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 listening socket. */
 165         if ((stcb == NULL) &&
 166             ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
 167             (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) ||
 168             (!SCTP_IS_LISTENING(inp)))) {
 169                 /*
 170                  * FIX ME ?? What about TCP model and we have a
 171                  * match/restart case? Actually no fix is needed. the lookup
 172                  * will always find the existing assoc so stcb would not be
 173                  * NULL. It may be questionable to do this since we COULD
 174                  * just send back the INIT-ACK and hope that the app did
 175                  * accept()'s by the time the COOKIE was sent. But there is
 176                  * a price to pay for COOKIE generation and I don't want to
 177                  * pay it on the chance that the app will actually do some
 178                  * accepts(). The App just looses and should NOT be in this
 179                  * state :-)
 180                  */
 181                 if (SCTP_BASE_SYSCTL(sctp_blackhole) == 0) {
 182                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 183                             "No listener");
 184                         sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err,
 185                             mflowtype, mflowid, inp->fibnum,
 186                             vrf_id, port);
 187                 }
 188                 goto outnow;
 189         }
 190         if ((stcb != NULL) &&
 191             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT)) {
 192                 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending SHUTDOWN-ACK\n");
 193                 sctp_send_shutdown_ack(stcb, NULL);
 194                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
 195         } else {
 196                 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n");
 197                 sctp_send_initiate_ack(inp, stcb, net, m, iphlen, offset,
 198                     src, dst, sh, cp,
 199                     mflowtype, mflowid,
 200                     vrf_id, port);
 201         }
 202 outnow:
 203         if (stcb == NULL) {
 204                 SCTP_INP_RUNLOCK(inp);
 205         }
 206 }
 207
 208 /*
 209  * process peer "INIT/INIT-ACK" chunk returns value < 0 on error
 210  */
 211
 212 int
 213 sctp_is_there_unsent_data(struct sctp_tcb *stcb, int so_locked
 214 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
 215     SCTP_UNUSED
 216 #endif
 217 )
 218 {
 219         int unsent_data;
 220         unsigned int i;
 221         struct sctp_stream_queue_pending *sp;
 222         struct sctp_association *asoc;
 223
 224         /*
 225          * This function returns if any stream has true unsent data on it.
 226          * Note that as it looks through it will clean up any places that
 227          * have old data that has been sent but left at top of stream queue.
 228          */
 229         asoc = &stcb->asoc;
 230         unsent_data = 0;
 231         SCTP_TCB_SEND_LOCK(stcb);
 232         if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
 233                 /* Check to see if some data queued */
 234                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
 235                         /* sa_ignore FREED_MEMORY */
 236                         sp = TAILQ_FIRST(&stcb->asoc.strmout[i].outqueue);
 237                         if (sp == NULL) {
 238                                 continue;
 239                         }
 240                         if ((sp->msg_is_complete) &&
 241                             (sp->length == 0) &&
 242                             (sp->sender_all_done)) {
 243                                 /*
 244                                  * We are doing differed cleanup. Last time
 245                                  * through when we took all the data the
 246                                  * sender_all_done was not set.
 247                                  */
 248                                 if (sp->put_last_out == 0) {
 249                                         SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
 250                                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n",
 251                                             sp->sender_all_done,
 252                                             sp->length,
 253                                             sp->msg_is_complete,
 254                                             sp->put_last_out);
 255                                 }
 256                                 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1);
 257                                 TAILQ_REMOVE(&stcb->asoc.strmout[i].outqueue, sp, next);
 258                                 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, &asoc->strmout[i], sp, 1);
 259                                 if (sp->net) {
 260                                         sctp_free_remote_addr(sp->net);
 261                                         sp->net = NULL;
 262                                 }
 263                                 if (sp->data) {
 264                                         sctp_m_freem(sp->data);
 265                                         sp->data = NULL;
 266                                 }
 267                                 sctp_free_a_strmoq(stcb, sp, so_locked);
 268                                 if (!TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
 269                                         unsent_data++;
 270                                 }
 271                         } else {
 272                                 unsent_data++;
 273                         }
 274                         if (unsent_data > 0) {
 275                                 break;
 276                         }
 277                 }
 278         }
 279         SCTP_TCB_SEND_UNLOCK(stcb);
 280         return (unsent_data);
 281 }
 282
 283 static int
 284 sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb)
 285 {
 286         struct sctp_init *init;
 287         struct sctp_association *asoc;
 288         struct sctp_nets *lnet;
 289         unsigned int i;
 290
 291         init = &cp->init;
 292         asoc = &stcb->asoc;
 293         /* save off parameters */
 294         asoc->peer_vtag = ntohl(init->initiate_tag);
 295         asoc->peers_rwnd = ntohl(init->a_rwnd);
 296         /* init tsn's */
 297         asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1;
 298
 299         if (!TAILQ_EMPTY(&asoc->nets)) {
 300                 /* update any ssthresh's that may have a default */
 301                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
 302                         lnet->ssthresh = asoc->peers_rwnd;
 303                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) {
 304                                 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION);
 305                         }
 306                 }
 307         }
 308         SCTP_TCB_SEND_LOCK(stcb);
 309         if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) {
 310                 unsigned int newcnt;
 311                 struct sctp_stream_out *outs;
 312                 struct sctp_stream_queue_pending *sp, *nsp;
 313                 struct sctp_tmit_chunk *chk, *nchk;
 314
 315                 /* abandon the upper streams */
 316                 newcnt = ntohs(init->num_inbound_streams);
 317                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
 318                         if (chk->rec.data.sid >= newcnt) {
 319                                 TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next);
 320                                 asoc->send_queue_cnt--;
 321                                 if (asoc->strmout[chk->rec.data.sid].chunks_on_queues > 0) {
 322                                         asoc->strmout[chk->rec.data.sid].chunks_on_queues--;
 323 #ifdef INVARIANTS
 324                                 } else {
 325                                         panic("No chunks on the queues for sid %u.", chk->rec.data.sid);
 326 #endif
 327                                 }
 328                                 if (chk->data != NULL) {
 329                                         sctp_free_bufspace(stcb, asoc, chk, 1);
 330                                         sctp_ulp_notify(SCTP_NOTIFY_UNSENT_DG_FAIL, stcb,
 331                                             0, chk, SCTP_SO_NOT_LOCKED);
 332                                         if (chk->data) {
 333                                                 sctp_m_freem(chk->data);
 334                                                 chk->data = NULL;
 335                                         }
 336                                 }
 337                                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
 338                                 /* sa_ignore FREED_MEMORY */
 339                         }
 340                 }
 341                 if (asoc->strmout) {
 342                         for (i = newcnt; i < asoc->pre_open_streams; i++) {
 343                                 outs = &asoc->strmout[i];
 344                                 TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) {
 345                                         atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1);
 346                                         TAILQ_REMOVE(&outs->outqueue, sp, next);
 347                                         stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, outs, sp, 1);
 348                                         sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL,
 349                                             stcb, 0, sp, SCTP_SO_NOT_LOCKED);
 350                                         if (sp->data) {
 351                                                 sctp_m_freem(sp->data);
 352                                                 sp->data = NULL;
 353                                         }
 354                                         if (sp->net) {
 355                                                 sctp_free_remote_addr(sp->net);
 356                                                 sp->net = NULL;
 357                                         }
 358                                         /* Free the chunk */
 359                                         sctp_free_a_strmoq(stcb, sp, SCTP_SO_NOT_LOCKED);
 360                                         /* sa_ignore FREED_MEMORY */
 361                                 }
 362                                 outs->state = SCTP_STREAM_CLOSED;
 363                         }
 364                 }
 365                 /* cut back the count */
 366                 asoc->pre_open_streams = newcnt;
 367         }
 368         SCTP_TCB_SEND_UNLOCK(stcb);
 369         asoc->streamoutcnt = asoc->pre_open_streams;
 370         if (asoc->strmout) {
 371                 for (i = 0; i < asoc->streamoutcnt; i++) {
 372                         asoc->strmout[i].state = SCTP_STREAM_OPEN;
 373                 }
 374         }
 375         /* EY - nr_sack: initialize highest tsn in nr_mapping_array */
 376         asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
 377         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
 378                 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
 379         }
 380         /* This is the next one we expect */
 381         asoc->str_reset_seq_in = asoc->asconf_seq_in + 1;
 382
 383         asoc->mapping_array_base_tsn = ntohl(init->initial_tsn);
 384         asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in;
 385
 386         asoc->advanced_peer_ack_point = asoc->last_acked_seq;
 387         /* open the requested streams */
 388
 389         if (asoc->strmin != NULL) {
 390                 /* Free the old ones */
 391                 for (i = 0; i < asoc->streamincnt; i++) {
 392                         sctp_clean_up_stream(stcb, &asoc->strmin[i].inqueue);
 393                         sctp_clean_up_stream(stcb, &asoc->strmin[i].uno_inqueue);
 394                 }
 395                 SCTP_FREE(asoc->strmin, SCTP_M_STRMI);
 396         }
 397         if (asoc->max_inbound_streams > ntohs(init->num_outbound_streams)) {
 398                 asoc->streamincnt = ntohs(init->num_outbound_streams);
 399         } else {
 400                 asoc->streamincnt = asoc->max_inbound_streams;
 401         }
 402         SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt *
 403             sizeof(struct sctp_stream_in), SCTP_M_STRMI);
 404         if (asoc->strmin == NULL) {
 405                 /* we didn't get memory for the streams! */
 406                 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n");
 407                 return (-1);
 408         }
 409         for (i = 0; i < asoc->streamincnt; i++) {
 410                 asoc->strmin[i].sid = i;
 411                 asoc->strmin[i].last_mid_delivered = 0xffffffff;
 412                 TAILQ_INIT(&asoc->strmin[i].inqueue);
 413                 TAILQ_INIT(&asoc->strmin[i].uno_inqueue);
 414                 asoc->strmin[i].pd_api_started = 0;
 415                 asoc->strmin[i].delivery_started = 0;
 416         }
 417         /*
 418          * load_address_from_init will put the addresses into the
 419          * association when the COOKIE is processed or the INIT-ACK is
 420          * processed. Both types of COOKIE's existing and new call this
 421          * routine. It will remove addresses that are no longer in the
 422          * association (for the restarting case where addresses are
 423          * removed). Up front when the INIT arrives we will discard it if it
 424          * is a restart and new addresses have been added.
 425          */
 426         /* sa_ignore MEMLEAK */
 427         return (0);
 428 }
 429
 430 /*
 431  * INIT-ACK message processing/consumption returns value < 0 on error
 432  */
 433 static int
 434 sctp_process_init_ack(struct mbuf *m, int iphlen, int offset,
 435     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
 436     struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
 437     struct sctp_nets *net, int *abort_no_unlock,
 438     uint8_t mflowtype, uint32_t mflowid,
 439     uint32_t vrf_id)
 440 {
 441         struct sctp_association *asoc;
 442         struct mbuf *op_err;
 443         int retval, abort_flag;
 444         uint32_t initack_limit;
 445         int nat_friendly = 0;
 446
 447         /* First verify that we have no illegal param's */
 448         abort_flag = 0;
 449
 450         op_err = sctp_arethere_unrecognized_parameters(m,
 451             (offset + sizeof(struct sctp_init_chunk)),
 452             &abort_flag, (struct sctp_chunkhdr *)cp, &nat_friendly);
 453         if (abort_flag) {
 454                 /* Send an abort and notify peer */
 455                 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
 456                 *abort_no_unlock = 1;
 457                 return (-1);
 458         }
 459         asoc = &stcb->asoc;
 460         asoc->peer_supports_nat = (uint8_t)nat_friendly;
 461         /* process the peer's parameters in the INIT-ACK */
 462         retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb);
 463         if (retval < 0) {
 464                 return (retval);
 465         }
 466         initack_limit = offset + ntohs(cp->ch.chunk_length);
 467         /* load all addresses */
 468         if ((retval = sctp_load_addresses_from_init(stcb, m,
 469             (offset + sizeof(struct sctp_init_chunk)), initack_limit,
 470             src, dst, NULL, stcb->asoc.port))) {
 471                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 472                     "Problem with address parameters");
 473                 SCTPDBG(SCTP_DEBUG_INPUT1,
 474                     "Load addresses from INIT causes an abort %d\n",
 475                     retval);
 476                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
 477                     src, dst, sh, op_err,
 478                     mflowtype, mflowid,
 479                     vrf_id, net->port);
 480                 *abort_no_unlock = 1;
 481                 return (-1);
 482         }
 483         /* if the peer doesn't support asconf, flush the asconf queue */
 484         if (asoc->asconf_supported == 0) {
 485                 struct sctp_asconf_addr *param, *nparam;
 486
 487                 TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) {
 488                         TAILQ_REMOVE(&asoc->asconf_queue, param, next);
 489                         SCTP_FREE(param, SCTP_M_ASC_ADDR);
 490                 }
 491         }
 492         stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs,
 493             stcb->asoc.local_hmacs);
 494         if (op_err) {
 495                 sctp_queue_op_err(stcb, op_err);
 496                 /* queuing will steal away the mbuf chain to the out queue */
 497                 op_err = NULL;
 498         }
 499         /* extract the cookie and queue it to "echo" it back... */
 500         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 501                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
 502                     stcb->asoc.overall_error_count,
 503                     0,
 504                     SCTP_FROM_SCTP_INPUT,
 505                     __LINE__);
 506         }
 507         stcb->asoc.overall_error_count = 0;
 508         net->error_count = 0;
 509
 510         /*
 511          * Cancel the INIT timer, We do this first before queueing the
 512          * cookie. We always cancel at the primary to assue that we are
 513          * canceling the timer started by the INIT which always goes to the
 514          * primary.
 515          */
 516         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb,
 517             asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3);
 518
 519         /* calculate the RTO */
 520         net->RTO = sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered,
 521             SCTP_RTT_FROM_NON_DATA);
 522         retval = sctp_send_cookie_echo(m, offset, stcb, net);
 523         if (retval < 0) {
 524                 /*
 525                  * No cookie, we probably should send a op error. But in any
 526                  * case if there is no cookie in the INIT-ACK, we can
 527                  * abandon the peer, its broke.
 528                  */
 529                 if (retval == -3) {
 530                         uint16_t len;
 531
 532                         len = (uint16_t)(sizeof(struct sctp_error_missing_param) + sizeof(uint16_t));
 533                         /* We abort with an error of missing mandatory param */
 534                         op_err = sctp_get_mbuf_for_msg(len, 0, M_NOWAIT, 1, MT_DATA);
 535                         if (op_err != NULL) {
 536                                 struct sctp_error_missing_param *cause;
 537
 538                                 SCTP_BUF_LEN(op_err) = len;
 539                                 cause = mtod(op_err, struct sctp_error_missing_param *);
 540                                 /* Subtract the reserved param */
 541                                 cause->cause.code = htons(SCTP_CAUSE_MISSING_PARAM);
 542                                 cause->cause.length = htons(len);
 543                                 cause->num_missing_params = htonl(1);
 544                                 cause->type[0] = htons(SCTP_STATE_COOKIE);
 545                         }
 546                         sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
 547                             src, dst, sh, op_err,
 548                             mflowtype, mflowid,
 549                             vrf_id, net->port);
 550                         *abort_no_unlock = 1;
 551                 }
 552                 return (retval);
 553         }
 554         return (0);
 555 }
 556
 557 static void
 558 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp,
 559     struct sctp_tcb *stcb, struct sctp_nets *net)
 560 {
 561         union sctp_sockstore store;
 562         struct sctp_nets *r_net, *f_net;
 563         struct timeval tv;
 564         int req_prim = 0;
 565         uint16_t old_error_counter;
 566
 567         if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) {
 568                 /* Invalid length */
 569                 return;
 570         }
 571         memset(&store, 0, sizeof(store));
 572         switch (cp->heartbeat.hb_info.addr_family) {
 573 #ifdef INET
 574         case AF_INET:
 575                 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) {
 576                         store.sin.sin_family = cp->heartbeat.hb_info.addr_family;
 577                         store.sin.sin_len = cp->heartbeat.hb_info.addr_len;
 578                         store.sin.sin_port = stcb->rport;
 579                         memcpy(&store.sin.sin_addr, cp->heartbeat.hb_info.address,
 580                             sizeof(store.sin.sin_addr));
 581                 } else {
 582                         return;
 583                 }
 584                 break;
 585 #endif
 586 #ifdef INET6
 587         case AF_INET6:
 588                 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) {
 589                         store.sin6.sin6_family = cp->heartbeat.hb_info.addr_family;
 590                         store.sin6.sin6_len = cp->heartbeat.hb_info.addr_len;
 591                         store.sin6.sin6_port = stcb->rport;
 592                         memcpy(&store.sin6.sin6_addr, cp->heartbeat.hb_info.address, sizeof(struct in6_addr));
 593                 } else {
 594                         return;
 595                 }
 596                 break;
 597 #endif
 598         default:
 599                 return;
 600         }
 601         r_net = sctp_findnet(stcb, &store.sa);
 602         if (r_net == NULL) {
 603                 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n");
 604                 return;
 605         }
 606         if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) &&
 607             (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) &&
 608             (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) {
 609                 /*
 610                  * If the its a HB and it's random value is correct when can
 611                  * confirm the destination.
 612                  */
 613                 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
 614                 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) {
 615                         stcb->asoc.primary_destination = r_net;
 616                         r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY;
 617                         f_net = TAILQ_FIRST(&stcb->asoc.nets);
 618                         if (f_net != r_net) {
 619                                 /*
 620                                  * first one on the list is NOT the primary
 621                                  * sctp_cmpaddr() is much more efficient if
 622                                  * the primary is the first on the list,
 623                                  * make it so.
 624                                  */
 625                                 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next);
 626                                 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next);
 627                         }
 628                         req_prim = 1;
 629                 }
 630                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
 631                     stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED);
 632                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb,
 633                     r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4);
 634                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
 635         }
 636         old_error_counter = r_net->error_count;
 637         r_net->error_count = 0;
 638         r_net->hb_responded = 1;
 639         tv.tv_sec = cp->heartbeat.hb_info.time_value_1;
 640         tv.tv_usec = cp->heartbeat.hb_info.time_value_2;
 641         /* Now lets do a RTO with this */
 642         r_net->RTO = sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv,
 643             SCTP_RTT_FROM_NON_DATA);
 644         if (!(r_net->dest_state & SCTP_ADDR_REACHABLE)) {
 645                 r_net->dest_state |= SCTP_ADDR_REACHABLE;
 646                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb,
 647                     0, (void *)r_net, SCTP_SO_NOT_LOCKED);
 648         }
 649         if (r_net->dest_state & SCTP_ADDR_PF) {
 650                 r_net->dest_state &= ~SCTP_ADDR_PF;
 651                 stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net);
 652         }
 653         if (old_error_counter > 0) {
 654                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
 655                     stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_5);
 656                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
 657         }
 658         if (r_net == stcb->asoc.primary_destination) {
 659                 if (stcb->asoc.alternate) {
 660                         /* release the alternate, primary is good */
 661                         sctp_free_remote_addr(stcb->asoc.alternate);
 662                         stcb->asoc.alternate = NULL;
 663                 }
 664         }
 665         /* Mobility adaptation */
 666         if (req_prim) {
 667                 if ((sctp_is_mobility_feature_on(stcb->sctp_ep,
 668                     SCTP_MOBILITY_BASE) ||
 669                     sctp_is_mobility_feature_on(stcb->sctp_ep,
 670                     SCTP_MOBILITY_FASTHANDOFF)) &&
 671                     sctp_is_mobility_feature_on(stcb->sctp_ep,
 672                     SCTP_MOBILITY_PRIM_DELETED)) {
 673
 674                         sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED,
 675                             stcb->sctp_ep, stcb, NULL,
 676                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_6);
 677                         if (sctp_is_mobility_feature_on(stcb->sctp_ep,
 678                             SCTP_MOBILITY_FASTHANDOFF)) {
 679                                 sctp_assoc_immediate_retrans(stcb,
 680                                     stcb->asoc.primary_destination);
 681                         }
 682                         if (sctp_is_mobility_feature_on(stcb->sctp_ep,
 683                             SCTP_MOBILITY_BASE)) {
 684                                 sctp_move_chunks_from_net(stcb,
 685                                     stcb->asoc.deleted_primary);
 686                         }
 687                         sctp_delete_prim_timer(stcb->sctp_ep, stcb,
 688                             stcb->asoc.deleted_primary);
 689                 }
 690         }
 691 }
 692
 693 static int
 694 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb)
 695 {
 696         /*
 697          * return 0 means we want you to proceed with the abort non-zero
 698          * means no abort processing
 699          */
 700         struct sctpasochead *head;
 701
 702         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_WAIT) ||
 703             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) {
 704                 atomic_add_int(&stcb->asoc.refcnt, 1);
 705                 SCTP_TCB_UNLOCK(stcb);
 706                 SCTP_INP_INFO_WLOCK();
 707                 SCTP_TCB_LOCK(stcb);
 708                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 709         }
 710         if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_WAIT) {
 711                 /* generate a new vtag and send init */
 712                 LIST_REMOVE(stcb, sctp_asocs);
 713                 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1);
 714                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
 715                 /*
 716                  * put it in the bucket in the vtag hash of assoc's for the
 717                  * system
 718                  */
 719                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
 720                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
 721                 SCTP_INP_INFO_WUNLOCK();
 722                 return (1);
 723         }
 724         if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) {
 725                 /*
 726                  * treat like a case where the cookie expired i.e.: - dump
 727                  * current cookie. - generate a new vtag. - resend init.
 728                  */
 729                 /* generate a new vtag and send init */
 730                 LIST_REMOVE(stcb, sctp_asocs);
 731                 stcb->asoc.state &= ~SCTP_STATE_COOKIE_ECHOED;
 732                 stcb->asoc.state |= SCTP_STATE_COOKIE_WAIT;
 733                 sctp_stop_all_cookie_timers(stcb);
 734                 sctp_toss_old_cookies(stcb, &stcb->asoc);
 735                 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1);
 736                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
 737                 /*
 738                  * put it in the bucket in the vtag hash of assoc's for the
 739                  * system
 740                  */
 741                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
 742                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
 743                 SCTP_INP_INFO_WUNLOCK();
 744                 return (1);
 745         }
 746         return (0);
 747 }
 748
 749 static int
 750 sctp_handle_nat_missing_state(struct sctp_tcb *stcb,
 751     struct sctp_nets *net)
 752 {
 753         /*
 754          * return 0 means we want you to proceed with the abort non-zero
 755          * means no abort processing
 756          */
 757         if (stcb->asoc.auth_supported == 0) {
 758                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n");
 759                 return (0);
 760         }
 761         sctp_asconf_send_nat_state_update(stcb, net);
 762         return (1);
 763 }
 764
 765
 766 static void
 767 sctp_handle_abort(struct sctp_abort_chunk *abort,
 768     struct sctp_tcb *stcb, struct sctp_nets *net)
 769 {
 770 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 771         struct socket *so;
 772 #endif
 773         uint16_t len;
 774         uint16_t error;
 775
 776         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n");
 777         if (stcb == NULL)
 778                 return;
 779
 780         len = ntohs(abort->ch.chunk_length);
 781         if (len > sizeof(struct sctp_chunkhdr)) {
 782                 /*
 783                  * Need to check the cause codes for our two magic nat
 784                  * aborts which don't kill the assoc necessarily.
 785                  */
 786                 struct sctp_gen_error_cause *cause;
 787
 788                 cause = (struct sctp_gen_error_cause *)(abort + 1);
 789                 error = ntohs(cause->code);
 790                 if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) {
 791                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n",
 792                             abort->ch.chunk_flags);
 793                         if (sctp_handle_nat_colliding_state(stcb)) {
 794                                 return;
 795                         }
 796                 } else if (error == SCTP_CAUSE_NAT_MISSING_STATE) {
 797                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n",
 798                             abort->ch.chunk_flags);
 799                         if (sctp_handle_nat_missing_state(stcb, net)) {
 800                                 return;
 801                         }
 802                 }
 803         } else {
 804                 error = 0;
 805         }
 806         /* stop any receive timers */
 807         sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net,
 808             SCTP_FROM_SCTP_INPUT + SCTP_LOC_7);
 809         /* notify user of the abort and clean up... */
 810         sctp_abort_notification(stcb, 1, error, abort, SCTP_SO_NOT_LOCKED);
 811         /* free the tcb */
 812         SCTP_STAT_INCR_COUNTER32(sctps_aborted);
 813         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) ||
 814             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
 815                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 816         }
 817 #ifdef SCTP_ASOCLOG_OF_TSNS
 818         sctp_print_out_track_log(stcb);
 819 #endif
 820 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 821         so = SCTP_INP_SO(stcb->sctp_ep);
 822         atomic_add_int(&stcb->asoc.refcnt, 1);
 823         SCTP_TCB_UNLOCK(stcb);
 824         SCTP_SOCKET_LOCK(so, 1);
 825         SCTP_TCB_LOCK(stcb);
 826         atomic_subtract_int(&stcb->asoc.refcnt, 1);
 827 #endif
 828         stcb->asoc.state |= SCTP_STATE_WAS_ABORTED;
 829         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
 830             SCTP_FROM_SCTP_INPUT + SCTP_LOC_8);
 831 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 832         SCTP_SOCKET_UNLOCK(so, 1);
 833 #endif
 834         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n");
 835 }
 836
 837 static void
 838 sctp_start_net_timers(struct sctp_tcb *stcb)
 839 {
 840         uint32_t cnt_hb_sent;
 841         struct sctp_nets *net;
 842
 843         cnt_hb_sent = 0;
 844         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
 845                 /*
 846                  * For each network start: 1) A pmtu timer. 2) A HB timer 3)
 847                  * If the dest in unconfirmed send a hb as well if under
 848                  * max_hb_burst have been sent.
 849                  */
 850                 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net);
 851                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net);
 852                 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) &&
 853                     (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) {
 854                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
 855                         cnt_hb_sent++;
 856                 }
 857         }
 858         if (cnt_hb_sent) {
 859                 sctp_chunk_output(stcb->sctp_ep, stcb,
 860                     SCTP_OUTPUT_FROM_COOKIE_ACK,
 861                     SCTP_SO_NOT_LOCKED);
 862         }
 863 }
 864
 865
 866 static void
 867 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp,
 868     struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag)
 869 {
 870         struct sctp_association *asoc;
 871         int some_on_streamwheel;
 872         int old_state;
 873 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 874         struct socket *so;
 875 #endif
 876
 877         SCTPDBG(SCTP_DEBUG_INPUT2,
 878             "sctp_handle_shutdown: handling SHUTDOWN\n");
 879         if (stcb == NULL)
 880                 return;
 881         asoc = &stcb->asoc;
 882         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
 883             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
 884                 return;
 885         }
 886         if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) {
 887                 /* Shutdown NOT the expected size */
 888                 return;
 889         }
 890         old_state = SCTP_GET_STATE(asoc);
 891         sctp_update_acked(stcb, cp, abort_flag);
 892         if (*abort_flag) {
 893                 return;
 894         }
 895         if (asoc->control_pdapi) {
 896                 /*
 897                  * With a normal shutdown we assume the end of last record.
