0xffffffff;
3487                 }
3488         } else {
3489                 list = NULL;
3490                 for (i = 0; i < stcb->asoc.streamincnt; i++) {
3491                         stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff;
3492                 }
3493         }
3494         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3495 }
3496
3497 static void
3498 sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list)
3499 {
3500         uint32_t i;
3501         uint16_t temp;
3502
3503         if (number_entries > 0) {
3504                 for (i = 0; i < number_entries; i++) {
3505                         temp = ntohs(list[i]);
3506                         if (temp >= stcb->asoc.streamoutcnt) {
3507                                 /* no such stream */
3508                                 continue;
3509                         }
3510                         stcb->asoc.strmout[temp].next_mid_ordered = 0;
3511                         stcb->asoc.strmout[temp].next_mid_unordered = 0;
3512                 }
3513         } else {
3514                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3515                         stcb->asoc.strmout[i].next_mid_ordered = 0;
3516                         stcb->asoc.strmout[i].next_mid_unordered = 0;
3517                 }
3518         }
3519         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3520 }
3521
3522 static void
3523 sctp_reset_clear_pending(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list)
3524 {
3525         uint32_t i;
3526         uint16_t temp;
3527
3528         if (number_entries > 0) {
3529                 for (i = 0; i < number_entries; i++) {
3530                         temp = ntohs(list[i]);
3531                         if (temp >= stcb->asoc.streamoutcnt) {
3532                                 /* no such stream */
3533                                 continue;
3534                         }
3535                         stcb->asoc.strmout[temp].state = SCTP_STREAM_OPEN;
3536                 }
3537         } else {
3538                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3539                         stcb->asoc.strmout[i].state = SCTP_STREAM_OPEN;
3540                 }
3541         }
3542 }
3543
3544
3545 struct sctp_stream_reset_request *
3546 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk)
3547 {
3548         struct sctp_association *asoc;
3549         struct sctp_chunkhdr *ch;
3550         struct sctp_stream_reset_request *r;
3551         struct sctp_tmit_chunk *chk;
3552         int len, clen;
3553
3554         asoc = &stcb->asoc;
3555         if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
3556                 asoc->stream_reset_outstanding = 0;
3557                 return (NULL);
3558         }
3559         if (stcb->asoc.str_reset == NULL) {
3560                 asoc->stream_reset_outstanding = 0;
3561                 return (NULL);
3562         }
3563         chk = stcb->asoc.str_reset;
3564         if (chk->data == NULL) {
3565                 return (NULL);
3566         }
3567         if (bchk) {
3568                 /* he wants a copy of the chk pointer */
3569                 *bchk = chk;
3570         }
3571         clen = chk->send_size;
3572         ch = mtod(chk->data, struct sctp_chunkhdr *);
3573         r = (struct sctp_stream_reset_request *)(ch + 1);
3574         if (ntohl(r->request_seq) == seq) {
3575                 /* found it */
3576                 return (r);
3577         }
3578         len = SCTP_SIZE32(ntohs(r->ph.param_length));
3579         if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) {
3580                 /* move to the next one, there can only be a max of two */
3581                 r = (struct sctp_stream_reset_request *)((caddr_t)r + len);
3582                 if (ntohl(r->request_seq) == seq) {
3583                         return (r);
3584                 }
3585         }
3586         /* that seq is not here */
3587         return (NULL);
3588 }
3589
3590 static void
3591 sctp_clean_up_stream_reset(struct sctp_tcb *stcb)
3592 {
3593         struct sctp_association *asoc;
3594         struct sctp_tmit_chunk *chk = stcb->asoc.str_reset;
3595
3596         if (stcb->asoc.str_reset == NULL) {
3597                 return;
3598         }
3599         asoc = &stcb->asoc;
3600
3601         sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb,
3602             chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_28);
3603         TAILQ_REMOVE(&asoc->control_send_queue,
3604             chk,
3605             sctp_next);
3606         if (chk->data) {
3607                 sctp_m_freem(chk->data);
3608                 chk->data = NULL;
3609         }
3610         asoc->ctrl_queue_cnt--;
3611         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3612         /* sa_ignore NO_NULL_CHK */
3613         stcb->asoc.str_reset = NULL;
3614 }
3615
3616
3617 static int
3618 sctp_handle_stream_reset_response(struct sctp_tcb *stcb,
3619     uint32_t seq, uint32_t action,
3620     struct sctp_stream_reset_response *respin)
3621 {
3622         uint16_t type;
3623         int lparam_len;
3624         struct sctp_association *asoc = &stcb->asoc;
3625         struct sctp_tmit_chunk *chk;
3626         struct sctp_stream_reset_request *req_param;
3627         struct sctp_stream_reset_out_request *req_out_param;
3628         struct sctp_stream_reset_in_request *req_in_param;
3629         uint32_t number_entries;
3630
3631         if (asoc->stream_reset_outstanding == 0) {
3632                 /* duplicate */
3633                 return (0);
3634         }
3635         if (seq == stcb->asoc.str_reset_seq_out) {
3636                 req_param = sctp_find_stream_reset(stcb, seq, &chk);
3637                 if (req_param != NULL) {
3638                         stcb->asoc.str_reset_seq_out++;
3639                         type = ntohs(req_param->ph.param_type);
3640                         lparam_len = ntohs(req_param->ph.param_length);
3641                         if (type == SCTP_STR_RESET_OUT_REQUEST) {
3642                                 int no_clear = 0;
3643
3644                                 req_out_param = (struct sctp_stream_reset_out_request *)req_param;
3645                                 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t);
3646                                 asoc->stream_reset_out_is_outstanding = 0;
3647                                 if (asoc->stream_reset_outstanding)
3648                                         asoc->stream_reset_outstanding--;
3649                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3650                                         /* do it */
3651                                         sctp_reset_out_streams(stcb, number_entries, req_out_param->list_of_streams);
3652                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3653                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3654                                 } else if (action == SCTP_STREAM_RESET_RESULT_IN_PROGRESS) {
3655                                         /*
3656                                          * Set it up so we don't stop
3657                                          * retransmitting
3658                                          */
3659                                         asoc->stream_reset_outstanding++;
3660                                         stcb->asoc.str_reset_seq_out--;
3661                                         asoc->stream_reset_out_is_outstanding = 1;
3662                                         no_clear = 1;
3663                                 } else {
3664                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3665                                 }
3666                                 if (no_clear == 0) {
3667                                         sctp_reset_clear_pending(stcb, number_entries, req_out_param->list_of_streams);
3668                                 }
3669                         } else if (type == SCTP_STR_RESET_IN_REQUEST) {
3670                                 req_in_param = (struct sctp_stream_reset_in_request *)req_param;
3671                                 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t);
3672                                 if (asoc->stream_reset_outstanding)
3673                                         asoc->stream_reset_outstanding--;
3674                                 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3675                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb,
3676                                             number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3677                                 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3678                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb,
3679                                             number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3680                                 }
3681                         } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) {
3682                                 /* Ok we now may have more streams */
3683                                 int num_stream;
3684
3685                                 num_stream = stcb->asoc.strm_pending_add_size;
3686                                 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) {
3687                                         /* TSNH */
3688                                         num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt;
3689                                 }
3690                                 stcb->asoc.strm_pending_add_size = 0;
3691                                 if (asoc->stream_reset_outstanding)
3692                                         asoc->stream_reset_outstanding--;
3693                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3694                                         /* Put the new streams into effect */
3695                                         int i;
3696
3697                                         for (i = asoc->streamoutcnt; i < (asoc->streamoutcnt + num_stream); i++) {
3698                                                 asoc->strmout[i].state = SCTP_STREAM_OPEN;
3699                                         }
3700                                         asoc->streamoutcnt += num_stream;
3701                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
3702                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3703                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3704                                             SCTP_STREAM_CHANGE_DENIED);
3705                                 } else {
3706                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3707                                             SCTP_STREAM_CHANGE_FAILED);
3708                                 }
3709                         } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) {
3710                                 if (asoc->stream_reset_outstanding)
3711                                         asoc->stream_reset_outstanding--;
3712                                 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3713                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3714                                             SCTP_STREAM_CHANGE_DENIED);
3715                                 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3716                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3717                                             SCTP_STREAM_CHANGE_FAILED);
3718                                 }
3719                         } else if (type == SCTP_STR_RESET_TSN_REQUEST) {
3720                                 /**
3721                                  * a) Adopt the new in tsn.
3722                                  * b) reset the map
3723                                  * c) Adopt the new out-tsn
3724                                  */
3725                                 struct sctp_stream_reset_response_tsn *resp;
3726                                 struct sctp_forward_tsn_chunk fwdtsn;
3727                                 int abort_flag = 0;
3728
3729                                 if (respin == NULL) {
3730                                         /* huh ? */
3731                                         return (0);
3732                                 }
3733                                 if (ntohs(respin->ph.param_length) < sizeof(struct sctp_stream_reset_response_tsn)) {
3734                                         return (0);
3735                                 }
3736                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3737                                         resp = (struct sctp_stream_reset_response_tsn *)respin;
3738                                         asoc->stream_reset_outstanding--;
3739                                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3740                                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3741                                         fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1);
3742                                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3743                                         if (abort_flag) {
3744                                                 return (1);
3745                                         }
3746                                         stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1);
3747                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3748                                                 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3749                                         }
3750                                         stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map;
3751                                         stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn);
3752                                         memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size);
3753
3754                                         stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map;
3755                                         memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size);
3756
3757                                         stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn);
3758                                         stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn;
3759
3760                                         sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL);
3761                                         sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL);
3762                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0);
3763                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3764                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
3765                                             SCTP_ASSOC_RESET_DENIED);
3766                                 } else {
3767                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
3768                                             SCTP_ASSOC_RESET_FAILED);
3769                                 }
3770                         }
3771                         /* get rid of the request and get the request flags */
3772                         if (asoc->stream_reset_outstanding == 0) {
3773                                 sctp_clean_up_stream_reset(stcb);
3774                         }
3775                 }
3776         }
3777         if (asoc->stream_reset_outstanding == 0) {
3778                 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED);
3779         }
3780         return (0);
3781 }
3782
3783 static void
3784 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb,
3785     struct sctp_tmit_chunk *chk,
3786     struct sctp_stream_reset_in_request *req, int trunc)
3787 {
3788         uint32_t seq;
3789         int len, i;
3790         int number_entries;
3791         uint16_t temp;
3792
3793         /*
3794          * peer wants me to send a str-reset to him for my outgoing seq's if
3795          * seq_in is right.
3796          */
3797         struct sctp_association *asoc = &stcb->asoc;
3798
3799         seq = ntohl(req->request_seq);
3800         if (asoc->str_reset_seq_in == seq) {
3801                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3802                 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
3803                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3804                 } else if (trunc) {
3805                         /* Can't do it, since they exceeded our buffer size  */
3806                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3807                 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) {
3808                         len = ntohs(req->ph.param_length);
3809                         number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t));
3810                         if (number_entries) {
3811                                 for (i = 0; i < number_entries; i++) {
3812                                         temp = ntohs(req->list_of_streams[i]);
3813                                         if (temp >= stcb->asoc.streamoutcnt) {
3814                                                 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3815                                                 goto bad_boy;
3816                                         }
3817                                         req->list_of_streams[i] = temp;
3818                                 }
3819                                 for (i = 0; i < number_entries; i++) {
3820                                         if (stcb->asoc.strmout[req->list_of_streams[i]].state == SCTP_STREAM_OPEN) {
3821                                                 stcb->asoc.strmout[req->list_of_streams[i]].state = SCTP_STREAM_RESET_PENDING;
3822                                         }
3823                                 }
3824                         } else {
3825                                 /* Its all */
3826                                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3827                                         if (stcb->asoc.strmout[i].state == SCTP_STREAM_OPEN)
3828                                                 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_PENDING;
3829                                 }
3830                         }
3831                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3832                 } else {
3833                         /* Can't do it, since we have sent one out */
3834                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
3835                 }
3836 bad_boy:
3837                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3838                 asoc->str_reset_seq_in++;
3839         } else if (asoc->str_reset_seq_in - 1 == seq) {
3840                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3841         } else if (asoc->str_reset_seq_in - 2 == seq) {
3842                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3843         } else {
3844                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3845         }
3846         sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED);
3847 }
3848
3849 static int
3850 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb,
3851     struct sctp_tmit_chunk *chk,
3852     struct sctp_stream_reset_tsn_request *req)
3853 {
3854         /* reset all in and out and update the tsn */
3855         /*
3856          * A) reset my str-seq's on in and out. B) Select a receive next,
3857          * and set cum-ack to it. Also process this selected number as a
3858          * fwd-tsn as well. C) set in the response my next sending seq.
