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, 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         /*
 165          * We are only accepting if we have a socket with positive
 166          * so_qlimit.
 167          */
 168         if ((stcb == NULL) &&
 169             ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
 170             (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) ||
 171             (inp->sctp_socket == NULL) ||
 172             (inp->sctp_socket->so_qlimit == 0))) {
 173                 /*
 174                  * FIX ME ?? What about TCP model and we have a
 175                  * match/restart case? Actually no fix is needed. the lookup
 176                  * will always find the existing assoc so stcb would not be
 177                  * NULL. It may be questionable to do this since we COULD
 178                  * just send back the INIT-ACK and hope that the app did
 179                  * accept()'s by the time the COOKIE was sent. But there is
 180                  * a price to pay for COOKIE generation and I don't want to
 181                  * pay it on the chance that the app will actually do some
 182                  * accepts(). The App just looses and should NOT be in this
 183                  * state :-)
 184                  */
 185                 if (SCTP_BASE_SYSCTL(sctp_blackhole) == 0) {
 186                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 187                             "No listener");
 188                         sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err,
 189                             mflowtype, mflowid,
 190                             vrf_id, port);
 191                 }
 192                 goto outnow;
 193         }
 194         if ((stcb != NULL) &&
 195             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT)) {
 196                 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending SHUTDOWN-ACK\n");
 197                 sctp_send_shutdown_ack(stcb, NULL);
 198                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
 199         } else {
 200                 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n");
 201                 sctp_send_initiate_ack(inp, stcb, m, iphlen, offset, src, dst,
 202                     sh, cp,
 203                     mflowtype, mflowid,
 204                     vrf_id, port,
 205                     ((stcb == NULL) ? SCTP_HOLDS_LOCK : SCTP_NOT_LOCKED));
 206         }
 207 outnow:
 208         if (stcb == NULL) {
 209                 SCTP_INP_RUNLOCK(inp);
 210         }
 211 }
 212
 213 /*
 214  * process peer "INIT/INIT-ACK" chunk returns value < 0 on error
 215  */
 216
 217 int
 218 sctp_is_there_unsent_data(struct sctp_tcb *stcb, int so_locked
 219 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
 220     SCTP_UNUSED
 221 #endif
 222 )
 223 {
 224         int unsent_data = 0;
 225         unsigned int i;
 226         struct sctp_stream_queue_pending *sp;
 227         struct sctp_association *asoc;
 228
 229         /*
 230          * This function returns the number of streams that have true unsent
 231          * data on them. Note that as it looks through it will clean up any
 232          * places that have old data that has been sent but left at top of
 233          * stream queue.
 234          */
 235         asoc = &stcb->asoc;
 236         SCTP_TCB_SEND_LOCK(stcb);
 237         if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
 238                 /* Check to see if some data queued */
 239                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
 240                         /* sa_ignore FREED_MEMORY */
 241                         sp = TAILQ_FIRST(&stcb->asoc.strmout[i].outqueue);
 242                         if (sp == NULL) {
 243                                 continue;
 244                         }
 245                         if ((sp->msg_is_complete) &&
 246                             (sp->length == 0) &&
 247                             (sp->sender_all_done)) {
 248                                 /*
 249                                  * We are doing differed cleanup. Last time
 250                                  * through when we took all the data the
 251                                  * sender_all_done was not set.
 252                                  */
 253                                 if (sp->put_last_out == 0) {
 254                                         SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
 255                                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n",
 256                                             sp->sender_all_done,
 257                                             sp->length,
 258                                             sp->msg_is_complete,
 259                                             sp->put_last_out);
 260                                 }
 261                                 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1);
 262                                 TAILQ_REMOVE(&stcb->asoc.strmout[i].outqueue, sp, next);
 263                                 if (sp->net) {
 264                                         sctp_free_remote_addr(sp->net);
 265                                         sp->net = NULL;
 266                                 }
 267                                 if (sp->data) {
 268                                         sctp_m_freem(sp->data);
 269                                         sp->data = NULL;
 270                                 }
 271                                 sctp_free_a_strmoq(stcb, sp, so_locked);
 272                         } else {
 273                                 unsent_data++;
 274                                 break;
 275                         }
 276                 }
 277         }
 278         SCTP_TCB_SEND_UNLOCK(stcb);
 279         return (unsent_data);
 280 }
 281
 282 static int
 283 sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb)
 284 {
 285         struct sctp_init *init;
 286         struct sctp_association *asoc;
 287         struct sctp_nets *lnet;
 288         unsigned int i;
 289
 290         init = &cp->init;
 291         asoc = &stcb->asoc;
 292         /* save off parameters */
 293         asoc->peer_vtag = ntohl(init->initiate_tag);
 294         asoc->peers_rwnd = ntohl(init->a_rwnd);
 295         /* init tsn's */
 296         asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1;
 297
 298         if (!TAILQ_EMPTY(&asoc->nets)) {
 299                 /* update any ssthresh's that may have a default */
 300                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
 301                         lnet->ssthresh = asoc->peers_rwnd;
 302                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) {
 303                                 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION);
 304                         }
 305                 }
 306         }
 307         SCTP_TCB_SEND_LOCK(stcb);
 308         if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) {
 309                 unsigned int newcnt;
 310                 struct sctp_stream_out *outs;
 311                 struct sctp_stream_queue_pending *sp, *nsp;
 312                 struct sctp_tmit_chunk *chk, *nchk;
 313
 314                 /* abandon the upper streams */
 315                 newcnt = ntohs(init->num_inbound_streams);
 316                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
 317                         if (chk->rec.data.stream_number >= newcnt) {
 318                                 TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next);
 319                                 asoc->send_queue_cnt--;
 320                                 if (asoc->strmout[chk->rec.data.stream_number].chunks_on_queues > 0) {
 321                                         asoc->strmout[chk->rec.data.stream_number].chunks_on_queues--;
 322 #ifdef INVARIANTS
 323                                 } else {
 324                                         panic("No chunks on the queues for sid %u.", chk->rec.data.stream_number);
 325 #endif
 326                                 }
 327                                 if (chk->data != NULL) {
 328                                         sctp_free_bufspace(stcb, asoc, chk, 1);
 329                                         sctp_ulp_notify(SCTP_NOTIFY_UNSENT_DG_FAIL, stcb,
 330                                             0, chk, SCTP_SO_NOT_LOCKED);
 331                                         if (chk->data) {
 332                                                 sctp_m_freem(chk->data);
 333                                                 chk->data = NULL;
 334                                         }
 335                                 }
 336                                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
 337                                 /* sa_ignore FREED_MEMORY */
 338                         }
 339                 }
 340                 if (asoc->strmout) {
 341                         for (i = newcnt; i < asoc->pre_open_streams; i++) {
 342                                 outs = &asoc->strmout[i];
 343                                 TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) {
 344                                         TAILQ_REMOVE(&outs->outqueue, sp, next);
 345                                         asoc->stream_queue_cnt--;
 346                                         sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL,
 347                                             stcb, 0, sp, SCTP_SO_NOT_LOCKED);
 348                                         if (sp->data) {
 349                                                 sctp_m_freem(sp->data);
 350                                                 sp->data = NULL;
 351                                         }
 352                                         if (sp->net) {
 353                                                 sctp_free_remote_addr(sp->net);
 354                                                 sp->net = NULL;
 355                                         }
 356                                         /* Free the chunk */
 357                                         sctp_free_a_strmoq(stcb, sp, SCTP_SO_NOT_LOCKED);
 358                                         /* sa_ignore FREED_MEMORY */
 359                                 }
 360                         }
 361                 }
 362                 /* cut back the count */
 363                 asoc->pre_open_streams = newcnt;
 364         }
 365         SCTP_TCB_SEND_UNLOCK(stcb);
 366         asoc->strm_realoutsize = asoc->streamoutcnt = asoc->pre_open_streams;
 367
 368         /* EY - nr_sack: initialize highest tsn in nr_mapping_array */
 369         asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
 370         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
 371                 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
 372         }
 373         /* This is the next one we expect */
 374         asoc->str_reset_seq_in = asoc->asconf_seq_in + 1;
 375
 376         asoc->mapping_array_base_tsn = ntohl(init->initial_tsn);
 377         asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in;
 378
 379         asoc->advanced_peer_ack_point = asoc->last_acked_seq;
 380         /* open the requested streams */
 381
 382         if (asoc->strmin != NULL) {
 383                 /* Free the old ones */
 384                 struct sctp_queued_to_read *ctl, *nctl;
 385
 386                 for (i = 0; i < asoc->streamincnt; i++) {
 387                         TAILQ_FOREACH_SAFE(ctl, &asoc->strmin[i].inqueue, next, nctl) {
 388                                 TAILQ_REMOVE(&asoc->strmin[i].inqueue, ctl, next);
 389                                 sctp_free_remote_addr(ctl->whoFrom);
 390                                 ctl->whoFrom = NULL;
 391                                 sctp_m_freem(ctl->data);
 392                                 ctl->data = NULL;
 393                                 sctp_free_a_readq(stcb, ctl);
 394                         }
 395                 }
 396                 SCTP_FREE(asoc->strmin, SCTP_M_STRMI);
 397         }
 398         if (asoc->max_inbound_streams > ntohs(init->num_outbound_streams)) {
 399                 asoc->streamincnt = ntohs(init->num_outbound_streams);
 400         } else {
 401                 asoc->streamincnt = asoc->max_inbound_streams;
 402         }
 403         SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt *
 404             sizeof(struct sctp_stream_in), SCTP_M_STRMI);
 405         if (asoc->strmin == NULL) {
 406                 /* we didn't get memory for the streams! */
 407                 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n");
 408                 return (-1);
 409         }
 410         for (i = 0; i < asoc->streamincnt; i++) {
 411                 asoc->strmin[i].stream_no = i;
 412                 asoc->strmin[i].last_sequence_delivered = 0xffff;
 413                 TAILQ_INIT(&asoc->strmin[i].inqueue);
 414                 asoc->strmin[i].delivery_started = 0;
 415         }
 416         /*
 417          * load_address_from_init will put the addresses into the
 418          * association when the COOKIE is processed or the INIT-ACK is
 419          * processed. Both types of COOKIE's existing and new call this
 420          * routine. It will remove addresses that are no longer in the
 421          * association (for the restarting case where addresses are
 422          * removed). Up front when the INIT arrives we will discard it if it
 423          * is a restart and new addresses have been added.
 424          */
 425         /* sa_ignore MEMLEAK */
 426         return (0);
 427 }
 428
 429 /*
 430  * INIT-ACK message processing/consumption returns value < 0 on error
 431  */
 432 static int
 433 sctp_process_init_ack(struct mbuf *m, int iphlen, int offset,
 434     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
 435     struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
 436     struct sctp_nets *net, int *abort_no_unlock,
 437     uint8_t mflowtype, uint32_t mflowid,
 438     uint32_t vrf_id)
 439 {
 440         struct sctp_association *asoc;
 441         struct mbuf *op_err;
 442         int retval, abort_flag;
 443         uint32_t initack_limit;
 444         int nat_friendly = 0;
 445
 446         /* First verify that we have no illegal param's */
 447         abort_flag = 0;
 448
 449         op_err = sctp_arethere_unrecognized_parameters(m,
 450             (offset + sizeof(struct sctp_init_chunk)),
 451             &abort_flag, (struct sctp_chunkhdr *)cp, &nat_friendly);
 452         if (abort_flag) {
 453                 /* Send an abort and notify peer */
 454                 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
 455                 *abort_no_unlock = 1;
 456                 return (-1);
 457         }
 458         asoc = &stcb->asoc;
 459         asoc->peer_supports_nat = (uint8_t) nat_friendly;
 460         /* process the peer's parameters in the INIT-ACK */
 461         retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb);
 462         if (retval < 0) {
 463                 return (retval);
 464         }
 465         initack_limit = offset + ntohs(cp->ch.chunk_length);
 466         /* load all addresses */
 467         if ((retval = sctp_load_addresses_from_init(stcb, m,
 468             (offset + sizeof(struct sctp_init_chunk)), initack_limit,
 469             src, dst, NULL))) {
 470                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 471                     "Problem with address parameters");
 472                 SCTPDBG(SCTP_DEBUG_INPUT1,
 473                     "Load addresses from INIT causes an abort %d\n",
 474                     retval);
 475                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
 476                     src, dst, sh, op_err,
 477                     mflowtype, mflowid,
 478                     vrf_id, net->port);
 479                 *abort_no_unlock = 1;
 480                 return (-1);
 481         }
 482         /* if the peer doesn't support asconf, flush the asconf queue */
 483         if (asoc->asconf_supported == 0) {
 484                 struct sctp_asconf_addr *param, *nparam;
 485
 486                 TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) {
 487                         TAILQ_REMOVE(&asoc->asconf_queue, param, next);
 488                         SCTP_FREE(param, SCTP_M_ASC_ADDR);
 489                 }
 490         }
 491         stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs,
 492             stcb->asoc.local_hmacs);
 493         if (op_err) {
 494                 sctp_queue_op_err(stcb, op_err);
 495                 /* queuing will steal away the mbuf chain to the out queue */
 496                 op_err = NULL;
 497         }
 498         /* extract the cookie and queue it to "echo" it back... */
 499         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 500                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
 501                     stcb->asoc.overall_error_count,
 502                     0,
 503                     SCTP_FROM_SCTP_INPUT,
 504                     __LINE__);
 505         }
 506         stcb->asoc.overall_error_count = 0;
 507         net->error_count = 0;
 508
 509         /*
 510          * Cancel the INIT timer, We do this first before queueing the
 511          * cookie. We always cancel at the primary to assue that we are
 512          * canceling the timer started by the INIT which always goes to the
 513          * primary.
 514          */
 515         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb,
 516             asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3);
 517
 518         /* calculate the RTO */
 519         net->RTO = sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, sctp_align_safe_nocopy,
 520             SCTP_RTT_FROM_NON_DATA);
 521
 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                         /* We abort with an error of missing mandatory param */
 531                         op_err = sctp_generate_cause(SCTP_CAUSE_MISSING_PARAM, "");
 532                         if (op_err) {
 533                                 /*
 534                                  * Expand beyond to include the mandatory
 535                                  * param cookie
 536                                  */
 537                                 struct sctp_inv_mandatory_param *mp;
 538
 539                                 SCTP_BUF_LEN(op_err) =
 540                                     sizeof(struct sctp_inv_mandatory_param);
 541                                 mp = mtod(op_err,
 542                                     struct sctp_inv_mandatory_param *);
 543                                 /* Subtract the reserved param */
 544                                 mp->length =
 545                                     htons(sizeof(struct sctp_inv_mandatory_param) - 2);
 546                                 mp->num_param = htonl(1);
 547                                 mp->param = htons(SCTP_STATE_COOKIE);
 548                                 mp->resv = 0;
 549                         }
 550                         sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
 551                             src, dst, sh, op_err,
 552                             mflowtype, mflowid,
 553                             vrf_id, net->port);
 554                         *abort_no_unlock = 1;
 555                 }
 556                 return (retval);
 557         }
 558         return (0);
 559 }
 560
 561 static void
 562 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp,
 563     struct sctp_tcb *stcb, struct sctp_nets *net)
 564 {
 565         union sctp_sockstore store;
 566         struct sctp_nets *r_net, *f_net;
 567         struct timeval tv;
 568         int req_prim = 0;
 569         uint16_t old_error_counter;
 570
 571         if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) {
 572                 /* Invalid length */
 573                 return;
 574         }
 575         memset(&store, 0, sizeof(store));
 576         switch (cp->heartbeat.hb_info.addr_family) {
 577 #ifdef INET
 578         case AF_INET:
 579                 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) {
 580                         store.sin.sin_family = cp->heartbeat.hb_info.addr_family;
 581                         store.sin.sin_len = cp->heartbeat.hb_info.addr_len;
 582                         store.sin.sin_port = stcb->rport;
 583                         memcpy(&store.sin.sin_addr, cp->heartbeat.hb_info.address,
 584                             sizeof(store.sin.sin_addr));
 585                 } else {
 586                         return;
 587                 }
 588                 break;
 589 #endif
 590 #ifdef INET6
 591         case AF_INET6:
 592                 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) {
 593                         store.sin6.sin6_family = cp->heartbeat.hb_info.addr_family;
 594                         store.sin6.sin6_len = cp->heartbeat.hb_info.addr_len;
 595                         store.sin6.sin6_port = stcb->rport;
 596                         memcpy(&store.sin6.sin6_addr, cp->heartbeat.hb_info.address, sizeof(struct in6_addr));
 597                 } else {
 598                         return;
 599                 }
 600                 break;
 601 #endif
 602         default:
 603                 return;
 604         }
 605         r_net = sctp_findnet(stcb, &store.sa);
 606         if (r_net == NULL) {
 607                 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n");
 608                 return;
 609         }
 610         if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) &&
 611             (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) &&
 612             (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) {
 613                 /*
 614                  * If the its a HB and it's random value is correct when can
 615                  * confirm the destination.
 616                  */
 617                 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
 618                 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) {
 619                         stcb->asoc.primary_destination = r_net;
 620                         r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY;
 621                         f_net = TAILQ_FIRST(&stcb->asoc.nets);
 622                         if (f_net != r_net) {
 623                                 /*
 624                                  * first one on the list is NOT the primary
 625                                  * sctp_cmpaddr() is much more efficent if
 626                                  * the primary is the first on the list,
 627                                  * make it so.
 628                                  */
 629                                 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next);
 630                                 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next);
 631                         }
 632                         req_prim = 1;
 633                 }
 634                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
 635                     stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED);
 636                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb,
 637                     r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4);
 638                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
 639         }
 640         old_error_counter = r_net->error_count;
 641         r_net->error_count = 0;
 642         r_net->hb_responded = 1;
 643         tv.tv_sec = cp->heartbeat.hb_info.time_value_1;
 644         tv.tv_usec = cp->heartbeat.hb_info.time_value_2;
 645         /* Now lets do a RTO with this */
 646         r_net->RTO = sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, sctp_align_safe_nocopy,
 647             SCTP_RTT_FROM_NON_DATA);
 648         if (!(r_net->dest_state & SCTP_ADDR_REACHABLE)) {
 649                 r_net->dest_state |= SCTP_ADDR_REACHABLE;
 650                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb,
 651                     0, (void *)r_net, SCTP_SO_NOT_LOCKED);
 652         }
 653         if (r_net->dest_state & SCTP_ADDR_PF) {
 654                 r_net->dest_state &= ~SCTP_ADDR_PF;
 655                 stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net);
 656         }
 657         if (old_error_counter > 0) {
 658                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
 659                     stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_5);
 660                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
 661         }
 662         if (r_net == stcb->asoc.primary_destination) {
 663                 if (stcb->asoc.alternate) {
 664                         /* release the alternate, primary is good */
 665                         sctp_free_remote_addr(stcb->asoc.alternate);
 666                         stcb->asoc.alternate = NULL;
 667                 }
 668         }
 669         /* Mobility adaptation */
 670         if (req_prim) {
 671                 if ((sctp_is_mobility_feature_on(stcb->sctp_ep,
 672                     SCTP_MOBILITY_BASE) ||
 673                     sctp_is_mobility_feature_on(stcb->sctp_ep,
 674                     SCTP_MOBILITY_FASTHANDOFF)) &&
 675                     sctp_is_mobility_feature_on(stcb->sctp_ep,
 676                     SCTP_MOBILITY_PRIM_DELETED)) {
 677
 678                         sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED,
 679                             stcb->sctp_ep, stcb, NULL,
 680                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_6);
 681                         if (sctp_is_mobility_feature_on(stcb->sctp_ep,
 682                             SCTP_MOBILITY_FASTHANDOFF)) {
 683                                 sctp_assoc_immediate_retrans(stcb,
 684                                     stcb->asoc.primary_destination);
 685                         }
 686                         if (sctp_is_mobility_feature_on(stcb->sctp_ep,
 687                             SCTP_MOBILITY_BASE)) {
 688                                 sctp_move_chunks_from_net(stcb,
 689                                     stcb->asoc.deleted_primary);
 690                         }
 691                         sctp_delete_prim_timer(stcb->sctp_ep, stcb,
 692                             stcb->asoc.deleted_primary);
 693                 }
 694         }
 695 }
 696
 697 static int
 698 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb)
 699 {
 700         /*
 701          * return 0 means we want you to proceed with the abort non-zero
 702          * means no abort processing
 703          */
 704         struct sctpasochead *head;
 705
 706         if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_WAIT) {
 707                 /* generate a new vtag and send init */
 708                 LIST_REMOVE(stcb, sctp_asocs);
 709                 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1);
 710                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
 711                 /*
 712                  * put it in the bucket in the vtag hash of assoc's for the
 713                  * system
 714                  */
 715                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
 716                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
 717                 return (1);
 718         }
 719         if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) {
 720                 /*
 721                  * treat like a case where the cookie expired i.e.: - dump
 722                  * current cookie. - generate a new vtag. - resend init.
 723                  */
 724                 /* generate a new vtag and send init */
 725                 LIST_REMOVE(stcb, sctp_asocs);
 726                 stcb->asoc.state &= ~SCTP_STATE_COOKIE_ECHOED;
 727                 stcb->asoc.state |= SCTP_STATE_COOKIE_WAIT;
 728                 sctp_stop_all_cookie_timers(stcb);
 729                 sctp_toss_old_cookies(stcb, &stcb->asoc);
 730                 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1);
 731                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
 732                 /*
 733                  * put it in the bucket in the vtag hash of assoc's for the
 734                  * system
 735                  */
 736                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
 737                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
 738                 return (1);
 739         }
 740         return (0);
 741 }
 742
 743 static int
 744 sctp_handle_nat_missing_state(struct sctp_tcb *stcb,
 745     struct sctp_nets *net)
 746 {
 747         /*
 748          * return 0 means we want you to proceed with the abort non-zero
 749          * means no abort processing
 750          */
 751         if (stcb->asoc.auth_supported == 0) {
 752                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n");
 753                 return (0);
 754         }
 755         sctp_asconf_send_nat_state_update(stcb, net);
 756         return (1);
 757 }
 758
 759
 760 static void
 761 sctp_handle_abort(struct sctp_abort_chunk *abort,
 762     struct sctp_tcb *stcb, struct sctp_nets *net)
 763 {
 764 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 765         struct socket *so;
 766
 767 #endif
 768         uint16_t len;
 769         uint16_t error;
 770
 771         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n");
 772         if (stcb == NULL)
 773                 return;
 774
 775         len = ntohs(abort->ch.chunk_length);
 776         if (len > sizeof(struct sctp_chunkhdr)) {
 777                 /*
 778                  * Need to check the cause codes for our two magic nat
 779                  * aborts which don't kill the assoc necessarily.
 780                  */
 781                 struct sctp_missing_nat_state *natc;
 782
 783                 natc = (struct sctp_missing_nat_state *)(abort + 1);
 784                 error = ntohs(natc->cause);
 785                 if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) {
 786                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n",
 787                             abort->ch.chunk_flags);
 788                         if (sctp_handle_nat_colliding_state(stcb)) {
 789                                 return;
 790                         }
 791                 } else if (error == SCTP_CAUSE_NAT_MISSING_STATE) {
 792                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n",
 793                             abort->ch.chunk_flags);
 794                         if (sctp_handle_nat_missing_state(stcb, net)) {
 795                                 return;
 796                         }
 797                 }
 798         } else {
 799                 error = 0;
 800         }
 801         /* stop any receive timers */
 802         sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net,
 803             SCTP_FROM_SCTP_INPUT + SCTP_LOC_7);
 804         /* notify user of the abort and clean up... */
 805         sctp_abort_notification(stcb, 1, error, abort, SCTP_SO_NOT_LOCKED);
 806         /* free the tcb */
 807         SCTP_STAT_INCR_COUNTER32(sctps_aborted);
 808         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) ||
 809             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
 810                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 811         }
 812 #ifdef SCTP_ASOCLOG_OF_TSNS
 813         sctp_print_out_track_log(stcb);
 814 #endif
 815 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 816         so = SCTP_INP_SO(stcb->sctp_ep);
 817         atomic_add_int(&stcb->asoc.refcnt, 1);
 818         SCTP_TCB_UNLOCK(stcb);
 819         SCTP_SOCKET_LOCK(so, 1);
 820         SCTP_TCB_LOCK(stcb);
 821         atomic_subtract_int(&stcb->asoc.refcnt, 1);
 822 #endif
 823         stcb->asoc.state |= SCTP_STATE_WAS_ABORTED;
 824         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
 825             SCTP_FROM_SCTP_INPUT + SCTP_LOC_8);
 826 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 827         SCTP_SOCKET_UNLOCK(so, 1);
 828 #endif
 829         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n");
 830 }
 831
 832 static void
 833 sctp_start_net_timers(struct sctp_tcb *stcb)
 834 {
 835         uint32_t cnt_hb_sent;
 836         struct sctp_nets *net;
 837
 838         cnt_hb_sent = 0;
 839         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
 840                 /*
 841                  * For each network start: 1) A pmtu timer. 2) A HB timer 3)
 842                  * If the dest in unconfirmed send a hb as well if under
 843                  * max_hb_burst have been sent.
 844                  */
 845                 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net);
 846                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net);
 847                 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) &&
 848                     (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) {
 849                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
 850                         cnt_hb_sent++;
 851                 }
 852         }
 853         if (cnt_hb_sent) {
 854                 sctp_chunk_output(stcb->sctp_ep, stcb,
 855                     SCTP_OUTPUT_FROM_COOKIE_ACK,
 856                     SCTP_SO_NOT_LOCKED);
 857         }
 858 }
 859
 860
 861 static void
 862 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp,
 863     struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag)
 864 {
 865         struct sctp_association *asoc;
 866         int some_on_streamwheel;
 867
 868 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 869         struct socket *so;
 870
 871 #endif
 872
 873         SCTPDBG(SCTP_DEBUG_INPUT2,
 874             "sctp_handle_shutdown: handling SHUTDOWN\n");
 875         if (stcb == NULL)
 876                 return;
 877         asoc = &stcb->asoc;
 878         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
 879             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
 880                 return;
 881         }
 882         if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) {
 883                 /* Shutdown NOT the expected size */
 884                 return;
 885         } else {
 886                 sctp_update_acked(stcb, cp, abort_flag);
 887                 if (*abort_flag) {
 888                         return;
 889                 }
 890         }
 891         if (asoc->control_pdapi) {
 892                 /*
 893                  * With a normal shutdown we assume the end of last record.