 898                  */
 899                 SCTP_INP_READ_LOCK(stcb->sctp_ep);
 900                 if (asoc->control_pdapi->on_strm_q) {
 901                         struct sctp_stream_in *strm;
 902
 903                         strm = &asoc->strmin[asoc->control_pdapi->sinfo_stream];
 904                         if (asoc->control_pdapi->on_strm_q == SCTP_ON_UNORDERED) {
 905                                 /* Unordered */
 906                                 TAILQ_REMOVE(&strm->uno_inqueue, asoc->control_pdapi, next_instrm);
 907                                 asoc->control_pdapi->on_strm_q = 0;
 908                         } else if (asoc->control_pdapi->on_strm_q == SCTP_ON_ORDERED) {
 909                                 /* Ordered */
 910                                 TAILQ_REMOVE(&strm->inqueue, asoc->control_pdapi, next_instrm);
 911                                 asoc->control_pdapi->on_strm_q = 0;
 912 #ifdef INVARIANTS
 913                         } else {
 914                                 panic("Unknown state on ctrl:%p on_strm_q:%d",
 915                                     asoc->control_pdapi,
 916                                     asoc->control_pdapi->on_strm_q);
 917 #endif
 918                         }
 919                 }
 920                 asoc->control_pdapi->end_added = 1;
 921                 asoc->control_pdapi->pdapi_aborted = 1;
 922                 asoc->control_pdapi = NULL;
 923                 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
 924 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 925                 so = SCTP_INP_SO(stcb->sctp_ep);
 926                 atomic_add_int(&stcb->asoc.refcnt, 1);
 927                 SCTP_TCB_UNLOCK(stcb);
 928                 SCTP_SOCKET_LOCK(so, 1);
 929                 SCTP_TCB_LOCK(stcb);
 930                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 931                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
 932                         /* assoc was freed while we were unlocked */
 933                         SCTP_SOCKET_UNLOCK(so, 1);
 934                         return;
 935                 }
 936 #endif
 937                 if (stcb->sctp_socket) {
 938                         sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
 939                 }
 940 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 941                 SCTP_SOCKET_UNLOCK(so, 1);
 942 #endif
 943         }
 944         /* goto SHUTDOWN_RECEIVED state to block new requests */
 945         if (stcb->sctp_socket) {
 946                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
 947                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) &&
 948                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) {
 949                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_RECEIVED);
 950                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
 951                         /*
 952                          * notify upper layer that peer has initiated a
 953                          * shutdown
 954                          */
 955                         sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
 956
 957                         /* reset time */
 958                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
 959                 }
 960         }
 961         if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) {
 962                 /*
 963                  * stop the shutdown timer, since we WILL move to
 964                  * SHUTDOWN-ACK-SENT.
 965                  */
 966                 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
 967                     net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9);
 968         }
 969         /* Now is there unsent data on a stream somewhere? */
 970         some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED);
 971
 972         if (!TAILQ_EMPTY(&asoc->send_queue) ||
 973             !TAILQ_EMPTY(&asoc->sent_queue) ||
 974             some_on_streamwheel) {
 975                 /* By returning we will push more data out */
 976                 return;
 977         } else {
 978                 /* no outstanding data to send, so move on... */
 979                 /* send SHUTDOWN-ACK */
 980                 /* move to SHUTDOWN-ACK-SENT state */
 981                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
 982                     (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
 983                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 984                 }
 985                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
 986                 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
 987                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT);
 988                         sctp_stop_timers_for_shutdown(stcb);
 989                         sctp_send_shutdown_ack(stcb, net);
 990                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK,
 991                             stcb->sctp_ep, stcb, net);
 992                 } else if (old_state == SCTP_STATE_SHUTDOWN_ACK_SENT) {
 993                         sctp_send_shutdown_ack(stcb, net);
 994                 }
 995         }
 996 }
 997
 998 static void
 999 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED,
1000     struct sctp_tcb *stcb,
1001     struct sctp_nets *net)
1002 {
1003         struct sctp_association *asoc;
1004 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1005         struct socket *so;
1006
1007         so = SCTP_INP_SO(stcb->sctp_ep);
1008 #endif
1009         SCTPDBG(SCTP_DEBUG_INPUT2,
1010             "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n");
1011         if (stcb == NULL)
1012                 return;
1013
1014         asoc = &stcb->asoc;
1015         /* process according to association state */
1016         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
1017             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
1018                 /* unexpected SHUTDOWN-ACK... do OOTB handling... */
1019                 sctp_send_shutdown_complete(stcb, net, 1);
1020                 SCTP_TCB_UNLOCK(stcb);
1021                 return;
1022         }
1023         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
1024             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
1025                 /* unexpected SHUTDOWN-ACK... so ignore... */
1026                 SCTP_TCB_UNLOCK(stcb);
1027                 return;
1028         }
1029         if (asoc->control_pdapi) {
1030                 /*
1031                  * With a normal shutdown we assume the end of last record.
1032                  */
1033                 SCTP_INP_READ_LOCK(stcb->sctp_ep);
1034                 asoc->control_pdapi->end_added = 1;
1035                 asoc->control_pdapi->pdapi_aborted = 1;
1036                 asoc->control_pdapi = NULL;
1037                 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
1038 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1039                 atomic_add_int(&stcb->asoc.refcnt, 1);
1040                 SCTP_TCB_UNLOCK(stcb);
1041                 SCTP_SOCKET_LOCK(so, 1);
1042                 SCTP_TCB_LOCK(stcb);
1043                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
1044                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1045                         /* assoc was freed while we were unlocked */
1046                         SCTP_SOCKET_UNLOCK(so, 1);
1047                         return;
1048                 }
1049 #endif
1050                 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
1051 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1052                 SCTP_SOCKET_UNLOCK(so, 1);
1053 #endif
1054         }
1055 #ifdef INVARIANTS
1056         if (!TAILQ_EMPTY(&asoc->send_queue) ||
1057             !TAILQ_EMPTY(&asoc->sent_queue) ||
1058             sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) {
1059                 panic("Queues are not empty when handling SHUTDOWN-ACK");
1060         }
1061 #endif
1062         /* stop the timer */
1063         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net,
1064             SCTP_FROM_SCTP_INPUT + SCTP_LOC_10);
1065         /* send SHUTDOWN-COMPLETE */
1066         sctp_send_shutdown_complete(stcb, net, 0);
1067         /* notify upper layer protocol */
1068         if (stcb->sctp_socket) {
1069                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1070                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
1071                         stcb->sctp_socket->so_snd.sb_cc = 0;
1072                 }
1073                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
1074         }
1075         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
1076         /* free the TCB but first save off the ep */
1077 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1078         atomic_add_int(&stcb->asoc.refcnt, 1);
1079         SCTP_TCB_UNLOCK(stcb);
1080         SCTP_SOCKET_LOCK(so, 1);
1081         SCTP_TCB_LOCK(stcb);
1082         atomic_subtract_int(&stcb->asoc.refcnt, 1);
1083 #endif
1084         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1085             SCTP_FROM_SCTP_INPUT + SCTP_LOC_11);
1086 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1087         SCTP_SOCKET_UNLOCK(so, 1);
1088 #endif
1089 }
1090
1091 /*
1092  * Skip past the param header and then we will find the chunk that caused the
1093  * problem. There are two possibilities ASCONF or FWD-TSN other than that and
1094  * our peer must be broken.
1095  */
1096 static void
1097 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr,
1098     struct sctp_nets *net)
1099 {
1100         struct sctp_chunkhdr *chk;
1101
1102         chk = (struct sctp_chunkhdr *)((caddr_t)phdr + sizeof(*phdr));
1103         switch (chk->chunk_type) {
1104         case SCTP_ASCONF_ACK:
1105         case SCTP_ASCONF:
1106                 sctp_asconf_cleanup(stcb, net);
1107                 break;
1108         case SCTP_IFORWARD_CUM_TSN:
1109         case SCTP_FORWARD_CUM_TSN:
1110                 stcb->asoc.prsctp_supported = 0;
1111                 break;
1112         default:
1113                 SCTPDBG(SCTP_DEBUG_INPUT2,
1114                     "Peer does not support chunk type %d(%x)??\n",
1115                     chk->chunk_type, (uint32_t)chk->chunk_type);
1116                 break;
1117         }
1118 }
1119
1120 /*
1121  * Skip past the param header and then we will find the param that caused the
1122  * problem.  There are a number of param's in a ASCONF OR the prsctp param
1123  * these will turn of specific features.
1124  * XXX: Is this the right thing to do?
1125  */
1126 static void
1127 sctp_process_unrecog_param(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr)
1128 {
1129         struct sctp_paramhdr *pbad;
1130
1131         pbad = phdr + 1;
1132         switch (ntohs(pbad->param_type)) {
1133                 /* pr-sctp draft */
1134         case SCTP_PRSCTP_SUPPORTED:
1135                 stcb->asoc.prsctp_supported = 0;
1136                 break;
1137         case SCTP_SUPPORTED_CHUNK_EXT:
1138                 break;
1139                 /* draft-ietf-tsvwg-addip-sctp */
1140         case SCTP_HAS_NAT_SUPPORT:
1141                 stcb->asoc.peer_supports_nat = 0;
1142                 break;
1143         case SCTP_ADD_IP_ADDRESS:
1144         case SCTP_DEL_IP_ADDRESS:
1145         case SCTP_SET_PRIM_ADDR:
1146                 stcb->asoc.asconf_supported = 0;
1147                 break;
1148         case SCTP_SUCCESS_REPORT:
1149         case SCTP_ERROR_CAUSE_IND:
1150                 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n");
1151                 SCTPDBG(SCTP_DEBUG_INPUT2,
1152                     "Turning off ASCONF to this strange peer\n");
1153                 stcb->asoc.asconf_supported = 0;
1154                 break;
1155         default:
1156                 SCTPDBG(SCTP_DEBUG_INPUT2,
1157                     "Peer does not support param type %d(%x)??\n",
1158                     pbad->param_type, (uint32_t)pbad->param_type);
1159                 break;
1160         }
1161 }
1162
1163 static int
1164 sctp_handle_error(struct sctp_chunkhdr *ch,
1165     struct sctp_tcb *stcb, struct sctp_nets *net)
1166 {
1167         int chklen;
1168         struct sctp_paramhdr *phdr;
1169         uint16_t error, error_type;
1170         uint16_t error_len;
1171         struct sctp_association *asoc;
1172         int adjust;
1173 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1174         struct socket *so;
1175 #endif
1176
1177         /* parse through all of the errors and process */
1178         asoc = &stcb->asoc;
1179         phdr = (struct sctp_paramhdr *)((caddr_t)ch +
1180             sizeof(struct sctp_chunkhdr));
1181         chklen = ntohs(ch->chunk_length) - sizeof(struct sctp_chunkhdr);
1182         error = 0;
1183         while ((size_t)chklen >= sizeof(struct sctp_paramhdr)) {
1184                 /* Process an Error Cause */
1185                 error_type = ntohs(phdr->param_type);
1186                 error_len = ntohs(phdr->param_length);
1187                 if ((error_len > chklen) || (error_len == 0)) {
1188                         /* invalid param length for this param */
1189                         SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in error param- chunk left:%d errorlen:%d\n",
1190                             chklen, error_len);
1191                         return (0);
1192                 }
1193                 if (error == 0) {
1194                         /* report the first error cause */
1195                         error = error_type;
1196                 }
1197                 switch (error_type) {
1198                 case SCTP_CAUSE_INVALID_STREAM:
1199                 case SCTP_CAUSE_MISSING_PARAM:
1200                 case SCTP_CAUSE_INVALID_PARAM:
1201                 case SCTP_CAUSE_NO_USER_DATA:
1202                         SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %d back? We have a bug :/ (or do they?)\n",
1203                             error_type);
1204                         break;
1205                 case SCTP_CAUSE_NAT_COLLIDING_STATE:
1206                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n",
1207                             ch->chunk_flags);
1208                         if (sctp_handle_nat_colliding_state(stcb)) {
1209                                 return (0);
1210                         }
1211                         break;
1212                 case SCTP_CAUSE_NAT_MISSING_STATE:
1213                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n",
1214                             ch->chunk_flags);
1215                         if (sctp_handle_nat_missing_state(stcb, net)) {
1216                                 return (0);
1217                         }
1218                         break;
1219                 case SCTP_CAUSE_STALE_COOKIE:
1220                         /*
1221                          * We only act if we have echoed a cookie and are
1222                          * waiting.
1223                          */
1224                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) {
1225                                 int *p;
1226
1227                                 p = (int *)((caddr_t)phdr + sizeof(*phdr));
1228                                 /* Save the time doubled */
1229                                 asoc->cookie_preserve_req = ntohl(*p) << 1;
1230                                 asoc->stale_cookie_count++;
1231                                 if (asoc->stale_cookie_count >
1232                                     asoc->max_init_times) {
1233                                         sctp_abort_notification(stcb, 0, 0, NULL, SCTP_SO_NOT_LOCKED);
1234                                         /* now free the asoc */
1235 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1236                                         so = SCTP_INP_SO(stcb->sctp_ep);
1237                                         atomic_add_int(&stcb->asoc.refcnt, 1);
1238                                         SCTP_TCB_UNLOCK(stcb);
1239                                         SCTP_SOCKET_LOCK(so, 1);
1240                                         SCTP_TCB_LOCK(stcb);
1241                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
1242 #endif
1243                                         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1244                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_12);
1245 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1246                                         SCTP_SOCKET_UNLOCK(so, 1);
1247 #endif
1248                                         return (-1);
1249                                 }
1250                                 /* blast back to INIT state */
1251                                 sctp_toss_old_cookies(stcb, &stcb->asoc);
1252                                 asoc->state &= ~SCTP_STATE_COOKIE_ECHOED;
1253                                 asoc->state |= SCTP_STATE_COOKIE_WAIT;
1254                                 sctp_stop_all_cookie_timers(stcb);
1255                                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
1256                         }
1257                         break;
1258                 case SCTP_CAUSE_UNRESOLVABLE_ADDR:
1259                         /*
1260                          * Nothing we can do here, we don't do hostname
1261                          * addresses so if the peer does not like my IPv6
1262                          * (or IPv4 for that matter) it does not matter. If
1263                          * they don't support that type of address, they can
1264                          * NOT possibly get that packet type... i.e. with no
1265                          * IPv6 you can't receive a IPv6 packet. so we can
1266                          * safely ignore this one. If we ever added support
1267                          * for HOSTNAME Addresses, then we would need to do
1268                          * something here.
1269                          */
1270                         break;
1271                 case SCTP_CAUSE_UNRECOG_CHUNK:
1272                         sctp_process_unrecog_chunk(stcb, phdr, net);
1273                         break;
1274                 case SCTP_CAUSE_UNRECOG_PARAM:
1275                         sctp_process_unrecog_param(stcb, phdr);
1276                         break;
1277                 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN:
1278                         /*
1279                          * We ignore this since the timer will drive out a
1280                          * new cookie anyway and there timer will drive us
1281                          * to send a SHUTDOWN_COMPLETE. We can't send one
1282                          * here since we don't have their tag.
1283                          */
1284                         break;
1285                 case SCTP_CAUSE_DELETING_LAST_ADDR:
1286                 case SCTP_CAUSE_RESOURCE_SHORTAGE:
1287                 case SCTP_CAUSE_DELETING_SRC_ADDR:
1288                         /*
1289                          * We should NOT get these here, but in a
1290                          * ASCONF-ACK.
1291                          */
1292                         SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a Operational Error?<%d>?\n",
1293                             error_type);
1294                         break;
1295                 case SCTP_CAUSE_OUT_OF_RESC:
1296                         /*
1297                          * And what, pray tell do we do with the fact that
1298                          * the peer is out of resources? Not really sure we
1299                          * could do anything but abort. I suspect this
1300                          * should have came WITH an abort instead of in a
1301                          * OP-ERROR.
1302                          */
1303                         break;
1304                 default:
1305                         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown error type = 0x%xh\n",
1306                             error_type);
1307                         break;
1308                 }
1309                 adjust = SCTP_SIZE32(error_len);
1310                 chklen -= adjust;
1311                 phdr = (struct sctp_paramhdr *)((caddr_t)phdr + adjust);
1312         }
1313         sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, error, ch, SCTP_SO_NOT_LOCKED);
1314         return (0);
1315 }
1316
1317 static int
1318 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset,
1319     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
1320     struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
1321     struct sctp_nets *net, int *abort_no_unlock,
1322     uint8_t mflowtype, uint32_t mflowid,
1323     uint32_t vrf_id)
1324 {
1325         struct sctp_init_ack *init_ack;
1326         struct mbuf *op_err;
1327
1328         SCTPDBG(SCTP_DEBUG_INPUT2,
1329             "sctp_handle_init_ack: handling INIT-ACK\n");
1330
1331         if (stcb == NULL) {
1332                 SCTPDBG(SCTP_DEBUG_INPUT2,
1333                     "sctp_handle_init_ack: TCB is null\n");
1334                 return (-1);
1335         }
1336         if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) {
1337                 /* Invalid length */
1338                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1339                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1340                     src, dst, sh, op_err,
1341                     mflowtype, mflowid,
1342                     vrf_id, net->port);
1343                 *abort_no_unlock = 1;
1344                 return (-1);
1345         }
1346         init_ack = &cp->init;
1347         /* validate parameters */
1348         if (init_ack->initiate_tag == 0) {
1349                 /* protocol error... send an abort */
1350                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1351                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1352                     src, dst, sh, op_err,
1353                     mflowtype, mflowid,
1354                     vrf_id, net->port);
1355                 *abort_no_unlock = 1;
1356                 return (-1);
1357         }
1358         if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) {
1359                 /* protocol error... send an abort */
1360                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1361                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1362                     src, dst, sh, op_err,
1363                     mflowtype, mflowid,
1364                     vrf_id, net->port);
1365                 *abort_no_unlock = 1;
1366                 return (-1);
1367         }
1368         if (init_ack->num_inbound_streams == 0) {
1369                 /* protocol error... send an abort */
1370                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1371                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1372                     src, dst, sh, op_err,
1373                     mflowtype, mflowid,
1374                     vrf_id, net->port);
1375                 *abort_no_unlock = 1;
1376                 return (-1);
1377         }
1378         if (init_ack->num_outbound_streams == 0) {
1379                 /* protocol error... send an abort */
1380                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1381                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1382                     src, dst, sh, op_err,
1383                     mflowtype, mflowid,
1384                     vrf_id, net->port);
1385                 *abort_no_unlock = 1;
1386                 return (-1);
1387         }
1388         /* process according to association state... */
1389         switch (stcb->asoc.state & SCTP_STATE_MASK) {
1390         case SCTP_STATE_COOKIE_WAIT:
1391                 /* this is the expected state for this chunk */
1392                 /* process the INIT-ACK parameters */
1393                 if (stcb->asoc.primary_destination->dest_state &
1394                     SCTP_ADDR_UNCONFIRMED) {
1395                         /*
1396                          * The primary is where we sent the INIT, we can
1397                          * always consider it confirmed when the INIT-ACK is
1398                          * returned. Do this before we load addresses
1399                          * though.
1400                          */
1401                         stcb->asoc.primary_destination->dest_state &=
1402                             ~SCTP_ADDR_UNCONFIRMED;
1403                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
1404                             stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED);
1405                 }
1406                 if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb,
1407                     net, abort_no_unlock,
1408                     mflowtype, mflowid,
1409                     vrf_id) < 0) {
1410                         /* error in parsing parameters */
1411                         return (-1);
1412                 }
1413                 /* update our state */
1414                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n");
1415                 SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_ECHOED);
1416
1417                 /* reset the RTO calc */
1418                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
1419                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
1420                             stcb->asoc.overall_error_count,
1421                             0,
1422                             SCTP_FROM_SCTP_INPUT,
1423                             __LINE__);
1424                 }
1425                 stcb->asoc.overall_error_count = 0;
1426                 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
1427                 /*
1428                  * collapse the init timer back in case of a exponential
1429                  * backoff
1430                  */
1431                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep,
1432                     stcb, net);
1433                 /*
1434                  * the send at the end of the inbound data processing will
1435                  * cause the cookie to be sent
1436                  */
1437                 break;
1438         case SCTP_STATE_SHUTDOWN_SENT:
1439                 /* incorrect state... discard */
1440                 break;
1441         case SCTP_STATE_COOKIE_ECHOED:
1442                 /* incorrect state... discard */
1443                 break;
1444         case SCTP_STATE_OPEN:
1445                 /* incorrect state... discard */
1446                 break;
1447         case SCTP_STATE_EMPTY:
1448         case SCTP_STATE_INUSE:
1449         default:
1450                 /* incorrect state... discard */
1451                 return (-1);
1452                 break;
1453         }
1454         SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n");
1455         return (0);
1456 }
1457
1458 static struct sctp_tcb *
1459 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
1460     struct sockaddr *src, struct sockaddr *dst,
1461     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1462     struct sctp_inpcb *inp, struct sctp_nets **netp,
1463     struct sockaddr *init_src, int *notification,
1464     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1465     uint8_t mflowtype, uint32_t mflowid,
1466     uint32_t vrf_id, uint16_t port);
1467
1468
1469 /*
1470  * handle a state cookie for an existing association m: input packet mbuf
1471  * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a
1472  * "split" mbuf and the cookie signature does not exist offset: offset into
1473  * mbuf to the cookie-echo chunk
1474  */
1475 static struct sctp_tcb *
1476 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset,
1477     struct sockaddr *src, struct sockaddr *dst,
1478     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1479     struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp,
1480     struct sockaddr *init_src, int *notification,
1481     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1482     uint8_t mflowtype, uint32_t mflowid,
1483     uint32_t vrf_id, uint16_t port)
1484 {
1485         struct sctp_association *asoc;
1486         struct sctp_init_chunk *init_cp, init_buf;
1487         struct sctp_init_ack_chunk *initack_cp, initack_buf;
1488         struct sctp_nets *net;
1489         struct mbuf *op_err;
1490         struct timeval old;
1491         int init_offset, initack_offset, i;
1492         int retval;
1493         int spec_flag = 0;
1494         uint32_t how_indx;
1495 #if defined(SCTP_DETAILED_STR_STATS)
1496         int j;
1497 #endif
1498
1499         net = *netp;
1500         /* I know that the TCB is non-NULL from the caller */
1501         asoc = &stcb->asoc;
1502         for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) {
1503                 if (asoc->cookie_how[how_indx] == 0)
1504                         break;
1505         }
1506         if (how_indx < sizeof(asoc->cookie_how)) {
1507                 asoc->cookie_how[how_indx] = 1;
1508         }
1509         if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
1510                 /* SHUTDOWN came in after sending INIT-ACK */
1511                 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination);
1512                 op_err = sctp_generate_cause(SCTP_CAUSE_COOKIE_IN_SHUTDOWN, "");
1513                 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
1514                     mflowtype, mflowid, inp->fibnum,
1515                     vrf_id, net->port);
1516                 if (how_indx < sizeof(asoc->cookie_how))
1517                         asoc->cookie_how[how_indx] = 2;
1518                 return (NULL);
1519         }
1520         /*
1521          * find and validate the INIT chunk in the cookie (peer's info) the
1522          * INIT should start after the cookie-echo header struct (chunk
1523          * header, state cookie header struct)
1524          */
1525         init_offset = offset += sizeof(struct sctp_cookie_echo_chunk);
1526
1527         init_cp = (struct sctp_init_chunk *)
1528             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
1529             (uint8_t *)&init_buf);
1530         if (init_cp == NULL) {
1531                 /* could not pull a INIT chunk in cookie */
1532                 return (NULL);
1533         }
1534         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
1535                 return (NULL);
1536         }
1537         /*
1538          * find and validate the INIT-ACK chunk in the cookie (my info) the
1539          * INIT-ACK follows the INIT chunk
1540          */
1541         initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
1542         initack_cp = (struct sctp_init_ack_chunk *)
1543             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
1544             (uint8_t *)&initack_buf);
1545         if (initack_cp == NULL) {
1546                 /* could not pull INIT-ACK chunk in cookie */
1547                 return (NULL);
1548         }
1549         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
1550                 return (NULL);
1551         }
1552         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1553             (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) {
1554                 /*
1555                  * case D in Section 5.2.4 Table 2: MMAA process accordingly
1556                  * to get into the OPEN state
1557                  */
1558                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1559                         /*-
1560                          * Opps, this means that we somehow generated two vtag's
1561                          * the same. I.e. we did:
1562                          *  Us               Peer
1563                          *   <---INIT(tag=a)------
1564                          *   ----INIT-ACK(tag=t)-->
1565                          *   ----INIT(tag=t)------> *1
1566                          *   <---INIT-ACK(tag=a)---
1567                          *   <----CE(tag=t)------------- *2
1568                          *
1569                          * At point *1 we should be generating a different
1570                          * tag t'. Which means we would throw away the CE and send
1571                          * ours instead. Basically this is case C (throw away side).
1572                          */
1573                         if (how_indx < sizeof(asoc->cookie_how))
1574                                 asoc->cookie_how[how_indx] = 17;
1575                         return (NULL);
1576
1577                 }
1578                 switch (SCTP_GET_STATE(asoc)) {
1579                 case SCTP_STATE_COOKIE_WAIT:
1580                 case SCTP_STATE_COOKIE_ECHOED:
1581                         /*
1582                          * INIT was sent but got a COOKIE_ECHO with the
1583                          * correct tags... just accept it...but we must
1584                          * process the init so that we can make sure we have
1585                          * the right seq no's.
1586                          */
1587                         /* First we must process the INIT !! */
1588                         retval = sctp_process_init(init_cp, stcb);
1589                         if (retval < 0) {
1590                                 if (how_indx < sizeof(asoc->cookie_how))
1591                                         asoc->cookie_how[how_indx] = 3;
1592                                 return (NULL);
1593                         }
1594                         /* we have already processed the INIT so no problem */
1595                         sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp,
1596                             stcb, net,
1597                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_13);
1598                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp,
1599                             stcb, net,
1600                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_14);
1601                         /* update current state */
1602                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)
1603                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1604                         else
1605                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1606
1607                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1608                         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1609                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1610                                     stcb->sctp_ep, stcb, asoc->primary_destination);
1611                         }
1612                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1613                         sctp_stop_all_cookie_timers(stcb);
1614                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1615                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1616                             (!SCTP_IS_LISTENING(inp))) {
1617 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1618                                 struct socket *so;
1619 #endif
1620                                 /*
1621                                  * Here is where collision would go if we
1622                                  * did a connect() and instead got a
1623                                  * init/init-ack/cookie done before the
1624                                  * init-ack came back..