3859          */
3860         struct sctp_forward_tsn_chunk fwdtsn;
3861         struct sctp_association *asoc = &stcb->asoc;
3862         int abort_flag = 0;
3863         uint32_t seq;
3864
3865         seq = ntohl(req->request_seq);
3866         if (asoc->str_reset_seq_in == seq) {
3867                 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0];
3868                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
3869                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3870                 } else {
3871                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3872                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3873                         fwdtsn.ch.chunk_flags = 0;
3874                         fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1);
3875                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3876                         if (abort_flag) {
3877                                 return (1);
3878                         }
3879                         asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA;
3880                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3881                                 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3882                         }
3883                         asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map;
3884                         asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1;
3885                         memset(asoc->mapping_array, 0, asoc->mapping_array_size);
3886                         asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
3887                         memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size);
3888                         atomic_add_int(&asoc->sending_seq, 1);
3889                         /* save off historical data for retrans */
3890                         asoc->last_sending_seq[1] = asoc->last_sending_seq[0];
3891                         asoc->last_sending_seq[0] = asoc->sending_seq;
3892                         asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0];
3893                         asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn;
3894                         sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL);
3895                         sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL);
3896                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3897                         sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0);
3898                 }
3899                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3900                     asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
3901                 asoc->str_reset_seq_in++;
3902         } else if (asoc->str_reset_seq_in - 1 == seq) {
3903                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3904                     asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
3905         } else if (asoc->str_reset_seq_in - 2 == seq) {
3906                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1],
3907                     asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]);
3908         } else {
3909                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3910         }
3911         return (0);
3912 }
3913
3914 static void
3915 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb,
3916     struct sctp_tmit_chunk *chk,
3917     struct sctp_stream_reset_out_request *req, int trunc)
3918 {
3919         uint32_t seq, tsn;
3920         int number_entries, len;
3921         struct sctp_association *asoc = &stcb->asoc;
3922
3923         seq = ntohl(req->request_seq);
3924
3925         /* now if its not a duplicate we process it */
3926         if (asoc->str_reset_seq_in == seq) {
3927                 len = ntohs(req->ph.param_length);
3928                 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t));
3929                 /*
3930                  * the sender is resetting, handle the list issue.. we must
3931                  * a) verify if we can do the reset, if so no problem b) If
3932                  * we can't do the reset we must copy the request. c) queue
3933                  * it, and setup the data in processor to trigger it off
3934                  * when needed and dequeue all the queued data.
3935                  */
3936                 tsn = ntohl(req->send_reset_at_tsn);
3937
3938                 /* move the reset action back one */
3939                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3940                 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
3941                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3942                 } else if (trunc) {
3943                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3944                 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) {
3945                         /* we can do it now */
3946                         sctp_reset_in_stream(stcb, number_entries, req->list_of_streams);
3947                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3948                 } else {
3949                         /*
3950                          * we must queue it up and thus wait for the TSN's
3951                          * to arrive that are at or before tsn
3952                          */
3953                         struct sctp_stream_reset_list *liste;
3954                         int siz;
3955
3956                         siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t));
3957                         SCTP_MALLOC(liste, struct sctp_stream_reset_list *,
3958                             siz, SCTP_M_STRESET);
3959                         if (liste == NULL) {
3960                                 /* gak out of memory */
3961                                 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3962                                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3963                                 return;
3964                         }
3965                         liste->seq = seq;
3966                         liste->tsn = tsn;
3967                         liste->number_entries = number_entries;
3968                         memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t));
3969                         TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp);
3970                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_IN_PROGRESS;
3971                 }
3972                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3973                 asoc->str_reset_seq_in++;
3974         } else if ((asoc->str_reset_seq_in - 1) == seq) {
3975                 /*
3976                  * one seq back, just echo back last action since my
3977                  * response was lost.
3978                  */
3979                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3980         } else if ((asoc->str_reset_seq_in - 2) == seq) {
3981                 /*
3982                  * two seq back, just echo back last action since my
3983                  * response was lost.
3984                  */
3985                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3986         } else {
3987                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3988         }
3989 }
3990
3991 static void
3992 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
3993     struct sctp_stream_reset_add_strm *str_add)
3994 {
3995         /*
3996          * Peer is requesting to add more streams. If its within our
3997          * max-streams we will allow it.
3998          */
3999         uint32_t num_stream, i;
4000         uint32_t seq;
4001         struct sctp_association *asoc = &stcb->asoc;
4002         struct sctp_queued_to_read *ctl, *nctl;
4003
4004         /* Get the number. */
4005         seq = ntohl(str_add->request_seq);
4006         num_stream = ntohs(str_add->number_of_streams);
4007         /* Now what would be the new total? */
4008         if (asoc->str_reset_seq_in == seq) {
4009                 num_stream += stcb->asoc.streamincnt;
4010                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
4011                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
4012                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4013                 } else if ((num_stream > stcb->asoc.max_inbound_streams) ||
4014                     (num_stream > 0xffff)) {
4015                         /* We must reject it they ask for to many */
4016         denied:
4017                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4018                 } else {
4019                         /* Ok, we can do that :-) */
4020                         struct sctp_stream_in *oldstrm;
4021
4022                         /* save off the old */
4023                         oldstrm = stcb->asoc.strmin;
4024                         SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *,
4025                             (num_stream * sizeof(struct sctp_stream_in)),
4026                             SCTP_M_STRMI);
4027                         if (stcb->asoc.strmin == NULL) {
4028                                 stcb->asoc.strmin = oldstrm;
4029                                 goto denied;
4030                         }
4031                         /* copy off the old data */
4032                         for (i = 0; i < stcb->asoc.streamincnt; i++) {
4033                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
4034                                 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue);
4035                                 stcb->asoc.strmin[i].sid = i;
4036                                 stcb->asoc.strmin[i].last_mid_delivered = oldstrm[i].last_mid_delivered;
4037                                 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started;
4038                                 stcb->asoc.strmin[i].pd_api_started = oldstrm[i].pd_api_started;
4039                                 /* now anything on those queues? */
4040                                 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next_instrm, nctl) {
4041                                         TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next_instrm);
4042                                         TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next_instrm);
4043                                 }
4044                                 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].uno_inqueue, next_instrm, nctl) {
4045                                         TAILQ_REMOVE(&oldstrm[i].uno_inqueue, ctl, next_instrm);
4046                                         TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].uno_inqueue, ctl, next_instrm);
4047                                 }
4048                         }
4049                         /* Init the new streams */
4050                         for (i = stcb->asoc.streamincnt; i < num_stream; i++) {
4051                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
4052                                 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue);
4053                                 stcb->asoc.strmin[i].sid = i;
4054                                 stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff;
4055                                 stcb->asoc.strmin[i].pd_api_started = 0;
4056                                 stcb->asoc.strmin[i].delivery_started = 0;
4057                         }
4058                         SCTP_FREE(oldstrm, SCTP_M_STRMI);
4059                         /* update the size */
4060                         stcb->asoc.streamincnt = num_stream;
4061                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
4062                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
4063                 }
4064                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4065                 asoc->str_reset_seq_in++;
4066         } else if ((asoc->str_reset_seq_in - 1) == seq) {
4067                 /*
4068                  * one seq back, just echo back last action since my
4069                  * response was lost.
4070                  */
4071                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4072         } else if ((asoc->str_reset_seq_in - 2) == seq) {
4073                 /*
4074                  * two seq back, just echo back last action since my
4075                  * response was lost.
4076                  */
4077                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
4078         } else {
4079                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
4080
4081         }
4082 }
4083
4084 static void
4085 sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
4086     struct sctp_stream_reset_add_strm *str_add)
4087 {
4088         /*
4089          * Peer is requesting to add more streams. If its within our
4090          * max-streams we will allow it.
4091          */
4092         uint16_t num_stream;
4093         uint32_t seq;
4094         struct sctp_association *asoc = &stcb->asoc;
4095
4096         /* Get the number. */
4097         seq = ntohl(str_add->request_seq);
4098         num_stream = ntohs(str_add->number_of_streams);
4099         /* Now what would be the new total? */
4100         if (asoc->str_reset_seq_in == seq) {
4101                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
4102                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
4103                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4104                 } else if (stcb->asoc.stream_reset_outstanding) {
4105                         /* We must reject it we have something pending */
4106                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
4107                 } else {
4108                         /* Ok, we can do that :-) */
4109                         int mychk;
4110
4111                         mychk = stcb->asoc.streamoutcnt;
4112                         mychk += num_stream;
4113                         if (mychk < 0x10000) {
4114                                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
4115                                 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 1, num_stream, 0, 1)) {
4116                                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4117                                 }
4118                         } else {
4119                                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4120                         }
4121                 }
4122                 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]);
4123                 asoc->str_reset_seq_in++;
4124         } else if ((asoc->str_reset_seq_in - 1) == seq) {
4125                 /*
4126                  * one seq back, just echo back last action since my
4127                  * response was lost.
4128                  */
4129                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4130         } else if ((asoc->str_reset_seq_in - 2) == seq) {
4131                 /*
4132                  * two seq back, just echo back last action since my
4133                  * response was lost.