 894                  */
 895                 SCTP_INP_READ_LOCK(stcb->sctp_ep);
 896                 asoc->control_pdapi->end_added = 1;
 897                 asoc->control_pdapi->pdapi_aborted = 1;
 898                 asoc->control_pdapi = NULL;
 899                 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
 900 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 901                 so = SCTP_INP_SO(stcb->sctp_ep);
 902                 atomic_add_int(&stcb->asoc.refcnt, 1);
 903                 SCTP_TCB_UNLOCK(stcb);
 904                 SCTP_SOCKET_LOCK(so, 1);
 905                 SCTP_TCB_LOCK(stcb);
 906                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 907                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
 908                         /* assoc was freed while we were unlocked */
 909                         SCTP_SOCKET_UNLOCK(so, 1);
 910                         return;
 911                 }
 912 #endif
 913                 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
 914 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 915                 SCTP_SOCKET_UNLOCK(so, 1);
 916 #endif
 917         }
 918         /* goto SHUTDOWN_RECEIVED state to block new requests */
 919         if (stcb->sctp_socket) {
 920                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
 921                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) &&
 922                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) {
 923                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_RECEIVED);
 924                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
 925                         /*
 926                          * notify upper layer that peer has initiated a
 927                          * shutdown
 928                          */
 929                         sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
 930
 931                         /* reset time */
 932                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
 933                 }
 934         }
 935         if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) {
 936                 /*
 937                  * stop the shutdown timer, since we WILL move to
 938                  * SHUTDOWN-ACK-SENT.
 939                  */
 940                 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
 941                     net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9);
 942         }
 943         /* Now is there unsent data on a stream somewhere? */
 944         some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED);
 945
 946         if (!TAILQ_EMPTY(&asoc->send_queue) ||
 947             !TAILQ_EMPTY(&asoc->sent_queue) ||
 948             some_on_streamwheel) {
 949                 /* By returning we will push more data out */
 950                 return;
 951         } else {
 952                 /* no outstanding data to send, so move on... */
 953                 /* send SHUTDOWN-ACK */
 954                 /* move to SHUTDOWN-ACK-SENT state */
 955                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
 956                     (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
 957                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 958                 }
 959                 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT);
 960                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
 961                 sctp_stop_timers_for_shutdown(stcb);
 962                 sctp_send_shutdown_ack(stcb, net);
 963                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep,
 964                     stcb, net);
 965         }
 966 }
 967
 968 static void
 969 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED,
 970     struct sctp_tcb *stcb,
 971     struct sctp_nets *net)
 972 {
 973         struct sctp_association *asoc;
 974
 975 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 976         struct socket *so;
 977
 978         so = SCTP_INP_SO(stcb->sctp_ep);
 979 #endif
 980         SCTPDBG(SCTP_DEBUG_INPUT2,
 981             "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n");
 982         if (stcb == NULL)
 983                 return;
 984
 985         asoc = &stcb->asoc;
 986         /* process according to association state */
 987         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
 988             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
 989                 /* unexpected SHUTDOWN-ACK... do OOTB handling... */
 990                 sctp_send_shutdown_complete(stcb, net, 1);
 991                 SCTP_TCB_UNLOCK(stcb);
 992                 return;
 993         }
 994         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
 995             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
 996                 /* unexpected SHUTDOWN-ACK... so ignore... */
 997                 SCTP_TCB_UNLOCK(stcb);
 998                 return;
 999         }
1000         if (asoc->control_pdapi) {
1001                 /*
1002                  * With a normal shutdown we assume the end of last record.
1003                  */
1004                 SCTP_INP_READ_LOCK(stcb->sctp_ep);
1005                 asoc->control_pdapi->end_added = 1;
1006                 asoc->control_pdapi->pdapi_aborted = 1;
1007                 asoc->control_pdapi = NULL;
1008                 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
1009 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1010                 atomic_add_int(&stcb->asoc.refcnt, 1);
1011                 SCTP_TCB_UNLOCK(stcb);
1012                 SCTP_SOCKET_LOCK(so, 1);
1013                 SCTP_TCB_LOCK(stcb);
1014                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
1015                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1016                         /* assoc was freed while we were unlocked */
1017                         SCTP_SOCKET_UNLOCK(so, 1);
1018                         return;
1019                 }
1020 #endif
1021                 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
1022 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1023                 SCTP_SOCKET_UNLOCK(so, 1);
1024 #endif
1025         }
1026 #ifdef INVARIANTS
1027         if (!TAILQ_EMPTY(&asoc->send_queue) ||
1028             !TAILQ_EMPTY(&asoc->sent_queue) ||
1029             !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
1030                 panic("Queues are not empty when handling SHUTDOWN-ACK");
1031         }
1032 #endif
1033         /* stop the timer */
1034         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net,
1035             SCTP_FROM_SCTP_INPUT + SCTP_LOC_10);
1036         /* send SHUTDOWN-COMPLETE */
1037         sctp_send_shutdown_complete(stcb, net, 0);
1038         /* notify upper layer protocol */
1039         if (stcb->sctp_socket) {
1040                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1041                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
1042                         stcb->sctp_socket->so_snd.sb_cc = 0;
1043                 }
1044                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
1045         }
1046         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
1047         /* free the TCB but first save off the ep */
1048 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1049         atomic_add_int(&stcb->asoc.refcnt, 1);
1050         SCTP_TCB_UNLOCK(stcb);
1051         SCTP_SOCKET_LOCK(so, 1);
1052         SCTP_TCB_LOCK(stcb);
1053         atomic_subtract_int(&stcb->asoc.refcnt, 1);
1054 #endif
1055         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1056             SCTP_FROM_SCTP_INPUT + SCTP_LOC_11);
1057 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1058         SCTP_SOCKET_UNLOCK(so, 1);
1059 #endif
1060 }
1061
1062 /*
1063  * Skip past the param header and then we will find the chunk that caused the
1064  * problem. There are two possiblities ASCONF or FWD-TSN other than that and
1065  * our peer must be broken.
1066  */
1067 static void
1068 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr,
1069     struct sctp_nets *net)
1070 {
1071         struct sctp_chunkhdr *chk;
1072
1073         chk = (struct sctp_chunkhdr *)((caddr_t)phdr + sizeof(*phdr));
1074         switch (chk->chunk_type) {
1075         case SCTP_ASCONF_ACK:
1076         case SCTP_ASCONF:
1077                 sctp_asconf_cleanup(stcb, net);
1078                 break;
1079         case SCTP_FORWARD_CUM_TSN:
1080                 stcb->asoc.prsctp_supported = 0;
1081                 break;
1082         default:
1083                 SCTPDBG(SCTP_DEBUG_INPUT2,
1084                     "Peer does not support chunk type %d(%x)??\n",
1085                     chk->chunk_type, (uint32_t) chk->chunk_type);
1086                 break;
1087         }
1088 }
1089
1090 /*
1091  * Skip past the param header and then we will find the param that caused the
1092  * problem.  There are a number of param's in a ASCONF OR the prsctp param
1093  * these will turn of specific features.
1094  * XXX: Is this the right thing to do?
1095  */
1096 static void
1097 sctp_process_unrecog_param(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr)
1098 {
1099         struct sctp_paramhdr *pbad;
1100
1101         pbad = phdr + 1;
1102         switch (ntohs(pbad->param_type)) {
1103                 /* pr-sctp draft */
1104         case SCTP_PRSCTP_SUPPORTED:
1105                 stcb->asoc.prsctp_supported = 0;
1106                 break;
1107         case SCTP_SUPPORTED_CHUNK_EXT:
1108                 break;
1109                 /* draft-ietf-tsvwg-addip-sctp */
1110         case SCTP_HAS_NAT_SUPPORT:
1111                 stcb->asoc.peer_supports_nat = 0;
1112                 break;
1113         case SCTP_ADD_IP_ADDRESS:
1114         case SCTP_DEL_IP_ADDRESS:
1115         case SCTP_SET_PRIM_ADDR:
1116                 stcb->asoc.asconf_supported = 0;
1117                 break;
1118         case SCTP_SUCCESS_REPORT:
1119         case SCTP_ERROR_CAUSE_IND:
1120                 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n");
1121                 SCTPDBG(SCTP_DEBUG_INPUT2,
1122                     "Turning off ASCONF to this strange peer\n");
1123                 stcb->asoc.asconf_supported = 0;
1124                 break;
1125         default:
1126                 SCTPDBG(SCTP_DEBUG_INPUT2,
1127                     "Peer does not support param type %d(%x)??\n",
1128                     pbad->param_type, (uint32_t) pbad->param_type);
1129                 break;
1130         }
1131 }
1132
1133 static int
1134 sctp_handle_error(struct sctp_chunkhdr *ch,
1135     struct sctp_tcb *stcb, struct sctp_nets *net)
1136 {
1137         int chklen;
1138         struct sctp_paramhdr *phdr;
1139         uint16_t error, error_type;
1140         uint16_t error_len;
1141         struct sctp_association *asoc;
1142         int adjust;
1143
1144 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1145         struct socket *so;
1146
1147 #endif
1148
1149         /* parse through all of the errors and process */
1150         asoc = &stcb->asoc;
1151         phdr = (struct sctp_paramhdr *)((caddr_t)ch +
1152             sizeof(struct sctp_chunkhdr));
1153         chklen = ntohs(ch->chunk_length) - sizeof(struct sctp_chunkhdr);
1154         error = 0;
1155         while ((size_t)chklen >= sizeof(struct sctp_paramhdr)) {
1156                 /* Process an Error Cause */
1157                 error_type = ntohs(phdr->param_type);
1158                 error_len = ntohs(phdr->param_length);
1159                 if ((error_len > chklen) || (error_len == 0)) {
1160                         /* invalid param length for this param */
1161                         SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in error param- chunk left:%d errorlen:%d\n",
1162                             chklen, error_len);
1163                         return (0);
1164                 }
1165                 if (error == 0) {
1166                         /* report the first error cause */
1167                         error = error_type;
1168                 }
1169                 switch (error_type) {
1170                 case SCTP_CAUSE_INVALID_STREAM:
1171                 case SCTP_CAUSE_MISSING_PARAM:
1172                 case SCTP_CAUSE_INVALID_PARAM:
1173                 case SCTP_CAUSE_NO_USER_DATA:
1174                         SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %d back? We have a bug :/ (or do they?)\n",
1175                             error_type);
1176                         break;
1177                 case SCTP_CAUSE_NAT_COLLIDING_STATE:
1178                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n",
1179                             ch->chunk_flags);
1180                         if (sctp_handle_nat_colliding_state(stcb)) {
1181                                 return (0);
1182                         }
1183                         break;
1184                 case SCTP_CAUSE_NAT_MISSING_STATE:
1185                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n",
1186                             ch->chunk_flags);
1187                         if (sctp_handle_nat_missing_state(stcb, net)) {
1188                                 return (0);
1189                         }
1190                         break;
1191                 case SCTP_CAUSE_STALE_COOKIE:
1192                         /*
1193                          * We only act if we have echoed a cookie and are
1194                          * waiting.
1195                          */
1196                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) {
1197                                 int *p;
1198
1199                                 p = (int *)((caddr_t)phdr + sizeof(*phdr));
1200                                 /* Save the time doubled */
1201                                 asoc->cookie_preserve_req = ntohl(*p) << 1;
1202                                 asoc->stale_cookie_count++;
1203                                 if (asoc->stale_cookie_count >
1204                                     asoc->max_init_times) {
1205                                         sctp_abort_notification(stcb, 0, 0, NULL, SCTP_SO_NOT_LOCKED);
1206                                         /* now free the asoc */
1207 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1208                                         so = SCTP_INP_SO(stcb->sctp_ep);
1209                                         atomic_add_int(&stcb->asoc.refcnt, 1);
1210                                         SCTP_TCB_UNLOCK(stcb);
1211                                         SCTP_SOCKET_LOCK(so, 1);
1212                                         SCTP_TCB_LOCK(stcb);
1213                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
1214 #endif
1215                                         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1216                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_12);
1217 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1218                                         SCTP_SOCKET_UNLOCK(so, 1);
1219 #endif
1220                                         return (-1);
1221                                 }
1222                                 /* blast back to INIT state */
1223                                 sctp_toss_old_cookies(stcb, &stcb->asoc);
1224                                 asoc->state &= ~SCTP_STATE_COOKIE_ECHOED;
1225                                 asoc->state |= SCTP_STATE_COOKIE_WAIT;
1226                                 sctp_stop_all_cookie_timers(stcb);
1227                                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
1228                         }
1229                         break;
1230                 case SCTP_CAUSE_UNRESOLVABLE_ADDR:
1231                         /*
1232                          * Nothing we can do here, we don't do hostname
1233                          * addresses so if the peer does not like my IPv6
1234                          * (or IPv4 for that matter) it does not matter. If
1235                          * they don't support that type of address, they can
1236                          * NOT possibly get that packet type... i.e. with no
1237                          * IPv6 you can't recieve a IPv6 packet. so we can
1238                          * safely ignore this one. If we ever added support
1239                          * for HOSTNAME Addresses, then we would need to do
1240                          * something here.
1241                          */
1242                         break;
1243                 case SCTP_CAUSE_UNRECOG_CHUNK:
1244                         sctp_process_unrecog_chunk(stcb, phdr, net);
1245                         break;
1246                 case SCTP_CAUSE_UNRECOG_PARAM:
1247                         sctp_process_unrecog_param(stcb, phdr);
1248                         break;
1249                 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN:
1250                         /*
1251                          * We ignore this since the timer will drive out a
1252                          * new cookie anyway and there timer will drive us
1253                          * to send a SHUTDOWN_COMPLETE. We can't send one
1254                          * here since we don't have their tag.
1255                          */
1256                         break;
1257                 case SCTP_CAUSE_DELETING_LAST_ADDR:
1258                 case SCTP_CAUSE_RESOURCE_SHORTAGE:
1259                 case SCTP_CAUSE_DELETING_SRC_ADDR:
1260                         /*
1261                          * We should NOT get these here, but in a
1262                          * ASCONF-ACK.
1263                          */
1264                         SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a Operational Error?<%d>?\n",
1265                             error_type);
1266                         break;
1267                 case SCTP_CAUSE_OUT_OF_RESC:
1268                         /*
1269                          * And what, pray tell do we do with the fact that
1270                          * the peer is out of resources? Not really sure we
1271                          * could do anything but abort. I suspect this
1272                          * should have came WITH an abort instead of in a
1273                          * OP-ERROR.
1274                          */
1275                         break;
1276                 default:
1277                         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown error type = 0x%xh\n",
1278                             error_type);
1279                         break;
1280                 }
1281                 adjust = SCTP_SIZE32(error_len);
1282                 chklen -= adjust;
1283                 phdr = (struct sctp_paramhdr *)((caddr_t)phdr + adjust);
1284         }
1285         sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, error, ch, SCTP_SO_NOT_LOCKED);
1286         return (0);
1287 }
1288
1289 static int
1290 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset,
1291     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
1292     struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
1293     struct sctp_nets *net, int *abort_no_unlock,
1294     uint8_t mflowtype, uint32_t mflowid,
1295     uint32_t vrf_id)
1296 {
1297         struct sctp_init_ack *init_ack;
1298         struct mbuf *op_err;
1299
1300         SCTPDBG(SCTP_DEBUG_INPUT2,
1301             "sctp_handle_init_ack: handling INIT-ACK\n");
1302
1303         if (stcb == NULL) {
1304                 SCTPDBG(SCTP_DEBUG_INPUT2,
1305                     "sctp_handle_init_ack: TCB is null\n");
1306                 return (-1);
1307         }
1308         if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) {
1309                 /* Invalid length */
1310                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1311                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1312                     src, dst, sh, op_err,
1313                     mflowtype, mflowid,
1314                     vrf_id, net->port);
1315                 *abort_no_unlock = 1;
1316                 return (-1);
1317         }
1318         init_ack = &cp->init;
1319         /* validate parameters */
1320         if (init_ack->initiate_tag == 0) {
1321                 /* protocol error... send an abort */
1322                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1323                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1324                     src, dst, sh, op_err,
1325                     mflowtype, mflowid,
1326                     vrf_id, net->port);
1327                 *abort_no_unlock = 1;
1328                 return (-1);
1329         }
1330         if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) {
1331                 /* protocol error... send an abort */
1332                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1333                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1334                     src, dst, sh, op_err,
1335                     mflowtype, mflowid,
1336                     vrf_id, net->port);
1337                 *abort_no_unlock = 1;
1338                 return (-1);
1339         }
1340         if (init_ack->num_inbound_streams == 0) {
1341                 /* protocol error... send an abort */
1342                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1343                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1344                     src, dst, sh, op_err,
1345                     mflowtype, mflowid,
1346                     vrf_id, net->port);
1347                 *abort_no_unlock = 1;
1348                 return (-1);
1349         }
1350         if (init_ack->num_outbound_streams == 0) {
1351                 /* protocol error... send an abort */
1352                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1353                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1354                     src, dst, sh, op_err,
1355                     mflowtype, mflowid,
1356                     vrf_id, net->port);
1357                 *abort_no_unlock = 1;
1358                 return (-1);
1359         }
1360         /* process according to association state... */
1361         switch (stcb->asoc.state & SCTP_STATE_MASK) {
1362         case SCTP_STATE_COOKIE_WAIT:
1363                 /* this is the expected state for this chunk */
1364                 /* process the INIT-ACK parameters */
1365                 if (stcb->asoc.primary_destination->dest_state &
1366                     SCTP_ADDR_UNCONFIRMED) {
1367                         /*
1368                          * The primary is where we sent the INIT, we can
1369                          * always consider it confirmed when the INIT-ACK is
1370                          * returned. Do this before we load addresses
1371                          * though.
1372                          */
1373                         stcb->asoc.primary_destination->dest_state &=
1374                             ~SCTP_ADDR_UNCONFIRMED;
1375                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
1376                             stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED);
1377                 }
1378                 if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb,
1379                     net, abort_no_unlock,
1380                     mflowtype, mflowid,
1381                     vrf_id) < 0) {
1382                         /* error in parsing parameters */
1383                         return (-1);
1384                 }
1385                 /* update our state */
1386                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n");
1387                 SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_ECHOED);
1388
1389                 /* reset the RTO calc */
1390                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
1391                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
1392                             stcb->asoc.overall_error_count,
1393                             0,
1394                             SCTP_FROM_SCTP_INPUT,
1395                             __LINE__);
1396                 }
1397                 stcb->asoc.overall_error_count = 0;
1398                 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
1399                 /*
1400                  * collapse the init timer back in case of a exponential
1401                  * backoff
1402                  */
1403                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep,
1404                     stcb, net);
1405                 /*
1406                  * the send at the end of the inbound data processing will
1407                  * cause the cookie to be sent
1408                  */
1409                 break;
1410         case SCTP_STATE_SHUTDOWN_SENT:
1411                 /* incorrect state... discard */
1412                 break;
1413         case SCTP_STATE_COOKIE_ECHOED:
1414                 /* incorrect state... discard */
1415                 break;
1416         case SCTP_STATE_OPEN:
1417                 /* incorrect state... discard */
1418                 break;
1419         case SCTP_STATE_EMPTY:
1420         case SCTP_STATE_INUSE:
1421         default:
1422                 /* incorrect state... discard */
1423                 return (-1);
1424                 break;
1425         }
1426         SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n");
1427         return (0);
1428 }
1429
1430 static struct sctp_tcb *
1431 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
1432     struct sockaddr *src, struct sockaddr *dst,
1433     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1434     struct sctp_inpcb *inp, struct sctp_nets **netp,
1435     struct sockaddr *init_src, int *notification,
1436     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1437     uint8_t mflowtype, uint32_t mflowid,
1438     uint32_t vrf_id, uint16_t port);
1439
1440
1441 /*
1442  * handle a state cookie for an existing association m: input packet mbuf
1443  * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a
1444  * "split" mbuf and the cookie signature does not exist offset: offset into
1445  * mbuf to the cookie-echo chunk
1446  */
1447 static struct sctp_tcb *
1448 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset,
1449     struct sockaddr *src, struct sockaddr *dst,
1450     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1451     struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp,
1452     struct sockaddr *init_src, int *notification,
1453     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1454     uint8_t mflowtype, uint32_t mflowid,
1455     uint32_t vrf_id, uint16_t port)
1456 {
1457         struct sctp_association *asoc;
1458         struct sctp_init_chunk *init_cp, init_buf;
1459         struct sctp_init_ack_chunk *initack_cp, initack_buf;
1460         struct sctp_nets *net;
1461         struct mbuf *op_err;
1462         int init_offset, initack_offset, i;
1463         int retval;
1464         int spec_flag = 0;
1465         uint32_t how_indx;
1466
1467 #if defined(SCTP_DETAILED_STR_STATS)
1468         int j;
1469
1470 #endif
1471
1472         net = *netp;
1473         /* I know that the TCB is non-NULL from the caller */
1474         asoc = &stcb->asoc;
1475         for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) {
1476                 if (asoc->cookie_how[how_indx] == 0)
1477                         break;
1478         }
1479         if (how_indx < sizeof(asoc->cookie_how)) {
1480                 asoc->cookie_how[how_indx] = 1;
1481         }
1482         if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
1483                 /* SHUTDOWN came in after sending INIT-ACK */
1484                 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination);
1485                 op_err = sctp_generate_cause(SCTP_CAUSE_COOKIE_IN_SHUTDOWN, "");
1486                 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
1487                     mflowtype, mflowid,
1488                     vrf_id, net->port);
1489                 if (how_indx < sizeof(asoc->cookie_how))
1490                         asoc->cookie_how[how_indx] = 2;
1491                 return (NULL);
1492         }
1493         /*
1494          * find and validate the INIT chunk in the cookie (peer's info) the
1495          * INIT should start after the cookie-echo header struct (chunk
1496          * header, state cookie header struct)
1497          */
1498         init_offset = offset += sizeof(struct sctp_cookie_echo_chunk);
1499
1500         init_cp = (struct sctp_init_chunk *)
1501             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
1502             (uint8_t *) & init_buf);
1503         if (init_cp == NULL) {
1504                 /* could not pull a INIT chunk in cookie */
1505                 return (NULL);
1506         }
1507         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
1508                 return (NULL);
1509         }
1510         /*
1511          * find and validate the INIT-ACK chunk in the cookie (my info) the
1512          * INIT-ACK follows the INIT chunk
1513          */
1514         initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
1515         initack_cp = (struct sctp_init_ack_chunk *)
1516             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
1517             (uint8_t *) & initack_buf);
1518         if (initack_cp == NULL) {
1519                 /* could not pull INIT-ACK chunk in cookie */
1520                 return (NULL);
1521         }
1522         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
1523                 return (NULL);
1524         }
1525         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1526             (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) {
1527                 /*
1528                  * case D in Section 5.2.4 Table 2: MMAA process accordingly
1529                  * to get into the OPEN state
1530                  */
1531                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1532                         /*-
1533                          * Opps, this means that we somehow generated two vtag's
1534                          * the same. I.e. we did:
1535                          *  Us               Peer
1536                          *   <---INIT(tag=a)------
1537                          *   ----INIT-ACK(tag=t)-->
1538                          *   ----INIT(tag=t)------> *1
1539                          *   <---INIT-ACK(tag=a)---
1540                          *   <----CE(tag=t)------------- *2
1541                          *
1542                          * At point *1 we should be generating a different
1543                          * tag t'. Which means we would throw away the CE and send
1544                          * ours instead. Basically this is case C (throw away side).
1545                          */
1546                         if (how_indx < sizeof(asoc->cookie_how))
1547                                 asoc->cookie_how[how_indx] = 17;
1548                         return (NULL);
1549
1550                 }
1551                 switch (SCTP_GET_STATE(asoc)) {
1552                 case SCTP_STATE_COOKIE_WAIT:
1553                 case SCTP_STATE_COOKIE_ECHOED:
1554                         /*
1555                          * INIT was sent but got a COOKIE_ECHO with the
1556                          * correct tags... just accept it...but we must
1557                          * process the init so that we can make sure we have
1558                          * the right seq no's.
1559                          */
1560                         /* First we must process the INIT !! */
1561                         retval = sctp_process_init(init_cp, stcb);
1562                         if (retval < 0) {
1563                                 if (how_indx < sizeof(asoc->cookie_how))
1564                                         asoc->cookie_how[how_indx] = 3;
1565                                 return (NULL);
1566                         }
1567                         /* we have already processed the INIT so no problem */
1568                         sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp,
1569                             stcb, net,
1570                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_13);
1571                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp,
1572                             stcb, net,
1573                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_14);
1574                         /* update current state */
1575                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)
1576                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1577                         else
1578                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1579
1580                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1581                         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1582                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1583                                     stcb->sctp_ep, stcb, asoc->primary_destination);
1584                         }
1585                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1586                         sctp_stop_all_cookie_timers(stcb);
1587                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1588                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1589                             (inp->sctp_socket->so_qlimit == 0)
1590                             ) {
1591 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1592                                 struct socket *so;
1593
1594 #endif
1595                                 /*
1596                                  * Here is where collision would go if we
1597                                  * did a connect() and instead got a
1598                                  * init/init-ack/cookie done before the
1599                                  * init-ack came back..
1600                                  */
1601                                 stcb->sctp_ep->sctp_flags |=
1602                                     SCTP_PCB_FLAGS_CONNECTED;
1603 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1604                                 so = SCTP_INP_SO(stcb->sctp_ep);
1605                                 atomic_add_int(&stcb->asoc.refcnt, 1);
1606                                 SCTP_TCB_UNLOCK(stcb);
1607                                 SCTP_SOCKET_LOCK(so, 1);
1608                                 SCTP_TCB_LOCK(stcb);
1609                                 atomic_add_int(&stcb->asoc.refcnt, -1);
1610                                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1611                                         SCTP_SOCKET_UNLOCK(so, 1);
1612                                         return (NULL);
1613                                 }
1614 #endif
1615                                 soisconnected(stcb->sctp_socket);
1616 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1617                                 SCTP_SOCKET_UNLOCK(so, 1);
1618 #endif
1619                         }
1620                         /* notify upper layer */
1621                         *notification = SCTP_NOTIFY_ASSOC_UP;
1622                         /*
1623                          * since we did not send a HB make sure we don't
1624                          * double things
1625                          */
1626                         net->hb_responded = 1;
1627                         net->RTO = sctp_calculate_rto(stcb, asoc, net,
1628                             &cookie->time_entered,
1629                             sctp_align_unsafe_makecopy,
1630                             SCTP_RTT_FROM_NON_DATA);
1631
1632                         if (stcb->asoc.sctp_autoclose_ticks &&
1633                             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) {
1634                                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
1635                                     inp, stcb, NULL);
1636                         }
1637                         break;
1638                 default:
1639                         /*
1640                          * we're in the OPEN state (or beyond), so peer must
1641                          * have simply lost the COOKIE-ACK
1642                          */
1643                         break;
1644                 }               /* end switch */
1645                 sctp_stop_all_cookie_timers(stcb);
1646                 /*
1647                  * We ignore the return code here.. not sure if we should
1648                  * somehow abort.. but we do have an existing asoc. This
1649                  * really should not fail.