1625                                  */
1626                                 stcb->sctp_ep->sctp_flags |=
1627                                     SCTP_PCB_FLAGS_CONNECTED;
1628 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1629                                 so = SCTP_INP_SO(stcb->sctp_ep);
1630                                 atomic_add_int(&stcb->asoc.refcnt, 1);
1631                                 SCTP_TCB_UNLOCK(stcb);
1632                                 SCTP_SOCKET_LOCK(so, 1);
1633                                 SCTP_TCB_LOCK(stcb);
1634                                 atomic_add_int(&stcb->asoc.refcnt, -1);
1635                                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1636                                         SCTP_SOCKET_UNLOCK(so, 1);
1637                                         return (NULL);
1638                                 }
1639 #endif
1640                                 soisconnected(stcb->sctp_socket);
1641 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1642                                 SCTP_SOCKET_UNLOCK(so, 1);
1643 #endif
1644                         }
1645                         /* notify upper layer */
1646                         *notification = SCTP_NOTIFY_ASSOC_UP;
1647                         /*
1648                          * since we did not send a HB make sure we don't
1649                          * double things
1650                          */
1651                         old.tv_sec = cookie->time_entered.tv_sec;
1652                         old.tv_usec = cookie->time_entered.tv_usec;
1653                         net->hb_responded = 1;
1654                         net->RTO = sctp_calculate_rto(stcb, asoc, net,
1655                             &old,
1656                             SCTP_RTT_FROM_NON_DATA);
1657
1658                         if (stcb->asoc.sctp_autoclose_ticks &&
1659                             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) {
1660                                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
1661                                     inp, stcb, NULL);
1662                         }
1663                         break;
1664                 default:
1665                         /*
1666                          * we're in the OPEN state (or beyond), so peer must
1667                          * have simply lost the COOKIE-ACK
1668                          */
1669                         break;
1670                 }               /* end switch */
1671                 sctp_stop_all_cookie_timers(stcb);
1672                 /*
1673                  * We ignore the return code here.. not sure if we should
1674                  * somehow abort.. but we do have an existing asoc. This
1675                  * really should not fail.
1676                  */
1677                 if (sctp_load_addresses_from_init(stcb, m,
1678                     init_offset + sizeof(struct sctp_init_chunk),
1679                     initack_offset, src, dst, init_src, stcb->asoc.port)) {
1680                         if (how_indx < sizeof(asoc->cookie_how))
1681                                 asoc->cookie_how[how_indx] = 4;
1682                         return (NULL);
1683                 }
1684                 /* respond with a COOKIE-ACK */
1685                 sctp_toss_old_cookies(stcb, asoc);
1686                 sctp_send_cookie_ack(stcb);
1687                 if (how_indx < sizeof(asoc->cookie_how))
1688                         asoc->cookie_how[how_indx] = 5;
1689                 return (stcb);
1690         }
1691         if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1692             ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag &&
1693             cookie->tie_tag_my_vtag == 0 &&
1694             cookie->tie_tag_peer_vtag == 0) {
1695                 /*
1696                  * case C in Section 5.2.4 Table 2: XMOO silently discard
1697                  */
1698                 if (how_indx < sizeof(asoc->cookie_how))
1699                         asoc->cookie_how[how_indx] = 6;
1700                 return (NULL);
1701         }
1702         /*
1703          * If nat support, and the below and stcb is established, send back
1704          * a ABORT(colliding state) if we are established.
1705          */
1706         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) &&
1707             (asoc->peer_supports_nat) &&
1708             ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1709             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1710             (asoc->peer_vtag == 0)))) {
1711                 /*
1712                  * Special case - Peer's support nat. We may have two init's
1713                  * that we gave out the same tag on since one was not
1714                  * established.. i.e. we get INIT from host-1 behind the nat
1715                  * and we respond tag-a, we get a INIT from host-2 behind
1716                  * the nat and we get tag-a again. Then we bring up host-1
1717                  * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1).
1718                  * Now we have colliding state. We must send an abort here
1719                  * with colliding state indication.
1720                  */
1721                 op_err = sctp_generate_cause(SCTP_CAUSE_NAT_COLLIDING_STATE, "");
1722                 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err,
1723                     mflowtype, mflowid, inp->fibnum,
1724                     vrf_id, port);
1725                 return (NULL);
1726         }
1727         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1728             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1729             (asoc->peer_vtag == 0))) {
1730                 /*
1731                  * case B in Section 5.2.4 Table 2: MXAA or MOAA my info
1732                  * should be ok, re-accept peer info
1733                  */
1734                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1735                         /*
1736                          * Extension of case C. If we hit this, then the
1737                          * random number generator returned the same vtag
1738                          * when we first sent our INIT-ACK and when we later
1739                          * sent our INIT. The side with the seq numbers that
1740                          * are different will be the one that normnally
1741                          * would have hit case C. This in effect "extends"
1742                          * our vtags in this collision case to be 64 bits.
1743                          * The same collision could occur aka you get both
1744                          * vtag and seq number the same twice in a row.. but
1745                          * is much less likely. If it did happen then we
1746                          * would proceed through and bring up the assoc.. we
1747                          * may end up with the wrong stream setup however..
1748                          * which would be bad.. but there is no way to
1749                          * tell.. until we send on a stream that does not
1750                          * exist :-)
1751                          */
1752                         if (how_indx < sizeof(asoc->cookie_how))
1753                                 asoc->cookie_how[how_indx] = 7;
1754
1755                         return (NULL);
1756                 }
1757                 if (how_indx < sizeof(asoc->cookie_how))
1758                         asoc->cookie_how[how_indx] = 8;
1759                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net,
1760                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_15);
1761                 sctp_stop_all_cookie_timers(stcb);
1762                 /*
1763                  * since we did not send a HB make sure we don't double
1764                  * things
1765                  */
1766                 net->hb_responded = 1;
1767                 if (stcb->asoc.sctp_autoclose_ticks &&
1768                     sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
1769                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb,
1770                             NULL);
1771                 }
1772                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1773                 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
1774
1775                 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) {
1776                         /*
1777                          * Ok the peer probably discarded our data (if we
1778                          * echoed a cookie+data). So anything on the
1779                          * sent_queue should be marked for retransmit, we
1780                          * may not get something to kick us so it COULD
1781                          * still take a timeout to move these.. but it can't
1782                          * hurt to mark them.
1783                          */
1784                         struct sctp_tmit_chunk *chk;
1785
1786                         TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
1787                                 if (chk->sent < SCTP_DATAGRAM_RESEND) {
1788                                         chk->sent = SCTP_DATAGRAM_RESEND;
1789                                         sctp_flight_size_decrease(chk);
1790                                         sctp_total_flight_decrease(stcb, chk);
1791                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1792                                         spec_flag++;
1793                                 }
1794                         }
1795
1796                 }
1797                 /* process the INIT info (peer's info) */
1798                 retval = sctp_process_init(init_cp, stcb);
1799                 if (retval < 0) {
1800                         if (how_indx < sizeof(asoc->cookie_how))
1801                                 asoc->cookie_how[how_indx] = 9;
1802                         return (NULL);
1803                 }
1804                 if (sctp_load_addresses_from_init(stcb, m,
1805                     init_offset + sizeof(struct sctp_init_chunk),
1806                     initack_offset, src, dst, init_src, stcb->asoc.port)) {
1807                         if (how_indx < sizeof(asoc->cookie_how))
1808                                 asoc->cookie_how[how_indx] = 10;
1809                         return (NULL);
1810                 }
1811                 if ((asoc->state & SCTP_STATE_COOKIE_WAIT) ||
1812                     (asoc->state & SCTP_STATE_COOKIE_ECHOED)) {
1813                         *notification = SCTP_NOTIFY_ASSOC_UP;
1814
1815                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1816                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1817                             (!SCTP_IS_LISTENING(inp))) {
1818 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1819                                 struct socket *so;
1820 #endif
1821                                 stcb->sctp_ep->sctp_flags |=
1822                                     SCTP_PCB_FLAGS_CONNECTED;
1823 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1824                                 so = SCTP_INP_SO(stcb->sctp_ep);
1825                                 atomic_add_int(&stcb->asoc.refcnt, 1);
1826                                 SCTP_TCB_UNLOCK(stcb);
1827                                 SCTP_SOCKET_LOCK(so, 1);
1828                                 SCTP_TCB_LOCK(stcb);
1829                                 atomic_add_int(&stcb->asoc.refcnt, -1);
1830                                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1831                                         SCTP_SOCKET_UNLOCK(so, 1);
1832                                         return (NULL);
1833                                 }
1834 #endif
1835                                 soisconnected(stcb->sctp_socket);
1836 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1837                                 SCTP_SOCKET_UNLOCK(so, 1);
1838 #endif
1839                         }
1840                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)
1841                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1842                         else
1843                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1844                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1845                 } else if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
1846                         SCTP_STAT_INCR_COUNTER32(sctps_restartestab);
1847                 } else {
1848                         SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1849                 }
1850                 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1851                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1852                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1853                             stcb->sctp_ep, stcb, asoc->primary_destination);
1854                 }
1855                 sctp_stop_all_cookie_timers(stcb);
1856                 sctp_toss_old_cookies(stcb, asoc);
1857                 sctp_send_cookie_ack(stcb);
1858                 if (spec_flag) {
1859                         /*
1860                          * only if we have retrans set do we do this. What
1861                          * this call does is get only the COOKIE-ACK out and
1862                          * then when we return the normal call to
1863                          * sctp_chunk_output will get the retrans out behind
1864                          * this.
1865                          */
1866                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED);
1867                 }
1868                 if (how_indx < sizeof(asoc->cookie_how))
1869                         asoc->cookie_how[how_indx] = 11;
1870
1871                 return (stcb);
1872         }
1873         if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1874             ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) &&
1875             cookie->tie_tag_my_vtag == asoc->my_vtag_nonce &&
1876             cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce &&
1877             cookie->tie_tag_peer_vtag != 0) {
1878                 struct sctpasochead *head;
1879 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1880                 struct socket *so;
1881 #endif
1882
1883                 if (asoc->peer_supports_nat) {
1884                         /*
1885                          * This is a gross gross hack. Just call the
1886                          * cookie_new code since we are allowing a duplicate
1887                          * association. I hope this works...
1888                          */
1889                         return (sctp_process_cookie_new(m, iphlen, offset, src, dst,
1890                             sh, cookie, cookie_len,
1891                             inp, netp, init_src, notification,
1892                             auth_skipped, auth_offset, auth_len,
1893                             mflowtype, mflowid,
1894                             vrf_id, port));
1895                 }
1896                 /*
1897                  * case A in Section 5.2.4 Table 2: XXMM (peer restarted)
1898                  */
1899                 /* temp code */
1900                 if (how_indx < sizeof(asoc->cookie_how))
1901                         asoc->cookie_how[how_indx] = 12;
1902                 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net,
1903                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
1904                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net,
1905                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_17);
1906
1907                 /* notify upper layer */
1908                 *notification = SCTP_NOTIFY_ASSOC_RESTART;
1909                 atomic_add_int(&stcb->asoc.refcnt, 1);
1910                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_OPEN) &&
1911                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
1912                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) {
1913                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1914                 }
1915                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
1916                         SCTP_STAT_INCR_GAUGE32(sctps_restartestab);
1917                 } else if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) {
1918                         SCTP_STAT_INCR_GAUGE32(sctps_collisionestab);
1919                 }
1920                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1921                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1922                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1923                             stcb->sctp_ep, stcb, asoc->primary_destination);
1924
1925                 } else if (!(asoc->state & SCTP_STATE_SHUTDOWN_SENT)) {
1926                         /* move to OPEN state, if not in SHUTDOWN_SENT */
1927                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1928                 }
1929                 asoc->pre_open_streams =
1930                     ntohs(initack_cp->init.num_outbound_streams);
1931                 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
1932                 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
1933                 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
1934
1935                 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
1936
1937                 asoc->str_reset_seq_in = asoc->init_seq_number;
1938
1939                 asoc->advanced_peer_ack_point = asoc->last_acked_seq;
1940                 if (asoc->mapping_array) {
1941                         memset(asoc->mapping_array, 0,
1942                             asoc->mapping_array_size);
1943                 }
1944                 if (asoc->nr_mapping_array) {
1945                         memset(asoc->nr_mapping_array, 0,
1946                             asoc->mapping_array_size);
1947                 }
1948                 SCTP_TCB_UNLOCK(stcb);
1949 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1950                 so = SCTP_INP_SO(stcb->sctp_ep);
1951                 SCTP_SOCKET_LOCK(so, 1);
1952 #endif
1953                 SCTP_INP_INFO_WLOCK();
1954                 SCTP_INP_WLOCK(stcb->sctp_ep);
1955                 SCTP_TCB_LOCK(stcb);
1956                 atomic_add_int(&stcb->asoc.refcnt, -1);
1957                 /* send up all the data */
1958                 SCTP_TCB_SEND_LOCK(stcb);
1959
1960                 sctp_report_all_outbound(stcb, 0, 1, SCTP_SO_LOCKED);
1961                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
1962                         stcb->asoc.strmout[i].chunks_on_queues = 0;
1963 #if defined(SCTP_DETAILED_STR_STATS)
1964                         for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
1965                                 asoc->strmout[i].abandoned_sent[j] = 0;
1966                                 asoc->strmout[i].abandoned_unsent[j] = 0;
1967                         }
1968 #else
1969                         asoc->strmout[i].abandoned_sent[0] = 0;
1970                         asoc->strmout[i].abandoned_unsent[0] = 0;
1971 #endif
1972                         stcb->asoc.strmout[i].sid = i;
1973                         stcb->asoc.strmout[i].next_mid_ordered = 0;
1974                         stcb->asoc.strmout[i].next_mid_unordered = 0;
1975                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
1976                 }
1977                 /* process the INIT-ACK info (my info) */
1978                 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
1979                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1980
1981                 /* pull from vtag hash */
1982                 LIST_REMOVE(stcb, sctp_asocs);
1983                 /* re-insert to new vtag position */
1984                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag,
1985                     SCTP_BASE_INFO(hashasocmark))];
1986                 /*
1987                  * put it in the bucket in the vtag hash of assoc's for the
1988                  * system
1989                  */
1990                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
1991
1992                 SCTP_TCB_SEND_UNLOCK(stcb);
1993                 SCTP_INP_WUNLOCK(stcb->sctp_ep);
1994                 SCTP_INP_INFO_WUNLOCK();
1995 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1996                 SCTP_SOCKET_UNLOCK(so, 1);
1997 #endif
1998                 asoc->total_flight = 0;
1999                 asoc->total_flight_count = 0;
2000                 /* process the INIT info (peer's info) */
2001                 retval = sctp_process_init(init_cp, stcb);
2002                 if (retval < 0) {
2003                         if (how_indx < sizeof(asoc->cookie_how))
2004                                 asoc->cookie_how[how_indx] = 13;
2005
2006                         return (NULL);
2007                 }
2008                 /*
2009                  * since we did not send a HB make sure we don't double
2010                  * things
2011                  */
2012                 net->hb_responded = 1;
2013
2014                 if (sctp_load_addresses_from_init(stcb, m,
2015                     init_offset + sizeof(struct sctp_init_chunk),
2016                     initack_offset, src, dst, init_src, stcb->asoc.port)) {
2017                         if (how_indx < sizeof(asoc->cookie_how))
2018                                 asoc->cookie_how[how_indx] = 14;
2019
2020                         return (NULL);
2021                 }
2022                 /* respond with a COOKIE-ACK */
2023                 sctp_stop_all_cookie_timers(stcb);
2024                 sctp_toss_old_cookies(stcb, asoc);
2025                 sctp_send_cookie_ack(stcb);
2026                 if (how_indx < sizeof(asoc->cookie_how))
2027                         asoc->cookie_how[how_indx] = 15;
2028
2029                 return (stcb);
2030         }
2031         if (how_indx < sizeof(asoc->cookie_how))
2032                 asoc->cookie_how[how_indx] = 16;
2033         /* all other cases... */
2034         return (NULL);
2035 }
2036
2037
2038 /*
2039  * handle a state cookie for a new association m: input packet mbuf chain--
2040  * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf
2041  * and the cookie signature does not exist offset: offset into mbuf to the
2042  * cookie-echo chunk length: length of the cookie chunk to: where the init
2043  * was from returns a new TCB
2044  */
2045 static struct sctp_tcb *
2046 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
2047     struct sockaddr *src, struct sockaddr *dst,
2048     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
2049     struct sctp_inpcb *inp, struct sctp_nets **netp,
2050     struct sockaddr *init_src, int *notification,
2051     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
2052     uint8_t mflowtype, uint32_t mflowid,
2053     uint32_t vrf_id, uint16_t port)
2054 {
2055         struct sctp_tcb *stcb;
2056         struct sctp_init_chunk *init_cp, init_buf;
2057         struct sctp_init_ack_chunk *initack_cp, initack_buf;
2058         union sctp_sockstore store;
2059         struct sctp_association *asoc;
2060         int init_offset, initack_offset, initack_limit;
2061         int retval;
2062         int error = 0;
2063         uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE];
2064 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2065         struct socket *so;
2066
2067         so = SCTP_INP_SO(inp);
2068 #endif
2069
2070         /*
2071          * find and validate the INIT chunk in the cookie (peer's info) the
2072          * INIT should start after the cookie-echo header struct (chunk
2073          * header, state cookie header struct)
2074          */
2075         init_offset = offset + sizeof(struct sctp_cookie_echo_chunk);
2076         init_cp = (struct sctp_init_chunk *)
2077             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
2078             (uint8_t *)&init_buf);
2079         if (init_cp == NULL) {
2080                 /* could not pull a INIT chunk in cookie */
2081                 SCTPDBG(SCTP_DEBUG_INPUT1,
2082                     "process_cookie_new: could not pull INIT chunk hdr\n");
2083                 return (NULL);
2084         }
2085         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
2086                 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n");
2087                 return (NULL);
2088         }
2089         initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
2090         /*
2091          * find and validate the INIT-ACK chunk in the cookie (my info) the
2092          * INIT-ACK follows the INIT chunk
2093          */
2094         initack_cp = (struct sctp_init_ack_chunk *)
2095             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
2096             (uint8_t *)&initack_buf);
2097         if (initack_cp == NULL) {
2098                 /* could not pull INIT-ACK chunk in cookie */
2099                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n");
2100                 return (NULL);
2101         }
2102         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
2103                 return (NULL);
2104         }
2105         /*
2106          * NOTE: We can't use the INIT_ACK's chk_length to determine the
2107          * "initack_limit" value.  This is because the chk_length field
2108          * includes the length of the cookie, but the cookie is omitted when
2109          * the INIT and INIT_ACK are tacked onto the cookie...
2110          */
2111         initack_limit = offset + cookie_len;
2112
2113         /*
2114          * now that we know the INIT/INIT-ACK are in place, create a new TCB
2115          * and popluate
2116          */
2117
2118         /*
2119          * Here we do a trick, we set in NULL for the proc/thread argument.
2120          * We do this since in effect we only use the p argument when the
2121          * socket is unbound and we must do an implicit bind. Since we are
2122          * getting a cookie, we cannot be unbound.
2123          */
2124         stcb = sctp_aloc_assoc(inp, init_src, &error,
2125             ntohl(initack_cp->init.initiate_tag), vrf_id,
2126             ntohs(initack_cp->init.num_outbound_streams),
2127             port,
2128             (struct thread *)NULL
2129             );
2130         if (stcb == NULL) {
2131                 struct mbuf *op_err;
2132
2133                 /* memory problem? */
2134                 SCTPDBG(SCTP_DEBUG_INPUT1,
2135                     "process_cookie_new: no room for another TCB!\n");
2136                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2137                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2138                     src, dst, sh, op_err,
2139                     mflowtype, mflowid,
2140                     vrf_id, port);
2141                 return (NULL);
2142         }
2143         /* get the correct sctp_nets */
2144         if (netp)
2145                 *netp = sctp_findnet(stcb, init_src);
2146
2147         asoc = &stcb->asoc;
2148         /* get scope variables out of cookie */
2149         asoc->scope.ipv4_local_scope = cookie->ipv4_scope;
2150         asoc->scope.site_scope = cookie->site_scope;
2151         asoc->scope.local_scope = cookie->local_scope;
2152         asoc->scope.loopback_scope = cookie->loopback_scope;
2153
2154         if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) ||
2155             (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) {
2156                 struct mbuf *op_err;
2157
2158                 /*
2159                  * Houston we have a problem. The EP changed while the
2160                  * cookie was in flight. Only recourse is to abort the
2161                  * association.
2162                  */
2163                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2164                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2165                     src, dst, sh, op_err,
2166                     mflowtype, mflowid,
2167                     vrf_id, port);
2168 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2169                 atomic_add_int(&stcb->asoc.refcnt, 1);
2170                 SCTP_TCB_UNLOCK(stcb);
2171                 SCTP_SOCKET_LOCK(so, 1);
2172                 SCTP_TCB_LOCK(stcb);
2173                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2174 #endif
2175                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2176                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_18);
2177 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2178                 SCTP_SOCKET_UNLOCK(so, 1);
2179 #endif
2180                 return (NULL);
2181         }
2182         /* process the INIT-ACK info (my info) */
2183         asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
2184         asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
2185         asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
2186         asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
2187         asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
2188         asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
2189         asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
2190         asoc->str_reset_seq_in = asoc->init_seq_number;
2191
2192         asoc->advanced_peer_ack_point = asoc->last_acked_seq;
2193
2194         /* process the INIT info (peer's info) */
2195         if (netp)
2196                 retval = sctp_process_init(init_cp, stcb);
2197         else
2198                 retval = 0;
2199         if (retval < 0) {
2200 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2201                 atomic_add_int(&stcb->asoc.refcnt, 1);
2202                 SCTP_TCB_UNLOCK(stcb);
2203                 SCTP_SOCKET_LOCK(so, 1);
2204                 SCTP_TCB_LOCK(stcb);
2205                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2206 #endif
2207                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2208                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_19);
2209 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2210                 SCTP_SOCKET_UNLOCK(so, 1);
2211 #endif
2212                 return (NULL);
2213         }
2214         /* load all addresses */
2215         if (sctp_load_addresses_from_init(stcb, m,
2216             init_offset + sizeof(struct sctp_init_chunk), initack_offset,
2217             src, dst, init_src, port)) {
2218 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2219                 atomic_add_int(&stcb->asoc.refcnt, 1);
2220                 SCTP_TCB_UNLOCK(stcb);
2221                 SCTP_SOCKET_LOCK(so, 1);
2222                 SCTP_TCB_LOCK(stcb);
2223                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2224 #endif
2225                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2226                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_20);
2227 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2228                 SCTP_SOCKET_UNLOCK(so, 1);
2229 #endif
2230                 return (NULL);
2231         }
2232         /*
2233          * verify any preceding AUTH chunk that was skipped
2234          */
2235         /* pull the local authentication parameters from the cookie/init-ack */
2236         sctp_auth_get_cookie_params(stcb, m,
2237             initack_offset + sizeof(struct sctp_init_ack_chunk),
2238             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)));
2239         if (auth_skipped) {
2240                 struct sctp_auth_chunk *auth;
2241
2242                 auth = (struct sctp_auth_chunk *)
2243                     sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf);
2244                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) {
2245                         /* auth HMAC failed, dump the assoc and packet */
2246                         SCTPDBG(SCTP_DEBUG_AUTH1,
2247                             "COOKIE-ECHO: AUTH failed\n");
2248 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2249                         atomic_add_int(&stcb->asoc.refcnt, 1);
2250                         SCTP_TCB_UNLOCK(stcb);
2251                         SCTP_SOCKET_LOCK(so, 1);
2252                         SCTP_TCB_LOCK(stcb);
2253                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
2254 #endif
2255                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2256                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_21);
2257 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2258                         SCTP_SOCKET_UNLOCK(so, 1);
2259 #endif
2260                         return (NULL);
2261                 } else {
2262                         /* remaining chunks checked... good to go */
2263                         stcb->asoc.authenticated = 1;
2264                 }
2265         }
2266         /*
2267          * if we're doing ASCONFs, check to see if we have any new local
2268          * addresses that need to get added to the peer (eg. addresses
2269          * changed while cookie echo in flight).  This needs to be done
2270          * after we go to the OPEN state to do the correct asconf
2271          * processing. else, make sure we have the correct addresses in our
2272          * lists
2273          */
2274
2275         /* warning, we re-use sin, sin6, sa_store here! */
2276         /* pull in local_address (our "from" address) */
2277         switch (cookie->laddr_type) {
2278 #ifdef INET
2279         case SCTP_IPV4_ADDRESS:
2280                 /* source addr is IPv4 */
2281                 memset(&store.sin, 0, sizeof(struct sockaddr_in));
2282                 store.sin.sin_family = AF_INET;
2283                 store.sin.sin_len = sizeof(struct sockaddr_in);
2284                 store.sin.sin_addr.s_addr = cookie->laddress[0];
2285                 break;
2286 #endif
2287 #ifdef INET6
2288         case SCTP_IPV6_ADDRESS:
2289                 /* source addr is IPv6 */
2290                 memset(&store.sin6, 0, sizeof(struct sockaddr_in6));
2291                 store.sin6.sin6_family = AF_INET6;
2292                 store.sin6.sin6_len = sizeof(struct sockaddr_in6);
2293                 store.sin6.sin6_scope_id = cookie->scope_id;
2294                 memcpy(&store.sin6.sin6_addr, cookie->laddress, sizeof(struct in6_addr));
2295                 break;
2296 #endif
2297         default:
2298 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2299                 atomic_add_int(&stcb->asoc.refcnt, 1);
2300                 SCTP_TCB_UNLOCK(stcb);
2301                 SCTP_SOCKET_LOCK(so, 1);
2302                 SCTP_TCB_LOCK(stcb);
2303                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2304 #endif
2305                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2306                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_22);
2307 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2308                 SCTP_SOCKET_UNLOCK(so, 1);
2309 #endif
2310                 return (NULL);
2311         }
2312
2313         /* update current state */
2314         SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2315         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
2316         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2317                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2318                     stcb->sctp_ep, stcb, asoc->primary_destination);
2319         }
2320         sctp_stop_all_cookie_timers(stcb);
2321         SCTP_STAT_INCR_COUNTER32(sctps_passiveestab);
2322         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2323
2324         /* set up to notify upper layer */
2325         *notification = SCTP_NOTIFY_ASSOC_UP;
2326         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2327             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
2328             (!SCTP_IS_LISTENING(inp))) {
2329                 /*
2330                  * This is an endpoint that called connect() how it got a
2331                  * cookie that is NEW is a bit of a mystery. It must be that
2332                  * the INIT was sent, but before it got there.. a complete
2333                  * INIT/INIT-ACK/COOKIE arrived. But of course then it
2334                  * should have went to the other code.. not here.. oh well..
2335                  * a bit of protection is worth having..