4134                  */
4135                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
4136         } else {
4137                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
4138         }
4139 }
4140
4141 #ifdef __GNUC__
4142 __attribute__((noinline))
4143 #endif
4144 static int
4145 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset,
4146     struct sctp_chunkhdr *ch_req)
4147 {
4148         uint16_t remaining_length, param_len, ptype;
4149         struct sctp_paramhdr pstore;
4150         uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE];
4151         uint32_t seq = 0;
4152         int num_req = 0;
4153         int trunc = 0;
4154         struct sctp_tmit_chunk *chk;
4155         struct sctp_chunkhdr *ch;
4156         struct sctp_paramhdr *ph;
4157         int ret_code = 0;
4158         int num_param = 0;
4159
4160         /* now it may be a reset or a reset-response */
4161         remaining_length = ntohs(ch_req->chunk_length) - sizeof(struct sctp_chunkhdr);
4162
4163         /* setup for adding the response */
4164         sctp_alloc_a_chunk(stcb, chk);
4165         if (chk == NULL) {
4166                 return (ret_code);
4167         }
4168         chk->copy_by_ref = 0;
4169         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
4170         chk->rec.chunk_id.can_take_data = 0;
4171         chk->flags = 0;
4172         chk->asoc = &stcb->asoc;
4173         chk->no_fr_allowed = 0;
4174         chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr);
4175         chk->book_size_scale = 0;
4176         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
4177         if (chk->data == NULL) {
4178 strres_nochunk:
4179                 if (chk->data) {
4180                         sctp_m_freem(chk->data);
4181                         chk->data = NULL;
4182                 }
4183                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
4184                 return (ret_code);
4185         }
4186         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
4187
4188         /* setup chunk parameters */
4189         chk->sent = SCTP_DATAGRAM_UNSENT;
4190         chk->snd_count = 0;
4191         chk->whoTo = NULL;
4192
4193         ch = mtod(chk->data, struct sctp_chunkhdr *);
4194         ch->chunk_type = SCTP_STREAM_RESET;
4195         ch->chunk_flags = 0;
4196         ch->chunk_length = htons(chk->send_size);
4197         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
4198         offset += sizeof(struct sctp_chunkhdr);
4199         while (remaining_length >= sizeof(struct sctp_paramhdr)) {
4200                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *)&pstore);
4201                 if (ph == NULL) {
4202                         /* TSNH */
4203                         break;
4204                 }
4205                 param_len = ntohs(ph->param_length);
4206                 if ((param_len > remaining_length) ||
4207                     (param_len < (sizeof(struct sctp_paramhdr) + sizeof(uint32_t)))) {
4208                         /* bad parameter length */
4209                         break;
4210                 }
4211                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, sizeof(cstore)),
4212                     (uint8_t *)&cstore);
4213                 if (ph == NULL) {
4214                         /* TSNH */
4215                         break;
4216                 }
4217                 ptype = ntohs(ph->param_type);
4218                 num_param++;
4219                 if (param_len > sizeof(cstore)) {
4220                         trunc = 1;
4221                 } else {
4222                         trunc = 0;
4223                 }
4224                 if (num_param > SCTP_MAX_RESET_PARAMS) {
4225                         /* hit the max of parameters already sorry.. */
4226                         break;
4227                 }
4228                 if (ptype == SCTP_STR_RESET_OUT_REQUEST) {
4229                         struct sctp_stream_reset_out_request *req_out;
4230
4231                         if (param_len < sizeof(struct sctp_stream_reset_out_request)) {
4232                                 break;
4233                         }
4234                         req_out = (struct sctp_stream_reset_out_request *)ph;
4235                         num_req++;
4236                         if (stcb->asoc.stream_reset_outstanding) {
4237                                 seq = ntohl(req_out->response_seq);
4238                                 if (seq == stcb->asoc.str_reset_seq_out) {
4239                                         /* implicit ack */
4240                                         (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL);
4241                                 }
4242                         }
4243                         sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc);
4244                 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) {
4245                         struct sctp_stream_reset_add_strm *str_add;
4246
4247                         if (param_len < sizeof(struct sctp_stream_reset_add_strm)) {
4248                                 break;
4249                         }
4250                         str_add = (struct sctp_stream_reset_add_strm *)ph;
4251                         num_req++;
4252                         sctp_handle_str_reset_add_strm(stcb, chk, str_add);
4253                 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) {
4254                         struct sctp_stream_reset_add_strm *str_add;
4255
4256                         if (param_len < sizeof(struct sctp_stream_reset_add_strm)) {
4257                                 break;
4258                         }
4259                         str_add = (struct sctp_stream_reset_add_strm *)ph;
4260                         num_req++;
4261                         sctp_handle_str_reset_add_out_strm(stcb, chk, str_add);
4262                 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) {
4263                         struct sctp_stream_reset_in_request *req_in;
4264
4265                         num_req++;
4266                         req_in = (struct sctp_stream_reset_in_request *)ph;
4267                         sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc);
4268                 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) {
4269                         struct sctp_stream_reset_tsn_request *req_tsn;
4270
4271                         num_req++;
4272                         req_tsn = (struct sctp_stream_reset_tsn_request *)ph;
4273                         if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) {
4274                                 ret_code = 1;
4275                                 goto strres_nochunk;
4276                         }
4277                         /* no more */
4278                         break;
4279                 } else if (ptype == SCTP_STR_RESET_RESPONSE) {
4280                         struct sctp_stream_reset_response *resp;
4281                         uint32_t result;
4282
4283                         if (param_len < sizeof(struct sctp_stream_reset_response)) {
4284                                 break;
4285                         }
4286                         resp = (struct sctp_stream_reset_response *)ph;
4287                         seq = ntohl(resp->response_seq);
4288                         result = ntohl(resp->result);
4289                         if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) {
4290                                 ret_code = 1;
4291                                 goto strres_nochunk;
4292                         }
4293                 } else {
4294                         break;
4295                 }
4296                 offset += SCTP_SIZE32(param_len);
4297                 if (remaining_length >= SCTP_SIZE32(param_len)) {
4298                         remaining_length -= SCTP_SIZE32(param_len);
4299                 } else {
4300                         remaining_length = 0;
4301                 }
4302         }
4303         if (num_req == 0) {
4304                 /* we have no response free the stuff */
4305                 goto strres_nochunk;
4306         }
4307         /* ok we have a chunk to link in */
4308         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue,
4309             chk,
4310             sctp_next);
4311         stcb->asoc.ctrl_queue_cnt++;
4312         return (ret_code);
4313 }
4314
4315 /*
4316  * Handle a router or endpoints report of a packet loss, there are two ways
4317  * to handle this, either we get the whole packet and must disect it
4318  * ourselves (possibly with truncation and or corruption) or it is a summary
4319  * from a middle box that did the disectting for us.
4320  */
4321 static void
4322 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp,
4323     struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit)
4324 {
4325         uint32_t bottle_bw, on_queue;
4326         uint16_t trunc_len;
4327         unsigned int chlen;
4328         unsigned int at;
4329         struct sctp_chunk_desc desc;
4330         struct sctp_chunkhdr *ch;
4331
4332         chlen = ntohs(cp->ch.chunk_length);
4333         chlen -= sizeof(struct sctp_pktdrop_chunk);
4334         /* XXX possible chlen underflow */
4335         if (chlen == 0) {
4336                 ch = NULL;
4337                 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)
4338                         SCTP_STAT_INCR(sctps_pdrpbwrpt);
4339         } else {
4340                 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr));
4341                 chlen -= sizeof(struct sctphdr);
4342                 /* XXX possible chlen underflow */
4343                 memset(&desc, 0, sizeof(desc));
4344         }
4345         trunc_len = (uint16_t)ntohs(cp->trunc_len);
4346         if (trunc_len > limit) {
4347                 trunc_len = limit;
4348         }
4349         /* now the chunks themselves */
4350         while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) {
4351                 desc.chunk_type = ch->chunk_type;
4352                 /* get amount we need to move */
4353                 at = ntohs(ch->chunk_length);
4354                 if (at < sizeof(struct sctp_chunkhdr)) {
4355                         /* corrupt chunk, maybe at the end? */
4356                         SCTP_STAT_INCR(sctps_pdrpcrupt);
4357                         break;
4358                 }
4359                 if (trunc_len == 0) {
4360                         /* we are supposed to have all of it */
4361                         if (at > chlen) {
4362                                 /* corrupt skip it */
4363                                 SCTP_STAT_INCR(sctps_pdrpcrupt);
4364                                 break;
4365                         }
4366                 } else {
4367                         /* is there enough of it left ? */
4368                         if (desc.chunk_type == SCTP_DATA) {
4369                                 if (chlen < (sizeof(struct sctp_data_chunk) +
4370                                     sizeof(desc.data_bytes))) {
4371                                         break;
4372                                 }
4373                         } else {
4374                                 if (chlen < sizeof(struct sctp_chunkhdr)) {
4375                                         break;
4376                                 }
4377                         }
4378                 }
4379                 if (desc.chunk_type == SCTP_DATA) {
4380                         /* can we get out the tsn? */
4381                         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
4382                                 SCTP_STAT_INCR(sctps_pdrpmbda);
4383
4384                         if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) {
4385                                 /* yep */
4386                                 struct sctp_data_chunk *dcp;
4387                                 uint8_t *ddp;
4388                                 unsigned int iii;
4389
4390                                 dcp = (struct sctp_data_chunk *)ch;
4391                                 ddp = (uint8_t *)(dcp + 1);
4392                                 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) {
4393                                         desc.data_bytes[iii] = ddp[iii];
4394                                 }
4395                                 desc.tsn_ifany = dcp->dp.tsn;
4396                         } else {
4397                                 /* nope we are done. */
4398                                 SCTP_STAT_INCR(sctps_pdrpnedat);
4399                                 break;
4400                         }
4401                 } else {
4402                         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
4403                                 SCTP_STAT_INCR(sctps_pdrpmbct);
4404                 }
4405
4406                 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) {
4407                         SCTP_STAT_INCR(sctps_pdrppdbrk);
4408                         break;
4409                 }
4410                 if (SCTP_SIZE32(at) > chlen) {
4411                         break;
4412                 }
4413                 chlen -= SCTP_SIZE32(at);
4414                 if (chlen < sizeof(struct sctp_chunkhdr)) {
4415                         /* done, none left */
4416                         break;
4417                 }
4418                 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at));
4419         }
4420         /* Now update any rwnd --- possibly */
4421         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) {
4422                 /* From a peer, we get a rwnd report */
4423                 uint32_t a_rwnd;
4424
4425                 SCTP_STAT_INCR(sctps_pdrpfehos);
4426
4427                 bottle_bw = ntohl(cp->bottle_bw);
4428                 on_queue = ntohl(cp->current_onq);
4429                 if (bottle_bw && on_queue) {
4430                         /* a rwnd report is in here */
4431                         if (bottle_bw > on_queue)
4432                                 a_rwnd = bottle_bw - on_queue;
4433                         else
4434                                 a_rwnd = 0;
4435
4436                         if (a_rwnd == 0)
4437                                 stcb->asoc.peers_rwnd = 0;
4438                         else {
4439                                 if (a_rwnd > stcb->asoc.total_flight) {
4440                                         stcb->asoc.peers_rwnd =
4441                                             a_rwnd - stcb->asoc.total_flight;
4442                                 } else {
4443                                         stcb->asoc.peers_rwnd = 0;
4444                                 }
4445                                 if (stcb->asoc.peers_rwnd <
4446                                     stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
4447                                         /* SWS sender side engages */
4448                                         stcb->asoc.peers_rwnd = 0;
4449                                 }
4450                         }
4451                 }
4452         } else {
4453                 SCTP_STAT_INCR(sctps_pdrpfmbox);
4454         }
4455
4456         /* now middle boxes in sat networks get a cwnd bump */
4457         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) &&
4458             (stcb->asoc.sat_t3_loss_recovery == 0) &&
4459             (stcb->asoc.sat_network)) {
4460                 /*
4461                  * This is debatable but for sat networks it makes sense
4462                  * Note if a T3 timer has went off, we will prohibit any
4463                  * changes to cwnd until we exit the t3 loss recovery.
4464                  */
4465                 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb,
4466                     net, cp, &bottle_bw, &on_queue);
4467         }
4468 }
4469
4470 /*
4471  * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to
4472  * still contain IP/SCTP header - stcb: is the tcb found for this packet -
4473  * offset: offset into the mbuf chain to first chunkhdr - length: is the
4474  * length of the complete packet outputs: - length: modified to remaining
4475  * length after control processing - netp: modified to new sctp_nets after
4476  * cookie-echo processing - return NULL to discard the packet (ie. no asoc,
4477  * bad packet,...) otherwise return the tcb for this packet
4478  */
4479 #ifdef __GNUC__
4480 __attribute__((noinline))
4481 #endif
4482 static struct sctp_tcb *
4483 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length,
4484     struct sockaddr *src, struct sockaddr *dst,
4485     struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp,
4486     struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen,
4487     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
4488     uint32_t vrf_id, uint16_t port)
4489 {
4490         struct sctp_association *asoc;
4491         struct mbuf *op_err;
4492         char msg[SCTP_DIAG_INFO_LEN];
4493         uint32_t vtag_in;
4494         int num_chunks = 0;     /* number of control chunks processed */
4495         uint32_t chk_length;
4496         int ret;
4497         int abort_no_unlock = 0;
4498         int ecne_seen = 0;
4499
4500         /*
4501          * How big should this be, and should it be alloc'd? Lets try the
4502          * d-mtu-ceiling for now (2k) and that should hopefully work ...
4503          * until we get into jumbo grams and such..
4504          */
4505         uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE];
4506         struct sctp_tcb *locked_tcb = stcb;
4507         int got_auth = 0;
4508         uint32_t auth_offset = 0, auth_len = 0;
4509         int auth_skipped = 0;
4510         int asconf_cnt = 0;
4511 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4512         struct socket *so;
4513 #endif
4514
4515         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n",
4516             iphlen, *offset, length, (void *)stcb);
4517
4518         /* validate chunk header length... */
4519         if (ntohs(ch->chunk_length) < sizeof(*ch)) {
4520                 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n",
4521                     ntohs(ch->chunk_length));
4522                 if (locked_tcb) {
4523                         SCTP_TCB_UNLOCK(locked_tcb);
4524                 }
4525                 return (NULL);
4526         }
4527         /*
4528          * validate the verification tag
4529          */
4530         vtag_in = ntohl(sh->v_tag);
4531
4532         if (locked_tcb) {
4533                 SCTP_TCB_LOCK_ASSERT(locked_tcb);
4534         }
4535         if (ch->chunk_type == SCTP_INITIATION) {
4536                 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n",
4537                     ntohs(ch->chunk_length), vtag_in);
4538                 if (vtag_in != 0) {
4539                         /* protocol error- silently discard... */
4540                         SCTP_STAT_INCR(sctps_badvtag);
4541                         if (locked_tcb) {
4542                                 SCTP_TCB_UNLOCK(locked_tcb);
4543                         }
4544                         return (NULL);
4545                 }
4546         } else if (ch->chunk_type != SCTP_COOKIE_ECHO) {
4547                 /*
4548                  * If there is no stcb, skip the AUTH chunk and process
4549                  * later after a stcb is found (to validate the lookup was
4550                  * valid.