1650                  */
1651                 if (sctp_load_addresses_from_init(stcb, m,
1652                     init_offset + sizeof(struct sctp_init_chunk),
1653                     initack_offset, src, dst, init_src)) {
1654                         if (how_indx < sizeof(asoc->cookie_how))
1655                                 asoc->cookie_how[how_indx] = 4;
1656                         return (NULL);
1657                 }
1658                 /* respond with a COOKIE-ACK */
1659                 sctp_toss_old_cookies(stcb, asoc);
1660                 sctp_send_cookie_ack(stcb);
1661                 if (how_indx < sizeof(asoc->cookie_how))
1662                         asoc->cookie_how[how_indx] = 5;
1663                 return (stcb);
1664         }
1665         if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1666             ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag &&
1667             cookie->tie_tag_my_vtag == 0 &&
1668             cookie->tie_tag_peer_vtag == 0) {
1669                 /*
1670                  * case C in Section 5.2.4 Table 2: XMOO silently discard
1671                  */
1672                 if (how_indx < sizeof(asoc->cookie_how))
1673                         asoc->cookie_how[how_indx] = 6;
1674                 return (NULL);
1675         }
1676         /*
1677          * If nat support, and the below and stcb is established, send back
1678          * a ABORT(colliding state) if we are established.
1679          */
1680         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) &&
1681             (asoc->peer_supports_nat) &&
1682             ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1683             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1684             (asoc->peer_vtag == 0)))) {
1685                 /*
1686                  * Special case - Peer's support nat. We may have two init's
1687                  * that we gave out the same tag on since one was not
1688                  * established.. i.e. we get INIT from host-1 behind the nat
1689                  * and we respond tag-a, we get a INIT from host-2 behind
1690                  * the nat and we get tag-a again. Then we bring up host-1
1691                  * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1).
1692                  * Now we have colliding state. We must send an abort here
1693                  * with colliding state indication.
1694                  */
1695                 op_err = sctp_generate_cause(SCTP_CAUSE_NAT_COLLIDING_STATE, "");
1696                 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err,
1697                     mflowtype, mflowid,
1698                     vrf_id, port);
1699                 return (NULL);
1700         }
1701         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1702             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1703             (asoc->peer_vtag == 0))) {
1704                 /*
1705                  * case B in Section 5.2.4 Table 2: MXAA or MOAA my info
1706                  * should be ok, re-accept peer info
1707                  */
1708                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1709                         /*
1710                          * Extension of case C. If we hit this, then the
1711                          * random number generator returned the same vtag
1712                          * when we first sent our INIT-ACK and when we later
1713                          * sent our INIT. The side with the seq numbers that
1714                          * are different will be the one that normnally
1715                          * would have hit case C. This in effect "extends"
1716                          * our vtags in this collision case to be 64 bits.
1717                          * The same collision could occur aka you get both
1718                          * vtag and seq number the same twice in a row.. but
1719                          * is much less likely. If it did happen then we
1720                          * would proceed through and bring up the assoc.. we
1721                          * may end up with the wrong stream setup however..
1722                          * which would be bad.. but there is no way to
1723                          * tell.. until we send on a stream that does not
1724                          * exist :-)
1725                          */
1726                         if (how_indx < sizeof(asoc->cookie_how))
1727                                 asoc->cookie_how[how_indx] = 7;
1728
1729                         return (NULL);
1730                 }
1731                 if (how_indx < sizeof(asoc->cookie_how))
1732                         asoc->cookie_how[how_indx] = 8;
1733                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net,
1734                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_15);
1735                 sctp_stop_all_cookie_timers(stcb);
1736                 /*
1737                  * since we did not send a HB make sure we don't double
1738                  * things
1739                  */
1740                 net->hb_responded = 1;
1741                 if (stcb->asoc.sctp_autoclose_ticks &&
1742                     sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
1743                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb,
1744                             NULL);
1745                 }
1746                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1747                 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
1748
1749                 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) {
1750                         /*
1751                          * Ok the peer probably discarded our data (if we
1752                          * echoed a cookie+data). So anything on the
1753                          * sent_queue should be marked for retransmit, we
1754                          * may not get something to kick us so it COULD
1755                          * still take a timeout to move these.. but it can't
1756                          * hurt to mark them.
1757                          */
1758                         struct sctp_tmit_chunk *chk;
1759
1760                         TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
1761                                 if (chk->sent < SCTP_DATAGRAM_RESEND) {
1762                                         chk->sent = SCTP_DATAGRAM_RESEND;
1763                                         sctp_flight_size_decrease(chk);
1764                                         sctp_total_flight_decrease(stcb, chk);
1765                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1766                                         spec_flag++;
1767                                 }
1768                         }
1769
1770                 }
1771                 /* process the INIT info (peer's info) */
1772                 retval = sctp_process_init(init_cp, stcb);
1773                 if (retval < 0) {
1774                         if (how_indx < sizeof(asoc->cookie_how))
1775                                 asoc->cookie_how[how_indx] = 9;
1776                         return (NULL);
1777                 }
1778                 if (sctp_load_addresses_from_init(stcb, m,
1779                     init_offset + sizeof(struct sctp_init_chunk),
1780                     initack_offset, src, dst, init_src)) {
1781                         if (how_indx < sizeof(asoc->cookie_how))
1782                                 asoc->cookie_how[how_indx] = 10;
1783                         return (NULL);
1784                 }
1785                 if ((asoc->state & SCTP_STATE_COOKIE_WAIT) ||
1786                     (asoc->state & SCTP_STATE_COOKIE_ECHOED)) {
1787                         *notification = SCTP_NOTIFY_ASSOC_UP;
1788
1789                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1790                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1791                             (inp->sctp_socket->so_qlimit == 0)) {
1792 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1793                                 struct socket *so;
1794
1795 #endif
1796                                 stcb->sctp_ep->sctp_flags |=
1797                                     SCTP_PCB_FLAGS_CONNECTED;
1798 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1799                                 so = SCTP_INP_SO(stcb->sctp_ep);
1800                                 atomic_add_int(&stcb->asoc.refcnt, 1);
1801                                 SCTP_TCB_UNLOCK(stcb);
1802                                 SCTP_SOCKET_LOCK(so, 1);
1803                                 SCTP_TCB_LOCK(stcb);
1804                                 atomic_add_int(&stcb->asoc.refcnt, -1);
1805                                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1806                                         SCTP_SOCKET_UNLOCK(so, 1);
1807                                         return (NULL);
1808                                 }
1809 #endif
1810                                 soisconnected(stcb->sctp_socket);
1811 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1812                                 SCTP_SOCKET_UNLOCK(so, 1);
1813 #endif
1814                         }
1815                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)
1816                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1817                         else
1818                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1819                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1820                 } else if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
1821                         SCTP_STAT_INCR_COUNTER32(sctps_restartestab);
1822                 } else {
1823                         SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1824                 }
1825                 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1826                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1827                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1828                             stcb->sctp_ep, stcb, asoc->primary_destination);
1829                 }
1830                 sctp_stop_all_cookie_timers(stcb);
1831                 sctp_toss_old_cookies(stcb, asoc);
1832                 sctp_send_cookie_ack(stcb);
1833                 if (spec_flag) {
1834                         /*
1835                          * only if we have retrans set do we do this. What
1836                          * this call does is get only the COOKIE-ACK out and
1837                          * then when we return the normal call to
1838                          * sctp_chunk_output will get the retrans out behind
1839                          * this.
1840                          */
1841                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED);
1842                 }
1843                 if (how_indx < sizeof(asoc->cookie_how))
1844                         asoc->cookie_how[how_indx] = 11;
1845
1846                 return (stcb);
1847         }
1848         if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1849             ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) &&
1850             cookie->tie_tag_my_vtag == asoc->my_vtag_nonce &&
1851             cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce &&
1852             cookie->tie_tag_peer_vtag != 0) {
1853                 struct sctpasochead *head;
1854
1855 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1856                 struct socket *so;
1857
1858 #endif
1859
1860                 if (asoc->peer_supports_nat) {
1861                         /*
1862                          * This is a gross gross hack. Just call the
1863                          * cookie_new code since we are allowing a duplicate
1864                          * association. I hope this works...
1865                          */
1866                         return (sctp_process_cookie_new(m, iphlen, offset, src, dst,
1867                             sh, cookie, cookie_len,
1868                             inp, netp, init_src, notification,
1869                             auth_skipped, auth_offset, auth_len,
1870                             mflowtype, mflowid,
1871                             vrf_id, port));
1872                 }
1873                 /*
1874                  * case A in Section 5.2.4 Table 2: XXMM (peer restarted)
1875                  */
1876                 /* temp code */
1877                 if (how_indx < sizeof(asoc->cookie_how))
1878                         asoc->cookie_how[how_indx] = 12;
1879                 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net,
1880                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
1881                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net,
1882                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_17);
1883
1884                 /* notify upper layer */
1885                 *notification = SCTP_NOTIFY_ASSOC_RESTART;
1886                 atomic_add_int(&stcb->asoc.refcnt, 1);
1887                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_OPEN) &&
1888                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
1889                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) {
1890                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1891                 }
1892                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
1893                         SCTP_STAT_INCR_GAUGE32(sctps_restartestab);
1894                 } else if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) {
1895                         SCTP_STAT_INCR_GAUGE32(sctps_collisionestab);
1896                 }
1897                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1898                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1899                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1900                             stcb->sctp_ep, stcb, asoc->primary_destination);
1901
1902                 } else if (!(asoc->state & SCTP_STATE_SHUTDOWN_SENT)) {
1903                         /* move to OPEN state, if not in SHUTDOWN_SENT */
1904                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1905                 }
1906                 asoc->pre_open_streams =
1907                     ntohs(initack_cp->init.num_outbound_streams);
1908                 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
1909                 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
1910                 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
1911
1912                 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
1913
1914                 asoc->str_reset_seq_in = asoc->init_seq_number;
1915
1916                 asoc->advanced_peer_ack_point = asoc->last_acked_seq;
1917                 if (asoc->mapping_array) {
1918                         memset(asoc->mapping_array, 0,
1919                             asoc->mapping_array_size);
1920                 }
1921                 if (asoc->nr_mapping_array) {
1922                         memset(asoc->nr_mapping_array, 0,
1923                             asoc->mapping_array_size);
1924                 }
1925                 SCTP_TCB_UNLOCK(stcb);
1926 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1927                 so = SCTP_INP_SO(stcb->sctp_ep);
1928                 SCTP_SOCKET_LOCK(so, 1);
1929 #endif
1930                 SCTP_INP_INFO_WLOCK();
1931                 SCTP_INP_WLOCK(stcb->sctp_ep);
1932                 SCTP_TCB_LOCK(stcb);
1933                 atomic_add_int(&stcb->asoc.refcnt, -1);
1934                 /* send up all the data */
1935                 SCTP_TCB_SEND_LOCK(stcb);
1936
1937                 sctp_report_all_outbound(stcb, 0, 1, SCTP_SO_LOCKED);
1938                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
1939                         stcb->asoc.strmout[i].chunks_on_queues = 0;
1940 #if defined(SCTP_DETAILED_STR_STATS)
1941                         for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
1942                                 asoc->strmout[i].abandoned_sent[j] = 0;
1943                                 asoc->strmout[i].abandoned_unsent[j] = 0;
1944                         }
1945 #else
1946                         asoc->strmout[i].abandoned_sent[0] = 0;
1947                         asoc->strmout[i].abandoned_unsent[0] = 0;
1948 #endif
1949                         stcb->asoc.strmout[i].stream_no = i;
1950                         stcb->asoc.strmout[i].next_sequence_send = 0;
1951                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
1952                 }
1953                 /* process the INIT-ACK info (my info) */
1954                 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
1955                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1956
1957                 /* pull from vtag hash */
1958                 LIST_REMOVE(stcb, sctp_asocs);
1959                 /* re-insert to new vtag position */
1960                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag,
1961                     SCTP_BASE_INFO(hashasocmark))];
1962                 /*
1963                  * put it in the bucket in the vtag hash of assoc's for the
1964                  * system
1965                  */
1966                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
1967
1968                 SCTP_TCB_SEND_UNLOCK(stcb);
1969                 SCTP_INP_WUNLOCK(stcb->sctp_ep);
1970                 SCTP_INP_INFO_WUNLOCK();
1971 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1972                 SCTP_SOCKET_UNLOCK(so, 1);
1973 #endif
1974                 asoc->total_flight = 0;
1975                 asoc->total_flight_count = 0;
1976                 /* process the INIT info (peer's info) */
1977                 retval = sctp_process_init(init_cp, stcb);
1978                 if (retval < 0) {
1979                         if (how_indx < sizeof(asoc->cookie_how))
1980                                 asoc->cookie_how[how_indx] = 13;
1981
1982                         return (NULL);
1983                 }
1984                 /*
1985                  * since we did not send a HB make sure we don't double
1986                  * things
1987                  */
1988                 net->hb_responded = 1;
1989
1990                 if (sctp_load_addresses_from_init(stcb, m,
1991                     init_offset + sizeof(struct sctp_init_chunk),
1992                     initack_offset, src, dst, init_src)) {
1993                         if (how_indx < sizeof(asoc->cookie_how))
1994                                 asoc->cookie_how[how_indx] = 14;
1995
1996                         return (NULL);
1997                 }
1998                 /* respond with a COOKIE-ACK */
1999                 sctp_stop_all_cookie_timers(stcb);
2000                 sctp_toss_old_cookies(stcb, asoc);
2001                 sctp_send_cookie_ack(stcb);
2002                 if (how_indx < sizeof(asoc->cookie_how))
2003                         asoc->cookie_how[how_indx] = 15;
2004
2005                 return (stcb);
2006         }
2007         if (how_indx < sizeof(asoc->cookie_how))
2008                 asoc->cookie_how[how_indx] = 16;
2009         /* all other cases... */
2010         return (NULL);
2011 }
2012
2013
2014 /*
2015  * handle a state cookie for a new association m: input packet mbuf chain--
2016  * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf
2017  * and the cookie signature does not exist offset: offset into mbuf to the
2018  * cookie-echo chunk length: length of the cookie chunk to: where the init
2019  * was from returns a new TCB
2020  */
2021 static struct sctp_tcb *
2022 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
2023     struct sockaddr *src, struct sockaddr *dst,
2024     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
2025     struct sctp_inpcb *inp, struct sctp_nets **netp,
2026     struct sockaddr *init_src, int *notification,
2027     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
2028     uint8_t mflowtype, uint32_t mflowid,
2029     uint32_t vrf_id, uint16_t port)
2030 {
2031         struct sctp_tcb *stcb;
2032         struct sctp_init_chunk *init_cp, init_buf;
2033         struct sctp_init_ack_chunk *initack_cp, initack_buf;
2034         union sctp_sockstore store;
2035         struct sctp_association *asoc;
2036         int init_offset, initack_offset, initack_limit;
2037         int retval;
2038         int error = 0;
2039         uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE];
2040
2041 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2042         struct socket *so;
2043
2044         so = SCTP_INP_SO(inp);
2045 #endif
2046
2047         /*
2048          * find and validate the INIT chunk in the cookie (peer's info) the
2049          * INIT should start after the cookie-echo header struct (chunk
2050          * header, state cookie header struct)
2051          */
2052         init_offset = offset + sizeof(struct sctp_cookie_echo_chunk);
2053         init_cp = (struct sctp_init_chunk *)
2054             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
2055             (uint8_t *) & init_buf);
2056         if (init_cp == NULL) {
2057                 /* could not pull a INIT chunk in cookie */
2058                 SCTPDBG(SCTP_DEBUG_INPUT1,
2059                     "process_cookie_new: could not pull INIT chunk hdr\n");
2060                 return (NULL);
2061         }
2062         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
2063                 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n");
2064                 return (NULL);
2065         }
2066         initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
2067         /*
2068          * find and validate the INIT-ACK chunk in the cookie (my info) the
2069          * INIT-ACK follows the INIT chunk
2070          */
2071         initack_cp = (struct sctp_init_ack_chunk *)
2072             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
2073             (uint8_t *) & initack_buf);
2074         if (initack_cp == NULL) {
2075                 /* could not pull INIT-ACK chunk in cookie */
2076                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n");
2077                 return (NULL);
2078         }
2079         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
2080                 return (NULL);
2081         }
2082         /*
2083          * NOTE: We can't use the INIT_ACK's chk_length to determine the
2084          * "initack_limit" value.  This is because the chk_length field
2085          * includes the length of the cookie, but the cookie is omitted when
2086          * the INIT and INIT_ACK are tacked onto the cookie...
2087          */
2088         initack_limit = offset + cookie_len;
2089
2090         /*
2091          * now that we know the INIT/INIT-ACK are in place, create a new TCB
2092          * and popluate
2093          */
2094
2095         /*
2096          * Here we do a trick, we set in NULL for the proc/thread argument.
2097          * We do this since in effect we only use the p argument when the
2098          * socket is unbound and we must do an implicit bind. Since we are
2099          * getting a cookie, we cannot be unbound.
2100          */
2101         stcb = sctp_aloc_assoc(inp, init_src, &error,
2102             ntohl(initack_cp->init.initiate_tag), vrf_id,
2103             (struct thread *)NULL
2104             );
2105         if (stcb == NULL) {
2106                 struct mbuf *op_err;
2107
2108                 /* memory problem? */
2109                 SCTPDBG(SCTP_DEBUG_INPUT1,
2110                     "process_cookie_new: no room for another TCB!\n");
2111                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2112                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2113                     src, dst, sh, op_err,
2114                     mflowtype, mflowid,
2115                     vrf_id, port);
2116                 return (NULL);
2117         }
2118         /* get the correct sctp_nets */
2119         if (netp)
2120                 *netp = sctp_findnet(stcb, init_src);
2121
2122         asoc = &stcb->asoc;
2123         /* get scope variables out of cookie */
2124         asoc->scope.ipv4_local_scope = cookie->ipv4_scope;
2125         asoc->scope.site_scope = cookie->site_scope;
2126         asoc->scope.local_scope = cookie->local_scope;
2127         asoc->scope.loopback_scope = cookie->loopback_scope;
2128
2129         if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) ||
2130             (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) {
2131                 struct mbuf *op_err;
2132
2133                 /*
2134                  * Houston we have a problem. The EP changed while the
2135                  * cookie was in flight. Only recourse is to abort the
2136                  * association.
2137                  */
2138                 atomic_add_int(&stcb->asoc.refcnt, 1);
2139                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2140                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2141                     src, dst, sh, op_err,
2142                     mflowtype, mflowid,
2143                     vrf_id, port);
2144 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2145                 SCTP_TCB_UNLOCK(stcb);
2146                 SCTP_SOCKET_LOCK(so, 1);
2147                 SCTP_TCB_LOCK(stcb);
2148 #endif
2149                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2150                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_18);
2151 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2152                 SCTP_SOCKET_UNLOCK(so, 1);
2153 #endif
2154                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2155                 return (NULL);
2156         }
2157         /* process the INIT-ACK info (my info) */
2158         asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
2159         asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
2160         asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
2161         asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
2162         asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
2163         asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
2164         asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
2165         asoc->str_reset_seq_in = asoc->init_seq_number;
2166
2167         asoc->advanced_peer_ack_point = asoc->last_acked_seq;
2168
2169         /* process the INIT info (peer's info) */
2170         if (netp)
2171                 retval = sctp_process_init(init_cp, stcb);
2172         else
2173                 retval = 0;
2174         if (retval < 0) {
2175                 atomic_add_int(&stcb->asoc.refcnt, 1);
2176 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2177                 SCTP_TCB_UNLOCK(stcb);
2178                 SCTP_SOCKET_LOCK(so, 1);
2179                 SCTP_TCB_LOCK(stcb);
2180 #endif
2181                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2182                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_19);
2183 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2184                 SCTP_SOCKET_UNLOCK(so, 1);
2185 #endif
2186                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2187                 return (NULL);
2188         }
2189         /* load all addresses */
2190         if (sctp_load_addresses_from_init(stcb, m,
2191             init_offset + sizeof(struct sctp_init_chunk), initack_offset,
2192             src, dst, init_src)) {
2193                 atomic_add_int(&stcb->asoc.refcnt, 1);
2194 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2195                 SCTP_TCB_UNLOCK(stcb);
2196                 SCTP_SOCKET_LOCK(so, 1);
2197                 SCTP_TCB_LOCK(stcb);
2198 #endif
2199                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2200                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_20);
2201 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2202                 SCTP_SOCKET_UNLOCK(so, 1);
2203 #endif
2204                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2205                 return (NULL);
2206         }
2207         /*
2208          * verify any preceding AUTH chunk that was skipped
2209          */
2210         /* pull the local authentication parameters from the cookie/init-ack */
2211         sctp_auth_get_cookie_params(stcb, m,
2212             initack_offset + sizeof(struct sctp_init_ack_chunk),
2213             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)));
2214         if (auth_skipped) {
2215                 struct sctp_auth_chunk *auth;
2216
2217                 auth = (struct sctp_auth_chunk *)
2218                     sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf);
2219                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) {
2220                         /* auth HMAC failed, dump the assoc and packet */
2221                         SCTPDBG(SCTP_DEBUG_AUTH1,
2222                             "COOKIE-ECHO: AUTH failed\n");
2223                         atomic_add_int(&stcb->asoc.refcnt, 1);
2224 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2225                         SCTP_TCB_UNLOCK(stcb);
2226                         SCTP_SOCKET_LOCK(so, 1);
2227                         SCTP_TCB_LOCK(stcb);
2228 #endif
2229                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2230                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_21);
2231 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2232                         SCTP_SOCKET_UNLOCK(so, 1);
2233 #endif
2234                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
2235                         return (NULL);
2236                 } else {
2237                         /* remaining chunks checked... good to go */
2238                         stcb->asoc.authenticated = 1;
2239                 }
2240         }
2241         /* update current state */
2242         SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2243         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
2244         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2245                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2246                     stcb->sctp_ep, stcb, asoc->primary_destination);
2247         }
2248         sctp_stop_all_cookie_timers(stcb);
2249         SCTP_STAT_INCR_COUNTER32(sctps_passiveestab);
2250         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2251
2252         /*
2253          * if we're doing ASCONFs, check to see if we have any new local
2254          * addresses that need to get added to the peer (eg. addresses
2255          * changed while cookie echo in flight).  This needs to be done
2256          * after we go to the OPEN state to do the correct asconf
2257          * processing. else, make sure we have the correct addresses in our
2258          * lists
2259          */
2260
2261         /* warning, we re-use sin, sin6, sa_store here! */
2262         /* pull in local_address (our "from" address) */
2263         switch (cookie->laddr_type) {
2264 #ifdef INET
2265         case SCTP_IPV4_ADDRESS:
2266                 /* source addr is IPv4 */
2267                 memset(&store.sin, 0, sizeof(struct sockaddr_in));
2268                 store.sin.sin_family = AF_INET;
2269                 store.sin.sin_len = sizeof(struct sockaddr_in);
2270                 store.sin.sin_addr.s_addr = cookie->laddress[0];
2271                 break;
2272 #endif
2273 #ifdef INET6
2274         case SCTP_IPV6_ADDRESS:
2275                 /* source addr is IPv6 */
2276                 memset(&store.sin6, 0, sizeof(struct sockaddr_in6));
2277                 store.sin6.sin6_family = AF_INET6;
2278                 store.sin6.sin6_len = sizeof(struct sockaddr_in6);
2279                 store.sin6.sin6_scope_id = cookie->scope_id;
2280                 memcpy(&store.sin6.sin6_addr, cookie->laddress, sizeof(struct in6_addr));
2281                 break;
2282 #endif
2283         default:
2284                 atomic_add_int(&stcb->asoc.refcnt, 1);
2285 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2286                 SCTP_TCB_UNLOCK(stcb);
2287                 SCTP_SOCKET_LOCK(so, 1);
2288                 SCTP_TCB_LOCK(stcb);
2289 #endif
2290                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2291                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_22);
2292 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2293                 SCTP_SOCKET_UNLOCK(so, 1);
2294 #endif
2295                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2296                 return (NULL);
2297         }
2298
2299         /* set up to notify upper layer */
2300         *notification = SCTP_NOTIFY_ASSOC_UP;
2301         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2302             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
2303             (inp->sctp_socket->so_qlimit == 0)) {
2304                 /*
2305                  * This is an endpoint that called connect() how it got a
2306                  * cookie that is NEW is a bit of a mystery. It must be that
2307                  * the INIT was sent, but before it got there.. a complete
2308                  * INIT/INIT-ACK/COOKIE arrived. But of course then it
2309                  * should have went to the other code.. not here.. oh well..
2310                  * a bit of protection is worth having..
2311                  */
2312                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2313 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2314                 atomic_add_int(&stcb->asoc.refcnt, 1);
2315                 SCTP_TCB_UNLOCK(stcb);
2316                 SCTP_SOCKET_LOCK(so, 1);
2317                 SCTP_TCB_LOCK(stcb);
2318                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2319                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
2320                         SCTP_SOCKET_UNLOCK(so, 1);
2321                         return (NULL);
2322                 }
2323 #endif
2324                 soisconnected(stcb->sctp_socket);
2325 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2326                 SCTP_SOCKET_UNLOCK(so, 1);
2327 #endif
2328         } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
2329             (inp->sctp_socket->so_qlimit)) {
2330                 /*
2331                  * We don't want to do anything with this one. Since it is
2332                  * the listening guy. The timer will get started for
2333                  * accepted connections in the caller.
2334                  */
2335                 ;
2336         }
2337         /* since we did not send a HB make sure we don't double things */
2338         if ((netp) && (*netp))
2339                 (*netp)->hb_responded = 1;
2340
2341         if (stcb->asoc.sctp_autoclose_ticks &&
2342             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2343                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL);
2344         }
2345         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
2346         if ((netp) && (*netp)) {
2347                 /* calculate the RTT and set the encaps port */
2348                 (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp,
2349                     &cookie->time_entered, sctp_align_unsafe_makecopy,
2350                     SCTP_RTT_FROM_NON_DATA);
2351                 (*netp)->port = port;
2352         }
2353         /* respond with a COOKIE-ACK */
2354         sctp_send_cookie_ack(stcb);
2355
2356         /*
2357          * check the address lists for any ASCONFs that need to be sent
2358          * AFTER the cookie-ack is sent
2359          */
2360         sctp_check_address_list(stcb, m,
2361             initack_offset + sizeof(struct sctp_init_ack_chunk),
2362             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)),
2363             &store.sa, cookie->local_scope, cookie->site_scope,
2364             cookie->ipv4_scope, cookie->loopback_scope);
2365
2366
2367         return (stcb);
2368 }
2369
2370 /*
2371  * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e
2372  * we NEED to make sure we are not already using the vtag. If so we
2373  * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit!