2336                  */
2337                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2338 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2339                 atomic_add_int(&stcb->asoc.refcnt, 1);
2340                 SCTP_TCB_UNLOCK(stcb);
2341                 SCTP_SOCKET_LOCK(so, 1);
2342                 SCTP_TCB_LOCK(stcb);
2343                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2344                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
2345                         SCTP_SOCKET_UNLOCK(so, 1);
2346                         return (NULL);
2347                 }
2348 #endif
2349                 soisconnected(stcb->sctp_socket);
2350 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2351                 SCTP_SOCKET_UNLOCK(so, 1);
2352 #endif
2353         } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
2354             (SCTP_IS_LISTENING(inp))) {
2355                 /*
2356                  * We don't want to do anything with this one. Since it is
2357                  * the listening guy. The timer will get started for
2358                  * accepted connections in the caller.
2359                  */
2360                 ;
2361         }
2362         /* since we did not send a HB make sure we don't double things */
2363         if ((netp) && (*netp))
2364                 (*netp)->hb_responded = 1;
2365
2366         if (stcb->asoc.sctp_autoclose_ticks &&
2367             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2368                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL);
2369         }
2370         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
2371         if ((netp != NULL) && (*netp != NULL)) {
2372                 struct timeval old;
2373
2374                 /* calculate the RTT and set the encaps port */
2375                 old.tv_sec = cookie->time_entered.tv_sec;
2376                 old.tv_usec = cookie->time_entered.tv_usec;
2377                 (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp,
2378                     &old, SCTP_RTT_FROM_NON_DATA);
2379         }
2380         /* respond with a COOKIE-ACK */
2381         sctp_send_cookie_ack(stcb);
2382
2383         /*
2384          * check the address lists for any ASCONFs that need to be sent
2385          * AFTER the cookie-ack is sent
2386          */
2387         sctp_check_address_list(stcb, m,
2388             initack_offset + sizeof(struct sctp_init_ack_chunk),
2389             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)),
2390             &store.sa, cookie->local_scope, cookie->site_scope,
2391             cookie->ipv4_scope, cookie->loopback_scope);
2392
2393
2394         return (stcb);
2395 }
2396
2397 /*
2398  * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e
2399  * we NEED to make sure we are not already using the vtag. If so we
2400  * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit!
2401         head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag,
2402                                                             SCTP_BASE_INFO(hashasocmark))];
2403         LIST_FOREACH(stcb, head, sctp_asocs) {
2404                 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep))  {
2405                        -- SEND ABORT - TRY AGAIN --
2406                 }
2407         }
2408 */
2409
2410 /*
2411  * handles a COOKIE-ECHO message stcb: modified to either a new or left as
2412  * existing (non-NULL) TCB
2413  */
2414 static struct mbuf *
2415 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset,
2416     struct sockaddr *src, struct sockaddr *dst,
2417     struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp,
2418     struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp,
2419     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
2420     struct sctp_tcb **locked_tcb,
2421     uint8_t mflowtype, uint32_t mflowid,
2422     uint32_t vrf_id, uint16_t port)
2423 {
2424         struct sctp_state_cookie *cookie;
2425         struct sctp_tcb *l_stcb = *stcb;
2426         struct sctp_inpcb *l_inp;
2427         struct sockaddr *to;
2428         struct sctp_pcb *ep;
2429         struct mbuf *m_sig;
2430         uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE];
2431         uint8_t *sig;
2432         uint8_t cookie_ok = 0;
2433         unsigned int sig_offset, cookie_offset;
2434         unsigned int cookie_len;
2435         struct timeval now;
2436         struct timeval time_expires;
2437         int notification = 0;
2438         struct sctp_nets *netl;
2439         int had_a_existing_tcb = 0;
2440         int send_int_conf = 0;
2441 #ifdef INET
2442         struct sockaddr_in sin;
2443 #endif
2444 #ifdef INET6
2445         struct sockaddr_in6 sin6;
2446 #endif
2447
2448         SCTPDBG(SCTP_DEBUG_INPUT2,
2449             "sctp_handle_cookie: handling COOKIE-ECHO\n");
2450
2451         if (inp_p == NULL) {
2452                 return (NULL);
2453         }
2454         cookie = &cp->cookie;
2455         cookie_offset = offset + sizeof(struct sctp_chunkhdr);
2456         cookie_len = ntohs(cp->ch.chunk_length);
2457
2458         if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) +
2459             sizeof(struct sctp_init_chunk) +
2460             sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) {
2461                 /* cookie too small */
2462                 return (NULL);
2463         }
2464         if ((cookie->peerport != sh->src_port) ||
2465             (cookie->myport != sh->dest_port) ||
2466             (cookie->my_vtag != sh->v_tag)) {
2467                 /*
2468                  * invalid ports or bad tag.  Note that we always leave the
2469                  * v_tag in the header in network order and when we stored
2470                  * it in the my_vtag slot we also left it in network order.
2471                  * This maintains the match even though it may be in the
2472                  * opposite byte order of the machine :->
2473                  */
2474                 return (NULL);
2475         }
2476         /*
2477          * split off the signature into its own mbuf (since it should not be
2478          * calculated in the sctp_hmac_m() call).
2479          */
2480         sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE;
2481         m_sig = m_split(m, sig_offset, M_NOWAIT);
2482         if (m_sig == NULL) {
2483                 /* out of memory or ?? */
2484                 return (NULL);
2485         }
2486 #ifdef SCTP_MBUF_LOGGING
2487         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
2488                 sctp_log_mbc(m_sig, SCTP_MBUF_SPLIT);
2489         }
2490 #endif
2491
2492         /*
2493          * compute the signature/digest for the cookie
2494          */
2495         ep = &(*inp_p)->sctp_ep;
2496         l_inp = *inp_p;
2497         if (l_stcb) {
2498                 SCTP_TCB_UNLOCK(l_stcb);
2499         }
2500         SCTP_INP_RLOCK(l_inp);
2501         if (l_stcb) {
2502                 SCTP_TCB_LOCK(l_stcb);
2503         }
2504         /* which cookie is it? */
2505         if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) &&
2506             (ep->current_secret_number != ep->last_secret_number)) {
2507                 /* it's the old cookie */
2508                 (void)sctp_hmac_m(SCTP_HMAC,
2509                     (uint8_t *)ep->secret_key[(int)ep->last_secret_number],
2510                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2511         } else {
2512                 /* it's the current cookie */
2513                 (void)sctp_hmac_m(SCTP_HMAC,
2514                     (uint8_t *)ep->secret_key[(int)ep->current_secret_number],
2515                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2516         }
2517         /* get the signature */
2518         SCTP_INP_RUNLOCK(l_inp);
2519         sig = (uint8_t *)sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *)&tmp_sig);
2520         if (sig == NULL) {
2521                 /* couldn't find signature */
2522                 sctp_m_freem(m_sig);
2523                 return (NULL);
2524         }
2525         /* compare the received digest with the computed digest */
2526         if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) {
2527                 /* try the old cookie? */
2528                 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) &&
2529                     (ep->current_secret_number != ep->last_secret_number)) {
2530                         /* compute digest with old */
2531                         (void)sctp_hmac_m(SCTP_HMAC,
2532                             (uint8_t *)ep->secret_key[(int)ep->last_secret_number],
2533                             SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2534                         /* compare */
2535                         if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0)
2536                                 cookie_ok = 1;
2537                 }
2538         } else {
2539                 cookie_ok = 1;
2540         }
2541
2542         /*
2543          * Now before we continue we must reconstruct our mbuf so that
2544          * normal processing of any other chunks will work.
2545          */
2546         {
2547                 struct mbuf *m_at;
2548
2549                 m_at = m;
2550                 while (SCTP_BUF_NEXT(m_at) != NULL) {
2551                         m_at = SCTP_BUF_NEXT(m_at);
2552                 }
2553                 SCTP_BUF_NEXT(m_at) = m_sig;
2554         }
2555
2556         if (cookie_ok == 0) {
2557                 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n");
2558                 SCTPDBG(SCTP_DEBUG_INPUT2,
2559                     "offset = %u, cookie_offset = %u, sig_offset = %u\n",
2560                     (uint32_t)offset, cookie_offset, sig_offset);
2561                 return (NULL);
2562         }
2563         /*
2564          * check the cookie timestamps to be sure it's not stale
2565          */
2566         (void)SCTP_GETTIME_TIMEVAL(&now);
2567         /* Expire time is in Ticks, so we convert to seconds */
2568         time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life);
2569         time_expires.tv_usec = cookie->time_entered.tv_usec;
2570         if (timevalcmp(&now, &time_expires, >)) {
2571                 /* cookie is stale! */
2572                 struct mbuf *op_err;
2573                 struct sctp_error_stale_cookie *cause;
2574                 struct timeval diff;
2575                 uint32_t staleness;
2576
2577                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_error_stale_cookie),
2578                     0, M_NOWAIT, 1, MT_DATA);
2579                 if (op_err == NULL) {
2580                         /* FOOBAR */
2581                         return (NULL);
2582                 }
2583                 /* Set the len */
2584                 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_error_stale_cookie);
2585                 cause = mtod(op_err, struct sctp_error_stale_cookie *);
2586                 cause->cause.code = htons(SCTP_CAUSE_STALE_COOKIE);
2587                 cause->cause.length = htons((sizeof(struct sctp_paramhdr) +
2588                     (sizeof(uint32_t))));
2589                 diff = now;
2590                 timevalsub(&diff, &time_expires);
2591                 if (diff.tv_sec > UINT32_MAX / 1000000) {
2592                         staleness = UINT32_MAX;
2593                 } else {
2594                         staleness = diff.tv_sec * 1000000;
2595                 }
2596                 if (UINT32_MAX - staleness >= (uint32_t)diff.tv_usec) {
2597                         staleness += diff.tv_usec;
2598                 } else {
2599                         staleness = UINT32_MAX;
2600                 }
2601                 cause->stale_time = htonl(staleness);
2602                 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
2603                     mflowtype, mflowid, l_inp->fibnum,
2604                     vrf_id, port);
2605                 return (NULL);
2606         }
2607         /*
2608          * Now we must see with the lookup address if we have an existing
2609          * asoc. This will only happen if we were in the COOKIE-WAIT state
2610          * and a INIT collided with us and somewhere the peer sent the
2611          * cookie on another address besides the single address our assoc
2612          * had for him. In this case we will have one of the tie-tags set at
2613          * least AND the address field in the cookie can be used to look it
2614          * up.
2615          */
2616         to = NULL;
2617         switch (cookie->addr_type) {
2618 #ifdef INET6
2619         case SCTP_IPV6_ADDRESS:
2620                 memset(&sin6, 0, sizeof(sin6));
2621                 sin6.sin6_family = AF_INET6;
2622                 sin6.sin6_len = sizeof(sin6);
2623                 sin6.sin6_port = sh->src_port;
2624                 sin6.sin6_scope_id = cookie->scope_id;
2625                 memcpy(&sin6.sin6_addr.s6_addr, cookie->address,
2626                     sizeof(sin6.sin6_addr.s6_addr));
2627                 to = (struct sockaddr *)&sin6;
2628                 break;
2629 #endif
2630 #ifdef INET
2631         case SCTP_IPV4_ADDRESS:
2632                 memset(&sin, 0, sizeof(sin));
2633                 sin.sin_family = AF_INET;
2634                 sin.sin_len = sizeof(sin);
2635                 sin.sin_port = sh->src_port;
2636                 sin.sin_addr.s_addr = cookie->address[0];
2637                 to = (struct sockaddr *)&sin;
2638                 break;
2639 #endif
2640         default:
2641                 /* This should not happen */
2642                 return (NULL);
2643         }
2644         if (*stcb == NULL) {
2645                 /* Yep, lets check */
2646                 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL);
2647                 if (*stcb == NULL) {
2648                         /*
2649                          * We should have only got back the same inp. If we
2650                          * got back a different ep we have a problem. The
2651                          * original findep got back l_inp and now
2652                          */
2653                         if (l_inp != *inp_p) {
2654                                 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n");
2655                         }
2656                 } else {
2657                         if (*locked_tcb == NULL) {
2658                                 /*
2659                                  * In this case we found the assoc only
2660                                  * after we locked the create lock. This
2661                                  * means we are in a colliding case and we
2662                                  * must make sure that we unlock the tcb if
2663                                  * its one of the cases where we throw away
2664                                  * the incoming packets.
2665                                  */
2666                                 *locked_tcb = *stcb;
2667
2668                                 /*
2669                                  * We must also increment the inp ref count
2670                                  * since the ref_count flags was set when we
2671                                  * did not find the TCB, now we found it
2672                                  * which reduces the refcount.. we must
2673                                  * raise it back out to balance it all :-)
2674                                  */
2675                                 SCTP_INP_INCR_REF((*stcb)->sctp_ep);
2676                                 if ((*stcb)->sctp_ep != l_inp) {
2677                                         SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n",
2678                                             (void *)(*stcb)->sctp_ep, (void *)l_inp);
2679                                 }
2680                         }
2681                 }
2682         }
2683         cookie_len -= SCTP_SIGNATURE_SIZE;
2684         if (*stcb == NULL) {
2685                 /* this is the "normal" case... get a new TCB */
2686                 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh,
2687                     cookie, cookie_len, *inp_p,
2688                     netp, to, &notification,
2689                     auth_skipped, auth_offset, auth_len,
2690                     mflowtype, mflowid,
2691                     vrf_id, port);
2692         } else {
2693                 /* this is abnormal... cookie-echo on existing TCB */
2694                 had_a_existing_tcb = 1;
2695                 *stcb = sctp_process_cookie_existing(m, iphlen, offset,
2696                     src, dst, sh,
2697                     cookie, cookie_len, *inp_p, *stcb, netp, to,
2698                     &notification, auth_skipped, auth_offset, auth_len,
2699                     mflowtype, mflowid,
2700                     vrf_id, port);
2701         }
2702
2703         if (*stcb == NULL) {
2704                 /* still no TCB... must be bad cookie-echo */
2705                 return (NULL);
2706         }
2707         if (*netp != NULL) {
2708                 (*netp)->flowtype = mflowtype;
2709                 (*netp)->flowid = mflowid;
2710         }
2711         /*
2712          * Ok, we built an association so confirm the address we sent the
2713          * INIT-ACK to.
2714          */
2715         netl = sctp_findnet(*stcb, to);
2716         /*
2717          * This code should in theory NOT run but
2718          */
2719         if (netl == NULL) {
2720                 /* TSNH! Huh, why do I need to add this address here? */
2721                 if (sctp_add_remote_addr(*stcb, to, NULL, port,
2722                     SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) {
2723                         return (NULL);
2724                 }
2725                 netl = sctp_findnet(*stcb, to);
2726         }
2727         if (netl) {
2728                 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) {
2729                         netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
2730                         (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL,
2731                             netl);
2732                         send_int_conf = 1;
2733                 }
2734         }
2735         sctp_start_net_timers(*stcb);
2736         if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
2737                 if (!had_a_existing_tcb ||
2738                     (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
2739                         /*
2740                          * If we have a NEW cookie or the connect never
2741                          * reached the connected state during collision we
2742                          * must do the TCP accept thing.
2743                          */
2744                         struct socket *so, *oso;
2745                         struct sctp_inpcb *inp;
2746
2747                         if (notification == SCTP_NOTIFY_ASSOC_RESTART) {
2748                                 /*
2749                                  * For a restart we will keep the same
2750                                  * socket, no need to do anything. I THINK!!
2751                                  */
2752                                 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2753                                 if (send_int_conf) {
2754                                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2755                                             (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2756                                 }
2757                                 return (m);
2758                         }
2759                         oso = (*inp_p)->sctp_socket;
2760                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2761                         SCTP_TCB_UNLOCK((*stcb));
2762                         CURVNET_SET(oso->so_vnet);
2763                         so = sonewconn(oso, 0
2764                             );
2765                         CURVNET_RESTORE();
2766                         SCTP_TCB_LOCK((*stcb));
2767                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2768
2769                         if (so == NULL) {
2770                                 struct mbuf *op_err;
2771 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2772                                 struct socket *pcb_so;
2773 #endif
2774                                 /* Too many sockets */
2775                                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n");
2776                                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2777                                 sctp_abort_association(*inp_p, NULL, m, iphlen,
2778                                     src, dst, sh, op_err,
2779                                     mflowtype, mflowid,
2780                                     vrf_id, port);
2781 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2782                                 pcb_so = SCTP_INP_SO(*inp_p);
2783                                 atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2784                                 SCTP_TCB_UNLOCK((*stcb));
2785                                 SCTP_SOCKET_LOCK(pcb_so, 1);
2786                                 SCTP_TCB_LOCK((*stcb));
2787                                 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2788 #endif
2789                                 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC,
2790                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_23);
2791 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2792                                 SCTP_SOCKET_UNLOCK(pcb_so, 1);
2793 #endif
2794                                 return (NULL);
2795                         }
2796                         inp = (struct sctp_inpcb *)so->so_pcb;
2797                         SCTP_INP_INCR_REF(inp);
2798                         /*
2799                          * We add the unbound flag here so that if we get an
2800                          * soabort() before we get the move_pcb done, we
2801                          * will properly cleanup.
2802                          */
2803                         inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE |
2804                             SCTP_PCB_FLAGS_CONNECTED |
2805                             SCTP_PCB_FLAGS_IN_TCPPOOL |
2806                             SCTP_PCB_FLAGS_UNBOUND |
2807                             (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) |
2808                             SCTP_PCB_FLAGS_DONT_WAKE);
2809                         inp->sctp_features = (*inp_p)->sctp_features;
2810                         inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features;
2811                         inp->sctp_socket = so;
2812                         inp->sctp_frag_point = (*inp_p)->sctp_frag_point;
2813                         inp->max_cwnd = (*inp_p)->max_cwnd;
2814                         inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off;
2815                         inp->ecn_supported = (*inp_p)->ecn_supported;
2816                         inp->prsctp_supported = (*inp_p)->prsctp_supported;
2817                         inp->auth_supported = (*inp_p)->auth_supported;
2818                         inp->asconf_supported = (*inp_p)->asconf_supported;
2819                         inp->reconfig_supported = (*inp_p)->reconfig_supported;
2820                         inp->nrsack_supported = (*inp_p)->nrsack_supported;
2821                         inp->pktdrop_supported = (*inp_p)->pktdrop_supported;
2822                         inp->partial_delivery_point = (*inp_p)->partial_delivery_point;
2823                         inp->sctp_context = (*inp_p)->sctp_context;
2824                         inp->local_strreset_support = (*inp_p)->local_strreset_support;
2825                         inp->fibnum = (*inp_p)->fibnum;
2826                         inp->inp_starting_point_for_iterator = NULL;
2827                         /*
2828                          * copy in the authentication parameters from the
2829                          * original endpoint
2830                          */
2831                         if (inp->sctp_ep.local_hmacs)
2832                                 sctp_free_hmaclist(inp->sctp_ep.local_hmacs);
2833                         inp->sctp_ep.local_hmacs =
2834                             sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs);
2835                         if (inp->sctp_ep.local_auth_chunks)
2836                                 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks);
2837                         inp->sctp_ep.local_auth_chunks =
2838                             sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks);
2839
2840                         /*
2841                          * Now we must move it from one hash table to
2842                          * another and get the tcb in the right place.
2843                          */
2844
2845                         /*
2846                          * This is where the one-2-one socket is put into
2847                          * the accept state waiting for the accept!
2848                          */
2849                         if (*stcb) {
2850                                 (*stcb)->asoc.state |= SCTP_STATE_IN_ACCEPT_QUEUE;
2851                         }
2852                         sctp_move_pcb_and_assoc(*inp_p, inp, *stcb);
2853
2854                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2855                         SCTP_TCB_UNLOCK((*stcb));
2856
2857                         sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb,
2858                             0);
2859                         SCTP_TCB_LOCK((*stcb));
2860                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2861
2862
2863                         /*
2864                          * now we must check to see if we were aborted while
2865                          * the move was going on and the lock/unlock
2866                          * happened.
2867                          */
2868                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
2869                                 /*
2870                                  * yep it was, we leave the assoc attached
2871                                  * to the socket since the sctp_inpcb_free()
2872                                  * call will send an abort for us.
2873                                  */
2874                                 SCTP_INP_DECR_REF(inp);
2875                                 return (NULL);
2876                         }
2877                         SCTP_INP_DECR_REF(inp);
2878                         /* Switch over to the new guy */
2879                         *inp_p = inp;
2880                         sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2881                         if (send_int_conf) {
2882                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2883                                     (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2884                         }
2885                         /*
2886                          * Pull it from the incomplete queue and wake the
2887                          * guy
2888                          */
2889 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2890                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2891                         SCTP_TCB_UNLOCK((*stcb));
2892                         SCTP_SOCKET_LOCK(so, 1);
2893 #endif
2894                         soisconnected(so);
2895 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2896                         SCTP_TCB_LOCK((*stcb));
2897                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2898                         SCTP_SOCKET_UNLOCK(so, 1);
2899 #endif
2900                         return (m);
2901                 }
2902         }
2903         if (notification) {
2904                 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2905         }
2906         if (send_int_conf) {
2907                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2908                     (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2909         }
2910         return (m);
2911 }
2912
2913 static void
2914 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED,
2915     struct sctp_tcb *stcb, struct sctp_nets *net)
2916 {
2917         /* cp must not be used, others call this without a c-ack :-) */
2918         struct sctp_association *asoc;
2919
2920         SCTPDBG(SCTP_DEBUG_INPUT2,
2921             "sctp_handle_cookie_ack: handling COOKIE-ACK\n");
2922         if ((stcb == NULL) || (net == NULL)) {
2923                 return;
2924         }
2925         asoc = &stcb->asoc;
2926
2927         sctp_stop_all_cookie_timers(stcb);
2928         /* process according to association state */
2929         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) {
2930                 /* state change only needed when I am in right state */
2931                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2932                 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
2933                 sctp_start_net_timers(stcb);
2934                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2935                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2936                             stcb->sctp_ep, stcb, asoc->primary_destination);
2937
2938                 }
2939                 /* update RTO */
2940                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
2941                 SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2942                 if (asoc->overall_error_count == 0) {
2943                         net->RTO = sctp_calculate_rto(stcb, asoc, net,
2944                             &asoc->time_entered,
2945                             SCTP_RTT_FROM_NON_DATA);
2946                 }
2947                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
2948                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2949                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2950                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
2951 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2952                         struct socket *so;
2953
2954 #endif
2955                         stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2956 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2957                         so = SCTP_INP_SO(stcb->sctp_ep);
2958                         atomic_add_int(&stcb->asoc.refcnt, 1);
2959                         SCTP_TCB_UNLOCK(stcb);
2960                         SCTP_SOCKET_LOCK(so, 1);
2961                         SCTP_TCB_LOCK(stcb);
2962                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
2963 #endif
2964                         if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) {
2965                                 soisconnected(stcb->sctp_socket);
2966                         }
2967 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2968                         SCTP_SOCKET_UNLOCK(so, 1);
2969 #endif
2970                 }
2971                 /*
2972                  * since we did not send a HB make sure we don't double
2973                  * things
2974                  */
2975                 net->hb_responded = 1;
2976
2977                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
2978                         /*
2979                          * We don't need to do the asconf thing, nor hb or
2980                          * autoclose if the socket is closed.
2981                          */
2982                         goto closed_socket;
2983                 }
2984                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
2985                     stcb, net);
2986
2987
2988                 if (stcb->asoc.sctp_autoclose_ticks &&
2989                     sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2990                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
2991                             stcb->sctp_ep, stcb, NULL);
2992                 }
2993                 /*
2994                  * send ASCONF if parameters are pending and ASCONFs are
2995                  * allowed (eg. addresses changed when init/cookie echo were
2996                  * in flight)
2997                  */
2998                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) &&
2999                     (stcb->asoc.asconf_supported == 1) &&
3000                     (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) {
3001 #ifdef SCTP_TIMER_BASED_ASCONF
3002                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF,
3003                             stcb->sctp_ep, stcb,
3004                             stcb->asoc.primary_destination);
3005 #else
3006                         sctp_send_asconf(stcb, stcb->asoc.primary_destination,
3007                             SCTP_ADDR_NOT_LOCKED);
3008 #endif
3009                 }
3010         }
3011 closed_socket:
3012         /* Toss the cookie if I can */
3013         sctp_toss_old_cookies(stcb, asoc);
3014         if (!TAILQ_EMPTY(&asoc->sent_queue)) {
3015                 /* Restart the timer if we have pending data */
3016                 struct sctp_tmit_chunk *chk;
3017
3018                 chk = TAILQ_FIRST(&asoc->sent_queue);
3019                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
3020         }
3021 }
3022
3023 static void
3024 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp,
3025     struct sctp_tcb *stcb)
3026 {
3027         struct sctp_nets *net;
3028         struct sctp_tmit_chunk *lchk;
3029         struct sctp_ecne_chunk bkup;
3030         uint8_t override_bit;
3031         uint32_t tsn, window_data_tsn;
3032         int len;
3033         unsigned int pkt_cnt;
3034
3035         len = ntohs(cp->ch.chunk_length);
3036         if ((len != sizeof(struct sctp_ecne_chunk)) &&
3037             (len != sizeof(struct old_sctp_ecne_chunk))) {
3038                 return;
3039         }
3040         if (len == sizeof(struct old_sctp_ecne_chunk)) {
3041                 /* Its the old format */
3042                 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk));
3043                 bkup.num_pkts_since_cwr = htonl(1);
3044                 cp = &bkup;
3045         }
3046         SCTP_STAT_INCR(sctps_recvecne);
3047         tsn = ntohl(cp->tsn);
3048         pkt_cnt = ntohl(cp->num_pkts_since_cwr);
3049         lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead);
3050         if (lchk == NULL) {
3051                 window_data_tsn = stcb->asoc.sending_seq - 1;
3052         } else {
3053                 window_data_tsn = lchk->rec.data.tsn;
3054         }
3055
3056         /* Find where it was sent to if possible. */
3057         net = NULL;
3058         TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) {
3059                 if (lchk->rec.data.tsn == tsn) {
3060                         net = lchk->whoTo;
3061                         net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send;
3062                         break;
3063                 }
3064                 if (SCTP_TSN_GT(lchk->rec.data.tsn, tsn)) {
3065                         break;
3066                 }
3067         }
3068         if (net == NULL) {
3069                 /*
3070                  * What to do. A previous send of a CWR was possibly lost.
3071                  * See how old it is, we may have it marked on the actual
3072                  * net.
3073                  */
3074                 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
3075                         if (tsn == net->last_cwr_tsn) {
3076                                 /* Found him, send it off */
3077                                 break;
3078                         }
3079                 }
3080                 if (net == NULL) {
3081                         /*
3082                          * If we reach here, we need to send a special CWR
3083                          * that says hey, we did this a long time ago and
3084                          * you lost the response.