4551                  */
4552                 if ((ch->chunk_type == SCTP_AUTHENTICATION) &&
4553                     (stcb == NULL) &&
4554                     (inp->auth_supported == 1)) {
4555                         /* save this chunk for later processing */
4556                         auth_skipped = 1;
4557                         auth_offset = *offset;
4558                         auth_len = ntohs(ch->chunk_length);
4559
4560                         /* (temporarily) move past this chunk */
4561                         *offset += SCTP_SIZE32(auth_len);
4562                         if (*offset >= length) {
4563                                 /* no more data left in the mbuf chain */
4564                                 *offset = length;
4565                                 if (locked_tcb) {
4566                                         SCTP_TCB_UNLOCK(locked_tcb);
4567                                 }
4568                                 return (NULL);
4569                         }
4570                         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4571                             sizeof(struct sctp_chunkhdr), chunk_buf);
4572                 }
4573                 if (ch == NULL) {
4574                         /* Help */
4575                         *offset = length;
4576                         if (locked_tcb) {
4577                                 SCTP_TCB_UNLOCK(locked_tcb);
4578                         }
4579                         return (NULL);
4580                 }
4581                 if (ch->chunk_type == SCTP_COOKIE_ECHO) {
4582                         goto process_control_chunks;
4583                 }
4584                 /*
4585                  * first check if it's an ASCONF with an unknown src addr we
4586                  * need to look inside to find the association
4587                  */
4588                 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) {
4589                         struct sctp_chunkhdr *asconf_ch = ch;
4590                         uint32_t asconf_offset = 0, asconf_len = 0;
4591
4592                         /* inp's refcount may be reduced */
4593                         SCTP_INP_INCR_REF(inp);
4594
4595                         asconf_offset = *offset;
4596                         do {
4597                                 asconf_len = ntohs(asconf_ch->chunk_length);
4598                                 if (asconf_len < sizeof(struct sctp_asconf_paramhdr))
4599                                         break;
4600                                 stcb = sctp_findassociation_ep_asconf(m,
4601                                     *offset,
4602                                     dst,
4603                                     sh, &inp, netp, vrf_id);
4604                                 if (stcb != NULL)
4605                                         break;
4606                                 asconf_offset += SCTP_SIZE32(asconf_len);
4607                                 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset,
4608                                     sizeof(struct sctp_chunkhdr), chunk_buf);
4609                         } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF);
4610                         if (stcb == NULL) {
4611                                 /*
4612                                  * reduce inp's refcount if not reduced in
4613                                  * sctp_findassociation_ep_asconf().
4614                                  */
4615                                 SCTP_INP_DECR_REF(inp);
4616                         } else {
4617                                 locked_tcb = stcb;
4618                         }
4619
4620                         /* now go back and verify any auth chunk to be sure */
4621                         if (auth_skipped && (stcb != NULL)) {
4622                                 struct sctp_auth_chunk *auth;
4623
4624                                 auth = (struct sctp_auth_chunk *)
4625                                     sctp_m_getptr(m, auth_offset,
4626                                     auth_len, chunk_buf);
4627                                 got_auth = 1;
4628                                 auth_skipped = 0;
4629                                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m,
4630                                     auth_offset)) {
4631                                         /* auth HMAC failed so dump it */
4632                                         *offset = length;
4633                                         if (locked_tcb) {
4634                                                 SCTP_TCB_UNLOCK(locked_tcb);
4635                                         }
4636                                         return (NULL);
4637                                 } else {
4638                                         /* remaining chunks are HMAC checked */
4639                                         stcb->asoc.authenticated = 1;
4640                                 }
4641                         }
4642                 }
4643                 if (stcb == NULL) {
4644                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
4645                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
4646                             msg);
4647                         /* no association, so it's out of the blue... */
4648                         sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, op_err,
4649                             mflowtype, mflowid, inp->fibnum,
4650                             vrf_id, port);
4651                         *offset = length;
4652                         if (locked_tcb) {
4653                                 SCTP_TCB_UNLOCK(locked_tcb);
4654                         }
4655                         return (NULL);
4656                 }
4657                 asoc = &stcb->asoc;
4658                 /* ABORT and SHUTDOWN can use either v_tag... */
4659                 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) ||
4660                     (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) ||
4661                     (ch->chunk_type == SCTP_PACKET_DROPPED)) {
4662                         /* Take the T-bit always into account. */
4663                         if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) &&
4664                             (vtag_in == asoc->my_vtag)) ||
4665                             (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) &&
4666                             (vtag_in == asoc->peer_vtag))) {
4667                                 /* this is valid */
4668                         } else {
4669                                 /* drop this packet... */
4670                                 SCTP_STAT_INCR(sctps_badvtag);
4671                                 if (locked_tcb) {
4672                                         SCTP_TCB_UNLOCK(locked_tcb);
4673                                 }
4674                                 return (NULL);
4675                         }
4676                 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
4677                         if (vtag_in != asoc->my_vtag) {
4678                                 /*
4679                                  * this could be a stale SHUTDOWN-ACK or the
4680                                  * peer never got the SHUTDOWN-COMPLETE and
4681                                  * is still hung; we have started a new asoc
4682                                  * but it won't complete until the shutdown
4683                                  * is completed
4684                                  */
4685                                 if (locked_tcb) {
4686                                         SCTP_TCB_UNLOCK(locked_tcb);
4687                                 }
4688                                 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
4689                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
4690                                     msg);
4691                                 sctp_handle_ootb(m, iphlen, *offset, src, dst,
4692                                     sh, inp, op_err,
4693                                     mflowtype, mflowid, fibnum,
4694                                     vrf_id, port);
4695                                 return (NULL);
4696                         }
4697                 } else {
4698                         /* for all other chunks, vtag must match */
4699                         if (vtag_in != asoc->my_vtag) {
4700                                 /* invalid vtag... */
4701                                 SCTPDBG(SCTP_DEBUG_INPUT3,
4702                                     "invalid vtag: %xh, expect %xh\n",
4703                                     vtag_in, asoc->my_vtag);
4704                                 SCTP_STAT_INCR(sctps_badvtag);
4705                                 if (locked_tcb) {
4706                                         SCTP_TCB_UNLOCK(locked_tcb);
4707                                 }
4708                                 *offset = length;
4709                                 return (NULL);
4710                         }
4711                 }
4712         }                       /* end if !SCTP_COOKIE_ECHO */
4713         /*
4714          * process all control chunks...
4715          */
4716         if (((ch->chunk_type == SCTP_SELECTIVE_ACK) ||
4717             (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) ||
4718             (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) &&
4719             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) {
4720                 /* implied cookie-ack.. we must have lost the ack */
4721                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
4722                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
4723                             stcb->asoc.overall_error_count,
4724                             0,
4725                             SCTP_FROM_SCTP_INPUT,
4726                             __LINE__);
4727                 }
4728                 stcb->asoc.overall_error_count = 0;
4729                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb,
4730                     *netp);
4731         }
4732 process_control_chunks:
4733         while (IS_SCTP_CONTROL(ch)) {
4734                 /* validate chunk length */
4735                 chk_length = ntohs(ch->chunk_length);
4736                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n",
4737                     ch->chunk_type, chk_length);
4738                 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length);
4739                 if (chk_length < sizeof(*ch) ||
4740                     (*offset + (int)chk_length) > length) {
4741                         *offset = length;
4742                         if (locked_tcb) {
4743                                 SCTP_TCB_UNLOCK(locked_tcb);
4744                         }
4745                         return (NULL);
4746                 }
4747                 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks);
4748                 /*
4749                  * INIT-ACK only gets the init ack "header" portion only
4750                  * because we don't have to process the peer's COOKIE. All
4751                  * others get a complete chunk.
4752                  */
4753                 if ((ch->chunk_type == SCTP_INITIATION_ACK) ||
4754                     (ch->chunk_type == SCTP_INITIATION)) {
4755                         /* get an init-ack chunk */
4756                         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4757                             sizeof(struct sctp_init_ack_chunk), chunk_buf);
4758                         if (ch == NULL) {
4759                                 *offset = length;
4760                                 if (locked_tcb) {
4761                                         SCTP_TCB_UNLOCK(locked_tcb);
4762                                 }
4763                                 return (NULL);
4764                         }
4765                 } else {
4766                         /* For cookies and all other chunks. */
4767                         if (chk_length > sizeof(chunk_buf)) {
4768                                 /*
4769                                  * use just the size of the chunk buffer so
4770                                  * the front part of our chunks fit in
4771                                  * contiguous space up to the chunk buffer
4772                                  * size (508 bytes). For chunks that need to
4773                                  * get more than that they must use the
4774                                  * sctp_m_getptr() function or other means
4775                                  * (e.g. know how to parse mbuf chains).
4776                                  * Cookies do this already.
4777                                  */
4778                                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4779                                     (sizeof(chunk_buf) - 4),
4780                                     chunk_buf);
4781                                 if (ch == NULL) {
4782                                         *offset = length;
4783                                         if (locked_tcb) {
4784                                                 SCTP_TCB_UNLOCK(locked_tcb);
4785                                         }
4786                                         return (NULL);
4787                                 }
4788                         } else {
4789                                 /* We can fit it all */
4790                                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4791                                     chk_length, chunk_buf);
4792                                 if (ch == NULL) {
4793                                         SCTP_PRINTF("sctp_process_control: Can't get the all data....\n");
4794                                         *offset = length;
4795                                         if (locked_tcb) {
4796                                                 SCTP_TCB_UNLOCK(locked_tcb);
4797                                         }
4798                                         return (NULL);
4799                                 }
4800                         }
4801                 }
4802                 num_chunks++;
4803                 /* Save off the last place we got a control from */
4804                 if (stcb != NULL) {
4805                         if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) {
4806                                 /*
4807                                  * allow last_control to be NULL if
4808                                  * ASCONF... ASCONF processing will find the
4809                                  * right net later
4810                                  */
4811                                 if ((netp != NULL) && (*netp != NULL))
4812                                         stcb->asoc.last_control_chunk_from = *netp;
4813                         }
4814                 }
4815 #ifdef SCTP_AUDITING_ENABLED
4816                 sctp_audit_log(0xB0, ch->chunk_type);
4817 #endif
4818
4819                 /* check to see if this chunk required auth, but isn't */
4820                 if ((stcb != NULL) &&
4821                     (stcb->asoc.auth_supported == 1) &&
4822                     sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) &&
4823                     !stcb->asoc.authenticated) {
4824                         /* "silently" ignore */
4825                         SCTP_STAT_INCR(sctps_recvauthmissing);
4826                         goto next_chunk;
4827                 }
4828                 switch (ch->chunk_type) {
4829                 case SCTP_INITIATION:
4830                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n");
4831                         /* The INIT chunk must be the only chunk. */
4832                         if ((num_chunks > 1) ||
4833                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4834                                 /* RFC 4960 requires that no ABORT is sent */
4835                                 *offset = length;
4836                                 if (locked_tcb) {
4837                                         SCTP_TCB_UNLOCK(locked_tcb);
4838                                 }
4839                                 return (NULL);
4840                         }
4841                         /* Honor our resource limit. */
4842                         if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) {
4843                                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
4844                                 sctp_abort_association(inp, stcb, m, iphlen,
4845                                     src, dst, sh, op_err,
4846                                     mflowtype, mflowid,
4847                                     vrf_id, port);
4848                                 *offset = length;
4849                                 return (NULL);
4850                         }
4851                         sctp_handle_init(m, iphlen, *offset, src, dst, sh,
4852                             (struct sctp_init_chunk *)ch, inp,
4853                             stcb, *netp, &abort_no_unlock,
4854                             mflowtype, mflowid,
4855                             vrf_id, port);
4856                         *offset = length;
4857                         if ((!abort_no_unlock) && (locked_tcb)) {
4858                                 SCTP_TCB_UNLOCK(locked_tcb);
4859                         }
4860                         return (NULL);
4861                         break;
4862                 case SCTP_PAD_CHUNK:
4863                         break;
4864                 case SCTP_INITIATION_ACK:
4865                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT-ACK\n");
4866                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4867                                 /* We are not interested anymore */
4868                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
4869                                         ;
4870                                 } else {
4871                                         if ((locked_tcb != NULL) && (locked_tcb != stcb)) {
4872                                                 /* Very unlikely */
4873                                                 SCTP_TCB_UNLOCK(locked_tcb);
4874                                         }
4875                                         *offset = length;
4876                                         if (stcb) {
4877 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4878                                                 so = SCTP_INP_SO(inp);
4879                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4880                                                 SCTP_TCB_UNLOCK(stcb);
4881                                                 SCTP_SOCKET_LOCK(so, 1);
4882                                                 SCTP_TCB_LOCK(stcb);
4883                                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4884 #endif
4885                                                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
4886                                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_29);
4887 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4888                                                 SCTP_SOCKET_UNLOCK(so, 1);
4889 #endif
4890                                         }
4891                                         return (NULL);
4892                                 }
4893                         }
4894                         /* The INIT-ACK chunk must be the only chunk. */
4895                         if ((num_chunks > 1) ||
4896                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4897                                 *offset = length;
4898                                 if (locked_tcb) {
4899                                         SCTP_TCB_UNLOCK(locked_tcb);
4900                                 }
4901                                 return (NULL);
4902                         }
4903                         if ((netp) && (*netp)) {
4904                                 ret = sctp_handle_init_ack(m, iphlen, *offset,
4905                                     src, dst, sh,
4906                                     (struct sctp_init_ack_chunk *)ch,
4907                                     stcb, *netp,
4908                                     &abort_no_unlock,
4909                                     mflowtype, mflowid,
4910                                     vrf_id);
4911                         } else {
4912                                 ret = -1;
4913                         }
4914                         *offset = length;
4915                         if (abort_no_unlock) {
4916                                 return (NULL);
4917                         }
4918                         /*
4919                          * Special case, I must call the output routine to
4920                          * get the cookie echoed
4921                          */
4922                         if ((stcb != NULL) && (ret == 0)) {
4923                                 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
4924                         }
4925                         if (locked_tcb) {
4926                                 SCTP_TCB_UNLOCK(locked_tcb);
4927                         }
4928                         return (NULL);
4929                         break;
4930                 case SCTP_SELECTIVE_ACK:
4931                         {
4932                                 struct sctp_sack_chunk *sack;
4933                                 int abort_now = 0;
4934                                 uint32_t a_rwnd, cum_ack;
4935                                 uint16_t num_seg, num_dup;
4936                                 uint8_t flags;
4937                                 int offset_seg, offset_dup;
4938
4939                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK\n");
4940                                 SCTP_STAT_INCR(sctps_recvsacks);
4941                                 if (stcb == NULL) {
4942                                         SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing SACK chunk\n");
4943                                         break;
4944                                 }
4945                                 if (chk_length < sizeof(struct sctp_sack_chunk)) {
4946                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n");
4947                                         break;
4948                                 }
4949                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
4950                                         /*-
4951                                          * If we have sent a shutdown-ack, we will pay no
4952                                          * attention to a sack sent in to us since
4953                                          * we don't care anymore.