2374         head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag,
2375                                                             SCTP_BASE_INFO(hashasocmark))];
2376         LIST_FOREACH(stcb, head, sctp_asocs) {
2377                 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep))  {
2378                        -- SEND ABORT - TRY AGAIN --
2379                 }
2380         }
2381 */
2382
2383 /*
2384  * handles a COOKIE-ECHO message stcb: modified to either a new or left as
2385  * existing (non-NULL) TCB
2386  */
2387 static struct mbuf *
2388 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset,
2389     struct sockaddr *src, struct sockaddr *dst,
2390     struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp,
2391     struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp,
2392     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
2393     struct sctp_tcb **locked_tcb,
2394     uint8_t mflowtype, uint32_t mflowid,
2395     uint32_t vrf_id, uint16_t port)
2396 {
2397         struct sctp_state_cookie *cookie;
2398         struct sctp_tcb *l_stcb = *stcb;
2399         struct sctp_inpcb *l_inp;
2400         struct sockaddr *to;
2401         struct sctp_pcb *ep;
2402         struct mbuf *m_sig;
2403         uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE];
2404         uint8_t *sig;
2405         uint8_t cookie_ok = 0;
2406         unsigned int sig_offset, cookie_offset;
2407         unsigned int cookie_len;
2408         struct timeval now;
2409         struct timeval time_expires;
2410         int notification = 0;
2411         struct sctp_nets *netl;
2412         int had_a_existing_tcb = 0;
2413         int send_int_conf = 0;
2414
2415 #ifdef INET
2416         struct sockaddr_in sin;
2417
2418 #endif
2419 #ifdef INET6
2420         struct sockaddr_in6 sin6;
2421
2422 #endif
2423
2424         SCTPDBG(SCTP_DEBUG_INPUT2,
2425             "sctp_handle_cookie: handling COOKIE-ECHO\n");
2426
2427         if (inp_p == NULL) {
2428                 return (NULL);
2429         }
2430         cookie = &cp->cookie;
2431         cookie_offset = offset + sizeof(struct sctp_chunkhdr);
2432         cookie_len = ntohs(cp->ch.chunk_length);
2433
2434         if ((cookie->peerport != sh->src_port) &&
2435             (cookie->myport != sh->dest_port) &&
2436             (cookie->my_vtag != sh->v_tag)) {
2437                 /*
2438                  * invalid ports or bad tag.  Note that we always leave the
2439                  * v_tag in the header in network order and when we stored
2440                  * it in the my_vtag slot we also left it in network order.
2441                  * This maintains the match even though it may be in the
2442                  * opposite byte order of the machine :->
2443                  */
2444                 return (NULL);
2445         }
2446         if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) +
2447             sizeof(struct sctp_init_chunk) +
2448             sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) {
2449                 /* cookie too small */
2450                 return (NULL);
2451         }
2452         /*
2453          * split off the signature into its own mbuf (since it should not be
2454          * calculated in the sctp_hmac_m() call).
2455          */
2456         sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE;
2457         m_sig = m_split(m, sig_offset, M_NOWAIT);
2458         if (m_sig == NULL) {
2459                 /* out of memory or ?? */
2460                 return (NULL);
2461         }
2462 #ifdef SCTP_MBUF_LOGGING
2463         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
2464                 sctp_log_mbc(m_sig, SCTP_MBUF_SPLIT);
2465         }
2466 #endif
2467
2468         /*
2469          * compute the signature/digest for the cookie
2470          */
2471         ep = &(*inp_p)->sctp_ep;
2472         l_inp = *inp_p;
2473         if (l_stcb) {
2474                 SCTP_TCB_UNLOCK(l_stcb);
2475         }
2476         SCTP_INP_RLOCK(l_inp);
2477         if (l_stcb) {
2478                 SCTP_TCB_LOCK(l_stcb);
2479         }
2480         /* which cookie is it? */
2481         if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) &&
2482             (ep->current_secret_number != ep->last_secret_number)) {
2483                 /* it's the old cookie */
2484                 (void)sctp_hmac_m(SCTP_HMAC,
2485                     (uint8_t *) ep->secret_key[(int)ep->last_secret_number],
2486                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2487         } else {
2488                 /* it's the current cookie */
2489                 (void)sctp_hmac_m(SCTP_HMAC,
2490                     (uint8_t *) ep->secret_key[(int)ep->current_secret_number],
2491                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2492         }
2493         /* get the signature */
2494         SCTP_INP_RUNLOCK(l_inp);
2495         sig = (uint8_t *) sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *) & tmp_sig);
2496         if (sig == NULL) {
2497                 /* couldn't find signature */
2498                 sctp_m_freem(m_sig);
2499                 return (NULL);
2500         }
2501         /* compare the received digest with the computed digest */
2502         if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) {
2503                 /* try the old cookie? */
2504                 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) &&
2505                     (ep->current_secret_number != ep->last_secret_number)) {
2506                         /* compute digest with old */
2507                         (void)sctp_hmac_m(SCTP_HMAC,
2508                             (uint8_t *) ep->secret_key[(int)ep->last_secret_number],
2509                             SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2510                         /* compare */
2511                         if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0)
2512                                 cookie_ok = 1;
2513                 }
2514         } else {
2515                 cookie_ok = 1;
2516         }
2517
2518         /*
2519          * Now before we continue we must reconstruct our mbuf so that
2520          * normal processing of any other chunks will work.
2521          */
2522         {
2523                 struct mbuf *m_at;
2524
2525                 m_at = m;
2526                 while (SCTP_BUF_NEXT(m_at) != NULL) {
2527                         m_at = SCTP_BUF_NEXT(m_at);
2528                 }
2529                 SCTP_BUF_NEXT(m_at) = m_sig;
2530         }
2531
2532         if (cookie_ok == 0) {
2533                 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n");
2534                 SCTPDBG(SCTP_DEBUG_INPUT2,
2535                     "offset = %u, cookie_offset = %u, sig_offset = %u\n",
2536                     (uint32_t) offset, cookie_offset, sig_offset);
2537                 return (NULL);
2538         }
2539         /*
2540          * check the cookie timestamps to be sure it's not stale
2541          */
2542         (void)SCTP_GETTIME_TIMEVAL(&now);
2543         /* Expire time is in Ticks, so we convert to seconds */
2544         time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life);
2545         time_expires.tv_usec = cookie->time_entered.tv_usec;
2546         /*
2547          * TODO sctp_constants.h needs alternative time macros when _KERNEL
2548          * is undefined.
2549          */
2550         if (timevalcmp(&now, &time_expires, >)) {
2551                 /* cookie is stale! */
2552                 struct mbuf *op_err;
2553                 struct sctp_stale_cookie_msg *scm;
2554                 uint32_t tim;
2555
2556                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_stale_cookie_msg),
2557                     0, M_NOWAIT, 1, MT_DATA);
2558                 if (op_err == NULL) {
2559                         /* FOOBAR */
2560                         return (NULL);
2561                 }
2562                 /* Set the len */
2563                 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_stale_cookie_msg);
2564                 scm = mtod(op_err, struct sctp_stale_cookie_msg *);
2565                 scm->ph.param_type = htons(SCTP_CAUSE_STALE_COOKIE);
2566                 scm->ph.param_length = htons((sizeof(struct sctp_paramhdr) +
2567                     (sizeof(uint32_t))));
2568                 /* seconds to usec */
2569                 tim = (now.tv_sec - time_expires.tv_sec) * 1000000;
2570                 /* add in usec */
2571                 if (tim == 0)
2572                         tim = now.tv_usec - cookie->time_entered.tv_usec;
2573                 scm->time_usec = htonl(tim);
2574                 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
2575                     mflowtype, mflowid,
2576                     vrf_id, port);
2577                 return (NULL);
2578         }
2579         /*
2580          * Now we must see with the lookup address if we have an existing
2581          * asoc. This will only happen if we were in the COOKIE-WAIT state
2582          * and a INIT collided with us and somewhere the peer sent the
2583          * cookie on another address besides the single address our assoc
2584          * had for him. In this case we will have one of the tie-tags set at
2585          * least AND the address field in the cookie can be used to look it
2586          * up.
2587          */
2588         to = NULL;
2589         switch (cookie->addr_type) {
2590 #ifdef INET6
2591         case SCTP_IPV6_ADDRESS:
2592                 memset(&sin6, 0, sizeof(sin6));
2593                 sin6.sin6_family = AF_INET6;
2594                 sin6.sin6_len = sizeof(sin6);
2595                 sin6.sin6_port = sh->src_port;
2596                 sin6.sin6_scope_id = cookie->scope_id;
2597                 memcpy(&sin6.sin6_addr.s6_addr, cookie->address,
2598                     sizeof(sin6.sin6_addr.s6_addr));
2599                 to = (struct sockaddr *)&sin6;
2600                 break;
2601 #endif
2602 #ifdef INET
2603         case SCTP_IPV4_ADDRESS:
2604                 memset(&sin, 0, sizeof(sin));
2605                 sin.sin_family = AF_INET;
2606                 sin.sin_len = sizeof(sin);
2607                 sin.sin_port = sh->src_port;
2608                 sin.sin_addr.s_addr = cookie->address[0];
2609                 to = (struct sockaddr *)&sin;
2610                 break;
2611 #endif
2612         default:
2613                 /* This should not happen */
2614                 return (NULL);
2615         }
2616         if (*stcb == NULL) {
2617                 /* Yep, lets check */
2618                 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL);
2619                 if (*stcb == NULL) {
2620                         /*
2621                          * We should have only got back the same inp. If we
2622                          * got back a different ep we have a problem. The
2623                          * original findep got back l_inp and now
2624                          */
2625                         if (l_inp != *inp_p) {
2626                                 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n");
2627                         }
2628                 } else {
2629                         if (*locked_tcb == NULL) {
2630                                 /*
2631                                  * In this case we found the assoc only
2632                                  * after we locked the create lock. This
2633                                  * means we are in a colliding case and we
2634                                  * must make sure that we unlock the tcb if
2635                                  * its one of the cases where we throw away
2636                                  * the incoming packets.
2637                                  */
2638                                 *locked_tcb = *stcb;
2639
2640                                 /*
2641                                  * We must also increment the inp ref count
2642                                  * since the ref_count flags was set when we
2643                                  * did not find the TCB, now we found it
2644                                  * which reduces the refcount.. we must
2645                                  * raise it back out to balance it all :-)
2646                                  */
2647                                 SCTP_INP_INCR_REF((*stcb)->sctp_ep);
2648                                 if ((*stcb)->sctp_ep != l_inp) {
2649                                         SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n",
2650                                             (void *)(*stcb)->sctp_ep, (void *)l_inp);
2651                                 }
2652                         }
2653                 }
2654         }
2655         cookie_len -= SCTP_SIGNATURE_SIZE;
2656         if (*stcb == NULL) {
2657                 /* this is the "normal" case... get a new TCB */
2658                 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh,
2659                     cookie, cookie_len, *inp_p,
2660                     netp, to, &notification,
2661                     auth_skipped, auth_offset, auth_len,
2662                     mflowtype, mflowid,
2663                     vrf_id, port);
2664         } else {
2665                 /* this is abnormal... cookie-echo on existing TCB */
2666                 had_a_existing_tcb = 1;
2667                 *stcb = sctp_process_cookie_existing(m, iphlen, offset,
2668                     src, dst, sh,
2669                     cookie, cookie_len, *inp_p, *stcb, netp, to,
2670                     &notification, auth_skipped, auth_offset, auth_len,
2671                     mflowtype, mflowid,
2672                     vrf_id, port);
2673         }
2674
2675         if (*stcb == NULL) {
2676                 /* still no TCB... must be bad cookie-echo */
2677                 return (NULL);
2678         }
2679         if ((*netp != NULL) && (mflowtype != M_HASHTYPE_NONE)) {
2680                 (*netp)->flowtype = mflowtype;
2681         }
2682         /*
2683          * Ok, we built an association so confirm the address we sent the
2684          * INIT-ACK to.
2685          */
2686         netl = sctp_findnet(*stcb, to);
2687         /*
2688          * This code should in theory NOT run but
2689          */
2690         if (netl == NULL) {
2691                 /* TSNH! Huh, why do I need to add this address here? */
2692                 if (sctp_add_remote_addr(*stcb, to, NULL, SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) {
2693                         return (NULL);
2694                 }
2695                 netl = sctp_findnet(*stcb, to);
2696         }
2697         if (netl) {
2698                 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) {
2699                         netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
2700                         (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL,
2701                             netl);
2702                         send_int_conf = 1;
2703                 }
2704         }
2705         sctp_start_net_timers(*stcb);
2706         if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
2707                 if (!had_a_existing_tcb ||
2708                     (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
2709                         /*
2710                          * If we have a NEW cookie or the connect never
2711                          * reached the connected state during collision we
2712                          * must do the TCP accept thing.
2713                          */
2714                         struct socket *so, *oso;
2715                         struct sctp_inpcb *inp;
2716
2717                         if (notification == SCTP_NOTIFY_ASSOC_RESTART) {
2718                                 /*
2719                                  * For a restart we will keep the same
2720                                  * socket, no need to do anything. I THINK!!
2721                                  */
2722                                 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2723                                 if (send_int_conf) {
2724                                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2725                                             (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2726                                 }
2727                                 return (m);
2728                         }
2729                         oso = (*inp_p)->sctp_socket;
2730                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2731                         SCTP_TCB_UNLOCK((*stcb));
2732                         CURVNET_SET(oso->so_vnet);
2733                         so = sonewconn(oso, 0
2734                             );
2735                         CURVNET_RESTORE();
2736                         SCTP_TCB_LOCK((*stcb));
2737                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2738
2739                         if (so == NULL) {
2740                                 struct mbuf *op_err;
2741
2742 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2743                                 struct socket *pcb_so;
2744
2745 #endif
2746                                 /* Too many sockets */
2747                                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n");
2748                                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2749                                 sctp_abort_association(*inp_p, NULL, m, iphlen,
2750                                     src, dst, sh, op_err,
2751                                     mflowtype, mflowid,
2752                                     vrf_id, port);
2753 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2754                                 pcb_so = SCTP_INP_SO(*inp_p);
2755                                 atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2756                                 SCTP_TCB_UNLOCK((*stcb));
2757                                 SCTP_SOCKET_LOCK(pcb_so, 1);
2758                                 SCTP_TCB_LOCK((*stcb));
2759                                 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2760 #endif
2761                                 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC,
2762                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_23);
2763 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2764                                 SCTP_SOCKET_UNLOCK(pcb_so, 1);
2765 #endif
2766                                 return (NULL);
2767                         }
2768                         inp = (struct sctp_inpcb *)so->so_pcb;
2769                         SCTP_INP_INCR_REF(inp);
2770                         /*
2771                          * We add the unbound flag here so that if we get an
2772                          * soabort() before we get the move_pcb done, we
2773                          * will properly cleanup.
2774                          */
2775                         inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE |
2776                             SCTP_PCB_FLAGS_CONNECTED |
2777                             SCTP_PCB_FLAGS_IN_TCPPOOL |
2778                             SCTP_PCB_FLAGS_UNBOUND |
2779                             (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) |
2780                             SCTP_PCB_FLAGS_DONT_WAKE);
2781                         inp->sctp_features = (*inp_p)->sctp_features;
2782                         inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features;
2783                         inp->sctp_socket = so;
2784                         inp->sctp_frag_point = (*inp_p)->sctp_frag_point;
2785                         inp->max_cwnd = (*inp_p)->max_cwnd;
2786                         inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off;
2787                         inp->ecn_supported = (*inp_p)->ecn_supported;
2788                         inp->prsctp_supported = (*inp_p)->prsctp_supported;
2789                         inp->auth_supported = (*inp_p)->auth_supported;
2790                         inp->asconf_supported = (*inp_p)->asconf_supported;
2791                         inp->reconfig_supported = (*inp_p)->reconfig_supported;
2792                         inp->nrsack_supported = (*inp_p)->nrsack_supported;
2793                         inp->pktdrop_supported = (*inp_p)->pktdrop_supported;
2794                         inp->partial_delivery_point = (*inp_p)->partial_delivery_point;
2795                         inp->sctp_context = (*inp_p)->sctp_context;
2796                         inp->local_strreset_support = (*inp_p)->local_strreset_support;
2797                         inp->inp_starting_point_for_iterator = NULL;
2798                         /*
2799                          * copy in the authentication parameters from the
2800                          * original endpoint
2801                          */
2802                         if (inp->sctp_ep.local_hmacs)
2803                                 sctp_free_hmaclist(inp->sctp_ep.local_hmacs);
2804                         inp->sctp_ep.local_hmacs =
2805                             sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs);
2806                         if (inp->sctp_ep.local_auth_chunks)
2807                                 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks);
2808                         inp->sctp_ep.local_auth_chunks =
2809                             sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks);
2810
2811                         /*
2812                          * Now we must move it from one hash table to
2813                          * another and get the tcb in the right place.
2814                          */
2815
2816                         /*
2817                          * This is where the one-2-one socket is put into
2818                          * the accept state waiting for the accept!
2819                          */
2820                         if (*stcb) {
2821                                 (*stcb)->asoc.state |= SCTP_STATE_IN_ACCEPT_QUEUE;
2822                         }
2823                         sctp_move_pcb_and_assoc(*inp_p, inp, *stcb);
2824
2825                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2826                         SCTP_TCB_UNLOCK((*stcb));
2827
2828                         sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb,
2829                             0);
2830                         SCTP_TCB_LOCK((*stcb));
2831                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2832
2833
2834                         /*
2835                          * now we must check to see if we were aborted while
2836                          * the move was going on and the lock/unlock
2837                          * happened.
2838                          */
2839                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
2840                                 /*
2841                                  * yep it was, we leave the assoc attached
2842                                  * to the socket since the sctp_inpcb_free()
2843                                  * call will send an abort for us.
2844                                  */
2845                                 SCTP_INP_DECR_REF(inp);
2846                                 return (NULL);
2847                         }
2848                         SCTP_INP_DECR_REF(inp);
2849                         /* Switch over to the new guy */
2850                         *inp_p = inp;
2851                         sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2852                         if (send_int_conf) {
2853                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2854                                     (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2855                         }
2856                         /*
2857                          * Pull it from the incomplete queue and wake the
2858                          * guy
2859                          */
2860 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2861                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2862                         SCTP_TCB_UNLOCK((*stcb));
2863                         SCTP_SOCKET_LOCK(so, 1);
2864 #endif
2865                         soisconnected(so);
2866 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2867                         SCTP_TCB_LOCK((*stcb));
2868                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2869                         SCTP_SOCKET_UNLOCK(so, 1);
2870 #endif
2871                         return (m);
2872                 }
2873         }
2874         if (notification) {
2875                 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2876         }
2877         if (send_int_conf) {
2878                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2879                     (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2880         }
2881         return (m);
2882 }
2883
2884 static void
2885 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED,
2886     struct sctp_tcb *stcb, struct sctp_nets *net)
2887 {
2888         /* cp must not be used, others call this without a c-ack :-) */
2889         struct sctp_association *asoc;
2890
2891         SCTPDBG(SCTP_DEBUG_INPUT2,
2892             "sctp_handle_cookie_ack: handling COOKIE-ACK\n");
2893         if ((stcb == NULL) || (net == NULL)) {
2894                 return;
2895         }
2896         asoc = &stcb->asoc;
2897
2898         sctp_stop_all_cookie_timers(stcb);
2899         /* process according to association state */
2900         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) {
2901                 /* state change only needed when I am in right state */
2902                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2903                 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
2904                 sctp_start_net_timers(stcb);
2905                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2906                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2907                             stcb->sctp_ep, stcb, asoc->primary_destination);
2908
2909                 }
2910                 /* update RTO */
2911                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
2912                 SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2913                 if (asoc->overall_error_count == 0) {
2914                         net->RTO = sctp_calculate_rto(stcb, asoc, net,
2915                             &asoc->time_entered, sctp_align_safe_nocopy,
2916                             SCTP_RTT_FROM_NON_DATA);
2917                 }
2918                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
2919                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2920                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2921                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
2922 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2923                         struct socket *so;
2924
2925 #endif
2926                         stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2927 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2928                         so = SCTP_INP_SO(stcb->sctp_ep);
2929                         atomic_add_int(&stcb->asoc.refcnt, 1);
2930                         SCTP_TCB_UNLOCK(stcb);
2931                         SCTP_SOCKET_LOCK(so, 1);
2932                         SCTP_TCB_LOCK(stcb);
2933                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
2934 #endif
2935                         if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) {
2936                                 soisconnected(stcb->sctp_socket);
2937                         }
2938 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2939                         SCTP_SOCKET_UNLOCK(so, 1);
2940 #endif
2941                 }
2942                 /*
2943                  * since we did not send a HB make sure we don't double
2944                  * things
2945                  */
2946                 net->hb_responded = 1;
2947
2948                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
2949                         /*
2950                          * We don't need to do the asconf thing, nor hb or
2951                          * autoclose if the socket is closed.
2952                          */
2953                         goto closed_socket;
2954                 }
2955                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
2956                     stcb, net);
2957
2958
2959                 if (stcb->asoc.sctp_autoclose_ticks &&
2960                     sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2961                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
2962                             stcb->sctp_ep, stcb, NULL);
2963                 }
2964                 /*
2965                  * send ASCONF if parameters are pending and ASCONFs are
2966                  * allowed (eg. addresses changed when init/cookie echo were
2967                  * in flight)
2968                  */
2969                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) &&
2970                     (stcb->asoc.asconf_supported == 1) &&
2971                     (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) {
2972 #ifdef SCTP_TIMER_BASED_ASCONF
2973                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF,
2974                             stcb->sctp_ep, stcb,
2975                             stcb->asoc.primary_destination);
2976 #else
2977                         sctp_send_asconf(stcb, stcb->asoc.primary_destination,
2978                             SCTP_ADDR_NOT_LOCKED);
2979 #endif
2980                 }
2981         }
2982 closed_socket:
2983         /* Toss the cookie if I can */
2984         sctp_toss_old_cookies(stcb, asoc);
2985         if (!TAILQ_EMPTY(&asoc->sent_queue)) {
2986                 /* Restart the timer if we have pending data */
2987                 struct sctp_tmit_chunk *chk;
2988
2989                 chk = TAILQ_FIRST(&asoc->sent_queue);
2990                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
2991         }
2992 }
2993
2994 static void
2995 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp,
2996     struct sctp_tcb *stcb)
2997 {
2998         struct sctp_nets *net;
2999         struct sctp_tmit_chunk *lchk;
3000         struct sctp_ecne_chunk bkup;
3001         uint8_t override_bit;
3002         uint32_t tsn, window_data_tsn;
3003         int len;
3004         unsigned int pkt_cnt;
3005
3006         len = ntohs(cp->ch.chunk_length);
3007         if ((len != sizeof(struct sctp_ecne_chunk)) &&
3008             (len != sizeof(struct old_sctp_ecne_chunk))) {
3009                 return;
3010         }
3011         if (len == sizeof(struct old_sctp_ecne_chunk)) {
3012                 /* Its the old format */
3013                 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk));
3014                 bkup.num_pkts_since_cwr = htonl(1);
3015                 cp = &bkup;
3016         }
3017         SCTP_STAT_INCR(sctps_recvecne);
3018         tsn = ntohl(cp->tsn);
3019         pkt_cnt = ntohl(cp->num_pkts_since_cwr);
3020         lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead);
3021         if (lchk == NULL) {
3022                 window_data_tsn = stcb->asoc.sending_seq - 1;
3023         } else {
3024                 window_data_tsn = lchk->rec.data.TSN_seq;
3025         }
3026
3027         /* Find where it was sent to if possible. */
3028         net = NULL;
3029         TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) {
3030                 if (lchk->rec.data.TSN_seq == tsn) {
3031                         net = lchk->whoTo;
3032                         net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send;
3033                         break;
3034                 }
3035                 if (SCTP_TSN_GT(lchk->rec.data.TSN_seq, tsn)) {
3036                         break;
3037                 }
3038         }
3039         if (net == NULL) {
3040                 /*
3041                  * What to do. A previous send of a CWR was possibly lost.
3042                  * See how old it is, we may have it marked on the actual
3043                  * net.
3044                  */
3045                 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
3046                         if (tsn == net->last_cwr_tsn) {
3047                                 /* Found him, send it off */
3048                                 break;
3049                         }
3050                 }
3051                 if (net == NULL) {
3052                         /*
3053                          * If we reach here, we need to send a special CWR
3054                          * that says hey, we did this a long time ago and
3055                          * you lost the response.
3056                          */
3057                         net = TAILQ_FIRST(&stcb->asoc.nets);
3058                         if (net == NULL) {
3059                                 /* TSNH */
3060                                 return;
3061                         }
3062                         override_bit = SCTP_CWR_REDUCE_OVERRIDE;
3063                 } else {
3064                         override_bit = 0;
3065                 }
3066         } else {
3067                 override_bit = 0;
3068         }
3069         if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) &&
3070             ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
3071                 /*
3072                  * JRS - Use the congestion control given in the pluggable
3073                  * CC module
3074                  */
3075                 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt);
3076                 /*
3077                  * We reduce once every RTT. So we will only lower cwnd at
3078                  * the next sending seq i.e. the window_data_tsn
3079                  */
3080                 net->cwr_window_tsn = window_data_tsn;
3081                 net->ecn_ce_pkt_cnt += pkt_cnt;
3082                 net->lost_cnt = pkt_cnt;
3083                 net->last_cwr_tsn = tsn;
3084         } else {
3085                 override_bit |= SCTP_CWR_IN_SAME_WINDOW;
3086                 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) &&
3087                     ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
3088                         /*
3089                          * Another loss in the same window update how many
3090                          * marks/packets lost we have had.
3091                          */
3092                         int cnt = 1;
3093
3094                         if (pkt_cnt > net->lost_cnt) {
3095                                 /* Should be the case */
3096                                 cnt = (pkt_cnt - net->lost_cnt);
3097                                 net->ecn_ce_pkt_cnt += cnt;
3098                         }
3099                         net->lost_cnt = pkt_cnt;
3100                         net->last_cwr_tsn = tsn;
3101                         /*
3102                          * Most CC functions will ignore this call, since we
3103                          * are in-window yet of the initial CE the peer saw.
3104                          */
3105                         stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt);
3106                 }
3107         }
3108         /*
3109          * We always send a CWR this way if our previous one was lost our
3110          * peer will get an update, or if it is not time again to reduce we
3111          * still get the cwr to the peer. Note we set the override when we
3112          * could not find the TSN on the chunk or the destination network.
3113          */
3114         sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit);
3115 }
3116
3117 static void
3118 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net)
3119 {
3120         /*
3121          * Here we get a CWR from the peer. We must look in the outqueue and
3122          * make sure that we have a covered ECNE in the control chunk part.