3085                          */
3086                         net = TAILQ_FIRST(&stcb->asoc.nets);
3087                         if (net == NULL) {
3088                                 /* TSNH */
3089                                 return;
3090                         }
3091                         override_bit = SCTP_CWR_REDUCE_OVERRIDE;
3092                 } else {
3093                         override_bit = 0;
3094                 }
3095         } else {
3096                 override_bit = 0;
3097         }
3098         if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) &&
3099             ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
3100                 /*
3101                  * JRS - Use the congestion control given in the pluggable
3102                  * CC module
3103                  */
3104                 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt);
3105                 /*
3106                  * We reduce once every RTT. So we will only lower cwnd at
3107                  * the next sending seq i.e. the window_data_tsn
3108                  */
3109                 net->cwr_window_tsn = window_data_tsn;
3110                 net->ecn_ce_pkt_cnt += pkt_cnt;
3111                 net->lost_cnt = pkt_cnt;
3112                 net->last_cwr_tsn = tsn;
3113         } else {
3114                 override_bit |= SCTP_CWR_IN_SAME_WINDOW;
3115                 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) &&
3116                     ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
3117                         /*
3118                          * Another loss in the same window update how many
3119                          * marks/packets lost we have had.
3120                          */
3121                         int cnt = 1;
3122
3123                         if (pkt_cnt > net->lost_cnt) {
3124                                 /* Should be the case */
3125                                 cnt = (pkt_cnt - net->lost_cnt);
3126                                 net->ecn_ce_pkt_cnt += cnt;
3127                         }
3128                         net->lost_cnt = pkt_cnt;
3129                         net->last_cwr_tsn = tsn;
3130                         /*
3131                          * Most CC functions will ignore this call, since we
3132                          * are in-window yet of the initial CE the peer saw.
3133                          */
3134                         stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt);
3135                 }
3136         }
3137         /*
3138          * We always send a CWR this way if our previous one was lost our
3139          * peer will get an update, or if it is not time again to reduce we
3140          * still get the cwr to the peer. Note we set the override when we
3141          * could not find the TSN on the chunk or the destination network.
3142          */
3143         sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit);
3144 }
3145
3146 static void
3147 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net)
3148 {
3149         /*
3150          * Here we get a CWR from the peer. We must look in the outqueue and
3151          * make sure that we have a covered ECNE in the control chunk part.
3152          * If so remove it.
3153          */
3154         struct sctp_tmit_chunk *chk, *nchk;
3155         struct sctp_ecne_chunk *ecne;
3156         int override;
3157         uint32_t cwr_tsn;
3158
3159         cwr_tsn = ntohl(cp->tsn);
3160         override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE;
3161         TAILQ_FOREACH_SAFE(chk, &stcb->asoc.control_send_queue, sctp_next, nchk) {
3162                 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) {
3163                         continue;
3164                 }
3165                 if ((override == 0) && (chk->whoTo != net)) {
3166                         /* Must be from the right src unless override is set */
3167                         continue;
3168                 }
3169                 ecne = mtod(chk->data, struct sctp_ecne_chunk *);
3170                 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) {
3171                         /* this covers this ECNE, we can remove it */
3172                         stcb->asoc.ecn_echo_cnt_onq--;
3173                         TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk,
3174                             sctp_next);
3175                         sctp_m_freem(chk->data);
3176                         chk->data = NULL;
3177                         stcb->asoc.ctrl_queue_cnt--;
3178                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3179                         if (override == 0) {
3180                                 break;
3181                         }
3182                 }
3183         }
3184 }
3185
3186 static void
3187 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED,
3188     struct sctp_tcb *stcb, struct sctp_nets *net)
3189 {
3190         struct sctp_association *asoc;
3191 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3192         struct socket *so;
3193 #endif
3194
3195         SCTPDBG(SCTP_DEBUG_INPUT2,
3196             "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n");
3197         if (stcb == NULL)
3198                 return;
3199
3200         asoc = &stcb->asoc;
3201         /* process according to association state */
3202         if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
3203                 /* unexpected SHUTDOWN-COMPLETE... so ignore... */
3204                 SCTPDBG(SCTP_DEBUG_INPUT2,
3205                     "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n");
3206                 SCTP_TCB_UNLOCK(stcb);
3207                 return;
3208         }
3209         /* notify upper layer protocol */
3210         if (stcb->sctp_socket) {
3211                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
3212         }
3213 #ifdef INVARIANTS
3214         if (!TAILQ_EMPTY(&asoc->send_queue) ||
3215             !TAILQ_EMPTY(&asoc->sent_queue) ||
3216             sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) {
3217                 panic("Queues are not empty when handling SHUTDOWN-COMPLETE");
3218         }
3219 #endif
3220         /* stop the timer */
3221         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net,
3222             SCTP_FROM_SCTP_INPUT + SCTP_LOC_24);
3223         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
3224         /* free the TCB */
3225         SCTPDBG(SCTP_DEBUG_INPUT2,
3226             "sctp_handle_shutdown_complete: calls free-asoc\n");
3227 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3228         so = SCTP_INP_SO(stcb->sctp_ep);
3229         atomic_add_int(&stcb->asoc.refcnt, 1);
3230         SCTP_TCB_UNLOCK(stcb);
3231         SCTP_SOCKET_LOCK(so, 1);
3232         SCTP_TCB_LOCK(stcb);
3233         atomic_subtract_int(&stcb->asoc.refcnt, 1);
3234 #endif
3235         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
3236             SCTP_FROM_SCTP_INPUT + SCTP_LOC_25);
3237 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3238         SCTP_SOCKET_UNLOCK(so, 1);
3239 #endif
3240         return;
3241 }
3242
3243 static int
3244 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc,
3245     struct sctp_nets *net, uint8_t flg)
3246 {
3247         switch (desc->chunk_type) {
3248         case SCTP_DATA:
3249                 /* find the tsn to resend (possibly */
3250                 {
3251                         uint32_t tsn;
3252                         struct sctp_tmit_chunk *tp1;
3253
3254                         tsn = ntohl(desc->tsn_ifany);
3255                         TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3256                                 if (tp1->rec.data.tsn == tsn) {
3257                                         /* found it */
3258                                         break;
3259                                 }
3260                                 if (SCTP_TSN_GT(tp1->rec.data.tsn, tsn)) {
3261                                         /* not found */
3262                                         tp1 = NULL;
3263                                         break;
3264                                 }
3265                         }
3266                         if (tp1 == NULL) {
3267                                 /*
3268                                  * Do it the other way , aka without paying
3269                                  * attention to queue seq order.
3270                                  */
3271                                 SCTP_STAT_INCR(sctps_pdrpdnfnd);
3272                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3273                                         if (tp1->rec.data.tsn == tsn) {
3274                                                 /* found it */
3275                                                 break;
3276                                         }
3277                                 }
3278                         }
3279                         if (tp1 == NULL) {
3280                                 SCTP_STAT_INCR(sctps_pdrptsnnf);
3281                         }
3282                         if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) {
3283                                 uint8_t *ddp;
3284
3285                                 if (((flg & SCTP_BADCRC) == 0) &&
3286                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3287                                         return (0);
3288                                 }
3289                                 if ((stcb->asoc.peers_rwnd == 0) &&
3290                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3291                                         SCTP_STAT_INCR(sctps_pdrpdiwnp);
3292                                         return (0);
3293                                 }
3294                                 if (stcb->asoc.peers_rwnd == 0 &&
3295                                     (flg & SCTP_FROM_MIDDLE_BOX)) {
3296                                         SCTP_STAT_INCR(sctps_pdrpdizrw);
3297                                         return (0);
3298                                 }
3299                                 ddp = (uint8_t *)(mtod(tp1->data, caddr_t)+
3300                                     sizeof(struct sctp_data_chunk));
3301                                 {
3302                                         unsigned int iii;
3303
3304                                         for (iii = 0; iii < sizeof(desc->data_bytes);
3305                                             iii++) {
3306                                                 if (ddp[iii] != desc->data_bytes[iii]) {
3307                                                         SCTP_STAT_INCR(sctps_pdrpbadd);
3308                                                         return (-1);
3309                                                 }
3310                                         }
3311                                 }
3312
3313                                 if (tp1->do_rtt) {
3314                                         /*
3315                                          * this guy had a RTO calculation
3316                                          * pending on it, cancel it
3317                                          */
3318                                         if (tp1->whoTo->rto_needed == 0) {
3319                                                 tp1->whoTo->rto_needed = 1;
3320                                         }
3321                                         tp1->do_rtt = 0;
3322                                 }
3323                                 SCTP_STAT_INCR(sctps_pdrpmark);
3324                                 if (tp1->sent != SCTP_DATAGRAM_RESEND)
3325                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3326                                 /*
3327                                  * mark it as if we were doing a FR, since
3328                                  * we will be getting gap ack reports behind
3329                                  * the info from the router.
3330                                  */
3331                                 tp1->rec.data.doing_fast_retransmit = 1;
3332                                 /*
3333                                  * mark the tsn with what sequences can
3334                                  * cause a new FR.
3335                                  */
3336                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) {
3337                                         tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
3338                                 } else {
3339                                         tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.tsn;
3340                                 }
3341
3342                                 /* restart the timer */
3343                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3344                                     stcb, tp1->whoTo,
3345                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_26);
3346                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3347                                     stcb, tp1->whoTo);
3348
3349                                 /* fix counts and things */
3350                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
3351                                         sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP,
3352                                             tp1->whoTo->flight_size,
3353                                             tp1->book_size,
3354                                             (uint32_t)(uintptr_t)stcb,
3355                                             tp1->rec.data.tsn);
3356                                 }
3357                                 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
3358                                         sctp_flight_size_decrease(tp1);
3359                                         sctp_total_flight_decrease(stcb, tp1);
3360                                 }
3361                                 tp1->sent = SCTP_DATAGRAM_RESEND;
3362                         } {
3363                                 /* audit code */
3364                                 unsigned int audit;
3365
3366                                 audit = 0;
3367                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3368                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3369                                                 audit++;
3370                                 }
3371                                 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue,
3372                                     sctp_next) {
3373                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3374                                                 audit++;
3375                                 }
3376                                 if (audit != stcb->asoc.sent_queue_retran_cnt) {
3377                                         SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n",
3378                                             audit, stcb->asoc.sent_queue_retran_cnt);
3379 #ifndef SCTP_AUDITING_ENABLED
3380                                         stcb->asoc.sent_queue_retran_cnt = audit;
3381 #endif
3382                                 }
3383                         }
3384                 }
3385                 break;
3386         case SCTP_ASCONF:
3387                 {
3388                         struct sctp_tmit_chunk *asconf;
3389
3390                         TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue,
3391                             sctp_next) {
3392                                 if (asconf->rec.chunk_id.id == SCTP_ASCONF) {
3393                                         break;
3394                                 }
3395                         }
3396                         if (asconf) {
3397                                 if (asconf->sent != SCTP_DATAGRAM_RESEND)
3398                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3399                                 asconf->sent = SCTP_DATAGRAM_RESEND;
3400                                 asconf->snd_count--;
3401                         }
3402                 }
3403                 break;
3404         case SCTP_INITIATION:
3405                 /* resend the INIT */
3406                 stcb->asoc.dropped_special_cnt++;
3407                 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) {
3408                         /*
3409                          * If we can get it in, in a few attempts we do
3410                          * this, otherwise we let the timer fire.
3411                          */
3412                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep,
3413                             stcb, net,
3414                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_27);
3415                         sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
3416                 }
3417                 break;
3418         case SCTP_SELECTIVE_ACK:
3419         case SCTP_NR_SELECTIVE_ACK:
3420                 /* resend the sack */
3421                 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED);
3422                 break;
3423         case SCTP_HEARTBEAT_REQUEST:
3424                 /* resend a demand HB */
3425                 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) {
3426                         /*
3427                          * Only retransmit if we KNOW we wont destroy the
3428                          * tcb
3429                          */
3430                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
3431                 }
3432                 break;
3433         case SCTP_SHUTDOWN:
3434                 sctp_send_shutdown(stcb, net);
3435                 break;
3436         case SCTP_SHUTDOWN_ACK:
3437                 sctp_send_shutdown_ack(stcb, net);
3438                 break;
3439         case SCTP_COOKIE_ECHO:
3440                 {
3441                         struct sctp_tmit_chunk *cookie;
3442
3443                         cookie = NULL;
3444                         TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue,
3445                             sctp_next) {
3446                                 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
3447                                         break;
3448                                 }
3449                         }
3450                         if (cookie) {
3451                                 if (cookie->sent != SCTP_DATAGRAM_RESEND)
3452                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3453                                 cookie->sent = SCTP_DATAGRAM_RESEND;
3454                                 sctp_stop_all_cookie_timers(stcb);
3455                         }
3456                 }
3457                 break;
3458         case SCTP_COOKIE_ACK:
3459                 sctp_send_cookie_ack(stcb);
3460                 break;
3461         case SCTP_ASCONF_ACK:
3462                 /* resend last asconf ack */
3463                 sctp_send_asconf_ack(stcb);
3464                 break;
3465         case SCTP_IFORWARD_CUM_TSN:
3466         case SCTP_FORWARD_CUM_TSN:
3467                 send_forward_tsn(stcb, &stcb->asoc);
3468                 break;
3469                 /* can't do anything with these */
3470         case SCTP_PACKET_DROPPED:
3471         case SCTP_INITIATION_ACK:       /* this should not happen */
3472         case SCTP_HEARTBEAT_ACK:
3473         case SCTP_ABORT_ASSOCIATION:
3474         case SCTP_OPERATION_ERROR:
3475         case SCTP_SHUTDOWN_COMPLETE:
3476         case SCTP_ECN_ECHO:
3477         case SCTP_ECN_CWR:
3478         default:
3479                 break;
3480         }
3481         return (0);
3482 }
3483
3484 void
3485 sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list)
3486 {
3487         uint32_t i;
3488         uint16_t temp;
3489
3490         /*
3491          * We set things to 0xffffffff since this is the last delivered
3492          * sequence and we will be sending in 0 after the reset.
3493          */
3494
3495         if (number_entries) {
3496                 for (i = 0; i < number_entries; i++) {
3497                         temp = ntohs(list[i]);
3498                         if (temp >= stcb->asoc.streamincnt) {
3499                                 continue;
3500                         }
3501                         stcb->asoc.strmin[temp].last_mid_delivered = 0xffffffff;
3502                 }
3503         } else {
3504                 list = NULL;
3505                 for (i = 0; i < stcb->asoc.streamincnt; i++) {
3506                         stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff;
3507                 }
3508         }
3509         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3510 }
3511
3512 static void
3513 sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list)
3514 {
3515         uint32_t i;
3516         uint16_t temp;
3517
3518         if (number_entries > 0) {
3519                 for (i = 0; i < number_entries; i++) {
3520                         temp = ntohs(list[i]);
3521                         if (temp >= stcb->asoc.streamoutcnt) {
3522                                 /* no such stream */
3523                                 continue;
3524                         }
3525                         stcb->asoc.strmout[temp].next_mid_ordered = 0;
3526                         stcb->asoc.strmout[temp].next_mid_unordered = 0;
3527                 }
3528         } else {
3529                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3530                         stcb->asoc.strmout[i].next_mid_ordered = 0;
3531                         stcb->asoc.strmout[i].next_mid_unordered = 0;
3532                 }
3533         }
3534         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3535 }
3536
3537 static void
3538 sctp_reset_clear_pending(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list)
3539 {
3540         uint32_t i;
3541         uint16_t temp;
3542
3543         if (number_entries > 0) {
3544                 for (i = 0; i < number_entries; i++) {
3545                         temp = ntohs(list[i]);
3546                         if (temp >= stcb->asoc.streamoutcnt) {
3547                                 /* no such stream */
3548                                 continue;
3549                         }
3550                         stcb->asoc.strmout[temp].state = SCTP_STREAM_OPEN;
3551                 }
3552         } else {
3553                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3554                         stcb->asoc.strmout[i].state = SCTP_STREAM_OPEN;
3555                 }
3556         }
3557 }
3558
3559
3560 struct sctp_stream_reset_request *
3561 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk)
3562 {
3563         struct sctp_association *asoc;
3564         struct sctp_chunkhdr *ch;
3565         struct sctp_stream_reset_request *r;
3566         struct sctp_tmit_chunk *chk;
3567         int len, clen;
3568
3569         asoc = &stcb->asoc;
3570         if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
3571                 asoc->stream_reset_outstanding = 0;
3572                 return (NULL);
3573         }
3574         if (stcb->asoc.str_reset == NULL) {
3575                 asoc->stream_reset_outstanding = 0;
3576                 return (NULL);
3577         }
3578         chk = stcb->asoc.str_reset;
3579         if (chk->data == NULL) {
3580                 return (NULL);
3581         }
3582         if (bchk) {
3583                 /* he wants a copy of the chk pointer */
3584                 *bchk = chk;
3585         }
3586         clen = chk->send_size;
3587         ch = mtod(chk->data, struct sctp_chunkhdr *);
3588         r = (struct sctp_stream_reset_request *)(ch + 1);
3589         if (ntohl(r->request_seq) == seq) {
3590                 /* found it */
3591                 return (r);
3592         }
3593         len = SCTP_SIZE32(ntohs(r->ph.param_length));
3594         if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) {
3595                 /* move to the next one, there can only be a max of two */
3596                 r = (struct sctp_stream_reset_request *)((caddr_t)r + len);
3597                 if (ntohl(r->request_seq) == seq) {
3598                         return (r);
3599                 }
3600         }
3601         /* that seq is not here */
3602         return (NULL);
3603 }
3604
3605 static void
3606 sctp_clean_up_stream_reset(struct sctp_tcb *stcb)
3607 {
3608         struct sctp_association *asoc;
3609         struct sctp_tmit_chunk *chk = stcb->asoc.str_reset;
3610
3611         if (stcb->asoc.str_reset == NULL) {
3612                 return;
3613         }
3614         asoc = &stcb->asoc;
3615
3616         sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb,
3617             chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_28);
3618         TAILQ_REMOVE(&asoc->control_send_queue,
3619             chk,
3620             sctp_next);
3621         if (chk->data) {
3622                 sctp_m_freem(chk->data);
3623                 chk->data = NULL;
3624         }
3625         asoc->ctrl_queue_cnt--;
3626         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3627         /* sa_ignore NO_NULL_CHK */
3628         stcb->asoc.str_reset = NULL;
3629 }
3630
3631
3632 static int
3633 sctp_handle_stream_reset_response(struct sctp_tcb *stcb,
3634     uint32_t seq, uint32_t action,
3635     struct sctp_stream_reset_response *respin)
3636 {
3637         uint16_t type;
3638         int lparam_len;
3639         struct sctp_association *asoc = &stcb->asoc;
3640         struct sctp_tmit_chunk *chk;
3641         struct sctp_stream_reset_request *req_param;
3642         struct sctp_stream_reset_out_request *req_out_param;
3643         struct sctp_stream_reset_in_request *req_in_param;
3644         uint32_t number_entries;
3645
3646         if (asoc->stream_reset_outstanding == 0) {
3647                 /* duplicate */
3648                 return (0);
3649         }
3650         if (seq == stcb->asoc.str_reset_seq_out) {
3651                 req_param = sctp_find_stream_reset(stcb, seq, &chk);
3652                 if (req_param != NULL) {
3653                         stcb->asoc.str_reset_seq_out++;
3654                         type = ntohs(req_param->ph.param_type);
3655                         lparam_len = ntohs(req_param->ph.param_length);
3656                         if (type == SCTP_STR_RESET_OUT_REQUEST) {
3657                                 int no_clear = 0;
3658
3659                                 req_out_param = (struct sctp_stream_reset_out_request *)req_param;
3660                                 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t);
3661                                 asoc->stream_reset_out_is_outstanding = 0;
3662                                 if (asoc->stream_reset_outstanding)
3663                                         asoc->stream_reset_outstanding--;
3664                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3665                                         /* do it */
3666                                         sctp_reset_out_streams(stcb, number_entries, req_out_param->list_of_streams);
3667                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3668                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3669                                 } else if (action == SCTP_STREAM_RESET_RESULT_IN_PROGRESS) {
3670                                         /*
3671                                          * Set it up so we don't stop
3672                                          * retransmitting
3673                                          */
3674                                         asoc->stream_reset_outstanding++;
3675                                         stcb->asoc.str_reset_seq_out--;
3676                                         asoc->stream_reset_out_is_outstanding = 1;
3677                                         no_clear = 1;
3678                                 } else {
3679                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3680                                 }
3681                                 if (no_clear == 0) {
3682                                         sctp_reset_clear_pending(stcb, number_entries, req_out_param->list_of_streams);
3683                                 }
3684                         } else if (type == SCTP_STR_RESET_IN_REQUEST) {
3685                                 req_in_param = (struct sctp_stream_reset_in_request *)req_param;
3686                                 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t);
3687                                 if (asoc->stream_reset_outstanding)
3688                                         asoc->stream_reset_outstanding--;
3689                                 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3690                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb,
3691                                             number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3692                                 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3693                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb,
3694                                             number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3695                                 }
3696                         } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) {
3697                                 /* Ok we now may have more streams */
3698                                 int num_stream;
3699
3700                                 num_stream = stcb->asoc.strm_pending_add_size;
3701                                 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) {
3702                                         /* TSNH */
3703                                         num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt;
3704                                 }
3705                                 stcb->asoc.strm_pending_add_size = 0;
3706                                 if (asoc->stream_reset_outstanding)
3707                                         asoc->stream_reset_outstanding--;
3708                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3709                                         /* Put the new streams into effect */
3710                                         int i;
3711
3712                                         for (i = asoc->streamoutcnt; i < (asoc->streamoutcnt + num_stream); i++) {
3713                                                 asoc->strmout[i].state = SCTP_STREAM_OPEN;
3714                                         }
3715                                         asoc->streamoutcnt += num_stream;
3716                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
3717                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3718                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3719                                             SCTP_STREAM_CHANGE_DENIED);
3720                                 } else {
3721                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3722                                             SCTP_STREAM_CHANGE_FAILED);
3723                                 }
3724                         } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) {
3725                                 if (asoc->stream_reset_outstanding)
3726                                         asoc->stream_reset_outstanding--;
3727                                 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3728                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3729                                             SCTP_STREAM_CHANGE_DENIED);
3730                                 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3731                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3732                                             SCTP_STREAM_CHANGE_FAILED);
3733                                 }
3734                         } else if (type == SCTP_STR_RESET_TSN_REQUEST) {
3735                                 /**
3736                                  * a) Adopt the new in tsn.
3737                                  * b) reset the map
3738                                  * c) Adopt the new out-tsn
3739                                  */
3740                                 struct sctp_stream_reset_response_tsn *resp;
3741                                 struct sctp_forward_tsn_chunk fwdtsn;
3742                                 int abort_flag = 0;
3743
3744                                 if (respin == NULL) {
3745                                         /* huh ? */
3746                                         return (0);
3747                                 }
3748                                 if (ntohs(respin->ph.param_length) < sizeof(struct sctp_stream_reset_response_tsn)) {
3749                                         return (0);
3750                                 }
3751                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3752                                         resp = (struct sctp_stream_reset_response_tsn *)respin;
3753                                         asoc->stream_reset_outstanding--;
3754                                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3755                                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3756                                         fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1);
3757                                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3758                                         if (abort_flag) {
3759                                                 return (1);
3760                                         }
3761                                         stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1);
3762                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3763                                                 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3764                                         }
3765                                         stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map;
3766                                         stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn);
3767                                         memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size);
3768
3769                                         stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map;
3770                                         memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size);
3771
3772                                         stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn);
3773                                         stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn;
3774
3775                                         sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL);
3776                                         sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL);
3777                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0);
3778                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3779                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
3780                                             SCTP_ASSOC_RESET_DENIED);
3781                                 } else {
3782                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
3783                                             SCTP_ASSOC_RESET_FAILED);
3784                                 }
3785                         }
3786                         /* get rid of the request and get the request flags */
3787                         if (asoc->stream_reset_outstanding == 0) {
3788                                 sctp_clean_up_stream_reset(stcb);
3789                         }
3790                 }
3791         }
3792         if (asoc->stream_reset_outstanding == 0) {
3793                 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED);
3794         }
3795         return (0);
3796 }
3797
3798 static void
3799 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb,
3800     struct sctp_tmit_chunk *chk,
3801     struct sctp_stream_reset_in_request *req, int trunc)
3802 {
3803         uint32_t seq;
3804         int len, i;
3805         int number_entries;
3806         uint16_t temp;
3807
3808         /*
3809          * peer wants me to send a str-reset to him for my outgoing seq's if
3810          * seq_in is right.
3811          */
3812         struct sctp_association *asoc = &stcb->asoc;
3813
3814         seq = ntohl(req->request_seq);
3815         if (asoc->str_reset_seq_in == seq) {
3816                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3817                 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
3818                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3819                 } else if (trunc) {
3820                         /* Can't do it, since they exceeded our buffer size  */
3821                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3822                 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) {
3823                         len = ntohs(req->ph.param_length);
3824                         number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t));
3825                         if (number_entries) {
3826                                 for (i = 0; i < number_entries; i++) {
3827                                         temp = ntohs(req->list_of_streams[i]);
3828                                         if (temp >= stcb->asoc.streamoutcnt) {
3829                                                 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3830                                                 goto bad_boy;
3831                                         }
3832                                         req->list_of_streams[i] = temp;
3833                                 }
3834                                 for (i = 0; i < number_entries; i++) {
3835                                         if (stcb->asoc.strmout[req->list_of_streams[i]].state == SCTP_STREAM_OPEN) {
3836                                                 stcb->asoc.strmout[req->list_of_streams[i]].state = SCTP_STREAM_RESET_PENDING;
3837                                         }
3838                                 }
3839                         } else {
3840                                 /* Its all */
3841                                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3842                                         if (stcb->asoc.strmout[i].state == SCTP_STREAM_OPEN)
3843                                                 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_PENDING;
3844                                 }
3845                         }
3846                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3847                 } else {
3848                         /* Can't do it, since we have sent one out */
3849                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
3850                 }
3851 bad_boy:
3852                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3853                 asoc->str_reset_seq_in++;
3854         } else if (asoc->str_reset_seq_in - 1 == seq) {
3855                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3856         } else if (asoc->str_reset_seq_in - 2 == seq) {
3857                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3858         } else {
3859                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3860         }
3861         sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED);
3862 }
3863
3864 static int
3865 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb,
3866     struct sctp_tmit_chunk *chk,
3867     struct sctp_stream_reset_tsn_request *req)
3868 {
3869         /* reset all in and out and update the tsn */
3870         /*
3871          * A) reset my str-seq's on in and out. B) Select a receive next,
3872          * and set cum-ack to it. Also process this selected number as a
3873          * fwd-tsn as well. C) set in the response my next sending seq.