4954                                          */
4955                                         break;
4956                                 }
4957                                 sack = (struct sctp_sack_chunk *)ch;
4958                                 flags = ch->chunk_flags;
4959                                 cum_ack = ntohl(sack->sack.cum_tsn_ack);
4960                                 num_seg = ntohs(sack->sack.num_gap_ack_blks);
4961                                 num_dup = ntohs(sack->sack.num_dup_tsns);
4962                                 a_rwnd = (uint32_t)ntohl(sack->sack.a_rwnd);
4963                                 if (sizeof(struct sctp_sack_chunk) +
4964                                     num_seg * sizeof(struct sctp_gap_ack_block) +
4965                                     num_dup * sizeof(uint32_t) != chk_length) {
4966                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n");
4967                                         break;
4968                                 }
4969                                 offset_seg = *offset + sizeof(struct sctp_sack_chunk);
4970                                 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
4971                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n",
4972                                     cum_ack, num_seg, a_rwnd);
4973                                 stcb->asoc.seen_a_sack_this_pkt = 1;
4974                                 if ((stcb->asoc.pr_sctp_cnt == 0) &&
4975                                     (num_seg == 0) &&
4976                                     SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
4977                                     (stcb->asoc.saw_sack_with_frags == 0) &&
4978                                     (stcb->asoc.saw_sack_with_nr_frags == 0) &&
4979                                     (!TAILQ_EMPTY(&stcb->asoc.sent_queue))
4980                                     ) {
4981                                         /*
4982                                          * We have a SIMPLE sack having no
4983                                          * prior segments and data on sent
4984                                          * queue to be acked.. Use the
4985                                          * faster path sack processing. We
4986                                          * also allow window update sacks
4987                                          * with no missing segments to go
4988                                          * this way too.
4989                                          */
4990                                         sctp_express_handle_sack(stcb, cum_ack, a_rwnd, &abort_now, ecne_seen);
4991                                 } else {
4992                                         if (netp && *netp)
4993                                                 sctp_handle_sack(m, offset_seg, offset_dup, stcb,
4994                                                     num_seg, 0, num_dup, &abort_now, flags,
4995                                                     cum_ack, a_rwnd, ecne_seen);
4996                                 }
4997                                 if (abort_now) {
4998                                         /* ABORT signal from sack processing */
4999                                         *offset = length;
5000                                         return (NULL);
5001                                 }
5002                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
5003                                     TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
5004                                     (stcb->asoc.stream_queue_cnt == 0)) {
5005                                         sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
5006                                 }
5007                         }
5008                         break;
5009                         /*
5010                          * EY - nr_sack:  If the received chunk is an
5011                          * nr_sack chunk
5012                          */
5013                 case SCTP_NR_SELECTIVE_ACK:
5014                         {
5015                                 struct sctp_nr_sack_chunk *nr_sack;
5016                                 int abort_now = 0;
5017                                 uint32_t a_rwnd, cum_ack;
5018                                 uint16_t num_seg, num_nr_seg, num_dup;
5019                                 uint8_t flags;
5020                                 int offset_seg, offset_dup;
5021
5022                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK\n");
5023                                 SCTP_STAT_INCR(sctps_recvsacks);
5024                                 if (stcb == NULL) {
5025                                         SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing NR-SACK chunk\n");
5026                                         break;
5027                                 }
5028                                 if (stcb->asoc.nrsack_supported == 0) {
5029                                         goto unknown_chunk;
5030                                 }
5031                                 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) {
5032                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR-SACK chunk, too small\n");
5033                                         break;
5034                                 }
5035                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
5036                                         /*-
5037                                          * If we have sent a shutdown-ack, we will pay no
5038                                          * attention to a sack sent in to us since
5039                                          * we don't care anymore.
5040                                          */
5041                                         break;
5042                                 }
5043                                 nr_sack = (struct sctp_nr_sack_chunk *)ch;
5044                                 flags = ch->chunk_flags;
5045                                 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack);
5046                                 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks);
5047                                 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks);
5048                                 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns);
5049                                 a_rwnd = (uint32_t)ntohl(nr_sack->nr_sack.a_rwnd);
5050                                 if (sizeof(struct sctp_nr_sack_chunk) +
5051                                     (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) +
5052                                     num_dup * sizeof(uint32_t) != chk_length) {
5053                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n");
5054                                         break;
5055                                 }
5056                                 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk);
5057                                 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
5058                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n",
5059                                     cum_ack, num_seg, a_rwnd);
5060                                 stcb->asoc.seen_a_sack_this_pkt = 1;
5061                                 if ((stcb->asoc.pr_sctp_cnt == 0) &&
5062                                     (num_seg == 0) && (num_nr_seg == 0) &&
5063                                     SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
5064                                     (stcb->asoc.saw_sack_with_frags == 0) &&
5065                                     (stcb->asoc.saw_sack_with_nr_frags == 0) &&
5066                                     (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
5067                                         /*
5068                                          * We have a SIMPLE sack having no
5069                                          * prior segments and data on sent
5070                                          * queue to be acked. Use the faster
5071                                          * path sack processing. We also
5072                                          * allow window update sacks with no
5073                                          * missing segments to go this way
5074                                          * too.
5075                                          */
5076                                         sctp_express_handle_sack(stcb, cum_ack, a_rwnd,
5077                                             &abort_now, ecne_seen);
5078                                 } else {
5079                                         if (netp && *netp)
5080                                                 sctp_handle_sack(m, offset_seg, offset_dup, stcb,
5081                                                     num_seg, num_nr_seg, num_dup, &abort_now, flags,
5082                                                     cum_ack, a_rwnd, ecne_seen);
5083                                 }
5084                                 if (abort_now) {
5085                                         /* ABORT signal from sack processing */
5086                                         *offset = length;
5087                                         return (NULL);
5088                                 }
5089                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
5090                                     TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
5091                                     (stcb->asoc.stream_queue_cnt == 0)) {
5092                                         sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
5093                                 }
5094                         }
5095                         break;
5096
5097                 case SCTP_HEARTBEAT_REQUEST:
5098                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n");
5099                         if ((stcb) && netp && *netp) {
5100                                 SCTP_STAT_INCR(sctps_recvheartbeat);
5101                                 sctp_send_heartbeat_ack(stcb, m, *offset,
5102                                     chk_length, *netp);
5103
5104                                 /* He's alive so give him credit */
5105                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5106                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5107                                             stcb->asoc.overall_error_count,
5108                                             0,
5109                                             SCTP_FROM_SCTP_INPUT,
5110                                             __LINE__);
5111                                 }
5112                                 stcb->asoc.overall_error_count = 0;
5113                         }
5114                         break;
5115                 case SCTP_HEARTBEAT_ACK:
5116                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT-ACK\n");
5117                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) {
5118                                 /* Its not ours */
5119                                 *offset = length;
5120                                 if (locked_tcb) {
5121                                         SCTP_TCB_UNLOCK(locked_tcb);
5122                                 }
5123                                 return (NULL);
5124                         }
5125                         /* He's alive so give him credit */
5126                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5127                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5128                                     stcb->asoc.overall_error_count,
5129                                     0,
5130                                     SCTP_FROM_SCTP_INPUT,
5131                                     __LINE__);
5132                         }
5133                         stcb->asoc.overall_error_count = 0;
5134                         SCTP_STAT_INCR(sctps_recvheartbeatack);
5135                         if (netp && *netp)
5136                                 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch,
5137                                     stcb, *netp);
5138                         break;
5139                 case SCTP_ABORT_ASSOCIATION:
5140                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n",
5141                             (void *)stcb);
5142                         if ((stcb) && netp && *netp)
5143                                 sctp_handle_abort((struct sctp_abort_chunk *)ch,
5144                                     stcb, *netp);
5145                         *offset = length;
5146                         return (NULL);
5147                         break;
5148                 case SCTP_SHUTDOWN:
5149                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n",
5150                             (void *)stcb);
5151                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) {
5152                                 *offset = length;
5153                                 if (locked_tcb) {
5154                                         SCTP_TCB_UNLOCK(locked_tcb);
5155                                 }
5156                                 return (NULL);
5157                         }
5158                         if (netp && *netp) {
5159                                 int abort_flag = 0;
5160
5161                                 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch,
5162                                     stcb, *netp, &abort_flag);
5163                                 if (abort_flag) {
5164                                         *offset = length;
5165                                         return (NULL);
5166                                 }
5167                         }
5168                         break;
5169                 case SCTP_SHUTDOWN_ACK:
5170                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-ACK, stcb %p\n", (void *)stcb);
5171                         if ((stcb) && (netp) && (*netp))
5172                                 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp);
5173                         *offset = length;
5174                         return (NULL);
5175                         break;
5176
5177                 case SCTP_OPERATION_ERROR:
5178                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP-ERR\n");
5179                         if ((stcb) && netp && *netp && sctp_handle_error(ch, stcb, *netp) < 0) {
5180                                 *offset = length;
5181                                 return (NULL);
5182                         }
5183                         break;
5184                 case SCTP_COOKIE_ECHO:
5185                         SCTPDBG(SCTP_DEBUG_INPUT3,
5186                             "SCTP_COOKIE-ECHO, stcb %p\n", (void *)stcb);
5187                         if ((stcb) && (stcb->asoc.total_output_queue_size)) {
5188                                 ;
5189                         } else {
5190                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5191                                         /* We are not interested anymore */
5192                         abend:
5193                                         if (stcb) {
5194                                                 SCTP_TCB_UNLOCK(stcb);
5195                                         }
5196                                         *offset = length;
5197                                         return (NULL);
5198                                 }
5199                         }
5200                         /*
5201                          * First are we accepting? We do this again here
5202                          * since it is possible that a previous endpoint WAS
5203                          * listening responded to a INIT-ACK and then
5204                          * closed. We opened and bound.. and are now no
5205                          * longer listening.