3123          * If so remove it.
3124          */
3125         struct sctp_tmit_chunk *chk;
3126         struct sctp_ecne_chunk *ecne;
3127         int override;
3128         uint32_t cwr_tsn;
3129
3130         cwr_tsn = ntohl(cp->tsn);
3131         override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE;
3132         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
3133                 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) {
3134                         continue;
3135                 }
3136                 if ((override == 0) && (chk->whoTo != net)) {
3137                         /* Must be from the right src unless override is set */
3138                         continue;
3139                 }
3140                 ecne = mtod(chk->data, struct sctp_ecne_chunk *);
3141                 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) {
3142                         /* this covers this ECNE, we can remove it */
3143                         stcb->asoc.ecn_echo_cnt_onq--;
3144                         TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk,
3145                             sctp_next);
3146                         sctp_m_freem(chk->data);
3147                         chk->data = NULL;
3148                         stcb->asoc.ctrl_queue_cnt--;
3149                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3150                         if (override == 0) {
3151                                 break;
3152                         }
3153                 }
3154         }
3155 }
3156
3157 static void
3158 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED,
3159     struct sctp_tcb *stcb, struct sctp_nets *net)
3160 {
3161         struct sctp_association *asoc;
3162
3163 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3164         struct socket *so;
3165
3166 #endif
3167
3168         SCTPDBG(SCTP_DEBUG_INPUT2,
3169             "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n");
3170         if (stcb == NULL)
3171                 return;
3172
3173         asoc = &stcb->asoc;
3174         /* process according to association state */
3175         if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
3176                 /* unexpected SHUTDOWN-COMPLETE... so ignore... */
3177                 SCTPDBG(SCTP_DEBUG_INPUT2,
3178                     "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n");
3179                 SCTP_TCB_UNLOCK(stcb);
3180                 return;
3181         }
3182         /* notify upper layer protocol */
3183         if (stcb->sctp_socket) {
3184                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
3185         }
3186 #ifdef INVARIANTS
3187         if (!TAILQ_EMPTY(&asoc->send_queue) ||
3188             !TAILQ_EMPTY(&asoc->sent_queue) ||
3189             !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
3190                 panic("Queues are not empty when handling SHUTDOWN-COMPLETE");
3191         }
3192 #endif
3193         /* stop the timer */
3194         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net,
3195             SCTP_FROM_SCTP_INPUT + SCTP_LOC_24);
3196         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
3197         /* free the TCB */
3198         SCTPDBG(SCTP_DEBUG_INPUT2,
3199             "sctp_handle_shutdown_complete: calls free-asoc\n");
3200 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3201         so = SCTP_INP_SO(stcb->sctp_ep);
3202         atomic_add_int(&stcb->asoc.refcnt, 1);
3203         SCTP_TCB_UNLOCK(stcb);
3204         SCTP_SOCKET_LOCK(so, 1);
3205         SCTP_TCB_LOCK(stcb);
3206         atomic_subtract_int(&stcb->asoc.refcnt, 1);
3207 #endif
3208         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
3209             SCTP_FROM_SCTP_INPUT + SCTP_LOC_25);
3210 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3211         SCTP_SOCKET_UNLOCK(so, 1);
3212 #endif
3213         return;
3214 }
3215
3216 static int
3217 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc,
3218     struct sctp_nets *net, uint8_t flg)
3219 {
3220         switch (desc->chunk_type) {
3221         case SCTP_DATA:
3222                 /* find the tsn to resend (possibly */
3223                 {
3224                         uint32_t tsn;
3225                         struct sctp_tmit_chunk *tp1;
3226
3227                         tsn = ntohl(desc->tsn_ifany);
3228                         TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3229                                 if (tp1->rec.data.TSN_seq == tsn) {
3230                                         /* found it */
3231                                         break;
3232                                 }
3233                                 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, tsn)) {
3234                                         /* not found */
3235                                         tp1 = NULL;
3236                                         break;
3237                                 }
3238                         }
3239                         if (tp1 == NULL) {
3240                                 /*
3241                                  * Do it the other way , aka without paying
3242                                  * attention to queue seq order.
3243                                  */
3244                                 SCTP_STAT_INCR(sctps_pdrpdnfnd);
3245                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3246                                         if (tp1->rec.data.TSN_seq == tsn) {
3247                                                 /* found it */
3248                                                 break;
3249                                         }
3250                                 }
3251                         }
3252                         if (tp1 == NULL) {
3253                                 SCTP_STAT_INCR(sctps_pdrptsnnf);
3254                         }
3255                         if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) {
3256                                 uint8_t *ddp;
3257
3258                                 if (((flg & SCTP_BADCRC) == 0) &&
3259                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3260                                         return (0);
3261                                 }
3262                                 if ((stcb->asoc.peers_rwnd == 0) &&
3263                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3264                                         SCTP_STAT_INCR(sctps_pdrpdiwnp);
3265                                         return (0);
3266                                 }
3267                                 if (stcb->asoc.peers_rwnd == 0 &&
3268                                     (flg & SCTP_FROM_MIDDLE_BOX)) {
3269                                         SCTP_STAT_INCR(sctps_pdrpdizrw);
3270                                         return (0);
3271                                 }
3272                                 ddp = (uint8_t *) (mtod(tp1->data, caddr_t)+
3273                                     sizeof(struct sctp_data_chunk));
3274                                 {
3275                                         unsigned int iii;
3276
3277                                         for (iii = 0; iii < sizeof(desc->data_bytes);
3278                                             iii++) {
3279                                                 if (ddp[iii] != desc->data_bytes[iii]) {
3280                                                         SCTP_STAT_INCR(sctps_pdrpbadd);
3281                                                         return (-1);
3282                                                 }
3283                                         }
3284                                 }
3285
3286                                 if (tp1->do_rtt) {
3287                                         /*
3288                                          * this guy had a RTO calculation
3289                                          * pending on it, cancel it
3290                                          */
3291                                         if (tp1->whoTo->rto_needed == 0) {
3292                                                 tp1->whoTo->rto_needed = 1;
3293                                         }
3294                                         tp1->do_rtt = 0;
3295                                 }
3296                                 SCTP_STAT_INCR(sctps_pdrpmark);
3297                                 if (tp1->sent != SCTP_DATAGRAM_RESEND)
3298                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3299                                 /*
3300                                  * mark it as if we were doing a FR, since
3301                                  * we will be getting gap ack reports behind
3302                                  * the info from the router.
3303                                  */
3304                                 tp1->rec.data.doing_fast_retransmit = 1;
3305                                 /*
3306                                  * mark the tsn with what sequences can
3307                                  * cause a new FR.
3308                                  */
3309                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) {
3310                                         tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
3311                                 } else {
3312                                         tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq;
3313                                 }
3314
3315                                 /* restart the timer */
3316                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3317                                     stcb, tp1->whoTo,
3318                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_26);
3319                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3320                                     stcb, tp1->whoTo);
3321
3322                                 /* fix counts and things */
3323                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
3324                                         sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP,
3325                                             tp1->whoTo->flight_size,
3326                                             tp1->book_size,
3327                                             (uintptr_t) stcb,
3328                                             tp1->rec.data.TSN_seq);
3329                                 }
3330                                 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
3331                                         sctp_flight_size_decrease(tp1);
3332                                         sctp_total_flight_decrease(stcb, tp1);
3333                                 }
3334                                 tp1->sent = SCTP_DATAGRAM_RESEND;
3335                         } {
3336                                 /* audit code */
3337                                 unsigned int audit;
3338
3339                                 audit = 0;
3340                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3341                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3342                                                 audit++;
3343                                 }
3344                                 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue,
3345                                     sctp_next) {
3346                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3347                                                 audit++;
3348                                 }
3349                                 if (audit != stcb->asoc.sent_queue_retran_cnt) {
3350                                         SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n",
3351                                             audit, stcb->asoc.sent_queue_retran_cnt);
3352 #ifndef SCTP_AUDITING_ENABLED
3353                                         stcb->asoc.sent_queue_retran_cnt = audit;
3354 #endif
3355                                 }
3356                         }
3357                 }
3358                 break;
3359         case SCTP_ASCONF:
3360                 {
3361                         struct sctp_tmit_chunk *asconf;
3362
3363                         TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue,
3364                             sctp_next) {
3365                                 if (asconf->rec.chunk_id.id == SCTP_ASCONF) {
3366                                         break;
3367                                 }
3368                         }
3369                         if (asconf) {
3370                                 if (asconf->sent != SCTP_DATAGRAM_RESEND)
3371                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3372                                 asconf->sent = SCTP_DATAGRAM_RESEND;
3373                                 asconf->snd_count--;
3374                         }
3375                 }
3376                 break;
3377         case SCTP_INITIATION:
3378                 /* resend the INIT */
3379                 stcb->asoc.dropped_special_cnt++;
3380                 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) {
3381                         /*
3382                          * If we can get it in, in a few attempts we do
3383                          * this, otherwise we let the timer fire.
3384                          */
3385                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep,
3386                             stcb, net,
3387                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_27);
3388                         sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
3389                 }
3390                 break;
3391         case SCTP_SELECTIVE_ACK:
3392         case SCTP_NR_SELECTIVE_ACK:
3393                 /* resend the sack */
3394                 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED);
3395                 break;
3396         case SCTP_HEARTBEAT_REQUEST:
3397                 /* resend a demand HB */
3398                 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) {
3399                         /*
3400                          * Only retransmit if we KNOW we wont destroy the
3401                          * tcb
3402                          */
3403                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
3404                 }
3405                 break;
3406         case SCTP_SHUTDOWN:
3407                 sctp_send_shutdown(stcb, net);
3408                 break;
3409         case SCTP_SHUTDOWN_ACK:
3410                 sctp_send_shutdown_ack(stcb, net);
3411                 break;
3412         case SCTP_COOKIE_ECHO:
3413                 {
3414                         struct sctp_tmit_chunk *cookie;
3415
3416                         cookie = NULL;
3417                         TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue,
3418                             sctp_next) {
3419                                 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
3420                                         break;
3421                                 }
3422                         }
3423                         if (cookie) {
3424                                 if (cookie->sent != SCTP_DATAGRAM_RESEND)
3425                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3426                                 cookie->sent = SCTP_DATAGRAM_RESEND;
3427                                 sctp_stop_all_cookie_timers(stcb);
3428                         }
3429                 }
3430                 break;
3431         case SCTP_COOKIE_ACK:
3432                 sctp_send_cookie_ack(stcb);
3433                 break;
3434         case SCTP_ASCONF_ACK:
3435                 /* resend last asconf ack */
3436                 sctp_send_asconf_ack(stcb);
3437                 break;
3438         case SCTP_FORWARD_CUM_TSN:
3439                 send_forward_tsn(stcb, &stcb->asoc);
3440                 break;
3441                 /* can't do anything with these */
3442         case SCTP_PACKET_DROPPED:
3443         case SCTP_INITIATION_ACK:       /* this should not happen */
3444         case SCTP_HEARTBEAT_ACK:
3445         case SCTP_ABORT_ASSOCIATION:
3446         case SCTP_OPERATION_ERROR:
3447         case SCTP_SHUTDOWN_COMPLETE:
3448         case SCTP_ECN_ECHO:
3449         case SCTP_ECN_CWR:
3450         default:
3451                 break;
3452         }
3453         return (0);
3454 }
3455
3456 void
3457 sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list)
3458 {
3459         uint32_t i;
3460         uint16_t temp;
3461
3462         /*
3463          * We set things to 0xffff since this is the last delivered sequence
3464          * and we will be sending in 0 after the reset.
3465          */
3466
3467         if (number_entries) {
3468                 for (i = 0; i < number_entries; i++) {
3469                         temp = ntohs(list[i]);
3470                         if (temp >= stcb->asoc.streamincnt) {
3471                                 continue;
3472                         }
3473                         stcb->asoc.strmin[temp].last_sequence_delivered = 0xffff;
3474                 }
3475         } else {
3476                 list = NULL;
3477                 for (i = 0; i < stcb->asoc.streamincnt; i++) {
3478                         stcb->asoc.strmin[i].last_sequence_delivered = 0xffff;
3479                 }
3480         }
3481         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3482 }
3483
3484 static void
3485 sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list)
3486 {
3487         uint32_t i;
3488         uint16_t temp;
3489
3490         if (number_entries > 0) {
3491                 for (i = 0; i < number_entries; i++) {
3492                         temp = ntohs(list[i]);
3493                         if (temp >= stcb->asoc.streamoutcnt) {
3494                                 /* no such stream */
3495                                 continue;
3496                         }
3497                         stcb->asoc.strmout[temp].next_sequence_send = 0;
3498                 }
3499         } else {
3500                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3501                         stcb->asoc.strmout[i].next_sequence_send = 0;
3502                 }
3503         }
3504         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3505 }
3506
3507
3508 struct sctp_stream_reset_request *
3509 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk)
3510 {
3511         struct sctp_association *asoc;
3512         struct sctp_chunkhdr *ch;
3513         struct sctp_stream_reset_request *r;
3514         struct sctp_tmit_chunk *chk;
3515         int len, clen;
3516
3517         asoc = &stcb->asoc;
3518         if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
3519                 asoc->stream_reset_outstanding = 0;
3520                 return (NULL);
3521         }
3522         if (stcb->asoc.str_reset == NULL) {
3523                 asoc->stream_reset_outstanding = 0;
3524                 return (NULL);
3525         }
3526         chk = stcb->asoc.str_reset;
3527         if (chk->data == NULL) {
3528                 return (NULL);
3529         }
3530         if (bchk) {
3531                 /* he wants a copy of the chk pointer */
3532                 *bchk = chk;
3533         }
3534         clen = chk->send_size;
3535         ch = mtod(chk->data, struct sctp_chunkhdr *);
3536         r = (struct sctp_stream_reset_request *)(ch + 1);
3537         if (ntohl(r->request_seq) == seq) {
3538                 /* found it */
3539                 return (r);
3540         }
3541         len = SCTP_SIZE32(ntohs(r->ph.param_length));
3542         if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) {
3543                 /* move to the next one, there can only be a max of two */
3544                 r = (struct sctp_stream_reset_request *)((caddr_t)r + len);
3545                 if (ntohl(r->request_seq) == seq) {
3546                         return (r);
3547                 }
3548         }
3549         /* that seq is not here */
3550         return (NULL);
3551 }
3552
3553 static void
3554 sctp_clean_up_stream_reset(struct sctp_tcb *stcb)
3555 {
3556         struct sctp_association *asoc;
3557         struct sctp_tmit_chunk *chk = stcb->asoc.str_reset;
3558
3559         if (stcb->asoc.str_reset == NULL) {
3560                 return;
3561         }
3562         asoc = &stcb->asoc;
3563
3564         sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb,
3565             chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_28);
3566         TAILQ_REMOVE(&asoc->control_send_queue,
3567             chk,
3568             sctp_next);
3569         if (chk->data) {
3570                 sctp_m_freem(chk->data);
3571                 chk->data = NULL;
3572         }
3573         asoc->ctrl_queue_cnt--;
3574         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3575         /* sa_ignore NO_NULL_CHK */
3576         stcb->asoc.str_reset = NULL;
3577 }
3578
3579
3580 static int
3581 sctp_handle_stream_reset_response(struct sctp_tcb *stcb,
3582     uint32_t seq, uint32_t action,
3583     struct sctp_stream_reset_response *respin)
3584 {
3585         uint16_t type;
3586         int lparm_len;
3587         struct sctp_association *asoc = &stcb->asoc;
3588         struct sctp_tmit_chunk *chk;
3589         struct sctp_stream_reset_request *req_param;
3590         struct sctp_stream_reset_out_request *req_out_param;
3591         struct sctp_stream_reset_in_request *req_in_param;
3592         uint32_t number_entries;
3593
3594         if (asoc->stream_reset_outstanding == 0) {
3595                 /* duplicate */
3596                 return (0);
3597         }
3598         if (seq == stcb->asoc.str_reset_seq_out) {
3599                 req_param = sctp_find_stream_reset(stcb, seq, &chk);
3600                 if (req_param != NULL) {
3601                         stcb->asoc.str_reset_seq_out++;
3602                         type = ntohs(req_param->ph.param_type);
3603                         lparm_len = ntohs(req_param->ph.param_length);
3604                         if (type == SCTP_STR_RESET_OUT_REQUEST) {
3605                                 req_out_param = (struct sctp_stream_reset_out_request *)req_param;
3606                                 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t);
3607                                 asoc->stream_reset_out_is_outstanding = 0;
3608                                 if (asoc->stream_reset_outstanding)
3609                                         asoc->stream_reset_outstanding--;
3610                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3611                                         /* do it */
3612                                         sctp_reset_out_streams(stcb, number_entries, req_out_param->list_of_streams);
3613                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3614                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3615                                 } else {
3616                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3617                                 }
3618                         } else if (type == SCTP_STR_RESET_IN_REQUEST) {
3619                                 req_in_param = (struct sctp_stream_reset_in_request *)req_param;
3620                                 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t);
3621                                 if (asoc->stream_reset_outstanding)
3622                                         asoc->stream_reset_outstanding--;
3623                                 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3624                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb,
3625                                             number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3626                                 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3627                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb,
3628                                             number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3629                                 }
3630                         } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) {
3631                                 /* Ok we now may have more streams */
3632                                 int num_stream;
3633
3634                                 num_stream = stcb->asoc.strm_pending_add_size;
3635                                 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) {
3636                                         /* TSNH */
3637                                         num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt;
3638                                 }
3639                                 stcb->asoc.strm_pending_add_size = 0;
3640                                 if (asoc->stream_reset_outstanding)
3641                                         asoc->stream_reset_outstanding--;
3642                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3643                                         /* Put the new streams into effect */
3644                                         stcb->asoc.streamoutcnt += num_stream;
3645                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
3646                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3647                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3648                                             SCTP_STREAM_CHANGE_DENIED);
3649                                 } else {
3650                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3651                                             SCTP_STREAM_CHANGE_FAILED);
3652                                 }
3653                         } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) {
3654                                 if (asoc->stream_reset_outstanding)
3655                                         asoc->stream_reset_outstanding--;
3656                                 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3657                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3658                                             SCTP_STREAM_CHANGE_DENIED);
3659                                 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3660                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3661                                             SCTP_STREAM_CHANGE_FAILED);
3662                                 }
3663                         } else if (type == SCTP_STR_RESET_TSN_REQUEST) {
3664                                 /**
3665                                  * a) Adopt the new in tsn.
3666                                  * b) reset the map
3667                                  * c) Adopt the new out-tsn
3668                                  */
3669                                 struct sctp_stream_reset_response_tsn *resp;
3670                                 struct sctp_forward_tsn_chunk fwdtsn;
3671                                 int abort_flag = 0;
3672
3673                                 if (respin == NULL) {
3674                                         /* huh ? */
3675                                         return (0);
3676                                 }
3677                                 if (ntohs(respin->ph.param_length) < sizeof(struct sctp_stream_reset_response_tsn)) {
3678                                         return (0);
3679                                 }
3680                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3681                                         resp = (struct sctp_stream_reset_response_tsn *)respin;
3682                                         asoc->stream_reset_outstanding--;
3683                                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3684                                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3685                                         fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1);
3686                                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3687                                         if (abort_flag) {
3688                                                 return (1);
3689                                         }
3690                                         stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1);
3691                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3692                                                 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3693                                         }
3694                                         stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map;
3695                                         stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn);
3696                                         memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size);
3697
3698                                         stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map;
3699                                         memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size);
3700
3701                                         stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn);
3702                                         stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn;
3703
3704                                         sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL);
3705                                         sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL);
3706                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0);
3707                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3708                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
3709                                             SCTP_ASSOC_RESET_DENIED);
3710                                 } else {
3711                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
3712                                             SCTP_ASSOC_RESET_FAILED);
3713                                 }
3714                         }
3715                         /* get rid of the request and get the request flags */
3716                         if (asoc->stream_reset_outstanding == 0) {
3717                                 sctp_clean_up_stream_reset(stcb);
3718                         }
3719                 }
3720         }
3721         return (0);
3722 }
3723
3724 static void
3725 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb,
3726     struct sctp_tmit_chunk *chk,
3727     struct sctp_stream_reset_in_request *req, int trunc)
3728 {
3729         uint32_t seq;
3730         int len, i;
3731         int number_entries;
3732         uint16_t temp;
3733
3734         /*
3735          * peer wants me to send a str-reset to him for my outgoing seq's if
3736          * seq_in is right.
3737          */
3738         struct sctp_association *asoc = &stcb->asoc;
3739
3740         seq = ntohl(req->request_seq);
3741         if (asoc->str_reset_seq_in == seq) {
3742                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3743                 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
3744                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3745                 } else if (trunc) {
3746                         /* Can't do it, since they exceeded our buffer size  */
3747                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3748                 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) {
3749                         len = ntohs(req->ph.param_length);
3750                         number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t));
3751                         for (i = 0; i < number_entries; i++) {
3752                                 temp = ntohs(req->list_of_streams[i]);
3753                                 req->list_of_streams[i] = temp;
3754                         }
3755                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3756                         sctp_add_stream_reset_out(chk, number_entries, req->list_of_streams,
3757                             asoc->str_reset_seq_out,
3758                             seq, (asoc->sending_seq - 1));
3759                         asoc->stream_reset_out_is_outstanding = 1;
3760                         asoc->str_reset = chk;
3761                         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
3762                         stcb->asoc.stream_reset_outstanding++;
3763                 } else {
3764                         /* Can't do it, since we have sent one out */
3765                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
3766                 }
3767                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3768                 asoc->str_reset_seq_in++;
3769         } else if (asoc->str_reset_seq_in - 1 == seq) {
3770                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3771         } else if (asoc->str_reset_seq_in - 2 == seq) {
3772                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3773         } else {
3774                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3775         }
3776 }
3777
3778 static int
3779 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb,
3780     struct sctp_tmit_chunk *chk,
3781     struct sctp_stream_reset_tsn_request *req)
3782 {
3783         /* reset all in and out and update the tsn */
3784         /*
3785          * A) reset my str-seq's on in and out. B) Select a receive next,
3786          * and set cum-ack to it. Also process this selected number as a
3787          * fwd-tsn as well. C) set in the response my next sending seq.
3788          */
3789         struct sctp_forward_tsn_chunk fwdtsn;
3790         struct sctp_association *asoc = &stcb->asoc;
3791         int abort_flag = 0;
3792         uint32_t seq;
3793
3794         seq = ntohl(req->request_seq);
3795         if (asoc->str_reset_seq_in == seq) {
3796                 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0];
3797                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
3798                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3799                 } else {
3800                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3801                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3802                         fwdtsn.ch.chunk_flags = 0;
3803                         fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1);
3804                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3805                         if (abort_flag) {
3806                                 return (1);
3807                         }
3808                         asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA;
3809                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3810                                 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3811                         }
3812                         asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map;
3813                         asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1;
3814                         memset(asoc->mapping_array, 0, asoc->mapping_array_size);
3815                         asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
3816                         memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size);
3817                         atomic_add_int(&asoc->sending_seq, 1);
3818                         /* save off historical data for retrans */
3819                         asoc->last_sending_seq[1] = asoc->last_sending_seq[0];
3820                         asoc->last_sending_seq[0] = asoc->sending_seq;
3821                         asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0];
3822                         asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn;
3823                         sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL);
3824                         sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL);
3825                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3826                         sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0);
3827                 }
3828                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3829                     asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
3830                 asoc->str_reset_seq_in++;
3831         } else if (asoc->str_reset_seq_in - 1 == seq) {
3832                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3833                     asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
3834         } else if (asoc->str_reset_seq_in - 2 == seq) {
3835                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1],
3836                     asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]);
3837         } else {
3838                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3839         }
3840         return (0);
3841 }
3842
3843 static void
3844 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb,
3845     struct sctp_tmit_chunk *chk,
3846     struct sctp_stream_reset_out_request *req, int trunc)
3847 {
3848         uint32_t seq, tsn;
3849         int number_entries, len;
3850         struct sctp_association *asoc = &stcb->asoc;
3851
3852         seq = ntohl(req->request_seq);
3853
3854         /* now if its not a duplicate we process it */
3855         if (asoc->str_reset_seq_in == seq) {
3856                 len = ntohs(req->ph.param_length);
3857                 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t));
3858                 /*
3859                  * the sender is resetting, handle the list issue.. we must
3860                  * a) verify if we can do the reset, if so no problem b) If
3861                  * we can't do the reset we must copy the request. c) queue
3862                  * it, and setup the data in processor to trigger it off
3863                  * when needed and dequeue all the queued data.
3864                  */
3865                 tsn = ntohl(req->send_reset_at_tsn);
3866
3867                 /* move the reset action back one */
3868                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3869                 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
3870                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3871                 } else if (trunc) {
3872                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3873                 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) {
3874                         /* we can do it now */
3875                         sctp_reset_in_stream(stcb, number_entries, req->list_of_streams);
3876                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3877                 } else {
3878                         /*
3879                          * we must queue it up and thus wait for the TSN's
3880                          * to arrive that are at or before tsn
3881                          */
3882                         struct sctp_stream_reset_list *liste;
3883                         int siz;
3884
3885                         siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t));
3886                         SCTP_MALLOC(liste, struct sctp_stream_reset_list *,
3887                             siz, SCTP_M_STRESET);
3888                         if (liste == NULL) {
3889                                 /* gak out of memory */
3890                                 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3891                                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3892                                 return;
3893                         }
3894                         liste->tsn = tsn;
3895                         liste->number_entries = number_entries;
3896                         memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t));
3897                         TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp);
3898                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3899                 }
3900                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3901                 asoc->str_reset_seq_in++;
3902         } else if ((asoc->str_reset_seq_in - 1) == seq) {
3903                 /*
3904                  * one seq back, just echo back last action since my
3905                  * response was lost.
3906                  */
3907                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3908         } else if ((asoc->str_reset_seq_in - 2) == seq) {
3909                 /*
3910                  * two seq back, just echo back last action since my
3911                  * response was lost.
3912                  */
3913                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3914         } else {
3915                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3916         }
3917 }
3918
3919 static void
3920 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
3921     struct sctp_stream_reset_add_strm *str_add)
3922 {
3923         /*
3924          * Peer is requesting to add more streams. If its within our
3925          * max-streams we will allow it.