3874          */
3875         struct sctp_forward_tsn_chunk fwdtsn;
3876         struct sctp_association *asoc = &stcb->asoc;
3877         int abort_flag = 0;
3878         uint32_t seq;
3879
3880         seq = ntohl(req->request_seq);
3881         if (asoc->str_reset_seq_in == seq) {
3882                 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0];
3883                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
3884                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3885                 } else {
3886                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3887                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3888                         fwdtsn.ch.chunk_flags = 0;
3889                         fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1);
3890                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3891                         if (abort_flag) {
3892                                 return (1);
3893                         }
3894                         asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA;
3895                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3896                                 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3897                         }
3898                         asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map;
3899                         asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1;
3900                         memset(asoc->mapping_array, 0, asoc->mapping_array_size);
3901                         asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
3902                         memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size);
3903                         atomic_add_int(&asoc->sending_seq, 1);
3904                         /* save off historical data for retrans */
3905                         asoc->last_sending_seq[1] = asoc->last_sending_seq[0];
3906                         asoc->last_sending_seq[0] = asoc->sending_seq;
3907                         asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0];
3908                         asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn;
3909                         sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL);
3910                         sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL);
3911                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3912                         sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0);
3913                 }
3914                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3915                     asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
3916                 asoc->str_reset_seq_in++;
3917         } else if (asoc->str_reset_seq_in - 1 == seq) {
3918                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3919                     asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
3920         } else if (asoc->str_reset_seq_in - 2 == seq) {
3921                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1],
3922                     asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]);
3923         } else {
3924                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3925         }
3926         return (0);
3927 }
3928
3929 static void
3930 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb,
3931     struct sctp_tmit_chunk *chk,
3932     struct sctp_stream_reset_out_request *req, int trunc)
3933 {
3934         uint32_t seq, tsn;
3935         int number_entries, len;
3936         struct sctp_association *asoc = &stcb->asoc;
3937
3938         seq = ntohl(req->request_seq);
3939
3940         /* now if its not a duplicate we process it */
3941         if (asoc->str_reset_seq_in == seq) {
3942                 len = ntohs(req->ph.param_length);
3943                 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t));
3944                 /*
3945                  * the sender is resetting, handle the list issue.. we must
3946                  * a) verify if we can do the reset, if so no problem b) If
3947                  * we can't do the reset we must copy the request. c) queue
3948                  * it, and setup the data in processor to trigger it off
3949                  * when needed and dequeue all the queued data.
3950                  */
3951                 tsn = ntohl(req->send_reset_at_tsn);
3952
3953                 /* move the reset action back one */
3954                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3955                 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
3956                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3957                 } else if (trunc) {
3958                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3959                 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) {
3960                         /* we can do it now */
3961                         sctp_reset_in_stream(stcb, number_entries, req->list_of_streams);
3962                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3963                 } else {
3964                         /*
3965                          * we must queue it up and thus wait for the TSN's
3966                          * to arrive that are at or before tsn
3967                          */
3968                         struct sctp_stream_reset_list *liste;
3969                         int siz;
3970
3971                         siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t));
3972                         SCTP_MALLOC(liste, struct sctp_stream_reset_list *,
3973                             siz, SCTP_M_STRESET);
3974                         if (liste == NULL) {
3975                                 /* gak out of memory */
3976                                 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3977                                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3978                                 return;
3979                         }
3980                         liste->seq = seq;
3981                         liste->tsn = tsn;
3982                         liste->number_entries = number_entries;
3983                         memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t));
3984                         TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp);
3985                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_IN_PROGRESS;
3986                 }
3987                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3988                 asoc->str_reset_seq_in++;
3989         } else if ((asoc->str_reset_seq_in - 1) == seq) {
3990                 /*
3991                  * one seq back, just echo back last action since my
3992                  * response was lost.
3993                  */
3994                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3995         } else if ((asoc->str_reset_seq_in - 2) == seq) {
3996                 /*
3997                  * two seq back, just echo back last action since my
3998                  * response was lost.
3999                  */
4000                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
4001         } else {
4002                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
4003         }
4004 }
4005
4006 static void
4007 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
4008     struct sctp_stream_reset_add_strm *str_add)
4009 {
4010         /*
4011          * Peer is requesting to add more streams. If its within our
4012          * max-streams we will allow it.
4013          */
4014         uint32_t num_stream, i;
4015         uint32_t seq;
4016         struct sctp_association *asoc = &stcb->asoc;
4017         struct sctp_queued_to_read *ctl, *nctl;
4018
4019         /* Get the number. */
4020         seq = ntohl(str_add->request_seq);
4021         num_stream = ntohs(str_add->number_of_streams);
4022         /* Now what would be the new total? */
4023         if (asoc->str_reset_seq_in == seq) {
4024                 num_stream += stcb->asoc.streamincnt;
4025                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
4026                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
4027                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4028                 } else if ((num_stream > stcb->asoc.max_inbound_streams) ||
4029                     (num_stream > 0xffff)) {
4030                         /* We must reject it they ask for to many */
4031         denied:
4032                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4033                 } else {
4034                         /* Ok, we can do that :-) */
4035                         struct sctp_stream_in *oldstrm;
4036
4037                         /* save off the old */
4038                         oldstrm = stcb->asoc.strmin;
4039                         SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *,
4040                             (num_stream * sizeof(struct sctp_stream_in)),
4041                             SCTP_M_STRMI);
4042                         if (stcb->asoc.strmin == NULL) {
4043                                 stcb->asoc.strmin = oldstrm;
4044                                 goto denied;
4045                         }
4046                         /* copy off the old data */
4047                         for (i = 0; i < stcb->asoc.streamincnt; i++) {
4048                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
4049                                 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue);
4050                                 stcb->asoc.strmin[i].sid = i;
4051                                 stcb->asoc.strmin[i].last_mid_delivered = oldstrm[i].last_mid_delivered;
4052                                 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started;
4053                                 stcb->asoc.strmin[i].pd_api_started = oldstrm[i].pd_api_started;
4054                                 /* now anything on those queues? */
4055                                 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next_instrm, nctl) {
4056                                         TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next_instrm);
4057                                         TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next_instrm);
4058                                 }
4059                                 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].uno_inqueue, next_instrm, nctl) {
4060                                         TAILQ_REMOVE(&oldstrm[i].uno_inqueue, ctl, next_instrm);
4061                                         TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].uno_inqueue, ctl, next_instrm);
4062                                 }
4063                         }
4064                         /* Init the new streams */
4065                         for (i = stcb->asoc.streamincnt; i < num_stream; i++) {
4066                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
4067                                 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue);
4068                                 stcb->asoc.strmin[i].sid = i;
4069                                 stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff;
4070                                 stcb->asoc.strmin[i].pd_api_started = 0;
4071                                 stcb->asoc.strmin[i].delivery_started = 0;
4072                         }
4073                         SCTP_FREE(oldstrm, SCTP_M_STRMI);
4074                         /* update the size */
4075                         stcb->asoc.streamincnt = num_stream;
4076                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
4077                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
4078                 }
4079                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4080                 asoc->str_reset_seq_in++;
4081         } else if ((asoc->str_reset_seq_in - 1) == seq) {
4082                 /*
4083                  * one seq back, just echo back last action since my
4084                  * response was lost.
4085                  */
4086                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4087         } else if ((asoc->str_reset_seq_in - 2) == seq) {
4088                 /*
4089                  * two seq back, just echo back last action since my
4090                  * response was lost.
4091                  */
4092                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
4093         } else {
4094                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
4095
4096         }
4097 }
4098
4099 static void
4100 sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
4101     struct sctp_stream_reset_add_strm *str_add)
4102 {
4103         /*
4104          * Peer is requesting to add more streams. If its within our
4105          * max-streams we will allow it.
4106          */
4107         uint16_t num_stream;
4108         uint32_t seq;
4109         struct sctp_association *asoc = &stcb->asoc;
4110
4111         /* Get the number. */
4112         seq = ntohl(str_add->request_seq);
4113         num_stream = ntohs(str_add->number_of_streams);
4114         /* Now what would be the new total? */
4115         if (asoc->str_reset_seq_in == seq) {
4116                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
4117                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
4118                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4119                 } else if (stcb->asoc.stream_reset_outstanding) {
4120                         /* We must reject it we have something pending */
4121                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
4122                 } else {
4123                         /* Ok, we can do that :-) */
4124                         int mychk;
4125
4126                         mychk = stcb->asoc.streamoutcnt;
4127                         mychk += num_stream;
4128                         if (mychk < 0x10000) {
4129                                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
4130                                 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 1, num_stream, 0, 1)) {
4131                                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4132                                 }
4133                         } else {
4134                                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4135                         }
4136                 }
4137                 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]);
4138                 asoc->str_reset_seq_in++;
4139         } else if ((asoc->str_reset_seq_in - 1) == seq) {
4140                 /*
4141                  * one seq back, just echo back last action since my
4142                  * response was lost.
4143                  */
4144                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4145         } else if ((asoc->str_reset_seq_in - 2) == seq) {
4146                 /*
4147                  * two seq back, just echo back last action since my
4148                  * response was lost.
4149                  */
4150                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
4151         } else {
4152                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
4153         }
4154 }
4155
4156 #ifdef __GNUC__
4157 __attribute__((noinline))
4158 #endif
4159 static int
4160 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset,
4161     struct sctp_chunkhdr *ch_req)
4162 {
4163         uint16_t remaining_length, param_len, ptype;
4164         struct sctp_paramhdr pstore;
4165         uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE];
4166         uint32_t seq = 0;
4167         int num_req = 0;
4168         int trunc = 0;
4169         struct sctp_tmit_chunk *chk;
4170         struct sctp_chunkhdr *ch;
4171         struct sctp_paramhdr *ph;
4172         int ret_code = 0;
4173         int num_param = 0;
4174
4175         /* now it may be a reset or a reset-response */
4176         remaining_length = ntohs(ch_req->chunk_length) - sizeof(struct sctp_chunkhdr);
4177
4178         /* setup for adding the response */
4179         sctp_alloc_a_chunk(stcb, chk);
4180         if (chk == NULL) {
4181                 return (ret_code);
4182         }
4183         chk->copy_by_ref = 0;
4184         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
4185         chk->rec.chunk_id.can_take_data = 0;
4186         chk->flags = 0;
4187         chk->asoc = &stcb->asoc;
4188         chk->no_fr_allowed = 0;
4189         chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr);
4190         chk->book_size_scale = 0;
4191         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
4192         if (chk->data == NULL) {
4193 strres_nochunk:
4194                 if (chk->data) {
4195                         sctp_m_freem(chk->data);
4196                         chk->data = NULL;
4197                 }
4198                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
4199                 return (ret_code);
4200         }
4201         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
4202
4203         /* setup chunk parameters */
4204         chk->sent = SCTP_DATAGRAM_UNSENT;
4205         chk->snd_count = 0;
4206         chk->whoTo = NULL;
4207
4208         ch = mtod(chk->data, struct sctp_chunkhdr *);
4209         ch->chunk_type = SCTP_STREAM_RESET;
4210         ch->chunk_flags = 0;
4211         ch->chunk_length = htons(chk->send_size);
4212         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
4213         offset += sizeof(struct sctp_chunkhdr);
4214         while (remaining_length >= sizeof(struct sctp_paramhdr)) {
4215                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *)&pstore);
4216                 if (ph == NULL) {
4217                         /* TSNH */
4218                         break;
4219                 }
4220                 param_len = ntohs(ph->param_length);
4221                 if ((param_len > remaining_length) ||
4222                     (param_len < (sizeof(struct sctp_paramhdr) + sizeof(uint32_t)))) {
4223                         /* bad parameter length */
4224                         break;
4225                 }
4226                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, sizeof(cstore)),
4227                     (uint8_t *)&cstore);
4228                 if (ph == NULL) {
4229                         /* TSNH */
4230                         break;
4231                 }
4232                 ptype = ntohs(ph->param_type);
4233                 num_param++;
4234                 if (param_len > sizeof(cstore)) {
4235                         trunc = 1;
4236                 } else {
4237                         trunc = 0;
4238                 }
4239                 if (num_param > SCTP_MAX_RESET_PARAMS) {
4240                         /* hit the max of parameters already sorry.. */
4241                         break;
4242                 }
4243                 if (ptype == SCTP_STR_RESET_OUT_REQUEST) {
4244                         struct sctp_stream_reset_out_request *req_out;
4245
4246                         if (param_len < sizeof(struct sctp_stream_reset_out_request)) {
4247                                 break;
4248                         }
4249                         req_out = (struct sctp_stream_reset_out_request *)ph;
4250                         num_req++;
4251                         if (stcb->asoc.stream_reset_outstanding) {
4252                                 seq = ntohl(req_out->response_seq);
4253                                 if (seq == stcb->asoc.str_reset_seq_out) {
4254                                         /* implicit ack */
4255                                         (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL);
4256                                 }
4257                         }
4258                         sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc);
4259                 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) {
4260                         struct sctp_stream_reset_add_strm *str_add;
4261
4262                         if (param_len < sizeof(struct sctp_stream_reset_add_strm)) {
4263                                 break;
4264                         }
4265                         str_add = (struct sctp_stream_reset_add_strm *)ph;
4266                         num_req++;
4267                         sctp_handle_str_reset_add_strm(stcb, chk, str_add);
4268                 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) {
4269                         struct sctp_stream_reset_add_strm *str_add;
4270
4271                         if (param_len < sizeof(struct sctp_stream_reset_add_strm)) {
4272                                 break;
4273                         }
4274                         str_add = (struct sctp_stream_reset_add_strm *)ph;
4275                         num_req++;
4276                         sctp_handle_str_reset_add_out_strm(stcb, chk, str_add);
4277                 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) {
4278                         struct sctp_stream_reset_in_request *req_in;
4279
4280                         num_req++;
4281                         req_in = (struct sctp_stream_reset_in_request *)ph;
4282                         sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc);
4283                 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) {
4284                         struct sctp_stream_reset_tsn_request *req_tsn;
4285
4286                         num_req++;
4287                         req_tsn = (struct sctp_stream_reset_tsn_request *)ph;
4288                         if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) {
4289                                 ret_code = 1;
4290                                 goto strres_nochunk;
4291                         }
4292                         /* no more */
4293                         break;
4294                 } else if (ptype == SCTP_STR_RESET_RESPONSE) {
4295                         struct sctp_stream_reset_response *resp;
4296                         uint32_t result;
4297
4298                         if (param_len < sizeof(struct sctp_stream_reset_response)) {
4299                                 break;
4300                         }
4301                         resp = (struct sctp_stream_reset_response *)ph;
4302                         seq = ntohl(resp->response_seq);
4303                         result = ntohl(resp->result);
4304                         if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) {
4305                                 ret_code = 1;
4306                                 goto strres_nochunk;
4307                         }
4308                 } else {
4309                         break;
4310                 }
4311                 offset += SCTP_SIZE32(param_len);
4312                 if (remaining_length >= SCTP_SIZE32(param_len)) {
4313                         remaining_length -= SCTP_SIZE32(param_len);
4314                 } else {
4315                         remaining_length = 0;
4316                 }
4317         }
4318         if (num_req == 0) {
4319                 /* we have no response free the stuff */
4320                 goto strres_nochunk;
4321         }
4322         /* ok we have a chunk to link in */
4323         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue,
4324             chk,
4325             sctp_next);
4326         stcb->asoc.ctrl_queue_cnt++;
4327         return (ret_code);
4328 }
4329
4330 /*
4331  * Handle a router or endpoints report of a packet loss, there are two ways
4332  * to handle this, either we get the whole packet and must disect it
4333  * ourselves (possibly with truncation and or corruption) or it is a summary
4334  * from a middle box that did the disectting for us.
4335  */
4336 static void
4337 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp,
4338     struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit)
4339 {
4340         uint32_t bottle_bw, on_queue;
4341         uint16_t trunc_len;
4342         unsigned int chlen;
4343         unsigned int at;
4344         struct sctp_chunk_desc desc;
4345         struct sctp_chunkhdr *ch;
4346
4347         chlen = ntohs(cp->ch.chunk_length);
4348         chlen -= sizeof(struct sctp_pktdrop_chunk);
4349         /* XXX possible chlen underflow */
4350         if (chlen == 0) {
4351                 ch = NULL;
4352                 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)
4353                         SCTP_STAT_INCR(sctps_pdrpbwrpt);
4354         } else {
4355                 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr));
4356                 chlen -= sizeof(struct sctphdr);
4357                 /* XXX possible chlen underflow */
4358                 memset(&desc, 0, sizeof(desc));
4359         }
4360         trunc_len = (uint16_t)ntohs(cp->trunc_len);
4361         if (trunc_len > limit) {
4362                 trunc_len = limit;
4363         }
4364         /* now the chunks themselves */
4365         while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) {
4366                 desc.chunk_type = ch->chunk_type;
4367                 /* get amount we need to move */
4368                 at = ntohs(ch->chunk_length);
4369                 if (at < sizeof(struct sctp_chunkhdr)) {
4370                         /* corrupt chunk, maybe at the end? */
4371                         SCTP_STAT_INCR(sctps_pdrpcrupt);
4372                         break;
4373                 }
4374                 if (trunc_len == 0) {
4375                         /* we are supposed to have all of it */
4376                         if (at > chlen) {
4377                                 /* corrupt skip it */
4378                                 SCTP_STAT_INCR(sctps_pdrpcrupt);
4379                                 break;
4380                         }
4381                 } else {
4382                         /* is there enough of it left ? */
4383                         if (desc.chunk_type == SCTP_DATA) {
4384                                 if (chlen < (sizeof(struct sctp_data_chunk) +
4385                                     sizeof(desc.data_bytes))) {
4386                                         break;
4387                                 }
4388                         } else {
4389                                 if (chlen < sizeof(struct sctp_chunkhdr)) {
4390                                         break;
4391                                 }
4392                         }
4393                 }
4394                 if (desc.chunk_type == SCTP_DATA) {
4395                         /* can we get out the tsn? */
4396                         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
4397                                 SCTP_STAT_INCR(sctps_pdrpmbda);
4398
4399                         if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) {
4400                                 /* yep */
4401                                 struct sctp_data_chunk *dcp;
4402                                 uint8_t *ddp;
4403                                 unsigned int iii;
4404
4405                                 dcp = (struct sctp_data_chunk *)ch;
4406                                 ddp = (uint8_t *)(dcp + 1);
4407                                 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) {
4408                                         desc.data_bytes[iii] = ddp[iii];
4409                                 }
4410                                 desc.tsn_ifany = dcp->dp.tsn;
4411                         } else {
4412                                 /* nope we are done. */
4413                                 SCTP_STAT_INCR(sctps_pdrpnedat);
4414                                 break;
4415                         }
4416                 } else {
4417                         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
4418                                 SCTP_STAT_INCR(sctps_pdrpmbct);
4419                 }
4420
4421                 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) {
4422                         SCTP_STAT_INCR(sctps_pdrppdbrk);
4423                         break;
4424                 }
4425                 if (SCTP_SIZE32(at) > chlen) {
4426                         break;
4427                 }
4428                 chlen -= SCTP_SIZE32(at);
4429                 if (chlen < sizeof(struct sctp_chunkhdr)) {
4430                         /* done, none left */
4431                         break;
4432                 }
4433                 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at));
4434         }
4435         /* Now update any rwnd --- possibly */
4436         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) {
4437                 /* From a peer, we get a rwnd report */
4438                 uint32_t a_rwnd;
4439
4440                 SCTP_STAT_INCR(sctps_pdrpfehos);
4441
4442                 bottle_bw = ntohl(cp->bottle_bw);
4443                 on_queue = ntohl(cp->current_onq);
4444                 if (bottle_bw && on_queue) {
4445                         /* a rwnd report is in here */
4446                         if (bottle_bw > on_queue)
4447                                 a_rwnd = bottle_bw - on_queue;
4448                         else
4449                                 a_rwnd = 0;
4450
4451                         if (a_rwnd == 0)
4452                                 stcb->asoc.peers_rwnd = 0;
4453                         else {
4454                                 if (a_rwnd > stcb->asoc.total_flight) {
4455                                         stcb->asoc.peers_rwnd =
4456                                             a_rwnd - stcb->asoc.total_flight;
4457                                 } else {
4458                                         stcb->asoc.peers_rwnd = 0;
4459                                 }
4460                                 if (stcb->asoc.peers_rwnd <
4461                                     stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
4462                                         /* SWS sender side engages */
4463                                         stcb->asoc.peers_rwnd = 0;
4464                                 }
4465                         }
4466                 }
4467         } else {
4468                 SCTP_STAT_INCR(sctps_pdrpfmbox);
4469         }
4470
4471         /* now middle boxes in sat networks get a cwnd bump */
4472         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) &&
4473             (stcb->asoc.sat_t3_loss_recovery == 0) &&
4474             (stcb->asoc.sat_network)) {
4475                 /*
4476                  * This is debatable but for sat networks it makes sense
4477                  * Note if a T3 timer has went off, we will prohibit any
4478                  * changes to cwnd until we exit the t3 loss recovery.
4479                  */
4480                 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb,
4481                     net, cp, &bottle_bw, &on_queue);
4482         }
4483 }
4484
4485 /*
4486  * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to
4487  * still contain IP/SCTP header - stcb: is the tcb found for this packet -
4488  * offset: offset into the mbuf chain to first chunkhdr - length: is the
4489  * length of the complete packet outputs: - length: modified to remaining
4490  * length after control processing - netp: modified to new sctp_nets after
4491  * cookie-echo processing - return NULL to discard the packet (ie. no asoc,
4492  * bad packet,...) otherwise return the tcb for this packet
4493  */
4494 #ifdef __GNUC__
4495 __attribute__((noinline))
4496 #endif
4497 static struct sctp_tcb *
4498 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length,
4499     struct sockaddr *src, struct sockaddr *dst,
4500     struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp,
4501     struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen,
4502     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
4503     uint32_t vrf_id, uint16_t port)
4504 {
4505         struct sctp_association *asoc;
4506         struct mbuf *op_err;
4507         char msg[SCTP_DIAG_INFO_LEN];
4508         uint32_t vtag_in;
4509         int num_chunks = 0;     /* number of control chunks processed */
4510         uint32_t chk_length;
4511         int ret;
4512         int abort_no_unlock = 0;
4513         int ecne_seen = 0;
4514
4515         /*
4516          * How big should this be, and should it be alloc'd? Lets try the
4517          * d-mtu-ceiling for now (2k) and that should hopefully work ...
4518          * until we get into jumbo grams and such..
4519          */
4520         uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE];
4521         int got_auth = 0;
4522         uint32_t auth_offset = 0, auth_len = 0;
4523         int auth_skipped = 0;
4524         int asconf_cnt = 0;
4525 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4526         struct socket *so;
4527 #endif
4528
4529         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n",
4530             iphlen, *offset, length, (void *)stcb);
4531
4532         if (stcb) {
4533                 SCTP_TCB_LOCK_ASSERT(stcb);
4534         }
4535         /* validate chunk header length... */
4536         if (ntohs(ch->chunk_length) < sizeof(*ch)) {
4537                 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n",
4538                     ntohs(ch->chunk_length));
4539                 *offset = length;
4540                 return (stcb);
4541         }
4542         /*
4543          * validate the verification tag
4544          */
4545         vtag_in = ntohl(sh->v_tag);
4546
4547         if (ch->chunk_type == SCTP_INITIATION) {
4548                 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n",
4549                     ntohs(ch->chunk_length), vtag_in);
4550                 if (vtag_in != 0) {
4551                         /* protocol error- silently discard... */
4552                         SCTP_STAT_INCR(sctps_badvtag);
4553                         if (stcb != NULL) {
4554                                 SCTP_TCB_UNLOCK(stcb);
4555                         }
4556                         return (NULL);
4557                 }
4558         } else if (ch->chunk_type != SCTP_COOKIE_ECHO) {
4559                 /*
4560                  * If there is no stcb, skip the AUTH chunk and process
4561                  * later after a stcb is found (to validate the lookup was
4562                  * valid.
4563                  */
4564                 if ((ch->chunk_type == SCTP_AUTHENTICATION) &&
4565                     (stcb == NULL) &&
4566                     (inp->auth_supported == 1)) {
4567                         /* save this chunk for later processing */
4568                         auth_skipped = 1;
4569                         auth_offset = *offset;
4570                         auth_len = ntohs(ch->chunk_length);
4571
4572                         /* (temporarily) move past this chunk */
4573                         *offset += SCTP_SIZE32(auth_len);
4574                         if (*offset >= length) {
4575                                 /* no more data left in the mbuf chain */
4576                                 *offset = length;
4577                                 return (NULL);
4578                         }
4579                         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4580                             sizeof(struct sctp_chunkhdr), chunk_buf);
4581                 }
4582                 if (ch == NULL) {
4583                         /* Help */
4584                         *offset = length;
4585                         return (stcb);
4586                 }
4587                 if (ch->chunk_type == SCTP_COOKIE_ECHO) {
4588                         goto process_control_chunks;
4589                 }
4590                 /*
4591                  * first check if it's an ASCONF with an unknown src addr we
4592                  * need to look inside to find the association
4593                  */
4594                 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) {
4595                         struct sctp_chunkhdr *asconf_ch = ch;
4596                         uint32_t asconf_offset = 0, asconf_len = 0;
4597
4598                         /* inp's refcount may be reduced */
4599                         SCTP_INP_INCR_REF(inp);
4600
4601                         asconf_offset = *offset;
4602                         do {
4603                                 asconf_len = ntohs(asconf_ch->chunk_length);
4604                                 if (asconf_len < sizeof(struct sctp_asconf_paramhdr))
4605                                         break;
4606                                 stcb = sctp_findassociation_ep_asconf(m,
4607                                     *offset,
4608                                     dst,
4609                                     sh, &inp, netp, vrf_id);
4610                                 if (stcb != NULL)
4611                                         break;
4612                                 asconf_offset += SCTP_SIZE32(asconf_len);
4613                                 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset,
4614                                     sizeof(struct sctp_chunkhdr), chunk_buf);
4615                         } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF);
4616                         if (stcb == NULL) {
4617                                 /*
4618                                  * reduce inp's refcount if not reduced in
4619                                  * sctp_findassociation_ep_asconf().