5206                          */
5207
5208                         if ((stcb == NULL) && (inp->sctp_socket->so_qlen >= inp->sctp_socket->so_qlimit)) {
5209                                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
5210                                     (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) {
5211                                         op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
5212                                         sctp_abort_association(inp, stcb, m, iphlen,
5213                                             src, dst, sh, op_err,
5214                                             mflowtype, mflowid,
5215                                             vrf_id, port);
5216                                 }
5217                                 *offset = length;
5218                                 return (NULL);
5219                         } else {
5220                                 struct mbuf *ret_buf;
5221                                 struct sctp_inpcb *linp;
5222
5223                                 if (stcb) {
5224                                         linp = NULL;
5225                                 } else {
5226                                         linp = inp;
5227                                 }
5228
5229                                 if (linp) {
5230                                         SCTP_ASOC_CREATE_LOCK(linp);
5231                                         if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
5232                                             (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
5233                                                 SCTP_ASOC_CREATE_UNLOCK(linp);
5234                                                 goto abend;
5235                                         }
5236                                 }
5237                                 if (netp) {
5238                                         ret_buf =
5239                                             sctp_handle_cookie_echo(m, iphlen,
5240                                             *offset,
5241                                             src, dst,
5242                                             sh,
5243                                             (struct sctp_cookie_echo_chunk *)ch,
5244                                             &inp, &stcb, netp,
5245                                             auth_skipped,
5246                                             auth_offset,
5247                                             auth_len,
5248                                             &locked_tcb,
5249                                             mflowtype,
5250                                             mflowid,
5251                                             vrf_id,
5252                                             port);
5253                                 } else {
5254                                         ret_buf = NULL;
5255                                 }
5256                                 if (linp) {
5257                                         SCTP_ASOC_CREATE_UNLOCK(linp);
5258                                 }
5259                                 if (ret_buf == NULL) {
5260                                         if (locked_tcb) {
5261                                                 SCTP_TCB_UNLOCK(locked_tcb);
5262                                         }
5263                                         SCTPDBG(SCTP_DEBUG_INPUT3,
5264                                             "GAK, null buffer\n");
5265                                         *offset = length;
5266                                         return (NULL);
5267                                 }
5268                                 /* if AUTH skipped, see if it verified... */
5269                                 if (auth_skipped) {
5270                                         got_auth = 1;
5271                                         auth_skipped = 0;
5272                                 }
5273                                 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) {
5274                                         /*
5275                                          * Restart the timer if we have
5276                                          * pending data
5277                                          */
5278                                         struct sctp_tmit_chunk *chk;
5279
5280                                         chk = TAILQ_FIRST(&stcb->asoc.sent_queue);
5281                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
5282                                 }
5283                         }
5284                         break;
5285                 case SCTP_COOKIE_ACK:
5286                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE-ACK, stcb %p\n", (void *)stcb);
5287                         if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) {
5288                                 if (locked_tcb) {
5289                                         SCTP_TCB_UNLOCK(locked_tcb);
5290                                 }
5291                                 return (NULL);
5292                         }
5293                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5294                                 /* We are not interested anymore */
5295                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
5296                                         ;
5297                                 } else if (stcb) {
5298 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5299                                         so = SCTP_INP_SO(inp);
5300                                         atomic_add_int(&stcb->asoc.refcnt, 1);
5301                                         SCTP_TCB_UNLOCK(stcb);
5302                                         SCTP_SOCKET_LOCK(so, 1);
5303                                         SCTP_TCB_LOCK(stcb);
5304                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
5305 #endif
5306                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
5307                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_30);
5308 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5309                                         SCTP_SOCKET_UNLOCK(so, 1);
5310 #endif
5311                                         *offset = length;
5312                                         return (NULL);
5313                                 }
5314                         }
5315                         /* He's alive so give him credit */
5316                         if ((stcb) && netp && *netp) {
5317                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5318                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5319                                             stcb->asoc.overall_error_count,
5320                                             0,
5321                                             SCTP_FROM_SCTP_INPUT,
5322                                             __LINE__);
5323                                 }
5324                                 stcb->asoc.overall_error_count = 0;
5325                                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp);
5326                         }
5327                         break;
5328                 case SCTP_ECN_ECHO:
5329                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-ECHO\n");
5330                         /* He's alive so give him credit */
5331                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) {
5332                                 /* Its not ours */
5333                                 if (locked_tcb) {
5334                                         SCTP_TCB_UNLOCK(locked_tcb);
5335                                 }
5336                                 *offset = length;
5337                                 return (NULL);
5338                         }
5339                         if (stcb) {
5340                                 if (stcb->asoc.ecn_supported == 0) {
5341                                         goto unknown_chunk;
5342                                 }
5343                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5344                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5345                                             stcb->asoc.overall_error_count,
5346                                             0,
5347                                             SCTP_FROM_SCTP_INPUT,
5348                                             __LINE__);
5349                                 }
5350                                 stcb->asoc.overall_error_count = 0;
5351                                 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch,
5352                                     stcb);
5353                                 ecne_seen = 1;
5354                         }
5355                         break;
5356                 case SCTP_ECN_CWR:
5357                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-CWR\n");
5358                         /* He's alive so give him credit */
5359                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) {
5360                                 /* Its not ours */
5361                                 if (locked_tcb) {
5362                                         SCTP_TCB_UNLOCK(locked_tcb);
5363                                 }
5364                                 *offset = length;
5365                                 return (NULL);
5366                         }
5367                         if (stcb) {
5368                                 if (stcb->asoc.ecn_supported == 0) {
5369                                         goto unknown_chunk;
5370                                 }
5371                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5372                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5373                                             stcb->asoc.overall_error_count,
5374                                             0,
5375                                             SCTP_FROM_SCTP_INPUT,
5376                                             __LINE__);
5377                                 }
5378                                 stcb->asoc.overall_error_count = 0;
5379                                 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp);
5380                         }
5381                         break;
5382                 case SCTP_SHUTDOWN_COMPLETE:
5383                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-COMPLETE, stcb %p\n", (void *)stcb);
5384                         /* must be first and only chunk */
5385                         if ((num_chunks > 1) ||
5386                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
5387                                 *offset = length;
5388                                 if (locked_tcb) {
5389                                         SCTP_TCB_UNLOCK(locked_tcb);
5390                                 }
5391                                 return (NULL);
5392                         }
5393                         if ((stcb) && netp && *netp) {
5394                                 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch,
5395                                     stcb, *netp);
5396                         }
5397                         *offset = length;
5398                         return (NULL);
5399                         break;
5400                 case SCTP_ASCONF:
5401                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n");
5402                         /* He's alive so give him credit */
5403                         if (stcb) {
5404                                 if (stcb->asoc.asconf_supported == 0) {
5405                                         goto unknown_chunk;
5406                                 }
5407                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5408                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5409                                             stcb->asoc.overall_error_count,
5410                                             0,
5411                                             SCTP_FROM_SCTP_INPUT,
5412                                             __LINE__);
5413                                 }
5414                                 stcb->asoc.overall_error_count = 0;
5415                                 sctp_handle_asconf(m, *offset, src,
5416                                     (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0);
5417                                 asconf_cnt++;
5418                         }
5419                         break;
5420                 case SCTP_ASCONF_ACK:
5421                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF-ACK\n");
5422                         if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) {
5423                                 /* Its not ours */
5424                                 if (locked_tcb) {
5425                                         SCTP_TCB_UNLOCK(locked_tcb);
5426                                 }
5427                                 *offset = length;
5428                                 return (NULL);
5429                         }
5430                         if ((stcb) && netp && *netp) {
5431                                 if (stcb->asoc.asconf_supported == 0) {
5432                                         goto unknown_chunk;
5433                                 }
5434                                 /* He's alive so give him credit */
5435                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5436                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5437                                             stcb->asoc.overall_error_count,
5438                                             0,
5439                                             SCTP_FROM_SCTP_INPUT,
5440                                             __LINE__);
5441                                 }
5442                                 stcb->asoc.overall_error_count = 0;
5443                                 sctp_handle_asconf_ack(m, *offset,
5444                                     (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock);
5445                                 if (abort_no_unlock)
5446                                         return (NULL);
5447                         }
5448                         break;
5449                 case SCTP_FORWARD_CUM_TSN:
5450                 case SCTP_IFORWARD_CUM_TSN:
5451                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD-TSN\n");
5452                         if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) {
5453                                 /* Its not ours */
5454                                 if (locked_tcb) {
5455                                         SCTP_TCB_UNLOCK(locked_tcb);
5456                                 }
5457                                 *offset = length;
5458                                 return (NULL);
5459                         }
5460                         /* He's alive so give him credit */
5461                         if (stcb) {
5462                                 int abort_flag = 0;
5463
5464                                 if (stcb->asoc.prsctp_supported == 0) {
5465                                         goto unknown_chunk;
5466                                 }
5467                                 stcb->asoc.overall_error_count = 0;
5468                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5469                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5470                                             stcb->asoc.overall_error_count,
5471                                             0,
5472                                             SCTP_FROM_SCTP_INPUT,
5473                                             __LINE__);
5474                                 }
5475                                 *fwd_tsn_seen = 1;
5476                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5477                                         /* We are not interested anymore */
5478 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5479                                         so = SCTP_INP_SO(inp);
5480                                         atomic_add_int(&stcb->asoc.refcnt, 1);
5481                                         SCTP_TCB_UNLOCK(stcb);
5482                                         SCTP_SOCKET_LOCK(so, 1);
5483                                         SCTP_TCB_LOCK(stcb);
5484                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
5485 #endif
5486                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
5487                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_31);
5488 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5489                                         SCTP_SOCKET_UNLOCK(so, 1);
5490 #endif
5491                                         *offset = length;
5492                                         return (NULL);
5493                                 }
5494                                 /*
5495                                  * For sending a SACK this looks like DATA
5496                                  * chunks.