3926          */
3927         uint32_t num_stream, i;
3928         uint32_t seq;
3929         struct sctp_association *asoc = &stcb->asoc;
3930         struct sctp_queued_to_read *ctl, *nctl;
3931
3932         /* Get the number. */
3933         seq = ntohl(str_add->request_seq);
3934         num_stream = ntohs(str_add->number_of_streams);
3935         /* Now what would be the new total? */
3936         if (asoc->str_reset_seq_in == seq) {
3937                 num_stream += stcb->asoc.streamincnt;
3938                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
3939                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
3940                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3941                 } else if ((num_stream > stcb->asoc.max_inbound_streams) ||
3942                     (num_stream > 0xffff)) {
3943                         /* We must reject it they ask for to many */
3944         denied:
3945                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3946                 } else {
3947                         /* Ok, we can do that :-) */
3948                         struct sctp_stream_in *oldstrm;
3949
3950                         /* save off the old */
3951                         oldstrm = stcb->asoc.strmin;
3952                         SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *,
3953                             (num_stream * sizeof(struct sctp_stream_in)),
3954                             SCTP_M_STRMI);
3955                         if (stcb->asoc.strmin == NULL) {
3956                                 stcb->asoc.strmin = oldstrm;
3957                                 goto denied;
3958                         }
3959                         /* copy off the old data */
3960                         for (i = 0; i < stcb->asoc.streamincnt; i++) {
3961                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
3962                                 stcb->asoc.strmin[i].stream_no = i;
3963                                 stcb->asoc.strmin[i].last_sequence_delivered = oldstrm[i].last_sequence_delivered;
3964                                 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started;
3965                                 /* now anything on those queues? */
3966                                 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next, nctl) {
3967                                         TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next);
3968                                         TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next);
3969                                 }
3970                         }
3971                         /* Init the new streams */
3972                         for (i = stcb->asoc.streamincnt; i < num_stream; i++) {
3973                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
3974                                 stcb->asoc.strmin[i].stream_no = i;
3975                                 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff;
3976                                 stcb->asoc.strmin[i].delivery_started = 0;
3977                         }
3978                         SCTP_FREE(oldstrm, SCTP_M_STRMI);
3979                         /* update the size */
3980                         stcb->asoc.streamincnt = num_stream;
3981                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3982                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
3983                 }
3984                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3985                 asoc->str_reset_seq_in++;
3986         } else if ((asoc->str_reset_seq_in - 1) == seq) {
3987                 /*
3988                  * one seq back, just echo back last action since my
3989                  * response was lost.
3990                  */
3991                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3992         } else if ((asoc->str_reset_seq_in - 2) == seq) {
3993                 /*
3994                  * two seq back, just echo back last action since my
3995                  * response was lost.
3996                  */
3997                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3998         } else {
3999                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
4000
4001         }
4002 }
4003
4004 static void
4005 sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
4006     struct sctp_stream_reset_add_strm *str_add)
4007 {
4008         /*
4009          * Peer is requesting to add more streams. If its within our
4010          * max-streams we will allow it.
4011          */
4012         uint16_t num_stream;
4013         uint32_t seq;
4014         struct sctp_association *asoc = &stcb->asoc;
4015
4016         /* Get the number. */
4017         seq = ntohl(str_add->request_seq);
4018         num_stream = ntohs(str_add->number_of_streams);
4019         /* Now what would be the new total? */
4020         if (asoc->str_reset_seq_in == seq) {
4021                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
4022                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
4023                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4024                 } else if (stcb->asoc.stream_reset_outstanding) {
4025                         /* We must reject it we have something pending */
4026                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
4027                 } else {
4028                         /* Ok, we can do that :-) */
4029                         int mychk;
4030
4031                         mychk = stcb->asoc.streamoutcnt;
4032                         mychk += num_stream;
4033                         if (mychk < 0x10000) {
4034                                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
4035                                 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 0, 1, num_stream, 0, 1)) {
4036                                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4037                                 }
4038                         } else {
4039                                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4040                         }
4041                 }
4042                 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]);
4043                 asoc->str_reset_seq_in++;
4044         } else if ((asoc->str_reset_seq_in - 1) == seq) {
4045                 /*
4046                  * one seq back, just echo back last action since my
4047                  * response was lost.
4048                  */
4049                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4050         } else if ((asoc->str_reset_seq_in - 2) == seq) {
4051                 /*
4052                  * two seq back, just echo back last action since my
4053                  * response was lost.
4054                  */
4055                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
4056         } else {
4057                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
4058         }
4059 }
4060
4061 #ifdef __GNUC__
4062 __attribute__((noinline))
4063 #endif
4064         static int
4065             sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset,
4066         struct sctp_chunkhdr *ch_req)
4067 {
4068         uint16_t remaining_length, param_len, ptype;
4069         struct sctp_paramhdr pstore;
4070         uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE];
4071         uint32_t seq = 0;
4072         int num_req = 0;
4073         int trunc = 0;
4074         struct sctp_tmit_chunk *chk;
4075         struct sctp_chunkhdr *ch;
4076         struct sctp_paramhdr *ph;
4077         int ret_code = 0;
4078         int num_param = 0;
4079
4080         /* now it may be a reset or a reset-response */
4081         remaining_length = ntohs(ch_req->chunk_length) - sizeof(struct sctp_chunkhdr);
4082
4083         /* setup for adding the response */
4084         sctp_alloc_a_chunk(stcb, chk);
4085         if (chk == NULL) {
4086                 return (ret_code);
4087         }
4088         chk->copy_by_ref = 0;
4089         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
4090         chk->rec.chunk_id.can_take_data = 0;
4091         chk->flags = 0;
4092         chk->asoc = &stcb->asoc;
4093         chk->no_fr_allowed = 0;
4094         chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr);
4095         chk->book_size_scale = 0;
4096         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
4097         if (chk->data == NULL) {
4098 strres_nochunk:
4099                 if (chk->data) {
4100                         sctp_m_freem(chk->data);
4101                         chk->data = NULL;
4102                 }
4103                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
4104                 return (ret_code);
4105         }
4106         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
4107
4108         /* setup chunk parameters */
4109         chk->sent = SCTP_DATAGRAM_UNSENT;
4110         chk->snd_count = 0;
4111         chk->whoTo = NULL;
4112
4113         ch = mtod(chk->data, struct sctp_chunkhdr *);
4114         ch->chunk_type = SCTP_STREAM_RESET;
4115         ch->chunk_flags = 0;
4116         ch->chunk_length = htons(chk->send_size);
4117         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
4118         offset += sizeof(struct sctp_chunkhdr);
4119         while (remaining_length >= sizeof(struct sctp_paramhdr)) {
4120                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *) & pstore);
4121                 if (ph == NULL) {
4122                         /* TSNH */
4123                         break;
4124                 }
4125                 param_len = ntohs(ph->param_length);
4126                 if ((param_len > remaining_length) ||
4127                     (param_len < (sizeof(struct sctp_paramhdr) + sizeof(uint32_t)))) {
4128                         /* bad parameter length */
4129                         break;
4130                 }
4131                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, sizeof(cstore)),
4132                     (uint8_t *) & cstore);
4133                 if (ph == NULL) {
4134                         /* TSNH */
4135                         break;
4136                 }
4137                 ptype = ntohs(ph->param_type);
4138                 num_param++;
4139                 if (param_len > sizeof(cstore)) {
4140                         trunc = 1;
4141                 } else {
4142                         trunc = 0;
4143                 }
4144                 if (num_param > SCTP_MAX_RESET_PARAMS) {
4145                         /* hit the max of parameters already sorry.. */
4146                         break;
4147                 }
4148                 if (ptype == SCTP_STR_RESET_OUT_REQUEST) {
4149                         struct sctp_stream_reset_out_request *req_out;
4150
4151                         if (param_len < sizeof(struct sctp_stream_reset_out_request)) {
4152                                 break;
4153                         }
4154                         req_out = (struct sctp_stream_reset_out_request *)ph;
4155                         num_req++;
4156                         if (stcb->asoc.stream_reset_outstanding) {
4157                                 seq = ntohl(req_out->response_seq);
4158                                 if (seq == stcb->asoc.str_reset_seq_out) {
4159                                         /* implicit ack */
4160                                         (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL);
4161                                 }
4162                         }
4163                         sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc);
4164                 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) {
4165                         struct sctp_stream_reset_add_strm *str_add;
4166
4167                         if (param_len < sizeof(struct sctp_stream_reset_add_strm)) {
4168                                 break;
4169                         }
4170                         str_add = (struct sctp_stream_reset_add_strm *)ph;
4171                         num_req++;
4172                         sctp_handle_str_reset_add_strm(stcb, chk, str_add);
4173                 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) {
4174                         struct sctp_stream_reset_add_strm *str_add;
4175
4176                         if (param_len < sizeof(struct sctp_stream_reset_add_strm)) {
4177                                 break;
4178                         }
4179                         str_add = (struct sctp_stream_reset_add_strm *)ph;
4180                         num_req++;
4181                         sctp_handle_str_reset_add_out_strm(stcb, chk, str_add);
4182                 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) {
4183                         struct sctp_stream_reset_in_request *req_in;
4184
4185                         num_req++;
4186                         req_in = (struct sctp_stream_reset_in_request *)ph;
4187                         sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc);
4188                 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) {
4189                         struct sctp_stream_reset_tsn_request *req_tsn;
4190
4191                         num_req++;
4192                         req_tsn = (struct sctp_stream_reset_tsn_request *)ph;
4193                         if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) {
4194                                 ret_code = 1;
4195                                 goto strres_nochunk;
4196                         }
4197                         /* no more */
4198                         break;
4199                 } else if (ptype == SCTP_STR_RESET_RESPONSE) {
4200                         struct sctp_stream_reset_response *resp;
4201                         uint32_t result;
4202
4203                         if (param_len < sizeof(struct sctp_stream_reset_response)) {
4204                                 break;
4205                         }
4206                         resp = (struct sctp_stream_reset_response *)ph;
4207                         seq = ntohl(resp->response_seq);
4208                         result = ntohl(resp->result);
4209                         if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) {
4210                                 ret_code = 1;
4211                                 goto strres_nochunk;
4212                         }
4213                 } else {
4214                         break;
4215                 }
4216                 offset += SCTP_SIZE32(param_len);
4217                 if (remaining_length >= SCTP_SIZE32(param_len)) {
4218                         remaining_length -= SCTP_SIZE32(param_len);
4219                 } else {
4220                         remaining_length = 0;
4221                 }
4222         }
4223         if (num_req == 0) {
4224                 /* we have no response free the stuff */
4225                 goto strres_nochunk;
4226         }
4227         /* ok we have a chunk to link in */
4228         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue,
4229             chk,
4230             sctp_next);
4231         stcb->asoc.ctrl_queue_cnt++;
4232         return (ret_code);
4233 }
4234
4235 /*
4236  * Handle a router or endpoints report of a packet loss, there are two ways
4237  * to handle this, either we get the whole packet and must disect it
4238  * ourselves (possibly with truncation and or corruption) or it is a summary
4239  * from a middle box that did the disectting for us.
4240  */
4241 static void
4242 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp,
4243     struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit)
4244 {
4245         uint32_t bottle_bw, on_queue;
4246         uint16_t trunc_len;
4247         unsigned int chlen;
4248         unsigned int at;
4249         struct sctp_chunk_desc desc;
4250         struct sctp_chunkhdr *ch;
4251
4252         chlen = ntohs(cp->ch.chunk_length);
4253         chlen -= sizeof(struct sctp_pktdrop_chunk);
4254         /* XXX possible chlen underflow */
4255         if (chlen == 0) {
4256                 ch = NULL;
4257                 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)
4258                         SCTP_STAT_INCR(sctps_pdrpbwrpt);
4259         } else {
4260                 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr));
4261                 chlen -= sizeof(struct sctphdr);
4262                 /* XXX possible chlen underflow */
4263                 memset(&desc, 0, sizeof(desc));
4264         }
4265         trunc_len = (uint16_t) ntohs(cp->trunc_len);
4266         if (trunc_len > limit) {
4267                 trunc_len = limit;
4268         }
4269         /* now the chunks themselves */
4270         while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) {
4271                 desc.chunk_type = ch->chunk_type;
4272                 /* get amount we need to move */
4273                 at = ntohs(ch->chunk_length);
4274                 if (at < sizeof(struct sctp_chunkhdr)) {
4275                         /* corrupt chunk, maybe at the end? */
4276                         SCTP_STAT_INCR(sctps_pdrpcrupt);
4277                         break;
4278                 }
4279                 if (trunc_len == 0) {
4280                         /* we are supposed to have all of it */
4281                         if (at > chlen) {
4282                                 /* corrupt skip it */
4283                                 SCTP_STAT_INCR(sctps_pdrpcrupt);
4284                                 break;
4285                         }
4286                 } else {
4287                         /* is there enough of it left ? */
4288                         if (desc.chunk_type == SCTP_DATA) {
4289                                 if (chlen < (sizeof(struct sctp_data_chunk) +
4290                                     sizeof(desc.data_bytes))) {
4291                                         break;
4292                                 }
4293                         } else {
4294                                 if (chlen < sizeof(struct sctp_chunkhdr)) {
4295                                         break;
4296                                 }
4297                         }
4298                 }
4299                 if (desc.chunk_type == SCTP_DATA) {
4300                         /* can we get out the tsn? */
4301                         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
4302                                 SCTP_STAT_INCR(sctps_pdrpmbda);
4303
4304                         if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) {
4305                                 /* yep */
4306                                 struct sctp_data_chunk *dcp;
4307                                 uint8_t *ddp;
4308                                 unsigned int iii;
4309
4310                                 dcp = (struct sctp_data_chunk *)ch;
4311                                 ddp = (uint8_t *) (dcp + 1);
4312                                 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) {
4313                                         desc.data_bytes[iii] = ddp[iii];
4314                                 }
4315                                 desc.tsn_ifany = dcp->dp.tsn;
4316                         } else {
4317                                 /* nope we are done. */
4318                                 SCTP_STAT_INCR(sctps_pdrpnedat);
4319                                 break;
4320                         }
4321                 } else {
4322                         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
4323                                 SCTP_STAT_INCR(sctps_pdrpmbct);
4324                 }
4325
4326                 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) {
4327                         SCTP_STAT_INCR(sctps_pdrppdbrk);
4328                         break;
4329                 }
4330                 if (SCTP_SIZE32(at) > chlen) {
4331                         break;
4332                 }
4333                 chlen -= SCTP_SIZE32(at);
4334                 if (chlen < sizeof(struct sctp_chunkhdr)) {
4335                         /* done, none left */
4336                         break;
4337                 }
4338                 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at));
4339         }
4340         /* Now update any rwnd --- possibly */
4341         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) {
4342                 /* From a peer, we get a rwnd report */
4343                 uint32_t a_rwnd;
4344
4345                 SCTP_STAT_INCR(sctps_pdrpfehos);
4346
4347                 bottle_bw = ntohl(cp->bottle_bw);
4348                 on_queue = ntohl(cp->current_onq);
4349                 if (bottle_bw && on_queue) {
4350                         /* a rwnd report is in here */
4351                         if (bottle_bw > on_queue)
4352                                 a_rwnd = bottle_bw - on_queue;
4353                         else
4354                                 a_rwnd = 0;
4355
4356                         if (a_rwnd == 0)
4357                                 stcb->asoc.peers_rwnd = 0;
4358                         else {
4359                                 if (a_rwnd > stcb->asoc.total_flight) {
4360                                         stcb->asoc.peers_rwnd =
4361                                             a_rwnd - stcb->asoc.total_flight;
4362                                 } else {
4363                                         stcb->asoc.peers_rwnd = 0;
4364                                 }
4365                                 if (stcb->asoc.peers_rwnd <
4366                                     stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
4367                                         /* SWS sender side engages */
4368                                         stcb->asoc.peers_rwnd = 0;
4369                                 }
4370                         }
4371                 }
4372         } else {
4373                 SCTP_STAT_INCR(sctps_pdrpfmbox);
4374         }
4375
4376         /* now middle boxes in sat networks get a cwnd bump */
4377         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) &&
4378             (stcb->asoc.sat_t3_loss_recovery == 0) &&
4379             (stcb->asoc.sat_network)) {
4380                 /*
4381                  * This is debateable but for sat networks it makes sense
4382                  * Note if a T3 timer has went off, we will prohibit any
4383                  * changes to cwnd until we exit the t3 loss recovery.
4384                  */
4385                 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb,
4386                     net, cp, &bottle_bw, &on_queue);
4387         }
4388 }
4389
4390 /*
4391  * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to
4392  * still contain IP/SCTP header - stcb: is the tcb found for this packet -
4393  * offset: offset into the mbuf chain to first chunkhdr - length: is the
4394  * length of the complete packet outputs: - length: modified to remaining
4395  * length after control processing - netp: modified to new sctp_nets after
4396  * cookie-echo processing - return NULL to discard the packet (ie. no asoc,
4397  * bad packet,...) otherwise return the tcb for this packet
4398  */
4399 #ifdef __GNUC__
4400 __attribute__((noinline))
4401 #endif
4402         static struct sctp_tcb *
4403                  sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length,
4404              struct sockaddr *src, struct sockaddr *dst,
4405              struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp,
4406              struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen,
4407              uint8_t mflowtype, uint32_t mflowid,
4408              uint32_t vrf_id, uint16_t port)
4409 {
4410         struct sctp_association *asoc;
4411         struct mbuf *op_err;
4412         char msg[SCTP_DIAG_INFO_LEN];
4413         uint32_t vtag_in;
4414         int num_chunks = 0;     /* number of control chunks processed */
4415         uint32_t chk_length;
4416         int ret;
4417         int abort_no_unlock = 0;
4418         int ecne_seen = 0;
4419
4420         /*
4421          * How big should this be, and should it be alloc'd? Lets try the
4422          * d-mtu-ceiling for now (2k) and that should hopefully work ...
4423          * until we get into jumbo grams and such..
4424          */
4425         uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE];
4426         struct sctp_tcb *locked_tcb = stcb;
4427         int got_auth = 0;
4428         uint32_t auth_offset = 0, auth_len = 0;
4429         int auth_skipped = 0;
4430         int asconf_cnt = 0;
4431
4432 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4433         struct socket *so;
4434
4435 #endif
4436
4437         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n",
4438             iphlen, *offset, length, (void *)stcb);
4439
4440         /* validate chunk header length... */
4441         if (ntohs(ch->chunk_length) < sizeof(*ch)) {
4442                 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n",
4443                     ntohs(ch->chunk_length));
4444                 if (locked_tcb) {
4445                         SCTP_TCB_UNLOCK(locked_tcb);
4446                 }
4447                 return (NULL);
4448         }
4449         /*
4450          * validate the verification tag
4451          */
4452         vtag_in = ntohl(sh->v_tag);
4453
4454         if (locked_tcb) {
4455                 SCTP_TCB_LOCK_ASSERT(locked_tcb);
4456         }
4457         if (ch->chunk_type == SCTP_INITIATION) {
4458                 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n",
4459                     ntohs(ch->chunk_length), vtag_in);
4460                 if (vtag_in != 0) {
4461                         /* protocol error- silently discard... */
4462                         SCTP_STAT_INCR(sctps_badvtag);
4463                         if (locked_tcb) {
4464                                 SCTP_TCB_UNLOCK(locked_tcb);
4465                         }
4466                         return (NULL);
4467                 }
4468         } else if (ch->chunk_type != SCTP_COOKIE_ECHO) {
4469                 /*
4470                  * If there is no stcb, skip the AUTH chunk and process
4471                  * later after a stcb is found (to validate the lookup was
4472                  * valid.
4473                  */
4474                 if ((ch->chunk_type == SCTP_AUTHENTICATION) &&
4475                     (stcb == NULL) &&
4476                     (inp->auth_supported == 1)) {
4477                         /* save this chunk for later processing */
4478                         auth_skipped = 1;
4479                         auth_offset = *offset;
4480                         auth_len = ntohs(ch->chunk_length);
4481
4482                         /* (temporarily) move past this chunk */
4483                         *offset += SCTP_SIZE32(auth_len);
4484                         if (*offset >= length) {
4485                                 /* no more data left in the mbuf chain */
4486                                 *offset = length;
4487                                 if (locked_tcb) {
4488                                         SCTP_TCB_UNLOCK(locked_tcb);
4489                                 }
4490                                 return (NULL);
4491                         }
4492                         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4493                             sizeof(struct sctp_chunkhdr), chunk_buf);
4494                 }
4495                 if (ch == NULL) {
4496                         /* Help */
4497                         *offset = length;
4498                         if (locked_tcb) {
4499                                 SCTP_TCB_UNLOCK(locked_tcb);
4500                         }
4501                         return (NULL);
4502                 }
4503                 if (ch->chunk_type == SCTP_COOKIE_ECHO) {
4504                         goto process_control_chunks;
4505                 }
4506                 /*
4507                  * first check if it's an ASCONF with an unknown src addr we
4508                  * need to look inside to find the association
4509                  */
4510                 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) {
4511                         struct sctp_chunkhdr *asconf_ch = ch;
4512                         uint32_t asconf_offset = 0, asconf_len = 0;
4513
4514                         /* inp's refcount may be reduced */
4515                         SCTP_INP_INCR_REF(inp);
4516
4517                         asconf_offset = *offset;
4518                         do {
4519                                 asconf_len = ntohs(asconf_ch->chunk_length);
4520                                 if (asconf_len < sizeof(struct sctp_asconf_paramhdr))
4521                                         break;
4522                                 stcb = sctp_findassociation_ep_asconf(m,
4523                                     *offset,
4524                                     dst,
4525                                     sh, &inp, netp, vrf_id);
4526                                 if (stcb != NULL)
4527                                         break;
4528                                 asconf_offset += SCTP_SIZE32(asconf_len);
4529                                 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset,
4530                                     sizeof(struct sctp_chunkhdr), chunk_buf);
4531                         } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF);
4532                         if (stcb == NULL) {
4533                                 /*
4534                                  * reduce inp's refcount if not reduced in
4535                                  * sctp_findassociation_ep_asconf().
4536                                  */
4537                                 SCTP_INP_DECR_REF(inp);
4538                         } else {
4539                                 locked_tcb = stcb;
4540                         }
4541
4542                         /* now go back and verify any auth chunk to be sure */
4543                         if (auth_skipped && (stcb != NULL)) {
4544                                 struct sctp_auth_chunk *auth;
4545
4546                                 auth = (struct sctp_auth_chunk *)
4547                                     sctp_m_getptr(m, auth_offset,
4548                                     auth_len, chunk_buf);
4549                                 got_auth = 1;
4550                                 auth_skipped = 0;
4551                                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m,
4552                                     auth_offset)) {
4553                                         /* auth HMAC failed so dump it */
4554                                         *offset = length;
4555                                         if (locked_tcb) {
4556                                                 SCTP_TCB_UNLOCK(locked_tcb);
4557                                         }
4558                                         return (NULL);
4559                                 } else {
4560                                         /* remaining chunks are HMAC checked */
4561                                         stcb->asoc.authenticated = 1;
4562                                 }
4563                         }
4564                 }
4565                 if (stcb == NULL) {
4566                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__);
4567                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
4568                             msg);
4569                         /* no association, so it's out of the blue... */
4570                         sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, op_err,
4571                             mflowtype, mflowid,
4572                             vrf_id, port);
4573                         *offset = length;
4574                         if (locked_tcb) {
4575                                 SCTP_TCB_UNLOCK(locked_tcb);
4576                         }
4577                         return (NULL);
4578                 }
4579                 asoc = &stcb->asoc;
4580                 /* ABORT and SHUTDOWN can use either v_tag... */
4581                 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) ||
4582                     (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) ||
4583                     (ch->chunk_type == SCTP_PACKET_DROPPED)) {
4584                         /* Take the T-bit always into account. */
4585                         if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) &&
4586                             (vtag_in == asoc->my_vtag)) ||
4587                             (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) &&
4588                             (vtag_in == asoc->peer_vtag))) {
4589                                 /* this is valid */
4590                         } else {
4591                                 /* drop this packet... */
4592                                 SCTP_STAT_INCR(sctps_badvtag);
4593                                 if (locked_tcb) {
4594                                         SCTP_TCB_UNLOCK(locked_tcb);
4595                                 }
4596                                 return (NULL);
4597                         }
4598                 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
4599                         if (vtag_in != asoc->my_vtag) {
4600                                 /*
4601                                  * this could be a stale SHUTDOWN-ACK or the
4602                                  * peer never got the SHUTDOWN-COMPLETE and
4603                                  * is still hung; we have started a new asoc
4604                                  * but it won't complete until the shutdown
4605                                  * is completed
4606                                  */
4607                                 if (locked_tcb) {
4608                                         SCTP_TCB_UNLOCK(locked_tcb);
4609                                 }
4610                                 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__);
4611                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
4612                                     msg);
4613                                 sctp_handle_ootb(m, iphlen, *offset, src, dst,
4614                                     sh, inp, op_err,
4615                                     mflowtype, mflowid,
4616                                     vrf_id, port);
4617                                 return (NULL);
4618                         }
4619                 } else {
4620                         /* for all other chunks, vtag must match */
4621                         if (vtag_in != asoc->my_vtag) {
4622                                 /* invalid vtag... */
4623                                 SCTPDBG(SCTP_DEBUG_INPUT3,
4624                                     "invalid vtag: %xh, expect %xh\n",
4625                                     vtag_in, asoc->my_vtag);
4626                                 SCTP_STAT_INCR(sctps_badvtag);
4627                                 if (locked_tcb) {
4628                                         SCTP_TCB_UNLOCK(locked_tcb);
4629                                 }
4630                                 *offset = length;
4631                                 return (NULL);
4632                         }
4633                 }
4634         }                       /* end if !SCTP_COOKIE_ECHO */
4635         /*
4636          * process all control chunks...
4637          */
4638         if (((ch->chunk_type == SCTP_SELECTIVE_ACK) ||
4639             (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) ||
4640             (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) &&
4641             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) {
4642                 /* implied cookie-ack.. we must have lost the ack */
4643                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
4644                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
4645                             stcb->asoc.overall_error_count,
4646                             0,
4647                             SCTP_FROM_SCTP_INPUT,
4648                             __LINE__);
4649                 }
4650                 stcb->asoc.overall_error_count = 0;
4651                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb,
4652                     *netp);
4653         }
4654 process_control_chunks:
4655         while (IS_SCTP_CONTROL(ch)) {
4656                 /* validate chunk length */
4657                 chk_length = ntohs(ch->chunk_length);
4658                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n",
4659                     ch->chunk_type, chk_length);
4660                 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length);
4661                 if (chk_length < sizeof(*ch) ||
4662                     (*offset + (int)chk_length) > length) {
4663                         *offset = length;
4664                         if (locked_tcb) {
4665                                 SCTP_TCB_UNLOCK(locked_tcb);
4666                         }
4667                         return (NULL);
4668                 }
4669                 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks);
4670                 /*
4671                  * INIT-ACK only gets the init ack "header" portion only
4672                  * because we don't have to process the peer's COOKIE. All
4673                  * others get a complete chunk.