4620                                  */
4621                                 SCTP_INP_DECR_REF(inp);
4622                         }
4623                         /* now go back and verify any auth chunk to be sure */
4624                         if (auth_skipped && (stcb != NULL)) {
4625                                 struct sctp_auth_chunk *auth;
4626
4627                                 auth = (struct sctp_auth_chunk *)
4628                                     sctp_m_getptr(m, auth_offset,
4629                                     auth_len, chunk_buf);
4630                                 got_auth = 1;
4631                                 auth_skipped = 0;
4632                                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m,
4633                                     auth_offset)) {
4634                                         /* auth HMAC failed so dump it */
4635                                         *offset = length;
4636                                         return (stcb);
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                         return (NULL);
4653                 }
4654                 asoc = &stcb->asoc;
4655                 /* ABORT and SHUTDOWN can use either v_tag... */
4656                 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) ||
4657                     (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) ||
4658                     (ch->chunk_type == SCTP_PACKET_DROPPED)) {
4659                         /* Take the T-bit always into account. */
4660                         if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) &&
4661                             (vtag_in == asoc->my_vtag)) ||
4662                             (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) &&
4663                             (asoc->peer_vtag != htonl(0)) &&
4664                             (vtag_in == asoc->peer_vtag))) {
4665                                 /* this is valid */
4666                         } else {
4667                                 /* drop this packet... */
4668                                 SCTP_STAT_INCR(sctps_badvtag);
4669                                 if (stcb != NULL) {
4670                                         SCTP_TCB_UNLOCK(stcb);
4671                                 }
4672                                 return (NULL);
4673                         }
4674                 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
4675                         if (vtag_in != asoc->my_vtag) {
4676                                 /*
4677                                  * this could be a stale SHUTDOWN-ACK or the
4678                                  * peer never got the SHUTDOWN-COMPLETE and
4679                                  * is still hung; we have started a new asoc
4680                                  * but it won't complete until the shutdown
4681                                  * is completed
4682                                  */
4683                                 if (stcb != NULL) {
4684                                         SCTP_TCB_UNLOCK(stcb);
4685                                 }
4686                                 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
4687                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
4688                                     msg);
4689                                 sctp_handle_ootb(m, iphlen, *offset, src, dst,
4690                                     sh, inp, op_err,
4691                                     mflowtype, mflowid, fibnum,
4692                                     vrf_id, port);
4693                                 return (NULL);
4694                         }
4695                 } else {
4696                         /* for all other chunks, vtag must match */
4697                         if (vtag_in != asoc->my_vtag) {
4698                                 /* invalid vtag... */
4699                                 SCTPDBG(SCTP_DEBUG_INPUT3,
4700                                     "invalid vtag: %xh, expect %xh\n",
4701                                     vtag_in, asoc->my_vtag);
4702                                 SCTP_STAT_INCR(sctps_badvtag);
4703                                 if (stcb != NULL) {
4704                                         SCTP_TCB_UNLOCK(stcb);
4705                                 }
4706                                 *offset = length;
4707                                 return (NULL);
4708                         }
4709                 }
4710         }                       /* end if !SCTP_COOKIE_ECHO */
4711         /*
4712          * process all control chunks...
4713          */
4714         if (((ch->chunk_type == SCTP_SELECTIVE_ACK) ||
4715             (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) ||
4716             (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) &&
4717             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) {
4718                 /* implied cookie-ack.. we must have lost the ack */
4719                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
4720                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
4721                             stcb->asoc.overall_error_count,
4722                             0,
4723                             SCTP_FROM_SCTP_INPUT,
4724                             __LINE__);
4725                 }
4726                 stcb->asoc.overall_error_count = 0;
4727                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb,
4728                     *netp);
4729         }
4730 process_control_chunks:
4731         while (IS_SCTP_CONTROL(ch)) {
4732                 /* validate chunk length */
4733                 chk_length = ntohs(ch->chunk_length);
4734                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n",
4735                     ch->chunk_type, chk_length);
4736                 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length);
4737                 if (chk_length < sizeof(*ch) ||
4738                     (*offset + (int)chk_length) > length) {
4739                         *offset = length;
4740                         return (stcb);
4741                 }
4742                 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks);
4743                 /*
4744                  * INIT-ACK only gets the init ack "header" portion only
4745                  * because we don't have to process the peer's COOKIE. All
4746                  * others get a complete chunk.
4747                  */
4748                 if ((ch->chunk_type == SCTP_INITIATION_ACK) ||
4749                     (ch->chunk_type == SCTP_INITIATION)) {
4750                         /* get an init-ack chunk */
4751                         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4752                             sizeof(struct sctp_init_ack_chunk), chunk_buf);
4753                         if (ch == NULL) {
4754                                 *offset = length;
4755                                 if (stcb != NULL) {
4756                                         SCTP_TCB_UNLOCK(stcb);
4757                                 }
4758                                 return (NULL);
4759                         }
4760                 } else {
4761                         /* For cookies and all other chunks. */
4762                         if (chk_length > sizeof(chunk_buf)) {
4763                                 /*
4764                                  * use just the size of the chunk buffer so
4765                                  * the front part of our chunks fit in
4766                                  * contiguous space up to the chunk buffer
4767                                  * size (508 bytes). For chunks that need to
4768                                  * get more than that they must use the
4769                                  * sctp_m_getptr() function or other means
4770                                  * (e.g. know how to parse mbuf chains).
4771                                  * Cookies do this already.
4772                                  */
4773                                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4774                                     (sizeof(chunk_buf) - 4),
4775                                     chunk_buf);
4776                                 if (ch == NULL) {
4777                                         *offset = length;
4778                                         if (stcb != NULL) {
4779                                                 SCTP_TCB_UNLOCK(stcb);
4780                                         }
4781                                         return (NULL);
4782                                 }
4783                         } else {
4784                                 /* We can fit it all */
4785                                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4786                                     chk_length, chunk_buf);
4787                                 if (ch == NULL) {
4788                                         SCTP_PRINTF("sctp_process_control: Can't get the all data....\n");
4789                                         *offset = length;
4790                                         if (stcb != NULL) {
4791                                                 SCTP_TCB_UNLOCK(stcb);
4792                                         }
4793                                         return (NULL);
4794                                 }
4795                         }
4796                 }
4797                 num_chunks++;
4798                 /* Save off the last place we got a control from */
4799                 if (stcb != NULL) {
4800                         if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) {
4801                                 /*
4802                                  * allow last_control to be NULL if
4803                                  * ASCONF... ASCONF processing will find the
4804                                  * right net later
4805                                  */
4806                                 if ((netp != NULL) && (*netp != NULL))
4807                                         stcb->asoc.last_control_chunk_from = *netp;
4808                         }
4809                 }
4810 #ifdef SCTP_AUDITING_ENABLED
4811                 sctp_audit_log(0xB0, ch->chunk_type);
4812 #endif
4813
4814                 /* check to see if this chunk required auth, but isn't */
4815                 if ((stcb != NULL) &&
4816                     (stcb->asoc.auth_supported == 1) &&
4817                     sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) &&
4818                     !stcb->asoc.authenticated) {
4819                         /* "silently" ignore */
4820                         SCTP_STAT_INCR(sctps_recvauthmissing);
4821                         goto next_chunk;
4822                 }
4823                 switch (ch->chunk_type) {
4824                 case SCTP_INITIATION:
4825                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n");
4826                         /* The INIT chunk must be the only chunk. */
4827                         if ((num_chunks > 1) ||
4828                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4829                                 /* RFC 4960 requires that no ABORT is sent */
4830                                 *offset = length;
4831                                 if (stcb != NULL) {
4832                                         SCTP_TCB_UNLOCK(stcb);
4833                                 }
4834                                 return (NULL);
4835                         }
4836                         /* Honor our resource limit. */
4837                         if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) {
4838                                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
4839                                 sctp_abort_association(inp, stcb, m, iphlen,
4840                                     src, dst, sh, op_err,
4841                                     mflowtype, mflowid,
4842                                     vrf_id, port);
4843                                 *offset = length;
4844                                 return (NULL);
4845                         }
4846                         sctp_handle_init(m, iphlen, *offset, src, dst, sh,
4847                             (struct sctp_init_chunk *)ch, inp,
4848                             stcb, *netp, &abort_no_unlock,
4849                             mflowtype, mflowid,
4850                             vrf_id, port);
4851                         *offset = length;
4852                         if ((!abort_no_unlock) && (stcb != NULL)) {
4853                                 SCTP_TCB_UNLOCK(stcb);
4854                         }
4855                         return (NULL);
4856                         break;
4857                 case SCTP_PAD_CHUNK:
4858                         break;
4859                 case SCTP_INITIATION_ACK:
4860                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT-ACK\n");
4861                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4862                                 /* We are not interested anymore */
4863                                 if ((stcb != NULL) && (stcb->asoc.total_output_queue_size)) {
4864                                         ;
4865                                 } else {
4866                                         if (stcb != NULL) {
4867                                                 SCTP_TCB_UNLOCK(stcb);
4868                                         }
4869                                         *offset = length;
4870                                         if (stcb != NULL) {
4871 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4872                                                 so = SCTP_INP_SO(inp);
4873                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4874                                                 SCTP_TCB_UNLOCK(stcb);
4875                                                 SCTP_SOCKET_LOCK(so, 1);
4876                                                 SCTP_TCB_LOCK(stcb);
4877                                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4878 #endif
4879                                                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
4880                                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_29);
4881 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4882                                                 SCTP_SOCKET_UNLOCK(so, 1);
4883 #endif
4884                                         }
4885                                         return (NULL);
4886                                 }
4887                         }
4888                         /* The INIT-ACK chunk must be the only chunk. */
4889                         if ((num_chunks > 1) ||
4890                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4891                                 *offset = length;
4892                                 return (stcb);
4893                         }
4894                         if ((netp) && (*netp)) {
4895                                 ret = sctp_handle_init_ack(m, iphlen, *offset,
4896                                     src, dst, sh,
4897                                     (struct sctp_init_ack_chunk *)ch,
4898                                     stcb, *netp,
4899                                     &abort_no_unlock,
4900                                     mflowtype, mflowid,
4901                                     vrf_id);
4902                         } else {
4903                                 ret = -1;
4904                         }
4905                         *offset = length;
4906                         if (abort_no_unlock) {
4907                                 return (NULL);
4908                         }
4909                         /*
4910                          * Special case, I must call the output routine to
4911                          * get the cookie echoed
4912                          */
4913                         if ((stcb != NULL) && (ret == 0)) {
4914                                 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
4915                         }
4916                         return (stcb);
4917                         break;
4918                 case SCTP_SELECTIVE_ACK:
4919                         {
4920                                 struct sctp_sack_chunk *sack;
4921                                 int abort_now = 0;
4922                                 uint32_t a_rwnd, cum_ack;
4923                                 uint16_t num_seg, num_dup;
4924                                 uint8_t flags;
4925                                 int offset_seg, offset_dup;
4926
4927                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK\n");
4928                                 SCTP_STAT_INCR(sctps_recvsacks);
4929                                 if (stcb == NULL) {
4930                                         SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing SACK chunk\n");
4931                                         break;
4932                                 }
4933                                 if (chk_length < sizeof(struct sctp_sack_chunk)) {
4934                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n");
4935                                         break;
4936                                 }
4937                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
4938                                         /*-
4939                                          * If we have sent a shutdown-ack, we will pay no
4940                                          * attention to a sack sent in to us since
4941                                          * we don't care anymore.
4942                                          */
4943                                         break;
4944                                 }
4945                                 sack = (struct sctp_sack_chunk *)ch;
4946                                 flags = ch->chunk_flags;
4947                                 cum_ack = ntohl(sack->sack.cum_tsn_ack);
4948                                 num_seg = ntohs(sack->sack.num_gap_ack_blks);
4949                                 num_dup = ntohs(sack->sack.num_dup_tsns);
4950                                 a_rwnd = (uint32_t)ntohl(sack->sack.a_rwnd);
4951                                 if (sizeof(struct sctp_sack_chunk) +
4952                                     num_seg * sizeof(struct sctp_gap_ack_block) +
4953                                     num_dup * sizeof(uint32_t) != chk_length) {
4954                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n");
4955                                         break;
4956                                 }
4957                                 offset_seg = *offset + sizeof(struct sctp_sack_chunk);
4958                                 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
4959                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n",
4960                                     cum_ack, num_seg, a_rwnd);
4961                                 stcb->asoc.seen_a_sack_this_pkt = 1;
4962                                 if ((stcb->asoc.pr_sctp_cnt == 0) &&
4963                                     (num_seg == 0) &&
4964                                     SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
4965                                     (stcb->asoc.saw_sack_with_frags == 0) &&
4966                                     (stcb->asoc.saw_sack_with_nr_frags == 0) &&
4967                                     (!TAILQ_EMPTY(&stcb->asoc.sent_queue))
4968                                     ) {
4969                                         /*
4970                                          * We have a SIMPLE sack having no
4971                                          * prior segments and data on sent
4972                                          * queue to be acked.. Use the
4973                                          * faster path sack processing. We
4974                                          * also allow window update sacks
4975                                          * with no missing segments to go
4976                                          * this way too.
4977                                          */
4978                                         sctp_express_handle_sack(stcb, cum_ack, a_rwnd, &abort_now, ecne_seen);
4979                                 } else {
4980                                         if (netp && *netp)
4981                                                 sctp_handle_sack(m, offset_seg, offset_dup, stcb,
4982                                                     num_seg, 0, num_dup, &abort_now, flags,
4983                                                     cum_ack, a_rwnd, ecne_seen);
4984                                 }
4985                                 if (abort_now) {
4986                                         /* ABORT signal from sack processing */
4987                                         *offset = length;
4988                                         return (NULL);
4989                                 }
4990                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
4991                                     TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
4992                                     (stcb->asoc.stream_queue_cnt == 0)) {
4993                                         sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
4994                                 }
4995                         }
4996                         break;
4997                         /*
4998                          * EY - nr_sack:  If the received chunk is an
4999                          * nr_sack chunk
5000                          */
5001                 case SCTP_NR_SELECTIVE_ACK:
5002                         {
5003                                 struct sctp_nr_sack_chunk *nr_sack;
5004                                 int abort_now = 0;
5005                                 uint32_t a_rwnd, cum_ack;
5006                                 uint16_t num_seg, num_nr_seg, num_dup;
5007                                 uint8_t flags;
5008                                 int offset_seg, offset_dup;
5009
5010                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK\n");
5011                                 SCTP_STAT_INCR(sctps_recvsacks);
5012                                 if (stcb == NULL) {
5013                                         SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing NR-SACK chunk\n");
5014                                         break;
5015                                 }
5016                                 if (stcb->asoc.nrsack_supported == 0) {
5017                                         goto unknown_chunk;
5018                                 }
5019                                 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) {
5020                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR-SACK chunk, too small\n");
5021                                         break;
5022                                 }
5023                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
5024                                         /*-
5025                                          * If we have sent a shutdown-ack, we will pay no
5026                                          * attention to a sack sent in to us since
5027                                          * we don't care anymore.
5028                                          */
5029                                         break;
5030                                 }
5031                                 nr_sack = (struct sctp_nr_sack_chunk *)ch;
5032                                 flags = ch->chunk_flags;
5033                                 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack);
5034                                 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks);
5035                                 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks);
5036                                 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns);
5037                                 a_rwnd = (uint32_t)ntohl(nr_sack->nr_sack.a_rwnd);
5038                                 if (sizeof(struct sctp_nr_sack_chunk) +
5039                                     (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) +
5040                                     num_dup * sizeof(uint32_t) != chk_length) {
5041                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n");
5042                                         break;
5043                                 }
5044                                 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk);
5045                                 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
5046                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n",
5047                                     cum_ack, num_seg, a_rwnd);
5048                                 stcb->asoc.seen_a_sack_this_pkt = 1;
5049                                 if ((stcb->asoc.pr_sctp_cnt == 0) &&
5050                                     (num_seg == 0) && (num_nr_seg == 0) &&
5051                                     SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
5052                                     (stcb->asoc.saw_sack_with_frags == 0) &&
5053                                     (stcb->asoc.saw_sack_with_nr_frags == 0) &&
5054                                     (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
5055                                         /*
5056                                          * We have a SIMPLE sack having no
5057                                          * prior segments and data on sent
5058                                          * queue to be acked. Use the faster
5059                                          * path sack processing. We also
5060                                          * allow window update sacks with no
5061                                          * missing segments to go this way
5062                                          * too.
5063                                          */
5064                                         sctp_express_handle_sack(stcb, cum_ack, a_rwnd,
5065                                             &abort_now, ecne_seen);
5066                                 } else {
5067                                         if (netp && *netp)
5068                                                 sctp_handle_sack(m, offset_seg, offset_dup, stcb,
5069                                                     num_seg, num_nr_seg, num_dup, &abort_now, flags,
5070                                                     cum_ack, a_rwnd, ecne_seen);
5071                                 }
5072                                 if (abort_now) {
5073                                         /* ABORT signal from sack processing */
5074                                         *offset = length;
5075                                         return (NULL);
5076                                 }
5077                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
5078                                     TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
5079                                     (stcb->asoc.stream_queue_cnt == 0)) {
5080                                         sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
5081                                 }
5082                         }
5083                         break;
5084
5085                 case SCTP_HEARTBEAT_REQUEST:
5086                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n");
5087                         if ((stcb) && netp && *netp) {
5088                                 SCTP_STAT_INCR(sctps_recvheartbeat);
5089                                 sctp_send_heartbeat_ack(stcb, m, *offset,
5090                                     chk_length, *netp);
5091
5092                                 /* He's alive so give him credit */
5093                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5094                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5095                                             stcb->asoc.overall_error_count,
5096                                             0,
5097                                             SCTP_FROM_SCTP_INPUT,
5098                                             __LINE__);
5099                                 }
5100                                 stcb->asoc.overall_error_count = 0;
5101                         }
5102                         break;
5103                 case SCTP_HEARTBEAT_ACK:
5104                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT-ACK\n");
5105                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) {
5106                                 /* Its not ours */
5107                                 *offset = length;
5108                                 return (stcb);
5109                         }
5110                         /* He's alive so give him credit */
5111                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5112                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5113                                     stcb->asoc.overall_error_count,
5114                                     0,
5115                                     SCTP_FROM_SCTP_INPUT,
5116                                     __LINE__);
5117                         }
5118                         stcb->asoc.overall_error_count = 0;
5119                         SCTP_STAT_INCR(sctps_recvheartbeatack);
5120                         if (netp && *netp)
5121                                 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch,
5122                                     stcb, *netp);
5123                         break;
5124                 case SCTP_ABORT_ASSOCIATION:
5125                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n",
5126                             (void *)stcb);
5127                         if ((stcb) && netp && *netp)
5128                                 sctp_handle_abort((struct sctp_abort_chunk *)ch,
5129                                     stcb, *netp);
5130                         *offset = length;
5131                         return (NULL);
5132                         break;
5133                 case SCTP_SHUTDOWN:
5134                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n",
5135                             (void *)stcb);
5136                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) {
5137                                 *offset = length;
5138                                 return (stcb);
5139                         }
5140                         if (netp && *netp) {
5141                                 int abort_flag = 0;
5142
5143                                 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch,
5144                                     stcb, *netp, &abort_flag);
5145                                 if (abort_flag) {
5146                                         *offset = length;
5147                                         return (NULL);
5148                                 }
5149                         }
5150                         break;
5151                 case SCTP_SHUTDOWN_ACK:
5152                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-ACK, stcb %p\n", (void *)stcb);
5153                         if ((stcb) && (netp) && (*netp))
5154                                 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp);
5155                         *offset = length;
5156                         return (NULL);
5157                         break;
5158
5159                 case SCTP_OPERATION_ERROR:
5160                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP-ERR\n");
5161                         if ((stcb) && netp && *netp && sctp_handle_error(ch, stcb, *netp) < 0) {
5162                                 *offset = length;
5163                                 return (NULL);
5164                         }
5165                         break;
5166                 case SCTP_COOKIE_ECHO:
5167                         SCTPDBG(SCTP_DEBUG_INPUT3,
5168                             "SCTP_COOKIE-ECHO, stcb %p\n", (void *)stcb);
5169                         if ((stcb) && (stcb->asoc.total_output_queue_size)) {
5170                                 ;
5171                         } else {
5172                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5173                                         /* We are not interested anymore */
5174                         abend:
5175                                         if (stcb != NULL) {
5176                                                 SCTP_TCB_UNLOCK(stcb);
5177                                         }
5178                                         *offset = length;
5179                                         return (NULL);
5180                                 }
5181                         }
5182                         /*-
5183                          * First are we accepting? We do this again here
5184                          * since it is possible that a previous endpoint WAS
5185                          * listening responded to a INIT-ACK and then
5186                          * closed. We opened and bound.. and are now no
5187                          * longer listening.
5188                          *
5189                          * XXXGL: notes on checking listen queue length.
5190                          * 1) SCTP_IS_LISTENING() doesn't necessarily mean
5191                          *    SOLISTENING(), because a listening "UDP type"
5192                          *    socket isn't listening in terms of the socket
5193                          *    layer.  It is a normal data flow socket, that
5194                          *    can fork off new connections.  Thus, we should
5195                          *    look into sol_qlen only in case we are !UDP.
5196                          * 2) Checking sol_qlen in general requires locking
5197                          *    the socket, and this code lacks that.
5198                          */
5199                         if ((stcb == NULL) &&
5200                             (!SCTP_IS_LISTENING(inp) ||
5201                             (!(inp->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE) &&
5202                             inp->sctp_socket->sol_qlen >= inp->sctp_socket->sol_qlimit))) {
5203                                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
5204                                     (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) {
5205                                         op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
5206                                         sctp_abort_association(inp, stcb, m, iphlen,
5207                                             src, dst, sh, op_err,
5208                                             mflowtype, mflowid,
5209                                             vrf_id, port);
5210                                 }
5211                                 *offset = length;
5212                                 return (NULL);
5213                         } else {
5214                                 struct mbuf *ret_buf;
5215                                 struct sctp_inpcb *linp;
5216
5217                                 if (stcb) {
5218                                         linp = NULL;
5219                                 } else {
5220                                         linp = inp;
5221                                 }
5222
5223                                 if (linp) {
5224                                         SCTP_ASOC_CREATE_LOCK(linp);
5225                                         if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
5226                                             (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
5227                                                 SCTP_ASOC_CREATE_UNLOCK(linp);
5228                                                 goto abend;
5229                                         }
5230                                 }
5231                                 if (netp) {
5232                                         struct sctp_tcb *locked_stcb;
5233
5234                                         locked_stcb = stcb;
5235                                         ret_buf =
5236                                             sctp_handle_cookie_echo(m, iphlen,
5237                                             *offset,
5238                                             src, dst,
5239                                             sh,
5240                                             (struct sctp_cookie_echo_chunk *)ch,
5241                                             &inp, &stcb, netp,
5242                                             auth_skipped,
5243                                             auth_offset,
5244                                             auth_len,
5245                                             &locked_stcb,
5246                                             mflowtype,
5247                                             mflowid,
5248                                             vrf_id,
5249                                             port);
5250                                         if ((locked_stcb != NULL) && (locked_stcb != stcb)) {
5251                                                 SCTP_TCB_UNLOCK(locked_stcb);
5252                                         }
5253                                         if (stcb != NULL) {
5254                                                 SCTP_TCB_LOCK_ASSERT(stcb);
5255                                         }
5256                                 } else {
5257                                         ret_buf = NULL;
5258                                 }
5259                                 if (linp) {
5260                                         SCTP_ASOC_CREATE_UNLOCK(linp);
5261                                 }
5262                                 if (ret_buf == NULL) {
5263                                         if (stcb != NULL) {
5264                                                 SCTP_TCB_UNLOCK(stcb);
5265                                         }
5266                                         SCTPDBG(SCTP_DEBUG_INPUT3,
5267                                             "GAK, null buffer\n");
5268                                         *offset = length;
5269                                         return (NULL);
5270                                 }
5271                                 /* if AUTH skipped, see if it verified... */
5272                                 if (auth_skipped) {
5273                                         got_auth = 1;
5274                                         auth_skipped = 0;
5275                                 }
5276                                 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) {
5277                                         /*
5278                                          * Restart the timer if we have
5279                                          * pending data
5280                                          */
5281                                         struct sctp_tmit_chunk *chk;
5282
5283                                         chk = TAILQ_FIRST(&stcb->asoc.sent_queue);
5284                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
5285                                 }
5286                         }
5287                         break;
5288                 case SCTP_COOKIE_ACK:
5289                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE-ACK, stcb %p\n", (void *)stcb);
5290                         if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) {
5291                                 return (stcb);
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                                 *offset = length;
5334                                 return (stcb);
5335                         }
5336                         if (stcb) {
5337                                 if (stcb->asoc.ecn_supported == 0) {
5338                                         goto unknown_chunk;
5339                                 }
5340                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5341                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5342                                             stcb->asoc.overall_error_count,
5343                                             0,
5344                                             SCTP_FROM_SCTP_INPUT,
5345                                             __LINE__);
5346                                 }
5347                                 stcb->asoc.overall_error_count = 0;
5348                                 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch,
5349                                     stcb);
5350                                 ecne_seen = 1;
5351                         }
5352                         break;
5353                 case SCTP_ECN_CWR:
5354                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-CWR\n");
5355                         /* He's alive so give him credit */
5356                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) {
5357                                 *offset = length;
5358                                 return (stcb);
5359                         }
5360                         if (stcb) {
5361                                 if (stcb->asoc.ecn_supported == 0) {
5362                                         goto unknown_chunk;
5363                                 }
5364                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5365                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5366                                             stcb->asoc.overall_error_count,
5367                                             0,
5368                                             SCTP_FROM_SCTP_INPUT,
5369                                             __LINE__);
5370                                 }
5371                                 stcb->asoc.overall_error_count = 0;
5372                                 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp);
5373                         }
5374                         break;
5375                 case SCTP_SHUTDOWN_COMPLETE:
5376                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-COMPLETE, stcb %p\n", (void *)stcb);
5377                         /* must be first and only chunk */
5378                         if ((num_chunks > 1) ||
5379                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
5380                                 *offset = length;
5381                                 return (stcb);
5382                         }
5383                         if ((stcb) && netp && *netp) {
5384                                 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch,
5385                                     stcb, *netp);
5386                         }
5387                         *offset = length;
5388                         return (NULL);
5389                         break;
5390                 case SCTP_ASCONF:
5391                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n");
5392                         /* He's alive so give him credit */
5393                         if (stcb) {
5394                                 if (stcb->asoc.asconf_supported == 0) {
5395                                         goto unknown_chunk;
5396                                 }
5397                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5398                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5399                                             stcb->asoc.overall_error_count,
5400                                             0,
5401                                             SCTP_FROM_SCTP_INPUT,
5402                                             __LINE__);
5403                                 }
5404                                 stcb->asoc.overall_error_count = 0;
5405                                 sctp_handle_asconf(m, *offset, src,
5406                                     (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0);
5407                                 asconf_cnt++;
5408                         }
5409                         break;
5410                 case SCTP_ASCONF_ACK:
5411                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF-ACK\n");
5412                         if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) {
5413                                 /* Its not ours */
5414                                 *offset = length;
5415                                 return (stcb);
5416                         }
5417                         if ((stcb) && netp && *netp) {
5418                                 if (stcb->asoc.asconf_supported == 0) {
5419                                         goto unknown_chunk;
5420                                 }
5421                                 /* He's alive so give him credit */
5422                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5423                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5424                                             stcb->asoc.overall_error_count,
5425                                             0,
5426                                             SCTP_FROM_SCTP_INPUT,
5427                                             __LINE__);
5428                                 }
5429                                 stcb->asoc.overall_error_count = 0;
5430                                 sctp_handle_asconf_ack(m, *offset,
5431                                     (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock);
5432                                 if (abort_no_unlock)
5433                                         return (NULL);
5434                         }
5435                         break;
5436                 case SCTP_FORWARD_CUM_TSN:
5437                 case SCTP_IFORWARD_CUM_TSN:
5438                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD-TSN\n");
5439                         if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) {
5440                                 /* Its not ours */
5441                                 *offset = length;
5442                                 return (stcb);
5443                         }
5444                         /* He's alive so give him credit */
5445                         if (stcb) {
5446                                 int abort_flag = 0;
5447
5448                                 if (stcb->asoc.prsctp_supported == 0) {
5449                                         goto unknown_chunk;
5450                                 }
5451                                 stcb->asoc.overall_error_count = 0;
5452                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5453                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5454                                             stcb->asoc.overall_error_count,
5455                                             0,
5456                                             SCTP_FROM_SCTP_INPUT,
5457                                             __LINE__);
5458                                 }
5459                                 *fwd_tsn_seen = 1;
5460                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5461                                         /* We are not interested anymore */
5462 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5463                                         so = SCTP_INP_SO(inp);
5464                                         atomic_add_int(&stcb->asoc.refcnt, 1);
5465                                         SCTP_TCB_UNLOCK(stcb);
5466                                         SCTP_SOCKET_LOCK(so, 1);
5467                                         SCTP_TCB_LOCK(stcb);
5468                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
5469 #endif
5470                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
5471                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_31);
5472 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5473                                         SCTP_SOCKET_UNLOCK(so, 1);
5474 #endif
5475                                         *offset = length;
5476                                         return (NULL);
5477                                 }
5478                                 /*
5479                                  * For sending a SACK this looks like DATA
5480                                  * chunks.