5497                                  */
5498                                 stcb->asoc.last_data_chunk_from = stcb->asoc.last_control_chunk_from;
5499                                 sctp_handle_forward_tsn(stcb,
5500                                     (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset);
5501                                 if (abort_flag) {
5502                                         *offset = length;
5503                                         return (NULL);
5504                                 } else {
5505                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5506                                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5507                                                     stcb->asoc.overall_error_count,
5508                                                     0,
5509                                                     SCTP_FROM_SCTP_INPUT,
5510                                                     __LINE__);
5511                                         }
5512                                         stcb->asoc.overall_error_count = 0;
5513                                 }
5514
5515                         }
5516                         break;
5517                 case SCTP_STREAM_RESET:
5518                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n");
5519                         if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) {
5520                                 /* Its not ours */
5521                                 if (locked_tcb) {
5522                                         SCTP_TCB_UNLOCK(locked_tcb);
5523                                 }
5524                                 *offset = length;
5525                                 return (NULL);
5526                         }
5527                         if (stcb->asoc.reconfig_supported == 0) {
5528                                 goto unknown_chunk;
5529                         }
5530                         if (sctp_handle_stream_reset(stcb, m, *offset, ch)) {
5531                                 /* stop processing */
5532                                 *offset = length;
5533                                 return (NULL);
5534                         }
5535                         break;
5536                 case SCTP_PACKET_DROPPED:
5537                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n");
5538                         /* re-get it all please */
5539                         if (chk_length < sizeof(struct sctp_pktdrop_chunk)) {
5540                                 /* Its not ours */
5541                                 if (locked_tcb) {
5542                                         SCTP_TCB_UNLOCK(locked_tcb);
5543                                 }
5544                                 *offset = length;
5545                                 return (NULL);
5546                         }
5547                         if (ch && (stcb) && netp && (*netp)) {
5548                                 if (stcb->asoc.pktdrop_supported == 0) {
5549                                         goto unknown_chunk;
5550                                 }
5551                                 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch,
5552                                     stcb, *netp,
5553                                     min(chk_length, (sizeof(chunk_buf) - 4)));
5554
5555                         }
5556                         break;
5557                 case SCTP_AUTHENTICATION:
5558                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n");
5559                         if (stcb == NULL) {
5560                                 /* save the first AUTH for later processing */
5561                                 if (auth_skipped == 0) {
5562                                         auth_offset = *offset;
5563                                         auth_len = chk_length;
5564                                         auth_skipped = 1;
5565                                 }
5566                                 /* skip this chunk (temporarily) */
5567                                 goto next_chunk;
5568                         }
5569                         if (stcb->asoc.auth_supported == 0) {
5570                                 goto unknown_chunk;
5571                         }
5572                         if ((chk_length < (sizeof(struct sctp_auth_chunk))) ||
5573                             (chk_length > (sizeof(struct sctp_auth_chunk) +
5574                             SCTP_AUTH_DIGEST_LEN_MAX))) {
5575                                 /* Its not ours */
5576                                 if (locked_tcb) {
5577                                         SCTP_TCB_UNLOCK(locked_tcb);
5578                                 }
5579                                 *offset = length;
5580                                 return (NULL);
5581                         }
5582                         if (got_auth == 1) {
5583                                 /* skip this chunk... it's already auth'd */
5584                                 goto next_chunk;
5585                         }
5586                         got_auth = 1;
5587                         if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch,
5588                             m, *offset)) {
5589                                 /* auth HMAC failed so dump the packet */
5590                                 *offset = length;
5591                                 return (stcb);
5592                         } else {
5593                                 /* remaining chunks are HMAC checked */
5594                                 stcb->asoc.authenticated = 1;
5595                         }
5596                         break;
5597
5598                 default:
5599         unknown_chunk:
5600                         /* it's an unknown chunk! */
5601                         if ((ch->chunk_type & 0x40) && (stcb != NULL)) {
5602                                 struct sctp_gen_error_cause *cause;
5603                                 int len;
5604
5605                                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_gen_error_cause),
5606                                     0, M_NOWAIT, 1, MT_DATA);
5607                                 if (op_err != NULL) {
5608                                         len = min(SCTP_SIZE32(chk_length), (uint32_t)(length - *offset));
5609                                         cause = mtod(op_err, struct sctp_gen_error_cause *);
5610                                         cause->code = htons(SCTP_CAUSE_UNRECOG_CHUNK);
5611                                         cause->length = htons((uint16_t)(len + sizeof(struct sctp_gen_error_cause)));
5612                                         SCTP_BUF_LEN(op_err) = sizeof(struct sctp_gen_error_cause);
5613                                         SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(m, *offset, len, M_NOWAIT);
5614                                         if (SCTP_BUF_NEXT(op_err) != NULL) {
5615 #ifdef SCTP_MBUF_LOGGING
5616                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5617                                                         sctp_log_mbc(SCTP_BUF_NEXT(op_err), SCTP_MBUF_ICOPY);
5618                                                 }
5619 #endif
5620                                                 sctp_queue_op_err(stcb, op_err);
5621                                         } else {
5622                                                 sctp_m_freem(op_err);
5623                                         }
5624                                 }
5625                         }
5626                         if ((ch->chunk_type & 0x80) == 0) {
5627                                 /* discard this packet */
5628                                 *offset = length;
5629                                 return (stcb);
5630                         }       /* else skip this bad chunk and continue... */
5631                         break;
5632                 }               /* switch (ch->chunk_type) */
5633
5634
5635 next_chunk:
5636                 /* get the next chunk */
5637                 *offset += SCTP_SIZE32(chk_length);
5638                 if (*offset >= length) {
5639                         /* no more data left in the mbuf chain */
5640                         break;
5641                 }
5642                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
5643                     sizeof(struct sctp_chunkhdr), chunk_buf);
5644                 if (ch == NULL) {
5645                         if (locked_tcb) {
5646                                 SCTP_TCB_UNLOCK(locked_tcb);
5647                         }
5648                         *offset = length;
5649                         return (NULL);
5650                 }
5651         }                       /* while */
5652
5653         if (asconf_cnt > 0 && stcb != NULL) {
5654                 sctp_send_asconf_ack(stcb);
5655         }
5656         return (stcb);
5657 }
5658
5659
5660 /*
5661  * common input chunk processing (v4 and v6)
5662  */
5663 void
5664 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length,
5665     struct sockaddr *src, struct sockaddr *dst,
5666     struct sctphdr *sh, struct sctp_chunkhdr *ch,
5667 #if !defined(SCTP_WITH_NO_CSUM)
5668     uint8_t compute_crc,
5669 #endif
5670     uint8_t ecn_bits,
5671     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
5672     uint32_t vrf_id, uint16_t port)
5673 {
5674         uint32_t high_tsn;
5675         int fwd_tsn_seen = 0, data_processed = 0;
5676         struct mbuf *m = *mm, *op_err;
5677         char msg[SCTP_DIAG_INFO_LEN];
5678         int un_sent;
5679         int cnt_ctrl_ready = 0;
5680         struct sctp_inpcb *inp = NULL, *inp_decr = NULL;
5681         struct sctp_tcb *stcb = NULL;
5682         struct sctp_nets *net = NULL;
5683
5684         SCTP_STAT_INCR(sctps_recvdatagrams);
5685 #ifdef SCTP_AUDITING_ENABLED
5686         sctp_audit_log(0xE0, 1);
5687         sctp_auditing(0, inp, stcb, net);
5688 #endif
5689 #if !defined(SCTP_WITH_NO_CSUM)
5690         if (compute_crc != 0) {
5691                 uint32_t check, calc_check;
5692
5693                 check = sh->checksum;
5694                 sh->checksum = 0;
5695                 calc_check = sctp_calculate_cksum(m, iphlen);
5696                 sh->checksum = check;
5697                 if (calc_check != check) {
5698                         SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x  m:%p mlen:%d iphlen:%d\n",
5699                             calc_check, check, (void *)m, length, iphlen);
5700                         stcb = sctp_findassociation_addr(m, offset, src, dst,
5701                             sh, ch, &inp, &net, vrf_id);
5702 #if defined(INET) || defined(INET6)
5703                         if ((ch->chunk_type != SCTP_INITIATION) &&
5704                             (net != NULL) && (net->port != port)) {
5705                                 if (net->port == 0) {
5706                                         /* UDP encapsulation turned on. */
5707                                         net->mtu -= sizeof(struct udphdr);
5708                                         if (stcb->asoc.smallest_mtu > net->mtu) {
5709                                                 sctp_pathmtu_adjustment(stcb, net->mtu);
5710                                         }
5711                                 } else if (port == 0) {
5712                                         /* UDP encapsulation turned off. */
5713                                         net->mtu += sizeof(struct udphdr);
5714                                         /* XXX Update smallest_mtu */
5715                                 }
5716                                 net->port = port;
5717                         }
5718 #endif
5719                         if (net != NULL) {
5720                                 net->flowtype = mflowtype;
5721                                 net->flowid = mflowid;
5722                         }
5723                         if ((inp != NULL) && (stcb != NULL)) {
5724                                 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1);
5725                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED);
5726                         } else if ((inp != NULL) && (stcb == NULL)) {
5727                                 inp_decr = inp;
5728                         }
5729                         SCTP_STAT_INCR(sctps_badsum);
5730                         SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors);
5731                         goto out;
5732                 }
5733         }
5734 #endif
5735         /* Destination port of 0 is illegal, based on RFC4960. */
5736         if (sh->dest_port == 0) {
5737                 SCTP_STAT_INCR(sctps_hdrops);
5738                 goto out;
5739         }
5740         stcb = sctp_findassociation_addr(m, offset, src, dst,
5741             sh, ch, &inp, &net, vrf_id);
5742 #if defined(INET) || defined(INET6)
5743         if ((ch->chunk_type != SCTP_INITIATION) &&
5744             (net != NULL) && (net->port != port)) {
5745                 if (net->port == 0) {
5746                         /* UDP encapsulation turned on. */
5747                         net->mtu -= sizeof(struct udphdr);
5748                         if (stcb->asoc.smallest_mtu > net->mtu) {
5749                                 sctp_pathmtu_adjustment(stcb, net->mtu);
5750                         }
5751                 } else if (port == 0) {
5752                         /* UDP encapsulation turned off. */
5753                         net->mtu += sizeof(struct udphdr);
5754                         /* XXX Update smallest_mtu */
5755                 }
5756                 net->port = port;
5757         }
5758 #endif
5759         if (net != NULL) {
5760                 net->flowtype = mflowtype;
5761                 net->flowid = mflowid;
5762         }
5763         if (inp == NULL) {
5764                 SCTP_STAT_INCR(sctps_noport);
5765                 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) {
5766                         goto out;
5767                 }
5768                 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
5769                         sctp_send_shutdown_complete2(src, dst, sh,
5770                             mflowtype, mflowid, fibnum,
5771                             vrf_id, port);
5772                         goto out;
5773                 }
5774                 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) {
5775                         goto out;
5776                 }
5777                 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) {
5778                         if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) ||
5779                             ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) &&
5780                             (ch->chunk_type != SCTP_INIT))) {
5781                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5782                                     "Out of the blue");
5783                                 sctp_send_abort(m, iphlen, src, dst,
5784                                     sh, 0, op_err,
5785                                     mflowtype, mflowid, fibnum,
5786                                     vrf_id, port);
5787                         }
5788                 }
5789                 goto out;
5790         } else if (stcb == NULL) {
5791                 inp_decr = inp;
5792         }
5793         SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n",
5794             (void *)m, iphlen, offset, length, (void *)stcb);
5795         if (stcb) {
5796                 /* always clear this before beginning a packet */
5797                 stcb->asoc.authenticated = 0;
5798                 stcb->asoc.seen_a_sack_this_pkt = 0;
5799                 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n",
5800                     (void *)stcb, stcb->asoc.state);
5801
5802                 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) ||
5803                     (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) {
5804                         /*-
5805                          * If we hit here, we had a ref count
5806                          * up when the assoc was aborted and the
5807                          * timer is clearing out the assoc, we should
5808                          * NOT respond to any packet.. its OOTB.
5809                          */
5810                         SCTP_TCB_UNLOCK(stcb);
5811                         stcb = NULL;
5812                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5813                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5814                             msg);
5815                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5816                             mflowtype, mflowid, inp->fibnum,
5817                             vrf_id, port);
5818                         goto out;
5819                 }
5820         }
5821         if (IS_SCTP_CONTROL(ch)) {
5822                 /* process the control portion of the SCTP packet */
5823                 /* sa_ignore NO_NULL_CHK */
5824                 stcb = sctp_process_control(m, iphlen, &offset, length,
5825                     src, dst, sh, ch,
5826                     inp, stcb, &net, &fwd_tsn_seen,
5827                     mflowtype, mflowid, fibnum,
5828                     vrf_id, port);
5829                 if (stcb) {
5830                         /*
5831                          * This covers us if the cookie-echo was there and
5832                          * it changes our INP.
5833                          */
5834                         inp = stcb->sctp_ep;
5835 #if defined(INET) || defined(INET6)
5836                         if ((ch->chunk_type != SCTP_INITIATION) &&
5837                             (net != NULL) && (net->port != port)) {
5838                                 if (net->port == 0) {
5839                                         /* UDP encapsulation turned on. */
5840                                         net->mtu -= sizeof(struct udphdr);
5841                                         if (stcb->asoc.smallest_mtu > net->mtu) {
5842                                                 sctp_pathmtu_adjustment(stcb, net->mtu);
5843                                         }
5844                                 } else if (port == 0) {
5845                                         /* UDP encapsulation turned off. */
5846                                         net->mtu += sizeof(struct udphdr);
5847                                         /* XXX Update smallest_mtu */
5848                                 }
5849                                 net->port = port;
5850                         }
5851 #endif
5852                 }
5853         } else {
5854                 /*
5855                  * no control chunks, so pre-process DATA chunks (these
5856                  * checks are taken care of by control processing)
5857                  */
5858
5859                 /*
5860                  * if DATA only packet, and auth is required, then punt...