4674                  */
4675                 if ((ch->chunk_type == SCTP_INITIATION_ACK) ||
4676                     (ch->chunk_type == SCTP_INITIATION)) {
4677                         /* get an init-ack chunk */
4678                         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4679                             sizeof(struct sctp_init_ack_chunk), chunk_buf);
4680                         if (ch == NULL) {
4681                                 *offset = length;
4682                                 if (locked_tcb) {
4683                                         SCTP_TCB_UNLOCK(locked_tcb);
4684                                 }
4685                                 return (NULL);
4686                         }
4687                 } else {
4688                         /* For cookies and all other chunks. */
4689                         if (chk_length > sizeof(chunk_buf)) {
4690                                 /*
4691                                  * use just the size of the chunk buffer so
4692                                  * the front part of our chunks fit in
4693                                  * contiguous space up to the chunk buffer
4694                                  * size (508 bytes). For chunks that need to
4695                                  * get more than that they must use the
4696                                  * sctp_m_getptr() function or other means
4697                                  * (e.g. know how to parse mbuf chains).
4698                                  * Cookies do this already.
4699                                  */
4700                                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4701                                     (sizeof(chunk_buf) - 4),
4702                                     chunk_buf);
4703                                 if (ch == NULL) {
4704                                         *offset = length;
4705                                         if (locked_tcb) {
4706                                                 SCTP_TCB_UNLOCK(locked_tcb);
4707                                         }
4708                                         return (NULL);
4709                                 }
4710                         } else {
4711                                 /* We can fit it all */
4712                                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4713                                     chk_length, chunk_buf);
4714                                 if (ch == NULL) {
4715                                         SCTP_PRINTF("sctp_process_control: Can't get the all data....\n");
4716                                         *offset = length;
4717                                         if (locked_tcb) {
4718                                                 SCTP_TCB_UNLOCK(locked_tcb);
4719                                         }
4720                                         return (NULL);
4721                                 }
4722                         }
4723                 }
4724                 num_chunks++;
4725                 /* Save off the last place we got a control from */
4726                 if (stcb != NULL) {
4727                         if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) {
4728                                 /*
4729                                  * allow last_control to be NULL if
4730                                  * ASCONF... ASCONF processing will find the
4731                                  * right net later
4732                                  */
4733                                 if ((netp != NULL) && (*netp != NULL))
4734                                         stcb->asoc.last_control_chunk_from = *netp;
4735                         }
4736                 }
4737 #ifdef SCTP_AUDITING_ENABLED
4738                 sctp_audit_log(0xB0, ch->chunk_type);
4739 #endif
4740
4741                 /* check to see if this chunk required auth, but isn't */
4742                 if ((stcb != NULL) &&
4743                     (stcb->asoc.auth_supported == 1) &&
4744                     sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) &&
4745                     !stcb->asoc.authenticated) {
4746                         /* "silently" ignore */
4747                         SCTP_STAT_INCR(sctps_recvauthmissing);
4748                         goto next_chunk;
4749                 }
4750                 switch (ch->chunk_type) {
4751                 case SCTP_INITIATION:
4752                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n");
4753                         /* The INIT chunk must be the only chunk. */
4754                         if ((num_chunks > 1) ||
4755                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4756                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
4757                                     "INIT not the only chunk");
4758                                 sctp_abort_association(inp, stcb, m, iphlen,
4759                                     src, dst, sh, op_err,
4760                                     mflowtype, mflowid,
4761                                     vrf_id, port);
4762                                 *offset = length;
4763                                 return (NULL);
4764                         }
4765                         /* Honor our resource limit. */
4766                         if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) {
4767                                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
4768                                 sctp_abort_association(inp, stcb, m, iphlen,
4769                                     src, dst, sh, op_err,
4770                                     mflowtype, mflowid,
4771                                     vrf_id, port);
4772                                 *offset = length;
4773                                 return (NULL);
4774                         }
4775                         sctp_handle_init(m, iphlen, *offset, src, dst, sh,
4776                             (struct sctp_init_chunk *)ch, inp,
4777                             stcb, &abort_no_unlock,
4778                             mflowtype, mflowid,
4779                             vrf_id, port);
4780                         *offset = length;
4781                         if ((!abort_no_unlock) && (locked_tcb)) {
4782                                 SCTP_TCB_UNLOCK(locked_tcb);
4783                         }
4784                         return (NULL);
4785                         break;
4786                 case SCTP_PAD_CHUNK:
4787                         break;
4788                 case SCTP_INITIATION_ACK:
4789                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT-ACK\n");
4790                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4791                                 /* We are not interested anymore */
4792                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
4793                                         ;
4794                                 } else {
4795                                         if (locked_tcb != stcb) {
4796                                                 /* Very unlikely */
4797                                                 SCTP_TCB_UNLOCK(locked_tcb);
4798                                         }
4799                                         *offset = length;
4800                                         if (stcb) {
4801 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4802                                                 so = SCTP_INP_SO(inp);
4803                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4804                                                 SCTP_TCB_UNLOCK(stcb);
4805                                                 SCTP_SOCKET_LOCK(so, 1);
4806                                                 SCTP_TCB_LOCK(stcb);
4807                                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4808 #endif
4809                                                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
4810                                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_29);
4811 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4812                                                 SCTP_SOCKET_UNLOCK(so, 1);
4813 #endif
4814                                         }
4815                                         return (NULL);
4816                                 }
4817                         }
4818                         /* The INIT-ACK chunk must be the only chunk. */
4819                         if ((num_chunks > 1) ||
4820                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4821                                 *offset = length;
4822                                 if (locked_tcb) {
4823                                         SCTP_TCB_UNLOCK(locked_tcb);
4824                                 }
4825                                 return (NULL);
4826                         }
4827                         if ((netp) && (*netp)) {
4828                                 ret = sctp_handle_init_ack(m, iphlen, *offset,
4829                                     src, dst, sh,
4830                                     (struct sctp_init_ack_chunk *)ch,
4831                                     stcb, *netp,
4832                                     &abort_no_unlock,
4833                                     mflowtype, mflowid,
4834                                     vrf_id);
4835                         } else {
4836                                 ret = -1;
4837                         }
4838                         *offset = length;
4839                         if (abort_no_unlock) {
4840                                 return (NULL);
4841                         }
4842                         /*
4843                          * Special case, I must call the output routine to
4844                          * get the cookie echoed
4845                          */
4846                         if ((stcb != NULL) && (ret == 0)) {
4847                                 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
4848                         }
4849                         if (locked_tcb) {
4850                                 SCTP_TCB_UNLOCK(locked_tcb);
4851                         }
4852                         return (NULL);
4853                         break;
4854                 case SCTP_SELECTIVE_ACK:
4855                         {
4856                                 struct sctp_sack_chunk *sack;
4857                                 int abort_now = 0;
4858                                 uint32_t a_rwnd, cum_ack;
4859                                 uint16_t num_seg, num_dup;
4860                                 uint8_t flags;
4861                                 int offset_seg, offset_dup;
4862
4863                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK\n");
4864                                 SCTP_STAT_INCR(sctps_recvsacks);
4865                                 if (stcb == NULL) {
4866                                         SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing SACK chunk\n");
4867                                         break;
4868                                 }
4869                                 if (chk_length < sizeof(struct sctp_sack_chunk)) {
4870                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n");
4871                                         break;
4872                                 }
4873                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
4874                                         /*-
4875                                          * If we have sent a shutdown-ack, we will pay no
4876                                          * attention to a sack sent in to us since
4877                                          * we don't care anymore.
4878                                          */
4879                                         break;
4880                                 }
4881                                 sack = (struct sctp_sack_chunk *)ch;
4882                                 flags = ch->chunk_flags;
4883                                 cum_ack = ntohl(sack->sack.cum_tsn_ack);
4884                                 num_seg = ntohs(sack->sack.num_gap_ack_blks);
4885                                 num_dup = ntohs(sack->sack.num_dup_tsns);
4886                                 a_rwnd = (uint32_t) ntohl(sack->sack.a_rwnd);
4887                                 if (sizeof(struct sctp_sack_chunk) +
4888                                     num_seg * sizeof(struct sctp_gap_ack_block) +
4889                                     num_dup * sizeof(uint32_t) != chk_length) {
4890                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n");
4891                                         break;
4892                                 }
4893                                 offset_seg = *offset + sizeof(struct sctp_sack_chunk);
4894                                 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
4895                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n",
4896                                     cum_ack, num_seg, a_rwnd);
4897                                 stcb->asoc.seen_a_sack_this_pkt = 1;
4898                                 if ((stcb->asoc.pr_sctp_cnt == 0) &&
4899                                     (num_seg == 0) &&
4900                                     SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
4901                                     (stcb->asoc.saw_sack_with_frags == 0) &&
4902                                     (stcb->asoc.saw_sack_with_nr_frags == 0) &&
4903                                     (!TAILQ_EMPTY(&stcb->asoc.sent_queue))
4904                                     ) {
4905                                         /*
4906                                          * We have a SIMPLE sack having no
4907                                          * prior segments and data on sent
4908                                          * queue to be acked.. Use the
4909                                          * faster path sack processing. We
4910                                          * also allow window update sacks
4911                                          * with no missing segments to go
4912                                          * this way too.
4913                                          */
4914                                         sctp_express_handle_sack(stcb, cum_ack, a_rwnd, &abort_now, ecne_seen);
4915                                 } else {
4916                                         if (netp && *netp)
4917                                                 sctp_handle_sack(m, offset_seg, offset_dup, stcb,
4918                                                     num_seg, 0, num_dup, &abort_now, flags,
4919                                                     cum_ack, a_rwnd, ecne_seen);
4920                                 }
4921                                 if (abort_now) {
4922                                         /* ABORT signal from sack processing */
4923                                         *offset = length;
4924                                         return (NULL);
4925                                 }
4926                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
4927                                     TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
4928                                     (stcb->asoc.stream_queue_cnt == 0)) {
4929                                         sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
4930                                 }
4931                         }
4932                         break;
4933                         /*
4934                          * EY - nr_sack:  If the received chunk is an
4935                          * nr_sack chunk
4936                          */
4937                 case SCTP_NR_SELECTIVE_ACK:
4938                         {
4939                                 struct sctp_nr_sack_chunk *nr_sack;
4940                                 int abort_now = 0;
4941                                 uint32_t a_rwnd, cum_ack;
4942                                 uint16_t num_seg, num_nr_seg, num_dup;
4943                                 uint8_t flags;
4944                                 int offset_seg, offset_dup;
4945
4946                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK\n");
4947                                 SCTP_STAT_INCR(sctps_recvsacks);
4948                                 if (stcb == NULL) {
4949                                         SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing NR-SACK chunk\n");
4950                                         break;
4951                                 }
4952                                 if (stcb->asoc.nrsack_supported == 0) {
4953                                         goto unknown_chunk;
4954                                 }
4955                                 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) {
4956                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR-SACK chunk, too small\n");
4957                                         break;
4958                                 }
4959                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
4960                                         /*-
4961                                          * If we have sent a shutdown-ack, we will pay no
4962                                          * attention to a sack sent in to us since
4963                                          * we don't care anymore.
4964                                          */
4965                                         break;
4966                                 }
4967                                 nr_sack = (struct sctp_nr_sack_chunk *)ch;
4968                                 flags = ch->chunk_flags;
4969                                 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack);
4970                                 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks);
4971                                 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks);
4972                                 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns);
4973                                 a_rwnd = (uint32_t) ntohl(nr_sack->nr_sack.a_rwnd);
4974                                 if (sizeof(struct sctp_nr_sack_chunk) +
4975                                     (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) +
4976                                     num_dup * sizeof(uint32_t) != chk_length) {
4977                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n");
4978                                         break;
4979                                 }
4980                                 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk);
4981                                 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
4982                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n",
4983                                     cum_ack, num_seg, a_rwnd);
4984                                 stcb->asoc.seen_a_sack_this_pkt = 1;
4985                                 if ((stcb->asoc.pr_sctp_cnt == 0) &&
4986                                     (num_seg == 0) && (num_nr_seg == 0) &&
4987                                     SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
4988                                     (stcb->asoc.saw_sack_with_frags == 0) &&
4989                                     (stcb->asoc.saw_sack_with_nr_frags == 0) &&
4990                                     (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
4991                                         /*
4992                                          * We have a SIMPLE sack having no
4993                                          * prior segments and data on sent
4994                                          * queue to be acked. Use the faster
4995                                          * path sack processing. We also
4996                                          * allow window update sacks with no
4997                                          * missing segments to go this way
4998                                          * too.
4999                                          */
5000                                         sctp_express_handle_sack(stcb, cum_ack, a_rwnd,
5001                                             &abort_now, ecne_seen);
5002                                 } else {
5003                                         if (netp && *netp)
5004                                                 sctp_handle_sack(m, offset_seg, offset_dup, stcb,
5005                                                     num_seg, num_nr_seg, num_dup, &abort_now, flags,
5006                                                     cum_ack, a_rwnd, ecne_seen);
5007                                 }
5008                                 if (abort_now) {
5009                                         /* ABORT signal from sack processing */
5010                                         *offset = length;
5011                                         return (NULL);
5012                                 }
5013                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
5014                                     TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
5015                                     (stcb->asoc.stream_queue_cnt == 0)) {
5016                                         sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
5017                                 }
5018                         }
5019                         break;
5020
5021                 case SCTP_HEARTBEAT_REQUEST:
5022                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n");
5023                         if ((stcb) && netp && *netp) {
5024                                 SCTP_STAT_INCR(sctps_recvheartbeat);
5025                                 sctp_send_heartbeat_ack(stcb, m, *offset,
5026                                     chk_length, *netp);
5027
5028                                 /* He's alive so give him credit */
5029                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5030                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5031                                             stcb->asoc.overall_error_count,
5032                                             0,
5033                                             SCTP_FROM_SCTP_INPUT,
5034                                             __LINE__);
5035                                 }
5036                                 stcb->asoc.overall_error_count = 0;
5037                         }
5038                         break;
5039                 case SCTP_HEARTBEAT_ACK:
5040                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT-ACK\n");
5041                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) {
5042                                 /* Its not ours */
5043                                 *offset = length;
5044                                 if (locked_tcb) {
5045                                         SCTP_TCB_UNLOCK(locked_tcb);
5046                                 }
5047                                 return (NULL);
5048                         }
5049                         /* He's alive so give him credit */
5050                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5051                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5052                                     stcb->asoc.overall_error_count,
5053                                     0,
5054                                     SCTP_FROM_SCTP_INPUT,
5055                                     __LINE__);
5056                         }
5057                         stcb->asoc.overall_error_count = 0;
5058                         SCTP_STAT_INCR(sctps_recvheartbeatack);
5059                         if (netp && *netp)
5060                                 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch,
5061                                     stcb, *netp);
5062                         break;
5063                 case SCTP_ABORT_ASSOCIATION:
5064                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n",
5065                             (void *)stcb);
5066                         if ((stcb) && netp && *netp)
5067                                 sctp_handle_abort((struct sctp_abort_chunk *)ch,
5068                                     stcb, *netp);
5069                         *offset = length;
5070                         return (NULL);
5071                         break;
5072                 case SCTP_SHUTDOWN:
5073                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n",
5074                             (void *)stcb);
5075                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) {
5076                                 *offset = length;
5077                                 if (locked_tcb) {
5078                                         SCTP_TCB_UNLOCK(locked_tcb);
5079                                 }
5080                                 return (NULL);
5081                         }
5082                         if (netp && *netp) {
5083                                 int abort_flag = 0;
5084
5085                                 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch,
5086                                     stcb, *netp, &abort_flag);
5087                                 if (abort_flag) {
5088                                         *offset = length;
5089                                         return (NULL);
5090                                 }
5091                         }
5092                         break;
5093                 case SCTP_SHUTDOWN_ACK:
5094                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-ACK, stcb %p\n", (void *)stcb);
5095                         if ((stcb) && (netp) && (*netp))
5096                                 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp);
5097                         *offset = length;
5098                         return (NULL);
5099                         break;
5100
5101                 case SCTP_OPERATION_ERROR:
5102                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP-ERR\n");
5103                         if ((stcb) && netp && *netp && sctp_handle_error(ch, stcb, *netp) < 0) {
5104                                 *offset = length;
5105                                 return (NULL);
5106                         }
5107                         break;
5108                 case SCTP_COOKIE_ECHO:
5109                         SCTPDBG(SCTP_DEBUG_INPUT3,
5110                             "SCTP_COOKIE-ECHO, stcb %p\n", (void *)stcb);
5111                         if ((stcb) && (stcb->asoc.total_output_queue_size)) {
5112                                 ;
5113                         } else {
5114                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5115                                         /* We are not interested anymore */
5116                         abend:
5117                                         if (stcb) {
5118                                                 SCTP_TCB_UNLOCK(stcb);
5119                                         }
5120                                         *offset = length;
5121                                         return (NULL);
5122                                 }
5123                         }
5124                         /*
5125                          * First are we accepting? We do this again here
5126                          * since it is possible that a previous endpoint WAS
5127                          * listening responded to a INIT-ACK and then
5128                          * closed. We opened and bound.. and are now no
5129                          * longer listening.
5130                          */
5131
5132                         if ((stcb == NULL) && (inp->sctp_socket->so_qlen >= inp->sctp_socket->so_qlimit)) {
5133                                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
5134                                     (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) {
5135                                         op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
5136                                         sctp_abort_association(inp, stcb, m, iphlen,
5137                                             src, dst, sh, op_err,
5138                                             mflowtype, mflowid,
5139                                             vrf_id, port);
5140                                 }
5141                                 *offset = length;
5142                                 return (NULL);
5143                         } else {
5144                                 struct mbuf *ret_buf;
5145                                 struct sctp_inpcb *linp;
5146
5147                                 if (stcb) {
5148                                         linp = NULL;
5149                                 } else {
5150                                         linp = inp;
5151                                 }
5152
5153                                 if (linp) {
5154                                         SCTP_ASOC_CREATE_LOCK(linp);
5155                                         if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
5156                                             (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
5157                                                 SCTP_ASOC_CREATE_UNLOCK(linp);
5158                                                 goto abend;
5159                                         }
5160                                 }
5161                                 if (netp) {
5162                                         ret_buf =
5163                                             sctp_handle_cookie_echo(m, iphlen,
5164                                             *offset,
5165                                             src, dst,
5166                                             sh,
5167                                             (struct sctp_cookie_echo_chunk *)ch,
5168                                             &inp, &stcb, netp,
5169                                             auth_skipped,
5170                                             auth_offset,
5171                                             auth_len,
5172                                             &locked_tcb,
5173                                             mflowtype,
5174                                             mflowid,
5175                                             vrf_id,
5176                                             port);
5177                                 } else {
5178                                         ret_buf = NULL;
5179                                 }
5180                                 if (linp) {
5181                                         SCTP_ASOC_CREATE_UNLOCK(linp);
5182                                 }
5183                                 if (ret_buf == NULL) {
5184                                         if (locked_tcb) {
5185                                                 SCTP_TCB_UNLOCK(locked_tcb);
5186                                         }
5187                                         SCTPDBG(SCTP_DEBUG_INPUT3,
5188                                             "GAK, null buffer\n");
5189                                         *offset = length;
5190                                         return (NULL);
5191                                 }
5192                                 /* if AUTH skipped, see if it verified... */
5193                                 if (auth_skipped) {
5194                                         got_auth = 1;
5195                                         auth_skipped = 0;
5196                                 }
5197                                 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) {
5198                                         /*
5199                                          * Restart the timer if we have
5200                                          * pending data
5201                                          */
5202                                         struct sctp_tmit_chunk *chk;
5203
5204                                         chk = TAILQ_FIRST(&stcb->asoc.sent_queue);
5205                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
5206                                 }
5207                         }
5208                         break;
5209                 case SCTP_COOKIE_ACK:
5210                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE-ACK, stcb %p\n", (void *)stcb);
5211                         if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) {
5212                                 if (locked_tcb) {
5213                                         SCTP_TCB_UNLOCK(locked_tcb);
5214                                 }
5215                                 return (NULL);
5216                         }
5217                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5218                                 /* We are not interested anymore */
5219                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
5220                                         ;
5221                                 } else if (stcb) {
5222 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5223                                         so = SCTP_INP_SO(inp);
5224                                         atomic_add_int(&stcb->asoc.refcnt, 1);
5225                                         SCTP_TCB_UNLOCK(stcb);
5226                                         SCTP_SOCKET_LOCK(so, 1);
5227                                         SCTP_TCB_LOCK(stcb);
5228                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
5229 #endif
5230                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
5231                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_30);
5232 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5233                                         SCTP_SOCKET_UNLOCK(so, 1);
5234 #endif
5235                                         *offset = length;
5236                                         return (NULL);
5237                                 }
5238                         }
5239                         /* He's alive so give him credit */
5240                         if ((stcb) && netp && *netp) {
5241                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5242                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5243                                             stcb->asoc.overall_error_count,
5244                                             0,
5245                                             SCTP_FROM_SCTP_INPUT,
5246                                             __LINE__);
5247                                 }
5248                                 stcb->asoc.overall_error_count = 0;
5249                                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp);
5250                         }
5251                         break;
5252                 case SCTP_ECN_ECHO:
5253                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-ECHO\n");
5254                         /* He's alive so give him credit */
5255                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) {
5256                                 /* Its not ours */
5257                                 if (locked_tcb) {
5258                                         SCTP_TCB_UNLOCK(locked_tcb);
5259                                 }
5260                                 *offset = length;
5261                                 return (NULL);
5262                         }
5263                         if (stcb) {
5264                                 if (stcb->asoc.ecn_supported == 0) {
5265                                         goto unknown_chunk;
5266                                 }
5267                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5268                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5269                                             stcb->asoc.overall_error_count,
5270                                             0,
5271                                             SCTP_FROM_SCTP_INPUT,
5272                                             __LINE__);
5273                                 }
5274                                 stcb->asoc.overall_error_count = 0;
5275                                 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch,
5276                                     stcb);
5277                                 ecne_seen = 1;
5278                         }
5279                         break;
5280                 case SCTP_ECN_CWR:
5281                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-CWR\n");
5282                         /* He's alive so give him credit */
5283                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) {
5284                                 /* Its not ours */
5285                                 if (locked_tcb) {
5286                                         SCTP_TCB_UNLOCK(locked_tcb);
5287                                 }
5288                                 *offset = length;
5289                                 return (NULL);
5290                         }
5291                         if (stcb) {
5292                                 if (stcb->asoc.ecn_supported == 0) {
5293                                         goto unknown_chunk;
5294                                 }
5295                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5296                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5297                                             stcb->asoc.overall_error_count,
5298                                             0,
5299                                             SCTP_FROM_SCTP_INPUT,
5300                                             __LINE__);
5301                                 }
5302                                 stcb->asoc.overall_error_count = 0;
5303                                 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp);
5304                         }
5305                         break;
5306                 case SCTP_SHUTDOWN_COMPLETE:
5307                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-COMPLETE, stcb %p\n", (void *)stcb);
5308                         /* must be first and only chunk */
5309                         if ((num_chunks > 1) ||
5310                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
5311                                 *offset = length;
5312                                 if (locked_tcb) {
5313                                         SCTP_TCB_UNLOCK(locked_tcb);
5314                                 }
5315                                 return (NULL);
5316                         }
5317                         if ((stcb) && netp && *netp) {
5318                                 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch,
5319                                     stcb, *netp);
5320                         }
5321                         *offset = length;
5322                         return (NULL);
5323                         break;
5324                 case SCTP_ASCONF:
5325                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n");
5326                         /* He's alive so give him credit */
5327                         if (stcb) {
5328                                 if (stcb->asoc.asconf_supported == 0) {
5329                                         goto unknown_chunk;
5330                                 }
5331                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5332                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5333                                             stcb->asoc.overall_error_count,
5334                                             0,
5335                                             SCTP_FROM_SCTP_INPUT,
5336                                             __LINE__);
5337                                 }
5338                                 stcb->asoc.overall_error_count = 0;
5339                                 sctp_handle_asconf(m, *offset, src,
5340                                     (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0);
5341                                 asconf_cnt++;
5342                         }
5343                         break;
5344                 case SCTP_ASCONF_ACK:
5345                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF-ACK\n");
5346                         if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) {
5347                                 /* Its not ours */
5348                                 if (locked_tcb) {
5349                                         SCTP_TCB_UNLOCK(locked_tcb);
5350                                 }
5351                                 *offset = length;
5352                                 return (NULL);
5353                         }
5354                         if ((stcb) && netp && *netp) {
5355                                 if (stcb->asoc.asconf_supported == 0) {
5356                                         goto unknown_chunk;
5357                                 }
5358                                 /* He's alive so give him credit */
5359                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5360                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5361                                             stcb->asoc.overall_error_count,
5362                                             0,
5363                                             SCTP_FROM_SCTP_INPUT,
5364                                             __LINE__);
5365                                 }
5366                                 stcb->asoc.overall_error_count = 0;
5367                                 sctp_handle_asconf_ack(m, *offset,
5368                                     (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock);
5369                                 if (abort_no_unlock)
5370                                         return (NULL);
5371                         }
5372                         break;
5373                 case SCTP_FORWARD_CUM_TSN:
5374                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD-TSN\n");
5375                         if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) {
5376                                 /* Its not ours */
5377                                 if (locked_tcb) {
5378                                         SCTP_TCB_UNLOCK(locked_tcb);
5379                                 }
5380                                 *offset = length;
5381                                 return (NULL);
5382                         }
5383                         /* He's alive so give him credit */
5384                         if (stcb) {
5385                                 int abort_flag = 0;
5386
5387                                 if (stcb->asoc.prsctp_supported == 0) {
5388                                         goto unknown_chunk;
5389                                 }
5390                                 stcb->asoc.overall_error_count = 0;
5391                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5392                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5393                                             stcb->asoc.overall_error_count,
5394                                             0,
5395                                             SCTP_FROM_SCTP_INPUT,
5396                                             __LINE__);
5397                                 }
5398                                 *fwd_tsn_seen = 1;
5399                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5400                                         /* We are not interested anymore */
5401 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5402                                         so = SCTP_INP_SO(inp);
5403                                         atomic_add_int(&stcb->asoc.refcnt, 1);
5404                                         SCTP_TCB_UNLOCK(stcb);
5405                                         SCTP_SOCKET_LOCK(so, 1);
5406                                         SCTP_TCB_LOCK(stcb);
5407                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
5408 #endif
5409                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
5410                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_31);
5411 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5412                                         SCTP_SOCKET_UNLOCK(so, 1);
5413 #endif
5414                                         *offset = length;
5415                                         return (NULL);
5416                                 }
5417                                 sctp_handle_forward_tsn(stcb,
5418                                     (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset);
5419                                 if (abort_flag) {
5420                                         *offset = length;
5421                                         return (NULL);
5422                                 } else {
5423                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5424                                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5425                                                     stcb->asoc.overall_error_count,
5426                                                     0,
5427                                                     SCTP_FROM_SCTP_INPUT,
5428                                                     __LINE__);
5429                                         }
5430                                         stcb->asoc.overall_error_count = 0;
5431                                 }
5432
5433                         }
5434                         break;
5435                 case SCTP_STREAM_RESET:
5436                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n");
5437                         if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) {
5438                                 /* Its not ours */
5439                                 if (locked_tcb) {
5440                                         SCTP_TCB_UNLOCK(locked_tcb);
5441                                 }
5442                                 *offset = length;
5443                                 return (NULL);
5444                         }
5445                         if (stcb->asoc.reconfig_supported == 0) {
5446                                 goto unknown_chunk;
5447                         }
5448                         if (sctp_handle_stream_reset(stcb, m, *offset, ch)) {
5449                                 /* stop processing */
5450                                 *offset = length;
5451                                 return (NULL);
5452                         }
5453                         break;
5454                 case SCTP_PACKET_DROPPED:
5455                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n");
5456                         /* re-get it all please */
5457                         if (chk_length < sizeof(struct sctp_pktdrop_chunk)) {
5458                                 /* Its not ours */
5459                                 if (locked_tcb) {
5460                                         SCTP_TCB_UNLOCK(locked_tcb);
5461                                 }
5462                                 *offset = length;
5463                                 return (NULL);
5464                         }
5465                         if (ch && (stcb) && netp && (*netp)) {
5466                                 if (stcb->asoc.pktdrop_supported == 0) {
5467                                         goto unknown_chunk;
5468                                 }
5469                                 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch,
5470                                     stcb, *netp,
5471                                     min(chk_length, (sizeof(chunk_buf) - 4)));
5472
5473                         }
5474                         break;
5475                 case SCTP_AUTHENTICATION:
5476                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n");
5477                         if (stcb == NULL) {
5478                                 /* save the first AUTH for later processing */
5479                                 if (auth_skipped == 0) {
5480                                         auth_offset = *offset;
5481                                         auth_len = chk_length;
5482                                         auth_skipped = 1;
5483                                 }
5484                                 /* skip this chunk (temporarily) */
5485                                 goto next_chunk;
5486                         }
5487                         if (stcb->asoc.auth_supported == 0) {
5488                                 goto unknown_chunk;
5489                         }
5490                         if ((chk_length < (sizeof(struct sctp_auth_chunk))) ||
5491                             (chk_length > (sizeof(struct sctp_auth_chunk) +
5492                             SCTP_AUTH_DIGEST_LEN_MAX))) {
5493                                 /* Its not ours */
5494                                 if (locked_tcb) {
5495                                         SCTP_TCB_UNLOCK(locked_tcb);
5496                                 }
5497                                 *offset = length;
5498                                 return (NULL);
5499                         }
5500                         if (got_auth == 1) {
5501                                 /* skip this chunk... it's already auth'd */
5502                                 goto next_chunk;
5503                         }
5504                         got_auth = 1;
5505                         if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch,
5506                             m, *offset)) {
5507                                 /* auth HMAC failed so dump the packet */
5508                                 *offset = length;
5509                                 return (stcb);
5510                         } else {
5511                                 /* remaining chunks are HMAC checked */
5512                                 stcb->asoc.authenticated = 1;
5513                         }
5514                         break;
5515
5516                 default:
5517         unknown_chunk:
5518                         /* it's an unknown chunk! */
5519                         if ((ch->chunk_type & 0x40) && (stcb != NULL)) {
5520                                 struct mbuf *mm;
5521                                 struct sctp_paramhdr *phd;
5522                                 int len;
5523
5524                                 mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
5525                                     0, M_NOWAIT, 1, MT_DATA);
5526                                 if (mm) {
5527                                         len = min(SCTP_SIZE32(chk_length), (uint32_t) (length - *offset));
5528                                         phd = mtod(mm, struct sctp_paramhdr *);
5529                                         /*
5530                                          * We cheat and use param type since
5531                                          * we did not bother to define a
5532                                          * error cause struct. They are the
5533                                          * same basic format with different
5534                                          * names.