5481                                  */
5482                                 stcb->asoc.last_data_chunk_from = stcb->asoc.last_control_chunk_from;
5483                                 sctp_handle_forward_tsn(stcb,
5484                                     (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset);
5485                                 if (abort_flag) {
5486                                         *offset = length;
5487                                         return (NULL);
5488                                 } else {
5489                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5490                                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5491                                                     stcb->asoc.overall_error_count,
5492                                                     0,
5493                                                     SCTP_FROM_SCTP_INPUT,
5494                                                     __LINE__);
5495                                         }
5496                                         stcb->asoc.overall_error_count = 0;
5497                                 }
5498
5499                         }
5500                         break;
5501                 case SCTP_STREAM_RESET:
5502                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n");
5503                         if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) {
5504                                 /* Its not ours */
5505                                 *offset = length;
5506                                 return (stcb);
5507                         }
5508                         if (stcb->asoc.reconfig_supported == 0) {
5509                                 goto unknown_chunk;
5510                         }
5511                         if (sctp_handle_stream_reset(stcb, m, *offset, ch)) {
5512                                 /* stop processing */
5513                                 *offset = length;
5514                                 return (NULL);
5515                         }
5516                         break;
5517                 case SCTP_PACKET_DROPPED:
5518                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n");
5519                         /* re-get it all please */
5520                         if (chk_length < sizeof(struct sctp_pktdrop_chunk)) {
5521                                 /* Its not ours */
5522                                 *offset = length;
5523                                 return (stcb);
5524                         }
5525                         if (ch && (stcb) && netp && (*netp)) {
5526                                 if (stcb->asoc.pktdrop_supported == 0) {
5527                                         goto unknown_chunk;
5528                                 }
5529                                 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch,
5530                                     stcb, *netp,
5531                                     min(chk_length, (sizeof(chunk_buf) - 4)));
5532                         }
5533                         break;
5534                 case SCTP_AUTHENTICATION:
5535                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n");
5536                         if (stcb == NULL) {
5537                                 /* save the first AUTH for later processing */
5538                                 if (auth_skipped == 0) {
5539                                         auth_offset = *offset;
5540                                         auth_len = chk_length;
5541                                         auth_skipped = 1;
5542                                 }
5543                                 /* skip this chunk (temporarily) */
5544                                 goto next_chunk;
5545                         }
5546                         if (stcb->asoc.auth_supported == 0) {
5547                                 goto unknown_chunk;
5548                         }
5549                         if ((chk_length < (sizeof(struct sctp_auth_chunk))) ||
5550                             (chk_length > (sizeof(struct sctp_auth_chunk) +
5551                             SCTP_AUTH_DIGEST_LEN_MAX))) {
5552                                 /* Its not ours */
5553                                 *offset = length;
5554                                 return (stcb);
5555                         }
5556                         if (got_auth == 1) {
5557                                 /* skip this chunk... it's already auth'd */
5558                                 goto next_chunk;
5559                         }
5560                         got_auth = 1;
5561                         if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch,
5562                             m, *offset)) {
5563                                 /* auth HMAC failed so dump the packet */
5564                                 *offset = length;
5565                                 return (stcb);
5566                         } else {
5567                                 /* remaining chunks are HMAC checked */
5568                                 stcb->asoc.authenticated = 1;
5569                         }
5570                         break;
5571
5572                 default:
5573         unknown_chunk:
5574                         /* it's an unknown chunk! */
5575                         if ((ch->chunk_type & 0x40) && (stcb != NULL)) {
5576                                 struct sctp_gen_error_cause *cause;
5577                                 int len;
5578
5579                                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_gen_error_cause),
5580                                     0, M_NOWAIT, 1, MT_DATA);
5581                                 if (op_err != NULL) {
5582                                         len = min(SCTP_SIZE32(chk_length), (uint32_t)(length - *offset));
5583                                         cause = mtod(op_err, struct sctp_gen_error_cause *);
5584                                         cause->code = htons(SCTP_CAUSE_UNRECOG_CHUNK);
5585                                         cause->length = htons((uint16_t)(len + sizeof(struct sctp_gen_error_cause)));
5586                                         SCTP_BUF_LEN(op_err) = sizeof(struct sctp_gen_error_cause);
5587                                         SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(m, *offset, len, M_NOWAIT);
5588                                         if (SCTP_BUF_NEXT(op_err) != NULL) {
5589 #ifdef SCTP_MBUF_LOGGING
5590                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5591                                                         sctp_log_mbc(SCTP_BUF_NEXT(op_err), SCTP_MBUF_ICOPY);
5592                                                 }
5593 #endif
5594                                                 sctp_queue_op_err(stcb, op_err);
5595                                         } else {
5596                                                 sctp_m_freem(op_err);
5597                                         }
5598                                 }
5599                         }
5600                         if ((ch->chunk_type & 0x80) == 0) {
5601                                 /* discard this packet */
5602                                 *offset = length;
5603                                 return (stcb);
5604                         }       /* else skip this bad chunk and continue... */
5605                         break;
5606                 }               /* switch (ch->chunk_type) */
5607
5608
5609 next_chunk:
5610                 /* get the next chunk */
5611                 *offset += SCTP_SIZE32(chk_length);
5612                 if (*offset >= length) {
5613                         /* no more data left in the mbuf chain */
5614                         break;
5615                 }
5616                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
5617                     sizeof(struct sctp_chunkhdr), chunk_buf);
5618                 if (ch == NULL) {
5619                         *offset = length;
5620                         return (stcb);
5621                 }
5622         }                       /* while */
5623
5624         if (asconf_cnt > 0 && stcb != NULL) {
5625                 sctp_send_asconf_ack(stcb);
5626         }
5627         return (stcb);
5628 }
5629
5630
5631 /*
5632  * common input chunk processing (v4 and v6)
5633  */
5634 void
5635 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length,
5636     struct sockaddr *src, struct sockaddr *dst,
5637     struct sctphdr *sh, struct sctp_chunkhdr *ch,
5638 #if !defined(SCTP_WITH_NO_CSUM)
5639     uint8_t compute_crc,
5640 #endif
5641     uint8_t ecn_bits,
5642     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
5643     uint32_t vrf_id, uint16_t port)
5644 {
5645         uint32_t high_tsn;
5646         int fwd_tsn_seen = 0, data_processed = 0;
5647         struct mbuf *m = *mm, *op_err;
5648         char msg[SCTP_DIAG_INFO_LEN];
5649         int un_sent;
5650         int cnt_ctrl_ready = 0;
5651         struct sctp_inpcb *inp = NULL, *inp_decr = NULL;
5652         struct sctp_tcb *stcb = NULL;
5653         struct sctp_nets *net = NULL;
5654
5655         SCTP_STAT_INCR(sctps_recvdatagrams);
5656 #ifdef SCTP_AUDITING_ENABLED
5657         sctp_audit_log(0xE0, 1);
5658         sctp_auditing(0, inp, stcb, net);
5659 #endif
5660 #if !defined(SCTP_WITH_NO_CSUM)
5661         if (compute_crc != 0) {
5662                 uint32_t check, calc_check;
5663
5664                 check = sh->checksum;
5665                 sh->checksum = 0;
5666                 calc_check = sctp_calculate_cksum(m, iphlen);
5667                 sh->checksum = check;
5668                 if (calc_check != check) {
5669                         SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x  m:%p mlen:%d iphlen:%d\n",
5670                             calc_check, check, (void *)m, length, iphlen);
5671                         stcb = sctp_findassociation_addr(m, offset, src, dst,
5672                             sh, ch, &inp, &net, vrf_id);
5673 #if defined(INET) || defined(INET6)
5674                         if ((ch->chunk_type != SCTP_INITIATION) &&
5675                             (net != NULL) && (net->port != port)) {
5676                                 if (net->port == 0) {
5677                                         /* UDP encapsulation turned on. */
5678                                         net->mtu -= sizeof(struct udphdr);
5679                                         if (stcb->asoc.smallest_mtu > net->mtu) {
5680                                                 sctp_pathmtu_adjustment(stcb, net->mtu);
5681                                         }
5682                                 } else if (port == 0) {
5683                                         /* UDP encapsulation turned off. */
5684                                         net->mtu += sizeof(struct udphdr);
5685                                         /* XXX Update smallest_mtu */
5686                                 }
5687                                 net->port = port;
5688                         }
5689 #endif
5690                         if (net != NULL) {
5691                                 net->flowtype = mflowtype;
5692                                 net->flowid = mflowid;
5693                         }
5694                         if ((inp != NULL) && (stcb != NULL)) {
5695                                 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1);
5696                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED);
5697                         } else if ((inp != NULL) && (stcb == NULL)) {
5698                                 inp_decr = inp;
5699                         }
5700                         SCTP_STAT_INCR(sctps_badsum);
5701                         SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors);
5702                         goto out;
5703                 }
5704         }
5705 #endif
5706         /* Destination port of 0 is illegal, based on RFC4960. */
5707         if (sh->dest_port == 0) {
5708                 SCTP_STAT_INCR(sctps_hdrops);
5709                 goto out;
5710         }
5711         stcb = sctp_findassociation_addr(m, offset, src, dst,
5712             sh, ch, &inp, &net, vrf_id);
5713 #if defined(INET) || defined(INET6)
5714         if ((ch->chunk_type != SCTP_INITIATION) &&
5715             (net != NULL) && (net->port != port)) {
5716                 if (net->port == 0) {
5717                         /* UDP encapsulation turned on. */
5718                         net->mtu -= sizeof(struct udphdr);
5719                         if (stcb->asoc.smallest_mtu > net->mtu) {
5720                                 sctp_pathmtu_adjustment(stcb, net->mtu);
5721                         }
5722                 } else if (port == 0) {
5723                         /* UDP encapsulation turned off. */
5724                         net->mtu += sizeof(struct udphdr);
5725                         /* XXX Update smallest_mtu */
5726                 }
5727                 net->port = port;
5728         }
5729 #endif
5730         if (net != NULL) {
5731                 net->flowtype = mflowtype;
5732                 net->flowid = mflowid;
5733         }
5734         if (inp == NULL) {
5735                 SCTP_STAT_INCR(sctps_noport);
5736                 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) {
5737                         goto out;
5738                 }
5739                 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
5740                         sctp_send_shutdown_complete2(src, dst, sh,
5741                             mflowtype, mflowid, fibnum,
5742                             vrf_id, port);
5743                         goto out;
5744                 }
5745                 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) {
5746                         goto out;
5747                 }
5748                 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) {
5749                         if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) ||
5750                             ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) &&
5751                             (ch->chunk_type != SCTP_INIT))) {
5752                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5753                                     "Out of the blue");
5754                                 sctp_send_abort(m, iphlen, src, dst,
5755                                     sh, 0, op_err,
5756                                     mflowtype, mflowid, fibnum,
5757                                     vrf_id, port);
5758                         }
5759                 }
5760                 goto out;
5761         } else if (stcb == NULL) {
5762                 inp_decr = inp;
5763         }
5764         SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n",
5765             (void *)m, iphlen, offset, length, (void *)stcb);
5766         if (stcb) {
5767                 /* always clear this before beginning a packet */
5768                 stcb->asoc.authenticated = 0;
5769                 stcb->asoc.seen_a_sack_this_pkt = 0;
5770                 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n",
5771                     (void *)stcb, stcb->asoc.state);
5772
5773                 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) ||
5774                     (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) {
5775                         /*-
5776                          * If we hit here, we had a ref count
5777                          * up when the assoc was aborted and the
5778                          * timer is clearing out the assoc, we should
5779                          * NOT respond to any packet.. its OOTB.
5780                          */
5781                         SCTP_TCB_UNLOCK(stcb);
5782                         stcb = NULL;
5783                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5784                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5785                             msg);
5786                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5787                             mflowtype, mflowid, inp->fibnum,
5788                             vrf_id, port);
5789                         goto out;
5790                 }
5791         }
5792         if (IS_SCTP_CONTROL(ch)) {
5793                 /* process the control portion of the SCTP packet */
5794                 /* sa_ignore NO_NULL_CHK */
5795                 stcb = sctp_process_control(m, iphlen, &offset, length,
5796                     src, dst, sh, ch,
5797                     inp, stcb, &net, &fwd_tsn_seen,
5798                     mflowtype, mflowid, fibnum,
5799                     vrf_id, port);
5800                 if (stcb) {
5801                         /*
5802                          * This covers us if the cookie-echo was there and
5803                          * it changes our INP.
5804                          */
5805                         inp = stcb->sctp_ep;
5806 #if defined(INET) || defined(INET6)
5807                         if ((ch->chunk_type != SCTP_INITIATION) &&
5808                             (net != NULL) && (net->port != port)) {
5809                                 if (net->port == 0) {
5810                                         /* UDP encapsulation turned on. */
5811                                         net->mtu -= sizeof(struct udphdr);
5812                                         if (stcb->asoc.smallest_mtu > net->mtu) {
5813                                                 sctp_pathmtu_adjustment(stcb, net->mtu);
5814                                         }
5815                                 } else if (port == 0) {
5816                                         /* UDP encapsulation turned off. */
5817                                         net->mtu += sizeof(struct udphdr);
5818                                         /* XXX Update smallest_mtu */
5819                                 }
5820                                 net->port = port;
5821                         }
5822 #endif
5823                 }
5824         } else {
5825                 /*
5826                  * no control chunks, so pre-process DATA chunks (these
5827                  * checks are taken care of by control processing)
5828                  */
5829
5830                 /*
5831                  * if DATA only packet, and auth is required, then punt...
5832                  * can't have authenticated without any AUTH (control)
5833                  * chunks
5834                  */
5835                 if ((stcb != NULL) &&
5836                     (stcb->asoc.auth_supported == 1) &&
5837                     sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) {
5838                         /* "silently" ignore */
5839                         SCTP_STAT_INCR(sctps_recvauthmissing);
5840                         goto out;
5841                 }
5842                 if (stcb == NULL) {
5843                         /* out of the blue DATA chunk */
5844                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5845                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5846                             msg);
5847                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5848                             mflowtype, mflowid, fibnum,
5849                             vrf_id, port);
5850                         goto out;
5851                 }
5852                 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) {
5853                         /* v_tag mismatch! */
5854                         SCTP_STAT_INCR(sctps_badvtag);
5855                         goto out;
5856                 }
5857         }
5858
5859         if (stcb == NULL) {
5860                 /*
5861                  * no valid TCB for this packet, or we found it's a bad
5862                  * packet while processing control, or we're done with this
5863                  * packet (done or skip rest of data), so we drop it...
5864                  */
5865                 goto out;
5866         }
5867         /*
5868          * DATA chunk processing
5869          */
5870         /* plow through the data chunks while length > offset */
5871
5872         /*
5873          * Rest should be DATA only.  Check authentication state if AUTH for
5874          * DATA is required.
5875          */
5876         if ((length > offset) &&
5877             (stcb != NULL) &&
5878             (stcb->asoc.auth_supported == 1) &&
5879             sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) &&
5880             !stcb->asoc.authenticated) {
5881                 /* "silently" ignore */
5882                 SCTP_STAT_INCR(sctps_recvauthmissing);
5883                 SCTPDBG(SCTP_DEBUG_AUTH1,
5884                     "Data chunk requires AUTH, skipped\n");
5885                 goto trigger_send;
5886         }
5887         if (length > offset) {
5888                 int retval;
5889
5890                 /*
5891                  * First check to make sure our state is correct. We would
5892                  * not get here unless we really did have a tag, so we don't
5893                  * abort if this happens, just dump the chunk silently.
5894                  */
5895                 switch (SCTP_GET_STATE(&stcb->asoc)) {
5896                 case SCTP_STATE_COOKIE_ECHOED:
5897                         /*
5898                          * we consider data with valid tags in this state
5899                          * shows us the cookie-ack was lost. Imply it was
5900                          * there.
5901                          */
5902                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5903                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5904                                     stcb->asoc.overall_error_count,
5905                                     0,
5906                                     SCTP_FROM_SCTP_INPUT,
5907                                     __LINE__);
5908                         }
5909                         stcb->asoc.overall_error_count = 0;
5910                         sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net);
5911                         break;
5912                 case SCTP_STATE_COOKIE_WAIT:
5913                         /*
5914                          * We consider OOTB any data sent during asoc setup.
5915                          */
5916                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5917                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5918                             msg);
5919                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5920                             mflowtype, mflowid, inp->fibnum,
5921                             vrf_id, port);
5922                         goto out;
5923                         /* sa_ignore NOTREACHED */
5924                         break;
5925                 case SCTP_STATE_EMPTY:  /* should not happen */
5926                 case SCTP_STATE_INUSE:  /* should not happen */
5927                 case SCTP_STATE_SHUTDOWN_RECEIVED:      /* This is a peer error */
5928                 case SCTP_STATE_SHUTDOWN_ACK_SENT:
5929                 default:
5930                         goto out;
5931                         /* sa_ignore NOTREACHED */
5932                         break;
5933                 case SCTP_STATE_OPEN:
5934                 case SCTP_STATE_SHUTDOWN_SENT:
5935                         break;
5936                 }
5937                 /* plow through the data chunks while length > offset */
5938                 retval = sctp_process_data(mm, iphlen, &offset, length,
5939                     inp, stcb, net, &high_tsn);
5940                 if (retval == 2) {
5941                         /*
5942                          * The association aborted, NO UNLOCK needed since
5943                          * the association is destroyed.
5944                          */
5945                         stcb = NULL;
5946                         goto out;
5947                 }
5948                 data_processed = 1;
5949                 /*
5950                  * Anything important needs to have been m_copy'ed in
5951                  * process_data
5952                  */
5953         }
5954         /* take care of ecn */
5955         if ((data_processed == 1) &&
5956             (stcb->asoc.ecn_supported == 1) &&
5957             ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) {
5958                 /* Yep, we need to add a ECNE */
5959                 sctp_send_ecn_echo(stcb, net, high_tsn);
5960         }
5961         if ((data_processed == 0) && (fwd_tsn_seen)) {
5962                 int was_a_gap;
5963                 uint32_t highest_tsn;
5964
5965                 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) {
5966                         highest_tsn = stcb->asoc.highest_tsn_inside_nr_map;
5967                 } else {
5968                         highest_tsn = stcb->asoc.highest_tsn_inside_map;
5969                 }
5970                 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn);
5971                 stcb->asoc.send_sack = 1;
5972                 sctp_sack_check(stcb, was_a_gap);
5973         } else if (fwd_tsn_seen) {
5974                 stcb->asoc.send_sack = 1;
5975         }
5976         /* trigger send of any chunks in queue... */
5977 trigger_send:
5978 #ifdef SCTP_AUDITING_ENABLED
5979         sctp_audit_log(0xE0, 2);
5980         sctp_auditing(1, inp, stcb, net);
5981 #endif
5982         SCTPDBG(SCTP_DEBUG_INPUT1,
5983             "Check for chunk output prw:%d tqe:%d tf=%d\n",
5984             stcb->asoc.peers_rwnd,
5985             TAILQ_EMPTY(&stcb->asoc.control_send_queue),
5986             stcb->asoc.total_flight);
5987         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
5988         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
5989                 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq;
5990         }
5991         if (!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue) ||
5992             cnt_ctrl_ready ||
5993             stcb->asoc.trigger_reset ||
5994             ((un_sent) &&
5995             (stcb->asoc.peers_rwnd > 0 ||
5996             (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) {
5997                 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n");
5998                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
5999                 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n");
6000         }
6001 #ifdef SCTP_AUDITING_ENABLED
6002         sctp_audit_log(0xE0, 3);
6003         sctp_auditing(2, inp, stcb, net);
6004 #endif
6005 out:
6006         if (stcb != NULL) {
6007                 SCTP_TCB_UNLOCK(stcb);
6008         }
6009         if (inp_decr != NULL) {
6010                 /* reduce ref-count */
6011                 SCTP_INP_WLOCK(inp_decr);
6012                 SCTP_INP_DECR_REF(inp_decr);
6013                 SCTP_INP_WUNLOCK(inp_decr);
6014         }
6015         return;
6016 }
6017
6018 #ifdef INET
6019 void
6020 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port)
6021 {
6022         struct mbuf *m;
6023         int iphlen;
6024         uint32_t vrf_id = 0;
6025         uint8_t ecn_bits;
6026         struct sockaddr_in src, dst;
6027         struct ip *ip;
6028         struct sctphdr *sh;
6029         struct sctp_chunkhdr *ch;
6030         int length, offset;
6031 #if !defined(SCTP_WITH_NO_CSUM)
6032         uint8_t compute_crc;
6033 #endif
6034         uint32_t mflowid;
6035         uint8_t mflowtype;
6036         uint16_t fibnum;
6037
6038         iphlen = off;
6039         if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) {
6040                 SCTP_RELEASE_PKT(i_pak);
6041                 return;
6042         }
6043         m = SCTP_HEADER_TO_CHAIN(i_pak);
6044 #ifdef SCTP_MBUF_LOGGING
6045         /* Log in any input mbufs */
6046         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6047                 sctp_log_mbc(m, SCTP_MBUF_INPUT);
6048         }
6049 #endif
6050 #ifdef SCTP_PACKET_LOGGING
6051         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
6052                 sctp_packet_log(m);
6053         }
6054 #endif
6055         SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
6056             "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n",
6057             m->m_pkthdr.len,
6058             if_name(m->m_pkthdr.rcvif),
6059             (int)m->m_pkthdr.csum_flags, CSUM_BITS);
6060         mflowid = m->m_pkthdr.flowid;
6061         mflowtype = M_HASHTYPE_GET(m);
6062         fibnum = M_GETFIB(m);
6063         SCTP_STAT_INCR(sctps_recvpackets);
6064         SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
6065         /* Get IP, SCTP, and first chunk header together in the first mbuf. */
6066         offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
6067         if (SCTP_BUF_LEN(m) < offset) {
6068                 if ((m = m_pullup(m, offset)) == NULL) {
6069                         SCTP_STAT_INCR(sctps_hdrops);
6070                         return;
6071                 }
6072         }
6073         ip = mtod(m, struct ip *);
6074         sh = (struct sctphdr *)((caddr_t)ip + iphlen);
6075         ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr));
6076         offset -= sizeof(struct sctp_chunkhdr);
6077         memset(&src, 0, sizeof(struct sockaddr_in));
6078         src.sin_family = AF_INET;
6079         src.sin_len = sizeof(struct sockaddr_in);
6080         src.sin_port = sh->src_port;
6081         src.sin_addr = ip->ip_src;
6082         memset(&dst, 0, sizeof(struct sockaddr_in));
6083         dst.sin_family = AF_INET;
6084         dst.sin_len = sizeof(struct sockaddr_in);
6085         dst.sin_port = sh->dest_port;
6086         dst.sin_addr = ip->ip_dst;
6087         length = ntohs(ip->ip_len);
6088         /* Validate mbuf chain length with IP payload length. */
6089         if (SCTP_HEADER_LEN(m) != length) {
6090                 SCTPDBG(SCTP_DEBUG_INPUT1,
6091                     "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m));
6092                 SCTP_STAT_INCR(sctps_hdrops);
6093                 goto out;
6094         }
6095         /* SCTP does not allow broadcasts or multicasts */
6096         if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) {
6097                 goto out;
6098         }
6099         if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) {
6100                 goto out;
6101         }
6102         ecn_bits = ip->ip_tos;
6103 #if defined(SCTP_WITH_NO_CSUM)
6104         SCTP_STAT_INCR(sctps_recvnocrc);
6105 #else
6106         if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
6107                 SCTP_STAT_INCR(sctps_recvhwcrc);
6108                 compute_crc = 0;
6109         } else {
6110                 SCTP_STAT_INCR(sctps_recvswcrc);
6111                 compute_crc = 1;
6112         }
6113 #endif
6114         sctp_common_input_processing(&m, iphlen, offset, length,
6115             (struct sockaddr *)&src,
6116             (struct sockaddr *)&dst,
6117             sh, ch,
6118 #if !defined(SCTP_WITH_NO_CSUM)
6119             compute_crc,
6120 #endif
6121             ecn_bits,
6122             mflowtype, mflowid, fibnum,
6123             vrf_id, port);
6124 out:
6125         if (m) {
6126                 sctp_m_freem(m);
6127         }
6128         return;
6129 }
6130
6131 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
6132 extern int *sctp_cpuarry;
6133 #endif
6134
6135 int
6136 sctp_input(struct mbuf **mp, int *offp, int proto SCTP_UNUSED)
6137 {
6138         struct mbuf *m;
6139         int off;
6140
6141         m = *mp;
6142         off = *offp;
6143 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
6144         if (mp_ncpus > 1) {
6145                 struct ip *ip;
6146                 struct sctphdr *sh;
6147                 int offset;
6148                 int cpu_to_use;
6149                 uint32_t flowid, tag;
6150
6151                 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) {
6152                         flowid = m->m_pkthdr.flowid;
6153                 } else {
6154                         /*
6155                          * No flow id built by lower layers fix it so we
6156                          * create one.
6157                          */
6158                         offset = off + sizeof(struct sctphdr);
6159                         if (SCTP_BUF_LEN(m) < offset) {
6160                                 if ((m = m_pullup(m, offset)) == NULL) {
6161                                         SCTP_STAT_INCR(sctps_hdrops);
6162                                         return (IPPROTO_DONE);
6163                                 }
6164                         }
6165                         ip = mtod(m, struct ip *);
6166                         sh = (struct sctphdr *)((caddr_t)ip + off);
6167                         tag = htonl(sh->v_tag);
6168                         flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port);
6169                         m->m_pkthdr.flowid = flowid;
6170                         M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE_HASH);
6171                 }
6172                 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus];
6173                 sctp_queue_to_mcore(m, off, cpu_to_use);
6174                 return (IPPROTO_DONE);
6175         }
6176 #endif
6177         sctp_input_with_port(m, off, 0);
6178         return (IPPROTO_DONE);
6179 }
6180 #endif