5861                  * can't have authenticated without any AUTH (control)
5862                  * chunks
5863                  */
5864                 if ((stcb != NULL) &&
5865                     (stcb->asoc.auth_supported == 1) &&
5866                     sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) {
5867                         /* "silently" ignore */
5868                         SCTP_STAT_INCR(sctps_recvauthmissing);
5869                         goto out;
5870                 }
5871                 if (stcb == NULL) {
5872                         /* out of the blue DATA chunk */
5873                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5874                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5875                             msg);
5876                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5877                             mflowtype, mflowid, fibnum,
5878                             vrf_id, port);
5879                         goto out;
5880                 }
5881                 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) {
5882                         /* v_tag mismatch! */
5883                         SCTP_STAT_INCR(sctps_badvtag);
5884                         goto out;
5885                 }
5886         }
5887
5888         if (stcb == NULL) {
5889                 /*
5890                  * no valid TCB for this packet, or we found it's a bad
5891                  * packet while processing control, or we're done with this
5892                  * packet (done or skip rest of data), so we drop it...
5893                  */
5894                 goto out;
5895         }
5896         /*
5897          * DATA chunk processing
5898          */
5899         /* plow through the data chunks while length > offset */
5900
5901         /*
5902          * Rest should be DATA only.  Check authentication state if AUTH for
5903          * DATA is required.
5904          */
5905         if ((length > offset) &&
5906             (stcb != NULL) &&
5907             (stcb->asoc.auth_supported == 1) &&
5908             sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) &&
5909             !stcb->asoc.authenticated) {
5910                 /* "silently" ignore */
5911                 SCTP_STAT_INCR(sctps_recvauthmissing);
5912                 SCTPDBG(SCTP_DEBUG_AUTH1,
5913                     "Data chunk requires AUTH, skipped\n");
5914                 goto trigger_send;
5915         }
5916         if (length > offset) {
5917                 int retval;
5918
5919                 /*
5920                  * First check to make sure our state is correct. We would
5921                  * not get here unless we really did have a tag, so we don't
5922                  * abort if this happens, just dump the chunk silently.
5923                  */
5924                 switch (SCTP_GET_STATE(&stcb->asoc)) {
5925                 case SCTP_STATE_COOKIE_ECHOED:
5926                         /*
5927                          * we consider data with valid tags in this state
5928                          * shows us the cookie-ack was lost. Imply it was
5929                          * there.
5930                          */
5931                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5932                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5933                                     stcb->asoc.overall_error_count,
5934                                     0,
5935                                     SCTP_FROM_SCTP_INPUT,
5936                                     __LINE__);
5937                         }
5938                         stcb->asoc.overall_error_count = 0;
5939                         sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net);
5940                         break;
5941                 case SCTP_STATE_COOKIE_WAIT:
5942                         /*
5943                          * We consider OOTB any data sent during asoc setup.
5944                          */
5945                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5946                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5947                             msg);
5948                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5949                             mflowtype, mflowid, inp->fibnum,
5950                             vrf_id, port);
5951                         goto out;
5952                         /* sa_ignore NOTREACHED */
5953                         break;
5954                 case SCTP_STATE_EMPTY:  /* should not happen */
5955                 case SCTP_STATE_INUSE:  /* should not happen */
5956                 case SCTP_STATE_SHUTDOWN_RECEIVED:      /* This is a peer error */
5957                 case SCTP_STATE_SHUTDOWN_ACK_SENT:
5958                 default:
5959                         goto out;
5960                         /* sa_ignore NOTREACHED */
5961                         break;
5962                 case SCTP_STATE_OPEN:
5963                 case SCTP_STATE_SHUTDOWN_SENT:
5964                         break;
5965                 }
5966                 /* plow through the data chunks while length > offset */
5967                 retval = sctp_process_data(mm, iphlen, &offset, length,
5968                     inp, stcb, net, &high_tsn);
5969                 if (retval == 2) {
5970                         /*
5971                          * The association aborted, NO UNLOCK needed since
5972                          * the association is destroyed.
5973                          */
5974                         stcb = NULL;
5975                         goto out;
5976                 }
5977                 data_processed = 1;
5978                 /*
5979                  * Anything important needs to have been m_copy'ed in
5980                  * process_data
5981                  */
5982         }
5983         /* take care of ecn */
5984         if ((data_processed == 1) &&
5985             (stcb->asoc.ecn_supported == 1) &&
5986             ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) {
5987                 /* Yep, we need to add a ECNE */
5988                 sctp_send_ecn_echo(stcb, net, high_tsn);
5989         }
5990         if ((data_processed == 0) && (fwd_tsn_seen)) {
5991                 int was_a_gap;
5992                 uint32_t highest_tsn;
5993
5994                 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) {
5995                         highest_tsn = stcb->asoc.highest_tsn_inside_nr_map;
5996                 } else {
5997                         highest_tsn = stcb->asoc.highest_tsn_inside_map;
5998                 }
5999                 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn);
6000                 stcb->asoc.send_sack = 1;
6001                 sctp_sack_check(stcb, was_a_gap);
6002         } else if (fwd_tsn_seen) {
6003                 stcb->asoc.send_sack = 1;
6004         }
6005         /* trigger send of any chunks in queue... */
6006 trigger_send:
6007 #ifdef SCTP_AUDITING_ENABLED
6008         sctp_audit_log(0xE0, 2);
6009         sctp_auditing(1, inp, stcb, net);
6010 #endif
6011         SCTPDBG(SCTP_DEBUG_INPUT1,
6012             "Check for chunk output prw:%d tqe:%d tf=%d\n",
6013             stcb->asoc.peers_rwnd,
6014             TAILQ_EMPTY(&stcb->asoc.control_send_queue),
6015             stcb->asoc.total_flight);
6016         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
6017         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
6018                 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq;
6019         }
6020         if (!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue) ||
6021             cnt_ctrl_ready ||
6022             stcb->asoc.trigger_reset ||
6023             ((un_sent) &&
6024             (stcb->asoc.peers_rwnd > 0 ||
6025             (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) {
6026                 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n");
6027                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
6028                 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n");
6029         }
6030 #ifdef SCTP_AUDITING_ENABLED
6031         sctp_audit_log(0xE0, 3);
6032         sctp_auditing(2, inp, stcb, net);
6033 #endif
6034 out:
6035         if (stcb != NULL) {
6036                 SCTP_TCB_UNLOCK(stcb);
6037         }
6038         if (inp_decr != NULL) {
6039                 /* reduce ref-count */
6040                 SCTP_INP_WLOCK(inp_decr);
6041                 SCTP_INP_DECR_REF(inp_decr);
6042                 SCTP_INP_WUNLOCK(inp_decr);
6043         }
6044         return;
6045 }
6046
6047 #ifdef INET
6048 void
6049 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port)
6050 {
6051         struct mbuf *m;
6052         int iphlen;
6053         uint32_t vrf_id = 0;
6054         uint8_t ecn_bits;
6055         struct sockaddr_in src, dst;
6056         struct ip *ip;
6057         struct sctphdr *sh;
6058         struct sctp_chunkhdr *ch;
6059         int length, offset;
6060 #if !defined(SCTP_WITH_NO_CSUM)
6061         uint8_t compute_crc;
6062 #endif
6063         uint32_t mflowid;
6064         uint8_t mflowtype;
6065         uint16_t fibnum;
6066
6067         iphlen = off;
6068         if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) {
6069                 SCTP_RELEASE_PKT(i_pak);
6070                 return;
6071         }
6072         m = SCTP_HEADER_TO_CHAIN(i_pak);
6073 #ifdef SCTP_MBUF_LOGGING
6074         /* Log in any input mbufs */
6075         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6076                 sctp_log_mbc(m, SCTP_MBUF_INPUT);
6077         }
6078 #endif
6079 #ifdef SCTP_PACKET_LOGGING
6080         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
6081                 sctp_packet_log(m);
6082         }
6083 #endif
6084         SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
6085             "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n",
6086             m->m_pkthdr.len,
6087             if_name(m->m_pkthdr.rcvif),
6088             (int)m->m_pkthdr.csum_flags, CSUM_BITS);
6089         mflowid = m->m_pkthdr.flowid;
6090         mflowtype = M_HASHTYPE_GET(m);
6091         fibnum = M_GETFIB(m);
6092         SCTP_STAT_INCR(sctps_recvpackets);
6093         SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
6094         /* Get IP, SCTP, and first chunk header together in the first mbuf. */
6095         offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
6096         if (SCTP_BUF_LEN(m) < offset) {
6097                 if ((m = m_pullup(m, offset)) == NULL) {
6098                         SCTP_STAT_INCR(sctps_hdrops);
6099                         return;
6100                 }
6101         }
6102         ip = mtod(m, struct ip *);
6103         sh = (struct sctphdr *)((caddr_t)ip + iphlen);
6104         ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr));
6105         offset -= sizeof(struct sctp_chunkhdr);
6106         memset(&src, 0, sizeof(struct sockaddr_in));
6107         src.sin_family = AF_INET;
6108         src.sin_len = sizeof(struct sockaddr_in);
6109         src.sin_port = sh->src_port;
6110         src.sin_addr = ip->ip_src;
6111         memset(&dst, 0, sizeof(struct sockaddr_in));
6112         dst.sin_family = AF_INET;
6113         dst.sin_len = sizeof(struct sockaddr_in);
6114         dst.sin_port = sh->dest_port;
6115         dst.sin_addr = ip->ip_dst;
6116         length = ntohs(ip->ip_len);
6117         /* Validate mbuf chain length with IP payload length. */
6118         if (SCTP_HEADER_LEN(m) != length) {
6119                 SCTPDBG(SCTP_DEBUG_INPUT1,
6120                     "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m));
6121                 SCTP_STAT_INCR(sctps_hdrops);
6122                 goto out;
6123         }
6124         /* SCTP does not allow broadcasts or multicasts */
6125         if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) {
6126                 goto out;
6127         }
6128         if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) {
6129                 goto out;
6130         }
6131         ecn_bits = ip->ip_tos;
6132 #if defined(SCTP_WITH_NO_CSUM)
6133         SCTP_STAT_INCR(sctps_recvnocrc);
6134 #else
6135         if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
6136                 SCTP_STAT_INCR(sctps_recvhwcrc);
6137                 compute_crc = 0;
6138         } else {
6139                 SCTP_STAT_INCR(sctps_recvswcrc);
6140                 compute_crc = 1;
6141         }
6142 #endif
6143         sctp_common_input_processing(&m, iphlen, offset, length,
6144             (struct sockaddr *)&src,
6145             (struct sockaddr *)&dst,
6146             sh, ch,
6147 #if !defined(SCTP_WITH_NO_CSUM)
6148             compute_crc,
6149 #endif
6150             ecn_bits,
6151             mflowtype, mflowid, fibnum,
6152             vrf_id, port);
6153 out:
6154         if (m) {
6155                 sctp_m_freem(m);
6156         }
6157         return;
6158 }
6159
6160 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
6161 extern int *sctp_cpuarry;
6162 #endif
6163
6164 int
6165 sctp_input(struct mbuf **mp, int *offp, int proto SCTP_UNUSED)
6166 {
6167         struct mbuf *m;
6168         int off;
6169
6170         m = *mp;
6171         off = *offp;
6172 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
6173         if (mp_ncpus > 1) {
6174                 struct ip *ip;
6175                 struct sctphdr *sh;
6176                 int offset;
6177                 int cpu_to_use;
6178                 uint32_t flowid, tag;
6179
6180                 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) {
6181                         flowid = m->m_pkthdr.flowid;
6182                 } else {
6183                         /*
6184                          * No flow id built by lower layers fix it so we
6185                          * create one.
6186                          */
6187                         offset = off + sizeof(struct sctphdr);
6188                         if (SCTP_BUF_LEN(m) < offset) {
6189                                 if ((m = m_pullup(m, offset)) == NULL) {
6190                                         SCTP_STAT_INCR(sctps_hdrops);
6191                                         return (IPPROTO_DONE);
6192                                 }
6193                         }
6194                         ip = mtod(m, struct ip *);
6195                         sh = (struct sctphdr *)((caddr_t)ip + off);
6196                         tag = htonl(sh->v_tag);
6197                         flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port);
6198                         m->m_pkthdr.flowid = flowid;
6199                         M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE_HASH);
6200                 }
6201                 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus];
6202                 sctp_queue_to_mcore(m, off, cpu_to_use);
6203                 return (IPPROTO_DONE);
6204         }
6205 #endif
6206         sctp_input_with_port(m, off, 0);
6207         return (IPPROTO_DONE);
6208 }
6209 #endif