5535                                          */
5536                                         phd->param_type = htons(SCTP_CAUSE_UNRECOG_CHUNK);
5537                                         phd->param_length = htons(len + sizeof(*phd));
5538                                         SCTP_BUF_LEN(mm) = sizeof(*phd);
5539                                         SCTP_BUF_NEXT(mm) = SCTP_M_COPYM(m, *offset, len, M_NOWAIT);
5540                                         if (SCTP_BUF_NEXT(mm)) {
5541                                                 if (sctp_pad_lastmbuf(SCTP_BUF_NEXT(mm), SCTP_SIZE32(len) - len, NULL) == NULL) {
5542                                                         sctp_m_freem(mm);
5543                                                 } else {
5544 #ifdef SCTP_MBUF_LOGGING
5545                                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5546                                                                 sctp_log_mbc(SCTP_BUF_NEXT(mm), SCTP_MBUF_ICOPY);
5547                                                         }
5548 #endif
5549                                                         sctp_queue_op_err(stcb, mm);
5550                                                 }
5551                                         } else {
5552                                                 sctp_m_freem(mm);
5553                                         }
5554                                 }
5555                         }
5556                         if ((ch->chunk_type & 0x80) == 0) {
5557                                 /* discard this packet */
5558                                 *offset = length;
5559                                 return (stcb);
5560                         }       /* else skip this bad chunk and continue... */
5561                         break;
5562                 }               /* switch (ch->chunk_type) */
5563
5564
5565 next_chunk:
5566                 /* get the next chunk */
5567                 *offset += SCTP_SIZE32(chk_length);
5568                 if (*offset >= length) {
5569                         /* no more data left in the mbuf chain */
5570                         break;
5571                 }
5572                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
5573                     sizeof(struct sctp_chunkhdr), chunk_buf);
5574                 if (ch == NULL) {
5575                         if (locked_tcb) {
5576                                 SCTP_TCB_UNLOCK(locked_tcb);
5577                         }
5578                         *offset = length;
5579                         return (NULL);
5580                 }
5581         }                       /* while */
5582
5583         if (asconf_cnt > 0 && stcb != NULL) {
5584                 sctp_send_asconf_ack(stcb);
5585         }
5586         return (stcb);
5587 }
5588
5589
5590 #ifdef INVARIANTS
5591 #ifdef __GNUC__
5592 __attribute__((noinline))
5593 #endif
5594         void
5595              sctp_validate_no_locks(struct sctp_inpcb *inp)
5596 {
5597         struct sctp_tcb *lstcb;
5598
5599         LIST_FOREACH(lstcb, &inp->sctp_asoc_list, sctp_tcblist) {
5600                 if (mtx_owned(&lstcb->tcb_mtx)) {
5601                         panic("Own lock on stcb at return from input");
5602                 }
5603         }
5604         if (mtx_owned(&inp->inp_create_mtx)) {
5605                 panic("Own create lock on inp");
5606         }
5607         if (mtx_owned(&inp->inp_mtx)) {
5608                 panic("Own inp lock on inp");
5609         }
5610 }
5611
5612 #endif
5613
5614 /*
5615  * common input chunk processing (v4 and v6)
5616  */
5617 void
5618 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length,
5619     struct sockaddr *src, struct sockaddr *dst,
5620     struct sctphdr *sh, struct sctp_chunkhdr *ch,
5621 #if !defined(SCTP_WITH_NO_CSUM)
5622     uint8_t compute_crc,
5623 #endif
5624     uint8_t ecn_bits,
5625     uint8_t mflowtype, uint32_t mflowid,
5626     uint32_t vrf_id, uint16_t port)
5627 {
5628         uint32_t high_tsn;
5629         int fwd_tsn_seen = 0, data_processed = 0;
5630         struct mbuf *m = *mm, *op_err;
5631         char msg[SCTP_DIAG_INFO_LEN];
5632         int un_sent;
5633         int cnt_ctrl_ready = 0;
5634         struct sctp_inpcb *inp = NULL, *inp_decr = NULL;
5635         struct sctp_tcb *stcb = NULL;
5636         struct sctp_nets *net = NULL;
5637
5638         SCTP_STAT_INCR(sctps_recvdatagrams);
5639 #ifdef SCTP_AUDITING_ENABLED
5640         sctp_audit_log(0xE0, 1);
5641         sctp_auditing(0, inp, stcb, net);
5642 #endif
5643 #if !defined(SCTP_WITH_NO_CSUM)
5644         if (compute_crc != 0) {
5645                 uint32_t check, calc_check;
5646
5647                 check = sh->checksum;
5648                 sh->checksum = 0;
5649                 calc_check = sctp_calculate_cksum(m, iphlen);
5650                 sh->checksum = check;
5651                 if (calc_check != check) {
5652                         SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x  m:%p mlen:%d iphlen:%d\n",
5653                             calc_check, check, (void *)m, length, iphlen);
5654                         stcb = sctp_findassociation_addr(m, offset, src, dst,
5655                             sh, ch, &inp, &net, vrf_id);
5656 #if defined(INET) || defined(INET6)
5657                         if ((net != NULL) && (port != 0)) {
5658                                 if (net->port == 0) {
5659                                         sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr));
5660                                 }
5661                                 net->port = port;
5662                         }
5663 #endif
5664                         if ((net != NULL) && (mflowtype != M_HASHTYPE_NONE)) {
5665                                 net->flowtype = mflowtype;
5666                         }
5667                         if ((inp != NULL) && (stcb != NULL)) {
5668                                 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1);
5669                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED);
5670                         } else if ((inp != NULL) && (stcb == NULL)) {
5671                                 inp_decr = inp;
5672                         }
5673                         SCTP_STAT_INCR(sctps_badsum);
5674                         SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors);
5675                         goto out;
5676                 }
5677         }
5678 #endif
5679         /* Destination port of 0 is illegal, based on RFC4960. */
5680         if (sh->dest_port == 0) {
5681                 SCTP_STAT_INCR(sctps_hdrops);
5682                 goto out;
5683         }
5684         stcb = sctp_findassociation_addr(m, offset, src, dst,
5685             sh, ch, &inp, &net, vrf_id);
5686 #if defined(INET) || defined(INET6)
5687         if ((net != NULL) && (port != 0)) {
5688                 if (net->port == 0) {
5689                         sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr));
5690                 }
5691                 net->port = port;
5692         }
5693 #endif
5694         if ((net != NULL) && (mflowtype != M_HASHTYPE_NONE)) {
5695                 net->flowtype = mflowtype;
5696         }
5697         if (inp == NULL) {
5698                 SCTP_STAT_INCR(sctps_noport);
5699                 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) {
5700                         goto out;
5701                 }
5702                 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
5703                         sctp_send_shutdown_complete2(src, dst, sh,
5704                             mflowtype, mflowid,
5705                             vrf_id, port);
5706                         goto out;
5707                 }
5708                 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) {
5709                         goto out;
5710                 }
5711                 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) {
5712                         if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) ||
5713                             ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) &&
5714                             (ch->chunk_type != SCTP_INIT))) {
5715                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5716                                     "Out of the blue");
5717                                 sctp_send_abort(m, iphlen, src, dst,
5718                                     sh, 0, op_err,
5719                                     mflowtype, mflowid,
5720                                     vrf_id, port);
5721                         }
5722                 }
5723                 goto out;
5724         } else if (stcb == NULL) {
5725                 inp_decr = inp;
5726         }
5727 #ifdef IPSEC
5728         /*-
5729          * I very much doubt any of the IPSEC stuff will work but I have no
5730          * idea, so I will leave it in place.
5731          */
5732         if (inp != NULL) {
5733                 switch (dst->sa_family) {
5734 #ifdef INET
5735                 case AF_INET:
5736                         if (ipsec4_in_reject(m, &inp->ip_inp.inp)) {
5737                                 SCTP_STAT_INCR(sctps_hdrops);
5738                                 goto out;
5739                         }
5740                         break;
5741 #endif
5742 #ifdef INET6
5743                 case AF_INET6:
5744                         if (ipsec6_in_reject(m, &inp->ip_inp.inp)) {
5745                                 SCTP_STAT_INCR(sctps_hdrops);
5746                                 goto out;
5747                         }
5748                         break;
5749 #endif
5750                 default:
5751                         break;
5752                 }
5753         }
5754 #endif
5755         SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n",
5756             (void *)m, iphlen, offset, length, (void *)stcb);
5757         if (stcb) {
5758                 /* always clear this before beginning a packet */
5759                 stcb->asoc.authenticated = 0;
5760                 stcb->asoc.seen_a_sack_this_pkt = 0;
5761                 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n",
5762                     (void *)stcb, stcb->asoc.state);
5763
5764                 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) ||
5765                     (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) {
5766                         /*-
5767                          * If we hit here, we had a ref count
5768                          * up when the assoc was aborted and the
5769                          * timer is clearing out the assoc, we should
5770                          * NOT respond to any packet.. its OOTB.
5771                          */
5772                         SCTP_TCB_UNLOCK(stcb);
5773                         stcb = NULL;
5774                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__);
5775                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5776                             msg);
5777                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5778                             mflowtype, mflowid,
5779                             vrf_id, port);
5780                         goto out;
5781                 }
5782         }
5783         if (IS_SCTP_CONTROL(ch)) {
5784                 /* process the control portion of the SCTP packet */
5785                 /* sa_ignore NO_NULL_CHK */
5786                 stcb = sctp_process_control(m, iphlen, &offset, length,
5787                     src, dst, sh, ch,
5788                     inp, stcb, &net, &fwd_tsn_seen,
5789                     mflowtype, mflowid,
5790                     vrf_id, port);
5791                 if (stcb) {
5792                         /*
5793                          * This covers us if the cookie-echo was there and
5794                          * it changes our INP.
5795                          */
5796                         inp = stcb->sctp_ep;
5797 #if defined(INET) || defined(INET6)
5798                         if ((net) && (port)) {
5799                                 if (net->port == 0) {
5800                                         sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr));
5801                                 }
5802                                 net->port = port;
5803                         }
5804 #endif
5805                 }
5806         } else {
5807                 /*
5808                  * no control chunks, so pre-process DATA chunks (these
5809                  * checks are taken care of by control processing)
5810                  */
5811
5812                 /*
5813                  * if DATA only packet, and auth is required, then punt...
5814                  * can't have authenticated without any AUTH (control)
5815                  * chunks
5816                  */
5817                 if ((stcb != NULL) &&
5818                     (stcb->asoc.auth_supported == 1) &&
5819                     sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) {
5820                         /* "silently" ignore */
5821                         SCTP_STAT_INCR(sctps_recvauthmissing);
5822                         goto out;
5823                 }
5824                 if (stcb == NULL) {
5825                         /* out of the blue DATA chunk */
5826                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__);
5827                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5828                             msg);
5829                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5830                             mflowtype, mflowid,
5831                             vrf_id, port);
5832                         goto out;
5833                 }
5834                 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) {
5835                         /* v_tag mismatch! */
5836                         SCTP_STAT_INCR(sctps_badvtag);
5837                         goto out;
5838                 }
5839         }
5840
5841         if (stcb == NULL) {
5842                 /*
5843                  * no valid TCB for this packet, or we found it's a bad
5844                  * packet while processing control, or we're done with this
5845                  * packet (done or skip rest of data), so we drop it...
5846                  */
5847                 goto out;
5848         }
5849         /*
5850          * DATA chunk processing
5851          */
5852         /* plow through the data chunks while length > offset */
5853
5854         /*
5855          * Rest should be DATA only.  Check authentication state if AUTH for
5856          * DATA is required.
5857          */
5858         if ((length > offset) &&
5859             (stcb != NULL) &&
5860             (stcb->asoc.auth_supported == 1) &&
5861             sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) &&
5862             !stcb->asoc.authenticated) {
5863                 /* "silently" ignore */
5864                 SCTP_STAT_INCR(sctps_recvauthmissing);
5865                 SCTPDBG(SCTP_DEBUG_AUTH1,
5866                     "Data chunk requires AUTH, skipped\n");
5867                 goto trigger_send;
5868         }
5869         if (length > offset) {
5870                 int retval;
5871
5872                 /*
5873                  * First check to make sure our state is correct. We would
5874                  * not get here unless we really did have a tag, so we don't
5875                  * abort if this happens, just dump the chunk silently.
5876                  */
5877                 switch (SCTP_GET_STATE(&stcb->asoc)) {
5878                 case SCTP_STATE_COOKIE_ECHOED:
5879                         /*
5880                          * we consider data with valid tags in this state
5881                          * shows us the cookie-ack was lost. Imply it was
5882                          * there.
5883                          */
5884                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5885                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5886                                     stcb->asoc.overall_error_count,
5887                                     0,
5888                                     SCTP_FROM_SCTP_INPUT,
5889                                     __LINE__);
5890                         }
5891                         stcb->asoc.overall_error_count = 0;
5892                         sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net);
5893                         break;
5894                 case SCTP_STATE_COOKIE_WAIT:
5895                         /*
5896                          * We consider OOTB any data sent during asoc setup.
5897                          */
5898                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__);
5899                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5900                             msg);
5901                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5902                             mflowtype, mflowid,
5903                             vrf_id, port);
5904                         goto out;
5905                         /* sa_ignore NOTREACHED */
5906                         break;
5907                 case SCTP_STATE_EMPTY:  /* should not happen */
5908                 case SCTP_STATE_INUSE:  /* should not happen */
5909                 case SCTP_STATE_SHUTDOWN_RECEIVED:      /* This is a peer error */
5910                 case SCTP_STATE_SHUTDOWN_ACK_SENT:
5911                 default:
5912                         goto out;
5913                         /* sa_ignore NOTREACHED */
5914                         break;
5915                 case SCTP_STATE_OPEN:
5916                 case SCTP_STATE_SHUTDOWN_SENT:
5917                         break;
5918                 }
5919                 /* plow through the data chunks while length > offset */
5920                 retval = sctp_process_data(mm, iphlen, &offset, length,
5921                     src, dst, sh,
5922                     inp, stcb, net, &high_tsn,
5923                     mflowtype, mflowid,
5924                     vrf_id, port);
5925                 if (retval == 2) {
5926                         /*
5927                          * The association aborted, NO UNLOCK needed since
5928                          * the association is destroyed.
5929                          */
5930                         stcb = NULL;
5931                         goto out;
5932                 }
5933                 data_processed = 1;
5934                 /*
5935                  * Anything important needs to have been m_copy'ed in
5936                  * process_data
5937                  */
5938         }
5939         /* take care of ecn */
5940         if ((data_processed == 1) &&
5941             (stcb->asoc.ecn_supported == 1) &&
5942             ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) {
5943                 /* Yep, we need to add a ECNE */
5944                 sctp_send_ecn_echo(stcb, net, high_tsn);
5945         }
5946         if ((data_processed == 0) && (fwd_tsn_seen)) {
5947                 int was_a_gap;
5948                 uint32_t highest_tsn;
5949
5950                 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) {
5951                         highest_tsn = stcb->asoc.highest_tsn_inside_nr_map;
5952                 } else {
5953                         highest_tsn = stcb->asoc.highest_tsn_inside_map;
5954                 }
5955                 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn);
5956                 stcb->asoc.send_sack = 1;
5957                 sctp_sack_check(stcb, was_a_gap);
5958         } else if (fwd_tsn_seen) {
5959                 stcb->asoc.send_sack = 1;
5960         }
5961         /* trigger send of any chunks in queue... */
5962 trigger_send:
5963 #ifdef SCTP_AUDITING_ENABLED
5964         sctp_audit_log(0xE0, 2);
5965         sctp_auditing(1, inp, stcb, net);
5966 #endif
5967         SCTPDBG(SCTP_DEBUG_INPUT1,
5968             "Check for chunk output prw:%d tqe:%d tf=%d\n",
5969             stcb->asoc.peers_rwnd,
5970             TAILQ_EMPTY(&stcb->asoc.control_send_queue),
5971             stcb->asoc.total_flight);
5972         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
5973         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
5974                 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq;
5975         }
5976         if (cnt_ctrl_ready ||
5977             ((un_sent) &&
5978             (stcb->asoc.peers_rwnd > 0 ||
5979             (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) {
5980                 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n");
5981                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
5982                 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n");
5983         }
5984 #ifdef SCTP_AUDITING_ENABLED
5985         sctp_audit_log(0xE0, 3);
5986         sctp_auditing(2, inp, stcb, net);
5987 #endif
5988 out:
5989         if (stcb != NULL) {
5990                 SCTP_TCB_UNLOCK(stcb);
5991         }
5992         if (inp_decr != NULL) {
5993                 /* reduce ref-count */
5994                 SCTP_INP_WLOCK(inp_decr);
5995                 SCTP_INP_DECR_REF(inp_decr);
5996                 SCTP_INP_WUNLOCK(inp_decr);
5997         }
5998 #ifdef INVARIANTS
5999         if (inp != NULL) {
6000                 sctp_validate_no_locks(inp);
6001         }
6002 #endif
6003         return;
6004 }
6005
6006 #ifdef INET
6007 void
6008 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port)
6009 {
6010         struct mbuf *m;
6011         int iphlen;
6012         uint32_t vrf_id = 0;
6013         uint8_t ecn_bits;
6014         struct sockaddr_in src, dst;
6015         struct ip *ip;
6016         struct sctphdr *sh;
6017         struct sctp_chunkhdr *ch;
6018         int length, offset;
6019
6020 #if !defined(SCTP_WITH_NO_CSUM)
6021         uint8_t compute_crc;
6022
6023 #endif
6024         uint32_t mflowid;
6025         uint8_t mflowtype;
6026
6027         iphlen = off;
6028         if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) {
6029                 SCTP_RELEASE_PKT(i_pak);
6030                 return;
6031         }
6032         m = SCTP_HEADER_TO_CHAIN(i_pak);
6033 #ifdef SCTP_MBUF_LOGGING
6034         /* Log in any input mbufs */
6035         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6036                 sctp_log_mbc(m, SCTP_MBUF_INPUT);
6037         }
6038 #endif
6039 #ifdef SCTP_PACKET_LOGGING
6040         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
6041                 sctp_packet_log(m);
6042         }
6043 #endif
6044         SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
6045             "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n",
6046             m->m_pkthdr.len,
6047             if_name(m->m_pkthdr.rcvif),
6048             (int)m->m_pkthdr.csum_flags, CSUM_BITS);
6049         mflowid = m->m_pkthdr.flowid;
6050         mflowtype = M_HASHTYPE_GET(m);
6051         SCTP_STAT_INCR(sctps_recvpackets);
6052         SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
6053         /* Get IP, SCTP, and first chunk header together in the first mbuf. */
6054         offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
6055         if (SCTP_BUF_LEN(m) < offset) {
6056                 if ((m = m_pullup(m, offset)) == NULL) {
6057                         SCTP_STAT_INCR(sctps_hdrops);
6058                         return;
6059                 }
6060         }
6061         ip = mtod(m, struct ip *);
6062         sh = (struct sctphdr *)((caddr_t)ip + iphlen);
6063         ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr));
6064         offset -= sizeof(struct sctp_chunkhdr);
6065         memset(&src, 0, sizeof(struct sockaddr_in));
6066         src.sin_family = AF_INET;
6067         src.sin_len = sizeof(struct sockaddr_in);
6068         src.sin_port = sh->src_port;
6069         src.sin_addr = ip->ip_src;
6070         memset(&dst, 0, sizeof(struct sockaddr_in));
6071         dst.sin_family = AF_INET;
6072         dst.sin_len = sizeof(struct sockaddr_in);
6073         dst.sin_port = sh->dest_port;
6074         dst.sin_addr = ip->ip_dst;
6075         length = ntohs(ip->ip_len);
6076         /* Validate mbuf chain length with IP payload length. */
6077         if (SCTP_HEADER_LEN(m) != length) {
6078                 SCTPDBG(SCTP_DEBUG_INPUT1,
6079                     "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m));
6080                 SCTP_STAT_INCR(sctps_hdrops);
6081                 goto out;
6082         }
6083         /* SCTP does not allow broadcasts or multicasts */
6084         if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) {
6085                 goto out;
6086         }
6087         if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) {
6088                 goto out;
6089         }
6090         ecn_bits = ip->ip_tos;
6091 #if defined(SCTP_WITH_NO_CSUM)
6092         SCTP_STAT_INCR(sctps_recvnocrc);
6093 #else
6094         if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
6095                 SCTP_STAT_INCR(sctps_recvhwcrc);
6096                 compute_crc = 0;
6097         } else {
6098                 SCTP_STAT_INCR(sctps_recvswcrc);
6099                 compute_crc = 1;
6100         }
6101 #endif
6102         sctp_common_input_processing(&m, iphlen, offset, length,
6103             (struct sockaddr *)&src,
6104             (struct sockaddr *)&dst,
6105             sh, ch,
6106 #if !defined(SCTP_WITH_NO_CSUM)
6107             compute_crc,
6108 #endif
6109             ecn_bits,
6110             mflowtype, mflowid,
6111             vrf_id, port);
6112 out:
6113         if (m) {
6114                 sctp_m_freem(m);
6115         }
6116         return;
6117 }
6118
6119 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
6120 extern int *sctp_cpuarry;
6121
6122 #endif
6123
6124 int
6125 sctp_input(struct mbuf **mp, int *offp, int proto SCTP_UNUSED)
6126 {
6127         struct mbuf *m;
6128         int off;
6129
6130         m = *mp;
6131         off = *offp;
6132 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
6133         if (mp_ncpus > 1) {
6134                 struct ip *ip;
6135                 struct sctphdr *sh;
6136                 int offset;
6137                 int cpu_to_use;
6138                 uint32_t flowid, tag;
6139
6140                 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) {
6141                         flowid = m->m_pkthdr.flowid;
6142                 } else {
6143                         /*
6144                          * No flow id built by lower layers fix it so we
6145                          * create one.
6146                          */
6147                         offset = off + sizeof(struct sctphdr);
6148                         if (SCTP_BUF_LEN(m) < offset) {
6149                                 if ((m = m_pullup(m, offset)) == NULL) {
6150                                         SCTP_STAT_INCR(sctps_hdrops);
6151                                         return (IPPROTO_DONE);
6152                                 }
6153                         }
6154                         ip = mtod(m, struct ip *);
6155                         sh = (struct sctphdr *)((caddr_t)ip + off);
6156                         tag = htonl(sh->v_tag);
6157                         flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port);
6158                         m->m_pkthdr.flowid = flowid;
6159                         M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE);
6160                 }
6161                 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus];
6162                 sctp_queue_to_mcore(m, off, cpu_to_use);
6163                 return (IPPROTO_DONE);
6164         }
6165 #endif
6166         sctp_input_with_port(m, off, 0);
6167         return (IPPROTO_DONE);
6168 }
6169
6170 #endif